1 /* BFD back-end data structures for ELF files.
2 Copyright (C) 1992-2017 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;
217 /* String table index in .dynstr if this is a dynamic symbol. */
218 unsigned long dynstr_index;
222 /* If this is a weak defined symbol from a dynamic object, this
223 field points to a defined symbol with the same value, if there is
224 one. Otherwise it is NULL. */
225 struct elf_link_hash_entry *weakdef;
227 /* Hash value of the name computed using the ELF hash function.
228 Used part way through size_dynamic_sections, after we've finished
230 unsigned long elf_hash_value;
233 /* Version information. */
236 /* This field is used for a symbol which is not defined in a
237 regular object. It points to the version information read in
238 from the dynamic object. */
239 Elf_Internal_Verdef *verdef;
240 /* This field is used for a symbol which is defined in a regular
241 object. It is set up in size_dynamic_sections. It points to
242 the version information we should write out for this symbol. */
243 struct bfd_elf_version_tree *vertree;
246 struct elf_link_virtual_table_entry *vtable;
249 /* Will references to this symbol always reference the symbol
251 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
252 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
254 /* Will _calls_ to this symbol always call the version in this object? */
255 #define SYMBOL_CALLS_LOCAL(INFO, H) \
256 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
258 /* Common symbols that are turned into definitions don't have the
259 DEF_REGULAR flag set, so they might appear to be undefined.
260 Symbols defined in linker scripts also don't have DEF_REGULAR set. */
261 #define ELF_COMMON_DEF_P(H) \
263 && !(H)->def_dynamic \
264 && (H)->root.type == bfd_link_hash_defined)
266 /* Records local symbols to be emitted in the dynamic symbol table. */
268 struct elf_link_local_dynamic_entry
270 struct elf_link_local_dynamic_entry *next;
272 /* The input bfd this symbol came from. */
275 /* The index of the local symbol being copied. */
278 /* The index in the outgoing dynamic symbol table. */
281 /* A copy of the input symbol. */
282 Elf_Internal_Sym isym;
285 struct elf_link_loaded_list
287 struct elf_link_loaded_list *next;
291 /* Structures used by the eh_frame optimization code. */
296 /* If REMOVED == 1, this is the CIE that the FDE originally used.
297 The CIE belongs to the same .eh_frame input section as the FDE.
299 If REMOVED == 0, this is the CIE that we have chosen to use for
300 the output FDE. The CIE's REMOVED field is also 0, but the CIE
301 might belong to a different .eh_frame input section from the FDE.
303 May be NULL to signify that the FDE should be discarded. */
304 struct eh_cie_fde *cie_inf;
305 struct eh_cie_fde *next_for_section;
308 /* CIEs have three states:
310 - REMOVED && !MERGED: Slated for removal because we haven't yet
311 proven that an FDE needs it. FULL_CIE, if nonnull, points to
312 more detailed information about the CIE.
314 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
315 which may not belong to the same input section.
317 - !REMOVED: We have decided to keep this CIE. SEC is the
318 .eh_frame input section that contains the CIE. */
320 struct cie *full_cie;
321 struct eh_cie_fde *merged_with;
325 /* The offset of the personality data from the start of the CIE,
326 or 0 if the CIE doesn't have any. */
327 unsigned int personality_offset : 8;
329 /* True if we have marked relocations associated with this CIE. */
330 unsigned int gc_mark : 1;
332 /* True if we have decided to turn an absolute LSDA encoding into
333 a PC-relative one. */
334 unsigned int make_lsda_relative : 1;
336 /* True if we have decided to turn an absolute personality
337 encoding into a PC-relative one. */
338 unsigned int make_per_encoding_relative : 1;
340 /* True if the CIE contains personality data and if that
341 data uses a PC-relative encoding. Always true when
342 make_per_encoding_relative is. */
343 unsigned int per_encoding_relative : 1;
345 /* True if the CIE contains personality data aligned to a
346 multiple of eight bytes. */
347 unsigned int per_encoding_aligned8 : 1;
349 /* True if we need to add an 'R' (FDE encoding) entry to the
350 CIE's augmentation data. */
351 unsigned int add_fde_encoding : 1;
353 /* True if we have merged this CIE with another. */
354 unsigned int merged : 1;
357 unsigned int pad1 : 17;
360 unsigned int reloc_index;
363 unsigned int new_offset;
364 unsigned int fde_encoding : 8;
365 unsigned int lsda_encoding : 8;
366 unsigned int lsda_offset : 8;
368 /* True if this entry represents a CIE, false if it represents an FDE. */
369 unsigned int cie : 1;
371 /* True if this entry is currently marked for removal. */
372 unsigned int removed : 1;
374 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
375 augmentation data, and an associated byte to each of the CIE's FDEs. */
376 unsigned int add_augmentation_size : 1;
378 /* True if we have decided to convert absolute FDE relocations into
379 relative ones. This applies to the first relocation in the FDE,
380 which is against the code that the FDE describes. */
381 unsigned int make_relative : 1;
384 unsigned int pad1 : 4;
386 unsigned int *set_loc;
389 struct eh_frame_sec_info
393 struct eh_cie_fde entry[1];
396 struct eh_frame_array_ent
405 #define DWARF2_EH_HDR 1
406 #define COMPACT_EH_HDR 2
408 /* Endian-neutral code indicating that a function cannot be unwound. */
409 #define COMPACT_EH_CANT_UNWIND_OPCODE 0x015d5d01
411 struct dwarf_eh_frame_hdr_info
414 unsigned int fde_count;
415 /* TRUE if .eh_frame_hdr should contain the sorted search table.
416 We build it if we successfully read all .eh_frame input sections
417 and recognize them. */
419 struct eh_frame_array_ent *array;
422 struct compact_eh_frame_hdr_info
424 unsigned int allocated_entries;
425 /* eh_frame_entry fragments. */
429 struct eh_frame_hdr_info
432 unsigned int array_count;
433 bfd_boolean frame_hdr_is_compact;
436 struct dwarf_eh_frame_hdr_info dwarf;
437 struct compact_eh_frame_hdr_info compact;
442 /* Enum used to identify target specific extensions to the elf_obj_tdata
443 and elf_link_hash_table structures. Note the enums deliberately start
444 from 1 so that we can detect an uninitialized field. The generic value
445 is last so that additions to this enum do not need to modify more than
449 AARCH64_ELF_DATA = 1,
489 struct elf_sym_strtab
491 Elf_Internal_Sym sym;
492 unsigned long dest_index;
493 unsigned long destshndx_index;
496 /* ELF linker hash table. */
498 struct elf_link_hash_table
500 struct bfd_link_hash_table root;
502 /* An identifier used to distinguish different target
503 specific extensions to this structure. */
504 enum elf_target_id hash_table_id;
506 /* Whether we have created the special dynamic sections required
507 when linking against or generating a shared object. */
508 bfd_boolean dynamic_sections_created;
510 /* True if this target has relocatable executables, so needs dynamic
512 bfd_boolean is_relocatable_executable;
514 /* The BFD used to hold special sections created by the linker.
515 This will be the first BFD found which requires these sections to
519 /* The value to use when initialising got.refcount/offset and
520 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
521 the values are refcounts. Set to init_got_offset/init_plt_offset
522 in size_dynamic_sections when the values may be offsets. */
523 union gotplt_union init_got_refcount;
524 union gotplt_union init_plt_refcount;
526 /* The value to use for got.refcount/offset and plt.refcount/offset
527 when the values may be offsets. Normally (bfd_vma) -1. */
528 union gotplt_union init_got_offset;
529 union gotplt_union init_plt_offset;
531 /* The number of symbols found in the link which is intended for the
532 mandatory DT_SYMTAB tag (.dynsym section) in .dynamic section. */
533 bfd_size_type dynsymcount;
534 bfd_size_type local_dynsymcount;
536 /* The string table of dynamic symbols, which becomes the .dynstr
538 struct elf_strtab_hash *dynstr;
540 /* The number of symbol strings found in the link which must be put
541 into the .strtab section. */
542 bfd_size_type strtabcount;
544 /* The array size of the symbol string table, which becomes the
546 bfd_size_type strtabsize;
548 /* The array of strings, which becomes the .strtab section. */
549 struct elf_sym_strtab *strtab;
551 /* The number of buckets in the hash table in the .hash section.
552 This is based on the number of dynamic symbols. */
553 bfd_size_type bucketcount;
555 /* A linked list of DT_NEEDED names found in dynamic objects
556 included in the link. */
557 struct bfd_link_needed_list *needed;
559 /* Sections in the output bfd that provides a section symbol
560 to be used by relocations emitted against local symbols.
561 Most targets will not use data_index_section. */
562 asection *text_index_section;
563 asection *data_index_section;
565 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
566 struct elf_link_hash_entry *hgot;
568 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
569 struct elf_link_hash_entry *hplt;
571 /* The _DYNAMIC symbol. */
572 struct elf_link_hash_entry *hdynamic;
574 /* A pointer to information used to merge SEC_MERGE sections. */
577 /* Used to link stabs in sections. */
578 struct stab_info stab_info;
580 /* Used by eh_frame code when editing .eh_frame. */
581 struct eh_frame_hdr_info eh_info;
583 /* A linked list of local symbols to be added to .dynsym. */
584 struct elf_link_local_dynamic_entry *dynlocal;
586 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
587 objects included in the link. */
588 struct bfd_link_needed_list *runpath;
590 /* Cached first output tls section and size of PT_TLS segment. */
592 bfd_size_type tls_size;
594 /* A linked list of BFD's loaded in the link. */
595 struct elf_link_loaded_list *loaded;
597 /* Short-cuts to get to dynamic linker sections. */
606 asection *sreldynrelro;
614 /* Look up an entry in an ELF linker hash table. */
616 #define elf_link_hash_lookup(table, string, create, copy, follow) \
617 ((struct elf_link_hash_entry *) \
618 bfd_link_hash_lookup (&(table)->root, (string), (create), \
621 /* Traverse an ELF linker hash table. */
623 #define elf_link_hash_traverse(table, func, info) \
624 (bfd_link_hash_traverse \
626 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
629 /* Get the ELF linker hash table from a link_info structure. */
631 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
633 #define elf_hash_table_id(table) ((table) -> hash_table_id)
635 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
636 #define is_elf_hash_table(htab) \
637 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
639 /* Used by bfd_sym_from_r_symndx to cache a small number of local
641 #define LOCAL_SYM_CACHE_SIZE 32
645 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
646 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
649 /* Constant information held for an ELF backend. */
651 struct elf_size_info {
652 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
653 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
655 /* The size of entries in the .hash section. */
656 unsigned char sizeof_hash_entry;
658 /* The number of internal relocations to allocate per external
660 unsigned char int_rels_per_ext_rel;
661 /* We use some fixed size arrays. This should be large enough to
662 handle all back-ends. */
663 #define MAX_INT_RELS_PER_EXT_REL 3
665 unsigned char arch_size, log_file_align;
666 unsigned char elfclass, ev_current;
667 int (*write_out_phdrs)
668 (bfd *, const Elf_Internal_Phdr *, unsigned int);
670 (*write_shdrs_and_ehdr) (bfd *);
671 bfd_boolean (*checksum_contents)
672 (bfd * , void (*) (const void *, size_t, void *), void *);
674 (bfd *, asection *, void *);
675 bfd_boolean (*swap_symbol_in)
676 (bfd *, const void *, const void *, Elf_Internal_Sym *);
677 void (*swap_symbol_out)
678 (bfd *, const Elf_Internal_Sym *, void *, void *);
679 bfd_boolean (*slurp_reloc_table)
680 (bfd *, asection *, asymbol **, bfd_boolean);
681 long (*slurp_symbol_table)
682 (bfd *, asymbol **, bfd_boolean);
684 (bfd *, const void *, Elf_Internal_Dyn *);
686 (bfd *, const Elf_Internal_Dyn *, void *);
688 /* This function is called to swap in a REL relocation. If an
689 external relocation corresponds to more than one internal
690 relocation, then all relocations are swapped in at once. */
691 void (*swap_reloc_in)
692 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
694 /* This function is called to swap out a REL relocation. */
695 void (*swap_reloc_out)
696 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
698 /* This function is called to swap in a RELA relocation. If an
699 external relocation corresponds to more than one internal
700 relocation, then all relocations are swapped in at once. */
701 void (*swap_reloca_in)
702 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
704 /* This function is called to swap out a RELA relocation. */
705 void (*swap_reloca_out)
706 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
709 #define elf_symbol_from(ABFD,S) \
710 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
711 && (S)->the_bfd->tdata.elf_obj_data != 0) \
712 ? (elf_symbol_type *) (S) \
715 enum elf_reloc_type_class {
717 reloc_class_relative,
723 struct elf_reloc_cookie
725 Elf_Internal_Rela *rels, *rel, *relend;
726 Elf_Internal_Sym *locsyms;
730 struct elf_link_hash_entry **sym_hashes;
732 bfd_boolean bad_symtab;
735 /* The level of IRIX compatibility we're striving for. */
743 /* Mapping of ELF section names and types. */
744 struct bfd_elf_special_section
747 unsigned int prefix_length;
748 /* 0 means name must match PREFIX exactly.
749 -1 means name must start with PREFIX followed by an arbitrary string.
750 -2 means name must match PREFIX exactly or consist of PREFIX followed
751 by a dot then anything.
752 > 0 means name must start with the first PREFIX_LENGTH chars of
753 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
754 signed int suffix_length;
759 enum action_discarded
765 typedef asection * (*elf_gc_mark_hook_fn)
766 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
767 struct elf_link_hash_entry *, Elf_Internal_Sym *);
769 enum elf_property_kind
771 /* A new property. */
772 property_unknown = 0,
773 /* A property ignored by backend. */
775 /* A corrupt property reported by backend. */
777 /* A property should be removed due to property merge. */
779 /* A property which is a number. */
783 typedef struct elf_property
785 unsigned int pr_type;
786 unsigned int pr_datasz;
789 /* For property_number, this is a number. */
791 /* Add a new one if elf_property_kind is updated. */
793 enum elf_property_kind pr_kind;
796 typedef struct elf_property_list
798 struct elf_property_list *next;
799 struct elf_property property;
802 struct bfd_elf_section_reloc_data;
804 struct elf_backend_data
806 /* The architecture for this backend. */
807 enum bfd_architecture arch;
809 /* An identifier used to distinguish different target specific
810 extensions to elf_obj_tdata and elf_link_hash_table structures. */
811 enum elf_target_id target_id;
813 /* The ELF machine code (EM_xxxx) for this backend. */
814 int elf_machine_code;
819 /* The maximum page size for this backend. */
822 /* The minimum page size for this backend. An input object will not be
823 considered page aligned unless its sections are correctly aligned for
824 pages at least this large. May be smaller than maxpagesize. */
827 /* The common page size for this backend. */
828 bfd_vma commonpagesize;
830 /* The BFD flags applied to sections created for dynamic linking. */
831 flagword dynamic_sec_flags;
833 /* Architecture-specific data for this backend.
834 This is actually a pointer to some type like struct elf_ARCH_data. */
835 const void *arch_data;
837 /* A function to translate an ELF RELA relocation to a BFD arelent
839 void (*elf_info_to_howto)
840 (bfd *, arelent *, Elf_Internal_Rela *);
842 /* A function to translate an ELF REL relocation to a BFD arelent
844 void (*elf_info_to_howto_rel)
845 (bfd *, arelent *, Elf_Internal_Rela *);
847 /* A function to determine whether a symbol is global when
848 partitioning the symbol table into local and global symbols.
849 This should be NULL for most targets, in which case the correct
850 thing will be done. MIPS ELF, at least on the Irix 5, has
851 special requirements. */
852 bfd_boolean (*elf_backend_sym_is_global)
855 /* The remaining functions are hooks which are called only if they
858 /* A function to permit a backend specific check on whether a
859 particular BFD format is relevant for an object file, and to
860 permit the backend to set any global information it wishes. When
861 this is called elf_elfheader is set, but anything else should be
862 used with caution. If this returns FALSE, the check_format
863 routine will return a bfd_error_wrong_format error. */
864 bfd_boolean (*elf_backend_object_p)
867 /* A function to do additional symbol processing when reading the
868 ELF symbol table. This is where any processor-specific special
869 section indices are handled. */
870 void (*elf_backend_symbol_processing)
873 /* A function to do additional symbol processing after reading the
874 entire ELF symbol table. */
875 bfd_boolean (*elf_backend_symbol_table_processing)
876 (bfd *, elf_symbol_type *, unsigned int);
878 /* A function to set the type of the info field. Processor-specific
879 types should be handled here. */
880 int (*elf_backend_get_symbol_type)
881 (Elf_Internal_Sym *, int);
883 /* A function to return the linker hash table entry of a symbol that
884 might be satisfied by an archive symbol. */
885 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
886 (bfd *, struct bfd_link_info *, const char *);
888 /* Return true if local section symbols should have a non-null st_name.
889 NULL implies false. */
890 bfd_boolean (*elf_backend_name_local_section_symbols)
893 /* A function to do additional processing on the ELF section header
894 just before writing it out. This is used to set the flags and
895 type fields for some sections, or to actually write out data for
897 bfd_boolean (*elf_backend_section_processing)
898 (bfd *, Elf_Internal_Shdr *);
900 /* A function to handle unusual section types when creating BFD
901 sections from ELF sections. */
902 bfd_boolean (*elf_backend_section_from_shdr)
903 (bfd *, Elf_Internal_Shdr *, const char *, int);
905 /* A function to convert machine dependent ELF section header flags to
906 BFD internal section header flags. */
907 bfd_boolean (*elf_backend_section_flags)
908 (flagword *, const Elf_Internal_Shdr *);
910 /* A function that returns a struct containing ELF section flags and
911 type for the given BFD section. */
912 const struct bfd_elf_special_section * (*get_sec_type_attr)
915 /* A function to handle unusual program segment types when creating BFD
916 sections from ELF program segments. */
917 bfd_boolean (*elf_backend_section_from_phdr)
918 (bfd *, Elf_Internal_Phdr *, int, const char *);
920 /* A function to set up the ELF section header for a BFD section in
921 preparation for writing it out. This is where the flags and type
922 fields are set for unusual sections. */
923 bfd_boolean (*elf_backend_fake_sections)
924 (bfd *, Elf_Internal_Shdr *, asection *);
926 /* A function to get the ELF section index for a BFD section. If
927 this returns TRUE, the section was found. If it is a normal ELF
928 section, *RETVAL should be left unchanged. If it is not a normal
929 ELF section *RETVAL should be set to the SHN_xxxx index. */
930 bfd_boolean (*elf_backend_section_from_bfd_section)
931 (bfd *, asection *, int *retval);
933 /* If this field is not NULL, it is called by the add_symbols phase
934 of a link just before adding a symbol to the global linker hash
935 table. It may modify any of the fields as it wishes. If *NAME
936 is set to NULL, the symbol will be skipped rather than being
937 added to the hash table. This function is responsible for
938 handling all processor dependent symbol bindings and section
939 indices, and must set at least *FLAGS and *SEC for each processor
940 dependent case; failure to do so will cause a link error. */
941 bfd_boolean (*elf_add_symbol_hook)
942 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
943 const char **name, flagword *flags, asection **sec, bfd_vma *value);
945 /* If this field is not NULL, it is called by the elf_link_output_sym
946 phase of a link for each symbol which will appear in the object file.
947 On error, this function returns 0. 1 is returned when the symbol
948 should be output, 2 is returned when the symbol should be discarded. */
949 int (*elf_backend_link_output_symbol_hook)
950 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
951 asection *, struct elf_link_hash_entry *);
953 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
954 linker the first time it encounters a dynamic object in the link.
955 This function must create any sections required for dynamic
956 linking. The ABFD argument is a dynamic object. The .interp,
957 .dynamic, .dynsym, .dynstr, and .hash functions have already been
958 created, and this function may modify the section flags if
959 desired. This function will normally create the .got and .plt
960 sections, but different backends have different requirements. */
961 bfd_boolean (*elf_backend_create_dynamic_sections)
962 (bfd *abfd, struct bfd_link_info *info);
964 /* When creating a shared library, determine whether to omit the
965 dynamic symbol for the section. */
966 bfd_boolean (*elf_backend_omit_section_dynsym)
967 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
969 /* Return TRUE if relocations of targets are compatible to the extent
970 that CHECK_RELOCS will properly process them. PR 4424. */
971 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
973 /* The CHECK_RELOCS function is called by the add_symbols phase of
974 the ELF backend linker. It is called once for each section with
975 relocs of an object file, just after the symbols for the object
976 file have been added to the global linker hash table. The
977 function must look through the relocs and do any special handling
978 required. This generally means allocating space in the global
979 offset table, and perhaps allocating space for a reloc. The
980 relocs are always passed as Rela structures; if the section
981 actually uses Rel structures, the r_addend field will always be
983 bfd_boolean (*check_relocs)
984 (bfd *abfd, struct bfd_link_info *info, asection *o,
985 const Elf_Internal_Rela *relocs);
987 /* The CHECK_DIRECTIVES function is called once per input file by
988 the add_symbols phase of the ELF backend linker. The function
989 must inspect the bfd and create any additional symbols according
990 to any custom directives in the bfd. */
991 bfd_boolean (*check_directives)
992 (bfd *abfd, struct bfd_link_info *info);
994 /* The NOTICE_AS_NEEDED function is called as the linker is about to
995 handle an as-needed lib (ACT = notice_as_needed), and after the
996 linker has decided to keep the lib (ACT = notice_needed) or when
997 the lib is not needed (ACT = notice_not_needed). */
998 bfd_boolean (*notice_as_needed)
999 (bfd *abfd, struct bfd_link_info *info, enum notice_asneeded_action act);
1001 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
1002 linker for every symbol which is defined by a dynamic object and
1003 referenced by a regular object. This is called after all the
1004 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
1005 function has been called. The hash table entry should be
1006 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
1007 defined in a section from a dynamic object. Dynamic object
1008 sections are not included in the final link, and this function is
1009 responsible for changing the value to something which the rest of
1010 the link can deal with. This will normally involve adding an
1011 entry to the .plt or .got or some such section, and setting the
1012 symbol to point to that. */
1013 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
1014 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
1016 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
1017 after all the linker input files have been seen but before the
1018 section sizes have been set. This is called after
1019 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
1020 bfd_boolean (*elf_backend_always_size_sections)
1021 (bfd *output_bfd, struct bfd_link_info *info);
1023 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
1024 linker after all the linker input files have been seen but before
1025 the sections sizes have been set. This is called after
1026 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
1027 It is only called when linking against a dynamic object. It must
1028 set the sizes of the dynamic sections, and may fill in their
1029 contents as well. The generic ELF linker can handle the .dynsym,
1030 .dynstr and .hash sections. This function must handle the
1031 .interp section and any sections created by the
1032 CREATE_DYNAMIC_SECTIONS entry point. */
1033 bfd_boolean (*elf_backend_size_dynamic_sections)
1034 (bfd *output_bfd, struct bfd_link_info *info);
1036 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
1037 we keep to use as a base for relocs and symbols. */
1038 void (*elf_backend_init_index_section)
1039 (bfd *output_bfd, struct bfd_link_info *info);
1041 /* The RELOCATE_SECTION function is called by the ELF backend linker
1042 to handle the relocations for a section.
1044 The relocs are always passed as Rela structures; if the section
1045 actually uses Rel structures, the r_addend field will always be
1048 This function is responsible for adjust the section contents as
1049 necessary, and (if using Rela relocs and generating a
1050 relocatable output file) adjusting the reloc addend as
1053 This function does not have to worry about setting the reloc
1054 address or the reloc symbol index.
1056 LOCAL_SYMS is a pointer to the swapped in local symbols.
1058 LOCAL_SECTIONS is an array giving the section in the input file
1059 corresponding to the st_shndx field of each local symbol.
1061 The global hash table entry for the global symbols can be found
1062 via elf_sym_hashes (input_bfd).
1064 When generating relocatable output, this function must handle
1065 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1066 going to be the section symbol corresponding to the output
1067 section, which means that the addend must be adjusted
1070 Returns FALSE on error, TRUE on success, 2 if successful and
1071 relocations should be written for this section. */
1072 int (*elf_backend_relocate_section)
1073 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
1074 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
1075 Elf_Internal_Sym *local_syms, asection **local_sections);
1077 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
1078 linker just before it writes a symbol out to the .dynsym section.
1079 The processor backend may make any required adjustment to the
1080 symbol. It may also take the opportunity to set contents of the
1081 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
1082 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
1083 on those symbols which are defined by a dynamic object. */
1084 bfd_boolean (*elf_backend_finish_dynamic_symbol)
1085 (bfd *output_bfd, struct bfd_link_info *info,
1086 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
1088 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
1089 linker just before it writes all the dynamic sections out to the
1090 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
1091 all dynamic symbols. */
1092 bfd_boolean (*elf_backend_finish_dynamic_sections)
1093 (bfd *output_bfd, struct bfd_link_info *info);
1095 /* A function to do any beginning processing needed for the ELF file
1096 before building the ELF headers and computing file positions. */
1097 void (*elf_backend_begin_write_processing)
1098 (bfd *, struct bfd_link_info *);
1100 /* A function to do any final processing needed for the ELF file
1101 before writing it out. The LINKER argument is TRUE if this BFD
1102 was created by the ELF backend linker. */
1103 void (*elf_backend_final_write_processing)
1104 (bfd *, bfd_boolean linker);
1106 /* This function is called by get_program_header_size. It should
1107 return the number of additional program segments which this BFD
1108 will need. It should return -1 on error. */
1109 int (*elf_backend_additional_program_headers)
1110 (bfd *, struct bfd_link_info *);
1112 /* This function is called to modify an existing segment map in a
1113 backend specific fashion. */
1114 bfd_boolean (*elf_backend_modify_segment_map)
1115 (bfd *, struct bfd_link_info *);
1117 /* This function is called to modify program headers just before
1118 they are written. */
1119 bfd_boolean (*elf_backend_modify_program_headers)
1120 (bfd *, struct bfd_link_info *);
1122 /* This function is called to see if the PHDR header should be
1123 checked for validity. */
1124 bfd_boolean (*elf_backend_allow_non_load_phdr)
1125 (bfd *, const Elf_Internal_Phdr *, unsigned);
1127 /* This function is called before section garbage collection to
1128 mark entry symbol sections. */
1130 (struct bfd_link_info *);
1132 /* This function is called during section garbage collection to
1133 mark sections that define global symbols. */
1134 bfd_boolean (*gc_mark_dynamic_ref)
1135 (struct elf_link_hash_entry *, void *);
1137 /* This function is called during section gc to discover the section a
1138 particular relocation refers to. */
1139 elf_gc_mark_hook_fn gc_mark_hook;
1141 /* This function, if defined, is called after the first gc marking pass
1142 to allow the backend to mark additional sections. */
1143 bfd_boolean (*gc_mark_extra_sections)
1144 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1146 /* This function, if defined, is called during the sweep phase of gc
1147 in order that a backend might update any data structures it might
1149 bfd_boolean (*gc_sweep_hook)
1150 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1152 /* This function, if defined, is called after the ELF headers have
1153 been created. This allows for things like the OS and ABI versions
1155 void (*elf_backend_post_process_headers)
1156 (bfd *, struct bfd_link_info *);
1158 /* This function, if defined, prints a symbol to file and returns the
1159 name of the symbol to be printed. It should return NULL to fall
1160 back to default symbol printing. */
1161 const char *(*elf_backend_print_symbol_all)
1162 (bfd *, void *, asymbol *);
1164 /* This function, if defined, is called after all local symbols and
1165 global symbols converted to locals are emitted into the symtab
1166 section. It allows the backend to emit special local symbols
1167 not handled in the hash table. */
1168 bfd_boolean (*elf_backend_output_arch_local_syms)
1169 (bfd *, struct bfd_link_info *, void *,
1170 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1171 struct elf_link_hash_entry *));
1173 /* This function, if defined, is called after all symbols are emitted
1174 into the symtab section. It allows the backend to emit special
1175 global symbols not handled in the hash table. */
1176 bfd_boolean (*elf_backend_output_arch_syms)
1177 (bfd *, struct bfd_link_info *, void *,
1178 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1179 struct elf_link_hash_entry *));
1181 /* Filter what symbols of the output file to include in the import
1182 library if one is created. */
1183 unsigned int (*elf_backend_filter_implib_symbols)
1184 (bfd *, struct bfd_link_info *, asymbol **, long);
1186 /* Copy any information related to dynamic linking from a pre-existing
1187 symbol to a newly created symbol. Also called to copy flags and
1188 other back-end info to a weakdef, in which case the symbol is not
1189 newly created and plt/got refcounts and dynamic indices should not
1191 void (*elf_backend_copy_indirect_symbol)
1192 (struct bfd_link_info *, struct elf_link_hash_entry *,
1193 struct elf_link_hash_entry *);
1195 /* Modify any information related to dynamic linking such that the
1196 symbol is not exported. */
1197 void (*elf_backend_hide_symbol)
1198 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1200 /* A function to do additional symbol fixup, called by
1201 _bfd_elf_fix_symbol_flags. */
1202 bfd_boolean (*elf_backend_fixup_symbol)
1203 (struct bfd_link_info *, struct elf_link_hash_entry *);
1205 /* Merge the backend specific symbol attribute. */
1206 void (*elf_backend_merge_symbol_attribute)
1207 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1210 /* This function, if defined, will return a string containing the
1211 name of a target-specific dynamic tag. */
1212 char *(*elf_backend_get_target_dtag)
1215 /* Decide whether an undefined symbol is special and can be ignored.
1216 This is the case for OPTIONAL symbols on IRIX. */
1217 bfd_boolean (*elf_backend_ignore_undef_symbol)
1218 (struct elf_link_hash_entry *);
1220 /* Emit relocations. Overrides default routine for emitting relocs,
1221 except during a relocatable link, or if all relocs are being emitted. */
1222 bfd_boolean (*elf_backend_emit_relocs)
1223 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1224 struct elf_link_hash_entry **);
1226 /* Update relocations. It is allowed to change the number and the order.
1227 In such a case hashes should be invalidated. */
1228 void (*elf_backend_update_relocs)
1229 (asection *, struct bfd_elf_section_reloc_data *);
1231 /* Count relocations. Not called for relocatable links
1232 or if all relocs are being preserved in the output. */
1233 unsigned int (*elf_backend_count_relocs)
1234 (struct bfd_link_info *, asection *);
1236 /* Count additionals relocations. Called for relocatable links if
1237 additional relocations needs to be created. */
1238 unsigned int (*elf_backend_count_additional_relocs)
1241 /* Say whether to sort relocs output by ld -r and ld --emit-relocs,
1242 by r_offset. If NULL, default to true. */
1243 bfd_boolean (*sort_relocs_p)
1246 /* This function, if defined, is called when an NT_PRSTATUS note is found
1248 bfd_boolean (*elf_backend_grok_prstatus)
1249 (bfd *, Elf_Internal_Note *);
1251 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1252 note is found in a core file. */
1253 bfd_boolean (*elf_backend_grok_psinfo)
1254 (bfd *, Elf_Internal_Note *);
1256 /* This function, if defined, is called to write a note to a corefile. */
1257 char *(*elf_backend_write_core_note)
1258 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1260 /* This function, if defined, is called to convert target-specific
1261 section flag names into hex values. */
1262 flagword (*elf_backend_lookup_section_flags_hook)
1265 /* This function returns class of a reloc type. */
1266 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1267 (const struct bfd_link_info *, const asection *, const Elf_Internal_Rela *);
1269 /* This function, if defined, removes information about discarded functions
1270 from other sections which mention them. */
1271 bfd_boolean (*elf_backend_discard_info)
1272 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1274 /* This function, if defined, signals that the function above has removed
1275 the discarded relocations for this section. */
1276 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1279 /* What to do when ld finds relocations against symbols defined in
1280 discarded sections. */
1281 unsigned int (*action_discarded)
1284 /* This function returns the width of FDE pointers in bytes, or 0 if
1285 that can't be determined for some reason. The default definition
1286 goes by the bfd's EI_CLASS. */
1287 unsigned int (*elf_backend_eh_frame_address_size)
1288 (bfd *, asection *);
1290 /* These functions tell elf-eh-frame whether to attempt to turn
1291 absolute or lsda encodings into pc-relative ones. The default
1292 definition enables these transformations. */
1293 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1294 (bfd *, struct bfd_link_info *, asection *);
1295 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1296 (bfd *, struct bfd_link_info *, asection *);
1298 /* This function returns an encoding after computing the encoded
1299 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1300 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1301 The default definition chooses a 32-bit PC-relative encoding. */
1302 bfd_byte (*elf_backend_encode_eh_address)
1303 (bfd *abfd, struct bfd_link_info *info,
1304 asection *osec, bfd_vma offset,
1305 asection *loc_sec, bfd_vma loc_offset,
1308 /* This function, if defined, may write out the given section.
1309 Returns TRUE if it did so and FALSE if the caller should. */
1310 bfd_boolean (*elf_backend_write_section)
1311 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1313 /* The level of IRIX compatibility we're striving for.
1314 MIPS ELF specific function. */
1315 irix_compat_t (*elf_backend_mips_irix_compat)
1318 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1319 (unsigned int, bfd_boolean);
1321 /* The swapping table to use when dealing with ECOFF information.
1322 Used for the MIPS ELF .mdebug section. */
1323 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1325 /* This function implements `bfd_elf_bfd_from_remote_memory';
1326 see elf.c, elfcode.h. */
1327 bfd *(*elf_backend_bfd_from_remote_memory)
1328 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
1329 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1330 bfd_size_type len));
1332 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1334 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1336 /* Is symbol defined in common section? */
1337 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1339 /* Return a common section index for section. */
1340 unsigned int (*common_section_index) (asection *);
1342 /* Return a common section for section. */
1343 asection *(*common_section) (asection *);
1345 /* Return TRUE if we can merge 2 definitions. */
1346 bfd_boolean (*merge_symbol) (struct elf_link_hash_entry *,
1347 const Elf_Internal_Sym *, asection **,
1348 bfd_boolean, bfd_boolean,
1349 bfd *, const asection *);
1351 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1352 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1354 /* Return TRUE if type is a function symbol type. */
1355 bfd_boolean (*is_function_type) (unsigned int type);
1357 /* If the ELF symbol SYM might be a function in SEC, return the
1358 function size and set *CODE_OFF to the function's entry point,
1359 otherwise return zero. */
1360 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1363 /* Return the section which RELOC_SEC applies to. */
1364 asection *(*get_reloc_section) (asection *reloc_sec);
1366 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
1367 has a type >= SHT_LOOS. Returns TRUE if the fields were initialised,
1368 FALSE otherwise. Can be called multiple times for a given section,
1369 until it returns TRUE. Most of the times it is called ISECTION will be
1370 set to an input section that might be associated with the output section.
1371 The last time that it is called, ISECTION will be set to NULL. */
1372 bfd_boolean (*elf_backend_copy_special_section_fields)
1373 (const bfd *ibfd, bfd *obfd, const Elf_Internal_Shdr *isection,
1374 Elf_Internal_Shdr *osection);
1376 /* Used to handle bad SHF_LINK_ORDER input. */
1377 void (*link_order_error_handler) (const char *, ...);
1379 /* Name of the PLT relocation section. */
1380 const char *relplt_name;
1382 /* Alternate EM_xxxx machine codes for this backend. */
1383 int elf_machine_alt1;
1384 int elf_machine_alt2;
1386 const struct elf_size_info *s;
1388 /* An array of target specific special sections. */
1389 const struct bfd_elf_special_section *special_sections;
1391 /* The size in bytes of the header for the GOT. This includes the
1392 so-called reserved entries on some systems. */
1393 bfd_vma got_header_size;
1395 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1396 otherwise by the local symbol with index SYMNDX in IBFD. */
1397 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1398 struct elf_link_hash_entry *h,
1399 bfd *ibfd, unsigned long symndx);
1401 /* The vendor name to use for a processor-standard attributes section. */
1402 const char *obj_attrs_vendor;
1404 /* The section name to use for a processor-standard attributes section. */
1405 const char *obj_attrs_section;
1407 /* Return 1, 2 or 3 to indicate what type of arguments a
1408 processor-specific tag takes. */
1409 int (*obj_attrs_arg_type) (int);
1411 /* The section type to use for an attributes section. */
1412 unsigned int obj_attrs_section_type;
1414 /* This function determines the order in which any attributes are
1415 written. It must be defined for input in the range
1416 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1417 is used in order to make unity easy). The returned value is the
1418 actual tag number to place in the input position. */
1419 int (*obj_attrs_order) (int);
1421 /* Handle merging unknown attributes; either warn and return TRUE,
1422 or give an error and return FALSE. */
1423 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1425 /* Parse GNU properties. Return the property kind. If the property
1426 is corrupt, issue an error message and return property_corrupt. */
1427 enum elf_property_kind (*parse_gnu_properties) (bfd *, unsigned int,
1431 /* Merge GNU properties. Return TRUE if property is updated. */
1432 bfd_boolean (*merge_gnu_properties) (bfd *, elf_property *,
1435 /* Set up GNU properties. */
1436 void (*setup_gnu_properties) (struct bfd_link_info *);
1438 /* Encoding used for compact EH tables. */
1439 int (*compact_eh_encoding) (struct bfd_link_info *);
1441 /* Opcode representing no unwind. */
1442 int (*cant_unwind_opcode) (struct bfd_link_info *);
1444 /* This is non-zero if static TLS segments require a special alignment. */
1445 unsigned static_tls_alignment;
1447 /* Alignment for the PT_GNU_STACK segment. */
1448 unsigned stack_align;
1450 /* Flag bits to assign to a section of type SHT_STRTAB. */
1451 unsigned long elf_strtab_flags;
1453 /* This is TRUE if the linker should act like collect and gather
1454 global constructors and destructors by name. This is TRUE for
1455 MIPS ELF because the Irix 5 tools can not handle the .init
1457 unsigned collect : 1;
1459 /* This is TRUE if the linker should ignore changes to the type of a
1460 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1461 record undefined functions as STT_OBJECT although the definitions
1463 unsigned type_change_ok : 1;
1465 /* Whether the backend may use REL relocations. (Some backends use
1466 both REL and RELA relocations, and this flag is set for those
1468 unsigned may_use_rel_p : 1;
1470 /* Whether the backend may use RELA relocations. (Some backends use
1471 both REL and RELA relocations, and this flag is set for those
1473 unsigned may_use_rela_p : 1;
1475 /* Whether the default relocation type is RELA. If a backend with
1476 this flag set wants REL relocations for a particular section,
1477 it must note that explicitly. Similarly, if this flag is clear,
1478 and the backend wants RELA relocations for a particular
1480 unsigned default_use_rela_p : 1;
1482 /* True if PLT and copy relocations should be RELA by default. */
1483 unsigned rela_plts_and_copies_p : 1;
1485 /* Set if RELA relocations for a relocatable link can be handled by
1486 generic code. Backends that set this flag need do nothing in the
1487 backend relocate_section routine for relocatable linking. */
1488 unsigned rela_normal : 1;
1490 /* Set if DT_REL/DT_RELA/DT_RELSZ/DT_RELASZ should not include PLT
1492 unsigned dtrel_excludes_plt : 1;
1494 /* TRUE if addresses "naturally" sign extend. This is used when
1495 swapping in from Elf32 when BFD64. */
1496 unsigned sign_extend_vma : 1;
1498 unsigned want_got_plt : 1;
1499 unsigned plt_readonly : 1;
1500 unsigned want_plt_sym : 1;
1501 unsigned plt_not_loaded : 1;
1502 unsigned plt_alignment : 4;
1503 unsigned can_gc_sections : 1;
1504 unsigned can_refcount : 1;
1505 unsigned want_got_sym : 1;
1506 unsigned want_dynbss : 1;
1507 unsigned want_dynrelro : 1;
1509 /* Targets which do not support physical addressing often require
1510 that the p_paddr field in the section header to be set to zero.
1511 This field indicates whether this behavior is required. */
1512 unsigned want_p_paddr_set_to_zero : 1;
1514 /* Target has broken hardware and/or kernel that requires pages not
1515 to be mapped twice with different permissions. */
1516 unsigned no_page_alias : 1;
1518 /* True if an object file lacking a .note.GNU-stack section
1519 should be assumed to be requesting exec stack. At least one
1520 other file in the link needs to have a .note.GNU-stack section
1521 for a PT_GNU_STACK segment to be created. */
1522 unsigned default_execstack : 1;
1524 /* True if elf_section_data(sec)->this_hdr.contents is sec->rawsize
1525 in length rather than sec->size in length, if sec->rawsize is
1526 non-zero and smaller than sec->size. */
1527 unsigned caches_rawsize : 1;
1529 /* Address of protected data defined in the shared library may be
1530 external, i.e., due to copy relocation. */
1531 unsigned extern_protected_data : 1;
1534 /* Information about reloc sections associated with a bfd_elf_section_data
1536 struct bfd_elf_section_reloc_data
1538 /* The ELF header for the reloc section associated with this
1540 Elf_Internal_Shdr *hdr;
1541 /* The number of relocations currently assigned to HDR. */
1543 /* The ELF section number of the reloc section. Only used for an
1546 /* Used by the backend linker to store the symbol hash table entries
1547 associated with relocs against global symbols. */
1548 struct elf_link_hash_entry **hashes;
1551 /* Information stored for each BFD section in an ELF file. This
1552 structure is allocated by elf_new_section_hook. */
1554 struct bfd_elf_section_data
1556 /* The ELF header for this section. */
1557 Elf_Internal_Shdr this_hdr;
1559 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1560 struct flag_info *section_flag_info;
1562 /* Information about the REL and RELA reloc sections associated
1563 with this section, if any. */
1564 struct bfd_elf_section_reloc_data rel, rela;
1566 /* The ELF section number of this section. */
1569 /* Used by the backend linker when generating a shared library to
1570 record the dynamic symbol index for a section symbol
1571 corresponding to this section. A value of 0 means that there is
1572 no dynamic symbol for this section. */
1575 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1576 asection *linked_to;
1578 /* A pointer to the swapped relocs. If the section uses REL relocs,
1579 rather than RELA, all the r_addend fields will be zero. This
1580 pointer may be NULL. It is used by the backend linker. */
1581 Elf_Internal_Rela *relocs;
1583 /* A pointer to a linked list tracking dynamic relocs copied for
1587 /* A pointer to the bfd section used for dynamic relocs. */
1591 /* Group name, if this section is a member of a group. */
1594 /* Group signature sym, if this is the SHT_GROUP section. */
1595 struct bfd_symbol *id;
1598 /* For a member of a group, points to the SHT_GROUP section.
1599 NULL for the SHT_GROUP section itself and non-group sections. */
1600 asection *sec_group;
1602 /* A linked list of member sections in the group. Circular when used by
1603 the linker. For the SHT_GROUP section, points at first member. */
1604 asection *next_in_group;
1606 /* The FDEs associated with this section. The u.fde.next_in_section
1607 field acts as a chain pointer. */
1608 struct eh_cie_fde *fde_list;
1610 /* Link from a text section to its .eh_frame_entry section. */
1611 asection *eh_frame_entry;
1613 /* A pointer used for various section optimizations. */
1617 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1618 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1619 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1620 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1621 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1622 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1623 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1624 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1625 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1626 #define elf_section_eh_frame_entry(sec) (elf_section_data(sec)->eh_frame_entry)
1628 #define xvec_get_elf_backend_data(xvec) \
1629 ((const struct elf_backend_data *) (xvec)->backend_data)
1631 #define get_elf_backend_data(abfd) \
1632 xvec_get_elf_backend_data ((abfd)->xvec)
1634 /* The least object attributes (within an attributes subsection) known
1635 for any target. Some code assumes that the value 0 is not used and
1636 the field for that attribute can instead be used as a marker to
1637 indicate that attributes have been initialized. */
1638 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1640 /* The maximum number of known object attributes for any target. */
1641 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1643 /* The value of an object attribute. The type indicates whether the attribute
1644 holds and integer, a string, or both. It can also indicate that there can
1645 be no default (i.e. all values must be written to file, even zero). */
1647 typedef struct obj_attribute
1649 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1650 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1651 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1653 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1654 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1655 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1662 typedef struct obj_attribute_list
1664 struct obj_attribute_list *next;
1667 } obj_attribute_list;
1669 /* Object attributes may either be defined by the processor ABI, index
1670 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1671 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1672 #define OBJ_ATTR_PROC 0
1673 #define OBJ_ATTR_GNU 1
1674 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1675 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1677 /* The following object attribute tags are taken as generic, for all
1678 targets and for "gnu" where there is no target standard. */
1685 Tag_compatibility = 32
1688 /* The following struct stores information about every SystemTap section
1689 found in the object file. */
1692 struct sdt_note *next;
1697 /* tdata information grabbed from an elf core file. */
1698 struct core_elf_obj_tdata
1707 /* Extra tdata information held for output ELF BFDs. */
1708 struct output_elf_obj_tdata
1710 struct elf_segment_map *seg_map;
1711 struct elf_strtab_hash *strtab_ptr;
1713 /* STT_SECTION symbols for each section */
1714 asymbol **section_syms;
1716 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1718 asection *eh_frame_hdr;
1720 /* NT_GNU_BUILD_ID note type info. */
1723 bfd_boolean (*after_write_object_contents) (bfd *);
1728 /* Records the result of `get_program_header_size'. */
1729 bfd_size_type program_header_size;
1731 /* Used when laying out sections. */
1732 file_ptr next_file_pos;
1734 int num_section_syms;
1735 unsigned int shstrtab_section, strtab_section;
1737 /* Segment flags for the PT_GNU_STACK segment. */
1738 unsigned int stack_flags;
1740 /* This is set to TRUE if the object was created by the backend
1744 /* Used to determine if the e_flags field has been initialized */
1745 bfd_boolean flags_init;
1748 /* Indicate if the bfd contains symbols that have the STT_GNU_IFUNC
1749 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1750 field in the ELF header structure. */
1751 enum elf_gnu_symbols
1753 elf_gnu_symbol_none = 0,
1754 elf_gnu_symbol_any = 1 << 0,
1755 elf_gnu_symbol_ifunc = (elf_gnu_symbol_any | 1 << 1),
1756 elf_gnu_symbol_unique = (elf_gnu_symbol_any | 1 << 2),
1757 elf_gnu_symbol_all = (elf_gnu_symbol_ifunc | elf_gnu_symbol_unique)
1760 typedef struct elf_section_list
1762 Elf_Internal_Shdr hdr;
1764 struct elf_section_list * next;
1767 /* Some private data is stashed away for future use using the tdata pointer
1768 in the bfd structure. */
1770 struct elf_obj_tdata
1772 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1773 Elf_Internal_Shdr **elf_sect_ptr;
1774 Elf_Internal_Phdr *phdr;
1775 Elf_Internal_Shdr symtab_hdr;
1776 Elf_Internal_Shdr shstrtab_hdr;
1777 Elf_Internal_Shdr strtab_hdr;
1778 Elf_Internal_Shdr dynsymtab_hdr;
1779 Elf_Internal_Shdr dynstrtab_hdr;
1780 Elf_Internal_Shdr dynversym_hdr;
1781 Elf_Internal_Shdr dynverref_hdr;
1782 Elf_Internal_Shdr dynverdef_hdr;
1783 elf_section_list * symtab_shndx_list;
1784 bfd_vma gp; /* The gp value */
1785 unsigned int gp_size; /* The gp size */
1786 unsigned int num_elf_sections; /* elf_sect_ptr size */
1788 /* A mapping from external symbols to entries in the linker hash
1789 table, used when linking. This is indexed by the symbol index
1790 minus the sh_info field of the symbol table header. */
1791 struct elf_link_hash_entry **sym_hashes;
1793 /* Track usage and final offsets of GOT entries for local symbols.
1794 This array is indexed by symbol index. Elements are used
1795 identically to "got" in struct elf_link_hash_entry. */
1798 bfd_signed_vma *refcounts;
1800 struct got_entry **ents;
1803 /* The linker ELF emulation code needs to let the backend ELF linker
1804 know what filename should be used for a dynamic object if the
1805 dynamic object is found using a search. The emulation code then
1806 sometimes needs to know what name was actually used. Until the
1807 file has been added to the linker symbol table, this field holds
1808 the name the linker wants. After it has been added, it holds the
1809 name actually used, which will be the DT_SONAME entry if there is
1811 const char *dt_name;
1813 /* The linker emulation needs to know what audit libs
1814 are used by a dynamic object. */
1815 const char *dt_audit;
1817 /* Used by find_nearest_line entry point. */
1820 /* A place to stash dwarf1 info for this bfd. */
1821 struct dwarf1_debug *dwarf1_find_line_info;
1823 /* A place to stash dwarf2 info for this bfd. */
1824 void *dwarf2_find_line_info;
1826 /* Stash away info for yet another find line/function variant. */
1827 void *elf_find_function_cache;
1829 /* Number of symbol version definitions we are about to emit. */
1830 unsigned int cverdefs;
1832 /* Number of symbol version references we are about to emit. */
1833 unsigned int cverrefs;
1835 /* Symbol version definitions in external objects. */
1836 Elf_Internal_Verdef *verdef;
1838 /* Symbol version references to external objects. */
1839 Elf_Internal_Verneed *verref;
1841 /* A pointer to the .eh_frame section. */
1842 asection *eh_frame_section;
1844 /* Symbol buffer. */
1847 /* List of GNU properties. Will be updated by setup_gnu_properties
1848 after all input GNU properties are merged for output. */
1849 elf_property_list *properties;
1851 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1852 obj_attribute_list *other_obj_attributes[2];
1854 /* Linked-list containing information about every Systemtap section
1855 found in the object file. Each section corresponds to one entry
1857 struct sdt_note *sdt_note_head;
1859 Elf_Internal_Shdr **group_sect_ptr;
1862 unsigned int symtab_section, dynsymtab_section;
1863 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1865 /* An identifier used to distinguish different target
1866 specific extensions to this structure. */
1867 enum elf_target_id object_id;
1869 /* Whether a dyanmic object was specified normally on the linker
1870 command line, or was specified when --as-needed was in effect,
1871 or was found via a DT_NEEDED entry. */
1872 enum dynamic_lib_link_class dyn_lib_class;
1874 /* Irix 5 often screws up the symbol table, sorting local symbols
1875 after global symbols. This flag is set if the symbol table in
1876 this BFD appears to be screwed up. If it is, we ignore the
1877 sh_info field in the symbol table header, and always read all the
1879 bfd_boolean bad_symtab;
1881 enum elf_gnu_symbols has_gnu_symbols;
1883 /* Information grabbed from an elf core file. */
1884 struct core_elf_obj_tdata *core;
1886 /* More information held for output ELF BFDs. */
1887 struct output_elf_obj_tdata *o;
1890 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1892 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1893 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> o->program_header_size)
1894 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1895 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1896 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1897 #define elf_seg_map(bfd) (elf_tdata(bfd) -> o->seg_map)
1898 #define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
1899 #define elf_eh_frame_hdr(bfd) (elf_tdata(bfd) -> o->eh_frame_hdr)
1900 #define elf_linker(bfd) (elf_tdata(bfd) -> o->linker)
1901 #define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
1902 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
1903 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1904 #define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list)
1905 #define elf_strtab_sec(bfd) (elf_tdata(bfd) -> o->strtab_section)
1906 #define elf_shstrtab_sec(bfd) (elf_tdata(bfd) -> o->shstrtab_section)
1907 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1908 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1909 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1910 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1911 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1912 #define elf_eh_frame_section(bfd) \
1913 (elf_tdata(bfd) -> eh_frame_section)
1914 #define elf_section_syms(bfd) (elf_tdata(bfd) -> o->section_syms)
1915 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> o->num_section_syms)
1916 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1917 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1918 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1919 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1920 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1921 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1922 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1923 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1924 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1925 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1926 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1927 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1928 #define elf_flags_init(bfd) (elf_tdata(bfd) -> o->flags_init)
1929 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1930 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1931 #define elf_known_obj_attributes_proc(bfd) \
1932 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1933 #define elf_other_obj_attributes_proc(bfd) \
1934 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1935 #define elf_properties(bfd) (elf_tdata (bfd) -> properties)
1937 extern void _bfd_elf_swap_verdef_in
1938 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1939 extern void _bfd_elf_swap_verdef_out
1940 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1941 extern void _bfd_elf_swap_verdaux_in
1942 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1943 extern void _bfd_elf_swap_verdaux_out
1944 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1945 extern void _bfd_elf_swap_verneed_in
1946 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1947 extern void _bfd_elf_swap_verneed_out
1948 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1949 extern void _bfd_elf_swap_vernaux_in
1950 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1951 extern void _bfd_elf_swap_vernaux_out
1952 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1953 extern void _bfd_elf_swap_versym_in
1954 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1955 extern void _bfd_elf_swap_versym_out
1956 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1958 extern unsigned int _bfd_elf_section_from_bfd_section
1959 (bfd *, asection *);
1960 extern char *bfd_elf_string_from_elf_section
1961 (bfd *, unsigned, unsigned);
1962 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1963 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1964 Elf_External_Sym_Shndx *);
1965 extern const char *bfd_elf_sym_name
1966 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1968 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1970 extern bfd_boolean _bfd_elf_print_private_bfd_data
1972 const char * _bfd_elf_get_symbol_version_string
1973 (bfd *, asymbol *, bfd_boolean *);
1974 extern void bfd_elf_print_symbol
1975 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1977 extern unsigned int _bfd_elf_eh_frame_address_size
1978 (bfd *, asection *);
1979 extern bfd_byte _bfd_elf_encode_eh_address
1980 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1981 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1982 extern bfd_boolean _bfd_elf_can_make_relative
1983 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1985 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1986 (const struct bfd_link_info *, const asection *,
1987 const Elf_Internal_Rela *);
1988 extern bfd_vma _bfd_elf_rela_local_sym
1989 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1990 extern bfd_vma _bfd_elf_rel_local_sym
1991 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1992 extern bfd_vma _bfd_elf_section_offset
1993 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1995 extern unsigned long bfd_elf_hash
1997 extern unsigned long bfd_elf_gnu_hash
2000 extern bfd_reloc_status_type bfd_elf_generic_reloc
2001 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
2002 extern bfd_boolean bfd_elf_allocate_object
2003 (bfd *, size_t, enum elf_target_id);
2004 extern bfd_boolean bfd_elf_make_object
2006 extern bfd_boolean bfd_elf_mkcorefile
2008 extern bfd_boolean _bfd_elf_make_section_from_shdr
2009 (bfd *, Elf_Internal_Shdr *, const char *, int);
2010 extern bfd_boolean _bfd_elf_make_section_from_phdr
2011 (bfd *, Elf_Internal_Phdr *, int, const char *);
2012 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
2013 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
2014 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
2016 extern void _bfd_elf_link_hash_table_free
2018 extern void _bfd_elf_link_hash_copy_indirect
2019 (struct bfd_link_info *, struct elf_link_hash_entry *,
2020 struct elf_link_hash_entry *);
2021 extern void _bfd_elf_link_hash_hide_symbol
2022 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
2023 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
2024 (struct bfd_link_info *, struct elf_link_hash_entry *);
2025 extern bfd_boolean _bfd_elf_link_hash_table_init
2026 (struct elf_link_hash_table *, bfd *,
2027 struct bfd_hash_entry *(*)
2028 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
2029 unsigned int, enum elf_target_id);
2030 extern bfd_boolean _bfd_elf_slurp_version_tables
2031 (bfd *, bfd_boolean);
2032 extern bfd_boolean _bfd_elf_merge_sections
2033 (bfd *, struct bfd_link_info *);
2034 extern bfd_boolean _bfd_elf_match_sections_by_type
2035 (bfd *, const asection *, bfd *, const asection *);
2036 extern bfd_boolean bfd_elf_is_group_section
2037 (bfd *, const struct bfd_section *);
2038 extern bfd_boolean _bfd_elf_section_already_linked
2039 (bfd *, asection *, struct bfd_link_info *);
2040 extern void bfd_elf_set_group_contents
2041 (bfd *, asection *, void *);
2042 extern unsigned int _bfd_elf_filter_global_symbols
2043 (bfd *, struct bfd_link_info *, asymbol **, long);
2044 extern asection *_bfd_elf_check_kept_section
2045 (asection *, struct bfd_link_info *);
2046 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
2047 extern void _bfd_elf_copy_link_hash_symbol_type
2048 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
2049 extern bfd_boolean _bfd_elf_size_group_sections
2050 (struct bfd_link_info *);
2051 extern bfd_boolean _bfd_elf_fixup_group_sections
2052 (bfd *, asection *);
2053 extern bfd_boolean _bfd_elf_copy_private_header_data
2055 extern bfd_boolean _bfd_elf_copy_private_symbol_data
2056 (bfd *, asymbol *, bfd *, asymbol *);
2057 #define _bfd_generic_init_private_section_data \
2058 _bfd_elf_init_private_section_data
2059 extern bfd_boolean _bfd_elf_init_private_section_data
2060 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
2061 extern bfd_boolean _bfd_elf_copy_private_section_data
2062 (bfd *, asection *, bfd *, asection *);
2063 extern bfd_boolean _bfd_elf_write_object_contents
2065 extern bfd_boolean _bfd_elf_write_corefile_contents
2067 extern bfd_boolean _bfd_elf_set_section_contents
2068 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
2069 extern long _bfd_elf_get_symtab_upper_bound
2071 extern long _bfd_elf_canonicalize_symtab
2072 (bfd *, asymbol **);
2073 extern long _bfd_elf_get_dynamic_symtab_upper_bound
2075 extern long _bfd_elf_canonicalize_dynamic_symtab
2076 (bfd *, asymbol **);
2077 extern long _bfd_elf_get_synthetic_symtab
2078 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
2079 extern long _bfd_elf_get_reloc_upper_bound
2081 extern long _bfd_elf_canonicalize_reloc
2082 (bfd *, sec_ptr, arelent **, asymbol **);
2083 extern asection * _bfd_elf_get_dynamic_reloc_section
2084 (bfd *, asection *, bfd_boolean);
2085 extern asection * _bfd_elf_make_dynamic_reloc_section
2086 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
2087 extern long _bfd_elf_get_dynamic_reloc_upper_bound
2089 extern long _bfd_elf_canonicalize_dynamic_reloc
2090 (bfd *, arelent **, asymbol **);
2091 extern asymbol *_bfd_elf_make_empty_symbol
2093 extern void _bfd_elf_get_symbol_info
2094 (bfd *, asymbol *, symbol_info *);
2095 extern bfd_boolean _bfd_elf_is_local_label_name
2096 (bfd *, const char *);
2097 extern alent *_bfd_elf_get_lineno
2099 extern bfd_boolean _bfd_elf_set_arch_mach
2100 (bfd *, enum bfd_architecture, unsigned long);
2101 extern bfd_boolean _bfd_elf_find_nearest_line
2102 (bfd *, asymbol **, asection *, bfd_vma,
2103 const char **, const char **, unsigned int *, unsigned int *);
2104 extern bfd_boolean _bfd_elf_find_line
2105 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
2106 extern bfd_boolean _bfd_elf_find_inliner_info
2107 (bfd *, const char **, const char **, unsigned int *);
2108 extern asymbol *_bfd_elf_find_function
2109 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **);
2110 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
2111 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
2112 extern int _bfd_elf_sizeof_headers
2113 (bfd *, struct bfd_link_info *);
2114 extern bfd_boolean _bfd_elf_new_section_hook
2115 (bfd *, asection *);
2116 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
2117 (const char *, const struct bfd_elf_special_section *, unsigned int);
2118 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
2119 (bfd *, asection *);
2121 /* If the target doesn't have reloc handling written yet: */
2122 extern void _bfd_elf_no_info_to_howto
2123 (bfd *, arelent *, Elf_Internal_Rela *);
2125 extern bfd_boolean bfd_section_from_shdr
2126 (bfd *, unsigned int shindex);
2127 extern bfd_boolean bfd_section_from_phdr
2128 (bfd *, Elf_Internal_Phdr *, int);
2130 extern int _bfd_elf_symbol_from_bfd_symbol
2131 (bfd *, asymbol **);
2133 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
2134 (struct sym_cache *, bfd *, unsigned long);
2135 extern asection *bfd_section_from_elf_index
2136 (bfd *, unsigned int);
2138 extern struct elf_strtab_hash * _bfd_elf_strtab_init
2140 extern void _bfd_elf_strtab_free
2141 (struct elf_strtab_hash *);
2142 extern size_t _bfd_elf_strtab_add
2143 (struct elf_strtab_hash *, const char *, bfd_boolean);
2144 extern void _bfd_elf_strtab_addref
2145 (struct elf_strtab_hash *, size_t);
2146 extern void _bfd_elf_strtab_delref
2147 (struct elf_strtab_hash *, size_t);
2148 extern unsigned int _bfd_elf_strtab_refcount
2149 (struct elf_strtab_hash *, size_t);
2150 extern void _bfd_elf_strtab_clear_all_refs
2151 (struct elf_strtab_hash *);
2152 extern void *_bfd_elf_strtab_save
2153 (struct elf_strtab_hash *);
2154 extern void _bfd_elf_strtab_restore
2155 (struct elf_strtab_hash *, void *);
2156 extern bfd_size_type _bfd_elf_strtab_size
2157 (struct elf_strtab_hash *);
2158 extern bfd_size_type _bfd_elf_strtab_offset
2159 (struct elf_strtab_hash *, size_t);
2160 extern bfd_boolean _bfd_elf_strtab_emit
2161 (bfd *, struct elf_strtab_hash *);
2162 extern void _bfd_elf_strtab_finalize
2163 (struct elf_strtab_hash *);
2165 extern bfd_boolean bfd_elf_parse_eh_frame_entries
2166 (bfd *, struct bfd_link_info *);
2167 extern bfd_boolean _bfd_elf_parse_eh_frame_entry
2168 (struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2169 extern void _bfd_elf_parse_eh_frame
2170 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
2171 extern bfd_boolean _bfd_elf_end_eh_frame_parsing
2172 (struct bfd_link_info *info);
2174 extern bfd_boolean _bfd_elf_discard_section_eh_frame
2175 (bfd *, struct bfd_link_info *, asection *,
2176 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
2177 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
2178 (bfd *, struct bfd_link_info *);
2179 extern bfd_vma _bfd_elf_eh_frame_section_offset
2180 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
2181 extern bfd_boolean _bfd_elf_write_section_eh_frame
2182 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2183 bfd_boolean _bfd_elf_write_section_eh_frame_entry
2184 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
2185 extern bfd_boolean _bfd_elf_fixup_eh_frame_hdr (struct bfd_link_info *);
2186 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
2187 (bfd *, struct bfd_link_info *);
2188 extern bfd_boolean _bfd_elf_eh_frame_present
2189 (struct bfd_link_info *);
2190 extern bfd_boolean _bfd_elf_eh_frame_entry_present
2191 (struct bfd_link_info *);
2192 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
2193 (struct bfd_link_info *);
2195 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
2197 extern long _bfd_elf_link_lookup_local_dynindx
2198 (struct bfd_link_info *, bfd *, long);
2199 extern bfd_boolean _bfd_elf_compute_section_file_positions
2200 (bfd *, struct bfd_link_info *);
2201 extern file_ptr _bfd_elf_assign_file_position_for_section
2202 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
2204 extern bfd_boolean _bfd_elf_validate_reloc
2207 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2208 (bfd *, struct bfd_link_info *);
2209 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2210 (bfd *, struct bfd_link_info *, asection *);
2211 extern bfd_boolean _bfd_elf_create_dynamic_sections
2212 (bfd *, struct bfd_link_info *);
2213 extern bfd_boolean _bfd_elf_create_got_section
2214 (bfd *, struct bfd_link_info *);
2215 extern asection *_bfd_elf_section_for_symbol
2216 (struct elf_reloc_cookie *, unsigned long, bfd_boolean);
2217 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2218 (bfd *, struct bfd_link_info *, asection *, const char *);
2219 extern void _bfd_elf_init_1_index_section
2220 (bfd *, struct bfd_link_info *);
2221 extern void _bfd_elf_init_2_index_sections
2222 (bfd *, struct bfd_link_info *);
2224 extern bfd_boolean _bfd_elfcore_make_pseudosection
2225 (bfd *, char *, size_t, ufile_ptr);
2226 extern char *_bfd_elfcore_strndup
2227 (bfd *, char *, size_t);
2229 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2230 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2232 extern bfd_boolean _bfd_elf_link_output_relocs
2233 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2234 struct elf_link_hash_entry **);
2236 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2237 (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
2239 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2240 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2242 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2243 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2245 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2246 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2248 extern bfd_boolean _bfd_elf_setup_sections
2251 extern void _bfd_elf_post_process_headers (bfd * , struct bfd_link_info *);
2253 extern const bfd_target *bfd_elf32_object_p
2255 extern const bfd_target *bfd_elf32_core_file_p
2257 extern char *bfd_elf32_core_file_failing_command
2259 extern int bfd_elf32_core_file_failing_signal
2261 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2263 extern int bfd_elf32_core_file_pid
2266 extern bfd_boolean bfd_elf32_swap_symbol_in
2267 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2268 extern void bfd_elf32_swap_symbol_out
2269 (bfd *, const Elf_Internal_Sym *, void *, void *);
2270 extern void bfd_elf32_swap_reloc_in
2271 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2272 extern void bfd_elf32_swap_reloc_out
2273 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2274 extern void bfd_elf32_swap_reloca_in
2275 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2276 extern void bfd_elf32_swap_reloca_out
2277 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2278 extern void bfd_elf32_swap_phdr_in
2279 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2280 extern void bfd_elf32_swap_phdr_out
2281 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2282 extern void bfd_elf32_swap_dyn_in
2283 (bfd *, const void *, Elf_Internal_Dyn *);
2284 extern void bfd_elf32_swap_dyn_out
2285 (bfd *, const Elf_Internal_Dyn *, void *);
2286 extern long bfd_elf32_slurp_symbol_table
2287 (bfd *, asymbol **, bfd_boolean);
2288 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2290 extern int bfd_elf32_write_out_phdrs
2291 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2292 extern bfd_boolean bfd_elf32_checksum_contents
2293 (bfd * , void (*) (const void *, size_t, void *), void *);
2294 extern void bfd_elf32_write_relocs
2295 (bfd *, asection *, void *);
2296 extern bfd_boolean bfd_elf32_slurp_reloc_table
2297 (bfd *, asection *, asymbol **, bfd_boolean);
2299 extern const bfd_target *bfd_elf64_object_p
2301 extern const bfd_target *bfd_elf64_core_file_p
2303 extern char *bfd_elf64_core_file_failing_command
2305 extern int bfd_elf64_core_file_failing_signal
2307 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2309 extern int bfd_elf64_core_file_pid
2312 extern bfd_boolean bfd_elf64_swap_symbol_in
2313 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2314 extern void bfd_elf64_swap_symbol_out
2315 (bfd *, const Elf_Internal_Sym *, void *, void *);
2316 extern void bfd_elf64_swap_reloc_in
2317 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2318 extern void bfd_elf64_swap_reloc_out
2319 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2320 extern void bfd_elf64_swap_reloca_in
2321 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2322 extern void bfd_elf64_swap_reloca_out
2323 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2324 extern void bfd_elf64_swap_phdr_in
2325 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2326 extern void bfd_elf64_swap_phdr_out
2327 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2328 extern void bfd_elf64_swap_dyn_in
2329 (bfd *, const void *, Elf_Internal_Dyn *);
2330 extern void bfd_elf64_swap_dyn_out
2331 (bfd *, const Elf_Internal_Dyn *, void *);
2332 extern long bfd_elf64_slurp_symbol_table
2333 (bfd *, asymbol **, bfd_boolean);
2334 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2336 extern int bfd_elf64_write_out_phdrs
2337 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2338 extern bfd_boolean bfd_elf64_checksum_contents
2339 (bfd * , void (*) (const void *, size_t, void *), void *);
2340 extern void bfd_elf64_write_relocs
2341 (bfd *, asection *, void *);
2342 extern bfd_boolean bfd_elf64_slurp_reloc_table
2343 (bfd *, asection *, asymbol **, bfd_boolean);
2345 extern bfd_boolean _bfd_elf_default_relocs_compatible
2346 (const bfd_target *, const bfd_target *);
2348 extern bfd_boolean _bfd_elf_relocs_compatible
2349 (const bfd_target *, const bfd_target *);
2350 extern bfd_boolean _bfd_elf_notice_as_needed
2351 (bfd *, struct bfd_link_info *, enum notice_asneeded_action);
2353 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2354 (bfd *, struct bfd_link_info *, const char *);
2355 extern bfd_boolean bfd_elf_link_add_symbols
2356 (bfd *, struct bfd_link_info *);
2357 extern bfd_boolean _bfd_elf_add_dynamic_entry
2358 (struct bfd_link_info *, bfd_vma, bfd_vma);
2359 extern bfd_boolean _bfd_elf_link_check_relocs
2360 (bfd *, struct bfd_link_info *);
2362 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2363 (struct bfd_link_info *, struct elf_link_hash_entry *);
2365 extern int bfd_elf_link_record_local_dynamic_symbol
2366 (struct bfd_link_info *, bfd *, long);
2368 extern bfd_boolean _bfd_elf_close_and_cleanup
2371 extern bfd_boolean _bfd_elf_common_definition
2372 (Elf_Internal_Sym *);
2374 extern unsigned int _bfd_elf_common_section_index
2377 extern asection *_bfd_elf_common_section
2380 extern bfd_vma _bfd_elf_default_got_elt_size
2381 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2384 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2385 (bfd *, arelent *, struct bfd_symbol *, void *,
2386 asection *, bfd *, char **);
2388 extern bfd_boolean bfd_elf_final_link
2389 (bfd *, struct bfd_link_info *);
2391 extern void _bfd_elf_gc_keep
2392 (struct bfd_link_info *info);
2394 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2395 (struct elf_link_hash_entry *h, void *inf);
2397 extern bfd_boolean bfd_elf_gc_sections
2398 (bfd *, struct bfd_link_info *);
2400 extern bfd_boolean bfd_elf_gc_record_vtinherit
2401 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2403 extern bfd_boolean bfd_elf_gc_record_vtentry
2404 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2406 extern asection *_bfd_elf_gc_mark_hook
2407 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2408 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2410 extern asection *_bfd_elf_gc_mark_rsec
2411 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2412 struct elf_reloc_cookie *, bfd_boolean *);
2414 extern bfd_boolean _bfd_elf_gc_mark_reloc
2415 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2416 struct elf_reloc_cookie *);
2418 extern bfd_boolean _bfd_elf_gc_mark_fdes
2419 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2420 struct elf_reloc_cookie *);
2422 extern bfd_boolean _bfd_elf_gc_mark
2423 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2425 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2426 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2428 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2429 (bfd *, struct bfd_link_info *);
2431 extern bfd_boolean bfd_elf_gc_common_final_link
2432 (bfd *, struct bfd_link_info *);
2434 extern asection *_bfd_elf_is_start_stop
2435 (const struct bfd_link_info *, struct elf_link_hash_entry *);
2437 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2440 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2441 (bfd *, asection *);
2443 extern bfd_boolean _bfd_elf_map_sections_to_segments
2444 (bfd *, struct bfd_link_info *);
2446 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2448 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2451 extern asection *_bfd_elf_get_reloc_section (asection *);
2453 extern int bfd_elf_get_default_section_type (flagword);
2455 extern bfd_boolean bfd_elf_lookup_section_flags
2456 (struct bfd_link_info *, struct flag_info *, asection *);
2458 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2459 (bfd * abfd, asection * section);
2461 /* PowerPC @tls opcode transform/validate. */
2462 extern unsigned int _bfd_elf_ppc_at_tls_transform
2463 (unsigned int, unsigned int);
2464 /* PowerPC @tprel opcode transform/validate. */
2465 extern unsigned int _bfd_elf_ppc_at_tprel_transform
2466 (unsigned int, unsigned int);
2467 /* PowerPC elf_object_p tweak. */
2468 extern bfd_boolean _bfd_elf_ppc_set_arch (bfd *);
2469 /* PowerPC .gnu.attributes handling common to both 32-bit and 64-bit. */
2470 extern void _bfd_elf_ppc_merge_fp_attributes (bfd *, struct bfd_link_info *);
2472 /* Exported interface for writing elf corefile notes. */
2473 extern char *elfcore_write_note
2474 (bfd *, char *, int *, const char *, int, const void *, int);
2475 extern char *elfcore_write_prpsinfo
2476 (bfd *, char *, int *, const char *, const char *);
2477 extern char *elfcore_write_prstatus
2478 (bfd *, char *, int *, long, int, const void *);
2479 extern char * elfcore_write_pstatus
2480 (bfd *, char *, int *, long, int, const void *);
2481 extern char *elfcore_write_prfpreg
2482 (bfd *, char *, int *, const void *, int);
2483 extern char *elfcore_write_prxfpreg
2484 (bfd *, char *, int *, const void *, int);
2485 extern char *elfcore_write_xstatereg
2486 (bfd *, char *, int *, const void *, int);
2487 extern char *elfcore_write_ppc_vmx
2488 (bfd *, char *, int *, const void *, int);
2489 extern char *elfcore_write_ppc_vsx
2490 (bfd *, char *, int *, const void *, int);
2491 extern char *elfcore_write_s390_timer
2492 (bfd *, char *, int *, const void *, int);
2493 extern char *elfcore_write_s390_todcmp
2494 (bfd *, char *, int *, const void *, int);
2495 extern char *elfcore_write_s390_todpreg
2496 (bfd *, char *, int *, const void *, int);
2497 extern char *elfcore_write_s390_ctrs
2498 (bfd *, char *, int *, const void *, int);
2499 extern char *elfcore_write_s390_prefix
2500 (bfd *, char *, int *, const void *, int);
2501 extern char *elfcore_write_s390_last_break
2502 (bfd *, char *, int *, const void *, int);
2503 extern char *elfcore_write_s390_system_call
2504 (bfd *, char *, int *, const void *, int);
2505 extern char *elfcore_write_s390_tdb
2506 (bfd *, char *, int *, const void *, int);
2507 extern char *elfcore_write_s390_vxrs_low
2508 (bfd *, char *, int *, const void *, int);
2509 extern char *elfcore_write_s390_vxrs_high
2510 (bfd *, char *, int *, const void *, int);
2511 extern char *elfcore_write_arm_vfp
2512 (bfd *, char *, int *, const void *, int);
2513 extern char *elfcore_write_aarch_tls
2514 (bfd *, char *, int *, const void *, int);
2515 extern char *elfcore_write_aarch_hw_break
2516 (bfd *, char *, int *, const void *, int);
2517 extern char *elfcore_write_aarch_hw_watch
2518 (bfd *, char *, int *, const void *, int);
2519 extern char *elfcore_write_lwpstatus
2520 (bfd *, char *, int *, long, int, const void *);
2521 extern char *elfcore_write_register_note
2522 (bfd *, char *, int *, const char *, const void *, int);
2524 /* Internal structure which holds information to be included in the
2525 PRPSINFO section of Linux core files.
2527 This is an "internal" structure in the sense that it should be used
2528 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2529 function), so things like endianess shouldn't be an issue. This
2530 structure will eventually be converted in one of the
2531 `elf_external_linux_*' structures and written out to an output bfd
2532 by one of the functions declared below. */
2534 struct elf_internal_linux_prpsinfo
2536 char pr_state; /* Numeric process state. */
2537 char pr_sname; /* Char for pr_state. */
2538 char pr_zomb; /* Zombie. */
2539 char pr_nice; /* Nice val. */
2540 unsigned long pr_flag; /* Flags. */
2541 unsigned int pr_uid;
2542 unsigned int pr_gid;
2543 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2544 char pr_fname[16 + 1]; /* Filename of executable. */
2545 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2548 /* Linux/most 32-bit archs. */
2549 extern char *elfcore_write_linux_prpsinfo32
2550 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2552 /* Linux/most 64-bit archs. */
2553 extern char *elfcore_write_linux_prpsinfo64
2554 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2556 /* Linux/PPC32 uses different layout compared to most archs. */
2557 extern char *elfcore_write_ppc_linux_prpsinfo32
2558 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2560 extern bfd *_bfd_elf32_bfd_from_remote_memory
2561 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2562 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2563 extern bfd *_bfd_elf64_bfd_from_remote_memory
2564 (bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
2565 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2567 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2568 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2569 extern int bfd_elf_get_obj_attr_int (bfd *, int, unsigned int);
2570 extern void bfd_elf_add_obj_attr_int (bfd *, int, unsigned int, unsigned int);
2571 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2572 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2573 extern void bfd_elf_add_obj_attr_string (bfd *, int, unsigned int, const char *);
2574 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2575 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2576 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, unsigned int,
2577 unsigned int, const char *);
2578 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2579 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2582 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2583 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2584 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, unsigned int);
2585 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2586 extern bfd_boolean _bfd_elf_merge_object_attributes
2587 (bfd *, struct bfd_link_info *);
2588 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2589 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2590 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2592 extern bfd_boolean _bfd_elf_parse_gnu_properties
2593 (bfd *, Elf_Internal_Note *);
2594 extern elf_property * _bfd_elf_get_property
2595 (bfd *, unsigned int, unsigned int);
2596 extern void _bfd_elf_link_setup_gnu_properties
2597 (struct bfd_link_info *);
2599 /* The linker may need to keep track of the number of relocs that it
2600 decides to copy as dynamic relocs in check_relocs for each symbol.
2601 This is so that it can later discard them if they are found to be
2602 unnecessary. We can store the information in a field extending the
2603 regular ELF linker hash table. */
2605 struct elf_dyn_relocs
2607 struct elf_dyn_relocs *next;
2609 /* The input section of the reloc. */
2612 /* Total number of relocs copied for the input section. */
2613 bfd_size_type count;
2615 /* Number of pc-relative relocs copied for the input section. */
2616 bfd_size_type pc_count;
2619 extern bfd_boolean _bfd_elf_create_ifunc_sections
2620 (bfd *, struct bfd_link_info *);
2621 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2622 (struct bfd_link_info *, struct elf_link_hash_entry *,
2623 struct elf_dyn_relocs **, bfd_boolean *, unsigned int,
2624 unsigned int, unsigned int, bfd_boolean);
2625 extern long _bfd_elf_ifunc_get_synthetic_symtab
2626 (bfd *, long, asymbol **, long, asymbol **, asymbol **, asection *,
2627 bfd_vma *(*) (bfd *, asymbol **, asection *, asection *));
2629 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2630 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2632 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2633 extern bfd_vma elf64_r_sym (bfd_vma);
2634 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2635 extern bfd_vma elf32_r_sym (bfd_vma);
2637 /* Large common section. */
2638 extern asection _bfd_elf_large_com_section;
2640 /* Hash for local symbol with the first section id, ID, in the input
2641 file and the local symbol index, SYM. */
2642 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2643 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2644 ^ (SYM) ^ ((ID) >> 16))
2646 /* This is the condition under which finish_dynamic_symbol will be called.
2647 If our finish_dynamic_symbol isn't called, we'll need to do something
2648 about initializing any .plt and .got entries in relocate_section. */
2649 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2651 && ((SHARED) || !(H)->forced_local) \
2652 && ((H)->dynindx != -1 || (H)->forced_local))
2654 /* This macro is to avoid lots of duplicated code in the body
2655 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2656 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2657 r_symndx, symtab_hdr, sym_hashes, \
2658 h, sec, relocation, \
2659 unresolved_reloc, warned, ignored) \
2662 /* It seems this can happen with erroneous or unsupported \
2663 input (mixing a.out and elf in an archive, for example.) */ \
2664 if (sym_hashes == NULL) \
2667 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2669 if (info->wrap_hash != NULL \
2670 && (input_section->flags & SEC_DEBUGGING) != 0) \
2671 h = ((struct elf_link_hash_entry *) \
2672 unwrap_hash_lookup (info, input_bfd, &h->root)); \
2674 while (h->root.type == bfd_link_hash_indirect \
2675 || h->root.type == bfd_link_hash_warning) \
2676 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2680 unresolved_reloc = FALSE; \
2682 if (h->root.type == bfd_link_hash_defined \
2683 || h->root.type == bfd_link_hash_defweak) \
2685 sec = h->root.u.def.section; \
2687 || sec->output_section == NULL) \
2688 /* Set a flag that will be cleared later if we find a \
2689 relocation value for this symbol. output_section \
2690 is typically NULL for symbols satisfied by a shared \
2692 unresolved_reloc = TRUE; \
2694 relocation = (h->root.u.def.value \
2695 + sec->output_section->vma \
2696 + sec->output_offset); \
2698 else if (h->root.type == bfd_link_hash_undefweak) \
2700 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2701 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2703 else if (!bfd_link_relocatable (info)) \
2706 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2707 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2708 (*info->callbacks->undefined_symbol) (info, \
2709 h->root.root.string, \
2712 rel->r_offset, err); \
2715 (void) unresolved_reloc; \
2721 /* This macro is to avoid lots of duplicated code in the body of the
2722 loop over relocations in xxx_relocate_section() in the various
2725 Handle relocations against symbols from removed linkonce sections,
2726 or sections discarded by a linker script. When doing a relocatable
2727 link, we remove such relocations. Otherwise, we just want the
2728 section contents zeroed and avoid any special processing. */
2729 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2730 rel, count, relend, \
2731 howto, index, contents) \
2734 _bfd_clear_contents (howto, input_bfd, input_section, \
2735 contents + rel[index].r_offset); \
2737 if (bfd_link_relocatable (info) \
2738 && (input_section->flags & SEC_DEBUGGING)) \
2740 /* Only remove relocations in debug sections since other \
2741 sections may require relocations. */ \
2742 Elf_Internal_Shdr *rel_hdr; \
2744 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2746 /* Avoid empty output section. */ \
2747 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
2749 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2750 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2751 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
2753 memmove (rel, rel + count, \
2754 (relend - rel - count) * sizeof (*rel)); \
2756 input_section->reloc_count--; \
2763 for (i_ = 0; i_ < count; i_++) \
2765 rel[i_].r_info = 0; \
2766 rel[i_].r_addend = 0; \
2772 /* Will a symbol be bound to the definition within the shared
2773 library, if any. A unique symbol can never be bound locally. */
2774 #define SYMBOLIC_BIND(INFO, H) \
2775 (!(H)->unique_global \
2776 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2781 #endif /* _LIBELF_H_ */