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, 2010, 2011, 2012
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 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
157 unsigned int target_internal : 8;
159 /* Symbol is referenced by a non-shared object (other than the object
160 in which it is defined). */
161 unsigned int ref_regular : 1;
162 /* Symbol is defined by a non-shared object. */
163 unsigned int def_regular : 1;
164 /* Symbol is referenced by a shared object. */
165 unsigned int ref_dynamic : 1;
166 /* Symbol is defined by a shared object. */
167 unsigned int def_dynamic : 1;
168 /* Symbol has a non-weak reference from a non-shared object (other than
169 the object in which it is defined). */
170 unsigned int ref_regular_nonweak : 1;
171 /* Dynamic symbol has been adjustd. */
172 unsigned int dynamic_adjusted : 1;
173 /* Symbol needs a copy reloc. */
174 unsigned int needs_copy : 1;
175 /* Symbol needs a procedure linkage table entry. */
176 unsigned int needs_plt : 1;
177 /* Symbol appears in a non-ELF input file. */
178 unsigned int non_elf : 1;
179 /* Symbol should be marked as hidden in the version information. */
180 unsigned int hidden : 1;
181 /* Symbol was forced to local scope due to a version script file. */
182 unsigned int forced_local : 1;
183 /* Symbol was forced to be dynamic due to a version script file. */
184 unsigned int dynamic : 1;
185 /* Symbol was marked during garbage collection. */
186 unsigned int mark : 1;
187 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
188 not currently set by all the backends. */
189 unsigned int non_got_ref : 1;
190 /* Symbol has a definition in a shared object.
191 FIXME: There is no real need for this field if def_dynamic is never
192 cleared and all places that test def_dynamic also test def_regular. */
193 unsigned int dynamic_def : 1;
194 /* Symbol is weak in all shared objects. */
195 unsigned int dynamic_weak : 1;
196 /* Symbol is referenced with a relocation where C/C++ pointer equality
198 unsigned int pointer_equality_needed : 1;
199 /* Symbol is a unique global symbol. */
200 unsigned int unique_global : 1;
202 /* String table index in .dynstr if this is a dynamic symbol. */
203 unsigned long dynstr_index;
207 /* If this is a weak defined symbol from a dynamic object, this
208 field points to a defined symbol with the same value, if there is
209 one. Otherwise it is NULL. */
210 struct elf_link_hash_entry *weakdef;
212 /* Hash value of the name computed using the ELF hash function.
213 Used part way through size_dynamic_sections, after we've finished
215 unsigned long elf_hash_value;
218 /* Version information. */
221 /* This field is used for a symbol which is not defined in a
222 regular object. It points to the version information read in
223 from the dynamic object. */
224 Elf_Internal_Verdef *verdef;
225 /* This field is used for a symbol which is defined in a regular
226 object. It is set up in size_dynamic_sections. It points to
227 the version information we should write out for this symbol. */
228 struct bfd_elf_version_tree *vertree;
231 struct elf_link_virtual_table_entry *vtable;
234 /* Will references to this symbol always reference the symbol
236 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
237 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
239 /* Will _calls_ to this symbol always call the version in this object? */
240 #define SYMBOL_CALLS_LOCAL(INFO, H) \
241 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
243 /* Common symbols that are turned into definitions don't have the
244 DEF_REGULAR flag set, so they might appear to be undefined. */
245 #define ELF_COMMON_DEF_P(H) \
247 && !(H)->def_dynamic \
248 && (H)->root.type == bfd_link_hash_defined)
250 /* Records local symbols to be emitted in the dynamic symbol table. */
252 struct elf_link_local_dynamic_entry
254 struct elf_link_local_dynamic_entry *next;
256 /* The input bfd this symbol came from. */
259 /* The index of the local symbol being copied. */
262 /* The index in the outgoing dynamic symbol table. */
265 /* A copy of the input symbol. */
266 Elf_Internal_Sym isym;
269 struct elf_link_loaded_list
271 struct elf_link_loaded_list *next;
275 /* Structures used by the eh_frame optimization code. */
280 /* If REMOVED == 1, this is the CIE that the FDE originally used.
281 The CIE belongs to the same .eh_frame input section as the FDE.
283 If REMOVED == 0, this is the CIE that we have chosen to use for
284 the output FDE. The CIE's REMOVED field is also 0, but the CIE
285 might belong to a different .eh_frame input section from the FDE. */
286 struct eh_cie_fde *cie_inf;
287 struct eh_cie_fde *next_for_section;
290 /* CIEs have three states:
292 - REMOVED && !MERGED: Slated for removal because we haven't yet
293 proven that an FDE needs it. FULL_CIE, if nonnull, points to
294 more detailed information about the CIE.
296 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
297 which may not belong to the same input section.
299 - !REMOVED: We have decided to keep this CIE. SEC is the
300 .eh_frame input section that contains the CIE. */
302 struct cie *full_cie;
303 struct eh_cie_fde *merged_with;
307 /* The offset of the personality data from the start of the CIE,
308 or 0 if the CIE doesn't have any. */
309 unsigned int personality_offset : 8;
311 /* True if we have marked relocations associated with this CIE. */
312 unsigned int gc_mark : 1;
314 /* True if we have decided to turn an absolute LSDA encoding into
315 a PC-relative one. */
316 unsigned int make_lsda_relative : 1;
318 /* True if we have decided to turn an absolute personality
319 encoding into a PC-relative one. */
320 unsigned int make_per_encoding_relative : 1;
322 /* True if the CIE contains personality data and if that
323 data uses a PC-relative encoding. Always true when
324 make_per_encoding_relative is. */
325 unsigned int per_encoding_relative : 1;
327 /* True if we need to add an 'R' (FDE encoding) entry to the
328 CIE's augmentation data. */
329 unsigned int add_fde_encoding : 1;
331 /* True if we have merged this CIE with another. */
332 unsigned int merged : 1;
335 unsigned int pad1 : 18;
338 unsigned int reloc_index;
341 unsigned int new_offset;
342 unsigned int fde_encoding : 8;
343 unsigned int lsda_encoding : 8;
344 unsigned int lsda_offset : 8;
346 /* True if this entry represents a CIE, false if it represents an FDE. */
347 unsigned int cie : 1;
349 /* True if this entry is currently marked for removal. */
350 unsigned int removed : 1;
352 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
353 augmentation data, and an associated byte to each of the CIE's FDEs. */
354 unsigned int add_augmentation_size : 1;
356 /* True if we have decided to convert absolute FDE relocations into
357 relative ones. This applies to the first relocation in the FDE,
358 which is against the code that the FDE describes. */
359 unsigned int make_relative : 1;
362 unsigned int pad1 : 4;
364 unsigned int *set_loc;
367 struct eh_frame_sec_info
371 struct eh_cie_fde entry[1];
374 struct eh_frame_array_ent
382 struct eh_frame_hdr_info
386 unsigned int fde_count, array_count;
387 struct eh_frame_array_ent *array;
388 /* TRUE if we should try to merge CIEs between input sections. */
389 bfd_boolean merge_cies;
390 /* TRUE if all .eh_frames have been parsd. */
391 bfd_boolean parsed_eh_frames;
392 /* TRUE if .eh_frame_hdr should contain the sorted search table.
393 We build it if we successfully read all .eh_frame input sections
394 and recognize them. */
398 /* Enum used to identify target specific extensions to the elf_obj_tdata
399 and elf_link_hash_table structures. Note the enums deliberately start
400 from 1 so that we can detect an uninitialized field. The generic value
401 is last so that additions to this enum do not need to modify more than
437 /* ELF linker hash table. */
439 struct elf_link_hash_table
441 struct bfd_link_hash_table root;
443 /* An identifier used to distinguish different target
444 specific extensions to this structure. */
445 enum elf_target_id hash_table_id;
447 /* Whether we have created the special dynamic sections required
448 when linking against or generating a shared object. */
449 bfd_boolean dynamic_sections_created;
451 /* True if this target has relocatable executables, so needs dynamic
453 bfd_boolean is_relocatable_executable;
455 /* The BFD used to hold special sections created by the linker.
456 This will be the first BFD found which requires these sections to
460 /* The value to use when initialising got.refcount/offset and
461 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
462 the values are refcounts. Set to init_got_offset/init_plt_offset
463 in size_dynamic_sections when the values may be offsets. */
464 union gotplt_union init_got_refcount;
465 union gotplt_union init_plt_refcount;
467 /* The value to use for got.refcount/offset and plt.refcount/offset
468 when the values may be offsets. Normally (bfd_vma) -1. */
469 union gotplt_union init_got_offset;
470 union gotplt_union init_plt_offset;
472 /* The number of symbols found in the link which must be put into
473 the .dynsym section. */
474 bfd_size_type dynsymcount;
476 /* The string table of dynamic symbols, which becomes the .dynstr
478 struct elf_strtab_hash *dynstr;
480 /* The number of buckets in the hash table in the .hash section.
481 This is based on the number of dynamic symbols. */
482 bfd_size_type bucketcount;
484 /* A linked list of DT_NEEDED names found in dynamic objects
485 included in the link. */
486 struct bfd_link_needed_list *needed;
488 /* Sections in the output bfd that provides a section symbol
489 to be used by relocations emitted against local symbols.
490 Most targets will not use data_index_section. */
491 asection *text_index_section;
492 asection *data_index_section;
494 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
495 struct elf_link_hash_entry *hgot;
497 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
498 struct elf_link_hash_entry *hplt;
500 /* A pointer to information used to merge SEC_MERGE sections. */
503 /* Used to link stabs in sections. */
504 struct stab_info stab_info;
506 /* Used by eh_frame code when editing .eh_frame. */
507 struct eh_frame_hdr_info eh_info;
509 /* A linked list of local symbols to be added to .dynsym. */
510 struct elf_link_local_dynamic_entry *dynlocal;
512 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
513 objects included in the link. */
514 struct bfd_link_needed_list *runpath;
516 /* Cached first output tls section and size of PT_TLS segment. */
518 bfd_size_type tls_size;
520 /* A linked list of BFD's loaded in the link. */
521 struct elf_link_loaded_list *loaded;
523 /* Short-cuts to get to dynamic linker sections. */
535 /* Look up an entry in an ELF linker hash table. */
537 #define elf_link_hash_lookup(table, string, create, copy, follow) \
538 ((struct elf_link_hash_entry *) \
539 bfd_link_hash_lookup (&(table)->root, (string), (create), \
542 /* Traverse an ELF linker hash table. */
544 #define elf_link_hash_traverse(table, func, info) \
545 (bfd_link_hash_traverse \
547 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
550 /* Get the ELF linker hash table from a link_info structure. */
552 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
554 #define elf_hash_table_id(table) ((table) -> hash_table_id)
556 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
557 #define is_elf_hash_table(htab) \
558 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
560 /* Used by bfd_sym_from_r_symndx to cache a small number of local
562 #define LOCAL_SYM_CACHE_SIZE 32
566 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
567 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
570 /* Constant information held for an ELF backend. */
572 struct elf_size_info {
573 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
574 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
576 /* The size of entries in the .hash section. */
577 unsigned char sizeof_hash_entry;
579 /* The number of internal relocations to allocate per external
581 unsigned char int_rels_per_ext_rel;
582 /* We use some fixed size arrays. This should be large enough to
583 handle all back-ends. */
584 #define MAX_INT_RELS_PER_EXT_REL 3
586 unsigned char arch_size, log_file_align;
587 unsigned char elfclass, ev_current;
588 int (*write_out_phdrs)
589 (bfd *, const Elf_Internal_Phdr *, unsigned int);
591 (*write_shdrs_and_ehdr) (bfd *);
592 bfd_boolean (*checksum_contents)
593 (bfd * , void (*) (const void *, size_t, void *), void *);
595 (bfd *, asection *, void *);
596 bfd_boolean (*swap_symbol_in)
597 (bfd *, const void *, const void *, Elf_Internal_Sym *);
598 void (*swap_symbol_out)
599 (bfd *, const Elf_Internal_Sym *, void *, void *);
600 bfd_boolean (*slurp_reloc_table)
601 (bfd *, asection *, asymbol **, bfd_boolean);
602 long (*slurp_symbol_table)
603 (bfd *, asymbol **, bfd_boolean);
605 (bfd *, const void *, Elf_Internal_Dyn *);
607 (bfd *, const Elf_Internal_Dyn *, void *);
609 /* This function is called to swap in a REL relocation. If an
610 external relocation corresponds to more than one internal
611 relocation, then all relocations are swapped in at once. */
612 void (*swap_reloc_in)
613 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
615 /* This function is called to swap out a REL relocation. */
616 void (*swap_reloc_out)
617 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
619 /* This function is called to swap in a RELA relocation. If an
620 external relocation corresponds to more than one internal
621 relocation, then all relocations are swapped in at once. */
622 void (*swap_reloca_in)
623 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
625 /* This function is called to swap out a RELA relocation. */
626 void (*swap_reloca_out)
627 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
630 #define elf_symbol_from(ABFD,S) \
631 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
632 && (S)->the_bfd->tdata.elf_obj_data != 0) \
633 ? (elf_symbol_type *) (S) \
636 enum elf_reloc_type_class {
638 reloc_class_relative,
643 struct elf_reloc_cookie
645 Elf_Internal_Rela *rels, *rel, *relend;
646 Elf_Internal_Sym *locsyms;
650 struct elf_link_hash_entry **sym_hashes;
652 bfd_boolean bad_symtab;
655 /* The level of IRIX compatibility we're striving for. */
663 /* Mapping of ELF section names and types. */
664 struct bfd_elf_special_section
668 /* 0 means name must match PREFIX exactly.
669 -1 means name must start with PREFIX followed by an arbitrary string.
670 -2 means name must match PREFIX exactly or consist of PREFIX followed
671 by a dot then anything.
672 > 0 means name must start with the first PREFIX_LENGTH chars of
673 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
679 enum action_discarded
685 typedef asection * (*elf_gc_mark_hook_fn)
686 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
687 struct elf_link_hash_entry *, Elf_Internal_Sym *);
689 struct elf_backend_data
691 /* The architecture for this backend. */
692 enum bfd_architecture arch;
694 /* An identifier used to distinguish different target specific
695 extensions to elf_obj_tdata and elf_link_hash_table structures. */
696 enum elf_target_id target_id;
698 /* The ELF machine code (EM_xxxx) for this backend. */
699 int elf_machine_code;
704 /* The maximum page size for this backend. */
707 /* The minimum page size for this backend. An input object will not be
708 considered page aligned unless its sections are correctly aligned for
709 pages at least this large. May be smaller than maxpagesize. */
712 /* The common page size for this backend. */
713 bfd_vma commonpagesize;
715 /* The BFD flags applied to sections created for dynamic linking. */
716 flagword dynamic_sec_flags;
718 /* Architecture-specific data for this backend.
719 This is actually a pointer to some type like struct elf_ARCH_data. */
720 const void *arch_data;
722 /* A function to translate an ELF RELA relocation to a BFD arelent
724 void (*elf_info_to_howto)
725 (bfd *, arelent *, Elf_Internal_Rela *);
727 /* A function to translate an ELF REL relocation to a BFD arelent
729 void (*elf_info_to_howto_rel)
730 (bfd *, arelent *, Elf_Internal_Rela *);
732 /* A function to determine whether a symbol is global when
733 partitioning the symbol table into local and global symbols.
734 This should be NULL for most targets, in which case the correct
735 thing will be done. MIPS ELF, at least on the Irix 5, has
736 special requirements. */
737 bfd_boolean (*elf_backend_sym_is_global)
740 /* The remaining functions are hooks which are called only if they
743 /* A function to permit a backend specific check on whether a
744 particular BFD format is relevant for an object file, and to
745 permit the backend to set any global information it wishes. When
746 this is called elf_elfheader is set, but anything else should be
747 used with caution. If this returns FALSE, the check_format
748 routine will return a bfd_error_wrong_format error. */
749 bfd_boolean (*elf_backend_object_p)
752 /* A function to do additional symbol processing when reading the
753 ELF symbol table. This is where any processor-specific special
754 section indices are handled. */
755 void (*elf_backend_symbol_processing)
758 /* A function to do additional symbol processing after reading the
759 entire ELF symbol table. */
760 bfd_boolean (*elf_backend_symbol_table_processing)
761 (bfd *, elf_symbol_type *, unsigned int);
763 /* A function to set the type of the info field. Processor-specific
764 types should be handled here. */
765 int (*elf_backend_get_symbol_type)
766 (Elf_Internal_Sym *, int);
768 /* A function to return the linker hash table entry of a symbol that
769 might be satisfied by an archive symbol. */
770 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
771 (bfd *, struct bfd_link_info *, const char *);
773 /* Return true if local section symbols should have a non-null st_name.
774 NULL implies false. */
775 bfd_boolean (*elf_backend_name_local_section_symbols)
778 /* A function to do additional processing on the ELF section header
779 just before writing it out. This is used to set the flags and
780 type fields for some sections, or to actually write out data for
782 bfd_boolean (*elf_backend_section_processing)
783 (bfd *, Elf_Internal_Shdr *);
785 /* A function to handle unusual section types when creating BFD
786 sections from ELF sections. */
787 bfd_boolean (*elf_backend_section_from_shdr)
788 (bfd *, Elf_Internal_Shdr *, const char *, int);
790 /* A function to convert machine dependent ELF section header flags to
791 BFD internal section header flags. */
792 bfd_boolean (*elf_backend_section_flags)
793 (flagword *, const Elf_Internal_Shdr *);
795 /* A function that returns a struct containing ELF section flags and
796 type for the given BFD section. */
797 const struct bfd_elf_special_section * (*get_sec_type_attr)
800 /* A function to handle unusual program segment types when creating BFD
801 sections from ELF program segments. */
802 bfd_boolean (*elf_backend_section_from_phdr)
803 (bfd *, Elf_Internal_Phdr *, int, const char *);
805 /* A function to set up the ELF section header for a BFD section in
806 preparation for writing it out. This is where the flags and type
807 fields are set for unusual sections. */
808 bfd_boolean (*elf_backend_fake_sections)
809 (bfd *, Elf_Internal_Shdr *, asection *);
811 /* A function to get the ELF section index for a BFD section. If
812 this returns TRUE, the section was found. If it is a normal ELF
813 section, *RETVAL should be left unchanged. If it is not a normal
814 ELF section *RETVAL should be set to the SHN_xxxx index. */
815 bfd_boolean (*elf_backend_section_from_bfd_section)
816 (bfd *, asection *, int *retval);
818 /* If this field is not NULL, it is called by the add_symbols phase
819 of a link just before adding a symbol to the global linker hash
820 table. It may modify any of the fields as it wishes. If *NAME
821 is set to NULL, the symbol will be skipped rather than being
822 added to the hash table. This function is responsible for
823 handling all processor dependent symbol bindings and section
824 indices, and must set at least *FLAGS and *SEC for each processor
825 dependent case; failure to do so will cause a link error. */
826 bfd_boolean (*elf_add_symbol_hook)
827 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
828 const char **name, flagword *flags, asection **sec, bfd_vma *value);
830 /* If this field is not NULL, it is called by the elf_link_output_sym
831 phase of a link for each symbol which will appear in the object file.
832 On error, this function returns 0. 1 is returned when the symbol
833 should be output, 2 is returned when the symbol should be discarded. */
834 int (*elf_backend_link_output_symbol_hook)
835 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
836 asection *, struct elf_link_hash_entry *);
838 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
839 linker the first time it encounters a dynamic object in the link.
840 This function must create any sections required for dynamic
841 linking. The ABFD argument is a dynamic object. The .interp,
842 .dynamic, .dynsym, .dynstr, and .hash functions have already been
843 created, and this function may modify the section flags if
844 desired. This function will normally create the .got and .plt
845 sections, but different backends have different requirements. */
846 bfd_boolean (*elf_backend_create_dynamic_sections)
847 (bfd *abfd, struct bfd_link_info *info);
849 /* When creating a shared library, determine whether to omit the
850 dynamic symbol for the section. */
851 bfd_boolean (*elf_backend_omit_section_dynsym)
852 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
854 /* Return TRUE if relocations of targets are compatible to the extent
855 that CHECK_RELOCS will properly process them. PR 4424. */
856 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
858 /* The CHECK_RELOCS function is called by the add_symbols phase of
859 the ELF backend linker. It is called once for each section with
860 relocs of an object file, just after the symbols for the object
861 file have been added to the global linker hash table. The
862 function must look through the relocs and do any special handling
863 required. This generally means allocating space in the global
864 offset table, and perhaps allocating space for a reloc. The
865 relocs are always passed as Rela structures; if the section
866 actually uses Rel structures, the r_addend field will always be
868 bfd_boolean (*check_relocs)
869 (bfd *abfd, struct bfd_link_info *info, asection *o,
870 const Elf_Internal_Rela *relocs);
872 /* The CHECK_DIRECTIVES function is called once per input file by
873 the add_symbols phase of the ELF backend linker. The function
874 must inspect the bfd and create any additional symbols according
875 to any custom directives in the bfd. */
876 bfd_boolean (*check_directives)
877 (bfd *abfd, struct bfd_link_info *info);
879 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
880 input file that was not needed by the add_symbols phase of the
881 ELF backend linker. The function must undo any target specific
882 changes in the symbol hash table. */
883 bfd_boolean (*as_needed_cleanup)
884 (bfd *abfd, struct bfd_link_info *info);
886 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
887 linker for every symbol which is defined by a dynamic object and
888 referenced by a regular object. This is called after all the
889 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
890 function has been called. The hash table entry should be
891 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
892 defined in a section from a dynamic object. Dynamic object
893 sections are not included in the final link, and this function is
894 responsible for changing the value to something which the rest of
895 the link can deal with. This will normally involve adding an
896 entry to the .plt or .got or some such section, and setting the
897 symbol to point to that. */
898 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
899 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
901 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
902 after all the linker input files have been seen but before the
903 section sizes have been set. This is called after
904 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
905 bfd_boolean (*elf_backend_always_size_sections)
906 (bfd *output_bfd, struct bfd_link_info *info);
908 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
909 linker after all the linker input files have been seen but before
910 the sections sizes have been set. This is called after
911 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
912 It is only called when linking against a dynamic object. It must
913 set the sizes of the dynamic sections, and may fill in their
914 contents as well. The generic ELF linker can handle the .dynsym,
915 .dynstr and .hash sections. This function must handle the
916 .interp section and any sections created by the
917 CREATE_DYNAMIC_SECTIONS entry point. */
918 bfd_boolean (*elf_backend_size_dynamic_sections)
919 (bfd *output_bfd, struct bfd_link_info *info);
921 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
922 we keep to use as a base for relocs and symbols. */
923 void (*elf_backend_init_index_section)
924 (bfd *output_bfd, struct bfd_link_info *info);
926 /* The RELOCATE_SECTION function is called by the ELF backend linker
927 to handle the relocations for a section.
929 The relocs are always passed as Rela structures; if the section
930 actually uses Rel structures, the r_addend field will always be
933 This function is responsible for adjust the section contents as
934 necessary, and (if using Rela relocs and generating a
935 relocatable output file) adjusting the reloc addend as
938 This function does not have to worry about setting the reloc
939 address or the reloc symbol index.
941 LOCAL_SYMS is a pointer to the swapped in local symbols.
943 LOCAL_SECTIONS is an array giving the section in the input file
944 corresponding to the st_shndx field of each local symbol.
946 The global hash table entry for the global symbols can be found
947 via elf_sym_hashes (input_bfd).
949 When generating relocatable output, this function must handle
950 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
951 going to be the section symbol corresponding to the output
952 section, which means that the addend must be adjusted
955 Returns FALSE on error, TRUE on success, 2 if successful and
956 relocations should be written for this section. */
957 int (*elf_backend_relocate_section)
958 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
959 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
960 Elf_Internal_Sym *local_syms, asection **local_sections);
962 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
963 linker just before it writes a symbol out to the .dynsym section.
964 The processor backend may make any required adjustment to the
965 symbol. It may also take the opportunity to set contents of the
966 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
967 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
968 on those symbols which are defined by a dynamic object. */
969 bfd_boolean (*elf_backend_finish_dynamic_symbol)
970 (bfd *output_bfd, struct bfd_link_info *info,
971 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
973 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
974 linker just before it writes all the dynamic sections out to the
975 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
976 all dynamic symbols. */
977 bfd_boolean (*elf_backend_finish_dynamic_sections)
978 (bfd *output_bfd, struct bfd_link_info *info);
980 /* A function to do any beginning processing needed for the ELF file
981 before building the ELF headers and computing file positions. */
982 void (*elf_backend_begin_write_processing)
983 (bfd *, struct bfd_link_info *);
985 /* A function to do any final processing needed for the ELF file
986 before writing it out. The LINKER argument is TRUE if this BFD
987 was created by the ELF backend linker. */
988 void (*elf_backend_final_write_processing)
989 (bfd *, bfd_boolean linker);
991 /* This function is called by get_program_header_size. It should
992 return the number of additional program segments which this BFD
993 will need. It should return -1 on error. */
994 int (*elf_backend_additional_program_headers)
995 (bfd *, struct bfd_link_info *);
997 /* This function is called to modify an existing segment map in a
998 backend specific fashion. */
999 bfd_boolean (*elf_backend_modify_segment_map)
1000 (bfd *, struct bfd_link_info *);
1002 /* This function is called to modify program headers just before
1003 they are written. */
1004 bfd_boolean (*elf_backend_modify_program_headers)
1005 (bfd *, struct bfd_link_info *);
1007 /* This function is called before section garbage collection to
1008 mark entry symbol sections. */
1010 (struct bfd_link_info *);
1012 /* This function is called during section garbage collection to
1013 mark sections that define global symbols. */
1014 bfd_boolean (*gc_mark_dynamic_ref)
1015 (struct elf_link_hash_entry *, void *);
1017 /* This function is called during section gc to discover the section a
1018 particular relocation refers to. */
1019 elf_gc_mark_hook_fn gc_mark_hook;
1021 /* This function, if defined, is called after the first gc marking pass
1022 to allow the backend to mark additional sections. */
1023 bfd_boolean (*gc_mark_extra_sections)
1024 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1026 /* This function, if defined, is called during the sweep phase of gc
1027 in order that a backend might update any data structures it might
1029 bfd_boolean (*gc_sweep_hook)
1030 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1032 /* This function, if defined, is called after the ELF headers have
1033 been created. This allows for things like the OS and ABI versions
1035 void (*elf_backend_post_process_headers)
1036 (bfd *, struct bfd_link_info *);
1038 /* This function, if defined, prints a symbol to file and returns the
1039 name of the symbol to be printed. It should return NULL to fall
1040 back to default symbol printing. */
1041 const char *(*elf_backend_print_symbol_all)
1042 (bfd *, void *, asymbol *);
1044 /* This function, if defined, is called after all local symbols and
1045 global symbols converted to locals are emitted into the symtab
1046 section. It allows the backend to emit special local symbols
1047 not handled in the hash table. */
1048 bfd_boolean (*elf_backend_output_arch_local_syms)
1049 (bfd *, struct bfd_link_info *, void *,
1050 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1051 struct elf_link_hash_entry *));
1053 /* This function, if defined, is called after all symbols are emitted
1054 into the symtab section. It allows the backend to emit special
1055 global symbols not handled in the hash table. */
1056 bfd_boolean (*elf_backend_output_arch_syms)
1057 (bfd *, struct bfd_link_info *, void *,
1058 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1059 struct elf_link_hash_entry *));
1061 /* Copy any information related to dynamic linking from a pre-existing
1062 symbol to a newly created symbol. Also called to copy flags and
1063 other back-end info to a weakdef, in which case the symbol is not
1064 newly created and plt/got refcounts and dynamic indices should not
1066 void (*elf_backend_copy_indirect_symbol)
1067 (struct bfd_link_info *, struct elf_link_hash_entry *,
1068 struct elf_link_hash_entry *);
1070 /* Modify any information related to dynamic linking such that the
1071 symbol is not exported. */
1072 void (*elf_backend_hide_symbol)
1073 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1075 /* A function to do additional symbol fixup, called by
1076 _bfd_elf_fix_symbol_flags. */
1077 bfd_boolean (*elf_backend_fixup_symbol)
1078 (struct bfd_link_info *, struct elf_link_hash_entry *);
1080 /* Merge the backend specific symbol attribute. */
1081 void (*elf_backend_merge_symbol_attribute)
1082 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1085 /* This function, if defined, will return a string containing the
1086 name of a target-specific dynamic tag. */
1087 char *(*elf_backend_get_target_dtag)
1090 /* Decide whether an undefined symbol is special and can be ignored.
1091 This is the case for OPTIONAL symbols on IRIX. */
1092 bfd_boolean (*elf_backend_ignore_undef_symbol)
1093 (struct elf_link_hash_entry *);
1095 /* Emit relocations. Overrides default routine for emitting relocs,
1096 except during a relocatable link, or if all relocs are being emitted. */
1097 bfd_boolean (*elf_backend_emit_relocs)
1098 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1099 struct elf_link_hash_entry **);
1101 /* Count relocations. Not called for relocatable links
1102 or if all relocs are being preserved in the output. */
1103 unsigned int (*elf_backend_count_relocs)
1104 (struct bfd_link_info *, asection *);
1106 /* This function, if defined, is called when an NT_PRSTATUS note is found
1108 bfd_boolean (*elf_backend_grok_prstatus)
1109 (bfd *, Elf_Internal_Note *);
1111 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1112 note is found in a core file. */
1113 bfd_boolean (*elf_backend_grok_psinfo)
1114 (bfd *, Elf_Internal_Note *);
1116 /* This function, if defined, is called to write a note to a corefile. */
1117 char *(*elf_backend_write_core_note)
1118 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1120 /* This function, if defined, is called to convert target-specific
1121 section flag names into hex values. */
1122 flagword (*elf_backend_lookup_section_flags_hook)
1125 /* This function returns class of a reloc type. */
1126 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1127 (const Elf_Internal_Rela *);
1129 /* This function, if defined, removes information about discarded functions
1130 from other sections which mention them. */
1131 bfd_boolean (*elf_backend_discard_info)
1132 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1134 /* This function, if defined, signals that the function above has removed
1135 the discarded relocations for this section. */
1136 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1139 /* What to do when ld finds relocations against symbols defined in
1140 discarded sections. */
1141 unsigned int (*action_discarded)
1144 /* This function returns the width of FDE pointers in bytes, or 0 if
1145 that can't be determined for some reason. The default definition
1146 goes by the bfd's EI_CLASS. */
1147 unsigned int (*elf_backend_eh_frame_address_size)
1148 (bfd *, asection *);
1150 /* These functions tell elf-eh-frame whether to attempt to turn
1151 absolute or lsda encodings into pc-relative ones. The default
1152 definition enables these transformations. */
1153 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1154 (bfd *, struct bfd_link_info *, asection *);
1155 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1156 (bfd *, struct bfd_link_info *, asection *);
1158 /* This function returns an encoding after computing the encoded
1159 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1160 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1161 The default definition chooses a 32-bit PC-relative encoding. */
1162 bfd_byte (*elf_backend_encode_eh_address)
1163 (bfd *abfd, struct bfd_link_info *info,
1164 asection *osec, bfd_vma offset,
1165 asection *loc_sec, bfd_vma loc_offset,
1168 /* This function, if defined, may write out the given section.
1169 Returns TRUE if it did so and FALSE if the caller should. */
1170 bfd_boolean (*elf_backend_write_section)
1171 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1173 /* The level of IRIX compatibility we're striving for.
1174 MIPS ELF specific function. */
1175 irix_compat_t (*elf_backend_mips_irix_compat)
1178 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1179 (unsigned int, bfd_boolean);
1181 /* The swapping table to use when dealing with ECOFF information.
1182 Used for the MIPS ELF .mdebug section. */
1183 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1185 /* This function implements `bfd_elf_bfd_from_remote_memory';
1186 see elf.c, elfcode.h. */
1187 bfd *(*elf_backend_bfd_from_remote_memory)
1188 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1189 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1190 bfd_size_type len));
1192 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1194 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1196 /* Is symbol defined in common section? */
1197 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1199 /* Return a common section index for section. */
1200 unsigned int (*common_section_index) (asection *);
1202 /* Return a common section for section. */
1203 asection *(*common_section) (asection *);
1205 /* Return TRUE if we can merge 2 definitions. */
1206 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1207 struct elf_link_hash_entry **,
1208 struct elf_link_hash_entry *,
1209 Elf_Internal_Sym *, asection **,
1210 bfd_vma *, unsigned int *,
1211 bfd_boolean *, bfd_boolean *,
1212 bfd_boolean *, bfd_boolean *,
1213 bfd_boolean *, bfd_boolean *,
1214 bfd_boolean *, bfd_boolean *,
1216 bfd_boolean *, bfd_boolean *,
1217 bfd_boolean *, bfd_boolean *,
1218 bfd *, asection **);
1220 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1221 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1223 /* Return TRUE if type is a function symbol type. */
1224 bfd_boolean (*is_function_type) (unsigned int type);
1226 /* If the ELF symbol SYM might be a function in SEC, return the
1227 function size and set *CODE_OFF to the function's entry point,
1228 otherwise return zero. */
1229 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1232 /* Used to handle bad SHF_LINK_ORDER input. */
1233 bfd_error_handler_type link_order_error_handler;
1235 /* Name of the PLT relocation section. */
1236 const char *relplt_name;
1238 /* Alternate EM_xxxx machine codes for this backend. */
1239 int elf_machine_alt1;
1240 int elf_machine_alt2;
1242 const struct elf_size_info *s;
1244 /* An array of target specific special sections. */
1245 const struct bfd_elf_special_section *special_sections;
1247 /* The size in bytes of the header for the GOT. This includes the
1248 so-called reserved entries on some systems. */
1249 bfd_vma got_header_size;
1251 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1252 otherwise by the local symbol with index SYMNDX in IBFD. */
1253 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1254 struct elf_link_hash_entry *h,
1255 bfd *ibfd, unsigned long symndx);
1257 /* The vendor name to use for a processor-standard attributes section. */
1258 const char *obj_attrs_vendor;
1260 /* The section name to use for a processor-standard attributes section. */
1261 const char *obj_attrs_section;
1263 /* Return 1, 2 or 3 to indicate what type of arguments a
1264 processor-specific tag takes. */
1265 int (*obj_attrs_arg_type) (int);
1267 /* The section type to use for an attributes section. */
1268 unsigned int obj_attrs_section_type;
1270 /* This function determines the order in which any attributes are
1271 written. It must be defined for input in the range
1272 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1273 is used in order to make unity easy). The returned value is the
1274 actual tag number to place in the input position. */
1275 int (*obj_attrs_order) (int);
1277 /* Handle merging unknown attributes; either warn and return TRUE,
1278 or give an error and return FALSE. */
1279 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1281 /* This is non-zero if static TLS segments require a special alignment. */
1282 unsigned static_tls_alignment;
1284 /* This is TRUE if the linker should act like collect and gather
1285 global constructors and destructors by name. This is TRUE for
1286 MIPS ELF because the Irix 5 tools can not handle the .init
1288 unsigned collect : 1;
1290 /* This is TRUE if the linker should ignore changes to the type of a
1291 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1292 record undefined functions as STT_OBJECT although the definitions
1294 unsigned type_change_ok : 1;
1296 /* Whether the backend may use REL relocations. (Some backends use
1297 both REL and RELA relocations, and this flag is set for those
1299 unsigned may_use_rel_p : 1;
1301 /* Whether the backend may use RELA relocations. (Some backends use
1302 both REL and RELA relocations, and this flag is set for those
1304 unsigned may_use_rela_p : 1;
1306 /* Whether the default relocation type is RELA. If a backend with
1307 this flag set wants REL relocations for a particular section,
1308 it must note that explicitly. Similarly, if this flag is clear,
1309 and the backend wants RELA relocations for a particular
1311 unsigned default_use_rela_p : 1;
1313 /* True if PLT and copy relocations should be RELA by default. */
1314 unsigned rela_plts_and_copies_p : 1;
1316 /* Set if RELA relocations for a relocatable link can be handled by
1317 generic code. Backends that set this flag need do nothing in the
1318 backend relocate_section routine for relocatable linking. */
1319 unsigned rela_normal : 1;
1321 /* TRUE if addresses "naturally" sign extend. This is used when
1322 swapping in from Elf32 when BFD64. */
1323 unsigned sign_extend_vma : 1;
1325 unsigned want_got_plt : 1;
1326 unsigned plt_readonly : 1;
1327 unsigned want_plt_sym : 1;
1328 unsigned plt_not_loaded : 1;
1329 unsigned plt_alignment : 4;
1330 unsigned can_gc_sections : 1;
1331 unsigned can_refcount : 1;
1332 unsigned want_got_sym : 1;
1333 unsigned want_dynbss : 1;
1335 /* Targets which do not support physical addressing often require
1336 that the p_paddr field in the section header to be set to zero.
1337 This field indicates whether this behavior is required. */
1338 unsigned want_p_paddr_set_to_zero : 1;
1340 /* True if an object file lacking a .note.GNU-stack section
1341 should be assumed to be requesting exec stack. At least one
1342 other file in the link needs to have a .note.GNU-stack section
1343 for a PT_GNU_STACK segment to be created. */
1344 unsigned default_execstack : 1;
1347 /* Information about reloc sections associated with a bfd_elf_section_data
1349 struct bfd_elf_section_reloc_data
1351 /* The ELF header for the reloc section associated with this
1353 Elf_Internal_Shdr *hdr;
1354 /* The number of relocations currently assigned to HDR. */
1356 /* The ELF section number of the reloc section. Only used for an
1359 /* Used by the backend linker to store the symbol hash table entries
1360 associated with relocs against global symbols. */
1361 struct elf_link_hash_entry **hashes;
1364 /* Information stored for each BFD section in an ELF file. This
1365 structure is allocated by elf_new_section_hook. */
1367 struct bfd_elf_section_data
1369 /* The ELF header for this section. */
1370 Elf_Internal_Shdr this_hdr;
1372 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1373 struct flag_info *section_flag_info;
1375 /* Information about the REL and RELA reloc sections associated
1376 with this section, if any. */
1377 struct bfd_elf_section_reloc_data rel, rela;
1379 /* The ELF section number of this section. */
1382 /* Used by the backend linker when generating a shared library to
1383 record the dynamic symbol index for a section symbol
1384 corresponding to this section. A value of 0 means that there is
1385 no dynamic symbol for this section. */
1388 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1389 asection *linked_to;
1391 /* A pointer to the swapped relocs. If the section uses REL relocs,
1392 rather than RELA, all the r_addend fields will be zero. This
1393 pointer may be NULL. It is used by the backend linker. */
1394 Elf_Internal_Rela *relocs;
1396 /* A pointer to a linked list tracking dynamic relocs copied for
1400 /* A pointer to the bfd section used for dynamic relocs. */
1404 /* Group name, if this section is a member of a group. */
1407 /* Group signature sym, if this is the SHT_GROUP section. */
1408 struct bfd_symbol *id;
1411 /* For a member of a group, points to the SHT_GROUP section.
1412 NULL for the SHT_GROUP section itself and non-group sections. */
1413 asection *sec_group;
1415 /* A linked list of member sections in the group. Circular when used by
1416 the linker. For the SHT_GROUP section, points at first member. */
1417 asection *next_in_group;
1419 /* The FDEs associated with this section. The u.fde.next_in_section
1420 field acts as a chain pointer. */
1421 struct eh_cie_fde *fde_list;
1423 /* A pointer used for various section optimizations. */
1427 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1428 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1429 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1430 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1431 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1432 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1433 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1434 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1435 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1437 #define xvec_get_elf_backend_data(xvec) \
1438 ((const struct elf_backend_data *) (xvec)->backend_data)
1440 #define get_elf_backend_data(abfd) \
1441 xvec_get_elf_backend_data ((abfd)->xvec)
1443 /* The least object attributes (within an attributes subsection) known
1444 for any target. Some code assumes that the value 0 is not used and
1445 the field for that attribute can instead be used as a marker to
1446 indicate that attributes have been initialized. */
1447 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1449 /* The maximum number of known object attributes for any target. */
1450 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1452 /* The value of an object attribute. The type indicates whether the attribute
1453 holds and integer, a string, or both. It can also indicate that there can
1454 be no default (i.e. all values must be written to file, even zero). */
1456 typedef struct obj_attribute
1458 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1459 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1460 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1462 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1463 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1464 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1471 typedef struct obj_attribute_list
1473 struct obj_attribute_list *next;
1476 } obj_attribute_list;
1478 /* Object attributes may either be defined by the processor ABI, index
1479 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1480 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1481 #define OBJ_ATTR_PROC 0
1482 #define OBJ_ATTR_GNU 1
1483 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1484 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1486 /* The following object attribute tags are taken as generic, for all
1487 targets and for "gnu" where there is no target standard. */
1494 Tag_compatibility = 32
1497 /* The following struct stores information about every SystemTap section
1498 found in the object file. */
1501 struct sdt_note *next;
1506 /* Some private data is stashed away for future use using the tdata pointer
1507 in the bfd structure. */
1509 struct elf_obj_tdata
1511 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1512 Elf_Internal_Shdr **elf_sect_ptr;
1513 Elf_Internal_Phdr *phdr;
1514 struct elf_segment_map *segment_map;
1515 struct elf_strtab_hash *strtab_ptr;
1518 unsigned int num_elf_sections; /* elf_sect_ptr size */
1519 int num_section_syms;
1520 asymbol **section_syms; /* STT_SECTION symbols for each section */
1521 Elf_Internal_Shdr symtab_hdr;
1522 Elf_Internal_Shdr shstrtab_hdr;
1523 Elf_Internal_Shdr strtab_hdr;
1524 Elf_Internal_Shdr dynsymtab_hdr;
1525 Elf_Internal_Shdr dynstrtab_hdr;
1526 Elf_Internal_Shdr dynversym_hdr;
1527 Elf_Internal_Shdr dynverref_hdr;
1528 Elf_Internal_Shdr dynverdef_hdr;
1529 Elf_Internal_Shdr symtab_shndx_hdr;
1530 unsigned int symtab_section, shstrtab_section;
1531 unsigned int strtab_section, dynsymtab_section;
1532 unsigned int symtab_shndx_section;
1533 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1534 file_ptr next_file_pos;
1535 bfd_vma gp; /* The gp value */
1536 unsigned int gp_size; /* The gp size */
1538 /* Information grabbed from an elf core file. */
1545 /* A mapping from external symbols to entries in the linker hash
1546 table, used when linking. This is indexed by the symbol index
1547 minus the sh_info field of the symbol table header. */
1548 struct elf_link_hash_entry **sym_hashes;
1550 /* Track usage and final offsets of GOT entries for local symbols.
1551 This array is indexed by symbol index. Elements are used
1552 identically to "got" in struct elf_link_hash_entry. */
1555 bfd_signed_vma *refcounts;
1557 struct got_entry **ents;
1560 /* The linker ELF emulation code needs to let the backend ELF linker
1561 know what filename should be used for a dynamic object if the
1562 dynamic object is found using a search. The emulation code then
1563 sometimes needs to know what name was actually used. Until the
1564 file has been added to the linker symbol table, this field holds
1565 the name the linker wants. After it has been added, it holds the
1566 name actually used, which will be the DT_SONAME entry if there is
1568 const char *dt_name;
1570 /* The linker emulation needs to know what audit libs
1571 are used by a dynamic object. */
1572 const char *dt_audit;
1574 /* Records the result of `get_program_header_size'. */
1575 bfd_size_type program_header_size;
1577 /* Used by find_nearest_line entry point. */
1580 /* Used by MIPS ELF find_nearest_line entry point. The structure
1581 could be included directly in this one, but there's no point to
1582 wasting the memory just for the infrequently called
1583 find_nearest_line. */
1584 struct mips_elf_find_line *find_line_info;
1586 /* A place to stash dwarf1 info for this bfd. */
1587 struct dwarf1_debug *dwarf1_find_line_info;
1589 /* A place to stash dwarf2 info for this bfd. */
1590 void *dwarf2_find_line_info;
1592 /* An array of stub sections indexed by symbol number, used by the
1593 MIPS ELF linker. FIXME: We should figure out some way to only
1594 include this field for a MIPS ELF target. */
1595 asection **local_stubs;
1596 asection **local_call_stubs;
1598 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1600 asection *eh_frame_hdr;
1602 Elf_Internal_Shdr **group_sect_ptr;
1605 /* Number of symbol version definitions we are about to emit. */
1606 unsigned int cverdefs;
1608 /* Number of symbol version references we are about to emit. */
1609 unsigned int cverrefs;
1611 /* Segment flags for the PT_GNU_STACK segment. */
1612 unsigned int stack_flags;
1614 /* Symbol version definitions in external objects. */
1615 Elf_Internal_Verdef *verdef;
1617 /* Symbol version references to external objects. */
1618 Elf_Internal_Verneed *verref;
1620 /* The Irix 5 support uses two virtual sections, which represent
1621 text/data symbols defined in dynamic objects. */
1622 asymbol *elf_data_symbol;
1623 asymbol *elf_text_symbol;
1624 asection *elf_data_section;
1625 asection *elf_text_section;
1627 /* A pointer to the .eh_frame section. */
1628 asection *eh_frame_section;
1630 /* Whether a dyanmic object was specified normally on the linker
1631 command line, or was specified when --as-needed was in effect,
1632 or was found via a DT_NEEDED entry. */
1633 enum dynamic_lib_link_class dyn_lib_class;
1635 /* This is set to TRUE if the object was created by the backend
1639 /* Irix 5 often screws up the symbol table, sorting local symbols
1640 after global symbols. This flag is set if the symbol table in
1641 this BFD appears to be screwed up. If it is, we ignore the
1642 sh_info field in the symbol table header, and always read all the
1644 bfd_boolean bad_symtab;
1646 /* Used to determine if the e_flags field has been initialized */
1647 bfd_boolean flags_init;
1649 /* Symbol buffer. */
1652 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1653 obj_attribute_list *other_obj_attributes[2];
1655 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1656 bfd_boolean (*after_write_object_contents) (bfd *);
1657 void *after_write_object_contents_info;
1659 /* NT_GNU_BUILD_ID note type. */
1660 bfd_size_type build_id_size;
1663 /* Linked-list containing information about every Systemtap section
1664 found in the object file. Each section corresponds to one entry
1666 struct sdt_note *sdt_note_head;
1668 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1669 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1670 field in the ELF header structure. */
1671 bfd_boolean has_gnu_symbols;
1673 /* An identifier used to distinguish different target
1674 specific extensions to this structure. */
1675 enum elf_target_id object_id;
1678 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1680 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1681 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1682 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1683 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1684 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1685 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1686 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1687 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1688 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1689 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1690 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1691 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1692 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1693 #define elf_eh_frame_section(bfd) \
1694 (elf_tdata(bfd) -> eh_frame_section)
1695 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1696 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1697 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1698 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1699 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1700 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1701 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1702 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1703 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1704 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1705 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1706 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1707 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1708 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1709 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1710 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1711 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1712 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1713 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1714 #define elf_known_obj_attributes_proc(bfd) \
1715 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1716 #define elf_other_obj_attributes_proc(bfd) \
1717 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1719 extern void _bfd_elf_swap_verdef_in
1720 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1721 extern void _bfd_elf_swap_verdef_out
1722 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1723 extern void _bfd_elf_swap_verdaux_in
1724 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1725 extern void _bfd_elf_swap_verdaux_out
1726 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1727 extern void _bfd_elf_swap_verneed_in
1728 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1729 extern void _bfd_elf_swap_verneed_out
1730 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1731 extern void _bfd_elf_swap_vernaux_in
1732 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1733 extern void _bfd_elf_swap_vernaux_out
1734 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1735 extern void _bfd_elf_swap_versym_in
1736 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1737 extern void _bfd_elf_swap_versym_out
1738 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1740 extern unsigned int _bfd_elf_section_from_bfd_section
1741 (bfd *, asection *);
1742 extern char *bfd_elf_string_from_elf_section
1743 (bfd *, unsigned, unsigned);
1744 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1745 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1746 Elf_External_Sym_Shndx *);
1747 extern const char *bfd_elf_sym_name
1748 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1750 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1752 extern bfd_boolean _bfd_elf_print_private_bfd_data
1754 extern void bfd_elf_print_symbol
1755 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1757 extern unsigned int _bfd_elf_eh_frame_address_size
1758 (bfd *, asection *);
1759 extern bfd_byte _bfd_elf_encode_eh_address
1760 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1761 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1762 extern bfd_boolean _bfd_elf_can_make_relative
1763 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1765 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1766 (const Elf_Internal_Rela *);
1767 extern bfd_vma _bfd_elf_rela_local_sym
1768 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1769 extern bfd_vma _bfd_elf_rel_local_sym
1770 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1771 extern bfd_vma _bfd_elf_section_offset
1772 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1774 extern unsigned long bfd_elf_hash
1776 extern unsigned long bfd_elf_gnu_hash
1779 extern bfd_reloc_status_type bfd_elf_generic_reloc
1780 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1781 extern bfd_boolean bfd_elf_allocate_object
1782 (bfd *, size_t, enum elf_target_id);
1783 extern bfd_boolean bfd_elf_make_object
1785 extern bfd_boolean bfd_elf_mkcorefile
1787 extern bfd_boolean _bfd_elf_make_section_from_shdr
1788 (bfd *, Elf_Internal_Shdr *, const char *, int);
1789 extern bfd_boolean _bfd_elf_make_section_from_phdr
1790 (bfd *, Elf_Internal_Phdr *, int, const char *);
1791 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1792 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1793 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1795 extern void _bfd_elf_link_hash_copy_indirect
1796 (struct bfd_link_info *, struct elf_link_hash_entry *,
1797 struct elf_link_hash_entry *);
1798 extern void _bfd_elf_link_hash_hide_symbol
1799 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1800 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1801 (struct bfd_link_info *, struct elf_link_hash_entry *);
1802 extern bfd_boolean _bfd_elf_link_hash_table_init
1803 (struct elf_link_hash_table *, bfd *,
1804 struct bfd_hash_entry *(*)
1805 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1806 unsigned int, enum elf_target_id);
1807 extern bfd_boolean _bfd_elf_slurp_version_tables
1808 (bfd *, bfd_boolean);
1809 extern bfd_boolean _bfd_elf_merge_sections
1810 (bfd *, struct bfd_link_info *);
1811 extern bfd_boolean _bfd_elf_match_sections_by_type
1812 (bfd *, const asection *, bfd *, const asection *);
1813 extern bfd_boolean bfd_elf_is_group_section
1814 (bfd *, const struct bfd_section *);
1815 extern bfd_boolean _bfd_elf_section_already_linked
1816 (bfd *, asection *, struct bfd_link_info *);
1817 extern void bfd_elf_set_group_contents
1818 (bfd *, asection *, void *);
1819 extern asection *_bfd_elf_check_kept_section
1820 (asection *, struct bfd_link_info *);
1821 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
1822 extern void _bfd_elf_copy_link_hash_symbol_type
1823 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1824 extern bfd_boolean _bfd_elf_size_group_sections
1825 (struct bfd_link_info *);
1826 extern bfd_boolean _bfd_elf_fixup_group_sections
1827 (bfd *, asection *);
1828 extern bfd_boolean _bfd_elf_copy_private_header_data
1830 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1831 (bfd *, asymbol *, bfd *, asymbol *);
1832 #define _bfd_generic_init_private_section_data \
1833 _bfd_elf_init_private_section_data
1834 extern bfd_boolean _bfd_elf_init_private_section_data
1835 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1836 extern bfd_boolean _bfd_elf_copy_private_section_data
1837 (bfd *, asection *, bfd *, asection *);
1838 extern bfd_boolean _bfd_elf_write_object_contents
1840 extern bfd_boolean _bfd_elf_write_corefile_contents
1842 extern bfd_boolean _bfd_elf_set_section_contents
1843 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1844 extern long _bfd_elf_get_symtab_upper_bound
1846 extern long _bfd_elf_canonicalize_symtab
1847 (bfd *, asymbol **);
1848 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1850 extern long _bfd_elf_canonicalize_dynamic_symtab
1851 (bfd *, asymbol **);
1852 extern long _bfd_elf_get_synthetic_symtab
1853 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1854 extern long _bfd_elf_get_reloc_upper_bound
1856 extern long _bfd_elf_canonicalize_reloc
1857 (bfd *, sec_ptr, arelent **, asymbol **);
1858 extern asection * _bfd_elf_get_dynamic_reloc_section
1859 (bfd *, asection *, bfd_boolean);
1860 extern asection * _bfd_elf_make_dynamic_reloc_section
1861 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1862 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1864 extern long _bfd_elf_canonicalize_dynamic_reloc
1865 (bfd *, arelent **, asymbol **);
1866 extern asymbol *_bfd_elf_make_empty_symbol
1868 extern void _bfd_elf_get_symbol_info
1869 (bfd *, asymbol *, symbol_info *);
1870 extern bfd_boolean _bfd_elf_is_local_label_name
1871 (bfd *, const char *);
1872 extern alent *_bfd_elf_get_lineno
1874 extern bfd_boolean _bfd_elf_set_arch_mach
1875 (bfd *, enum bfd_architecture, unsigned long);
1876 extern bfd_boolean _bfd_elf_find_nearest_line
1877 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1879 extern bfd_boolean _bfd_elf_find_nearest_line_discriminator
1880 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1881 unsigned int *, unsigned int *);
1882 extern bfd_boolean _bfd_elf_find_line
1883 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1884 extern bfd_boolean _bfd_elf_find_line_discriminator
1885 (bfd *, asymbol **, asymbol *, const char **, unsigned int *, unsigned int *);
1886 #define _bfd_generic_find_line _bfd_elf_find_line
1887 #define _bfd_generic_find_nearest_line_discriminator \
1888 _bfd_elf_find_nearest_line_discriminator
1889 extern bfd_boolean _bfd_elf_find_inliner_info
1890 (bfd *, const char **, const char **, unsigned int *);
1891 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1892 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1893 extern int _bfd_elf_sizeof_headers
1894 (bfd *, struct bfd_link_info *);
1895 extern bfd_boolean _bfd_elf_new_section_hook
1896 (bfd *, asection *);
1897 extern bfd_boolean _bfd_elf_init_reloc_shdr
1898 (bfd *, struct bfd_elf_section_reloc_data *, asection *, bfd_boolean);
1899 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1900 (const char *, const struct bfd_elf_special_section *, unsigned int);
1901 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1902 (bfd *, asection *);
1904 /* If the target doesn't have reloc handling written yet: */
1905 extern void _bfd_elf_no_info_to_howto
1906 (bfd *, arelent *, Elf_Internal_Rela *);
1908 extern bfd_boolean bfd_section_from_shdr
1909 (bfd *, unsigned int shindex);
1910 extern bfd_boolean bfd_section_from_phdr
1911 (bfd *, Elf_Internal_Phdr *, int);
1913 extern int _bfd_elf_symbol_from_bfd_symbol
1914 (bfd *, asymbol **);
1916 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1917 (struct sym_cache *, bfd *, unsigned long);
1918 extern asection *bfd_section_from_elf_index
1919 (bfd *, unsigned int);
1920 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1923 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1925 extern void _bfd_elf_strtab_free
1926 (struct elf_strtab_hash *);
1927 extern bfd_size_type _bfd_elf_strtab_add
1928 (struct elf_strtab_hash *, const char *, bfd_boolean);
1929 extern void _bfd_elf_strtab_addref
1930 (struct elf_strtab_hash *, bfd_size_type);
1931 extern void _bfd_elf_strtab_delref
1932 (struct elf_strtab_hash *, bfd_size_type);
1933 extern void _bfd_elf_strtab_clear_all_refs
1934 (struct elf_strtab_hash *);
1935 extern bfd_size_type _bfd_elf_strtab_size
1936 (struct elf_strtab_hash *);
1937 extern bfd_size_type _bfd_elf_strtab_offset
1938 (struct elf_strtab_hash *, bfd_size_type);
1939 extern bfd_boolean _bfd_elf_strtab_emit
1940 (bfd *, struct elf_strtab_hash *);
1941 extern void _bfd_elf_strtab_finalize
1942 (struct elf_strtab_hash *);
1944 extern void _bfd_elf_begin_eh_frame_parsing
1945 (struct bfd_link_info *info);
1946 extern void _bfd_elf_parse_eh_frame
1947 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1948 extern void _bfd_elf_end_eh_frame_parsing
1949 (struct bfd_link_info *info);
1951 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1952 (bfd *, struct bfd_link_info *, asection *,
1953 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1954 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1955 (bfd *, struct bfd_link_info *);
1956 extern bfd_vma _bfd_elf_eh_frame_section_offset
1957 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1958 extern bfd_boolean _bfd_elf_write_section_eh_frame
1959 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1960 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1961 (bfd *, struct bfd_link_info *);
1962 extern bfd_boolean _bfd_elf_eh_frame_present
1963 (struct bfd_link_info *);
1964 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1965 (struct bfd_link_info *);
1967 extern bfd_boolean _bfd_elf_merge_symbol
1968 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1969 asection **, bfd_vma *, unsigned int *,
1970 struct elf_link_hash_entry **, bfd_boolean *,
1971 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1973 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1975 extern long _bfd_elf_link_lookup_local_dynindx
1976 (struct bfd_link_info *, bfd *, long);
1977 extern bfd_boolean _bfd_elf_compute_section_file_positions
1978 (bfd *, struct bfd_link_info *);
1979 extern void _bfd_elf_assign_file_positions_for_relocs
1981 extern file_ptr _bfd_elf_assign_file_position_for_section
1982 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1984 extern bfd_boolean _bfd_elf_validate_reloc
1987 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1988 (bfd *, struct bfd_link_info *);
1989 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1990 (bfd *, struct bfd_link_info *, asection *);
1991 extern bfd_boolean _bfd_elf_create_dynamic_sections
1992 (bfd *, struct bfd_link_info *);
1993 extern bfd_boolean _bfd_elf_create_got_section
1994 (bfd *, struct bfd_link_info *);
1995 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1996 (bfd *, struct bfd_link_info *, asection *, const char *);
1997 extern void _bfd_elf_init_1_index_section
1998 (bfd *, struct bfd_link_info *);
1999 extern void _bfd_elf_init_2_index_sections
2000 (bfd *, struct bfd_link_info *);
2002 extern bfd_boolean _bfd_elfcore_make_pseudosection
2003 (bfd *, char *, size_t, ufile_ptr);
2004 extern char *_bfd_elfcore_strndup
2005 (bfd *, char *, size_t);
2007 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2008 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2010 extern bfd_boolean _bfd_elf_link_output_relocs
2011 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2012 struct elf_link_hash_entry **);
2014 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2015 (struct elf_link_hash_entry *, asection *);
2017 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2018 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2020 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2021 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2023 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2024 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2026 extern bfd_boolean _bfd_elf_setup_sections
2029 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
2031 extern const bfd_target *bfd_elf32_object_p
2033 extern const bfd_target *bfd_elf32_core_file_p
2035 extern char *bfd_elf32_core_file_failing_command
2037 extern int bfd_elf32_core_file_failing_signal
2039 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2041 extern int bfd_elf32_core_file_pid
2044 extern bfd_boolean bfd_elf32_swap_symbol_in
2045 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2046 extern void bfd_elf32_swap_symbol_out
2047 (bfd *, const Elf_Internal_Sym *, void *, void *);
2048 extern void bfd_elf32_swap_reloc_in
2049 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2050 extern void bfd_elf32_swap_reloc_out
2051 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2052 extern void bfd_elf32_swap_reloca_in
2053 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2054 extern void bfd_elf32_swap_reloca_out
2055 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2056 extern void bfd_elf32_swap_phdr_in
2057 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2058 extern void bfd_elf32_swap_phdr_out
2059 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2060 extern void bfd_elf32_swap_dyn_in
2061 (bfd *, const void *, Elf_Internal_Dyn *);
2062 extern void bfd_elf32_swap_dyn_out
2063 (bfd *, const Elf_Internal_Dyn *, void *);
2064 extern long bfd_elf32_slurp_symbol_table
2065 (bfd *, asymbol **, bfd_boolean);
2066 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2068 extern int bfd_elf32_write_out_phdrs
2069 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2070 extern bfd_boolean bfd_elf32_checksum_contents
2071 (bfd * , void (*) (const void *, size_t, void *), void *);
2072 extern void bfd_elf32_write_relocs
2073 (bfd *, asection *, void *);
2074 extern bfd_boolean bfd_elf32_slurp_reloc_table
2075 (bfd *, asection *, asymbol **, bfd_boolean);
2077 extern const bfd_target *bfd_elf64_object_p
2079 extern const bfd_target *bfd_elf64_core_file_p
2081 extern char *bfd_elf64_core_file_failing_command
2083 extern int bfd_elf64_core_file_failing_signal
2085 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2087 extern int bfd_elf64_core_file_pid
2090 extern bfd_boolean bfd_elf64_swap_symbol_in
2091 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2092 extern void bfd_elf64_swap_symbol_out
2093 (bfd *, const Elf_Internal_Sym *, void *, void *);
2094 extern void bfd_elf64_swap_reloc_in
2095 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2096 extern void bfd_elf64_swap_reloc_out
2097 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2098 extern void bfd_elf64_swap_reloca_in
2099 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2100 extern void bfd_elf64_swap_reloca_out
2101 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2102 extern void bfd_elf64_swap_phdr_in
2103 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2104 extern void bfd_elf64_swap_phdr_out
2105 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2106 extern void bfd_elf64_swap_dyn_in
2107 (bfd *, const void *, Elf_Internal_Dyn *);
2108 extern void bfd_elf64_swap_dyn_out
2109 (bfd *, const Elf_Internal_Dyn *, void *);
2110 extern long bfd_elf64_slurp_symbol_table
2111 (bfd *, asymbol **, bfd_boolean);
2112 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2114 extern int bfd_elf64_write_out_phdrs
2115 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2116 extern bfd_boolean bfd_elf64_checksum_contents
2117 (bfd * , void (*) (const void *, size_t, void *), void *);
2118 extern void bfd_elf64_write_relocs
2119 (bfd *, asection *, void *);
2120 extern bfd_boolean bfd_elf64_slurp_reloc_table
2121 (bfd *, asection *, asymbol **, bfd_boolean);
2123 extern bfd_boolean _bfd_elf_default_relocs_compatible
2124 (const bfd_target *, const bfd_target *);
2126 extern bfd_boolean _bfd_elf_relocs_compatible
2127 (const bfd_target *, const bfd_target *);
2129 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2130 (bfd *, struct bfd_link_info *, const char *);
2131 extern bfd_boolean bfd_elf_link_add_symbols
2132 (bfd *, struct bfd_link_info *);
2133 extern bfd_boolean _bfd_elf_add_dynamic_entry
2134 (struct bfd_link_info *, bfd_vma, bfd_vma);
2136 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2137 (struct bfd_link_info *, struct elf_link_hash_entry *);
2139 extern int bfd_elf_link_record_local_dynamic_symbol
2140 (struct bfd_link_info *, bfd *, long);
2142 extern bfd_boolean _bfd_elf_close_and_cleanup
2145 extern bfd_boolean _bfd_elf_common_definition
2146 (Elf_Internal_Sym *);
2148 extern unsigned int _bfd_elf_common_section_index
2151 extern asection *_bfd_elf_common_section
2154 extern bfd_vma _bfd_elf_default_got_elt_size
2155 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2158 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2159 (bfd *, arelent *, struct bfd_symbol *, void *,
2160 asection *, bfd *, char **);
2162 extern bfd_boolean bfd_elf_final_link
2163 (bfd *, struct bfd_link_info *);
2165 extern void _bfd_elf_gc_keep
2166 (struct bfd_link_info *info);
2168 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2169 (struct elf_link_hash_entry *h, void *inf);
2171 extern bfd_boolean bfd_elf_gc_sections
2172 (bfd *, struct bfd_link_info *);
2174 extern bfd_boolean bfd_elf_gc_record_vtinherit
2175 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2177 extern bfd_boolean bfd_elf_gc_record_vtentry
2178 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2180 extern asection *_bfd_elf_gc_mark_hook
2181 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2182 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2184 extern asection *_bfd_elf_gc_mark_rsec
2185 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2186 struct elf_reloc_cookie *);
2188 extern bfd_boolean _bfd_elf_gc_mark_reloc
2189 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2190 struct elf_reloc_cookie *);
2192 extern bfd_boolean _bfd_elf_gc_mark_fdes
2193 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2194 struct elf_reloc_cookie *);
2196 extern bfd_boolean _bfd_elf_gc_mark
2197 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2199 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2200 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2202 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2203 (bfd *, struct bfd_link_info *);
2205 extern bfd_boolean bfd_elf_gc_common_final_link
2206 (bfd *, struct bfd_link_info *);
2208 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2211 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2212 (bfd *, asection *);
2214 extern bfd_boolean _bfd_elf_map_sections_to_segments
2215 (bfd *, struct bfd_link_info *);
2217 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2219 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2222 extern int bfd_elf_get_default_section_type (flagword);
2224 extern bfd_boolean bfd_elf_lookup_section_flags
2225 (struct bfd_link_info *, struct flag_info *, asection *);
2227 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2228 (bfd * abfd, asection * section);
2230 /* Exported interface for writing elf corefile notes. */
2231 extern char *elfcore_write_note
2232 (bfd *, char *, int *, const char *, int, const void *, int);
2233 extern char *elfcore_write_prpsinfo
2234 (bfd *, char *, int *, const char *, const char *);
2235 extern char *elfcore_write_prstatus
2236 (bfd *, char *, int *, long, int, const void *);
2237 extern char * elfcore_write_pstatus
2238 (bfd *, char *, int *, long, int, const void *);
2239 extern char *elfcore_write_prfpreg
2240 (bfd *, char *, int *, const void *, int);
2241 extern char *elfcore_write_prxfpreg
2242 (bfd *, char *, int *, const void *, int);
2243 extern char *elfcore_write_xstatereg
2244 (bfd *, char *, int *, const void *, int);
2245 extern char *elfcore_write_ppc_vmx
2246 (bfd *, char *, int *, const void *, int);
2247 extern char *elfcore_write_ppc_vsx
2248 (bfd *, char *, int *, const void *, int);
2249 extern char *elfcore_write_s390_timer
2250 (bfd *, char *, int *, const void *, int);
2251 extern char *elfcore_write_s390_todcmp
2252 (bfd *, char *, int *, const void *, int);
2253 extern char *elfcore_write_s390_todpreg
2254 (bfd *, char *, int *, const void *, int);
2255 extern char *elfcore_write_s390_ctrs
2256 (bfd *, char *, int *, const void *, int);
2257 extern char *elfcore_write_s390_prefix
2258 (bfd *, char *, int *, const void *, int);
2259 extern char *elfcore_write_s390_last_break
2260 (bfd *, char *, int *, const void *, int);
2261 extern char *elfcore_write_s390_system_call
2262 (bfd *, char *, int *, const void *, int);
2263 extern char *elfcore_write_arm_vfp
2264 (bfd *, char *, int *, const void *, int);
2265 extern char *elfcore_write_lwpstatus
2266 (bfd *, char *, int *, long, int, const void *);
2267 extern char *elfcore_write_register_note
2268 (bfd *, char *, int *, const char *, const void *, int);
2270 extern bfd *_bfd_elf32_bfd_from_remote_memory
2271 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2272 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2273 extern bfd *_bfd_elf64_bfd_from_remote_memory
2274 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2275 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2277 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2278 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2279 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2280 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2281 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2282 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2283 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2284 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2285 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2286 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2288 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2289 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2292 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2293 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2294 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2295 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2296 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2297 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2298 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2299 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2301 /* The linker may need to keep track of the number of relocs that it
2302 decides to copy as dynamic relocs in check_relocs for each symbol.
2303 This is so that it can later discard them if they are found to be
2304 unnecessary. We can store the information in a field extending the
2305 regular ELF linker hash table. */
2307 struct elf_dyn_relocs
2309 struct elf_dyn_relocs *next;
2311 /* The input section of the reloc. */
2314 /* Total number of relocs copied for the input section. */
2315 bfd_size_type count;
2317 /* Number of pc-relative relocs copied for the input section. */
2318 bfd_size_type pc_count;
2321 extern bfd_boolean _bfd_elf_create_ifunc_sections
2322 (bfd *, struct bfd_link_info *);
2323 extern asection * _bfd_elf_create_ifunc_dyn_reloc
2324 (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc,
2325 struct elf_dyn_relocs **);
2326 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2327 (struct bfd_link_info *, struct elf_link_hash_entry *,
2328 struct elf_dyn_relocs **, unsigned int, unsigned int);
2330 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2331 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2333 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2334 extern bfd_vma elf64_r_sym (bfd_vma);
2335 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2336 extern bfd_vma elf32_r_sym (bfd_vma);
2338 /* Large common section. */
2339 extern asection _bfd_elf_large_com_section;
2341 /* Hash for local symbol with the first section id, ID, in the input
2342 file and the local symbol index, SYM. */
2343 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2344 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2345 ^ (SYM) ^ ((ID) >> 16))
2347 /* This is the condition under which finish_dynamic_symbol will be called.
2348 If our finish_dynamic_symbol isn't called, we'll need to do something
2349 about initializing any .plt and .got entries in relocate_section. */
2350 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2352 && ((SHARED) || !(H)->forced_local) \
2353 && ((H)->dynindx != -1 || (H)->forced_local))
2355 /* This macro is to avoid lots of duplicated code in the body
2356 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2357 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2358 r_symndx, symtab_hdr, sym_hashes, \
2359 h, sec, relocation, \
2360 unresolved_reloc, warned) \
2363 /* It seems this can happen with erroneous or unsupported \
2364 input (mixing a.out and elf in an archive, for example.) */ \
2365 if (sym_hashes == NULL) \
2368 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2370 while (h->root.type == bfd_link_hash_indirect \
2371 || h->root.type == bfd_link_hash_warning) \
2372 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2375 unresolved_reloc = FALSE; \
2377 if (h->root.type == bfd_link_hash_defined \
2378 || h->root.type == bfd_link_hash_defweak) \
2380 sec = h->root.u.def.section; \
2382 || sec->output_section == NULL) \
2383 /* Set a flag that will be cleared later if we find a \
2384 relocation value for this symbol. output_section \
2385 is typically NULL for symbols satisfied by a shared \
2387 unresolved_reloc = TRUE; \
2389 relocation = (h->root.u.def.value \
2390 + sec->output_section->vma \
2391 + sec->output_offset); \
2393 else if (h->root.type == bfd_link_hash_undefweak) \
2395 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2396 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2398 else if (!info->relocatable) \
2401 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2402 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2403 if (!info->callbacks->undefined_symbol (info, \
2404 h->root.root.string, \
2407 rel->r_offset, err)) \
2411 (void) unresolved_reloc; \
2416 /* This macro is to avoid lots of duplicated code in the body of the
2417 loop over relocations in xxx_relocate_section() in the various
2420 Handle relocations against symbols from removed linkonce sections,
2421 or sections discarded by a linker script. When doing a relocatable
2422 link, we remove such relocations. Otherwise, we just want the
2423 section contents zeroed and avoid any special processing. */
2424 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2425 rel, count, relend, \
2426 howto, index, contents) \
2429 _bfd_clear_contents (howto, input_bfd, input_section, \
2430 contents + rel[index].r_offset); \
2432 if (info->relocatable \
2433 && (input_section->flags & SEC_DEBUGGING)) \
2435 /* Only remove relocations in debug sections since other \
2436 sections may require relocations. */ \
2437 Elf_Internal_Shdr *rel_hdr; \
2439 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2441 /* Avoid empty output section. */ \
2442 if (rel_hdr->sh_size > count * rel_hdr->sh_entsize) \
2444 rel_hdr->sh_size -= count * rel_hdr->sh_entsize; \
2445 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2446 rel_hdr->sh_size -= count * rel_hdr->sh_entsize; \
2448 memmove (rel, rel + count, \
2449 (relend - rel - count) * sizeof (*rel)); \
2451 input_section->reloc_count -= count; \
2458 for (i_ = 0; i_ < count; i_++) \
2460 rel[i_].r_info = 0; \
2461 rel[i_].r_addend = 0; \
2467 /* Will a symbol be bound to the the definition within the shared
2468 library, if any. A unique symbol can never be bound locally. */
2469 #define SYMBOLIC_BIND(INFO, H) \
2470 (!(H)->unique_global \
2471 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2473 #endif /* _LIBELF_H_ */