1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2014 Free Software Foundation, Inc.
3 Written by Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
25 #include "elf/common.h"
26 #include "elf/external.h"
27 #include "elf/internal.h"
30 /* The number of entries in a section is its size divided by the size
31 of a single entry. This is normally only applicable to reloc and
32 symbol table sections.
33 PR 9934: It is possible to have relocations that do not refer to
34 symbols, thus it is also possible to have a relocation section in
35 an object file, but no symbol table. */
36 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
38 /* If size isn't specified as 64 or 32, NAME macro should fail. */
41 #define NAME(x, y) x ## 64 ## _ ## y
44 #define NAME(x, y) x ## 32 ## _ ## y
49 #define NAME(x, y) x ## NOSIZE ## _ ## y
52 #define ElfNAME(X) NAME(Elf,X)
53 #define elfNAME(X) NAME(elf,X)
55 /* Information held for an ELF symbol. The first field is the
56 corresponding asymbol. Every symbol is an ELF file is actually a
57 pointer to this structure, although it is often handled as a
58 pointer to an asymbol. */
64 /* ELF symbol information. */
65 Elf_Internal_Sym internal_elf_sym;
66 /* Backend specific information. */
69 unsigned int hppa_arg_reloc;
75 /* Version information. This is from an Elf_Internal_Versym
76 structure in a SHT_GNU_versym section. It is zero if there is no
77 version information. */
78 unsigned short version;
82 struct elf_strtab_hash;
88 bfd_signed_vma refcount;
90 struct got_entry *glist;
91 struct plt_entry *plist;
94 struct elf_link_virtual_table_entry
96 /* Virtual table entry use information. This array is nominally of size
97 size/sizeof(target_void_pointer), though we have to be able to assume
98 and track a size while the symbol is still undefined. It is indexed
99 via offset/sizeof(target_void_pointer). */
103 /* Virtual table derivation info. */
104 struct elf_link_hash_entry *parent;
107 /* ELF linker hash table entries. */
109 struct elf_link_hash_entry
111 struct bfd_link_hash_entry root;
113 /* Symbol index in output file. This is initialized to -1. It is
114 set to -2 if the symbol is used by a reloc. */
117 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
118 -1 if this is not a dynamic symbol. */
119 /* ??? Note that this is consistently used as a synonym for tests
120 against whether we can perform various simplifying transformations
121 to the code. (E.g. changing a pc-relative jump to a PLT entry
122 into a pc-relative jump to the target function.) That test, which
123 is often relatively complex, and someplaces wrong or incomplete,
124 should really be replaced by a predicate in elflink.c.
126 End result: this field -1 does not indicate that the symbol is
127 not in the dynamic symbol table, but rather that the symbol is
128 not visible outside this DSO. */
131 /* If this symbol requires an entry in the global offset table, the
132 processor specific backend uses this field to track usage and
133 final offset. Two schemes are supported: The first assumes that
134 a symbol may only have one GOT entry, and uses REFCOUNT until
135 size_dynamic_sections, at which point the contents of the .got is
136 fixed. Afterward, if OFFSET is -1, then the symbol does not
137 require a global offset table entry. The second scheme allows
138 multiple GOT entries per symbol, managed via a linked list
139 pointed to by GLIST. */
140 union gotplt_union got;
142 /* Same, but tracks a procedure linkage table entry. */
143 union gotplt_union plt;
148 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
149 unsigned int type : 8;
151 /* Symbol st_other value, symbol visibility. */
152 unsigned int other : 8;
154 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
155 unsigned int target_internal : 8;
157 /* Symbol is referenced by a non-shared object (other than the object
158 in which it is defined). */
159 unsigned int ref_regular : 1;
160 /* Symbol is defined by a non-shared object. */
161 unsigned int def_regular : 1;
162 /* Symbol is referenced by a shared object. */
163 unsigned int ref_dynamic : 1;
164 /* Symbol is defined by a shared object. */
165 unsigned int def_dynamic : 1;
166 /* Symbol has a non-weak reference from a non-shared object (other than
167 the object in which it is defined). */
168 unsigned int ref_regular_nonweak : 1;
169 /* Dynamic symbol has been adjustd. */
170 unsigned int dynamic_adjusted : 1;
171 /* Symbol needs a copy reloc. */
172 unsigned int needs_copy : 1;
173 /* Symbol needs a procedure linkage table entry. */
174 unsigned int needs_plt : 1;
175 /* Symbol appears in a non-ELF input file. */
176 unsigned int non_elf : 1;
177 /* Symbol should be marked as hidden in the version information. */
178 unsigned int hidden : 1;
179 /* Symbol was forced to local scope due to a version script file. */
180 unsigned int forced_local : 1;
181 /* Symbol was forced to be dynamic due to a version script file. */
182 unsigned int dynamic : 1;
183 /* Symbol was marked during garbage collection. */
184 unsigned int mark : 1;
185 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
186 not currently set by all the backends. */
187 unsigned int non_got_ref : 1;
188 /* Symbol has a definition in a shared object.
189 FIXME: There is no real need for this field if def_dynamic is never
190 cleared and all places that test def_dynamic also test def_regular. */
191 unsigned int dynamic_def : 1;
192 /* Symbol has a non-weak reference from a shared object. */
193 unsigned int ref_dynamic_nonweak : 1;
194 /* Symbol is referenced with a relocation where C/C++ pointer equality
196 unsigned int pointer_equality_needed : 1;
197 /* Symbol is a unique global symbol. */
198 unsigned int unique_global : 1;
200 /* String table index in .dynstr if this is a dynamic symbol. */
201 unsigned long dynstr_index;
205 /* If this is a weak defined symbol from a dynamic object, this
206 field points to a defined symbol with the same value, if there is
207 one. Otherwise it is NULL. */
208 struct elf_link_hash_entry *weakdef;
210 /* Hash value of the name computed using the ELF hash function.
211 Used part way through size_dynamic_sections, after we've finished
213 unsigned long elf_hash_value;
216 /* Version information. */
219 /* This field is used for a symbol which is not defined in a
220 regular object. It points to the version information read in
221 from the dynamic object. */
222 Elf_Internal_Verdef *verdef;
223 /* This field is used for a symbol which is defined in a regular
224 object. It is set up in size_dynamic_sections. It points to
225 the version information we should write out for this symbol. */
226 struct bfd_elf_version_tree *vertree;
229 struct elf_link_virtual_table_entry *vtable;
232 /* Will references to this symbol always reference the symbol
234 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
235 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
237 /* Will _calls_ to this symbol always call the version in this object? */
238 #define SYMBOL_CALLS_LOCAL(INFO, H) \
239 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
241 /* Common symbols that are turned into definitions don't have the
242 DEF_REGULAR flag set, so they might appear to be undefined. */
243 #define ELF_COMMON_DEF_P(H) \
245 && !(H)->def_dynamic \
246 && (H)->root.type == bfd_link_hash_defined)
248 /* Records local symbols to be emitted in the dynamic symbol table. */
250 struct elf_link_local_dynamic_entry
252 struct elf_link_local_dynamic_entry *next;
254 /* The input bfd this symbol came from. */
257 /* The index of the local symbol being copied. */
260 /* The index in the outgoing dynamic symbol table. */
263 /* A copy of the input symbol. */
264 Elf_Internal_Sym isym;
267 struct elf_link_loaded_list
269 struct elf_link_loaded_list *next;
273 /* Structures used by the eh_frame optimization code. */
278 /* If REMOVED == 1, this is the CIE that the FDE originally used.
279 The CIE belongs to the same .eh_frame input section as the FDE.
281 If REMOVED == 0, this is the CIE that we have chosen to use for
282 the output FDE. The CIE's REMOVED field is also 0, but the CIE
283 might belong to a different .eh_frame input section from the FDE. */
284 struct eh_cie_fde *cie_inf;
285 struct eh_cie_fde *next_for_section;
288 /* CIEs have three states:
290 - REMOVED && !MERGED: Slated for removal because we haven't yet
291 proven that an FDE needs it. FULL_CIE, if nonnull, points to
292 more detailed information about the CIE.
294 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
295 which may not belong to the same input section.
297 - !REMOVED: We have decided to keep this CIE. SEC is the
298 .eh_frame input section that contains the CIE. */
300 struct cie *full_cie;
301 struct eh_cie_fde *merged_with;
305 /* The offset of the personality data from the start of the CIE,
306 or 0 if the CIE doesn't have any. */
307 unsigned int personality_offset : 8;
309 /* True if we have marked relocations associated with this CIE. */
310 unsigned int gc_mark : 1;
312 /* True if we have decided to turn an absolute LSDA encoding into
313 a PC-relative one. */
314 unsigned int make_lsda_relative : 1;
316 /* True if we have decided to turn an absolute personality
317 encoding into a PC-relative one. */
318 unsigned int make_per_encoding_relative : 1;
320 /* True if the CIE contains personality data and if that
321 data uses a PC-relative encoding. Always true when
322 make_per_encoding_relative is. */
323 unsigned int per_encoding_relative : 1;
325 /* True if we need to add an 'R' (FDE encoding) entry to the
326 CIE's augmentation data. */
327 unsigned int add_fde_encoding : 1;
329 /* True if we have merged this CIE with another. */
330 unsigned int merged : 1;
333 unsigned int pad1 : 18;
336 unsigned int reloc_index;
339 unsigned int new_offset;
340 unsigned int fde_encoding : 8;
341 unsigned int lsda_encoding : 8;
342 unsigned int lsda_offset : 8;
344 /* True if this entry represents a CIE, false if it represents an FDE. */
345 unsigned int cie : 1;
347 /* True if this entry is currently marked for removal. */
348 unsigned int removed : 1;
350 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
351 augmentation data, and an associated byte to each of the CIE's FDEs. */
352 unsigned int add_augmentation_size : 1;
354 /* True if we have decided to convert absolute FDE relocations into
355 relative ones. This applies to the first relocation in the FDE,
356 which is against the code that the FDE describes. */
357 unsigned int make_relative : 1;
360 unsigned int pad1 : 4;
362 unsigned int *set_loc;
365 struct eh_frame_sec_info
369 struct eh_cie_fde entry[1];
372 struct eh_frame_array_ent
381 struct eh_frame_hdr_info
385 unsigned int fde_count, array_count;
386 struct eh_frame_array_ent *array;
387 /* TRUE if .eh_frame_hdr should contain the sorted search table.
388 We build it if we successfully read all .eh_frame input sections
389 and recognize them. */
393 /* Enum used to identify target specific extensions to the elf_obj_tdata
394 and elf_link_hash_table structures. Note the enums deliberately start
395 from 1 so that we can detect an uninitialized field. The generic value
396 is last so that additions to this enum do not need to modify more than
400 AARCH64_ELF_DATA = 1,
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 /* The _DYNAMIC symbol. */
501 struct elf_link_hash_entry *hdynamic;
503 /* A pointer to information used to merge SEC_MERGE sections. */
506 /* Used to link stabs in sections. */
507 struct stab_info stab_info;
509 /* Used by eh_frame code when editing .eh_frame. */
510 struct eh_frame_hdr_info eh_info;
512 /* A linked list of local symbols to be added to .dynsym. */
513 struct elf_link_local_dynamic_entry *dynlocal;
515 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
516 objects included in the link. */
517 struct bfd_link_needed_list *runpath;
519 /* Cached first output tls section and size of PT_TLS segment. */
521 bfd_size_type tls_size;
523 /* A linked list of BFD's loaded in the link. */
524 struct elf_link_loaded_list *loaded;
526 /* Short-cuts to get to dynamic linker sections. */
538 /* Look up an entry in an ELF linker hash table. */
540 #define elf_link_hash_lookup(table, string, create, copy, follow) \
541 ((struct elf_link_hash_entry *) \
542 bfd_link_hash_lookup (&(table)->root, (string), (create), \
545 /* Traverse an ELF linker hash table. */
547 #define elf_link_hash_traverse(table, func, info) \
548 (bfd_link_hash_traverse \
550 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
553 /* Get the ELF linker hash table from a link_info structure. */
555 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
557 #define elf_hash_table_id(table) ((table) -> hash_table_id)
559 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
560 #define is_elf_hash_table(htab) \
561 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
563 /* Used by bfd_sym_from_r_symndx to cache a small number of local
565 #define LOCAL_SYM_CACHE_SIZE 32
569 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
570 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
573 /* Constant information held for an ELF backend. */
575 struct elf_size_info {
576 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
577 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
579 /* The size of entries in the .hash section. */
580 unsigned char sizeof_hash_entry;
582 /* The number of internal relocations to allocate per external
584 unsigned char int_rels_per_ext_rel;
585 /* We use some fixed size arrays. This should be large enough to
586 handle all back-ends. */
587 #define MAX_INT_RELS_PER_EXT_REL 3
589 unsigned char arch_size, log_file_align;
590 unsigned char elfclass, ev_current;
591 int (*write_out_phdrs)
592 (bfd *, const Elf_Internal_Phdr *, unsigned int);
594 (*write_shdrs_and_ehdr) (bfd *);
595 bfd_boolean (*checksum_contents)
596 (bfd * , void (*) (const void *, size_t, void *), void *);
598 (bfd *, asection *, void *);
599 bfd_boolean (*swap_symbol_in)
600 (bfd *, const void *, const void *, Elf_Internal_Sym *);
601 void (*swap_symbol_out)
602 (bfd *, const Elf_Internal_Sym *, void *, void *);
603 bfd_boolean (*slurp_reloc_table)
604 (bfd *, asection *, asymbol **, bfd_boolean);
605 long (*slurp_symbol_table)
606 (bfd *, asymbol **, bfd_boolean);
608 (bfd *, const void *, Elf_Internal_Dyn *);
610 (bfd *, const Elf_Internal_Dyn *, void *);
612 /* This function is called to swap in a REL relocation. If an
613 external relocation corresponds to more than one internal
614 relocation, then all relocations are swapped in at once. */
615 void (*swap_reloc_in)
616 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
618 /* This function is called to swap out a REL relocation. */
619 void (*swap_reloc_out)
620 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
622 /* This function is called to swap in a RELA relocation. If an
623 external relocation corresponds to more than one internal
624 relocation, then all relocations are swapped in at once. */
625 void (*swap_reloca_in)
626 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
628 /* This function is called to swap out a RELA relocation. */
629 void (*swap_reloca_out)
630 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
633 #define elf_symbol_from(ABFD,S) \
634 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
635 && (S)->the_bfd->tdata.elf_obj_data != 0) \
636 ? (elf_symbol_type *) (S) \
639 enum elf_reloc_type_class {
641 reloc_class_relative,
647 struct elf_reloc_cookie
649 Elf_Internal_Rela *rels, *rel, *relend;
650 Elf_Internal_Sym *locsyms;
654 struct elf_link_hash_entry **sym_hashes;
656 bfd_boolean bad_symtab;
659 /* The level of IRIX compatibility we're striving for. */
667 /* Mapping of ELF section names and types. */
668 struct bfd_elf_special_section
672 /* 0 means name must match PREFIX exactly.
673 -1 means name must start with PREFIX followed by an arbitrary string.
674 -2 means name must match PREFIX exactly or consist of PREFIX followed
675 by a dot then anything.
676 > 0 means name must start with the first PREFIX_LENGTH chars of
677 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
683 enum action_discarded
689 typedef asection * (*elf_gc_mark_hook_fn)
690 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
691 struct elf_link_hash_entry *, Elf_Internal_Sym *);
693 struct elf_backend_data
695 /* The architecture for this backend. */
696 enum bfd_architecture arch;
698 /* An identifier used to distinguish different target specific
699 extensions to elf_obj_tdata and elf_link_hash_table structures. */
700 enum elf_target_id target_id;
702 /* The ELF machine code (EM_xxxx) for this backend. */
703 int elf_machine_code;
708 /* The maximum page size for this backend. */
711 /* The minimum page size for this backend. An input object will not be
712 considered page aligned unless its sections are correctly aligned for
713 pages at least this large. May be smaller than maxpagesize. */
716 /* The common page size for this backend. */
717 bfd_vma commonpagesize;
719 /* The BFD flags applied to sections created for dynamic linking. */
720 flagword dynamic_sec_flags;
722 /* Architecture-specific data for this backend.
723 This is actually a pointer to some type like struct elf_ARCH_data. */
724 const void *arch_data;
726 /* A function to translate an ELF RELA relocation to a BFD arelent
728 void (*elf_info_to_howto)
729 (bfd *, arelent *, Elf_Internal_Rela *);
731 /* A function to translate an ELF REL relocation to a BFD arelent
733 void (*elf_info_to_howto_rel)
734 (bfd *, arelent *, Elf_Internal_Rela *);
736 /* A function to determine whether a symbol is global when
737 partitioning the symbol table into local and global symbols.
738 This should be NULL for most targets, in which case the correct
739 thing will be done. MIPS ELF, at least on the Irix 5, has
740 special requirements. */
741 bfd_boolean (*elf_backend_sym_is_global)
744 /* The remaining functions are hooks which are called only if they
747 /* A function to permit a backend specific check on whether a
748 particular BFD format is relevant for an object file, and to
749 permit the backend to set any global information it wishes. When
750 this is called elf_elfheader is set, but anything else should be
751 used with caution. If this returns FALSE, the check_format
752 routine will return a bfd_error_wrong_format error. */
753 bfd_boolean (*elf_backend_object_p)
756 /* A function to do additional symbol processing when reading the
757 ELF symbol table. This is where any processor-specific special
758 section indices are handled. */
759 void (*elf_backend_symbol_processing)
762 /* A function to do additional symbol processing after reading the
763 entire ELF symbol table. */
764 bfd_boolean (*elf_backend_symbol_table_processing)
765 (bfd *, elf_symbol_type *, unsigned int);
767 /* A function to set the type of the info field. Processor-specific
768 types should be handled here. */
769 int (*elf_backend_get_symbol_type)
770 (Elf_Internal_Sym *, int);
772 /* A function to return the linker hash table entry of a symbol that
773 might be satisfied by an archive symbol. */
774 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
775 (bfd *, struct bfd_link_info *, const char *);
777 /* Return true if local section symbols should have a non-null st_name.
778 NULL implies false. */
779 bfd_boolean (*elf_backend_name_local_section_symbols)
782 /* A function to do additional processing on the ELF section header
783 just before writing it out. This is used to set the flags and
784 type fields for some sections, or to actually write out data for
786 bfd_boolean (*elf_backend_section_processing)
787 (bfd *, Elf_Internal_Shdr *);
789 /* A function to handle unusual section types when creating BFD
790 sections from ELF sections. */
791 bfd_boolean (*elf_backend_section_from_shdr)
792 (bfd *, Elf_Internal_Shdr *, const char *, int);
794 /* A function to convert machine dependent ELF section header flags to
795 BFD internal section header flags. */
796 bfd_boolean (*elf_backend_section_flags)
797 (flagword *, const Elf_Internal_Shdr *);
799 /* A function that returns a struct containing ELF section flags and
800 type for the given BFD section. */
801 const struct bfd_elf_special_section * (*get_sec_type_attr)
804 /* A function to handle unusual program segment types when creating BFD
805 sections from ELF program segments. */
806 bfd_boolean (*elf_backend_section_from_phdr)
807 (bfd *, Elf_Internal_Phdr *, int, const char *);
809 /* A function to set up the ELF section header for a BFD section in
810 preparation for writing it out. This is where the flags and type
811 fields are set for unusual sections. */
812 bfd_boolean (*elf_backend_fake_sections)
813 (bfd *, Elf_Internal_Shdr *, asection *);
815 /* A function to get the ELF section index for a BFD section. If
816 this returns TRUE, the section was found. If it is a normal ELF
817 section, *RETVAL should be left unchanged. If it is not a normal
818 ELF section *RETVAL should be set to the SHN_xxxx index. */
819 bfd_boolean (*elf_backend_section_from_bfd_section)
820 (bfd *, asection *, int *retval);
822 /* If this field is not NULL, it is called by the add_symbols phase
823 of a link just before adding a symbol to the global linker hash
824 table. It may modify any of the fields as it wishes. If *NAME
825 is set to NULL, the symbol will be skipped rather than being
826 added to the hash table. This function is responsible for
827 handling all processor dependent symbol bindings and section
828 indices, and must set at least *FLAGS and *SEC for each processor
829 dependent case; failure to do so will cause a link error. */
830 bfd_boolean (*elf_add_symbol_hook)
831 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
832 const char **name, flagword *flags, asection **sec, bfd_vma *value);
834 /* If this field is not NULL, it is called by the elf_link_output_sym
835 phase of a link for each symbol which will appear in the object file.
836 On error, this function returns 0. 1 is returned when the symbol
837 should be output, 2 is returned when the symbol should be discarded. */
838 int (*elf_backend_link_output_symbol_hook)
839 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
840 asection *, struct elf_link_hash_entry *);
842 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
843 linker the first time it encounters a dynamic object in the link.
844 This function must create any sections required for dynamic
845 linking. The ABFD argument is a dynamic object. The .interp,
846 .dynamic, .dynsym, .dynstr, and .hash functions have already been
847 created, and this function may modify the section flags if
848 desired. This function will normally create the .got and .plt
849 sections, but different backends have different requirements. */
850 bfd_boolean (*elf_backend_create_dynamic_sections)
851 (bfd *abfd, struct bfd_link_info *info);
853 /* When creating a shared library, determine whether to omit the
854 dynamic symbol for the section. */
855 bfd_boolean (*elf_backend_omit_section_dynsym)
856 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
858 /* Return TRUE if relocations of targets are compatible to the extent
859 that CHECK_RELOCS will properly process them. PR 4424. */
860 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
862 /* The CHECK_RELOCS function is called by the add_symbols phase of
863 the ELF backend linker. It is called once for each section with
864 relocs of an object file, just after the symbols for the object
865 file have been added to the global linker hash table. The
866 function must look through the relocs and do any special handling
867 required. This generally means allocating space in the global
868 offset table, and perhaps allocating space for a reloc. The
869 relocs are always passed as Rela structures; if the section
870 actually uses Rel structures, the r_addend field will always be
872 bfd_boolean (*check_relocs)
873 (bfd *abfd, struct bfd_link_info *info, asection *o,
874 const Elf_Internal_Rela *relocs);
876 /* The CHECK_DIRECTIVES function is called once per input file by
877 the add_symbols phase of the ELF backend linker. The function
878 must inspect the bfd and create any additional symbols according
879 to any custom directives in the bfd. */
880 bfd_boolean (*check_directives)
881 (bfd *abfd, struct bfd_link_info *info);
883 /* The NOTICE_AS_NEEDED function is called as the linker is about to
884 handle an as-needed lib (ACT = notice_as_needed), and after the
885 linker has decided to keep the lib (ACT = notice_needed) or when
886 the lib is not needed (ACT = notice_not_needed). */
887 bfd_boolean (*notice_as_needed)
888 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
890 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
891 linker for every symbol which is defined by a dynamic object and
892 referenced by a regular object. This is called after all the
893 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
894 function has been called. The hash table entry should be
895 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
896 defined in a section from a dynamic object. Dynamic object
897 sections are not included in the final link, and this function is
898 responsible for changing the value to something which the rest of
899 the link can deal with. This will normally involve adding an
900 entry to the .plt or .got or some such section, and setting the
901 symbol to point to that. */
902 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
903 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
905 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
906 after all the linker input files have been seen but before the
907 section sizes have been set. This is called after
908 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
909 bfd_boolean (*elf_backend_always_size_sections)
910 (bfd *output_bfd, struct bfd_link_info *info);
912 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
913 linker after all the linker input files have been seen but before
914 the sections sizes have been set. This is called after
915 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
916 It is only called when linking against a dynamic object. It must
917 set the sizes of the dynamic sections, and may fill in their
918 contents as well. The generic ELF linker can handle the .dynsym,
919 .dynstr and .hash sections. This function must handle the
920 .interp section and any sections created by the
921 CREATE_DYNAMIC_SECTIONS entry point. */
922 bfd_boolean (*elf_backend_size_dynamic_sections)
923 (bfd *output_bfd, struct bfd_link_info *info);
925 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
926 we keep to use as a base for relocs and symbols. */
927 void (*elf_backend_init_index_section)
928 (bfd *output_bfd, struct bfd_link_info *info);
930 /* The RELOCATE_SECTION function is called by the ELF backend linker
931 to handle the relocations for a section.
933 The relocs are always passed as Rela structures; if the section
934 actually uses Rel structures, the r_addend field will always be
937 This function is responsible for adjust the section contents as
938 necessary, and (if using Rela relocs and generating a
939 relocatable output file) adjusting the reloc addend as
942 This function does not have to worry about setting the reloc
943 address or the reloc symbol index.
945 LOCAL_SYMS is a pointer to the swapped in local symbols.
947 LOCAL_SECTIONS is an array giving the section in the input file
948 corresponding to the st_shndx field of each local symbol.
950 The global hash table entry for the global symbols can be found
951 via elf_sym_hashes (input_bfd).
953 When generating relocatable output, this function must handle
954 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
955 going to be the section symbol corresponding to the output
956 section, which means that the addend must be adjusted
959 Returns FALSE on error, TRUE on success, 2 if successful and
960 relocations should be written for this section. */
961 int (*elf_backend_relocate_section)
962 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
963 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
964 Elf_Internal_Sym *local_syms, asection **local_sections);
966 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
967 linker just before it writes a symbol out to the .dynsym section.
968 The processor backend may make any required adjustment to the
969 symbol. It may also take the opportunity to set contents of the
970 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
971 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
972 on those symbols which are defined by a dynamic object. */
973 bfd_boolean (*elf_backend_finish_dynamic_symbol)
974 (bfd *output_bfd, struct bfd_link_info *info,
975 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
977 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
978 linker just before it writes all the dynamic sections out to the
979 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
980 all dynamic symbols. */
981 bfd_boolean (*elf_backend_finish_dynamic_sections)
982 (bfd *output_bfd, struct bfd_link_info *info);
984 /* A function to do any beginning processing needed for the ELF file
985 before building the ELF headers and computing file positions. */
986 void (*elf_backend_begin_write_processing)
987 (bfd *, struct bfd_link_info *);
989 /* A function to do any final processing needed for the ELF file
990 before writing it out. The LINKER argument is TRUE if this BFD
991 was created by the ELF backend linker. */
992 void (*elf_backend_final_write_processing)
993 (bfd *, bfd_boolean linker);
995 /* This function is called by get_program_header_size. It should
996 return the number of additional program segments which this BFD
997 will need. It should return -1 on error. */
998 int (*elf_backend_additional_program_headers)
999 (bfd *, struct bfd_link_info *);
1001 /* This function is called to modify an existing segment map in a
1002 backend specific fashion. */
1003 bfd_boolean (*elf_backend_modify_segment_map)
1004 (bfd *, struct bfd_link_info *);
1006 /* This function is called to modify program headers just before
1007 they are written. */
1008 bfd_boolean (*elf_backend_modify_program_headers)
1009 (bfd *, struct bfd_link_info *);
1011 /* This function is called before section garbage collection to
1012 mark entry symbol sections. */
1014 (struct bfd_link_info *);
1016 /* This function is called during section garbage collection to
1017 mark sections that define global symbols. */
1018 bfd_boolean (*gc_mark_dynamic_ref)
1019 (struct elf_link_hash_entry *, void *);
1021 /* This function is called during section gc to discover the section a
1022 particular relocation refers to. */
1023 elf_gc_mark_hook_fn gc_mark_hook;
1025 /* This function, if defined, is called after the first gc marking pass
1026 to allow the backend to mark additional sections. */
1027 bfd_boolean (*gc_mark_extra_sections)
1028 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1030 /* This function, if defined, is called during the sweep phase of gc
1031 in order that a backend might update any data structures it might
1033 bfd_boolean (*gc_sweep_hook)
1034 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1036 /* This function, if defined, is called after the ELF headers have
1037 been created. This allows for things like the OS and ABI versions
1039 void (*elf_backend_post_process_headers)
1040 (bfd *, struct bfd_link_info *);
1042 /* This function, if defined, prints a symbol to file and returns the
1043 name of the symbol to be printed. It should return NULL to fall
1044 back to default symbol printing. */
1045 const char *(*elf_backend_print_symbol_all)
1046 (bfd *, void *, asymbol *);
1048 /* This function, if defined, is called after all local symbols and
1049 global symbols converted to locals are emitted into the symtab
1050 section. It allows the backend to emit special local symbols
1051 not handled in the hash table. */
1052 bfd_boolean (*elf_backend_output_arch_local_syms)
1053 (bfd *, struct bfd_link_info *, void *,
1054 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1055 struct elf_link_hash_entry *));
1057 /* This function, if defined, is called after all symbols are emitted
1058 into the symtab section. It allows the backend to emit special
1059 global symbols not handled in the hash table. */
1060 bfd_boolean (*elf_backend_output_arch_syms)
1061 (bfd *, struct bfd_link_info *, void *,
1062 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1063 struct elf_link_hash_entry *));
1065 /* Copy any information related to dynamic linking from a pre-existing
1066 symbol to a newly created symbol. Also called to copy flags and
1067 other back-end info to a weakdef, in which case the symbol is not
1068 newly created and plt/got refcounts and dynamic indices should not
1070 void (*elf_backend_copy_indirect_symbol)
1071 (struct bfd_link_info *, struct elf_link_hash_entry *,
1072 struct elf_link_hash_entry *);
1074 /* Modify any information related to dynamic linking such that the
1075 symbol is not exported. */
1076 void (*elf_backend_hide_symbol)
1077 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1079 /* A function to do additional symbol fixup, called by
1080 _bfd_elf_fix_symbol_flags. */
1081 bfd_boolean (*elf_backend_fixup_symbol)
1082 (struct bfd_link_info *, struct elf_link_hash_entry *);
1084 /* Merge the backend specific symbol attribute. */
1085 void (*elf_backend_merge_symbol_attribute)
1086 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1089 /* This function, if defined, will return a string containing the
1090 name of a target-specific dynamic tag. */
1091 char *(*elf_backend_get_target_dtag)
1094 /* Decide whether an undefined symbol is special and can be ignored.
1095 This is the case for OPTIONAL symbols on IRIX. */
1096 bfd_boolean (*elf_backend_ignore_undef_symbol)
1097 (struct elf_link_hash_entry *);
1099 /* Emit relocations. Overrides default routine for emitting relocs,
1100 except during a relocatable link, or if all relocs are being emitted. */
1101 bfd_boolean (*elf_backend_emit_relocs)
1102 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1103 struct elf_link_hash_entry **);
1105 /* Count relocations. Not called for relocatable links
1106 or if all relocs are being preserved in the output. */
1107 unsigned int (*elf_backend_count_relocs)
1108 (struct bfd_link_info *, asection *);
1110 /* This function, if defined, is called when an NT_PRSTATUS note is found
1112 bfd_boolean (*elf_backend_grok_prstatus)
1113 (bfd *, Elf_Internal_Note *);
1115 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1116 note is found in a core file. */
1117 bfd_boolean (*elf_backend_grok_psinfo)
1118 (bfd *, Elf_Internal_Note *);
1120 /* This function, if defined, is called to write a note to a corefile. */
1121 char *(*elf_backend_write_core_note)
1122 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1124 /* This function, if defined, is called to convert target-specific
1125 section flag names into hex values. */
1126 flagword (*elf_backend_lookup_section_flags_hook)
1129 /* This function returns class of a reloc type. */
1130 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1131 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1133 /* This function, if defined, removes information about discarded functions
1134 from other sections which mention them. */
1135 bfd_boolean (*elf_backend_discard_info)
1136 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1138 /* This function, if defined, signals that the function above has removed
1139 the discarded relocations for this section. */
1140 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1143 /* What to do when ld finds relocations against symbols defined in
1144 discarded sections. */
1145 unsigned int (*action_discarded)
1148 /* This function returns the width of FDE pointers in bytes, or 0 if
1149 that can't be determined for some reason. The default definition
1150 goes by the bfd's EI_CLASS. */
1151 unsigned int (*elf_backend_eh_frame_address_size)
1152 (bfd *, asection *);
1154 /* These functions tell elf-eh-frame whether to attempt to turn
1155 absolute or lsda encodings into pc-relative ones. The default
1156 definition enables these transformations. */
1157 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1158 (bfd *, struct bfd_link_info *, asection *);
1159 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1160 (bfd *, struct bfd_link_info *, asection *);
1162 /* This function returns an encoding after computing the encoded
1163 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1164 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1165 The default definition chooses a 32-bit PC-relative encoding. */
1166 bfd_byte (*elf_backend_encode_eh_address)
1167 (bfd *abfd, struct bfd_link_info *info,
1168 asection *osec, bfd_vma offset,
1169 asection *loc_sec, bfd_vma loc_offset,
1172 /* This function, if defined, may write out the given section.
1173 Returns TRUE if it did so and FALSE if the caller should. */
1174 bfd_boolean (*elf_backend_write_section)
1175 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1177 /* The level of IRIX compatibility we're striving for.
1178 MIPS ELF specific function. */
1179 irix_compat_t (*elf_backend_mips_irix_compat)
1182 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1183 (unsigned int, bfd_boolean);
1185 /* The swapping table to use when dealing with ECOFF information.
1186 Used for the MIPS ELF .mdebug section. */
1187 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1189 /* This function implements `bfd_elf_bfd_from_remote_memory';
1190 see elf.c, elfcode.h. */
1191 bfd *(*elf_backend_bfd_from_remote_memory)
1192 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1193 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1194 bfd_size_type len));
1196 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1198 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1200 /* Is symbol defined in common section? */
1201 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1203 /* Return a common section index for section. */
1204 unsigned int (*common_section_index) (asection *);
1206 /* Return a common section for section. */
1207 asection *(*common_section) (asection *);
1209 /* Return TRUE if we can merge 2 definitions. */
1210 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1211 const Elf_Internal_Sym *, asection **,
1212 bfd_boolean, bfd_boolean,
1213 bfd *, const asection *);
1215 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1216 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1218 /* Return TRUE if type is a function symbol type. */
1219 bfd_boolean (*is_function_type) (unsigned int type);
1221 /* If the ELF symbol SYM might be a function in SEC, return the
1222 function size and set *CODE_OFF to the function's entry point,
1223 otherwise return zero. */
1224 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1227 /* Used to handle bad SHF_LINK_ORDER input. */
1228 bfd_error_handler_type link_order_error_handler;
1230 /* Name of the PLT relocation section. */
1231 const char *relplt_name;
1233 /* Alternate EM_xxxx machine codes for this backend. */
1234 int elf_machine_alt1;
1235 int elf_machine_alt2;
1237 const struct elf_size_info *s;
1239 /* An array of target specific special sections. */
1240 const struct bfd_elf_special_section *special_sections;
1242 /* The size in bytes of the header for the GOT. This includes the
1243 so-called reserved entries on some systems. */
1244 bfd_vma got_header_size;
1246 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1247 otherwise by the local symbol with index SYMNDX in IBFD. */
1248 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1249 struct elf_link_hash_entry *h,
1250 bfd *ibfd, unsigned long symndx);
1252 /* The vendor name to use for a processor-standard attributes section. */
1253 const char *obj_attrs_vendor;
1255 /* The section name to use for a processor-standard attributes section. */
1256 const char *obj_attrs_section;
1258 /* Return 1, 2 or 3 to indicate what type of arguments a
1259 processor-specific tag takes. */
1260 int (*obj_attrs_arg_type) (int);
1262 /* The section type to use for an attributes section. */
1263 unsigned int obj_attrs_section_type;
1265 /* This function determines the order in which any attributes are
1266 written. It must be defined for input in the range
1267 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1268 is used in order to make unity easy). The returned value is the
1269 actual tag number to place in the input position. */
1270 int (*obj_attrs_order) (int);
1272 /* Handle merging unknown attributes; either warn and return TRUE,
1273 or give an error and return FALSE. */
1274 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1276 /* This is non-zero if static TLS segments require a special alignment. */
1277 unsigned static_tls_alignment;
1279 /* Alignment for the PT_GNU_STACK segment. */
1280 unsigned stack_align;
1282 /* This is TRUE if the linker should act like collect and gather
1283 global constructors and destructors by name. This is TRUE for
1284 MIPS ELF because the Irix 5 tools can not handle the .init
1286 unsigned collect : 1;
1288 /* This is TRUE if the linker should ignore changes to the type of a
1289 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1290 record undefined functions as STT_OBJECT although the definitions
1292 unsigned type_change_ok : 1;
1294 /* Whether the backend may use REL relocations. (Some backends use
1295 both REL and RELA relocations, and this flag is set for those
1297 unsigned may_use_rel_p : 1;
1299 /* Whether the backend may use RELA relocations. (Some backends use
1300 both REL and RELA relocations, and this flag is set for those
1302 unsigned may_use_rela_p : 1;
1304 /* Whether the default relocation type is RELA. If a backend with
1305 this flag set wants REL relocations for a particular section,
1306 it must note that explicitly. Similarly, if this flag is clear,
1307 and the backend wants RELA relocations for a particular
1309 unsigned default_use_rela_p : 1;
1311 /* True if PLT and copy relocations should be RELA by default. */
1312 unsigned rela_plts_and_copies_p : 1;
1314 /* Set if RELA relocations for a relocatable link can be handled by
1315 generic code. Backends that set this flag need do nothing in the
1316 backend relocate_section routine for relocatable linking. */
1317 unsigned rela_normal : 1;
1319 /* TRUE if addresses "naturally" sign extend. This is used when
1320 swapping in from Elf32 when BFD64. */
1321 unsigned sign_extend_vma : 1;
1323 unsigned want_got_plt : 1;
1324 unsigned plt_readonly : 1;
1325 unsigned want_plt_sym : 1;
1326 unsigned plt_not_loaded : 1;
1327 unsigned plt_alignment : 4;
1328 unsigned can_gc_sections : 1;
1329 unsigned can_refcount : 1;
1330 unsigned want_got_sym : 1;
1331 unsigned want_dynbss : 1;
1333 /* Targets which do not support physical addressing often require
1334 that the p_paddr field in the section header to be set to zero.
1335 This field indicates whether this behavior is required. */
1336 unsigned want_p_paddr_set_to_zero : 1;
1338 /* True if an object file lacking a .note.GNU-stack section
1339 should be assumed to be requesting exec stack. At least one
1340 other file in the link needs to have a .note.GNU-stack section
1341 for a PT_GNU_STACK segment to be created. */
1342 unsigned default_execstack : 1;
1344 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1345 in length rather than sec->size in length, if sec->rawsize is
1346 non-zero and smaller than sec->size. */
1347 unsigned caches_rawsize : 1;
1350 /* Information about reloc sections associated with a bfd_elf_section_data
1352 struct bfd_elf_section_reloc_data
1354 /* The ELF header for the reloc section associated with this
1356 Elf_Internal_Shdr *hdr;
1357 /* The number of relocations currently assigned to HDR. */
1359 /* The ELF section number of the reloc section. Only used for an
1362 /* Used by the backend linker to store the symbol hash table entries
1363 associated with relocs against global symbols. */
1364 struct elf_link_hash_entry **hashes;
1367 /* Information stored for each BFD section in an ELF file. This
1368 structure is allocated by elf_new_section_hook. */
1370 struct bfd_elf_section_data
1372 /* The ELF header for this section. */
1373 Elf_Internal_Shdr this_hdr;
1375 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1376 struct flag_info *section_flag_info;
1378 /* Information about the REL and RELA reloc sections associated
1379 with this section, if any. */
1380 struct bfd_elf_section_reloc_data rel, rela;
1382 /* The ELF section number of this section. */
1385 /* Used by the backend linker when generating a shared library to
1386 record the dynamic symbol index for a section symbol
1387 corresponding to this section. A value of 0 means that there is
1388 no dynamic symbol for this section. */
1391 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1392 asection *linked_to;
1394 /* A pointer to the swapped relocs. If the section uses REL relocs,
1395 rather than RELA, all the r_addend fields will be zero. This
1396 pointer may be NULL. It is used by the backend linker. */
1397 Elf_Internal_Rela *relocs;
1399 /* A pointer to a linked list tracking dynamic relocs copied for
1403 /* A pointer to the bfd section used for dynamic relocs. */
1407 /* Group name, if this section is a member of a group. */
1410 /* Group signature sym, if this is the SHT_GROUP section. */
1411 struct bfd_symbol *id;
1414 /* For a member of a group, points to the SHT_GROUP section.
1415 NULL for the SHT_GROUP section itself and non-group sections. */
1416 asection *sec_group;
1418 /* A linked list of member sections in the group. Circular when used by
1419 the linker. For the SHT_GROUP section, points at first member. */
1420 asection *next_in_group;
1422 /* The FDEs associated with this section. The u.fde.next_in_section
1423 field acts as a chain pointer. */
1424 struct eh_cie_fde *fde_list;
1426 /* A pointer used for various section optimizations. */
1430 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1431 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1432 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1433 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1434 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1435 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1436 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1437 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1438 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1440 #define xvec_get_elf_backend_data(xvec) \
1441 ((const struct elf_backend_data *) (xvec)->backend_data)
1443 #define get_elf_backend_data(abfd) \
1444 xvec_get_elf_backend_data ((abfd)->xvec)
1446 /* The least object attributes (within an attributes subsection) known
1447 for any target. Some code assumes that the value 0 is not used and
1448 the field for that attribute can instead be used as a marker to
1449 indicate that attributes have been initialized. */
1450 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1452 /* The maximum number of known object attributes for any target. */
1453 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1455 /* The value of an object attribute. The type indicates whether the attribute
1456 holds and integer, a string, or both. It can also indicate that there can
1457 be no default (i.e. all values must be written to file, even zero). */
1459 typedef struct obj_attribute
1461 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1462 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1463 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1465 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1466 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1467 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1474 typedef struct obj_attribute_list
1476 struct obj_attribute_list *next;
1479 } obj_attribute_list;
1481 /* Object attributes may either be defined by the processor ABI, index
1482 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1483 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1484 #define OBJ_ATTR_PROC 0
1485 #define OBJ_ATTR_GNU 1
1486 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1487 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1489 /* The following object attribute tags are taken as generic, for all
1490 targets and for "gnu" where there is no target standard. */
1497 Tag_compatibility = 32
1500 /* The following struct stores information about every SystemTap section
1501 found in the object file. */
1504 struct sdt_note *next;
1509 /* NT_GNU_BUILD_ID note type info for input BFDs. */
1516 /* tdata information grabbed from an elf core file. */
1517 struct core_elf_obj_tdata
1526 /* Extra tdata information held for output ELF BFDs. */
1527 struct output_elf_obj_tdata
1529 struct elf_segment_map *seg_map;
1530 struct elf_strtab_hash *strtab_ptr;
1532 /* STT_SECTION symbols for each section */
1533 asymbol **section_syms;
1535 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1537 asection *eh_frame_hdr;
1539 /* NT_GNU_BUILD_ID note type info. */
1542 bfd_boolean (*after_write_object_contents) (bfd *);
1547 /* Records the result of `get_program_header_size'. */
1548 bfd_size_type program_header_size;
1550 /* Used when laying out sections. */
1551 file_ptr next_file_pos;
1553 int num_section_syms;
1554 unsigned int shstrtab_section, strtab_section;
1556 /* Segment flags for the PT_GNU_STACK segment. */
1557 unsigned int stack_flags;
1559 /* This is set to TRUE if the object was created by the backend
1563 /* Used to determine if the e_flags field has been initialized */
1564 bfd_boolean flags_init;
1567 /* Some private data is stashed away for future use using the tdata pointer
1568 in the bfd structure. */
1570 struct elf_obj_tdata
1572 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1573 Elf_Internal_Shdr **elf_sect_ptr;
1574 Elf_Internal_Phdr *phdr;
1575 Elf_Internal_Shdr symtab_hdr;
1576 Elf_Internal_Shdr shstrtab_hdr;
1577 Elf_Internal_Shdr strtab_hdr;
1578 Elf_Internal_Shdr dynsymtab_hdr;
1579 Elf_Internal_Shdr dynstrtab_hdr;
1580 Elf_Internal_Shdr dynversym_hdr;
1581 Elf_Internal_Shdr dynverref_hdr;
1582 Elf_Internal_Shdr dynverdef_hdr;
1583 Elf_Internal_Shdr symtab_shndx_hdr;
1584 bfd_vma gp; /* The gp value */
1585 unsigned int gp_size; /* The gp size */
1586 unsigned int num_elf_sections; /* elf_sect_ptr size */
1588 /* A mapping from external symbols to entries in the linker hash
1589 table, used when linking. This is indexed by the symbol index
1590 minus the sh_info field of the symbol table header. */
1591 struct elf_link_hash_entry **sym_hashes;
1593 /* Track usage and final offsets of GOT entries for local symbols.
1594 This array is indexed by symbol index. Elements are used
1595 identically to "got" in struct elf_link_hash_entry. */
1598 bfd_signed_vma *refcounts;
1600 struct got_entry **ents;
1603 /* The linker ELF emulation code needs to let the backend ELF linker
1604 know what filename should be used for a dynamic object if the
1605 dynamic object is found using a search. The emulation code then
1606 sometimes needs to know what name was actually used. Until the
1607 file has been added to the linker symbol table, this field holds
1608 the name the linker wants. After it has been added, it holds the
1609 name actually used, which will be the DT_SONAME entry if there is
1611 const char *dt_name;
1613 /* The linker emulation needs to know what audit libs
1614 are used by a dynamic object. */
1615 const char *dt_audit;
1617 /* Used by find_nearest_line entry point. */
1620 /* A place to stash dwarf1 info for this bfd. */
1621 struct dwarf1_debug *dwarf1_find_line_info;
1623 /* A place to stash dwarf2 info for this bfd. */
1624 void *dwarf2_find_line_info;
1626 /* Stash away info for yet another find line/function variant. */
1627 void *elf_find_function_cache;
1629 /* Number of symbol version definitions we are about to emit. */
1630 unsigned int cverdefs;
1632 /* Number of symbol version references we are about to emit. */
1633 unsigned int cverrefs;
1635 /* Symbol version definitions in external objects. */
1636 Elf_Internal_Verdef *verdef;
1638 /* Symbol version references to external objects. */
1639 Elf_Internal_Verneed *verref;
1641 /* A pointer to the .eh_frame section. */
1642 asection *eh_frame_section;
1644 /* Symbol buffer. */
1647 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1648 obj_attribute_list *other_obj_attributes[2];
1650 /* NT_GNU_BUILD_ID note type. */
1651 struct elf_build_id *build_id;
1653 /* Linked-list containing information about every Systemtap section
1654 found in the object file. Each section corresponds to one entry
1656 struct sdt_note *sdt_note_head;
1658 Elf_Internal_Shdr **group_sect_ptr;
1661 unsigned int symtab_section, symtab_shndx_section, dynsymtab_section;
1662 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1664 /* An identifier used to distinguish different target
1665 specific extensions to this structure. */
1666 enum elf_target_id object_id;
1668 /* Whether a dyanmic object was specified normally on the linker
1669 command line, or was specified when --as-needed was in effect,
1670 or was found via a DT_NEEDED entry. */
1671 enum dynamic_lib_link_class dyn_lib_class;
1673 /* Irix 5 often screws up the symbol table, sorting local symbols
1674 after global symbols. This flag is set if the symbol table in
1675 this BFD appears to be screwed up. If it is, we ignore the
1676 sh_info field in the symbol table header, and always read all the
1678 bfd_boolean bad_symtab;
1680 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1681 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1682 field in the ELF header structure. */
1683 bfd_boolean has_gnu_symbols;
1685 /* Information grabbed from an elf core file. */
1686 struct core_elf_obj_tdata *core;
1688 /* More information held for output ELF BFDs. */
1689 struct output_elf_obj_tdata *o;
1692 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1694 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1695 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1696 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1697 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1698 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1699 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1700 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1701 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1702 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker)
1703 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1704 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1705 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1706 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1707 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1708 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1709 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1710 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1711 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1712 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1713 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1714 #define elf_eh_frame_section(bfd) \
1715 (elf_tdata(bfd) -> eh_frame_section)
1716 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1717 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1718 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1719 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1720 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1721 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1722 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1723 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1724 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1725 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1726 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1727 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1728 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1729 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1730 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
1731 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1732 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1733 #define elf_known_obj_attributes_proc(bfd) \
1734 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1735 #define elf_other_obj_attributes_proc(bfd) \
1736 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1738 extern void _bfd_elf_swap_verdef_in
1739 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1740 extern void _bfd_elf_swap_verdef_out
1741 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1742 extern void _bfd_elf_swap_verdaux_in
1743 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1744 extern void _bfd_elf_swap_verdaux_out
1745 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1746 extern void _bfd_elf_swap_verneed_in
1747 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1748 extern void _bfd_elf_swap_verneed_out
1749 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1750 extern void _bfd_elf_swap_vernaux_in
1751 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1752 extern void _bfd_elf_swap_vernaux_out
1753 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1754 extern void _bfd_elf_swap_versym_in
1755 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1756 extern void _bfd_elf_swap_versym_out
1757 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1759 extern unsigned int _bfd_elf_section_from_bfd_section
1760 (bfd *, asection *);
1761 extern char *bfd_elf_string_from_elf_section
1762 (bfd *, unsigned, unsigned);
1763 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1764 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1765 Elf_External_Sym_Shndx *);
1766 extern const char *bfd_elf_sym_name
1767 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1769 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1771 extern bfd_boolean _bfd_elf_print_private_bfd_data
1773 extern void bfd_elf_print_symbol
1774 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1776 extern unsigned int _bfd_elf_eh_frame_address_size
1777 (bfd *, asection *);
1778 extern bfd_byte _bfd_elf_encode_eh_address
1779 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1780 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1781 extern bfd_boolean _bfd_elf_can_make_relative
1782 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1784 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1785 (const struct bfd_link_info *, const asection *,
1786 const Elf_Internal_Rela *);
1787 extern bfd_vma _bfd_elf_rela_local_sym
1788 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1789 extern bfd_vma _bfd_elf_rel_local_sym
1790 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1791 extern bfd_vma _bfd_elf_section_offset
1792 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1794 extern unsigned long bfd_elf_hash
1796 extern unsigned long bfd_elf_gnu_hash
1799 extern bfd_reloc_status_type bfd_elf_generic_reloc
1800 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1801 extern bfd_boolean bfd_elf_allocate_object
1802 (bfd *, size_t, enum elf_target_id);
1803 extern bfd_boolean bfd_elf_make_object
1805 extern bfd_boolean bfd_elf_mkcorefile
1807 extern bfd_boolean _bfd_elf_make_section_from_shdr
1808 (bfd *, Elf_Internal_Shdr *, const char *, int);
1809 extern bfd_boolean _bfd_elf_make_section_from_phdr
1810 (bfd *, Elf_Internal_Phdr *, int, const char *);
1811 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1812 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1813 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1815 extern void _bfd_elf_link_hash_table_free
1817 extern void _bfd_elf_link_hash_copy_indirect
1818 (struct bfd_link_info *, struct elf_link_hash_entry *,
1819 struct elf_link_hash_entry *);
1820 extern void _bfd_elf_link_hash_hide_symbol
1821 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1822 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1823 (struct bfd_link_info *, struct elf_link_hash_entry *);
1824 extern bfd_boolean _bfd_elf_link_hash_table_init
1825 (struct elf_link_hash_table *, bfd *,
1826 struct bfd_hash_entry *(*)
1827 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1828 unsigned int, enum elf_target_id);
1829 extern bfd_boolean _bfd_elf_slurp_version_tables
1830 (bfd *, bfd_boolean);
1831 extern bfd_boolean _bfd_elf_merge_sections
1832 (bfd *, struct bfd_link_info *);
1833 extern bfd_boolean _bfd_elf_match_sections_by_type
1834 (bfd *, const asection *, bfd *, const asection *);
1835 extern bfd_boolean bfd_elf_is_group_section
1836 (bfd *, const struct bfd_section *);
1837 extern bfd_boolean _bfd_elf_section_already_linked
1838 (bfd *, asection *, struct bfd_link_info *);
1839 extern void bfd_elf_set_group_contents
1840 (bfd *, asection *, void *);
1841 extern asection *_bfd_elf_check_kept_section
1842 (asection *, struct bfd_link_info *);
1843 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
1844 extern void _bfd_elf_copy_link_hash_symbol_type
1845 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1846 extern bfd_boolean _bfd_elf_size_group_sections
1847 (struct bfd_link_info *);
1848 extern bfd_boolean _bfd_elf_fixup_group_sections
1849 (bfd *, asection *);
1850 extern bfd_boolean _bfd_elf_copy_private_header_data
1852 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1853 (bfd *, asymbol *, bfd *, asymbol *);
1854 #define _bfd_generic_init_private_section_data \
1855 _bfd_elf_init_private_section_data
1856 extern bfd_boolean _bfd_elf_init_private_section_data
1857 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1858 extern bfd_boolean _bfd_elf_copy_private_section_data
1859 (bfd *, asection *, bfd *, asection *);
1860 extern bfd_boolean _bfd_elf_write_object_contents
1862 extern bfd_boolean _bfd_elf_write_corefile_contents
1864 extern bfd_boolean _bfd_elf_set_section_contents
1865 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1866 extern long _bfd_elf_get_symtab_upper_bound
1868 extern long _bfd_elf_canonicalize_symtab
1869 (bfd *, asymbol **);
1870 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1872 extern long _bfd_elf_canonicalize_dynamic_symtab
1873 (bfd *, asymbol **);
1874 extern long _bfd_elf_get_synthetic_symtab
1875 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1876 extern long _bfd_elf_get_reloc_upper_bound
1878 extern long _bfd_elf_canonicalize_reloc
1879 (bfd *, sec_ptr, arelent **, asymbol **);
1880 extern asection * _bfd_elf_get_dynamic_reloc_section
1881 (bfd *, asection *, bfd_boolean);
1882 extern asection * _bfd_elf_make_dynamic_reloc_section
1883 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1884 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1886 extern long _bfd_elf_canonicalize_dynamic_reloc
1887 (bfd *, arelent **, asymbol **);
1888 extern asymbol *_bfd_elf_make_empty_symbol
1890 extern void _bfd_elf_get_symbol_info
1891 (bfd *, asymbol *, symbol_info *);
1892 extern bfd_boolean _bfd_elf_is_local_label_name
1893 (bfd *, const char *);
1894 extern alent *_bfd_elf_get_lineno
1896 extern bfd_boolean _bfd_elf_set_arch_mach
1897 (bfd *, enum bfd_architecture, unsigned long);
1898 extern bfd_boolean _bfd_elf_find_nearest_line
1899 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1901 extern bfd_boolean _bfd_elf_find_nearest_line_discriminator
1902 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1903 unsigned int *, unsigned int *);
1904 extern bfd_boolean _bfd_elf_find_line
1905 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1906 extern bfd_boolean _bfd_elf_find_line_discriminator
1907 (bfd *, asymbol **, asymbol *, const char **, unsigned int *, unsigned int *);
1908 #define _bfd_generic_find_line _bfd_elf_find_line
1909 #define _bfd_generic_find_nearest_line_discriminator \
1910 _bfd_elf_find_nearest_line_discriminator
1911 extern bfd_boolean _bfd_elf_find_inliner_info
1912 (bfd *, const char **, const char **, unsigned int *);
1913 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1914 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1915 extern int _bfd_elf_sizeof_headers
1916 (bfd *, struct bfd_link_info *);
1917 extern bfd_boolean _bfd_elf_new_section_hook
1918 (bfd *, asection *);
1919 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1920 (const char *, const struct bfd_elf_special_section *, unsigned int);
1921 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1922 (bfd *, asection *);
1924 /* If the target doesn't have reloc handling written yet: */
1925 extern void _bfd_elf_no_info_to_howto
1926 (bfd *, arelent *, Elf_Internal_Rela *);
1928 extern bfd_boolean bfd_section_from_shdr
1929 (bfd *, unsigned int shindex);
1930 extern bfd_boolean bfd_section_from_phdr
1931 (bfd *, Elf_Internal_Phdr *, int);
1933 extern int _bfd_elf_symbol_from_bfd_symbol
1934 (bfd *, asymbol **);
1936 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1937 (struct sym_cache *, bfd *, unsigned long);
1938 extern asection *bfd_section_from_elf_index
1939 (bfd *, unsigned int);
1940 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1943 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1945 extern void _bfd_elf_strtab_free
1946 (struct elf_strtab_hash *);
1947 extern bfd_size_type _bfd_elf_strtab_add
1948 (struct elf_strtab_hash *, const char *, bfd_boolean);
1949 extern void _bfd_elf_strtab_addref
1950 (struct elf_strtab_hash *, bfd_size_type);
1951 extern void _bfd_elf_strtab_delref
1952 (struct elf_strtab_hash *, bfd_size_type);
1953 extern unsigned int _bfd_elf_strtab_refcount
1954 (struct elf_strtab_hash *, bfd_size_type);
1955 extern void _bfd_elf_strtab_clear_all_refs
1956 (struct elf_strtab_hash *tab);
1957 extern void _bfd_elf_strtab_restore_size
1958 (struct elf_strtab_hash *, bfd_size_type);
1959 extern bfd_size_type _bfd_elf_strtab_size
1960 (struct elf_strtab_hash *);
1961 extern bfd_size_type _bfd_elf_strtab_offset
1962 (struct elf_strtab_hash *, bfd_size_type);
1963 extern bfd_boolean _bfd_elf_strtab_emit
1964 (bfd *, struct elf_strtab_hash *);
1965 extern void _bfd_elf_strtab_finalize
1966 (struct elf_strtab_hash *);
1968 extern void _bfd_elf_parse_eh_frame
1969 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1970 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1971 (bfd *, struct bfd_link_info *, asection *,
1972 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1973 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1974 (bfd *, struct bfd_link_info *);
1975 extern bfd_vma _bfd_elf_eh_frame_section_offset
1976 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1977 extern bfd_boolean _bfd_elf_write_section_eh_frame
1978 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1979 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1980 (bfd *, struct bfd_link_info *);
1981 extern bfd_boolean _bfd_elf_eh_frame_present
1982 (struct bfd_link_info *);
1983 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1984 (struct bfd_link_info *);
1986 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1988 extern long _bfd_elf_link_lookup_local_dynindx
1989 (struct bfd_link_info *, bfd *, long);
1990 extern bfd_boolean _bfd_elf_compute_section_file_positions
1991 (bfd *, struct bfd_link_info *);
1992 extern file_ptr _bfd_elf_assign_file_position_for_section
1993 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1995 extern bfd_boolean _bfd_elf_validate_reloc
1998 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1999 (bfd *, struct bfd_link_info *);
2000 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2001 (bfd *, struct bfd_link_info *, asection *);
2002 extern bfd_boolean _bfd_elf_create_dynamic_sections
2003 (bfd *, struct bfd_link_info *);
2004 extern bfd_boolean _bfd_elf_create_got_section
2005 (bfd *, struct bfd_link_info *);
2006 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2007 (bfd *, struct bfd_link_info *, asection *, const char *);
2008 extern void _bfd_elf_init_1_index_section
2009 (bfd *, struct bfd_link_info *);
2010 extern void _bfd_elf_init_2_index_sections
2011 (bfd *, struct bfd_link_info *);
2013 extern bfd_boolean _bfd_elfcore_make_pseudosection
2014 (bfd *, char *, size_t, ufile_ptr);
2015 extern char *_bfd_elfcore_strndup
2016 (bfd *, char *, size_t);
2018 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2019 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2021 extern bfd_boolean _bfd_elf_link_output_relocs
2022 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2023 struct elf_link_hash_entry **);
2025 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2026 (struct elf_link_hash_entry *, asection *);
2028 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2029 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2031 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2032 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2034 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2035 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2037 extern bfd_boolean _bfd_elf_setup_sections
2040 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
2042 extern const bfd_target *bfd_elf32_object_p
2044 extern const bfd_target *bfd_elf32_core_file_p
2046 extern char *bfd_elf32_core_file_failing_command
2048 extern int bfd_elf32_core_file_failing_signal
2050 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2052 extern int bfd_elf32_core_file_pid
2055 extern bfd_boolean bfd_elf32_swap_symbol_in
2056 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2057 extern void bfd_elf32_swap_symbol_out
2058 (bfd *, const Elf_Internal_Sym *, void *, void *);
2059 extern void bfd_elf32_swap_reloc_in
2060 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2061 extern void bfd_elf32_swap_reloc_out
2062 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2063 extern void bfd_elf32_swap_reloca_in
2064 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2065 extern void bfd_elf32_swap_reloca_out
2066 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2067 extern void bfd_elf32_swap_phdr_in
2068 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2069 extern void bfd_elf32_swap_phdr_out
2070 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2071 extern void bfd_elf32_swap_dyn_in
2072 (bfd *, const void *, Elf_Internal_Dyn *);
2073 extern void bfd_elf32_swap_dyn_out
2074 (bfd *, const Elf_Internal_Dyn *, void *);
2075 extern long bfd_elf32_slurp_symbol_table
2076 (bfd *, asymbol **, bfd_boolean);
2077 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2079 extern int bfd_elf32_write_out_phdrs
2080 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2081 extern bfd_boolean bfd_elf32_checksum_contents
2082 (bfd * , void (*) (const void *, size_t, void *), void *);
2083 extern void bfd_elf32_write_relocs
2084 (bfd *, asection *, void *);
2085 extern bfd_boolean bfd_elf32_slurp_reloc_table
2086 (bfd *, asection *, asymbol **, bfd_boolean);
2088 extern const bfd_target *bfd_elf64_object_p
2090 extern const bfd_target *bfd_elf64_core_file_p
2092 extern char *bfd_elf64_core_file_failing_command
2094 extern int bfd_elf64_core_file_failing_signal
2096 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2098 extern int bfd_elf64_core_file_pid
2101 extern bfd_boolean bfd_elf64_swap_symbol_in
2102 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2103 extern void bfd_elf64_swap_symbol_out
2104 (bfd *, const Elf_Internal_Sym *, void *, void *);
2105 extern void bfd_elf64_swap_reloc_in
2106 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2107 extern void bfd_elf64_swap_reloc_out
2108 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2109 extern void bfd_elf64_swap_reloca_in
2110 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2111 extern void bfd_elf64_swap_reloca_out
2112 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2113 extern void bfd_elf64_swap_phdr_in
2114 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2115 extern void bfd_elf64_swap_phdr_out
2116 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2117 extern void bfd_elf64_swap_dyn_in
2118 (bfd *, const void *, Elf_Internal_Dyn *);
2119 extern void bfd_elf64_swap_dyn_out
2120 (bfd *, const Elf_Internal_Dyn *, void *);
2121 extern long bfd_elf64_slurp_symbol_table
2122 (bfd *, asymbol **, bfd_boolean);
2123 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2125 extern int bfd_elf64_write_out_phdrs
2126 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2127 extern bfd_boolean bfd_elf64_checksum_contents
2128 (bfd * , void (*) (const void *, size_t, void *), void *);
2129 extern void bfd_elf64_write_relocs
2130 (bfd *, asection *, void *);
2131 extern bfd_boolean bfd_elf64_slurp_reloc_table
2132 (bfd *, asection *, asymbol **, bfd_boolean);
2134 extern bfd_boolean _bfd_elf_default_relocs_compatible
2135 (const bfd_target *, const bfd_target *);
2137 extern bfd_boolean _bfd_elf_relocs_compatible
2138 (const bfd_target *, const bfd_target *);
2139 extern bfd_boolean _bfd_elf_notice_as_needed
2140 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2142 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2143 (bfd *, struct bfd_link_info *, const char *);
2144 extern bfd_boolean bfd_elf_link_add_symbols
2145 (bfd *, struct bfd_link_info *);
2146 extern bfd_boolean _bfd_elf_add_dynamic_entry
2147 (struct bfd_link_info *, bfd_vma, bfd_vma);
2149 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2150 (struct bfd_link_info *, struct elf_link_hash_entry *);
2152 extern int bfd_elf_link_record_local_dynamic_symbol
2153 (struct bfd_link_info *, bfd *, long);
2155 extern bfd_boolean _bfd_elf_close_and_cleanup
2158 extern bfd_boolean _bfd_elf_common_definition
2159 (Elf_Internal_Sym *);
2161 extern unsigned int _bfd_elf_common_section_index
2164 extern asection *_bfd_elf_common_section
2167 extern bfd_vma _bfd_elf_default_got_elt_size
2168 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2171 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2172 (bfd *, arelent *, struct bfd_symbol *, void *,
2173 asection *, bfd *, char **);
2175 extern bfd_boolean bfd_elf_final_link
2176 (bfd *, struct bfd_link_info *);
2178 extern void _bfd_elf_gc_keep
2179 (struct bfd_link_info *info);
2181 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2182 (struct elf_link_hash_entry *h, void *inf);
2184 extern bfd_boolean bfd_elf_gc_sections
2185 (bfd *, struct bfd_link_info *);
2187 extern bfd_boolean bfd_elf_gc_record_vtinherit
2188 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2190 extern bfd_boolean bfd_elf_gc_record_vtentry
2191 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2193 extern asection *_bfd_elf_gc_mark_hook
2194 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2195 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2197 extern asection *_bfd_elf_gc_mark_rsec
2198 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2199 struct elf_reloc_cookie *);
2201 extern bfd_boolean _bfd_elf_gc_mark_reloc
2202 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2203 struct elf_reloc_cookie *);
2205 extern bfd_boolean _bfd_elf_gc_mark_fdes
2206 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2207 struct elf_reloc_cookie *);
2209 extern bfd_boolean _bfd_elf_gc_mark
2210 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2212 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2213 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2215 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2216 (bfd *, struct bfd_link_info *);
2218 extern bfd_boolean bfd_elf_gc_common_final_link
2219 (bfd *, struct bfd_link_info *);
2221 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2224 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2225 (bfd *, asection *);
2227 extern bfd_boolean _bfd_elf_map_sections_to_segments
2228 (bfd *, struct bfd_link_info *);
2230 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2232 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2235 extern int bfd_elf_get_default_section_type (flagword);
2237 extern bfd_boolean bfd_elf_lookup_section_flags
2238 (struct bfd_link_info *, struct flag_info *, asection *);
2240 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2241 (bfd * abfd, asection * section);
2243 /* Exported interface for writing elf corefile notes. */
2244 extern char *elfcore_write_note
2245 (bfd *, char *, int *, const char *, int, const void *, int);
2246 extern char *elfcore_write_prpsinfo
2247 (bfd *, char *, int *, const char *, const char *);
2248 extern char *elfcore_write_prstatus
2249 (bfd *, char *, int *, long, int, const void *);
2250 extern char * elfcore_write_pstatus
2251 (bfd *, char *, int *, long, int, const void *);
2252 extern char *elfcore_write_prfpreg
2253 (bfd *, char *, int *, const void *, int);
2254 extern char *elfcore_write_prxfpreg
2255 (bfd *, char *, int *, const void *, int);
2256 extern char *elfcore_write_xstatereg
2257 (bfd *, char *, int *, const void *, int);
2258 extern char *elfcore_write_ppc_vmx
2259 (bfd *, char *, int *, const void *, int);
2260 extern char *elfcore_write_ppc_vsx
2261 (bfd *, char *, int *, const void *, int);
2262 extern char *elfcore_write_s390_timer
2263 (bfd *, char *, int *, const void *, int);
2264 extern char *elfcore_write_s390_todcmp
2265 (bfd *, char *, int *, const void *, int);
2266 extern char *elfcore_write_s390_todpreg
2267 (bfd *, char *, int *, const void *, int);
2268 extern char *elfcore_write_s390_ctrs
2269 (bfd *, char *, int *, const void *, int);
2270 extern char *elfcore_write_s390_prefix
2271 (bfd *, char *, int *, const void *, int);
2272 extern char *elfcore_write_s390_last_break
2273 (bfd *, char *, int *, const void *, int);
2274 extern char *elfcore_write_s390_system_call
2275 (bfd *, char *, int *, const void *, int);
2276 extern char *elfcore_write_s390_tdb
2277 (bfd *, char *, int *, const void *, int);
2278 extern char *elfcore_write_arm_vfp
2279 (bfd *, char *, int *, const void *, int);
2280 extern char *elfcore_write_aarch_tls
2281 (bfd *, char *, int *, const void *, int);
2282 extern char *elfcore_write_aarch_hw_break
2283 (bfd *, char *, int *, const void *, int);
2284 extern char *elfcore_write_aarch_hw_watch
2285 (bfd *, char *, int *, const void *, int);
2286 extern char *elfcore_write_lwpstatus
2287 (bfd *, char *, int *, long, int, const void *);
2288 extern char *elfcore_write_register_note
2289 (bfd *, char *, int *, const char *, const void *, int);
2291 /* Internal structure which holds information to be included in the
2292 PRPSINFO section of Linux core files.
2294 This is an "internal" structure in the sense that it should be used
2295 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2296 function), so things like endianess shouldn't be an issue. This
2297 structure will eventually be converted in one of the
2298 `elf_external_linux_*' structures and written out to an output bfd
2299 by one of the functions declared below. */
2301 struct elf_internal_linux_prpsinfo
2303 char pr_state; /* Numeric process state. */
2304 char pr_sname; /* Char for pr_state. */
2305 char pr_zomb; /* Zombie. */
2306 char pr_nice; /* Nice val. */
2307 unsigned long pr_flag; /* Flags. */
2308 unsigned int pr_uid;
2309 unsigned int pr_gid;
2310 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2311 char pr_fname[16 + 1]; /* Filename of executable. */
2312 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2315 /* Linux/most 32-bit archs. */
2316 extern char *elfcore_write_linux_prpsinfo32
2317 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2319 /* Linux/most 64-bit archs. */
2320 extern char *elfcore_write_linux_prpsinfo64
2321 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2323 /* Linux/PPC32 uses different layout compared to most archs. */
2324 extern char *elfcore_write_ppc_linux_prpsinfo32
2325 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2327 extern bfd *_bfd_elf32_bfd_from_remote_memory
2328 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2329 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2330 extern bfd *_bfd_elf64_bfd_from_remote_memory
2331 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2332 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2334 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2335 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2336 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2337 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2338 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2339 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2340 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2341 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2342 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2343 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2345 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2346 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2349 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2350 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2351 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2352 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2353 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2354 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2355 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2356 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2358 /* The linker may need to keep track of the number of relocs that it
2359 decides to copy as dynamic relocs in check_relocs for each symbol.
2360 This is so that it can later discard them if they are found to be
2361 unnecessary. We can store the information in a field extending the
2362 regular ELF linker hash table. */
2364 struct elf_dyn_relocs
2366 struct elf_dyn_relocs *next;
2368 /* The input section of the reloc. */
2371 /* Total number of relocs copied for the input section. */
2372 bfd_size_type count;
2374 /* Number of pc-relative relocs copied for the input section. */
2375 bfd_size_type pc_count;
2378 extern bfd_boolean _bfd_elf_create_ifunc_sections
2379 (bfd *, struct bfd_link_info *);
2380 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2381 (struct bfd_link_info *, struct elf_link_hash_entry *,
2382 struct elf_dyn_relocs **, unsigned int, unsigned int, unsigned int);
2384 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2385 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2387 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2388 extern bfd_vma elf64_r_sym (bfd_vma);
2389 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2390 extern bfd_vma elf32_r_sym (bfd_vma);
2392 /* Large common section. */
2393 extern asection _bfd_elf_large_com_section;
2395 /* Hash for local symbol with the first section id, ID, in the input
2396 file and the local symbol index, SYM. */
2397 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2398 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2399 ^ (SYM) ^ ((ID) >> 16))
2401 /* This is the condition under which finish_dynamic_symbol will be called.
2402 If our finish_dynamic_symbol isn't called, we'll need to do something
2403 about initializing any .plt and .got entries in relocate_section. */
2404 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2406 && ((SHARED) || !(H)->forced_local) \
2407 && ((H)->dynindx != -1 || (H)->forced_local))
2409 /* This macro is to avoid lots of duplicated code in the body
2410 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2411 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2412 r_symndx, symtab_hdr, sym_hashes, \
2413 h, sec, relocation, \
2414 unresolved_reloc, warned, ignored) \
2417 /* It seems this can happen with erroneous or unsupported \
2418 input (mixing a.out and elf in an archive, for example.) */ \
2419 if (sym_hashes == NULL) \
2422 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2424 if (info->wrap_hash != NULL \
2425 && (input_section->flags & SEC_DEBUGGING) != 0) \
2426 h = ((struct elf_link_hash_entry *) \
2427 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2429 while (h->root.type == bfd_link_hash_indirect \
2430 || h->root.type == bfd_link_hash_warning) \
2431 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2435 unresolved_reloc = FALSE; \
2437 if (h->root.type == bfd_link_hash_defined \
2438 || h->root.type == bfd_link_hash_defweak) \
2440 sec = h->root.u.def.section; \
2442 || sec->output_section == NULL) \
2443 /* Set a flag that will be cleared later if we find a \
2444 relocation value for this symbol. output_section \
2445 is typically NULL for symbols satisfied by a shared \
2447 unresolved_reloc = TRUE; \
2449 relocation = (h->root.u.def.value \
2450 + sec->output_section->vma \
2451 + sec->output_offset); \
2453 else if (h->root.type == bfd_link_hash_undefweak) \
2455 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2456 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2458 else if (!info->relocatable) \
2461 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2462 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2463 if (!info->callbacks->undefined_symbol (info, \
2464 h->root.root.string, \
2467 rel->r_offset, err)) \
2471 (void) unresolved_reloc; \
2477 /* This macro is to avoid lots of duplicated code in the body of the
2478 loop over relocations in xxx_relocate_section() in the various
2481 Handle relocations against symbols from removed linkonce sections,
2482 or sections discarded by a linker script. When doing a relocatable
2483 link, we remove such relocations. Otherwise, we just want the
2484 section contents zeroed and avoid any special processing. */
2485 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2486 rel, count, relend, \
2487 howto, index, contents) \
2490 _bfd_clear_contents (howto, input_bfd, input_section, \
2491 contents + rel[index].r_offset); \
2493 if (info->relocatable \
2494 && (input_section->flags & SEC_DEBUGGING)) \
2496 /* Only remove relocations in debug sections since other \
2497 sections may require relocations. */ \
2498 Elf_Internal_Shdr *rel_hdr; \
2500 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2502 /* Avoid empty output section. */ \
2503 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2505 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2506 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2507 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2509 memmove (rel, rel + count, \
2510 (relend - rel - count) * sizeof (*rel)); \
2512 input_section->reloc_count--; \
2519 for (i_ = 0; i_ < count; i_++) \
2521 rel[i_].r_info = 0; \
2522 rel[i_].r_addend = 0; \
2528 /* Will a symbol be bound to the definition within the shared
2529 library, if any. A unique symbol can never be bound locally. */
2530 #define SYMBOLIC_BIND(INFO, H) \
2531 (!(H)->unique_global \
2532 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2534 #endif /* _LIBELF_H_ */