1 /* BFD back-end data structures for ELF files.
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 Written by Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
25 #include "elf/common.h"
26 #include "elf/internal.h"
27 #include "elf/external.h"
30 /* The number of entries in a section is its size divided by the size
31 of a single entry. This is normally only applicable to reloc and
32 symbol table sections. */
33 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_size / (shdr)->sh_entsize)
35 /* If size isn't specified as 64 or 32, NAME macro should fail. */
38 #define NAME(x, y) x ## 64 ## _ ## y
41 #define NAME(x, y) x ## 32 ## _ ## y
46 #define NAME(x, y) x ## NOSIZE ## _ ## y
49 #define ElfNAME(X) NAME(Elf,X)
50 #define elfNAME(X) NAME(elf,X)
52 /* Information held for an ELF symbol. The first field is the
53 corresponding asymbol. Every symbol is an ELF file is actually a
54 pointer to this structure, although it is often handled as a
55 pointer to an asymbol. */
61 /* ELF symbol information. */
62 Elf_Internal_Sym internal_elf_sym;
63 /* Backend specific information. */
66 unsigned int hppa_arg_reloc;
72 /* Version information. This is from an Elf_Internal_Versym
73 structure in a SHT_GNU_versym section. It is zero if there is no
74 version information. */
75 unsigned short version;
79 struct elf_strtab_hash;
83 /* ELF linker hash table entries. */
85 struct elf_link_hash_entry
87 struct bfd_link_hash_entry root;
89 /* Symbol index in output file. This is initialized to -1. It is
90 set to -2 if the symbol is used by a reloc. */
93 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
94 -1 if this is not a dynamic symbol. */
95 /* ??? Note that this is consistently used as a synonym for tests
96 against whether we can perform various simplifying transformations
97 to the code. (E.g. changing a pc-relative jump to a PLT entry
98 into a pc-relative jump to the target function.) That test, which
99 is often relatively complex, and someplaces wrong or incomplete,
100 should really be replaced by a predicate in elflink.c.
102 End result: this field -1 does not indicate that the symbol is
103 not in the dynamic symbol table, but rather that the symbol is
104 not visible outside this DSO. */
107 /* If this symbol requires an entry in the global offset table, the
108 processor specific backend uses this field to track usage and
109 final offset. Two schemes are supported: The first assumes that
110 a symbol may only have one GOT entry, and uses REFCOUNT until
111 size_dynamic_sections, at which point the contents of the .got is
112 fixed. Afterward, if OFFSET is -1, then the symbol does not
113 require a global offset table entry. The second scheme allows
114 multiple GOT entries per symbol, managed via a linked list
115 pointed to by GLIST. */
118 bfd_signed_vma refcount;
120 struct got_entry *glist;
121 struct plt_entry *plist;
124 /* Same, but tracks a procedure linkage table entry. */
125 union gotplt_union plt;
130 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
131 unsigned int type : 8;
133 /* Symbol st_other value, symbol visibility. */
134 unsigned int other : 8;
136 /* Symbol is referenced by a non-shared object. */
137 unsigned int ref_regular : 1;
138 /* Symbol is defined by a non-shared object. */
139 unsigned int def_regular : 1;
140 /* Symbol is referenced by a shared object. */
141 unsigned int ref_dynamic : 1;
142 /* Symbol is defined by a shared object. */
143 unsigned int def_dynamic : 1;
144 /* Symbol has a non-weak reference from a non-shared object. */
145 unsigned int ref_regular_nonweak : 1;
146 /* Dynamic symbol has been adjustd. */
147 unsigned int dynamic_adjusted : 1;
148 /* Symbol needs a copy reloc. */
149 unsigned int needs_copy : 1;
150 /* Symbol needs a procedure linkage table entry. */
151 unsigned int needs_plt : 1;
152 /* Symbol appears in a non-ELF input file. */
153 unsigned int non_elf : 1;
154 /* Symbol should be marked as hidden in the version information. */
155 unsigned int hidden : 1;
156 /* Symbol was forced to local scope due to a version script file. */
157 unsigned int forced_local : 1;
158 /* Symbol was forced to be dynamic due to a version script file. */
159 unsigned int dynamic : 1;
160 /* Symbol was marked during garbage collection. */
161 unsigned int mark : 1;
162 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
163 not currently set by all the backends. */
164 unsigned int non_got_ref : 1;
165 /* Symbol has a definition in a shared object.
166 FIXME: There is no real need for this field if def_dynamic is never
167 cleared and all places that test def_dynamic also test def_regular. */
168 unsigned int dynamic_def : 1;
169 /* Symbol is weak in all shared objects. */
170 unsigned int dynamic_weak : 1;
171 /* Symbol is referenced with a relocation where C/C++ pointer equality
173 unsigned int pointer_equality_needed : 1;
175 /* String table index in .dynstr if this is a dynamic symbol. */
176 unsigned long dynstr_index;
180 /* If this is a weak defined symbol from a dynamic object, this
181 field points to a defined symbol with the same value, if there is
182 one. Otherwise it is NULL. */
183 struct elf_link_hash_entry *weakdef;
185 /* Hash value of the name computed using the ELF hash function.
186 Used part way through size_dynamic_sections, after we've finished
188 unsigned long elf_hash_value;
191 /* Version information. */
194 /* This field is used for a symbol which is not defined in a
195 regular object. It points to the version information read in
196 from the dynamic object. */
197 Elf_Internal_Verdef *verdef;
198 /* This field is used for a symbol which is defined in a regular
199 object. It is set up in size_dynamic_sections. It points to
200 the version information we should write out for this symbol. */
201 struct bfd_elf_version_tree *vertree;
206 /* Virtual table entry use information. This array is nominally of size
207 size/sizeof(target_void_pointer), though we have to be able to assume
208 and track a size while the symbol is still undefined. It is indexed
209 via offset/sizeof(target_void_pointer). */
213 /* Virtual table derivation info. */
214 struct elf_link_hash_entry *parent;
218 /* Will references to this symbol always reference the symbol
219 in this object? STV_PROTECTED is excluded from the visibility test
220 here so that function pointer comparisons work properly. Since
221 function symbols not defined in an app are set to their .plt entry,
222 it's necessary for shared libs to also reference the .plt even
223 though the symbol is really local to the shared lib. */
224 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
225 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
227 /* Will _calls_ to this symbol always call the version in this object? */
228 #define SYMBOL_CALLS_LOCAL(INFO, H) \
229 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
231 /* Common symbols that are turned into definitions don't have the
232 DEF_REGULAR flag set, so they might appear to be undefined. */
233 #define ELF_COMMON_DEF_P(H) \
235 && !(H)->def_dynamic \
236 && (H)->root.type == bfd_link_hash_defined)
238 /* Records local symbols to be emitted in the dynamic symbol table. */
240 struct elf_link_local_dynamic_entry
242 struct elf_link_local_dynamic_entry *next;
244 /* The input bfd this symbol came from. */
247 /* The index of the local symbol being copied. */
250 /* The index in the outgoing dynamic symbol table. */
253 /* A copy of the input symbol. */
254 Elf_Internal_Sym isym;
257 struct elf_link_loaded_list
259 struct elf_link_loaded_list *next;
263 /* Structures used by the eh_frame optimization code. */
266 /* For FDEs, this points to the CIE used. */
267 struct eh_cie_fde *cie_inf;
270 unsigned int new_offset;
271 unsigned char fde_encoding;
272 unsigned char lsda_encoding;
273 unsigned char lsda_offset;
274 unsigned int cie : 1;
275 unsigned int removed : 1;
276 unsigned int add_augmentation_size : 1;
277 unsigned int add_fde_encoding : 1;
278 unsigned int make_relative : 1;
279 unsigned int make_lsda_relative : 1;
280 unsigned int need_lsda_relative : 1;
281 unsigned int per_encoding_relative : 1;
282 unsigned int *set_loc;
285 struct eh_frame_sec_info
288 struct eh_cie_fde entry[1];
291 struct eh_frame_array_ent
299 struct eh_frame_hdr_info
303 unsigned int fde_count, array_count;
304 struct eh_frame_array_ent *array;
305 /* TRUE if .eh_frame_hdr should contain the sorted search table.
306 We build it if we successfully read all .eh_frame input sections
307 and recognize them. */
309 bfd_boolean offsets_adjusted;
312 /* ELF linker hash table. */
314 struct elf_link_hash_table
316 struct bfd_link_hash_table root;
318 /* Whether we have created the special dynamic sections required
319 when linking against or generating a shared object. */
320 bfd_boolean dynamic_sections_created;
322 /* True if this target has relocatable executables, so needs dynamic
324 bfd_boolean is_relocatable_executable;
326 /* The BFD used to hold special sections created by the linker.
327 This will be the first BFD found which requires these sections to
331 /* The value to use when initialising got.refcount/offset and
332 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
333 the values are refcounts. Set to init_got_offset/init_plt_offset
334 in size_dynamic_sections when the values may be offsets. */
335 union gotplt_union init_got_refcount;
336 union gotplt_union init_plt_refcount;
338 /* The value to use for got.refcount/offset and plt.refcount/offset
339 when the values may be offsets. Normally (bfd_vma) -1. */
340 union gotplt_union init_got_offset;
341 union gotplt_union init_plt_offset;
343 /* The number of symbols found in the link which must be put into
344 the .dynsym section. */
345 bfd_size_type dynsymcount;
347 /* The string table of dynamic symbols, which becomes the .dynstr
349 struct elf_strtab_hash *dynstr;
351 /* The number of buckets in the hash table in the .hash section.
352 This is based on the number of dynamic symbols. */
353 bfd_size_type bucketcount;
355 /* A linked list of DT_NEEDED names found in dynamic objects
356 included in the link. */
357 struct bfd_link_needed_list *needed;
359 /* Sections in the output bfd that provides a section symbol
360 to be used by relocations emitted against local symbols.
361 Most targets will not use data_index_section. */
362 asection *text_index_section;
363 asection *data_index_section;
365 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
366 struct elf_link_hash_entry *hgot;
368 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
369 struct elf_link_hash_entry *hplt;
371 /* A pointer to information used to merge SEC_MERGE sections. */
374 /* Used to link stabs in sections. */
375 struct stab_info stab_info;
377 /* Used by eh_frame code when editing .eh_frame. */
378 struct eh_frame_hdr_info eh_info;
380 /* A linked list of local symbols to be added to .dynsym. */
381 struct elf_link_local_dynamic_entry *dynlocal;
383 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
384 objects included in the link. */
385 struct bfd_link_needed_list *runpath;
387 /* Cached first output tls section and size of PT_TLS segment. */
389 bfd_size_type tls_size;
391 /* A linked list of BFD's loaded in the link. */
392 struct elf_link_loaded_list *loaded;
395 /* Look up an entry in an ELF linker hash table. */
397 #define elf_link_hash_lookup(table, string, create, copy, follow) \
398 ((struct elf_link_hash_entry *) \
399 bfd_link_hash_lookup (&(table)->root, (string), (create), \
402 /* Traverse an ELF linker hash table. */
404 #define elf_link_hash_traverse(table, func, info) \
405 (bfd_link_hash_traverse \
407 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
410 /* Get the ELF linker hash table from a link_info structure. */
412 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
414 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
415 #define is_elf_hash_table(htab) \
416 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
418 /* Used by bfd_section_from_r_symndx to cache a small number of local
419 symbol to section mappings. */
420 #define LOCAL_SYM_CACHE_SIZE 32
424 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
425 asection *sec[LOCAL_SYM_CACHE_SIZE];
428 /* Constant information held for an ELF backend. */
430 struct elf_size_info {
431 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
432 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
434 /* The size of entries in the .hash section. */
435 unsigned char sizeof_hash_entry;
437 /* The number of internal relocations to allocate per external
439 unsigned char int_rels_per_ext_rel;
440 /* We use some fixed size arrays. This should be large enough to
441 handle all back-ends. */
442 #define MAX_INT_RELS_PER_EXT_REL 3
444 unsigned char arch_size, log_file_align;
445 unsigned char elfclass, ev_current;
446 int (*write_out_phdrs)
447 (bfd *, const Elf_Internal_Phdr *, unsigned int);
449 (*write_shdrs_and_ehdr) (bfd *);
451 (bfd *, asection *, void *);
452 bfd_boolean (*swap_symbol_in)
453 (bfd *, const void *, const void *, Elf_Internal_Sym *);
454 void (*swap_symbol_out)
455 (bfd *, const Elf_Internal_Sym *, void *, void *);
456 bfd_boolean (*slurp_reloc_table)
457 (bfd *, asection *, asymbol **, bfd_boolean);
458 long (*slurp_symbol_table)
459 (bfd *, asymbol **, bfd_boolean);
461 (bfd *, const void *, Elf_Internal_Dyn *);
463 (bfd *, const Elf_Internal_Dyn *, void *);
465 /* This function is called to swap in a REL relocation. If an
466 external relocation corresponds to more than one internal
467 relocation, then all relocations are swapped in at once. */
468 void (*swap_reloc_in)
469 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
471 /* This function is called to swap out a REL relocation. */
472 void (*swap_reloc_out)
473 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
475 /* This function is called to swap in a RELA relocation. If an
476 external relocation corresponds to more than one internal
477 relocation, then all relocations are swapped in at once. */
478 void (*swap_reloca_in)
479 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
481 /* This function is called to swap out a RELA relocation. */
482 void (*swap_reloca_out)
483 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
486 #define elf_symbol_from(ABFD,S) \
487 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
488 && (S)->the_bfd->tdata.elf_obj_data != 0) \
489 ? (elf_symbol_type *) (S) \
492 enum elf_reloc_type_class {
494 reloc_class_relative,
499 struct elf_reloc_cookie
501 Elf_Internal_Rela *rels, *rel, *relend;
502 Elf_Internal_Sym *locsyms;
506 struct elf_link_hash_entry **sym_hashes;
508 bfd_boolean bad_symtab;
511 /* The level of IRIX compatibility we're striving for. */
519 /* Mapping of ELF section names and types. */
520 struct bfd_elf_special_section
524 /* 0 means name must match PREFIX exactly.
525 -1 means name must start with PREFIX followed by an arbitrary string.
526 -2 means name must match PREFIX exactly or consist of PREFIX followed
527 by a dot then anything.
528 > 0 means name must start with the first PREFIX_LENGTH chars of
529 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
535 enum action_discarded
541 typedef asection * (*elf_gc_mark_hook_fn)
542 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
543 struct elf_link_hash_entry *, Elf_Internal_Sym *);
545 struct elf_backend_data
547 /* The architecture for this backend. */
548 enum bfd_architecture arch;
550 /* The ELF machine code (EM_xxxx) for this backend. */
551 int elf_machine_code;
556 /* The maximum page size for this backend. */
559 /* The minimum page size for this backend. An input object will not be
560 considered page aligned unless its sections are correctly aligned for
561 pages at least this large. May be smaller than maxpagesize. */
564 /* The common page size for this backend. */
565 bfd_vma commonpagesize;
567 /* The BFD flags applied to sections created for dynamic linking. */
568 flagword dynamic_sec_flags;
570 /* A function to translate an ELF RELA relocation to a BFD arelent
572 void (*elf_info_to_howto)
573 (bfd *, arelent *, Elf_Internal_Rela *);
575 /* A function to translate an ELF REL relocation to a BFD arelent
577 void (*elf_info_to_howto_rel)
578 (bfd *, arelent *, Elf_Internal_Rela *);
580 /* A function to determine whether a symbol is global when
581 partitioning the symbol table into local and global symbols.
582 This should be NULL for most targets, in which case the correct
583 thing will be done. MIPS ELF, at least on the Irix 5, has
584 special requirements. */
585 bfd_boolean (*elf_backend_sym_is_global)
588 /* The remaining functions are hooks which are called only if they
591 /* A function to permit a backend specific check on whether a
592 particular BFD format is relevant for an object file, and to
593 permit the backend to set any global information it wishes. When
594 this is called elf_elfheader is set, but anything else should be
595 used with caution. If this returns FALSE, the check_format
596 routine will return a bfd_error_wrong_format error. */
597 bfd_boolean (*elf_backend_object_p)
600 /* A function to do additional symbol processing when reading the
601 ELF symbol table. This is where any processor-specific special
602 section indices are handled. */
603 void (*elf_backend_symbol_processing)
606 /* A function to do additional symbol processing after reading the
607 entire ELF symbol table. */
608 bfd_boolean (*elf_backend_symbol_table_processing)
609 (bfd *, elf_symbol_type *, unsigned int);
611 /* A function to set the type of the info field. Processor-specific
612 types should be handled here. */
613 int (*elf_backend_get_symbol_type)
614 (Elf_Internal_Sym *, int);
616 /* A function to return the linker hash table entry of a symbol that
617 might be satisfied by an archive symbol. */
618 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
619 (bfd *, struct bfd_link_info *, const char *);
621 /* Return true if local section symbols should have a non-null st_name.
622 NULL implies false. */
623 bfd_boolean (*elf_backend_name_local_section_symbols)
626 /* A function to do additional processing on the ELF section header
627 just before writing it out. This is used to set the flags and
628 type fields for some sections, or to actually write out data for
630 bfd_boolean (*elf_backend_section_processing)
631 (bfd *, Elf_Internal_Shdr *);
633 /* A function to handle unusual section types when creating BFD
634 sections from ELF sections. */
635 bfd_boolean (*elf_backend_section_from_shdr)
636 (bfd *, Elf_Internal_Shdr *, const char *, int);
638 /* A function to convert machine dependent ELF section header flags to
639 BFD internal section header flags. */
640 bfd_boolean (*elf_backend_section_flags)
641 (flagword *, const Elf_Internal_Shdr *);
643 /* A function that returns a struct containing ELF section flags and
644 type for the given BFD section. */
645 const struct bfd_elf_special_section * (*get_sec_type_attr)
648 /* A function to handle unusual program segment types when creating BFD
649 sections from ELF program segments. */
650 bfd_boolean (*elf_backend_section_from_phdr)
651 (bfd *, Elf_Internal_Phdr *, int, const char *);
653 /* A function to set up the ELF section header for a BFD section in
654 preparation for writing it out. This is where the flags and type
655 fields are set for unusual sections. */
656 bfd_boolean (*elf_backend_fake_sections)
657 (bfd *, Elf_Internal_Shdr *, asection *);
659 /* A function to get the ELF section index for a BFD section. If
660 this returns TRUE, the section was found. If it is a normal ELF
661 section, *RETVAL should be left unchanged. If it is not a normal
662 ELF section *RETVAL should be set to the SHN_xxxx index. */
663 bfd_boolean (*elf_backend_section_from_bfd_section)
664 (bfd *, asection *, int *retval);
666 /* If this field is not NULL, it is called by the add_symbols phase
667 of a link just before adding a symbol to the global linker hash
668 table. It may modify any of the fields as it wishes. If *NAME
669 is set to NULL, the symbol will be skipped rather than being
670 added to the hash table. This function is responsible for
671 handling all processor dependent symbol bindings and section
672 indices, and must set at least *FLAGS and *SEC for each processor
673 dependent case; failure to do so will cause a link error. */
674 bfd_boolean (*elf_add_symbol_hook)
675 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
676 const char **name, flagword *flags, asection **sec, bfd_vma *value);
678 /* If this field is not NULL, it is called by the elf_link_output_sym
679 phase of a link for each symbol which will appear in the object file. */
680 bfd_boolean (*elf_backend_link_output_symbol_hook)
681 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
682 asection *, struct elf_link_hash_entry *);
684 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
685 linker the first time it encounters a dynamic object in the link.
686 This function must create any sections required for dynamic
687 linking. The ABFD argument is a dynamic object. The .interp,
688 .dynamic, .dynsym, .dynstr, and .hash functions have already been
689 created, and this function may modify the section flags if
690 desired. This function will normally create the .got and .plt
691 sections, but different backends have different requirements. */
692 bfd_boolean (*elf_backend_create_dynamic_sections)
693 (bfd *abfd, struct bfd_link_info *info);
695 /* When creating a shared library, determine whether to omit the
696 dynamic symbol for the section. */
697 bfd_boolean (*elf_backend_omit_section_dynsym)
698 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
700 /* Return TRUE if relocations of targets are compatible to the extent
701 that CHECK_RELOCS will properly process them. PR 4424. */
702 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
704 /* The CHECK_RELOCS function is called by the add_symbols phase of
705 the ELF backend linker. It is called once for each section with
706 relocs of an object file, just after the symbols for the object
707 file have been added to the global linker hash table. The
708 function must look through the relocs and do any special handling
709 required. This generally means allocating space in the global
710 offset table, and perhaps allocating space for a reloc. The
711 relocs are always passed as Rela structures; if the section
712 actually uses Rel structures, the r_addend field will always be
714 bfd_boolean (*check_relocs)
715 (bfd *abfd, struct bfd_link_info *info, asection *o,
716 const Elf_Internal_Rela *relocs);
718 /* The CHECK_DIRECTIVES function is called once per input file by
719 the add_symbols phase of the ELF backend linker. The function
720 must inspect the bfd and create any additional symbols according
721 to any custom directives in the bfd. */
722 bfd_boolean (*check_directives)
723 (bfd *abfd, struct bfd_link_info *info);
725 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
726 input file that was not needed by the add_symbols phase of the
727 ELF backend linker. The function must undo any target specific
728 changes in the symbol hash table. */
729 bfd_boolean (*as_needed_cleanup)
730 (bfd *abfd, struct bfd_link_info *info);
732 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
733 linker for every symbol which is defined by a dynamic object and
734 referenced by a regular object. This is called after all the
735 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
736 function has been called. The hash table entry should be
737 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
738 defined in a section from a dynamic object. Dynamic object
739 sections are not included in the final link, and this function is
740 responsible for changing the value to something which the rest of
741 the link can deal with. This will normally involve adding an
742 entry to the .plt or .got or some such section, and setting the
743 symbol to point to that. */
744 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
745 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
747 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
748 after all the linker input files have been seen but before the
749 section sizes have been set. This is called after
750 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
751 bfd_boolean (*elf_backend_always_size_sections)
752 (bfd *output_bfd, struct bfd_link_info *info);
754 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
755 linker after all the linker input files have been seen but before
756 the sections sizes have been set. This is called after
757 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
758 It is only called when linking against a dynamic object. It must
759 set the sizes of the dynamic sections, and may fill in their
760 contents as well. The generic ELF linker can handle the .dynsym,
761 .dynstr and .hash sections. This function must handle the
762 .interp section and any sections created by the
763 CREATE_DYNAMIC_SECTIONS entry point. */
764 bfd_boolean (*elf_backend_size_dynamic_sections)
765 (bfd *output_bfd, struct bfd_link_info *info);
767 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
768 we keep to use as a base for relocs and symbols. */
769 void (*elf_backend_init_index_section)
770 (bfd *output_bfd, struct bfd_link_info *info);
772 /* The RELOCATE_SECTION function is called by the ELF backend linker
773 to handle the relocations for a section.
775 The relocs are always passed as Rela structures; if the section
776 actually uses Rel structures, the r_addend field will always be
779 This function is responsible for adjust the section contents as
780 necessary, and (if using Rela relocs and generating a
781 relocatable output file) adjusting the reloc addend as
784 This function does not have to worry about setting the reloc
785 address or the reloc symbol index.
787 LOCAL_SYMS is a pointer to the swapped in local symbols.
789 LOCAL_SECTIONS is an array giving the section in the input file
790 corresponding to the st_shndx field of each local symbol.
792 The global hash table entry for the global symbols can be found
793 via elf_sym_hashes (input_bfd).
795 When generating relocatable output, this function must handle
796 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
797 going to be the section symbol corresponding to the output
798 section, which means that the addend must be adjusted
801 Returns FALSE on error, TRUE on success, 2 if successful and
802 relocations should be written for this section. */
803 int (*elf_backend_relocate_section)
804 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
805 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
806 Elf_Internal_Sym *local_syms, asection **local_sections);
808 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
809 linker just before it writes a symbol out to the .dynsym section.
810 The processor backend may make any required adjustment to the
811 symbol. It may also take the opportunity to set contents of the
812 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
813 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
814 on those symbols which are defined by a dynamic object. */
815 bfd_boolean (*elf_backend_finish_dynamic_symbol)
816 (bfd *output_bfd, struct bfd_link_info *info,
817 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
819 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
820 linker just before it writes all the dynamic sections out to the
821 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
822 all dynamic symbols. */
823 bfd_boolean (*elf_backend_finish_dynamic_sections)
824 (bfd *output_bfd, struct bfd_link_info *info);
826 /* A function to do any beginning processing needed for the ELF file
827 before building the ELF headers and computing file positions. */
828 void (*elf_backend_begin_write_processing)
829 (bfd *, struct bfd_link_info *);
831 /* A function to do any final processing needed for the ELF file
832 before writing it out. The LINKER argument is TRUE if this BFD
833 was created by the ELF backend linker. */
834 void (*elf_backend_final_write_processing)
835 (bfd *, bfd_boolean linker);
837 /* This function is called by get_program_header_size. It should
838 return the number of additional program segments which this BFD
839 will need. It should return -1 on error. */
840 int (*elf_backend_additional_program_headers)
841 (bfd *, struct bfd_link_info *);
843 /* This function is called to modify an existing segment map in a
844 backend specific fashion. */
845 bfd_boolean (*elf_backend_modify_segment_map)
846 (bfd *, struct bfd_link_info *);
848 /* This function is called to modify program headers just before
850 bfd_boolean (*elf_backend_modify_program_headers)
851 (bfd *, struct bfd_link_info *);
853 /* This function is called during section garbage collection to
854 mark sections that define global symbols. */
855 bfd_boolean (*gc_mark_dynamic_ref)
856 (struct elf_link_hash_entry *h, void *inf);
858 /* This function is called during section gc to discover the section a
859 particular relocation refers to. */
860 elf_gc_mark_hook_fn gc_mark_hook;
862 /* This function, if defined, is called after the first gc marking pass
863 to allow the backend to mark additional sections. */
864 bfd_boolean (*gc_mark_extra_sections)
865 (struct bfd_link_info *info, elf_gc_mark_hook_fn gc_mark_hook);
867 /* This function, if defined, is called during the sweep phase of gc
868 in order that a backend might update any data structures it might
870 bfd_boolean (*gc_sweep_hook)
871 (bfd *abfd, struct bfd_link_info *info, asection *o,
872 const Elf_Internal_Rela *relocs);
874 /* This function, if defined, is called after the ELF headers have
875 been created. This allows for things like the OS and ABI versions
877 void (*elf_backend_post_process_headers)
878 (bfd *, struct bfd_link_info *);
880 /* This function, if defined, prints a symbol to file and returns the
881 name of the symbol to be printed. It should return NULL to fall
882 back to default symbol printing. */
883 const char *(*elf_backend_print_symbol_all)
884 (bfd *, void *, asymbol *);
886 /* This function, if defined, is called after all local symbols and
887 global symbols converted to locals are emitted into the symtab
888 section. It allows the backend to emit special local symbols
889 not handled in the hash table. */
890 bfd_boolean (*elf_backend_output_arch_local_syms)
891 (bfd *, struct bfd_link_info *, void *,
892 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
893 struct elf_link_hash_entry *));
895 /* This function, if defined, is called after all symbols are emitted
896 into the symtab section. It allows the backend to emit special
897 global symbols not handled in the hash table. */
898 bfd_boolean (*elf_backend_output_arch_syms)
899 (bfd *, struct bfd_link_info *, void *,
900 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
901 struct elf_link_hash_entry *));
903 /* Copy any information related to dynamic linking from a pre-existing
904 symbol to a newly created symbol. Also called to copy flags and
905 other back-end info to a weakdef, in which case the symbol is not
906 newly created and plt/got refcounts and dynamic indices should not
908 void (*elf_backend_copy_indirect_symbol)
909 (struct bfd_link_info *, struct elf_link_hash_entry *,
910 struct elf_link_hash_entry *);
912 /* Modify any information related to dynamic linking such that the
913 symbol is not exported. */
914 void (*elf_backend_hide_symbol)
915 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
917 /* A function to do additional symbol fixup, called by
918 _bfd_elf_fix_symbol_flags. */
919 bfd_boolean (*elf_backend_fixup_symbol)
920 (struct bfd_link_info *, struct elf_link_hash_entry *);
922 /* Merge the backend specific symbol attribute. */
923 void (*elf_backend_merge_symbol_attribute)
924 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
927 /* Decide whether an undefined symbol is special and can be ignored.
928 This is the case for OPTIONAL symbols on IRIX. */
929 bfd_boolean (*elf_backend_ignore_undef_symbol)
930 (struct elf_link_hash_entry *);
932 /* Emit relocations. Overrides default routine for emitting relocs,
933 except during a relocatable link, or if all relocs are being emitted. */
934 bfd_boolean (*elf_backend_emit_relocs)
935 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
936 struct elf_link_hash_entry **);
938 /* Count relocations. Not called for relocatable links
939 or if all relocs are being preserved in the output. */
940 unsigned int (*elf_backend_count_relocs)
941 (asection *, Elf_Internal_Rela *);
943 /* This function, if defined, is called when an NT_PRSTATUS note is found
945 bfd_boolean (*elf_backend_grok_prstatus)
946 (bfd *, Elf_Internal_Note *);
948 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
949 note is found in a core file. */
950 bfd_boolean (*elf_backend_grok_psinfo)
951 (bfd *, Elf_Internal_Note *);
953 /* This function, if defined, is called to write a note to a corefile. */
954 char *(*elf_backend_write_core_note)
955 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
957 /* Functions to print VMAs. Special code to handle 64 bit ELF files. */
958 void (* elf_backend_sprintf_vma)
959 (bfd *, char *, bfd_vma);
960 void (* elf_backend_fprintf_vma)
961 (bfd *, void *, bfd_vma);
963 /* This function returns class of a reloc type. */
964 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
965 (const Elf_Internal_Rela *);
967 /* This function, if defined, removes information about discarded functions
968 from other sections which mention them. */
969 bfd_boolean (*elf_backend_discard_info)
970 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
972 /* This function, if defined, signals that the function above has removed
973 the discarded relocations for this section. */
974 bfd_boolean (*elf_backend_ignore_discarded_relocs)
977 /* What to do when ld finds relocations against symbols defined in
978 discarded sections. */
979 unsigned int (*action_discarded)
982 /* This function returns the width of FDE pointers in bytes, or 0 if
983 that can't be determined for some reason. The default definition
984 goes by the bfd's EI_CLASS. */
985 unsigned int (*elf_backend_eh_frame_address_size)
988 /* These functions tell elf-eh-frame whether to attempt to turn
989 absolute or lsda encodings into pc-relative ones. The default
990 definition enables these transformations. */
991 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
992 (bfd *, struct bfd_link_info *, asection *);
993 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
994 (bfd *, struct bfd_link_info *, asection *);
996 /* This function returns an encoding after computing the encoded
997 value (and storing it in ENCODED) for the given OFFSET into OSEC,
998 to be stored in at LOC_OFFSET into the LOC_SEC input section.
999 The default definition chooses a 32-bit PC-relative encoding. */
1000 bfd_byte (*elf_backend_encode_eh_address)
1001 (bfd *abfd, struct bfd_link_info *info,
1002 asection *osec, bfd_vma offset,
1003 asection *loc_sec, bfd_vma loc_offset,
1006 /* This function, if defined, may write out the given section.
1007 Returns TRUE if it did so and FALSE if the caller should. */
1008 bfd_boolean (*elf_backend_write_section)
1009 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1011 /* The level of IRIX compatibility we're striving for.
1012 MIPS ELF specific function. */
1013 irix_compat_t (*elf_backend_mips_irix_compat)
1016 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1017 (unsigned int, bfd_boolean);
1019 /* The swapping table to use when dealing with ECOFF information.
1020 Used for the MIPS ELF .mdebug section. */
1021 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1023 /* This function implements `bfd_elf_bfd_from_remote_memory';
1024 see elf.c, elfcode.h. */
1025 bfd *(*elf_backend_bfd_from_remote_memory)
1026 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1027 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1029 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1031 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1033 /* Is symbol defined in common section? */
1034 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1036 /* Return a common section index for section. */
1037 unsigned int (*common_section_index) (asection *);
1039 /* Return a common section for section. */
1040 asection *(*common_section) (asection *);
1042 /* Return TRUE if we can merge 2 definitions. */
1043 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1044 struct elf_link_hash_entry **,
1045 struct elf_link_hash_entry *,
1046 Elf_Internal_Sym *, asection **,
1047 bfd_vma *, unsigned int *,
1048 bfd_boolean *, bfd_boolean *,
1049 bfd_boolean *, bfd_boolean *,
1050 bfd_boolean *, bfd_boolean *,
1051 bfd_boolean *, bfd_boolean *,
1053 bfd_boolean *, bfd_boolean *,
1054 bfd_boolean *, bfd_boolean *,
1055 bfd *, asection **);
1057 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1058 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1060 /* Return TRUE if type is a function symbol type. */
1061 bfd_boolean (*is_function_type) (unsigned int type);
1063 /* Used to handle bad SHF_LINK_ORDER input. */
1064 bfd_error_handler_type link_order_error_handler;
1066 /* Name of the PLT relocation section. */
1067 const char *relplt_name;
1069 /* Alternate EM_xxxx machine codes for this backend. */
1070 int elf_machine_alt1;
1071 int elf_machine_alt2;
1073 const struct elf_size_info *s;
1075 /* An array of target specific special sections. */
1076 const struct bfd_elf_special_section *special_sections;
1078 /* The size in bytes of the header for the GOT. This includes the
1079 so-called reserved entries on some systems. */
1080 bfd_vma got_header_size;
1082 /* The vendor name to use for a processor-standard attributes section. */
1083 const char *obj_attrs_vendor;
1085 /* The section name to use for a processor-standard attributes section. */
1086 const char *obj_attrs_section;
1088 /* Return 1, 2 or 3 to indicate what type of arguments a
1089 processor-specific tag takes. */
1090 int (*obj_attrs_arg_type) (int);
1092 /* The section type to use for an attributes section. */
1093 unsigned int obj_attrs_section_type;
1095 /* This is TRUE if the linker should act like collect and gather
1096 global constructors and destructors by name. This is TRUE for
1097 MIPS ELF because the Irix 5 tools can not handle the .init
1099 unsigned collect : 1;
1101 /* This is TRUE if the linker should ignore changes to the type of a
1102 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1103 record undefined functions as STT_OBJECT although the definitions
1105 unsigned type_change_ok : 1;
1107 /* Whether the backend may use REL relocations. (Some backends use
1108 both REL and RELA relocations, and this flag is set for those
1110 unsigned may_use_rel_p : 1;
1112 /* Whether the backend may use RELA relocations. (Some backends use
1113 both REL and RELA relocations, and this flag is set for those
1115 unsigned may_use_rela_p : 1;
1117 /* Whether the default relocation type is RELA. If a backend with
1118 this flag set wants REL relocations for a particular section,
1119 it must note that explicitly. Similarly, if this flag is clear,
1120 and the backend wants RELA relocations for a particular
1122 unsigned default_use_rela_p : 1;
1124 /* Set if RELA relocations for a relocatable link can be handled by
1125 generic code. Backends that set this flag need do nothing in the
1126 backend relocate_section routine for relocatable linking. */
1127 unsigned rela_normal : 1;
1129 /* TRUE if addresses "naturally" sign extend. This is used when
1130 swapping in from Elf32 when BFD64. */
1131 unsigned sign_extend_vma : 1;
1133 unsigned want_got_plt : 1;
1134 unsigned plt_readonly : 1;
1135 unsigned want_plt_sym : 1;
1136 unsigned plt_not_loaded : 1;
1137 unsigned plt_alignment : 4;
1138 unsigned can_gc_sections : 1;
1139 unsigned can_refcount : 1;
1140 unsigned want_got_sym : 1;
1141 unsigned want_dynbss : 1;
1143 /* Targets which do not support physical addressing often require
1144 that the p_paddr field in the section header to be set to zero.
1145 This field indicates whether this behavior is required. */
1146 unsigned want_p_paddr_set_to_zero : 1;
1148 /* True if an object file lacking a .note.GNU-stack section
1149 should be assumed to be requesting exec stack. At least one
1150 other file in the link needs to have a .note.GNU-stack section
1151 for a PT_GNU_STACK segment to be created. */
1152 unsigned default_execstack : 1;
1155 /* Information stored for each BFD section in an ELF file. This
1156 structure is allocated by elf_new_section_hook. */
1158 struct bfd_elf_section_data
1160 /* The ELF header for this section. */
1161 Elf_Internal_Shdr this_hdr;
1163 /* The ELF header for the reloc section associated with this
1165 Elf_Internal_Shdr rel_hdr;
1167 /* If there is a second reloc section associated with this section,
1168 as can happen on Irix 6, this field points to the header. */
1169 Elf_Internal_Shdr *rel_hdr2;
1171 /* The number of relocations currently assigned to REL_HDR. */
1172 unsigned int rel_count;
1174 /* The number of relocations currently assigned to REL_HDR2. */
1175 unsigned int rel_count2;
1177 /* The ELF section number of this section. */
1180 /* The ELF section number of the reloc section indicated by
1181 REL_HDR if any. Only used for an output file. */
1184 /* The ELF section number of the reloc section indicated by
1185 REL_HDR2 if any. Only used for an output file. */
1188 /* Used by the backend linker when generating a shared library to
1189 record the dynamic symbol index for a section symbol
1190 corresponding to this section. A value of 0 means that there is
1191 no dynamic symbol for this section. */
1194 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1195 asection *linked_to;
1197 /* Used by the backend linker to store the symbol hash table entries
1198 associated with relocs against global symbols. */
1199 struct elf_link_hash_entry **rel_hashes;
1201 /* A pointer to the swapped relocs. If the section uses REL relocs,
1202 rather than RELA, all the r_addend fields will be zero. This
1203 pointer may be NULL. It is used by the backend linker. */
1204 Elf_Internal_Rela *relocs;
1206 /* A pointer to a linked list tracking dynamic relocs copied for
1210 /* A pointer to the bfd section used for dynamic relocs. */
1214 /* Group name, if this section is a member of a group. */
1217 /* Group signature sym, if this is the SHT_GROUP section. */
1218 struct bfd_symbol *id;
1221 /* For a member of a group, points to the SHT_GROUP section.
1222 NULL for the SHT_GROUP section itself and non-group sections. */
1223 asection *sec_group;
1225 /* A linked list of member sections in the group. Circular when used by
1226 the linker. For the SHT_GROUP section, points at first member. */
1227 asection *next_in_group;
1229 /* A pointer used for various section optimizations. */
1233 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1234 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1235 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1236 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1237 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1238 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1239 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1240 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1242 #define xvec_get_elf_backend_data(xvec) \
1243 ((struct elf_backend_data *) (xvec)->backend_data)
1245 #define get_elf_backend_data(abfd) \
1246 xvec_get_elf_backend_data ((abfd)->xvec)
1248 /* This struct is used to pass information to routines called via
1249 elf_link_hash_traverse which must return failure. */
1251 struct elf_info_failed
1254 struct bfd_link_info *info;
1255 struct bfd_elf_version_tree *verdefs;
1258 /* This structure is used to pass information to
1259 _bfd_elf_link_assign_sym_version. */
1261 struct elf_assign_sym_version_info
1265 /* General link information. */
1266 struct bfd_link_info *info;
1268 struct bfd_elf_version_tree *verdefs;
1269 /* Whether we had a failure. */
1273 /* This structure is used to pass information to
1274 _bfd_elf_link_find_version_dependencies. */
1276 struct elf_find_verdep_info
1280 /* General link information. */
1281 struct bfd_link_info *info;
1282 /* The number of dependencies. */
1284 /* Whether we had a failure. */
1288 /* The maximum number of known object attributes for any target. */
1289 #define NUM_KNOWN_OBJ_ATTRIBUTES 32
1291 /* The value of an object attribute. type & 1 indicates whether there
1292 is an integer value; type & 2 indicates whether there is a string
1295 typedef struct obj_attribute
1302 typedef struct obj_attribute_list
1304 struct obj_attribute_list *next;
1307 } obj_attribute_list;
1309 /* Object attributes may either be defined by the processor ABI, index
1310 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1311 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1312 #define OBJ_ATTR_PROC 0
1313 #define OBJ_ATTR_GNU 1
1314 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1315 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1317 /* The following object attribute tags are taken as generic, for all
1318 targets and for "gnu" where there is no target standard. */
1325 Tag_compatibility = 32
1328 /* Some private data is stashed away for future use using the tdata pointer
1329 in the bfd structure. */
1331 struct elf_obj_tdata
1333 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1334 Elf_Internal_Shdr **elf_sect_ptr;
1335 Elf_Internal_Phdr *phdr;
1336 struct elf_segment_map *segment_map;
1337 struct elf_strtab_hash *strtab_ptr;
1340 unsigned int num_elf_sections; /* elf_sect_ptr size */
1341 int num_section_syms;
1342 asymbol **section_syms; /* STT_SECTION symbols for each section */
1343 Elf_Internal_Shdr symtab_hdr;
1344 Elf_Internal_Shdr shstrtab_hdr;
1345 Elf_Internal_Shdr strtab_hdr;
1346 Elf_Internal_Shdr dynsymtab_hdr;
1347 Elf_Internal_Shdr dynstrtab_hdr;
1348 Elf_Internal_Shdr dynversym_hdr;
1349 Elf_Internal_Shdr dynverref_hdr;
1350 Elf_Internal_Shdr dynverdef_hdr;
1351 Elf_Internal_Shdr symtab_shndx_hdr;
1352 unsigned int symtab_section, shstrtab_section;
1353 unsigned int strtab_section, dynsymtab_section;
1354 unsigned int symtab_shndx_section;
1355 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1356 file_ptr next_file_pos;
1357 bfd_vma gp; /* The gp value */
1358 unsigned int gp_size; /* The gp size */
1360 /* Information grabbed from an elf core file. */
1367 /* A mapping from external symbols to entries in the linker hash
1368 table, used when linking. This is indexed by the symbol index
1369 minus the sh_info field of the symbol table header. */
1370 struct elf_link_hash_entry **sym_hashes;
1372 /* Track usage and final offsets of GOT entries for local symbols.
1373 This array is indexed by symbol index. Elements are used
1374 identically to "got" in struct elf_link_hash_entry. */
1377 bfd_signed_vma *refcounts;
1379 struct got_entry **ents;
1382 /* The linker ELF emulation code needs to let the backend ELF linker
1383 know what filename should be used for a dynamic object if the
1384 dynamic object is found using a search. The emulation code then
1385 sometimes needs to know what name was actually used. Until the
1386 file has been added to the linker symbol table, this field holds
1387 the name the linker wants. After it has been added, it holds the
1388 name actually used, which will be the DT_SONAME entry if there is
1390 const char *dt_name;
1392 /* Records the result of `get_program_header_size'. */
1393 bfd_size_type program_header_size;
1395 /* Used by find_nearest_line entry point. */
1398 /* Used by MIPS ELF find_nearest_line entry point. The structure
1399 could be included directly in this one, but there's no point to
1400 wasting the memory just for the infrequently called
1401 find_nearest_line. */
1402 struct mips_elf_find_line *find_line_info;
1404 /* A place to stash dwarf1 info for this bfd. */
1405 struct dwarf1_debug *dwarf1_find_line_info;
1407 /* A place to stash dwarf2 info for this bfd. */
1408 void *dwarf2_find_line_info;
1410 /* An array of stub sections indexed by symbol number, used by the
1411 MIPS ELF linker. FIXME: We should figure out some way to only
1412 include this field for a MIPS ELF target. */
1413 asection **local_stubs;
1414 asection **local_call_stubs;
1416 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1418 asection *eh_frame_hdr;
1420 Elf_Internal_Shdr **group_sect_ptr;
1423 /* Number of symbol version definitions we are about to emit. */
1424 unsigned int cverdefs;
1426 /* Number of symbol version references we are about to emit. */
1427 unsigned int cverrefs;
1429 /* Segment flags for the PT_GNU_STACK segment. */
1430 unsigned int stack_flags;
1432 /* Should the PT_GNU_RELRO segment be emitted? */
1435 /* Symbol version definitions in external objects. */
1436 Elf_Internal_Verdef *verdef;
1438 /* Symbol version references to external objects. */
1439 Elf_Internal_Verneed *verref;
1441 /* The Irix 5 support uses two virtual sections, which represent
1442 text/data symbols defined in dynamic objects. */
1443 asymbol *elf_data_symbol;
1444 asymbol *elf_text_symbol;
1445 asection *elf_data_section;
1446 asection *elf_text_section;
1448 /* Whether a dyanmic object was specified normally on the linker
1449 command line, or was specified when --as-needed was in effect,
1450 or was found via a DT_NEEDED entry. */
1451 enum dynamic_lib_link_class dyn_lib_class;
1453 /* This is set to TRUE if the object was created by the backend
1457 /* Irix 5 often screws up the symbol table, sorting local symbols
1458 after global symbols. This flag is set if the symbol table in
1459 this BFD appears to be screwed up. If it is, we ignore the
1460 sh_info field in the symbol table header, and always read all the
1462 bfd_boolean bad_symtab;
1464 /* Used to determine if the e_flags field has been initialized */
1465 bfd_boolean flags_init;
1467 /* Symbol buffer. */
1470 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1471 obj_attribute_list *other_obj_attributes[2];
1474 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1475 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1476 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1477 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1478 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1479 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1480 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1481 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1482 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1483 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1484 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1485 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1486 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1487 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1488 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1489 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1490 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1491 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1492 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1493 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1494 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1495 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1496 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1497 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1498 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1499 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1500 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1501 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1502 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1503 #define elf_known_obj_attributes_proc(bfd) \
1504 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1505 #define elf_other_obj_attributes_proc(bfd) \
1506 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1508 extern void _bfd_elf_swap_verdef_in
1509 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1510 extern void _bfd_elf_swap_verdef_out
1511 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1512 extern void _bfd_elf_swap_verdaux_in
1513 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1514 extern void _bfd_elf_swap_verdaux_out
1515 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1516 extern void _bfd_elf_swap_verneed_in
1517 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1518 extern void _bfd_elf_swap_verneed_out
1519 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1520 extern void _bfd_elf_swap_vernaux_in
1521 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1522 extern void _bfd_elf_swap_vernaux_out
1523 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1524 extern void _bfd_elf_swap_versym_in
1525 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1526 extern void _bfd_elf_swap_versym_out
1527 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1529 extern int _bfd_elf_section_from_bfd_section
1530 (bfd *, asection *);
1531 extern char *bfd_elf_string_from_elf_section
1532 (bfd *, unsigned, unsigned);
1533 extern char *bfd_elf_get_str_section
1535 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1536 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1537 Elf_External_Sym_Shndx *);
1538 extern const char *bfd_elf_sym_name
1539 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1541 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1543 extern bfd_boolean _bfd_elf_print_private_bfd_data
1545 extern void bfd_elf_print_symbol
1546 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1548 extern void _bfd_elf_sprintf_vma
1549 (bfd *, char *, bfd_vma);
1550 extern void _bfd_elf_fprintf_vma
1551 (bfd *, void *, bfd_vma);
1553 extern unsigned int _bfd_elf_eh_frame_address_size
1554 (bfd *, asection *);
1555 extern bfd_byte _bfd_elf_encode_eh_address
1556 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1557 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1558 extern bfd_boolean _bfd_elf_can_make_relative
1559 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1561 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1562 (const Elf_Internal_Rela *);
1563 extern bfd_vma _bfd_elf_rela_local_sym
1564 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1565 extern bfd_vma _bfd_elf_rel_local_sym
1566 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1567 extern bfd_vma _bfd_elf_section_offset
1568 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1570 extern unsigned long bfd_elf_hash
1572 extern unsigned long bfd_elf_gnu_hash
1575 extern bfd_reloc_status_type bfd_elf_generic_reloc
1576 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1577 extern bfd_boolean bfd_elf_mkobject
1579 extern bfd_boolean bfd_elf_mkcorefile
1581 extern Elf_Internal_Shdr *bfd_elf_find_section
1583 extern bfd_boolean _bfd_elf_make_section_from_shdr
1584 (bfd *, Elf_Internal_Shdr *, const char *, int);
1585 extern bfd_boolean _bfd_elf_make_section_from_phdr
1586 (bfd *, Elf_Internal_Phdr *, int, const char *);
1587 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1588 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1589 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1591 extern void _bfd_elf_link_hash_copy_indirect
1592 (struct bfd_link_info *, struct elf_link_hash_entry *,
1593 struct elf_link_hash_entry *);
1594 extern void _bfd_elf_link_hash_hide_symbol
1595 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1596 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1597 (struct bfd_link_info *, struct elf_link_hash_entry *);
1598 extern bfd_boolean _bfd_elf_link_hash_table_init
1599 (struct elf_link_hash_table *, bfd *,
1600 struct bfd_hash_entry *(*)
1601 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1603 extern bfd_boolean _bfd_elf_slurp_version_tables
1604 (bfd *, bfd_boolean);
1605 extern bfd_boolean _bfd_elf_merge_sections
1606 (bfd *, struct bfd_link_info *);
1607 extern bfd_boolean _bfd_elf_match_sections_by_type
1608 (bfd *, const asection *, bfd *, const asection *);
1609 extern bfd_boolean bfd_elf_is_group_section
1610 (bfd *, const struct bfd_section *);
1611 extern void _bfd_elf_section_already_linked
1612 (bfd *, struct bfd_section *, struct bfd_link_info *);
1613 extern void bfd_elf_set_group_contents
1614 (bfd *, asection *, void *);
1615 extern asection *_bfd_elf_check_kept_section
1616 (asection *, struct bfd_link_info *);
1617 extern void _bfd_elf_link_just_syms
1618 (asection *, struct bfd_link_info *);
1619 extern bfd_boolean _bfd_elf_copy_private_header_data
1621 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1622 (bfd *, asymbol *, bfd *, asymbol *);
1623 #define _bfd_generic_init_private_section_data \
1624 _bfd_elf_init_private_section_data
1625 extern bfd_boolean _bfd_elf_init_private_section_data
1626 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1627 extern bfd_boolean _bfd_elf_copy_private_section_data
1628 (bfd *, asection *, bfd *, asection *);
1629 extern bfd_boolean _bfd_elf_write_object_contents
1631 extern bfd_boolean _bfd_elf_write_corefile_contents
1633 extern bfd_boolean _bfd_elf_set_section_contents
1634 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1635 extern long _bfd_elf_get_symtab_upper_bound
1637 extern long _bfd_elf_canonicalize_symtab
1638 (bfd *, asymbol **);
1639 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1641 extern long _bfd_elf_canonicalize_dynamic_symtab
1642 (bfd *, asymbol **);
1643 extern long _bfd_elf_get_synthetic_symtab
1644 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1645 extern long _bfd_elf_get_reloc_upper_bound
1647 extern long _bfd_elf_canonicalize_reloc
1648 (bfd *, sec_ptr, arelent **, asymbol **);
1649 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1651 extern long _bfd_elf_canonicalize_dynamic_reloc
1652 (bfd *, arelent **, asymbol **);
1653 extern asymbol *_bfd_elf_make_empty_symbol
1655 extern void _bfd_elf_get_symbol_info
1656 (bfd *, asymbol *, symbol_info *);
1657 extern bfd_boolean _bfd_elf_is_local_label_name
1658 (bfd *, const char *);
1659 extern alent *_bfd_elf_get_lineno
1661 extern bfd_boolean _bfd_elf_set_arch_mach
1662 (bfd *, enum bfd_architecture, unsigned long);
1663 extern bfd_boolean _bfd_elf_find_nearest_line
1664 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1666 extern bfd_boolean _bfd_elf_find_line
1667 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1668 #define _bfd_generic_find_line _bfd_elf_find_line
1669 extern bfd_boolean _bfd_elf_find_inliner_info
1670 (bfd *, const char **, const char **, unsigned int *);
1671 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1672 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1673 extern int _bfd_elf_sizeof_headers
1674 (bfd *, struct bfd_link_info *);
1675 extern bfd_boolean _bfd_elf_new_section_hook
1676 (bfd *, asection *);
1677 extern bfd_boolean _bfd_elf_init_reloc_shdr
1678 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1679 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1680 (const char *, const struct bfd_elf_special_section *, unsigned int);
1681 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1682 (bfd *, asection *);
1684 /* If the target doesn't have reloc handling written yet: */
1685 extern void _bfd_elf_no_info_to_howto
1686 (bfd *, arelent *, Elf_Internal_Rela *);
1688 extern bfd_boolean bfd_section_from_shdr
1689 (bfd *, unsigned int shindex);
1690 extern bfd_boolean bfd_section_from_phdr
1691 (bfd *, Elf_Internal_Phdr *, int);
1693 extern int _bfd_elf_symbol_from_bfd_symbol
1694 (bfd *, asymbol **);
1696 extern asection *bfd_section_from_r_symndx
1697 (bfd *, struct sym_sec_cache *, asection *, unsigned long);
1698 extern asection *bfd_section_from_elf_index
1699 (bfd *, unsigned int);
1700 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1703 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1705 extern void _bfd_elf_strtab_free
1706 (struct elf_strtab_hash *);
1707 extern bfd_size_type _bfd_elf_strtab_add
1708 (struct elf_strtab_hash *, const char *, bfd_boolean);
1709 extern void _bfd_elf_strtab_addref
1710 (struct elf_strtab_hash *, bfd_size_type);
1711 extern void _bfd_elf_strtab_delref
1712 (struct elf_strtab_hash *, bfd_size_type);
1713 extern void _bfd_elf_strtab_clear_all_refs
1714 (struct elf_strtab_hash *);
1715 extern bfd_size_type _bfd_elf_strtab_size
1716 (struct elf_strtab_hash *);
1717 extern bfd_size_type _bfd_elf_strtab_offset
1718 (struct elf_strtab_hash *, bfd_size_type);
1719 extern bfd_boolean _bfd_elf_strtab_emit
1720 (bfd *, struct elf_strtab_hash *);
1721 extern void _bfd_elf_strtab_finalize
1722 (struct elf_strtab_hash *);
1724 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1725 (bfd *, struct bfd_link_info *, asection *,
1726 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1727 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1728 (bfd *, struct bfd_link_info *);
1729 extern bfd_vma _bfd_elf_eh_frame_section_offset
1730 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1731 extern bfd_boolean _bfd_elf_write_section_eh_frame
1732 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1733 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1734 (bfd *, struct bfd_link_info *);
1735 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1736 (struct bfd_link_info *);
1738 extern bfd_boolean _bfd_elf_merge_symbol
1739 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1740 asection **, bfd_vma *, unsigned int *,
1741 struct elf_link_hash_entry **, bfd_boolean *,
1742 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1744 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1746 extern bfd_boolean _bfd_elf_add_default_symbol
1747 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
1748 const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
1749 bfd_boolean *, bfd_boolean);
1751 extern bfd_boolean _bfd_elf_export_symbol
1752 (struct elf_link_hash_entry *, void *);
1754 extern bfd_boolean _bfd_elf_link_find_version_dependencies
1755 (struct elf_link_hash_entry *, void *);
1757 extern bfd_boolean _bfd_elf_link_assign_sym_version
1758 (struct elf_link_hash_entry *, void *);
1760 extern long _bfd_elf_link_lookup_local_dynindx
1761 (struct bfd_link_info *, bfd *, long);
1762 extern bfd_boolean _bfd_elf_compute_section_file_positions
1763 (bfd *, struct bfd_link_info *);
1764 extern void _bfd_elf_assign_file_positions_for_relocs
1766 extern file_ptr _bfd_elf_assign_file_position_for_section
1767 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1769 extern bfd_boolean _bfd_elf_validate_reloc
1772 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1773 (bfd *, struct bfd_link_info *);
1774 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1775 (bfd *, struct bfd_link_info *, asection *);
1776 extern bfd_boolean _bfd_elf_create_dynamic_sections
1777 (bfd *, struct bfd_link_info *);
1778 extern bfd_boolean _bfd_elf_create_got_section
1779 (bfd *, struct bfd_link_info *);
1780 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1781 (bfd *, struct bfd_link_info *, asection *, const char *);
1782 extern void _bfd_elf_init_1_index_section
1783 (bfd *, struct bfd_link_info *);
1784 extern void _bfd_elf_init_2_index_sections
1785 (bfd *, struct bfd_link_info *);
1787 extern bfd_boolean _bfd_elfcore_make_pseudosection
1788 (bfd *, char *, size_t, ufile_ptr);
1789 extern char *_bfd_elfcore_strndup
1790 (bfd *, char *, size_t);
1792 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1793 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1795 extern bfd_boolean _bfd_elf_link_size_reloc_section
1796 (bfd *, Elf_Internal_Shdr *, asection *);
1798 extern bfd_boolean _bfd_elf_link_output_relocs
1799 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1800 struct elf_link_hash_entry **);
1802 extern bfd_boolean _bfd_elf_fix_symbol_flags
1803 (struct elf_link_hash_entry *, struct elf_info_failed *);
1805 extern bfd_boolean _bfd_elf_adjust_dynamic_symbol
1806 (struct elf_link_hash_entry *, void *);
1808 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1809 (struct elf_link_hash_entry *, asection *);
1811 extern bfd_boolean _bfd_elf_link_sec_merge_syms
1812 (struct elf_link_hash_entry *, void *);
1814 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1815 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1817 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1818 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1820 extern bfd_boolean bfd_elf_match_symbols_in_sections
1821 (asection *, asection *, struct bfd_link_info *);
1823 extern void bfd_elf_perform_complex_relocation
1824 (bfd * output_bfd ATTRIBUTE_UNUSED,
1825 struct bfd_link_info * info,
1827 asection * input_section,
1828 bfd_byte * contents,
1829 Elf_Internal_Rela * rel,
1830 Elf_Internal_Sym * local_syms,
1831 asection ** local_sections);
1833 extern bfd_boolean _bfd_elf_setup_sections
1836 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
1838 extern const bfd_target *bfd_elf32_object_p
1840 extern const bfd_target *bfd_elf32_core_file_p
1842 extern char *bfd_elf32_core_file_failing_command
1844 extern int bfd_elf32_core_file_failing_signal
1846 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1849 extern bfd_boolean bfd_elf32_swap_symbol_in
1850 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1851 extern void bfd_elf32_swap_symbol_out
1852 (bfd *, const Elf_Internal_Sym *, void *, void *);
1853 extern void bfd_elf32_swap_reloc_in
1854 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1855 extern void bfd_elf32_swap_reloc_out
1856 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1857 extern void bfd_elf32_swap_reloca_in
1858 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1859 extern void bfd_elf32_swap_reloca_out
1860 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1861 extern void bfd_elf32_swap_phdr_in
1862 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
1863 extern void bfd_elf32_swap_phdr_out
1864 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
1865 extern void bfd_elf32_swap_dyn_in
1866 (bfd *, const void *, Elf_Internal_Dyn *);
1867 extern void bfd_elf32_swap_dyn_out
1868 (bfd *, const Elf_Internal_Dyn *, void *);
1869 extern long bfd_elf32_slurp_symbol_table
1870 (bfd *, asymbol **, bfd_boolean);
1871 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
1873 extern int bfd_elf32_write_out_phdrs
1874 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1875 extern void bfd_elf32_write_relocs
1876 (bfd *, asection *, void *);
1877 extern bfd_boolean bfd_elf32_slurp_reloc_table
1878 (bfd *, asection *, asymbol **, bfd_boolean);
1880 extern const bfd_target *bfd_elf64_object_p
1882 extern const bfd_target *bfd_elf64_core_file_p
1884 extern char *bfd_elf64_core_file_failing_command
1886 extern int bfd_elf64_core_file_failing_signal
1888 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
1891 extern bfd_boolean bfd_elf64_swap_symbol_in
1892 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1893 extern void bfd_elf64_swap_symbol_out
1894 (bfd *, const Elf_Internal_Sym *, void *, void *);
1895 extern void bfd_elf64_swap_reloc_in
1896 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1897 extern void bfd_elf64_swap_reloc_out
1898 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1899 extern void bfd_elf64_swap_reloca_in
1900 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1901 extern void bfd_elf64_swap_reloca_out
1902 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1903 extern void bfd_elf64_swap_phdr_in
1904 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
1905 extern void bfd_elf64_swap_phdr_out
1906 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
1907 extern void bfd_elf64_swap_dyn_in
1908 (bfd *, const void *, Elf_Internal_Dyn *);
1909 extern void bfd_elf64_swap_dyn_out
1910 (bfd *, const Elf_Internal_Dyn *, void *);
1911 extern long bfd_elf64_slurp_symbol_table
1912 (bfd *, asymbol **, bfd_boolean);
1913 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
1915 extern int bfd_elf64_write_out_phdrs
1916 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1917 extern void bfd_elf64_write_relocs
1918 (bfd *, asection *, void *);
1919 extern bfd_boolean bfd_elf64_slurp_reloc_table
1920 (bfd *, asection *, asymbol **, bfd_boolean);
1922 extern bfd_boolean _bfd_elf_default_relocs_compatible
1923 (const bfd_target *, const bfd_target *);
1925 extern bfd_boolean _bfd_elf_relocs_compatible
1926 (const bfd_target *, const bfd_target *);
1928 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
1929 (bfd *, struct bfd_link_info *, const char *);
1930 extern bfd_boolean bfd_elf_link_add_symbols
1931 (bfd *, struct bfd_link_info *);
1932 extern bfd_boolean _bfd_elf_add_dynamic_entry
1933 (struct bfd_link_info *, bfd_vma, bfd_vma);
1935 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
1936 (struct bfd_link_info *, struct elf_link_hash_entry *);
1938 extern int bfd_elf_link_record_local_dynamic_symbol
1939 (struct bfd_link_info *, bfd *, long);
1941 extern void bfd_elf_link_mark_dynamic_symbol
1942 (struct bfd_link_info *, struct elf_link_hash_entry *,
1943 Elf_Internal_Sym *);
1945 extern bfd_boolean _bfd_elf_close_and_cleanup
1948 extern bfd_boolean _bfd_elf_common_definition
1949 (Elf_Internal_Sym *);
1951 extern unsigned int _bfd_elf_common_section_index
1954 extern asection *_bfd_elf_common_section
1957 extern void _bfd_dwarf2_cleanup_debug_info
1960 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
1961 (bfd *, arelent *, struct bfd_symbol *, void *,
1962 asection *, bfd *, char **);
1964 extern bfd_boolean bfd_elf_final_link
1965 (bfd *, struct bfd_link_info *);
1967 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
1968 (struct elf_link_hash_entry *h, void *inf);
1970 extern bfd_boolean bfd_elf_gc_sections
1971 (bfd *, struct bfd_link_info *);
1973 extern bfd_boolean bfd_elf_gc_record_vtinherit
1974 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
1976 extern bfd_boolean bfd_elf_gc_record_vtentry
1977 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
1979 extern asection *_bfd_elf_gc_mark_hook
1980 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
1981 struct elf_link_hash_entry *, Elf_Internal_Sym *);
1983 extern bfd_boolean _bfd_elf_gc_mark
1984 (struct bfd_link_info *, asection *,
1985 asection * (*) (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
1986 struct elf_link_hash_entry *, Elf_Internal_Sym *));
1988 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
1989 (bfd *, struct bfd_link_info *);
1991 extern bfd_boolean bfd_elf_gc_common_final_link
1992 (bfd *, struct bfd_link_info *);
1994 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
1997 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
1998 (bfd *, asection *);
2000 extern bfd_boolean _bfd_elf_map_sections_to_segments
2001 (bfd *, struct bfd_link_info *);
2003 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2005 /* Exported interface for writing elf corefile notes. */
2006 extern char *elfcore_write_note
2007 (bfd *, char *, int *, const char *, int, const void *, int);
2008 extern char *elfcore_write_prpsinfo
2009 (bfd *, char *, int *, const char *, const char *);
2010 extern char *elfcore_write_prstatus
2011 (bfd *, char *, int *, long, int, const void *);
2012 extern char * elfcore_write_pstatus
2013 (bfd *, char *, int *, long, int, const void *);
2014 extern char *elfcore_write_prfpreg
2015 (bfd *, char *, int *, const void *, int);
2016 extern char *elfcore_write_thrmisc
2017 (bfd *, char *, int *, const char *, int);
2018 extern char *elfcore_write_prxfpreg
2019 (bfd *, char *, int *, const void *, int);
2020 extern char *elfcore_write_lwpstatus
2021 (bfd *, char *, int *, long, int, const void *);
2023 extern bfd *_bfd_elf32_bfd_from_remote_memory
2024 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2025 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2026 extern bfd *_bfd_elf64_bfd_from_remote_memory
2027 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2028 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2030 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2031 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2032 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2033 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2034 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2035 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2036 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2037 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2038 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2039 extern void bfd_elf_add_obj_attr_compat (bfd *, int, unsigned int,
2041 #define bfd_elf_add_proc_attr_compat(BFD, INTVAL, STRVAL) \
2042 bfd_elf_add_obj_attr_compat ((BFD), OBJ_ATTR_PROC, (INTVAL), (STRVAL))
2044 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2045 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2046 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2047 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2048 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2050 /* Large common section. */
2051 extern asection _bfd_elf_large_com_section;
2053 /* SH ELF specific routine. */
2055 extern bfd_boolean _sh_elf_set_mach_from_flags
2058 /* This is the condition under which finish_dynamic_symbol will be called.
2059 If our finish_dynamic_symbol isn't called, we'll need to do something
2060 about initializing any .plt and .got entries in relocate_section. */
2061 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2063 && ((SHARED) || !(H)->forced_local) \
2064 && ((H)->dynindx != -1 || (H)->forced_local))
2066 /* This macro is to avoid lots of duplicated code in the body
2067 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2068 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2069 r_symndx, symtab_hdr, sym_hashes, \
2070 h, sec, relocation, \
2071 unresolved_reloc, warned) \
2074 /* It seems this can happen with erroneous or unsupported \
2075 input (mixing a.out and elf in an archive, for example.) */ \
2076 if (sym_hashes == NULL) \
2079 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2081 while (h->root.type == bfd_link_hash_indirect \
2082 || h->root.type == bfd_link_hash_warning) \
2083 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2086 unresolved_reloc = FALSE; \
2088 if (h->root.type == bfd_link_hash_defined \
2089 || h->root.type == bfd_link_hash_defweak) \
2091 sec = h->root.u.def.section; \
2093 || sec->output_section == NULL) \
2094 /* Set a flag that will be cleared later if we find a \
2095 relocation value for this symbol. output_section \
2096 is typically NULL for symbols satisfied by a shared \
2098 unresolved_reloc = TRUE; \
2100 relocation = (h->root.u.def.value \
2101 + sec->output_section->vma \
2102 + sec->output_offset); \
2104 else if (h->root.type == bfd_link_hash_undefweak) \
2106 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2107 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2109 else if (!info->relocatable) \
2112 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2113 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2114 if (!info->callbacks->undefined_symbol (info, \
2115 h->root.root.string, \
2118 rel->r_offset, err)) \
2125 /* Will a symbol be bound to the the definition within the shared
2127 #define SYMBOLIC_BIND(INFO, H) \
2128 ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))
2130 #endif /* _LIBELF_H_ */