1 /* x86 specific support for ELF 2 Copyright (C) 2017-2020 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 "hashtab.h" 27 #include "elf-linker-x86.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. Don't generate dynamic relocations against 123 non-preemptible absolute symbol. */ 124 #define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, SEC, \ 125 NEED_COPY_RELOC_IN_PIE, \ 126 RESOLVED_TO_ZERO, PC32_RELOC) \ 127 ((bfd_link_pic (INFO) \ 128 && !(bfd_is_abs_section (SEC) \ 129 && ((EH) == NULL \ 130 || SYMBOL_REFERENCES_LOCAL (INFO, &(EH)->elf))) \ 131 && !(NEED_COPY_RELOC_IN_PIE) \ 132 && ((EH) == NULL \ 133 || ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \ 134 && (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \ 135 || (EH)->elf.root.type != bfd_link_hash_undefweak)) \ 136 && ((!X86_PCREL_TYPE_P (R_TYPE) && !X86_SIZE_TYPE_P (R_TYPE)) \ 137 || ! SYMBOL_CALLS_LOCAL ((INFO), \ 138 (struct elf_link_hash_entry *) (EH)))) \ 139 || (ELIMINATE_COPY_RELOCS \ 140 && !bfd_link_pic (INFO) \ 141 && (EH) != NULL \ 142 && (EH)->elf.dynindx != -1 \ 143 && (!(EH)->elf.non_got_ref \ 144 || ((EH)->elf.root.type == bfd_link_hash_undefweak \ 145 && !(RESOLVED_TO_ZERO))) \ 146 && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \ 147 || (EH)->elf.root.type == bfd_link_hash_undefined))) 148 149 /* TRUE if this input relocation should be copied to output. H->dynindx 150 may be -1 if this symbol was marked to become local. */ 151 #define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \ 152 ((H) != NULL \ 153 && (H)->dynindx != -1 \ 154 && (X86_PCREL_TYPE_P (R_TYPE) \ 155 || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \ 156 || !(H)->def_regular)) 157 158 /* TRUE if this is actually a static link, or it is a -Bsymbolic link 159 and the symbol is defined locally, or the symbol was forced to be 160 local because of a version file. */ 161 #define RESOLVED_LOCALLY_P(INFO, H, HTAB) \ 162 (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \ 163 bfd_link_pic (INFO), (H)) \ 164 || (bfd_link_pic (INFO) \ 165 && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \ 166 || (ELF_ST_VISIBILITY ((H)->other) \ 167 && (H)->root.type == bfd_link_hash_undefweak)) 168 169 /* TRUE if this symbol isn't defined by a shared object. */ 170 #define SYMBOL_DEFINED_NON_SHARED_P(H) \ 171 ((H)->def_regular \ 172 || (H)->root.linker_def \ 173 || (H)->root.ldscript_def \ 174 || ((struct elf_x86_link_hash_entry *) (H))->linker_def \ 175 || ELF_COMMON_DEF_P (H)) 176 177 /* Return TRUE if the symbol described by a linker hash entry H is 178 going to be absolute. Similar to bfd_is_abs_symbol, but excluding 179 all linker-script defined symbols. */ 180 #define ABS_SYMBOL_P(H) \ 181 (bfd_is_abs_symbol (&(H)->root) && !(H)->root.ldscript_def) 182 183 /* TRUE if relative relocation should be generated. GOT reference to 184 global symbol in PIC will lead to dynamic symbol. It becomes a 185 problem when "time" or "times" is defined as a variable in an 186 executable, clashing with functions of the same name in libc. If a 187 symbol isn't undefined weak symbol, don't make it dynamic in PIC and 188 generate relative relocation. Don't generate relative relocation 189 against non-preemptible absolute symbol. */ 190 #define GENERATE_RELATIVE_RELOC_P(INFO, H) \ 191 ((H)->dynindx == -1 \ 192 && !(H)->forced_local \ 193 && (H)->root.type != bfd_link_hash_undefweak \ 194 && bfd_link_pic (INFO) \ 195 && !ABS_SYMBOL_P (H)) 196 197 /* TRUE if this is a pointer reference to a local IFUNC. */ 198 #define POINTER_LOCAL_IFUNC_P(INFO, H) \ 199 ((H)->dynindx == -1 \ 200 || (H)->forced_local \ 201 || bfd_link_executable (INFO)) 202 203 /* TRUE if this is a PLT reference to a local IFUNC. */ 204 #define PLT_LOCAL_IFUNC_P(INFO, H) \ 205 ((H)->dynindx == -1 \ 206 || ((bfd_link_executable (INFO) \ 207 || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \ 208 && (H)->def_regular \ 209 && (H)->type == STT_GNU_IFUNC)) 210 211 /* TRUE if TLS IE->LE transition is OK. */ 212 #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \ 213 (bfd_link_executable (INFO) \ 214 && (H) != NULL \ 215 && (H)->dynindx == -1 \ 216 && (TLS_TYPE & GOT_TLS_IE)) 217 218 /* Verify that the symbol has an entry in the procedure linkage table. */ 219 #define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \ 220 do \ 221 { \ 222 if (((H)->dynindx == -1 \ 223 && !LOCAL_UNDEFWEAK \ 224 && !(((H)->forced_local || bfd_link_executable (INFO)) \ 225 && (H)->def_regular \ 226 && (H)->type == STT_GNU_IFUNC)) \ 227 || (PLT) == NULL \ 228 || (GOTPLT) == NULL \ 229 || (RELPLT) == NULL) \ 230 abort (); \ 231 } \ 232 while (0); 233 234 /* Verify that the symbol supports copy relocation. */ 235 #define VERIFY_COPY_RELOC(H, HTAB) \ 236 do \ 237 { \ 238 if ((H)->dynindx == -1 \ 239 || ((H)->root.type != bfd_link_hash_defined \ 240 && (H)->root.type != bfd_link_hash_defweak) \ 241 || (HTAB)->elf.srelbss == NULL \ 242 || (HTAB)->elf.sreldynrelro == NULL) \ 243 abort (); \ 244 } \ 245 while (0); 246 247 /* x86 ELF linker hash entry. */ 248 249 struct elf_x86_link_hash_entry 250 { 251 struct elf_link_hash_entry elf; 252 253 unsigned char tls_type; 254 255 /* Bit 0: Symbol has no GOT nor PLT relocations. 256 Bit 1: Symbol has non-GOT/non-PLT relocations in text sections. 257 zero_undefweak is initialized to 1 and undefined weak symbol 258 should be resolved to 0 if zero_undefweak > 0. */ 259 unsigned int zero_undefweak : 2; 260 261 /* Don't call finish_dynamic_symbol on this symbol. */ 262 unsigned int no_finish_dynamic_symbol : 1; 263 264 /* TRUE if symbol is __tls_get_addr. */ 265 unsigned int tls_get_addr : 1; 266 267 /* TRUE if symbol is defined as a protected symbol. */ 268 unsigned int def_protected : 1; 269 270 /* 0: Symbol references are unknown. 271 1: Symbol references aren't local. 272 2: Symbol references are local. 273 */ 274 unsigned int local_ref : 2; 275 276 /* TRUE if symbol is defined by linker. */ 277 unsigned int linker_def : 1; 278 279 /* TRUE if symbol is referenced by R_386_GOTOFF relocation. This is 280 only used by i386. */ 281 unsigned int gotoff_ref : 1; 282 283 /* TRUE if a weak symbol with a real definition needs a copy reloc. 284 When there is a weak symbol with a real definition, the processor 285 independent code will have arranged for us to see the real 286 definition first. We need to copy the needs_copy bit from the 287 real definition and check it when allowing copy reloc in PIE. This 288 is only used by x86-64. */ 289 unsigned int needs_copy : 1; 290 291 /* Information about the GOT PLT entry. Filled when there are both 292 GOT and PLT relocations against the same function. */ 293 union gotplt_union plt_got; 294 295 /* Information about the second PLT entry. */ 296 union gotplt_union plt_second; 297 298 /* Offset of the GOTPLT entry reserved for the TLS descriptor, 299 starting at the end of the jump table. */ 300 bfd_vma tlsdesc_got; 301 }; 302 303 struct elf_x86_lazy_plt_layout 304 { 305 /* The first entry in a lazy procedure linkage table looks like this. */ 306 const bfd_byte *plt0_entry; 307 unsigned int plt0_entry_size; /* Size of PLT0 entry. */ 308 309 /* Later entries in a lazy procedure linkage table look like this. */ 310 const bfd_byte *plt_entry; 311 unsigned int plt_entry_size; /* Size of each PLT entry. */ 312 313 /* The TLSDESC entry in a lazy procedure linkage table looks like 314 this. This is for x86-64 only. */ 315 const bfd_byte *plt_tlsdesc_entry; 316 unsigned int plt_tlsdesc_entry_size; /* Size of TLSDESC entry. */ 317 318 /* Offsets into the TLSDESC entry that are to be replaced with 319 GOT+8 and GOT+TDG. These are for x86-64 only. */ 320 unsigned int plt_tlsdesc_got1_offset; 321 unsigned int plt_tlsdesc_got2_offset; 322 323 /* Offset of the end of the PC-relative instructions containing 324 plt_tlsdesc_got1_offset and plt_tlsdesc_got2_offset. These 325 are for x86-64 only. */ 326 unsigned int plt_tlsdesc_got1_insn_end; 327 unsigned int plt_tlsdesc_got2_insn_end; 328 329 /* Offsets into plt0_entry that are to be replaced with GOT[1] and 330 GOT[2]. */ 331 unsigned int plt0_got1_offset; 332 unsigned int plt0_got2_offset; 333 334 /* Offset of the end of the PC-relative instruction containing 335 plt0_got2_offset. This is for x86-64 only. */ 336 unsigned int plt0_got2_insn_end; 337 338 /* Offsets into plt_entry that are to be replaced with... */ 339 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 340 unsigned int plt_reloc_offset; /* ... offset into relocation table. */ 341 unsigned int plt_plt_offset; /* ... offset to start of .plt. */ 342 343 /* Length of the PC-relative instruction containing plt_got_offset. 344 This is used for x86-64 only. */ 345 unsigned int plt_got_insn_size; 346 347 /* Offset of the end of the PC-relative jump to plt0_entry. This is 348 used for x86-64 only. */ 349 unsigned int plt_plt_insn_end; 350 351 /* Offset into plt_entry where the initial value of the GOT entry 352 points. */ 353 unsigned int plt_lazy_offset; 354 355 /* The first entry in a PIC lazy procedure linkage table looks like 356 this. */ 357 const bfd_byte *pic_plt0_entry; 358 359 /* Subsequent entries in a PIC lazy procedure linkage table look 360 like this. */ 361 const bfd_byte *pic_plt_entry; 362 363 /* .eh_frame covering the lazy .plt section. */ 364 const bfd_byte *eh_frame_plt; 365 unsigned int eh_frame_plt_size; 366 }; 367 368 struct elf_x86_non_lazy_plt_layout 369 { 370 /* Entries in a non-lazy procedure linkage table look like this. */ 371 const bfd_byte *plt_entry; 372 /* Entries in a PIC non-lazy procedure linkage table look like this. 373 This is only used for i386 where absolute PLT and PIC PLT are 374 different. */ 375 const bfd_byte *pic_plt_entry; 376 377 unsigned int plt_entry_size; /* Size of each PLT entry. */ 378 379 /* Offsets into plt_entry that are to be replaced with... */ 380 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 381 382 /* Length of the PC-relative instruction containing plt_got_offset. 383 This is used for x86-64 only. */ 384 unsigned int plt_got_insn_size; 385 386 /* .eh_frame covering the non-lazy .plt section. */ 387 const bfd_byte *eh_frame_plt; 388 unsigned int eh_frame_plt_size; 389 }; 390 391 struct elf_x86_plt_layout 392 { 393 /* The first entry in a lazy procedure linkage table looks like this. */ 394 const bfd_byte *plt0_entry; 395 /* Entries in a procedure linkage table look like this. */ 396 const bfd_byte *plt_entry; 397 unsigned int plt_entry_size; /* Size of each PLT entry. */ 398 399 /* 1 has PLT0. */ 400 unsigned int has_plt0; 401 402 /* Offsets into plt_entry that are to be replaced with... */ 403 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 404 405 /* Length of the PC-relative instruction containing plt_got_offset. 406 This is only used for x86-64. */ 407 unsigned int plt_got_insn_size; 408 409 /* Alignment of the .iplt section. */ 410 unsigned int iplt_alignment; 411 412 /* .eh_frame covering the .plt section. */ 413 const bfd_byte *eh_frame_plt; 414 unsigned int eh_frame_plt_size; 415 }; 416 417 /* Values in tls_type of x86 ELF linker hash entry. */ 418 #define GOT_UNKNOWN 0 419 #define GOT_NORMAL 1 420 #define GOT_TLS_GD 2 421 #define GOT_TLS_IE 4 422 #define GOT_TLS_IE_POS 5 423 #define GOT_TLS_IE_NEG 6 424 #define GOT_TLS_IE_BOTH 7 425 #define GOT_TLS_GDESC 8 426 #define GOT_ABS 9 427 #define GOT_TLS_GD_BOTH_P(type) \ 428 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) 429 #define GOT_TLS_GD_P(type) \ 430 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) 431 #define GOT_TLS_GDESC_P(type) \ 432 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) 433 #define GOT_TLS_GD_ANY_P(type) \ 434 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) 435 436 #define elf_x86_hash_entry(ent) \ 437 ((struct elf_x86_link_hash_entry *)(ent)) 438 439 /* x86 ELF linker hash table. */ 440 441 struct elf_x86_link_hash_table 442 { 443 struct elf_link_hash_table elf; 444 445 /* Short-cuts to get to dynamic linker sections. */ 446 asection *interp; 447 asection *plt_eh_frame; 448 asection *plt_second; 449 asection *plt_second_eh_frame; 450 asection *plt_got; 451 asection *plt_got_eh_frame; 452 453 /* Parameters describing PLT generation, lazy or non-lazy. */ 454 struct elf_x86_plt_layout plt; 455 456 /* Parameters describing lazy PLT generation. */ 457 const struct elf_x86_lazy_plt_layout *lazy_plt; 458 459 /* Parameters describing non-lazy PLT generation. */ 460 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 461 462 union 463 { 464 bfd_signed_vma refcount; 465 bfd_vma offset; 466 } tls_ld_or_ldm_got; 467 468 /* The amount of space used by the jump slots in the GOT. */ 469 bfd_vma sgotplt_jump_table_size; 470 471 /* _TLS_MODULE_BASE_ symbol. */ 472 struct bfd_link_hash_entry *tls_module_base; 473 474 /* Used by local STT_GNU_IFUNC symbols. */ 475 htab_t loc_hash_table; 476 void * loc_hash_memory; 477 478 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */ 479 bfd_vma next_jump_slot_index; 480 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */ 481 bfd_vma next_irelative_index; 482 483 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. 484 This is used for i386 only. */ 485 asection *srelplt2; 486 487 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This 488 is only used for i386. */ 489 bfd_vma next_tls_desc_index; 490 491 /* Value used to fill the unused bytes of the first PLT entry. This 492 is only used for i386. */ 493 bfd_byte plt0_pad_byte; 494 495 /* TRUE if GOT is referenced. */ 496 unsigned int got_referenced : 1; 497 498 /* TRUE if PLT is PC-relative. PLT in PDE and PC-relative PLT in PIE 499 can be used as function address. 500 501 NB: i386 has non-PIC PLT and PIC PLT. Only non-PIC PLT in PDE can 502 be used as function address. PIC PLT in PIE can't be used as 503 function address. */ 504 unsigned int pcrel_plt : 1; 505 506 bfd_vma (*r_info) (bfd_vma, bfd_vma); 507 bfd_vma (*r_sym) (bfd_vma); 508 bfd_boolean (*is_reloc_section) (const char *); 509 unsigned int sizeof_reloc; 510 unsigned int got_entry_size; 511 unsigned int pointer_r_type; 512 int dynamic_interpreter_size; 513 const char *dynamic_interpreter; 514 const char *tls_get_addr; 515 516 /* Options passed from the linker. */ 517 struct elf_linker_x86_params *params; 518 }; 519 520 struct elf_x86_init_table 521 { 522 /* The lazy PLT layout. */ 523 const struct elf_x86_lazy_plt_layout *lazy_plt; 524 525 /* The non-lazy PLT layout. */ 526 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 527 528 /* The lazy PLT layout for IBT. */ 529 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; 530 531 /* The non-lazy PLT layout for IBT. */ 532 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; 533 534 bfd_byte plt0_pad_byte; 535 536 bfd_vma (*r_info) (bfd_vma, bfd_vma); 537 bfd_vma (*r_sym) (bfd_vma); 538 }; 539 540 struct elf_x86_obj_tdata 541 { 542 struct elf_obj_tdata root; 543 544 /* tls_type for each local got entry. */ 545 char *local_got_tls_type; 546 547 /* GOTPLT entries for TLS descriptors. */ 548 bfd_vma *local_tlsdesc_gotent; 549 }; 550 551 enum elf_x86_plt_type 552 { 553 plt_non_lazy = 0, 554 plt_lazy = 1 << 0, 555 plt_pic = 1 << 1, 556 plt_second = 1 << 2, 557 plt_unknown = -1 558 }; 559 560 struct elf_x86_plt 561 { 562 const char *name; 563 asection *sec; 564 bfd_byte *contents; 565 enum elf_x86_plt_type type; 566 unsigned int plt_got_offset; 567 unsigned int plt_entry_size; 568 unsigned int plt_got_insn_size; /* Only used for x86-64. */ 569 long count; 570 }; 571 572 /* Set if a relocation is converted from a GOTPCREL relocation. */ 573 #define R_X86_64_converted_reloc_bit (1 << 7) 574 575 #define elf_x86_tdata(abfd) \ 576 ((struct elf_x86_obj_tdata *) (abfd)->tdata.any) 577 578 #define elf_x86_local_got_tls_type(abfd) \ 579 (elf_x86_tdata (abfd)->local_got_tls_type) 580 581 #define elf_x86_local_tlsdesc_gotent(abfd) \ 582 (elf_x86_tdata (abfd)->local_tlsdesc_gotent) 583 584 #define elf_x86_compute_jump_table_size(htab) \ 585 ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size) 586 587 #define is_x86_elf(bfd, htab) \ 588 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 589 && elf_tdata (bfd) != NULL \ 590 && elf_object_id (bfd) == (htab)->elf.hash_table_id) 591 592 extern bfd_boolean _bfd_x86_elf_mkobject 593 (bfd *); 594 595 extern void _bfd_x86_elf_set_tls_module_base 596 (struct bfd_link_info *); 597 598 extern bfd_vma _bfd_x86_elf_dtpoff_base 599 (struct bfd_link_info *); 600 601 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs 602 (struct elf_link_hash_entry *, void *); 603 604 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash 605 (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *, 606 bfd_boolean); 607 608 extern hashval_t _bfd_x86_elf_local_htab_hash 609 (const void *); 610 611 extern int _bfd_x86_elf_local_htab_eq 612 (const void *, const void *); 613 614 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc 615 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 616 617 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create 618 (bfd *); 619 620 extern int _bfd_x86_elf_compare_relocs 621 (const void *, const void *); 622 623 extern bfd_boolean _bfd_x86_elf_link_check_relocs 624 (bfd *, struct bfd_link_info *); 625 626 extern bfd_boolean _bfd_elf_x86_valid_reloc_p 627 (asection *, struct bfd_link_info *, struct elf_x86_link_hash_table *, 628 const Elf_Internal_Rela *, struct elf_link_hash_entry *, 629 Elf_Internal_Sym *, Elf_Internal_Shdr *, bfd_boolean *); 630 631 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections 632 (bfd *, struct bfd_link_info *); 633 634 extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections 635 (bfd *, struct bfd_link_info *); 636 637 extern bfd_boolean _bfd_x86_elf_always_size_sections 638 (bfd *, struct bfd_link_info *); 639 640 extern void _bfd_x86_elf_merge_symbol_attribute 641 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, 642 bfd_boolean, bfd_boolean); 643 644 extern void _bfd_x86_elf_copy_indirect_symbol 645 (struct bfd_link_info *, struct elf_link_hash_entry *, 646 struct elf_link_hash_entry *); 647 648 extern bfd_boolean _bfd_x86_elf_fixup_symbol 649 (struct bfd_link_info *, struct elf_link_hash_entry *); 650 651 extern bfd_boolean _bfd_x86_elf_hash_symbol 652 (struct elf_link_hash_entry *); 653 654 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol 655 (struct bfd_link_info *, struct elf_link_hash_entry *); 656 657 extern void _bfd_x86_elf_hide_symbol 658 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 659 660 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local 661 (struct bfd_link_info *, struct elf_link_hash_entry *); 662 663 extern asection * _bfd_x86_elf_gc_mark_hook 664 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 665 struct elf_link_hash_entry *, Elf_Internal_Sym *); 666 667 extern long _bfd_x86_elf_get_synthetic_symtab 668 (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **, 669 asymbol **); 670 671 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties 672 (bfd *, unsigned int, bfd_byte *, unsigned int); 673 674 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties 675 (struct bfd_link_info *, bfd *, bfd *, elf_property *, elf_property *); 676 677 extern void _bfd_x86_elf_link_fixup_gnu_properties 678 (struct bfd_link_info *, elf_property_list **); 679 680 extern bfd * _bfd_x86_elf_link_setup_gnu_properties 681 (struct bfd_link_info *, struct elf_x86_init_table *); 682 683 extern void _bfd_x86_elf_link_fixup_ifunc_symbol 684 (struct bfd_link_info *, struct elf_x86_link_hash_table *, 685 struct elf_link_hash_entry *, Elf_Internal_Sym *sym); 686 687 #define bfd_elf64_mkobject \ 688 _bfd_x86_elf_mkobject 689 #define bfd_elf32_mkobject \ 690 _bfd_x86_elf_mkobject 691 #define bfd_elf64_bfd_link_hash_table_create \ 692 _bfd_x86_elf_link_hash_table_create 693 #define bfd_elf32_bfd_link_hash_table_create \ 694 _bfd_x86_elf_link_hash_table_create 695 #define bfd_elf64_bfd_link_check_relocs \ 696 _bfd_x86_elf_link_check_relocs 697 #define bfd_elf32_bfd_link_check_relocs \ 698 _bfd_x86_elf_link_check_relocs 699 700 #define elf_backend_size_dynamic_sections \ 701 _bfd_x86_elf_size_dynamic_sections 702 #define elf_backend_always_size_sections \ 703 _bfd_x86_elf_always_size_sections 704 #define elf_backend_merge_symbol_attribute \ 705 _bfd_x86_elf_merge_symbol_attribute 706 #define elf_backend_copy_indirect_symbol \ 707 _bfd_x86_elf_copy_indirect_symbol 708 #define elf_backend_fixup_symbol \ 709 _bfd_x86_elf_fixup_symbol 710 #define elf_backend_hash_symbol \ 711 _bfd_x86_elf_hash_symbol 712 #define elf_backend_adjust_dynamic_symbol \ 713 _bfd_x86_elf_adjust_dynamic_symbol 714 #define elf_backend_gc_mark_hook \ 715 _bfd_x86_elf_gc_mark_hook 716 #define elf_backend_omit_section_dynsym \ 717 _bfd_elf_omit_section_dynsym_all 718 #define elf_backend_parse_gnu_properties \ 719 _bfd_x86_elf_parse_gnu_properties 720 #define elf_backend_merge_gnu_properties \ 721 _bfd_x86_elf_merge_gnu_properties 722 #define elf_backend_fixup_gnu_properties \ 723 _bfd_x86_elf_link_fixup_gnu_properties 724