2 Copyright 1995, 1996, 1997, 1998, 1999 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_collect_hash_codes
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
53 static boolean elf_link_read_relocs_from_section
54 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
55 static void elf_link_output_relocs
56 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
57 static boolean elf_link_size_reloc_section
58 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
59 static void elf_link_adjust_relocs
60 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
61 struct elf_link_hash_entry
**));
63 /* Given an ELF BFD, add symbols to the global hash table as
67 elf_bfd_link_add_symbols (abfd
, info
)
69 struct bfd_link_info
*info
;
71 switch (bfd_get_format (abfd
))
74 return elf_link_add_object_symbols (abfd
, info
);
76 return elf_link_add_archive_symbols (abfd
, info
);
78 bfd_set_error (bfd_error_wrong_format
);
84 /* Add symbols from an ELF archive file to the linker hash table. We
85 don't use _bfd_generic_link_add_archive_symbols because of a
86 problem which arises on UnixWare. The UnixWare libc.so is an
87 archive which includes an entry libc.so.1 which defines a bunch of
88 symbols. The libc.so archive also includes a number of other
89 object files, which also define symbols, some of which are the same
90 as those defined in libc.so.1. Correct linking requires that we
91 consider each object file in turn, and include it if it defines any
92 symbols we need. _bfd_generic_link_add_archive_symbols does not do
93 this; it looks through the list of undefined symbols, and includes
94 any object file which defines them. When this algorithm is used on
95 UnixWare, it winds up pulling in libc.so.1 early and defining a
96 bunch of symbols. This means that some of the other objects in the
97 archive are not included in the link, which is incorrect since they
98 precede libc.so.1 in the archive.
100 Fortunately, ELF archive handling is simpler than that done by
101 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
102 oddities. In ELF, if we find a symbol in the archive map, and the
103 symbol is currently undefined, we know that we must pull in that
106 Unfortunately, we do have to make multiple passes over the symbol
107 table until nothing further is resolved. */
110 elf_link_add_archive_symbols (abfd
, info
)
112 struct bfd_link_info
*info
;
115 boolean
*defined
= NULL
;
116 boolean
*included
= NULL
;
120 if (! bfd_has_map (abfd
))
122 /* An empty archive is a special case. */
123 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
125 bfd_set_error (bfd_error_no_armap
);
129 /* Keep track of all symbols we know to be already defined, and all
130 files we know to be already included. This is to speed up the
131 second and subsequent passes. */
132 c
= bfd_ardata (abfd
)->symdef_count
;
135 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
136 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
137 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
139 memset (defined
, 0, c
* sizeof (boolean
));
140 memset (included
, 0, c
* sizeof (boolean
));
142 symdefs
= bfd_ardata (abfd
)->symdefs
;
155 symdefend
= symdef
+ c
;
156 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
158 struct elf_link_hash_entry
*h
;
160 struct bfd_link_hash_entry
*undefs_tail
;
163 if (defined
[i
] || included
[i
])
165 if (symdef
->file_offset
== last
)
171 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
172 false, false, false);
178 /* If this is a default version (the name contains @@),
179 look up the symbol again without the version. The
180 effect is that references to the symbol without the
181 version will be matched by the default symbol in the
184 p
= strchr (symdef
->name
, ELF_VER_CHR
);
185 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
188 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
191 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
192 copy
[p
- symdef
->name
] = '\0';
194 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
195 false, false, false);
197 bfd_release (abfd
, copy
);
203 if (h
->root
.type
!= bfd_link_hash_undefined
)
205 if (h
->root
.type
!= bfd_link_hash_undefweak
)
210 /* We need to include this archive member. */
212 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
213 if (element
== (bfd
*) NULL
)
216 if (! bfd_check_format (element
, bfd_object
))
219 /* Doublecheck that we have not included this object
220 already--it should be impossible, but there may be
221 something wrong with the archive. */
222 if (element
->archive_pass
!= 0)
224 bfd_set_error (bfd_error_bad_value
);
227 element
->archive_pass
= 1;
229 undefs_tail
= info
->hash
->undefs_tail
;
231 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
234 if (! elf_link_add_object_symbols (element
, info
))
237 /* If there are any new undefined symbols, we need to make
238 another pass through the archive in order to see whether
239 they can be defined. FIXME: This isn't perfect, because
240 common symbols wind up on undefs_tail and because an
241 undefined symbol which is defined later on in this pass
242 does not require another pass. This isn't a bug, but it
243 does make the code less efficient than it could be. */
244 if (undefs_tail
!= info
->hash
->undefs_tail
)
247 /* Look backward to mark all symbols from this object file
248 which we have already seen in this pass. */
252 included
[mark
] = true;
257 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
259 /* We mark subsequent symbols from this object file as we go
260 on through the loop. */
261 last
= symdef
->file_offset
;
272 if (defined
!= (boolean
*) NULL
)
274 if (included
!= (boolean
*) NULL
)
279 /* This function is called when we want to define a new symbol. It
280 handles the various cases which arise when we find a definition in
281 a dynamic object, or when there is already a definition in a
282 dynamic object. The new symbol is described by NAME, SYM, PSEC,
283 and PVALUE. We set SYM_HASH to the hash table entry. We set
284 OVERRIDE if the old symbol is overriding a new definition. We set
285 TYPE_CHANGE_OK if it is OK for the type to change. We set
286 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
287 change, we mean that we shouldn't warn if the type or size does
291 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
292 override
, type_change_ok
, size_change_ok
)
294 struct bfd_link_info
*info
;
296 Elf_Internal_Sym
*sym
;
299 struct elf_link_hash_entry
**sym_hash
;
301 boolean
*type_change_ok
;
302 boolean
*size_change_ok
;
305 struct elf_link_hash_entry
*h
;
308 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
313 bind
= ELF_ST_BIND (sym
->st_info
);
315 if (! bfd_is_und_section (sec
))
316 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
318 h
= ((struct elf_link_hash_entry
*)
319 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
324 /* This code is for coping with dynamic objects, and is only useful
325 if we are doing an ELF link. */
326 if (info
->hash
->creator
!= abfd
->xvec
)
329 /* For merging, we only care about real symbols. */
331 while (h
->root
.type
== bfd_link_hash_indirect
332 || h
->root
.type
== bfd_link_hash_warning
)
333 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
335 /* If we just created the symbol, mark it as being an ELF symbol.
336 Other than that, there is nothing to do--there is no merge issue
337 with a newly defined symbol--so we just return. */
339 if (h
->root
.type
== bfd_link_hash_new
)
341 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
345 /* OLDBFD is a BFD associated with the existing symbol. */
347 switch (h
->root
.type
)
353 case bfd_link_hash_undefined
:
354 case bfd_link_hash_undefweak
:
355 oldbfd
= h
->root
.u
.undef
.abfd
;
358 case bfd_link_hash_defined
:
359 case bfd_link_hash_defweak
:
360 oldbfd
= h
->root
.u
.def
.section
->owner
;
363 case bfd_link_hash_common
:
364 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
368 /* In cases involving weak versioned symbols, we may wind up trying
369 to merge a symbol with itself. Catch that here, to avoid the
370 confusion that results if we try to override a symbol with
371 itself. The additional tests catch cases like
372 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
373 dynamic object, which we do want to handle here. */
375 && ((abfd
->flags
& DYNAMIC
) == 0
376 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
379 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
380 respectively, is from a dynamic object. */
382 if ((abfd
->flags
& DYNAMIC
) != 0)
387 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
392 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
393 respectively, appear to be a definition rather than reference. */
395 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
400 if (h
->root
.type
== bfd_link_hash_undefined
401 || h
->root
.type
== bfd_link_hash_undefweak
402 || h
->root
.type
== bfd_link_hash_common
)
407 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
408 symbol, respectively, appears to be a common symbol in a dynamic
409 object. If a symbol appears in an uninitialized section, and is
410 not weak, and is not a function, then it may be a common symbol
411 which was resolved when the dynamic object was created. We want
412 to treat such symbols specially, because they raise special
413 considerations when setting the symbol size: if the symbol
414 appears as a common symbol in a regular object, and the size in
415 the regular object is larger, we must make sure that we use the
416 larger size. This problematic case can always be avoided in C,
417 but it must be handled correctly when using Fortran shared
420 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
421 likewise for OLDDYNCOMMON and OLDDEF.
423 Note that this test is just a heuristic, and that it is quite
424 possible to have an uninitialized symbol in a shared object which
425 is really a definition, rather than a common symbol. This could
426 lead to some minor confusion when the symbol really is a common
427 symbol in some regular object. However, I think it will be
432 && (sec
->flags
& SEC_ALLOC
) != 0
433 && (sec
->flags
& SEC_LOAD
) == 0
436 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
439 newdyncommon
= false;
443 && h
->root
.type
== bfd_link_hash_defined
444 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
445 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
446 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
448 && h
->type
!= STT_FUNC
)
451 olddyncommon
= false;
453 /* It's OK to change the type if either the existing symbol or the
454 new symbol is weak. */
456 if (h
->root
.type
== bfd_link_hash_defweak
457 || h
->root
.type
== bfd_link_hash_undefweak
459 *type_change_ok
= true;
461 /* It's OK to change the size if either the existing symbol or the
462 new symbol is weak, or if the old symbol is undefined. */
465 || h
->root
.type
== bfd_link_hash_undefined
)
466 *size_change_ok
= true;
468 /* If both the old and the new symbols look like common symbols in a
469 dynamic object, set the size of the symbol to the larger of the
474 && sym
->st_size
!= h
->size
)
476 /* Since we think we have two common symbols, issue a multiple
477 common warning if desired. Note that we only warn if the
478 size is different. If the size is the same, we simply let
479 the old symbol override the new one as normally happens with
480 symbols defined in dynamic objects. */
482 if (! ((*info
->callbacks
->multiple_common
)
483 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
484 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
487 if (sym
->st_size
> h
->size
)
488 h
->size
= sym
->st_size
;
490 *size_change_ok
= true;
493 /* If we are looking at a dynamic object, and we have found a
494 definition, we need to see if the symbol was already defined by
495 some other object. If so, we want to use the existing
496 definition, and we do not want to report a multiple symbol
497 definition error; we do this by clobbering *PSEC to be
500 We treat a common symbol as a definition if the symbol in the
501 shared library is a function, since common symbols always
502 represent variables; this can cause confusion in principle, but
503 any such confusion would seem to indicate an erroneous program or
504 shared library. We also permit a common symbol in a regular
505 object to override a weak symbol in a shared object.
507 We prefer a non-weak definition in a shared library to a weak
508 definition in the executable. */
513 || (h
->root
.type
== bfd_link_hash_common
515 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
516 && (h
->root
.type
!= bfd_link_hash_defweak
517 || bind
== STB_WEAK
))
521 newdyncommon
= false;
523 *psec
= sec
= bfd_und_section_ptr
;
524 *size_change_ok
= true;
526 /* If we get here when the old symbol is a common symbol, then
527 we are explicitly letting it override a weak symbol or
528 function in a dynamic object, and we don't want to warn about
529 a type change. If the old symbol is a defined symbol, a type
530 change warning may still be appropriate. */
532 if (h
->root
.type
== bfd_link_hash_common
)
533 *type_change_ok
= true;
536 /* Handle the special case of an old common symbol merging with a
537 new symbol which looks like a common symbol in a shared object.
538 We change *PSEC and *PVALUE to make the new symbol look like a
539 common symbol, and let _bfd_generic_link_add_one_symbol will do
543 && h
->root
.type
== bfd_link_hash_common
)
547 newdyncommon
= false;
548 *pvalue
= sym
->st_size
;
549 *psec
= sec
= bfd_com_section_ptr
;
550 *size_change_ok
= true;
553 /* If the old symbol is from a dynamic object, and the new symbol is
554 a definition which is not from a dynamic object, then the new
555 symbol overrides the old symbol. Symbols from regular files
556 always take precedence over symbols from dynamic objects, even if
557 they are defined after the dynamic object in the link.
559 As above, we again permit a common symbol in a regular object to
560 override a definition in a shared object if the shared object
561 symbol is a function or is weak.
563 As above, we permit a non-weak definition in a shared object to
564 override a weak definition in a regular object. */
568 || (bfd_is_com_section (sec
)
569 && (h
->root
.type
== bfd_link_hash_defweak
570 || h
->type
== STT_FUNC
)))
573 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
575 || h
->root
.type
== bfd_link_hash_defweak
))
577 /* Change the hash table entry to undefined, and let
578 _bfd_generic_link_add_one_symbol do the right thing with the
581 h
->root
.type
= bfd_link_hash_undefined
;
582 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
583 *size_change_ok
= true;
586 olddyncommon
= false;
588 /* We again permit a type change when a common symbol may be
589 overriding a function. */
591 if (bfd_is_com_section (sec
))
592 *type_change_ok
= true;
594 /* This union may have been set to be non-NULL when this symbol
595 was seen in a dynamic object. We must force the union to be
596 NULL, so that it is correct for a regular symbol. */
598 h
->verinfo
.vertree
= NULL
;
600 /* In this special case, if H is the target of an indirection,
601 we want the caller to frob with H rather than with the
602 indirect symbol. That will permit the caller to redefine the
603 target of the indirection, rather than the indirect symbol
604 itself. FIXME: This will break the -y option if we store a
605 symbol with a different name. */
609 /* Handle the special case of a new common symbol merging with an
610 old symbol that looks like it might be a common symbol defined in
611 a shared object. Note that we have already handled the case in
612 which a new common symbol should simply override the definition
613 in the shared library. */
616 && bfd_is_com_section (sec
)
619 /* It would be best if we could set the hash table entry to a
620 common symbol, but we don't know what to use for the section
622 if (! ((*info
->callbacks
->multiple_common
)
623 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
624 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
627 /* If the predumed common symbol in the dynamic object is
628 larger, pretend that the new symbol has its size. */
630 if (h
->size
> *pvalue
)
633 /* FIXME: We no longer know the alignment required by the symbol
634 in the dynamic object, so we just wind up using the one from
635 the regular object. */
638 olddyncommon
= false;
640 h
->root
.type
= bfd_link_hash_undefined
;
641 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
643 *size_change_ok
= true;
644 *type_change_ok
= true;
646 h
->verinfo
.vertree
= NULL
;
649 /* Handle the special case of a weak definition in a regular object
650 followed by a non-weak definition in a shared object. In this
651 case, we prefer the definition in the shared object. */
653 && h
->root
.type
== bfd_link_hash_defweak
658 /* To make this work we have to frob the flags so that the rest
659 of the code does not think we are using the regular
661 h
->elf_link_hash_flags
&= ~ ELF_LINK_HASH_DEF_REGULAR
;
662 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
664 /* If H is the target of an indirection, we want the caller to
665 use H rather than the indirect symbol. Otherwise if we are
666 defining a new indirect symbol we will wind up attaching it
667 to the entry we are overriding. */
671 /* Handle the special case of a non-weak definition in a shared
672 object followed by a weak definition in a regular object. In
673 this case we prefer to definition in the shared object. To make
674 this work we have to tell the caller to not treat the new symbol
678 && h
->root
.type
!= bfd_link_hash_defweak
687 /* Add symbols from an ELF object file to the linker hash table. */
690 elf_link_add_object_symbols (abfd
, info
)
692 struct bfd_link_info
*info
;
694 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
695 const Elf_Internal_Sym
*,
696 const char **, flagword
*,
697 asection
**, bfd_vma
*));
698 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
699 asection
*, const Elf_Internal_Rela
*));
701 Elf_Internal_Shdr
*hdr
;
705 Elf_External_Sym
*buf
= NULL
;
706 struct elf_link_hash_entry
**sym_hash
;
708 bfd_byte
*dynver
= NULL
;
709 Elf_External_Versym
*extversym
= NULL
;
710 Elf_External_Versym
*ever
;
711 Elf_External_Dyn
*dynbuf
= NULL
;
712 struct elf_link_hash_entry
*weaks
;
713 Elf_External_Sym
*esym
;
714 Elf_External_Sym
*esymend
;
716 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
717 collect
= get_elf_backend_data (abfd
)->collect
;
719 if ((abfd
->flags
& DYNAMIC
) == 0)
725 /* You can't use -r against a dynamic object. Also, there's no
726 hope of using a dynamic object which does not exactly match
727 the format of the output file. */
728 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
730 bfd_set_error (bfd_error_invalid_operation
);
735 /* As a GNU extension, any input sections which are named
736 .gnu.warning.SYMBOL are treated as warning symbols for the given
737 symbol. This differs from .gnu.warning sections, which generate
738 warnings when they are included in an output file. */
743 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
747 name
= bfd_get_section_name (abfd
, s
);
748 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
753 name
+= sizeof ".gnu.warning." - 1;
755 /* If this is a shared object, then look up the symbol
756 in the hash table. If it is there, and it is already
757 been defined, then we will not be using the entry
758 from this shared object, so we don't need to warn.
759 FIXME: If we see the definition in a regular object
760 later on, we will warn, but we shouldn't. The only
761 fix is to keep track of what warnings we are supposed
762 to emit, and then handle them all at the end of the
764 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
766 struct elf_link_hash_entry
*h
;
768 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
771 /* FIXME: What about bfd_link_hash_common? */
773 && (h
->root
.type
== bfd_link_hash_defined
774 || h
->root
.type
== bfd_link_hash_defweak
))
776 /* We don't want to issue this warning. Clobber
777 the section size so that the warning does not
778 get copied into the output file. */
784 sz
= bfd_section_size (abfd
, s
);
785 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
789 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
794 if (! (_bfd_generic_link_add_one_symbol
795 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
796 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
799 if (! info
->relocateable
)
801 /* Clobber the section size so that the warning does
802 not get copied into the output file. */
809 /* If this is a dynamic object, we always link against the .dynsym
810 symbol table, not the .symtab symbol table. The dynamic linker
811 will only see the .dynsym symbol table, so there is no reason to
812 look at .symtab for a dynamic object. */
814 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
815 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
817 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
821 /* Read in any version definitions. */
823 if (! _bfd_elf_slurp_version_tables (abfd
))
826 /* Read in the symbol versions, but don't bother to convert them
827 to internal format. */
828 if (elf_dynversym (abfd
) != 0)
830 Elf_Internal_Shdr
*versymhdr
;
832 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
833 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
834 if (extversym
== NULL
)
836 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
837 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
838 != versymhdr
->sh_size
))
843 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
845 /* The sh_info field of the symtab header tells us where the
846 external symbols start. We don't care about the local symbols at
848 if (elf_bad_symtab (abfd
))
850 extsymcount
= symcount
;
855 extsymcount
= symcount
- hdr
->sh_info
;
856 extsymoff
= hdr
->sh_info
;
859 buf
= ((Elf_External_Sym
*)
860 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
861 if (buf
== NULL
&& extsymcount
!= 0)
864 /* We store a pointer to the hash table entry for each external
866 sym_hash
= ((struct elf_link_hash_entry
**)
868 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
869 if (sym_hash
== NULL
)
871 elf_sym_hashes (abfd
) = sym_hash
;
875 /* If we are creating a shared library, create all the dynamic
876 sections immediately. We need to attach them to something,
877 so we attach them to this BFD, provided it is the right
878 format. FIXME: If there are no input BFD's of the same
879 format as the output, we can't make a shared library. */
881 && ! elf_hash_table (info
)->dynamic_sections_created
882 && abfd
->xvec
== info
->hash
->creator
)
884 if (! elf_link_create_dynamic_sections (abfd
, info
))
893 bfd_size_type oldsize
;
894 bfd_size_type strindex
;
896 /* Find the name to use in a DT_NEEDED entry that refers to this
897 object. If the object has a DT_SONAME entry, we use it.
898 Otherwise, if the generic linker stuck something in
899 elf_dt_name, we use that. Otherwise, we just use the file
900 name. If the generic linker put a null string into
901 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
902 there is a DT_SONAME entry. */
904 name
= bfd_get_filename (abfd
);
905 if (elf_dt_name (abfd
) != NULL
)
907 name
= elf_dt_name (abfd
);
911 s
= bfd_get_section_by_name (abfd
, ".dynamic");
914 Elf_External_Dyn
*extdyn
;
915 Elf_External_Dyn
*extdynend
;
919 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
923 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
924 (file_ptr
) 0, s
->_raw_size
))
927 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
930 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
933 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
934 for (; extdyn
< extdynend
; extdyn
++)
936 Elf_Internal_Dyn dyn
;
938 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
939 if (dyn
.d_tag
== DT_SONAME
)
941 name
= bfd_elf_string_from_elf_section (abfd
, link
,
946 if (dyn
.d_tag
== DT_NEEDED
)
948 struct bfd_link_needed_list
*n
, **pn
;
951 n
= ((struct bfd_link_needed_list
*)
952 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
953 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
955 if (n
== NULL
|| fnm
== NULL
)
957 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
964 for (pn
= &elf_hash_table (info
)->needed
;
976 /* We do not want to include any of the sections in a dynamic
977 object in the output file. We hack by simply clobbering the
978 list of sections in the BFD. This could be handled more
979 cleanly by, say, a new section flag; the existing
980 SEC_NEVER_LOAD flag is not the one we want, because that one
981 still implies that the section takes up space in the output
983 abfd
->sections
= NULL
;
984 abfd
->section_count
= 0;
986 /* If this is the first dynamic object found in the link, create
987 the special sections required for dynamic linking. */
988 if (! elf_hash_table (info
)->dynamic_sections_created
)
990 if (! elf_link_create_dynamic_sections (abfd
, info
))
996 /* Add a DT_NEEDED entry for this dynamic object. */
997 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
998 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1000 if (strindex
== (bfd_size_type
) -1)
1003 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1006 Elf_External_Dyn
*dyncon
, *dynconend
;
1008 /* The hash table size did not change, which means that
1009 the dynamic object name was already entered. If we
1010 have already included this dynamic object in the
1011 link, just ignore it. There is no reason to include
1012 a particular dynamic object more than once. */
1013 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1015 BFD_ASSERT (sdyn
!= NULL
);
1017 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1018 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1020 for (; dyncon
< dynconend
; dyncon
++)
1022 Elf_Internal_Dyn dyn
;
1024 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1026 if (dyn
.d_tag
== DT_NEEDED
1027 && dyn
.d_un
.d_val
== strindex
)
1031 if (extversym
!= NULL
)
1038 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1042 /* Save the SONAME, if there is one, because sometimes the
1043 linker emulation code will need to know it. */
1045 name
= bfd_get_filename (abfd
);
1046 elf_dt_name (abfd
) = name
;
1050 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1052 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1053 != extsymcount
* sizeof (Elf_External_Sym
)))
1058 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1059 esymend
= buf
+ extsymcount
;
1062 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1064 Elf_Internal_Sym sym
;
1070 struct elf_link_hash_entry
*h
;
1072 boolean size_change_ok
, type_change_ok
;
1073 boolean new_weakdef
;
1074 unsigned int old_alignment
;
1076 elf_swap_symbol_in (abfd
, esym
, &sym
);
1078 flags
= BSF_NO_FLAGS
;
1080 value
= sym
.st_value
;
1083 bind
= ELF_ST_BIND (sym
.st_info
);
1084 if (bind
== STB_LOCAL
)
1086 /* This should be impossible, since ELF requires that all
1087 global symbols follow all local symbols, and that sh_info
1088 point to the first global symbol. Unfortunatealy, Irix 5
1092 else if (bind
== STB_GLOBAL
)
1094 if (sym
.st_shndx
!= SHN_UNDEF
1095 && sym
.st_shndx
!= SHN_COMMON
)
1100 else if (bind
== STB_WEAK
)
1104 /* Leave it up to the processor backend. */
1107 if (sym
.st_shndx
== SHN_UNDEF
)
1108 sec
= bfd_und_section_ptr
;
1109 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1111 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1113 sec
= bfd_abs_section_ptr
;
1114 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1117 else if (sym
.st_shndx
== SHN_ABS
)
1118 sec
= bfd_abs_section_ptr
;
1119 else if (sym
.st_shndx
== SHN_COMMON
)
1121 sec
= bfd_com_section_ptr
;
1122 /* What ELF calls the size we call the value. What ELF
1123 calls the value we call the alignment. */
1124 value
= sym
.st_size
;
1128 /* Leave it up to the processor backend. */
1131 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1132 if (name
== (const char *) NULL
)
1135 if (add_symbol_hook
)
1137 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1141 /* The hook function sets the name to NULL if this symbol
1142 should be skipped for some reason. */
1143 if (name
== (const char *) NULL
)
1147 /* Sanity check that all possibilities were handled. */
1148 if (sec
== (asection
*) NULL
)
1150 bfd_set_error (bfd_error_bad_value
);
1154 if (bfd_is_und_section (sec
)
1155 || bfd_is_com_section (sec
))
1160 size_change_ok
= false;
1161 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1163 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1165 Elf_Internal_Versym iver
;
1166 unsigned int vernum
= 0;
1171 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1172 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1174 /* If this is a hidden symbol, or if it is not version
1175 1, we append the version name to the symbol name.
1176 However, we do not modify a non-hidden absolute
1177 symbol, because it might be the version symbol
1178 itself. FIXME: What if it isn't? */
1179 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1180 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1183 int namelen
, newlen
;
1186 if (sym
.st_shndx
!= SHN_UNDEF
)
1188 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1190 (*_bfd_error_handler
)
1191 (_("%s: %s: invalid version %u (max %d)"),
1192 bfd_get_filename (abfd
), name
, vernum
,
1193 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1194 bfd_set_error (bfd_error_bad_value
);
1197 else if (vernum
> 1)
1199 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1205 /* We cannot simply test for the number of
1206 entries in the VERNEED section since the
1207 numbers for the needed versions do not start
1209 Elf_Internal_Verneed
*t
;
1212 for (t
= elf_tdata (abfd
)->verref
;
1216 Elf_Internal_Vernaux
*a
;
1218 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1220 if (a
->vna_other
== vernum
)
1222 verstr
= a
->vna_nodename
;
1231 (*_bfd_error_handler
)
1232 (_("%s: %s: invalid needed version %d"),
1233 bfd_get_filename (abfd
), name
, vernum
);
1234 bfd_set_error (bfd_error_bad_value
);
1239 namelen
= strlen (name
);
1240 newlen
= namelen
+ strlen (verstr
) + 2;
1241 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1244 newname
= (char *) bfd_alloc (abfd
, newlen
);
1245 if (newname
== NULL
)
1247 strcpy (newname
, name
);
1248 p
= newname
+ namelen
;
1250 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1258 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1259 sym_hash
, &override
, &type_change_ok
,
1267 while (h
->root
.type
== bfd_link_hash_indirect
1268 || h
->root
.type
== bfd_link_hash_warning
)
1269 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1271 /* Remember the old alignment if this is a common symbol, so
1272 that we don't reduce the alignment later on. We can't
1273 check later, because _bfd_generic_link_add_one_symbol
1274 will set a default for the alignment which we want to
1276 if (h
->root
.type
== bfd_link_hash_common
)
1277 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1279 if (elf_tdata (abfd
)->verdef
!= NULL
1283 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1286 if (! (_bfd_generic_link_add_one_symbol
1287 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1288 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1292 while (h
->root
.type
== bfd_link_hash_indirect
1293 || h
->root
.type
== bfd_link_hash_warning
)
1294 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1297 new_weakdef
= false;
1300 && (flags
& BSF_WEAK
) != 0
1301 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1302 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1303 && h
->weakdef
== NULL
)
1305 /* Keep a list of all weak defined non function symbols from
1306 a dynamic object, using the weakdef field. Later in this
1307 function we will set the weakdef field to the correct
1308 value. We only put non-function symbols from dynamic
1309 objects on this list, because that happens to be the only
1310 time we need to know the normal symbol corresponding to a
1311 weak symbol, and the information is time consuming to
1312 figure out. If the weakdef field is not already NULL,
1313 then this symbol was already defined by some previous
1314 dynamic object, and we will be using that previous
1315 definition anyhow. */
1322 /* Set the alignment of a common symbol. */
1323 if (sym
.st_shndx
== SHN_COMMON
1324 && h
->root
.type
== bfd_link_hash_common
)
1328 align
= bfd_log2 (sym
.st_value
);
1329 if (align
> old_alignment
)
1330 h
->root
.u
.c
.p
->alignment_power
= align
;
1333 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1339 /* Remember the symbol size and type. */
1340 if (sym
.st_size
!= 0
1341 && (definition
|| h
->size
== 0))
1343 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1344 (*_bfd_error_handler
)
1345 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1346 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1347 bfd_get_filename (abfd
));
1349 h
->size
= sym
.st_size
;
1352 /* If this is a common symbol, then we always want H->SIZE
1353 to be the size of the common symbol. The code just above
1354 won't fix the size if a common symbol becomes larger. We
1355 don't warn about a size change here, because that is
1356 covered by --warn-common. */
1357 if (h
->root
.type
== bfd_link_hash_common
)
1358 h
->size
= h
->root
.u
.c
.size
;
1360 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1361 && (definition
|| h
->type
== STT_NOTYPE
))
1363 if (h
->type
!= STT_NOTYPE
1364 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1365 && ! type_change_ok
)
1366 (*_bfd_error_handler
)
1367 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1368 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1369 bfd_get_filename (abfd
));
1371 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1374 if (sym
.st_other
!= 0
1375 && (definition
|| h
->other
== 0))
1376 h
->other
= sym
.st_other
;
1378 /* Set a flag in the hash table entry indicating the type of
1379 reference or definition we just found. Keep a count of
1380 the number of dynamic symbols we find. A dynamic symbol
1381 is one which is referenced or defined by both a regular
1382 object and a shared object. */
1383 old_flags
= h
->elf_link_hash_flags
;
1389 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1390 if (bind
!= STB_WEAK
)
1391 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1394 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1396 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1397 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1403 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1405 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1406 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1407 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1408 || (h
->weakdef
!= NULL
1410 && h
->weakdef
->dynindx
!= -1))
1414 h
->elf_link_hash_flags
|= new_flag
;
1416 /* If this symbol has a version, and it is the default
1417 version, we create an indirect symbol from the default
1418 name to the fully decorated name. This will cause
1419 external references which do not specify a version to be
1420 bound to this version of the symbol. */
1425 p
= strchr (name
, ELF_VER_CHR
);
1426 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1429 struct elf_link_hash_entry
*hi
;
1432 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1434 if (shortname
== NULL
)
1436 strncpy (shortname
, name
, p
- name
);
1437 shortname
[p
- name
] = '\0';
1439 /* We are going to create a new symbol. Merge it
1440 with any existing symbol with this name. For the
1441 purposes of the merge, act as though we were
1442 defining the symbol we just defined, although we
1443 actually going to define an indirect symbol. */
1444 type_change_ok
= false;
1445 size_change_ok
= false;
1446 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1447 &value
, &hi
, &override
,
1448 &type_change_ok
, &size_change_ok
))
1453 if (! (_bfd_generic_link_add_one_symbol
1454 (info
, abfd
, shortname
, BSF_INDIRECT
,
1455 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1456 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1461 /* In this case the symbol named SHORTNAME is
1462 overriding the indirect symbol we want to
1463 add. We were planning on making SHORTNAME an
1464 indirect symbol referring to NAME. SHORTNAME
1465 is the name without a version. NAME is the
1466 fully versioned name, and it is the default
1469 Overriding means that we already saw a
1470 definition for the symbol SHORTNAME in a
1471 regular object, and it is overriding the
1472 symbol defined in the dynamic object.
1474 When this happens, we actually want to change
1475 NAME, the symbol we just added, to refer to
1476 SHORTNAME. This will cause references to
1477 NAME in the shared object to become
1478 references to SHORTNAME in the regular
1479 object. This is what we expect when we
1480 override a function in a shared object: that
1481 the references in the shared object will be
1482 mapped to the definition in the regular
1485 while (hi
->root
.type
== bfd_link_hash_indirect
1486 || hi
->root
.type
== bfd_link_hash_warning
)
1487 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1489 h
->root
.type
= bfd_link_hash_indirect
;
1490 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1491 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1493 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1494 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1495 if (hi
->elf_link_hash_flags
1496 & (ELF_LINK_HASH_REF_REGULAR
1497 | ELF_LINK_HASH_DEF_REGULAR
))
1499 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1505 /* Now set HI to H, so that the following code
1506 will set the other fields correctly. */
1510 /* If there is a duplicate definition somewhere,
1511 then HI may not point to an indirect symbol. We
1512 will have reported an error to the user in that
1515 if (hi
->root
.type
== bfd_link_hash_indirect
)
1517 struct elf_link_hash_entry
*ht
;
1519 /* If the symbol became indirect, then we assume
1520 that we have not seen a definition before. */
1521 BFD_ASSERT ((hi
->elf_link_hash_flags
1522 & (ELF_LINK_HASH_DEF_DYNAMIC
1523 | ELF_LINK_HASH_DEF_REGULAR
))
1526 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1528 /* Copy down any references that we may have
1529 already seen to the symbol which just became
1531 ht
->elf_link_hash_flags
|=
1532 (hi
->elf_link_hash_flags
1533 & (ELF_LINK_HASH_REF_DYNAMIC
1534 | ELF_LINK_HASH_REF_REGULAR
1535 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1537 /* Copy over the global and procedure linkage table
1538 offset entries. These may have been already set
1539 up by a check_relocs routine. */
1540 if (ht
->got
.offset
== (bfd_vma
) -1)
1542 ht
->got
.offset
= hi
->got
.offset
;
1543 hi
->got
.offset
= (bfd_vma
) -1;
1545 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1547 if (ht
->plt
.offset
== (bfd_vma
) -1)
1549 ht
->plt
.offset
= hi
->plt
.offset
;
1550 hi
->plt
.offset
= (bfd_vma
) -1;
1552 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1554 if (ht
->dynindx
== -1)
1556 ht
->dynindx
= hi
->dynindx
;
1557 ht
->dynstr_index
= hi
->dynstr_index
;
1559 hi
->dynstr_index
= 0;
1561 BFD_ASSERT (hi
->dynindx
== -1);
1563 /* FIXME: There may be other information to copy
1564 over for particular targets. */
1566 /* See if the new flags lead us to realize that
1567 the symbol must be dynamic. */
1573 || ((hi
->elf_link_hash_flags
1574 & ELF_LINK_HASH_REF_DYNAMIC
)
1580 if ((hi
->elf_link_hash_flags
1581 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1587 /* We also need to define an indirection from the
1588 nondefault version of the symbol. */
1590 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1592 if (shortname
== NULL
)
1594 strncpy (shortname
, name
, p
- name
);
1595 strcpy (shortname
+ (p
- name
), p
+ 1);
1597 /* Once again, merge with any existing symbol. */
1598 type_change_ok
= false;
1599 size_change_ok
= false;
1600 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1601 &value
, &hi
, &override
,
1602 &type_change_ok
, &size_change_ok
))
1607 /* Here SHORTNAME is a versioned name, so we
1608 don't expect to see the type of override we
1609 do in the case above. */
1610 (*_bfd_error_handler
)
1611 (_("%s: warning: unexpected redefinition of `%s'"),
1612 bfd_get_filename (abfd
), shortname
);
1616 if (! (_bfd_generic_link_add_one_symbol
1617 (info
, abfd
, shortname
, BSF_INDIRECT
,
1618 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1619 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1622 /* If there is a duplicate definition somewhere,
1623 then HI may not point to an indirect symbol.
1624 We will have reported an error to the user in
1627 if (hi
->root
.type
== bfd_link_hash_indirect
)
1629 /* If the symbol became indirect, then we
1630 assume that we have not seen a definition
1632 BFD_ASSERT ((hi
->elf_link_hash_flags
1633 & (ELF_LINK_HASH_DEF_DYNAMIC
1634 | ELF_LINK_HASH_DEF_REGULAR
))
1637 /* Copy down any references that we may have
1638 already seen to the symbol which just
1640 h
->elf_link_hash_flags
|=
1641 (hi
->elf_link_hash_flags
1642 & (ELF_LINK_HASH_REF_DYNAMIC
1643 | ELF_LINK_HASH_REF_REGULAR
1644 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1646 /* Copy over the global and procedure linkage
1647 table offset entries. These may have been
1648 already set up by a check_relocs routine. */
1649 if (h
->got
.offset
== (bfd_vma
) -1)
1651 h
->got
.offset
= hi
->got
.offset
;
1652 hi
->got
.offset
= (bfd_vma
) -1;
1654 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1656 if (h
->plt
.offset
== (bfd_vma
) -1)
1658 h
->plt
.offset
= hi
->plt
.offset
;
1659 hi
->plt
.offset
= (bfd_vma
) -1;
1661 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1663 if (h
->dynindx
== -1)
1665 h
->dynindx
= hi
->dynindx
;
1666 h
->dynstr_index
= hi
->dynstr_index
;
1668 hi
->dynstr_index
= 0;
1670 BFD_ASSERT (hi
->dynindx
== -1);
1672 /* FIXME: There may be other information to
1673 copy over for particular targets. */
1675 /* See if the new flags lead us to realize
1676 that the symbol must be dynamic. */
1682 || ((hi
->elf_link_hash_flags
1683 & ELF_LINK_HASH_REF_DYNAMIC
)
1689 if ((hi
->elf_link_hash_flags
1690 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1699 if (dynsym
&& h
->dynindx
== -1)
1701 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1703 if (h
->weakdef
!= NULL
1705 && h
->weakdef
->dynindx
== -1)
1707 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1715 /* Now set the weakdefs field correctly for all the weak defined
1716 symbols we found. The only way to do this is to search all the
1717 symbols. Since we only need the information for non functions in
1718 dynamic objects, that's the only time we actually put anything on
1719 the list WEAKS. We need this information so that if a regular
1720 object refers to a symbol defined weakly in a dynamic object, the
1721 real symbol in the dynamic object is also put in the dynamic
1722 symbols; we also must arrange for both symbols to point to the
1723 same memory location. We could handle the general case of symbol
1724 aliasing, but a general symbol alias can only be generated in
1725 assembler code, handling it correctly would be very time
1726 consuming, and other ELF linkers don't handle general aliasing
1728 while (weaks
!= NULL
)
1730 struct elf_link_hash_entry
*hlook
;
1733 struct elf_link_hash_entry
**hpp
;
1734 struct elf_link_hash_entry
**hppend
;
1737 weaks
= hlook
->weakdef
;
1738 hlook
->weakdef
= NULL
;
1740 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1741 || hlook
->root
.type
== bfd_link_hash_defweak
1742 || hlook
->root
.type
== bfd_link_hash_common
1743 || hlook
->root
.type
== bfd_link_hash_indirect
);
1744 slook
= hlook
->root
.u
.def
.section
;
1745 vlook
= hlook
->root
.u
.def
.value
;
1747 hpp
= elf_sym_hashes (abfd
);
1748 hppend
= hpp
+ extsymcount
;
1749 for (; hpp
< hppend
; hpp
++)
1751 struct elf_link_hash_entry
*h
;
1754 if (h
!= NULL
&& h
!= hlook
1755 && h
->root
.type
== bfd_link_hash_defined
1756 && h
->root
.u
.def
.section
== slook
1757 && h
->root
.u
.def
.value
== vlook
)
1761 /* If the weak definition is in the list of dynamic
1762 symbols, make sure the real definition is put there
1764 if (hlook
->dynindx
!= -1
1765 && h
->dynindx
== -1)
1767 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1771 /* If the real definition is in the list of dynamic
1772 symbols, make sure the weak definition is put there
1773 as well. If we don't do this, then the dynamic
1774 loader might not merge the entries for the real
1775 definition and the weak definition. */
1776 if (h
->dynindx
!= -1
1777 && hlook
->dynindx
== -1)
1779 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1794 if (extversym
!= NULL
)
1800 /* If this object is the same format as the output object, and it is
1801 not a shared library, then let the backend look through the
1804 This is required to build global offset table entries and to
1805 arrange for dynamic relocs. It is not required for the
1806 particular common case of linking non PIC code, even when linking
1807 against shared libraries, but unfortunately there is no way of
1808 knowing whether an object file has been compiled PIC or not.
1809 Looking through the relocs is not particularly time consuming.
1810 The problem is that we must either (1) keep the relocs in memory,
1811 which causes the linker to require additional runtime memory or
1812 (2) read the relocs twice from the input file, which wastes time.
1813 This would be a good case for using mmap.
1815 I have no idea how to handle linking PIC code into a file of a
1816 different format. It probably can't be done. */
1817 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1819 && abfd
->xvec
== info
->hash
->creator
1820 && check_relocs
!= NULL
)
1824 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1826 Elf_Internal_Rela
*internal_relocs
;
1829 if ((o
->flags
& SEC_RELOC
) == 0
1830 || o
->reloc_count
== 0
1831 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1832 && (o
->flags
& SEC_DEBUGGING
) != 0)
1833 || bfd_is_abs_section (o
->output_section
))
1836 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1837 (abfd
, o
, (PTR
) NULL
,
1838 (Elf_Internal_Rela
*) NULL
,
1839 info
->keep_memory
));
1840 if (internal_relocs
== NULL
)
1843 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1845 if (! info
->keep_memory
)
1846 free (internal_relocs
);
1853 /* If this is a non-traditional, non-relocateable link, try to
1854 optimize the handling of the .stab/.stabstr sections. */
1856 && ! info
->relocateable
1857 && ! info
->traditional_format
1858 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1859 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1861 asection
*stab
, *stabstr
;
1863 stab
= bfd_get_section_by_name (abfd
, ".stab");
1866 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1868 if (stabstr
!= NULL
)
1870 struct bfd_elf_section_data
*secdata
;
1872 secdata
= elf_section_data (stab
);
1873 if (! _bfd_link_section_stabs (abfd
,
1874 &elf_hash_table (info
)->stab_info
,
1876 &secdata
->stab_info
))
1891 if (extversym
!= NULL
)
1896 /* Create some sections which will be filled in with dynamic linking
1897 information. ABFD is an input file which requires dynamic sections
1898 to be created. The dynamic sections take up virtual memory space
1899 when the final executable is run, so we need to create them before
1900 addresses are assigned to the output sections. We work out the
1901 actual contents and size of these sections later. */
1904 elf_link_create_dynamic_sections (abfd
, info
)
1906 struct bfd_link_info
*info
;
1909 register asection
*s
;
1910 struct elf_link_hash_entry
*h
;
1911 struct elf_backend_data
*bed
;
1913 if (elf_hash_table (info
)->dynamic_sections_created
)
1916 /* Make sure that all dynamic sections use the same input BFD. */
1917 if (elf_hash_table (info
)->dynobj
== NULL
)
1918 elf_hash_table (info
)->dynobj
= abfd
;
1920 abfd
= elf_hash_table (info
)->dynobj
;
1922 /* Note that we set the SEC_IN_MEMORY flag for all of these
1924 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1925 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1927 /* A dynamically linked executable has a .interp section, but a
1928 shared library does not. */
1931 s
= bfd_make_section (abfd
, ".interp");
1933 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1937 /* Create sections to hold version informations. These are removed
1938 if they are not needed. */
1939 s
= bfd_make_section (abfd
, ".gnu.version_d");
1941 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1942 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1945 s
= bfd_make_section (abfd
, ".gnu.version");
1947 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1948 || ! bfd_set_section_alignment (abfd
, s
, 1))
1951 s
= bfd_make_section (abfd
, ".gnu.version_r");
1953 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1954 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1957 s
= bfd_make_section (abfd
, ".dynsym");
1959 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1960 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1963 s
= bfd_make_section (abfd
, ".dynstr");
1965 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1968 /* Create a strtab to hold the dynamic symbol names. */
1969 if (elf_hash_table (info
)->dynstr
== NULL
)
1971 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1972 if (elf_hash_table (info
)->dynstr
== NULL
)
1976 s
= bfd_make_section (abfd
, ".dynamic");
1978 || ! bfd_set_section_flags (abfd
, s
, flags
)
1979 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1982 /* The special symbol _DYNAMIC is always set to the start of the
1983 .dynamic section. This call occurs before we have processed the
1984 symbols for any dynamic object, so we don't have to worry about
1985 overriding a dynamic definition. We could set _DYNAMIC in a
1986 linker script, but we only want to define it if we are, in fact,
1987 creating a .dynamic section. We don't want to define it if there
1988 is no .dynamic section, since on some ELF platforms the start up
1989 code examines it to decide how to initialize the process. */
1991 if (! (_bfd_generic_link_add_one_symbol
1992 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1993 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1994 (struct bfd_link_hash_entry
**) &h
)))
1996 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1997 h
->type
= STT_OBJECT
;
2000 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2003 bed
= get_elf_backend_data (abfd
);
2005 s
= bfd_make_section (abfd
, ".hash");
2007 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2008 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2010 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2012 /* Let the backend create the rest of the sections. This lets the
2013 backend set the right flags. The backend will normally create
2014 the .got and .plt sections. */
2015 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2018 elf_hash_table (info
)->dynamic_sections_created
= true;
2023 /* Add an entry to the .dynamic table. */
2026 elf_add_dynamic_entry (info
, tag
, val
)
2027 struct bfd_link_info
*info
;
2031 Elf_Internal_Dyn dyn
;
2035 bfd_byte
*newcontents
;
2037 dynobj
= elf_hash_table (info
)->dynobj
;
2039 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2040 BFD_ASSERT (s
!= NULL
);
2042 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2043 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2044 if (newcontents
== NULL
)
2048 dyn
.d_un
.d_val
= val
;
2049 elf_swap_dyn_out (dynobj
, &dyn
,
2050 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2052 s
->_raw_size
= newsize
;
2053 s
->contents
= newcontents
;
2058 /* Record a new local dynamic symbol. */
2061 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2062 struct bfd_link_info
*info
;
2066 struct elf_link_local_dynamic_entry
*entry
;
2067 struct elf_link_hash_table
*eht
;
2068 struct bfd_strtab_hash
*dynstr
;
2069 Elf_External_Sym esym
;
2070 unsigned long dynstr_index
;
2073 /* See if the entry exists already. */
2074 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2075 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2078 entry
= (struct elf_link_local_dynamic_entry
*)
2079 bfd_alloc (input_bfd
, sizeof (*entry
));
2083 /* Go find the symbol, so that we can find it's name. */
2084 if (bfd_seek (input_bfd
,
2085 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2086 + input_indx
* sizeof (Elf_External_Sym
)),
2088 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2089 != sizeof (Elf_External_Sym
)))
2091 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2093 name
= (bfd_elf_string_from_elf_section
2094 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2095 entry
->isym
.st_name
));
2097 dynstr
= elf_hash_table (info
)->dynstr
;
2100 /* Create a strtab to hold the dynamic symbol names. */
2101 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2106 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2107 if (dynstr_index
== (unsigned long) -1)
2109 entry
->isym
.st_name
= dynstr_index
;
2111 eht
= elf_hash_table (info
);
2113 entry
->next
= eht
->dynlocal
;
2114 eht
->dynlocal
= entry
;
2115 entry
->input_bfd
= input_bfd
;
2116 entry
->input_indx
= input_indx
;
2119 /* The dynindx will be set at the end of size_dynamic_sections. */
2125 /* Read and swap the relocs from the section indicated by SHDR. This
2126 may be either a REL or a RELA section. The relocations are
2127 translated into RELA relocations and stored in INTERNAL_RELOCS,
2128 which should have already been allocated to contain enough space.
2129 The EXTERNAL_RELOCS are a buffer where the external form of the
2130 relocations should be stored.
2132 Returns false if something goes wrong. */
2135 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2138 Elf_Internal_Shdr
*shdr
;
2139 PTR external_relocs
;
2140 Elf_Internal_Rela
*internal_relocs
;
2142 struct elf_backend_data
*bed
;
2144 /* If there aren't any relocations, that's OK. */
2148 /* Position ourselves at the start of the section. */
2149 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2152 /* Read the relocations. */
2153 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2157 bed
= get_elf_backend_data (abfd
);
2159 /* Convert the external relocations to the internal format. */
2160 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2162 Elf_External_Rel
*erel
;
2163 Elf_External_Rel
*erelend
;
2164 Elf_Internal_Rela
*irela
;
2165 Elf_Internal_Rel
*irel
;
2167 erel
= (Elf_External_Rel
*) external_relocs
;
2168 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2169 irela
= internal_relocs
;
2170 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2171 * sizeof (Elf_Internal_Rel
)));
2172 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2176 if (bed
->s
->swap_reloc_in
)
2177 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2179 elf_swap_reloc_in (abfd
, erel
, irel
);
2181 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2183 irela
[i
].r_offset
= irel
[i
].r_offset
;
2184 irela
[i
].r_info
= irel
[i
].r_info
;
2185 irela
[i
].r_addend
= 0;
2191 Elf_External_Rela
*erela
;
2192 Elf_External_Rela
*erelaend
;
2193 Elf_Internal_Rela
*irela
;
2195 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2197 erela
= (Elf_External_Rela
*) external_relocs
;
2198 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2199 irela
= internal_relocs
;
2200 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2202 if (bed
->s
->swap_reloca_in
)
2203 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2205 elf_swap_reloca_in (abfd
, erela
, irela
);
2212 /* Read and swap the relocs for a section O. They may have been
2213 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2214 not NULL, they are used as buffers to read into. They are known to
2215 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2216 the return value is allocated using either malloc or bfd_alloc,
2217 according to the KEEP_MEMORY argument. If O has two relocation
2218 sections (both REL and RELA relocations), then the REL_HDR
2219 relocations will appear first in INTERNAL_RELOCS, followed by the
2220 REL_HDR2 relocations. */
2223 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2227 PTR external_relocs
;
2228 Elf_Internal_Rela
*internal_relocs
;
2229 boolean keep_memory
;
2231 Elf_Internal_Shdr
*rel_hdr
;
2233 Elf_Internal_Rela
*alloc2
= NULL
;
2234 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2236 if (elf_section_data (o
)->relocs
!= NULL
)
2237 return elf_section_data (o
)->relocs
;
2239 if (o
->reloc_count
== 0)
2242 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2244 if (internal_relocs
== NULL
)
2248 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2249 * sizeof (Elf_Internal_Rela
));
2251 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2253 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2254 if (internal_relocs
== NULL
)
2258 if (external_relocs
== NULL
)
2260 size_t size
= (size_t) rel_hdr
->sh_size
;
2262 if (elf_section_data (o
)->rel_hdr2
)
2263 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2264 alloc1
= (PTR
) bfd_malloc (size
);
2267 external_relocs
= alloc1
;
2270 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2274 if (!elf_link_read_relocs_from_section
2276 elf_section_data (o
)->rel_hdr2
,
2277 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2278 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2279 * bed
->s
->int_rels_per_ext_rel
)))
2282 /* Cache the results for next time, if we can. */
2284 elf_section_data (o
)->relocs
= internal_relocs
;
2289 /* Don't free alloc2, since if it was allocated we are passing it
2290 back (under the name of internal_relocs). */
2292 return internal_relocs
;
2303 /* Record an assignment to a symbol made by a linker script. We need
2304 this in case some dynamic object refers to this symbol. */
2308 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2309 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2310 struct bfd_link_info
*info
;
2314 struct elf_link_hash_entry
*h
;
2316 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2319 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2323 if (h
->root
.type
== bfd_link_hash_new
)
2324 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2326 /* If this symbol is being provided by the linker script, and it is
2327 currently defined by a dynamic object, but not by a regular
2328 object, then mark it as undefined so that the generic linker will
2329 force the correct value. */
2331 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2332 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2333 h
->root
.type
= bfd_link_hash_undefined
;
2335 /* If this symbol is not being provided by the linker script, and it is
2336 currently defined by a dynamic object, but not by a regular object,
2337 then clear out any version information because the symbol will not be
2338 associated with the dynamic object any more. */
2340 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2341 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2342 h
->verinfo
.verdef
= NULL
;
2344 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2345 h
->type
= STT_OBJECT
;
2347 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2348 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2350 && h
->dynindx
== -1)
2352 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2355 /* If this is a weak defined symbol, and we know a corresponding
2356 real symbol from the same dynamic object, make sure the real
2357 symbol is also made into a dynamic symbol. */
2358 if (h
->weakdef
!= NULL
2359 && h
->weakdef
->dynindx
== -1)
2361 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2369 /* This structure is used to pass information to
2370 elf_link_assign_sym_version. */
2372 struct elf_assign_sym_version_info
2376 /* General link information. */
2377 struct bfd_link_info
*info
;
2379 struct bfd_elf_version_tree
*verdefs
;
2380 /* Whether we are exporting all dynamic symbols. */
2381 boolean export_dynamic
;
2382 /* Whether we had a failure. */
2386 /* This structure is used to pass information to
2387 elf_link_find_version_dependencies. */
2389 struct elf_find_verdep_info
2393 /* General link information. */
2394 struct bfd_link_info
*info
;
2395 /* The number of dependencies. */
2397 /* Whether we had a failure. */
2401 /* Array used to determine the number of hash table buckets to use
2402 based on the number of symbols there are. If there are fewer than
2403 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2404 fewer than 37 we use 17 buckets, and so forth. We never use more
2405 than 32771 buckets. */
2407 static const size_t elf_buckets
[] =
2409 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2413 /* Compute bucket count for hashing table. We do not use a static set
2414 of possible tables sizes anymore. Instead we determine for all
2415 possible reasonable sizes of the table the outcome (i.e., the
2416 number of collisions etc) and choose the best solution. The
2417 weighting functions are not too simple to allow the table to grow
2418 without bounds. Instead one of the weighting factors is the size.
2419 Therefore the result is always a good payoff between few collisions
2420 (= short chain lengths) and table size. */
2422 compute_bucket_count (info
)
2423 struct bfd_link_info
*info
;
2425 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2426 size_t best_size
= 0;
2427 unsigned long int *hashcodes
;
2428 unsigned long int *hashcodesp
;
2429 unsigned long int i
;
2431 /* Compute the hash values for all exported symbols. At the same
2432 time store the values in an array so that we could use them for
2434 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2435 * sizeof (unsigned long int));
2436 if (hashcodes
== NULL
)
2438 hashcodesp
= hashcodes
;
2440 /* Put all hash values in HASHCODES. */
2441 elf_link_hash_traverse (elf_hash_table (info
),
2442 elf_collect_hash_codes
, &hashcodesp
);
2444 /* We have a problem here. The following code to optimize the table
2445 size requires an integer type with more the 32 bits. If
2446 BFD_HOST_U_64_BIT is set we know about such a type. */
2447 #ifdef BFD_HOST_U_64_BIT
2448 if (info
->optimize
== true)
2450 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2453 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2454 unsigned long int *counts
;
2456 /* Possible optimization parameters: if we have NSYMS symbols we say
2457 that the hashing table must at least have NSYMS/4 and at most
2459 minsize
= nsyms
/ 4;
2462 best_size
= maxsize
= nsyms
* 2;
2464 /* Create array where we count the collisions in. We must use bfd_malloc
2465 since the size could be large. */
2466 counts
= (unsigned long int *) bfd_malloc (maxsize
2467 * sizeof (unsigned long int));
2474 /* Compute the "optimal" size for the hash table. The criteria is a
2475 minimal chain length. The minor criteria is (of course) the size
2477 for (i
= minsize
; i
< maxsize
; ++i
)
2479 /* Walk through the array of hashcodes and count the collisions. */
2480 BFD_HOST_U_64_BIT max
;
2481 unsigned long int j
;
2482 unsigned long int fact
;
2484 memset (counts
, '\0', i
* sizeof (unsigned long int));
2486 /* Determine how often each hash bucket is used. */
2487 for (j
= 0; j
< nsyms
; ++j
)
2488 ++counts
[hashcodes
[j
] % i
];
2490 /* For the weight function we need some information about the
2491 pagesize on the target. This is information need not be 100%
2492 accurate. Since this information is not available (so far) we
2493 define it here to a reasonable default value. If it is crucial
2494 to have a better value some day simply define this value. */
2495 # ifndef BFD_TARGET_PAGESIZE
2496 # define BFD_TARGET_PAGESIZE (4096)
2499 /* We in any case need 2 + NSYMS entries for the size values and
2501 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2504 /* Variant 1: optimize for short chains. We add the squares
2505 of all the chain lengths (which favous many small chain
2506 over a few long chains). */
2507 for (j
= 0; j
< i
; ++j
)
2508 max
+= counts
[j
] * counts
[j
];
2510 /* This adds penalties for the overall size of the table. */
2511 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2514 /* Variant 2: Optimize a lot more for small table. Here we
2515 also add squares of the size but we also add penalties for
2516 empty slots (the +1 term). */
2517 for (j
= 0; j
< i
; ++j
)
2518 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2520 /* The overall size of the table is considered, but not as
2521 strong as in variant 1, where it is squared. */
2522 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2526 /* Compare with current best results. */
2527 if (max
< best_chlen
)
2537 #endif /* defined (BFD_HOST_U_64_BIT) */
2539 /* This is the fallback solution if no 64bit type is available or if we
2540 are not supposed to spend much time on optimizations. We select the
2541 bucket count using a fixed set of numbers. */
2542 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2544 best_size
= elf_buckets
[i
];
2545 if (dynsymcount
< elf_buckets
[i
+ 1])
2550 /* Free the arrays we needed. */
2556 /* Set up the sizes and contents of the ELF dynamic sections. This is
2557 called by the ELF linker emulation before_allocation routine. We
2558 must set the sizes of the sections before the linker sets the
2559 addresses of the various sections. */
2562 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2563 export_dynamic
, filter_shlib
,
2564 auxiliary_filters
, info
, sinterpptr
,
2569 boolean export_dynamic
;
2570 const char *filter_shlib
;
2571 const char * const *auxiliary_filters
;
2572 struct bfd_link_info
*info
;
2573 asection
**sinterpptr
;
2574 struct bfd_elf_version_tree
*verdefs
;
2576 bfd_size_type soname_indx
;
2578 struct elf_backend_data
*bed
;
2579 struct elf_assign_sym_version_info asvinfo
;
2583 soname_indx
= (bfd_size_type
) -1;
2585 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2588 /* The backend may have to create some sections regardless of whether
2589 we're dynamic or not. */
2590 bed
= get_elf_backend_data (output_bfd
);
2591 if (bed
->elf_backend_always_size_sections
2592 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2595 dynobj
= elf_hash_table (info
)->dynobj
;
2597 /* If there were no dynamic objects in the link, there is nothing to
2602 /* If we are supposed to export all symbols into the dynamic symbol
2603 table (this is not the normal case), then do so. */
2606 struct elf_info_failed eif
;
2610 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2616 if (elf_hash_table (info
)->dynamic_sections_created
)
2618 struct elf_info_failed eif
;
2619 struct elf_link_hash_entry
*h
;
2620 bfd_size_type strsize
;
2622 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2623 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2627 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2628 soname
, true, true);
2629 if (soname_indx
== (bfd_size_type
) -1
2630 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2636 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2644 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2646 if (indx
== (bfd_size_type
) -1
2647 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2651 if (filter_shlib
!= NULL
)
2655 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2656 filter_shlib
, true, true);
2657 if (indx
== (bfd_size_type
) -1
2658 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2662 if (auxiliary_filters
!= NULL
)
2664 const char * const *p
;
2666 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2670 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2672 if (indx
== (bfd_size_type
) -1
2673 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2678 /* Attach all the symbols to their version information. */
2679 asvinfo
.output_bfd
= output_bfd
;
2680 asvinfo
.info
= info
;
2681 asvinfo
.verdefs
= verdefs
;
2682 asvinfo
.export_dynamic
= export_dynamic
;
2683 asvinfo
.failed
= false;
2685 elf_link_hash_traverse (elf_hash_table (info
),
2686 elf_link_assign_sym_version
,
2691 /* Find all symbols which were defined in a dynamic object and make
2692 the backend pick a reasonable value for them. */
2695 elf_link_hash_traverse (elf_hash_table (info
),
2696 elf_adjust_dynamic_symbol
,
2701 /* Add some entries to the .dynamic section. We fill in some of the
2702 values later, in elf_bfd_final_link, but we must add the entries
2703 now so that we know the final size of the .dynamic section. */
2705 /* If there are initialization and/or finalization functions to
2706 call then add the corresponding DT_INIT/DT_FINI entries. */
2707 h
= (info
->init_function
2708 ? elf_link_hash_lookup (elf_hash_table (info
),
2709 info
->init_function
, false,
2713 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2714 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2716 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2719 h
= (info
->fini_function
2720 ? elf_link_hash_lookup (elf_hash_table (info
),
2721 info
->fini_function
, false,
2725 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2726 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2728 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2732 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2733 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2734 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2735 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2736 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2737 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2738 sizeof (Elf_External_Sym
)))
2742 /* The backend must work out the sizes of all the other dynamic
2744 if (bed
->elf_backend_size_dynamic_sections
2745 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2748 if (elf_hash_table (info
)->dynamic_sections_created
)
2752 size_t bucketcount
= 0;
2753 Elf_Internal_Sym isym
;
2754 size_t hash_entry_size
;
2756 /* Set up the version definition section. */
2757 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2758 BFD_ASSERT (s
!= NULL
);
2760 /* We may have created additional version definitions if we are
2761 just linking a regular application. */
2762 verdefs
= asvinfo
.verdefs
;
2764 if (verdefs
== NULL
)
2765 _bfd_strip_section_from_output (s
);
2770 struct bfd_elf_version_tree
*t
;
2772 Elf_Internal_Verdef def
;
2773 Elf_Internal_Verdaux defaux
;
2778 /* Make space for the base version. */
2779 size
+= sizeof (Elf_External_Verdef
);
2780 size
+= sizeof (Elf_External_Verdaux
);
2783 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2785 struct bfd_elf_version_deps
*n
;
2787 size
+= sizeof (Elf_External_Verdef
);
2788 size
+= sizeof (Elf_External_Verdaux
);
2791 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2792 size
+= sizeof (Elf_External_Verdaux
);
2795 s
->_raw_size
= size
;
2796 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2797 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2800 /* Fill in the version definition section. */
2804 def
.vd_version
= VER_DEF_CURRENT
;
2805 def
.vd_flags
= VER_FLG_BASE
;
2808 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2809 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2810 + sizeof (Elf_External_Verdaux
));
2812 if (soname_indx
!= (bfd_size_type
) -1)
2814 def
.vd_hash
= bfd_elf_hash (soname
);
2815 defaux
.vda_name
= soname_indx
;
2822 name
= output_bfd
->filename
;
2823 def
.vd_hash
= bfd_elf_hash (name
);
2824 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2826 if (indx
== (bfd_size_type
) -1)
2828 defaux
.vda_name
= indx
;
2830 defaux
.vda_next
= 0;
2832 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2833 (Elf_External_Verdef
*)p
);
2834 p
+= sizeof (Elf_External_Verdef
);
2835 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2836 (Elf_External_Verdaux
*) p
);
2837 p
+= sizeof (Elf_External_Verdaux
);
2839 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2842 struct bfd_elf_version_deps
*n
;
2843 struct elf_link_hash_entry
*h
;
2846 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2849 /* Add a symbol representing this version. */
2851 if (! (_bfd_generic_link_add_one_symbol
2852 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2853 (bfd_vma
) 0, (const char *) NULL
, false,
2854 get_elf_backend_data (dynobj
)->collect
,
2855 (struct bfd_link_hash_entry
**) &h
)))
2857 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2858 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2859 h
->type
= STT_OBJECT
;
2860 h
->verinfo
.vertree
= t
;
2862 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2865 def
.vd_version
= VER_DEF_CURRENT
;
2867 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2868 def
.vd_flags
|= VER_FLG_WEAK
;
2869 def
.vd_ndx
= t
->vernum
+ 1;
2870 def
.vd_cnt
= cdeps
+ 1;
2871 def
.vd_hash
= bfd_elf_hash (t
->name
);
2872 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2873 if (t
->next
!= NULL
)
2874 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2875 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2879 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2880 (Elf_External_Verdef
*) p
);
2881 p
+= sizeof (Elf_External_Verdef
);
2883 defaux
.vda_name
= h
->dynstr_index
;
2884 if (t
->deps
== NULL
)
2885 defaux
.vda_next
= 0;
2887 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2888 t
->name_indx
= defaux
.vda_name
;
2890 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2891 (Elf_External_Verdaux
*) p
);
2892 p
+= sizeof (Elf_External_Verdaux
);
2894 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2896 if (n
->version_needed
== NULL
)
2898 /* This can happen if there was an error in the
2900 defaux
.vda_name
= 0;
2903 defaux
.vda_name
= n
->version_needed
->name_indx
;
2904 if (n
->next
== NULL
)
2905 defaux
.vda_next
= 0;
2907 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2909 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2910 (Elf_External_Verdaux
*) p
);
2911 p
+= sizeof (Elf_External_Verdaux
);
2915 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2916 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2919 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2922 /* Work out the size of the version reference section. */
2924 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2925 BFD_ASSERT (s
!= NULL
);
2927 struct elf_find_verdep_info sinfo
;
2929 sinfo
.output_bfd
= output_bfd
;
2931 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2932 if (sinfo
.vers
== 0)
2934 sinfo
.failed
= false;
2936 elf_link_hash_traverse (elf_hash_table (info
),
2937 elf_link_find_version_dependencies
,
2940 if (elf_tdata (output_bfd
)->verref
== NULL
)
2941 _bfd_strip_section_from_output (s
);
2944 Elf_Internal_Verneed
*t
;
2949 /* Build the version definition section. */
2952 for (t
= elf_tdata (output_bfd
)->verref
;
2956 Elf_Internal_Vernaux
*a
;
2958 size
+= sizeof (Elf_External_Verneed
);
2960 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2961 size
+= sizeof (Elf_External_Vernaux
);
2964 s
->_raw_size
= size
;
2965 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2966 if (s
->contents
== NULL
)
2970 for (t
= elf_tdata (output_bfd
)->verref
;
2975 Elf_Internal_Vernaux
*a
;
2979 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2982 t
->vn_version
= VER_NEED_CURRENT
;
2984 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2985 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2986 elf_dt_name (t
->vn_bfd
),
2989 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2990 t
->vn_bfd
->filename
, true, false);
2991 if (indx
== (bfd_size_type
) -1)
2994 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2995 if (t
->vn_nextref
== NULL
)
2998 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2999 + caux
* sizeof (Elf_External_Vernaux
));
3001 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3002 (Elf_External_Verneed
*) p
);
3003 p
+= sizeof (Elf_External_Verneed
);
3005 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3007 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3008 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3009 a
->vna_nodename
, true, false);
3010 if (indx
== (bfd_size_type
) -1)
3013 if (a
->vna_nextptr
== NULL
)
3016 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3018 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3019 (Elf_External_Vernaux
*) p
);
3020 p
+= sizeof (Elf_External_Vernaux
);
3024 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3025 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3028 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3032 /* Assign dynsym indicies. In a shared library we generate a
3033 section symbol for each output section, which come first.
3034 Next come all of the back-end allocated local dynamic syms,
3035 followed by the rest of the global symbols. */
3037 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3039 /* Work out the size of the symbol version section. */
3040 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3041 BFD_ASSERT (s
!= NULL
);
3042 if (dynsymcount
== 0
3043 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3045 _bfd_strip_section_from_output (s
);
3046 /* The DYNSYMCOUNT might have changed if we were going to
3047 output a dynamic symbol table entry for S. */
3048 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3052 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3053 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3054 if (s
->contents
== NULL
)
3057 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3061 /* Set the size of the .dynsym and .hash sections. We counted
3062 the number of dynamic symbols in elf_link_add_object_symbols.
3063 We will build the contents of .dynsym and .hash when we build
3064 the final symbol table, because until then we do not know the
3065 correct value to give the symbols. We built the .dynstr
3066 section as we went along in elf_link_add_object_symbols. */
3067 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3068 BFD_ASSERT (s
!= NULL
);
3069 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3070 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3071 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3074 /* The first entry in .dynsym is a dummy symbol. */
3081 elf_swap_symbol_out (output_bfd
, &isym
,
3082 (PTR
) (Elf_External_Sym
*) s
->contents
);
3084 /* Compute the size of the hashing table. As a side effect this
3085 computes the hash values for all the names we export. */
3086 bucketcount
= compute_bucket_count (info
);
3088 s
= bfd_get_section_by_name (dynobj
, ".hash");
3089 BFD_ASSERT (s
!= NULL
);
3090 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3091 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3092 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3093 if (s
->contents
== NULL
)
3095 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3097 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3098 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3099 s
->contents
+ hash_entry_size
);
3101 elf_hash_table (info
)->bucketcount
= bucketcount
;
3103 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3104 BFD_ASSERT (s
!= NULL
);
3105 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3107 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3114 /* Fix up the flags for a symbol. This handles various cases which
3115 can only be fixed after all the input files are seen. This is
3116 currently called by both adjust_dynamic_symbol and
3117 assign_sym_version, which is unnecessary but perhaps more robust in
3118 the face of future changes. */
3121 elf_fix_symbol_flags (h
, eif
)
3122 struct elf_link_hash_entry
*h
;
3123 struct elf_info_failed
*eif
;
3125 /* If this symbol was mentioned in a non-ELF file, try to set
3126 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3127 permit a non-ELF file to correctly refer to a symbol defined in
3128 an ELF dynamic object. */
3129 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3131 if (h
->root
.type
!= bfd_link_hash_defined
3132 && h
->root
.type
!= bfd_link_hash_defweak
)
3133 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3134 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3137 if (h
->root
.u
.def
.section
->owner
!= NULL
3138 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3139 == bfd_target_elf_flavour
))
3140 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3141 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3143 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3146 if (h
->dynindx
== -1
3147 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3148 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3150 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3159 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3160 was first seen in a non-ELF file. Fortunately, if the symbol
3161 was first seen in an ELF file, we're probably OK unless the
3162 symbol was defined in a non-ELF file. Catch that case here.
3163 FIXME: We're still in trouble if the symbol was first seen in
3164 a dynamic object, and then later in a non-ELF regular object. */
3165 if ((h
->root
.type
== bfd_link_hash_defined
3166 || h
->root
.type
== bfd_link_hash_defweak
)
3167 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3168 && (h
->root
.u
.def
.section
->owner
!= NULL
3169 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3170 != bfd_target_elf_flavour
)
3171 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3172 && (h
->elf_link_hash_flags
3173 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3174 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3177 /* If this is a final link, and the symbol was defined as a common
3178 symbol in a regular object file, and there was no definition in
3179 any dynamic object, then the linker will have allocated space for
3180 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3181 flag will not have been set. */
3182 if (h
->root
.type
== bfd_link_hash_defined
3183 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3184 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3185 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3186 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3187 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3189 /* If -Bsymbolic was used (which means to bind references to global
3190 symbols to the definition within the shared object), and this
3191 symbol was defined in a regular object, then it actually doesn't
3192 need a PLT entry. */
3193 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3194 && eif
->info
->shared
3195 && eif
->info
->symbolic
3196 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3198 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3199 h
->plt
.offset
= (bfd_vma
) -1;
3205 /* Make the backend pick a good value for a dynamic symbol. This is
3206 called via elf_link_hash_traverse, and also calls itself
3210 elf_adjust_dynamic_symbol (h
, data
)
3211 struct elf_link_hash_entry
*h
;
3214 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3216 struct elf_backend_data
*bed
;
3218 /* Ignore indirect symbols. These are added by the versioning code. */
3219 if (h
->root
.type
== bfd_link_hash_indirect
)
3222 /* Fix the symbol flags. */
3223 if (! elf_fix_symbol_flags (h
, eif
))
3226 /* If this symbol does not require a PLT entry, and it is not
3227 defined by a dynamic object, or is not referenced by a regular
3228 object, ignore it. We do have to handle a weak defined symbol,
3229 even if no regular object refers to it, if we decided to add it
3230 to the dynamic symbol table. FIXME: Do we normally need to worry
3231 about symbols which are defined by one dynamic object and
3232 referenced by another one? */
3233 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3234 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3235 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3236 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3237 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3239 h
->plt
.offset
= (bfd_vma
) -1;
3243 /* If we've already adjusted this symbol, don't do it again. This
3244 can happen via a recursive call. */
3245 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3248 /* Don't look at this symbol again. Note that we must set this
3249 after checking the above conditions, because we may look at a
3250 symbol once, decide not to do anything, and then get called
3251 recursively later after REF_REGULAR is set below. */
3252 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3254 /* If this is a weak definition, and we know a real definition, and
3255 the real symbol is not itself defined by a regular object file,
3256 then get a good value for the real definition. We handle the
3257 real symbol first, for the convenience of the backend routine.
3259 Note that there is a confusing case here. If the real definition
3260 is defined by a regular object file, we don't get the real symbol
3261 from the dynamic object, but we do get the weak symbol. If the
3262 processor backend uses a COPY reloc, then if some routine in the
3263 dynamic object changes the real symbol, we will not see that
3264 change in the corresponding weak symbol. This is the way other
3265 ELF linkers work as well, and seems to be a result of the shared
3268 I will clarify this issue. Most SVR4 shared libraries define the
3269 variable _timezone and define timezone as a weak synonym. The
3270 tzset call changes _timezone. If you write
3271 extern int timezone;
3273 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3274 you might expect that, since timezone is a synonym for _timezone,
3275 the same number will print both times. However, if the processor
3276 backend uses a COPY reloc, then actually timezone will be copied
3277 into your process image, and, since you define _timezone
3278 yourself, _timezone will not. Thus timezone and _timezone will
3279 wind up at different memory locations. The tzset call will set
3280 _timezone, leaving timezone unchanged. */
3282 if (h
->weakdef
!= NULL
)
3284 struct elf_link_hash_entry
*weakdef
;
3286 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3287 || h
->root
.type
== bfd_link_hash_defweak
);
3288 weakdef
= h
->weakdef
;
3289 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3290 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3291 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3292 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3294 /* This symbol is defined by a regular object file, so we
3295 will not do anything special. Clear weakdef for the
3296 convenience of the processor backend. */
3301 /* There is an implicit reference by a regular object file
3302 via the weak symbol. */
3303 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3304 if (h
->weakdef
->elf_link_hash_flags
3305 & ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3306 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3307 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
3312 /* If a symbol has no type and no size and does not require a PLT
3313 entry, then we are probably about to do the wrong thing here: we
3314 are probably going to create a COPY reloc for an empty object.
3315 This case can arise when a shared object is built with assembly
3316 code, and the assembly code fails to set the symbol type. */
3318 && h
->type
== STT_NOTYPE
3319 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3320 (*_bfd_error_handler
)
3321 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3322 h
->root
.root
.string
);
3324 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3325 bed
= get_elf_backend_data (dynobj
);
3326 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3335 /* This routine is used to export all defined symbols into the dynamic
3336 symbol table. It is called via elf_link_hash_traverse. */
3339 elf_export_symbol (h
, data
)
3340 struct elf_link_hash_entry
*h
;
3343 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3345 /* Ignore indirect symbols. These are added by the versioning code. */
3346 if (h
->root
.type
== bfd_link_hash_indirect
)
3349 if (h
->dynindx
== -1
3350 && (h
->elf_link_hash_flags
3351 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3353 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3363 /* Look through the symbols which are defined in other shared
3364 libraries and referenced here. Update the list of version
3365 dependencies. This will be put into the .gnu.version_r section.
3366 This function is called via elf_link_hash_traverse. */
3369 elf_link_find_version_dependencies (h
, data
)
3370 struct elf_link_hash_entry
*h
;
3373 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3374 Elf_Internal_Verneed
*t
;
3375 Elf_Internal_Vernaux
*a
;
3377 /* We only care about symbols defined in shared objects with version
3379 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3380 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3382 || h
->verinfo
.verdef
== NULL
)
3385 /* See if we already know about this version. */
3386 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3388 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3391 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3392 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3398 /* This is a new version. Add it to tree we are building. */
3402 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3405 rinfo
->failed
= true;
3409 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3410 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3411 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3414 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3416 /* Note that we are copying a string pointer here, and testing it
3417 above. If bfd_elf_string_from_elf_section is ever changed to
3418 discard the string data when low in memory, this will have to be
3420 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3422 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3423 a
->vna_nextptr
= t
->vn_auxptr
;
3425 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3428 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3435 /* Figure out appropriate versions for all the symbols. We may not
3436 have the version number script until we have read all of the input
3437 files, so until that point we don't know which symbols should be
3438 local. This function is called via elf_link_hash_traverse. */
3441 elf_link_assign_sym_version (h
, data
)
3442 struct elf_link_hash_entry
*h
;
3445 struct elf_assign_sym_version_info
*sinfo
=
3446 (struct elf_assign_sym_version_info
*) data
;
3447 struct bfd_link_info
*info
= sinfo
->info
;
3448 struct elf_info_failed eif
;
3451 /* Fix the symbol flags. */
3454 if (! elf_fix_symbol_flags (h
, &eif
))
3457 sinfo
->failed
= true;
3461 /* We only need version numbers for symbols defined in regular
3463 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3466 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3467 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3469 struct bfd_elf_version_tree
*t
;
3474 /* There are two consecutive ELF_VER_CHR characters if this is
3475 not a hidden symbol. */
3477 if (*p
== ELF_VER_CHR
)
3483 /* If there is no version string, we can just return out. */
3487 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3491 /* Look for the version. If we find it, it is no longer weak. */
3492 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3494 if (strcmp (t
->name
, p
) == 0)
3498 struct bfd_elf_version_expr
*d
;
3500 len
= p
- h
->root
.root
.string
;
3501 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3504 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3505 alc
[len
- 1] = '\0';
3506 if (alc
[len
- 2] == ELF_VER_CHR
)
3507 alc
[len
- 2] = '\0';
3509 h
->verinfo
.vertree
= t
;
3513 if (t
->globals
!= NULL
)
3515 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3516 if ((*d
->match
) (d
, alc
))
3520 /* See if there is anything to force this symbol to
3522 if (d
== NULL
&& t
->locals
!= NULL
)
3524 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3526 if ((*d
->match
) (d
, alc
))
3528 if (h
->dynindx
!= -1
3530 && ! sinfo
->export_dynamic
)
3532 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3533 h
->elf_link_hash_flags
&=~
3534 ELF_LINK_HASH_NEEDS_PLT
;
3536 h
->plt
.offset
= (bfd_vma
) -1;
3537 /* FIXME: The name of the symbol has
3538 already been recorded in the dynamic
3539 string table section. */
3547 bfd_release (sinfo
->output_bfd
, alc
);
3552 /* If we are building an application, we need to create a
3553 version node for this version. */
3554 if (t
== NULL
&& ! info
->shared
)
3556 struct bfd_elf_version_tree
**pp
;
3559 /* If we aren't going to export this symbol, we don't need
3560 to worry about it. */
3561 if (h
->dynindx
== -1)
3564 t
= ((struct bfd_elf_version_tree
*)
3565 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3568 sinfo
->failed
= true;
3577 t
->name_indx
= (unsigned int) -1;
3581 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3583 t
->vernum
= version_index
;
3587 h
->verinfo
.vertree
= t
;
3591 /* We could not find the version for a symbol when
3592 generating a shared archive. Return an error. */
3593 (*_bfd_error_handler
)
3594 (_("%s: undefined versioned symbol name %s"),
3595 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3596 bfd_set_error (bfd_error_bad_value
);
3597 sinfo
->failed
= true;
3602 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3605 /* If we don't have a version for this symbol, see if we can find
3607 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3609 struct bfd_elf_version_tree
*t
;
3610 struct bfd_elf_version_tree
*deflt
;
3611 struct bfd_elf_version_expr
*d
;
3613 /* See if can find what version this symbol is in. If the
3614 symbol is supposed to be local, then don't actually register
3617 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3619 if (t
->globals
!= NULL
)
3621 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3623 if ((*d
->match
) (d
, h
->root
.root
.string
))
3625 h
->verinfo
.vertree
= t
;
3634 if (t
->locals
!= NULL
)
3636 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3638 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3640 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3642 h
->verinfo
.vertree
= t
;
3643 if (h
->dynindx
!= -1
3645 && ! sinfo
->export_dynamic
)
3647 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3648 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3650 h
->plt
.offset
= (bfd_vma
) -1;
3651 /* FIXME: The name of the symbol has already
3652 been recorded in the dynamic string table
3664 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3666 h
->verinfo
.vertree
= deflt
;
3667 if (h
->dynindx
!= -1
3669 && ! sinfo
->export_dynamic
)
3671 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3672 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3674 h
->plt
.offset
= (bfd_vma
) -1;
3675 /* FIXME: The name of the symbol has already been
3676 recorded in the dynamic string table section. */
3684 /* Final phase of ELF linker. */
3686 /* A structure we use to avoid passing large numbers of arguments. */
3688 struct elf_final_link_info
3690 /* General link information. */
3691 struct bfd_link_info
*info
;
3694 /* Symbol string table. */
3695 struct bfd_strtab_hash
*symstrtab
;
3696 /* .dynsym section. */
3697 asection
*dynsym_sec
;
3698 /* .hash section. */
3700 /* symbol version section (.gnu.version). */
3701 asection
*symver_sec
;
3702 /* Buffer large enough to hold contents of any section. */
3704 /* Buffer large enough to hold external relocs of any section. */
3705 PTR external_relocs
;
3706 /* Buffer large enough to hold internal relocs of any section. */
3707 Elf_Internal_Rela
*internal_relocs
;
3708 /* Buffer large enough to hold external local symbols of any input
3710 Elf_External_Sym
*external_syms
;
3711 /* Buffer large enough to hold internal local symbols of any input
3713 Elf_Internal_Sym
*internal_syms
;
3714 /* Array large enough to hold a symbol index for each local symbol
3715 of any input BFD. */
3717 /* Array large enough to hold a section pointer for each local
3718 symbol of any input BFD. */
3719 asection
**sections
;
3720 /* Buffer to hold swapped out symbols. */
3721 Elf_External_Sym
*symbuf
;
3722 /* Number of swapped out symbols in buffer. */
3723 size_t symbuf_count
;
3724 /* Number of symbols which fit in symbuf. */
3728 static boolean elf_link_output_sym
3729 PARAMS ((struct elf_final_link_info
*, const char *,
3730 Elf_Internal_Sym
*, asection
*));
3731 static boolean elf_link_flush_output_syms
3732 PARAMS ((struct elf_final_link_info
*));
3733 static boolean elf_link_output_extsym
3734 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3735 static boolean elf_link_input_bfd
3736 PARAMS ((struct elf_final_link_info
*, bfd
*));
3737 static boolean elf_reloc_link_order
3738 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3739 struct bfd_link_order
*));
3741 /* This struct is used to pass information to elf_link_output_extsym. */
3743 struct elf_outext_info
3747 struct elf_final_link_info
*finfo
;
3750 /* Compute the size of, and allocate space for, REL_HDR which is the
3751 section header for a section containing relocations for O. */
3754 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
3756 Elf_Internal_Shdr
*rel_hdr
;
3759 register struct elf_link_hash_entry
**p
, **pend
;
3761 /* We are overestimating the size required for the relocation
3762 sections, in the case that we are using both REL and RELA
3763 relocations for a single section. In that case, RELOC_COUNT will
3764 be the total number of relocations required, and we allocate
3765 space for that many REL relocations as well as that many RELA
3766 relocations. This approximation is wasteful of disk space.
3767 However, until we keep track of how many of each kind of
3768 relocation is required, it's difficult to calculate the right
3770 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3772 /* The contents field must last into write_object_contents, so we
3773 allocate it with bfd_alloc rather than malloc. */
3774 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3775 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3778 p
= ((struct elf_link_hash_entry
**)
3779 bfd_malloc (o
->reloc_count
3780 * sizeof (struct elf_link_hash_entry
*)));
3781 if (p
== NULL
&& o
->reloc_count
!= 0)
3784 elf_section_data (o
)->rel_hashes
= p
;
3785 pend
= p
+ o
->reloc_count
;
3786 for (; p
< pend
; p
++)
3792 /* When performing a relocateable link, the input relocations are
3793 preserved. But, if they reference global symbols, the indices
3794 referenced must be updated. Update all the relocations in
3795 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
3798 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
3800 Elf_Internal_Shdr
*rel_hdr
;
3802 struct elf_link_hash_entry
**rel_hash
;
3806 for (i
= 0; i
< count
; i
++, rel_hash
++)
3808 if (*rel_hash
== NULL
)
3811 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3813 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3815 Elf_External_Rel
*erel
;
3816 Elf_Internal_Rel irel
;
3818 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3819 elf_swap_reloc_in (abfd
, erel
, &irel
);
3820 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3821 ELF_R_TYPE (irel
.r_info
));
3822 elf_swap_reloc_out (abfd
, &irel
, erel
);
3826 Elf_External_Rela
*erela
;
3827 Elf_Internal_Rela irela
;
3829 BFD_ASSERT (rel_hdr
->sh_entsize
3830 == sizeof (Elf_External_Rela
));
3832 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3833 elf_swap_reloca_in (abfd
, erela
, &irela
);
3834 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3835 ELF_R_TYPE (irela
.r_info
));
3836 elf_swap_reloca_out (abfd
, &irela
, erela
);
3841 /* Do the final step of an ELF link. */
3844 elf_bfd_final_link (abfd
, info
)
3846 struct bfd_link_info
*info
;
3850 struct elf_final_link_info finfo
;
3851 register asection
*o
;
3852 register struct bfd_link_order
*p
;
3854 size_t max_contents_size
;
3855 size_t max_external_reloc_size
;
3856 size_t max_internal_reloc_count
;
3857 size_t max_sym_count
;
3859 Elf_Internal_Sym elfsym
;
3861 Elf_Internal_Shdr
*symtab_hdr
;
3862 Elf_Internal_Shdr
*symstrtab_hdr
;
3863 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3864 struct elf_outext_info eoinfo
;
3867 abfd
->flags
|= DYNAMIC
;
3869 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3870 dynobj
= elf_hash_table (info
)->dynobj
;
3873 finfo
.output_bfd
= abfd
;
3874 finfo
.symstrtab
= elf_stringtab_init ();
3875 if (finfo
.symstrtab
== NULL
)
3880 finfo
.dynsym_sec
= NULL
;
3881 finfo
.hash_sec
= NULL
;
3882 finfo
.symver_sec
= NULL
;
3886 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3887 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3888 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3889 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3890 /* Note that it is OK if symver_sec is NULL. */
3893 finfo
.contents
= NULL
;
3894 finfo
.external_relocs
= NULL
;
3895 finfo
.internal_relocs
= NULL
;
3896 finfo
.external_syms
= NULL
;
3897 finfo
.internal_syms
= NULL
;
3898 finfo
.indices
= NULL
;
3899 finfo
.sections
= NULL
;
3900 finfo
.symbuf
= NULL
;
3901 finfo
.symbuf_count
= 0;
3903 /* Count up the number of relocations we will output for each output
3904 section, so that we know the sizes of the reloc sections. We
3905 also figure out some maximum sizes. */
3906 max_contents_size
= 0;
3907 max_external_reloc_size
= 0;
3908 max_internal_reloc_count
= 0;
3910 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3914 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3916 if (p
->type
== bfd_section_reloc_link_order
3917 || p
->type
== bfd_symbol_reloc_link_order
)
3919 else if (p
->type
== bfd_indirect_link_order
)
3923 sec
= p
->u
.indirect
.section
;
3925 /* Mark all sections which are to be included in the
3926 link. This will normally be every section. We need
3927 to do this so that we can identify any sections which
3928 the linker has decided to not include. */
3929 sec
->linker_mark
= true;
3931 if (info
->relocateable
)
3932 o
->reloc_count
+= sec
->reloc_count
;
3934 if (sec
->_raw_size
> max_contents_size
)
3935 max_contents_size
= sec
->_raw_size
;
3936 if (sec
->_cooked_size
> max_contents_size
)
3937 max_contents_size
= sec
->_cooked_size
;
3939 /* We are interested in just local symbols, not all
3941 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3942 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3946 if (elf_bad_symtab (sec
->owner
))
3947 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3948 / sizeof (Elf_External_Sym
));
3950 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3952 if (sym_count
> max_sym_count
)
3953 max_sym_count
= sym_count
;
3955 if ((sec
->flags
& SEC_RELOC
) != 0)
3959 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3960 if (ext_size
> max_external_reloc_size
)
3961 max_external_reloc_size
= ext_size
;
3962 if (sec
->reloc_count
> max_internal_reloc_count
)
3963 max_internal_reloc_count
= sec
->reloc_count
;
3969 if (o
->reloc_count
> 0)
3970 o
->flags
|= SEC_RELOC
;
3973 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3974 set it (this is probably a bug) and if it is set
3975 assign_section_numbers will create a reloc section. */
3976 o
->flags
&=~ SEC_RELOC
;
3979 /* If the SEC_ALLOC flag is not set, force the section VMA to
3980 zero. This is done in elf_fake_sections as well, but forcing
3981 the VMA to 0 here will ensure that relocs against these
3982 sections are handled correctly. */
3983 if ((o
->flags
& SEC_ALLOC
) == 0
3984 && ! o
->user_set_vma
)
3988 /* Figure out the file positions for everything but the symbol table
3989 and the relocs. We set symcount to force assign_section_numbers
3990 to create a symbol table. */
3991 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
3992 BFD_ASSERT (! abfd
->output_has_begun
);
3993 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3996 /* That created the reloc sections. Set their sizes, and assign
3997 them file positions, and allocate some buffers. */
3998 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4000 if ((o
->flags
& SEC_RELOC
) != 0)
4002 if (!elf_link_size_reloc_section (abfd
,
4003 &elf_section_data (o
)->rel_hdr
,
4007 if (elf_section_data (o
)->rel_hdr2
4008 && !elf_link_size_reloc_section (abfd
,
4009 elf_section_data (o
)->rel_hdr2
,
4015 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4017 /* We have now assigned file positions for all the sections except
4018 .symtab and .strtab. We start the .symtab section at the current
4019 file position, and write directly to it. We build the .strtab
4020 section in memory. */
4021 bfd_get_symcount (abfd
) = 0;
4022 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4023 /* sh_name is set in prep_headers. */
4024 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4025 symtab_hdr
->sh_flags
= 0;
4026 symtab_hdr
->sh_addr
= 0;
4027 symtab_hdr
->sh_size
= 0;
4028 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4029 /* sh_link is set in assign_section_numbers. */
4030 /* sh_info is set below. */
4031 /* sh_offset is set just below. */
4032 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4034 off
= elf_tdata (abfd
)->next_file_pos
;
4035 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4037 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4038 incorrect. We do not yet know the size of the .symtab section.
4039 We correct next_file_pos below, after we do know the size. */
4041 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4042 continuously seeking to the right position in the file. */
4043 if (! info
->keep_memory
|| max_sym_count
< 20)
4044 finfo
.symbuf_size
= 20;
4046 finfo
.symbuf_size
= max_sym_count
;
4047 finfo
.symbuf
= ((Elf_External_Sym
*)
4048 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4049 if (finfo
.symbuf
== NULL
)
4052 /* Start writing out the symbol table. The first symbol is always a
4054 if (info
->strip
!= strip_all
|| info
->relocateable
)
4056 elfsym
.st_value
= 0;
4059 elfsym
.st_other
= 0;
4060 elfsym
.st_shndx
= SHN_UNDEF
;
4061 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4062 &elfsym
, bfd_und_section_ptr
))
4067 /* Some standard ELF linkers do this, but we don't because it causes
4068 bootstrap comparison failures. */
4069 /* Output a file symbol for the output file as the second symbol.
4070 We output this even if we are discarding local symbols, although
4071 I'm not sure if this is correct. */
4072 elfsym
.st_value
= 0;
4074 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4075 elfsym
.st_other
= 0;
4076 elfsym
.st_shndx
= SHN_ABS
;
4077 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4078 &elfsym
, bfd_abs_section_ptr
))
4082 /* Output a symbol for each section. We output these even if we are
4083 discarding local symbols, since they are used for relocs. These
4084 symbols have no names. We store the index of each one in the
4085 index field of the section, so that we can find it again when
4086 outputting relocs. */
4087 if (info
->strip
!= strip_all
|| info
->relocateable
)
4090 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4091 elfsym
.st_other
= 0;
4092 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4094 o
= section_from_elf_index (abfd
, i
);
4096 o
->target_index
= bfd_get_symcount (abfd
);
4097 elfsym
.st_shndx
= i
;
4098 if (info
->relocateable
|| o
== NULL
)
4099 elfsym
.st_value
= 0;
4101 elfsym
.st_value
= o
->vma
;
4102 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4108 /* Allocate some memory to hold information read in from the input
4110 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4111 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4112 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4113 bfd_malloc (max_internal_reloc_count
4114 * sizeof (Elf_Internal_Rela
)
4115 * bed
->s
->int_rels_per_ext_rel
));
4116 finfo
.external_syms
= ((Elf_External_Sym
*)
4117 bfd_malloc (max_sym_count
4118 * sizeof (Elf_External_Sym
)));
4119 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4120 bfd_malloc (max_sym_count
4121 * sizeof (Elf_Internal_Sym
)));
4122 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4123 finfo
.sections
= ((asection
**)
4124 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4125 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4126 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4127 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4128 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4129 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4130 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4131 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4134 /* Since ELF permits relocations to be against local symbols, we
4135 must have the local symbols available when we do the relocations.
4136 Since we would rather only read the local symbols once, and we
4137 would rather not keep them in memory, we handle all the
4138 relocations for a single input file at the same time.
4140 Unfortunately, there is no way to know the total number of local
4141 symbols until we have seen all of them, and the local symbol
4142 indices precede the global symbol indices. This means that when
4143 we are generating relocateable output, and we see a reloc against
4144 a global symbol, we can not know the symbol index until we have
4145 finished examining all the local symbols to see which ones we are
4146 going to output. To deal with this, we keep the relocations in
4147 memory, and don't output them until the end of the link. This is
4148 an unfortunate waste of memory, but I don't see a good way around
4149 it. Fortunately, it only happens when performing a relocateable
4150 link, which is not the common case. FIXME: If keep_memory is set
4151 we could write the relocs out and then read them again; I don't
4152 know how bad the memory loss will be. */
4154 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4155 sub
->output_has_begun
= false;
4156 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4158 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4160 if (p
->type
== bfd_indirect_link_order
4161 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4162 == bfd_target_elf_flavour
))
4164 sub
= p
->u
.indirect
.section
->owner
;
4165 if (! sub
->output_has_begun
)
4167 if (! elf_link_input_bfd (&finfo
, sub
))
4169 sub
->output_has_begun
= true;
4172 else if (p
->type
== bfd_section_reloc_link_order
4173 || p
->type
== bfd_symbol_reloc_link_order
)
4175 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4180 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4186 /* That wrote out all the local symbols. Finish up the symbol table
4187 with the global symbols. */
4189 if (info
->strip
!= strip_all
&& info
->shared
)
4191 /* Output any global symbols that got converted to local in a
4192 version script. We do this in a separate step since ELF
4193 requires all local symbols to appear prior to any global
4194 symbols. FIXME: We should only do this if some global
4195 symbols were, in fact, converted to become local. FIXME:
4196 Will this work correctly with the Irix 5 linker? */
4197 eoinfo
.failed
= false;
4198 eoinfo
.finfo
= &finfo
;
4199 eoinfo
.localsyms
= true;
4200 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4206 /* The sh_info field records the index of the first non local symbol. */
4207 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4211 Elf_Internal_Sym sym
;
4212 Elf_External_Sym
*dynsym
=
4213 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4214 unsigned long last_local
= 0;
4216 /* Write out the section symbols for the output sections. */
4223 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4226 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4229 indx
= elf_section_data (s
)->this_idx
;
4230 BFD_ASSERT (indx
> 0);
4231 sym
.st_shndx
= indx
;
4232 sym
.st_value
= s
->vma
;
4234 elf_swap_symbol_out (abfd
, &sym
,
4235 dynsym
+ elf_section_data (s
)->dynindx
);
4238 last_local
= bfd_count_sections (abfd
);
4241 /* Write out the local dynsyms. */
4242 if (elf_hash_table (info
)->dynlocal
)
4244 struct elf_link_local_dynamic_entry
*e
;
4245 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4249 sym
.st_size
= e
->isym
.st_size
;
4250 sym
.st_other
= e
->isym
.st_other
;
4252 /* Note that we saved a word of storage and overwrote
4253 the original st_name with the dynstr_index. */
4254 sym
.st_name
= e
->isym
.st_name
;
4256 /* Whatever binding the symbol had before, it's now local. */
4257 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
,
4258 ELF_ST_TYPE (e
->isym
.st_info
));
4260 s
= bfd_section_from_elf_index (e
->input_bfd
, e
->isym
.st_shndx
);
4262 sym
.st_shndx
= elf_section_data (s
->output_section
)->this_idx
;
4263 sym
.st_value
= (s
->output_section
->vma
4265 + e
->isym
.st_value
);
4267 if (last_local
< e
->dynindx
)
4268 last_local
= e
->dynindx
;
4270 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4274 elf_section_data (finfo
.dynsym_sec
->output_section
)
4275 ->this_hdr
.sh_info
= last_local
;
4278 /* We get the global symbols from the hash table. */
4279 eoinfo
.failed
= false;
4280 eoinfo
.localsyms
= false;
4281 eoinfo
.finfo
= &finfo
;
4282 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4287 /* Flush all symbols to the file. */
4288 if (! elf_link_flush_output_syms (&finfo
))
4291 /* Now we know the size of the symtab section. */
4292 off
+= symtab_hdr
->sh_size
;
4294 /* Finish up and write out the symbol string table (.strtab)
4296 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4297 /* sh_name was set in prep_headers. */
4298 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4299 symstrtab_hdr
->sh_flags
= 0;
4300 symstrtab_hdr
->sh_addr
= 0;
4301 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4302 symstrtab_hdr
->sh_entsize
= 0;
4303 symstrtab_hdr
->sh_link
= 0;
4304 symstrtab_hdr
->sh_info
= 0;
4305 /* sh_offset is set just below. */
4306 symstrtab_hdr
->sh_addralign
= 1;
4308 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4309 elf_tdata (abfd
)->next_file_pos
= off
;
4311 if (bfd_get_symcount (abfd
) > 0)
4313 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4314 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4318 /* Adjust the relocs to have the correct symbol indices. */
4319 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4321 if ((o
->flags
& SEC_RELOC
) == 0)
4324 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4325 elf_section_data (o
)->rel_count
,
4326 elf_section_data (o
)->rel_hashes
);
4327 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4328 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4329 elf_section_data (o
)->rel_count2
,
4330 (elf_section_data (o
)->rel_hashes
4331 + elf_section_data (o
)->rel_count
));
4333 /* Set the reloc_count field to 0 to prevent write_relocs from
4334 trying to swap the relocs out itself. */
4338 /* If we are linking against a dynamic object, or generating a
4339 shared library, finish up the dynamic linking information. */
4342 Elf_External_Dyn
*dyncon
, *dynconend
;
4344 /* Fix up .dynamic entries. */
4345 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4346 BFD_ASSERT (o
!= NULL
);
4348 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4349 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4350 for (; dyncon
< dynconend
; dyncon
++)
4352 Elf_Internal_Dyn dyn
;
4356 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4363 name
= info
->init_function
;
4366 name
= info
->fini_function
;
4369 struct elf_link_hash_entry
*h
;
4371 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4372 false, false, true);
4374 && (h
->root
.type
== bfd_link_hash_defined
4375 || h
->root
.type
== bfd_link_hash_defweak
))
4377 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4378 o
= h
->root
.u
.def
.section
;
4379 if (o
->output_section
!= NULL
)
4380 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4381 + o
->output_offset
);
4384 /* The symbol is imported from another shared
4385 library and does not apply to this one. */
4389 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4404 name
= ".gnu.version_d";
4407 name
= ".gnu.version_r";
4410 name
= ".gnu.version";
4412 o
= bfd_get_section_by_name (abfd
, name
);
4413 BFD_ASSERT (o
!= NULL
);
4414 dyn
.d_un
.d_ptr
= o
->vma
;
4415 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4422 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4427 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4429 Elf_Internal_Shdr
*hdr
;
4431 hdr
= elf_elfsections (abfd
)[i
];
4432 if (hdr
->sh_type
== type
4433 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4435 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4436 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4439 if (dyn
.d_un
.d_val
== 0
4440 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4441 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4445 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4451 /* If we have created any dynamic sections, then output them. */
4454 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4457 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4459 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4460 || o
->_raw_size
== 0)
4462 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4464 /* At this point, we are only interested in sections
4465 created by elf_link_create_dynamic_sections. */
4468 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4470 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4472 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4473 o
->contents
, o
->output_offset
,
4481 /* The contents of the .dynstr section are actually in a
4483 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4484 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4485 || ! _bfd_stringtab_emit (abfd
,
4486 elf_hash_table (info
)->dynstr
))
4492 /* If we have optimized stabs strings, output them. */
4493 if (elf_hash_table (info
)->stab_info
!= NULL
)
4495 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4499 if (finfo
.symstrtab
!= NULL
)
4500 _bfd_stringtab_free (finfo
.symstrtab
);
4501 if (finfo
.contents
!= NULL
)
4502 free (finfo
.contents
);
4503 if (finfo
.external_relocs
!= NULL
)
4504 free (finfo
.external_relocs
);
4505 if (finfo
.internal_relocs
!= NULL
)
4506 free (finfo
.internal_relocs
);
4507 if (finfo
.external_syms
!= NULL
)
4508 free (finfo
.external_syms
);
4509 if (finfo
.internal_syms
!= NULL
)
4510 free (finfo
.internal_syms
);
4511 if (finfo
.indices
!= NULL
)
4512 free (finfo
.indices
);
4513 if (finfo
.sections
!= NULL
)
4514 free (finfo
.sections
);
4515 if (finfo
.symbuf
!= NULL
)
4516 free (finfo
.symbuf
);
4517 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4519 if ((o
->flags
& SEC_RELOC
) != 0
4520 && elf_section_data (o
)->rel_hashes
!= NULL
)
4521 free (elf_section_data (o
)->rel_hashes
);
4524 elf_tdata (abfd
)->linker
= true;
4529 if (finfo
.symstrtab
!= NULL
)
4530 _bfd_stringtab_free (finfo
.symstrtab
);
4531 if (finfo
.contents
!= NULL
)
4532 free (finfo
.contents
);
4533 if (finfo
.external_relocs
!= NULL
)
4534 free (finfo
.external_relocs
);
4535 if (finfo
.internal_relocs
!= NULL
)
4536 free (finfo
.internal_relocs
);
4537 if (finfo
.external_syms
!= NULL
)
4538 free (finfo
.external_syms
);
4539 if (finfo
.internal_syms
!= NULL
)
4540 free (finfo
.internal_syms
);
4541 if (finfo
.indices
!= NULL
)
4542 free (finfo
.indices
);
4543 if (finfo
.sections
!= NULL
)
4544 free (finfo
.sections
);
4545 if (finfo
.symbuf
!= NULL
)
4546 free (finfo
.symbuf
);
4547 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4549 if ((o
->flags
& SEC_RELOC
) != 0
4550 && elf_section_data (o
)->rel_hashes
!= NULL
)
4551 free (elf_section_data (o
)->rel_hashes
);
4557 /* Add a symbol to the output symbol table. */
4560 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4561 struct elf_final_link_info
*finfo
;
4563 Elf_Internal_Sym
*elfsym
;
4564 asection
*input_sec
;
4566 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4567 struct bfd_link_info
*info
,
4572 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4573 elf_backend_link_output_symbol_hook
;
4574 if (output_symbol_hook
!= NULL
)
4576 if (! ((*output_symbol_hook
)
4577 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4581 if (name
== (const char *) NULL
|| *name
== '\0')
4582 elfsym
->st_name
= 0;
4583 else if (input_sec
->flags
& SEC_EXCLUDE
)
4584 elfsym
->st_name
= 0;
4587 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4590 if (elfsym
->st_name
== (unsigned long) -1)
4594 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4596 if (! elf_link_flush_output_syms (finfo
))
4600 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4601 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4602 ++finfo
->symbuf_count
;
4604 ++ bfd_get_symcount (finfo
->output_bfd
);
4609 /* Flush the output symbols to the file. */
4612 elf_link_flush_output_syms (finfo
)
4613 struct elf_final_link_info
*finfo
;
4615 if (finfo
->symbuf_count
> 0)
4617 Elf_Internal_Shdr
*symtab
;
4619 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4621 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4623 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4624 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4625 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4628 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4630 finfo
->symbuf_count
= 0;
4636 /* Add an external symbol to the symbol table. This is called from
4637 the hash table traversal routine. When generating a shared object,
4638 we go through the symbol table twice. The first time we output
4639 anything that might have been forced to local scope in a version
4640 script. The second time we output the symbols that are still
4644 elf_link_output_extsym (h
, data
)
4645 struct elf_link_hash_entry
*h
;
4648 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4649 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4651 Elf_Internal_Sym sym
;
4652 asection
*input_sec
;
4654 /* Decide whether to output this symbol in this pass. */
4655 if (eoinfo
->localsyms
)
4657 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4662 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4666 /* If we are not creating a shared library, and this symbol is
4667 referenced by a shared library but is not defined anywhere, then
4668 warn that it is undefined. If we do not do this, the runtime
4669 linker will complain that the symbol is undefined when the
4670 program is run. We don't have to worry about symbols that are
4671 referenced by regular files, because we will already have issued
4672 warnings for them. */
4673 if (! finfo
->info
->relocateable
4674 && ! (finfo
->info
->shared
4675 && !finfo
->info
->no_undefined
)
4676 && h
->root
.type
== bfd_link_hash_undefined
4677 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4678 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4680 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4681 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4682 (asection
*) NULL
, 0)))
4684 eoinfo
->failed
= true;
4689 /* We don't want to output symbols that have never been mentioned by
4690 a regular file, or that we have been told to strip. However, if
4691 h->indx is set to -2, the symbol is used by a reloc and we must
4695 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4696 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4697 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4698 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4700 else if (finfo
->info
->strip
== strip_all
4701 || (finfo
->info
->strip
== strip_some
4702 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4703 h
->root
.root
.string
,
4704 false, false) == NULL
))
4709 /* If we're stripping it, and it's not a dynamic symbol, there's
4710 nothing else to do. */
4711 if (strip
&& h
->dynindx
== -1)
4715 sym
.st_size
= h
->size
;
4716 sym
.st_other
= h
->other
;
4717 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4718 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4719 else if (h
->root
.type
== bfd_link_hash_undefweak
4720 || h
->root
.type
== bfd_link_hash_defweak
)
4721 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4723 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4725 switch (h
->root
.type
)
4728 case bfd_link_hash_new
:
4732 case bfd_link_hash_undefined
:
4733 input_sec
= bfd_und_section_ptr
;
4734 sym
.st_shndx
= SHN_UNDEF
;
4737 case bfd_link_hash_undefweak
:
4738 input_sec
= bfd_und_section_ptr
;
4739 sym
.st_shndx
= SHN_UNDEF
;
4742 case bfd_link_hash_defined
:
4743 case bfd_link_hash_defweak
:
4745 input_sec
= h
->root
.u
.def
.section
;
4746 if (input_sec
->output_section
!= NULL
)
4749 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4750 input_sec
->output_section
);
4751 if (sym
.st_shndx
== (unsigned short) -1)
4753 (*_bfd_error_handler
)
4754 (_("%s: could not find output section %s for input section %s"),
4755 bfd_get_filename (finfo
->output_bfd
),
4756 input_sec
->output_section
->name
,
4758 eoinfo
->failed
= true;
4762 /* ELF symbols in relocateable files are section relative,
4763 but in nonrelocateable files they are virtual
4765 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4766 if (! finfo
->info
->relocateable
)
4767 sym
.st_value
+= input_sec
->output_section
->vma
;
4771 BFD_ASSERT (input_sec
->owner
== NULL
4772 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4773 sym
.st_shndx
= SHN_UNDEF
;
4774 input_sec
= bfd_und_section_ptr
;
4779 case bfd_link_hash_common
:
4780 input_sec
= h
->root
.u
.c
.p
->section
;
4781 sym
.st_shndx
= SHN_COMMON
;
4782 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4785 case bfd_link_hash_indirect
:
4786 /* These symbols are created by symbol versioning. They point
4787 to the decorated version of the name. For example, if the
4788 symbol foo@@GNU_1.2 is the default, which should be used when
4789 foo is used with no version, then we add an indirect symbol
4790 foo which points to foo@@GNU_1.2. We ignore these symbols,
4791 since the indirected symbol is already in the hash table. If
4792 the indirect symbol is non-ELF, fall through and output it. */
4793 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4797 case bfd_link_hash_warning
:
4798 /* We can't represent these symbols in ELF, although a warning
4799 symbol may have come from a .gnu.warning.SYMBOL section. We
4800 just put the target symbol in the hash table. If the target
4801 symbol does not really exist, don't do anything. */
4802 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4804 return (elf_link_output_extsym
4805 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4808 /* Give the processor backend a chance to tweak the symbol value,
4809 and also to finish up anything that needs to be done for this
4811 if ((h
->dynindx
!= -1
4812 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4813 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4815 struct elf_backend_data
*bed
;
4817 bed
= get_elf_backend_data (finfo
->output_bfd
);
4818 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4819 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4821 eoinfo
->failed
= true;
4826 /* If we are marking the symbol as undefined, and there are no
4827 non-weak references to this symbol from a regular object, then
4828 mark the symbol as weak undefined. We can't do this earlier,
4829 because it might not be marked as undefined until the
4830 finish_dynamic_symbol routine gets through with it. */
4831 if (sym
.st_shndx
== SHN_UNDEF
4832 && sym
.st_info
== ELF_ST_INFO (STB_GLOBAL
, h
->type
)
4833 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
4834 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) == 0)
4835 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4837 /* If this symbol should be put in the .dynsym section, then put it
4838 there now. We have already know the symbol index. We also fill
4839 in the entry in the .hash section. */
4840 if (h
->dynindx
!= -1
4841 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4845 size_t hash_entry_size
;
4846 bfd_byte
*bucketpos
;
4849 sym
.st_name
= h
->dynstr_index
;
4851 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4852 (PTR
) (((Elf_External_Sym
*)
4853 finfo
->dynsym_sec
->contents
)
4856 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4857 bucket
= h
->elf_hash_value
% bucketcount
;
4859 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
4860 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4861 + (bucket
+ 2) * hash_entry_size
);
4862 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
4863 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4864 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
4865 ((bfd_byte
*) finfo
->hash_sec
->contents
4866 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
4868 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4870 Elf_Internal_Versym iversym
;
4872 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4874 if (h
->verinfo
.verdef
== NULL
)
4875 iversym
.vs_vers
= 0;
4877 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4881 if (h
->verinfo
.vertree
== NULL
)
4882 iversym
.vs_vers
= 1;
4884 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4887 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4888 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4890 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4891 (((Elf_External_Versym
*)
4892 finfo
->symver_sec
->contents
)
4897 /* If we're stripping it, then it was just a dynamic symbol, and
4898 there's nothing else to do. */
4902 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
4904 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4906 eoinfo
->failed
= true;
4913 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
4914 originated from the section given by INPUT_REL_HDR) to the
4918 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
4921 asection
*input_section
;
4922 Elf_Internal_Shdr
*input_rel_hdr
;
4923 Elf_Internal_Rela
*internal_relocs
;
4925 Elf_Internal_Rela
*irela
;
4926 Elf_Internal_Rela
*irelaend
;
4927 Elf_Internal_Shdr
*output_rel_hdr
;
4928 asection
*output_section
;
4929 unsigned int *rel_countp
= NULL
;
4931 output_section
= input_section
->output_section
;
4932 output_rel_hdr
= NULL
;
4934 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
4935 == input_rel_hdr
->sh_entsize
)
4937 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4938 rel_countp
= &elf_section_data (output_section
)->rel_count
;
4940 else if (elf_section_data (output_section
)->rel_hdr2
4941 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
4942 == input_rel_hdr
->sh_entsize
))
4944 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
4945 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
4948 BFD_ASSERT (output_rel_hdr
!= NULL
);
4950 irela
= internal_relocs
;
4951 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
4952 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4954 Elf_External_Rel
*erel
;
4956 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
4957 for (; irela
< irelaend
; irela
++, erel
++)
4959 Elf_Internal_Rel irel
;
4961 irel
.r_offset
= irela
->r_offset
;
4962 irel
.r_info
= irela
->r_info
;
4963 BFD_ASSERT (irela
->r_addend
== 0);
4964 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4969 Elf_External_Rela
*erela
;
4971 BFD_ASSERT (input_rel_hdr
->sh_entsize
4972 == sizeof (Elf_External_Rela
));
4973 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
4974 for (; irela
< irelaend
; irela
++, erela
++)
4975 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4978 /* Bump the counter, so that we know where to add the next set of
4980 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
4983 /* Link an input file into the linker output file. This function
4984 handles all the sections and relocations of the input file at once.
4985 This is so that we only have to read the local symbols once, and
4986 don't have to keep them in memory. */
4989 elf_link_input_bfd (finfo
, input_bfd
)
4990 struct elf_final_link_info
*finfo
;
4993 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4994 bfd
*, asection
*, bfd_byte
*,
4995 Elf_Internal_Rela
*,
4996 Elf_Internal_Sym
*, asection
**));
4998 Elf_Internal_Shdr
*symtab_hdr
;
5001 Elf_External_Sym
*external_syms
;
5002 Elf_External_Sym
*esym
;
5003 Elf_External_Sym
*esymend
;
5004 Elf_Internal_Sym
*isym
;
5006 asection
**ppsection
;
5008 struct elf_backend_data
*bed
;
5010 output_bfd
= finfo
->output_bfd
;
5011 bed
= get_elf_backend_data (output_bfd
);
5012 relocate_section
= bed
->elf_backend_relocate_section
;
5014 /* If this is a dynamic object, we don't want to do anything here:
5015 we don't want the local symbols, and we don't want the section
5017 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5020 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5021 if (elf_bad_symtab (input_bfd
))
5023 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5028 locsymcount
= symtab_hdr
->sh_info
;
5029 extsymoff
= symtab_hdr
->sh_info
;
5032 /* Read the local symbols. */
5033 if (symtab_hdr
->contents
!= NULL
)
5034 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5035 else if (locsymcount
== 0)
5036 external_syms
= NULL
;
5039 external_syms
= finfo
->external_syms
;
5040 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5041 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5042 locsymcount
, input_bfd
)
5043 != locsymcount
* sizeof (Elf_External_Sym
)))
5047 /* Swap in the local symbols and write out the ones which we know
5048 are going into the output file. */
5049 esym
= external_syms
;
5050 esymend
= esym
+ locsymcount
;
5051 isym
= finfo
->internal_syms
;
5052 pindex
= finfo
->indices
;
5053 ppsection
= finfo
->sections
;
5054 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5058 Elf_Internal_Sym osym
;
5060 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5063 if (elf_bad_symtab (input_bfd
))
5065 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5072 if (isym
->st_shndx
== SHN_UNDEF
)
5073 isec
= bfd_und_section_ptr
;
5074 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5075 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5076 else if (isym
->st_shndx
== SHN_ABS
)
5077 isec
= bfd_abs_section_ptr
;
5078 else if (isym
->st_shndx
== SHN_COMMON
)
5079 isec
= bfd_com_section_ptr
;
5088 /* Don't output the first, undefined, symbol. */
5089 if (esym
== external_syms
)
5092 /* If we are stripping all symbols, we don't want to output this
5094 if (finfo
->info
->strip
== strip_all
)
5097 /* We never output section symbols. Instead, we use the section
5098 symbol of the corresponding section in the output file. */
5099 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5102 /* If we are discarding all local symbols, we don't want to
5103 output this one. If we are generating a relocateable output
5104 file, then some of the local symbols may be required by
5105 relocs; we output them below as we discover that they are
5107 if (finfo
->info
->discard
== discard_all
)
5110 /* If this symbol is defined in a section which we are
5111 discarding, we don't need to keep it, but note that
5112 linker_mark is only reliable for sections that have contents.
5113 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5114 as well as linker_mark. */
5115 if (isym
->st_shndx
> 0
5116 && isym
->st_shndx
< SHN_LORESERVE
5118 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5119 || (! finfo
->info
->relocateable
5120 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5123 /* Get the name of the symbol. */
5124 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5129 /* See if we are discarding symbols with this name. */
5130 if ((finfo
->info
->strip
== strip_some
5131 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5133 || (finfo
->info
->discard
== discard_l
5134 && bfd_is_local_label_name (input_bfd
, name
)))
5137 /* If we get here, we are going to output this symbol. */
5141 /* Adjust the section index for the output file. */
5142 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5143 isec
->output_section
);
5144 if (osym
.st_shndx
== (unsigned short) -1)
5147 *pindex
= bfd_get_symcount (output_bfd
);
5149 /* ELF symbols in relocateable files are section relative, but
5150 in executable files they are virtual addresses. Note that
5151 this code assumes that all ELF sections have an associated
5152 BFD section with a reasonable value for output_offset; below
5153 we assume that they also have a reasonable value for
5154 output_section. Any special sections must be set up to meet
5155 these requirements. */
5156 osym
.st_value
+= isec
->output_offset
;
5157 if (! finfo
->info
->relocateable
)
5158 osym
.st_value
+= isec
->output_section
->vma
;
5160 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5164 /* Relocate the contents of each section. */
5165 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5169 if (! o
->linker_mark
)
5171 /* This section was omitted from the link. */
5175 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5176 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5179 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5181 /* Section was created by elf_link_create_dynamic_sections
5186 /* Get the contents of the section. They have been cached by a
5187 relaxation routine. Note that o is a section in an input
5188 file, so the contents field will not have been set by any of
5189 the routines which work on output files. */
5190 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5191 contents
= elf_section_data (o
)->this_hdr
.contents
;
5194 contents
= finfo
->contents
;
5195 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5196 (file_ptr
) 0, o
->_raw_size
))
5200 if ((o
->flags
& SEC_RELOC
) != 0)
5202 Elf_Internal_Rela
*internal_relocs
;
5204 /* Get the swapped relocs. */
5205 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5206 (input_bfd
, o
, finfo
->external_relocs
,
5207 finfo
->internal_relocs
, false));
5208 if (internal_relocs
== NULL
5209 && o
->reloc_count
> 0)
5212 /* Relocate the section by invoking a back end routine.
5214 The back end routine is responsible for adjusting the
5215 section contents as necessary, and (if using Rela relocs
5216 and generating a relocateable output file) adjusting the
5217 reloc addend as necessary.
5219 The back end routine does not have to worry about setting
5220 the reloc address or the reloc symbol index.
5222 The back end routine is given a pointer to the swapped in
5223 internal symbols, and can access the hash table entries
5224 for the external symbols via elf_sym_hashes (input_bfd).
5226 When generating relocateable output, the back end routine
5227 must handle STB_LOCAL/STT_SECTION symbols specially. The
5228 output symbol is going to be a section symbol
5229 corresponding to the output section, which will require
5230 the addend to be adjusted. */
5232 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5233 input_bfd
, o
, contents
,
5235 finfo
->internal_syms
,
5239 if (finfo
->info
->relocateable
)
5241 Elf_Internal_Rela
*irela
;
5242 Elf_Internal_Rela
*irelaend
;
5243 struct elf_link_hash_entry
**rel_hash
;
5244 Elf_Internal_Shdr
*input_rel_hdr
;
5246 /* Adjust the reloc addresses and symbol indices. */
5248 irela
= internal_relocs
;
5250 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5251 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5252 + elf_section_data (o
->output_section
)->rel_count
5253 + elf_section_data (o
->output_section
)->rel_count2
);
5254 for (; irela
< irelaend
; irela
++, rel_hash
++)
5256 unsigned long r_symndx
;
5257 Elf_Internal_Sym
*isym
;
5260 irela
->r_offset
+= o
->output_offset
;
5262 r_symndx
= ELF_R_SYM (irela
->r_info
);
5267 if (r_symndx
>= locsymcount
5268 || (elf_bad_symtab (input_bfd
)
5269 && finfo
->sections
[r_symndx
] == NULL
))
5271 struct elf_link_hash_entry
*rh
;
5274 /* This is a reloc against a global symbol. We
5275 have not yet output all the local symbols, so
5276 we do not know the symbol index of any global
5277 symbol. We set the rel_hash entry for this
5278 reloc to point to the global hash table entry
5279 for this symbol. The symbol index is then
5280 set at the end of elf_bfd_final_link. */
5281 indx
= r_symndx
- extsymoff
;
5282 rh
= elf_sym_hashes (input_bfd
)[indx
];
5283 while (rh
->root
.type
== bfd_link_hash_indirect
5284 || rh
->root
.type
== bfd_link_hash_warning
)
5285 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5287 /* Setting the index to -2 tells
5288 elf_link_output_extsym that this symbol is
5290 BFD_ASSERT (rh
->indx
< 0);
5298 /* This is a reloc against a local symbol. */
5301 isym
= finfo
->internal_syms
+ r_symndx
;
5302 sec
= finfo
->sections
[r_symndx
];
5303 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5305 /* I suppose the backend ought to fill in the
5306 section of any STT_SECTION symbol against a
5307 processor specific section. If we have
5308 discarded a section, the output_section will
5309 be the absolute section. */
5311 && (bfd_is_abs_section (sec
)
5312 || (sec
->output_section
!= NULL
5313 && bfd_is_abs_section (sec
->output_section
))))
5315 else if (sec
== NULL
|| sec
->owner
== NULL
)
5317 bfd_set_error (bfd_error_bad_value
);
5322 r_symndx
= sec
->output_section
->target_index
;
5323 BFD_ASSERT (r_symndx
!= 0);
5328 if (finfo
->indices
[r_symndx
] == -1)
5334 if (finfo
->info
->strip
== strip_all
)
5336 /* You can't do ld -r -s. */
5337 bfd_set_error (bfd_error_invalid_operation
);
5341 /* This symbol was skipped earlier, but
5342 since it is needed by a reloc, we
5343 must output it now. */
5344 link
= symtab_hdr
->sh_link
;
5345 name
= bfd_elf_string_from_elf_section (input_bfd
,
5351 osec
= sec
->output_section
;
5353 _bfd_elf_section_from_bfd_section (output_bfd
,
5355 if (isym
->st_shndx
== (unsigned short) -1)
5358 isym
->st_value
+= sec
->output_offset
;
5359 if (! finfo
->info
->relocateable
)
5360 isym
->st_value
+= osec
->vma
;
5362 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5364 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5368 r_symndx
= finfo
->indices
[r_symndx
];
5371 irela
->r_info
= ELF_R_INFO (r_symndx
,
5372 ELF_R_TYPE (irela
->r_info
));
5375 /* Swap out the relocs. */
5376 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5377 elf_link_output_relocs (output_bfd
, o
,
5381 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5382 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5384 elf_link_output_relocs (output_bfd
, o
,
5390 /* Write out the modified section contents. */
5391 if (elf_section_data (o
)->stab_info
== NULL
)
5393 if (! (o
->flags
& SEC_EXCLUDE
) &&
5394 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5395 contents
, o
->output_offset
,
5396 (o
->_cooked_size
!= 0
5403 if (! (_bfd_write_section_stabs
5404 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5405 o
, &elf_section_data (o
)->stab_info
, contents
)))
5413 /* Generate a reloc when linking an ELF file. This is a reloc
5414 requested by the linker, and does come from any input file. This
5415 is used to build constructor and destructor tables when linking
5419 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5421 struct bfd_link_info
*info
;
5422 asection
*output_section
;
5423 struct bfd_link_order
*link_order
;
5425 reloc_howto_type
*howto
;
5429 struct elf_link_hash_entry
**rel_hash_ptr
;
5430 Elf_Internal_Shdr
*rel_hdr
;
5432 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5435 bfd_set_error (bfd_error_bad_value
);
5439 addend
= link_order
->u
.reloc
.p
->addend
;
5441 /* Figure out the symbol index. */
5442 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5443 + elf_section_data (output_section
)->rel_count
5444 + elf_section_data (output_section
)->rel_count2
);
5445 if (link_order
->type
== bfd_section_reloc_link_order
)
5447 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5448 BFD_ASSERT (indx
!= 0);
5449 *rel_hash_ptr
= NULL
;
5453 struct elf_link_hash_entry
*h
;
5455 /* Treat a reloc against a defined symbol as though it were
5456 actually against the section. */
5457 h
= ((struct elf_link_hash_entry
*)
5458 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5459 link_order
->u
.reloc
.p
->u
.name
,
5460 false, false, true));
5462 && (h
->root
.type
== bfd_link_hash_defined
5463 || h
->root
.type
== bfd_link_hash_defweak
))
5467 section
= h
->root
.u
.def
.section
;
5468 indx
= section
->output_section
->target_index
;
5469 *rel_hash_ptr
= NULL
;
5470 /* It seems that we ought to add the symbol value to the
5471 addend here, but in practice it has already been added
5472 because it was passed to constructor_callback. */
5473 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5477 /* Setting the index to -2 tells elf_link_output_extsym that
5478 this symbol is used by a reloc. */
5485 if (! ((*info
->callbacks
->unattached_reloc
)
5486 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5487 (asection
*) NULL
, (bfd_vma
) 0)))
5493 /* If this is an inplace reloc, we must write the addend into the
5495 if (howto
->partial_inplace
&& addend
!= 0)
5498 bfd_reloc_status_type rstat
;
5502 size
= bfd_get_reloc_size (howto
);
5503 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5504 if (buf
== (bfd_byte
*) NULL
)
5506 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5512 case bfd_reloc_outofrange
:
5514 case bfd_reloc_overflow
:
5515 if (! ((*info
->callbacks
->reloc_overflow
)
5517 (link_order
->type
== bfd_section_reloc_link_order
5518 ? bfd_section_name (output_bfd
,
5519 link_order
->u
.reloc
.p
->u
.section
)
5520 : link_order
->u
.reloc
.p
->u
.name
),
5521 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5529 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5530 (file_ptr
) link_order
->offset
, size
);
5536 /* The address of a reloc is relative to the section in a
5537 relocateable file, and is a virtual address in an executable
5539 offset
= link_order
->offset
;
5540 if (! info
->relocateable
)
5541 offset
+= output_section
->vma
;
5543 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5545 if (rel_hdr
->sh_type
== SHT_REL
)
5547 Elf_Internal_Rel irel
;
5548 Elf_External_Rel
*erel
;
5550 irel
.r_offset
= offset
;
5551 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5552 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5553 + elf_section_data (output_section
)->rel_count
);
5554 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5558 Elf_Internal_Rela irela
;
5559 Elf_External_Rela
*erela
;
5561 irela
.r_offset
= offset
;
5562 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5563 irela
.r_addend
= addend
;
5564 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5565 + elf_section_data (output_section
)->rel_count
);
5566 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5569 ++elf_section_data (output_section
)->rel_count
;
5575 /* Allocate a pointer to live in a linker created section. */
5578 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5580 struct bfd_link_info
*info
;
5581 elf_linker_section_t
*lsect
;
5582 struct elf_link_hash_entry
*h
;
5583 const Elf_Internal_Rela
*rel
;
5585 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5586 elf_linker_section_pointers_t
*linker_section_ptr
;
5587 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5589 BFD_ASSERT (lsect
!= NULL
);
5591 /* Is this a global symbol? */
5594 /* Has this symbol already been allocated, if so, our work is done */
5595 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5600 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5601 /* Make sure this symbol is output as a dynamic symbol. */
5602 if (h
->dynindx
== -1)
5604 if (! elf_link_record_dynamic_symbol (info
, h
))
5608 if (lsect
->rel_section
)
5609 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5612 else /* Allocation of a pointer to a local symbol */
5614 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5616 /* Allocate a table to hold the local symbols if first time */
5619 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5620 register unsigned int i
;
5622 ptr
= (elf_linker_section_pointers_t
**)
5623 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5628 elf_local_ptr_offsets (abfd
) = ptr
;
5629 for (i
= 0; i
< num_symbols
; i
++)
5630 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5633 /* Has this symbol already been allocated, if so, our work is done */
5634 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5639 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5643 /* If we are generating a shared object, we need to
5644 output a R_<xxx>_RELATIVE reloc so that the
5645 dynamic linker can adjust this GOT entry. */
5646 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5647 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5651 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5652 from internal memory. */
5653 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5654 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5655 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5657 if (!linker_section_ptr
)
5660 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5661 linker_section_ptr
->addend
= rel
->r_addend
;
5662 linker_section_ptr
->which
= lsect
->which
;
5663 linker_section_ptr
->written_address_p
= false;
5664 *ptr_linker_section_ptr
= linker_section_ptr
;
5667 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5669 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5670 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5671 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5672 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5674 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5676 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5677 lsect
->sym_hash
->root
.root
.string
,
5678 (long)ARCH_SIZE
/ 8,
5679 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5685 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5687 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5690 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5691 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5699 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5702 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5705 /* Fill in the address for a pointer generated in alinker section. */
5708 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5711 struct bfd_link_info
*info
;
5712 elf_linker_section_t
*lsect
;
5713 struct elf_link_hash_entry
*h
;
5715 const Elf_Internal_Rela
*rel
;
5718 elf_linker_section_pointers_t
*linker_section_ptr
;
5720 BFD_ASSERT (lsect
!= NULL
);
5722 if (h
!= NULL
) /* global symbol */
5724 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5728 BFD_ASSERT (linker_section_ptr
!= NULL
);
5730 if (! elf_hash_table (info
)->dynamic_sections_created
5733 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5735 /* This is actually a static link, or it is a
5736 -Bsymbolic link and the symbol is defined
5737 locally. We must initialize this entry in the
5740 When doing a dynamic link, we create a .rela.<xxx>
5741 relocation entry to initialize the value. This
5742 is done in the finish_dynamic_symbol routine. */
5743 if (!linker_section_ptr
->written_address_p
)
5745 linker_section_ptr
->written_address_p
= true;
5746 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5747 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5751 else /* local symbol */
5753 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5754 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5755 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5756 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5760 BFD_ASSERT (linker_section_ptr
!= NULL
);
5762 /* Write out pointer if it hasn't been rewritten out before */
5763 if (!linker_section_ptr
->written_address_p
)
5765 linker_section_ptr
->written_address_p
= true;
5766 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5767 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5771 asection
*srel
= lsect
->rel_section
;
5772 Elf_Internal_Rela outrel
;
5774 /* We need to generate a relative reloc for the dynamic linker. */
5776 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5779 BFD_ASSERT (srel
!= NULL
);
5781 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5782 + lsect
->section
->output_offset
5783 + linker_section_ptr
->offset
);
5784 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5785 outrel
.r_addend
= 0;
5786 elf_swap_reloca_out (output_bfd
, &outrel
,
5787 (((Elf_External_Rela
*)
5788 lsect
->section
->contents
)
5789 + elf_section_data (lsect
->section
)->rel_count
));
5790 ++elf_section_data (lsect
->section
)->rel_count
;
5795 relocation
= (lsect
->section
->output_offset
5796 + linker_section_ptr
->offset
5797 - lsect
->hole_offset
5798 - lsect
->sym_offset
);
5801 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5802 lsect
->name
, (long)relocation
, (long)relocation
);
5805 /* Subtract out the addend, because it will get added back in by the normal
5807 return relocation
- linker_section_ptr
->addend
;
5810 /* Garbage collect unused sections. */
5812 static boolean elf_gc_mark
5813 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5814 asection
* (*gc_mark_hook
)
5815 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5816 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5818 static boolean elf_gc_sweep
5819 PARAMS ((struct bfd_link_info
*info
,
5820 boolean (*gc_sweep_hook
)
5821 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5822 const Elf_Internal_Rela
*relocs
))));
5824 static boolean elf_gc_sweep_symbol
5825 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5827 static boolean elf_gc_allocate_got_offsets
5828 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5830 static boolean elf_gc_propagate_vtable_entries_used
5831 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5833 static boolean elf_gc_smash_unused_vtentry_relocs
5834 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5836 /* The mark phase of garbage collection. For a given section, mark
5837 it, and all the sections which define symbols to which it refers. */
5840 elf_gc_mark (info
, sec
, gc_mark_hook
)
5841 struct bfd_link_info
*info
;
5843 asection
* (*gc_mark_hook
)
5844 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5845 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5851 /* Look through the section relocs. */
5853 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5855 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5856 Elf_Internal_Shdr
*symtab_hdr
;
5857 struct elf_link_hash_entry
**sym_hashes
;
5860 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5861 bfd
*input_bfd
= sec
->owner
;
5862 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
5864 /* GCFIXME: how to arrange so that relocs and symbols are not
5865 reread continually? */
5867 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5868 sym_hashes
= elf_sym_hashes (input_bfd
);
5870 /* Read the local symbols. */
5871 if (elf_bad_symtab (input_bfd
))
5873 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5877 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5878 if (symtab_hdr
->contents
)
5879 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5880 else if (nlocsyms
== 0)
5884 locsyms
= freesyms
=
5885 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5886 if (freesyms
== NULL
5887 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5888 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5889 nlocsyms
, input_bfd
)
5890 != nlocsyms
* sizeof (Elf_External_Sym
)))
5897 /* Read the relocations. */
5898 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5899 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5900 info
->keep_memory
));
5901 if (relstart
== NULL
)
5906 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5908 for (rel
= relstart
; rel
< relend
; rel
++)
5910 unsigned long r_symndx
;
5912 struct elf_link_hash_entry
*h
;
5915 r_symndx
= ELF_R_SYM (rel
->r_info
);
5919 if (elf_bad_symtab (sec
->owner
))
5921 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5922 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5923 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5926 h
= sym_hashes
[r_symndx
- extsymoff
];
5927 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5930 else if (r_symndx
>= nlocsyms
)
5932 h
= sym_hashes
[r_symndx
- extsymoff
];
5933 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5937 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5938 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5941 if (rsec
&& !rsec
->gc_mark
)
5942 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
5950 if (!info
->keep_memory
)
5960 /* The sweep phase of garbage collection. Remove all garbage sections. */
5963 elf_gc_sweep (info
, gc_sweep_hook
)
5964 struct bfd_link_info
*info
;
5965 boolean (*gc_sweep_hook
)
5966 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5967 const Elf_Internal_Rela
*relocs
));
5971 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5975 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5977 /* Keep special sections. Keep .debug sections. */
5978 if ((o
->flags
& SEC_LINKER_CREATED
)
5979 || (o
->flags
& SEC_DEBUGGING
))
5985 /* Skip sweeping sections already excluded. */
5986 if (o
->flags
& SEC_EXCLUDE
)
5989 /* Since this is early in the link process, it is simple
5990 to remove a section from the output. */
5991 o
->flags
|= SEC_EXCLUDE
;
5993 /* But we also have to update some of the relocation
5994 info we collected before. */
5996 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
5998 Elf_Internal_Rela
*internal_relocs
;
6001 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6002 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6003 if (internal_relocs
== NULL
)
6006 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6008 if (!info
->keep_memory
)
6009 free (internal_relocs
);
6017 /* Remove the symbols that were in the swept sections from the dynamic
6018 symbol table. GCFIXME: Anyone know how to get them out of the
6019 static symbol table as well? */
6023 elf_link_hash_traverse (elf_hash_table (info
),
6024 elf_gc_sweep_symbol
,
6027 elf_hash_table (info
)->dynsymcount
= i
;
6033 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6036 elf_gc_sweep_symbol (h
, idxptr
)
6037 struct elf_link_hash_entry
*h
;
6040 int *idx
= (int *) idxptr
;
6042 if (h
->dynindx
!= -1
6043 && ((h
->root
.type
!= bfd_link_hash_defined
6044 && h
->root
.type
!= bfd_link_hash_defweak
)
6045 || h
->root
.u
.def
.section
->gc_mark
))
6046 h
->dynindx
= (*idx
)++;
6051 /* Propogate collected vtable information. This is called through
6052 elf_link_hash_traverse. */
6055 elf_gc_propagate_vtable_entries_used (h
, okp
)
6056 struct elf_link_hash_entry
*h
;
6059 /* Those that are not vtables. */
6060 if (h
->vtable_parent
== NULL
)
6063 /* Those vtables that do not have parents, we cannot merge. */
6064 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6067 /* If we've already been done, exit. */
6068 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6071 /* Make sure the parent's table is up to date. */
6072 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6074 if (h
->vtable_entries_used
== NULL
)
6076 /* None of this table's entries were referenced. Re-use the
6078 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6079 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6086 /* Or the parent's entries into ours. */
6087 cu
= h
->vtable_entries_used
;
6089 pu
= h
->vtable_parent
->vtable_entries_used
;
6092 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6095 if (*pu
) *cu
= true;
6105 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6106 struct elf_link_hash_entry
*h
;
6110 bfd_vma hstart
, hend
;
6111 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6112 struct elf_backend_data
*bed
;
6114 /* Take care of both those symbols that do not describe vtables as
6115 well as those that are not loaded. */
6116 if (h
->vtable_parent
== NULL
)
6119 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6120 || h
->root
.type
== bfd_link_hash_defweak
);
6122 sec
= h
->root
.u
.def
.section
;
6123 hstart
= h
->root
.u
.def
.value
;
6124 hend
= hstart
+ h
->size
;
6126 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6127 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6129 return *(boolean
*)okp
= false;
6130 bed
= get_elf_backend_data (sec
->owner
);
6131 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6133 for (rel
= relstart
; rel
< relend
; ++rel
)
6134 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6136 /* If the entry is in use, do nothing. */
6137 if (h
->vtable_entries_used
6138 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6140 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6141 if (h
->vtable_entries_used
[entry
])
6144 /* Otherwise, kill it. */
6145 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6151 /* Do mark and sweep of unused sections. */
6154 elf_gc_sections (abfd
, info
)
6156 struct bfd_link_info
*info
;
6160 asection
* (*gc_mark_hook
)
6161 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6162 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6164 if (!get_elf_backend_data (abfd
)->can_gc_sections
6165 || info
->relocateable
6166 || elf_hash_table (info
)->dynamic_sections_created
)
6169 /* Apply transitive closure to the vtable entry usage info. */
6170 elf_link_hash_traverse (elf_hash_table (info
),
6171 elf_gc_propagate_vtable_entries_used
,
6176 /* Kill the vtable relocations that were not used. */
6177 elf_link_hash_traverse (elf_hash_table (info
),
6178 elf_gc_smash_unused_vtentry_relocs
,
6183 /* Grovel through relocs to find out who stays ... */
6185 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6186 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6189 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6191 if (o
->flags
& SEC_KEEP
)
6192 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6197 /* ... and mark SEC_EXCLUDE for those that go. */
6198 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6204 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6207 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6210 struct elf_link_hash_entry
*h
;
6213 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6214 struct elf_link_hash_entry
**search
, *child
;
6215 bfd_size_type extsymcount
;
6217 /* The sh_info field of the symtab header tells us where the
6218 external symbols start. We don't care about the local symbols at
6220 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6221 if (!elf_bad_symtab (abfd
))
6222 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6224 sym_hashes
= elf_sym_hashes (abfd
);
6225 sym_hashes_end
= sym_hashes
+ extsymcount
;
6227 /* Hunt down the child symbol, which is in this section at the same
6228 offset as the relocation. */
6229 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6231 if ((child
= *search
) != NULL
6232 && (child
->root
.type
== bfd_link_hash_defined
6233 || child
->root
.type
== bfd_link_hash_defweak
)
6234 && child
->root
.u
.def
.section
== sec
6235 && child
->root
.u
.def
.value
== offset
)
6239 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6240 bfd_get_filename (abfd
), sec
->name
,
6241 (unsigned long)offset
);
6242 bfd_set_error (bfd_error_invalid_operation
);
6248 /* This *should* only be the absolute section. It could potentially
6249 be that someone has defined a non-global vtable though, which
6250 would be bad. It isn't worth paging in the local symbols to be
6251 sure though; that case should simply be handled by the assembler. */
6253 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6256 child
->vtable_parent
= h
;
6261 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6264 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6265 bfd
*abfd ATTRIBUTE_UNUSED
;
6266 asection
*sec ATTRIBUTE_UNUSED
;
6267 struct elf_link_hash_entry
*h
;
6270 if (addend
>= h
->vtable_entries_size
)
6273 boolean
*ptr
= h
->vtable_entries_used
;
6275 /* While the symbol is undefined, we have to be prepared to handle
6277 if (h
->root
.type
== bfd_link_hash_undefined
)
6284 /* Oops! We've got a reference past the defined end of
6285 the table. This is probably a bug -- shall we warn? */
6290 /* Allocate one extra entry for use as a "done" flag for the
6291 consolidation pass. */
6292 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
6298 ptr
= realloc (ptr
-1, bytes
);
6302 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof(boolean
);
6303 memset (ptr
+ oldbytes
, 0, bytes
- oldbytes
);
6307 ptr
= calloc (1, bytes
);
6312 /* And arrange for that done flag to be at index -1. */
6313 h
->vtable_entries_used
= ptr
+1;
6314 h
->vtable_entries_size
= size
;
6316 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6321 /* And an accompanying bit to work out final got entry offsets once
6322 we're done. Should be called from final_link. */
6325 elf_gc_common_finalize_got_offsets (abfd
, info
)
6327 struct bfd_link_info
*info
;
6330 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6333 /* The GOT offset is relative to the .got section, but the GOT header is
6334 put into the .got.plt section, if the backend uses it. */
6335 if (bed
->want_got_plt
)
6338 gotoff
= bed
->got_header_size
;
6340 /* Do the local .got entries first. */
6341 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6343 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
6344 bfd_size_type j
, locsymcount
;
6345 Elf_Internal_Shdr
*symtab_hdr
;
6350 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6351 if (elf_bad_symtab (i
))
6352 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6354 locsymcount
= symtab_hdr
->sh_info
;
6356 for (j
= 0; j
< locsymcount
; ++j
)
6358 if (local_got
[j
] > 0)
6360 local_got
[j
] = gotoff
;
6361 gotoff
+= ARCH_SIZE
/ 8;
6364 local_got
[j
] = (bfd_vma
) -1;
6368 /* Then the global .got and .plt entries. */
6369 elf_link_hash_traverse (elf_hash_table (info
),
6370 elf_gc_allocate_got_offsets
,
6375 /* We need a special top-level link routine to convert got reference counts
6376 to real got offsets. */
6379 elf_gc_allocate_got_offsets (h
, offarg
)
6380 struct elf_link_hash_entry
*h
;
6383 bfd_vma
*off
= (bfd_vma
*) offarg
;
6385 if (h
->got
.refcount
> 0)
6387 h
->got
.offset
= off
[0];
6388 off
[0] += ARCH_SIZE
/ 8;
6391 h
->got
.offset
= (bfd_vma
) -1;
6396 /* Many folk need no more in the way of final link than this, once
6397 got entry reference counting is enabled. */
6400 elf_gc_common_final_link (abfd
, info
)
6402 struct bfd_link_info
*info
;
6404 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6407 /* Invoke the regular ELF backend linker to do all the work. */
6408 return elf_bfd_final_link (abfd
, info
);
6411 /* This function will be called though elf_link_hash_traverse to store
6412 all hash value of the exported symbols in an array. */
6415 elf_collect_hash_codes (h
, data
)
6416 struct elf_link_hash_entry
*h
;
6419 unsigned long **valuep
= (unsigned long **) data
;
6425 /* Ignore indirect symbols. These are added by the versioning code. */
6426 if (h
->dynindx
== -1)
6429 name
= h
->root
.root
.string
;
6430 p
= strchr (name
, ELF_VER_CHR
);
6433 alc
= bfd_malloc (p
- name
+ 1);
6434 memcpy (alc
, name
, p
- name
);
6435 alc
[p
- name
] = '\0';
6439 /* Compute the hash value. */
6440 ha
= bfd_elf_hash (name
);
6442 /* Store the found hash value in the array given as the argument. */
6445 /* And store it in the struct so that we can put it in the hash table
6447 h
->elf_hash_value
= ha
;