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
);
738 sec
= bfd_abs_section_ptr
;
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
;
1037 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1038 && (definition
|| h
->type
== STT_NOTYPE
))
1040 if (h
->type
!= STT_NOTYPE
1041 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1042 && ! type_change_ok
)
1043 (*_bfd_error_handler
)
1044 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1045 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1046 bfd_get_filename (abfd
));
1048 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1051 if (sym
.st_other
!= 0
1052 && (definition
|| h
->other
== 0))
1053 h
->other
= sym
.st_other
;
1055 /* Set a flag in the hash table entry indicating the type of
1056 reference or definition we just found. Keep a count of
1057 the number of dynamic symbols we find. A dynamic symbol
1058 is one which is referenced or defined by both a regular
1059 object and a shared object. */
1060 old_flags
= h
->elf_link_hash_flags
;
1065 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1067 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1069 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1070 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1076 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1078 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1079 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1080 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1081 || (h
->weakdef
!= NULL
1083 && h
->weakdef
->dynindx
!= -1))
1087 h
->elf_link_hash_flags
|= new_flag
;
1089 /* If this symbol has a version, and it is the default
1090 version, we create an indirect symbol from the default
1091 name to the fully decorated name. This will cause
1092 external references which do not specify a version to be
1093 bound to this version of the symbol. */
1098 p
= strchr (name
, ELF_VER_CHR
);
1099 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1102 struct elf_link_hash_entry
*hold
;
1104 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1106 if (shortname
== NULL
)
1108 strncpy (shortname
, name
, p
- name
);
1109 shortname
[p
- name
] = '\0';
1111 /* First look to see if we have an existing symbol
1113 hold
= elf_link_hash_lookup (elf_hash_table (info
),
1114 shortname
, false, false,
1117 /* If we are looking at a normal object, and the
1118 symbol was seen in a shared object, clobber the
1119 definition in the shared object. */
1122 && (hold
->root
.type
== bfd_link_hash_defined
1123 || hold
->root
.type
== bfd_link_hash_defweak
)
1124 && (hold
->elf_link_hash_flags
1125 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1126 && ((hold
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
)
1129 /* Change the hash table entry to undefined, so
1130 that _bfd_generic_link_add_one_symbol will do
1132 hold
->root
.type
= bfd_link_hash_undefined
;
1133 hold
->root
.u
.undef
.abfd
=
1134 hold
->root
.u
.def
.section
->owner
;
1135 hold
->verinfo
.vertree
= NULL
;
1139 /* If we are looking at a shared object, and we have
1140 already seen this symbol defined elsewhere, then
1141 don't try to define it again. */
1144 && (hold
->root
.type
== bfd_link_hash_defined
1145 || hold
->root
.type
== bfd_link_hash_defweak
1146 || hold
->root
.type
== bfd_link_hash_indirect
1147 || (hold
->root
.type
== bfd_link_hash_common
1148 && (bind
== STB_WEAK
1149 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
))))
1151 /* Don't add an indirect symbol. */
1155 struct elf_link_hash_entry
*hi
;
1158 if (! (_bfd_generic_link_add_one_symbol
1159 (info
, abfd
, shortname
, BSF_INDIRECT
,
1160 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1161 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1164 /* If there is a duplicate definition somewhere,
1165 then HI may not point to an indirect symbol.
1166 We will have reported an error to the user in
1169 if (hi
->root
.type
== bfd_link_hash_indirect
)
1171 hi
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
1173 /* If the symbol became indirect, then we
1174 assume that we have not seen a definition
1176 BFD_ASSERT ((hi
->elf_link_hash_flags
1177 & (ELF_LINK_HASH_DEF_DYNAMIC
1178 | ELF_LINK_HASH_DEF_REGULAR
))
1181 /* Copy down any references that we may have
1182 already seen to the symbol which just
1184 h
->elf_link_hash_flags
|=
1185 (hi
->elf_link_hash_flags
1186 & (ELF_LINK_HASH_REF_DYNAMIC
1187 | ELF_LINK_HASH_REF_REGULAR
));
1189 /* Copy over the global table offset entry.
1190 This may have been already set up by a
1191 check_relocs routine. */
1192 if (h
->got_offset
== (bfd_vma
) -1)
1194 h
->got_offset
= hi
->got_offset
;
1195 hi
->got_offset
= (bfd_vma
) -1;
1197 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1199 if (h
->dynindx
== -1)
1201 h
->dynindx
= hi
->dynindx
;
1202 h
->dynstr_index
= hi
->dynstr_index
;
1204 hi
->dynstr_index
= 0;
1206 BFD_ASSERT (hi
->dynindx
== -1);
1208 /* FIXME: There may be other information to
1209 copy over for particular targets. */
1211 /* See if the new flags lead us to realize
1212 that the symbol must be dynamic. */
1218 || ((hi
->elf_link_hash_flags
1219 & ELF_LINK_HASH_REF_DYNAMIC
)
1225 if ((hi
->elf_link_hash_flags
1226 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1233 /* We also need to define an indirection from the
1234 nondefault version of the symbol. */
1236 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1238 if (shortname
== NULL
)
1240 strncpy (shortname
, name
, p
- name
);
1241 strcpy (shortname
+ (p
- name
), p
+ 1);
1243 /* First look to see if we have an existing symbol
1245 hold
= elf_link_hash_lookup (elf_hash_table (info
),
1246 shortname
, false, false,
1249 /* If we are looking at a normal object, and the
1250 symbol was seen in a shared object, clobber the
1251 definition in the shared object. */
1254 && (hold
->root
.type
== bfd_link_hash_defined
1255 || hold
->root
.type
== bfd_link_hash_defweak
)
1256 && (hold
->elf_link_hash_flags
1257 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1258 && ((hold
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
)
1261 /* Change the hash table entry to undefined, so
1262 that _bfd_generic_link_add_one_symbol will do
1264 hold
->root
.type
= bfd_link_hash_undefined
;
1265 hold
->root
.u
.undef
.abfd
=
1266 hold
->root
.u
.def
.section
->owner
;
1267 hold
->verinfo
.vertree
= NULL
;
1271 /* If we are looking at a shared object, and we have
1272 already seen this symbol defined elsewhere, then
1273 don't try to define it again. */
1276 && (hold
->root
.type
== bfd_link_hash_defined
1277 || hold
->root
.type
== bfd_link_hash_defweak
1278 || hold
->root
.type
== bfd_link_hash_indirect
1279 || (hold
->root
.type
== bfd_link_hash_common
1280 && (bind
== STB_WEAK
1281 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
))))
1283 /* Don't add an indirect symbol. */
1287 struct elf_link_hash_entry
*hi
;
1290 if (! (_bfd_generic_link_add_one_symbol
1291 (info
, abfd
, shortname
, BSF_INDIRECT
,
1292 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1293 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1296 /* If there is a duplicate definition somewhere,
1297 then HI may not point to an indirect symbol.
1298 We will have reported an error to the user in
1301 if (hi
->root
.type
== bfd_link_hash_indirect
)
1303 hi
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
1305 /* If the symbol became indirect, then we
1306 assume that we have not seen a definition
1308 BFD_ASSERT ((hi
->elf_link_hash_flags
1309 & (ELF_LINK_HASH_DEF_DYNAMIC
1310 | ELF_LINK_HASH_DEF_REGULAR
))
1313 /* Copy down any references that we may have
1314 already seen to the symbol which just
1316 h
->elf_link_hash_flags
|=
1317 (hi
->elf_link_hash_flags
1318 & (ELF_LINK_HASH_REF_DYNAMIC
1319 | ELF_LINK_HASH_REF_REGULAR
));
1321 /* Copy over the global table offset entry.
1322 This may have been already set up by a
1323 check_relocs routine. */
1324 if (h
->got_offset
== (bfd_vma
) -1)
1326 h
->got_offset
= hi
->got_offset
;
1327 hi
->got_offset
= (bfd_vma
) -1;
1329 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1331 if (h
->dynindx
== -1)
1333 h
->dynindx
= hi
->dynindx
;
1334 h
->dynstr_index
= hi
->dynstr_index
;
1336 hi
->dynstr_index
= 0;
1338 BFD_ASSERT (hi
->dynindx
== -1);
1340 /* FIXME: There may be other information to
1341 copy over for particular targets. */
1343 /* See if the new flags lead us to realize
1344 that the symbol must be dynamic. */
1350 || ((hi
->elf_link_hash_flags
1351 & ELF_LINK_HASH_REF_DYNAMIC
)
1357 if ((hi
->elf_link_hash_flags
1358 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1367 if (dynsym
&& h
->dynindx
== -1)
1369 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1371 if (h
->weakdef
!= NULL
1373 && h
->weakdef
->dynindx
== -1)
1375 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1383 /* Now set the weakdefs field correctly for all the weak defined
1384 symbols we found. The only way to do this is to search all the
1385 symbols. Since we only need the information for non functions in
1386 dynamic objects, that's the only time we actually put anything on
1387 the list WEAKS. We need this information so that if a regular
1388 object refers to a symbol defined weakly in a dynamic object, the
1389 real symbol in the dynamic object is also put in the dynamic
1390 symbols; we also must arrange for both symbols to point to the
1391 same memory location. We could handle the general case of symbol
1392 aliasing, but a general symbol alias can only be generated in
1393 assembler code, handling it correctly would be very time
1394 consuming, and other ELF linkers don't handle general aliasing
1396 while (weaks
!= NULL
)
1398 struct elf_link_hash_entry
*hlook
;
1401 struct elf_link_hash_entry
**hpp
;
1402 struct elf_link_hash_entry
**hppend
;
1405 weaks
= hlook
->weakdef
;
1406 hlook
->weakdef
= NULL
;
1408 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1409 || hlook
->root
.type
== bfd_link_hash_defweak
1410 || hlook
->root
.type
== bfd_link_hash_common
1411 || hlook
->root
.type
== bfd_link_hash_indirect
);
1412 slook
= hlook
->root
.u
.def
.section
;
1413 vlook
= hlook
->root
.u
.def
.value
;
1415 hpp
= elf_sym_hashes (abfd
);
1416 hppend
= hpp
+ extsymcount
;
1417 for (; hpp
< hppend
; hpp
++)
1419 struct elf_link_hash_entry
*h
;
1422 if (h
!= NULL
&& h
!= hlook
1423 && h
->root
.type
== bfd_link_hash_defined
1424 && h
->root
.u
.def
.section
== slook
1425 && h
->root
.u
.def
.value
== vlook
)
1429 /* If the weak definition is in the list of dynamic
1430 symbols, make sure the real definition is put there
1432 if (hlook
->dynindx
!= -1
1433 && h
->dynindx
== -1)
1435 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1439 /* If the real definition is in the list of dynamic
1440 symbols, make sure the weak definition is put there
1441 as well. If we don't do this, then the dynamic
1442 loader might not merge the entries for the real
1443 definition and the weak definition. */
1444 if (h
->dynindx
!= -1
1445 && hlook
->dynindx
== -1)
1447 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1462 if (extversym
!= NULL
)
1468 /* If this object is the same format as the output object, and it is
1469 not a shared library, then let the backend look through the
1472 This is required to build global offset table entries and to
1473 arrange for dynamic relocs. It is not required for the
1474 particular common case of linking non PIC code, even when linking
1475 against shared libraries, but unfortunately there is no way of
1476 knowing whether an object file has been compiled PIC or not.
1477 Looking through the relocs is not particularly time consuming.
1478 The problem is that we must either (1) keep the relocs in memory,
1479 which causes the linker to require additional runtime memory or
1480 (2) read the relocs twice from the input file, which wastes time.
1481 This would be a good case for using mmap.
1483 I have no idea how to handle linking PIC code into a file of a
1484 different format. It probably can't be done. */
1485 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1487 && abfd
->xvec
== info
->hash
->creator
1488 && check_relocs
!= NULL
)
1492 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1494 Elf_Internal_Rela
*internal_relocs
;
1497 if ((o
->flags
& SEC_RELOC
) == 0
1498 || o
->reloc_count
== 0
1499 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1500 && (o
->flags
& SEC_DEBUGGING
) != 0))
1503 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1504 (abfd
, o
, (PTR
) NULL
,
1505 (Elf_Internal_Rela
*) NULL
,
1506 info
->keep_memory
));
1507 if (internal_relocs
== NULL
)
1510 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1512 if (! info
->keep_memory
)
1513 free (internal_relocs
);
1520 /* If this is a non-traditional, non-relocateable link, try to
1521 optimize the handling of the .stab/.stabstr sections. */
1523 && ! info
->relocateable
1524 && ! info
->traditional_format
1525 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1526 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1528 asection
*stab
, *stabstr
;
1530 stab
= bfd_get_section_by_name (abfd
, ".stab");
1533 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1535 if (stabstr
!= NULL
)
1537 struct bfd_elf_section_data
*secdata
;
1539 secdata
= elf_section_data (stab
);
1540 if (! _bfd_link_section_stabs (abfd
,
1541 &elf_hash_table (info
)->stab_info
,
1543 &secdata
->stab_info
))
1558 if (extversym
!= NULL
)
1563 /* Create some sections which will be filled in with dynamic linking
1564 information. ABFD is an input file which requires dynamic sections
1565 to be created. The dynamic sections take up virtual memory space
1566 when the final executable is run, so we need to create them before
1567 addresses are assigned to the output sections. We work out the
1568 actual contents and size of these sections later. */
1571 elf_link_create_dynamic_sections (abfd
, info
)
1573 struct bfd_link_info
*info
;
1576 register asection
*s
;
1577 struct elf_link_hash_entry
*h
;
1578 struct elf_backend_data
*bed
;
1580 if (elf_hash_table (info
)->dynamic_sections_created
)
1583 /* Make sure that all dynamic sections use the same input BFD. */
1584 if (elf_hash_table (info
)->dynobj
== NULL
)
1585 elf_hash_table (info
)->dynobj
= abfd
;
1587 abfd
= elf_hash_table (info
)->dynobj
;
1589 /* Note that we set the SEC_IN_MEMORY flag for all of these
1591 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1592 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1594 /* A dynamically linked executable has a .interp section, but a
1595 shared library does not. */
1598 s
= bfd_make_section (abfd
, ".interp");
1600 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1604 /* Create sections to hold version informations. These are removed
1605 if they are not needed. */
1606 s
= bfd_make_section (abfd
, ".gnu.version_d");
1608 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1609 || ! bfd_set_section_alignment (abfd
, s
, 2))
1612 s
= bfd_make_section (abfd
, ".gnu.version");
1614 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1615 || ! bfd_set_section_alignment (abfd
, s
, 1))
1618 s
= bfd_make_section (abfd
, ".gnu.version_r");
1620 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1621 || ! bfd_set_section_alignment (abfd
, s
, 2))
1624 s
= bfd_make_section (abfd
, ".dynsym");
1626 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1627 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1630 s
= bfd_make_section (abfd
, ".dynstr");
1632 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1635 /* Create a strtab to hold the dynamic symbol names. */
1636 if (elf_hash_table (info
)->dynstr
== NULL
)
1638 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1639 if (elf_hash_table (info
)->dynstr
== NULL
)
1643 s
= bfd_make_section (abfd
, ".dynamic");
1645 || ! bfd_set_section_flags (abfd
, s
, flags
)
1646 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1649 /* The special symbol _DYNAMIC is always set to the start of the
1650 .dynamic section. This call occurs before we have processed the
1651 symbols for any dynamic object, so we don't have to worry about
1652 overriding a dynamic definition. We could set _DYNAMIC in a
1653 linker script, but we only want to define it if we are, in fact,
1654 creating a .dynamic section. We don't want to define it if there
1655 is no .dynamic section, since on some ELF platforms the start up
1656 code examines it to decide how to initialize the process. */
1658 if (! (_bfd_generic_link_add_one_symbol
1659 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1660 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1661 (struct bfd_link_hash_entry
**) &h
)))
1663 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1664 h
->type
= STT_OBJECT
;
1667 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1670 s
= bfd_make_section (abfd
, ".hash");
1672 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1673 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1676 /* Let the backend create the rest of the sections. This lets the
1677 backend set the right flags. The backend will normally create
1678 the .got and .plt sections. */
1679 bed
= get_elf_backend_data (abfd
);
1680 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1683 elf_hash_table (info
)->dynamic_sections_created
= true;
1688 /* Add an entry to the .dynamic table. */
1691 elf_add_dynamic_entry (info
, tag
, val
)
1692 struct bfd_link_info
*info
;
1696 Elf_Internal_Dyn dyn
;
1700 bfd_byte
*newcontents
;
1702 dynobj
= elf_hash_table (info
)->dynobj
;
1704 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1705 BFD_ASSERT (s
!= NULL
);
1707 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1708 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1709 if (newcontents
== NULL
)
1713 dyn
.d_un
.d_val
= val
;
1714 elf_swap_dyn_out (dynobj
, &dyn
,
1715 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1717 s
->_raw_size
= newsize
;
1718 s
->contents
= newcontents
;
1724 /* Read and swap the relocs for a section. They may have been cached.
1725 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1726 they are used as buffers to read into. They are known to be large
1727 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1728 value is allocated using either malloc or bfd_alloc, according to
1729 the KEEP_MEMORY argument. */
1732 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1736 PTR external_relocs
;
1737 Elf_Internal_Rela
*internal_relocs
;
1738 boolean keep_memory
;
1740 Elf_Internal_Shdr
*rel_hdr
;
1742 Elf_Internal_Rela
*alloc2
= NULL
;
1744 if (elf_section_data (o
)->relocs
!= NULL
)
1745 return elf_section_data (o
)->relocs
;
1747 if (o
->reloc_count
== 0)
1750 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1752 if (internal_relocs
== NULL
)
1756 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1758 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1760 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1761 if (internal_relocs
== NULL
)
1765 if (external_relocs
== NULL
)
1767 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1770 external_relocs
= alloc1
;
1773 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1774 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1775 != rel_hdr
->sh_size
))
1778 /* Swap in the relocs. For convenience, we always produce an
1779 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1781 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1783 Elf_External_Rel
*erel
;
1784 Elf_External_Rel
*erelend
;
1785 Elf_Internal_Rela
*irela
;
1787 erel
= (Elf_External_Rel
*) external_relocs
;
1788 erelend
= erel
+ o
->reloc_count
;
1789 irela
= internal_relocs
;
1790 for (; erel
< erelend
; erel
++, irela
++)
1792 Elf_Internal_Rel irel
;
1794 elf_swap_reloc_in (abfd
, erel
, &irel
);
1795 irela
->r_offset
= irel
.r_offset
;
1796 irela
->r_info
= irel
.r_info
;
1797 irela
->r_addend
= 0;
1802 Elf_External_Rela
*erela
;
1803 Elf_External_Rela
*erelaend
;
1804 Elf_Internal_Rela
*irela
;
1806 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1808 erela
= (Elf_External_Rela
*) external_relocs
;
1809 erelaend
= erela
+ o
->reloc_count
;
1810 irela
= internal_relocs
;
1811 for (; erela
< erelaend
; erela
++, irela
++)
1812 elf_swap_reloca_in (abfd
, erela
, irela
);
1815 /* Cache the results for next time, if we can. */
1817 elf_section_data (o
)->relocs
= internal_relocs
;
1822 /* Don't free alloc2, since if it was allocated we are passing it
1823 back (under the name of internal_relocs). */
1825 return internal_relocs
;
1836 /* Record an assignment to a symbol made by a linker script. We need
1837 this in case some dynamic object refers to this symbol. */
1841 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
1843 struct bfd_link_info
*info
;
1847 struct elf_link_hash_entry
*h
;
1849 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1852 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
1856 if (h
->root
.type
== bfd_link_hash_new
)
1857 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
1859 /* If this symbol is being provided by the linker script, and it is
1860 currently defined by a dynamic object, but not by a regular
1861 object, then mark it as undefined so that the generic linker will
1862 force the correct value. */
1864 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1865 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1866 h
->root
.type
= bfd_link_hash_undefined
;
1868 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1869 h
->type
= STT_OBJECT
;
1871 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1872 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
1874 && h
->dynindx
== -1)
1876 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1879 /* If this is a weak defined symbol, and we know a corresponding
1880 real symbol from the same dynamic object, make sure the real
1881 symbol is also made into a dynamic symbol. */
1882 if (h
->weakdef
!= NULL
1883 && h
->weakdef
->dynindx
== -1)
1885 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1893 /* This structure is used to pass information to
1894 elf_link_assign_sym_version. */
1896 struct elf_assign_sym_version_info
1900 /* General link information. */
1901 struct bfd_link_info
*info
;
1903 struct bfd_elf_version_tree
*verdefs
;
1904 /* Whether we are exporting all dynamic symbols. */
1905 boolean export_dynamic
;
1906 /* Whether we removed any symbols from the dynamic symbol table. */
1907 boolean removed_dynamic
;
1908 /* Whether we had a failure. */
1912 /* This structure is used to pass information to
1913 elf_link_find_version_dependencies. */
1915 struct elf_find_verdep_info
1919 /* General link information. */
1920 struct bfd_link_info
*info
;
1921 /* The number of dependencies. */
1923 /* Whether we had a failure. */
1927 /* Array used to determine the number of hash table buckets to use
1928 based on the number of symbols there are. If there are fewer than
1929 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1930 fewer than 37 we use 17 buckets, and so forth. We never use more
1931 than 32771 buckets. */
1933 static const size_t elf_buckets
[] =
1935 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
1939 /* Set up the sizes and contents of the ELF dynamic sections. This is
1940 called by the ELF linker emulation before_allocation routine. We
1941 must set the sizes of the sections before the linker sets the
1942 addresses of the various sections. */
1945 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
1946 export_dynamic
, filter_shlib
,
1947 auxiliary_filters
, info
, sinterpptr
,
1952 boolean export_dynamic
;
1953 const char *filter_shlib
;
1954 const char * const *auxiliary_filters
;
1955 struct bfd_link_info
*info
;
1956 asection
**sinterpptr
;
1957 struct bfd_elf_version_tree
*verdefs
;
1959 bfd_size_type soname_indx
;
1961 struct elf_backend_data
*bed
;
1962 bfd_size_type old_dynsymcount
;
1968 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1971 /* The backend may have to create some sections regardless of whether
1972 we're dynamic or not. */
1973 bed
= get_elf_backend_data (output_bfd
);
1974 if (bed
->elf_backend_always_size_sections
1975 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
1978 dynobj
= elf_hash_table (info
)->dynobj
;
1980 /* If there were no dynamic objects in the link, there is nothing to
1985 /* If we are supposed to export all symbols into the dynamic symbol
1986 table (this is not the normal case), then do so. */
1989 struct elf_info_failed eif
;
1993 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
1999 if (elf_hash_table (info
)->dynamic_sections_created
)
2001 struct elf_info_failed eif
;
2002 struct elf_link_hash_entry
*h
;
2003 bfd_size_type strsize
;
2005 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2006 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2010 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2011 soname
, true, true);
2012 if (soname_indx
== (bfd_size_type
) -1
2013 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2019 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2027 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2029 if (indx
== (bfd_size_type
) -1
2030 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2034 if (filter_shlib
!= NULL
)
2038 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2039 filter_shlib
, true, true);
2040 if (indx
== (bfd_size_type
) -1
2041 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2045 if (auxiliary_filters
!= NULL
)
2047 const char * const *p
;
2049 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2053 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2055 if (indx
== (bfd_size_type
) -1
2056 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2061 /* Find all symbols which were defined in a dynamic object and make
2062 the backend pick a reasonable value for them. */
2065 elf_link_hash_traverse (elf_hash_table (info
),
2066 elf_adjust_dynamic_symbol
,
2071 /* Add some entries to the .dynamic section. We fill in some of the
2072 values later, in elf_bfd_final_link, but we must add the entries
2073 now so that we know the final size of the .dynamic section. */
2074 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2077 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2078 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2080 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2083 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", 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_FINI
, 0))
2092 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2093 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2094 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2095 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2096 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2097 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2098 sizeof (Elf_External_Sym
)))
2102 /* The backend must work out the sizes of all the other dynamic
2104 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2105 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2108 if (elf_hash_table (info
)->dynamic_sections_created
)
2113 size_t bucketcount
= 0;
2114 Elf_Internal_Sym isym
;
2115 struct elf_assign_sym_version_info sinfo
;
2117 /* Set up the version definition section. */
2118 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2119 BFD_ASSERT (s
!= NULL
);
2121 /* Attach all the symbols to their version information. This
2122 may cause some symbols to be unexported. */
2123 sinfo
.output_bfd
= output_bfd
;
2125 sinfo
.verdefs
= verdefs
;
2126 sinfo
.export_dynamic
= export_dynamic
;
2127 sinfo
.removed_dynamic
= false;
2128 sinfo
.failed
= false;
2130 elf_link_hash_traverse (elf_hash_table (info
),
2131 elf_link_assign_sym_version
,
2136 /* We may have created additional version definitions if we are
2137 just linking a regular application. */
2138 verdefs
= sinfo
.verdefs
;
2140 if (verdefs
== NULL
)
2144 /* Don't include this section in the output file. */
2145 for (spp
= &output_bfd
->sections
;
2146 *spp
!= s
->output_section
;
2147 spp
= &(*spp
)->next
)
2149 *spp
= s
->output_section
->next
;
2150 --output_bfd
->section_count
;
2156 struct bfd_elf_version_tree
*t
;
2158 Elf_Internal_Verdef def
;
2159 Elf_Internal_Verdaux defaux
;
2161 if (sinfo
.removed_dynamic
)
2163 /* Some dynamic symbols were changed to be local
2164 symbols. In this case, we renumber all of the
2165 dynamic symbols, so that we don't have a hole. If
2166 the backend changed dynsymcount, then assume that the
2167 new symbols are at the start. This is the case on
2168 the MIPS. FIXME: The names of the removed symbols
2169 will still be in the dynamic string table, wasting
2171 elf_hash_table (info
)->dynsymcount
=
2172 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2173 elf_link_hash_traverse (elf_hash_table (info
),
2174 elf_link_renumber_dynsyms
,
2181 /* Make space for the base version. */
2182 size
+= sizeof (Elf_External_Verdef
);
2183 size
+= sizeof (Elf_External_Verdaux
);
2186 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2188 struct bfd_elf_version_deps
*n
;
2190 size
+= sizeof (Elf_External_Verdef
);
2191 size
+= sizeof (Elf_External_Verdaux
);
2194 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2195 size
+= sizeof (Elf_External_Verdaux
);
2198 s
->_raw_size
= size
;
2199 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2200 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2203 /* Fill in the version definition section. */
2207 def
.vd_version
= VER_DEF_CURRENT
;
2208 def
.vd_flags
= VER_FLG_BASE
;
2211 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2212 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2213 + sizeof (Elf_External_Verdaux
));
2215 if (soname_indx
!= -1)
2217 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2218 defaux
.vda_name
= soname_indx
;
2225 name
= output_bfd
->filename
;
2226 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2227 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2229 if (indx
== (bfd_size_type
) -1)
2231 defaux
.vda_name
= indx
;
2233 defaux
.vda_next
= 0;
2235 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2236 (Elf_External_Verdef
*)p
);
2237 p
+= sizeof (Elf_External_Verdef
);
2238 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2239 (Elf_External_Verdaux
*) p
);
2240 p
+= sizeof (Elf_External_Verdaux
);
2242 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2245 struct bfd_elf_version_deps
*n
;
2246 struct elf_link_hash_entry
*h
;
2249 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2252 /* Add a symbol representing this version. */
2254 if (! (_bfd_generic_link_add_one_symbol
2255 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2256 (bfd_vma
) 0, (const char *) NULL
, false,
2257 get_elf_backend_data (dynobj
)->collect
,
2258 (struct bfd_link_hash_entry
**) &h
)))
2260 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2261 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2262 h
->type
= STT_OBJECT
;
2263 h
->verinfo
.vertree
= t
;
2265 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2268 def
.vd_version
= VER_DEF_CURRENT
;
2270 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2271 def
.vd_flags
|= VER_FLG_WEAK
;
2272 def
.vd_ndx
= t
->vernum
+ 1;
2273 def
.vd_cnt
= cdeps
+ 1;
2274 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2275 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2276 if (t
->next
!= NULL
)
2277 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2278 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2282 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2283 (Elf_External_Verdef
*) p
);
2284 p
+= sizeof (Elf_External_Verdef
);
2286 defaux
.vda_name
= h
->dynstr_index
;
2287 if (t
->deps
== NULL
)
2288 defaux
.vda_next
= 0;
2290 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2291 t
->name_indx
= defaux
.vda_name
;
2293 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2294 (Elf_External_Verdaux
*) p
);
2295 p
+= sizeof (Elf_External_Verdaux
);
2297 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2299 defaux
.vda_name
= n
->version_needed
->name_indx
;
2300 if (n
->next
== NULL
)
2301 defaux
.vda_next
= 0;
2303 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2305 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2306 (Elf_External_Verdaux
*) p
);
2307 p
+= sizeof (Elf_External_Verdaux
);
2311 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2312 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2315 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2318 /* Work out the size of the version reference section. */
2320 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2321 BFD_ASSERT (s
!= NULL
);
2323 struct elf_find_verdep_info sinfo
;
2325 sinfo
.output_bfd
= output_bfd
;
2327 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2328 if (sinfo
.vers
== 0)
2330 sinfo
.failed
= false;
2332 elf_link_hash_traverse (elf_hash_table (info
),
2333 elf_link_find_version_dependencies
,
2336 if (elf_tdata (output_bfd
)->verref
== NULL
)
2340 /* We don't have any version definitions, so we can just
2341 remove the section. */
2343 for (spp
= &output_bfd
->sections
;
2344 *spp
!= s
->output_section
;
2345 spp
= &(*spp
)->next
)
2347 *spp
= s
->output_section
->next
;
2348 --output_bfd
->section_count
;
2352 Elf_Internal_Verneed
*t
;
2357 /* Build the version definition section. */
2360 for (t
= elf_tdata (output_bfd
)->verref
;
2364 Elf_Internal_Vernaux
*a
;
2366 size
+= sizeof (Elf_External_Verneed
);
2368 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2369 size
+= sizeof (Elf_External_Vernaux
);
2372 s
->_raw_size
= size
;
2373 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2374 if (s
->contents
== NULL
)
2378 for (t
= elf_tdata (output_bfd
)->verref
;
2383 Elf_Internal_Vernaux
*a
;
2387 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2390 t
->vn_version
= VER_NEED_CURRENT
;
2392 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2393 t
->vn_bfd
->filename
, true, false);
2394 if (indx
== (bfd_size_type
) -1)
2397 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2398 if (t
->vn_nextref
== NULL
)
2401 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2402 + caux
* sizeof (Elf_External_Vernaux
));
2404 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2405 (Elf_External_Verneed
*) p
);
2406 p
+= sizeof (Elf_External_Verneed
);
2408 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2410 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2412 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2413 a
->vna_nodename
, true, false);
2414 if (indx
== (bfd_size_type
) -1)
2417 if (a
->vna_nextptr
== NULL
)
2420 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2422 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2423 (Elf_External_Vernaux
*) p
);
2424 p
+= sizeof (Elf_External_Vernaux
);
2428 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2429 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2432 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2436 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2438 /* Work out the size of the symbol version section. */
2439 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2440 BFD_ASSERT (s
!= NULL
);
2441 if (dynsymcount
== 0
2442 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2446 /* We don't need any symbol versions; just discard the
2448 for (spp
= &output_bfd
->sections
;
2449 *spp
!= s
->output_section
;
2450 spp
= &(*spp
)->next
)
2452 *spp
= s
->output_section
->next
;
2453 --output_bfd
->section_count
;
2457 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2458 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2459 if (s
->contents
== NULL
)
2462 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2466 /* Set the size of the .dynsym and .hash sections. We counted
2467 the number of dynamic symbols in elf_link_add_object_symbols.
2468 We will build the contents of .dynsym and .hash when we build
2469 the final symbol table, because until then we do not know the
2470 correct value to give the symbols. We built the .dynstr
2471 section as we went along in elf_link_add_object_symbols. */
2472 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2473 BFD_ASSERT (s
!= NULL
);
2474 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2475 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2476 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2479 /* The first entry in .dynsym is a dummy symbol. */
2486 elf_swap_symbol_out (output_bfd
, &isym
,
2487 (PTR
) (Elf_External_Sym
*) s
->contents
);
2489 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2491 bucketcount
= elf_buckets
[i
];
2492 if (dynsymcount
< elf_buckets
[i
+ 1])
2496 s
= bfd_get_section_by_name (dynobj
, ".hash");
2497 BFD_ASSERT (s
!= NULL
);
2498 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2499 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2500 if (s
->contents
== NULL
)
2502 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2504 put_word (output_bfd
, bucketcount
, s
->contents
);
2505 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2507 elf_hash_table (info
)->bucketcount
= bucketcount
;
2509 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2510 BFD_ASSERT (s
!= NULL
);
2511 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2513 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2520 /* Make the backend pick a good value for a dynamic symbol. This is
2521 called via elf_link_hash_traverse, and also calls itself
2525 elf_adjust_dynamic_symbol (h
, data
)
2526 struct elf_link_hash_entry
*h
;
2529 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2531 struct elf_backend_data
*bed
;
2533 /* Ignore indirect symbols. These are added by the versioning code. */
2534 if (h
->root
.type
== bfd_link_hash_indirect
)
2537 /* If this symbol was mentioned in a non-ELF file, try to set
2538 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2539 permit a non-ELF file to correctly refer to a symbol defined in
2540 an ELF dynamic object. */
2541 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2543 if (h
->root
.type
!= bfd_link_hash_defined
2544 && h
->root
.type
!= bfd_link_hash_defweak
)
2545 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2548 if (h
->root
.u
.def
.section
->owner
!= NULL
2549 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2550 == bfd_target_elf_flavour
))
2551 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2553 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2556 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2557 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
2559 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2567 /* If this is a final link, and the symbol was defined as a common
2568 symbol in a regular object file, and there was no definition in
2569 any dynamic object, then the linker will have allocated space for
2570 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2571 flag will not have been set. */
2572 if (h
->root
.type
== bfd_link_hash_defined
2573 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2574 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2575 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2576 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2577 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2579 /* If -Bsymbolic was used (which means to bind references to global
2580 symbols to the definition within the shared object), and this
2581 symbol was defined in a regular object, then it actually doesn't
2582 need a PLT entry. */
2583 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2584 && eif
->info
->shared
2585 && eif
->info
->symbolic
2586 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2587 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2589 /* If this symbol does not require a PLT entry, and it is not
2590 defined by a dynamic object, or is not referenced by a regular
2591 object, ignore it. We do have to handle a weak defined symbol,
2592 even if no regular object refers to it, if we decided to add it
2593 to the dynamic symbol table. FIXME: Do we normally need to worry
2594 about symbols which are defined by one dynamic object and
2595 referenced by another one? */
2596 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2597 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2598 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2599 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2600 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2603 /* If we've already adjusted this symbol, don't do it again. This
2604 can happen via a recursive call. */
2605 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2608 /* Don't look at this symbol again. Note that we must set this
2609 after checking the above conditions, because we may look at a
2610 symbol once, decide not to do anything, and then get called
2611 recursively later after REF_REGULAR is set below. */
2612 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2614 /* If this is a weak definition, and we know a real definition, and
2615 the real symbol is not itself defined by a regular object file,
2616 then get a good value for the real definition. We handle the
2617 real symbol first, for the convenience of the backend routine.
2619 Note that there is a confusing case here. If the real definition
2620 is defined by a regular object file, we don't get the real symbol
2621 from the dynamic object, but we do get the weak symbol. If the
2622 processor backend uses a COPY reloc, then if some routine in the
2623 dynamic object changes the real symbol, we will not see that
2624 change in the corresponding weak symbol. This is the way other
2625 ELF linkers work as well, and seems to be a result of the shared
2628 I will clarify this issue. Most SVR4 shared libraries define the
2629 variable _timezone and define timezone as a weak synonym. The
2630 tzset call changes _timezone. If you write
2631 extern int timezone;
2633 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2634 you might expect that, since timezone is a synonym for _timezone,
2635 the same number will print both times. However, if the processor
2636 backend uses a COPY reloc, then actually timezone will be copied
2637 into your process image, and, since you define _timezone
2638 yourself, _timezone will not. Thus timezone and _timezone will
2639 wind up at different memory locations. The tzset call will set
2640 _timezone, leaving timezone unchanged. */
2642 if (h
->weakdef
!= NULL
)
2644 struct elf_link_hash_entry
*weakdef
;
2646 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2647 || h
->root
.type
== bfd_link_hash_defweak
);
2648 weakdef
= h
->weakdef
;
2649 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2650 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2651 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2652 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2654 /* This symbol is defined by a regular object file, so we
2655 will not do anything special. Clear weakdef for the
2656 convenience of the processor backend. */
2661 /* There is an implicit reference by a regular object file
2662 via the weak symbol. */
2663 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2664 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2669 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2670 bed
= get_elf_backend_data (dynobj
);
2671 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2680 /* This routine is used to export all defined symbols into the dynamic
2681 symbol table. It is called via elf_link_hash_traverse. */
2684 elf_export_symbol (h
, data
)
2685 struct elf_link_hash_entry
*h
;
2688 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2690 /* Ignore indirect symbols. These are added by the versioning code. */
2691 if (h
->root
.type
== bfd_link_hash_indirect
)
2694 if (h
->dynindx
== -1
2695 && (h
->elf_link_hash_flags
2696 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2698 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2708 /* Look through the symbols which are defined in other shared
2709 libraries and referenced here. Update the list of version
2710 dependencies. This will be put into the .gnu.version_r section.
2711 This function is called via elf_link_hash_traverse. */
2714 elf_link_find_version_dependencies (h
, data
)
2715 struct elf_link_hash_entry
*h
;
2718 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2719 Elf_Internal_Verneed
*t
;
2720 Elf_Internal_Vernaux
*a
;
2722 /* We only care about symbols defined in shared objects with version
2724 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2725 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2727 || h
->verinfo
.verdef
== NULL
)
2730 /* See if we already know about this version. */
2731 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
2733 if (t
->vn_bfd
== h
->verinfo
.verdef
->vd_bfd
)
2736 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2737 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2743 /* This is a new version. Add it to tree we are building. */
2747 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
2750 rinfo
->failed
= true;
2754 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2755 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
2756 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
2759 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
2761 /* Note that we are copying a string pointer here, and testing it
2762 above. If bfd_elf_string_from_elf_section is ever changed to
2763 discard the string data when low in memory, this will have to be
2765 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2767 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2768 a
->vna_nextptr
= t
->vn_auxptr
;
2770 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2773 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2780 /* Figure out appropriate versions for all the symbols. We may not
2781 have the version number script until we have read all of the input
2782 files, so until that point we don't know which symbols should be
2783 local. This function is called via elf_link_hash_traverse. */
2786 elf_link_assign_sym_version (h
, data
)
2787 struct elf_link_hash_entry
*h
;
2790 struct elf_assign_sym_version_info
*sinfo
=
2791 (struct elf_assign_sym_version_info
*) data
;
2792 struct bfd_link_info
*info
= sinfo
->info
;
2795 /* We only need version numbers for symbols defined in regular
2797 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2800 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2801 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2803 struct bfd_elf_version_tree
*t
;
2808 /* There are two consecutive ELF_VER_CHR characters if this is
2809 not a hidden symbol. */
2811 if (*p
== ELF_VER_CHR
)
2817 /* If there is no version string, we can just return out. */
2821 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
2825 /* Look for the version. If we find it, it is no longer weak. */
2826 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
2828 if (strcmp (t
->name
, p
) == 0)
2830 h
->verinfo
.vertree
= t
;
2833 /* See if there is anything to force this symbol to
2835 if (t
->locals
!= NULL
)
2839 struct bfd_elf_version_expr
*d
;
2841 len
= p
- h
->root
.root
.string
;
2842 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
2845 strncpy (alc
, h
->root
.root
.string
, len
- 1);
2846 alc
[len
- 1] = '\0';
2847 if (alc
[len
- 2] == ELF_VER_CHR
)
2848 alc
[len
- 2] = '\0';
2850 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
2852 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
2853 || fnmatch (d
->match
, alc
, 0) == 0)
2855 if (h
->dynindx
!= -1
2857 && ! sinfo
->export_dynamic
2858 && (h
->elf_link_hash_flags
2859 & ELF_LINK_HASH_NEEDS_PLT
) == 0)
2861 sinfo
->removed_dynamic
= true;
2862 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
2864 /* FIXME: The name of the symbol has
2865 already been recorded in the dynamic
2866 string table section. */
2873 bfd_release (sinfo
->output_bfd
, alc
);
2880 /* If we are building an application, we need to create a
2881 version node for this version. */
2882 if (t
== NULL
&& ! info
->shared
)
2884 struct bfd_elf_version_tree
**pp
;
2887 /* If we aren't going to export this symbol, we don't need
2888 to worry about it. */
2889 if (h
->dynindx
== -1)
2892 t
= ((struct bfd_elf_version_tree
*)
2893 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
2896 sinfo
->failed
= true;
2905 t
->name_indx
= (unsigned int) -1;
2909 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2911 t
->vernum
= version_index
;
2915 h
->verinfo
.vertree
= t
;
2919 /* We could not find the version for a symbol when
2920 generating a shared archive. Return an error. */
2921 (*_bfd_error_handler
)
2922 ("%s: undefined version name %s",
2923 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
2924 bfd_set_error (bfd_error_bad_value
);
2925 sinfo
->failed
= true;
2930 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
2933 /* If we don't have a version for this symbol, see if we can find
2935 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
2937 struct bfd_elf_version_tree
*t
;
2938 struct bfd_elf_version_tree
*deflt
;
2939 struct bfd_elf_version_expr
*d
;
2941 /* See if can find what version this symbol is in. If the
2942 symbol is supposed to eb local, then don't actually register
2945 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
2947 if (t
->globals
!= NULL
)
2949 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
2951 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
2953 h
->verinfo
.vertree
= t
;
2962 if (t
->locals
!= NULL
)
2964 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
2966 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
2968 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
2970 h
->verinfo
.vertree
= t
;
2971 if (h
->dynindx
!= -1
2973 && ! sinfo
->export_dynamic
2974 && (h
->elf_link_hash_flags
2975 & ELF_LINK_HASH_NEEDS_PLT
) == 0)
2977 sinfo
->removed_dynamic
= true;
2978 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
2980 /* FIXME: The name of the symbol has already
2981 been recorded in the dynamic string table
2993 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2995 h
->verinfo
.vertree
= deflt
;
2996 if (h
->dynindx
!= -1
2998 && ! sinfo
->export_dynamic
2999 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3001 sinfo
->removed_dynamic
= true;
3002 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3004 /* FIXME: The name of the symbol has already been
3005 recorded in the dynamic string table section. */
3013 /* This function is used to renumber the dynamic symbols, if some of
3014 them are removed because they are marked as local. This is called
3015 via elf_link_hash_traverse. */
3018 elf_link_renumber_dynsyms (h
, data
)
3019 struct elf_link_hash_entry
*h
;
3022 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3024 if (h
->dynindx
!= -1)
3026 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3027 ++elf_hash_table (info
)->dynsymcount
;
3033 /* Final phase of ELF linker. */
3035 /* A structure we use to avoid passing large numbers of arguments. */
3037 struct elf_final_link_info
3039 /* General link information. */
3040 struct bfd_link_info
*info
;
3043 /* Symbol string table. */
3044 struct bfd_strtab_hash
*symstrtab
;
3045 /* .dynsym section. */
3046 asection
*dynsym_sec
;
3047 /* .hash section. */
3049 /* symbol version section (.gnu.version). */
3050 asection
*symver_sec
;
3051 /* Buffer large enough to hold contents of any section. */
3053 /* Buffer large enough to hold external relocs of any section. */
3054 PTR external_relocs
;
3055 /* Buffer large enough to hold internal relocs of any section. */
3056 Elf_Internal_Rela
*internal_relocs
;
3057 /* Buffer large enough to hold external local symbols of any input
3059 Elf_External_Sym
*external_syms
;
3060 /* Buffer large enough to hold internal local symbols of any input
3062 Elf_Internal_Sym
*internal_syms
;
3063 /* Array large enough to hold a symbol index for each local symbol
3064 of any input BFD. */
3066 /* Array large enough to hold a section pointer for each local
3067 symbol of any input BFD. */
3068 asection
**sections
;
3069 /* Buffer to hold swapped out symbols. */
3070 Elf_External_Sym
*symbuf
;
3071 /* Number of swapped out symbols in buffer. */
3072 size_t symbuf_count
;
3073 /* Number of symbols which fit in symbuf. */
3077 static boolean elf_link_output_sym
3078 PARAMS ((struct elf_final_link_info
*, const char *,
3079 Elf_Internal_Sym
*, asection
*));
3080 static boolean elf_link_flush_output_syms
3081 PARAMS ((struct elf_final_link_info
*));
3082 static boolean elf_link_output_extsym
3083 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3084 static boolean elf_link_input_bfd
3085 PARAMS ((struct elf_final_link_info
*, bfd
*));
3086 static boolean elf_reloc_link_order
3087 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3088 struct bfd_link_order
*));
3090 /* This struct is used to pass information to elf_link_output_extsym. */
3092 struct elf_outext_info
3096 struct elf_final_link_info
*finfo
;
3099 /* Do the final step of an ELF link. */
3102 elf_bfd_final_link (abfd
, info
)
3104 struct bfd_link_info
*info
;
3108 struct elf_final_link_info finfo
;
3109 register asection
*o
;
3110 register struct bfd_link_order
*p
;
3112 size_t max_contents_size
;
3113 size_t max_external_reloc_size
;
3114 size_t max_internal_reloc_count
;
3115 size_t max_sym_count
;
3117 Elf_Internal_Sym elfsym
;
3119 Elf_Internal_Shdr
*symtab_hdr
;
3120 Elf_Internal_Shdr
*symstrtab_hdr
;
3121 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3122 struct elf_outext_info eoinfo
;
3125 abfd
->flags
|= DYNAMIC
;
3127 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3128 dynobj
= elf_hash_table (info
)->dynobj
;
3131 finfo
.output_bfd
= abfd
;
3132 finfo
.symstrtab
= elf_stringtab_init ();
3133 if (finfo
.symstrtab
== NULL
)
3138 finfo
.dynsym_sec
= NULL
;
3139 finfo
.hash_sec
= NULL
;
3140 finfo
.symver_sec
= NULL
;
3144 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3145 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3146 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3147 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3148 /* Note that it is OK if symver_sec is NULL. */
3151 finfo
.contents
= NULL
;
3152 finfo
.external_relocs
= NULL
;
3153 finfo
.internal_relocs
= NULL
;
3154 finfo
.external_syms
= NULL
;
3155 finfo
.internal_syms
= NULL
;
3156 finfo
.indices
= NULL
;
3157 finfo
.sections
= NULL
;
3158 finfo
.symbuf
= NULL
;
3159 finfo
.symbuf_count
= 0;
3161 /* Count up the number of relocations we will output for each output
3162 section, so that we know the sizes of the reloc sections. We
3163 also figure out some maximum sizes. */
3164 max_contents_size
= 0;
3165 max_external_reloc_size
= 0;
3166 max_internal_reloc_count
= 0;
3168 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3172 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3174 if (p
->type
== bfd_section_reloc_link_order
3175 || p
->type
== bfd_symbol_reloc_link_order
)
3177 else if (p
->type
== bfd_indirect_link_order
)
3181 sec
= p
->u
.indirect
.section
;
3183 /* Mark all sections which are to be included in the
3184 link. This will normally be every section. We need
3185 to do this so that we can identify any sections which
3186 the linker has decided to not include. */
3187 sec
->linker_mark
= true;
3189 if (info
->relocateable
)
3190 o
->reloc_count
+= sec
->reloc_count
;
3192 if (sec
->_raw_size
> max_contents_size
)
3193 max_contents_size
= sec
->_raw_size
;
3194 if (sec
->_cooked_size
> max_contents_size
)
3195 max_contents_size
= sec
->_cooked_size
;
3197 /* We are interested in just local symbols, not all
3199 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3200 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3204 if (elf_bad_symtab (sec
->owner
))
3205 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3206 / sizeof (Elf_External_Sym
));
3208 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3210 if (sym_count
> max_sym_count
)
3211 max_sym_count
= sym_count
;
3213 if ((sec
->flags
& SEC_RELOC
) != 0)
3217 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3218 if (ext_size
> max_external_reloc_size
)
3219 max_external_reloc_size
= ext_size
;
3220 if (sec
->reloc_count
> max_internal_reloc_count
)
3221 max_internal_reloc_count
= sec
->reloc_count
;
3227 if (o
->reloc_count
> 0)
3228 o
->flags
|= SEC_RELOC
;
3231 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3232 set it (this is probably a bug) and if it is set
3233 assign_section_numbers will create a reloc section. */
3234 o
->flags
&=~ SEC_RELOC
;
3237 /* If the SEC_ALLOC flag is not set, force the section VMA to
3238 zero. This is done in elf_fake_sections as well, but forcing
3239 the VMA to 0 here will ensure that relocs against these
3240 sections are handled correctly. */
3241 if ((o
->flags
& SEC_ALLOC
) == 0
3242 && ! o
->user_set_vma
)
3246 /* Figure out the file positions for everything but the symbol table
3247 and the relocs. We set symcount to force assign_section_numbers
3248 to create a symbol table. */
3249 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3250 BFD_ASSERT (! abfd
->output_has_begun
);
3251 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3254 /* That created the reloc sections. Set their sizes, and assign
3255 them file positions, and allocate some buffers. */
3256 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3258 if ((o
->flags
& SEC_RELOC
) != 0)
3260 Elf_Internal_Shdr
*rel_hdr
;
3261 register struct elf_link_hash_entry
**p
, **pend
;
3263 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3265 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3267 /* The contents field must last into write_object_contents,
3268 so we allocate it with bfd_alloc rather than malloc. */
3269 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3270 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3273 p
= ((struct elf_link_hash_entry
**)
3274 bfd_malloc (o
->reloc_count
3275 * sizeof (struct elf_link_hash_entry
*)));
3276 if (p
== NULL
&& o
->reloc_count
!= 0)
3278 elf_section_data (o
)->rel_hashes
= p
;
3279 pend
= p
+ o
->reloc_count
;
3280 for (; p
< pend
; p
++)
3283 /* Use the reloc_count field as an index when outputting the
3289 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3291 /* We have now assigned file positions for all the sections except
3292 .symtab and .strtab. We start the .symtab section at the current
3293 file position, and write directly to it. We build the .strtab
3294 section in memory. */
3296 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3297 /* sh_name is set in prep_headers. */
3298 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3299 symtab_hdr
->sh_flags
= 0;
3300 symtab_hdr
->sh_addr
= 0;
3301 symtab_hdr
->sh_size
= 0;
3302 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3303 /* sh_link is set in assign_section_numbers. */
3304 /* sh_info is set below. */
3305 /* sh_offset is set just below. */
3306 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3308 off
= elf_tdata (abfd
)->next_file_pos
;
3309 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3311 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3312 incorrect. We do not yet know the size of the .symtab section.
3313 We correct next_file_pos below, after we do know the size. */
3315 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3316 continuously seeking to the right position in the file. */
3317 if (! info
->keep_memory
|| max_sym_count
< 20)
3318 finfo
.symbuf_size
= 20;
3320 finfo
.symbuf_size
= max_sym_count
;
3321 finfo
.symbuf
= ((Elf_External_Sym
*)
3322 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3323 if (finfo
.symbuf
== NULL
)
3326 /* Start writing out the symbol table. The first symbol is always a
3328 if (info
->strip
!= strip_all
|| info
->relocateable
)
3330 elfsym
.st_value
= 0;
3333 elfsym
.st_other
= 0;
3334 elfsym
.st_shndx
= SHN_UNDEF
;
3335 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3336 &elfsym
, bfd_und_section_ptr
))
3341 /* Some standard ELF linkers do this, but we don't because it causes
3342 bootstrap comparison failures. */
3343 /* Output a file symbol for the output file as the second symbol.
3344 We output this even if we are discarding local symbols, although
3345 I'm not sure if this is correct. */
3346 elfsym
.st_value
= 0;
3348 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3349 elfsym
.st_other
= 0;
3350 elfsym
.st_shndx
= SHN_ABS
;
3351 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3352 &elfsym
, bfd_abs_section_ptr
))
3356 /* Output a symbol for each section. We output these even if we are
3357 discarding local symbols, since they are used for relocs. These
3358 symbols have no names. We store the index of each one in the
3359 index field of the section, so that we can find it again when
3360 outputting relocs. */
3361 if (info
->strip
!= strip_all
|| info
->relocateable
)
3364 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3365 elfsym
.st_other
= 0;
3366 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3368 o
= section_from_elf_index (abfd
, i
);
3370 o
->target_index
= abfd
->symcount
;
3371 elfsym
.st_shndx
= i
;
3372 if (info
->relocateable
|| o
== NULL
)
3373 elfsym
.st_value
= 0;
3375 elfsym
.st_value
= o
->vma
;
3376 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3382 /* Allocate some memory to hold information read in from the input
3384 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3385 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3386 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3387 bfd_malloc (max_internal_reloc_count
3388 * sizeof (Elf_Internal_Rela
)));
3389 finfo
.external_syms
= ((Elf_External_Sym
*)
3390 bfd_malloc (max_sym_count
3391 * sizeof (Elf_External_Sym
)));
3392 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3393 bfd_malloc (max_sym_count
3394 * sizeof (Elf_Internal_Sym
)));
3395 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3396 finfo
.sections
= ((asection
**)
3397 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3398 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3399 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3400 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3401 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3402 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3403 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3404 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3407 /* Since ELF permits relocations to be against local symbols, we
3408 must have the local symbols available when we do the relocations.
3409 Since we would rather only read the local symbols once, and we
3410 would rather not keep them in memory, we handle all the
3411 relocations for a single input file at the same time.
3413 Unfortunately, there is no way to know the total number of local
3414 symbols until we have seen all of them, and the local symbol
3415 indices precede the global symbol indices. This means that when
3416 we are generating relocateable output, and we see a reloc against
3417 a global symbol, we can not know the symbol index until we have
3418 finished examining all the local symbols to see which ones we are
3419 going to output. To deal with this, we keep the relocations in
3420 memory, and don't output them until the end of the link. This is
3421 an unfortunate waste of memory, but I don't see a good way around
3422 it. Fortunately, it only happens when performing a relocateable
3423 link, which is not the common case. FIXME: If keep_memory is set
3424 we could write the relocs out and then read them again; I don't
3425 know how bad the memory loss will be. */
3427 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3428 sub
->output_has_begun
= false;
3429 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3431 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3433 if (p
->type
== bfd_indirect_link_order
3434 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3435 == bfd_target_elf_flavour
))
3437 sub
= p
->u
.indirect
.section
->owner
;
3438 if (! sub
->output_has_begun
)
3440 if (! elf_link_input_bfd (&finfo
, sub
))
3442 sub
->output_has_begun
= true;
3445 else if (p
->type
== bfd_section_reloc_link_order
3446 || p
->type
== bfd_symbol_reloc_link_order
)
3448 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3453 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3459 /* That wrote out all the local symbols. Finish up the symbol table
3460 with the global symbols. */
3462 if (info
->strip
!= strip_all
&& info
->shared
)
3464 /* Output any global symbols that got converted to local in a
3465 version script. We do this in a separate step since ELF
3466 requires all local symbols to appear prior to any global
3467 symbols. FIXME: We should only do this if some global
3468 symbols were, in fact, converted to become local. FIXME:
3469 Will this work correctly with the Irix 5 linker? */
3470 eoinfo
.failed
= false;
3471 eoinfo
.finfo
= &finfo
;
3472 eoinfo
.localsyms
= true;
3473 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3479 /* The sh_info field records the index of the first non local
3481 symtab_hdr
->sh_info
= abfd
->symcount
;
3483 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3485 /* We get the global symbols from the hash table. */
3486 eoinfo
.failed
= false;
3487 eoinfo
.localsyms
= false;
3488 eoinfo
.finfo
= &finfo
;
3489 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3494 /* Flush all symbols to the file. */
3495 if (! elf_link_flush_output_syms (&finfo
))
3498 /* Now we know the size of the symtab section. */
3499 off
+= symtab_hdr
->sh_size
;
3501 /* Finish up and write out the symbol string table (.strtab)
3503 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3504 /* sh_name was set in prep_headers. */
3505 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3506 symstrtab_hdr
->sh_flags
= 0;
3507 symstrtab_hdr
->sh_addr
= 0;
3508 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3509 symstrtab_hdr
->sh_entsize
= 0;
3510 symstrtab_hdr
->sh_link
= 0;
3511 symstrtab_hdr
->sh_info
= 0;
3512 /* sh_offset is set just below. */
3513 symstrtab_hdr
->sh_addralign
= 1;
3515 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3516 elf_tdata (abfd
)->next_file_pos
= off
;
3518 if (abfd
->symcount
> 0)
3520 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3521 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3525 /* Adjust the relocs to have the correct symbol indices. */
3526 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3528 struct elf_link_hash_entry
**rel_hash
;
3529 Elf_Internal_Shdr
*rel_hdr
;
3531 if ((o
->flags
& SEC_RELOC
) == 0)
3534 rel_hash
= elf_section_data (o
)->rel_hashes
;
3535 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3536 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3538 if (*rel_hash
== NULL
)
3541 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3543 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3545 Elf_External_Rel
*erel
;
3546 Elf_Internal_Rel irel
;
3548 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3549 elf_swap_reloc_in (abfd
, erel
, &irel
);
3550 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3551 ELF_R_TYPE (irel
.r_info
));
3552 elf_swap_reloc_out (abfd
, &irel
, erel
);
3556 Elf_External_Rela
*erela
;
3557 Elf_Internal_Rela irela
;
3559 BFD_ASSERT (rel_hdr
->sh_entsize
3560 == sizeof (Elf_External_Rela
));
3562 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3563 elf_swap_reloca_in (abfd
, erela
, &irela
);
3564 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3565 ELF_R_TYPE (irela
.r_info
));
3566 elf_swap_reloca_out (abfd
, &irela
, erela
);
3570 /* Set the reloc_count field to 0 to prevent write_relocs from
3571 trying to swap the relocs out itself. */
3575 /* If we are linking against a dynamic object, or generating a
3576 shared library, finish up the dynamic linking information. */
3579 Elf_External_Dyn
*dyncon
, *dynconend
;
3581 /* Fix up .dynamic entries. */
3582 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3583 BFD_ASSERT (o
!= NULL
);
3585 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3586 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3587 for (; dyncon
< dynconend
; dyncon
++)
3589 Elf_Internal_Dyn dyn
;
3593 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3600 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3601 magic _init and _fini symbols. This is pretty ugly,
3602 but we are compatible. */
3610 struct elf_link_hash_entry
*h
;
3612 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3613 false, false, true);
3615 && (h
->root
.type
== bfd_link_hash_defined
3616 || h
->root
.type
== bfd_link_hash_defweak
))
3618 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3619 o
= h
->root
.u
.def
.section
;
3620 if (o
->output_section
!= NULL
)
3621 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3622 + o
->output_offset
);
3625 /* The symbol is imported from another shared
3626 library and does not apply to this one. */
3630 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3645 name
= ".gnu.version_d";
3648 name
= ".gnu.version_r";
3651 name
= ".gnu.version";
3653 o
= bfd_get_section_by_name (abfd
, name
);
3654 BFD_ASSERT (o
!= NULL
);
3655 dyn
.d_un
.d_ptr
= o
->vma
;
3656 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3663 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3668 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3670 Elf_Internal_Shdr
*hdr
;
3672 hdr
= elf_elfsections (abfd
)[i
];
3673 if (hdr
->sh_type
== type
3674 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3676 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3677 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3680 if (dyn
.d_un
.d_val
== 0
3681 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3682 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3686 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3692 /* If we have created any dynamic sections, then output them. */
3695 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3698 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3700 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3701 || o
->_raw_size
== 0)
3703 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3705 /* At this point, we are only interested in sections
3706 created by elf_link_create_dynamic_sections. */
3709 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
3711 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
3713 if (! bfd_set_section_contents (abfd
, o
->output_section
,
3714 o
->contents
, o
->output_offset
,
3722 /* The contents of the .dynstr section are actually in a
3724 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
3725 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
3726 || ! _bfd_stringtab_emit (abfd
,
3727 elf_hash_table (info
)->dynstr
))
3733 /* If we have optimized stabs strings, output them. */
3734 if (elf_hash_table (info
)->stab_info
!= NULL
)
3736 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
3740 if (finfo
.symstrtab
!= NULL
)
3741 _bfd_stringtab_free (finfo
.symstrtab
);
3742 if (finfo
.contents
!= NULL
)
3743 free (finfo
.contents
);
3744 if (finfo
.external_relocs
!= NULL
)
3745 free (finfo
.external_relocs
);
3746 if (finfo
.internal_relocs
!= NULL
)
3747 free (finfo
.internal_relocs
);
3748 if (finfo
.external_syms
!= NULL
)
3749 free (finfo
.external_syms
);
3750 if (finfo
.internal_syms
!= NULL
)
3751 free (finfo
.internal_syms
);
3752 if (finfo
.indices
!= NULL
)
3753 free (finfo
.indices
);
3754 if (finfo
.sections
!= NULL
)
3755 free (finfo
.sections
);
3756 if (finfo
.symbuf
!= NULL
)
3757 free (finfo
.symbuf
);
3758 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3760 if ((o
->flags
& SEC_RELOC
) != 0
3761 && elf_section_data (o
)->rel_hashes
!= NULL
)
3762 free (elf_section_data (o
)->rel_hashes
);
3765 elf_tdata (abfd
)->linker
= true;
3770 if (finfo
.symstrtab
!= NULL
)
3771 _bfd_stringtab_free (finfo
.symstrtab
);
3772 if (finfo
.contents
!= NULL
)
3773 free (finfo
.contents
);
3774 if (finfo
.external_relocs
!= NULL
)
3775 free (finfo
.external_relocs
);
3776 if (finfo
.internal_relocs
!= NULL
)
3777 free (finfo
.internal_relocs
);
3778 if (finfo
.external_syms
!= NULL
)
3779 free (finfo
.external_syms
);
3780 if (finfo
.internal_syms
!= NULL
)
3781 free (finfo
.internal_syms
);
3782 if (finfo
.indices
!= NULL
)
3783 free (finfo
.indices
);
3784 if (finfo
.sections
!= NULL
)
3785 free (finfo
.sections
);
3786 if (finfo
.symbuf
!= NULL
)
3787 free (finfo
.symbuf
);
3788 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3790 if ((o
->flags
& SEC_RELOC
) != 0
3791 && elf_section_data (o
)->rel_hashes
!= NULL
)
3792 free (elf_section_data (o
)->rel_hashes
);
3798 /* Add a symbol to the output symbol table. */
3801 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
3802 struct elf_final_link_info
*finfo
;
3804 Elf_Internal_Sym
*elfsym
;
3805 asection
*input_sec
;
3807 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
3808 struct bfd_link_info
*info
,
3813 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
3814 elf_backend_link_output_symbol_hook
;
3815 if (output_symbol_hook
!= NULL
)
3817 if (! ((*output_symbol_hook
)
3818 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
3822 if (name
== (const char *) NULL
|| *name
== '\0')
3823 elfsym
->st_name
= 0;
3826 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
3829 if (elfsym
->st_name
== (unsigned long) -1)
3833 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
3835 if (! elf_link_flush_output_syms (finfo
))
3839 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
3840 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
3841 ++finfo
->symbuf_count
;
3843 ++finfo
->output_bfd
->symcount
;
3848 /* Flush the output symbols to the file. */
3851 elf_link_flush_output_syms (finfo
)
3852 struct elf_final_link_info
*finfo
;
3854 if (finfo
->symbuf_count
> 0)
3856 Elf_Internal_Shdr
*symtab
;
3858 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
3860 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
3862 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
3863 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
3864 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
3867 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
3869 finfo
->symbuf_count
= 0;
3875 /* Add an external symbol to the symbol table. This is called from
3876 the hash table traversal routine. When generating a shared object,
3877 we go through the symbol table twice. The first time we output
3878 anything that might have been forced to local scope in a version
3879 script. The second time we output the symbols that are still
3883 elf_link_output_extsym (h
, data
)
3884 struct elf_link_hash_entry
*h
;
3887 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
3888 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
3890 Elf_Internal_Sym sym
;
3891 asection
*input_sec
;
3893 /* Decide whether to output this symbol in this pass. */
3894 if (eoinfo
->localsyms
)
3896 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3901 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
3905 /* If we are not creating a shared library, and this symbol is
3906 referenced by a shared library but is not defined anywhere, then
3907 warn that it is undefined. If we do not do this, the runtime
3908 linker will complain that the symbol is undefined when the
3909 program is run. We don't have to worry about symbols that are
3910 referenced by regular files, because we will already have issued
3911 warnings for them. */
3912 if (! finfo
->info
->relocateable
3913 && ! finfo
->info
->shared
3914 && h
->root
.type
== bfd_link_hash_undefined
3915 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
3916 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
3918 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
3919 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
3920 (asection
*) NULL
, 0)))
3922 eoinfo
->failed
= true;
3927 /* We don't want to output symbols that have never been mentioned by
3928 a regular file, or that we have been told to strip. However, if
3929 h->indx is set to -2, the symbol is used by a reloc and we must
3933 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3934 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
3935 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3936 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
3938 else if (finfo
->info
->strip
== strip_all
3939 || (finfo
->info
->strip
== strip_some
3940 && bfd_hash_lookup (finfo
->info
->keep_hash
,
3941 h
->root
.root
.string
,
3942 false, false) == NULL
))
3947 /* If we're stripping it, and it's not a dynamic symbol, there's
3948 nothing else to do. */
3949 if (strip
&& h
->dynindx
== -1)
3953 sym
.st_size
= h
->size
;
3954 sym
.st_other
= h
->other
;
3955 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
3956 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
3957 else if (h
->root
.type
== bfd_link_hash_undefweak
3958 || h
->root
.type
== bfd_link_hash_defweak
)
3959 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
3961 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
3963 switch (h
->root
.type
)
3966 case bfd_link_hash_new
:
3970 case bfd_link_hash_undefined
:
3971 input_sec
= bfd_und_section_ptr
;
3972 sym
.st_shndx
= SHN_UNDEF
;
3975 case bfd_link_hash_undefweak
:
3976 input_sec
= bfd_und_section_ptr
;
3977 sym
.st_shndx
= SHN_UNDEF
;
3980 case bfd_link_hash_defined
:
3981 case bfd_link_hash_defweak
:
3983 input_sec
= h
->root
.u
.def
.section
;
3984 if (input_sec
->output_section
!= NULL
)
3987 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
3988 input_sec
->output_section
);
3989 if (sym
.st_shndx
== (unsigned short) -1)
3991 eoinfo
->failed
= true;
3995 /* ELF symbols in relocateable files are section relative,
3996 but in nonrelocateable files they are virtual
3998 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
3999 if (! finfo
->info
->relocateable
)
4000 sym
.st_value
+= input_sec
->output_section
->vma
;
4004 BFD_ASSERT (input_sec
->owner
== NULL
4005 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4006 sym
.st_shndx
= SHN_UNDEF
;
4007 input_sec
= bfd_und_section_ptr
;
4012 case bfd_link_hash_common
:
4013 input_sec
= bfd_com_section_ptr
;
4014 sym
.st_shndx
= SHN_COMMON
;
4015 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4018 case bfd_link_hash_indirect
:
4019 /* These symbols are created by symbol versioning. They point
4020 to the decorated version of the name. For example, if the
4021 symbol foo@@GNU_1.2 is the default, which should be used when
4022 foo is used with no version, then we add an indirect symbol
4023 foo which points to foo@@GNU_1.2. We ignore these symbols,
4024 since the indirected symbol is already in the hash table. If
4025 the indirect symbol is non-ELF, fall through and output it. */
4026 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4030 case bfd_link_hash_warning
:
4031 /* We can't represent these symbols in ELF, although a warning
4032 symbol may have come from a .gnu.warning.SYMBOL section. We
4033 just put the target symbol in the hash table. If the target
4034 symbol does not really exist, don't do anything. */
4035 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4037 return (elf_link_output_extsym
4038 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4041 /* If this symbol should be put in the .dynsym section, then put it
4042 there now. We have already know the symbol index. We also fill
4043 in the entry in the .hash section. */
4044 if (h
->dynindx
!= -1
4045 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4047 struct elf_backend_data
*bed
;
4052 bfd_byte
*bucketpos
;
4055 sym
.st_name
= h
->dynstr_index
;
4057 /* Give the processor backend a chance to tweak the symbol
4058 value, and also to finish up anything that needs to be done
4060 bed
= get_elf_backend_data (finfo
->output_bfd
);
4061 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4062 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4064 eoinfo
->failed
= true;
4068 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4069 (PTR
) (((Elf_External_Sym
*)
4070 finfo
->dynsym_sec
->contents
)
4073 /* We didn't include the version string in the dynamic string
4074 table, so we must not consider it in the hash table. */
4075 name
= h
->root
.root
.string
;
4076 p
= strchr (name
, ELF_VER_CHR
);
4081 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4082 strncpy (copy
, name
, p
- name
);
4083 copy
[p
- name
] = '\0';
4087 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4088 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4089 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4090 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4091 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4092 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4093 put_word (finfo
->output_bfd
, chain
,
4094 ((bfd_byte
*) finfo
->hash_sec
->contents
4095 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4098 bfd_release (finfo
->output_bfd
, copy
);
4100 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4102 Elf_Internal_Versym iversym
;
4104 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4106 if (h
->verinfo
.verdef
== NULL
)
4107 iversym
.vs_vers
= 0;
4109 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4113 if (h
->verinfo
.vertree
== NULL
)
4114 iversym
.vs_vers
= 1;
4116 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4119 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4120 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4122 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4123 (((Elf_External_Versym
*)
4124 finfo
->symver_sec
->contents
)
4129 /* If we're stripping it, then it was just a dynamic symbol, and
4130 there's nothing else to do. */
4134 h
->indx
= finfo
->output_bfd
->symcount
;
4136 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4138 eoinfo
->failed
= true;
4145 /* Link an input file into the linker output file. This function
4146 handles all the sections and relocations of the input file at once.
4147 This is so that we only have to read the local symbols once, and
4148 don't have to keep them in memory. */
4151 elf_link_input_bfd (finfo
, input_bfd
)
4152 struct elf_final_link_info
*finfo
;
4155 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4156 bfd
*, asection
*, bfd_byte
*,
4157 Elf_Internal_Rela
*,
4158 Elf_Internal_Sym
*, asection
**));
4160 Elf_Internal_Shdr
*symtab_hdr
;
4163 Elf_External_Sym
*external_syms
;
4164 Elf_External_Sym
*esym
;
4165 Elf_External_Sym
*esymend
;
4166 Elf_Internal_Sym
*isym
;
4168 asection
**ppsection
;
4171 output_bfd
= finfo
->output_bfd
;
4173 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4175 /* If this is a dynamic object, we don't want to do anything here:
4176 we don't want the local symbols, and we don't want the section
4178 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4181 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4182 if (elf_bad_symtab (input_bfd
))
4184 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4189 locsymcount
= symtab_hdr
->sh_info
;
4190 extsymoff
= symtab_hdr
->sh_info
;
4193 /* Read the local symbols. */
4194 if (symtab_hdr
->contents
!= NULL
)
4195 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4196 else if (locsymcount
== 0)
4197 external_syms
= NULL
;
4200 external_syms
= finfo
->external_syms
;
4201 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4202 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4203 locsymcount
, input_bfd
)
4204 != locsymcount
* sizeof (Elf_External_Sym
)))
4208 /* Swap in the local symbols and write out the ones which we know
4209 are going into the output file. */
4210 esym
= external_syms
;
4211 esymend
= esym
+ locsymcount
;
4212 isym
= finfo
->internal_syms
;
4213 pindex
= finfo
->indices
;
4214 ppsection
= finfo
->sections
;
4215 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4219 Elf_Internal_Sym osym
;
4221 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4224 if (elf_bad_symtab (input_bfd
))
4226 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4233 if (isym
->st_shndx
== SHN_UNDEF
)
4234 isec
= bfd_und_section_ptr
;
4235 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4236 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4237 else if (isym
->st_shndx
== SHN_ABS
)
4238 isec
= bfd_abs_section_ptr
;
4239 else if (isym
->st_shndx
== SHN_COMMON
)
4240 isec
= bfd_com_section_ptr
;
4249 /* Don't output the first, undefined, symbol. */
4250 if (esym
== external_syms
)
4253 /* If we are stripping all symbols, we don't want to output this
4255 if (finfo
->info
->strip
== strip_all
)
4258 /* We never output section symbols. Instead, we use the section
4259 symbol of the corresponding section in the output file. */
4260 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4263 /* If we are discarding all local symbols, we don't want to
4264 output this one. If we are generating a relocateable output
4265 file, then some of the local symbols may be required by
4266 relocs; we output them below as we discover that they are
4268 if (finfo
->info
->discard
== discard_all
)
4271 /* If this symbol is defined in a section which we are
4272 discarding, we don't need to keep it, but note that
4273 linker_mark is only reliable for sections that have contents.
4274 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4275 as well as linker_mark. */
4276 if (isym
->st_shndx
> 0
4277 && isym
->st_shndx
< SHN_LORESERVE
4279 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4280 || (! finfo
->info
->relocateable
4281 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4284 /* Get the name of the symbol. */
4285 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4290 /* See if we are discarding symbols with this name. */
4291 if ((finfo
->info
->strip
== strip_some
4292 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4294 || (finfo
->info
->discard
== discard_l
4295 && bfd_is_local_label_name (input_bfd
, name
)))
4298 /* If we get here, we are going to output this symbol. */
4302 /* Adjust the section index for the output file. */
4303 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4304 isec
->output_section
);
4305 if (osym
.st_shndx
== (unsigned short) -1)
4308 *pindex
= output_bfd
->symcount
;
4310 /* ELF symbols in relocateable files are section relative, but
4311 in executable files they are virtual addresses. Note that
4312 this code assumes that all ELF sections have an associated
4313 BFD section with a reasonable value for output_offset; below
4314 we assume that they also have a reasonable value for
4315 output_section. Any special sections must be set up to meet
4316 these requirements. */
4317 osym
.st_value
+= isec
->output_offset
;
4318 if (! finfo
->info
->relocateable
)
4319 osym
.st_value
+= isec
->output_section
->vma
;
4321 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4325 /* Relocate the contents of each section. */
4326 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4330 if (! o
->linker_mark
)
4332 /* This section was omitted from the link. */
4336 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4337 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4340 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4342 /* Section was created by elf_link_create_dynamic_sections
4347 /* Get the contents of the section. They have been cached by a
4348 relaxation routine. Note that o is a section in an input
4349 file, so the contents field will not have been set by any of
4350 the routines which work on output files. */
4351 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4352 contents
= elf_section_data (o
)->this_hdr
.contents
;
4355 contents
= finfo
->contents
;
4356 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4357 (file_ptr
) 0, o
->_raw_size
))
4361 if ((o
->flags
& SEC_RELOC
) != 0)
4363 Elf_Internal_Rela
*internal_relocs
;
4365 /* Get the swapped relocs. */
4366 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4367 (input_bfd
, o
, finfo
->external_relocs
,
4368 finfo
->internal_relocs
, false));
4369 if (internal_relocs
== NULL
4370 && o
->reloc_count
> 0)
4373 /* Relocate the section by invoking a back end routine.
4375 The back end routine is responsible for adjusting the
4376 section contents as necessary, and (if using Rela relocs
4377 and generating a relocateable output file) adjusting the
4378 reloc addend as necessary.
4380 The back end routine does not have to worry about setting
4381 the reloc address or the reloc symbol index.
4383 The back end routine is given a pointer to the swapped in
4384 internal symbols, and can access the hash table entries
4385 for the external symbols via elf_sym_hashes (input_bfd).
4387 When generating relocateable output, the back end routine
4388 must handle STB_LOCAL/STT_SECTION symbols specially. The
4389 output symbol is going to be a section symbol
4390 corresponding to the output section, which will require
4391 the addend to be adjusted. */
4393 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4394 input_bfd
, o
, contents
,
4396 finfo
->internal_syms
,
4400 if (finfo
->info
->relocateable
)
4402 Elf_Internal_Rela
*irela
;
4403 Elf_Internal_Rela
*irelaend
;
4404 struct elf_link_hash_entry
**rel_hash
;
4405 Elf_Internal_Shdr
*input_rel_hdr
;
4406 Elf_Internal_Shdr
*output_rel_hdr
;
4408 /* Adjust the reloc addresses and symbol indices. */
4410 irela
= internal_relocs
;
4411 irelaend
= irela
+ o
->reloc_count
;
4412 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4413 + o
->output_section
->reloc_count
);
4414 for (; irela
< irelaend
; irela
++, rel_hash
++)
4416 unsigned long r_symndx
;
4417 Elf_Internal_Sym
*isym
;
4420 irela
->r_offset
+= o
->output_offset
;
4422 r_symndx
= ELF_R_SYM (irela
->r_info
);
4427 if (r_symndx
>= locsymcount
4428 || (elf_bad_symtab (input_bfd
)
4429 && finfo
->sections
[r_symndx
] == NULL
))
4433 /* This is a reloc against a global symbol. We
4434 have not yet output all the local symbols, so
4435 we do not know the symbol index of any global
4436 symbol. We set the rel_hash entry for this
4437 reloc to point to the global hash table entry
4438 for this symbol. The symbol index is then
4439 set at the end of elf_bfd_final_link. */
4440 indx
= r_symndx
- extsymoff
;
4441 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4443 /* Setting the index to -2 tells
4444 elf_link_output_extsym that this symbol is
4446 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4447 (*rel_hash
)->indx
= -2;
4452 /* This is a reloc against a local symbol. */
4455 isym
= finfo
->internal_syms
+ r_symndx
;
4456 sec
= finfo
->sections
[r_symndx
];
4457 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4459 /* I suppose the backend ought to fill in the
4460 section of any STT_SECTION symbol against a
4461 processor specific section. If we have
4462 discarded a section, the output_section will
4463 be the absolute section. */
4465 && (bfd_is_abs_section (sec
)
4466 || (sec
->output_section
!= NULL
4467 && bfd_is_abs_section (sec
->output_section
))))
4469 else if (sec
== NULL
|| sec
->owner
== NULL
)
4471 bfd_set_error (bfd_error_bad_value
);
4476 r_symndx
= sec
->output_section
->target_index
;
4477 BFD_ASSERT (r_symndx
!= 0);
4482 if (finfo
->indices
[r_symndx
] == -1)
4488 if (finfo
->info
->strip
== strip_all
)
4490 /* You can't do ld -r -s. */
4491 bfd_set_error (bfd_error_invalid_operation
);
4495 /* This symbol was skipped earlier, but
4496 since it is needed by a reloc, we
4497 must output it now. */
4498 link
= symtab_hdr
->sh_link
;
4499 name
= bfd_elf_string_from_elf_section (input_bfd
,
4505 osec
= sec
->output_section
;
4507 _bfd_elf_section_from_bfd_section (output_bfd
,
4509 if (isym
->st_shndx
== (unsigned short) -1)
4512 isym
->st_value
+= sec
->output_offset
;
4513 if (! finfo
->info
->relocateable
)
4514 isym
->st_value
+= osec
->vma
;
4516 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4518 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4522 r_symndx
= finfo
->indices
[r_symndx
];
4525 irela
->r_info
= ELF_R_INFO (r_symndx
,
4526 ELF_R_TYPE (irela
->r_info
));
4529 /* Swap out the relocs. */
4530 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4531 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4532 BFD_ASSERT (output_rel_hdr
->sh_entsize
4533 == input_rel_hdr
->sh_entsize
);
4534 irela
= internal_relocs
;
4535 irelaend
= irela
+ o
->reloc_count
;
4536 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4538 Elf_External_Rel
*erel
;
4540 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4541 + o
->output_section
->reloc_count
);
4542 for (; irela
< irelaend
; irela
++, erel
++)
4544 Elf_Internal_Rel irel
;
4546 irel
.r_offset
= irela
->r_offset
;
4547 irel
.r_info
= irela
->r_info
;
4548 BFD_ASSERT (irela
->r_addend
== 0);
4549 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4554 Elf_External_Rela
*erela
;
4556 BFD_ASSERT (input_rel_hdr
->sh_entsize
4557 == sizeof (Elf_External_Rela
));
4558 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4559 + o
->output_section
->reloc_count
);
4560 for (; irela
< irelaend
; irela
++, erela
++)
4561 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4564 o
->output_section
->reloc_count
+= o
->reloc_count
;
4568 /* Write out the modified section contents. */
4569 if (elf_section_data (o
)->stab_info
== NULL
)
4571 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4572 contents
, o
->output_offset
,
4573 (o
->_cooked_size
!= 0
4580 if (! (_bfd_write_section_stabs
4581 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4582 o
, &elf_section_data (o
)->stab_info
, contents
)))
4590 /* Generate a reloc when linking an ELF file. This is a reloc
4591 requested by the linker, and does come from any input file. This
4592 is used to build constructor and destructor tables when linking
4596 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4598 struct bfd_link_info
*info
;
4599 asection
*output_section
;
4600 struct bfd_link_order
*link_order
;
4602 reloc_howto_type
*howto
;
4606 struct elf_link_hash_entry
**rel_hash_ptr
;
4607 Elf_Internal_Shdr
*rel_hdr
;
4609 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4612 bfd_set_error (bfd_error_bad_value
);
4616 addend
= link_order
->u
.reloc
.p
->addend
;
4618 /* Figure out the symbol index. */
4619 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4620 + output_section
->reloc_count
);
4621 if (link_order
->type
== bfd_section_reloc_link_order
)
4623 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4624 BFD_ASSERT (indx
!= 0);
4625 *rel_hash_ptr
= NULL
;
4629 struct elf_link_hash_entry
*h
;
4631 /* Treat a reloc against a defined symbol as though it were
4632 actually against the section. */
4633 h
= ((struct elf_link_hash_entry
*)
4634 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4635 link_order
->u
.reloc
.p
->u
.name
,
4636 false, false, true));
4638 && (h
->root
.type
== bfd_link_hash_defined
4639 || h
->root
.type
== bfd_link_hash_defweak
))
4643 section
= h
->root
.u
.def
.section
;
4644 indx
= section
->output_section
->target_index
;
4645 *rel_hash_ptr
= NULL
;
4646 /* It seems that we ought to add the symbol value to the
4647 addend here, but in practice it has already been added
4648 because it was passed to constructor_callback. */
4649 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4653 /* Setting the index to -2 tells elf_link_output_extsym that
4654 this symbol is used by a reloc. */
4661 if (! ((*info
->callbacks
->unattached_reloc
)
4662 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4663 (asection
*) NULL
, (bfd_vma
) 0)))
4669 /* If this is an inplace reloc, we must write the addend into the
4671 if (howto
->partial_inplace
&& addend
!= 0)
4674 bfd_reloc_status_type rstat
;
4678 size
= bfd_get_reloc_size (howto
);
4679 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4680 if (buf
== (bfd_byte
*) NULL
)
4682 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4688 case bfd_reloc_outofrange
:
4690 case bfd_reloc_overflow
:
4691 if (! ((*info
->callbacks
->reloc_overflow
)
4693 (link_order
->type
== bfd_section_reloc_link_order
4694 ? bfd_section_name (output_bfd
,
4695 link_order
->u
.reloc
.p
->u
.section
)
4696 : link_order
->u
.reloc
.p
->u
.name
),
4697 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
4705 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
4706 (file_ptr
) link_order
->offset
, size
);
4712 /* The address of a reloc is relative to the section in a
4713 relocateable file, and is a virtual address in an executable
4715 offset
= link_order
->offset
;
4716 if (! info
->relocateable
)
4717 offset
+= output_section
->vma
;
4719 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4721 if (rel_hdr
->sh_type
== SHT_REL
)
4723 Elf_Internal_Rel irel
;
4724 Elf_External_Rel
*erel
;
4726 irel
.r_offset
= offset
;
4727 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4728 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
4729 + output_section
->reloc_count
);
4730 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4734 Elf_Internal_Rela irela
;
4735 Elf_External_Rela
*erela
;
4737 irela
.r_offset
= offset
;
4738 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4739 irela
.r_addend
= addend
;
4740 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
4741 + output_section
->reloc_count
);
4742 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
4745 ++output_section
->reloc_count
;
4751 /* Allocate a pointer to live in a linker created section. */
4754 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
4756 struct bfd_link_info
*info
;
4757 elf_linker_section_t
*lsect
;
4758 struct elf_link_hash_entry
*h
;
4759 const Elf_Internal_Rela
*rel
;
4761 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
4762 elf_linker_section_pointers_t
*linker_section_ptr
;
4763 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
4765 BFD_ASSERT (lsect
!= NULL
);
4767 /* Is this a global symbol? */
4770 /* Has this symbol already been allocated, if so, our work is done */
4771 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
4776 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
4777 /* Make sure this symbol is output as a dynamic symbol. */
4778 if (h
->dynindx
== -1)
4780 if (! elf_link_record_dynamic_symbol (info
, h
))
4784 if (lsect
->rel_section
)
4785 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
4788 else /* Allocation of a pointer to a local symbol */
4790 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
4792 /* Allocate a table to hold the local symbols if first time */
4795 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
4796 register unsigned int i
;
4798 ptr
= (elf_linker_section_pointers_t
**)
4799 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
4804 elf_local_ptr_offsets (abfd
) = ptr
;
4805 for (i
= 0; i
< num_symbols
; i
++)
4806 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
4809 /* Has this symbol already been allocated, if so, our work is done */
4810 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
4815 ptr_linker_section_ptr
= &ptr
[r_symndx
];
4819 /* If we are generating a shared object, we need to
4820 output a R_<xxx>_RELATIVE reloc so that the
4821 dynamic linker can adjust this GOT entry. */
4822 BFD_ASSERT (lsect
->rel_section
!= NULL
);
4823 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
4827 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
4828 from internal memory. */
4829 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
4830 linker_section_ptr
= (elf_linker_section_pointers_t
*)
4831 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
4833 if (!linker_section_ptr
)
4836 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
4837 linker_section_ptr
->addend
= rel
->r_addend
;
4838 linker_section_ptr
->which
= lsect
->which
;
4839 linker_section_ptr
->written_address_p
= false;
4840 *ptr_linker_section_ptr
= linker_section_ptr
;
4843 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
4845 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
4846 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
4847 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
4848 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
4850 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
4852 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
4853 lsect
->sym_hash
->root
.root
.string
,
4854 (long)ARCH_SIZE
/ 8,
4855 (long)lsect
->sym_hash
->root
.u
.def
.value
);
4861 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
4863 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
4866 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
4867 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
4875 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
4878 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
4881 /* Fill in the address for a pointer generated in alinker section. */
4884 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
4887 struct bfd_link_info
*info
;
4888 elf_linker_section_t
*lsect
;
4889 struct elf_link_hash_entry
*h
;
4891 const Elf_Internal_Rela
*rel
;
4894 elf_linker_section_pointers_t
*linker_section_ptr
;
4896 BFD_ASSERT (lsect
!= NULL
);
4898 if (h
!= NULL
) /* global symbol */
4900 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
4904 BFD_ASSERT (linker_section_ptr
!= NULL
);
4906 if (! elf_hash_table (info
)->dynamic_sections_created
4909 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
4911 /* This is actually a static link, or it is a
4912 -Bsymbolic link and the symbol is defined
4913 locally. We must initialize this entry in the
4916 When doing a dynamic link, we create a .rela.<xxx>
4917 relocation entry to initialize the value. This
4918 is done in the finish_dynamic_symbol routine. */
4919 if (!linker_section_ptr
->written_address_p
)
4921 linker_section_ptr
->written_address_p
= true;
4922 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
4923 lsect
->section
->contents
+ linker_section_ptr
->offset
);
4927 else /* local symbol */
4929 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
4930 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
4931 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
4932 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
4936 BFD_ASSERT (linker_section_ptr
!= NULL
);
4938 /* Write out pointer if it hasn't been rewritten out before */
4939 if (!linker_section_ptr
->written_address_p
)
4941 linker_section_ptr
->written_address_p
= true;
4942 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
4943 lsect
->section
->contents
+ linker_section_ptr
->offset
);
4947 asection
*srel
= lsect
->rel_section
;
4948 Elf_Internal_Rela outrel
;
4950 /* We need to generate a relative reloc for the dynamic linker. */
4952 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
4955 BFD_ASSERT (srel
!= NULL
);
4957 outrel
.r_offset
= (lsect
->section
->output_section
->vma
4958 + lsect
->section
->output_offset
4959 + linker_section_ptr
->offset
);
4960 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
4961 outrel
.r_addend
= 0;
4962 elf_swap_reloca_out (output_bfd
, &outrel
,
4963 (((Elf_External_Rela
*)
4964 lsect
->section
->contents
)
4965 + lsect
->section
->reloc_count
));
4966 ++lsect
->section
->reloc_count
;
4971 relocation
= (lsect
->section
->output_offset
4972 + linker_section_ptr
->offset
4973 - lsect
->hole_offset
4974 - lsect
->sym_offset
);
4977 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
4978 lsect
->name
, (long)relocation
, (long)relocation
);
4981 /* Subtract out the addend, because it will get added back in by the normal
4983 return relocation
- linker_section_ptr
->addend
;