1 /* Motorola 68k series support for 32-bit ELF 2 Copyright (C) 1993-2016 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 #include "sysdep.h" 22 #include "bfd.h" 23 #include "bfdlink.h" 24 #include "libbfd.h" 25 #include "elf-bfd.h" 26 #include "elf/m68k.h" 27 #include "opcode/m68k.h" 28 29 static bfd_boolean 30 elf_m68k_discard_copies (struct elf_link_hash_entry *, void *); 31 32 static reloc_howto_type howto_table[] = 33 { 34 HOWTO(R_68K_NONE, 0, 3, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE), 35 HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE), 36 HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE), 37 HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE), 38 HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE), 39 HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE), 40 HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE), 41 HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE), 42 HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE), 43 HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE), 44 HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE), 45 HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE), 46 HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE), 47 HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE), 48 HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE), 49 HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE), 50 HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE), 51 HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE), 52 HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE), 53 HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE), 54 HOWTO(R_68K_GLOB_DAT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", FALSE, 0, 0xffffffff,FALSE), 55 HOWTO(R_68K_JMP_SLOT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", FALSE, 0, 0xffffffff,FALSE), 56 HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE), 57 /* GNU extension to record C++ vtable hierarchy. */ 58 HOWTO (R_68K_GNU_VTINHERIT, /* type */ 59 0, /* rightshift */ 60 2, /* size (0 = byte, 1 = short, 2 = long) */ 61 0, /* bitsize */ 62 FALSE, /* pc_relative */ 63 0, /* bitpos */ 64 complain_overflow_dont, /* complain_on_overflow */ 65 NULL, /* special_function */ 66 "R_68K_GNU_VTINHERIT", /* name */ 67 FALSE, /* partial_inplace */ 68 0, /* src_mask */ 69 0, /* dst_mask */ 70 FALSE), 71 /* GNU extension to record C++ vtable member usage. */ 72 HOWTO (R_68K_GNU_VTENTRY, /* type */ 73 0, /* rightshift */ 74 2, /* size (0 = byte, 1 = short, 2 = long) */ 75 0, /* bitsize */ 76 FALSE, /* pc_relative */ 77 0, /* bitpos */ 78 complain_overflow_dont, /* complain_on_overflow */ 79 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 80 "R_68K_GNU_VTENTRY", /* name */ 81 FALSE, /* partial_inplace */ 82 0, /* src_mask */ 83 0, /* dst_mask */ 84 FALSE), 85 86 /* TLS general dynamic variable reference. */ 87 HOWTO (R_68K_TLS_GD32, /* type */ 88 0, /* rightshift */ 89 2, /* size (0 = byte, 1 = short, 2 = long) */ 90 32, /* bitsize */ 91 FALSE, /* pc_relative */ 92 0, /* bitpos */ 93 complain_overflow_bitfield, /* complain_on_overflow */ 94 bfd_elf_generic_reloc, /* special_function */ 95 "R_68K_TLS_GD32", /* name */ 96 FALSE, /* partial_inplace */ 97 0, /* src_mask */ 98 0xffffffff, /* dst_mask */ 99 FALSE), /* pcrel_offset */ 100 101 HOWTO (R_68K_TLS_GD16, /* type */ 102 0, /* rightshift */ 103 1, /* size (0 = byte, 1 = short, 2 = long) */ 104 16, /* bitsize */ 105 FALSE, /* pc_relative */ 106 0, /* bitpos */ 107 complain_overflow_signed, /* complain_on_overflow */ 108 bfd_elf_generic_reloc, /* special_function */ 109 "R_68K_TLS_GD16", /* name */ 110 FALSE, /* partial_inplace */ 111 0, /* src_mask */ 112 0x0000ffff, /* dst_mask */ 113 FALSE), /* pcrel_offset */ 114 115 HOWTO (R_68K_TLS_GD8, /* type */ 116 0, /* rightshift */ 117 0, /* size (0 = byte, 1 = short, 2 = long) */ 118 8, /* bitsize */ 119 FALSE, /* pc_relative */ 120 0, /* bitpos */ 121 complain_overflow_signed, /* complain_on_overflow */ 122 bfd_elf_generic_reloc, /* special_function */ 123 "R_68K_TLS_GD8", /* name */ 124 FALSE, /* partial_inplace */ 125 0, /* src_mask */ 126 0x000000ff, /* dst_mask */ 127 FALSE), /* pcrel_offset */ 128 129 /* TLS local dynamic variable reference. */ 130 HOWTO (R_68K_TLS_LDM32, /* type */ 131 0, /* rightshift */ 132 2, /* size (0 = byte, 1 = short, 2 = long) */ 133 32, /* bitsize */ 134 FALSE, /* pc_relative */ 135 0, /* bitpos */ 136 complain_overflow_bitfield, /* complain_on_overflow */ 137 bfd_elf_generic_reloc, /* special_function */ 138 "R_68K_TLS_LDM32", /* name */ 139 FALSE, /* partial_inplace */ 140 0, /* src_mask */ 141 0xffffffff, /* dst_mask */ 142 FALSE), /* pcrel_offset */ 143 144 HOWTO (R_68K_TLS_LDM16, /* type */ 145 0, /* rightshift */ 146 1, /* size (0 = byte, 1 = short, 2 = long) */ 147 16, /* bitsize */ 148 FALSE, /* pc_relative */ 149 0, /* bitpos */ 150 complain_overflow_signed, /* complain_on_overflow */ 151 bfd_elf_generic_reloc, /* special_function */ 152 "R_68K_TLS_LDM16", /* name */ 153 FALSE, /* partial_inplace */ 154 0, /* src_mask */ 155 0x0000ffff, /* dst_mask */ 156 FALSE), /* pcrel_offset */ 157 158 HOWTO (R_68K_TLS_LDM8, /* type */ 159 0, /* rightshift */ 160 0, /* size (0 = byte, 1 = short, 2 = long) */ 161 8, /* bitsize */ 162 FALSE, /* pc_relative */ 163 0, /* bitpos */ 164 complain_overflow_signed, /* complain_on_overflow */ 165 bfd_elf_generic_reloc, /* special_function */ 166 "R_68K_TLS_LDM8", /* name */ 167 FALSE, /* partial_inplace */ 168 0, /* src_mask */ 169 0x000000ff, /* dst_mask */ 170 FALSE), /* pcrel_offset */ 171 172 HOWTO (R_68K_TLS_LDO32, /* type */ 173 0, /* rightshift */ 174 2, /* size (0 = byte, 1 = short, 2 = long) */ 175 32, /* bitsize */ 176 FALSE, /* pc_relative */ 177 0, /* bitpos */ 178 complain_overflow_bitfield, /* complain_on_overflow */ 179 bfd_elf_generic_reloc, /* special_function */ 180 "R_68K_TLS_LDO32", /* name */ 181 FALSE, /* partial_inplace */ 182 0, /* src_mask */ 183 0xffffffff, /* dst_mask */ 184 FALSE), /* pcrel_offset */ 185 186 HOWTO (R_68K_TLS_LDO16, /* type */ 187 0, /* rightshift */ 188 1, /* size (0 = byte, 1 = short, 2 = long) */ 189 16, /* bitsize */ 190 FALSE, /* pc_relative */ 191 0, /* bitpos */ 192 complain_overflow_signed, /* complain_on_overflow */ 193 bfd_elf_generic_reloc, /* special_function */ 194 "R_68K_TLS_LDO16", /* name */ 195 FALSE, /* partial_inplace */ 196 0, /* src_mask */ 197 0x0000ffff, /* dst_mask */ 198 FALSE), /* pcrel_offset */ 199 200 HOWTO (R_68K_TLS_LDO8, /* type */ 201 0, /* rightshift */ 202 0, /* size (0 = byte, 1 = short, 2 = long) */ 203 8, /* bitsize */ 204 FALSE, /* pc_relative */ 205 0, /* bitpos */ 206 complain_overflow_signed, /* complain_on_overflow */ 207 bfd_elf_generic_reloc, /* special_function */ 208 "R_68K_TLS_LDO8", /* name */ 209 FALSE, /* partial_inplace */ 210 0, /* src_mask */ 211 0x000000ff, /* dst_mask */ 212 FALSE), /* pcrel_offset */ 213 214 /* TLS initial execution variable reference. */ 215 HOWTO (R_68K_TLS_IE32, /* type */ 216 0, /* rightshift */ 217 2, /* size (0 = byte, 1 = short, 2 = long) */ 218 32, /* bitsize */ 219 FALSE, /* pc_relative */ 220 0, /* bitpos */ 221 complain_overflow_bitfield, /* complain_on_overflow */ 222 bfd_elf_generic_reloc, /* special_function */ 223 "R_68K_TLS_IE32", /* name */ 224 FALSE, /* partial_inplace */ 225 0, /* src_mask */ 226 0xffffffff, /* dst_mask */ 227 FALSE), /* pcrel_offset */ 228 229 HOWTO (R_68K_TLS_IE16, /* type */ 230 0, /* rightshift */ 231 1, /* size (0 = byte, 1 = short, 2 = long) */ 232 16, /* bitsize */ 233 FALSE, /* pc_relative */ 234 0, /* bitpos */ 235 complain_overflow_signed, /* complain_on_overflow */ 236 bfd_elf_generic_reloc, /* special_function */ 237 "R_68K_TLS_IE16", /* name */ 238 FALSE, /* partial_inplace */ 239 0, /* src_mask */ 240 0x0000ffff, /* dst_mask */ 241 FALSE), /* pcrel_offset */ 242 243 HOWTO (R_68K_TLS_IE8, /* type */ 244 0, /* rightshift */ 245 0, /* size (0 = byte, 1 = short, 2 = long) */ 246 8, /* bitsize */ 247 FALSE, /* pc_relative */ 248 0, /* bitpos */ 249 complain_overflow_signed, /* complain_on_overflow */ 250 bfd_elf_generic_reloc, /* special_function */ 251 "R_68K_TLS_IE8", /* name */ 252 FALSE, /* partial_inplace */ 253 0, /* src_mask */ 254 0x000000ff, /* dst_mask */ 255 FALSE), /* pcrel_offset */ 256 257 /* TLS local execution variable reference. */ 258 HOWTO (R_68K_TLS_LE32, /* type */ 259 0, /* rightshift */ 260 2, /* size (0 = byte, 1 = short, 2 = long) */ 261 32, /* bitsize */ 262 FALSE, /* pc_relative */ 263 0, /* bitpos */ 264 complain_overflow_bitfield, /* complain_on_overflow */ 265 bfd_elf_generic_reloc, /* special_function */ 266 "R_68K_TLS_LE32", /* name */ 267 FALSE, /* partial_inplace */ 268 0, /* src_mask */ 269 0xffffffff, /* dst_mask */ 270 FALSE), /* pcrel_offset */ 271 272 HOWTO (R_68K_TLS_LE16, /* type */ 273 0, /* rightshift */ 274 1, /* size (0 = byte, 1 = short, 2 = long) */ 275 16, /* bitsize */ 276 FALSE, /* pc_relative */ 277 0, /* bitpos */ 278 complain_overflow_signed, /* complain_on_overflow */ 279 bfd_elf_generic_reloc, /* special_function */ 280 "R_68K_TLS_LE16", /* name */ 281 FALSE, /* partial_inplace */ 282 0, /* src_mask */ 283 0x0000ffff, /* dst_mask */ 284 FALSE), /* pcrel_offset */ 285 286 HOWTO (R_68K_TLS_LE8, /* type */ 287 0, /* rightshift */ 288 0, /* size (0 = byte, 1 = short, 2 = long) */ 289 8, /* bitsize */ 290 FALSE, /* pc_relative */ 291 0, /* bitpos */ 292 complain_overflow_signed, /* complain_on_overflow */ 293 bfd_elf_generic_reloc, /* special_function */ 294 "R_68K_TLS_LE8", /* name */ 295 FALSE, /* partial_inplace */ 296 0, /* src_mask */ 297 0x000000ff, /* dst_mask */ 298 FALSE), /* pcrel_offset */ 299 300 /* TLS GD/LD dynamic relocations. */ 301 HOWTO (R_68K_TLS_DTPMOD32, /* type */ 302 0, /* rightshift */ 303 2, /* size (0 = byte, 1 = short, 2 = long) */ 304 32, /* bitsize */ 305 FALSE, /* pc_relative */ 306 0, /* bitpos */ 307 complain_overflow_dont, /* complain_on_overflow */ 308 bfd_elf_generic_reloc, /* special_function */ 309 "R_68K_TLS_DTPMOD32", /* name */ 310 FALSE, /* partial_inplace */ 311 0, /* src_mask */ 312 0xffffffff, /* dst_mask */ 313 FALSE), /* pcrel_offset */ 314 315 HOWTO (R_68K_TLS_DTPREL32, /* type */ 316 0, /* rightshift */ 317 2, /* size (0 = byte, 1 = short, 2 = long) */ 318 32, /* bitsize */ 319 FALSE, /* pc_relative */ 320 0, /* bitpos */ 321 complain_overflow_dont, /* complain_on_overflow */ 322 bfd_elf_generic_reloc, /* special_function */ 323 "R_68K_TLS_DTPREL32", /* name */ 324 FALSE, /* partial_inplace */ 325 0, /* src_mask */ 326 0xffffffff, /* dst_mask */ 327 FALSE), /* pcrel_offset */ 328 329 HOWTO (R_68K_TLS_TPREL32, /* type */ 330 0, /* rightshift */ 331 2, /* size (0 = byte, 1 = short, 2 = long) */ 332 32, /* bitsize */ 333 FALSE, /* pc_relative */ 334 0, /* bitpos */ 335 complain_overflow_dont, /* complain_on_overflow */ 336 bfd_elf_generic_reloc, /* special_function */ 337 "R_68K_TLS_TPREL32", /* name */ 338 FALSE, /* partial_inplace */ 339 0, /* src_mask */ 340 0xffffffff, /* dst_mask */ 341 FALSE), /* pcrel_offset */ 342 }; 343 344 static void 345 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) 346 { 347 unsigned int indx = ELF32_R_TYPE (dst->r_info); 348 349 if (indx >= (unsigned int) R_68K_max) 350 { 351 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 352 abfd, (int) indx); 353 indx = R_68K_NONE; 354 } 355 cache_ptr->howto = &howto_table[indx]; 356 } 357 358 #define elf_info_to_howto rtype_to_howto 359 360 static const struct 361 { 362 bfd_reloc_code_real_type bfd_val; 363 int elf_val; 364 } 365 reloc_map[] = 366 { 367 { BFD_RELOC_NONE, R_68K_NONE }, 368 { BFD_RELOC_32, R_68K_32 }, 369 { BFD_RELOC_16, R_68K_16 }, 370 { BFD_RELOC_8, R_68K_8 }, 371 { BFD_RELOC_32_PCREL, R_68K_PC32 }, 372 { BFD_RELOC_16_PCREL, R_68K_PC16 }, 373 { BFD_RELOC_8_PCREL, R_68K_PC8 }, 374 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, 375 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, 376 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, 377 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, 378 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, 379 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, 380 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, 381 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, 382 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, 383 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, 384 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, 385 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, 386 { BFD_RELOC_NONE, R_68K_COPY }, 387 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, 388 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, 389 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, 390 { BFD_RELOC_CTOR, R_68K_32 }, 391 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, 392 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, 393 { BFD_RELOC_68K_TLS_GD32, R_68K_TLS_GD32 }, 394 { BFD_RELOC_68K_TLS_GD16, R_68K_TLS_GD16 }, 395 { BFD_RELOC_68K_TLS_GD8, R_68K_TLS_GD8 }, 396 { BFD_RELOC_68K_TLS_LDM32, R_68K_TLS_LDM32 }, 397 { BFD_RELOC_68K_TLS_LDM16, R_68K_TLS_LDM16 }, 398 { BFD_RELOC_68K_TLS_LDM8, R_68K_TLS_LDM8 }, 399 { BFD_RELOC_68K_TLS_LDO32, R_68K_TLS_LDO32 }, 400 { BFD_RELOC_68K_TLS_LDO16, R_68K_TLS_LDO16 }, 401 { BFD_RELOC_68K_TLS_LDO8, R_68K_TLS_LDO8 }, 402 { BFD_RELOC_68K_TLS_IE32, R_68K_TLS_IE32 }, 403 { BFD_RELOC_68K_TLS_IE16, R_68K_TLS_IE16 }, 404 { BFD_RELOC_68K_TLS_IE8, R_68K_TLS_IE8 }, 405 { BFD_RELOC_68K_TLS_LE32, R_68K_TLS_LE32 }, 406 { BFD_RELOC_68K_TLS_LE16, R_68K_TLS_LE16 }, 407 { BFD_RELOC_68K_TLS_LE8, R_68K_TLS_LE8 }, 408 }; 409 410 static reloc_howto_type * 411 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 412 bfd_reloc_code_real_type code) 413 { 414 unsigned int i; 415 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 416 { 417 if (reloc_map[i].bfd_val == code) 418 return &howto_table[reloc_map[i].elf_val]; 419 } 420 return 0; 421 } 422 423 static reloc_howto_type * 424 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) 425 { 426 unsigned int i; 427 428 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) 429 if (howto_table[i].name != NULL 430 && strcasecmp (howto_table[i].name, r_name) == 0) 431 return &howto_table[i]; 432 433 return NULL; 434 } 435 436 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 437 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup 438 #define ELF_ARCH bfd_arch_m68k 439 #define ELF_TARGET_ID M68K_ELF_DATA 440 441 /* Functions for the m68k ELF linker. */ 442 443 /* The name of the dynamic interpreter. This is put in the .interp 444 section. */ 445 446 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 447 448 /* Describes one of the various PLT styles. */ 449 450 struct elf_m68k_plt_info 451 { 452 /* The size of each PLT entry. */ 453 bfd_vma size; 454 455 /* The template for the first PLT entry. */ 456 const bfd_byte *plt0_entry; 457 458 /* Offsets of fields in PLT0_ENTRY that require R_68K_PC32 relocations. 459 The comments by each member indicate the value that the relocation 460 is against. */ 461 struct { 462 unsigned int got4; /* .got + 4 */ 463 unsigned int got8; /* .got + 8 */ 464 } plt0_relocs; 465 466 /* The template for a symbol's PLT entry. */ 467 const bfd_byte *symbol_entry; 468 469 /* Offsets of fields in SYMBOL_ENTRY that require R_68K_PC32 relocations. 470 The comments by each member indicate the value that the relocation 471 is against. */ 472 struct { 473 unsigned int got; /* the symbol's .got.plt entry */ 474 unsigned int plt; /* .plt */ 475 } symbol_relocs; 476 477 /* The offset of the resolver stub from the start of SYMBOL_ENTRY. 478 The stub starts with "move.l #relocoffset,%d0". */ 479 bfd_vma symbol_resolve_entry; 480 }; 481 482 /* The size in bytes of an entry in the procedure linkage table. */ 483 484 #define PLT_ENTRY_SIZE 20 485 486 /* The first entry in a procedure linkage table looks like this. See 487 the SVR4 ABI m68k supplement to see how this works. */ 488 489 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = 490 { 491 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 492 0, 0, 0, 2, /* + (.got + 4) - . */ 493 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ 494 0, 0, 0, 2, /* + (.got + 8) - . */ 495 0, 0, 0, 0 /* pad out to 20 bytes. */ 496 }; 497 498 /* Subsequent entries in a procedure linkage table look like this. */ 499 500 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = 501 { 502 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ 503 0, 0, 0, 2, /* + (.got.plt entry) - . */ 504 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 505 0, 0, 0, 0, /* + reloc index */ 506 0x60, 0xff, /* bra.l .plt */ 507 0, 0, 0, 0 /* + .plt - . */ 508 }; 509 510 static const struct elf_m68k_plt_info elf_m68k_plt_info = { 511 PLT_ENTRY_SIZE, 512 elf_m68k_plt0_entry, { 4, 12 }, 513 elf_m68k_plt_entry, { 4, 16 }, 8 514 }; 515 516 #define ISAB_PLT_ENTRY_SIZE 24 517 518 static const bfd_byte elf_isab_plt0_entry[ISAB_PLT_ENTRY_SIZE] = 519 { 520 0x20, 0x3c, /* move.l #offset,%d0 */ 521 0, 0, 0, 0, /* + (.got + 4) - . */ 522 0x2f, 0x3b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),-(%sp) */ 523 0x20, 0x3c, /* move.l #offset,%d0 */ 524 0, 0, 0, 0, /* + (.got + 8) - . */ 525 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 526 0x4e, 0xd0, /* jmp (%a0) */ 527 0x4e, 0x71 /* nop */ 528 }; 529 530 /* Subsequent entries in a procedure linkage table look like this. */ 531 532 static const bfd_byte elf_isab_plt_entry[ISAB_PLT_ENTRY_SIZE] = 533 { 534 0x20, 0x3c, /* move.l #offset,%d0 */ 535 0, 0, 0, 0, /* + (.got.plt entry) - . */ 536 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 537 0x4e, 0xd0, /* jmp (%a0) */ 538 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 539 0, 0, 0, 0, /* + reloc index */ 540 0x60, 0xff, /* bra.l .plt */ 541 0, 0, 0, 0 /* + .plt - . */ 542 }; 543 544 static const struct elf_m68k_plt_info elf_isab_plt_info = { 545 ISAB_PLT_ENTRY_SIZE, 546 elf_isab_plt0_entry, { 2, 12 }, 547 elf_isab_plt_entry, { 2, 20 }, 12 548 }; 549 550 #define ISAC_PLT_ENTRY_SIZE 24 551 552 static const bfd_byte elf_isac_plt0_entry[ISAC_PLT_ENTRY_SIZE] = 553 { 554 0x20, 0x3c, /* move.l #offset,%d0 */ 555 0, 0, 0, 0, /* replaced with .got + 4 - . */ 556 0x2e, 0xbb, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),(%sp) */ 557 0x20, 0x3c, /* move.l #offset,%d0 */ 558 0, 0, 0, 0, /* replaced with .got + 8 - . */ 559 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 560 0x4e, 0xd0, /* jmp (%a0) */ 561 0x4e, 0x71 /* nop */ 562 }; 563 564 /* Subsequent entries in a procedure linkage table look like this. */ 565 566 static const bfd_byte elf_isac_plt_entry[ISAC_PLT_ENTRY_SIZE] = 567 { 568 0x20, 0x3c, /* move.l #offset,%d0 */ 569 0, 0, 0, 0, /* replaced with (.got entry) - . */ 570 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 571 0x4e, 0xd0, /* jmp (%a0) */ 572 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 573 0, 0, 0, 0, /* replaced with offset into relocation table */ 574 0x61, 0xff, /* bsr.l .plt */ 575 0, 0, 0, 0 /* replaced with .plt - . */ 576 }; 577 578 static const struct elf_m68k_plt_info elf_isac_plt_info = { 579 ISAC_PLT_ENTRY_SIZE, 580 elf_isac_plt0_entry, { 2, 12}, 581 elf_isac_plt_entry, { 2, 20 }, 12 582 }; 583 584 #define CPU32_PLT_ENTRY_SIZE 24 585 /* Procedure linkage table entries for the cpu32 */ 586 static const bfd_byte elf_cpu32_plt0_entry[CPU32_PLT_ENTRY_SIZE] = 587 { 588 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 589 0, 0, 0, 2, /* + (.got + 4) - . */ 590 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 591 0, 0, 0, 2, /* + (.got + 8) - . */ 592 0x4e, 0xd1, /* jmp %a1@ */ 593 0, 0, 0, 0, /* pad out to 24 bytes. */ 594 0, 0 595 }; 596 597 static const bfd_byte elf_cpu32_plt_entry[CPU32_PLT_ENTRY_SIZE] = 598 { 599 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 600 0, 0, 0, 2, /* + (.got.plt entry) - . */ 601 0x4e, 0xd1, /* jmp %a1@ */ 602 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 603 0, 0, 0, 0, /* + reloc index */ 604 0x60, 0xff, /* bra.l .plt */ 605 0, 0, 0, 0, /* + .plt - . */ 606 0, 0 607 }; 608 609 static const struct elf_m68k_plt_info elf_cpu32_plt_info = { 610 CPU32_PLT_ENTRY_SIZE, 611 elf_cpu32_plt0_entry, { 4, 12 }, 612 elf_cpu32_plt_entry, { 4, 18 }, 10 613 }; 614 615 /* The m68k linker needs to keep track of the number of relocs that it 616 decides to copy in check_relocs for each symbol. This is so that it 617 can discard PC relative relocs if it doesn't need them when linking 618 with -Bsymbolic. We store the information in a field extending the 619 regular ELF linker hash table. */ 620 621 /* This structure keeps track of the number of PC relative relocs we have 622 copied for a given symbol. */ 623 624 struct elf_m68k_pcrel_relocs_copied 625 { 626 /* Next section. */ 627 struct elf_m68k_pcrel_relocs_copied *next; 628 /* A section in dynobj. */ 629 asection *section; 630 /* Number of relocs copied in this section. */ 631 bfd_size_type count; 632 }; 633 634 /* Forward declaration. */ 635 struct elf_m68k_got_entry; 636 637 /* m68k ELF linker hash entry. */ 638 639 struct elf_m68k_link_hash_entry 640 { 641 struct elf_link_hash_entry root; 642 643 /* Number of PC relative relocs copied for this symbol. */ 644 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; 645 646 /* Key to got_entries. */ 647 unsigned long got_entry_key; 648 649 /* List of GOT entries for this symbol. This list is build during 650 offset finalization and is used within elf_m68k_finish_dynamic_symbol 651 to traverse all GOT entries for a particular symbol. 652 653 ??? We could've used root.got.glist field instead, but having 654 a separate field is cleaner. */ 655 struct elf_m68k_got_entry *glist; 656 }; 657 658 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent)) 659 660 /* Key part of GOT entry in hashtable. */ 661 struct elf_m68k_got_entry_key 662 { 663 /* BFD in which this symbol was defined. NULL for global symbols. */ 664 const bfd *bfd; 665 666 /* Symbol index. Either local symbol index or h->got_entry_key. */ 667 unsigned long symndx; 668 669 /* Type is one of R_68K_GOT{8, 16, 32}O, R_68K_TLS_GD{8, 16, 32}, 670 R_68K_TLS_LDM{8, 16, 32} or R_68K_TLS_IE{8, 16, 32}. 671 672 From perspective of hashtable key, only elf_m68k_got_reloc_type (type) 673 matters. That is, we distinguish between, say, R_68K_GOT16O 674 and R_68K_GOT32O when allocating offsets, but they are considered to be 675 the same when searching got->entries. */ 676 enum elf_m68k_reloc_type type; 677 }; 678 679 /* Size of the GOT offset suitable for relocation. */ 680 enum elf_m68k_got_offset_size { R_8, R_16, R_32, R_LAST }; 681 682 /* Entry of the GOT. */ 683 struct elf_m68k_got_entry 684 { 685 /* GOT entries are put into a got->entries hashtable. This is the key. */ 686 struct elf_m68k_got_entry_key key_; 687 688 /* GOT entry data. We need s1 before offset finalization and s2 after. */ 689 union 690 { 691 struct 692 { 693 /* Number of times this entry is referenced. It is used to 694 filter out unnecessary GOT slots in elf_m68k_gc_sweep_hook. */ 695 bfd_vma refcount; 696 } s1; 697 698 struct 699 { 700 /* Offset from the start of .got section. To calculate offset relative 701 to GOT pointer one should substract got->offset from this value. */ 702 bfd_vma offset; 703 704 /* Pointer to the next GOT entry for this global symbol. 705 Symbols have at most one entry in one GOT, but might 706 have entries in more than one GOT. 707 Root of this list is h->glist. 708 NULL for local symbols. */ 709 struct elf_m68k_got_entry *next; 710 } s2; 711 } u; 712 }; 713 714 /* Return representative type for relocation R_TYPE. 715 This is used to avoid enumerating many relocations in comparisons, 716 switches etc. */ 717 718 static enum elf_m68k_reloc_type 719 elf_m68k_reloc_got_type (enum elf_m68k_reloc_type r_type) 720 { 721 switch (r_type) 722 { 723 /* In most cases R_68K_GOTx relocations require the very same 724 handling as R_68K_GOT32O relocation. In cases when we need 725 to distinguish between the two, we use explicitly compare against 726 r_type. */ 727 case R_68K_GOT32: 728 case R_68K_GOT16: 729 case R_68K_GOT8: 730 case R_68K_GOT32O: 731 case R_68K_GOT16O: 732 case R_68K_GOT8O: 733 return R_68K_GOT32O; 734 735 case R_68K_TLS_GD32: 736 case R_68K_TLS_GD16: 737 case R_68K_TLS_GD8: 738 return R_68K_TLS_GD32; 739 740 case R_68K_TLS_LDM32: 741 case R_68K_TLS_LDM16: 742 case R_68K_TLS_LDM8: 743 return R_68K_TLS_LDM32; 744 745 case R_68K_TLS_IE32: 746 case R_68K_TLS_IE16: 747 case R_68K_TLS_IE8: 748 return R_68K_TLS_IE32; 749 750 default: 751 BFD_ASSERT (FALSE); 752 return 0; 753 } 754 } 755 756 /* Return size of the GOT entry offset for relocation R_TYPE. */ 757 758 static enum elf_m68k_got_offset_size 759 elf_m68k_reloc_got_offset_size (enum elf_m68k_reloc_type r_type) 760 { 761 switch (r_type) 762 { 763 case R_68K_GOT32: case R_68K_GOT16: case R_68K_GOT8: 764 case R_68K_GOT32O: case R_68K_TLS_GD32: case R_68K_TLS_LDM32: 765 case R_68K_TLS_IE32: 766 return R_32; 767 768 case R_68K_GOT16O: case R_68K_TLS_GD16: case R_68K_TLS_LDM16: 769 case R_68K_TLS_IE16: 770 return R_16; 771 772 case R_68K_GOT8O: case R_68K_TLS_GD8: case R_68K_TLS_LDM8: 773 case R_68K_TLS_IE8: 774 return R_8; 775 776 default: 777 BFD_ASSERT (FALSE); 778 return 0; 779 } 780 } 781 782 /* Return number of GOT entries we need to allocate in GOT for 783 relocation R_TYPE. */ 784 785 static bfd_vma 786 elf_m68k_reloc_got_n_slots (enum elf_m68k_reloc_type r_type) 787 { 788 switch (elf_m68k_reloc_got_type (r_type)) 789 { 790 case R_68K_GOT32O: 791 case R_68K_TLS_IE32: 792 return 1; 793 794 case R_68K_TLS_GD32: 795 case R_68K_TLS_LDM32: 796 return 2; 797 798 default: 799 BFD_ASSERT (FALSE); 800 return 0; 801 } 802 } 803 804 /* Return TRUE if relocation R_TYPE is a TLS one. */ 805 806 static bfd_boolean 807 elf_m68k_reloc_tls_p (enum elf_m68k_reloc_type r_type) 808 { 809 switch (r_type) 810 { 811 case R_68K_TLS_GD32: case R_68K_TLS_GD16: case R_68K_TLS_GD8: 812 case R_68K_TLS_LDM32: case R_68K_TLS_LDM16: case R_68K_TLS_LDM8: 813 case R_68K_TLS_LDO32: case R_68K_TLS_LDO16: case R_68K_TLS_LDO8: 814 case R_68K_TLS_IE32: case R_68K_TLS_IE16: case R_68K_TLS_IE8: 815 case R_68K_TLS_LE32: case R_68K_TLS_LE16: case R_68K_TLS_LE8: 816 case R_68K_TLS_DTPMOD32: case R_68K_TLS_DTPREL32: case R_68K_TLS_TPREL32: 817 return TRUE; 818 819 default: 820 return FALSE; 821 } 822 } 823 824 /* Data structure representing a single GOT. */ 825 struct elf_m68k_got 826 { 827 /* Hashtable of 'struct elf_m68k_got_entry's. 828 Starting size of this table is the maximum number of 829 R_68K_GOT8O entries. */ 830 htab_t entries; 831 832 /* Number of R_x slots in this GOT. Some (e.g., TLS) entries require 833 several GOT slots. 834 835 n_slots[R_8] is the count of R_8 slots in this GOT. 836 n_slots[R_16] is the cumulative count of R_8 and R_16 slots 837 in this GOT. 838 n_slots[R_32] is the cumulative count of R_8, R_16 and R_32 slots 839 in this GOT. This is the total number of slots. */ 840 bfd_vma n_slots[R_LAST]; 841 842 /* Number of local (entry->key_.h == NULL) slots in this GOT. 843 This is only used to properly calculate size of .rela.got section; 844 see elf_m68k_partition_multi_got. */ 845 bfd_vma local_n_slots; 846 847 /* Offset of this GOT relative to beginning of .got section. */ 848 bfd_vma offset; 849 }; 850 851 /* BFD and its GOT. This is an entry in multi_got->bfd2got hashtable. */ 852 struct elf_m68k_bfd2got_entry 853 { 854 /* BFD. */ 855 const bfd *bfd; 856 857 /* Assigned GOT. Before partitioning multi-GOT each BFD has its own 858 GOT structure. After partitioning several BFD's might [and often do] 859 share a single GOT. */ 860 struct elf_m68k_got *got; 861 }; 862 863 /* The main data structure holding all the pieces. */ 864 struct elf_m68k_multi_got 865 { 866 /* Hashtable mapping each BFD to its GOT. If a BFD doesn't have an entry 867 here, then it doesn't need a GOT (this includes the case of a BFD 868 having an empty GOT). 869 870 ??? This hashtable can be replaced by an array indexed by bfd->id. */ 871 htab_t bfd2got; 872 873 /* Next symndx to assign a global symbol. 874 h->got_entry_key is initialized from this counter. */ 875 unsigned long global_symndx; 876 }; 877 878 /* m68k ELF linker hash table. */ 879 880 struct elf_m68k_link_hash_table 881 { 882 struct elf_link_hash_table root; 883 884 /* Small local sym cache. */ 885 struct sym_cache sym_cache; 886 887 /* The PLT format used by this link, or NULL if the format has not 888 yet been chosen. */ 889 const struct elf_m68k_plt_info *plt_info; 890 891 /* True, if GP is loaded within each function which uses it. 892 Set to TRUE when GOT negative offsets or multi-GOT is enabled. */ 893 bfd_boolean local_gp_p; 894 895 /* Switch controlling use of negative offsets to double the size of GOTs. */ 896 bfd_boolean use_neg_got_offsets_p; 897 898 /* Switch controlling generation of multiple GOTs. */ 899 bfd_boolean allow_multigot_p; 900 901 /* Multi-GOT data structure. */ 902 struct elf_m68k_multi_got multi_got_; 903 }; 904 905 /* Get the m68k ELF linker hash table from a link_info structure. */ 906 907 #define elf_m68k_hash_table(p) \ 908 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 909 == M68K_ELF_DATA ? ((struct elf_m68k_link_hash_table *) ((p)->hash)) : NULL) 910 911 /* Shortcut to multi-GOT data. */ 912 #define elf_m68k_multi_got(INFO) (&elf_m68k_hash_table (INFO)->multi_got_) 913 914 /* Create an entry in an m68k ELF linker hash table. */ 915 916 static struct bfd_hash_entry * 917 elf_m68k_link_hash_newfunc (struct bfd_hash_entry *entry, 918 struct bfd_hash_table *table, 919 const char *string) 920 { 921 struct bfd_hash_entry *ret = entry; 922 923 /* Allocate the structure if it has not already been allocated by a 924 subclass. */ 925 if (ret == NULL) 926 ret = bfd_hash_allocate (table, 927 sizeof (struct elf_m68k_link_hash_entry)); 928 if (ret == NULL) 929 return ret; 930 931 /* Call the allocation method of the superclass. */ 932 ret = _bfd_elf_link_hash_newfunc (ret, table, string); 933 if (ret != NULL) 934 { 935 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL; 936 elf_m68k_hash_entry (ret)->got_entry_key = 0; 937 elf_m68k_hash_entry (ret)->glist = NULL; 938 } 939 940 return ret; 941 } 942 943 /* Destroy an m68k ELF linker hash table. */ 944 945 static void 946 elf_m68k_link_hash_table_free (bfd *obfd) 947 { 948 struct elf_m68k_link_hash_table *htab; 949 950 htab = (struct elf_m68k_link_hash_table *) obfd->link.hash; 951 952 if (htab->multi_got_.bfd2got != NULL) 953 { 954 htab_delete (htab->multi_got_.bfd2got); 955 htab->multi_got_.bfd2got = NULL; 956 } 957 _bfd_elf_link_hash_table_free (obfd); 958 } 959 960 /* Create an m68k ELF linker hash table. */ 961 962 static struct bfd_link_hash_table * 963 elf_m68k_link_hash_table_create (bfd *abfd) 964 { 965 struct elf_m68k_link_hash_table *ret; 966 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table); 967 968 ret = (struct elf_m68k_link_hash_table *) bfd_zmalloc (amt); 969 if (ret == (struct elf_m68k_link_hash_table *) NULL) 970 return NULL; 971 972 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 973 elf_m68k_link_hash_newfunc, 974 sizeof (struct elf_m68k_link_hash_entry), 975 M68K_ELF_DATA)) 976 { 977 free (ret); 978 return NULL; 979 } 980 ret->root.root.hash_table_free = elf_m68k_link_hash_table_free; 981 982 ret->multi_got_.global_symndx = 1; 983 984 return &ret->root.root; 985 } 986 987 /* Set the right machine number. */ 988 989 static bfd_boolean 990 elf32_m68k_object_p (bfd *abfd) 991 { 992 unsigned int mach = 0; 993 unsigned features = 0; 994 flagword eflags = elf_elfheader (abfd)->e_flags; 995 996 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 997 features |= m68000; 998 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 999 features |= cpu32; 1000 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1001 features |= fido_a; 1002 else 1003 { 1004 switch (eflags & EF_M68K_CF_ISA_MASK) 1005 { 1006 case EF_M68K_CF_ISA_A_NODIV: 1007 features |= mcfisa_a; 1008 break; 1009 case EF_M68K_CF_ISA_A: 1010 features |= mcfisa_a|mcfhwdiv; 1011 break; 1012 case EF_M68K_CF_ISA_A_PLUS: 1013 features |= mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp; 1014 break; 1015 case EF_M68K_CF_ISA_B_NOUSP: 1016 features |= mcfisa_a|mcfisa_b|mcfhwdiv; 1017 break; 1018 case EF_M68K_CF_ISA_B: 1019 features |= mcfisa_a|mcfisa_b|mcfhwdiv|mcfusp; 1020 break; 1021 case EF_M68K_CF_ISA_C: 1022 features |= mcfisa_a|mcfisa_c|mcfhwdiv|mcfusp; 1023 break; 1024 case EF_M68K_CF_ISA_C_NODIV: 1025 features |= mcfisa_a|mcfisa_c|mcfusp; 1026 break; 1027 } 1028 switch (eflags & EF_M68K_CF_MAC_MASK) 1029 { 1030 case EF_M68K_CF_MAC: 1031 features |= mcfmac; 1032 break; 1033 case EF_M68K_CF_EMAC: 1034 features |= mcfemac; 1035 break; 1036 } 1037 if (eflags & EF_M68K_CF_FLOAT) 1038 features |= cfloat; 1039 } 1040 1041 mach = bfd_m68k_features_to_mach (features); 1042 bfd_default_set_arch_mach (abfd, bfd_arch_m68k, mach); 1043 1044 return TRUE; 1045 } 1046 1047 /* Somewhat reverse of elf32_m68k_object_p, this sets the e_flag 1048 field based on the machine number. */ 1049 1050 static void 1051 elf_m68k_final_write_processing (bfd *abfd, 1052 bfd_boolean linker ATTRIBUTE_UNUSED) 1053 { 1054 int mach = bfd_get_mach (abfd); 1055 unsigned long e_flags = elf_elfheader (abfd)->e_flags; 1056 1057 if (!e_flags) 1058 { 1059 unsigned int arch_mask; 1060 1061 arch_mask = bfd_m68k_mach_to_features (mach); 1062 1063 if (arch_mask & m68000) 1064 e_flags = EF_M68K_M68000; 1065 else if (arch_mask & cpu32) 1066 e_flags = EF_M68K_CPU32; 1067 else if (arch_mask & fido_a) 1068 e_flags = EF_M68K_FIDO; 1069 else 1070 { 1071 switch (arch_mask 1072 & (mcfisa_a | mcfisa_aa | mcfisa_b | mcfisa_c | mcfhwdiv | mcfusp)) 1073 { 1074 case mcfisa_a: 1075 e_flags |= EF_M68K_CF_ISA_A_NODIV; 1076 break; 1077 case mcfisa_a | mcfhwdiv: 1078 e_flags |= EF_M68K_CF_ISA_A; 1079 break; 1080 case mcfisa_a | mcfisa_aa | mcfhwdiv | mcfusp: 1081 e_flags |= EF_M68K_CF_ISA_A_PLUS; 1082 break; 1083 case mcfisa_a | mcfisa_b | mcfhwdiv: 1084 e_flags |= EF_M68K_CF_ISA_B_NOUSP; 1085 break; 1086 case mcfisa_a | mcfisa_b | mcfhwdiv | mcfusp: 1087 e_flags |= EF_M68K_CF_ISA_B; 1088 break; 1089 case mcfisa_a | mcfisa_c | mcfhwdiv | mcfusp: 1090 e_flags |= EF_M68K_CF_ISA_C; 1091 break; 1092 case mcfisa_a | mcfisa_c | mcfusp: 1093 e_flags |= EF_M68K_CF_ISA_C_NODIV; 1094 break; 1095 } 1096 if (arch_mask & mcfmac) 1097 e_flags |= EF_M68K_CF_MAC; 1098 else if (arch_mask & mcfemac) 1099 e_flags |= EF_M68K_CF_EMAC; 1100 if (arch_mask & cfloat) 1101 e_flags |= EF_M68K_CF_FLOAT | EF_M68K_CFV4E; 1102 } 1103 elf_elfheader (abfd)->e_flags = e_flags; 1104 } 1105 } 1106 1107 /* Keep m68k-specific flags in the ELF header. */ 1108 1109 static bfd_boolean 1110 elf32_m68k_set_private_flags (bfd *abfd, flagword flags) 1111 { 1112 elf_elfheader (abfd)->e_flags = flags; 1113 elf_flags_init (abfd) = TRUE; 1114 return TRUE; 1115 } 1116 1117 /* Merge backend specific data from an object file to the output 1118 object file when linking. */ 1119 static bfd_boolean 1120 elf32_m68k_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 1121 { 1122 flagword out_flags; 1123 flagword in_flags; 1124 flagword out_isa; 1125 flagword in_isa; 1126 const bfd_arch_info_type *arch_info; 1127 1128 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1129 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1130 return FALSE; 1131 1132 /* Get the merged machine. This checks for incompatibility between 1133 Coldfire & non-Coldfire flags, incompability between different 1134 Coldfire ISAs, and incompability between different MAC types. */ 1135 arch_info = bfd_arch_get_compatible (ibfd, obfd, FALSE); 1136 if (!arch_info) 1137 return FALSE; 1138 1139 bfd_set_arch_mach (obfd, bfd_arch_m68k, arch_info->mach); 1140 1141 in_flags = elf_elfheader (ibfd)->e_flags; 1142 if (!elf_flags_init (obfd)) 1143 { 1144 elf_flags_init (obfd) = TRUE; 1145 out_flags = in_flags; 1146 } 1147 else 1148 { 1149 out_flags = elf_elfheader (obfd)->e_flags; 1150 unsigned int variant_mask; 1151 1152 if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1153 variant_mask = 0; 1154 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1155 variant_mask = 0; 1156 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1157 variant_mask = 0; 1158 else 1159 variant_mask = EF_M68K_CF_ISA_MASK; 1160 1161 in_isa = (in_flags & variant_mask); 1162 out_isa = (out_flags & variant_mask); 1163 if (in_isa > out_isa) 1164 out_flags ^= in_isa ^ out_isa; 1165 if (((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32 1166 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1167 || ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO 1168 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32)) 1169 out_flags = EF_M68K_FIDO; 1170 else 1171 out_flags |= in_flags ^ in_isa; 1172 } 1173 elf_elfheader (obfd)->e_flags = out_flags; 1174 1175 return TRUE; 1176 } 1177 1178 /* Display the flags field. */ 1179 1180 static bfd_boolean 1181 elf32_m68k_print_private_bfd_data (bfd *abfd, void * ptr) 1182 { 1183 FILE *file = (FILE *) ptr; 1184 flagword eflags = elf_elfheader (abfd)->e_flags; 1185 1186 BFD_ASSERT (abfd != NULL && ptr != NULL); 1187 1188 /* Print normal ELF private data. */ 1189 _bfd_elf_print_private_bfd_data (abfd, ptr); 1190 1191 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 1192 1193 /* xgettext:c-format */ 1194 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 1195 1196 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1197 fprintf (file, " [m68000]"); 1198 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1199 fprintf (file, " [cpu32]"); 1200 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1201 fprintf (file, " [fido]"); 1202 else 1203 { 1204 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CFV4E) 1205 fprintf (file, " [cfv4e]"); 1206 1207 if (eflags & EF_M68K_CF_ISA_MASK) 1208 { 1209 char const *isa = _("unknown"); 1210 char const *mac = _("unknown"); 1211 char const *additional = ""; 1212 1213 switch (eflags & EF_M68K_CF_ISA_MASK) 1214 { 1215 case EF_M68K_CF_ISA_A_NODIV: 1216 isa = "A"; 1217 additional = " [nodiv]"; 1218 break; 1219 case EF_M68K_CF_ISA_A: 1220 isa = "A"; 1221 break; 1222 case EF_M68K_CF_ISA_A_PLUS: 1223 isa = "A+"; 1224 break; 1225 case EF_M68K_CF_ISA_B_NOUSP: 1226 isa = "B"; 1227 additional = " [nousp]"; 1228 break; 1229 case EF_M68K_CF_ISA_B: 1230 isa = "B"; 1231 break; 1232 case EF_M68K_CF_ISA_C: 1233 isa = "C"; 1234 break; 1235 case EF_M68K_CF_ISA_C_NODIV: 1236 isa = "C"; 1237 additional = " [nodiv]"; 1238 break; 1239 } 1240 fprintf (file, " [isa %s]%s", isa, additional); 1241 1242 if (eflags & EF_M68K_CF_FLOAT) 1243 fprintf (file, " [float]"); 1244 1245 switch (eflags & EF_M68K_CF_MAC_MASK) 1246 { 1247 case 0: 1248 mac = NULL; 1249 break; 1250 case EF_M68K_CF_MAC: 1251 mac = "mac"; 1252 break; 1253 case EF_M68K_CF_EMAC: 1254 mac = "emac"; 1255 break; 1256 case EF_M68K_CF_EMAC_B: 1257 mac = "emac_b"; 1258 break; 1259 } 1260 if (mac) 1261 fprintf (file, " [%s]", mac); 1262 } 1263 } 1264 1265 fputc ('\n', file); 1266 1267 return TRUE; 1268 } 1269 1270 /* Multi-GOT support implementation design: 1271 1272 Multi-GOT starts in check_relocs hook. There we scan all 1273 relocations of a BFD and build a local GOT (struct elf_m68k_got) 1274 for it. If a single BFD appears to require too many GOT slots with 1275 R_68K_GOT8O or R_68K_GOT16O relocations, we fail with notification 1276 to user. 1277 After check_relocs has been invoked for each input BFD, we have 1278 constructed a GOT for each input BFD. 1279 1280 To minimize total number of GOTs required for a particular output BFD 1281 (as some environments support only 1 GOT per output object) we try 1282 to merge some of the GOTs to share an offset space. Ideally [and in most 1283 cases] we end up with a single GOT. In cases when there are too many 1284 restricted relocations (e.g., R_68K_GOT16O relocations) we end up with 1285 several GOTs, assuming the environment can handle them. 1286 1287 Partitioning is done in elf_m68k_partition_multi_got. We start with 1288 an empty GOT and traverse bfd2got hashtable putting got_entries from 1289 local GOTs to the new 'big' one. We do that by constructing an 1290 intermediate GOT holding all the entries the local GOT has and the big 1291 GOT lacks. Then we check if there is room in the big GOT to accomodate 1292 all the entries from diff. On success we add those entries to the big 1293 GOT; on failure we start the new 'big' GOT and retry the adding of 1294 entries from the local GOT. Note that this retry will always succeed as 1295 each local GOT doesn't overflow the limits. After partitioning we 1296 end up with each bfd assigned one of the big GOTs. GOT entries in the 1297 big GOTs are initialized with GOT offsets. Note that big GOTs are 1298 positioned consequently in program space and represent a single huge GOT 1299 to the outside world. 1300 1301 After that we get to elf_m68k_relocate_section. There we 1302 adjust relocations of GOT pointer (_GLOBAL_OFFSET_TABLE_) and symbol 1303 relocations to refer to appropriate [assigned to current input_bfd] 1304 big GOT. 1305 1306 Notes: 1307 1308 GOT entry type: We have several types of GOT entries. 1309 * R_8 type is used in entries for symbols that have at least one 1310 R_68K_GOT8O or R_68K_TLS_*8 relocation. We can have at most 0x40 1311 such entries in one GOT. 1312 * R_16 type is used in entries for symbols that have at least one 1313 R_68K_GOT16O or R_68K_TLS_*16 relocation and no R_8 relocations. 1314 We can have at most 0x4000 such entries in one GOT. 1315 * R_32 type is used in all other cases. We can have as many 1316 such entries in one GOT as we'd like. 1317 When counting relocations we have to include the count of the smaller 1318 ranged relocations in the counts of the larger ranged ones in order 1319 to correctly detect overflow. 1320 1321 Sorting the GOT: In each GOT starting offsets are assigned to 1322 R_8 entries, which are followed by R_16 entries, and 1323 R_32 entries go at the end. See finalize_got_offsets for details. 1324 1325 Negative GOT offsets: To double usable offset range of GOTs we use 1326 negative offsets. As we assign entries with GOT offsets relative to 1327 start of .got section, the offset values are positive. They become 1328 negative only in relocate_section where got->offset value is 1329 subtracted from them. 1330 1331 3 special GOT entries: There are 3 special GOT entries used internally 1332 by loader. These entries happen to be placed to .got.plt section, 1333 so we don't do anything about them in multi-GOT support. 1334 1335 Memory management: All data except for hashtables 1336 multi_got->bfd2got and got->entries are allocated on 1337 elf_hash_table (info)->dynobj bfd (for this reason we pass 'info' 1338 to most functions), so we don't need to care to free them. At the 1339 moment of allocation hashtables are being linked into main data 1340 structure (multi_got), all pieces of which are reachable from 1341 elf_m68k_multi_got (info). We deallocate them in 1342 elf_m68k_link_hash_table_free. */ 1343 1344 /* Initialize GOT. */ 1345 1346 static void 1347 elf_m68k_init_got (struct elf_m68k_got *got) 1348 { 1349 got->entries = NULL; 1350 got->n_slots[R_8] = 0; 1351 got->n_slots[R_16] = 0; 1352 got->n_slots[R_32] = 0; 1353 got->local_n_slots = 0; 1354 got->offset = (bfd_vma) -1; 1355 } 1356 1357 /* Destruct GOT. */ 1358 1359 static void 1360 elf_m68k_clear_got (struct elf_m68k_got *got) 1361 { 1362 if (got->entries != NULL) 1363 { 1364 htab_delete (got->entries); 1365 got->entries = NULL; 1366 } 1367 } 1368 1369 /* Create and empty GOT structure. INFO is the context where memory 1370 should be allocated. */ 1371 1372 static struct elf_m68k_got * 1373 elf_m68k_create_empty_got (struct bfd_link_info *info) 1374 { 1375 struct elf_m68k_got *got; 1376 1377 got = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*got)); 1378 if (got == NULL) 1379 return NULL; 1380 1381 elf_m68k_init_got (got); 1382 1383 return got; 1384 } 1385 1386 /* Initialize KEY. */ 1387 1388 static void 1389 elf_m68k_init_got_entry_key (struct elf_m68k_got_entry_key *key, 1390 struct elf_link_hash_entry *h, 1391 const bfd *abfd, unsigned long symndx, 1392 enum elf_m68k_reloc_type reloc_type) 1393 { 1394 if (elf_m68k_reloc_got_type (reloc_type) == R_68K_TLS_LDM32) 1395 /* All TLS_LDM relocations share a single GOT entry. */ 1396 { 1397 key->bfd = NULL; 1398 key->symndx = 0; 1399 } 1400 else if (h != NULL) 1401 /* Global symbols are identified with their got_entry_key. */ 1402 { 1403 key->bfd = NULL; 1404 key->symndx = elf_m68k_hash_entry (h)->got_entry_key; 1405 BFD_ASSERT (key->symndx != 0); 1406 } 1407 else 1408 /* Local symbols are identified by BFD they appear in and symndx. */ 1409 { 1410 key->bfd = abfd; 1411 key->symndx = symndx; 1412 } 1413 1414 key->type = reloc_type; 1415 } 1416 1417 /* Calculate hash of got_entry. 1418 ??? Is it good? */ 1419 1420 static hashval_t 1421 elf_m68k_got_entry_hash (const void *_entry) 1422 { 1423 const struct elf_m68k_got_entry_key *key; 1424 1425 key = &((const struct elf_m68k_got_entry *) _entry)->key_; 1426 1427 return (key->symndx 1428 + (key->bfd != NULL ? (int) key->bfd->id : -1) 1429 + elf_m68k_reloc_got_type (key->type)); 1430 } 1431 1432 /* Check if two got entries are equal. */ 1433 1434 static int 1435 elf_m68k_got_entry_eq (const void *_entry1, const void *_entry2) 1436 { 1437 const struct elf_m68k_got_entry_key *key1; 1438 const struct elf_m68k_got_entry_key *key2; 1439 1440 key1 = &((const struct elf_m68k_got_entry *) _entry1)->key_; 1441 key2 = &((const struct elf_m68k_got_entry *) _entry2)->key_; 1442 1443 return (key1->bfd == key2->bfd 1444 && key1->symndx == key2->symndx 1445 && (elf_m68k_reloc_got_type (key1->type) 1446 == elf_m68k_reloc_got_type (key2->type))); 1447 } 1448 1449 /* When using negative offsets, we allocate one extra R_8, one extra R_16 1450 and one extra R_32 slots to simplify handling of 2-slot entries during 1451 offset allocation -- hence -1 for R_8 slots and -2 for R_16 slots. */ 1452 1453 /* Maximal number of R_8 slots in a single GOT. */ 1454 #define ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT(INFO) \ 1455 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1456 ? (0x40 - 1) \ 1457 : 0x20) 1458 1459 /* Maximal number of R_8 and R_16 slots in a single GOT. */ 1460 #define ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT(INFO) \ 1461 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1462 ? (0x4000 - 2) \ 1463 : 0x2000) 1464 1465 /* SEARCH - simply search the hashtable, don't insert new entries or fail when 1466 the entry cannot be found. 1467 FIND_OR_CREATE - search for an existing entry, but create new if there's 1468 no such. 1469 MUST_FIND - search for an existing entry and assert that it exist. 1470 MUST_CREATE - assert that there's no such entry and create new one. */ 1471 enum elf_m68k_get_entry_howto 1472 { 1473 SEARCH, 1474 FIND_OR_CREATE, 1475 MUST_FIND, 1476 MUST_CREATE 1477 }; 1478 1479 /* Get or create (depending on HOWTO) entry with KEY in GOT. 1480 INFO is context in which memory should be allocated (can be NULL if 1481 HOWTO is SEARCH or MUST_FIND). */ 1482 1483 static struct elf_m68k_got_entry * 1484 elf_m68k_get_got_entry (struct elf_m68k_got *got, 1485 const struct elf_m68k_got_entry_key *key, 1486 enum elf_m68k_get_entry_howto howto, 1487 struct bfd_link_info *info) 1488 { 1489 struct elf_m68k_got_entry entry_; 1490 struct elf_m68k_got_entry *entry; 1491 void **ptr; 1492 1493 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1494 1495 if (got->entries == NULL) 1496 /* This is the first entry in ABFD. Initialize hashtable. */ 1497 { 1498 if (howto == SEARCH) 1499 return NULL; 1500 1501 got->entries = htab_try_create (ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT 1502 (info), 1503 elf_m68k_got_entry_hash, 1504 elf_m68k_got_entry_eq, NULL); 1505 if (got->entries == NULL) 1506 { 1507 bfd_set_error (bfd_error_no_memory); 1508 return NULL; 1509 } 1510 } 1511 1512 entry_.key_ = *key; 1513 ptr = htab_find_slot (got->entries, &entry_, (howto != SEARCH 1514 ? INSERT : NO_INSERT)); 1515 if (ptr == NULL) 1516 { 1517 if (howto == SEARCH) 1518 /* Entry not found. */ 1519 return NULL; 1520 1521 /* We're out of memory. */ 1522 bfd_set_error (bfd_error_no_memory); 1523 return NULL; 1524 } 1525 1526 if (*ptr == NULL) 1527 /* We didn't find the entry and we're asked to create a new one. */ 1528 { 1529 BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); 1530 1531 entry = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry)); 1532 if (entry == NULL) 1533 return NULL; 1534 1535 /* Initialize new entry. */ 1536 entry->key_ = *key; 1537 1538 entry->u.s1.refcount = 0; 1539 1540 /* Mark the entry as not initialized. */ 1541 entry->key_.type = R_68K_max; 1542 1543 *ptr = entry; 1544 } 1545 else 1546 /* We found the entry. */ 1547 { 1548 BFD_ASSERT (howto != MUST_CREATE); 1549 1550 entry = *ptr; 1551 } 1552 1553 return entry; 1554 } 1555 1556 /* Update GOT counters when merging entry of WAS type with entry of NEW type. 1557 Return the value to which ENTRY's type should be set. */ 1558 1559 static enum elf_m68k_reloc_type 1560 elf_m68k_update_got_entry_type (struct elf_m68k_got *got, 1561 enum elf_m68k_reloc_type was, 1562 enum elf_m68k_reloc_type new_reloc) 1563 { 1564 enum elf_m68k_got_offset_size was_size; 1565 enum elf_m68k_got_offset_size new_size; 1566 bfd_vma n_slots; 1567 1568 if (was == R_68K_max) 1569 /* The type of the entry is not initialized yet. */ 1570 { 1571 /* Update all got->n_slots counters, including n_slots[R_32]. */ 1572 was_size = R_LAST; 1573 1574 was = new_reloc; 1575 } 1576 else 1577 { 1578 /* !!! We, probably, should emit an error rather then fail on assert 1579 in such a case. */ 1580 BFD_ASSERT (elf_m68k_reloc_got_type (was) 1581 == elf_m68k_reloc_got_type (new_reloc)); 1582 1583 was_size = elf_m68k_reloc_got_offset_size (was); 1584 } 1585 1586 new_size = elf_m68k_reloc_got_offset_size (new_reloc); 1587 n_slots = elf_m68k_reloc_got_n_slots (new_reloc); 1588 1589 while (was_size > new_size) 1590 { 1591 --was_size; 1592 got->n_slots[was_size] += n_slots; 1593 } 1594 1595 if (new_reloc > was) 1596 /* Relocations are ordered from bigger got offset size to lesser, 1597 so choose the relocation type with lesser offset size. */ 1598 was = new_reloc; 1599 1600 return was; 1601 } 1602 1603 /* Update GOT counters when removing an entry of type TYPE. */ 1604 1605 static void 1606 elf_m68k_remove_got_entry_type (struct elf_m68k_got *got, 1607 enum elf_m68k_reloc_type type) 1608 { 1609 enum elf_m68k_got_offset_size os; 1610 bfd_vma n_slots; 1611 1612 n_slots = elf_m68k_reloc_got_n_slots (type); 1613 1614 /* Decrese counter of slots with offset size corresponding to TYPE 1615 and all greater offset sizes. */ 1616 for (os = elf_m68k_reloc_got_offset_size (type); os <= R_32; ++os) 1617 { 1618 BFD_ASSERT (got->n_slots[os] >= n_slots); 1619 1620 got->n_slots[os] -= n_slots; 1621 } 1622 } 1623 1624 /* Add new or update existing entry to GOT. 1625 H, ABFD, TYPE and SYMNDX is data for the entry. 1626 INFO is a context where memory should be allocated. */ 1627 1628 static struct elf_m68k_got_entry * 1629 elf_m68k_add_entry_to_got (struct elf_m68k_got *got, 1630 struct elf_link_hash_entry *h, 1631 const bfd *abfd, 1632 enum elf_m68k_reloc_type reloc_type, 1633 unsigned long symndx, 1634 struct bfd_link_info *info) 1635 { 1636 struct elf_m68k_got_entry_key key_; 1637 struct elf_m68k_got_entry *entry; 1638 1639 if (h != NULL && elf_m68k_hash_entry (h)->got_entry_key == 0) 1640 elf_m68k_hash_entry (h)->got_entry_key 1641 = elf_m68k_multi_got (info)->global_symndx++; 1642 1643 elf_m68k_init_got_entry_key (&key_, h, abfd, symndx, reloc_type); 1644 1645 entry = elf_m68k_get_got_entry (got, &key_, FIND_OR_CREATE, info); 1646 if (entry == NULL) 1647 return NULL; 1648 1649 /* Determine entry's type and update got->n_slots counters. */ 1650 entry->key_.type = elf_m68k_update_got_entry_type (got, 1651 entry->key_.type, 1652 reloc_type); 1653 1654 /* Update refcount. */ 1655 ++entry->u.s1.refcount; 1656 1657 if (entry->u.s1.refcount == 1) 1658 /* We see this entry for the first time. */ 1659 { 1660 if (entry->key_.bfd != NULL) 1661 got->local_n_slots += elf_m68k_reloc_got_n_slots (entry->key_.type); 1662 } 1663 1664 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); 1665 1666 if ((got->n_slots[R_8] 1667 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1668 || (got->n_slots[R_16] 1669 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1670 /* This BFD has too many relocation. */ 1671 { 1672 if (got->n_slots[R_8] > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1673 (*_bfd_error_handler) (_("%B: GOT overflow: " 1674 "Number of relocations with 8-bit " 1675 "offset > %d"), 1676 abfd, 1677 ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)); 1678 else 1679 (*_bfd_error_handler) (_("%B: GOT overflow: " 1680 "Number of relocations with 8- or 16-bit " 1681 "offset > %d"), 1682 abfd, 1683 ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)); 1684 1685 return NULL; 1686 } 1687 1688 return entry; 1689 } 1690 1691 /* Compute the hash value of the bfd in a bfd2got hash entry. */ 1692 1693 static hashval_t 1694 elf_m68k_bfd2got_entry_hash (const void *entry) 1695 { 1696 const struct elf_m68k_bfd2got_entry *e; 1697 1698 e = (const struct elf_m68k_bfd2got_entry *) entry; 1699 1700 return e->bfd->id; 1701 } 1702 1703 /* Check whether two hash entries have the same bfd. */ 1704 1705 static int 1706 elf_m68k_bfd2got_entry_eq (const void *entry1, const void *entry2) 1707 { 1708 const struct elf_m68k_bfd2got_entry *e1; 1709 const struct elf_m68k_bfd2got_entry *e2; 1710 1711 e1 = (const struct elf_m68k_bfd2got_entry *) entry1; 1712 e2 = (const struct elf_m68k_bfd2got_entry *) entry2; 1713 1714 return e1->bfd == e2->bfd; 1715 } 1716 1717 /* Destruct a bfd2got entry. */ 1718 1719 static void 1720 elf_m68k_bfd2got_entry_del (void *_entry) 1721 { 1722 struct elf_m68k_bfd2got_entry *entry; 1723 1724 entry = (struct elf_m68k_bfd2got_entry *) _entry; 1725 1726 BFD_ASSERT (entry->got != NULL); 1727 elf_m68k_clear_got (entry->got); 1728 } 1729 1730 /* Find existing or create new (depending on HOWTO) bfd2got entry in 1731 MULTI_GOT. ABFD is the bfd we need a GOT for. INFO is a context where 1732 memory should be allocated. */ 1733 1734 static struct elf_m68k_bfd2got_entry * 1735 elf_m68k_get_bfd2got_entry (struct elf_m68k_multi_got *multi_got, 1736 const bfd *abfd, 1737 enum elf_m68k_get_entry_howto howto, 1738 struct bfd_link_info *info) 1739 { 1740 struct elf_m68k_bfd2got_entry entry_; 1741 void **ptr; 1742 struct elf_m68k_bfd2got_entry *entry; 1743 1744 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1745 1746 if (multi_got->bfd2got == NULL) 1747 /* This is the first GOT. Initialize bfd2got. */ 1748 { 1749 if (howto == SEARCH) 1750 return NULL; 1751 1752 multi_got->bfd2got = htab_try_create (1, elf_m68k_bfd2got_entry_hash, 1753 elf_m68k_bfd2got_entry_eq, 1754 elf_m68k_bfd2got_entry_del); 1755 if (multi_got->bfd2got == NULL) 1756 { 1757 bfd_set_error (bfd_error_no_memory); 1758 return NULL; 1759 } 1760 } 1761 1762 entry_.bfd = abfd; 1763 ptr = htab_find_slot (multi_got->bfd2got, &entry_, (howto != SEARCH 1764 ? INSERT : NO_INSERT)); 1765 if (ptr == NULL) 1766 { 1767 if (howto == SEARCH) 1768 /* Entry not found. */ 1769 return NULL; 1770 1771 /* We're out of memory. */ 1772 bfd_set_error (bfd_error_no_memory); 1773 return NULL; 1774 } 1775 1776 if (*ptr == NULL) 1777 /* Entry was not found. Create new one. */ 1778 { 1779 BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); 1780 1781 entry = ((struct elf_m68k_bfd2got_entry *) 1782 bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry))); 1783 if (entry == NULL) 1784 return NULL; 1785 1786 entry->bfd = abfd; 1787 1788 entry->got = elf_m68k_create_empty_got (info); 1789 if (entry->got == NULL) 1790 return NULL; 1791 1792 *ptr = entry; 1793 } 1794 else 1795 { 1796 BFD_ASSERT (howto != MUST_CREATE); 1797 1798 /* Return existing entry. */ 1799 entry = *ptr; 1800 } 1801 1802 return entry; 1803 } 1804 1805 struct elf_m68k_can_merge_gots_arg 1806 { 1807 /* A current_got that we constructing a DIFF against. */ 1808 struct elf_m68k_got *big; 1809 1810 /* GOT holding entries not present or that should be changed in 1811 BIG. */ 1812 struct elf_m68k_got *diff; 1813 1814 /* Context where to allocate memory. */ 1815 struct bfd_link_info *info; 1816 1817 /* Error flag. */ 1818 bfd_boolean error_p; 1819 }; 1820 1821 /* Process a single entry from the small GOT to see if it should be added 1822 or updated in the big GOT. */ 1823 1824 static int 1825 elf_m68k_can_merge_gots_1 (void **_entry_ptr, void *_arg) 1826 { 1827 const struct elf_m68k_got_entry *entry1; 1828 struct elf_m68k_can_merge_gots_arg *arg; 1829 const struct elf_m68k_got_entry *entry2; 1830 enum elf_m68k_reloc_type type; 1831 1832 entry1 = (const struct elf_m68k_got_entry *) *_entry_ptr; 1833 arg = (struct elf_m68k_can_merge_gots_arg *) _arg; 1834 1835 entry2 = elf_m68k_get_got_entry (arg->big, &entry1->key_, SEARCH, NULL); 1836 1837 if (entry2 != NULL) 1838 /* We found an existing entry. Check if we should update it. */ 1839 { 1840 type = elf_m68k_update_got_entry_type (arg->diff, 1841 entry2->key_.type, 1842 entry1->key_.type); 1843 1844 if (type == entry2->key_.type) 1845 /* ENTRY1 doesn't update data in ENTRY2. Skip it. 1846 To skip creation of difference entry we use the type, 1847 which we won't see in GOT entries for sure. */ 1848 type = R_68K_max; 1849 } 1850 else 1851 /* We didn't find the entry. Add entry1 to DIFF. */ 1852 { 1853 BFD_ASSERT (entry1->key_.type != R_68K_max); 1854 1855 type = elf_m68k_update_got_entry_type (arg->diff, 1856 R_68K_max, entry1->key_.type); 1857 1858 if (entry1->key_.bfd != NULL) 1859 arg->diff->local_n_slots += elf_m68k_reloc_got_n_slots (type); 1860 } 1861 1862 if (type != R_68K_max) 1863 /* Create an entry in DIFF. */ 1864 { 1865 struct elf_m68k_got_entry *entry; 1866 1867 entry = elf_m68k_get_got_entry (arg->diff, &entry1->key_, MUST_CREATE, 1868 arg->info); 1869 if (entry == NULL) 1870 { 1871 arg->error_p = TRUE; 1872 return 0; 1873 } 1874 1875 entry->key_.type = type; 1876 } 1877 1878 return 1; 1879 } 1880 1881 /* Return TRUE if SMALL GOT can be added to BIG GOT without overflowing it. 1882 Construct DIFF GOT holding the entries which should be added or updated 1883 in BIG GOT to accumulate information from SMALL. 1884 INFO is the context where memory should be allocated. */ 1885 1886 static bfd_boolean 1887 elf_m68k_can_merge_gots (struct elf_m68k_got *big, 1888 const struct elf_m68k_got *small, 1889 struct bfd_link_info *info, 1890 struct elf_m68k_got *diff) 1891 { 1892 struct elf_m68k_can_merge_gots_arg arg_; 1893 1894 BFD_ASSERT (small->offset == (bfd_vma) -1); 1895 1896 arg_.big = big; 1897 arg_.diff = diff; 1898 arg_.info = info; 1899 arg_.error_p = FALSE; 1900 htab_traverse_noresize (small->entries, elf_m68k_can_merge_gots_1, &arg_); 1901 if (arg_.error_p) 1902 { 1903 diff->offset = 0; 1904 return FALSE; 1905 } 1906 1907 /* Check for overflow. */ 1908 if ((big->n_slots[R_8] + arg_.diff->n_slots[R_8] 1909 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1910 || (big->n_slots[R_16] + arg_.diff->n_slots[R_16] 1911 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1912 return FALSE; 1913 1914 return TRUE; 1915 } 1916 1917 struct elf_m68k_merge_gots_arg 1918 { 1919 /* The BIG got. */ 1920 struct elf_m68k_got *big; 1921 1922 /* Context where memory should be allocated. */ 1923 struct bfd_link_info *info; 1924 1925 /* Error flag. */ 1926 bfd_boolean error_p; 1927 }; 1928 1929 /* Process a single entry from DIFF got. Add or update corresponding 1930 entry in the BIG got. */ 1931 1932 static int 1933 elf_m68k_merge_gots_1 (void **entry_ptr, void *_arg) 1934 { 1935 const struct elf_m68k_got_entry *from; 1936 struct elf_m68k_merge_gots_arg *arg; 1937 struct elf_m68k_got_entry *to; 1938 1939 from = (const struct elf_m68k_got_entry *) *entry_ptr; 1940 arg = (struct elf_m68k_merge_gots_arg *) _arg; 1941 1942 to = elf_m68k_get_got_entry (arg->big, &from->key_, FIND_OR_CREATE, 1943 arg->info); 1944 if (to == NULL) 1945 { 1946 arg->error_p = TRUE; 1947 return 0; 1948 } 1949 1950 BFD_ASSERT (to->u.s1.refcount == 0); 1951 /* All we need to merge is TYPE. */ 1952 to->key_.type = from->key_.type; 1953 1954 return 1; 1955 } 1956 1957 /* Merge data from DIFF to BIG. INFO is context where memory should be 1958 allocated. */ 1959 1960 static bfd_boolean 1961 elf_m68k_merge_gots (struct elf_m68k_got *big, 1962 struct elf_m68k_got *diff, 1963 struct bfd_link_info *info) 1964 { 1965 if (diff->entries != NULL) 1966 /* DIFF is not empty. Merge it into BIG GOT. */ 1967 { 1968 struct elf_m68k_merge_gots_arg arg_; 1969 1970 /* Merge entries. */ 1971 arg_.big = big; 1972 arg_.info = info; 1973 arg_.error_p = FALSE; 1974 htab_traverse_noresize (diff->entries, elf_m68k_merge_gots_1, &arg_); 1975 if (arg_.error_p) 1976 return FALSE; 1977 1978 /* Merge counters. */ 1979 big->n_slots[R_8] += diff->n_slots[R_8]; 1980 big->n_slots[R_16] += diff->n_slots[R_16]; 1981 big->n_slots[R_32] += diff->n_slots[R_32]; 1982 big->local_n_slots += diff->local_n_slots; 1983 } 1984 else 1985 /* DIFF is empty. */ 1986 { 1987 BFD_ASSERT (diff->n_slots[R_8] == 0); 1988 BFD_ASSERT (diff->n_slots[R_16] == 0); 1989 BFD_ASSERT (diff->n_slots[R_32] == 0); 1990 BFD_ASSERT (diff->local_n_slots == 0); 1991 } 1992 1993 BFD_ASSERT (!elf_m68k_hash_table (info)->allow_multigot_p 1994 || ((big->n_slots[R_8] 1995 <= ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1996 && (big->n_slots[R_16] 1997 <= ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)))); 1998 1999 return TRUE; 2000 } 2001 2002 struct elf_m68k_finalize_got_offsets_arg 2003 { 2004 /* Ranges of the offsets for GOT entries. 2005 R_x entries receive offsets between offset1[R_x] and offset2[R_x]. 2006 R_x is R_8, R_16 and R_32. */ 2007 bfd_vma *offset1; 2008 bfd_vma *offset2; 2009 2010 /* Mapping from global symndx to global symbols. 2011 This is used to build lists of got entries for global symbols. */ 2012 struct elf_m68k_link_hash_entry **symndx2h; 2013 2014 bfd_vma n_ldm_entries; 2015 }; 2016 2017 /* Assign ENTRY an offset. Build list of GOT entries for global symbols 2018 along the way. */ 2019 2020 static int 2021 elf_m68k_finalize_got_offsets_1 (void **entry_ptr, void *_arg) 2022 { 2023 struct elf_m68k_got_entry *entry; 2024 struct elf_m68k_finalize_got_offsets_arg *arg; 2025 2026 enum elf_m68k_got_offset_size got_offset_size; 2027 bfd_vma entry_size; 2028 2029 entry = (struct elf_m68k_got_entry *) *entry_ptr; 2030 arg = (struct elf_m68k_finalize_got_offsets_arg *) _arg; 2031 2032 /* This should be a fresh entry created in elf_m68k_can_merge_gots. */ 2033 BFD_ASSERT (entry->u.s1.refcount == 0); 2034 2035 /* Get GOT offset size for the entry . */ 2036 got_offset_size = elf_m68k_reloc_got_offset_size (entry->key_.type); 2037 2038 /* Calculate entry size in bytes. */ 2039 entry_size = 4 * elf_m68k_reloc_got_n_slots (entry->key_.type); 2040 2041 /* Check if we should switch to negative range of the offsets. */ 2042 if (arg->offset1[got_offset_size] + entry_size 2043 > arg->offset2[got_offset_size]) 2044 { 2045 /* Verify that this is the only switch to negative range for 2046 got_offset_size. If this assertion fails, then we've miscalculated 2047 range for got_offset_size entries in 2048 elf_m68k_finalize_got_offsets. */ 2049 BFD_ASSERT (arg->offset2[got_offset_size] 2050 != arg->offset2[-(int) got_offset_size - 1]); 2051 2052 /* Switch. */ 2053 arg->offset1[got_offset_size] = arg->offset1[-(int) got_offset_size - 1]; 2054 arg->offset2[got_offset_size] = arg->offset2[-(int) got_offset_size - 1]; 2055 2056 /* Verify that now we have enough room for the entry. */ 2057 BFD_ASSERT (arg->offset1[got_offset_size] + entry_size 2058 <= arg->offset2[got_offset_size]); 2059 } 2060 2061 /* Assign offset to entry. */ 2062 entry->u.s2.offset = arg->offset1[got_offset_size]; 2063 arg->offset1[got_offset_size] += entry_size; 2064 2065 if (entry->key_.bfd == NULL) 2066 /* Hook up this entry into the list of got_entries of H. */ 2067 { 2068 struct elf_m68k_link_hash_entry *h; 2069 2070 h = arg->symndx2h[entry->key_.symndx]; 2071 if (h != NULL) 2072 { 2073 entry->u.s2.next = h->glist; 2074 h->glist = entry; 2075 } 2076 else 2077 /* This should be the entry for TLS_LDM relocation then. */ 2078 { 2079 BFD_ASSERT ((elf_m68k_reloc_got_type (entry->key_.type) 2080 == R_68K_TLS_LDM32) 2081 && entry->key_.symndx == 0); 2082 2083 ++arg->n_ldm_entries; 2084 } 2085 } 2086 else 2087 /* This entry is for local symbol. */ 2088 entry->u.s2.next = NULL; 2089 2090 return 1; 2091 } 2092 2093 /* Assign offsets within GOT. USE_NEG_GOT_OFFSETS_P indicates if we 2094 should use negative offsets. 2095 Build list of GOT entries for global symbols along the way. 2096 SYMNDX2H is mapping from global symbol indices to actual 2097 global symbols. 2098 Return offset at which next GOT should start. */ 2099 2100 static void 2101 elf_m68k_finalize_got_offsets (struct elf_m68k_got *got, 2102 bfd_boolean use_neg_got_offsets_p, 2103 struct elf_m68k_link_hash_entry **symndx2h, 2104 bfd_vma *final_offset, bfd_vma *n_ldm_entries) 2105 { 2106 struct elf_m68k_finalize_got_offsets_arg arg_; 2107 bfd_vma offset1_[2 * R_LAST]; 2108 bfd_vma offset2_[2 * R_LAST]; 2109 int i; 2110 bfd_vma start_offset; 2111 2112 BFD_ASSERT (got->offset != (bfd_vma) -1); 2113 2114 /* We set entry offsets relative to the .got section (and not the 2115 start of a particular GOT), so that we can use them in 2116 finish_dynamic_symbol without needing to know the GOT which they come 2117 from. */ 2118 2119 /* Put offset1 in the middle of offset1_, same for offset2. */ 2120 arg_.offset1 = offset1_ + R_LAST; 2121 arg_.offset2 = offset2_ + R_LAST; 2122 2123 start_offset = got->offset; 2124 2125 if (use_neg_got_offsets_p) 2126 /* Setup both negative and positive ranges for R_8, R_16 and R_32. */ 2127 i = -(int) R_32 - 1; 2128 else 2129 /* Setup positives ranges for R_8, R_16 and R_32. */ 2130 i = (int) R_8; 2131 2132 for (; i <= (int) R_32; ++i) 2133 { 2134 int j; 2135 size_t n; 2136 2137 /* Set beginning of the range of offsets I. */ 2138 arg_.offset1[i] = start_offset; 2139 2140 /* Calculate number of slots that require I offsets. */ 2141 j = (i >= 0) ? i : -i - 1; 2142 n = (j >= 1) ? got->n_slots[j - 1] : 0; 2143 n = got->n_slots[j] - n; 2144 2145 if (use_neg_got_offsets_p && n != 0) 2146 { 2147 if (i < 0) 2148 /* We first fill the positive side of the range, so we might 2149 end up with one empty slot at that side when we can't fit 2150 whole 2-slot entry. Account for that at negative side of 2151 the interval with one additional entry. */ 2152 n = n / 2 + 1; 2153 else 2154 /* When the number of slots is odd, make positive side of the 2155 range one entry bigger. */ 2156 n = (n + 1) / 2; 2157 } 2158 2159 /* N is the number of slots that require I offsets. 2160 Calculate length of the range for I offsets. */ 2161 n = 4 * n; 2162 2163 /* Set end of the range. */ 2164 arg_.offset2[i] = start_offset + n; 2165 2166 start_offset = arg_.offset2[i]; 2167 } 2168 2169 if (!use_neg_got_offsets_p) 2170 /* Make sure that if we try to switch to negative offsets in 2171 elf_m68k_finalize_got_offsets_1, the assert therein will catch 2172 the bug. */ 2173 for (i = R_8; i <= R_32; ++i) 2174 arg_.offset2[-i - 1] = arg_.offset2[i]; 2175 2176 /* Setup got->offset. offset1[R_8] is either in the middle or at the 2177 beginning of GOT depending on use_neg_got_offsets_p. */ 2178 got->offset = arg_.offset1[R_8]; 2179 2180 arg_.symndx2h = symndx2h; 2181 arg_.n_ldm_entries = 0; 2182 2183 /* Assign offsets. */ 2184 htab_traverse (got->entries, elf_m68k_finalize_got_offsets_1, &arg_); 2185 2186 /* Check offset ranges we have actually assigned. */ 2187 for (i = (int) R_8; i <= (int) R_32; ++i) 2188 BFD_ASSERT (arg_.offset2[i] - arg_.offset1[i] <= 4); 2189 2190 *final_offset = start_offset; 2191 *n_ldm_entries = arg_.n_ldm_entries; 2192 } 2193 2194 struct elf_m68k_partition_multi_got_arg 2195 { 2196 /* The GOT we are adding entries to. Aka big got. */ 2197 struct elf_m68k_got *current_got; 2198 2199 /* Offset to assign the next CURRENT_GOT. */ 2200 bfd_vma offset; 2201 2202 /* Context where memory should be allocated. */ 2203 struct bfd_link_info *info; 2204 2205 /* Total number of slots in the .got section. 2206 This is used to calculate size of the .got and .rela.got sections. */ 2207 bfd_vma n_slots; 2208 2209 /* Difference in numbers of allocated slots in the .got section 2210 and necessary relocations in the .rela.got section. 2211 This is used to calculate size of the .rela.got section. */ 2212 bfd_vma slots_relas_diff; 2213 2214 /* Error flag. */ 2215 bfd_boolean error_p; 2216 2217 /* Mapping from global symndx to global symbols. 2218 This is used to build lists of got entries for global symbols. */ 2219 struct elf_m68k_link_hash_entry **symndx2h; 2220 }; 2221 2222 static void 2223 elf_m68k_partition_multi_got_2 (struct elf_m68k_partition_multi_got_arg *arg) 2224 { 2225 bfd_vma n_ldm_entries; 2226 2227 elf_m68k_finalize_got_offsets (arg->current_got, 2228 (elf_m68k_hash_table (arg->info) 2229 ->use_neg_got_offsets_p), 2230 arg->symndx2h, 2231 &arg->offset, &n_ldm_entries); 2232 2233 arg->n_slots += arg->current_got->n_slots[R_32]; 2234 2235 if (!bfd_link_pic (arg->info)) 2236 /* If we are generating a shared object, we need to 2237 output a R_68K_RELATIVE reloc so that the dynamic 2238 linker can adjust this GOT entry. Overwise we 2239 don't need space in .rela.got for local symbols. */ 2240 arg->slots_relas_diff += arg->current_got->local_n_slots; 2241 2242 /* @LDM relocations require a 2-slot GOT entry, but only 2243 one relocation. Account for that. */ 2244 arg->slots_relas_diff += n_ldm_entries; 2245 2246 BFD_ASSERT (arg->slots_relas_diff <= arg->n_slots); 2247 } 2248 2249 2250 /* Process a single BFD2GOT entry and either merge GOT to CURRENT_GOT 2251 or start a new CURRENT_GOT. */ 2252 2253 static int 2254 elf_m68k_partition_multi_got_1 (void **_entry, void *_arg) 2255 { 2256 struct elf_m68k_bfd2got_entry *entry; 2257 struct elf_m68k_partition_multi_got_arg *arg; 2258 struct elf_m68k_got *got; 2259 struct elf_m68k_got diff_; 2260 struct elf_m68k_got *diff; 2261 2262 entry = (struct elf_m68k_bfd2got_entry *) *_entry; 2263 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2264 2265 got = entry->got; 2266 BFD_ASSERT (got != NULL); 2267 BFD_ASSERT (got->offset == (bfd_vma) -1); 2268 2269 diff = NULL; 2270 2271 if (arg->current_got != NULL) 2272 /* Construct diff. */ 2273 { 2274 diff = &diff_; 2275 elf_m68k_init_got (diff); 2276 2277 if (!elf_m68k_can_merge_gots (arg->current_got, got, arg->info, diff)) 2278 { 2279 if (diff->offset == 0) 2280 /* Offset set to 0 in the diff_ indicates an error. */ 2281 { 2282 arg->error_p = TRUE; 2283 goto final_return; 2284 } 2285 2286 if (elf_m68k_hash_table (arg->info)->allow_multigot_p) 2287 { 2288 elf_m68k_clear_got (diff); 2289 /* Schedule to finish up current_got and start new one. */ 2290 diff = NULL; 2291 } 2292 /* else 2293 Merge GOTs no matter what. If big GOT overflows, 2294 we'll fail in relocate_section due to truncated relocations. 2295 2296 ??? May be fail earlier? E.g., in can_merge_gots. */ 2297 } 2298 } 2299 else 2300 /* Diff of got against empty current_got is got itself. */ 2301 { 2302 /* Create empty current_got to put subsequent GOTs to. */ 2303 arg->current_got = elf_m68k_create_empty_got (arg->info); 2304 if (arg->current_got == NULL) 2305 { 2306 arg->error_p = TRUE; 2307 goto final_return; 2308 } 2309 2310 arg->current_got->offset = arg->offset; 2311 2312 diff = got; 2313 } 2314 2315 if (diff != NULL) 2316 { 2317 if (!elf_m68k_merge_gots (arg->current_got, diff, arg->info)) 2318 { 2319 arg->error_p = TRUE; 2320 goto final_return; 2321 } 2322 2323 /* Now we can free GOT. */ 2324 elf_m68k_clear_got (got); 2325 2326 entry->got = arg->current_got; 2327 } 2328 else 2329 { 2330 /* Finish up current_got. */ 2331 elf_m68k_partition_multi_got_2 (arg); 2332 2333 /* Schedule to start a new current_got. */ 2334 arg->current_got = NULL; 2335 2336 /* Retry. */ 2337 if (!elf_m68k_partition_multi_got_1 (_entry, _arg)) 2338 { 2339 BFD_ASSERT (arg->error_p); 2340 goto final_return; 2341 } 2342 } 2343 2344 final_return: 2345 if (diff != NULL) 2346 elf_m68k_clear_got (diff); 2347 2348 return arg->error_p == FALSE ? 1 : 0; 2349 } 2350 2351 /* Helper function to build symndx2h mapping. */ 2352 2353 static bfd_boolean 2354 elf_m68k_init_symndx2h_1 (struct elf_link_hash_entry *_h, 2355 void *_arg) 2356 { 2357 struct elf_m68k_link_hash_entry *h; 2358 2359 h = elf_m68k_hash_entry (_h); 2360 2361 if (h->got_entry_key != 0) 2362 /* H has at least one entry in the GOT. */ 2363 { 2364 struct elf_m68k_partition_multi_got_arg *arg; 2365 2366 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2367 2368 BFD_ASSERT (arg->symndx2h[h->got_entry_key] == NULL); 2369 arg->symndx2h[h->got_entry_key] = h; 2370 } 2371 2372 return TRUE; 2373 } 2374 2375 /* Merge GOTs of some BFDs, assign offsets to GOT entries and build 2376 lists of GOT entries for global symbols. 2377 Calculate sizes of .got and .rela.got sections. */ 2378 2379 static bfd_boolean 2380 elf_m68k_partition_multi_got (struct bfd_link_info *info) 2381 { 2382 struct elf_m68k_multi_got *multi_got; 2383 struct elf_m68k_partition_multi_got_arg arg_; 2384 2385 multi_got = elf_m68k_multi_got (info); 2386 2387 arg_.current_got = NULL; 2388 arg_.offset = 0; 2389 arg_.info = info; 2390 arg_.n_slots = 0; 2391 arg_.slots_relas_diff = 0; 2392 arg_.error_p = FALSE; 2393 2394 if (multi_got->bfd2got != NULL) 2395 { 2396 /* Initialize symndx2h mapping. */ 2397 { 2398 arg_.symndx2h = bfd_zmalloc (multi_got->global_symndx 2399 * sizeof (*arg_.symndx2h)); 2400 if (arg_.symndx2h == NULL) 2401 return FALSE; 2402 2403 elf_link_hash_traverse (elf_hash_table (info), 2404 elf_m68k_init_symndx2h_1, &arg_); 2405 } 2406 2407 /* Partition. */ 2408 htab_traverse (multi_got->bfd2got, elf_m68k_partition_multi_got_1, 2409 &arg_); 2410 if (arg_.error_p) 2411 { 2412 free (arg_.symndx2h); 2413 arg_.symndx2h = NULL; 2414 2415 return FALSE; 2416 } 2417 2418 /* Finish up last current_got. */ 2419 elf_m68k_partition_multi_got_2 (&arg_); 2420 2421 free (arg_.symndx2h); 2422 } 2423 2424 if (elf_hash_table (info)->dynobj != NULL) 2425 /* Set sizes of .got and .rela.got sections. */ 2426 { 2427 asection *s; 2428 2429 s = bfd_get_linker_section (elf_hash_table (info)->dynobj, ".got"); 2430 if (s != NULL) 2431 s->size = arg_.offset; 2432 else 2433 BFD_ASSERT (arg_.offset == 0); 2434 2435 BFD_ASSERT (arg_.slots_relas_diff <= arg_.n_slots); 2436 arg_.n_slots -= arg_.slots_relas_diff; 2437 2438 s = bfd_get_linker_section (elf_hash_table (info)->dynobj, ".rela.got"); 2439 if (s != NULL) 2440 s->size = arg_.n_slots * sizeof (Elf32_External_Rela); 2441 else 2442 BFD_ASSERT (arg_.n_slots == 0); 2443 } 2444 else 2445 BFD_ASSERT (multi_got->bfd2got == NULL); 2446 2447 return TRUE; 2448 } 2449 2450 /* Specialized version of elf_m68k_get_got_entry that returns pointer 2451 to hashtable slot, thus allowing removal of entry via 2452 elf_m68k_remove_got_entry. */ 2453 2454 static struct elf_m68k_got_entry ** 2455 elf_m68k_find_got_entry_ptr (struct elf_m68k_got *got, 2456 struct elf_m68k_got_entry_key *key) 2457 { 2458 void **ptr; 2459 struct elf_m68k_got_entry entry_; 2460 struct elf_m68k_got_entry **entry_ptr; 2461 2462 entry_.key_ = *key; 2463 ptr = htab_find_slot (got->entries, &entry_, NO_INSERT); 2464 BFD_ASSERT (ptr != NULL); 2465 2466 entry_ptr = (struct elf_m68k_got_entry **) ptr; 2467 2468 return entry_ptr; 2469 } 2470 2471 /* Remove entry pointed to by ENTRY_PTR from GOT. */ 2472 2473 static void 2474 elf_m68k_remove_got_entry (struct elf_m68k_got *got, 2475 struct elf_m68k_got_entry **entry_ptr) 2476 { 2477 struct elf_m68k_got_entry *entry; 2478 2479 entry = *entry_ptr; 2480 2481 /* Check that offsets have not been finalized yet. */ 2482 BFD_ASSERT (got->offset == (bfd_vma) -1); 2483 /* Check that this entry is indeed unused. */ 2484 BFD_ASSERT (entry->u.s1.refcount == 0); 2485 2486 elf_m68k_remove_got_entry_type (got, entry->key_.type); 2487 2488 if (entry->key_.bfd != NULL) 2489 got->local_n_slots -= elf_m68k_reloc_got_n_slots (entry->key_.type); 2490 2491 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); 2492 2493 htab_clear_slot (got->entries, (void **) entry_ptr); 2494 } 2495 2496 /* Copy any information related to dynamic linking from a pre-existing 2497 symbol to a newly created symbol. Also called to copy flags and 2498 other back-end info to a weakdef, in which case the symbol is not 2499 newly created and plt/got refcounts and dynamic indices should not 2500 be copied. */ 2501 2502 static void 2503 elf_m68k_copy_indirect_symbol (struct bfd_link_info *info, 2504 struct elf_link_hash_entry *_dir, 2505 struct elf_link_hash_entry *_ind) 2506 { 2507 struct elf_m68k_link_hash_entry *dir; 2508 struct elf_m68k_link_hash_entry *ind; 2509 2510 _bfd_elf_link_hash_copy_indirect (info, _dir, _ind); 2511 2512 if (_ind->root.type != bfd_link_hash_indirect) 2513 return; 2514 2515 dir = elf_m68k_hash_entry (_dir); 2516 ind = elf_m68k_hash_entry (_ind); 2517 2518 /* Any absolute non-dynamic relocations against an indirect or weak 2519 definition will be against the target symbol. */ 2520 _dir->non_got_ref |= _ind->non_got_ref; 2521 2522 /* We might have a direct symbol already having entries in the GOTs. 2523 Update its key only in case indirect symbol has GOT entries and 2524 assert that both indirect and direct symbols don't have GOT entries 2525 at the same time. */ 2526 if (ind->got_entry_key != 0) 2527 { 2528 BFD_ASSERT (dir->got_entry_key == 0); 2529 /* Assert that GOTs aren't partitioned yet. */ 2530 BFD_ASSERT (ind->glist == NULL); 2531 2532 dir->got_entry_key = ind->got_entry_key; 2533 ind->got_entry_key = 0; 2534 } 2535 } 2536 2537 /* Look through the relocs for a section during the first phase, and 2538 allocate space in the global offset table or procedure linkage 2539 table. */ 2540 2541 static bfd_boolean 2542 elf_m68k_check_relocs (bfd *abfd, 2543 struct bfd_link_info *info, 2544 asection *sec, 2545 const Elf_Internal_Rela *relocs) 2546 { 2547 bfd *dynobj; 2548 Elf_Internal_Shdr *symtab_hdr; 2549 struct elf_link_hash_entry **sym_hashes; 2550 const Elf_Internal_Rela *rel; 2551 const Elf_Internal_Rela *rel_end; 2552 asection *sgot; 2553 asection *srelgot; 2554 asection *sreloc; 2555 struct elf_m68k_got *got; 2556 2557 if (bfd_link_relocatable (info)) 2558 return TRUE; 2559 2560 dynobj = elf_hash_table (info)->dynobj; 2561 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2562 sym_hashes = elf_sym_hashes (abfd); 2563 2564 sgot = NULL; 2565 srelgot = NULL; 2566 sreloc = NULL; 2567 2568 got = NULL; 2569 2570 rel_end = relocs + sec->reloc_count; 2571 for (rel = relocs; rel < rel_end; rel++) 2572 { 2573 unsigned long r_symndx; 2574 struct elf_link_hash_entry *h; 2575 2576 r_symndx = ELF32_R_SYM (rel->r_info); 2577 2578 if (r_symndx < symtab_hdr->sh_info) 2579 h = NULL; 2580 else 2581 { 2582 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2583 while (h->root.type == bfd_link_hash_indirect 2584 || h->root.type == bfd_link_hash_warning) 2585 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2586 2587 /* PR15323, ref flags aren't set for references in the same 2588 object. */ 2589 h->root.non_ir_ref = 1; 2590 } 2591 2592 switch (ELF32_R_TYPE (rel->r_info)) 2593 { 2594 case R_68K_GOT8: 2595 case R_68K_GOT16: 2596 case R_68K_GOT32: 2597 if (h != NULL 2598 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2599 break; 2600 /* Fall through. */ 2601 2602 /* Relative GOT relocations. */ 2603 case R_68K_GOT8O: 2604 case R_68K_GOT16O: 2605 case R_68K_GOT32O: 2606 /* Fall through. */ 2607 2608 /* TLS relocations. */ 2609 case R_68K_TLS_GD8: 2610 case R_68K_TLS_GD16: 2611 case R_68K_TLS_GD32: 2612 case R_68K_TLS_LDM8: 2613 case R_68K_TLS_LDM16: 2614 case R_68K_TLS_LDM32: 2615 case R_68K_TLS_IE8: 2616 case R_68K_TLS_IE16: 2617 case R_68K_TLS_IE32: 2618 2619 case R_68K_TLS_TPREL32: 2620 case R_68K_TLS_DTPREL32: 2621 2622 if (ELF32_R_TYPE (rel->r_info) == R_68K_TLS_TPREL32 2623 && bfd_link_pic (info)) 2624 /* Do the special chorus for libraries with static TLS. */ 2625 info->flags |= DF_STATIC_TLS; 2626 2627 /* This symbol requires a global offset table entry. */ 2628 2629 if (dynobj == NULL) 2630 { 2631 /* Create the .got section. */ 2632 elf_hash_table (info)->dynobj = dynobj = abfd; 2633 if (!_bfd_elf_create_got_section (dynobj, info)) 2634 return FALSE; 2635 } 2636 2637 if (sgot == NULL) 2638 { 2639 sgot = bfd_get_linker_section (dynobj, ".got"); 2640 BFD_ASSERT (sgot != NULL); 2641 } 2642 2643 if (srelgot == NULL 2644 && (h != NULL || bfd_link_pic (info))) 2645 { 2646 srelgot = bfd_get_linker_section (dynobj, ".rela.got"); 2647 if (srelgot == NULL) 2648 { 2649 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 2650 | SEC_IN_MEMORY | SEC_LINKER_CREATED 2651 | SEC_READONLY); 2652 srelgot = bfd_make_section_anyway_with_flags (dynobj, 2653 ".rela.got", 2654 flags); 2655 if (srelgot == NULL 2656 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 2657 return FALSE; 2658 } 2659 } 2660 2661 if (got == NULL) 2662 { 2663 struct elf_m68k_bfd2got_entry *bfd2got_entry; 2664 2665 bfd2got_entry 2666 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 2667 abfd, FIND_OR_CREATE, info); 2668 if (bfd2got_entry == NULL) 2669 return FALSE; 2670 2671 got = bfd2got_entry->got; 2672 BFD_ASSERT (got != NULL); 2673 } 2674 2675 { 2676 struct elf_m68k_got_entry *got_entry; 2677 2678 /* Add entry to got. */ 2679 got_entry = elf_m68k_add_entry_to_got (got, h, abfd, 2680 ELF32_R_TYPE (rel->r_info), 2681 r_symndx, info); 2682 if (got_entry == NULL) 2683 return FALSE; 2684 2685 if (got_entry->u.s1.refcount == 1) 2686 { 2687 /* Make sure this symbol is output as a dynamic symbol. */ 2688 if (h != NULL 2689 && h->dynindx == -1 2690 && !h->forced_local) 2691 { 2692 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2693 return FALSE; 2694 } 2695 } 2696 } 2697 2698 break; 2699 2700 case R_68K_PLT8: 2701 case R_68K_PLT16: 2702 case R_68K_PLT32: 2703 /* This symbol requires a procedure linkage table entry. We 2704 actually build the entry in adjust_dynamic_symbol, 2705 because this might be a case of linking PIC code which is 2706 never referenced by a dynamic object, in which case we 2707 don't need to generate a procedure linkage table entry 2708 after all. */ 2709 2710 /* If this is a local symbol, we resolve it directly without 2711 creating a procedure linkage table entry. */ 2712 if (h == NULL) 2713 continue; 2714 2715 h->needs_plt = 1; 2716 h->plt.refcount++; 2717 break; 2718 2719 case R_68K_PLT8O: 2720 case R_68K_PLT16O: 2721 case R_68K_PLT32O: 2722 /* This symbol requires a procedure linkage table entry. */ 2723 2724 if (h == NULL) 2725 { 2726 /* It does not make sense to have this relocation for a 2727 local symbol. FIXME: does it? How to handle it if 2728 it does make sense? */ 2729 bfd_set_error (bfd_error_bad_value); 2730 return FALSE; 2731 } 2732 2733 /* Make sure this symbol is output as a dynamic symbol. */ 2734 if (h->dynindx == -1 2735 && !h->forced_local) 2736 { 2737 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2738 return FALSE; 2739 } 2740 2741 h->needs_plt = 1; 2742 h->plt.refcount++; 2743 break; 2744 2745 case R_68K_PC8: 2746 case R_68K_PC16: 2747 case R_68K_PC32: 2748 /* If we are creating a shared library and this is not a local 2749 symbol, we need to copy the reloc into the shared library. 2750 However when linking with -Bsymbolic and this is a global 2751 symbol which is defined in an object we are including in the 2752 link (i.e., DEF_REGULAR is set), then we can resolve the 2753 reloc directly. At this point we have not seen all the input 2754 files, so it is possible that DEF_REGULAR is not set now but 2755 will be set later (it is never cleared). We account for that 2756 possibility below by storing information in the 2757 pcrel_relocs_copied field of the hash table entry. */ 2758 if (!(bfd_link_pic (info) 2759 && (sec->flags & SEC_ALLOC) != 0 2760 && h != NULL 2761 && (!SYMBOLIC_BIND (info, h) 2762 || h->root.type == bfd_link_hash_defweak 2763 || !h->def_regular))) 2764 { 2765 if (h != NULL) 2766 { 2767 /* Make sure a plt entry is created for this symbol if 2768 it turns out to be a function defined by a dynamic 2769 object. */ 2770 h->plt.refcount++; 2771 } 2772 break; 2773 } 2774 /* Fall through. */ 2775 case R_68K_8: 2776 case R_68K_16: 2777 case R_68K_32: 2778 /* We don't need to handle relocs into sections not going into 2779 the "real" output. */ 2780 if ((sec->flags & SEC_ALLOC) == 0) 2781 break; 2782 2783 if (h != NULL) 2784 { 2785 /* Make sure a plt entry is created for this symbol if it 2786 turns out to be a function defined by a dynamic object. */ 2787 h->plt.refcount++; 2788 2789 if (bfd_link_executable (info)) 2790 /* This symbol needs a non-GOT reference. */ 2791 h->non_got_ref = 1; 2792 } 2793 2794 /* If we are creating a shared library, we need to copy the 2795 reloc into the shared library. */ 2796 if (bfd_link_pic (info)) 2797 { 2798 /* When creating a shared object, we must copy these 2799 reloc types into the output file. We create a reloc 2800 section in dynobj and make room for this reloc. */ 2801 if (sreloc == NULL) 2802 { 2803 sreloc = _bfd_elf_make_dynamic_reloc_section 2804 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 2805 2806 if (sreloc == NULL) 2807 return FALSE; 2808 } 2809 2810 if (sec->flags & SEC_READONLY 2811 /* Don't set DF_TEXTREL yet for PC relative 2812 relocations, they might be discarded later. */ 2813 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2814 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2815 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)) 2816 { 2817 if (info->warn_shared_textrel) 2818 (*_bfd_error_handler) 2819 (_("warning: dynamic relocation to `%s' in readonly section `%s'"), 2820 h->root.root.string, sec->name); 2821 info->flags |= DF_TEXTREL; 2822 } 2823 2824 sreloc->size += sizeof (Elf32_External_Rela); 2825 2826 /* We count the number of PC relative relocations we have 2827 entered for this symbol, so that we can discard them 2828 again if, in the -Bsymbolic case, the symbol is later 2829 defined by a regular object, or, in the normal shared 2830 case, the symbol is forced to be local. Note that this 2831 function is only called if we are using an m68kelf linker 2832 hash table, which means that h is really a pointer to an 2833 elf_m68k_link_hash_entry. */ 2834 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2835 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2836 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) 2837 { 2838 struct elf_m68k_pcrel_relocs_copied *p; 2839 struct elf_m68k_pcrel_relocs_copied **head; 2840 2841 if (h != NULL) 2842 { 2843 struct elf_m68k_link_hash_entry *eh 2844 = elf_m68k_hash_entry (h); 2845 head = &eh->pcrel_relocs_copied; 2846 } 2847 else 2848 { 2849 asection *s; 2850 void *vpp; 2851 Elf_Internal_Sym *isym; 2852 2853 isym = bfd_sym_from_r_symndx (&elf_m68k_hash_table (info)->sym_cache, 2854 abfd, r_symndx); 2855 if (isym == NULL) 2856 return FALSE; 2857 2858 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 2859 if (s == NULL) 2860 s = sec; 2861 2862 vpp = &elf_section_data (s)->local_dynrel; 2863 head = (struct elf_m68k_pcrel_relocs_copied **) vpp; 2864 } 2865 2866 for (p = *head; p != NULL; p = p->next) 2867 if (p->section == sreloc) 2868 break; 2869 2870 if (p == NULL) 2871 { 2872 p = ((struct elf_m68k_pcrel_relocs_copied *) 2873 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 2874 if (p == NULL) 2875 return FALSE; 2876 p->next = *head; 2877 *head = p; 2878 p->section = sreloc; 2879 p->count = 0; 2880 } 2881 2882 ++p->count; 2883 } 2884 } 2885 2886 break; 2887 2888 /* This relocation describes the C++ object vtable hierarchy. 2889 Reconstruct it for later use during GC. */ 2890 case R_68K_GNU_VTINHERIT: 2891 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2892 return FALSE; 2893 break; 2894 2895 /* This relocation describes which C++ vtable entries are actually 2896 used. Record for later use during GC. */ 2897 case R_68K_GNU_VTENTRY: 2898 BFD_ASSERT (h != NULL); 2899 if (h != NULL 2900 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2901 return FALSE; 2902 break; 2903 2904 default: 2905 break; 2906 } 2907 } 2908 2909 return TRUE; 2910 } 2911 2912 /* Return the section that should be marked against GC for a given 2913 relocation. */ 2914 2915 static asection * 2916 elf_m68k_gc_mark_hook (asection *sec, 2917 struct bfd_link_info *info, 2918 Elf_Internal_Rela *rel, 2919 struct elf_link_hash_entry *h, 2920 Elf_Internal_Sym *sym) 2921 { 2922 if (h != NULL) 2923 switch (ELF32_R_TYPE (rel->r_info)) 2924 { 2925 case R_68K_GNU_VTINHERIT: 2926 case R_68K_GNU_VTENTRY: 2927 return NULL; 2928 } 2929 2930 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2931 } 2932 2933 /* Update the got entry reference counts for the section being removed. */ 2934 2935 static bfd_boolean 2936 elf_m68k_gc_sweep_hook (bfd *abfd, 2937 struct bfd_link_info *info, 2938 asection *sec, 2939 const Elf_Internal_Rela *relocs) 2940 { 2941 Elf_Internal_Shdr *symtab_hdr; 2942 struct elf_link_hash_entry **sym_hashes; 2943 const Elf_Internal_Rela *rel, *relend; 2944 bfd *dynobj; 2945 struct elf_m68k_got *got; 2946 2947 if (bfd_link_relocatable (info)) 2948 return TRUE; 2949 2950 dynobj = elf_hash_table (info)->dynobj; 2951 if (dynobj == NULL) 2952 return TRUE; 2953 2954 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2955 sym_hashes = elf_sym_hashes (abfd); 2956 got = NULL; 2957 2958 relend = relocs + sec->reloc_count; 2959 for (rel = relocs; rel < relend; rel++) 2960 { 2961 unsigned long r_symndx; 2962 struct elf_link_hash_entry *h = NULL; 2963 2964 r_symndx = ELF32_R_SYM (rel->r_info); 2965 if (r_symndx >= symtab_hdr->sh_info) 2966 { 2967 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2968 while (h->root.type == bfd_link_hash_indirect 2969 || h->root.type == bfd_link_hash_warning) 2970 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2971 } 2972 2973 switch (ELF32_R_TYPE (rel->r_info)) 2974 { 2975 case R_68K_GOT8: 2976 case R_68K_GOT16: 2977 case R_68K_GOT32: 2978 if (h != NULL 2979 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2980 break; 2981 2982 /* FALLTHRU */ 2983 case R_68K_GOT8O: 2984 case R_68K_GOT16O: 2985 case R_68K_GOT32O: 2986 /* Fall through. */ 2987 2988 /* TLS relocations. */ 2989 case R_68K_TLS_GD8: 2990 case R_68K_TLS_GD16: 2991 case R_68K_TLS_GD32: 2992 case R_68K_TLS_LDM8: 2993 case R_68K_TLS_LDM16: 2994 case R_68K_TLS_LDM32: 2995 case R_68K_TLS_IE8: 2996 case R_68K_TLS_IE16: 2997 case R_68K_TLS_IE32: 2998 2999 case R_68K_TLS_TPREL32: 3000 case R_68K_TLS_DTPREL32: 3001 3002 if (got == NULL) 3003 { 3004 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3005 abfd, MUST_FIND, NULL)->got; 3006 BFD_ASSERT (got != NULL); 3007 } 3008 3009 { 3010 struct elf_m68k_got_entry_key key_; 3011 struct elf_m68k_got_entry **got_entry_ptr; 3012 struct elf_m68k_got_entry *got_entry; 3013 3014 elf_m68k_init_got_entry_key (&key_, h, abfd, r_symndx, 3015 ELF32_R_TYPE (rel->r_info)); 3016 got_entry_ptr = elf_m68k_find_got_entry_ptr (got, &key_); 3017 3018 got_entry = *got_entry_ptr; 3019 3020 if (got_entry->u.s1.refcount > 0) 3021 { 3022 --got_entry->u.s1.refcount; 3023 3024 if (got_entry->u.s1.refcount == 0) 3025 /* We don't need the .got entry any more. */ 3026 elf_m68k_remove_got_entry (got, got_entry_ptr); 3027 } 3028 } 3029 break; 3030 3031 case R_68K_PLT8: 3032 case R_68K_PLT16: 3033 case R_68K_PLT32: 3034 case R_68K_PLT8O: 3035 case R_68K_PLT16O: 3036 case R_68K_PLT32O: 3037 case R_68K_PC8: 3038 case R_68K_PC16: 3039 case R_68K_PC32: 3040 case R_68K_8: 3041 case R_68K_16: 3042 case R_68K_32: 3043 if (h != NULL) 3044 { 3045 if (h->plt.refcount > 0) 3046 --h->plt.refcount; 3047 } 3048 break; 3049 3050 default: 3051 break; 3052 } 3053 } 3054 3055 return TRUE; 3056 } 3057 3058 /* Return the type of PLT associated with OUTPUT_BFD. */ 3059 3060 static const struct elf_m68k_plt_info * 3061 elf_m68k_get_plt_info (bfd *output_bfd) 3062 { 3063 unsigned int features; 3064 3065 features = bfd_m68k_mach_to_features (bfd_get_mach (output_bfd)); 3066 if (features & cpu32) 3067 return &elf_cpu32_plt_info; 3068 if (features & mcfisa_b) 3069 return &elf_isab_plt_info; 3070 if (features & mcfisa_c) 3071 return &elf_isac_plt_info; 3072 return &elf_m68k_plt_info; 3073 } 3074 3075 /* This function is called after all the input files have been read, 3076 and the input sections have been assigned to output sections. 3077 It's a convenient place to determine the PLT style. */ 3078 3079 static bfd_boolean 3080 elf_m68k_always_size_sections (bfd *output_bfd, struct bfd_link_info *info) 3081 { 3082 /* Bind input BFDs to GOTs and calculate sizes of .got and .rela.got 3083 sections. */ 3084 if (!elf_m68k_partition_multi_got (info)) 3085 return FALSE; 3086 3087 elf_m68k_hash_table (info)->plt_info = elf_m68k_get_plt_info (output_bfd); 3088 return TRUE; 3089 } 3090 3091 /* Adjust a symbol defined by a dynamic object and referenced by a 3092 regular object. The current definition is in some section of the 3093 dynamic object, but we're not including those sections. We have to 3094 change the definition to something the rest of the link can 3095 understand. */ 3096 3097 static bfd_boolean 3098 elf_m68k_adjust_dynamic_symbol (struct bfd_link_info *info, 3099 struct elf_link_hash_entry *h) 3100 { 3101 struct elf_m68k_link_hash_table *htab; 3102 bfd *dynobj; 3103 asection *s; 3104 3105 htab = elf_m68k_hash_table (info); 3106 dynobj = elf_hash_table (info)->dynobj; 3107 3108 /* Make sure we know what is going on here. */ 3109 BFD_ASSERT (dynobj != NULL 3110 && (h->needs_plt 3111 || h->type == STT_GNU_IFUNC 3112 || h->u.weakdef != NULL 3113 || (h->def_dynamic 3114 && h->ref_regular 3115 && !h->def_regular))); 3116 3117 /* If this is a function, put it in the procedure linkage table. We 3118 will fill in the contents of the procedure linkage table later, 3119 when we know the address of the .got section. */ 3120 if ((h->type == STT_FUNC || h->type == STT_GNU_IFUNC) 3121 || h->needs_plt) 3122 { 3123 if ((h->plt.refcount <= 0 3124 || SYMBOL_CALLS_LOCAL (info, h) 3125 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 3126 && h->root.type == bfd_link_hash_undefweak)) 3127 /* We must always create the plt entry if it was referenced 3128 by a PLTxxO relocation. In this case we already recorded 3129 it as a dynamic symbol. */ 3130 && h->dynindx == -1) 3131 { 3132 /* This case can occur if we saw a PLTxx reloc in an input 3133 file, but the symbol was never referred to by a dynamic 3134 object, or if all references were garbage collected. In 3135 such a case, we don't actually need to build a procedure 3136 linkage table, and we can just do a PCxx reloc instead. */ 3137 h->plt.offset = (bfd_vma) -1; 3138 h->needs_plt = 0; 3139 return TRUE; 3140 } 3141 3142 /* Make sure this symbol is output as a dynamic symbol. */ 3143 if (h->dynindx == -1 3144 && !h->forced_local) 3145 { 3146 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3147 return FALSE; 3148 } 3149 3150 s = bfd_get_linker_section (dynobj, ".plt"); 3151 BFD_ASSERT (s != NULL); 3152 3153 /* If this is the first .plt entry, make room for the special 3154 first entry. */ 3155 if (s->size == 0) 3156 s->size = htab->plt_info->size; 3157 3158 /* If this symbol is not defined in a regular file, and we are 3159 not generating a shared library, then set the symbol to this 3160 location in the .plt. This is required to make function 3161 pointers compare as equal between the normal executable and 3162 the shared library. */ 3163 if (!bfd_link_pic (info) 3164 && !h->def_regular) 3165 { 3166 h->root.u.def.section = s; 3167 h->root.u.def.value = s->size; 3168 } 3169 3170 h->plt.offset = s->size; 3171 3172 /* Make room for this entry. */ 3173 s->size += htab->plt_info->size; 3174 3175 /* We also need to make an entry in the .got.plt section, which 3176 will be placed in the .got section by the linker script. */ 3177 s = bfd_get_linker_section (dynobj, ".got.plt"); 3178 BFD_ASSERT (s != NULL); 3179 s->size += 4; 3180 3181 /* We also need to make an entry in the .rela.plt section. */ 3182 s = bfd_get_linker_section (dynobj, ".rela.plt"); 3183 BFD_ASSERT (s != NULL); 3184 s->size += sizeof (Elf32_External_Rela); 3185 3186 return TRUE; 3187 } 3188 3189 /* Reinitialize the plt offset now that it is not used as a reference 3190 count any more. */ 3191 h->plt.offset = (bfd_vma) -1; 3192 3193 /* If this is a weak symbol, and there is a real definition, the 3194 processor independent code will have arranged for us to see the 3195 real definition first, and we can just use the same value. */ 3196 if (h->u.weakdef != NULL) 3197 { 3198 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 3199 || h->u.weakdef->root.type == bfd_link_hash_defweak); 3200 h->root.u.def.section = h->u.weakdef->root.u.def.section; 3201 h->root.u.def.value = h->u.weakdef->root.u.def.value; 3202 return TRUE; 3203 } 3204 3205 /* This is a reference to a symbol defined by a dynamic object which 3206 is not a function. */ 3207 3208 /* If we are creating a shared library, we must presume that the 3209 only references to the symbol are via the global offset table. 3210 For such cases we need not do anything here; the relocations will 3211 be handled correctly by relocate_section. */ 3212 if (bfd_link_pic (info)) 3213 return TRUE; 3214 3215 /* If there are no references to this symbol that do not use the 3216 GOT, we don't need to generate a copy reloc. */ 3217 if (!h->non_got_ref) 3218 return TRUE; 3219 3220 /* We must allocate the symbol in our .dynbss section, which will 3221 become part of the .bss section of the executable. There will be 3222 an entry for this symbol in the .dynsym section. The dynamic 3223 object will contain position independent code, so all references 3224 from the dynamic object to this symbol will go through the global 3225 offset table. The dynamic linker will use the .dynsym entry to 3226 determine the address it must put in the global offset table, so 3227 both the dynamic object and the regular object will refer to the 3228 same memory location for the variable. */ 3229 3230 s = bfd_get_linker_section (dynobj, ".dynbss"); 3231 BFD_ASSERT (s != NULL); 3232 3233 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to 3234 copy the initial value out of the dynamic object and into the 3235 runtime process image. We need to remember the offset into the 3236 .rela.bss section we are going to use. */ 3237 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 3238 { 3239 asection *srel; 3240 3241 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 3242 BFD_ASSERT (srel != NULL); 3243 srel->size += sizeof (Elf32_External_Rela); 3244 h->needs_copy = 1; 3245 } 3246 3247 return _bfd_elf_adjust_dynamic_copy (info, h, s); 3248 } 3249 3250 /* Set the sizes of the dynamic sections. */ 3251 3252 static bfd_boolean 3253 elf_m68k_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 3254 struct bfd_link_info *info) 3255 { 3256 bfd *dynobj; 3257 asection *s; 3258 bfd_boolean plt; 3259 bfd_boolean relocs; 3260 3261 dynobj = elf_hash_table (info)->dynobj; 3262 BFD_ASSERT (dynobj != NULL); 3263 3264 if (elf_hash_table (info)->dynamic_sections_created) 3265 { 3266 /* Set the contents of the .interp section to the interpreter. */ 3267 if (bfd_link_executable (info) && !info->nointerp) 3268 { 3269 s = bfd_get_linker_section (dynobj, ".interp"); 3270 BFD_ASSERT (s != NULL); 3271 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 3272 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 3273 } 3274 } 3275 else 3276 { 3277 /* We may have created entries in the .rela.got section. 3278 However, if we are not creating the dynamic sections, we will 3279 not actually use these entries. Reset the size of .rela.got, 3280 which will cause it to get stripped from the output file 3281 below. */ 3282 s = bfd_get_linker_section (dynobj, ".rela.got"); 3283 if (s != NULL) 3284 s->size = 0; 3285 } 3286 3287 /* If this is a -Bsymbolic shared link, then we need to discard all 3288 PC relative relocs against symbols defined in a regular object. 3289 For the normal shared case we discard the PC relative relocs 3290 against symbols that have become local due to visibility changes. 3291 We allocated space for them in the check_relocs routine, but we 3292 will not fill them in in the relocate_section routine. */ 3293 if (bfd_link_pic (info)) 3294 elf_link_hash_traverse (elf_hash_table (info), 3295 elf_m68k_discard_copies, 3296 info); 3297 3298 /* The check_relocs and adjust_dynamic_symbol entry points have 3299 determined the sizes of the various dynamic sections. Allocate 3300 memory for them. */ 3301 plt = FALSE; 3302 relocs = FALSE; 3303 for (s = dynobj->sections; s != NULL; s = s->next) 3304 { 3305 const char *name; 3306 3307 if ((s->flags & SEC_LINKER_CREATED) == 0) 3308 continue; 3309 3310 /* It's OK to base decisions on the section name, because none 3311 of the dynobj section names depend upon the input files. */ 3312 name = bfd_get_section_name (dynobj, s); 3313 3314 if (strcmp (name, ".plt") == 0) 3315 { 3316 /* Remember whether there is a PLT. */ 3317 plt = s->size != 0; 3318 } 3319 else if (CONST_STRNEQ (name, ".rela")) 3320 { 3321 if (s->size != 0) 3322 { 3323 relocs = TRUE; 3324 3325 /* We use the reloc_count field as a counter if we need 3326 to copy relocs into the output file. */ 3327 s->reloc_count = 0; 3328 } 3329 } 3330 else if (! CONST_STRNEQ (name, ".got") 3331 && strcmp (name, ".dynbss") != 0) 3332 { 3333 /* It's not one of our sections, so don't allocate space. */ 3334 continue; 3335 } 3336 3337 if (s->size == 0) 3338 { 3339 /* If we don't need this section, strip it from the 3340 output file. This is mostly to handle .rela.bss and 3341 .rela.plt. We must create both sections in 3342 create_dynamic_sections, because they must be created 3343 before the linker maps input sections to output 3344 sections. The linker does that before 3345 adjust_dynamic_symbol is called, and it is that 3346 function which decides whether anything needs to go 3347 into these sections. */ 3348 s->flags |= SEC_EXCLUDE; 3349 continue; 3350 } 3351 3352 if ((s->flags & SEC_HAS_CONTENTS) == 0) 3353 continue; 3354 3355 /* Allocate memory for the section contents. */ 3356 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 3357 Unused entries should be reclaimed before the section's contents 3358 are written out, but at the moment this does not happen. Thus in 3359 order to prevent writing out garbage, we initialise the section's 3360 contents to zero. */ 3361 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 3362 if (s->contents == NULL) 3363 return FALSE; 3364 } 3365 3366 if (elf_hash_table (info)->dynamic_sections_created) 3367 { 3368 /* Add some entries to the .dynamic section. We fill in the 3369 values later, in elf_m68k_finish_dynamic_sections, but we 3370 must add the entries now so that we get the correct size for 3371 the .dynamic section. The DT_DEBUG entry is filled in by the 3372 dynamic linker and used by the debugger. */ 3373 #define add_dynamic_entry(TAG, VAL) \ 3374 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3375 3376 if (bfd_link_executable (info)) 3377 { 3378 if (!add_dynamic_entry (DT_DEBUG, 0)) 3379 return FALSE; 3380 } 3381 3382 if (plt) 3383 { 3384 if (!add_dynamic_entry (DT_PLTGOT, 0) 3385 || !add_dynamic_entry (DT_PLTRELSZ, 0) 3386 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3387 || !add_dynamic_entry (DT_JMPREL, 0)) 3388 return FALSE; 3389 } 3390 3391 if (relocs) 3392 { 3393 if (!add_dynamic_entry (DT_RELA, 0) 3394 || !add_dynamic_entry (DT_RELASZ, 0) 3395 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3396 return FALSE; 3397 } 3398 3399 if ((info->flags & DF_TEXTREL) != 0) 3400 { 3401 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3402 return FALSE; 3403 } 3404 } 3405 #undef add_dynamic_entry 3406 3407 return TRUE; 3408 } 3409 3410 /* This function is called via elf_link_hash_traverse if we are 3411 creating a shared object. In the -Bsymbolic case it discards the 3412 space allocated to copy PC relative relocs against symbols which 3413 are defined in regular objects. For the normal shared case, it 3414 discards space for pc-relative relocs that have become local due to 3415 symbol visibility changes. We allocated space for them in the 3416 check_relocs routine, but we won't fill them in in the 3417 relocate_section routine. 3418 3419 We also check whether any of the remaining relocations apply 3420 against a readonly section, and set the DF_TEXTREL flag in this 3421 case. */ 3422 3423 static bfd_boolean 3424 elf_m68k_discard_copies (struct elf_link_hash_entry *h, 3425 void * inf) 3426 { 3427 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3428 struct elf_m68k_pcrel_relocs_copied *s; 3429 3430 if (!SYMBOL_CALLS_LOCAL (info, h)) 3431 { 3432 if ((info->flags & DF_TEXTREL) == 0) 3433 { 3434 /* Look for relocations against read-only sections. */ 3435 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3436 s != NULL; 3437 s = s->next) 3438 if ((s->section->flags & SEC_READONLY) != 0) 3439 { 3440 if (info->warn_shared_textrel) 3441 (*_bfd_error_handler) 3442 (_("warning: dynamic relocation to `%s' in readonly section `%s'"), 3443 h->root.root.string, s->section->name); 3444 info->flags |= DF_TEXTREL; 3445 break; 3446 } 3447 } 3448 3449 /* Make sure undefined weak symbols are output as a dynamic symbol 3450 in PIEs. */ 3451 if (h->non_got_ref 3452 && h->root.type == bfd_link_hash_undefweak 3453 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3454 && h->dynindx == -1 3455 && !h->forced_local) 3456 { 3457 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3458 return FALSE; 3459 } 3460 3461 return TRUE; 3462 } 3463 3464 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3465 s != NULL; 3466 s = s->next) 3467 s->section->size -= s->count * sizeof (Elf32_External_Rela); 3468 3469 return TRUE; 3470 } 3471 3472 3473 /* Install relocation RELA. */ 3474 3475 static void 3476 elf_m68k_install_rela (bfd *output_bfd, 3477 asection *srela, 3478 Elf_Internal_Rela *rela) 3479 { 3480 bfd_byte *loc; 3481 3482 loc = srela->contents; 3483 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 3484 bfd_elf32_swap_reloca_out (output_bfd, rela, loc); 3485 } 3486 3487 /* Find the base offsets for thread-local storage in this object, 3488 for GD/LD and IE/LE respectively. */ 3489 3490 #define DTP_OFFSET 0x8000 3491 #define TP_OFFSET 0x7000 3492 3493 static bfd_vma 3494 dtpoff_base (struct bfd_link_info *info) 3495 { 3496 /* If tls_sec is NULL, we should have signalled an error already. */ 3497 if (elf_hash_table (info)->tls_sec == NULL) 3498 return 0; 3499 return elf_hash_table (info)->tls_sec->vma + DTP_OFFSET; 3500 } 3501 3502 static bfd_vma 3503 tpoff_base (struct bfd_link_info *info) 3504 { 3505 /* If tls_sec is NULL, we should have signalled an error already. */ 3506 if (elf_hash_table (info)->tls_sec == NULL) 3507 return 0; 3508 return elf_hash_table (info)->tls_sec->vma + TP_OFFSET; 3509 } 3510 3511 /* Output necessary relocation to handle a symbol during static link. 3512 This function is called from elf_m68k_relocate_section. */ 3513 3514 static void 3515 elf_m68k_init_got_entry_static (struct bfd_link_info *info, 3516 bfd *output_bfd, 3517 enum elf_m68k_reloc_type r_type, 3518 asection *sgot, 3519 bfd_vma got_entry_offset, 3520 bfd_vma relocation) 3521 { 3522 switch (elf_m68k_reloc_got_type (r_type)) 3523 { 3524 case R_68K_GOT32O: 3525 bfd_put_32 (output_bfd, relocation, sgot->contents + got_entry_offset); 3526 break; 3527 3528 case R_68K_TLS_GD32: 3529 /* We know the offset within the module, 3530 put it into the second GOT slot. */ 3531 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3532 sgot->contents + got_entry_offset + 4); 3533 /* FALLTHRU */ 3534 3535 case R_68K_TLS_LDM32: 3536 /* Mark it as belonging to module 1, the executable. */ 3537 bfd_put_32 (output_bfd, 1, sgot->contents + got_entry_offset); 3538 break; 3539 3540 case R_68K_TLS_IE32: 3541 bfd_put_32 (output_bfd, relocation - tpoff_base (info), 3542 sgot->contents + got_entry_offset); 3543 break; 3544 3545 default: 3546 BFD_ASSERT (FALSE); 3547 } 3548 } 3549 3550 /* Output necessary relocation to handle a local symbol 3551 during dynamic link. 3552 This function is called either from elf_m68k_relocate_section 3553 or from elf_m68k_finish_dynamic_symbol. */ 3554 3555 static void 3556 elf_m68k_init_got_entry_local_shared (struct bfd_link_info *info, 3557 bfd *output_bfd, 3558 enum elf_m68k_reloc_type r_type, 3559 asection *sgot, 3560 bfd_vma got_entry_offset, 3561 bfd_vma relocation, 3562 asection *srela) 3563 { 3564 Elf_Internal_Rela outrel; 3565 3566 switch (elf_m68k_reloc_got_type (r_type)) 3567 { 3568 case R_68K_GOT32O: 3569 /* Emit RELATIVE relocation to initialize GOT slot 3570 at run-time. */ 3571 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 3572 outrel.r_addend = relocation; 3573 break; 3574 3575 case R_68K_TLS_GD32: 3576 /* We know the offset within the module, 3577 put it into the second GOT slot. */ 3578 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3579 sgot->contents + got_entry_offset + 4); 3580 /* FALLTHRU */ 3581 3582 case R_68K_TLS_LDM32: 3583 /* We don't know the module number, 3584 create a relocation for it. */ 3585 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_DTPMOD32); 3586 outrel.r_addend = 0; 3587 break; 3588 3589 case R_68K_TLS_IE32: 3590 /* Emit TPREL relocation to initialize GOT slot 3591 at run-time. */ 3592 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_TPREL32); 3593 outrel.r_addend = relocation - elf_hash_table (info)->tls_sec->vma; 3594 break; 3595 3596 default: 3597 BFD_ASSERT (FALSE); 3598 } 3599 3600 /* Offset of the GOT entry. */ 3601 outrel.r_offset = (sgot->output_section->vma 3602 + sgot->output_offset 3603 + got_entry_offset); 3604 3605 /* Install one of the above relocations. */ 3606 elf_m68k_install_rela (output_bfd, srela, &outrel); 3607 3608 bfd_put_32 (output_bfd, outrel.r_addend, sgot->contents + got_entry_offset); 3609 } 3610 3611 /* Relocate an M68K ELF section. */ 3612 3613 static bfd_boolean 3614 elf_m68k_relocate_section (bfd *output_bfd, 3615 struct bfd_link_info *info, 3616 bfd *input_bfd, 3617 asection *input_section, 3618 bfd_byte *contents, 3619 Elf_Internal_Rela *relocs, 3620 Elf_Internal_Sym *local_syms, 3621 asection **local_sections) 3622 { 3623 bfd *dynobj; 3624 Elf_Internal_Shdr *symtab_hdr; 3625 struct elf_link_hash_entry **sym_hashes; 3626 asection *sgot; 3627 asection *splt; 3628 asection *sreloc; 3629 asection *srela; 3630 struct elf_m68k_got *got; 3631 Elf_Internal_Rela *rel; 3632 Elf_Internal_Rela *relend; 3633 3634 dynobj = elf_hash_table (info)->dynobj; 3635 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3636 sym_hashes = elf_sym_hashes (input_bfd); 3637 3638 sgot = NULL; 3639 splt = NULL; 3640 sreloc = NULL; 3641 srela = NULL; 3642 3643 got = NULL; 3644 3645 rel = relocs; 3646 relend = relocs + input_section->reloc_count; 3647 for (; rel < relend; rel++) 3648 { 3649 int r_type; 3650 reloc_howto_type *howto; 3651 unsigned long r_symndx; 3652 struct elf_link_hash_entry *h; 3653 Elf_Internal_Sym *sym; 3654 asection *sec; 3655 bfd_vma relocation; 3656 bfd_boolean unresolved_reloc; 3657 bfd_reloc_status_type r; 3658 3659 r_type = ELF32_R_TYPE (rel->r_info); 3660 if (r_type < 0 || r_type >= (int) R_68K_max) 3661 { 3662 bfd_set_error (bfd_error_bad_value); 3663 return FALSE; 3664 } 3665 howto = howto_table + r_type; 3666 3667 r_symndx = ELF32_R_SYM (rel->r_info); 3668 3669 h = NULL; 3670 sym = NULL; 3671 sec = NULL; 3672 unresolved_reloc = FALSE; 3673 3674 if (r_symndx < symtab_hdr->sh_info) 3675 { 3676 sym = local_syms + r_symndx; 3677 sec = local_sections[r_symndx]; 3678 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 3679 } 3680 else 3681 { 3682 bfd_boolean warned, ignored; 3683 3684 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 3685 r_symndx, symtab_hdr, sym_hashes, 3686 h, sec, relocation, 3687 unresolved_reloc, warned, ignored); 3688 } 3689 3690 if (sec != NULL && discarded_section (sec)) 3691 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 3692 rel, 1, relend, howto, 0, contents); 3693 3694 if (bfd_link_relocatable (info)) 3695 continue; 3696 3697 switch (r_type) 3698 { 3699 case R_68K_GOT8: 3700 case R_68K_GOT16: 3701 case R_68K_GOT32: 3702 /* Relocation is to the address of the entry for this symbol 3703 in the global offset table. */ 3704 if (h != NULL 3705 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 3706 { 3707 if (elf_m68k_hash_table (info)->local_gp_p) 3708 { 3709 bfd_vma sgot_output_offset; 3710 bfd_vma got_offset; 3711 3712 if (sgot == NULL) 3713 { 3714 sgot = bfd_get_linker_section (dynobj, ".got"); 3715 3716 if (sgot != NULL) 3717 sgot_output_offset = sgot->output_offset; 3718 else 3719 /* In this case we have a reference to 3720 _GLOBAL_OFFSET_TABLE_, but the GOT itself is 3721 empty. 3722 ??? Issue a warning? */ 3723 sgot_output_offset = 0; 3724 } 3725 else 3726 sgot_output_offset = sgot->output_offset; 3727 3728 if (got == NULL) 3729 { 3730 struct elf_m68k_bfd2got_entry *bfd2got_entry; 3731 3732 bfd2got_entry 3733 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3734 input_bfd, SEARCH, NULL); 3735 3736 if (bfd2got_entry != NULL) 3737 { 3738 got = bfd2got_entry->got; 3739 BFD_ASSERT (got != NULL); 3740 3741 got_offset = got->offset; 3742 } 3743 else 3744 /* In this case we have a reference to 3745 _GLOBAL_OFFSET_TABLE_, but no other references 3746 accessing any GOT entries. 3747 ??? Issue a warning? */ 3748 got_offset = 0; 3749 } 3750 else 3751 got_offset = got->offset; 3752 3753 /* Adjust GOT pointer to point to the GOT 3754 assigned to input_bfd. */ 3755 rel->r_addend += sgot_output_offset + got_offset; 3756 } 3757 else 3758 BFD_ASSERT (got == NULL || got->offset == 0); 3759 3760 break; 3761 } 3762 /* Fall through. */ 3763 case R_68K_GOT8O: 3764 case R_68K_GOT16O: 3765 case R_68K_GOT32O: 3766 3767 case R_68K_TLS_LDM32: 3768 case R_68K_TLS_LDM16: 3769 case R_68K_TLS_LDM8: 3770 3771 case R_68K_TLS_GD8: 3772 case R_68K_TLS_GD16: 3773 case R_68K_TLS_GD32: 3774 3775 case R_68K_TLS_IE8: 3776 case R_68K_TLS_IE16: 3777 case R_68K_TLS_IE32: 3778 3779 /* Relocation is the offset of the entry for this symbol in 3780 the global offset table. */ 3781 3782 { 3783 struct elf_m68k_got_entry_key key_; 3784 bfd_vma *off_ptr; 3785 bfd_vma off; 3786 3787 if (sgot == NULL) 3788 { 3789 sgot = bfd_get_linker_section (dynobj, ".got"); 3790 BFD_ASSERT (sgot != NULL); 3791 } 3792 3793 if (got == NULL) 3794 { 3795 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3796 input_bfd, MUST_FIND, 3797 NULL)->got; 3798 BFD_ASSERT (got != NULL); 3799 } 3800 3801 /* Get GOT offset for this symbol. */ 3802 elf_m68k_init_got_entry_key (&key_, h, input_bfd, r_symndx, 3803 r_type); 3804 off_ptr = &elf_m68k_get_got_entry (got, &key_, MUST_FIND, 3805 NULL)->u.s2.offset; 3806 off = *off_ptr; 3807 3808 /* The offset must always be a multiple of 4. We use 3809 the least significant bit to record whether we have 3810 already generated the necessary reloc. */ 3811 if ((off & 1) != 0) 3812 off &= ~1; 3813 else 3814 { 3815 if (h != NULL 3816 /* @TLSLDM relocations are bounded to the module, in 3817 which the symbol is defined -- not to the symbol 3818 itself. */ 3819 && elf_m68k_reloc_got_type (r_type) != R_68K_TLS_LDM32) 3820 { 3821 bfd_boolean dyn; 3822 3823 dyn = elf_hash_table (info)->dynamic_sections_created; 3824 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 3825 bfd_link_pic (info), 3826 h) 3827 || (bfd_link_pic (info) 3828 && SYMBOL_REFERENCES_LOCAL (info, h)) 3829 || (ELF_ST_VISIBILITY (h->other) 3830 && h->root.type == bfd_link_hash_undefweak)) 3831 { 3832 /* This is actually a static link, or it is a 3833 -Bsymbolic link and the symbol is defined 3834 locally, or the symbol was forced to be local 3835 because of a version file. We must initialize 3836 this entry in the global offset table. Since 3837 the offset must always be a multiple of 4, we 3838 use the least significant bit to record whether 3839 we have initialized it already. 3840 3841 When doing a dynamic link, we create a .rela.got 3842 relocation entry to initialize the value. This 3843 is done in the finish_dynamic_symbol routine. */ 3844 3845 elf_m68k_init_got_entry_static (info, 3846 output_bfd, 3847 r_type, 3848 sgot, 3849 off, 3850 relocation); 3851 3852 *off_ptr |= 1; 3853 } 3854 else 3855 unresolved_reloc = FALSE; 3856 } 3857 else if (bfd_link_pic (info)) /* && h == NULL */ 3858 /* Process local symbol during dynamic link. */ 3859 { 3860 if (srela == NULL) 3861 { 3862 srela = bfd_get_linker_section (dynobj, ".rela.got"); 3863 BFD_ASSERT (srela != NULL); 3864 } 3865 3866 elf_m68k_init_got_entry_local_shared (info, 3867 output_bfd, 3868 r_type, 3869 sgot, 3870 off, 3871 relocation, 3872 srela); 3873 3874 *off_ptr |= 1; 3875 } 3876 else /* h == NULL && !bfd_link_pic (info) */ 3877 { 3878 elf_m68k_init_got_entry_static (info, 3879 output_bfd, 3880 r_type, 3881 sgot, 3882 off, 3883 relocation); 3884 3885 *off_ptr |= 1; 3886 } 3887 } 3888 3889 /* We don't use elf_m68k_reloc_got_type in the condition below 3890 because this is the only place where difference between 3891 R_68K_GOTx and R_68K_GOTxO relocations matters. */ 3892 if (r_type == R_68K_GOT32O 3893 || r_type == R_68K_GOT16O 3894 || r_type == R_68K_GOT8O 3895 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_GD32 3896 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_LDM32 3897 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_IE32) 3898 { 3899 /* GOT pointer is adjusted to point to the start/middle 3900 of local GOT. Adjust the offset accordingly. */ 3901 BFD_ASSERT (elf_m68k_hash_table (info)->use_neg_got_offsets_p 3902 || off >= got->offset); 3903 3904 if (elf_m68k_hash_table (info)->local_gp_p) 3905 relocation = off - got->offset; 3906 else 3907 { 3908 BFD_ASSERT (got->offset == 0); 3909 relocation = sgot->output_offset + off; 3910 } 3911 3912 /* This relocation does not use the addend. */ 3913 rel->r_addend = 0; 3914 } 3915 else 3916 relocation = (sgot->output_section->vma + sgot->output_offset 3917 + off); 3918 } 3919 break; 3920 3921 case R_68K_TLS_LDO32: 3922 case R_68K_TLS_LDO16: 3923 case R_68K_TLS_LDO8: 3924 relocation -= dtpoff_base (info); 3925 break; 3926 3927 case R_68K_TLS_LE32: 3928 case R_68K_TLS_LE16: 3929 case R_68K_TLS_LE8: 3930 if (bfd_link_dll (info)) 3931 { 3932 (*_bfd_error_handler) 3933 (_("%B(%A+0x%lx): R_68K_TLS_LE32 relocation not permitted " 3934 "in shared object"), 3935 input_bfd, input_section, (long) rel->r_offset, howto->name); 3936 3937 return FALSE; 3938 } 3939 else 3940 relocation -= tpoff_base (info); 3941 3942 break; 3943 3944 case R_68K_PLT8: 3945 case R_68K_PLT16: 3946 case R_68K_PLT32: 3947 /* Relocation is to the entry for this symbol in the 3948 procedure linkage table. */ 3949 3950 /* Resolve a PLTxx reloc against a local symbol directly, 3951 without using the procedure linkage table. */ 3952 if (h == NULL) 3953 break; 3954 3955 if (h->plt.offset == (bfd_vma) -1 3956 || !elf_hash_table (info)->dynamic_sections_created) 3957 { 3958 /* We didn't make a PLT entry for this symbol. This 3959 happens when statically linking PIC code, or when 3960 using -Bsymbolic. */ 3961 break; 3962 } 3963 3964 if (splt == NULL) 3965 { 3966 splt = bfd_get_linker_section (dynobj, ".plt"); 3967 BFD_ASSERT (splt != NULL); 3968 } 3969 3970 relocation = (splt->output_section->vma 3971 + splt->output_offset 3972 + h->plt.offset); 3973 unresolved_reloc = FALSE; 3974 break; 3975 3976 case R_68K_PLT8O: 3977 case R_68K_PLT16O: 3978 case R_68K_PLT32O: 3979 /* Relocation is the offset of the entry for this symbol in 3980 the procedure linkage table. */ 3981 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); 3982 3983 if (splt == NULL) 3984 { 3985 splt = bfd_get_linker_section (dynobj, ".plt"); 3986 BFD_ASSERT (splt != NULL); 3987 } 3988 3989 relocation = h->plt.offset; 3990 unresolved_reloc = FALSE; 3991 3992 /* This relocation does not use the addend. */ 3993 rel->r_addend = 0; 3994 3995 break; 3996 3997 case R_68K_8: 3998 case R_68K_16: 3999 case R_68K_32: 4000 case R_68K_PC8: 4001 case R_68K_PC16: 4002 case R_68K_PC32: 4003 if (bfd_link_pic (info) 4004 && r_symndx != STN_UNDEF 4005 && (input_section->flags & SEC_ALLOC) != 0 4006 && (h == NULL 4007 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 4008 || h->root.type != bfd_link_hash_undefweak) 4009 && ((r_type != R_68K_PC8 4010 && r_type != R_68K_PC16 4011 && r_type != R_68K_PC32) 4012 || !SYMBOL_CALLS_LOCAL (info, h))) 4013 { 4014 Elf_Internal_Rela outrel; 4015 bfd_byte *loc; 4016 bfd_boolean skip, relocate; 4017 4018 /* When generating a shared object, these relocations 4019 are copied into the output file to be resolved at run 4020 time. */ 4021 4022 skip = FALSE; 4023 relocate = FALSE; 4024 4025 outrel.r_offset = 4026 _bfd_elf_section_offset (output_bfd, info, input_section, 4027 rel->r_offset); 4028 if (outrel.r_offset == (bfd_vma) -1) 4029 skip = TRUE; 4030 else if (outrel.r_offset == (bfd_vma) -2) 4031 skip = TRUE, relocate = TRUE; 4032 outrel.r_offset += (input_section->output_section->vma 4033 + input_section->output_offset); 4034 4035 if (skip) 4036 memset (&outrel, 0, sizeof outrel); 4037 else if (h != NULL 4038 && h->dynindx != -1 4039 && (r_type == R_68K_PC8 4040 || r_type == R_68K_PC16 4041 || r_type == R_68K_PC32 4042 || !bfd_link_pic (info) 4043 || !SYMBOLIC_BIND (info, h) 4044 || !h->def_regular)) 4045 { 4046 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 4047 outrel.r_addend = rel->r_addend; 4048 } 4049 else 4050 { 4051 /* This symbol is local, or marked to become local. */ 4052 outrel.r_addend = relocation + rel->r_addend; 4053 4054 if (r_type == R_68K_32) 4055 { 4056 relocate = TRUE; 4057 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 4058 } 4059 else 4060 { 4061 long indx; 4062 4063 if (bfd_is_abs_section (sec)) 4064 indx = 0; 4065 else if (sec == NULL || sec->owner == NULL) 4066 { 4067 bfd_set_error (bfd_error_bad_value); 4068 return FALSE; 4069 } 4070 else 4071 { 4072 asection *osec; 4073 4074 /* We are turning this relocation into one 4075 against a section symbol. It would be 4076 proper to subtract the symbol's value, 4077 osec->vma, from the emitted reloc addend, 4078 but ld.so expects buggy relocs. */ 4079 osec = sec->output_section; 4080 indx = elf_section_data (osec)->dynindx; 4081 if (indx == 0) 4082 { 4083 struct elf_link_hash_table *htab; 4084 htab = elf_hash_table (info); 4085 osec = htab->text_index_section; 4086 indx = elf_section_data (osec)->dynindx; 4087 } 4088 BFD_ASSERT (indx != 0); 4089 } 4090 4091 outrel.r_info = ELF32_R_INFO (indx, r_type); 4092 } 4093 } 4094 4095 sreloc = elf_section_data (input_section)->sreloc; 4096 if (sreloc == NULL) 4097 abort (); 4098 4099 loc = sreloc->contents; 4100 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 4101 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 4102 4103 /* This reloc will be computed at runtime, so there's no 4104 need to do anything now, except for R_68K_32 4105 relocations that have been turned into 4106 R_68K_RELATIVE. */ 4107 if (!relocate) 4108 continue; 4109 } 4110 4111 break; 4112 4113 case R_68K_GNU_VTINHERIT: 4114 case R_68K_GNU_VTENTRY: 4115 /* These are no-ops in the end. */ 4116 continue; 4117 4118 default: 4119 break; 4120 } 4121 4122 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 4123 because such sections are not SEC_ALLOC and thus ld.so will 4124 not process them. */ 4125 if (unresolved_reloc 4126 && !((input_section->flags & SEC_DEBUGGING) != 0 4127 && h->def_dynamic) 4128 && _bfd_elf_section_offset (output_bfd, info, input_section, 4129 rel->r_offset) != (bfd_vma) -1) 4130 { 4131 (*_bfd_error_handler) 4132 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 4133 input_bfd, 4134 input_section, 4135 (long) rel->r_offset, 4136 howto->name, 4137 h->root.root.string); 4138 return FALSE; 4139 } 4140 4141 if (r_symndx != STN_UNDEF 4142 && r_type != R_68K_NONE 4143 && (h == NULL 4144 || h->root.type == bfd_link_hash_defined 4145 || h->root.type == bfd_link_hash_defweak)) 4146 { 4147 char sym_type; 4148 4149 sym_type = (sym != NULL) ? ELF32_ST_TYPE (sym->st_info) : h->type; 4150 4151 if (elf_m68k_reloc_tls_p (r_type) != (sym_type == STT_TLS)) 4152 { 4153 const char *name; 4154 4155 if (h != NULL) 4156 name = h->root.root.string; 4157 else 4158 { 4159 name = (bfd_elf_string_from_elf_section 4160 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 4161 if (name == NULL || *name == '\0') 4162 name = bfd_section_name (input_bfd, sec); 4163 } 4164 4165 (*_bfd_error_handler) 4166 ((sym_type == STT_TLS 4167 ? _("%B(%A+0x%lx): %s used with TLS symbol %s") 4168 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s")), 4169 input_bfd, 4170 input_section, 4171 (long) rel->r_offset, 4172 howto->name, 4173 name); 4174 } 4175 } 4176 4177 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 4178 contents, rel->r_offset, 4179 relocation, rel->r_addend); 4180 4181 if (r != bfd_reloc_ok) 4182 { 4183 const char *name; 4184 4185 if (h != NULL) 4186 name = h->root.root.string; 4187 else 4188 { 4189 name = bfd_elf_string_from_elf_section (input_bfd, 4190 symtab_hdr->sh_link, 4191 sym->st_name); 4192 if (name == NULL) 4193 return FALSE; 4194 if (*name == '\0') 4195 name = bfd_section_name (input_bfd, sec); 4196 } 4197 4198 if (r == bfd_reloc_overflow) 4199 (*info->callbacks->reloc_overflow) 4200 (info, (h ? &h->root : NULL), name, howto->name, 4201 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 4202 else 4203 { 4204 (*_bfd_error_handler) 4205 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 4206 input_bfd, input_section, 4207 (long) rel->r_offset, name, (int) r); 4208 return FALSE; 4209 } 4210 } 4211 } 4212 4213 return TRUE; 4214 } 4215 4216 /* Install an M_68K_PC32 relocation against VALUE at offset OFFSET 4217 into section SEC. */ 4218 4219 static void 4220 elf_m68k_install_pc32 (asection *sec, bfd_vma offset, bfd_vma value) 4221 { 4222 /* Make VALUE PC-relative. */ 4223 value -= sec->output_section->vma + offset; 4224 4225 /* Apply any in-place addend. */ 4226 value += bfd_get_32 (sec->owner, sec->contents + offset); 4227 4228 bfd_put_32 (sec->owner, value, sec->contents + offset); 4229 } 4230 4231 /* Finish up dynamic symbol handling. We set the contents of various 4232 dynamic sections here. */ 4233 4234 static bfd_boolean 4235 elf_m68k_finish_dynamic_symbol (bfd *output_bfd, 4236 struct bfd_link_info *info, 4237 struct elf_link_hash_entry *h, 4238 Elf_Internal_Sym *sym) 4239 { 4240 bfd *dynobj; 4241 4242 dynobj = elf_hash_table (info)->dynobj; 4243 4244 if (h->plt.offset != (bfd_vma) -1) 4245 { 4246 const struct elf_m68k_plt_info *plt_info; 4247 asection *splt; 4248 asection *sgot; 4249 asection *srela; 4250 bfd_vma plt_index; 4251 bfd_vma got_offset; 4252 Elf_Internal_Rela rela; 4253 bfd_byte *loc; 4254 4255 /* This symbol has an entry in the procedure linkage table. Set 4256 it up. */ 4257 4258 BFD_ASSERT (h->dynindx != -1); 4259 4260 plt_info = elf_m68k_hash_table (info)->plt_info; 4261 splt = bfd_get_linker_section (dynobj, ".plt"); 4262 sgot = bfd_get_linker_section (dynobj, ".got.plt"); 4263 srela = bfd_get_linker_section (dynobj, ".rela.plt"); 4264 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 4265 4266 /* Get the index in the procedure linkage table which 4267 corresponds to this symbol. This is the index of this symbol 4268 in all the symbols for which we are making plt entries. The 4269 first entry in the procedure linkage table is reserved. */ 4270 plt_index = (h->plt.offset / plt_info->size) - 1; 4271 4272 /* Get the offset into the .got table of the entry that 4273 corresponds to this function. Each .got entry is 4 bytes. 4274 The first three are reserved. */ 4275 got_offset = (plt_index + 3) * 4; 4276 4277 memcpy (splt->contents + h->plt.offset, 4278 plt_info->symbol_entry, 4279 plt_info->size); 4280 4281 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.got, 4282 (sgot->output_section->vma 4283 + sgot->output_offset 4284 + got_offset)); 4285 4286 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 4287 splt->contents 4288 + h->plt.offset 4289 + plt_info->symbol_resolve_entry + 2); 4290 4291 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.plt, 4292 splt->output_section->vma); 4293 4294 /* Fill in the entry in the global offset table. */ 4295 bfd_put_32 (output_bfd, 4296 (splt->output_section->vma 4297 + splt->output_offset 4298 + h->plt.offset 4299 + plt_info->symbol_resolve_entry), 4300 sgot->contents + got_offset); 4301 4302 /* Fill in the entry in the .rela.plt section. */ 4303 rela.r_offset = (sgot->output_section->vma 4304 + sgot->output_offset 4305 + got_offset); 4306 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); 4307 rela.r_addend = 0; 4308 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 4309 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4310 4311 if (!h->def_regular) 4312 { 4313 /* Mark the symbol as undefined, rather than as defined in 4314 the .plt section. Leave the value alone. */ 4315 sym->st_shndx = SHN_UNDEF; 4316 } 4317 } 4318 4319 if (elf_m68k_hash_entry (h)->glist != NULL) 4320 { 4321 asection *sgot; 4322 asection *srela; 4323 struct elf_m68k_got_entry *got_entry; 4324 4325 /* This symbol has an entry in the global offset table. Set it 4326 up. */ 4327 4328 sgot = bfd_get_linker_section (dynobj, ".got"); 4329 srela = bfd_get_linker_section (dynobj, ".rela.got"); 4330 BFD_ASSERT (sgot != NULL && srela != NULL); 4331 4332 got_entry = elf_m68k_hash_entry (h)->glist; 4333 4334 while (got_entry != NULL) 4335 { 4336 enum elf_m68k_reloc_type r_type; 4337 bfd_vma got_entry_offset; 4338 4339 r_type = got_entry->key_.type; 4340 got_entry_offset = got_entry->u.s2.offset &~ (bfd_vma) 1; 4341 4342 /* If this is a -Bsymbolic link, and the symbol is defined 4343 locally, we just want to emit a RELATIVE reloc. Likewise if 4344 the symbol was forced to be local because of a version file. 4345 The entry in the global offset table already have been 4346 initialized in the relocate_section function. */ 4347 if (bfd_link_pic (info) 4348 && SYMBOL_REFERENCES_LOCAL (info, h)) 4349 { 4350 bfd_vma relocation; 4351 4352 relocation = bfd_get_signed_32 (output_bfd, 4353 (sgot->contents 4354 + got_entry_offset)); 4355 4356 /* Undo TP bias. */ 4357 switch (elf_m68k_reloc_got_type (r_type)) 4358 { 4359 case R_68K_GOT32O: 4360 case R_68K_TLS_LDM32: 4361 break; 4362 4363 case R_68K_TLS_GD32: 4364 /* The value for this relocation is actually put in 4365 the second GOT slot. */ 4366 relocation = bfd_get_signed_32 (output_bfd, 4367 (sgot->contents 4368 + got_entry_offset + 4)); 4369 relocation += dtpoff_base (info); 4370 break; 4371 4372 case R_68K_TLS_IE32: 4373 relocation += tpoff_base (info); 4374 break; 4375 4376 default: 4377 BFD_ASSERT (FALSE); 4378 } 4379 4380 elf_m68k_init_got_entry_local_shared (info, 4381 output_bfd, 4382 r_type, 4383 sgot, 4384 got_entry_offset, 4385 relocation, 4386 srela); 4387 } 4388 else 4389 { 4390 Elf_Internal_Rela rela; 4391 4392 /* Put zeros to GOT slots that will be initialized 4393 at run-time. */ 4394 { 4395 bfd_vma n_slots; 4396 4397 n_slots = elf_m68k_reloc_got_n_slots (got_entry->key_.type); 4398 while (n_slots--) 4399 bfd_put_32 (output_bfd, (bfd_vma) 0, 4400 (sgot->contents + got_entry_offset 4401 + 4 * n_slots)); 4402 } 4403 4404 rela.r_addend = 0; 4405 rela.r_offset = (sgot->output_section->vma 4406 + sgot->output_offset 4407 + got_entry_offset); 4408 4409 switch (elf_m68k_reloc_got_type (r_type)) 4410 { 4411 case R_68K_GOT32O: 4412 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); 4413 elf_m68k_install_rela (output_bfd, srela, &rela); 4414 break; 4415 4416 case R_68K_TLS_GD32: 4417 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPMOD32); 4418 elf_m68k_install_rela (output_bfd, srela, &rela); 4419 4420 rela.r_offset += 4; 4421 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPREL32); 4422 elf_m68k_install_rela (output_bfd, srela, &rela); 4423 break; 4424 4425 case R_68K_TLS_IE32: 4426 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_TPREL32); 4427 elf_m68k_install_rela (output_bfd, srela, &rela); 4428 break; 4429 4430 default: 4431 BFD_ASSERT (FALSE); 4432 break; 4433 } 4434 } 4435 4436 got_entry = got_entry->u.s2.next; 4437 } 4438 } 4439 4440 if (h->needs_copy) 4441 { 4442 asection *s; 4443 Elf_Internal_Rela rela; 4444 bfd_byte *loc; 4445 4446 /* This symbol needs a copy reloc. Set it up. */ 4447 4448 BFD_ASSERT (h->dynindx != -1 4449 && (h->root.type == bfd_link_hash_defined 4450 || h->root.type == bfd_link_hash_defweak)); 4451 4452 s = bfd_get_linker_section (dynobj, ".rela.bss"); 4453 BFD_ASSERT (s != NULL); 4454 4455 rela.r_offset = (h->root.u.def.value 4456 + h->root.u.def.section->output_section->vma 4457 + h->root.u.def.section->output_offset); 4458 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); 4459 rela.r_addend = 0; 4460 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 4461 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4462 } 4463 4464 return TRUE; 4465 } 4466 4467 /* Finish up the dynamic sections. */ 4468 4469 static bfd_boolean 4470 elf_m68k_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 4471 { 4472 bfd *dynobj; 4473 asection *sgot; 4474 asection *sdyn; 4475 4476 dynobj = elf_hash_table (info)->dynobj; 4477 4478 sgot = bfd_get_linker_section (dynobj, ".got.plt"); 4479 BFD_ASSERT (sgot != NULL); 4480 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 4481 4482 if (elf_hash_table (info)->dynamic_sections_created) 4483 { 4484 asection *splt; 4485 Elf32_External_Dyn *dyncon, *dynconend; 4486 4487 splt = bfd_get_linker_section (dynobj, ".plt"); 4488 BFD_ASSERT (splt != NULL && sdyn != NULL); 4489 4490 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4491 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 4492 for (; dyncon < dynconend; dyncon++) 4493 { 4494 Elf_Internal_Dyn dyn; 4495 const char *name; 4496 asection *s; 4497 4498 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4499 4500 switch (dyn.d_tag) 4501 { 4502 default: 4503 break; 4504 4505 case DT_PLTGOT: 4506 name = ".got.plt"; 4507 goto get_vma; 4508 case DT_JMPREL: 4509 name = ".rela.plt"; 4510 get_vma: 4511 s = bfd_get_linker_section (dynobj, name); 4512 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 4513 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4514 break; 4515 4516 case DT_PLTRELSZ: 4517 s = bfd_get_linker_section (dynobj, ".rela.plt"); 4518 dyn.d_un.d_val = s->size; 4519 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4520 break; 4521 4522 case DT_RELASZ: 4523 /* The procedure linkage table relocs (DT_JMPREL) should 4524 not be included in the overall relocs (DT_RELA). 4525 Therefore, we override the DT_RELASZ entry here to 4526 make it not include the JMPREL relocs. Since the 4527 linker script arranges for .rela.plt to follow all 4528 other relocation sections, we don't have to worry 4529 about changing the DT_RELA entry. */ 4530 s = bfd_get_linker_section (dynobj, ".rela.plt"); 4531 if (s != NULL) 4532 dyn.d_un.d_val -= s->size; 4533 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4534 break; 4535 } 4536 } 4537 4538 /* Fill in the first entry in the procedure linkage table. */ 4539 if (splt->size > 0) 4540 { 4541 const struct elf_m68k_plt_info *plt_info; 4542 4543 plt_info = elf_m68k_hash_table (info)->plt_info; 4544 memcpy (splt->contents, plt_info->plt0_entry, plt_info->size); 4545 4546 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got4, 4547 (sgot->output_section->vma 4548 + sgot->output_offset 4549 + 4)); 4550 4551 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got8, 4552 (sgot->output_section->vma 4553 + sgot->output_offset 4554 + 8)); 4555 4556 elf_section_data (splt->output_section)->this_hdr.sh_entsize 4557 = plt_info->size; 4558 } 4559 } 4560 4561 /* Fill in the first three entries in the global offset table. */ 4562 if (sgot->size > 0) 4563 { 4564 if (sdyn == NULL) 4565 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 4566 else 4567 bfd_put_32 (output_bfd, 4568 sdyn->output_section->vma + sdyn->output_offset, 4569 sgot->contents); 4570 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 4571 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 4572 } 4573 4574 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 4575 4576 return TRUE; 4577 } 4578 4579 /* Given a .data section and a .emreloc in-memory section, store 4580 relocation information into the .emreloc section which can be 4581 used at runtime to relocate the section. This is called by the 4582 linker when the --embedded-relocs switch is used. This is called 4583 after the add_symbols entry point has been called for all the 4584 objects, and before the final_link entry point is called. */ 4585 4586 bfd_boolean 4587 bfd_m68k_elf32_create_embedded_relocs (bfd *abfd, struct bfd_link_info *info, 4588 asection *datasec, asection *relsec, 4589 char **errmsg) 4590 { 4591 Elf_Internal_Shdr *symtab_hdr; 4592 Elf_Internal_Sym *isymbuf = NULL; 4593 Elf_Internal_Rela *internal_relocs = NULL; 4594 Elf_Internal_Rela *irel, *irelend; 4595 bfd_byte *p; 4596 bfd_size_type amt; 4597 4598 BFD_ASSERT (! bfd_link_relocatable (info)); 4599 4600 *errmsg = NULL; 4601 4602 if (datasec->reloc_count == 0) 4603 return TRUE; 4604 4605 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4606 4607 /* Get a copy of the native relocations. */ 4608 internal_relocs = (_bfd_elf_link_read_relocs 4609 (abfd, datasec, NULL, (Elf_Internal_Rela *) NULL, 4610 info->keep_memory)); 4611 if (internal_relocs == NULL) 4612 goto error_return; 4613 4614 amt = (bfd_size_type) datasec->reloc_count * 12; 4615 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 4616 if (relsec->contents == NULL) 4617 goto error_return; 4618 4619 p = relsec->contents; 4620 4621 irelend = internal_relocs + datasec->reloc_count; 4622 for (irel = internal_relocs; irel < irelend; irel++, p += 12) 4623 { 4624 asection *targetsec; 4625 4626 /* We are going to write a four byte longword into the runtime 4627 reloc section. The longword will be the address in the data 4628 section which must be relocated. It is followed by the name 4629 of the target section NUL-padded or truncated to 8 4630 characters. */ 4631 4632 /* We can only relocate absolute longword relocs at run time. */ 4633 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32) 4634 { 4635 *errmsg = _("unsupported reloc type"); 4636 bfd_set_error (bfd_error_bad_value); 4637 goto error_return; 4638 } 4639 4640 /* Get the target section referred to by the reloc. */ 4641 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 4642 { 4643 /* A local symbol. */ 4644 Elf_Internal_Sym *isym; 4645 4646 /* Read this BFD's local symbols if we haven't done so already. */ 4647 if (isymbuf == NULL) 4648 { 4649 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 4650 if (isymbuf == NULL) 4651 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 4652 symtab_hdr->sh_info, 0, 4653 NULL, NULL, NULL); 4654 if (isymbuf == NULL) 4655 goto error_return; 4656 } 4657 4658 isym = isymbuf + ELF32_R_SYM (irel->r_info); 4659 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 4660 } 4661 else 4662 { 4663 unsigned long indx; 4664 struct elf_link_hash_entry *h; 4665 4666 /* An external symbol. */ 4667 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 4668 h = elf_sym_hashes (abfd)[indx]; 4669 BFD_ASSERT (h != NULL); 4670 if (h->root.type == bfd_link_hash_defined 4671 || h->root.type == bfd_link_hash_defweak) 4672 targetsec = h->root.u.def.section; 4673 else 4674 targetsec = NULL; 4675 } 4676 4677 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 4678 memset (p + 4, 0, 8); 4679 if (targetsec != NULL) 4680 strncpy ((char *) p + 4, targetsec->output_section->name, 8); 4681 } 4682 4683 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 4684 free (isymbuf); 4685 if (internal_relocs != NULL 4686 && elf_section_data (datasec)->relocs != internal_relocs) 4687 free (internal_relocs); 4688 return TRUE; 4689 4690 error_return: 4691 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 4692 free (isymbuf); 4693 if (internal_relocs != NULL 4694 && elf_section_data (datasec)->relocs != internal_relocs) 4695 free (internal_relocs); 4696 return FALSE; 4697 } 4698 4699 /* Set target options. */ 4700 4701 void 4702 bfd_elf_m68k_set_target_options (struct bfd_link_info *info, int got_handling) 4703 { 4704 struct elf_m68k_link_hash_table *htab; 4705 bfd_boolean use_neg_got_offsets_p; 4706 bfd_boolean allow_multigot_p; 4707 bfd_boolean local_gp_p; 4708 4709 switch (got_handling) 4710 { 4711 case 0: 4712 /* --got=single. */ 4713 local_gp_p = FALSE; 4714 use_neg_got_offsets_p = FALSE; 4715 allow_multigot_p = FALSE; 4716 break; 4717 4718 case 1: 4719 /* --got=negative. */ 4720 local_gp_p = TRUE; 4721 use_neg_got_offsets_p = TRUE; 4722 allow_multigot_p = FALSE; 4723 break; 4724 4725 case 2: 4726 /* --got=multigot. */ 4727 local_gp_p = TRUE; 4728 use_neg_got_offsets_p = TRUE; 4729 allow_multigot_p = TRUE; 4730 break; 4731 4732 default: 4733 BFD_ASSERT (FALSE); 4734 return; 4735 } 4736 4737 htab = elf_m68k_hash_table (info); 4738 if (htab != NULL) 4739 { 4740 htab->local_gp_p = local_gp_p; 4741 htab->use_neg_got_offsets_p = use_neg_got_offsets_p; 4742 htab->allow_multigot_p = allow_multigot_p; 4743 } 4744 } 4745 4746 static enum elf_reloc_type_class 4747 elf32_m68k_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 4748 const asection *rel_sec ATTRIBUTE_UNUSED, 4749 const Elf_Internal_Rela *rela) 4750 { 4751 switch ((int) ELF32_R_TYPE (rela->r_info)) 4752 { 4753 case R_68K_RELATIVE: 4754 return reloc_class_relative; 4755 case R_68K_JMP_SLOT: 4756 return reloc_class_plt; 4757 case R_68K_COPY: 4758 return reloc_class_copy; 4759 default: 4760 return reloc_class_normal; 4761 } 4762 } 4763 4764 /* Return address for Ith PLT stub in section PLT, for relocation REL 4765 or (bfd_vma) -1 if it should not be included. */ 4766 4767 static bfd_vma 4768 elf_m68k_plt_sym_val (bfd_vma i, const asection *plt, 4769 const arelent *rel ATTRIBUTE_UNUSED) 4770 { 4771 return plt->vma + (i + 1) * elf_m68k_get_plt_info (plt->owner)->size; 4772 } 4773 4774 /* Support for core dump NOTE sections. */ 4775 4776 static bfd_boolean 4777 elf_m68k_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 4778 { 4779 int offset; 4780 size_t size; 4781 4782 switch (note->descsz) 4783 { 4784 default: 4785 return FALSE; 4786 4787 case 154: /* Linux/m68k */ 4788 /* pr_cursig */ 4789 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 4790 4791 /* pr_pid */ 4792 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 22); 4793 4794 /* pr_reg */ 4795 offset = 70; 4796 size = 80; 4797 4798 break; 4799 } 4800 4801 /* Make a ".reg/999" section. */ 4802 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 4803 size, note->descpos + offset); 4804 } 4805 4806 static bfd_boolean 4807 elf_m68k_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 4808 { 4809 switch (note->descsz) 4810 { 4811 default: 4812 return FALSE; 4813 4814 case 124: /* Linux/m68k elf_prpsinfo. */ 4815 elf_tdata (abfd)->core->pid 4816 = bfd_get_32 (abfd, note->descdata + 12); 4817 elf_tdata (abfd)->core->program 4818 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 4819 elf_tdata (abfd)->core->command 4820 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 4821 } 4822 4823 /* Note that for some reason, a spurious space is tacked 4824 onto the end of the args in some (at least one anyway) 4825 implementations, so strip it off if it exists. */ 4826 { 4827 char *command = elf_tdata (abfd)->core->command; 4828 int n = strlen (command); 4829 4830 if (n > 0 && command[n - 1] == ' ') 4831 command[n - 1] = '\0'; 4832 } 4833 4834 return TRUE; 4835 } 4836 4837 /* Hook called by the linker routine which adds symbols from an object 4838 file. */ 4839 4840 static bfd_boolean 4841 elf_m68k_add_symbol_hook (bfd *abfd, 4842 struct bfd_link_info *info, 4843 Elf_Internal_Sym *sym, 4844 const char **namep ATTRIBUTE_UNUSED, 4845 flagword *flagsp ATTRIBUTE_UNUSED, 4846 asection **secp ATTRIBUTE_UNUSED, 4847 bfd_vma *valp ATTRIBUTE_UNUSED) 4848 { 4849 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC 4850 && (abfd->flags & DYNAMIC) == 0 4851 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour) 4852 elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc; 4853 4854 return TRUE; 4855 } 4856 4857 #define TARGET_BIG_SYM m68k_elf32_vec 4858 #define TARGET_BIG_NAME "elf32-m68k" 4859 #define ELF_MACHINE_CODE EM_68K 4860 #define ELF_MAXPAGESIZE 0x2000 4861 #define elf_backend_create_dynamic_sections \ 4862 _bfd_elf_create_dynamic_sections 4863 #define bfd_elf32_bfd_link_hash_table_create \ 4864 elf_m68k_link_hash_table_create 4865 #define bfd_elf32_bfd_final_link bfd_elf_final_link 4866 4867 #define elf_backend_check_relocs elf_m68k_check_relocs 4868 #define elf_backend_always_size_sections \ 4869 elf_m68k_always_size_sections 4870 #define elf_backend_adjust_dynamic_symbol \ 4871 elf_m68k_adjust_dynamic_symbol 4872 #define elf_backend_size_dynamic_sections \ 4873 elf_m68k_size_dynamic_sections 4874 #define elf_backend_final_write_processing elf_m68k_final_write_processing 4875 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 4876 #define elf_backend_relocate_section elf_m68k_relocate_section 4877 #define elf_backend_finish_dynamic_symbol \ 4878 elf_m68k_finish_dynamic_symbol 4879 #define elf_backend_finish_dynamic_sections \ 4880 elf_m68k_finish_dynamic_sections 4881 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook 4882 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook 4883 #define elf_backend_copy_indirect_symbol elf_m68k_copy_indirect_symbol 4884 #define bfd_elf32_bfd_merge_private_bfd_data \ 4885 elf32_m68k_merge_private_bfd_data 4886 #define bfd_elf32_bfd_set_private_flags \ 4887 elf32_m68k_set_private_flags 4888 #define bfd_elf32_bfd_print_private_bfd_data \ 4889 elf32_m68k_print_private_bfd_data 4890 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class 4891 #define elf_backend_plt_sym_val elf_m68k_plt_sym_val 4892 #define elf_backend_object_p elf32_m68k_object_p 4893 #define elf_backend_grok_prstatus elf_m68k_grok_prstatus 4894 #define elf_backend_grok_psinfo elf_m68k_grok_psinfo 4895 #define elf_backend_add_symbol_hook elf_m68k_add_symbol_hook 4896 4897 #define elf_backend_can_gc_sections 1 4898 #define elf_backend_can_refcount 1 4899 #define elf_backend_want_got_plt 1 4900 #define elf_backend_plt_readonly 1 4901 #define elf_backend_want_plt_sym 0 4902 #define elf_backend_got_header_size 12 4903 #define elf_backend_rela_normal 1 4904 4905 #include "elf32-target.h" 4906