1 /* x86 specific support for ELF 2 Copyright (C) 2017-2018 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 "bfd_stdint.h" 27 #include "hashtab.h" 28 29 #define PLT_CIE_LENGTH 20 30 #define PLT_FDE_LENGTH 36 31 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 32 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 33 34 #define ABI_64_P(abfd) \ 35 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64) 36 37 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 38 copying dynamic variables from a shared lib into an app's dynbss 39 section, and instead use a dynamic relocation to point into the 40 shared lib. */ 41 #define ELIMINATE_COPY_RELOCS 1 42 43 #define elf_x86_hash_table(p, id) \ 44 (is_elf_hash_table ((p)->hash) \ 45 && elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \ 46 ? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL) 47 48 /* Will references to this symbol always be local in this object? */ 49 #define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \ 50 _bfd_x86_elf_link_symbol_references_local ((INFO), (H)) 51 52 /* TRUE if an undefined weak symbol should be resolved to 0. Local 53 undefined weak symbol is always resolved to 0. Reference to an 54 undefined weak symbol is resolved to 0 in executable if undefined 55 weak symbol should be resolved to 0 (zero_undefweak > 0). */ 56 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \ 57 ((EH)->elf.root.type == bfd_link_hash_undefweak \ 58 && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf) \ 59 || (bfd_link_executable (INFO) \ 60 && (EH)->zero_undefweak > 0))) 61 62 /* Should copy relocation be generated for a symbol. Don't generate 63 copy relocation against a protected symbol defined in a shared 64 object with GNU_PROPERTY_NO_COPY_ON_PROTECTED. */ 65 #define SYMBOL_NO_COPYRELOC(INFO, EH) \ 66 ((EH)->def_protected \ 67 && ((EH)->elf.root.type == bfd_link_hash_defined \ 68 || (EH)->elf.root.type == bfd_link_hash_defweak) \ 69 && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \ 70 && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \ 71 && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0) 72 73 /* TRUE if dynamic relocation is needed. If we are creating a shared 74 library, and this is a reloc against a global symbol, or a non PC 75 relative reloc against a local symbol, then we need to copy the reloc 76 into the shared library. However, if we are linking with -Bsymbolic, 77 we do not need to copy a reloc against a global symbol which is 78 defined in an object we are including in the link (i.e., DEF_REGULAR 79 is set). 80 81 If PCREL_PLT is true, don't generate dynamic relocation in PIE for 82 PC-relative relocation against a dynamic function definition in data 83 section when PLT address can be used. 84 85 If on the other hand, we are creating an executable, we may need to 86 keep relocations for symbols satisfied by a dynamic library if we 87 manage to avoid copy relocs for the symbol. 88 89 We also need to generate dynamic pointer relocation against 90 STT_GNU_IFUNC symbol in the non-code section. */ 91 #define NEED_DYNAMIC_RELOCATION_P(INFO, PCREL_PLT, H, SEC, R_TYPE, \ 92 POINTER_TYPE) \ 93 ((bfd_link_pic (INFO) \ 94 && (! X86_PCREL_TYPE_P (R_TYPE) \ 95 || ((H) != NULL \ 96 && (! (bfd_link_pie (INFO) \ 97 || SYMBOLIC_BIND ((INFO), (H))) \ 98 || (H)->root.type == bfd_link_hash_defweak \ 99 || (!(bfd_link_pie (INFO) \ 100 && (PCREL_PLT) \ 101 && (H)->plt.refcount > 0 \ 102 && ((SEC)->flags & SEC_CODE) == 0 \ 103 && (H)->type == STT_FUNC \ 104 && (H)->def_dynamic) \ 105 && !(H)->def_regular))))) \ 106 || ((H) != NULL \ 107 && (H)->type == STT_GNU_IFUNC \ 108 && (R_TYPE) == POINTER_TYPE \ 109 && ((SEC)->flags & SEC_CODE) == 0) \ 110 || (ELIMINATE_COPY_RELOCS \ 111 && !bfd_link_pic (INFO) \ 112 && (H) != NULL \ 113 && ((H)->root.type == bfd_link_hash_defweak \ 114 || !(H)->def_regular))) 115 116 /* TRUE if dynamic relocation should be generated. Don't copy a 117 pc-relative relocation into the output file if the symbol needs 118 copy reloc or the symbol is undefined when building executable. 119 Copy dynamic function pointer relocations. Don't generate dynamic 120 relocations against resolved undefined weak symbols in PIE, except 121 when PC32_RELOC is TRUE. Undefined weak symbol is bound locally 122 when PIC is false. */ 123 #define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, \ 124 NEED_COPY_RELOC_IN_PIE, \ 125 RESOLVED_TO_ZERO, PC32_RELOC) \ 126 ((bfd_link_pic (INFO) \ 127 && !(NEED_COPY_RELOC_IN_PIE) \ 128 && ((EH) == NULL \ 129 || ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \ 130 && (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \ 131 || (EH)->elf.root.type != bfd_link_hash_undefweak)) \ 132 && ((!X86_PCREL_TYPE_P (R_TYPE) \ 133 && !X86_SIZE_TYPE_P (R_TYPE)) \ 134 || ! SYMBOL_CALLS_LOCAL ((INFO), &(EH)->elf))) \ 135 || (ELIMINATE_COPY_RELOCS \ 136 && !bfd_link_pic (INFO) \ 137 && (EH) != NULL \ 138 && (EH)->elf.dynindx != -1 \ 139 && (!(EH)->elf.non_got_ref \ 140 || ((EH)->elf.root.type == bfd_link_hash_undefweak \ 141 && !(RESOLVED_TO_ZERO))) \ 142 && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \ 143 || (EH)->elf.root.type == bfd_link_hash_undefined))) 144 145 /* TRUE if this input relocation should be copied to output. H->dynindx 146 may be -1 if this symbol was marked to become local. */ 147 #define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \ 148 ((H) != NULL \ 149 && (H)->dynindx != -1 \ 150 && (X86_PCREL_TYPE_P (R_TYPE) \ 151 || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \ 152 || !(H)->def_regular)) 153 154 /* TRUE if this is actually a static link, or it is a -Bsymbolic link 155 and the symbol is defined locally, or the symbol was forced to be 156 local because of a version file. */ 157 #define RESOLVED_LOCALLY_P(INFO, H, HTAB) \ 158 (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \ 159 bfd_link_pic (INFO), (H)) \ 160 || (bfd_link_pic (INFO) \ 161 && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \ 162 || (ELF_ST_VISIBILITY ((H)->other) \ 163 && (H)->root.type == bfd_link_hash_undefweak)) 164 165 /* TRUE if relative relocation should be generated. GOT reference to 166 global symbol in PIC will lead to dynamic symbol. It becomes a 167 problem when "time" or "times" is defined as a variable in an 168 executable, clashing with functions of the same name in libc. If a 169 symbol isn't undefined weak symbol, don't make it dynamic in PIC and 170 generate relative relocation. */ 171 #define GENERATE_RELATIVE_RELOC_P(INFO, H) \ 172 ((H)->dynindx == -1 \ 173 && !(H)->forced_local \ 174 && (H)->root.type != bfd_link_hash_undefweak \ 175 && bfd_link_pic (INFO)) 176 177 /* TRUE if this is a pointer reference to a local IFUNC. */ 178 #define POINTER_LOCAL_IFUNC_P(INFO, H) \ 179 ((H)->dynindx == -1 \ 180 || (H)->forced_local \ 181 || bfd_link_executable (INFO)) 182 183 /* TRUE if this is a PLT reference to a local IFUNC. */ 184 #define PLT_LOCAL_IFUNC_P(INFO, H) \ 185 ((H)->dynindx == -1 \ 186 || ((bfd_link_executable (INFO) \ 187 || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \ 188 && (H)->def_regular \ 189 && (H)->type == STT_GNU_IFUNC)) 190 191 /* TRUE if TLS IE->LE transition is OK. */ 192 #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \ 193 (bfd_link_executable (INFO) \ 194 && (H) != NULL \ 195 && (H)->dynindx == -1 \ 196 && (TLS_TYPE & GOT_TLS_IE)) 197 198 /* Verify that the symbol has an entry in the procedure linkage table. */ 199 #define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \ 200 do \ 201 { \ 202 if (((H)->dynindx == -1 \ 203 && !LOCAL_UNDEFWEAK \ 204 && !(((H)->forced_local || bfd_link_executable (INFO)) \ 205 && (H)->def_regular \ 206 && (H)->type == STT_GNU_IFUNC)) \ 207 || (PLT) == NULL \ 208 || (GOTPLT) == NULL \ 209 || (RELPLT) == NULL) \ 210 abort (); \ 211 } \ 212 while (0); 213 214 /* Verify that the symbol supports copy relocation. */ 215 #define VERIFY_COPY_RELOC(H, HTAB) \ 216 do \ 217 { \ 218 if ((H)->dynindx == -1 \ 219 || ((H)->root.type != bfd_link_hash_defined \ 220 && (H)->root.type != bfd_link_hash_defweak) \ 221 || (HTAB)->elf.srelbss == NULL \ 222 || (HTAB)->elf.sreldynrelro == NULL) \ 223 abort (); \ 224 } \ 225 while (0); 226 227 /* x86 ELF linker hash entry. */ 228 229 struct elf_x86_link_hash_entry 230 { 231 struct elf_link_hash_entry elf; 232 233 /* Track dynamic relocs copied for this symbol. */ 234 struct elf_dyn_relocs *dyn_relocs; 235 236 unsigned char tls_type; 237 238 /* Bit 0: Symbol has no GOT nor PLT relocations. 239 Bit 1: Symbol has non-GOT/non-PLT relocations in text sections. 240 zero_undefweak is initialized to 1 and undefined weak symbol 241 should be resolved to 0 if zero_undefweak > 0. */ 242 unsigned int zero_undefweak : 2; 243 244 /* Don't call finish_dynamic_symbol on this symbol. */ 245 unsigned int no_finish_dynamic_symbol : 1; 246 247 /* TRUE if symbol is __tls_get_addr. */ 248 unsigned int tls_get_addr : 1; 249 250 /* TRUE if symbol is defined as a protected symbol. */ 251 unsigned int def_protected : 1; 252 253 /* 0: Symbol references are unknown. 254 1: Symbol references aren't local. 255 2: Symbol references are local. 256 */ 257 unsigned int local_ref : 2; 258 259 /* TRUE if symbol is defined by linker. */ 260 unsigned int linker_def : 1; 261 262 /* TRUE if symbol is referenced by R_386_GOTOFF relocation. This is 263 only used by i386. */ 264 unsigned int gotoff_ref : 1; 265 266 /* TRUE if a weak symbol with a real definition needs a copy reloc. 267 When there is a weak symbol with a real definition, the processor 268 independent code will have arranged for us to see the real 269 definition first. We need to copy the needs_copy bit from the 270 real definition and check it when allowing copy reloc in PIE. This 271 is only used by x86-64. */ 272 unsigned int needs_copy : 1; 273 274 /* Information about the GOT PLT entry. Filled when there are both 275 GOT and PLT relocations against the same function. */ 276 union gotplt_union plt_got; 277 278 /* Information about the second PLT entry. */ 279 union gotplt_union plt_second; 280 281 /* Offset of the GOTPLT entry reserved for the TLS descriptor, 282 starting at the end of the jump table. */ 283 bfd_vma tlsdesc_got; 284 }; 285 286 struct elf_x86_lazy_plt_layout 287 { 288 /* The first entry in a lazy procedure linkage table looks like this. */ 289 const bfd_byte *plt0_entry; 290 unsigned int plt0_entry_size; /* Size of PLT0 entry. */ 291 292 /* Later entries in a lazy procedure linkage table look like this. */ 293 const bfd_byte *plt_entry; 294 unsigned int plt_entry_size; /* Size of each PLT entry. */ 295 296 /* The TLSDESC entry in a lazy procedure linkage table looks like 297 this. This is for x86-64 only. */ 298 const bfd_byte *plt_tlsdesc_entry; 299 unsigned int plt_tlsdesc_entry_size; /* Size of TLSDESC entry. */ 300 301 /* Offsets into the TLSDESC entry that are to be replaced with 302 GOT+8 and GOT+TDG. These are for x86-64 only. */ 303 unsigned int plt_tlsdesc_got1_offset; 304 unsigned int plt_tlsdesc_got2_offset; 305 306 /* Offset of the end of the PC-relative instructions containing 307 plt_tlsdesc_got1_offset and plt_tlsdesc_got2_offset. These 308 are for x86-64 only. */ 309 unsigned int plt_tlsdesc_got1_insn_end; 310 unsigned int plt_tlsdesc_got2_insn_end; 311 312 /* Offsets into plt0_entry that are to be replaced with GOT[1] and 313 GOT[2]. */ 314 unsigned int plt0_got1_offset; 315 unsigned int plt0_got2_offset; 316 317 /* Offset of the end of the PC-relative instruction containing 318 plt0_got2_offset. This is for x86-64 only. */ 319 unsigned int plt0_got2_insn_end; 320 321 /* Offsets into plt_entry that are to be replaced with... */ 322 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 323 unsigned int plt_reloc_offset; /* ... offset into relocation table. */ 324 unsigned int plt_plt_offset; /* ... offset to start of .plt. */ 325 326 /* Length of the PC-relative instruction containing plt_got_offset. 327 This is used for x86-64 only. */ 328 unsigned int plt_got_insn_size; 329 330 /* Offset of the end of the PC-relative jump to plt0_entry. This is 331 used for x86-64 only. */ 332 unsigned int plt_plt_insn_end; 333 334 /* Offset into plt_entry where the initial value of the GOT entry 335 points. */ 336 unsigned int plt_lazy_offset; 337 338 /* The first entry in a PIC lazy procedure linkage table looks like 339 this. */ 340 const bfd_byte *pic_plt0_entry; 341 342 /* Subsequent entries in a PIC lazy procedure linkage table look 343 like this. */ 344 const bfd_byte *pic_plt_entry; 345 346 /* .eh_frame covering the lazy .plt section. */ 347 const bfd_byte *eh_frame_plt; 348 unsigned int eh_frame_plt_size; 349 }; 350 351 struct elf_x86_non_lazy_plt_layout 352 { 353 /* Entries in a non-lazy procedure linkage table look like this. */ 354 const bfd_byte *plt_entry; 355 /* Entries in a PIC non-lazy procedure linkage table look like this. 356 This is only used for i386 where absolute PLT and PIC PLT are 357 different. */ 358 const bfd_byte *pic_plt_entry; 359 360 unsigned int plt_entry_size; /* Size of each PLT entry. */ 361 362 /* Offsets into plt_entry that are to be replaced with... */ 363 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 364 365 /* Length of the PC-relative instruction containing plt_got_offset. 366 This is used for x86-64 only. */ 367 unsigned int plt_got_insn_size; 368 369 /* .eh_frame covering the non-lazy .plt section. */ 370 const bfd_byte *eh_frame_plt; 371 unsigned int eh_frame_plt_size; 372 }; 373 374 struct elf_x86_plt_layout 375 { 376 /* The first entry in a lazy procedure linkage table looks like this. */ 377 const bfd_byte *plt0_entry; 378 /* Entries in a procedure linkage table look like this. */ 379 const bfd_byte *plt_entry; 380 unsigned int plt_entry_size; /* Size of each PLT entry. */ 381 382 /* 1 has PLT0. */ 383 unsigned int has_plt0; 384 385 /* Offsets into plt_entry that are to be replaced with... */ 386 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 387 388 /* Length of the PC-relative instruction containing plt_got_offset. 389 This is only used for x86-64. */ 390 unsigned int plt_got_insn_size; 391 392 /* .eh_frame covering the .plt section. */ 393 const bfd_byte *eh_frame_plt; 394 unsigned int eh_frame_plt_size; 395 }; 396 397 /* Values in tls_type of x86 ELF linker hash entry. */ 398 #define GOT_UNKNOWN 0 399 #define GOT_NORMAL 1 400 #define GOT_TLS_GD 2 401 #define GOT_TLS_IE 4 402 #define GOT_TLS_IE_POS 5 403 #define GOT_TLS_IE_NEG 6 404 #define GOT_TLS_IE_BOTH 7 405 #define GOT_TLS_GDESC 8 406 #define GOT_TLS_GD_BOTH_P(type) \ 407 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) 408 #define GOT_TLS_GD_P(type) \ 409 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) 410 #define GOT_TLS_GDESC_P(type) \ 411 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) 412 #define GOT_TLS_GD_ANY_P(type) \ 413 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) 414 415 #define elf_x86_hash_entry(ent) \ 416 ((struct elf_x86_link_hash_entry *)(ent)) 417 418 enum elf_x86_target_os 419 { 420 is_normal, 421 is_solaris, 422 is_vxworks, 423 is_nacl 424 }; 425 426 /* x86 ELF linker hash table. */ 427 428 struct elf_x86_link_hash_table 429 { 430 struct elf_link_hash_table elf; 431 432 /* Short-cuts to get to dynamic linker sections. */ 433 asection *interp; 434 asection *plt_eh_frame; 435 asection *plt_second; 436 asection *plt_second_eh_frame; 437 asection *plt_got; 438 asection *plt_got_eh_frame; 439 440 /* Parameters describing PLT generation, lazy or non-lazy. */ 441 struct elf_x86_plt_layout plt; 442 443 /* Parameters describing lazy PLT generation. */ 444 const struct elf_x86_lazy_plt_layout *lazy_plt; 445 446 /* Parameters describing non-lazy PLT generation. */ 447 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 448 449 union 450 { 451 bfd_signed_vma refcount; 452 bfd_vma offset; 453 } tls_ld_or_ldm_got; 454 455 /* The amount of space used by the jump slots in the GOT. */ 456 bfd_vma sgotplt_jump_table_size; 457 458 /* Small local sym cache. */ 459 struct sym_cache sym_cache; 460 461 /* _TLS_MODULE_BASE_ symbol. */ 462 struct bfd_link_hash_entry *tls_module_base; 463 464 /* Used by local STT_GNU_IFUNC symbols. */ 465 htab_t loc_hash_table; 466 void * loc_hash_memory; 467 468 /* The offset into sgot of the GOT entry used by the PLT entry 469 above. */ 470 bfd_vma tlsdesc_got; 471 472 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */ 473 bfd_vma next_jump_slot_index; 474 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */ 475 bfd_vma next_irelative_index; 476 477 /* TRUE if there are dynamic relocs against IFUNC symbols that apply 478 to read-only sections. */ 479 bfd_boolean readonly_dynrelocs_against_ifunc; 480 481 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. 482 This is used for i386 only. */ 483 asection *srelplt2; 484 485 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This 486 is only used for i386. */ 487 bfd_vma next_tls_desc_index; 488 489 /* The offset into splt of the PLT entry for the TLS descriptor 490 resolver. Special values are 0, if not necessary (or not found 491 to be necessary yet), and -1 if needed but not determined 492 yet. This is only used for x86-64. */ 493 bfd_vma tlsdesc_plt; 494 495 /* Value used to fill the unused bytes of the first PLT entry. This 496 is only used for i386. */ 497 bfd_byte plt0_pad_byte; 498 499 /* TRUE if GOT is referenced. */ 500 unsigned int got_referenced : 1; 501 502 /* TRUE if PLT is PC-relative. PLT in PDE and PC-relative PLT in PIE 503 can be used as function address. 504 505 NB: i386 has non-PIC PLT and PIC PLT. Only non-PIC PLT in PDE can 506 be used as function address. PIC PLT in PIE can't be used as 507 function address. */ 508 unsigned int pcrel_plt : 1; 509 510 bfd_vma (*r_info) (bfd_vma, bfd_vma); 511 bfd_vma (*r_sym) (bfd_vma); 512 bfd_boolean (*is_reloc_section) (const char *); 513 enum elf_target_id target_id; 514 enum elf_x86_target_os target_os; 515 unsigned int sizeof_reloc; 516 unsigned int dt_reloc; 517 unsigned int dt_reloc_sz; 518 unsigned int dt_reloc_ent; 519 unsigned int got_entry_size; 520 unsigned int pointer_r_type; 521 int dynamic_interpreter_size; 522 const char *dynamic_interpreter; 523 const char *tls_get_addr; 524 }; 525 526 /* Architecture-specific backend data for x86. */ 527 528 struct elf_x86_backend_data 529 { 530 /* Target system. */ 531 enum elf_x86_target_os target_os; 532 }; 533 534 #define get_elf_x86_backend_data(abfd) \ 535 ((const struct elf_x86_backend_data *) \ 536 get_elf_backend_data (abfd)->arch_data) 537 538 struct elf_x86_init_table 539 { 540 /* The lazy PLT layout. */ 541 const struct elf_x86_lazy_plt_layout *lazy_plt; 542 543 /* The non-lazy PLT layout. */ 544 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 545 546 /* The lazy PLT layout for IBT. */ 547 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; 548 549 /* The non-lazy PLT layout for IBT. */ 550 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; 551 552 bfd_byte plt0_pad_byte; 553 554 bfd_vma (*r_info) (bfd_vma, bfd_vma); 555 bfd_vma (*r_sym) (bfd_vma); 556 }; 557 558 struct elf_x86_obj_tdata 559 { 560 struct elf_obj_tdata root; 561 562 /* tls_type for each local got entry. */ 563 char *local_got_tls_type; 564 565 /* GOTPLT entries for TLS descriptors. */ 566 bfd_vma *local_tlsdesc_gotent; 567 }; 568 569 enum elf_x86_plt_type 570 { 571 plt_non_lazy = 0, 572 plt_lazy = 1 << 0, 573 plt_pic = 1 << 1, 574 plt_second = 1 << 2, 575 plt_unknown = -1 576 }; 577 578 struct elf_x86_plt 579 { 580 const char *name; 581 asection *sec; 582 bfd_byte *contents; 583 enum elf_x86_plt_type type; 584 unsigned int plt_got_offset; 585 unsigned int plt_entry_size; 586 unsigned int plt_got_insn_size; /* Only used for x86-64. */ 587 long count; 588 }; 589 590 #define elf_x86_tdata(abfd) \ 591 ((struct elf_x86_obj_tdata *) (abfd)->tdata.any) 592 593 #define elf_x86_local_got_tls_type(abfd) \ 594 (elf_x86_tdata (abfd)->local_got_tls_type) 595 596 #define elf_x86_local_tlsdesc_gotent(abfd) \ 597 (elf_x86_tdata (abfd)->local_tlsdesc_gotent) 598 599 #define elf_x86_compute_jump_table_size(htab) \ 600 ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size) 601 602 #define is_x86_elf(bfd, htab) \ 603 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 604 && elf_tdata (bfd) != NULL \ 605 && elf_object_id (bfd) == (htab)->target_id) 606 607 extern bfd_boolean _bfd_x86_elf_mkobject 608 (bfd *); 609 610 extern void _bfd_x86_elf_set_tls_module_base 611 (struct bfd_link_info *); 612 613 extern bfd_vma _bfd_x86_elf_dtpoff_base 614 (struct bfd_link_info *); 615 616 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs 617 (struct elf_link_hash_entry *, void *); 618 619 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash 620 (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *, 621 bfd_boolean); 622 623 extern hashval_t _bfd_x86_elf_local_htab_hash 624 (const void *); 625 626 extern int _bfd_x86_elf_local_htab_eq 627 (const void *, const void *); 628 629 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc 630 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 631 632 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create 633 (bfd *); 634 635 extern int _bfd_x86_elf_compare_relocs 636 (const void *, const void *); 637 638 extern bfd_boolean _bfd_x86_elf_link_check_relocs 639 (bfd *, struct bfd_link_info *); 640 641 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections 642 (bfd *, struct bfd_link_info *); 643 644 extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections 645 (bfd *, struct bfd_link_info *); 646 647 extern bfd_boolean _bfd_x86_elf_always_size_sections 648 (bfd *, struct bfd_link_info *); 649 650 extern void _bfd_x86_elf_merge_symbol_attribute 651 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, 652 bfd_boolean, bfd_boolean); 653 654 extern void _bfd_x86_elf_copy_indirect_symbol 655 (struct bfd_link_info *, struct elf_link_hash_entry *, 656 struct elf_link_hash_entry *); 657 658 extern bfd_boolean _bfd_x86_elf_fixup_symbol 659 (struct bfd_link_info *, struct elf_link_hash_entry *); 660 661 extern bfd_boolean _bfd_x86_elf_hash_symbol 662 (struct elf_link_hash_entry *); 663 664 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol 665 (struct bfd_link_info *, struct elf_link_hash_entry *); 666 667 extern void _bfd_x86_elf_hide_symbol 668 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 669 670 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local 671 (struct bfd_link_info *, struct elf_link_hash_entry *); 672 673 extern asection * _bfd_x86_elf_gc_mark_hook 674 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 675 struct elf_link_hash_entry *, Elf_Internal_Sym *); 676 677 extern long _bfd_x86_elf_get_synthetic_symtab 678 (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **, 679 asymbol **); 680 681 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties 682 (bfd *, unsigned int, bfd_byte *, unsigned int); 683 684 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties 685 (struct bfd_link_info *, bfd *, elf_property *, elf_property *); 686 687 extern bfd * _bfd_x86_elf_link_setup_gnu_properties 688 (struct bfd_link_info *, struct elf_x86_init_table *); 689 690 extern void _bfd_x86_elf_link_fixup_ifunc_symbol 691 (struct bfd_link_info *, struct elf_x86_link_hash_table *, 692 struct elf_link_hash_entry *, Elf_Internal_Sym *sym); 693 694 #define bfd_elf64_mkobject \ 695 _bfd_x86_elf_mkobject 696 #define bfd_elf32_mkobject \ 697 _bfd_x86_elf_mkobject 698 #define bfd_elf64_bfd_link_hash_table_create \ 699 _bfd_x86_elf_link_hash_table_create 700 #define bfd_elf32_bfd_link_hash_table_create \ 701 _bfd_x86_elf_link_hash_table_create 702 #define bfd_elf64_bfd_link_check_relocs \ 703 _bfd_x86_elf_link_check_relocs 704 #define bfd_elf32_bfd_link_check_relocs \ 705 _bfd_x86_elf_link_check_relocs 706 707 #define elf_backend_size_dynamic_sections \ 708 _bfd_x86_elf_size_dynamic_sections 709 #define elf_backend_always_size_sections \ 710 _bfd_x86_elf_always_size_sections 711 #define elf_backend_merge_symbol_attribute \ 712 _bfd_x86_elf_merge_symbol_attribute 713 #define elf_backend_copy_indirect_symbol \ 714 _bfd_x86_elf_copy_indirect_symbol 715 #define elf_backend_fixup_symbol \ 716 _bfd_x86_elf_fixup_symbol 717 #define elf_backend_hash_symbol \ 718 _bfd_x86_elf_hash_symbol 719 #define elf_backend_adjust_dynamic_symbol \ 720 _bfd_x86_elf_adjust_dynamic_symbol 721 #define elf_backend_gc_mark_hook \ 722 _bfd_x86_elf_gc_mark_hook 723 #define elf_backend_omit_section_dynsym \ 724 _bfd_elf_omit_section_dynsym_all 725 #define elf_backend_parse_gnu_properties \ 726 _bfd_x86_elf_parse_gnu_properties 727 #define elf_backend_merge_gnu_properties \ 728 _bfd_x86_elf_merge_gnu_properties 729