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, 2008 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/external.h"
28 #include "elf/internal.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 /* CIEs have three states:
281 - REMOVED && !MERGED: Slated for removal because we haven't yet
282 proven that an FDE needs it. FULL_CIE, if nonnull, points to
283 more detailed information about the CIE.
285 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
286 which may not belong to the same input section.
288 - !REMOVED: We have decided to keep this CIE. SEC is the
289 .eh_frame input section that contains the CIE. */
291 struct cie *full_cie;
292 struct eh_cie_fde *merged_with;
296 /* True if we have marked relocations associated with this CIE. */
297 unsigned int gc_mark : 1;
299 /* True if we have decided to turn an absolute LSDA encoding into
300 a PC-relative one. */
301 unsigned int make_lsda_relative : 1;
303 /* True if the CIE contains personality data and if that data
304 uses a PC-relative encoding. */
305 unsigned int per_encoding_relative : 1;
307 /* True if we need to add an 'R' (FDE encoding) entry to the
308 CIE's augmentation data. */
309 unsigned int add_fde_encoding : 1;
311 /* True if we have merged this CIE with another. */
312 unsigned int merged : 1;
315 unsigned int reloc_index;
318 unsigned int new_offset;
319 unsigned int fde_encoding : 8;
320 unsigned int lsda_encoding : 8;
321 unsigned int lsda_offset : 8;
323 /* True if this entry represents a CIE, false if it represents an FDE. */
324 unsigned int cie : 1;
326 /* True if this entry is currently marked for removal. */
327 unsigned int removed : 1;
329 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
330 augmentation data, and an associated byte to each of the CIE's FDEs. */
331 unsigned int add_augmentation_size : 1;
333 /* True if we have decided to convert absolute FDE relocations into
334 relative ones. This applies to the first relocation in the FDE,
335 which is against the code that the FDE describes. */
336 unsigned int make_relative : 1;
339 unsigned int pad1 : 4;
341 unsigned int *set_loc;
344 struct eh_frame_sec_info
348 struct eh_cie_fde entry[1];
351 struct eh_frame_array_ent
359 struct eh_frame_hdr_info
363 unsigned int fde_count, array_count;
364 struct eh_frame_array_ent *array;
365 /* TRUE if we should try to merge CIEs between input sections. */
366 bfd_boolean merge_cies;
367 /* TRUE if all .eh_frames have been parsd. */
368 bfd_boolean parsed_eh_frames;
369 /* TRUE if .eh_frame_hdr should contain the sorted search table.
370 We build it if we successfully read all .eh_frame input sections
371 and recognize them. */
375 /* ELF linker hash table. */
377 struct elf_link_hash_table
379 struct bfd_link_hash_table root;
381 /* Whether we have created the special dynamic sections required
382 when linking against or generating a shared object. */
383 bfd_boolean dynamic_sections_created;
385 /* True if this target has relocatable executables, so needs dynamic
387 bfd_boolean is_relocatable_executable;
389 /* The BFD used to hold special sections created by the linker.
390 This will be the first BFD found which requires these sections to
394 /* The value to use when initialising got.refcount/offset and
395 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
396 the values are refcounts. Set to init_got_offset/init_plt_offset
397 in size_dynamic_sections when the values may be offsets. */
398 union gotplt_union init_got_refcount;
399 union gotplt_union init_plt_refcount;
401 /* The value to use for got.refcount/offset and plt.refcount/offset
402 when the values may be offsets. Normally (bfd_vma) -1. */
403 union gotplt_union init_got_offset;
404 union gotplt_union init_plt_offset;
406 /* The number of symbols found in the link which must be put into
407 the .dynsym section. */
408 bfd_size_type dynsymcount;
410 /* The string table of dynamic symbols, which becomes the .dynstr
412 struct elf_strtab_hash *dynstr;
414 /* The number of buckets in the hash table in the .hash section.
415 This is based on the number of dynamic symbols. */
416 bfd_size_type bucketcount;
418 /* A linked list of DT_NEEDED names found in dynamic objects
419 included in the link. */
420 struct bfd_link_needed_list *needed;
422 /* Sections in the output bfd that provides a section symbol
423 to be used by relocations emitted against local symbols.
424 Most targets will not use data_index_section. */
425 asection *text_index_section;
426 asection *data_index_section;
428 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
429 struct elf_link_hash_entry *hgot;
431 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
432 struct elf_link_hash_entry *hplt;
434 /* A pointer to information used to merge SEC_MERGE sections. */
437 /* Used to link stabs in sections. */
438 struct stab_info stab_info;
440 /* Used by eh_frame code when editing .eh_frame. */
441 struct eh_frame_hdr_info eh_info;
443 /* A linked list of local symbols to be added to .dynsym. */
444 struct elf_link_local_dynamic_entry *dynlocal;
446 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
447 objects included in the link. */
448 struct bfd_link_needed_list *runpath;
450 /* Cached first output tls section and size of PT_TLS segment. */
452 bfd_size_type tls_size;
454 /* A linked list of BFD's loaded in the link. */
455 struct elf_link_loaded_list *loaded;
458 /* Look up an entry in an ELF linker hash table. */
460 #define elf_link_hash_lookup(table, string, create, copy, follow) \
461 ((struct elf_link_hash_entry *) \
462 bfd_link_hash_lookup (&(table)->root, (string), (create), \
465 /* Traverse an ELF linker hash table. */
467 #define elf_link_hash_traverse(table, func, info) \
468 (bfd_link_hash_traverse \
470 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
473 /* Get the ELF linker hash table from a link_info structure. */
475 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
477 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
478 #define is_elf_hash_table(htab) \
479 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
481 /* Used by bfd_section_from_r_symndx to cache a small number of local
482 symbol to section mappings. */
483 #define LOCAL_SYM_CACHE_SIZE 32
487 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
488 unsigned int shndx[LOCAL_SYM_CACHE_SIZE];
491 /* Constant information held for an ELF backend. */
493 struct elf_size_info {
494 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
495 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
497 /* The size of entries in the .hash section. */
498 unsigned char sizeof_hash_entry;
500 /* The number of internal relocations to allocate per external
502 unsigned char int_rels_per_ext_rel;
503 /* We use some fixed size arrays. This should be large enough to
504 handle all back-ends. */
505 #define MAX_INT_RELS_PER_EXT_REL 3
507 unsigned char arch_size, log_file_align;
508 unsigned char elfclass, ev_current;
509 int (*write_out_phdrs)
510 (bfd *, const Elf_Internal_Phdr *, unsigned int);
512 (*write_shdrs_and_ehdr) (bfd *);
513 bfd_boolean (*checksum_contents)
514 (bfd * , void (*) (const void *, size_t, void *), void *);
516 (bfd *, asection *, void *);
517 bfd_boolean (*swap_symbol_in)
518 (bfd *, const void *, const void *, Elf_Internal_Sym *);
519 void (*swap_symbol_out)
520 (bfd *, const Elf_Internal_Sym *, void *, void *);
521 bfd_boolean (*slurp_reloc_table)
522 (bfd *, asection *, asymbol **, bfd_boolean);
523 long (*slurp_symbol_table)
524 (bfd *, asymbol **, bfd_boolean);
526 (bfd *, const void *, Elf_Internal_Dyn *);
528 (bfd *, const Elf_Internal_Dyn *, void *);
530 /* This function is called to swap in a REL relocation. If an
531 external relocation corresponds to more than one internal
532 relocation, then all relocations are swapped in at once. */
533 void (*swap_reloc_in)
534 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
536 /* This function is called to swap out a REL relocation. */
537 void (*swap_reloc_out)
538 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
540 /* This function is called to swap in a RELA relocation. If an
541 external relocation corresponds to more than one internal
542 relocation, then all relocations are swapped in at once. */
543 void (*swap_reloca_in)
544 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
546 /* This function is called to swap out a RELA relocation. */
547 void (*swap_reloca_out)
548 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
551 #define elf_symbol_from(ABFD,S) \
552 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
553 && (S)->the_bfd->tdata.elf_obj_data != 0) \
554 ? (elf_symbol_type *) (S) \
557 enum elf_reloc_type_class {
559 reloc_class_relative,
564 struct elf_reloc_cookie
566 Elf_Internal_Rela *rels, *rel, *relend;
567 Elf_Internal_Sym *locsyms;
571 struct elf_link_hash_entry **sym_hashes;
573 bfd_boolean bad_symtab;
576 /* The level of IRIX compatibility we're striving for. */
584 /* Mapping of ELF section names and types. */
585 struct bfd_elf_special_section
589 /* 0 means name must match PREFIX exactly.
590 -1 means name must start with PREFIX followed by an arbitrary string.
591 -2 means name must match PREFIX exactly or consist of PREFIX followed
592 by a dot then anything.
593 > 0 means name must start with the first PREFIX_LENGTH chars of
594 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
600 enum action_discarded
606 typedef asection * (*elf_gc_mark_hook_fn)
607 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
608 struct elf_link_hash_entry *, Elf_Internal_Sym *);
610 struct elf_backend_data
612 /* The architecture for this backend. */
613 enum bfd_architecture arch;
615 /* The ELF machine code (EM_xxxx) for this backend. */
616 int elf_machine_code;
621 /* The maximum page size for this backend. */
624 /* The minimum page size for this backend. An input object will not be
625 considered page aligned unless its sections are correctly aligned for
626 pages at least this large. May be smaller than maxpagesize. */
629 /* The common page size for this backend. */
630 bfd_vma commonpagesize;
632 /* The BFD flags applied to sections created for dynamic linking. */
633 flagword dynamic_sec_flags;
635 /* A function to translate an ELF RELA relocation to a BFD arelent
637 void (*elf_info_to_howto)
638 (bfd *, arelent *, Elf_Internal_Rela *);
640 /* A function to translate an ELF REL relocation to a BFD arelent
642 void (*elf_info_to_howto_rel)
643 (bfd *, arelent *, Elf_Internal_Rela *);
645 /* A function to determine whether a symbol is global when
646 partitioning the symbol table into local and global symbols.
647 This should be NULL for most targets, in which case the correct
648 thing will be done. MIPS ELF, at least on the Irix 5, has
649 special requirements. */
650 bfd_boolean (*elf_backend_sym_is_global)
653 /* The remaining functions are hooks which are called only if they
656 /* A function to permit a backend specific check on whether a
657 particular BFD format is relevant for an object file, and to
658 permit the backend to set any global information it wishes. When
659 this is called elf_elfheader is set, but anything else should be
660 used with caution. If this returns FALSE, the check_format
661 routine will return a bfd_error_wrong_format error. */
662 bfd_boolean (*elf_backend_object_p)
665 /* A function to do additional symbol processing when reading the
666 ELF symbol table. This is where any processor-specific special
667 section indices are handled. */
668 void (*elf_backend_symbol_processing)
671 /* A function to do additional symbol processing after reading the
672 entire ELF symbol table. */
673 bfd_boolean (*elf_backend_symbol_table_processing)
674 (bfd *, elf_symbol_type *, unsigned int);
676 /* A function to set the type of the info field. Processor-specific
677 types should be handled here. */
678 int (*elf_backend_get_symbol_type)
679 (Elf_Internal_Sym *, int);
681 /* A function to return the linker hash table entry of a symbol that
682 might be satisfied by an archive symbol. */
683 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
684 (bfd *, struct bfd_link_info *, const char *);
686 /* Return true if local section symbols should have a non-null st_name.
687 NULL implies false. */
688 bfd_boolean (*elf_backend_name_local_section_symbols)
691 /* A function to do additional processing on the ELF section header
692 just before writing it out. This is used to set the flags and
693 type fields for some sections, or to actually write out data for
695 bfd_boolean (*elf_backend_section_processing)
696 (bfd *, Elf_Internal_Shdr *);
698 /* A function to handle unusual section types when creating BFD
699 sections from ELF sections. */
700 bfd_boolean (*elf_backend_section_from_shdr)
701 (bfd *, Elf_Internal_Shdr *, const char *, int);
703 /* A function to convert machine dependent ELF section header flags to
704 BFD internal section header flags. */
705 bfd_boolean (*elf_backend_section_flags)
706 (flagword *, const Elf_Internal_Shdr *);
708 /* A function that returns a struct containing ELF section flags and
709 type for the given BFD section. */
710 const struct bfd_elf_special_section * (*get_sec_type_attr)
713 /* A function to handle unusual program segment types when creating BFD
714 sections from ELF program segments. */
715 bfd_boolean (*elf_backend_section_from_phdr)
716 (bfd *, Elf_Internal_Phdr *, int, const char *);
718 /* A function to set up the ELF section header for a BFD section in
719 preparation for writing it out. This is where the flags and type
720 fields are set for unusual sections. */
721 bfd_boolean (*elf_backend_fake_sections)
722 (bfd *, Elf_Internal_Shdr *, asection *);
724 /* A function to get the ELF section index for a BFD section. If
725 this returns TRUE, the section was found. If it is a normal ELF
726 section, *RETVAL should be left unchanged. If it is not a normal
727 ELF section *RETVAL should be set to the SHN_xxxx index. */
728 bfd_boolean (*elf_backend_section_from_bfd_section)
729 (bfd *, asection *, int *retval);
731 /* If this field is not NULL, it is called by the add_symbols phase
732 of a link just before adding a symbol to the global linker hash
733 table. It may modify any of the fields as it wishes. If *NAME
734 is set to NULL, the symbol will be skipped rather than being
735 added to the hash table. This function is responsible for
736 handling all processor dependent symbol bindings and section
737 indices, and must set at least *FLAGS and *SEC for each processor
738 dependent case; failure to do so will cause a link error. */
739 bfd_boolean (*elf_add_symbol_hook)
740 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
741 const char **name, flagword *flags, asection **sec, bfd_vma *value);
743 /* If this field is not NULL, it is called by the elf_link_output_sym
744 phase of a link for each symbol which will appear in the object file. */
745 bfd_boolean (*elf_backend_link_output_symbol_hook)
746 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
747 asection *, struct elf_link_hash_entry *);
749 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
750 linker the first time it encounters a dynamic object in the link.
751 This function must create any sections required for dynamic
752 linking. The ABFD argument is a dynamic object. The .interp,
753 .dynamic, .dynsym, .dynstr, and .hash functions have already been
754 created, and this function may modify the section flags if
755 desired. This function will normally create the .got and .plt
756 sections, but different backends have different requirements. */
757 bfd_boolean (*elf_backend_create_dynamic_sections)
758 (bfd *abfd, struct bfd_link_info *info);
760 /* When creating a shared library, determine whether to omit the
761 dynamic symbol for the section. */
762 bfd_boolean (*elf_backend_omit_section_dynsym)
763 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
765 /* Return TRUE if relocations of targets are compatible to the extent
766 that CHECK_RELOCS will properly process them. PR 4424. */
767 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
769 /* The CHECK_RELOCS function is called by the add_symbols phase of
770 the ELF backend linker. It is called once for each section with
771 relocs of an object file, just after the symbols for the object
772 file have been added to the global linker hash table. The
773 function must look through the relocs and do any special handling
774 required. This generally means allocating space in the global
775 offset table, and perhaps allocating space for a reloc. The
776 relocs are always passed as Rela structures; if the section
777 actually uses Rel structures, the r_addend field will always be
779 bfd_boolean (*check_relocs)
780 (bfd *abfd, struct bfd_link_info *info, asection *o,
781 const Elf_Internal_Rela *relocs);
783 /* The CHECK_DIRECTIVES function is called once per input file by
784 the add_symbols phase of the ELF backend linker. The function
785 must inspect the bfd and create any additional symbols according
786 to any custom directives in the bfd. */
787 bfd_boolean (*check_directives)
788 (bfd *abfd, struct bfd_link_info *info);
790 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
791 input file that was not needed by the add_symbols phase of the
792 ELF backend linker. The function must undo any target specific
793 changes in the symbol hash table. */
794 bfd_boolean (*as_needed_cleanup)
795 (bfd *abfd, struct bfd_link_info *info);
797 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
798 linker for every symbol which is defined by a dynamic object and
799 referenced by a regular object. This is called after all the
800 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
801 function has been called. The hash table entry should be
802 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
803 defined in a section from a dynamic object. Dynamic object
804 sections are not included in the final link, and this function is
805 responsible for changing the value to something which the rest of
806 the link can deal with. This will normally involve adding an
807 entry to the .plt or .got or some such section, and setting the
808 symbol to point to that. */
809 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
810 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
812 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
813 after all the linker input files have been seen but before the
814 section sizes have been set. This is called after
815 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
816 bfd_boolean (*elf_backend_always_size_sections)
817 (bfd *output_bfd, struct bfd_link_info *info);
819 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
820 linker after all the linker input files have been seen but before
821 the sections sizes have been set. This is called after
822 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
823 It is only called when linking against a dynamic object. It must
824 set the sizes of the dynamic sections, and may fill in their
825 contents as well. The generic ELF linker can handle the .dynsym,
826 .dynstr and .hash sections. This function must handle the
827 .interp section and any sections created by the
828 CREATE_DYNAMIC_SECTIONS entry point. */
829 bfd_boolean (*elf_backend_size_dynamic_sections)
830 (bfd *output_bfd, struct bfd_link_info *info);
832 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
833 we keep to use as a base for relocs and symbols. */
834 void (*elf_backend_init_index_section)
835 (bfd *output_bfd, struct bfd_link_info *info);
837 /* The RELOCATE_SECTION function is called by the ELF backend linker
838 to handle the relocations for a section.
840 The relocs are always passed as Rela structures; if the section
841 actually uses Rel structures, the r_addend field will always be
844 This function is responsible for adjust the section contents as
845 necessary, and (if using Rela relocs and generating a
846 relocatable output file) adjusting the reloc addend as
849 This function does not have to worry about setting the reloc
850 address or the reloc symbol index.
852 LOCAL_SYMS is a pointer to the swapped in local symbols.
854 LOCAL_SECTIONS is an array giving the section in the input file
855 corresponding to the st_shndx field of each local symbol.
857 The global hash table entry for the global symbols can be found
858 via elf_sym_hashes (input_bfd).
860 When generating relocatable output, this function must handle
861 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
862 going to be the section symbol corresponding to the output
863 section, which means that the addend must be adjusted
866 Returns FALSE on error, TRUE on success, 2 if successful and
867 relocations should be written for this section. */
868 int (*elf_backend_relocate_section)
869 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
870 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
871 Elf_Internal_Sym *local_syms, asection **local_sections);
873 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
874 linker just before it writes a symbol out to the .dynsym section.
875 The processor backend may make any required adjustment to the
876 symbol. It may also take the opportunity to set contents of the
877 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
878 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
879 on those symbols which are defined by a dynamic object. */
880 bfd_boolean (*elf_backend_finish_dynamic_symbol)
881 (bfd *output_bfd, struct bfd_link_info *info,
882 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
884 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
885 linker just before it writes all the dynamic sections out to the
886 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
887 all dynamic symbols. */
888 bfd_boolean (*elf_backend_finish_dynamic_sections)
889 (bfd *output_bfd, struct bfd_link_info *info);
891 /* A function to do any beginning processing needed for the ELF file
892 before building the ELF headers and computing file positions. */
893 void (*elf_backend_begin_write_processing)
894 (bfd *, struct bfd_link_info *);
896 /* A function to do any final processing needed for the ELF file
897 before writing it out. The LINKER argument is TRUE if this BFD
898 was created by the ELF backend linker. */
899 void (*elf_backend_final_write_processing)
900 (bfd *, bfd_boolean linker);
902 /* This function is called by get_program_header_size. It should
903 return the number of additional program segments which this BFD
904 will need. It should return -1 on error. */
905 int (*elf_backend_additional_program_headers)
906 (bfd *, struct bfd_link_info *);
908 /* This function is called to modify an existing segment map in a
909 backend specific fashion. */
910 bfd_boolean (*elf_backend_modify_segment_map)
911 (bfd *, struct bfd_link_info *);
913 /* This function is called to modify program headers just before
915 bfd_boolean (*elf_backend_modify_program_headers)
916 (bfd *, struct bfd_link_info *);
918 /* This function is called before section garbage collection to
919 mark entry symbol sections. */
921 (struct bfd_link_info *);
923 /* This function is called during section garbage collection to
924 mark sections that define global symbols. */
925 bfd_boolean (*gc_mark_dynamic_ref)
926 (struct elf_link_hash_entry *, void *);
928 /* This function is called during section gc to discover the section a
929 particular relocation refers to. */
930 elf_gc_mark_hook_fn gc_mark_hook;
932 /* This function, if defined, is called after the first gc marking pass
933 to allow the backend to mark additional sections. */
934 bfd_boolean (*gc_mark_extra_sections)
935 (struct bfd_link_info *, elf_gc_mark_hook_fn);
937 /* This function, if defined, is called during the sweep phase of gc
938 in order that a backend might update any data structures it might
940 bfd_boolean (*gc_sweep_hook)
941 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
943 /* This function, if defined, is called after the ELF headers have
944 been created. This allows for things like the OS and ABI versions
946 void (*elf_backend_post_process_headers)
947 (bfd *, struct bfd_link_info *);
949 /* This function, if defined, prints a symbol to file and returns the
950 name of the symbol to be printed. It should return NULL to fall
951 back to default symbol printing. */
952 const char *(*elf_backend_print_symbol_all)
953 (bfd *, void *, asymbol *);
955 /* This function, if defined, is called after all local symbols and
956 global symbols converted to locals are emitted into the symtab
957 section. It allows the backend to emit special local symbols
958 not handled in the hash table. */
959 bfd_boolean (*elf_backend_output_arch_local_syms)
960 (bfd *, struct bfd_link_info *, void *,
961 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
962 struct elf_link_hash_entry *));
964 /* This function, if defined, is called after all symbols are emitted
965 into the symtab section. It allows the backend to emit special
966 global symbols not handled in the hash table. */
967 bfd_boolean (*elf_backend_output_arch_syms)
968 (bfd *, struct bfd_link_info *, void *,
969 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
970 struct elf_link_hash_entry *));
972 /* Copy any information related to dynamic linking from a pre-existing
973 symbol to a newly created symbol. Also called to copy flags and
974 other back-end info to a weakdef, in which case the symbol is not
975 newly created and plt/got refcounts and dynamic indices should not
977 void (*elf_backend_copy_indirect_symbol)
978 (struct bfd_link_info *, struct elf_link_hash_entry *,
979 struct elf_link_hash_entry *);
981 /* Modify any information related to dynamic linking such that the
982 symbol is not exported. */
983 void (*elf_backend_hide_symbol)
984 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
986 /* A function to do additional symbol fixup, called by
987 _bfd_elf_fix_symbol_flags. */
988 bfd_boolean (*elf_backend_fixup_symbol)
989 (struct bfd_link_info *, struct elf_link_hash_entry *);
991 /* Merge the backend specific symbol attribute. */
992 void (*elf_backend_merge_symbol_attribute)
993 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
996 /* This function, if defined, will return a string containing the
997 name of a target-specific dynamic tag. */
998 char *(*elf_backend_get_target_dtag)
1001 /* Decide whether an undefined symbol is special and can be ignored.
1002 This is the case for OPTIONAL symbols on IRIX. */
1003 bfd_boolean (*elf_backend_ignore_undef_symbol)
1004 (struct elf_link_hash_entry *);
1006 /* Emit relocations. Overrides default routine for emitting relocs,
1007 except during a relocatable link, or if all relocs are being emitted. */
1008 bfd_boolean (*elf_backend_emit_relocs)
1009 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1010 struct elf_link_hash_entry **);
1012 /* Count relocations. Not called for relocatable links
1013 or if all relocs are being preserved in the output. */
1014 unsigned int (*elf_backend_count_relocs)
1015 (struct bfd_link_info *, asection *);
1017 /* This function, if defined, is called when an NT_PRSTATUS note is found
1019 bfd_boolean (*elf_backend_grok_prstatus)
1020 (bfd *, Elf_Internal_Note *);
1022 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1023 note is found in a core file. */
1024 bfd_boolean (*elf_backend_grok_psinfo)
1025 (bfd *, Elf_Internal_Note *);
1027 /* This function, if defined, is called to write a note to a corefile. */
1028 char *(*elf_backend_write_core_note)
1029 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1031 /* This function returns class of a reloc type. */
1032 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1033 (const Elf_Internal_Rela *);
1035 /* This function, if defined, removes information about discarded functions
1036 from other sections which mention them. */
1037 bfd_boolean (*elf_backend_discard_info)
1038 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1040 /* This function, if defined, signals that the function above has removed
1041 the discarded relocations for this section. */
1042 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1045 /* What to do when ld finds relocations against symbols defined in
1046 discarded sections. */
1047 unsigned int (*action_discarded)
1050 /* This function returns the width of FDE pointers in bytes, or 0 if
1051 that can't be determined for some reason. The default definition
1052 goes by the bfd's EI_CLASS. */
1053 unsigned int (*elf_backend_eh_frame_address_size)
1054 (bfd *, asection *);
1056 /* These functions tell elf-eh-frame whether to attempt to turn
1057 absolute or lsda encodings into pc-relative ones. The default
1058 definition enables these transformations. */
1059 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1060 (bfd *, struct bfd_link_info *, asection *);
1061 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1062 (bfd *, struct bfd_link_info *, asection *);
1064 /* This function returns an encoding after computing the encoded
1065 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1066 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1067 The default definition chooses a 32-bit PC-relative encoding. */
1068 bfd_byte (*elf_backend_encode_eh_address)
1069 (bfd *abfd, struct bfd_link_info *info,
1070 asection *osec, bfd_vma offset,
1071 asection *loc_sec, bfd_vma loc_offset,
1074 /* This function, if defined, may write out the given section.
1075 Returns TRUE if it did so and FALSE if the caller should. */
1076 bfd_boolean (*elf_backend_write_section)
1077 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1079 /* The level of IRIX compatibility we're striving for.
1080 MIPS ELF specific function. */
1081 irix_compat_t (*elf_backend_mips_irix_compat)
1084 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1085 (unsigned int, bfd_boolean);
1087 /* The swapping table to use when dealing with ECOFF information.
1088 Used for the MIPS ELF .mdebug section. */
1089 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1091 /* This function implements `bfd_elf_bfd_from_remote_memory';
1092 see elf.c, elfcode.h. */
1093 bfd *(*elf_backend_bfd_from_remote_memory)
1094 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1095 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1097 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1099 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1101 /* Is symbol defined in common section? */
1102 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1104 /* Return a common section index for section. */
1105 unsigned int (*common_section_index) (asection *);
1107 /* Return a common section for section. */
1108 asection *(*common_section) (asection *);
1110 /* Return TRUE if we can merge 2 definitions. */
1111 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1112 struct elf_link_hash_entry **,
1113 struct elf_link_hash_entry *,
1114 Elf_Internal_Sym *, asection **,
1115 bfd_vma *, unsigned int *,
1116 bfd_boolean *, bfd_boolean *,
1117 bfd_boolean *, bfd_boolean *,
1118 bfd_boolean *, bfd_boolean *,
1119 bfd_boolean *, bfd_boolean *,
1121 bfd_boolean *, bfd_boolean *,
1122 bfd_boolean *, bfd_boolean *,
1123 bfd *, asection **);
1125 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1126 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1128 /* Return TRUE if type is a function symbol type. */
1129 bfd_boolean (*is_function_type) (unsigned int type);
1131 /* Used to handle bad SHF_LINK_ORDER input. */
1132 bfd_error_handler_type link_order_error_handler;
1134 /* Name of the PLT relocation section. */
1135 const char *relplt_name;
1137 /* Alternate EM_xxxx machine codes for this backend. */
1138 int elf_machine_alt1;
1139 int elf_machine_alt2;
1141 const struct elf_size_info *s;
1143 /* An array of target specific special sections. */
1144 const struct bfd_elf_special_section *special_sections;
1146 /* The size in bytes of the header for the GOT. This includes the
1147 so-called reserved entries on some systems. */
1148 bfd_vma got_header_size;
1150 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1151 otherwise by the local symbol with index SYMNDX in IBFD. */
1152 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1153 struct elf_link_hash_entry *h,
1154 bfd *ibfd, unsigned long symndx);
1156 /* The vendor name to use for a processor-standard attributes section. */
1157 const char *obj_attrs_vendor;
1159 /* The section name to use for a processor-standard attributes section. */
1160 const char *obj_attrs_section;
1162 /* Return 1, 2 or 3 to indicate what type of arguments a
1163 processor-specific tag takes. */
1164 int (*obj_attrs_arg_type) (int);
1166 /* The section type to use for an attributes section. */
1167 unsigned int obj_attrs_section_type;
1169 /* This is TRUE if the linker should act like collect and gather
1170 global constructors and destructors by name. This is TRUE for
1171 MIPS ELF because the Irix 5 tools can not handle the .init
1173 unsigned collect : 1;
1175 /* This is TRUE if the linker should ignore changes to the type of a
1176 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1177 record undefined functions as STT_OBJECT although the definitions
1179 unsigned type_change_ok : 1;
1181 /* Whether the backend may use REL relocations. (Some backends use
1182 both REL and RELA relocations, and this flag is set for those
1184 unsigned may_use_rel_p : 1;
1186 /* Whether the backend may use RELA relocations. (Some backends use
1187 both REL and RELA relocations, and this flag is set for those
1189 unsigned may_use_rela_p : 1;
1191 /* Whether the default relocation type is RELA. If a backend with
1192 this flag set wants REL relocations for a particular section,
1193 it must note that explicitly. Similarly, if this flag is clear,
1194 and the backend wants RELA relocations for a particular
1196 unsigned default_use_rela_p : 1;
1198 /* True if PLT and copy relocations should be RELA by default. */
1199 unsigned rela_plts_and_copies_p : 1;
1201 /* Set if RELA relocations for a relocatable link can be handled by
1202 generic code. Backends that set this flag need do nothing in the
1203 backend relocate_section routine for relocatable linking. */
1204 unsigned rela_normal : 1;
1206 /* TRUE if addresses "naturally" sign extend. This is used when
1207 swapping in from Elf32 when BFD64. */
1208 unsigned sign_extend_vma : 1;
1210 unsigned want_got_plt : 1;
1211 unsigned plt_readonly : 1;
1212 unsigned want_plt_sym : 1;
1213 unsigned plt_not_loaded : 1;
1214 unsigned plt_alignment : 4;
1215 unsigned can_gc_sections : 1;
1216 unsigned can_refcount : 1;
1217 unsigned want_got_sym : 1;
1218 unsigned want_dynbss : 1;
1220 /* Targets which do not support physical addressing often require
1221 that the p_paddr field in the section header to be set to zero.
1222 This field indicates whether this behavior is required. */
1223 unsigned want_p_paddr_set_to_zero : 1;
1225 /* True if an object file lacking a .note.GNU-stack section
1226 should be assumed to be requesting exec stack. At least one
1227 other file in the link needs to have a .note.GNU-stack section
1228 for a PT_GNU_STACK segment to be created. */
1229 unsigned default_execstack : 1;
1232 /* Information stored for each BFD section in an ELF file. This
1233 structure is allocated by elf_new_section_hook. */
1235 struct bfd_elf_section_data
1237 /* The ELF header for this section. */
1238 Elf_Internal_Shdr this_hdr;
1240 /* The ELF header for the reloc section associated with this
1242 Elf_Internal_Shdr rel_hdr;
1244 /* If there is a second reloc section associated with this section,
1245 as can happen on Irix 6, this field points to the header. */
1246 Elf_Internal_Shdr *rel_hdr2;
1248 /* The number of relocations currently assigned to REL_HDR. */
1249 unsigned int rel_count;
1251 /* The number of relocations currently assigned to REL_HDR2. */
1252 unsigned int rel_count2;
1254 /* The ELF section number of this section. */
1257 /* The ELF section number of the reloc section indicated by
1258 REL_HDR if any. Only used for an output file. */
1261 /* The ELF section number of the reloc section indicated by
1262 REL_HDR2 if any. Only used for an output file. */
1265 /* Used by the backend linker when generating a shared library to
1266 record the dynamic symbol index for a section symbol
1267 corresponding to this section. A value of 0 means that there is
1268 no dynamic symbol for this section. */
1271 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1272 asection *linked_to;
1274 /* Used by the backend linker to store the symbol hash table entries
1275 associated with relocs against global symbols. */
1276 struct elf_link_hash_entry **rel_hashes;
1278 /* A pointer to the swapped relocs. If the section uses REL relocs,
1279 rather than RELA, all the r_addend fields will be zero. This
1280 pointer may be NULL. It is used by the backend linker. */
1281 Elf_Internal_Rela *relocs;
1283 /* A pointer to a linked list tracking dynamic relocs copied for
1287 /* A pointer to the bfd section used for dynamic relocs. */
1291 /* Group name, if this section is a member of a group. */
1294 /* Group signature sym, if this is the SHT_GROUP section. */
1295 struct bfd_symbol *id;
1298 /* For a member of a group, points to the SHT_GROUP section.
1299 NULL for the SHT_GROUP section itself and non-group sections. */
1300 asection *sec_group;
1302 /* A linked list of member sections in the group. Circular when used by
1303 the linker. For the SHT_GROUP section, points at first member. */
1304 asection *next_in_group;
1306 /* The FDEs associated with this section. The u.fde.next_in_section
1307 field acts as a chain pointer. */
1308 struct eh_cie_fde *fde_list;
1310 /* A pointer used for various section optimizations. */
1314 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1315 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1316 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1317 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1318 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1319 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1320 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1321 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1322 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1324 #define xvec_get_elf_backend_data(xvec) \
1325 ((const struct elf_backend_data *) (xvec)->backend_data)
1327 #define get_elf_backend_data(abfd) \
1328 xvec_get_elf_backend_data ((abfd)->xvec)
1330 /* This struct is used to pass information to routines called via
1331 elf_link_hash_traverse which must return failure. */
1333 struct elf_info_failed
1336 struct bfd_link_info *info;
1337 struct bfd_elf_version_tree *verdefs;
1340 /* This structure is used to pass information to
1341 _bfd_elf_link_assign_sym_version. */
1343 struct elf_assign_sym_version_info
1347 /* General link information. */
1348 struct bfd_link_info *info;
1350 struct bfd_elf_version_tree *verdefs;
1351 /* Whether we had a failure. */
1355 /* This structure is used to pass information to
1356 _bfd_elf_link_find_version_dependencies. */
1358 struct elf_find_verdep_info
1362 /* General link information. */
1363 struct bfd_link_info *info;
1364 /* The number of dependencies. */
1366 /* Whether we had a failure. */
1370 /* The maximum number of known object attributes for any target. */
1371 #define NUM_KNOWN_OBJ_ATTRIBUTES 32
1373 /* The value of an object attribute. type & 1 indicates whether there
1374 is an integer value; type & 2 indicates whether there is a string
1377 typedef struct obj_attribute
1384 typedef struct obj_attribute_list
1386 struct obj_attribute_list *next;
1389 } obj_attribute_list;
1391 /* Object attributes may either be defined by the processor ABI, index
1392 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1393 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1394 #define OBJ_ATTR_PROC 0
1395 #define OBJ_ATTR_GNU 1
1396 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1397 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1399 /* The following object attribute tags are taken as generic, for all
1400 targets and for "gnu" where there is no target standard. */
1407 Tag_compatibility = 32
1410 /* Enum used to identify target specific extensions to the elf_obj_tdata
1411 structure. Note the enums deliberately start from 1 so that we can
1412 detect an uninitialized field. The generic value is last so that
1413 additions to this enum do not need to modify more than one line. */
1416 ALPHA_ELF_TDATA = 1,
1431 /* Some private data is stashed away for future use using the tdata pointer
1432 in the bfd structure. */
1434 struct elf_obj_tdata
1436 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1437 Elf_Internal_Shdr **elf_sect_ptr;
1438 Elf_Internal_Phdr *phdr;
1439 struct elf_segment_map *segment_map;
1440 struct elf_strtab_hash *strtab_ptr;
1443 unsigned int num_elf_sections; /* elf_sect_ptr size */
1444 int num_section_syms;
1445 asymbol **section_syms; /* STT_SECTION symbols for each section */
1446 Elf_Internal_Shdr symtab_hdr;
1447 Elf_Internal_Shdr shstrtab_hdr;
1448 Elf_Internal_Shdr strtab_hdr;
1449 Elf_Internal_Shdr dynsymtab_hdr;
1450 Elf_Internal_Shdr dynstrtab_hdr;
1451 Elf_Internal_Shdr dynversym_hdr;
1452 Elf_Internal_Shdr dynverref_hdr;
1453 Elf_Internal_Shdr dynverdef_hdr;
1454 Elf_Internal_Shdr symtab_shndx_hdr;
1455 unsigned int symtab_section, shstrtab_section;
1456 unsigned int strtab_section, dynsymtab_section;
1457 unsigned int symtab_shndx_section;
1458 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1459 file_ptr next_file_pos;
1460 bfd_vma gp; /* The gp value */
1461 unsigned int gp_size; /* The gp size */
1463 /* Information grabbed from an elf core file. */
1470 /* A mapping from external symbols to entries in the linker hash
1471 table, used when linking. This is indexed by the symbol index
1472 minus the sh_info field of the symbol table header. */
1473 struct elf_link_hash_entry **sym_hashes;
1475 /* Track usage and final offsets of GOT entries for local symbols.
1476 This array is indexed by symbol index. Elements are used
1477 identically to "got" in struct elf_link_hash_entry. */
1480 bfd_signed_vma *refcounts;
1482 struct got_entry **ents;
1485 /* The linker ELF emulation code needs to let the backend ELF linker
1486 know what filename should be used for a dynamic object if the
1487 dynamic object is found using a search. The emulation code then
1488 sometimes needs to know what name was actually used. Until the
1489 file has been added to the linker symbol table, this field holds
1490 the name the linker wants. After it has been added, it holds the
1491 name actually used, which will be the DT_SONAME entry if there is
1493 const char *dt_name;
1495 /* Records the result of `get_program_header_size'. */
1496 bfd_size_type program_header_size;
1498 /* Used by find_nearest_line entry point. */
1501 /* Used by MIPS ELF find_nearest_line entry point. The structure
1502 could be included directly in this one, but there's no point to
1503 wasting the memory just for the infrequently called
1504 find_nearest_line. */
1505 struct mips_elf_find_line *find_line_info;
1507 /* A place to stash dwarf1 info for this bfd. */
1508 struct dwarf1_debug *dwarf1_find_line_info;
1510 /* A place to stash dwarf2 info for this bfd. */
1511 void *dwarf2_find_line_info;
1513 /* An array of stub sections indexed by symbol number, used by the
1514 MIPS ELF linker. FIXME: We should figure out some way to only
1515 include this field for a MIPS ELF target. */
1516 asection **local_stubs;
1517 asection **local_call_stubs;
1519 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1521 asection *eh_frame_hdr;
1523 Elf_Internal_Shdr **group_sect_ptr;
1526 /* Number of symbol version definitions we are about to emit. */
1527 unsigned int cverdefs;
1529 /* Number of symbol version references we are about to emit. */
1530 unsigned int cverrefs;
1532 /* Segment flags for the PT_GNU_STACK segment. */
1533 unsigned int stack_flags;
1535 /* Symbol version definitions in external objects. */
1536 Elf_Internal_Verdef *verdef;
1538 /* Symbol version references to external objects. */
1539 Elf_Internal_Verneed *verref;
1541 /* The Irix 5 support uses two virtual sections, which represent
1542 text/data symbols defined in dynamic objects. */
1543 asymbol *elf_data_symbol;
1544 asymbol *elf_text_symbol;
1545 asection *elf_data_section;
1546 asection *elf_text_section;
1548 /* A pointer to the .eh_frame section. */
1549 asection *eh_frame_section;
1551 /* Whether a dyanmic object was specified normally on the linker
1552 command line, or was specified when --as-needed was in effect,
1553 or was found via a DT_NEEDED entry. */
1554 enum dynamic_lib_link_class dyn_lib_class;
1556 /* This is set to TRUE if the object was created by the backend
1560 /* Irix 5 often screws up the symbol table, sorting local symbols
1561 after global symbols. This flag is set if the symbol table in
1562 this BFD appears to be screwed up. If it is, we ignore the
1563 sh_info field in the symbol table header, and always read all the
1565 bfd_boolean bad_symtab;
1567 /* Used to determine if the e_flags field has been initialized */
1568 bfd_boolean flags_init;
1570 /* Symbol buffer. */
1573 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1574 obj_attribute_list *other_obj_attributes[2];
1576 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1577 bfd_boolean (*after_write_object_contents) (bfd *);
1578 void *after_write_object_contents_info;
1580 /* NT_GNU_BUILD_ID note type. */
1581 bfd_size_type build_id_size;
1584 /* An identifier used to distinguish different target
1585 specific extensions to this structure. */
1586 enum elf_object_id object_id;
1589 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1591 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1592 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1593 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1594 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1595 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1596 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1597 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1598 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1599 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1600 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1601 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1602 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1603 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1604 #define elf_eh_frame_section(bfd) \
1605 (elf_tdata(bfd) -> eh_frame_section)
1606 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1607 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1608 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1609 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1610 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1611 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1612 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1613 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1614 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1615 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1616 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1617 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1618 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1619 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1620 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1621 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1622 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1623 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1624 #define elf_known_obj_attributes_proc(bfd) \
1625 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1626 #define elf_other_obj_attributes_proc(bfd) \
1627 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1629 extern void _bfd_elf_swap_verdef_in
1630 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1631 extern void _bfd_elf_swap_verdef_out
1632 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1633 extern void _bfd_elf_swap_verdaux_in
1634 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1635 extern void _bfd_elf_swap_verdaux_out
1636 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1637 extern void _bfd_elf_swap_verneed_in
1638 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1639 extern void _bfd_elf_swap_verneed_out
1640 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1641 extern void _bfd_elf_swap_vernaux_in
1642 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1643 extern void _bfd_elf_swap_vernaux_out
1644 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1645 extern void _bfd_elf_swap_versym_in
1646 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1647 extern void _bfd_elf_swap_versym_out
1648 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1650 extern unsigned int _bfd_elf_section_from_bfd_section
1651 (bfd *, asection *);
1652 extern char *bfd_elf_string_from_elf_section
1653 (bfd *, unsigned, unsigned);
1654 extern char *bfd_elf_get_str_section
1656 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1657 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1658 Elf_External_Sym_Shndx *);
1659 extern const char *bfd_elf_sym_name
1660 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1662 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1664 extern bfd_boolean _bfd_elf_print_private_bfd_data
1666 extern void bfd_elf_print_symbol
1667 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1669 extern unsigned int _bfd_elf_eh_frame_address_size
1670 (bfd *, asection *);
1671 extern bfd_byte _bfd_elf_encode_eh_address
1672 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1673 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1674 extern bfd_boolean _bfd_elf_can_make_relative
1675 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1677 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1678 (const Elf_Internal_Rela *);
1679 extern bfd_vma _bfd_elf_rela_local_sym
1680 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1681 extern bfd_vma _bfd_elf_rel_local_sym
1682 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1683 extern bfd_vma _bfd_elf_section_offset
1684 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1686 extern unsigned long bfd_elf_hash
1688 extern unsigned long bfd_elf_gnu_hash
1691 extern bfd_reloc_status_type bfd_elf_generic_reloc
1692 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1693 extern bfd_boolean bfd_elf_allocate_object
1694 (bfd *, size_t, enum elf_object_id);
1695 extern bfd_boolean bfd_elf_make_generic_object
1697 extern bfd_boolean bfd_elf_mkcorefile
1699 extern Elf_Internal_Shdr *bfd_elf_find_section
1701 extern bfd_boolean _bfd_elf_make_section_from_shdr
1702 (bfd *, Elf_Internal_Shdr *, const char *, int);
1703 extern bfd_boolean _bfd_elf_make_section_from_phdr
1704 (bfd *, Elf_Internal_Phdr *, int, const char *);
1705 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1706 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1707 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1709 extern void _bfd_elf_link_hash_copy_indirect
1710 (struct bfd_link_info *, struct elf_link_hash_entry *,
1711 struct elf_link_hash_entry *);
1712 extern void _bfd_elf_link_hash_hide_symbol
1713 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1714 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1715 (struct bfd_link_info *, struct elf_link_hash_entry *);
1716 extern bfd_boolean _bfd_elf_link_hash_table_init
1717 (struct elf_link_hash_table *, bfd *,
1718 struct bfd_hash_entry *(*)
1719 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1721 extern bfd_boolean _bfd_elf_slurp_version_tables
1722 (bfd *, bfd_boolean);
1723 extern bfd_boolean _bfd_elf_merge_sections
1724 (bfd *, struct bfd_link_info *);
1725 extern bfd_boolean _bfd_elf_match_sections_by_type
1726 (bfd *, const asection *, bfd *, const asection *);
1727 extern bfd_boolean bfd_elf_is_group_section
1728 (bfd *, const struct bfd_section *);
1729 extern void _bfd_elf_section_already_linked
1730 (bfd *, struct bfd_section *, struct bfd_link_info *);
1731 extern void bfd_elf_set_group_contents
1732 (bfd *, asection *, void *);
1733 extern asection *_bfd_elf_check_kept_section
1734 (asection *, struct bfd_link_info *);
1735 extern void _bfd_elf_link_just_syms
1736 (asection *, struct bfd_link_info *);
1737 extern bfd_boolean _bfd_elf_copy_private_header_data
1739 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1740 (bfd *, asymbol *, bfd *, asymbol *);
1741 #define _bfd_generic_init_private_section_data \
1742 _bfd_elf_init_private_section_data
1743 extern bfd_boolean _bfd_elf_init_private_section_data
1744 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1745 extern bfd_boolean _bfd_elf_copy_private_section_data
1746 (bfd *, asection *, bfd *, asection *);
1747 extern bfd_boolean _bfd_elf_write_object_contents
1749 extern bfd_boolean _bfd_elf_write_corefile_contents
1751 extern bfd_boolean _bfd_elf_set_section_contents
1752 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1753 extern long _bfd_elf_get_symtab_upper_bound
1755 extern long _bfd_elf_canonicalize_symtab
1756 (bfd *, asymbol **);
1757 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1759 extern long _bfd_elf_canonicalize_dynamic_symtab
1760 (bfd *, asymbol **);
1761 extern long _bfd_elf_get_synthetic_symtab
1762 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1763 extern long _bfd_elf_get_reloc_upper_bound
1765 extern long _bfd_elf_canonicalize_reloc
1766 (bfd *, sec_ptr, arelent **, asymbol **);
1767 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1769 extern long _bfd_elf_canonicalize_dynamic_reloc
1770 (bfd *, arelent **, asymbol **);
1771 extern asymbol *_bfd_elf_make_empty_symbol
1773 extern void _bfd_elf_get_symbol_info
1774 (bfd *, asymbol *, symbol_info *);
1775 extern bfd_boolean _bfd_elf_is_local_label_name
1776 (bfd *, const char *);
1777 extern alent *_bfd_elf_get_lineno
1779 extern bfd_boolean _bfd_elf_set_arch_mach
1780 (bfd *, enum bfd_architecture, unsigned long);
1781 extern bfd_boolean _bfd_elf_find_nearest_line
1782 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1784 extern bfd_boolean _bfd_elf_find_line
1785 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1786 #define _bfd_generic_find_line _bfd_elf_find_line
1787 extern bfd_boolean _bfd_elf_find_inliner_info
1788 (bfd *, const char **, const char **, unsigned int *);
1789 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1790 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1791 extern int _bfd_elf_sizeof_headers
1792 (bfd *, struct bfd_link_info *);
1793 extern bfd_boolean _bfd_elf_new_section_hook
1794 (bfd *, asection *);
1795 extern bfd_boolean _bfd_elf_init_reloc_shdr
1796 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1797 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1798 (const char *, const struct bfd_elf_special_section *, unsigned int);
1799 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1800 (bfd *, asection *);
1802 /* If the target doesn't have reloc handling written yet: */
1803 extern void _bfd_elf_no_info_to_howto
1804 (bfd *, arelent *, Elf_Internal_Rela *);
1806 extern bfd_boolean bfd_section_from_shdr
1807 (bfd *, unsigned int shindex);
1808 extern bfd_boolean bfd_section_from_phdr
1809 (bfd *, Elf_Internal_Phdr *, int);
1811 extern int _bfd_elf_symbol_from_bfd_symbol
1812 (bfd *, asymbol **);
1814 extern asection *bfd_section_from_r_symndx
1815 (bfd *, struct sym_sec_cache *, asection *, unsigned long);
1816 extern asection *bfd_section_from_elf_index
1817 (bfd *, unsigned int);
1818 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1821 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1823 extern void _bfd_elf_strtab_free
1824 (struct elf_strtab_hash *);
1825 extern bfd_size_type _bfd_elf_strtab_add
1826 (struct elf_strtab_hash *, const char *, bfd_boolean);
1827 extern void _bfd_elf_strtab_addref
1828 (struct elf_strtab_hash *, bfd_size_type);
1829 extern void _bfd_elf_strtab_delref
1830 (struct elf_strtab_hash *, bfd_size_type);
1831 extern void _bfd_elf_strtab_clear_all_refs
1832 (struct elf_strtab_hash *);
1833 extern bfd_size_type _bfd_elf_strtab_size
1834 (struct elf_strtab_hash *);
1835 extern bfd_size_type _bfd_elf_strtab_offset
1836 (struct elf_strtab_hash *, bfd_size_type);
1837 extern bfd_boolean _bfd_elf_strtab_emit
1838 (bfd *, struct elf_strtab_hash *);
1839 extern void _bfd_elf_strtab_finalize
1840 (struct elf_strtab_hash *);
1842 extern void _bfd_elf_begin_eh_frame_parsing
1843 (struct bfd_link_info *info);
1844 extern void _bfd_elf_parse_eh_frame
1845 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1846 extern void _bfd_elf_end_eh_frame_parsing
1847 (struct bfd_link_info *info);
1849 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1850 (bfd *, struct bfd_link_info *, asection *,
1851 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1852 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1853 (bfd *, struct bfd_link_info *);
1854 extern bfd_vma _bfd_elf_eh_frame_section_offset
1855 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1856 extern bfd_boolean _bfd_elf_write_section_eh_frame
1857 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1858 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1859 (bfd *, struct bfd_link_info *);
1860 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1861 (struct bfd_link_info *);
1863 extern bfd_boolean _bfd_elf_merge_symbol
1864 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1865 asection **, bfd_vma *, unsigned int *,
1866 struct elf_link_hash_entry **, bfd_boolean *,
1867 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1869 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1871 extern bfd_boolean _bfd_elf_add_default_symbol
1872 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
1873 const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
1874 bfd_boolean *, bfd_boolean);
1876 extern bfd_boolean _bfd_elf_export_symbol
1877 (struct elf_link_hash_entry *, void *);
1879 extern bfd_boolean _bfd_elf_link_find_version_dependencies
1880 (struct elf_link_hash_entry *, void *);
1882 extern bfd_boolean _bfd_elf_link_assign_sym_version
1883 (struct elf_link_hash_entry *, void *);
1885 extern long _bfd_elf_link_lookup_local_dynindx
1886 (struct bfd_link_info *, bfd *, long);
1887 extern bfd_boolean _bfd_elf_compute_section_file_positions
1888 (bfd *, struct bfd_link_info *);
1889 extern void _bfd_elf_assign_file_positions_for_relocs
1891 extern file_ptr _bfd_elf_assign_file_position_for_section
1892 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1894 extern bfd_boolean _bfd_elf_validate_reloc
1897 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1898 (bfd *, struct bfd_link_info *);
1899 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1900 (bfd *, struct bfd_link_info *, asection *);
1901 extern bfd_boolean _bfd_elf_create_dynamic_sections
1902 (bfd *, struct bfd_link_info *);
1903 extern bfd_boolean _bfd_elf_create_got_section
1904 (bfd *, struct bfd_link_info *);
1905 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1906 (bfd *, struct bfd_link_info *, asection *, const char *);
1907 extern void _bfd_elf_init_1_index_section
1908 (bfd *, struct bfd_link_info *);
1909 extern void _bfd_elf_init_2_index_sections
1910 (bfd *, struct bfd_link_info *);
1912 extern bfd_boolean _bfd_elfcore_make_pseudosection
1913 (bfd *, char *, size_t, ufile_ptr);
1914 extern char *_bfd_elfcore_strndup
1915 (bfd *, char *, size_t);
1917 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1918 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1920 extern bfd_boolean _bfd_elf_link_size_reloc_section
1921 (bfd *, Elf_Internal_Shdr *, asection *);
1923 extern bfd_boolean _bfd_elf_link_output_relocs
1924 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1925 struct elf_link_hash_entry **);
1927 extern bfd_boolean _bfd_elf_fix_symbol_flags
1928 (struct elf_link_hash_entry *, struct elf_info_failed *);
1930 extern bfd_boolean _bfd_elf_adjust_dynamic_symbol
1931 (struct elf_link_hash_entry *, void *);
1933 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1934 (struct elf_link_hash_entry *, asection *);
1936 extern bfd_boolean _bfd_elf_link_sec_merge_syms
1937 (struct elf_link_hash_entry *, void *);
1939 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1940 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1942 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1943 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1945 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1946 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
1948 extern bfd_boolean _bfd_elf_setup_sections
1951 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
1953 extern const bfd_target *bfd_elf32_object_p
1955 extern const bfd_target *bfd_elf32_core_file_p
1957 extern char *bfd_elf32_core_file_failing_command
1959 extern int bfd_elf32_core_file_failing_signal
1961 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1964 extern bfd_boolean bfd_elf32_swap_symbol_in
1965 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1966 extern void bfd_elf32_swap_symbol_out
1967 (bfd *, const Elf_Internal_Sym *, void *, void *);
1968 extern void bfd_elf32_swap_reloc_in
1969 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1970 extern void bfd_elf32_swap_reloc_out
1971 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1972 extern void bfd_elf32_swap_reloca_in
1973 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1974 extern void bfd_elf32_swap_reloca_out
1975 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1976 extern void bfd_elf32_swap_phdr_in
1977 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
1978 extern void bfd_elf32_swap_phdr_out
1979 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
1980 extern void bfd_elf32_swap_dyn_in
1981 (bfd *, const void *, Elf_Internal_Dyn *);
1982 extern void bfd_elf32_swap_dyn_out
1983 (bfd *, const Elf_Internal_Dyn *, void *);
1984 extern long bfd_elf32_slurp_symbol_table
1985 (bfd *, asymbol **, bfd_boolean);
1986 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
1988 extern int bfd_elf32_write_out_phdrs
1989 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1990 extern bfd_boolean bfd_elf32_checksum_contents
1991 (bfd * , void (*) (const void *, size_t, void *), void *);
1992 extern void bfd_elf32_write_relocs
1993 (bfd *, asection *, void *);
1994 extern bfd_boolean bfd_elf32_slurp_reloc_table
1995 (bfd *, asection *, asymbol **, bfd_boolean);
1997 extern const bfd_target *bfd_elf64_object_p
1999 extern const bfd_target *bfd_elf64_core_file_p
2001 extern char *bfd_elf64_core_file_failing_command
2003 extern int bfd_elf64_core_file_failing_signal
2005 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2008 extern bfd_boolean bfd_elf64_swap_symbol_in
2009 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2010 extern void bfd_elf64_swap_symbol_out
2011 (bfd *, const Elf_Internal_Sym *, void *, void *);
2012 extern void bfd_elf64_swap_reloc_in
2013 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2014 extern void bfd_elf64_swap_reloc_out
2015 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2016 extern void bfd_elf64_swap_reloca_in
2017 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2018 extern void bfd_elf64_swap_reloca_out
2019 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2020 extern void bfd_elf64_swap_phdr_in
2021 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2022 extern void bfd_elf64_swap_phdr_out
2023 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2024 extern void bfd_elf64_swap_dyn_in
2025 (bfd *, const void *, Elf_Internal_Dyn *);
2026 extern void bfd_elf64_swap_dyn_out
2027 (bfd *, const Elf_Internal_Dyn *, void *);
2028 extern long bfd_elf64_slurp_symbol_table
2029 (bfd *, asymbol **, bfd_boolean);
2030 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2032 extern int bfd_elf64_write_out_phdrs
2033 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2034 extern bfd_boolean bfd_elf64_checksum_contents
2035 (bfd * , void (*) (const void *, size_t, void *), void *);
2036 extern void bfd_elf64_write_relocs
2037 (bfd *, asection *, void *);
2038 extern bfd_boolean bfd_elf64_slurp_reloc_table
2039 (bfd *, asection *, asymbol **, bfd_boolean);
2041 extern bfd_boolean _bfd_elf_default_relocs_compatible
2042 (const bfd_target *, const bfd_target *);
2044 extern bfd_boolean _bfd_elf_relocs_compatible
2045 (const bfd_target *, const bfd_target *);
2047 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2048 (bfd *, struct bfd_link_info *, const char *);
2049 extern bfd_boolean bfd_elf_link_add_symbols
2050 (bfd *, struct bfd_link_info *);
2051 extern bfd_boolean _bfd_elf_add_dynamic_entry
2052 (struct bfd_link_info *, bfd_vma, bfd_vma);
2054 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2055 (struct bfd_link_info *, struct elf_link_hash_entry *);
2057 extern int bfd_elf_link_record_local_dynamic_symbol
2058 (struct bfd_link_info *, bfd *, long);
2060 extern void bfd_elf_link_mark_dynamic_symbol
2061 (struct bfd_link_info *, struct elf_link_hash_entry *,
2062 Elf_Internal_Sym *);
2064 extern bfd_boolean _bfd_elf_close_and_cleanup
2067 extern bfd_boolean _bfd_elf_common_definition
2068 (Elf_Internal_Sym *);
2070 extern unsigned int _bfd_elf_common_section_index
2073 extern asection *_bfd_elf_common_section
2076 extern void _bfd_dwarf2_cleanup_debug_info
2079 extern bfd_vma _bfd_elf_default_got_elt_size
2080 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2083 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2084 (bfd *, arelent *, struct bfd_symbol *, void *,
2085 asection *, bfd *, char **);
2087 extern bfd_boolean bfd_elf_final_link
2088 (bfd *, struct bfd_link_info *);
2090 extern void _bfd_elf_gc_keep
2091 (struct bfd_link_info *info);
2093 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2094 (struct elf_link_hash_entry *h, void *inf);
2096 extern bfd_boolean bfd_elf_gc_sections
2097 (bfd *, struct bfd_link_info *);
2099 extern bfd_boolean bfd_elf_gc_record_vtinherit
2100 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2102 extern bfd_boolean bfd_elf_gc_record_vtentry
2103 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2105 extern asection *_bfd_elf_gc_mark_hook
2106 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2107 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2109 extern asection *_bfd_elf_gc_mark_rsec
2110 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2111 struct elf_reloc_cookie *);
2113 extern bfd_boolean _bfd_elf_gc_mark_reloc
2114 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2115 struct elf_reloc_cookie *);
2117 extern bfd_boolean _bfd_elf_gc_mark_fdes
2118 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2119 struct elf_reloc_cookie *);
2121 extern bfd_boolean _bfd_elf_gc_mark
2122 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2124 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2125 (bfd *, struct bfd_link_info *);
2127 extern bfd_boolean bfd_elf_gc_common_final_link
2128 (bfd *, struct bfd_link_info *);
2130 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2133 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2134 (bfd *, asection *);
2136 extern bfd_boolean _bfd_elf_map_sections_to_segments
2137 (bfd *, struct bfd_link_info *);
2139 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2141 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2142 (bfd * abfd, asection * section);
2144 /* Exported interface for writing elf corefile notes. */
2145 extern char *elfcore_write_note
2146 (bfd *, char *, int *, const char *, int, const void *, int);
2147 extern char *elfcore_write_prpsinfo
2148 (bfd *, char *, int *, const char *, const char *);
2149 extern char *elfcore_write_prstatus
2150 (bfd *, char *, int *, long, int, const void *);
2151 extern char * elfcore_write_pstatus
2152 (bfd *, char *, int *, long, int, const void *);
2153 extern char *elfcore_write_prfpreg
2154 (bfd *, char *, int *, const void *, int);
2155 extern char *elfcore_write_prxfpreg
2156 (bfd *, char *, int *, const void *, int);
2157 extern char *elfcore_write_ppc_vmx
2158 (bfd *, char *, int *, const void *, int);
2159 extern char *elfcore_write_ppc_vsx
2160 (bfd *, char *, int *, const void *, int);
2161 extern char *elfcore_write_lwpstatus
2162 (bfd *, char *, int *, long, int, const void *);
2163 extern char *elfcore_write_register_note
2164 (bfd *, char *, int *, const char *, const void *, int);
2166 extern bfd *_bfd_elf32_bfd_from_remote_memory
2167 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2168 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2169 extern bfd *_bfd_elf64_bfd_from_remote_memory
2170 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2171 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2173 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2174 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2175 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2176 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2177 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2178 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2179 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2180 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2181 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2182 extern void bfd_elf_add_obj_attr_compat (bfd *, int, unsigned int,
2184 #define bfd_elf_add_proc_attr_compat(BFD, INTVAL, STRVAL) \
2185 bfd_elf_add_obj_attr_compat ((BFD), OBJ_ATTR_PROC, (INTVAL), (STRVAL))
2187 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2188 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2189 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2190 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2191 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2193 /* Large common section. */
2194 extern asection _bfd_elf_large_com_section;
2196 /* SH ELF specific routine. */
2198 extern bfd_boolean _sh_elf_set_mach_from_flags
2201 /* This is the condition under which finish_dynamic_symbol will be called.
2202 If our finish_dynamic_symbol isn't called, we'll need to do something
2203 about initializing any .plt and .got entries in relocate_section. */
2204 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2206 && ((SHARED) || !(H)->forced_local) \
2207 && ((H)->dynindx != -1 || (H)->forced_local))
2209 /* This macro is to avoid lots of duplicated code in the body
2210 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2211 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2212 r_symndx, symtab_hdr, sym_hashes, \
2213 h, sec, relocation, \
2214 unresolved_reloc, warned) \
2217 /* It seems this can happen with erroneous or unsupported \
2218 input (mixing a.out and elf in an archive, for example.) */ \
2219 if (sym_hashes == NULL) \
2222 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2224 while (h->root.type == bfd_link_hash_indirect \
2225 || h->root.type == bfd_link_hash_warning) \
2226 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2229 unresolved_reloc = FALSE; \
2231 if (h->root.type == bfd_link_hash_defined \
2232 || h->root.type == bfd_link_hash_defweak) \
2234 sec = h->root.u.def.section; \
2236 || sec->output_section == NULL) \
2237 /* Set a flag that will be cleared later if we find a \
2238 relocation value for this symbol. output_section \
2239 is typically NULL for symbols satisfied by a shared \
2241 unresolved_reloc = TRUE; \
2243 relocation = (h->root.u.def.value \
2244 + sec->output_section->vma \
2245 + sec->output_offset); \
2247 else if (h->root.type == bfd_link_hash_undefweak) \
2249 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2250 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2252 else if (!info->relocatable) \
2255 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2256 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2257 if (!info->callbacks->undefined_symbol (info, \
2258 h->root.root.string, \
2261 rel->r_offset, err)) \
2268 /* Will a symbol be bound to the the definition within the shared
2270 #define SYMBOLIC_BIND(INFO, H) \
2271 ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))
2273 #endif /* _LIBELF_H_ */