1 /* PowerPC64-specific support for 64-bit ELF. 2 Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 3 2009, 2010, 2011, 2012 Free Software Foundation, Inc. 4 Written by Linus Nordberg, Swox AB <info@swox.com>, 5 based on elf32-ppc.c by Ian Lance Taylor. 6 Largely rewritten by Alan Modra. 7 8 This file is part of BFD, the Binary File Descriptor library. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License along 21 with this program; if not, write to the Free Software Foundation, Inc., 22 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 23 24 25 /* The 64-bit PowerPC ELF ABI may be found at 26 http://www.linuxbase.org/spec/ELF/ppc64/PPC-elf64abi.txt, and 27 http://www.linuxbase.org/spec/ELF/ppc64/spec/book1.html */ 28 29 #include "sysdep.h" 30 #include <stdarg.h> 31 #include "bfd.h" 32 #include "bfdlink.h" 33 #include "libbfd.h" 34 #include "elf-bfd.h" 35 #include "elf/ppc64.h" 36 #include "elf64-ppc.h" 37 #include "dwarf2.h" 38 39 static bfd_reloc_status_type ppc64_elf_ha_reloc 40 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 41 static bfd_reloc_status_type ppc64_elf_branch_reloc 42 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 43 static bfd_reloc_status_type ppc64_elf_brtaken_reloc 44 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 45 static bfd_reloc_status_type ppc64_elf_sectoff_reloc 46 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 47 static bfd_reloc_status_type ppc64_elf_sectoff_ha_reloc 48 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 49 static bfd_reloc_status_type ppc64_elf_toc_reloc 50 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 51 static bfd_reloc_status_type ppc64_elf_toc_ha_reloc 52 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 53 static bfd_reloc_status_type ppc64_elf_toc64_reloc 54 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 55 static bfd_reloc_status_type ppc64_elf_unhandled_reloc 56 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 57 static bfd_vma opd_entry_value 58 (asection *, bfd_vma, asection **, bfd_vma *, bfd_boolean); 59 60 #define TARGET_LITTLE_SYM bfd_elf64_powerpcle_vec 61 #define TARGET_LITTLE_NAME "elf64-powerpcle" 62 #define TARGET_BIG_SYM bfd_elf64_powerpc_vec 63 #define TARGET_BIG_NAME "elf64-powerpc" 64 #define ELF_ARCH bfd_arch_powerpc 65 #define ELF_TARGET_ID PPC64_ELF_DATA 66 #define ELF_MACHINE_CODE EM_PPC64 67 #define ELF_MAXPAGESIZE 0x10000 68 #define ELF_COMMONPAGESIZE 0x1000 69 #define elf_info_to_howto ppc64_elf_info_to_howto 70 71 #define elf_backend_want_got_sym 0 72 #define elf_backend_want_plt_sym 0 73 #define elf_backend_plt_alignment 3 74 #define elf_backend_plt_not_loaded 1 75 #define elf_backend_got_header_size 8 76 #define elf_backend_can_gc_sections 1 77 #define elf_backend_can_refcount 1 78 #define elf_backend_rela_normal 1 79 #define elf_backend_default_execstack 0 80 81 #define bfd_elf64_mkobject ppc64_elf_mkobject 82 #define bfd_elf64_bfd_reloc_type_lookup ppc64_elf_reloc_type_lookup 83 #define bfd_elf64_bfd_reloc_name_lookup ppc64_elf_reloc_name_lookup 84 #define bfd_elf64_bfd_merge_private_bfd_data _bfd_generic_verify_endian_match 85 #define bfd_elf64_new_section_hook ppc64_elf_new_section_hook 86 #define bfd_elf64_bfd_link_hash_table_create ppc64_elf_link_hash_table_create 87 #define bfd_elf64_bfd_link_hash_table_free ppc64_elf_link_hash_table_free 88 #define bfd_elf64_get_synthetic_symtab ppc64_elf_get_synthetic_symtab 89 #define bfd_elf64_bfd_link_just_syms ppc64_elf_link_just_syms 90 91 #define elf_backend_object_p ppc64_elf_object_p 92 #define elf_backend_grok_prstatus ppc64_elf_grok_prstatus 93 #define elf_backend_grok_psinfo ppc64_elf_grok_psinfo 94 #define elf_backend_write_core_note ppc64_elf_write_core_note 95 #define elf_backend_create_dynamic_sections ppc64_elf_create_dynamic_sections 96 #define elf_backend_copy_indirect_symbol ppc64_elf_copy_indirect_symbol 97 #define elf_backend_add_symbol_hook ppc64_elf_add_symbol_hook 98 #define elf_backend_check_directives ppc64_elf_process_dot_syms 99 #define elf_backend_as_needed_cleanup ppc64_elf_as_needed_cleanup 100 #define elf_backend_archive_symbol_lookup ppc64_elf_archive_symbol_lookup 101 #define elf_backend_check_relocs ppc64_elf_check_relocs 102 #define elf_backend_gc_keep ppc64_elf_gc_keep 103 #define elf_backend_gc_mark_dynamic_ref ppc64_elf_gc_mark_dynamic_ref 104 #define elf_backend_gc_mark_hook ppc64_elf_gc_mark_hook 105 #define elf_backend_gc_sweep_hook ppc64_elf_gc_sweep_hook 106 #define elf_backend_adjust_dynamic_symbol ppc64_elf_adjust_dynamic_symbol 107 #define elf_backend_hide_symbol ppc64_elf_hide_symbol 108 #define elf_backend_maybe_function_sym ppc64_elf_maybe_function_sym 109 #define elf_backend_always_size_sections ppc64_elf_func_desc_adjust 110 #define elf_backend_size_dynamic_sections ppc64_elf_size_dynamic_sections 111 #define elf_backend_init_index_section _bfd_elf_init_2_index_sections 112 #define elf_backend_action_discarded ppc64_elf_action_discarded 113 #define elf_backend_relocate_section ppc64_elf_relocate_section 114 #define elf_backend_finish_dynamic_symbol ppc64_elf_finish_dynamic_symbol 115 #define elf_backend_reloc_type_class ppc64_elf_reloc_type_class 116 #define elf_backend_finish_dynamic_sections ppc64_elf_finish_dynamic_sections 117 #define elf_backend_link_output_symbol_hook ppc64_elf_output_symbol_hook 118 #define elf_backend_special_sections ppc64_elf_special_sections 119 #define elf_backend_post_process_headers _bfd_elf_set_osabi 120 121 /* The name of the dynamic interpreter. This is put in the .interp 122 section. */ 123 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 124 125 /* The size in bytes of an entry in the procedure linkage table. */ 126 #define PLT_ENTRY_SIZE 24 127 128 /* The initial size of the plt reserved for the dynamic linker. */ 129 #define PLT_INITIAL_ENTRY_SIZE PLT_ENTRY_SIZE 130 131 /* TOC base pointers offset from start of TOC. */ 132 #define TOC_BASE_OFF 0x8000 133 134 /* Offset of tp and dtp pointers from start of TLS block. */ 135 #define TP_OFFSET 0x7000 136 #define DTP_OFFSET 0x8000 137 138 /* .plt call stub instructions. The normal stub is like this, but 139 sometimes the .plt entry crosses a 64k boundary and we need to 140 insert an addi to adjust r12. */ 141 #define PLT_CALL_STUB_SIZE (7*4) 142 #define ADDIS_R12_R2 0x3d820000 /* addis %r12,%r2,xxx@ha */ 143 #define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */ 144 #define LD_R11_0R12 0xe96c0000 /* ld %r11,xxx+0@l(%r12) */ 145 #define MTCTR_R11 0x7d6903a6 /* mtctr %r11 */ 146 #define LD_R2_0R12 0xe84c0000 /* ld %r2,xxx+8@l(%r12) */ 147 /* ld %r11,xxx+16@l(%r12) */ 148 #define BCTR 0x4e800420 /* bctr */ 149 150 151 #define ADDIS_R12_R12 0x3d8c0000 /* addis %r12,%r12,off@ha */ 152 #define ADDI_R12_R12 0x398c0000 /* addi %r12,%r12,off@l */ 153 #define ADDIS_R2_R2 0x3c420000 /* addis %r2,%r2,off@ha */ 154 #define ADDI_R2_R2 0x38420000 /* addi %r2,%r2,off@l */ 155 156 #define XOR_R11_R11_R11 0x7d6b5a78 /* xor %r11,%r11,%r11 */ 157 #define ADD_R12_R12_R11 0x7d8c5a14 /* add %r12,%r12,%r11 */ 158 #define ADD_R2_R2_R11 0x7c425a14 /* add %r2,%r2,%r11 */ 159 #define CMPLDI_R2_0 0x28220000 /* cmpldi %r2,0 */ 160 #define BNECTR 0x4ca20420 /* bnectr+ */ 161 #define BNECTR_P4 0x4ce20420 /* bnectr+ */ 162 163 #define LD_R11_0R2 0xe9620000 /* ld %r11,xxx+0(%r2) */ 164 #define LD_R2_0R2 0xe8420000 /* ld %r2,xxx+0(%r2) */ 165 166 #define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */ 167 168 /* glink call stub instructions. We enter with the index in R0. */ 169 #define GLINK_CALL_STUB_SIZE (16*4) 170 /* 0: */ 171 /* .quad plt0-1f */ 172 /* __glink: */ 173 #define MFLR_R12 0x7d8802a6 /* mflr %12 */ 174 #define BCL_20_31 0x429f0005 /* bcl 20,31,1f */ 175 /* 1: */ 176 #define MFLR_R11 0x7d6802a6 /* mflr %11 */ 177 #define LD_R2_M16R11 0xe84bfff0 /* ld %2,(0b-1b)(%11) */ 178 #define MTLR_R12 0x7d8803a6 /* mtlr %12 */ 179 #define ADD_R12_R2_R11 0x7d825a14 /* add %12,%2,%11 */ 180 /* ld %11,0(%12) */ 181 /* ld %2,8(%12) */ 182 /* mtctr %11 */ 183 /* ld %11,16(%12) */ 184 /* bctr */ 185 186 /* Pad with this. */ 187 #define NOP 0x60000000 188 189 /* Some other nops. */ 190 #define CROR_151515 0x4def7b82 191 #define CROR_313131 0x4ffffb82 192 193 /* .glink entries for the first 32k functions are two instructions. */ 194 #define LI_R0_0 0x38000000 /* li %r0,0 */ 195 #define B_DOT 0x48000000 /* b . */ 196 197 /* After that, we need two instructions to load the index, followed by 198 a branch. */ 199 #define LIS_R0_0 0x3c000000 /* lis %r0,0 */ 200 #define ORI_R0_R0_0 0x60000000 /* ori %r0,%r0,0 */ 201 202 /* Instructions used by the save and restore reg functions. */ 203 #define STD_R0_0R1 0xf8010000 /* std %r0,0(%r1) */ 204 #define STD_R0_0R12 0xf80c0000 /* std %r0,0(%r12) */ 205 #define LD_R0_0R1 0xe8010000 /* ld %r0,0(%r1) */ 206 #define LD_R0_0R12 0xe80c0000 /* ld %r0,0(%r12) */ 207 #define STFD_FR0_0R1 0xd8010000 /* stfd %fr0,0(%r1) */ 208 #define LFD_FR0_0R1 0xc8010000 /* lfd %fr0,0(%r1) */ 209 #define LI_R12_0 0x39800000 /* li %r12,0 */ 210 #define STVX_VR0_R12_R0 0x7c0c01ce /* stvx %v0,%r12,%r0 */ 211 #define LVX_VR0_R12_R0 0x7c0c00ce /* lvx %v0,%r12,%r0 */ 212 #define MTLR_R0 0x7c0803a6 /* mtlr %r0 */ 213 #define BLR 0x4e800020 /* blr */ 214 215 /* Since .opd is an array of descriptors and each entry will end up 216 with identical R_PPC64_RELATIVE relocs, there is really no need to 217 propagate .opd relocs; The dynamic linker should be taught to 218 relocate .opd without reloc entries. */ 219 #ifndef NO_OPD_RELOCS 220 #define NO_OPD_RELOCS 0 221 #endif 222 223 #define ONES(n) (((bfd_vma) 1 << ((n) - 1) << 1) - 1) 224 225 /* Relocation HOWTO's. */ 226 static reloc_howto_type *ppc64_elf_howto_table[(int) R_PPC64_max]; 227 228 static reloc_howto_type ppc64_elf_howto_raw[] = { 229 /* This reloc does nothing. */ 230 HOWTO (R_PPC64_NONE, /* type */ 231 0, /* rightshift */ 232 2, /* size (0 = byte, 1 = short, 2 = long) */ 233 32, /* bitsize */ 234 FALSE, /* pc_relative */ 235 0, /* bitpos */ 236 complain_overflow_dont, /* complain_on_overflow */ 237 bfd_elf_generic_reloc, /* special_function */ 238 "R_PPC64_NONE", /* name */ 239 FALSE, /* partial_inplace */ 240 0, /* src_mask */ 241 0, /* dst_mask */ 242 FALSE), /* pcrel_offset */ 243 244 /* A standard 32 bit relocation. */ 245 HOWTO (R_PPC64_ADDR32, /* type */ 246 0, /* rightshift */ 247 2, /* size (0 = byte, 1 = short, 2 = long) */ 248 32, /* bitsize */ 249 FALSE, /* pc_relative */ 250 0, /* bitpos */ 251 complain_overflow_bitfield, /* complain_on_overflow */ 252 bfd_elf_generic_reloc, /* special_function */ 253 "R_PPC64_ADDR32", /* name */ 254 FALSE, /* partial_inplace */ 255 0, /* src_mask */ 256 0xffffffff, /* dst_mask */ 257 FALSE), /* pcrel_offset */ 258 259 /* An absolute 26 bit branch; the lower two bits must be zero. 260 FIXME: we don't check that, we just clear them. */ 261 HOWTO (R_PPC64_ADDR24, /* type */ 262 0, /* rightshift */ 263 2, /* size (0 = byte, 1 = short, 2 = long) */ 264 26, /* bitsize */ 265 FALSE, /* pc_relative */ 266 0, /* bitpos */ 267 complain_overflow_bitfield, /* complain_on_overflow */ 268 bfd_elf_generic_reloc, /* special_function */ 269 "R_PPC64_ADDR24", /* name */ 270 FALSE, /* partial_inplace */ 271 0, /* src_mask */ 272 0x03fffffc, /* dst_mask */ 273 FALSE), /* pcrel_offset */ 274 275 /* A standard 16 bit relocation. */ 276 HOWTO (R_PPC64_ADDR16, /* type */ 277 0, /* rightshift */ 278 1, /* size (0 = byte, 1 = short, 2 = long) */ 279 16, /* bitsize */ 280 FALSE, /* pc_relative */ 281 0, /* bitpos */ 282 complain_overflow_bitfield, /* complain_on_overflow */ 283 bfd_elf_generic_reloc, /* special_function */ 284 "R_PPC64_ADDR16", /* name */ 285 FALSE, /* partial_inplace */ 286 0, /* src_mask */ 287 0xffff, /* dst_mask */ 288 FALSE), /* pcrel_offset */ 289 290 /* A 16 bit relocation without overflow. */ 291 HOWTO (R_PPC64_ADDR16_LO, /* type */ 292 0, /* rightshift */ 293 1, /* size (0 = byte, 1 = short, 2 = long) */ 294 16, /* bitsize */ 295 FALSE, /* pc_relative */ 296 0, /* bitpos */ 297 complain_overflow_dont,/* complain_on_overflow */ 298 bfd_elf_generic_reloc, /* special_function */ 299 "R_PPC64_ADDR16_LO", /* name */ 300 FALSE, /* partial_inplace */ 301 0, /* src_mask */ 302 0xffff, /* dst_mask */ 303 FALSE), /* pcrel_offset */ 304 305 /* Bits 16-31 of an address. */ 306 HOWTO (R_PPC64_ADDR16_HI, /* type */ 307 16, /* rightshift */ 308 1, /* size (0 = byte, 1 = short, 2 = long) */ 309 16, /* bitsize */ 310 FALSE, /* pc_relative */ 311 0, /* bitpos */ 312 complain_overflow_dont, /* complain_on_overflow */ 313 bfd_elf_generic_reloc, /* special_function */ 314 "R_PPC64_ADDR16_HI", /* name */ 315 FALSE, /* partial_inplace */ 316 0, /* src_mask */ 317 0xffff, /* dst_mask */ 318 FALSE), /* pcrel_offset */ 319 320 /* Bits 16-31 of an address, plus 1 if the contents of the low 16 321 bits, treated as a signed number, is negative. */ 322 HOWTO (R_PPC64_ADDR16_HA, /* type */ 323 16, /* rightshift */ 324 1, /* size (0 = byte, 1 = short, 2 = long) */ 325 16, /* bitsize */ 326 FALSE, /* pc_relative */ 327 0, /* bitpos */ 328 complain_overflow_dont, /* complain_on_overflow */ 329 ppc64_elf_ha_reloc, /* special_function */ 330 "R_PPC64_ADDR16_HA", /* name */ 331 FALSE, /* partial_inplace */ 332 0, /* src_mask */ 333 0xffff, /* dst_mask */ 334 FALSE), /* pcrel_offset */ 335 336 /* An absolute 16 bit branch; the lower two bits must be zero. 337 FIXME: we don't check that, we just clear them. */ 338 HOWTO (R_PPC64_ADDR14, /* type */ 339 0, /* rightshift */ 340 2, /* size (0 = byte, 1 = short, 2 = long) */ 341 16, /* bitsize */ 342 FALSE, /* pc_relative */ 343 0, /* bitpos */ 344 complain_overflow_bitfield, /* complain_on_overflow */ 345 ppc64_elf_branch_reloc, /* special_function */ 346 "R_PPC64_ADDR14", /* name */ 347 FALSE, /* partial_inplace */ 348 0, /* src_mask */ 349 0x0000fffc, /* dst_mask */ 350 FALSE), /* pcrel_offset */ 351 352 /* An absolute 16 bit branch, for which bit 10 should be set to 353 indicate that the branch is expected to be taken. The lower two 354 bits must be zero. */ 355 HOWTO (R_PPC64_ADDR14_BRTAKEN, /* type */ 356 0, /* rightshift */ 357 2, /* size (0 = byte, 1 = short, 2 = long) */ 358 16, /* bitsize */ 359 FALSE, /* pc_relative */ 360 0, /* bitpos */ 361 complain_overflow_bitfield, /* complain_on_overflow */ 362 ppc64_elf_brtaken_reloc, /* special_function */ 363 "R_PPC64_ADDR14_BRTAKEN",/* name */ 364 FALSE, /* partial_inplace */ 365 0, /* src_mask */ 366 0x0000fffc, /* dst_mask */ 367 FALSE), /* pcrel_offset */ 368 369 /* An absolute 16 bit branch, for which bit 10 should be set to 370 indicate that the branch is not expected to be taken. The lower 371 two bits must be zero. */ 372 HOWTO (R_PPC64_ADDR14_BRNTAKEN, /* type */ 373 0, /* rightshift */ 374 2, /* size (0 = byte, 1 = short, 2 = long) */ 375 16, /* bitsize */ 376 FALSE, /* pc_relative */ 377 0, /* bitpos */ 378 complain_overflow_bitfield, /* complain_on_overflow */ 379 ppc64_elf_brtaken_reloc, /* special_function */ 380 "R_PPC64_ADDR14_BRNTAKEN",/* name */ 381 FALSE, /* partial_inplace */ 382 0, /* src_mask */ 383 0x0000fffc, /* dst_mask */ 384 FALSE), /* pcrel_offset */ 385 386 /* A relative 26 bit branch; the lower two bits must be zero. */ 387 HOWTO (R_PPC64_REL24, /* type */ 388 0, /* rightshift */ 389 2, /* size (0 = byte, 1 = short, 2 = long) */ 390 26, /* bitsize */ 391 TRUE, /* pc_relative */ 392 0, /* bitpos */ 393 complain_overflow_signed, /* complain_on_overflow */ 394 ppc64_elf_branch_reloc, /* special_function */ 395 "R_PPC64_REL24", /* name */ 396 FALSE, /* partial_inplace */ 397 0, /* src_mask */ 398 0x03fffffc, /* dst_mask */ 399 TRUE), /* pcrel_offset */ 400 401 /* A relative 16 bit branch; the lower two bits must be zero. */ 402 HOWTO (R_PPC64_REL14, /* type */ 403 0, /* rightshift */ 404 2, /* size (0 = byte, 1 = short, 2 = long) */ 405 16, /* bitsize */ 406 TRUE, /* pc_relative */ 407 0, /* bitpos */ 408 complain_overflow_signed, /* complain_on_overflow */ 409 ppc64_elf_branch_reloc, /* special_function */ 410 "R_PPC64_REL14", /* name */ 411 FALSE, /* partial_inplace */ 412 0, /* src_mask */ 413 0x0000fffc, /* dst_mask */ 414 TRUE), /* pcrel_offset */ 415 416 /* A relative 16 bit branch. Bit 10 should be set to indicate that 417 the branch is expected to be taken. The lower two bits must be 418 zero. */ 419 HOWTO (R_PPC64_REL14_BRTAKEN, /* type */ 420 0, /* rightshift */ 421 2, /* size (0 = byte, 1 = short, 2 = long) */ 422 16, /* bitsize */ 423 TRUE, /* pc_relative */ 424 0, /* bitpos */ 425 complain_overflow_signed, /* complain_on_overflow */ 426 ppc64_elf_brtaken_reloc, /* special_function */ 427 "R_PPC64_REL14_BRTAKEN", /* name */ 428 FALSE, /* partial_inplace */ 429 0, /* src_mask */ 430 0x0000fffc, /* dst_mask */ 431 TRUE), /* pcrel_offset */ 432 433 /* A relative 16 bit branch. Bit 10 should be set to indicate that 434 the branch is not expected to be taken. The lower two bits must 435 be zero. */ 436 HOWTO (R_PPC64_REL14_BRNTAKEN, /* type */ 437 0, /* rightshift */ 438 2, /* size (0 = byte, 1 = short, 2 = long) */ 439 16, /* bitsize */ 440 TRUE, /* pc_relative */ 441 0, /* bitpos */ 442 complain_overflow_signed, /* complain_on_overflow */ 443 ppc64_elf_brtaken_reloc, /* special_function */ 444 "R_PPC64_REL14_BRNTAKEN",/* name */ 445 FALSE, /* partial_inplace */ 446 0, /* src_mask */ 447 0x0000fffc, /* dst_mask */ 448 TRUE), /* pcrel_offset */ 449 450 /* Like R_PPC64_ADDR16, but referring to the GOT table entry for the 451 symbol. */ 452 HOWTO (R_PPC64_GOT16, /* type */ 453 0, /* rightshift */ 454 1, /* size (0 = byte, 1 = short, 2 = long) */ 455 16, /* bitsize */ 456 FALSE, /* pc_relative */ 457 0, /* bitpos */ 458 complain_overflow_signed, /* complain_on_overflow */ 459 ppc64_elf_unhandled_reloc, /* special_function */ 460 "R_PPC64_GOT16", /* name */ 461 FALSE, /* partial_inplace */ 462 0, /* src_mask */ 463 0xffff, /* dst_mask */ 464 FALSE), /* pcrel_offset */ 465 466 /* Like R_PPC64_ADDR16_LO, but referring to the GOT table entry for 467 the symbol. */ 468 HOWTO (R_PPC64_GOT16_LO, /* type */ 469 0, /* rightshift */ 470 1, /* size (0 = byte, 1 = short, 2 = long) */ 471 16, /* bitsize */ 472 FALSE, /* pc_relative */ 473 0, /* bitpos */ 474 complain_overflow_dont, /* complain_on_overflow */ 475 ppc64_elf_unhandled_reloc, /* special_function */ 476 "R_PPC64_GOT16_LO", /* name */ 477 FALSE, /* partial_inplace */ 478 0, /* src_mask */ 479 0xffff, /* dst_mask */ 480 FALSE), /* pcrel_offset */ 481 482 /* Like R_PPC64_ADDR16_HI, but referring to the GOT table entry for 483 the symbol. */ 484 HOWTO (R_PPC64_GOT16_HI, /* type */ 485 16, /* rightshift */ 486 1, /* size (0 = byte, 1 = short, 2 = long) */ 487 16, /* bitsize */ 488 FALSE, /* pc_relative */ 489 0, /* bitpos */ 490 complain_overflow_dont,/* complain_on_overflow */ 491 ppc64_elf_unhandled_reloc, /* special_function */ 492 "R_PPC64_GOT16_HI", /* name */ 493 FALSE, /* partial_inplace */ 494 0, /* src_mask */ 495 0xffff, /* dst_mask */ 496 FALSE), /* pcrel_offset */ 497 498 /* Like R_PPC64_ADDR16_HA, but referring to the GOT table entry for 499 the symbol. */ 500 HOWTO (R_PPC64_GOT16_HA, /* type */ 501 16, /* rightshift */ 502 1, /* size (0 = byte, 1 = short, 2 = long) */ 503 16, /* bitsize */ 504 FALSE, /* pc_relative */ 505 0, /* bitpos */ 506 complain_overflow_dont,/* complain_on_overflow */ 507 ppc64_elf_unhandled_reloc, /* special_function */ 508 "R_PPC64_GOT16_HA", /* name */ 509 FALSE, /* partial_inplace */ 510 0, /* src_mask */ 511 0xffff, /* dst_mask */ 512 FALSE), /* pcrel_offset */ 513 514 /* This is used only by the dynamic linker. The symbol should exist 515 both in the object being run and in some shared library. The 516 dynamic linker copies the data addressed by the symbol from the 517 shared library into the object, because the object being 518 run has to have the data at some particular address. */ 519 HOWTO (R_PPC64_COPY, /* type */ 520 0, /* rightshift */ 521 0, /* this one is variable size */ 522 0, /* bitsize */ 523 FALSE, /* pc_relative */ 524 0, /* bitpos */ 525 complain_overflow_dont, /* complain_on_overflow */ 526 ppc64_elf_unhandled_reloc, /* special_function */ 527 "R_PPC64_COPY", /* name */ 528 FALSE, /* partial_inplace */ 529 0, /* src_mask */ 530 0, /* dst_mask */ 531 FALSE), /* pcrel_offset */ 532 533 /* Like R_PPC64_ADDR64, but used when setting global offset table 534 entries. */ 535 HOWTO (R_PPC64_GLOB_DAT, /* type */ 536 0, /* rightshift */ 537 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 538 64, /* bitsize */ 539 FALSE, /* pc_relative */ 540 0, /* bitpos */ 541 complain_overflow_dont, /* complain_on_overflow */ 542 ppc64_elf_unhandled_reloc, /* special_function */ 543 "R_PPC64_GLOB_DAT", /* name */ 544 FALSE, /* partial_inplace */ 545 0, /* src_mask */ 546 ONES (64), /* dst_mask */ 547 FALSE), /* pcrel_offset */ 548 549 /* Created by the link editor. Marks a procedure linkage table 550 entry for a symbol. */ 551 HOWTO (R_PPC64_JMP_SLOT, /* type */ 552 0, /* rightshift */ 553 0, /* size (0 = byte, 1 = short, 2 = long) */ 554 0, /* bitsize */ 555 FALSE, /* pc_relative */ 556 0, /* bitpos */ 557 complain_overflow_dont, /* complain_on_overflow */ 558 ppc64_elf_unhandled_reloc, /* special_function */ 559 "R_PPC64_JMP_SLOT", /* name */ 560 FALSE, /* partial_inplace */ 561 0, /* src_mask */ 562 0, /* dst_mask */ 563 FALSE), /* pcrel_offset */ 564 565 /* Used only by the dynamic linker. When the object is run, this 566 doubleword64 is set to the load address of the object, plus the 567 addend. */ 568 HOWTO (R_PPC64_RELATIVE, /* type */ 569 0, /* rightshift */ 570 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 571 64, /* bitsize */ 572 FALSE, /* pc_relative */ 573 0, /* bitpos */ 574 complain_overflow_dont, /* complain_on_overflow */ 575 bfd_elf_generic_reloc, /* special_function */ 576 "R_PPC64_RELATIVE", /* name */ 577 FALSE, /* partial_inplace */ 578 0, /* src_mask */ 579 ONES (64), /* dst_mask */ 580 FALSE), /* pcrel_offset */ 581 582 /* Like R_PPC64_ADDR32, but may be unaligned. */ 583 HOWTO (R_PPC64_UADDR32, /* type */ 584 0, /* rightshift */ 585 2, /* size (0 = byte, 1 = short, 2 = long) */ 586 32, /* bitsize */ 587 FALSE, /* pc_relative */ 588 0, /* bitpos */ 589 complain_overflow_bitfield, /* complain_on_overflow */ 590 bfd_elf_generic_reloc, /* special_function */ 591 "R_PPC64_UADDR32", /* name */ 592 FALSE, /* partial_inplace */ 593 0, /* src_mask */ 594 0xffffffff, /* dst_mask */ 595 FALSE), /* pcrel_offset */ 596 597 /* Like R_PPC64_ADDR16, but may be unaligned. */ 598 HOWTO (R_PPC64_UADDR16, /* type */ 599 0, /* rightshift */ 600 1, /* size (0 = byte, 1 = short, 2 = long) */ 601 16, /* bitsize */ 602 FALSE, /* pc_relative */ 603 0, /* bitpos */ 604 complain_overflow_bitfield, /* complain_on_overflow */ 605 bfd_elf_generic_reloc, /* special_function */ 606 "R_PPC64_UADDR16", /* name */ 607 FALSE, /* partial_inplace */ 608 0, /* src_mask */ 609 0xffff, /* dst_mask */ 610 FALSE), /* pcrel_offset */ 611 612 /* 32-bit PC relative. */ 613 HOWTO (R_PPC64_REL32, /* type */ 614 0, /* rightshift */ 615 2, /* size (0 = byte, 1 = short, 2 = long) */ 616 32, /* bitsize */ 617 TRUE, /* pc_relative */ 618 0, /* bitpos */ 619 /* FIXME: Verify. Was complain_overflow_bitfield. */ 620 complain_overflow_signed, /* complain_on_overflow */ 621 bfd_elf_generic_reloc, /* special_function */ 622 "R_PPC64_REL32", /* name */ 623 FALSE, /* partial_inplace */ 624 0, /* src_mask */ 625 0xffffffff, /* dst_mask */ 626 TRUE), /* pcrel_offset */ 627 628 /* 32-bit relocation to the symbol's procedure linkage table. */ 629 HOWTO (R_PPC64_PLT32, /* type */ 630 0, /* rightshift */ 631 2, /* size (0 = byte, 1 = short, 2 = long) */ 632 32, /* bitsize */ 633 FALSE, /* pc_relative */ 634 0, /* bitpos */ 635 complain_overflow_bitfield, /* complain_on_overflow */ 636 ppc64_elf_unhandled_reloc, /* special_function */ 637 "R_PPC64_PLT32", /* name */ 638 FALSE, /* partial_inplace */ 639 0, /* src_mask */ 640 0xffffffff, /* dst_mask */ 641 FALSE), /* pcrel_offset */ 642 643 /* 32-bit PC relative relocation to the symbol's procedure linkage table. 644 FIXME: R_PPC64_PLTREL32 not supported. */ 645 HOWTO (R_PPC64_PLTREL32, /* type */ 646 0, /* rightshift */ 647 2, /* size (0 = byte, 1 = short, 2 = long) */ 648 32, /* bitsize */ 649 TRUE, /* pc_relative */ 650 0, /* bitpos */ 651 complain_overflow_signed, /* complain_on_overflow */ 652 bfd_elf_generic_reloc, /* special_function */ 653 "R_PPC64_PLTREL32", /* name */ 654 FALSE, /* partial_inplace */ 655 0, /* src_mask */ 656 0xffffffff, /* dst_mask */ 657 TRUE), /* pcrel_offset */ 658 659 /* Like R_PPC64_ADDR16_LO, but referring to the PLT table entry for 660 the symbol. */ 661 HOWTO (R_PPC64_PLT16_LO, /* type */ 662 0, /* rightshift */ 663 1, /* size (0 = byte, 1 = short, 2 = long) */ 664 16, /* bitsize */ 665 FALSE, /* pc_relative */ 666 0, /* bitpos */ 667 complain_overflow_dont, /* complain_on_overflow */ 668 ppc64_elf_unhandled_reloc, /* special_function */ 669 "R_PPC64_PLT16_LO", /* name */ 670 FALSE, /* partial_inplace */ 671 0, /* src_mask */ 672 0xffff, /* dst_mask */ 673 FALSE), /* pcrel_offset */ 674 675 /* Like R_PPC64_ADDR16_HI, but referring to the PLT table entry for 676 the symbol. */ 677 HOWTO (R_PPC64_PLT16_HI, /* type */ 678 16, /* rightshift */ 679 1, /* size (0 = byte, 1 = short, 2 = long) */ 680 16, /* bitsize */ 681 FALSE, /* pc_relative */ 682 0, /* bitpos */ 683 complain_overflow_dont, /* complain_on_overflow */ 684 ppc64_elf_unhandled_reloc, /* special_function */ 685 "R_PPC64_PLT16_HI", /* name */ 686 FALSE, /* partial_inplace */ 687 0, /* src_mask */ 688 0xffff, /* dst_mask */ 689 FALSE), /* pcrel_offset */ 690 691 /* Like R_PPC64_ADDR16_HA, but referring to the PLT table entry for 692 the symbol. */ 693 HOWTO (R_PPC64_PLT16_HA, /* type */ 694 16, /* rightshift */ 695 1, /* size (0 = byte, 1 = short, 2 = long) */ 696 16, /* bitsize */ 697 FALSE, /* pc_relative */ 698 0, /* bitpos */ 699 complain_overflow_dont, /* complain_on_overflow */ 700 ppc64_elf_unhandled_reloc, /* special_function */ 701 "R_PPC64_PLT16_HA", /* name */ 702 FALSE, /* partial_inplace */ 703 0, /* src_mask */ 704 0xffff, /* dst_mask */ 705 FALSE), /* pcrel_offset */ 706 707 /* 16-bit section relative relocation. */ 708 HOWTO (R_PPC64_SECTOFF, /* type */ 709 0, /* rightshift */ 710 1, /* size (0 = byte, 1 = short, 2 = long) */ 711 16, /* bitsize */ 712 FALSE, /* pc_relative */ 713 0, /* bitpos */ 714 complain_overflow_bitfield, /* complain_on_overflow */ 715 ppc64_elf_sectoff_reloc, /* special_function */ 716 "R_PPC64_SECTOFF", /* name */ 717 FALSE, /* partial_inplace */ 718 0, /* src_mask */ 719 0xffff, /* dst_mask */ 720 FALSE), /* pcrel_offset */ 721 722 /* Like R_PPC64_SECTOFF, but no overflow warning. */ 723 HOWTO (R_PPC64_SECTOFF_LO, /* type */ 724 0, /* rightshift */ 725 1, /* size (0 = byte, 1 = short, 2 = long) */ 726 16, /* bitsize */ 727 FALSE, /* pc_relative */ 728 0, /* bitpos */ 729 complain_overflow_dont, /* complain_on_overflow */ 730 ppc64_elf_sectoff_reloc, /* special_function */ 731 "R_PPC64_SECTOFF_LO", /* name */ 732 FALSE, /* partial_inplace */ 733 0, /* src_mask */ 734 0xffff, /* dst_mask */ 735 FALSE), /* pcrel_offset */ 736 737 /* 16-bit upper half section relative relocation. */ 738 HOWTO (R_PPC64_SECTOFF_HI, /* type */ 739 16, /* rightshift */ 740 1, /* size (0 = byte, 1 = short, 2 = long) */ 741 16, /* bitsize */ 742 FALSE, /* pc_relative */ 743 0, /* bitpos */ 744 complain_overflow_dont, /* complain_on_overflow */ 745 ppc64_elf_sectoff_reloc, /* special_function */ 746 "R_PPC64_SECTOFF_HI", /* name */ 747 FALSE, /* partial_inplace */ 748 0, /* src_mask */ 749 0xffff, /* dst_mask */ 750 FALSE), /* pcrel_offset */ 751 752 /* 16-bit upper half adjusted section relative relocation. */ 753 HOWTO (R_PPC64_SECTOFF_HA, /* type */ 754 16, /* rightshift */ 755 1, /* size (0 = byte, 1 = short, 2 = long) */ 756 16, /* bitsize */ 757 FALSE, /* pc_relative */ 758 0, /* bitpos */ 759 complain_overflow_dont, /* complain_on_overflow */ 760 ppc64_elf_sectoff_ha_reloc, /* special_function */ 761 "R_PPC64_SECTOFF_HA", /* name */ 762 FALSE, /* partial_inplace */ 763 0, /* src_mask */ 764 0xffff, /* dst_mask */ 765 FALSE), /* pcrel_offset */ 766 767 /* Like R_PPC64_REL24 without touching the two least significant bits. */ 768 HOWTO (R_PPC64_REL30, /* type */ 769 2, /* rightshift */ 770 2, /* size (0 = byte, 1 = short, 2 = long) */ 771 30, /* bitsize */ 772 TRUE, /* pc_relative */ 773 0, /* bitpos */ 774 complain_overflow_dont, /* complain_on_overflow */ 775 bfd_elf_generic_reloc, /* special_function */ 776 "R_PPC64_REL30", /* name */ 777 FALSE, /* partial_inplace */ 778 0, /* src_mask */ 779 0xfffffffc, /* dst_mask */ 780 TRUE), /* pcrel_offset */ 781 782 /* Relocs in the 64-bit PowerPC ELF ABI, not in the 32-bit ABI. */ 783 784 /* A standard 64-bit relocation. */ 785 HOWTO (R_PPC64_ADDR64, /* type */ 786 0, /* rightshift */ 787 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 788 64, /* bitsize */ 789 FALSE, /* pc_relative */ 790 0, /* bitpos */ 791 complain_overflow_dont, /* complain_on_overflow */ 792 bfd_elf_generic_reloc, /* special_function */ 793 "R_PPC64_ADDR64", /* name */ 794 FALSE, /* partial_inplace */ 795 0, /* src_mask */ 796 ONES (64), /* dst_mask */ 797 FALSE), /* pcrel_offset */ 798 799 /* The bits 32-47 of an address. */ 800 HOWTO (R_PPC64_ADDR16_HIGHER, /* type */ 801 32, /* rightshift */ 802 1, /* size (0 = byte, 1 = short, 2 = long) */ 803 16, /* bitsize */ 804 FALSE, /* pc_relative */ 805 0, /* bitpos */ 806 complain_overflow_dont, /* complain_on_overflow */ 807 bfd_elf_generic_reloc, /* special_function */ 808 "R_PPC64_ADDR16_HIGHER", /* name */ 809 FALSE, /* partial_inplace */ 810 0, /* src_mask */ 811 0xffff, /* dst_mask */ 812 FALSE), /* pcrel_offset */ 813 814 /* The bits 32-47 of an address, plus 1 if the contents of the low 815 16 bits, treated as a signed number, is negative. */ 816 HOWTO (R_PPC64_ADDR16_HIGHERA, /* type */ 817 32, /* rightshift */ 818 1, /* size (0 = byte, 1 = short, 2 = long) */ 819 16, /* bitsize */ 820 FALSE, /* pc_relative */ 821 0, /* bitpos */ 822 complain_overflow_dont, /* complain_on_overflow */ 823 ppc64_elf_ha_reloc, /* special_function */ 824 "R_PPC64_ADDR16_HIGHERA", /* name */ 825 FALSE, /* partial_inplace */ 826 0, /* src_mask */ 827 0xffff, /* dst_mask */ 828 FALSE), /* pcrel_offset */ 829 830 /* The bits 48-63 of an address. */ 831 HOWTO (R_PPC64_ADDR16_HIGHEST,/* type */ 832 48, /* rightshift */ 833 1, /* size (0 = byte, 1 = short, 2 = long) */ 834 16, /* bitsize */ 835 FALSE, /* pc_relative */ 836 0, /* bitpos */ 837 complain_overflow_dont, /* complain_on_overflow */ 838 bfd_elf_generic_reloc, /* special_function */ 839 "R_PPC64_ADDR16_HIGHEST", /* name */ 840 FALSE, /* partial_inplace */ 841 0, /* src_mask */ 842 0xffff, /* dst_mask */ 843 FALSE), /* pcrel_offset */ 844 845 /* The bits 48-63 of an address, plus 1 if the contents of the low 846 16 bits, treated as a signed number, is negative. */ 847 HOWTO (R_PPC64_ADDR16_HIGHESTA,/* type */ 848 48, /* rightshift */ 849 1, /* size (0 = byte, 1 = short, 2 = long) */ 850 16, /* bitsize */ 851 FALSE, /* pc_relative */ 852 0, /* bitpos */ 853 complain_overflow_dont, /* complain_on_overflow */ 854 ppc64_elf_ha_reloc, /* special_function */ 855 "R_PPC64_ADDR16_HIGHESTA", /* name */ 856 FALSE, /* partial_inplace */ 857 0, /* src_mask */ 858 0xffff, /* dst_mask */ 859 FALSE), /* pcrel_offset */ 860 861 /* Like ADDR64, but may be unaligned. */ 862 HOWTO (R_PPC64_UADDR64, /* type */ 863 0, /* rightshift */ 864 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 865 64, /* bitsize */ 866 FALSE, /* pc_relative */ 867 0, /* bitpos */ 868 complain_overflow_dont, /* complain_on_overflow */ 869 bfd_elf_generic_reloc, /* special_function */ 870 "R_PPC64_UADDR64", /* name */ 871 FALSE, /* partial_inplace */ 872 0, /* src_mask */ 873 ONES (64), /* dst_mask */ 874 FALSE), /* pcrel_offset */ 875 876 /* 64-bit relative relocation. */ 877 HOWTO (R_PPC64_REL64, /* type */ 878 0, /* rightshift */ 879 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 880 64, /* bitsize */ 881 TRUE, /* pc_relative */ 882 0, /* bitpos */ 883 complain_overflow_dont, /* complain_on_overflow */ 884 bfd_elf_generic_reloc, /* special_function */ 885 "R_PPC64_REL64", /* name */ 886 FALSE, /* partial_inplace */ 887 0, /* src_mask */ 888 ONES (64), /* dst_mask */ 889 TRUE), /* pcrel_offset */ 890 891 /* 64-bit relocation to the symbol's procedure linkage table. */ 892 HOWTO (R_PPC64_PLT64, /* type */ 893 0, /* rightshift */ 894 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 895 64, /* bitsize */ 896 FALSE, /* pc_relative */ 897 0, /* bitpos */ 898 complain_overflow_dont, /* complain_on_overflow */ 899 ppc64_elf_unhandled_reloc, /* special_function */ 900 "R_PPC64_PLT64", /* name */ 901 FALSE, /* partial_inplace */ 902 0, /* src_mask */ 903 ONES (64), /* dst_mask */ 904 FALSE), /* pcrel_offset */ 905 906 /* 64-bit PC relative relocation to the symbol's procedure linkage 907 table. */ 908 /* FIXME: R_PPC64_PLTREL64 not supported. */ 909 HOWTO (R_PPC64_PLTREL64, /* type */ 910 0, /* rightshift */ 911 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 912 64, /* bitsize */ 913 TRUE, /* pc_relative */ 914 0, /* bitpos */ 915 complain_overflow_dont, /* complain_on_overflow */ 916 ppc64_elf_unhandled_reloc, /* special_function */ 917 "R_PPC64_PLTREL64", /* name */ 918 FALSE, /* partial_inplace */ 919 0, /* src_mask */ 920 ONES (64), /* dst_mask */ 921 TRUE), /* pcrel_offset */ 922 923 /* 16 bit TOC-relative relocation. */ 924 925 /* R_PPC64_TOC16 47 half16* S + A - .TOC. */ 926 HOWTO (R_PPC64_TOC16, /* type */ 927 0, /* rightshift */ 928 1, /* size (0 = byte, 1 = short, 2 = long) */ 929 16, /* bitsize */ 930 FALSE, /* pc_relative */ 931 0, /* bitpos */ 932 complain_overflow_signed, /* complain_on_overflow */ 933 ppc64_elf_toc_reloc, /* special_function */ 934 "R_PPC64_TOC16", /* name */ 935 FALSE, /* partial_inplace */ 936 0, /* src_mask */ 937 0xffff, /* dst_mask */ 938 FALSE), /* pcrel_offset */ 939 940 /* 16 bit TOC-relative relocation without overflow. */ 941 942 /* R_PPC64_TOC16_LO 48 half16 #lo (S + A - .TOC.) */ 943 HOWTO (R_PPC64_TOC16_LO, /* type */ 944 0, /* rightshift */ 945 1, /* size (0 = byte, 1 = short, 2 = long) */ 946 16, /* bitsize */ 947 FALSE, /* pc_relative */ 948 0, /* bitpos */ 949 complain_overflow_dont, /* complain_on_overflow */ 950 ppc64_elf_toc_reloc, /* special_function */ 951 "R_PPC64_TOC16_LO", /* name */ 952 FALSE, /* partial_inplace */ 953 0, /* src_mask */ 954 0xffff, /* dst_mask */ 955 FALSE), /* pcrel_offset */ 956 957 /* 16 bit TOC-relative relocation, high 16 bits. */ 958 959 /* R_PPC64_TOC16_HI 49 half16 #hi (S + A - .TOC.) */ 960 HOWTO (R_PPC64_TOC16_HI, /* type */ 961 16, /* rightshift */ 962 1, /* size (0 = byte, 1 = short, 2 = long) */ 963 16, /* bitsize */ 964 FALSE, /* pc_relative */ 965 0, /* bitpos */ 966 complain_overflow_dont, /* complain_on_overflow */ 967 ppc64_elf_toc_reloc, /* special_function */ 968 "R_PPC64_TOC16_HI", /* name */ 969 FALSE, /* partial_inplace */ 970 0, /* src_mask */ 971 0xffff, /* dst_mask */ 972 FALSE), /* pcrel_offset */ 973 974 /* 16 bit TOC-relative relocation, high 16 bits, plus 1 if the 975 contents of the low 16 bits, treated as a signed number, is 976 negative. */ 977 978 /* R_PPC64_TOC16_HA 50 half16 #ha (S + A - .TOC.) */ 979 HOWTO (R_PPC64_TOC16_HA, /* type */ 980 16, /* rightshift */ 981 1, /* size (0 = byte, 1 = short, 2 = long) */ 982 16, /* bitsize */ 983 FALSE, /* pc_relative */ 984 0, /* bitpos */ 985 complain_overflow_dont, /* complain_on_overflow */ 986 ppc64_elf_toc_ha_reloc, /* special_function */ 987 "R_PPC64_TOC16_HA", /* name */ 988 FALSE, /* partial_inplace */ 989 0, /* src_mask */ 990 0xffff, /* dst_mask */ 991 FALSE), /* pcrel_offset */ 992 993 /* 64-bit relocation; insert value of TOC base (.TOC.). */ 994 995 /* R_PPC64_TOC 51 doubleword64 .TOC. */ 996 HOWTO (R_PPC64_TOC, /* type */ 997 0, /* rightshift */ 998 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 999 64, /* bitsize */ 1000 FALSE, /* pc_relative */ 1001 0, /* bitpos */ 1002 complain_overflow_bitfield, /* complain_on_overflow */ 1003 ppc64_elf_toc64_reloc, /* special_function */ 1004 "R_PPC64_TOC", /* name */ 1005 FALSE, /* partial_inplace */ 1006 0, /* src_mask */ 1007 ONES (64), /* dst_mask */ 1008 FALSE), /* pcrel_offset */ 1009 1010 /* Like R_PPC64_GOT16, but also informs the link editor that the 1011 value to relocate may (!) refer to a PLT entry which the link 1012 editor (a) may replace with the symbol value. If the link editor 1013 is unable to fully resolve the symbol, it may (b) create a PLT 1014 entry and store the address to the new PLT entry in the GOT. 1015 This permits lazy resolution of function symbols at run time. 1016 The link editor may also skip all of this and just (c) emit a 1017 R_PPC64_GLOB_DAT to tie the symbol to the GOT entry. */ 1018 /* FIXME: R_PPC64_PLTGOT16 not implemented. */ 1019 HOWTO (R_PPC64_PLTGOT16, /* type */ 1020 0, /* rightshift */ 1021 1, /* size (0 = byte, 1 = short, 2 = long) */ 1022 16, /* bitsize */ 1023 FALSE, /* pc_relative */ 1024 0, /* bitpos */ 1025 complain_overflow_signed, /* complain_on_overflow */ 1026 ppc64_elf_unhandled_reloc, /* special_function */ 1027 "R_PPC64_PLTGOT16", /* name */ 1028 FALSE, /* partial_inplace */ 1029 0, /* src_mask */ 1030 0xffff, /* dst_mask */ 1031 FALSE), /* pcrel_offset */ 1032 1033 /* Like R_PPC64_PLTGOT16, but without overflow. */ 1034 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */ 1035 HOWTO (R_PPC64_PLTGOT16_LO, /* type */ 1036 0, /* rightshift */ 1037 1, /* size (0 = byte, 1 = short, 2 = long) */ 1038 16, /* bitsize */ 1039 FALSE, /* pc_relative */ 1040 0, /* bitpos */ 1041 complain_overflow_dont, /* complain_on_overflow */ 1042 ppc64_elf_unhandled_reloc, /* special_function */ 1043 "R_PPC64_PLTGOT16_LO", /* name */ 1044 FALSE, /* partial_inplace */ 1045 0, /* src_mask */ 1046 0xffff, /* dst_mask */ 1047 FALSE), /* pcrel_offset */ 1048 1049 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address. */ 1050 /* FIXME: R_PPC64_PLTGOT16_HI not implemented. */ 1051 HOWTO (R_PPC64_PLTGOT16_HI, /* type */ 1052 16, /* rightshift */ 1053 1, /* size (0 = byte, 1 = short, 2 = long) */ 1054 16, /* bitsize */ 1055 FALSE, /* pc_relative */ 1056 0, /* bitpos */ 1057 complain_overflow_dont, /* complain_on_overflow */ 1058 ppc64_elf_unhandled_reloc, /* special_function */ 1059 "R_PPC64_PLTGOT16_HI", /* name */ 1060 FALSE, /* partial_inplace */ 1061 0, /* src_mask */ 1062 0xffff, /* dst_mask */ 1063 FALSE), /* pcrel_offset */ 1064 1065 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address, plus 1066 1 if the contents of the low 16 bits, treated as a signed number, 1067 is negative. */ 1068 /* FIXME: R_PPC64_PLTGOT16_HA not implemented. */ 1069 HOWTO (R_PPC64_PLTGOT16_HA, /* type */ 1070 16, /* rightshift */ 1071 1, /* size (0 = byte, 1 = short, 2 = long) */ 1072 16, /* bitsize */ 1073 FALSE, /* pc_relative */ 1074 0, /* bitpos */ 1075 complain_overflow_dont,/* complain_on_overflow */ 1076 ppc64_elf_unhandled_reloc, /* special_function */ 1077 "R_PPC64_PLTGOT16_HA", /* name */ 1078 FALSE, /* partial_inplace */ 1079 0, /* src_mask */ 1080 0xffff, /* dst_mask */ 1081 FALSE), /* pcrel_offset */ 1082 1083 /* Like R_PPC64_ADDR16, but for instructions with a DS field. */ 1084 HOWTO (R_PPC64_ADDR16_DS, /* type */ 1085 0, /* rightshift */ 1086 1, /* size (0 = byte, 1 = short, 2 = long) */ 1087 16, /* bitsize */ 1088 FALSE, /* pc_relative */ 1089 0, /* bitpos */ 1090 complain_overflow_bitfield, /* complain_on_overflow */ 1091 bfd_elf_generic_reloc, /* special_function */ 1092 "R_PPC64_ADDR16_DS", /* name */ 1093 FALSE, /* partial_inplace */ 1094 0, /* src_mask */ 1095 0xfffc, /* dst_mask */ 1096 FALSE), /* pcrel_offset */ 1097 1098 /* Like R_PPC64_ADDR16_LO, but for instructions with a DS field. */ 1099 HOWTO (R_PPC64_ADDR16_LO_DS, /* type */ 1100 0, /* rightshift */ 1101 1, /* size (0 = byte, 1 = short, 2 = long) */ 1102 16, /* bitsize */ 1103 FALSE, /* pc_relative */ 1104 0, /* bitpos */ 1105 complain_overflow_dont,/* complain_on_overflow */ 1106 bfd_elf_generic_reloc, /* special_function */ 1107 "R_PPC64_ADDR16_LO_DS",/* name */ 1108 FALSE, /* partial_inplace */ 1109 0, /* src_mask */ 1110 0xfffc, /* dst_mask */ 1111 FALSE), /* pcrel_offset */ 1112 1113 /* Like R_PPC64_GOT16, but for instructions with a DS field. */ 1114 HOWTO (R_PPC64_GOT16_DS, /* type */ 1115 0, /* rightshift */ 1116 1, /* size (0 = byte, 1 = short, 2 = long) */ 1117 16, /* bitsize */ 1118 FALSE, /* pc_relative */ 1119 0, /* bitpos */ 1120 complain_overflow_signed, /* complain_on_overflow */ 1121 ppc64_elf_unhandled_reloc, /* special_function */ 1122 "R_PPC64_GOT16_DS", /* name */ 1123 FALSE, /* partial_inplace */ 1124 0, /* src_mask */ 1125 0xfffc, /* dst_mask */ 1126 FALSE), /* pcrel_offset */ 1127 1128 /* Like R_PPC64_GOT16_LO, but for instructions with a DS field. */ 1129 HOWTO (R_PPC64_GOT16_LO_DS, /* type */ 1130 0, /* rightshift */ 1131 1, /* size (0 = byte, 1 = short, 2 = long) */ 1132 16, /* bitsize */ 1133 FALSE, /* pc_relative */ 1134 0, /* bitpos */ 1135 complain_overflow_dont, /* complain_on_overflow */ 1136 ppc64_elf_unhandled_reloc, /* special_function */ 1137 "R_PPC64_GOT16_LO_DS", /* name */ 1138 FALSE, /* partial_inplace */ 1139 0, /* src_mask */ 1140 0xfffc, /* dst_mask */ 1141 FALSE), /* pcrel_offset */ 1142 1143 /* Like R_PPC64_PLT16_LO, but for instructions with a DS field. */ 1144 HOWTO (R_PPC64_PLT16_LO_DS, /* type */ 1145 0, /* rightshift */ 1146 1, /* size (0 = byte, 1 = short, 2 = long) */ 1147 16, /* bitsize */ 1148 FALSE, /* pc_relative */ 1149 0, /* bitpos */ 1150 complain_overflow_dont, /* complain_on_overflow */ 1151 ppc64_elf_unhandled_reloc, /* special_function */ 1152 "R_PPC64_PLT16_LO_DS", /* name */ 1153 FALSE, /* partial_inplace */ 1154 0, /* src_mask */ 1155 0xfffc, /* dst_mask */ 1156 FALSE), /* pcrel_offset */ 1157 1158 /* Like R_PPC64_SECTOFF, but for instructions with a DS field. */ 1159 HOWTO (R_PPC64_SECTOFF_DS, /* type */ 1160 0, /* rightshift */ 1161 1, /* size (0 = byte, 1 = short, 2 = long) */ 1162 16, /* bitsize */ 1163 FALSE, /* pc_relative */ 1164 0, /* bitpos */ 1165 complain_overflow_bitfield, /* complain_on_overflow */ 1166 ppc64_elf_sectoff_reloc, /* special_function */ 1167 "R_PPC64_SECTOFF_DS", /* name */ 1168 FALSE, /* partial_inplace */ 1169 0, /* src_mask */ 1170 0xfffc, /* dst_mask */ 1171 FALSE), /* pcrel_offset */ 1172 1173 /* Like R_PPC64_SECTOFF_LO, but for instructions with a DS field. */ 1174 HOWTO (R_PPC64_SECTOFF_LO_DS, /* type */ 1175 0, /* rightshift */ 1176 1, /* size (0 = byte, 1 = short, 2 = long) */ 1177 16, /* bitsize */ 1178 FALSE, /* pc_relative */ 1179 0, /* bitpos */ 1180 complain_overflow_dont, /* complain_on_overflow */ 1181 ppc64_elf_sectoff_reloc, /* special_function */ 1182 "R_PPC64_SECTOFF_LO_DS",/* name */ 1183 FALSE, /* partial_inplace */ 1184 0, /* src_mask */ 1185 0xfffc, /* dst_mask */ 1186 FALSE), /* pcrel_offset */ 1187 1188 /* Like R_PPC64_TOC16, but for instructions with a DS field. */ 1189 HOWTO (R_PPC64_TOC16_DS, /* type */ 1190 0, /* rightshift */ 1191 1, /* size (0 = byte, 1 = short, 2 = long) */ 1192 16, /* bitsize */ 1193 FALSE, /* pc_relative */ 1194 0, /* bitpos */ 1195 complain_overflow_signed, /* complain_on_overflow */ 1196 ppc64_elf_toc_reloc, /* special_function */ 1197 "R_PPC64_TOC16_DS", /* name */ 1198 FALSE, /* partial_inplace */ 1199 0, /* src_mask */ 1200 0xfffc, /* dst_mask */ 1201 FALSE), /* pcrel_offset */ 1202 1203 /* Like R_PPC64_TOC16_LO, but for instructions with a DS field. */ 1204 HOWTO (R_PPC64_TOC16_LO_DS, /* type */ 1205 0, /* rightshift */ 1206 1, /* size (0 = byte, 1 = short, 2 = long) */ 1207 16, /* bitsize */ 1208 FALSE, /* pc_relative */ 1209 0, /* bitpos */ 1210 complain_overflow_dont, /* complain_on_overflow */ 1211 ppc64_elf_toc_reloc, /* special_function */ 1212 "R_PPC64_TOC16_LO_DS", /* name */ 1213 FALSE, /* partial_inplace */ 1214 0, /* src_mask */ 1215 0xfffc, /* dst_mask */ 1216 FALSE), /* pcrel_offset */ 1217 1218 /* Like R_PPC64_PLTGOT16, but for instructions with a DS field. */ 1219 /* FIXME: R_PPC64_PLTGOT16_DS not implemented. */ 1220 HOWTO (R_PPC64_PLTGOT16_DS, /* type */ 1221 0, /* rightshift */ 1222 1, /* size (0 = byte, 1 = short, 2 = long) */ 1223 16, /* bitsize */ 1224 FALSE, /* pc_relative */ 1225 0, /* bitpos */ 1226 complain_overflow_signed, /* complain_on_overflow */ 1227 ppc64_elf_unhandled_reloc, /* special_function */ 1228 "R_PPC64_PLTGOT16_DS", /* name */ 1229 FALSE, /* partial_inplace */ 1230 0, /* src_mask */ 1231 0xfffc, /* dst_mask */ 1232 FALSE), /* pcrel_offset */ 1233 1234 /* Like R_PPC64_PLTGOT16_LO, but for instructions with a DS field. */ 1235 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */ 1236 HOWTO (R_PPC64_PLTGOT16_LO_DS,/* type */ 1237 0, /* rightshift */ 1238 1, /* size (0 = byte, 1 = short, 2 = long) */ 1239 16, /* bitsize */ 1240 FALSE, /* pc_relative */ 1241 0, /* bitpos */ 1242 complain_overflow_dont, /* complain_on_overflow */ 1243 ppc64_elf_unhandled_reloc, /* special_function */ 1244 "R_PPC64_PLTGOT16_LO_DS",/* name */ 1245 FALSE, /* partial_inplace */ 1246 0, /* src_mask */ 1247 0xfffc, /* dst_mask */ 1248 FALSE), /* pcrel_offset */ 1249 1250 /* Marker relocs for TLS. */ 1251 HOWTO (R_PPC64_TLS, 1252 0, /* rightshift */ 1253 2, /* size (0 = byte, 1 = short, 2 = long) */ 1254 32, /* bitsize */ 1255 FALSE, /* pc_relative */ 1256 0, /* bitpos */ 1257 complain_overflow_dont, /* complain_on_overflow */ 1258 bfd_elf_generic_reloc, /* special_function */ 1259 "R_PPC64_TLS", /* name */ 1260 FALSE, /* partial_inplace */ 1261 0, /* src_mask */ 1262 0, /* dst_mask */ 1263 FALSE), /* pcrel_offset */ 1264 1265 HOWTO (R_PPC64_TLSGD, 1266 0, /* rightshift */ 1267 2, /* size (0 = byte, 1 = short, 2 = long) */ 1268 32, /* bitsize */ 1269 FALSE, /* pc_relative */ 1270 0, /* bitpos */ 1271 complain_overflow_dont, /* complain_on_overflow */ 1272 bfd_elf_generic_reloc, /* special_function */ 1273 "R_PPC64_TLSGD", /* name */ 1274 FALSE, /* partial_inplace */ 1275 0, /* src_mask */ 1276 0, /* dst_mask */ 1277 FALSE), /* pcrel_offset */ 1278 1279 HOWTO (R_PPC64_TLSLD, 1280 0, /* rightshift */ 1281 2, /* size (0 = byte, 1 = short, 2 = long) */ 1282 32, /* bitsize */ 1283 FALSE, /* pc_relative */ 1284 0, /* bitpos */ 1285 complain_overflow_dont, /* complain_on_overflow */ 1286 bfd_elf_generic_reloc, /* special_function */ 1287 "R_PPC64_TLSLD", /* name */ 1288 FALSE, /* partial_inplace */ 1289 0, /* src_mask */ 1290 0, /* dst_mask */ 1291 FALSE), /* pcrel_offset */ 1292 1293 HOWTO (R_PPC64_TOCSAVE, 1294 0, /* rightshift */ 1295 2, /* size (0 = byte, 1 = short, 2 = long) */ 1296 32, /* bitsize */ 1297 FALSE, /* pc_relative */ 1298 0, /* bitpos */ 1299 complain_overflow_dont, /* complain_on_overflow */ 1300 bfd_elf_generic_reloc, /* special_function */ 1301 "R_PPC64_TOCSAVE", /* name */ 1302 FALSE, /* partial_inplace */ 1303 0, /* src_mask */ 1304 0, /* dst_mask */ 1305 FALSE), /* pcrel_offset */ 1306 1307 /* Computes the load module index of the load module that contains the 1308 definition of its TLS sym. */ 1309 HOWTO (R_PPC64_DTPMOD64, 1310 0, /* rightshift */ 1311 4, /* size (0 = byte, 1 = short, 2 = long) */ 1312 64, /* bitsize */ 1313 FALSE, /* pc_relative */ 1314 0, /* bitpos */ 1315 complain_overflow_dont, /* complain_on_overflow */ 1316 ppc64_elf_unhandled_reloc, /* special_function */ 1317 "R_PPC64_DTPMOD64", /* name */ 1318 FALSE, /* partial_inplace */ 1319 0, /* src_mask */ 1320 ONES (64), /* dst_mask */ 1321 FALSE), /* pcrel_offset */ 1322 1323 /* Computes a dtv-relative displacement, the difference between the value 1324 of sym+add and the base address of the thread-local storage block that 1325 contains the definition of sym, minus 0x8000. */ 1326 HOWTO (R_PPC64_DTPREL64, 1327 0, /* rightshift */ 1328 4, /* size (0 = byte, 1 = short, 2 = long) */ 1329 64, /* bitsize */ 1330 FALSE, /* pc_relative */ 1331 0, /* bitpos */ 1332 complain_overflow_dont, /* complain_on_overflow */ 1333 ppc64_elf_unhandled_reloc, /* special_function */ 1334 "R_PPC64_DTPREL64", /* name */ 1335 FALSE, /* partial_inplace */ 1336 0, /* src_mask */ 1337 ONES (64), /* dst_mask */ 1338 FALSE), /* pcrel_offset */ 1339 1340 /* A 16 bit dtprel reloc. */ 1341 HOWTO (R_PPC64_DTPREL16, 1342 0, /* rightshift */ 1343 1, /* size (0 = byte, 1 = short, 2 = long) */ 1344 16, /* bitsize */ 1345 FALSE, /* pc_relative */ 1346 0, /* bitpos */ 1347 complain_overflow_signed, /* complain_on_overflow */ 1348 ppc64_elf_unhandled_reloc, /* special_function */ 1349 "R_PPC64_DTPREL16", /* name */ 1350 FALSE, /* partial_inplace */ 1351 0, /* src_mask */ 1352 0xffff, /* dst_mask */ 1353 FALSE), /* pcrel_offset */ 1354 1355 /* Like DTPREL16, but no overflow. */ 1356 HOWTO (R_PPC64_DTPREL16_LO, 1357 0, /* rightshift */ 1358 1, /* size (0 = byte, 1 = short, 2 = long) */ 1359 16, /* bitsize */ 1360 FALSE, /* pc_relative */ 1361 0, /* bitpos */ 1362 complain_overflow_dont, /* complain_on_overflow */ 1363 ppc64_elf_unhandled_reloc, /* special_function */ 1364 "R_PPC64_DTPREL16_LO", /* name */ 1365 FALSE, /* partial_inplace */ 1366 0, /* src_mask */ 1367 0xffff, /* dst_mask */ 1368 FALSE), /* pcrel_offset */ 1369 1370 /* Like DTPREL16_LO, but next higher group of 16 bits. */ 1371 HOWTO (R_PPC64_DTPREL16_HI, 1372 16, /* rightshift */ 1373 1, /* size (0 = byte, 1 = short, 2 = long) */ 1374 16, /* bitsize */ 1375 FALSE, /* pc_relative */ 1376 0, /* bitpos */ 1377 complain_overflow_dont, /* complain_on_overflow */ 1378 ppc64_elf_unhandled_reloc, /* special_function */ 1379 "R_PPC64_DTPREL16_HI", /* name */ 1380 FALSE, /* partial_inplace */ 1381 0, /* src_mask */ 1382 0xffff, /* dst_mask */ 1383 FALSE), /* pcrel_offset */ 1384 1385 /* Like DTPREL16_HI, but adjust for low 16 bits. */ 1386 HOWTO (R_PPC64_DTPREL16_HA, 1387 16, /* rightshift */ 1388 1, /* size (0 = byte, 1 = short, 2 = long) */ 1389 16, /* bitsize */ 1390 FALSE, /* pc_relative */ 1391 0, /* bitpos */ 1392 complain_overflow_dont, /* complain_on_overflow */ 1393 ppc64_elf_unhandled_reloc, /* special_function */ 1394 "R_PPC64_DTPREL16_HA", /* name */ 1395 FALSE, /* partial_inplace */ 1396 0, /* src_mask */ 1397 0xffff, /* dst_mask */ 1398 FALSE), /* pcrel_offset */ 1399 1400 /* Like DTPREL16_HI, but next higher group of 16 bits. */ 1401 HOWTO (R_PPC64_DTPREL16_HIGHER, 1402 32, /* rightshift */ 1403 1, /* size (0 = byte, 1 = short, 2 = long) */ 1404 16, /* bitsize */ 1405 FALSE, /* pc_relative */ 1406 0, /* bitpos */ 1407 complain_overflow_dont, /* complain_on_overflow */ 1408 ppc64_elf_unhandled_reloc, /* special_function */ 1409 "R_PPC64_DTPREL16_HIGHER", /* name */ 1410 FALSE, /* partial_inplace */ 1411 0, /* src_mask */ 1412 0xffff, /* dst_mask */ 1413 FALSE), /* pcrel_offset */ 1414 1415 /* Like DTPREL16_HIGHER, but adjust for low 16 bits. */ 1416 HOWTO (R_PPC64_DTPREL16_HIGHERA, 1417 32, /* rightshift */ 1418 1, /* size (0 = byte, 1 = short, 2 = long) */ 1419 16, /* bitsize */ 1420 FALSE, /* pc_relative */ 1421 0, /* bitpos */ 1422 complain_overflow_dont, /* complain_on_overflow */ 1423 ppc64_elf_unhandled_reloc, /* special_function */ 1424 "R_PPC64_DTPREL16_HIGHERA", /* name */ 1425 FALSE, /* partial_inplace */ 1426 0, /* src_mask */ 1427 0xffff, /* dst_mask */ 1428 FALSE), /* pcrel_offset */ 1429 1430 /* Like DTPREL16_HIGHER, but next higher group of 16 bits. */ 1431 HOWTO (R_PPC64_DTPREL16_HIGHEST, 1432 48, /* rightshift */ 1433 1, /* size (0 = byte, 1 = short, 2 = long) */ 1434 16, /* bitsize */ 1435 FALSE, /* pc_relative */ 1436 0, /* bitpos */ 1437 complain_overflow_dont, /* complain_on_overflow */ 1438 ppc64_elf_unhandled_reloc, /* special_function */ 1439 "R_PPC64_DTPREL16_HIGHEST", /* name */ 1440 FALSE, /* partial_inplace */ 1441 0, /* src_mask */ 1442 0xffff, /* dst_mask */ 1443 FALSE), /* pcrel_offset */ 1444 1445 /* Like DTPREL16_HIGHEST, but adjust for low 16 bits. */ 1446 HOWTO (R_PPC64_DTPREL16_HIGHESTA, 1447 48, /* rightshift */ 1448 1, /* size (0 = byte, 1 = short, 2 = long) */ 1449 16, /* bitsize */ 1450 FALSE, /* pc_relative */ 1451 0, /* bitpos */ 1452 complain_overflow_dont, /* complain_on_overflow */ 1453 ppc64_elf_unhandled_reloc, /* special_function */ 1454 "R_PPC64_DTPREL16_HIGHESTA", /* name */ 1455 FALSE, /* partial_inplace */ 1456 0, /* src_mask */ 1457 0xffff, /* dst_mask */ 1458 FALSE), /* pcrel_offset */ 1459 1460 /* Like DTPREL16, but for insns with a DS field. */ 1461 HOWTO (R_PPC64_DTPREL16_DS, 1462 0, /* rightshift */ 1463 1, /* size (0 = byte, 1 = short, 2 = long) */ 1464 16, /* bitsize */ 1465 FALSE, /* pc_relative */ 1466 0, /* bitpos */ 1467 complain_overflow_signed, /* complain_on_overflow */ 1468 ppc64_elf_unhandled_reloc, /* special_function */ 1469 "R_PPC64_DTPREL16_DS", /* name */ 1470 FALSE, /* partial_inplace */ 1471 0, /* src_mask */ 1472 0xfffc, /* dst_mask */ 1473 FALSE), /* pcrel_offset */ 1474 1475 /* Like DTPREL16_DS, but no overflow. */ 1476 HOWTO (R_PPC64_DTPREL16_LO_DS, 1477 0, /* rightshift */ 1478 1, /* size (0 = byte, 1 = short, 2 = long) */ 1479 16, /* bitsize */ 1480 FALSE, /* pc_relative */ 1481 0, /* bitpos */ 1482 complain_overflow_dont, /* complain_on_overflow */ 1483 ppc64_elf_unhandled_reloc, /* special_function */ 1484 "R_PPC64_DTPREL16_LO_DS", /* name */ 1485 FALSE, /* partial_inplace */ 1486 0, /* src_mask */ 1487 0xfffc, /* dst_mask */ 1488 FALSE), /* pcrel_offset */ 1489 1490 /* Computes a tp-relative displacement, the difference between the value of 1491 sym+add and the value of the thread pointer (r13). */ 1492 HOWTO (R_PPC64_TPREL64, 1493 0, /* rightshift */ 1494 4, /* size (0 = byte, 1 = short, 2 = long) */ 1495 64, /* bitsize */ 1496 FALSE, /* pc_relative */ 1497 0, /* bitpos */ 1498 complain_overflow_dont, /* complain_on_overflow */ 1499 ppc64_elf_unhandled_reloc, /* special_function */ 1500 "R_PPC64_TPREL64", /* name */ 1501 FALSE, /* partial_inplace */ 1502 0, /* src_mask */ 1503 ONES (64), /* dst_mask */ 1504 FALSE), /* pcrel_offset */ 1505 1506 /* A 16 bit tprel reloc. */ 1507 HOWTO (R_PPC64_TPREL16, 1508 0, /* rightshift */ 1509 1, /* size (0 = byte, 1 = short, 2 = long) */ 1510 16, /* bitsize */ 1511 FALSE, /* pc_relative */ 1512 0, /* bitpos */ 1513 complain_overflow_signed, /* complain_on_overflow */ 1514 ppc64_elf_unhandled_reloc, /* special_function */ 1515 "R_PPC64_TPREL16", /* name */ 1516 FALSE, /* partial_inplace */ 1517 0, /* src_mask */ 1518 0xffff, /* dst_mask */ 1519 FALSE), /* pcrel_offset */ 1520 1521 /* Like TPREL16, but no overflow. */ 1522 HOWTO (R_PPC64_TPREL16_LO, 1523 0, /* rightshift */ 1524 1, /* size (0 = byte, 1 = short, 2 = long) */ 1525 16, /* bitsize */ 1526 FALSE, /* pc_relative */ 1527 0, /* bitpos */ 1528 complain_overflow_dont, /* complain_on_overflow */ 1529 ppc64_elf_unhandled_reloc, /* special_function */ 1530 "R_PPC64_TPREL16_LO", /* name */ 1531 FALSE, /* partial_inplace */ 1532 0, /* src_mask */ 1533 0xffff, /* dst_mask */ 1534 FALSE), /* pcrel_offset */ 1535 1536 /* Like TPREL16_LO, but next higher group of 16 bits. */ 1537 HOWTO (R_PPC64_TPREL16_HI, 1538 16, /* rightshift */ 1539 1, /* size (0 = byte, 1 = short, 2 = long) */ 1540 16, /* bitsize */ 1541 FALSE, /* pc_relative */ 1542 0, /* bitpos */ 1543 complain_overflow_dont, /* complain_on_overflow */ 1544 ppc64_elf_unhandled_reloc, /* special_function */ 1545 "R_PPC64_TPREL16_HI", /* name */ 1546 FALSE, /* partial_inplace */ 1547 0, /* src_mask */ 1548 0xffff, /* dst_mask */ 1549 FALSE), /* pcrel_offset */ 1550 1551 /* Like TPREL16_HI, but adjust for low 16 bits. */ 1552 HOWTO (R_PPC64_TPREL16_HA, 1553 16, /* rightshift */ 1554 1, /* size (0 = byte, 1 = short, 2 = long) */ 1555 16, /* bitsize */ 1556 FALSE, /* pc_relative */ 1557 0, /* bitpos */ 1558 complain_overflow_dont, /* complain_on_overflow */ 1559 ppc64_elf_unhandled_reloc, /* special_function */ 1560 "R_PPC64_TPREL16_HA", /* name */ 1561 FALSE, /* partial_inplace */ 1562 0, /* src_mask */ 1563 0xffff, /* dst_mask */ 1564 FALSE), /* pcrel_offset */ 1565 1566 /* Like TPREL16_HI, but next higher group of 16 bits. */ 1567 HOWTO (R_PPC64_TPREL16_HIGHER, 1568 32, /* rightshift */ 1569 1, /* size (0 = byte, 1 = short, 2 = long) */ 1570 16, /* bitsize */ 1571 FALSE, /* pc_relative */ 1572 0, /* bitpos */ 1573 complain_overflow_dont, /* complain_on_overflow */ 1574 ppc64_elf_unhandled_reloc, /* special_function */ 1575 "R_PPC64_TPREL16_HIGHER", /* name */ 1576 FALSE, /* partial_inplace */ 1577 0, /* src_mask */ 1578 0xffff, /* dst_mask */ 1579 FALSE), /* pcrel_offset */ 1580 1581 /* Like TPREL16_HIGHER, but adjust for low 16 bits. */ 1582 HOWTO (R_PPC64_TPREL16_HIGHERA, 1583 32, /* rightshift */ 1584 1, /* size (0 = byte, 1 = short, 2 = long) */ 1585 16, /* bitsize */ 1586 FALSE, /* pc_relative */ 1587 0, /* bitpos */ 1588 complain_overflow_dont, /* complain_on_overflow */ 1589 ppc64_elf_unhandled_reloc, /* special_function */ 1590 "R_PPC64_TPREL16_HIGHERA", /* name */ 1591 FALSE, /* partial_inplace */ 1592 0, /* src_mask */ 1593 0xffff, /* dst_mask */ 1594 FALSE), /* pcrel_offset */ 1595 1596 /* Like TPREL16_HIGHER, but next higher group of 16 bits. */ 1597 HOWTO (R_PPC64_TPREL16_HIGHEST, 1598 48, /* rightshift */ 1599 1, /* size (0 = byte, 1 = short, 2 = long) */ 1600 16, /* bitsize */ 1601 FALSE, /* pc_relative */ 1602 0, /* bitpos */ 1603 complain_overflow_dont, /* complain_on_overflow */ 1604 ppc64_elf_unhandled_reloc, /* special_function */ 1605 "R_PPC64_TPREL16_HIGHEST", /* name */ 1606 FALSE, /* partial_inplace */ 1607 0, /* src_mask */ 1608 0xffff, /* dst_mask */ 1609 FALSE), /* pcrel_offset */ 1610 1611 /* Like TPREL16_HIGHEST, but adjust for low 16 bits. */ 1612 HOWTO (R_PPC64_TPREL16_HIGHESTA, 1613 48, /* rightshift */ 1614 1, /* size (0 = byte, 1 = short, 2 = long) */ 1615 16, /* bitsize */ 1616 FALSE, /* pc_relative */ 1617 0, /* bitpos */ 1618 complain_overflow_dont, /* complain_on_overflow */ 1619 ppc64_elf_unhandled_reloc, /* special_function */ 1620 "R_PPC64_TPREL16_HIGHESTA", /* name */ 1621 FALSE, /* partial_inplace */ 1622 0, /* src_mask */ 1623 0xffff, /* dst_mask */ 1624 FALSE), /* pcrel_offset */ 1625 1626 /* Like TPREL16, but for insns with a DS field. */ 1627 HOWTO (R_PPC64_TPREL16_DS, 1628 0, /* rightshift */ 1629 1, /* size (0 = byte, 1 = short, 2 = long) */ 1630 16, /* bitsize */ 1631 FALSE, /* pc_relative */ 1632 0, /* bitpos */ 1633 complain_overflow_signed, /* complain_on_overflow */ 1634 ppc64_elf_unhandled_reloc, /* special_function */ 1635 "R_PPC64_TPREL16_DS", /* name */ 1636 FALSE, /* partial_inplace */ 1637 0, /* src_mask */ 1638 0xfffc, /* dst_mask */ 1639 FALSE), /* pcrel_offset */ 1640 1641 /* Like TPREL16_DS, but no overflow. */ 1642 HOWTO (R_PPC64_TPREL16_LO_DS, 1643 0, /* rightshift */ 1644 1, /* size (0 = byte, 1 = short, 2 = long) */ 1645 16, /* bitsize */ 1646 FALSE, /* pc_relative */ 1647 0, /* bitpos */ 1648 complain_overflow_dont, /* complain_on_overflow */ 1649 ppc64_elf_unhandled_reloc, /* special_function */ 1650 "R_PPC64_TPREL16_LO_DS", /* name */ 1651 FALSE, /* partial_inplace */ 1652 0, /* src_mask */ 1653 0xfffc, /* dst_mask */ 1654 FALSE), /* pcrel_offset */ 1655 1656 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 1657 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset 1658 to the first entry relative to the TOC base (r2). */ 1659 HOWTO (R_PPC64_GOT_TLSGD16, 1660 0, /* rightshift */ 1661 1, /* size (0 = byte, 1 = short, 2 = long) */ 1662 16, /* bitsize */ 1663 FALSE, /* pc_relative */ 1664 0, /* bitpos */ 1665 complain_overflow_signed, /* complain_on_overflow */ 1666 ppc64_elf_unhandled_reloc, /* special_function */ 1667 "R_PPC64_GOT_TLSGD16", /* name */ 1668 FALSE, /* partial_inplace */ 1669 0, /* src_mask */ 1670 0xffff, /* dst_mask */ 1671 FALSE), /* pcrel_offset */ 1672 1673 /* Like GOT_TLSGD16, but no overflow. */ 1674 HOWTO (R_PPC64_GOT_TLSGD16_LO, 1675 0, /* rightshift */ 1676 1, /* size (0 = byte, 1 = short, 2 = long) */ 1677 16, /* bitsize */ 1678 FALSE, /* pc_relative */ 1679 0, /* bitpos */ 1680 complain_overflow_dont, /* complain_on_overflow */ 1681 ppc64_elf_unhandled_reloc, /* special_function */ 1682 "R_PPC64_GOT_TLSGD16_LO", /* name */ 1683 FALSE, /* partial_inplace */ 1684 0, /* src_mask */ 1685 0xffff, /* dst_mask */ 1686 FALSE), /* pcrel_offset */ 1687 1688 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */ 1689 HOWTO (R_PPC64_GOT_TLSGD16_HI, 1690 16, /* rightshift */ 1691 1, /* size (0 = byte, 1 = short, 2 = long) */ 1692 16, /* bitsize */ 1693 FALSE, /* pc_relative */ 1694 0, /* bitpos */ 1695 complain_overflow_dont, /* complain_on_overflow */ 1696 ppc64_elf_unhandled_reloc, /* special_function */ 1697 "R_PPC64_GOT_TLSGD16_HI", /* name */ 1698 FALSE, /* partial_inplace */ 1699 0, /* src_mask */ 1700 0xffff, /* dst_mask */ 1701 FALSE), /* pcrel_offset */ 1702 1703 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */ 1704 HOWTO (R_PPC64_GOT_TLSGD16_HA, 1705 16, /* rightshift */ 1706 1, /* size (0 = byte, 1 = short, 2 = long) */ 1707 16, /* bitsize */ 1708 FALSE, /* pc_relative */ 1709 0, /* bitpos */ 1710 complain_overflow_dont, /* complain_on_overflow */ 1711 ppc64_elf_unhandled_reloc, /* special_function */ 1712 "R_PPC64_GOT_TLSGD16_HA", /* name */ 1713 FALSE, /* partial_inplace */ 1714 0, /* src_mask */ 1715 0xffff, /* dst_mask */ 1716 FALSE), /* pcrel_offset */ 1717 1718 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 1719 with values (sym+add)@dtpmod and zero, and computes the offset to the 1720 first entry relative to the TOC base (r2). */ 1721 HOWTO (R_PPC64_GOT_TLSLD16, 1722 0, /* rightshift */ 1723 1, /* size (0 = byte, 1 = short, 2 = long) */ 1724 16, /* bitsize */ 1725 FALSE, /* pc_relative */ 1726 0, /* bitpos */ 1727 complain_overflow_signed, /* complain_on_overflow */ 1728 ppc64_elf_unhandled_reloc, /* special_function */ 1729 "R_PPC64_GOT_TLSLD16", /* name */ 1730 FALSE, /* partial_inplace */ 1731 0, /* src_mask */ 1732 0xffff, /* dst_mask */ 1733 FALSE), /* pcrel_offset */ 1734 1735 /* Like GOT_TLSLD16, but no overflow. */ 1736 HOWTO (R_PPC64_GOT_TLSLD16_LO, 1737 0, /* rightshift */ 1738 1, /* size (0 = byte, 1 = short, 2 = long) */ 1739 16, /* bitsize */ 1740 FALSE, /* pc_relative */ 1741 0, /* bitpos */ 1742 complain_overflow_dont, /* complain_on_overflow */ 1743 ppc64_elf_unhandled_reloc, /* special_function */ 1744 "R_PPC64_GOT_TLSLD16_LO", /* name */ 1745 FALSE, /* partial_inplace */ 1746 0, /* src_mask */ 1747 0xffff, /* dst_mask */ 1748 FALSE), /* pcrel_offset */ 1749 1750 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */ 1751 HOWTO (R_PPC64_GOT_TLSLD16_HI, 1752 16, /* rightshift */ 1753 1, /* size (0 = byte, 1 = short, 2 = long) */ 1754 16, /* bitsize */ 1755 FALSE, /* pc_relative */ 1756 0, /* bitpos */ 1757 complain_overflow_dont, /* complain_on_overflow */ 1758 ppc64_elf_unhandled_reloc, /* special_function */ 1759 "R_PPC64_GOT_TLSLD16_HI", /* name */ 1760 FALSE, /* partial_inplace */ 1761 0, /* src_mask */ 1762 0xffff, /* dst_mask */ 1763 FALSE), /* pcrel_offset */ 1764 1765 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */ 1766 HOWTO (R_PPC64_GOT_TLSLD16_HA, 1767 16, /* rightshift */ 1768 1, /* size (0 = byte, 1 = short, 2 = long) */ 1769 16, /* bitsize */ 1770 FALSE, /* pc_relative */ 1771 0, /* bitpos */ 1772 complain_overflow_dont, /* complain_on_overflow */ 1773 ppc64_elf_unhandled_reloc, /* special_function */ 1774 "R_PPC64_GOT_TLSLD16_HA", /* name */ 1775 FALSE, /* partial_inplace */ 1776 0, /* src_mask */ 1777 0xffff, /* dst_mask */ 1778 FALSE), /* pcrel_offset */ 1779 1780 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes 1781 the offset to the entry relative to the TOC base (r2). */ 1782 HOWTO (R_PPC64_GOT_DTPREL16_DS, 1783 0, /* rightshift */ 1784 1, /* size (0 = byte, 1 = short, 2 = long) */ 1785 16, /* bitsize */ 1786 FALSE, /* pc_relative */ 1787 0, /* bitpos */ 1788 complain_overflow_signed, /* complain_on_overflow */ 1789 ppc64_elf_unhandled_reloc, /* special_function */ 1790 "R_PPC64_GOT_DTPREL16_DS", /* name */ 1791 FALSE, /* partial_inplace */ 1792 0, /* src_mask */ 1793 0xfffc, /* dst_mask */ 1794 FALSE), /* pcrel_offset */ 1795 1796 /* Like GOT_DTPREL16_DS, but no overflow. */ 1797 HOWTO (R_PPC64_GOT_DTPREL16_LO_DS, 1798 0, /* rightshift */ 1799 1, /* size (0 = byte, 1 = short, 2 = long) */ 1800 16, /* bitsize */ 1801 FALSE, /* pc_relative */ 1802 0, /* bitpos */ 1803 complain_overflow_dont, /* complain_on_overflow */ 1804 ppc64_elf_unhandled_reloc, /* special_function */ 1805 "R_PPC64_GOT_DTPREL16_LO_DS", /* name */ 1806 FALSE, /* partial_inplace */ 1807 0, /* src_mask */ 1808 0xfffc, /* dst_mask */ 1809 FALSE), /* pcrel_offset */ 1810 1811 /* Like GOT_DTPREL16_LO_DS, but next higher group of 16 bits. */ 1812 HOWTO (R_PPC64_GOT_DTPREL16_HI, 1813 16, /* rightshift */ 1814 1, /* size (0 = byte, 1 = short, 2 = long) */ 1815 16, /* bitsize */ 1816 FALSE, /* pc_relative */ 1817 0, /* bitpos */ 1818 complain_overflow_dont, /* complain_on_overflow */ 1819 ppc64_elf_unhandled_reloc, /* special_function */ 1820 "R_PPC64_GOT_DTPREL16_HI", /* name */ 1821 FALSE, /* partial_inplace */ 1822 0, /* src_mask */ 1823 0xffff, /* dst_mask */ 1824 FALSE), /* pcrel_offset */ 1825 1826 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */ 1827 HOWTO (R_PPC64_GOT_DTPREL16_HA, 1828 16, /* rightshift */ 1829 1, /* size (0 = byte, 1 = short, 2 = long) */ 1830 16, /* bitsize */ 1831 FALSE, /* pc_relative */ 1832 0, /* bitpos */ 1833 complain_overflow_dont, /* complain_on_overflow */ 1834 ppc64_elf_unhandled_reloc, /* special_function */ 1835 "R_PPC64_GOT_DTPREL16_HA", /* name */ 1836 FALSE, /* partial_inplace */ 1837 0, /* src_mask */ 1838 0xffff, /* dst_mask */ 1839 FALSE), /* pcrel_offset */ 1840 1841 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the 1842 offset to the entry relative to the TOC base (r2). */ 1843 HOWTO (R_PPC64_GOT_TPREL16_DS, 1844 0, /* rightshift */ 1845 1, /* size (0 = byte, 1 = short, 2 = long) */ 1846 16, /* bitsize */ 1847 FALSE, /* pc_relative */ 1848 0, /* bitpos */ 1849 complain_overflow_signed, /* complain_on_overflow */ 1850 ppc64_elf_unhandled_reloc, /* special_function */ 1851 "R_PPC64_GOT_TPREL16_DS", /* name */ 1852 FALSE, /* partial_inplace */ 1853 0, /* src_mask */ 1854 0xfffc, /* dst_mask */ 1855 FALSE), /* pcrel_offset */ 1856 1857 /* Like GOT_TPREL16_DS, but no overflow. */ 1858 HOWTO (R_PPC64_GOT_TPREL16_LO_DS, 1859 0, /* rightshift */ 1860 1, /* size (0 = byte, 1 = short, 2 = long) */ 1861 16, /* bitsize */ 1862 FALSE, /* pc_relative */ 1863 0, /* bitpos */ 1864 complain_overflow_dont, /* complain_on_overflow */ 1865 ppc64_elf_unhandled_reloc, /* special_function */ 1866 "R_PPC64_GOT_TPREL16_LO_DS", /* name */ 1867 FALSE, /* partial_inplace */ 1868 0, /* src_mask */ 1869 0xfffc, /* dst_mask */ 1870 FALSE), /* pcrel_offset */ 1871 1872 /* Like GOT_TPREL16_LO_DS, but next higher group of 16 bits. */ 1873 HOWTO (R_PPC64_GOT_TPREL16_HI, 1874 16, /* rightshift */ 1875 1, /* size (0 = byte, 1 = short, 2 = long) */ 1876 16, /* bitsize */ 1877 FALSE, /* pc_relative */ 1878 0, /* bitpos */ 1879 complain_overflow_dont, /* complain_on_overflow */ 1880 ppc64_elf_unhandled_reloc, /* special_function */ 1881 "R_PPC64_GOT_TPREL16_HI", /* name */ 1882 FALSE, /* partial_inplace */ 1883 0, /* src_mask */ 1884 0xffff, /* dst_mask */ 1885 FALSE), /* pcrel_offset */ 1886 1887 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */ 1888 HOWTO (R_PPC64_GOT_TPREL16_HA, 1889 16, /* rightshift */ 1890 1, /* size (0 = byte, 1 = short, 2 = long) */ 1891 16, /* bitsize */ 1892 FALSE, /* pc_relative */ 1893 0, /* bitpos */ 1894 complain_overflow_dont, /* complain_on_overflow */ 1895 ppc64_elf_unhandled_reloc, /* special_function */ 1896 "R_PPC64_GOT_TPREL16_HA", /* name */ 1897 FALSE, /* partial_inplace */ 1898 0, /* src_mask */ 1899 0xffff, /* dst_mask */ 1900 FALSE), /* pcrel_offset */ 1901 1902 HOWTO (R_PPC64_JMP_IREL, /* type */ 1903 0, /* rightshift */ 1904 0, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 1905 0, /* bitsize */ 1906 FALSE, /* pc_relative */ 1907 0, /* bitpos */ 1908 complain_overflow_dont, /* complain_on_overflow */ 1909 ppc64_elf_unhandled_reloc, /* special_function */ 1910 "R_PPC64_JMP_IREL", /* name */ 1911 FALSE, /* partial_inplace */ 1912 0, /* src_mask */ 1913 0, /* dst_mask */ 1914 FALSE), /* pcrel_offset */ 1915 1916 HOWTO (R_PPC64_IRELATIVE, /* type */ 1917 0, /* rightshift */ 1918 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 1919 64, /* bitsize */ 1920 FALSE, /* pc_relative */ 1921 0, /* bitpos */ 1922 complain_overflow_dont, /* complain_on_overflow */ 1923 bfd_elf_generic_reloc, /* special_function */ 1924 "R_PPC64_IRELATIVE", /* name */ 1925 FALSE, /* partial_inplace */ 1926 0, /* src_mask */ 1927 ONES (64), /* dst_mask */ 1928 FALSE), /* pcrel_offset */ 1929 1930 /* A 16 bit relative relocation. */ 1931 HOWTO (R_PPC64_REL16, /* type */ 1932 0, /* rightshift */ 1933 1, /* size (0 = byte, 1 = short, 2 = long) */ 1934 16, /* bitsize */ 1935 TRUE, /* pc_relative */ 1936 0, /* bitpos */ 1937 complain_overflow_bitfield, /* complain_on_overflow */ 1938 bfd_elf_generic_reloc, /* special_function */ 1939 "R_PPC64_REL16", /* name */ 1940 FALSE, /* partial_inplace */ 1941 0, /* src_mask */ 1942 0xffff, /* dst_mask */ 1943 TRUE), /* pcrel_offset */ 1944 1945 /* A 16 bit relative relocation without overflow. */ 1946 HOWTO (R_PPC64_REL16_LO, /* type */ 1947 0, /* rightshift */ 1948 1, /* size (0 = byte, 1 = short, 2 = long) */ 1949 16, /* bitsize */ 1950 TRUE, /* pc_relative */ 1951 0, /* bitpos */ 1952 complain_overflow_dont,/* complain_on_overflow */ 1953 bfd_elf_generic_reloc, /* special_function */ 1954 "R_PPC64_REL16_LO", /* name */ 1955 FALSE, /* partial_inplace */ 1956 0, /* src_mask */ 1957 0xffff, /* dst_mask */ 1958 TRUE), /* pcrel_offset */ 1959 1960 /* The high order 16 bits of a relative address. */ 1961 HOWTO (R_PPC64_REL16_HI, /* type */ 1962 16, /* rightshift */ 1963 1, /* size (0 = byte, 1 = short, 2 = long) */ 1964 16, /* bitsize */ 1965 TRUE, /* pc_relative */ 1966 0, /* bitpos */ 1967 complain_overflow_dont, /* complain_on_overflow */ 1968 bfd_elf_generic_reloc, /* special_function */ 1969 "R_PPC64_REL16_HI", /* name */ 1970 FALSE, /* partial_inplace */ 1971 0, /* src_mask */ 1972 0xffff, /* dst_mask */ 1973 TRUE), /* pcrel_offset */ 1974 1975 /* The high order 16 bits of a relative address, plus 1 if the contents of 1976 the low 16 bits, treated as a signed number, is negative. */ 1977 HOWTO (R_PPC64_REL16_HA, /* type */ 1978 16, /* rightshift */ 1979 1, /* size (0 = byte, 1 = short, 2 = long) */ 1980 16, /* bitsize */ 1981 TRUE, /* pc_relative */ 1982 0, /* bitpos */ 1983 complain_overflow_dont, /* complain_on_overflow */ 1984 ppc64_elf_ha_reloc, /* special_function */ 1985 "R_PPC64_REL16_HA", /* name */ 1986 FALSE, /* partial_inplace */ 1987 0, /* src_mask */ 1988 0xffff, /* dst_mask */ 1989 TRUE), /* pcrel_offset */ 1990 1991 /* GNU extension to record C++ vtable hierarchy. */ 1992 HOWTO (R_PPC64_GNU_VTINHERIT, /* type */ 1993 0, /* rightshift */ 1994 0, /* size (0 = byte, 1 = short, 2 = long) */ 1995 0, /* bitsize */ 1996 FALSE, /* pc_relative */ 1997 0, /* bitpos */ 1998 complain_overflow_dont, /* complain_on_overflow */ 1999 NULL, /* special_function */ 2000 "R_PPC64_GNU_VTINHERIT", /* name */ 2001 FALSE, /* partial_inplace */ 2002 0, /* src_mask */ 2003 0, /* dst_mask */ 2004 FALSE), /* pcrel_offset */ 2005 2006 /* GNU extension to record C++ vtable member usage. */ 2007 HOWTO (R_PPC64_GNU_VTENTRY, /* type */ 2008 0, /* rightshift */ 2009 0, /* size (0 = byte, 1 = short, 2 = long) */ 2010 0, /* bitsize */ 2011 FALSE, /* pc_relative */ 2012 0, /* bitpos */ 2013 complain_overflow_dont, /* complain_on_overflow */ 2014 NULL, /* special_function */ 2015 "R_PPC64_GNU_VTENTRY", /* name */ 2016 FALSE, /* partial_inplace */ 2017 0, /* src_mask */ 2018 0, /* dst_mask */ 2019 FALSE), /* pcrel_offset */ 2020 }; 2021 2022 2023 /* Initialize the ppc64_elf_howto_table, so that linear accesses can 2024 be done. */ 2025 2026 static void 2027 ppc_howto_init (void) 2028 { 2029 unsigned int i, type; 2030 2031 for (i = 0; 2032 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]); 2033 i++) 2034 { 2035 type = ppc64_elf_howto_raw[i].type; 2036 BFD_ASSERT (type < (sizeof (ppc64_elf_howto_table) 2037 / sizeof (ppc64_elf_howto_table[0]))); 2038 ppc64_elf_howto_table[type] = &ppc64_elf_howto_raw[i]; 2039 } 2040 } 2041 2042 static reloc_howto_type * 2043 ppc64_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 2044 bfd_reloc_code_real_type code) 2045 { 2046 enum elf_ppc64_reloc_type r = R_PPC64_NONE; 2047 2048 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 2049 /* Initialize howto table if needed. */ 2050 ppc_howto_init (); 2051 2052 switch (code) 2053 { 2054 default: 2055 return NULL; 2056 2057 case BFD_RELOC_NONE: r = R_PPC64_NONE; 2058 break; 2059 case BFD_RELOC_32: r = R_PPC64_ADDR32; 2060 break; 2061 case BFD_RELOC_PPC_BA26: r = R_PPC64_ADDR24; 2062 break; 2063 case BFD_RELOC_16: r = R_PPC64_ADDR16; 2064 break; 2065 case BFD_RELOC_LO16: r = R_PPC64_ADDR16_LO; 2066 break; 2067 case BFD_RELOC_HI16: r = R_PPC64_ADDR16_HI; 2068 break; 2069 case BFD_RELOC_HI16_S: r = R_PPC64_ADDR16_HA; 2070 break; 2071 case BFD_RELOC_PPC_BA16: r = R_PPC64_ADDR14; 2072 break; 2073 case BFD_RELOC_PPC_BA16_BRTAKEN: r = R_PPC64_ADDR14_BRTAKEN; 2074 break; 2075 case BFD_RELOC_PPC_BA16_BRNTAKEN: r = R_PPC64_ADDR14_BRNTAKEN; 2076 break; 2077 case BFD_RELOC_PPC_B26: r = R_PPC64_REL24; 2078 break; 2079 case BFD_RELOC_PPC_B16: r = R_PPC64_REL14; 2080 break; 2081 case BFD_RELOC_PPC_B16_BRTAKEN: r = R_PPC64_REL14_BRTAKEN; 2082 break; 2083 case BFD_RELOC_PPC_B16_BRNTAKEN: r = R_PPC64_REL14_BRNTAKEN; 2084 break; 2085 case BFD_RELOC_16_GOTOFF: r = R_PPC64_GOT16; 2086 break; 2087 case BFD_RELOC_LO16_GOTOFF: r = R_PPC64_GOT16_LO; 2088 break; 2089 case BFD_RELOC_HI16_GOTOFF: r = R_PPC64_GOT16_HI; 2090 break; 2091 case BFD_RELOC_HI16_S_GOTOFF: r = R_PPC64_GOT16_HA; 2092 break; 2093 case BFD_RELOC_PPC_COPY: r = R_PPC64_COPY; 2094 break; 2095 case BFD_RELOC_PPC_GLOB_DAT: r = R_PPC64_GLOB_DAT; 2096 break; 2097 case BFD_RELOC_32_PCREL: r = R_PPC64_REL32; 2098 break; 2099 case BFD_RELOC_32_PLTOFF: r = R_PPC64_PLT32; 2100 break; 2101 case BFD_RELOC_32_PLT_PCREL: r = R_PPC64_PLTREL32; 2102 break; 2103 case BFD_RELOC_LO16_PLTOFF: r = R_PPC64_PLT16_LO; 2104 break; 2105 case BFD_RELOC_HI16_PLTOFF: r = R_PPC64_PLT16_HI; 2106 break; 2107 case BFD_RELOC_HI16_S_PLTOFF: r = R_PPC64_PLT16_HA; 2108 break; 2109 case BFD_RELOC_16_BASEREL: r = R_PPC64_SECTOFF; 2110 break; 2111 case BFD_RELOC_LO16_BASEREL: r = R_PPC64_SECTOFF_LO; 2112 break; 2113 case BFD_RELOC_HI16_BASEREL: r = R_PPC64_SECTOFF_HI; 2114 break; 2115 case BFD_RELOC_HI16_S_BASEREL: r = R_PPC64_SECTOFF_HA; 2116 break; 2117 case BFD_RELOC_CTOR: r = R_PPC64_ADDR64; 2118 break; 2119 case BFD_RELOC_64: r = R_PPC64_ADDR64; 2120 break; 2121 case BFD_RELOC_PPC64_HIGHER: r = R_PPC64_ADDR16_HIGHER; 2122 break; 2123 case BFD_RELOC_PPC64_HIGHER_S: r = R_PPC64_ADDR16_HIGHERA; 2124 break; 2125 case BFD_RELOC_PPC64_HIGHEST: r = R_PPC64_ADDR16_HIGHEST; 2126 break; 2127 case BFD_RELOC_PPC64_HIGHEST_S: r = R_PPC64_ADDR16_HIGHESTA; 2128 break; 2129 case BFD_RELOC_64_PCREL: r = R_PPC64_REL64; 2130 break; 2131 case BFD_RELOC_64_PLTOFF: r = R_PPC64_PLT64; 2132 break; 2133 case BFD_RELOC_64_PLT_PCREL: r = R_PPC64_PLTREL64; 2134 break; 2135 case BFD_RELOC_PPC_TOC16: r = R_PPC64_TOC16; 2136 break; 2137 case BFD_RELOC_PPC64_TOC16_LO: r = R_PPC64_TOC16_LO; 2138 break; 2139 case BFD_RELOC_PPC64_TOC16_HI: r = R_PPC64_TOC16_HI; 2140 break; 2141 case BFD_RELOC_PPC64_TOC16_HA: r = R_PPC64_TOC16_HA; 2142 break; 2143 case BFD_RELOC_PPC64_TOC: r = R_PPC64_TOC; 2144 break; 2145 case BFD_RELOC_PPC64_PLTGOT16: r = R_PPC64_PLTGOT16; 2146 break; 2147 case BFD_RELOC_PPC64_PLTGOT16_LO: r = R_PPC64_PLTGOT16_LO; 2148 break; 2149 case BFD_RELOC_PPC64_PLTGOT16_HI: r = R_PPC64_PLTGOT16_HI; 2150 break; 2151 case BFD_RELOC_PPC64_PLTGOT16_HA: r = R_PPC64_PLTGOT16_HA; 2152 break; 2153 case BFD_RELOC_PPC64_ADDR16_DS: r = R_PPC64_ADDR16_DS; 2154 break; 2155 case BFD_RELOC_PPC64_ADDR16_LO_DS: r = R_PPC64_ADDR16_LO_DS; 2156 break; 2157 case BFD_RELOC_PPC64_GOT16_DS: r = R_PPC64_GOT16_DS; 2158 break; 2159 case BFD_RELOC_PPC64_GOT16_LO_DS: r = R_PPC64_GOT16_LO_DS; 2160 break; 2161 case BFD_RELOC_PPC64_PLT16_LO_DS: r = R_PPC64_PLT16_LO_DS; 2162 break; 2163 case BFD_RELOC_PPC64_SECTOFF_DS: r = R_PPC64_SECTOFF_DS; 2164 break; 2165 case BFD_RELOC_PPC64_SECTOFF_LO_DS: r = R_PPC64_SECTOFF_LO_DS; 2166 break; 2167 case BFD_RELOC_PPC64_TOC16_DS: r = R_PPC64_TOC16_DS; 2168 break; 2169 case BFD_RELOC_PPC64_TOC16_LO_DS: r = R_PPC64_TOC16_LO_DS; 2170 break; 2171 case BFD_RELOC_PPC64_PLTGOT16_DS: r = R_PPC64_PLTGOT16_DS; 2172 break; 2173 case BFD_RELOC_PPC64_PLTGOT16_LO_DS: r = R_PPC64_PLTGOT16_LO_DS; 2174 break; 2175 case BFD_RELOC_PPC_TLS: r = R_PPC64_TLS; 2176 break; 2177 case BFD_RELOC_PPC_TLSGD: r = R_PPC64_TLSGD; 2178 break; 2179 case BFD_RELOC_PPC_TLSLD: r = R_PPC64_TLSLD; 2180 break; 2181 case BFD_RELOC_PPC_DTPMOD: r = R_PPC64_DTPMOD64; 2182 break; 2183 case BFD_RELOC_PPC_TPREL16: r = R_PPC64_TPREL16; 2184 break; 2185 case BFD_RELOC_PPC_TPREL16_LO: r = R_PPC64_TPREL16_LO; 2186 break; 2187 case BFD_RELOC_PPC_TPREL16_HI: r = R_PPC64_TPREL16_HI; 2188 break; 2189 case BFD_RELOC_PPC_TPREL16_HA: r = R_PPC64_TPREL16_HA; 2190 break; 2191 case BFD_RELOC_PPC_TPREL: r = R_PPC64_TPREL64; 2192 break; 2193 case BFD_RELOC_PPC_DTPREL16: r = R_PPC64_DTPREL16; 2194 break; 2195 case BFD_RELOC_PPC_DTPREL16_LO: r = R_PPC64_DTPREL16_LO; 2196 break; 2197 case BFD_RELOC_PPC_DTPREL16_HI: r = R_PPC64_DTPREL16_HI; 2198 break; 2199 case BFD_RELOC_PPC_DTPREL16_HA: r = R_PPC64_DTPREL16_HA; 2200 break; 2201 case BFD_RELOC_PPC_DTPREL: r = R_PPC64_DTPREL64; 2202 break; 2203 case BFD_RELOC_PPC_GOT_TLSGD16: r = R_PPC64_GOT_TLSGD16; 2204 break; 2205 case BFD_RELOC_PPC_GOT_TLSGD16_LO: r = R_PPC64_GOT_TLSGD16_LO; 2206 break; 2207 case BFD_RELOC_PPC_GOT_TLSGD16_HI: r = R_PPC64_GOT_TLSGD16_HI; 2208 break; 2209 case BFD_RELOC_PPC_GOT_TLSGD16_HA: r = R_PPC64_GOT_TLSGD16_HA; 2210 break; 2211 case BFD_RELOC_PPC_GOT_TLSLD16: r = R_PPC64_GOT_TLSLD16; 2212 break; 2213 case BFD_RELOC_PPC_GOT_TLSLD16_LO: r = R_PPC64_GOT_TLSLD16_LO; 2214 break; 2215 case BFD_RELOC_PPC_GOT_TLSLD16_HI: r = R_PPC64_GOT_TLSLD16_HI; 2216 break; 2217 case BFD_RELOC_PPC_GOT_TLSLD16_HA: r = R_PPC64_GOT_TLSLD16_HA; 2218 break; 2219 case BFD_RELOC_PPC_GOT_TPREL16: r = R_PPC64_GOT_TPREL16_DS; 2220 break; 2221 case BFD_RELOC_PPC_GOT_TPREL16_LO: r = R_PPC64_GOT_TPREL16_LO_DS; 2222 break; 2223 case BFD_RELOC_PPC_GOT_TPREL16_HI: r = R_PPC64_GOT_TPREL16_HI; 2224 break; 2225 case BFD_RELOC_PPC_GOT_TPREL16_HA: r = R_PPC64_GOT_TPREL16_HA; 2226 break; 2227 case BFD_RELOC_PPC_GOT_DTPREL16: r = R_PPC64_GOT_DTPREL16_DS; 2228 break; 2229 case BFD_RELOC_PPC_GOT_DTPREL16_LO: r = R_PPC64_GOT_DTPREL16_LO_DS; 2230 break; 2231 case BFD_RELOC_PPC_GOT_DTPREL16_HI: r = R_PPC64_GOT_DTPREL16_HI; 2232 break; 2233 case BFD_RELOC_PPC_GOT_DTPREL16_HA: r = R_PPC64_GOT_DTPREL16_HA; 2234 break; 2235 case BFD_RELOC_PPC64_TPREL16_DS: r = R_PPC64_TPREL16_DS; 2236 break; 2237 case BFD_RELOC_PPC64_TPREL16_LO_DS: r = R_PPC64_TPREL16_LO_DS; 2238 break; 2239 case BFD_RELOC_PPC64_TPREL16_HIGHER: r = R_PPC64_TPREL16_HIGHER; 2240 break; 2241 case BFD_RELOC_PPC64_TPREL16_HIGHERA: r = R_PPC64_TPREL16_HIGHERA; 2242 break; 2243 case BFD_RELOC_PPC64_TPREL16_HIGHEST: r = R_PPC64_TPREL16_HIGHEST; 2244 break; 2245 case BFD_RELOC_PPC64_TPREL16_HIGHESTA: r = R_PPC64_TPREL16_HIGHESTA; 2246 break; 2247 case BFD_RELOC_PPC64_DTPREL16_DS: r = R_PPC64_DTPREL16_DS; 2248 break; 2249 case BFD_RELOC_PPC64_DTPREL16_LO_DS: r = R_PPC64_DTPREL16_LO_DS; 2250 break; 2251 case BFD_RELOC_PPC64_DTPREL16_HIGHER: r = R_PPC64_DTPREL16_HIGHER; 2252 break; 2253 case BFD_RELOC_PPC64_DTPREL16_HIGHERA: r = R_PPC64_DTPREL16_HIGHERA; 2254 break; 2255 case BFD_RELOC_PPC64_DTPREL16_HIGHEST: r = R_PPC64_DTPREL16_HIGHEST; 2256 break; 2257 case BFD_RELOC_PPC64_DTPREL16_HIGHESTA: r = R_PPC64_DTPREL16_HIGHESTA; 2258 break; 2259 case BFD_RELOC_16_PCREL: r = R_PPC64_REL16; 2260 break; 2261 case BFD_RELOC_LO16_PCREL: r = R_PPC64_REL16_LO; 2262 break; 2263 case BFD_RELOC_HI16_PCREL: r = R_PPC64_REL16_HI; 2264 break; 2265 case BFD_RELOC_HI16_S_PCREL: r = R_PPC64_REL16_HA; 2266 break; 2267 case BFD_RELOC_VTABLE_INHERIT: r = R_PPC64_GNU_VTINHERIT; 2268 break; 2269 case BFD_RELOC_VTABLE_ENTRY: r = R_PPC64_GNU_VTENTRY; 2270 break; 2271 } 2272 2273 return ppc64_elf_howto_table[r]; 2274 }; 2275 2276 static reloc_howto_type * 2277 ppc64_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 2278 const char *r_name) 2279 { 2280 unsigned int i; 2281 2282 for (i = 0; 2283 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]); 2284 i++) 2285 if (ppc64_elf_howto_raw[i].name != NULL 2286 && strcasecmp (ppc64_elf_howto_raw[i].name, r_name) == 0) 2287 return &ppc64_elf_howto_raw[i]; 2288 2289 return NULL; 2290 } 2291 2292 /* Set the howto pointer for a PowerPC ELF reloc. */ 2293 2294 static void 2295 ppc64_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, 2296 Elf_Internal_Rela *dst) 2297 { 2298 unsigned int type; 2299 2300 /* Initialize howto table if needed. */ 2301 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 2302 ppc_howto_init (); 2303 2304 type = ELF64_R_TYPE (dst->r_info); 2305 if (type >= (sizeof (ppc64_elf_howto_table) 2306 / sizeof (ppc64_elf_howto_table[0]))) 2307 { 2308 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 2309 abfd, (int) type); 2310 type = R_PPC64_NONE; 2311 } 2312 cache_ptr->howto = ppc64_elf_howto_table[type]; 2313 } 2314 2315 /* Handle the R_PPC64_ADDR16_HA and similar relocs. */ 2316 2317 static bfd_reloc_status_type 2318 ppc64_elf_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2319 void *data, asection *input_section, 2320 bfd *output_bfd, char **error_message) 2321 { 2322 /* If this is a relocatable link (output_bfd test tells us), just 2323 call the generic function. Any adjustment will be done at final 2324 link time. */ 2325 if (output_bfd != NULL) 2326 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2327 input_section, output_bfd, error_message); 2328 2329 /* Adjust the addend for sign extension of the low 16 bits. 2330 We won't actually be using the low 16 bits, so trashing them 2331 doesn't matter. */ 2332 reloc_entry->addend += 0x8000; 2333 return bfd_reloc_continue; 2334 } 2335 2336 static bfd_reloc_status_type 2337 ppc64_elf_branch_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2338 void *data, asection *input_section, 2339 bfd *output_bfd, char **error_message) 2340 { 2341 if (output_bfd != NULL) 2342 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2343 input_section, output_bfd, error_message); 2344 2345 if (strcmp (symbol->section->name, ".opd") == 0 2346 && (symbol->section->owner->flags & DYNAMIC) == 0) 2347 { 2348 bfd_vma dest = opd_entry_value (symbol->section, 2349 symbol->value + reloc_entry->addend, 2350 NULL, NULL, FALSE); 2351 if (dest != (bfd_vma) -1) 2352 reloc_entry->addend = dest - (symbol->value 2353 + symbol->section->output_section->vma 2354 + symbol->section->output_offset); 2355 } 2356 return bfd_reloc_continue; 2357 } 2358 2359 static bfd_reloc_status_type 2360 ppc64_elf_brtaken_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2361 void *data, asection *input_section, 2362 bfd *output_bfd, char **error_message) 2363 { 2364 long insn; 2365 enum elf_ppc64_reloc_type r_type; 2366 bfd_size_type octets; 2367 /* Assume 'at' branch hints. */ 2368 bfd_boolean is_isa_v2 = TRUE; 2369 2370 /* If this is a relocatable link (output_bfd test tells us), just 2371 call the generic function. Any adjustment will be done at final 2372 link time. */ 2373 if (output_bfd != NULL) 2374 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2375 input_section, output_bfd, error_message); 2376 2377 octets = reloc_entry->address * bfd_octets_per_byte (abfd); 2378 insn = bfd_get_32 (abfd, (bfd_byte *) data + octets); 2379 insn &= ~(0x01 << 21); 2380 r_type = reloc_entry->howto->type; 2381 if (r_type == R_PPC64_ADDR14_BRTAKEN 2382 || r_type == R_PPC64_REL14_BRTAKEN) 2383 insn |= 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ 2384 2385 if (is_isa_v2) 2386 { 2387 /* Set 'a' bit. This is 0b00010 in BO field for branch 2388 on CR(BI) insns (BO == 001at or 011at), and 0b01000 2389 for branch on CTR insns (BO == 1a00t or 1a01t). */ 2390 if ((insn & (0x14 << 21)) == (0x04 << 21)) 2391 insn |= 0x02 << 21; 2392 else if ((insn & (0x14 << 21)) == (0x10 << 21)) 2393 insn |= 0x08 << 21; 2394 else 2395 goto out; 2396 } 2397 else 2398 { 2399 bfd_vma target = 0; 2400 bfd_vma from; 2401 2402 if (!bfd_is_com_section (symbol->section)) 2403 target = symbol->value; 2404 target += symbol->section->output_section->vma; 2405 target += symbol->section->output_offset; 2406 target += reloc_entry->addend; 2407 2408 from = (reloc_entry->address 2409 + input_section->output_offset 2410 + input_section->output_section->vma); 2411 2412 /* Invert 'y' bit if not the default. */ 2413 if ((bfd_signed_vma) (target - from) < 0) 2414 insn ^= 0x01 << 21; 2415 } 2416 bfd_put_32 (abfd, insn, (bfd_byte *) data + octets); 2417 out: 2418 return ppc64_elf_branch_reloc (abfd, reloc_entry, symbol, data, 2419 input_section, output_bfd, error_message); 2420 } 2421 2422 static bfd_reloc_status_type 2423 ppc64_elf_sectoff_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2424 void *data, asection *input_section, 2425 bfd *output_bfd, char **error_message) 2426 { 2427 /* If this is a relocatable link (output_bfd test tells us), just 2428 call the generic function. Any adjustment will be done at final 2429 link time. */ 2430 if (output_bfd != NULL) 2431 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2432 input_section, output_bfd, error_message); 2433 2434 /* Subtract the symbol section base address. */ 2435 reloc_entry->addend -= symbol->section->output_section->vma; 2436 return bfd_reloc_continue; 2437 } 2438 2439 static bfd_reloc_status_type 2440 ppc64_elf_sectoff_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2441 void *data, asection *input_section, 2442 bfd *output_bfd, char **error_message) 2443 { 2444 /* If this is a relocatable link (output_bfd test tells us), just 2445 call the generic function. Any adjustment will be done at final 2446 link time. */ 2447 if (output_bfd != NULL) 2448 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2449 input_section, output_bfd, error_message); 2450 2451 /* Subtract the symbol section base address. */ 2452 reloc_entry->addend -= symbol->section->output_section->vma; 2453 2454 /* Adjust the addend for sign extension of the low 16 bits. */ 2455 reloc_entry->addend += 0x8000; 2456 return bfd_reloc_continue; 2457 } 2458 2459 static bfd_reloc_status_type 2460 ppc64_elf_toc_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2461 void *data, asection *input_section, 2462 bfd *output_bfd, char **error_message) 2463 { 2464 bfd_vma TOCstart; 2465 2466 /* If this is a relocatable link (output_bfd test tells us), just 2467 call the generic function. Any adjustment will be done at final 2468 link time. */ 2469 if (output_bfd != NULL) 2470 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2471 input_section, output_bfd, error_message); 2472 2473 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2474 if (TOCstart == 0) 2475 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2476 2477 /* Subtract the TOC base address. */ 2478 reloc_entry->addend -= TOCstart + TOC_BASE_OFF; 2479 return bfd_reloc_continue; 2480 } 2481 2482 static bfd_reloc_status_type 2483 ppc64_elf_toc_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2484 void *data, asection *input_section, 2485 bfd *output_bfd, char **error_message) 2486 { 2487 bfd_vma TOCstart; 2488 2489 /* If this is a relocatable link (output_bfd test tells us), just 2490 call the generic function. Any adjustment will be done at final 2491 link time. */ 2492 if (output_bfd != NULL) 2493 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2494 input_section, output_bfd, error_message); 2495 2496 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2497 if (TOCstart == 0) 2498 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2499 2500 /* Subtract the TOC base address. */ 2501 reloc_entry->addend -= TOCstart + TOC_BASE_OFF; 2502 2503 /* Adjust the addend for sign extension of the low 16 bits. */ 2504 reloc_entry->addend += 0x8000; 2505 return bfd_reloc_continue; 2506 } 2507 2508 static bfd_reloc_status_type 2509 ppc64_elf_toc64_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2510 void *data, asection *input_section, 2511 bfd *output_bfd, char **error_message) 2512 { 2513 bfd_vma TOCstart; 2514 bfd_size_type octets; 2515 2516 /* If this is a relocatable link (output_bfd test tells us), just 2517 call the generic function. Any adjustment will be done at final 2518 link time. */ 2519 if (output_bfd != NULL) 2520 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2521 input_section, output_bfd, error_message); 2522 2523 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2524 if (TOCstart == 0) 2525 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2526 2527 octets = reloc_entry->address * bfd_octets_per_byte (abfd); 2528 bfd_put_64 (abfd, TOCstart + TOC_BASE_OFF, (bfd_byte *) data + octets); 2529 return bfd_reloc_ok; 2530 } 2531 2532 static bfd_reloc_status_type 2533 ppc64_elf_unhandled_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2534 void *data, asection *input_section, 2535 bfd *output_bfd, char **error_message) 2536 { 2537 /* If this is a relocatable link (output_bfd test tells us), just 2538 call the generic function. Any adjustment will be done at final 2539 link time. */ 2540 if (output_bfd != NULL) 2541 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2542 input_section, output_bfd, error_message); 2543 2544 if (error_message != NULL) 2545 { 2546 static char buf[60]; 2547 sprintf (buf, "generic linker can't handle %s", 2548 reloc_entry->howto->name); 2549 *error_message = buf; 2550 } 2551 return bfd_reloc_dangerous; 2552 } 2553 2554 /* Track GOT entries needed for a given symbol. We might need more 2555 than one got entry per symbol. */ 2556 struct got_entry 2557 { 2558 struct got_entry *next; 2559 2560 /* The symbol addend that we'll be placing in the GOT. */ 2561 bfd_vma addend; 2562 2563 /* Unlike other ELF targets, we use separate GOT entries for the same 2564 symbol referenced from different input files. This is to support 2565 automatic multiple TOC/GOT sections, where the TOC base can vary 2566 from one input file to another. After partitioning into TOC groups 2567 we merge entries within the group. 2568 2569 Point to the BFD owning this GOT entry. */ 2570 bfd *owner; 2571 2572 /* Zero for non-tls entries, or TLS_TLS and one of TLS_GD, TLS_LD, 2573 TLS_TPREL or TLS_DTPREL for tls entries. */ 2574 unsigned char tls_type; 2575 2576 /* Non-zero if got.ent points to real entry. */ 2577 unsigned char is_indirect; 2578 2579 /* Reference count until size_dynamic_sections, GOT offset thereafter. */ 2580 union 2581 { 2582 bfd_signed_vma refcount; 2583 bfd_vma offset; 2584 struct got_entry *ent; 2585 } got; 2586 }; 2587 2588 /* The same for PLT. */ 2589 struct plt_entry 2590 { 2591 struct plt_entry *next; 2592 2593 bfd_vma addend; 2594 2595 union 2596 { 2597 bfd_signed_vma refcount; 2598 bfd_vma offset; 2599 } plt; 2600 }; 2601 2602 struct ppc64_elf_obj_tdata 2603 { 2604 struct elf_obj_tdata elf; 2605 2606 /* Shortcuts to dynamic linker sections. */ 2607 asection *got; 2608 asection *relgot; 2609 2610 /* Used during garbage collection. We attach global symbols defined 2611 on removed .opd entries to this section so that the sym is removed. */ 2612 asection *deleted_section; 2613 2614 /* TLS local dynamic got entry handling. Support for multiple GOT 2615 sections means we potentially need one of these for each input bfd. */ 2616 struct got_entry tlsld_got; 2617 2618 /* A copy of relocs before they are modified for --emit-relocs. */ 2619 Elf_Internal_Rela *opd_relocs; 2620 2621 /* Nonzero if this bfd has small toc/got relocs, ie. that expect 2622 the reloc to be in the range -32768 to 32767. */ 2623 unsigned int has_small_toc_reloc : 1; 2624 2625 /* Set if toc/got ha relocs detected not using r2, or lo reloc 2626 instruction not one we handle. */ 2627 unsigned int unexpected_toc_insn : 1; 2628 }; 2629 2630 #define ppc64_elf_tdata(bfd) \ 2631 ((struct ppc64_elf_obj_tdata *) (bfd)->tdata.any) 2632 2633 #define ppc64_tlsld_got(bfd) \ 2634 (&ppc64_elf_tdata (bfd)->tlsld_got) 2635 2636 #define is_ppc64_elf(bfd) \ 2637 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 2638 && elf_object_id (bfd) == PPC64_ELF_DATA) 2639 2640 /* Override the generic function because we store some extras. */ 2641 2642 static bfd_boolean 2643 ppc64_elf_mkobject (bfd *abfd) 2644 { 2645 return bfd_elf_allocate_object (abfd, sizeof (struct ppc64_elf_obj_tdata), 2646 PPC64_ELF_DATA); 2647 } 2648 2649 /* Fix bad default arch selected for a 64 bit input bfd when the 2650 default is 32 bit. */ 2651 2652 static bfd_boolean 2653 ppc64_elf_object_p (bfd *abfd) 2654 { 2655 if (abfd->arch_info->the_default && abfd->arch_info->bits_per_word == 32) 2656 { 2657 Elf_Internal_Ehdr *i_ehdr = elf_elfheader (abfd); 2658 2659 if (i_ehdr->e_ident[EI_CLASS] == ELFCLASS64) 2660 { 2661 /* Relies on arch after 32 bit default being 64 bit default. */ 2662 abfd->arch_info = abfd->arch_info->next; 2663 BFD_ASSERT (abfd->arch_info->bits_per_word == 64); 2664 } 2665 } 2666 return TRUE; 2667 } 2668 2669 /* Support for core dump NOTE sections. */ 2670 2671 static bfd_boolean 2672 ppc64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 2673 { 2674 size_t offset, size; 2675 2676 if (note->descsz != 504) 2677 return FALSE; 2678 2679 /* pr_cursig */ 2680 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 2681 2682 /* pr_pid */ 2683 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 32); 2684 2685 /* pr_reg */ 2686 offset = 112; 2687 size = 384; 2688 2689 /* Make a ".reg/999" section. */ 2690 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 2691 size, note->descpos + offset); 2692 } 2693 2694 static bfd_boolean 2695 ppc64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 2696 { 2697 if (note->descsz != 136) 2698 return FALSE; 2699 2700 elf_tdata (abfd)->core_pid 2701 = bfd_get_32 (abfd, note->descdata + 24); 2702 elf_tdata (abfd)->core_program 2703 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); 2704 elf_tdata (abfd)->core_command 2705 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); 2706 2707 return TRUE; 2708 } 2709 2710 static char * 2711 ppc64_elf_write_core_note (bfd *abfd, char *buf, int *bufsiz, int note_type, 2712 ...) 2713 { 2714 switch (note_type) 2715 { 2716 default: 2717 return NULL; 2718 2719 case NT_PRPSINFO: 2720 { 2721 char data[136]; 2722 va_list ap; 2723 2724 va_start (ap, note_type); 2725 memset (data, 0, sizeof (data)); 2726 strncpy (data + 40, va_arg (ap, const char *), 16); 2727 strncpy (data + 56, va_arg (ap, const char *), 80); 2728 va_end (ap); 2729 return elfcore_write_note (abfd, buf, bufsiz, 2730 "CORE", note_type, data, sizeof (data)); 2731 } 2732 2733 case NT_PRSTATUS: 2734 { 2735 char data[504]; 2736 va_list ap; 2737 long pid; 2738 int cursig; 2739 const void *greg; 2740 2741 va_start (ap, note_type); 2742 memset (data, 0, 112); 2743 pid = va_arg (ap, long); 2744 bfd_put_32 (abfd, pid, data + 32); 2745 cursig = va_arg (ap, int); 2746 bfd_put_16 (abfd, cursig, data + 12); 2747 greg = va_arg (ap, const void *); 2748 memcpy (data + 112, greg, 384); 2749 memset (data + 496, 0, 8); 2750 va_end (ap); 2751 return elfcore_write_note (abfd, buf, bufsiz, 2752 "CORE", note_type, data, sizeof (data)); 2753 } 2754 } 2755 } 2756 2757 /* Add extra PPC sections. */ 2758 2759 static const struct bfd_elf_special_section ppc64_elf_special_sections[]= 2760 { 2761 { STRING_COMMA_LEN (".plt"), 0, SHT_NOBITS, 0 }, 2762 { STRING_COMMA_LEN (".sbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, 2763 { STRING_COMMA_LEN (".sdata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2764 { STRING_COMMA_LEN (".toc"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2765 { STRING_COMMA_LEN (".toc1"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2766 { STRING_COMMA_LEN (".tocbss"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, 2767 { NULL, 0, 0, 0, 0 } 2768 }; 2769 2770 enum _ppc64_sec_type { 2771 sec_normal = 0, 2772 sec_opd = 1, 2773 sec_toc = 2 2774 }; 2775 2776 struct _ppc64_elf_section_data 2777 { 2778 struct bfd_elf_section_data elf; 2779 2780 union 2781 { 2782 /* An array with one entry for each opd function descriptor. */ 2783 struct _opd_sec_data 2784 { 2785 /* Points to the function code section for local opd entries. */ 2786 asection **func_sec; 2787 2788 /* After editing .opd, adjust references to opd local syms. */ 2789 long *adjust; 2790 } opd; 2791 2792 /* An array for toc sections, indexed by offset/8. */ 2793 struct _toc_sec_data 2794 { 2795 /* Specifies the relocation symbol index used at a given toc offset. */ 2796 unsigned *symndx; 2797 2798 /* And the relocation addend. */ 2799 bfd_vma *add; 2800 } toc; 2801 } u; 2802 2803 enum _ppc64_sec_type sec_type:2; 2804 2805 /* Flag set when small branches are detected. Used to 2806 select suitable defaults for the stub group size. */ 2807 unsigned int has_14bit_branch:1; 2808 }; 2809 2810 #define ppc64_elf_section_data(sec) \ 2811 ((struct _ppc64_elf_section_data *) elf_section_data (sec)) 2812 2813 static bfd_boolean 2814 ppc64_elf_new_section_hook (bfd *abfd, asection *sec) 2815 { 2816 if (!sec->used_by_bfd) 2817 { 2818 struct _ppc64_elf_section_data *sdata; 2819 bfd_size_type amt = sizeof (*sdata); 2820 2821 sdata = bfd_zalloc (abfd, amt); 2822 if (sdata == NULL) 2823 return FALSE; 2824 sec->used_by_bfd = sdata; 2825 } 2826 2827 return _bfd_elf_new_section_hook (abfd, sec); 2828 } 2829 2830 static struct _opd_sec_data * 2831 get_opd_info (asection * sec) 2832 { 2833 if (sec != NULL 2834 && ppc64_elf_section_data (sec) != NULL 2835 && ppc64_elf_section_data (sec)->sec_type == sec_opd) 2836 return &ppc64_elf_section_data (sec)->u.opd; 2837 return NULL; 2838 } 2839 2840 /* Parameters for the qsort hook. */ 2841 static bfd_boolean synthetic_relocatable; 2842 2843 /* qsort comparison function for ppc64_elf_get_synthetic_symtab. */ 2844 2845 static int 2846 compare_symbols (const void *ap, const void *bp) 2847 { 2848 const asymbol *a = * (const asymbol **) ap; 2849 const asymbol *b = * (const asymbol **) bp; 2850 2851 /* Section symbols first. */ 2852 if ((a->flags & BSF_SECTION_SYM) && !(b->flags & BSF_SECTION_SYM)) 2853 return -1; 2854 if (!(a->flags & BSF_SECTION_SYM) && (b->flags & BSF_SECTION_SYM)) 2855 return 1; 2856 2857 /* then .opd symbols. */ 2858 if (strcmp (a->section->name, ".opd") == 0 2859 && strcmp (b->section->name, ".opd") != 0) 2860 return -1; 2861 if (strcmp (a->section->name, ".opd") != 0 2862 && strcmp (b->section->name, ".opd") == 0) 2863 return 1; 2864 2865 /* then other code symbols. */ 2866 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2867 == (SEC_CODE | SEC_ALLOC) 2868 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2869 != (SEC_CODE | SEC_ALLOC)) 2870 return -1; 2871 2872 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2873 != (SEC_CODE | SEC_ALLOC) 2874 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2875 == (SEC_CODE | SEC_ALLOC)) 2876 return 1; 2877 2878 if (synthetic_relocatable) 2879 { 2880 if (a->section->id < b->section->id) 2881 return -1; 2882 2883 if (a->section->id > b->section->id) 2884 return 1; 2885 } 2886 2887 if (a->value + a->section->vma < b->value + b->section->vma) 2888 return -1; 2889 2890 if (a->value + a->section->vma > b->value + b->section->vma) 2891 return 1; 2892 2893 /* For syms with the same value, prefer strong dynamic global function 2894 syms over other syms. */ 2895 if ((a->flags & BSF_GLOBAL) != 0 && (b->flags & BSF_GLOBAL) == 0) 2896 return -1; 2897 2898 if ((a->flags & BSF_GLOBAL) == 0 && (b->flags & BSF_GLOBAL) != 0) 2899 return 1; 2900 2901 if ((a->flags & BSF_FUNCTION) != 0 && (b->flags & BSF_FUNCTION) == 0) 2902 return -1; 2903 2904 if ((a->flags & BSF_FUNCTION) == 0 && (b->flags & BSF_FUNCTION) != 0) 2905 return 1; 2906 2907 if ((a->flags & BSF_WEAK) == 0 && (b->flags & BSF_WEAK) != 0) 2908 return -1; 2909 2910 if ((a->flags & BSF_WEAK) != 0 && (b->flags & BSF_WEAK) == 0) 2911 return 1; 2912 2913 if ((a->flags & BSF_DYNAMIC) != 0 && (b->flags & BSF_DYNAMIC) == 0) 2914 return -1; 2915 2916 if ((a->flags & BSF_DYNAMIC) == 0 && (b->flags & BSF_DYNAMIC) != 0) 2917 return 1; 2918 2919 return 0; 2920 } 2921 2922 /* Search SYMS for a symbol of the given VALUE. */ 2923 2924 static asymbol * 2925 sym_exists_at (asymbol **syms, long lo, long hi, int id, bfd_vma value) 2926 { 2927 long mid; 2928 2929 if (id == -1) 2930 { 2931 while (lo < hi) 2932 { 2933 mid = (lo + hi) >> 1; 2934 if (syms[mid]->value + syms[mid]->section->vma < value) 2935 lo = mid + 1; 2936 else if (syms[mid]->value + syms[mid]->section->vma > value) 2937 hi = mid; 2938 else 2939 return syms[mid]; 2940 } 2941 } 2942 else 2943 { 2944 while (lo < hi) 2945 { 2946 mid = (lo + hi) >> 1; 2947 if (syms[mid]->section->id < id) 2948 lo = mid + 1; 2949 else if (syms[mid]->section->id > id) 2950 hi = mid; 2951 else if (syms[mid]->value < value) 2952 lo = mid + 1; 2953 else if (syms[mid]->value > value) 2954 hi = mid; 2955 else 2956 return syms[mid]; 2957 } 2958 } 2959 return NULL; 2960 } 2961 2962 static bfd_boolean 2963 section_covers_vma (bfd *abfd ATTRIBUTE_UNUSED, asection *section, void *ptr) 2964 { 2965 bfd_vma vma = *(bfd_vma *) ptr; 2966 return ((section->flags & SEC_ALLOC) != 0 2967 && section->vma <= vma 2968 && vma < section->vma + section->size); 2969 } 2970 2971 /* Create synthetic symbols, effectively restoring "dot-symbol" function 2972 entry syms. Also generate @plt symbols for the glink branch table. */ 2973 2974 static long 2975 ppc64_elf_get_synthetic_symtab (bfd *abfd, 2976 long static_count, asymbol **static_syms, 2977 long dyn_count, asymbol **dyn_syms, 2978 asymbol **ret) 2979 { 2980 asymbol *s; 2981 long i; 2982 long count; 2983 char *names; 2984 long symcount, codesecsym, codesecsymend, secsymend, opdsymend; 2985 asection *opd; 2986 bfd_boolean relocatable = (abfd->flags & (EXEC_P | DYNAMIC)) == 0; 2987 asymbol **syms; 2988 2989 *ret = NULL; 2990 2991 opd = bfd_get_section_by_name (abfd, ".opd"); 2992 if (opd == NULL) 2993 return 0; 2994 2995 symcount = static_count; 2996 if (!relocatable) 2997 symcount += dyn_count; 2998 if (symcount == 0) 2999 return 0; 3000 3001 syms = bfd_malloc ((symcount + 1) * sizeof (*syms)); 3002 if (syms == NULL) 3003 return -1; 3004 3005 if (!relocatable && static_count != 0 && dyn_count != 0) 3006 { 3007 /* Use both symbol tables. */ 3008 memcpy (syms, static_syms, static_count * sizeof (*syms)); 3009 memcpy (syms + static_count, dyn_syms, (dyn_count + 1) * sizeof (*syms)); 3010 } 3011 else if (!relocatable && static_count == 0) 3012 memcpy (syms, dyn_syms, (symcount + 1) * sizeof (*syms)); 3013 else 3014 memcpy (syms, static_syms, (symcount + 1) * sizeof (*syms)); 3015 3016 synthetic_relocatable = relocatable; 3017 qsort (syms, symcount, sizeof (*syms), compare_symbols); 3018 3019 if (!relocatable && symcount > 1) 3020 { 3021 long j; 3022 /* Trim duplicate syms, since we may have merged the normal and 3023 dynamic symbols. Actually, we only care about syms that have 3024 different values, so trim any with the same value. */ 3025 for (i = 1, j = 1; i < symcount; ++i) 3026 if (syms[i - 1]->value + syms[i - 1]->section->vma 3027 != syms[i]->value + syms[i]->section->vma) 3028 syms[j++] = syms[i]; 3029 symcount = j; 3030 } 3031 3032 i = 0; 3033 if (strcmp (syms[i]->section->name, ".opd") == 0) 3034 ++i; 3035 codesecsym = i; 3036 3037 for (; i < symcount; ++i) 3038 if (((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 3039 != (SEC_CODE | SEC_ALLOC)) 3040 || (syms[i]->flags & BSF_SECTION_SYM) == 0) 3041 break; 3042 codesecsymend = i; 3043 3044 for (; i < symcount; ++i) 3045 if ((syms[i]->flags & BSF_SECTION_SYM) == 0) 3046 break; 3047 secsymend = i; 3048 3049 for (; i < symcount; ++i) 3050 if (strcmp (syms[i]->section->name, ".opd") != 0) 3051 break; 3052 opdsymend = i; 3053 3054 for (; i < symcount; ++i) 3055 if ((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 3056 != (SEC_CODE | SEC_ALLOC)) 3057 break; 3058 symcount = i; 3059 3060 count = 0; 3061 3062 if (relocatable) 3063 { 3064 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean); 3065 arelent *r; 3066 size_t size; 3067 long relcount; 3068 3069 if (opdsymend == secsymend) 3070 goto done; 3071 3072 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table; 3073 relcount = (opd->flags & SEC_RELOC) ? opd->reloc_count : 0; 3074 if (relcount == 0) 3075 goto done; 3076 3077 if (!(*slurp_relocs) (abfd, opd, static_syms, FALSE)) 3078 { 3079 count = -1; 3080 goto done; 3081 } 3082 3083 size = 0; 3084 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i) 3085 { 3086 asymbol *sym; 3087 3088 while (r < opd->relocation + relcount 3089 && r->address < syms[i]->value + opd->vma) 3090 ++r; 3091 3092 if (r == opd->relocation + relcount) 3093 break; 3094 3095 if (r->address != syms[i]->value + opd->vma) 3096 continue; 3097 3098 if (r->howto->type != R_PPC64_ADDR64) 3099 continue; 3100 3101 sym = *r->sym_ptr_ptr; 3102 if (!sym_exists_at (syms, opdsymend, symcount, 3103 sym->section->id, sym->value + r->addend)) 3104 { 3105 ++count; 3106 size += sizeof (asymbol); 3107 size += strlen (syms[i]->name) + 2; 3108 } 3109 } 3110 3111 s = *ret = bfd_malloc (size); 3112 if (s == NULL) 3113 { 3114 count = -1; 3115 goto done; 3116 } 3117 3118 names = (char *) (s + count); 3119 3120 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i) 3121 { 3122 asymbol *sym; 3123 3124 while (r < opd->relocation + relcount 3125 && r->address < syms[i]->value + opd->vma) 3126 ++r; 3127 3128 if (r == opd->relocation + relcount) 3129 break; 3130 3131 if (r->address != syms[i]->value + opd->vma) 3132 continue; 3133 3134 if (r->howto->type != R_PPC64_ADDR64) 3135 continue; 3136 3137 sym = *r->sym_ptr_ptr; 3138 if (!sym_exists_at (syms, opdsymend, symcount, 3139 sym->section->id, sym->value + r->addend)) 3140 { 3141 size_t len; 3142 3143 *s = *syms[i]; 3144 s->flags |= BSF_SYNTHETIC; 3145 s->section = sym->section; 3146 s->value = sym->value + r->addend; 3147 s->name = names; 3148 *names++ = '.'; 3149 len = strlen (syms[i]->name); 3150 memcpy (names, syms[i]->name, len + 1); 3151 names += len + 1; 3152 /* Have udata.p point back to the original symbol this 3153 synthetic symbol was derived from. */ 3154 s->udata.p = syms[i]; 3155 s++; 3156 } 3157 } 3158 } 3159 else 3160 { 3161 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean); 3162 bfd_byte *contents; 3163 size_t size; 3164 long plt_count = 0; 3165 bfd_vma glink_vma = 0, resolv_vma = 0; 3166 asection *dynamic, *glink = NULL, *relplt = NULL; 3167 arelent *p; 3168 3169 if (!bfd_malloc_and_get_section (abfd, opd, &contents)) 3170 { 3171 if (contents) 3172 { 3173 free_contents_and_exit: 3174 free (contents); 3175 } 3176 count = -1; 3177 goto done; 3178 } 3179 3180 size = 0; 3181 for (i = secsymend; i < opdsymend; ++i) 3182 { 3183 bfd_vma ent; 3184 3185 /* Ignore bogus symbols. */ 3186 if (syms[i]->value > opd->size - 8) 3187 continue; 3188 3189 ent = bfd_get_64 (abfd, contents + syms[i]->value); 3190 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)) 3191 { 3192 ++count; 3193 size += sizeof (asymbol); 3194 size += strlen (syms[i]->name) + 2; 3195 } 3196 } 3197 3198 /* Get start of .glink stubs from DT_PPC64_GLINK. */ 3199 if (dyn_count != 0 3200 && (dynamic = bfd_get_section_by_name (abfd, ".dynamic")) != NULL) 3201 { 3202 bfd_byte *dynbuf, *extdyn, *extdynend; 3203 size_t extdynsize; 3204 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *); 3205 3206 if (!bfd_malloc_and_get_section (abfd, dynamic, &dynbuf)) 3207 goto free_contents_and_exit; 3208 3209 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn; 3210 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in; 3211 3212 extdyn = dynbuf; 3213 extdynend = extdyn + dynamic->size; 3214 for (; extdyn < extdynend; extdyn += extdynsize) 3215 { 3216 Elf_Internal_Dyn dyn; 3217 (*swap_dyn_in) (abfd, extdyn, &dyn); 3218 3219 if (dyn.d_tag == DT_NULL) 3220 break; 3221 3222 if (dyn.d_tag == DT_PPC64_GLINK) 3223 { 3224 /* The first glink stub starts at offset 32; see comment in 3225 ppc64_elf_finish_dynamic_sections. */ 3226 glink_vma = dyn.d_un.d_val + 32; 3227 /* The .glink section usually does not survive the final 3228 link; search for the section (usually .text) where the 3229 glink stubs now reside. */ 3230 glink = bfd_sections_find_if (abfd, section_covers_vma, 3231 &glink_vma); 3232 break; 3233 } 3234 } 3235 3236 free (dynbuf); 3237 } 3238 3239 if (glink != NULL) 3240 { 3241 /* Determine __glink trampoline by reading the relative branch 3242 from the first glink stub. */ 3243 bfd_byte buf[4]; 3244 if (bfd_get_section_contents (abfd, glink, buf, 3245 glink_vma + 4 - glink->vma, 4)) 3246 { 3247 unsigned int insn = bfd_get_32 (abfd, buf); 3248 insn ^= B_DOT; 3249 if ((insn & ~0x3fffffc) == 0) 3250 resolv_vma = glink_vma + 4 + (insn ^ 0x2000000) - 0x2000000; 3251 } 3252 3253 if (resolv_vma) 3254 size += sizeof (asymbol) + sizeof ("__glink_PLTresolve"); 3255 3256 relplt = bfd_get_section_by_name (abfd, ".rela.plt"); 3257 if (relplt != NULL) 3258 { 3259 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table; 3260 if (! (*slurp_relocs) (abfd, relplt, dyn_syms, TRUE)) 3261 goto free_contents_and_exit; 3262 3263 plt_count = relplt->size / sizeof (Elf64_External_Rela); 3264 size += plt_count * sizeof (asymbol); 3265 3266 p = relplt->relocation; 3267 for (i = 0; i < plt_count; i++, p++) 3268 { 3269 size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt"); 3270 if (p->addend != 0) 3271 size += sizeof ("+0x") - 1 + 16; 3272 } 3273 } 3274 } 3275 3276 s = *ret = bfd_malloc (size); 3277 if (s == NULL) 3278 goto free_contents_and_exit; 3279 3280 names = (char *) (s + count + plt_count + (resolv_vma != 0)); 3281 3282 for (i = secsymend; i < opdsymend; ++i) 3283 { 3284 bfd_vma ent; 3285 3286 if (syms[i]->value > opd->size - 8) 3287 continue; 3288 3289 ent = bfd_get_64 (abfd, contents + syms[i]->value); 3290 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)) 3291 { 3292 long lo, hi; 3293 size_t len; 3294 asection *sec = abfd->sections; 3295 3296 *s = *syms[i]; 3297 lo = codesecsym; 3298 hi = codesecsymend; 3299 while (lo < hi) 3300 { 3301 long mid = (lo + hi) >> 1; 3302 if (syms[mid]->section->vma < ent) 3303 lo = mid + 1; 3304 else if (syms[mid]->section->vma > ent) 3305 hi = mid; 3306 else 3307 { 3308 sec = syms[mid]->section; 3309 break; 3310 } 3311 } 3312 3313 if (lo >= hi && lo > codesecsym) 3314 sec = syms[lo - 1]->section; 3315 3316 for (; sec != NULL; sec = sec->next) 3317 { 3318 if (sec->vma > ent) 3319 break; 3320 /* SEC_LOAD may not be set if SEC is from a separate debug 3321 info file. */ 3322 if ((sec->flags & SEC_ALLOC) == 0) 3323 break; 3324 if ((sec->flags & SEC_CODE) != 0) 3325 s->section = sec; 3326 } 3327 s->flags |= BSF_SYNTHETIC; 3328 s->value = ent - s->section->vma; 3329 s->name = names; 3330 *names++ = '.'; 3331 len = strlen (syms[i]->name); 3332 memcpy (names, syms[i]->name, len + 1); 3333 names += len + 1; 3334 /* Have udata.p point back to the original symbol this 3335 synthetic symbol was derived from. */ 3336 s->udata.p = syms[i]; 3337 s++; 3338 } 3339 } 3340 free (contents); 3341 3342 if (glink != NULL && relplt != NULL) 3343 { 3344 if (resolv_vma) 3345 { 3346 /* Add a symbol for the main glink trampoline. */ 3347 memset (s, 0, sizeof *s); 3348 s->the_bfd = abfd; 3349 s->flags = BSF_GLOBAL | BSF_SYNTHETIC; 3350 s->section = glink; 3351 s->value = resolv_vma - glink->vma; 3352 s->name = names; 3353 memcpy (names, "__glink_PLTresolve", sizeof ("__glink_PLTresolve")); 3354 names += sizeof ("__glink_PLTresolve"); 3355 s++; 3356 count++; 3357 } 3358 3359 /* FIXME: It would be very much nicer to put sym@plt on the 3360 stub rather than on the glink branch table entry. The 3361 objdump disassembler would then use a sensible symbol 3362 name on plt calls. The difficulty in doing so is 3363 a) finding the stubs, and, 3364 b) matching stubs against plt entries, and, 3365 c) there can be multiple stubs for a given plt entry. 3366 3367 Solving (a) could be done by code scanning, but older 3368 ppc64 binaries used different stubs to current code. 3369 (b) is the tricky one since you need to known the toc 3370 pointer for at least one function that uses a pic stub to 3371 be able to calculate the plt address referenced. 3372 (c) means gdb would need to set multiple breakpoints (or 3373 find the glink branch itself) when setting breakpoints 3374 for pending shared library loads. */ 3375 p = relplt->relocation; 3376 for (i = 0; i < plt_count; i++, p++) 3377 { 3378 size_t len; 3379 3380 *s = **p->sym_ptr_ptr; 3381 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since 3382 we are defining a symbol, ensure one of them is set. */ 3383 if ((s->flags & BSF_LOCAL) == 0) 3384 s->flags |= BSF_GLOBAL; 3385 s->flags |= BSF_SYNTHETIC; 3386 s->section = glink; 3387 s->value = glink_vma - glink->vma; 3388 s->name = names; 3389 s->udata.p = NULL; 3390 len = strlen ((*p->sym_ptr_ptr)->name); 3391 memcpy (names, (*p->sym_ptr_ptr)->name, len); 3392 names += len; 3393 if (p->addend != 0) 3394 { 3395 memcpy (names, "+0x", sizeof ("+0x") - 1); 3396 names += sizeof ("+0x") - 1; 3397 bfd_sprintf_vma (abfd, names, p->addend); 3398 names += strlen (names); 3399 } 3400 memcpy (names, "@plt", sizeof ("@plt")); 3401 names += sizeof ("@plt"); 3402 s++; 3403 glink_vma += 8; 3404 if (i >= 0x8000) 3405 glink_vma += 4; 3406 } 3407 count += plt_count; 3408 } 3409 } 3410 3411 done: 3412 free (syms); 3413 return count; 3414 } 3415 3416 /* The following functions are specific to the ELF linker, while 3417 functions above are used generally. Those named ppc64_elf_* are 3418 called by the main ELF linker code. They appear in this file more 3419 or less in the order in which they are called. eg. 3420 ppc64_elf_check_relocs is called early in the link process, 3421 ppc64_elf_finish_dynamic_sections is one of the last functions 3422 called. 3423 3424 PowerPC64-ELF uses a similar scheme to PowerPC64-XCOFF in that 3425 functions have both a function code symbol and a function descriptor 3426 symbol. A call to foo in a relocatable object file looks like: 3427 3428 . .text 3429 . x: 3430 . bl .foo 3431 . nop 3432 3433 The function definition in another object file might be: 3434 3435 . .section .opd 3436 . foo: .quad .foo 3437 . .quad .TOC.@tocbase 3438 . .quad 0 3439 . 3440 . .text 3441 . .foo: blr 3442 3443 When the linker resolves the call during a static link, the branch 3444 unsurprisingly just goes to .foo and the .opd information is unused. 3445 If the function definition is in a shared library, things are a little 3446 different: The call goes via a plt call stub, the opd information gets 3447 copied to the plt, and the linker patches the nop. 3448 3449 . x: 3450 . bl .foo_stub 3451 . ld 2,40(1) 3452 . 3453 . 3454 . .foo_stub: 3455 . addis 12,2,Lfoo@toc@ha # in practice, the call stub 3456 . addi 12,12,Lfoo@toc@l # is slightly optimized, but 3457 . std 2,40(1) # this is the general idea 3458 . ld 11,0(12) 3459 . ld 2,8(12) 3460 . mtctr 11 3461 . ld 11,16(12) 3462 . bctr 3463 . 3464 . .section .plt 3465 . Lfoo: reloc (R_PPC64_JMP_SLOT, foo) 3466 3467 The "reloc ()" notation is supposed to indicate that the linker emits 3468 an R_PPC64_JMP_SLOT reloc against foo. The dynamic linker does the opd 3469 copying. 3470 3471 What are the difficulties here? Well, firstly, the relocations 3472 examined by the linker in check_relocs are against the function code 3473 sym .foo, while the dynamic relocation in the plt is emitted against 3474 the function descriptor symbol, foo. Somewhere along the line, we need 3475 to carefully copy dynamic link information from one symbol to the other. 3476 Secondly, the generic part of the elf linker will make .foo a dynamic 3477 symbol as is normal for most other backends. We need foo dynamic 3478 instead, at least for an application final link. However, when 3479 creating a shared library containing foo, we need to have both symbols 3480 dynamic so that references to .foo are satisfied during the early 3481 stages of linking. Otherwise the linker might decide to pull in a 3482 definition from some other object, eg. a static library. 3483 3484 Update: As of August 2004, we support a new convention. Function 3485 calls may use the function descriptor symbol, ie. "bl foo". This 3486 behaves exactly as "bl .foo". */ 3487 3488 /* Of those relocs that might be copied as dynamic relocs, this function 3489 selects those that must be copied when linking a shared library, 3490 even when the symbol is local. */ 3491 3492 static int 3493 must_be_dyn_reloc (struct bfd_link_info *info, 3494 enum elf_ppc64_reloc_type r_type) 3495 { 3496 switch (r_type) 3497 { 3498 default: 3499 return 1; 3500 3501 case R_PPC64_REL32: 3502 case R_PPC64_REL64: 3503 case R_PPC64_REL30: 3504 return 0; 3505 3506 case R_PPC64_TPREL16: 3507 case R_PPC64_TPREL16_LO: 3508 case R_PPC64_TPREL16_HI: 3509 case R_PPC64_TPREL16_HA: 3510 case R_PPC64_TPREL16_DS: 3511 case R_PPC64_TPREL16_LO_DS: 3512 case R_PPC64_TPREL16_HIGHER: 3513 case R_PPC64_TPREL16_HIGHERA: 3514 case R_PPC64_TPREL16_HIGHEST: 3515 case R_PPC64_TPREL16_HIGHESTA: 3516 case R_PPC64_TPREL64: 3517 return !info->executable; 3518 } 3519 } 3520 3521 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 3522 copying dynamic variables from a shared lib into an app's dynbss 3523 section, and instead use a dynamic relocation to point into the 3524 shared lib. With code that gcc generates, it's vital that this be 3525 enabled; In the PowerPC64 ABI, the address of a function is actually 3526 the address of a function descriptor, which resides in the .opd 3527 section. gcc uses the descriptor directly rather than going via the 3528 GOT as some other ABI's do, which means that initialized function 3529 pointers must reference the descriptor. Thus, a function pointer 3530 initialized to the address of a function in a shared library will 3531 either require a copy reloc, or a dynamic reloc. Using a copy reloc 3532 redefines the function descriptor symbol to point to the copy. This 3533 presents a problem as a plt entry for that function is also 3534 initialized from the function descriptor symbol and the copy reloc 3535 may not be initialized first. */ 3536 #define ELIMINATE_COPY_RELOCS 1 3537 3538 /* Section name for stubs is the associated section name plus this 3539 string. */ 3540 #define STUB_SUFFIX ".stub" 3541 3542 /* Linker stubs. 3543 ppc_stub_long_branch: 3544 Used when a 14 bit branch (or even a 24 bit branch) can't reach its 3545 destination, but a 24 bit branch in a stub section will reach. 3546 . b dest 3547 3548 ppc_stub_plt_branch: 3549 Similar to the above, but a 24 bit branch in the stub section won't 3550 reach its destination. 3551 . addis %r12,%r2,xxx@toc@ha 3552 . ld %r11,xxx@toc@l(%r12) 3553 . mtctr %r11 3554 . bctr 3555 3556 ppc_stub_plt_call: 3557 Used to call a function in a shared library. If it so happens that 3558 the plt entry referenced crosses a 64k boundary, then an extra 3559 "addi %r12,%r12,xxx@toc@l" will be inserted before the "mtctr". 3560 . addis %r12,%r2,xxx@toc@ha 3561 . std %r2,40(%r1) 3562 . ld %r11,xxx+0@toc@l(%r12) 3563 . mtctr %r11 3564 . ld %r2,xxx+8@toc@l(%r12) 3565 . ld %r11,xxx+16@toc@l(%r12) 3566 . bctr 3567 3568 ppc_stub_long_branch and ppc_stub_plt_branch may also have additional 3569 code to adjust the value and save r2 to support multiple toc sections. 3570 A ppc_stub_long_branch with an r2 offset looks like: 3571 . std %r2,40(%r1) 3572 . addis %r2,%r2,off@ha 3573 . addi %r2,%r2,off@l 3574 . b dest 3575 3576 A ppc_stub_plt_branch with an r2 offset looks like: 3577 . std %r2,40(%r1) 3578 . addis %r12,%r2,xxx@toc@ha 3579 . ld %r11,xxx@toc@l(%r12) 3580 . addis %r2,%r2,off@ha 3581 . addi %r2,%r2,off@l 3582 . mtctr %r11 3583 . bctr 3584 3585 In cases where the "addis" instruction would add zero, the "addis" is 3586 omitted and following instructions modified slightly in some cases. 3587 */ 3588 3589 enum ppc_stub_type { 3590 ppc_stub_none, 3591 ppc_stub_long_branch, 3592 ppc_stub_long_branch_r2off, 3593 ppc_stub_plt_branch, 3594 ppc_stub_plt_branch_r2off, 3595 ppc_stub_plt_call, 3596 ppc_stub_plt_call_r2save 3597 }; 3598 3599 struct ppc_stub_hash_entry { 3600 3601 /* Base hash table entry structure. */ 3602 struct bfd_hash_entry root; 3603 3604 enum ppc_stub_type stub_type; 3605 3606 /* The stub section. */ 3607 asection *stub_sec; 3608 3609 /* Offset within stub_sec of the beginning of this stub. */ 3610 bfd_vma stub_offset; 3611 3612 /* Given the symbol's value and its section we can determine its final 3613 value when building the stubs (so the stub knows where to jump. */ 3614 bfd_vma target_value; 3615 asection *target_section; 3616 3617 /* The symbol table entry, if any, that this was derived from. */ 3618 struct ppc_link_hash_entry *h; 3619 struct plt_entry *plt_ent; 3620 3621 /* Where this stub is being called from, or, in the case of combined 3622 stub sections, the first input section in the group. */ 3623 asection *id_sec; 3624 }; 3625 3626 struct ppc_branch_hash_entry { 3627 3628 /* Base hash table entry structure. */ 3629 struct bfd_hash_entry root; 3630 3631 /* Offset within branch lookup table. */ 3632 unsigned int offset; 3633 3634 /* Generation marker. */ 3635 unsigned int iter; 3636 }; 3637 3638 struct ppc_link_hash_entry 3639 { 3640 struct elf_link_hash_entry elf; 3641 3642 union { 3643 /* A pointer to the most recently used stub hash entry against this 3644 symbol. */ 3645 struct ppc_stub_hash_entry *stub_cache; 3646 3647 /* A pointer to the next symbol starting with a '.' */ 3648 struct ppc_link_hash_entry *next_dot_sym; 3649 } u; 3650 3651 /* Track dynamic relocs copied for this symbol. */ 3652 struct elf_dyn_relocs *dyn_relocs; 3653 3654 /* Link between function code and descriptor symbols. */ 3655 struct ppc_link_hash_entry *oh; 3656 3657 /* Flag function code and descriptor symbols. */ 3658 unsigned int is_func:1; 3659 unsigned int is_func_descriptor:1; 3660 unsigned int fake:1; 3661 3662 /* Whether global opd/toc sym has been adjusted or not. 3663 After ppc64_elf_edit_opd/ppc64_elf_edit_toc has run, this flag 3664 should be set for all globals defined in any opd/toc section. */ 3665 unsigned int adjust_done:1; 3666 3667 /* Set if we twiddled this symbol to weak at some stage. */ 3668 unsigned int was_undefined:1; 3669 3670 /* Contexts in which symbol is used in the GOT (or TOC). 3671 TLS_GD .. TLS_EXPLICIT bits are or'd into the mask as the 3672 corresponding relocs are encountered during check_relocs. 3673 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to 3674 indicate the corresponding GOT entry type is not needed. 3675 tls_optimize may also set TLS_TPRELGD when a GD reloc turns into 3676 a TPREL one. We use a separate flag rather than setting TPREL 3677 just for convenience in distinguishing the two cases. */ 3678 #define TLS_GD 1 /* GD reloc. */ 3679 #define TLS_LD 2 /* LD reloc. */ 3680 #define TLS_TPREL 4 /* TPREL reloc, => IE. */ 3681 #define TLS_DTPREL 8 /* DTPREL reloc, => LD. */ 3682 #define TLS_TLS 16 /* Any TLS reloc. */ 3683 #define TLS_EXPLICIT 32 /* Marks TOC section TLS relocs. */ 3684 #define TLS_TPRELGD 64 /* TPREL reloc resulting from GD->IE. */ 3685 #define PLT_IFUNC 128 /* STT_GNU_IFUNC. */ 3686 unsigned char tls_mask; 3687 }; 3688 3689 /* ppc64 ELF linker hash table. */ 3690 3691 struct ppc_link_hash_table 3692 { 3693 struct elf_link_hash_table elf; 3694 3695 /* The stub hash table. */ 3696 struct bfd_hash_table stub_hash_table; 3697 3698 /* Another hash table for plt_branch stubs. */ 3699 struct bfd_hash_table branch_hash_table; 3700 3701 /* Hash table for function prologue tocsave. */ 3702 htab_t tocsave_htab; 3703 3704 /* Linker stub bfd. */ 3705 bfd *stub_bfd; 3706 3707 /* Linker call-backs. */ 3708 asection * (*add_stub_section) (const char *, asection *); 3709 void (*layout_sections_again) (void); 3710 3711 /* Array to keep track of which stub sections have been created, and 3712 information on stub grouping. */ 3713 struct map_stub { 3714 /* This is the section to which stubs in the group will be attached. */ 3715 asection *link_sec; 3716 /* The stub section. */ 3717 asection *stub_sec; 3718 /* Along with elf_gp, specifies the TOC pointer used in this group. */ 3719 bfd_vma toc_off; 3720 } *stub_group; 3721 3722 /* Temp used when calculating TOC pointers. */ 3723 bfd_vma toc_curr; 3724 bfd *toc_bfd; 3725 asection *toc_first_sec; 3726 3727 /* Highest input section id. */ 3728 int top_id; 3729 3730 /* Highest output section index. */ 3731 int top_index; 3732 3733 /* Used when adding symbols. */ 3734 struct ppc_link_hash_entry *dot_syms; 3735 3736 /* List of input sections for each output section. */ 3737 asection **input_list; 3738 3739 /* Short-cuts to get to dynamic linker sections. */ 3740 asection *got; 3741 asection *plt; 3742 asection *relplt; 3743 asection *iplt; 3744 asection *reliplt; 3745 asection *dynbss; 3746 asection *relbss; 3747 asection *glink; 3748 asection *sfpr; 3749 asection *brlt; 3750 asection *relbrlt; 3751 asection *glink_eh_frame; 3752 3753 /* Shortcut to .__tls_get_addr and __tls_get_addr. */ 3754 struct ppc_link_hash_entry *tls_get_addr; 3755 struct ppc_link_hash_entry *tls_get_addr_fd; 3756 3757 /* The size of reliplt used by got entry relocs. */ 3758 bfd_size_type got_reli_size; 3759 3760 /* Statistics. */ 3761 unsigned long stub_count[ppc_stub_plt_call_r2save]; 3762 3763 /* Number of stubs against global syms. */ 3764 unsigned long stub_globals; 3765 3766 /* Alignment of PLT call stubs. */ 3767 unsigned int plt_stub_align:4; 3768 3769 /* Set if PLT call stubs should load r11. */ 3770 unsigned int plt_static_chain:1; 3771 3772 /* Set if PLT call stubs need a read-read barrier. */ 3773 unsigned int plt_thread_safe:1; 3774 3775 /* Set if we should emit symbols for stubs. */ 3776 unsigned int emit_stub_syms:1; 3777 3778 /* Set if __tls_get_addr optimization should not be done. */ 3779 unsigned int no_tls_get_addr_opt:1; 3780 3781 /* Support for multiple toc sections. */ 3782 unsigned int do_multi_toc:1; 3783 unsigned int multi_toc_needed:1; 3784 unsigned int second_toc_pass:1; 3785 unsigned int do_toc_opt:1; 3786 3787 /* Set on error. */ 3788 unsigned int stub_error:1; 3789 3790 /* Temp used by ppc64_elf_process_dot_syms. */ 3791 unsigned int twiddled_syms:1; 3792 3793 /* Incremented every time we size stubs. */ 3794 unsigned int stub_iteration; 3795 3796 /* Small local sym cache. */ 3797 struct sym_cache sym_cache; 3798 }; 3799 3800 /* Rename some of the generic section flags to better document how they 3801 are used here. */ 3802 3803 /* Nonzero if this section has TLS related relocations. */ 3804 #define has_tls_reloc sec_flg0 3805 3806 /* Nonzero if this section has a call to __tls_get_addr. */ 3807 #define has_tls_get_addr_call sec_flg1 3808 3809 /* Nonzero if this section has any toc or got relocs. */ 3810 #define has_toc_reloc sec_flg2 3811 3812 /* Nonzero if this section has a call to another section that uses 3813 the toc or got. */ 3814 #define makes_toc_func_call sec_flg3 3815 3816 /* Recursion protection when determining above flag. */ 3817 #define call_check_in_progress sec_flg4 3818 #define call_check_done sec_flg5 3819 3820 /* Get the ppc64 ELF linker hash table from a link_info structure. */ 3821 3822 #define ppc_hash_table(p) \ 3823 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 3824 == PPC64_ELF_DATA ? ((struct ppc_link_hash_table *) ((p)->hash)) : NULL) 3825 3826 #define ppc_stub_hash_lookup(table, string, create, copy) \ 3827 ((struct ppc_stub_hash_entry *) \ 3828 bfd_hash_lookup ((table), (string), (create), (copy))) 3829 3830 #define ppc_branch_hash_lookup(table, string, create, copy) \ 3831 ((struct ppc_branch_hash_entry *) \ 3832 bfd_hash_lookup ((table), (string), (create), (copy))) 3833 3834 /* Create an entry in the stub hash table. */ 3835 3836 static struct bfd_hash_entry * 3837 stub_hash_newfunc (struct bfd_hash_entry *entry, 3838 struct bfd_hash_table *table, 3839 const char *string) 3840 { 3841 /* Allocate the structure if it has not already been allocated by a 3842 subclass. */ 3843 if (entry == NULL) 3844 { 3845 entry = bfd_hash_allocate (table, sizeof (struct ppc_stub_hash_entry)); 3846 if (entry == NULL) 3847 return entry; 3848 } 3849 3850 /* Call the allocation method of the superclass. */ 3851 entry = bfd_hash_newfunc (entry, table, string); 3852 if (entry != NULL) 3853 { 3854 struct ppc_stub_hash_entry *eh; 3855 3856 /* Initialize the local fields. */ 3857 eh = (struct ppc_stub_hash_entry *) entry; 3858 eh->stub_type = ppc_stub_none; 3859 eh->stub_sec = NULL; 3860 eh->stub_offset = 0; 3861 eh->target_value = 0; 3862 eh->target_section = NULL; 3863 eh->h = NULL; 3864 eh->id_sec = NULL; 3865 } 3866 3867 return entry; 3868 } 3869 3870 /* Create an entry in the branch hash table. */ 3871 3872 static struct bfd_hash_entry * 3873 branch_hash_newfunc (struct bfd_hash_entry *entry, 3874 struct bfd_hash_table *table, 3875 const char *string) 3876 { 3877 /* Allocate the structure if it has not already been allocated by a 3878 subclass. */ 3879 if (entry == NULL) 3880 { 3881 entry = bfd_hash_allocate (table, sizeof (struct ppc_branch_hash_entry)); 3882 if (entry == NULL) 3883 return entry; 3884 } 3885 3886 /* Call the allocation method of the superclass. */ 3887 entry = bfd_hash_newfunc (entry, table, string); 3888 if (entry != NULL) 3889 { 3890 struct ppc_branch_hash_entry *eh; 3891 3892 /* Initialize the local fields. */ 3893 eh = (struct ppc_branch_hash_entry *) entry; 3894 eh->offset = 0; 3895 eh->iter = 0; 3896 } 3897 3898 return entry; 3899 } 3900 3901 /* Create an entry in a ppc64 ELF linker hash table. */ 3902 3903 static struct bfd_hash_entry * 3904 link_hash_newfunc (struct bfd_hash_entry *entry, 3905 struct bfd_hash_table *table, 3906 const char *string) 3907 { 3908 /* Allocate the structure if it has not already been allocated by a 3909 subclass. */ 3910 if (entry == NULL) 3911 { 3912 entry = bfd_hash_allocate (table, sizeof (struct ppc_link_hash_entry)); 3913 if (entry == NULL) 3914 return entry; 3915 } 3916 3917 /* Call the allocation method of the superclass. */ 3918 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 3919 if (entry != NULL) 3920 { 3921 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) entry; 3922 3923 memset (&eh->u.stub_cache, 0, 3924 (sizeof (struct ppc_link_hash_entry) 3925 - offsetof (struct ppc_link_hash_entry, u.stub_cache))); 3926 3927 /* When making function calls, old ABI code references function entry 3928 points (dot symbols), while new ABI code references the function 3929 descriptor symbol. We need to make any combination of reference and 3930 definition work together, without breaking archive linking. 3931 3932 For a defined function "foo" and an undefined call to "bar": 3933 An old object defines "foo" and ".foo", references ".bar" (possibly 3934 "bar" too). 3935 A new object defines "foo" and references "bar". 3936 3937 A new object thus has no problem with its undefined symbols being 3938 satisfied by definitions in an old object. On the other hand, the 3939 old object won't have ".bar" satisfied by a new object. 3940 3941 Keep a list of newly added dot-symbols. */ 3942 3943 if (string[0] == '.') 3944 { 3945 struct ppc_link_hash_table *htab; 3946 3947 htab = (struct ppc_link_hash_table *) table; 3948 eh->u.next_dot_sym = htab->dot_syms; 3949 htab->dot_syms = eh; 3950 } 3951 } 3952 3953 return entry; 3954 } 3955 3956 struct tocsave_entry { 3957 asection *sec; 3958 bfd_vma offset; 3959 }; 3960 3961 static hashval_t 3962 tocsave_htab_hash (const void *p) 3963 { 3964 const struct tocsave_entry *e = (const struct tocsave_entry *) p; 3965 return ((bfd_vma)(intptr_t) e->sec ^ e->offset) >> 3; 3966 } 3967 3968 static int 3969 tocsave_htab_eq (const void *p1, const void *p2) 3970 { 3971 const struct tocsave_entry *e1 = (const struct tocsave_entry *) p1; 3972 const struct tocsave_entry *e2 = (const struct tocsave_entry *) p2; 3973 return e1->sec == e2->sec && e1->offset == e2->offset; 3974 } 3975 3976 /* Create a ppc64 ELF linker hash table. */ 3977 3978 static struct bfd_link_hash_table * 3979 ppc64_elf_link_hash_table_create (bfd *abfd) 3980 { 3981 struct ppc_link_hash_table *htab; 3982 bfd_size_type amt = sizeof (struct ppc_link_hash_table); 3983 3984 htab = bfd_zmalloc (amt); 3985 if (htab == NULL) 3986 return NULL; 3987 3988 if (!_bfd_elf_link_hash_table_init (&htab->elf, abfd, link_hash_newfunc, 3989 sizeof (struct ppc_link_hash_entry), 3990 PPC64_ELF_DATA)) 3991 { 3992 free (htab); 3993 return NULL; 3994 } 3995 3996 /* Init the stub hash table too. */ 3997 if (!bfd_hash_table_init (&htab->stub_hash_table, stub_hash_newfunc, 3998 sizeof (struct ppc_stub_hash_entry))) 3999 return NULL; 4000 4001 /* And the branch hash table. */ 4002 if (!bfd_hash_table_init (&htab->branch_hash_table, branch_hash_newfunc, 4003 sizeof (struct ppc_branch_hash_entry))) 4004 return NULL; 4005 4006 htab->tocsave_htab = htab_try_create (1024, 4007 tocsave_htab_hash, 4008 tocsave_htab_eq, 4009 NULL); 4010 if (htab->tocsave_htab == NULL) 4011 return NULL; 4012 4013 /* Initializing two fields of the union is just cosmetic. We really 4014 only care about glist, but when compiled on a 32-bit host the 4015 bfd_vma fields are larger. Setting the bfd_vma to zero makes 4016 debugger inspection of these fields look nicer. */ 4017 htab->elf.init_got_refcount.refcount = 0; 4018 htab->elf.init_got_refcount.glist = NULL; 4019 htab->elf.init_plt_refcount.refcount = 0; 4020 htab->elf.init_plt_refcount.glist = NULL; 4021 htab->elf.init_got_offset.offset = 0; 4022 htab->elf.init_got_offset.glist = NULL; 4023 htab->elf.init_plt_offset.offset = 0; 4024 htab->elf.init_plt_offset.glist = NULL; 4025 4026 return &htab->elf.root; 4027 } 4028 4029 /* Free the derived linker hash table. */ 4030 4031 static void 4032 ppc64_elf_link_hash_table_free (struct bfd_link_hash_table *hash) 4033 { 4034 struct ppc_link_hash_table *htab = (struct ppc_link_hash_table *) hash; 4035 4036 bfd_hash_table_free (&htab->stub_hash_table); 4037 bfd_hash_table_free (&htab->branch_hash_table); 4038 if (htab->tocsave_htab) 4039 htab_delete (htab->tocsave_htab); 4040 _bfd_generic_link_hash_table_free (hash); 4041 } 4042 4043 /* Satisfy the ELF linker by filling in some fields in our fake bfd. */ 4044 4045 void 4046 ppc64_elf_init_stub_bfd (bfd *abfd, struct bfd_link_info *info) 4047 { 4048 struct ppc_link_hash_table *htab; 4049 4050 elf_elfheader (abfd)->e_ident[EI_CLASS] = ELFCLASS64; 4051 4052 /* Always hook our dynamic sections into the first bfd, which is the 4053 linker created stub bfd. This ensures that the GOT header is at 4054 the start of the output TOC section. */ 4055 htab = ppc_hash_table (info); 4056 if (htab == NULL) 4057 return; 4058 htab->stub_bfd = abfd; 4059 htab->elf.dynobj = abfd; 4060 } 4061 4062 /* Build a name for an entry in the stub hash table. */ 4063 4064 static char * 4065 ppc_stub_name (const asection *input_section, 4066 const asection *sym_sec, 4067 const struct ppc_link_hash_entry *h, 4068 const Elf_Internal_Rela *rel) 4069 { 4070 char *stub_name; 4071 bfd_size_type len; 4072 4073 /* rel->r_addend is actually 64 bit, but who uses more than +/- 2^31 4074 offsets from a sym as a branch target? In fact, we could 4075 probably assume the addend is always zero. */ 4076 BFD_ASSERT (((int) rel->r_addend & 0xffffffff) == rel->r_addend); 4077 4078 if (h) 4079 { 4080 len = 8 + 1 + strlen (h->elf.root.root.string) + 1 + 8 + 1; 4081 stub_name = bfd_malloc (len); 4082 if (stub_name == NULL) 4083 return stub_name; 4084 4085 sprintf (stub_name, "%08x.%s+%x", 4086 input_section->id & 0xffffffff, 4087 h->elf.root.root.string, 4088 (int) rel->r_addend & 0xffffffff); 4089 } 4090 else 4091 { 4092 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1; 4093 stub_name = bfd_malloc (len); 4094 if (stub_name == NULL) 4095 return stub_name; 4096 4097 sprintf (stub_name, "%08x.%x:%x+%x", 4098 input_section->id & 0xffffffff, 4099 sym_sec->id & 0xffffffff, 4100 (int) ELF64_R_SYM (rel->r_info) & 0xffffffff, 4101 (int) rel->r_addend & 0xffffffff); 4102 } 4103 if (stub_name[len - 2] == '+' && stub_name[len - 1] == '0') 4104 stub_name[len - 2] = 0; 4105 return stub_name; 4106 } 4107 4108 /* Look up an entry in the stub hash. Stub entries are cached because 4109 creating the stub name takes a bit of time. */ 4110 4111 static struct ppc_stub_hash_entry * 4112 ppc_get_stub_entry (const asection *input_section, 4113 const asection *sym_sec, 4114 struct ppc_link_hash_entry *h, 4115 const Elf_Internal_Rela *rel, 4116 struct ppc_link_hash_table *htab) 4117 { 4118 struct ppc_stub_hash_entry *stub_entry; 4119 const asection *id_sec; 4120 4121 /* If this input section is part of a group of sections sharing one 4122 stub section, then use the id of the first section in the group. 4123 Stub names need to include a section id, as there may well be 4124 more than one stub used to reach say, printf, and we need to 4125 distinguish between them. */ 4126 id_sec = htab->stub_group[input_section->id].link_sec; 4127 4128 if (h != NULL && h->u.stub_cache != NULL 4129 && h->u.stub_cache->h == h 4130 && h->u.stub_cache->id_sec == id_sec) 4131 { 4132 stub_entry = h->u.stub_cache; 4133 } 4134 else 4135 { 4136 char *stub_name; 4137 4138 stub_name = ppc_stub_name (id_sec, sym_sec, h, rel); 4139 if (stub_name == NULL) 4140 return NULL; 4141 4142 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, 4143 stub_name, FALSE, FALSE); 4144 if (h != NULL) 4145 h->u.stub_cache = stub_entry; 4146 4147 free (stub_name); 4148 } 4149 4150 return stub_entry; 4151 } 4152 4153 /* Add a new stub entry to the stub hash. Not all fields of the new 4154 stub entry are initialised. */ 4155 4156 static struct ppc_stub_hash_entry * 4157 ppc_add_stub (const char *stub_name, 4158 asection *section, 4159 struct bfd_link_info *info) 4160 { 4161 struct ppc_link_hash_table *htab = ppc_hash_table (info); 4162 asection *link_sec; 4163 asection *stub_sec; 4164 struct ppc_stub_hash_entry *stub_entry; 4165 4166 link_sec = htab->stub_group[section->id].link_sec; 4167 stub_sec = htab->stub_group[section->id].stub_sec; 4168 if (stub_sec == NULL) 4169 { 4170 stub_sec = htab->stub_group[link_sec->id].stub_sec; 4171 if (stub_sec == NULL) 4172 { 4173 size_t namelen; 4174 bfd_size_type len; 4175 char *s_name; 4176 4177 namelen = strlen (link_sec->name); 4178 len = namelen + sizeof (STUB_SUFFIX); 4179 s_name = bfd_alloc (htab->stub_bfd, len); 4180 if (s_name == NULL) 4181 return NULL; 4182 4183 memcpy (s_name, link_sec->name, namelen); 4184 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX)); 4185 stub_sec = (*htab->add_stub_section) (s_name, link_sec); 4186 if (stub_sec == NULL) 4187 return NULL; 4188 htab->stub_group[link_sec->id].stub_sec = stub_sec; 4189 } 4190 htab->stub_group[section->id].stub_sec = stub_sec; 4191 } 4192 4193 /* Enter this entry into the linker stub hash table. */ 4194 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, stub_name, 4195 TRUE, FALSE); 4196 if (stub_entry == NULL) 4197 { 4198 info->callbacks->einfo (_("%P: %B: cannot create stub entry %s\n"), 4199 section->owner, stub_name); 4200 return NULL; 4201 } 4202 4203 stub_entry->stub_sec = stub_sec; 4204 stub_entry->stub_offset = 0; 4205 stub_entry->id_sec = link_sec; 4206 return stub_entry; 4207 } 4208 4209 /* Create sections for linker generated code. */ 4210 4211 static bfd_boolean 4212 create_linkage_sections (bfd *dynobj, struct bfd_link_info *info) 4213 { 4214 struct ppc_link_hash_table *htab; 4215 flagword flags; 4216 4217 htab = ppc_hash_table (info); 4218 if (htab == NULL) 4219 return FALSE; 4220 4221 /* Create .sfpr for code to save and restore fp regs. */ 4222 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_READONLY 4223 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 4224 htab->sfpr = bfd_make_section_anyway_with_flags (dynobj, ".sfpr", 4225 flags); 4226 if (htab->sfpr == NULL 4227 || ! bfd_set_section_alignment (dynobj, htab->sfpr, 2)) 4228 return FALSE; 4229 4230 /* Create .glink for lazy dynamic linking support. */ 4231 htab->glink = bfd_make_section_anyway_with_flags (dynobj, ".glink", 4232 flags); 4233 if (htab->glink == NULL 4234 || ! bfd_set_section_alignment (dynobj, htab->glink, 3)) 4235 return FALSE; 4236 4237 if (!info->no_ld_generated_unwind_info) 4238 { 4239 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_HAS_CONTENTS 4240 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 4241 htab->glink_eh_frame = bfd_make_section_anyway_with_flags (dynobj, 4242 ".eh_frame", 4243 flags); 4244 if (htab->glink_eh_frame == NULL 4245 || !bfd_set_section_alignment (dynobj, htab->glink_eh_frame, 2)) 4246 return FALSE; 4247 } 4248 4249 flags = SEC_ALLOC | SEC_LINKER_CREATED; 4250 htab->iplt = bfd_make_section_anyway_with_flags (dynobj, ".iplt", flags); 4251 if (htab->iplt == NULL 4252 || ! bfd_set_section_alignment (dynobj, htab->iplt, 3)) 4253 return FALSE; 4254 4255 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 4256 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 4257 htab->reliplt = bfd_make_section_anyway_with_flags (dynobj, 4258 ".rela.iplt", 4259 flags); 4260 if (htab->reliplt == NULL 4261 || ! bfd_set_section_alignment (dynobj, htab->reliplt, 3)) 4262 return FALSE; 4263 4264 /* Create branch lookup table for plt_branch stubs. */ 4265 flags = (SEC_ALLOC | SEC_LOAD 4266 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 4267 htab->brlt = bfd_make_section_anyway_with_flags (dynobj, ".branch_lt", 4268 flags); 4269 if (htab->brlt == NULL 4270 || ! bfd_set_section_alignment (dynobj, htab->brlt, 3)) 4271 return FALSE; 4272 4273 if (!info->shared) 4274 return TRUE; 4275 4276 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 4277 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 4278 htab->relbrlt = bfd_make_section_anyway_with_flags (dynobj, 4279 ".rela.branch_lt", 4280 flags); 4281 if (htab->relbrlt == NULL 4282 || ! bfd_set_section_alignment (dynobj, htab->relbrlt, 3)) 4283 return FALSE; 4284 4285 return TRUE; 4286 } 4287 4288 /* Create .got and .rela.got sections in ABFD, and .got in dynobj if 4289 not already done. */ 4290 4291 static bfd_boolean 4292 create_got_section (bfd *abfd, struct bfd_link_info *info) 4293 { 4294 asection *got, *relgot; 4295 flagword flags; 4296 struct ppc_link_hash_table *htab = ppc_hash_table (info); 4297 4298 if (!is_ppc64_elf (abfd)) 4299 return FALSE; 4300 if (htab == NULL) 4301 return FALSE; 4302 4303 if (!htab->got) 4304 { 4305 if (! _bfd_elf_create_got_section (htab->elf.dynobj, info)) 4306 return FALSE; 4307 4308 htab->got = bfd_get_linker_section (htab->elf.dynobj, ".got"); 4309 if (!htab->got) 4310 abort (); 4311 } 4312 4313 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 4314 | SEC_LINKER_CREATED); 4315 4316 got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); 4317 if (!got 4318 || !bfd_set_section_alignment (abfd, got, 3)) 4319 return FALSE; 4320 4321 relgot = bfd_make_section_anyway_with_flags (abfd, ".rela.got", 4322 flags | SEC_READONLY); 4323 if (!relgot 4324 || ! bfd_set_section_alignment (abfd, relgot, 3)) 4325 return FALSE; 4326 4327 ppc64_elf_tdata (abfd)->got = got; 4328 ppc64_elf_tdata (abfd)->relgot = relgot; 4329 return TRUE; 4330 } 4331 4332 /* Create the dynamic sections, and set up shortcuts. */ 4333 4334 static bfd_boolean 4335 ppc64_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 4336 { 4337 struct ppc_link_hash_table *htab; 4338 4339 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 4340 return FALSE; 4341 4342 htab = ppc_hash_table (info); 4343 if (htab == NULL) 4344 return FALSE; 4345 4346 if (!htab->got) 4347 htab->got = bfd_get_linker_section (dynobj, ".got"); 4348 htab->plt = bfd_get_linker_section (dynobj, ".plt"); 4349 htab->relplt = bfd_get_linker_section (dynobj, ".rela.plt"); 4350 htab->dynbss = bfd_get_linker_section (dynobj, ".dynbss"); 4351 if (!info->shared) 4352 htab->relbss = bfd_get_linker_section (dynobj, ".rela.bss"); 4353 4354 if (!htab->got || !htab->plt || !htab->relplt || !htab->dynbss 4355 || (!info->shared && !htab->relbss)) 4356 abort (); 4357 4358 return TRUE; 4359 } 4360 4361 /* Follow indirect and warning symbol links. */ 4362 4363 static inline struct bfd_link_hash_entry * 4364 follow_link (struct bfd_link_hash_entry *h) 4365 { 4366 while (h->type == bfd_link_hash_indirect 4367 || h->type == bfd_link_hash_warning) 4368 h = h->u.i.link; 4369 return h; 4370 } 4371 4372 static inline struct elf_link_hash_entry * 4373 elf_follow_link (struct elf_link_hash_entry *h) 4374 { 4375 return (struct elf_link_hash_entry *) follow_link (&h->root); 4376 } 4377 4378 static inline struct ppc_link_hash_entry * 4379 ppc_follow_link (struct ppc_link_hash_entry *h) 4380 { 4381 return (struct ppc_link_hash_entry *) follow_link (&h->elf.root); 4382 } 4383 4384 /* Merge PLT info on FROM with that on TO. */ 4385 4386 static void 4387 move_plt_plist (struct ppc_link_hash_entry *from, 4388 struct ppc_link_hash_entry *to) 4389 { 4390 if (from->elf.plt.plist != NULL) 4391 { 4392 if (to->elf.plt.plist != NULL) 4393 { 4394 struct plt_entry **entp; 4395 struct plt_entry *ent; 4396 4397 for (entp = &from->elf.plt.plist; (ent = *entp) != NULL; ) 4398 { 4399 struct plt_entry *dent; 4400 4401 for (dent = to->elf.plt.plist; dent != NULL; dent = dent->next) 4402 if (dent->addend == ent->addend) 4403 { 4404 dent->plt.refcount += ent->plt.refcount; 4405 *entp = ent->next; 4406 break; 4407 } 4408 if (dent == NULL) 4409 entp = &ent->next; 4410 } 4411 *entp = to->elf.plt.plist; 4412 } 4413 4414 to->elf.plt.plist = from->elf.plt.plist; 4415 from->elf.plt.plist = NULL; 4416 } 4417 } 4418 4419 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 4420 4421 static void 4422 ppc64_elf_copy_indirect_symbol (struct bfd_link_info *info, 4423 struct elf_link_hash_entry *dir, 4424 struct elf_link_hash_entry *ind) 4425 { 4426 struct ppc_link_hash_entry *edir, *eind; 4427 4428 edir = (struct ppc_link_hash_entry *) dir; 4429 eind = (struct ppc_link_hash_entry *) ind; 4430 4431 edir->is_func |= eind->is_func; 4432 edir->is_func_descriptor |= eind->is_func_descriptor; 4433 edir->tls_mask |= eind->tls_mask; 4434 if (eind->oh != NULL) 4435 edir->oh = ppc_follow_link (eind->oh); 4436 4437 /* If called to transfer flags for a weakdef during processing 4438 of elf_adjust_dynamic_symbol, don't copy NON_GOT_REF. 4439 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 4440 if (!(ELIMINATE_COPY_RELOCS 4441 && eind->elf.root.type != bfd_link_hash_indirect 4442 && edir->elf.dynamic_adjusted)) 4443 edir->elf.non_got_ref |= eind->elf.non_got_ref; 4444 4445 edir->elf.ref_dynamic |= eind->elf.ref_dynamic; 4446 edir->elf.ref_regular |= eind->elf.ref_regular; 4447 edir->elf.ref_regular_nonweak |= eind->elf.ref_regular_nonweak; 4448 edir->elf.needs_plt |= eind->elf.needs_plt; 4449 4450 /* Copy over any dynamic relocs we may have on the indirect sym. */ 4451 if (eind->dyn_relocs != NULL) 4452 { 4453 if (edir->dyn_relocs != NULL) 4454 { 4455 struct elf_dyn_relocs **pp; 4456 struct elf_dyn_relocs *p; 4457 4458 /* Add reloc counts against the indirect sym to the direct sym 4459 list. Merge any entries against the same section. */ 4460 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 4461 { 4462 struct elf_dyn_relocs *q; 4463 4464 for (q = edir->dyn_relocs; q != NULL; q = q->next) 4465 if (q->sec == p->sec) 4466 { 4467 q->pc_count += p->pc_count; 4468 q->count += p->count; 4469 *pp = p->next; 4470 break; 4471 } 4472 if (q == NULL) 4473 pp = &p->next; 4474 } 4475 *pp = edir->dyn_relocs; 4476 } 4477 4478 edir->dyn_relocs = eind->dyn_relocs; 4479 eind->dyn_relocs = NULL; 4480 } 4481 4482 /* If we were called to copy over info for a weak sym, that's all. 4483 You might think dyn_relocs need not be copied over; After all, 4484 both syms will be dynamic or both non-dynamic so we're just 4485 moving reloc accounting around. However, ELIMINATE_COPY_RELOCS 4486 code in ppc64_elf_adjust_dynamic_symbol needs to check for 4487 dyn_relocs in read-only sections, and it does so on what is the 4488 DIR sym here. */ 4489 if (eind->elf.root.type != bfd_link_hash_indirect) 4490 return; 4491 4492 /* Copy over got entries that we may have already seen to the 4493 symbol which just became indirect. */ 4494 if (eind->elf.got.glist != NULL) 4495 { 4496 if (edir->elf.got.glist != NULL) 4497 { 4498 struct got_entry **entp; 4499 struct got_entry *ent; 4500 4501 for (entp = &eind->elf.got.glist; (ent = *entp) != NULL; ) 4502 { 4503 struct got_entry *dent; 4504 4505 for (dent = edir->elf.got.glist; dent != NULL; dent = dent->next) 4506 if (dent->addend == ent->addend 4507 && dent->owner == ent->owner 4508 && dent->tls_type == ent->tls_type) 4509 { 4510 dent->got.refcount += ent->got.refcount; 4511 *entp = ent->next; 4512 break; 4513 } 4514 if (dent == NULL) 4515 entp = &ent->next; 4516 } 4517 *entp = edir->elf.got.glist; 4518 } 4519 4520 edir->elf.got.glist = eind->elf.got.glist; 4521 eind->elf.got.glist = NULL; 4522 } 4523 4524 /* And plt entries. */ 4525 move_plt_plist (eind, edir); 4526 4527 if (eind->elf.dynindx != -1) 4528 { 4529 if (edir->elf.dynindx != -1) 4530 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 4531 edir->elf.dynstr_index); 4532 edir->elf.dynindx = eind->elf.dynindx; 4533 edir->elf.dynstr_index = eind->elf.dynstr_index; 4534 eind->elf.dynindx = -1; 4535 eind->elf.dynstr_index = 0; 4536 } 4537 } 4538 4539 /* Find the function descriptor hash entry from the given function code 4540 hash entry FH. Link the entries via their OH fields. */ 4541 4542 static struct ppc_link_hash_entry * 4543 lookup_fdh (struct ppc_link_hash_entry *fh, struct ppc_link_hash_table *htab) 4544 { 4545 struct ppc_link_hash_entry *fdh = fh->oh; 4546 4547 if (fdh == NULL) 4548 { 4549 const char *fd_name = fh->elf.root.root.string + 1; 4550 4551 fdh = (struct ppc_link_hash_entry *) 4552 elf_link_hash_lookup (&htab->elf, fd_name, FALSE, FALSE, FALSE); 4553 if (fdh == NULL) 4554 return fdh; 4555 4556 fdh->is_func_descriptor = 1; 4557 fdh->oh = fh; 4558 fh->is_func = 1; 4559 fh->oh = fdh; 4560 } 4561 4562 return ppc_follow_link (fdh); 4563 } 4564 4565 /* Make a fake function descriptor sym for the code sym FH. */ 4566 4567 static struct ppc_link_hash_entry * 4568 make_fdh (struct bfd_link_info *info, 4569 struct ppc_link_hash_entry *fh) 4570 { 4571 bfd *abfd; 4572 asymbol *newsym; 4573 struct bfd_link_hash_entry *bh; 4574 struct ppc_link_hash_entry *fdh; 4575 4576 abfd = fh->elf.root.u.undef.abfd; 4577 newsym = bfd_make_empty_symbol (abfd); 4578 newsym->name = fh->elf.root.root.string + 1; 4579 newsym->section = bfd_und_section_ptr; 4580 newsym->value = 0; 4581 newsym->flags = BSF_WEAK; 4582 4583 bh = NULL; 4584 if (!_bfd_generic_link_add_one_symbol (info, abfd, newsym->name, 4585 newsym->flags, newsym->section, 4586 newsym->value, NULL, FALSE, FALSE, 4587 &bh)) 4588 return NULL; 4589 4590 fdh = (struct ppc_link_hash_entry *) bh; 4591 fdh->elf.non_elf = 0; 4592 fdh->fake = 1; 4593 fdh->is_func_descriptor = 1; 4594 fdh->oh = fh; 4595 fh->is_func = 1; 4596 fh->oh = fdh; 4597 return fdh; 4598 } 4599 4600 /* Fix function descriptor symbols defined in .opd sections to be 4601 function type. */ 4602 4603 static bfd_boolean 4604 ppc64_elf_add_symbol_hook (bfd *ibfd, 4605 struct bfd_link_info *info, 4606 Elf_Internal_Sym *isym, 4607 const char **name ATTRIBUTE_UNUSED, 4608 flagword *flags ATTRIBUTE_UNUSED, 4609 asection **sec, 4610 bfd_vma *value ATTRIBUTE_UNUSED) 4611 { 4612 if ((ibfd->flags & DYNAMIC) == 0 4613 && ELF_ST_BIND (isym->st_info) == STB_GNU_UNIQUE) 4614 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE; 4615 4616 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 4617 { 4618 if ((ibfd->flags & DYNAMIC) == 0) 4619 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE; 4620 } 4621 else if (ELF_ST_TYPE (isym->st_info) == STT_FUNC) 4622 ; 4623 else if (*sec != NULL 4624 && strcmp ((*sec)->name, ".opd") == 0) 4625 isym->st_info = ELF_ST_INFO (ELF_ST_BIND (isym->st_info), STT_FUNC); 4626 4627 return TRUE; 4628 } 4629 4630 /* This function makes an old ABI object reference to ".bar" cause the 4631 inclusion of a new ABI object archive that defines "bar". 4632 NAME is a symbol defined in an archive. Return a symbol in the hash 4633 table that might be satisfied by the archive symbols. */ 4634 4635 static struct elf_link_hash_entry * 4636 ppc64_elf_archive_symbol_lookup (bfd *abfd, 4637 struct bfd_link_info *info, 4638 const char *name) 4639 { 4640 struct elf_link_hash_entry *h; 4641 char *dot_name; 4642 size_t len; 4643 4644 h = _bfd_elf_archive_symbol_lookup (abfd, info, name); 4645 if (h != NULL 4646 /* Don't return this sym if it is a fake function descriptor 4647 created by add_symbol_adjust. */ 4648 && !(h->root.type == bfd_link_hash_undefweak 4649 && ((struct ppc_link_hash_entry *) h)->fake)) 4650 return h; 4651 4652 if (name[0] == '.') 4653 return h; 4654 4655 len = strlen (name); 4656 dot_name = bfd_alloc (abfd, len + 2); 4657 if (dot_name == NULL) 4658 return (struct elf_link_hash_entry *) 0 - 1; 4659 dot_name[0] = '.'; 4660 memcpy (dot_name + 1, name, len + 1); 4661 h = _bfd_elf_archive_symbol_lookup (abfd, info, dot_name); 4662 bfd_release (abfd, dot_name); 4663 return h; 4664 } 4665 4666 /* This function satisfies all old ABI object references to ".bar" if a 4667 new ABI object defines "bar". Well, at least, undefined dot symbols 4668 are made weak. This stops later archive searches from including an 4669 object if we already have a function descriptor definition. It also 4670 prevents the linker complaining about undefined symbols. 4671 We also check and correct mismatched symbol visibility here. The 4672 most restrictive visibility of the function descriptor and the 4673 function entry symbol is used. */ 4674 4675 static bfd_boolean 4676 add_symbol_adjust (struct ppc_link_hash_entry *eh, struct bfd_link_info *info) 4677 { 4678 struct ppc_link_hash_table *htab; 4679 struct ppc_link_hash_entry *fdh; 4680 4681 if (eh->elf.root.type == bfd_link_hash_indirect) 4682 return TRUE; 4683 4684 if (eh->elf.root.type == bfd_link_hash_warning) 4685 eh = (struct ppc_link_hash_entry *) eh->elf.root.u.i.link; 4686 4687 if (eh->elf.root.root.string[0] != '.') 4688 abort (); 4689 4690 htab = ppc_hash_table (info); 4691 if (htab == NULL) 4692 return FALSE; 4693 4694 fdh = lookup_fdh (eh, htab); 4695 if (fdh == NULL) 4696 { 4697 if (!info->relocatable 4698 && (eh->elf.root.type == bfd_link_hash_undefined 4699 || eh->elf.root.type == bfd_link_hash_undefweak) 4700 && eh->elf.ref_regular) 4701 { 4702 /* Make an undefweak function descriptor sym, which is enough to 4703 pull in an --as-needed shared lib, but won't cause link 4704 errors. Archives are handled elsewhere. */ 4705 fdh = make_fdh (info, eh); 4706 if (fdh == NULL) 4707 return FALSE; 4708 fdh->elf.ref_regular = 1; 4709 } 4710 } 4711 else 4712 { 4713 unsigned entry_vis = ELF_ST_VISIBILITY (eh->elf.other) - 1; 4714 unsigned descr_vis = ELF_ST_VISIBILITY (fdh->elf.other) - 1; 4715 if (entry_vis < descr_vis) 4716 fdh->elf.other += entry_vis - descr_vis; 4717 else if (entry_vis > descr_vis) 4718 eh->elf.other += descr_vis - entry_vis; 4719 4720 if ((fdh->elf.root.type == bfd_link_hash_defined 4721 || fdh->elf.root.type == bfd_link_hash_defweak) 4722 && eh->elf.root.type == bfd_link_hash_undefined) 4723 { 4724 eh->elf.root.type = bfd_link_hash_undefweak; 4725 eh->was_undefined = 1; 4726 htab->twiddled_syms = 1; 4727 } 4728 } 4729 4730 return TRUE; 4731 } 4732 4733 /* Process list of dot-symbols we made in link_hash_newfunc. */ 4734 4735 static bfd_boolean 4736 ppc64_elf_process_dot_syms (bfd *ibfd, struct bfd_link_info *info) 4737 { 4738 struct ppc_link_hash_table *htab; 4739 struct ppc_link_hash_entry **p, *eh; 4740 4741 if (!is_ppc64_elf (info->output_bfd)) 4742 return TRUE; 4743 htab = ppc_hash_table (info); 4744 if (htab == NULL) 4745 return FALSE; 4746 4747 if (is_ppc64_elf (ibfd)) 4748 { 4749 p = &htab->dot_syms; 4750 while ((eh = *p) != NULL) 4751 { 4752 *p = NULL; 4753 if (!add_symbol_adjust (eh, info)) 4754 return FALSE; 4755 p = &eh->u.next_dot_sym; 4756 } 4757 } 4758 4759 /* Clear the list for non-ppc64 input files. */ 4760 p = &htab->dot_syms; 4761 while ((eh = *p) != NULL) 4762 { 4763 *p = NULL; 4764 p = &eh->u.next_dot_sym; 4765 } 4766 4767 /* We need to fix the undefs list for any syms we have twiddled to 4768 undef_weak. */ 4769 if (htab->twiddled_syms) 4770 { 4771 bfd_link_repair_undef_list (&htab->elf.root); 4772 htab->twiddled_syms = 0; 4773 } 4774 return TRUE; 4775 } 4776 4777 /* Undo hash table changes when an --as-needed input file is determined 4778 not to be needed. */ 4779 4780 static bfd_boolean 4781 ppc64_elf_as_needed_cleanup (bfd *ibfd ATTRIBUTE_UNUSED, 4782 struct bfd_link_info *info) 4783 { 4784 struct ppc_link_hash_table *htab = ppc_hash_table (info); 4785 4786 if (htab == NULL) 4787 return FALSE; 4788 4789 htab->dot_syms = NULL; 4790 return TRUE; 4791 } 4792 4793 /* If --just-symbols against a final linked binary, then assume we need 4794 toc adjusting stubs when calling functions defined there. */ 4795 4796 static void 4797 ppc64_elf_link_just_syms (asection *sec, struct bfd_link_info *info) 4798 { 4799 if ((sec->flags & SEC_CODE) != 0 4800 && (sec->owner->flags & (EXEC_P | DYNAMIC)) != 0 4801 && is_ppc64_elf (sec->owner)) 4802 { 4803 asection *got = bfd_get_section_by_name (sec->owner, ".got"); 4804 if (got != NULL 4805 && got->size >= elf_backend_got_header_size 4806 && bfd_get_section_by_name (sec->owner, ".opd") != NULL) 4807 sec->has_toc_reloc = 1; 4808 } 4809 _bfd_elf_link_just_syms (sec, info); 4810 } 4811 4812 static struct plt_entry ** 4813 update_local_sym_info (bfd *abfd, Elf_Internal_Shdr *symtab_hdr, 4814 unsigned long r_symndx, bfd_vma r_addend, int tls_type) 4815 { 4816 struct got_entry **local_got_ents = elf_local_got_ents (abfd); 4817 struct plt_entry **local_plt; 4818 unsigned char *local_got_tls_masks; 4819 4820 if (local_got_ents == NULL) 4821 { 4822 bfd_size_type size = symtab_hdr->sh_info; 4823 4824 size *= (sizeof (*local_got_ents) 4825 + sizeof (*local_plt) 4826 + sizeof (*local_got_tls_masks)); 4827 local_got_ents = bfd_zalloc (abfd, size); 4828 if (local_got_ents == NULL) 4829 return NULL; 4830 elf_local_got_ents (abfd) = local_got_ents; 4831 } 4832 4833 if ((tls_type & (PLT_IFUNC | TLS_EXPLICIT)) == 0) 4834 { 4835 struct got_entry *ent; 4836 4837 for (ent = local_got_ents[r_symndx]; ent != NULL; ent = ent->next) 4838 if (ent->addend == r_addend 4839 && ent->owner == abfd 4840 && ent->tls_type == tls_type) 4841 break; 4842 if (ent == NULL) 4843 { 4844 bfd_size_type amt = sizeof (*ent); 4845 ent = bfd_alloc (abfd, amt); 4846 if (ent == NULL) 4847 return FALSE; 4848 ent->next = local_got_ents[r_symndx]; 4849 ent->addend = r_addend; 4850 ent->owner = abfd; 4851 ent->tls_type = tls_type; 4852 ent->is_indirect = FALSE; 4853 ent->got.refcount = 0; 4854 local_got_ents[r_symndx] = ent; 4855 } 4856 ent->got.refcount += 1; 4857 } 4858 4859 local_plt = (struct plt_entry **) (local_got_ents + symtab_hdr->sh_info); 4860 local_got_tls_masks = (unsigned char *) (local_plt + symtab_hdr->sh_info); 4861 local_got_tls_masks[r_symndx] |= tls_type; 4862 4863 return local_plt + r_symndx; 4864 } 4865 4866 static bfd_boolean 4867 update_plt_info (bfd *abfd, struct plt_entry **plist, bfd_vma addend) 4868 { 4869 struct plt_entry *ent; 4870 4871 for (ent = *plist; ent != NULL; ent = ent->next) 4872 if (ent->addend == addend) 4873 break; 4874 if (ent == NULL) 4875 { 4876 bfd_size_type amt = sizeof (*ent); 4877 ent = bfd_alloc (abfd, amt); 4878 if (ent == NULL) 4879 return FALSE; 4880 ent->next = *plist; 4881 ent->addend = addend; 4882 ent->plt.refcount = 0; 4883 *plist = ent; 4884 } 4885 ent->plt.refcount += 1; 4886 return TRUE; 4887 } 4888 4889 static bfd_boolean 4890 is_branch_reloc (enum elf_ppc64_reloc_type r_type) 4891 { 4892 return (r_type == R_PPC64_REL24 4893 || r_type == R_PPC64_REL14 4894 || r_type == R_PPC64_REL14_BRTAKEN 4895 || r_type == R_PPC64_REL14_BRNTAKEN 4896 || r_type == R_PPC64_ADDR24 4897 || r_type == R_PPC64_ADDR14 4898 || r_type == R_PPC64_ADDR14_BRTAKEN 4899 || r_type == R_PPC64_ADDR14_BRNTAKEN); 4900 } 4901 4902 /* Look through the relocs for a section during the first phase, and 4903 calculate needed space in the global offset table, procedure 4904 linkage table, and dynamic reloc sections. */ 4905 4906 static bfd_boolean 4907 ppc64_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, 4908 asection *sec, const Elf_Internal_Rela *relocs) 4909 { 4910 struct ppc_link_hash_table *htab; 4911 Elf_Internal_Shdr *symtab_hdr; 4912 struct elf_link_hash_entry **sym_hashes; 4913 const Elf_Internal_Rela *rel; 4914 const Elf_Internal_Rela *rel_end; 4915 asection *sreloc; 4916 asection **opd_sym_map; 4917 struct elf_link_hash_entry *tga, *dottga; 4918 4919 if (info->relocatable) 4920 return TRUE; 4921 4922 /* Don't do anything special with non-loaded, non-alloced sections. 4923 In particular, any relocs in such sections should not affect GOT 4924 and PLT reference counting (ie. we don't allow them to create GOT 4925 or PLT entries), there's no possibility or desire to optimize TLS 4926 relocs, and there's not much point in propagating relocs to shared 4927 libs that the dynamic linker won't relocate. */ 4928 if ((sec->flags & SEC_ALLOC) == 0) 4929 return TRUE; 4930 4931 BFD_ASSERT (is_ppc64_elf (abfd)); 4932 4933 htab = ppc_hash_table (info); 4934 if (htab == NULL) 4935 return FALSE; 4936 4937 tga = elf_link_hash_lookup (&htab->elf, "__tls_get_addr", 4938 FALSE, FALSE, TRUE); 4939 dottga = elf_link_hash_lookup (&htab->elf, ".__tls_get_addr", 4940 FALSE, FALSE, TRUE); 4941 symtab_hdr = &elf_symtab_hdr (abfd); 4942 sym_hashes = elf_sym_hashes (abfd); 4943 sreloc = NULL; 4944 opd_sym_map = NULL; 4945 if (strcmp (sec->name, ".opd") == 0) 4946 { 4947 /* Garbage collection needs some extra help with .opd sections. 4948 We don't want to necessarily keep everything referenced by 4949 relocs in .opd, as that would keep all functions. Instead, 4950 if we reference an .opd symbol (a function descriptor), we 4951 want to keep the function code symbol's section. This is 4952 easy for global symbols, but for local syms we need to keep 4953 information about the associated function section. */ 4954 bfd_size_type amt; 4955 4956 amt = sec->size * sizeof (*opd_sym_map) / 8; 4957 opd_sym_map = bfd_zalloc (abfd, amt); 4958 if (opd_sym_map == NULL) 4959 return FALSE; 4960 ppc64_elf_section_data (sec)->u.opd.func_sec = opd_sym_map; 4961 BFD_ASSERT (ppc64_elf_section_data (sec)->sec_type == sec_normal); 4962 ppc64_elf_section_data (sec)->sec_type = sec_opd; 4963 } 4964 4965 if (htab->sfpr == NULL 4966 && !create_linkage_sections (htab->elf.dynobj, info)) 4967 return FALSE; 4968 4969 rel_end = relocs + sec->reloc_count; 4970 for (rel = relocs; rel < rel_end; rel++) 4971 { 4972 unsigned long r_symndx; 4973 struct elf_link_hash_entry *h; 4974 enum elf_ppc64_reloc_type r_type; 4975 int tls_type; 4976 struct _ppc64_elf_section_data *ppc64_sec; 4977 struct plt_entry **ifunc; 4978 4979 r_symndx = ELF64_R_SYM (rel->r_info); 4980 if (r_symndx < symtab_hdr->sh_info) 4981 h = NULL; 4982 else 4983 { 4984 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4985 h = elf_follow_link (h); 4986 } 4987 4988 tls_type = 0; 4989 ifunc = NULL; 4990 if (h != NULL) 4991 { 4992 if (h->type == STT_GNU_IFUNC) 4993 { 4994 h->needs_plt = 1; 4995 ifunc = &h->plt.plist; 4996 } 4997 } 4998 else 4999 { 5000 Elf_Internal_Sym *isym = bfd_sym_from_r_symndx (&htab->sym_cache, 5001 abfd, r_symndx); 5002 if (isym == NULL) 5003 return FALSE; 5004 5005 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 5006 { 5007 ifunc = update_local_sym_info (abfd, symtab_hdr, r_symndx, 5008 rel->r_addend, PLT_IFUNC); 5009 if (ifunc == NULL) 5010 return FALSE; 5011 } 5012 } 5013 r_type = ELF64_R_TYPE (rel->r_info); 5014 if (is_branch_reloc (r_type)) 5015 { 5016 if (h != NULL && (h == tga || h == dottga)) 5017 { 5018 if (rel != relocs 5019 && (ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_TLSGD 5020 || ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_TLSLD)) 5021 /* We have a new-style __tls_get_addr call with a marker 5022 reloc. */ 5023 ; 5024 else 5025 /* Mark this section as having an old-style call. */ 5026 sec->has_tls_get_addr_call = 1; 5027 } 5028 5029 /* STT_GNU_IFUNC symbols must have a PLT entry. */ 5030 if (ifunc != NULL 5031 && !update_plt_info (abfd, ifunc, rel->r_addend)) 5032 return FALSE; 5033 } 5034 5035 switch (r_type) 5036 { 5037 case R_PPC64_TLSGD: 5038 case R_PPC64_TLSLD: 5039 /* These special tls relocs tie a call to __tls_get_addr with 5040 its parameter symbol. */ 5041 break; 5042 5043 case R_PPC64_GOT_TLSLD16: 5044 case R_PPC64_GOT_TLSLD16_LO: 5045 case R_PPC64_GOT_TLSLD16_HI: 5046 case R_PPC64_GOT_TLSLD16_HA: 5047 tls_type = TLS_TLS | TLS_LD; 5048 goto dogottls; 5049 5050 case R_PPC64_GOT_TLSGD16: 5051 case R_PPC64_GOT_TLSGD16_LO: 5052 case R_PPC64_GOT_TLSGD16_HI: 5053 case R_PPC64_GOT_TLSGD16_HA: 5054 tls_type = TLS_TLS | TLS_GD; 5055 goto dogottls; 5056 5057 case R_PPC64_GOT_TPREL16_DS: 5058 case R_PPC64_GOT_TPREL16_LO_DS: 5059 case R_PPC64_GOT_TPREL16_HI: 5060 case R_PPC64_GOT_TPREL16_HA: 5061 if (!info->executable) 5062 info->flags |= DF_STATIC_TLS; 5063 tls_type = TLS_TLS | TLS_TPREL; 5064 goto dogottls; 5065 5066 case R_PPC64_GOT_DTPREL16_DS: 5067 case R_PPC64_GOT_DTPREL16_LO_DS: 5068 case R_PPC64_GOT_DTPREL16_HI: 5069 case R_PPC64_GOT_DTPREL16_HA: 5070 tls_type = TLS_TLS | TLS_DTPREL; 5071 dogottls: 5072 sec->has_tls_reloc = 1; 5073 /* Fall thru */ 5074 5075 case R_PPC64_GOT16: 5076 case R_PPC64_GOT16_DS: 5077 case R_PPC64_GOT16_HA: 5078 case R_PPC64_GOT16_HI: 5079 case R_PPC64_GOT16_LO: 5080 case R_PPC64_GOT16_LO_DS: 5081 /* This symbol requires a global offset table entry. */ 5082 sec->has_toc_reloc = 1; 5083 if (r_type == R_PPC64_GOT_TLSLD16 5084 || r_type == R_PPC64_GOT_TLSGD16 5085 || r_type == R_PPC64_GOT_TPREL16_DS 5086 || r_type == R_PPC64_GOT_DTPREL16_DS 5087 || r_type == R_PPC64_GOT16 5088 || r_type == R_PPC64_GOT16_DS) 5089 { 5090 htab->do_multi_toc = 1; 5091 ppc64_elf_tdata (abfd)->has_small_toc_reloc = 1; 5092 } 5093 5094 if (ppc64_elf_tdata (abfd)->got == NULL 5095 && !create_got_section (abfd, info)) 5096 return FALSE; 5097 5098 if (h != NULL) 5099 { 5100 struct ppc_link_hash_entry *eh; 5101 struct got_entry *ent; 5102 5103 eh = (struct ppc_link_hash_entry *) h; 5104 for (ent = eh->elf.got.glist; ent != NULL; ent = ent->next) 5105 if (ent->addend == rel->r_addend 5106 && ent->owner == abfd 5107 && ent->tls_type == tls_type) 5108 break; 5109 if (ent == NULL) 5110 { 5111 bfd_size_type amt = sizeof (*ent); 5112 ent = bfd_alloc (abfd, amt); 5113 if (ent == NULL) 5114 return FALSE; 5115 ent->next = eh->elf.got.glist; 5116 ent->addend = rel->r_addend; 5117 ent->owner = abfd; 5118 ent->tls_type = tls_type; 5119 ent->is_indirect = FALSE; 5120 ent->got.refcount = 0; 5121 eh->elf.got.glist = ent; 5122 } 5123 ent->got.refcount += 1; 5124 eh->tls_mask |= tls_type; 5125 } 5126 else 5127 /* This is a global offset table entry for a local symbol. */ 5128 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx, 5129 rel->r_addend, tls_type)) 5130 return FALSE; 5131 break; 5132 5133 case R_PPC64_PLT16_HA: 5134 case R_PPC64_PLT16_HI: 5135 case R_PPC64_PLT16_LO: 5136 case R_PPC64_PLT32: 5137 case R_PPC64_PLT64: 5138 /* This symbol requires a procedure linkage table entry. We 5139 actually build the entry in adjust_dynamic_symbol, 5140 because this might be a case of linking PIC code without 5141 linking in any dynamic objects, in which case we don't 5142 need to generate a procedure linkage table after all. */ 5143 if (h == NULL) 5144 { 5145 /* It does not make sense to have a procedure linkage 5146 table entry for a local symbol. */ 5147 bfd_set_error (bfd_error_bad_value); 5148 return FALSE; 5149 } 5150 else 5151 { 5152 if (!update_plt_info (abfd, &h->plt.plist, rel->r_addend)) 5153 return FALSE; 5154 h->needs_plt = 1; 5155 if (h->root.root.string[0] == '.' 5156 && h->root.root.string[1] != '\0') 5157 ((struct ppc_link_hash_entry *) h)->is_func = 1; 5158 } 5159 break; 5160 5161 /* The following relocations don't need to propagate the 5162 relocation if linking a shared object since they are 5163 section relative. */ 5164 case R_PPC64_SECTOFF: 5165 case R_PPC64_SECTOFF_LO: 5166 case R_PPC64_SECTOFF_HI: 5167 case R_PPC64_SECTOFF_HA: 5168 case R_PPC64_SECTOFF_DS: 5169 case R_PPC64_SECTOFF_LO_DS: 5170 case R_PPC64_DTPREL16: 5171 case R_PPC64_DTPREL16_LO: 5172 case R_PPC64_DTPREL16_HI: 5173 case R_PPC64_DTPREL16_HA: 5174 case R_PPC64_DTPREL16_DS: 5175 case R_PPC64_DTPREL16_LO_DS: 5176 case R_PPC64_DTPREL16_HIGHER: 5177 case R_PPC64_DTPREL16_HIGHERA: 5178 case R_PPC64_DTPREL16_HIGHEST: 5179 case R_PPC64_DTPREL16_HIGHESTA: 5180 break; 5181 5182 /* Nor do these. */ 5183 case R_PPC64_REL16: 5184 case R_PPC64_REL16_LO: 5185 case R_PPC64_REL16_HI: 5186 case R_PPC64_REL16_HA: 5187 break; 5188 5189 case R_PPC64_TOC16: 5190 case R_PPC64_TOC16_DS: 5191 htab->do_multi_toc = 1; 5192 ppc64_elf_tdata (abfd)->has_small_toc_reloc = 1; 5193 case R_PPC64_TOC16_LO: 5194 case R_PPC64_TOC16_HI: 5195 case R_PPC64_TOC16_HA: 5196 case R_PPC64_TOC16_LO_DS: 5197 sec->has_toc_reloc = 1; 5198 break; 5199 5200 /* This relocation describes the C++ object vtable hierarchy. 5201 Reconstruct it for later use during GC. */ 5202 case R_PPC64_GNU_VTINHERIT: 5203 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 5204 return FALSE; 5205 break; 5206 5207 /* This relocation describes which C++ vtable entries are actually 5208 used. Record for later use during GC. */ 5209 case R_PPC64_GNU_VTENTRY: 5210 BFD_ASSERT (h != NULL); 5211 if (h != NULL 5212 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 5213 return FALSE; 5214 break; 5215 5216 case R_PPC64_REL14: 5217 case R_PPC64_REL14_BRTAKEN: 5218 case R_PPC64_REL14_BRNTAKEN: 5219 { 5220 asection *dest = NULL; 5221 5222 /* Heuristic: If jumping outside our section, chances are 5223 we are going to need a stub. */ 5224 if (h != NULL) 5225 { 5226 /* If the sym is weak it may be overridden later, so 5227 don't assume we know where a weak sym lives. */ 5228 if (h->root.type == bfd_link_hash_defined) 5229 dest = h->root.u.def.section; 5230 } 5231 else 5232 { 5233 Elf_Internal_Sym *isym; 5234 5235 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 5236 abfd, r_symndx); 5237 if (isym == NULL) 5238 return FALSE; 5239 5240 dest = bfd_section_from_elf_index (abfd, isym->st_shndx); 5241 } 5242 5243 if (dest != sec) 5244 ppc64_elf_section_data (sec)->has_14bit_branch = 1; 5245 } 5246 /* Fall through. */ 5247 5248 case R_PPC64_REL24: 5249 if (h != NULL && ifunc == NULL) 5250 { 5251 /* We may need a .plt entry if the function this reloc 5252 refers to is in a shared lib. */ 5253 if (!update_plt_info (abfd, &h->plt.plist, rel->r_addend)) 5254 return FALSE; 5255 h->needs_plt = 1; 5256 if (h->root.root.string[0] == '.' 5257 && h->root.root.string[1] != '\0') 5258 ((struct ppc_link_hash_entry *) h)->is_func = 1; 5259 if (h == tga || h == dottga) 5260 sec->has_tls_reloc = 1; 5261 } 5262 break; 5263 5264 case R_PPC64_TPREL64: 5265 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_TPREL; 5266 if (!info->executable) 5267 info->flags |= DF_STATIC_TLS; 5268 goto dotlstoc; 5269 5270 case R_PPC64_DTPMOD64: 5271 if (rel + 1 < rel_end 5272 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64) 5273 && rel[1].r_offset == rel->r_offset + 8) 5274 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_GD; 5275 else 5276 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_LD; 5277 goto dotlstoc; 5278 5279 case R_PPC64_DTPREL64: 5280 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_DTPREL; 5281 if (rel != relocs 5282 && rel[-1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPMOD64) 5283 && rel[-1].r_offset == rel->r_offset - 8) 5284 /* This is the second reloc of a dtpmod, dtprel pair. 5285 Don't mark with TLS_DTPREL. */ 5286 goto dodyn; 5287 5288 dotlstoc: 5289 sec->has_tls_reloc = 1; 5290 if (h != NULL) 5291 { 5292 struct ppc_link_hash_entry *eh; 5293 eh = (struct ppc_link_hash_entry *) h; 5294 eh->tls_mask |= tls_type; 5295 } 5296 else 5297 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx, 5298 rel->r_addend, tls_type)) 5299 return FALSE; 5300 5301 ppc64_sec = ppc64_elf_section_data (sec); 5302 if (ppc64_sec->sec_type != sec_toc) 5303 { 5304 bfd_size_type amt; 5305 5306 /* One extra to simplify get_tls_mask. */ 5307 amt = sec->size * sizeof (unsigned) / 8 + sizeof (unsigned); 5308 ppc64_sec->u.toc.symndx = bfd_zalloc (abfd, amt); 5309 if (ppc64_sec->u.toc.symndx == NULL) 5310 return FALSE; 5311 amt = sec->size * sizeof (bfd_vma) / 8; 5312 ppc64_sec->u.toc.add = bfd_zalloc (abfd, amt); 5313 if (ppc64_sec->u.toc.add == NULL) 5314 return FALSE; 5315 BFD_ASSERT (ppc64_sec->sec_type == sec_normal); 5316 ppc64_sec->sec_type = sec_toc; 5317 } 5318 BFD_ASSERT (rel->r_offset % 8 == 0); 5319 ppc64_sec->u.toc.symndx[rel->r_offset / 8] = r_symndx; 5320 ppc64_sec->u.toc.add[rel->r_offset / 8] = rel->r_addend; 5321 5322 /* Mark the second slot of a GD or LD entry. 5323 -1 to indicate GD and -2 to indicate LD. */ 5324 if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_GD)) 5325 ppc64_sec->u.toc.symndx[rel->r_offset / 8 + 1] = -1; 5326 else if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_LD)) 5327 ppc64_sec->u.toc.symndx[rel->r_offset / 8 + 1] = -2; 5328 goto dodyn; 5329 5330 case R_PPC64_TPREL16: 5331 case R_PPC64_TPREL16_LO: 5332 case R_PPC64_TPREL16_HI: 5333 case R_PPC64_TPREL16_HA: 5334 case R_PPC64_TPREL16_DS: 5335 case R_PPC64_TPREL16_LO_DS: 5336 case R_PPC64_TPREL16_HIGHER: 5337 case R_PPC64_TPREL16_HIGHERA: 5338 case R_PPC64_TPREL16_HIGHEST: 5339 case R_PPC64_TPREL16_HIGHESTA: 5340 if (info->shared) 5341 { 5342 if (!info->executable) 5343 info->flags |= DF_STATIC_TLS; 5344 goto dodyn; 5345 } 5346 break; 5347 5348 case R_PPC64_ADDR64: 5349 if (opd_sym_map != NULL 5350 && rel + 1 < rel_end 5351 && ELF64_R_TYPE ((rel + 1)->r_info) == R_PPC64_TOC) 5352 { 5353 if (h != NULL) 5354 { 5355 if (h->root.root.string[0] == '.' 5356 && h->root.root.string[1] != 0 5357 && lookup_fdh ((struct ppc_link_hash_entry *) h, htab)) 5358 ; 5359 else 5360 ((struct ppc_link_hash_entry *) h)->is_func = 1; 5361 } 5362 else 5363 { 5364 asection *s; 5365 Elf_Internal_Sym *isym; 5366 5367 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 5368 abfd, r_symndx); 5369 if (isym == NULL) 5370 return FALSE; 5371 5372 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 5373 if (s != NULL && s != sec) 5374 opd_sym_map[rel->r_offset / 8] = s; 5375 } 5376 } 5377 /* Fall through. */ 5378 5379 case R_PPC64_REL30: 5380 case R_PPC64_REL32: 5381 case R_PPC64_REL64: 5382 case R_PPC64_ADDR14: 5383 case R_PPC64_ADDR14_BRNTAKEN: 5384 case R_PPC64_ADDR14_BRTAKEN: 5385 case R_PPC64_ADDR16: 5386 case R_PPC64_ADDR16_DS: 5387 case R_PPC64_ADDR16_HA: 5388 case R_PPC64_ADDR16_HI: 5389 case R_PPC64_ADDR16_HIGHER: 5390 case R_PPC64_ADDR16_HIGHERA: 5391 case R_PPC64_ADDR16_HIGHEST: 5392 case R_PPC64_ADDR16_HIGHESTA: 5393 case R_PPC64_ADDR16_LO: 5394 case R_PPC64_ADDR16_LO_DS: 5395 case R_PPC64_ADDR24: 5396 case R_PPC64_ADDR32: 5397 case R_PPC64_UADDR16: 5398 case R_PPC64_UADDR32: 5399 case R_PPC64_UADDR64: 5400 case R_PPC64_TOC: 5401 if (h != NULL && !info->shared) 5402 /* We may need a copy reloc. */ 5403 h->non_got_ref = 1; 5404 5405 /* Don't propagate .opd relocs. */ 5406 if (NO_OPD_RELOCS && opd_sym_map != NULL) 5407 break; 5408 5409 /* If we are creating a shared library, and this is a reloc 5410 against a global symbol, or a non PC relative reloc 5411 against a local symbol, then we need to copy the reloc 5412 into the shared library. However, if we are linking with 5413 -Bsymbolic, we do not need to copy a reloc against a 5414 global symbol which is defined in an object we are 5415 including in the link (i.e., DEF_REGULAR is set). At 5416 this point we have not seen all the input files, so it is 5417 possible that DEF_REGULAR is not set now but will be set 5418 later (it is never cleared). In case of a weak definition, 5419 DEF_REGULAR may be cleared later by a strong definition in 5420 a shared library. We account for that possibility below by 5421 storing information in the dyn_relocs field of the hash 5422 table entry. A similar situation occurs when creating 5423 shared libraries and symbol visibility changes render the 5424 symbol local. 5425 5426 If on the other hand, we are creating an executable, we 5427 may need to keep relocations for symbols satisfied by a 5428 dynamic library if we manage to avoid copy relocs for the 5429 symbol. */ 5430 dodyn: 5431 if ((info->shared 5432 && (must_be_dyn_reloc (info, r_type) 5433 || (h != NULL 5434 && (! info->symbolic 5435 || h->root.type == bfd_link_hash_defweak 5436 || !h->def_regular)))) 5437 || (ELIMINATE_COPY_RELOCS 5438 && !info->shared 5439 && h != NULL 5440 && (h->root.type == bfd_link_hash_defweak 5441 || !h->def_regular)) 5442 || (!info->shared 5443 && ifunc != NULL)) 5444 { 5445 struct elf_dyn_relocs *p; 5446 struct elf_dyn_relocs **head; 5447 5448 /* We must copy these reloc types into the output file. 5449 Create a reloc section in dynobj and make room for 5450 this reloc. */ 5451 if (sreloc == NULL) 5452 { 5453 sreloc = _bfd_elf_make_dynamic_reloc_section 5454 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE); 5455 5456 if (sreloc == NULL) 5457 return FALSE; 5458 } 5459 5460 /* If this is a global symbol, we count the number of 5461 relocations we need for this symbol. */ 5462 if (h != NULL) 5463 { 5464 head = &((struct ppc_link_hash_entry *) h)->dyn_relocs; 5465 } 5466 else 5467 { 5468 /* Track dynamic relocs needed for local syms too. 5469 We really need local syms available to do this 5470 easily. Oh well. */ 5471 asection *s; 5472 void *vpp; 5473 Elf_Internal_Sym *isym; 5474 5475 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 5476 abfd, r_symndx); 5477 if (isym == NULL) 5478 return FALSE; 5479 5480 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 5481 if (s == NULL) 5482 s = sec; 5483 5484 vpp = &elf_section_data (s)->local_dynrel; 5485 head = (struct elf_dyn_relocs **) vpp; 5486 } 5487 5488 p = *head; 5489 if (p == NULL || p->sec != sec) 5490 { 5491 p = bfd_alloc (htab->elf.dynobj, sizeof *p); 5492 if (p == NULL) 5493 return FALSE; 5494 p->next = *head; 5495 *head = p; 5496 p->sec = sec; 5497 p->count = 0; 5498 p->pc_count = 0; 5499 } 5500 5501 p->count += 1; 5502 if (!must_be_dyn_reloc (info, r_type)) 5503 p->pc_count += 1; 5504 } 5505 break; 5506 5507 default: 5508 break; 5509 } 5510 } 5511 5512 return TRUE; 5513 } 5514 5515 /* OFFSET in OPD_SEC specifies a function descriptor. Return the address 5516 of the code entry point, and its section. */ 5517 5518 static bfd_vma 5519 opd_entry_value (asection *opd_sec, 5520 bfd_vma offset, 5521 asection **code_sec, 5522 bfd_vma *code_off, 5523 bfd_boolean in_code_sec) 5524 { 5525 bfd *opd_bfd = opd_sec->owner; 5526 Elf_Internal_Rela *relocs; 5527 Elf_Internal_Rela *lo, *hi, *look; 5528 bfd_vma val; 5529 5530 /* No relocs implies we are linking a --just-symbols object, or looking 5531 at a final linked executable with addr2line or somesuch. */ 5532 if (opd_sec->reloc_count == 0) 5533 { 5534 char buf[8]; 5535 5536 if (!bfd_get_section_contents (opd_bfd, opd_sec, buf, offset, 8)) 5537 return (bfd_vma) -1; 5538 5539 val = bfd_get_64 (opd_bfd, buf); 5540 if (code_sec != NULL) 5541 { 5542 asection *sec, *likely = NULL; 5543 5544 if (in_code_sec) 5545 { 5546 sec = *code_sec; 5547 if (sec->vma <= val 5548 && val < sec->vma + sec->size) 5549 likely = sec; 5550 else 5551 val = -1; 5552 } 5553 else 5554 for (sec = opd_bfd->sections; sec != NULL; sec = sec->next) 5555 if (sec->vma <= val 5556 && (sec->flags & SEC_LOAD) != 0 5557 && (sec->flags & SEC_ALLOC) != 0) 5558 likely = sec; 5559 if (likely != NULL) 5560 { 5561 *code_sec = likely; 5562 if (code_off != NULL) 5563 *code_off = val - likely->vma; 5564 } 5565 } 5566 return val; 5567 } 5568 5569 BFD_ASSERT (is_ppc64_elf (opd_bfd)); 5570 5571 relocs = ppc64_elf_tdata (opd_bfd)->opd_relocs; 5572 if (relocs == NULL) 5573 relocs = _bfd_elf_link_read_relocs (opd_bfd, opd_sec, NULL, NULL, TRUE); 5574 5575 /* Go find the opd reloc at the sym address. */ 5576 lo = relocs; 5577 BFD_ASSERT (lo != NULL); 5578 hi = lo + opd_sec->reloc_count - 1; /* ignore last reloc */ 5579 val = (bfd_vma) -1; 5580 while (lo < hi) 5581 { 5582 look = lo + (hi - lo) / 2; 5583 if (look->r_offset < offset) 5584 lo = look + 1; 5585 else if (look->r_offset > offset) 5586 hi = look; 5587 else 5588 { 5589 Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (opd_bfd); 5590 5591 if (ELF64_R_TYPE (look->r_info) == R_PPC64_ADDR64 5592 && ELF64_R_TYPE ((look + 1)->r_info) == R_PPC64_TOC) 5593 { 5594 unsigned long symndx = ELF64_R_SYM (look->r_info); 5595 asection *sec; 5596 5597 if (symndx < symtab_hdr->sh_info 5598 || elf_sym_hashes (opd_bfd) == NULL) 5599 { 5600 Elf_Internal_Sym *sym; 5601 5602 sym = (Elf_Internal_Sym *) symtab_hdr->contents; 5603 if (sym == NULL) 5604 { 5605 size_t symcnt = symtab_hdr->sh_info; 5606 if (elf_sym_hashes (opd_bfd) == NULL) 5607 symcnt = symtab_hdr->sh_size / symtab_hdr->sh_entsize; 5608 sym = bfd_elf_get_elf_syms (opd_bfd, symtab_hdr, symcnt, 5609 0, NULL, NULL, NULL); 5610 if (sym == NULL) 5611 break; 5612 symtab_hdr->contents = (bfd_byte *) sym; 5613 } 5614 5615 sym += symndx; 5616 val = sym->st_value; 5617 sec = bfd_section_from_elf_index (opd_bfd, sym->st_shndx); 5618 BFD_ASSERT ((sec->flags & SEC_MERGE) == 0); 5619 } 5620 else 5621 { 5622 struct elf_link_hash_entry **sym_hashes; 5623 struct elf_link_hash_entry *rh; 5624 5625 sym_hashes = elf_sym_hashes (opd_bfd); 5626 rh = sym_hashes[symndx - symtab_hdr->sh_info]; 5627 rh = elf_follow_link (rh); 5628 BFD_ASSERT (rh->root.type == bfd_link_hash_defined 5629 || rh->root.type == bfd_link_hash_defweak); 5630 val = rh->root.u.def.value; 5631 sec = rh->root.u.def.section; 5632 } 5633 val += look->r_addend; 5634 if (code_off != NULL) 5635 *code_off = val; 5636 if (code_sec != NULL) 5637 { 5638 if (in_code_sec && *code_sec != sec) 5639 return -1; 5640 else 5641 *code_sec = sec; 5642 } 5643 if (sec != NULL && sec->output_section != NULL) 5644 val += sec->output_section->vma + sec->output_offset; 5645 } 5646 break; 5647 } 5648 } 5649 5650 return val; 5651 } 5652 5653 /* If the ELF symbol SYM might be a function in SEC, return the 5654 function size and set *CODE_OFF to the function's entry point, 5655 otherwise return zero. */ 5656 5657 static bfd_size_type 5658 ppc64_elf_maybe_function_sym (const asymbol *sym, asection *sec, 5659 bfd_vma *code_off) 5660 { 5661 bfd_size_type size; 5662 5663 if ((sym->flags & (BSF_SECTION_SYM | BSF_FILE | BSF_OBJECT 5664 | BSF_THREAD_LOCAL | BSF_RELC | BSF_SRELC)) != 0) 5665 return 0; 5666 5667 size = 0; 5668 if (!(sym->flags & BSF_SYNTHETIC)) 5669 size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size; 5670 5671 if (strcmp (sym->section->name, ".opd") == 0) 5672 { 5673 if (opd_entry_value (sym->section, sym->value, 5674 &sec, code_off, TRUE) == (bfd_vma) -1) 5675 return 0; 5676 /* An old ABI binary with dot-syms has a size of 24 on the .opd 5677 symbol. This size has nothing to do with the code size of the 5678 function, which is what we're supposed to return, but the 5679 code size isn't available without looking up the dot-sym. 5680 However, doing that would be a waste of time particularly 5681 since elf_find_function will look at the dot-sym anyway. 5682 Now, elf_find_function will keep the largest size of any 5683 function sym found at the code address of interest, so return 5684 1 here to avoid it incorrectly caching a larger function size 5685 for a small function. This does mean we return the wrong 5686 size for a new-ABI function of size 24, but all that does is 5687 disable caching for such functions. */ 5688 if (size == 24) 5689 size = 1; 5690 } 5691 else 5692 { 5693 if (sym->section != sec) 5694 return 0; 5695 *code_off = sym->value; 5696 } 5697 if (size == 0) 5698 size = 1; 5699 return size; 5700 } 5701 5702 /* Return true if symbol is defined in a regular object file. */ 5703 5704 static bfd_boolean 5705 is_static_defined (struct elf_link_hash_entry *h) 5706 { 5707 return ((h->root.type == bfd_link_hash_defined 5708 || h->root.type == bfd_link_hash_defweak) 5709 && h->root.u.def.section != NULL 5710 && h->root.u.def.section->output_section != NULL); 5711 } 5712 5713 /* If FDH is a function descriptor symbol, return the associated code 5714 entry symbol if it is defined. Return NULL otherwise. */ 5715 5716 static struct ppc_link_hash_entry * 5717 defined_code_entry (struct ppc_link_hash_entry *fdh) 5718 { 5719 if (fdh->is_func_descriptor) 5720 { 5721 struct ppc_link_hash_entry *fh = ppc_follow_link (fdh->oh); 5722 if (fh->elf.root.type == bfd_link_hash_defined 5723 || fh->elf.root.type == bfd_link_hash_defweak) 5724 return fh; 5725 } 5726 return NULL; 5727 } 5728 5729 /* If FH is a function code entry symbol, return the associated 5730 function descriptor symbol if it is defined. Return NULL otherwise. */ 5731 5732 static struct ppc_link_hash_entry * 5733 defined_func_desc (struct ppc_link_hash_entry *fh) 5734 { 5735 if (fh->oh != NULL 5736 && fh->oh->is_func_descriptor) 5737 { 5738 struct ppc_link_hash_entry *fdh = ppc_follow_link (fh->oh); 5739 if (fdh->elf.root.type == bfd_link_hash_defined 5740 || fdh->elf.root.type == bfd_link_hash_defweak) 5741 return fdh; 5742 } 5743 return NULL; 5744 } 5745 5746 /* Mark all our entry sym sections, both opd and code section. */ 5747 5748 static void 5749 ppc64_elf_gc_keep (struct bfd_link_info *info) 5750 { 5751 struct ppc_link_hash_table *htab = ppc_hash_table (info); 5752 struct bfd_sym_chain *sym; 5753 5754 if (htab == NULL) 5755 return; 5756 5757 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next) 5758 { 5759 struct ppc_link_hash_entry *eh, *fh; 5760 asection *sec; 5761 5762 eh = (struct ppc_link_hash_entry *) 5763 elf_link_hash_lookup (&htab->elf, sym->name, FALSE, FALSE, TRUE); 5764 if (eh == NULL) 5765 continue; 5766 if (eh->elf.root.type != bfd_link_hash_defined 5767 && eh->elf.root.type != bfd_link_hash_defweak) 5768 continue; 5769 5770 fh = defined_code_entry (eh); 5771 if (fh != NULL) 5772 { 5773 sec = fh->elf.root.u.def.section; 5774 sec->flags |= SEC_KEEP; 5775 } 5776 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5777 && opd_entry_value (eh->elf.root.u.def.section, 5778 eh->elf.root.u.def.value, 5779 &sec, NULL, FALSE) != (bfd_vma) -1) 5780 sec->flags |= SEC_KEEP; 5781 5782 sec = eh->elf.root.u.def.section; 5783 sec->flags |= SEC_KEEP; 5784 } 5785 } 5786 5787 /* Mark sections containing dynamically referenced symbols. When 5788 building shared libraries, we must assume that any visible symbol is 5789 referenced. */ 5790 5791 static bfd_boolean 5792 ppc64_elf_gc_mark_dynamic_ref (struct elf_link_hash_entry *h, void *inf) 5793 { 5794 struct bfd_link_info *info = (struct bfd_link_info *) inf; 5795 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h; 5796 struct ppc_link_hash_entry *fdh; 5797 5798 /* Dynamic linking info is on the func descriptor sym. */ 5799 fdh = defined_func_desc (eh); 5800 if (fdh != NULL) 5801 eh = fdh; 5802 5803 if ((eh->elf.root.type == bfd_link_hash_defined 5804 || eh->elf.root.type == bfd_link_hash_defweak) 5805 && (eh->elf.ref_dynamic 5806 || (!info->executable 5807 && eh->elf.def_regular 5808 && ELF_ST_VISIBILITY (eh->elf.other) != STV_INTERNAL 5809 && ELF_ST_VISIBILITY (eh->elf.other) != STV_HIDDEN 5810 && (strchr (eh->elf.root.root.string, ELF_VER_CHR) != NULL 5811 || !bfd_hide_sym_by_version (info->version_info, 5812 eh->elf.root.root.string))))) 5813 { 5814 asection *code_sec; 5815 struct ppc_link_hash_entry *fh; 5816 5817 eh->elf.root.u.def.section->flags |= SEC_KEEP; 5818 5819 /* Function descriptor syms cause the associated 5820 function code sym section to be marked. */ 5821 fh = defined_code_entry (eh); 5822 if (fh != NULL) 5823 { 5824 code_sec = fh->elf.root.u.def.section; 5825 code_sec->flags |= SEC_KEEP; 5826 } 5827 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5828 && opd_entry_value (eh->elf.root.u.def.section, 5829 eh->elf.root.u.def.value, 5830 &code_sec, NULL, FALSE) != (bfd_vma) -1) 5831 code_sec->flags |= SEC_KEEP; 5832 } 5833 5834 return TRUE; 5835 } 5836 5837 /* Return the section that should be marked against GC for a given 5838 relocation. */ 5839 5840 static asection * 5841 ppc64_elf_gc_mark_hook (asection *sec, 5842 struct bfd_link_info *info, 5843 Elf_Internal_Rela *rel, 5844 struct elf_link_hash_entry *h, 5845 Elf_Internal_Sym *sym) 5846 { 5847 asection *rsec; 5848 5849 /* Syms return NULL if we're marking .opd, so we avoid marking all 5850 function sections, as all functions are referenced in .opd. */ 5851 rsec = NULL; 5852 if (get_opd_info (sec) != NULL) 5853 return rsec; 5854 5855 if (h != NULL) 5856 { 5857 enum elf_ppc64_reloc_type r_type; 5858 struct ppc_link_hash_entry *eh, *fh, *fdh; 5859 5860 r_type = ELF64_R_TYPE (rel->r_info); 5861 switch (r_type) 5862 { 5863 case R_PPC64_GNU_VTINHERIT: 5864 case R_PPC64_GNU_VTENTRY: 5865 break; 5866 5867 default: 5868 switch (h->root.type) 5869 { 5870 case bfd_link_hash_defined: 5871 case bfd_link_hash_defweak: 5872 eh = (struct ppc_link_hash_entry *) h; 5873 fdh = defined_func_desc (eh); 5874 if (fdh != NULL) 5875 eh = fdh; 5876 5877 /* Function descriptor syms cause the associated 5878 function code sym section to be marked. */ 5879 fh = defined_code_entry (eh); 5880 if (fh != NULL) 5881 { 5882 /* They also mark their opd section. */ 5883 eh->elf.root.u.def.section->gc_mark = 1; 5884 5885 rsec = fh->elf.root.u.def.section; 5886 } 5887 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5888 && opd_entry_value (eh->elf.root.u.def.section, 5889 eh->elf.root.u.def.value, 5890 &rsec, NULL, FALSE) != (bfd_vma) -1) 5891 eh->elf.root.u.def.section->gc_mark = 1; 5892 else 5893 rsec = h->root.u.def.section; 5894 break; 5895 5896 case bfd_link_hash_common: 5897 rsec = h->root.u.c.p->section; 5898 break; 5899 5900 default: 5901 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 5902 } 5903 } 5904 } 5905 else 5906 { 5907 struct _opd_sec_data *opd; 5908 5909 rsec = bfd_section_from_elf_index (sec->owner, sym->st_shndx); 5910 opd = get_opd_info (rsec); 5911 if (opd != NULL && opd->func_sec != NULL) 5912 { 5913 rsec->gc_mark = 1; 5914 5915 rsec = opd->func_sec[(sym->st_value + rel->r_addend) / 8]; 5916 } 5917 } 5918 5919 return rsec; 5920 } 5921 5922 /* Update the .got, .plt. and dynamic reloc reference counts for the 5923 section being removed. */ 5924 5925 static bfd_boolean 5926 ppc64_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, 5927 asection *sec, const Elf_Internal_Rela *relocs) 5928 { 5929 struct ppc_link_hash_table *htab; 5930 Elf_Internal_Shdr *symtab_hdr; 5931 struct elf_link_hash_entry **sym_hashes; 5932 struct got_entry **local_got_ents; 5933 const Elf_Internal_Rela *rel, *relend; 5934 5935 if (info->relocatable) 5936 return TRUE; 5937 5938 if ((sec->flags & SEC_ALLOC) == 0) 5939 return TRUE; 5940 5941 elf_section_data (sec)->local_dynrel = NULL; 5942 5943 htab = ppc_hash_table (info); 5944 if (htab == NULL) 5945 return FALSE; 5946 5947 symtab_hdr = &elf_symtab_hdr (abfd); 5948 sym_hashes = elf_sym_hashes (abfd); 5949 local_got_ents = elf_local_got_ents (abfd); 5950 5951 relend = relocs + sec->reloc_count; 5952 for (rel = relocs; rel < relend; rel++) 5953 { 5954 unsigned long r_symndx; 5955 enum elf_ppc64_reloc_type r_type; 5956 struct elf_link_hash_entry *h = NULL; 5957 unsigned char tls_type = 0; 5958 5959 r_symndx = ELF64_R_SYM (rel->r_info); 5960 r_type = ELF64_R_TYPE (rel->r_info); 5961 if (r_symndx >= symtab_hdr->sh_info) 5962 { 5963 struct ppc_link_hash_entry *eh; 5964 struct elf_dyn_relocs **pp; 5965 struct elf_dyn_relocs *p; 5966 5967 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 5968 h = elf_follow_link (h); 5969 eh = (struct ppc_link_hash_entry *) h; 5970 5971 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 5972 if (p->sec == sec) 5973 { 5974 /* Everything must go for SEC. */ 5975 *pp = p->next; 5976 break; 5977 } 5978 } 5979 5980 if (is_branch_reloc (r_type)) 5981 { 5982 struct plt_entry **ifunc = NULL; 5983 if (h != NULL) 5984 { 5985 if (h->type == STT_GNU_IFUNC) 5986 ifunc = &h->plt.plist; 5987 } 5988 else if (local_got_ents != NULL) 5989 { 5990 struct plt_entry **local_plt = (struct plt_entry **) 5991 (local_got_ents + symtab_hdr->sh_info); 5992 unsigned char *local_got_tls_masks = (unsigned char *) 5993 (local_plt + symtab_hdr->sh_info); 5994 if ((local_got_tls_masks[r_symndx] & PLT_IFUNC) != 0) 5995 ifunc = local_plt + r_symndx; 5996 } 5997 if (ifunc != NULL) 5998 { 5999 struct plt_entry *ent; 6000 6001 for (ent = *ifunc; ent != NULL; ent = ent->next) 6002 if (ent->addend == rel->r_addend) 6003 break; 6004 if (ent == NULL) 6005 abort (); 6006 if (ent->plt.refcount > 0) 6007 ent->plt.refcount -= 1; 6008 continue; 6009 } 6010 } 6011 6012 switch (r_type) 6013 { 6014 case R_PPC64_GOT_TLSLD16: 6015 case R_PPC64_GOT_TLSLD16_LO: 6016 case R_PPC64_GOT_TLSLD16_HI: 6017 case R_PPC64_GOT_TLSLD16_HA: 6018 tls_type = TLS_TLS | TLS_LD; 6019 goto dogot; 6020 6021 case R_PPC64_GOT_TLSGD16: 6022 case R_PPC64_GOT_TLSGD16_LO: 6023 case R_PPC64_GOT_TLSGD16_HI: 6024 case R_PPC64_GOT_TLSGD16_HA: 6025 tls_type = TLS_TLS | TLS_GD; 6026 goto dogot; 6027 6028 case R_PPC64_GOT_TPREL16_DS: 6029 case R_PPC64_GOT_TPREL16_LO_DS: 6030 case R_PPC64_GOT_TPREL16_HI: 6031 case R_PPC64_GOT_TPREL16_HA: 6032 tls_type = TLS_TLS | TLS_TPREL; 6033 goto dogot; 6034 6035 case R_PPC64_GOT_DTPREL16_DS: 6036 case R_PPC64_GOT_DTPREL16_LO_DS: 6037 case R_PPC64_GOT_DTPREL16_HI: 6038 case R_PPC64_GOT_DTPREL16_HA: 6039 tls_type = TLS_TLS | TLS_DTPREL; 6040 goto dogot; 6041 6042 case R_PPC64_GOT16: 6043 case R_PPC64_GOT16_DS: 6044 case R_PPC64_GOT16_HA: 6045 case R_PPC64_GOT16_HI: 6046 case R_PPC64_GOT16_LO: 6047 case R_PPC64_GOT16_LO_DS: 6048 dogot: 6049 { 6050 struct got_entry *ent; 6051 6052 if (h != NULL) 6053 ent = h->got.glist; 6054 else 6055 ent = local_got_ents[r_symndx]; 6056 6057 for (; ent != NULL; ent = ent->next) 6058 if (ent->addend == rel->r_addend 6059 && ent->owner == abfd 6060 && ent->tls_type == tls_type) 6061 break; 6062 if (ent == NULL) 6063 abort (); 6064 if (ent->got.refcount > 0) 6065 ent->got.refcount -= 1; 6066 } 6067 break; 6068 6069 case R_PPC64_PLT16_HA: 6070 case R_PPC64_PLT16_HI: 6071 case R_PPC64_PLT16_LO: 6072 case R_PPC64_PLT32: 6073 case R_PPC64_PLT64: 6074 case R_PPC64_REL14: 6075 case R_PPC64_REL14_BRNTAKEN: 6076 case R_PPC64_REL14_BRTAKEN: 6077 case R_PPC64_REL24: 6078 if (h != NULL) 6079 { 6080 struct plt_entry *ent; 6081 6082 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 6083 if (ent->addend == rel->r_addend) 6084 break; 6085 if (ent != NULL && ent->plt.refcount > 0) 6086 ent->plt.refcount -= 1; 6087 } 6088 break; 6089 6090 default: 6091 break; 6092 } 6093 } 6094 return TRUE; 6095 } 6096 6097 /* The maximum size of .sfpr. */ 6098 #define SFPR_MAX (218*4) 6099 6100 struct sfpr_def_parms 6101 { 6102 const char name[12]; 6103 unsigned char lo, hi; 6104 bfd_byte * (*write_ent) (bfd *, bfd_byte *, int); 6105 bfd_byte * (*write_tail) (bfd *, bfd_byte *, int); 6106 }; 6107 6108 /* Auto-generate _save*, _rest* functions in .sfpr. */ 6109 6110 static bfd_boolean 6111 sfpr_define (struct bfd_link_info *info, const struct sfpr_def_parms *parm) 6112 { 6113 struct ppc_link_hash_table *htab = ppc_hash_table (info); 6114 unsigned int i; 6115 size_t len = strlen (parm->name); 6116 bfd_boolean writing = FALSE; 6117 char sym[16]; 6118 6119 if (htab == NULL) 6120 return FALSE; 6121 6122 memcpy (sym, parm->name, len); 6123 sym[len + 2] = 0; 6124 6125 for (i = parm->lo; i <= parm->hi; i++) 6126 { 6127 struct elf_link_hash_entry *h; 6128 6129 sym[len + 0] = i / 10 + '0'; 6130 sym[len + 1] = i % 10 + '0'; 6131 h = elf_link_hash_lookup (&htab->elf, sym, FALSE, FALSE, TRUE); 6132 if (h != NULL 6133 && !h->def_regular) 6134 { 6135 h->root.type = bfd_link_hash_defined; 6136 h->root.u.def.section = htab->sfpr; 6137 h->root.u.def.value = htab->sfpr->size; 6138 h->type = STT_FUNC; 6139 h->def_regular = 1; 6140 _bfd_elf_link_hash_hide_symbol (info, h, TRUE); 6141 writing = TRUE; 6142 if (htab->sfpr->contents == NULL) 6143 { 6144 htab->sfpr->contents = bfd_alloc (htab->elf.dynobj, SFPR_MAX); 6145 if (htab->sfpr->contents == NULL) 6146 return FALSE; 6147 } 6148 } 6149 if (writing) 6150 { 6151 bfd_byte *p = htab->sfpr->contents + htab->sfpr->size; 6152 if (i != parm->hi) 6153 p = (*parm->write_ent) (htab->elf.dynobj, p, i); 6154 else 6155 p = (*parm->write_tail) (htab->elf.dynobj, p, i); 6156 htab->sfpr->size = p - htab->sfpr->contents; 6157 } 6158 } 6159 6160 return TRUE; 6161 } 6162 6163 static bfd_byte * 6164 savegpr0 (bfd *abfd, bfd_byte *p, int r) 6165 { 6166 bfd_put_32 (abfd, STD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 6167 return p + 4; 6168 } 6169 6170 static bfd_byte * 6171 savegpr0_tail (bfd *abfd, bfd_byte *p, int r) 6172 { 6173 p = savegpr0 (abfd, p, r); 6174 bfd_put_32 (abfd, STD_R0_0R1 + 16, p); 6175 p = p + 4; 6176 bfd_put_32 (abfd, BLR, p); 6177 return p + 4; 6178 } 6179 6180 static bfd_byte * 6181 restgpr0 (bfd *abfd, bfd_byte *p, int r) 6182 { 6183 bfd_put_32 (abfd, LD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 6184 return p + 4; 6185 } 6186 6187 static bfd_byte * 6188 restgpr0_tail (bfd *abfd, bfd_byte *p, int r) 6189 { 6190 bfd_put_32 (abfd, LD_R0_0R1 + 16, p); 6191 p = p + 4; 6192 p = restgpr0 (abfd, p, r); 6193 bfd_put_32 (abfd, MTLR_R0, p); 6194 p = p + 4; 6195 if (r == 29) 6196 { 6197 p = restgpr0 (abfd, p, 30); 6198 p = restgpr0 (abfd, p, 31); 6199 } 6200 bfd_put_32 (abfd, BLR, p); 6201 return p + 4; 6202 } 6203 6204 static bfd_byte * 6205 savegpr1 (bfd *abfd, bfd_byte *p, int r) 6206 { 6207 bfd_put_32 (abfd, STD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 6208 return p + 4; 6209 } 6210 6211 static bfd_byte * 6212 savegpr1_tail (bfd *abfd, bfd_byte *p, int r) 6213 { 6214 p = savegpr1 (abfd, p, r); 6215 bfd_put_32 (abfd, BLR, p); 6216 return p + 4; 6217 } 6218 6219 static bfd_byte * 6220 restgpr1 (bfd *abfd, bfd_byte *p, int r) 6221 { 6222 bfd_put_32 (abfd, LD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 6223 return p + 4; 6224 } 6225 6226 static bfd_byte * 6227 restgpr1_tail (bfd *abfd, bfd_byte *p, int r) 6228 { 6229 p = restgpr1 (abfd, p, r); 6230 bfd_put_32 (abfd, BLR, p); 6231 return p + 4; 6232 } 6233 6234 static bfd_byte * 6235 savefpr (bfd *abfd, bfd_byte *p, int r) 6236 { 6237 bfd_put_32 (abfd, STFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 6238 return p + 4; 6239 } 6240 6241 static bfd_byte * 6242 savefpr0_tail (bfd *abfd, bfd_byte *p, int r) 6243 { 6244 p = savefpr (abfd, p, r); 6245 bfd_put_32 (abfd, STD_R0_0R1 + 16, p); 6246 p = p + 4; 6247 bfd_put_32 (abfd, BLR, p); 6248 return p + 4; 6249 } 6250 6251 static bfd_byte * 6252 restfpr (bfd *abfd, bfd_byte *p, int r) 6253 { 6254 bfd_put_32 (abfd, LFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 6255 return p + 4; 6256 } 6257 6258 static bfd_byte * 6259 restfpr0_tail (bfd *abfd, bfd_byte *p, int r) 6260 { 6261 bfd_put_32 (abfd, LD_R0_0R1 + 16, p); 6262 p = p + 4; 6263 p = restfpr (abfd, p, r); 6264 bfd_put_32 (abfd, MTLR_R0, p); 6265 p = p + 4; 6266 if (r == 29) 6267 { 6268 p = restfpr (abfd, p, 30); 6269 p = restfpr (abfd, p, 31); 6270 } 6271 bfd_put_32 (abfd, BLR, p); 6272 return p + 4; 6273 } 6274 6275 static bfd_byte * 6276 savefpr1_tail (bfd *abfd, bfd_byte *p, int r) 6277 { 6278 p = savefpr (abfd, p, r); 6279 bfd_put_32 (abfd, BLR, p); 6280 return p + 4; 6281 } 6282 6283 static bfd_byte * 6284 restfpr1_tail (bfd *abfd, bfd_byte *p, int r) 6285 { 6286 p = restfpr (abfd, p, r); 6287 bfd_put_32 (abfd, BLR, p); 6288 return p + 4; 6289 } 6290 6291 static bfd_byte * 6292 savevr (bfd *abfd, bfd_byte *p, int r) 6293 { 6294 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p); 6295 p = p + 4; 6296 bfd_put_32 (abfd, STVX_VR0_R12_R0 + (r << 21), p); 6297 return p + 4; 6298 } 6299 6300 static bfd_byte * 6301 savevr_tail (bfd *abfd, bfd_byte *p, int r) 6302 { 6303 p = savevr (abfd, p, r); 6304 bfd_put_32 (abfd, BLR, p); 6305 return p + 4; 6306 } 6307 6308 static bfd_byte * 6309 restvr (bfd *abfd, bfd_byte *p, int r) 6310 { 6311 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p); 6312 p = p + 4; 6313 bfd_put_32 (abfd, LVX_VR0_R12_R0 + (r << 21), p); 6314 return p + 4; 6315 } 6316 6317 static bfd_byte * 6318 restvr_tail (bfd *abfd, bfd_byte *p, int r) 6319 { 6320 p = restvr (abfd, p, r); 6321 bfd_put_32 (abfd, BLR, p); 6322 return p + 4; 6323 } 6324 6325 /* Called via elf_link_hash_traverse to transfer dynamic linking 6326 information on function code symbol entries to their corresponding 6327 function descriptor symbol entries. */ 6328 6329 static bfd_boolean 6330 func_desc_adjust (struct elf_link_hash_entry *h, void *inf) 6331 { 6332 struct bfd_link_info *info; 6333 struct ppc_link_hash_table *htab; 6334 struct plt_entry *ent; 6335 struct ppc_link_hash_entry *fh; 6336 struct ppc_link_hash_entry *fdh; 6337 bfd_boolean force_local; 6338 6339 fh = (struct ppc_link_hash_entry *) h; 6340 if (fh->elf.root.type == bfd_link_hash_indirect) 6341 return TRUE; 6342 6343 info = inf; 6344 htab = ppc_hash_table (info); 6345 if (htab == NULL) 6346 return FALSE; 6347 6348 /* Resolve undefined references to dot-symbols as the value 6349 in the function descriptor, if we have one in a regular object. 6350 This is to satisfy cases like ".quad .foo". Calls to functions 6351 in dynamic objects are handled elsewhere. */ 6352 if (fh->elf.root.type == bfd_link_hash_undefweak 6353 && fh->was_undefined 6354 && (fdh = defined_func_desc (fh)) != NULL 6355 && get_opd_info (fdh->elf.root.u.def.section) != NULL 6356 && opd_entry_value (fdh->elf.root.u.def.section, 6357 fdh->elf.root.u.def.value, 6358 &fh->elf.root.u.def.section, 6359 &fh->elf.root.u.def.value, FALSE) != (bfd_vma) -1) 6360 { 6361 fh->elf.root.type = fdh->elf.root.type; 6362 fh->elf.forced_local = 1; 6363 fh->elf.def_regular = fdh->elf.def_regular; 6364 fh->elf.def_dynamic = fdh->elf.def_dynamic; 6365 } 6366 6367 /* If this is a function code symbol, transfer dynamic linking 6368 information to the function descriptor symbol. */ 6369 if (!fh->is_func) 6370 return TRUE; 6371 6372 for (ent = fh->elf.plt.plist; ent != NULL; ent = ent->next) 6373 if (ent->plt.refcount > 0) 6374 break; 6375 if (ent == NULL 6376 || fh->elf.root.root.string[0] != '.' 6377 || fh->elf.root.root.string[1] == '\0') 6378 return TRUE; 6379 6380 /* Find the corresponding function descriptor symbol. Create it 6381 as undefined if necessary. */ 6382 6383 fdh = lookup_fdh (fh, htab); 6384 if (fdh == NULL 6385 && !info->executable 6386 && (fh->elf.root.type == bfd_link_hash_undefined 6387 || fh->elf.root.type == bfd_link_hash_undefweak)) 6388 { 6389 fdh = make_fdh (info, fh); 6390 if (fdh == NULL) 6391 return FALSE; 6392 } 6393 6394 /* Fake function descriptors are made undefweak. If the function 6395 code symbol is strong undefined, make the fake sym the same. 6396 If the function code symbol is defined, then force the fake 6397 descriptor local; We can't support overriding of symbols in a 6398 shared library on a fake descriptor. */ 6399 6400 if (fdh != NULL 6401 && fdh->fake 6402 && fdh->elf.root.type == bfd_link_hash_undefweak) 6403 { 6404 if (fh->elf.root.type == bfd_link_hash_undefined) 6405 { 6406 fdh->elf.root.type = bfd_link_hash_undefined; 6407 bfd_link_add_undef (&htab->elf.root, &fdh->elf.root); 6408 } 6409 else if (fh->elf.root.type == bfd_link_hash_defined 6410 || fh->elf.root.type == bfd_link_hash_defweak) 6411 { 6412 _bfd_elf_link_hash_hide_symbol (info, &fdh->elf, TRUE); 6413 } 6414 } 6415 6416 if (fdh != NULL 6417 && !fdh->elf.forced_local 6418 && (!info->executable 6419 || fdh->elf.def_dynamic 6420 || fdh->elf.ref_dynamic 6421 || (fdh->elf.root.type == bfd_link_hash_undefweak 6422 && ELF_ST_VISIBILITY (fdh->elf.other) == STV_DEFAULT))) 6423 { 6424 if (fdh->elf.dynindx == -1) 6425 if (! bfd_elf_link_record_dynamic_symbol (info, &fdh->elf)) 6426 return FALSE; 6427 fdh->elf.ref_regular |= fh->elf.ref_regular; 6428 fdh->elf.ref_dynamic |= fh->elf.ref_dynamic; 6429 fdh->elf.ref_regular_nonweak |= fh->elf.ref_regular_nonweak; 6430 fdh->elf.non_got_ref |= fh->elf.non_got_ref; 6431 if (ELF_ST_VISIBILITY (fh->elf.other) == STV_DEFAULT) 6432 { 6433 move_plt_plist (fh, fdh); 6434 fdh->elf.needs_plt = 1; 6435 } 6436 fdh->is_func_descriptor = 1; 6437 fdh->oh = fh; 6438 fh->oh = fdh; 6439 } 6440 6441 /* Now that the info is on the function descriptor, clear the 6442 function code sym info. Any function code syms for which we 6443 don't have a definition in a regular file, we force local. 6444 This prevents a shared library from exporting syms that have 6445 been imported from another library. Function code syms that 6446 are really in the library we must leave global to prevent the 6447 linker dragging in a definition from a static library. */ 6448 force_local = (!fh->elf.def_regular 6449 || fdh == NULL 6450 || !fdh->elf.def_regular 6451 || fdh->elf.forced_local); 6452 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local); 6453 6454 return TRUE; 6455 } 6456 6457 /* Called near the start of bfd_elf_size_dynamic_sections. We use 6458 this hook to a) provide some gcc support functions, and b) transfer 6459 dynamic linking information gathered so far on function code symbol 6460 entries, to their corresponding function descriptor symbol entries. */ 6461 6462 static bfd_boolean 6463 ppc64_elf_func_desc_adjust (bfd *obfd ATTRIBUTE_UNUSED, 6464 struct bfd_link_info *info) 6465 { 6466 struct ppc_link_hash_table *htab; 6467 unsigned int i; 6468 static const struct sfpr_def_parms funcs[] = 6469 { 6470 { "_savegpr0_", 14, 31, savegpr0, savegpr0_tail }, 6471 { "_restgpr0_", 14, 29, restgpr0, restgpr0_tail }, 6472 { "_restgpr0_", 30, 31, restgpr0, restgpr0_tail }, 6473 { "_savegpr1_", 14, 31, savegpr1, savegpr1_tail }, 6474 { "_restgpr1_", 14, 31, restgpr1, restgpr1_tail }, 6475 { "_savefpr_", 14, 31, savefpr, savefpr0_tail }, 6476 { "_restfpr_", 14, 29, restfpr, restfpr0_tail }, 6477 { "_restfpr_", 30, 31, restfpr, restfpr0_tail }, 6478 { "._savef", 14, 31, savefpr, savefpr1_tail }, 6479 { "._restf", 14, 31, restfpr, restfpr1_tail }, 6480 { "_savevr_", 20, 31, savevr, savevr_tail }, 6481 { "_restvr_", 20, 31, restvr, restvr_tail } 6482 }; 6483 6484 htab = ppc_hash_table (info); 6485 if (htab == NULL) 6486 return FALSE; 6487 6488 if (htab->sfpr == NULL) 6489 /* We don't have any relocs. */ 6490 return TRUE; 6491 6492 /* Provide any missing _save* and _rest* functions. */ 6493 htab->sfpr->size = 0; 6494 if (!info->relocatable) 6495 for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++) 6496 if (!sfpr_define (info, &funcs[i])) 6497 return FALSE; 6498 6499 elf_link_hash_traverse (&htab->elf, func_desc_adjust, info); 6500 6501 if (htab->sfpr->size == 0) 6502 htab->sfpr->flags |= SEC_EXCLUDE; 6503 6504 return TRUE; 6505 } 6506 6507 /* Adjust a symbol defined by a dynamic object and referenced by a 6508 regular object. The current definition is in some section of the 6509 dynamic object, but we're not including those sections. We have to 6510 change the definition to something the rest of the link can 6511 understand. */ 6512 6513 static bfd_boolean 6514 ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info, 6515 struct elf_link_hash_entry *h) 6516 { 6517 struct ppc_link_hash_table *htab; 6518 asection *s; 6519 6520 htab = ppc_hash_table (info); 6521 if (htab == NULL) 6522 return FALSE; 6523 6524 /* Deal with function syms. */ 6525 if (h->type == STT_FUNC 6526 || h->type == STT_GNU_IFUNC 6527 || h->needs_plt) 6528 { 6529 /* Clear procedure linkage table information for any symbol that 6530 won't need a .plt entry. */ 6531 struct plt_entry *ent; 6532 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 6533 if (ent->plt.refcount > 0) 6534 break; 6535 if (ent == NULL 6536 || (h->type != STT_GNU_IFUNC 6537 && (SYMBOL_CALLS_LOCAL (info, h) 6538 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 6539 && h->root.type == bfd_link_hash_undefweak)))) 6540 { 6541 h->plt.plist = NULL; 6542 h->needs_plt = 0; 6543 } 6544 } 6545 else 6546 h->plt.plist = NULL; 6547 6548 /* If this is a weak symbol, and there is a real definition, the 6549 processor independent code will have arranged for us to see the 6550 real definition first, and we can just use the same value. */ 6551 if (h->u.weakdef != NULL) 6552 { 6553 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 6554 || h->u.weakdef->root.type == bfd_link_hash_defweak); 6555 h->root.u.def.section = h->u.weakdef->root.u.def.section; 6556 h->root.u.def.value = h->u.weakdef->root.u.def.value; 6557 if (ELIMINATE_COPY_RELOCS) 6558 h->non_got_ref = h->u.weakdef->non_got_ref; 6559 return TRUE; 6560 } 6561 6562 /* If we are creating a shared library, we must presume that the 6563 only references to the symbol are via the global offset table. 6564 For such cases we need not do anything here; the relocations will 6565 be handled correctly by relocate_section. */ 6566 if (info->shared) 6567 return TRUE; 6568 6569 /* If there are no references to this symbol that do not use the 6570 GOT, we don't need to generate a copy reloc. */ 6571 if (!h->non_got_ref) 6572 return TRUE; 6573 6574 /* Don't generate a copy reloc for symbols defined in the executable. */ 6575 if (!h->def_dynamic || !h->ref_regular || h->def_regular) 6576 return TRUE; 6577 6578 if (ELIMINATE_COPY_RELOCS) 6579 { 6580 struct ppc_link_hash_entry * eh; 6581 struct elf_dyn_relocs *p; 6582 6583 eh = (struct ppc_link_hash_entry *) h; 6584 for (p = eh->dyn_relocs; p != NULL; p = p->next) 6585 { 6586 s = p->sec->output_section; 6587 if (s != NULL && (s->flags & SEC_READONLY) != 0) 6588 break; 6589 } 6590 6591 /* If we didn't find any dynamic relocs in read-only sections, then 6592 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 6593 if (p == NULL) 6594 { 6595 h->non_got_ref = 0; 6596 return TRUE; 6597 } 6598 } 6599 6600 if (h->plt.plist != NULL) 6601 { 6602 /* We should never get here, but unfortunately there are versions 6603 of gcc out there that improperly (for this ABI) put initialized 6604 function pointers, vtable refs and suchlike in read-only 6605 sections. Allow them to proceed, but warn that this might 6606 break at runtime. */ 6607 info->callbacks->einfo 6608 (_("%P: copy reloc against `%T' requires lazy plt linking; " 6609 "avoid setting LD_BIND_NOW=1 or upgrade gcc\n"), 6610 h->root.root.string); 6611 } 6612 6613 /* This is a reference to a symbol defined by a dynamic object which 6614 is not a function. */ 6615 6616 /* We must allocate the symbol in our .dynbss section, which will 6617 become part of the .bss section of the executable. There will be 6618 an entry for this symbol in the .dynsym section. The dynamic 6619 object will contain position independent code, so all references 6620 from the dynamic object to this symbol will go through the global 6621 offset table. The dynamic linker will use the .dynsym entry to 6622 determine the address it must put in the global offset table, so 6623 both the dynamic object and the regular object will refer to the 6624 same memory location for the variable. */ 6625 6626 /* We must generate a R_PPC64_COPY reloc to tell the dynamic linker 6627 to copy the initial value out of the dynamic object and into the 6628 runtime process image. We need to remember the offset into the 6629 .rela.bss section we are going to use. */ 6630 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 6631 { 6632 htab->relbss->size += sizeof (Elf64_External_Rela); 6633 h->needs_copy = 1; 6634 } 6635 6636 s = htab->dynbss; 6637 6638 return _bfd_elf_adjust_dynamic_copy (h, s); 6639 } 6640 6641 /* If given a function descriptor symbol, hide both the function code 6642 sym and the descriptor. */ 6643 static void 6644 ppc64_elf_hide_symbol (struct bfd_link_info *info, 6645 struct elf_link_hash_entry *h, 6646 bfd_boolean force_local) 6647 { 6648 struct ppc_link_hash_entry *eh; 6649 _bfd_elf_link_hash_hide_symbol (info, h, force_local); 6650 6651 eh = (struct ppc_link_hash_entry *) h; 6652 if (eh->is_func_descriptor) 6653 { 6654 struct ppc_link_hash_entry *fh = eh->oh; 6655 6656 if (fh == NULL) 6657 { 6658 const char *p, *q; 6659 struct ppc_link_hash_table *htab; 6660 char save; 6661 6662 /* We aren't supposed to use alloca in BFD because on 6663 systems which do not have alloca the version in libiberty 6664 calls xmalloc, which might cause the program to crash 6665 when it runs out of memory. This function doesn't have a 6666 return status, so there's no way to gracefully return an 6667 error. So cheat. We know that string[-1] can be safely 6668 accessed; It's either a string in an ELF string table, 6669 or allocated in an objalloc structure. */ 6670 6671 p = eh->elf.root.root.string - 1; 6672 save = *p; 6673 *(char *) p = '.'; 6674 htab = ppc_hash_table (info); 6675 if (htab == NULL) 6676 return; 6677 6678 fh = (struct ppc_link_hash_entry *) 6679 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE); 6680 *(char *) p = save; 6681 6682 /* Unfortunately, if it so happens that the string we were 6683 looking for was allocated immediately before this string, 6684 then we overwrote the string terminator. That's the only 6685 reason the lookup should fail. */ 6686 if (fh == NULL) 6687 { 6688 q = eh->elf.root.root.string + strlen (eh->elf.root.root.string); 6689 while (q >= eh->elf.root.root.string && *q == *p) 6690 --q, --p; 6691 if (q < eh->elf.root.root.string && *p == '.') 6692 fh = (struct ppc_link_hash_entry *) 6693 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE); 6694 } 6695 if (fh != NULL) 6696 { 6697 eh->oh = fh; 6698 fh->oh = eh; 6699 } 6700 } 6701 if (fh != NULL) 6702 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local); 6703 } 6704 } 6705 6706 static bfd_boolean 6707 get_sym_h (struct elf_link_hash_entry **hp, 6708 Elf_Internal_Sym **symp, 6709 asection **symsecp, 6710 unsigned char **tls_maskp, 6711 Elf_Internal_Sym **locsymsp, 6712 unsigned long r_symndx, 6713 bfd *ibfd) 6714 { 6715 Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (ibfd); 6716 6717 if (r_symndx >= symtab_hdr->sh_info) 6718 { 6719 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd); 6720 struct elf_link_hash_entry *h; 6721 6722 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 6723 h = elf_follow_link (h); 6724 6725 if (hp != NULL) 6726 *hp = h; 6727 6728 if (symp != NULL) 6729 *symp = NULL; 6730 6731 if (symsecp != NULL) 6732 { 6733 asection *symsec = NULL; 6734 if (h->root.type == bfd_link_hash_defined 6735 || h->root.type == bfd_link_hash_defweak) 6736 symsec = h->root.u.def.section; 6737 *symsecp = symsec; 6738 } 6739 6740 if (tls_maskp != NULL) 6741 { 6742 struct ppc_link_hash_entry *eh; 6743 6744 eh = (struct ppc_link_hash_entry *) h; 6745 *tls_maskp = &eh->tls_mask; 6746 } 6747 } 6748 else 6749 { 6750 Elf_Internal_Sym *sym; 6751 Elf_Internal_Sym *locsyms = *locsymsp; 6752 6753 if (locsyms == NULL) 6754 { 6755 locsyms = (Elf_Internal_Sym *) symtab_hdr->contents; 6756 if (locsyms == NULL) 6757 locsyms = bfd_elf_get_elf_syms (ibfd, symtab_hdr, 6758 symtab_hdr->sh_info, 6759 0, NULL, NULL, NULL); 6760 if (locsyms == NULL) 6761 return FALSE; 6762 *locsymsp = locsyms; 6763 } 6764 sym = locsyms + r_symndx; 6765 6766 if (hp != NULL) 6767 *hp = NULL; 6768 6769 if (symp != NULL) 6770 *symp = sym; 6771 6772 if (symsecp != NULL) 6773 *symsecp = bfd_section_from_elf_index (ibfd, sym->st_shndx); 6774 6775 if (tls_maskp != NULL) 6776 { 6777 struct got_entry **lgot_ents; 6778 unsigned char *tls_mask; 6779 6780 tls_mask = NULL; 6781 lgot_ents = elf_local_got_ents (ibfd); 6782 if (lgot_ents != NULL) 6783 { 6784 struct plt_entry **local_plt = (struct plt_entry **) 6785 (lgot_ents + symtab_hdr->sh_info); 6786 unsigned char *lgot_masks = (unsigned char *) 6787 (local_plt + symtab_hdr->sh_info); 6788 tls_mask = &lgot_masks[r_symndx]; 6789 } 6790 *tls_maskp = tls_mask; 6791 } 6792 } 6793 return TRUE; 6794 } 6795 6796 /* Returns TLS_MASKP for the given REL symbol. Function return is 0 on 6797 error, 2 on a toc GD type suitable for optimization, 3 on a toc LD 6798 type suitable for optimization, and 1 otherwise. */ 6799 6800 static int 6801 get_tls_mask (unsigned char **tls_maskp, 6802 unsigned long *toc_symndx, 6803 bfd_vma *toc_addend, 6804 Elf_Internal_Sym **locsymsp, 6805 const Elf_Internal_Rela *rel, 6806 bfd *ibfd) 6807 { 6808 unsigned long r_symndx; 6809 int next_r; 6810 struct elf_link_hash_entry *h; 6811 Elf_Internal_Sym *sym; 6812 asection *sec; 6813 bfd_vma off; 6814 6815 r_symndx = ELF64_R_SYM (rel->r_info); 6816 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd)) 6817 return 0; 6818 6819 if ((*tls_maskp != NULL && **tls_maskp != 0) 6820 || sec == NULL 6821 || ppc64_elf_section_data (sec) == NULL 6822 || ppc64_elf_section_data (sec)->sec_type != sec_toc) 6823 return 1; 6824 6825 /* Look inside a TOC section too. */ 6826 if (h != NULL) 6827 { 6828 BFD_ASSERT (h->root.type == bfd_link_hash_defined); 6829 off = h->root.u.def.value; 6830 } 6831 else 6832 off = sym->st_value; 6833 off += rel->r_addend; 6834 BFD_ASSERT (off % 8 == 0); 6835 r_symndx = ppc64_elf_section_data (sec)->u.toc.symndx[off / 8]; 6836 next_r = ppc64_elf_section_data (sec)->u.toc.symndx[off / 8 + 1]; 6837 if (toc_symndx != NULL) 6838 *toc_symndx = r_symndx; 6839 if (toc_addend != NULL) 6840 *toc_addend = ppc64_elf_section_data (sec)->u.toc.add[off / 8]; 6841 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd)) 6842 return 0; 6843 if ((h == NULL || is_static_defined (h)) 6844 && (next_r == -1 || next_r == -2)) 6845 return 1 - next_r; 6846 return 1; 6847 } 6848 6849 /* Find (or create) an entry in the tocsave hash table. */ 6850 6851 static struct tocsave_entry * 6852 tocsave_find (struct ppc_link_hash_table *htab, 6853 enum insert_option insert, 6854 Elf_Internal_Sym **local_syms, 6855 const Elf_Internal_Rela *irela, 6856 bfd *ibfd) 6857 { 6858 unsigned long r_indx; 6859 struct elf_link_hash_entry *h; 6860 Elf_Internal_Sym *sym; 6861 struct tocsave_entry ent, *p; 6862 hashval_t hash; 6863 struct tocsave_entry **slot; 6864 6865 r_indx = ELF64_R_SYM (irela->r_info); 6866 if (!get_sym_h (&h, &sym, &ent.sec, NULL, local_syms, r_indx, ibfd)) 6867 return NULL; 6868 if (ent.sec == NULL || ent.sec->output_section == NULL) 6869 { 6870 (*_bfd_error_handler) 6871 (_("%B: undefined symbol on R_PPC64_TOCSAVE relocation")); 6872 return NULL; 6873 } 6874 6875 if (h != NULL) 6876 ent.offset = h->root.u.def.value; 6877 else 6878 ent.offset = sym->st_value; 6879 ent.offset += irela->r_addend; 6880 6881 hash = tocsave_htab_hash (&ent); 6882 slot = ((struct tocsave_entry **) 6883 htab_find_slot_with_hash (htab->tocsave_htab, &ent, hash, insert)); 6884 if (slot == NULL) 6885 return NULL; 6886 6887 if (*slot == NULL) 6888 { 6889 p = (struct tocsave_entry *) bfd_alloc (ibfd, sizeof (*p)); 6890 if (p == NULL) 6891 return NULL; 6892 *p = ent; 6893 *slot = p; 6894 } 6895 return *slot; 6896 } 6897 6898 /* Adjust all global syms defined in opd sections. In gcc generated 6899 code for the old ABI, these will already have been done. */ 6900 6901 static bfd_boolean 6902 adjust_opd_syms (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) 6903 { 6904 struct ppc_link_hash_entry *eh; 6905 asection *sym_sec; 6906 struct _opd_sec_data *opd; 6907 6908 if (h->root.type == bfd_link_hash_indirect) 6909 return TRUE; 6910 6911 if (h->root.type != bfd_link_hash_defined 6912 && h->root.type != bfd_link_hash_defweak) 6913 return TRUE; 6914 6915 eh = (struct ppc_link_hash_entry *) h; 6916 if (eh->adjust_done) 6917 return TRUE; 6918 6919 sym_sec = eh->elf.root.u.def.section; 6920 opd = get_opd_info (sym_sec); 6921 if (opd != NULL && opd->adjust != NULL) 6922 { 6923 long adjust = opd->adjust[eh->elf.root.u.def.value / 8]; 6924 if (adjust == -1) 6925 { 6926 /* This entry has been deleted. */ 6927 asection *dsec = ppc64_elf_tdata (sym_sec->owner)->deleted_section; 6928 if (dsec == NULL) 6929 { 6930 for (dsec = sym_sec->owner->sections; dsec; dsec = dsec->next) 6931 if (discarded_section (dsec)) 6932 { 6933 ppc64_elf_tdata (sym_sec->owner)->deleted_section = dsec; 6934 break; 6935 } 6936 } 6937 eh->elf.root.u.def.value = 0; 6938 eh->elf.root.u.def.section = dsec; 6939 } 6940 else 6941 eh->elf.root.u.def.value += adjust; 6942 eh->adjust_done = 1; 6943 } 6944 return TRUE; 6945 } 6946 6947 /* Handles decrementing dynamic reloc counts for the reloc specified by 6948 R_INFO in section SEC. If LOCAL_SYMS is NULL, then H and SYM_SEC 6949 have already been determined. */ 6950 6951 static bfd_boolean 6952 dec_dynrel_count (bfd_vma r_info, 6953 asection *sec, 6954 struct bfd_link_info *info, 6955 Elf_Internal_Sym **local_syms, 6956 struct elf_link_hash_entry *h, 6957 asection *sym_sec) 6958 { 6959 enum elf_ppc64_reloc_type r_type; 6960 struct elf_dyn_relocs *p; 6961 struct elf_dyn_relocs **pp; 6962 6963 /* Can this reloc be dynamic? This switch, and later tests here 6964 should be kept in sync with the code in check_relocs. */ 6965 r_type = ELF64_R_TYPE (r_info); 6966 switch (r_type) 6967 { 6968 default: 6969 return TRUE; 6970 6971 case R_PPC64_TPREL16: 6972 case R_PPC64_TPREL16_LO: 6973 case R_PPC64_TPREL16_HI: 6974 case R_PPC64_TPREL16_HA: 6975 case R_PPC64_TPREL16_DS: 6976 case R_PPC64_TPREL16_LO_DS: 6977 case R_PPC64_TPREL16_HIGHER: 6978 case R_PPC64_TPREL16_HIGHERA: 6979 case R_PPC64_TPREL16_HIGHEST: 6980 case R_PPC64_TPREL16_HIGHESTA: 6981 if (!info->shared) 6982 return TRUE; 6983 6984 case R_PPC64_TPREL64: 6985 case R_PPC64_DTPMOD64: 6986 case R_PPC64_DTPREL64: 6987 case R_PPC64_ADDR64: 6988 case R_PPC64_REL30: 6989 case R_PPC64_REL32: 6990 case R_PPC64_REL64: 6991 case R_PPC64_ADDR14: 6992 case R_PPC64_ADDR14_BRNTAKEN: 6993 case R_PPC64_ADDR14_BRTAKEN: 6994 case R_PPC64_ADDR16: 6995 case R_PPC64_ADDR16_DS: 6996 case R_PPC64_ADDR16_HA: 6997 case R_PPC64_ADDR16_HI: 6998 case R_PPC64_ADDR16_HIGHER: 6999 case R_PPC64_ADDR16_HIGHERA: 7000 case R_PPC64_ADDR16_HIGHEST: 7001 case R_PPC64_ADDR16_HIGHESTA: 7002 case R_PPC64_ADDR16_LO: 7003 case R_PPC64_ADDR16_LO_DS: 7004 case R_PPC64_ADDR24: 7005 case R_PPC64_ADDR32: 7006 case R_PPC64_UADDR16: 7007 case R_PPC64_UADDR32: 7008 case R_PPC64_UADDR64: 7009 case R_PPC64_TOC: 7010 break; 7011 } 7012 7013 if (local_syms != NULL) 7014 { 7015 unsigned long r_symndx; 7016 Elf_Internal_Sym *sym; 7017 bfd *ibfd = sec->owner; 7018 7019 r_symndx = ELF64_R_SYM (r_info); 7020 if (!get_sym_h (&h, &sym, &sym_sec, NULL, local_syms, r_symndx, ibfd)) 7021 return FALSE; 7022 } 7023 7024 if ((info->shared 7025 && (must_be_dyn_reloc (info, r_type) 7026 || (h != NULL 7027 && (!info->symbolic 7028 || h->root.type == bfd_link_hash_defweak 7029 || !h->def_regular)))) 7030 || (ELIMINATE_COPY_RELOCS 7031 && !info->shared 7032 && h != NULL 7033 && (h->root.type == bfd_link_hash_defweak 7034 || !h->def_regular))) 7035 ; 7036 else 7037 return TRUE; 7038 7039 if (h != NULL) 7040 pp = &((struct ppc_link_hash_entry *) h)->dyn_relocs; 7041 else 7042 { 7043 if (sym_sec != NULL) 7044 { 7045 void *vpp = &elf_section_data (sym_sec)->local_dynrel; 7046 pp = (struct elf_dyn_relocs **) vpp; 7047 } 7048 else 7049 { 7050 void *vpp = &elf_section_data (sec)->local_dynrel; 7051 pp = (struct elf_dyn_relocs **) vpp; 7052 } 7053 } 7054 7055 /* elf_gc_sweep may have already removed all dyn relocs associated 7056 with local syms for a given section. Also, symbol flags are 7057 changed by elf_gc_sweep_symbol, confusing the test above. Don't 7058 report a dynreloc miscount. */ 7059 if (*pp == NULL && info->gc_sections) 7060 return TRUE; 7061 7062 while ((p = *pp) != NULL) 7063 { 7064 if (p->sec == sec) 7065 { 7066 if (!must_be_dyn_reloc (info, r_type)) 7067 p->pc_count -= 1; 7068 p->count -= 1; 7069 if (p->count == 0) 7070 *pp = p->next; 7071 return TRUE; 7072 } 7073 pp = &p->next; 7074 } 7075 7076 info->callbacks->einfo (_("%P: dynreloc miscount for %B, section %A\n"), 7077 sec->owner, sec); 7078 bfd_set_error (bfd_error_bad_value); 7079 return FALSE; 7080 } 7081 7082 /* Remove unused Official Procedure Descriptor entries. Currently we 7083 only remove those associated with functions in discarded link-once 7084 sections, or weakly defined functions that have been overridden. It 7085 would be possible to remove many more entries for statically linked 7086 applications. */ 7087 7088 bfd_boolean 7089 ppc64_elf_edit_opd (struct bfd_link_info *info, bfd_boolean non_overlapping) 7090 { 7091 bfd *ibfd; 7092 bfd_boolean some_edited = FALSE; 7093 asection *need_pad = NULL; 7094 7095 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 7096 { 7097 asection *sec; 7098 Elf_Internal_Rela *relstart, *rel, *relend; 7099 Elf_Internal_Shdr *symtab_hdr; 7100 Elf_Internal_Sym *local_syms; 7101 bfd_vma offset; 7102 struct _opd_sec_data *opd; 7103 bfd_boolean need_edit, add_aux_fields; 7104 bfd_size_type cnt_16b = 0; 7105 7106 if (!is_ppc64_elf (ibfd)) 7107 continue; 7108 7109 sec = bfd_get_section_by_name (ibfd, ".opd"); 7110 if (sec == NULL || sec->size == 0) 7111 continue; 7112 7113 if (sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS) 7114 continue; 7115 7116 if (sec->output_section == bfd_abs_section_ptr) 7117 continue; 7118 7119 /* Look through the section relocs. */ 7120 if ((sec->flags & SEC_RELOC) == 0 || sec->reloc_count == 0) 7121 continue; 7122 7123 local_syms = NULL; 7124 symtab_hdr = &elf_symtab_hdr (ibfd); 7125 7126 /* Read the relocations. */ 7127 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 7128 info->keep_memory); 7129 if (relstart == NULL) 7130 return FALSE; 7131 7132 /* First run through the relocs to check they are sane, and to 7133 determine whether we need to edit this opd section. */ 7134 need_edit = FALSE; 7135 need_pad = sec; 7136 offset = 0; 7137 relend = relstart + sec->reloc_count; 7138 for (rel = relstart; rel < relend; ) 7139 { 7140 enum elf_ppc64_reloc_type r_type; 7141 unsigned long r_symndx; 7142 asection *sym_sec; 7143 struct elf_link_hash_entry *h; 7144 Elf_Internal_Sym *sym; 7145 7146 /* .opd contains a regular array of 16 or 24 byte entries. We're 7147 only interested in the reloc pointing to a function entry 7148 point. */ 7149 if (rel->r_offset != offset 7150 || rel + 1 >= relend 7151 || (rel + 1)->r_offset != offset + 8) 7152 { 7153 /* If someone messes with .opd alignment then after a 7154 "ld -r" we might have padding in the middle of .opd. 7155 Also, there's nothing to prevent someone putting 7156 something silly in .opd with the assembler. No .opd 7157 optimization for them! */ 7158 broken_opd: 7159 (*_bfd_error_handler) 7160 (_("%B: .opd is not a regular array of opd entries"), ibfd); 7161 need_edit = FALSE; 7162 break; 7163 } 7164 7165 if ((r_type = ELF64_R_TYPE (rel->r_info)) != R_PPC64_ADDR64 7166 || (r_type = ELF64_R_TYPE ((rel + 1)->r_info)) != R_PPC64_TOC) 7167 { 7168 (*_bfd_error_handler) 7169 (_("%B: unexpected reloc type %u in .opd section"), 7170 ibfd, r_type); 7171 need_edit = FALSE; 7172 break; 7173 } 7174 7175 r_symndx = ELF64_R_SYM (rel->r_info); 7176 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7177 r_symndx, ibfd)) 7178 goto error_ret; 7179 7180 if (sym_sec == NULL || sym_sec->owner == NULL) 7181 { 7182 const char *sym_name; 7183 if (h != NULL) 7184 sym_name = h->root.root.string; 7185 else 7186 sym_name = bfd_elf_sym_name (ibfd, symtab_hdr, sym, 7187 sym_sec); 7188 7189 (*_bfd_error_handler) 7190 (_("%B: undefined sym `%s' in .opd section"), 7191 ibfd, sym_name); 7192 need_edit = FALSE; 7193 break; 7194 } 7195 7196 /* opd entries are always for functions defined in the 7197 current input bfd. If the symbol isn't defined in the 7198 input bfd, then we won't be using the function in this 7199 bfd; It must be defined in a linkonce section in another 7200 bfd, or is weak. It's also possible that we are 7201 discarding the function due to a linker script /DISCARD/, 7202 which we test for via the output_section. */ 7203 if (sym_sec->owner != ibfd 7204 || sym_sec->output_section == bfd_abs_section_ptr) 7205 need_edit = TRUE; 7206 7207 rel += 2; 7208 if (rel == relend 7209 || (rel + 1 == relend && rel->r_offset == offset + 16)) 7210 { 7211 if (sec->size == offset + 24) 7212 { 7213 need_pad = NULL; 7214 break; 7215 } 7216 if (rel == relend && sec->size == offset + 16) 7217 { 7218 cnt_16b++; 7219 break; 7220 } 7221 goto broken_opd; 7222 } 7223 7224 if (rel->r_offset == offset + 24) 7225 offset += 24; 7226 else if (rel->r_offset != offset + 16) 7227 goto broken_opd; 7228 else if (rel + 1 < relend 7229 && ELF64_R_TYPE (rel[0].r_info) == R_PPC64_ADDR64 7230 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_TOC) 7231 { 7232 offset += 16; 7233 cnt_16b++; 7234 } 7235 else if (rel + 2 < relend 7236 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_ADDR64 7237 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_TOC) 7238 { 7239 offset += 24; 7240 rel += 1; 7241 } 7242 else 7243 goto broken_opd; 7244 } 7245 7246 add_aux_fields = non_overlapping && cnt_16b > 0; 7247 7248 if (need_edit || add_aux_fields) 7249 { 7250 Elf_Internal_Rela *write_rel; 7251 Elf_Internal_Shdr *rel_hdr; 7252 bfd_byte *rptr, *wptr; 7253 bfd_byte *new_contents; 7254 bfd_boolean skip; 7255 long opd_ent_size; 7256 bfd_size_type amt; 7257 7258 new_contents = NULL; 7259 amt = sec->size * sizeof (long) / 8; 7260 opd = &ppc64_elf_section_data (sec)->u.opd; 7261 opd->adjust = bfd_zalloc (sec->owner, amt); 7262 if (opd->adjust == NULL) 7263 return FALSE; 7264 ppc64_elf_section_data (sec)->sec_type = sec_opd; 7265 7266 /* This seems a waste of time as input .opd sections are all 7267 zeros as generated by gcc, but I suppose there's no reason 7268 this will always be so. We might start putting something in 7269 the third word of .opd entries. */ 7270 if ((sec->flags & SEC_IN_MEMORY) == 0) 7271 { 7272 bfd_byte *loc; 7273 if (!bfd_malloc_and_get_section (ibfd, sec, &loc)) 7274 { 7275 if (loc != NULL) 7276 free (loc); 7277 error_ret: 7278 if (local_syms != NULL 7279 && symtab_hdr->contents != (unsigned char *) local_syms) 7280 free (local_syms); 7281 if (elf_section_data (sec)->relocs != relstart) 7282 free (relstart); 7283 return FALSE; 7284 } 7285 sec->contents = loc; 7286 sec->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS); 7287 } 7288 7289 elf_section_data (sec)->relocs = relstart; 7290 7291 new_contents = sec->contents; 7292 if (add_aux_fields) 7293 { 7294 new_contents = bfd_malloc (sec->size + cnt_16b * 8); 7295 if (new_contents == NULL) 7296 return FALSE; 7297 need_pad = FALSE; 7298 } 7299 wptr = new_contents; 7300 rptr = sec->contents; 7301 7302 write_rel = relstart; 7303 skip = FALSE; 7304 offset = 0; 7305 opd_ent_size = 0; 7306 for (rel = relstart; rel < relend; rel++) 7307 { 7308 unsigned long r_symndx; 7309 asection *sym_sec; 7310 struct elf_link_hash_entry *h; 7311 Elf_Internal_Sym *sym; 7312 7313 r_symndx = ELF64_R_SYM (rel->r_info); 7314 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7315 r_symndx, ibfd)) 7316 goto error_ret; 7317 7318 if (rel->r_offset == offset) 7319 { 7320 struct ppc_link_hash_entry *fdh = NULL; 7321 7322 /* See if the .opd entry is full 24 byte or 7323 16 byte (with fd_aux entry overlapped with next 7324 fd_func). */ 7325 opd_ent_size = 24; 7326 if ((rel + 2 == relend && sec->size == offset + 16) 7327 || (rel + 3 < relend 7328 && rel[2].r_offset == offset + 16 7329 && rel[3].r_offset == offset + 24 7330 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_ADDR64 7331 && ELF64_R_TYPE (rel[3].r_info) == R_PPC64_TOC)) 7332 opd_ent_size = 16; 7333 7334 if (h != NULL 7335 && h->root.root.string[0] == '.') 7336 { 7337 struct ppc_link_hash_table *htab; 7338 7339 htab = ppc_hash_table (info); 7340 if (htab != NULL) 7341 fdh = lookup_fdh ((struct ppc_link_hash_entry *) h, 7342 htab); 7343 if (fdh != NULL 7344 && fdh->elf.root.type != bfd_link_hash_defined 7345 && fdh->elf.root.type != bfd_link_hash_defweak) 7346 fdh = NULL; 7347 } 7348 7349 skip = (sym_sec->owner != ibfd 7350 || sym_sec->output_section == bfd_abs_section_ptr); 7351 if (skip) 7352 { 7353 if (fdh != NULL && sym_sec->owner == ibfd) 7354 { 7355 /* Arrange for the function descriptor sym 7356 to be dropped. */ 7357 fdh->elf.root.u.def.value = 0; 7358 fdh->elf.root.u.def.section = sym_sec; 7359 } 7360 opd->adjust[rel->r_offset / 8] = -1; 7361 } 7362 else 7363 { 7364 /* We'll be keeping this opd entry. */ 7365 7366 if (fdh != NULL) 7367 { 7368 /* Redefine the function descriptor symbol to 7369 this location in the opd section. It is 7370 necessary to update the value here rather 7371 than using an array of adjustments as we do 7372 for local symbols, because various places 7373 in the generic ELF code use the value 7374 stored in u.def.value. */ 7375 fdh->elf.root.u.def.value = wptr - new_contents; 7376 fdh->adjust_done = 1; 7377 } 7378 7379 /* Local syms are a bit tricky. We could 7380 tweak them as they can be cached, but 7381 we'd need to look through the local syms 7382 for the function descriptor sym which we 7383 don't have at the moment. So keep an 7384 array of adjustments. */ 7385 opd->adjust[rel->r_offset / 8] 7386 = (wptr - new_contents) - (rptr - sec->contents); 7387 7388 if (wptr != rptr) 7389 memcpy (wptr, rptr, opd_ent_size); 7390 wptr += opd_ent_size; 7391 if (add_aux_fields && opd_ent_size == 16) 7392 { 7393 memset (wptr, '\0', 8); 7394 wptr += 8; 7395 } 7396 } 7397 rptr += opd_ent_size; 7398 offset += opd_ent_size; 7399 } 7400 7401 if (skip) 7402 { 7403 if (!NO_OPD_RELOCS 7404 && !info->relocatable 7405 && !dec_dynrel_count (rel->r_info, sec, info, 7406 NULL, h, sym_sec)) 7407 goto error_ret; 7408 } 7409 else 7410 { 7411 /* We need to adjust any reloc offsets to point to the 7412 new opd entries. While we're at it, we may as well 7413 remove redundant relocs. */ 7414 rel->r_offset += opd->adjust[(offset - opd_ent_size) / 8]; 7415 if (write_rel != rel) 7416 memcpy (write_rel, rel, sizeof (*rel)); 7417 ++write_rel; 7418 } 7419 } 7420 7421 sec->size = wptr - new_contents; 7422 sec->reloc_count = write_rel - relstart; 7423 if (add_aux_fields) 7424 { 7425 free (sec->contents); 7426 sec->contents = new_contents; 7427 } 7428 7429 /* Fudge the header size too, as this is used later in 7430 elf_bfd_final_link if we are emitting relocs. */ 7431 rel_hdr = _bfd_elf_single_rel_hdr (sec); 7432 rel_hdr->sh_size = sec->reloc_count * rel_hdr->sh_entsize; 7433 some_edited = TRUE; 7434 } 7435 else if (elf_section_data (sec)->relocs != relstart) 7436 free (relstart); 7437 7438 if (local_syms != NULL 7439 && symtab_hdr->contents != (unsigned char *) local_syms) 7440 { 7441 if (!info->keep_memory) 7442 free (local_syms); 7443 else 7444 symtab_hdr->contents = (unsigned char *) local_syms; 7445 } 7446 } 7447 7448 if (some_edited) 7449 elf_link_hash_traverse (elf_hash_table (info), adjust_opd_syms, NULL); 7450 7451 /* If we are doing a final link and the last .opd entry is just 16 byte 7452 long, add a 8 byte padding after it. */ 7453 if (need_pad != NULL && !info->relocatable) 7454 { 7455 bfd_byte *p; 7456 7457 if ((need_pad->flags & SEC_IN_MEMORY) == 0) 7458 { 7459 BFD_ASSERT (need_pad->size > 0); 7460 7461 p = bfd_malloc (need_pad->size + 8); 7462 if (p == NULL) 7463 return FALSE; 7464 7465 if (! bfd_get_section_contents (need_pad->owner, need_pad, 7466 p, 0, need_pad->size)) 7467 return FALSE; 7468 7469 need_pad->contents = p; 7470 need_pad->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS); 7471 } 7472 else 7473 { 7474 p = bfd_realloc (need_pad->contents, need_pad->size + 8); 7475 if (p == NULL) 7476 return FALSE; 7477 7478 need_pad->contents = p; 7479 } 7480 7481 memset (need_pad->contents + need_pad->size, 0, 8); 7482 need_pad->size += 8; 7483 } 7484 7485 return TRUE; 7486 } 7487 7488 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */ 7489 7490 asection * 7491 ppc64_elf_tls_setup (struct bfd_link_info *info, 7492 int no_tls_get_addr_opt, 7493 int *no_multi_toc) 7494 { 7495 struct ppc_link_hash_table *htab; 7496 7497 htab = ppc_hash_table (info); 7498 if (htab == NULL) 7499 return NULL; 7500 7501 if (*no_multi_toc) 7502 htab->do_multi_toc = 0; 7503 else if (!htab->do_multi_toc) 7504 *no_multi_toc = 1; 7505 7506 htab->tls_get_addr = ((struct ppc_link_hash_entry *) 7507 elf_link_hash_lookup (&htab->elf, ".__tls_get_addr", 7508 FALSE, FALSE, TRUE)); 7509 /* Move dynamic linking info to the function descriptor sym. */ 7510 if (htab->tls_get_addr != NULL) 7511 func_desc_adjust (&htab->tls_get_addr->elf, info); 7512 htab->tls_get_addr_fd = ((struct ppc_link_hash_entry *) 7513 elf_link_hash_lookup (&htab->elf, "__tls_get_addr", 7514 FALSE, FALSE, TRUE)); 7515 if (!no_tls_get_addr_opt) 7516 { 7517 struct elf_link_hash_entry *opt, *opt_fd, *tga, *tga_fd; 7518 7519 opt = elf_link_hash_lookup (&htab->elf, ".__tls_get_addr_opt", 7520 FALSE, FALSE, TRUE); 7521 if (opt != NULL) 7522 func_desc_adjust (opt, info); 7523 opt_fd = elf_link_hash_lookup (&htab->elf, "__tls_get_addr_opt", 7524 FALSE, FALSE, TRUE); 7525 if (opt_fd != NULL 7526 && (opt_fd->root.type == bfd_link_hash_defined 7527 || opt_fd->root.type == bfd_link_hash_defweak)) 7528 { 7529 /* If glibc supports an optimized __tls_get_addr call stub, 7530 signalled by the presence of __tls_get_addr_opt, and we'll 7531 be calling __tls_get_addr via a plt call stub, then 7532 make __tls_get_addr point to __tls_get_addr_opt. */ 7533 tga_fd = &htab->tls_get_addr_fd->elf; 7534 if (htab->elf.dynamic_sections_created 7535 && tga_fd != NULL 7536 && (tga_fd->type == STT_FUNC 7537 || tga_fd->needs_plt) 7538 && !(SYMBOL_CALLS_LOCAL (info, tga_fd) 7539 || (ELF_ST_VISIBILITY (tga_fd->other) != STV_DEFAULT 7540 && tga_fd->root.type == bfd_link_hash_undefweak))) 7541 { 7542 struct plt_entry *ent; 7543 7544 for (ent = tga_fd->plt.plist; ent != NULL; ent = ent->next) 7545 if (ent->plt.refcount > 0) 7546 break; 7547 if (ent != NULL) 7548 { 7549 tga_fd->root.type = bfd_link_hash_indirect; 7550 tga_fd->root.u.i.link = &opt_fd->root; 7551 ppc64_elf_copy_indirect_symbol (info, opt_fd, tga_fd); 7552 if (opt_fd->dynindx != -1) 7553 { 7554 /* Use __tls_get_addr_opt in dynamic relocations. */ 7555 opt_fd->dynindx = -1; 7556 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 7557 opt_fd->dynstr_index); 7558 if (!bfd_elf_link_record_dynamic_symbol (info, opt_fd)) 7559 return NULL; 7560 } 7561 htab->tls_get_addr_fd = (struct ppc_link_hash_entry *) opt_fd; 7562 tga = &htab->tls_get_addr->elf; 7563 if (opt != NULL && tga != NULL) 7564 { 7565 tga->root.type = bfd_link_hash_indirect; 7566 tga->root.u.i.link = &opt->root; 7567 ppc64_elf_copy_indirect_symbol (info, opt, tga); 7568 _bfd_elf_link_hash_hide_symbol (info, opt, 7569 tga->forced_local); 7570 htab->tls_get_addr = (struct ppc_link_hash_entry *) opt; 7571 } 7572 htab->tls_get_addr_fd->oh = htab->tls_get_addr; 7573 htab->tls_get_addr_fd->is_func_descriptor = 1; 7574 if (htab->tls_get_addr != NULL) 7575 { 7576 htab->tls_get_addr->oh = htab->tls_get_addr_fd; 7577 htab->tls_get_addr->is_func = 1; 7578 } 7579 } 7580 } 7581 } 7582 else 7583 no_tls_get_addr_opt = TRUE; 7584 } 7585 htab->no_tls_get_addr_opt = no_tls_get_addr_opt; 7586 return _bfd_elf_tls_setup (info->output_bfd, info); 7587 } 7588 7589 /* Return TRUE iff REL is a branch reloc with a global symbol matching 7590 HASH1 or HASH2. */ 7591 7592 static bfd_boolean 7593 branch_reloc_hash_match (const bfd *ibfd, 7594 const Elf_Internal_Rela *rel, 7595 const struct ppc_link_hash_entry *hash1, 7596 const struct ppc_link_hash_entry *hash2) 7597 { 7598 Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (ibfd); 7599 enum elf_ppc64_reloc_type r_type = ELF64_R_TYPE (rel->r_info); 7600 unsigned int r_symndx = ELF64_R_SYM (rel->r_info); 7601 7602 if (r_symndx >= symtab_hdr->sh_info && is_branch_reloc (r_type)) 7603 { 7604 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd); 7605 struct elf_link_hash_entry *h; 7606 7607 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 7608 h = elf_follow_link (h); 7609 if (h == &hash1->elf || h == &hash2->elf) 7610 return TRUE; 7611 } 7612 return FALSE; 7613 } 7614 7615 /* Run through all the TLS relocs looking for optimization 7616 opportunities. The linker has been hacked (see ppc64elf.em) to do 7617 a preliminary section layout so that we know the TLS segment 7618 offsets. We can't optimize earlier because some optimizations need 7619 to know the tp offset, and we need to optimize before allocating 7620 dynamic relocations. */ 7621 7622 bfd_boolean 7623 ppc64_elf_tls_optimize (struct bfd_link_info *info) 7624 { 7625 bfd *ibfd; 7626 asection *sec; 7627 struct ppc_link_hash_table *htab; 7628 unsigned char *toc_ref; 7629 int pass; 7630 7631 if (info->relocatable || !info->executable) 7632 return TRUE; 7633 7634 htab = ppc_hash_table (info); 7635 if (htab == NULL) 7636 return FALSE; 7637 7638 /* Make two passes over the relocs. On the first pass, mark toc 7639 entries involved with tls relocs, and check that tls relocs 7640 involved in setting up a tls_get_addr call are indeed followed by 7641 such a call. If they are not, we can't do any tls optimization. 7642 On the second pass twiddle tls_mask flags to notify 7643 relocate_section that optimization can be done, and adjust got 7644 and plt refcounts. */ 7645 toc_ref = NULL; 7646 for (pass = 0; pass < 2; ++pass) 7647 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 7648 { 7649 Elf_Internal_Sym *locsyms = NULL; 7650 asection *toc = bfd_get_section_by_name (ibfd, ".toc"); 7651 7652 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 7653 if (sec->has_tls_reloc && !bfd_is_abs_section (sec->output_section)) 7654 { 7655 Elf_Internal_Rela *relstart, *rel, *relend; 7656 bfd_boolean found_tls_get_addr_arg = 0; 7657 7658 /* Read the relocations. */ 7659 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 7660 info->keep_memory); 7661 if (relstart == NULL) 7662 return FALSE; 7663 7664 relend = relstart + sec->reloc_count; 7665 for (rel = relstart; rel < relend; rel++) 7666 { 7667 enum elf_ppc64_reloc_type r_type; 7668 unsigned long r_symndx; 7669 struct elf_link_hash_entry *h; 7670 Elf_Internal_Sym *sym; 7671 asection *sym_sec; 7672 unsigned char *tls_mask; 7673 unsigned char tls_set, tls_clear, tls_type = 0; 7674 bfd_vma value; 7675 bfd_boolean ok_tprel, is_local; 7676 long toc_ref_index = 0; 7677 int expecting_tls_get_addr = 0; 7678 bfd_boolean ret = FALSE; 7679 7680 r_symndx = ELF64_R_SYM (rel->r_info); 7681 if (!get_sym_h (&h, &sym, &sym_sec, &tls_mask, &locsyms, 7682 r_symndx, ibfd)) 7683 { 7684 err_free_rel: 7685 if (elf_section_data (sec)->relocs != relstart) 7686 free (relstart); 7687 if (toc_ref != NULL) 7688 free (toc_ref); 7689 if (locsyms != NULL 7690 && (elf_symtab_hdr (ibfd).contents 7691 != (unsigned char *) locsyms)) 7692 free (locsyms); 7693 return ret; 7694 } 7695 7696 if (h != NULL) 7697 { 7698 if (h->root.type == bfd_link_hash_defined 7699 || h->root.type == bfd_link_hash_defweak) 7700 value = h->root.u.def.value; 7701 else if (h->root.type == bfd_link_hash_undefweak) 7702 value = 0; 7703 else 7704 { 7705 found_tls_get_addr_arg = 0; 7706 continue; 7707 } 7708 } 7709 else 7710 /* Symbols referenced by TLS relocs must be of type 7711 STT_TLS. So no need for .opd local sym adjust. */ 7712 value = sym->st_value; 7713 7714 ok_tprel = FALSE; 7715 is_local = FALSE; 7716 if (h == NULL 7717 || !h->def_dynamic) 7718 { 7719 is_local = TRUE; 7720 if (h != NULL 7721 && h->root.type == bfd_link_hash_undefweak) 7722 ok_tprel = TRUE; 7723 else 7724 { 7725 value += sym_sec->output_offset; 7726 value += sym_sec->output_section->vma; 7727 value -= htab->elf.tls_sec->vma; 7728 ok_tprel = (value + TP_OFFSET + ((bfd_vma) 1 << 31) 7729 < (bfd_vma) 1 << 32); 7730 } 7731 } 7732 7733 r_type = ELF64_R_TYPE (rel->r_info); 7734 /* If this section has old-style __tls_get_addr calls 7735 without marker relocs, then check that each 7736 __tls_get_addr call reloc is preceded by a reloc 7737 that conceivably belongs to the __tls_get_addr arg 7738 setup insn. If we don't find matching arg setup 7739 relocs, don't do any tls optimization. */ 7740 if (pass == 0 7741 && sec->has_tls_get_addr_call 7742 && h != NULL 7743 && (h == &htab->tls_get_addr->elf 7744 || h == &htab->tls_get_addr_fd->elf) 7745 && !found_tls_get_addr_arg 7746 && is_branch_reloc (r_type)) 7747 { 7748 info->callbacks->minfo (_("%H __tls_get_addr lost arg, " 7749 "TLS optimization disabled\n"), 7750 ibfd, sec, rel->r_offset); 7751 ret = TRUE; 7752 goto err_free_rel; 7753 } 7754 7755 found_tls_get_addr_arg = 0; 7756 switch (r_type) 7757 { 7758 case R_PPC64_GOT_TLSLD16: 7759 case R_PPC64_GOT_TLSLD16_LO: 7760 expecting_tls_get_addr = 1; 7761 found_tls_get_addr_arg = 1; 7762 /* Fall thru */ 7763 7764 case R_PPC64_GOT_TLSLD16_HI: 7765 case R_PPC64_GOT_TLSLD16_HA: 7766 /* These relocs should never be against a symbol 7767 defined in a shared lib. Leave them alone if 7768 that turns out to be the case. */ 7769 if (!is_local) 7770 continue; 7771 7772 /* LD -> LE */ 7773 tls_set = 0; 7774 tls_clear = TLS_LD; 7775 tls_type = TLS_TLS | TLS_LD; 7776 break; 7777 7778 case R_PPC64_GOT_TLSGD16: 7779 case R_PPC64_GOT_TLSGD16_LO: 7780 expecting_tls_get_addr = 1; 7781 found_tls_get_addr_arg = 1; 7782 /* Fall thru */ 7783 7784 case R_PPC64_GOT_TLSGD16_HI: 7785 case R_PPC64_GOT_TLSGD16_HA: 7786 if (ok_tprel) 7787 /* GD -> LE */ 7788 tls_set = 0; 7789 else 7790 /* GD -> IE */ 7791 tls_set = TLS_TLS | TLS_TPRELGD; 7792 tls_clear = TLS_GD; 7793 tls_type = TLS_TLS | TLS_GD; 7794 break; 7795 7796 case R_PPC64_GOT_TPREL16_DS: 7797 case R_PPC64_GOT_TPREL16_LO_DS: 7798 case R_PPC64_GOT_TPREL16_HI: 7799 case R_PPC64_GOT_TPREL16_HA: 7800 if (ok_tprel) 7801 { 7802 /* IE -> LE */ 7803 tls_set = 0; 7804 tls_clear = TLS_TPREL; 7805 tls_type = TLS_TLS | TLS_TPREL; 7806 break; 7807 } 7808 continue; 7809 7810 case R_PPC64_TLSGD: 7811 case R_PPC64_TLSLD: 7812 found_tls_get_addr_arg = 1; 7813 /* Fall thru */ 7814 7815 case R_PPC64_TLS: 7816 case R_PPC64_TOC16: 7817 case R_PPC64_TOC16_LO: 7818 if (sym_sec == NULL || sym_sec != toc) 7819 continue; 7820 7821 /* Mark this toc entry as referenced by a TLS 7822 code sequence. We can do that now in the 7823 case of R_PPC64_TLS, and after checking for 7824 tls_get_addr for the TOC16 relocs. */ 7825 if (toc_ref == NULL) 7826 toc_ref = bfd_zmalloc (toc->output_section->rawsize / 8); 7827 if (toc_ref == NULL) 7828 goto err_free_rel; 7829 7830 if (h != NULL) 7831 value = h->root.u.def.value; 7832 else 7833 value = sym->st_value; 7834 value += rel->r_addend; 7835 BFD_ASSERT (value < toc->size && value % 8 == 0); 7836 toc_ref_index = (value + toc->output_offset) / 8; 7837 if (r_type == R_PPC64_TLS 7838 || r_type == R_PPC64_TLSGD 7839 || r_type == R_PPC64_TLSLD) 7840 { 7841 toc_ref[toc_ref_index] = 1; 7842 continue; 7843 } 7844 7845 if (pass != 0 && toc_ref[toc_ref_index] == 0) 7846 continue; 7847 7848 tls_set = 0; 7849 tls_clear = 0; 7850 expecting_tls_get_addr = 2; 7851 break; 7852 7853 case R_PPC64_TPREL64: 7854 if (pass == 0 7855 || sec != toc 7856 || toc_ref == NULL 7857 || !toc_ref[(rel->r_offset + toc->output_offset) / 8]) 7858 continue; 7859 if (ok_tprel) 7860 { 7861 /* IE -> LE */ 7862 tls_set = TLS_EXPLICIT; 7863 tls_clear = TLS_TPREL; 7864 break; 7865 } 7866 continue; 7867 7868 case R_PPC64_DTPMOD64: 7869 if (pass == 0 7870 || sec != toc 7871 || toc_ref == NULL 7872 || !toc_ref[(rel->r_offset + toc->output_offset) / 8]) 7873 continue; 7874 if (rel + 1 < relend 7875 && (rel[1].r_info 7876 == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64)) 7877 && rel[1].r_offset == rel->r_offset + 8) 7878 { 7879 if (ok_tprel) 7880 /* GD -> LE */ 7881 tls_set = TLS_EXPLICIT | TLS_GD; 7882 else 7883 /* GD -> IE */ 7884 tls_set = TLS_EXPLICIT | TLS_GD | TLS_TPRELGD; 7885 tls_clear = TLS_GD; 7886 } 7887 else 7888 { 7889 if (!is_local) 7890 continue; 7891 7892 /* LD -> LE */ 7893 tls_set = TLS_EXPLICIT; 7894 tls_clear = TLS_LD; 7895 } 7896 break; 7897 7898 default: 7899 continue; 7900 } 7901 7902 if (pass == 0) 7903 { 7904 if (!expecting_tls_get_addr 7905 || !sec->has_tls_get_addr_call) 7906 continue; 7907 7908 if (rel + 1 < relend 7909 && branch_reloc_hash_match (ibfd, rel + 1, 7910 htab->tls_get_addr, 7911 htab->tls_get_addr_fd)) 7912 { 7913 if (expecting_tls_get_addr == 2) 7914 { 7915 /* Check for toc tls entries. */ 7916 unsigned char *toc_tls; 7917 int retval; 7918 7919 retval = get_tls_mask (&toc_tls, NULL, NULL, 7920 &locsyms, 7921 rel, ibfd); 7922 if (retval == 0) 7923 goto err_free_rel; 7924 if (toc_tls != NULL) 7925 { 7926 if ((*toc_tls & (TLS_GD | TLS_LD)) != 0) 7927 found_tls_get_addr_arg = 1; 7928 if (retval > 1) 7929 toc_ref[toc_ref_index] = 1; 7930 } 7931 } 7932 continue; 7933 } 7934 7935 if (expecting_tls_get_addr != 1) 7936 continue; 7937 7938 /* Uh oh, we didn't find the expected call. We 7939 could just mark this symbol to exclude it 7940 from tls optimization but it's safer to skip 7941 the entire optimization. */ 7942 info->callbacks->minfo (_("%H arg lost __tls_get_addr, " 7943 "TLS optimization disabled\n"), 7944 ibfd, sec, rel->r_offset); 7945 ret = TRUE; 7946 goto err_free_rel; 7947 } 7948 7949 if (expecting_tls_get_addr && htab->tls_get_addr != NULL) 7950 { 7951 struct plt_entry *ent; 7952 for (ent = htab->tls_get_addr->elf.plt.plist; 7953 ent != NULL; 7954 ent = ent->next) 7955 if (ent->addend == 0) 7956 { 7957 if (ent->plt.refcount > 0) 7958 { 7959 ent->plt.refcount -= 1; 7960 expecting_tls_get_addr = 0; 7961 } 7962 break; 7963 } 7964 } 7965 7966 if (expecting_tls_get_addr && htab->tls_get_addr_fd != NULL) 7967 { 7968 struct plt_entry *ent; 7969 for (ent = htab->tls_get_addr_fd->elf.plt.plist; 7970 ent != NULL; 7971 ent = ent->next) 7972 if (ent->addend == 0) 7973 { 7974 if (ent->plt.refcount > 0) 7975 ent->plt.refcount -= 1; 7976 break; 7977 } 7978 } 7979 7980 if (tls_clear == 0) 7981 continue; 7982 7983 if ((tls_set & TLS_EXPLICIT) == 0) 7984 { 7985 struct got_entry *ent; 7986 7987 /* Adjust got entry for this reloc. */ 7988 if (h != NULL) 7989 ent = h->got.glist; 7990 else 7991 ent = elf_local_got_ents (ibfd)[r_symndx]; 7992 7993 for (; ent != NULL; ent = ent->next) 7994 if (ent->addend == rel->r_addend 7995 && ent->owner == ibfd 7996 && ent->tls_type == tls_type) 7997 break; 7998 if (ent == NULL) 7999 abort (); 8000 8001 if (tls_set == 0) 8002 { 8003 /* We managed to get rid of a got entry. */ 8004 if (ent->got.refcount > 0) 8005 ent->got.refcount -= 1; 8006 } 8007 } 8008 else 8009 { 8010 /* If we got rid of a DTPMOD/DTPREL reloc pair then 8011 we'll lose one or two dyn relocs. */ 8012 if (!dec_dynrel_count (rel->r_info, sec, info, 8013 NULL, h, sym_sec)) 8014 return FALSE; 8015 8016 if (tls_set == (TLS_EXPLICIT | TLS_GD)) 8017 { 8018 if (!dec_dynrel_count ((rel + 1)->r_info, sec, info, 8019 NULL, h, sym_sec)) 8020 return FALSE; 8021 } 8022 } 8023 8024 *tls_mask |= tls_set; 8025 *tls_mask &= ~tls_clear; 8026 } 8027 8028 if (elf_section_data (sec)->relocs != relstart) 8029 free (relstart); 8030 } 8031 8032 if (locsyms != NULL 8033 && (elf_symtab_hdr (ibfd).contents != (unsigned char *) locsyms)) 8034 { 8035 if (!info->keep_memory) 8036 free (locsyms); 8037 else 8038 elf_symtab_hdr (ibfd).contents = (unsigned char *) locsyms; 8039 } 8040 } 8041 8042 if (toc_ref != NULL) 8043 free (toc_ref); 8044 return TRUE; 8045 } 8046 8047 /* Called via elf_link_hash_traverse from ppc64_elf_edit_toc to adjust 8048 the values of any global symbols in a toc section that has been 8049 edited. Globals in toc sections should be a rarity, so this function 8050 sets a flag if any are found in toc sections other than the one just 8051 edited, so that futher hash table traversals can be avoided. */ 8052 8053 struct adjust_toc_info 8054 { 8055 asection *toc; 8056 unsigned long *skip; 8057 bfd_boolean global_toc_syms; 8058 }; 8059 8060 enum toc_skip_enum { ref_from_discarded = 1, can_optimize = 2 }; 8061 8062 static bfd_boolean 8063 adjust_toc_syms (struct elf_link_hash_entry *h, void *inf) 8064 { 8065 struct ppc_link_hash_entry *eh; 8066 struct adjust_toc_info *toc_inf = (struct adjust_toc_info *) inf; 8067 unsigned long i; 8068 8069 if (h->root.type != bfd_link_hash_defined 8070 && h->root.type != bfd_link_hash_defweak) 8071 return TRUE; 8072 8073 eh = (struct ppc_link_hash_entry *) h; 8074 if (eh->adjust_done) 8075 return TRUE; 8076 8077 if (eh->elf.root.u.def.section == toc_inf->toc) 8078 { 8079 if (eh->elf.root.u.def.value > toc_inf->toc->rawsize) 8080 i = toc_inf->toc->rawsize >> 3; 8081 else 8082 i = eh->elf.root.u.def.value >> 3; 8083 8084 if ((toc_inf->skip[i] & (ref_from_discarded | can_optimize)) != 0) 8085 { 8086 (*_bfd_error_handler) 8087 (_("%s defined on removed toc entry"), eh->elf.root.root.string); 8088 do 8089 ++i; 8090 while ((toc_inf->skip[i] & (ref_from_discarded | can_optimize)) != 0); 8091 eh->elf.root.u.def.value = (bfd_vma) i << 3; 8092 } 8093 8094 eh->elf.root.u.def.value -= toc_inf->skip[i]; 8095 eh->adjust_done = 1; 8096 } 8097 else if (strcmp (eh->elf.root.u.def.section->name, ".toc") == 0) 8098 toc_inf->global_toc_syms = TRUE; 8099 8100 return TRUE; 8101 } 8102 8103 /* Return TRUE iff INSN is one we expect on a _LO variety toc/got reloc. */ 8104 8105 static bfd_boolean 8106 ok_lo_toc_insn (unsigned int insn) 8107 { 8108 return ((insn & (0x3f << 26)) == 14u << 26 /* addi */ 8109 || (insn & (0x3f << 26)) == 32u << 26 /* lwz */ 8110 || (insn & (0x3f << 26)) == 34u << 26 /* lbz */ 8111 || (insn & (0x3f << 26)) == 36u << 26 /* stw */ 8112 || (insn & (0x3f << 26)) == 38u << 26 /* stb */ 8113 || (insn & (0x3f << 26)) == 40u << 26 /* lhz */ 8114 || (insn & (0x3f << 26)) == 42u << 26 /* lha */ 8115 || (insn & (0x3f << 26)) == 44u << 26 /* sth */ 8116 || (insn & (0x3f << 26)) == 46u << 26 /* lmw */ 8117 || (insn & (0x3f << 26)) == 47u << 26 /* stmw */ 8118 || (insn & (0x3f << 26)) == 48u << 26 /* lfs */ 8119 || (insn & (0x3f << 26)) == 50u << 26 /* lfd */ 8120 || (insn & (0x3f << 26)) == 52u << 26 /* stfs */ 8121 || (insn & (0x3f << 26)) == 54u << 26 /* stfd */ 8122 || ((insn & (0x3f << 26)) == 58u << 26 /* lwa,ld,lmd */ 8123 && (insn & 3) != 1) 8124 || ((insn & (0x3f << 26)) == 62u << 26 /* std, stmd */ 8125 && ((insn & 3) == 0 || (insn & 3) == 3)) 8126 || (insn & (0x3f << 26)) == 12u << 26 /* addic */); 8127 } 8128 8129 /* Examine all relocs referencing .toc sections in order to remove 8130 unused .toc entries. */ 8131 8132 bfd_boolean 8133 ppc64_elf_edit_toc (struct bfd_link_info *info) 8134 { 8135 bfd *ibfd; 8136 struct adjust_toc_info toc_inf; 8137 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8138 8139 htab->do_toc_opt = 1; 8140 toc_inf.global_toc_syms = TRUE; 8141 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 8142 { 8143 asection *toc, *sec; 8144 Elf_Internal_Shdr *symtab_hdr; 8145 Elf_Internal_Sym *local_syms; 8146 Elf_Internal_Rela *relstart, *rel, *toc_relocs; 8147 unsigned long *skip, *drop; 8148 unsigned char *used; 8149 unsigned char *keep, last, some_unused; 8150 8151 if (!is_ppc64_elf (ibfd)) 8152 continue; 8153 8154 toc = bfd_get_section_by_name (ibfd, ".toc"); 8155 if (toc == NULL 8156 || toc->size == 0 8157 || toc->sec_info_type == SEC_INFO_TYPE_JUST_SYMS 8158 || discarded_section (toc)) 8159 continue; 8160 8161 toc_relocs = NULL; 8162 local_syms = NULL; 8163 symtab_hdr = &elf_symtab_hdr (ibfd); 8164 8165 /* Look at sections dropped from the final link. */ 8166 skip = NULL; 8167 relstart = NULL; 8168 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 8169 { 8170 if (sec->reloc_count == 0 8171 || !discarded_section (sec) 8172 || get_opd_info (sec) 8173 || (sec->flags & SEC_ALLOC) == 0 8174 || (sec->flags & SEC_DEBUGGING) != 0) 8175 continue; 8176 8177 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, FALSE); 8178 if (relstart == NULL) 8179 goto error_ret; 8180 8181 /* Run through the relocs to see which toc entries might be 8182 unused. */ 8183 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 8184 { 8185 enum elf_ppc64_reloc_type r_type; 8186 unsigned long r_symndx; 8187 asection *sym_sec; 8188 struct elf_link_hash_entry *h; 8189 Elf_Internal_Sym *sym; 8190 bfd_vma val; 8191 8192 r_type = ELF64_R_TYPE (rel->r_info); 8193 switch (r_type) 8194 { 8195 default: 8196 continue; 8197 8198 case R_PPC64_TOC16: 8199 case R_PPC64_TOC16_LO: 8200 case R_PPC64_TOC16_HI: 8201 case R_PPC64_TOC16_HA: 8202 case R_PPC64_TOC16_DS: 8203 case R_PPC64_TOC16_LO_DS: 8204 break; 8205 } 8206 8207 r_symndx = ELF64_R_SYM (rel->r_info); 8208 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 8209 r_symndx, ibfd)) 8210 goto error_ret; 8211 8212 if (sym_sec != toc) 8213 continue; 8214 8215 if (h != NULL) 8216 val = h->root.u.def.value; 8217 else 8218 val = sym->st_value; 8219 val += rel->r_addend; 8220 8221 if (val >= toc->size) 8222 continue; 8223 8224 /* Anything in the toc ought to be aligned to 8 bytes. 8225 If not, don't mark as unused. */ 8226 if (val & 7) 8227 continue; 8228 8229 if (skip == NULL) 8230 { 8231 skip = bfd_zmalloc (sizeof (*skip) * (toc->size + 15) / 8); 8232 if (skip == NULL) 8233 goto error_ret; 8234 } 8235 8236 skip[val >> 3] = ref_from_discarded; 8237 } 8238 8239 if (elf_section_data (sec)->relocs != relstart) 8240 free (relstart); 8241 } 8242 8243 /* For largetoc loads of address constants, we can convert 8244 . addis rx,2,addr@got@ha 8245 . ld ry,addr@got@l(rx) 8246 to 8247 . addis rx,2,addr@toc@ha 8248 . addi ry,rx,addr@toc@l 8249 when addr is within 2G of the toc pointer. This then means 8250 that the word storing "addr" in the toc is no longer needed. */ 8251 8252 if (!ppc64_elf_tdata (ibfd)->has_small_toc_reloc 8253 && toc->output_section->rawsize < (bfd_vma) 1 << 31 8254 && toc->reloc_count != 0) 8255 { 8256 /* Read toc relocs. */ 8257 toc_relocs = _bfd_elf_link_read_relocs (ibfd, toc, NULL, NULL, 8258 info->keep_memory); 8259 if (toc_relocs == NULL) 8260 goto error_ret; 8261 8262 for (rel = toc_relocs; rel < toc_relocs + toc->reloc_count; ++rel) 8263 { 8264 enum elf_ppc64_reloc_type r_type; 8265 unsigned long r_symndx; 8266 asection *sym_sec; 8267 struct elf_link_hash_entry *h; 8268 Elf_Internal_Sym *sym; 8269 bfd_vma val, addr; 8270 8271 r_type = ELF64_R_TYPE (rel->r_info); 8272 if (r_type != R_PPC64_ADDR64) 8273 continue; 8274 8275 r_symndx = ELF64_R_SYM (rel->r_info); 8276 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 8277 r_symndx, ibfd)) 8278 goto error_ret; 8279 8280 if (sym_sec == NULL 8281 || discarded_section (sym_sec)) 8282 continue; 8283 8284 if (!SYMBOL_CALLS_LOCAL (info, h)) 8285 continue; 8286 8287 if (h != NULL) 8288 { 8289 if (h->type == STT_GNU_IFUNC) 8290 continue; 8291 val = h->root.u.def.value; 8292 } 8293 else 8294 { 8295 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 8296 continue; 8297 val = sym->st_value; 8298 } 8299 val += rel->r_addend; 8300 val += sym_sec->output_section->vma + sym_sec->output_offset; 8301 8302 /* We don't yet know the exact toc pointer value, but we 8303 know it will be somewhere in the toc section. Don't 8304 optimize if the difference from any possible toc 8305 pointer is outside [ff..f80008000, 7fff7fff]. */ 8306 addr = toc->output_section->vma + TOC_BASE_OFF; 8307 if (val - addr + (bfd_vma) 0x80008000 >= (bfd_vma) 1 << 32) 8308 continue; 8309 8310 addr = toc->output_section->vma + toc->output_section->rawsize; 8311 if (val - addr + (bfd_vma) 0x80008000 >= (bfd_vma) 1 << 32) 8312 continue; 8313 8314 if (skip == NULL) 8315 { 8316 skip = bfd_zmalloc (sizeof (*skip) * (toc->size + 15) / 8); 8317 if (skip == NULL) 8318 goto error_ret; 8319 } 8320 8321 skip[rel->r_offset >> 3] 8322 |= can_optimize | ((rel - toc_relocs) << 2); 8323 } 8324 } 8325 8326 if (skip == NULL) 8327 continue; 8328 8329 used = bfd_zmalloc (sizeof (*used) * (toc->size + 7) / 8); 8330 if (used == NULL) 8331 { 8332 error_ret: 8333 if (local_syms != NULL 8334 && symtab_hdr->contents != (unsigned char *) local_syms) 8335 free (local_syms); 8336 if (sec != NULL 8337 && relstart != NULL 8338 && elf_section_data (sec)->relocs != relstart) 8339 free (relstart); 8340 if (toc_relocs != NULL 8341 && elf_section_data (toc)->relocs != toc_relocs) 8342 free (toc_relocs); 8343 if (skip != NULL) 8344 free (skip); 8345 return FALSE; 8346 } 8347 8348 /* Now check all kept sections that might reference the toc. 8349 Check the toc itself last. */ 8350 for (sec = (ibfd->sections == toc && toc->next ? toc->next 8351 : ibfd->sections); 8352 sec != NULL; 8353 sec = (sec == toc ? NULL 8354 : sec->next == NULL ? toc 8355 : sec->next == toc && toc->next ? toc->next 8356 : sec->next)) 8357 { 8358 int repeat; 8359 8360 if (sec->reloc_count == 0 8361 || discarded_section (sec) 8362 || get_opd_info (sec) 8363 || (sec->flags & SEC_ALLOC) == 0 8364 || (sec->flags & SEC_DEBUGGING) != 0) 8365 continue; 8366 8367 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 8368 info->keep_memory); 8369 if (relstart == NULL) 8370 goto error_ret; 8371 8372 /* Mark toc entries referenced as used. */ 8373 do 8374 { 8375 repeat = 0; 8376 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 8377 { 8378 enum elf_ppc64_reloc_type r_type; 8379 unsigned long r_symndx; 8380 asection *sym_sec; 8381 struct elf_link_hash_entry *h; 8382 Elf_Internal_Sym *sym; 8383 bfd_vma val; 8384 enum {no_check, check_lo, check_ha} insn_check; 8385 8386 r_type = ELF64_R_TYPE (rel->r_info); 8387 switch (r_type) 8388 { 8389 default: 8390 insn_check = no_check; 8391 break; 8392 8393 case R_PPC64_GOT_TLSLD16_HA: 8394 case R_PPC64_GOT_TLSGD16_HA: 8395 case R_PPC64_GOT_TPREL16_HA: 8396 case R_PPC64_GOT_DTPREL16_HA: 8397 case R_PPC64_GOT16_HA: 8398 case R_PPC64_TOC16_HA: 8399 insn_check = check_ha; 8400 break; 8401 8402 case R_PPC64_GOT_TLSLD16_LO: 8403 case R_PPC64_GOT_TLSGD16_LO: 8404 case R_PPC64_GOT_TPREL16_LO_DS: 8405 case R_PPC64_GOT_DTPREL16_LO_DS: 8406 case R_PPC64_GOT16_LO: 8407 case R_PPC64_GOT16_LO_DS: 8408 case R_PPC64_TOC16_LO: 8409 case R_PPC64_TOC16_LO_DS: 8410 insn_check = check_lo; 8411 break; 8412 } 8413 8414 if (insn_check != no_check) 8415 { 8416 bfd_vma off = rel->r_offset & ~3; 8417 unsigned char buf[4]; 8418 unsigned int insn; 8419 8420 if (!bfd_get_section_contents (ibfd, sec, buf, off, 4)) 8421 { 8422 free (used); 8423 goto error_ret; 8424 } 8425 insn = bfd_get_32 (ibfd, buf); 8426 if (insn_check == check_lo 8427 ? !ok_lo_toc_insn (insn) 8428 : ((insn & ((0x3f << 26) | 0x1f << 16)) 8429 != ((15u << 26) | (2 << 16)) /* addis rt,2,imm */)) 8430 { 8431 char str[12]; 8432 8433 ppc64_elf_tdata (ibfd)->unexpected_toc_insn = 1; 8434 sprintf (str, "%#08x", insn); 8435 info->callbacks->einfo 8436 (_("%P: %H: toc optimization is not supported for" 8437 " %s instruction.\n"), 8438 ibfd, sec, rel->r_offset & ~3, str); 8439 } 8440 } 8441 8442 switch (r_type) 8443 { 8444 case R_PPC64_TOC16: 8445 case R_PPC64_TOC16_LO: 8446 case R_PPC64_TOC16_HI: 8447 case R_PPC64_TOC16_HA: 8448 case R_PPC64_TOC16_DS: 8449 case R_PPC64_TOC16_LO_DS: 8450 /* In case we're taking addresses of toc entries. */ 8451 case R_PPC64_ADDR64: 8452 break; 8453 8454 default: 8455 continue; 8456 } 8457 8458 r_symndx = ELF64_R_SYM (rel->r_info); 8459 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 8460 r_symndx, ibfd)) 8461 { 8462 free (used); 8463 goto error_ret; 8464 } 8465 8466 if (sym_sec != toc) 8467 continue; 8468 8469 if (h != NULL) 8470 val = h->root.u.def.value; 8471 else 8472 val = sym->st_value; 8473 val += rel->r_addend; 8474 8475 if (val >= toc->size) 8476 continue; 8477 8478 if ((skip[val >> 3] & can_optimize) != 0) 8479 { 8480 bfd_vma off; 8481 unsigned char opc; 8482 8483 switch (r_type) 8484 { 8485 case R_PPC64_TOC16_HA: 8486 break; 8487 8488 case R_PPC64_TOC16_LO_DS: 8489 off = rel->r_offset; 8490 off += (bfd_big_endian (ibfd) ? -2 : 3); 8491 if (!bfd_get_section_contents (ibfd, sec, &opc, 8492 off, 1)) 8493 { 8494 free (used); 8495 goto error_ret; 8496 } 8497 if ((opc & (0x3f << 2)) == (58u << 2)) 8498 break; 8499 /* Fall thru */ 8500 8501 default: 8502 /* Wrong sort of reloc, or not a ld. We may 8503 as well clear ref_from_discarded too. */ 8504 skip[val >> 3] = 0; 8505 } 8506 } 8507 8508 if (sec != toc) 8509 used[val >> 3] = 1; 8510 /* For the toc section, we only mark as used if this 8511 entry itself isn't unused. */ 8512 else if ((used[rel->r_offset >> 3] 8513 || !(skip[rel->r_offset >> 3] & ref_from_discarded)) 8514 && !used[val >> 3]) 8515 { 8516 /* Do all the relocs again, to catch reference 8517 chains. */ 8518 repeat = 1; 8519 used[val >> 3] = 1; 8520 } 8521 } 8522 } 8523 while (repeat); 8524 8525 if (elf_section_data (sec)->relocs != relstart) 8526 free (relstart); 8527 } 8528 8529 /* Merge the used and skip arrays. Assume that TOC 8530 doublewords not appearing as either used or unused belong 8531 to to an entry more than one doubleword in size. */ 8532 for (drop = skip, keep = used, last = 0, some_unused = 0; 8533 drop < skip + (toc->size + 7) / 8; 8534 ++drop, ++keep) 8535 { 8536 if (*keep) 8537 { 8538 *drop &= ~ref_from_discarded; 8539 if ((*drop & can_optimize) != 0) 8540 some_unused = 1; 8541 last = 0; 8542 } 8543 else if ((*drop & ref_from_discarded) != 0) 8544 { 8545 some_unused = 1; 8546 last = ref_from_discarded; 8547 } 8548 else 8549 *drop = last; 8550 } 8551 8552 free (used); 8553 8554 if (some_unused) 8555 { 8556 bfd_byte *contents, *src; 8557 unsigned long off; 8558 Elf_Internal_Sym *sym; 8559 bfd_boolean local_toc_syms = FALSE; 8560 8561 /* Shuffle the toc contents, and at the same time convert the 8562 skip array from booleans into offsets. */ 8563 if (!bfd_malloc_and_get_section (ibfd, toc, &contents)) 8564 goto error_ret; 8565 8566 elf_section_data (toc)->this_hdr.contents = contents; 8567 8568 for (src = contents, off = 0, drop = skip; 8569 src < contents + toc->size; 8570 src += 8, ++drop) 8571 { 8572 if ((*drop & (can_optimize | ref_from_discarded)) != 0) 8573 off += 8; 8574 else if (off != 0) 8575 { 8576 *drop = off; 8577 memcpy (src - off, src, 8); 8578 } 8579 } 8580 *drop = off; 8581 toc->rawsize = toc->size; 8582 toc->size = src - contents - off; 8583 8584 /* Adjust addends for relocs against the toc section sym, 8585 and optimize any accesses we can. */ 8586 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 8587 { 8588 if (sec->reloc_count == 0 8589 || discarded_section (sec)) 8590 continue; 8591 8592 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 8593 info->keep_memory); 8594 if (relstart == NULL) 8595 goto error_ret; 8596 8597 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 8598 { 8599 enum elf_ppc64_reloc_type r_type; 8600 unsigned long r_symndx; 8601 asection *sym_sec; 8602 struct elf_link_hash_entry *h; 8603 bfd_vma val; 8604 8605 r_type = ELF64_R_TYPE (rel->r_info); 8606 switch (r_type) 8607 { 8608 default: 8609 continue; 8610 8611 case R_PPC64_TOC16: 8612 case R_PPC64_TOC16_LO: 8613 case R_PPC64_TOC16_HI: 8614 case R_PPC64_TOC16_HA: 8615 case R_PPC64_TOC16_DS: 8616 case R_PPC64_TOC16_LO_DS: 8617 case R_PPC64_ADDR64: 8618 break; 8619 } 8620 8621 r_symndx = ELF64_R_SYM (rel->r_info); 8622 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 8623 r_symndx, ibfd)) 8624 goto error_ret; 8625 8626 if (sym_sec != toc) 8627 continue; 8628 8629 if (h != NULL) 8630 val = h->root.u.def.value; 8631 else 8632 { 8633 val = sym->st_value; 8634 if (val != 0) 8635 local_toc_syms = TRUE; 8636 } 8637 8638 val += rel->r_addend; 8639 8640 if (val > toc->rawsize) 8641 val = toc->rawsize; 8642 else if ((skip[val >> 3] & ref_from_discarded) != 0) 8643 continue; 8644 else if ((skip[val >> 3] & can_optimize) != 0) 8645 { 8646 Elf_Internal_Rela *tocrel 8647 = toc_relocs + (skip[val >> 3] >> 2); 8648 unsigned long tsym = ELF64_R_SYM (tocrel->r_info); 8649 8650 switch (r_type) 8651 { 8652 case R_PPC64_TOC16_HA: 8653 rel->r_info = ELF64_R_INFO (tsym, R_PPC64_TOC16_HA); 8654 break; 8655 8656 case R_PPC64_TOC16_LO_DS: 8657 rel->r_info = ELF64_R_INFO (tsym, R_PPC64_LO_DS_OPT); 8658 break; 8659 8660 default: 8661 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 8662 ppc_howto_init (); 8663 info->callbacks->einfo 8664 (_("%P: %H: %s references " 8665 "optimized away TOC entry\n"), 8666 ibfd, sec, rel->r_offset, 8667 ppc64_elf_howto_table[r_type]->name); 8668 bfd_set_error (bfd_error_bad_value); 8669 goto error_ret; 8670 } 8671 rel->r_addend = tocrel->r_addend; 8672 elf_section_data (sec)->relocs = relstart; 8673 continue; 8674 } 8675 8676 if (h != NULL || sym->st_value != 0) 8677 continue; 8678 8679 rel->r_addend -= skip[val >> 3]; 8680 elf_section_data (sec)->relocs = relstart; 8681 } 8682 8683 if (elf_section_data (sec)->relocs != relstart) 8684 free (relstart); 8685 } 8686 8687 /* We shouldn't have local or global symbols defined in the TOC, 8688 but handle them anyway. */ 8689 if (local_syms != NULL) 8690 for (sym = local_syms; 8691 sym < local_syms + symtab_hdr->sh_info; 8692 ++sym) 8693 if (sym->st_value != 0 8694 && bfd_section_from_elf_index (ibfd, sym->st_shndx) == toc) 8695 { 8696 unsigned long i; 8697 8698 if (sym->st_value > toc->rawsize) 8699 i = toc->rawsize >> 3; 8700 else 8701 i = sym->st_value >> 3; 8702 8703 if ((skip[i] & (ref_from_discarded | can_optimize)) != 0) 8704 { 8705 if (local_toc_syms) 8706 (*_bfd_error_handler) 8707 (_("%s defined on removed toc entry"), 8708 bfd_elf_sym_name (ibfd, symtab_hdr, sym, NULL)); 8709 do 8710 ++i; 8711 while ((skip[i] & (ref_from_discarded | can_optimize))); 8712 sym->st_value = (bfd_vma) i << 3; 8713 } 8714 8715 sym->st_value -= skip[i]; 8716 symtab_hdr->contents = (unsigned char *) local_syms; 8717 } 8718 8719 /* Adjust any global syms defined in this toc input section. */ 8720 if (toc_inf.global_toc_syms) 8721 { 8722 toc_inf.toc = toc; 8723 toc_inf.skip = skip; 8724 toc_inf.global_toc_syms = FALSE; 8725 elf_link_hash_traverse (elf_hash_table (info), adjust_toc_syms, 8726 &toc_inf); 8727 } 8728 8729 if (toc->reloc_count != 0) 8730 { 8731 Elf_Internal_Shdr *rel_hdr; 8732 Elf_Internal_Rela *wrel; 8733 bfd_size_type sz; 8734 8735 /* Remove unused toc relocs, and adjust those we keep. */ 8736 if (toc_relocs == NULL) 8737 toc_relocs = _bfd_elf_link_read_relocs (ibfd, toc, NULL, NULL, 8738 info->keep_memory); 8739 if (toc_relocs == NULL) 8740 goto error_ret; 8741 8742 wrel = toc_relocs; 8743 for (rel = toc_relocs; rel < toc_relocs + toc->reloc_count; ++rel) 8744 if ((skip[rel->r_offset >> 3] 8745 & (ref_from_discarded | can_optimize)) == 0) 8746 { 8747 wrel->r_offset = rel->r_offset - skip[rel->r_offset >> 3]; 8748 wrel->r_info = rel->r_info; 8749 wrel->r_addend = rel->r_addend; 8750 ++wrel; 8751 } 8752 else if (!dec_dynrel_count (rel->r_info, toc, info, 8753 &local_syms, NULL, NULL)) 8754 goto error_ret; 8755 8756 elf_section_data (toc)->relocs = toc_relocs; 8757 toc->reloc_count = wrel - toc_relocs; 8758 rel_hdr = _bfd_elf_single_rel_hdr (toc); 8759 sz = rel_hdr->sh_entsize; 8760 rel_hdr->sh_size = toc->reloc_count * sz; 8761 } 8762 } 8763 else if (toc_relocs != NULL 8764 && elf_section_data (toc)->relocs != toc_relocs) 8765 free (toc_relocs); 8766 8767 if (local_syms != NULL 8768 && symtab_hdr->contents != (unsigned char *) local_syms) 8769 { 8770 if (!info->keep_memory) 8771 free (local_syms); 8772 else 8773 symtab_hdr->contents = (unsigned char *) local_syms; 8774 } 8775 free (skip); 8776 } 8777 8778 return TRUE; 8779 } 8780 8781 /* Return true iff input section I references the TOC using 8782 instructions limited to +/-32k offsets. */ 8783 8784 bfd_boolean 8785 ppc64_elf_has_small_toc_reloc (asection *i) 8786 { 8787 return (is_ppc64_elf (i->owner) 8788 && ppc64_elf_tdata (i->owner)->has_small_toc_reloc); 8789 } 8790 8791 /* Allocate space for one GOT entry. */ 8792 8793 static void 8794 allocate_got (struct elf_link_hash_entry *h, 8795 struct bfd_link_info *info, 8796 struct got_entry *gent) 8797 { 8798 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8799 bfd_boolean dyn; 8800 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h; 8801 int entsize = (gent->tls_type & eh->tls_mask & (TLS_GD | TLS_LD) 8802 ? 16 : 8); 8803 int rentsize = (gent->tls_type & eh->tls_mask & TLS_GD 8804 ? 2 : 1) * sizeof (Elf64_External_Rela); 8805 asection *got = ppc64_elf_tdata (gent->owner)->got; 8806 8807 gent->got.offset = got->size; 8808 got->size += entsize; 8809 8810 dyn = htab->elf.dynamic_sections_created; 8811 if ((info->shared 8812 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)) 8813 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 8814 || h->root.type != bfd_link_hash_undefweak)) 8815 { 8816 asection *relgot = ppc64_elf_tdata (gent->owner)->relgot; 8817 relgot->size += rentsize; 8818 } 8819 else if (h->type == STT_GNU_IFUNC) 8820 { 8821 asection *relgot = htab->reliplt; 8822 relgot->size += rentsize; 8823 htab->got_reli_size += rentsize; 8824 } 8825 } 8826 8827 /* This function merges got entries in the same toc group. */ 8828 8829 static void 8830 merge_got_entries (struct got_entry **pent) 8831 { 8832 struct got_entry *ent, *ent2; 8833 8834 for (ent = *pent; ent != NULL; ent = ent->next) 8835 if (!ent->is_indirect) 8836 for (ent2 = ent->next; ent2 != NULL; ent2 = ent2->next) 8837 if (!ent2->is_indirect 8838 && ent2->addend == ent->addend 8839 && ent2->tls_type == ent->tls_type 8840 && elf_gp (ent2->owner) == elf_gp (ent->owner)) 8841 { 8842 ent2->is_indirect = TRUE; 8843 ent2->got.ent = ent; 8844 } 8845 } 8846 8847 /* Allocate space in .plt, .got and associated reloc sections for 8848 dynamic relocs. */ 8849 8850 static bfd_boolean 8851 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 8852 { 8853 struct bfd_link_info *info; 8854 struct ppc_link_hash_table *htab; 8855 asection *s; 8856 struct ppc_link_hash_entry *eh; 8857 struct elf_dyn_relocs *p; 8858 struct got_entry **pgent, *gent; 8859 8860 if (h->root.type == bfd_link_hash_indirect) 8861 return TRUE; 8862 8863 info = (struct bfd_link_info *) inf; 8864 htab = ppc_hash_table (info); 8865 if (htab == NULL) 8866 return FALSE; 8867 8868 if ((htab->elf.dynamic_sections_created 8869 && h->dynindx != -1 8870 && WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h)) 8871 || h->type == STT_GNU_IFUNC) 8872 { 8873 struct plt_entry *pent; 8874 bfd_boolean doneone = FALSE; 8875 for (pent = h->plt.plist; pent != NULL; pent = pent->next) 8876 if (pent->plt.refcount > 0) 8877 { 8878 if (!htab->elf.dynamic_sections_created 8879 || h->dynindx == -1) 8880 { 8881 s = htab->iplt; 8882 pent->plt.offset = s->size; 8883 s->size += PLT_ENTRY_SIZE; 8884 s = htab->reliplt; 8885 } 8886 else 8887 { 8888 /* If this is the first .plt entry, make room for the special 8889 first entry. */ 8890 s = htab->plt; 8891 if (s->size == 0) 8892 s->size += PLT_INITIAL_ENTRY_SIZE; 8893 8894 pent->plt.offset = s->size; 8895 8896 /* Make room for this entry. */ 8897 s->size += PLT_ENTRY_SIZE; 8898 8899 /* Make room for the .glink code. */ 8900 s = htab->glink; 8901 if (s->size == 0) 8902 s->size += GLINK_CALL_STUB_SIZE; 8903 /* We need bigger stubs past index 32767. */ 8904 if (s->size >= GLINK_CALL_STUB_SIZE + 32768*2*4) 8905 s->size += 4; 8906 s->size += 2*4; 8907 8908 /* We also need to make an entry in the .rela.plt section. */ 8909 s = htab->relplt; 8910 } 8911 s->size += sizeof (Elf64_External_Rela); 8912 doneone = TRUE; 8913 } 8914 else 8915 pent->plt.offset = (bfd_vma) -1; 8916 if (!doneone) 8917 { 8918 h->plt.plist = NULL; 8919 h->needs_plt = 0; 8920 } 8921 } 8922 else 8923 { 8924 h->plt.plist = NULL; 8925 h->needs_plt = 0; 8926 } 8927 8928 eh = (struct ppc_link_hash_entry *) h; 8929 /* Run through the TLS GD got entries first if we're changing them 8930 to TPREL. */ 8931 if ((eh->tls_mask & TLS_TPRELGD) != 0) 8932 for (gent = h->got.glist; gent != NULL; gent = gent->next) 8933 if (gent->got.refcount > 0 8934 && (gent->tls_type & TLS_GD) != 0) 8935 { 8936 /* This was a GD entry that has been converted to TPREL. If 8937 there happens to be a TPREL entry we can use that one. */ 8938 struct got_entry *ent; 8939 for (ent = h->got.glist; ent != NULL; ent = ent->next) 8940 if (ent->got.refcount > 0 8941 && (ent->tls_type & TLS_TPREL) != 0 8942 && ent->addend == gent->addend 8943 && ent->owner == gent->owner) 8944 { 8945 gent->got.refcount = 0; 8946 break; 8947 } 8948 8949 /* If not, then we'll be using our own TPREL entry. */ 8950 if (gent->got.refcount != 0) 8951 gent->tls_type = TLS_TLS | TLS_TPREL; 8952 } 8953 8954 /* Remove any list entry that won't generate a word in the GOT before 8955 we call merge_got_entries. Otherwise we risk merging to empty 8956 entries. */ 8957 pgent = &h->got.glist; 8958 while ((gent = *pgent) != NULL) 8959 if (gent->got.refcount > 0) 8960 { 8961 if ((gent->tls_type & TLS_LD) != 0 8962 && !h->def_dynamic) 8963 { 8964 ppc64_tlsld_got (gent->owner)->got.refcount += 1; 8965 *pgent = gent->next; 8966 } 8967 else 8968 pgent = &gent->next; 8969 } 8970 else 8971 *pgent = gent->next; 8972 8973 if (!htab->do_multi_toc) 8974 merge_got_entries (&h->got.glist); 8975 8976 for (gent = h->got.glist; gent != NULL; gent = gent->next) 8977 if (!gent->is_indirect) 8978 { 8979 /* Make sure this symbol is output as a dynamic symbol. 8980 Undefined weak syms won't yet be marked as dynamic, 8981 nor will all TLS symbols. */ 8982 if (h->dynindx == -1 8983 && !h->forced_local 8984 && h->type != STT_GNU_IFUNC 8985 && htab->elf.dynamic_sections_created) 8986 { 8987 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 8988 return FALSE; 8989 } 8990 8991 if (!is_ppc64_elf (gent->owner)) 8992 abort (); 8993 8994 allocate_got (h, info, gent); 8995 } 8996 8997 if (eh->dyn_relocs == NULL 8998 || (!htab->elf.dynamic_sections_created 8999 && h->type != STT_GNU_IFUNC)) 9000 return TRUE; 9001 9002 /* In the shared -Bsymbolic case, discard space allocated for 9003 dynamic pc-relative relocs against symbols which turn out to be 9004 defined in regular objects. For the normal shared case, discard 9005 space for relocs that have become local due to symbol visibility 9006 changes. */ 9007 9008 if (info->shared) 9009 { 9010 /* Relocs that use pc_count are those that appear on a call insn, 9011 or certain REL relocs (see must_be_dyn_reloc) that can be 9012 generated via assembly. We want calls to protected symbols to 9013 resolve directly to the function rather than going via the plt. 9014 If people want function pointer comparisons to work as expected 9015 then they should avoid writing weird assembly. */ 9016 if (SYMBOL_CALLS_LOCAL (info, h)) 9017 { 9018 struct elf_dyn_relocs **pp; 9019 9020 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 9021 { 9022 p->count -= p->pc_count; 9023 p->pc_count = 0; 9024 if (p->count == 0) 9025 *pp = p->next; 9026 else 9027 pp = &p->next; 9028 } 9029 } 9030 9031 /* Also discard relocs on undefined weak syms with non-default 9032 visibility. */ 9033 if (eh->dyn_relocs != NULL 9034 && h->root.type == bfd_link_hash_undefweak) 9035 { 9036 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 9037 eh->dyn_relocs = NULL; 9038 9039 /* Make sure this symbol is output as a dynamic symbol. 9040 Undefined weak syms won't yet be marked as dynamic. */ 9041 else if (h->dynindx == -1 9042 && !h->forced_local) 9043 { 9044 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 9045 return FALSE; 9046 } 9047 } 9048 } 9049 else if (h->type == STT_GNU_IFUNC) 9050 { 9051 if (!h->non_got_ref) 9052 eh->dyn_relocs = NULL; 9053 } 9054 else if (ELIMINATE_COPY_RELOCS) 9055 { 9056 /* For the non-shared case, discard space for relocs against 9057 symbols which turn out to need copy relocs or are not 9058 dynamic. */ 9059 9060 if (!h->non_got_ref 9061 && !h->def_regular) 9062 { 9063 /* Make sure this symbol is output as a dynamic symbol. 9064 Undefined weak syms won't yet be marked as dynamic. */ 9065 if (h->dynindx == -1 9066 && !h->forced_local) 9067 { 9068 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 9069 return FALSE; 9070 } 9071 9072 /* If that succeeded, we know we'll be keeping all the 9073 relocs. */ 9074 if (h->dynindx != -1) 9075 goto keep; 9076 } 9077 9078 eh->dyn_relocs = NULL; 9079 9080 keep: ; 9081 } 9082 9083 /* Finally, allocate space. */ 9084 for (p = eh->dyn_relocs; p != NULL; p = p->next) 9085 { 9086 asection *sreloc = elf_section_data (p->sec)->sreloc; 9087 if (!htab->elf.dynamic_sections_created) 9088 sreloc = htab->reliplt; 9089 sreloc->size += p->count * sizeof (Elf64_External_Rela); 9090 } 9091 9092 return TRUE; 9093 } 9094 9095 /* Find any dynamic relocs that apply to read-only sections. */ 9096 9097 static bfd_boolean 9098 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) 9099 { 9100 struct ppc_link_hash_entry *eh; 9101 struct elf_dyn_relocs *p; 9102 9103 eh = (struct ppc_link_hash_entry *) h; 9104 for (p = eh->dyn_relocs; p != NULL; p = p->next) 9105 { 9106 asection *s = p->sec->output_section; 9107 9108 if (s != NULL && (s->flags & SEC_READONLY) != 0) 9109 { 9110 struct bfd_link_info *info = inf; 9111 9112 if (info->warn_shared_textrel) 9113 (*_bfd_error_handler) 9114 (_("warning: dynamic relocation in readonly section `%s'"), 9115 h->root.root.string); 9116 info->flags |= DF_TEXTREL; 9117 9118 /* Not an error, just cut short the traversal. */ 9119 return FALSE; 9120 } 9121 } 9122 return TRUE; 9123 } 9124 9125 /* Set the sizes of the dynamic sections. */ 9126 9127 static bfd_boolean 9128 ppc64_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 9129 struct bfd_link_info *info) 9130 { 9131 struct ppc_link_hash_table *htab; 9132 bfd *dynobj; 9133 asection *s; 9134 bfd_boolean relocs; 9135 bfd *ibfd; 9136 struct got_entry *first_tlsld; 9137 9138 htab = ppc_hash_table (info); 9139 if (htab == NULL) 9140 return FALSE; 9141 9142 dynobj = htab->elf.dynobj; 9143 if (dynobj == NULL) 9144 abort (); 9145 9146 if (htab->elf.dynamic_sections_created) 9147 { 9148 /* Set the contents of the .interp section to the interpreter. */ 9149 if (info->executable) 9150 { 9151 s = bfd_get_linker_section (dynobj, ".interp"); 9152 if (s == NULL) 9153 abort (); 9154 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 9155 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 9156 } 9157 } 9158 9159 /* Set up .got offsets for local syms, and space for local dynamic 9160 relocs. */ 9161 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 9162 { 9163 struct got_entry **lgot_ents; 9164 struct got_entry **end_lgot_ents; 9165 struct plt_entry **local_plt; 9166 struct plt_entry **end_local_plt; 9167 unsigned char *lgot_masks; 9168 bfd_size_type locsymcount; 9169 Elf_Internal_Shdr *symtab_hdr; 9170 asection *srel; 9171 9172 if (!is_ppc64_elf (ibfd)) 9173 continue; 9174 9175 for (s = ibfd->sections; s != NULL; s = s->next) 9176 { 9177 struct elf_dyn_relocs *p; 9178 9179 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 9180 { 9181 if (!bfd_is_abs_section (p->sec) 9182 && bfd_is_abs_section (p->sec->output_section)) 9183 { 9184 /* Input section has been discarded, either because 9185 it is a copy of a linkonce section or due to 9186 linker script /DISCARD/, so we'll be discarding 9187 the relocs too. */ 9188 } 9189 else if (p->count != 0) 9190 { 9191 srel = elf_section_data (p->sec)->sreloc; 9192 if (!htab->elf.dynamic_sections_created) 9193 srel = htab->reliplt; 9194 srel->size += p->count * sizeof (Elf64_External_Rela); 9195 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 9196 { 9197 if (info->warn_shared_textrel) 9198 (*_bfd_error_handler) 9199 (_("warning: dynamic relocation in readonly section `%s'"), 9200 p->sec->output_section->name); 9201 info->flags |= DF_TEXTREL; 9202 } 9203 } 9204 } 9205 } 9206 9207 lgot_ents = elf_local_got_ents (ibfd); 9208 if (!lgot_ents) 9209 continue; 9210 9211 symtab_hdr = &elf_symtab_hdr (ibfd); 9212 locsymcount = symtab_hdr->sh_info; 9213 end_lgot_ents = lgot_ents + locsymcount; 9214 local_plt = (struct plt_entry **) end_lgot_ents; 9215 end_local_plt = local_plt + locsymcount; 9216 lgot_masks = (unsigned char *) end_local_plt; 9217 s = ppc64_elf_tdata (ibfd)->got; 9218 srel = ppc64_elf_tdata (ibfd)->relgot; 9219 for (; lgot_ents < end_lgot_ents; ++lgot_ents, ++lgot_masks) 9220 { 9221 struct got_entry **pent, *ent; 9222 9223 pent = lgot_ents; 9224 while ((ent = *pent) != NULL) 9225 if (ent->got.refcount > 0) 9226 { 9227 if ((ent->tls_type & *lgot_masks & TLS_LD) != 0) 9228 { 9229 ppc64_tlsld_got (ibfd)->got.refcount += 1; 9230 *pent = ent->next; 9231 } 9232 else 9233 { 9234 unsigned int num = 1; 9235 ent->got.offset = s->size; 9236 if ((ent->tls_type & *lgot_masks & TLS_GD) != 0) 9237 num = 2; 9238 s->size += num * 8; 9239 if (info->shared) 9240 srel->size += num * sizeof (Elf64_External_Rela); 9241 else if ((*lgot_masks & PLT_IFUNC) != 0) 9242 { 9243 htab->reliplt->size 9244 += num * sizeof (Elf64_External_Rela); 9245 htab->got_reli_size 9246 += num * sizeof (Elf64_External_Rela); 9247 } 9248 pent = &ent->next; 9249 } 9250 } 9251 else 9252 *pent = ent->next; 9253 } 9254 9255 /* Allocate space for calls to local STT_GNU_IFUNC syms in .iplt. */ 9256 for (; local_plt < end_local_plt; ++local_plt) 9257 { 9258 struct plt_entry *ent; 9259 9260 for (ent = *local_plt; ent != NULL; ent = ent->next) 9261 if (ent->plt.refcount > 0) 9262 { 9263 s = htab->iplt; 9264 ent->plt.offset = s->size; 9265 s->size += PLT_ENTRY_SIZE; 9266 9267 htab->reliplt->size += sizeof (Elf64_External_Rela); 9268 } 9269 else 9270 ent->plt.offset = (bfd_vma) -1; 9271 } 9272 } 9273 9274 /* Allocate global sym .plt and .got entries, and space for global 9275 sym dynamic relocs. */ 9276 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 9277 9278 first_tlsld = NULL; 9279 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 9280 { 9281 struct got_entry *ent; 9282 9283 if (!is_ppc64_elf (ibfd)) 9284 continue; 9285 9286 ent = ppc64_tlsld_got (ibfd); 9287 if (ent->got.refcount > 0) 9288 { 9289 if (!htab->do_multi_toc && first_tlsld != NULL) 9290 { 9291 ent->is_indirect = TRUE; 9292 ent->got.ent = first_tlsld; 9293 } 9294 else 9295 { 9296 if (first_tlsld == NULL) 9297 first_tlsld = ent; 9298 s = ppc64_elf_tdata (ibfd)->got; 9299 ent->got.offset = s->size; 9300 ent->owner = ibfd; 9301 s->size += 16; 9302 if (info->shared) 9303 { 9304 asection *srel = ppc64_elf_tdata (ibfd)->relgot; 9305 srel->size += sizeof (Elf64_External_Rela); 9306 } 9307 } 9308 } 9309 else 9310 ent->got.offset = (bfd_vma) -1; 9311 } 9312 9313 /* We now have determined the sizes of the various dynamic sections. 9314 Allocate memory for them. */ 9315 relocs = FALSE; 9316 for (s = dynobj->sections; s != NULL; s = s->next) 9317 { 9318 if ((s->flags & SEC_LINKER_CREATED) == 0) 9319 continue; 9320 9321 if (s == htab->brlt || s == htab->relbrlt) 9322 /* These haven't been allocated yet; don't strip. */ 9323 continue; 9324 else if (s == htab->got 9325 || s == htab->plt 9326 || s == htab->iplt 9327 || s == htab->glink 9328 || s == htab->dynbss) 9329 { 9330 /* Strip this section if we don't need it; see the 9331 comment below. */ 9332 } 9333 else if (s == htab->glink_eh_frame) 9334 { 9335 if (!bfd_is_abs_section (s->output_section)) 9336 /* Not sized yet. */ 9337 continue; 9338 } 9339 else if (CONST_STRNEQ (s->name, ".rela")) 9340 { 9341 if (s->size != 0) 9342 { 9343 if (s != htab->relplt) 9344 relocs = TRUE; 9345 9346 /* We use the reloc_count field as a counter if we need 9347 to copy relocs into the output file. */ 9348 s->reloc_count = 0; 9349 } 9350 } 9351 else 9352 { 9353 /* It's not one of our sections, so don't allocate space. */ 9354 continue; 9355 } 9356 9357 if (s->size == 0) 9358 { 9359 /* If we don't need this section, strip it from the 9360 output file. This is mostly to handle .rela.bss and 9361 .rela.plt. We must create both sections in 9362 create_dynamic_sections, because they must be created 9363 before the linker maps input sections to output 9364 sections. The linker does that before 9365 adjust_dynamic_symbol is called, and it is that 9366 function which decides whether anything needs to go 9367 into these sections. */ 9368 s->flags |= SEC_EXCLUDE; 9369 continue; 9370 } 9371 9372 if ((s->flags & SEC_HAS_CONTENTS) == 0) 9373 continue; 9374 9375 /* Allocate memory for the section contents. We use bfd_zalloc 9376 here in case unused entries are not reclaimed before the 9377 section's contents are written out. This should not happen, 9378 but this way if it does we get a R_PPC64_NONE reloc in .rela 9379 sections instead of garbage. 9380 We also rely on the section contents being zero when writing 9381 the GOT. */ 9382 s->contents = bfd_zalloc (dynobj, s->size); 9383 if (s->contents == NULL) 9384 return FALSE; 9385 } 9386 9387 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 9388 { 9389 if (!is_ppc64_elf (ibfd)) 9390 continue; 9391 9392 s = ppc64_elf_tdata (ibfd)->got; 9393 if (s != NULL && s != htab->got) 9394 { 9395 if (s->size == 0) 9396 s->flags |= SEC_EXCLUDE; 9397 else 9398 { 9399 s->contents = bfd_zalloc (ibfd, s->size); 9400 if (s->contents == NULL) 9401 return FALSE; 9402 } 9403 } 9404 s = ppc64_elf_tdata (ibfd)->relgot; 9405 if (s != NULL) 9406 { 9407 if (s->size == 0) 9408 s->flags |= SEC_EXCLUDE; 9409 else 9410 { 9411 s->contents = bfd_zalloc (ibfd, s->size); 9412 if (s->contents == NULL) 9413 return FALSE; 9414 relocs = TRUE; 9415 s->reloc_count = 0; 9416 } 9417 } 9418 } 9419 9420 if (htab->elf.dynamic_sections_created) 9421 { 9422 /* Add some entries to the .dynamic section. We fill in the 9423 values later, in ppc64_elf_finish_dynamic_sections, but we 9424 must add the entries now so that we get the correct size for 9425 the .dynamic section. The DT_DEBUG entry is filled in by the 9426 dynamic linker and used by the debugger. */ 9427 #define add_dynamic_entry(TAG, VAL) \ 9428 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 9429 9430 if (info->executable) 9431 { 9432 if (!add_dynamic_entry (DT_DEBUG, 0)) 9433 return FALSE; 9434 } 9435 9436 if (htab->plt != NULL && htab->plt->size != 0) 9437 { 9438 if (!add_dynamic_entry (DT_PLTGOT, 0) 9439 || !add_dynamic_entry (DT_PLTRELSZ, 0) 9440 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 9441 || !add_dynamic_entry (DT_JMPREL, 0) 9442 || !add_dynamic_entry (DT_PPC64_GLINK, 0)) 9443 return FALSE; 9444 } 9445 9446 if (NO_OPD_RELOCS) 9447 { 9448 if (!add_dynamic_entry (DT_PPC64_OPD, 0) 9449 || !add_dynamic_entry (DT_PPC64_OPDSZ, 0)) 9450 return FALSE; 9451 } 9452 9453 if (!htab->no_tls_get_addr_opt 9454 && htab->tls_get_addr_fd != NULL 9455 && htab->tls_get_addr_fd->elf.plt.plist != NULL 9456 && !add_dynamic_entry (DT_PPC64_TLSOPT, 0)) 9457 return FALSE; 9458 9459 if (relocs) 9460 { 9461 if (!add_dynamic_entry (DT_RELA, 0) 9462 || !add_dynamic_entry (DT_RELASZ, 0) 9463 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) 9464 return FALSE; 9465 9466 /* If any dynamic relocs apply to a read-only section, 9467 then we need a DT_TEXTREL entry. */ 9468 if ((info->flags & DF_TEXTREL) == 0) 9469 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info); 9470 9471 if ((info->flags & DF_TEXTREL) != 0) 9472 { 9473 if (!add_dynamic_entry (DT_TEXTREL, 0)) 9474 return FALSE; 9475 } 9476 } 9477 } 9478 #undef add_dynamic_entry 9479 9480 return TRUE; 9481 } 9482 9483 /* Determine the type of stub needed, if any, for a call. */ 9484 9485 static inline enum ppc_stub_type 9486 ppc_type_of_stub (asection *input_sec, 9487 const Elf_Internal_Rela *rel, 9488 struct ppc_link_hash_entry **hash, 9489 struct plt_entry **plt_ent, 9490 bfd_vma destination) 9491 { 9492 struct ppc_link_hash_entry *h = *hash; 9493 bfd_vma location; 9494 bfd_vma branch_offset; 9495 bfd_vma max_branch_offset; 9496 enum elf_ppc64_reloc_type r_type; 9497 9498 if (h != NULL) 9499 { 9500 struct plt_entry *ent; 9501 struct ppc_link_hash_entry *fdh = h; 9502 if (h->oh != NULL 9503 && h->oh->is_func_descriptor) 9504 { 9505 fdh = ppc_follow_link (h->oh); 9506 *hash = fdh; 9507 } 9508 9509 for (ent = fdh->elf.plt.plist; ent != NULL; ent = ent->next) 9510 if (ent->addend == rel->r_addend 9511 && ent->plt.offset != (bfd_vma) -1) 9512 { 9513 *plt_ent = ent; 9514 return ppc_stub_plt_call; 9515 } 9516 9517 /* Here, we know we don't have a plt entry. If we don't have a 9518 either a defined function descriptor or a defined entry symbol 9519 in a regular object file, then it is pointless trying to make 9520 any other type of stub. */ 9521 if (!is_static_defined (&fdh->elf) 9522 && !is_static_defined (&h->elf)) 9523 return ppc_stub_none; 9524 } 9525 else if (elf_local_got_ents (input_sec->owner) != NULL) 9526 { 9527 Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (input_sec->owner); 9528 struct plt_entry **local_plt = (struct plt_entry **) 9529 elf_local_got_ents (input_sec->owner) + symtab_hdr->sh_info; 9530 unsigned long r_symndx = ELF64_R_SYM (rel->r_info); 9531 9532 if (local_plt[r_symndx] != NULL) 9533 { 9534 struct plt_entry *ent; 9535 9536 for (ent = local_plt[r_symndx]; ent != NULL; ent = ent->next) 9537 if (ent->addend == rel->r_addend 9538 && ent->plt.offset != (bfd_vma) -1) 9539 { 9540 *plt_ent = ent; 9541 return ppc_stub_plt_call; 9542 } 9543 } 9544 } 9545 9546 /* Determine where the call point is. */ 9547 location = (input_sec->output_offset 9548 + input_sec->output_section->vma 9549 + rel->r_offset); 9550 9551 branch_offset = destination - location; 9552 r_type = ELF64_R_TYPE (rel->r_info); 9553 9554 /* Determine if a long branch stub is needed. */ 9555 max_branch_offset = 1 << 25; 9556 if (r_type != R_PPC64_REL24) 9557 max_branch_offset = 1 << 15; 9558 9559 if (branch_offset + max_branch_offset >= 2 * max_branch_offset) 9560 /* We need a stub. Figure out whether a long_branch or plt_branch 9561 is needed later. */ 9562 return ppc_stub_long_branch; 9563 9564 return ppc_stub_none; 9565 } 9566 9567 /* With power7 weakly ordered memory model, it is possible for ld.so 9568 to update a plt entry in one thread and have another thread see a 9569 stale zero toc entry. To avoid this we need some sort of acquire 9570 barrier in the call stub. One solution is to make the load of the 9571 toc word seem to appear to depend on the load of the function entry 9572 word. Another solution is to test for r2 being zero, and branch to 9573 the appropriate glink entry if so. 9574 9575 . fake dep barrier compare 9576 . ld 11,xxx(2) ld 11,xxx(2) 9577 . mtctr 11 mtctr 11 9578 . xor 11,11,11 ld 2,xxx+8(2) 9579 . add 2,2,11 cmpldi 2,0 9580 . ld 2,xxx+8(2) bnectr+ 9581 . bctr b <glink_entry> 9582 9583 The solution involving the compare turns out to be faster, so 9584 that's what we use unless the branch won't reach. */ 9585 9586 #define ALWAYS_USE_FAKE_DEP 0 9587 #define ALWAYS_EMIT_R2SAVE 0 9588 9589 #define PPC_LO(v) ((v) & 0xffff) 9590 #define PPC_HI(v) (((v) >> 16) & 0xffff) 9591 #define PPC_HA(v) PPC_HI ((v) + 0x8000) 9592 9593 static inline unsigned int 9594 plt_stub_size (struct ppc_link_hash_table *htab, 9595 struct ppc_stub_hash_entry *stub_entry, 9596 bfd_vma off) 9597 { 9598 unsigned size = PLT_CALL_STUB_SIZE; 9599 9600 if (!(ALWAYS_EMIT_R2SAVE 9601 || stub_entry->stub_type == ppc_stub_plt_call_r2save)) 9602 size -= 4; 9603 if (!htab->plt_static_chain) 9604 size -= 4; 9605 if (htab->plt_thread_safe) 9606 size += 8; 9607 if (PPC_HA (off) == 0) 9608 size -= 4; 9609 if (PPC_HA (off + 8 + 8 * htab->plt_static_chain) != PPC_HA (off)) 9610 size += 4; 9611 if (stub_entry->h != NULL 9612 && (stub_entry->h == htab->tls_get_addr_fd 9613 || stub_entry->h == htab->tls_get_addr) 9614 && !htab->no_tls_get_addr_opt) 9615 size += 13 * 4; 9616 return size; 9617 } 9618 9619 /* If this stub would cross fewer 2**plt_stub_align boundaries if we align, 9620 then return the padding needed to do so. */ 9621 static inline unsigned int 9622 plt_stub_pad (struct ppc_link_hash_table *htab, 9623 struct ppc_stub_hash_entry *stub_entry, 9624 bfd_vma plt_off) 9625 { 9626 int stub_align = 1 << htab->plt_stub_align; 9627 unsigned stub_size = plt_stub_size (htab, stub_entry, plt_off); 9628 bfd_vma stub_off = stub_entry->stub_sec->size; 9629 9630 if (((stub_off + stub_size - 1) & -stub_align) - (stub_off & -stub_align) 9631 > (stub_size & -stub_align)) 9632 return stub_align - (stub_off & (stub_align - 1)); 9633 return 0; 9634 } 9635 9636 /* Build a .plt call stub. */ 9637 9638 static inline bfd_byte * 9639 build_plt_stub (struct ppc_link_hash_table *htab, 9640 struct ppc_stub_hash_entry *stub_entry, 9641 bfd_byte *p, bfd_vma offset, Elf_Internal_Rela *r) 9642 { 9643 bfd *obfd = htab->stub_bfd; 9644 bfd_boolean plt_static_chain = htab->plt_static_chain; 9645 bfd_boolean plt_thread_safe = htab->plt_thread_safe; 9646 bfd_boolean use_fake_dep = plt_thread_safe; 9647 bfd_vma cmp_branch_off = 0; 9648 9649 if (!ALWAYS_USE_FAKE_DEP 9650 && plt_thread_safe 9651 && !(stub_entry->h != NULL 9652 && (stub_entry->h == htab->tls_get_addr_fd 9653 || stub_entry->h == htab->tls_get_addr) 9654 && !htab->no_tls_get_addr_opt)) 9655 { 9656 bfd_vma pltoff = stub_entry->plt_ent->plt.offset & ~1; 9657 bfd_vma pltindex = (pltoff - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE; 9658 bfd_vma glinkoff = GLINK_CALL_STUB_SIZE + pltindex * 8; 9659 bfd_vma to, from; 9660 9661 if (pltindex > 32768) 9662 glinkoff += (pltindex - 32768) * 4; 9663 to = (glinkoff 9664 + htab->glink->output_offset 9665 + htab->glink->output_section->vma); 9666 from = (p - stub_entry->stub_sec->contents 9667 + 4 * (ALWAYS_EMIT_R2SAVE 9668 || stub_entry->stub_type == ppc_stub_plt_call_r2save) 9669 + 4 * (PPC_HA (offset) != 0) 9670 + 4 * (PPC_HA (offset + 8 + 8 * plt_static_chain) 9671 != PPC_HA (offset)) 9672 + 4 * (plt_static_chain != 0) 9673 + 20 9674 + stub_entry->stub_sec->output_offset 9675 + stub_entry->stub_sec->output_section->vma); 9676 cmp_branch_off = to - from; 9677 use_fake_dep = cmp_branch_off + (1 << 25) >= (1 << 26); 9678 } 9679 9680 if (PPC_HA (offset) != 0) 9681 { 9682 if (r != NULL) 9683 { 9684 if (ALWAYS_EMIT_R2SAVE 9685 || stub_entry->stub_type == ppc_stub_plt_call_r2save) 9686 r[0].r_offset += 4; 9687 r[0].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_HA); 9688 r[1].r_offset = r[0].r_offset + 4; 9689 r[1].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_LO_DS); 9690 r[1].r_addend = r[0].r_addend; 9691 if (PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset)) 9692 { 9693 r[2].r_offset = r[1].r_offset + 4; 9694 r[2].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_LO); 9695 r[2].r_addend = r[0].r_addend; 9696 } 9697 else 9698 { 9699 r[2].r_offset = r[1].r_offset + 8 + 8 * use_fake_dep; 9700 r[2].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_LO_DS); 9701 r[2].r_addend = r[0].r_addend + 8; 9702 if (plt_static_chain) 9703 { 9704 r[3].r_offset = r[2].r_offset + 4; 9705 r[3].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_LO_DS); 9706 r[3].r_addend = r[0].r_addend + 16; 9707 } 9708 } 9709 } 9710 if (ALWAYS_EMIT_R2SAVE 9711 || stub_entry->stub_type == ppc_stub_plt_call_r2save) 9712 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4; 9713 bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4; 9714 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4; 9715 if (PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset)) 9716 { 9717 bfd_put_32 (obfd, ADDI_R12_R12 | PPC_LO (offset), p), p += 4; 9718 offset = 0; 9719 } 9720 bfd_put_32 (obfd, MTCTR_R11, p), p += 4; 9721 if (use_fake_dep) 9722 { 9723 bfd_put_32 (obfd, XOR_R11_R11_R11, p), p += 4; 9724 bfd_put_32 (obfd, ADD_R12_R12_R11, p), p += 4; 9725 } 9726 bfd_put_32 (obfd, LD_R2_0R12 | PPC_LO (offset + 8), p), p += 4; 9727 if (plt_static_chain) 9728 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset + 16), p), p += 4; 9729 } 9730 else 9731 { 9732 if (r != NULL) 9733 { 9734 if (ALWAYS_EMIT_R2SAVE 9735 || stub_entry->stub_type == ppc_stub_plt_call_r2save) 9736 r[0].r_offset += 4; 9737 r[0].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_DS); 9738 if (PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset)) 9739 { 9740 r[1].r_offset = r[0].r_offset + 4; 9741 r[1].r_info = ELF64_R_INFO (0, R_PPC64_TOC16); 9742 r[1].r_addend = r[0].r_addend; 9743 } 9744 else 9745 { 9746 r[1].r_offset = r[0].r_offset + 8 + 8 * use_fake_dep; 9747 r[1].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_DS); 9748 r[1].r_addend = r[0].r_addend + 8 + 8 * plt_static_chain; 9749 if (plt_static_chain) 9750 { 9751 r[2].r_offset = r[1].r_offset + 4; 9752 r[2].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_DS); 9753 r[2].r_addend = r[0].r_addend + 8; 9754 } 9755 } 9756 } 9757 if (ALWAYS_EMIT_R2SAVE 9758 || stub_entry->stub_type == ppc_stub_plt_call_r2save) 9759 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4; 9760 bfd_put_32 (obfd, LD_R11_0R2 | PPC_LO (offset), p), p += 4; 9761 if (PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset)) 9762 { 9763 bfd_put_32 (obfd, ADDI_R2_R2 | PPC_LO (offset), p), p += 4; 9764 offset = 0; 9765 } 9766 bfd_put_32 (obfd, MTCTR_R11, p), p += 4; 9767 if (use_fake_dep) 9768 { 9769 bfd_put_32 (obfd, XOR_R11_R11_R11, p), p += 4; 9770 bfd_put_32 (obfd, ADD_R2_R2_R11, p), p += 4; 9771 } 9772 if (plt_static_chain) 9773 bfd_put_32 (obfd, LD_R11_0R2 | PPC_LO (offset + 16), p), p += 4; 9774 bfd_put_32 (obfd, LD_R2_0R2 | PPC_LO (offset + 8), p), p += 4; 9775 } 9776 if (plt_thread_safe && !use_fake_dep) 9777 { 9778 bfd_put_32 (obfd, CMPLDI_R2_0, p), p += 4; 9779 bfd_put_32 (obfd, BNECTR_P4, p), p += 4; 9780 bfd_put_32 (obfd, B_DOT | (cmp_branch_off & 0x3fffffc), p), p += 4; 9781 } 9782 else 9783 bfd_put_32 (obfd, BCTR, p), p += 4; 9784 return p; 9785 } 9786 9787 /* Build a special .plt call stub for __tls_get_addr. */ 9788 9789 #define LD_R11_0R3 0xe9630000 9790 #define LD_R12_0R3 0xe9830000 9791 #define MR_R0_R3 0x7c601b78 9792 #define CMPDI_R11_0 0x2c2b0000 9793 #define ADD_R3_R12_R13 0x7c6c6a14 9794 #define BEQLR 0x4d820020 9795 #define MR_R3_R0 0x7c030378 9796 #define MFLR_R11 0x7d6802a6 9797 #define STD_R11_0R1 0xf9610000 9798 #define BCTRL 0x4e800421 9799 #define LD_R11_0R1 0xe9610000 9800 #define LD_R2_0R1 0xe8410000 9801 #define MTLR_R11 0x7d6803a6 9802 9803 static inline bfd_byte * 9804 build_tls_get_addr_stub (struct ppc_link_hash_table *htab, 9805 struct ppc_stub_hash_entry *stub_entry, 9806 bfd_byte *p, bfd_vma offset, Elf_Internal_Rela *r) 9807 { 9808 bfd *obfd = htab->stub_bfd; 9809 9810 bfd_put_32 (obfd, LD_R11_0R3 + 0, p), p += 4; 9811 bfd_put_32 (obfd, LD_R12_0R3 + 8, p), p += 4; 9812 bfd_put_32 (obfd, MR_R0_R3, p), p += 4; 9813 bfd_put_32 (obfd, CMPDI_R11_0, p), p += 4; 9814 bfd_put_32 (obfd, ADD_R3_R12_R13, p), p += 4; 9815 bfd_put_32 (obfd, BEQLR, p), p += 4; 9816 bfd_put_32 (obfd, MR_R3_R0, p), p += 4; 9817 bfd_put_32 (obfd, MFLR_R11, p), p += 4; 9818 bfd_put_32 (obfd, STD_R11_0R1 + 32, p), p += 4; 9819 9820 if (r != NULL) 9821 r[0].r_offset += 9 * 4; 9822 p = build_plt_stub (htab, stub_entry, p, offset, r); 9823 bfd_put_32 (obfd, BCTRL, p - 4); 9824 9825 bfd_put_32 (obfd, LD_R11_0R1 + 32, p), p += 4; 9826 bfd_put_32 (obfd, LD_R2_0R1 + 40, p), p += 4; 9827 bfd_put_32 (obfd, MTLR_R11, p), p += 4; 9828 bfd_put_32 (obfd, BLR, p), p += 4; 9829 9830 return p; 9831 } 9832 9833 static Elf_Internal_Rela * 9834 get_relocs (asection *sec, int count) 9835 { 9836 Elf_Internal_Rela *relocs; 9837 struct bfd_elf_section_data *elfsec_data; 9838 9839 elfsec_data = elf_section_data (sec); 9840 relocs = elfsec_data->relocs; 9841 if (relocs == NULL) 9842 { 9843 bfd_size_type relsize; 9844 relsize = sec->reloc_count * sizeof (*relocs); 9845 relocs = bfd_alloc (sec->owner, relsize); 9846 if (relocs == NULL) 9847 return NULL; 9848 elfsec_data->relocs = relocs; 9849 elfsec_data->rela.hdr = bfd_zalloc (sec->owner, 9850 sizeof (Elf_Internal_Shdr)); 9851 if (elfsec_data->rela.hdr == NULL) 9852 return NULL; 9853 elfsec_data->rela.hdr->sh_size = (sec->reloc_count 9854 * sizeof (Elf64_External_Rela)); 9855 elfsec_data->rela.hdr->sh_entsize = sizeof (Elf64_External_Rela); 9856 sec->reloc_count = 0; 9857 } 9858 relocs += sec->reloc_count; 9859 sec->reloc_count += count; 9860 return relocs; 9861 } 9862 9863 static bfd_vma 9864 get_r2off (struct bfd_link_info *info, 9865 struct ppc_stub_hash_entry *stub_entry) 9866 { 9867 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9868 bfd_vma r2off = htab->stub_group[stub_entry->target_section->id].toc_off; 9869 9870 if (r2off == 0) 9871 { 9872 /* Support linking -R objects. Get the toc pointer from the 9873 opd entry. */ 9874 char buf[8]; 9875 asection *opd = stub_entry->h->elf.root.u.def.section; 9876 bfd_vma opd_off = stub_entry->h->elf.root.u.def.value; 9877 9878 if (strcmp (opd->name, ".opd") != 0 9879 || opd->reloc_count != 0) 9880 { 9881 info->callbacks->einfo (_("%P: cannot find opd entry toc for `%T'\n"), 9882 stub_entry->h->elf.root.root.string); 9883 bfd_set_error (bfd_error_bad_value); 9884 return 0; 9885 } 9886 if (!bfd_get_section_contents (opd->owner, opd, buf, opd_off + 8, 8)) 9887 return 0; 9888 r2off = bfd_get_64 (opd->owner, buf); 9889 r2off -= elf_gp (info->output_bfd); 9890 } 9891 r2off -= htab->stub_group[stub_entry->id_sec->id].toc_off; 9892 return r2off; 9893 } 9894 9895 static bfd_boolean 9896 ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) 9897 { 9898 struct ppc_stub_hash_entry *stub_entry; 9899 struct ppc_branch_hash_entry *br_entry; 9900 struct bfd_link_info *info; 9901 struct ppc_link_hash_table *htab; 9902 bfd_byte *loc; 9903 bfd_byte *p; 9904 bfd_vma dest, off; 9905 int size; 9906 Elf_Internal_Rela *r; 9907 asection *plt; 9908 9909 /* Massage our args to the form they really have. */ 9910 stub_entry = (struct ppc_stub_hash_entry *) gen_entry; 9911 info = in_arg; 9912 9913 htab = ppc_hash_table (info); 9914 if (htab == NULL) 9915 return FALSE; 9916 9917 /* Make a note of the offset within the stubs for this entry. */ 9918 stub_entry->stub_offset = stub_entry->stub_sec->size; 9919 loc = stub_entry->stub_sec->contents + stub_entry->stub_offset; 9920 9921 htab->stub_count[stub_entry->stub_type - 1] += 1; 9922 switch (stub_entry->stub_type) 9923 { 9924 case ppc_stub_long_branch: 9925 case ppc_stub_long_branch_r2off: 9926 /* Branches are relative. This is where we are going to. */ 9927 off = dest = (stub_entry->target_value 9928 + stub_entry->target_section->output_offset 9929 + stub_entry->target_section->output_section->vma); 9930 9931 /* And this is where we are coming from. */ 9932 off -= (stub_entry->stub_offset 9933 + stub_entry->stub_sec->output_offset 9934 + stub_entry->stub_sec->output_section->vma); 9935 9936 size = 4; 9937 if (stub_entry->stub_type == ppc_stub_long_branch_r2off) 9938 { 9939 bfd_vma r2off = get_r2off (info, stub_entry); 9940 9941 if (r2off == 0) 9942 { 9943 htab->stub_error = TRUE; 9944 return FALSE; 9945 } 9946 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc); 9947 loc += 4; 9948 size = 12; 9949 if (PPC_HA (r2off) != 0) 9950 { 9951 size = 16; 9952 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc); 9953 loc += 4; 9954 } 9955 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc); 9956 loc += 4; 9957 off -= size - 4; 9958 } 9959 bfd_put_32 (htab->stub_bfd, B_DOT | (off & 0x3fffffc), loc); 9960 9961 if (off + (1 << 25) >= (bfd_vma) (1 << 26)) 9962 { 9963 info->callbacks->einfo 9964 (_("%P: long branch stub `%s' offset overflow\n"), 9965 stub_entry->root.string); 9966 htab->stub_error = TRUE; 9967 return FALSE; 9968 } 9969 9970 if (info->emitrelocations) 9971 { 9972 r = get_relocs (stub_entry->stub_sec, 1); 9973 if (r == NULL) 9974 return FALSE; 9975 r->r_offset = loc - stub_entry->stub_sec->contents; 9976 r->r_info = ELF64_R_INFO (0, R_PPC64_REL24); 9977 r->r_addend = dest; 9978 if (stub_entry->h != NULL) 9979 { 9980 struct elf_link_hash_entry **hashes; 9981 unsigned long symndx; 9982 struct ppc_link_hash_entry *h; 9983 9984 hashes = elf_sym_hashes (htab->stub_bfd); 9985 if (hashes == NULL) 9986 { 9987 bfd_size_type hsize; 9988 9989 hsize = (htab->stub_globals + 1) * sizeof (*hashes); 9990 hashes = bfd_zalloc (htab->stub_bfd, hsize); 9991 if (hashes == NULL) 9992 return FALSE; 9993 elf_sym_hashes (htab->stub_bfd) = hashes; 9994 htab->stub_globals = 1; 9995 } 9996 symndx = htab->stub_globals++; 9997 h = stub_entry->h; 9998 hashes[symndx] = &h->elf; 9999 r->r_info = ELF64_R_INFO (symndx, R_PPC64_REL24); 10000 if (h->oh != NULL && h->oh->is_func) 10001 h = ppc_follow_link (h->oh); 10002 if (h->elf.root.u.def.section != stub_entry->target_section) 10003 /* H is an opd symbol. The addend must be zero. */ 10004 r->r_addend = 0; 10005 else 10006 { 10007 off = (h->elf.root.u.def.value 10008 + h->elf.root.u.def.section->output_offset 10009 + h->elf.root.u.def.section->output_section->vma); 10010 r->r_addend -= off; 10011 } 10012 } 10013 } 10014 break; 10015 10016 case ppc_stub_plt_branch: 10017 case ppc_stub_plt_branch_r2off: 10018 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, 10019 stub_entry->root.string + 9, 10020 FALSE, FALSE); 10021 if (br_entry == NULL) 10022 { 10023 info->callbacks->einfo (_("%P: can't find branch stub `%s'\n"), 10024 stub_entry->root.string); 10025 htab->stub_error = TRUE; 10026 return FALSE; 10027 } 10028 10029 dest = (stub_entry->target_value 10030 + stub_entry->target_section->output_offset 10031 + stub_entry->target_section->output_section->vma); 10032 10033 bfd_put_64 (htab->brlt->owner, dest, 10034 htab->brlt->contents + br_entry->offset); 10035 10036 if (br_entry->iter == htab->stub_iteration) 10037 { 10038 br_entry->iter = 0; 10039 10040 if (htab->relbrlt != NULL) 10041 { 10042 /* Create a reloc for the branch lookup table entry. */ 10043 Elf_Internal_Rela rela; 10044 bfd_byte *rl; 10045 10046 rela.r_offset = (br_entry->offset 10047 + htab->brlt->output_offset 10048 + htab->brlt->output_section->vma); 10049 rela.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 10050 rela.r_addend = dest; 10051 10052 rl = htab->relbrlt->contents; 10053 rl += (htab->relbrlt->reloc_count++ 10054 * sizeof (Elf64_External_Rela)); 10055 bfd_elf64_swap_reloca_out (htab->relbrlt->owner, &rela, rl); 10056 } 10057 else if (info->emitrelocations) 10058 { 10059 r = get_relocs (htab->brlt, 1); 10060 if (r == NULL) 10061 return FALSE; 10062 /* brlt, being SEC_LINKER_CREATED does not go through the 10063 normal reloc processing. Symbols and offsets are not 10064 translated from input file to output file form, so 10065 set up the offset per the output file. */ 10066 r->r_offset = (br_entry->offset 10067 + htab->brlt->output_offset 10068 + htab->brlt->output_section->vma); 10069 r->r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 10070 r->r_addend = dest; 10071 } 10072 } 10073 10074 dest = (br_entry->offset 10075 + htab->brlt->output_offset 10076 + htab->brlt->output_section->vma); 10077 10078 off = (dest 10079 - elf_gp (htab->brlt->output_section->owner) 10080 - htab->stub_group[stub_entry->id_sec->id].toc_off); 10081 10082 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) 10083 { 10084 info->callbacks->einfo 10085 (_("%P: linkage table error against `%T'\n"), 10086 stub_entry->root.string); 10087 bfd_set_error (bfd_error_bad_value); 10088 htab->stub_error = TRUE; 10089 return FALSE; 10090 } 10091 10092 if (info->emitrelocations) 10093 { 10094 r = get_relocs (stub_entry->stub_sec, 1 + (PPC_HA (off) != 0)); 10095 if (r == NULL) 10096 return FALSE; 10097 r[0].r_offset = loc - stub_entry->stub_sec->contents; 10098 if (bfd_big_endian (info->output_bfd)) 10099 r[0].r_offset += 2; 10100 if (stub_entry->stub_type == ppc_stub_plt_branch_r2off) 10101 r[0].r_offset += 4; 10102 r[0].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_DS); 10103 r[0].r_addend = dest; 10104 if (PPC_HA (off) != 0) 10105 { 10106 r[0].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_HA); 10107 r[1].r_offset = r[0].r_offset + 4; 10108 r[1].r_info = ELF64_R_INFO (0, R_PPC64_TOC16_LO_DS); 10109 r[1].r_addend = r[0].r_addend; 10110 } 10111 } 10112 10113 if (stub_entry->stub_type != ppc_stub_plt_branch_r2off) 10114 { 10115 if (PPC_HA (off) != 0) 10116 { 10117 size = 16; 10118 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (off), loc); 10119 loc += 4; 10120 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (off), loc); 10121 } 10122 else 10123 { 10124 size = 12; 10125 bfd_put_32 (htab->stub_bfd, LD_R11_0R2 | PPC_LO (off), loc); 10126 } 10127 } 10128 else 10129 { 10130 bfd_vma r2off = get_r2off (info, stub_entry); 10131 10132 if (r2off == 0) 10133 { 10134 htab->stub_error = TRUE; 10135 return FALSE; 10136 } 10137 10138 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc); 10139 loc += 4; 10140 size = 20; 10141 if (PPC_HA (off) != 0) 10142 { 10143 size += 4; 10144 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (off), loc); 10145 loc += 4; 10146 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (off), loc); 10147 loc += 4; 10148 } 10149 else 10150 { 10151 bfd_put_32 (htab->stub_bfd, LD_R11_0R2 | PPC_LO (off), loc); 10152 loc += 4; 10153 } 10154 10155 if (PPC_HA (r2off) != 0) 10156 { 10157 size += 4; 10158 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc); 10159 loc += 4; 10160 } 10161 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc); 10162 } 10163 loc += 4; 10164 bfd_put_32 (htab->stub_bfd, MTCTR_R11, loc); 10165 loc += 4; 10166 bfd_put_32 (htab->stub_bfd, BCTR, loc); 10167 break; 10168 10169 case ppc_stub_plt_call: 10170 case ppc_stub_plt_call_r2save: 10171 if (stub_entry->h != NULL 10172 && stub_entry->h->is_func_descriptor 10173 && stub_entry->h->oh != NULL) 10174 { 10175 struct ppc_link_hash_entry *fh = ppc_follow_link (stub_entry->h->oh); 10176 10177 /* If the old-ABI "dot-symbol" is undefined make it weak so 10178 we don't get a link error from RELOC_FOR_GLOBAL_SYMBOL. 10179 FIXME: We used to define the symbol on one of the call 10180 stubs instead, which is why we test symbol section id 10181 against htab->top_id in various places. Likely all 10182 these checks could now disappear. */ 10183 if (fh->elf.root.type == bfd_link_hash_undefined) 10184 fh->elf.root.type = bfd_link_hash_undefweak; 10185 /* Stop undo_symbol_twiddle changing it back to undefined. */ 10186 fh->was_undefined = 0; 10187 } 10188 10189 /* Now build the stub. */ 10190 dest = stub_entry->plt_ent->plt.offset & ~1; 10191 if (dest >= (bfd_vma) -2) 10192 abort (); 10193 10194 plt = htab->plt; 10195 if (!htab->elf.dynamic_sections_created 10196 || stub_entry->h == NULL 10197 || stub_entry->h->elf.dynindx == -1) 10198 plt = htab->iplt; 10199 10200 dest += plt->output_offset + plt->output_section->vma; 10201 10202 if (stub_entry->h == NULL 10203 && (stub_entry->plt_ent->plt.offset & 1) == 0) 10204 { 10205 Elf_Internal_Rela rela; 10206 bfd_byte *rl; 10207 10208 rela.r_offset = dest; 10209 rela.r_info = ELF64_R_INFO (0, R_PPC64_JMP_IREL); 10210 rela.r_addend = (stub_entry->target_value 10211 + stub_entry->target_section->output_offset 10212 + stub_entry->target_section->output_section->vma); 10213 10214 rl = (htab->reliplt->contents 10215 + (htab->reliplt->reloc_count++ 10216 * sizeof (Elf64_External_Rela))); 10217 bfd_elf64_swap_reloca_out (info->output_bfd, &rela, rl); 10218 stub_entry->plt_ent->plt.offset |= 1; 10219 } 10220 10221 off = (dest 10222 - elf_gp (plt->output_section->owner) 10223 - htab->stub_group[stub_entry->id_sec->id].toc_off); 10224 10225 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) 10226 { 10227 info->callbacks->einfo 10228 (_("%P: linkage table error against `%T'\n"), 10229 stub_entry->h != NULL 10230 ? stub_entry->h->elf.root.root.string 10231 : "<local sym>"); 10232 bfd_set_error (bfd_error_bad_value); 10233 htab->stub_error = TRUE; 10234 return FALSE; 10235 } 10236 10237 if (htab->plt_stub_align != 0) 10238 { 10239 unsigned pad = plt_stub_pad (htab, stub_entry, off); 10240 10241 stub_entry->stub_sec->size += pad; 10242 stub_entry->stub_offset = stub_entry->stub_sec->size; 10243 loc += pad; 10244 } 10245 10246 r = NULL; 10247 if (info->emitrelocations) 10248 { 10249 r = get_relocs (stub_entry->stub_sec, 10250 (2 10251 + (PPC_HA (off) != 0) 10252 + (htab->plt_static_chain 10253 && PPC_HA (off + 16) == PPC_HA (off)))); 10254 if (r == NULL) 10255 return FALSE; 10256 r[0].r_offset = loc - stub_entry->stub_sec->contents; 10257 if (bfd_big_endian (info->output_bfd)) 10258 r[0].r_offset += 2; 10259 r[0].r_addend = dest; 10260 } 10261 if (stub_entry->h != NULL 10262 && (stub_entry->h == htab->tls_get_addr_fd 10263 || stub_entry->h == htab->tls_get_addr) 10264 && !htab->no_tls_get_addr_opt) 10265 p = build_tls_get_addr_stub (htab, stub_entry, loc, off, r); 10266 else 10267 p = build_plt_stub (htab, stub_entry, loc, off, r); 10268 size = p - loc; 10269 break; 10270 10271 default: 10272 BFD_FAIL (); 10273 return FALSE; 10274 } 10275 10276 stub_entry->stub_sec->size += size; 10277 10278 if (htab->emit_stub_syms) 10279 { 10280 struct elf_link_hash_entry *h; 10281 size_t len1, len2; 10282 char *name; 10283 const char *const stub_str[] = { "long_branch", 10284 "long_branch_r2off", 10285 "plt_branch", 10286 "plt_branch_r2off", 10287 "plt_call", 10288 "plt_call" }; 10289 10290 len1 = strlen (stub_str[stub_entry->stub_type - 1]); 10291 len2 = strlen (stub_entry->root.string); 10292 name = bfd_malloc (len1 + len2 + 2); 10293 if (name == NULL) 10294 return FALSE; 10295 memcpy (name, stub_entry->root.string, 9); 10296 memcpy (name + 9, stub_str[stub_entry->stub_type - 1], len1); 10297 memcpy (name + len1 + 9, stub_entry->root.string + 8, len2 - 8 + 1); 10298 h = elf_link_hash_lookup (&htab->elf, name, TRUE, FALSE, FALSE); 10299 if (h == NULL) 10300 return FALSE; 10301 if (h->root.type == bfd_link_hash_new) 10302 { 10303 h->root.type = bfd_link_hash_defined; 10304 h->root.u.def.section = stub_entry->stub_sec; 10305 h->root.u.def.value = stub_entry->stub_offset; 10306 h->ref_regular = 1; 10307 h->def_regular = 1; 10308 h->ref_regular_nonweak = 1; 10309 h->forced_local = 1; 10310 h->non_elf = 0; 10311 } 10312 } 10313 10314 return TRUE; 10315 } 10316 10317 /* As above, but don't actually build the stub. Just bump offset so 10318 we know stub section sizes, and select plt_branch stubs where 10319 long_branch stubs won't do. */ 10320 10321 static bfd_boolean 10322 ppc_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) 10323 { 10324 struct ppc_stub_hash_entry *stub_entry; 10325 struct bfd_link_info *info; 10326 struct ppc_link_hash_table *htab; 10327 bfd_vma off; 10328 int size; 10329 10330 /* Massage our args to the form they really have. */ 10331 stub_entry = (struct ppc_stub_hash_entry *) gen_entry; 10332 info = in_arg; 10333 10334 htab = ppc_hash_table (info); 10335 if (htab == NULL) 10336 return FALSE; 10337 10338 if (stub_entry->stub_type == ppc_stub_plt_call 10339 || stub_entry->stub_type == ppc_stub_plt_call_r2save) 10340 { 10341 asection *plt; 10342 off = stub_entry->plt_ent->plt.offset & ~(bfd_vma) 1; 10343 if (off >= (bfd_vma) -2) 10344 abort (); 10345 plt = htab->plt; 10346 if (!htab->elf.dynamic_sections_created 10347 || stub_entry->h == NULL 10348 || stub_entry->h->elf.dynindx == -1) 10349 plt = htab->iplt; 10350 off += (plt->output_offset 10351 + plt->output_section->vma 10352 - elf_gp (plt->output_section->owner) 10353 - htab->stub_group[stub_entry->id_sec->id].toc_off); 10354 10355 size = plt_stub_size (htab, stub_entry, off); 10356 if (htab->plt_stub_align) 10357 size += plt_stub_pad (htab, stub_entry, off); 10358 if (info->emitrelocations) 10359 { 10360 stub_entry->stub_sec->reloc_count 10361 += (2 10362 + (PPC_HA (off) != 0) 10363 + (htab->plt_static_chain 10364 && PPC_HA (off + 16) == PPC_HA (off))); 10365 stub_entry->stub_sec->flags |= SEC_RELOC; 10366 } 10367 } 10368 else 10369 { 10370 /* ppc_stub_long_branch or ppc_stub_plt_branch, or their r2off 10371 variants. */ 10372 bfd_vma r2off = 0; 10373 10374 off = (stub_entry->target_value 10375 + stub_entry->target_section->output_offset 10376 + stub_entry->target_section->output_section->vma); 10377 off -= (stub_entry->stub_sec->size 10378 + stub_entry->stub_sec->output_offset 10379 + stub_entry->stub_sec->output_section->vma); 10380 10381 /* Reset the stub type from the plt variant in case we now 10382 can reach with a shorter stub. */ 10383 if (stub_entry->stub_type >= ppc_stub_plt_branch) 10384 stub_entry->stub_type += ppc_stub_long_branch - ppc_stub_plt_branch; 10385 10386 size = 4; 10387 if (stub_entry->stub_type == ppc_stub_long_branch_r2off) 10388 { 10389 r2off = get_r2off (info, stub_entry); 10390 if (r2off == 0) 10391 { 10392 htab->stub_error = TRUE; 10393 return FALSE; 10394 } 10395 size = 12; 10396 if (PPC_HA (r2off) != 0) 10397 size = 16; 10398 off -= size - 4; 10399 } 10400 10401 /* If the branch offset if too big, use a ppc_stub_plt_branch. */ 10402 if (off + (1 << 25) >= (bfd_vma) (1 << 26)) 10403 { 10404 struct ppc_branch_hash_entry *br_entry; 10405 10406 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, 10407 stub_entry->root.string + 9, 10408 TRUE, FALSE); 10409 if (br_entry == NULL) 10410 { 10411 info->callbacks->einfo (_("%P: can't build branch stub `%s'\n"), 10412 stub_entry->root.string); 10413 htab->stub_error = TRUE; 10414 return FALSE; 10415 } 10416 10417 if (br_entry->iter != htab->stub_iteration) 10418 { 10419 br_entry->iter = htab->stub_iteration; 10420 br_entry->offset = htab->brlt->size; 10421 htab->brlt->size += 8; 10422 10423 if (htab->relbrlt != NULL) 10424 htab->relbrlt->size += sizeof (Elf64_External_Rela); 10425 else if (info->emitrelocations) 10426 { 10427 htab->brlt->reloc_count += 1; 10428 htab->brlt->flags |= SEC_RELOC; 10429 } 10430 } 10431 10432 stub_entry->stub_type += ppc_stub_plt_branch - ppc_stub_long_branch; 10433 off = (br_entry->offset 10434 + htab->brlt->output_offset 10435 + htab->brlt->output_section->vma 10436 - elf_gp (htab->brlt->output_section->owner) 10437 - htab->stub_group[stub_entry->id_sec->id].toc_off); 10438 10439 if (info->emitrelocations) 10440 { 10441 stub_entry->stub_sec->reloc_count += 1 + (PPC_HA (off) != 0); 10442 stub_entry->stub_sec->flags |= SEC_RELOC; 10443 } 10444 10445 if (stub_entry->stub_type != ppc_stub_plt_branch_r2off) 10446 { 10447 size = 12; 10448 if (PPC_HA (off) != 0) 10449 size = 16; 10450 } 10451 else 10452 { 10453 size = 20; 10454 if (PPC_HA (off) != 0) 10455 size += 4; 10456 10457 if (PPC_HA (r2off) != 0) 10458 size += 4; 10459 } 10460 } 10461 else if (info->emitrelocations) 10462 { 10463 stub_entry->stub_sec->reloc_count += 1; 10464 stub_entry->stub_sec->flags |= SEC_RELOC; 10465 } 10466 } 10467 10468 stub_entry->stub_sec->size += size; 10469 return TRUE; 10470 } 10471 10472 /* Set up various things so that we can make a list of input sections 10473 for each output section included in the link. Returns -1 on error, 10474 0 when no stubs will be needed, and 1 on success. */ 10475 10476 int 10477 ppc64_elf_setup_section_lists 10478 (struct bfd_link_info *info, 10479 asection *(*add_stub_section) (const char *, asection *), 10480 void (*layout_sections_again) (void)) 10481 { 10482 bfd *input_bfd; 10483 int top_id, top_index, id; 10484 asection *section; 10485 asection **input_list; 10486 bfd_size_type amt; 10487 struct ppc_link_hash_table *htab = ppc_hash_table (info); 10488 10489 if (htab == NULL) 10490 return -1; 10491 /* Stash our params away. */ 10492 htab->add_stub_section = add_stub_section; 10493 htab->layout_sections_again = layout_sections_again; 10494 10495 if (htab->brlt == NULL) 10496 return 0; 10497 10498 /* Find the top input section id. */ 10499 for (input_bfd = info->input_bfds, top_id = 3; 10500 input_bfd != NULL; 10501 input_bfd = input_bfd->link_next) 10502 { 10503 for (section = input_bfd->sections; 10504 section != NULL; 10505 section = section->next) 10506 { 10507 if (top_id < section->id) 10508 top_id = section->id; 10509 } 10510 } 10511 10512 htab->top_id = top_id; 10513 amt = sizeof (struct map_stub) * (top_id + 1); 10514 htab->stub_group = bfd_zmalloc (amt); 10515 if (htab->stub_group == NULL) 10516 return -1; 10517 10518 /* Set toc_off for com, und, abs and ind sections. */ 10519 for (id = 0; id < 3; id++) 10520 htab->stub_group[id].toc_off = TOC_BASE_OFF; 10521 10522 /* We can't use output_bfd->section_count here to find the top output 10523 section index as some sections may have been removed, and 10524 strip_excluded_output_sections doesn't renumber the indices. */ 10525 for (section = info->output_bfd->sections, top_index = 0; 10526 section != NULL; 10527 section = section->next) 10528 { 10529 if (top_index < section->index) 10530 top_index = section->index; 10531 } 10532 10533 htab->top_index = top_index; 10534 amt = sizeof (asection *) * (top_index + 1); 10535 input_list = bfd_zmalloc (amt); 10536 htab->input_list = input_list; 10537 if (input_list == NULL) 10538 return -1; 10539 10540 return 1; 10541 } 10542 10543 /* Set up for first pass at multitoc partitioning. */ 10544 10545 void 10546 ppc64_elf_start_multitoc_partition (struct bfd_link_info *info) 10547 { 10548 struct ppc_link_hash_table *htab = ppc_hash_table (info); 10549 10550 elf_gp (info->output_bfd) = ppc64_elf_toc (info->output_bfd); 10551 htab->toc_curr = elf_gp (info->output_bfd); 10552 htab->toc_bfd = NULL; 10553 htab->toc_first_sec = NULL; 10554 } 10555 10556 /* The linker repeatedly calls this function for each TOC input section 10557 and linker generated GOT section. Group input bfds such that the toc 10558 within a group is less than 64k in size. */ 10559 10560 bfd_boolean 10561 ppc64_elf_next_toc_section (struct bfd_link_info *info, asection *isec) 10562 { 10563 struct ppc_link_hash_table *htab = ppc_hash_table (info); 10564 bfd_vma addr, off, limit; 10565 10566 if (htab == NULL) 10567 return FALSE; 10568 10569 if (!htab->second_toc_pass) 10570 { 10571 /* Keep track of the first .toc or .got section for this input bfd. */ 10572 bfd_boolean new_bfd = htab->toc_bfd != isec->owner; 10573 10574 if (new_bfd) 10575 { 10576 htab->toc_bfd = isec->owner; 10577 htab->toc_first_sec = isec; 10578 } 10579 10580 addr = isec->output_offset + isec->output_section->vma; 10581 off = addr - htab->toc_curr; 10582 limit = 0x80008000; 10583 if (ppc64_elf_tdata (isec->owner)->has_small_toc_reloc) 10584 limit = 0x10000; 10585 if (off + isec->size > limit) 10586 { 10587 addr = (htab->toc_first_sec->output_offset 10588 + htab->toc_first_sec->output_section->vma); 10589 htab->toc_curr = addr; 10590 } 10591 10592 /* toc_curr is the base address of this toc group. Set elf_gp 10593 for the input section to be the offset relative to the 10594 output toc base plus 0x8000. Making the input elf_gp an 10595 offset allows us to move the toc as a whole without 10596 recalculating input elf_gp. */ 10597 off = htab->toc_curr - elf_gp (isec->output_section->owner); 10598 off += TOC_BASE_OFF; 10599 10600 /* Die if someone uses a linker script that doesn't keep input 10601 file .toc and .got together. */ 10602 if (new_bfd 10603 && elf_gp (isec->owner) != 0 10604 && elf_gp (isec->owner) != off) 10605 return FALSE; 10606 10607 elf_gp (isec->owner) = off; 10608 return TRUE; 10609 } 10610 10611 /* During the second pass toc_first_sec points to the start of 10612 a toc group, and toc_curr is used to track the old elf_gp. 10613 We use toc_bfd to ensure we only look at each bfd once. */ 10614 if (htab->toc_bfd == isec->owner) 10615 return TRUE; 10616 htab->toc_bfd = isec->owner; 10617 10618 if (htab->toc_first_sec == NULL 10619 || htab->toc_curr != elf_gp (isec->owner)) 10620 { 10621 htab->toc_curr = elf_gp (isec->owner); 10622 htab->toc_first_sec = isec; 10623 } 10624 addr = (htab->toc_first_sec->output_offset 10625 + htab->toc_first_sec->output_section->vma); 10626 off = addr - elf_gp (isec->output_section->owner) + TOC_BASE_OFF; 10627 elf_gp (isec->owner) = off; 10628 10629 return TRUE; 10630 } 10631 10632 /* Called via elf_link_hash_traverse to merge GOT entries for global 10633 symbol H. */ 10634 10635 static bfd_boolean 10636 merge_global_got (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) 10637 { 10638 if (h->root.type == bfd_link_hash_indirect) 10639 return TRUE; 10640 10641 merge_got_entries (&h->got.glist); 10642 10643 return TRUE; 10644 } 10645 10646 /* Called via elf_link_hash_traverse to allocate GOT entries for global 10647 symbol H. */ 10648 10649 static bfd_boolean 10650 reallocate_got (struct elf_link_hash_entry *h, void *inf) 10651 { 10652 struct got_entry *gent; 10653 10654 if (h->root.type == bfd_link_hash_indirect) 10655 return TRUE; 10656 10657 for (gent = h->got.glist; gent != NULL; gent = gent->next) 10658 if (!gent->is_indirect) 10659 allocate_got (h, (struct bfd_link_info *) inf, gent); 10660 return TRUE; 10661 } 10662 10663 /* Called on the first multitoc pass after the last call to 10664 ppc64_elf_next_toc_section. This function removes duplicate GOT 10665 entries. */ 10666 10667 bfd_boolean 10668 ppc64_elf_layout_multitoc (struct bfd_link_info *info) 10669 { 10670 struct ppc_link_hash_table *htab = ppc_hash_table (info); 10671 struct bfd *ibfd, *ibfd2; 10672 bfd_boolean done_something; 10673 10674 htab->multi_toc_needed = htab->toc_curr != elf_gp (info->output_bfd); 10675 10676 if (!htab->do_multi_toc) 10677 return FALSE; 10678 10679 /* Merge global sym got entries within a toc group. */ 10680 elf_link_hash_traverse (&htab->elf, merge_global_got, info); 10681 10682 /* And tlsld_got. */ 10683 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 10684 { 10685 struct got_entry *ent, *ent2; 10686 10687 if (!is_ppc64_elf (ibfd)) 10688 continue; 10689 10690 ent = ppc64_tlsld_got (ibfd); 10691 if (!ent->is_indirect 10692 && ent->got.offset != (bfd_vma) -1) 10693 { 10694 for (ibfd2 = ibfd->link_next; ibfd2 != NULL; ibfd2 = ibfd2->link_next) 10695 { 10696 if (!is_ppc64_elf (ibfd2)) 10697 continue; 10698 10699 ent2 = ppc64_tlsld_got (ibfd2); 10700 if (!ent2->is_indirect 10701 && ent2->got.offset != (bfd_vma) -1 10702 && elf_gp (ibfd2) == elf_gp (ibfd)) 10703 { 10704 ent2->is_indirect = TRUE; 10705 ent2->got.ent = ent; 10706 } 10707 } 10708 } 10709 } 10710 10711 /* Zap sizes of got sections. */ 10712 htab->reliplt->rawsize = htab->reliplt->size; 10713 htab->reliplt->size -= htab->got_reli_size; 10714 htab->got_reli_size = 0; 10715 10716 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 10717 { 10718 asection *got, *relgot; 10719 10720 if (!is_ppc64_elf (ibfd)) 10721 continue; 10722 10723 got = ppc64_elf_tdata (ibfd)->got; 10724 if (got != NULL) 10725 { 10726 got->rawsize = got->size; 10727 got->size = 0; 10728 relgot = ppc64_elf_tdata (ibfd)->relgot; 10729 relgot->rawsize = relgot->size; 10730 relgot->size = 0; 10731 } 10732 } 10733 10734 /* Now reallocate the got, local syms first. We don't need to 10735 allocate section contents again since we never increase size. */ 10736 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 10737 { 10738 struct got_entry **lgot_ents; 10739 struct got_entry **end_lgot_ents; 10740 struct plt_entry **local_plt; 10741 struct plt_entry **end_local_plt; 10742 unsigned char *lgot_masks; 10743 bfd_size_type locsymcount; 10744 Elf_Internal_Shdr *symtab_hdr; 10745 asection *s, *srel; 10746 10747 if (!is_ppc64_elf (ibfd)) 10748 continue; 10749 10750 lgot_ents = elf_local_got_ents (ibfd); 10751 if (!lgot_ents) 10752 continue; 10753 10754 symtab_hdr = &elf_symtab_hdr (ibfd); 10755 locsymcount = symtab_hdr->sh_info; 10756 end_lgot_ents = lgot_ents + locsymcount; 10757 local_plt = (struct plt_entry **) end_lgot_ents; 10758 end_local_plt = local_plt + locsymcount; 10759 lgot_masks = (unsigned char *) end_local_plt; 10760 s = ppc64_elf_tdata (ibfd)->got; 10761 srel = ppc64_elf_tdata (ibfd)->relgot; 10762 for (; lgot_ents < end_lgot_ents; ++lgot_ents, ++lgot_masks) 10763 { 10764 struct got_entry *ent; 10765 10766 for (ent = *lgot_ents; ent != NULL; ent = ent->next) 10767 { 10768 unsigned int num = 1; 10769 ent->got.offset = s->size; 10770 if ((ent->tls_type & *lgot_masks & TLS_GD) != 0) 10771 num = 2; 10772 s->size += num * 8; 10773 if (info->shared) 10774 srel->size += num * sizeof (Elf64_External_Rela); 10775 else if ((*lgot_masks & PLT_IFUNC) != 0) 10776 { 10777 htab->reliplt->size 10778 += num * sizeof (Elf64_External_Rela); 10779 htab->got_reli_size 10780 += num * sizeof (Elf64_External_Rela); 10781 } 10782 } 10783 } 10784 } 10785 10786 elf_link_hash_traverse (&htab->elf, reallocate_got, info); 10787 10788 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 10789 { 10790 struct got_entry *ent; 10791 10792 if (!is_ppc64_elf (ibfd)) 10793 continue; 10794 10795 ent = ppc64_tlsld_got (ibfd); 10796 if (!ent->is_indirect 10797 && ent->got.offset != (bfd_vma) -1) 10798 { 10799 asection *s = ppc64_elf_tdata (ibfd)->got; 10800 ent->got.offset = s->size; 10801 s->size += 16; 10802 if (info->shared) 10803 { 10804 asection *srel = ppc64_elf_tdata (ibfd)->relgot; 10805 srel->size += sizeof (Elf64_External_Rela); 10806 } 10807 } 10808 } 10809 10810 done_something = htab->reliplt->rawsize != htab->reliplt->size; 10811 if (!done_something) 10812 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 10813 { 10814 asection *got; 10815 10816 if (!is_ppc64_elf (ibfd)) 10817 continue; 10818 10819 got = ppc64_elf_tdata (ibfd)->got; 10820 if (got != NULL) 10821 { 10822 done_something = got->rawsize != got->size; 10823 if (done_something) 10824 break; 10825 } 10826 } 10827 10828 if (done_something) 10829 (*htab->layout_sections_again) (); 10830 10831 /* Set up for second pass over toc sections to recalculate elf_gp 10832 on input sections. */ 10833 htab->toc_bfd = NULL; 10834 htab->toc_first_sec = NULL; 10835 htab->second_toc_pass = TRUE; 10836 return done_something; 10837 } 10838 10839 /* Called after second pass of multitoc partitioning. */ 10840 10841 void 10842 ppc64_elf_finish_multitoc_partition (struct bfd_link_info *info) 10843 { 10844 struct ppc_link_hash_table *htab = ppc_hash_table (info); 10845 10846 /* After the second pass, toc_curr tracks the TOC offset used 10847 for code sections below in ppc64_elf_next_input_section. */ 10848 htab->toc_curr = TOC_BASE_OFF; 10849 } 10850 10851 /* No toc references were found in ISEC. If the code in ISEC makes no 10852 calls, then there's no need to use toc adjusting stubs when branching 10853 into ISEC. Actually, indirect calls from ISEC are OK as they will 10854 load r2. Returns -1 on error, 0 for no stub needed, 1 for stub 10855 needed, and 2 if a cyclical call-graph was found but no other reason 10856 for a stub was detected. If called from the top level, a return of 10857 2 means the same as a return of 0. */ 10858 10859 static int 10860 toc_adjusting_stub_needed (struct bfd_link_info *info, asection *isec) 10861 { 10862 int ret; 10863 10864 /* Mark this section as checked. */ 10865 isec->call_check_done = 1; 10866 10867 /* We know none of our code bearing sections will need toc stubs. */ 10868 if ((isec->flags & SEC_LINKER_CREATED) != 0) 10869 return 0; 10870 10871 if (isec->size == 0) 10872 return 0; 10873 10874 if (isec->output_section == NULL) 10875 return 0; 10876 10877 ret = 0; 10878 if (isec->reloc_count != 0) 10879 { 10880 Elf_Internal_Rela *relstart, *rel; 10881 Elf_Internal_Sym *local_syms; 10882 struct ppc_link_hash_table *htab; 10883 10884 relstart = _bfd_elf_link_read_relocs (isec->owner, isec, NULL, NULL, 10885 info->keep_memory); 10886 if (relstart == NULL) 10887 return -1; 10888 10889 /* Look for branches to outside of this section. */ 10890 local_syms = NULL; 10891 htab = ppc_hash_table (info); 10892 if (htab == NULL) 10893 return -1; 10894 10895 for (rel = relstart; rel < relstart + isec->reloc_count; ++rel) 10896 { 10897 enum elf_ppc64_reloc_type r_type; 10898 unsigned long r_symndx; 10899 struct elf_link_hash_entry *h; 10900 struct ppc_link_hash_entry *eh; 10901 Elf_Internal_Sym *sym; 10902 asection *sym_sec; 10903 struct _opd_sec_data *opd; 10904 bfd_vma sym_value; 10905 bfd_vma dest; 10906 10907 r_type = ELF64_R_TYPE (rel->r_info); 10908 if (r_type != R_PPC64_REL24 10909 && r_type != R_PPC64_REL14 10910 && r_type != R_PPC64_REL14_BRTAKEN 10911 && r_type != R_PPC64_REL14_BRNTAKEN) 10912 continue; 10913 10914 r_symndx = ELF64_R_SYM (rel->r_info); 10915 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, r_symndx, 10916 isec->owner)) 10917 { 10918 ret = -1; 10919 break; 10920 } 10921 10922 /* Calls to dynamic lib functions go through a plt call stub 10923 that uses r2. */ 10924 eh = (struct ppc_link_hash_entry *) h; 10925 if (eh != NULL 10926 && (eh->elf.plt.plist != NULL 10927 || (eh->oh != NULL 10928 && ppc_follow_link (eh->oh)->elf.plt.plist != NULL))) 10929 { 10930 ret = 1; 10931 break; 10932 } 10933 10934 if (sym_sec == NULL) 10935 /* Ignore other undefined symbols. */ 10936 continue; 10937 10938 /* Assume branches to other sections not included in the 10939 link need stubs too, to cover -R and absolute syms. */ 10940 if (sym_sec->output_section == NULL) 10941 { 10942 ret = 1; 10943 break; 10944 } 10945 10946 if (h == NULL) 10947 sym_value = sym->st_value; 10948 else 10949 { 10950 if (h->root.type != bfd_link_hash_defined 10951 && h->root.type != bfd_link_hash_defweak) 10952 abort (); 10953 sym_value = h->root.u.def.value; 10954 } 10955 sym_value += rel->r_addend; 10956 10957 /* If this branch reloc uses an opd sym, find the code section. */ 10958 opd = get_opd_info (sym_sec); 10959 if (opd != NULL) 10960 { 10961 if (h == NULL && opd->adjust != NULL) 10962 { 10963 long adjust; 10964 10965 adjust = opd->adjust[sym->st_value / 8]; 10966 if (adjust == -1) 10967 /* Assume deleted functions won't ever be called. */ 10968 continue; 10969 sym_value += adjust; 10970 } 10971 10972 dest = opd_entry_value (sym_sec, sym_value, 10973 &sym_sec, NULL, FALSE); 10974 if (dest == (bfd_vma) -1) 10975 continue; 10976 } 10977 else 10978 dest = (sym_value 10979 + sym_sec->output_offset 10980 + sym_sec->output_section->vma); 10981 10982 /* Ignore branch to self. */ 10983 if (sym_sec == isec) 10984 continue; 10985 10986 /* If the called function uses the toc, we need a stub. */ 10987 if (sym_sec->has_toc_reloc 10988 || sym_sec->makes_toc_func_call) 10989 { 10990 ret = 1; 10991 break; 10992 } 10993 10994 /* Assume any branch that needs a long branch stub might in fact 10995 need a plt_branch stub. A plt_branch stub uses r2. */ 10996 else if (dest - (isec->output_offset 10997 + isec->output_section->vma 10998 + rel->r_offset) + (1 << 25) >= (2 << 25)) 10999 { 11000 ret = 1; 11001 break; 11002 } 11003 11004 /* If calling back to a section in the process of being 11005 tested, we can't say for sure that no toc adjusting stubs 11006 are needed, so don't return zero. */ 11007 else if (sym_sec->call_check_in_progress) 11008 ret = 2; 11009 11010 /* Branches to another section that itself doesn't have any TOC 11011 references are OK. Recursively call ourselves to check. */ 11012 else if (!sym_sec->call_check_done) 11013 { 11014 int recur; 11015 11016 /* Mark current section as indeterminate, so that other 11017 sections that call back to current won't be marked as 11018 known. */ 11019 isec->call_check_in_progress = 1; 11020 recur = toc_adjusting_stub_needed (info, sym_sec); 11021 isec->call_check_in_progress = 0; 11022 11023 if (recur != 0) 11024 { 11025 ret = recur; 11026 if (recur != 2) 11027 break; 11028 } 11029 } 11030 } 11031 11032 if (local_syms != NULL 11033 && (elf_symtab_hdr (isec->owner).contents 11034 != (unsigned char *) local_syms)) 11035 free (local_syms); 11036 if (elf_section_data (isec)->relocs != relstart) 11037 free (relstart); 11038 } 11039 11040 if ((ret & 1) == 0 11041 && isec->map_head.s != NULL 11042 && (strcmp (isec->output_section->name, ".init") == 0 11043 || strcmp (isec->output_section->name, ".fini") == 0)) 11044 { 11045 if (isec->map_head.s->has_toc_reloc 11046 || isec->map_head.s->makes_toc_func_call) 11047 ret = 1; 11048 else if (!isec->map_head.s->call_check_done) 11049 { 11050 int recur; 11051 isec->call_check_in_progress = 1; 11052 recur = toc_adjusting_stub_needed (info, isec->map_head.s); 11053 isec->call_check_in_progress = 0; 11054 if (recur != 0) 11055 ret = recur; 11056 } 11057 } 11058 11059 if (ret == 1) 11060 isec->makes_toc_func_call = 1; 11061 11062 return ret; 11063 } 11064 11065 /* The linker repeatedly calls this function for each input section, 11066 in the order that input sections are linked into output sections. 11067 Build lists of input sections to determine groupings between which 11068 we may insert linker stubs. */ 11069 11070 bfd_boolean 11071 ppc64_elf_next_input_section (struct bfd_link_info *info, asection *isec) 11072 { 11073 struct ppc_link_hash_table *htab = ppc_hash_table (info); 11074 11075 if (htab == NULL) 11076 return FALSE; 11077 11078 if ((isec->output_section->flags & SEC_CODE) != 0 11079 && isec->output_section->index <= htab->top_index) 11080 { 11081 asection **list = htab->input_list + isec->output_section->index; 11082 /* Steal the link_sec pointer for our list. */ 11083 #define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec) 11084 /* This happens to make the list in reverse order, 11085 which is what we want. */ 11086 PREV_SEC (isec) = *list; 11087 *list = isec; 11088 } 11089 11090 if (htab->multi_toc_needed) 11091 { 11092 /* If a code section has a function that uses the TOC then we need 11093 to use the right TOC (obviously). Also, make sure that .opd gets 11094 the correct TOC value for R_PPC64_TOC relocs that don't have or 11095 can't find their function symbol (shouldn't ever happen now). 11096 Also specially treat .fixup for the linux kernel. .fixup 11097 contains branches, but only back to the function that hit an 11098 exception. */ 11099 if (isec->has_toc_reloc 11100 || (isec->flags & SEC_CODE) == 0 11101 || strcmp (isec->name, ".fixup") == 0) 11102 { 11103 if (elf_gp (isec->owner) != 0) 11104 htab->toc_curr = elf_gp (isec->owner); 11105 } 11106 else 11107 { 11108 if (!isec->call_check_done 11109 && toc_adjusting_stub_needed (info, isec) < 0) 11110 return FALSE; 11111 /* If we make a local call from this section, ie. a branch 11112 without a following nop, then we have no place to put a 11113 toc restoring insn. We must use the same toc group as 11114 the callee. 11115 Testing makes_toc_func_call actually tests for *any* 11116 calls to functions that need a good toc pointer. A more 11117 precise test would be better, as this one will set 11118 incorrect values for pasted .init/.fini fragments. 11119 (Fixed later in check_pasted_section.) */ 11120 if (isec->makes_toc_func_call 11121 && elf_gp (isec->owner) != 0) 11122 htab->toc_curr = elf_gp (isec->owner); 11123 } 11124 } 11125 11126 /* Functions that don't use the TOC can belong in any TOC group. 11127 Use the last TOC base. */ 11128 htab->stub_group[isec->id].toc_off = htab->toc_curr; 11129 return TRUE; 11130 } 11131 11132 /* Check that all .init and .fini sections use the same toc, if they 11133 have toc relocs. */ 11134 11135 static bfd_boolean 11136 check_pasted_section (struct bfd_link_info *info, const char *name) 11137 { 11138 asection *o = bfd_get_section_by_name (info->output_bfd, name); 11139 11140 if (o != NULL) 11141 { 11142 struct ppc_link_hash_table *htab = ppc_hash_table (info); 11143 bfd_vma toc_off = 0; 11144 asection *i; 11145 11146 for (i = o->map_head.s; i != NULL; i = i->map_head.s) 11147 if (i->has_toc_reloc) 11148 { 11149 if (toc_off == 0) 11150 toc_off = htab->stub_group[i->id].toc_off; 11151 else if (toc_off != htab->stub_group[i->id].toc_off) 11152 return FALSE; 11153 } 11154 11155 if (toc_off == 0) 11156 for (i = o->map_head.s; i != NULL; i = i->map_head.s) 11157 if (i->makes_toc_func_call) 11158 { 11159 toc_off = htab->stub_group[i->id].toc_off; 11160 break; 11161 } 11162 11163 /* Make sure the whole pasted function uses the same toc offset. */ 11164 if (toc_off != 0) 11165 for (i = o->map_head.s; i != NULL; i = i->map_head.s) 11166 htab->stub_group[i->id].toc_off = toc_off; 11167 } 11168 return TRUE; 11169 } 11170 11171 bfd_boolean 11172 ppc64_elf_check_init_fini (struct bfd_link_info *info) 11173 { 11174 return (check_pasted_section (info, ".init") 11175 & check_pasted_section (info, ".fini")); 11176 } 11177 11178 /* See whether we can group stub sections together. Grouping stub 11179 sections may result in fewer stubs. More importantly, we need to 11180 put all .init* and .fini* stubs at the beginning of the .init or 11181 .fini output sections respectively, because glibc splits the 11182 _init and _fini functions into multiple parts. Putting a stub in 11183 the middle of a function is not a good idea. */ 11184 11185 static void 11186 group_sections (struct ppc_link_hash_table *htab, 11187 bfd_size_type stub_group_size, 11188 bfd_boolean stubs_always_before_branch) 11189 { 11190 asection **list; 11191 bfd_size_type stub14_group_size; 11192 bfd_boolean suppress_size_errors; 11193 11194 suppress_size_errors = FALSE; 11195 stub14_group_size = stub_group_size; 11196 if (stub_group_size == 1) 11197 { 11198 /* Default values. */ 11199 if (stubs_always_before_branch) 11200 { 11201 stub_group_size = 0x1e00000; 11202 stub14_group_size = 0x7800; 11203 } 11204 else 11205 { 11206 stub_group_size = 0x1c00000; 11207 stub14_group_size = 0x7000; 11208 } 11209 suppress_size_errors = TRUE; 11210 } 11211 11212 list = htab->input_list + htab->top_index; 11213 do 11214 { 11215 asection *tail = *list; 11216 while (tail != NULL) 11217 { 11218 asection *curr; 11219 asection *prev; 11220 bfd_size_type total; 11221 bfd_boolean big_sec; 11222 bfd_vma curr_toc; 11223 11224 curr = tail; 11225 total = tail->size; 11226 big_sec = total > (ppc64_elf_section_data (tail) != NULL 11227 && ppc64_elf_section_data (tail)->has_14bit_branch 11228 ? stub14_group_size : stub_group_size); 11229 if (big_sec && !suppress_size_errors) 11230 (*_bfd_error_handler) (_("%B section %A exceeds stub group size"), 11231 tail->owner, tail); 11232 curr_toc = htab->stub_group[tail->id].toc_off; 11233 11234 while ((prev = PREV_SEC (curr)) != NULL 11235 && ((total += curr->output_offset - prev->output_offset) 11236 < (ppc64_elf_section_data (prev) != NULL 11237 && ppc64_elf_section_data (prev)->has_14bit_branch 11238 ? stub14_group_size : stub_group_size)) 11239 && htab->stub_group[prev->id].toc_off == curr_toc) 11240 curr = prev; 11241 11242 /* OK, the size from the start of CURR to the end is less 11243 than stub_group_size and thus can be handled by one stub 11244 section. (or the tail section is itself larger than 11245 stub_group_size, in which case we may be toast.) We 11246 should really be keeping track of the total size of stubs 11247 added here, as stubs contribute to the final output 11248 section size. That's a little tricky, and this way will 11249 only break if stubs added make the total size more than 11250 2^25, ie. for the default stub_group_size, if stubs total 11251 more than 2097152 bytes, or nearly 75000 plt call stubs. */ 11252 do 11253 { 11254 prev = PREV_SEC (tail); 11255 /* Set up this stub group. */ 11256 htab->stub_group[tail->id].link_sec = curr; 11257 } 11258 while (tail != curr && (tail = prev) != NULL); 11259 11260 /* But wait, there's more! Input sections up to stub_group_size 11261 bytes before the stub section can be handled by it too. 11262 Don't do this if we have a really large section after the 11263 stubs, as adding more stubs increases the chance that 11264 branches may not reach into the stub section. */ 11265 if (!stubs_always_before_branch && !big_sec) 11266 { 11267 total = 0; 11268 while (prev != NULL 11269 && ((total += tail->output_offset - prev->output_offset) 11270 < (ppc64_elf_section_data (prev) != NULL 11271 && ppc64_elf_section_data (prev)->has_14bit_branch 11272 ? stub14_group_size : stub_group_size)) 11273 && htab->stub_group[prev->id].toc_off == curr_toc) 11274 { 11275 tail = prev; 11276 prev = PREV_SEC (tail); 11277 htab->stub_group[tail->id].link_sec = curr; 11278 } 11279 } 11280 tail = prev; 11281 } 11282 } 11283 while (list-- != htab->input_list); 11284 free (htab->input_list); 11285 #undef PREV_SEC 11286 } 11287 11288 static const unsigned char glink_eh_frame_cie[] = 11289 { 11290 0, 0, 0, 16, /* length. */ 11291 0, 0, 0, 0, /* id. */ 11292 1, /* CIE version. */ 11293 'z', 'R', 0, /* Augmentation string. */ 11294 4, /* Code alignment. */ 11295 0x78, /* Data alignment. */ 11296 65, /* RA reg. */ 11297 1, /* Augmentation size. */ 11298 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding. */ 11299 DW_CFA_def_cfa, 1, 0 /* def_cfa: r1 offset 0. */ 11300 }; 11301 11302 /* Stripping output sections is normally done before dynamic section 11303 symbols have been allocated. This function is called later, and 11304 handles cases like htab->brlt which is mapped to its own output 11305 section. */ 11306 11307 static void 11308 maybe_strip_output (struct bfd_link_info *info, asection *isec) 11309 { 11310 if (isec->size == 0 11311 && isec->output_section->size == 0 11312 && !(isec->output_section->flags & SEC_KEEP) 11313 && !bfd_section_removed_from_list (info->output_bfd, 11314 isec->output_section) 11315 && elf_section_data (isec->output_section)->dynindx == 0) 11316 { 11317 isec->output_section->flags |= SEC_EXCLUDE; 11318 bfd_section_list_remove (info->output_bfd, isec->output_section); 11319 info->output_bfd->section_count--; 11320 } 11321 } 11322 11323 /* Determine and set the size of the stub section for a final link. 11324 11325 The basic idea here is to examine all the relocations looking for 11326 PC-relative calls to a target that is unreachable with a "bl" 11327 instruction. */ 11328 11329 bfd_boolean 11330 ppc64_elf_size_stubs (struct bfd_link_info *info, bfd_signed_vma group_size, 11331 bfd_boolean plt_static_chain, int plt_thread_safe, 11332 int plt_stub_align) 11333 { 11334 bfd_size_type stub_group_size; 11335 bfd_boolean stubs_always_before_branch; 11336 struct ppc_link_hash_table *htab = ppc_hash_table (info); 11337 11338 if (htab == NULL) 11339 return FALSE; 11340 11341 htab->plt_static_chain = plt_static_chain; 11342 htab->plt_stub_align = plt_stub_align; 11343 if (plt_thread_safe == -1 && !info->executable) 11344 plt_thread_safe = 1; 11345 if (plt_thread_safe == -1) 11346 { 11347 static const char *const thread_starter[] = 11348 { 11349 "pthread_create", 11350 /* libstdc++ */ 11351 "_ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEE", 11352 /* librt */ 11353 "aio_init", "aio_read", "aio_write", "aio_fsync", "lio_listio", 11354 "mq_notify", "create_timer", 11355 /* libanl */ 11356 "getaddrinfo_a", 11357 /* libgomp */ 11358 "GOMP_parallel_start", 11359 "GOMP_parallel_loop_static_start", 11360 "GOMP_parallel_loop_dynamic_start", 11361 "GOMP_parallel_loop_guided_start", 11362 "GOMP_parallel_loop_runtime_start", 11363 "GOMP_parallel_sections_start", 11364 }; 11365 unsigned i; 11366 11367 for (i = 0; i < sizeof (thread_starter)/ sizeof (thread_starter[0]); i++) 11368 { 11369 struct elf_link_hash_entry *h; 11370 h = elf_link_hash_lookup (&htab->elf, thread_starter[i], 11371 FALSE, FALSE, TRUE); 11372 plt_thread_safe = h != NULL && h->ref_regular; 11373 if (plt_thread_safe) 11374 break; 11375 } 11376 } 11377 htab->plt_thread_safe = plt_thread_safe; 11378 stubs_always_before_branch = group_size < 0; 11379 if (group_size < 0) 11380 stub_group_size = -group_size; 11381 else 11382 stub_group_size = group_size; 11383 11384 group_sections (htab, stub_group_size, stubs_always_before_branch); 11385 11386 while (1) 11387 { 11388 bfd *input_bfd; 11389 unsigned int bfd_indx; 11390 asection *stub_sec; 11391 11392 htab->stub_iteration += 1; 11393 11394 for (input_bfd = info->input_bfds, bfd_indx = 0; 11395 input_bfd != NULL; 11396 input_bfd = input_bfd->link_next, bfd_indx++) 11397 { 11398 Elf_Internal_Shdr *symtab_hdr; 11399 asection *section; 11400 Elf_Internal_Sym *local_syms = NULL; 11401 11402 if (!is_ppc64_elf (input_bfd)) 11403 continue; 11404 11405 /* We'll need the symbol table in a second. */ 11406 symtab_hdr = &elf_symtab_hdr (input_bfd); 11407 if (symtab_hdr->sh_info == 0) 11408 continue; 11409 11410 /* Walk over each section attached to the input bfd. */ 11411 for (section = input_bfd->sections; 11412 section != NULL; 11413 section = section->next) 11414 { 11415 Elf_Internal_Rela *internal_relocs, *irelaend, *irela; 11416 11417 /* If there aren't any relocs, then there's nothing more 11418 to do. */ 11419 if ((section->flags & SEC_RELOC) == 0 11420 || (section->flags & SEC_ALLOC) == 0 11421 || (section->flags & SEC_LOAD) == 0 11422 || (section->flags & SEC_CODE) == 0 11423 || section->reloc_count == 0) 11424 continue; 11425 11426 /* If this section is a link-once section that will be 11427 discarded, then don't create any stubs. */ 11428 if (section->output_section == NULL 11429 || section->output_section->owner != info->output_bfd) 11430 continue; 11431 11432 /* Get the relocs. */ 11433 internal_relocs 11434 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, 11435 info->keep_memory); 11436 if (internal_relocs == NULL) 11437 goto error_ret_free_local; 11438 11439 /* Now examine each relocation. */ 11440 irela = internal_relocs; 11441 irelaend = irela + section->reloc_count; 11442 for (; irela < irelaend; irela++) 11443 { 11444 enum elf_ppc64_reloc_type r_type; 11445 unsigned int r_indx; 11446 enum ppc_stub_type stub_type; 11447 struct ppc_stub_hash_entry *stub_entry; 11448 asection *sym_sec, *code_sec; 11449 bfd_vma sym_value, code_value; 11450 bfd_vma destination; 11451 bfd_boolean ok_dest; 11452 struct ppc_link_hash_entry *hash; 11453 struct ppc_link_hash_entry *fdh; 11454 struct elf_link_hash_entry *h; 11455 Elf_Internal_Sym *sym; 11456 char *stub_name; 11457 const asection *id_sec; 11458 struct _opd_sec_data *opd; 11459 struct plt_entry *plt_ent; 11460 11461 r_type = ELF64_R_TYPE (irela->r_info); 11462 r_indx = ELF64_R_SYM (irela->r_info); 11463 11464 if (r_type >= R_PPC64_max) 11465 { 11466 bfd_set_error (bfd_error_bad_value); 11467 goto error_ret_free_internal; 11468 } 11469 11470 /* Only look for stubs on branch instructions. */ 11471 if (r_type != R_PPC64_REL24 11472 && r_type != R_PPC64_REL14 11473 && r_type != R_PPC64_REL14_BRTAKEN 11474 && r_type != R_PPC64_REL14_BRNTAKEN) 11475 continue; 11476 11477 /* Now determine the call target, its name, value, 11478 section. */ 11479 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 11480 r_indx, input_bfd)) 11481 goto error_ret_free_internal; 11482 hash = (struct ppc_link_hash_entry *) h; 11483 11484 ok_dest = FALSE; 11485 fdh = NULL; 11486 sym_value = 0; 11487 if (hash == NULL) 11488 { 11489 sym_value = sym->st_value; 11490 ok_dest = TRUE; 11491 } 11492 else if (hash->elf.root.type == bfd_link_hash_defined 11493 || hash->elf.root.type == bfd_link_hash_defweak) 11494 { 11495 sym_value = hash->elf.root.u.def.value; 11496 if (sym_sec->output_section != NULL) 11497 ok_dest = TRUE; 11498 } 11499 else if (hash->elf.root.type == bfd_link_hash_undefweak 11500 || hash->elf.root.type == bfd_link_hash_undefined) 11501 { 11502 /* Recognise an old ABI func code entry sym, and 11503 use the func descriptor sym instead if it is 11504 defined. */ 11505 if (hash->elf.root.root.string[0] == '.' 11506 && (fdh = lookup_fdh (hash, htab)) != NULL) 11507 { 11508 if (fdh->elf.root.type == bfd_link_hash_defined 11509 || fdh->elf.root.type == bfd_link_hash_defweak) 11510 { 11511 sym_sec = fdh->elf.root.u.def.section; 11512 sym_value = fdh->elf.root.u.def.value; 11513 if (sym_sec->output_section != NULL) 11514 ok_dest = TRUE; 11515 } 11516 else 11517 fdh = NULL; 11518 } 11519 } 11520 else 11521 { 11522 bfd_set_error (bfd_error_bad_value); 11523 goto error_ret_free_internal; 11524 } 11525 11526 destination = 0; 11527 if (ok_dest) 11528 { 11529 sym_value += irela->r_addend; 11530 destination = (sym_value 11531 + sym_sec->output_offset 11532 + sym_sec->output_section->vma); 11533 } 11534 11535 code_sec = sym_sec; 11536 code_value = sym_value; 11537 opd = get_opd_info (sym_sec); 11538 if (opd != NULL) 11539 { 11540 bfd_vma dest; 11541 11542 if (hash == NULL && opd->adjust != NULL) 11543 { 11544 long adjust = opd->adjust[sym_value / 8]; 11545 if (adjust == -1) 11546 continue; 11547 code_value += adjust; 11548 sym_value += adjust; 11549 } 11550 dest = opd_entry_value (sym_sec, sym_value, 11551 &code_sec, &code_value, FALSE); 11552 if (dest != (bfd_vma) -1) 11553 { 11554 destination = dest; 11555 if (fdh != NULL) 11556 { 11557 /* Fixup old ABI sym to point at code 11558 entry. */ 11559 hash->elf.root.type = bfd_link_hash_defweak; 11560 hash->elf.root.u.def.section = code_sec; 11561 hash->elf.root.u.def.value = code_value; 11562 } 11563 } 11564 } 11565 11566 /* Determine what (if any) linker stub is needed. */ 11567 plt_ent = NULL; 11568 stub_type = ppc_type_of_stub (section, irela, &hash, 11569 &plt_ent, destination); 11570 11571 if (stub_type != ppc_stub_plt_call) 11572 { 11573 /* Check whether we need a TOC adjusting stub. 11574 Since the linker pastes together pieces from 11575 different object files when creating the 11576 _init and _fini functions, it may be that a 11577 call to what looks like a local sym is in 11578 fact a call needing a TOC adjustment. */ 11579 if (code_sec != NULL 11580 && code_sec->output_section != NULL 11581 && (htab->stub_group[code_sec->id].toc_off 11582 != htab->stub_group[section->id].toc_off) 11583 && (code_sec->has_toc_reloc 11584 || code_sec->makes_toc_func_call)) 11585 stub_type = ppc_stub_long_branch_r2off; 11586 } 11587 11588 if (stub_type == ppc_stub_none) 11589 continue; 11590 11591 /* __tls_get_addr calls might be eliminated. */ 11592 if (stub_type != ppc_stub_plt_call 11593 && hash != NULL 11594 && (hash == htab->tls_get_addr 11595 || hash == htab->tls_get_addr_fd) 11596 && section->has_tls_reloc 11597 && irela != internal_relocs) 11598 { 11599 /* Get tls info. */ 11600 unsigned char *tls_mask; 11601 11602 if (!get_tls_mask (&tls_mask, NULL, NULL, &local_syms, 11603 irela - 1, input_bfd)) 11604 goto error_ret_free_internal; 11605 if (*tls_mask != 0) 11606 continue; 11607 } 11608 11609 if (stub_type == ppc_stub_plt_call 11610 && irela + 1 < irelaend 11611 && irela[1].r_offset == irela->r_offset + 4 11612 && ELF64_R_TYPE (irela[1].r_info) == R_PPC64_TOCSAVE) 11613 { 11614 if (!tocsave_find (htab, INSERT, 11615 &local_syms, irela + 1, input_bfd)) 11616 goto error_ret_free_internal; 11617 } 11618 else if (stub_type == ppc_stub_plt_call) 11619 stub_type = ppc_stub_plt_call_r2save; 11620 11621 /* Support for grouping stub sections. */ 11622 id_sec = htab->stub_group[section->id].link_sec; 11623 11624 /* Get the name of this stub. */ 11625 stub_name = ppc_stub_name (id_sec, sym_sec, hash, irela); 11626 if (!stub_name) 11627 goto error_ret_free_internal; 11628 11629 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, 11630 stub_name, FALSE, FALSE); 11631 if (stub_entry != NULL) 11632 { 11633 /* The proper stub has already been created. */ 11634 free (stub_name); 11635 if (stub_type == ppc_stub_plt_call_r2save) 11636 stub_entry->stub_type = stub_type; 11637 continue; 11638 } 11639 11640 stub_entry = ppc_add_stub (stub_name, section, info); 11641 if (stub_entry == NULL) 11642 { 11643 free (stub_name); 11644 error_ret_free_internal: 11645 if (elf_section_data (section)->relocs == NULL) 11646 free (internal_relocs); 11647 error_ret_free_local: 11648 if (local_syms != NULL 11649 && (symtab_hdr->contents 11650 != (unsigned char *) local_syms)) 11651 free (local_syms); 11652 return FALSE; 11653 } 11654 11655 stub_entry->stub_type = stub_type; 11656 if (stub_type != ppc_stub_plt_call 11657 && stub_type != ppc_stub_plt_call_r2save) 11658 { 11659 stub_entry->target_value = code_value; 11660 stub_entry->target_section = code_sec; 11661 } 11662 else 11663 { 11664 stub_entry->target_value = sym_value; 11665 stub_entry->target_section = sym_sec; 11666 } 11667 stub_entry->h = hash; 11668 stub_entry->plt_ent = plt_ent; 11669 11670 if (stub_entry->h != NULL) 11671 htab->stub_globals += 1; 11672 } 11673 11674 /* We're done with the internal relocs, free them. */ 11675 if (elf_section_data (section)->relocs != internal_relocs) 11676 free (internal_relocs); 11677 } 11678 11679 if (local_syms != NULL 11680 && symtab_hdr->contents != (unsigned char *) local_syms) 11681 { 11682 if (!info->keep_memory) 11683 free (local_syms); 11684 else 11685 symtab_hdr->contents = (unsigned char *) local_syms; 11686 } 11687 } 11688 11689 /* We may have added some stubs. Find out the new size of the 11690 stub sections. */ 11691 for (stub_sec = htab->stub_bfd->sections; 11692 stub_sec != NULL; 11693 stub_sec = stub_sec->next) 11694 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 11695 { 11696 stub_sec->rawsize = stub_sec->size; 11697 stub_sec->size = 0; 11698 stub_sec->reloc_count = 0; 11699 stub_sec->flags &= ~SEC_RELOC; 11700 } 11701 11702 htab->brlt->size = 0; 11703 htab->brlt->reloc_count = 0; 11704 htab->brlt->flags &= ~SEC_RELOC; 11705 if (htab->relbrlt != NULL) 11706 htab->relbrlt->size = 0; 11707 11708 bfd_hash_traverse (&htab->stub_hash_table, ppc_size_one_stub, info); 11709 11710 if (info->emitrelocations 11711 && htab->glink != NULL && htab->glink->size != 0) 11712 { 11713 htab->glink->reloc_count = 1; 11714 htab->glink->flags |= SEC_RELOC; 11715 } 11716 11717 if (htab->glink_eh_frame != NULL 11718 && !bfd_is_abs_section (htab->glink_eh_frame->output_section) 11719 && htab->glink_eh_frame->output_section->size != 0) 11720 { 11721 size_t size = 0, align; 11722 11723 for (stub_sec = htab->stub_bfd->sections; 11724 stub_sec != NULL; 11725 stub_sec = stub_sec->next) 11726 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 11727 size += 20; 11728 if (htab->glink != NULL && htab->glink->size != 0) 11729 size += 24; 11730 if (size != 0) 11731 size += sizeof (glink_eh_frame_cie); 11732 align = 1; 11733 align <<= htab->glink_eh_frame->output_section->alignment_power; 11734 align -= 1; 11735 size = (size + align) & ~align; 11736 htab->glink_eh_frame->rawsize = htab->glink_eh_frame->size; 11737 htab->glink_eh_frame->size = size; 11738 } 11739 11740 if (htab->plt_stub_align != 0) 11741 for (stub_sec = htab->stub_bfd->sections; 11742 stub_sec != NULL; 11743 stub_sec = stub_sec->next) 11744 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 11745 stub_sec->size = ((stub_sec->size + (1 << htab->plt_stub_align) - 1) 11746 & (-1 << htab->plt_stub_align)); 11747 11748 for (stub_sec = htab->stub_bfd->sections; 11749 stub_sec != NULL; 11750 stub_sec = stub_sec->next) 11751 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0 11752 && stub_sec->rawsize != stub_sec->size) 11753 break; 11754 11755 /* Exit from this loop when no stubs have been added, and no stubs 11756 have changed size. */ 11757 if (stub_sec == NULL 11758 && (htab->glink_eh_frame == NULL 11759 || htab->glink_eh_frame->rawsize == htab->glink_eh_frame->size)) 11760 break; 11761 11762 /* Ask the linker to do its stuff. */ 11763 (*htab->layout_sections_again) (); 11764 } 11765 11766 maybe_strip_output (info, htab->brlt); 11767 if (htab->glink_eh_frame != NULL) 11768 maybe_strip_output (info, htab->glink_eh_frame); 11769 11770 return TRUE; 11771 } 11772 11773 /* Called after we have determined section placement. If sections 11774 move, we'll be called again. Provide a value for TOCstart. */ 11775 11776 bfd_vma 11777 ppc64_elf_toc (bfd *obfd) 11778 { 11779 asection *s; 11780 bfd_vma TOCstart; 11781 11782 /* The TOC consists of sections .got, .toc, .tocbss, .plt in that 11783 order. The TOC starts where the first of these sections starts. */ 11784 s = bfd_get_section_by_name (obfd, ".got"); 11785 if (s == NULL || (s->flags & SEC_EXCLUDE) != 0) 11786 s = bfd_get_section_by_name (obfd, ".toc"); 11787 if (s == NULL || (s->flags & SEC_EXCLUDE) != 0) 11788 s = bfd_get_section_by_name (obfd, ".tocbss"); 11789 if (s == NULL || (s->flags & SEC_EXCLUDE) != 0) 11790 s = bfd_get_section_by_name (obfd, ".plt"); 11791 if (s == NULL || (s->flags & SEC_EXCLUDE) != 0) 11792 { 11793 /* This may happen for 11794 o references to TOC base (SYM@toc / TOC[tc0]) without a 11795 .toc directive 11796 o bad linker script 11797 o --gc-sections and empty TOC sections 11798 11799 FIXME: Warn user? */ 11800 11801 /* Look for a likely section. We probably won't even be 11802 using TOCstart. */ 11803 for (s = obfd->sections; s != NULL; s = s->next) 11804 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_READONLY 11805 | SEC_EXCLUDE)) 11806 == (SEC_ALLOC | SEC_SMALL_DATA)) 11807 break; 11808 if (s == NULL) 11809 for (s = obfd->sections; s != NULL; s = s->next) 11810 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_EXCLUDE)) 11811 == (SEC_ALLOC | SEC_SMALL_DATA)) 11812 break; 11813 if (s == NULL) 11814 for (s = obfd->sections; s != NULL; s = s->next) 11815 if ((s->flags & (SEC_ALLOC | SEC_READONLY | SEC_EXCLUDE)) 11816 == SEC_ALLOC) 11817 break; 11818 if (s == NULL) 11819 for (s = obfd->sections; s != NULL; s = s->next) 11820 if ((s->flags & (SEC_ALLOC | SEC_EXCLUDE)) == SEC_ALLOC) 11821 break; 11822 } 11823 11824 TOCstart = 0; 11825 if (s != NULL) 11826 TOCstart = s->output_section->vma + s->output_offset; 11827 11828 return TOCstart; 11829 } 11830 11831 /* Build all the stubs associated with the current output file. 11832 The stubs are kept in a hash table attached to the main linker 11833 hash table. This function is called via gldelf64ppc_finish. */ 11834 11835 bfd_boolean 11836 ppc64_elf_build_stubs (bfd_boolean emit_stub_syms, 11837 struct bfd_link_info *info, 11838 char **stats) 11839 { 11840 struct ppc_link_hash_table *htab = ppc_hash_table (info); 11841 asection *stub_sec; 11842 bfd_byte *p; 11843 int stub_sec_count = 0; 11844 11845 if (htab == NULL) 11846 return FALSE; 11847 11848 htab->emit_stub_syms = emit_stub_syms; 11849 11850 /* Allocate memory to hold the linker stubs. */ 11851 for (stub_sec = htab->stub_bfd->sections; 11852 stub_sec != NULL; 11853 stub_sec = stub_sec->next) 11854 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0 11855 && stub_sec->size != 0) 11856 { 11857 stub_sec->contents = bfd_zalloc (htab->stub_bfd, stub_sec->size); 11858 if (stub_sec->contents == NULL) 11859 return FALSE; 11860 /* We want to check that built size is the same as calculated 11861 size. rawsize is a convenient location to use. */ 11862 stub_sec->rawsize = stub_sec->size; 11863 stub_sec->size = 0; 11864 } 11865 11866 if (htab->glink != NULL && htab->glink->size != 0) 11867 { 11868 unsigned int indx; 11869 bfd_vma plt0; 11870 11871 /* Build the .glink plt call stub. */ 11872 if (htab->emit_stub_syms) 11873 { 11874 struct elf_link_hash_entry *h; 11875 h = elf_link_hash_lookup (&htab->elf, "__glink_PLTresolve", 11876 TRUE, FALSE, FALSE); 11877 if (h == NULL) 11878 return FALSE; 11879 if (h->root.type == bfd_link_hash_new) 11880 { 11881 h->root.type = bfd_link_hash_defined; 11882 h->root.u.def.section = htab->glink; 11883 h->root.u.def.value = 8; 11884 h->ref_regular = 1; 11885 h->def_regular = 1; 11886 h->ref_regular_nonweak = 1; 11887 h->forced_local = 1; 11888 h->non_elf = 0; 11889 } 11890 } 11891 plt0 = htab->plt->output_section->vma + htab->plt->output_offset - 16; 11892 if (info->emitrelocations) 11893 { 11894 Elf_Internal_Rela *r = get_relocs (htab->glink, 1); 11895 if (r == NULL) 11896 return FALSE; 11897 r->r_offset = (htab->glink->output_offset 11898 + htab->glink->output_section->vma); 11899 r->r_info = ELF64_R_INFO (0, R_PPC64_REL64); 11900 r->r_addend = plt0; 11901 } 11902 p = htab->glink->contents; 11903 plt0 -= htab->glink->output_section->vma + htab->glink->output_offset; 11904 bfd_put_64 (htab->glink->owner, plt0, p); 11905 p += 8; 11906 bfd_put_32 (htab->glink->owner, MFLR_R12, p); 11907 p += 4; 11908 bfd_put_32 (htab->glink->owner, BCL_20_31, p); 11909 p += 4; 11910 bfd_put_32 (htab->glink->owner, MFLR_R11, p); 11911 p += 4; 11912 bfd_put_32 (htab->glink->owner, LD_R2_M16R11, p); 11913 p += 4; 11914 bfd_put_32 (htab->glink->owner, MTLR_R12, p); 11915 p += 4; 11916 bfd_put_32 (htab->glink->owner, ADD_R12_R2_R11, p); 11917 p += 4; 11918 bfd_put_32 (htab->glink->owner, LD_R11_0R12, p); 11919 p += 4; 11920 bfd_put_32 (htab->glink->owner, LD_R2_0R12 | 8, p); 11921 p += 4; 11922 bfd_put_32 (htab->glink->owner, MTCTR_R11, p); 11923 p += 4; 11924 bfd_put_32 (htab->glink->owner, LD_R11_0R12 | 16, p); 11925 p += 4; 11926 bfd_put_32 (htab->glink->owner, BCTR, p); 11927 p += 4; 11928 while (p - htab->glink->contents < GLINK_CALL_STUB_SIZE) 11929 { 11930 bfd_put_32 (htab->glink->owner, NOP, p); 11931 p += 4; 11932 } 11933 11934 /* Build the .glink lazy link call stubs. */ 11935 indx = 0; 11936 while (p < htab->glink->contents + htab->glink->size) 11937 { 11938 if (indx < 0x8000) 11939 { 11940 bfd_put_32 (htab->glink->owner, LI_R0_0 | indx, p); 11941 p += 4; 11942 } 11943 else 11944 { 11945 bfd_put_32 (htab->glink->owner, LIS_R0_0 | PPC_HI (indx), p); 11946 p += 4; 11947 bfd_put_32 (htab->glink->owner, ORI_R0_R0_0 | PPC_LO (indx), p); 11948 p += 4; 11949 } 11950 bfd_put_32 (htab->glink->owner, 11951 B_DOT | ((htab->glink->contents - p + 8) & 0x3fffffc), p); 11952 indx++; 11953 p += 4; 11954 } 11955 htab->glink->rawsize = p - htab->glink->contents; 11956 } 11957 11958 if (htab->brlt->size != 0) 11959 { 11960 htab->brlt->contents = bfd_zalloc (htab->brlt->owner, 11961 htab->brlt->size); 11962 if (htab->brlt->contents == NULL) 11963 return FALSE; 11964 } 11965 if (htab->relbrlt != NULL && htab->relbrlt->size != 0) 11966 { 11967 htab->relbrlt->contents = bfd_zalloc (htab->relbrlt->owner, 11968 htab->relbrlt->size); 11969 if (htab->relbrlt->contents == NULL) 11970 return FALSE; 11971 } 11972 11973 if (htab->glink_eh_frame != NULL 11974 && htab->glink_eh_frame->size != 0) 11975 { 11976 bfd_vma val; 11977 bfd_byte *last_fde; 11978 size_t last_fde_len, size, align, pad; 11979 11980 p = bfd_zalloc (htab->glink_eh_frame->owner, htab->glink_eh_frame->size); 11981 if (p == NULL) 11982 return FALSE; 11983 htab->glink_eh_frame->contents = p; 11984 last_fde = p; 11985 11986 htab->glink_eh_frame->rawsize = htab->glink_eh_frame->size; 11987 11988 memcpy (p, glink_eh_frame_cie, sizeof (glink_eh_frame_cie)); 11989 /* CIE length (rewrite in case little-endian). */ 11990 last_fde_len = sizeof (glink_eh_frame_cie) - 4; 11991 bfd_put_32 (htab->elf.dynobj, last_fde_len, p); 11992 p += sizeof (glink_eh_frame_cie); 11993 11994 for (stub_sec = htab->stub_bfd->sections; 11995 stub_sec != NULL; 11996 stub_sec = stub_sec->next) 11997 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 11998 { 11999 last_fde = p; 12000 last_fde_len = 16; 12001 /* FDE length. */ 12002 bfd_put_32 (htab->elf.dynobj, 16, p); 12003 p += 4; 12004 /* CIE pointer. */ 12005 val = p - htab->glink_eh_frame->contents; 12006 bfd_put_32 (htab->elf.dynobj, val, p); 12007 p += 4; 12008 /* Offset to stub section. */ 12009 val = (stub_sec->output_section->vma 12010 + stub_sec->output_offset); 12011 val -= (htab->glink_eh_frame->output_section->vma 12012 + htab->glink_eh_frame->output_offset); 12013 val -= p - htab->glink_eh_frame->contents; 12014 if (val + 0x80000000 > 0xffffffff) 12015 { 12016 info->callbacks->einfo 12017 (_("%P: %s offset too large for .eh_frame sdata4 encoding"), 12018 stub_sec->name); 12019 return FALSE; 12020 } 12021 bfd_put_32 (htab->elf.dynobj, val, p); 12022 p += 4; 12023 /* stub section size. */ 12024 bfd_put_32 (htab->elf.dynobj, stub_sec->rawsize, p); 12025 p += 4; 12026 /* Augmentation. */ 12027 p += 1; 12028 /* Pad. */ 12029 p += 3; 12030 } 12031 if (htab->glink != NULL && htab->glink->size != 0) 12032 { 12033 last_fde = p; 12034 last_fde_len = 20; 12035 /* FDE length. */ 12036 bfd_put_32 (htab->elf.dynobj, 20, p); 12037 p += 4; 12038 /* CIE pointer. */ 12039 val = p - htab->glink_eh_frame->contents; 12040 bfd_put_32 (htab->elf.dynobj, val, p); 12041 p += 4; 12042 /* Offset to .glink. */ 12043 val = (htab->glink->output_section->vma 12044 + htab->glink->output_offset 12045 + 8); 12046 val -= (htab->glink_eh_frame->output_section->vma 12047 + htab->glink_eh_frame->output_offset); 12048 val -= p - htab->glink_eh_frame->contents; 12049 if (val + 0x80000000 > 0xffffffff) 12050 { 12051 info->callbacks->einfo 12052 (_("%P: %s offset too large for .eh_frame sdata4 encoding"), 12053 htab->glink->name); 12054 return FALSE; 12055 } 12056 bfd_put_32 (htab->elf.dynobj, val, p); 12057 p += 4; 12058 /* .glink size. */ 12059 bfd_put_32 (htab->elf.dynobj, htab->glink->rawsize - 8, p); 12060 p += 4; 12061 /* Augmentation. */ 12062 p += 1; 12063 12064 *p++ = DW_CFA_advance_loc + 1; 12065 *p++ = DW_CFA_register; 12066 *p++ = 65; 12067 *p++ = 12; 12068 *p++ = DW_CFA_advance_loc + 4; 12069 *p++ = DW_CFA_restore_extended; 12070 *p++ = 65; 12071 } 12072 /* Subsume any padding into the last FDE if user .eh_frame 12073 sections are aligned more than glink_eh_frame. Otherwise any 12074 zero padding will be seen as a terminator. */ 12075 size = p - htab->glink_eh_frame->contents; 12076 align = 1; 12077 align <<= htab->glink_eh_frame->output_section->alignment_power; 12078 align -= 1; 12079 pad = ((size + align) & ~align) - size; 12080 htab->glink_eh_frame->size = size + pad; 12081 bfd_put_32 (htab->elf.dynobj, last_fde_len + pad, last_fde); 12082 } 12083 12084 /* Build the stubs as directed by the stub hash table. */ 12085 bfd_hash_traverse (&htab->stub_hash_table, ppc_build_one_stub, info); 12086 12087 if (htab->relbrlt != NULL) 12088 htab->relbrlt->reloc_count = 0; 12089 12090 if (htab->plt_stub_align != 0) 12091 for (stub_sec = htab->stub_bfd->sections; 12092 stub_sec != NULL; 12093 stub_sec = stub_sec->next) 12094 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 12095 stub_sec->size = ((stub_sec->size + (1 << htab->plt_stub_align) - 1) 12096 & (-1 << htab->plt_stub_align)); 12097 12098 for (stub_sec = htab->stub_bfd->sections; 12099 stub_sec != NULL; 12100 stub_sec = stub_sec->next) 12101 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 12102 { 12103 stub_sec_count += 1; 12104 if (stub_sec->rawsize != stub_sec->size) 12105 break; 12106 } 12107 12108 if (stub_sec != NULL 12109 || htab->glink->rawsize != htab->glink->size 12110 || (htab->glink_eh_frame != NULL 12111 && htab->glink_eh_frame->rawsize != htab->glink_eh_frame->size)) 12112 { 12113 htab->stub_error = TRUE; 12114 info->callbacks->einfo (_("%P: stubs don't match calculated size\n")); 12115 } 12116 12117 if (htab->stub_error) 12118 return FALSE; 12119 12120 if (stats != NULL) 12121 { 12122 *stats = bfd_malloc (500); 12123 if (*stats == NULL) 12124 return FALSE; 12125 12126 sprintf (*stats, _("linker stubs in %u group%s\n" 12127 " branch %lu\n" 12128 " toc adjust %lu\n" 12129 " long branch %lu\n" 12130 " long toc adj %lu\n" 12131 " plt call %lu\n" 12132 " plt call toc %lu"), 12133 stub_sec_count, 12134 stub_sec_count == 1 ? "" : "s", 12135 htab->stub_count[ppc_stub_long_branch - 1], 12136 htab->stub_count[ppc_stub_long_branch_r2off - 1], 12137 htab->stub_count[ppc_stub_plt_branch - 1], 12138 htab->stub_count[ppc_stub_plt_branch_r2off - 1], 12139 htab->stub_count[ppc_stub_plt_call - 1], 12140 htab->stub_count[ppc_stub_plt_call_r2save - 1]); 12141 } 12142 return TRUE; 12143 } 12144 12145 /* This function undoes the changes made by add_symbol_adjust. */ 12146 12147 static bfd_boolean 12148 undo_symbol_twiddle (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) 12149 { 12150 struct ppc_link_hash_entry *eh; 12151 12152 if (h->root.type == bfd_link_hash_indirect) 12153 return TRUE; 12154 12155 eh = (struct ppc_link_hash_entry *) h; 12156 if (eh->elf.root.type != bfd_link_hash_undefweak || !eh->was_undefined) 12157 return TRUE; 12158 12159 eh->elf.root.type = bfd_link_hash_undefined; 12160 return TRUE; 12161 } 12162 12163 void 12164 ppc64_elf_restore_symbols (struct bfd_link_info *info) 12165 { 12166 struct ppc_link_hash_table *htab = ppc_hash_table (info); 12167 12168 if (htab != NULL) 12169 elf_link_hash_traverse (&htab->elf, undo_symbol_twiddle, info); 12170 } 12171 12172 /* What to do when ld finds relocations against symbols defined in 12173 discarded sections. */ 12174 12175 static unsigned int 12176 ppc64_elf_action_discarded (asection *sec) 12177 { 12178 if (strcmp (".opd", sec->name) == 0) 12179 return 0; 12180 12181 if (strcmp (".toc", sec->name) == 0) 12182 return 0; 12183 12184 if (strcmp (".toc1", sec->name) == 0) 12185 return 0; 12186 12187 return _bfd_elf_default_action_discarded (sec); 12188 } 12189 12190 /* The RELOCATE_SECTION function is called by the ELF backend linker 12191 to handle the relocations for a section. 12192 12193 The relocs are always passed as Rela structures; if the section 12194 actually uses Rel structures, the r_addend field will always be 12195 zero. 12196 12197 This function is responsible for adjust the section contents as 12198 necessary, and (if using Rela relocs and generating a 12199 relocatable output file) adjusting the reloc addend as 12200 necessary. 12201 12202 This function does not have to worry about setting the reloc 12203 address or the reloc symbol index. 12204 12205 LOCAL_SYMS is a pointer to the swapped in local symbols. 12206 12207 LOCAL_SECTIONS is an array giving the section in the input file 12208 corresponding to the st_shndx field of each local symbol. 12209 12210 The global hash table entry for the global symbols can be found 12211 via elf_sym_hashes (input_bfd). 12212 12213 When generating relocatable output, this function must handle 12214 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 12215 going to be the section symbol corresponding to the output 12216 section, which means that the addend must be adjusted 12217 accordingly. */ 12218 12219 static bfd_boolean 12220 ppc64_elf_relocate_section (bfd *output_bfd, 12221 struct bfd_link_info *info, 12222 bfd *input_bfd, 12223 asection *input_section, 12224 bfd_byte *contents, 12225 Elf_Internal_Rela *relocs, 12226 Elf_Internal_Sym *local_syms, 12227 asection **local_sections) 12228 { 12229 struct ppc_link_hash_table *htab; 12230 Elf_Internal_Shdr *symtab_hdr; 12231 struct elf_link_hash_entry **sym_hashes; 12232 Elf_Internal_Rela *rel; 12233 Elf_Internal_Rela *relend; 12234 Elf_Internal_Rela outrel; 12235 bfd_byte *loc; 12236 struct got_entry **local_got_ents; 12237 bfd_vma TOCstart; 12238 bfd_boolean ret = TRUE; 12239 bfd_boolean is_opd; 12240 /* Assume 'at' branch hints. */ 12241 bfd_boolean is_isa_v2 = TRUE; 12242 bfd_vma d_offset = (bfd_big_endian (output_bfd) ? 2 : 0); 12243 12244 /* Initialize howto table if needed. */ 12245 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 12246 ppc_howto_init (); 12247 12248 htab = ppc_hash_table (info); 12249 if (htab == NULL) 12250 return FALSE; 12251 12252 /* Don't relocate stub sections. */ 12253 if (input_section->owner == htab->stub_bfd) 12254 return TRUE; 12255 12256 BFD_ASSERT (is_ppc64_elf (input_bfd)); 12257 12258 local_got_ents = elf_local_got_ents (input_bfd); 12259 TOCstart = elf_gp (output_bfd); 12260 symtab_hdr = &elf_symtab_hdr (input_bfd); 12261 sym_hashes = elf_sym_hashes (input_bfd); 12262 is_opd = ppc64_elf_section_data (input_section)->sec_type == sec_opd; 12263 12264 rel = relocs; 12265 relend = relocs + input_section->reloc_count; 12266 for (; rel < relend; rel++) 12267 { 12268 enum elf_ppc64_reloc_type r_type; 12269 bfd_vma addend; 12270 bfd_reloc_status_type r; 12271 Elf_Internal_Sym *sym; 12272 asection *sec; 12273 struct elf_link_hash_entry *h_elf; 12274 struct ppc_link_hash_entry *h; 12275 struct ppc_link_hash_entry *fdh; 12276 const char *sym_name; 12277 unsigned long r_symndx, toc_symndx; 12278 bfd_vma toc_addend; 12279 unsigned char tls_mask, tls_gd, tls_type; 12280 unsigned char sym_type; 12281 bfd_vma relocation; 12282 bfd_boolean unresolved_reloc; 12283 bfd_boolean warned; 12284 enum { DEST_NORMAL, DEST_OPD, DEST_STUB } reloc_dest; 12285 unsigned int insn; 12286 unsigned int mask; 12287 struct ppc_stub_hash_entry *stub_entry; 12288 bfd_vma max_br_offset; 12289 bfd_vma from; 12290 const Elf_Internal_Rela orig_rel = *rel; 12291 12292 r_type = ELF64_R_TYPE (rel->r_info); 12293 r_symndx = ELF64_R_SYM (rel->r_info); 12294 12295 /* For old style R_PPC64_TOC relocs with a zero symbol, use the 12296 symbol of the previous ADDR64 reloc. The symbol gives us the 12297 proper TOC base to use. */ 12298 if (rel->r_info == ELF64_R_INFO (0, R_PPC64_TOC) 12299 && rel != relocs 12300 && ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_ADDR64 12301 && is_opd) 12302 r_symndx = ELF64_R_SYM (rel[-1].r_info); 12303 12304 sym = NULL; 12305 sec = NULL; 12306 h_elf = NULL; 12307 sym_name = NULL; 12308 unresolved_reloc = FALSE; 12309 warned = FALSE; 12310 12311 if (r_symndx < symtab_hdr->sh_info) 12312 { 12313 /* It's a local symbol. */ 12314 struct _opd_sec_data *opd; 12315 12316 sym = local_syms + r_symndx; 12317 sec = local_sections[r_symndx]; 12318 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, sec); 12319 sym_type = ELF64_ST_TYPE (sym->st_info); 12320 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 12321 opd = get_opd_info (sec); 12322 if (opd != NULL && opd->adjust != NULL) 12323 { 12324 long adjust = opd->adjust[(sym->st_value + rel->r_addend) / 8]; 12325 if (adjust == -1) 12326 relocation = 0; 12327 else 12328 { 12329 /* If this is a relocation against the opd section sym 12330 and we have edited .opd, adjust the reloc addend so 12331 that ld -r and ld --emit-relocs output is correct. 12332 If it is a reloc against some other .opd symbol, 12333 then the symbol value will be adjusted later. */ 12334 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) 12335 rel->r_addend += adjust; 12336 else 12337 relocation += adjust; 12338 } 12339 } 12340 } 12341 else 12342 { 12343 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 12344 r_symndx, symtab_hdr, sym_hashes, 12345 h_elf, sec, relocation, 12346 unresolved_reloc, warned); 12347 sym_name = h_elf->root.root.string; 12348 sym_type = h_elf->type; 12349 if (sec != NULL 12350 && sec->owner == output_bfd 12351 && strcmp (sec->name, ".opd") == 0) 12352 { 12353 /* This is a symbol defined in a linker script. All 12354 such are defined in output sections, even those 12355 defined by simple assignment from a symbol defined in 12356 an input section. Transfer the symbol to an 12357 appropriate input .opd section, so that a branch to 12358 this symbol will be mapped to the location specified 12359 by the opd entry. */ 12360 struct bfd_link_order *lo; 12361 for (lo = sec->map_head.link_order; lo != NULL; lo = lo->next) 12362 if (lo->type == bfd_indirect_link_order) 12363 { 12364 asection *isec = lo->u.indirect.section; 12365 if (h_elf->root.u.def.value >= isec->output_offset 12366 && h_elf->root.u.def.value < (isec->output_offset 12367 + isec->size)) 12368 { 12369 h_elf->root.u.def.value -= isec->output_offset; 12370 h_elf->root.u.def.section = isec; 12371 sec = isec; 12372 break; 12373 } 12374 } 12375 } 12376 } 12377 h = (struct ppc_link_hash_entry *) h_elf; 12378 12379 if (sec != NULL && discarded_section (sec)) 12380 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 12381 rel, 1, relend, 12382 ppc64_elf_howto_table[r_type], 0, 12383 contents); 12384 12385 if (info->relocatable) 12386 continue; 12387 12388 /* TLS optimizations. Replace instruction sequences and relocs 12389 based on information we collected in tls_optimize. We edit 12390 RELOCS so that --emit-relocs will output something sensible 12391 for the final instruction stream. */ 12392 tls_mask = 0; 12393 tls_gd = 0; 12394 toc_symndx = 0; 12395 if (h != NULL) 12396 tls_mask = h->tls_mask; 12397 else if (local_got_ents != NULL) 12398 { 12399 struct plt_entry **local_plt = (struct plt_entry **) 12400 (local_got_ents + symtab_hdr->sh_info); 12401 unsigned char *lgot_masks = (unsigned char *) 12402 (local_plt + symtab_hdr->sh_info); 12403 tls_mask = lgot_masks[r_symndx]; 12404 } 12405 if (tls_mask == 0 12406 && (r_type == R_PPC64_TLS 12407 || r_type == R_PPC64_TLSGD 12408 || r_type == R_PPC64_TLSLD)) 12409 { 12410 /* Check for toc tls entries. */ 12411 unsigned char *toc_tls; 12412 12413 if (!get_tls_mask (&toc_tls, &toc_symndx, &toc_addend, 12414 &local_syms, rel, input_bfd)) 12415 return FALSE; 12416 12417 if (toc_tls) 12418 tls_mask = *toc_tls; 12419 } 12420 12421 /* Check that tls relocs are used with tls syms, and non-tls 12422 relocs are used with non-tls syms. */ 12423 if (r_symndx != STN_UNDEF 12424 && r_type != R_PPC64_NONE 12425 && (h == NULL 12426 || h->elf.root.type == bfd_link_hash_defined 12427 || h->elf.root.type == bfd_link_hash_defweak) 12428 && (IS_PPC64_TLS_RELOC (r_type) 12429 != (sym_type == STT_TLS 12430 || (sym_type == STT_SECTION 12431 && (sec->flags & SEC_THREAD_LOCAL) != 0)))) 12432 { 12433 if (tls_mask != 0 12434 && (r_type == R_PPC64_TLS 12435 || r_type == R_PPC64_TLSGD 12436 || r_type == R_PPC64_TLSLD)) 12437 /* R_PPC64_TLS is OK against a symbol in the TOC. */ 12438 ; 12439 else 12440 info->callbacks->einfo 12441 (!IS_PPC64_TLS_RELOC (r_type) 12442 ? _("%P: %H: %s used with TLS symbol `%T'\n") 12443 : _("%P: %H: %s used with non-TLS symbol `%T'\n"), 12444 input_bfd, input_section, rel->r_offset, 12445 ppc64_elf_howto_table[r_type]->name, 12446 sym_name); 12447 } 12448 12449 /* Ensure reloc mapping code below stays sane. */ 12450 if (R_PPC64_TOC16_LO_DS != R_PPC64_TOC16_DS + 1 12451 || R_PPC64_TOC16_LO != R_PPC64_TOC16 + 1 12452 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TLSGD16 & 3) 12453 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TLSGD16_LO & 3) 12454 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TLSGD16_HI & 3) 12455 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TLSGD16_HA & 3) 12456 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TPREL16_DS & 3) 12457 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TPREL16_LO_DS & 3) 12458 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TPREL16_HI & 3) 12459 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TPREL16_HA & 3)) 12460 abort (); 12461 12462 switch (r_type) 12463 { 12464 default: 12465 break; 12466 12467 case R_PPC64_LO_DS_OPT: 12468 insn = bfd_get_32 (output_bfd, contents + rel->r_offset - d_offset); 12469 if ((insn & (0x3f << 26)) != 58u << 26) 12470 abort (); 12471 insn += (14u << 26) - (58u << 26); 12472 bfd_put_32 (output_bfd, insn, contents + rel->r_offset - d_offset); 12473 r_type = R_PPC64_TOC16_LO; 12474 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12475 break; 12476 12477 case R_PPC64_TOC16: 12478 case R_PPC64_TOC16_LO: 12479 case R_PPC64_TOC16_DS: 12480 case R_PPC64_TOC16_LO_DS: 12481 { 12482 /* Check for toc tls entries. */ 12483 unsigned char *toc_tls; 12484 int retval; 12485 12486 retval = get_tls_mask (&toc_tls, &toc_symndx, &toc_addend, 12487 &local_syms, rel, input_bfd); 12488 if (retval == 0) 12489 return FALSE; 12490 12491 if (toc_tls) 12492 { 12493 tls_mask = *toc_tls; 12494 if (r_type == R_PPC64_TOC16_DS 12495 || r_type == R_PPC64_TOC16_LO_DS) 12496 { 12497 if (tls_mask != 0 12498 && (tls_mask & (TLS_DTPREL | TLS_TPREL)) == 0) 12499 goto toctprel; 12500 } 12501 else 12502 { 12503 /* If we found a GD reloc pair, then we might be 12504 doing a GD->IE transition. */ 12505 if (retval == 2) 12506 { 12507 tls_gd = TLS_TPRELGD; 12508 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 12509 goto tls_ldgd_opt; 12510 } 12511 else if (retval == 3) 12512 { 12513 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 12514 goto tls_ldgd_opt; 12515 } 12516 } 12517 } 12518 } 12519 break; 12520 12521 case R_PPC64_GOT_TPREL16_HI: 12522 case R_PPC64_GOT_TPREL16_HA: 12523 if (tls_mask != 0 12524 && (tls_mask & TLS_TPREL) == 0) 12525 { 12526 rel->r_offset -= d_offset; 12527 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 12528 r_type = R_PPC64_NONE; 12529 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12530 } 12531 break; 12532 12533 case R_PPC64_GOT_TPREL16_DS: 12534 case R_PPC64_GOT_TPREL16_LO_DS: 12535 if (tls_mask != 0 12536 && (tls_mask & TLS_TPREL) == 0) 12537 { 12538 toctprel: 12539 insn = bfd_get_32 (output_bfd, contents + rel->r_offset - d_offset); 12540 insn &= 31 << 21; 12541 insn |= 0x3c0d0000; /* addis 0,13,0 */ 12542 bfd_put_32 (output_bfd, insn, contents + rel->r_offset - d_offset); 12543 r_type = R_PPC64_TPREL16_HA; 12544 if (toc_symndx != 0) 12545 { 12546 rel->r_info = ELF64_R_INFO (toc_symndx, r_type); 12547 rel->r_addend = toc_addend; 12548 /* We changed the symbol. Start over in order to 12549 get h, sym, sec etc. right. */ 12550 rel--; 12551 continue; 12552 } 12553 else 12554 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12555 } 12556 break; 12557 12558 case R_PPC64_TLS: 12559 if (tls_mask != 0 12560 && (tls_mask & TLS_TPREL) == 0) 12561 { 12562 insn = bfd_get_32 (output_bfd, contents + rel->r_offset); 12563 insn = _bfd_elf_ppc_at_tls_transform (insn, 13); 12564 if (insn == 0) 12565 abort (); 12566 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 12567 /* Was PPC64_TLS which sits on insn boundary, now 12568 PPC64_TPREL16_LO which is at low-order half-word. */ 12569 rel->r_offset += d_offset; 12570 r_type = R_PPC64_TPREL16_LO; 12571 if (toc_symndx != 0) 12572 { 12573 rel->r_info = ELF64_R_INFO (toc_symndx, r_type); 12574 rel->r_addend = toc_addend; 12575 /* We changed the symbol. Start over in order to 12576 get h, sym, sec etc. right. */ 12577 rel--; 12578 continue; 12579 } 12580 else 12581 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12582 } 12583 break; 12584 12585 case R_PPC64_GOT_TLSGD16_HI: 12586 case R_PPC64_GOT_TLSGD16_HA: 12587 tls_gd = TLS_TPRELGD; 12588 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 12589 goto tls_gdld_hi; 12590 break; 12591 12592 case R_PPC64_GOT_TLSLD16_HI: 12593 case R_PPC64_GOT_TLSLD16_HA: 12594 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 12595 { 12596 tls_gdld_hi: 12597 if ((tls_mask & tls_gd) != 0) 12598 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3) 12599 + R_PPC64_GOT_TPREL16_DS); 12600 else 12601 { 12602 rel->r_offset -= d_offset; 12603 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 12604 r_type = R_PPC64_NONE; 12605 } 12606 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12607 } 12608 break; 12609 12610 case R_PPC64_GOT_TLSGD16: 12611 case R_PPC64_GOT_TLSGD16_LO: 12612 tls_gd = TLS_TPRELGD; 12613 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 12614 goto tls_ldgd_opt; 12615 break; 12616 12617 case R_PPC64_GOT_TLSLD16: 12618 case R_PPC64_GOT_TLSLD16_LO: 12619 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 12620 { 12621 unsigned int insn1, insn2, insn3; 12622 bfd_vma offset; 12623 12624 tls_ldgd_opt: 12625 offset = (bfd_vma) -1; 12626 /* If not using the newer R_PPC64_TLSGD/LD to mark 12627 __tls_get_addr calls, we must trust that the call 12628 stays with its arg setup insns, ie. that the next 12629 reloc is the __tls_get_addr call associated with 12630 the current reloc. Edit both insns. */ 12631 if (input_section->has_tls_get_addr_call 12632 && rel + 1 < relend 12633 && branch_reloc_hash_match (input_bfd, rel + 1, 12634 htab->tls_get_addr, 12635 htab->tls_get_addr_fd)) 12636 offset = rel[1].r_offset; 12637 if ((tls_mask & tls_gd) != 0) 12638 { 12639 /* IE */ 12640 insn1 = bfd_get_32 (output_bfd, 12641 contents + rel->r_offset - d_offset); 12642 insn1 &= (1 << 26) - (1 << 2); 12643 insn1 |= 58 << 26; /* ld */ 12644 insn2 = 0x7c636a14; /* add 3,3,13 */ 12645 if (offset != (bfd_vma) -1) 12646 rel[1].r_info = ELF64_R_INFO (STN_UNDEF, R_PPC64_NONE); 12647 if ((tls_mask & TLS_EXPLICIT) == 0) 12648 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3) 12649 + R_PPC64_GOT_TPREL16_DS); 12650 else 12651 r_type += R_PPC64_TOC16_DS - R_PPC64_TOC16; 12652 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12653 } 12654 else 12655 { 12656 /* LE */ 12657 insn1 = 0x3c6d0000; /* addis 3,13,0 */ 12658 insn2 = 0x38630000; /* addi 3,3,0 */ 12659 if (tls_gd == 0) 12660 { 12661 /* Was an LD reloc. */ 12662 if (toc_symndx) 12663 sec = local_sections[toc_symndx]; 12664 for (r_symndx = 0; 12665 r_symndx < symtab_hdr->sh_info; 12666 r_symndx++) 12667 if (local_sections[r_symndx] == sec) 12668 break; 12669 if (r_symndx >= symtab_hdr->sh_info) 12670 r_symndx = STN_UNDEF; 12671 rel->r_addend = htab->elf.tls_sec->vma + DTP_OFFSET; 12672 if (r_symndx != STN_UNDEF) 12673 rel->r_addend -= (local_syms[r_symndx].st_value 12674 + sec->output_offset 12675 + sec->output_section->vma); 12676 } 12677 else if (toc_symndx != 0) 12678 { 12679 r_symndx = toc_symndx; 12680 rel->r_addend = toc_addend; 12681 } 12682 r_type = R_PPC64_TPREL16_HA; 12683 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12684 if (offset != (bfd_vma) -1) 12685 { 12686 rel[1].r_info = ELF64_R_INFO (r_symndx, 12687 R_PPC64_TPREL16_LO); 12688 rel[1].r_offset = offset + d_offset; 12689 rel[1].r_addend = rel->r_addend; 12690 } 12691 } 12692 bfd_put_32 (output_bfd, insn1, 12693 contents + rel->r_offset - d_offset); 12694 if (offset != (bfd_vma) -1) 12695 { 12696 insn3 = bfd_get_32 (output_bfd, 12697 contents + offset + 4); 12698 if (insn3 == NOP 12699 || insn3 == CROR_151515 || insn3 == CROR_313131) 12700 { 12701 rel[1].r_offset += 4; 12702 bfd_put_32 (output_bfd, insn2, contents + offset + 4); 12703 insn2 = NOP; 12704 } 12705 bfd_put_32 (output_bfd, insn2, contents + offset); 12706 } 12707 if ((tls_mask & tls_gd) == 0 12708 && (tls_gd == 0 || toc_symndx != 0)) 12709 { 12710 /* We changed the symbol. Start over in order 12711 to get h, sym, sec etc. right. */ 12712 rel--; 12713 continue; 12714 } 12715 } 12716 break; 12717 12718 case R_PPC64_TLSGD: 12719 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 12720 { 12721 unsigned int insn2, insn3; 12722 bfd_vma offset = rel->r_offset; 12723 12724 if ((tls_mask & TLS_TPRELGD) != 0) 12725 { 12726 /* IE */ 12727 r_type = R_PPC64_NONE; 12728 insn2 = 0x7c636a14; /* add 3,3,13 */ 12729 } 12730 else 12731 { 12732 /* LE */ 12733 if (toc_symndx != 0) 12734 { 12735 r_symndx = toc_symndx; 12736 rel->r_addend = toc_addend; 12737 } 12738 r_type = R_PPC64_TPREL16_LO; 12739 rel->r_offset = offset + d_offset; 12740 insn2 = 0x38630000; /* addi 3,3,0 */ 12741 } 12742 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12743 /* Zap the reloc on the _tls_get_addr call too. */ 12744 BFD_ASSERT (offset == rel[1].r_offset); 12745 rel[1].r_info = ELF64_R_INFO (STN_UNDEF, R_PPC64_NONE); 12746 insn3 = bfd_get_32 (output_bfd, 12747 contents + offset + 4); 12748 if (insn3 == NOP 12749 || insn3 == CROR_151515 || insn3 == CROR_313131) 12750 { 12751 rel->r_offset += 4; 12752 bfd_put_32 (output_bfd, insn2, contents + offset + 4); 12753 insn2 = NOP; 12754 } 12755 bfd_put_32 (output_bfd, insn2, contents + offset); 12756 if ((tls_mask & TLS_TPRELGD) == 0 && toc_symndx != 0) 12757 { 12758 rel--; 12759 continue; 12760 } 12761 } 12762 break; 12763 12764 case R_PPC64_TLSLD: 12765 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 12766 { 12767 unsigned int insn2, insn3; 12768 bfd_vma offset = rel->r_offset; 12769 12770 if (toc_symndx) 12771 sec = local_sections[toc_symndx]; 12772 for (r_symndx = 0; 12773 r_symndx < symtab_hdr->sh_info; 12774 r_symndx++) 12775 if (local_sections[r_symndx] == sec) 12776 break; 12777 if (r_symndx >= symtab_hdr->sh_info) 12778 r_symndx = STN_UNDEF; 12779 rel->r_addend = htab->elf.tls_sec->vma + DTP_OFFSET; 12780 if (r_symndx != STN_UNDEF) 12781 rel->r_addend -= (local_syms[r_symndx].st_value 12782 + sec->output_offset 12783 + sec->output_section->vma); 12784 12785 r_type = R_PPC64_TPREL16_LO; 12786 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12787 rel->r_offset = offset + d_offset; 12788 /* Zap the reloc on the _tls_get_addr call too. */ 12789 BFD_ASSERT (offset == rel[1].r_offset); 12790 rel[1].r_info = ELF64_R_INFO (STN_UNDEF, R_PPC64_NONE); 12791 insn2 = 0x38630000; /* addi 3,3,0 */ 12792 insn3 = bfd_get_32 (output_bfd, 12793 contents + offset + 4); 12794 if (insn3 == NOP 12795 || insn3 == CROR_151515 || insn3 == CROR_313131) 12796 { 12797 rel->r_offset += 4; 12798 bfd_put_32 (output_bfd, insn2, contents + offset + 4); 12799 insn2 = NOP; 12800 } 12801 bfd_put_32 (output_bfd, insn2, contents + offset); 12802 rel--; 12803 continue; 12804 } 12805 break; 12806 12807 case R_PPC64_DTPMOD64: 12808 if (rel + 1 < relend 12809 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64) 12810 && rel[1].r_offset == rel->r_offset + 8) 12811 { 12812 if ((tls_mask & TLS_GD) == 0) 12813 { 12814 rel[1].r_info = ELF64_R_INFO (r_symndx, R_PPC64_NONE); 12815 if ((tls_mask & TLS_TPRELGD) != 0) 12816 r_type = R_PPC64_TPREL64; 12817 else 12818 { 12819 bfd_put_64 (output_bfd, 1, contents + rel->r_offset); 12820 r_type = R_PPC64_NONE; 12821 } 12822 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12823 } 12824 } 12825 else 12826 { 12827 if ((tls_mask & TLS_LD) == 0) 12828 { 12829 bfd_put_64 (output_bfd, 1, contents + rel->r_offset); 12830 r_type = R_PPC64_NONE; 12831 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12832 } 12833 } 12834 break; 12835 12836 case R_PPC64_TPREL64: 12837 if ((tls_mask & TLS_TPREL) == 0) 12838 { 12839 r_type = R_PPC64_NONE; 12840 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 12841 } 12842 break; 12843 } 12844 12845 /* Handle other relocations that tweak non-addend part of insn. */ 12846 insn = 0; 12847 max_br_offset = 1 << 25; 12848 addend = rel->r_addend; 12849 reloc_dest = DEST_NORMAL; 12850 switch (r_type) 12851 { 12852 default: 12853 break; 12854 12855 case R_PPC64_TOCSAVE: 12856 if (relocation + addend == (rel->r_offset 12857 + input_section->output_offset 12858 + input_section->output_section->vma) 12859 && tocsave_find (htab, NO_INSERT, 12860 &local_syms, rel, input_bfd)) 12861 { 12862 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 12863 if (insn == NOP 12864 || insn == CROR_151515 || insn == CROR_313131) 12865 bfd_put_32 (input_bfd, STD_R2_40R1, 12866 contents + rel->r_offset); 12867 } 12868 break; 12869 12870 /* Branch taken prediction relocations. */ 12871 case R_PPC64_ADDR14_BRTAKEN: 12872 case R_PPC64_REL14_BRTAKEN: 12873 insn = 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ 12874 /* Fall thru. */ 12875 12876 /* Branch not taken prediction relocations. */ 12877 case R_PPC64_ADDR14_BRNTAKEN: 12878 case R_PPC64_REL14_BRNTAKEN: 12879 insn |= bfd_get_32 (output_bfd, 12880 contents + rel->r_offset) & ~(0x01 << 21); 12881 /* Fall thru. */ 12882 12883 case R_PPC64_REL14: 12884 max_br_offset = 1 << 15; 12885 /* Fall thru. */ 12886 12887 case R_PPC64_REL24: 12888 /* Calls to functions with a different TOC, such as calls to 12889 shared objects, need to alter the TOC pointer. This is 12890 done using a linkage stub. A REL24 branching to these 12891 linkage stubs needs to be followed by a nop, as the nop 12892 will be replaced with an instruction to restore the TOC 12893 base pointer. */ 12894 fdh = h; 12895 if (h != NULL 12896 && h->oh != NULL 12897 && h->oh->is_func_descriptor) 12898 fdh = ppc_follow_link (h->oh); 12899 stub_entry = ppc_get_stub_entry (input_section, sec, fdh, &orig_rel, 12900 htab); 12901 if (stub_entry != NULL 12902 && (stub_entry->stub_type == ppc_stub_plt_call 12903 || stub_entry->stub_type == ppc_stub_plt_call_r2save 12904 || stub_entry->stub_type == ppc_stub_plt_branch_r2off 12905 || stub_entry->stub_type == ppc_stub_long_branch_r2off)) 12906 { 12907 bfd_boolean can_plt_call = FALSE; 12908 12909 /* All of these stubs will modify r2, so there must be a 12910 branch and link followed by a nop. The nop is 12911 replaced by an insn to restore r2. */ 12912 if (rel->r_offset + 8 <= input_section->size) 12913 { 12914 unsigned long br; 12915 12916 br = bfd_get_32 (input_bfd, 12917 contents + rel->r_offset); 12918 if ((br & 1) != 0) 12919 { 12920 unsigned long nop; 12921 12922 nop = bfd_get_32 (input_bfd, 12923 contents + rel->r_offset + 4); 12924 if (nop == NOP 12925 || nop == CROR_151515 || nop == CROR_313131) 12926 { 12927 if (h != NULL 12928 && (h == htab->tls_get_addr_fd 12929 || h == htab->tls_get_addr) 12930 && !htab->no_tls_get_addr_opt) 12931 { 12932 /* Special stub used, leave nop alone. */ 12933 } 12934 else 12935 bfd_put_32 (input_bfd, LD_R2_40R1, 12936 contents + rel->r_offset + 4); 12937 can_plt_call = TRUE; 12938 } 12939 } 12940 } 12941 12942 if (!can_plt_call && h != NULL) 12943 { 12944 const char *name = h->elf.root.root.string; 12945 12946 if (*name == '.') 12947 ++name; 12948 12949 if (strncmp (name, "__libc_start_main", 17) == 0 12950 && (name[17] == 0 || name[17] == '@')) 12951 { 12952 /* Allow crt1 branch to go via a toc adjusting 12953 stub. Other calls that never return could do 12954 the same, if we could detect such. */ 12955 can_plt_call = TRUE; 12956 } 12957 } 12958 12959 if (!can_plt_call) 12960 { 12961 /* g++ as of 20130507 emits self-calls without a 12962 following nop. This is arguably wrong since we 12963 have conflicting information. On the one hand a 12964 global symbol and on the other a local call 12965 sequence, but don't error for this special case. 12966 It isn't possible to cheaply verify we have 12967 exactly such a call. Allow all calls to the same 12968 section. */ 12969 asection *code_sec = sec; 12970 12971 if (get_opd_info (sec) != NULL) 12972 { 12973 bfd_vma off = (relocation + addend 12974 - sec->output_section->vma 12975 - sec->output_offset); 12976 12977 opd_entry_value (sec, off, &code_sec, NULL, FALSE); 12978 } 12979 if (code_sec == input_section) 12980 can_plt_call = TRUE; 12981 } 12982 12983 if (!can_plt_call) 12984 { 12985 12986 if (stub_entry->stub_type == ppc_stub_plt_call 12987 || stub_entry->stub_type == ppc_stub_plt_call_r2save) 12988 info->callbacks->einfo 12989 (_("%P: %H: call to `%T' lacks nop, can't restore toc; " 12990 "recompile with -fPIC"), 12991 input_bfd, input_section, rel->r_offset, sym_name); 12992 else 12993 info->callbacks->einfo 12994 (_("%P: %H: call to `%T' lacks nop, can't restore toc; " 12995 "(-mcmodel=small toc adjust stub)"), 12996 input_bfd, input_section, rel->r_offset, sym_name); 12997 bfd_set_error (bfd_error_bad_value); 12998 ret = FALSE; 12999 } 13000 13001 if (can_plt_call 13002 && (stub_entry->stub_type == ppc_stub_plt_call 13003 || stub_entry->stub_type == ppc_stub_plt_call_r2save)) 13004 unresolved_reloc = FALSE; 13005 } 13006 13007 if ((stub_entry == NULL 13008 || stub_entry->stub_type == ppc_stub_long_branch 13009 || stub_entry->stub_type == ppc_stub_plt_branch) 13010 && get_opd_info (sec) != NULL) 13011 { 13012 /* The branch destination is the value of the opd entry. */ 13013 bfd_vma off = (relocation + addend 13014 - sec->output_section->vma 13015 - sec->output_offset); 13016 bfd_vma dest = opd_entry_value (sec, off, NULL, NULL, FALSE); 13017 if (dest != (bfd_vma) -1) 13018 { 13019 relocation = dest; 13020 addend = 0; 13021 reloc_dest = DEST_OPD; 13022 } 13023 } 13024 13025 /* If the branch is out of reach we ought to have a long 13026 branch stub. */ 13027 from = (rel->r_offset 13028 + input_section->output_offset 13029 + input_section->output_section->vma); 13030 13031 if (stub_entry != NULL 13032 && (stub_entry->stub_type == ppc_stub_long_branch 13033 || stub_entry->stub_type == ppc_stub_plt_branch) 13034 && (r_type == R_PPC64_ADDR14_BRTAKEN 13035 || r_type == R_PPC64_ADDR14_BRNTAKEN 13036 || (relocation + addend - from + max_br_offset 13037 < 2 * max_br_offset))) 13038 /* Don't use the stub if this branch is in range. */ 13039 stub_entry = NULL; 13040 13041 if (stub_entry != NULL) 13042 { 13043 /* Munge up the value and addend so that we call the stub 13044 rather than the procedure directly. */ 13045 relocation = (stub_entry->stub_offset 13046 + stub_entry->stub_sec->output_offset 13047 + stub_entry->stub_sec->output_section->vma); 13048 addend = 0; 13049 reloc_dest = DEST_STUB; 13050 13051 if ((stub_entry->stub_type == ppc_stub_plt_call 13052 || stub_entry->stub_type == ppc_stub_plt_call_r2save) 13053 && (ALWAYS_EMIT_R2SAVE 13054 || stub_entry->stub_type == ppc_stub_plt_call_r2save) 13055 && rel + 1 < relend 13056 && rel[1].r_offset == rel->r_offset + 4 13057 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_TOCSAVE) 13058 relocation += 4; 13059 } 13060 13061 if (insn != 0) 13062 { 13063 if (is_isa_v2) 13064 { 13065 /* Set 'a' bit. This is 0b00010 in BO field for branch 13066 on CR(BI) insns (BO == 001at or 011at), and 0b01000 13067 for branch on CTR insns (BO == 1a00t or 1a01t). */ 13068 if ((insn & (0x14 << 21)) == (0x04 << 21)) 13069 insn |= 0x02 << 21; 13070 else if ((insn & (0x14 << 21)) == (0x10 << 21)) 13071 insn |= 0x08 << 21; 13072 else 13073 break; 13074 } 13075 else 13076 { 13077 /* Invert 'y' bit if not the default. */ 13078 if ((bfd_signed_vma) (relocation + addend - from) < 0) 13079 insn ^= 0x01 << 21; 13080 } 13081 13082 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 13083 } 13084 13085 /* NOP out calls to undefined weak functions. 13086 We can thus call a weak function without first 13087 checking whether the function is defined. */ 13088 else if (h != NULL 13089 && h->elf.root.type == bfd_link_hash_undefweak 13090 && h->elf.dynindx == -1 13091 && r_type == R_PPC64_REL24 13092 && relocation == 0 13093 && addend == 0) 13094 { 13095 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 13096 continue; 13097 } 13098 break; 13099 } 13100 13101 /* Set `addend'. */ 13102 tls_type = 0; 13103 switch (r_type) 13104 { 13105 default: 13106 info->callbacks->einfo 13107 (_("%P: %B: unknown relocation type %d for `%T'\n"), 13108 input_bfd, (int) r_type, sym_name); 13109 13110 bfd_set_error (bfd_error_bad_value); 13111 ret = FALSE; 13112 continue; 13113 13114 case R_PPC64_NONE: 13115 case R_PPC64_TLS: 13116 case R_PPC64_TLSGD: 13117 case R_PPC64_TLSLD: 13118 case R_PPC64_TOCSAVE: 13119 case R_PPC64_GNU_VTINHERIT: 13120 case R_PPC64_GNU_VTENTRY: 13121 continue; 13122 13123 /* GOT16 relocations. Like an ADDR16 using the symbol's 13124 address in the GOT as relocation value instead of the 13125 symbol's value itself. Also, create a GOT entry for the 13126 symbol and put the symbol value there. */ 13127 case R_PPC64_GOT_TLSGD16: 13128 case R_PPC64_GOT_TLSGD16_LO: 13129 case R_PPC64_GOT_TLSGD16_HI: 13130 case R_PPC64_GOT_TLSGD16_HA: 13131 tls_type = TLS_TLS | TLS_GD; 13132 goto dogot; 13133 13134 case R_PPC64_GOT_TLSLD16: 13135 case R_PPC64_GOT_TLSLD16_LO: 13136 case R_PPC64_GOT_TLSLD16_HI: 13137 case R_PPC64_GOT_TLSLD16_HA: 13138 tls_type = TLS_TLS | TLS_LD; 13139 goto dogot; 13140 13141 case R_PPC64_GOT_TPREL16_DS: 13142 case R_PPC64_GOT_TPREL16_LO_DS: 13143 case R_PPC64_GOT_TPREL16_HI: 13144 case R_PPC64_GOT_TPREL16_HA: 13145 tls_type = TLS_TLS | TLS_TPREL; 13146 goto dogot; 13147 13148 case R_PPC64_GOT_DTPREL16_DS: 13149 case R_PPC64_GOT_DTPREL16_LO_DS: 13150 case R_PPC64_GOT_DTPREL16_HI: 13151 case R_PPC64_GOT_DTPREL16_HA: 13152 tls_type = TLS_TLS | TLS_DTPREL; 13153 goto dogot; 13154 13155 case R_PPC64_GOT16: 13156 case R_PPC64_GOT16_LO: 13157 case R_PPC64_GOT16_HI: 13158 case R_PPC64_GOT16_HA: 13159 case R_PPC64_GOT16_DS: 13160 case R_PPC64_GOT16_LO_DS: 13161 dogot: 13162 { 13163 /* Relocation is to the entry for this symbol in the global 13164 offset table. */ 13165 asection *got; 13166 bfd_vma *offp; 13167 bfd_vma off; 13168 unsigned long indx = 0; 13169 struct got_entry *ent; 13170 13171 if (tls_type == (TLS_TLS | TLS_LD) 13172 && (h == NULL 13173 || !h->elf.def_dynamic)) 13174 ent = ppc64_tlsld_got (input_bfd); 13175 else 13176 { 13177 13178 if (h != NULL) 13179 { 13180 bfd_boolean dyn = htab->elf.dynamic_sections_created; 13181 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, 13182 &h->elf) 13183 || (info->shared 13184 && SYMBOL_CALLS_LOCAL (info, &h->elf))) 13185 /* This is actually a static link, or it is a 13186 -Bsymbolic link and the symbol is defined 13187 locally, or the symbol was forced to be local 13188 because of a version file. */ 13189 ; 13190 else 13191 { 13192 BFD_ASSERT (h->elf.dynindx != -1); 13193 indx = h->elf.dynindx; 13194 unresolved_reloc = FALSE; 13195 } 13196 ent = h->elf.got.glist; 13197 } 13198 else 13199 { 13200 if (local_got_ents == NULL) 13201 abort (); 13202 ent = local_got_ents[r_symndx]; 13203 } 13204 13205 for (; ent != NULL; ent = ent->next) 13206 if (ent->addend == orig_rel.r_addend 13207 && ent->owner == input_bfd 13208 && ent->tls_type == tls_type) 13209 break; 13210 } 13211 13212 if (ent == NULL) 13213 abort (); 13214 if (ent->is_indirect) 13215 ent = ent->got.ent; 13216 offp = &ent->got.offset; 13217 got = ppc64_elf_tdata (ent->owner)->got; 13218 if (got == NULL) 13219 abort (); 13220 13221 /* The offset must always be a multiple of 8. We use the 13222 least significant bit to record whether we have already 13223 processed this entry. */ 13224 off = *offp; 13225 if ((off & 1) != 0) 13226 off &= ~1; 13227 else 13228 { 13229 /* Generate relocs for the dynamic linker, except in 13230 the case of TLSLD where we'll use one entry per 13231 module. */ 13232 asection *relgot; 13233 bfd_boolean ifunc; 13234 13235 *offp = off | 1; 13236 relgot = NULL; 13237 ifunc = (h != NULL 13238 ? h->elf.type == STT_GNU_IFUNC 13239 : ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC); 13240 if ((info->shared || indx != 0) 13241 && (h == NULL 13242 || (tls_type == (TLS_TLS | TLS_LD) 13243 && !h->elf.def_dynamic) 13244 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT 13245 || h->elf.root.type != bfd_link_hash_undefweak)) 13246 relgot = ppc64_elf_tdata (ent->owner)->relgot; 13247 else if (ifunc) 13248 relgot = htab->reliplt; 13249 if (relgot != NULL) 13250 { 13251 outrel.r_offset = (got->output_section->vma 13252 + got->output_offset 13253 + off); 13254 outrel.r_addend = addend; 13255 if (tls_type & (TLS_LD | TLS_GD)) 13256 { 13257 outrel.r_addend = 0; 13258 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPMOD64); 13259 if (tls_type == (TLS_TLS | TLS_GD)) 13260 { 13261 loc = relgot->contents; 13262 loc += (relgot->reloc_count++ 13263 * sizeof (Elf64_External_Rela)); 13264 bfd_elf64_swap_reloca_out (output_bfd, 13265 &outrel, loc); 13266 outrel.r_offset += 8; 13267 outrel.r_addend = addend; 13268 outrel.r_info 13269 = ELF64_R_INFO (indx, R_PPC64_DTPREL64); 13270 } 13271 } 13272 else if (tls_type == (TLS_TLS | TLS_DTPREL)) 13273 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPREL64); 13274 else if (tls_type == (TLS_TLS | TLS_TPREL)) 13275 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_TPREL64); 13276 else if (indx != 0) 13277 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_GLOB_DAT); 13278 else 13279 { 13280 if (ifunc) 13281 outrel.r_info = ELF64_R_INFO (0, R_PPC64_IRELATIVE); 13282 else 13283 outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 13284 13285 /* Write the .got section contents for the sake 13286 of prelink. */ 13287 loc = got->contents + off; 13288 bfd_put_64 (output_bfd, outrel.r_addend + relocation, 13289 loc); 13290 } 13291 13292 if (indx == 0 && tls_type != (TLS_TLS | TLS_LD)) 13293 { 13294 outrel.r_addend += relocation; 13295 if (tls_type & (TLS_GD | TLS_DTPREL | TLS_TPREL)) 13296 outrel.r_addend -= htab->elf.tls_sec->vma; 13297 } 13298 loc = relgot->contents; 13299 loc += (relgot->reloc_count++ 13300 * sizeof (Elf64_External_Rela)); 13301 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 13302 } 13303 13304 /* Init the .got section contents here if we're not 13305 emitting a reloc. */ 13306 else 13307 { 13308 relocation += addend; 13309 if (tls_type == (TLS_TLS | TLS_LD)) 13310 relocation = 1; 13311 else if (tls_type != 0) 13312 { 13313 relocation -= htab->elf.tls_sec->vma + DTP_OFFSET; 13314 if (tls_type == (TLS_TLS | TLS_TPREL)) 13315 relocation += DTP_OFFSET - TP_OFFSET; 13316 13317 if (tls_type == (TLS_TLS | TLS_GD)) 13318 { 13319 bfd_put_64 (output_bfd, relocation, 13320 got->contents + off + 8); 13321 relocation = 1; 13322 } 13323 } 13324 13325 bfd_put_64 (output_bfd, relocation, 13326 got->contents + off); 13327 } 13328 } 13329 13330 if (off >= (bfd_vma) -2) 13331 abort (); 13332 13333 relocation = got->output_section->vma + got->output_offset + off; 13334 addend = -(TOCstart + htab->stub_group[input_section->id].toc_off); 13335 } 13336 break; 13337 13338 case R_PPC64_PLT16_HA: 13339 case R_PPC64_PLT16_HI: 13340 case R_PPC64_PLT16_LO: 13341 case R_PPC64_PLT32: 13342 case R_PPC64_PLT64: 13343 /* Relocation is to the entry for this symbol in the 13344 procedure linkage table. */ 13345 13346 /* Resolve a PLT reloc against a local symbol directly, 13347 without using the procedure linkage table. */ 13348 if (h == NULL) 13349 break; 13350 13351 /* It's possible that we didn't make a PLT entry for this 13352 symbol. This happens when statically linking PIC code, 13353 or when using -Bsymbolic. Go find a match if there is a 13354 PLT entry. */ 13355 if (htab->plt != NULL) 13356 { 13357 struct plt_entry *ent; 13358 for (ent = h->elf.plt.plist; ent != NULL; ent = ent->next) 13359 if (ent->addend == orig_rel.r_addend 13360 && ent->plt.offset != (bfd_vma) -1) 13361 { 13362 relocation = (htab->plt->output_section->vma 13363 + htab->plt->output_offset 13364 + ent->plt.offset); 13365 unresolved_reloc = FALSE; 13366 } 13367 } 13368 break; 13369 13370 case R_PPC64_TOC: 13371 /* Relocation value is TOC base. */ 13372 relocation = TOCstart; 13373 if (r_symndx == STN_UNDEF) 13374 relocation += htab->stub_group[input_section->id].toc_off; 13375 else if (unresolved_reloc) 13376 ; 13377 else if (sec != NULL && sec->id <= htab->top_id) 13378 relocation += htab->stub_group[sec->id].toc_off; 13379 else 13380 unresolved_reloc = TRUE; 13381 goto dodyn; 13382 13383 /* TOC16 relocs. We want the offset relative to the TOC base, 13384 which is the address of the start of the TOC plus 0x8000. 13385 The TOC consists of sections .got, .toc, .tocbss, and .plt, 13386 in this order. */ 13387 case R_PPC64_TOC16: 13388 case R_PPC64_TOC16_LO: 13389 case R_PPC64_TOC16_HI: 13390 case R_PPC64_TOC16_DS: 13391 case R_PPC64_TOC16_LO_DS: 13392 case R_PPC64_TOC16_HA: 13393 addend -= TOCstart + htab->stub_group[input_section->id].toc_off; 13394 break; 13395 13396 /* Relocate against the beginning of the section. */ 13397 case R_PPC64_SECTOFF: 13398 case R_PPC64_SECTOFF_LO: 13399 case R_PPC64_SECTOFF_HI: 13400 case R_PPC64_SECTOFF_DS: 13401 case R_PPC64_SECTOFF_LO_DS: 13402 case R_PPC64_SECTOFF_HA: 13403 if (sec != NULL) 13404 addend -= sec->output_section->vma; 13405 break; 13406 13407 case R_PPC64_REL16: 13408 case R_PPC64_REL16_LO: 13409 case R_PPC64_REL16_HI: 13410 case R_PPC64_REL16_HA: 13411 break; 13412 13413 case R_PPC64_REL14: 13414 case R_PPC64_REL14_BRNTAKEN: 13415 case R_PPC64_REL14_BRTAKEN: 13416 case R_PPC64_REL24: 13417 break; 13418 13419 case R_PPC64_TPREL16: 13420 case R_PPC64_TPREL16_LO: 13421 case R_PPC64_TPREL16_HI: 13422 case R_PPC64_TPREL16_HA: 13423 case R_PPC64_TPREL16_DS: 13424 case R_PPC64_TPREL16_LO_DS: 13425 case R_PPC64_TPREL16_HIGHER: 13426 case R_PPC64_TPREL16_HIGHERA: 13427 case R_PPC64_TPREL16_HIGHEST: 13428 case R_PPC64_TPREL16_HIGHESTA: 13429 if (h != NULL 13430 && h->elf.root.type == bfd_link_hash_undefweak 13431 && h->elf.dynindx == -1) 13432 { 13433 /* Make this relocation against an undefined weak symbol 13434 resolve to zero. This is really just a tweak, since 13435 code using weak externs ought to check that they are 13436 defined before using them. */ 13437 bfd_byte *p = contents + rel->r_offset - d_offset; 13438 13439 insn = bfd_get_32 (output_bfd, p); 13440 insn = _bfd_elf_ppc_at_tprel_transform (insn, 13); 13441 if (insn != 0) 13442 bfd_put_32 (output_bfd, insn, p); 13443 break; 13444 } 13445 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 13446 if (info->shared) 13447 /* The TPREL16 relocs shouldn't really be used in shared 13448 libs as they will result in DT_TEXTREL being set, but 13449 support them anyway. */ 13450 goto dodyn; 13451 break; 13452 13453 case R_PPC64_DTPREL16: 13454 case R_PPC64_DTPREL16_LO: 13455 case R_PPC64_DTPREL16_HI: 13456 case R_PPC64_DTPREL16_HA: 13457 case R_PPC64_DTPREL16_DS: 13458 case R_PPC64_DTPREL16_LO_DS: 13459 case R_PPC64_DTPREL16_HIGHER: 13460 case R_PPC64_DTPREL16_HIGHERA: 13461 case R_PPC64_DTPREL16_HIGHEST: 13462 case R_PPC64_DTPREL16_HIGHESTA: 13463 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 13464 break; 13465 13466 case R_PPC64_DTPMOD64: 13467 relocation = 1; 13468 addend = 0; 13469 goto dodyn; 13470 13471 case R_PPC64_TPREL64: 13472 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 13473 goto dodyn; 13474 13475 case R_PPC64_DTPREL64: 13476 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 13477 /* Fall thru */ 13478 13479 /* Relocations that may need to be propagated if this is a 13480 dynamic object. */ 13481 case R_PPC64_REL30: 13482 case R_PPC64_REL32: 13483 case R_PPC64_REL64: 13484 case R_PPC64_ADDR14: 13485 case R_PPC64_ADDR14_BRNTAKEN: 13486 case R_PPC64_ADDR14_BRTAKEN: 13487 case R_PPC64_ADDR16: 13488 case R_PPC64_ADDR16_DS: 13489 case R_PPC64_ADDR16_HA: 13490 case R_PPC64_ADDR16_HI: 13491 case R_PPC64_ADDR16_HIGHER: 13492 case R_PPC64_ADDR16_HIGHERA: 13493 case R_PPC64_ADDR16_HIGHEST: 13494 case R_PPC64_ADDR16_HIGHESTA: 13495 case R_PPC64_ADDR16_LO: 13496 case R_PPC64_ADDR16_LO_DS: 13497 case R_PPC64_ADDR24: 13498 case R_PPC64_ADDR32: 13499 case R_PPC64_ADDR64: 13500 case R_PPC64_UADDR16: 13501 case R_PPC64_UADDR32: 13502 case R_PPC64_UADDR64: 13503 dodyn: 13504 if ((input_section->flags & SEC_ALLOC) == 0) 13505 break; 13506 13507 if (NO_OPD_RELOCS && is_opd) 13508 break; 13509 13510 if ((info->shared 13511 && (h == NULL 13512 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT 13513 || h->elf.root.type != bfd_link_hash_undefweak) 13514 && (must_be_dyn_reloc (info, r_type) 13515 || !SYMBOL_CALLS_LOCAL (info, &h->elf))) 13516 || (ELIMINATE_COPY_RELOCS 13517 && !info->shared 13518 && h != NULL 13519 && h->elf.dynindx != -1 13520 && !h->elf.non_got_ref 13521 && !h->elf.def_regular) 13522 || (!info->shared 13523 && (h != NULL 13524 ? h->elf.type == STT_GNU_IFUNC 13525 : ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC))) 13526 { 13527 bfd_boolean skip, relocate; 13528 asection *sreloc; 13529 bfd_vma out_off; 13530 13531 /* When generating a dynamic object, these relocations 13532 are copied into the output file to be resolved at run 13533 time. */ 13534 13535 skip = FALSE; 13536 relocate = FALSE; 13537 13538 out_off = _bfd_elf_section_offset (output_bfd, info, 13539 input_section, rel->r_offset); 13540 if (out_off == (bfd_vma) -1) 13541 skip = TRUE; 13542 else if (out_off == (bfd_vma) -2) 13543 skip = TRUE, relocate = TRUE; 13544 out_off += (input_section->output_section->vma 13545 + input_section->output_offset); 13546 outrel.r_offset = out_off; 13547 outrel.r_addend = rel->r_addend; 13548 13549 /* Optimize unaligned reloc use. */ 13550 if ((r_type == R_PPC64_ADDR64 && (out_off & 7) != 0) 13551 || (r_type == R_PPC64_UADDR64 && (out_off & 7) == 0)) 13552 r_type ^= R_PPC64_ADDR64 ^ R_PPC64_UADDR64; 13553 else if ((r_type == R_PPC64_ADDR32 && (out_off & 3) != 0) 13554 || (r_type == R_PPC64_UADDR32 && (out_off & 3) == 0)) 13555 r_type ^= R_PPC64_ADDR32 ^ R_PPC64_UADDR32; 13556 else if ((r_type == R_PPC64_ADDR16 && (out_off & 1) != 0) 13557 || (r_type == R_PPC64_UADDR16 && (out_off & 1) == 0)) 13558 r_type ^= R_PPC64_ADDR16 ^ R_PPC64_UADDR16; 13559 13560 if (skip) 13561 memset (&outrel, 0, sizeof outrel); 13562 else if (!SYMBOL_CALLS_LOCAL (info, &h->elf) 13563 && !is_opd 13564 && r_type != R_PPC64_TOC) 13565 { 13566 BFD_ASSERT (h->elf.dynindx != -1); 13567 outrel.r_info = ELF64_R_INFO (h->elf.dynindx, r_type); 13568 } 13569 else 13570 { 13571 /* This symbol is local, or marked to become local, 13572 or this is an opd section reloc which must point 13573 at a local function. */ 13574 outrel.r_addend += relocation; 13575 if (r_type == R_PPC64_ADDR64 || r_type == R_PPC64_TOC) 13576 { 13577 if (is_opd && h != NULL) 13578 { 13579 /* Lie about opd entries. This case occurs 13580 when building shared libraries and we 13581 reference a function in another shared 13582 lib. The same thing happens for a weak 13583 definition in an application that's 13584 overridden by a strong definition in a 13585 shared lib. (I believe this is a generic 13586 bug in binutils handling of weak syms.) 13587 In these cases we won't use the opd 13588 entry in this lib. */ 13589 unresolved_reloc = FALSE; 13590 } 13591 if (!is_opd 13592 && r_type == R_PPC64_ADDR64 13593 && (h != NULL 13594 ? h->elf.type == STT_GNU_IFUNC 13595 : ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)) 13596 outrel.r_info = ELF64_R_INFO (0, R_PPC64_IRELATIVE); 13597 else 13598 { 13599 outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 13600 13601 /* We need to relocate .opd contents for ld.so. 13602 Prelink also wants simple and consistent rules 13603 for relocs. This make all RELATIVE relocs have 13604 *r_offset equal to r_addend. */ 13605 relocate = TRUE; 13606 } 13607 } 13608 else 13609 { 13610 long indx = 0; 13611 13612 if (h != NULL 13613 ? h->elf.type == STT_GNU_IFUNC 13614 : ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 13615 { 13616 info->callbacks->einfo 13617 (_("%P: %H: %s for indirect " 13618 "function `%T' unsupported\n"), 13619 input_bfd, input_section, rel->r_offset, 13620 ppc64_elf_howto_table[r_type]->name, 13621 sym_name); 13622 ret = FALSE; 13623 } 13624 else if (r_symndx == STN_UNDEF || bfd_is_abs_section (sec)) 13625 ; 13626 else if (sec == NULL || sec->owner == NULL) 13627 { 13628 bfd_set_error (bfd_error_bad_value); 13629 return FALSE; 13630 } 13631 else 13632 { 13633 asection *osec; 13634 13635 osec = sec->output_section; 13636 indx = elf_section_data (osec)->dynindx; 13637 13638 if (indx == 0) 13639 { 13640 if ((osec->flags & SEC_READONLY) == 0 13641 && htab->elf.data_index_section != NULL) 13642 osec = htab->elf.data_index_section; 13643 else 13644 osec = htab->elf.text_index_section; 13645 indx = elf_section_data (osec)->dynindx; 13646 } 13647 BFD_ASSERT (indx != 0); 13648 13649 /* We are turning this relocation into one 13650 against a section symbol, so subtract out 13651 the output section's address but not the 13652 offset of the input section in the output 13653 section. */ 13654 outrel.r_addend -= osec->vma; 13655 } 13656 13657 outrel.r_info = ELF64_R_INFO (indx, r_type); 13658 } 13659 } 13660 13661 sreloc = elf_section_data (input_section)->sreloc; 13662 if (!htab->elf.dynamic_sections_created) 13663 sreloc = htab->reliplt; 13664 if (sreloc == NULL) 13665 abort (); 13666 13667 if (sreloc->reloc_count * sizeof (Elf64_External_Rela) 13668 >= sreloc->size) 13669 abort (); 13670 loc = sreloc->contents; 13671 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 13672 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 13673 13674 /* If this reloc is against an external symbol, it will 13675 be computed at runtime, so there's no need to do 13676 anything now. However, for the sake of prelink ensure 13677 that the section contents are a known value. */ 13678 if (! relocate) 13679 { 13680 unresolved_reloc = FALSE; 13681 /* The value chosen here is quite arbitrary as ld.so 13682 ignores section contents except for the special 13683 case of .opd where the contents might be accessed 13684 before relocation. Choose zero, as that won't 13685 cause reloc overflow. */ 13686 relocation = 0; 13687 addend = 0; 13688 /* Use *r_offset == r_addend for R_PPC64_ADDR64 relocs 13689 to improve backward compatibility with older 13690 versions of ld. */ 13691 if (r_type == R_PPC64_ADDR64) 13692 addend = outrel.r_addend; 13693 /* Adjust pc_relative relocs to have zero in *r_offset. */ 13694 else if (ppc64_elf_howto_table[r_type]->pc_relative) 13695 addend = (input_section->output_section->vma 13696 + input_section->output_offset 13697 + rel->r_offset); 13698 } 13699 } 13700 break; 13701 13702 case R_PPC64_COPY: 13703 case R_PPC64_GLOB_DAT: 13704 case R_PPC64_JMP_SLOT: 13705 case R_PPC64_JMP_IREL: 13706 case R_PPC64_RELATIVE: 13707 /* We shouldn't ever see these dynamic relocs in relocatable 13708 files. */ 13709 /* Fall through. */ 13710 13711 case R_PPC64_PLTGOT16: 13712 case R_PPC64_PLTGOT16_DS: 13713 case R_PPC64_PLTGOT16_HA: 13714 case R_PPC64_PLTGOT16_HI: 13715 case R_PPC64_PLTGOT16_LO: 13716 case R_PPC64_PLTGOT16_LO_DS: 13717 case R_PPC64_PLTREL32: 13718 case R_PPC64_PLTREL64: 13719 /* These ones haven't been implemented yet. */ 13720 13721 info->callbacks->einfo 13722 (_("%P: %B: %s is not supported for `%T'\n"), 13723 input_bfd, 13724 ppc64_elf_howto_table[r_type]->name, sym_name); 13725 13726 bfd_set_error (bfd_error_invalid_operation); 13727 ret = FALSE; 13728 continue; 13729 } 13730 13731 /* Multi-instruction sequences that access the TOC can be 13732 optimized, eg. addis ra,r2,0; addi rb,ra,x; 13733 to nop; addi rb,r2,x; */ 13734 switch (r_type) 13735 { 13736 default: 13737 break; 13738 13739 case R_PPC64_GOT_TLSLD16_HI: 13740 case R_PPC64_GOT_TLSGD16_HI: 13741 case R_PPC64_GOT_TPREL16_HI: 13742 case R_PPC64_GOT_DTPREL16_HI: 13743 case R_PPC64_GOT16_HI: 13744 case R_PPC64_TOC16_HI: 13745 /* These relocs would only be useful if building up an 13746 offset to later add to r2, perhaps in an indexed 13747 addressing mode instruction. Don't try to optimize. 13748 Unfortunately, the possibility of someone building up an 13749 offset like this or even with the HA relocs, means that 13750 we need to check the high insn when optimizing the low 13751 insn. */ 13752 break; 13753 13754 case R_PPC64_GOT_TLSLD16_HA: 13755 case R_PPC64_GOT_TLSGD16_HA: 13756 case R_PPC64_GOT_TPREL16_HA: 13757 case R_PPC64_GOT_DTPREL16_HA: 13758 case R_PPC64_GOT16_HA: 13759 case R_PPC64_TOC16_HA: 13760 if (htab->do_toc_opt && relocation + addend + 0x8000 < 0x10000 13761 && !ppc64_elf_tdata (input_bfd)->unexpected_toc_insn) 13762 { 13763 bfd_byte *p = contents + (rel->r_offset & ~3); 13764 bfd_put_32 (input_bfd, NOP, p); 13765 } 13766 break; 13767 13768 case R_PPC64_GOT_TLSLD16_LO: 13769 case R_PPC64_GOT_TLSGD16_LO: 13770 case R_PPC64_GOT_TPREL16_LO_DS: 13771 case R_PPC64_GOT_DTPREL16_LO_DS: 13772 case R_PPC64_GOT16_LO: 13773 case R_PPC64_GOT16_LO_DS: 13774 case R_PPC64_TOC16_LO: 13775 case R_PPC64_TOC16_LO_DS: 13776 if (htab->do_toc_opt && relocation + addend + 0x8000 < 0x10000 13777 && !ppc64_elf_tdata (input_bfd)->unexpected_toc_insn) 13778 { 13779 bfd_byte *p = contents + (rel->r_offset & ~3); 13780 insn = bfd_get_32 (input_bfd, p); 13781 if ((insn & (0x3f << 26)) == 12u << 26 /* addic */) 13782 { 13783 /* Transform addic to addi when we change reg. */ 13784 insn &= ~((0x3f << 26) | (0x1f << 16)); 13785 insn |= (14u << 26) | (2 << 16); 13786 } 13787 else 13788 { 13789 insn &= ~(0x1f << 16); 13790 insn |= 2 << 16; 13791 } 13792 bfd_put_32 (input_bfd, insn, p); 13793 } 13794 break; 13795 } 13796 13797 /* Do any further special processing. */ 13798 switch (r_type) 13799 { 13800 default: 13801 break; 13802 13803 case R_PPC64_ADDR16_HA: 13804 case R_PPC64_REL16_HA: 13805 case R_PPC64_ADDR16_HIGHERA: 13806 case R_PPC64_ADDR16_HIGHESTA: 13807 case R_PPC64_TOC16_HA: 13808 case R_PPC64_SECTOFF_HA: 13809 case R_PPC64_TPREL16_HA: 13810 case R_PPC64_DTPREL16_HA: 13811 case R_PPC64_TPREL16_HIGHER: 13812 case R_PPC64_TPREL16_HIGHERA: 13813 case R_PPC64_TPREL16_HIGHEST: 13814 case R_PPC64_TPREL16_HIGHESTA: 13815 case R_PPC64_DTPREL16_HIGHER: 13816 case R_PPC64_DTPREL16_HIGHERA: 13817 case R_PPC64_DTPREL16_HIGHEST: 13818 case R_PPC64_DTPREL16_HIGHESTA: 13819 /* It's just possible that this symbol is a weak symbol 13820 that's not actually defined anywhere. In that case, 13821 'sec' would be NULL, and we should leave the symbol 13822 alone (it will be set to zero elsewhere in the link). */ 13823 if (sec == NULL) 13824 break; 13825 /* Fall thru */ 13826 13827 case R_PPC64_GOT16_HA: 13828 case R_PPC64_PLTGOT16_HA: 13829 case R_PPC64_PLT16_HA: 13830 case R_PPC64_GOT_TLSGD16_HA: 13831 case R_PPC64_GOT_TLSLD16_HA: 13832 case R_PPC64_GOT_TPREL16_HA: 13833 case R_PPC64_GOT_DTPREL16_HA: 13834 /* Add 0x10000 if sign bit in 0:15 is set. 13835 Bits 0:15 are not used. */ 13836 addend += 0x8000; 13837 break; 13838 13839 case R_PPC64_ADDR16_DS: 13840 case R_PPC64_ADDR16_LO_DS: 13841 case R_PPC64_GOT16_DS: 13842 case R_PPC64_GOT16_LO_DS: 13843 case R_PPC64_PLT16_LO_DS: 13844 case R_PPC64_SECTOFF_DS: 13845 case R_PPC64_SECTOFF_LO_DS: 13846 case R_PPC64_TOC16_DS: 13847 case R_PPC64_TOC16_LO_DS: 13848 case R_PPC64_PLTGOT16_DS: 13849 case R_PPC64_PLTGOT16_LO_DS: 13850 case R_PPC64_GOT_TPREL16_DS: 13851 case R_PPC64_GOT_TPREL16_LO_DS: 13852 case R_PPC64_GOT_DTPREL16_DS: 13853 case R_PPC64_GOT_DTPREL16_LO_DS: 13854 case R_PPC64_TPREL16_DS: 13855 case R_PPC64_TPREL16_LO_DS: 13856 case R_PPC64_DTPREL16_DS: 13857 case R_PPC64_DTPREL16_LO_DS: 13858 insn = bfd_get_32 (input_bfd, contents + (rel->r_offset & ~3)); 13859 mask = 3; 13860 /* If this reloc is against an lq insn, then the value must be 13861 a multiple of 16. This is somewhat of a hack, but the 13862 "correct" way to do this by defining _DQ forms of all the 13863 _DS relocs bloats all reloc switches in this file. It 13864 doesn't seem to make much sense to use any of these relocs 13865 in data, so testing the insn should be safe. */ 13866 if ((insn & (0x3f << 26)) == (56u << 26)) 13867 mask = 15; 13868 if (((relocation + addend) & mask) != 0) 13869 { 13870 info->callbacks->einfo 13871 (_("%P: %H: error: %s not a multiple of %u\n"), 13872 input_bfd, input_section, rel->r_offset, 13873 ppc64_elf_howto_table[r_type]->name, 13874 mask + 1); 13875 bfd_set_error (bfd_error_bad_value); 13876 ret = FALSE; 13877 continue; 13878 } 13879 break; 13880 } 13881 13882 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 13883 because such sections are not SEC_ALLOC and thus ld.so will 13884 not process them. */ 13885 if (unresolved_reloc 13886 && !((input_section->flags & SEC_DEBUGGING) != 0 13887 && h->elf.def_dynamic) 13888 && _bfd_elf_section_offset (output_bfd, info, input_section, 13889 rel->r_offset) != (bfd_vma) -1) 13890 { 13891 info->callbacks->einfo 13892 (_("%P: %H: unresolvable %s against `%T'\n"), 13893 input_bfd, input_section, rel->r_offset, 13894 ppc64_elf_howto_table[(int) r_type]->name, 13895 h->elf.root.root.string); 13896 ret = FALSE; 13897 } 13898 13899 r = _bfd_final_link_relocate (ppc64_elf_howto_table[(int) r_type], 13900 input_bfd, 13901 input_section, 13902 contents, 13903 rel->r_offset, 13904 relocation, 13905 addend); 13906 13907 if (r != bfd_reloc_ok) 13908 { 13909 char *more_info = NULL; 13910 const char *reloc_name = ppc64_elf_howto_table[r_type]->name; 13911 13912 if (reloc_dest != DEST_NORMAL) 13913 { 13914 more_info = bfd_malloc (strlen (reloc_name) + 8); 13915 if (more_info != NULL) 13916 { 13917 strcpy (more_info, reloc_name); 13918 strcat (more_info, (reloc_dest == DEST_OPD 13919 ? " (OPD)" : " (stub)")); 13920 reloc_name = more_info; 13921 } 13922 } 13923 13924 if (r == bfd_reloc_overflow) 13925 { 13926 if (warned) 13927 continue; 13928 if (h != NULL 13929 && h->elf.root.type == bfd_link_hash_undefweak 13930 && ppc64_elf_howto_table[r_type]->pc_relative) 13931 { 13932 /* Assume this is a call protected by other code that 13933 detects the symbol is undefined. If this is the case, 13934 we can safely ignore the overflow. If not, the 13935 program is hosed anyway, and a little warning isn't 13936 going to help. */ 13937 13938 continue; 13939 } 13940 13941 if (!((*info->callbacks->reloc_overflow) 13942 (info, &h->elf.root, sym_name, 13943 reloc_name, orig_rel.r_addend, 13944 input_bfd, input_section, rel->r_offset))) 13945 return FALSE; 13946 } 13947 else 13948 { 13949 info->callbacks->einfo 13950 (_("%P: %H: %s against `%T': error %d\n"), 13951 input_bfd, input_section, rel->r_offset, 13952 reloc_name, sym_name, (int) r); 13953 ret = FALSE; 13954 } 13955 if (more_info != NULL) 13956 free (more_info); 13957 } 13958 } 13959 13960 /* If we're emitting relocations, then shortly after this function 13961 returns, reloc offsets and addends for this section will be 13962 adjusted. Worse, reloc symbol indices will be for the output 13963 file rather than the input. Save a copy of the relocs for 13964 opd_entry_value. */ 13965 if (is_opd && (info->emitrelocations || info->relocatable)) 13966 { 13967 bfd_size_type amt; 13968 amt = input_section->reloc_count * sizeof (Elf_Internal_Rela); 13969 rel = bfd_alloc (input_bfd, amt); 13970 BFD_ASSERT (ppc64_elf_tdata (input_bfd)->opd_relocs == NULL); 13971 ppc64_elf_tdata (input_bfd)->opd_relocs = rel; 13972 if (rel == NULL) 13973 return FALSE; 13974 memcpy (rel, relocs, amt); 13975 } 13976 return ret; 13977 } 13978 13979 /* Adjust the value of any local symbols in opd sections. */ 13980 13981 static int 13982 ppc64_elf_output_symbol_hook (struct bfd_link_info *info, 13983 const char *name ATTRIBUTE_UNUSED, 13984 Elf_Internal_Sym *elfsym, 13985 asection *input_sec, 13986 struct elf_link_hash_entry *h) 13987 { 13988 struct _opd_sec_data *opd; 13989 long adjust; 13990 bfd_vma value; 13991 13992 if (h != NULL) 13993 return 1; 13994 13995 opd = get_opd_info (input_sec); 13996 if (opd == NULL || opd->adjust == NULL) 13997 return 1; 13998 13999 value = elfsym->st_value - input_sec->output_offset; 14000 if (!info->relocatable) 14001 value -= input_sec->output_section->vma; 14002 14003 adjust = opd->adjust[value / 8]; 14004 if (adjust == -1) 14005 return 2; 14006 14007 elfsym->st_value += adjust; 14008 return 1; 14009 } 14010 14011 /* Finish up dynamic symbol handling. We set the contents of various 14012 dynamic sections here. */ 14013 14014 static bfd_boolean 14015 ppc64_elf_finish_dynamic_symbol (bfd *output_bfd, 14016 struct bfd_link_info *info, 14017 struct elf_link_hash_entry *h, 14018 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED) 14019 { 14020 struct ppc_link_hash_table *htab; 14021 struct plt_entry *ent; 14022 Elf_Internal_Rela rela; 14023 bfd_byte *loc; 14024 14025 htab = ppc_hash_table (info); 14026 if (htab == NULL) 14027 return FALSE; 14028 14029 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 14030 if (ent->plt.offset != (bfd_vma) -1) 14031 { 14032 /* This symbol has an entry in the procedure linkage 14033 table. Set it up. */ 14034 if (!htab->elf.dynamic_sections_created 14035 || h->dynindx == -1) 14036 { 14037 BFD_ASSERT (h->type == STT_GNU_IFUNC 14038 && h->def_regular 14039 && (h->root.type == bfd_link_hash_defined 14040 || h->root.type == bfd_link_hash_defweak)); 14041 rela.r_offset = (htab->iplt->output_section->vma 14042 + htab->iplt->output_offset 14043 + ent->plt.offset); 14044 rela.r_info = ELF64_R_INFO (0, R_PPC64_JMP_IREL); 14045 rela.r_addend = (h->root.u.def.value 14046 + h->root.u.def.section->output_offset 14047 + h->root.u.def.section->output_section->vma 14048 + ent->addend); 14049 loc = (htab->reliplt->contents 14050 + (htab->reliplt->reloc_count++ 14051 * sizeof (Elf64_External_Rela))); 14052 } 14053 else 14054 { 14055 rela.r_offset = (htab->plt->output_section->vma 14056 + htab->plt->output_offset 14057 + ent->plt.offset); 14058 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_JMP_SLOT); 14059 rela.r_addend = ent->addend; 14060 loc = (htab->relplt->contents 14061 + ((ent->plt.offset - PLT_INITIAL_ENTRY_SIZE) 14062 / (PLT_ENTRY_SIZE / sizeof (Elf64_External_Rela)))); 14063 } 14064 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 14065 } 14066 14067 if (h->needs_copy) 14068 { 14069 /* This symbol needs a copy reloc. Set it up. */ 14070 14071 if (h->dynindx == -1 14072 || (h->root.type != bfd_link_hash_defined 14073 && h->root.type != bfd_link_hash_defweak) 14074 || htab->relbss == NULL) 14075 abort (); 14076 14077 rela.r_offset = (h->root.u.def.value 14078 + h->root.u.def.section->output_section->vma 14079 + h->root.u.def.section->output_offset); 14080 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_COPY); 14081 rela.r_addend = 0; 14082 loc = htab->relbss->contents; 14083 loc += htab->relbss->reloc_count++ * sizeof (Elf64_External_Rela); 14084 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 14085 } 14086 14087 return TRUE; 14088 } 14089 14090 /* Used to decide how to sort relocs in an optimal manner for the 14091 dynamic linker, before writing them out. */ 14092 14093 static enum elf_reloc_type_class 14094 ppc64_elf_reloc_type_class (const Elf_Internal_Rela *rela) 14095 { 14096 enum elf_ppc64_reloc_type r_type; 14097 14098 r_type = ELF64_R_TYPE (rela->r_info); 14099 switch (r_type) 14100 { 14101 case R_PPC64_RELATIVE: 14102 return reloc_class_relative; 14103 case R_PPC64_JMP_SLOT: 14104 return reloc_class_plt; 14105 case R_PPC64_COPY: 14106 return reloc_class_copy; 14107 default: 14108 return reloc_class_normal; 14109 } 14110 } 14111 14112 /* Finish up the dynamic sections. */ 14113 14114 static bfd_boolean 14115 ppc64_elf_finish_dynamic_sections (bfd *output_bfd, 14116 struct bfd_link_info *info) 14117 { 14118 struct ppc_link_hash_table *htab; 14119 bfd *dynobj; 14120 asection *sdyn; 14121 14122 htab = ppc_hash_table (info); 14123 if (htab == NULL) 14124 return FALSE; 14125 14126 dynobj = htab->elf.dynobj; 14127 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 14128 14129 if (htab->elf.dynamic_sections_created) 14130 { 14131 Elf64_External_Dyn *dyncon, *dynconend; 14132 14133 if (sdyn == NULL || htab->got == NULL) 14134 abort (); 14135 14136 dyncon = (Elf64_External_Dyn *) sdyn->contents; 14137 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 14138 for (; dyncon < dynconend; dyncon++) 14139 { 14140 Elf_Internal_Dyn dyn; 14141 asection *s; 14142 14143 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 14144 14145 switch (dyn.d_tag) 14146 { 14147 default: 14148 continue; 14149 14150 case DT_PPC64_GLINK: 14151 s = htab->glink; 14152 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 14153 /* We stupidly defined DT_PPC64_GLINK to be the start 14154 of glink rather than the first entry point, which is 14155 what ld.so needs, and now have a bigger stub to 14156 support automatic multiple TOCs. */ 14157 dyn.d_un.d_ptr += GLINK_CALL_STUB_SIZE - 32; 14158 break; 14159 14160 case DT_PPC64_OPD: 14161 s = bfd_get_section_by_name (output_bfd, ".opd"); 14162 if (s == NULL) 14163 continue; 14164 dyn.d_un.d_ptr = s->vma; 14165 break; 14166 14167 case DT_PPC64_OPDSZ: 14168 s = bfd_get_section_by_name (output_bfd, ".opd"); 14169 if (s == NULL) 14170 continue; 14171 dyn.d_un.d_val = s->size; 14172 break; 14173 14174 case DT_PLTGOT: 14175 s = htab->plt; 14176 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 14177 break; 14178 14179 case DT_JMPREL: 14180 s = htab->relplt; 14181 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 14182 break; 14183 14184 case DT_PLTRELSZ: 14185 dyn.d_un.d_val = htab->relplt->size; 14186 break; 14187 14188 case DT_RELASZ: 14189 /* Don't count procedure linkage table relocs in the 14190 overall reloc count. */ 14191 s = htab->relplt; 14192 if (s == NULL) 14193 continue; 14194 dyn.d_un.d_val -= s->size; 14195 break; 14196 14197 case DT_RELA: 14198 /* We may not be using the standard ELF linker script. 14199 If .rela.plt is the first .rela section, we adjust 14200 DT_RELA to not include it. */ 14201 s = htab->relplt; 14202 if (s == NULL) 14203 continue; 14204 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) 14205 continue; 14206 dyn.d_un.d_ptr += s->size; 14207 break; 14208 } 14209 14210 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 14211 } 14212 } 14213 14214 if (htab->got != NULL && htab->got->size != 0) 14215 { 14216 /* Fill in the first entry in the global offset table. 14217 We use it to hold the link-time TOCbase. */ 14218 bfd_put_64 (output_bfd, 14219 elf_gp (output_bfd) + TOC_BASE_OFF, 14220 htab->got->contents); 14221 14222 /* Set .got entry size. */ 14223 elf_section_data (htab->got->output_section)->this_hdr.sh_entsize = 8; 14224 } 14225 14226 if (htab->plt != NULL && htab->plt->size != 0) 14227 { 14228 /* Set .plt entry size. */ 14229 elf_section_data (htab->plt->output_section)->this_hdr.sh_entsize 14230 = PLT_ENTRY_SIZE; 14231 } 14232 14233 /* brlt is SEC_LINKER_CREATED, so we need to write out relocs for 14234 brlt ourselves if emitrelocations. */ 14235 if (htab->brlt != NULL 14236 && htab->brlt->reloc_count != 0 14237 && !_bfd_elf_link_output_relocs (output_bfd, 14238 htab->brlt, 14239 elf_section_data (htab->brlt)->rela.hdr, 14240 elf_section_data (htab->brlt)->relocs, 14241 NULL)) 14242 return FALSE; 14243 14244 if (htab->glink != NULL 14245 && htab->glink->reloc_count != 0 14246 && !_bfd_elf_link_output_relocs (output_bfd, 14247 htab->glink, 14248 elf_section_data (htab->glink)->rela.hdr, 14249 elf_section_data (htab->glink)->relocs, 14250 NULL)) 14251 return FALSE; 14252 14253 14254 if (htab->glink_eh_frame != NULL 14255 && htab->glink_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME 14256 && !_bfd_elf_write_section_eh_frame (output_bfd, info, 14257 htab->glink_eh_frame, 14258 htab->glink_eh_frame->contents)) 14259 return FALSE; 14260 14261 /* We need to handle writing out multiple GOT sections ourselves, 14262 since we didn't add them to DYNOBJ. We know dynobj is the first 14263 bfd. */ 14264 while ((dynobj = dynobj->link_next) != NULL) 14265 { 14266 asection *s; 14267 14268 if (!is_ppc64_elf (dynobj)) 14269 continue; 14270 14271 s = ppc64_elf_tdata (dynobj)->got; 14272 if (s != NULL 14273 && s->size != 0 14274 && s->output_section != bfd_abs_section_ptr 14275 && !bfd_set_section_contents (output_bfd, s->output_section, 14276 s->contents, s->output_offset, 14277 s->size)) 14278 return FALSE; 14279 s = ppc64_elf_tdata (dynobj)->relgot; 14280 if (s != NULL 14281 && s->size != 0 14282 && s->output_section != bfd_abs_section_ptr 14283 && !bfd_set_section_contents (output_bfd, s->output_section, 14284 s->contents, s->output_offset, 14285 s->size)) 14286 return FALSE; 14287 } 14288 14289 return TRUE; 14290 } 14291 14292 #include "elf64-target.h" 14293 14294 /* FreeBSD support */ 14295 14296 #undef TARGET_LITTLE_SYM 14297 #undef TARGET_LITTLE_NAME 14298 14299 #undef TARGET_BIG_SYM 14300 #define TARGET_BIG_SYM bfd_elf64_powerpc_freebsd_vec 14301 #undef TARGET_BIG_NAME 14302 #define TARGET_BIG_NAME "elf64-powerpc-freebsd" 14303 14304 #undef ELF_OSABI 14305 #define ELF_OSABI ELFOSABI_FREEBSD 14306 14307 #undef elf64_bed 14308 #define elf64_bed elf64_powerpc_fbsd_bed 14309 14310 #include "elf64-target.h" 14311 14312