1 /* BFD back-end data structures for ELF files.
2 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
27 #include "elf/common.h"
28 #include "elf/external.h"
29 #include "elf/internal.h"
32 /* The number of entries in a section is its size divided by the size
33 of a single entry. This is normally only applicable to reloc and
34 symbol table sections.
35 PR 9934: It is possible to have relocations that do not refer to
36 symbols, thus it is also possible to have a relocation section in
37 an object file, but no symbol table. */
38 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
40 /* If size isn't specified as 64 or 32, NAME macro should fail. */
43 #define NAME(x, y) x ## 64 ## _ ## y
46 #define NAME(x, y) x ## 32 ## _ ## y
51 #define NAME(x, y) x ## NOSIZE ## _ ## y
54 #define ElfNAME(X) NAME(Elf,X)
55 #define elfNAME(X) NAME(elf,X)
57 /* Information held for an ELF symbol. The first field is the
58 corresponding asymbol. Every symbol is an ELF file is actually a
59 pointer to this structure, although it is often handled as a
60 pointer to an asymbol. */
66 /* ELF symbol information. */
67 Elf_Internal_Sym internal_elf_sym;
68 /* Backend specific information. */
71 unsigned int hppa_arg_reloc;
77 /* Version information. This is from an Elf_Internal_Versym
78 structure in a SHT_GNU_versym section. It is zero if there is no
79 version information. */
80 unsigned short version;
84 struct elf_strtab_hash;
90 bfd_signed_vma refcount;
92 struct got_entry *glist;
93 struct plt_entry *plist;
96 struct elf_link_virtual_table_entry
98 /* Virtual table entry use information. This array is nominally of size
99 size/sizeof(target_void_pointer), though we have to be able to assume
100 and track a size while the symbol is still undefined. It is indexed
101 via offset/sizeof(target_void_pointer). */
105 /* Virtual table derivation info. */
106 struct elf_link_hash_entry *parent;
109 /* ELF linker hash table entries. */
111 struct elf_link_hash_entry
113 struct bfd_link_hash_entry root;
115 /* Symbol index in output file. This is initialized to -1. It is
116 set to -2 if the symbol is used by a reloc. */
119 /* Symbol index as a dynamic symbol. Initialized to -1, and remains
120 -1 if this is not a dynamic symbol. */
121 /* ??? Note that this is consistently used as a synonym for tests
122 against whether we can perform various simplifying transformations
123 to the code. (E.g. changing a pc-relative jump to a PLT entry
124 into a pc-relative jump to the target function.) That test, which
125 is often relatively complex, and someplaces wrong or incomplete,
126 should really be replaced by a predicate in elflink.c.
128 End result: this field -1 does not indicate that the symbol is
129 not in the dynamic symbol table, but rather that the symbol is
130 not visible outside this DSO. */
133 /* If this symbol requires an entry in the global offset table, the
134 processor specific backend uses this field to track usage and
135 final offset. Two schemes are supported: The first assumes that
136 a symbol may only have one GOT entry, and uses REFCOUNT until
137 size_dynamic_sections, at which point the contents of the .got is
138 fixed. Afterward, if OFFSET is -1, then the symbol does not
139 require a global offset table entry. The second scheme allows
140 multiple GOT entries per symbol, managed via a linked list
141 pointed to by GLIST. */
142 union gotplt_union got;
144 /* Same, but tracks a procedure linkage table entry. */
145 union gotplt_union plt;
150 /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.). */
151 unsigned int type : 8;
153 /* Symbol st_other value, symbol visibility. */
154 unsigned int other : 8;
156 /* The symbol's st_target_internal value (see Elf_Internal_Sym). */
157 unsigned int target_internal : 8;
159 /* Symbol is referenced by a non-shared object (other than the object
160 in which it is defined). */
161 unsigned int ref_regular : 1;
162 /* Symbol is defined by a non-shared object. */
163 unsigned int def_regular : 1;
164 /* Symbol is referenced by a shared object. */
165 unsigned int ref_dynamic : 1;
166 /* Symbol is defined by a shared object. */
167 unsigned int def_dynamic : 1;
168 /* Symbol has a non-weak reference from a non-shared object (other than
169 the object in which it is defined). */
170 unsigned int ref_regular_nonweak : 1;
171 /* Dynamic symbol has been adjustd. */
172 unsigned int dynamic_adjusted : 1;
173 /* Symbol needs a copy reloc. */
174 unsigned int needs_copy : 1;
175 /* Symbol needs a procedure linkage table entry. */
176 unsigned int needs_plt : 1;
177 /* Symbol appears in a non-ELF input file. */
178 unsigned int non_elf : 1;
179 /* Symbol should be marked as hidden in the version information. */
180 unsigned int hidden : 1;
181 /* Symbol was forced to local scope due to a version script file. */
182 unsigned int forced_local : 1;
183 /* Symbol was forced to be dynamic due to a version script file. */
184 unsigned int dynamic : 1;
185 /* Symbol was marked during garbage collection. */
186 unsigned int mark : 1;
187 /* Symbol is referenced by a non-GOT/non-PLT relocation. This is
188 not currently set by all the backends. */
189 unsigned int non_got_ref : 1;
190 /* Symbol has a definition in a shared object.
191 FIXME: There is no real need for this field if def_dynamic is never
192 cleared and all places that test def_dynamic also test def_regular. */
193 unsigned int dynamic_def : 1;
194 /* Symbol has a non-weak reference from a shared object. */
195 unsigned int ref_dynamic_nonweak : 1;
196 /* Symbol is referenced with a relocation where C/C++ pointer equality
198 unsigned int pointer_equality_needed : 1;
199 /* Symbol is a unique global symbol. */
200 unsigned int unique_global : 1;
202 /* String table index in .dynstr if this is a dynamic symbol. */
203 unsigned long dynstr_index;
207 /* If this is a weak defined symbol from a dynamic object, this
208 field points to a defined symbol with the same value, if there is
209 one. Otherwise it is NULL. */
210 struct elf_link_hash_entry *weakdef;
212 /* Hash value of the name computed using the ELF hash function.
213 Used part way through size_dynamic_sections, after we've finished
215 unsigned long elf_hash_value;
218 /* Version information. */
221 /* This field is used for a symbol which is not defined in a
222 regular object. It points to the version information read in
223 from the dynamic object. */
224 Elf_Internal_Verdef *verdef;
225 /* This field is used for a symbol which is defined in a regular
226 object. It is set up in size_dynamic_sections. It points to
227 the version information we should write out for this symbol. */
228 struct bfd_elf_version_tree *vertree;
231 struct elf_link_virtual_table_entry *vtable;
234 /* Will references to this symbol always reference the symbol
236 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
237 _bfd_elf_symbol_refs_local_p (H, INFO, 0)
239 /* Will _calls_ to this symbol always call the version in this object? */
240 #define SYMBOL_CALLS_LOCAL(INFO, H) \
241 _bfd_elf_symbol_refs_local_p (H, INFO, 1)
243 /* Common symbols that are turned into definitions don't have the
244 DEF_REGULAR flag set, so they might appear to be undefined. */
245 #define ELF_COMMON_DEF_P(H) \
247 && !(H)->def_dynamic \
248 && (H)->root.type == bfd_link_hash_defined)
250 /* Records local symbols to be emitted in the dynamic symbol table. */
252 struct elf_link_local_dynamic_entry
254 struct elf_link_local_dynamic_entry *next;
256 /* The input bfd this symbol came from. */
259 /* The index of the local symbol being copied. */
262 /* The index in the outgoing dynamic symbol table. */
265 /* A copy of the input symbol. */
266 Elf_Internal_Sym isym;
269 struct elf_link_loaded_list
271 struct elf_link_loaded_list *next;
275 /* Structures used by the eh_frame optimization code. */
280 /* If REMOVED == 1, this is the CIE that the FDE originally used.
281 The CIE belongs to the same .eh_frame input section as the FDE.
283 If REMOVED == 0, this is the CIE that we have chosen to use for
284 the output FDE. The CIE's REMOVED field is also 0, but the CIE
285 might belong to a different .eh_frame input section from the FDE. */
286 struct eh_cie_fde *cie_inf;
287 struct eh_cie_fde *next_for_section;
290 /* CIEs have three states:
292 - REMOVED && !MERGED: Slated for removal because we haven't yet
293 proven that an FDE needs it. FULL_CIE, if nonnull, points to
294 more detailed information about the CIE.
296 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
297 which may not belong to the same input section.
299 - !REMOVED: We have decided to keep this CIE. SEC is the
300 .eh_frame input section that contains the CIE. */
302 struct cie *full_cie;
303 struct eh_cie_fde *merged_with;
307 /* The offset of the personality data from the start of the CIE,
308 or 0 if the CIE doesn't have any. */
309 unsigned int personality_offset : 8;
311 /* True if we have marked relocations associated with this CIE. */
312 unsigned int gc_mark : 1;
314 /* True if we have decided to turn an absolute LSDA encoding into
315 a PC-relative one. */
316 unsigned int make_lsda_relative : 1;
318 /* True if we have decided to turn an absolute personality
319 encoding into a PC-relative one. */
320 unsigned int make_per_encoding_relative : 1;
322 /* True if the CIE contains personality data and if that
323 data uses a PC-relative encoding. Always true when
324 make_per_encoding_relative is. */
325 unsigned int per_encoding_relative : 1;
327 /* True if we need to add an 'R' (FDE encoding) entry to the
328 CIE's augmentation data. */
329 unsigned int add_fde_encoding : 1;
331 /* True if we have merged this CIE with another. */
332 unsigned int merged : 1;
335 unsigned int pad1 : 18;
338 unsigned int reloc_index;
341 unsigned int new_offset;
342 unsigned int fde_encoding : 8;
343 unsigned int lsda_encoding : 8;
344 unsigned int lsda_offset : 8;
346 /* True if this entry represents a CIE, false if it represents an FDE. */
347 unsigned int cie : 1;
349 /* True if this entry is currently marked for removal. */
350 unsigned int removed : 1;
352 /* True if we need to add a 'z' (augmentation size) entry to the CIE's
353 augmentation data, and an associated byte to each of the CIE's FDEs. */
354 unsigned int add_augmentation_size : 1;
356 /* True if we have decided to convert absolute FDE relocations into
357 relative ones. This applies to the first relocation in the FDE,
358 which is against the code that the FDE describes. */
359 unsigned int make_relative : 1;
362 unsigned int pad1 : 4;
364 unsigned int *set_loc;
367 struct eh_frame_sec_info
371 struct eh_cie_fde entry[1];
374 struct eh_frame_array_ent
382 struct eh_frame_hdr_info
386 unsigned int fde_count, array_count;
387 struct eh_frame_array_ent *array;
388 /* TRUE if we should try to merge CIEs between input sections. */
389 bfd_boolean merge_cies;
390 /* TRUE if all .eh_frames have been parsd. */
391 bfd_boolean parsed_eh_frames;
392 /* TRUE if .eh_frame_hdr should contain the sorted search table.
393 We build it if we successfully read all .eh_frame input sections
394 and recognize them. */
398 /* Enum used to identify target specific extensions to the elf_obj_tdata
399 and elf_link_hash_table structures. Note the enums deliberately start
400 from 1 so that we can detect an uninitialized field. The generic value
401 is last so that additions to this enum do not need to modify more than
405 AARCH64_ELF_DATA = 1,
439 /* ELF linker hash table. */
441 struct elf_link_hash_table
443 struct bfd_link_hash_table root;
445 /* An identifier used to distinguish different target
446 specific extensions to this structure. */
447 enum elf_target_id hash_table_id;
449 /* Whether we have created the special dynamic sections required
450 when linking against or generating a shared object. */
451 bfd_boolean dynamic_sections_created;
453 /* True if this target has relocatable executables, so needs dynamic
455 bfd_boolean is_relocatable_executable;
457 /* The BFD used to hold special sections created by the linker.
458 This will be the first BFD found which requires these sections to
462 /* The value to use when initialising got.refcount/offset and
463 plt.refcount/offset in an elf_link_hash_entry. Set to zero when
464 the values are refcounts. Set to init_got_offset/init_plt_offset
465 in size_dynamic_sections when the values may be offsets. */
466 union gotplt_union init_got_refcount;
467 union gotplt_union init_plt_refcount;
469 /* The value to use for got.refcount/offset and plt.refcount/offset
470 when the values may be offsets. Normally (bfd_vma) -1. */
471 union gotplt_union init_got_offset;
472 union gotplt_union init_plt_offset;
474 /* The number of symbols found in the link which must be put into
475 the .dynsym section. */
476 bfd_size_type dynsymcount;
478 /* The string table of dynamic symbols, which becomes the .dynstr
480 struct elf_strtab_hash *dynstr;
482 /* The number of buckets in the hash table in the .hash section.
483 This is based on the number of dynamic symbols. */
484 bfd_size_type bucketcount;
486 /* A linked list of DT_NEEDED names found in dynamic objects
487 included in the link. */
488 struct bfd_link_needed_list *needed;
490 /* Sections in the output bfd that provides a section symbol
491 to be used by relocations emitted against local symbols.
492 Most targets will not use data_index_section. */
493 asection *text_index_section;
494 asection *data_index_section;
496 /* The _GLOBAL_OFFSET_TABLE_ symbol. */
497 struct elf_link_hash_entry *hgot;
499 /* The _PROCEDURE_LINKAGE_TABLE_ symbol. */
500 struct elf_link_hash_entry *hplt;
502 /* The _DYNAMIC symbol. */
503 struct elf_link_hash_entry *hdynamic;
505 /* A pointer to information used to merge SEC_MERGE sections. */
508 /* Used to link stabs in sections. */
509 struct stab_info stab_info;
511 /* Used by eh_frame code when editing .eh_frame. */
512 struct eh_frame_hdr_info eh_info;
514 /* A linked list of local symbols to be added to .dynsym. */
515 struct elf_link_local_dynamic_entry *dynlocal;
517 /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
518 objects included in the link. */
519 struct bfd_link_needed_list *runpath;
521 /* Cached first output tls section and size of PT_TLS segment. */
523 bfd_size_type tls_size;
525 /* A linked list of BFD's loaded in the link. */
526 struct elf_link_loaded_list *loaded;
528 /* Short-cuts to get to dynamic linker sections. */
540 /* Look up an entry in an ELF linker hash table. */
542 #define elf_link_hash_lookup(table, string, create, copy, follow) \
543 ((struct elf_link_hash_entry *) \
544 bfd_link_hash_lookup (&(table)->root, (string), (create), \
547 /* Traverse an ELF linker hash table. */
549 #define elf_link_hash_traverse(table, func, info) \
550 (bfd_link_hash_traverse \
552 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
555 /* Get the ELF linker hash table from a link_info structure. */
557 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
559 #define elf_hash_table_id(table) ((table) -> hash_table_id)
561 /* Returns TRUE if the hash table is a struct elf_link_hash_table. */
562 #define is_elf_hash_table(htab) \
563 (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
565 /* Used by bfd_sym_from_r_symndx to cache a small number of local
567 #define LOCAL_SYM_CACHE_SIZE 32
571 unsigned long indx[LOCAL_SYM_CACHE_SIZE];
572 Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
575 /* Constant information held for an ELF backend. */
577 struct elf_size_info {
578 unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
579 unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
581 /* The size of entries in the .hash section. */
582 unsigned char sizeof_hash_entry;
584 /* The number of internal relocations to allocate per external
586 unsigned char int_rels_per_ext_rel;
587 /* We use some fixed size arrays. This should be large enough to
588 handle all back-ends. */
589 #define MAX_INT_RELS_PER_EXT_REL 3
591 unsigned char arch_size, log_file_align;
592 unsigned char elfclass, ev_current;
593 int (*write_out_phdrs)
594 (bfd *, const Elf_Internal_Phdr *, unsigned int);
596 (*write_shdrs_and_ehdr) (bfd *);
597 bfd_boolean (*checksum_contents)
598 (bfd * , void (*) (const void *, size_t, void *), void *);
600 (bfd *, asection *, void *);
601 bfd_boolean (*swap_symbol_in)
602 (bfd *, const void *, const void *, Elf_Internal_Sym *);
603 void (*swap_symbol_out)
604 (bfd *, const Elf_Internal_Sym *, void *, void *);
605 bfd_boolean (*slurp_reloc_table)
606 (bfd *, asection *, asymbol **, bfd_boolean);
607 long (*slurp_symbol_table)
608 (bfd *, asymbol **, bfd_boolean);
610 (bfd *, const void *, Elf_Internal_Dyn *);
612 (bfd *, const Elf_Internal_Dyn *, void *);
614 /* This function is called to swap in a REL relocation. If an
615 external relocation corresponds to more than one internal
616 relocation, then all relocations are swapped in at once. */
617 void (*swap_reloc_in)
618 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
620 /* This function is called to swap out a REL relocation. */
621 void (*swap_reloc_out)
622 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
624 /* This function is called to swap in a RELA relocation. If an
625 external relocation corresponds to more than one internal
626 relocation, then all relocations are swapped in at once. */
627 void (*swap_reloca_in)
628 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
630 /* This function is called to swap out a RELA relocation. */
631 void (*swap_reloca_out)
632 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
635 #define elf_symbol_from(ABFD,S) \
636 (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
637 && (S)->the_bfd->tdata.elf_obj_data != 0) \
638 ? (elf_symbol_type *) (S) \
641 enum elf_reloc_type_class {
643 reloc_class_relative,
648 struct elf_reloc_cookie
650 Elf_Internal_Rela *rels, *rel, *relend;
651 Elf_Internal_Sym *locsyms;
655 struct elf_link_hash_entry **sym_hashes;
657 bfd_boolean bad_symtab;
660 /* The level of IRIX compatibility we're striving for. */
668 /* Mapping of ELF section names and types. */
669 struct bfd_elf_special_section
673 /* 0 means name must match PREFIX exactly.
674 -1 means name must start with PREFIX followed by an arbitrary string.
675 -2 means name must match PREFIX exactly or consist of PREFIX followed
676 by a dot then anything.
677 > 0 means name must start with the first PREFIX_LENGTH chars of
678 PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX. */
684 enum action_discarded
690 typedef asection * (*elf_gc_mark_hook_fn)
691 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
692 struct elf_link_hash_entry *, Elf_Internal_Sym *);
694 struct elf_backend_data
696 /* The architecture for this backend. */
697 enum bfd_architecture arch;
699 /* An identifier used to distinguish different target specific
700 extensions to elf_obj_tdata and elf_link_hash_table structures. */
701 enum elf_target_id target_id;
703 /* The ELF machine code (EM_xxxx) for this backend. */
704 int elf_machine_code;
709 /* The maximum page size for this backend. */
712 /* The minimum page size for this backend. An input object will not be
713 considered page aligned unless its sections are correctly aligned for
714 pages at least this large. May be smaller than maxpagesize. */
717 /* The common page size for this backend. */
718 bfd_vma commonpagesize;
720 /* The BFD flags applied to sections created for dynamic linking. */
721 flagword dynamic_sec_flags;
723 /* Architecture-specific data for this backend.
724 This is actually a pointer to some type like struct elf_ARCH_data. */
725 const void *arch_data;
727 /* A function to translate an ELF RELA relocation to a BFD arelent
729 void (*elf_info_to_howto)
730 (bfd *, arelent *, Elf_Internal_Rela *);
732 /* A function to translate an ELF REL relocation to a BFD arelent
734 void (*elf_info_to_howto_rel)
735 (bfd *, arelent *, Elf_Internal_Rela *);
737 /* A function to determine whether a symbol is global when
738 partitioning the symbol table into local and global symbols.
739 This should be NULL for most targets, in which case the correct
740 thing will be done. MIPS ELF, at least on the Irix 5, has
741 special requirements. */
742 bfd_boolean (*elf_backend_sym_is_global)
745 /* The remaining functions are hooks which are called only if they
748 /* A function to permit a backend specific check on whether a
749 particular BFD format is relevant for an object file, and to
750 permit the backend to set any global information it wishes. When
751 this is called elf_elfheader is set, but anything else should be
752 used with caution. If this returns FALSE, the check_format
753 routine will return a bfd_error_wrong_format error. */
754 bfd_boolean (*elf_backend_object_p)
757 /* A function to do additional symbol processing when reading the
758 ELF symbol table. This is where any processor-specific special
759 section indices are handled. */
760 void (*elf_backend_symbol_processing)
763 /* A function to do additional symbol processing after reading the
764 entire ELF symbol table. */
765 bfd_boolean (*elf_backend_symbol_table_processing)
766 (bfd *, elf_symbol_type *, unsigned int);
768 /* A function to set the type of the info field. Processor-specific
769 types should be handled here. */
770 int (*elf_backend_get_symbol_type)
771 (Elf_Internal_Sym *, int);
773 /* A function to return the linker hash table entry of a symbol that
774 might be satisfied by an archive symbol. */
775 struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
776 (bfd *, struct bfd_link_info *, const char *);
778 /* Return true if local section symbols should have a non-null st_name.
779 NULL implies false. */
780 bfd_boolean (*elf_backend_name_local_section_symbols)
783 /* A function to do additional processing on the ELF section header
784 just before writing it out. This is used to set the flags and
785 type fields for some sections, or to actually write out data for
787 bfd_boolean (*elf_backend_section_processing)
788 (bfd *, Elf_Internal_Shdr *);
790 /* A function to handle unusual section types when creating BFD
791 sections from ELF sections. */
792 bfd_boolean (*elf_backend_section_from_shdr)
793 (bfd *, Elf_Internal_Shdr *, const char *, int);
795 /* A function to convert machine dependent ELF section header flags to
796 BFD internal section header flags. */
797 bfd_boolean (*elf_backend_section_flags)
798 (flagword *, const Elf_Internal_Shdr *);
800 /* A function that returns a struct containing ELF section flags and
801 type for the given BFD section. */
802 const struct bfd_elf_special_section * (*get_sec_type_attr)
805 /* A function to handle unusual program segment types when creating BFD
806 sections from ELF program segments. */
807 bfd_boolean (*elf_backend_section_from_phdr)
808 (bfd *, Elf_Internal_Phdr *, int, const char *);
810 /* A function to set up the ELF section header for a BFD section in
811 preparation for writing it out. This is where the flags and type
812 fields are set for unusual sections. */
813 bfd_boolean (*elf_backend_fake_sections)
814 (bfd *, Elf_Internal_Shdr *, asection *);
816 /* A function to get the ELF section index for a BFD section. If
817 this returns TRUE, the section was found. If it is a normal ELF
818 section, *RETVAL should be left unchanged. If it is not a normal
819 ELF section *RETVAL should be set to the SHN_xxxx index. */
820 bfd_boolean (*elf_backend_section_from_bfd_section)
821 (bfd *, asection *, int *retval);
823 /* If this field is not NULL, it is called by the add_symbols phase
824 of a link just before adding a symbol to the global linker hash
825 table. It may modify any of the fields as it wishes. If *NAME
826 is set to NULL, the symbol will be skipped rather than being
827 added to the hash table. This function is responsible for
828 handling all processor dependent symbol bindings and section
829 indices, and must set at least *FLAGS and *SEC for each processor
830 dependent case; failure to do so will cause a link error. */
831 bfd_boolean (*elf_add_symbol_hook)
832 (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
833 const char **name, flagword *flags, asection **sec, bfd_vma *value);
835 /* If this field is not NULL, it is called by the elf_link_output_sym
836 phase of a link for each symbol which will appear in the object file.
837 On error, this function returns 0. 1 is returned when the symbol
838 should be output, 2 is returned when the symbol should be discarded. */
839 int (*elf_backend_link_output_symbol_hook)
840 (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
841 asection *, struct elf_link_hash_entry *);
843 /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
844 linker the first time it encounters a dynamic object in the link.
845 This function must create any sections required for dynamic
846 linking. The ABFD argument is a dynamic object. The .interp,
847 .dynamic, .dynsym, .dynstr, and .hash functions have already been
848 created, and this function may modify the section flags if
849 desired. This function will normally create the .got and .plt
850 sections, but different backends have different requirements. */
851 bfd_boolean (*elf_backend_create_dynamic_sections)
852 (bfd *abfd, struct bfd_link_info *info);
854 /* When creating a shared library, determine whether to omit the
855 dynamic symbol for the section. */
856 bfd_boolean (*elf_backend_omit_section_dynsym)
857 (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
859 /* Return TRUE if relocations of targets are compatible to the extent
860 that CHECK_RELOCS will properly process them. PR 4424. */
861 bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);
863 /* The CHECK_RELOCS function is called by the add_symbols phase of
864 the ELF backend linker. It is called once for each section with
865 relocs of an object file, just after the symbols for the object
866 file have been added to the global linker hash table. The
867 function must look through the relocs and do any special handling
868 required. This generally means allocating space in the global
869 offset table, and perhaps allocating space for a reloc. The
870 relocs are always passed as Rela structures; if the section
871 actually uses Rel structures, the r_addend field will always be
873 bfd_boolean (*check_relocs)
874 (bfd *abfd, struct bfd_link_info *info, asection *o,
875 const Elf_Internal_Rela *relocs);
877 /* The CHECK_DIRECTIVES function is called once per input file by
878 the add_symbols phase of the ELF backend linker. The function
879 must inspect the bfd and create any additional symbols according
880 to any custom directives in the bfd. */
881 bfd_boolean (*check_directives)
882 (bfd *abfd, struct bfd_link_info *info);
884 /* The AS_NEEDED_CLEANUP function is called once per --as-needed
885 input file that was not needed by the add_symbols phase of the
886 ELF backend linker. The function must undo any target specific
887 changes in the symbol hash table. */
888 bfd_boolean (*as_needed_cleanup)
889 (bfd *abfd, struct bfd_link_info *info);
891 /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
892 linker for every symbol which is defined by a dynamic object and
893 referenced by a regular object. This is called after all the
894 input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
895 function has been called. The hash table entry should be
896 bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
897 defined in a section from a dynamic object. Dynamic object
898 sections are not included in the final link, and this function is
899 responsible for changing the value to something which the rest of
900 the link can deal with. This will normally involve adding an
901 entry to the .plt or .got or some such section, and setting the
902 symbol to point to that. */
903 bfd_boolean (*elf_backend_adjust_dynamic_symbol)
904 (struct bfd_link_info *info, struct elf_link_hash_entry *h);
906 /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
907 after all the linker input files have been seen but before the
908 section sizes have been set. This is called after
909 ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS. */
910 bfd_boolean (*elf_backend_always_size_sections)
911 (bfd *output_bfd, struct bfd_link_info *info);
913 /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
914 linker after all the linker input files have been seen but before
915 the sections sizes have been set. This is called after
916 ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
917 It is only called when linking against a dynamic object. It must
918 set the sizes of the dynamic sections, and may fill in their
919 contents as well. The generic ELF linker can handle the .dynsym,
920 .dynstr and .hash sections. This function must handle the
921 .interp section and any sections created by the
922 CREATE_DYNAMIC_SECTIONS entry point. */
923 bfd_boolean (*elf_backend_size_dynamic_sections)
924 (bfd *output_bfd, struct bfd_link_info *info);
926 /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
927 we keep to use as a base for relocs and symbols. */
928 void (*elf_backend_init_index_section)
929 (bfd *output_bfd, struct bfd_link_info *info);
931 /* The RELOCATE_SECTION function is called by the ELF backend linker
932 to handle the relocations for a section.
934 The relocs are always passed as Rela structures; if the section
935 actually uses Rel structures, the r_addend field will always be
938 This function is responsible for adjust the section contents as
939 necessary, and (if using Rela relocs and generating a
940 relocatable output file) adjusting the reloc addend as
943 This function does not have to worry about setting the reloc
944 address or the reloc symbol index.
946 LOCAL_SYMS is a pointer to the swapped in local symbols.
948 LOCAL_SECTIONS is an array giving the section in the input file
949 corresponding to the st_shndx field of each local symbol.
951 The global hash table entry for the global symbols can be found
952 via elf_sym_hashes (input_bfd).
954 When generating relocatable output, this function must handle
955 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
956 going to be the section symbol corresponding to the output
957 section, which means that the addend must be adjusted
960 Returns FALSE on error, TRUE on success, 2 if successful and
961 relocations should be written for this section. */
962 int (*elf_backend_relocate_section)
963 (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
964 asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
965 Elf_Internal_Sym *local_syms, asection **local_sections);
967 /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
968 linker just before it writes a symbol out to the .dynsym section.
969 The processor backend may make any required adjustment to the
970 symbol. It may also take the opportunity to set contents of the
971 dynamic sections. Note that FINISH_DYNAMIC_SYMBOL is called on
972 all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
973 on those symbols which are defined by a dynamic object. */
974 bfd_boolean (*elf_backend_finish_dynamic_symbol)
975 (bfd *output_bfd, struct bfd_link_info *info,
976 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
978 /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
979 linker just before it writes all the dynamic sections out to the
980 output file. The FINISH_DYNAMIC_SYMBOL will have been called on
981 all dynamic symbols. */
982 bfd_boolean (*elf_backend_finish_dynamic_sections)
983 (bfd *output_bfd, struct bfd_link_info *info);
985 /* A function to do any beginning processing needed for the ELF file
986 before building the ELF headers and computing file positions. */
987 void (*elf_backend_begin_write_processing)
988 (bfd *, struct bfd_link_info *);
990 /* A function to do any final processing needed for the ELF file
991 before writing it out. The LINKER argument is TRUE if this BFD
992 was created by the ELF backend linker. */
993 void (*elf_backend_final_write_processing)
994 (bfd *, bfd_boolean linker);
996 /* This function is called by get_program_header_size. It should
997 return the number of additional program segments which this BFD
998 will need. It should return -1 on error. */
999 int (*elf_backend_additional_program_headers)
1000 (bfd *, struct bfd_link_info *);
1002 /* This function is called to modify an existing segment map in a
1003 backend specific fashion. */
1004 bfd_boolean (*elf_backend_modify_segment_map)
1005 (bfd *, struct bfd_link_info *);
1007 /* This function is called to modify program headers just before
1008 they are written. */
1009 bfd_boolean (*elf_backend_modify_program_headers)
1010 (bfd *, struct bfd_link_info *);
1012 /* This function is called before section garbage collection to
1013 mark entry symbol sections. */
1015 (struct bfd_link_info *);
1017 /* This function is called during section garbage collection to
1018 mark sections that define global symbols. */
1019 bfd_boolean (*gc_mark_dynamic_ref)
1020 (struct elf_link_hash_entry *, void *);
1022 /* This function is called during section gc to discover the section a
1023 particular relocation refers to. */
1024 elf_gc_mark_hook_fn gc_mark_hook;
1026 /* This function, if defined, is called after the first gc marking pass
1027 to allow the backend to mark additional sections. */
1028 bfd_boolean (*gc_mark_extra_sections)
1029 (struct bfd_link_info *, elf_gc_mark_hook_fn);
1031 /* This function, if defined, is called during the sweep phase of gc
1032 in order that a backend might update any data structures it might
1034 bfd_boolean (*gc_sweep_hook)
1035 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
1037 /* This function, if defined, is called after the ELF headers have
1038 been created. This allows for things like the OS and ABI versions
1040 void (*elf_backend_post_process_headers)
1041 (bfd *, struct bfd_link_info *);
1043 /* This function, if defined, prints a symbol to file and returns the
1044 name of the symbol to be printed. It should return NULL to fall
1045 back to default symbol printing. */
1046 const char *(*elf_backend_print_symbol_all)
1047 (bfd *, void *, asymbol *);
1049 /* This function, if defined, is called after all local symbols and
1050 global symbols converted to locals are emitted into the symtab
1051 section. It allows the backend to emit special local symbols
1052 not handled in the hash table. */
1053 bfd_boolean (*elf_backend_output_arch_local_syms)
1054 (bfd *, struct bfd_link_info *, void *,
1055 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1056 struct elf_link_hash_entry *));
1058 /* This function, if defined, is called after all symbols are emitted
1059 into the symtab section. It allows the backend to emit special
1060 global symbols not handled in the hash table. */
1061 bfd_boolean (*elf_backend_output_arch_syms)
1062 (bfd *, struct bfd_link_info *, void *,
1063 bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
1064 struct elf_link_hash_entry *));
1066 /* Copy any information related to dynamic linking from a pre-existing
1067 symbol to a newly created symbol. Also called to copy flags and
1068 other back-end info to a weakdef, in which case the symbol is not
1069 newly created and plt/got refcounts and dynamic indices should not
1071 void (*elf_backend_copy_indirect_symbol)
1072 (struct bfd_link_info *, struct elf_link_hash_entry *,
1073 struct elf_link_hash_entry *);
1075 /* Modify any information related to dynamic linking such that the
1076 symbol is not exported. */
1077 void (*elf_backend_hide_symbol)
1078 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1080 /* A function to do additional symbol fixup, called by
1081 _bfd_elf_fix_symbol_flags. */
1082 bfd_boolean (*elf_backend_fixup_symbol)
1083 (struct bfd_link_info *, struct elf_link_hash_entry *);
1085 /* Merge the backend specific symbol attribute. */
1086 void (*elf_backend_merge_symbol_attribute)
1087 (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
1090 /* This function, if defined, will return a string containing the
1091 name of a target-specific dynamic tag. */
1092 char *(*elf_backend_get_target_dtag)
1095 /* Decide whether an undefined symbol is special and can be ignored.
1096 This is the case for OPTIONAL symbols on IRIX. */
1097 bfd_boolean (*elf_backend_ignore_undef_symbol)
1098 (struct elf_link_hash_entry *);
1100 /* Emit relocations. Overrides default routine for emitting relocs,
1101 except during a relocatable link, or if all relocs are being emitted. */
1102 bfd_boolean (*elf_backend_emit_relocs)
1103 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1104 struct elf_link_hash_entry **);
1106 /* Count relocations. Not called for relocatable links
1107 or if all relocs are being preserved in the output. */
1108 unsigned int (*elf_backend_count_relocs)
1109 (struct bfd_link_info *, asection *);
1111 /* This function, if defined, is called when an NT_PRSTATUS note is found
1113 bfd_boolean (*elf_backend_grok_prstatus)
1114 (bfd *, Elf_Internal_Note *);
1116 /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
1117 note is found in a core file. */
1118 bfd_boolean (*elf_backend_grok_psinfo)
1119 (bfd *, Elf_Internal_Note *);
1121 /* This function, if defined, is called to write a note to a corefile. */
1122 char *(*elf_backend_write_core_note)
1123 (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
1125 /* This function, if defined, is called to convert target-specific
1126 section flag names into hex values. */
1127 flagword (*elf_backend_lookup_section_flags_hook)
1130 /* This function returns class of a reloc type. */
1131 enum elf_reloc_type_class (*elf_backend_reloc_type_class)
1132 (const Elf_Internal_Rela *);
1134 /* This function, if defined, removes information about discarded functions
1135 from other sections which mention them. */
1136 bfd_boolean (*elf_backend_discard_info)
1137 (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
1139 /* This function, if defined, signals that the function above has removed
1140 the discarded relocations for this section. */
1141 bfd_boolean (*elf_backend_ignore_discarded_relocs)
1144 /* What to do when ld finds relocations against symbols defined in
1145 discarded sections. */
1146 unsigned int (*action_discarded)
1149 /* This function returns the width of FDE pointers in bytes, or 0 if
1150 that can't be determined for some reason. The default definition
1151 goes by the bfd's EI_CLASS. */
1152 unsigned int (*elf_backend_eh_frame_address_size)
1153 (bfd *, asection *);
1155 /* These functions tell elf-eh-frame whether to attempt to turn
1156 absolute or lsda encodings into pc-relative ones. The default
1157 definition enables these transformations. */
1158 bfd_boolean (*elf_backend_can_make_relative_eh_frame)
1159 (bfd *, struct bfd_link_info *, asection *);
1160 bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
1161 (bfd *, struct bfd_link_info *, asection *);
1163 /* This function returns an encoding after computing the encoded
1164 value (and storing it in ENCODED) for the given OFFSET into OSEC,
1165 to be stored in at LOC_OFFSET into the LOC_SEC input section.
1166 The default definition chooses a 32-bit PC-relative encoding. */
1167 bfd_byte (*elf_backend_encode_eh_address)
1168 (bfd *abfd, struct bfd_link_info *info,
1169 asection *osec, bfd_vma offset,
1170 asection *loc_sec, bfd_vma loc_offset,
1173 /* This function, if defined, may write out the given section.
1174 Returns TRUE if it did so and FALSE if the caller should. */
1175 bfd_boolean (*elf_backend_write_section)
1176 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1178 /* The level of IRIX compatibility we're striving for.
1179 MIPS ELF specific function. */
1180 irix_compat_t (*elf_backend_mips_irix_compat)
1183 reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
1184 (unsigned int, bfd_boolean);
1186 /* The swapping table to use when dealing with ECOFF information.
1187 Used for the MIPS ELF .mdebug section. */
1188 const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
1190 /* This function implements `bfd_elf_bfd_from_remote_memory';
1191 see elf.c, elfcode.h. */
1192 bfd *(*elf_backend_bfd_from_remote_memory)
1193 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1194 int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
1195 bfd_size_type len));
1197 /* This function is used by `_bfd_elf_get_synthetic_symtab';
1199 bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1201 /* Is symbol defined in common section? */
1202 bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1204 /* Return a common section index for section. */
1205 unsigned int (*common_section_index) (asection *);
1207 /* Return a common section for section. */
1208 asection *(*common_section) (asection *);
1210 /* Return TRUE if we can merge 2 definitions. */
1211 bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1212 struct elf_link_hash_entry **,
1213 struct elf_link_hash_entry *,
1214 Elf_Internal_Sym *, asection **,
1215 bfd_vma *, unsigned int *,
1216 bfd_boolean *, bfd_boolean *,
1217 bfd_boolean *, bfd_boolean *,
1218 bfd_boolean *, bfd_boolean *,
1219 bfd_boolean *, bfd_boolean *,
1221 bfd_boolean *, bfd_boolean *,
1222 bfd_boolean *, bfd_boolean *,
1223 bfd *, asection **);
1225 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1226 bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
1228 /* Return TRUE if type is a function symbol type. */
1229 bfd_boolean (*is_function_type) (unsigned int type);
1231 /* If the ELF symbol SYM might be a function in SEC, return the
1232 function size and set *CODE_OFF to the function's entry point,
1233 otherwise return zero. */
1234 bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
1237 /* Used to handle bad SHF_LINK_ORDER input. */
1238 bfd_error_handler_type link_order_error_handler;
1240 /* Name of the PLT relocation section. */
1241 const char *relplt_name;
1243 /* Alternate EM_xxxx machine codes for this backend. */
1244 int elf_machine_alt1;
1245 int elf_machine_alt2;
1247 const struct elf_size_info *s;
1249 /* An array of target specific special sections. */
1250 const struct bfd_elf_special_section *special_sections;
1252 /* The size in bytes of the header for the GOT. This includes the
1253 so-called reserved entries on some systems. */
1254 bfd_vma got_header_size;
1256 /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
1257 otherwise by the local symbol with index SYMNDX in IBFD. */
1258 bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
1259 struct elf_link_hash_entry *h,
1260 bfd *ibfd, unsigned long symndx);
1262 /* The vendor name to use for a processor-standard attributes section. */
1263 const char *obj_attrs_vendor;
1265 /* The section name to use for a processor-standard attributes section. */
1266 const char *obj_attrs_section;
1268 /* Return 1, 2 or 3 to indicate what type of arguments a
1269 processor-specific tag takes. */
1270 int (*obj_attrs_arg_type) (int);
1272 /* The section type to use for an attributes section. */
1273 unsigned int obj_attrs_section_type;
1275 /* This function determines the order in which any attributes are
1276 written. It must be defined for input in the range
1277 LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
1278 is used in order to make unity easy). The returned value is the
1279 actual tag number to place in the input position. */
1280 int (*obj_attrs_order) (int);
1282 /* Handle merging unknown attributes; either warn and return TRUE,
1283 or give an error and return FALSE. */
1284 bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);
1286 /* This is non-zero if static TLS segments require a special alignment. */
1287 unsigned static_tls_alignment;
1289 /* Alignment for the PT_GNU_STACK segment. */
1290 unsigned stack_align;
1292 /* This is TRUE if the linker should act like collect and gather
1293 global constructors and destructors by name. This is TRUE for
1294 MIPS ELF because the Irix 5 tools can not handle the .init
1296 unsigned collect : 1;
1298 /* This is TRUE if the linker should ignore changes to the type of a
1299 symbol. This is TRUE for MIPS ELF because some Irix 5 objects
1300 record undefined functions as STT_OBJECT although the definitions
1302 unsigned type_change_ok : 1;
1304 /* Whether the backend may use REL relocations. (Some backends use
1305 both REL and RELA relocations, and this flag is set for those
1307 unsigned may_use_rel_p : 1;
1309 /* Whether the backend may use RELA relocations. (Some backends use
1310 both REL and RELA relocations, and this flag is set for those
1312 unsigned may_use_rela_p : 1;
1314 /* Whether the default relocation type is RELA. If a backend with
1315 this flag set wants REL relocations for a particular section,
1316 it must note that explicitly. Similarly, if this flag is clear,
1317 and the backend wants RELA relocations for a particular
1319 unsigned default_use_rela_p : 1;
1321 /* True if PLT and copy relocations should be RELA by default. */
1322 unsigned rela_plts_and_copies_p : 1;
1324 /* Set if RELA relocations for a relocatable link can be handled by
1325 generic code. Backends that set this flag need do nothing in the
1326 backend relocate_section routine for relocatable linking. */
1327 unsigned rela_normal : 1;
1329 /* TRUE if addresses "naturally" sign extend. This is used when
1330 swapping in from Elf32 when BFD64. */
1331 unsigned sign_extend_vma : 1;
1333 unsigned want_got_plt : 1;
1334 unsigned plt_readonly : 1;
1335 unsigned want_plt_sym : 1;
1336 unsigned plt_not_loaded : 1;
1337 unsigned plt_alignment : 4;
1338 unsigned can_gc_sections : 1;
1339 unsigned can_refcount : 1;
1340 unsigned want_got_sym : 1;
1341 unsigned want_dynbss : 1;
1343 /* Targets which do not support physical addressing often require
1344 that the p_paddr field in the section header to be set to zero.
1345 This field indicates whether this behavior is required. */
1346 unsigned want_p_paddr_set_to_zero : 1;
1348 /* True if an object file lacking a .note.GNU-stack section
1349 should be assumed to be requesting exec stack. At least one
1350 other file in the link needs to have a .note.GNU-stack section
1351 for a PT_GNU_STACK segment to be created. */
1352 unsigned default_execstack : 1;
1355 /* Information about reloc sections associated with a bfd_elf_section_data
1357 struct bfd_elf_section_reloc_data
1359 /* The ELF header for the reloc section associated with this
1361 Elf_Internal_Shdr *hdr;
1362 /* The number of relocations currently assigned to HDR. */
1364 /* The ELF section number of the reloc section. Only used for an
1367 /* Used by the backend linker to store the symbol hash table entries
1368 associated with relocs against global symbols. */
1369 struct elf_link_hash_entry **hashes;
1372 /* Information stored for each BFD section in an ELF file. This
1373 structure is allocated by elf_new_section_hook. */
1375 struct bfd_elf_section_data
1377 /* The ELF header for this section. */
1378 Elf_Internal_Shdr this_hdr;
1380 /* INPUT_SECTION_FLAGS if specified in the linker script. */
1381 struct flag_info *section_flag_info;
1383 /* Information about the REL and RELA reloc sections associated
1384 with this section, if any. */
1385 struct bfd_elf_section_reloc_data rel, rela;
1387 /* The ELF section number of this section. */
1390 /* Used by the backend linker when generating a shared library to
1391 record the dynamic symbol index for a section symbol
1392 corresponding to this section. A value of 0 means that there is
1393 no dynamic symbol for this section. */
1396 /* A pointer to the linked-to section for SHF_LINK_ORDER. */
1397 asection *linked_to;
1399 /* A pointer to the swapped relocs. If the section uses REL relocs,
1400 rather than RELA, all the r_addend fields will be zero. This
1401 pointer may be NULL. It is used by the backend linker. */
1402 Elf_Internal_Rela *relocs;
1404 /* A pointer to a linked list tracking dynamic relocs copied for
1408 /* A pointer to the bfd section used for dynamic relocs. */
1412 /* Group name, if this section is a member of a group. */
1415 /* Group signature sym, if this is the SHT_GROUP section. */
1416 struct bfd_symbol *id;
1419 /* For a member of a group, points to the SHT_GROUP section.
1420 NULL for the SHT_GROUP section itself and non-group sections. */
1421 asection *sec_group;
1423 /* A linked list of member sections in the group. Circular when used by
1424 the linker. For the SHT_GROUP section, points at first member. */
1425 asection *next_in_group;
1427 /* The FDEs associated with this section. The u.fde.next_in_section
1428 field acts as a chain pointer. */
1429 struct eh_cie_fde *fde_list;
1431 /* A pointer used for various section optimizations. */
1435 #define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1436 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1437 #define elf_section_type(sec) (elf_section_data(sec)->this_hdr.sh_type)
1438 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1439 #define elf_group_name(sec) (elf_section_data(sec)->group.name)
1440 #define elf_group_id(sec) (elf_section_data(sec)->group.id)
1441 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1442 #define elf_fde_list(sec) (elf_section_data(sec)->fde_list)
1443 #define elf_sec_group(sec) (elf_section_data(sec)->sec_group)
1445 #define xvec_get_elf_backend_data(xvec) \
1446 ((const struct elf_backend_data *) (xvec)->backend_data)
1448 #define get_elf_backend_data(abfd) \
1449 xvec_get_elf_backend_data ((abfd)->xvec)
1451 /* The least object attributes (within an attributes subsection) known
1452 for any target. Some code assumes that the value 0 is not used and
1453 the field for that attribute can instead be used as a marker to
1454 indicate that attributes have been initialized. */
1455 #define LEAST_KNOWN_OBJ_ATTRIBUTE 2
1457 /* The maximum number of known object attributes for any target. */
1458 #define NUM_KNOWN_OBJ_ATTRIBUTES 71
1460 /* The value of an object attribute. The type indicates whether the attribute
1461 holds and integer, a string, or both. It can also indicate that there can
1462 be no default (i.e. all values must be written to file, even zero). */
1464 typedef struct obj_attribute
1466 #define ATTR_TYPE_FLAG_INT_VAL (1 << 0)
1467 #define ATTR_TYPE_FLAG_STR_VAL (1 << 1)
1468 #define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)
1470 #define ATTR_TYPE_HAS_INT_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
1471 #define ATTR_TYPE_HAS_STR_VAL(TYPE) ((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
1472 #define ATTR_TYPE_HAS_NO_DEFAULT(TYPE) ((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)
1479 typedef struct obj_attribute_list
1481 struct obj_attribute_list *next;
1484 } obj_attribute_list;
1486 /* Object attributes may either be defined by the processor ABI, index
1487 OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
1488 (and possibly also processor-specific), index OBJ_ATTR_GNU. */
1489 #define OBJ_ATTR_PROC 0
1490 #define OBJ_ATTR_GNU 1
1491 #define OBJ_ATTR_FIRST OBJ_ATTR_PROC
1492 #define OBJ_ATTR_LAST OBJ_ATTR_GNU
1494 /* The following object attribute tags are taken as generic, for all
1495 targets and for "gnu" where there is no target standard. */
1502 Tag_compatibility = 32
1505 /* The following struct stores information about every SystemTap section
1506 found in the object file. */
1509 struct sdt_note *next;
1514 /* Some private data is stashed away for future use using the tdata pointer
1515 in the bfd structure. */
1517 struct elf_obj_tdata
1519 Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */
1520 Elf_Internal_Shdr **elf_sect_ptr;
1521 Elf_Internal_Phdr *phdr;
1522 struct elf_segment_map *segment_map;
1523 struct elf_strtab_hash *strtab_ptr;
1526 unsigned int num_elf_sections; /* elf_sect_ptr size */
1527 int num_section_syms;
1528 asymbol **section_syms; /* STT_SECTION symbols for each section */
1529 Elf_Internal_Shdr symtab_hdr;
1530 Elf_Internal_Shdr shstrtab_hdr;
1531 Elf_Internal_Shdr strtab_hdr;
1532 Elf_Internal_Shdr dynsymtab_hdr;
1533 Elf_Internal_Shdr dynstrtab_hdr;
1534 Elf_Internal_Shdr dynversym_hdr;
1535 Elf_Internal_Shdr dynverref_hdr;
1536 Elf_Internal_Shdr dynverdef_hdr;
1537 Elf_Internal_Shdr symtab_shndx_hdr;
1538 unsigned int symtab_section, shstrtab_section;
1539 unsigned int strtab_section, dynsymtab_section;
1540 unsigned int symtab_shndx_section;
1541 unsigned int dynversym_section, dynverdef_section, dynverref_section;
1542 file_ptr next_file_pos;
1543 bfd_vma gp; /* The gp value */
1544 unsigned int gp_size; /* The gp size */
1546 /* Information grabbed from an elf core file. */
1553 /* A mapping from external symbols to entries in the linker hash
1554 table, used when linking. This is indexed by the symbol index
1555 minus the sh_info field of the symbol table header. */
1556 struct elf_link_hash_entry **sym_hashes;
1558 /* Track usage and final offsets of GOT entries for local symbols.
1559 This array is indexed by symbol index. Elements are used
1560 identically to "got" in struct elf_link_hash_entry. */
1563 bfd_signed_vma *refcounts;
1565 struct got_entry **ents;
1568 /* The linker ELF emulation code needs to let the backend ELF linker
1569 know what filename should be used for a dynamic object if the
1570 dynamic object is found using a search. The emulation code then
1571 sometimes needs to know what name was actually used. Until the
1572 file has been added to the linker symbol table, this field holds
1573 the name the linker wants. After it has been added, it holds the
1574 name actually used, which will be the DT_SONAME entry if there is
1576 const char *dt_name;
1578 /* The linker emulation needs to know what audit libs
1579 are used by a dynamic object. */
1580 const char *dt_audit;
1582 /* Records the result of `get_program_header_size'. */
1583 bfd_size_type program_header_size;
1585 /* Used by find_nearest_line entry point. */
1588 /* Used by MIPS ELF find_nearest_line entry point. The structure
1589 could be included directly in this one, but there's no point to
1590 wasting the memory just for the infrequently called
1591 find_nearest_line. */
1592 struct mips_elf_find_line *find_line_info;
1594 /* A place to stash dwarf1 info for this bfd. */
1595 struct dwarf1_debug *dwarf1_find_line_info;
1597 /* A place to stash dwarf2 info for this bfd. */
1598 void *dwarf2_find_line_info;
1600 /* An array of stub sections indexed by symbol number, used by the
1601 MIPS ELF linker. FIXME: We should figure out some way to only
1602 include this field for a MIPS ELF target. */
1603 asection **local_stubs;
1604 asection **local_call_stubs;
1606 /* Used to determine if PT_GNU_EH_FRAME segment header should be
1608 asection *eh_frame_hdr;
1610 Elf_Internal_Shdr **group_sect_ptr;
1613 /* Number of symbol version definitions we are about to emit. */
1614 unsigned int cverdefs;
1616 /* Number of symbol version references we are about to emit. */
1617 unsigned int cverrefs;
1619 /* Segment flags for the PT_GNU_STACK segment. */
1620 unsigned int stack_flags;
1622 /* Symbol version definitions in external objects. */
1623 Elf_Internal_Verdef *verdef;
1625 /* Symbol version references to external objects. */
1626 Elf_Internal_Verneed *verref;
1628 /* The Irix 5 support uses two virtual sections, which represent
1629 text/data symbols defined in dynamic objects. */
1630 asymbol *elf_data_symbol;
1631 asymbol *elf_text_symbol;
1632 asection *elf_data_section;
1633 asection *elf_text_section;
1635 /* A pointer to the .eh_frame section. */
1636 asection *eh_frame_section;
1638 /* Whether a dyanmic object was specified normally on the linker
1639 command line, or was specified when --as-needed was in effect,
1640 or was found via a DT_NEEDED entry. */
1641 enum dynamic_lib_link_class dyn_lib_class;
1643 /* This is set to TRUE if the object was created by the backend
1647 /* Irix 5 often screws up the symbol table, sorting local symbols
1648 after global symbols. This flag is set if the symbol table in
1649 this BFD appears to be screwed up. If it is, we ignore the
1650 sh_info field in the symbol table header, and always read all the
1652 bfd_boolean bad_symtab;
1654 /* Used to determine if the e_flags field has been initialized */
1655 bfd_boolean flags_init;
1657 /* Symbol buffer. */
1660 obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
1661 obj_attribute_list *other_obj_attributes[2];
1663 /* Called at the end of _bfd_elf_write_object_contents if not NULL. */
1664 bfd_boolean (*after_write_object_contents) (bfd *);
1665 void *after_write_object_contents_info;
1667 /* NT_GNU_BUILD_ID note type. */
1668 bfd_size_type build_id_size;
1671 /* Linked-list containing information about every Systemtap section
1672 found in the object file. Each section corresponds to one entry
1674 struct sdt_note *sdt_note_head;
1676 /* True if the bfd contains symbols that have the STT_GNU_IFUNC
1677 symbol type or STB_GNU_UNIQUE binding. Used to set the osabi
1678 field in the ELF header structure. */
1679 bfd_boolean has_gnu_symbols;
1681 /* An identifier used to distinguish different target
1682 specific extensions to this structure. */
1683 enum elf_target_id object_id;
1686 #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data)
1688 #define elf_object_id(bfd) (elf_tdata(bfd) -> object_id)
1689 #define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
1690 #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header)
1691 #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr)
1692 #define elf_numsections(bfd) (elf_tdata(bfd) -> num_elf_sections)
1693 #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr)
1694 #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
1695 #define elf_symtab_shndx(bfd) (elf_tdata(bfd) -> symtab_shndx_section)
1696 #define elf_symtab_hdr(bfd) (elf_tdata(bfd) -> symtab_hdr)
1697 #define elf_dynsymtab(bfd) (elf_tdata(bfd) -> dynsymtab_section)
1698 #define elf_dynversym(bfd) (elf_tdata(bfd) -> dynversym_section)
1699 #define elf_dynverdef(bfd) (elf_tdata(bfd) -> dynverdef_section)
1700 #define elf_dynverref(bfd) (elf_tdata(bfd) -> dynverref_section)
1701 #define elf_eh_frame_section(bfd) \
1702 (elf_tdata(bfd) -> eh_frame_section)
1703 #define elf_num_locals(bfd) (elf_tdata(bfd) -> num_locals)
1704 #define elf_num_globals(bfd) (elf_tdata(bfd) -> num_globals)
1705 #define elf_section_syms(bfd) (elf_tdata(bfd) -> section_syms)
1706 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1707 #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo)
1708 #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus)
1709 #define elf_gp(bfd) (elf_tdata(bfd) -> gp)
1710 #define elf_gp_size(bfd) (elf_tdata(bfd) -> gp_size)
1711 #define elf_sym_hashes(bfd) (elf_tdata(bfd) -> sym_hashes)
1712 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1713 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1714 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1715 #define elf_dt_name(bfd) (elf_tdata(bfd) -> dt_name)
1716 #define elf_dt_audit(bfd) (elf_tdata(bfd) -> dt_audit)
1717 #define elf_dyn_lib_class(bfd) (elf_tdata(bfd) -> dyn_lib_class)
1718 #define elf_bad_symtab(bfd) (elf_tdata(bfd) -> bad_symtab)
1719 #define elf_flags_init(bfd) (elf_tdata(bfd) -> flags_init)
1720 #define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
1721 #define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
1722 #define elf_known_obj_attributes_proc(bfd) \
1723 (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
1724 #define elf_other_obj_attributes_proc(bfd) \
1725 (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])
1727 extern void _bfd_elf_swap_verdef_in
1728 (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1729 extern void _bfd_elf_swap_verdef_out
1730 (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1731 extern void _bfd_elf_swap_verdaux_in
1732 (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1733 extern void _bfd_elf_swap_verdaux_out
1734 (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1735 extern void _bfd_elf_swap_verneed_in
1736 (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1737 extern void _bfd_elf_swap_verneed_out
1738 (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1739 extern void _bfd_elf_swap_vernaux_in
1740 (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1741 extern void _bfd_elf_swap_vernaux_out
1742 (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1743 extern void _bfd_elf_swap_versym_in
1744 (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1745 extern void _bfd_elf_swap_versym_out
1746 (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1748 extern unsigned int _bfd_elf_section_from_bfd_section
1749 (bfd *, asection *);
1750 extern char *bfd_elf_string_from_elf_section
1751 (bfd *, unsigned, unsigned);
1752 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1753 (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1754 Elf_External_Sym_Shndx *);
1755 extern const char *bfd_elf_sym_name
1756 (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1758 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1760 extern bfd_boolean _bfd_elf_print_private_bfd_data
1762 extern void bfd_elf_print_symbol
1763 (bfd *, void *, asymbol *, bfd_print_symbol_type);
1765 extern unsigned int _bfd_elf_eh_frame_address_size
1766 (bfd *, asection *);
1767 extern bfd_byte _bfd_elf_encode_eh_address
1768 (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1769 asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1770 extern bfd_boolean _bfd_elf_can_make_relative
1771 (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1773 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1774 (const Elf_Internal_Rela *);
1775 extern bfd_vma _bfd_elf_rela_local_sym
1776 (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1777 extern bfd_vma _bfd_elf_rel_local_sym
1778 (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1779 extern bfd_vma _bfd_elf_section_offset
1780 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1782 extern unsigned long bfd_elf_hash
1784 extern unsigned long bfd_elf_gnu_hash
1787 extern bfd_reloc_status_type bfd_elf_generic_reloc
1788 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1789 extern bfd_boolean bfd_elf_allocate_object
1790 (bfd *, size_t, enum elf_target_id);
1791 extern bfd_boolean bfd_elf_make_object
1793 extern bfd_boolean bfd_elf_mkcorefile
1795 extern bfd_boolean _bfd_elf_make_section_from_shdr
1796 (bfd *, Elf_Internal_Shdr *, const char *, int);
1797 extern bfd_boolean _bfd_elf_make_section_from_phdr
1798 (bfd *, Elf_Internal_Phdr *, int, const char *);
1799 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1800 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1801 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1803 extern void _bfd_elf_link_hash_copy_indirect
1804 (struct bfd_link_info *, struct elf_link_hash_entry *,
1805 struct elf_link_hash_entry *);
1806 extern void _bfd_elf_link_hash_hide_symbol
1807 (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1808 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1809 (struct bfd_link_info *, struct elf_link_hash_entry *);
1810 extern bfd_boolean _bfd_elf_link_hash_table_init
1811 (struct elf_link_hash_table *, bfd *,
1812 struct bfd_hash_entry *(*)
1813 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1814 unsigned int, enum elf_target_id);
1815 extern bfd_boolean _bfd_elf_slurp_version_tables
1816 (bfd *, bfd_boolean);
1817 extern bfd_boolean _bfd_elf_merge_sections
1818 (bfd *, struct bfd_link_info *);
1819 extern bfd_boolean _bfd_elf_match_sections_by_type
1820 (bfd *, const asection *, bfd *, const asection *);
1821 extern bfd_boolean bfd_elf_is_group_section
1822 (bfd *, const struct bfd_section *);
1823 extern bfd_boolean _bfd_elf_section_already_linked
1824 (bfd *, asection *, struct bfd_link_info *);
1825 extern void bfd_elf_set_group_contents
1826 (bfd *, asection *, void *);
1827 extern asection *_bfd_elf_check_kept_section
1828 (asection *, struct bfd_link_info *);
1829 #define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
1830 extern void _bfd_elf_copy_link_hash_symbol_type
1831 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
1832 extern bfd_boolean _bfd_elf_size_group_sections
1833 (struct bfd_link_info *);
1834 extern bfd_boolean _bfd_elf_fixup_group_sections
1835 (bfd *, asection *);
1836 extern bfd_boolean _bfd_elf_copy_private_header_data
1838 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1839 (bfd *, asymbol *, bfd *, asymbol *);
1840 #define _bfd_generic_init_private_section_data \
1841 _bfd_elf_init_private_section_data
1842 extern bfd_boolean _bfd_elf_init_private_section_data
1843 (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1844 extern bfd_boolean _bfd_elf_copy_private_section_data
1845 (bfd *, asection *, bfd *, asection *);
1846 extern bfd_boolean _bfd_elf_write_object_contents
1848 extern bfd_boolean _bfd_elf_write_corefile_contents
1850 extern bfd_boolean _bfd_elf_set_section_contents
1851 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1852 extern long _bfd_elf_get_symtab_upper_bound
1854 extern long _bfd_elf_canonicalize_symtab
1855 (bfd *, asymbol **);
1856 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1858 extern long _bfd_elf_canonicalize_dynamic_symtab
1859 (bfd *, asymbol **);
1860 extern long _bfd_elf_get_synthetic_symtab
1861 (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1862 extern long _bfd_elf_get_reloc_upper_bound
1864 extern long _bfd_elf_canonicalize_reloc
1865 (bfd *, sec_ptr, arelent **, asymbol **);
1866 extern asection * _bfd_elf_get_dynamic_reloc_section
1867 (bfd *, asection *, bfd_boolean);
1868 extern asection * _bfd_elf_make_dynamic_reloc_section
1869 (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
1870 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1872 extern long _bfd_elf_canonicalize_dynamic_reloc
1873 (bfd *, arelent **, asymbol **);
1874 extern asymbol *_bfd_elf_make_empty_symbol
1876 extern void _bfd_elf_get_symbol_info
1877 (bfd *, asymbol *, symbol_info *);
1878 extern bfd_boolean _bfd_elf_is_local_label_name
1879 (bfd *, const char *);
1880 extern alent *_bfd_elf_get_lineno
1882 extern bfd_boolean _bfd_elf_set_arch_mach
1883 (bfd *, enum bfd_architecture, unsigned long);
1884 extern bfd_boolean _bfd_elf_find_nearest_line
1885 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1887 extern bfd_boolean _bfd_elf_find_nearest_line_discriminator
1888 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1889 unsigned int *, unsigned int *);
1890 extern bfd_boolean _bfd_elf_find_line
1891 (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1892 extern bfd_boolean _bfd_elf_find_line_discriminator
1893 (bfd *, asymbol **, asymbol *, const char **, unsigned int *, unsigned int *);
1894 #define _bfd_generic_find_line _bfd_elf_find_line
1895 #define _bfd_generic_find_nearest_line_discriminator \
1896 _bfd_elf_find_nearest_line_discriminator
1897 extern bfd_boolean _bfd_elf_find_inliner_info
1898 (bfd *, const char **, const char **, unsigned int *);
1899 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1900 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1901 extern int _bfd_elf_sizeof_headers
1902 (bfd *, struct bfd_link_info *);
1903 extern bfd_boolean _bfd_elf_new_section_hook
1904 (bfd *, asection *);
1905 extern bfd_boolean _bfd_elf_init_reloc_shdr
1906 (bfd *, struct bfd_elf_section_reloc_data *, asection *, bfd_boolean);
1907 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1908 (const char *, const struct bfd_elf_special_section *, unsigned int);
1909 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1910 (bfd *, asection *);
1912 /* If the target doesn't have reloc handling written yet: */
1913 extern void _bfd_elf_no_info_to_howto
1914 (bfd *, arelent *, Elf_Internal_Rela *);
1916 extern bfd_boolean bfd_section_from_shdr
1917 (bfd *, unsigned int shindex);
1918 extern bfd_boolean bfd_section_from_phdr
1919 (bfd *, Elf_Internal_Phdr *, int);
1921 extern int _bfd_elf_symbol_from_bfd_symbol
1922 (bfd *, asymbol **);
1924 extern Elf_Internal_Sym *bfd_sym_from_r_symndx
1925 (struct sym_cache *, bfd *, unsigned long);
1926 extern asection *bfd_section_from_elf_index
1927 (bfd *, unsigned int);
1928 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1931 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1933 extern void _bfd_elf_strtab_free
1934 (struct elf_strtab_hash *);
1935 extern bfd_size_type _bfd_elf_strtab_add
1936 (struct elf_strtab_hash *, const char *, bfd_boolean);
1937 extern void _bfd_elf_strtab_addref
1938 (struct elf_strtab_hash *, bfd_size_type);
1939 extern void _bfd_elf_strtab_delref
1940 (struct elf_strtab_hash *, bfd_size_type);
1941 extern unsigned int _bfd_elf_strtab_refcount
1942 (struct elf_strtab_hash *, bfd_size_type);
1943 extern void _bfd_elf_strtab_clear_refs
1944 (struct elf_strtab_hash *, bfd_size_type);
1945 #define _bfd_elf_strtab_clear_all_refs(tab) \
1946 do { _bfd_elf_strtab_clear_refs (tab, 1); } while (0)
1947 extern bfd_size_type _bfd_elf_strtab_size
1948 (struct elf_strtab_hash *);
1949 extern bfd_size_type _bfd_elf_strtab_offset
1950 (struct elf_strtab_hash *, bfd_size_type);
1951 extern bfd_boolean _bfd_elf_strtab_emit
1952 (bfd *, struct elf_strtab_hash *);
1953 extern void _bfd_elf_strtab_finalize
1954 (struct elf_strtab_hash *);
1956 extern void _bfd_elf_begin_eh_frame_parsing
1957 (struct bfd_link_info *info);
1958 extern void _bfd_elf_parse_eh_frame
1959 (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
1960 extern void _bfd_elf_end_eh_frame_parsing
1961 (struct bfd_link_info *info);
1963 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1964 (bfd *, struct bfd_link_info *, asection *,
1965 bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1966 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1967 (bfd *, struct bfd_link_info *);
1968 extern bfd_vma _bfd_elf_eh_frame_section_offset
1969 (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1970 extern bfd_boolean _bfd_elf_write_section_eh_frame
1971 (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1972 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1973 (bfd *, struct bfd_link_info *);
1974 extern bfd_boolean _bfd_elf_eh_frame_present
1975 (struct bfd_link_info *);
1976 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1977 (struct bfd_link_info *);
1979 extern bfd_boolean _bfd_elf_merge_symbol
1980 (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1981 asection **, bfd_vma *, bfd_boolean *, unsigned int *,
1982 struct elf_link_hash_entry **, bfd_boolean *,
1983 bfd_boolean *, bfd_boolean *, bfd_boolean *);
1985 extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
1987 extern long _bfd_elf_link_lookup_local_dynindx
1988 (struct bfd_link_info *, bfd *, long);
1989 extern bfd_boolean _bfd_elf_compute_section_file_positions
1990 (bfd *, struct bfd_link_info *);
1991 extern void _bfd_elf_assign_file_positions_for_relocs
1993 extern file_ptr _bfd_elf_assign_file_position_for_section
1994 (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1996 extern bfd_boolean _bfd_elf_validate_reloc
1999 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
2000 (bfd *, struct bfd_link_info *);
2001 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
2002 (bfd *, struct bfd_link_info *, asection *);
2003 extern bfd_boolean _bfd_elf_create_dynamic_sections
2004 (bfd *, struct bfd_link_info *);
2005 extern bfd_boolean _bfd_elf_create_got_section
2006 (bfd *, struct bfd_link_info *);
2007 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
2008 (bfd *, struct bfd_link_info *, asection *, const char *);
2009 extern void _bfd_elf_init_1_index_section
2010 (bfd *, struct bfd_link_info *);
2011 extern void _bfd_elf_init_2_index_sections
2012 (bfd *, struct bfd_link_info *);
2014 extern bfd_boolean _bfd_elfcore_make_pseudosection
2015 (bfd *, char *, size_t, ufile_ptr);
2016 extern char *_bfd_elfcore_strndup
2017 (bfd *, char *, size_t);
2019 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
2020 (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
2022 extern bfd_boolean _bfd_elf_link_output_relocs
2023 (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
2024 struct elf_link_hash_entry **);
2026 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
2027 (struct elf_link_hash_entry *, asection *);
2029 extern bfd_boolean _bfd_elf_dynamic_symbol_p
2030 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2032 extern bfd_boolean _bfd_elf_symbol_refs_local_p
2033 (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
2035 extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
2036 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);
2038 extern bfd_boolean _bfd_elf_setup_sections
2041 extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);
2043 extern const bfd_target *bfd_elf32_object_p
2045 extern const bfd_target *bfd_elf32_core_file_p
2047 extern char *bfd_elf32_core_file_failing_command
2049 extern int bfd_elf32_core_file_failing_signal
2051 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
2053 extern int bfd_elf32_core_file_pid
2056 extern bfd_boolean bfd_elf32_swap_symbol_in
2057 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2058 extern void bfd_elf32_swap_symbol_out
2059 (bfd *, const Elf_Internal_Sym *, void *, void *);
2060 extern void bfd_elf32_swap_reloc_in
2061 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2062 extern void bfd_elf32_swap_reloc_out
2063 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2064 extern void bfd_elf32_swap_reloca_in
2065 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2066 extern void bfd_elf32_swap_reloca_out
2067 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2068 extern void bfd_elf32_swap_phdr_in
2069 (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
2070 extern void bfd_elf32_swap_phdr_out
2071 (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
2072 extern void bfd_elf32_swap_dyn_in
2073 (bfd *, const void *, Elf_Internal_Dyn *);
2074 extern void bfd_elf32_swap_dyn_out
2075 (bfd *, const Elf_Internal_Dyn *, void *);
2076 extern long bfd_elf32_slurp_symbol_table
2077 (bfd *, asymbol **, bfd_boolean);
2078 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
2080 extern int bfd_elf32_write_out_phdrs
2081 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2082 extern bfd_boolean bfd_elf32_checksum_contents
2083 (bfd * , void (*) (const void *, size_t, void *), void *);
2084 extern void bfd_elf32_write_relocs
2085 (bfd *, asection *, void *);
2086 extern bfd_boolean bfd_elf32_slurp_reloc_table
2087 (bfd *, asection *, asymbol **, bfd_boolean);
2089 extern const bfd_target *bfd_elf64_object_p
2091 extern const bfd_target *bfd_elf64_core_file_p
2093 extern char *bfd_elf64_core_file_failing_command
2095 extern int bfd_elf64_core_file_failing_signal
2097 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
2099 extern int bfd_elf64_core_file_pid
2102 extern bfd_boolean bfd_elf64_swap_symbol_in
2103 (bfd *, const void *, const void *, Elf_Internal_Sym *);
2104 extern void bfd_elf64_swap_symbol_out
2105 (bfd *, const Elf_Internal_Sym *, void *, void *);
2106 extern void bfd_elf64_swap_reloc_in
2107 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2108 extern void bfd_elf64_swap_reloc_out
2109 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2110 extern void bfd_elf64_swap_reloca_in
2111 (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2112 extern void bfd_elf64_swap_reloca_out
2113 (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2114 extern void bfd_elf64_swap_phdr_in
2115 (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
2116 extern void bfd_elf64_swap_phdr_out
2117 (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
2118 extern void bfd_elf64_swap_dyn_in
2119 (bfd *, const void *, Elf_Internal_Dyn *);
2120 extern void bfd_elf64_swap_dyn_out
2121 (bfd *, const Elf_Internal_Dyn *, void *);
2122 extern long bfd_elf64_slurp_symbol_table
2123 (bfd *, asymbol **, bfd_boolean);
2124 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
2126 extern int bfd_elf64_write_out_phdrs
2127 (bfd *, const Elf_Internal_Phdr *, unsigned int);
2128 extern bfd_boolean bfd_elf64_checksum_contents
2129 (bfd * , void (*) (const void *, size_t, void *), void *);
2130 extern void bfd_elf64_write_relocs
2131 (bfd *, asection *, void *);
2132 extern bfd_boolean bfd_elf64_slurp_reloc_table
2133 (bfd *, asection *, asymbol **, bfd_boolean);
2135 extern bfd_boolean _bfd_elf_default_relocs_compatible
2136 (const bfd_target *, const bfd_target *);
2138 extern bfd_boolean _bfd_elf_relocs_compatible
2139 (const bfd_target *, const bfd_target *);
2141 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
2142 (bfd *, struct bfd_link_info *, const char *);
2143 extern bfd_boolean bfd_elf_link_add_symbols
2144 (bfd *, struct bfd_link_info *);
2145 extern bfd_boolean _bfd_elf_add_dynamic_entry
2146 (struct bfd_link_info *, bfd_vma, bfd_vma);
2148 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
2149 (struct bfd_link_info *, struct elf_link_hash_entry *);
2151 extern int bfd_elf_link_record_local_dynamic_symbol
2152 (struct bfd_link_info *, bfd *, long);
2154 extern bfd_boolean _bfd_elf_close_and_cleanup
2157 extern bfd_boolean _bfd_elf_common_definition
2158 (Elf_Internal_Sym *);
2160 extern unsigned int _bfd_elf_common_section_index
2163 extern asection *_bfd_elf_common_section
2166 extern bfd_vma _bfd_elf_default_got_elt_size
2167 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
2170 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
2171 (bfd *, arelent *, struct bfd_symbol *, void *,
2172 asection *, bfd *, char **);
2174 extern bfd_boolean bfd_elf_final_link
2175 (bfd *, struct bfd_link_info *);
2177 extern void _bfd_elf_gc_keep
2178 (struct bfd_link_info *info);
2180 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
2181 (struct elf_link_hash_entry *h, void *inf);
2183 extern bfd_boolean bfd_elf_gc_sections
2184 (bfd *, struct bfd_link_info *);
2186 extern bfd_boolean bfd_elf_gc_record_vtinherit
2187 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2189 extern bfd_boolean bfd_elf_gc_record_vtentry
2190 (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
2192 extern asection *_bfd_elf_gc_mark_hook
2193 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
2194 struct elf_link_hash_entry *, Elf_Internal_Sym *);
2196 extern asection *_bfd_elf_gc_mark_rsec
2197 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2198 struct elf_reloc_cookie *);
2200 extern bfd_boolean _bfd_elf_gc_mark_reloc
2201 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
2202 struct elf_reloc_cookie *);
2204 extern bfd_boolean _bfd_elf_gc_mark_fdes
2205 (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
2206 struct elf_reloc_cookie *);
2208 extern bfd_boolean _bfd_elf_gc_mark
2209 (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);
2211 extern bfd_boolean _bfd_elf_gc_mark_extra_sections
2212 (struct bfd_link_info *, elf_gc_mark_hook_fn);
2214 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
2215 (bfd *, struct bfd_link_info *);
2217 extern bfd_boolean bfd_elf_gc_common_final_link
2218 (bfd *, struct bfd_link_info *);
2220 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
2223 extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
2224 (bfd *, asection *);
2226 extern bfd_boolean _bfd_elf_map_sections_to_segments
2227 (bfd *, struct bfd_link_info *);
2229 extern bfd_boolean _bfd_elf_is_function_type (unsigned int);
2231 extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
2234 extern int bfd_elf_get_default_section_type (flagword);
2236 extern bfd_boolean bfd_elf_lookup_section_flags
2237 (struct bfd_link_info *, struct flag_info *, asection *);
2239 extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
2240 (bfd * abfd, asection * section);
2242 /* Exported interface for writing elf corefile notes. */
2243 extern char *elfcore_write_note
2244 (bfd *, char *, int *, const char *, int, const void *, int);
2245 extern char *elfcore_write_prpsinfo
2246 (bfd *, char *, int *, const char *, const char *);
2247 extern char *elfcore_write_prstatus
2248 (bfd *, char *, int *, long, int, const void *);
2249 extern char * elfcore_write_pstatus
2250 (bfd *, char *, int *, long, int, const void *);
2251 extern char *elfcore_write_prfpreg
2252 (bfd *, char *, int *, const void *, int);
2253 extern char *elfcore_write_prxfpreg
2254 (bfd *, char *, int *, const void *, int);
2255 extern char *elfcore_write_xstatereg
2256 (bfd *, char *, int *, const void *, int);
2257 extern char *elfcore_write_ppc_vmx
2258 (bfd *, char *, int *, const void *, int);
2259 extern char *elfcore_write_ppc_vsx
2260 (bfd *, char *, int *, const void *, int);
2261 extern char *elfcore_write_s390_timer
2262 (bfd *, char *, int *, const void *, int);
2263 extern char *elfcore_write_s390_todcmp
2264 (bfd *, char *, int *, const void *, int);
2265 extern char *elfcore_write_s390_todpreg
2266 (bfd *, char *, int *, const void *, int);
2267 extern char *elfcore_write_s390_ctrs
2268 (bfd *, char *, int *, const void *, int);
2269 extern char *elfcore_write_s390_prefix
2270 (bfd *, char *, int *, const void *, int);
2271 extern char *elfcore_write_s390_last_break
2272 (bfd *, char *, int *, const void *, int);
2273 extern char *elfcore_write_s390_system_call
2274 (bfd *, char *, int *, const void *, int);
2275 extern char *elfcore_write_arm_vfp
2276 (bfd *, char *, int *, const void *, int);
2277 extern char *elfcore_write_aarch_tls
2278 (bfd *, char *, int *, const void *, int);
2279 extern char *elfcore_write_aarch_hw_break
2280 (bfd *, char *, int *, const void *, int);
2281 extern char *elfcore_write_aarch_hw_watch
2282 (bfd *, char *, int *, const void *, int);
2283 extern char *elfcore_write_lwpstatus
2284 (bfd *, char *, int *, long, int, const void *);
2285 extern char *elfcore_write_register_note
2286 (bfd *, char *, int *, const char *, const void *, int);
2288 /* Internal structure which holds information to be included in the
2289 PRPSINFO section of Linux core files.
2291 This is an "internal" structure in the sense that it should be used
2292 to pass information to BFD (via the `elfcore_write_linux_prpsinfo'
2293 function), so things like endianess shouldn't be an issue. This
2294 structure will eventually be converted in one of the
2295 `elf_external_linux_*' structures and written out to an output bfd
2296 by one of the functions declared below. */
2298 struct elf_internal_linux_prpsinfo
2300 char pr_state; /* Numeric process state. */
2301 char pr_sname; /* Char for pr_state. */
2302 char pr_zomb; /* Zombie. */
2303 char pr_nice; /* Nice val. */
2304 unsigned long pr_flag; /* Flags. */
2305 unsigned int pr_uid;
2306 unsigned int pr_gid;
2307 int pr_pid, pr_ppid, pr_pgrp, pr_sid;
2308 char pr_fname[16 + 1]; /* Filename of executable. */
2309 char pr_psargs[80 + 1]; /* Initial part of arg list. */
2312 /* Linux/most 32-bit archs. */
2313 extern char *elfcore_write_linux_prpsinfo32
2314 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2316 /* Linux/most 64-bit archs. */
2317 extern char *elfcore_write_linux_prpsinfo64
2318 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2320 /* Linux/PPC32 uses different layout compared to most archs. */
2321 extern char *elfcore_write_ppc_linux_prpsinfo32
2322 (bfd *, char *, int *, const struct elf_internal_linux_prpsinfo *);
2324 extern bfd *_bfd_elf32_bfd_from_remote_memory
2325 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2326 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2327 extern bfd *_bfd_elf64_bfd_from_remote_memory
2328 (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
2329 int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
2331 extern bfd_vma bfd_elf_obj_attr_size (bfd *);
2332 extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
2333 extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
2334 extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
2335 #define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
2336 bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2337 extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
2338 #define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
2339 bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
2340 extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
2342 #define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
2343 bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
2346 extern char *_bfd_elf_attr_strdup (bfd *, const char *);
2347 extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
2348 extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
2349 extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
2350 extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
2351 extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
2352 extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
2353 extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);
2355 /* The linker may need to keep track of the number of relocs that it
2356 decides to copy as dynamic relocs in check_relocs for each symbol.
2357 This is so that it can later discard them if they are found to be
2358 unnecessary. We can store the information in a field extending the
2359 regular ELF linker hash table. */
2361 struct elf_dyn_relocs
2363 struct elf_dyn_relocs *next;
2365 /* The input section of the reloc. */
2368 /* Total number of relocs copied for the input section. */
2369 bfd_size_type count;
2371 /* Number of pc-relative relocs copied for the input section. */
2372 bfd_size_type pc_count;
2375 extern bfd_boolean _bfd_elf_create_ifunc_sections
2376 (bfd *, struct bfd_link_info *);
2377 extern asection * _bfd_elf_create_ifunc_dyn_reloc
2378 (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc,
2379 struct elf_dyn_relocs **);
2380 extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
2381 (struct bfd_link_info *, struct elf_link_hash_entry *,
2382 struct elf_dyn_relocs **, unsigned int, unsigned int);
2384 extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
2385 extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
2387 extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
2388 extern bfd_vma elf64_r_sym (bfd_vma);
2389 extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
2390 extern bfd_vma elf32_r_sym (bfd_vma);
2392 /* Large common section. */
2393 extern asection _bfd_elf_large_com_section;
2395 /* Hash for local symbol with the first section id, ID, in the input
2396 file and the local symbol index, SYM. */
2397 #define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
2398 (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
2399 ^ (SYM) ^ ((ID) >> 16))
2401 /* This is the condition under which finish_dynamic_symbol will be called.
2402 If our finish_dynamic_symbol isn't called, we'll need to do something
2403 about initializing any .plt and .got entries in relocate_section. */
2404 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2406 && ((SHARED) || !(H)->forced_local) \
2407 && ((H)->dynindx != -1 || (H)->forced_local))
2409 /* This macro is to avoid lots of duplicated code in the body
2410 of xxx_relocate_section() in the various elfxx-xxxx.c files. */
2411 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel, \
2412 r_symndx, symtab_hdr, sym_hashes, \
2413 h, sec, relocation, \
2414 unresolved_reloc, warned) \
2417 /* It seems this can happen with erroneous or unsupported \
2418 input (mixing a.out and elf in an archive, for example.) */ \
2419 if (sym_hashes == NULL) \
2422 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; \
2424 while (h->root.type == bfd_link_hash_indirect \
2425 || h->root.type == bfd_link_hash_warning) \
2426 h = (struct elf_link_hash_entry *) h->root.u.i.link; \
2429 unresolved_reloc = FALSE; \
2431 if (h->root.type == bfd_link_hash_defined \
2432 || h->root.type == bfd_link_hash_defweak) \
2434 sec = h->root.u.def.section; \
2436 || sec->output_section == NULL) \
2437 /* Set a flag that will be cleared later if we find a \
2438 relocation value for this symbol. output_section \
2439 is typically NULL for symbols satisfied by a shared \
2441 unresolved_reloc = TRUE; \
2443 relocation = (h->root.u.def.value \
2444 + sec->output_section->vma \
2445 + sec->output_offset); \
2447 else if (h->root.type == bfd_link_hash_undefweak) \
2449 else if (info->unresolved_syms_in_objects == RM_IGNORE \
2450 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) \
2452 else if (!info->relocatable) \
2455 err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR \
2456 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT); \
2457 if (!info->callbacks->undefined_symbol (info, \
2458 h->root.root.string, \
2461 rel->r_offset, err)) \
2465 (void) unresolved_reloc; \
2470 /* This macro is to avoid lots of duplicated code in the body of the
2471 loop over relocations in xxx_relocate_section() in the various
2474 Handle relocations against symbols from removed linkonce sections,
2475 or sections discarded by a linker script. When doing a relocatable
2476 link, we remove such relocations. Otherwise, we just want the
2477 section contents zeroed and avoid any special processing. */
2478 #define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
2479 rel, count, relend, \
2480 howto, index, contents) \
2483 _bfd_clear_contents (howto, input_bfd, input_section, \
2484 contents + rel[index].r_offset); \
2486 if (info->relocatable \
2487 && (input_section->flags & SEC_DEBUGGING)) \
2489 /* Only remove relocations in debug sections since other \
2490 sections may require relocations. */ \
2491 Elf_Internal_Shdr *rel_hdr; \
2493 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
2495 /* Avoid empty output section. */ \
2496 if (rel_hdr->sh_size > count * rel_hdr->sh_entsize) \
2498 rel_hdr->sh_size -= count * rel_hdr->sh_entsize; \
2499 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
2500 rel_hdr->sh_size -= count * rel_hdr->sh_entsize; \
2502 memmove (rel, rel + count, \
2503 (relend - rel - count) * sizeof (*rel)); \
2505 input_section->reloc_count -= count; \
2512 for (i_ = 0; i_ < count; i_++) \
2514 rel[i_].r_info = 0; \
2515 rel[i_].r_addend = 0; \
2521 /* Will a symbol be bound to the definition within the shared
2522 library, if any. A unique symbol can never be bound locally. */
2523 #define SYMBOLIC_BIND(INFO, H) \
2524 (!(H)->unique_global \
2525 && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))
2527 #endif /* _LIBELF_H_ */