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, 2009
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
27 #include "elf/common.h"
28 #include "elf/external.h"
29 #include "elf/internal.h"
32 /* The number of entries in a section is its size divided by the size
33 of a single entry. This is normally only applicable to reloc and
34 symbol table sections.
35 PR 9934: It is possible to have relocations that do not refer to
36 symbols, thus it is also possible to have a relocation section in
37 an object file, but no symbol table. */
38 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
40 /* If size isn't specified as 64 or 32, NAME macro should fail. */
43 #define NAME(x, y) x ## 64 ## _ ## y
46 #define NAME(x, y) x ## 32 ## _ ## y
51 #define NAME(x, y) x ## NOSIZE ## _ ## y
54 #define ElfNAME(X) NAME(Elf,X)
55 #define elfNAME(X) NAME(elf,X)
57 /* Information held for an ELF symbol. The first field is the
58 corresponding asymbol. Every symbol is an ELF file is actually a
59 pointer to this structure, although it is often handled as a
60 pointer to an asymbol. */
66 /* ELF symbol information. */
67 Elf_Internal_Sym internal_elf_sym;
68 /* Backend specific information. */
71 unsigned int hppa_arg_reloc;
77 /* Version information. This is from an Elf_Internal_Versym
78 structure in a SHT_GNU_versym section. It is zero if there is no
79 version information. */
80 unsigned short version;
84 struct elf_strtab_hash;
90 bfd_signed_vma refcount;
92 struct got_entry *glist;
93 struct plt_entry *plist;
96 struct elf_link_virtual_table_entry
98 /* Virtual table entry use information. This array is nominally of size
99 size/sizeof(target_void_pointer), though we have to be able to assume
100 and track a size while the symbol is still undefined. It is indexed
101 via offset/sizeof(target_void_pointer). */
105 /* Virtual table derivation info. */
106 struct elf_link_hash_entry *parent;
109 /* ELF linker hash table entries. */
111 struct elf_link_hash_entry
113 struct bfd_link_hash_entry root;
115 /* Symbol index in output file. This is initialized to -1. It is
116 set to -2 if the symbol is used by a reloc. */
119 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
120 -1 if this is not a dynamic symbol. */
121 /* ??? Note that this is consistently used as a synonym for tests
122 against whether we can perform various simplifying transformations
123 to the code. (E.g. changing a pc-relative jump to a PLT entry
124 into a pc-relative jump to the target function.) That test, which
125 is often relatively complex, and someplaces wrong or incomplete,
126 should really be replaced by a predicate in elflink.c.
128 End result: this field -1 does not indicate that the symbol is
129 not in the dynamic symbol table, but rather that the symbol is
130 not visible outside this DSO. */
133 /* If this symbol requires an entry in the global offset table, the
134 processor specific backend uses this field to track usage and
135 final offset. Two schemes are supported: The first assumes that
136 a symbol may only have one GOT entry, and uses REFCOUNT until
137 size_dynamic_sections, at which point the contents of the .got is
138 fixed. Afterward, if OFFSET is -1, then the symbol does not
139 require a global offset table entry. The second scheme allows
140 multiple GOT entries per symbol, managed via a linked list
141 pointed to by GLIST. */
142 union gotplt_union got;
144 /* Same, but tracks a procedure linkage table entry. */
145 union gotplt_union plt;
150 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
151 unsigned int type : 8;
153 /* Symbol st_other value, symbol visibility. */
154 unsigned int other : 8;
156 /* Symbol is referenced by a non-shared object (other than the object
157 in which it is defined). */
158 unsigned int ref_regular : 1;
159 /* Symbol is defined by a non-shared object. */
160 unsigned int def_regular : 1;
161 /* Symbol is referenced by a shared object. */
162 unsigned int ref_dynamic : 1;
163 /* Symbol is defined by a shared object. */
164 unsigned int def_dynamic : 1;
165 /* Symbol has a non-weak reference from a non-shared object (other than
166 the object in which it is defined). */
167 unsigned int ref_regular_nonweak : 1;
168 /* Dynamic symbol has been adjustd. */
169 unsigned int dynamic_adjusted : 1;
170 /* Symbol needs a copy reloc. */
171 unsigned int needs_copy : 1;
172 /* Symbol needs a procedure linkage table entry. */
173 unsigned int needs_plt : 1;
174 /* Symbol appears in a non-ELF input file. */
175 unsigned int non_elf : 1;
176 /* Symbol should be marked as hidden in the version information. */
177 unsigned int hidden : 1;
178 /* Symbol was forced to local scope due to a version script file. */
179 unsigned int forced_local : 1;
180 /* Symbol was forced to be dynamic due to a version script file. */
181 unsigned int dynamic : 1;
182 /* Symbol was marked during garbage collection. */
183 unsigned int mark : 1;
184 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
185 not currently set by all the backends. */
186 unsigned int non_got_ref : 1;
187 /* Symbol has a definition in a shared object.
188 FIXME: There is no real need for this field if def_dynamic is never
189 cleared and all places that test def_dynamic also test def_regular. */
190 unsigned int dynamic_def : 1;
191 /* Symbol is weak in all shared objects. */
192 unsigned int dynamic_weak : 1;
193 /* Symbol is referenced with a relocation where C/C++ pointer equality
195 unsigned int pointer_equality_needed : 1;
196 /* Symbol is a unique global symbol. */
197 unsigned int unique_global : 1;
199 /* String table index in .dynstr if this is a dynamic symbol. */
200 unsigned long dynstr_index;
204 /* If this is a weak defined symbol from a dynamic object, this
205 field points to a defined symbol with the same value, if there is
206 one. Otherwise it is NULL. */
207 struct elf_link_hash_entry *weakdef;
209 /* Hash value of the name computed using the ELF hash function.
210 Used part way through size_dynamic_sections, after we've finished
212 unsigned long elf_hash_value;
215 /* Version information. */
218 /* This field is used for a symbol which is not defined in a
219 regular object. It points to the version information read in
220 from the dynamic object. */
221 Elf_Internal_Verdef *verdef;
222 /* This field is used for a symbol which is defined in a regular
223 object. It is set up in size_dynamic_sections. It points to
224 the version information we should write out for this symbol. */
225 struct bfd_elf_version_tree *vertree;
228 struct elf_link_virtual_table_entry *vtable;
231 /* Will references to this symbol always reference the symbol
232 in this object? STV_PROTECTED is excluded from the visibility test
233 here so that function pointer comparisons work properly. Since
234 function symbols not defined in an app are set to their .plt entry,
235 it's necessary for shared libs to also reference the .plt even
236 though the symbol is really local to the shared lib. */
237 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
238 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
240 /* Will _calls_ to this symbol always call the version in this object? */
241 #define SYMBOL_CALLS_LOCAL(INFO, H) \
242 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
244 /* Common symbols that are turned into definitions don't have the
245 DEF_REGULAR flag set, so they might appear to be undefined. */
246 #define ELF_COMMON_DEF_P(H) \
248 && !(H)->def_dynamic \
249 && (H)->root.type == bfd_link_hash_defined)
251 /* Records local symbols to be emitted in the dynamic symbol table. */
253 struct elf_link_local_dynamic_entry
255 struct elf_link_local_dynamic_entry *next;
257 /* The input bfd this symbol came from. */
260 /* The index of the local symbol being copied. */
263 /* The index in the outgoing dynamic symbol table. */
266 /* A copy of the input symbol. */
267 Elf_Internal_Sym isym;
270 struct elf_link_loaded_list
272 struct elf_link_loaded_list *next;
276 /* Structures used by the eh_frame optimization code. */
281 /* If REMOVED == 1, this is the CIE that the FDE originally used.
282 The CIE belongs to the same .eh_frame input section as the FDE.
284 If REMOVED == 0, this is the CIE that we have chosen to use for
285 the output FDE. The CIE's REMOVED field is also 0, but the CIE
286 might belong to a different .eh_frame input section from the FDE. */
287 struct eh_cie_fde *cie_inf;
288 struct eh_cie_fde *next_for_section;
291 /* CIEs have three states:
293 - REMOVED && !MERGED: Slated for removal because we haven't yet
294 proven that an FDE needs it. FULL_CIE, if nonnull, points to
295 more detailed information about the CIE.
297 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
298 which may not belong to the same input section.
300 - !REMOVED: We have decided to keep this CIE. SEC is the
301 .eh_frame input section that contains the CIE. */
303 struct cie *full_cie;
304 struct eh_cie_fde *merged_with;
308 /* The offset of the personality data from the start of the CIE,
309 or 0 if the CIE doesn't have any. */
310 unsigned int personality_offset : 8;
312 /* True if we have marked relocations associated with this CIE. */
313 unsigned int gc_mark : 1;
315 /* True if we have decided to turn an absolute LSDA encoding into
316 a PC-relative one. */
317 unsigned int make_lsda_relative : 1;
319 /* True if we have decided to turn an absolute personality
320 encoding into a PC-relative one. */
321 unsigned int make_per_encoding_relative : 1;
323 /* True if the CIE contains personality data and if that
324 data uses a PC-relative encoding. Always true when
325 make_per_encoding_relative is. */
326 unsigned int per_encoding_relative : 1;
328 /* True if we need to add an 'R' (FDE encoding) entry to the
329 CIE's augmentation data. */
330 unsigned int add_fde_encoding : 1;
332 /* True if we have merged this CIE with another. */
333 unsigned int merged : 1;
336 unsigned int pad1 : 18;
339 unsigned int reloc_index;
342 unsigned int new_offset;
343 unsigned int fde_encoding : 8;
344 unsigned int lsda_encoding : 8;
345 unsigned int lsda_offset : 8;
347 /* True if this entry represents a CIE, false if it represents an FDE. */
348 unsigned int cie : 1;
350 /* True if this entry is currently marked for removal. */
351 unsigned int removed : 1;
353 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
354 augmentation data, and an associated byte to each of the CIE's FDEs. */
355 unsigned int add_augmentation_size : 1;
357 /* True if we have decided to convert absolute FDE relocations into
358 relative ones. This applies to the first relocation in the FDE,
359 which is against the code that the FDE describes. */
360 unsigned int make_relative : 1;
363 unsigned int pad1 : 4;
365 unsigned int *set_loc;
368 struct eh_frame_sec_info
372 struct eh_cie_fde entry[1];
375 struct eh_frame_array_ent
383 struct eh_frame_hdr_info
387 unsigned int fde_count, array_count;
388 struct eh_frame_array_ent *array;
389 /* TRUE if we should try to merge CIEs between input sections. */
390 bfd_boolean merge_cies;
391 /* TRUE if all .eh_frames have been parsd. */
392 bfd_boolean parsed_eh_frames;
393 /* TRUE if .eh_frame_hdr should contain the sorted search table.
394 We build it if we successfully read all .eh_frame input sections
395 and recognize them. */
399 /* ELF linker hash table. */
401 struct elf_link_hash_table
403 struct bfd_link_hash_table root;
405 /* Whether we have created the special dynamic sections required
406 when linking against or generating a shared object. */
407 bfd_boolean dynamic_sections_created;
409 /* True if this target has relocatable executables, so needs dynamic
411 bfd_boolean is_relocatable_executable;
413 /* The BFD used to hold special sections created by the linker.
414 This will be the first BFD found which requires these sections to
418 /* The value to use when initialising got.refcount/offset and
419 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
420 the values are refcounts. Set to init_got_offset/init_plt_offset
421 in size_dynamic_sections when the values may be offsets. */
422 union gotplt_union init_got_refcount;
423 union gotplt_union init_plt_refcount;
425 /* The value to use for got.refcount/offset and plt.refcount/offset
426 when the values may be offsets. Normally (bfd_vma) -1. */
427 union gotplt_union init_got_offset;
428 union gotplt_union init_plt_offset;
430 /* The number of symbols found in the link which must be put into
431 the .dynsym section. */
432 bfd_size_type dynsymcount;
434 /* The string table of dynamic symbols, which becomes the .dynstr
436 struct elf_strtab_hash *dynstr;
438 /* The number of buckets in the hash table in the .hash section.
439 This is based on the number of dynamic symbols. */
440 bfd_size_type bucketcount;
442 /* A linked list of DT_NEEDED names found in dynamic objects
443 included in the link. */
444 struct bfd_link_needed_list *needed;
446 /* Sections in the output bfd that provides a section symbol
447 to be used by relocations emitted against local symbols.
448 Most targets will not use data_index_section. */
449 asection *text_index_section;
450 asection *data_index_section;
452 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
453 struct elf_link_hash_entry *hgot;
455 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
456 struct elf_link_hash_entry *hplt;
458 /* A pointer to information used to merge SEC_MERGE sections. */
461 /* Used to link stabs in sections. */
462 struct stab_info stab_info;
464 /* Used by eh_frame code when editing .eh_frame. */
465 struct eh_frame_hdr_info eh_info;
467 /* A linked list of local symbols to be added to .dynsym. */
468 struct elf_link_local_dynamic_entry *dynlocal;
470 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
471 objects included in the link. */
472 struct bfd_link_needed_list *runpath;
474 /* Cached first output tls section and size of PT_TLS segment. */
476 bfd_size_type tls_size;
478 /* A linked list of BFD's loaded in the link. */
479 struct elf_link_loaded_list *loaded;
481 /* Short-cuts to get to dynamic linker sections. */
493 /* Look up an entry in an ELF linker hash table. */
495 #define elf_link_hash_lookup(table, string, create, copy, follow) \
496 ((struct elf_link_hash_entry *) \
497 bfd_link_hash_lookup (&(table)->root, (string), (create), \
500 /* Traverse an ELF linker hash table. */
502 #define elf_link_hash_traverse(table, func, info) \
503 (bfd_link_hash_traverse \
505 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
508 /* Get the ELF linker hash table from a link_info structure. */
510 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
512 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
513 #define is_elf_hash_table(htab) \
514 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
516 /* Used by bfd_sym_from_r_symndx to cache a small number of local
518 #define LOCAL_SYM_CACHE_SIZE 32
522 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
523 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
526 /* Constant information held for an ELF backend. */
528 struct elf_size_info {
529 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
530 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
532 /* The size of entries in the .hash section. */
533 unsigned char sizeof_hash_entry;
535 /* The number of internal relocations to allocate per external
537 unsigned char int_rels_per_ext_rel;
538 /* We use some fixed size arrays. This should be large enough to
539 handle all back-ends. */
540 #define MAX_INT_RELS_PER_EXT_REL 3
542 unsigned char arch_size, log_file_align;
543 unsigned char elfclass, ev_current;
544 int (*write_out_phdrs)
545 (bfd *, const Elf_Internal_Phdr *, unsigned int);
547 (*write_shdrs_and_ehdr) (bfd *);
548 bfd_boolean (*checksum_contents)
549 (bfd * , void (*) (const void *, size_t, void *), void *);
551 (bfd *, asection *, void *);
552 bfd_boolean (*swap_symbol_in)
553 (bfd *, const void *, const void *, Elf_Internal_Sym *);
554 void (*swap_symbol_out)
555 (bfd *, const Elf_Internal_Sym *, void *, void *);
556 bfd_boolean (*slurp_reloc_table)
557 (bfd *, asection *, asymbol **, bfd_boolean);
558 long (*slurp_symbol_table)
559 (bfd *, asymbol **, bfd_boolean);
561 (bfd *, const void *, Elf_Internal_Dyn *);
563 (bfd *, const Elf_Internal_Dyn *, void *);
565 /* This function is called to swap in a REL relocation. If an
566 external relocation corresponds to more than one internal
567 relocation, then all relocations are swapped in at once. */
568 void (*swap_reloc_in)
569 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
571 /* This function is called to swap out a REL relocation. */
572 void (*swap_reloc_out)
573 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
575 /* This function is called to swap in a RELA relocation. If an
576 external relocation corresponds to more than one internal
577 relocation, then all relocations are swapped in at once. */
578 void (*swap_reloca_in)
579 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
581 /* This function is called to swap out a RELA relocation. */
582 void (*swap_reloca_out)
583 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
586 #define elf_symbol_from(ABFD,S) \
587 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
588 && (S)->the_bfd->tdata.elf_obj_data != 0) \
589 ? (elf_symbol_type *) (S) \
592 enum elf_reloc_type_class {
594 reloc_class_relative,
599 struct elf_reloc_cookie
601 Elf_Internal_Rela *rels, *rel, *relend;
602 Elf_Internal_Sym *locsyms;
606 struct elf_link_hash_entry **sym_hashes;
608 bfd_boolean bad_symtab;
611 /* The level of IRIX compatibility we're striving for. */
619 /* Mapping of ELF section names and types. */
620 struct bfd_elf_special_section
624 /* 0 means name must match PREFIX exactly.
625 -1 means name must start with PREFIX followed by an arbitrary string.
626 -2 means name must match PREFIX exactly or consist of PREFIX followed
627 by a dot then anything.
628 > 0 means name must start with the first PREFIX_LENGTH chars of
629 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
635 enum action_discarded
641 typedef asection * (*elf_gc_mark_hook_fn)
642 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
643 struct elf_link_hash_entry *, Elf_Internal_Sym *);
645 struct elf_backend_data
647 /* The architecture for this backend. */
648 enum bfd_architecture arch;
650 /* The ELF machine code (EM_xxxx) for this backend. */
651 int elf_machine_code;
656 /* The maximum page size for this backend. */
659 /* The minimum page size for this backend. An input object will not be
660 considered page aligned unless its sections are correctly aligned for
661 pages at least this large. May be smaller than maxpagesize. */
664 /* The common page size for this backend. */
665 bfd_vma commonpagesize;
667 /* The BFD flags applied to sections created for dynamic linking. */
668 flagword dynamic_sec_flags;
670 /* A function to translate an ELF RELA relocation to a BFD arelent
672 void (*elf_info_to_howto)
673 (bfd *, arelent *, Elf_Internal_Rela *);
675 /* A function to translate an ELF REL relocation to a BFD arelent
677 void (*elf_info_to_howto_rel)
678 (bfd *, arelent *, Elf_Internal_Rela *);
680 /* A function to determine whether a symbol is global when
681 partitioning the symbol table into local and global symbols.
682 This should be NULL for most targets, in which case the correct
683 thing will be done. MIPS ELF, at least on the Irix 5, has
684 special requirements. */
685 bfd_boolean (*elf_backend_sym_is_global)
688 /* The remaining functions are hooks which are called only if they
691 /* A function to permit a backend specific check on whether a
692 particular BFD format is relevant for an object file, and to
693 permit the backend to set any global information it wishes. When
694 this is called elf_elfheader is set, but anything else should be
695 used with caution. If this returns FALSE, the check_format
696 routine will return a bfd_error_wrong_format error. */
697 bfd_boolean (*elf_backend_object_p)
700 /* A function to do additional symbol processing when reading the
701 ELF symbol table. This is where any processor-specific special
702 section indices are handled. */
703 void (*elf_backend_symbol_processing)
706 /* A function to do additional symbol processing after reading the
707 entire ELF symbol table. */
708 bfd_boolean (*elf_backend_symbol_table_processing)
709 (bfd *, elf_symbol_type *, unsigned int);
711 /* A function to set the type of the info field. Processor-specific
712 types should be handled here. */
713 int (*elf_backend_get_symbol_type)
714 (Elf_Internal_Sym *, int);
716 /* A function to return the linker hash table entry of a symbol that
717 might be satisfied by an archive symbol. */
718 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
719 (bfd *, struct bfd_link_info *, const char *);
721 /* Return true if local section symbols should have a non-null st_name.
722 NULL implies false. */
723 bfd_boolean (*elf_backend_name_local_section_symbols)
726 /* A function to do additional processing on the ELF section header
727 just before writing it out. This is used to set the flags and
728 type fields for some sections, or to actually write out data for
730 bfd_boolean (*elf_backend_section_processing)
731 (bfd *, Elf_Internal_Shdr *);
733 /* A function to handle unusual section types when creating BFD
734 sections from ELF sections. */
735 bfd_boolean (*elf_backend_section_from_shdr)
736 (bfd *, Elf_Internal_Shdr *, const char *, int);
738 /* A function to convert machine dependent ELF section header flags to
739 BFD internal section header flags. */
740 bfd_boolean (*elf_backend_section_flags)
741 (flagword *, const Elf_Internal_Shdr *);
743 /* A function that returns a struct containing ELF section flags and
744 type for the given BFD section. */
745 const struct bfd_elf_special_section * (*get_sec_type_attr)
748 /* A function to handle unusual program segment types when creating BFD
749 sections from ELF program segments. */
750 bfd_boolean (*elf_backend_section_from_phdr)
751 (bfd *, Elf_Internal_Phdr *, int, const char *);
753 /* A function to set up the ELF section header for a BFD section in
754 preparation for writing it out. This is where the flags and type
755 fields are set for unusual sections. */
756 bfd_boolean (*elf_backend_fake_sections)
757 (bfd *, Elf_Internal_Shdr *, asection *);
759 /* A function to get the ELF section index for a BFD section. If
760 this returns TRUE, the section was found. If it is a normal ELF
761 section, *RETVAL should be left unchanged. If it is not a normal
762 ELF section *RETVAL should be set to the SHN_xxxx index. */
763 bfd_boolean (*elf_backend_section_from_bfd_section)
764 (bfd *, asection *, int *retval);
766 /* If this field is not NULL, it is called by the add_symbols phase
767 of a link just before adding a symbol to the global linker hash
768 table. It may modify any of the fields as it wishes. If *NAME
769 is set to NULL, the symbol will be skipped rather than being
770 added to the hash table. This function is responsible for
771 handling all processor dependent symbol bindings and section
772 indices, and must set at least *FLAGS and *SEC for each processor
773 dependent case; failure to do so will cause a link error. */
774 bfd_boolean (*elf_add_symbol_hook)
775 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
776 const char **name, flagword *flags, asection **sec, bfd_vma *value);
778 /* If this field is not NULL, it is called by the elf_link_output_sym
779 phase of a link for each symbol which will appear in the object file.
780 On error, this function returns 0. 1 is returned when the symbol
781 should be output, 2 is returned when the symbol should be discarded. */
782 int (*elf_backend_link_output_symbol_hook)
783 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
784 asection *, struct elf_link_hash_entry *);
786 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
787 linker the first time it encounters a dynamic object in the link.
788 This function must create any sections required for dynamic
789 linking. The ABFD argument is a dynamic object. The .interp,
790 .dynamic, .dynsym, .dynstr, and .hash functions have already been
791 created, and this function may modify the section flags if
792 desired. This function will normally create the .got and .plt
793 sections, but different backends have different requirements. */
794 bfd_boolean (*elf_backend_create_dynamic_sections)
795 (bfd *abfd, struct bfd_link_info *info);
797 /* When creating a shared library, determine whether to omit the
798 dynamic symbol for the section. */
799 bfd_boolean (*elf_backend_omit_section_dynsym)
800 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
802 /* Return TRUE if relocations of targets are compatible to the extent
803 that CHECK_RELOCS will properly process them. PR 4424. */
804 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
806 /* The CHECK_RELOCS function is called by the add_symbols phase of
807 the ELF backend linker. It is called once for each section with
808 relocs of an object file, just after the symbols for the object
809 file have been added to the global linker hash table. The
810 function must look through the relocs and do any special handling
811 required. This generally means allocating space in the global
812 offset table, and perhaps allocating space for a reloc. The
813 relocs are always passed as Rela structures; if the section
814 actually uses Rel structures, the r_addend field will always be
816 bfd_boolean (*check_relocs)
817 (bfd *abfd, struct bfd_link_info *info, asection *o,
818 const Elf_Internal_Rela *relocs);
820 /* The CHECK_DIRECTIVES function is called once per input file by
821 the add_symbols phase of the ELF backend linker. The function
822 must inspect the bfd and create any additional symbols according
823 to any custom directives in the bfd. */
824 bfd_boolean (*check_directives)
825 (bfd *abfd, struct bfd_link_info *info);
827 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
828 input file that was not needed by the add_symbols phase of the
829 ELF backend linker. The function must undo any target specific
830 changes in the symbol hash table. */
831 bfd_boolean (*as_needed_cleanup)
832 (bfd *abfd, struct bfd_link_info *info);
834 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
835 linker for every symbol which is defined by a dynamic object and
836 referenced by a regular object. This is called after all the
837 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
838 function has been called. The hash table entry should be
839 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
840 defined in a section from a dynamic object. Dynamic object
841 sections are not included in the final link, and this function is
842 responsible for changing the value to something which the rest of
843 the link can deal with. This will normally involve adding an
844 entry to the .plt or .got or some such section, and setting the
845 symbol to point to that. */
846 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
847 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
849 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
850 after all the linker input files have been seen but before the
851 section sizes have been set. This is called after
852 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
853 bfd_boolean (*elf_backend_always_size_sections)
854 (bfd *output_bfd, struct bfd_link_info *info);
856 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
857 linker after all the linker input files have been seen but before
858 the sections sizes have been set. This is called after
859 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
860 It is only called when linking against a dynamic object. It must
861 set the sizes of the dynamic sections, and may fill in their
862 contents as well. The generic ELF linker can handle the .dynsym,
863 .dynstr and .hash sections. This function must handle the
864 .interp section and any sections created by the
865 CREATE_DYNAMIC_SECTIONS entry point. */
866 bfd_boolean (*elf_backend_size_dynamic_sections)
867 (bfd *output_bfd, struct bfd_link_info *info);
869 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
870 we keep to use as a base for relocs and symbols. */
871 void (*elf_backend_init_index_section)
872 (bfd *output_bfd, struct bfd_link_info *info);
874 /* The RELOCATE_SECTION function is called by the ELF backend linker
875 to handle the relocations for a section.
877 The relocs are always passed as Rela structures; if the section
878 actually uses Rel structures, the r_addend field will always be
881 This function is responsible for adjust the section contents as
882 necessary, and (if using Rela relocs and generating a
883 relocatable output file) adjusting the reloc addend as
886 This function does not have to worry about setting the reloc
887 address or the reloc symbol index.
889 LOCAL_SYMS is a pointer to the swapped in local symbols.
891 LOCAL_SECTIONS is an array giving the section in the input file
892 corresponding to the st_shndx field of each local symbol.
894 The global hash table entry for the global symbols can be found
895 via elf_sym_hashes (input_bfd).
897 When generating relocatable output, this function must handle
898 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
899 going to be the section symbol corresponding to the output
900 section, which means that the addend must be adjusted
903 Returns FALSE on error, TRUE on success, 2 if successful and
904 relocations should be written for this section. */
905 int (*elf_backend_relocate_section)
906 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
907 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
908 Elf_Internal_Sym *local_syms, asection **local_sections);
910 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
911 linker just before it writes a symbol out to the .dynsym section.
912 The processor backend may make any required adjustment to the
913 symbol. It may also take the opportunity to set contents of the
914 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
915 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
916 on those symbols which are defined by a dynamic object. */
917 bfd_boolean (*elf_backend_finish_dynamic_symbol)
918 (bfd *output_bfd, struct bfd_link_info *info,
919 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
921 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
922 linker just before it writes all the dynamic sections out to the
923 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
924 all dynamic symbols. */
925 bfd_boolean (*elf_backend_finish_dynamic_sections)
926 (bfd *output_bfd, struct bfd_link_info *info);
928 /* A function to do any beginning processing needed for the ELF file
929 before building the ELF headers and computing file positions. */
930 void (*elf_backend_begin_write_processing)
931 (bfd *, struct bfd_link_info *);
933 /* A function to do any final processing needed for the ELF file
934 before writing it out. The LINKER argument is TRUE if this BFD
935 was created by the ELF backend linker. */
936 void (*elf_backend_final_write_processing)
937 (bfd *, bfd_boolean linker);
939 /* This function is called by get_program_header_size. It should
940 return the number of additional program segments which this BFD
941 will need. It should return -1 on error. */
942 int (*elf_backend_additional_program_headers)
943 (bfd *, struct bfd_link_info *);
945 /* This function is called to modify an existing segment map in a
946 backend specific fashion. */
947 bfd_boolean (*elf_backend_modify_segment_map)
948 (bfd *, struct bfd_link_info *);
950 /* This function is called to modify program headers just before
952 bfd_boolean (*elf_backend_modify_program_headers)
953 (bfd *, struct bfd_link_info *);
955 /* This function is called before section garbage collection to
956 mark entry symbol sections. */
958 (struct bfd_link_info *);
960 /* This function is called during section garbage collection to
961 mark sections that define global symbols. */
962 bfd_boolean (*gc_mark_dynamic_ref)
963 (struct elf_link_hash_entry *, void *);
965 /* This function is called during section gc to discover the section a
966 particular relocation refers to. */
967 elf_gc_mark_hook_fn gc_mark_hook;
969 /* This function, if defined, is called after the first gc marking pass
970 to allow the backend to mark additional sections. */
971 bfd_boolean (*gc_mark_extra_sections)
972 (struct bfd_link_info *, elf_gc_mark_hook_fn);
974 /* This function, if defined, is called during the sweep phase of gc
975 in order that a backend might update any data structures it might
977 bfd_boolean (*gc_sweep_hook)
978 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
980 /* This function, if defined, is called after the ELF headers have
981 been created. This allows for things like the OS and ABI versions
983 void (*elf_backend_post_process_headers)
984 (bfd *, struct bfd_link_info *);
986 /* This function, if defined, prints a symbol to file and returns the
987 name of the symbol to be printed. It should return NULL to fall
988 back to default symbol printing. */
989 const char *(*elf_backend_print_symbol_all)
990 (bfd *, void *, asymbol *);
992 /* This function, if defined, is called after all local symbols and
993 global symbols converted to locals are emitted into the symtab
994 section. It allows the backend to emit special local symbols
995 not handled in the hash table. */
996 bfd_boolean (*elf_backend_output_arch_local_syms)
997 (bfd *, struct bfd_link_info *, void *,
998 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
999 struct elf_link_hash_entry *));
1001 /* This function, if defined, is called after all symbols are emitted
1002 into the symtab section. It allows the backend to emit special
1003 global symbols not handled in the hash table. */
1004 bfd_boolean (*elf_backend_output_arch_syms)
1005 (bfd *, struct bfd_link_info *, void *,
1006 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1007 struct elf_link_hash_entry *));
1009 /* Copy any information related to dynamic linking from a pre-existing
1010 symbol to a newly created symbol. Also called to copy flags and
1011 other back-end info to a weakdef, in which case the symbol is not
1012 newly created and plt/got refcounts and dynamic indices should not
1014 void (*elf_backend_copy_indirect_symbol)
1015 (struct bfd_link_info *, struct elf_link_hash_entry *,
1016 struct elf_link_hash_entry *);
1018 /* Modify any information related to dynamic linking such that the
1019 symbol is not exported. */
1020 void (*elf_backend_hide_symbol)
1021 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1023 /* A function to do additional symbol fixup, called by
1024 _bfd_elf_fix_symbol_flags. */
1025 bfd_boolean (*elf_backend_fixup_symbol)
1026 (struct bfd_link_info *, struct elf_link_hash_entry *);
1028 /* Merge the backend specific symbol attribute. */
1029 void (*elf_backend_merge_symbol_attribute)
1030 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1033 /* This function, if defined, will return a string containing the
1034 name of a target-specific dynamic tag. */
1035 char *(*elf_backend_get_target_dtag)
1038 /* Decide whether an undefined symbol is special and can be ignored.
1039 This is the case for OPTIONAL symbols on IRIX. */
1040 bfd_boolean (*elf_backend_ignore_undef_symbol)
1041 (struct elf_link_hash_entry *);
1043 /* Emit relocations. Overrides default routine for emitting relocs,
1044 except during a relocatable link, or if all relocs are being emitted. */
1045 bfd_boolean (*elf_backend_emit_relocs)
1046 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1047 struct elf_link_hash_entry **);
1049 /* Count relocations. Not called for relocatable links
1050 or if all relocs are being preserved in the output. */
1051 unsigned int (*elf_backend_count_relocs)
1052 (struct bfd_link_info *, asection *);
1054 /* This function, if defined, is called when an NT_PRSTATUS note is found
1056 bfd_boolean (*elf_backend_grok_prstatus)
1057 (bfd *, Elf_Internal_Note *);
1059 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1060 note is found in a core file. */
1061 bfd_boolean (*elf_backend_grok_psinfo)
1062 (bfd *, Elf_Internal_Note *);
1064 /* This function, if defined, is called to write a note to a corefile. */
1065 char *(*elf_backend_write_core_note)
1066 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1068 /* This function returns class of a reloc type. */
1069 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1070 (const Elf_Internal_Rela *);
1072 /* This function, if defined, removes information about discarded functions
1073 from other sections which mention them. */
1074 bfd_boolean (*elf_backend_discard_info)
1075 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1077 /* This function, if defined, signals that the function above has removed
1078 the discarded relocations for this section. */
1079 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1082 /* What to do when ld finds relocations against symbols defined in
1083 discarded sections. */
1084 unsigned int (*action_discarded)
1087 /* This function returns the width of FDE pointers in bytes, or 0 if
1088 that can't be determined for some reason. The default definition
1089 goes by the bfd's EI_CLASS. */
1090 unsigned int (*elf_backend_eh_frame_address_size)
1091 (bfd *, asection *);
1093 /* These functions tell elf-eh-frame whether to attempt to turn
1094 absolute or lsda encodings into pc-relative ones. The default
1095 definition enables these transformations. */
1096 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1097 (bfd *, struct bfd_link_info *, asection *);
1098 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1099 (bfd *, struct bfd_link_info *, asection *);
1101 /* This function returns an encoding after computing the encoded
1102 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1103 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1104 The default definition chooses a 32-bit PC-relative encoding. */
1105 bfd_byte (*elf_backend_encode_eh_address)
1106 (bfd *abfd, struct bfd_link_info *info,
1107 asection *osec, bfd_vma offset,
1108 asection *loc_sec, bfd_vma loc_offset,
1111 /* This function, if defined, may write out the given section.
1112 Returns TRUE if it did so and FALSE if the caller should. */
1113 bfd_boolean (*elf_backend_write_section)
1114 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1116 /* The level of IRIX compatibility we're striving for.
1117 MIPS ELF specific function. */
1118 irix_compat_t (*elf_backend_mips_irix_compat)
1121 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1122 (unsigned int, bfd_boolean);
1124 /* The swapping table to use when dealing with ECOFF information.
1125 Used for the MIPS ELF .mdebug section. */
1126 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1128 /* This function implements `bfd_elf_bfd_from_remote_memory';
1129 see elf.c, elfcode.h. */
1130 bfd *(*elf_backend_bfd_from_remote_memory)
1131 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1132 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
1134 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1136 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1138 /* Is symbol defined in common section? */
1139 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1141 /* Return a common section index for section. */
1142 unsigned int (*common_section_index) (asection *);
1144 /* Return a common section for section. */
1145 asection *(*common_section) (asection *);
1147 /* Return TRUE if we can merge 2 definitions. */
1148 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1149 struct elf_link_hash_entry **,
1150 struct elf_link_hash_entry *,
1151 Elf_Internal_Sym *, asection **,
1152 bfd_vma *, unsigned int *,
1153 bfd_boolean *, bfd_boolean *,
1154 bfd_boolean *, bfd_boolean *,
1155 bfd_boolean *, bfd_boolean *,
1156 bfd_boolean *, bfd_boolean *,
1158 bfd_boolean *, bfd_boolean *,
1159 bfd_boolean *, bfd_boolean *,
1160 bfd *, asection **);
1162 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1163 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1165 /* Return TRUE if type is a function symbol type. */
1166 bfd_boolean (*is_function_type) (unsigned int type);
1168 /* Used to handle bad SHF_LINK_ORDER input. */
1169 bfd_error_handler_type link_order_error_handler;
1171 /* Name of the PLT relocation section. */
1172 const char *relplt_name;
1174 /* Alternate EM_xxxx machine codes for this backend. */
1175 int elf_machine_alt1;
1176 int elf_machine_alt2;
1178 const struct elf_size_info *s;
1180 /* An array of target specific special sections. */
1181 const struct bfd_elf_special_section *special_sections;
1183 /* The size in bytes of the header for the GOT. This includes the
1184 so-called reserved entries on some systems. */
1185 bfd_vma got_header_size;
1187 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1188 otherwise by the local symbol with index SYMNDX in IBFD. */
1189 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1190 struct elf_link_hash_entry *h,
1191 bfd *ibfd, unsigned long symndx);
1193 /* The vendor name to use for a processor-standard attributes section. */
1194 const char *obj_attrs_vendor;
1196 /* The section name to use for a processor-standard attributes section. */
1197 const char *obj_attrs_section;
1199 /* Return 1, 2 or 3 to indicate what type of arguments a
1200 processor-specific tag takes. */
1201 int (*obj_attrs_arg_type) (int);
1203 /* The section type to use for an attributes section. */
1204 unsigned int obj_attrs_section_type;
1206 /* This function determines the order in which any attributes are written.
1207 It must be defined for input in the range 4..NUM_KNOWN_OBJ_ATTRIBUTES-1
1208 (this range is used in order to make unity easy). The returned value is
1209 the actual tag number to place in the input position. */
1210 int (*obj_attrs_order) (int);
1212 /* This is TRUE if the linker should act like collect and gather
1213 global constructors and destructors by name. This is TRUE for
1214 MIPS ELF because the Irix 5 tools can not handle the .init
1216 unsigned collect : 1;
1218 /* This is TRUE if the linker should ignore changes to the type of a
1219 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1220 record undefined functions as STT_OBJECT although the definitions
1222 unsigned type_change_ok : 1;
1224 /* Whether the backend may use REL relocations. (Some backends use
1225 both REL and RELA relocations, and this flag is set for those
1227 unsigned may_use_rel_p : 1;
1229 /* Whether the backend may use RELA relocations. (Some backends use
1230 both REL and RELA relocations, and this flag is set for those
1232 unsigned may_use_rela_p : 1;
1234 /* Whether the default relocation type is RELA. If a backend with
1235 this flag set wants REL relocations for a particular section,
1236 it must note that explicitly. Similarly, if this flag is clear,
1237 and the backend wants RELA relocations for a particular
1239 unsigned default_use_rela_p : 1;
1241 /* True if PLT and copy relocations should be RELA by default. */
1242 unsigned rela_plts_and_copies_p : 1;
1244 /* Set if RELA relocations for a relocatable link can be handled by
1245 generic code. Backends that set this flag need do nothing in the
1246 backend relocate_section routine for relocatable linking. */
1247 unsigned rela_normal : 1;
1249 /* TRUE if addresses "naturally" sign extend. This is used when
1250 swapping in from Elf32 when BFD64. */
1251 unsigned sign_extend_vma : 1;
1253 unsigned want_got_plt : 1;
1254 unsigned plt_readonly : 1;
1255 unsigned want_plt_sym : 1;
1256 unsigned plt_not_loaded : 1;
1257 unsigned plt_alignment : 4;
1258 unsigned can_gc_sections : 1;
1259 unsigned can_refcount : 1;
1260 unsigned want_got_sym : 1;
1261 unsigned want_dynbss : 1;
1263 /* Targets which do not support physical addressing often require
1264 that the p_paddr field in the section header to be set to zero.
1265 This field indicates whether this behavior is required. */
1266 unsigned want_p_paddr_set_to_zero : 1;
1268 /* True if an object file lacking a .note.GNU-stack section
1269 should be assumed to be requesting exec stack. At least one
1270 other file in the link needs to have a .note.GNU-stack section
1271 for a PT_GNU_STACK segment to be created. */
1272 unsigned default_execstack : 1;
1275 /* Information stored for each BFD section in an ELF file. This
1276 structure is allocated by elf_new_section_hook. */
1278 struct bfd_elf_section_data
1280 /* The ELF header for this section. */
1281 Elf_Internal_Shdr this_hdr;
1283 /* The ELF header for the reloc section associated with this
1285 Elf_Internal_Shdr rel_hdr;
1287 /* If there is a second reloc section associated with this section,
1288 as can happen on Irix 6, this field points to the header. */
1289 Elf_Internal_Shdr *rel_hdr2;
1291 /* The number of relocations currently assigned to REL_HDR. */
1292 unsigned int rel_count;
1294 /* The number of relocations currently assigned to REL_HDR2. */
1295 unsigned int rel_count2;
1297 /* The ELF section number of this section. */
1300 /* The ELF section number of the reloc section indicated by
1301 REL_HDR if any. Only used for an output file. */
1304 /* The ELF section number of the reloc section indicated by
1305 REL_HDR2 if any. Only used for an output file. */
1308 /* Used by the backend linker when generating a shared library to
1309 record the dynamic symbol index for a section symbol
1310 corresponding to this section. A value of 0 means that there is
1311 no dynamic symbol for this section. */
1314 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1315 asection *linked_to;
1317 /* Used by the backend linker to store the symbol hash table entries
1318 associated with relocs against global symbols. */
1319 struct elf_link_hash_entry **rel_hashes;
1321 /* A pointer to the swapped relocs. If the section uses REL relocs,
1322 rather than RELA, all the r_addend fields will be zero. This
1323 pointer may be NULL. It is used by the backend linker. */
1324 Elf_Internal_Rela *relocs;
1326 /* A pointer to a linked list tracking dynamic relocs copied for
1330 /* A pointer to the bfd section used for dynamic relocs. */
1334 /* Group name, if this section is a member of a group. */
1337 /* Group signature sym, if this is the SHT_GROUP section. */
1338 struct bfd_symbol *id;
1341 /* For a member of a group, points to the SHT_GROUP section.
1342 NULL for the SHT_GROUP section itself and non-group sections. */
1343 asection *sec_group;
1345 /* A linked list of member sections in the group. Circular when used by
1346 the linker. For the SHT_GROUP section, points at first member. */
1347 asection *next_in_group;
1349 /* The FDEs associated with this section. The u.fde.next_in_section
1350 field acts as a chain pointer. */
1351 struct eh_cie_fde *fde_list;
1353 /* A pointer used for various section optimizations. */
1357 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1358 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1359 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1360 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1361 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1362 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1363 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1364 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1365 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1367 #define xvec_get_elf_backend_data(xvec) \
1368 ((const struct elf_backend_data *) (xvec)->backend_data)
1370 #define get_elf_backend_data(abfd) \
1371 xvec_get_elf_backend_data ((abfd)->xvec)
1373 /* The maximum number of known object attributes for any target. */
1374 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1376 /* The value of an object attribute. The type indicates whether the attribute
1377 holds and integer, a string, or both. It can also indicate that there can
1378 be no default (i.e. all values must be written to file, even zero). */
1380 typedef struct obj_attribute
1382 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1383 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1384 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1386 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1387 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1388 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1395 typedef struct obj_attribute_list
1397 struct obj_attribute_list *next;
1400 } obj_attribute_list;
1402 /* Object attributes may either be defined by the processor ABI, index
1403 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1404 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1405 #define OBJ_ATTR_PROC 0
1406 #define OBJ_ATTR_GNU 1
1407 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1408 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1410 /* The following object attribute tags are taken as generic, for all
1411 targets and for "gnu" where there is no target standard. */
1418 Tag_compatibility = 32
1421 /* Enum used to identify target specific extensions to the elf_obj_tdata
1422 structure. Note the enums deliberately start from 1 so that we can
1423 detect an uninitialized field. The generic value is last so that
1424 additions to this enum do not need to modify more than one line. */
1427 ALPHA_ELF_TDATA = 1,
1442 /* Some private data is stashed away for future use using the tdata pointer
1443 in the bfd structure. */
1445 struct elf_obj_tdata
1447 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1448 Elf_Internal_Shdr **elf_sect_ptr;
1449 Elf_Internal_Phdr *phdr;
1450 struct elf_segment_map *segment_map;
1451 struct elf_strtab_hash *strtab_ptr;
1454 unsigned int num_elf_sections; /* elf_sect_ptr size */
1455 int num_section_syms;
1456 asymbol **section_syms; /* STT_SECTION symbols for each section */
1457 Elf_Internal_Shdr symtab_hdr;
1458 Elf_Internal_Shdr shstrtab_hdr;
1459 Elf_Internal_Shdr strtab_hdr;
1460 Elf_Internal_Shdr dynsymtab_hdr;
1461 Elf_Internal_Shdr dynstrtab_hdr;
1462 Elf_Internal_Shdr dynversym_hdr;
1463 Elf_Internal_Shdr dynverref_hdr;
1464 Elf_Internal_Shdr dynverdef_hdr;
1465 Elf_Internal_Shdr symtab_shndx_hdr;
1466 unsigned int symtab_section, shstrtab_section;
1467 unsigned int strtab_section, dynsymtab_section;
1468 unsigned int symtab_shndx_section;
1469 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1470 file_ptr next_file_pos;
1471 bfd_vma gp; /* The gp value */
1472 unsigned int gp_size; /* The gp size */
1474 /* Information grabbed from an elf core file. */
1481 /* A mapping from external symbols to entries in the linker hash
1482 table, used when linking. This is indexed by the symbol index
1483 minus the sh_info field of the symbol table header. */
1484 struct elf_link_hash_entry **sym_hashes;
1486 /* Track usage and final offsets of GOT entries for local symbols.
1487 This array is indexed by symbol index. Elements are used
1488 identically to "got" in struct elf_link_hash_entry. */
1491 bfd_signed_vma *refcounts;
1493 struct got_entry **ents;
1496 /* The linker ELF emulation code needs to let the backend ELF linker
1497 know what filename should be used for a dynamic object if the
1498 dynamic object is found using a search. The emulation code then
1499 sometimes needs to know what name was actually used. Until the
1500 file has been added to the linker symbol table, this field holds
1501 the name the linker wants. After it has been added, it holds the
1502 name actually used, which will be the DT_SONAME entry if there is
1504 const char *dt_name;
1506 /* The linker emulation needs to know what audit libs
1507 are used by a dynamic object. */
1508 const char *dt_audit;
1510 /* Records the result of `get_program_header_size'. */
1511 bfd_size_type program_header_size;
1513 /* Used by find_nearest_line entry point. */
1516 /* Used by MIPS ELF find_nearest_line entry point. The structure
1517 could be included directly in this one, but there's no point to
1518 wasting the memory just for the infrequently called
1519 find_nearest_line. */
1520 struct mips_elf_find_line *find_line_info;
1522 /* A place to stash dwarf1 info for this bfd. */
1523 struct dwarf1_debug *dwarf1_find_line_info;
1525 /* A place to stash dwarf2 info for this bfd. */
1526 void *dwarf2_find_line_info;
1528 /* An array of stub sections indexed by symbol number, used by the
1529 MIPS ELF linker. FIXME: We should figure out some way to only
1530 include this field for a MIPS ELF target. */
1531 asection **local_stubs;
1532 asection **local_call_stubs;
1534 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1536 asection *eh_frame_hdr;
1538 Elf_Internal_Shdr **group_sect_ptr;
1541 /* Number of symbol version definitions we are about to emit. */
1542 unsigned int cverdefs;
1544 /* Number of symbol version references we are about to emit. */
1545 unsigned int cverrefs;
1547 /* Segment flags for the PT_GNU_STACK segment. */
1548 unsigned int stack_flags;
1550 /* Symbol version definitions in external objects. */
1551 Elf_Internal_Verdef *verdef;
1553 /* Symbol version references to external objects. */
1554 Elf_Internal_Verneed *verref;
1556 /* The Irix 5 support uses two virtual sections, which represent
1557 text/data symbols defined in dynamic objects. */
1558 asymbol *elf_data_symbol;
1559 asymbol *elf_text_symbol;
1560 asection *elf_data_section;
1561 asection *elf_text_section;
1563 /* A pointer to the .eh_frame section. */
1564 asection *eh_frame_section;
1566 /* Whether a dyanmic object was specified normally on the linker
1567 command line, or was specified when --as-needed was in effect,
1568 or was found via a DT_NEEDED entry. */
1569 enum dynamic_lib_link_class dyn_lib_class;
1571 /* This is set to TRUE if the object was created by the backend
1575 /* Irix 5 often screws up the symbol table, sorting local symbols
1576 after global symbols. This flag is set if the symbol table in
1577 this BFD appears to be screwed up. If it is, we ignore the
1578 sh_info field in the symbol table header, and always read all the
1580 bfd_boolean bad_symtab;
1582 /* Used to determine if the e_flags field has been initialized */
1583 bfd_boolean flags_init;
1585 /* Symbol buffer. */
1588 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1589 obj_attribute_list *other_obj_attributes[2];
1591 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1592 bfd_boolean (*after_write_object_contents) (bfd *);
1593 void *after_write_object_contents_info;
1595 /* NT_GNU_BUILD_ID note type. */
1596 bfd_size_type build_id_size;
1599 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1600 symbol type. Used to set the osabi field in the ELF header
1602 bfd_boolean has_ifunc_symbols;
1604 /* An identifier used to distinguish different target
1605 specific extensions to this structure. */
1606 enum elf_object_id object_id;
1609 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1611 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1612 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1613 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1614 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1615 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1616 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1617 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1618 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1619 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1620 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1621 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1622 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1623 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1624 #define elf_eh_frame_section(bfd) \
1625 (elf_tdata(bfd) -> eh_frame_section)
1626 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1627 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1628 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1629 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1630 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1631 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1632 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1633 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1634 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1635 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1636 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1637 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1638 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1639 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1640 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1641 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1642 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1643 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1644 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1645 #define elf_known_obj_attributes_proc(bfd) \
1646 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1647 #define elf_other_obj_attributes_proc(bfd) \
1648 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1650 extern void _bfd_elf_swap_verdef_in
1651 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1652 extern void _bfd_elf_swap_verdef_out
1653 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1654 extern void _bfd_elf_swap_verdaux_in
1655 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1656 extern void _bfd_elf_swap_verdaux_out
1657 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1658 extern void _bfd_elf_swap_verneed_in
1659 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1660 extern void _bfd_elf_swap_verneed_out
1661 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1662 extern void _bfd_elf_swap_vernaux_in
1663 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1664 extern void _bfd_elf_swap_vernaux_out
1665 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1666 extern void _bfd_elf_swap_versym_in
1667 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1668 extern void _bfd_elf_swap_versym_out
1669 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1671 extern unsigned int _bfd_elf_section_from_bfd_section
1672 (bfd *, asection *);
1673 extern char *bfd_elf_string_from_elf_section
1674 (bfd *, unsigned, unsigned);
1675 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1676 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1677 Elf_External_Sym_Shndx *);
1678 extern const char *bfd_elf_sym_name
1679 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1681 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1683 extern bfd_boolean _bfd_elf_print_private_bfd_data
1685 extern void bfd_elf_print_symbol
1686 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1688 extern unsigned int _bfd_elf_eh_frame_address_size
1689 (bfd *, asection *);
1690 extern bfd_byte _bfd_elf_encode_eh_address
1691 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1692 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1693 extern bfd_boolean _bfd_elf_can_make_relative
1694 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1696 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1697 (const Elf_Internal_Rela *);
1698 extern bfd_vma _bfd_elf_rela_local_sym
1699 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1700 extern bfd_vma _bfd_elf_rel_local_sym
1701 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1702 extern bfd_vma _bfd_elf_section_offset
1703 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1705 extern unsigned long bfd_elf_hash
1707 extern unsigned long bfd_elf_gnu_hash
1710 extern bfd_reloc_status_type bfd_elf_generic_reloc
1711 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1712 extern bfd_boolean bfd_elf_allocate_object
1713 (bfd *, size_t, enum elf_object_id);
1714 extern bfd_boolean bfd_elf_make_generic_object
1716 extern bfd_boolean bfd_elf_mkcorefile
1718 extern bfd_boolean _bfd_elf_make_section_from_shdr
1719 (bfd *, Elf_Internal_Shdr *, const char *, int);
1720 extern bfd_boolean _bfd_elf_make_section_from_phdr
1721 (bfd *, Elf_Internal_Phdr *, int, const char *);
1722 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1723 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1724 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1726 extern void _bfd_elf_link_hash_copy_indirect
1727 (struct bfd_link_info *, struct elf_link_hash_entry *,
1728 struct elf_link_hash_entry *);
1729 extern void _bfd_elf_link_hash_hide_symbol
1730 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1731 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1732 (struct bfd_link_info *, struct elf_link_hash_entry *);
1733 extern bfd_boolean _bfd_elf_link_hash_table_init
1734 (struct elf_link_hash_table *, bfd *,
1735 struct bfd_hash_entry *(*)
1736 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1738 extern bfd_boolean _bfd_elf_slurp_version_tables
1739 (bfd *, bfd_boolean);
1740 extern bfd_boolean _bfd_elf_merge_sections
1741 (bfd *, struct bfd_link_info *);
1742 extern bfd_boolean _bfd_elf_match_sections_by_type
1743 (bfd *, const asection *, bfd *, const asection *);
1744 extern bfd_boolean bfd_elf_is_group_section
1745 (bfd *, const struct bfd_section *);
1746 extern void _bfd_elf_section_already_linked
1747 (bfd *, struct bfd_section *, struct bfd_link_info *);
1748 extern void bfd_elf_set_group_contents
1749 (bfd *, asection *, void *);
1750 extern asection *_bfd_elf_check_kept_section
1751 (asection *, struct bfd_link_info *);
1752 extern void _bfd_elf_link_just_syms
1753 (asection *, struct bfd_link_info *);
1754 extern void _bfd_elf_copy_link_hash_symbol_type
1755 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1756 extern bfd_boolean _bfd_elf_copy_private_header_data
1758 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1759 (bfd *, asymbol *, bfd *, asymbol *);
1760 #define _bfd_generic_init_private_section_data \
1761 _bfd_elf_init_private_section_data
1762 extern bfd_boolean _bfd_elf_init_private_section_data
1763 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1764 extern bfd_boolean _bfd_elf_copy_private_section_data
1765 (bfd *, asection *, bfd *, asection *);
1766 extern bfd_boolean _bfd_elf_write_object_contents
1768 extern bfd_boolean _bfd_elf_write_corefile_contents
1770 extern bfd_boolean _bfd_elf_set_section_contents
1771 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1772 extern long _bfd_elf_get_symtab_upper_bound
1774 extern long _bfd_elf_canonicalize_symtab
1775 (bfd *, asymbol **);
1776 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1778 extern long _bfd_elf_canonicalize_dynamic_symtab
1779 (bfd *, asymbol **);
1780 extern long _bfd_elf_get_synthetic_symtab
1781 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1782 extern long _bfd_elf_get_reloc_upper_bound
1784 extern long _bfd_elf_canonicalize_reloc
1785 (bfd *, sec_ptr, arelent **, asymbol **);
1786 extern asection * _bfd_elf_get_dynamic_reloc_section
1787 (bfd *, asection *, bfd_boolean);
1788 extern asection * _bfd_elf_make_dynamic_reloc_section
1789 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1790 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1792 extern long _bfd_elf_canonicalize_dynamic_reloc
1793 (bfd *, arelent **, asymbol **);
1794 extern asymbol *_bfd_elf_make_empty_symbol
1796 extern void _bfd_elf_get_symbol_info
1797 (bfd *, asymbol *, symbol_info *);
1798 extern bfd_boolean _bfd_elf_is_local_label_name
1799 (bfd *, const char *);
1800 extern alent *_bfd_elf_get_lineno
1802 extern bfd_boolean _bfd_elf_set_arch_mach
1803 (bfd *, enum bfd_architecture, unsigned long);
1804 extern bfd_boolean _bfd_elf_find_nearest_line
1805 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1807 extern bfd_boolean _bfd_elf_find_line
1808 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1809 #define _bfd_generic_find_line _bfd_elf_find_line
1810 extern bfd_boolean _bfd_elf_find_inliner_info
1811 (bfd *, const char **, const char **, unsigned int *);
1812 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1813 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1814 extern int _bfd_elf_sizeof_headers
1815 (bfd *, struct bfd_link_info *);
1816 extern bfd_boolean _bfd_elf_new_section_hook
1817 (bfd *, asection *);
1818 extern bfd_boolean _bfd_elf_init_reloc_shdr
1819 (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1820 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1821 (const char *, const struct bfd_elf_special_section *, unsigned int);
1822 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1823 (bfd *, asection *);
1825 /* If the target doesn't have reloc handling written yet: */
1826 extern void _bfd_elf_no_info_to_howto
1827 (bfd *, arelent *, Elf_Internal_Rela *);
1829 extern bfd_boolean bfd_section_from_shdr
1830 (bfd *, unsigned int shindex);
1831 extern bfd_boolean bfd_section_from_phdr
1832 (bfd *, Elf_Internal_Phdr *, int);
1834 extern int _bfd_elf_symbol_from_bfd_symbol
1835 (bfd *, asymbol **);
1837 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1838 (struct sym_cache *, bfd *, unsigned long);
1839 extern asection *bfd_section_from_elf_index
1840 (bfd *, unsigned int);
1841 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1844 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1846 extern void _bfd_elf_strtab_free
1847 (struct elf_strtab_hash *);
1848 extern bfd_size_type _bfd_elf_strtab_add
1849 (struct elf_strtab_hash *, const char *, bfd_boolean);
1850 extern void _bfd_elf_strtab_addref
1851 (struct elf_strtab_hash *, bfd_size_type);
1852 extern void _bfd_elf_strtab_delref
1853 (struct elf_strtab_hash *, bfd_size_type);
1854 extern void _bfd_elf_strtab_clear_all_refs
1855 (struct elf_strtab_hash *);
1856 extern bfd_size_type _bfd_elf_strtab_size
1857 (struct elf_strtab_hash *);
1858 extern bfd_size_type _bfd_elf_strtab_offset
1859 (struct elf_strtab_hash *, bfd_size_type);
1860 extern bfd_boolean _bfd_elf_strtab_emit
1861 (bfd *, struct elf_strtab_hash *);
1862 extern void _bfd_elf_strtab_finalize
1863 (struct elf_strtab_hash *);
1865 extern void _bfd_elf_begin_eh_frame_parsing
1866 (struct bfd_link_info *info);
1867 extern void _bfd_elf_parse_eh_frame
1868 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1869 extern void _bfd_elf_end_eh_frame_parsing
1870 (struct bfd_link_info *info);
1872 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1873 (bfd *, struct bfd_link_info *, asection *,
1874 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1875 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1876 (bfd *, struct bfd_link_info *);
1877 extern bfd_vma _bfd_elf_eh_frame_section_offset
1878 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1879 extern bfd_boolean _bfd_elf_write_section_eh_frame
1880 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1881 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1882 (bfd *, struct bfd_link_info *);
1883 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1884 (struct bfd_link_info *);
1886 extern bfd_boolean _bfd_elf_merge_symbol
1887 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1888 asection **, bfd_vma *, unsigned int *,
1889 struct elf_link_hash_entry **, bfd_boolean *,
1890 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1892 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1894 extern long _bfd_elf_link_lookup_local_dynindx
1895 (struct bfd_link_info *, bfd *, long);
1896 extern bfd_boolean _bfd_elf_compute_section_file_positions
1897 (bfd *, struct bfd_link_info *);
1898 extern void _bfd_elf_assign_file_positions_for_relocs
1900 extern file_ptr _bfd_elf_assign_file_position_for_section
1901 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1903 extern bfd_boolean _bfd_elf_validate_reloc
1906 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1907 (bfd *, struct bfd_link_info *);
1908 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1909 (bfd *, struct bfd_link_info *, asection *);
1910 extern bfd_boolean _bfd_elf_create_dynamic_sections
1911 (bfd *, struct bfd_link_info *);
1912 extern bfd_boolean _bfd_elf_create_got_section
1913 (bfd *, struct bfd_link_info *);
1914 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1915 (bfd *, struct bfd_link_info *, asection *, const char *);
1916 extern void _bfd_elf_init_1_index_section
1917 (bfd *, struct bfd_link_info *);
1918 extern void _bfd_elf_init_2_index_sections
1919 (bfd *, struct bfd_link_info *);
1921 extern bfd_boolean _bfd_elfcore_make_pseudosection
1922 (bfd *, char *, size_t, ufile_ptr);
1923 extern char *_bfd_elfcore_strndup
1924 (bfd *, char *, size_t);
1926 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1927 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1929 extern bfd_boolean _bfd_elf_link_output_relocs
1930 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1931 struct elf_link_hash_entry **);
1933 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
1934 (struct elf_link_hash_entry *, asection *);
1936 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1937 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1939 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1940 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1942 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
1943 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
1945 extern bfd_boolean _bfd_elf_setup_sections
1948 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
1950 extern const bfd_target *bfd_elf32_object_p
1952 extern const bfd_target *bfd_elf32_core_file_p
1954 extern char *bfd_elf32_core_file_failing_command
1956 extern int bfd_elf32_core_file_failing_signal
1958 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1961 extern bfd_boolean bfd_elf32_swap_symbol_in
1962 (bfd *, const void *, const void *, Elf_Internal_Sym *);
1963 extern void bfd_elf32_swap_symbol_out
1964 (bfd *, const Elf_Internal_Sym *, void *, void *);
1965 extern void bfd_elf32_swap_reloc_in
1966 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1967 extern void bfd_elf32_swap_reloc_out
1968 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1969 extern void bfd_elf32_swap_reloca_in
1970 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1971 extern void bfd_elf32_swap_reloca_out
1972 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1973 extern void bfd_elf32_swap_phdr_in
1974 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
1975 extern void bfd_elf32_swap_phdr_out
1976 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
1977 extern void bfd_elf32_swap_dyn_in
1978 (bfd *, const void *, Elf_Internal_Dyn *);
1979 extern void bfd_elf32_swap_dyn_out
1980 (bfd *, const Elf_Internal_Dyn *, void *);
1981 extern long bfd_elf32_slurp_symbol_table
1982 (bfd *, asymbol **, bfd_boolean);
1983 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
1985 extern int bfd_elf32_write_out_phdrs
1986 (bfd *, const Elf_Internal_Phdr *, unsigned int);
1987 extern bfd_boolean bfd_elf32_checksum_contents
1988 (bfd * , void (*) (const void *, size_t, void *), void *);
1989 extern void bfd_elf32_write_relocs
1990 (bfd *, asection *, void *);
1991 extern bfd_boolean bfd_elf32_slurp_reloc_table
1992 (bfd *, asection *, asymbol **, bfd_boolean);
1994 extern const bfd_target *bfd_elf64_object_p
1996 extern const bfd_target *bfd_elf64_core_file_p
1998 extern char *bfd_elf64_core_file_failing_command
2000 extern int bfd_elf64_core_file_failing_signal
2002 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2005 extern bfd_boolean bfd_elf64_swap_symbol_in
2006 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2007 extern void bfd_elf64_swap_symbol_out
2008 (bfd *, const Elf_Internal_Sym *, void *, void *);
2009 extern void bfd_elf64_swap_reloc_in
2010 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2011 extern void bfd_elf64_swap_reloc_out
2012 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2013 extern void bfd_elf64_swap_reloca_in
2014 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2015 extern void bfd_elf64_swap_reloca_out
2016 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2017 extern void bfd_elf64_swap_phdr_in
2018 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2019 extern void bfd_elf64_swap_phdr_out
2020 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2021 extern void bfd_elf64_swap_dyn_in
2022 (bfd *, const void *, Elf_Internal_Dyn *);
2023 extern void bfd_elf64_swap_dyn_out
2024 (bfd *, const Elf_Internal_Dyn *, void *);
2025 extern long bfd_elf64_slurp_symbol_table
2026 (bfd *, asymbol **, bfd_boolean);
2027 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2029 extern int bfd_elf64_write_out_phdrs
2030 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2031 extern bfd_boolean bfd_elf64_checksum_contents
2032 (bfd * , void (*) (const void *, size_t, void *), void *);
2033 extern void bfd_elf64_write_relocs
2034 (bfd *, asection *, void *);
2035 extern bfd_boolean bfd_elf64_slurp_reloc_table
2036 (bfd *, asection *, asymbol **, bfd_boolean);
2038 extern bfd_boolean _bfd_elf_default_relocs_compatible
2039 (const bfd_target *, const bfd_target *);
2041 extern bfd_boolean _bfd_elf_relocs_compatible
2042 (const bfd_target *, const bfd_target *);
2044 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2045 (bfd *, struct bfd_link_info *, const char *);
2046 extern bfd_boolean bfd_elf_link_add_symbols
2047 (bfd *, struct bfd_link_info *);
2048 extern bfd_boolean _bfd_elf_add_dynamic_entry
2049 (struct bfd_link_info *, bfd_vma, bfd_vma);
2051 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2052 (struct bfd_link_info *, struct elf_link_hash_entry *);
2054 extern int bfd_elf_link_record_local_dynamic_symbol
2055 (struct bfd_link_info *, bfd *, long);
2057 extern bfd_boolean _bfd_elf_close_and_cleanup
2060 extern bfd_boolean _bfd_elf_common_definition
2061 (Elf_Internal_Sym *);
2063 extern unsigned int _bfd_elf_common_section_index
2066 extern asection *_bfd_elf_common_section
2069 extern void _bfd_dwarf2_cleanup_debug_info
2072 extern bfd_vma _bfd_elf_default_got_elt_size
2073 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2076 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2077 (bfd *, arelent *, struct bfd_symbol *, void *,
2078 asection *, bfd *, char **);
2080 extern bfd_boolean bfd_elf_final_link
2081 (bfd *, struct bfd_link_info *);
2083 extern void _bfd_elf_gc_keep
2084 (struct bfd_link_info *info);
2086 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2087 (struct elf_link_hash_entry *h, void *inf);
2089 extern bfd_boolean bfd_elf_gc_sections
2090 (bfd *, struct bfd_link_info *);
2092 extern bfd_boolean bfd_elf_gc_record_vtinherit
2093 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2095 extern bfd_boolean bfd_elf_gc_record_vtentry
2096 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2098 extern asection *_bfd_elf_gc_mark_hook
2099 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2100 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2102 extern asection *_bfd_elf_gc_mark_rsec
2103 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2104 struct elf_reloc_cookie *);
2106 extern bfd_boolean _bfd_elf_gc_mark_reloc
2107 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2108 struct elf_reloc_cookie *);
2110 extern bfd_boolean _bfd_elf_gc_mark_fdes
2111 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2112 struct elf_reloc_cookie *);
2114 extern bfd_boolean _bfd_elf_gc_mark
2115 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2117 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2118 (bfd *, struct bfd_link_info *);
2120 extern bfd_boolean bfd_elf_gc_common_final_link
2121 (bfd *, struct bfd_link_info *);
2123 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2126 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2127 (bfd *, asection *);
2129 extern bfd_boolean _bfd_elf_map_sections_to_segments
2130 (bfd *, struct bfd_link_info *);
2132 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2134 extern int bfd_elf_get_default_section_type (flagword);
2136 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2137 (bfd * abfd, asection * section);
2139 /* Exported interface for writing elf corefile notes. */
2140 extern char *elfcore_write_note
2141 (bfd *, char *, int *, const char *, int, const void *, int);
2142 extern char *elfcore_write_prpsinfo
2143 (bfd *, char *, int *, const char *, const char *);
2144 extern char *elfcore_write_prstatus
2145 (bfd *, char *, int *, long, int, const void *);
2146 extern char * elfcore_write_pstatus
2147 (bfd *, char *, int *, long, int, const void *);
2148 extern char *elfcore_write_prfpreg
2149 (bfd *, char *, int *, const void *, int);
2150 extern char *elfcore_write_prxfpreg
2151 (bfd *, char *, int *, const void *, int);
2152 extern char *elfcore_write_xstatereg
2153 (bfd *, char *, int *, const void *, int);
2154 extern char *elfcore_write_ppc_vmx
2155 (bfd *, char *, int *, const void *, int);
2156 extern char *elfcore_write_ppc_vsx
2157 (bfd *, char *, int *, const void *, int);
2158 extern char *elfcore_write_lwpstatus
2159 (bfd *, char *, int *, long, int, const void *);
2160 extern char *elfcore_write_register_note
2161 (bfd *, char *, int *, const char *, const void *, int);
2163 extern bfd *_bfd_elf32_bfd_from_remote_memory
2164 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2165 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2166 extern bfd *_bfd_elf64_bfd_from_remote_memory
2167 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2168 int (*target_read_memory) (bfd_vma, bfd_byte *, int));
2170 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2171 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2172 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2173 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2174 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2175 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2176 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2177 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2178 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2179 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2181 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2182 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2185 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2186 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2187 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2188 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2189 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2191 /* The linker may needs to keep track of the number of relocs that it
2192 decides to copy as dynamic relocs in check_relocs for each symbol.
2193 This is so that it can later discard them if they are found to be
2194 unnecessary. We can store the information in a field extending the
2195 regular ELF linker hash table. */
2197 struct elf_dyn_relocs
2199 struct elf_dyn_relocs *next;
2201 /* The input section of the reloc. */
2204 /* Total number of relocs copied for the input section. */
2205 bfd_size_type count;
2207 /* Number of pc-relative relocs copied for the input section. */
2208 bfd_size_type pc_count;
2211 extern bfd_boolean _bfd_elf_create_ifunc_sections
2212 (bfd *, struct bfd_link_info *);
2213 extern asection * _bfd_elf_create_ifunc_dyn_reloc
2214 (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc,
2215 struct elf_dyn_relocs **);
2216 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2217 (struct bfd_link_info *, struct elf_link_hash_entry *,
2218 struct elf_dyn_relocs **, unsigned int, unsigned int);
2220 /* Large common section. */
2221 extern asection _bfd_elf_large_com_section;
2223 /* Hash for local symbol with the first section id, ID, in the input
2224 file and the local symbol index, SYM. */
2225 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2226 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2227 ^ (SYM) ^ ((ID) >> 16))
2229 /* This is the condition under which finish_dynamic_symbol will be called.
2230 If our finish_dynamic_symbol isn't called, we'll need to do something
2231 about initializing any .plt and .got entries in relocate_section. */
2232 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2234 && ((SHARED) || !(H)->forced_local) \
2235 && ((H)->dynindx != -1 || (H)->forced_local))
2237 /* This macro is to avoid lots of duplicated code in the body
2238 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2239 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2240 r_symndx, symtab_hdr, sym_hashes, \
2241 h, sec, relocation, \
2242 unresolved_reloc, warned) \
2245 /* It seems this can happen with erroneous or unsupported \
2246 input (mixing a.out and elf in an archive, for example.) */ \
2247 if (sym_hashes == NULL) \
2250 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2252 while (h->root.type == bfd_link_hash_indirect \
2253 || h->root.type == bfd_link_hash_warning) \
2254 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2257 unresolved_reloc = FALSE; \
2259 if (h->root.type == bfd_link_hash_defined \
2260 || h->root.type == bfd_link_hash_defweak) \
2262 sec = h->root.u.def.section; \
2264 || sec->output_section == NULL) \
2265 /* Set a flag that will be cleared later if we find a \
2266 relocation value for this symbol. output_section \
2267 is typically NULL for symbols satisfied by a shared \
2269 unresolved_reloc = TRUE; \
2271 relocation = (h->root.u.def.value \
2272 + sec->output_section->vma \
2273 + sec->output_offset); \
2275 else if (h->root.type == bfd_link_hash_undefweak) \
2277 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2278 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2280 else if (!info->relocatable) \
2283 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2284 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2285 if (!info->callbacks->undefined_symbol (info, \
2286 h->root.root.string, \
2289 rel->r_offset, err)) \
2296 /* Will a symbol be bound to the the definition within the shared
2298 #define SYMBOLIC_BIND(INFO, H) \
2299 ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic))
2301 #endif /* _LIBELF_H_ */