2 Copyright 1995, 1996, 1997 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 static boolean elf_link_add_object_symbols
23 PARAMS ((bfd
*, struct bfd_link_info
*));
24 static boolean elf_link_add_archive_symbols
25 PARAMS ((bfd
*, struct bfd_link_info
*));
26 static boolean elf_export_symbol
27 PARAMS ((struct elf_link_hash_entry
*, PTR
));
28 static boolean elf_adjust_dynamic_symbol
29 PARAMS ((struct elf_link_hash_entry
*, PTR
));
30 static boolean elf_link_find_version_dependencies
31 PARAMS ((struct elf_link_hash_entry
*, PTR
));
32 static boolean elf_link_find_version_dependencies
33 PARAMS ((struct elf_link_hash_entry
*, PTR
));
34 static boolean elf_link_assign_sym_version
35 PARAMS ((struct elf_link_hash_entry
*, PTR
));
36 static boolean elf_link_renumber_dynsyms
37 PARAMS ((struct elf_link_hash_entry
*, PTR
));
39 /* This struct is used to pass information to routines called via
40 elf_link_hash_traverse which must return failure. */
42 struct elf_info_failed
45 struct bfd_link_info
*info
;
48 /* Given an ELF BFD, add symbols to the global hash table as
52 elf_bfd_link_add_symbols (abfd
, info
)
54 struct bfd_link_info
*info
;
56 switch (bfd_get_format (abfd
))
59 return elf_link_add_object_symbols (abfd
, info
);
61 return elf_link_add_archive_symbols (abfd
, info
);
63 bfd_set_error (bfd_error_wrong_format
);
69 /* Add symbols from an ELF archive file to the linker hash table. We
70 don't use _bfd_generic_link_add_archive_symbols because of a
71 problem which arises on UnixWare. The UnixWare libc.so is an
72 archive which includes an entry libc.so.1 which defines a bunch of
73 symbols. The libc.so archive also includes a number of other
74 object files, which also define symbols, some of which are the same
75 as those defined in libc.so.1. Correct linking requires that we
76 consider each object file in turn, and include it if it defines any
77 symbols we need. _bfd_generic_link_add_archive_symbols does not do
78 this; it looks through the list of undefined symbols, and includes
79 any object file which defines them. When this algorithm is used on
80 UnixWare, it winds up pulling in libc.so.1 early and defining a
81 bunch of symbols. This means that some of the other objects in the
82 archive are not included in the link, which is incorrect since they
83 precede libc.so.1 in the archive.
85 Fortunately, ELF archive handling is simpler than that done by
86 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
87 oddities. In ELF, if we find a symbol in the archive map, and the
88 symbol is currently undefined, we know that we must pull in that
91 Unfortunately, we do have to make multiple passes over the symbol
92 table until nothing further is resolved. */
95 elf_link_add_archive_symbols (abfd
, info
)
97 struct bfd_link_info
*info
;
100 boolean
*defined
= NULL
;
101 boolean
*included
= NULL
;
105 if (! bfd_has_map (abfd
))
107 /* An empty archive is a special case. */
108 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
110 bfd_set_error (bfd_error_no_armap
);
114 /* Keep track of all symbols we know to be already defined, and all
115 files we know to be already included. This is to speed up the
116 second and subsequent passes. */
117 c
= bfd_ardata (abfd
)->symdef_count
;
120 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
121 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
122 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
124 memset (defined
, 0, c
* sizeof (boolean
));
125 memset (included
, 0, c
* sizeof (boolean
));
127 symdefs
= bfd_ardata (abfd
)->symdefs
;
140 symdefend
= symdef
+ c
;
141 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
143 struct elf_link_hash_entry
*h
;
145 struct bfd_link_hash_entry
*undefs_tail
;
148 if (defined
[i
] || included
[i
])
150 if (symdef
->file_offset
== last
)
156 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
157 false, false, false);
163 /* If this is a default version (the name contains @@),
164 look up the symbol again without the version. The
165 effect is that references to the symbol without the
166 version will be matched by the default symbol in the
169 p
= strchr (symdef
->name
, ELF_VER_CHR
);
170 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
173 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
176 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
177 copy
[p
- symdef
->name
] = '\0';
179 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
180 false, false, false);
182 bfd_release (abfd
, copy
);
188 if (h
->root
.type
!= bfd_link_hash_undefined
)
190 if (h
->root
.type
!= bfd_link_hash_undefweak
)
195 /* We need to include this archive member. */
197 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
198 if (element
== (bfd
*) NULL
)
201 if (! bfd_check_format (element
, bfd_object
))
204 /* Doublecheck that we have not included this object
205 already--it should be impossible, but there may be
206 something wrong with the archive. */
207 if (element
->archive_pass
!= 0)
209 bfd_set_error (bfd_error_bad_value
);
212 element
->archive_pass
= 1;
214 undefs_tail
= info
->hash
->undefs_tail
;
216 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
219 if (! elf_link_add_object_symbols (element
, info
))
222 /* If there are any new undefined symbols, we need to make
223 another pass through the archive in order to see whether
224 they can be defined. FIXME: This isn't perfect, because
225 common symbols wind up on undefs_tail and because an
226 undefined symbol which is defined later on in this pass
227 does not require another pass. This isn't a bug, but it
228 does make the code less efficient than it could be. */
229 if (undefs_tail
!= info
->hash
->undefs_tail
)
232 /* Look backward to mark all symbols from this object file
233 which we have already seen in this pass. */
237 included
[mark
] = true;
242 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
244 /* We mark subsequent symbols from this object file as we go
245 on through the loop. */
246 last
= symdef
->file_offset
;
257 if (defined
!= (boolean
*) NULL
)
259 if (included
!= (boolean
*) NULL
)
264 /* Add symbols from an ELF object file to the linker hash table. */
267 elf_link_add_object_symbols (abfd
, info
)
269 struct bfd_link_info
*info
;
271 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
272 const Elf_Internal_Sym
*,
273 const char **, flagword
*,
274 asection
**, bfd_vma
*));
275 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
276 asection
*, const Elf_Internal_Rela
*));
278 Elf_Internal_Shdr
*hdr
;
282 Elf_External_Sym
*buf
= NULL
;
283 struct elf_link_hash_entry
**sym_hash
;
285 bfd_byte
*dynver
= NULL
;
286 Elf_External_Versym
*extversym
= NULL
;
287 Elf_External_Versym
*ever
;
288 Elf_External_Dyn
*dynbuf
= NULL
;
289 struct elf_link_hash_entry
*weaks
;
290 Elf_External_Sym
*esym
;
291 Elf_External_Sym
*esymend
;
293 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
294 collect
= get_elf_backend_data (abfd
)->collect
;
296 if ((abfd
->flags
& DYNAMIC
) == 0)
302 /* You can't use -r against a dynamic object. Also, there's no
303 hope of using a dynamic object which does not exactly match
304 the format of the output file. */
305 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
307 bfd_set_error (bfd_error_invalid_operation
);
312 /* As a GNU extension, any input sections which are named
313 .gnu.warning.SYMBOL are treated as warning symbols for the given
314 symbol. This differs from .gnu.warning sections, which generate
315 warnings when they are included in an output file. */
320 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
324 name
= bfd_get_section_name (abfd
, s
);
325 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
330 name
+= sizeof ".gnu.warning." - 1;
332 /* If this is a shared object, then look up the symbol
333 in the hash table. If it is there, and it is already
334 been defined, then we will not be using the entry
335 from this shared object, so we don't need to warn.
336 FIXME: If we see the definition in a regular object
337 later on, we will warn, but we shouldn't. The only
338 fix is to keep track of what warnings we are supposed
339 to emit, and then handle them all at the end of the
341 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
343 struct elf_link_hash_entry
*h
;
345 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
348 /* FIXME: What about bfd_link_hash_common? */
350 && (h
->root
.type
== bfd_link_hash_defined
351 || h
->root
.type
== bfd_link_hash_defweak
))
353 /* We don't want to issue this warning. Clobber
354 the section size so that the warning does not
355 get copied into the output file. */
361 sz
= bfd_section_size (abfd
, s
);
362 msg
= (char *) bfd_alloc (abfd
, sz
);
366 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
369 if (! (_bfd_generic_link_add_one_symbol
370 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
371 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
374 if (! info
->relocateable
)
376 /* Clobber the section size so that the warning does
377 not get copied into the output file. */
384 /* If this is a dynamic object, we always link against the .dynsym
385 symbol table, not the .symtab symbol table. The dynamic linker
386 will only see the .dynsym symbol table, so there is no reason to
387 look at .symtab for a dynamic object. */
389 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
390 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
392 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
396 /* Read in any version definitions. */
398 if (elf_dynverdef (abfd
) != 0)
400 Elf_Internal_Shdr
*verdefhdr
;
403 const Elf_External_Verdef
*extverdef
;
404 Elf_Internal_Verdef
*intverdef
;
406 verdefhdr
= &elf_tdata (abfd
)->dynverdef_hdr
;
407 elf_tdata (abfd
)->verdef
=
408 ((Elf_Internal_Verdef
*)
410 verdefhdr
->sh_info
* sizeof (Elf_Internal_Verdef
)));
411 if (elf_tdata (abfd
)->verdef
== NULL
)
414 dynver
= (bfd_byte
*) bfd_malloc (verdefhdr
->sh_size
);
418 if (bfd_seek (abfd
, verdefhdr
->sh_offset
, SEEK_SET
) != 0
419 || (bfd_read ((PTR
) dynver
, 1, verdefhdr
->sh_size
, abfd
)
420 != verdefhdr
->sh_size
))
423 extverdef
= (const Elf_External_Verdef
*) dynver
;
424 intverdef
= elf_tdata (abfd
)->verdef
;
425 for (i
= 0; i
< verdefhdr
->sh_info
; i
++, intverdef
++)
427 const Elf_External_Verdaux
*extverdaux
;
428 Elf_Internal_Verdaux intverdaux
;
430 _bfd_elf_swap_verdef_in (abfd
, extverdef
, intverdef
);
432 /* Pick up the name of the version. */
433 extverdaux
= ((const Elf_External_Verdaux
*)
434 ((bfd_byte
*) extverdef
+ intverdef
->vd_aux
));
435 _bfd_elf_swap_verdaux_in (abfd
, extverdaux
, &intverdaux
);
437 intverdef
->vd_bfd
= abfd
;
438 intverdef
->vd_nodename
=
439 bfd_elf_string_from_elf_section (abfd
, verdefhdr
->sh_link
,
440 intverdaux
.vda_name
);
442 extverdef
= ((const Elf_External_Verdef
*)
443 ((bfd_byte
*) extverdef
+ intverdef
->vd_next
));
450 /* Read in the symbol versions, but don't bother to convert them
451 to internal format. */
452 if (elf_dynversym (abfd
) != 0)
454 Elf_Internal_Shdr
*versymhdr
;
456 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
457 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
458 if (extversym
== NULL
)
460 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
461 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
462 != versymhdr
->sh_size
))
467 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
469 /* The sh_info field of the symtab header tells us where the
470 external symbols start. We don't care about the local symbols at
472 if (elf_bad_symtab (abfd
))
474 extsymcount
= symcount
;
479 extsymcount
= symcount
- hdr
->sh_info
;
480 extsymoff
= hdr
->sh_info
;
483 buf
= ((Elf_External_Sym
*)
484 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
485 if (buf
== NULL
&& extsymcount
!= 0)
488 /* We store a pointer to the hash table entry for each external
490 sym_hash
= ((struct elf_link_hash_entry
**)
492 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
493 if (sym_hash
== NULL
)
495 elf_sym_hashes (abfd
) = sym_hash
;
499 /* If we are creating a shared library, create all the dynamic
500 sections immediately. We need to attach them to something,
501 so we attach them to this BFD, provided it is the right
502 format. FIXME: If there are no input BFD's of the same
503 format as the output, we can't make a shared library. */
505 && ! elf_hash_table (info
)->dynamic_sections_created
506 && abfd
->xvec
== info
->hash
->creator
)
508 if (! elf_link_create_dynamic_sections (abfd
, info
))
517 bfd_size_type oldsize
;
518 bfd_size_type strindex
;
520 /* Find the name to use in a DT_NEEDED entry that refers to this
521 object. If the object has a DT_SONAME entry, we use it.
522 Otherwise, if the generic linker stuck something in
523 elf_dt_name, we use that. Otherwise, we just use the file
524 name. If the generic linker put a null string into
525 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
526 there is a DT_SONAME entry. */
528 name
= bfd_get_filename (abfd
);
529 if (elf_dt_name (abfd
) != NULL
)
531 name
= elf_dt_name (abfd
);
535 s
= bfd_get_section_by_name (abfd
, ".dynamic");
538 Elf_External_Dyn
*extdyn
;
539 Elf_External_Dyn
*extdynend
;
543 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
547 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
548 (file_ptr
) 0, s
->_raw_size
))
551 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
554 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
557 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
558 for (; extdyn
< extdynend
; extdyn
++)
560 Elf_Internal_Dyn dyn
;
562 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
563 if (dyn
.d_tag
== DT_SONAME
)
565 name
= bfd_elf_string_from_elf_section (abfd
, link
,
570 if (dyn
.d_tag
== DT_NEEDED
)
572 struct bfd_link_needed_list
*n
, **pn
;
575 n
= ((struct bfd_link_needed_list
*)
576 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
577 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
579 if (n
== NULL
|| fnm
== NULL
)
581 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
588 for (pn
= &elf_hash_table (info
)->needed
;
600 /* We do not want to include any of the sections in a dynamic
601 object in the output file. We hack by simply clobbering the
602 list of sections in the BFD. This could be handled more
603 cleanly by, say, a new section flag; the existing
604 SEC_NEVER_LOAD flag is not the one we want, because that one
605 still implies that the section takes up space in the output
607 abfd
->sections
= NULL
;
608 abfd
->section_count
= 0;
610 /* If this is the first dynamic object found in the link, create
611 the special sections required for dynamic linking. */
612 if (! elf_hash_table (info
)->dynamic_sections_created
)
614 if (! elf_link_create_dynamic_sections (abfd
, info
))
620 /* Add a DT_NEEDED entry for this dynamic object. */
621 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
622 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
624 if (strindex
== (bfd_size_type
) -1)
627 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
630 Elf_External_Dyn
*dyncon
, *dynconend
;
632 /* The hash table size did not change, which means that
633 the dynamic object name was already entered. If we
634 have already included this dynamic object in the
635 link, just ignore it. There is no reason to include
636 a particular dynamic object more than once. */
637 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
639 BFD_ASSERT (sdyn
!= NULL
);
641 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
642 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
644 for (; dyncon
< dynconend
; dyncon
++)
646 Elf_Internal_Dyn dyn
;
648 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
650 if (dyn
.d_tag
== DT_NEEDED
651 && dyn
.d_un
.d_val
== strindex
)
655 if (extversym
!= NULL
)
662 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
666 /* Save the SONAME, if there is one, because sometimes the
667 linker emulation code will need to know it. */
669 name
= bfd_get_filename (abfd
);
670 elf_dt_name (abfd
) = name
;
674 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
676 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
677 != extsymcount
* sizeof (Elf_External_Sym
)))
682 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
683 esymend
= buf
+ extsymcount
;
686 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
688 Elf_Internal_Sym sym
;
694 struct elf_link_hash_entry
*h
;
696 boolean size_change_ok
, type_change_ok
;
699 elf_swap_symbol_in (abfd
, esym
, &sym
);
701 flags
= BSF_NO_FLAGS
;
703 value
= sym
.st_value
;
706 bind
= ELF_ST_BIND (sym
.st_info
);
707 if (bind
== STB_LOCAL
)
709 /* This should be impossible, since ELF requires that all
710 global symbols follow all local symbols, and that sh_info
711 point to the first global symbol. Unfortunatealy, Irix 5
715 else if (bind
== STB_GLOBAL
)
717 if (sym
.st_shndx
!= SHN_UNDEF
718 && sym
.st_shndx
!= SHN_COMMON
)
723 else if (bind
== STB_WEAK
)
727 /* Leave it up to the processor backend. */
730 if (sym
.st_shndx
== SHN_UNDEF
)
731 sec
= bfd_und_section_ptr
;
732 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
734 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
736 sec
= bfd_abs_section_ptr
;
737 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
740 else if (sym
.st_shndx
== SHN_ABS
)
741 sec
= bfd_abs_section_ptr
;
742 else if (sym
.st_shndx
== SHN_COMMON
)
744 sec
= bfd_com_section_ptr
;
745 /* What ELF calls the size we call the value. What ELF
746 calls the value we call the alignment. */
751 /* Leave it up to the processor backend. */
754 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
755 if (name
== (const char *) NULL
)
760 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
764 /* The hook function sets the name to NULL if this symbol
765 should be skipped for some reason. */
766 if (name
== (const char *) NULL
)
770 /* Sanity check that all possibilities were handled. */
771 if (sec
== (asection
*) NULL
)
773 bfd_set_error (bfd_error_bad_value
);
777 if (bfd_is_und_section (sec
)
778 || bfd_is_com_section (sec
))
783 size_change_ok
= false;
784 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
785 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
787 Elf_Internal_Versym iver
;
793 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
794 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
796 /* If this is a hidden symbol, or if it is not version
797 1, we append the version name to the symbol name.
798 However, we do not modify a non-hidden absolute
799 symbol, because it might be the version symbol
800 itself. FIXME: What if it isn't? */
801 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
802 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
808 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
810 (*_bfd_error_handler
)
811 ("%s: %s: invalid version %d (max %d)",
812 abfd
->filename
, name
, vernum
,
813 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
814 bfd_set_error (bfd_error_bad_value
);
818 verstr
= elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
822 namelen
= strlen (name
);
823 newlen
= namelen
+ strlen (verstr
) + 2;
824 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
827 newname
= (char *) bfd_alloc (abfd
, newlen
);
830 strcpy (newname
, name
);
831 p
= newname
+ namelen
;
833 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
841 /* We need to look up the symbol now in order to get some of
842 the dynamic object handling right. We pass the hash
843 table entry in to _bfd_generic_link_add_one_symbol so
844 that it does not have to look it up again. */
845 if (! bfd_is_und_section (sec
))
846 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
849 h
= ((struct elf_link_hash_entry
*)
850 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true,
856 if (h
->root
.type
== bfd_link_hash_new
)
857 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
859 while (h
->root
.type
== bfd_link_hash_indirect
860 || h
->root
.type
== bfd_link_hash_warning
)
861 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
863 /* It's OK to change the type if it used to be a weak
864 definition, or if the current definition is weak (and
865 hence might be ignored). */
866 if (h
->root
.type
== bfd_link_hash_defweak
867 || h
->root
.type
== bfd_link_hash_undefweak
869 type_change_ok
= true;
871 /* It's OK to change the size if it used to be a weak
872 definition, or if it used to be undefined, or if we will
873 be overriding an old definition. */
875 || h
->root
.type
== bfd_link_hash_undefined
)
876 size_change_ok
= true;
880 /* If we are looking at a dynamic object, and this is a
881 definition, we need to see if it has already been defined
882 by some other object. If it has, we want to use the
883 existing definition, and we do not want to report a
884 multiple symbol definition error; we do this by
885 clobbering sec to be bfd_und_section_ptr. We treat a
886 common symbol as a definition if the symbol in the shared
887 library is a function, since common symbols always
888 represent variables; this can cause confusion in
889 principle, but any such confusion would seem to indicate
890 an erroneous program or shared library. */
891 if (dynamic
&& definition
)
893 if (h
->root
.type
== bfd_link_hash_defined
894 || h
->root
.type
== bfd_link_hash_defweak
895 || (h
->root
.type
== bfd_link_hash_common
897 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
)))
900 sec
= bfd_und_section_ptr
;
902 size_change_ok
= true;
903 if (h
->root
.type
== bfd_link_hash_common
)
904 type_change_ok
= true;
908 /* If we already have a common symbol, and the symbol in the
909 shared library is in an uninitialized section, then treat
910 the shared library symbol as a common symbol. This will
911 not always be correct, but it should do little harm. */
914 && h
->root
.type
== bfd_link_hash_common
915 && (sec
->flags
& SEC_ALLOC
) != 0
916 && (sec
->flags
& SEC_LOAD
) == 0)
918 if (! ((*info
->callbacks
->multiple_common
)
919 (info
, h
->root
.root
.string
,
920 h
->root
.u
.c
.p
->section
->owner
, bfd_link_hash_common
,
921 h
->root
.u
.c
.size
, abfd
, bfd_link_hash_common
,
925 /* If the symbol in the shared library is smaller than
926 the one we already have, then override it to stick
927 with the larger symbol. Set SIZE_CHANGE_OK because
928 we only want to warn if requested with --warn-common. */
929 if (sym
.st_size
< h
->size
)
932 sec
= bfd_und_section_ptr
;
934 size_change_ok
= true;
938 /* Similarly, if we are not looking at a dynamic object, and
939 we have a definition, we want to override any definition
940 we may have from a dynamic object. Symbols from regular
941 files always take precedence over symbols from dynamic
942 objects, even if they are defined after the dynamic
943 object in the link. */
946 || (bfd_is_com_section (sec
)
947 && (h
->root
.type
== bfd_link_hash_defweak
948 || h
->type
== STT_FUNC
)))
949 && (h
->root
.type
== bfd_link_hash_defined
950 || h
->root
.type
== bfd_link_hash_defweak
)
951 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
952 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) != 0)
955 /* Change the hash table entry to undefined, and let
956 _bfd_generic_link_add_one_symbol do the right thing
957 with the new definition. */
958 h
->root
.type
= bfd_link_hash_undefined
;
959 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
960 size_change_ok
= true;
961 if (bfd_is_com_section (sec
))
962 type_change_ok
= true;
964 /* This union may have been set to be non-NULL when this
965 symbol was seen in a dynamic object. We must force
966 the union to be NULL, so that it is correct for a
968 h
->verinfo
.vertree
= NULL
;
974 && (h
->verinfo
.verdef
== NULL
|| definition
))
975 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
978 if (! (_bfd_generic_link_add_one_symbol
979 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
980 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
984 while (h
->root
.type
== bfd_link_hash_indirect
985 || h
->root
.type
== bfd_link_hash_warning
)
986 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
992 && (flags
& BSF_WEAK
) != 0
993 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
994 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
995 && h
->weakdef
== NULL
)
997 /* Keep a list of all weak defined non function symbols from
998 a dynamic object, using the weakdef field. Later in this
999 function we will set the weakdef field to the correct
1000 value. We only put non-function symbols from dynamic
1001 objects on this list, because that happens to be the only
1002 time we need to know the normal symbol corresponding to a
1003 weak symbol, and the information is time consuming to
1004 figure out. If the weakdef field is not already NULL,
1005 then this symbol was already defined by some previous
1006 dynamic object, and we will be using that previous
1007 definition anyhow. */
1014 /* Get the alignment of a common symbol. */
1015 if (sym
.st_shndx
== SHN_COMMON
1016 && h
->root
.type
== bfd_link_hash_common
)
1017 h
->root
.u
.c
.p
->alignment_power
= bfd_log2 (sym
.st_value
);
1019 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1025 /* Remember the symbol size and type. */
1026 if (sym
.st_size
!= 0
1027 && (definition
|| h
->size
== 0))
1029 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1030 (*_bfd_error_handler
)
1031 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
1032 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1033 bfd_get_filename (abfd
));
1035 h
->size
= sym
.st_size
;
1038 /* If this is a common symbol, then we always want H->SIZE
1039 to be the size of the common symbol. The code just above
1040 won't fix the size if a common symbol becomes larger. We
1041 don't warn about a size change here, because that is
1042 covered by --warn-common. */
1043 if (h
->root
.type
== bfd_link_hash_common
)
1044 h
->size
= h
->root
.u
.c
.size
;
1046 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1047 && (definition
|| h
->type
== STT_NOTYPE
))
1049 if (h
->type
!= STT_NOTYPE
1050 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1051 && ! type_change_ok
)
1052 (*_bfd_error_handler
)
1053 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1054 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1055 bfd_get_filename (abfd
));
1057 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1060 if (sym
.st_other
!= 0
1061 && (definition
|| h
->other
== 0))
1062 h
->other
= sym
.st_other
;
1064 /* Set a flag in the hash table entry indicating the type of
1065 reference or definition we just found. Keep a count of
1066 the number of dynamic symbols we find. A dynamic symbol
1067 is one which is referenced or defined by both a regular
1068 object and a shared object. */
1069 old_flags
= h
->elf_link_hash_flags
;
1074 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1076 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1078 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1079 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1085 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1087 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1088 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1089 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1090 || (h
->weakdef
!= NULL
1092 && h
->weakdef
->dynindx
!= -1))
1096 h
->elf_link_hash_flags
|= new_flag
;
1098 /* If this symbol has a version, and it is the default
1099 version, we create an indirect symbol from the default
1100 name to the fully decorated name. This will cause
1101 external references which do not specify a version to be
1102 bound to this version of the symbol. */
1107 p
= strchr (name
, ELF_VER_CHR
);
1108 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1111 struct elf_link_hash_entry
*hold
;
1113 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1115 if (shortname
== NULL
)
1117 strncpy (shortname
, name
, p
- name
);
1118 shortname
[p
- name
] = '\0';
1120 /* First look to see if we have an existing symbol
1122 hold
= elf_link_hash_lookup (elf_hash_table (info
),
1123 shortname
, false, false,
1126 /* If we are looking at a normal object, and the
1127 symbol was seen in a shared object, clobber the
1128 definition in the shared object. */
1131 && (hold
->root
.type
== bfd_link_hash_defined
1132 || hold
->root
.type
== bfd_link_hash_defweak
)
1133 && (hold
->elf_link_hash_flags
1134 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1135 && ((hold
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
)
1138 /* Change the hash table entry to undefined, so
1139 that _bfd_generic_link_add_one_symbol will do
1141 hold
->root
.type
= bfd_link_hash_undefined
;
1142 hold
->root
.u
.undef
.abfd
=
1143 hold
->root
.u
.def
.section
->owner
;
1144 hold
->verinfo
.vertree
= NULL
;
1148 /* If we are looking at a shared object, and we have
1149 already seen this symbol defined elsewhere, then
1150 don't try to define it again. */
1153 && (hold
->root
.type
== bfd_link_hash_defined
1154 || hold
->root
.type
== bfd_link_hash_defweak
1155 || hold
->root
.type
== bfd_link_hash_indirect
1156 || (hold
->root
.type
== bfd_link_hash_common
1157 && (bind
== STB_WEAK
1158 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
))))
1160 /* Don't add an indirect symbol. */
1164 struct elf_link_hash_entry
*hi
;
1167 if (! (_bfd_generic_link_add_one_symbol
1168 (info
, abfd
, shortname
, BSF_INDIRECT
,
1169 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1170 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1173 /* If there is a duplicate definition somewhere,
1174 then HI may not point to an indirect symbol.
1175 We will have reported an error to the user in
1178 if (hi
->root
.type
== bfd_link_hash_indirect
)
1180 hi
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
1182 /* If the symbol became indirect, then we
1183 assume that we have not seen a definition
1185 BFD_ASSERT ((hi
->elf_link_hash_flags
1186 & (ELF_LINK_HASH_DEF_DYNAMIC
1187 | ELF_LINK_HASH_DEF_REGULAR
))
1190 /* Copy down any references that we may have
1191 already seen to the symbol which just
1193 h
->elf_link_hash_flags
|=
1194 (hi
->elf_link_hash_flags
1195 & (ELF_LINK_HASH_REF_DYNAMIC
1196 | ELF_LINK_HASH_REF_REGULAR
));
1198 /* Copy over the global table offset entry.
1199 This may have been already set up by a
1200 check_relocs routine. */
1201 if (h
->got_offset
== (bfd_vma
) -1)
1203 h
->got_offset
= hi
->got_offset
;
1204 hi
->got_offset
= (bfd_vma
) -1;
1206 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1208 if (h
->dynindx
== -1)
1210 h
->dynindx
= hi
->dynindx
;
1211 h
->dynstr_index
= hi
->dynstr_index
;
1213 hi
->dynstr_index
= 0;
1215 BFD_ASSERT (hi
->dynindx
== -1);
1217 /* FIXME: There may be other information to
1218 copy over for particular targets. */
1220 /* See if the new flags lead us to realize
1221 that the symbol must be dynamic. */
1227 || ((hi
->elf_link_hash_flags
1228 & ELF_LINK_HASH_REF_DYNAMIC
)
1234 if ((hi
->elf_link_hash_flags
1235 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1242 /* We also need to define an indirection from the
1243 nondefault version of the symbol. */
1245 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1247 if (shortname
== NULL
)
1249 strncpy (shortname
, name
, p
- name
);
1250 strcpy (shortname
+ (p
- name
), p
+ 1);
1252 /* First look to see if we have an existing symbol
1254 hold
= elf_link_hash_lookup (elf_hash_table (info
),
1255 shortname
, false, false,
1258 /* If we are looking at a normal object, and the
1259 symbol was seen in a shared object, clobber the
1260 definition in the shared object. */
1263 && (hold
->root
.type
== bfd_link_hash_defined
1264 || hold
->root
.type
== bfd_link_hash_defweak
)
1265 && (hold
->elf_link_hash_flags
1266 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1267 && ((hold
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
)
1270 /* Change the hash table entry to undefined, so
1271 that _bfd_generic_link_add_one_symbol will do
1273 hold
->root
.type
= bfd_link_hash_undefined
;
1274 hold
->root
.u
.undef
.abfd
=
1275 hold
->root
.u
.def
.section
->owner
;
1276 hold
->verinfo
.vertree
= NULL
;
1280 /* If we are looking at a shared object, and we have
1281 already seen this symbol defined elsewhere, then
1282 don't try to define it again. */
1285 && (hold
->root
.type
== bfd_link_hash_defined
1286 || hold
->root
.type
== bfd_link_hash_defweak
1287 || hold
->root
.type
== bfd_link_hash_indirect
1288 || (hold
->root
.type
== bfd_link_hash_common
1289 && (bind
== STB_WEAK
1290 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
))))
1292 /* Don't add an indirect symbol. */
1296 struct elf_link_hash_entry
*hi
;
1299 if (! (_bfd_generic_link_add_one_symbol
1300 (info
, abfd
, shortname
, BSF_INDIRECT
,
1301 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1302 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1305 /* If there is a duplicate definition somewhere,
1306 then HI may not point to an indirect symbol.
1307 We will have reported an error to the user in
1310 if (hi
->root
.type
== bfd_link_hash_indirect
)
1312 hi
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
1314 /* If the symbol became indirect, then we
1315 assume that we have not seen a definition
1317 BFD_ASSERT ((hi
->elf_link_hash_flags
1318 & (ELF_LINK_HASH_DEF_DYNAMIC
1319 | ELF_LINK_HASH_DEF_REGULAR
))
1322 /* Copy down any references that we may have
1323 already seen to the symbol which just
1325 h
->elf_link_hash_flags
|=
1326 (hi
->elf_link_hash_flags
1327 & (ELF_LINK_HASH_REF_DYNAMIC
1328 | ELF_LINK_HASH_REF_REGULAR
));
1330 /* Copy over the global table offset entry.
1331 This may have been already set up by a
1332 check_relocs routine. */
1333 if (h
->got_offset
== (bfd_vma
) -1)
1335 h
->got_offset
= hi
->got_offset
;
1336 hi
->got_offset
= (bfd_vma
) -1;
1338 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1340 if (h
->dynindx
== -1)
1342 h
->dynindx
= hi
->dynindx
;
1343 h
->dynstr_index
= hi
->dynstr_index
;
1345 hi
->dynstr_index
= 0;
1347 BFD_ASSERT (hi
->dynindx
== -1);
1349 /* FIXME: There may be other information to
1350 copy over for particular targets. */
1352 /* See if the new flags lead us to realize
1353 that the symbol must be dynamic. */
1359 || ((hi
->elf_link_hash_flags
1360 & ELF_LINK_HASH_REF_DYNAMIC
)
1366 if ((hi
->elf_link_hash_flags
1367 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1376 if (dynsym
&& h
->dynindx
== -1)
1378 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1380 if (h
->weakdef
!= NULL
1382 && h
->weakdef
->dynindx
== -1)
1384 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1392 /* Now set the weakdefs field correctly for all the weak defined
1393 symbols we found. The only way to do this is to search all the
1394 symbols. Since we only need the information for non functions in
1395 dynamic objects, that's the only time we actually put anything on
1396 the list WEAKS. We need this information so that if a regular
1397 object refers to a symbol defined weakly in a dynamic object, the
1398 real symbol in the dynamic object is also put in the dynamic
1399 symbols; we also must arrange for both symbols to point to the
1400 same memory location. We could handle the general case of symbol
1401 aliasing, but a general symbol alias can only be generated in
1402 assembler code, handling it correctly would be very time
1403 consuming, and other ELF linkers don't handle general aliasing
1405 while (weaks
!= NULL
)
1407 struct elf_link_hash_entry
*hlook
;
1410 struct elf_link_hash_entry
**hpp
;
1411 struct elf_link_hash_entry
**hppend
;
1414 weaks
= hlook
->weakdef
;
1415 hlook
->weakdef
= NULL
;
1417 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1418 || hlook
->root
.type
== bfd_link_hash_defweak
1419 || hlook
->root
.type
== bfd_link_hash_common
1420 || hlook
->root
.type
== bfd_link_hash_indirect
);
1421 slook
= hlook
->root
.u
.def
.section
;
1422 vlook
= hlook
->root
.u
.def
.value
;
1424 hpp
= elf_sym_hashes (abfd
);
1425 hppend
= hpp
+ extsymcount
;
1426 for (; hpp
< hppend
; hpp
++)
1428 struct elf_link_hash_entry
*h
;
1431 if (h
!= NULL
&& h
!= hlook
1432 && h
->root
.type
== bfd_link_hash_defined
1433 && h
->root
.u
.def
.section
== slook
1434 && h
->root
.u
.def
.value
== vlook
)
1438 /* If the weak definition is in the list of dynamic
1439 symbols, make sure the real definition is put there
1441 if (hlook
->dynindx
!= -1
1442 && h
->dynindx
== -1)
1444 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1448 /* If the real definition is in the list of dynamic
1449 symbols, make sure the weak definition is put there
1450 as well. If we don't do this, then the dynamic
1451 loader might not merge the entries for the real
1452 definition and the weak definition. */
1453 if (h
->dynindx
!= -1
1454 && hlook
->dynindx
== -1)
1456 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1471 if (extversym
!= NULL
)
1477 /* If this object is the same format as the output object, and it is
1478 not a shared library, then let the backend look through the
1481 This is required to build global offset table entries and to
1482 arrange for dynamic relocs. It is not required for the
1483 particular common case of linking non PIC code, even when linking
1484 against shared libraries, but unfortunately there is no way of
1485 knowing whether an object file has been compiled PIC or not.
1486 Looking through the relocs is not particularly time consuming.
1487 The problem is that we must either (1) keep the relocs in memory,
1488 which causes the linker to require additional runtime memory or
1489 (2) read the relocs twice from the input file, which wastes time.
1490 This would be a good case for using mmap.
1492 I have no idea how to handle linking PIC code into a file of a
1493 different format. It probably can't be done. */
1494 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1496 && abfd
->xvec
== info
->hash
->creator
1497 && check_relocs
!= NULL
)
1501 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1503 Elf_Internal_Rela
*internal_relocs
;
1506 if ((o
->flags
& SEC_RELOC
) == 0
1507 || o
->reloc_count
== 0
1508 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1509 && (o
->flags
& SEC_DEBUGGING
) != 0))
1512 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1513 (abfd
, o
, (PTR
) NULL
,
1514 (Elf_Internal_Rela
*) NULL
,
1515 info
->keep_memory
));
1516 if (internal_relocs
== NULL
)
1519 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1521 if (! info
->keep_memory
)
1522 free (internal_relocs
);
1529 /* If this is a non-traditional, non-relocateable link, try to
1530 optimize the handling of the .stab/.stabstr sections. */
1532 && ! info
->relocateable
1533 && ! info
->traditional_format
1534 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1535 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1537 asection
*stab
, *stabstr
;
1539 stab
= bfd_get_section_by_name (abfd
, ".stab");
1542 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1544 if (stabstr
!= NULL
)
1546 struct bfd_elf_section_data
*secdata
;
1548 secdata
= elf_section_data (stab
);
1549 if (! _bfd_link_section_stabs (abfd
,
1550 &elf_hash_table (info
)->stab_info
,
1552 &secdata
->stab_info
))
1567 if (extversym
!= NULL
)
1572 /* Create some sections which will be filled in with dynamic linking
1573 information. ABFD is an input file which requires dynamic sections
1574 to be created. The dynamic sections take up virtual memory space
1575 when the final executable is run, so we need to create them before
1576 addresses are assigned to the output sections. We work out the
1577 actual contents and size of these sections later. */
1580 elf_link_create_dynamic_sections (abfd
, info
)
1582 struct bfd_link_info
*info
;
1585 register asection
*s
;
1586 struct elf_link_hash_entry
*h
;
1587 struct elf_backend_data
*bed
;
1589 if (elf_hash_table (info
)->dynamic_sections_created
)
1592 /* Make sure that all dynamic sections use the same input BFD. */
1593 if (elf_hash_table (info
)->dynobj
== NULL
)
1594 elf_hash_table (info
)->dynobj
= abfd
;
1596 abfd
= elf_hash_table (info
)->dynobj
;
1598 /* Note that we set the SEC_IN_MEMORY flag for all of these
1600 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1601 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1603 /* A dynamically linked executable has a .interp section, but a
1604 shared library does not. */
1607 s
= bfd_make_section (abfd
, ".interp");
1609 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1613 /* Create sections to hold version informations. These are removed
1614 if they are not needed. */
1615 s
= bfd_make_section (abfd
, ".gnu.version_d");
1617 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1618 || ! bfd_set_section_alignment (abfd
, s
, 2))
1621 s
= bfd_make_section (abfd
, ".gnu.version");
1623 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1624 || ! bfd_set_section_alignment (abfd
, s
, 1))
1627 s
= bfd_make_section (abfd
, ".gnu.version_r");
1629 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1630 || ! bfd_set_section_alignment (abfd
, s
, 2))
1633 s
= bfd_make_section (abfd
, ".dynsym");
1635 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1636 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1639 s
= bfd_make_section (abfd
, ".dynstr");
1641 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1644 /* Create a strtab to hold the dynamic symbol names. */
1645 if (elf_hash_table (info
)->dynstr
== NULL
)
1647 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1648 if (elf_hash_table (info
)->dynstr
== NULL
)
1652 s
= bfd_make_section (abfd
, ".dynamic");
1654 || ! bfd_set_section_flags (abfd
, s
, flags
)
1655 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1658 /* The special symbol _DYNAMIC is always set to the start of the
1659 .dynamic section. This call occurs before we have processed the
1660 symbols for any dynamic object, so we don't have to worry about
1661 overriding a dynamic definition. We could set _DYNAMIC in a
1662 linker script, but we only want to define it if we are, in fact,
1663 creating a .dynamic section. We don't want to define it if there
1664 is no .dynamic section, since on some ELF platforms the start up
1665 code examines it to decide how to initialize the process. */
1667 if (! (_bfd_generic_link_add_one_symbol
1668 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1669 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1670 (struct bfd_link_hash_entry
**) &h
)))
1672 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1673 h
->type
= STT_OBJECT
;
1676 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1679 s
= bfd_make_section (abfd
, ".hash");
1681 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1682 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1685 /* Let the backend create the rest of the sections. This lets the
1686 backend set the right flags. The backend will normally create
1687 the .got and .plt sections. */
1688 bed
= get_elf_backend_data (abfd
);
1689 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1692 elf_hash_table (info
)->dynamic_sections_created
= true;
1697 /* Add an entry to the .dynamic table. */
1700 elf_add_dynamic_entry (info
, tag
, val
)
1701 struct bfd_link_info
*info
;
1705 Elf_Internal_Dyn dyn
;
1709 bfd_byte
*newcontents
;
1711 dynobj
= elf_hash_table (info
)->dynobj
;
1713 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1714 BFD_ASSERT (s
!= NULL
);
1716 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1717 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1718 if (newcontents
== NULL
)
1722 dyn
.d_un
.d_val
= val
;
1723 elf_swap_dyn_out (dynobj
, &dyn
,
1724 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1726 s
->_raw_size
= newsize
;
1727 s
->contents
= newcontents
;
1733 /* Read and swap the relocs for a section. They may have been cached.
1734 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1735 they are used as buffers to read into. They are known to be large
1736 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1737 value is allocated using either malloc or bfd_alloc, according to
1738 the KEEP_MEMORY argument. */
1741 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1745 PTR external_relocs
;
1746 Elf_Internal_Rela
*internal_relocs
;
1747 boolean keep_memory
;
1749 Elf_Internal_Shdr
*rel_hdr
;
1751 Elf_Internal_Rela
*alloc2
= NULL
;
1753 if (elf_section_data (o
)->relocs
!= NULL
)
1754 return elf_section_data (o
)->relocs
;
1756 if (o
->reloc_count
== 0)
1759 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1761 if (internal_relocs
== NULL
)
1765 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1767 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1769 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1770 if (internal_relocs
== NULL
)
1774 if (external_relocs
== NULL
)
1776 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1779 external_relocs
= alloc1
;
1782 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1783 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1784 != rel_hdr
->sh_size
))
1787 /* Swap in the relocs. For convenience, we always produce an
1788 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1790 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1792 Elf_External_Rel
*erel
;
1793 Elf_External_Rel
*erelend
;
1794 Elf_Internal_Rela
*irela
;
1796 erel
= (Elf_External_Rel
*) external_relocs
;
1797 erelend
= erel
+ o
->reloc_count
;
1798 irela
= internal_relocs
;
1799 for (; erel
< erelend
; erel
++, irela
++)
1801 Elf_Internal_Rel irel
;
1803 elf_swap_reloc_in (abfd
, erel
, &irel
);
1804 irela
->r_offset
= irel
.r_offset
;
1805 irela
->r_info
= irel
.r_info
;
1806 irela
->r_addend
= 0;
1811 Elf_External_Rela
*erela
;
1812 Elf_External_Rela
*erelaend
;
1813 Elf_Internal_Rela
*irela
;
1815 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1817 erela
= (Elf_External_Rela
*) external_relocs
;
1818 erelaend
= erela
+ o
->reloc_count
;
1819 irela
= internal_relocs
;
1820 for (; erela
< erelaend
; erela
++, irela
++)
1821 elf_swap_reloca_in (abfd
, erela
, irela
);
1824 /* Cache the results for next time, if we can. */
1826 elf_section_data (o
)->relocs
= internal_relocs
;
1831 /* Don't free alloc2, since if it was allocated we are passing it
1832 back (under the name of internal_relocs). */
1834 return internal_relocs
;
1845 /* Record an assignment to a symbol made by a linker script. We need
1846 this in case some dynamic object refers to this symbol. */
1850 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
1852 struct bfd_link_info
*info
;
1856 struct elf_link_hash_entry
*h
;
1858 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1861 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
1865 if (h
->root
.type
== bfd_link_hash_new
)
1866 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
1868 /* If this symbol is being provided by the linker script, and it is
1869 currently defined by a dynamic object, but not by a regular
1870 object, then mark it as undefined so that the generic linker will
1871 force the correct value. */
1873 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1874 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1875 h
->root
.type
= bfd_link_hash_undefined
;
1877 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1878 h
->type
= STT_OBJECT
;
1880 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1881 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
1883 && h
->dynindx
== -1)
1885 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1888 /* If this is a weak defined symbol, and we know a corresponding
1889 real symbol from the same dynamic object, make sure the real
1890 symbol is also made into a dynamic symbol. */
1891 if (h
->weakdef
!= NULL
1892 && h
->weakdef
->dynindx
== -1)
1894 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1902 /* This structure is used to pass information to
1903 elf_link_assign_sym_version. */
1905 struct elf_assign_sym_version_info
1909 /* General link information. */
1910 struct bfd_link_info
*info
;
1912 struct bfd_elf_version_tree
*verdefs
;
1913 /* Whether we are exporting all dynamic symbols. */
1914 boolean export_dynamic
;
1915 /* Whether we removed any symbols from the dynamic symbol table. */
1916 boolean removed_dynamic
;
1917 /* Whether we had a failure. */
1921 /* This structure is used to pass information to
1922 elf_link_find_version_dependencies. */
1924 struct elf_find_verdep_info
1928 /* General link information. */
1929 struct bfd_link_info
*info
;
1930 /* The number of dependencies. */
1932 /* Whether we had a failure. */
1936 /* Array used to determine the number of hash table buckets to use
1937 based on the number of symbols there are. If there are fewer than
1938 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1939 fewer than 37 we use 17 buckets, and so forth. We never use more
1940 than 32771 buckets. */
1942 static const size_t elf_buckets
[] =
1944 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
1948 /* Set up the sizes and contents of the ELF dynamic sections. This is
1949 called by the ELF linker emulation before_allocation routine. We
1950 must set the sizes of the sections before the linker sets the
1951 addresses of the various sections. */
1954 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
1955 export_dynamic
, filter_shlib
,
1956 auxiliary_filters
, info
, sinterpptr
,
1961 boolean export_dynamic
;
1962 const char *filter_shlib
;
1963 const char * const *auxiliary_filters
;
1964 struct bfd_link_info
*info
;
1965 asection
**sinterpptr
;
1966 struct bfd_elf_version_tree
*verdefs
;
1968 bfd_size_type soname_indx
;
1970 struct elf_backend_data
*bed
;
1971 bfd_size_type old_dynsymcount
;
1977 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1980 /* The backend may have to create some sections regardless of whether
1981 we're dynamic or not. */
1982 bed
= get_elf_backend_data (output_bfd
);
1983 if (bed
->elf_backend_always_size_sections
1984 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
1987 dynobj
= elf_hash_table (info
)->dynobj
;
1989 /* If there were no dynamic objects in the link, there is nothing to
1994 /* If we are supposed to export all symbols into the dynamic symbol
1995 table (this is not the normal case), then do so. */
1998 struct elf_info_failed eif
;
2002 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2008 if (elf_hash_table (info
)->dynamic_sections_created
)
2010 struct elf_info_failed eif
;
2011 struct elf_link_hash_entry
*h
;
2012 bfd_size_type strsize
;
2014 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2015 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2019 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2020 soname
, true, true);
2021 if (soname_indx
== (bfd_size_type
) -1
2022 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2028 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2036 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2038 if (indx
== (bfd_size_type
) -1
2039 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2043 if (filter_shlib
!= NULL
)
2047 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2048 filter_shlib
, true, true);
2049 if (indx
== (bfd_size_type
) -1
2050 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2054 if (auxiliary_filters
!= NULL
)
2056 const char * const *p
;
2058 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2062 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2064 if (indx
== (bfd_size_type
) -1
2065 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2070 /* Find all symbols which were defined in a dynamic object and make
2071 the backend pick a reasonable value for them. */
2074 elf_link_hash_traverse (elf_hash_table (info
),
2075 elf_adjust_dynamic_symbol
,
2080 /* Add some entries to the .dynamic section. We fill in some of the
2081 values later, in elf_bfd_final_link, but we must add the entries
2082 now so that we know the final size of the .dynamic section. */
2083 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2086 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2087 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2089 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2092 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2095 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2096 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2098 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2101 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2102 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2103 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2104 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2105 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2106 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2107 sizeof (Elf_External_Sym
)))
2111 /* The backend must work out the sizes of all the other dynamic
2113 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2114 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2117 if (elf_hash_table (info
)->dynamic_sections_created
)
2122 size_t bucketcount
= 0;
2123 Elf_Internal_Sym isym
;
2124 struct elf_assign_sym_version_info sinfo
;
2126 /* Set up the version definition section. */
2127 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2128 BFD_ASSERT (s
!= NULL
);
2130 /* Attach all the symbols to their version information. This
2131 may cause some symbols to be unexported. */
2132 sinfo
.output_bfd
= output_bfd
;
2134 sinfo
.verdefs
= verdefs
;
2135 sinfo
.export_dynamic
= export_dynamic
;
2136 sinfo
.removed_dynamic
= false;
2137 sinfo
.failed
= false;
2139 elf_link_hash_traverse (elf_hash_table (info
),
2140 elf_link_assign_sym_version
,
2145 /* We may have created additional version definitions if we are
2146 just linking a regular application. */
2147 verdefs
= sinfo
.verdefs
;
2149 if (verdefs
== NULL
)
2153 /* Don't include this section in the output file. */
2154 for (spp
= &output_bfd
->sections
;
2155 *spp
!= s
->output_section
;
2156 spp
= &(*spp
)->next
)
2158 *spp
= s
->output_section
->next
;
2159 --output_bfd
->section_count
;
2165 struct bfd_elf_version_tree
*t
;
2167 Elf_Internal_Verdef def
;
2168 Elf_Internal_Verdaux defaux
;
2170 if (sinfo
.removed_dynamic
)
2172 /* Some dynamic symbols were changed to be local
2173 symbols. In this case, we renumber all of the
2174 dynamic symbols, so that we don't have a hole. If
2175 the backend changed dynsymcount, then assume that the
2176 new symbols are at the start. This is the case on
2177 the MIPS. FIXME: The names of the removed symbols
2178 will still be in the dynamic string table, wasting
2180 elf_hash_table (info
)->dynsymcount
=
2181 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2182 elf_link_hash_traverse (elf_hash_table (info
),
2183 elf_link_renumber_dynsyms
,
2190 /* Make space for the base version. */
2191 size
+= sizeof (Elf_External_Verdef
);
2192 size
+= sizeof (Elf_External_Verdaux
);
2195 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2197 struct bfd_elf_version_deps
*n
;
2199 size
+= sizeof (Elf_External_Verdef
);
2200 size
+= sizeof (Elf_External_Verdaux
);
2203 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2204 size
+= sizeof (Elf_External_Verdaux
);
2207 s
->_raw_size
= size
;
2208 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2209 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2212 /* Fill in the version definition section. */
2216 def
.vd_version
= VER_DEF_CURRENT
;
2217 def
.vd_flags
= VER_FLG_BASE
;
2220 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2221 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2222 + sizeof (Elf_External_Verdaux
));
2224 if (soname_indx
!= -1)
2226 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2227 defaux
.vda_name
= soname_indx
;
2234 name
= output_bfd
->filename
;
2235 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2236 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2238 if (indx
== (bfd_size_type
) -1)
2240 defaux
.vda_name
= indx
;
2242 defaux
.vda_next
= 0;
2244 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2245 (Elf_External_Verdef
*)p
);
2246 p
+= sizeof (Elf_External_Verdef
);
2247 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2248 (Elf_External_Verdaux
*) p
);
2249 p
+= sizeof (Elf_External_Verdaux
);
2251 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2254 struct bfd_elf_version_deps
*n
;
2255 struct elf_link_hash_entry
*h
;
2258 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2261 /* Add a symbol representing this version. */
2263 if (! (_bfd_generic_link_add_one_symbol
2264 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2265 (bfd_vma
) 0, (const char *) NULL
, false,
2266 get_elf_backend_data (dynobj
)->collect
,
2267 (struct bfd_link_hash_entry
**) &h
)))
2269 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2270 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2271 h
->type
= STT_OBJECT
;
2272 h
->verinfo
.vertree
= t
;
2274 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2277 def
.vd_version
= VER_DEF_CURRENT
;
2279 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2280 def
.vd_flags
|= VER_FLG_WEAK
;
2281 def
.vd_ndx
= t
->vernum
+ 1;
2282 def
.vd_cnt
= cdeps
+ 1;
2283 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2284 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2285 if (t
->next
!= NULL
)
2286 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2287 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2291 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2292 (Elf_External_Verdef
*) p
);
2293 p
+= sizeof (Elf_External_Verdef
);
2295 defaux
.vda_name
= h
->dynstr_index
;
2296 if (t
->deps
== NULL
)
2297 defaux
.vda_next
= 0;
2299 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2300 t
->name_indx
= defaux
.vda_name
;
2302 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2303 (Elf_External_Verdaux
*) p
);
2304 p
+= sizeof (Elf_External_Verdaux
);
2306 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2308 defaux
.vda_name
= n
->version_needed
->name_indx
;
2309 if (n
->next
== NULL
)
2310 defaux
.vda_next
= 0;
2312 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2314 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2315 (Elf_External_Verdaux
*) p
);
2316 p
+= sizeof (Elf_External_Verdaux
);
2320 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2321 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2324 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2327 /* Work out the size of the version reference section. */
2329 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2330 BFD_ASSERT (s
!= NULL
);
2332 struct elf_find_verdep_info sinfo
;
2334 sinfo
.output_bfd
= output_bfd
;
2336 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2337 if (sinfo
.vers
== 0)
2339 sinfo
.failed
= false;
2341 elf_link_hash_traverse (elf_hash_table (info
),
2342 elf_link_find_version_dependencies
,
2345 if (elf_tdata (output_bfd
)->verref
== NULL
)
2349 /* We don't have any version definitions, so we can just
2350 remove the section. */
2352 for (spp
= &output_bfd
->sections
;
2353 *spp
!= s
->output_section
;
2354 spp
= &(*spp
)->next
)
2356 *spp
= s
->output_section
->next
;
2357 --output_bfd
->section_count
;
2361 Elf_Internal_Verneed
*t
;
2366 /* Build the version definition section. */
2369 for (t
= elf_tdata (output_bfd
)->verref
;
2373 Elf_Internal_Vernaux
*a
;
2375 size
+= sizeof (Elf_External_Verneed
);
2377 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2378 size
+= sizeof (Elf_External_Vernaux
);
2381 s
->_raw_size
= size
;
2382 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2383 if (s
->contents
== NULL
)
2387 for (t
= elf_tdata (output_bfd
)->verref
;
2392 Elf_Internal_Vernaux
*a
;
2396 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2399 t
->vn_version
= VER_NEED_CURRENT
;
2401 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2402 t
->vn_bfd
->filename
, true, false);
2403 if (indx
== (bfd_size_type
) -1)
2406 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2407 if (t
->vn_nextref
== NULL
)
2410 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2411 + caux
* sizeof (Elf_External_Vernaux
));
2413 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2414 (Elf_External_Verneed
*) p
);
2415 p
+= sizeof (Elf_External_Verneed
);
2417 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2419 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2421 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2422 a
->vna_nodename
, true, false);
2423 if (indx
== (bfd_size_type
) -1)
2426 if (a
->vna_nextptr
== NULL
)
2429 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2431 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2432 (Elf_External_Vernaux
*) p
);
2433 p
+= sizeof (Elf_External_Vernaux
);
2437 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2438 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2441 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2445 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2447 /* Work out the size of the symbol version section. */
2448 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2449 BFD_ASSERT (s
!= NULL
);
2450 if (dynsymcount
== 0
2451 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2455 /* We don't need any symbol versions; just discard the
2457 for (spp
= &output_bfd
->sections
;
2458 *spp
!= s
->output_section
;
2459 spp
= &(*spp
)->next
)
2461 *spp
= s
->output_section
->next
;
2462 --output_bfd
->section_count
;
2466 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2467 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2468 if (s
->contents
== NULL
)
2471 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2475 /* Set the size of the .dynsym and .hash sections. We counted
2476 the number of dynamic symbols in elf_link_add_object_symbols.
2477 We will build the contents of .dynsym and .hash when we build
2478 the final symbol table, because until then we do not know the
2479 correct value to give the symbols. We built the .dynstr
2480 section as we went along in elf_link_add_object_symbols. */
2481 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2482 BFD_ASSERT (s
!= NULL
);
2483 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2484 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2485 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2488 /* The first entry in .dynsym is a dummy symbol. */
2495 elf_swap_symbol_out (output_bfd
, &isym
,
2496 (PTR
) (Elf_External_Sym
*) s
->contents
);
2498 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2500 bucketcount
= elf_buckets
[i
];
2501 if (dynsymcount
< elf_buckets
[i
+ 1])
2505 s
= bfd_get_section_by_name (dynobj
, ".hash");
2506 BFD_ASSERT (s
!= NULL
);
2507 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2508 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2509 if (s
->contents
== NULL
)
2511 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2513 put_word (output_bfd
, bucketcount
, s
->contents
);
2514 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2516 elf_hash_table (info
)->bucketcount
= bucketcount
;
2518 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2519 BFD_ASSERT (s
!= NULL
);
2520 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2522 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2529 /* Make the backend pick a good value for a dynamic symbol. This is
2530 called via elf_link_hash_traverse, and also calls itself
2534 elf_adjust_dynamic_symbol (h
, data
)
2535 struct elf_link_hash_entry
*h
;
2538 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2540 struct elf_backend_data
*bed
;
2542 /* Ignore indirect symbols. These are added by the versioning code. */
2543 if (h
->root
.type
== bfd_link_hash_indirect
)
2546 /* If this symbol was mentioned in a non-ELF file, try to set
2547 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2548 permit a non-ELF file to correctly refer to a symbol defined in
2549 an ELF dynamic object. */
2550 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2552 if (h
->root
.type
!= bfd_link_hash_defined
2553 && h
->root
.type
!= bfd_link_hash_defweak
)
2554 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2557 if (h
->root
.u
.def
.section
->owner
!= NULL
2558 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2559 == bfd_target_elf_flavour
))
2560 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2562 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2565 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2566 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
2568 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2576 /* If this is a final link, and the symbol was defined as a common
2577 symbol in a regular object file, and there was no definition in
2578 any dynamic object, then the linker will have allocated space for
2579 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2580 flag will not have been set. */
2581 if (h
->root
.type
== bfd_link_hash_defined
2582 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2583 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2584 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2585 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2586 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2588 /* If -Bsymbolic was used (which means to bind references to global
2589 symbols to the definition within the shared object), and this
2590 symbol was defined in a regular object, then it actually doesn't
2591 need a PLT entry. */
2592 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2593 && eif
->info
->shared
2594 && eif
->info
->symbolic
2595 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2596 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2598 /* If this symbol does not require a PLT entry, and it is not
2599 defined by a dynamic object, or is not referenced by a regular
2600 object, ignore it. We do have to handle a weak defined symbol,
2601 even if no regular object refers to it, if we decided to add it
2602 to the dynamic symbol table. FIXME: Do we normally need to worry
2603 about symbols which are defined by one dynamic object and
2604 referenced by another one? */
2605 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2606 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2607 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2608 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2609 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2612 /* If we've already adjusted this symbol, don't do it again. This
2613 can happen via a recursive call. */
2614 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2617 /* Don't look at this symbol again. Note that we must set this
2618 after checking the above conditions, because we may look at a
2619 symbol once, decide not to do anything, and then get called
2620 recursively later after REF_REGULAR is set below. */
2621 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2623 /* If this is a weak definition, and we know a real definition, and
2624 the real symbol is not itself defined by a regular object file,
2625 then get a good value for the real definition. We handle the
2626 real symbol first, for the convenience of the backend routine.
2628 Note that there is a confusing case here. If the real definition
2629 is defined by a regular object file, we don't get the real symbol
2630 from the dynamic object, but we do get the weak symbol. If the
2631 processor backend uses a COPY reloc, then if some routine in the
2632 dynamic object changes the real symbol, we will not see that
2633 change in the corresponding weak symbol. This is the way other
2634 ELF linkers work as well, and seems to be a result of the shared
2637 I will clarify this issue. Most SVR4 shared libraries define the
2638 variable _timezone and define timezone as a weak synonym. The
2639 tzset call changes _timezone. If you write
2640 extern int timezone;
2642 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2643 you might expect that, since timezone is a synonym for _timezone,
2644 the same number will print both times. However, if the processor
2645 backend uses a COPY reloc, then actually timezone will be copied
2646 into your process image, and, since you define _timezone
2647 yourself, _timezone will not. Thus timezone and _timezone will
2648 wind up at different memory locations. The tzset call will set
2649 _timezone, leaving timezone unchanged. */
2651 if (h
->weakdef
!= NULL
)
2653 struct elf_link_hash_entry
*weakdef
;
2655 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2656 || h
->root
.type
== bfd_link_hash_defweak
);
2657 weakdef
= h
->weakdef
;
2658 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2659 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2660 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2661 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2663 /* This symbol is defined by a regular object file, so we
2664 will not do anything special. Clear weakdef for the
2665 convenience of the processor backend. */
2670 /* There is an implicit reference by a regular object file
2671 via the weak symbol. */
2672 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2673 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2678 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2679 bed
= get_elf_backend_data (dynobj
);
2680 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2689 /* This routine is used to export all defined symbols into the dynamic
2690 symbol table. It is called via elf_link_hash_traverse. */
2693 elf_export_symbol (h
, data
)
2694 struct elf_link_hash_entry
*h
;
2697 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2699 /* Ignore indirect symbols. These are added by the versioning code. */
2700 if (h
->root
.type
== bfd_link_hash_indirect
)
2703 if (h
->dynindx
== -1
2704 && (h
->elf_link_hash_flags
2705 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2707 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2717 /* Look through the symbols which are defined in other shared
2718 libraries and referenced here. Update the list of version
2719 dependencies. This will be put into the .gnu.version_r section.
2720 This function is called via elf_link_hash_traverse. */
2723 elf_link_find_version_dependencies (h
, data
)
2724 struct elf_link_hash_entry
*h
;
2727 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2728 Elf_Internal_Verneed
*t
;
2729 Elf_Internal_Vernaux
*a
;
2731 /* We only care about symbols defined in shared objects with version
2733 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2734 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2736 || h
->verinfo
.verdef
== NULL
)
2739 /* See if we already know about this version. */
2740 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
2742 if (t
->vn_bfd
== h
->verinfo
.verdef
->vd_bfd
)
2745 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2746 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2752 /* This is a new version. Add it to tree we are building. */
2756 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
2759 rinfo
->failed
= true;
2763 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2764 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
2765 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
2768 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
2770 /* Note that we are copying a string pointer here, and testing it
2771 above. If bfd_elf_string_from_elf_section is ever changed to
2772 discard the string data when low in memory, this will have to be
2774 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2776 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2777 a
->vna_nextptr
= t
->vn_auxptr
;
2779 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2782 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2789 /* Figure out appropriate versions for all the symbols. We may not
2790 have the version number script until we have read all of the input
2791 files, so until that point we don't know which symbols should be
2792 local. This function is called via elf_link_hash_traverse. */
2795 elf_link_assign_sym_version (h
, data
)
2796 struct elf_link_hash_entry
*h
;
2799 struct elf_assign_sym_version_info
*sinfo
=
2800 (struct elf_assign_sym_version_info
*) data
;
2801 struct bfd_link_info
*info
= sinfo
->info
;
2804 /* We only need version numbers for symbols defined in regular
2806 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2809 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2810 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2812 struct bfd_elf_version_tree
*t
;
2817 /* There are two consecutive ELF_VER_CHR characters if this is
2818 not a hidden symbol. */
2820 if (*p
== ELF_VER_CHR
)
2826 /* If there is no version string, we can just return out. */
2830 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
2834 /* Look for the version. If we find it, it is no longer weak. */
2835 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
2837 if (strcmp (t
->name
, p
) == 0)
2839 h
->verinfo
.vertree
= t
;
2842 /* See if there is anything to force this symbol to
2844 if (t
->locals
!= NULL
)
2848 struct bfd_elf_version_expr
*d
;
2850 len
= p
- h
->root
.root
.string
;
2851 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
2854 strncpy (alc
, h
->root
.root
.string
, len
- 1);
2855 alc
[len
- 1] = '\0';
2856 if (alc
[len
- 2] == ELF_VER_CHR
)
2857 alc
[len
- 2] = '\0';
2859 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
2861 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
2862 || fnmatch (d
->match
, alc
, 0) == 0)
2864 if (h
->dynindx
!= -1
2866 && ! sinfo
->export_dynamic
2867 && (h
->elf_link_hash_flags
2868 & ELF_LINK_HASH_NEEDS_PLT
) == 0)
2870 sinfo
->removed_dynamic
= true;
2871 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
2873 /* FIXME: The name of the symbol has
2874 already been recorded in the dynamic
2875 string table section. */
2882 bfd_release (sinfo
->output_bfd
, alc
);
2889 /* If we are building an application, we need to create a
2890 version node for this version. */
2891 if (t
== NULL
&& ! info
->shared
)
2893 struct bfd_elf_version_tree
**pp
;
2896 /* If we aren't going to export this symbol, we don't need
2897 to worry about it. */
2898 if (h
->dynindx
== -1)
2901 t
= ((struct bfd_elf_version_tree
*)
2902 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
2905 sinfo
->failed
= true;
2914 t
->name_indx
= (unsigned int) -1;
2918 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2920 t
->vernum
= version_index
;
2924 h
->verinfo
.vertree
= t
;
2928 /* We could not find the version for a symbol when
2929 generating a shared archive. Return an error. */
2930 (*_bfd_error_handler
)
2931 ("%s: undefined version name %s",
2932 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
2933 bfd_set_error (bfd_error_bad_value
);
2934 sinfo
->failed
= true;
2939 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
2942 /* If we don't have a version for this symbol, see if we can find
2944 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
2946 struct bfd_elf_version_tree
*t
;
2947 struct bfd_elf_version_tree
*deflt
;
2948 struct bfd_elf_version_expr
*d
;
2950 /* See if can find what version this symbol is in. If the
2951 symbol is supposed to eb local, then don't actually register
2954 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
2956 if (t
->globals
!= NULL
)
2958 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
2960 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
2962 h
->verinfo
.vertree
= t
;
2971 if (t
->locals
!= NULL
)
2973 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
2975 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
2977 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
2979 h
->verinfo
.vertree
= t
;
2980 if (h
->dynindx
!= -1
2982 && ! sinfo
->export_dynamic
2983 && (h
->elf_link_hash_flags
2984 & ELF_LINK_HASH_NEEDS_PLT
) == 0)
2986 sinfo
->removed_dynamic
= true;
2987 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
2989 /* FIXME: The name of the symbol has already
2990 been recorded in the dynamic string table
3002 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3004 h
->verinfo
.vertree
= deflt
;
3005 if (h
->dynindx
!= -1
3007 && ! sinfo
->export_dynamic
3008 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3010 sinfo
->removed_dynamic
= true;
3011 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3013 /* FIXME: The name of the symbol has already been
3014 recorded in the dynamic string table section. */
3022 /* This function is used to renumber the dynamic symbols, if some of
3023 them are removed because they are marked as local. This is called
3024 via elf_link_hash_traverse. */
3027 elf_link_renumber_dynsyms (h
, data
)
3028 struct elf_link_hash_entry
*h
;
3031 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3033 if (h
->dynindx
!= -1)
3035 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3036 ++elf_hash_table (info
)->dynsymcount
;
3042 /* Final phase of ELF linker. */
3044 /* A structure we use to avoid passing large numbers of arguments. */
3046 struct elf_final_link_info
3048 /* General link information. */
3049 struct bfd_link_info
*info
;
3052 /* Symbol string table. */
3053 struct bfd_strtab_hash
*symstrtab
;
3054 /* .dynsym section. */
3055 asection
*dynsym_sec
;
3056 /* .hash section. */
3058 /* symbol version section (.gnu.version). */
3059 asection
*symver_sec
;
3060 /* Buffer large enough to hold contents of any section. */
3062 /* Buffer large enough to hold external relocs of any section. */
3063 PTR external_relocs
;
3064 /* Buffer large enough to hold internal relocs of any section. */
3065 Elf_Internal_Rela
*internal_relocs
;
3066 /* Buffer large enough to hold external local symbols of any input
3068 Elf_External_Sym
*external_syms
;
3069 /* Buffer large enough to hold internal local symbols of any input
3071 Elf_Internal_Sym
*internal_syms
;
3072 /* Array large enough to hold a symbol index for each local symbol
3073 of any input BFD. */
3075 /* Array large enough to hold a section pointer for each local
3076 symbol of any input BFD. */
3077 asection
**sections
;
3078 /* Buffer to hold swapped out symbols. */
3079 Elf_External_Sym
*symbuf
;
3080 /* Number of swapped out symbols in buffer. */
3081 size_t symbuf_count
;
3082 /* Number of symbols which fit in symbuf. */
3086 static boolean elf_link_output_sym
3087 PARAMS ((struct elf_final_link_info
*, const char *,
3088 Elf_Internal_Sym
*, asection
*));
3089 static boolean elf_link_flush_output_syms
3090 PARAMS ((struct elf_final_link_info
*));
3091 static boolean elf_link_output_extsym
3092 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3093 static boolean elf_link_input_bfd
3094 PARAMS ((struct elf_final_link_info
*, bfd
*));
3095 static boolean elf_reloc_link_order
3096 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3097 struct bfd_link_order
*));
3099 /* This struct is used to pass information to elf_link_output_extsym. */
3101 struct elf_outext_info
3105 struct elf_final_link_info
*finfo
;
3108 /* Do the final step of an ELF link. */
3111 elf_bfd_final_link (abfd
, info
)
3113 struct bfd_link_info
*info
;
3117 struct elf_final_link_info finfo
;
3118 register asection
*o
;
3119 register struct bfd_link_order
*p
;
3121 size_t max_contents_size
;
3122 size_t max_external_reloc_size
;
3123 size_t max_internal_reloc_count
;
3124 size_t max_sym_count
;
3126 Elf_Internal_Sym elfsym
;
3128 Elf_Internal_Shdr
*symtab_hdr
;
3129 Elf_Internal_Shdr
*symstrtab_hdr
;
3130 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3131 struct elf_outext_info eoinfo
;
3134 abfd
->flags
|= DYNAMIC
;
3136 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3137 dynobj
= elf_hash_table (info
)->dynobj
;
3140 finfo
.output_bfd
= abfd
;
3141 finfo
.symstrtab
= elf_stringtab_init ();
3142 if (finfo
.symstrtab
== NULL
)
3147 finfo
.dynsym_sec
= NULL
;
3148 finfo
.hash_sec
= NULL
;
3149 finfo
.symver_sec
= NULL
;
3153 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3154 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3155 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3156 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3157 /* Note that it is OK if symver_sec is NULL. */
3160 finfo
.contents
= NULL
;
3161 finfo
.external_relocs
= NULL
;
3162 finfo
.internal_relocs
= NULL
;
3163 finfo
.external_syms
= NULL
;
3164 finfo
.internal_syms
= NULL
;
3165 finfo
.indices
= NULL
;
3166 finfo
.sections
= NULL
;
3167 finfo
.symbuf
= NULL
;
3168 finfo
.symbuf_count
= 0;
3170 /* Count up the number of relocations we will output for each output
3171 section, so that we know the sizes of the reloc sections. We
3172 also figure out some maximum sizes. */
3173 max_contents_size
= 0;
3174 max_external_reloc_size
= 0;
3175 max_internal_reloc_count
= 0;
3177 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3181 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3183 if (p
->type
== bfd_section_reloc_link_order
3184 || p
->type
== bfd_symbol_reloc_link_order
)
3186 else if (p
->type
== bfd_indirect_link_order
)
3190 sec
= p
->u
.indirect
.section
;
3192 /* Mark all sections which are to be included in the
3193 link. This will normally be every section. We need
3194 to do this so that we can identify any sections which
3195 the linker has decided to not include. */
3196 sec
->linker_mark
= true;
3198 if (info
->relocateable
)
3199 o
->reloc_count
+= sec
->reloc_count
;
3201 if (sec
->_raw_size
> max_contents_size
)
3202 max_contents_size
= sec
->_raw_size
;
3203 if (sec
->_cooked_size
> max_contents_size
)
3204 max_contents_size
= sec
->_cooked_size
;
3206 /* We are interested in just local symbols, not all
3208 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3209 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3213 if (elf_bad_symtab (sec
->owner
))
3214 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3215 / sizeof (Elf_External_Sym
));
3217 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3219 if (sym_count
> max_sym_count
)
3220 max_sym_count
= sym_count
;
3222 if ((sec
->flags
& SEC_RELOC
) != 0)
3226 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3227 if (ext_size
> max_external_reloc_size
)
3228 max_external_reloc_size
= ext_size
;
3229 if (sec
->reloc_count
> max_internal_reloc_count
)
3230 max_internal_reloc_count
= sec
->reloc_count
;
3236 if (o
->reloc_count
> 0)
3237 o
->flags
|= SEC_RELOC
;
3240 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3241 set it (this is probably a bug) and if it is set
3242 assign_section_numbers will create a reloc section. */
3243 o
->flags
&=~ SEC_RELOC
;
3246 /* If the SEC_ALLOC flag is not set, force the section VMA to
3247 zero. This is done in elf_fake_sections as well, but forcing
3248 the VMA to 0 here will ensure that relocs against these
3249 sections are handled correctly. */
3250 if ((o
->flags
& SEC_ALLOC
) == 0
3251 && ! o
->user_set_vma
)
3255 /* Figure out the file positions for everything but the symbol table
3256 and the relocs. We set symcount to force assign_section_numbers
3257 to create a symbol table. */
3258 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3259 BFD_ASSERT (! abfd
->output_has_begun
);
3260 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3263 /* That created the reloc sections. Set their sizes, and assign
3264 them file positions, and allocate some buffers. */
3265 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3267 if ((o
->flags
& SEC_RELOC
) != 0)
3269 Elf_Internal_Shdr
*rel_hdr
;
3270 register struct elf_link_hash_entry
**p
, **pend
;
3272 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3274 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3276 /* The contents field must last into write_object_contents,
3277 so we allocate it with bfd_alloc rather than malloc. */
3278 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3279 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3282 p
= ((struct elf_link_hash_entry
**)
3283 bfd_malloc (o
->reloc_count
3284 * sizeof (struct elf_link_hash_entry
*)));
3285 if (p
== NULL
&& o
->reloc_count
!= 0)
3287 elf_section_data (o
)->rel_hashes
= p
;
3288 pend
= p
+ o
->reloc_count
;
3289 for (; p
< pend
; p
++)
3292 /* Use the reloc_count field as an index when outputting the
3298 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3300 /* We have now assigned file positions for all the sections except
3301 .symtab and .strtab. We start the .symtab section at the current
3302 file position, and write directly to it. We build the .strtab
3303 section in memory. */
3305 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3306 /* sh_name is set in prep_headers. */
3307 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3308 symtab_hdr
->sh_flags
= 0;
3309 symtab_hdr
->sh_addr
= 0;
3310 symtab_hdr
->sh_size
= 0;
3311 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3312 /* sh_link is set in assign_section_numbers. */
3313 /* sh_info is set below. */
3314 /* sh_offset is set just below. */
3315 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3317 off
= elf_tdata (abfd
)->next_file_pos
;
3318 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3320 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3321 incorrect. We do not yet know the size of the .symtab section.
3322 We correct next_file_pos below, after we do know the size. */
3324 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3325 continuously seeking to the right position in the file. */
3326 if (! info
->keep_memory
|| max_sym_count
< 20)
3327 finfo
.symbuf_size
= 20;
3329 finfo
.symbuf_size
= max_sym_count
;
3330 finfo
.symbuf
= ((Elf_External_Sym
*)
3331 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3332 if (finfo
.symbuf
== NULL
)
3335 /* Start writing out the symbol table. The first symbol is always a
3337 if (info
->strip
!= strip_all
|| info
->relocateable
)
3339 elfsym
.st_value
= 0;
3342 elfsym
.st_other
= 0;
3343 elfsym
.st_shndx
= SHN_UNDEF
;
3344 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3345 &elfsym
, bfd_und_section_ptr
))
3350 /* Some standard ELF linkers do this, but we don't because it causes
3351 bootstrap comparison failures. */
3352 /* Output a file symbol for the output file as the second symbol.
3353 We output this even if we are discarding local symbols, although
3354 I'm not sure if this is correct. */
3355 elfsym
.st_value
= 0;
3357 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3358 elfsym
.st_other
= 0;
3359 elfsym
.st_shndx
= SHN_ABS
;
3360 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3361 &elfsym
, bfd_abs_section_ptr
))
3365 /* Output a symbol for each section. We output these even if we are
3366 discarding local symbols, since they are used for relocs. These
3367 symbols have no names. We store the index of each one in the
3368 index field of the section, so that we can find it again when
3369 outputting relocs. */
3370 if (info
->strip
!= strip_all
|| info
->relocateable
)
3373 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3374 elfsym
.st_other
= 0;
3375 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3377 o
= section_from_elf_index (abfd
, i
);
3379 o
->target_index
= abfd
->symcount
;
3380 elfsym
.st_shndx
= i
;
3381 if (info
->relocateable
|| o
== NULL
)
3382 elfsym
.st_value
= 0;
3384 elfsym
.st_value
= o
->vma
;
3385 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3391 /* Allocate some memory to hold information read in from the input
3393 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3394 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3395 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3396 bfd_malloc (max_internal_reloc_count
3397 * sizeof (Elf_Internal_Rela
)));
3398 finfo
.external_syms
= ((Elf_External_Sym
*)
3399 bfd_malloc (max_sym_count
3400 * sizeof (Elf_External_Sym
)));
3401 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3402 bfd_malloc (max_sym_count
3403 * sizeof (Elf_Internal_Sym
)));
3404 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3405 finfo
.sections
= ((asection
**)
3406 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3407 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3408 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3409 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3410 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3411 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3412 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3413 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3416 /* Since ELF permits relocations to be against local symbols, we
3417 must have the local symbols available when we do the relocations.
3418 Since we would rather only read the local symbols once, and we
3419 would rather not keep them in memory, we handle all the
3420 relocations for a single input file at the same time.
3422 Unfortunately, there is no way to know the total number of local
3423 symbols until we have seen all of them, and the local symbol
3424 indices precede the global symbol indices. This means that when
3425 we are generating relocateable output, and we see a reloc against
3426 a global symbol, we can not know the symbol index until we have
3427 finished examining all the local symbols to see which ones we are
3428 going to output. To deal with this, we keep the relocations in
3429 memory, and don't output them until the end of the link. This is
3430 an unfortunate waste of memory, but I don't see a good way around
3431 it. Fortunately, it only happens when performing a relocateable
3432 link, which is not the common case. FIXME: If keep_memory is set
3433 we could write the relocs out and then read them again; I don't
3434 know how bad the memory loss will be. */
3436 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3437 sub
->output_has_begun
= false;
3438 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3440 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3442 if (p
->type
== bfd_indirect_link_order
3443 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3444 == bfd_target_elf_flavour
))
3446 sub
= p
->u
.indirect
.section
->owner
;
3447 if (! sub
->output_has_begun
)
3449 if (! elf_link_input_bfd (&finfo
, sub
))
3451 sub
->output_has_begun
= true;
3454 else if (p
->type
== bfd_section_reloc_link_order
3455 || p
->type
== bfd_symbol_reloc_link_order
)
3457 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3462 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3468 /* That wrote out all the local symbols. Finish up the symbol table
3469 with the global symbols. */
3471 if (info
->strip
!= strip_all
&& info
->shared
)
3473 /* Output any global symbols that got converted to local in a
3474 version script. We do this in a separate step since ELF
3475 requires all local symbols to appear prior to any global
3476 symbols. FIXME: We should only do this if some global
3477 symbols were, in fact, converted to become local. FIXME:
3478 Will this work correctly with the Irix 5 linker? */
3479 eoinfo
.failed
= false;
3480 eoinfo
.finfo
= &finfo
;
3481 eoinfo
.localsyms
= true;
3482 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3488 /* The sh_info field records the index of the first non local
3490 symtab_hdr
->sh_info
= abfd
->symcount
;
3492 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3494 /* We get the global symbols from the hash table. */
3495 eoinfo
.failed
= false;
3496 eoinfo
.localsyms
= false;
3497 eoinfo
.finfo
= &finfo
;
3498 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3503 /* Flush all symbols to the file. */
3504 if (! elf_link_flush_output_syms (&finfo
))
3507 /* Now we know the size of the symtab section. */
3508 off
+= symtab_hdr
->sh_size
;
3510 /* Finish up and write out the symbol string table (.strtab)
3512 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3513 /* sh_name was set in prep_headers. */
3514 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3515 symstrtab_hdr
->sh_flags
= 0;
3516 symstrtab_hdr
->sh_addr
= 0;
3517 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3518 symstrtab_hdr
->sh_entsize
= 0;
3519 symstrtab_hdr
->sh_link
= 0;
3520 symstrtab_hdr
->sh_info
= 0;
3521 /* sh_offset is set just below. */
3522 symstrtab_hdr
->sh_addralign
= 1;
3524 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3525 elf_tdata (abfd
)->next_file_pos
= off
;
3527 if (abfd
->symcount
> 0)
3529 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3530 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3534 /* Adjust the relocs to have the correct symbol indices. */
3535 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3537 struct elf_link_hash_entry
**rel_hash
;
3538 Elf_Internal_Shdr
*rel_hdr
;
3540 if ((o
->flags
& SEC_RELOC
) == 0)
3543 rel_hash
= elf_section_data (o
)->rel_hashes
;
3544 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3545 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3547 if (*rel_hash
== NULL
)
3550 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3552 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3554 Elf_External_Rel
*erel
;
3555 Elf_Internal_Rel irel
;
3557 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3558 elf_swap_reloc_in (abfd
, erel
, &irel
);
3559 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3560 ELF_R_TYPE (irel
.r_info
));
3561 elf_swap_reloc_out (abfd
, &irel
, erel
);
3565 Elf_External_Rela
*erela
;
3566 Elf_Internal_Rela irela
;
3568 BFD_ASSERT (rel_hdr
->sh_entsize
3569 == sizeof (Elf_External_Rela
));
3571 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3572 elf_swap_reloca_in (abfd
, erela
, &irela
);
3573 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3574 ELF_R_TYPE (irela
.r_info
));
3575 elf_swap_reloca_out (abfd
, &irela
, erela
);
3579 /* Set the reloc_count field to 0 to prevent write_relocs from
3580 trying to swap the relocs out itself. */
3584 /* If we are linking against a dynamic object, or generating a
3585 shared library, finish up the dynamic linking information. */
3588 Elf_External_Dyn
*dyncon
, *dynconend
;
3590 /* Fix up .dynamic entries. */
3591 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3592 BFD_ASSERT (o
!= NULL
);
3594 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3595 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3596 for (; dyncon
< dynconend
; dyncon
++)
3598 Elf_Internal_Dyn dyn
;
3602 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3609 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3610 magic _init and _fini symbols. This is pretty ugly,
3611 but we are compatible. */
3619 struct elf_link_hash_entry
*h
;
3621 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3622 false, false, true);
3624 && (h
->root
.type
== bfd_link_hash_defined
3625 || h
->root
.type
== bfd_link_hash_defweak
))
3627 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3628 o
= h
->root
.u
.def
.section
;
3629 if (o
->output_section
!= NULL
)
3630 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3631 + o
->output_offset
);
3634 /* The symbol is imported from another shared
3635 library and does not apply to this one. */
3639 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3654 name
= ".gnu.version_d";
3657 name
= ".gnu.version_r";
3660 name
= ".gnu.version";
3662 o
= bfd_get_section_by_name (abfd
, name
);
3663 BFD_ASSERT (o
!= NULL
);
3664 dyn
.d_un
.d_ptr
= o
->vma
;
3665 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3672 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3677 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3679 Elf_Internal_Shdr
*hdr
;
3681 hdr
= elf_elfsections (abfd
)[i
];
3682 if (hdr
->sh_type
== type
3683 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3685 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3686 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3689 if (dyn
.d_un
.d_val
== 0
3690 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3691 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3695 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3701 /* If we have created any dynamic sections, then output them. */
3704 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3707 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3709 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3710 || o
->_raw_size
== 0)
3712 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3714 /* At this point, we are only interested in sections
3715 created by elf_link_create_dynamic_sections. */
3718 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
3720 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
3722 if (! bfd_set_section_contents (abfd
, o
->output_section
,
3723 o
->contents
, o
->output_offset
,
3731 /* The contents of the .dynstr section are actually in a
3733 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
3734 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
3735 || ! _bfd_stringtab_emit (abfd
,
3736 elf_hash_table (info
)->dynstr
))
3742 /* If we have optimized stabs strings, output them. */
3743 if (elf_hash_table (info
)->stab_info
!= NULL
)
3745 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
3749 if (finfo
.symstrtab
!= NULL
)
3750 _bfd_stringtab_free (finfo
.symstrtab
);
3751 if (finfo
.contents
!= NULL
)
3752 free (finfo
.contents
);
3753 if (finfo
.external_relocs
!= NULL
)
3754 free (finfo
.external_relocs
);
3755 if (finfo
.internal_relocs
!= NULL
)
3756 free (finfo
.internal_relocs
);
3757 if (finfo
.external_syms
!= NULL
)
3758 free (finfo
.external_syms
);
3759 if (finfo
.internal_syms
!= NULL
)
3760 free (finfo
.internal_syms
);
3761 if (finfo
.indices
!= NULL
)
3762 free (finfo
.indices
);
3763 if (finfo
.sections
!= NULL
)
3764 free (finfo
.sections
);
3765 if (finfo
.symbuf
!= NULL
)
3766 free (finfo
.symbuf
);
3767 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3769 if ((o
->flags
& SEC_RELOC
) != 0
3770 && elf_section_data (o
)->rel_hashes
!= NULL
)
3771 free (elf_section_data (o
)->rel_hashes
);
3774 elf_tdata (abfd
)->linker
= true;
3779 if (finfo
.symstrtab
!= NULL
)
3780 _bfd_stringtab_free (finfo
.symstrtab
);
3781 if (finfo
.contents
!= NULL
)
3782 free (finfo
.contents
);
3783 if (finfo
.external_relocs
!= NULL
)
3784 free (finfo
.external_relocs
);
3785 if (finfo
.internal_relocs
!= NULL
)
3786 free (finfo
.internal_relocs
);
3787 if (finfo
.external_syms
!= NULL
)
3788 free (finfo
.external_syms
);
3789 if (finfo
.internal_syms
!= NULL
)
3790 free (finfo
.internal_syms
);
3791 if (finfo
.indices
!= NULL
)
3792 free (finfo
.indices
);
3793 if (finfo
.sections
!= NULL
)
3794 free (finfo
.sections
);
3795 if (finfo
.symbuf
!= NULL
)
3796 free (finfo
.symbuf
);
3797 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3799 if ((o
->flags
& SEC_RELOC
) != 0
3800 && elf_section_data (o
)->rel_hashes
!= NULL
)
3801 free (elf_section_data (o
)->rel_hashes
);
3807 /* Add a symbol to the output symbol table. */
3810 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
3811 struct elf_final_link_info
*finfo
;
3813 Elf_Internal_Sym
*elfsym
;
3814 asection
*input_sec
;
3816 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
3817 struct bfd_link_info
*info
,
3822 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
3823 elf_backend_link_output_symbol_hook
;
3824 if (output_symbol_hook
!= NULL
)
3826 if (! ((*output_symbol_hook
)
3827 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
3831 if (name
== (const char *) NULL
|| *name
== '\0')
3832 elfsym
->st_name
= 0;
3835 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
3838 if (elfsym
->st_name
== (unsigned long) -1)
3842 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
3844 if (! elf_link_flush_output_syms (finfo
))
3848 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
3849 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
3850 ++finfo
->symbuf_count
;
3852 ++finfo
->output_bfd
->symcount
;
3857 /* Flush the output symbols to the file. */
3860 elf_link_flush_output_syms (finfo
)
3861 struct elf_final_link_info
*finfo
;
3863 if (finfo
->symbuf_count
> 0)
3865 Elf_Internal_Shdr
*symtab
;
3867 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
3869 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
3871 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
3872 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
3873 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
3876 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
3878 finfo
->symbuf_count
= 0;
3884 /* Add an external symbol to the symbol table. This is called from
3885 the hash table traversal routine. When generating a shared object,
3886 we go through the symbol table twice. The first time we output
3887 anything that might have been forced to local scope in a version
3888 script. The second time we output the symbols that are still
3892 elf_link_output_extsym (h
, data
)
3893 struct elf_link_hash_entry
*h
;
3896 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
3897 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
3899 Elf_Internal_Sym sym
;
3900 asection
*input_sec
;
3902 /* Decide whether to output this symbol in this pass. */
3903 if (eoinfo
->localsyms
)
3905 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3910 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
3914 /* If we are not creating a shared library, and this symbol is
3915 referenced by a shared library but is not defined anywhere, then
3916 warn that it is undefined. If we do not do this, the runtime
3917 linker will complain that the symbol is undefined when the
3918 program is run. We don't have to worry about symbols that are
3919 referenced by regular files, because we will already have issued
3920 warnings for them. */
3921 if (! finfo
->info
->relocateable
3922 && ! finfo
->info
->shared
3923 && h
->root
.type
== bfd_link_hash_undefined
3924 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
3925 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
3927 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
3928 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
3929 (asection
*) NULL
, 0)))
3931 eoinfo
->failed
= true;
3936 /* We don't want to output symbols that have never been mentioned by
3937 a regular file, or that we have been told to strip. However, if
3938 h->indx is set to -2, the symbol is used by a reloc and we must
3942 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3943 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
3944 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3945 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
3947 else if (finfo
->info
->strip
== strip_all
3948 || (finfo
->info
->strip
== strip_some
3949 && bfd_hash_lookup (finfo
->info
->keep_hash
,
3950 h
->root
.root
.string
,
3951 false, false) == NULL
))
3956 /* If we're stripping it, and it's not a dynamic symbol, there's
3957 nothing else to do. */
3958 if (strip
&& h
->dynindx
== -1)
3962 sym
.st_size
= h
->size
;
3963 sym
.st_other
= h
->other
;
3964 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
3965 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
3966 else if (h
->root
.type
== bfd_link_hash_undefweak
3967 || h
->root
.type
== bfd_link_hash_defweak
)
3968 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
3970 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
3972 switch (h
->root
.type
)
3975 case bfd_link_hash_new
:
3979 case bfd_link_hash_undefined
:
3980 input_sec
= bfd_und_section_ptr
;
3981 sym
.st_shndx
= SHN_UNDEF
;
3984 case bfd_link_hash_undefweak
:
3985 input_sec
= bfd_und_section_ptr
;
3986 sym
.st_shndx
= SHN_UNDEF
;
3989 case bfd_link_hash_defined
:
3990 case bfd_link_hash_defweak
:
3992 input_sec
= h
->root
.u
.def
.section
;
3993 if (input_sec
->output_section
!= NULL
)
3996 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
3997 input_sec
->output_section
);
3998 if (sym
.st_shndx
== (unsigned short) -1)
4000 eoinfo
->failed
= true;
4004 /* ELF symbols in relocateable files are section relative,
4005 but in nonrelocateable files they are virtual
4007 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4008 if (! finfo
->info
->relocateable
)
4009 sym
.st_value
+= input_sec
->output_section
->vma
;
4013 BFD_ASSERT (input_sec
->owner
== NULL
4014 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4015 sym
.st_shndx
= SHN_UNDEF
;
4016 input_sec
= bfd_und_section_ptr
;
4021 case bfd_link_hash_common
:
4022 input_sec
= bfd_com_section_ptr
;
4023 sym
.st_shndx
= SHN_COMMON
;
4024 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4027 case bfd_link_hash_indirect
:
4028 /* These symbols are created by symbol versioning. They point
4029 to the decorated version of the name. For example, if the
4030 symbol foo@@GNU_1.2 is the default, which should be used when
4031 foo is used with no version, then we add an indirect symbol
4032 foo which points to foo@@GNU_1.2. We ignore these symbols,
4033 since the indirected symbol is already in the hash table. If
4034 the indirect symbol is non-ELF, fall through and output it. */
4035 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4039 case bfd_link_hash_warning
:
4040 /* We can't represent these symbols in ELF, although a warning
4041 symbol may have come from a .gnu.warning.SYMBOL section. We
4042 just put the target symbol in the hash table. If the target
4043 symbol does not really exist, don't do anything. */
4044 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4046 return (elf_link_output_extsym
4047 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4050 /* If this symbol should be put in the .dynsym section, then put it
4051 there now. We have already know the symbol index. We also fill
4052 in the entry in the .hash section. */
4053 if (h
->dynindx
!= -1
4054 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4056 struct elf_backend_data
*bed
;
4061 bfd_byte
*bucketpos
;
4064 sym
.st_name
= h
->dynstr_index
;
4066 /* Give the processor backend a chance to tweak the symbol
4067 value, and also to finish up anything that needs to be done
4069 bed
= get_elf_backend_data (finfo
->output_bfd
);
4070 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4071 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4073 eoinfo
->failed
= true;
4077 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4078 (PTR
) (((Elf_External_Sym
*)
4079 finfo
->dynsym_sec
->contents
)
4082 /* We didn't include the version string in the dynamic string
4083 table, so we must not consider it in the hash table. */
4084 name
= h
->root
.root
.string
;
4085 p
= strchr (name
, ELF_VER_CHR
);
4090 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4091 strncpy (copy
, name
, p
- name
);
4092 copy
[p
- name
] = '\0';
4096 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4097 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4098 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4099 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4100 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4101 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4102 put_word (finfo
->output_bfd
, chain
,
4103 ((bfd_byte
*) finfo
->hash_sec
->contents
4104 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4107 bfd_release (finfo
->output_bfd
, copy
);
4109 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4111 Elf_Internal_Versym iversym
;
4113 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4115 if (h
->verinfo
.verdef
== NULL
)
4116 iversym
.vs_vers
= 0;
4118 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4122 if (h
->verinfo
.vertree
== NULL
)
4123 iversym
.vs_vers
= 1;
4125 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4128 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4129 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4131 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4132 (((Elf_External_Versym
*)
4133 finfo
->symver_sec
->contents
)
4138 /* If we're stripping it, then it was just a dynamic symbol, and
4139 there's nothing else to do. */
4143 h
->indx
= finfo
->output_bfd
->symcount
;
4145 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4147 eoinfo
->failed
= true;
4154 /* Link an input file into the linker output file. This function
4155 handles all the sections and relocations of the input file at once.
4156 This is so that we only have to read the local symbols once, and
4157 don't have to keep them in memory. */
4160 elf_link_input_bfd (finfo
, input_bfd
)
4161 struct elf_final_link_info
*finfo
;
4164 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4165 bfd
*, asection
*, bfd_byte
*,
4166 Elf_Internal_Rela
*,
4167 Elf_Internal_Sym
*, asection
**));
4169 Elf_Internal_Shdr
*symtab_hdr
;
4172 Elf_External_Sym
*external_syms
;
4173 Elf_External_Sym
*esym
;
4174 Elf_External_Sym
*esymend
;
4175 Elf_Internal_Sym
*isym
;
4177 asection
**ppsection
;
4180 output_bfd
= finfo
->output_bfd
;
4182 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4184 /* If this is a dynamic object, we don't want to do anything here:
4185 we don't want the local symbols, and we don't want the section
4187 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4190 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4191 if (elf_bad_symtab (input_bfd
))
4193 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4198 locsymcount
= symtab_hdr
->sh_info
;
4199 extsymoff
= symtab_hdr
->sh_info
;
4202 /* Read the local symbols. */
4203 if (symtab_hdr
->contents
!= NULL
)
4204 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4205 else if (locsymcount
== 0)
4206 external_syms
= NULL
;
4209 external_syms
= finfo
->external_syms
;
4210 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4211 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4212 locsymcount
, input_bfd
)
4213 != locsymcount
* sizeof (Elf_External_Sym
)))
4217 /* Swap in the local symbols and write out the ones which we know
4218 are going into the output file. */
4219 esym
= external_syms
;
4220 esymend
= esym
+ locsymcount
;
4221 isym
= finfo
->internal_syms
;
4222 pindex
= finfo
->indices
;
4223 ppsection
= finfo
->sections
;
4224 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4228 Elf_Internal_Sym osym
;
4230 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4233 if (elf_bad_symtab (input_bfd
))
4235 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4242 if (isym
->st_shndx
== SHN_UNDEF
)
4243 isec
= bfd_und_section_ptr
;
4244 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4245 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4246 else if (isym
->st_shndx
== SHN_ABS
)
4247 isec
= bfd_abs_section_ptr
;
4248 else if (isym
->st_shndx
== SHN_COMMON
)
4249 isec
= bfd_com_section_ptr
;
4258 /* Don't output the first, undefined, symbol. */
4259 if (esym
== external_syms
)
4262 /* If we are stripping all symbols, we don't want to output this
4264 if (finfo
->info
->strip
== strip_all
)
4267 /* We never output section symbols. Instead, we use the section
4268 symbol of the corresponding section in the output file. */
4269 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4272 /* If we are discarding all local symbols, we don't want to
4273 output this one. If we are generating a relocateable output
4274 file, then some of the local symbols may be required by
4275 relocs; we output them below as we discover that they are
4277 if (finfo
->info
->discard
== discard_all
)
4280 /* If this symbol is defined in a section which we are
4281 discarding, we don't need to keep it, but note that
4282 linker_mark is only reliable for sections that have contents.
4283 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4284 as well as linker_mark. */
4285 if (isym
->st_shndx
> 0
4286 && isym
->st_shndx
< SHN_LORESERVE
4288 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4289 || (! finfo
->info
->relocateable
4290 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4293 /* Get the name of the symbol. */
4294 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4299 /* See if we are discarding symbols with this name. */
4300 if ((finfo
->info
->strip
== strip_some
4301 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4303 || (finfo
->info
->discard
== discard_l
4304 && bfd_is_local_label_name (input_bfd
, name
)))
4307 /* If we get here, we are going to output this symbol. */
4311 /* Adjust the section index for the output file. */
4312 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4313 isec
->output_section
);
4314 if (osym
.st_shndx
== (unsigned short) -1)
4317 *pindex
= output_bfd
->symcount
;
4319 /* ELF symbols in relocateable files are section relative, but
4320 in executable files they are virtual addresses. Note that
4321 this code assumes that all ELF sections have an associated
4322 BFD section with a reasonable value for output_offset; below
4323 we assume that they also have a reasonable value for
4324 output_section. Any special sections must be set up to meet
4325 these requirements. */
4326 osym
.st_value
+= isec
->output_offset
;
4327 if (! finfo
->info
->relocateable
)
4328 osym
.st_value
+= isec
->output_section
->vma
;
4330 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4334 /* Relocate the contents of each section. */
4335 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4339 if (! o
->linker_mark
)
4341 /* This section was omitted from the link. */
4345 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4346 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4349 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4351 /* Section was created by elf_link_create_dynamic_sections
4356 /* Get the contents of the section. They have been cached by a
4357 relaxation routine. Note that o is a section in an input
4358 file, so the contents field will not have been set by any of
4359 the routines which work on output files. */
4360 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4361 contents
= elf_section_data (o
)->this_hdr
.contents
;
4364 contents
= finfo
->contents
;
4365 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4366 (file_ptr
) 0, o
->_raw_size
))
4370 if ((o
->flags
& SEC_RELOC
) != 0)
4372 Elf_Internal_Rela
*internal_relocs
;
4374 /* Get the swapped relocs. */
4375 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4376 (input_bfd
, o
, finfo
->external_relocs
,
4377 finfo
->internal_relocs
, false));
4378 if (internal_relocs
== NULL
4379 && o
->reloc_count
> 0)
4382 /* Relocate the section by invoking a back end routine.
4384 The back end routine is responsible for adjusting the
4385 section contents as necessary, and (if using Rela relocs
4386 and generating a relocateable output file) adjusting the
4387 reloc addend as necessary.
4389 The back end routine does not have to worry about setting
4390 the reloc address or the reloc symbol index.
4392 The back end routine is given a pointer to the swapped in
4393 internal symbols, and can access the hash table entries
4394 for the external symbols via elf_sym_hashes (input_bfd).
4396 When generating relocateable output, the back end routine
4397 must handle STB_LOCAL/STT_SECTION symbols specially. The
4398 output symbol is going to be a section symbol
4399 corresponding to the output section, which will require
4400 the addend to be adjusted. */
4402 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4403 input_bfd
, o
, contents
,
4405 finfo
->internal_syms
,
4409 if (finfo
->info
->relocateable
)
4411 Elf_Internal_Rela
*irela
;
4412 Elf_Internal_Rela
*irelaend
;
4413 struct elf_link_hash_entry
**rel_hash
;
4414 Elf_Internal_Shdr
*input_rel_hdr
;
4415 Elf_Internal_Shdr
*output_rel_hdr
;
4417 /* Adjust the reloc addresses and symbol indices. */
4419 irela
= internal_relocs
;
4420 irelaend
= irela
+ o
->reloc_count
;
4421 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4422 + o
->output_section
->reloc_count
);
4423 for (; irela
< irelaend
; irela
++, rel_hash
++)
4425 unsigned long r_symndx
;
4426 Elf_Internal_Sym
*isym
;
4429 irela
->r_offset
+= o
->output_offset
;
4431 r_symndx
= ELF_R_SYM (irela
->r_info
);
4436 if (r_symndx
>= locsymcount
4437 || (elf_bad_symtab (input_bfd
)
4438 && finfo
->sections
[r_symndx
] == NULL
))
4442 /* This is a reloc against a global symbol. We
4443 have not yet output all the local symbols, so
4444 we do not know the symbol index of any global
4445 symbol. We set the rel_hash entry for this
4446 reloc to point to the global hash table entry
4447 for this symbol. The symbol index is then
4448 set at the end of elf_bfd_final_link. */
4449 indx
= r_symndx
- extsymoff
;
4450 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4452 /* Setting the index to -2 tells
4453 elf_link_output_extsym that this symbol is
4455 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4456 (*rel_hash
)->indx
= -2;
4461 /* This is a reloc against a local symbol. */
4464 isym
= finfo
->internal_syms
+ r_symndx
;
4465 sec
= finfo
->sections
[r_symndx
];
4466 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4468 /* I suppose the backend ought to fill in the
4469 section of any STT_SECTION symbol against a
4470 processor specific section. If we have
4471 discarded a section, the output_section will
4472 be the absolute section. */
4474 && (bfd_is_abs_section (sec
)
4475 || (sec
->output_section
!= NULL
4476 && bfd_is_abs_section (sec
->output_section
))))
4478 else if (sec
== NULL
|| sec
->owner
== NULL
)
4480 bfd_set_error (bfd_error_bad_value
);
4485 r_symndx
= sec
->output_section
->target_index
;
4486 BFD_ASSERT (r_symndx
!= 0);
4491 if (finfo
->indices
[r_symndx
] == -1)
4497 if (finfo
->info
->strip
== strip_all
)
4499 /* You can't do ld -r -s. */
4500 bfd_set_error (bfd_error_invalid_operation
);
4504 /* This symbol was skipped earlier, but
4505 since it is needed by a reloc, we
4506 must output it now. */
4507 link
= symtab_hdr
->sh_link
;
4508 name
= bfd_elf_string_from_elf_section (input_bfd
,
4514 osec
= sec
->output_section
;
4516 _bfd_elf_section_from_bfd_section (output_bfd
,
4518 if (isym
->st_shndx
== (unsigned short) -1)
4521 isym
->st_value
+= sec
->output_offset
;
4522 if (! finfo
->info
->relocateable
)
4523 isym
->st_value
+= osec
->vma
;
4525 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4527 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4531 r_symndx
= finfo
->indices
[r_symndx
];
4534 irela
->r_info
= ELF_R_INFO (r_symndx
,
4535 ELF_R_TYPE (irela
->r_info
));
4538 /* Swap out the relocs. */
4539 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4540 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4541 BFD_ASSERT (output_rel_hdr
->sh_entsize
4542 == input_rel_hdr
->sh_entsize
);
4543 irela
= internal_relocs
;
4544 irelaend
= irela
+ o
->reloc_count
;
4545 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4547 Elf_External_Rel
*erel
;
4549 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4550 + o
->output_section
->reloc_count
);
4551 for (; irela
< irelaend
; irela
++, erel
++)
4553 Elf_Internal_Rel irel
;
4555 irel
.r_offset
= irela
->r_offset
;
4556 irel
.r_info
= irela
->r_info
;
4557 BFD_ASSERT (irela
->r_addend
== 0);
4558 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4563 Elf_External_Rela
*erela
;
4565 BFD_ASSERT (input_rel_hdr
->sh_entsize
4566 == sizeof (Elf_External_Rela
));
4567 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4568 + o
->output_section
->reloc_count
);
4569 for (; irela
< irelaend
; irela
++, erela
++)
4570 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4573 o
->output_section
->reloc_count
+= o
->reloc_count
;
4577 /* Write out the modified section contents. */
4578 if (elf_section_data (o
)->stab_info
== NULL
)
4580 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4581 contents
, o
->output_offset
,
4582 (o
->_cooked_size
!= 0
4589 if (! (_bfd_write_section_stabs
4590 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4591 o
, &elf_section_data (o
)->stab_info
, contents
)))
4599 /* Generate a reloc when linking an ELF file. This is a reloc
4600 requested by the linker, and does come from any input file. This
4601 is used to build constructor and destructor tables when linking
4605 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4607 struct bfd_link_info
*info
;
4608 asection
*output_section
;
4609 struct bfd_link_order
*link_order
;
4611 reloc_howto_type
*howto
;
4615 struct elf_link_hash_entry
**rel_hash_ptr
;
4616 Elf_Internal_Shdr
*rel_hdr
;
4618 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4621 bfd_set_error (bfd_error_bad_value
);
4625 addend
= link_order
->u
.reloc
.p
->addend
;
4627 /* Figure out the symbol index. */
4628 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4629 + output_section
->reloc_count
);
4630 if (link_order
->type
== bfd_section_reloc_link_order
)
4632 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4633 BFD_ASSERT (indx
!= 0);
4634 *rel_hash_ptr
= NULL
;
4638 struct elf_link_hash_entry
*h
;
4640 /* Treat a reloc against a defined symbol as though it were
4641 actually against the section. */
4642 h
= ((struct elf_link_hash_entry
*)
4643 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4644 link_order
->u
.reloc
.p
->u
.name
,
4645 false, false, true));
4647 && (h
->root
.type
== bfd_link_hash_defined
4648 || h
->root
.type
== bfd_link_hash_defweak
))
4652 section
= h
->root
.u
.def
.section
;
4653 indx
= section
->output_section
->target_index
;
4654 *rel_hash_ptr
= NULL
;
4655 /* It seems that we ought to add the symbol value to the
4656 addend here, but in practice it has already been added
4657 because it was passed to constructor_callback. */
4658 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4662 /* Setting the index to -2 tells elf_link_output_extsym that
4663 this symbol is used by a reloc. */
4670 if (! ((*info
->callbacks
->unattached_reloc
)
4671 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4672 (asection
*) NULL
, (bfd_vma
) 0)))
4678 /* If this is an inplace reloc, we must write the addend into the
4680 if (howto
->partial_inplace
&& addend
!= 0)
4683 bfd_reloc_status_type rstat
;
4687 size
= bfd_get_reloc_size (howto
);
4688 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4689 if (buf
== (bfd_byte
*) NULL
)
4691 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4697 case bfd_reloc_outofrange
:
4699 case bfd_reloc_overflow
:
4700 if (! ((*info
->callbacks
->reloc_overflow
)
4702 (link_order
->type
== bfd_section_reloc_link_order
4703 ? bfd_section_name (output_bfd
,
4704 link_order
->u
.reloc
.p
->u
.section
)
4705 : link_order
->u
.reloc
.p
->u
.name
),
4706 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
4714 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
4715 (file_ptr
) link_order
->offset
, size
);
4721 /* The address of a reloc is relative to the section in a
4722 relocateable file, and is a virtual address in an executable
4724 offset
= link_order
->offset
;
4725 if (! info
->relocateable
)
4726 offset
+= output_section
->vma
;
4728 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4730 if (rel_hdr
->sh_type
== SHT_REL
)
4732 Elf_Internal_Rel irel
;
4733 Elf_External_Rel
*erel
;
4735 irel
.r_offset
= offset
;
4736 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4737 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
4738 + output_section
->reloc_count
);
4739 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4743 Elf_Internal_Rela irela
;
4744 Elf_External_Rela
*erela
;
4746 irela
.r_offset
= offset
;
4747 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4748 irela
.r_addend
= addend
;
4749 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
4750 + output_section
->reloc_count
);
4751 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
4754 ++output_section
->reloc_count
;
4760 /* Allocate a pointer to live in a linker created section. */
4763 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
4765 struct bfd_link_info
*info
;
4766 elf_linker_section_t
*lsect
;
4767 struct elf_link_hash_entry
*h
;
4768 const Elf_Internal_Rela
*rel
;
4770 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
4771 elf_linker_section_pointers_t
*linker_section_ptr
;
4772 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
4774 BFD_ASSERT (lsect
!= NULL
);
4776 /* Is this a global symbol? */
4779 /* Has this symbol already been allocated, if so, our work is done */
4780 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
4785 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
4786 /* Make sure this symbol is output as a dynamic symbol. */
4787 if (h
->dynindx
== -1)
4789 if (! elf_link_record_dynamic_symbol (info
, h
))
4793 if (lsect
->rel_section
)
4794 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
4797 else /* Allocation of a pointer to a local symbol */
4799 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
4801 /* Allocate a table to hold the local symbols if first time */
4804 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
4805 register unsigned int i
;
4807 ptr
= (elf_linker_section_pointers_t
**)
4808 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
4813 elf_local_ptr_offsets (abfd
) = ptr
;
4814 for (i
= 0; i
< num_symbols
; i
++)
4815 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
4818 /* Has this symbol already been allocated, if so, our work is done */
4819 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
4824 ptr_linker_section_ptr
= &ptr
[r_symndx
];
4828 /* If we are generating a shared object, we need to
4829 output a R_<xxx>_RELATIVE reloc so that the
4830 dynamic linker can adjust this GOT entry. */
4831 BFD_ASSERT (lsect
->rel_section
!= NULL
);
4832 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
4836 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
4837 from internal memory. */
4838 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
4839 linker_section_ptr
= (elf_linker_section_pointers_t
*)
4840 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
4842 if (!linker_section_ptr
)
4845 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
4846 linker_section_ptr
->addend
= rel
->r_addend
;
4847 linker_section_ptr
->which
= lsect
->which
;
4848 linker_section_ptr
->written_address_p
= false;
4849 *ptr_linker_section_ptr
= linker_section_ptr
;
4852 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
4854 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
4855 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
4856 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
4857 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
4859 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
4861 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
4862 lsect
->sym_hash
->root
.root
.string
,
4863 (long)ARCH_SIZE
/ 8,
4864 (long)lsect
->sym_hash
->root
.u
.def
.value
);
4870 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
4872 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
4875 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
4876 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
4884 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
4887 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
4890 /* Fill in the address for a pointer generated in alinker section. */
4893 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
4896 struct bfd_link_info
*info
;
4897 elf_linker_section_t
*lsect
;
4898 struct elf_link_hash_entry
*h
;
4900 const Elf_Internal_Rela
*rel
;
4903 elf_linker_section_pointers_t
*linker_section_ptr
;
4905 BFD_ASSERT (lsect
!= NULL
);
4907 if (h
!= NULL
) /* global symbol */
4909 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
4913 BFD_ASSERT (linker_section_ptr
!= NULL
);
4915 if (! elf_hash_table (info
)->dynamic_sections_created
4918 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
4920 /* This is actually a static link, or it is a
4921 -Bsymbolic link and the symbol is defined
4922 locally. We must initialize this entry in the
4925 When doing a dynamic link, we create a .rela.<xxx>
4926 relocation entry to initialize the value. This
4927 is done in the finish_dynamic_symbol routine. */
4928 if (!linker_section_ptr
->written_address_p
)
4930 linker_section_ptr
->written_address_p
= true;
4931 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
4932 lsect
->section
->contents
+ linker_section_ptr
->offset
);
4936 else /* local symbol */
4938 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
4939 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
4940 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
4941 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
4945 BFD_ASSERT (linker_section_ptr
!= NULL
);
4947 /* Write out pointer if it hasn't been rewritten out before */
4948 if (!linker_section_ptr
->written_address_p
)
4950 linker_section_ptr
->written_address_p
= true;
4951 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
4952 lsect
->section
->contents
+ linker_section_ptr
->offset
);
4956 asection
*srel
= lsect
->rel_section
;
4957 Elf_Internal_Rela outrel
;
4959 /* We need to generate a relative reloc for the dynamic linker. */
4961 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
4964 BFD_ASSERT (srel
!= NULL
);
4966 outrel
.r_offset
= (lsect
->section
->output_section
->vma
4967 + lsect
->section
->output_offset
4968 + linker_section_ptr
->offset
);
4969 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
4970 outrel
.r_addend
= 0;
4971 elf_swap_reloca_out (output_bfd
, &outrel
,
4972 (((Elf_External_Rela
*)
4973 lsect
->section
->contents
)
4974 + lsect
->section
->reloc_count
));
4975 ++lsect
->section
->reloc_count
;
4980 relocation
= (lsect
->section
->output_offset
4981 + linker_section_ptr
->offset
4982 - lsect
->hole_offset
4983 - lsect
->sym_offset
);
4986 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
4987 lsect
->name
, (long)relocation
, (long)relocation
);
4990 /* Subtract out the addend, because it will get added back in by the normal
4992 return relocation
- linker_section_ptr
->addend
;