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 3 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,
21 MA 02110-1301, USA. */
26 #include "elf/common.h"
27 #include "elf/internal.h"
28 #include "elf/external.h"
31 /* The number of entries in a section is its size divided by the size
32 of a single entry. This is normally only applicable to reloc and
33 symbol table sections. */
34 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_size / (shdr)->sh_entsize)
36 /* If size isn't specified as 64 or 32, NAME macro should fail. */
39 #define NAME(x, y) x ## 64 ## _ ## y
42 #define NAME(x, y) x ## 32 ## _ ## y
47 #define NAME(x, y) x ## NOSIZE ## _ ## y
50 #define ElfNAME(X) NAME(Elf,X)
51 #define elfNAME(X) NAME(elf,X)
53 /* Information held for an ELF symbol. The first field is the
54 corresponding asymbol. Every symbol is an ELF file is actually a
55 pointer to this structure, although it is often handled as a
56 pointer to an asymbol. */
62 /* ELF symbol information. */
63 Elf_Internal_Sym internal_elf_sym;
64 /* Backend specific information. */
67 unsigned int hppa_arg_reloc;
73 /* Version information. This is from an Elf_Internal_Versym
74 structure in a SHT_GNU_versym section. It is zero if there is no
75 version information. */
76 unsigned short version;
80 struct elf_strtab_hash;
84 /* ELF linker hash table entries. */
86 struct elf_link_hash_entry
88 struct bfd_link_hash_entry root;
90 /* Symbol index in output file. This is initialized to -1. It is
91 set to -2 if the symbol is used by a reloc. */
94 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
95 -1 if this is not a dynamic symbol. */
96 /* ??? Note that this is consistently used as a synonym for tests
97 against whether we can perform various simplifying transformations
98 to the code. (E.g. changing a pc-relative jump to a PLT entry
99 into a pc-relative jump to the target function.) That test, which
100 is often relatively complex, and someplaces wrong or incomplete,
101 should really be replaced by a predicate in elflink.c.
103 End result: this field -1 does not indicate that the symbol is
104 not in the dynamic symbol table, but rather that the symbol is
105 not visible outside this DSO. */
108 /* If this symbol requires an entry in the global offset table, the
109 processor specific backend uses this field to track usage and
110 final offset. Two schemes are supported: The first assumes that
111 a symbol may only have one GOT entry, and uses REFCOUNT until
112 size_dynamic_sections, at which point the contents of the .got is
113 fixed. Afterward, if OFFSET is -1, then the symbol does not
114 require a global offset table entry. The second scheme allows
115 multiple GOT entries per symbol, managed via a linked list
116 pointed to by GLIST. */
119 bfd_signed_vma refcount;
121 struct got_entry *glist;
122 struct plt_entry *plist;
125 /* Same, but tracks a procedure linkage table entry. */
126 union gotplt_union plt;
131 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
132 unsigned int type : 8;
134 /* Symbol st_other value, symbol visibility. */
135 unsigned int other : 8;
137 /* Symbol is referenced by a non-shared object. */
138 unsigned int ref_regular : 1;
139 /* Symbol is defined by a non-shared object. */
140 unsigned int def_regular : 1;
141 /* Symbol is referenced by a shared object. */
142 unsigned int ref_dynamic : 1;
143 /* Symbol is defined by a shared object. */
144 unsigned int def_dynamic : 1;
145 /* Symbol has a non-weak reference from a non-shared object. */
146 unsigned int ref_regular_nonweak : 1;
147 /* Dynamic symbol has been adjustd. */
148 unsigned int dynamic_adjusted : 1;
149 /* Symbol needs a copy reloc. */
150 unsigned int needs_copy : 1;
151 /* Symbol needs a procedure linkage table entry. */
152 unsigned int needs_plt : 1;
153 /* Symbol appears in a non-ELF input file. */
154 unsigned int non_elf : 1;
155 /* Symbol should be marked as hidden in the version information. */
156 unsigned int hidden : 1;
157 /* Symbol was forced to local scope due to a version script file. */
158 unsigned int forced_local : 1;
159 /* Symbol was forced to be dynamic due to a version script file. */
160 unsigned int dynamic : 1;
161 /* Symbol was marked during garbage collection. */
162 unsigned int mark : 1;
163 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
164 not currently set by all the backends. */
165 unsigned int non_got_ref : 1;
166 /* Symbol has a definition in a shared object.
167 FIXME: There is no real need for this field if def_dynamic is never
168 cleared and all places that test def_dynamic also test def_regular. */
169 unsigned int dynamic_def : 1;
170 /* Symbol is weak in all shared objects. */
171 unsigned int dynamic_weak : 1;
172 /* Symbol is referenced with a relocation where C/C++ pointer equality
174 unsigned int pointer_equality_needed : 1;
176 /* String table index in .dynstr if this is a dynamic symbol. */
177 unsigned long dynstr_index;
181 /* If this is a weak defined symbol from a dynamic object, this
182 field points to a defined symbol with the same value, if there is
183 one. Otherwise it is NULL. */
184 struct elf_link_hash_entry *weakdef;
186 /* Hash value of the name computed using the ELF hash function.
187 Used part way through size_dynamic_sections, after we've finished
189 unsigned long elf_hash_value;
192 /* Version information. */
195 /* This field is used for a symbol which is not defined in a
196 regular object. It points to the version information read in
197 from the dynamic object. */
198 Elf_Internal_Verdef *verdef;
199 /* This field is used for a symbol which is defined in a regular
200 object. It is set up in size_dynamic_sections. It points to
201 the version information we should write out for this symbol. */
202 struct bfd_elf_version_tree *vertree;
207 /* Virtual table entry use information. This array is nominally of size
208 size/sizeof(target_void_pointer), though we have to be able to assume
209 and track a size while the symbol is still undefined. It is indexed
210 via offset/sizeof(target_void_pointer). */
214 /* Virtual table derivation info. */
215 struct elf_link_hash_entry *parent;
219 /* Will references to this symbol always reference the symbol
220 in this object? STV_PROTECTED is excluded from the visibility test
221 here so that function pointer comparisons work properly. Since
222 function symbols not defined in an app are set to their .plt entry,
223 it's necessary for shared libs to also reference the .plt even
224 though the symbol is really local to the shared lib. */
225 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
226 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
228 /* Will _calls_ to this symbol always call the version in this object? */
229 #define SYMBOL_CALLS_LOCAL(INFO, H) \
230 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
232 /* Common symbols that are turned into definitions don't have the
233 DEF_REGULAR flag set, so they might appear to be undefined. */
234 #define ELF_COMMON_DEF_P(H) \
236 && !(H)->def_dynamic \
237 && (H)->root.type == bfd_link_hash_defined)
239 /* Records local symbols to be emitted in the dynamic symbol table. */
241 struct elf_link_local_dynamic_entry
243 struct elf_link_local_dynamic_entry *next;
245 /* The input bfd this symbol came from. */
248 /* The index of the local symbol being copied. */
251 /* The index in the outgoing dynamic symbol table. */
254 /* A copy of the input symbol. */
255 Elf_Internal_Sym isym;
258 struct elf_link_loaded_list
260 struct elf_link_loaded_list *next;
264 /* Structures used by the eh_frame optimization code. */
269 /* If REMOVED == 1, this is the CIE that the FDE originally used.
270 The CIE belongs to the same .eh_frame input section as the FDE.
272 If REMOVED == 0, this is the CIE that we have chosen to use for
273 the output FDE. The CIE's REMOVED field is also 0, but the CIE
274 might belong to a different .eh_frame input section from the FDE. */
275 struct eh_cie_fde *cie_inf;
276 struct eh_cie_fde *next_for_section;
279 /* In general, equivalent CIEs are grouped together, with one CIE
280 representing all the others in a group. If REMOVED == 0,
281 this CIE is the group representative. If REMOVED == 1,
282 following this pointer brings us "closer" to the CIE's group
283 representative, and reapplying always gives the representative. */
284 struct eh_cie_fde *merged;
286 /* True if we have marked relocations associated with this CIE. */
287 unsigned int gc_mark : 1;
289 /* True if we have decided to turn an absolute LSDA encoding into
290 a PC-relative one. It is the group representative's setting
292 unsigned int make_lsda_relative : 1;
295 unsigned int reloc_index;
298 unsigned int new_offset;
299 unsigned int fde_encoding : 8;
300 unsigned int lsda_encoding : 8;
301 unsigned int lsda_offset : 8;
302 unsigned int cie : 1;
303 unsigned int removed : 1;
304 unsigned int add_augmentation_size : 1;
305 unsigned int add_fde_encoding : 1;
306 unsigned int make_relative : 1;
307 unsigned int per_encoding_relative : 1;
308 unsigned int *set_loc;
311 struct eh_frame_sec_info
314 struct eh_cie_fde entry[1];
317 struct eh_frame_array_ent
325 struct eh_frame_hdr_info
329 unsigned int fde_count, array_count;
330 struct eh_frame_array_ent *array;
331 /* TRUE if all .eh_frames have been parsd. */
332 bfd_boolean parsed_eh_frames;
333 /* TRUE if .eh_frame_hdr should contain the sorted search table.
334 We build it if we successfully read all .eh_frame input sections
335 and recognize them. */
337 bfd_boolean offsets_adjusted;
340 /* ELF linker hash table. */
342 struct elf_link_hash_table
344 struct bfd_link_hash_table root;
346 /* Whether we have created the special dynamic sections required
347 when linking against or generating a shared object. */
348 bfd_boolean dynamic_sections_created;
350 /* True if this target has relocatable executables, so needs dynamic
352 bfd_boolean is_relocatable_executable;
354 /* The BFD used to hold special sections created by the linker.
355 This will be the first BFD found which requires these sections to
359 /* The value to use when initialising got.refcount/offset and
360 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
361 the values are refcounts. Set to init_got_offset/init_plt_offset
362 in size_dynamic_sections when the values may be offsets. */
363 union gotplt_union init_got_refcount;
364 union gotplt_union init_plt_refcount;
366 /* The value to use for got.refcount/offset and plt.refcount/offset
367 when the values may be offsets. Normally (bfd_vma) -1. */
368 union gotplt_union init_got_offset;
369 union gotplt_union init_plt_offset;
371 /* The number of symbols found in the link which must be put into
372 the .dynsym section. */
373 bfd_size_type dynsymcount;
375 /* The string table of dynamic symbols, which becomes the .dynstr
377 struct elf_strtab_hash *dynstr;
379 /* The number of buckets in the hash table in the .hash section.
380 This is based on the number of dynamic symbols. */
381 bfd_size_type bucketcount;
383 /* A linked list of DT_NEEDED names found in dynamic objects
384 included in the link. */
385 struct bfd_link_needed_list *needed;
387 /* Sections in the output bfd that provides a section symbol
388 to be used by relocations emitted against local symbols.
389 Most targets will not use data_index_section. */
390 asection *text_index_section;
391 asection *data_index_section;
393 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
394 struct elf_link_hash_entry *hgot;
396 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
397 struct elf_link_hash_entry *hplt;
399 /* A pointer to information used to merge SEC_MERGE sections. */
402 /* Used to link stabs in sections. */
403 struct stab_info stab_info;
405 /* Used by eh_frame code when editing .eh_frame. */
406 struct eh_frame_hdr_info eh_info;
408 /* A linked list of local symbols to be added to .dynsym. */
409 struct elf_link_local_dynamic_entry *dynlocal;
411 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
412 objects included in the link. */
413 struct bfd_link_needed_list *runpath;
415 /* Cached first output tls section and size of PT_TLS segment. */
417 bfd_size_type tls_size;
419 /* A linked list of BFD's loaded in the link. */
420 struct elf_link_loaded_list *loaded;
423 /* Look up an entry in an ELF linker hash table. */
425 #define elf_link_hash_lookup(table, string, create, copy, follow) \
426 ((struct elf_link_hash_entry *) \
427 bfd_link_hash_lookup (&(table)->root, (string), (create), \
430 /* Traverse an ELF linker hash table. */
432 #define elf_link_hash_traverse(table, func, info) \
433 (bfd_link_hash_traverse \
435 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
438 /* Get the ELF linker hash table from a link_info structure. */
440 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
442 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
443 #define is_elf_hash_table(htab) \
444 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
446 /* Used by bfd_section_from_r_symndx to cache a small number of local
447 symbol to section mappings. */
448 #define LOCAL_SYM_CACHE_SIZE 32
452 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
453 unsigned int shndx[LOCAL_SYM_CACHE_SIZE];
456 /* Constant information held for an ELF backend. */
458 struct elf_size_info {
459 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
460 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
462 /* The size of entries in the .hash section. */
463 unsigned char sizeof_hash_entry;
465 /* The number of internal relocations to allocate per external
467 unsigned char int_rels_per_ext_rel;
468 /* We use some fixed size arrays. This should be large enough to
469 handle all back-ends. */
470 #define MAX_INT_RELS_PER_EXT_REL 3
472 unsigned char arch_size, log_file_align;
473 unsigned char elfclass, ev_current;
474 int (*write_out_phdrs)
475 (bfd *, const Elf_Internal_Phdr *, unsigned int);
477 (*write_shdrs_and_ehdr) (bfd *);
478 bfd_boolean (*checksum_contents)
479 (bfd * , void (*) (const void *, size_t, void *), void *);
481 (bfd *, asection *, void *);
482 bfd_boolean (*swap_symbol_in)
483 (bfd *, const void *, const void *, Elf_Internal_Sym *);
484 void (*swap_symbol_out)
485 (bfd *, const Elf_Internal_Sym *, void *, void *);
486 bfd_boolean (*slurp_reloc_table)
487 (bfd *, asection *, asymbol **, bfd_boolean);
488 long (*slurp_symbol_table)
489 (bfd *, asymbol **, bfd_boolean);
491 (bfd *, const void *, Elf_Internal_Dyn *);
493 (bfd *, const Elf_Internal_Dyn *, void *);
495 /* This function is called to swap in a REL relocation. If an
496 external relocation corresponds to more than one internal
497 relocation, then all relocations are swapped in at once. */
498 void (*swap_reloc_in)
499 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
501 /* This function is called to swap out a REL relocation. */
502 void (*swap_reloc_out)
503 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
505 /* This function is called to swap in a RELA relocation. If an
506 external relocation corresponds to more than one internal
507 relocation, then all relocations are swapped in at once. */
508 void (*swap_reloca_in)
509 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
511 /* This function is called to swap out a RELA relocation. */
512 void (*swap_reloca_out)
513 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
516 #define elf_symbol_from(ABFD,S) \
517 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
518 && (S)->the_bfd->tdata.elf_obj_data != 0) \
519 ? (elf_symbol_type *) (S) \
522 enum elf_reloc_type_class {
524 reloc_class_relative,
529 struct elf_reloc_cookie
531 Elf_Internal_Rela *rels, *rel, *relend;
532 Elf_Internal_Sym *locsyms;
536 struct elf_link_hash_entry **sym_hashes;
538 bfd_boolean bad_symtab;
541 /* The level of IRIX compatibility we're striving for. */
549 /* Mapping of ELF section names and types. */
550 struct bfd_elf_special_section
554 /* 0 means name must match PREFIX exactly.
555 -1 means name must start with PREFIX followed by an arbitrary string.
556 -2 means name must match PREFIX exactly or consist of PREFIX followed
557 by a dot then anything.
558 > 0 means name must start with the first PREFIX_LENGTH chars of
559 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
565 enum action_discarded
571 typedef asection * (*elf_gc_mark_hook_fn)
572 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
573 struct elf_link_hash_entry *, Elf_Internal_Sym *);
575 struct elf_backend_data
577 /* The architecture for this backend. */
578 enum bfd_architecture arch;
580 /* The ELF machine code (EM_xxxx) for this backend. */
581 int elf_machine_code;
586 /* The maximum page size for this backend. */
589 /* The minimum page size for this backend. An input object will not be
590 considered page aligned unless its sections are correctly aligned for
591 pages at least this large. May be smaller than maxpagesize. */
594 /* The common page size for this backend. */
595 bfd_vma commonpagesize;
597 /* The BFD flags applied to sections created for dynamic linking. */
598 flagword dynamic_sec_flags;
600 /* A function to translate an ELF RELA relocation to a BFD arelent
602 void (*elf_info_to_howto)
603 (bfd *, arelent *, Elf_Internal_Rela *);
605 /* A function to translate an ELF REL relocation to a BFD arelent
607 void (*elf_info_to_howto_rel)
608 (bfd *, arelent *, Elf_Internal_Rela *);
610 /* A function to determine whether a symbol is global when
611 partitioning the symbol table into local and global symbols.
612 This should be NULL for most targets, in which case the correct
613 thing will be done. MIPS ELF, at least on the Irix 5, has
614 special requirements. */
615 bfd_boolean (*elf_backend_sym_is_global)
618 /* The remaining functions are hooks which are called only if they
621 /* A function to permit a backend specific check on whether a
622 particular BFD format is relevant for an object file, and to
623 permit the backend to set any global information it wishes. When
624 this is called elf_elfheader is set, but anything else should be
625 used with caution. If this returns FALSE, the check_format
626 routine will return a bfd_error_wrong_format error. */
627 bfd_boolean (*elf_backend_object_p)
630 /* A function to do additional symbol processing when reading the
631 ELF symbol table. This is where any processor-specific special
632 section indices are handled. */
633 void (*elf_backend_symbol_processing)
636 /* A function to do additional symbol processing after reading the
637 entire ELF symbol table. */
638 bfd_boolean (*elf_backend_symbol_table_processing)
639 (bfd *, elf_symbol_type *, unsigned int);
641 /* A function to set the type of the info field. Processor-specific
642 types should be handled here. */
643 int (*elf_backend_get_symbol_type)
644 (Elf_Internal_Sym *, int);
646 /* A function to return the linker hash table entry of a symbol that
647 might be satisfied by an archive symbol. */
648 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
649 (bfd *, struct bfd_link_info *, const char *);
651 /* Return true if local section symbols should have a non-null st_name.
652 NULL implies false. */
653 bfd_boolean (*elf_backend_name_local_section_symbols)
656 /* A function to do additional processing on the ELF section header
657 just before writing it out. This is used to set the flags and
658 type fields for some sections, or to actually write out data for
660 bfd_boolean (*elf_backend_section_processing)
661 (bfd *, Elf_Internal_Shdr *);
663 /* A function to handle unusual section types when creating BFD
664 sections from ELF sections. */
665 bfd_boolean (*elf_backend_section_from_shdr)
666 (bfd *, Elf_Internal_Shdr *, const char *, int);
668 /* A function to convert machine dependent ELF section header flags to
669 BFD internal section header flags. */
670 bfd_boolean (*elf_backend_section_flags)
671 (flagword *, const Elf_Internal_Shdr *);
673 /* A function that returns a struct containing ELF section flags and
674 type for the given BFD section. */
675 const struct bfd_elf_special_section * (*get_sec_type_attr)
678 /* A function to handle unusual program segment types when creating BFD
679 sections from ELF program segments. */
680 bfd_boolean (*elf_backend_section_from_phdr)
681 (bfd *, Elf_Internal_Phdr *, int, const char *);
683 /* A function to set up the ELF section header for a BFD section in
684 preparation for writing it out. This is where the flags and type
685 fields are set for unusual sections. */
686 bfd_boolean (*elf_backend_fake_sections)
687 (bfd *, Elf_Internal_Shdr *, asection *);
689 /* A function to get the ELF section index for a BFD section. If
690 this returns TRUE, the section was found. If it is a normal ELF
691 section, *RETVAL should be left unchanged. If it is not a normal
692 ELF section *RETVAL should be set to the SHN_xxxx index. */
693 bfd_boolean (*elf_backend_section_from_bfd_section)
694 (bfd *, asection *, int *retval);
696 /* If this field is not NULL, it is called by the add_symbols phase
697 of a link just before adding a symbol to the global linker hash
698 table. It may modify any of the fields as it wishes. If *NAME
699 is set to NULL, the symbol will be skipped rather than being
700 added to the hash table. This function is responsible for
701 handling all processor dependent symbol bindings and section
702 indices, and must set at least *FLAGS and *SEC for each processor
703 dependent case; failure to do so will cause a link error. */
704 bfd_boolean (*elf_add_symbol_hook)
705 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
706 const char **name, flagword *flags, asection **sec, bfd_vma *value);
708 /* If this field is not NULL, it is called by the elf_link_output_sym
709 phase of a link for each symbol which will appear in the object file. */
710 bfd_boolean (*elf_backend_link_output_symbol_hook)
711 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
712 asection *, struct elf_link_hash_entry *);
714 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
715 linker the first time it encounters a dynamic object in the link.
716 This function must create any sections required for dynamic
717 linking. The ABFD argument is a dynamic object. The .interp,
718 .dynamic, .dynsym, .dynstr, and .hash functions have already been
719 created, and this function may modify the section flags if
720 desired. This function will normally create the .got and .plt
721 sections, but different backends have different requirements. */
722 bfd_boolean (*elf_backend_create_dynamic_sections)
723 (bfd *abfd, struct bfd_link_info *info);
725 /* When creating a shared library, determine whether to omit the
726 dynamic symbol for the section. */
727 bfd_boolean (*elf_backend_omit_section_dynsym)
728 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
730 /* Return TRUE if relocations of targets are compatible to the extent
731 that CHECK_RELOCS will properly process them. PR 4424. */
732 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
734 /* The CHECK_RELOCS function is called by the add_symbols phase of
735 the ELF backend linker. It is called once for each section with
736 relocs of an object file, just after the symbols for the object
737 file have been added to the global linker hash table. The
738 function must look through the relocs and do any special handling
739 required. This generally means allocating space in the global
740 offset table, and perhaps allocating space for a reloc. The
741 relocs are always passed as Rela structures; if the section
742 actually uses Rel structures, the r_addend field will always be
744 bfd_boolean (*check_relocs)
745 (bfd *abfd, struct bfd_link_info *info, asection *o,
746 const Elf_Internal_Rela *relocs);
748 /* The CHECK_DIRECTIVES function is called once per input file by
749 the add_symbols phase of the ELF backend linker. The function
750 must inspect the bfd and create any additional symbols according
751 to any custom directives in the bfd. */
752 bfd_boolean (*check_directives)
753 (bfd *abfd, struct bfd_link_info *info);
755 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
756 input file that was not needed by the add_symbols phase of the
757 ELF backend linker. The function must undo any target specific
758 changes in the symbol hash table. */
759 bfd_boolean (*as_needed_cleanup)
760 (bfd *abfd, struct bfd_link_info *info);
762 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
763 linker for every symbol which is defined by a dynamic object and
764 referenced by a regular object. This is called after all the
765 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
766 function has been called. The hash table entry should be
767 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
768 defined in a section from a dynamic object. Dynamic object
769 sections are not included in the final link, and this function is
770 responsible for changing the value to something which the rest of
771 the link can deal with. This will normally involve adding an
772 entry to the .plt or .got or some such section, and setting the
773 symbol to point to that. */
774 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
775 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
777 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
778 after all the linker input files have been seen but before the
779 section sizes have been set. This is called after
780 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
781 bfd_boolean (*elf_backend_always_size_sections)
782 (bfd *output_bfd, struct bfd_link_info *info);
784 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
785 linker after all the linker input files have been seen but before
786 the sections sizes have been set. This is called after
787 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
788 It is only called when linking against a dynamic object. It must
789 set the sizes of the dynamic sections, and may fill in their
790 contents as well. The generic ELF linker can handle the .dynsym,
791 .dynstr and .hash sections. This function must handle the
792 .interp section and any sections created by the
793 CREATE_DYNAMIC_SECTIONS entry point. */
794 bfd_boolean (*elf_backend_size_dynamic_sections)
795 (bfd *output_bfd, struct bfd_link_info *info);
797 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
798 we keep to use as a base for relocs and symbols. */
799 void (*elf_backend_init_index_section)
800 (bfd *output_bfd, struct bfd_link_info *info);
802 /* The RELOCATE_SECTION function is called by the ELF backend linker
803 to handle the relocations for a section.
805 The relocs are always passed as Rela structures; if the section
806 actually uses Rel structures, the r_addend field will always be
809 This function is responsible for adjust the section contents as
810 necessary, and (if using Rela relocs and generating a
811 relocatable output file) adjusting the reloc addend as
814 This function does not have to worry about setting the reloc
815 address or the reloc symbol index.
817 LOCAL_SYMS is a pointer to the swapped in local symbols.
819 LOCAL_SECTIONS is an array giving the section in the input file
820 corresponding to the st_shndx field of each local symbol.
822 The global hash table entry for the global symbols can be found
823 via elf_sym_hashes (input_bfd).
825 When generating relocatable output, this function must handle
826 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
827 going to be the section symbol corresponding to the output
828 section, which means that the addend must be adjusted
831 Returns FALSE on error, TRUE on success, 2 if successful and
832 relocations should be written for this section. */
833 int (*elf_backend_relocate_section)
834 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
835 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
836 Elf_Internal_Sym *local_syms, asection **local_sections);
838 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
839 linker just before it writes a symbol out to the .dynsym section.
840 The processor backend may make any required adjustment to the
841 symbol. It may also take the opportunity to set contents of the
842 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
843 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
844 on those symbols which are defined by a dynamic object. */
845 bfd_boolean (*elf_backend_finish_dynamic_symbol)
846 (bfd *output_bfd, struct bfd_link_info *info,
847 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
849 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
850 linker just before it writes all the dynamic sections out to the
851 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
852 all dynamic symbols. */
853 bfd_boolean (*elf_backend_finish_dynamic_sections)
854 (bfd *output_bfd, struct bfd_link_info *info);
856 /* A function to do any beginning processing needed for the ELF file
857 before building the ELF headers and computing file positions. */
858 void (*elf_backend_begin_write_processing)
859 (bfd *, struct bfd_link_info *);
861 /* A function to do any final processing needed for the ELF file
862 before writing it out. The LINKER argument is TRUE if this BFD
863 was created by the ELF backend linker. */
864 void (*elf_backend_final_write_processing)
865 (bfd *, bfd_boolean linker);
867 /* This function is called by get_program_header_size. It should
868 return the number of additional program segments which this BFD
869 will need. It should return -1 on error. */
870 int (*elf_backend_additional_program_headers)
871 (bfd *, struct bfd_link_info *);
873 /* This function is called to modify an existing segment map in a
874 backend specific fashion. */
875 bfd_boolean (*elf_backend_modify_segment_map)
876 (bfd *, struct bfd_link_info *);
878 /* This function is called to modify program headers just before
880 bfd_boolean (*elf_backend_modify_program_headers)
881 (bfd *, struct bfd_link_info *);
883 /* This function is called during section garbage collection to
884 mark sections that define global symbols. */
885 bfd_boolean (*gc_mark_dynamic_ref)
886 (struct elf_link_hash_entry *h, void *inf);
888 /* This function is called during section gc to discover the section a
889 particular relocation refers to. */
890 elf_gc_mark_hook_fn gc_mark_hook;
892 /* This function, if defined, is called after the first gc marking pass
893 to allow the backend to mark additional sections. */
894 bfd_boolean (*gc_mark_extra_sections)
895 (struct bfd_link_info *info, elf_gc_mark_hook_fn gc_mark_hook);
897 /* This function, if defined, is called during the sweep phase of gc
898 in order that a backend might update any data structures it might
900 bfd_boolean (*gc_sweep_hook)
901 (bfd *abfd, struct bfd_link_info *info, asection *o,
902 const Elf_Internal_Rela *relocs);
904 /* This function, if defined, is called after the ELF headers have
905 been created. This allows for things like the OS and ABI versions
907 void (*elf_backend_post_process_headers)
908 (bfd *, struct bfd_link_info *);
910 /* This function, if defined, prints a symbol to file and returns the
911 name of the symbol to be printed. It should return NULL to fall
912 back to default symbol printing. */
913 const char *(*elf_backend_print_symbol_all)
914 (bfd *, void *, asymbol *);
916 /* This function, if defined, is called after all local symbols and
917 global symbols converted to locals are emitted into the symtab
918 section. It allows the backend to emit special local symbols
919 not handled in the hash table. */
920 bfd_boolean (*elf_backend_output_arch_local_syms)
921 (bfd *, struct bfd_link_info *, void *,
922 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
923 struct elf_link_hash_entry *));
925 /* This function, if defined, is called after all symbols are emitted
926 into the symtab section. It allows the backend to emit special
927 global symbols not handled in the hash table. */
928 bfd_boolean (*elf_backend_output_arch_syms)
929 (bfd *, struct bfd_link_info *, void *,
930 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
931 struct elf_link_hash_entry *));
933 /* Copy any information related to dynamic linking from a pre-existing
934 symbol to a newly created symbol. Also called to copy flags and
935 other back-end info to a weakdef, in which case the symbol is not
936 newly created and plt/got refcounts and dynamic indices should not
938 void (*elf_backend_copy_indirect_symbol)
939 (struct bfd_link_info *, struct elf_link_hash_entry *,
940 struct elf_link_hash_entry *);
942 /* Modify any information related to dynamic linking such that the
943 symbol is not exported. */
944 void (*elf_backend_hide_symbol)
945 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
947 /* A function to do additional symbol fixup, called by
948 _bfd_elf_fix_symbol_flags. */
949 bfd_boolean (*elf_backend_fixup_symbol)
950 (struct bfd_link_info *, struct elf_link_hash_entry *);
952 /* Merge the backend specific symbol attribute. */
953 void (*elf_backend_merge_symbol_attribute)
954 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
957 /* Decide whether an undefined symbol is special and can be ignored.
958 This is the case for OPTIONAL symbols on IRIX. */
959 bfd_boolean (*elf_backend_ignore_undef_symbol)
960 (struct elf_link_hash_entry *);
962 /* Emit relocations. Overrides default routine for emitting relocs,
963 except during a relocatable link, or if all relocs are being emitted. */
964 bfd_boolean (*elf_backend_emit_relocs)
965 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
966 struct elf_link_hash_entry **);
968 /* Count relocations. Not called for relocatable links
969 or if all relocs are being preserved in the output. */
970 unsigned int (*elf_backend_count_relocs)
971 (asection *, Elf_Internal_Rela *);
973 /* This function, if defined, is called when an NT_PRSTATUS note is found
975 bfd_boolean (*elf_backend_grok_prstatus)
976 (bfd *, Elf_Internal_Note *);
978 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
979 note is found in a core file. */
980 bfd_boolean (*elf_backend_grok_psinfo)
981 (bfd *, Elf_Internal_Note *);
983 /* This function, if defined, is called to write a note to a corefile. */
984 char *(*elf_backend_write_core_note)
985 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
987 /* This function returns class of a reloc type. */
988 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
989 (const Elf_Internal_Rela *);
991 /* This function, if defined, removes information about discarded functions
992 from other sections which mention them. */
993 bfd_boolean (*elf_backend_discard_info)
994 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
996 /* This function, if defined, signals that the function above has removed
997 the discarded relocations for this section. */
998 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1001 /* What to do when ld finds relocations against symbols defined in
1002 discarded sections. */
1003 unsigned int (*action_discarded)
1006 /* This function returns the width of FDE pointers in bytes, or 0 if
1007 that can't be determined for some reason. The default definition
1008 goes by the bfd's EI_CLASS. */
1009 unsigned int (*elf_backend_eh_frame_address_size)
1010 (bfd *, asection *);
1012 /* These functions tell elf-eh-frame whether to attempt to turn
1013 absolute or lsda encodings into pc-relative ones. The default
1014 definition enables these transformations. */
1015 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1016 (bfd *, struct bfd_link_info *, asection *);
1017 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1018 (bfd *, struct bfd_link_info *, asection *);
1020 /* This function returns an encoding after computing the encoded
1021 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1022 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1023 The default definition chooses a 32-bit PC-relative encoding. */
1024 bfd_byte (*elf_backend_encode_eh_address)
1025 (bfd *abfd, struct bfd_link_info *info,
1026 asection *osec, bfd_vma offset,
1027 asection *loc_sec, bfd_vma loc_offset,
1030 /* This function, if defined, may write out the given section.
1031 Returns TRUE if it did so and FALSE if the caller should. */
1032 bfd_boolean (*elf_backend_write_section)
1033 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1035 /* The level of IRIX compatibility we're striving for.
1036 MIPS ELF specific function. */
1037 irix_compat_t (*elf_backend_mips_irix_compat)
1040 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1041 (unsigned int, bfd_boolean);
1043 /* The swapping table to use when dealing with ECOFF information.
1044 Used for the MIPS ELF .mdebug section. */
1045 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1047 /* This function implements `bfd_elf_bfd_from_remote_memory';
1048 see elf.c, elfcode.h. */
1049 bfd *(*elf_backend_bfd_from_remote_memory)
1050 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1051 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1053 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1055 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1057 /* Is symbol defined in common section? */
1058 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1060 /* Return a common section index for section. */
1061 unsigned int (*common_section_index) (asection *);
1063 /* Return a common section for section. */
1064 asection *(*common_section) (asection *);
1066 /* Return TRUE if we can merge 2 definitions. */
1067 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1068 struct elf_link_hash_entry **,
1069 struct elf_link_hash_entry *,
1070 Elf_Internal_Sym *, asection **,
1071 bfd_vma *, unsigned int *,
1072 bfd_boolean *, bfd_boolean *,
1073 bfd_boolean *, bfd_boolean *,
1074 bfd_boolean *, bfd_boolean *,
1075 bfd_boolean *, bfd_boolean *,
1077 bfd_boolean *, bfd_boolean *,
1078 bfd_boolean *, bfd_boolean *,
1079 bfd *, asection **);
1081 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1082 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1084 /* Return TRUE if type is a function symbol type. */
1085 bfd_boolean (*is_function_type) (unsigned int type);
1087 /* Used to handle bad SHF_LINK_ORDER input. */
1088 bfd_error_handler_type link_order_error_handler;
1090 /* Name of the PLT relocation section. */
1091 const char *relplt_name;
1093 /* Alternate EM_xxxx machine codes for this backend. */
1094 int elf_machine_alt1;
1095 int elf_machine_alt2;
1097 const struct elf_size_info *s;
1099 /* An array of target specific special sections. */
1100 const struct bfd_elf_special_section *special_sections;
1102 /* The size in bytes of the header for the GOT. This includes the
1103 so-called reserved entries on some systems. */
1104 bfd_vma got_header_size;
1106 /* The vendor name to use for a processor-standard attributes section. */
1107 const char *obj_attrs_vendor;
1109 /* The section name to use for a processor-standard attributes section. */
1110 const char *obj_attrs_section;
1112 /* Return 1, 2 or 3 to indicate what type of arguments a
1113 processor-specific tag takes. */
1114 int (*obj_attrs_arg_type) (int);
1116 /* The section type to use for an attributes section. */
1117 unsigned int obj_attrs_section_type;
1119 /* This is TRUE if the linker should act like collect and gather
1120 global constructors and destructors by name. This is TRUE for
1121 MIPS ELF because the Irix 5 tools can not handle the .init
1123 unsigned collect : 1;
1125 /* This is TRUE if the linker should ignore changes to the type of a
1126 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1127 record undefined functions as STT_OBJECT although the definitions
1129 unsigned type_change_ok : 1;
1131 /* Whether the backend may use REL relocations. (Some backends use
1132 both REL and RELA relocations, and this flag is set for those
1134 unsigned may_use_rel_p : 1;
1136 /* Whether the backend may use RELA relocations. (Some backends use
1137 both REL and RELA relocations, and this flag is set for those
1139 unsigned may_use_rela_p : 1;
1141 /* Whether the default relocation type is RELA. If a backend with
1142 this flag set wants REL relocations for a particular section,
1143 it must note that explicitly. Similarly, if this flag is clear,
1144 and the backend wants RELA relocations for a particular
1146 unsigned default_use_rela_p : 1;
1148 /* Set if RELA relocations for a relocatable link can be handled by
1149 generic code. Backends that set this flag need do nothing in the
1150 backend relocate_section routine for relocatable linking. */
1151 unsigned rela_normal : 1;
1153 /* TRUE if addresses "naturally" sign extend. This is used when
1154 swapping in from Elf32 when BFD64. */
1155 unsigned sign_extend_vma : 1;
1157 unsigned want_got_plt : 1;
1158 unsigned plt_readonly : 1;
1159 unsigned want_plt_sym : 1;
1160 unsigned plt_not_loaded : 1;
1161 unsigned plt_alignment : 4;
1162 unsigned can_gc_sections : 1;
1163 unsigned can_refcount : 1;
1164 unsigned want_got_sym : 1;
1165 unsigned want_dynbss : 1;
1167 /* Targets which do not support physical addressing often require
1168 that the p_paddr field in the section header to be set to zero.
1169 This field indicates whether this behavior is required. */
1170 unsigned want_p_paddr_set_to_zero : 1;
1172 /* True if an object file lacking a .note.GNU-stack section
1173 should be assumed to be requesting exec stack. At least one
1174 other file in the link needs to have a .note.GNU-stack section
1175 for a PT_GNU_STACK segment to be created. */
1176 unsigned default_execstack : 1;
1179 /* Information stored for each BFD section in an ELF file. This
1180 structure is allocated by elf_new_section_hook. */
1182 struct bfd_elf_section_data
1184 /* The ELF header for this section. */
1185 Elf_Internal_Shdr this_hdr;
1187 /* The ELF header for the reloc section associated with this
1189 Elf_Internal_Shdr rel_hdr;
1191 /* If there is a second reloc section associated with this section,
1192 as can happen on Irix 6, this field points to the header. */
1193 Elf_Internal_Shdr *rel_hdr2;
1195 /* The number of relocations currently assigned to REL_HDR. */
1196 unsigned int rel_count;
1198 /* The number of relocations currently assigned to REL_HDR2. */
1199 unsigned int rel_count2;
1201 /* The ELF section number of this section. */
1204 /* The ELF section number of the reloc section indicated by
1205 REL_HDR if any. Only used for an output file. */
1208 /* The ELF section number of the reloc section indicated by
1209 REL_HDR2 if any. Only used for an output file. */
1212 /* Used by the backend linker when generating a shared library to
1213 record the dynamic symbol index for a section symbol
1214 corresponding to this section. A value of 0 means that there is
1215 no dynamic symbol for this section. */
1218 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1219 asection *linked_to;
1221 /* Used by the backend linker to store the symbol hash table entries
1222 associated with relocs against global symbols. */
1223 struct elf_link_hash_entry **rel_hashes;
1225 /* A pointer to the swapped relocs. If the section uses REL relocs,
1226 rather than RELA, all the r_addend fields will be zero. This
1227 pointer may be NULL. It is used by the backend linker. */
1228 Elf_Internal_Rela *relocs;
1230 /* A pointer to a linked list tracking dynamic relocs copied for
1234 /* A pointer to the bfd section used for dynamic relocs. */
1238 /* Group name, if this section is a member of a group. */
1241 /* Group signature sym, if this is the SHT_GROUP section. */
1242 struct bfd_symbol *id;
1245 /* For a member of a group, points to the SHT_GROUP section.
1246 NULL for the SHT_GROUP section itself and non-group sections. */
1247 asection *sec_group;
1249 /* A linked list of member sections in the group. Circular when used by
1250 the linker. For the SHT_GROUP section, points at first member. */
1251 asection *next_in_group;
1253 /* The FDEs associated with this section. The u.fde.next_in_section
1254 field acts as a chain pointer. */
1255 struct eh_cie_fde *fde_list;
1257 /* A pointer used for various section optimizations. */
1261 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1262 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1263 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1264 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1265 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1266 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1267 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1268 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1269 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1271 #define xvec_get_elf_backend_data(xvec) \
1272 ((const struct elf_backend_data *) (xvec)->backend_data)
1274 #define get_elf_backend_data(abfd) \
1275 xvec_get_elf_backend_data ((abfd)->xvec)
1277 /* This struct is used to pass information to routines called via
1278 elf_link_hash_traverse which must return failure. */
1280 struct elf_info_failed
1283 struct bfd_link_info *info;
1284 struct bfd_elf_version_tree *verdefs;
1287 /* This structure is used to pass information to
1288 _bfd_elf_link_assign_sym_version. */
1290 struct elf_assign_sym_version_info
1294 /* General link information. */
1295 struct bfd_link_info *info;
1297 struct bfd_elf_version_tree *verdefs;
1298 /* Whether we had a failure. */
1302 /* This structure is used to pass information to
1303 _bfd_elf_link_find_version_dependencies. */
1305 struct elf_find_verdep_info
1309 /* General link information. */
1310 struct bfd_link_info *info;
1311 /* The number of dependencies. */
1313 /* Whether we had a failure. */
1317 /* The maximum number of known object attributes for any target. */
1318 #define NUM_KNOWN_OBJ_ATTRIBUTES 32
1320 /* The value of an object attribute. type & 1 indicates whether there
1321 is an integer value; type & 2 indicates whether there is a string
1324 typedef struct obj_attribute
1331 typedef struct obj_attribute_list
1333 struct obj_attribute_list *next;
1336 } obj_attribute_list;
1338 /* Object attributes may either be defined by the processor ABI, index
1339 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1340 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1341 #define OBJ_ATTR_PROC 0
1342 #define OBJ_ATTR_GNU 1
1343 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1344 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1346 /* The following object attribute tags are taken as generic, for all
1347 targets and for "gnu" where there is no target standard. */
1354 Tag_compatibility = 32
1357 /* Some private data is stashed away for future use using the tdata pointer
1358 in the bfd structure. */
1360 struct elf_obj_tdata
1362 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1363 Elf_Internal_Shdr **elf_sect_ptr;
1364 Elf_Internal_Phdr *phdr;
1365 struct elf_segment_map *segment_map;
1366 struct elf_strtab_hash *strtab_ptr;
1369 unsigned int num_elf_sections; /* elf_sect_ptr size */
1370 int num_section_syms;
1371 asymbol **section_syms; /* STT_SECTION symbols for each section */
1372 Elf_Internal_Shdr symtab_hdr;
1373 Elf_Internal_Shdr shstrtab_hdr;
1374 Elf_Internal_Shdr strtab_hdr;
1375 Elf_Internal_Shdr dynsymtab_hdr;
1376 Elf_Internal_Shdr dynstrtab_hdr;
1377 Elf_Internal_Shdr dynversym_hdr;
1378 Elf_Internal_Shdr dynverref_hdr;
1379 Elf_Internal_Shdr dynverdef_hdr;
1380 Elf_Internal_Shdr symtab_shndx_hdr;
1381 unsigned int symtab_section, shstrtab_section;
1382 unsigned int strtab_section, dynsymtab_section;
1383 unsigned int symtab_shndx_section;
1384 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1385 file_ptr next_file_pos;
1386 bfd_vma gp; /* The gp value */
1387 unsigned int gp_size; /* The gp size */
1389 /* Information grabbed from an elf core file. */
1396 /* A mapping from external symbols to entries in the linker hash
1397 table, used when linking. This is indexed by the symbol index
1398 minus the sh_info field of the symbol table header. */
1399 struct elf_link_hash_entry **sym_hashes;
1401 /* Track usage and final offsets of GOT entries for local symbols.
1402 This array is indexed by symbol index. Elements are used
1403 identically to "got" in struct elf_link_hash_entry. */
1406 bfd_signed_vma *refcounts;
1408 struct got_entry **ents;
1411 /* The linker ELF emulation code needs to let the backend ELF linker
1412 know what filename should be used for a dynamic object if the
1413 dynamic object is found using a search. The emulation code then
1414 sometimes needs to know what name was actually used. Until the
1415 file has been added to the linker symbol table, this field holds
1416 the name the linker wants. After it has been added, it holds the
1417 name actually used, which will be the DT_SONAME entry if there is
1419 const char *dt_name;
1421 /* Records the result of `get_program_header_size'. */
1422 bfd_size_type program_header_size;
1424 /* Used by find_nearest_line entry point. */
1427 /* Used by MIPS ELF find_nearest_line entry point. The structure
1428 could be included directly in this one, but there's no point to
1429 wasting the memory just for the infrequently called
1430 find_nearest_line. */
1431 struct mips_elf_find_line *find_line_info;
1433 /* A place to stash dwarf1 info for this bfd. */
1434 struct dwarf1_debug *dwarf1_find_line_info;
1436 /* A place to stash dwarf2 info for this bfd. */
1437 void *dwarf2_find_line_info;
1439 /* An array of stub sections indexed by symbol number, used by the
1440 MIPS ELF linker. FIXME: We should figure out some way to only
1441 include this field for a MIPS ELF target. */
1442 asection **local_stubs;
1443 asection **local_call_stubs;
1445 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1447 asection *eh_frame_hdr;
1449 Elf_Internal_Shdr **group_sect_ptr;
1452 /* Number of symbol version definitions we are about to emit. */
1453 unsigned int cverdefs;
1455 /* Number of symbol version references we are about to emit. */
1456 unsigned int cverrefs;
1458 /* Segment flags for the PT_GNU_STACK segment. */
1459 unsigned int stack_flags;
1461 /* Symbol version definitions in external objects. */
1462 Elf_Internal_Verdef *verdef;
1464 /* Symbol version references to external objects. */
1465 Elf_Internal_Verneed *verref;
1467 /* The Irix 5 support uses two virtual sections, which represent
1468 text/data symbols defined in dynamic objects. */
1469 asymbol *elf_data_symbol;
1470 asymbol *elf_text_symbol;
1471 asection *elf_data_section;
1472 asection *elf_text_section;
1474 /* A pointer to the .eh_frame section. */
1475 asection *eh_frame_section;
1477 /* Whether a dyanmic object was specified normally on the linker
1478 command line, or was specified when --as-needed was in effect,
1479 or was found via a DT_NEEDED entry. */
1480 enum dynamic_lib_link_class dyn_lib_class;
1482 /* This is set to TRUE if the object was created by the backend
1486 /* Irix 5 often screws up the symbol table, sorting local symbols
1487 after global symbols. This flag is set if the symbol table in
1488 this BFD appears to be screwed up. If it is, we ignore the
1489 sh_info field in the symbol table header, and always read all the
1491 bfd_boolean bad_symtab;
1493 /* Used to determine if the e_flags field has been initialized */
1494 bfd_boolean flags_init;
1496 /* Symbol buffer. */
1499 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1500 obj_attribute_list *other_obj_attributes[2];
1502 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1503 bfd_boolean (*after_write_object_contents) (bfd *);
1504 void *after_write_object_contents_info;
1506 /* NT_GNU_BUILD_ID note type. */
1507 bfd_size_type build_id_size;
1511 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1512 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1513 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1514 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1515 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1516 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1517 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1518 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1519 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1520 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1521 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1522 #define elf_eh_frame_section(bfd) \
1523 (elf_tdata(bfd) -> eh_frame_section)
1524 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1525 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1526 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1527 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1528 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1529 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1530 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1531 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1532 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1533 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1534 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1535 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1536 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1537 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1538 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1539 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1540 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1541 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1542 #define elf_known_obj_attributes_proc(bfd) \
1543 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1544 #define elf_other_obj_attributes_proc(bfd) \
1545 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1547 extern void _bfd_elf_swap_verdef_in
1548 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1549 extern void _bfd_elf_swap_verdef_out
1550 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1551 extern void _bfd_elf_swap_verdaux_in
1552 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1553 extern void _bfd_elf_swap_verdaux_out
1554 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1555 extern void _bfd_elf_swap_verneed_in
1556 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1557 extern void _bfd_elf_swap_verneed_out
1558 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1559 extern void _bfd_elf_swap_vernaux_in
1560 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1561 extern void _bfd_elf_swap_vernaux_out
1562 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1563 extern void _bfd_elf_swap_versym_in
1564 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1565 extern void _bfd_elf_swap_versym_out
1566 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1568 extern int _bfd_elf_section_from_bfd_section
1569 (bfd *, asection *);
1570 extern char *bfd_elf_string_from_elf_section
1571 (bfd *, unsigned, unsigned);
1572 extern char *bfd_elf_get_str_section
1574 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1575 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1576 Elf_External_Sym_Shndx *);
1577 extern const char *bfd_elf_sym_name
1578 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1580 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1582 extern bfd_boolean _bfd_elf_print_private_bfd_data
1584 extern void bfd_elf_print_symbol
1585 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1587 extern unsigned int _bfd_elf_eh_frame_address_size
1588 (bfd *, asection *);
1589 extern bfd_byte _bfd_elf_encode_eh_address
1590 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1591 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1592 extern bfd_boolean _bfd_elf_can_make_relative
1593 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1595 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1596 (const Elf_Internal_Rela *);
1597 extern bfd_vma _bfd_elf_rela_local_sym
1598 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1599 extern bfd_vma _bfd_elf_rel_local_sym
1600 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1601 extern bfd_vma _bfd_elf_section_offset
1602 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1604 extern unsigned long bfd_elf_hash
1606 extern unsigned long bfd_elf_gnu_hash
1609 extern bfd_reloc_status_type bfd_elf_generic_reloc
1610 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1611 extern bfd_boolean bfd_elf_mkobject
1613 extern bfd_boolean bfd_elf_mkcorefile
1615 extern Elf_Internal_Shdr *bfd_elf_find_section
1617 extern bfd_boolean _bfd_elf_make_section_from_shdr
1618 (bfd *, Elf_Internal_Shdr *, const char *, int);
1619 extern bfd_boolean _bfd_elf_make_section_from_phdr
1620 (bfd *, Elf_Internal_Phdr *, int, const char *);
1621 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1622 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1623 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1625 extern void _bfd_elf_link_hash_copy_indirect
1626 (struct bfd_link_info *, struct elf_link_hash_entry *,
1627 struct elf_link_hash_entry *);
1628 extern void _bfd_elf_link_hash_hide_symbol
1629 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1630 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1631 (struct bfd_link_info *, struct elf_link_hash_entry *);
1632 extern bfd_boolean _bfd_elf_link_hash_table_init
1633 (struct elf_link_hash_table *, bfd *,
1634 struct bfd_hash_entry *(*)
1635 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1637 extern bfd_boolean _bfd_elf_slurp_version_tables
1638 (bfd *, bfd_boolean);
1639 extern bfd_boolean _bfd_elf_merge_sections
1640 (bfd *, struct bfd_link_info *);
1641 extern bfd_boolean _bfd_elf_match_sections_by_type
1642 (bfd *, const asection *, bfd *, const asection *);
1643 extern bfd_boolean bfd_elf_is_group_section
1644 (bfd *, const struct bfd_section *);
1645 extern void _bfd_elf_section_already_linked
1646 (bfd *, struct bfd_section *, struct bfd_link_info *);
1647 extern void bfd_elf_set_group_contents
1648 (bfd *, asection *, void *);
1649 extern asection *_bfd_elf_check_kept_section
1650 (asection *, struct bfd_link_info *);
1651 extern void _bfd_elf_link_just_syms
1652 (asection *, struct bfd_link_info *);
1653 extern bfd_boolean _bfd_elf_copy_private_header_data
1655 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1656 (bfd *, asymbol *, bfd *, asymbol *);
1657 #define _bfd_generic_init_private_section_data \
1658 _bfd_elf_init_private_section_data
1659 extern bfd_boolean _bfd_elf_init_private_section_data
1660 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1661 extern bfd_boolean _bfd_elf_copy_private_section_data
1662 (bfd *, asection *, bfd *, asection *);
1663 extern bfd_boolean _bfd_elf_write_object_contents
1665 extern bfd_boolean _bfd_elf_write_corefile_contents
1667 extern bfd_boolean _bfd_elf_set_section_contents
1668 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1669 extern long _bfd_elf_get_symtab_upper_bound
1671 extern long _bfd_elf_canonicalize_symtab
1672 (bfd *, asymbol **);
1673 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1675 extern long _bfd_elf_canonicalize_dynamic_symtab
1676 (bfd *, asymbol **);
1677 extern long _bfd_elf_get_synthetic_symtab
1678 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1679 extern long _bfd_elf_get_reloc_upper_bound
1681 extern long _bfd_elf_canonicalize_reloc
1682 (bfd *, sec_ptr, arelent **, asymbol **);
1683 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1685 extern long _bfd_elf_canonicalize_dynamic_reloc
1686 (bfd *, arelent **, asymbol **);
1687 extern asymbol *_bfd_elf_make_empty_symbol
1689 extern void _bfd_elf_get_symbol_info
1690 (bfd *, asymbol *, symbol_info *);
1691 extern bfd_boolean _bfd_elf_is_local_label_name
1692 (bfd *, const char *);
1693 extern alent *_bfd_elf_get_lineno
1695 extern bfd_boolean _bfd_elf_set_arch_mach
1696 (bfd *, enum bfd_architecture, unsigned long);
1697 extern bfd_boolean _bfd_elf_find_nearest_line
1698 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1700 extern bfd_boolean _bfd_elf_find_line
1701 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1702 #define _bfd_generic_find_line _bfd_elf_find_line
1703 extern bfd_boolean _bfd_elf_find_inliner_info
1704 (bfd *, const char **, const char **, unsigned int *);
1705 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1706 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1707 extern int _bfd_elf_sizeof_headers
1708 (bfd *, struct bfd_link_info *);
1709 extern bfd_boolean _bfd_elf_new_section_hook
1710 (bfd *, asection *);
1711 extern bfd_boolean _bfd_elf_init_reloc_shdr
1712 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1713 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1714 (const char *, const struct bfd_elf_special_section *, unsigned int);
1715 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1716 (bfd *, asection *);
1718 /* If the target doesn't have reloc handling written yet: */
1719 extern void _bfd_elf_no_info_to_howto
1720 (bfd *, arelent *, Elf_Internal_Rela *);
1722 extern bfd_boolean bfd_section_from_shdr
1723 (bfd *, unsigned int shindex);
1724 extern bfd_boolean bfd_section_from_phdr
1725 (bfd *, Elf_Internal_Phdr *, int);
1727 extern int _bfd_elf_symbol_from_bfd_symbol
1728 (bfd *, asymbol **);
1730 extern asection *bfd_section_from_r_symndx
1731 (bfd *, struct sym_sec_cache *, asection *, unsigned long);
1732 extern asection *bfd_section_from_elf_index
1733 (bfd *, unsigned int);
1734 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1737 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1739 extern void _bfd_elf_strtab_free
1740 (struct elf_strtab_hash *);
1741 extern bfd_size_type _bfd_elf_strtab_add
1742 (struct elf_strtab_hash *, const char *, bfd_boolean);
1743 extern void _bfd_elf_strtab_addref
1744 (struct elf_strtab_hash *, bfd_size_type);
1745 extern void _bfd_elf_strtab_delref
1746 (struct elf_strtab_hash *, bfd_size_type);
1747 extern void _bfd_elf_strtab_clear_all_refs
1748 (struct elf_strtab_hash *);
1749 extern bfd_size_type _bfd_elf_strtab_size
1750 (struct elf_strtab_hash *);
1751 extern bfd_size_type _bfd_elf_strtab_offset
1752 (struct elf_strtab_hash *, bfd_size_type);
1753 extern bfd_boolean _bfd_elf_strtab_emit
1754 (bfd *, struct elf_strtab_hash *);
1755 extern void _bfd_elf_strtab_finalize
1756 (struct elf_strtab_hash *);
1758 extern void _bfd_elf_begin_eh_frame_parsing
1759 (struct bfd_link_info *info);
1760 extern void _bfd_elf_parse_eh_frame
1761 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1762 extern void _bfd_elf_end_eh_frame_parsing
1763 (struct bfd_link_info *info);
1765 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1766 (bfd *, struct bfd_link_info *, asection *,
1767 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1768 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1769 (bfd *, struct bfd_link_info *);
1770 extern bfd_vma _bfd_elf_eh_frame_section_offset
1771 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1772 extern bfd_boolean _bfd_elf_write_section_eh_frame
1773 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1774 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1775 (bfd *, struct bfd_link_info *);
1776 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1777 (struct bfd_link_info *);
1779 extern bfd_boolean _bfd_elf_merge_symbol
1780 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1781 asection **, bfd_vma *, unsigned int *,
1782 struct elf_link_hash_entry **, bfd_boolean *,
1783 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1785 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1787 extern bfd_boolean _bfd_elf_add_default_symbol
1788 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
1789 const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
1790 bfd_boolean *, bfd_boolean);
1792 extern bfd_boolean _bfd_elf_export_symbol
1793 (struct elf_link_hash_entry *, void *);
1795 extern bfd_boolean _bfd_elf_link_find_version_dependencies
1796 (struct elf_link_hash_entry *, void *);
1798 extern bfd_boolean _bfd_elf_link_assign_sym_version
1799 (struct elf_link_hash_entry *, void *);
1801 extern long _bfd_elf_link_lookup_local_dynindx
1802 (struct bfd_link_info *, bfd *, long);
1803 extern bfd_boolean _bfd_elf_compute_section_file_positions
1804 (bfd *, struct bfd_link_info *);
1805 extern void _bfd_elf_assign_file_positions_for_relocs
1807 extern file_ptr _bfd_elf_assign_file_position_for_section
1808 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1810 extern bfd_boolean _bfd_elf_validate_reloc
1813 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1814 (bfd *, struct bfd_link_info *);
1815 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1816 (bfd *, struct bfd_link_info *, asection *);
1817 extern bfd_boolean _bfd_elf_create_dynamic_sections
1818 (bfd *, struct bfd_link_info *);
1819 extern bfd_boolean _bfd_elf_create_got_section
1820 (bfd *, struct bfd_link_info *);
1821 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1822 (bfd *, struct bfd_link_info *, asection *, const char *);
1823 extern void _bfd_elf_init_1_index_section
1824 (bfd *, struct bfd_link_info *);
1825 extern void _bfd_elf_init_2_index_sections
1826 (bfd *, struct bfd_link_info *);
1828 extern bfd_boolean _bfd_elfcore_make_pseudosection
1829 (bfd *, char *, size_t, ufile_ptr);
1830 extern char *_bfd_elfcore_strndup
1831 (bfd *, char *, size_t);
1833 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1834 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1836 extern bfd_boolean _bfd_elf_link_size_reloc_section
1837 (bfd *, Elf_Internal_Shdr *, asection *);
1839 extern bfd_boolean _bfd_elf_link_output_relocs
1840 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1841 struct elf_link_hash_entry **);
1843 extern bfd_boolean _bfd_elf_fix_symbol_flags
1844 (struct elf_link_hash_entry *, struct elf_info_failed *);
1846 extern bfd_boolean _bfd_elf_adjust_dynamic_symbol
1847 (struct elf_link_hash_entry *, void *);
1849 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1850 (struct elf_link_hash_entry *, asection *);
1852 extern bfd_boolean _bfd_elf_link_sec_merge_syms
1853 (struct elf_link_hash_entry *, void *);
1855 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1856 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1858 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1859 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1861 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1862 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
1864 extern bfd_boolean _bfd_elf_setup_sections
1867 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
1869 extern const bfd_target *bfd_elf32_object_p
1871 extern const bfd_target *bfd_elf32_core_file_p
1873 extern char *bfd_elf32_core_file_failing_command
1875 extern int bfd_elf32_core_file_failing_signal
1877 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1880 extern bfd_boolean bfd_elf32_swap_symbol_in
1881 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1882 extern void bfd_elf32_swap_symbol_out
1883 (bfd *, const Elf_Internal_Sym *, void *, void *);
1884 extern void bfd_elf32_swap_reloc_in
1885 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1886 extern void bfd_elf32_swap_reloc_out
1887 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1888 extern void bfd_elf32_swap_reloca_in
1889 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1890 extern void bfd_elf32_swap_reloca_out
1891 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1892 extern void bfd_elf32_swap_phdr_in
1893 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
1894 extern void bfd_elf32_swap_phdr_out
1895 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
1896 extern void bfd_elf32_swap_dyn_in
1897 (bfd *, const void *, Elf_Internal_Dyn *);
1898 extern void bfd_elf32_swap_dyn_out
1899 (bfd *, const Elf_Internal_Dyn *, void *);
1900 extern long bfd_elf32_slurp_symbol_table
1901 (bfd *, asymbol **, bfd_boolean);
1902 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
1904 extern int bfd_elf32_write_out_phdrs
1905 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1906 extern bfd_boolean bfd_elf32_checksum_contents
1907 (bfd * , void (*) (const void *, size_t, void *), void *);
1908 extern void bfd_elf32_write_relocs
1909 (bfd *, asection *, void *);
1910 extern bfd_boolean bfd_elf32_slurp_reloc_table
1911 (bfd *, asection *, asymbol **, bfd_boolean);
1913 extern const bfd_target *bfd_elf64_object_p
1915 extern const bfd_target *bfd_elf64_core_file_p
1917 extern char *bfd_elf64_core_file_failing_command
1919 extern int bfd_elf64_core_file_failing_signal
1921 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
1924 extern bfd_boolean bfd_elf64_swap_symbol_in
1925 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1926 extern void bfd_elf64_swap_symbol_out
1927 (bfd *, const Elf_Internal_Sym *, void *, void *);
1928 extern void bfd_elf64_swap_reloc_in
1929 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1930 extern void bfd_elf64_swap_reloc_out
1931 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1932 extern void bfd_elf64_swap_reloca_in
1933 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1934 extern void bfd_elf64_swap_reloca_out
1935 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1936 extern void bfd_elf64_swap_phdr_in
1937 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
1938 extern void bfd_elf64_swap_phdr_out
1939 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
1940 extern void bfd_elf64_swap_dyn_in
1941 (bfd *, const void *, Elf_Internal_Dyn *);
1942 extern void bfd_elf64_swap_dyn_out
1943 (bfd *, const Elf_Internal_Dyn *, void *);
1944 extern long bfd_elf64_slurp_symbol_table
1945 (bfd *, asymbol **, bfd_boolean);
1946 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
1948 extern int bfd_elf64_write_out_phdrs
1949 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1950 extern bfd_boolean bfd_elf64_checksum_contents
1951 (bfd * , void (*) (const void *, size_t, void *), void *);
1952 extern void bfd_elf64_write_relocs
1953 (bfd *, asection *, void *);
1954 extern bfd_boolean bfd_elf64_slurp_reloc_table
1955 (bfd *, asection *, asymbol **, bfd_boolean);
1957 extern bfd_boolean _bfd_elf_default_relocs_compatible
1958 (const bfd_target *, const bfd_target *);
1960 extern bfd_boolean _bfd_elf_relocs_compatible
1961 (const bfd_target *, const bfd_target *);
1963 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
1964 (bfd *, struct bfd_link_info *, const char *);
1965 extern bfd_boolean bfd_elf_link_add_symbols
1966 (bfd *, struct bfd_link_info *);
1967 extern bfd_boolean _bfd_elf_add_dynamic_entry
1968 (struct bfd_link_info *, bfd_vma, bfd_vma);
1970 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
1971 (struct bfd_link_info *, struct elf_link_hash_entry *);
1973 extern int bfd_elf_link_record_local_dynamic_symbol
1974 (struct bfd_link_info *, bfd *, long);
1976 extern void bfd_elf_link_mark_dynamic_symbol
1977 (struct bfd_link_info *, struct elf_link_hash_entry *,
1978 Elf_Internal_Sym *);
1980 extern bfd_boolean _bfd_elf_close_and_cleanup
1983 extern bfd_boolean _bfd_elf_common_definition
1984 (Elf_Internal_Sym *);
1986 extern unsigned int _bfd_elf_common_section_index
1989 extern asection *_bfd_elf_common_section
1992 extern void _bfd_dwarf2_cleanup_debug_info
1995 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
1996 (bfd *, arelent *, struct bfd_symbol *, void *,
1997 asection *, bfd *, char **);
1999 extern bfd_boolean bfd_elf_final_link
2000 (bfd *, struct bfd_link_info *);
2002 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2003 (struct elf_link_hash_entry *h, void *inf);
2005 extern bfd_boolean bfd_elf_gc_sections
2006 (bfd *, struct bfd_link_info *);
2008 extern bfd_boolean bfd_elf_gc_record_vtinherit
2009 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2011 extern bfd_boolean bfd_elf_gc_record_vtentry
2012 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2014 extern asection *_bfd_elf_gc_mark_hook
2015 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2016 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2018 extern asection *_bfd_elf_gc_mark_rsec
2019 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2020 struct elf_reloc_cookie *);
2022 extern bfd_boolean _bfd_elf_gc_mark_reloc
2023 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2024 struct elf_reloc_cookie *);
2026 extern bfd_boolean _bfd_elf_gc_mark_fdes
2027 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2028 struct elf_reloc_cookie *);
2030 extern bfd_boolean _bfd_elf_gc_mark
2031 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2033 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2034 (bfd *, struct bfd_link_info *);
2036 extern bfd_boolean bfd_elf_gc_common_final_link
2037 (bfd *, struct bfd_link_info *);
2039 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2042 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2043 (bfd *, asection *);
2045 extern bfd_boolean _bfd_elf_map_sections_to_segments
2046 (bfd *, struct bfd_link_info *);
2048 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2050 /* Exported interface for writing elf corefile notes. */
2051 extern char *elfcore_write_note
2052 (bfd *, char *, int *, const char *, int, const void *, int);
2053 extern char *elfcore_write_prpsinfo
2054 (bfd *, char *, int *, const char *, const char *);
2055 extern char *elfcore_write_prstatus
2056 (bfd *, char *, int *, long, int, const void *);
2057 extern char * elfcore_write_pstatus
2058 (bfd *, char *, int *, long, int, const void *);
2059 extern char *elfcore_write_prfpreg
2060 (bfd *, char *, int *, const void *, int);
2061 extern char *elfcore_write_prxfpreg
2062 (bfd *, char *, int *, const void *, int);
2063 extern char *elfcore_write_ppc_vmx
2064 (bfd *, char *, int *, const void *, int);
2065 extern char *elfcore_write_lwpstatus
2066 (bfd *, char *, int *, long, int, const void *);
2068 extern bfd *_bfd_elf32_bfd_from_remote_memory
2069 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2070 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2071 extern bfd *_bfd_elf64_bfd_from_remote_memory
2072 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2073 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2075 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2076 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2077 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2078 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2079 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2080 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2081 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2082 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2083 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2084 extern void bfd_elf_add_obj_attr_compat (bfd *, int, unsigned int,
2086 #define bfd_elf_add_proc_attr_compat(BFD, INTVAL, STRVAL) \
2087 bfd_elf_add_obj_attr_compat ((BFD), OBJ_ATTR_PROC, (INTVAL), (STRVAL))
2089 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2090 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2091 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2092 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2093 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2095 /* Large common section. */
2096 extern asection _bfd_elf_large_com_section;
2098 /* SH ELF specific routine. */
2100 extern bfd_boolean _sh_elf_set_mach_from_flags
2103 /* This is the condition under which finish_dynamic_symbol will be called.
2104 If our finish_dynamic_symbol isn't called, we'll need to do something
2105 about initializing any .plt and .got entries in relocate_section. */
2106 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2108 && ((SHARED) || !(H)->forced_local) \
2109 && ((H)->dynindx != -1 || (H)->forced_local))
2111 /* This macro is to avoid lots of duplicated code in the body
2112 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2113 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2114 r_symndx, symtab_hdr, sym_hashes, \
2115 h, sec, relocation, \
2116 unresolved_reloc, warned) \
2119 /* It seems this can happen with erroneous or unsupported \
2120 input (mixing a.out and elf in an archive, for example.) */ \
2121 if (sym_hashes == NULL) \
2124 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2126 while (h->root.type == bfd_link_hash_indirect \
2127 || h->root.type == bfd_link_hash_warning) \
2128 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2131 unresolved_reloc = FALSE; \
2133 if (h->root.type == bfd_link_hash_defined \
2134 || h->root.type == bfd_link_hash_defweak) \
2136 sec = h->root.u.def.section; \
2138 || sec->output_section == NULL) \
2139 /* Set a flag that will be cleared later if we find a \
2140 relocation value for this symbol. output_section \
2141 is typically NULL for symbols satisfied by a shared \
2143 unresolved_reloc = TRUE; \
2145 relocation = (h->root.u.def.value \
2146 + sec->output_section->vma \
2147 + sec->output_offset); \
2149 else if (h->root.type == bfd_link_hash_undefweak) \
2151 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2152 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2154 else if (!info->relocatable) \
2157 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2158 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2159 if (!info->callbacks->undefined_symbol (info, \
2160 h->root.root.string, \
2163 rel->r_offset, err)) \
2170 /* Will a symbol be bound to the the definition within the shared
2172 #define SYMBOLIC_BIND(INFO, H) \
2173 ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))
2175 #endif /* _LIBELF_H_ */