1 /* BFD back-end data structures for ELF files. 2 Copyright 1992-2013 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; 83 struct got_entry; 84 struct plt_entry; 85 86 union gotplt_union 87 { 88 bfd_signed_vma refcount; 89 bfd_vma offset; 90 struct got_entry *glist; 91 struct plt_entry *plist; 92 }; 93 94 struct elf_link_virtual_table_entry 95 { 96 /* Virtual table entry use information. This array is nominally of size 97 size/sizeof(target_void_pointer), though we have to be able to assume 98 and track a size while the symbol is still undefined. It is indexed 99 via offset/sizeof(target_void_pointer). */ 100 size_t size; 101 bfd_boolean *used; 102 103 /* Virtual table derivation info. */ 104 struct elf_link_hash_entry *parent; 105 }; 106 107 /* ELF linker hash table entries. */ 108 109 struct elf_link_hash_entry 110 { 111 struct bfd_link_hash_entry root; 112 113 /* Symbol index in output file. This is initialized to -1. It is 114 set to -2 if the symbol is used by a reloc. */ 115 long indx; 116 117 /* Symbol index as a dynamic symbol. Initialized to -1, and remains 118 -1 if this is not a dynamic symbol. */ 119 /* ??? Note that this is consistently used as a synonym for tests 120 against whether we can perform various simplifying transformations 121 to the code. (E.g. changing a pc-relative jump to a PLT entry 122 into a pc-relative jump to the target function.) That test, which 123 is often relatively complex, and someplaces wrong or incomplete, 124 should really be replaced by a predicate in elflink.c. 125 126 End result: this field -1 does not indicate that the symbol is 127 not in the dynamic symbol table, but rather that the symbol is 128 not visible outside this DSO. */ 129 long dynindx; 130 131 /* If this symbol requires an entry in the global offset table, the 132 processor specific backend uses this field to track usage and 133 final offset. Two schemes are supported: The first assumes that 134 a symbol may only have one GOT entry, and uses REFCOUNT until 135 size_dynamic_sections, at which point the contents of the .got is 136 fixed. Afterward, if OFFSET is -1, then the symbol does not 137 require a global offset table entry. The second scheme allows 138 multiple GOT entries per symbol, managed via a linked list 139 pointed to by GLIST. */ 140 union gotplt_union got; 141 142 /* Same, but tracks a procedure linkage table entry. */ 143 union gotplt_union plt; 144 145 /* Symbol size. */ 146 bfd_size_type size; 147 148 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */ 149 unsigned int type : 8; 150 151 /* Symbol st_other value, symbol visibility. */ 152 unsigned int other : 8; 153 154 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */ 155 unsigned int target_internal : 8; 156 157 /* Symbol is referenced by a non-shared object (other than the object 158 in which it is defined). */ 159 unsigned int ref_regular : 1; 160 /* Symbol is defined by a non-shared object. */ 161 unsigned int def_regular : 1; 162 /* Symbol is referenced by a shared object. */ 163 unsigned int ref_dynamic : 1; 164 /* Symbol is defined by a shared object. */ 165 unsigned int def_dynamic : 1; 166 /* Symbol has a non-weak reference from a non-shared object (other than 167 the object in which it is defined). */ 168 unsigned int ref_regular_nonweak : 1; 169 /* Dynamic symbol has been adjustd. */ 170 unsigned int dynamic_adjusted : 1; 171 /* Symbol needs a copy reloc. */ 172 unsigned int needs_copy : 1; 173 /* Symbol needs a procedure linkage table entry. */ 174 unsigned int needs_plt : 1; 175 /* Symbol appears in a non-ELF input file. */ 176 unsigned int non_elf : 1; 177 /* Symbol should be marked as hidden in the version information. */ 178 unsigned int hidden : 1; 179 /* Symbol was forced to local scope due to a version script file. */ 180 unsigned int forced_local : 1; 181 /* Symbol was forced to be dynamic due to a version script file. */ 182 unsigned int dynamic : 1; 183 /* Symbol was marked during garbage collection. */ 184 unsigned int mark : 1; 185 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is 186 not currently set by all the backends. */ 187 unsigned int non_got_ref : 1; 188 /* Symbol has a definition in a shared object. 189 FIXME: There is no real need for this field if def_dynamic is never 190 cleared and all places that test def_dynamic also test def_regular. */ 191 unsigned int dynamic_def : 1; 192 /* Symbol has a non-weak reference from a shared object. */ 193 unsigned int ref_dynamic_nonweak : 1; 194 /* Symbol is referenced with a relocation where C/C++ pointer equality 195 matters. */ 196 unsigned int pointer_equality_needed : 1; 197 /* Symbol is a unique global symbol. */ 198 unsigned int unique_global : 1; 199 200 /* String table index in .dynstr if this is a dynamic symbol. */ 201 unsigned long dynstr_index; 202 203 union 204 { 205 /* If this is a weak defined symbol from a dynamic object, this 206 field points to a defined symbol with the same value, if there is 207 one. Otherwise it is NULL. */ 208 struct elf_link_hash_entry *weakdef; 209 210 /* Hash value of the name computed using the ELF hash function. 211 Used part way through size_dynamic_sections, after we've finished 212 with weakdefs. */ 213 unsigned long elf_hash_value; 214 } u; 215 216 /* Version information. */ 217 union 218 { 219 /* This field is used for a symbol which is not defined in a 220 regular object. It points to the version information read in 221 from the dynamic object. */ 222 Elf_Internal_Verdef *verdef; 223 /* This field is used for a symbol which is defined in a regular 224 object. It is set up in size_dynamic_sections. It points to 225 the version information we should write out for this symbol. */ 226 struct bfd_elf_version_tree *vertree; 227 } verinfo; 228 229 struct elf_link_virtual_table_entry *vtable; 230 }; 231 232 /* Will references to this symbol always reference the symbol 233 in this object? */ 234 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \ 235 _bfd_elf_symbol_refs_local_p (H, INFO, 0) 236 237 /* Will _calls_ to this symbol always call the version in this object? */ 238 #define SYMBOL_CALLS_LOCAL(INFO, H) \ 239 _bfd_elf_symbol_refs_local_p (H, INFO, 1) 240 241 /* Common symbols that are turned into definitions don't have the 242 DEF_REGULAR flag set, so they might appear to be undefined. */ 243 #define ELF_COMMON_DEF_P(H) \ 244 (!(H)->def_regular \ 245 && !(H)->def_dynamic \ 246 && (H)->root.type == bfd_link_hash_defined) 247 248 /* Records local symbols to be emitted in the dynamic symbol table. */ 249 250 struct elf_link_local_dynamic_entry 251 { 252 struct elf_link_local_dynamic_entry *next; 253 254 /* The input bfd this symbol came from. */ 255 bfd *input_bfd; 256 257 /* The index of the local symbol being copied. */ 258 long input_indx; 259 260 /* The index in the outgoing dynamic symbol table. */ 261 long dynindx; 262 263 /* A copy of the input symbol. */ 264 Elf_Internal_Sym isym; 265 }; 266 267 struct elf_link_loaded_list 268 { 269 struct elf_link_loaded_list *next; 270 bfd *abfd; 271 }; 272 273 /* Structures used by the eh_frame optimization code. */ 274 struct eh_cie_fde 275 { 276 union { 277 struct { 278 /* If REMOVED == 1, this is the CIE that the FDE originally used. 279 The CIE belongs to the same .eh_frame input section as the FDE. 280 281 If REMOVED == 0, this is the CIE that we have chosen to use for 282 the output FDE. The CIE's REMOVED field is also 0, but the CIE 283 might belong to a different .eh_frame input section from the FDE. */ 284 struct eh_cie_fde *cie_inf; 285 struct eh_cie_fde *next_for_section; 286 } fde; 287 struct { 288 /* CIEs have three states: 289 290 - REMOVED && !MERGED: Slated for removal because we haven't yet 291 proven that an FDE needs it. FULL_CIE, if nonnull, points to 292 more detailed information about the CIE. 293 294 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH, 295 which may not belong to the same input section. 296 297 - !REMOVED: We have decided to keep this CIE. SEC is the 298 .eh_frame input section that contains the CIE. */ 299 union { 300 struct cie *full_cie; 301 struct eh_cie_fde *merged_with; 302 asection *sec; 303 } u; 304 305 /* The offset of the personality data from the start of the CIE, 306 or 0 if the CIE doesn't have any. */ 307 unsigned int personality_offset : 8; 308 309 /* True if we have marked relocations associated with this CIE. */ 310 unsigned int gc_mark : 1; 311 312 /* True if we have decided to turn an absolute LSDA encoding into 313 a PC-relative one. */ 314 unsigned int make_lsda_relative : 1; 315 316 /* True if we have decided to turn an absolute personality 317 encoding into a PC-relative one. */ 318 unsigned int make_per_encoding_relative : 1; 319 320 /* True if the CIE contains personality data and if that 321 data uses a PC-relative encoding. Always true when 322 make_per_encoding_relative is. */ 323 unsigned int per_encoding_relative : 1; 324 325 /* True if we need to add an 'R' (FDE encoding) entry to the 326 CIE's augmentation data. */ 327 unsigned int add_fde_encoding : 1; 328 329 /* True if we have merged this CIE with another. */ 330 unsigned int merged : 1; 331 332 /* Unused bits. */ 333 unsigned int pad1 : 18; 334 } cie; 335 } u; 336 unsigned int reloc_index; 337 unsigned int size; 338 unsigned int offset; 339 unsigned int new_offset; 340 unsigned int fde_encoding : 8; 341 unsigned int lsda_encoding : 8; 342 unsigned int lsda_offset : 8; 343 344 /* True if this entry represents a CIE, false if it represents an FDE. */ 345 unsigned int cie : 1; 346 347 /* True if this entry is currently marked for removal. */ 348 unsigned int removed : 1; 349 350 /* True if we need to add a 'z' (augmentation size) entry to the CIE's 351 augmentation data, and an associated byte to each of the CIE's FDEs. */ 352 unsigned int add_augmentation_size : 1; 353 354 /* True if we have decided to convert absolute FDE relocations into 355 relative ones. This applies to the first relocation in the FDE, 356 which is against the code that the FDE describes. */ 357 unsigned int make_relative : 1; 358 359 /* Unused bits. */ 360 unsigned int pad1 : 4; 361 362 unsigned int *set_loc; 363 }; 364 365 struct eh_frame_sec_info 366 { 367 unsigned int count; 368 struct cie *cies; 369 struct eh_cie_fde entry[1]; 370 }; 371 372 struct eh_frame_array_ent 373 { 374 bfd_vma initial_loc; 375 bfd_vma fde; 376 }; 377 378 struct htab; 379 380 struct eh_frame_hdr_info 381 { 382 struct htab *cies; 383 asection *hdr_sec; 384 unsigned int fde_count, array_count; 385 struct eh_frame_array_ent *array; 386 /* TRUE if we should try to merge CIEs between input sections. */ 387 bfd_boolean merge_cies; 388 /* TRUE if all .eh_frames have been parsd. */ 389 bfd_boolean parsed_eh_frames; 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 NIOS2_ELF_DATA, 423 PPC32_ELF_DATA, 424 PPC64_ELF_DATA, 425 S390_ELF_DATA, 426 SH_ELF_DATA, 427 SPARC_ELF_DATA, 428 SPU_ELF_DATA, 429 TIC6X_ELF_DATA, 430 X86_64_ELF_DATA, 431 XTENSA_ELF_DATA, 432 XGATE_ELF_DATA, 433 TILEGX_ELF_DATA, 434 TILEPRO_ELF_DATA, 435 GENERIC_ELF_DATA 436 }; 437 438 /* ELF linker hash table. */ 439 440 struct elf_link_hash_table 441 { 442 struct bfd_link_hash_table root; 443 444 /* An identifier used to distinguish different target 445 specific extensions to this structure. */ 446 enum elf_target_id hash_table_id; 447 448 /* Whether we have created the special dynamic sections required 449 when linking against or generating a shared object. */ 450 bfd_boolean dynamic_sections_created; 451 452 /* True if this target has relocatable executables, so needs dynamic 453 section symbols. */ 454 bfd_boolean is_relocatable_executable; 455 456 /* The BFD used to hold special sections created by the linker. 457 This will be the first BFD found which requires these sections to 458 be created. */ 459 bfd *dynobj; 460 461 /* The value to use when initialising got.refcount/offset and 462 plt.refcount/offset in an elf_link_hash_entry. Set to zero when 463 the values are refcounts. Set to init_got_offset/init_plt_offset 464 in size_dynamic_sections when the values may be offsets. */ 465 union gotplt_union init_got_refcount; 466 union gotplt_union init_plt_refcount; 467 468 /* The value to use for got.refcount/offset and plt.refcount/offset 469 when the values may be offsets. Normally (bfd_vma) -1. */ 470 union gotplt_union init_got_offset; 471 union gotplt_union init_plt_offset; 472 473 /* The number of symbols found in the link which must be put into 474 the .dynsym section. */ 475 bfd_size_type dynsymcount; 476 477 /* The string table of dynamic symbols, which becomes the .dynstr 478 section. */ 479 struct elf_strtab_hash *dynstr; 480 481 /* The number of buckets in the hash table in the .hash section. 482 This is based on the number of dynamic symbols. */ 483 bfd_size_type bucketcount; 484 485 /* A linked list of DT_NEEDED names found in dynamic objects 486 included in the link. */ 487 struct bfd_link_needed_list *needed; 488 489 /* Sections in the output bfd that provides a section symbol 490 to be used by relocations emitted against local symbols. 491 Most targets will not use data_index_section. */ 492 asection *text_index_section; 493 asection *data_index_section; 494 495 /* The _GLOBAL_OFFSET_TABLE_ symbol. */ 496 struct elf_link_hash_entry *hgot; 497 498 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */ 499 struct elf_link_hash_entry *hplt; 500 501 /* The _DYNAMIC symbol. */ 502 struct elf_link_hash_entry *hdynamic; 503 504 /* A pointer to information used to merge SEC_MERGE sections. */ 505 void *merge_info; 506 507 /* Used to link stabs in sections. */ 508 struct stab_info stab_info; 509 510 /* Used by eh_frame code when editing .eh_frame. */ 511 struct eh_frame_hdr_info eh_info; 512 513 /* A linked list of local symbols to be added to .dynsym. */ 514 struct elf_link_local_dynamic_entry *dynlocal; 515 516 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic 517 objects included in the link. */ 518 struct bfd_link_needed_list *runpath; 519 520 /* Cached first output tls section and size of PT_TLS segment. */ 521 asection *tls_sec; 522 bfd_size_type tls_size; 523 524 /* A linked list of BFD's loaded in the link. */ 525 struct elf_link_loaded_list *loaded; 526 527 /* Short-cuts to get to dynamic linker sections. */ 528 asection *sgot; 529 asection *sgotplt; 530 asection *srelgot; 531 asection *splt; 532 asection *srelplt; 533 asection *igotplt; 534 asection *iplt; 535 asection *irelplt; 536 asection *irelifunc; 537 }; 538 539 /* Look up an entry in an ELF linker hash table. */ 540 541 #define elf_link_hash_lookup(table, string, create, copy, follow) \ 542 ((struct elf_link_hash_entry *) \ 543 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 544 (copy), (follow))) 545 546 /* Traverse an ELF linker hash table. */ 547 548 #define elf_link_hash_traverse(table, func, info) \ 549 (bfd_link_hash_traverse \ 550 (&(table)->root, \ 551 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 552 (info))) 553 554 /* Get the ELF linker hash table from a link_info structure. */ 555 556 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash)) 557 558 #define elf_hash_table_id(table) ((table) -> hash_table_id) 559 560 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */ 561 #define is_elf_hash_table(htab) \ 562 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table) 563 564 /* Used by bfd_sym_from_r_symndx to cache a small number of local 565 symbols. */ 566 #define LOCAL_SYM_CACHE_SIZE 32 567 struct sym_cache 568 { 569 bfd *abfd; 570 unsigned long indx[LOCAL_SYM_CACHE_SIZE]; 571 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE]; 572 }; 573 574 /* Constant information held for an ELF backend. */ 575 576 struct elf_size_info { 577 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr; 578 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note; 579 580 /* The size of entries in the .hash section. */ 581 unsigned char sizeof_hash_entry; 582 583 /* The number of internal relocations to allocate per external 584 relocation entry. */ 585 unsigned char int_rels_per_ext_rel; 586 /* We use some fixed size arrays. This should be large enough to 587 handle all back-ends. */ 588 #define MAX_INT_RELS_PER_EXT_REL 3 589 590 unsigned char arch_size, log_file_align; 591 unsigned char elfclass, ev_current; 592 int (*write_out_phdrs) 593 (bfd *, const Elf_Internal_Phdr *, unsigned int); 594 bfd_boolean 595 (*write_shdrs_and_ehdr) (bfd *); 596 bfd_boolean (*checksum_contents) 597 (bfd * , void (*) (const void *, size_t, void *), void *); 598 void (*write_relocs) 599 (bfd *, asection *, void *); 600 bfd_boolean (*swap_symbol_in) 601 (bfd *, const void *, const void *, Elf_Internal_Sym *); 602 void (*swap_symbol_out) 603 (bfd *, const Elf_Internal_Sym *, void *, void *); 604 bfd_boolean (*slurp_reloc_table) 605 (bfd *, asection *, asymbol **, bfd_boolean); 606 long (*slurp_symbol_table) 607 (bfd *, asymbol **, bfd_boolean); 608 void (*swap_dyn_in) 609 (bfd *, const void *, Elf_Internal_Dyn *); 610 void (*swap_dyn_out) 611 (bfd *, const Elf_Internal_Dyn *, void *); 612 613 /* This function is called to swap in a REL relocation. If an 614 external relocation corresponds to more than one internal 615 relocation, then all relocations are swapped in at once. */ 616 void (*swap_reloc_in) 617 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 618 619 /* This function is called to swap out a REL relocation. */ 620 void (*swap_reloc_out) 621 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 622 623 /* This function is called to swap in a RELA relocation. If an 624 external relocation corresponds to more than one internal 625 relocation, then all relocations are swapped in at once. */ 626 void (*swap_reloca_in) 627 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 628 629 /* This function is called to swap out a RELA relocation. */ 630 void (*swap_reloca_out) 631 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 632 }; 633 634 #define elf_symbol_from(ABFD,S) \ 635 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \ 636 && (S)->the_bfd->tdata.elf_obj_data != 0) \ 637 ? (elf_symbol_type *) (S) \ 638 : 0) 639 640 enum elf_reloc_type_class { 641 reloc_class_normal, 642 reloc_class_relative, 643 reloc_class_plt, 644 reloc_class_copy 645 }; 646 647 struct elf_reloc_cookie 648 { 649 Elf_Internal_Rela *rels, *rel, *relend; 650 Elf_Internal_Sym *locsyms; 651 bfd *abfd; 652 size_t locsymcount; 653 size_t extsymoff; 654 struct elf_link_hash_entry **sym_hashes; 655 int r_sym_shift; 656 bfd_boolean bad_symtab; 657 }; 658 659 /* The level of IRIX compatibility we're striving for. */ 660 661 typedef enum { 662 ict_none, 663 ict_irix5, 664 ict_irix6 665 } irix_compat_t; 666 667 /* Mapping of ELF section names and types. */ 668 struct bfd_elf_special_section 669 { 670 const char *prefix; 671 int prefix_length; 672 /* 0 means name must match PREFIX exactly. 673 -1 means name must start with PREFIX followed by an arbitrary string. 674 -2 means name must match PREFIX exactly or consist of PREFIX followed 675 by a dot then anything. 676 > 0 means name must start with the first PREFIX_LENGTH chars of 677 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */ 678 int suffix_length; 679 int type; 680 bfd_vma attr; 681 }; 682 683 enum action_discarded 684 { 685 COMPLAIN = 1, 686 PRETEND = 2 687 }; 688 689 typedef asection * (*elf_gc_mark_hook_fn) 690 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 691 struct elf_link_hash_entry *, Elf_Internal_Sym *); 692 693 struct elf_backend_data 694 { 695 /* The architecture for this backend. */ 696 enum bfd_architecture arch; 697 698 /* An identifier used to distinguish different target specific 699 extensions to elf_obj_tdata and elf_link_hash_table structures. */ 700 enum elf_target_id target_id; 701 702 /* The ELF machine code (EM_xxxx) for this backend. */ 703 int elf_machine_code; 704 705 /* EI_OSABI. */ 706 int elf_osabi; 707 708 /* The maximum page size for this backend. */ 709 bfd_vma maxpagesize; 710 711 /* The minimum page size for this backend. An input object will not be 712 considered page aligned unless its sections are correctly aligned for 713 pages at least this large. May be smaller than maxpagesize. */ 714 bfd_vma minpagesize; 715 716 /* The common page size for this backend. */ 717 bfd_vma commonpagesize; 718 719 /* The BFD flags applied to sections created for dynamic linking. */ 720 flagword dynamic_sec_flags; 721 722 /* Architecture-specific data for this backend. 723 This is actually a pointer to some type like struct elf_ARCH_data. */ 724 const void *arch_data; 725 726 /* A function to translate an ELF RELA relocation to a BFD arelent 727 structure. */ 728 void (*elf_info_to_howto) 729 (bfd *, arelent *, Elf_Internal_Rela *); 730 731 /* A function to translate an ELF REL relocation to a BFD arelent 732 structure. */ 733 void (*elf_info_to_howto_rel) 734 (bfd *, arelent *, Elf_Internal_Rela *); 735 736 /* A function to determine whether a symbol is global when 737 partitioning the symbol table into local and global symbols. 738 This should be NULL for most targets, in which case the correct 739 thing will be done. MIPS ELF, at least on the Irix 5, has 740 special requirements. */ 741 bfd_boolean (*elf_backend_sym_is_global) 742 (bfd *, asymbol *); 743 744 /* The remaining functions are hooks which are called only if they 745 are not NULL. */ 746 747 /* A function to permit a backend specific check on whether a 748 particular BFD format is relevant for an object file, and to 749 permit the backend to set any global information it wishes. When 750 this is called elf_elfheader is set, but anything else should be 751 used with caution. If this returns FALSE, the check_format 752 routine will return a bfd_error_wrong_format error. */ 753 bfd_boolean (*elf_backend_object_p) 754 (bfd *); 755 756 /* A function to do additional symbol processing when reading the 757 ELF symbol table. This is where any processor-specific special 758 section indices are handled. */ 759 void (*elf_backend_symbol_processing) 760 (bfd *, asymbol *); 761 762 /* A function to do additional symbol processing after reading the 763 entire ELF symbol table. */ 764 bfd_boolean (*elf_backend_symbol_table_processing) 765 (bfd *, elf_symbol_type *, unsigned int); 766 767 /* A function to set the type of the info field. Processor-specific 768 types should be handled here. */ 769 int (*elf_backend_get_symbol_type) 770 (Elf_Internal_Sym *, int); 771 772 /* A function to return the linker hash table entry of a symbol that 773 might be satisfied by an archive symbol. */ 774 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup) 775 (bfd *, struct bfd_link_info *, const char *); 776 777 /* Return true if local section symbols should have a non-null st_name. 778 NULL implies false. */ 779 bfd_boolean (*elf_backend_name_local_section_symbols) 780 (bfd *); 781 782 /* A function to do additional processing on the ELF section header 783 just before writing it out. This is used to set the flags and 784 type fields for some sections, or to actually write out data for 785 unusual sections. */ 786 bfd_boolean (*elf_backend_section_processing) 787 (bfd *, Elf_Internal_Shdr *); 788 789 /* A function to handle unusual section types when creating BFD 790 sections from ELF sections. */ 791 bfd_boolean (*elf_backend_section_from_shdr) 792 (bfd *, Elf_Internal_Shdr *, const char *, int); 793 794 /* A function to convert machine dependent ELF section header flags to 795 BFD internal section header flags. */ 796 bfd_boolean (*elf_backend_section_flags) 797 (flagword *, const Elf_Internal_Shdr *); 798 799 /* A function that returns a struct containing ELF section flags and 800 type for the given BFD section. */ 801 const struct bfd_elf_special_section * (*get_sec_type_attr) 802 (bfd *, asection *); 803 804 /* A function to handle unusual program segment types when creating BFD 805 sections from ELF program segments. */ 806 bfd_boolean (*elf_backend_section_from_phdr) 807 (bfd *, Elf_Internal_Phdr *, int, const char *); 808 809 /* A function to set up the ELF section header for a BFD section in 810 preparation for writing it out. This is where the flags and type 811 fields are set for unusual sections. */ 812 bfd_boolean (*elf_backend_fake_sections) 813 (bfd *, Elf_Internal_Shdr *, asection *); 814 815 /* A function to get the ELF section index for a BFD section. If 816 this returns TRUE, the section was found. If it is a normal ELF 817 section, *RETVAL should be left unchanged. If it is not a normal 818 ELF section *RETVAL should be set to the SHN_xxxx index. */ 819 bfd_boolean (*elf_backend_section_from_bfd_section) 820 (bfd *, asection *, int *retval); 821 822 /* If this field is not NULL, it is called by the add_symbols phase 823 of a link just before adding a symbol to the global linker hash 824 table. It may modify any of the fields as it wishes. If *NAME 825 is set to NULL, the symbol will be skipped rather than being 826 added to the hash table. This function is responsible for 827 handling all processor dependent symbol bindings and section 828 indices, and must set at least *FLAGS and *SEC for each processor 829 dependent case; failure to do so will cause a link error. */ 830 bfd_boolean (*elf_add_symbol_hook) 831 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *, 832 const char **name, flagword *flags, asection **sec, bfd_vma *value); 833 834 /* If this field is not NULL, it is called by the elf_link_output_sym 835 phase of a link for each symbol which will appear in the object file. 836 On error, this function returns 0. 1 is returned when the symbol 837 should be output, 2 is returned when the symbol should be discarded. */ 838 int (*elf_backend_link_output_symbol_hook) 839 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *, 840 asection *, struct elf_link_hash_entry *); 841 842 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend 843 linker the first time it encounters a dynamic object in the link. 844 This function must create any sections required for dynamic 845 linking. The ABFD argument is a dynamic object. The .interp, 846 .dynamic, .dynsym, .dynstr, and .hash functions have already been 847 created, and this function may modify the section flags if 848 desired. This function will normally create the .got and .plt 849 sections, but different backends have different requirements. */ 850 bfd_boolean (*elf_backend_create_dynamic_sections) 851 (bfd *abfd, struct bfd_link_info *info); 852 853 /* When creating a shared library, determine whether to omit the 854 dynamic symbol for the section. */ 855 bfd_boolean (*elf_backend_omit_section_dynsym) 856 (bfd *output_bfd, struct bfd_link_info *info, asection *osec); 857 858 /* Return TRUE if relocations of targets are compatible to the extent 859 that CHECK_RELOCS will properly process them. PR 4424. */ 860 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *); 861 862 /* The CHECK_RELOCS function is called by the add_symbols phase of 863 the ELF backend linker. It is called once for each section with 864 relocs of an object file, just after the symbols for the object 865 file have been added to the global linker hash table. The 866 function must look through the relocs and do any special handling 867 required. This generally means allocating space in the global 868 offset table, and perhaps allocating space for a reloc. The 869 relocs are always passed as Rela structures; if the section 870 actually uses Rel structures, the r_addend field will always be 871 zero. */ 872 bfd_boolean (*check_relocs) 873 (bfd *abfd, struct bfd_link_info *info, asection *o, 874 const Elf_Internal_Rela *relocs); 875 876 /* The CHECK_DIRECTIVES function is called once per input file by 877 the add_symbols phase of the ELF backend linker. The function 878 must inspect the bfd and create any additional symbols according 879 to any custom directives in the bfd. */ 880 bfd_boolean (*check_directives) 881 (bfd *abfd, struct bfd_link_info *info); 882 883 /* The AS_NEEDED_CLEANUP function is called once per --as-needed 884 input file that was not needed by the add_symbols phase of the 885 ELF backend linker. The function must undo any target specific 886 changes in the symbol hash table. */ 887 bfd_boolean (*as_needed_cleanup) 888 (bfd *abfd, struct bfd_link_info *info); 889 890 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend 891 linker for every symbol which is defined by a dynamic object and 892 referenced by a regular object. This is called after all the 893 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS 894 function has been called. The hash table entry should be 895 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be 896 defined in a section from a dynamic object. Dynamic object 897 sections are not included in the final link, and this function is 898 responsible for changing the value to something which the rest of 899 the link can deal with. This will normally involve adding an 900 entry to the .plt or .got or some such section, and setting the 901 symbol to point to that. */ 902 bfd_boolean (*elf_backend_adjust_dynamic_symbol) 903 (struct bfd_link_info *info, struct elf_link_hash_entry *h); 904 905 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker 906 after all the linker input files have been seen but before the 907 section sizes have been set. This is called after 908 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */ 909 bfd_boolean (*elf_backend_always_size_sections) 910 (bfd *output_bfd, struct bfd_link_info *info); 911 912 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend 913 linker after all the linker input files have been seen but before 914 the sections sizes have been set. This is called after 915 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols. 916 It is only called when linking against a dynamic object. It must 917 set the sizes of the dynamic sections, and may fill in their 918 contents as well. The generic ELF linker can handle the .dynsym, 919 .dynstr and .hash sections. This function must handle the 920 .interp section and any sections created by the 921 CREATE_DYNAMIC_SECTIONS entry point. */ 922 bfd_boolean (*elf_backend_size_dynamic_sections) 923 (bfd *output_bfd, struct bfd_link_info *info); 924 925 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections 926 we keep to use as a base for relocs and symbols. */ 927 void (*elf_backend_init_index_section) 928 (bfd *output_bfd, struct bfd_link_info *info); 929 930 /* The RELOCATE_SECTION function is called by the ELF backend linker 931 to handle the relocations for a section. 932 933 The relocs are always passed as Rela structures; if the section 934 actually uses Rel structures, the r_addend field will always be 935 zero. 936 937 This function is responsible for adjust the section contents as 938 necessary, and (if using Rela relocs and generating a 939 relocatable output file) adjusting the reloc addend as 940 necessary. 941 942 This function does not have to worry about setting the reloc 943 address or the reloc symbol index. 944 945 LOCAL_SYMS is a pointer to the swapped in local symbols. 946 947 LOCAL_SECTIONS is an array giving the section in the input file 948 corresponding to the st_shndx field of each local symbol. 949 950 The global hash table entry for the global symbols can be found 951 via elf_sym_hashes (input_bfd). 952 953 When generating relocatable output, this function must handle 954 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 955 going to be the section symbol corresponding to the output 956 section, which means that the addend must be adjusted 957 accordingly. 958 959 Returns FALSE on error, TRUE on success, 2 if successful and 960 relocations should be written for this section. */ 961 int (*elf_backend_relocate_section) 962 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, 963 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, 964 Elf_Internal_Sym *local_syms, asection **local_sections); 965 966 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend 967 linker just before it writes a symbol out to the .dynsym section. 968 The processor backend may make any required adjustment to the 969 symbol. It may also take the opportunity to set contents of the 970 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on 971 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called 972 on those symbols which are defined by a dynamic object. */ 973 bfd_boolean (*elf_backend_finish_dynamic_symbol) 974 (bfd *output_bfd, struct bfd_link_info *info, 975 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym); 976 977 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend 978 linker just before it writes all the dynamic sections out to the 979 output file. The FINISH_DYNAMIC_SYMBOL will have been called on 980 all dynamic symbols. */ 981 bfd_boolean (*elf_backend_finish_dynamic_sections) 982 (bfd *output_bfd, struct bfd_link_info *info); 983 984 /* A function to do any beginning processing needed for the ELF file 985 before building the ELF headers and computing file positions. */ 986 void (*elf_backend_begin_write_processing) 987 (bfd *, struct bfd_link_info *); 988 989 /* A function to do any final processing needed for the ELF file 990 before writing it out. The LINKER argument is TRUE if this BFD 991 was created by the ELF backend linker. */ 992 void (*elf_backend_final_write_processing) 993 (bfd *, bfd_boolean linker); 994 995 /* This function is called by get_program_header_size. It should 996 return the number of additional program segments which this BFD 997 will need. It should return -1 on error. */ 998 int (*elf_backend_additional_program_headers) 999 (bfd *, struct bfd_link_info *); 1000 1001 /* This function is called to modify an existing segment map in a 1002 backend specific fashion. */ 1003 bfd_boolean (*elf_backend_modify_segment_map) 1004 (bfd *, struct bfd_link_info *); 1005 1006 /* This function is called to modify program headers just before 1007 they are written. */ 1008 bfd_boolean (*elf_backend_modify_program_headers) 1009 (bfd *, struct bfd_link_info *); 1010 1011 /* This function is called before section garbage collection to 1012 mark entry symbol sections. */ 1013 void (*gc_keep) 1014 (struct bfd_link_info *); 1015 1016 /* This function is called during section garbage collection to 1017 mark sections that define global symbols. */ 1018 bfd_boolean (*gc_mark_dynamic_ref) 1019 (struct elf_link_hash_entry *, void *); 1020 1021 /* This function is called during section gc to discover the section a 1022 particular relocation refers to. */ 1023 elf_gc_mark_hook_fn gc_mark_hook; 1024 1025 /* This function, if defined, is called after the first gc marking pass 1026 to allow the backend to mark additional sections. */ 1027 bfd_boolean (*gc_mark_extra_sections) 1028 (struct bfd_link_info *, elf_gc_mark_hook_fn); 1029 1030 /* This function, if defined, is called during the sweep phase of gc 1031 in order that a backend might update any data structures it might 1032 be maintaining. */ 1033 bfd_boolean (*gc_sweep_hook) 1034 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); 1035 1036 /* This function, if defined, is called after the ELF headers have 1037 been created. This allows for things like the OS and ABI versions 1038 to be changed. */ 1039 void (*elf_backend_post_process_headers) 1040 (bfd *, struct bfd_link_info *); 1041 1042 /* This function, if defined, prints a symbol to file and returns the 1043 name of the symbol to be printed. It should return NULL to fall 1044 back to default symbol printing. */ 1045 const char *(*elf_backend_print_symbol_all) 1046 (bfd *, void *, asymbol *); 1047 1048 /* This function, if defined, is called after all local symbols and 1049 global symbols converted to locals are emitted into the symtab 1050 section. It allows the backend to emit special local symbols 1051 not handled in the hash table. */ 1052 bfd_boolean (*elf_backend_output_arch_local_syms) 1053 (bfd *, struct bfd_link_info *, void *, 1054 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1055 struct elf_link_hash_entry *)); 1056 1057 /* This function, if defined, is called after all symbols are emitted 1058 into the symtab section. It allows the backend to emit special 1059 global symbols not handled in the hash table. */ 1060 bfd_boolean (*elf_backend_output_arch_syms) 1061 (bfd *, struct bfd_link_info *, void *, 1062 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1063 struct elf_link_hash_entry *)); 1064 1065 /* Copy any information related to dynamic linking from a pre-existing 1066 symbol to a newly created symbol. Also called to copy flags and 1067 other back-end info to a weakdef, in which case the symbol is not 1068 newly created and plt/got refcounts and dynamic indices should not 1069 be copied. */ 1070 void (*elf_backend_copy_indirect_symbol) 1071 (struct bfd_link_info *, struct elf_link_hash_entry *, 1072 struct elf_link_hash_entry *); 1073 1074 /* Modify any information related to dynamic linking such that the 1075 symbol is not exported. */ 1076 void (*elf_backend_hide_symbol) 1077 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1078 1079 /* A function to do additional symbol fixup, called by 1080 _bfd_elf_fix_symbol_flags. */ 1081 bfd_boolean (*elf_backend_fixup_symbol) 1082 (struct bfd_link_info *, struct elf_link_hash_entry *); 1083 1084 /* Merge the backend specific symbol attribute. */ 1085 void (*elf_backend_merge_symbol_attribute) 1086 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean, 1087 bfd_boolean); 1088 1089 /* This function, if defined, will return a string containing the 1090 name of a target-specific dynamic tag. */ 1091 char *(*elf_backend_get_target_dtag) 1092 (bfd_vma); 1093 1094 /* Decide whether an undefined symbol is special and can be ignored. 1095 This is the case for OPTIONAL symbols on IRIX. */ 1096 bfd_boolean (*elf_backend_ignore_undef_symbol) 1097 (struct elf_link_hash_entry *); 1098 1099 /* Emit relocations. Overrides default routine for emitting relocs, 1100 except during a relocatable link, or if all relocs are being emitted. */ 1101 bfd_boolean (*elf_backend_emit_relocs) 1102 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 1103 struct elf_link_hash_entry **); 1104 1105 /* Count relocations. Not called for relocatable links 1106 or if all relocs are being preserved in the output. */ 1107 unsigned int (*elf_backend_count_relocs) 1108 (struct bfd_link_info *, asection *); 1109 1110 /* This function, if defined, is called when an NT_PRSTATUS note is found 1111 in a core file. */ 1112 bfd_boolean (*elf_backend_grok_prstatus) 1113 (bfd *, Elf_Internal_Note *); 1114 1115 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO 1116 note is found in a core file. */ 1117 bfd_boolean (*elf_backend_grok_psinfo) 1118 (bfd *, Elf_Internal_Note *); 1119 1120 /* This function, if defined, is called to write a note to a corefile. */ 1121 char *(*elf_backend_write_core_note) 1122 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...); 1123 1124 /* This function, if defined, is called to convert target-specific 1125 section flag names into hex values. */ 1126 flagword (*elf_backend_lookup_section_flags_hook) 1127 (char *); 1128 1129 /* This function returns class of a reloc type. */ 1130 enum elf_reloc_type_class (*elf_backend_reloc_type_class) 1131 (const Elf_Internal_Rela *); 1132 1133 /* This function, if defined, removes information about discarded functions 1134 from other sections which mention them. */ 1135 bfd_boolean (*elf_backend_discard_info) 1136 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *); 1137 1138 /* This function, if defined, signals that the function above has removed 1139 the discarded relocations for this section. */ 1140 bfd_boolean (*elf_backend_ignore_discarded_relocs) 1141 (asection *); 1142 1143 /* What to do when ld finds relocations against symbols defined in 1144 discarded sections. */ 1145 unsigned int (*action_discarded) 1146 (asection *); 1147 1148 /* This function returns the width of FDE pointers in bytes, or 0 if 1149 that can't be determined for some reason. The default definition 1150 goes by the bfd's EI_CLASS. */ 1151 unsigned int (*elf_backend_eh_frame_address_size) 1152 (bfd *, asection *); 1153 1154 /* These functions tell elf-eh-frame whether to attempt to turn 1155 absolute or lsda encodings into pc-relative ones. The default 1156 definition enables these transformations. */ 1157 bfd_boolean (*elf_backend_can_make_relative_eh_frame) 1158 (bfd *, struct bfd_link_info *, asection *); 1159 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame) 1160 (bfd *, struct bfd_link_info *, asection *); 1161 1162 /* This function returns an encoding after computing the encoded 1163 value (and storing it in ENCODED) for the given OFFSET into OSEC, 1164 to be stored in at LOC_OFFSET into the LOC_SEC input section. 1165 The default definition chooses a 32-bit PC-relative encoding. */ 1166 bfd_byte (*elf_backend_encode_eh_address) 1167 (bfd *abfd, struct bfd_link_info *info, 1168 asection *osec, bfd_vma offset, 1169 asection *loc_sec, bfd_vma loc_offset, 1170 bfd_vma *encoded); 1171 1172 /* This function, if defined, may write out the given section. 1173 Returns TRUE if it did so and FALSE if the caller should. */ 1174 bfd_boolean (*elf_backend_write_section) 1175 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1176 1177 /* The level of IRIX compatibility we're striving for. 1178 MIPS ELF specific function. */ 1179 irix_compat_t (*elf_backend_mips_irix_compat) 1180 (bfd *); 1181 1182 reloc_howto_type *(*elf_backend_mips_rtype_to_howto) 1183 (unsigned int, bfd_boolean); 1184 1185 /* The swapping table to use when dealing with ECOFF information. 1186 Used for the MIPS ELF .mdebug section. */ 1187 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap; 1188 1189 /* This function implements `bfd_elf_bfd_from_remote_memory'; 1190 see elf.c, elfcode.h. */ 1191 bfd *(*elf_backend_bfd_from_remote_memory) 1192 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 1193 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, 1194 bfd_size_type len)); 1195 1196 /* This function is used by `_bfd_elf_get_synthetic_symtab'; 1197 see elf.c. */ 1198 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *); 1199 1200 /* Is symbol defined in common section? */ 1201 bfd_boolean (*common_definition) (Elf_Internal_Sym *); 1202 1203 /* Return a common section index for section. */ 1204 unsigned int (*common_section_index) (asection *); 1205 1206 /* Return a common section for section. */ 1207 asection *(*common_section) (asection *); 1208 1209 /* Return TRUE if we can merge 2 definitions. */ 1210 bfd_boolean (*merge_symbol) (struct bfd_link_info *, 1211 struct elf_link_hash_entry **, 1212 struct elf_link_hash_entry *, 1213 Elf_Internal_Sym *, asection **, 1214 bfd_vma *, unsigned int *, 1215 bfd_boolean *, bfd_boolean *, 1216 bfd_boolean *, bfd_boolean *, 1217 bfd_boolean *, bfd_boolean *, 1218 bfd_boolean *, bfd_boolean *, 1219 bfd *, asection **, 1220 bfd_boolean *, bfd_boolean *, 1221 bfd_boolean *, bfd_boolean *, 1222 bfd *, asection **); 1223 1224 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 1225 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *); 1226 1227 /* Return TRUE if type is a function symbol type. */ 1228 bfd_boolean (*is_function_type) (unsigned int type); 1229 1230 /* If the ELF symbol SYM might be a function in SEC, return the 1231 function size and set *CODE_OFF to the function's entry point, 1232 otherwise return zero. */ 1233 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec, 1234 bfd_vma *code_off); 1235 1236 /* Used to handle bad SHF_LINK_ORDER input. */ 1237 bfd_error_handler_type link_order_error_handler; 1238 1239 /* Name of the PLT relocation section. */ 1240 const char *relplt_name; 1241 1242 /* Alternate EM_xxxx machine codes for this backend. */ 1243 int elf_machine_alt1; 1244 int elf_machine_alt2; 1245 1246 const struct elf_size_info *s; 1247 1248 /* An array of target specific special sections. */ 1249 const struct bfd_elf_special_section *special_sections; 1250 1251 /* The size in bytes of the header for the GOT. This includes the 1252 so-called reserved entries on some systems. */ 1253 bfd_vma got_header_size; 1254 1255 /* The size of the GOT entry for the symbol pointed to by H if non-NULL, 1256 otherwise by the local symbol with index SYMNDX in IBFD. */ 1257 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *, 1258 struct elf_link_hash_entry *h, 1259 bfd *ibfd, unsigned long symndx); 1260 1261 /* The vendor name to use for a processor-standard attributes section. */ 1262 const char *obj_attrs_vendor; 1263 1264 /* The section name to use for a processor-standard attributes section. */ 1265 const char *obj_attrs_section; 1266 1267 /* Return 1, 2 or 3 to indicate what type of arguments a 1268 processor-specific tag takes. */ 1269 int (*obj_attrs_arg_type) (int); 1270 1271 /* The section type to use for an attributes section. */ 1272 unsigned int obj_attrs_section_type; 1273 1274 /* This function determines the order in which any attributes are 1275 written. It must be defined for input in the range 1276 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range 1277 is used in order to make unity easy). The returned value is the 1278 actual tag number to place in the input position. */ 1279 int (*obj_attrs_order) (int); 1280 1281 /* Handle merging unknown attributes; either warn and return TRUE, 1282 or give an error and return FALSE. */ 1283 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int); 1284 1285 /* This is non-zero if static TLS segments require a special alignment. */ 1286 unsigned static_tls_alignment; 1287 1288 /* Alignment for the PT_GNU_STACK segment. */ 1289 unsigned stack_align; 1290 1291 /* This is TRUE if the linker should act like collect and gather 1292 global constructors and destructors by name. This is TRUE for 1293 MIPS ELF because the Irix 5 tools can not handle the .init 1294 section. */ 1295 unsigned collect : 1; 1296 1297 /* This is TRUE if the linker should ignore changes to the type of a 1298 symbol. This is TRUE for MIPS ELF because some Irix 5 objects 1299 record undefined functions as STT_OBJECT although the definitions 1300 are STT_FUNC. */ 1301 unsigned type_change_ok : 1; 1302 1303 /* Whether the backend may use REL relocations. (Some backends use 1304 both REL and RELA relocations, and this flag is set for those 1305 backends.) */ 1306 unsigned may_use_rel_p : 1; 1307 1308 /* Whether the backend may use RELA relocations. (Some backends use 1309 both REL and RELA relocations, and this flag is set for those 1310 backends.) */ 1311 unsigned may_use_rela_p : 1; 1312 1313 /* Whether the default relocation type is RELA. If a backend with 1314 this flag set wants REL relocations for a particular section, 1315 it must note that explicitly. Similarly, if this flag is clear, 1316 and the backend wants RELA relocations for a particular 1317 section. */ 1318 unsigned default_use_rela_p : 1; 1319 1320 /* True if PLT and copy relocations should be RELA by default. */ 1321 unsigned rela_plts_and_copies_p : 1; 1322 1323 /* Set if RELA relocations for a relocatable link can be handled by 1324 generic code. Backends that set this flag need do nothing in the 1325 backend relocate_section routine for relocatable linking. */ 1326 unsigned rela_normal : 1; 1327 1328 /* TRUE if addresses "naturally" sign extend. This is used when 1329 swapping in from Elf32 when BFD64. */ 1330 unsigned sign_extend_vma : 1; 1331 1332 unsigned want_got_plt : 1; 1333 unsigned plt_readonly : 1; 1334 unsigned want_plt_sym : 1; 1335 unsigned plt_not_loaded : 1; 1336 unsigned plt_alignment : 4; 1337 unsigned can_gc_sections : 1; 1338 unsigned can_refcount : 1; 1339 unsigned want_got_sym : 1; 1340 unsigned want_dynbss : 1; 1341 1342 /* Targets which do not support physical addressing often require 1343 that the p_paddr field in the section header to be set to zero. 1344 This field indicates whether this behavior is required. */ 1345 unsigned want_p_paddr_set_to_zero : 1; 1346 1347 /* True if an object file lacking a .note.GNU-stack section 1348 should be assumed to be requesting exec stack. At least one 1349 other file in the link needs to have a .note.GNU-stack section 1350 for a PT_GNU_STACK segment to be created. */ 1351 unsigned default_execstack : 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). */ 1462 1463 typedef struct obj_attribute 1464 { 1465 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0) 1466 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1) 1467 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2) 1468 1469 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL) 1470 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL) 1471 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT) 1472 1473 int type; 1474 unsigned int i; 1475 char *s; 1476 } obj_attribute; 1477 1478 typedef struct obj_attribute_list 1479 { 1480 struct obj_attribute_list *next; 1481 int tag; 1482 obj_attribute attr; 1483 } obj_attribute_list; 1484 1485 /* Object attributes may either be defined by the processor ABI, index 1486 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific 1487 (and possibly also processor-specific), index OBJ_ATTR_GNU. */ 1488 #define OBJ_ATTR_PROC 0 1489 #define OBJ_ATTR_GNU 1 1490 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC 1491 #define OBJ_ATTR_LAST OBJ_ATTR_GNU 1492 1493 /* The following object attribute tags are taken as generic, for all 1494 targets and for "gnu" where there is no target standard. */ 1495 enum 1496 { 1497 Tag_NULL = 0, 1498 Tag_File = 1, 1499 Tag_Section = 2, 1500 Tag_Symbol = 3, 1501 Tag_compatibility = 32 1502 }; 1503 1504 /* The following struct stores information about every SystemTap section 1505 found in the object file. */ 1506 struct sdt_note 1507 { 1508 struct sdt_note *next; 1509 bfd_size_type size; 1510 bfd_byte data[1]; 1511 }; 1512 1513 /* NT_GNU_BUILD_ID note type info for input BFDs. */ 1514 struct elf_build_id 1515 { 1516 size_t size; 1517 bfd_byte data[1]; 1518 }; 1519 1520 /* tdata information grabbed from an elf core file. */ 1521 struct core_elf_obj_tdata 1522 { 1523 int signal; 1524 int pid; 1525 int lwpid; 1526 char* program; 1527 char* command; 1528 }; 1529 1530 /* Extra tdata information held for output ELF BFDs. */ 1531 struct output_elf_obj_tdata 1532 { 1533 struct elf_segment_map *seg_map; 1534 struct elf_strtab_hash *strtab_ptr; 1535 1536 /* STT_SECTION symbols for each section */ 1537 asymbol **section_syms; 1538 1539 /* Used to determine if PT_GNU_EH_FRAME segment header should be 1540 created. */ 1541 asection *eh_frame_hdr; 1542 1543 /* NT_GNU_BUILD_ID note type info. */ 1544 struct 1545 { 1546 bfd_boolean (*after_write_object_contents) (bfd *); 1547 const char *style; 1548 asection *sec; 1549 } build_id; 1550 1551 /* Records the result of `get_program_header_size'. */ 1552 bfd_size_type program_header_size; 1553 1554 /* Used when laying out sections. */ 1555 file_ptr next_file_pos; 1556 1557 int num_section_syms; 1558 unsigned int shstrtab_section, strtab_section; 1559 1560 /* Segment flags for the PT_GNU_STACK segment. */ 1561 unsigned int stack_flags; 1562 1563 /* This is set to TRUE if the object was created by the backend 1564 linker. */ 1565 bfd_boolean linker; 1566 1567 /* Used to determine if the e_flags field has been initialized */ 1568 bfd_boolean flags_init; 1569 }; 1570 1571 /* Some private data is stashed away for future use using the tdata pointer 1572 in the bfd structure. */ 1573 1574 struct elf_obj_tdata 1575 { 1576 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ 1577 Elf_Internal_Shdr **elf_sect_ptr; 1578 Elf_Internal_Phdr *phdr; 1579 Elf_Internal_Shdr symtab_hdr; 1580 Elf_Internal_Shdr shstrtab_hdr; 1581 Elf_Internal_Shdr strtab_hdr; 1582 Elf_Internal_Shdr dynsymtab_hdr; 1583 Elf_Internal_Shdr dynstrtab_hdr; 1584 Elf_Internal_Shdr dynversym_hdr; 1585 Elf_Internal_Shdr dynverref_hdr; 1586 Elf_Internal_Shdr dynverdef_hdr; 1587 Elf_Internal_Shdr symtab_shndx_hdr; 1588 bfd_vma gp; /* The gp value */ 1589 unsigned int gp_size; /* The gp size */ 1590 unsigned int num_elf_sections; /* elf_sect_ptr size */ 1591 1592 /* A mapping from external symbols to entries in the linker hash 1593 table, used when linking. This is indexed by the symbol index 1594 minus the sh_info field of the symbol table header. */ 1595 struct elf_link_hash_entry **sym_hashes; 1596 1597 /* Track usage and final offsets of GOT entries for local symbols. 1598 This array is indexed by symbol index. Elements are used 1599 identically to "got" in struct elf_link_hash_entry. */ 1600 union 1601 { 1602 bfd_signed_vma *refcounts; 1603 bfd_vma *offsets; 1604 struct got_entry **ents; 1605 } local_got; 1606 1607 /* The linker ELF emulation code needs to let the backend ELF linker 1608 know what filename should be used for a dynamic object if the 1609 dynamic object is found using a search. The emulation code then 1610 sometimes needs to know what name was actually used. Until the 1611 file has been added to the linker symbol table, this field holds 1612 the name the linker wants. After it has been added, it holds the 1613 name actually used, which will be the DT_SONAME entry if there is 1614 one. */ 1615 const char *dt_name; 1616 1617 /* The linker emulation needs to know what audit libs 1618 are used by a dynamic object. */ 1619 const char *dt_audit; 1620 1621 /* Used by find_nearest_line entry point. */ 1622 void *line_info; 1623 1624 /* A place to stash dwarf1 info for this bfd. */ 1625 struct dwarf1_debug *dwarf1_find_line_info; 1626 1627 /* A place to stash dwarf2 info for this bfd. */ 1628 void *dwarf2_find_line_info; 1629 1630 /* Stash away info for yet another find line/function variant. */ 1631 void *elf_find_function_cache; 1632 1633 /* Number of symbol version definitions we are about to emit. */ 1634 unsigned int cverdefs; 1635 1636 /* Number of symbol version references we are about to emit. */ 1637 unsigned int cverrefs; 1638 1639 /* Symbol version definitions in external objects. */ 1640 Elf_Internal_Verdef *verdef; 1641 1642 /* Symbol version references to external objects. */ 1643 Elf_Internal_Verneed *verref; 1644 1645 /* A pointer to the .eh_frame section. */ 1646 asection *eh_frame_section; 1647 1648 /* Symbol buffer. */ 1649 void *symbuf; 1650 1651 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES]; 1652 obj_attribute_list *other_obj_attributes[2]; 1653 1654 /* NT_GNU_BUILD_ID note type. */ 1655 struct elf_build_id *build_id; 1656 1657 /* Linked-list containing information about every Systemtap section 1658 found in the object file. Each section corresponds to one entry 1659 in the list. */ 1660 struct sdt_note *sdt_note_head; 1661 1662 Elf_Internal_Shdr **group_sect_ptr; 1663 int num_group; 1664 1665 unsigned int symtab_section, symtab_shndx_section, dynsymtab_section; 1666 unsigned int dynversym_section, dynverdef_section, dynverref_section; 1667 1668 /* An identifier used to distinguish different target 1669 specific extensions to this structure. */ 1670 enum elf_target_id object_id; 1671 1672 /* Whether a dyanmic object was specified normally on the linker 1673 command line, or was specified when --as-needed was in effect, 1674 or was found via a DT_NEEDED entry. */ 1675 enum dynamic_lib_link_class dyn_lib_class; 1676 1677 /* Irix 5 often screws up the symbol table, sorting local symbols 1678 after global symbols. This flag is set if the symbol table in 1679 this BFD appears to be screwed up. If it is, we ignore the 1680 sh_info field in the symbol table header, and always read all the 1681 symbols. */ 1682 bfd_boolean bad_symtab; 1683 1684 /* True if the bfd contains symbols that have the STT_GNU_IFUNC 1685 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi 1686 field in the ELF header structure. */ 1687 bfd_boolean has_gnu_symbols; 1688 1689 /* Information grabbed from an elf core file. */ 1690 struct core_elf_obj_tdata *core; 1691 1692 /* More information held for output ELF BFDs. */ 1693 struct output_elf_obj_tdata *o; 1694 }; 1695 1696 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) 1697 1698 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id) 1699 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size) 1700 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) 1701 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) 1702 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections) 1703 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map) 1704 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos) 1705 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr) 1706 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker) 1707 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags) 1708 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr) 1709 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) 1710 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section) 1711 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section) 1712 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section) 1713 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr) 1714 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section) 1715 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section) 1716 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section) 1717 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section) 1718 #define elf_eh_frame_section(bfd) \ 1719 (elf_tdata(bfd) -> eh_frame_section) 1720 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms) 1721 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms) 1722 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) 1723 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) 1724 #define elf_gp(bfd) (elf_tdata(bfd) -> gp) 1725 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size) 1726 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes) 1727 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts) 1728 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets) 1729 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents) 1730 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name) 1731 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit) 1732 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class) 1733 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab) 1734 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init) 1735 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes) 1736 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes) 1737 #define elf_known_obj_attributes_proc(bfd) \ 1738 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1739 #define elf_other_obj_attributes_proc(bfd) \ 1740 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC]) 1741 1742 extern void _bfd_elf_swap_verdef_in 1743 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *); 1744 extern void _bfd_elf_swap_verdef_out 1745 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *); 1746 extern void _bfd_elf_swap_verdaux_in 1747 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *); 1748 extern void _bfd_elf_swap_verdaux_out 1749 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *); 1750 extern void _bfd_elf_swap_verneed_in 1751 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *); 1752 extern void _bfd_elf_swap_verneed_out 1753 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *); 1754 extern void _bfd_elf_swap_vernaux_in 1755 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *); 1756 extern void _bfd_elf_swap_vernaux_out 1757 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *); 1758 extern void _bfd_elf_swap_versym_in 1759 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *); 1760 extern void _bfd_elf_swap_versym_out 1761 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *); 1762 1763 extern unsigned int _bfd_elf_section_from_bfd_section 1764 (bfd *, asection *); 1765 extern char *bfd_elf_string_from_elf_section 1766 (bfd *, unsigned, unsigned); 1767 extern Elf_Internal_Sym *bfd_elf_get_elf_syms 1768 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *, 1769 Elf_External_Sym_Shndx *); 1770 extern const char *bfd_elf_sym_name 1771 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *); 1772 1773 extern bfd_boolean _bfd_elf_copy_private_bfd_data 1774 (bfd *, bfd *); 1775 extern bfd_boolean _bfd_elf_print_private_bfd_data 1776 (bfd *, void *); 1777 extern void bfd_elf_print_symbol 1778 (bfd *, void *, asymbol *, bfd_print_symbol_type); 1779 1780 extern unsigned int _bfd_elf_eh_frame_address_size 1781 (bfd *, asection *); 1782 extern bfd_byte _bfd_elf_encode_eh_address 1783 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset, 1784 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded); 1785 extern bfd_boolean _bfd_elf_can_make_relative 1786 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section); 1787 1788 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class 1789 (const Elf_Internal_Rela *); 1790 extern bfd_vma _bfd_elf_rela_local_sym 1791 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *); 1792 extern bfd_vma _bfd_elf_rel_local_sym 1793 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma); 1794 extern bfd_vma _bfd_elf_section_offset 1795 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1796 1797 extern unsigned long bfd_elf_hash 1798 (const char *); 1799 extern unsigned long bfd_elf_gnu_hash 1800 (const char *); 1801 1802 extern bfd_reloc_status_type bfd_elf_generic_reloc 1803 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 1804 extern bfd_boolean bfd_elf_allocate_object 1805 (bfd *, size_t, enum elf_target_id); 1806 extern bfd_boolean bfd_elf_make_object 1807 (bfd *); 1808 extern bfd_boolean bfd_elf_mkcorefile 1809 (bfd *); 1810 extern bfd_boolean _bfd_elf_make_section_from_shdr 1811 (bfd *, Elf_Internal_Shdr *, const char *, int); 1812 extern bfd_boolean _bfd_elf_make_section_from_phdr 1813 (bfd *, Elf_Internal_Phdr *, int, const char *); 1814 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc 1815 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 1816 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create 1817 (bfd *); 1818 extern void _bfd_elf_link_hash_table_free 1819 (struct bfd_link_hash_table *); 1820 extern void _bfd_elf_link_hash_copy_indirect 1821 (struct bfd_link_info *, struct elf_link_hash_entry *, 1822 struct elf_link_hash_entry *); 1823 extern void _bfd_elf_link_hash_hide_symbol 1824 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1825 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol 1826 (struct bfd_link_info *, struct elf_link_hash_entry *); 1827 extern bfd_boolean _bfd_elf_link_hash_table_init 1828 (struct elf_link_hash_table *, bfd *, 1829 struct bfd_hash_entry *(*) 1830 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *), 1831 unsigned int, enum elf_target_id); 1832 extern bfd_boolean _bfd_elf_slurp_version_tables 1833 (bfd *, bfd_boolean); 1834 extern bfd_boolean _bfd_elf_merge_sections 1835 (bfd *, struct bfd_link_info *); 1836 extern bfd_boolean _bfd_elf_match_sections_by_type 1837 (bfd *, const asection *, bfd *, const asection *); 1838 extern bfd_boolean bfd_elf_is_group_section 1839 (bfd *, const struct bfd_section *); 1840 extern bfd_boolean _bfd_elf_section_already_linked 1841 (bfd *, asection *, struct bfd_link_info *); 1842 extern void bfd_elf_set_group_contents 1843 (bfd *, asection *, void *); 1844 extern asection *_bfd_elf_check_kept_section 1845 (asection *, struct bfd_link_info *); 1846 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms 1847 extern void _bfd_elf_copy_link_hash_symbol_type 1848 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *); 1849 extern bfd_boolean _bfd_elf_size_group_sections 1850 (struct bfd_link_info *); 1851 extern bfd_boolean _bfd_elf_fixup_group_sections 1852 (bfd *, asection *); 1853 extern bfd_boolean _bfd_elf_copy_private_header_data 1854 (bfd *, bfd *); 1855 extern bfd_boolean _bfd_elf_copy_private_symbol_data 1856 (bfd *, asymbol *, bfd *, asymbol *); 1857 #define _bfd_generic_init_private_section_data \ 1858 _bfd_elf_init_private_section_data 1859 extern bfd_boolean _bfd_elf_init_private_section_data 1860 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *); 1861 extern bfd_boolean _bfd_elf_copy_private_section_data 1862 (bfd *, asection *, bfd *, asection *); 1863 extern bfd_boolean _bfd_elf_write_object_contents 1864 (bfd *); 1865 extern bfd_boolean _bfd_elf_write_corefile_contents 1866 (bfd *); 1867 extern bfd_boolean _bfd_elf_set_section_contents 1868 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 1869 extern long _bfd_elf_get_symtab_upper_bound 1870 (bfd *); 1871 extern long _bfd_elf_canonicalize_symtab 1872 (bfd *, asymbol **); 1873 extern long _bfd_elf_get_dynamic_symtab_upper_bound 1874 (bfd *); 1875 extern long _bfd_elf_canonicalize_dynamic_symtab 1876 (bfd *, asymbol **); 1877 extern long _bfd_elf_get_synthetic_symtab 1878 (bfd *, long, asymbol **, long, asymbol **, asymbol **); 1879 extern long _bfd_elf_get_reloc_upper_bound 1880 (bfd *, sec_ptr); 1881 extern long _bfd_elf_canonicalize_reloc 1882 (bfd *, sec_ptr, arelent **, asymbol **); 1883 extern asection * _bfd_elf_get_dynamic_reloc_section 1884 (bfd *, asection *, bfd_boolean); 1885 extern asection * _bfd_elf_make_dynamic_reloc_section 1886 (asection *, bfd *, unsigned int, bfd *, bfd_boolean); 1887 extern long _bfd_elf_get_dynamic_reloc_upper_bound 1888 (bfd *); 1889 extern long _bfd_elf_canonicalize_dynamic_reloc 1890 (bfd *, arelent **, asymbol **); 1891 extern asymbol *_bfd_elf_make_empty_symbol 1892 (bfd *); 1893 extern void _bfd_elf_get_symbol_info 1894 (bfd *, asymbol *, symbol_info *); 1895 extern bfd_boolean _bfd_elf_is_local_label_name 1896 (bfd *, const char *); 1897 extern alent *_bfd_elf_get_lineno 1898 (bfd *, asymbol *); 1899 extern bfd_boolean _bfd_elf_set_arch_mach 1900 (bfd *, enum bfd_architecture, unsigned long); 1901 extern bfd_boolean _bfd_elf_find_nearest_line 1902 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, 1903 unsigned int *); 1904 extern bfd_boolean _bfd_elf_find_nearest_line_discriminator 1905 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, 1906 unsigned int *, unsigned int *); 1907 extern bfd_boolean _bfd_elf_find_line 1908 (bfd *, asymbol **, asymbol *, const char **, unsigned int *); 1909 extern bfd_boolean _bfd_elf_find_line_discriminator 1910 (bfd *, asymbol **, asymbol *, const char **, unsigned int *, unsigned int *); 1911 #define _bfd_generic_find_line _bfd_elf_find_line 1912 #define _bfd_generic_find_nearest_line_discriminator \ 1913 _bfd_elf_find_nearest_line_discriminator 1914 extern bfd_boolean _bfd_elf_find_inliner_info 1915 (bfd *, const char **, const char **, unsigned int *); 1916 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols 1917 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 1918 extern int _bfd_elf_sizeof_headers 1919 (bfd *, struct bfd_link_info *); 1920 extern bfd_boolean _bfd_elf_new_section_hook 1921 (bfd *, asection *); 1922 extern bfd_boolean _bfd_elf_init_reloc_shdr 1923 (bfd *, struct bfd_elf_section_reloc_data *, asection *, bfd_boolean); 1924 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section 1925 (const char *, const struct bfd_elf_special_section *, unsigned int); 1926 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr 1927 (bfd *, asection *); 1928 1929 /* If the target doesn't have reloc handling written yet: */ 1930 extern void _bfd_elf_no_info_to_howto 1931 (bfd *, arelent *, Elf_Internal_Rela *); 1932 1933 extern bfd_boolean bfd_section_from_shdr 1934 (bfd *, unsigned int shindex); 1935 extern bfd_boolean bfd_section_from_phdr 1936 (bfd *, Elf_Internal_Phdr *, int); 1937 1938 extern int _bfd_elf_symbol_from_bfd_symbol 1939 (bfd *, asymbol **); 1940 1941 extern Elf_Internal_Sym *bfd_sym_from_r_symndx 1942 (struct sym_cache *, bfd *, unsigned long); 1943 extern asection *bfd_section_from_elf_index 1944 (bfd *, unsigned int); 1945 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init 1946 (void); 1947 1948 extern struct elf_strtab_hash * _bfd_elf_strtab_init 1949 (void); 1950 extern void _bfd_elf_strtab_free 1951 (struct elf_strtab_hash *); 1952 extern bfd_size_type _bfd_elf_strtab_add 1953 (struct elf_strtab_hash *, const char *, bfd_boolean); 1954 extern void _bfd_elf_strtab_addref 1955 (struct elf_strtab_hash *, bfd_size_type); 1956 extern void _bfd_elf_strtab_delref 1957 (struct elf_strtab_hash *, bfd_size_type); 1958 extern unsigned int _bfd_elf_strtab_refcount 1959 (struct elf_strtab_hash *, bfd_size_type); 1960 extern void _bfd_elf_strtab_clear_all_refs 1961 (struct elf_strtab_hash *tab); 1962 extern void _bfd_elf_strtab_restore_size 1963 (struct elf_strtab_hash *, bfd_size_type); 1964 extern bfd_size_type _bfd_elf_strtab_size 1965 (struct elf_strtab_hash *); 1966 extern bfd_size_type _bfd_elf_strtab_offset 1967 (struct elf_strtab_hash *, bfd_size_type); 1968 extern bfd_boolean _bfd_elf_strtab_emit 1969 (bfd *, struct elf_strtab_hash *); 1970 extern void _bfd_elf_strtab_finalize 1971 (struct elf_strtab_hash *); 1972 1973 extern void _bfd_elf_begin_eh_frame_parsing 1974 (struct bfd_link_info *info); 1975 extern void _bfd_elf_parse_eh_frame 1976 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 1977 extern void _bfd_elf_end_eh_frame_parsing 1978 (struct bfd_link_info *info); 1979 1980 extern bfd_boolean _bfd_elf_discard_section_eh_frame 1981 (bfd *, struct bfd_link_info *, asection *, 1982 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *); 1983 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr 1984 (bfd *, struct bfd_link_info *); 1985 extern bfd_vma _bfd_elf_eh_frame_section_offset 1986 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 1987 extern bfd_boolean _bfd_elf_write_section_eh_frame 1988 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1989 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr 1990 (bfd *, struct bfd_link_info *); 1991 extern bfd_boolean _bfd_elf_eh_frame_present 1992 (struct bfd_link_info *); 1993 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr 1994 (struct bfd_link_info *); 1995 1996 extern bfd_boolean _bfd_elf_merge_symbol 1997 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *, 1998 asection **, bfd_vma *, bfd_boolean *, unsigned int *, 1999 struct elf_link_hash_entry **, bfd_boolean *, 2000 bfd_boolean *, bfd_boolean *, bfd_boolean *); 2001 2002 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *); 2003 2004 extern long _bfd_elf_link_lookup_local_dynindx 2005 (struct bfd_link_info *, bfd *, long); 2006 extern bfd_boolean _bfd_elf_compute_section_file_positions 2007 (bfd *, struct bfd_link_info *); 2008 extern void _bfd_elf_assign_file_positions_for_relocs 2009 (bfd *); 2010 extern file_ptr _bfd_elf_assign_file_position_for_section 2011 (Elf_Internal_Shdr *, file_ptr, bfd_boolean); 2012 2013 extern bfd_boolean _bfd_elf_validate_reloc 2014 (bfd *, arelent *); 2015 2016 extern bfd_boolean _bfd_elf_link_create_dynamic_sections 2017 (bfd *, struct bfd_link_info *); 2018 extern bfd_boolean _bfd_elf_link_omit_section_dynsym 2019 (bfd *, struct bfd_link_info *, asection *); 2020 extern bfd_boolean _bfd_elf_create_dynamic_sections 2021 (bfd *, struct bfd_link_info *); 2022 extern bfd_boolean _bfd_elf_create_got_section 2023 (bfd *, struct bfd_link_info *); 2024 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym 2025 (bfd *, struct bfd_link_info *, asection *, const char *); 2026 extern void _bfd_elf_init_1_index_section 2027 (bfd *, struct bfd_link_info *); 2028 extern void _bfd_elf_init_2_index_sections 2029 (bfd *, struct bfd_link_info *); 2030 2031 extern bfd_boolean _bfd_elfcore_make_pseudosection 2032 (bfd *, char *, size_t, ufile_ptr); 2033 extern char *_bfd_elfcore_strndup 2034 (bfd *, char *, size_t); 2035 2036 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs 2037 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean); 2038 2039 extern bfd_boolean _bfd_elf_link_output_relocs 2040 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 2041 struct elf_link_hash_entry **); 2042 2043 extern bfd_boolean _bfd_elf_adjust_dynamic_copy 2044 (struct elf_link_hash_entry *, asection *); 2045 2046 extern bfd_boolean _bfd_elf_dynamic_symbol_p 2047 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2048 2049 extern bfd_boolean _bfd_elf_symbol_refs_local_p 2050 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2051 2052 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation 2053 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma); 2054 2055 extern bfd_boolean _bfd_elf_setup_sections 2056 (bfd *); 2057 2058 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *); 2059 2060 extern const bfd_target *bfd_elf32_object_p 2061 (bfd *); 2062 extern const bfd_target *bfd_elf32_core_file_p 2063 (bfd *); 2064 extern char *bfd_elf32_core_file_failing_command 2065 (bfd *); 2066 extern int bfd_elf32_core_file_failing_signal 2067 (bfd *); 2068 extern bfd_boolean bfd_elf32_core_file_matches_executable_p 2069 (bfd *, bfd *); 2070 extern int bfd_elf32_core_file_pid 2071 (bfd *); 2072 2073 extern bfd_boolean bfd_elf32_swap_symbol_in 2074 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2075 extern void bfd_elf32_swap_symbol_out 2076 (bfd *, const Elf_Internal_Sym *, void *, void *); 2077 extern void bfd_elf32_swap_reloc_in 2078 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2079 extern void bfd_elf32_swap_reloc_out 2080 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2081 extern void bfd_elf32_swap_reloca_in 2082 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2083 extern void bfd_elf32_swap_reloca_out 2084 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2085 extern void bfd_elf32_swap_phdr_in 2086 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *); 2087 extern void bfd_elf32_swap_phdr_out 2088 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *); 2089 extern void bfd_elf32_swap_dyn_in 2090 (bfd *, const void *, Elf_Internal_Dyn *); 2091 extern void bfd_elf32_swap_dyn_out 2092 (bfd *, const Elf_Internal_Dyn *, void *); 2093 extern long bfd_elf32_slurp_symbol_table 2094 (bfd *, asymbol **, bfd_boolean); 2095 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr 2096 (bfd *); 2097 extern int bfd_elf32_write_out_phdrs 2098 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2099 extern bfd_boolean bfd_elf32_checksum_contents 2100 (bfd * , void (*) (const void *, size_t, void *), void *); 2101 extern void bfd_elf32_write_relocs 2102 (bfd *, asection *, void *); 2103 extern bfd_boolean bfd_elf32_slurp_reloc_table 2104 (bfd *, asection *, asymbol **, bfd_boolean); 2105 2106 extern const bfd_target *bfd_elf64_object_p 2107 (bfd *); 2108 extern const bfd_target *bfd_elf64_core_file_p 2109 (bfd *); 2110 extern char *bfd_elf64_core_file_failing_command 2111 (bfd *); 2112 extern int bfd_elf64_core_file_failing_signal 2113 (bfd *); 2114 extern bfd_boolean bfd_elf64_core_file_matches_executable_p 2115 (bfd *, bfd *); 2116 extern int bfd_elf64_core_file_pid 2117 (bfd *); 2118 2119 extern bfd_boolean bfd_elf64_swap_symbol_in 2120 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2121 extern void bfd_elf64_swap_symbol_out 2122 (bfd *, const Elf_Internal_Sym *, void *, void *); 2123 extern void bfd_elf64_swap_reloc_in 2124 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2125 extern void bfd_elf64_swap_reloc_out 2126 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2127 extern void bfd_elf64_swap_reloca_in 2128 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2129 extern void bfd_elf64_swap_reloca_out 2130 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2131 extern void bfd_elf64_swap_phdr_in 2132 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *); 2133 extern void bfd_elf64_swap_phdr_out 2134 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *); 2135 extern void bfd_elf64_swap_dyn_in 2136 (bfd *, const void *, Elf_Internal_Dyn *); 2137 extern void bfd_elf64_swap_dyn_out 2138 (bfd *, const Elf_Internal_Dyn *, void *); 2139 extern long bfd_elf64_slurp_symbol_table 2140 (bfd *, asymbol **, bfd_boolean); 2141 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr 2142 (bfd *); 2143 extern int bfd_elf64_write_out_phdrs 2144 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2145 extern bfd_boolean bfd_elf64_checksum_contents 2146 (bfd * , void (*) (const void *, size_t, void *), void *); 2147 extern void bfd_elf64_write_relocs 2148 (bfd *, asection *, void *); 2149 extern bfd_boolean bfd_elf64_slurp_reloc_table 2150 (bfd *, asection *, asymbol **, bfd_boolean); 2151 2152 extern bfd_boolean _bfd_elf_default_relocs_compatible 2153 (const bfd_target *, const bfd_target *); 2154 2155 extern bfd_boolean _bfd_elf_relocs_compatible 2156 (const bfd_target *, const bfd_target *); 2157 2158 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup 2159 (bfd *, struct bfd_link_info *, const char *); 2160 extern bfd_boolean bfd_elf_link_add_symbols 2161 (bfd *, struct bfd_link_info *); 2162 extern bfd_boolean _bfd_elf_add_dynamic_entry 2163 (struct bfd_link_info *, bfd_vma, bfd_vma); 2164 2165 extern bfd_boolean bfd_elf_link_record_dynamic_symbol 2166 (struct bfd_link_info *, struct elf_link_hash_entry *); 2167 2168 extern int bfd_elf_link_record_local_dynamic_symbol 2169 (struct bfd_link_info *, bfd *, long); 2170 2171 extern bfd_boolean _bfd_elf_close_and_cleanup 2172 (bfd *); 2173 2174 extern bfd_boolean _bfd_elf_common_definition 2175 (Elf_Internal_Sym *); 2176 2177 extern unsigned int _bfd_elf_common_section_index 2178 (asection *); 2179 2180 extern asection *_bfd_elf_common_section 2181 (asection *); 2182 2183 extern bfd_vma _bfd_elf_default_got_elt_size 2184 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *, 2185 unsigned long); 2186 2187 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn 2188 (bfd *, arelent *, struct bfd_symbol *, void *, 2189 asection *, bfd *, char **); 2190 2191 extern bfd_boolean bfd_elf_final_link 2192 (bfd *, struct bfd_link_info *); 2193 2194 extern void _bfd_elf_gc_keep 2195 (struct bfd_link_info *info); 2196 2197 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol 2198 (struct elf_link_hash_entry *h, void *inf); 2199 2200 extern bfd_boolean bfd_elf_gc_sections 2201 (bfd *, struct bfd_link_info *); 2202 2203 extern bfd_boolean bfd_elf_gc_record_vtinherit 2204 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2205 2206 extern bfd_boolean bfd_elf_gc_record_vtentry 2207 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2208 2209 extern asection *_bfd_elf_gc_mark_hook 2210 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 2211 struct elf_link_hash_entry *, Elf_Internal_Sym *); 2212 2213 extern asection *_bfd_elf_gc_mark_rsec 2214 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2215 struct elf_reloc_cookie *); 2216 2217 extern bfd_boolean _bfd_elf_gc_mark_reloc 2218 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2219 struct elf_reloc_cookie *); 2220 2221 extern bfd_boolean _bfd_elf_gc_mark_fdes 2222 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn, 2223 struct elf_reloc_cookie *); 2224 2225 extern bfd_boolean _bfd_elf_gc_mark 2226 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn); 2227 2228 extern bfd_boolean _bfd_elf_gc_mark_extra_sections 2229 (struct bfd_link_info *, elf_gc_mark_hook_fn); 2230 2231 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets 2232 (bfd *, struct bfd_link_info *); 2233 2234 extern bfd_boolean bfd_elf_gc_common_final_link 2235 (bfd *, struct bfd_link_info *); 2236 2237 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p 2238 (bfd_vma, void *); 2239 2240 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment 2241 (bfd *, asection *); 2242 2243 extern bfd_boolean _bfd_elf_map_sections_to_segments 2244 (bfd *, struct bfd_link_info *); 2245 2246 extern bfd_boolean _bfd_elf_is_function_type (unsigned int); 2247 2248 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *, 2249 bfd_vma *); 2250 2251 extern int bfd_elf_get_default_section_type (flagword); 2252 2253 extern bfd_boolean bfd_elf_lookup_section_flags 2254 (struct bfd_link_info *, struct flag_info *, asection *); 2255 2256 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section 2257 (bfd * abfd, asection * section); 2258 2259 /* Exported interface for writing elf corefile notes. */ 2260 extern char *elfcore_write_note 2261 (bfd *, char *, int *, const char *, int, const void *, int); 2262 extern char *elfcore_write_prpsinfo 2263 (bfd *, char *, int *, const char *, const char *); 2264 extern char *elfcore_write_prstatus 2265 (bfd *, char *, int *, long, int, const void *); 2266 extern char * elfcore_write_pstatus 2267 (bfd *, char *, int *, long, int, const void *); 2268 extern char *elfcore_write_prfpreg 2269 (bfd *, char *, int *, const void *, int); 2270 extern char *elfcore_write_prxfpreg 2271 (bfd *, char *, int *, const void *, int); 2272 extern char *elfcore_write_xstatereg 2273 (bfd *, char *, int *, const void *, int); 2274 extern char *elfcore_write_ppc_vmx 2275 (bfd *, char *, int *, const void *, int); 2276 extern char *elfcore_write_ppc_vsx 2277 (bfd *, char *, int *, const void *, int); 2278 extern char *elfcore_write_s390_timer 2279 (bfd *, char *, int *, const void *, int); 2280 extern char *elfcore_write_s390_todcmp 2281 (bfd *, char *, int *, const void *, int); 2282 extern char *elfcore_write_s390_todpreg 2283 (bfd *, char *, int *, const void *, int); 2284 extern char *elfcore_write_s390_ctrs 2285 (bfd *, char *, int *, const void *, int); 2286 extern char *elfcore_write_s390_prefix 2287 (bfd *, char *, int *, const void *, int); 2288 extern char *elfcore_write_s390_last_break 2289 (bfd *, char *, int *, const void *, int); 2290 extern char *elfcore_write_s390_system_call 2291 (bfd *, char *, int *, const void *, int); 2292 extern char *elfcore_write_s390_tdb 2293 (bfd *, char *, int *, const void *, int); 2294 extern char *elfcore_write_arm_vfp 2295 (bfd *, char *, int *, const void *, int); 2296 extern char *elfcore_write_aarch_tls 2297 (bfd *, char *, int *, const void *, int); 2298 extern char *elfcore_write_aarch_hw_break 2299 (bfd *, char *, int *, const void *, int); 2300 extern char *elfcore_write_aarch_hw_watch 2301 (bfd *, char *, int *, const void *, int); 2302 extern char *elfcore_write_lwpstatus 2303 (bfd *, char *, int *, long, int, const void *); 2304 extern char *elfcore_write_register_note 2305 (bfd *, char *, int *, const char *, const void *, int); 2306 2307 /* Internal structure which holds information to be included in the 2308 PRPSINFO section of Linux core files. 2309 2310 This is an "internal" structure in the sense that it should be used 2311 to pass information to BFD (via the `elfcore_write_linux_prpsinfo' 2312 function), so things like endianess shouldn't be an issue. This 2313 structure will eventually be converted in one of the 2314 `elf_external_linux_*' structures and written out to an output bfd 2315 by one of the functions declared below. */ 2316 2317 struct elf_internal_linux_prpsinfo 2318 { 2319 char pr_state; /* Numeric process state. */ 2320 char pr_sname; /* Char for pr_state. */ 2321 char pr_zomb; /* Zombie. */ 2322 char pr_nice; /* Nice val. */ 2323 unsigned long pr_flag; /* Flags. */ 2324 unsigned int pr_uid; 2325 unsigned int pr_gid; 2326 int pr_pid, pr_ppid, pr_pgrp, pr_sid; 2327 char pr_fname[16 + 1]; /* Filename of executable. */ 2328 char pr_psargs[80 + 1]; /* Initial part of arg list. */ 2329 }; 2330 2331 /* Linux/most 32-bit archs. */ 2332 extern char *elfcore_write_linux_prpsinfo32 2333 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2334 2335 /* Linux/most 64-bit archs. */ 2336 extern char *elfcore_write_linux_prpsinfo64 2337 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2338 2339 /* Linux/PPC32 uses different layout compared to most archs. */ 2340 extern char *elfcore_write_ppc_linux_prpsinfo32 2341 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2342 2343 extern bfd *_bfd_elf32_bfd_from_remote_memory 2344 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 2345 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2346 extern bfd *_bfd_elf64_bfd_from_remote_memory 2347 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep, 2348 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2349 2350 extern bfd_vma bfd_elf_obj_attr_size (bfd *); 2351 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma); 2352 extern int bfd_elf_get_obj_attr_int (bfd *, int, int); 2353 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int); 2354 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \ 2355 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2356 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *); 2357 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \ 2358 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2359 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int, 2360 const char *); 2361 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \ 2362 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \ 2363 (INTVAL), (STRVAL)) 2364 2365 extern char *_bfd_elf_attr_strdup (bfd *, const char *); 2366 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *); 2367 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int); 2368 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *); 2369 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *); 2370 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int); 2371 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *); 2372 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec); 2373 2374 /* The linker may need to keep track of the number of relocs that it 2375 decides to copy as dynamic relocs in check_relocs for each symbol. 2376 This is so that it can later discard them if they are found to be 2377 unnecessary. We can store the information in a field extending the 2378 regular ELF linker hash table. */ 2379 2380 struct elf_dyn_relocs 2381 { 2382 struct elf_dyn_relocs *next; 2383 2384 /* The input section of the reloc. */ 2385 asection *sec; 2386 2387 /* Total number of relocs copied for the input section. */ 2388 bfd_size_type count; 2389 2390 /* Number of pc-relative relocs copied for the input section. */ 2391 bfd_size_type pc_count; 2392 }; 2393 2394 extern bfd_boolean _bfd_elf_create_ifunc_sections 2395 (bfd *, struct bfd_link_info *); 2396 extern asection * _bfd_elf_create_ifunc_dyn_reloc 2397 (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc, 2398 struct elf_dyn_relocs **); 2399 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs 2400 (struct bfd_link_info *, struct elf_link_hash_entry *, 2401 struct elf_dyn_relocs **, unsigned int, unsigned int); 2402 2403 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *); 2404 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *); 2405 2406 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma); 2407 extern bfd_vma elf64_r_sym (bfd_vma); 2408 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma); 2409 extern bfd_vma elf32_r_sym (bfd_vma); 2410 2411 /* Large common section. */ 2412 extern asection _bfd_elf_large_com_section; 2413 2414 /* Hash for local symbol with the first section id, ID, in the input 2415 file and the local symbol index, SYM. */ 2416 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \ 2417 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \ 2418 ^ (SYM) ^ ((ID) >> 16)) 2419 2420 /* This is the condition under which finish_dynamic_symbol will be called. 2421 If our finish_dynamic_symbol isn't called, we'll need to do something 2422 about initializing any .plt and .got entries in relocate_section. */ 2423 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ 2424 ((DYN) \ 2425 && ((SHARED) || !(H)->forced_local) \ 2426 && ((H)->dynindx != -1 || (H)->forced_local)) 2427 2428 /* This macro is to avoid lots of duplicated code in the body 2429 of xxx_relocate_section() in the various elfxx-xxxx.c files. */ 2430 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \ 2431 r_symndx, symtab_hdr, sym_hashes, \ 2432 h, sec, relocation, \ 2433 unresolved_reloc, warned) \ 2434 do \ 2435 { \ 2436 /* It seems this can happen with erroneous or unsupported \ 2437 input (mixing a.out and elf in an archive, for example.) */ \ 2438 if (sym_hashes == NULL) \ 2439 return FALSE; \ 2440 \ 2441 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \ 2442 \ 2443 while (h->root.type == bfd_link_hash_indirect \ 2444 || h->root.type == bfd_link_hash_warning) \ 2445 h = (struct elf_link_hash_entry *) h->root.u.i.link; \ 2446 \ 2447 warned = FALSE; \ 2448 unresolved_reloc = FALSE; \ 2449 relocation = 0; \ 2450 if (h->root.type == bfd_link_hash_defined \ 2451 || h->root.type == bfd_link_hash_defweak) \ 2452 { \ 2453 sec = h->root.u.def.section; \ 2454 if (sec == NULL \ 2455 || sec->output_section == NULL) \ 2456 /* Set a flag that will be cleared later if we find a \ 2457 relocation value for this symbol. output_section \ 2458 is typically NULL for symbols satisfied by a shared \ 2459 library. */ \ 2460 unresolved_reloc = TRUE; \ 2461 else \ 2462 relocation = (h->root.u.def.value \ 2463 + sec->output_section->vma \ 2464 + sec->output_offset); \ 2465 } \ 2466 else if (h->root.type == bfd_link_hash_undefweak) \ 2467 ; \ 2468 else if (info->unresolved_syms_in_objects == RM_IGNORE \ 2469 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \ 2470 ; \ 2471 else if (!info->relocatable) \ 2472 { \ 2473 bfd_boolean err; \ 2474 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \ 2475 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \ 2476 if (!info->callbacks->undefined_symbol (info, \ 2477 h->root.root.string, \ 2478 input_bfd, \ 2479 input_section, \ 2480 rel->r_offset, err)) \ 2481 return FALSE; \ 2482 warned = TRUE; \ 2483 } \ 2484 (void) unresolved_reloc; \ 2485 (void) warned; \ 2486 } \ 2487 while (0) 2488 2489 /* This macro is to avoid lots of duplicated code in the body of the 2490 loop over relocations in xxx_relocate_section() in the various 2491 elfxx-xxxx.c files. 2492 2493 Handle relocations against symbols from removed linkonce sections, 2494 or sections discarded by a linker script. When doing a relocatable 2495 link, we remove such relocations. Otherwise, we just want the 2496 section contents zeroed and avoid any special processing. */ 2497 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \ 2498 rel, count, relend, \ 2499 howto, index, contents) \ 2500 { \ 2501 int i_; \ 2502 _bfd_clear_contents (howto, input_bfd, input_section, \ 2503 contents + rel[index].r_offset); \ 2504 \ 2505 if (info->relocatable \ 2506 && (input_section->flags & SEC_DEBUGGING)) \ 2507 { \ 2508 /* Only remove relocations in debug sections since other \ 2509 sections may require relocations. */ \ 2510 Elf_Internal_Shdr *rel_hdr; \ 2511 \ 2512 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \ 2513 \ 2514 /* Avoid empty output section. */ \ 2515 if (rel_hdr->sh_size > count * rel_hdr->sh_entsize) \ 2516 { \ 2517 rel_hdr->sh_size -= count * rel_hdr->sh_entsize; \ 2518 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \ 2519 rel_hdr->sh_size -= count * rel_hdr->sh_entsize; \ 2520 \ 2521 memmove (rel, rel + count, \ 2522 (relend - rel - count) * sizeof (*rel)); \ 2523 \ 2524 input_section->reloc_count -= count; \ 2525 relend -= count; \ 2526 rel--; \ 2527 continue; \ 2528 } \ 2529 } \ 2530 \ 2531 for (i_ = 0; i_ < count; i_++) \ 2532 { \ 2533 rel[i_].r_info = 0; \ 2534 rel[i_].r_addend = 0; \ 2535 } \ 2536 rel += count - 1; \ 2537 continue; \ 2538 } 2539 2540 /* Will a symbol be bound to the definition within the shared 2541 library, if any. A unique symbol can never be bound locally. */ 2542 #define SYMBOLIC_BIND(INFO, H) \ 2543 (!(H)->unique_global \ 2544 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))) 2545 2546 #endif /* _LIBELF_H_ */ 2547