elf-bfd.h revision 1.6
1 /* BFD back-end data structures for ELF files. 2 Copyright (C) 1992-2016 Free Software Foundation, Inc. 3 Written by Cygnus Support. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #ifndef _LIBELF_H_ 23 #define _LIBELF_H_ 1 24 25 #include "elf/common.h" 26 #include "elf/external.h" 27 #include "elf/internal.h" 28 #include "bfdlink.h" 29 30 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 /* The number of entries in a section is its size divided by the size 35 of a single entry. This is normally only applicable to reloc and 36 symbol table sections. 37 PR 9934: It is possible to have relocations that do not refer to 38 symbols, thus it is also possible to have a relocation section in 39 an object file, but no symbol table. */ 40 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0) 41 42 /* If size isn't specified as 64 or 32, NAME macro should fail. */ 43 #ifndef NAME 44 #if ARCH_SIZE == 64 45 #define NAME(x, y) x ## 64 ## _ ## y 46 #endif 47 #if ARCH_SIZE == 32 48 #define NAME(x, y) x ## 32 ## _ ## y 49 #endif 50 #endif 51 52 #ifndef NAME 53 #define NAME(x, y) x ## NOSIZE ## _ ## y 54 #endif 55 56 #define ElfNAME(X) NAME(Elf,X) 57 #define elfNAME(X) NAME(elf,X) 58 59 /* Information held for an ELF symbol. The first field is the 60 corresponding asymbol. Every symbol is an ELF file is actually a 61 pointer to this structure, although it is often handled as a 62 pointer to an asymbol. */ 63 64 typedef struct 65 { 66 /* The BFD symbol. */ 67 asymbol symbol; 68 /* ELF symbol information. */ 69 Elf_Internal_Sym internal_elf_sym; 70 /* Backend specific information. */ 71 union 72 { 73 unsigned int hppa_arg_reloc; 74 void *mips_extr; 75 void *any; 76 } 77 tc_data; 78 79 /* Version information. This is from an Elf_Internal_Versym 80 structure in a SHT_GNU_versym section. It is zero if there is no 81 version information. */ 82 unsigned short version; 83 84 } elf_symbol_type; 85 86 struct elf_strtab_hash; 88 struct got_entry; 89 struct plt_entry; 90 91 union gotplt_union 92 { 93 bfd_signed_vma refcount; 94 bfd_vma offset; 95 struct got_entry *glist; 96 struct plt_entry *plist; 97 }; 98 99 struct elf_link_virtual_table_entry 100 { 101 /* Virtual table entry use information. This array is nominally of size 102 size/sizeof(target_void_pointer), though we have to be able to assume 103 and track a size while the symbol is still undefined. It is indexed 104 via offset/sizeof(target_void_pointer). */ 105 size_t size; 106 bfd_boolean *used; 107 108 /* Virtual table derivation info. */ 109 struct elf_link_hash_entry *parent; 110 }; 111 112 /* ELF symbol version. */ 113 enum elf_symbol_version 114 { 115 unknown = 0, 116 unversioned, 117 versioned, 118 versioned_hidden 119 }; 120 121 /* ELF linker hash table entries. */ 122 123 struct elf_link_hash_entry 124 { 125 struct bfd_link_hash_entry root; 126 127 /* Symbol index in output file. This is initialized to -1. It is 128 set to -2 if the symbol is used by a reloc. It is set to -3 if 129 this symbol is defined in a discarded section. */ 130 long indx; 131 132 /* Symbol index as a dynamic symbol. Initialized to -1, and remains 133 -1 if this is not a dynamic symbol. */ 134 /* ??? Note that this is consistently used as a synonym for tests 135 against whether we can perform various simplifying transformations 136 to the code. (E.g. changing a pc-relative jump to a PLT entry 137 into a pc-relative jump to the target function.) That test, which 138 is often relatively complex, and someplaces wrong or incomplete, 139 should really be replaced by a predicate in elflink.c. 140 141 End result: this field -1 does not indicate that the symbol is 142 not in the dynamic symbol table, but rather that the symbol is 143 not visible outside this DSO. */ 144 long dynindx; 145 146 /* If this symbol requires an entry in the global offset table, the 147 processor specific backend uses this field to track usage and 148 final offset. Two schemes are supported: The first assumes that 149 a symbol may only have one GOT entry, and uses REFCOUNT until 150 size_dynamic_sections, at which point the contents of the .got is 151 fixed. Afterward, if OFFSET is -1, then the symbol does not 152 require a global offset table entry. The second scheme allows 153 multiple GOT entries per symbol, managed via a linked list 154 pointed to by GLIST. */ 155 union gotplt_union got; 156 157 /* Same, but tracks a procedure linkage table entry. */ 158 union gotplt_union plt; 159 160 /* Symbol size. */ 161 bfd_size_type size; 162 163 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */ 164 unsigned int type : 8; 165 166 /* Symbol st_other value, symbol visibility. */ 167 unsigned int other : 8; 168 169 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */ 170 unsigned int target_internal : 8; 171 172 /* Symbol is referenced by a non-shared object (other than the object 173 in which it is defined). */ 174 unsigned int ref_regular : 1; 175 /* Symbol is defined by a non-shared object. */ 176 unsigned int def_regular : 1; 177 /* Symbol is referenced by a shared object. */ 178 unsigned int ref_dynamic : 1; 179 /* Symbol is defined by a shared object. */ 180 unsigned int def_dynamic : 1; 181 /* Symbol has a non-weak reference from a non-shared object (other than 182 the object in which it is defined). */ 183 unsigned int ref_regular_nonweak : 1; 184 /* Dynamic symbol has been adjustd. */ 185 unsigned int dynamic_adjusted : 1; 186 /* Symbol needs a copy reloc. */ 187 unsigned int needs_copy : 1; 188 /* Symbol needs a procedure linkage table entry. */ 189 unsigned int needs_plt : 1; 190 /* Symbol appears in a non-ELF input file. */ 191 unsigned int non_elf : 1; 192 /* Symbol version information. */ 193 ENUM_BITFIELD (elf_symbol_version) versioned : 2; 194 /* Symbol was forced to local scope due to a version script file. */ 195 unsigned int forced_local : 1; 196 /* Symbol was forced to be dynamic due to a version script file. */ 197 unsigned int dynamic : 1; 198 /* Symbol was marked during garbage collection. */ 199 unsigned int mark : 1; 200 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is 201 not currently set by all the backends. */ 202 unsigned int non_got_ref : 1; 203 /* Symbol has a definition in a shared object. 204 FIXME: There is no real need for this field if def_dynamic is never 205 cleared and all places that test def_dynamic also test def_regular. */ 206 unsigned int dynamic_def : 1; 207 /* Symbol has a non-weak reference from a shared object. */ 208 unsigned int ref_dynamic_nonweak : 1; 209 /* Symbol is referenced with a relocation where C/C++ pointer equality 210 matters. */ 211 unsigned int pointer_equality_needed : 1; 212 /* Symbol is a unique global symbol. */ 213 unsigned int unique_global : 1; 214 /* Symbol is defined by a shared library with non-default visibility 215 in a read/write section. */ 216 unsigned int protected_def : 1; 217 218 /* String table index in .dynstr if this is a dynamic symbol. */ 219 unsigned long dynstr_index; 220 221 union 222 { 223 /* If this is a weak defined symbol from a dynamic object, this 224 field points to a defined symbol with the same value, if there is 225 one. Otherwise it is NULL. */ 226 struct elf_link_hash_entry *weakdef; 227 228 /* Hash value of the name computed using the ELF hash function. 229 Used part way through size_dynamic_sections, after we've finished 230 with weakdefs. */ 231 unsigned long elf_hash_value; 232 } u; 233 234 /* Version information. */ 235 union 236 { 237 /* This field is used for a symbol which is not defined in a 238 regular object. It points to the version information read in 239 from the dynamic object. */ 240 Elf_Internal_Verdef *verdef; 241 /* This field is used for a symbol which is defined in a regular 242 object. It is set up in size_dynamic_sections. It points to 243 the version information we should write out for this symbol. */ 244 struct bfd_elf_version_tree *vertree; 245 } verinfo; 246 247 struct elf_link_virtual_table_entry *vtable; 248 }; 249 250 /* Will references to this symbol always reference the symbol 251 in this object? */ 252 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \ 253 _bfd_elf_symbol_refs_local_p (H, INFO, 0) 254 255 /* Will _calls_ to this symbol always call the version in this object? */ 256 #define SYMBOL_CALLS_LOCAL(INFO, H) \ 257 _bfd_elf_symbol_refs_local_p (H, INFO, 1) 258 259 /* Common symbols that are turned into definitions don't have the 260 DEF_REGULAR flag set, so they might appear to be undefined. 261 Symbols defined in linker scripts also don't have DEF_REGULAR set. */ 262 #define ELF_COMMON_DEF_P(H) \ 263 (!(H)->def_regular \ 264 && !(H)->def_dynamic \ 265 && (H)->root.type == bfd_link_hash_defined) 266 267 /* Records local symbols to be emitted in the dynamic symbol table. */ 268 269 struct elf_link_local_dynamic_entry 270 { 271 struct elf_link_local_dynamic_entry *next; 272 273 /* The input bfd this symbol came from. */ 274 bfd *input_bfd; 275 276 /* The index of the local symbol being copied. */ 277 long input_indx; 278 279 /* The index in the outgoing dynamic symbol table. */ 280 long dynindx; 281 282 /* A copy of the input symbol. */ 283 Elf_Internal_Sym isym; 284 }; 285 286 struct elf_link_loaded_list 287 { 288 struct elf_link_loaded_list *next; 289 bfd *abfd; 290 }; 291 292 /* Structures used by the eh_frame optimization code. */ 293 struct eh_cie_fde 294 { 295 union { 296 struct { 297 /* If REMOVED == 1, this is the CIE that the FDE originally used. 298 The CIE belongs to the same .eh_frame input section as the FDE. 299 300 If REMOVED == 0, this is the CIE that we have chosen to use for 301 the output FDE. The CIE's REMOVED field is also 0, but the CIE 302 might belong to a different .eh_frame input section from the FDE. 303 304 May be NULL to signify that the FDE should be discarded. */ 305 struct eh_cie_fde *cie_inf; 306 struct eh_cie_fde *next_for_section; 307 } fde; 308 struct { 309 /* CIEs have three states: 310 311 - REMOVED && !MERGED: Slated for removal because we haven't yet 312 proven that an FDE needs it. FULL_CIE, if nonnull, points to 313 more detailed information about the CIE. 314 315 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH, 316 which may not belong to the same input section. 317 318 - !REMOVED: We have decided to keep this CIE. SEC is the 319 .eh_frame input section that contains the CIE. */ 320 union { 321 struct cie *full_cie; 322 struct eh_cie_fde *merged_with; 323 asection *sec; 324 } u; 325 326 /* The offset of the personality data from the start of the CIE, 327 or 0 if the CIE doesn't have any. */ 328 unsigned int personality_offset : 8; 329 330 /* True if we have marked relocations associated with this CIE. */ 331 unsigned int gc_mark : 1; 332 333 /* True if we have decided to turn an absolute LSDA encoding into 334 a PC-relative one. */ 335 unsigned int make_lsda_relative : 1; 336 337 /* True if we have decided to turn an absolute personality 338 encoding into a PC-relative one. */ 339 unsigned int make_per_encoding_relative : 1; 340 341 /* True if the CIE contains personality data and if that 342 data uses a PC-relative encoding. Always true when 343 make_per_encoding_relative is. */ 344 unsigned int per_encoding_relative : 1; 345 346 /* True if we need to add an 'R' (FDE encoding) entry to the 347 CIE's augmentation data. */ 348 unsigned int add_fde_encoding : 1; 349 350 /* True if we have merged this CIE with another. */ 351 unsigned int merged : 1; 352 353 /* Unused bits. */ 354 unsigned int pad1 : 18; 355 } cie; 356 } u; 357 unsigned int reloc_index; 358 unsigned int size; 359 unsigned int offset; 360 unsigned int new_offset; 361 unsigned int fde_encoding : 8; 362 unsigned int lsda_encoding : 8; 363 unsigned int lsda_offset : 8; 364 365 /* True if this entry represents a CIE, false if it represents an FDE. */ 366 unsigned int cie : 1; 367 368 /* True if this entry is currently marked for removal. */ 369 unsigned int removed : 1; 370 371 /* True if we need to add a 'z' (augmentation size) entry to the CIE's 372 augmentation data, and an associated byte to each of the CIE's FDEs. */ 373 unsigned int add_augmentation_size : 1; 374 375 /* True if we have decided to convert absolute FDE relocations into 376 relative ones. This applies to the first relocation in the FDE, 377 which is against the code that the FDE describes. */ 378 unsigned int make_relative : 1; 379 380 /* Unused bits. */ 381 unsigned int pad1 : 4; 382 383 unsigned int *set_loc; 384 }; 385 386 struct eh_frame_sec_info 387 { 388 unsigned int count; 389 struct cie *cies; 390 struct eh_cie_fde entry[1]; 391 }; 392 393 struct eh_frame_array_ent 394 { 395 bfd_vma initial_loc; 396 bfd_size_type range; 397 bfd_vma fde; 398 }; 399 400 struct htab; 401 402 #define DWARF2_EH_HDR 1 403 #define COMPACT_EH_HDR 2 404 405 /* Endian-neutral code indicating that a function cannot be unwound. */ 406 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01 407 408 struct dwarf_eh_frame_hdr_info 409 { 410 struct htab *cies; 411 unsigned int fde_count; 412 /* TRUE if .eh_frame_hdr should contain the sorted search table. 413 We build it if we successfully read all .eh_frame input sections 414 and recognize them. */ 415 bfd_boolean table; 416 struct eh_frame_array_ent *array; 417 }; 418 419 struct compact_eh_frame_hdr_info 420 { 421 unsigned int allocated_entries; 422 /* eh_frame_entry fragments. */ 423 asection **entries; 424 }; 425 426 struct eh_frame_hdr_info 427 { 428 asection *hdr_sec; 429 unsigned int array_count; 430 bfd_boolean frame_hdr_is_compact; 431 union 432 { 433 struct dwarf_eh_frame_hdr_info dwarf; 434 struct compact_eh_frame_hdr_info compact; 435 } 436 u; 437 }; 438 439 /* Enum used to identify target specific extensions to the elf_obj_tdata 440 and elf_link_hash_table structures. Note the enums deliberately start 441 from 1 so that we can detect an uninitialized field. The generic value 442 is last so that additions to this enum do not need to modify more than 443 one line. */ 444 enum elf_target_id 445 { 446 AARCH64_ELF_DATA = 1, 447 ALPHA_ELF_DATA, 448 ARM_ELF_DATA, 449 AVR_ELF_DATA, 450 BFIN_ELF_DATA, 451 CRIS_ELF_DATA, 452 FRV_ELF_DATA, 453 HPPA32_ELF_DATA, 454 HPPA64_ELF_DATA, 455 I386_ELF_DATA, 456 IA64_ELF_DATA, 457 LM32_ELF_DATA, 458 M32R_ELF_DATA, 459 M68HC11_ELF_DATA, 460 M68K_ELF_DATA, 461 METAG_ELF_DATA, 462 MICROBLAZE_ELF_DATA, 463 MIPS_ELF_DATA, 464 MN10300_ELF_DATA, 465 NDS32_ELF_DATA, 466 NIOS2_ELF_DATA, 467 OR1K_ELF_DATA, 468 PPC32_ELF_DATA, 469 PPC64_ELF_DATA, 470 S390_ELF_DATA, 471 SH_ELF_DATA, 472 SPARC_ELF_DATA, 473 SPU_ELF_DATA, 474 TIC6X_ELF_DATA, 475 X86_64_ELF_DATA, 476 XTENSA_ELF_DATA, 477 XGATE_ELF_DATA, 478 TILEGX_ELF_DATA, 479 TILEPRO_ELF_DATA, 480 GENERIC_ELF_DATA 481 }; 482 483 struct elf_sym_strtab 484 { 485 Elf_Internal_Sym sym; 486 unsigned long dest_index; 487 unsigned long destshndx_index; 488 }; 489 490 /* ELF linker hash table. */ 491 492 struct elf_link_hash_table 493 { 494 struct bfd_link_hash_table root; 495 496 /* An identifier used to distinguish different target 497 specific extensions to this structure. */ 498 enum elf_target_id hash_table_id; 499 500 /* Whether we have created the special dynamic sections required 501 when linking against or generating a shared object. */ 502 bfd_boolean dynamic_sections_created; 503 504 /* True if this target has relocatable executables, so needs dynamic 505 section symbols. */ 506 bfd_boolean is_relocatable_executable; 507 508 /* The BFD used to hold special sections created by the linker. 509 This will be the first BFD found which requires these sections to 510 be created. */ 511 bfd *dynobj; 512 513 /* The value to use when initialising got.refcount/offset and 514 plt.refcount/offset in an elf_link_hash_entry. Set to zero when 515 the values are refcounts. Set to init_got_offset/init_plt_offset 516 in size_dynamic_sections when the values may be offsets. */ 517 union gotplt_union init_got_refcount; 518 union gotplt_union init_plt_refcount; 519 520 /* The value to use for got.refcount/offset and plt.refcount/offset 521 when the values may be offsets. Normally (bfd_vma) -1. */ 522 union gotplt_union init_got_offset; 523 union gotplt_union init_plt_offset; 524 525 /* The number of symbols found in the link which is intended for the 526 mandatory DT_SYMTAB tag (.dynsym section) in .dynamic section. */ 527 bfd_size_type dynsymcount; 528 529 /* The string table of dynamic symbols, which becomes the .dynstr 530 section. */ 531 struct elf_strtab_hash *dynstr; 532 533 /* The number of symbol strings found in the link which must be put 534 into the .strtab section. */ 535 bfd_size_type strtabcount; 536 537 /* The array size of the symbol string table, which becomes the 538 .strtab section. */ 539 bfd_size_type strtabsize; 540 541 /* The array of strings, which becomes the .strtab section. */ 542 struct elf_sym_strtab *strtab; 543 544 /* The number of buckets in the hash table in the .hash section. 545 This is based on the number of dynamic symbols. */ 546 bfd_size_type bucketcount; 547 548 /* A linked list of DT_NEEDED names found in dynamic objects 549 included in the link. */ 550 struct bfd_link_needed_list *needed; 551 552 /* Sections in the output bfd that provides a section symbol 553 to be used by relocations emitted against local symbols. 554 Most targets will not use data_index_section. */ 555 asection *text_index_section; 556 asection *data_index_section; 557 558 /* The _GLOBAL_OFFSET_TABLE_ symbol. */ 559 struct elf_link_hash_entry *hgot; 560 561 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */ 562 struct elf_link_hash_entry *hplt; 563 564 /* The _DYNAMIC symbol. */ 565 struct elf_link_hash_entry *hdynamic; 566 567 /* A pointer to information used to merge SEC_MERGE sections. */ 568 void *merge_info; 569 570 /* Used to link stabs in sections. */ 571 struct stab_info stab_info; 572 573 /* Used by eh_frame code when editing .eh_frame. */ 574 struct eh_frame_hdr_info eh_info; 575 576 /* A linked list of local symbols to be added to .dynsym. */ 577 struct elf_link_local_dynamic_entry *dynlocal; 578 579 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic 580 objects included in the link. */ 581 struct bfd_link_needed_list *runpath; 582 583 /* Cached first output tls section and size of PT_TLS segment. */ 584 asection *tls_sec; 585 bfd_size_type tls_size; 586 587 /* A linked list of BFD's loaded in the link. */ 588 struct elf_link_loaded_list *loaded; 589 590 /* Short-cuts to get to dynamic linker sections. */ 591 asection *sgot; 592 asection *sgotplt; 593 asection *srelgot; 594 asection *splt; 595 asection *srelplt; 596 asection *igotplt; 597 asection *iplt; 598 asection *irelplt; 599 asection *irelifunc; 600 asection *dynsym; 601 }; 602 603 /* Look up an entry in an ELF linker hash table. */ 604 605 #define elf_link_hash_lookup(table, string, create, copy, follow) \ 606 ((struct elf_link_hash_entry *) \ 607 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 608 (copy), (follow))) 609 610 /* Traverse an ELF linker hash table. */ 611 612 #define elf_link_hash_traverse(table, func, info) \ 613 (bfd_link_hash_traverse \ 614 (&(table)->root, \ 615 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 616 (info))) 617 618 /* Get the ELF linker hash table from a link_info structure. */ 619 620 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash)) 621 622 #define elf_hash_table_id(table) ((table) -> hash_table_id) 623 624 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */ 625 #define is_elf_hash_table(htab) \ 626 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table) 627 628 /* Used by bfd_sym_from_r_symndx to cache a small number of local 629 symbols. */ 630 #define LOCAL_SYM_CACHE_SIZE 32 631 struct sym_cache 632 { 633 bfd *abfd; 634 unsigned long indx[LOCAL_SYM_CACHE_SIZE]; 635 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE]; 636 }; 637 638 /* Constant information held for an ELF backend. */ 640 641 struct elf_size_info { 642 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr; 643 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note; 644 645 /* The size of entries in the .hash section. */ 646 unsigned char sizeof_hash_entry; 647 648 /* The number of internal relocations to allocate per external 649 relocation entry. */ 650 unsigned char int_rels_per_ext_rel; 651 /* We use some fixed size arrays. This should be large enough to 652 handle all back-ends. */ 653 #define MAX_INT_RELS_PER_EXT_REL 3 654 655 unsigned char arch_size, log_file_align; 656 unsigned char elfclass, ev_current; 657 int (*write_out_phdrs) 658 (bfd *, const Elf_Internal_Phdr *, unsigned int); 659 bfd_boolean 660 (*write_shdrs_and_ehdr) (bfd *); 661 bfd_boolean (*checksum_contents) 662 (bfd * , void (*) (const void *, size_t, void *), void *); 663 void (*write_relocs) 664 (bfd *, asection *, void *); 665 bfd_boolean (*swap_symbol_in) 666 (bfd *, const void *, const void *, Elf_Internal_Sym *); 667 void (*swap_symbol_out) 668 (bfd *, const Elf_Internal_Sym *, void *, void *); 669 bfd_boolean (*slurp_reloc_table) 670 (bfd *, asection *, asymbol **, bfd_boolean); 671 long (*slurp_symbol_table) 672 (bfd *, asymbol **, bfd_boolean); 673 void (*swap_dyn_in) 674 (bfd *, const void *, Elf_Internal_Dyn *); 675 void (*swap_dyn_out) 676 (bfd *, const Elf_Internal_Dyn *, void *); 677 678 /* This function is called to swap in a REL relocation. If an 679 external relocation corresponds to more than one internal 680 relocation, then all relocations are swapped in at once. */ 681 void (*swap_reloc_in) 682 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 683 684 /* This function is called to swap out a REL relocation. */ 685 void (*swap_reloc_out) 686 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 687 688 /* This function is called to swap in a RELA relocation. If an 689 external relocation corresponds to more than one internal 690 relocation, then all relocations are swapped in at once. */ 691 void (*swap_reloca_in) 692 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 693 694 /* This function is called to swap out a RELA relocation. */ 695 void (*swap_reloca_out) 696 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 697 }; 698 699 #define elf_symbol_from(ABFD,S) \ 700 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \ 701 && (S)->the_bfd->tdata.elf_obj_data != 0) \ 702 ? (elf_symbol_type *) (S) \ 703 : 0) 704 705 enum elf_reloc_type_class { 706 reloc_class_normal, 707 reloc_class_relative, 708 reloc_class_copy, 709 reloc_class_ifunc, 710 reloc_class_plt 711 }; 712 713 struct elf_reloc_cookie 714 { 715 Elf_Internal_Rela *rels, *rel, *relend; 716 Elf_Internal_Sym *locsyms; 717 bfd *abfd; 718 size_t locsymcount; 719 size_t extsymoff; 720 struct elf_link_hash_entry **sym_hashes; 721 int r_sym_shift; 722 bfd_boolean bad_symtab; 723 }; 724 725 /* The level of IRIX compatibility we're striving for. */ 726 727 typedef enum { 728 ict_none, 729 ict_irix5, 730 ict_irix6 731 } irix_compat_t; 732 733 /* Mapping of ELF section names and types. */ 734 struct bfd_elf_special_section 735 { 736 const char *prefix; 737 unsigned int prefix_length; 738 /* 0 means name must match PREFIX exactly. 739 -1 means name must start with PREFIX followed by an arbitrary string. 740 -2 means name must match PREFIX exactly or consist of PREFIX followed 741 by a dot then anything. 742 > 0 means name must start with the first PREFIX_LENGTH chars of 743 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */ 744 signed int suffix_length; 745 unsigned int type; 746 bfd_vma attr; 747 }; 748 749 enum action_discarded 750 { 751 COMPLAIN = 1, 752 PRETEND = 2 753 }; 754 755 typedef asection * (*elf_gc_mark_hook_fn) 756 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 757 struct elf_link_hash_entry *, Elf_Internal_Sym *); 758 759 struct elf_backend_data 760 { 761 /* The architecture for this backend. */ 762 enum bfd_architecture arch; 763 764 /* An identifier used to distinguish different target specific 765 extensions to elf_obj_tdata and elf_link_hash_table structures. */ 766 enum elf_target_id target_id; 767 768 /* The ELF machine code (EM_xxxx) for this backend. */ 769 int elf_machine_code; 770 771 /* EI_OSABI. */ 772 int elf_osabi; 773 774 /* The maximum page size for this backend. */ 775 bfd_vma maxpagesize; 776 777 /* The minimum page size for this backend. An input object will not be 778 considered page aligned unless its sections are correctly aligned for 779 pages at least this large. May be smaller than maxpagesize. */ 780 bfd_vma minpagesize; 781 782 /* The common page size for this backend. */ 783 bfd_vma commonpagesize; 784 785 /* The BFD flags applied to sections created for dynamic linking. */ 786 flagword dynamic_sec_flags; 787 788 /* Architecture-specific data for this backend. 789 This is actually a pointer to some type like struct elf_ARCH_data. */ 790 const void *arch_data; 791 792 /* A function to translate an ELF RELA relocation to a BFD arelent 793 structure. */ 794 void (*elf_info_to_howto) 795 (bfd *, arelent *, Elf_Internal_Rela *); 796 797 /* A function to translate an ELF REL relocation to a BFD arelent 798 structure. */ 799 void (*elf_info_to_howto_rel) 800 (bfd *, arelent *, Elf_Internal_Rela *); 801 802 /* A function to determine whether a symbol is global when 803 partitioning the symbol table into local and global symbols. 804 This should be NULL for most targets, in which case the correct 805 thing will be done. MIPS ELF, at least on the Irix 5, has 806 special requirements. */ 807 bfd_boolean (*elf_backend_sym_is_global) 808 (bfd *, asymbol *); 809 810 /* The remaining functions are hooks which are called only if they 811 are not NULL. */ 812 813 /* A function to permit a backend specific check on whether a 814 particular BFD format is relevant for an object file, and to 815 permit the backend to set any global information it wishes. When 816 this is called elf_elfheader is set, but anything else should be 817 used with caution. If this returns FALSE, the check_format 818 routine will return a bfd_error_wrong_format error. */ 819 bfd_boolean (*elf_backend_object_p) 820 (bfd *); 821 822 /* A function to do additional symbol processing when reading the 823 ELF symbol table. This is where any processor-specific special 824 section indices are handled. */ 825 void (*elf_backend_symbol_processing) 826 (bfd *, asymbol *); 827 828 /* A function to do additional symbol processing after reading the 829 entire ELF symbol table. */ 830 bfd_boolean (*elf_backend_symbol_table_processing) 831 (bfd *, elf_symbol_type *, unsigned int); 832 833 /* A function to set the type of the info field. Processor-specific 834 types should be handled here. */ 835 int (*elf_backend_get_symbol_type) 836 (Elf_Internal_Sym *, int); 837 838 /* A function to return the linker hash table entry of a symbol that 839 might be satisfied by an archive symbol. */ 840 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup) 841 (bfd *, struct bfd_link_info *, const char *); 842 843 /* Return true if local section symbols should have a non-null st_name. 844 NULL implies false. */ 845 bfd_boolean (*elf_backend_name_local_section_symbols) 846 (bfd *); 847 848 /* A function to do additional processing on the ELF section header 849 just before writing it out. This is used to set the flags and 850 type fields for some sections, or to actually write out data for 851 unusual sections. */ 852 bfd_boolean (*elf_backend_section_processing) 853 (bfd *, Elf_Internal_Shdr *); 854 855 /* A function to handle unusual section types when creating BFD 856 sections from ELF sections. */ 857 bfd_boolean (*elf_backend_section_from_shdr) 858 (bfd *, Elf_Internal_Shdr *, const char *, int); 859 860 /* A function to convert machine dependent ELF section header flags to 861 BFD internal section header flags. */ 862 bfd_boolean (*elf_backend_section_flags) 863 (flagword *, const Elf_Internal_Shdr *); 864 865 /* A function that returns a struct containing ELF section flags and 866 type for the given BFD section. */ 867 const struct bfd_elf_special_section * (*get_sec_type_attr) 868 (bfd *, asection *); 869 870 /* A function to handle unusual program segment types when creating BFD 871 sections from ELF program segments. */ 872 bfd_boolean (*elf_backend_section_from_phdr) 873 (bfd *, Elf_Internal_Phdr *, int, const char *); 874 875 /* A function to set up the ELF section header for a BFD section in 876 preparation for writing it out. This is where the flags and type 877 fields are set for unusual sections. */ 878 bfd_boolean (*elf_backend_fake_sections) 879 (bfd *, Elf_Internal_Shdr *, asection *); 880 881 /* A function to get the ELF section index for a BFD section. If 882 this returns TRUE, the section was found. If it is a normal ELF 883 section, *RETVAL should be left unchanged. If it is not a normal 884 ELF section *RETVAL should be set to the SHN_xxxx index. */ 885 bfd_boolean (*elf_backend_section_from_bfd_section) 886 (bfd *, asection *, int *retval); 887 888 /* If this field is not NULL, it is called by the add_symbols phase 889 of a link just before adding a symbol to the global linker hash 890 table. It may modify any of the fields as it wishes. If *NAME 891 is set to NULL, the symbol will be skipped rather than being 892 added to the hash table. This function is responsible for 893 handling all processor dependent symbol bindings and section 894 indices, and must set at least *FLAGS and *SEC for each processor 895 dependent case; failure to do so will cause a link error. */ 896 bfd_boolean (*elf_add_symbol_hook) 897 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *, 898 const char **name, flagword *flags, asection **sec, bfd_vma *value); 899 900 /* If this field is not NULL, it is called by the elf_link_output_sym 901 phase of a link for each symbol which will appear in the object file. 902 On error, this function returns 0. 1 is returned when the symbol 903 should be output, 2 is returned when the symbol should be discarded. */ 904 int (*elf_backend_link_output_symbol_hook) 905 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *, 906 asection *, struct elf_link_hash_entry *); 907 908 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend 909 linker the first time it encounters a dynamic object in the link. 910 This function must create any sections required for dynamic 911 linking. The ABFD argument is a dynamic object. The .interp, 912 .dynamic, .dynsym, .dynstr, and .hash functions have already been 913 created, and this function may modify the section flags if 914 desired. This function will normally create the .got and .plt 915 sections, but different backends have different requirements. */ 916 bfd_boolean (*elf_backend_create_dynamic_sections) 917 (bfd *abfd, struct bfd_link_info *info); 918 919 /* When creating a shared library, determine whether to omit the 920 dynamic symbol for the section. */ 921 bfd_boolean (*elf_backend_omit_section_dynsym) 922 (bfd *output_bfd, struct bfd_link_info *info, asection *osec); 923 924 /* Return TRUE if relocations of targets are compatible to the extent 925 that CHECK_RELOCS will properly process them. PR 4424. */ 926 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *); 927 928 /* The CHECK_RELOCS function is called by the add_symbols phase of 929 the ELF backend linker. It is called once for each section with 930 relocs of an object file, just after the symbols for the object 931 file have been added to the global linker hash table. The 932 function must look through the relocs and do any special handling 933 required. This generally means allocating space in the global 934 offset table, and perhaps allocating space for a reloc. The 935 relocs are always passed as Rela structures; if the section 936 actually uses Rel structures, the r_addend field will always be 937 zero. */ 938 bfd_boolean (*check_relocs) 939 (bfd *abfd, struct bfd_link_info *info, asection *o, 940 const Elf_Internal_Rela *relocs); 941 942 /* The CHECK_DIRECTIVES function is called once per input file by 943 the add_symbols phase of the ELF backend linker. The function 944 must inspect the bfd and create any additional symbols according 945 to any custom directives in the bfd. */ 946 bfd_boolean (*check_directives) 947 (bfd *abfd, struct bfd_link_info *info); 948 949 /* The NOTICE_AS_NEEDED function is called as the linker is about to 950 handle an as-needed lib (ACT = notice_as_needed), and after the 951 linker has decided to keep the lib (ACT = notice_needed) or when 952 the lib is not needed (ACT = notice_not_needed). */ 953 bfd_boolean (*notice_as_needed) 954 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act); 955 956 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend 957 linker for every symbol which is defined by a dynamic object and 958 referenced by a regular object. This is called after all the 959 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS 960 function has been called. The hash table entry should be 961 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be 962 defined in a section from a dynamic object. Dynamic object 963 sections are not included in the final link, and this function is 964 responsible for changing the value to something which the rest of 965 the link can deal with. This will normally involve adding an 966 entry to the .plt or .got or some such section, and setting the 967 symbol to point to that. */ 968 bfd_boolean (*elf_backend_adjust_dynamic_symbol) 969 (struct bfd_link_info *info, struct elf_link_hash_entry *h); 970 971 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker 972 after all the linker input files have been seen but before the 973 section sizes have been set. This is called after 974 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */ 975 bfd_boolean (*elf_backend_always_size_sections) 976 (bfd *output_bfd, struct bfd_link_info *info); 977 978 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend 979 linker after all the linker input files have been seen but before 980 the sections sizes have been set. This is called after 981 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols. 982 It is only called when linking against a dynamic object. It must 983 set the sizes of the dynamic sections, and may fill in their 984 contents as well. The generic ELF linker can handle the .dynsym, 985 .dynstr and .hash sections. This function must handle the 986 .interp section and any sections created by the 987 CREATE_DYNAMIC_SECTIONS entry point. */ 988 bfd_boolean (*elf_backend_size_dynamic_sections) 989 (bfd *output_bfd, struct bfd_link_info *info); 990 991 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections 992 we keep to use as a base for relocs and symbols. */ 993 void (*elf_backend_init_index_section) 994 (bfd *output_bfd, struct bfd_link_info *info); 995 996 /* The RELOCATE_SECTION function is called by the ELF backend linker 997 to handle the relocations for a section. 998 999 The relocs are always passed as Rela structures; if the section 1000 actually uses Rel structures, the r_addend field will always be 1001 zero. 1002 1003 This function is responsible for adjust the section contents as 1004 necessary, and (if using Rela relocs and generating a 1005 relocatable output file) adjusting the reloc addend as 1006 necessary. 1007 1008 This function does not have to worry about setting the reloc 1009 address or the reloc symbol index. 1010 1011 LOCAL_SYMS is a pointer to the swapped in local symbols. 1012 1013 LOCAL_SECTIONS is an array giving the section in the input file 1014 corresponding to the st_shndx field of each local symbol. 1015 1016 The global hash table entry for the global symbols can be found 1017 via elf_sym_hashes (input_bfd). 1018 1019 When generating relocatable output, this function must handle 1020 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 1021 going to be the section symbol corresponding to the output 1022 section, which means that the addend must be adjusted 1023 accordingly. 1024 1025 Returns FALSE on error, TRUE on success, 2 if successful and 1026 relocations should be written for this section. */ 1027 int (*elf_backend_relocate_section) 1028 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, 1029 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, 1030 Elf_Internal_Sym *local_syms, asection **local_sections); 1031 1032 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend 1033 linker just before it writes a symbol out to the .dynsym section. 1034 The processor backend may make any required adjustment to the 1035 symbol. It may also take the opportunity to set contents of the 1036 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on 1037 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called 1038 on those symbols which are defined by a dynamic object. */ 1039 bfd_boolean (*elf_backend_finish_dynamic_symbol) 1040 (bfd *output_bfd, struct bfd_link_info *info, 1041 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym); 1042 1043 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend 1044 linker just before it writes all the dynamic sections out to the 1045 output file. The FINISH_DYNAMIC_SYMBOL will have been called on 1046 all dynamic symbols. */ 1047 bfd_boolean (*elf_backend_finish_dynamic_sections) 1048 (bfd *output_bfd, struct bfd_link_info *info); 1049 1050 /* A function to do any beginning processing needed for the ELF file 1051 before building the ELF headers and computing file positions. */ 1052 void (*elf_backend_begin_write_processing) 1053 (bfd *, struct bfd_link_info *); 1054 1055 /* A function to do any final processing needed for the ELF file 1056 before writing it out. The LINKER argument is TRUE if this BFD 1057 was created by the ELF backend linker. */ 1058 void (*elf_backend_final_write_processing) 1059 (bfd *, bfd_boolean linker); 1060 1061 /* This function is called by get_program_header_size. It should 1062 return the number of additional program segments which this BFD 1063 will need. It should return -1 on error. */ 1064 int (*elf_backend_additional_program_headers) 1065 (bfd *, struct bfd_link_info *); 1066 1067 /* This function is called to modify an existing segment map in a 1068 backend specific fashion. */ 1069 bfd_boolean (*elf_backend_modify_segment_map) 1070 (bfd *, struct bfd_link_info *); 1071 1072 /* This function is called to modify program headers just before 1073 they are written. */ 1074 bfd_boolean (*elf_backend_modify_program_headers) 1075 (bfd *, struct bfd_link_info *); 1076 1077 /* This function is called before section garbage collection to 1078 mark entry symbol sections. */ 1079 void (*gc_keep) 1080 (struct bfd_link_info *); 1081 1082 /* This function is called during section garbage collection to 1083 mark sections that define global symbols. */ 1084 bfd_boolean (*gc_mark_dynamic_ref) 1085 (struct elf_link_hash_entry *, void *); 1086 1087 /* This function is called during section gc to discover the section a 1088 particular relocation refers to. */ 1089 elf_gc_mark_hook_fn gc_mark_hook; 1090 1091 /* This function, if defined, is called after the first gc marking pass 1092 to allow the backend to mark additional sections. */ 1093 bfd_boolean (*gc_mark_extra_sections) 1094 (struct bfd_link_info *, elf_gc_mark_hook_fn); 1095 1096 /* This function, if defined, is called during the sweep phase of gc 1097 in order that a backend might update any data structures it might 1098 be maintaining. */ 1099 bfd_boolean (*gc_sweep_hook) 1100 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); 1101 1102 /* This function, if defined, is called after the ELF headers have 1103 been created. This allows for things like the OS and ABI versions 1104 to be changed. */ 1105 void (*elf_backend_post_process_headers) 1106 (bfd *, struct bfd_link_info *); 1107 1108 /* This function, if defined, prints a symbol to file and returns the 1109 name of the symbol to be printed. It should return NULL to fall 1110 back to default symbol printing. */ 1111 const char *(*elf_backend_print_symbol_all) 1112 (bfd *, void *, asymbol *); 1113 1114 /* This function, if defined, is called after all local symbols and 1115 global symbols converted to locals are emitted into the symtab 1116 section. It allows the backend to emit special local symbols 1117 not handled in the hash table. */ 1118 bfd_boolean (*elf_backend_output_arch_local_syms) 1119 (bfd *, struct bfd_link_info *, void *, 1120 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1121 struct elf_link_hash_entry *)); 1122 1123 /* This function, if defined, is called after all symbols are emitted 1124 into the symtab section. It allows the backend to emit special 1125 global symbols not handled in the hash table. */ 1126 bfd_boolean (*elf_backend_output_arch_syms) 1127 (bfd *, struct bfd_link_info *, void *, 1128 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1129 struct elf_link_hash_entry *)); 1130 1131 /* Filter what symbols of the output file to include in the import 1132 library if one is created. */ 1133 unsigned int (*elf_backend_filter_implib_symbols) 1134 (bfd *, struct bfd_link_info *, asymbol **, long); 1135 1136 /* Copy any information related to dynamic linking from a pre-existing 1137 symbol to a newly created symbol. Also called to copy flags and 1138 other back-end info to a weakdef, in which case the symbol is not 1139 newly created and plt/got refcounts and dynamic indices should not 1140 be copied. */ 1141 void (*elf_backend_copy_indirect_symbol) 1142 (struct bfd_link_info *, struct elf_link_hash_entry *, 1143 struct elf_link_hash_entry *); 1144 1145 /* Modify any information related to dynamic linking such that the 1146 symbol is not exported. */ 1147 void (*elf_backend_hide_symbol) 1148 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1149 1150 /* A function to do additional symbol fixup, called by 1151 _bfd_elf_fix_symbol_flags. */ 1152 bfd_boolean (*elf_backend_fixup_symbol) 1153 (struct bfd_link_info *, struct elf_link_hash_entry *); 1154 1155 /* Merge the backend specific symbol attribute. */ 1156 void (*elf_backend_merge_symbol_attribute) 1157 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean, 1158 bfd_boolean); 1159 1160 /* This function, if defined, will return a string containing the 1161 name of a target-specific dynamic tag. */ 1162 char *(*elf_backend_get_target_dtag) 1163 (bfd_vma); 1164 1165 /* Decide whether an undefined symbol is special and can be ignored. 1166 This is the case for OPTIONAL symbols on IRIX. */ 1167 bfd_boolean (*elf_backend_ignore_undef_symbol) 1168 (struct elf_link_hash_entry *); 1169 1170 /* Emit relocations. Overrides default routine for emitting relocs, 1171 except during a relocatable link, or if all relocs are being emitted. */ 1172 bfd_boolean (*elf_backend_emit_relocs) 1173 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 1174 struct elf_link_hash_entry **); 1175 1176 /* Count relocations. Not called for relocatable links 1177 or if all relocs are being preserved in the output. */ 1178 unsigned int (*elf_backend_count_relocs) 1179 (struct bfd_link_info *, asection *); 1180 1181 /* Count additionals relocations. Called for relocatable links if 1182 additional relocations needs to be created. */ 1183 unsigned int (*elf_backend_count_additional_relocs) 1184 (asection *); 1185 1186 /* Say whether to sort relocs output by ld -r and ld --emit-relocs, 1187 by r_offset. If NULL, default to true. */ 1188 bfd_boolean (*sort_relocs_p) 1189 (asection *); 1190 1191 /* This function, if defined, is called when an NT_PRSTATUS note is found 1192 in a core file. */ 1193 bfd_boolean (*elf_backend_grok_prstatus) 1194 (bfd *, Elf_Internal_Note *); 1195 1196 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO 1197 note is found in a core file. */ 1198 bfd_boolean (*elf_backend_grok_psinfo) 1199 (bfd *, Elf_Internal_Note *); 1200 1201 /* This function, if defined, is called to write a note to a corefile. */ 1202 char *(*elf_backend_write_core_note) 1203 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...); 1204 1205 /* This function, if defined, is called to convert target-specific 1206 section flag names into hex values. */ 1207 flagword (*elf_backend_lookup_section_flags_hook) 1208 (char *); 1209 1210 /* This function returns class of a reloc type. */ 1211 enum elf_reloc_type_class (*elf_backend_reloc_type_class) 1212 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *); 1213 1214 /* This function, if defined, removes information about discarded functions 1215 from other sections which mention them. */ 1216 bfd_boolean (*elf_backend_discard_info) 1217 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *); 1218 1219 /* This function, if defined, signals that the function above has removed 1220 the discarded relocations for this section. */ 1221 bfd_boolean (*elf_backend_ignore_discarded_relocs) 1222 (asection *); 1223 1224 /* What to do when ld finds relocations against symbols defined in 1225 discarded sections. */ 1226 unsigned int (*action_discarded) 1227 (asection *); 1228 1229 /* This function returns the width of FDE pointers in bytes, or 0 if 1230 that can't be determined for some reason. The default definition 1231 goes by the bfd's EI_CLASS. */ 1232 unsigned int (*elf_backend_eh_frame_address_size) 1233 (bfd *, asection *); 1234 1235 /* These functions tell elf-eh-frame whether to attempt to turn 1236 absolute or lsda encodings into pc-relative ones. The default 1237 definition enables these transformations. */ 1238 bfd_boolean (*elf_backend_can_make_relative_eh_frame) 1239 (bfd *, struct bfd_link_info *, asection *); 1240 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame) 1241 (bfd *, struct bfd_link_info *, asection *); 1242 1243 /* This function returns an encoding after computing the encoded 1244 value (and storing it in ENCODED) for the given OFFSET into OSEC, 1245 to be stored in at LOC_OFFSET into the LOC_SEC input section. 1246 The default definition chooses a 32-bit PC-relative encoding. */ 1247 bfd_byte (*elf_backend_encode_eh_address) 1248 (bfd *abfd, struct bfd_link_info *info, 1249 asection *osec, bfd_vma offset, 1250 asection *loc_sec, bfd_vma loc_offset, 1251 bfd_vma *encoded); 1252 1253 /* This function, if defined, may write out the given section. 1254 Returns TRUE if it did so and FALSE if the caller should. */ 1255 bfd_boolean (*elf_backend_write_section) 1256 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1257 1258 /* The level of IRIX compatibility we're striving for. 1259 MIPS ELF specific function. */ 1260 irix_compat_t (*elf_backend_mips_irix_compat) 1261 (bfd *); 1262 1263 reloc_howto_type *(*elf_backend_mips_rtype_to_howto) 1264 (unsigned int, bfd_boolean); 1265 1266 /* The swapping table to use when dealing with ECOFF information. 1267 Used for the MIPS ELF .mdebug section. */ 1268 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap; 1269 1270 /* This function implements `bfd_elf_bfd_from_remote_memory'; 1271 see elf.c, elfcode.h. */ 1272 bfd *(*elf_backend_bfd_from_remote_memory) 1273 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 1274 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, 1275 bfd_size_type len)); 1276 1277 /* This function is used by `_bfd_elf_get_synthetic_symtab'; 1278 see elf.c. */ 1279 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *); 1280 1281 /* Is symbol defined in common section? */ 1282 bfd_boolean (*common_definition) (Elf_Internal_Sym *); 1283 1284 /* Return a common section index for section. */ 1285 unsigned int (*common_section_index) (asection *); 1286 1287 /* Return a common section for section. */ 1288 asection *(*common_section) (asection *); 1289 1290 /* Return TRUE if we can merge 2 definitions. */ 1291 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *, 1292 const Elf_Internal_Sym *, asection **, 1293 bfd_boolean, bfd_boolean, 1294 bfd *, const asection *); 1295 1296 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 1297 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *); 1298 1299 /* Return TRUE if type is a function symbol type. */ 1300 bfd_boolean (*is_function_type) (unsigned int type); 1301 1302 /* If the ELF symbol SYM might be a function in SEC, return the 1303 function size and set *CODE_OFF to the function's entry point, 1304 otherwise return zero. */ 1305 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec, 1306 bfd_vma *code_off); 1307 1308 /* Return the section which RELOC_SEC applies to. */ 1309 asection *(*get_reloc_section) (asection *reloc_sec); 1310 1311 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which 1312 has a type >= SHT_LOOS. Returns TRUE if the fields were initialised, 1313 FALSE otherwise. Can be called multiple times for a given section, 1314 until it returns TRUE. Most of the times it is called ISECTION will be 1315 set to an input section that might be associated with the output section. 1316 The last time that it is called, ISECTION will be set to NULL. */ 1317 bfd_boolean (*elf_backend_copy_special_section_fields) 1318 (const bfd *ibfd, bfd *obfd, const Elf_Internal_Shdr *isection, 1319 Elf_Internal_Shdr *osection); 1320 1321 /* Used to handle bad SHF_LINK_ORDER input. */ 1322 bfd_error_handler_type link_order_error_handler; 1323 1324 /* Name of the PLT relocation section. */ 1325 const char *relplt_name; 1326 1327 /* Alternate EM_xxxx machine codes for this backend. */ 1328 int elf_machine_alt1; 1329 int elf_machine_alt2; 1330 1331 const struct elf_size_info *s; 1332 1333 /* An array of target specific special sections. */ 1334 const struct bfd_elf_special_section *special_sections; 1335 1336 /* The size in bytes of the header for the GOT. This includes the 1337 so-called reserved entries on some systems. */ 1338 bfd_vma got_header_size; 1339 1340 /* The size of the GOT entry for the symbol pointed to by H if non-NULL, 1341 otherwise by the local symbol with index SYMNDX in IBFD. */ 1342 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *, 1343 struct elf_link_hash_entry *h, 1344 bfd *ibfd, unsigned long symndx); 1345 1346 /* The vendor name to use for a processor-standard attributes section. */ 1347 const char *obj_attrs_vendor; 1348 1349 /* The section name to use for a processor-standard attributes section. */ 1350 const char *obj_attrs_section; 1351 1352 /* Return 1, 2 or 3 to indicate what type of arguments a 1353 processor-specific tag takes. */ 1354 int (*obj_attrs_arg_type) (int); 1355 1356 /* The section type to use for an attributes section. */ 1357 unsigned int obj_attrs_section_type; 1358 1359 /* This function determines the order in which any attributes are 1360 written. It must be defined for input in the range 1361 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range 1362 is used in order to make unity easy). The returned value is the 1363 actual tag number to place in the input position. */ 1364 int (*obj_attrs_order) (int); 1365 1366 /* Handle merging unknown attributes; either warn and return TRUE, 1367 or give an error and return FALSE. */ 1368 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int); 1369 1370 /* Encoding used for compact EH tables. */ 1371 int (*compact_eh_encoding) (struct bfd_link_info *); 1372 1373 /* Opcode representing no unwind. */ 1374 int (*cant_unwind_opcode) (struct bfd_link_info *); 1375 1376 /* This is non-zero if static TLS segments require a special alignment. */ 1377 unsigned static_tls_alignment; 1378 1379 /* Alignment for the PT_GNU_STACK segment. */ 1380 unsigned stack_align; 1381 1382 /* Flag bits to assign to a section of type SHT_STRTAB. */ 1383 unsigned long elf_strtab_flags; 1384 1385 /* This is TRUE if the linker should act like collect and gather 1386 global constructors and destructors by name. This is TRUE for 1387 MIPS ELF because the Irix 5 tools can not handle the .init 1388 section. */ 1389 unsigned collect : 1; 1390 1391 /* This is TRUE if the linker should ignore changes to the type of a 1392 symbol. This is TRUE for MIPS ELF because some Irix 5 objects 1393 record undefined functions as STT_OBJECT although the definitions 1394 are STT_FUNC. */ 1395 unsigned type_change_ok : 1; 1396 1397 /* Whether the backend may use REL relocations. (Some backends use 1398 both REL and RELA relocations, and this flag is set for those 1399 backends.) */ 1400 unsigned may_use_rel_p : 1; 1401 1402 /* Whether the backend may use RELA relocations. (Some backends use 1403 both REL and RELA relocations, and this flag is set for those 1404 backends.) */ 1405 unsigned may_use_rela_p : 1; 1406 1407 /* Whether the default relocation type is RELA. If a backend with 1408 this flag set wants REL relocations for a particular section, 1409 it must note that explicitly. Similarly, if this flag is clear, 1410 and the backend wants RELA relocations for a particular 1411 section. */ 1412 unsigned default_use_rela_p : 1; 1413 1414 /* True if PLT and copy relocations should be RELA by default. */ 1415 unsigned rela_plts_and_copies_p : 1; 1416 1417 /* Set if RELA relocations for a relocatable link can be handled by 1418 generic code. Backends that set this flag need do nothing in the 1419 backend relocate_section routine for relocatable linking. */ 1420 unsigned rela_normal : 1; 1421 1422 /* TRUE if addresses "naturally" sign extend. This is used when 1423 swapping in from Elf32 when BFD64. */ 1424 unsigned sign_extend_vma : 1; 1425 1426 unsigned want_got_plt : 1; 1427 unsigned plt_readonly : 1; 1428 unsigned want_plt_sym : 1; 1429 unsigned plt_not_loaded : 1; 1430 unsigned plt_alignment : 4; 1431 unsigned can_gc_sections : 1; 1432 unsigned can_refcount : 1; 1433 unsigned want_got_sym : 1; 1434 unsigned want_dynbss : 1; 1435 1436 /* Targets which do not support physical addressing often require 1437 that the p_paddr field in the section header to be set to zero. 1438 This field indicates whether this behavior is required. */ 1439 unsigned want_p_paddr_set_to_zero : 1; 1440 1441 /* True if an object file lacking a .note.GNU-stack section 1442 should be assumed to be requesting exec stack. At least one 1443 other file in the link needs to have a .note.GNU-stack section 1444 for a PT_GNU_STACK segment to be created. */ 1445 unsigned default_execstack : 1; 1446 1447 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize 1448 in length rather than sec->size in length, if sec->rawsize is 1449 non-zero and smaller than sec->size. */ 1450 unsigned caches_rawsize : 1; 1451 1452 /* Address of protected data defined in the shared library may be 1453 external, i.e., due to copy relocation. */ 1454 unsigned extern_protected_data : 1; 1455 }; 1456 1457 /* Information about reloc sections associated with a bfd_elf_section_data 1458 structure. */ 1459 struct bfd_elf_section_reloc_data 1460 { 1461 /* The ELF header for the reloc section associated with this 1462 section, if any. */ 1463 Elf_Internal_Shdr *hdr; 1464 /* The number of relocations currently assigned to HDR. */ 1465 unsigned int count; 1466 /* The ELF section number of the reloc section. Only used for an 1467 output file. */ 1468 int idx; 1469 /* Used by the backend linker to store the symbol hash table entries 1470 associated with relocs against global symbols. */ 1471 struct elf_link_hash_entry **hashes; 1472 }; 1473 1474 /* Information stored for each BFD section in an ELF file. This 1475 structure is allocated by elf_new_section_hook. */ 1476 1477 struct bfd_elf_section_data 1478 { 1479 /* The ELF header for this section. */ 1480 Elf_Internal_Shdr this_hdr; 1481 1482 /* INPUT_SECTION_FLAGS if specified in the linker script. */ 1483 struct flag_info *section_flag_info; 1484 1485 /* Information about the REL and RELA reloc sections associated 1486 with this section, if any. */ 1487 struct bfd_elf_section_reloc_data rel, rela; 1488 1489 /* The ELF section number of this section. */ 1490 int this_idx; 1491 1492 /* Used by the backend linker when generating a shared library to 1493 record the dynamic symbol index for a section symbol 1494 corresponding to this section. A value of 0 means that there is 1495 no dynamic symbol for this section. */ 1496 int dynindx; 1497 1498 /* A pointer to the linked-to section for SHF_LINK_ORDER. */ 1499 asection *linked_to; 1500 1501 /* A pointer to the swapped relocs. If the section uses REL relocs, 1502 rather than RELA, all the r_addend fields will be zero. This 1503 pointer may be NULL. It is used by the backend linker. */ 1504 Elf_Internal_Rela *relocs; 1505 1506 /* A pointer to a linked list tracking dynamic relocs copied for 1507 local symbols. */ 1508 void *local_dynrel; 1509 1510 /* A pointer to the bfd section used for dynamic relocs. */ 1511 asection *sreloc; 1512 1513 union { 1514 /* Group name, if this section is a member of a group. */ 1515 const char *name; 1516 1517 /* Group signature sym, if this is the SHT_GROUP section. */ 1518 struct bfd_symbol *id; 1519 } group; 1520 1521 /* For a member of a group, points to the SHT_GROUP section. 1522 NULL for the SHT_GROUP section itself and non-group sections. */ 1523 asection *sec_group; 1524 1525 /* A linked list of member sections in the group. Circular when used by 1526 the linker. For the SHT_GROUP section, points at first member. */ 1527 asection *next_in_group; 1528 1529 /* The FDEs associated with this section. The u.fde.next_in_section 1530 field acts as a chain pointer. */ 1531 struct eh_cie_fde *fde_list; 1532 1533 /* Link from a text section to its .eh_frame_entry section. */ 1534 asection *eh_frame_entry; 1535 1536 /* A pointer used for various section optimizations. */ 1537 void *sec_info; 1538 }; 1539 1540 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd) 1541 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to) 1542 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type) 1543 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags) 1544 #define elf_group_name(sec) (elf_section_data(sec)->group.name) 1545 #define elf_group_id(sec) (elf_section_data(sec)->group.id) 1546 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group) 1547 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list) 1548 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group) 1549 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry) 1550 1551 #define xvec_get_elf_backend_data(xvec) \ 1552 ((const struct elf_backend_data *) (xvec)->backend_data) 1553 1554 #define get_elf_backend_data(abfd) \ 1555 xvec_get_elf_backend_data ((abfd)->xvec) 1556 1557 /* The least object attributes (within an attributes subsection) known 1558 for any target. Some code assumes that the value 0 is not used and 1559 the field for that attribute can instead be used as a marker to 1560 indicate that attributes have been initialized. */ 1561 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2 1562 1563 /* The maximum number of known object attributes for any target. */ 1564 #define NUM_KNOWN_OBJ_ATTRIBUTES 71 1565 1566 /* The value of an object attribute. The type indicates whether the attribute 1567 holds and integer, a string, or both. It can also indicate that there can 1568 be no default (i.e. all values must be written to file, even zero). */ 1569 1570 typedef struct obj_attribute 1571 { 1572 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0) 1573 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1) 1574 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2) 1575 1576 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL) 1577 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL) 1578 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT) 1579 1580 int type; 1581 unsigned int i; 1582 char *s; 1583 } obj_attribute; 1584 1585 typedef struct obj_attribute_list 1586 { 1587 struct obj_attribute_list *next; 1588 unsigned int tag; 1589 obj_attribute attr; 1590 } obj_attribute_list; 1591 1592 /* Object attributes may either be defined by the processor ABI, index 1593 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific 1594 (and possibly also processor-specific), index OBJ_ATTR_GNU. */ 1595 #define OBJ_ATTR_PROC 0 1596 #define OBJ_ATTR_GNU 1 1597 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC 1598 #define OBJ_ATTR_LAST OBJ_ATTR_GNU 1599 1600 /* The following object attribute tags are taken as generic, for all 1601 targets and for "gnu" where there is no target standard. */ 1602 enum 1603 { 1604 Tag_NULL = 0, 1605 Tag_File = 1, 1606 Tag_Section = 2, 1607 Tag_Symbol = 3, 1608 Tag_compatibility = 32 1609 }; 1610 1611 /* The following struct stores information about every SystemTap section 1612 found in the object file. */ 1613 struct sdt_note 1614 { 1615 struct sdt_note *next; 1616 bfd_size_type size; 1617 bfd_byte data[1]; 1618 }; 1619 1620 /* tdata information grabbed from an elf core file. */ 1621 struct core_elf_obj_tdata 1622 { 1623 int signal; 1624 int pid; 1625 int lwpid; 1626 char* program; 1627 char* command; 1628 }; 1629 1630 /* Extra tdata information held for output ELF BFDs. */ 1631 struct output_elf_obj_tdata 1632 { 1633 struct elf_segment_map *seg_map; 1634 struct elf_strtab_hash *strtab_ptr; 1635 1636 /* STT_SECTION symbols for each section */ 1637 asymbol **section_syms; 1638 1639 /* Used to determine if PT_GNU_EH_FRAME segment header should be 1640 created. */ 1641 asection *eh_frame_hdr; 1642 1643 /* NT_GNU_BUILD_ID note type info. */ 1644 struct 1645 { 1646 bfd_boolean (*after_write_object_contents) (bfd *); 1647 const char *style; 1648 asection *sec; 1649 } build_id; 1650 1651 /* Records the result of `get_program_header_size'. */ 1652 bfd_size_type program_header_size; 1653 1654 /* Used when laying out sections. */ 1655 file_ptr next_file_pos; 1656 1657 int num_section_syms; 1658 unsigned int shstrtab_section, strtab_section; 1659 1660 /* Segment flags for the PT_GNU_STACK segment. */ 1661 unsigned int stack_flags; 1662 1663 /* This is set to TRUE if the object was created by the backend 1664 linker. */ 1665 bfd_boolean linker; 1666 1667 /* Used to determine if the e_flags field has been initialized */ 1668 bfd_boolean flags_init; 1669 }; 1670 1671 /* Indicate if the bfd contains symbols that have the STT_GNU_IFUNC 1672 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi 1673 field in the ELF header structure. */ 1674 enum elf_gnu_symbols 1675 { 1676 elf_gnu_symbol_none = 0, 1677 elf_gnu_symbol_any = 1 << 0, 1678 elf_gnu_symbol_ifunc = (elf_gnu_symbol_any | 1 << 1), 1679 elf_gnu_symbol_unique = (elf_gnu_symbol_any | 1 << 2), 1680 elf_gnu_symbol_all = (elf_gnu_symbol_ifunc | elf_gnu_symbol_unique) 1681 }; 1682 1683 typedef struct elf_section_list 1684 { 1685 Elf_Internal_Shdr hdr; 1686 unsigned int ndx; 1687 struct elf_section_list * next; 1688 } elf_section_list; 1689 1690 1691 /* Some private data is stashed away for future use using the tdata pointer 1692 in the bfd structure. */ 1693 1694 struct elf_obj_tdata 1695 { 1696 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ 1697 Elf_Internal_Shdr **elf_sect_ptr; 1698 Elf_Internal_Phdr *phdr; 1699 Elf_Internal_Shdr symtab_hdr; 1700 Elf_Internal_Shdr shstrtab_hdr; 1701 Elf_Internal_Shdr strtab_hdr; 1702 Elf_Internal_Shdr dynsymtab_hdr; 1703 Elf_Internal_Shdr dynstrtab_hdr; 1704 Elf_Internal_Shdr dynversym_hdr; 1705 Elf_Internal_Shdr dynverref_hdr; 1706 Elf_Internal_Shdr dynverdef_hdr; 1707 elf_section_list * symtab_shndx_list; 1708 bfd_vma gp; /* The gp value */ 1709 unsigned int gp_size; /* The gp size */ 1710 unsigned int num_elf_sections; /* elf_sect_ptr size */ 1711 1712 /* A mapping from external symbols to entries in the linker hash 1713 table, used when linking. This is indexed by the symbol index 1714 minus the sh_info field of the symbol table header. */ 1715 struct elf_link_hash_entry **sym_hashes; 1716 1717 /* Track usage and final offsets of GOT entries for local symbols. 1718 This array is indexed by symbol index. Elements are used 1719 identically to "got" in struct elf_link_hash_entry. */ 1720 union 1721 { 1722 bfd_signed_vma *refcounts; 1723 bfd_vma *offsets; 1724 struct got_entry **ents; 1725 } local_got; 1726 1727 /* The linker ELF emulation code needs to let the backend ELF linker 1728 know what filename should be used for a dynamic object if the 1729 dynamic object is found using a search. The emulation code then 1730 sometimes needs to know what name was actually used. Until the 1731 file has been added to the linker symbol table, this field holds 1732 the name the linker wants. After it has been added, it holds the 1733 name actually used, which will be the DT_SONAME entry if there is 1734 one. */ 1735 const char *dt_name; 1736 1737 /* The linker emulation needs to know what audit libs 1738 are used by a dynamic object. */ 1739 const char *dt_audit; 1740 1741 /* Used by find_nearest_line entry point. */ 1742 void *line_info; 1743 1744 /* A place to stash dwarf1 info for this bfd. */ 1745 struct dwarf1_debug *dwarf1_find_line_info; 1746 1747 /* A place to stash dwarf2 info for this bfd. */ 1748 void *dwarf2_find_line_info; 1749 1750 /* Stash away info for yet another find line/function variant. */ 1751 void *elf_find_function_cache; 1752 1753 /* Number of symbol version definitions we are about to emit. */ 1754 unsigned int cverdefs; 1755 1756 /* Number of symbol version references we are about to emit. */ 1757 unsigned int cverrefs; 1758 1759 /* Symbol version definitions in external objects. */ 1760 Elf_Internal_Verdef *verdef; 1761 1762 /* Symbol version references to external objects. */ 1763 Elf_Internal_Verneed *verref; 1764 1765 /* A pointer to the .eh_frame section. */ 1766 asection *eh_frame_section; 1767 1768 /* Symbol buffer. */ 1769 void *symbuf; 1770 1771 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES]; 1772 obj_attribute_list *other_obj_attributes[2]; 1773 1774 /* Linked-list containing information about every Systemtap section 1775 found in the object file. Each section corresponds to one entry 1776 in the list. */ 1777 struct sdt_note *sdt_note_head; 1778 1779 Elf_Internal_Shdr **group_sect_ptr; 1780 int num_group; 1781 1782 unsigned int symtab_section, dynsymtab_section; 1783 unsigned int dynversym_section, dynverdef_section, dynverref_section; 1784 1785 /* An identifier used to distinguish different target 1786 specific extensions to this structure. */ 1787 enum elf_target_id object_id; 1788 1789 /* Whether a dyanmic object was specified normally on the linker 1790 command line, or was specified when --as-needed was in effect, 1791 or was found via a DT_NEEDED entry. */ 1792 enum dynamic_lib_link_class dyn_lib_class; 1793 1794 /* Irix 5 often screws up the symbol table, sorting local symbols 1795 after global symbols. This flag is set if the symbol table in 1796 this BFD appears to be screwed up. If it is, we ignore the 1797 sh_info field in the symbol table header, and always read all the 1798 symbols. */ 1799 bfd_boolean bad_symtab; 1800 1801 enum elf_gnu_symbols has_gnu_symbols; 1802 1803 /* Information grabbed from an elf core file. */ 1804 struct core_elf_obj_tdata *core; 1805 1806 /* More information held for output ELF BFDs. */ 1807 struct output_elf_obj_tdata *o; 1808 }; 1809 1810 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) 1811 1812 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id) 1813 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size) 1814 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) 1815 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) 1816 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections) 1817 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map) 1818 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos) 1819 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr) 1820 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker) 1821 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags) 1822 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr) 1823 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) 1824 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list) 1825 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section) 1826 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section) 1827 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr) 1828 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section) 1829 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section) 1830 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section) 1831 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section) 1832 #define elf_eh_frame_section(bfd) \ 1833 (elf_tdata(bfd) -> eh_frame_section) 1834 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms) 1835 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms) 1836 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) 1837 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) 1838 #define elf_gp(bfd) (elf_tdata(bfd) -> gp) 1839 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size) 1840 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes) 1841 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts) 1842 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets) 1843 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents) 1844 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name) 1845 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit) 1846 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class) 1847 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab) 1848 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init) 1849 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes) 1850 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes) 1851 #define elf_known_obj_attributes_proc(bfd) \ 1852 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1853 #define elf_other_obj_attributes_proc(bfd) \ 1854 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1855 1856 extern void _bfd_elf_swap_verdef_in 1858 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *); 1859 extern void _bfd_elf_swap_verdef_out 1860 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *); 1861 extern void _bfd_elf_swap_verdaux_in 1862 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *); 1863 extern void _bfd_elf_swap_verdaux_out 1864 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *); 1865 extern void _bfd_elf_swap_verneed_in 1866 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *); 1867 extern void _bfd_elf_swap_verneed_out 1868 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *); 1869 extern void _bfd_elf_swap_vernaux_in 1870 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *); 1871 extern void _bfd_elf_swap_vernaux_out 1872 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *); 1873 extern void _bfd_elf_swap_versym_in 1874 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *); 1875 extern void _bfd_elf_swap_versym_out 1876 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *); 1877 1878 extern unsigned int _bfd_elf_section_from_bfd_section 1879 (bfd *, asection *); 1880 extern char *bfd_elf_string_from_elf_section 1881 (bfd *, unsigned, unsigned); 1882 extern Elf_Internal_Sym *bfd_elf_get_elf_syms 1883 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *, 1884 Elf_External_Sym_Shndx *); 1885 extern const char *bfd_elf_sym_name 1886 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *); 1887 1888 extern bfd_boolean _bfd_elf_copy_private_bfd_data 1889 (bfd *, bfd *); 1890 extern bfd_boolean _bfd_elf_print_private_bfd_data 1891 (bfd *, void *); 1892 const char * _bfd_elf_get_symbol_version_string 1893 (bfd *, asymbol *, bfd_boolean *); 1894 extern void bfd_elf_print_symbol 1895 (bfd *, void *, asymbol *, bfd_print_symbol_type); 1896 1897 extern unsigned int _bfd_elf_eh_frame_address_size 1898 (bfd *, asection *); 1899 extern bfd_byte _bfd_elf_encode_eh_address 1900 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset, 1901 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded); 1902 extern bfd_boolean _bfd_elf_can_make_relative 1903 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section); 1904 1905 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class 1906 (const struct bfd_link_info *, const asection *, 1907 const Elf_Internal_Rela *); 1908 extern bfd_vma _bfd_elf_rela_local_sym 1909 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *); 1910 extern bfd_vma _bfd_elf_rel_local_sym 1911 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma); 1912 extern bfd_vma _bfd_elf_section_offset 1913 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1914 1915 extern unsigned long bfd_elf_hash 1916 (const char *); 1917 extern unsigned long bfd_elf_gnu_hash 1918 (const char *); 1919 1920 extern bfd_reloc_status_type bfd_elf_generic_reloc 1921 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 1922 extern bfd_boolean bfd_elf_allocate_object 1923 (bfd *, size_t, enum elf_target_id); 1924 extern bfd_boolean bfd_elf_make_object 1925 (bfd *); 1926 extern bfd_boolean bfd_elf_mkcorefile 1927 (bfd *); 1928 extern bfd_boolean _bfd_elf_make_section_from_shdr 1929 (bfd *, Elf_Internal_Shdr *, const char *, int); 1930 extern bfd_boolean _bfd_elf_make_section_from_phdr 1931 (bfd *, Elf_Internal_Phdr *, int, const char *); 1932 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc 1933 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 1934 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create 1935 (bfd *); 1936 extern void _bfd_elf_link_hash_table_free 1937 (bfd *); 1938 extern void _bfd_elf_link_hash_copy_indirect 1939 (struct bfd_link_info *, struct elf_link_hash_entry *, 1940 struct elf_link_hash_entry *); 1941 extern void _bfd_elf_link_hash_hide_symbol 1942 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1943 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol 1944 (struct bfd_link_info *, struct elf_link_hash_entry *); 1945 extern bfd_boolean _bfd_elf_link_hash_table_init 1946 (struct elf_link_hash_table *, bfd *, 1947 struct bfd_hash_entry *(*) 1948 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *), 1949 unsigned int, enum elf_target_id); 1950 extern bfd_boolean _bfd_elf_slurp_version_tables 1951 (bfd *, bfd_boolean); 1952 extern bfd_boolean _bfd_elf_merge_sections 1953 (bfd *, struct bfd_link_info *); 1954 extern bfd_boolean _bfd_elf_match_sections_by_type 1955 (bfd *, const asection *, bfd *, const asection *); 1956 extern bfd_boolean bfd_elf_is_group_section 1957 (bfd *, const struct bfd_section *); 1958 extern bfd_boolean _bfd_elf_section_already_linked 1959 (bfd *, asection *, struct bfd_link_info *); 1960 extern void bfd_elf_set_group_contents 1961 (bfd *, asection *, void *); 1962 extern unsigned int _bfd_elf_filter_global_symbols 1963 (bfd *, struct bfd_link_info *, asymbol **, long); 1964 extern asection *_bfd_elf_check_kept_section 1965 (asection *, struct bfd_link_info *); 1966 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms 1967 extern void _bfd_elf_copy_link_hash_symbol_type 1968 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *); 1969 extern bfd_boolean _bfd_elf_size_group_sections 1970 (struct bfd_link_info *); 1971 extern bfd_boolean _bfd_elf_fixup_group_sections 1972 (bfd *, asection *); 1973 extern bfd_boolean _bfd_elf_copy_private_header_data 1974 (bfd *, bfd *); 1975 extern bfd_boolean _bfd_elf_copy_private_symbol_data 1976 (bfd *, asymbol *, bfd *, asymbol *); 1977 #define _bfd_generic_init_private_section_data \ 1978 _bfd_elf_init_private_section_data 1979 extern bfd_boolean _bfd_elf_init_private_section_data 1980 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *); 1981 extern bfd_boolean _bfd_elf_copy_private_section_data 1982 (bfd *, asection *, bfd *, asection *); 1983 extern bfd_boolean _bfd_elf_write_object_contents 1984 (bfd *); 1985 extern bfd_boolean _bfd_elf_write_corefile_contents 1986 (bfd *); 1987 extern bfd_boolean _bfd_elf_set_section_contents 1988 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 1989 extern long _bfd_elf_get_symtab_upper_bound 1990 (bfd *); 1991 extern long _bfd_elf_canonicalize_symtab 1992 (bfd *, asymbol **); 1993 extern long _bfd_elf_get_dynamic_symtab_upper_bound 1994 (bfd *); 1995 extern long _bfd_elf_canonicalize_dynamic_symtab 1996 (bfd *, asymbol **); 1997 extern long _bfd_elf_get_synthetic_symtab 1998 (bfd *, long, asymbol **, long, asymbol **, asymbol **); 1999 extern long _bfd_elf_get_reloc_upper_bound 2000 (bfd *, sec_ptr); 2001 extern long _bfd_elf_canonicalize_reloc 2002 (bfd *, sec_ptr, arelent **, asymbol **); 2003 extern asection * _bfd_elf_get_dynamic_reloc_section 2004 (bfd *, asection *, bfd_boolean); 2005 extern asection * _bfd_elf_make_dynamic_reloc_section 2006 (asection *, bfd *, unsigned int, bfd *, bfd_boolean); 2007 extern long _bfd_elf_get_dynamic_reloc_upper_bound 2008 (bfd *); 2009 extern long _bfd_elf_canonicalize_dynamic_reloc 2010 (bfd *, arelent **, asymbol **); 2011 extern asymbol *_bfd_elf_make_empty_symbol 2012 (bfd *); 2013 extern void _bfd_elf_get_symbol_info 2014 (bfd *, asymbol *, symbol_info *); 2015 extern bfd_boolean _bfd_elf_is_local_label_name 2016 (bfd *, const char *); 2017 extern alent *_bfd_elf_get_lineno 2018 (bfd *, asymbol *); 2019 extern bfd_boolean _bfd_elf_set_arch_mach 2020 (bfd *, enum bfd_architecture, unsigned long); 2021 extern bfd_boolean _bfd_elf_find_nearest_line 2022 (bfd *, asymbol **, asection *, bfd_vma, 2023 const char **, const char **, unsigned int *, unsigned int *); 2024 extern bfd_boolean _bfd_elf_find_line 2025 (bfd *, asymbol **, asymbol *, const char **, unsigned int *); 2026 extern bfd_boolean _bfd_elf_find_inliner_info 2027 (bfd *, const char **, const char **, unsigned int *); 2028 extern asymbol *_bfd_elf_find_function 2029 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **); 2030 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols 2031 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 2032 extern int _bfd_elf_sizeof_headers 2033 (bfd *, struct bfd_link_info *); 2034 extern bfd_boolean _bfd_elf_new_section_hook 2035 (bfd *, asection *); 2036 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section 2037 (const char *, const struct bfd_elf_special_section *, unsigned int); 2038 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr 2039 (bfd *, asection *); 2040 2041 /* If the target doesn't have reloc handling written yet: */ 2042 extern void _bfd_elf_no_info_to_howto 2043 (bfd *, arelent *, Elf_Internal_Rela *); 2044 2045 extern bfd_boolean bfd_section_from_shdr 2046 (bfd *, unsigned int shindex); 2047 extern bfd_boolean bfd_section_from_phdr 2048 (bfd *, Elf_Internal_Phdr *, int); 2049 2050 extern int _bfd_elf_symbol_from_bfd_symbol 2051 (bfd *, asymbol **); 2052 2053 extern Elf_Internal_Sym *bfd_sym_from_r_symndx 2054 (struct sym_cache *, bfd *, unsigned long); 2055 extern asection *bfd_section_from_elf_index 2056 (bfd *, unsigned int); 2057 2058 extern struct elf_strtab_hash * _bfd_elf_strtab_init 2059 (void); 2060 extern void _bfd_elf_strtab_free 2061 (struct elf_strtab_hash *); 2062 extern size_t _bfd_elf_strtab_add 2063 (struct elf_strtab_hash *, const char *, bfd_boolean); 2064 extern void _bfd_elf_strtab_addref 2065 (struct elf_strtab_hash *, size_t); 2066 extern void _bfd_elf_strtab_delref 2067 (struct elf_strtab_hash *, size_t); 2068 extern unsigned int _bfd_elf_strtab_refcount 2069 (struct elf_strtab_hash *, size_t); 2070 extern void _bfd_elf_strtab_clear_all_refs 2071 (struct elf_strtab_hash *); 2072 extern void *_bfd_elf_strtab_save 2073 (struct elf_strtab_hash *); 2074 extern void _bfd_elf_strtab_restore 2075 (struct elf_strtab_hash *, void *); 2076 extern bfd_size_type _bfd_elf_strtab_size 2077 (struct elf_strtab_hash *); 2078 extern bfd_size_type _bfd_elf_strtab_offset 2079 (struct elf_strtab_hash *, size_t); 2080 extern bfd_boolean _bfd_elf_strtab_emit 2081 (bfd *, struct elf_strtab_hash *); 2082 extern void _bfd_elf_strtab_finalize 2083 (struct elf_strtab_hash *); 2084 2085 extern bfd_boolean bfd_elf_parse_eh_frame_entries 2086 (bfd *, struct bfd_link_info *); 2087 extern bfd_boolean _bfd_elf_parse_eh_frame_entry 2088 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 2089 extern void _bfd_elf_parse_eh_frame 2090 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 2091 extern bfd_boolean _bfd_elf_end_eh_frame_parsing 2092 (struct bfd_link_info *info); 2093 2094 extern bfd_boolean _bfd_elf_discard_section_eh_frame 2095 (bfd *, struct bfd_link_info *, asection *, 2096 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *); 2097 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr 2098 (bfd *, struct bfd_link_info *); 2099 extern bfd_vma _bfd_elf_eh_frame_section_offset 2100 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 2101 extern bfd_boolean _bfd_elf_write_section_eh_frame 2102 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 2103 bfd_boolean _bfd_elf_write_section_eh_frame_entry 2104 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 2105 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *); 2106 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr 2107 (bfd *, struct bfd_link_info *); 2108 extern bfd_boolean _bfd_elf_eh_frame_present 2109 (struct bfd_link_info *); 2110 extern bfd_boolean _bfd_elf_eh_frame_entry_present 2111 (struct bfd_link_info *); 2112 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr 2113 (struct bfd_link_info *); 2114 2115 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *); 2116 2117 extern long _bfd_elf_link_lookup_local_dynindx 2118 (struct bfd_link_info *, bfd *, long); 2119 extern bfd_boolean _bfd_elf_compute_section_file_positions 2120 (bfd *, struct bfd_link_info *); 2121 extern file_ptr _bfd_elf_assign_file_position_for_section 2122 (Elf_Internal_Shdr *, file_ptr, bfd_boolean); 2123 2124 extern bfd_boolean _bfd_elf_validate_reloc 2125 (bfd *, arelent *); 2126 2127 extern bfd_boolean _bfd_elf_link_create_dynamic_sections 2128 (bfd *, struct bfd_link_info *); 2129 extern bfd_boolean _bfd_elf_link_omit_section_dynsym 2130 (bfd *, struct bfd_link_info *, asection *); 2131 extern bfd_boolean _bfd_elf_create_dynamic_sections 2132 (bfd *, struct bfd_link_info *); 2133 extern bfd_boolean _bfd_elf_create_got_section 2134 (bfd *, struct bfd_link_info *); 2135 extern asection *_bfd_elf_section_for_symbol 2136 (struct elf_reloc_cookie *, unsigned long, bfd_boolean); 2137 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym 2138 (bfd *, struct bfd_link_info *, asection *, const char *); 2139 extern void _bfd_elf_init_1_index_section 2140 (bfd *, struct bfd_link_info *); 2141 extern void _bfd_elf_init_2_index_sections 2142 (bfd *, struct bfd_link_info *); 2143 2144 extern bfd_boolean _bfd_elfcore_make_pseudosection 2145 (bfd *, char *, size_t, ufile_ptr); 2146 extern char *_bfd_elfcore_strndup 2147 (bfd *, char *, size_t); 2148 2149 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs 2150 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean); 2151 2152 extern bfd_boolean _bfd_elf_link_output_relocs 2153 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 2154 struct elf_link_hash_entry **); 2155 2156 extern bfd_boolean _bfd_elf_adjust_dynamic_copy 2157 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *); 2158 2159 extern bfd_boolean _bfd_elf_dynamic_symbol_p 2160 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2161 2162 extern bfd_boolean _bfd_elf_symbol_refs_local_p 2163 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2164 2165 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation 2166 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma); 2167 2168 extern bfd_boolean _bfd_elf_setup_sections 2169 (bfd *); 2170 2171 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *); 2172 2173 extern const bfd_target *bfd_elf32_object_p 2174 (bfd *); 2175 extern const bfd_target *bfd_elf32_core_file_p 2176 (bfd *); 2177 extern char *bfd_elf32_core_file_failing_command 2178 (bfd *); 2179 extern int bfd_elf32_core_file_failing_signal 2180 (bfd *); 2181 extern bfd_boolean bfd_elf32_core_file_matches_executable_p 2182 (bfd *, bfd *); 2183 extern int bfd_elf32_core_file_pid 2184 (bfd *); 2185 2186 extern bfd_boolean bfd_elf32_swap_symbol_in 2187 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2188 extern void bfd_elf32_swap_symbol_out 2189 (bfd *, const Elf_Internal_Sym *, void *, void *); 2190 extern void bfd_elf32_swap_reloc_in 2191 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2192 extern void bfd_elf32_swap_reloc_out 2193 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2194 extern void bfd_elf32_swap_reloca_in 2195 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2196 extern void bfd_elf32_swap_reloca_out 2197 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2198 extern void bfd_elf32_swap_phdr_in 2199 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *); 2200 extern void bfd_elf32_swap_phdr_out 2201 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *); 2202 extern void bfd_elf32_swap_dyn_in 2203 (bfd *, const void *, Elf_Internal_Dyn *); 2204 extern void bfd_elf32_swap_dyn_out 2205 (bfd *, const Elf_Internal_Dyn *, void *); 2206 extern long bfd_elf32_slurp_symbol_table 2207 (bfd *, asymbol **, bfd_boolean); 2208 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr 2209 (bfd *); 2210 extern int bfd_elf32_write_out_phdrs 2211 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2212 extern bfd_boolean bfd_elf32_checksum_contents 2213 (bfd * , void (*) (const void *, size_t, void *), void *); 2214 extern void bfd_elf32_write_relocs 2215 (bfd *, asection *, void *); 2216 extern bfd_boolean bfd_elf32_slurp_reloc_table 2217 (bfd *, asection *, asymbol **, bfd_boolean); 2218 2219 extern const bfd_target *bfd_elf64_object_p 2220 (bfd *); 2221 extern const bfd_target *bfd_elf64_core_file_p 2222 (bfd *); 2223 extern char *bfd_elf64_core_file_failing_command 2224 (bfd *); 2225 extern int bfd_elf64_core_file_failing_signal 2226 (bfd *); 2227 extern bfd_boolean bfd_elf64_core_file_matches_executable_p 2228 (bfd *, bfd *); 2229 extern int bfd_elf64_core_file_pid 2230 (bfd *); 2231 2232 extern bfd_boolean bfd_elf64_swap_symbol_in 2233 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2234 extern void bfd_elf64_swap_symbol_out 2235 (bfd *, const Elf_Internal_Sym *, void *, void *); 2236 extern void bfd_elf64_swap_reloc_in 2237 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2238 extern void bfd_elf64_swap_reloc_out 2239 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2240 extern void bfd_elf64_swap_reloca_in 2241 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2242 extern void bfd_elf64_swap_reloca_out 2243 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2244 extern void bfd_elf64_swap_phdr_in 2245 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *); 2246 extern void bfd_elf64_swap_phdr_out 2247 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *); 2248 extern void bfd_elf64_swap_dyn_in 2249 (bfd *, const void *, Elf_Internal_Dyn *); 2250 extern void bfd_elf64_swap_dyn_out 2251 (bfd *, const Elf_Internal_Dyn *, void *); 2252 extern long bfd_elf64_slurp_symbol_table 2253 (bfd *, asymbol **, bfd_boolean); 2254 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr 2255 (bfd *); 2256 extern int bfd_elf64_write_out_phdrs 2257 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2258 extern bfd_boolean bfd_elf64_checksum_contents 2259 (bfd * , void (*) (const void *, size_t, void *), void *); 2260 extern void bfd_elf64_write_relocs 2261 (bfd *, asection *, void *); 2262 extern bfd_boolean bfd_elf64_slurp_reloc_table 2263 (bfd *, asection *, asymbol **, bfd_boolean); 2264 2265 extern bfd_boolean _bfd_elf_default_relocs_compatible 2266 (const bfd_target *, const bfd_target *); 2267 2268 extern bfd_boolean _bfd_elf_relocs_compatible 2269 (const bfd_target *, const bfd_target *); 2270 extern bfd_boolean _bfd_elf_notice_as_needed 2271 (bfd *, struct bfd_link_info *, enum notice_asneeded_action); 2272 2273 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup 2274 (bfd *, struct bfd_link_info *, const char *); 2275 extern bfd_boolean bfd_elf_link_add_symbols 2276 (bfd *, struct bfd_link_info *); 2277 extern bfd_boolean _bfd_elf_add_dynamic_entry 2278 (struct bfd_link_info *, bfd_vma, bfd_vma); 2279 extern bfd_boolean _bfd_elf_link_check_relocs 2280 (bfd *, struct bfd_link_info *); 2281 2282 extern bfd_boolean bfd_elf_link_record_dynamic_symbol 2283 (struct bfd_link_info *, struct elf_link_hash_entry *); 2284 2285 extern int bfd_elf_link_record_local_dynamic_symbol 2286 (struct bfd_link_info *, bfd *, long); 2287 2288 extern bfd_boolean _bfd_elf_close_and_cleanup 2289 (bfd *); 2290 2291 extern bfd_boolean _bfd_elf_common_definition 2292 (Elf_Internal_Sym *); 2293 2294 extern unsigned int _bfd_elf_common_section_index 2295 (asection *); 2296 2297 extern asection *_bfd_elf_common_section 2298 (asection *); 2299 2300 extern bfd_vma _bfd_elf_default_got_elt_size 2301 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *, 2302 unsigned long); 2303 2304 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn 2305 (bfd *, arelent *, struct bfd_symbol *, void *, 2306 asection *, bfd *, char **); 2307 2308 extern bfd_boolean bfd_elf_final_link 2309 (bfd *, struct bfd_link_info *); 2310 2311 extern void _bfd_elf_gc_keep 2312 (struct bfd_link_info *info); 2313 2314 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol 2315 (struct elf_link_hash_entry *h, void *inf); 2316 2317 extern bfd_boolean bfd_elf_gc_sections 2318 (bfd *, struct bfd_link_info *); 2319 2320 extern bfd_boolean bfd_elf_gc_record_vtinherit 2321 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2322 2323 extern bfd_boolean bfd_elf_gc_record_vtentry 2324 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2325 2326 extern asection *_bfd_elf_gc_mark_hook 2327 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 2328 struct elf_link_hash_entry *, Elf_Internal_Sym *); 2329 2330 extern asection *_bfd_elf_gc_mark_rsec 2331 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2332 struct elf_reloc_cookie *, bfd_boolean *); 2333 2334 extern bfd_boolean _bfd_elf_gc_mark_reloc 2335 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2336 struct elf_reloc_cookie *); 2337 2338 extern bfd_boolean _bfd_elf_gc_mark_fdes 2339 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn, 2340 struct elf_reloc_cookie *); 2341 2342 extern bfd_boolean _bfd_elf_gc_mark 2343 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn); 2344 2345 extern bfd_boolean _bfd_elf_gc_mark_extra_sections 2346 (struct bfd_link_info *, elf_gc_mark_hook_fn); 2347 2348 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets 2349 (bfd *, struct bfd_link_info *); 2350 2351 extern bfd_boolean bfd_elf_gc_common_final_link 2352 (bfd *, struct bfd_link_info *); 2353 2354 extern asection *_bfd_elf_is_start_stop 2355 (const struct bfd_link_info *, struct elf_link_hash_entry *); 2356 2357 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p 2358 (bfd_vma, void *); 2359 2360 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment 2361 (bfd *, asection *); 2362 2363 extern bfd_boolean _bfd_elf_map_sections_to_segments 2364 (bfd *, struct bfd_link_info *); 2365 2366 extern bfd_boolean _bfd_elf_is_function_type (unsigned int); 2367 2368 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *, 2369 bfd_vma *); 2370 2371 extern asection *_bfd_elf_get_reloc_section (asection *); 2372 2373 extern int bfd_elf_get_default_section_type (flagword); 2374 2375 extern bfd_boolean bfd_elf_lookup_section_flags 2376 (struct bfd_link_info *, struct flag_info *, asection *); 2377 2378 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section 2379 (bfd * abfd, asection * section); 2380 2381 /* PowerPC @tls opcode transform/validate. */ 2382 extern unsigned int _bfd_elf_ppc_at_tls_transform 2383 (unsigned int, unsigned int); 2384 /* PowerPC @tprel opcode transform/validate. */ 2385 extern unsigned int _bfd_elf_ppc_at_tprel_transform 2386 (unsigned int, unsigned int); 2387 /* PowerPC elf_object_p tweak. */ 2388 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *); 2389 2390 /* Exported interface for writing elf corefile notes. */ 2391 extern char *elfcore_write_note 2392 (bfd *, char *, int *, const char *, int, const void *, int); 2393 extern char *elfcore_write_prpsinfo 2394 (bfd *, char *, int *, const char *, const char *); 2395 extern char *elfcore_write_prstatus 2396 (bfd *, char *, int *, long, int, const void *); 2397 extern char * elfcore_write_pstatus 2398 (bfd *, char *, int *, long, int, const void *); 2399 extern char *elfcore_write_prfpreg 2400 (bfd *, char *, int *, const void *, int); 2401 extern char *elfcore_write_prxfpreg 2402 (bfd *, char *, int *, const void *, int); 2403 extern char *elfcore_write_xstatereg 2404 (bfd *, char *, int *, const void *, int); 2405 extern char *elfcore_write_ppc_vmx 2406 (bfd *, char *, int *, const void *, int); 2407 extern char *elfcore_write_ppc_vsx 2408 (bfd *, char *, int *, const void *, int); 2409 extern char *elfcore_write_s390_timer 2410 (bfd *, char *, int *, const void *, int); 2411 extern char *elfcore_write_s390_todcmp 2412 (bfd *, char *, int *, const void *, int); 2413 extern char *elfcore_write_s390_todpreg 2414 (bfd *, char *, int *, const void *, int); 2415 extern char *elfcore_write_s390_ctrs 2416 (bfd *, char *, int *, const void *, int); 2417 extern char *elfcore_write_s390_prefix 2418 (bfd *, char *, int *, const void *, int); 2419 extern char *elfcore_write_s390_last_break 2420 (bfd *, char *, int *, const void *, int); 2421 extern char *elfcore_write_s390_system_call 2422 (bfd *, char *, int *, const void *, int); 2423 extern char *elfcore_write_s390_tdb 2424 (bfd *, char *, int *, const void *, int); 2425 extern char *elfcore_write_s390_vxrs_low 2426 (bfd *, char *, int *, const void *, int); 2427 extern char *elfcore_write_s390_vxrs_high 2428 (bfd *, char *, int *, const void *, int); 2429 extern char *elfcore_write_arm_vfp 2430 (bfd *, char *, int *, const void *, int); 2431 extern char *elfcore_write_aarch_tls 2432 (bfd *, char *, int *, const void *, int); 2433 extern char *elfcore_write_aarch_hw_break 2434 (bfd *, char *, int *, const void *, int); 2435 extern char *elfcore_write_aarch_hw_watch 2436 (bfd *, char *, int *, const void *, int); 2437 extern char *elfcore_write_lwpstatus 2438 (bfd *, char *, int *, long, int, const void *); 2439 extern char *elfcore_write_register_note 2440 (bfd *, char *, int *, const char *, const void *, int); 2441 2442 /* Internal structure which holds information to be included in the 2443 PRPSINFO section of Linux core files. 2444 2445 This is an "internal" structure in the sense that it should be used 2446 to pass information to BFD (via the `elfcore_write_linux_prpsinfo' 2447 function), so things like endianess shouldn't be an issue. This 2448 structure will eventually be converted in one of the 2449 `elf_external_linux_*' structures and written out to an output bfd 2450 by one of the functions declared below. */ 2451 2452 struct elf_internal_linux_prpsinfo 2453 { 2454 char pr_state; /* Numeric process state. */ 2455 char pr_sname; /* Char for pr_state. */ 2456 char pr_zomb; /* Zombie. */ 2457 char pr_nice; /* Nice val. */ 2458 unsigned long pr_flag; /* Flags. */ 2459 unsigned int pr_uid; 2460 unsigned int pr_gid; 2461 int pr_pid, pr_ppid, pr_pgrp, pr_sid; 2462 char pr_fname[16 + 1]; /* Filename of executable. */ 2463 char pr_psargs[80 + 1]; /* Initial part of arg list. */ 2464 }; 2465 2466 /* Linux/most 32-bit archs. */ 2467 extern char *elfcore_write_linux_prpsinfo32 2468 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2469 2470 /* Linux/most 64-bit archs. */ 2471 extern char *elfcore_write_linux_prpsinfo64 2472 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2473 2474 /* Linux/PPC32 uses different layout compared to most archs. */ 2475 extern char *elfcore_write_ppc_linux_prpsinfo32 2476 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2477 2478 extern bfd *_bfd_elf32_bfd_from_remote_memory 2479 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2480 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2481 extern bfd *_bfd_elf64_bfd_from_remote_memory 2482 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2483 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2484 2485 extern bfd_vma bfd_elf_obj_attr_size (bfd *); 2486 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma); 2487 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int); 2488 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int); 2489 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \ 2490 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2491 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *); 2492 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \ 2493 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2494 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int, 2495 unsigned int, const char *); 2496 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \ 2497 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \ 2498 (INTVAL), (STRVAL)) 2499 2500 extern char *_bfd_elf_attr_strdup (bfd *, const char *); 2501 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *); 2502 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int); 2503 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *); 2504 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *); 2505 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int); 2506 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *); 2507 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec); 2508 2509 /* The linker may need to keep track of the number of relocs that it 2510 decides to copy as dynamic relocs in check_relocs for each symbol. 2511 This is so that it can later discard them if they are found to be 2512 unnecessary. We can store the information in a field extending the 2513 regular ELF linker hash table. */ 2514 2515 struct elf_dyn_relocs 2516 { 2517 struct elf_dyn_relocs *next; 2518 2519 /* The input section of the reloc. */ 2520 asection *sec; 2521 2522 /* Total number of relocs copied for the input section. */ 2523 bfd_size_type count; 2524 2525 /* Number of pc-relative relocs copied for the input section. */ 2526 bfd_size_type pc_count; 2527 }; 2528 2529 extern bfd_boolean _bfd_elf_create_ifunc_sections 2530 (bfd *, struct bfd_link_info *); 2531 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs 2532 (struct bfd_link_info *, struct elf_link_hash_entry *, 2533 struct elf_dyn_relocs **, bfd_boolean *, unsigned int, 2534 unsigned int, unsigned int, bfd_boolean); 2535 extern long _bfd_elf_ifunc_get_synthetic_symtab 2536 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *, 2537 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *)); 2538 2539 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *); 2540 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *); 2541 2542 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma); 2543 extern bfd_vma elf64_r_sym (bfd_vma); 2544 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma); 2545 extern bfd_vma elf32_r_sym (bfd_vma); 2546 2547 /* Large common section. */ 2548 extern asection _bfd_elf_large_com_section; 2549 2550 /* Hash for local symbol with the first section id, ID, in the input 2551 file and the local symbol index, SYM. */ 2552 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \ 2553 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \ 2554 ^ (SYM) ^ ((ID) >> 16)) 2555 2556 /* This is the condition under which finish_dynamic_symbol will be called. 2557 If our finish_dynamic_symbol isn't called, we'll need to do something 2558 about initializing any .plt and .got entries in relocate_section. */ 2559 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ 2560 ((DYN) \ 2561 && ((SHARED) || !(H)->forced_local) \ 2562 && ((H)->dynindx != -1 || (H)->forced_local)) 2563 2564 /* This macro is to avoid lots of duplicated code in the body 2565 of xxx_relocate_section() in the various elfxx-xxxx.c files. */ 2566 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \ 2567 r_symndx, symtab_hdr, sym_hashes, \ 2568 h, sec, relocation, \ 2569 unresolved_reloc, warned, ignored) \ 2570 do \ 2571 { \ 2572 /* It seems this can happen with erroneous or unsupported \ 2573 input (mixing a.out and elf in an archive, for example.) */ \ 2574 if (sym_hashes == NULL) \ 2575 return FALSE; \ 2576 \ 2577 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \ 2578 \ 2579 if (info->wrap_hash != NULL \ 2580 && (input_section->flags & SEC_DEBUGGING) != 0) \ 2581 h = ((struct elf_link_hash_entry *) \ 2582 unwrap_hash_lookup (info, input_bfd, &h->root)); \ 2583 \ 2584 while (h->root.type == bfd_link_hash_indirect \ 2585 || h->root.type == bfd_link_hash_warning) \ 2586 h = (struct elf_link_hash_entry *) h->root.u.i.link; \ 2587 \ 2588 warned = FALSE; \ 2589 ignored = FALSE; \ 2590 unresolved_reloc = FALSE; \ 2591 relocation = 0; \ 2592 if (h->root.type == bfd_link_hash_defined \ 2593 || h->root.type == bfd_link_hash_defweak) \ 2594 { \ 2595 sec = h->root.u.def.section; \ 2596 if (sec == NULL \ 2597 || sec->output_section == NULL) \ 2598 /* Set a flag that will be cleared later if we find a \ 2599 relocation value for this symbol. output_section \ 2600 is typically NULL for symbols satisfied by a shared \ 2601 library. */ \ 2602 unresolved_reloc = TRUE; \ 2603 else \ 2604 relocation = (h->root.u.def.value \ 2605 + sec->output_section->vma \ 2606 + sec->output_offset); \ 2607 } \ 2608 else if (h->root.type == bfd_link_hash_undefweak) \ 2609 ; \ 2610 else if (info->unresolved_syms_in_objects == RM_IGNORE \ 2611 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \ 2612 ignored = TRUE; \ 2613 else if (!bfd_link_relocatable (info)) \ 2614 { \ 2615 bfd_boolean err; \ 2616 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \ 2617 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \ 2618 (*info->callbacks->undefined_symbol) (info, \ 2619 h->root.root.string, \ 2620 input_bfd, \ 2621 input_section, \ 2622 rel->r_offset, err); \ 2623 warned = TRUE; \ 2624 } \ 2625 (void) unresolved_reloc; \ 2626 (void) warned; \ 2627 (void) ignored; \ 2628 } \ 2629 while (0) 2630 2631 /* This macro is to avoid lots of duplicated code in the body of the 2632 loop over relocations in xxx_relocate_section() in the various 2633 elfxx-xxxx.c files. 2634 2635 Handle relocations against symbols from removed linkonce sections, 2636 or sections discarded by a linker script. When doing a relocatable 2637 link, we remove such relocations. Otherwise, we just want the 2638 section contents zeroed and avoid any special processing. */ 2639 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \ 2640 rel, count, relend, \ 2641 howto, index, contents) \ 2642 { \ 2643 int i_; \ 2644 _bfd_clear_contents (howto, input_bfd, input_section, \ 2645 contents + rel[index].r_offset); \ 2646 \ 2647 if (bfd_link_relocatable (info) \ 2648 && (input_section->flags & SEC_DEBUGGING)) \ 2649 { \ 2650 /* Only remove relocations in debug sections since other \ 2651 sections may require relocations. */ \ 2652 Elf_Internal_Shdr *rel_hdr; \ 2653 \ 2654 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \ 2655 \ 2656 /* Avoid empty output section. */ \ 2657 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \ 2658 { \ 2659 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2660 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \ 2661 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2662 \ 2663 memmove (rel, rel + count, \ 2664 (relend - rel - count) * sizeof (*rel)); \ 2665 \ 2666 input_section->reloc_count--; \ 2667 relend -= count; \ 2668 rel--; \ 2669 continue; \ 2670 } \ 2671 } \ 2672 \ 2673 for (i_ = 0; i_ < count; i_++) \ 2674 { \ 2675 rel[i_].r_info = 0; \ 2676 rel[i_].r_addend = 0; \ 2677 } \ 2678 rel += count - 1; \ 2679 continue; \ 2680 } 2681 2682 /* Will a symbol be bound to the definition within the shared 2683 library, if any. A unique symbol can never be bound locally. */ 2684 #define SYMBOLIC_BIND(INFO, H) \ 2685 (!(H)->unique_global \ 2686 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))) 2687 2688 #ifdef __cplusplus 2689 } 2690 #endif 2691 #endif /* _LIBELF_H_ */ 2692
Indexes created Tue Apr 21 00:23:25 UTC 2026