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 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info
*info
;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd
*, struct bfd_link_info
*));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd
*, struct bfd_link_info
*));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
37 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
38 boolean
*, boolean
*, boolean
*));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry
*, PTR
));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry
*, PTR
));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry
*, PTR
));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry
*, PTR
));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry
*, PTR
));
51 static boolean elf_link_renumber_dynsyms
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
54 /* Given an ELF BFD, add symbols to the global hash table as
58 elf_bfd_link_add_symbols (abfd
, info
)
60 struct bfd_link_info
*info
;
62 switch (bfd_get_format (abfd
))
65 return elf_link_add_object_symbols (abfd
, info
);
67 return elf_link_add_archive_symbols (abfd
, info
);
69 bfd_set_error (bfd_error_wrong_format
);
75 /* Add symbols from an ELF archive file to the linker hash table. We
76 don't use _bfd_generic_link_add_archive_symbols because of a
77 problem which arises on UnixWare. The UnixWare libc.so is an
78 archive which includes an entry libc.so.1 which defines a bunch of
79 symbols. The libc.so archive also includes a number of other
80 object files, which also define symbols, some of which are the same
81 as those defined in libc.so.1. Correct linking requires that we
82 consider each object file in turn, and include it if it defines any
83 symbols we need. _bfd_generic_link_add_archive_symbols does not do
84 this; it looks through the list of undefined symbols, and includes
85 any object file which defines them. When this algorithm is used on
86 UnixWare, it winds up pulling in libc.so.1 early and defining a
87 bunch of symbols. This means that some of the other objects in the
88 archive are not included in the link, which is incorrect since they
89 precede libc.so.1 in the archive.
91 Fortunately, ELF archive handling is simpler than that done by
92 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
93 oddities. In ELF, if we find a symbol in the archive map, and the
94 symbol is currently undefined, we know that we must pull in that
97 Unfortunately, we do have to make multiple passes over the symbol
98 table until nothing further is resolved. */
101 elf_link_add_archive_symbols (abfd
, info
)
103 struct bfd_link_info
*info
;
106 boolean
*defined
= NULL
;
107 boolean
*included
= NULL
;
111 if (! bfd_has_map (abfd
))
113 /* An empty archive is a special case. */
114 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
116 bfd_set_error (bfd_error_no_armap
);
120 /* Keep track of all symbols we know to be already defined, and all
121 files we know to be already included. This is to speed up the
122 second and subsequent passes. */
123 c
= bfd_ardata (abfd
)->symdef_count
;
126 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
127 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
128 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
130 memset (defined
, 0, c
* sizeof (boolean
));
131 memset (included
, 0, c
* sizeof (boolean
));
133 symdefs
= bfd_ardata (abfd
)->symdefs
;
146 symdefend
= symdef
+ c
;
147 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
149 struct elf_link_hash_entry
*h
;
151 struct bfd_link_hash_entry
*undefs_tail
;
154 if (defined
[i
] || included
[i
])
156 if (symdef
->file_offset
== last
)
162 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
163 false, false, false);
169 /* If this is a default version (the name contains @@),
170 look up the symbol again without the version. The
171 effect is that references to the symbol without the
172 version will be matched by the default symbol in the
175 p
= strchr (symdef
->name
, ELF_VER_CHR
);
176 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
179 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
182 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
183 copy
[p
- symdef
->name
] = '\0';
185 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
186 false, false, false);
188 bfd_release (abfd
, copy
);
194 if (h
->root
.type
!= bfd_link_hash_undefined
)
196 if (h
->root
.type
!= bfd_link_hash_undefweak
)
201 /* We need to include this archive member. */
203 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
204 if (element
== (bfd
*) NULL
)
207 if (! bfd_check_format (element
, bfd_object
))
210 /* Doublecheck that we have not included this object
211 already--it should be impossible, but there may be
212 something wrong with the archive. */
213 if (element
->archive_pass
!= 0)
215 bfd_set_error (bfd_error_bad_value
);
218 element
->archive_pass
= 1;
220 undefs_tail
= info
->hash
->undefs_tail
;
222 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
225 if (! elf_link_add_object_symbols (element
, info
))
228 /* If there are any new undefined symbols, we need to make
229 another pass through the archive in order to see whether
230 they can be defined. FIXME: This isn't perfect, because
231 common symbols wind up on undefs_tail and because an
232 undefined symbol which is defined later on in this pass
233 does not require another pass. This isn't a bug, but it
234 does make the code less efficient than it could be. */
235 if (undefs_tail
!= info
->hash
->undefs_tail
)
238 /* Look backward to mark all symbols from this object file
239 which we have already seen in this pass. */
243 included
[mark
] = true;
248 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
250 /* We mark subsequent symbols from this object file as we go
251 on through the loop. */
252 last
= symdef
->file_offset
;
263 if (defined
!= (boolean
*) NULL
)
265 if (included
!= (boolean
*) NULL
)
270 /* This function is called when we want to define a new symbol. It
271 handles the various cases which arise when we find a definition in
272 a dynamic object, or when there is already a definition in a
273 dynamic object. The new symbol is described by NAME, SYM, PSEC,
274 and PVALUE. We set SYM_HASH to the hash table entry. We set
275 OVERRIDE if the old symbol is overriding a new definition. We set
276 TYPE_CHANGE_OK if it is OK for the type to change. We set
277 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
278 change, we mean that we shouldn't warn if the type or size does
282 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
283 override
, type_change_ok
, size_change_ok
)
285 struct bfd_link_info
*info
;
287 Elf_Internal_Sym
*sym
;
290 struct elf_link_hash_entry
**sym_hash
;
292 boolean
*type_change_ok
;
293 boolean
*size_change_ok
;
296 struct elf_link_hash_entry
*h
;
299 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
301 /* This code is for coping with dynamic objects, and is only useful
302 if we are doing an ELF link. */
303 if (info
->hash
->creator
!= abfd
->xvec
)
307 *type_change_ok
= false;
308 *size_change_ok
= false;
311 bind
= ELF_ST_BIND (sym
->st_info
);
313 if (! bfd_is_und_section (sec
))
314 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
316 h
= ((struct elf_link_hash_entry
*)
317 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
322 /* For merging, we only care about real symbols. */
324 while (h
->root
.type
== bfd_link_hash_indirect
325 || h
->root
.type
== bfd_link_hash_warning
)
326 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
328 /* If we just created the symbol, mark it as being an ELF symbol.
329 Other than that, there is nothing to do--there is no merge issue
330 with a newly defined symbol--so we just return. */
332 if (h
->root
.type
== bfd_link_hash_new
)
334 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
338 /* OLDBFD is a BFD associated with the existing symbol. */
340 switch (h
->root
.type
)
346 case bfd_link_hash_undefined
:
347 case bfd_link_hash_undefweak
:
348 oldbfd
= h
->root
.u
.undef
.abfd
;
351 case bfd_link_hash_defined
:
352 case bfd_link_hash_defweak
:
353 oldbfd
= h
->root
.u
.def
.section
->owner
;
356 case bfd_link_hash_common
:
357 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
361 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
362 respectively, is from a dynamic object. */
364 if ((abfd
->flags
& DYNAMIC
) != 0)
369 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
374 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
375 respectively, appear to be a definition rather than reference. */
377 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
382 if (h
->root
.type
== bfd_link_hash_undefined
383 || h
->root
.type
== bfd_link_hash_undefweak
384 || h
->root
.type
== bfd_link_hash_common
)
389 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
390 symbol, respectively, appears to be a common symbol in a dynamic
391 object. If a symbol appears in an uninitialized section, and is
392 not weak, and is not a function, then it may be a common symbol
393 which was resolved when the dynamic object was created. We want
394 to treat such symbols specially, because they raise special
395 considerations when setting the symbol size: if the symbol
396 appears as a common symbol in a regular object, and the size in
397 the regular object is larger, we must make sure that we use the
398 larger size. This problematic case can always be avoided in C,
399 but it must be handled correctly when using Fortran shared
402 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
403 likewise for OLDDYNCOMMON and OLDDEF.
405 Note that this test is just a heuristic, and that it is quite
406 possible to have an uninitialized symbol in a shared object which
407 is really a definition, rather than a common symbol. This could
408 lead to some minor confusion when the symbol really is a common
409 symbol in some regular object. However, I think it will be
414 && (sec
->flags
& SEC_ALLOC
) != 0
415 && (sec
->flags
& SEC_LOAD
) == 0
418 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
421 newdyncommon
= false;
425 && h
->root
.type
== bfd_link_hash_defined
426 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
427 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
428 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
430 && h
->type
!= STT_FUNC
)
433 olddyncommon
= false;
435 /* It's OK to change the type if either the existing symbol or the
436 new symbol is weak. */
438 if (h
->root
.type
== bfd_link_hash_defweak
439 || h
->root
.type
== bfd_link_hash_undefweak
441 *type_change_ok
= true;
443 /* It's OK to change the size if either the existing symbol or the
444 new symbol is weak, or if the old symbol is undefined. */
447 || h
->root
.type
== bfd_link_hash_undefined
)
448 *size_change_ok
= true;
450 /* If both the old and the new symbols look like common symbols in a
451 dynamic object, set the size of the symbol to the larger of the
456 && sym
->st_size
!= h
->size
)
458 /* Since we think we have two common symbols, issue a multiple
459 common warning if desired. Note that we only warn if the
460 size is different. If the size is the same, we simply let
461 the old symbol override the new one as normally happens with
462 symbols defined in dynamic objects. */
464 if (! ((*info
->callbacks
->multiple_common
)
465 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
466 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
469 if (sym
->st_size
> h
->size
)
470 h
->size
= sym
->st_size
;
472 *size_change_ok
= true;
475 /* If we are looking at a dynamic object, and we have found a
476 definition, we need to see if the symbol was already defined by
477 some other object. If so, we want to use the existing
478 definition, and we do not want to report a multiple symbol
479 definition error; we do this by clobbering *PSEC to be
482 We treat a common symbol as a definition if the symbol in the
483 shared library is a function, since common symbols always
484 represent variables; this can cause confusion in principle, but
485 any such confusion would seem to indicate an erroneous program or
486 shared library. We also permit a common symbol in a regular
487 object to override a weak symbol in a shared object. */
492 || (h
->root
.type
== bfd_link_hash_common
494 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
498 newdyncommon
= false;
500 *psec
= sec
= bfd_und_section_ptr
;
501 *size_change_ok
= true;
503 /* If we get here when the old symbol is a common symbol, then
504 we are explicitly letting it override a weak symbol or
505 function in a dynamic object, and we don't want to warn about
506 a type change. If the old symbol is a defined symbol, a type
507 change warning may still be appropriate. */
509 if (h
->root
.type
== bfd_link_hash_common
)
510 *type_change_ok
= true;
513 /* Handle the special case of an old common symbol merging with a
514 new symbol which looks like a common symbol in a shared object.
515 We change *PSEC and *PVALUE to make the new symbol look like a
516 common symbol, and let _bfd_generic_link_add_one_symbol will do
520 && h
->root
.type
== bfd_link_hash_common
)
524 newdyncommon
= false;
525 *pvalue
= sym
->st_size
;
526 *psec
= sec
= bfd_com_section_ptr
;
527 *size_change_ok
= true;
530 /* If the old symbol is from a dynamic object, and the new symbol is
531 a definition which is not from a dynamic object, then the new
532 symbol overrides the old symbol. Symbols from regular files
533 always take precedence over symbols from dynamic objects, even if
534 they are defined after the dynamic object in the link.
536 As above, we again permit a common symbol in a regular object to
537 override a definition in a shared object if the shared object
538 symbol is a function or is weak. */
542 || (bfd_is_com_section (sec
)
543 && (h
->root
.type
== bfd_link_hash_defweak
544 || h
->type
== STT_FUNC
)))
547 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
549 /* Change the hash table entry to undefined, and let
550 _bfd_generic_link_add_one_symbol do the right thing with the
553 h
->root
.type
= bfd_link_hash_undefined
;
554 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
555 *size_change_ok
= true;
558 olddyncommon
= false;
560 /* We again permit a type change when a common symbol may be
561 overriding a function. */
563 if (bfd_is_com_section (sec
))
564 *type_change_ok
= true;
566 /* This union may have been set to be non-NULL when this symbol
567 was seen in a dynamic object. We must force the union to be
568 NULL, so that it is correct for a regular symbol. */
570 h
->verinfo
.vertree
= NULL
;
572 /* In this special case, if H is the target of an indirection,
573 we want the caller to frob with H rather than with the
574 indirect symbol. That will permit the caller to redefine the
575 target of the indirection, rather than the indirect symbol
576 itself. FIXME: This will break the -y option if we store a
577 symbol with a different name. */
581 /* Handle the special case of a new common symbol merging with an
582 old symbol that looks like it might be a common symbol defined in
583 a shared object. Note that we have already handled the case in
584 which a new common symbol should simply override the definition
585 in the shared library. */
588 && bfd_is_com_section (sec
)
591 /* It would be best if we could set the hash table entry to a
592 common symbol, but we don't know what to use for the section
594 if (! ((*info
->callbacks
->multiple_common
)
595 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
596 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
599 /* If the predumed common symbol in the dynamic object is
600 larger, pretend that the new symbol has its size. */
602 if (h
->size
> *pvalue
)
605 /* FIXME: We no longer know the alignment required by the symbol
606 in the dynamic object, so we just wind up using the one from
607 the regular object. */
610 olddyncommon
= false;
612 h
->root
.type
= bfd_link_hash_undefined
;
613 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
615 *size_change_ok
= true;
616 *type_change_ok
= true;
618 h
->verinfo
.vertree
= NULL
;
624 /* Add symbols from an ELF object file to the linker hash table. */
627 elf_link_add_object_symbols (abfd
, info
)
629 struct bfd_link_info
*info
;
631 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
632 const Elf_Internal_Sym
*,
633 const char **, flagword
*,
634 asection
**, bfd_vma
*));
635 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
636 asection
*, const Elf_Internal_Rela
*));
638 Elf_Internal_Shdr
*hdr
;
642 Elf_External_Sym
*buf
= NULL
;
643 struct elf_link_hash_entry
**sym_hash
;
645 bfd_byte
*dynver
= NULL
;
646 Elf_External_Versym
*extversym
= NULL
;
647 Elf_External_Versym
*ever
;
648 Elf_External_Dyn
*dynbuf
= NULL
;
649 struct elf_link_hash_entry
*weaks
;
650 Elf_External_Sym
*esym
;
651 Elf_External_Sym
*esymend
;
653 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
654 collect
= get_elf_backend_data (abfd
)->collect
;
656 if ((abfd
->flags
& DYNAMIC
) == 0)
662 /* You can't use -r against a dynamic object. Also, there's no
663 hope of using a dynamic object which does not exactly match
664 the format of the output file. */
665 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
667 bfd_set_error (bfd_error_invalid_operation
);
672 /* As a GNU extension, any input sections which are named
673 .gnu.warning.SYMBOL are treated as warning symbols for the given
674 symbol. This differs from .gnu.warning sections, which generate
675 warnings when they are included in an output file. */
680 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
684 name
= bfd_get_section_name (abfd
, s
);
685 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
690 name
+= sizeof ".gnu.warning." - 1;
692 /* If this is a shared object, then look up the symbol
693 in the hash table. If it is there, and it is already
694 been defined, then we will not be using the entry
695 from this shared object, so we don't need to warn.
696 FIXME: If we see the definition in a regular object
697 later on, we will warn, but we shouldn't. The only
698 fix is to keep track of what warnings we are supposed
699 to emit, and then handle them all at the end of the
701 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
703 struct elf_link_hash_entry
*h
;
705 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
708 /* FIXME: What about bfd_link_hash_common? */
710 && (h
->root
.type
== bfd_link_hash_defined
711 || h
->root
.type
== bfd_link_hash_defweak
))
713 /* We don't want to issue this warning. Clobber
714 the section size so that the warning does not
715 get copied into the output file. */
721 sz
= bfd_section_size (abfd
, s
);
722 msg
= (char *) bfd_alloc (abfd
, sz
);
726 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
729 if (! (_bfd_generic_link_add_one_symbol
730 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
731 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
734 if (! info
->relocateable
)
736 /* Clobber the section size so that the warning does
737 not get copied into the output file. */
744 /* If this is a dynamic object, we always link against the .dynsym
745 symbol table, not the .symtab symbol table. The dynamic linker
746 will only see the .dynsym symbol table, so there is no reason to
747 look at .symtab for a dynamic object. */
749 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
750 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
752 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
756 /* Read in any version definitions. */
758 if (! _bfd_elf_slurp_version_tables (abfd
))
761 /* Read in the symbol versions, but don't bother to convert them
762 to internal format. */
763 if (elf_dynversym (abfd
) != 0)
765 Elf_Internal_Shdr
*versymhdr
;
767 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
768 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
769 if (extversym
== NULL
)
771 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
772 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
773 != versymhdr
->sh_size
))
778 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
780 /* The sh_info field of the symtab header tells us where the
781 external symbols start. We don't care about the local symbols at
783 if (elf_bad_symtab (abfd
))
785 extsymcount
= symcount
;
790 extsymcount
= symcount
- hdr
->sh_info
;
791 extsymoff
= hdr
->sh_info
;
794 buf
= ((Elf_External_Sym
*)
795 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
796 if (buf
== NULL
&& extsymcount
!= 0)
799 /* We store a pointer to the hash table entry for each external
801 sym_hash
= ((struct elf_link_hash_entry
**)
803 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
804 if (sym_hash
== NULL
)
806 elf_sym_hashes (abfd
) = sym_hash
;
810 /* If we are creating a shared library, create all the dynamic
811 sections immediately. We need to attach them to something,
812 so we attach them to this BFD, provided it is the right
813 format. FIXME: If there are no input BFD's of the same
814 format as the output, we can't make a shared library. */
816 && ! elf_hash_table (info
)->dynamic_sections_created
817 && abfd
->xvec
== info
->hash
->creator
)
819 if (! elf_link_create_dynamic_sections (abfd
, info
))
828 bfd_size_type oldsize
;
829 bfd_size_type strindex
;
831 /* Find the name to use in a DT_NEEDED entry that refers to this
832 object. If the object has a DT_SONAME entry, we use it.
833 Otherwise, if the generic linker stuck something in
834 elf_dt_name, we use that. Otherwise, we just use the file
835 name. If the generic linker put a null string into
836 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
837 there is a DT_SONAME entry. */
839 name
= bfd_get_filename (abfd
);
840 if (elf_dt_name (abfd
) != NULL
)
842 name
= elf_dt_name (abfd
);
846 s
= bfd_get_section_by_name (abfd
, ".dynamic");
849 Elf_External_Dyn
*extdyn
;
850 Elf_External_Dyn
*extdynend
;
854 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
858 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
859 (file_ptr
) 0, s
->_raw_size
))
862 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
865 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
868 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
869 for (; extdyn
< extdynend
; extdyn
++)
871 Elf_Internal_Dyn dyn
;
873 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
874 if (dyn
.d_tag
== DT_SONAME
)
876 name
= bfd_elf_string_from_elf_section (abfd
, link
,
881 if (dyn
.d_tag
== DT_NEEDED
)
883 struct bfd_link_needed_list
*n
, **pn
;
886 n
= ((struct bfd_link_needed_list
*)
887 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
888 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
890 if (n
== NULL
|| fnm
== NULL
)
892 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
899 for (pn
= &elf_hash_table (info
)->needed
;
911 /* We do not want to include any of the sections in a dynamic
912 object in the output file. We hack by simply clobbering the
913 list of sections in the BFD. This could be handled more
914 cleanly by, say, a new section flag; the existing
915 SEC_NEVER_LOAD flag is not the one we want, because that one
916 still implies that the section takes up space in the output
918 abfd
->sections
= NULL
;
919 abfd
->section_count
= 0;
921 /* If this is the first dynamic object found in the link, create
922 the special sections required for dynamic linking. */
923 if (! elf_hash_table (info
)->dynamic_sections_created
)
925 if (! elf_link_create_dynamic_sections (abfd
, info
))
931 /* Add a DT_NEEDED entry for this dynamic object. */
932 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
933 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
935 if (strindex
== (bfd_size_type
) -1)
938 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
941 Elf_External_Dyn
*dyncon
, *dynconend
;
943 /* The hash table size did not change, which means that
944 the dynamic object name was already entered. If we
945 have already included this dynamic object in the
946 link, just ignore it. There is no reason to include
947 a particular dynamic object more than once. */
948 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
950 BFD_ASSERT (sdyn
!= NULL
);
952 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
953 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
955 for (; dyncon
< dynconend
; dyncon
++)
957 Elf_Internal_Dyn dyn
;
959 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
961 if (dyn
.d_tag
== DT_NEEDED
962 && dyn
.d_un
.d_val
== strindex
)
966 if (extversym
!= NULL
)
973 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
977 /* Save the SONAME, if there is one, because sometimes the
978 linker emulation code will need to know it. */
980 name
= bfd_get_filename (abfd
);
981 elf_dt_name (abfd
) = name
;
985 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
987 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
988 != extsymcount
* sizeof (Elf_External_Sym
)))
993 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
994 esymend
= buf
+ extsymcount
;
997 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
999 Elf_Internal_Sym sym
;
1005 struct elf_link_hash_entry
*h
;
1007 boolean size_change_ok
, type_change_ok
;
1008 boolean new_weakdef
;
1009 unsigned int old_alignment
;
1011 elf_swap_symbol_in (abfd
, esym
, &sym
);
1013 flags
= BSF_NO_FLAGS
;
1015 value
= sym
.st_value
;
1018 bind
= ELF_ST_BIND (sym
.st_info
);
1019 if (bind
== STB_LOCAL
)
1021 /* This should be impossible, since ELF requires that all
1022 global symbols follow all local symbols, and that sh_info
1023 point to the first global symbol. Unfortunatealy, Irix 5
1027 else if (bind
== STB_GLOBAL
)
1029 if (sym
.st_shndx
!= SHN_UNDEF
1030 && sym
.st_shndx
!= SHN_COMMON
)
1035 else if (bind
== STB_WEAK
)
1039 /* Leave it up to the processor backend. */
1042 if (sym
.st_shndx
== SHN_UNDEF
)
1043 sec
= bfd_und_section_ptr
;
1044 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1046 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1048 sec
= bfd_abs_section_ptr
;
1049 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1052 else if (sym
.st_shndx
== SHN_ABS
)
1053 sec
= bfd_abs_section_ptr
;
1054 else if (sym
.st_shndx
== SHN_COMMON
)
1056 sec
= bfd_com_section_ptr
;
1057 /* What ELF calls the size we call the value. What ELF
1058 calls the value we call the alignment. */
1059 value
= sym
.st_size
;
1063 /* Leave it up to the processor backend. */
1066 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1067 if (name
== (const char *) NULL
)
1070 if (add_symbol_hook
)
1072 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1076 /* The hook function sets the name to NULL if this symbol
1077 should be skipped for some reason. */
1078 if (name
== (const char *) NULL
)
1082 /* Sanity check that all possibilities were handled. */
1083 if (sec
== (asection
*) NULL
)
1085 bfd_set_error (bfd_error_bad_value
);
1089 if (bfd_is_und_section (sec
)
1090 || bfd_is_com_section (sec
))
1095 size_change_ok
= false;
1096 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1098 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1100 Elf_Internal_Versym iver
;
1106 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1107 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1109 /* If this is a hidden symbol, or if it is not version
1110 1, we append the version name to the symbol name.
1111 However, we do not modify a non-hidden absolute
1112 symbol, because it might be the version symbol
1113 itself. FIXME: What if it isn't? */
1114 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1115 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1118 int namelen
, newlen
;
1121 if (sym
.st_shndx
!= SHN_UNDEF
)
1123 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1125 (*_bfd_error_handler
)
1126 ("%s: %s: invalid version %d (max %d)",
1127 abfd
->filename
, name
, vernum
,
1128 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1129 bfd_set_error (bfd_error_bad_value
);
1132 else if (vernum
> 1)
1134 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1140 /* We cannot simply test for the number of
1141 entries in the VERNEED section since the
1142 numbers for the needed versions do not start
1144 Elf_Internal_Verneed
*t
;
1147 for (t
= elf_tdata (abfd
)->verref
;
1151 Elf_Internal_Vernaux
*a
;
1153 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1155 if (a
->vna_other
== vernum
)
1157 verstr
= a
->vna_nodename
;
1166 (*_bfd_error_handler
)
1167 ("%s: %s: invalid needed version %d",
1168 abfd
->filename
, name
, vernum
);
1169 bfd_set_error (bfd_error_bad_value
);
1174 namelen
= strlen (name
);
1175 newlen
= namelen
+ strlen (verstr
) + 2;
1176 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1179 newname
= (char *) bfd_alloc (abfd
, newlen
);
1180 if (newname
== NULL
)
1182 strcpy (newname
, name
);
1183 p
= newname
+ namelen
;
1185 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1193 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1194 sym_hash
, &override
, &type_change_ok
,
1202 while (h
->root
.type
== bfd_link_hash_indirect
1203 || h
->root
.type
== bfd_link_hash_warning
)
1204 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1206 /* Remember the old alignment if this is a common symbol, so
1207 that we don't reduce the alignment later on. We can't
1208 check later, because _bfd_generic_link_add_one_symbol
1209 will set a default for the alignment which we want to
1211 if (h
->root
.type
== bfd_link_hash_common
)
1212 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1214 if (elf_tdata (abfd
)->verdef
!= NULL
1218 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1221 if (! (_bfd_generic_link_add_one_symbol
1222 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1223 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1227 while (h
->root
.type
== bfd_link_hash_indirect
1228 || h
->root
.type
== bfd_link_hash_warning
)
1229 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1232 new_weakdef
= false;
1235 && (flags
& BSF_WEAK
) != 0
1236 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1237 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1238 && h
->weakdef
== NULL
)
1240 /* Keep a list of all weak defined non function symbols from
1241 a dynamic object, using the weakdef field. Later in this
1242 function we will set the weakdef field to the correct
1243 value. We only put non-function symbols from dynamic
1244 objects on this list, because that happens to be the only
1245 time we need to know the normal symbol corresponding to a
1246 weak symbol, and the information is time consuming to
1247 figure out. If the weakdef field is not already NULL,
1248 then this symbol was already defined by some previous
1249 dynamic object, and we will be using that previous
1250 definition anyhow. */
1257 /* Set the alignment of a common symbol. */
1258 if (sym
.st_shndx
== SHN_COMMON
1259 && h
->root
.type
== bfd_link_hash_common
)
1263 align
= bfd_log2 (sym
.st_value
);
1264 if (align
> old_alignment
)
1265 h
->root
.u
.c
.p
->alignment_power
= align
;
1268 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1274 /* Remember the symbol size and type. */
1275 if (sym
.st_size
!= 0
1276 && (definition
|| h
->size
== 0))
1278 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1279 (*_bfd_error_handler
)
1280 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
1281 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1282 bfd_get_filename (abfd
));
1284 h
->size
= sym
.st_size
;
1287 /* If this is a common symbol, then we always want H->SIZE
1288 to be the size of the common symbol. The code just above
1289 won't fix the size if a common symbol becomes larger. We
1290 don't warn about a size change here, because that is
1291 covered by --warn-common. */
1292 if (h
->root
.type
== bfd_link_hash_common
)
1293 h
->size
= h
->root
.u
.c
.size
;
1295 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1296 && (definition
|| h
->type
== STT_NOTYPE
))
1298 if (h
->type
!= STT_NOTYPE
1299 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1300 && ! type_change_ok
)
1301 (*_bfd_error_handler
)
1302 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1303 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1304 bfd_get_filename (abfd
));
1306 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1309 if (sym
.st_other
!= 0
1310 && (definition
|| h
->other
== 0))
1311 h
->other
= sym
.st_other
;
1313 /* Set a flag in the hash table entry indicating the type of
1314 reference or definition we just found. Keep a count of
1315 the number of dynamic symbols we find. A dynamic symbol
1316 is one which is referenced or defined by both a regular
1317 object and a shared object. */
1318 old_flags
= h
->elf_link_hash_flags
;
1323 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1325 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1327 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1328 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1334 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1336 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1337 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1338 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1339 || (h
->weakdef
!= NULL
1341 && h
->weakdef
->dynindx
!= -1))
1345 h
->elf_link_hash_flags
|= new_flag
;
1347 /* If this symbol has a version, and it is the default
1348 version, we create an indirect symbol from the default
1349 name to the fully decorated name. This will cause
1350 external references which do not specify a version to be
1351 bound to this version of the symbol. */
1356 p
= strchr (name
, ELF_VER_CHR
);
1357 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1360 struct elf_link_hash_entry
*hi
;
1363 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1365 if (shortname
== NULL
)
1367 strncpy (shortname
, name
, p
- name
);
1368 shortname
[p
- name
] = '\0';
1370 /* We are going to create a new symbol. Merge it
1371 with any existing symbol with this name. For the
1372 purposes of the merge, act as though we were
1373 defining the symbol we just defined, although we
1374 actually going to define an indirect symbol. */
1375 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1376 &value
, &hi
, &override
,
1377 &type_change_ok
, &size_change_ok
))
1382 if (! (_bfd_generic_link_add_one_symbol
1383 (info
, abfd
, shortname
, BSF_INDIRECT
,
1384 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1385 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1390 /* In this case the symbol named SHORTNAME is
1391 overriding the indirect symbol we want to
1392 add. We were planning on making SHORTNAME an
1393 indirect symbol referring to NAME. SHORTNAME
1394 is the name without a version. NAME is the
1395 fully versioned name, and it is the default
1398 Overriding means that we already saw a
1399 definition for the symbol SHORTNAME in a
1400 regular object, and it is overriding the
1401 symbol defined in the dynamic object.
1403 When this happens, we actually want to change
1404 NAME, the symbol we just added, to refer to
1405 SHORTNAME. This will cause references to
1406 NAME in the shared object to become
1407 references to SHORTNAME in the regular
1408 object. This is what we expect when we
1409 override a function in a shared object: that
1410 the references in the shared object will be
1411 mapped to the definition in the regular
1414 while (hi
->root
.type
== bfd_link_hash_indirect
1415 || hi
->root
.type
== bfd_link_hash_warning
)
1416 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1418 h
->root
.type
= bfd_link_hash_indirect
;
1419 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1420 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1422 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1423 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1424 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1428 /* Now set HI to H, so that the following code
1429 will set the other fields correctly. */
1433 /* If there is a duplicate definition somewhere,
1434 then HI may not point to an indirect symbol. We
1435 will have reported an error to the user in that
1438 if (hi
->root
.type
== bfd_link_hash_indirect
)
1440 struct elf_link_hash_entry
*ht
;
1442 /* If the symbol became indirect, then we assume
1443 that we have not seen a definition before. */
1444 BFD_ASSERT ((hi
->elf_link_hash_flags
1445 & (ELF_LINK_HASH_DEF_DYNAMIC
1446 | ELF_LINK_HASH_DEF_REGULAR
))
1449 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1451 /* Copy down any references that we may have
1452 already seen to the symbol which just became
1454 ht
->elf_link_hash_flags
|=
1455 (hi
->elf_link_hash_flags
1456 & (ELF_LINK_HASH_REF_DYNAMIC
1457 | ELF_LINK_HASH_REF_REGULAR
));
1459 /* Copy over the global table offset entry.
1460 This may have been already set up by a
1461 check_relocs routine. */
1462 if (ht
->got_offset
== (bfd_vma
) -1)
1464 ht
->got_offset
= hi
->got_offset
;
1465 hi
->got_offset
= (bfd_vma
) -1;
1467 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1469 if (ht
->dynindx
== -1)
1471 ht
->dynindx
= hi
->dynindx
;
1472 ht
->dynstr_index
= hi
->dynstr_index
;
1474 hi
->dynstr_index
= 0;
1476 BFD_ASSERT (hi
->dynindx
== -1);
1478 /* FIXME: There may be other information to copy
1479 over for particular targets. */
1481 /* See if the new flags lead us to realize that
1482 the symbol must be dynamic. */
1488 || ((hi
->elf_link_hash_flags
1489 & ELF_LINK_HASH_REF_DYNAMIC
)
1495 if ((hi
->elf_link_hash_flags
1496 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1502 /* We also need to define an indirection from the
1503 nondefault version of the symbol. */
1505 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1507 if (shortname
== NULL
)
1509 strncpy (shortname
, name
, p
- name
);
1510 strcpy (shortname
+ (p
- name
), p
+ 1);
1512 /* Once again, merge with any existing symbol. */
1513 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1514 &value
, &hi
, &override
,
1515 &type_change_ok
, &size_change_ok
))
1520 /* Here SHORTNAME is a versioned name, so we
1521 don't expect to see the type of override we
1522 do in the case above. */
1523 (*_bfd_error_handler
)
1524 ("%s: warning: unexpected redefinition of `%s'",
1525 bfd_get_filename (abfd
), shortname
);
1529 if (! (_bfd_generic_link_add_one_symbol
1530 (info
, abfd
, shortname
, BSF_INDIRECT
,
1531 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1532 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1535 /* If there is a duplicate definition somewhere,
1536 then HI may not point to an indirect symbol.
1537 We will have reported an error to the user in
1540 if (hi
->root
.type
== bfd_link_hash_indirect
)
1542 /* If the symbol became indirect, then we
1543 assume that we have not seen a definition
1545 BFD_ASSERT ((hi
->elf_link_hash_flags
1546 & (ELF_LINK_HASH_DEF_DYNAMIC
1547 | ELF_LINK_HASH_DEF_REGULAR
))
1550 /* Copy down any references that we may have
1551 already seen to the symbol which just
1553 h
->elf_link_hash_flags
|=
1554 (hi
->elf_link_hash_flags
1555 & (ELF_LINK_HASH_REF_DYNAMIC
1556 | ELF_LINK_HASH_REF_REGULAR
));
1558 /* Copy over the global table offset entry.
1559 This may have been already set up by a
1560 check_relocs routine. */
1561 if (h
->got_offset
== (bfd_vma
) -1)
1563 h
->got_offset
= hi
->got_offset
;
1564 hi
->got_offset
= (bfd_vma
) -1;
1566 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1568 if (h
->dynindx
== -1)
1570 h
->dynindx
= hi
->dynindx
;
1571 h
->dynstr_index
= hi
->dynstr_index
;
1573 hi
->dynstr_index
= 0;
1575 BFD_ASSERT (hi
->dynindx
== -1);
1577 /* FIXME: There may be other information to
1578 copy over for particular targets. */
1580 /* See if the new flags lead us to realize
1581 that the symbol must be dynamic. */
1587 || ((hi
->elf_link_hash_flags
1588 & ELF_LINK_HASH_REF_DYNAMIC
)
1594 if ((hi
->elf_link_hash_flags
1595 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1604 if (dynsym
&& h
->dynindx
== -1)
1606 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1608 if (h
->weakdef
!= NULL
1610 && h
->weakdef
->dynindx
== -1)
1612 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1620 /* Now set the weakdefs field correctly for all the weak defined
1621 symbols we found. The only way to do this is to search all the
1622 symbols. Since we only need the information for non functions in
1623 dynamic objects, that's the only time we actually put anything on
1624 the list WEAKS. We need this information so that if a regular
1625 object refers to a symbol defined weakly in a dynamic object, the
1626 real symbol in the dynamic object is also put in the dynamic
1627 symbols; we also must arrange for both symbols to point to the
1628 same memory location. We could handle the general case of symbol
1629 aliasing, but a general symbol alias can only be generated in
1630 assembler code, handling it correctly would be very time
1631 consuming, and other ELF linkers don't handle general aliasing
1633 while (weaks
!= NULL
)
1635 struct elf_link_hash_entry
*hlook
;
1638 struct elf_link_hash_entry
**hpp
;
1639 struct elf_link_hash_entry
**hppend
;
1642 weaks
= hlook
->weakdef
;
1643 hlook
->weakdef
= NULL
;
1645 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1646 || hlook
->root
.type
== bfd_link_hash_defweak
1647 || hlook
->root
.type
== bfd_link_hash_common
1648 || hlook
->root
.type
== bfd_link_hash_indirect
);
1649 slook
= hlook
->root
.u
.def
.section
;
1650 vlook
= hlook
->root
.u
.def
.value
;
1652 hpp
= elf_sym_hashes (abfd
);
1653 hppend
= hpp
+ extsymcount
;
1654 for (; hpp
< hppend
; hpp
++)
1656 struct elf_link_hash_entry
*h
;
1659 if (h
!= NULL
&& h
!= hlook
1660 && h
->root
.type
== bfd_link_hash_defined
1661 && h
->root
.u
.def
.section
== slook
1662 && h
->root
.u
.def
.value
== vlook
)
1666 /* If the weak definition is in the list of dynamic
1667 symbols, make sure the real definition is put there
1669 if (hlook
->dynindx
!= -1
1670 && h
->dynindx
== -1)
1672 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1676 /* If the real definition is in the list of dynamic
1677 symbols, make sure the weak definition is put there
1678 as well. If we don't do this, then the dynamic
1679 loader might not merge the entries for the real
1680 definition and the weak definition. */
1681 if (h
->dynindx
!= -1
1682 && hlook
->dynindx
== -1)
1684 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1699 if (extversym
!= NULL
)
1705 /* If this object is the same format as the output object, and it is
1706 not a shared library, then let the backend look through the
1709 This is required to build global offset table entries and to
1710 arrange for dynamic relocs. It is not required for the
1711 particular common case of linking non PIC code, even when linking
1712 against shared libraries, but unfortunately there is no way of
1713 knowing whether an object file has been compiled PIC or not.
1714 Looking through the relocs is not particularly time consuming.
1715 The problem is that we must either (1) keep the relocs in memory,
1716 which causes the linker to require additional runtime memory or
1717 (2) read the relocs twice from the input file, which wastes time.
1718 This would be a good case for using mmap.
1720 I have no idea how to handle linking PIC code into a file of a
1721 different format. It probably can't be done. */
1722 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1724 && abfd
->xvec
== info
->hash
->creator
1725 && check_relocs
!= NULL
)
1729 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1731 Elf_Internal_Rela
*internal_relocs
;
1734 if ((o
->flags
& SEC_RELOC
) == 0
1735 || o
->reloc_count
== 0
1736 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1737 && (o
->flags
& SEC_DEBUGGING
) != 0)
1738 || bfd_is_abs_section (o
->output_section
))
1741 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1742 (abfd
, o
, (PTR
) NULL
,
1743 (Elf_Internal_Rela
*) NULL
,
1744 info
->keep_memory
));
1745 if (internal_relocs
== NULL
)
1748 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1750 if (! info
->keep_memory
)
1751 free (internal_relocs
);
1758 /* If this is a non-traditional, non-relocateable link, try to
1759 optimize the handling of the .stab/.stabstr sections. */
1761 && ! info
->relocateable
1762 && ! info
->traditional_format
1763 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1764 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1766 asection
*stab
, *stabstr
;
1768 stab
= bfd_get_section_by_name (abfd
, ".stab");
1771 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1773 if (stabstr
!= NULL
)
1775 struct bfd_elf_section_data
*secdata
;
1777 secdata
= elf_section_data (stab
);
1778 if (! _bfd_link_section_stabs (abfd
,
1779 &elf_hash_table (info
)->stab_info
,
1781 &secdata
->stab_info
))
1796 if (extversym
!= NULL
)
1801 /* Create some sections which will be filled in with dynamic linking
1802 information. ABFD is an input file which requires dynamic sections
1803 to be created. The dynamic sections take up virtual memory space
1804 when the final executable is run, so we need to create them before
1805 addresses are assigned to the output sections. We work out the
1806 actual contents and size of these sections later. */
1809 elf_link_create_dynamic_sections (abfd
, info
)
1811 struct bfd_link_info
*info
;
1814 register asection
*s
;
1815 struct elf_link_hash_entry
*h
;
1816 struct elf_backend_data
*bed
;
1818 if (elf_hash_table (info
)->dynamic_sections_created
)
1821 /* Make sure that all dynamic sections use the same input BFD. */
1822 if (elf_hash_table (info
)->dynobj
== NULL
)
1823 elf_hash_table (info
)->dynobj
= abfd
;
1825 abfd
= elf_hash_table (info
)->dynobj
;
1827 /* Note that we set the SEC_IN_MEMORY flag for all of these
1829 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1830 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1832 /* A dynamically linked executable has a .interp section, but a
1833 shared library does not. */
1836 s
= bfd_make_section (abfd
, ".interp");
1838 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1842 /* Create sections to hold version informations. These are removed
1843 if they are not needed. */
1844 s
= bfd_make_section (abfd
, ".gnu.version_d");
1846 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1847 || ! bfd_set_section_alignment (abfd
, s
, 2))
1850 s
= bfd_make_section (abfd
, ".gnu.version");
1852 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1853 || ! bfd_set_section_alignment (abfd
, s
, 1))
1856 s
= bfd_make_section (abfd
, ".gnu.version_r");
1858 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1859 || ! bfd_set_section_alignment (abfd
, s
, 2))
1862 s
= bfd_make_section (abfd
, ".dynsym");
1864 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1865 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1868 s
= bfd_make_section (abfd
, ".dynstr");
1870 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1873 /* Create a strtab to hold the dynamic symbol names. */
1874 if (elf_hash_table (info
)->dynstr
== NULL
)
1876 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1877 if (elf_hash_table (info
)->dynstr
== NULL
)
1881 s
= bfd_make_section (abfd
, ".dynamic");
1883 || ! bfd_set_section_flags (abfd
, s
, flags
)
1884 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1887 /* The special symbol _DYNAMIC is always set to the start of the
1888 .dynamic section. This call occurs before we have processed the
1889 symbols for any dynamic object, so we don't have to worry about
1890 overriding a dynamic definition. We could set _DYNAMIC in a
1891 linker script, but we only want to define it if we are, in fact,
1892 creating a .dynamic section. We don't want to define it if there
1893 is no .dynamic section, since on some ELF platforms the start up
1894 code examines it to decide how to initialize the process. */
1896 if (! (_bfd_generic_link_add_one_symbol
1897 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1898 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1899 (struct bfd_link_hash_entry
**) &h
)))
1901 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1902 h
->type
= STT_OBJECT
;
1905 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1908 s
= bfd_make_section (abfd
, ".hash");
1910 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1911 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1914 /* Let the backend create the rest of the sections. This lets the
1915 backend set the right flags. The backend will normally create
1916 the .got and .plt sections. */
1917 bed
= get_elf_backend_data (abfd
);
1918 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1921 elf_hash_table (info
)->dynamic_sections_created
= true;
1926 /* Add an entry to the .dynamic table. */
1929 elf_add_dynamic_entry (info
, tag
, val
)
1930 struct bfd_link_info
*info
;
1934 Elf_Internal_Dyn dyn
;
1938 bfd_byte
*newcontents
;
1940 dynobj
= elf_hash_table (info
)->dynobj
;
1942 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1943 BFD_ASSERT (s
!= NULL
);
1945 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1946 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1947 if (newcontents
== NULL
)
1951 dyn
.d_un
.d_val
= val
;
1952 elf_swap_dyn_out (dynobj
, &dyn
,
1953 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1955 s
->_raw_size
= newsize
;
1956 s
->contents
= newcontents
;
1962 /* Read and swap the relocs for a section. They may have been cached.
1963 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1964 they are used as buffers to read into. They are known to be large
1965 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1966 value is allocated using either malloc or bfd_alloc, according to
1967 the KEEP_MEMORY argument. */
1970 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1974 PTR external_relocs
;
1975 Elf_Internal_Rela
*internal_relocs
;
1976 boolean keep_memory
;
1978 Elf_Internal_Shdr
*rel_hdr
;
1980 Elf_Internal_Rela
*alloc2
= NULL
;
1982 if (elf_section_data (o
)->relocs
!= NULL
)
1983 return elf_section_data (o
)->relocs
;
1985 if (o
->reloc_count
== 0)
1988 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1990 if (internal_relocs
== NULL
)
1994 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1996 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1998 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1999 if (internal_relocs
== NULL
)
2003 if (external_relocs
== NULL
)
2005 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
2008 external_relocs
= alloc1
;
2011 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
2012 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
2013 != rel_hdr
->sh_size
))
2016 /* Swap in the relocs. For convenience, we always produce an
2017 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
2019 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2021 Elf_External_Rel
*erel
;
2022 Elf_External_Rel
*erelend
;
2023 Elf_Internal_Rela
*irela
;
2025 erel
= (Elf_External_Rel
*) external_relocs
;
2026 erelend
= erel
+ o
->reloc_count
;
2027 irela
= internal_relocs
;
2028 for (; erel
< erelend
; erel
++, irela
++)
2030 Elf_Internal_Rel irel
;
2032 elf_swap_reloc_in (abfd
, erel
, &irel
);
2033 irela
->r_offset
= irel
.r_offset
;
2034 irela
->r_info
= irel
.r_info
;
2035 irela
->r_addend
= 0;
2040 Elf_External_Rela
*erela
;
2041 Elf_External_Rela
*erelaend
;
2042 Elf_Internal_Rela
*irela
;
2044 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2046 erela
= (Elf_External_Rela
*) external_relocs
;
2047 erelaend
= erela
+ o
->reloc_count
;
2048 irela
= internal_relocs
;
2049 for (; erela
< erelaend
; erela
++, irela
++)
2050 elf_swap_reloca_in (abfd
, erela
, irela
);
2053 /* Cache the results for next time, if we can. */
2055 elf_section_data (o
)->relocs
= internal_relocs
;
2060 /* Don't free alloc2, since if it was allocated we are passing it
2061 back (under the name of internal_relocs). */
2063 return internal_relocs
;
2074 /* Record an assignment to a symbol made by a linker script. We need
2075 this in case some dynamic object refers to this symbol. */
2079 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2081 struct bfd_link_info
*info
;
2085 struct elf_link_hash_entry
*h
;
2087 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2090 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2094 if (h
->root
.type
== bfd_link_hash_new
)
2095 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2097 /* If this symbol is being provided by the linker script, and it is
2098 currently defined by a dynamic object, but not by a regular
2099 object, then mark it as undefined so that the generic linker will
2100 force the correct value. */
2102 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2103 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2104 h
->root
.type
= bfd_link_hash_undefined
;
2106 /* If this symbol is not being provided by the linker script, and it is
2107 currently defined by a dynamic object, but not by a regular object,
2108 then clear out any version information because the symbol will not be
2109 associated with the dynamic object any more. */
2111 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2112 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2113 h
->verinfo
.verdef
= NULL
;
2115 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2116 h
->type
= STT_OBJECT
;
2118 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2119 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2121 && h
->dynindx
== -1)
2123 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2126 /* If this is a weak defined symbol, and we know a corresponding
2127 real symbol from the same dynamic object, make sure the real
2128 symbol is also made into a dynamic symbol. */
2129 if (h
->weakdef
!= NULL
2130 && h
->weakdef
->dynindx
== -1)
2132 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2140 /* This structure is used to pass information to
2141 elf_link_assign_sym_version. */
2143 struct elf_assign_sym_version_info
2147 /* General link information. */
2148 struct bfd_link_info
*info
;
2150 struct bfd_elf_version_tree
*verdefs
;
2151 /* Whether we are exporting all dynamic symbols. */
2152 boolean export_dynamic
;
2153 /* Whether we removed any symbols from the dynamic symbol table. */
2154 boolean removed_dynamic
;
2155 /* Whether we had a failure. */
2159 /* This structure is used to pass information to
2160 elf_link_find_version_dependencies. */
2162 struct elf_find_verdep_info
2166 /* General link information. */
2167 struct bfd_link_info
*info
;
2168 /* The number of dependencies. */
2170 /* Whether we had a failure. */
2174 /* Array used to determine the number of hash table buckets to use
2175 based on the number of symbols there are. If there are fewer than
2176 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2177 fewer than 37 we use 17 buckets, and so forth. We never use more
2178 than 32771 buckets. */
2180 static const size_t elf_buckets
[] =
2182 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2186 /* Set up the sizes and contents of the ELF dynamic sections. This is
2187 called by the ELF linker emulation before_allocation routine. We
2188 must set the sizes of the sections before the linker sets the
2189 addresses of the various sections. */
2192 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2193 export_dynamic
, filter_shlib
,
2194 auxiliary_filters
, info
, sinterpptr
,
2199 boolean export_dynamic
;
2200 const char *filter_shlib
;
2201 const char * const *auxiliary_filters
;
2202 struct bfd_link_info
*info
;
2203 asection
**sinterpptr
;
2204 struct bfd_elf_version_tree
*verdefs
;
2206 bfd_size_type soname_indx
;
2208 struct elf_backend_data
*bed
;
2209 bfd_size_type old_dynsymcount
;
2210 struct elf_assign_sym_version_info asvinfo
;
2216 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2219 /* The backend may have to create some sections regardless of whether
2220 we're dynamic or not. */
2221 bed
= get_elf_backend_data (output_bfd
);
2222 if (bed
->elf_backend_always_size_sections
2223 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2226 dynobj
= elf_hash_table (info
)->dynobj
;
2228 /* If there were no dynamic objects in the link, there is nothing to
2233 /* If we are supposed to export all symbols into the dynamic symbol
2234 table (this is not the normal case), then do so. */
2237 struct elf_info_failed eif
;
2241 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2247 if (elf_hash_table (info
)->dynamic_sections_created
)
2249 struct elf_info_failed eif
;
2250 struct elf_link_hash_entry
*h
;
2251 bfd_size_type strsize
;
2253 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2254 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2258 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2259 soname
, true, true);
2260 if (soname_indx
== (bfd_size_type
) -1
2261 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2267 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2275 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2277 if (indx
== (bfd_size_type
) -1
2278 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2282 if (filter_shlib
!= NULL
)
2286 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2287 filter_shlib
, true, true);
2288 if (indx
== (bfd_size_type
) -1
2289 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2293 if (auxiliary_filters
!= NULL
)
2295 const char * const *p
;
2297 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2301 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2303 if (indx
== (bfd_size_type
) -1
2304 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2309 /* Attach all the symbols to their version information. */
2310 asvinfo
.output_bfd
= output_bfd
;
2311 asvinfo
.info
= info
;
2312 asvinfo
.verdefs
= verdefs
;
2313 asvinfo
.export_dynamic
= export_dynamic
;
2314 asvinfo
.removed_dynamic
= false;
2315 asvinfo
.failed
= false;
2317 elf_link_hash_traverse (elf_hash_table (info
),
2318 elf_link_assign_sym_version
,
2323 /* Find all symbols which were defined in a dynamic object and make
2324 the backend pick a reasonable value for them. */
2327 elf_link_hash_traverse (elf_hash_table (info
),
2328 elf_adjust_dynamic_symbol
,
2333 /* Add some entries to the .dynamic section. We fill in some of the
2334 values later, in elf_bfd_final_link, but we must add the entries
2335 now so that we know the final size of the .dynamic section. */
2336 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2339 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2340 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2342 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2345 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2348 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2349 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2351 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2354 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2355 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2356 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2357 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2358 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2359 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2360 sizeof (Elf_External_Sym
)))
2364 /* The backend must work out the sizes of all the other dynamic
2366 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2367 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2370 if (elf_hash_table (info
)->dynamic_sections_created
)
2375 size_t bucketcount
= 0;
2376 Elf_Internal_Sym isym
;
2378 /* Set up the version definition section. */
2379 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2380 BFD_ASSERT (s
!= NULL
);
2382 /* We may have created additional version definitions if we are
2383 just linking a regular application. */
2384 verdefs
= asvinfo
.verdefs
;
2386 if (verdefs
== NULL
)
2390 /* Don't include this section in the output file. */
2391 for (spp
= &output_bfd
->sections
;
2392 *spp
!= s
->output_section
;
2393 spp
= &(*spp
)->next
)
2395 *spp
= s
->output_section
->next
;
2396 --output_bfd
->section_count
;
2402 struct bfd_elf_version_tree
*t
;
2404 Elf_Internal_Verdef def
;
2405 Elf_Internal_Verdaux defaux
;
2407 if (asvinfo
.removed_dynamic
)
2409 /* Some dynamic symbols were changed to be local
2410 symbols. In this case, we renumber all of the
2411 dynamic symbols, so that we don't have a hole. If
2412 the backend changed dynsymcount, then assume that the
2413 new symbols are at the start. This is the case on
2414 the MIPS. FIXME: The names of the removed symbols
2415 will still be in the dynamic string table, wasting
2417 elf_hash_table (info
)->dynsymcount
=
2418 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2419 elf_link_hash_traverse (elf_hash_table (info
),
2420 elf_link_renumber_dynsyms
,
2427 /* Make space for the base version. */
2428 size
+= sizeof (Elf_External_Verdef
);
2429 size
+= sizeof (Elf_External_Verdaux
);
2432 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2434 struct bfd_elf_version_deps
*n
;
2436 size
+= sizeof (Elf_External_Verdef
);
2437 size
+= sizeof (Elf_External_Verdaux
);
2440 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2441 size
+= sizeof (Elf_External_Verdaux
);
2444 s
->_raw_size
= size
;
2445 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2446 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2449 /* Fill in the version definition section. */
2453 def
.vd_version
= VER_DEF_CURRENT
;
2454 def
.vd_flags
= VER_FLG_BASE
;
2457 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2458 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2459 + sizeof (Elf_External_Verdaux
));
2461 if (soname_indx
!= -1)
2463 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2464 defaux
.vda_name
= soname_indx
;
2471 name
= output_bfd
->filename
;
2472 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2473 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2475 if (indx
== (bfd_size_type
) -1)
2477 defaux
.vda_name
= indx
;
2479 defaux
.vda_next
= 0;
2481 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2482 (Elf_External_Verdef
*)p
);
2483 p
+= sizeof (Elf_External_Verdef
);
2484 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2485 (Elf_External_Verdaux
*) p
);
2486 p
+= sizeof (Elf_External_Verdaux
);
2488 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2491 struct bfd_elf_version_deps
*n
;
2492 struct elf_link_hash_entry
*h
;
2495 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2498 /* Add a symbol representing this version. */
2500 if (! (_bfd_generic_link_add_one_symbol
2501 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2502 (bfd_vma
) 0, (const char *) NULL
, false,
2503 get_elf_backend_data (dynobj
)->collect
,
2504 (struct bfd_link_hash_entry
**) &h
)))
2506 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2507 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2508 h
->type
= STT_OBJECT
;
2509 h
->verinfo
.vertree
= t
;
2511 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2514 def
.vd_version
= VER_DEF_CURRENT
;
2516 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2517 def
.vd_flags
|= VER_FLG_WEAK
;
2518 def
.vd_ndx
= t
->vernum
+ 1;
2519 def
.vd_cnt
= cdeps
+ 1;
2520 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2521 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2522 if (t
->next
!= NULL
)
2523 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2524 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2528 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2529 (Elf_External_Verdef
*) p
);
2530 p
+= sizeof (Elf_External_Verdef
);
2532 defaux
.vda_name
= h
->dynstr_index
;
2533 if (t
->deps
== NULL
)
2534 defaux
.vda_next
= 0;
2536 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2537 t
->name_indx
= defaux
.vda_name
;
2539 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2540 (Elf_External_Verdaux
*) p
);
2541 p
+= sizeof (Elf_External_Verdaux
);
2543 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2545 defaux
.vda_name
= n
->version_needed
->name_indx
;
2546 if (n
->next
== NULL
)
2547 defaux
.vda_next
= 0;
2549 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2551 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2552 (Elf_External_Verdaux
*) p
);
2553 p
+= sizeof (Elf_External_Verdaux
);
2557 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2558 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2561 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2564 /* Work out the size of the version reference section. */
2566 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2567 BFD_ASSERT (s
!= NULL
);
2569 struct elf_find_verdep_info sinfo
;
2571 sinfo
.output_bfd
= output_bfd
;
2573 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2574 if (sinfo
.vers
== 0)
2576 sinfo
.failed
= false;
2578 elf_link_hash_traverse (elf_hash_table (info
),
2579 elf_link_find_version_dependencies
,
2582 if (elf_tdata (output_bfd
)->verref
== NULL
)
2586 /* We don't have any version definitions, so we can just
2587 remove the section. */
2589 for (spp
= &output_bfd
->sections
;
2590 *spp
!= s
->output_section
;
2591 spp
= &(*spp
)->next
)
2593 *spp
= s
->output_section
->next
;
2594 --output_bfd
->section_count
;
2598 Elf_Internal_Verneed
*t
;
2603 /* Build the version definition section. */
2606 for (t
= elf_tdata (output_bfd
)->verref
;
2610 Elf_Internal_Vernaux
*a
;
2612 size
+= sizeof (Elf_External_Verneed
);
2614 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2615 size
+= sizeof (Elf_External_Vernaux
);
2618 s
->_raw_size
= size
;
2619 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2620 if (s
->contents
== NULL
)
2624 for (t
= elf_tdata (output_bfd
)->verref
;
2629 Elf_Internal_Vernaux
*a
;
2633 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2636 t
->vn_version
= VER_NEED_CURRENT
;
2638 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2639 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2640 elf_dt_name (t
->vn_bfd
),
2643 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2644 t
->vn_bfd
->filename
, true, false);
2645 if (indx
== (bfd_size_type
) -1)
2648 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2649 if (t
->vn_nextref
== NULL
)
2652 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2653 + caux
* sizeof (Elf_External_Vernaux
));
2655 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2656 (Elf_External_Verneed
*) p
);
2657 p
+= sizeof (Elf_External_Verneed
);
2659 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2661 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2663 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2664 a
->vna_nodename
, true, false);
2665 if (indx
== (bfd_size_type
) -1)
2668 if (a
->vna_nextptr
== NULL
)
2671 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2673 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2674 (Elf_External_Vernaux
*) p
);
2675 p
+= sizeof (Elf_External_Vernaux
);
2679 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2680 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2683 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2687 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2689 /* Work out the size of the symbol version section. */
2690 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2691 BFD_ASSERT (s
!= NULL
);
2692 if (dynsymcount
== 0
2693 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2697 /* We don't need any symbol versions; just discard the
2699 for (spp
= &output_bfd
->sections
;
2700 *spp
!= s
->output_section
;
2701 spp
= &(*spp
)->next
)
2703 *spp
= s
->output_section
->next
;
2704 --output_bfd
->section_count
;
2708 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2709 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2710 if (s
->contents
== NULL
)
2713 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2717 /* Set the size of the .dynsym and .hash sections. We counted
2718 the number of dynamic symbols in elf_link_add_object_symbols.
2719 We will build the contents of .dynsym and .hash when we build
2720 the final symbol table, because until then we do not know the
2721 correct value to give the symbols. We built the .dynstr
2722 section as we went along in elf_link_add_object_symbols. */
2723 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2724 BFD_ASSERT (s
!= NULL
);
2725 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2726 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2727 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2730 /* The first entry in .dynsym is a dummy symbol. */
2737 elf_swap_symbol_out (output_bfd
, &isym
,
2738 (PTR
) (Elf_External_Sym
*) s
->contents
);
2740 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2742 bucketcount
= elf_buckets
[i
];
2743 if (dynsymcount
< elf_buckets
[i
+ 1])
2747 s
= bfd_get_section_by_name (dynobj
, ".hash");
2748 BFD_ASSERT (s
!= NULL
);
2749 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2750 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2751 if (s
->contents
== NULL
)
2753 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2755 put_word (output_bfd
, bucketcount
, s
->contents
);
2756 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2758 elf_hash_table (info
)->bucketcount
= bucketcount
;
2760 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2761 BFD_ASSERT (s
!= NULL
);
2762 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2764 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2771 /* Fix up the flags for a symbol. This handles various cases which
2772 can only be fixed after all the input files are seen. This is
2773 currently called by both adjust_dynamic_symbol and
2774 assign_sym_version, which is unnecessary but perhaps more robust in
2775 the face of future changes. */
2778 elf_fix_symbol_flags (h
, eif
)
2779 struct elf_link_hash_entry
*h
;
2780 struct elf_info_failed
*eif
;
2782 /* If this symbol was mentioned in a non-ELF file, try to set
2783 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2784 permit a non-ELF file to correctly refer to a symbol defined in
2785 an ELF dynamic object. */
2786 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2788 if (h
->root
.type
!= bfd_link_hash_defined
2789 && h
->root
.type
!= bfd_link_hash_defweak
)
2790 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2793 if (h
->root
.u
.def
.section
->owner
!= NULL
2794 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2795 == bfd_target_elf_flavour
))
2796 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2798 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2801 if (h
->dynindx
== -1
2802 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2803 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2805 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2813 /* If this is a final link, and the symbol was defined as a common
2814 symbol in a regular object file, and there was no definition in
2815 any dynamic object, then the linker will have allocated space for
2816 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2817 flag will not have been set. */
2818 if (h
->root
.type
== bfd_link_hash_defined
2819 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2820 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2821 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2822 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2823 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2825 /* If -Bsymbolic was used (which means to bind references to global
2826 symbols to the definition within the shared object), and this
2827 symbol was defined in a regular object, then it actually doesn't
2828 need a PLT entry. */
2829 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2830 && eif
->info
->shared
2831 && eif
->info
->symbolic
2832 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2833 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2838 /* Make the backend pick a good value for a dynamic symbol. This is
2839 called via elf_link_hash_traverse, and also calls itself
2843 elf_adjust_dynamic_symbol (h
, data
)
2844 struct elf_link_hash_entry
*h
;
2847 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2849 struct elf_backend_data
*bed
;
2851 /* Ignore indirect symbols. These are added by the versioning code. */
2852 if (h
->root
.type
== bfd_link_hash_indirect
)
2855 /* Fix the symbol flags. */
2856 if (! elf_fix_symbol_flags (h
, eif
))
2859 /* If this symbol does not require a PLT entry, and it is not
2860 defined by a dynamic object, or is not referenced by a regular
2861 object, ignore it. We do have to handle a weak defined symbol,
2862 even if no regular object refers to it, if we decided to add it
2863 to the dynamic symbol table. FIXME: Do we normally need to worry
2864 about symbols which are defined by one dynamic object and
2865 referenced by another one? */
2866 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2867 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2868 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2869 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2870 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2873 /* If we've already adjusted this symbol, don't do it again. This
2874 can happen via a recursive call. */
2875 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2878 /* Don't look at this symbol again. Note that we must set this
2879 after checking the above conditions, because we may look at a
2880 symbol once, decide not to do anything, and then get called
2881 recursively later after REF_REGULAR is set below. */
2882 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2884 /* If this is a weak definition, and we know a real definition, and
2885 the real symbol is not itself defined by a regular object file,
2886 then get a good value for the real definition. We handle the
2887 real symbol first, for the convenience of the backend routine.
2889 Note that there is a confusing case here. If the real definition
2890 is defined by a regular object file, we don't get the real symbol
2891 from the dynamic object, but we do get the weak symbol. If the
2892 processor backend uses a COPY reloc, then if some routine in the
2893 dynamic object changes the real symbol, we will not see that
2894 change in the corresponding weak symbol. This is the way other
2895 ELF linkers work as well, and seems to be a result of the shared
2898 I will clarify this issue. Most SVR4 shared libraries define the
2899 variable _timezone and define timezone as a weak synonym. The
2900 tzset call changes _timezone. If you write
2901 extern int timezone;
2903 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2904 you might expect that, since timezone is a synonym for _timezone,
2905 the same number will print both times. However, if the processor
2906 backend uses a COPY reloc, then actually timezone will be copied
2907 into your process image, and, since you define _timezone
2908 yourself, _timezone will not. Thus timezone and _timezone will
2909 wind up at different memory locations. The tzset call will set
2910 _timezone, leaving timezone unchanged. */
2912 if (h
->weakdef
!= NULL
)
2914 struct elf_link_hash_entry
*weakdef
;
2916 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2917 || h
->root
.type
== bfd_link_hash_defweak
);
2918 weakdef
= h
->weakdef
;
2919 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2920 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2921 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2922 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2924 /* This symbol is defined by a regular object file, so we
2925 will not do anything special. Clear weakdef for the
2926 convenience of the processor backend. */
2931 /* There is an implicit reference by a regular object file
2932 via the weak symbol. */
2933 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2934 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2939 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2940 bed
= get_elf_backend_data (dynobj
);
2941 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2950 /* This routine is used to export all defined symbols into the dynamic
2951 symbol table. It is called via elf_link_hash_traverse. */
2954 elf_export_symbol (h
, data
)
2955 struct elf_link_hash_entry
*h
;
2958 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2960 /* Ignore indirect symbols. These are added by the versioning code. */
2961 if (h
->root
.type
== bfd_link_hash_indirect
)
2964 if (h
->dynindx
== -1
2965 && (h
->elf_link_hash_flags
2966 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2968 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2978 /* Look through the symbols which are defined in other shared
2979 libraries and referenced here. Update the list of version
2980 dependencies. This will be put into the .gnu.version_r section.
2981 This function is called via elf_link_hash_traverse. */
2984 elf_link_find_version_dependencies (h
, data
)
2985 struct elf_link_hash_entry
*h
;
2988 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2989 Elf_Internal_Verneed
*t
;
2990 Elf_Internal_Vernaux
*a
;
2992 /* We only care about symbols defined in shared objects with version
2994 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2995 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2997 || h
->verinfo
.verdef
== NULL
)
3000 /* See if we already know about this version. */
3001 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3003 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3006 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3007 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3013 /* This is a new version. Add it to tree we are building. */
3017 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3020 rinfo
->failed
= true;
3024 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3025 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3026 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3029 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3031 /* Note that we are copying a string pointer here, and testing it
3032 above. If bfd_elf_string_from_elf_section is ever changed to
3033 discard the string data when low in memory, this will have to be
3035 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3037 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3038 a
->vna_nextptr
= t
->vn_auxptr
;
3040 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3043 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3050 /* Figure out appropriate versions for all the symbols. We may not
3051 have the version number script until we have read all of the input
3052 files, so until that point we don't know which symbols should be
3053 local. This function is called via elf_link_hash_traverse. */
3056 elf_link_assign_sym_version (h
, data
)
3057 struct elf_link_hash_entry
*h
;
3060 struct elf_assign_sym_version_info
*sinfo
=
3061 (struct elf_assign_sym_version_info
*) data
;
3062 struct bfd_link_info
*info
= sinfo
->info
;
3063 struct elf_info_failed eif
;
3066 /* Fix the symbol flags. */
3069 if (! elf_fix_symbol_flags (h
, &eif
))
3072 sinfo
->failed
= true;
3076 /* We only need version numbers for symbols defined in regular
3078 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3081 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3082 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3084 struct bfd_elf_version_tree
*t
;
3089 /* There are two consecutive ELF_VER_CHR characters if this is
3090 not a hidden symbol. */
3092 if (*p
== ELF_VER_CHR
)
3098 /* If there is no version string, we can just return out. */
3102 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3106 /* Look for the version. If we find it, it is no longer weak. */
3107 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3109 if (strcmp (t
->name
, p
) == 0)
3111 h
->verinfo
.vertree
= t
;
3114 /* See if there is anything to force this symbol to
3116 if (t
->locals
!= NULL
)
3120 struct bfd_elf_version_expr
*d
;
3122 len
= p
- h
->root
.root
.string
;
3123 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3126 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3127 alc
[len
- 1] = '\0';
3128 if (alc
[len
- 2] == ELF_VER_CHR
)
3129 alc
[len
- 2] = '\0';
3131 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3133 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3134 || fnmatch (d
->match
, alc
, 0) == 0)
3136 if (h
->dynindx
!= -1
3138 && ! sinfo
->export_dynamic
)
3140 sinfo
->removed_dynamic
= true;
3141 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3142 h
->elf_link_hash_flags
&=~
3143 ELF_LINK_HASH_NEEDS_PLT
;
3145 /* FIXME: The name of the symbol has
3146 already been recorded in the dynamic
3147 string table section. */
3154 bfd_release (sinfo
->output_bfd
, alc
);
3161 /* If we are building an application, we need to create a
3162 version node for this version. */
3163 if (t
== NULL
&& ! info
->shared
)
3165 struct bfd_elf_version_tree
**pp
;
3168 /* If we aren't going to export this symbol, we don't need
3169 to worry about it. */
3170 if (h
->dynindx
== -1)
3173 t
= ((struct bfd_elf_version_tree
*)
3174 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3177 sinfo
->failed
= true;
3186 t
->name_indx
= (unsigned int) -1;
3190 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3192 t
->vernum
= version_index
;
3196 h
->verinfo
.vertree
= t
;
3200 /* We could not find the version for a symbol when
3201 generating a shared archive. Return an error. */
3202 (*_bfd_error_handler
)
3203 ("%s: undefined version name %s",
3204 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3205 bfd_set_error (bfd_error_bad_value
);
3206 sinfo
->failed
= true;
3211 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3214 /* If we don't have a version for this symbol, see if we can find
3216 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3218 struct bfd_elf_version_tree
*t
;
3219 struct bfd_elf_version_tree
*deflt
;
3220 struct bfd_elf_version_expr
*d
;
3222 /* See if can find what version this symbol is in. If the
3223 symbol is supposed to be local, then don't actually register
3226 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3228 if (t
->globals
!= NULL
)
3230 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3232 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3234 h
->verinfo
.vertree
= t
;
3243 if (t
->locals
!= NULL
)
3245 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3247 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3249 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3251 h
->verinfo
.vertree
= t
;
3252 if (h
->dynindx
!= -1
3254 && ! sinfo
->export_dynamic
)
3256 sinfo
->removed_dynamic
= true;
3257 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3258 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3260 /* FIXME: The name of the symbol has already
3261 been recorded in the dynamic string table
3273 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3275 h
->verinfo
.vertree
= deflt
;
3276 if (h
->dynindx
!= -1
3278 && ! sinfo
->export_dynamic
)
3280 sinfo
->removed_dynamic
= true;
3281 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3282 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3284 /* FIXME: The name of the symbol has already been
3285 recorded in the dynamic string table section. */
3293 /* This function is used to renumber the dynamic symbols, if some of
3294 them are removed because they are marked as local. This is called
3295 via elf_link_hash_traverse. */
3298 elf_link_renumber_dynsyms (h
, data
)
3299 struct elf_link_hash_entry
*h
;
3302 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3304 if (h
->dynindx
!= -1)
3306 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3307 ++elf_hash_table (info
)->dynsymcount
;
3313 /* Final phase of ELF linker. */
3315 /* A structure we use to avoid passing large numbers of arguments. */
3317 struct elf_final_link_info
3319 /* General link information. */
3320 struct bfd_link_info
*info
;
3323 /* Symbol string table. */
3324 struct bfd_strtab_hash
*symstrtab
;
3325 /* .dynsym section. */
3326 asection
*dynsym_sec
;
3327 /* .hash section. */
3329 /* symbol version section (.gnu.version). */
3330 asection
*symver_sec
;
3331 /* Buffer large enough to hold contents of any section. */
3333 /* Buffer large enough to hold external relocs of any section. */
3334 PTR external_relocs
;
3335 /* Buffer large enough to hold internal relocs of any section. */
3336 Elf_Internal_Rela
*internal_relocs
;
3337 /* Buffer large enough to hold external local symbols of any input
3339 Elf_External_Sym
*external_syms
;
3340 /* Buffer large enough to hold internal local symbols of any input
3342 Elf_Internal_Sym
*internal_syms
;
3343 /* Array large enough to hold a symbol index for each local symbol
3344 of any input BFD. */
3346 /* Array large enough to hold a section pointer for each local
3347 symbol of any input BFD. */
3348 asection
**sections
;
3349 /* Buffer to hold swapped out symbols. */
3350 Elf_External_Sym
*symbuf
;
3351 /* Number of swapped out symbols in buffer. */
3352 size_t symbuf_count
;
3353 /* Number of symbols which fit in symbuf. */
3357 static boolean elf_link_output_sym
3358 PARAMS ((struct elf_final_link_info
*, const char *,
3359 Elf_Internal_Sym
*, asection
*));
3360 static boolean elf_link_flush_output_syms
3361 PARAMS ((struct elf_final_link_info
*));
3362 static boolean elf_link_output_extsym
3363 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3364 static boolean elf_link_input_bfd
3365 PARAMS ((struct elf_final_link_info
*, bfd
*));
3366 static boolean elf_reloc_link_order
3367 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3368 struct bfd_link_order
*));
3370 /* This struct is used to pass information to elf_link_output_extsym. */
3372 struct elf_outext_info
3376 struct elf_final_link_info
*finfo
;
3379 /* Do the final step of an ELF link. */
3382 elf_bfd_final_link (abfd
, info
)
3384 struct bfd_link_info
*info
;
3388 struct elf_final_link_info finfo
;
3389 register asection
*o
;
3390 register struct bfd_link_order
*p
;
3392 size_t max_contents_size
;
3393 size_t max_external_reloc_size
;
3394 size_t max_internal_reloc_count
;
3395 size_t max_sym_count
;
3397 Elf_Internal_Sym elfsym
;
3399 Elf_Internal_Shdr
*symtab_hdr
;
3400 Elf_Internal_Shdr
*symstrtab_hdr
;
3401 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3402 struct elf_outext_info eoinfo
;
3405 abfd
->flags
|= DYNAMIC
;
3407 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3408 dynobj
= elf_hash_table (info
)->dynobj
;
3411 finfo
.output_bfd
= abfd
;
3412 finfo
.symstrtab
= elf_stringtab_init ();
3413 if (finfo
.symstrtab
== NULL
)
3418 finfo
.dynsym_sec
= NULL
;
3419 finfo
.hash_sec
= NULL
;
3420 finfo
.symver_sec
= NULL
;
3424 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3425 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3426 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3427 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3428 /* Note that it is OK if symver_sec is NULL. */
3431 finfo
.contents
= NULL
;
3432 finfo
.external_relocs
= NULL
;
3433 finfo
.internal_relocs
= NULL
;
3434 finfo
.external_syms
= NULL
;
3435 finfo
.internal_syms
= NULL
;
3436 finfo
.indices
= NULL
;
3437 finfo
.sections
= NULL
;
3438 finfo
.symbuf
= NULL
;
3439 finfo
.symbuf_count
= 0;
3441 /* Count up the number of relocations we will output for each output
3442 section, so that we know the sizes of the reloc sections. We
3443 also figure out some maximum sizes. */
3444 max_contents_size
= 0;
3445 max_external_reloc_size
= 0;
3446 max_internal_reloc_count
= 0;
3448 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3452 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3454 if (p
->type
== bfd_section_reloc_link_order
3455 || p
->type
== bfd_symbol_reloc_link_order
)
3457 else if (p
->type
== bfd_indirect_link_order
)
3461 sec
= p
->u
.indirect
.section
;
3463 /* Mark all sections which are to be included in the
3464 link. This will normally be every section. We need
3465 to do this so that we can identify any sections which
3466 the linker has decided to not include. */
3467 sec
->linker_mark
= true;
3469 if (info
->relocateable
)
3470 o
->reloc_count
+= sec
->reloc_count
;
3472 if (sec
->_raw_size
> max_contents_size
)
3473 max_contents_size
= sec
->_raw_size
;
3474 if (sec
->_cooked_size
> max_contents_size
)
3475 max_contents_size
= sec
->_cooked_size
;
3477 /* We are interested in just local symbols, not all
3479 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3480 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3484 if (elf_bad_symtab (sec
->owner
))
3485 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3486 / sizeof (Elf_External_Sym
));
3488 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3490 if (sym_count
> max_sym_count
)
3491 max_sym_count
= sym_count
;
3493 if ((sec
->flags
& SEC_RELOC
) != 0)
3497 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3498 if (ext_size
> max_external_reloc_size
)
3499 max_external_reloc_size
= ext_size
;
3500 if (sec
->reloc_count
> max_internal_reloc_count
)
3501 max_internal_reloc_count
= sec
->reloc_count
;
3507 if (o
->reloc_count
> 0)
3508 o
->flags
|= SEC_RELOC
;
3511 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3512 set it (this is probably a bug) and if it is set
3513 assign_section_numbers will create a reloc section. */
3514 o
->flags
&=~ SEC_RELOC
;
3517 /* If the SEC_ALLOC flag is not set, force the section VMA to
3518 zero. This is done in elf_fake_sections as well, but forcing
3519 the VMA to 0 here will ensure that relocs against these
3520 sections are handled correctly. */
3521 if ((o
->flags
& SEC_ALLOC
) == 0
3522 && ! o
->user_set_vma
)
3526 /* Figure out the file positions for everything but the symbol table
3527 and the relocs. We set symcount to force assign_section_numbers
3528 to create a symbol table. */
3529 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3530 BFD_ASSERT (! abfd
->output_has_begun
);
3531 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3534 /* That created the reloc sections. Set their sizes, and assign
3535 them file positions, and allocate some buffers. */
3536 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3538 if ((o
->flags
& SEC_RELOC
) != 0)
3540 Elf_Internal_Shdr
*rel_hdr
;
3541 register struct elf_link_hash_entry
**p
, **pend
;
3543 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3545 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3547 /* The contents field must last into write_object_contents,
3548 so we allocate it with bfd_alloc rather than malloc. */
3549 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3550 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3553 p
= ((struct elf_link_hash_entry
**)
3554 bfd_malloc (o
->reloc_count
3555 * sizeof (struct elf_link_hash_entry
*)));
3556 if (p
== NULL
&& o
->reloc_count
!= 0)
3558 elf_section_data (o
)->rel_hashes
= p
;
3559 pend
= p
+ o
->reloc_count
;
3560 for (; p
< pend
; p
++)
3563 /* Use the reloc_count field as an index when outputting the
3569 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3571 /* We have now assigned file positions for all the sections except
3572 .symtab and .strtab. We start the .symtab section at the current
3573 file position, and write directly to it. We build the .strtab
3574 section in memory. */
3576 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3577 /* sh_name is set in prep_headers. */
3578 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3579 symtab_hdr
->sh_flags
= 0;
3580 symtab_hdr
->sh_addr
= 0;
3581 symtab_hdr
->sh_size
= 0;
3582 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3583 /* sh_link is set in assign_section_numbers. */
3584 /* sh_info is set below. */
3585 /* sh_offset is set just below. */
3586 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3588 off
= elf_tdata (abfd
)->next_file_pos
;
3589 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3591 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3592 incorrect. We do not yet know the size of the .symtab section.
3593 We correct next_file_pos below, after we do know the size. */
3595 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3596 continuously seeking to the right position in the file. */
3597 if (! info
->keep_memory
|| max_sym_count
< 20)
3598 finfo
.symbuf_size
= 20;
3600 finfo
.symbuf_size
= max_sym_count
;
3601 finfo
.symbuf
= ((Elf_External_Sym
*)
3602 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3603 if (finfo
.symbuf
== NULL
)
3606 /* Start writing out the symbol table. The first symbol is always a
3608 if (info
->strip
!= strip_all
|| info
->relocateable
)
3610 elfsym
.st_value
= 0;
3613 elfsym
.st_other
= 0;
3614 elfsym
.st_shndx
= SHN_UNDEF
;
3615 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3616 &elfsym
, bfd_und_section_ptr
))
3621 /* Some standard ELF linkers do this, but we don't because it causes
3622 bootstrap comparison failures. */
3623 /* Output a file symbol for the output file as the second symbol.
3624 We output this even if we are discarding local symbols, although
3625 I'm not sure if this is correct. */
3626 elfsym
.st_value
= 0;
3628 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3629 elfsym
.st_other
= 0;
3630 elfsym
.st_shndx
= SHN_ABS
;
3631 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3632 &elfsym
, bfd_abs_section_ptr
))
3636 /* Output a symbol for each section. We output these even if we are
3637 discarding local symbols, since they are used for relocs. These
3638 symbols have no names. We store the index of each one in the
3639 index field of the section, so that we can find it again when
3640 outputting relocs. */
3641 if (info
->strip
!= strip_all
|| info
->relocateable
)
3644 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3645 elfsym
.st_other
= 0;
3646 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3648 o
= section_from_elf_index (abfd
, i
);
3650 o
->target_index
= abfd
->symcount
;
3651 elfsym
.st_shndx
= i
;
3652 if (info
->relocateable
|| o
== NULL
)
3653 elfsym
.st_value
= 0;
3655 elfsym
.st_value
= o
->vma
;
3656 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3662 /* Allocate some memory to hold information read in from the input
3664 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3665 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3666 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3667 bfd_malloc (max_internal_reloc_count
3668 * sizeof (Elf_Internal_Rela
)));
3669 finfo
.external_syms
= ((Elf_External_Sym
*)
3670 bfd_malloc (max_sym_count
3671 * sizeof (Elf_External_Sym
)));
3672 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3673 bfd_malloc (max_sym_count
3674 * sizeof (Elf_Internal_Sym
)));
3675 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3676 finfo
.sections
= ((asection
**)
3677 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3678 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3679 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3680 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3681 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3682 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3683 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3684 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3687 /* Since ELF permits relocations to be against local symbols, we
3688 must have the local symbols available when we do the relocations.
3689 Since we would rather only read the local symbols once, and we
3690 would rather not keep them in memory, we handle all the
3691 relocations for a single input file at the same time.
3693 Unfortunately, there is no way to know the total number of local
3694 symbols until we have seen all of them, and the local symbol
3695 indices precede the global symbol indices. This means that when
3696 we are generating relocateable output, and we see a reloc against
3697 a global symbol, we can not know the symbol index until we have
3698 finished examining all the local symbols to see which ones we are
3699 going to output. To deal with this, we keep the relocations in
3700 memory, and don't output them until the end of the link. This is
3701 an unfortunate waste of memory, but I don't see a good way around
3702 it. Fortunately, it only happens when performing a relocateable
3703 link, which is not the common case. FIXME: If keep_memory is set
3704 we could write the relocs out and then read them again; I don't
3705 know how bad the memory loss will be. */
3707 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3708 sub
->output_has_begun
= false;
3709 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3711 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3713 if (p
->type
== bfd_indirect_link_order
3714 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3715 == bfd_target_elf_flavour
))
3717 sub
= p
->u
.indirect
.section
->owner
;
3718 if (! sub
->output_has_begun
)
3720 if (! elf_link_input_bfd (&finfo
, sub
))
3722 sub
->output_has_begun
= true;
3725 else if (p
->type
== bfd_section_reloc_link_order
3726 || p
->type
== bfd_symbol_reloc_link_order
)
3728 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3733 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3739 /* That wrote out all the local symbols. Finish up the symbol table
3740 with the global symbols. */
3742 if (info
->strip
!= strip_all
&& info
->shared
)
3744 /* Output any global symbols that got converted to local in a
3745 version script. We do this in a separate step since ELF
3746 requires all local symbols to appear prior to any global
3747 symbols. FIXME: We should only do this if some global
3748 symbols were, in fact, converted to become local. FIXME:
3749 Will this work correctly with the Irix 5 linker? */
3750 eoinfo
.failed
= false;
3751 eoinfo
.finfo
= &finfo
;
3752 eoinfo
.localsyms
= true;
3753 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3759 /* The sh_info field records the index of the first non local
3761 symtab_hdr
->sh_info
= abfd
->symcount
;
3763 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3765 /* We get the global symbols from the hash table. */
3766 eoinfo
.failed
= false;
3767 eoinfo
.localsyms
= false;
3768 eoinfo
.finfo
= &finfo
;
3769 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3774 /* Flush all symbols to the file. */
3775 if (! elf_link_flush_output_syms (&finfo
))
3778 /* Now we know the size of the symtab section. */
3779 off
+= symtab_hdr
->sh_size
;
3781 /* Finish up and write out the symbol string table (.strtab)
3783 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3784 /* sh_name was set in prep_headers. */
3785 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3786 symstrtab_hdr
->sh_flags
= 0;
3787 symstrtab_hdr
->sh_addr
= 0;
3788 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3789 symstrtab_hdr
->sh_entsize
= 0;
3790 symstrtab_hdr
->sh_link
= 0;
3791 symstrtab_hdr
->sh_info
= 0;
3792 /* sh_offset is set just below. */
3793 symstrtab_hdr
->sh_addralign
= 1;
3795 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3796 elf_tdata (abfd
)->next_file_pos
= off
;
3798 if (abfd
->symcount
> 0)
3800 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3801 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3805 /* Adjust the relocs to have the correct symbol indices. */
3806 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3808 struct elf_link_hash_entry
**rel_hash
;
3809 Elf_Internal_Shdr
*rel_hdr
;
3811 if ((o
->flags
& SEC_RELOC
) == 0)
3814 rel_hash
= elf_section_data (o
)->rel_hashes
;
3815 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3816 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3818 if (*rel_hash
== NULL
)
3821 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3823 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3825 Elf_External_Rel
*erel
;
3826 Elf_Internal_Rel irel
;
3828 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3829 elf_swap_reloc_in (abfd
, erel
, &irel
);
3830 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3831 ELF_R_TYPE (irel
.r_info
));
3832 elf_swap_reloc_out (abfd
, &irel
, erel
);
3836 Elf_External_Rela
*erela
;
3837 Elf_Internal_Rela irela
;
3839 BFD_ASSERT (rel_hdr
->sh_entsize
3840 == sizeof (Elf_External_Rela
));
3842 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3843 elf_swap_reloca_in (abfd
, erela
, &irela
);
3844 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3845 ELF_R_TYPE (irela
.r_info
));
3846 elf_swap_reloca_out (abfd
, &irela
, erela
);
3850 /* Set the reloc_count field to 0 to prevent write_relocs from
3851 trying to swap the relocs out itself. */
3855 /* If we are linking against a dynamic object, or generating a
3856 shared library, finish up the dynamic linking information. */
3859 Elf_External_Dyn
*dyncon
, *dynconend
;
3861 /* Fix up .dynamic entries. */
3862 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3863 BFD_ASSERT (o
!= NULL
);
3865 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3866 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3867 for (; dyncon
< dynconend
; dyncon
++)
3869 Elf_Internal_Dyn dyn
;
3873 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3880 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3881 magic _init and _fini symbols. This is pretty ugly,
3882 but we are compatible. */
3890 struct elf_link_hash_entry
*h
;
3892 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3893 false, false, true);
3895 && (h
->root
.type
== bfd_link_hash_defined
3896 || h
->root
.type
== bfd_link_hash_defweak
))
3898 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3899 o
= h
->root
.u
.def
.section
;
3900 if (o
->output_section
!= NULL
)
3901 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3902 + o
->output_offset
);
3905 /* The symbol is imported from another shared
3906 library and does not apply to this one. */
3910 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3925 name
= ".gnu.version_d";
3928 name
= ".gnu.version_r";
3931 name
= ".gnu.version";
3933 o
= bfd_get_section_by_name (abfd
, name
);
3934 BFD_ASSERT (o
!= NULL
);
3935 dyn
.d_un
.d_ptr
= o
->vma
;
3936 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3943 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3948 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3950 Elf_Internal_Shdr
*hdr
;
3952 hdr
= elf_elfsections (abfd
)[i
];
3953 if (hdr
->sh_type
== type
3954 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3956 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3957 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3960 if (dyn
.d_un
.d_val
== 0
3961 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3962 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3966 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3972 /* If we have created any dynamic sections, then output them. */
3975 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3978 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3980 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3981 || o
->_raw_size
== 0)
3983 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3985 /* At this point, we are only interested in sections
3986 created by elf_link_create_dynamic_sections. */
3989 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
3991 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
3993 if (! bfd_set_section_contents (abfd
, o
->output_section
,
3994 o
->contents
, o
->output_offset
,
4002 /* The contents of the .dynstr section are actually in a
4004 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4005 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4006 || ! _bfd_stringtab_emit (abfd
,
4007 elf_hash_table (info
)->dynstr
))
4013 /* If we have optimized stabs strings, output them. */
4014 if (elf_hash_table (info
)->stab_info
!= NULL
)
4016 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4020 if (finfo
.symstrtab
!= NULL
)
4021 _bfd_stringtab_free (finfo
.symstrtab
);
4022 if (finfo
.contents
!= NULL
)
4023 free (finfo
.contents
);
4024 if (finfo
.external_relocs
!= NULL
)
4025 free (finfo
.external_relocs
);
4026 if (finfo
.internal_relocs
!= NULL
)
4027 free (finfo
.internal_relocs
);
4028 if (finfo
.external_syms
!= NULL
)
4029 free (finfo
.external_syms
);
4030 if (finfo
.internal_syms
!= NULL
)
4031 free (finfo
.internal_syms
);
4032 if (finfo
.indices
!= NULL
)
4033 free (finfo
.indices
);
4034 if (finfo
.sections
!= NULL
)
4035 free (finfo
.sections
);
4036 if (finfo
.symbuf
!= NULL
)
4037 free (finfo
.symbuf
);
4038 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4040 if ((o
->flags
& SEC_RELOC
) != 0
4041 && elf_section_data (o
)->rel_hashes
!= NULL
)
4042 free (elf_section_data (o
)->rel_hashes
);
4045 elf_tdata (abfd
)->linker
= true;
4050 if (finfo
.symstrtab
!= NULL
)
4051 _bfd_stringtab_free (finfo
.symstrtab
);
4052 if (finfo
.contents
!= NULL
)
4053 free (finfo
.contents
);
4054 if (finfo
.external_relocs
!= NULL
)
4055 free (finfo
.external_relocs
);
4056 if (finfo
.internal_relocs
!= NULL
)
4057 free (finfo
.internal_relocs
);
4058 if (finfo
.external_syms
!= NULL
)
4059 free (finfo
.external_syms
);
4060 if (finfo
.internal_syms
!= NULL
)
4061 free (finfo
.internal_syms
);
4062 if (finfo
.indices
!= NULL
)
4063 free (finfo
.indices
);
4064 if (finfo
.sections
!= NULL
)
4065 free (finfo
.sections
);
4066 if (finfo
.symbuf
!= NULL
)
4067 free (finfo
.symbuf
);
4068 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4070 if ((o
->flags
& SEC_RELOC
) != 0
4071 && elf_section_data (o
)->rel_hashes
!= NULL
)
4072 free (elf_section_data (o
)->rel_hashes
);
4078 /* Add a symbol to the output symbol table. */
4081 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4082 struct elf_final_link_info
*finfo
;
4084 Elf_Internal_Sym
*elfsym
;
4085 asection
*input_sec
;
4087 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4088 struct bfd_link_info
*info
,
4093 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4094 elf_backend_link_output_symbol_hook
;
4095 if (output_symbol_hook
!= NULL
)
4097 if (! ((*output_symbol_hook
)
4098 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4102 if (name
== (const char *) NULL
|| *name
== '\0')
4103 elfsym
->st_name
= 0;
4106 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4109 if (elfsym
->st_name
== (unsigned long) -1)
4113 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4115 if (! elf_link_flush_output_syms (finfo
))
4119 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4120 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4121 ++finfo
->symbuf_count
;
4123 ++finfo
->output_bfd
->symcount
;
4128 /* Flush the output symbols to the file. */
4131 elf_link_flush_output_syms (finfo
)
4132 struct elf_final_link_info
*finfo
;
4134 if (finfo
->symbuf_count
> 0)
4136 Elf_Internal_Shdr
*symtab
;
4138 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4140 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4142 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4143 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4144 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4147 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4149 finfo
->symbuf_count
= 0;
4155 /* Add an external symbol to the symbol table. This is called from
4156 the hash table traversal routine. When generating a shared object,
4157 we go through the symbol table twice. The first time we output
4158 anything that might have been forced to local scope in a version
4159 script. The second time we output the symbols that are still
4163 elf_link_output_extsym (h
, data
)
4164 struct elf_link_hash_entry
*h
;
4167 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4168 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4170 Elf_Internal_Sym sym
;
4171 asection
*input_sec
;
4173 /* Decide whether to output this symbol in this pass. */
4174 if (eoinfo
->localsyms
)
4176 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4181 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4185 /* If we are not creating a shared library, and this symbol is
4186 referenced by a shared library but is not defined anywhere, then
4187 warn that it is undefined. If we do not do this, the runtime
4188 linker will complain that the symbol is undefined when the
4189 program is run. We don't have to worry about symbols that are
4190 referenced by regular files, because we will already have issued
4191 warnings for them. */
4192 if (! finfo
->info
->relocateable
4193 && ! finfo
->info
->shared
4194 && h
->root
.type
== bfd_link_hash_undefined
4195 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4196 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4198 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4199 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4200 (asection
*) NULL
, 0)))
4202 eoinfo
->failed
= true;
4207 /* We don't want to output symbols that have never been mentioned by
4208 a regular file, or that we have been told to strip. However, if
4209 h->indx is set to -2, the symbol is used by a reloc and we must
4213 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4214 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4215 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4216 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4218 else if (finfo
->info
->strip
== strip_all
4219 || (finfo
->info
->strip
== strip_some
4220 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4221 h
->root
.root
.string
,
4222 false, false) == NULL
))
4227 /* If we're stripping it, and it's not a dynamic symbol, there's
4228 nothing else to do. */
4229 if (strip
&& h
->dynindx
== -1)
4233 sym
.st_size
= h
->size
;
4234 sym
.st_other
= h
->other
;
4235 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4236 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4237 else if (h
->root
.type
== bfd_link_hash_undefweak
4238 || h
->root
.type
== bfd_link_hash_defweak
)
4239 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4241 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4243 switch (h
->root
.type
)
4246 case bfd_link_hash_new
:
4250 case bfd_link_hash_undefined
:
4251 input_sec
= bfd_und_section_ptr
;
4252 sym
.st_shndx
= SHN_UNDEF
;
4255 case bfd_link_hash_undefweak
:
4256 input_sec
= bfd_und_section_ptr
;
4257 sym
.st_shndx
= SHN_UNDEF
;
4260 case bfd_link_hash_defined
:
4261 case bfd_link_hash_defweak
:
4263 input_sec
= h
->root
.u
.def
.section
;
4264 if (input_sec
->output_section
!= NULL
)
4267 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4268 input_sec
->output_section
);
4269 if (sym
.st_shndx
== (unsigned short) -1)
4271 eoinfo
->failed
= true;
4275 /* ELF symbols in relocateable files are section relative,
4276 but in nonrelocateable files they are virtual
4278 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4279 if (! finfo
->info
->relocateable
)
4280 sym
.st_value
+= input_sec
->output_section
->vma
;
4284 BFD_ASSERT (input_sec
->owner
== NULL
4285 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4286 sym
.st_shndx
= SHN_UNDEF
;
4287 input_sec
= bfd_und_section_ptr
;
4292 case bfd_link_hash_common
:
4293 input_sec
= h
->root
.u
.c
.p
->section
;
4294 sym
.st_shndx
= SHN_COMMON
;
4295 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4298 case bfd_link_hash_indirect
:
4299 /* These symbols are created by symbol versioning. They point
4300 to the decorated version of the name. For example, if the
4301 symbol foo@@GNU_1.2 is the default, which should be used when
4302 foo is used with no version, then we add an indirect symbol
4303 foo which points to foo@@GNU_1.2. We ignore these symbols,
4304 since the indirected symbol is already in the hash table. If
4305 the indirect symbol is non-ELF, fall through and output it. */
4306 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4310 case bfd_link_hash_warning
:
4311 /* We can't represent these symbols in ELF, although a warning
4312 symbol may have come from a .gnu.warning.SYMBOL section. We
4313 just put the target symbol in the hash table. If the target
4314 symbol does not really exist, don't do anything. */
4315 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4317 return (elf_link_output_extsym
4318 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4321 /* Give the processor backend a chance to tweak the symbol value,
4322 and also to finish up anything that needs to be done for this
4324 if ((h
->dynindx
!= -1
4325 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4326 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4328 struct elf_backend_data
*bed
;
4330 bed
= get_elf_backend_data (finfo
->output_bfd
);
4331 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4332 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4334 eoinfo
->failed
= true;
4339 /* If this symbol should be put in the .dynsym section, then put it
4340 there now. We have already know the symbol index. We also fill
4341 in the entry in the .hash section. */
4342 if (h
->dynindx
!= -1
4343 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4349 bfd_byte
*bucketpos
;
4352 sym
.st_name
= h
->dynstr_index
;
4354 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4355 (PTR
) (((Elf_External_Sym
*)
4356 finfo
->dynsym_sec
->contents
)
4359 /* We didn't include the version string in the dynamic string
4360 table, so we must not consider it in the hash table. */
4361 name
= h
->root
.root
.string
;
4362 p
= strchr (name
, ELF_VER_CHR
);
4367 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4368 strncpy (copy
, name
, p
- name
);
4369 copy
[p
- name
] = '\0';
4373 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4374 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4375 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4376 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4377 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4378 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4379 put_word (finfo
->output_bfd
, chain
,
4380 ((bfd_byte
*) finfo
->hash_sec
->contents
4381 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4384 bfd_release (finfo
->output_bfd
, copy
);
4386 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4388 Elf_Internal_Versym iversym
;
4390 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4392 if (h
->verinfo
.verdef
== NULL
)
4393 iversym
.vs_vers
= 0;
4395 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4399 if (h
->verinfo
.vertree
== NULL
)
4400 iversym
.vs_vers
= 1;
4402 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4405 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4406 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4408 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4409 (((Elf_External_Versym
*)
4410 finfo
->symver_sec
->contents
)
4415 /* If we're stripping it, then it was just a dynamic symbol, and
4416 there's nothing else to do. */
4420 h
->indx
= finfo
->output_bfd
->symcount
;
4422 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4424 eoinfo
->failed
= true;
4431 /* Link an input file into the linker output file. This function
4432 handles all the sections and relocations of the input file at once.
4433 This is so that we only have to read the local symbols once, and
4434 don't have to keep them in memory. */
4437 elf_link_input_bfd (finfo
, input_bfd
)
4438 struct elf_final_link_info
*finfo
;
4441 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4442 bfd
*, asection
*, bfd_byte
*,
4443 Elf_Internal_Rela
*,
4444 Elf_Internal_Sym
*, asection
**));
4446 Elf_Internal_Shdr
*symtab_hdr
;
4449 Elf_External_Sym
*external_syms
;
4450 Elf_External_Sym
*esym
;
4451 Elf_External_Sym
*esymend
;
4452 Elf_Internal_Sym
*isym
;
4454 asection
**ppsection
;
4457 output_bfd
= finfo
->output_bfd
;
4459 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4461 /* If this is a dynamic object, we don't want to do anything here:
4462 we don't want the local symbols, and we don't want the section
4464 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4467 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4468 if (elf_bad_symtab (input_bfd
))
4470 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4475 locsymcount
= symtab_hdr
->sh_info
;
4476 extsymoff
= symtab_hdr
->sh_info
;
4479 /* Read the local symbols. */
4480 if (symtab_hdr
->contents
!= NULL
)
4481 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4482 else if (locsymcount
== 0)
4483 external_syms
= NULL
;
4486 external_syms
= finfo
->external_syms
;
4487 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4488 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4489 locsymcount
, input_bfd
)
4490 != locsymcount
* sizeof (Elf_External_Sym
)))
4494 /* Swap in the local symbols and write out the ones which we know
4495 are going into the output file. */
4496 esym
= external_syms
;
4497 esymend
= esym
+ locsymcount
;
4498 isym
= finfo
->internal_syms
;
4499 pindex
= finfo
->indices
;
4500 ppsection
= finfo
->sections
;
4501 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4505 Elf_Internal_Sym osym
;
4507 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4510 if (elf_bad_symtab (input_bfd
))
4512 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4519 if (isym
->st_shndx
== SHN_UNDEF
)
4520 isec
= bfd_und_section_ptr
;
4521 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4522 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4523 else if (isym
->st_shndx
== SHN_ABS
)
4524 isec
= bfd_abs_section_ptr
;
4525 else if (isym
->st_shndx
== SHN_COMMON
)
4526 isec
= bfd_com_section_ptr
;
4535 /* Don't output the first, undefined, symbol. */
4536 if (esym
== external_syms
)
4539 /* If we are stripping all symbols, we don't want to output this
4541 if (finfo
->info
->strip
== strip_all
)
4544 /* We never output section symbols. Instead, we use the section
4545 symbol of the corresponding section in the output file. */
4546 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4549 /* If we are discarding all local symbols, we don't want to
4550 output this one. If we are generating a relocateable output
4551 file, then some of the local symbols may be required by
4552 relocs; we output them below as we discover that they are
4554 if (finfo
->info
->discard
== discard_all
)
4557 /* If this symbol is defined in a section which we are
4558 discarding, we don't need to keep it, but note that
4559 linker_mark is only reliable for sections that have contents.
4560 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4561 as well as linker_mark. */
4562 if (isym
->st_shndx
> 0
4563 && isym
->st_shndx
< SHN_LORESERVE
4565 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4566 || (! finfo
->info
->relocateable
4567 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4570 /* Get the name of the symbol. */
4571 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4576 /* See if we are discarding symbols with this name. */
4577 if ((finfo
->info
->strip
== strip_some
4578 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4580 || (finfo
->info
->discard
== discard_l
4581 && bfd_is_local_label_name (input_bfd
, name
)))
4584 /* If we get here, we are going to output this symbol. */
4588 /* Adjust the section index for the output file. */
4589 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4590 isec
->output_section
);
4591 if (osym
.st_shndx
== (unsigned short) -1)
4594 *pindex
= output_bfd
->symcount
;
4596 /* ELF symbols in relocateable files are section relative, but
4597 in executable files they are virtual addresses. Note that
4598 this code assumes that all ELF sections have an associated
4599 BFD section with a reasonable value for output_offset; below
4600 we assume that they also have a reasonable value for
4601 output_section. Any special sections must be set up to meet
4602 these requirements. */
4603 osym
.st_value
+= isec
->output_offset
;
4604 if (! finfo
->info
->relocateable
)
4605 osym
.st_value
+= isec
->output_section
->vma
;
4607 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4611 /* Relocate the contents of each section. */
4612 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4616 if (! o
->linker_mark
)
4618 /* This section was omitted from the link. */
4622 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4623 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4626 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4628 /* Section was created by elf_link_create_dynamic_sections
4633 /* Get the contents of the section. They have been cached by a
4634 relaxation routine. Note that o is a section in an input
4635 file, so the contents field will not have been set by any of
4636 the routines which work on output files. */
4637 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4638 contents
= elf_section_data (o
)->this_hdr
.contents
;
4641 contents
= finfo
->contents
;
4642 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4643 (file_ptr
) 0, o
->_raw_size
))
4647 if ((o
->flags
& SEC_RELOC
) != 0)
4649 Elf_Internal_Rela
*internal_relocs
;
4651 /* Get the swapped relocs. */
4652 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4653 (input_bfd
, o
, finfo
->external_relocs
,
4654 finfo
->internal_relocs
, false));
4655 if (internal_relocs
== NULL
4656 && o
->reloc_count
> 0)
4659 /* Relocate the section by invoking a back end routine.
4661 The back end routine is responsible for adjusting the
4662 section contents as necessary, and (if using Rela relocs
4663 and generating a relocateable output file) adjusting the
4664 reloc addend as necessary.
4666 The back end routine does not have to worry about setting
4667 the reloc address or the reloc symbol index.
4669 The back end routine is given a pointer to the swapped in
4670 internal symbols, and can access the hash table entries
4671 for the external symbols via elf_sym_hashes (input_bfd).
4673 When generating relocateable output, the back end routine
4674 must handle STB_LOCAL/STT_SECTION symbols specially. The
4675 output symbol is going to be a section symbol
4676 corresponding to the output section, which will require
4677 the addend to be adjusted. */
4679 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4680 input_bfd
, o
, contents
,
4682 finfo
->internal_syms
,
4686 if (finfo
->info
->relocateable
)
4688 Elf_Internal_Rela
*irela
;
4689 Elf_Internal_Rela
*irelaend
;
4690 struct elf_link_hash_entry
**rel_hash
;
4691 Elf_Internal_Shdr
*input_rel_hdr
;
4692 Elf_Internal_Shdr
*output_rel_hdr
;
4694 /* Adjust the reloc addresses and symbol indices. */
4696 irela
= internal_relocs
;
4697 irelaend
= irela
+ o
->reloc_count
;
4698 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4699 + o
->output_section
->reloc_count
);
4700 for (; irela
< irelaend
; irela
++, rel_hash
++)
4702 unsigned long r_symndx
;
4703 Elf_Internal_Sym
*isym
;
4706 irela
->r_offset
+= o
->output_offset
;
4708 r_symndx
= ELF_R_SYM (irela
->r_info
);
4713 if (r_symndx
>= locsymcount
4714 || (elf_bad_symtab (input_bfd
)
4715 && finfo
->sections
[r_symndx
] == NULL
))
4719 /* This is a reloc against a global symbol. We
4720 have not yet output all the local symbols, so
4721 we do not know the symbol index of any global
4722 symbol. We set the rel_hash entry for this
4723 reloc to point to the global hash table entry
4724 for this symbol. The symbol index is then
4725 set at the end of elf_bfd_final_link. */
4726 indx
= r_symndx
- extsymoff
;
4727 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4729 /* Setting the index to -2 tells
4730 elf_link_output_extsym that this symbol is
4732 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4733 (*rel_hash
)->indx
= -2;
4738 /* This is a reloc against a local symbol. */
4741 isym
= finfo
->internal_syms
+ r_symndx
;
4742 sec
= finfo
->sections
[r_symndx
];
4743 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4745 /* I suppose the backend ought to fill in the
4746 section of any STT_SECTION symbol against a
4747 processor specific section. If we have
4748 discarded a section, the output_section will
4749 be the absolute section. */
4751 && (bfd_is_abs_section (sec
)
4752 || (sec
->output_section
!= NULL
4753 && bfd_is_abs_section (sec
->output_section
))))
4755 else if (sec
== NULL
|| sec
->owner
== NULL
)
4757 bfd_set_error (bfd_error_bad_value
);
4762 r_symndx
= sec
->output_section
->target_index
;
4763 BFD_ASSERT (r_symndx
!= 0);
4768 if (finfo
->indices
[r_symndx
] == -1)
4774 if (finfo
->info
->strip
== strip_all
)
4776 /* You can't do ld -r -s. */
4777 bfd_set_error (bfd_error_invalid_operation
);
4781 /* This symbol was skipped earlier, but
4782 since it is needed by a reloc, we
4783 must output it now. */
4784 link
= symtab_hdr
->sh_link
;
4785 name
= bfd_elf_string_from_elf_section (input_bfd
,
4791 osec
= sec
->output_section
;
4793 _bfd_elf_section_from_bfd_section (output_bfd
,
4795 if (isym
->st_shndx
== (unsigned short) -1)
4798 isym
->st_value
+= sec
->output_offset
;
4799 if (! finfo
->info
->relocateable
)
4800 isym
->st_value
+= osec
->vma
;
4802 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4804 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4808 r_symndx
= finfo
->indices
[r_symndx
];
4811 irela
->r_info
= ELF_R_INFO (r_symndx
,
4812 ELF_R_TYPE (irela
->r_info
));
4815 /* Swap out the relocs. */
4816 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4817 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4818 BFD_ASSERT (output_rel_hdr
->sh_entsize
4819 == input_rel_hdr
->sh_entsize
);
4820 irela
= internal_relocs
;
4821 irelaend
= irela
+ o
->reloc_count
;
4822 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4824 Elf_External_Rel
*erel
;
4826 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4827 + o
->output_section
->reloc_count
);
4828 for (; irela
< irelaend
; irela
++, erel
++)
4830 Elf_Internal_Rel irel
;
4832 irel
.r_offset
= irela
->r_offset
;
4833 irel
.r_info
= irela
->r_info
;
4834 BFD_ASSERT (irela
->r_addend
== 0);
4835 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4840 Elf_External_Rela
*erela
;
4842 BFD_ASSERT (input_rel_hdr
->sh_entsize
4843 == sizeof (Elf_External_Rela
));
4844 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4845 + o
->output_section
->reloc_count
);
4846 for (; irela
< irelaend
; irela
++, erela
++)
4847 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4850 o
->output_section
->reloc_count
+= o
->reloc_count
;
4854 /* Write out the modified section contents. */
4855 if (elf_section_data (o
)->stab_info
== NULL
)
4857 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4858 contents
, o
->output_offset
,
4859 (o
->_cooked_size
!= 0
4866 if (! (_bfd_write_section_stabs
4867 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4868 o
, &elf_section_data (o
)->stab_info
, contents
)))
4876 /* Generate a reloc when linking an ELF file. This is a reloc
4877 requested by the linker, and does come from any input file. This
4878 is used to build constructor and destructor tables when linking
4882 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4884 struct bfd_link_info
*info
;
4885 asection
*output_section
;
4886 struct bfd_link_order
*link_order
;
4888 reloc_howto_type
*howto
;
4892 struct elf_link_hash_entry
**rel_hash_ptr
;
4893 Elf_Internal_Shdr
*rel_hdr
;
4895 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4898 bfd_set_error (bfd_error_bad_value
);
4902 addend
= link_order
->u
.reloc
.p
->addend
;
4904 /* Figure out the symbol index. */
4905 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4906 + output_section
->reloc_count
);
4907 if (link_order
->type
== bfd_section_reloc_link_order
)
4909 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4910 BFD_ASSERT (indx
!= 0);
4911 *rel_hash_ptr
= NULL
;
4915 struct elf_link_hash_entry
*h
;
4917 /* Treat a reloc against a defined symbol as though it were
4918 actually against the section. */
4919 h
= ((struct elf_link_hash_entry
*)
4920 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4921 link_order
->u
.reloc
.p
->u
.name
,
4922 false, false, true));
4924 && (h
->root
.type
== bfd_link_hash_defined
4925 || h
->root
.type
== bfd_link_hash_defweak
))
4929 section
= h
->root
.u
.def
.section
;
4930 indx
= section
->output_section
->target_index
;
4931 *rel_hash_ptr
= NULL
;
4932 /* It seems that we ought to add the symbol value to the
4933 addend here, but in practice it has already been added
4934 because it was passed to constructor_callback. */
4935 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4939 /* Setting the index to -2 tells elf_link_output_extsym that
4940 this symbol is used by a reloc. */
4947 if (! ((*info
->callbacks
->unattached_reloc
)
4948 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4949 (asection
*) NULL
, (bfd_vma
) 0)))
4955 /* If this is an inplace reloc, we must write the addend into the
4957 if (howto
->partial_inplace
&& addend
!= 0)
4960 bfd_reloc_status_type rstat
;
4964 size
= bfd_get_reloc_size (howto
);
4965 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4966 if (buf
== (bfd_byte
*) NULL
)
4968 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4974 case bfd_reloc_outofrange
:
4976 case bfd_reloc_overflow
:
4977 if (! ((*info
->callbacks
->reloc_overflow
)
4979 (link_order
->type
== bfd_section_reloc_link_order
4980 ? bfd_section_name (output_bfd
,
4981 link_order
->u
.reloc
.p
->u
.section
)
4982 : link_order
->u
.reloc
.p
->u
.name
),
4983 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
4991 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
4992 (file_ptr
) link_order
->offset
, size
);
4998 /* The address of a reloc is relative to the section in a
4999 relocateable file, and is a virtual address in an executable
5001 offset
= link_order
->offset
;
5002 if (! info
->relocateable
)
5003 offset
+= output_section
->vma
;
5005 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5007 if (rel_hdr
->sh_type
== SHT_REL
)
5009 Elf_Internal_Rel irel
;
5010 Elf_External_Rel
*erel
;
5012 irel
.r_offset
= offset
;
5013 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5014 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5015 + output_section
->reloc_count
);
5016 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5020 Elf_Internal_Rela irela
;
5021 Elf_External_Rela
*erela
;
5023 irela
.r_offset
= offset
;
5024 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5025 irela
.r_addend
= addend
;
5026 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5027 + output_section
->reloc_count
);
5028 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5031 ++output_section
->reloc_count
;
5037 /* Allocate a pointer to live in a linker created section. */
5040 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5042 struct bfd_link_info
*info
;
5043 elf_linker_section_t
*lsect
;
5044 struct elf_link_hash_entry
*h
;
5045 const Elf_Internal_Rela
*rel
;
5047 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5048 elf_linker_section_pointers_t
*linker_section_ptr
;
5049 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5051 BFD_ASSERT (lsect
!= NULL
);
5053 /* Is this a global symbol? */
5056 /* Has this symbol already been allocated, if so, our work is done */
5057 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5062 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5063 /* Make sure this symbol is output as a dynamic symbol. */
5064 if (h
->dynindx
== -1)
5066 if (! elf_link_record_dynamic_symbol (info
, h
))
5070 if (lsect
->rel_section
)
5071 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5074 else /* Allocation of a pointer to a local symbol */
5076 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5078 /* Allocate a table to hold the local symbols if first time */
5081 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5082 register unsigned int i
;
5084 ptr
= (elf_linker_section_pointers_t
**)
5085 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5090 elf_local_ptr_offsets (abfd
) = ptr
;
5091 for (i
= 0; i
< num_symbols
; i
++)
5092 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5095 /* Has this symbol already been allocated, if so, our work is done */
5096 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5101 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5105 /* If we are generating a shared object, we need to
5106 output a R_<xxx>_RELATIVE reloc so that the
5107 dynamic linker can adjust this GOT entry. */
5108 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5109 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5113 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5114 from internal memory. */
5115 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5116 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5117 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5119 if (!linker_section_ptr
)
5122 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5123 linker_section_ptr
->addend
= rel
->r_addend
;
5124 linker_section_ptr
->which
= lsect
->which
;
5125 linker_section_ptr
->written_address_p
= false;
5126 *ptr_linker_section_ptr
= linker_section_ptr
;
5129 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5131 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5132 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5133 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5134 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5136 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5138 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5139 lsect
->sym_hash
->root
.root
.string
,
5140 (long)ARCH_SIZE
/ 8,
5141 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5147 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5149 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5152 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5153 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5161 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5164 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5167 /* Fill in the address for a pointer generated in alinker section. */
5170 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5173 struct bfd_link_info
*info
;
5174 elf_linker_section_t
*lsect
;
5175 struct elf_link_hash_entry
*h
;
5177 const Elf_Internal_Rela
*rel
;
5180 elf_linker_section_pointers_t
*linker_section_ptr
;
5182 BFD_ASSERT (lsect
!= NULL
);
5184 if (h
!= NULL
) /* global symbol */
5186 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5190 BFD_ASSERT (linker_section_ptr
!= NULL
);
5192 if (! elf_hash_table (info
)->dynamic_sections_created
5195 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5197 /* This is actually a static link, or it is a
5198 -Bsymbolic link and the symbol is defined
5199 locally. We must initialize this entry in the
5202 When doing a dynamic link, we create a .rela.<xxx>
5203 relocation entry to initialize the value. This
5204 is done in the finish_dynamic_symbol routine. */
5205 if (!linker_section_ptr
->written_address_p
)
5207 linker_section_ptr
->written_address_p
= true;
5208 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5209 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5213 else /* local symbol */
5215 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5216 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5217 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5218 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5222 BFD_ASSERT (linker_section_ptr
!= NULL
);
5224 /* Write out pointer if it hasn't been rewritten out before */
5225 if (!linker_section_ptr
->written_address_p
)
5227 linker_section_ptr
->written_address_p
= true;
5228 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5229 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5233 asection
*srel
= lsect
->rel_section
;
5234 Elf_Internal_Rela outrel
;
5236 /* We need to generate a relative reloc for the dynamic linker. */
5238 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5241 BFD_ASSERT (srel
!= NULL
);
5243 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5244 + lsect
->section
->output_offset
5245 + linker_section_ptr
->offset
);
5246 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5247 outrel
.r_addend
= 0;
5248 elf_swap_reloca_out (output_bfd
, &outrel
,
5249 (((Elf_External_Rela
*)
5250 lsect
->section
->contents
)
5251 + lsect
->section
->reloc_count
));
5252 ++lsect
->section
->reloc_count
;
5257 relocation
= (lsect
->section
->output_offset
5258 + linker_section_ptr
->offset
5259 - lsect
->hole_offset
5260 - lsect
->sym_offset
);
5263 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5264 lsect
->name
, (long)relocation
, (long)relocation
);
5267 /* Subtract out the addend, because it will get added back in by the normal
5269 return relocation
- linker_section_ptr
->addend
;