1 /* BFD back-end data structures for ELF files. 2 Copyright (C) 1992-2020 Free Software Foundation, Inc. 3 Written by Cygnus Support. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #ifndef _LIBELF_H_ 23 #define _LIBELF_H_ 1 24 25 #include "elf/common.h" 26 #include "elf/external.h" 27 #include "elf/internal.h" 28 #include "bfdlink.h" 29 30 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 /* The number of entries in a section is its size divided by the size 35 of a single entry. This is normally only applicable to reloc and 36 symbol table sections. 37 PR 9934: It is possible to have relocations that do not refer to 38 symbols, thus it is also possible to have a relocation section in 39 an object file, but no symbol table. */ 40 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0) 41 42 /* If size isn't specified as 64 or 32, NAME macro should fail. */ 43 #ifndef NAME 44 #if ARCH_SIZE == 64 45 #define NAME(x, y) x ## 64 ## _ ## y 46 #endif 47 #if ARCH_SIZE == 32 48 #define NAME(x, y) x ## 32 ## _ ## y 49 #endif 50 #endif 51 52 #ifndef NAME 53 #define NAME(x, y) x ## NOSIZE ## _ ## y 54 #endif 55 56 #define ElfNAME(X) NAME(Elf,X) 57 #define elfNAME(X) NAME(elf,X) 58 59 /* Information held for an ELF symbol. The first field is the 60 corresponding asymbol. Every symbol is an ELF file is actually a 61 pointer to this structure, although it is often handled as a 62 pointer to an asymbol. */ 63 64 typedef struct 65 { 66 /* The BFD symbol. */ 67 asymbol symbol; 68 /* ELF symbol information. */ 69 Elf_Internal_Sym internal_elf_sym; 70 /* Backend specific information. */ 71 union 72 { 73 unsigned int hppa_arg_reloc; 74 void *mips_extr; 75 void *any; 76 } 77 tc_data; 78 79 /* Version information. This is from an Elf_Internal_Versym 80 structure in a SHT_GNU_versym section. It is zero if there is no 81 version information. */ 82 unsigned short version; 83 84 } elf_symbol_type; 85 86 struct elf_strtab_hash; 87 struct got_entry; 88 struct plt_entry; 89 90 union gotplt_union 91 { 92 bfd_signed_vma refcount; 93 bfd_vma offset; 94 struct got_entry *glist; 95 struct plt_entry *plist; 96 }; 97 98 struct elf_link_virtual_table_entry 99 { 100 /* Virtual table entry use information. This array is nominally of size 101 size/sizeof(target_void_pointer), though we have to be able to assume 102 and track a size while the symbol is still undefined. It is indexed 103 via offset/sizeof(target_void_pointer). */ 104 size_t size; 105 bfd_boolean *used; 106 107 /* Virtual table derivation info. */ 108 struct elf_link_hash_entry *parent; 109 }; 110 111 /* ELF symbol version. */ 112 enum elf_symbol_version 113 { 114 unknown = 0, 115 unversioned, 116 versioned, 117 versioned_hidden 118 }; 119 120 /* ELF linker hash table entries. */ 121 122 struct elf_link_hash_entry 123 { 124 struct bfd_link_hash_entry root; 125 126 /* Symbol index in output file. This is initialized to -1. It is 127 set to -2 if the symbol is used by a reloc. It is set to -3 if 128 this symbol is defined in a discarded section. */ 129 long indx; 130 131 /* Symbol index as a dynamic symbol. Initialized to -1, and remains 132 -1 if this is not a dynamic symbol. */ 133 /* ??? Note that this is consistently used as a synonym for tests 134 against whether we can perform various simplifying transformations 135 to the code. (E.g. changing a pc-relative jump to a PLT entry 136 into a pc-relative jump to the target function.) That test, which 137 is often relatively complex, and someplaces wrong or incomplete, 138 should really be replaced by a predicate in elflink.c. 139 140 End result: this field -1 does not indicate that the symbol is 141 not in the dynamic symbol table, but rather that the symbol is 142 not visible outside this DSO. */ 143 long dynindx; 144 145 /* If this symbol requires an entry in the global offset table, the 146 processor specific backend uses this field to track usage and 147 final offset. Two schemes are supported: The first assumes that 148 a symbol may only have one GOT entry, and uses REFCOUNT until 149 size_dynamic_sections, at which point the contents of the .got is 150 fixed. Afterward, if OFFSET is -1, then the symbol does not 151 require a global offset table entry. The second scheme allows 152 multiple GOT entries per symbol, managed via a linked list 153 pointed to by GLIST. */ 154 union gotplt_union got; 155 156 /* Same, but tracks a procedure linkage table entry. */ 157 union gotplt_union plt; 158 159 /* Symbol size. */ 160 bfd_size_type size; 161 162 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */ 163 unsigned int type : 8; 164 165 /* Symbol st_other value, symbol visibility. */ 166 unsigned int other : 8; 167 168 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */ 169 unsigned int target_internal : 8; 170 171 /* Symbol is referenced by a non-shared object (other than the object 172 in which it is defined). */ 173 unsigned int ref_regular : 1; 174 /* Symbol is defined by a non-shared object. */ 175 unsigned int def_regular : 1; 176 /* Symbol is referenced by a shared object. */ 177 unsigned int ref_dynamic : 1; 178 /* Symbol is defined by a shared object. */ 179 unsigned int def_dynamic : 1; 180 /* Symbol has a non-weak reference from a non-shared object (other than 181 the object in which it is defined). */ 182 unsigned int ref_regular_nonweak : 1; 183 /* Dynamic symbol has been adjustd. */ 184 unsigned int dynamic_adjusted : 1; 185 /* Symbol needs a copy reloc. */ 186 unsigned int needs_copy : 1; 187 /* Symbol needs a procedure linkage table entry. */ 188 unsigned int needs_plt : 1; 189 /* Symbol appears in a non-ELF input file. */ 190 unsigned int non_elf : 1; 191 /* Symbol version information. */ 192 ENUM_BITFIELD (elf_symbol_version) versioned : 2; 193 /* Symbol was forced to local scope due to a version script file. */ 194 unsigned int forced_local : 1; 195 /* Symbol was forced to be dynamic due to a version script file. */ 196 unsigned int dynamic : 1; 197 /* Symbol was marked during garbage collection. */ 198 unsigned int mark : 1; 199 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is 200 not currently set by all the backends. */ 201 unsigned int non_got_ref : 1; 202 /* Symbol has a definition in a shared object. 203 FIXME: There is no real need for this field if def_dynamic is never 204 cleared and all places that test def_dynamic also test def_regular. */ 205 unsigned int dynamic_def : 1; 206 /* Symbol has a non-weak reference from a shared object. */ 207 unsigned int ref_dynamic_nonweak : 1; 208 /* Symbol is referenced with a relocation where C/C++ pointer equality 209 matters. */ 210 unsigned int pointer_equality_needed : 1; 211 /* Symbol is a unique global symbol. */ 212 unsigned int unique_global : 1; 213 /* Symbol is defined by a shared library with non-default visibility 214 in a read/write section. */ 215 unsigned int protected_def : 1; 216 /* Symbol is __start_SECNAME or __stop_SECNAME to mark section 217 SECNAME. */ 218 unsigned int start_stop : 1; 219 /* Symbol is or was a weak defined symbol from a dynamic object with 220 a strong defined symbol alias. U.ALIAS points to a list of aliases, 221 the definition having is_weakalias clear. */ 222 unsigned int is_weakalias : 1; 223 224 /* String table index in .dynstr if this is a dynamic symbol. */ 225 unsigned long dynstr_index; 226 227 union 228 { 229 /* Points to a circular list of non-function symbol aliases. */ 230 struct elf_link_hash_entry *alias; 231 232 /* Hash value of the name computed using the ELF hash function. 233 Used part way through size_dynamic_sections, after we've finished 234 with aliases. */ 235 unsigned long elf_hash_value; 236 } u; 237 238 /* Version information. */ 239 union 240 { 241 /* This field is used for a symbol which is not defined in a 242 regular object. It points to the version information read in 243 from the dynamic object. */ 244 Elf_Internal_Verdef *verdef; 245 /* This field is used for a symbol which is defined in a regular 246 object. It is set up in size_dynamic_sections. It points to 247 the version information we should write out for this symbol. */ 248 struct bfd_elf_version_tree *vertree; 249 } verinfo; 250 251 union 252 { 253 /* For __start_SECNAME and __stop_SECNAME symbols, record the first 254 input section whose section name is SECNAME. */ 255 asection *start_stop_section; 256 257 /* Vtable information. */ 258 struct elf_link_virtual_table_entry *vtable; 259 } u2; 260 }; 261 262 /* Return the strong definition for a weak symbol with aliases. */ 263 264 static inline struct elf_link_hash_entry * 265 weakdef (struct elf_link_hash_entry *h) 266 { 267 while (h->is_weakalias) 268 h = h->u.alias; 269 return h; 270 } 271 272 /* Will references to this symbol always reference the symbol 273 in this object? */ 274 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \ 275 _bfd_elf_symbol_refs_local_p (H, INFO, 0) 276 277 /* Will _calls_ to this symbol always call the version in this object? */ 278 #define SYMBOL_CALLS_LOCAL(INFO, H) \ 279 _bfd_elf_symbol_refs_local_p (H, INFO, 1) 280 281 /* Whether an undefined weak symbol should resolve to its link-time 282 value, even in PIC or PIE objects. */ 283 #define UNDEFWEAK_NO_DYNAMIC_RELOC(INFO, H) \ 284 ((H)->root.type == bfd_link_hash_undefweak \ 285 && (ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT \ 286 || (INFO)->dynamic_undefined_weak == 0)) 287 288 /* Common symbols that are turned into definitions don't have the 289 DEF_REGULAR flag set, so they might appear to be undefined. 290 Symbols defined in linker scripts also don't have DEF_REGULAR set. */ 291 #define ELF_COMMON_DEF_P(H) \ 292 (!(H)->def_regular \ 293 && !(H)->def_dynamic \ 294 && (H)->root.type == bfd_link_hash_defined) 295 296 /* Records local symbols to be emitted in the dynamic symbol table. */ 297 298 struct elf_link_local_dynamic_entry 299 { 300 struct elf_link_local_dynamic_entry *next; 301 302 /* The input bfd this symbol came from. */ 303 bfd *input_bfd; 304 305 /* The index of the local symbol being copied. */ 306 long input_indx; 307 308 /* The index in the outgoing dynamic symbol table. */ 309 long dynindx; 310 311 /* A copy of the input symbol. */ 312 Elf_Internal_Sym isym; 313 }; 314 315 struct elf_link_loaded_list 316 { 317 struct elf_link_loaded_list *next; 318 bfd *abfd; 319 }; 320 321 /* Structures used by the eh_frame optimization code. */ 322 struct eh_cie_fde 323 { 324 union { 325 struct { 326 /* If REMOVED == 1, this is the CIE that the FDE originally used. 327 The CIE belongs to the same .eh_frame input section as the FDE. 328 329 If REMOVED == 0, this is the CIE that we have chosen to use for 330 the output FDE. The CIE's REMOVED field is also 0, but the CIE 331 might belong to a different .eh_frame input section from the FDE. 332 333 May be NULL to signify that the FDE should be discarded. */ 334 struct eh_cie_fde *cie_inf; 335 struct eh_cie_fde *next_for_section; 336 } fde; 337 struct { 338 /* CIEs have three states: 339 340 - REMOVED && !MERGED: Slated for removal because we haven't yet 341 proven that an FDE needs it. FULL_CIE, if nonnull, points to 342 more detailed information about the CIE. 343 344 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH, 345 which may not belong to the same input section. 346 347 - !REMOVED: We have decided to keep this CIE. SEC is the 348 .eh_frame input section that contains the CIE. */ 349 union { 350 struct cie *full_cie; 351 struct eh_cie_fde *merged_with; 352 asection *sec; 353 } u; 354 355 /* The offset of the personality data from the start of the CIE, 356 or 0 if the CIE doesn't have any. */ 357 unsigned int personality_offset : 8; 358 359 /* Length of augmentation. aug_str_len is the length of the 360 string including null terminator. aug_data_len is the length 361 of the rest up to the initial insns. */ 362 unsigned int aug_str_len : 3; 363 unsigned int aug_data_len : 5; 364 365 /* True if we have marked relocations associated with this CIE. */ 366 unsigned int gc_mark : 1; 367 368 /* True if we have decided to turn an absolute LSDA encoding into 369 a PC-relative one. */ 370 unsigned int make_lsda_relative : 1; 371 372 /* True if we have decided to turn an absolute personality 373 encoding into a PC-relative one. */ 374 unsigned int make_per_encoding_relative : 1; 375 376 /* True if the CIE contains personality data and if that 377 data uses a PC-relative encoding. Always true when 378 make_per_encoding_relative is. */ 379 unsigned int per_encoding_relative : 1; 380 381 /* True if the CIE contains personality data aligned to a 382 multiple of eight bytes. */ 383 unsigned int per_encoding_aligned8 : 1; 384 385 /* True if we need to add an 'R' (FDE encoding) entry to the 386 CIE's augmentation data. */ 387 unsigned int add_fde_encoding : 1; 388 389 /* True if we have merged this CIE with another. */ 390 unsigned int merged : 1; 391 392 /* Unused bits. */ 393 unsigned int pad1 : 9; 394 } cie; 395 } u; 396 unsigned int reloc_index; 397 unsigned int size; 398 unsigned int offset; 399 unsigned int new_offset; 400 unsigned int fde_encoding : 8; 401 unsigned int lsda_encoding : 8; 402 unsigned int lsda_offset : 8; 403 404 /* True if this entry represents a CIE, false if it represents an FDE. */ 405 unsigned int cie : 1; 406 407 /* True if this entry is currently marked for removal. */ 408 unsigned int removed : 1; 409 410 /* True if we need to add a 'z' (augmentation size) entry to the CIE's 411 augmentation data, and an associated byte to each of the CIE's FDEs. */ 412 unsigned int add_augmentation_size : 1; 413 414 /* True if we have decided to convert absolute FDE relocations into 415 relative ones. This applies to the first relocation in the FDE, 416 which is against the code that the FDE describes. */ 417 unsigned int make_relative : 1; 418 419 /* Unused bits. */ 420 unsigned int pad1 : 4; 421 422 unsigned int *set_loc; 423 }; 424 425 struct eh_frame_sec_info 426 { 427 unsigned int count; 428 struct cie *cies; 429 struct eh_cie_fde entry[1]; 430 }; 431 432 struct eh_frame_array_ent 433 { 434 bfd_vma initial_loc; 435 bfd_size_type range; 436 bfd_vma fde; 437 }; 438 439 struct htab; 440 441 #define DWARF2_EH_HDR 1 442 #define COMPACT_EH_HDR 2 443 444 /* Endian-neutral code indicating that a function cannot be unwound. */ 445 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01 446 447 struct dwarf_eh_frame_hdr_info 448 { 449 struct htab *cies; 450 unsigned int fde_count; 451 /* TRUE if .eh_frame_hdr should contain the sorted search table. 452 We build it if we successfully read all .eh_frame input sections 453 and recognize them. */ 454 bfd_boolean table; 455 struct eh_frame_array_ent *array; 456 }; 457 458 struct compact_eh_frame_hdr_info 459 { 460 unsigned int allocated_entries; 461 /* eh_frame_entry fragments. */ 462 asection **entries; 463 }; 464 465 struct eh_frame_hdr_info 466 { 467 asection *hdr_sec; 468 unsigned int array_count; 469 bfd_boolean frame_hdr_is_compact; 470 union 471 { 472 struct dwarf_eh_frame_hdr_info dwarf; 473 struct compact_eh_frame_hdr_info compact; 474 } 475 u; 476 }; 477 478 /* Enum used to identify target specific extensions to the elf_obj_tdata 479 and elf_link_hash_table structures. Note the enums deliberately start 480 from 1 so that we can detect an uninitialized field. The generic value 481 is last so that additions to this enum do not need to modify more than 482 one line. */ 483 enum elf_target_id 484 { 485 AARCH64_ELF_DATA = 1, 486 ALPHA_ELF_DATA, 487 ARC_ELF_DATA, 488 ARM_ELF_DATA, 489 AVR_ELF_DATA, 490 BFIN_ELF_DATA, 491 CRIS_ELF_DATA, 492 CSKY_ELF_DATA, 493 FRV_ELF_DATA, 494 HPPA32_ELF_DATA, 495 HPPA64_ELF_DATA, 496 I386_ELF_DATA, 497 IA64_ELF_DATA, 498 LM32_ELF_DATA, 499 M32R_ELF_DATA, 500 M68HC11_ELF_DATA, 501 M68K_ELF_DATA, 502 METAG_ELF_DATA, 503 MICROBLAZE_ELF_DATA, 504 MIPS_ELF_DATA, 505 MN10300_ELF_DATA, 506 NDS32_ELF_DATA, 507 NIOS2_ELF_DATA, 508 OR1K_ELF_DATA, 509 PPC32_ELF_DATA, 510 PPC64_ELF_DATA, 511 PRU_ELF_DATA, 512 S390_ELF_DATA, 513 SH_ELF_DATA, 514 SPARC_ELF_DATA, 515 SPU_ELF_DATA, 516 TIC6X_ELF_DATA, 517 X86_64_ELF_DATA, 518 XTENSA_ELF_DATA, 519 TILEGX_ELF_DATA, 520 TILEPRO_ELF_DATA, 521 RISCV_ELF_DATA, 522 GENERIC_ELF_DATA 523 }; 524 525 struct elf_sym_strtab 526 { 527 Elf_Internal_Sym sym; 528 unsigned long dest_index; 529 unsigned long destshndx_index; 530 }; 531 532 struct bfd_link_needed_list 533 { 534 struct bfd_link_needed_list *next; 535 bfd *by; 536 const char *name; 537 }; 538 539 /* ELF linker hash table. */ 540 541 struct elf_link_hash_table 542 { 543 struct bfd_link_hash_table root; 544 545 /* An identifier used to distinguish different target 546 specific extensions to this structure. */ 547 enum elf_target_id hash_table_id; 548 549 /* Whether we have created the special dynamic sections required 550 when linking against or generating a shared object. */ 551 bfd_boolean dynamic_sections_created; 552 553 /* Whether dynamic relocations are present. */ 554 bfd_boolean dynamic_relocs; 555 556 /* True if this target has relocatable executables, so needs dynamic 557 section symbols. */ 558 bfd_boolean is_relocatable_executable; 559 560 /* The BFD used to hold special sections created by the linker. 561 This will be the first BFD found which requires these sections to 562 be created. */ 563 bfd *dynobj; 564 565 /* The value to use when initialising got.refcount/offset and 566 plt.refcount/offset in an elf_link_hash_entry. Set to zero when 567 the values are refcounts. Set to init_got_offset/init_plt_offset 568 in size_dynamic_sections when the values may be offsets. */ 569 union gotplt_union init_got_refcount; 570 union gotplt_union init_plt_refcount; 571 572 /* The value to use for got.refcount/offset and plt.refcount/offset 573 when the values may be offsets. Normally (bfd_vma) -1. */ 574 union gotplt_union init_got_offset; 575 union gotplt_union init_plt_offset; 576 577 /* The number of symbols found in the link which is intended for the 578 mandatory DT_SYMTAB tag (.dynsym section) in .dynamic section. */ 579 bfd_size_type dynsymcount; 580 bfd_size_type local_dynsymcount; 581 582 /* The string table of dynamic symbols, which becomes the .dynstr 583 section. */ 584 struct elf_strtab_hash *dynstr; 585 586 /* The number of symbol strings found in the link which must be put 587 into the .strtab section. */ 588 bfd_size_type strtabcount; 589 590 /* The array size of the symbol string table, which becomes the 591 .strtab section. */ 592 bfd_size_type strtabsize; 593 594 /* The array of strings, which becomes the .strtab section. */ 595 struct elf_sym_strtab *strtab; 596 597 /* The number of buckets in the hash table in the .hash section. 598 This is based on the number of dynamic symbols. */ 599 bfd_size_type bucketcount; 600 601 /* A linked list of DT_NEEDED names found in dynamic objects 602 included in the link. */ 603 struct bfd_link_needed_list *needed; 604 605 /* Sections in the output bfd that provides a section symbol 606 to be used by relocations emitted against local symbols. 607 Most targets will not use data_index_section. */ 608 asection *text_index_section; 609 asection *data_index_section; 610 611 /* The _GLOBAL_OFFSET_TABLE_ symbol. */ 612 struct elf_link_hash_entry *hgot; 613 614 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */ 615 struct elf_link_hash_entry *hplt; 616 617 /* The _DYNAMIC symbol. */ 618 struct elf_link_hash_entry *hdynamic; 619 620 /* A pointer to information used to merge SEC_MERGE sections. */ 621 void *merge_info; 622 623 /* Used to link stabs in sections. */ 624 struct stab_info stab_info; 625 626 /* Used by eh_frame code when editing .eh_frame. */ 627 struct eh_frame_hdr_info eh_info; 628 629 /* A linked list of local symbols to be added to .dynsym. */ 630 struct elf_link_local_dynamic_entry *dynlocal; 631 632 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic 633 objects included in the link. */ 634 struct bfd_link_needed_list *runpath; 635 636 /* Cached first output tls section and size of PT_TLS segment. */ 637 asection *tls_sec; 638 bfd_size_type tls_size; 639 640 /* A linked list of BFD's loaded in the link. */ 641 struct elf_link_loaded_list *loaded; 642 643 /* Short-cuts to get to dynamic linker sections. */ 644 asection *sgot; 645 asection *sgotplt; 646 asection *srelgot; 647 asection *splt; 648 asection *srelplt; 649 asection *sdynbss; 650 asection *srelbss; 651 asection *sdynrelro; 652 asection *sreldynrelro; 653 asection *igotplt; 654 asection *iplt; 655 asection *irelplt; 656 asection *irelifunc; 657 asection *dynsym; 658 }; 659 660 /* Look up an entry in an ELF linker hash table. */ 661 662 #define elf_link_hash_lookup(table, string, create, copy, follow) \ 663 ((struct elf_link_hash_entry *) \ 664 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 665 (copy), (follow))) 666 667 /* Traverse an ELF linker hash table. */ 668 669 #define elf_link_hash_traverse(table, func, info) \ 670 (bfd_link_hash_traverse \ 671 (&(table)->root, \ 672 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 673 (info))) 674 675 /* Get the ELF linker hash table from a link_info structure. */ 676 677 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash)) 678 679 #define elf_hash_table_id(table) ((table) -> hash_table_id) 680 681 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */ 682 #define is_elf_hash_table(htab) \ 683 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table) 684 685 /* Used by bfd_sym_from_r_symndx to cache a small number of local 686 symbols. */ 687 #define LOCAL_SYM_CACHE_SIZE 32 688 struct sym_cache 689 { 690 bfd *abfd; 691 unsigned long indx[LOCAL_SYM_CACHE_SIZE]; 692 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE]; 693 }; 694 695 /* Constant information held for an ELF backend. */ 696 697 struct elf_size_info { 698 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr; 699 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note; 700 701 /* The size of entries in the .hash section. */ 702 unsigned char sizeof_hash_entry; 703 704 /* The number of internal relocations to allocate per external 705 relocation entry. */ 706 unsigned char int_rels_per_ext_rel; 707 /* We use some fixed size arrays. This should be large enough to 708 handle all back-ends. */ 709 #define MAX_INT_RELS_PER_EXT_REL 3 710 711 unsigned char arch_size, log_file_align; 712 unsigned char elfclass, ev_current; 713 int (*write_out_phdrs) 714 (bfd *, const Elf_Internal_Phdr *, unsigned int); 715 bfd_boolean 716 (*write_shdrs_and_ehdr) (bfd *); 717 bfd_boolean (*checksum_contents) 718 (bfd * , void (*) (const void *, size_t, void *), void *); 719 void (*write_relocs) 720 (bfd *, asection *, void *); 721 bfd_boolean (*swap_symbol_in) 722 (bfd *, const void *, const void *, Elf_Internal_Sym *); 723 void (*swap_symbol_out) 724 (bfd *, const Elf_Internal_Sym *, void *, void *); 725 bfd_boolean (*slurp_reloc_table) 726 (bfd *, asection *, asymbol **, bfd_boolean); 727 long (*slurp_symbol_table) 728 (bfd *, asymbol **, bfd_boolean); 729 void (*swap_dyn_in) 730 (bfd *, const void *, Elf_Internal_Dyn *); 731 void (*swap_dyn_out) 732 (bfd *, const Elf_Internal_Dyn *, void *); 733 734 /* This function is called to swap in a REL relocation. If an 735 external relocation corresponds to more than one internal 736 relocation, then all relocations are swapped in at once. */ 737 void (*swap_reloc_in) 738 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 739 740 /* This function is called to swap out a REL relocation. */ 741 void (*swap_reloc_out) 742 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 743 744 /* This function is called to swap in a RELA relocation. If an 745 external relocation corresponds to more than one internal 746 relocation, then all relocations are swapped in at once. */ 747 void (*swap_reloca_in) 748 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 749 750 /* This function is called to swap out a RELA relocation. */ 751 void (*swap_reloca_out) 752 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 753 }; 754 755 #define elf_symbol_from(ABFD,S) \ 756 (((S)->the_bfd != NULL \ 757 && (S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \ 758 && (S)->the_bfd->tdata.elf_obj_data != 0) \ 759 ? (elf_symbol_type *) (S) \ 760 : 0) 761 762 enum elf_reloc_type_class { 763 reloc_class_normal, 764 reloc_class_relative, 765 reloc_class_copy, 766 reloc_class_ifunc, 767 reloc_class_plt 768 }; 769 770 struct elf_reloc_cookie 771 { 772 Elf_Internal_Rela *rels, *rel, *relend; 773 Elf_Internal_Sym *locsyms; 774 bfd *abfd; 775 size_t locsymcount; 776 size_t extsymoff; 777 struct elf_link_hash_entry **sym_hashes; 778 int r_sym_shift; 779 bfd_boolean bad_symtab; 780 }; 781 782 /* The level of IRIX compatibility we're striving for. */ 783 784 typedef enum { 785 ict_none, 786 ict_irix5, 787 ict_irix6 788 } irix_compat_t; 789 790 /* Mapping of ELF section names and types. */ 791 struct bfd_elf_special_section 792 { 793 const char *prefix; 794 unsigned int prefix_length; 795 /* 0 means name must match PREFIX exactly. 796 -1 means name must start with PREFIX followed by an arbitrary string. 797 -2 means name must match PREFIX exactly or consist of PREFIX followed 798 by a dot then anything. 799 > 0 means name must start with the first PREFIX_LENGTH chars of 800 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */ 801 signed int suffix_length; 802 unsigned int type; 803 bfd_vma attr; 804 }; 805 806 enum action_discarded 807 { 808 COMPLAIN = 1, 809 PRETEND = 2 810 }; 811 812 typedef asection * (*elf_gc_mark_hook_fn) 813 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 814 struct elf_link_hash_entry *, Elf_Internal_Sym *); 815 816 enum elf_property_kind 817 { 818 /* A new property. */ 819 property_unknown = 0, 820 /* A property ignored by backend. */ 821 property_ignored, 822 /* A corrupt property reported by backend. */ 823 property_corrupt, 824 /* A property should be removed due to property merge. */ 825 property_remove, 826 /* A property which is a number. */ 827 property_number 828 }; 829 830 typedef struct elf_property 831 { 832 unsigned int pr_type; 833 unsigned int pr_datasz; 834 union 835 { 836 /* For property_number, this is a number. */ 837 bfd_vma number; 838 /* Add a new one if elf_property_kind is updated. */ 839 } u; 840 enum elf_property_kind pr_kind; 841 } elf_property; 842 843 typedef struct elf_property_list 844 { 845 struct elf_property_list *next; 846 struct elf_property property; 847 } elf_property_list; 848 849 struct bfd_elf_section_reloc_data; 850 851 struct elf_backend_data 852 { 853 /* The architecture for this backend. */ 854 enum bfd_architecture arch; 855 856 /* An identifier used to distinguish different target specific 857 extensions to elf_obj_tdata and elf_link_hash_table structures. */ 858 enum elf_target_id target_id; 859 860 /* The ELF machine code (EM_xxxx) for this backend. */ 861 int elf_machine_code; 862 863 /* EI_OSABI. */ 864 int elf_osabi; 865 866 /* The maximum page size for this backend. */ 867 bfd_vma maxpagesize; 868 869 /* The minimum page size for this backend. An input object will not be 870 considered page aligned unless its sections are correctly aligned for 871 pages at least this large. May be smaller than maxpagesize. */ 872 bfd_vma minpagesize; 873 874 /* The common page size for this backend. */ 875 bfd_vma commonpagesize; 876 877 /* The value of commonpagesize to use when -z relro for this backend. */ 878 bfd_vma relropagesize; 879 880 /* The BFD flags applied to sections created for dynamic linking. */ 881 flagword dynamic_sec_flags; 882 883 /* Architecture-specific data for this backend. 884 This is actually a pointer to some type like struct elf_ARCH_data. */ 885 const void *arch_data; 886 887 /* A function to translate an ELF RELA relocation to a BFD arelent 888 structure. Returns TRUE upon success, FALSE otherwise. */ 889 bfd_boolean (*elf_info_to_howto) 890 (bfd *, arelent *, Elf_Internal_Rela *); 891 892 /* A function to translate an ELF REL relocation to a BFD arelent 893 structure. Returns TRUE upon success, FALSE otherwise. */ 894 bfd_boolean (*elf_info_to_howto_rel) 895 (bfd *, arelent *, Elf_Internal_Rela *); 896 897 /* A function to determine whether a symbol is global when 898 partitioning the symbol table into local and global symbols. 899 This should be NULL for most targets, in which case the correct 900 thing will be done. MIPS ELF, at least on the Irix 5, has 901 special requirements. */ 902 bfd_boolean (*elf_backend_sym_is_global) 903 (bfd *, asymbol *); 904 905 /* The remaining functions are hooks which are called only if they 906 are not NULL. */ 907 908 /* A function to permit a backend specific check on whether a 909 particular BFD format is relevant for an object file, and to 910 permit the backend to set any global information it wishes. When 911 this is called elf_elfheader is set, but anything else should be 912 used with caution. If this returns FALSE, the check_format 913 routine will return a bfd_error_wrong_format error. */ 914 bfd_boolean (*elf_backend_object_p) 915 (bfd *); 916 917 /* A function to do additional symbol processing when reading the 918 ELF symbol table. This is where any processor-specific special 919 section indices are handled. */ 920 void (*elf_backend_symbol_processing) 921 (bfd *, asymbol *); 922 923 /* A function to do additional symbol processing after reading the 924 entire ELF symbol table. */ 925 bfd_boolean (*elf_backend_symbol_table_processing) 926 (bfd *, elf_symbol_type *, unsigned int); 927 928 /* A function to set the type of the info field. Processor-specific 929 types should be handled here. */ 930 int (*elf_backend_get_symbol_type) 931 (Elf_Internal_Sym *, int); 932 933 /* A function to return the linker hash table entry of a symbol that 934 might be satisfied by an archive symbol. */ 935 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup) 936 (bfd *, struct bfd_link_info *, const char *); 937 938 /* Return true if local section symbols should have a non-null st_name. 939 NULL implies false. */ 940 bfd_boolean (*elf_backend_name_local_section_symbols) 941 (bfd *); 942 943 /* A function to do additional processing on the ELF section header 944 just before writing it out. This is used to set the flags and 945 type fields for some sections, or to actually write out data for 946 unusual sections. */ 947 bfd_boolean (*elf_backend_section_processing) 948 (bfd *, Elf_Internal_Shdr *); 949 950 /* A function to handle unusual section types when creating BFD 951 sections from ELF sections. */ 952 bfd_boolean (*elf_backend_section_from_shdr) 953 (bfd *, Elf_Internal_Shdr *, const char *, int); 954 955 /* A function to convert machine dependent ELF section header flags to 956 BFD internal section header flags. */ 957 bfd_boolean (*elf_backend_section_flags) 958 (flagword *, const Elf_Internal_Shdr *); 959 960 /* A function that returns a struct containing ELF section flags and 961 type for the given BFD section. */ 962 const struct bfd_elf_special_section * (*get_sec_type_attr) 963 (bfd *, asection *); 964 965 /* A function to handle unusual program segment types when creating BFD 966 sections from ELF program segments. */ 967 bfd_boolean (*elf_backend_section_from_phdr) 968 (bfd *, Elf_Internal_Phdr *, int, const char *); 969 970 /* A function to set up the ELF section header for a BFD section in 971 preparation for writing it out. This is where the flags and type 972 fields are set for unusual sections. */ 973 bfd_boolean (*elf_backend_fake_sections) 974 (bfd *, Elf_Internal_Shdr *, asection *); 975 976 /* A function to get the ELF section index for a BFD section. If 977 this returns TRUE, the section was found. If it is a normal ELF 978 section, *RETVAL should be left unchanged. If it is not a normal 979 ELF section *RETVAL should be set to the SHN_xxxx index. */ 980 bfd_boolean (*elf_backend_section_from_bfd_section) 981 (bfd *, asection *, int *retval); 982 983 /* If this field is not NULL, it is called by the add_symbols phase 984 of a link just before adding a symbol to the global linker hash 985 table. It may modify any of the fields as it wishes. If *NAME 986 is set to NULL, the symbol will be skipped rather than being 987 added to the hash table. This function is responsible for 988 handling all processor dependent symbol bindings and section 989 indices, and must set at least *FLAGS and *SEC for each processor 990 dependent case; failure to do so will cause a link error. */ 991 bfd_boolean (*elf_add_symbol_hook) 992 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *, 993 const char **name, flagword *flags, asection **sec, bfd_vma *value); 994 995 /* If this field is not NULL, it is called by the elf_link_output_sym 996 phase of a link for each symbol which will appear in the object file. 997 On error, this function returns 0. 1 is returned when the symbol 998 should be output, 2 is returned when the symbol should be discarded. */ 999 int (*elf_backend_link_output_symbol_hook) 1000 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *, 1001 asection *, struct elf_link_hash_entry *); 1002 1003 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend 1004 linker the first time it encounters a dynamic object in the link. 1005 This function must create any sections required for dynamic 1006 linking. The ABFD argument is a dynamic object. The .interp, 1007 .dynamic, .dynsym, .dynstr, and .hash functions have already been 1008 created, and this function may modify the section flags if 1009 desired. This function will normally create the .got and .plt 1010 sections, but different backends have different requirements. */ 1011 bfd_boolean (*elf_backend_create_dynamic_sections) 1012 (bfd *abfd, struct bfd_link_info *info); 1013 1014 /* When creating a shared library, determine whether to omit the 1015 dynamic symbol for the section. */ 1016 bfd_boolean (*elf_backend_omit_section_dynsym) 1017 (bfd *output_bfd, struct bfd_link_info *info, asection *osec); 1018 1019 /* Return TRUE if relocations of targets are compatible to the extent 1020 that CHECK_RELOCS will properly process them. PR 4424. */ 1021 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *); 1022 1023 /* The CHECK_RELOCS function is called by the add_symbols phase of 1024 the ELF backend linker. It is called once for each section with 1025 relocs of an object file, just after the symbols for the object 1026 file have been added to the global linker hash table. The 1027 function must look through the relocs and do any special handling 1028 required. This generally means allocating space in the global 1029 offset table, and perhaps allocating space for a reloc. The 1030 relocs are always passed as Rela structures; if the section 1031 actually uses Rel structures, the r_addend field will always be 1032 zero. */ 1033 bfd_boolean (*check_relocs) 1034 (bfd *abfd, struct bfd_link_info *info, asection *o, 1035 const Elf_Internal_Rela *relocs); 1036 1037 /* The CHECK_DIRECTIVES function is called once per input file by 1038 the add_symbols phase of the ELF backend linker. The function 1039 must inspect the bfd and create any additional symbols according 1040 to any custom directives in the bfd. */ 1041 bfd_boolean (*check_directives) 1042 (bfd *abfd, struct bfd_link_info *info); 1043 1044 /* The NOTICE_AS_NEEDED function is called as the linker is about to 1045 handle an as-needed lib (ACT = notice_as_needed), and after the 1046 linker has decided to keep the lib (ACT = notice_needed) or when 1047 the lib is not needed (ACT = notice_not_needed). */ 1048 bfd_boolean (*notice_as_needed) 1049 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act); 1050 1051 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend 1052 linker for every symbol which is defined by a dynamic object and 1053 referenced by a regular object. This is called after all the 1054 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS 1055 function has been called. The hash table entry should be 1056 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be 1057 defined in a section from a dynamic object. Dynamic object 1058 sections are not included in the final link, and this function is 1059 responsible for changing the value to something which the rest of 1060 the link can deal with. This will normally involve adding an 1061 entry to the .plt or .got or some such section, and setting the 1062 symbol to point to that. */ 1063 bfd_boolean (*elf_backend_adjust_dynamic_symbol) 1064 (struct bfd_link_info *info, struct elf_link_hash_entry *h); 1065 1066 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker 1067 after all the linker input files have been seen but before the 1068 section sizes have been set. This is called after 1069 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */ 1070 bfd_boolean (*elf_backend_always_size_sections) 1071 (bfd *output_bfd, struct bfd_link_info *info); 1072 1073 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend 1074 linker after all the linker input files have been seen but before 1075 the sections sizes have been set. This is called after 1076 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols. 1077 It is only called when linking against a dynamic object. It must 1078 set the sizes of the dynamic sections, and may fill in their 1079 contents as well. The generic ELF linker can handle the .dynsym, 1080 .dynstr and .hash sections. This function must handle the 1081 .interp section and any sections created by the 1082 CREATE_DYNAMIC_SECTIONS entry point. */ 1083 bfd_boolean (*elf_backend_size_dynamic_sections) 1084 (bfd *output_bfd, struct bfd_link_info *info); 1085 1086 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections 1087 we keep to use as a base for relocs and symbols. */ 1088 void (*elf_backend_init_index_section) 1089 (bfd *output_bfd, struct bfd_link_info *info); 1090 1091 /* The RELOCATE_SECTION function is called by the ELF backend linker 1092 to handle the relocations for a section. 1093 1094 The relocs are always passed as Rela structures; if the section 1095 actually uses Rel structures, the r_addend field will always be 1096 zero. 1097 1098 This function is responsible for adjust the section contents as 1099 necessary, and (if using Rela relocs and generating a 1100 relocatable output file) adjusting the reloc addend as 1101 necessary. 1102 1103 This function does not have to worry about setting the reloc 1104 address or the reloc symbol index. 1105 1106 LOCAL_SYMS is a pointer to the swapped in local symbols. 1107 1108 LOCAL_SECTIONS is an array giving the section in the input file 1109 corresponding to the st_shndx field of each local symbol. 1110 1111 The global hash table entry for the global symbols can be found 1112 via elf_sym_hashes (input_bfd). 1113 1114 When generating relocatable output, this function must handle 1115 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 1116 going to be the section symbol corresponding to the output 1117 section, which means that the addend must be adjusted 1118 accordingly. 1119 1120 Returns FALSE on error, TRUE on success, 2 if successful and 1121 relocations should be written for this section. */ 1122 int (*elf_backend_relocate_section) 1123 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, 1124 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, 1125 Elf_Internal_Sym *local_syms, asection **local_sections); 1126 1127 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend 1128 linker just before it writes a symbol out to the .dynsym section. 1129 The processor backend may make any required adjustment to the 1130 symbol. It may also take the opportunity to set contents of the 1131 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on 1132 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called 1133 on those symbols which are defined by a dynamic object. */ 1134 bfd_boolean (*elf_backend_finish_dynamic_symbol) 1135 (bfd *output_bfd, struct bfd_link_info *info, 1136 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym); 1137 1138 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend 1139 linker just before it writes all the dynamic sections out to the 1140 output file. The FINISH_DYNAMIC_SYMBOL will have been called on 1141 all dynamic symbols. */ 1142 bfd_boolean (*elf_backend_finish_dynamic_sections) 1143 (bfd *output_bfd, struct bfd_link_info *info); 1144 1145 /* A function to do any beginning processing needed for the ELF file 1146 before building the ELF headers and computing file positions. */ 1147 void (*elf_backend_begin_write_processing) 1148 (bfd *, struct bfd_link_info *); 1149 1150 /* A function to do any final processing needed for the ELF file 1151 before writing it out. */ 1152 bfd_boolean (*elf_backend_final_write_processing) 1153 (bfd *); 1154 1155 /* This function is called by get_program_header_size. It should 1156 return the number of additional program segments which this BFD 1157 will need. It should return -1 on error. */ 1158 int (*elf_backend_additional_program_headers) 1159 (bfd *, struct bfd_link_info *); 1160 1161 /* This function is called to modify an existing segment map in a 1162 backend specific fashion. */ 1163 bfd_boolean (*elf_backend_modify_segment_map) 1164 (bfd *, struct bfd_link_info *); 1165 1166 /* This function is called to modify program headers just before 1167 they are written. */ 1168 bfd_boolean (*elf_backend_modify_headers) 1169 (bfd *, struct bfd_link_info *); 1170 1171 /* This function is called to see if the PHDR header should be 1172 checked for validity. */ 1173 bfd_boolean (*elf_backend_allow_non_load_phdr) 1174 (bfd *, const Elf_Internal_Phdr *, unsigned); 1175 1176 /* This function is called before section garbage collection to 1177 mark entry symbol sections. */ 1178 void (*gc_keep) 1179 (struct bfd_link_info *); 1180 1181 /* This function is called during section garbage collection to 1182 mark sections that define global symbols. */ 1183 bfd_boolean (*gc_mark_dynamic_ref) 1184 (struct elf_link_hash_entry *, void *); 1185 1186 /* This function is called during section gc to discover the section a 1187 particular relocation refers to. */ 1188 elf_gc_mark_hook_fn gc_mark_hook; 1189 1190 /* This function, if defined, is called after the first gc marking pass 1191 to allow the backend to mark additional sections. */ 1192 bfd_boolean (*gc_mark_extra_sections) 1193 (struct bfd_link_info *, elf_gc_mark_hook_fn); 1194 1195 /* This function is called to initialise ELF file header info. 1196 Customised versions can modify things like the OS and ABI version. */ 1197 bfd_boolean (*elf_backend_init_file_header) 1198 (bfd *, struct bfd_link_info *); 1199 1200 /* This function, if defined, prints a symbol to file and returns the 1201 name of the symbol to be printed. It should return NULL to fall 1202 back to default symbol printing. */ 1203 const char *(*elf_backend_print_symbol_all) 1204 (bfd *, void *, asymbol *); 1205 1206 /* This function, if defined, is called after all local symbols and 1207 global symbols converted to locals are emitted into the symtab 1208 section. It allows the backend to emit special local symbols 1209 not handled in the hash table. */ 1210 bfd_boolean (*elf_backend_output_arch_local_syms) 1211 (bfd *, struct bfd_link_info *, void *, 1212 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1213 struct elf_link_hash_entry *)); 1214 1215 /* This function, if defined, is called after all symbols are emitted 1216 into the symtab section. It allows the backend to emit special 1217 global symbols not handled in the hash table. */ 1218 bfd_boolean (*elf_backend_output_arch_syms) 1219 (bfd *, struct bfd_link_info *, void *, 1220 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *, 1221 struct elf_link_hash_entry *)); 1222 1223 /* Filter what symbols of the output file to include in the import 1224 library if one is created. */ 1225 unsigned int (*elf_backend_filter_implib_symbols) 1226 (bfd *, struct bfd_link_info *, asymbol **, long); 1227 1228 /* Copy any information related to dynamic linking from a pre-existing 1229 symbol to a newly created symbol. Also called to copy flags and 1230 other back-end info to a weakdef, in which case the symbol is not 1231 newly created and plt/got refcounts and dynamic indices should not 1232 be copied. */ 1233 void (*elf_backend_copy_indirect_symbol) 1234 (struct bfd_link_info *, struct elf_link_hash_entry *, 1235 struct elf_link_hash_entry *); 1236 1237 /* Modify any information related to dynamic linking such that the 1238 symbol is not exported. */ 1239 void (*elf_backend_hide_symbol) 1240 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 1241 1242 /* A function to do additional symbol fixup, called by 1243 _bfd_elf_fix_symbol_flags. */ 1244 bfd_boolean (*elf_backend_fixup_symbol) 1245 (struct bfd_link_info *, struct elf_link_hash_entry *); 1246 1247 /* Merge the backend specific symbol attribute. */ 1248 void (*elf_backend_merge_symbol_attribute) 1249 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean, 1250 bfd_boolean); 1251 1252 /* This function, if defined, will return a string containing the 1253 name of a target-specific dynamic tag. */ 1254 char *(*elf_backend_get_target_dtag) 1255 (bfd_vma); 1256 1257 /* Decide whether an undefined symbol is special and can be ignored. 1258 This is the case for OPTIONAL symbols on IRIX. */ 1259 bfd_boolean (*elf_backend_ignore_undef_symbol) 1260 (struct elf_link_hash_entry *); 1261 1262 /* Emit relocations. Overrides default routine for emitting relocs, 1263 except during a relocatable link, or if all relocs are being emitted. */ 1264 bfd_boolean (*elf_backend_emit_relocs) 1265 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 1266 struct elf_link_hash_entry **); 1267 1268 /* Update relocations. It is allowed to change the number and the order. 1269 In such a case hashes should be invalidated. */ 1270 void (*elf_backend_update_relocs) 1271 (asection *, struct bfd_elf_section_reloc_data *); 1272 1273 /* Count relocations. Not called for relocatable links 1274 or if all relocs are being preserved in the output. */ 1275 unsigned int (*elf_backend_count_relocs) 1276 (struct bfd_link_info *, asection *); 1277 1278 /* Count additionals relocations. Called for relocatable links if 1279 additional relocations needs to be created. */ 1280 unsigned int (*elf_backend_count_additional_relocs) 1281 (asection *); 1282 1283 /* Say whether to sort relocs output by ld -r and ld --emit-relocs, 1284 by r_offset. If NULL, default to true. */ 1285 bfd_boolean (*sort_relocs_p) 1286 (asection *); 1287 1288 /* This function, if defined, is called when an NT_PRSTATUS note is found 1289 in a core file. */ 1290 bfd_boolean (*elf_backend_grok_prstatus) 1291 (bfd *, Elf_Internal_Note *); 1292 1293 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO 1294 note is found in a core file. */ 1295 bfd_boolean (*elf_backend_grok_psinfo) 1296 (bfd *, Elf_Internal_Note *); 1297 1298 /* This function, if defined, is called when a "FreeBSD" NT_PRSTATUS 1299 note is found in a core file. */ 1300 bfd_boolean (*elf_backend_grok_freebsd_prstatus) 1301 (bfd *, Elf_Internal_Note *); 1302 1303 /* This function, if defined, is called to write a note to a corefile. */ 1304 char *(*elf_backend_write_core_note) 1305 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...); 1306 1307 /* This function, if defined, is called to convert target-specific 1308 section flag names into hex values. */ 1309 flagword (*elf_backend_lookup_section_flags_hook) 1310 (char *); 1311 1312 /* This function returns class of a reloc type. */ 1313 enum elf_reloc_type_class (*elf_backend_reloc_type_class) 1314 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *); 1315 1316 /* This function, if defined, removes information about discarded functions 1317 from other sections which mention them. */ 1318 bfd_boolean (*elf_backend_discard_info) 1319 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *); 1320 1321 /* This function, if defined, signals that the function above has removed 1322 the discarded relocations for this section. */ 1323 bfd_boolean (*elf_backend_ignore_discarded_relocs) 1324 (asection *); 1325 1326 /* What to do when ld finds relocations against symbols defined in 1327 discarded sections. */ 1328 unsigned int (*action_discarded) 1329 (asection *); 1330 1331 /* This function returns the width of FDE pointers in bytes, or 0 if 1332 that can't be determined for some reason. The default definition 1333 goes by the bfd's EI_CLASS. */ 1334 unsigned int (*elf_backend_eh_frame_address_size) 1335 (bfd *, const asection *); 1336 1337 /* These functions tell elf-eh-frame whether to attempt to turn 1338 absolute or lsda encodings into pc-relative ones. The default 1339 definition enables these transformations. */ 1340 bfd_boolean (*elf_backend_can_make_relative_eh_frame) 1341 (bfd *, struct bfd_link_info *, asection *); 1342 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame) 1343 (bfd *, struct bfd_link_info *, asection *); 1344 1345 /* This function returns an encoding after computing the encoded 1346 value (and storing it in ENCODED) for the given OFFSET into OSEC, 1347 to be stored in at LOC_OFFSET into the LOC_SEC input section. 1348 The default definition chooses a 32-bit PC-relative encoding. */ 1349 bfd_byte (*elf_backend_encode_eh_address) 1350 (bfd *abfd, struct bfd_link_info *info, 1351 asection *osec, bfd_vma offset, 1352 asection *loc_sec, bfd_vma loc_offset, 1353 bfd_vma *encoded); 1354 1355 /* This function, if defined, may write out the given section. 1356 Returns TRUE if it did so and FALSE if the caller should. */ 1357 bfd_boolean (*elf_backend_write_section) 1358 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 1359 1360 /* The level of IRIX compatibility we're striving for. 1361 MIPS ELF specific function. */ 1362 irix_compat_t (*elf_backend_mips_irix_compat) 1363 (bfd *); 1364 1365 reloc_howto_type *(*elf_backend_mips_rtype_to_howto) 1366 (bfd *, unsigned int, bfd_boolean); 1367 1368 /* The swapping table to use when dealing with ECOFF information. 1369 Used for the MIPS ELF .mdebug section. */ 1370 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap; 1371 1372 /* This function implements `bfd_elf_bfd_from_remote_memory'; 1373 see elf.c, elfcode.h. */ 1374 bfd *(*elf_backend_bfd_from_remote_memory) 1375 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 1376 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, 1377 bfd_size_type len)); 1378 1379 bfd_boolean (*elf_backend_core_find_build_id) (bfd *, bfd_vma); 1380 1381 /* This function is used by `_bfd_elf_get_synthetic_symtab'; 1382 see elf.c. */ 1383 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *); 1384 1385 /* Is symbol defined in common section? */ 1386 bfd_boolean (*common_definition) (Elf_Internal_Sym *); 1387 1388 /* Return a common section index for section. */ 1389 unsigned int (*common_section_index) (asection *); 1390 1391 /* Return a common section for section. */ 1392 asection *(*common_section) (asection *); 1393 1394 /* Return TRUE if we can merge 2 definitions. */ 1395 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *, 1396 const Elf_Internal_Sym *, asection **, 1397 bfd_boolean, bfd_boolean, 1398 bfd *, const asection *); 1399 1400 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 1401 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *); 1402 1403 /* If non-NULL, called to register the location of XLAT_LOC within 1404 .MIPS.xhash at which real final dynindx for H will be written. 1405 If XLAT_LOC is zero, the symbol is not included in 1406 .MIPS.xhash and no dynindx will be written. */ 1407 void (*record_xhash_symbol) 1408 (struct elf_link_hash_entry *h, bfd_vma xlat_loc); 1409 1410 /* Return TRUE if type is a function symbol type. */ 1411 bfd_boolean (*is_function_type) (unsigned int type); 1412 1413 /* If the ELF symbol SYM might be a function in SEC, return the 1414 function size and set *CODE_OFF to the function's entry point, 1415 otherwise return zero. */ 1416 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec, 1417 bfd_vma *code_off); 1418 1419 /* Given NAME, the name of a relocation section stripped of its 1420 .rel/.rela prefix, return the section in ABFD to which the 1421 relocations apply. */ 1422 asection *(*get_reloc_section) (bfd *abfd, const char *name); 1423 1424 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which 1425 has a type >= SHT_LOOS. Returns TRUE if the fields were initialised, 1426 FALSE otherwise. Can be called multiple times for a given section, 1427 until it returns TRUE. Most of the times it is called ISECTION will be 1428 set to an input section that might be associated with the output section. 1429 The last time that it is called, ISECTION will be set to NULL. */ 1430 bfd_boolean (*elf_backend_copy_special_section_fields) 1431 (const bfd *ibfd, bfd *obfd, const Elf_Internal_Shdr *isection, 1432 Elf_Internal_Shdr *osection); 1433 1434 /* Used to handle bad SHF_LINK_ORDER input. */ 1435 void (*link_order_error_handler) (const char *, ...); 1436 1437 /* Name of the PLT relocation section. */ 1438 const char *relplt_name; 1439 1440 /* Alternate EM_xxxx machine codes for this backend. */ 1441 int elf_machine_alt1; 1442 int elf_machine_alt2; 1443 1444 const struct elf_size_info *s; 1445 1446 /* An array of target specific special sections. */ 1447 const struct bfd_elf_special_section *special_sections; 1448 1449 /* The size in bytes of the header for the GOT. This includes the 1450 so-called reserved entries on some systems. */ 1451 bfd_vma got_header_size; 1452 1453 /* The size of the GOT entry for the symbol pointed to by H if non-NULL, 1454 otherwise by the local symbol with index SYMNDX in IBFD. */ 1455 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *, 1456 struct elf_link_hash_entry *h, 1457 bfd *ibfd, unsigned long symndx); 1458 1459 /* The vendor name to use for a processor-standard attributes section. */ 1460 const char *obj_attrs_vendor; 1461 1462 /* The section name to use for a processor-standard attributes section. */ 1463 const char *obj_attrs_section; 1464 1465 /* Return 1, 2 or 3 to indicate what type of arguments a 1466 processor-specific tag takes. */ 1467 int (*obj_attrs_arg_type) (int); 1468 1469 /* The section type to use for an attributes section. */ 1470 unsigned int obj_attrs_section_type; 1471 1472 /* This function determines the order in which any attributes are 1473 written. It must be defined for input in the range 1474 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range 1475 is used in order to make unity easy). The returned value is the 1476 actual tag number to place in the input position. */ 1477 int (*obj_attrs_order) (int); 1478 1479 /* Handle merging unknown attributes; either warn and return TRUE, 1480 or give an error and return FALSE. */ 1481 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int); 1482 1483 /* Parse GNU properties. Return the property kind. If the property 1484 is corrupt, issue an error message and return property_corrupt. */ 1485 enum elf_property_kind (*parse_gnu_properties) (bfd *, unsigned int, 1486 bfd_byte *, 1487 unsigned int); 1488 1489 /* Merge GNU properties. Return TRUE if property is updated. */ 1490 bfd_boolean (*merge_gnu_properties) (struct bfd_link_info *, bfd *, bfd *, 1491 elf_property *, elf_property *); 1492 1493 /* Set up GNU properties. */ 1494 bfd *(*setup_gnu_properties) (struct bfd_link_info *); 1495 1496 /* Fix up GNU properties. */ 1497 void (*fixup_gnu_properties) (struct bfd_link_info *, 1498 elf_property_list **); 1499 1500 /* Encoding used for compact EH tables. */ 1501 int (*compact_eh_encoding) (struct bfd_link_info *); 1502 1503 /* Opcode representing no unwind. */ 1504 int (*cant_unwind_opcode) (struct bfd_link_info *); 1505 1506 /* This is non-zero if static TLS segments require a special alignment. */ 1507 unsigned static_tls_alignment; 1508 1509 /* Alignment for the PT_GNU_STACK segment. */ 1510 unsigned stack_align; 1511 1512 /* Flag bits to assign to a section of type SHT_STRTAB. */ 1513 unsigned long elf_strtab_flags; 1514 1515 /* This is TRUE if the linker should act like collect and gather 1516 global constructors and destructors by name. This is TRUE for 1517 MIPS ELF because the Irix 5 tools can not handle the .init 1518 section. */ 1519 unsigned collect : 1; 1520 1521 /* This is TRUE if the linker should ignore changes to the type of a 1522 symbol. This is TRUE for MIPS ELF because some Irix 5 objects 1523 record undefined functions as STT_OBJECT although the definitions 1524 are STT_FUNC. */ 1525 unsigned type_change_ok : 1; 1526 1527 /* Whether the backend may use REL relocations. (Some backends use 1528 both REL and RELA relocations, and this flag is set for those 1529 backends.) */ 1530 unsigned may_use_rel_p : 1; 1531 1532 /* Whether the backend may use RELA relocations. (Some backends use 1533 both REL and RELA relocations, and this flag is set for those 1534 backends.) */ 1535 unsigned may_use_rela_p : 1; 1536 1537 /* Whether the default relocation type is RELA. If a backend with 1538 this flag set wants REL relocations for a particular section, 1539 it must note that explicitly. Similarly, if this flag is clear, 1540 and the backend wants RELA relocations for a particular 1541 section. */ 1542 unsigned default_use_rela_p : 1; 1543 1544 /* True if PLT and copy relocations should be RELA by default. */ 1545 unsigned rela_plts_and_copies_p : 1; 1546 1547 /* Set if RELA relocations for a relocatable link can be handled by 1548 generic code. Backends that set this flag need do nothing in the 1549 backend relocate_section routine for relocatable linking. */ 1550 unsigned rela_normal : 1; 1551 1552 /* Set if DT_REL/DT_RELA/DT_RELSZ/DT_RELASZ should not include PLT 1553 relocations. */ 1554 unsigned dtrel_excludes_plt : 1; 1555 1556 /* TRUE if addresses "naturally" sign extend. This is used when 1557 swapping in from Elf32 when BFD64. */ 1558 unsigned sign_extend_vma : 1; 1559 1560 unsigned want_got_plt : 1; 1561 unsigned plt_readonly : 1; 1562 unsigned want_plt_sym : 1; 1563 unsigned plt_not_loaded : 1; 1564 unsigned plt_alignment : 4; 1565 unsigned can_gc_sections : 1; 1566 unsigned can_refcount : 1; 1567 unsigned want_got_sym : 1; 1568 unsigned want_dynbss : 1; 1569 unsigned want_dynrelro : 1; 1570 1571 /* Targets which do not support physical addressing often require 1572 that the p_paddr field in the section header to be set to zero. 1573 This field indicates whether this behavior is required. */ 1574 unsigned want_p_paddr_set_to_zero : 1; 1575 1576 /* Target has broken hardware and/or kernel that requires pages not 1577 to be mapped twice with different permissions. */ 1578 unsigned no_page_alias : 1; 1579 1580 /* True if an object file lacking a .note.GNU-stack section 1581 should be assumed to be requesting exec stack. At least one 1582 other file in the link needs to have a .note.GNU-stack section 1583 for a PT_GNU_STACK segment to be created. */ 1584 unsigned default_execstack : 1; 1585 1586 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize 1587 in length rather than sec->size in length, if sec->rawsize is 1588 non-zero and smaller than sec->size. */ 1589 unsigned caches_rawsize : 1; 1590 1591 /* Address of protected data defined in the shared library may be 1592 external, i.e., due to copy relocation. */ 1593 unsigned extern_protected_data : 1; 1594 1595 /* True if `_bfd_elf_link_renumber_dynsyms' must be called even for 1596 static binaries. */ 1597 unsigned always_renumber_dynsyms : 1; 1598 1599 /* True if the 32-bit Linux PRPSINFO structure's `pr_uid' and `pr_gid' 1600 members use a 16-bit data type. */ 1601 unsigned linux_prpsinfo32_ugid16 : 1; 1602 1603 /* True if the 64-bit Linux PRPSINFO structure's `pr_uid' and `pr_gid' 1604 members use a 16-bit data type. */ 1605 unsigned linux_prpsinfo64_ugid16 : 1; 1606 }; 1607 1608 /* Information about reloc sections associated with a bfd_elf_section_data 1609 structure. */ 1610 struct bfd_elf_section_reloc_data 1611 { 1612 /* The ELF header for the reloc section associated with this 1613 section, if any. */ 1614 Elf_Internal_Shdr *hdr; 1615 /* The number of relocations currently assigned to HDR. */ 1616 unsigned int count; 1617 /* The ELF section number of the reloc section. Only used for an 1618 output file. */ 1619 int idx; 1620 /* Used by the backend linker to store the symbol hash table entries 1621 associated with relocs against global symbols. */ 1622 struct elf_link_hash_entry **hashes; 1623 }; 1624 1625 /* Information stored for each BFD section in an ELF file. This 1626 structure is allocated by elf_new_section_hook. */ 1627 1628 struct bfd_elf_section_data 1629 { 1630 /* The ELF header for this section. */ 1631 Elf_Internal_Shdr this_hdr; 1632 1633 /* INPUT_SECTION_FLAGS if specified in the linker script. */ 1634 struct flag_info *section_flag_info; 1635 1636 /* Information about the REL and RELA reloc sections associated 1637 with this section, if any. */ 1638 struct bfd_elf_section_reloc_data rel, rela; 1639 1640 /* The ELF section number of this section. */ 1641 int this_idx; 1642 1643 /* Used by the backend linker when generating a shared library to 1644 record the dynamic symbol index for a section symbol 1645 corresponding to this section. A value of 0 means that there is 1646 no dynamic symbol for this section. */ 1647 int dynindx; 1648 1649 /* A pointer to the linked-to section for SHF_LINK_ORDER. */ 1650 asection *linked_to; 1651 1652 /* A pointer to the swapped relocs. If the section uses REL relocs, 1653 rather than RELA, all the r_addend fields will be zero. This 1654 pointer may be NULL. It is used by the backend linker. */ 1655 Elf_Internal_Rela *relocs; 1656 1657 /* A pointer to a linked list tracking dynamic relocs copied for 1658 local symbols. */ 1659 void *local_dynrel; 1660 1661 /* A pointer to the bfd section used for dynamic relocs. */ 1662 asection *sreloc; 1663 1664 union { 1665 /* Group name, if this section is a member of a group. */ 1666 const char *name; 1667 1668 /* Group signature sym, if this is the SHT_GROUP section. */ 1669 struct bfd_symbol *id; 1670 } group; 1671 1672 /* For a member of a group, points to the SHT_GROUP section. 1673 NULL for the SHT_GROUP section itself and non-group sections. */ 1674 asection *sec_group; 1675 1676 /* A linked list of member sections in the group. Circular when used by 1677 the linker. For the SHT_GROUP section, points at first member. */ 1678 asection *next_in_group; 1679 1680 /* The FDEs associated with this section. The u.fde.next_in_section 1681 field acts as a chain pointer. */ 1682 struct eh_cie_fde *fde_list; 1683 1684 /* Link from a text section to its .eh_frame_entry section. */ 1685 asection *eh_frame_entry; 1686 1687 /* A pointer used for various section optimizations. */ 1688 void *sec_info; 1689 }; 1690 1691 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd) 1692 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to) 1693 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type) 1694 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags) 1695 #define elf_section_info(sec) (elf_section_data(sec)->this_hdr.sh_info) 1696 #define elf_group_name(sec) (elf_section_data(sec)->group.name) 1697 #define elf_group_id(sec) (elf_section_data(sec)->group.id) 1698 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group) 1699 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list) 1700 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group) 1701 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry) 1702 1703 #define xvec_get_elf_backend_data(xvec) \ 1704 ((const struct elf_backend_data *) (xvec)->backend_data) 1705 1706 #define get_elf_backend_data(abfd) \ 1707 xvec_get_elf_backend_data ((abfd)->xvec) 1708 1709 /* The least object attributes (within an attributes subsection) known 1710 for any target. Some code assumes that the value 0 is not used and 1711 the field for that attribute can instead be used as a marker to 1712 indicate that attributes have been initialized. */ 1713 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2 1714 1715 /* The maximum number of known object attributes for any target. */ 1716 #define NUM_KNOWN_OBJ_ATTRIBUTES 71 1717 1718 /* The value of an object attribute. The type indicates whether the attribute 1719 holds and integer, a string, or both. It can also indicate that there can 1720 be no default (i.e. all values must be written to file, even zero), or 1721 that the value is in error and should not be written to file. */ 1722 1723 typedef struct obj_attribute 1724 { 1725 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0) 1726 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1) 1727 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2) 1728 #define ATTR_TYPE_FLAG_ERROR (1 << 3) 1729 1730 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL) 1731 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL) 1732 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT) 1733 #define ATTR_TYPE_HAS_ERROR(TYPE) ((TYPE) & ATTR_TYPE_FLAG_ERROR) 1734 1735 int type; 1736 unsigned int i; 1737 char *s; 1738 } obj_attribute; 1739 1740 typedef struct obj_attribute_list 1741 { 1742 struct obj_attribute_list *next; 1743 unsigned int tag; 1744 obj_attribute attr; 1745 } obj_attribute_list; 1746 1747 /* Object attributes may either be defined by the processor ABI, index 1748 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific 1749 (and possibly also processor-specific), index OBJ_ATTR_GNU. */ 1750 #define OBJ_ATTR_PROC 0 1751 #define OBJ_ATTR_GNU 1 1752 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC 1753 #define OBJ_ATTR_LAST OBJ_ATTR_GNU 1754 1755 /* The following object attribute tags are taken as generic, for all 1756 targets and for "gnu" where there is no target standard. */ 1757 enum 1758 { 1759 Tag_NULL = 0, 1760 Tag_File = 1, 1761 Tag_Section = 2, 1762 Tag_Symbol = 3, 1763 Tag_compatibility = 32 1764 }; 1765 1766 /* The following struct stores information about every SystemTap section 1767 found in the object file. */ 1768 struct sdt_note 1769 { 1770 struct sdt_note *next; 1771 bfd_size_type size; 1772 bfd_byte data[1]; 1773 }; 1774 1775 /* tdata information grabbed from an elf core file. */ 1776 struct core_elf_obj_tdata 1777 { 1778 int signal; 1779 int pid; 1780 int lwpid; 1781 char* program; 1782 char* command; 1783 }; 1784 1785 /* Extra tdata information held for output ELF BFDs. */ 1786 struct output_elf_obj_tdata 1787 { 1788 struct elf_segment_map *seg_map; 1789 struct elf_strtab_hash *strtab_ptr; 1790 1791 /* STT_SECTION symbols for each section */ 1792 asymbol **section_syms; 1793 1794 /* Used to determine if PT_GNU_EH_FRAME segment header should be 1795 created. */ 1796 asection *eh_frame_hdr; 1797 1798 /* NT_GNU_BUILD_ID note type info. */ 1799 struct 1800 { 1801 bfd_boolean (*after_write_object_contents) (bfd *); 1802 const char *style; 1803 asection *sec; 1804 } build_id; 1805 1806 /* Records the result of `get_program_header_size'. */ 1807 bfd_size_type program_header_size; 1808 1809 /* Used when laying out sections. */ 1810 file_ptr next_file_pos; 1811 1812 int num_section_syms; 1813 unsigned int shstrtab_section, strtab_section; 1814 1815 /* Segment flags for the PT_GNU_STACK segment. */ 1816 unsigned int stack_flags; 1817 1818 /* Used to determine if the e_flags field has been initialized */ 1819 bfd_boolean flags_init; 1820 }; 1821 1822 /* Indicate if the bfd contains SHF_GNU_MBIND sections or symbols that 1823 have the STT_GNU_IFUNC symbol type or STB_GNU_UNIQUE binding. Used 1824 to set the osabi field in the ELF header structure. */ 1825 enum elf_gnu_osabi 1826 { 1827 elf_gnu_osabi_mbind = 1 << 0, 1828 elf_gnu_osabi_ifunc = 1 << 1, 1829 elf_gnu_osabi_unique = 1 << 2, 1830 }; 1831 1832 typedef struct elf_section_list 1833 { 1834 Elf_Internal_Shdr hdr; 1835 unsigned int ndx; 1836 struct elf_section_list * next; 1837 } elf_section_list; 1838 1839 enum dynamic_lib_link_class { 1840 DYN_NORMAL = 0, 1841 DYN_AS_NEEDED = 1, 1842 DYN_DT_NEEDED = 2, 1843 DYN_NO_ADD_NEEDED = 4, 1844 DYN_NO_NEEDED = 8 1845 }; 1846 1847 /* Some private data is stashed away for future use using the tdata pointer 1848 in the bfd structure. */ 1849 1850 struct elf_obj_tdata 1851 { 1852 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ 1853 Elf_Internal_Shdr **elf_sect_ptr; 1854 Elf_Internal_Phdr *phdr; 1855 Elf_Internal_Shdr symtab_hdr; 1856 Elf_Internal_Shdr shstrtab_hdr; 1857 Elf_Internal_Shdr strtab_hdr; 1858 Elf_Internal_Shdr dynsymtab_hdr; 1859 Elf_Internal_Shdr dynstrtab_hdr; 1860 Elf_Internal_Shdr dynversym_hdr; 1861 Elf_Internal_Shdr dynverref_hdr; 1862 Elf_Internal_Shdr dynverdef_hdr; 1863 elf_section_list * symtab_shndx_list; 1864 bfd_vma gp; /* The gp value */ 1865 unsigned int gp_size; /* The gp size */ 1866 unsigned int num_elf_sections; /* elf_sect_ptr size */ 1867 1868 /* A mapping from external symbols to entries in the linker hash 1869 table, used when linking. This is indexed by the symbol index 1870 minus the sh_info field of the symbol table header. */ 1871 struct elf_link_hash_entry **sym_hashes; 1872 1873 /* Track usage and final offsets of GOT entries for local symbols. 1874 This array is indexed by symbol index. Elements are used 1875 identically to "got" in struct elf_link_hash_entry. */ 1876 union 1877 { 1878 bfd_signed_vma *refcounts; 1879 bfd_vma *offsets; 1880 struct got_entry **ents; 1881 } local_got; 1882 1883 /* The linker ELF emulation code needs to let the backend ELF linker 1884 know what filename should be used for a dynamic object if the 1885 dynamic object is found using a search. The emulation code then 1886 sometimes needs to know what name was actually used. Until the 1887 file has been added to the linker symbol table, this field holds 1888 the name the linker wants. After it has been added, it holds the 1889 name actually used, which will be the DT_SONAME entry if there is 1890 one. */ 1891 const char *dt_name; 1892 1893 /* The linker emulation needs to know what audit libs 1894 are used by a dynamic object. */ 1895 const char *dt_audit; 1896 1897 /* Used by find_nearest_line entry point. */ 1898 void *line_info; 1899 1900 /* A place to stash dwarf1 info for this bfd. */ 1901 struct dwarf1_debug *dwarf1_find_line_info; 1902 1903 /* A place to stash dwarf2 info for this bfd. */ 1904 void *dwarf2_find_line_info; 1905 1906 /* Stash away info for yet another find line/function variant. */ 1907 void *elf_find_function_cache; 1908 1909 /* Number of symbol version definitions we are about to emit. */ 1910 unsigned int cverdefs; 1911 1912 /* Number of symbol version references we are about to emit. */ 1913 unsigned int cverrefs; 1914 1915 /* Symbol version definitions in external objects. */ 1916 Elf_Internal_Verdef *verdef; 1917 1918 /* Symbol version references to external objects. */ 1919 Elf_Internal_Verneed *verref; 1920 1921 /* A pointer to the .eh_frame section. */ 1922 asection *eh_frame_section; 1923 1924 /* Symbol buffer. */ 1925 void *symbuf; 1926 1927 /* List of GNU properties. Will be updated by setup_gnu_properties 1928 after all input GNU properties are merged for output. */ 1929 elf_property_list *properties; 1930 1931 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES]; 1932 obj_attribute_list *other_obj_attributes[2]; 1933 1934 /* Linked-list containing information about every Systemtap section 1935 found in the object file. Each section corresponds to one entry 1936 in the list. */ 1937 struct sdt_note *sdt_note_head; 1938 1939 Elf_Internal_Shdr **group_sect_ptr; 1940 int num_group; 1941 1942 /* Index into group_sect_ptr, updated by setup_group when finding a 1943 section's group. Used to optimize subsequent group searches. */ 1944 unsigned int group_search_offset; 1945 1946 unsigned int symtab_section, dynsymtab_section; 1947 unsigned int dynversym_section, dynverdef_section, dynverref_section; 1948 1949 /* An identifier used to distinguish different target 1950 specific extensions to this structure. */ 1951 ENUM_BITFIELD (elf_target_id) object_id : 6; 1952 1953 /* Whether a dyanmic object was specified normally on the linker 1954 command line, or was specified when --as-needed was in effect, 1955 or was found via a DT_NEEDED entry. */ 1956 ENUM_BITFIELD (dynamic_lib_link_class) dyn_lib_class : 4; 1957 1958 /* Whether the bfd uses OS specific bits that require ELFOSABI_GNU. */ 1959 ENUM_BITFIELD (elf_gnu_osabi) has_gnu_osabi : 3; 1960 1961 /* Whether if the bfd contains the GNU_PROPERTY_NO_COPY_ON_PROTECTED 1962 property. */ 1963 unsigned int has_no_copy_on_protected : 1; 1964 1965 /* Irix 5 often screws up the symbol table, sorting local symbols 1966 after global symbols. This flag is set if the symbol table in 1967 this BFD appears to be screwed up. If it is, we ignore the 1968 sh_info field in the symbol table header, and always read all the 1969 symbols. */ 1970 unsigned int bad_symtab : 1; 1971 1972 /* Information grabbed from an elf core file. */ 1973 struct core_elf_obj_tdata *core; 1974 1975 /* More information held for output ELF BFDs. */ 1976 struct output_elf_obj_tdata *o; 1977 }; 1978 1979 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) 1980 1981 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id) 1982 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size) 1983 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) 1984 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) 1985 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections) 1986 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map) 1987 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos) 1988 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr) 1989 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags) 1990 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr) 1991 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) 1992 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list) 1993 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section) 1994 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section) 1995 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr) 1996 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section) 1997 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section) 1998 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section) 1999 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section) 2000 #define elf_eh_frame_section(bfd) \ 2001 (elf_tdata(bfd) -> eh_frame_section) 2002 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms) 2003 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms) 2004 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) 2005 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) 2006 #define elf_gp(bfd) (elf_tdata(bfd) -> gp) 2007 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size) 2008 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes) 2009 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts) 2010 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets) 2011 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents) 2012 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name) 2013 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit) 2014 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class) 2015 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab) 2016 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init) 2017 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes) 2018 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes) 2019 #define elf_known_obj_attributes_proc(bfd) \ 2020 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC]) 2021 #define elf_other_obj_attributes_proc(bfd) \ 2022 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC]) 2023 #define elf_properties(bfd) (elf_tdata (bfd) -> properties) 2024 #define elf_has_no_copy_on_protected(bfd) \ 2025 (elf_tdata(bfd) -> has_no_copy_on_protected) 2026 2027 extern void _bfd_elf_swap_verdef_in 2028 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *); 2029 extern void _bfd_elf_swap_verdef_out 2030 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *); 2031 extern void _bfd_elf_swap_verdaux_in 2032 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *); 2033 extern void _bfd_elf_swap_verdaux_out 2034 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *); 2035 extern void _bfd_elf_swap_verneed_in 2036 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *); 2037 extern void _bfd_elf_swap_verneed_out 2038 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *); 2039 extern void _bfd_elf_swap_vernaux_in 2040 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *); 2041 extern void _bfd_elf_swap_vernaux_out 2042 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *); 2043 extern void _bfd_elf_swap_versym_in 2044 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *); 2045 extern void _bfd_elf_swap_versym_out 2046 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *); 2047 2048 extern unsigned int _bfd_elf_section_from_bfd_section 2049 (bfd *, asection *); 2050 extern char *bfd_elf_string_from_elf_section 2051 (bfd *, unsigned, unsigned); 2052 extern Elf_Internal_Sym *bfd_elf_get_elf_syms 2053 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *, 2054 Elf_External_Sym_Shndx *); 2055 extern char * bfd_elf_get_str_section (bfd *, unsigned int); 2056 extern const char *bfd_elf_sym_name 2057 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *); 2058 2059 extern bfd_boolean _bfd_elf_copy_private_bfd_data 2060 (bfd *, bfd *); 2061 extern bfd_boolean _bfd_elf_print_private_bfd_data 2062 (bfd *, void *); 2063 const char * _bfd_elf_get_symbol_version_string 2064 (bfd *, asymbol *, bfd_boolean *); 2065 extern void bfd_elf_print_symbol 2066 (bfd *, void *, asymbol *, bfd_print_symbol_type); 2067 2068 extern unsigned int _bfd_elf_eh_frame_address_size 2069 (bfd *, const asection *); 2070 extern bfd_byte _bfd_elf_encode_eh_address 2071 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset, 2072 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded); 2073 extern bfd_boolean _bfd_elf_can_make_relative 2074 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section); 2075 2076 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class 2077 (const struct bfd_link_info *, const asection *, 2078 const Elf_Internal_Rela *); 2079 extern bfd_vma _bfd_elf_rela_local_sym 2080 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *); 2081 extern bfd_vma _bfd_elf_rel_local_sym 2082 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma); 2083 extern bfd_vma _bfd_elf_section_offset 2084 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 2085 2086 extern unsigned long bfd_elf_hash 2087 (const char *); 2088 extern unsigned long bfd_elf_gnu_hash 2089 (const char *); 2090 2091 extern bfd_reloc_status_type bfd_elf_generic_reloc 2092 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 2093 extern bfd_boolean bfd_elf_allocate_object 2094 (bfd *, size_t, enum elf_target_id); 2095 extern bfd_boolean bfd_elf_make_object 2096 (bfd *); 2097 extern bfd_boolean bfd_elf_mkcorefile 2098 (bfd *); 2099 extern bfd_boolean _bfd_elf_make_section_from_shdr 2100 (bfd *, Elf_Internal_Shdr *, const char *, int); 2101 extern bfd_boolean _bfd_elf_make_section_from_phdr 2102 (bfd *, Elf_Internal_Phdr *, int, const char *); 2103 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc 2104 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 2105 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create 2106 (bfd *); 2107 extern void _bfd_elf_link_hash_table_free 2108 (bfd *); 2109 extern void _bfd_elf_link_hash_copy_indirect 2110 (struct bfd_link_info *, struct elf_link_hash_entry *, 2111 struct elf_link_hash_entry *); 2112 extern void _bfd_elf_link_hash_hide_symbol 2113 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean); 2114 extern void _bfd_elf_link_hide_symbol 2115 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *); 2116 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol 2117 (struct bfd_link_info *, struct elf_link_hash_entry *); 2118 extern bfd_boolean _bfd_elf_link_hash_table_init 2119 (struct elf_link_hash_table *, bfd *, 2120 struct bfd_hash_entry *(*) 2121 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *), 2122 unsigned int, enum elf_target_id); 2123 extern bfd_boolean _bfd_elf_slurp_version_tables 2124 (bfd *, bfd_boolean); 2125 extern bfd_boolean _bfd_elf_merge_sections 2126 (bfd *, struct bfd_link_info *); 2127 extern bfd_boolean _bfd_elf_match_sections_by_type 2128 (bfd *, const asection *, bfd *, const asection *); 2129 extern bfd_boolean bfd_elf_is_group_section 2130 (bfd *, const struct bfd_section *); 2131 extern const char *bfd_elf_group_name 2132 (bfd *, const struct bfd_section *); 2133 extern bfd_boolean _bfd_elf_section_already_linked 2134 (bfd *, asection *, struct bfd_link_info *); 2135 extern void bfd_elf_set_group_contents 2136 (bfd *, asection *, void *); 2137 extern unsigned int _bfd_elf_filter_global_symbols 2138 (bfd *, struct bfd_link_info *, asymbol **, long); 2139 extern asection *_bfd_elf_check_kept_section 2140 (asection *, struct bfd_link_info *); 2141 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms 2142 extern void _bfd_elf_copy_link_hash_symbol_type 2143 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *); 2144 extern bfd_boolean _bfd_elf_size_group_sections 2145 (struct bfd_link_info *); 2146 extern bfd_boolean _bfd_elf_fixup_group_sections 2147 (bfd *, asection *); 2148 extern bfd_boolean _bfd_elf_copy_private_header_data 2149 (bfd *, bfd *); 2150 extern bfd_boolean _bfd_elf_copy_private_symbol_data 2151 (bfd *, asymbol *, bfd *, asymbol *); 2152 #define _bfd_generic_init_private_section_data \ 2153 _bfd_elf_init_private_section_data 2154 extern bfd_boolean _bfd_elf_init_private_section_data 2155 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *); 2156 extern bfd_boolean _bfd_elf_copy_private_section_data 2157 (bfd *, asection *, bfd *, asection *); 2158 extern bfd_boolean _bfd_elf_write_object_contents 2159 (bfd *); 2160 extern bfd_boolean _bfd_elf_write_corefile_contents 2161 (bfd *); 2162 extern bfd_boolean _bfd_elf_set_section_contents 2163 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 2164 extern long _bfd_elf_get_symtab_upper_bound 2165 (bfd *); 2166 extern long _bfd_elf_canonicalize_symtab 2167 (bfd *, asymbol **); 2168 extern long _bfd_elf_get_dynamic_symtab_upper_bound 2169 (bfd *); 2170 extern long _bfd_elf_canonicalize_dynamic_symtab 2171 (bfd *, asymbol **); 2172 extern long _bfd_elf_get_synthetic_symtab 2173 (bfd *, long, asymbol **, long, asymbol **, asymbol **); 2174 extern long _bfd_elf_get_reloc_upper_bound 2175 (bfd *, sec_ptr); 2176 extern long _bfd_elf_canonicalize_reloc 2177 (bfd *, sec_ptr, arelent **, asymbol **); 2178 extern asection * _bfd_elf_get_dynamic_reloc_section 2179 (bfd *, asection *, bfd_boolean); 2180 extern asection * _bfd_elf_make_dynamic_reloc_section 2181 (asection *, bfd *, unsigned int, bfd *, bfd_boolean); 2182 extern long _bfd_elf_get_dynamic_reloc_upper_bound 2183 (bfd *); 2184 extern long _bfd_elf_canonicalize_dynamic_reloc 2185 (bfd *, arelent **, asymbol **); 2186 extern asymbol *_bfd_elf_make_empty_symbol 2187 (bfd *); 2188 extern void _bfd_elf_get_symbol_info 2189 (bfd *, asymbol *, symbol_info *); 2190 extern bfd_boolean _bfd_elf_is_local_label_name 2191 (bfd *, const char *); 2192 extern alent *_bfd_elf_get_lineno 2193 (bfd *, asymbol *); 2194 extern bfd_boolean _bfd_elf_set_arch_mach 2195 (bfd *, enum bfd_architecture, unsigned long); 2196 extern bfd_boolean _bfd_elf_find_nearest_line 2197 (bfd *, asymbol **, asection *, bfd_vma, 2198 const char **, const char **, unsigned int *, unsigned int *); 2199 extern bfd_boolean _bfd_elf_find_line 2200 (bfd *, asymbol **, asymbol *, const char **, unsigned int *); 2201 extern bfd_boolean _bfd_elf_find_inliner_info 2202 (bfd *, const char **, const char **, unsigned int *); 2203 extern asymbol *_bfd_elf_find_function 2204 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **); 2205 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols 2206 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 2207 extern int _bfd_elf_sizeof_headers 2208 (bfd *, struct bfd_link_info *); 2209 extern bfd_boolean _bfd_elf_new_section_hook 2210 (bfd *, asection *); 2211 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section 2212 (const char *, const struct bfd_elf_special_section *, unsigned int); 2213 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr 2214 (bfd *, asection *); 2215 2216 extern bfd_boolean _bfd_elf_link_hide_sym_by_version 2217 (struct bfd_link_info *, struct elf_link_hash_entry *); 2218 2219 /* If the target doesn't have reloc handling written yet: */ 2220 extern bfd_boolean _bfd_elf_no_info_to_howto 2221 (bfd *, arelent *, Elf_Internal_Rela *); 2222 2223 extern bfd_boolean bfd_section_from_shdr 2224 (bfd *, unsigned int shindex); 2225 extern bfd_boolean bfd_section_from_phdr 2226 (bfd *, Elf_Internal_Phdr *, int); 2227 2228 extern int _bfd_elf_symbol_from_bfd_symbol 2229 (bfd *, asymbol **); 2230 2231 extern Elf_Internal_Sym *bfd_sym_from_r_symndx 2232 (struct sym_cache *, bfd *, unsigned long); 2233 extern asection *bfd_section_from_elf_index 2234 (bfd *, unsigned int); 2235 2236 extern struct elf_strtab_hash * _bfd_elf_strtab_init 2237 (void); 2238 extern void _bfd_elf_strtab_free 2239 (struct elf_strtab_hash *); 2240 extern size_t _bfd_elf_strtab_add 2241 (struct elf_strtab_hash *, const char *, bfd_boolean); 2242 extern void _bfd_elf_strtab_addref 2243 (struct elf_strtab_hash *, size_t); 2244 extern void _bfd_elf_strtab_delref 2245 (struct elf_strtab_hash *, size_t); 2246 extern unsigned int _bfd_elf_strtab_refcount 2247 (struct elf_strtab_hash *, size_t); 2248 extern void _bfd_elf_strtab_clear_all_refs 2249 (struct elf_strtab_hash *); 2250 extern void *_bfd_elf_strtab_save 2251 (struct elf_strtab_hash *); 2252 extern void _bfd_elf_strtab_restore 2253 (struct elf_strtab_hash *, void *); 2254 extern bfd_size_type _bfd_elf_strtab_size 2255 (struct elf_strtab_hash *); 2256 extern bfd_size_type _bfd_elf_strtab_len 2257 (struct elf_strtab_hash *); 2258 extern bfd_size_type _bfd_elf_strtab_offset 2259 (struct elf_strtab_hash *, size_t); 2260 extern const char * _bfd_elf_strtab_str 2261 (struct elf_strtab_hash *, size_t idx, bfd_size_type *offset); 2262 extern bfd_boolean _bfd_elf_strtab_emit 2263 (bfd *, struct elf_strtab_hash *); 2264 extern void _bfd_elf_strtab_finalize 2265 (struct elf_strtab_hash *); 2266 2267 extern bfd_boolean bfd_elf_parse_eh_frame_entries 2268 (bfd *, struct bfd_link_info *); 2269 extern bfd_boolean _bfd_elf_parse_eh_frame_entry 2270 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 2271 extern void _bfd_elf_parse_eh_frame 2272 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *); 2273 extern bfd_boolean _bfd_elf_end_eh_frame_parsing 2274 (struct bfd_link_info *info); 2275 2276 extern bfd_boolean _bfd_elf_discard_section_eh_frame 2277 (bfd *, struct bfd_link_info *, asection *, 2278 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *); 2279 extern bfd_boolean _bfd_elf_adjust_eh_frame_global_symbol 2280 (struct elf_link_hash_entry *, void *); 2281 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr 2282 (bfd *, struct bfd_link_info *); 2283 extern bfd_vma _bfd_elf_eh_frame_section_offset 2284 (bfd *, struct bfd_link_info *, asection *, bfd_vma); 2285 extern bfd_boolean _bfd_elf_write_section_eh_frame 2286 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 2287 bfd_boolean _bfd_elf_write_section_eh_frame_entry 2288 (bfd *, struct bfd_link_info *, asection *, bfd_byte *); 2289 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *); 2290 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr 2291 (bfd *, struct bfd_link_info *); 2292 extern bfd_boolean _bfd_elf_eh_frame_present 2293 (struct bfd_link_info *); 2294 extern bfd_boolean _bfd_elf_eh_frame_entry_present 2295 (struct bfd_link_info *); 2296 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr 2297 (struct bfd_link_info *); 2298 2299 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *); 2300 2301 extern long _bfd_elf_link_lookup_local_dynindx 2302 (struct bfd_link_info *, bfd *, long); 2303 extern bfd_boolean _bfd_elf_compute_section_file_positions 2304 (bfd *, struct bfd_link_info *); 2305 extern file_ptr _bfd_elf_assign_file_position_for_section 2306 (Elf_Internal_Shdr *, file_ptr, bfd_boolean); 2307 extern bfd_boolean _bfd_elf_modify_headers 2308 (bfd *, struct bfd_link_info *); 2309 2310 extern bfd_boolean _bfd_elf_validate_reloc 2311 (bfd *, arelent *); 2312 2313 extern bfd_boolean bfd_elf_record_link_assignment 2314 (bfd *, struct bfd_link_info *, const char *, bfd_boolean, 2315 bfd_boolean); 2316 extern bfd_boolean bfd_elf_stack_segment_size (bfd *, struct bfd_link_info *, 2317 const char *, bfd_vma); 2318 extern bfd_boolean bfd_elf_size_dynamic_sections 2319 (bfd *, const char *, const char *, const char *, const char *, const char *, 2320 const char * const *, struct bfd_link_info *, struct bfd_section **); 2321 extern bfd_boolean bfd_elf_size_dynsym_hash_dynstr 2322 (bfd *, struct bfd_link_info *); 2323 extern bfd_boolean bfd_elf_get_bfd_needed_list 2324 (bfd *, struct bfd_link_needed_list **); 2325 extern struct bfd_link_needed_list *bfd_elf_get_needed_list 2326 (bfd *, struct bfd_link_info *); 2327 extern void bfd_elf_set_dt_needed_name 2328 (bfd *, const char *); 2329 extern const char *bfd_elf_get_dt_soname 2330 (bfd *); 2331 extern void bfd_elf_set_dyn_lib_class 2332 (bfd *, enum dynamic_lib_link_class); 2333 extern int bfd_elf_get_dyn_lib_class 2334 (bfd *); 2335 extern struct bfd_link_needed_list *bfd_elf_get_runpath_list 2336 (bfd *, struct bfd_link_info *); 2337 extern int bfd_elf_discard_info 2338 (bfd *, struct bfd_link_info *); 2339 extern unsigned int _bfd_elf_default_action_discarded 2340 (struct bfd_section *); 2341 extern struct bfd_section *_bfd_elf_tls_setup 2342 (bfd *, struct bfd_link_info *); 2343 2344 extern bfd_boolean _bfd_elf_link_create_dynamic_sections 2345 (bfd *, struct bfd_link_info *); 2346 extern bfd_boolean _bfd_elf_omit_section_dynsym_default 2347 (bfd *, struct bfd_link_info *, asection *); 2348 extern bfd_boolean _bfd_elf_omit_section_dynsym_all 2349 (bfd *, struct bfd_link_info *, asection *); 2350 extern bfd_boolean _bfd_elf_create_dynamic_sections 2351 (bfd *, struct bfd_link_info *); 2352 extern bfd_boolean _bfd_elf_create_got_section 2353 (bfd *, struct bfd_link_info *); 2354 extern asection *_bfd_elf_section_for_symbol 2355 (struct elf_reloc_cookie *, unsigned long, bfd_boolean); 2356 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym 2357 (bfd *, struct bfd_link_info *, asection *, const char *); 2358 extern void _bfd_elf_init_1_index_section 2359 (bfd *, struct bfd_link_info *); 2360 extern void _bfd_elf_init_2_index_sections 2361 (bfd *, struct bfd_link_info *); 2362 2363 extern bfd_boolean _bfd_elfcore_make_pseudosection 2364 (bfd *, char *, size_t, ufile_ptr); 2365 extern char *_bfd_elfcore_strndup 2366 (bfd *, char *, size_t); 2367 2368 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs 2369 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean); 2370 2371 extern bfd_boolean _bfd_elf_link_output_relocs 2372 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *, 2373 struct elf_link_hash_entry **); 2374 2375 extern bfd_boolean _bfd_elf_adjust_dynamic_copy 2376 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *); 2377 2378 extern bfd_boolean _bfd_elf_dynamic_symbol_p 2379 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2380 2381 extern bfd_boolean _bfd_elf_symbol_refs_local_p 2382 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean); 2383 2384 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation 2385 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma); 2386 2387 extern bfd_boolean _bfd_elf_setup_sections 2388 (bfd *); 2389 2390 extern struct bfd_link_hash_entry *bfd_elf_define_start_stop 2391 (struct bfd_link_info *, const char *, asection *); 2392 2393 extern bfd_boolean _bfd_elf_init_file_header (bfd *, struct bfd_link_info *); 2394 2395 extern bfd_boolean _bfd_elf_final_write_processing (bfd *); 2396 2397 extern const bfd_target *bfd_elf32_object_p 2398 (bfd *); 2399 extern const bfd_target *bfd_elf32_core_file_p 2400 (bfd *); 2401 extern char *bfd_elf32_core_file_failing_command 2402 (bfd *); 2403 extern int bfd_elf32_core_file_failing_signal 2404 (bfd *); 2405 extern bfd_boolean bfd_elf32_core_file_matches_executable_p 2406 (bfd *, bfd *); 2407 extern int bfd_elf32_core_file_pid 2408 (bfd *); 2409 extern bfd_boolean _bfd_elf32_core_find_build_id 2410 (bfd *, bfd_vma); 2411 2412 extern bfd_boolean bfd_elf32_swap_symbol_in 2413 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2414 extern void bfd_elf32_swap_symbol_out 2415 (bfd *, const Elf_Internal_Sym *, void *, void *); 2416 extern void bfd_elf32_swap_reloc_in 2417 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2418 extern void bfd_elf32_swap_reloc_out 2419 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2420 extern void bfd_elf32_swap_reloca_in 2421 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2422 extern void bfd_elf32_swap_reloca_out 2423 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2424 extern void bfd_elf32_swap_phdr_in 2425 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *); 2426 extern void bfd_elf32_swap_phdr_out 2427 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *); 2428 extern void bfd_elf32_swap_dyn_in 2429 (bfd *, const void *, Elf_Internal_Dyn *); 2430 extern void bfd_elf32_swap_dyn_out 2431 (bfd *, const Elf_Internal_Dyn *, void *); 2432 extern long bfd_elf32_slurp_symbol_table 2433 (bfd *, asymbol **, bfd_boolean); 2434 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr 2435 (bfd *); 2436 extern int bfd_elf32_write_out_phdrs 2437 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2438 extern bfd_boolean bfd_elf32_checksum_contents 2439 (bfd * , void (*) (const void *, size_t, void *), void *); 2440 extern void bfd_elf32_write_relocs 2441 (bfd *, asection *, void *); 2442 extern bfd_boolean bfd_elf32_slurp_reloc_table 2443 (bfd *, asection *, asymbol **, bfd_boolean); 2444 2445 extern const bfd_target *bfd_elf64_object_p 2446 (bfd *); 2447 extern const bfd_target *bfd_elf64_core_file_p 2448 (bfd *); 2449 extern char *bfd_elf64_core_file_failing_command 2450 (bfd *); 2451 extern int bfd_elf64_core_file_failing_signal 2452 (bfd *); 2453 extern bfd_boolean bfd_elf64_core_file_matches_executable_p 2454 (bfd *, bfd *); 2455 extern int bfd_elf64_core_file_pid 2456 (bfd *); 2457 extern bfd_boolean _bfd_elf64_core_find_build_id 2458 (bfd *, bfd_vma); 2459 2460 extern bfd_boolean bfd_elf64_swap_symbol_in 2461 (bfd *, const void *, const void *, Elf_Internal_Sym *); 2462 extern void bfd_elf64_swap_symbol_out 2463 (bfd *, const Elf_Internal_Sym *, void *, void *); 2464 extern void bfd_elf64_swap_reloc_in 2465 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2466 extern void bfd_elf64_swap_reloc_out 2467 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2468 extern void bfd_elf64_swap_reloca_in 2469 (bfd *, const bfd_byte *, Elf_Internal_Rela *); 2470 extern void bfd_elf64_swap_reloca_out 2471 (bfd *, const Elf_Internal_Rela *, bfd_byte *); 2472 extern void bfd_elf64_swap_phdr_in 2473 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *); 2474 extern void bfd_elf64_swap_phdr_out 2475 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *); 2476 extern void bfd_elf64_swap_dyn_in 2477 (bfd *, const void *, Elf_Internal_Dyn *); 2478 extern void bfd_elf64_swap_dyn_out 2479 (bfd *, const Elf_Internal_Dyn *, void *); 2480 extern long bfd_elf64_slurp_symbol_table 2481 (bfd *, asymbol **, bfd_boolean); 2482 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr 2483 (bfd *); 2484 extern int bfd_elf64_write_out_phdrs 2485 (bfd *, const Elf_Internal_Phdr *, unsigned int); 2486 extern bfd_boolean bfd_elf64_checksum_contents 2487 (bfd * , void (*) (const void *, size_t, void *), void *); 2488 extern void bfd_elf64_write_relocs 2489 (bfd *, asection *, void *); 2490 extern bfd_boolean bfd_elf64_slurp_reloc_table 2491 (bfd *, asection *, asymbol **, bfd_boolean); 2492 2493 extern bfd_boolean _bfd_elf_default_relocs_compatible 2494 (const bfd_target *, const bfd_target *); 2495 2496 extern bfd_boolean _bfd_elf_relocs_compatible 2497 (const bfd_target *, const bfd_target *); 2498 extern bfd_boolean _bfd_elf_notice_as_needed 2499 (bfd *, struct bfd_link_info *, enum notice_asneeded_action); 2500 2501 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup 2502 (bfd *, struct bfd_link_info *, const char *); 2503 extern bfd_boolean bfd_elf_link_add_symbols 2504 (bfd *, struct bfd_link_info *); 2505 extern bfd_boolean _bfd_elf_add_dynamic_entry 2506 (struct bfd_link_info *, bfd_vma, bfd_vma); 2507 extern bfd_boolean _bfd_elf_link_check_relocs 2508 (bfd *, struct bfd_link_info *); 2509 2510 extern bfd_boolean bfd_elf_link_record_dynamic_symbol 2511 (struct bfd_link_info *, struct elf_link_hash_entry *); 2512 2513 extern int bfd_elf_link_record_local_dynamic_symbol 2514 (struct bfd_link_info *, bfd *, long); 2515 2516 extern bfd_boolean _bfd_elf_close_and_cleanup 2517 (bfd *); 2518 2519 extern bfd_boolean _bfd_elf_common_definition 2520 (Elf_Internal_Sym *); 2521 2522 extern unsigned int _bfd_elf_common_section_index 2523 (asection *); 2524 2525 extern asection *_bfd_elf_common_section 2526 (asection *); 2527 2528 extern bfd_vma _bfd_elf_default_got_elt_size 2529 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *, 2530 unsigned long); 2531 2532 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn 2533 (bfd *, arelent *, struct bfd_symbol *, void *, 2534 asection *, bfd *, char **); 2535 2536 extern bfd_boolean bfd_elf_final_link 2537 (bfd *, struct bfd_link_info *); 2538 2539 extern void _bfd_elf_gc_keep 2540 (struct bfd_link_info *info); 2541 2542 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol 2543 (struct elf_link_hash_entry *h, void *inf); 2544 2545 extern bfd_boolean bfd_elf_gc_sections 2546 (bfd *, struct bfd_link_info *); 2547 2548 extern bfd_boolean bfd_elf_gc_record_vtinherit 2549 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2550 2551 extern bfd_boolean bfd_elf_gc_record_vtentry 2552 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma); 2553 2554 extern asection *_bfd_elf_gc_mark_hook 2555 (asection *, struct bfd_link_info *, Elf_Internal_Rela *, 2556 struct elf_link_hash_entry *, Elf_Internal_Sym *); 2557 2558 extern asection *_bfd_elf_gc_mark_rsec 2559 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2560 struct elf_reloc_cookie *, bfd_boolean *); 2561 2562 extern bfd_boolean _bfd_elf_gc_mark_reloc 2563 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn, 2564 struct elf_reloc_cookie *); 2565 2566 extern bfd_boolean _bfd_elf_gc_mark_fdes 2567 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn, 2568 struct elf_reloc_cookie *); 2569 2570 extern bfd_boolean _bfd_elf_gc_mark 2571 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn); 2572 2573 extern bfd_boolean _bfd_elf_gc_mark_extra_sections 2574 (struct bfd_link_info *, elf_gc_mark_hook_fn); 2575 2576 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets 2577 (bfd *, struct bfd_link_info *); 2578 2579 extern bfd_boolean bfd_elf_gc_common_final_link 2580 (bfd *, struct bfd_link_info *); 2581 2582 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p 2583 (bfd_vma, void *); 2584 2585 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment 2586 (bfd *, asection *); 2587 2588 extern bfd_boolean _bfd_elf_map_sections_to_segments 2589 (bfd *, struct bfd_link_info *); 2590 2591 extern bfd_boolean _bfd_elf_is_function_type (unsigned int); 2592 2593 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *, 2594 bfd_vma *); 2595 2596 extern asection *_bfd_elf_plt_get_reloc_section (bfd *, const char *); 2597 2598 extern int bfd_elf_get_default_section_type (flagword); 2599 2600 extern bfd_boolean bfd_elf_lookup_section_flags 2601 (struct bfd_link_info *, struct flag_info *, asection *); 2602 2603 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section 2604 (bfd * abfd, asection * section); 2605 2606 /* PowerPC @tls opcode transform/validate. */ 2607 extern unsigned int _bfd_elf_ppc_at_tls_transform 2608 (unsigned int, unsigned int); 2609 /* PowerPC @tprel opcode transform/validate. */ 2610 extern unsigned int _bfd_elf_ppc_at_tprel_transform 2611 (unsigned int, unsigned int); 2612 /* PowerPC elf_object_p tweak. */ 2613 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *); 2614 /* PowerPC .gnu.attributes handling common to both 32-bit and 64-bit. */ 2615 extern bfd_boolean _bfd_elf_ppc_merge_fp_attributes 2616 (bfd *, struct bfd_link_info *); 2617 2618 /* Return an upper bound on the number of bytes required to store a 2619 copy of ABFD's program header table entries. Return -1 if an error 2620 occurs; bfd_get_error will return an appropriate code. */ 2621 extern long bfd_get_elf_phdr_upper_bound 2622 (bfd *abfd); 2623 2624 /* Copy ABFD's program header table entries to *PHDRS. The entries 2625 will be stored as an array of Elf_Internal_Phdr structures, as 2626 defined in include/elf/internal.h. To find out how large the 2627 buffer needs to be, call bfd_get_elf_phdr_upper_bound. 2628 2629 Return the number of program header table entries read, or -1 if an 2630 error occurs; bfd_get_error will return an appropriate code. */ 2631 extern int bfd_get_elf_phdrs 2632 (bfd *abfd, void *phdrs); 2633 2634 /* Exported interface for writing elf corefile notes. */ 2635 extern char *elfcore_write_note 2636 (bfd *, char *, int *, const char *, int, const void *, int); 2637 extern char *elfcore_write_prpsinfo 2638 (bfd *, char *, int *, const char *, const char *); 2639 extern char *elfcore_write_prstatus 2640 (bfd *, char *, int *, long, int, const void *); 2641 extern char * elfcore_write_pstatus 2642 (bfd *, char *, int *, long, int, const void *); 2643 extern char *elfcore_write_prfpreg 2644 (bfd *, char *, int *, const void *, int); 2645 extern char *elfcore_write_prxfpreg 2646 (bfd *, char *, int *, const void *, int); 2647 extern char *elfcore_write_xstatereg 2648 (bfd *, char *, int *, const void *, int); 2649 extern char *elfcore_write_ppc_vmx 2650 (bfd *, char *, int *, const void *, int); 2651 extern char *elfcore_write_ppc_vsx 2652 (bfd *, char *, int *, const void *, int); 2653 extern char *elfcore_write_ppc_tar 2654 (bfd *, char *, int *, const void *, int); 2655 extern char *elfcore_write_ppc_ppr 2656 (bfd *, char *, int *, const void *, int); 2657 extern char *elfcore_write_ppc_dscr 2658 (bfd *, char *, int *, const void *, int); 2659 extern char *elfcore_write_ppc_ebb 2660 (bfd *, char *, int *, const void *, int); 2661 extern char *elfcore_write_ppc_pmu 2662 (bfd *, char *, int *, const void *, int); 2663 extern char *elfcore_write_ppc_tm_cgpr 2664 (bfd *, char *, int *, const void *, int); 2665 extern char *elfcore_write_ppc_tm_cfpr 2666 (bfd *, char *, int *, const void *, int); 2667 extern char *elfcore_write_ppc_tm_cvmx 2668 (bfd *, char *, int *, const void *, int); 2669 extern char *elfcore_write_ppc_tm_cvsx 2670 (bfd *, char *, int *, const void *, int); 2671 extern char *elfcore_write_ppc_tm_spr 2672 (bfd *, char *, int *, const void *, int); 2673 extern char *elfcore_write_ppc_tm_ctar 2674 (bfd *, char *, int *, const void *, int); 2675 extern char *elfcore_write_ppc_tm_cppr 2676 (bfd *, char *, int *, const void *, int); 2677 extern char *elfcore_write_ppc_tm_cdscr 2678 (bfd *, char *, int *, const void *, int); 2679 extern char *elfcore_write_s390_timer 2680 (bfd *, char *, int *, const void *, int); 2681 extern char *elfcore_write_s390_todcmp 2682 (bfd *, char *, int *, const void *, int); 2683 extern char *elfcore_write_s390_todpreg 2684 (bfd *, char *, int *, const void *, int); 2685 extern char *elfcore_write_s390_ctrs 2686 (bfd *, char *, int *, const void *, int); 2687 extern char *elfcore_write_s390_prefix 2688 (bfd *, char *, int *, const void *, int); 2689 extern char *elfcore_write_s390_last_break 2690 (bfd *, char *, int *, const void *, int); 2691 extern char *elfcore_write_s390_system_call 2692 (bfd *, char *, int *, const void *, int); 2693 extern char *elfcore_write_s390_tdb 2694 (bfd *, char *, int *, const void *, int); 2695 extern char *elfcore_write_s390_vxrs_low 2696 (bfd *, char *, int *, const void *, int); 2697 extern char *elfcore_write_s390_vxrs_high 2698 (bfd *, char *, int *, const void *, int); 2699 extern char *elfcore_write_s390_gs_cb 2700 (bfd *, char *, int *, const void *, int); 2701 extern char *elfcore_write_s390_gs_bc 2702 (bfd *, char *, int *, const void *, int); 2703 extern char *elfcore_write_arm_vfp 2704 (bfd *, char *, int *, const void *, int); 2705 extern char *elfcore_write_aarch_tls 2706 (bfd *, char *, int *, const void *, int); 2707 extern char *elfcore_write_aarch_hw_break 2708 (bfd *, char *, int *, const void *, int); 2709 extern char *elfcore_write_aarch_hw_watch 2710 (bfd *, char *, int *, const void *, int); 2711 extern char *elfcore_write_aarch_sve 2712 (bfd *, char *, int *, const void *, int); 2713 extern char *elfcore_write_aarch_pauth 2714 (bfd *, char *, int *, const void *, int); 2715 extern char *elfcore_write_lwpstatus 2716 (bfd *, char *, int *, long, int, const void *); 2717 extern char *elfcore_write_register_note 2718 (bfd *, char *, int *, const char *, const void *, int); 2719 2720 /* Internal structure which holds information to be included in the 2721 PRPSINFO section of Linux core files. 2722 2723 This is an "internal" structure in the sense that it should be used 2724 to pass information to BFD (via the `elfcore_write_linux_prpsinfo' 2725 function), so things like endianess shouldn't be an issue. This 2726 structure will eventually be converted in one of the 2727 `elf_external_linux_*' structures and written out to an output bfd 2728 by one of the functions declared below. */ 2729 2730 struct elf_internal_linux_prpsinfo 2731 { 2732 char pr_state; /* Numeric process state. */ 2733 char pr_sname; /* Char for pr_state. */ 2734 char pr_zomb; /* Zombie. */ 2735 char pr_nice; /* Nice val. */ 2736 unsigned long pr_flag; /* Flags. */ 2737 unsigned int pr_uid; 2738 unsigned int pr_gid; 2739 int pr_pid, pr_ppid, pr_pgrp, pr_sid; 2740 char pr_fname[16 + 1]; /* Filename of executable. */ 2741 char pr_psargs[80 + 1]; /* Initial part of arg list. */ 2742 }; 2743 2744 /* Linux/most 32-bit archs. */ 2745 extern char *elfcore_write_linux_prpsinfo32 2746 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2747 2748 /* Linux/most 64-bit archs. */ 2749 extern char *elfcore_write_linux_prpsinfo64 2750 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *); 2751 2752 extern bfd *_bfd_elf32_bfd_from_remote_memory 2753 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2754 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2755 extern bfd *_bfd_elf64_bfd_from_remote_memory 2756 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep, 2757 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)); 2758 2759 extern bfd_vma bfd_elf_obj_attr_size (bfd *); 2760 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma); 2761 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int); 2762 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int); 2763 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \ 2764 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2765 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *); 2766 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \ 2767 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE)) 2768 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int, 2769 unsigned int, const char *); 2770 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \ 2771 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \ 2772 (INTVAL), (STRVAL)) 2773 2774 extern char *_bfd_elf_attr_strdup (bfd *, const char *); 2775 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *); 2776 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int); 2777 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *); 2778 extern bfd_boolean _bfd_elf_merge_object_attributes 2779 (bfd *, struct bfd_link_info *); 2780 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int); 2781 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *); 2782 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec); 2783 extern bfd_boolean elf_read_notes (bfd *, file_ptr, bfd_size_type, size_t); 2784 2785 extern bfd_boolean _bfd_elf_parse_gnu_properties 2786 (bfd *, Elf_Internal_Note *); 2787 extern elf_property * _bfd_elf_get_property 2788 (bfd *, unsigned int, unsigned int); 2789 extern bfd *_bfd_elf_link_setup_gnu_properties 2790 (struct bfd_link_info *); 2791 extern bfd_size_type _bfd_elf_convert_gnu_property_size 2792 (bfd *, bfd *); 2793 extern bfd_boolean _bfd_elf_convert_gnu_properties 2794 (bfd *, asection *, bfd *, bfd_byte **, bfd_size_type *); 2795 2796 /* The linker may need to keep track of the number of relocs that it 2797 decides to copy as dynamic relocs in check_relocs for each symbol. 2798 This is so that it can later discard them if they are found to be 2799 unnecessary. We can store the information in a field extending the 2800 regular ELF linker hash table. */ 2801 2802 struct elf_dyn_relocs 2803 { 2804 struct elf_dyn_relocs *next; 2805 2806 /* The input section of the reloc. */ 2807 asection *sec; 2808 2809 /* Total number of relocs copied for the input section. */ 2810 bfd_size_type count; 2811 2812 /* Number of pc-relative relocs copied for the input section. */ 2813 bfd_size_type pc_count; 2814 }; 2815 2816 extern bfd_boolean _bfd_elf_create_ifunc_sections 2817 (bfd *, struct bfd_link_info *); 2818 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs 2819 (struct bfd_link_info *, struct elf_link_hash_entry *, 2820 struct elf_dyn_relocs **, bfd_boolean *, unsigned int, 2821 unsigned int, unsigned int, bfd_boolean); 2822 2823 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *); 2824 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *); 2825 2826 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma); 2827 extern bfd_vma elf64_r_sym (bfd_vma); 2828 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma); 2829 extern bfd_vma elf32_r_sym (bfd_vma); 2830 2831 extern bfd_boolean is_debuginfo_file (bfd *); 2832 2833 /* Large common section. */ 2834 extern asection _bfd_elf_large_com_section; 2835 2836 /* Hash for local symbol with the first section id, ID, in the input 2837 file and the local symbol index, SYM. */ 2838 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \ 2839 (((((ID) & 0xffU) << 24) | (((ID) & 0xff00) << 8)) \ 2840 ^ (SYM) ^ (((ID) & 0xffff0000U) >> 16)) 2841 2842 /* This is the condition under which finish_dynamic_symbol will be called. 2843 If our finish_dynamic_symbol isn't called, we'll need to do something 2844 about initializing any .plt and .got entries in relocate_section. */ 2845 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ 2846 ((DYN) \ 2847 && ((SHARED) || !(H)->forced_local) \ 2848 && ((H)->dynindx != -1 || (H)->forced_local)) 2849 2850 /* This macro is to avoid lots of duplicated code in the body 2851 of xxx_relocate_section() in the various elfxx-xxxx.c files. */ 2852 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \ 2853 r_symndx, symtab_hdr, sym_hashes, \ 2854 h, sec, relocation, \ 2855 unresolved_reloc, warned, ignored) \ 2856 do \ 2857 { \ 2858 /* It seems this can happen with erroneous or unsupported \ 2859 input (mixing a.out and elf in an archive, for example.) */ \ 2860 if (sym_hashes == NULL) \ 2861 return FALSE; \ 2862 \ 2863 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \ 2864 \ 2865 if (info->wrap_hash != NULL \ 2866 && (input_section->flags & SEC_DEBUGGING) != 0) \ 2867 h = ((struct elf_link_hash_entry *) \ 2868 unwrap_hash_lookup (info, input_bfd, &h->root)); \ 2869 \ 2870 while (h->root.type == bfd_link_hash_indirect \ 2871 || h->root.type == bfd_link_hash_warning) \ 2872 h = (struct elf_link_hash_entry *) h->root.u.i.link; \ 2873 \ 2874 warned = FALSE; \ 2875 ignored = FALSE; \ 2876 unresolved_reloc = FALSE; \ 2877 relocation = 0; \ 2878 if (h->root.type == bfd_link_hash_defined \ 2879 || h->root.type == bfd_link_hash_defweak) \ 2880 { \ 2881 sec = h->root.u.def.section; \ 2882 if (sec == NULL \ 2883 || sec->output_section == NULL) \ 2884 /* Set a flag that will be cleared later if we find a \ 2885 relocation value for this symbol. output_section \ 2886 is typically NULL for symbols satisfied by a shared \ 2887 library. */ \ 2888 unresolved_reloc = TRUE; \ 2889 else \ 2890 relocation = (h->root.u.def.value \ 2891 + sec->output_section->vma \ 2892 + sec->output_offset); \ 2893 } \ 2894 else if (h->root.type == bfd_link_hash_undefweak) \ 2895 ; \ 2896 else if (info->unresolved_syms_in_objects == RM_IGNORE \ 2897 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \ 2898 ignored = TRUE; \ 2899 else if (!bfd_link_relocatable (info)) \ 2900 { \ 2901 bfd_boolean err; \ 2902 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \ 2903 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \ 2904 (*info->callbacks->undefined_symbol) (info, \ 2905 h->root.root.string, \ 2906 input_bfd, \ 2907 input_section, \ 2908 rel->r_offset, err); \ 2909 warned = TRUE; \ 2910 } \ 2911 (void) unresolved_reloc; \ 2912 (void) warned; \ 2913 (void) ignored; \ 2914 } \ 2915 while (0) 2916 2917 /* This macro is to avoid lots of duplicated code in the body of the 2918 loop over relocations in xxx_relocate_section() in the various 2919 elfxx-xxxx.c files. 2920 2921 Handle relocations against symbols from removed linkonce sections, 2922 or sections discarded by a linker script. When doing a relocatable 2923 link, we remove such relocations. Otherwise, we just want the 2924 section contents zeroed and avoid any special processing. */ 2925 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \ 2926 rel, count, relend, \ 2927 howto, index, contents) \ 2928 { \ 2929 int i_; \ 2930 _bfd_clear_contents (howto, input_bfd, input_section, \ 2931 contents, rel[index].r_offset); \ 2932 \ 2933 if (bfd_link_relocatable (info) \ 2934 && (input_section->flags & SEC_DEBUGGING)) \ 2935 { \ 2936 /* Only remove relocations in debug sections since other \ 2937 sections may require relocations. */ \ 2938 Elf_Internal_Shdr *rel_hdr; \ 2939 \ 2940 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \ 2941 \ 2942 /* Avoid empty output section. */ \ 2943 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \ 2944 { \ 2945 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2946 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \ 2947 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 2948 \ 2949 memmove (rel, rel + count, \ 2950 (relend - rel - count) * sizeof (*rel)); \ 2951 \ 2952 input_section->reloc_count -= count; \ 2953 relend -= count; \ 2954 rel--; \ 2955 continue; \ 2956 } \ 2957 } \ 2958 \ 2959 for (i_ = 0; i_ < count; i_++) \ 2960 { \ 2961 rel[i_].r_info = 0; \ 2962 rel[i_].r_addend = 0; \ 2963 } \ 2964 rel += count - 1; \ 2965 continue; \ 2966 } 2967 2968 /* Will a symbol be bound to the definition within the shared 2969 library, if any. A unique symbol can never be bound locally. */ 2970 #define SYMBOLIC_BIND(INFO, H) \ 2971 (!(H)->unique_global \ 2972 && ((INFO)->symbolic \ 2973 || (H)->start_stop \ 2974 || ((INFO)->dynamic && !(H)->dynamic))) 2975 2976 /* Determine if a section contains CTF data, using its name. */ 2977 static inline bfd_boolean 2978 bfd_section_is_ctf (const asection *sec) 2979 { 2980 const char *name = bfd_section_name (sec); 2981 return strncmp (name, ".ctf", 4) == 0 && (name[4] == 0 || name[4] == '.'); 2982 } 2983 2984 #ifdef __cplusplus 2985 } 2986 #endif 2987 #endif /* _LIBELF_H_ */ 2988