1 /* BFD back-end data structures for ELF files. 2 Copyright (C) 1992-2014 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 /* The number of entries in a section is its size divided by the size 31 of a single entry. This is normally only applicable to reloc and 32 symbol table sections. 33 PR 9934: It is possible to have relocations that do not refer to 34 symbols, thus it is also possible to have a relocation section in 35 an object file, but no symbol table. */ 36 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0) 37 38 /* If size isn't specified as 64 or 32, NAME macro should fail. */ 39 #ifndef NAME 40 #if ARCH_SIZE == 64 41 #define NAME(x, y) x ## 64 ## _ ## y 42 #endif 43 #if ARCH_SIZE == 32 44 #define NAME(x, y) x ## 32 ## _ ## y 45 #endif 46 #endif 47 48 #ifndef NAME 49 #define NAME(x, y) x ## NOSIZE ## _ ## y 50 #endif 51 52 #define ElfNAME(X) NAME(Elf,X) 53 #define elfNAME(X) NAME(elf,X) 54 55 /* Information held for an ELF symbol. The first field is the 56 corresponding asymbol. Every symbol is an ELF file is actually a 57 pointer to this structure, although it is often handled as a 58 pointer to an asymbol. */ 59 60 typedef struct 61 { 62 /* The BFD symbol. */ 63 asymbol symbol; 64 /* ELF symbol information. */ 65 Elf_Internal_Sym internal_elf_sym; 66 /* Backend specific information. */ 67 union 68 { 69 unsigned int hppa_arg_reloc; 70 void *mips_extr; 71 void *any; 72 } 73 tc_data; 74 75 /* Version information. This is from an Elf_Internal_Versym 76 structure in a SHT_GNU_versym section. It is zero if there is no 77 version information. */ 78 unsigned short version; 79 80 } elf_symbol_type; 81 82 struct elf_strtab_hash; 84 struct got_entry; 85 struct plt_entry; 86 87 union gotplt_union 88 { 89 bfd_signed_vma refcount; 90 bfd_vma offset; 91 struct got_entry *glist; 92 struct plt_entry *plist; 93 }; 94 95 struct elf_link_virtual_table_entry 96 { 97 /* Virtual table entry use information. This array is nominally of size 98 size/sizeof(target_void_pointer), though we have to be able to assume 99 and track a size while the symbol is still undefined. It is indexed 100 via offset/sizeof(target_void_pointer). */ 101 size_t size; 102 bfd_boolean *used; 103 104 /* Virtual table derivation info. */ 105 struct elf_link_hash_entry *parent; 106 }; 107 108 /* ELF linker hash table entries. */ 109 110 struct elf_link_hash_entry 111 { 112 struct bfd_link_hash_entry root; 113 114 /* Symbol index in output file. This is initialized to -1. It is 115 set to -2 if the symbol is used by a reloc. */ 116 long indx; 117 118 /* Symbol index as a dynamic symbol. Initialized to -1, and remains 119 -1 if this is not a dynamic symbol. */ 120 /* ??? Note that this is consistently used as a synonym for tests 121 against whether we can perform various simplifying transformations 122 to the code. (E.g. changing a pc-relative jump to a PLT entry 123 into a pc-relative jump to the target function.) That test, which 124 is often relatively complex, and someplaces wrong or incomplete, 125 should really be replaced by a predicate in elflink.c. 126 127 End result: this field -1 does not indicate that the symbol is 128 not in the dynamic symbol table, but rather that the symbol is 129 not visible outside this DSO. */ 130 long dynindx; 131 132 /* If this symbol requires an entry in the global offset table, the 133 processor specific backend uses this field to track usage and 134 final offset. Two schemes are supported: The first assumes that 135 a symbol may only have one GOT entry, and uses REFCOUNT until 136 size_dynamic_sections, at which point the contents of the .got is 137 fixed. Afterward, if OFFSET is -1, then the symbol does not 138 require a global offset table entry. The second scheme allows 139 multiple GOT entries per symbol, managed via a linked list 140 pointed to by GLIST. */ 141 union gotplt_union got; 142 143 /* Same, but tracks a procedure linkage table entry. */ 144 union gotplt_union plt; 145 146 /* Symbol size. */ 147 bfd_size_type size; 148 149 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */ 150 unsigned int type : 8; 151 152 /* Symbol st_other value, symbol visibility. */ 153 unsigned int other : 8; 154 155 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */ 156 unsigned int target_internal : 8; 157 158 /* Symbol is referenced by a non-shared object (other than the object 159 in which it is defined). */ 160 unsigned int ref_regular : 1; 161 /* Symbol is defined by a non-shared object. */ 162 unsigned int def_regular : 1; 163 /* Symbol is referenced by a shared object. */ 164 unsigned int ref_dynamic : 1; 165 /* Symbol is defined by a shared object. */ 166 unsigned int def_dynamic : 1; 167 /* Symbol has a non-weak reference from a non-shared object (other than 168 the object in which it is defined). */ 169 unsigned int ref_regular_nonweak : 1; 170 /* Dynamic symbol has been adjustd. */ 171 unsigned int dynamic_adjusted : 1; 172 /* Symbol needs a copy reloc. */ 173 unsigned int needs_copy : 1; 174 /* Symbol needs a procedure linkage table entry. */ 175 unsigned int needs_plt : 1; 176 /* Symbol appears in a non-ELF input file. */ 177 unsigned int non_elf : 1; 178 /* Symbol should be marked as hidden in the version information. */ 179 unsigned int hidden : 1; 180 /* Symbol was forced to local scope due to a version script file. */ 181 unsigned int forced_local : 1; 182 /* Symbol was forced to be dynamic due to a version script file. */ 183 unsigned int dynamic : 1; 184 /* Symbol was marked during garbage collection. */ 185 unsigned int mark : 1; 186 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is 187 not currently set by all the backends. */ 188 unsigned int non_got_ref : 1; 189 /* Symbol has a definition in a shared object. 190 FIXME: There is no real need for this field if def_dynamic is never 191 cleared and all places that test def_dynamic also test def_regular. */ 192 unsigned int dynamic_def : 1; 193 /* Symbol has a non-weak reference from a shared object. */ 194 unsigned int ref_dynamic_nonweak : 1; 195 /* Symbol is referenced with a relocation where C/C++ pointer equality 196 matters. */ 197 unsigned int pointer_equality_needed : 1; 198 /* Symbol is a unique global symbol. */ 199 unsigned int unique_global : 1; 200 201 /* String table index in .dynstr if this is a dynamic symbol. */ 202 unsigned long dynstr_index; 203 204 union 205 { 206 /* If this is a weak defined symbol from a dynamic object, this 207 field points to a defined symbol with the same value, if there is 208 one. Otherwise it is NULL. */ 209 struct elf_link_hash_entry *weakdef; 210 211 /* Hash value of the name computed using the ELF hash function. 212 Used part way through size_dynamic_sections, after we've finished 213 with weakdefs. */ 214 unsigned long elf_hash_value; 215 } u; 216 217 /* Version information. */ 218 union 219 { 220 /* This field is used for a symbol which is not defined in a 221 regular object. It points to the version information read in 222 from the dynamic object. */ 223 Elf_Internal_Verdef *verdef; 224 /* This field is used for a symbol which is defined in a regular 225 object. It is set up in size_dynamic_sections. It points to 226 the version information we should write out for this symbol. */ 227 struct bfd_elf_version_tree *vertree; 228 } verinfo; 229 230 struct elf_link_virtual_table_entry *vtable; 231 }; 232 233 /* Will references to this symbol always reference the symbol 234 in this object? */ 235 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \ 236 _bfd_elf_symbol_refs_local_p (H, INFO, 0) 237 238 /* Will _calls_ to this symbol always call the version in this object? */ 239 #define SYMBOL_CALLS_LOCAL(INFO, H) \ 240 _bfd_elf_symbol_refs_local_p (H, INFO, 1) 241 242 /* Common symbols that are turned into definitions don't have the 243 DEF_REGULAR flag set, so they might appear to be undefined. */ 244 #define ELF_COMMON_DEF_P(H) \ 245 (!(H)->def_regular \ 246 && !(H)->def_dynamic \ 247 && (H)->root.type == bfd_link_hash_defined) 248 249 /* Records local symbols to be emitted in the dynamic symbol table. */ 250 251 struct elf_link_local_dynamic_entry 252 { 253 struct elf_link_local_dynamic_entry *next; 254 255 /* The input bfd this symbol came from. */ 256 bfd *input_bfd; 257 258 /* The index of the local symbol being copied. */ 259 long input_indx; 260 261 /* The index in the outgoing dynamic symbol table. */ 262 long dynindx; 263 264 /* A copy of the input symbol. */ 265 Elf_Internal_Sym isym; 266 }; 267 268 struct elf_link_loaded_list 269 { 270 struct elf_link_loaded_list *next; 271 bfd *abfd; 272 }; 273 274 /* Structures used by the eh_frame optimization code. */ 275 struct eh_cie_fde 276 { 277 union { 278 struct { 279 /* If REMOVED == 1, this is the CIE that the FDE originally used. 280 The CIE belongs to the same .eh_frame input section as the FDE. 281 282 If REMOVED == 0, this is the CIE that we have chosen to use for 283 the output FDE. The CIE's REMOVED field is also 0, but the CIE 284 might belong to a different .eh_frame input section from the FDE. 285 286 May be NULL to signify that the FDE should be discarded. */ 287 struct eh_cie_fde *cie_inf; 288 struct eh_cie_fde *next_for_section; 289 } fde; 290 struct { 291 /* CIEs have three states: 292 293 - REMOVED && !MERGED: Slated for removal because we haven't yet 294 proven that an FDE needs it. FULL_CIE, if nonnull, points to 295 more detailed information about the CIE. 296 297 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH, 298 which may not belong to the same input section. 299 300 - !REMOVED: We have decided to keep this CIE. SEC is the 301 .eh_frame input section that contains the CIE. */ 302 union { 303 struct cie *full_cie; 304 struct eh_cie_fde *merged_with; 305 asection *sec; 306 } u; 307 308 /* The offset of the personality data from the start of the CIE, 309 or 0 if the CIE doesn't have any. */ 310 unsigned int personality_offset : 8; 311 312 /* True if we have marked relocations associated with this CIE. */ 313 unsigned int gc_mark : 1; 314 315 /* True if we have decided to turn an absolute LSDA encoding into 316 a PC-relative one. */ 317 unsigned int make_lsda_relative : 1; 318 319 /* True if we have decided to turn an absolute personality 320 encoding into a PC-relative one. */ 321 unsigned int make_per_encoding_relative : 1; 322 323 /* True if the CIE contains personality data and if that 324 data uses a PC-relative encoding. Always true when 325 make_per_encoding_relative is. */ 326 unsigned int per_encoding_relative : 1; 327 328 /* True if we need to add an 'R' (FDE encoding) entry to the 329 CIE's augmentation data. */ 330 unsigned int add_fde_encoding : 1; 331 332 /* True if we have merged this CIE with another. */ 333 unsigned int merged : 1; 334 335 /* Unused bits. */ 336 unsigned int pad1 : 18; 337 } cie; 338 } u; 339 unsigned int reloc_index; 340 unsigned int size; 341 unsigned int offset; 342 unsigned int new_offset; 343 unsigned int fde_encoding : 8; 344 unsigned int lsda_encoding : 8; 345 unsigned int lsda_offset : 8; 346 347 /* True if this entry represents a CIE, false if it represents an FDE. */ 348 unsigned int cie : 1; 349 350 /* True if this entry is currently marked for removal. */ 351 unsigned int removed : 1; 352 353 /* True if we need to add a 'z' (augmentation size) entry to the CIE's 354 augmentation data, and an associated byte to each of the CIE's FDEs. */ 355 unsigned int add_augmentation_size : 1; 356 357 /* True if we have decided to convert absolute FDE relocations into 358 relative ones. This applies to the first relocation in the FDE, 359 which is against the code that the FDE describes. */ 360 unsigned int make_relative : 1; 361 362 /* Unused bits. */ 363 unsigned int pad1 : 4; 364 365 unsigned int *set_loc; 366 }; 367 368 struct eh_frame_sec_info 369 { 370 unsigned int count; 371 struct cie *cies; 372 struct eh_cie_fde entry[1]; 373 }; 374 375 struct eh_frame_array_ent 376 { 377 bfd_vma initial_loc; 378 bfd_size_type range; 379 bfd_vma fde; 380 }; 381 382 struct htab; 383 384 struct eh_frame_hdr_info 385 { 386 struct htab *cies; 387 asection *hdr_sec; 388 unsigned int fde_count, array_count; 389 struct eh_frame_array_ent *array; 390 /* TRUE if .eh_frame_hdr should contain the sorted search table. 391 We build it if we successfully read all .eh_frame input sections 392 and recognize them. */ 393 bfd_boolean table; 394 }; 395 396 /* Enum used to identify target specific extensions to the elf_obj_tdata 397 and elf_link_hash_table structures. Note the enums deliberately start 398 from 1 so that we can detect an uninitialized field. The generic value 399 is last so that additions to this enum do not need to modify more than 400 one line. */ 401 enum elf_target_id 402 { 403 AARCH64_ELF_DATA = 1, 404 ALPHA_ELF_DATA, 405 ARM_ELF_DATA, 406 AVR_ELF_DATA, 407 BFIN_ELF_DATA, 408 CRIS_ELF_DATA, 409 FRV_ELF_DATA, 410 HPPA32_ELF_DATA, 411 HPPA64_ELF_DATA, 412 I386_ELF_DATA, 413 IA64_ELF_DATA, 414 LM32_ELF_DATA, 415 M32R_ELF_DATA, 416 M68HC11_ELF_DATA, 417 M68K_ELF_DATA, 418 METAG_ELF_DATA, 419 MICROBLAZE_ELF_DATA, 420 MIPS_ELF_DATA, 421 MN10300_ELF_DATA, 422 NDS32_ELF_DATA, 423 NIOS2_ELF_DATA, 424 OR1K_ELF_DATA, 425 PPC32_ELF_DATA, 426 PPC64_ELF_DATA, 427 S390_ELF_DATA, 428 SH_ELF_DATA, 429 SPARC_ELF_DATA, 430 SPU_ELF_DATA, 431 TIC6X_ELF_DATA, 432 X86_64_ELF_DATA, 433 XTENSA_ELF_DATA, 434 XGATE_ELF_DATA, 435 TILEGX_ELF_DATA, 436 TILEPRO_ELF_DATA, 437 GENERIC_ELF_DATA 438 }; 439 440 /* ELF linker hash table. */ 441 442 struct elf_link_hash_table 443 { 444 struct bfd_link_hash_table root; 445 446 /* An identifier used to distinguish different target 447 specific extensions to this structure. */ 448 enum elf_target_id hash_table_id; 449 450 /* Whether we have created the special dynamic sections required 451 when linking against or generating a shared object. */ 452 bfd_boolean dynamic_sections_created; 453 454 /* True if this target has relocatable executables, so needs dynamic 455 section symbols. */ 456 bfd_boolean is_relocatable_executable; 457 458 /* The BFD used to hold special sections created by the linker. 459 This will be the first BFD found which requires these sections to 460 be created. */ 461 bfd *dynobj; 462 463 /* The value to use when initialising got.refcount/offset and 464 plt.refcount/offset in an elf_link_hash_entry. Set to zero when 465 the values are refcounts. Set to init_got_offset/init_plt_offset 466 in size_dynamic_sections when the values may be offsets. */ 467 union gotplt_union init_got_refcount; 468 union gotplt_union init_plt_refcount; 469 470 /* The value to use for got.refcount/offset and plt.refcount/offset 471 when the values may be offsets. Normally (bfd_vma) -1. */ 472 union gotplt_union init_got_offset; 473 union gotplt_union init_plt_offset; 474 475 /* The number of symbols found in the link which must be put into 476 the .dynsym section. */ 477 bfd_size_type dynsymcount; 478 479 /* The string table of dynamic symbols, which becomes the .dynstr 480 section. */ 481 struct elf_strtab_hash *dynstr; 482 483 /* The number of buckets in the hash table in the .hash section. 484 This is based on the number of dynamic symbols. */ 485 bfd_size_type bucketcount; 486 487 /* A linked list of DT_NEEDED names found in dynamic objects 488 included in the link. */ 489 struct bfd_link_needed_list *needed; 490 491 /* Sections in the output bfd that provides a section symbol 492 to be used by relocations emitted against local symbols. 493 Most targets will not use data_index_section. */ 494 asection *text_index_section; 495 asection *data_index_section; 496 497 /* The _GLOBAL_OFFSET_TABLE_ symbol. */ 498 struct elf_link_hash_entry *hgot; 499 500 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */ 501 struct elf_link_hash_entry *hplt; 502 503 /* The _DYNAMIC symbol. */ 504 struct elf_link_hash_entry *hdynamic; 505 506 /* A pointer to information used to merge SEC_MERGE sections. */ 507 void *merge_info; 508 509 /* Used to link stabs in sections. */ 510 struct stab_info stab_info; 511 512 /* Used by eh_frame code when editing .eh_frame. */ 513 struct eh_frame_hdr_info eh_info; 514 515 /* A linked list of local symbols to be added to .dynsym. */ 516 struct elf_link_local_dynamic_entry *dynlocal; 517 518 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic 519 objects included in the link. */ 520 struct bfd_link_needed_list *runpath; 521 522 /* Cached first output tls section and size of PT_TLS segment. */ 523 asection *tls_sec; 524 bfd_size_type tls_size; 525 526 /* A linked list of BFD's loaded in the link. */ 527 struct elf_link_loaded_list *loaded; 528 529 /* Short-cuts to get to dynamic linker sections. */ 530 asection *sgot; 531 asection *sgotplt; 532 asection *srelgot; 533 asection *splt; 534 asection *srelplt; 535 asection *igotplt; 536 asection *iplt; 537 asection *irelplt; 538 asection *irelifunc; 539 }; 540 541 /* Look up an entry in an ELF linker hash table. */ 542 543 #define elf_link_hash_lookup(table, string, create, copy, follow) \ 544 ((struct elf_link_hash_entry *) \ 545 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 546 (copy), (follow))) 547 548 /* Traverse an ELF linker hash table. */ 549 550 #define elf_link_hash_traverse(table, func, info) \ 551 (bfd_link_hash_traverse \ 552 (&(table)->root, \ 553 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 554 (info))) 555 556 /* Get the ELF linker hash table from a link_info structure. */ 557 558 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash)) 559 560 #define elf_hash_table_id(table) ((table) -> hash_table_id) 561 562 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */ 563 #define is_elf_hash_table(htab) \ 564 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table) 565 566 /* Used by bfd_sym_from_r_symndx to cache a small number of local 567 symbols. */ 568 #define LOCAL_SYM_CACHE_SIZE 32 569 struct sym_cache 570 { 571 bfd *abfd; 572 unsigned long indx[LOCAL_SYM_CACHE_SIZE]; 573 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE]; 574 }; 575 576 /* Constant information held for an ELF backend. */ 578 579 struct elf_size_info { 580 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr; 581 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note; 582 583 /* The size of entries in the .hash section. */ 584 unsigned char sizeof_hash_entry; 585 586 /* The number of internal relocations to allocate per external 587 relocation entry. */ 588 unsigned char int_rels_per_ext_rel; 589 /* We use some fixed size arrays. This should be large enough to 590 handle all back-ends. */ 591 #define MAX_INT_RELS_PER_EXT_REL 3 592 593 unsigned char arch_size, log_file_align; 594 unsigned char elfclass, ev_current; 595 int (*write_out_phdrs) 596 (bfd *, const Elf_Internal_Phdr *, unsigned int); 597 bfd_boolean 598 (*write_shdrs_and_ehdr) (bfd *); 599 bfd_boolean (*checksum_contents) 600 (bfd * , void (*) (const void *, size_t, void *), void *); 601 void (*write_relocs) 602 (bfd *, asection *, void *); 603 bfd_boolean (*swap_symbol_in) 604 (bfd *, const void *, const void *, Elf_Internal_Sym *); 605 void (*swap_symbol_out) 606 (bfd *, const Elf_Internal_Sym *, void *, void *); 607 bfd_boolean (*slurp_reloc_table) 608 (bfd *, asection *, asymbol **, bfd_boolean); 609 long (*slurp_symbol_table) 610 (bfd *, asymbol **, bfd_boolean); 611 void (*swap_dyn_in) 612 (bfd *, const void *, Elf_Internal_Dyn *); 613 void (*swap_dyn_out) 614 (bfd *, const Elf_Internal_Dyn *, void *); 615 616 /* This function is called to swap in a REL relocation. If an 617 external relocation corresponds to more than one internal 618 relocation, then all relocations are swapped in at once. */ 619 void (*swap_reloc_in) 620 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 621 622 /* This function is called to swap out a REL relocation. */ 623 void (*swap_reloc_out) 624 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 625 626 /* This function is called to swap in a RELA relocation. If an 627 external relocation corresponds to more than one internal 628 relocation, then all relocations are swapped in at once. */ 629 void (*swap_reloca_in) 630 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 631 632 /* This function is called to swap out a RELA relocation. */ 633 void (*swap_reloca_out) 634 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 635 }; 636 637 #define elf_symbol_from(ABFD,S) \ 638 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \ 639 && (S)->the_bfd->tdata.elf_obj_data != 0) \ 640 ? (elf_symbol_type *) (S) \ 641 : 0) 642 643 enum elf_reloc_type_class { 644 reloc_class_normal, 645 reloc_class_relative, 646 reloc_class_plt, 647 reloc_class_copy, 648 reloc_class_ifunc 649 }; 650 651 struct elf_reloc_cookie 652 { 653 Elf_Internal_Rela *rels, *rel, *relend; 654 Elf_Internal_Sym *locsyms; 655 bfd *abfd; 656 size_t locsymcount; 657 size_t extsymoff; 658 struct elf_link_hash_entry **sym_hashes; 659 int r_sym_shift; 660 bfd_boolean bad_symtab; 661 }; 662 663 /* The level of IRIX compatibility we're striving for. */ 664 665 typedef enum { 666 ict_none, 667 ict_irix5, 668 ict_irix6 669 } irix_compat_t; 670 671 /* Mapping of ELF section names and types. */ 672 struct bfd_elf_special_section 673 { 674 const char *prefix; 675 int prefix_length; 676 /* 0 means name must match PREFIX exactly. 677 -1 means name must start with PREFIX followed by an arbitrary string. 678 -2 means name must match PREFIX exactly or consist of PREFIX followed 679 by a dot then anything. 680 > 0 means name must start with the first PREFIX_LENGTH chars of 681 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */ 682 int suffix_length; 683 int type; 684 bfd_vma attr; 685 }; 686 687 enum action_discarded 688 { 689 COMPLAIN = 1, 690 PRETEND = 2 691 }; 692 693 typedef asection * (*elf_gc_mark_hook_fn) 694 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 695 struct elf_link_hash_entry *, Elf_Internal_Sym *); 696 697 struct elf_backend_data 698 { 699 /* The architecture for this backend. */ 700 enum bfd_architecture arch; 701 702 /* An identifier used to distinguish different target specific 703 extensions to elf_obj_tdata and elf_link_hash_table structures. */ 704 enum elf_target_id target_id; 705 706 /* The ELF machine code (EM_xxxx) for this backend. */ 707 int elf_machine_code; 708 709 /* EI_OSABI. */ 710 int elf_osabi; 711 712 /* The maximum page size for this backend. */ 713 bfd_vma maxpagesize; 714 715 /* The minimum page size for this backend. An input object will not be 716 considered page aligned unless its sections are correctly aligned for 717 pages at least this large. May be smaller than maxpagesize. */ 718 bfd_vma minpagesize; 719 720 /* The common page size for this backend. */ 721 bfd_vma commonpagesize; 722 723 /* The BFD flags applied to sections created for dynamic linking. */ 724 flagword dynamic_sec_flags; 725 726 /* Architecture-specific data for this backend. 727 This is actually a pointer to some type like struct elf_ARCH_data. */ 728 const void *arch_data; 729 730 /* A function to translate an ELF RELA relocation to a BFD arelent 731 structure. */ 732 void (*elf_info_to_howto) 733 (bfd *, arelent *, Elf_Internal_Rela *); 734 735 /* A function to translate an ELF REL relocation to a BFD arelent 736 structure. */ 737 void (*elf_info_to_howto_rel) 738 (bfd *, arelent *, Elf_Internal_Rela *); 739 740 /* A function to determine whether a symbol is global when 741 partitioning the symbol table into local and global symbols. 742 This should be NULL for most targets, in which case the correct 743 thing will be done. MIPS ELF, at least on the Irix 5, has 744 special requirements. */ 745 bfd_boolean (*elf_backend_sym_is_global) 746 (bfd *, asymbol *); 747 748 /* The remaining functions are hooks which are called only if they 749 are not NULL. */ 750 751 /* A function to permit a backend specific check on whether a 752 particular BFD format is relevant for an object file, and to 753 permit the backend to set any global information it wishes. When 754 this is called elf_elfheader is set, but anything else should be 755 used with caution. If this returns FALSE, the check_format 756 routine will return a bfd_error_wrong_format error. */ 757 bfd_boolean (*elf_backend_object_p) 758 (bfd *); 759 760 /* A function to do additional symbol processing when reading the 761 ELF symbol table. This is where any processor-specific special 762 section indices are handled. */ 763 void (*elf_backend_symbol_processing) 764 (bfd *, asymbol *); 765 766 /* A function to do additional symbol processing after reading the 767 entire ELF symbol table. */ 768 bfd_boolean (*elf_backend_symbol_table_processing) 769 (bfd *, elf_symbol_type *, unsigned int); 770 771 /* A function to set the type of the info field. Processor-specific 772 types should be handled here. */ 773 int (*elf_backend_get_symbol_type) 774 (Elf_Internal_Sym *, int); 775 776 /* A function to return the linker hash table entry of a symbol that 777 might be satisfied by an archive symbol. */ 778 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup) 779 (bfd *, struct bfd_link_info *, const char *); 780 781 /* Return true if local section symbols should have a non-null st_name. 782 NULL implies false. */ 783 bfd_boolean (*elf_backend_name_local_section_symbols) 784 (bfd *); 785 786 /* A function to do additional processing on the ELF section header 787 just before writing it out. This is used to set the flags and 788 type fields for some sections, or to actually write out data for 789 unusual sections. */ 790 bfd_boolean (*elf_backend_section_processing) 791 (bfd *, Elf_Internal_Shdr *); 792 793 /* A function to handle unusual section types when creating BFD 794 sections from ELF sections. */ 795 bfd_boolean (*elf_backend_section_from_shdr) 796 (bfd *, Elf_Internal_Shdr *, const char *, int); 797 798 /* A function to convert machine dependent ELF section header flags to 799 BFD internal section header flags. */ 800 bfd_boolean (*elf_backend_section_flags) 801 (flagword *, const Elf_Internal_Shdr *); 802 803 /* A function that returns a struct containing ELF section flags and 804 type for the given BFD section. */ 805 const struct bfd_elf_special_section * (*get_sec_type_attr) 806 (bfd *, asection *); 807 808 /* A function to handle unusual program segment types when creating BFD 809 sections from ELF program segments. */ 810 bfd_boolean (*elf_backend_section_from_phdr) 811 (bfd *, Elf_Internal_Phdr *, int, const char *); 812 813 /* A function to set up the ELF section header for a BFD section in 814 preparation for writing it out. This is where the flags and type 815 fields are set for unusual sections. */ 816 bfd_boolean (*elf_backend_fake_sections) 817 (bfd *, Elf_Internal_Shdr *, asection *); 818 819 /* A function to get the ELF section index for a BFD section. If 820 this returns TRUE, the section was found. If it is a normal ELF 821 section, *RETVAL should be left unchanged. If it is not a normal 822 ELF section *RETVAL should be set to the SHN_xxxx index. */ 823 bfd_boolean (*elf_backend_section_from_bfd_section) 824 (bfd *, asection *, int *retval); 825 826 /* If this field is not NULL, it is called by the add_symbols phase 827 of a link just before adding a symbol to the global linker hash 828 table. It may modify any of the fields as it wishes. If *NAME 829 is set to NULL, the symbol will be skipped rather than being 830 added to the hash table. This function is responsible for 831 handling all processor dependent symbol bindings and section 832 indices, and must set at least *FLAGS and *SEC for each processor 833 dependent case; failure to do so will cause a link error. */ 834 bfd_boolean (*elf_add_symbol_hook) 835 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *, 836 const char **name, flagword *flags, asection **sec, bfd_vma *value); 837 838 /* If this field is not NULL, it is called by the elf_link_output_sym 839 phase of a link for each symbol which will appear in the object file. 840 On error, this function returns 0. 1 is returned when the symbol 841 should be output, 2 is returned when the symbol should be discarded. */ 842 int (*elf_backend_link_output_symbol_hook) 843 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *, 844 asection *, struct elf_link_hash_entry *); 845 846 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend 847 linker the first time it encounters a dynamic object in the link. 848 This function must create any sections required for dynamic 849 linking. The ABFD argument is a dynamic object. The .interp, 850 .dynamic, .dynsym, .dynstr, and .hash functions have already been 851 created, and this function may modify the section flags if 852 desired. This function will normally create the .got and .plt 853 sections, but different backends have different requirements. */ 854 bfd_boolean (*elf_backend_create_dynamic_sections) 855 (bfd *abfd, struct bfd_link_info *info); 856 857 /* When creating a shared library, determine whether to omit the 858 dynamic symbol for the section. */ 859 bfd_boolean (*elf_backend_omit_section_dynsym) 860 (bfd *output_bfd, struct bfd_link_info *info, asection *osec); 861 862 /* Return TRUE if relocations of targets are compatible to the extent 863 that CHECK_RELOCS will properly process them. PR 4424. */ 864 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *); 865 866 /* The CHECK_RELOCS function is called by the add_symbols phase of 867 the ELF backend linker. It is called once for each section with 868 relocs of an object file, just after the symbols for the object 869 file have been added to the global linker hash table. The 870 function must look through the relocs and do any special handling 871 required. This generally means allocating space in the global 872 offset table, and perhaps allocating space for a reloc. The 873 relocs are always passed as Rela structures; if the section 874 actually uses Rel structures, the r_addend field will always be 875 zero. */ 876 bfd_boolean (*check_relocs) 877 (bfd *abfd, struct bfd_link_info *info, asection *o, 878 const Elf_Internal_Rela *relocs); 879 880 /* The CHECK_DIRECTIVES function is called once per input file by 881 the add_symbols phase of the ELF backend linker. The function 882 must inspect the bfd and create any additional symbols according 883 to any custom directives in the bfd. */ 884 bfd_boolean (*check_directives) 885 (bfd *abfd, struct bfd_link_info *info); 886 887 /* The NOTICE_AS_NEEDED function is called as the linker is about to 888 handle an as-needed lib (ACT = notice_as_needed), and after the 889 linker has decided to keep the lib (ACT = notice_needed) or when 890 the lib is not needed (ACT = notice_not_needed). */ 891 bfd_boolean (*notice_as_needed) 892 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act); 893 894 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend 895 linker for every symbol which is defined by a dynamic object and 896 referenced by a regular object. This is called after all the 897 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS 898 function has been called. The hash table entry should be 899 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be 900 defined in a section from a dynamic object. Dynamic object 901 sections are not included in the final link, and this function is 902 responsible for changing the value to something which the rest of 903 the link can deal with. This will normally involve adding an 904 entry to the .plt or .got or some such section, and setting the 905 symbol to point to that. */ 906 bfd_boolean (*elf_backend_adjust_dynamic_symbol) 907 (struct bfd_link_info *info, struct elf_link_hash_entry *h); 908 909 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker 910 after all the linker input files have been seen but before the 911 section sizes have been set. This is called after 912 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */ 913 bfd_boolean (*elf_backend_always_size_sections) 914 (bfd *output_bfd, struct bfd_link_info *info); 915 916 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend 917 linker after all the linker input files have been seen but before 918 the sections sizes have been set. This is called after 919 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols. 920 It is only called when linking against a dynamic object. It must 921 set the sizes of the dynamic sections, and may fill in their 922 contents as well. The generic ELF linker can handle the .dynsym, 923 .dynstr and .hash sections. This function must handle the 924 .interp section and any sections created by the 925 CREATE_DYNAMIC_SECTIONS entry point. */ 926 bfd_boolean (*elf_backend_size_dynamic_sections) 927 (bfd *output_bfd, struct bfd_link_info *info); 928 929 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections 930 we keep to use as a base for relocs and symbols. */ 931 void (*elf_backend_init_index_section) 932 (bfd *output_bfd, struct bfd_link_info *info); 933 934 /* The RELOCATE_SECTION function is called by the ELF backend linker 935 to handle the relocations for a section. 936 937 The relocs are always passed as Rela structures; if the section 938 actually uses Rel structures, the r_addend field will always be 939 zero. 940 941 This function is responsible for adjust the section contents as 942 necessary, and (if using Rela relocs and generating a 943 relocatable output file) adjusting the reloc addend as 944 necessary. 945 946 This function does not have to worry about setting the reloc 947 address or the reloc symbol index. 948 949 LOCAL_SYMS is a pointer to the swapped in local symbols. 950 951 LOCAL_SECTIONS is an array giving the section in the input file 952 corresponding to the st_shndx field of each local symbol. 953 954 The global hash table entry for the global symbols can be found 955 via elf_sym_hashes (input_bfd). 956 957 When generating relocatable output, this function must handle 958 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 959 going to be the section symbol corresponding to the output 960 section, which means that the addend must be adjusted 961 accordingly. 962 963 Returns FALSE on error, TRUE on success, 2 if successful and 964 relocations should be written for this section. */ 965 int (*elf_backend_relocate_section) 966 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, 967 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, 968 Elf_Internal_Sym *local_syms, asection **local_sections); 969 970 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend 971 linker just before it writes a symbol out to the .dynsym section. 972 The processor backend may make any required adjustment to the 973 symbol. It may also take the opportunity to set contents of the 974 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on 975 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called 976 on those symbols which are defined by a dynamic object. */ 977 bfd_boolean (*elf_backend_finish_dynamic_symbol) 978 (bfd *output_bfd, struct bfd_link_info *info, 979 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym); 980 981 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend 982 linker just before it writes all the dynamic sections out to the 983 output file. The FINISH_DYNAMIC_SYMBOL will have been called on 984 all dynamic symbols. */ 985 bfd_boolean (*elf_backend_finish_dynamic_sections) 986 (bfd *output_bfd, struct bfd_link_info *info); 987 988 /* A function to do any beginning processing needed for the ELF file 989 before building the ELF headers and computing file positions. */ 990 void (*elf_backend_begin_write_processing) 991 (bfd *, struct bfd_link_info *); 992 993 /* A function to do any final processing needed for the ELF file 994 before writing it out. The LINKER argument is TRUE if this BFD 995 was created by the ELF backend linker. */ 996 void (*elf_backend_final_write_processing) 997 (bfd *, bfd_boolean linker); 998 999 /* This function is called by get_program_header_size. It should 1000 return the number of additional program segments which this BFD 1001 will need. It should return -1 on error. */ 1002 int (*elf_backend_additional_program_headers) 1003 (bfd *, struct bfd_link_info *); 1004 1005 /* This function is called to modify an existing segment map in a 1006 backend specific fashion. */ 1007 bfd_boolean (*elf_backend_modify_segment_map) 1008 (bfd *, struct bfd_link_info *); 1009 1010 /* This function is called to modify program headers just before 1011 they are written. */ 1012 bfd_boolean (*elf_backend_modify_program_headers) 1013 (bfd *, struct bfd_link_info *); 1014 1015 /* This function is called before section garbage collection to 1016 mark entry symbol sections. */ 1017 void (*gc_keep) 1018 (struct bfd_link_info *); 1019 1020 /* This function is called during section garbage collection to 1021 mark sections that define global symbols. */ 1022 bfd_boolean (*gc_mark_dynamic_ref) 1023 (struct elf_link_hash_entry *, void *); 1024 1025 /* This function is called during section gc to discover the section a 1026 particular relocation refers to. */ 1027 elf_gc_mark_hook_fn gc_mark_hook; 1028 1029 /* This function, if defined, is called after the first gc marking pass 1030 to allow the backend to mark additional sections. */ 1031 bfd_boolean (*gc_mark_extra_sections) 1032 (struct bfd_link_info *, elf_gc_mark_hook_fn); 1033 1034 /* This function, if defined, is called during the sweep phase of gc 1035 in order that a backend might update any data structures it might 1036 be maintaining. */ 1037 bfd_boolean (*gc_sweep_hook) 1038 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); 1039 1040 /* This function, if defined, is called after the ELF headers have 1041 been created. This allows for things like the OS and ABI versions 1042 to be changed. */ 1043 void (*elf_backend_post_process_headers) 1044 (bfd *, struct bfd_link_info *); 1045 1046 /* This function, if defined, prints a symbol to file and returns the 1047 name of the symbol to be printed. It should return NULL to fall 1048 back to default symbol printing. */ 1049 const char *(*elf_backend_print_symbol_all) 1050 (bfd *, void *, asymbol *); 1051 1052 /* This function, if defined, is called after all local symbols and 1053 global symbols converted to locals are emitted into the symtab 1054 section. It allows the backend to emit special local symbols 1055 not handled in the hash table. */ 1056 bfd_boolean (*elf_backend_output_arch_local_syms) 1057 (bfd *, struct bfd_link_info *, void *, 1058 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1059 struct elf_link_hash_entry *)); 1060 1061 /* This function, if defined, is called after all symbols are emitted 1062 into the symtab section. It allows the backend to emit special 1063 global symbols not handled in the hash table. */ 1064 bfd_boolean (*elf_backend_output_arch_syms) 1065 (bfd *, struct bfd_link_info *, void *, 1066 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1067 struct elf_link_hash_entry *)); 1068 1069 /* Copy any information related to dynamic linking from a pre-existing 1070 symbol to a newly created symbol. Also called to copy flags and 1071 other back-end info to a weakdef, in which case the symbol is not 1072 newly created and plt/got refcounts and dynamic indices should not 1073 be copied. */ 1074 void (*elf_backend_copy_indirect_symbol) 1075 (struct bfd_link_info *, struct elf_link_hash_entry *, 1076 struct elf_link_hash_entry *); 1077 1078 /* Modify any information related to dynamic linking such that the 1079 symbol is not exported. */ 1080 void (*elf_backend_hide_symbol) 1081 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1082 1083 /* A function to do additional symbol fixup, called by 1084 _bfd_elf_fix_symbol_flags. */ 1085 bfd_boolean (*elf_backend_fixup_symbol) 1086 (struct bfd_link_info *, struct elf_link_hash_entry *); 1087 1088 /* Merge the backend specific symbol attribute. */ 1089 void (*elf_backend_merge_symbol_attribute) 1090 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean, 1091 bfd_boolean); 1092 1093 /* This function, if defined, will return a string containing the 1094 name of a target-specific dynamic tag. */ 1095 char *(*elf_backend_get_target_dtag) 1096 (bfd_vma); 1097 1098 /* Decide whether an undefined symbol is special and can be ignored. 1099 This is the case for OPTIONAL symbols on IRIX. */ 1100 bfd_boolean (*elf_backend_ignore_undef_symbol) 1101 (struct elf_link_hash_entry *); 1102 1103 /* Emit relocations. Overrides default routine for emitting relocs, 1104 except during a relocatable link, or if all relocs are being emitted. */ 1105 bfd_boolean (*elf_backend_emit_relocs) 1106 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 1107 struct elf_link_hash_entry **); 1108 1109 /* Count relocations. Not called for relocatable links 1110 or if all relocs are being preserved in the output. */ 1111 unsigned int (*elf_backend_count_relocs) 1112 (struct bfd_link_info *, asection *); 1113 1114 /* This function, if defined, is called when an NT_PRSTATUS note is found 1115 in a core file. */ 1116 bfd_boolean (*elf_backend_grok_prstatus) 1117 (bfd *, Elf_Internal_Note *); 1118 1119 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO 1120 note is found in a core file. */ 1121 bfd_boolean (*elf_backend_grok_psinfo) 1122 (bfd *, Elf_Internal_Note *); 1123 1124 /* This function, if defined, is called to write a note to a corefile. */ 1125 char *(*elf_backend_write_core_note) 1126 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...); 1127 1128 /* This function, if defined, is called to convert target-specific 1129 section flag names into hex values. */ 1130 flagword (*elf_backend_lookup_section_flags_hook) 1131 (char *); 1132 1133 /* This function returns class of a reloc type. */ 1134 enum elf_reloc_type_class (*elf_backend_reloc_type_class) 1135 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *); 1136 1137 /* This function, if defined, removes information about discarded functions 1138 from other sections which mention them. */ 1139 bfd_boolean (*elf_backend_discard_info) 1140 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *); 1141 1142 /* This function, if defined, signals that the function above has removed 1143 the discarded relocations for this section. */ 1144 bfd_boolean (*elf_backend_ignore_discarded_relocs) 1145 (asection *); 1146 1147 /* What to do when ld finds relocations against symbols defined in 1148 discarded sections. */ 1149 unsigned int (*action_discarded) 1150 (asection *); 1151 1152 /* This function returns the width of FDE pointers in bytes, or 0 if 1153 that can't be determined for some reason. The default definition 1154 goes by the bfd's EI_CLASS. */ 1155 unsigned int (*elf_backend_eh_frame_address_size) 1156 (bfd *, asection *); 1157 1158 /* These functions tell elf-eh-frame whether to attempt to turn 1159 absolute or lsda encodings into pc-relative ones. The default 1160 definition enables these transformations. */ 1161 bfd_boolean (*elf_backend_can_make_relative_eh_frame) 1162 (bfd *, struct bfd_link_info *, asection *); 1163 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame) 1164 (bfd *, struct bfd_link_info *, asection *); 1165 1166 /* This function returns an encoding after computing the encoded 1167 value (and storing it in ENCODED) for the given OFFSET into OSEC, 1168 to be stored in at LOC_OFFSET into the LOC_SEC input section. 1169 The default definition chooses a 32-bit PC-relative encoding. */ 1170 bfd_byte (*elf_backend_encode_eh_address) 1171 (bfd *abfd, struct bfd_link_info *info, 1172 asection *osec, bfd_vma offset, 1173 asection *loc_sec, bfd_vma loc_offset, 1174 bfd_vma *encoded); 1175 1176 /* This function, if defined, may write out the given section. 1177 Returns TRUE if it did so and FALSE if the caller should. */ 1178 bfd_boolean (*elf_backend_write_section) 1179 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1180 1181 /* The level of IRIX compatibility we're striving for. 1182 MIPS ELF specific function. */ 1183 irix_compat_t (*elf_backend_mips_irix_compat) 1184 (bfd *); 1185 1186 reloc_howto_type *(*elf_backend_mips_rtype_to_howto) 1187 (unsigned int, bfd_boolean); 1188 1189 /* The swapping table to use when dealing with ECOFF information. 1190 Used for the MIPS ELF .mdebug section. */ 1191 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap; 1192 1193 /* This function implements `bfd_elf_bfd_from_remote_memory'; 1194 see elf.c, elfcode.h. */ 1195 bfd *(*elf_backend_bfd_from_remote_memory) 1196 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 1197 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, 1198 bfd_size_type len)); 1199 1200 /* This function is used by `_bfd_elf_get_synthetic_symtab'; 1201 see elf.c. */ 1202 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *); 1203 1204 /* Is symbol defined in common section? */ 1205 bfd_boolean (*common_definition) (Elf_Internal_Sym *); 1206 1207 /* Return a common section index for section. */ 1208 unsigned int (*common_section_index) (asection *); 1209 1210 /* Return a common section for section. */ 1211 asection *(*common_section) (asection *); 1212 1213 /* Return TRUE if we can merge 2 definitions. */ 1214 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *, 1215 const Elf_Internal_Sym *, asection **, 1216 bfd_boolean, bfd_boolean, 1217 bfd *, const asection *); 1218 1219 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 1220 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *); 1221 1222 /* Return TRUE if type is a function symbol type. */ 1223 bfd_boolean (*is_function_type) (unsigned int type); 1224 1225 /* If the ELF symbol SYM might be a function in SEC, return the 1226 function size and set *CODE_OFF to the function's entry point, 1227 otherwise return zero. */ 1228 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec, 1229 bfd_vma *code_off); 1230 1231 /* Used to handle bad SHF_LINK_ORDER input. */ 1232 bfd_error_handler_type link_order_error_handler; 1233 1234 /* Name of the PLT relocation section. */ 1235 const char *relplt_name; 1236 1237 /* Alternate EM_xxxx machine codes for this backend. */ 1238 int elf_machine_alt1; 1239 int elf_machine_alt2; 1240 1241 const struct elf_size_info *s; 1242 1243 /* An array of target specific special sections. */ 1244 const struct bfd_elf_special_section *special_sections; 1245 1246 /* The size in bytes of the header for the GOT. This includes the 1247 so-called reserved entries on some systems. */ 1248 bfd_vma got_header_size; 1249 1250 /* The size of the GOT entry for the symbol pointed to by H if non-NULL, 1251 otherwise by the local symbol with index SYMNDX in IBFD. */ 1252 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *, 1253 struct elf_link_hash_entry *h, 1254 bfd *ibfd, unsigned long symndx); 1255 1256 /* The vendor name to use for a processor-standard attributes section. */ 1257 const char *obj_attrs_vendor; 1258 1259 /* The section name to use for a processor-standard attributes section. */ 1260 const char *obj_attrs_section; 1261 1262 /* Return 1, 2 or 3 to indicate what type of arguments a 1263 processor-specific tag takes. */ 1264 int (*obj_attrs_arg_type) (int); 1265 1266 /* The section type to use for an attributes section. */ 1267 unsigned int obj_attrs_section_type; 1268 1269 /* This function determines the order in which any attributes are 1270 written. It must be defined for input in the range 1271 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range 1272 is used in order to make unity easy). The returned value is the 1273 actual tag number to place in the input position. */ 1274 int (*obj_attrs_order) (int); 1275 1276 /* Handle merging unknown attributes; either warn and return TRUE, 1277 or give an error and return FALSE. */ 1278 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int); 1279 1280 /* This is non-zero if static TLS segments require a special alignment. */ 1281 unsigned static_tls_alignment; 1282 1283 /* Alignment for the PT_GNU_STACK segment. */ 1284 unsigned stack_align; 1285 1286 /* This is TRUE if the linker should act like collect and gather 1287 global constructors and destructors by name. This is TRUE for 1288 MIPS ELF because the Irix 5 tools can not handle the .init 1289 section. */ 1290 unsigned collect : 1; 1291 1292 /* This is TRUE if the linker should ignore changes to the type of a 1293 symbol. This is TRUE for MIPS ELF because some Irix 5 objects 1294 record undefined functions as STT_OBJECT although the definitions 1295 are STT_FUNC. */ 1296 unsigned type_change_ok : 1; 1297 1298 /* Whether the backend may use REL relocations. (Some backends use 1299 both REL and RELA relocations, and this flag is set for those 1300 backends.) */ 1301 unsigned may_use_rel_p : 1; 1302 1303 /* Whether the backend may use RELA relocations. (Some backends use 1304 both REL and RELA relocations, and this flag is set for those 1305 backends.) */ 1306 unsigned may_use_rela_p : 1; 1307 1308 /* Whether the default relocation type is RELA. If a backend with 1309 this flag set wants REL relocations for a particular section, 1310 it must note that explicitly. Similarly, if this flag is clear, 1311 and the backend wants RELA relocations for a particular 1312 section. */ 1313 unsigned default_use_rela_p : 1; 1314 1315 /* True if PLT and copy relocations should be RELA by default. */ 1316 unsigned rela_plts_and_copies_p : 1; 1317 1318 /* Set if RELA relocations for a relocatable link can be handled by 1319 generic code. Backends that set this flag need do nothing in the 1320 backend relocate_section routine for relocatable linking. */ 1321 unsigned rela_normal : 1; 1322 1323 /* TRUE if addresses "naturally" sign extend. This is used when 1324 swapping in from Elf32 when BFD64. */ 1325 unsigned sign_extend_vma : 1; 1326 1327 unsigned want_got_plt : 1; 1328 unsigned plt_readonly : 1; 1329 unsigned want_plt_sym : 1; 1330 unsigned plt_not_loaded : 1; 1331 unsigned plt_alignment : 4; 1332 unsigned can_gc_sections : 1; 1333 unsigned can_refcount : 1; 1334 unsigned want_got_sym : 1; 1335 unsigned want_dynbss : 1; 1336 1337 /* Targets which do not support physical addressing often require 1338 that the p_paddr field in the section header to be set to zero. 1339 This field indicates whether this behavior is required. */ 1340 unsigned want_p_paddr_set_to_zero : 1; 1341 1342 /* True if an object file lacking a .note.GNU-stack section 1343 should be assumed to be requesting exec stack. At least one 1344 other file in the link needs to have a .note.GNU-stack section 1345 for a PT_GNU_STACK segment to be created. */ 1346 unsigned default_execstack : 1; 1347 1348 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize 1349 in length rather than sec->size in length, if sec->rawsize is 1350 non-zero and smaller than sec->size. */ 1351 unsigned caches_rawsize : 1; 1352 }; 1353 1354 /* Information about reloc sections associated with a bfd_elf_section_data 1355 structure. */ 1356 struct bfd_elf_section_reloc_data 1357 { 1358 /* The ELF header for the reloc section associated with this 1359 section, if any. */ 1360 Elf_Internal_Shdr *hdr; 1361 /* The number of relocations currently assigned to HDR. */ 1362 unsigned int count; 1363 /* The ELF section number of the reloc section. Only used for an 1364 output file. */ 1365 int idx; 1366 /* Used by the backend linker to store the symbol hash table entries 1367 associated with relocs against global symbols. */ 1368 struct elf_link_hash_entry **hashes; 1369 }; 1370 1371 /* Information stored for each BFD section in an ELF file. This 1372 structure is allocated by elf_new_section_hook. */ 1373 1374 struct bfd_elf_section_data 1375 { 1376 /* The ELF header for this section. */ 1377 Elf_Internal_Shdr this_hdr; 1378 1379 /* INPUT_SECTION_FLAGS if specified in the linker script. */ 1380 struct flag_info *section_flag_info; 1381 1382 /* Information about the REL and RELA reloc sections associated 1383 with this section, if any. */ 1384 struct bfd_elf_section_reloc_data rel, rela; 1385 1386 /* The ELF section number of this section. */ 1387 int this_idx; 1388 1389 /* Used by the backend linker when generating a shared library to 1390 record the dynamic symbol index for a section symbol 1391 corresponding to this section. A value of 0 means that there is 1392 no dynamic symbol for this section. */ 1393 int dynindx; 1394 1395 /* A pointer to the linked-to section for SHF_LINK_ORDER. */ 1396 asection *linked_to; 1397 1398 /* A pointer to the swapped relocs. If the section uses REL relocs, 1399 rather than RELA, all the r_addend fields will be zero. This 1400 pointer may be NULL. It is used by the backend linker. */ 1401 Elf_Internal_Rela *relocs; 1402 1403 /* A pointer to a linked list tracking dynamic relocs copied for 1404 local symbols. */ 1405 void *local_dynrel; 1406 1407 /* A pointer to the bfd section used for dynamic relocs. */ 1408 asection *sreloc; 1409 1410 union { 1411 /* Group name, if this section is a member of a group. */ 1412 const char *name; 1413 1414 /* Group signature sym, if this is the SHT_GROUP section. */ 1415 struct bfd_symbol *id; 1416 } group; 1417 1418 /* For a member of a group, points to the SHT_GROUP section. 1419 NULL for the SHT_GROUP section itself and non-group sections. */ 1420 asection *sec_group; 1421 1422 /* A linked list of member sections in the group. Circular when used by 1423 the linker. For the SHT_GROUP section, points at first member. */ 1424 asection *next_in_group; 1425 1426 /* The FDEs associated with this section. The u.fde.next_in_section 1427 field acts as a chain pointer. */ 1428 struct eh_cie_fde *fde_list; 1429 1430 /* A pointer used for various section optimizations. */ 1431 void *sec_info; 1432 }; 1433 1434 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd) 1435 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to) 1436 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type) 1437 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags) 1438 #define elf_group_name(sec) (elf_section_data(sec)->group.name) 1439 #define elf_group_id(sec) (elf_section_data(sec)->group.id) 1440 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group) 1441 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list) 1442 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group) 1443 1444 #define xvec_get_elf_backend_data(xvec) \ 1445 ((const struct elf_backend_data *) (xvec)->backend_data) 1446 1447 #define get_elf_backend_data(abfd) \ 1448 xvec_get_elf_backend_data ((abfd)->xvec) 1449 1450 /* The least object attributes (within an attributes subsection) known 1451 for any target. Some code assumes that the value 0 is not used and 1452 the field for that attribute can instead be used as a marker to 1453 indicate that attributes have been initialized. */ 1454 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2 1455 1456 /* The maximum number of known object attributes for any target. */ 1457 #define NUM_KNOWN_OBJ_ATTRIBUTES 71 1458 1459 /* The value of an object attribute. The type indicates whether the attribute 1460 holds and integer, a string, or both. It can also indicate that there can 1461 be no default (i.e. all values must be written to file, even zero), and whether 1462 it exists in bfd to begin with. */ 1463 1464 typedef struct obj_attribute 1465 { 1466 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0) 1467 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1) 1468 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2) 1469 #define ATTR_TYPE_FLAG_EXIST (1 << 3) 1470 1471 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL) 1472 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL) 1473 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT) 1474 #define ATTR_TYPE_EXIST(TYPE) ((TYPE) & ATTR_TYPE_FLAG_EXIST) 1475 1476 int type; 1477 unsigned int i; 1478 char *s; 1479 } obj_attribute; 1480 1481 typedef struct obj_attribute_list 1482 { 1483 struct obj_attribute_list *next; 1484 int tag; 1485 obj_attribute attr; 1486 } obj_attribute_list; 1487 1488 /* Object attributes may either be defined by the processor ABI, index 1489 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific 1490 (and possibly also processor-specific), index OBJ_ATTR_GNU. */ 1491 #define OBJ_ATTR_PROC 0 1492 #define OBJ_ATTR_GNU 1 1493 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC 1494 #define OBJ_ATTR_LAST OBJ_ATTR_GNU 1495 1496 /* The following object attribute tags are taken as generic, for all 1497 targets and for "gnu" where there is no target standard. */ 1498 enum 1499 { 1500 Tag_NULL = 0, 1501 Tag_File = 1, 1502 Tag_Section = 2, 1503 Tag_Symbol = 3, 1504 Tag_compatibility = 32 1505 }; 1506 1507 /* The following struct stores information about every SystemTap section 1508 found in the object file. */ 1509 struct sdt_note 1510 { 1511 struct sdt_note *next; 1512 bfd_size_type size; 1513 bfd_byte data[1]; 1514 }; 1515 1516 /* NT_GNU_BUILD_ID note type info for input BFDs. */ 1517 struct elf_build_id 1518 { 1519 size_t size; 1520 bfd_byte data[1]; 1521 }; 1522 1523 /* tdata information grabbed from an elf core file. */ 1524 struct core_elf_obj_tdata 1525 { 1526 int signal; 1527 int pid; 1528 int lwpid; 1529 char* program; 1530 char* command; 1531 }; 1532 1533 /* Extra tdata information held for output ELF BFDs. */ 1534 struct output_elf_obj_tdata 1535 { 1536 struct elf_segment_map *seg_map; 1537 struct elf_strtab_hash *strtab_ptr; 1538 1539 /* STT_SECTION symbols for each section */ 1540 asymbol **section_syms; 1541 1542 /* Used to determine if PT_GNU_EH_FRAME segment header should be 1543 created. */ 1544 asection *eh_frame_hdr; 1545 1546 /* NT_GNU_BUILD_ID note type info. */ 1547 struct 1548 { 1549 bfd_boolean (*after_write_object_contents) (bfd *); 1550 const char *style; 1551 asection *sec; 1552 } build_id; 1553 1554 /* Records the result of `get_program_header_size'. */ 1555 bfd_size_type program_header_size; 1556 1557 /* Used when laying out sections. */ 1558 file_ptr next_file_pos; 1559 1560 int num_section_syms; 1561 unsigned int shstrtab_section, strtab_section; 1562 1563 /* Segment flags for the PT_GNU_STACK segment. */ 1564 unsigned int stack_flags; 1565 1566 /* This is set to TRUE if the object was created by the backend 1567 linker. */ 1568 bfd_boolean linker; 1569 1570 /* Used to determine if the e_flags field has been initialized */ 1571 bfd_boolean flags_init; 1572 }; 1573 1574 /* Some private data is stashed away for future use using the tdata pointer 1575 in the bfd structure. */ 1576 1577 struct elf_obj_tdata 1578 { 1579 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ 1580 Elf_Internal_Shdr **elf_sect_ptr; 1581 Elf_Internal_Phdr *phdr; 1582 Elf_Internal_Shdr symtab_hdr; 1583 Elf_Internal_Shdr shstrtab_hdr; 1584 Elf_Internal_Shdr strtab_hdr; 1585 Elf_Internal_Shdr dynsymtab_hdr; 1586 Elf_Internal_Shdr dynstrtab_hdr; 1587 Elf_Internal_Shdr dynversym_hdr; 1588 Elf_Internal_Shdr dynverref_hdr; 1589 Elf_Internal_Shdr dynverdef_hdr; 1590 Elf_Internal_Shdr symtab_shndx_hdr; 1591 bfd_vma gp; /* The gp value */ 1592 unsigned int gp_size; /* The gp size */ 1593 unsigned int num_elf_sections; /* elf_sect_ptr size */ 1594 1595 /* A mapping from external symbols to entries in the linker hash 1596 table, used when linking. This is indexed by the symbol index 1597 minus the sh_info field of the symbol table header. */ 1598 struct elf_link_hash_entry **sym_hashes; 1599 1600 /* Track usage and final offsets of GOT entries for local symbols. 1601 This array is indexed by symbol index. Elements are used 1602 identically to "got" in struct elf_link_hash_entry. */ 1603 union 1604 { 1605 bfd_signed_vma *refcounts; 1606 bfd_vma *offsets; 1607 struct got_entry **ents; 1608 } local_got; 1609 1610 /* The linker ELF emulation code needs to let the backend ELF linker 1611 know what filename should be used for a dynamic object if the 1612 dynamic object is found using a search. The emulation code then 1613 sometimes needs to know what name was actually used. Until the 1614 file has been added to the linker symbol table, this field holds 1615 the name the linker wants. After it has been added, it holds the 1616 name actually used, which will be the DT_SONAME entry if there is 1617 one. */ 1618 const char *dt_name; 1619 1620 /* The linker emulation needs to know what audit libs 1621 are used by a dynamic object. */ 1622 const char *dt_audit; 1623 1624 /* Used by find_nearest_line entry point. */ 1625 void *line_info; 1626 1627 /* A place to stash dwarf1 info for this bfd. */ 1628 struct dwarf1_debug *dwarf1_find_line_info; 1629 1630 /* A place to stash dwarf2 info for this bfd. */ 1631 void *dwarf2_find_line_info; 1632 1633 /* Stash away info for yet another find line/function variant. */ 1634 void *elf_find_function_cache; 1635 1636 /* Number of symbol version definitions we are about to emit. */ 1637 unsigned int cverdefs; 1638 1639 /* Number of symbol version references we are about to emit. */ 1640 unsigned int cverrefs; 1641 1642 /* Symbol version definitions in external objects. */ 1643 Elf_Internal_Verdef *verdef; 1644 1645 /* Symbol version references to external objects. */ 1646 Elf_Internal_Verneed *verref; 1647 1648 /* A pointer to the .eh_frame section. */ 1649 asection *eh_frame_section; 1650 1651 /* Symbol buffer. */ 1652 void *symbuf; 1653 1654 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES]; 1655 obj_attribute_list *other_obj_attributes[2]; 1656 1657 /* NT_GNU_BUILD_ID note type. */ 1658 struct elf_build_id *build_id; 1659 1660 /* Linked-list containing information about every Systemtap section 1661 found in the object file. Each section corresponds to one entry 1662 in the list. */ 1663 struct sdt_note *sdt_note_head; 1664 1665 Elf_Internal_Shdr **group_sect_ptr; 1666 int num_group; 1667 1668 unsigned int symtab_section, symtab_shndx_section, dynsymtab_section; 1669 unsigned int dynversym_section, dynverdef_section, dynverref_section; 1670 1671 /* An identifier used to distinguish different target 1672 specific extensions to this structure. */ 1673 enum elf_target_id object_id; 1674 1675 /* Whether a dyanmic object was specified normally on the linker 1676 command line, or was specified when --as-needed was in effect, 1677 or was found via a DT_NEEDED entry. */ 1678 enum dynamic_lib_link_class dyn_lib_class; 1679 1680 /* Irix 5 often screws up the symbol table, sorting local symbols 1681 after global symbols. This flag is set if the symbol table in 1682 this BFD appears to be screwed up. If it is, we ignore the 1683 sh_info field in the symbol table header, and always read all the 1684 symbols. */ 1685 bfd_boolean bad_symtab; 1686 1687 /* True if the bfd contains symbols that have the STT_GNU_IFUNC 1688 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi 1689 field in the ELF header structure. */ 1690 bfd_boolean has_gnu_symbols; 1691 1692 /* Information grabbed from an elf core file. */ 1693 struct core_elf_obj_tdata *core; 1694 1695 /* More information held for output ELF BFDs. */ 1696 struct output_elf_obj_tdata *o; 1697 }; 1698 1699 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) 1700 1701 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id) 1702 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size) 1703 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) 1704 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) 1705 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections) 1706 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map) 1707 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos) 1708 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr) 1709 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker) 1710 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags) 1711 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr) 1712 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) 1713 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section) 1714 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section) 1715 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section) 1716 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr) 1717 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section) 1718 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section) 1719 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section) 1720 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section) 1721 #define elf_eh_frame_section(bfd) \ 1722 (elf_tdata(bfd) -> eh_frame_section) 1723 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms) 1724 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms) 1725 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) 1726 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) 1727 #define elf_gp(bfd) (elf_tdata(bfd) -> gp) 1728 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size) 1729 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes) 1730 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts) 1731 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets) 1732 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents) 1733 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name) 1734 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit) 1735 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class) 1736 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab) 1737 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init) 1738 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes) 1739 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes) 1740 #define elf_known_obj_attributes_proc(bfd) \ 1741 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1742 #define elf_other_obj_attributes_proc(bfd) \ 1743 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1744 1745 extern void _bfd_elf_swap_verdef_in 1747 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *); 1748 extern void _bfd_elf_swap_verdef_out 1749 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *); 1750 extern void _bfd_elf_swap_verdaux_in 1751 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *); 1752 extern void _bfd_elf_swap_verdaux_out 1753 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *); 1754 extern void _bfd_elf_swap_verneed_in 1755 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *); 1756 extern void _bfd_elf_swap_verneed_out 1757 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *); 1758 extern void _bfd_elf_swap_vernaux_in 1759 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *); 1760 extern void _bfd_elf_swap_vernaux_out 1761 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *); 1762 extern void _bfd_elf_swap_versym_in 1763 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *); 1764 extern void _bfd_elf_swap_versym_out 1765 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *); 1766 1767 extern unsigned int _bfd_elf_section_from_bfd_section 1768 (bfd *, asection *); 1769 extern char *bfd_elf_string_from_elf_section 1770 (bfd *, unsigned, unsigned); 1771 extern Elf_Internal_Sym *bfd_elf_get_elf_syms 1772 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *, 1773 Elf_External_Sym_Shndx *); 1774 extern const char *bfd_elf_sym_name 1775 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *); 1776 1777 extern bfd_boolean _bfd_elf_copy_private_bfd_data 1778 (bfd *, bfd *); 1779 extern bfd_boolean _bfd_elf_print_private_bfd_data 1780 (bfd *, void *); 1781 extern void bfd_elf_print_symbol 1782 (bfd *, void *, asymbol *, bfd_print_symbol_type); 1783 1784 extern unsigned int _bfd_elf_eh_frame_address_size 1785 (bfd *, asection *); 1786 extern bfd_byte _bfd_elf_encode_eh_address 1787 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset, 1788 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded); 1789 extern bfd_boolean _bfd_elf_can_make_relative 1790 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section); 1791 1792 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class 1793 (const struct bfd_link_info *, const asection *, 1794 const Elf_Internal_Rela *); 1795 extern bfd_vma _bfd_elf_rela_local_sym 1796 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *); 1797 extern bfd_vma _bfd_elf_rel_local_sym 1798 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma); 1799 extern bfd_vma _bfd_elf_section_offset 1800 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1801 1802 extern unsigned long bfd_elf_hash 1803 (const char *); 1804 extern unsigned long bfd_elf_gnu_hash 1805 (const char *); 1806 1807 extern bfd_reloc_status_type bfd_elf_generic_reloc 1808 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 1809 extern bfd_boolean bfd_elf_allocate_object 1810 (bfd *, size_t, enum elf_target_id); 1811 extern bfd_boolean bfd_elf_make_object 1812 (bfd *); 1813 extern bfd_boolean bfd_elf_mkcorefile 1814 (bfd *); 1815 extern bfd_boolean _bfd_elf_make_section_from_shdr 1816 (bfd *, Elf_Internal_Shdr *, const char *, int); 1817 extern bfd_boolean _bfd_elf_make_section_from_phdr 1818 (bfd *, Elf_Internal_Phdr *, int, const char *); 1819 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc 1820 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 1821 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create 1822 (bfd *); 1823 extern void _bfd_elf_link_hash_table_free 1824 (bfd *); 1825 extern void _bfd_elf_link_hash_copy_indirect 1826 (struct bfd_link_info *, struct elf_link_hash_entry *, 1827 struct elf_link_hash_entry *); 1828 extern void _bfd_elf_link_hash_hide_symbol 1829 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1830 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol 1831 (struct bfd_link_info *, struct elf_link_hash_entry *); 1832 extern bfd_boolean _bfd_elf_link_hash_table_init 1833 (struct elf_link_hash_table *, bfd *, 1834 struct bfd_hash_entry *(*) 1835 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *), 1836 unsigned int, enum elf_target_id); 1837 extern bfd_boolean _bfd_elf_slurp_version_tables 1838 (bfd *, bfd_boolean); 1839 extern bfd_boolean _bfd_elf_merge_sections 1840 (bfd *, struct bfd_link_info *); 1841 extern bfd_boolean _bfd_elf_match_sections_by_type 1842 (bfd *, const asection *, bfd *, const asection *); 1843 extern bfd_boolean bfd_elf_is_group_section 1844 (bfd *, const struct bfd_section *); 1845 extern bfd_boolean _bfd_elf_section_already_linked 1846 (bfd *, asection *, struct bfd_link_info *); 1847 extern void bfd_elf_set_group_contents 1848 (bfd *, asection *, void *); 1849 extern asection *_bfd_elf_check_kept_section 1850 (asection *, struct bfd_link_info *); 1851 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms 1852 extern void _bfd_elf_copy_link_hash_symbol_type 1853 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *); 1854 extern bfd_boolean _bfd_elf_size_group_sections 1855 (struct bfd_link_info *); 1856 extern bfd_boolean _bfd_elf_fixup_group_sections 1857 (bfd *, asection *); 1858 extern bfd_boolean _bfd_elf_copy_private_header_data 1859 (bfd *, bfd *); 1860 extern bfd_boolean _bfd_elf_copy_private_symbol_data 1861 (bfd *, asymbol *, bfd *, asymbol *); 1862 #define _bfd_generic_init_private_section_data \ 1863 _bfd_elf_init_private_section_data 1864 extern bfd_boolean _bfd_elf_init_private_section_data 1865 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *); 1866 extern bfd_boolean _bfd_elf_copy_private_section_data 1867 (bfd *, asection *, bfd *, asection *); 1868 extern bfd_boolean _bfd_elf_write_object_contents 1869 (bfd *); 1870 extern bfd_boolean _bfd_elf_write_corefile_contents 1871 (bfd *); 1872 extern bfd_boolean _bfd_elf_set_section_contents 1873 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 1874 extern long _bfd_elf_get_symtab_upper_bound 1875 (bfd *); 1876 extern long _bfd_elf_canonicalize_symtab 1877 (bfd *, asymbol **); 1878 extern long _bfd_elf_get_dynamic_symtab_upper_bound 1879 (bfd *); 1880 extern long _bfd_elf_canonicalize_dynamic_symtab 1881 (bfd *, asymbol **); 1882 extern long _bfd_elf_get_synthetic_symtab 1883 (bfd *, long, asymbol **, long, asymbol **, asymbol **); 1884 extern long _bfd_elf_get_reloc_upper_bound 1885 (bfd *, sec_ptr); 1886 extern long _bfd_elf_canonicalize_reloc 1887 (bfd *, sec_ptr, arelent **, asymbol **); 1888 extern asection * _bfd_elf_get_dynamic_reloc_section 1889 (bfd *, asection *, bfd_boolean); 1890 extern asection * _bfd_elf_make_dynamic_reloc_section 1891 (asection *, bfd *, unsigned int, bfd *, bfd_boolean); 1892 extern long _bfd_elf_get_dynamic_reloc_upper_bound 1893 (bfd *); 1894 extern long _bfd_elf_canonicalize_dynamic_reloc 1895 (bfd *, arelent **, asymbol **); 1896 extern asymbol *_bfd_elf_make_empty_symbol 1897 (bfd *); 1898 extern void _bfd_elf_get_symbol_info 1899 (bfd *, asymbol *, symbol_info *); 1900 extern bfd_boolean _bfd_elf_is_local_label_name 1901 (bfd *, const char *); 1902 extern alent *_bfd_elf_get_lineno 1903 (bfd *, asymbol *); 1904 extern bfd_boolean _bfd_elf_set_arch_mach 1905 (bfd *, enum bfd_architecture, unsigned long); 1906 extern bfd_boolean _bfd_elf_find_nearest_line 1907 (bfd *, asymbol **, asection *, bfd_vma, 1908 const char **, const char **, unsigned int *, unsigned int *); 1909 extern bfd_boolean _bfd_elf_find_line 1910 (bfd *, asymbol **, asymbol *, const char **, unsigned int *); 1911 extern bfd_boolean _bfd_elf_find_inliner_info 1912 (bfd *, const char **, const char **, unsigned int *); 1913 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols 1914 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 1915 extern int _bfd_elf_sizeof_headers 1916 (bfd *, struct bfd_link_info *); 1917 extern bfd_boolean _bfd_elf_new_section_hook 1918 (bfd *, asection *); 1919 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section 1920 (const char *, const struct bfd_elf_special_section *, unsigned int); 1921 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr 1922 (bfd *, asection *); 1923 1924 /* If the target doesn't have reloc handling written yet: */ 1925 extern void _bfd_elf_no_info_to_howto 1926 (bfd *, arelent *, Elf_Internal_Rela *); 1927 1928 extern bfd_boolean bfd_section_from_shdr 1929 (bfd *, unsigned int shindex); 1930 extern bfd_boolean bfd_section_from_phdr 1931 (bfd *, Elf_Internal_Phdr *, int); 1932 1933 extern int _bfd_elf_symbol_from_bfd_symbol 1934 (bfd *, asymbol **); 1935 1936 extern Elf_Internal_Sym *bfd_sym_from_r_symndx 1937 (struct sym_cache *, bfd *, unsigned long); 1938 extern asection *bfd_section_from_elf_index 1939 (bfd *, unsigned int); 1940 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init 1941 (void); 1942 1943 extern struct elf_strtab_hash * _bfd_elf_strtab_init 1944 (void); 1945 extern void _bfd_elf_strtab_free 1946 (struct elf_strtab_hash *); 1947 extern bfd_size_type _bfd_elf_strtab_add 1948 (struct elf_strtab_hash *, const char *, bfd_boolean); 1949 extern void _bfd_elf_strtab_addref 1950 (struct elf_strtab_hash *, bfd_size_type); 1951 extern void _bfd_elf_strtab_delref 1952 (struct elf_strtab_hash *, bfd_size_type); 1953 extern unsigned int _bfd_elf_strtab_refcount 1954 (struct elf_strtab_hash *, bfd_size_type); 1955 extern void _bfd_elf_strtab_clear_all_refs 1956 (struct elf_strtab_hash *tab); 1957 extern void _bfd_elf_strtab_restore_size 1958 (struct elf_strtab_hash *, bfd_size_type); 1959 extern bfd_size_type _bfd_elf_strtab_size 1960 (struct elf_strtab_hash *); 1961 extern bfd_size_type _bfd_elf_strtab_offset 1962 (struct elf_strtab_hash *, bfd_size_type); 1963 extern bfd_boolean _bfd_elf_strtab_emit 1964 (bfd *, struct elf_strtab_hash *); 1965 extern void _bfd_elf_strtab_finalize 1966 (struct elf_strtab_hash *); 1967 1968 extern void _bfd_elf_parse_eh_frame 1969 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 1970 extern bfd_boolean _bfd_elf_discard_section_eh_frame 1971 (bfd *, struct bfd_link_info *, asection *, 1972 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *); 1973 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr 1974 (bfd *, struct bfd_link_info *); 1975 extern bfd_vma _bfd_elf_eh_frame_section_offset 1976 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1977 extern bfd_boolean _bfd_elf_write_section_eh_frame 1978 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1979 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr 1980 (bfd *, struct bfd_link_info *); 1981 extern bfd_boolean _bfd_elf_eh_frame_present 1982 (struct bfd_link_info *); 1983 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr 1984 (struct bfd_link_info *); 1985 1986 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *); 1987 1988 extern long _bfd_elf_link_lookup_local_dynindx 1989 (struct bfd_link_info *, bfd *, long); 1990 extern bfd_boolean _bfd_elf_compute_section_file_positions 1991 (bfd *, struct bfd_link_info *); 1992 extern file_ptr _bfd_elf_assign_file_position_for_section 1993 (Elf_Internal_Shdr *, file_ptr, bfd_boolean); 1994 1995 extern bfd_boolean _bfd_elf_validate_reloc 1996 (bfd *, arelent *); 1997 1998 extern bfd_boolean _bfd_elf_link_create_dynamic_sections 1999 (bfd *, struct bfd_link_info *); 2000 extern bfd_boolean _bfd_elf_link_omit_section_dynsym 2001 (bfd *, struct bfd_link_info *, asection *); 2002 extern bfd_boolean _bfd_elf_create_dynamic_sections 2003 (bfd *, struct bfd_link_info *); 2004 extern bfd_boolean _bfd_elf_create_got_section 2005 (bfd *, struct bfd_link_info *); 2006 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym 2007 (bfd *, struct bfd_link_info *, asection *, const char *); 2008 extern void _bfd_elf_init_1_index_section 2009 (bfd *, struct bfd_link_info *); 2010 extern void _bfd_elf_init_2_index_sections 2011 (bfd *, struct bfd_link_info *); 2012 2013 extern bfd_boolean _bfd_elfcore_make_pseudosection 2014 (bfd *, char *, size_t, ufile_ptr); 2015 extern char *_bfd_elfcore_strndup 2016 (bfd *, char *, size_t); 2017 2018 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs 2019 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean); 2020 2021 extern bfd_boolean _bfd_elf_link_output_relocs 2022 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 2023 struct elf_link_hash_entry **); 2024 2025 extern bfd_boolean _bfd_elf_adjust_dynamic_copy 2026 (struct elf_link_hash_entry *, asection *); 2027 2028 extern bfd_boolean _bfd_elf_dynamic_symbol_p 2029 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2030 2031 extern bfd_boolean _bfd_elf_symbol_refs_local_p 2032 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2033 2034 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation 2035 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma); 2036 2037 extern bfd_boolean _bfd_elf_setup_sections 2038 (bfd *); 2039 2040 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *); 2041 2042 extern const bfd_target *bfd_elf32_object_p 2043 (bfd *); 2044 extern const bfd_target *bfd_elf32_core_file_p 2045 (bfd *); 2046 extern char *bfd_elf32_core_file_failing_command 2047 (bfd *); 2048 extern int bfd_elf32_core_file_failing_signal 2049 (bfd *); 2050 extern bfd_boolean bfd_elf32_core_file_matches_executable_p 2051 (bfd *, bfd *); 2052 extern int bfd_elf32_core_file_pid 2053 (bfd *); 2054 2055 extern bfd_boolean bfd_elf32_swap_symbol_in 2056 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2057 extern void bfd_elf32_swap_symbol_out 2058 (bfd *, const Elf_Internal_Sym *, void *, void *); 2059 extern void bfd_elf32_swap_reloc_in 2060 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2061 extern void bfd_elf32_swap_reloc_out 2062 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2063 extern void bfd_elf32_swap_reloca_in 2064 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2065 extern void bfd_elf32_swap_reloca_out 2066 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2067 extern void bfd_elf32_swap_phdr_in 2068 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *); 2069 extern void bfd_elf32_swap_phdr_out 2070 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *); 2071 extern void bfd_elf32_swap_dyn_in 2072 (bfd *, const void *, Elf_Internal_Dyn *); 2073 extern void bfd_elf32_swap_dyn_out 2074 (bfd *, const Elf_Internal_Dyn *, void *); 2075 extern long bfd_elf32_slurp_symbol_table 2076 (bfd *, asymbol **, bfd_boolean); 2077 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr 2078 (bfd *); 2079 extern int bfd_elf32_write_out_phdrs 2080 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2081 extern bfd_boolean bfd_elf32_checksum_contents 2082 (bfd * , void (*) (const void *, size_t, void *), void *); 2083 extern void bfd_elf32_write_relocs 2084 (bfd *, asection *, void *); 2085 extern bfd_boolean bfd_elf32_slurp_reloc_table 2086 (bfd *, asection *, asymbol **, bfd_boolean); 2087 2088 extern const bfd_target *bfd_elf64_object_p 2089 (bfd *); 2090 extern const bfd_target *bfd_elf64_core_file_p 2091 (bfd *); 2092 extern char *bfd_elf64_core_file_failing_command 2093 (bfd *); 2094 extern int bfd_elf64_core_file_failing_signal 2095 (bfd *); 2096 extern bfd_boolean bfd_elf64_core_file_matches_executable_p 2097 (bfd *, bfd *); 2098 extern int bfd_elf64_core_file_pid 2099 (bfd *); 2100 2101 extern bfd_boolean bfd_elf64_swap_symbol_in 2102 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2103 extern void bfd_elf64_swap_symbol_out 2104 (bfd *, const Elf_Internal_Sym *, void *, void *); 2105 extern void bfd_elf64_swap_reloc_in 2106 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2107 extern void bfd_elf64_swap_reloc_out 2108 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2109 extern void bfd_elf64_swap_reloca_in 2110 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2111 extern void bfd_elf64_swap_reloca_out 2112 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2113 extern void bfd_elf64_swap_phdr_in 2114 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *); 2115 extern void bfd_elf64_swap_phdr_out 2116 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *); 2117 extern void bfd_elf64_swap_dyn_in 2118 (bfd *, const void *, Elf_Internal_Dyn *); 2119 extern void bfd_elf64_swap_dyn_out 2120 (bfd *, const Elf_Internal_Dyn *, void *); 2121 extern long bfd_elf64_slurp_symbol_table 2122 (bfd *, asymbol **, bfd_boolean); 2123 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr 2124 (bfd *); 2125 extern int bfd_elf64_write_out_phdrs 2126 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2127 extern bfd_boolean bfd_elf64_checksum_contents 2128 (bfd * , void (*) (const void *, size_t, void *), void *); 2129 extern void bfd_elf64_write_relocs 2130 (bfd *, asection *, void *); 2131 extern bfd_boolean bfd_elf64_slurp_reloc_table 2132 (bfd *, asection *, asymbol **, bfd_boolean); 2133 2134 extern bfd_boolean _bfd_elf_default_relocs_compatible 2135 (const bfd_target *, const bfd_target *); 2136 2137 extern bfd_boolean _bfd_elf_relocs_compatible 2138 (const bfd_target *, const bfd_target *); 2139 extern bfd_boolean _bfd_elf_notice_as_needed 2140 (bfd *, struct bfd_link_info *, enum notice_asneeded_action); 2141 2142 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup 2143 (bfd *, struct bfd_link_info *, const char *); 2144 extern bfd_boolean bfd_elf_link_add_symbols 2145 (bfd *, struct bfd_link_info *); 2146 extern bfd_boolean _bfd_elf_add_dynamic_entry 2147 (struct bfd_link_info *, bfd_vma, bfd_vma); 2148 2149 extern bfd_boolean bfd_elf_link_record_dynamic_symbol 2150 (struct bfd_link_info *, struct elf_link_hash_entry *); 2151 2152 extern int bfd_elf_link_record_local_dynamic_symbol 2153 (struct bfd_link_info *, bfd *, long); 2154 2155 extern bfd_boolean _bfd_elf_close_and_cleanup 2156 (bfd *); 2157 2158 extern bfd_boolean _bfd_elf_common_definition 2159 (Elf_Internal_Sym *); 2160 2161 extern unsigned int _bfd_elf_common_section_index 2162 (asection *); 2163 2164 extern asection *_bfd_elf_common_section 2165 (asection *); 2166 2167 extern bfd_vma _bfd_elf_default_got_elt_size 2168 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *, 2169 unsigned long); 2170 2171 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn 2172 (bfd *, arelent *, struct bfd_symbol *, void *, 2173 asection *, bfd *, char **); 2174 2175 extern bfd_boolean bfd_elf_final_link 2176 (bfd *, struct bfd_link_info *); 2177 2178 extern void _bfd_elf_gc_keep 2179 (struct bfd_link_info *info); 2180 2181 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol 2182 (struct elf_link_hash_entry *h, void *inf); 2183 2184 extern bfd_boolean bfd_elf_gc_sections 2185 (bfd *, struct bfd_link_info *); 2186 2187 extern bfd_boolean bfd_elf_gc_record_vtinherit 2188 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2189 2190 extern bfd_boolean bfd_elf_gc_record_vtentry 2191 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2192 2193 extern asection *_bfd_elf_gc_mark_hook 2194 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 2195 struct elf_link_hash_entry *, Elf_Internal_Sym *); 2196 2197 extern asection *_bfd_elf_gc_mark_rsec 2198 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2199 struct elf_reloc_cookie *); 2200 2201 extern bfd_boolean _bfd_elf_gc_mark_reloc 2202 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2203 struct elf_reloc_cookie *); 2204 2205 extern bfd_boolean _bfd_elf_gc_mark_fdes 2206 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn, 2207 struct elf_reloc_cookie *); 2208 2209 extern bfd_boolean _bfd_elf_gc_mark 2210 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn); 2211 2212 extern bfd_boolean _bfd_elf_gc_mark_extra_sections 2213 (struct bfd_link_info *, elf_gc_mark_hook_fn); 2214 2215 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets 2216 (bfd *, struct bfd_link_info *); 2217 2218 extern bfd_boolean bfd_elf_gc_common_final_link 2219 (bfd *, struct bfd_link_info *); 2220 2221 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p 2222 (bfd_vma, void *); 2223 2224 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment 2225 (bfd *, asection *); 2226 2227 extern bfd_boolean _bfd_elf_map_sections_to_segments 2228 (bfd *, struct bfd_link_info *); 2229 2230 extern bfd_boolean _bfd_elf_is_function_type (unsigned int); 2231 2232 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *, 2233 bfd_vma *); 2234 2235 extern int bfd_elf_get_default_section_type (flagword); 2236 2237 extern bfd_boolean bfd_elf_lookup_section_flags 2238 (struct bfd_link_info *, struct flag_info *, asection *); 2239 2240 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section 2241 (bfd * abfd, asection * section); 2242 2243 /* Exported interface for writing elf corefile notes. */ 2244 extern char *elfcore_write_note 2245 (bfd *, char *, int *, const char *, int, const void *, int); 2246 extern char *elfcore_write_prpsinfo 2247 (bfd *, char *, int *, const char *, const char *); 2248 extern char *elfcore_write_prstatus 2249 (bfd *, char *, int *, long, int, const void *); 2250 extern char * elfcore_write_pstatus 2251 (bfd *, char *, int *, long, int, const void *); 2252 extern char *elfcore_write_prfpreg 2253 (bfd *, char *, int *, const void *, int); 2254 extern char *elfcore_write_prxfpreg 2255 (bfd *, char *, int *, const void *, int); 2256 extern char *elfcore_write_xstatereg 2257 (bfd *, char *, int *, const void *, int); 2258 extern char *elfcore_write_ppc_vmx 2259 (bfd *, char *, int *, const void *, int); 2260 extern char *elfcore_write_ppc_vsx 2261 (bfd *, char *, int *, const void *, int); 2262 extern char *elfcore_write_s390_timer 2263 (bfd *, char *, int *, const void *, int); 2264 extern char *elfcore_write_s390_todcmp 2265 (bfd *, char *, int *, const void *, int); 2266 extern char *elfcore_write_s390_todpreg 2267 (bfd *, char *, int *, const void *, int); 2268 extern char *elfcore_write_s390_ctrs 2269 (bfd *, char *, int *, const void *, int); 2270 extern char *elfcore_write_s390_prefix 2271 (bfd *, char *, int *, const void *, int); 2272 extern char *elfcore_write_s390_last_break 2273 (bfd *, char *, int *, const void *, int); 2274 extern char *elfcore_write_s390_system_call 2275 (bfd *, char *, int *, const void *, int); 2276 extern char *elfcore_write_s390_tdb 2277 (bfd *, char *, int *, const void *, int); 2278 extern char *elfcore_write_arm_vfp 2279 (bfd *, char *, int *, const void *, int); 2280 extern char *elfcore_write_aarch_tls 2281 (bfd *, char *, int *, const void *, int); 2282 extern char *elfcore_write_aarch_hw_break 2283 (bfd *, char *, int *, const void *, int); 2284 extern char *elfcore_write_aarch_hw_watch 2285 (bfd *, char *, int *, const void *, int); 2286 extern char *elfcore_write_lwpstatus 2287 (bfd *, char *, int *, long, int, const void *); 2288 extern char *elfcore_write_register_note 2289 (bfd *, char *, int *, const char *, const void *, int); 2290 2291 /* Internal structure which holds information to be included in the 2292 PRPSINFO section of Linux core files. 2293 2294 This is an "internal" structure in the sense that it should be used 2295 to pass information to BFD (via the `elfcore_write_linux_prpsinfo' 2296 function), so things like endianess shouldn't be an issue. This 2297 structure will eventually be converted in one of the 2298 `elf_external_linux_*' structures and written out to an output bfd 2299 by one of the functions declared below. */ 2300 2301 struct elf_internal_linux_prpsinfo 2302 { 2303 char pr_state; /* Numeric process state. */ 2304 char pr_sname; /* Char for pr_state. */ 2305 char pr_zomb; /* Zombie. */ 2306 char pr_nice; /* Nice val. */ 2307 unsigned long pr_flag; /* Flags. */ 2308 unsigned int pr_uid; 2309 unsigned int pr_gid; 2310 int pr_pid, pr_ppid, pr_pgrp, pr_sid; 2311 char pr_fname[16 + 1]; /* Filename of executable. */ 2312 char pr_psargs[80 + 1]; /* Initial part of arg list. */ 2313 }; 2314 2315 /* Linux/most 32-bit archs. */ 2316 extern char *elfcore_write_linux_prpsinfo32 2317 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2318 2319 /* Linux/most 64-bit archs. */ 2320 extern char *elfcore_write_linux_prpsinfo64 2321 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2322 2323 /* Linux/PPC32 uses different layout compared to most archs. */ 2324 extern char *elfcore_write_ppc_linux_prpsinfo32 2325 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2326 2327 extern bfd *_bfd_elf32_bfd_from_remote_memory 2328 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2329 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2330 extern bfd *_bfd_elf64_bfd_from_remote_memory 2331 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2332 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2333 2334 extern bfd_vma bfd_elf_obj_attr_size (bfd *); 2335 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma); 2336 extern int bfd_elf_get_obj_attr_int (bfd *, int, int); 2337 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int); 2338 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \ 2339 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2340 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *); 2341 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \ 2342 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2343 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int, 2344 const char *); 2345 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \ 2346 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \ 2347 (INTVAL), (STRVAL)) 2348 2349 extern char *_bfd_elf_attr_strdup (bfd *, const char *); 2350 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *); 2351 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int); 2352 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *); 2353 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *); 2354 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int); 2355 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *); 2356 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec); 2357 2358 /* The linker may need to keep track of the number of relocs that it 2359 decides to copy as dynamic relocs in check_relocs for each symbol. 2360 This is so that it can later discard them if they are found to be 2361 unnecessary. We can store the information in a field extending the 2362 regular ELF linker hash table. */ 2363 2364 struct elf_dyn_relocs 2365 { 2366 struct elf_dyn_relocs *next; 2367 2368 /* The input section of the reloc. */ 2369 asection *sec; 2370 2371 /* Total number of relocs copied for the input section. */ 2372 bfd_size_type count; 2373 2374 /* Number of pc-relative relocs copied for the input section. */ 2375 bfd_size_type pc_count; 2376 }; 2377 2378 extern bfd_boolean _bfd_elf_create_ifunc_sections 2379 (bfd *, struct bfd_link_info *); 2380 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs 2381 (struct bfd_link_info *, struct elf_link_hash_entry *, 2382 struct elf_dyn_relocs **, unsigned int, unsigned int, unsigned int); 2383 2384 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *); 2385 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *); 2386 2387 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma); 2388 extern bfd_vma elf64_r_sym (bfd_vma); 2389 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma); 2390 extern bfd_vma elf32_r_sym (bfd_vma); 2391 2392 /* Large common section. */ 2393 extern asection _bfd_elf_large_com_section; 2394 2395 /* Hash for local symbol with the first section id, ID, in the input 2396 file and the local symbol index, SYM. */ 2397 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \ 2398 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \ 2399 ^ (SYM) ^ ((ID) >> 16)) 2400 2401 /* This is the condition under which finish_dynamic_symbol will be called. 2402 If our finish_dynamic_symbol isn't called, we'll need to do something 2403 about initializing any .plt and .got entries in relocate_section. */ 2404 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ 2405 ((DYN) \ 2406 && ((SHARED) || !(H)->forced_local) \ 2407 && ((H)->dynindx != -1 || (H)->forced_local)) 2408 2409 /* This macro is to avoid lots of duplicated code in the body 2410 of xxx_relocate_section() in the various elfxx-xxxx.c files. */ 2411 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \ 2412 r_symndx, symtab_hdr, sym_hashes, \ 2413 h, sec, relocation, \ 2414 unresolved_reloc, warned, ignored) \ 2415 do \ 2416 { \ 2417 /* It seems this can happen with erroneous or unsupported \ 2418 input (mixing a.out and elf in an archive, for example.) */ \ 2419 if (sym_hashes == NULL) \ 2420 return FALSE; \ 2421 \ 2422 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \ 2423 \ 2424 if (info->wrap_hash != NULL \ 2425 && (input_section->flags & SEC_DEBUGGING) != 0) \ 2426 h = ((struct elf_link_hash_entry *) \ 2427 unwrap_hash_lookup (info, input_bfd, &h->root)); \ 2428 \ 2429 while (h->root.type == bfd_link_hash_indirect \ 2430 || h->root.type == bfd_link_hash_warning) \ 2431 h = (struct elf_link_hash_entry *) h->root.u.i.link; \ 2432 \ 2433 warned = FALSE; \ 2434 ignored = FALSE; \ 2435 unresolved_reloc = FALSE; \ 2436 relocation = 0; \ 2437 if (h->root.type == bfd_link_hash_defined \ 2438 || h->root.type == bfd_link_hash_defweak) \ 2439 { \ 2440 sec = h->root.u.def.section; \ 2441 if (sec == NULL \ 2442 || sec->output_section == NULL) \ 2443 /* Set a flag that will be cleared later if we find a \ 2444 relocation value for this symbol. output_section \ 2445 is typically NULL for symbols satisfied by a shared \ 2446 library. */ \ 2447 unresolved_reloc = TRUE; \ 2448 else \ 2449 relocation = (h->root.u.def.value \ 2450 + sec->output_section->vma \ 2451 + sec->output_offset); \ 2452 } \ 2453 else if (h->root.type == bfd_link_hash_undefweak) \ 2454 ; \ 2455 else if (info->unresolved_syms_in_objects == RM_IGNORE \ 2456 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \ 2457 ignored = TRUE; \ 2458 else if (!info->relocatable) \ 2459 { \ 2460 bfd_boolean err; \ 2461 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \ 2462 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \ 2463 if (!info->callbacks->undefined_symbol (info, \ 2464 h->root.root.string, \ 2465 input_bfd, \ 2466 input_section, \ 2467 rel->r_offset, err)) \ 2468 return FALSE; \ 2469 warned = TRUE; \ 2470 } \ 2471 (void) unresolved_reloc; \ 2472 (void) warned; \ 2473 (void) ignored; \ 2474 } \ 2475 while (0) 2476 2477 /* This macro is to avoid lots of duplicated code in the body of the 2478 loop over relocations in xxx_relocate_section() in the various 2479 elfxx-xxxx.c files. 2480 2481 Handle relocations against symbols from removed linkonce sections, 2482 or sections discarded by a linker script. When doing a relocatable 2483 link, we remove such relocations. Otherwise, we just want the 2484 section contents zeroed and avoid any special processing. */ 2485 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \ 2486 rel, count, relend, \ 2487 howto, index, contents) \ 2488 { \ 2489 int i_; \ 2490 _bfd_clear_contents (howto, input_bfd, input_section, \ 2491 contents + rel[index].r_offset); \ 2492 \ 2493 if (info->relocatable \ 2494 && (input_section->flags & SEC_DEBUGGING)) \ 2495 { \ 2496 /* Only remove relocations in debug sections since other \ 2497 sections may require relocations. */ \ 2498 Elf_Internal_Shdr *rel_hdr; \ 2499 \ 2500 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \ 2501 \ 2502 /* Avoid empty output section. */ \ 2503 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \ 2504 { \ 2505 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2506 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \ 2507 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2508 \ 2509 memmove (rel, rel + count, \ 2510 (relend - rel - count) * sizeof (*rel)); \ 2511 \ 2512 input_section->reloc_count--; \ 2513 relend -= count; \ 2514 rel--; \ 2515 continue; \ 2516 } \ 2517 } \ 2518 \ 2519 for (i_ = 0; i_ < count; i_++) \ 2520 { \ 2521 rel[i_].r_info = 0; \ 2522 rel[i_].r_addend = 0; \ 2523 } \ 2524 rel += count - 1; \ 2525 continue; \ 2526 } 2527 2528 /* Will a symbol be bound to the definition within the shared 2529 library, if any. A unique symbol can never be bound locally. */ 2530 #define SYMBOLIC_BIND(INFO, H) \ 2531 (!(H)->unique_global \ 2532 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))) 2533 2534 #endif /* _LIBELF_H_ */ 2535