1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2019 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"
34 /* The number of entries in a section is its size divided by the size
35 of a single entry. This is normally only applicable to reloc and
36 symbol table sections.
37 PR 9934: It is possible to have relocations that do not refer to
38 symbols, thus it is also possible to have a relocation section in
39 an object file, but no symbol table. */
40 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
42 /* If size isn't specified as 64 or 32, NAME macro should fail. */
45 #define NAME(x, y) x ## 64 ## _ ## y
48 #define NAME(x, y) x ## 32 ## _ ## y
53 #define NAME(x, y) x ## NOSIZE ## _ ## y
56 #define ElfNAME(X) NAME(Elf,X)
57 #define elfNAME(X) NAME(elf,X)
59 /* Information held for an ELF symbol. The first field is the
60 corresponding asymbol. Every symbol is an ELF file is actually a
61 pointer to this structure, although it is often handled as a
62 pointer to an asymbol. */
68 /* ELF symbol information. */
69 Elf_Internal_Sym internal_elf_sym;
70 /* Backend specific information. */
73 unsigned int hppa_arg_reloc;
79 /* Version information. This is from an Elf_Internal_Versym
80 structure in a SHT_GNU_versym section. It is zero if there is no
81 version information. */
82 unsigned short version;
86 struct elf_strtab_hash;
92 bfd_signed_vma refcount;
94 struct got_entry *glist;
95 struct plt_entry *plist;
98 struct elf_link_virtual_table_entry
100 /* Virtual table entry use information. This array is nominally of size
101 size/sizeof(target_void_pointer), though we have to be able to assume
102 and track a size while the symbol is still undefined. It is indexed
103 via offset/sizeof(target_void_pointer). */
107 /* Virtual table derivation info. */
108 struct elf_link_hash_entry *parent;
111 /* ELF symbol version. */
112 enum elf_symbol_version
120 /* ELF linker hash table entries. */
122 struct elf_link_hash_entry
124 struct bfd_link_hash_entry root;
126 /* Symbol index in output file. This is initialized to -1. It is
127 set to -2 if the symbol is used by a reloc. It is set to -3 if
128 this symbol is defined in a discarded section. */
131 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
132 -1 if this is not a dynamic symbol. */
133 /* ??? Note that this is consistently used as a synonym for tests
134 against whether we can perform various simplifying transformations
135 to the code. (E.g. changing a pc-relative jump to a PLT entry
136 into a pc-relative jump to the target function.) That test, which
137 is often relatively complex, and someplaces wrong or incomplete,
138 should really be replaced by a predicate in elflink.c.
140 End result: this field -1 does not indicate that the symbol is
141 not in the dynamic symbol table, but rather that the symbol is
142 not visible outside this DSO. */
145 /* If this symbol requires an entry in the global offset table, the
146 processor specific backend uses this field to track usage and
147 final offset. Two schemes are supported: The first assumes that
148 a symbol may only have one GOT entry, and uses REFCOUNT until
149 size_dynamic_sections, at which point the contents of the .got is
150 fixed. Afterward, if OFFSET is -1, then the symbol does not
151 require a global offset table entry. The second scheme allows
152 multiple GOT entries per symbol, managed via a linked list
153 pointed to by GLIST. */
154 union gotplt_union got;
156 /* Same, but tracks a procedure linkage table entry. */
157 union gotplt_union plt;
162 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
163 unsigned int type : 8;
165 /* Symbol st_other value, symbol visibility. */
166 unsigned int other : 8;
168 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
169 unsigned int target_internal : 8;
171 /* Symbol is referenced by a non-shared object (other than the object
172 in which it is defined). */
173 unsigned int ref_regular : 1;
174 /* Symbol is defined by a non-shared object. */
175 unsigned int def_regular : 1;
176 /* Symbol is referenced by a shared object. */
177 unsigned int ref_dynamic : 1;
178 /* Symbol is defined by a shared object. */
179 unsigned int def_dynamic : 1;
180 /* Symbol has a non-weak reference from a non-shared object (other than
181 the object in which it is defined). */
182 unsigned int ref_regular_nonweak : 1;
183 /* Dynamic symbol has been adjustd. */
184 unsigned int dynamic_adjusted : 1;
185 /* Symbol needs a copy reloc. */
186 unsigned int needs_copy : 1;
187 /* Symbol needs a procedure linkage table entry. */
188 unsigned int needs_plt : 1;
189 /* Symbol appears in a non-ELF input file. */
190 unsigned int non_elf : 1;
191 /* Symbol version information. */
192 ENUM_BITFIELD (elf_symbol_version) versioned : 2;
193 /* Symbol was forced to local scope due to a version script file. */
194 unsigned int forced_local : 1;
195 /* Symbol was forced to be dynamic due to a version script file. */
196 unsigned int dynamic : 1;
197 /* Symbol was marked during garbage collection. */
198 unsigned int mark : 1;
199 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
200 not currently set by all the backends. */
201 unsigned int non_got_ref : 1;
202 /* Symbol has a definition in a shared object.
203 FIXME: There is no real need for this field if def_dynamic is never
204 cleared and all places that test def_dynamic also test def_regular. */
205 unsigned int dynamic_def : 1;
206 /* Symbol has a non-weak reference from a shared object. */
207 unsigned int ref_dynamic_nonweak : 1;
208 /* Symbol is referenced with a relocation where C/C++ pointer equality
210 unsigned int pointer_equality_needed : 1;
211 /* Symbol is a unique global symbol. */
212 unsigned int unique_global : 1;
213 /* Symbol is defined by a shared library with non-default visibility
214 in a read/write section. */
215 unsigned int protected_def : 1;
216 /* Symbol is __start_SECNAME or __stop_SECNAME to mark section
218 unsigned int start_stop : 1;
219 /* Symbol is or was a weak defined symbol from a dynamic object with
220 a strong defined symbol alias. U.ALIAS points to a list of aliases,
221 the definition having is_weakalias clear. */
222 unsigned int is_weakalias : 1;
224 /* String table index in .dynstr if this is a dynamic symbol. */
225 unsigned long dynstr_index;
229 /* Points to a circular list of non-function symbol aliases. */
230 struct elf_link_hash_entry *alias;
232 /* Hash value of the name computed using the ELF hash function.
233 Used part way through size_dynamic_sections, after we've finished
235 unsigned long elf_hash_value;
238 /* Version information. */
241 /* This field is used for a symbol which is not defined in a
242 regular object. It points to the version information read in
243 from the dynamic object. */
244 Elf_Internal_Verdef *verdef;
245 /* This field is used for a symbol which is defined in a regular
246 object. It is set up in size_dynamic_sections. It points to
247 the version information we should write out for this symbol. */
248 struct bfd_elf_version_tree *vertree;
253 /* For __start_SECNAME and __stop_SECNAME symbols, record the first
254 input section whose section name is SECNAME. */
255 asection *start_stop_section;
257 /* Vtable information. */
258 struct elf_link_virtual_table_entry *vtable;
262 /* Return the strong definition for a weak symbol with aliases. */
264 static inline struct elf_link_hash_entry *
265 weakdef (struct elf_link_hash_entry *h)
267 while (h->is_weakalias)
272 /* Will references to this symbol always reference the symbol
274 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
275 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
277 /* Will _calls_ to this symbol always call the version in this object? */
278 #define SYMBOL_CALLS_LOCAL(INFO, H) \
279 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
281 /* Whether an undefined weak symbol should resolve to its link-time
282 value, even in PIC or PIE objects. */
283 #define UNDEFWEAK_NO_DYNAMIC_RELOC(INFO, H) \
284 ((H)->root.type == bfd_link_hash_undefweak \
285 && (ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT \
286 || (INFO)->dynamic_undefined_weak == 0))
288 /* Common symbols that are turned into definitions don't have the
289 DEF_REGULAR flag set, so they might appear to be undefined.
290 Symbols defined in linker scripts also don't have DEF_REGULAR set. */
291 #define ELF_COMMON_DEF_P(H) \
293 && !(H)->def_dynamic \
294 && (H)->root.type == bfd_link_hash_defined)
296 /* Records local symbols to be emitted in the dynamic symbol table. */
298 struct elf_link_local_dynamic_entry
300 struct elf_link_local_dynamic_entry *next;
302 /* The input bfd this symbol came from. */
305 /* The index of the local symbol being copied. */
308 /* The index in the outgoing dynamic symbol table. */
311 /* A copy of the input symbol. */
312 Elf_Internal_Sym isym;
315 struct elf_link_loaded_list
317 struct elf_link_loaded_list *next;
321 /* Structures used by the eh_frame optimization code. */
326 /* If REMOVED == 1, this is the CIE that the FDE originally used.
327 The CIE belongs to the same .eh_frame input section as the FDE.
329 If REMOVED == 0, this is the CIE that we have chosen to use for
330 the output FDE. The CIE's REMOVED field is also 0, but the CIE
331 might belong to a different .eh_frame input section from the FDE.
333 May be NULL to signify that the FDE should be discarded. */
334 struct eh_cie_fde *cie_inf;
335 struct eh_cie_fde *next_for_section;
338 /* CIEs have three states:
340 - REMOVED && !MERGED: Slated for removal because we haven't yet
341 proven that an FDE needs it. FULL_CIE, if nonnull, points to
342 more detailed information about the CIE.
344 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
345 which may not belong to the same input section.
347 - !REMOVED: We have decided to keep this CIE. SEC is the
348 .eh_frame input section that contains the CIE. */
350 struct cie *full_cie;
351 struct eh_cie_fde *merged_with;
355 /* The offset of the personality data from the start of the CIE,
356 or 0 if the CIE doesn't have any. */
357 unsigned int personality_offset : 8;
359 /* Length of augmentation. aug_str_len is the length of the
360 string including null terminator. aug_data_len is the length
361 of the rest up to the initial insns. */
362 unsigned int aug_str_len : 3;
363 unsigned int aug_data_len : 5;
365 /* True if we have marked relocations associated with this CIE. */
366 unsigned int gc_mark : 1;
368 /* True if we have decided to turn an absolute LSDA encoding into
369 a PC-relative one. */
370 unsigned int make_lsda_relative : 1;
372 /* True if we have decided to turn an absolute personality
373 encoding into a PC-relative one. */
374 unsigned int make_per_encoding_relative : 1;
376 /* True if the CIE contains personality data and if that
377 data uses a PC-relative encoding. Always true when
378 make_per_encoding_relative is. */
379 unsigned int per_encoding_relative : 1;
381 /* True if the CIE contains personality data aligned to a
382 multiple of eight bytes. */
383 unsigned int per_encoding_aligned8 : 1;
385 /* True if we need to add an 'R' (FDE encoding) entry to the
386 CIE's augmentation data. */
387 unsigned int add_fde_encoding : 1;
389 /* True if we have merged this CIE with another. */
390 unsigned int merged : 1;
393 unsigned int pad1 : 9;
396 unsigned int reloc_index;
399 unsigned int new_offset;
400 unsigned int fde_encoding : 8;
401 unsigned int lsda_encoding : 8;
402 unsigned int lsda_offset : 8;
404 /* True if this entry represents a CIE, false if it represents an FDE. */
405 unsigned int cie : 1;
407 /* True if this entry is currently marked for removal. */
408 unsigned int removed : 1;
410 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
411 augmentation data, and an associated byte to each of the CIE's FDEs. */
412 unsigned int add_augmentation_size : 1;
414 /* True if we have decided to convert absolute FDE relocations into
415 relative ones. This applies to the first relocation in the FDE,
416 which is against the code that the FDE describes. */
417 unsigned int make_relative : 1;
420 unsigned int pad1 : 4;
422 unsigned int *set_loc;
425 struct eh_frame_sec_info
429 struct eh_cie_fde entry[1];
432 struct eh_frame_array_ent
441 #define DWARF2_EH_HDR 1
442 #define COMPACT_EH_HDR 2
444 /* Endian-neutral code indicating that a function cannot be unwound. */
445 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
447 struct dwarf_eh_frame_hdr_info
450 unsigned int fde_count;
451 /* TRUE if .eh_frame_hdr should contain the sorted search table.
452 We build it if we successfully read all .eh_frame input sections
453 and recognize them. */
455 struct eh_frame_array_ent *array;
458 struct compact_eh_frame_hdr_info
460 unsigned int allocated_entries;
461 /* eh_frame_entry fragments. */
465 struct eh_frame_hdr_info
468 unsigned int array_count;
469 bfd_boolean frame_hdr_is_compact;
472 struct dwarf_eh_frame_hdr_info dwarf;
473 struct compact_eh_frame_hdr_info compact;
478 /* Enum used to identify target specific extensions to the elf_obj_tdata
479 and elf_link_hash_table structures. Note the enums deliberately start
480 from 1 so that we can detect an uninitialized field. The generic value
481 is last so that additions to this enum do not need to modify more than
485 AARCH64_ELF_DATA = 1,
525 struct elf_sym_strtab
527 Elf_Internal_Sym sym;
528 unsigned long dest_index;
529 unsigned long destshndx_index;
532 /* ELF linker hash table. */
534 struct elf_link_hash_table
536 struct bfd_link_hash_table root;
538 /* An identifier used to distinguish different target
539 specific extensions to this structure. */
540 enum elf_target_id hash_table_id;
542 /* Whether we have created the special dynamic sections required
543 when linking against or generating a shared object. */
544 bfd_boolean dynamic_sections_created;
546 /* Whether dynamic relocations are present. */
547 bfd_boolean dynamic_relocs;
549 /* True if this target has relocatable executables, so needs dynamic
551 bfd_boolean is_relocatable_executable;
553 /* The BFD used to hold special sections created by the linker.
554 This will be the first BFD found which requires these sections to
558 /* The value to use when initialising got.refcount/offset and
559 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
560 the values are refcounts. Set to init_got_offset/init_plt_offset
561 in size_dynamic_sections when the values may be offsets. */
562 union gotplt_union init_got_refcount;
563 union gotplt_union init_plt_refcount;
565 /* The value to use for got.refcount/offset and plt.refcount/offset
566 when the values may be offsets. Normally (bfd_vma) -1. */
567 union gotplt_union init_got_offset;
568 union gotplt_union init_plt_offset;
570 /* The number of symbols found in the link which is intended for the
571 mandatory DT_SYMTAB tag (.dynsym section) in .dynamic section. */
572 bfd_size_type dynsymcount;
573 bfd_size_type local_dynsymcount;
575 /* The string table of dynamic symbols, which becomes the .dynstr
577 struct elf_strtab_hash *dynstr;
579 /* The number of symbol strings found in the link which must be put
580 into the .strtab section. */
581 bfd_size_type strtabcount;
583 /* The array size of the symbol string table, which becomes the
585 bfd_size_type strtabsize;
587 /* The array of strings, which becomes the .strtab section. */
588 struct elf_sym_strtab *strtab;
590 /* The number of buckets in the hash table in the .hash section.
591 This is based on the number of dynamic symbols. */
592 bfd_size_type bucketcount;
594 /* A linked list of DT_NEEDED names found in dynamic objects
595 included in the link. */
596 struct bfd_link_needed_list *needed;
598 /* Sections in the output bfd that provides a section symbol
599 to be used by relocations emitted against local symbols.
600 Most targets will not use data_index_section. */
601 asection *text_index_section;
602 asection *data_index_section;
604 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
605 struct elf_link_hash_entry *hgot;
607 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
608 struct elf_link_hash_entry *hplt;
610 /* The _DYNAMIC symbol. */
611 struct elf_link_hash_entry *hdynamic;
613 /* A pointer to information used to merge SEC_MERGE sections. */
616 /* Used to link stabs in sections. */
617 struct stab_info stab_info;
619 /* Used by eh_frame code when editing .eh_frame. */
620 struct eh_frame_hdr_info eh_info;
622 /* A linked list of local symbols to be added to .dynsym. */
623 struct elf_link_local_dynamic_entry *dynlocal;
625 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
626 objects included in the link. */
627 struct bfd_link_needed_list *runpath;
629 /* Cached first output tls section and size of PT_TLS segment. */
631 bfd_size_type tls_size;
633 /* A linked list of BFD's loaded in the link. */
634 struct elf_link_loaded_list *loaded;
636 /* Short-cuts to get to dynamic linker sections. */
645 asection *sreldynrelro;
653 /* Look up an entry in an ELF linker hash table. */
655 #define elf_link_hash_lookup(table, string, create, copy, follow) \
656 ((struct elf_link_hash_entry *) \
657 bfd_link_hash_lookup (&(table)->root, (string), (create), \
660 /* Traverse an ELF linker hash table. */
662 #define elf_link_hash_traverse(table, func, info) \
663 (bfd_link_hash_traverse \
665 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
668 /* Get the ELF linker hash table from a link_info structure. */
670 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
672 #define elf_hash_table_id(table) ((table) -> hash_table_id)
674 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
675 #define is_elf_hash_table(htab) \
676 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
678 /* Used by bfd_sym_from_r_symndx to cache a small number of local
680 #define LOCAL_SYM_CACHE_SIZE 32
684 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
685 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
688 /* Constant information held for an ELF backend. */
690 struct elf_size_info {
691 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
692 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
694 /* The size of entries in the .hash section. */
695 unsigned char sizeof_hash_entry;
697 /* The number of internal relocations to allocate per external
699 unsigned char int_rels_per_ext_rel;
700 /* We use some fixed size arrays. This should be large enough to
701 handle all back-ends. */
702 #define MAX_INT_RELS_PER_EXT_REL 3
704 unsigned char arch_size, log_file_align;
705 unsigned char elfclass, ev_current;
706 int (*write_out_phdrs)
707 (bfd *, const Elf_Internal_Phdr *, unsigned int);
709 (*write_shdrs_and_ehdr) (bfd *);
710 bfd_boolean (*checksum_contents)
711 (bfd * , void (*) (const void *, size_t, void *), void *);
713 (bfd *, asection *, void *);
714 bfd_boolean (*swap_symbol_in)
715 (bfd *, const void *, const void *, Elf_Internal_Sym *);
716 void (*swap_symbol_out)
717 (bfd *, const Elf_Internal_Sym *, void *, void *);
718 bfd_boolean (*slurp_reloc_table)
719 (bfd *, asection *, asymbol **, bfd_boolean);
720 long (*slurp_symbol_table)
721 (bfd *, asymbol **, bfd_boolean);
723 (bfd *, const void *, Elf_Internal_Dyn *);
725 (bfd *, const Elf_Internal_Dyn *, void *);
727 /* This function is called to swap in a REL relocation. If an
728 external relocation corresponds to more than one internal
729 relocation, then all relocations are swapped in at once. */
730 void (*swap_reloc_in)
731 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
733 /* This function is called to swap out a REL relocation. */
734 void (*swap_reloc_out)
735 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
737 /* This function is called to swap in a RELA relocation. If an
738 external relocation corresponds to more than one internal
739 relocation, then all relocations are swapped in at once. */
740 void (*swap_reloca_in)
741 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
743 /* This function is called to swap out a RELA relocation. */
744 void (*swap_reloca_out)
745 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
748 #define elf_symbol_from(ABFD,S) \
749 (((S)->the_bfd != NULL \
750 && (S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
751 && (S)->the_bfd->tdata.elf_obj_data != 0) \
752 ? (elf_symbol_type *) (S) \
755 enum elf_reloc_type_class {
757 reloc_class_relative,
763 struct elf_reloc_cookie
765 Elf_Internal_Rela *rels, *rel, *relend;
766 Elf_Internal_Sym *locsyms;
770 struct elf_link_hash_entry **sym_hashes;
772 bfd_boolean bad_symtab;
775 /* The level of IRIX compatibility we're striving for. */
783 /* Mapping of ELF section names and types. */
784 struct bfd_elf_special_section
787 unsigned int prefix_length;
788 /* 0 means name must match PREFIX exactly.
789 -1 means name must start with PREFIX followed by an arbitrary string.
790 -2 means name must match PREFIX exactly or consist of PREFIX followed
791 by a dot then anything.
792 > 0 means name must start with the first PREFIX_LENGTH chars of
793 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
794 signed int suffix_length;
799 enum action_discarded
805 typedef asection * (*elf_gc_mark_hook_fn)
806 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
807 struct elf_link_hash_entry *, Elf_Internal_Sym *);
809 enum elf_property_kind
811 /* A new property. */
812 property_unknown = 0,
813 /* A property ignored by backend. */
815 /* A corrupt property reported by backend. */
817 /* A property should be removed due to property merge. */
819 /* A property which is a number. */
823 typedef struct elf_property
825 unsigned int pr_type;
826 unsigned int pr_datasz;
829 /* For property_number, this is a number. */
831 /* Add a new one if elf_property_kind is updated. */
833 enum elf_property_kind pr_kind;
834 const char *filename;
837 typedef struct elf_property_list
839 struct elf_property_list *next;
840 struct elf_property property;
843 struct bfd_elf_section_reloc_data;
845 struct elf_backend_data
847 /* The architecture for this backend. */
848 enum bfd_architecture arch;
850 /* An identifier used to distinguish different target specific
851 extensions to elf_obj_tdata and elf_link_hash_table structures. */
852 enum elf_target_id target_id;
854 /* The ELF machine code (EM_xxxx) for this backend. */
855 int elf_machine_code;
860 /* The maximum page size for this backend. */
863 /* The minimum page size for this backend. An input object will not be
864 considered page aligned unless its sections are correctly aligned for
865 pages at least this large. May be smaller than maxpagesize. */
868 /* The common page size for this backend. */
869 bfd_vma commonpagesize;
871 /* The value of commonpagesize to use when -z relro for this backend. */
872 bfd_vma relropagesize;
874 /* The BFD flags applied to sections created for dynamic linking. */
875 flagword dynamic_sec_flags;
877 /* Architecture-specific data for this backend.
878 This is actually a pointer to some type like struct elf_ARCH_data. */
879 const void *arch_data;
881 /* A function to translate an ELF RELA relocation to a BFD arelent
882 structure. Returns TRUE upon success, FALSE otherwise. */
883 bfd_boolean (*elf_info_to_howto)
884 (bfd *, arelent *, Elf_Internal_Rela *);
886 /* A function to translate an ELF REL relocation to a BFD arelent
887 structure. Returns TRUE upon success, FALSE otherwise. */
888 bfd_boolean (*elf_info_to_howto_rel)
889 (bfd *, arelent *, Elf_Internal_Rela *);
891 /* A function to determine whether a symbol is global when
892 partitioning the symbol table into local and global symbols.
893 This should be NULL for most targets, in which case the correct
894 thing will be done. MIPS ELF, at least on the Irix 5, has
895 special requirements. */
896 bfd_boolean (*elf_backend_sym_is_global)
899 /* The remaining functions are hooks which are called only if they
902 /* A function to permit a backend specific check on whether a
903 particular BFD format is relevant for an object file, and to
904 permit the backend to set any global information it wishes. When
905 this is called elf_elfheader is set, but anything else should be
906 used with caution. If this returns FALSE, the check_format
907 routine will return a bfd_error_wrong_format error. */
908 bfd_boolean (*elf_backend_object_p)
911 /* A function to do additional symbol processing when reading the
912 ELF symbol table. This is where any processor-specific special
913 section indices are handled. */
914 void (*elf_backend_symbol_processing)
917 /* A function to do additional symbol processing after reading the
918 entire ELF symbol table. */
919 bfd_boolean (*elf_backend_symbol_table_processing)
920 (bfd *, elf_symbol_type *, unsigned int);
922 /* A function to set the type of the info field. Processor-specific
923 types should be handled here. */
924 int (*elf_backend_get_symbol_type)
925 (Elf_Internal_Sym *, int);
927 /* A function to return the linker hash table entry of a symbol that
928 might be satisfied by an archive symbol. */
929 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
930 (bfd *, struct bfd_link_info *, const char *);
932 /* Return true if local section symbols should have a non-null st_name.
933 NULL implies false. */
934 bfd_boolean (*elf_backend_name_local_section_symbols)
937 /* A function to do additional processing on the ELF section header
938 just before writing it out. This is used to set the flags and
939 type fields for some sections, or to actually write out data for
941 bfd_boolean (*elf_backend_section_processing)
942 (bfd *, Elf_Internal_Shdr *);
944 /* A function to handle unusual section types when creating BFD
945 sections from ELF sections. */
946 bfd_boolean (*elf_backend_section_from_shdr)
947 (bfd *, Elf_Internal_Shdr *, const char *, int);
949 /* A function to convert machine dependent ELF section header flags to
950 BFD internal section header flags. */
951 bfd_boolean (*elf_backend_section_flags)
952 (flagword *, const Elf_Internal_Shdr *);
954 /* A function that returns a struct containing ELF section flags and
955 type for the given BFD section. */
956 const struct bfd_elf_special_section * (*get_sec_type_attr)
959 /* A function to handle unusual program segment types when creating BFD
960 sections from ELF program segments. */
961 bfd_boolean (*elf_backend_section_from_phdr)
962 (bfd *, Elf_Internal_Phdr *, int, const char *);
964 /* A function to set up the ELF section header for a BFD section in
965 preparation for writing it out. This is where the flags and type
966 fields are set for unusual sections. */
967 bfd_boolean (*elf_backend_fake_sections)
968 (bfd *, Elf_Internal_Shdr *, asection *);
970 /* A function to get the ELF section index for a BFD section. If
971 this returns TRUE, the section was found. If it is a normal ELF
972 section, *RETVAL should be left unchanged. If it is not a normal
973 ELF section *RETVAL should be set to the SHN_xxxx index. */
974 bfd_boolean (*elf_backend_section_from_bfd_section)
975 (bfd *, asection *, int *retval);
977 /* If this field is not NULL, it is called by the add_symbols phase
978 of a link just before adding a symbol to the global linker hash
979 table. It may modify any of the fields as it wishes. If *NAME
980 is set to NULL, the symbol will be skipped rather than being
981 added to the hash table. This function is responsible for
982 handling all processor dependent symbol bindings and section
983 indices, and must set at least *FLAGS and *SEC for each processor
984 dependent case; failure to do so will cause a link error. */
985 bfd_boolean (*elf_add_symbol_hook)
986 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
987 const char **name, flagword *flags, asection **sec, bfd_vma *value);
989 /* If this field is not NULL, it is called by the elf_link_output_sym
990 phase of a link for each symbol which will appear in the object file.
991 On error, this function returns 0. 1 is returned when the symbol
992 should be output, 2 is returned when the symbol should be discarded. */
993 int (*elf_backend_link_output_symbol_hook)
994 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
995 asection *, struct elf_link_hash_entry *);
997 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
998 linker the first time it encounters a dynamic object in the link.
999 This function must create any sections required for dynamic
1000 linking. The ABFD argument is a dynamic object. The .interp,
1001 .dynamic, .dynsym, .dynstr, and .hash functions have already been
1002 created, and this function may modify the section flags if
1003 desired. This function will normally create the .got and .plt
1004 sections, but different backends have different requirements. */
1005 bfd_boolean (*elf_backend_create_dynamic_sections)
1006 (bfd *abfd, struct bfd_link_info *info);
1008 /* When creating a shared library, determine whether to omit the
1009 dynamic symbol for the section. */
1010 bfd_boolean (*elf_backend_omit_section_dynsym)
1011 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
1013 /* Return TRUE if relocations of targets are compatible to the extent
1014 that CHECK_RELOCS will properly process them. PR 4424. */
1015 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
1017 /* The CHECK_RELOCS function is called by the add_symbols phase of
1018 the ELF backend linker. It is called once for each section with
1019 relocs of an object file, just after the symbols for the object
1020 file have been added to the global linker hash table. The
1021 function must look through the relocs and do any special handling
1022 required. This generally means allocating space in the global
1023 offset table, and perhaps allocating space for a reloc. The
1024 relocs are always passed as Rela structures; if the section
1025 actually uses Rel structures, the r_addend field will always be
1027 bfd_boolean (*check_relocs)
1028 (bfd *abfd, struct bfd_link_info *info, asection *o,
1029 const Elf_Internal_Rela *relocs);
1031 /* The CHECK_DIRECTIVES function is called once per input file by
1032 the add_symbols phase of the ELF backend linker. The function
1033 must inspect the bfd and create any additional symbols according
1034 to any custom directives in the bfd. */
1035 bfd_boolean (*check_directives)
1036 (bfd *abfd, struct bfd_link_info *info);
1038 /* The NOTICE_AS_NEEDED function is called as the linker is about to
1039 handle an as-needed lib (ACT = notice_as_needed), and after the
1040 linker has decided to keep the lib (ACT = notice_needed) or when
1041 the lib is not needed (ACT = notice_not_needed). */
1042 bfd_boolean (*notice_as_needed)
1043 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
1045 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
1046 linker for every symbol which is defined by a dynamic object and
1047 referenced by a regular object. This is called after all the
1048 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
1049 function has been called. The hash table entry should be
1050 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
1051 defined in a section from a dynamic object. Dynamic object
1052 sections are not included in the final link, and this function is
1053 responsible for changing the value to something which the rest of
1054 the link can deal with. This will normally involve adding an
1055 entry to the .plt or .got or some such section, and setting the
1056 symbol to point to that. */
1057 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
1058 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
1060 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
1061 after all the linker input files have been seen but before the
1062 section sizes have been set. This is called after
1063 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
1064 bfd_boolean (*elf_backend_always_size_sections)
1065 (bfd *output_bfd, struct bfd_link_info *info);
1067 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
1068 linker after all the linker input files have been seen but before
1069 the sections sizes have been set. This is called after
1070 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
1071 It is only called when linking against a dynamic object. It must
1072 set the sizes of the dynamic sections, and may fill in their
1073 contents as well. The generic ELF linker can handle the .dynsym,
1074 .dynstr and .hash sections. This function must handle the
1075 .interp section and any sections created by the
1076 CREATE_DYNAMIC_SECTIONS entry point. */
1077 bfd_boolean (*elf_backend_size_dynamic_sections)
1078 (bfd *output_bfd, struct bfd_link_info *info);
1080 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
1081 we keep to use as a base for relocs and symbols. */
1082 void (*elf_backend_init_index_section)
1083 (bfd *output_bfd, struct bfd_link_info *info);
1085 /* The RELOCATE_SECTION function is called by the ELF backend linker
1086 to handle the relocations for a section.
1088 The relocs are always passed as Rela structures; if the section
1089 actually uses Rel structures, the r_addend field will always be
1092 This function is responsible for adjust the section contents as
1093 necessary, and (if using Rela relocs and generating a
1094 relocatable output file) adjusting the reloc addend as
1097 This function does not have to worry about setting the reloc
1098 address or the reloc symbol index.
1100 LOCAL_SYMS is a pointer to the swapped in local symbols.
1102 LOCAL_SECTIONS is an array giving the section in the input file
1103 corresponding to the st_shndx field of each local symbol.
1105 The global hash table entry for the global symbols can be found
1106 via elf_sym_hashes (input_bfd).
1108 When generating relocatable output, this function must handle
1109 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1110 going to be the section symbol corresponding to the output
1111 section, which means that the addend must be adjusted
1114 Returns FALSE on error, TRUE on success, 2 if successful and
1115 relocations should be written for this section. */
1116 int (*elf_backend_relocate_section)
1117 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
1118 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
1119 Elf_Internal_Sym *local_syms, asection **local_sections);
1121 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1122 linker just before it writes a symbol out to the .dynsym section.
1123 The processor backend may make any required adjustment to the
1124 symbol. It may also take the opportunity to set contents of the
1125 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1126 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1127 on those symbols which are defined by a dynamic object. */
1128 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1129 (bfd *output_bfd, struct bfd_link_info *info,
1130 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1132 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1133 linker just before it writes all the dynamic sections out to the
1134 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1135 all dynamic symbols. */
1136 bfd_boolean (*elf_backend_finish_dynamic_sections)
1137 (bfd *output_bfd, struct bfd_link_info *info);
1139 /* A function to do any beginning processing needed for the ELF file
1140 before building the ELF headers and computing file positions. */
1141 void (*elf_backend_begin_write_processing)
1142 (bfd *, struct bfd_link_info *);
1144 /* A function to do any final processing needed for the ELF file
1145 before writing it out. */
1146 bfd_boolean (*elf_backend_final_write_processing)
1149 /* This function is called by get_program_header_size. It should
1150 return the number of additional program segments which this BFD
1151 will need. It should return -1 on error. */
1152 int (*elf_backend_additional_program_headers)
1153 (bfd *, struct bfd_link_info *);
1155 /* This function is called to modify an existing segment map in a
1156 backend specific fashion. */
1157 bfd_boolean (*elf_backend_modify_segment_map)
1158 (bfd *, struct bfd_link_info *);
1160 /* This function is called to modify program headers just before
1161 they are written. */
1162 bfd_boolean (*elf_backend_modify_program_headers)
1163 (bfd *, struct bfd_link_info *);
1165 /* This function is called to see if the PHDR header should be
1166 checked for validity. */
1167 bfd_boolean (*elf_backend_allow_non_load_phdr)
1168 (bfd *, const Elf_Internal_Phdr *, unsigned);
1170 /* This function is called before section garbage collection to
1171 mark entry symbol sections. */
1173 (struct bfd_link_info *);
1175 /* This function is called during section garbage collection to
1176 mark sections that define global symbols. */
1177 bfd_boolean (*gc_mark_dynamic_ref)
1178 (struct elf_link_hash_entry *, void *);
1180 /* This function is called during section gc to discover the section a
1181 particular relocation refers to. */
1182 elf_gc_mark_hook_fn gc_mark_hook;
1184 /* This function, if defined, is called after the first gc marking pass
1185 to allow the backend to mark additional sections. */
1186 bfd_boolean (*gc_mark_extra_sections)
1187 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1189 /* This function, if defined, is called after the ELF headers have
1190 been created. This allows for things like the OS and ABI versions
1192 void (*elf_backend_post_process_headers)
1193 (bfd *, struct bfd_link_info *);
1195 /* This function, if defined, prints a symbol to file and returns the
1196 name of the symbol to be printed. It should return NULL to fall
1197 back to default symbol printing. */
1198 const char *(*elf_backend_print_symbol_all)
1199 (bfd *, void *, asymbol *);
1201 /* This function, if defined, is called after all local symbols and
1202 global symbols converted to locals are emitted into the symtab
1203 section. It allows the backend to emit special local symbols
1204 not handled in the hash table. */
1205 bfd_boolean (*elf_backend_output_arch_local_syms)
1206 (bfd *, struct bfd_link_info *, void *,
1207 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1208 struct elf_link_hash_entry *));
1210 /* This function, if defined, is called after all symbols are emitted
1211 into the symtab section. It allows the backend to emit special
1212 global symbols not handled in the hash table. */
1213 bfd_boolean (*elf_backend_output_arch_syms)
1214 (bfd *, struct bfd_link_info *, void *,
1215 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1216 struct elf_link_hash_entry *));
1218 /* Filter what symbols of the output file to include in the import
1219 library if one is created. */
1220 unsigned int (*elf_backend_filter_implib_symbols)
1221 (bfd *, struct bfd_link_info *, asymbol **, long);
1223 /* Copy any information related to dynamic linking from a pre-existing
1224 symbol to a newly created symbol. Also called to copy flags and
1225 other back-end info to a weakdef, in which case the symbol is not
1226 newly created and plt/got refcounts and dynamic indices should not
1228 void (*elf_backend_copy_indirect_symbol)
1229 (struct bfd_link_info *, struct elf_link_hash_entry *,
1230 struct elf_link_hash_entry *);
1232 /* Modify any information related to dynamic linking such that the
1233 symbol is not exported. */
1234 void (*elf_backend_hide_symbol)
1235 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1237 /* A function to do additional symbol fixup, called by
1238 _bfd_elf_fix_symbol_flags. */
1239 bfd_boolean (*elf_backend_fixup_symbol)
1240 (struct bfd_link_info *, struct elf_link_hash_entry *);
1242 /* Merge the backend specific symbol attribute. */
1243 void (*elf_backend_merge_symbol_attribute)
1244 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1247 /* This function, if defined, will return a string containing the
1248 name of a target-specific dynamic tag. */
1249 char *(*elf_backend_get_target_dtag)
1252 /* Decide whether an undefined symbol is special and can be ignored.
1253 This is the case for OPTIONAL symbols on IRIX. */
1254 bfd_boolean (*elf_backend_ignore_undef_symbol)
1255 (struct elf_link_hash_entry *);
1257 /* Emit relocations. Overrides default routine for emitting relocs,
1258 except during a relocatable link, or if all relocs are being emitted. */
1259 bfd_boolean (*elf_backend_emit_relocs)
1260 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1261 struct elf_link_hash_entry **);
1263 /* Update relocations. It is allowed to change the number and the order.
1264 In such a case hashes should be invalidated. */
1265 void (*elf_backend_update_relocs)
1266 (asection *, struct bfd_elf_section_reloc_data *);
1268 /* Count relocations. Not called for relocatable links
1269 or if all relocs are being preserved in the output. */
1270 unsigned int (*elf_backend_count_relocs)
1271 (struct bfd_link_info *, asection *);
1273 /* Count additionals relocations. Called for relocatable links if
1274 additional relocations needs to be created. */
1275 unsigned int (*elf_backend_count_additional_relocs)
1278 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1279 by r_offset. If NULL, default to true. */
1280 bfd_boolean (*sort_relocs_p)
1283 /* This function, if defined, is called when an NT_PRSTATUS note is found
1285 bfd_boolean (*elf_backend_grok_prstatus)
1286 (bfd *, Elf_Internal_Note *);
1288 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1289 note is found in a core file. */
1290 bfd_boolean (*elf_backend_grok_psinfo)
1291 (bfd *, Elf_Internal_Note *);
1293 /* This function, if defined, is called when a "FreeBSD" NT_PRSTATUS
1294 note is found in a core file. */
1295 bfd_boolean (*elf_backend_grok_freebsd_prstatus)
1296 (bfd *, Elf_Internal_Note *);
1298 /* This function, if defined, is called to write a note to a corefile. */
1299 char *(*elf_backend_write_core_note)
1300 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1302 /* This function, if defined, is called to convert target-specific
1303 section flag names into hex values. */
1304 flagword (*elf_backend_lookup_section_flags_hook)
1307 /* This function returns class of a reloc type. */
1308 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1309 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1311 /* This function, if defined, removes information about discarded functions
1312 from other sections which mention them. */
1313 bfd_boolean (*elf_backend_discard_info)
1314 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1316 /* This function, if defined, signals that the function above has removed
1317 the discarded relocations for this section. */
1318 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1321 /* What to do when ld finds relocations against symbols defined in
1322 discarded sections. */
1323 unsigned int (*action_discarded)
1326 /* This function returns the width of FDE pointers in bytes, or 0 if
1327 that can't be determined for some reason. The default definition
1328 goes by the bfd's EI_CLASS. */
1329 unsigned int (*elf_backend_eh_frame_address_size)
1330 (bfd *, const asection *);
1332 /* These functions tell elf-eh-frame whether to attempt to turn
1333 absolute or lsda encodings into pc-relative ones. The default
1334 definition enables these transformations. */
1335 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1336 (bfd *, struct bfd_link_info *, asection *);
1337 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1338 (bfd *, struct bfd_link_info *, asection *);
1340 /* This function returns an encoding after computing the encoded
1341 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1342 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1343 The default definition chooses a 32-bit PC-relative encoding. */
1344 bfd_byte (*elf_backend_encode_eh_address)
1345 (bfd *abfd, struct bfd_link_info *info,
1346 asection *osec, bfd_vma offset,
1347 asection *loc_sec, bfd_vma loc_offset,
1350 /* This function, if defined, may write out the given section.
1351 Returns TRUE if it did so and FALSE if the caller should. */
1352 bfd_boolean (*elf_backend_write_section)
1353 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1355 /* The level of IRIX compatibility we're striving for.
1356 MIPS ELF specific function. */
1357 irix_compat_t (*elf_backend_mips_irix_compat)
1360 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1361 (bfd *, unsigned int, bfd_boolean);
1363 /* The swapping table to use when dealing with ECOFF information.
1364 Used for the MIPS ELF .mdebug section. */
1365 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1367 /* This function implements `bfd_elf_bfd_from_remote_memory';
1368 see elf.c, elfcode.h. */
1369 bfd *(*elf_backend_bfd_from_remote_memory)
1370 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1371 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1372 bfd_size_type len));
1374 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1376 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1378 /* Is symbol defined in common section? */
1379 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1381 /* Return a common section index for section. */
1382 unsigned int (*common_section_index) (asection *);
1384 /* Return a common section for section. */
1385 asection *(*common_section) (asection *);
1387 /* Return TRUE if we can merge 2 definitions. */
1388 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1389 const Elf_Internal_Sym *, asection **,
1390 bfd_boolean, bfd_boolean,
1391 bfd *, const asection *);
1393 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1394 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1396 /* If non-NULL, called to register the location of XLAT_LOC within
1397 .MIPS.xhash at which real final dynindx for H will be written.
1398 If XLAT_LOC is zero, the symbol is not included in
1399 .MIPS.xhash and no dynindx will be written. */
1400 void (*record_xhash_symbol)
1401 (struct elf_link_hash_entry *h, bfd_vma xlat_loc);
1403 /* Return TRUE if type is a function symbol type. */
1404 bfd_boolean (*is_function_type) (unsigned int type);
1406 /* If the ELF symbol SYM might be a function in SEC, return the
1407 function size and set *CODE_OFF to the function's entry point,
1408 otherwise return zero. */
1409 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1412 /* Given NAME, the name of a relocation section stripped of its
1413 .rel/.rela prefix, return the section in ABFD to which the
1414 relocations apply. */
1415 asection *(*get_reloc_section) (bfd *abfd, const char *name);
1417 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
1418 has a type >= SHT_LOOS. Returns TRUE if the fields were initialised,
1419 FALSE otherwise. Can be called multiple times for a given section,
1420 until it returns TRUE. Most of the times it is called ISECTION will be
1421 set to an input section that might be associated with the output section.
1422 The last time that it is called, ISECTION will be set to NULL. */
1423 bfd_boolean (*elf_backend_copy_special_section_fields)
1424 (const bfd *ibfd, bfd *obfd, const Elf_Internal_Shdr *isection,
1425 Elf_Internal_Shdr *osection);
1427 /* Used to handle bad SHF_LINK_ORDER input. */
1428 void (*link_order_error_handler) (const char *, ...);
1430 /* Name of the PLT relocation section. */
1431 const char *relplt_name;
1433 /* Alternate EM_xxxx machine codes for this backend. */
1434 int elf_machine_alt1;
1435 int elf_machine_alt2;
1437 const struct elf_size_info *s;
1439 /* An array of target specific special sections. */
1440 const struct bfd_elf_special_section *special_sections;
1442 /* The size in bytes of the header for the GOT. This includes the
1443 so-called reserved entries on some systems. */
1444 bfd_vma got_header_size;
1446 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1447 otherwise by the local symbol with index SYMNDX in IBFD. */
1448 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1449 struct elf_link_hash_entry *h,
1450 bfd *ibfd, unsigned long symndx);
1452 /* The vendor name to use for a processor-standard attributes section. */
1453 const char *obj_attrs_vendor;
1455 /* The section name to use for a processor-standard attributes section. */
1456 const char *obj_attrs_section;
1458 /* Return 1, 2 or 3 to indicate what type of arguments a
1459 processor-specific tag takes. */
1460 int (*obj_attrs_arg_type) (int);
1462 /* The section type to use for an attributes section. */
1463 unsigned int obj_attrs_section_type;
1465 /* This function determines the order in which any attributes are
1466 written. It must be defined for input in the range
1467 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1468 is used in order to make unity easy). The returned value is the
1469 actual tag number to place in the input position. */
1470 int (*obj_attrs_order) (int);
1472 /* Handle merging unknown attributes; either warn and return TRUE,
1473 or give an error and return FALSE. */
1474 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1476 /* Parse GNU properties. Return the property kind. If the property
1477 is corrupt, issue an error message and return property_corrupt. */
1478 enum elf_property_kind (*parse_gnu_properties) (bfd *, unsigned int,
1482 /* Merge GNU properties. Return TRUE if property is updated. */
1483 bfd_boolean (*merge_gnu_properties) (struct bfd_link_info *, bfd *, bfd *,
1484 elf_property *, elf_property *);
1486 /* Set up GNU properties. */
1487 bfd *(*setup_gnu_properties) (struct bfd_link_info *);
1489 /* Fix up GNU properties. */
1490 void (*fixup_gnu_properties) (struct bfd_link_info *,
1491 elf_property_list **);
1493 /* Encoding used for compact EH tables. */
1494 int (*compact_eh_encoding) (struct bfd_link_info *);
1496 /* Opcode representing no unwind. */
1497 int (*cant_unwind_opcode) (struct bfd_link_info *);
1499 /* This is non-zero if static TLS segments require a special alignment. */
1500 unsigned static_tls_alignment;
1502 /* Alignment for the PT_GNU_STACK segment. */
1503 unsigned stack_align;
1505 /* Flag bits to assign to a section of type SHT_STRTAB. */
1506 unsigned long elf_strtab_flags;
1508 /* This is TRUE if the linker should act like collect and gather
1509 global constructors and destructors by name. This is TRUE for
1510 MIPS ELF because the Irix 5 tools can not handle the .init
1512 unsigned collect : 1;
1514 /* This is TRUE if the linker should ignore changes to the type of a
1515 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1516 record undefined functions as STT_OBJECT although the definitions
1518 unsigned type_change_ok : 1;
1520 /* Whether the backend may use REL relocations. (Some backends use
1521 both REL and RELA relocations, and this flag is set for those
1523 unsigned may_use_rel_p : 1;
1525 /* Whether the backend may use RELA relocations. (Some backends use
1526 both REL and RELA relocations, and this flag is set for those
1528 unsigned may_use_rela_p : 1;
1530 /* Whether the default relocation type is RELA. If a backend with
1531 this flag set wants REL relocations for a particular section,
1532 it must note that explicitly. Similarly, if this flag is clear,
1533 and the backend wants RELA relocations for a particular
1535 unsigned default_use_rela_p : 1;
1537 /* True if PLT and copy relocations should be RELA by default. */
1538 unsigned rela_plts_and_copies_p : 1;
1540 /* Set if RELA relocations for a relocatable link can be handled by
1541 generic code. Backends that set this flag need do nothing in the
1542 backend relocate_section routine for relocatable linking. */
1543 unsigned rela_normal : 1;
1545 /* Set if DT_REL/DT_RELA/DT_RELSZ/DT_RELASZ should not include PLT
1547 unsigned dtrel_excludes_plt : 1;
1549 /* TRUE if addresses "naturally" sign extend. This is used when
1550 swapping in from Elf32 when BFD64. */
1551 unsigned sign_extend_vma : 1;
1553 unsigned want_got_plt : 1;
1554 unsigned plt_readonly : 1;
1555 unsigned want_plt_sym : 1;
1556 unsigned plt_not_loaded : 1;
1557 unsigned plt_alignment : 4;
1558 unsigned can_gc_sections : 1;
1559 unsigned can_refcount : 1;
1560 unsigned want_got_sym : 1;
1561 unsigned want_dynbss : 1;
1562 unsigned want_dynrelro : 1;
1564 /* Targets which do not support physical addressing often require
1565 that the p_paddr field in the section header to be set to zero.
1566 This field indicates whether this behavior is required. */
1567 unsigned want_p_paddr_set_to_zero : 1;
1569 /* Target has broken hardware and/or kernel that requires pages not
1570 to be mapped twice with different permissions. */
1571 unsigned no_page_alias : 1;
1573 /* True if an object file lacking a .note.GNU-stack section
1574 should be assumed to be requesting exec stack. At least one
1575 other file in the link needs to have a .note.GNU-stack section
1576 for a PT_GNU_STACK segment to be created. */
1577 unsigned default_execstack : 1;
1579 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1580 in length rather than sec->size in length, if sec->rawsize is
1581 non-zero and smaller than sec->size. */
1582 unsigned caches_rawsize : 1;
1584 /* Address of protected data defined in the shared library may be
1585 external, i.e., due to copy relocation. */
1586 unsigned extern_protected_data : 1;
1588 /* True if `_bfd_elf_link_renumber_dynsyms' must be called even for
1590 unsigned always_renumber_dynsyms : 1;
1592 /* True if the 32-bit Linux PRPSINFO structure's `pr_uid' and `pr_gid'
1593 members use a 16-bit data type. */
1594 unsigned linux_prpsinfo32_ugid16 : 1;
1596 /* True if the 64-bit Linux PRPSINFO structure's `pr_uid' and `pr_gid'
1597 members use a 16-bit data type. */
1598 unsigned linux_prpsinfo64_ugid16 : 1;
1601 /* Information about reloc sections associated with a bfd_elf_section_data
1603 struct bfd_elf_section_reloc_data
1605 /* The ELF header for the reloc section associated with this
1607 Elf_Internal_Shdr *hdr;
1608 /* The number of relocations currently assigned to HDR. */
1610 /* The ELF section number of the reloc section. Only used for an
1613 /* Used by the backend linker to store the symbol hash table entries
1614 associated with relocs against global symbols. */
1615 struct elf_link_hash_entry **hashes;
1618 /* Information stored for each BFD section in an ELF file. This
1619 structure is allocated by elf_new_section_hook. */
1621 struct bfd_elf_section_data
1623 /* The ELF header for this section. */
1624 Elf_Internal_Shdr this_hdr;
1626 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1627 struct flag_info *section_flag_info;
1629 /* Information about the REL and RELA reloc sections associated
1630 with this section, if any. */
1631 struct bfd_elf_section_reloc_data rel, rela;
1633 /* The ELF section number of this section. */
1636 /* Used by the backend linker when generating a shared library to
1637 record the dynamic symbol index for a section symbol
1638 corresponding to this section. A value of 0 means that there is
1639 no dynamic symbol for this section. */
1642 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1643 asection *linked_to;
1645 /* A pointer to the swapped relocs. If the section uses REL relocs,
1646 rather than RELA, all the r_addend fields will be zero. This
1647 pointer may be NULL. It is used by the backend linker. */
1648 Elf_Internal_Rela *relocs;
1650 /* A pointer to a linked list tracking dynamic relocs copied for
1654 /* A pointer to the bfd section used for dynamic relocs. */
1658 /* Group name, if this section is a member of a group. */
1661 /* Group signature sym, if this is the SHT_GROUP section. */
1662 struct bfd_symbol *id;
1665 /* For a member of a group, points to the SHT_GROUP section.
1666 NULL for the SHT_GROUP section itself and non-group sections. */
1667 asection *sec_group;
1669 /* A linked list of member sections in the group. Circular when used by
1670 the linker. For the SHT_GROUP section, points at first member. */
1671 asection *next_in_group;
1673 /* The FDEs associated with this section. The u.fde.next_in_section
1674 field acts as a chain pointer. */
1675 struct eh_cie_fde *fde_list;
1677 /* Link from a text section to its .eh_frame_entry section. */
1678 asection *eh_frame_entry;
1680 /* A pointer used for various section optimizations. */
1684 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1685 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1686 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1687 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1688 #define elf_section_info(sec) (elf_section_data(sec)->this_hdr.sh_info)
1689 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1690 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1691 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1692 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1693 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1694 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1696 #define xvec_get_elf_backend_data(xvec) \
1697 ((const struct elf_backend_data *) (xvec)->backend_data)
1699 #define get_elf_backend_data(abfd) \
1700 xvec_get_elf_backend_data ((abfd)->xvec)
1702 /* The least object attributes (within an attributes subsection) known
1703 for any target. Some code assumes that the value 0 is not used and
1704 the field for that attribute can instead be used as a marker to
1705 indicate that attributes have been initialized. */
1706 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1708 /* The maximum number of known object attributes for any target. */
1709 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1711 /* The value of an object attribute. The type indicates whether the attribute
1712 holds and integer, a string, or both. It can also indicate that there can
1713 be no default (i.e. all values must be written to file, even zero), or
1714 that the value is in error and should not be written to file. */
1716 typedef struct obj_attribute
1718 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1719 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1720 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1721 #define ATTR_TYPE_FLAG_ERROR (1 << 3)
1723 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1724 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1725 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1726 #define ATTR_TYPE_HAS_ERROR(TYPE) ((TYPE) & ATTR_TYPE_FLAG_ERROR)
1733 typedef struct obj_attribute_list
1735 struct obj_attribute_list *next;
1738 } obj_attribute_list;
1740 /* Object attributes may either be defined by the processor ABI, index
1741 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1742 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1743 #define OBJ_ATTR_PROC 0
1744 #define OBJ_ATTR_GNU 1
1745 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1746 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1748 /* The following object attribute tags are taken as generic, for all
1749 targets and for "gnu" where there is no target standard. */
1756 Tag_compatibility = 32
1759 /* The following struct stores information about every SystemTap section
1760 found in the object file. */
1763 struct sdt_note *next;
1768 /* tdata information grabbed from an elf core file. */
1769 struct core_elf_obj_tdata
1778 /* Extra tdata information held for output ELF BFDs. */
1779 struct output_elf_obj_tdata
1781 struct elf_segment_map *seg_map;
1782 struct elf_strtab_hash *strtab_ptr;
1784 /* STT_SECTION symbols for each section */
1785 asymbol **section_syms;
1787 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1789 asection *eh_frame_hdr;
1791 /* NT_GNU_BUILD_ID note type info. */
1794 bfd_boolean (*after_write_object_contents) (bfd *);
1799 /* Records the result of `get_program_header_size'. */
1800 bfd_size_type program_header_size;
1802 /* Used when laying out sections. */
1803 file_ptr next_file_pos;
1805 int num_section_syms;
1806 unsigned int shstrtab_section, strtab_section;
1808 /* Segment flags for the PT_GNU_STACK segment. */
1809 unsigned int stack_flags;
1811 /* Used to determine if the e_flags field has been initialized */
1812 bfd_boolean flags_init;
1815 /* Indicate if the bfd contains SHF_GNU_MBIND sections or symbols that
1816 have the STT_GNU_IFUNC symbol type or STB_GNU_UNIQUE binding. Used
1817 to set the osabi field in the ELF header structure. */
1820 elf_gnu_osabi_mbind = 1 << 0,
1821 elf_gnu_osabi_ifunc = 1 << 1,
1822 elf_gnu_osabi_unique = 1 << 2,
1825 typedef struct elf_section_list
1827 Elf_Internal_Shdr hdr;
1829 struct elf_section_list * next;
1832 /* Some private data is stashed away for future use using the tdata pointer
1833 in the bfd structure. */
1835 struct elf_obj_tdata
1837 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1838 Elf_Internal_Shdr **elf_sect_ptr;
1839 Elf_Internal_Phdr *phdr;
1840 Elf_Internal_Shdr symtab_hdr;
1841 Elf_Internal_Shdr shstrtab_hdr;
1842 Elf_Internal_Shdr strtab_hdr;
1843 Elf_Internal_Shdr dynsymtab_hdr;
1844 Elf_Internal_Shdr dynstrtab_hdr;
1845 Elf_Internal_Shdr dynversym_hdr;
1846 Elf_Internal_Shdr dynverref_hdr;
1847 Elf_Internal_Shdr dynverdef_hdr;
1848 elf_section_list * symtab_shndx_list;
1849 bfd_vma gp; /* The gp value */
1850 unsigned int gp_size; /* The gp size */
1851 unsigned int num_elf_sections; /* elf_sect_ptr size */
1853 /* A mapping from external symbols to entries in the linker hash
1854 table, used when linking. This is indexed by the symbol index
1855 minus the sh_info field of the symbol table header. */
1856 struct elf_link_hash_entry **sym_hashes;
1858 /* Track usage and final offsets of GOT entries for local symbols.
1859 This array is indexed by symbol index. Elements are used
1860 identically to "got" in struct elf_link_hash_entry. */
1863 bfd_signed_vma *refcounts;
1865 struct got_entry **ents;
1868 /* The linker ELF emulation code needs to let the backend ELF linker
1869 know what filename should be used for a dynamic object if the
1870 dynamic object is found using a search. The emulation code then
1871 sometimes needs to know what name was actually used. Until the
1872 file has been added to the linker symbol table, this field holds
1873 the name the linker wants. After it has been added, it holds the
1874 name actually used, which will be the DT_SONAME entry if there is
1876 const char *dt_name;
1878 /* The linker emulation needs to know what audit libs
1879 are used by a dynamic object. */
1880 const char *dt_audit;
1882 /* Used by find_nearest_line entry point. */
1885 /* A place to stash dwarf1 info for this bfd. */
1886 struct dwarf1_debug *dwarf1_find_line_info;
1888 /* A place to stash dwarf2 info for this bfd. */
1889 void *dwarf2_find_line_info;
1891 /* Stash away info for yet another find line/function variant. */
1892 void *elf_find_function_cache;
1894 /* Number of symbol version definitions we are about to emit. */
1895 unsigned int cverdefs;
1897 /* Number of symbol version references we are about to emit. */
1898 unsigned int cverrefs;
1900 /* Symbol version definitions in external objects. */
1901 Elf_Internal_Verdef *verdef;
1903 /* Symbol version references to external objects. */
1904 Elf_Internal_Verneed *verref;
1906 /* A pointer to the .eh_frame section. */
1907 asection *eh_frame_section;
1909 /* Symbol buffer. */
1912 /* List of GNU properties. Will be updated by setup_gnu_properties
1913 after all input GNU properties are merged for output. */
1914 elf_property_list *properties;
1916 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1917 obj_attribute_list *other_obj_attributes[2];
1919 /* Linked-list containing information about every Systemtap section
1920 found in the object file. Each section corresponds to one entry
1922 struct sdt_note *sdt_note_head;
1924 Elf_Internal_Shdr **group_sect_ptr;
1927 /* Index into group_sect_ptr, updated by setup_group when finding a
1928 section's group. Used to optimize subsequent group searches. */
1929 unsigned int group_search_offset;
1931 unsigned int symtab_section, dynsymtab_section;
1932 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1934 /* An identifier used to distinguish different target
1935 specific extensions to this structure. */
1936 ENUM_BITFIELD (elf_target_id) object_id : 6;
1938 /* Whether a dyanmic object was specified normally on the linker
1939 command line, or was specified when --as-needed was in effect,
1940 or was found via a DT_NEEDED entry. */
1941 ENUM_BITFIELD (dynamic_lib_link_class) dyn_lib_class : 4;
1943 /* Whether the bfd uses OS specific bits that require ELFOSABI_GNU. */
1944 ENUM_BITFIELD (elf_gnu_osabi) has_gnu_osabi : 3;
1946 /* Whether if the bfd contains the GNU_PROPERTY_NO_COPY_ON_PROTECTED
1948 unsigned int has_no_copy_on_protected : 1;
1950 /* Irix 5 often screws up the symbol table, sorting local symbols
1951 after global symbols. This flag is set if the symbol table in
1952 this BFD appears to be screwed up. If it is, we ignore the
1953 sh_info field in the symbol table header, and always read all the
1955 unsigned int bad_symtab : 1;
1957 /* Information grabbed from an elf core file. */
1958 struct core_elf_obj_tdata *core;
1960 /* More information held for output ELF BFDs. */
1961 struct output_elf_obj_tdata *o;
1964 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1966 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1967 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1968 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1969 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1970 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1971 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1972 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1973 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1974 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1975 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1976 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1977 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list)
1978 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1979 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1980 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1981 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1982 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1983 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1984 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1985 #define elf_eh_frame_section(bfd) \
1986 (elf_tdata(bfd) -> eh_frame_section)
1987 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1988 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1989 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1990 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1991 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1992 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1993 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1994 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1995 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1996 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1997 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1998 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1999 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
2000 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
2001 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
2002 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
2003 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
2004 #define elf_known_obj_attributes_proc(bfd) \
2005 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
2006 #define elf_other_obj_attributes_proc(bfd) \
2007 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
2008 #define elf_properties(bfd) (elf_tdata (bfd) -> properties)
2009 #define elf_has_no_copy_on_protected(bfd) \
2010 (elf_tdata(bfd) -> has_no_copy_on_protected)
2012 extern void _bfd_elf_swap_verdef_in
2013 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
2014 extern void _bfd_elf_swap_verdef_out
2015 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
2016 extern void _bfd_elf_swap_verdaux_in
2017 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
2018 extern void _bfd_elf_swap_verdaux_out
2019 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
2020 extern void _bfd_elf_swap_verneed_in
2021 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
2022 extern void _bfd_elf_swap_verneed_out
2023 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
2024 extern void _bfd_elf_swap_vernaux_in
2025 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
2026 extern void _bfd_elf_swap_vernaux_out
2027 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
2028 extern void _bfd_elf_swap_versym_in
2029 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
2030 extern void _bfd_elf_swap_versym_out
2031 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
2033 extern unsigned int _bfd_elf_section_from_bfd_section
2034 (bfd *, asection *);
2035 extern char *bfd_elf_string_from_elf_section
2036 (bfd *, unsigned, unsigned);
2037 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
2038 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
2039 Elf_External_Sym_Shndx *);
2040 extern const char *bfd_elf_sym_name
2041 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
2043 extern bfd_boolean _bfd_elf_copy_private_bfd_data
2045 extern bfd_boolean _bfd_elf_print_private_bfd_data
2047 const char * _bfd_elf_get_symbol_version_string
2048 (bfd *, asymbol *, bfd_boolean *);
2049 extern void bfd_elf_print_symbol
2050 (bfd *, void *, asymbol *, bfd_print_symbol_type);
2052 extern unsigned int _bfd_elf_eh_frame_address_size
2053 (bfd *, const asection *);
2054 extern bfd_byte _bfd_elf_encode_eh_address
2055 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
2056 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
2057 extern bfd_boolean _bfd_elf_can_make_relative
2058 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
2060 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
2061 (const struct bfd_link_info *, const asection *,
2062 const Elf_Internal_Rela *);
2063 extern bfd_vma _bfd_elf_rela_local_sym
2064 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
2065 extern bfd_vma _bfd_elf_rel_local_sym
2066 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
2067 extern bfd_vma _bfd_elf_section_offset
2068 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2070 extern unsigned long bfd_elf_hash
2072 extern unsigned long bfd_elf_gnu_hash
2075 extern bfd_reloc_status_type bfd_elf_generic_reloc
2076 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
2077 extern bfd_boolean bfd_elf_allocate_object
2078 (bfd *, size_t, enum elf_target_id);
2079 extern bfd_boolean bfd_elf_make_object
2081 extern bfd_boolean bfd_elf_mkcorefile
2083 extern bfd_boolean _bfd_elf_make_section_from_shdr
2084 (bfd *, Elf_Internal_Shdr *, const char *, int);
2085 extern bfd_boolean _bfd_elf_make_section_from_phdr
2086 (bfd *, Elf_Internal_Phdr *, int, const char *);
2087 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
2088 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
2089 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
2091 extern void _bfd_elf_link_hash_table_free
2093 extern void _bfd_elf_link_hash_copy_indirect
2094 (struct bfd_link_info *, struct elf_link_hash_entry *,
2095 struct elf_link_hash_entry *);
2096 extern void _bfd_elf_link_hash_hide_symbol
2097 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
2098 extern void _bfd_elf_link_hide_symbol
2099 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *);
2100 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
2101 (struct bfd_link_info *, struct elf_link_hash_entry *);
2102 extern bfd_boolean _bfd_elf_link_hash_table_init
2103 (struct elf_link_hash_table *, bfd *,
2104 struct bfd_hash_entry *(*)
2105 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
2106 unsigned int, enum elf_target_id);
2107 extern bfd_boolean _bfd_elf_slurp_version_tables
2108 (bfd *, bfd_boolean);
2109 extern bfd_boolean _bfd_elf_merge_sections
2110 (bfd *, struct bfd_link_info *);
2111 extern bfd_boolean _bfd_elf_match_sections_by_type
2112 (bfd *, const asection *, bfd *, const asection *);
2113 extern bfd_boolean bfd_elf_is_group_section
2114 (bfd *, const struct bfd_section *);
2115 extern bfd_boolean _bfd_elf_section_already_linked
2116 (bfd *, asection *, struct bfd_link_info *);
2117 extern void bfd_elf_set_group_contents
2118 (bfd *, asection *, void *);
2119 extern unsigned int _bfd_elf_filter_global_symbols
2120 (bfd *, struct bfd_link_info *, asymbol **, long);
2121 extern asection *_bfd_elf_check_kept_section
2122 (asection *, struct bfd_link_info *);
2123 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
2124 extern void _bfd_elf_copy_link_hash_symbol_type
2125 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
2126 extern bfd_boolean _bfd_elf_size_group_sections
2127 (struct bfd_link_info *);
2128 extern bfd_boolean _bfd_elf_fixup_group_sections
2129 (bfd *, asection *);
2130 extern bfd_boolean _bfd_elf_copy_private_header_data
2132 extern bfd_boolean _bfd_elf_copy_private_symbol_data
2133 (bfd *, asymbol *, bfd *, asymbol *);
2134 #define _bfd_generic_init_private_section_data \
2135 _bfd_elf_init_private_section_data
2136 extern bfd_boolean _bfd_elf_init_private_section_data
2137 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
2138 extern bfd_boolean _bfd_elf_copy_private_section_data
2139 (bfd *, asection *, bfd *, asection *);
2140 extern bfd_boolean _bfd_elf_write_object_contents
2142 extern bfd_boolean _bfd_elf_write_corefile_contents
2144 extern bfd_boolean _bfd_elf_set_section_contents
2145 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
2146 extern long _bfd_elf_get_symtab_upper_bound
2148 extern long _bfd_elf_canonicalize_symtab
2149 (bfd *, asymbol **);
2150 extern long _bfd_elf_get_dynamic_symtab_upper_bound
2152 extern long _bfd_elf_canonicalize_dynamic_symtab
2153 (bfd *, asymbol **);
2154 extern long _bfd_elf_get_synthetic_symtab
2155 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
2156 extern long _bfd_elf_get_reloc_upper_bound
2158 extern long _bfd_elf_canonicalize_reloc
2159 (bfd *, sec_ptr, arelent **, asymbol **);
2160 extern asection * _bfd_elf_get_dynamic_reloc_section
2161 (bfd *, asection *, bfd_boolean);
2162 extern asection * _bfd_elf_make_dynamic_reloc_section
2163 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
2164 extern long _bfd_elf_get_dynamic_reloc_upper_bound
2166 extern long _bfd_elf_canonicalize_dynamic_reloc
2167 (bfd *, arelent **, asymbol **);
2168 extern asymbol *_bfd_elf_make_empty_symbol
2170 extern void _bfd_elf_get_symbol_info
2171 (bfd *, asymbol *, symbol_info *);
2172 extern bfd_boolean _bfd_elf_is_local_label_name
2173 (bfd *, const char *);
2174 extern alent *_bfd_elf_get_lineno
2176 extern bfd_boolean _bfd_elf_set_arch_mach
2177 (bfd *, enum bfd_architecture, unsigned long);
2178 extern bfd_boolean _bfd_elf_find_nearest_line
2179 (bfd *, asymbol **, asection *, bfd_vma,
2180 const char **, const char **, unsigned int *, unsigned int *);
2181 extern bfd_boolean _bfd_elf_find_line
2182 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
2183 extern bfd_boolean _bfd_elf_find_inliner_info
2184 (bfd *, const char **, const char **, unsigned int *);
2185 extern asymbol *_bfd_elf_find_function
2186 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
2187 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
2188 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
2189 extern int _bfd_elf_sizeof_headers
2190 (bfd *, struct bfd_link_info *);
2191 extern bfd_boolean _bfd_elf_new_section_hook
2192 (bfd *, asection *);
2193 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
2194 (const char *, const struct bfd_elf_special_section *, unsigned int);
2195 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
2196 (bfd *, asection *);
2198 extern bfd_boolean _bfd_elf_link_hide_sym_by_version
2199 (struct bfd_link_info *, struct elf_link_hash_entry *);
2201 /* If the target doesn't have reloc handling written yet: */
2202 extern bfd_boolean _bfd_elf_no_info_to_howto
2203 (bfd *, arelent *, Elf_Internal_Rela *);
2205 extern bfd_boolean bfd_section_from_shdr
2206 (bfd *, unsigned int shindex);
2207 extern bfd_boolean bfd_section_from_phdr
2208 (bfd *, Elf_Internal_Phdr *, int);
2210 extern int _bfd_elf_symbol_from_bfd_symbol
2211 (bfd *, asymbol **);
2213 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
2214 (struct sym_cache *, bfd *, unsigned long);
2215 extern asection *bfd_section_from_elf_index
2216 (bfd *, unsigned int);
2218 extern struct elf_strtab_hash * _bfd_elf_strtab_init
2220 extern void _bfd_elf_strtab_free
2221 (struct elf_strtab_hash *);
2222 extern size_t _bfd_elf_strtab_add
2223 (struct elf_strtab_hash *, const char *, bfd_boolean);
2224 extern void _bfd_elf_strtab_addref
2225 (struct elf_strtab_hash *, size_t);
2226 extern void _bfd_elf_strtab_delref
2227 (struct elf_strtab_hash *, size_t);
2228 extern unsigned int _bfd_elf_strtab_refcount
2229 (struct elf_strtab_hash *, size_t);
2230 extern void _bfd_elf_strtab_clear_all_refs
2231 (struct elf_strtab_hash *);
2232 extern void *_bfd_elf_strtab_save
2233 (struct elf_strtab_hash *);
2234 extern void _bfd_elf_strtab_restore
2235 (struct elf_strtab_hash *, void *);
2236 extern bfd_size_type _bfd_elf_strtab_size
2237 (struct elf_strtab_hash *);
2238 extern bfd_size_type _bfd_elf_strtab_offset
2239 (struct elf_strtab_hash *, size_t);
2240 extern bfd_boolean _bfd_elf_strtab_emit
2241 (bfd *, struct elf_strtab_hash *);
2242 extern void _bfd_elf_strtab_finalize
2243 (struct elf_strtab_hash *);
2245 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2246 (bfd *, struct bfd_link_info *);
2247 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2248 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2249 extern void _bfd_elf_parse_eh_frame
2250 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2251 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2252 (struct bfd_link_info *info);
2254 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2255 (bfd *, struct bfd_link_info *, asection *,
2256 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2257 extern bfd_boolean _bfd_elf_adjust_eh_frame_global_symbol
2258 (struct elf_link_hash_entry *, void *);
2259 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2260 (bfd *, struct bfd_link_info *);
2261 extern bfd_vma _bfd_elf_eh_frame_section_offset
2262 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2263 extern bfd_boolean _bfd_elf_write_section_eh_frame
2264 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2265 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2266 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2267 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2268 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2269 (bfd *, struct bfd_link_info *);
2270 extern bfd_boolean _bfd_elf_eh_frame_present
2271 (struct bfd_link_info *);
2272 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2273 (struct bfd_link_info *);
2274 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2275 (struct bfd_link_info *);
2277 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2279 extern long _bfd_elf_link_lookup_local_dynindx
2280 (struct bfd_link_info *, bfd *, long);
2281 extern bfd_boolean _bfd_elf_compute_section_file_positions
2282 (bfd *, struct bfd_link_info *);
2283 extern file_ptr _bfd_elf_assign_file_position_for_section
2284 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2286 extern bfd_boolean _bfd_elf_validate_reloc
2289 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2290 (bfd *, struct bfd_link_info *);
2291 extern bfd_boolean _bfd_elf_omit_section_dynsym_default
2292 (bfd *, struct bfd_link_info *, asection *);
2293 extern bfd_boolean _bfd_elf_omit_section_dynsym_all
2294 (bfd *, struct bfd_link_info *, asection *);
2295 extern bfd_boolean _bfd_elf_create_dynamic_sections
2296 (bfd *, struct bfd_link_info *);
2297 extern bfd_boolean _bfd_elf_create_got_section
2298 (bfd *, struct bfd_link_info *);
2299 extern asection *_bfd_elf_section_for_symbol
2300 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2301 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2302 (bfd *, struct bfd_link_info *, asection *, const char *);
2303 extern void _bfd_elf_init_1_index_section
2304 (bfd *, struct bfd_link_info *);
2305 extern void _bfd_elf_init_2_index_sections
2306 (bfd *, struct bfd_link_info *);
2308 extern bfd_boolean _bfd_elfcore_make_pseudosection
2309 (bfd *, char *, size_t, ufile_ptr);
2310 extern char *_bfd_elfcore_strndup
2311 (bfd *, char *, size_t);
2313 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2314 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2316 extern bfd_boolean _bfd_elf_link_output_relocs
2317 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2318 struct elf_link_hash_entry **);
2320 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2321 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2323 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2324 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2326 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2327 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2329 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2330 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2332 extern bfd_boolean _bfd_elf_setup_sections
2335 extern struct bfd_link_hash_entry *bfd_elf_define_start_stop
2336 (struct bfd_link_info *, const char *, asection *);
2338 extern void _bfd_elf_post_process_headers (bfd *, struct bfd_link_info *);
2340 extern bfd_boolean _bfd_elf_final_write_processing (bfd *);
2342 extern const bfd_target *bfd_elf32_object_p
2344 extern const bfd_target *bfd_elf32_core_file_p
2346 extern char *bfd_elf32_core_file_failing_command
2348 extern int bfd_elf32_core_file_failing_signal
2350 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2352 extern int bfd_elf32_core_file_pid
2355 extern bfd_boolean bfd_elf32_swap_symbol_in
2356 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2357 extern void bfd_elf32_swap_symbol_out
2358 (bfd *, const Elf_Internal_Sym *, void *, void *);
2359 extern void bfd_elf32_swap_reloc_in
2360 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2361 extern void bfd_elf32_swap_reloc_out
2362 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2363 extern void bfd_elf32_swap_reloca_in
2364 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2365 extern void bfd_elf32_swap_reloca_out
2366 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2367 extern void bfd_elf32_swap_phdr_in
2368 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2369 extern void bfd_elf32_swap_phdr_out
2370 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2371 extern void bfd_elf32_swap_dyn_in
2372 (bfd *, const void *, Elf_Internal_Dyn *);
2373 extern void bfd_elf32_swap_dyn_out
2374 (bfd *, const Elf_Internal_Dyn *, void *);
2375 extern long bfd_elf32_slurp_symbol_table
2376 (bfd *, asymbol **, bfd_boolean);
2377 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2379 extern int bfd_elf32_write_out_phdrs
2380 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2381 extern bfd_boolean bfd_elf32_checksum_contents
2382 (bfd * , void (*) (const void *, size_t, void *), void *);
2383 extern void bfd_elf32_write_relocs
2384 (bfd *, asection *, void *);
2385 extern bfd_boolean bfd_elf32_slurp_reloc_table
2386 (bfd *, asection *, asymbol **, bfd_boolean);
2388 extern const bfd_target *bfd_elf64_object_p
2390 extern const bfd_target *bfd_elf64_core_file_p
2392 extern char *bfd_elf64_core_file_failing_command
2394 extern int bfd_elf64_core_file_failing_signal
2396 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2398 extern int bfd_elf64_core_file_pid
2401 extern bfd_boolean bfd_elf64_swap_symbol_in
2402 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2403 extern void bfd_elf64_swap_symbol_out
2404 (bfd *, const Elf_Internal_Sym *, void *, void *);
2405 extern void bfd_elf64_swap_reloc_in
2406 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2407 extern void bfd_elf64_swap_reloc_out
2408 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2409 extern void bfd_elf64_swap_reloca_in
2410 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2411 extern void bfd_elf64_swap_reloca_out
2412 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2413 extern void bfd_elf64_swap_phdr_in
2414 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2415 extern void bfd_elf64_swap_phdr_out
2416 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2417 extern void bfd_elf64_swap_dyn_in
2418 (bfd *, const void *, Elf_Internal_Dyn *);
2419 extern void bfd_elf64_swap_dyn_out
2420 (bfd *, const Elf_Internal_Dyn *, void *);
2421 extern long bfd_elf64_slurp_symbol_table
2422 (bfd *, asymbol **, bfd_boolean);
2423 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2425 extern int bfd_elf64_write_out_phdrs
2426 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2427 extern bfd_boolean bfd_elf64_checksum_contents
2428 (bfd * , void (*) (const void *, size_t, void *), void *);
2429 extern void bfd_elf64_write_relocs
2430 (bfd *, asection *, void *);
2431 extern bfd_boolean bfd_elf64_slurp_reloc_table
2432 (bfd *, asection *, asymbol **, bfd_boolean);
2434 extern bfd_boolean _bfd_elf_default_relocs_compatible
2435 (const bfd_target *, const bfd_target *);
2437 extern bfd_boolean _bfd_elf_relocs_compatible
2438 (const bfd_target *, const bfd_target *);
2439 extern bfd_boolean _bfd_elf_notice_as_needed
2440 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2442 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2443 (bfd *, struct bfd_link_info *, const char *);
2444 extern bfd_boolean bfd_elf_link_add_symbols
2445 (bfd *, struct bfd_link_info *);
2446 extern bfd_boolean _bfd_elf_add_dynamic_entry
2447 (struct bfd_link_info *, bfd_vma, bfd_vma);
2448 extern bfd_boolean _bfd_elf_link_check_relocs
2449 (bfd *, struct bfd_link_info *);
2451 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2452 (struct bfd_link_info *, struct elf_link_hash_entry *);
2454 extern int bfd_elf_link_record_local_dynamic_symbol
2455 (struct bfd_link_info *, bfd *, long);
2457 extern bfd_boolean _bfd_elf_close_and_cleanup
2460 extern bfd_boolean _bfd_elf_common_definition
2461 (Elf_Internal_Sym *);
2463 extern unsigned int _bfd_elf_common_section_index
2466 extern asection *_bfd_elf_common_section
2469 extern bfd_vma _bfd_elf_default_got_elt_size
2470 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2473 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2474 (bfd *, arelent *, struct bfd_symbol *, void *,
2475 asection *, bfd *, char **);
2477 extern bfd_boolean bfd_elf_final_link
2478 (bfd *, struct bfd_link_info *);
2480 extern void _bfd_elf_gc_keep
2481 (struct bfd_link_info *info);
2483 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2484 (struct elf_link_hash_entry *h, void *inf);
2486 extern bfd_boolean bfd_elf_gc_sections
2487 (bfd *, struct bfd_link_info *);
2489 extern bfd_boolean bfd_elf_gc_record_vtinherit
2490 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2492 extern bfd_boolean bfd_elf_gc_record_vtentry
2493 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2495 extern asection *_bfd_elf_gc_mark_hook
2496 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2497 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2499 extern asection *_bfd_elf_gc_mark_rsec
2500 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2501 struct elf_reloc_cookie *, bfd_boolean *);
2503 extern bfd_boolean _bfd_elf_gc_mark_reloc
2504 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2505 struct elf_reloc_cookie *);
2507 extern bfd_boolean _bfd_elf_gc_mark_fdes
2508 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2509 struct elf_reloc_cookie *);
2511 extern bfd_boolean _bfd_elf_gc_mark
2512 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2514 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2515 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2517 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2518 (bfd *, struct bfd_link_info *);
2520 extern bfd_boolean bfd_elf_gc_common_final_link
2521 (bfd *, struct bfd_link_info *);
2523 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2526 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2527 (bfd *, asection *);
2529 extern bfd_boolean _bfd_elf_map_sections_to_segments
2530 (bfd *, struct bfd_link_info *);
2532 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2534 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2537 extern asection *_bfd_elf_plt_get_reloc_section (bfd *, const char *);
2539 extern int bfd_elf_get_default_section_type (flagword);
2541 extern bfd_boolean bfd_elf_lookup_section_flags
2542 (struct bfd_link_info *, struct flag_info *, asection *);
2544 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2545 (bfd * abfd, asection * section);
2547 /* PowerPC @tls opcode transform/validate. */
2548 extern unsigned int _bfd_elf_ppc_at_tls_transform
2549 (unsigned int, unsigned int);
2550 /* PowerPC @tprel opcode transform/validate. */
2551 extern unsigned int _bfd_elf_ppc_at_tprel_transform
2552 (unsigned int, unsigned int);
2553 /* PowerPC elf_object_p tweak. */
2554 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *);
2555 /* PowerPC .gnu.attributes handling common to both 32-bit and 64-bit. */
2556 extern bfd_boolean _bfd_elf_ppc_merge_fp_attributes
2557 (bfd *, struct bfd_link_info *);
2559 /* Exported interface for writing elf corefile notes. */
2560 extern char *elfcore_write_note
2561 (bfd *, char *, int *, const char *, int, const void *, int);
2562 extern char *elfcore_write_prpsinfo
2563 (bfd *, char *, int *, const char *, const char *);
2564 extern char *elfcore_write_prstatus
2565 (bfd *, char *, int *, long, int, const void *);
2566 extern char * elfcore_write_pstatus
2567 (bfd *, char *, int *, long, int, const void *);
2568 extern char *elfcore_write_prfpreg
2569 (bfd *, char *, int *, const void *, int);
2570 extern char *elfcore_write_prxfpreg
2571 (bfd *, char *, int *, const void *, int);
2572 extern char *elfcore_write_xstatereg
2573 (bfd *, char *, int *, const void *, int);
2574 extern char *elfcore_write_ppc_vmx
2575 (bfd *, char *, int *, const void *, int);
2576 extern char *elfcore_write_ppc_vsx
2577 (bfd *, char *, int *, const void *, int);
2578 extern char *elfcore_write_ppc_tar
2579 (bfd *, char *, int *, const void *, int);
2580 extern char *elfcore_write_ppc_ppr
2581 (bfd *, char *, int *, const void *, int);
2582 extern char *elfcore_write_ppc_dscr
2583 (bfd *, char *, int *, const void *, int);
2584 extern char *elfcore_write_ppc_ebb
2585 (bfd *, char *, int *, const void *, int);
2586 extern char *elfcore_write_ppc_pmu
2587 (bfd *, char *, int *, const void *, int);
2588 extern char *elfcore_write_ppc_tm_cgpr
2589 (bfd *, char *, int *, const void *, int);
2590 extern char *elfcore_write_ppc_tm_cfpr
2591 (bfd *, char *, int *, const void *, int);
2592 extern char *elfcore_write_ppc_tm_cvmx
2593 (bfd *, char *, int *, const void *, int);
2594 extern char *elfcore_write_ppc_tm_cvsx
2595 (bfd *, char *, int *, const void *, int);
2596 extern char *elfcore_write_ppc_tm_spr
2597 (bfd *, char *, int *, const void *, int);
2598 extern char *elfcore_write_ppc_tm_ctar
2599 (bfd *, char *, int *, const void *, int);
2600 extern char *elfcore_write_ppc_tm_cppr
2601 (bfd *, char *, int *, const void *, int);
2602 extern char *elfcore_write_ppc_tm_cdscr
2603 (bfd *, char *, int *, const void *, int);
2604 extern char *elfcore_write_s390_timer
2605 (bfd *, char *, int *, const void *, int);
2606 extern char *elfcore_write_s390_todcmp
2607 (bfd *, char *, int *, const void *, int);
2608 extern char *elfcore_write_s390_todpreg
2609 (bfd *, char *, int *, const void *, int);
2610 extern char *elfcore_write_s390_ctrs
2611 (bfd *, char *, int *, const void *, int);
2612 extern char *elfcore_write_s390_prefix
2613 (bfd *, char *, int *, const void *, int);
2614 extern char *elfcore_write_s390_last_break
2615 (bfd *, char *, int *, const void *, int);
2616 extern char *elfcore_write_s390_system_call
2617 (bfd *, char *, int *, const void *, int);
2618 extern char *elfcore_write_s390_tdb
2619 (bfd *, char *, int *, const void *, int);
2620 extern char *elfcore_write_s390_vxrs_low
2621 (bfd *, char *, int *, const void *, int);
2622 extern char *elfcore_write_s390_vxrs_high
2623 (bfd *, char *, int *, const void *, int);
2624 extern char *elfcore_write_s390_gs_cb
2625 (bfd *, char *, int *, const void *, int);
2626 extern char *elfcore_write_s390_gs_bc
2627 (bfd *, char *, int *, const void *, int);
2628 extern char *elfcore_write_arm_vfp
2629 (bfd *, char *, int *, const void *, int);
2630 extern char *elfcore_write_aarch_tls
2631 (bfd *, char *, int *, const void *, int);
2632 extern char *elfcore_write_aarch_hw_break
2633 (bfd *, char *, int *, const void *, int);
2634 extern char *elfcore_write_aarch_hw_watch
2635 (bfd *, char *, int *, const void *, int);
2636 extern char *elfcore_write_aarch_sve
2637 (bfd *, char *, int *, const void *, int);
2638 extern char *elfcore_write_aarch_pauth
2639 (bfd *, char *, int *, const void *, int);
2640 extern char *elfcore_write_lwpstatus
2641 (bfd *, char *, int *, long, int, const void *);
2642 extern char *elfcore_write_register_note
2643 (bfd *, char *, int *, const char *, const void *, int);
2645 /* Internal structure which holds information to be included in the
2646 PRPSINFO section of Linux core files.
2648 This is an "internal" structure in the sense that it should be used
2649 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2650 function), so things like endianess shouldn't be an issue. This
2651 structure will eventually be converted in one of the
2652 `elf_external_linux_*' structures and written out to an output bfd
2653 by one of the functions declared below. */
2655 struct elf_internal_linux_prpsinfo
2657 char pr_state; /* Numeric process state. */
2658 char pr_sname; /* Char for pr_state. */
2659 char pr_zomb; /* Zombie. */
2660 char pr_nice; /* Nice val. */
2661 unsigned long pr_flag; /* Flags. */
2662 unsigned int pr_uid;
2663 unsigned int pr_gid;
2664 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2665 char pr_fname[16 + 1]; /* Filename of executable. */
2666 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2669 /* Linux/most 32-bit archs. */
2670 extern char *elfcore_write_linux_prpsinfo32
2671 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2673 /* Linux/most 64-bit archs. */
2674 extern char *elfcore_write_linux_prpsinfo64
2675 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2677 extern bfd *_bfd_elf32_bfd_from_remote_memory
2678 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2679 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2680 extern bfd *_bfd_elf64_bfd_from_remote_memory
2681 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2682 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2684 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2685 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2686 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int);
2687 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int);
2688 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2689 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2690 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *);
2691 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2692 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2693 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int,
2694 unsigned int, const char *);
2695 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2696 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2699 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2700 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2701 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int);
2702 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2703 extern bfd_boolean _bfd_elf_merge_object_attributes
2704 (bfd *, struct bfd_link_info *);
2705 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2706 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2707 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2709 extern bfd_boolean _bfd_elf_parse_gnu_properties
2710 (bfd *, Elf_Internal_Note *);
2711 extern elf_property * _bfd_elf_get_property
2712 (bfd *, unsigned int, unsigned int);
2713 extern bfd *_bfd_elf_link_setup_gnu_properties
2714 (struct bfd_link_info *);
2715 extern bfd_size_type _bfd_elf_convert_gnu_property_size
2717 extern bfd_boolean _bfd_elf_convert_gnu_properties
2718 (bfd *, asection *, bfd *, bfd_byte **, bfd_size_type *);
2720 /* The linker may need to keep track of the number of relocs that it
2721 decides to copy as dynamic relocs in check_relocs for each symbol.
2722 This is so that it can later discard them if they are found to be
2723 unnecessary. We can store the information in a field extending the
2724 regular ELF linker hash table. */
2726 struct elf_dyn_relocs
2728 struct elf_dyn_relocs *next;
2730 /* The input section of the reloc. */
2733 /* Total number of relocs copied for the input section. */
2734 bfd_size_type count;
2736 /* Number of pc-relative relocs copied for the input section. */
2737 bfd_size_type pc_count;
2740 extern bfd_boolean _bfd_elf_create_ifunc_sections
2741 (bfd *, struct bfd_link_info *);
2742 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2743 (struct bfd_link_info *, struct elf_link_hash_entry *,
2744 struct elf_dyn_relocs **, bfd_boolean *, unsigned int,
2745 unsigned int, unsigned int, bfd_boolean);
2747 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2748 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2750 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2751 extern bfd_vma elf64_r_sym (bfd_vma);
2752 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2753 extern bfd_vma elf32_r_sym (bfd_vma);
2755 extern bfd_boolean is_debuginfo_file (bfd *);
2757 /* Large common section. */
2758 extern asection _bfd_elf_large_com_section;
2760 /* Hash for local symbol with the first section id, ID, in the input
2761 file and the local symbol index, SYM. */
2762 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2763 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2764 ^ (SYM) ^ ((ID) >> 16))
2766 /* This is the condition under which finish_dynamic_symbol will be called.
2767 If our finish_dynamic_symbol isn't called, we'll need to do something
2768 about initializing any .plt and .got entries in relocate_section. */
2769 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2771 && ((SHARED) || !(H)->forced_local) \
2772 && ((H)->dynindx != -1 || (H)->forced_local))
2774 /* This macro is to avoid lots of duplicated code in the body
2775 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2776 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2777 r_symndx, symtab_hdr, sym_hashes, \
2778 h, sec, relocation, \
2779 unresolved_reloc, warned, ignored) \
2782 /* It seems this can happen with erroneous or unsupported \
2783 input (mixing a.out and elf in an archive, for example.) */ \
2784 if (sym_hashes == NULL) \
2787 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2789 if (info->wrap_hash != NULL \
2790 && (input_section->flags & SEC_DEBUGGING) != 0) \
2791 h = ((struct elf_link_hash_entry *) \
2792 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2794 while (h->root.type == bfd_link_hash_indirect \
2795 || h->root.type == bfd_link_hash_warning) \
2796 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2800 unresolved_reloc = FALSE; \
2802 if (h->root.type == bfd_link_hash_defined \
2803 || h->root.type == bfd_link_hash_defweak) \
2805 sec = h->root.u.def.section; \
2807 || sec->output_section == NULL) \
2808 /* Set a flag that will be cleared later if we find a \
2809 relocation value for this symbol. output_section \
2810 is typically NULL for symbols satisfied by a shared \
2812 unresolved_reloc = TRUE; \
2814 relocation = (h->root.u.def.value \
2815 + sec->output_section->vma \
2816 + sec->output_offset); \
2818 else if (h->root.type == bfd_link_hash_undefweak) \
2820 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2821 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2823 else if (!bfd_link_relocatable (info)) \
2826 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2827 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2828 (*info->callbacks->undefined_symbol) (info, \
2829 h->root.root.string, \
2832 rel->r_offset, err); \
2835 (void) unresolved_reloc; \
2841 /* This macro is to avoid lots of duplicated code in the body of the
2842 loop over relocations in xxx_relocate_section() in the various
2845 Handle relocations against symbols from removed linkonce sections,
2846 or sections discarded by a linker script. When doing a relocatable
2847 link, we remove such relocations. Otherwise, we just want the
2848 section contents zeroed and avoid any special processing. */
2849 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2850 rel, count, relend, \
2851 howto, index, contents) \
2854 _bfd_clear_contents (howto, input_bfd, input_section, \
2855 contents, rel[index].r_offset); \
2857 if (bfd_link_relocatable (info) \
2858 && (input_section->flags & SEC_DEBUGGING)) \
2860 /* Only remove relocations in debug sections since other \
2861 sections may require relocations. */ \
2862 Elf_Internal_Shdr *rel_hdr; \
2864 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2866 /* Avoid empty output section. */ \
2867 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2869 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2870 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2871 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2873 memmove (rel, rel + count, \
2874 (relend - rel - count) * sizeof (*rel)); \
2876 input_section->reloc_count -= count; \
2883 for (i_ = 0; i_ < count; i_++) \
2885 rel[i_].r_info = 0; \
2886 rel[i_].r_addend = 0; \
2892 /* Will a symbol be bound to the definition within the shared
2893 library, if any. A unique symbol can never be bound locally. */
2894 #define SYMBOLIC_BIND(INFO, H) \
2895 (!(H)->unique_global \
2896 && ((INFO)->symbolic \
2897 || (H)->start_stop \
2898 || ((INFO)->dynamic && !(H)->dynamic)))
2903 #endif /* _LIBELF_H_ */