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
375 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
376 respectively, is from a dynamic object. */
378 if ((abfd
->flags
& DYNAMIC
) != 0)
383 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
388 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
389 respectively, appear to be a definition rather than reference. */
391 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
396 if (h
->root
.type
== bfd_link_hash_undefined
397 || h
->root
.type
== bfd_link_hash_undefweak
398 || h
->root
.type
== bfd_link_hash_common
)
403 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
404 symbol, respectively, appears to be a common symbol in a dynamic
405 object. If a symbol appears in an uninitialized section, and is
406 not weak, and is not a function, then it may be a common symbol
407 which was resolved when the dynamic object was created. We want
408 to treat such symbols specially, because they raise special
409 considerations when setting the symbol size: if the symbol
410 appears as a common symbol in a regular object, and the size in
411 the regular object is larger, we must make sure that we use the
412 larger size. This problematic case can always be avoided in C,
413 but it must be handled correctly when using Fortran shared
416 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
417 likewise for OLDDYNCOMMON and OLDDEF.
419 Note that this test is just a heuristic, and that it is quite
420 possible to have an uninitialized symbol in a shared object which
421 is really a definition, rather than a common symbol. This could
422 lead to some minor confusion when the symbol really is a common
423 symbol in some regular object. However, I think it will be
428 && (sec
->flags
& SEC_ALLOC
) != 0
429 && (sec
->flags
& SEC_LOAD
) == 0
432 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
435 newdyncommon
= false;
439 && h
->root
.type
== bfd_link_hash_defined
440 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
441 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
442 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
444 && h
->type
!= STT_FUNC
)
447 olddyncommon
= false;
449 /* It's OK to change the type if either the existing symbol or the
450 new symbol is weak. */
452 if (h
->root
.type
== bfd_link_hash_defweak
453 || h
->root
.type
== bfd_link_hash_undefweak
455 *type_change_ok
= true;
457 /* It's OK to change the size if either the existing symbol or the
458 new symbol is weak, or if the old symbol is undefined. */
461 || h
->root
.type
== bfd_link_hash_undefined
)
462 *size_change_ok
= true;
464 /* If both the old and the new symbols look like common symbols in a
465 dynamic object, set the size of the symbol to the larger of the
470 && sym
->st_size
!= h
->size
)
472 /* Since we think we have two common symbols, issue a multiple
473 common warning if desired. Note that we only warn if the
474 size is different. If the size is the same, we simply let
475 the old symbol override the new one as normally happens with
476 symbols defined in dynamic objects. */
478 if (! ((*info
->callbacks
->multiple_common
)
479 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
480 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
483 if (sym
->st_size
> h
->size
)
484 h
->size
= sym
->st_size
;
486 *size_change_ok
= true;
489 /* If we are looking at a dynamic object, and we have found a
490 definition, we need to see if the symbol was already defined by
491 some other object. If so, we want to use the existing
492 definition, and we do not want to report a multiple symbol
493 definition error; we do this by clobbering *PSEC to be
496 We treat a common symbol as a definition if the symbol in the
497 shared library is a function, since common symbols always
498 represent variables; this can cause confusion in principle, but
499 any such confusion would seem to indicate an erroneous program or
500 shared library. We also permit a common symbol in a regular
501 object to override a weak symbol in a shared object.
503 We prefer a non-weak definition in a shared library to a weak
504 definition in the executable. */
509 || (h
->root
.type
== bfd_link_hash_common
511 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
512 && (h
->root
.type
!= bfd_link_hash_defweak
513 || bind
== STB_WEAK
))
517 newdyncommon
= false;
519 *psec
= sec
= bfd_und_section_ptr
;
520 *size_change_ok
= true;
522 /* If we get here when the old symbol is a common symbol, then
523 we are explicitly letting it override a weak symbol or
524 function in a dynamic object, and we don't want to warn about
525 a type change. If the old symbol is a defined symbol, a type
526 change warning may still be appropriate. */
528 if (h
->root
.type
== bfd_link_hash_common
)
529 *type_change_ok
= true;
532 /* Handle the special case of an old common symbol merging with a
533 new symbol which looks like a common symbol in a shared object.
534 We change *PSEC and *PVALUE to make the new symbol look like a
535 common symbol, and let _bfd_generic_link_add_one_symbol will do
539 && h
->root
.type
== bfd_link_hash_common
)
543 newdyncommon
= false;
544 *pvalue
= sym
->st_size
;
545 *psec
= sec
= bfd_com_section_ptr
;
546 *size_change_ok
= true;
549 /* If the old symbol is from a dynamic object, and the new symbol is
550 a definition which is not from a dynamic object, then the new
551 symbol overrides the old symbol. Symbols from regular files
552 always take precedence over symbols from dynamic objects, even if
553 they are defined after the dynamic object in the link.
555 As above, we again permit a common symbol in a regular object to
556 override a definition in a shared object if the shared object
557 symbol is a function or is weak.
559 As above, we permit a non-weak definition in a shared object to
560 override a weak definition in a regular object. */
564 || (bfd_is_com_section (sec
)
565 && (h
->root
.type
== bfd_link_hash_defweak
566 || h
->type
== STT_FUNC
)))
569 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
571 || h
->root
.type
== bfd_link_hash_defweak
))
573 /* Change the hash table entry to undefined, and let
574 _bfd_generic_link_add_one_symbol do the right thing with the
577 h
->root
.type
= bfd_link_hash_undefined
;
578 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
579 *size_change_ok
= true;
582 olddyncommon
= false;
584 /* We again permit a type change when a common symbol may be
585 overriding a function. */
587 if (bfd_is_com_section (sec
))
588 *type_change_ok
= true;
590 /* This union may have been set to be non-NULL when this symbol
591 was seen in a dynamic object. We must force the union to be
592 NULL, so that it is correct for a regular symbol. */
594 h
->verinfo
.vertree
= NULL
;
596 /* In this special case, if H is the target of an indirection,
597 we want the caller to frob with H rather than with the
598 indirect symbol. That will permit the caller to redefine the
599 target of the indirection, rather than the indirect symbol
600 itself. FIXME: This will break the -y option if we store a
601 symbol with a different name. */
605 /* Handle the special case of a new common symbol merging with an
606 old symbol that looks like it might be a common symbol defined in
607 a shared object. Note that we have already handled the case in
608 which a new common symbol should simply override the definition
609 in the shared library. */
612 && bfd_is_com_section (sec
)
615 /* It would be best if we could set the hash table entry to a
616 common symbol, but we don't know what to use for the section
618 if (! ((*info
->callbacks
->multiple_common
)
619 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
620 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
623 /* If the predumed common symbol in the dynamic object is
624 larger, pretend that the new symbol has its size. */
626 if (h
->size
> *pvalue
)
629 /* FIXME: We no longer know the alignment required by the symbol
630 in the dynamic object, so we just wind up using the one from
631 the regular object. */
634 olddyncommon
= false;
636 h
->root
.type
= bfd_link_hash_undefined
;
637 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
639 *size_change_ok
= true;
640 *type_change_ok
= true;
642 h
->verinfo
.vertree
= NULL
;
645 /* Handle the special case of a weak definition in a regular object
646 followed by a non-weak definition in a shared object. In this
647 case, we prefer the definition in the shared object. */
649 && h
->root
.type
== bfd_link_hash_defweak
654 /* To make this work we have to frob the flags so that the rest
655 of the code does not think we are using the regular
657 h
->elf_link_hash_flags
&= ~ ELF_LINK_HASH_DEF_REGULAR
;
658 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
660 /* If H is the target of an indirection, we want the caller to
661 use H rather than the indirect symbol. Otherwise if we are
662 defining a new indirect symbol we will wind up attaching it
663 to the entry we are overriding. */
667 /* Handle the special case of a non-weak definition in a shared
668 object followed by a weak definition in a regular object. In
669 this case we prefer to definition in the shared object. To make
670 this work we have to tell the caller to not treat the new symbol
674 && h
->root
.type
!= bfd_link_hash_defweak
683 /* Add symbols from an ELF object file to the linker hash table. */
686 elf_link_add_object_symbols (abfd
, info
)
688 struct bfd_link_info
*info
;
690 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
691 const Elf_Internal_Sym
*,
692 const char **, flagword
*,
693 asection
**, bfd_vma
*));
694 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
695 asection
*, const Elf_Internal_Rela
*));
697 Elf_Internal_Shdr
*hdr
;
701 Elf_External_Sym
*buf
= NULL
;
702 struct elf_link_hash_entry
**sym_hash
;
704 bfd_byte
*dynver
= NULL
;
705 Elf_External_Versym
*extversym
= NULL
;
706 Elf_External_Versym
*ever
;
707 Elf_External_Dyn
*dynbuf
= NULL
;
708 struct elf_link_hash_entry
*weaks
;
709 Elf_External_Sym
*esym
;
710 Elf_External_Sym
*esymend
;
712 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
713 collect
= get_elf_backend_data (abfd
)->collect
;
715 if ((abfd
->flags
& DYNAMIC
) == 0)
721 /* You can't use -r against a dynamic object. Also, there's no
722 hope of using a dynamic object which does not exactly match
723 the format of the output file. */
724 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
726 bfd_set_error (bfd_error_invalid_operation
);
731 /* As a GNU extension, any input sections which are named
732 .gnu.warning.SYMBOL are treated as warning symbols for the given
733 symbol. This differs from .gnu.warning sections, which generate
734 warnings when they are included in an output file. */
739 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
743 name
= bfd_get_section_name (abfd
, s
);
744 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
749 name
+= sizeof ".gnu.warning." - 1;
751 /* If this is a shared object, then look up the symbol
752 in the hash table. If it is there, and it is already
753 been defined, then we will not be using the entry
754 from this shared object, so we don't need to warn.
755 FIXME: If we see the definition in a regular object
756 later on, we will warn, but we shouldn't. The only
757 fix is to keep track of what warnings we are supposed
758 to emit, and then handle them all at the end of the
760 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
762 struct elf_link_hash_entry
*h
;
764 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
767 /* FIXME: What about bfd_link_hash_common? */
769 && (h
->root
.type
== bfd_link_hash_defined
770 || h
->root
.type
== bfd_link_hash_defweak
))
772 /* We don't want to issue this warning. Clobber
773 the section size so that the warning does not
774 get copied into the output file. */
780 sz
= bfd_section_size (abfd
, s
);
781 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
785 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
790 if (! (_bfd_generic_link_add_one_symbol
791 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
792 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
795 if (! info
->relocateable
)
797 /* Clobber the section size so that the warning does
798 not get copied into the output file. */
805 /* If this is a dynamic object, we always link against the .dynsym
806 symbol table, not the .symtab symbol table. The dynamic linker
807 will only see the .dynsym symbol table, so there is no reason to
808 look at .symtab for a dynamic object. */
810 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
811 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
813 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
817 /* Read in any version definitions. */
819 if (! _bfd_elf_slurp_version_tables (abfd
))
822 /* Read in the symbol versions, but don't bother to convert them
823 to internal format. */
824 if (elf_dynversym (abfd
) != 0)
826 Elf_Internal_Shdr
*versymhdr
;
828 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
829 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
830 if (extversym
== NULL
)
832 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
833 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
834 != versymhdr
->sh_size
))
839 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
841 /* The sh_info field of the symtab header tells us where the
842 external symbols start. We don't care about the local symbols at
844 if (elf_bad_symtab (abfd
))
846 extsymcount
= symcount
;
851 extsymcount
= symcount
- hdr
->sh_info
;
852 extsymoff
= hdr
->sh_info
;
855 buf
= ((Elf_External_Sym
*)
856 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
857 if (buf
== NULL
&& extsymcount
!= 0)
860 /* We store a pointer to the hash table entry for each external
862 sym_hash
= ((struct elf_link_hash_entry
**)
864 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
865 if (sym_hash
== NULL
)
867 elf_sym_hashes (abfd
) = sym_hash
;
871 /* If we are creating a shared library, create all the dynamic
872 sections immediately. We need to attach them to something,
873 so we attach them to this BFD, provided it is the right
874 format. FIXME: If there are no input BFD's of the same
875 format as the output, we can't make a shared library. */
877 && ! elf_hash_table (info
)->dynamic_sections_created
878 && abfd
->xvec
== info
->hash
->creator
)
880 if (! elf_link_create_dynamic_sections (abfd
, info
))
889 bfd_size_type oldsize
;
890 bfd_size_type strindex
;
892 /* Find the name to use in a DT_NEEDED entry that refers to this
893 object. If the object has a DT_SONAME entry, we use it.
894 Otherwise, if the generic linker stuck something in
895 elf_dt_name, we use that. Otherwise, we just use the file
896 name. If the generic linker put a null string into
897 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
898 there is a DT_SONAME entry. */
900 name
= bfd_get_filename (abfd
);
901 if (elf_dt_name (abfd
) != NULL
)
903 name
= elf_dt_name (abfd
);
907 s
= bfd_get_section_by_name (abfd
, ".dynamic");
910 Elf_External_Dyn
*extdyn
;
911 Elf_External_Dyn
*extdynend
;
915 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
919 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
920 (file_ptr
) 0, s
->_raw_size
))
923 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
926 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
929 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
930 for (; extdyn
< extdynend
; extdyn
++)
932 Elf_Internal_Dyn dyn
;
934 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
935 if (dyn
.d_tag
== DT_SONAME
)
937 name
= bfd_elf_string_from_elf_section (abfd
, link
,
942 if (dyn
.d_tag
== DT_NEEDED
)
944 struct bfd_link_needed_list
*n
, **pn
;
947 n
= ((struct bfd_link_needed_list
*)
948 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
949 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
951 if (n
== NULL
|| fnm
== NULL
)
953 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
960 for (pn
= &elf_hash_table (info
)->needed
;
972 /* We do not want to include any of the sections in a dynamic
973 object in the output file. We hack by simply clobbering the
974 list of sections in the BFD. This could be handled more
975 cleanly by, say, a new section flag; the existing
976 SEC_NEVER_LOAD flag is not the one we want, because that one
977 still implies that the section takes up space in the output
979 abfd
->sections
= NULL
;
980 abfd
->section_count
= 0;
982 /* If this is the first dynamic object found in the link, create
983 the special sections required for dynamic linking. */
984 if (! elf_hash_table (info
)->dynamic_sections_created
)
986 if (! elf_link_create_dynamic_sections (abfd
, info
))
992 /* Add a DT_NEEDED entry for this dynamic object. */
993 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
994 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
996 if (strindex
== (bfd_size_type
) -1)
999 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1002 Elf_External_Dyn
*dyncon
, *dynconend
;
1004 /* The hash table size did not change, which means that
1005 the dynamic object name was already entered. If we
1006 have already included this dynamic object in the
1007 link, just ignore it. There is no reason to include
1008 a particular dynamic object more than once. */
1009 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1011 BFD_ASSERT (sdyn
!= NULL
);
1013 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1014 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1016 for (; dyncon
< dynconend
; dyncon
++)
1018 Elf_Internal_Dyn dyn
;
1020 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1022 if (dyn
.d_tag
== DT_NEEDED
1023 && dyn
.d_un
.d_val
== strindex
)
1027 if (extversym
!= NULL
)
1034 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1038 /* Save the SONAME, if there is one, because sometimes the
1039 linker emulation code will need to know it. */
1041 name
= bfd_get_filename (abfd
);
1042 elf_dt_name (abfd
) = name
;
1046 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1048 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1049 != extsymcount
* sizeof (Elf_External_Sym
)))
1054 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1055 esymend
= buf
+ extsymcount
;
1058 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1060 Elf_Internal_Sym sym
;
1066 struct elf_link_hash_entry
*h
;
1068 boolean size_change_ok
, type_change_ok
;
1069 boolean new_weakdef
;
1070 unsigned int old_alignment
;
1072 elf_swap_symbol_in (abfd
, esym
, &sym
);
1074 flags
= BSF_NO_FLAGS
;
1076 value
= sym
.st_value
;
1079 bind
= ELF_ST_BIND (sym
.st_info
);
1080 if (bind
== STB_LOCAL
)
1082 /* This should be impossible, since ELF requires that all
1083 global symbols follow all local symbols, and that sh_info
1084 point to the first global symbol. Unfortunatealy, Irix 5
1088 else if (bind
== STB_GLOBAL
)
1090 if (sym
.st_shndx
!= SHN_UNDEF
1091 && sym
.st_shndx
!= SHN_COMMON
)
1096 else if (bind
== STB_WEAK
)
1100 /* Leave it up to the processor backend. */
1103 if (sym
.st_shndx
== SHN_UNDEF
)
1104 sec
= bfd_und_section_ptr
;
1105 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1107 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1109 sec
= bfd_abs_section_ptr
;
1110 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1113 else if (sym
.st_shndx
== SHN_ABS
)
1114 sec
= bfd_abs_section_ptr
;
1115 else if (sym
.st_shndx
== SHN_COMMON
)
1117 sec
= bfd_com_section_ptr
;
1118 /* What ELF calls the size we call the value. What ELF
1119 calls the value we call the alignment. */
1120 value
= sym
.st_size
;
1124 /* Leave it up to the processor backend. */
1127 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1128 if (name
== (const char *) NULL
)
1131 if (add_symbol_hook
)
1133 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1137 /* The hook function sets the name to NULL if this symbol
1138 should be skipped for some reason. */
1139 if (name
== (const char *) NULL
)
1143 /* Sanity check that all possibilities were handled. */
1144 if (sec
== (asection
*) NULL
)
1146 bfd_set_error (bfd_error_bad_value
);
1150 if (bfd_is_und_section (sec
)
1151 || bfd_is_com_section (sec
))
1156 size_change_ok
= false;
1157 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1159 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1161 Elf_Internal_Versym iver
;
1162 unsigned int vernum
= 0;
1167 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1168 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1170 /* If this is a hidden symbol, or if it is not version
1171 1, we append the version name to the symbol name.
1172 However, we do not modify a non-hidden absolute
1173 symbol, because it might be the version symbol
1174 itself. FIXME: What if it isn't? */
1175 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1176 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1179 int namelen
, newlen
;
1182 if (sym
.st_shndx
!= SHN_UNDEF
)
1184 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1186 (*_bfd_error_handler
)
1187 (_("%s: %s: invalid version %u (max %d)"),
1188 bfd_get_filename (abfd
), name
, vernum
,
1189 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1190 bfd_set_error (bfd_error_bad_value
);
1193 else if (vernum
> 1)
1195 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1201 /* We cannot simply test for the number of
1202 entries in the VERNEED section since the
1203 numbers for the needed versions do not start
1205 Elf_Internal_Verneed
*t
;
1208 for (t
= elf_tdata (abfd
)->verref
;
1212 Elf_Internal_Vernaux
*a
;
1214 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1216 if (a
->vna_other
== vernum
)
1218 verstr
= a
->vna_nodename
;
1227 (*_bfd_error_handler
)
1228 (_("%s: %s: invalid needed version %d"),
1229 bfd_get_filename (abfd
), name
, vernum
);
1230 bfd_set_error (bfd_error_bad_value
);
1235 namelen
= strlen (name
);
1236 newlen
= namelen
+ strlen (verstr
) + 2;
1237 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1240 newname
= (char *) bfd_alloc (abfd
, newlen
);
1241 if (newname
== NULL
)
1243 strcpy (newname
, name
);
1244 p
= newname
+ namelen
;
1246 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1254 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1255 sym_hash
, &override
, &type_change_ok
,
1263 while (h
->root
.type
== bfd_link_hash_indirect
1264 || h
->root
.type
== bfd_link_hash_warning
)
1265 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1267 /* Remember the old alignment if this is a common symbol, so
1268 that we don't reduce the alignment later on. We can't
1269 check later, because _bfd_generic_link_add_one_symbol
1270 will set a default for the alignment which we want to
1272 if (h
->root
.type
== bfd_link_hash_common
)
1273 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1275 if (elf_tdata (abfd
)->verdef
!= NULL
1279 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1282 if (! (_bfd_generic_link_add_one_symbol
1283 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1284 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1288 while (h
->root
.type
== bfd_link_hash_indirect
1289 || h
->root
.type
== bfd_link_hash_warning
)
1290 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1293 new_weakdef
= false;
1296 && (flags
& BSF_WEAK
) != 0
1297 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1298 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1299 && h
->weakdef
== NULL
)
1301 /* Keep a list of all weak defined non function symbols from
1302 a dynamic object, using the weakdef field. Later in this
1303 function we will set the weakdef field to the correct
1304 value. We only put non-function symbols from dynamic
1305 objects on this list, because that happens to be the only
1306 time we need to know the normal symbol corresponding to a
1307 weak symbol, and the information is time consuming to
1308 figure out. If the weakdef field is not already NULL,
1309 then this symbol was already defined by some previous
1310 dynamic object, and we will be using that previous
1311 definition anyhow. */
1318 /* Set the alignment of a common symbol. */
1319 if (sym
.st_shndx
== SHN_COMMON
1320 && h
->root
.type
== bfd_link_hash_common
)
1324 align
= bfd_log2 (sym
.st_value
);
1325 if (align
> old_alignment
)
1326 h
->root
.u
.c
.p
->alignment_power
= align
;
1329 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1335 /* Remember the symbol size and type. */
1336 if (sym
.st_size
!= 0
1337 && (definition
|| h
->size
== 0))
1339 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1340 (*_bfd_error_handler
)
1341 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1342 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1343 bfd_get_filename (abfd
));
1345 h
->size
= sym
.st_size
;
1348 /* If this is a common symbol, then we always want H->SIZE
1349 to be the size of the common symbol. The code just above
1350 won't fix the size if a common symbol becomes larger. We
1351 don't warn about a size change here, because that is
1352 covered by --warn-common. */
1353 if (h
->root
.type
== bfd_link_hash_common
)
1354 h
->size
= h
->root
.u
.c
.size
;
1356 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1357 && (definition
|| h
->type
== STT_NOTYPE
))
1359 if (h
->type
!= STT_NOTYPE
1360 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1361 && ! type_change_ok
)
1362 (*_bfd_error_handler
)
1363 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1364 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1365 bfd_get_filename (abfd
));
1367 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1370 if (sym
.st_other
!= 0
1371 && (definition
|| h
->other
== 0))
1372 h
->other
= sym
.st_other
;
1374 /* Set a flag in the hash table entry indicating the type of
1375 reference or definition we just found. Keep a count of
1376 the number of dynamic symbols we find. A dynamic symbol
1377 is one which is referenced or defined by both a regular
1378 object and a shared object. */
1379 old_flags
= h
->elf_link_hash_flags
;
1385 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1386 if (bind
!= STB_WEAK
)
1387 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1390 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1392 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1393 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1399 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1401 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1402 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1403 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1404 || (h
->weakdef
!= NULL
1406 && h
->weakdef
->dynindx
!= -1))
1410 h
->elf_link_hash_flags
|= new_flag
;
1412 /* If this symbol has a version, and it is the default
1413 version, we create an indirect symbol from the default
1414 name to the fully decorated name. This will cause
1415 external references which do not specify a version to be
1416 bound to this version of the symbol. */
1421 p
= strchr (name
, ELF_VER_CHR
);
1422 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1425 struct elf_link_hash_entry
*hi
;
1428 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1430 if (shortname
== NULL
)
1432 strncpy (shortname
, name
, p
- name
);
1433 shortname
[p
- name
] = '\0';
1435 /* We are going to create a new symbol. Merge it
1436 with any existing symbol with this name. For the
1437 purposes of the merge, act as though we were
1438 defining the symbol we just defined, although we
1439 actually going to define an indirect symbol. */
1440 type_change_ok
= false;
1441 size_change_ok
= false;
1442 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1443 &value
, &hi
, &override
,
1444 &type_change_ok
, &size_change_ok
))
1449 if (! (_bfd_generic_link_add_one_symbol
1450 (info
, abfd
, shortname
, BSF_INDIRECT
,
1451 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1452 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1457 /* In this case the symbol named SHORTNAME is
1458 overriding the indirect symbol we want to
1459 add. We were planning on making SHORTNAME an
1460 indirect symbol referring to NAME. SHORTNAME
1461 is the name without a version. NAME is the
1462 fully versioned name, and it is the default
1465 Overriding means that we already saw a
1466 definition for the symbol SHORTNAME in a
1467 regular object, and it is overriding the
1468 symbol defined in the dynamic object.
1470 When this happens, we actually want to change
1471 NAME, the symbol we just added, to refer to
1472 SHORTNAME. This will cause references to
1473 NAME in the shared object to become
1474 references to SHORTNAME in the regular
1475 object. This is what we expect when we
1476 override a function in a shared object: that
1477 the references in the shared object will be
1478 mapped to the definition in the regular
1481 while (hi
->root
.type
== bfd_link_hash_indirect
1482 || hi
->root
.type
== bfd_link_hash_warning
)
1483 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1485 h
->root
.type
= bfd_link_hash_indirect
;
1486 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1487 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1489 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1490 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1491 if (hi
->elf_link_hash_flags
1492 & (ELF_LINK_HASH_REF_REGULAR
1493 | ELF_LINK_HASH_DEF_REGULAR
))
1495 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1501 /* Now set HI to H, so that the following code
1502 will set the other fields correctly. */
1506 /* If there is a duplicate definition somewhere,
1507 then HI may not point to an indirect symbol. We
1508 will have reported an error to the user in that
1511 if (hi
->root
.type
== bfd_link_hash_indirect
)
1513 struct elf_link_hash_entry
*ht
;
1515 /* If the symbol became indirect, then we assume
1516 that we have not seen a definition before. */
1517 BFD_ASSERT ((hi
->elf_link_hash_flags
1518 & (ELF_LINK_HASH_DEF_DYNAMIC
1519 | ELF_LINK_HASH_DEF_REGULAR
))
1522 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1524 /* Copy down any references that we may have
1525 already seen to the symbol which just became
1527 ht
->elf_link_hash_flags
|=
1528 (hi
->elf_link_hash_flags
1529 & (ELF_LINK_HASH_REF_DYNAMIC
1530 | ELF_LINK_HASH_REF_REGULAR
1531 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1533 /* Copy over the global and procedure linkage table
1534 offset entries. These may have been already set
1535 up by a check_relocs routine. */
1536 if (ht
->got
.offset
== (bfd_vma
) -1)
1538 ht
->got
.offset
= hi
->got
.offset
;
1539 hi
->got
.offset
= (bfd_vma
) -1;
1541 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1543 if (ht
->plt
.offset
== (bfd_vma
) -1)
1545 ht
->plt
.offset
= hi
->plt
.offset
;
1546 hi
->plt
.offset
= (bfd_vma
) -1;
1548 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1550 if (ht
->dynindx
== -1)
1552 ht
->dynindx
= hi
->dynindx
;
1553 ht
->dynstr_index
= hi
->dynstr_index
;
1555 hi
->dynstr_index
= 0;
1557 BFD_ASSERT (hi
->dynindx
== -1);
1559 /* FIXME: There may be other information to copy
1560 over for particular targets. */
1562 /* See if the new flags lead us to realize that
1563 the symbol must be dynamic. */
1569 || ((hi
->elf_link_hash_flags
1570 & ELF_LINK_HASH_REF_DYNAMIC
)
1576 if ((hi
->elf_link_hash_flags
1577 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1583 /* We also need to define an indirection from the
1584 nondefault version of the symbol. */
1586 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1588 if (shortname
== NULL
)
1590 strncpy (shortname
, name
, p
- name
);
1591 strcpy (shortname
+ (p
- name
), p
+ 1);
1593 /* Once again, merge with any existing symbol. */
1594 type_change_ok
= false;
1595 size_change_ok
= false;
1596 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1597 &value
, &hi
, &override
,
1598 &type_change_ok
, &size_change_ok
))
1603 /* Here SHORTNAME is a versioned name, so we
1604 don't expect to see the type of override we
1605 do in the case above. */
1606 (*_bfd_error_handler
)
1607 (_("%s: warning: unexpected redefinition of `%s'"),
1608 bfd_get_filename (abfd
), shortname
);
1612 if (! (_bfd_generic_link_add_one_symbol
1613 (info
, abfd
, shortname
, BSF_INDIRECT
,
1614 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1615 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1618 /* If there is a duplicate definition somewhere,
1619 then HI may not point to an indirect symbol.
1620 We will have reported an error to the user in
1623 if (hi
->root
.type
== bfd_link_hash_indirect
)
1625 /* If the symbol became indirect, then we
1626 assume that we have not seen a definition
1628 BFD_ASSERT ((hi
->elf_link_hash_flags
1629 & (ELF_LINK_HASH_DEF_DYNAMIC
1630 | ELF_LINK_HASH_DEF_REGULAR
))
1633 /* Copy down any references that we may have
1634 already seen to the symbol which just
1636 h
->elf_link_hash_flags
|=
1637 (hi
->elf_link_hash_flags
1638 & (ELF_LINK_HASH_REF_DYNAMIC
1639 | ELF_LINK_HASH_REF_REGULAR
1640 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1642 /* Copy over the global and procedure linkage
1643 table offset entries. These may have been
1644 already set up by a check_relocs routine. */
1645 if (h
->got
.offset
== (bfd_vma
) -1)
1647 h
->got
.offset
= hi
->got
.offset
;
1648 hi
->got
.offset
= (bfd_vma
) -1;
1650 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1652 if (h
->plt
.offset
== (bfd_vma
) -1)
1654 h
->plt
.offset
= hi
->plt
.offset
;
1655 hi
->plt
.offset
= (bfd_vma
) -1;
1657 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1659 if (h
->dynindx
== -1)
1661 h
->dynindx
= hi
->dynindx
;
1662 h
->dynstr_index
= hi
->dynstr_index
;
1664 hi
->dynstr_index
= 0;
1666 BFD_ASSERT (hi
->dynindx
== -1);
1668 /* FIXME: There may be other information to
1669 copy over for particular targets. */
1671 /* See if the new flags lead us to realize
1672 that the symbol must be dynamic. */
1678 || ((hi
->elf_link_hash_flags
1679 & ELF_LINK_HASH_REF_DYNAMIC
)
1685 if ((hi
->elf_link_hash_flags
1686 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1695 if (dynsym
&& h
->dynindx
== -1)
1697 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1699 if (h
->weakdef
!= NULL
1701 && h
->weakdef
->dynindx
== -1)
1703 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1711 /* Now set the weakdefs field correctly for all the weak defined
1712 symbols we found. The only way to do this is to search all the
1713 symbols. Since we only need the information for non functions in
1714 dynamic objects, that's the only time we actually put anything on
1715 the list WEAKS. We need this information so that if a regular
1716 object refers to a symbol defined weakly in a dynamic object, the
1717 real symbol in the dynamic object is also put in the dynamic
1718 symbols; we also must arrange for both symbols to point to the
1719 same memory location. We could handle the general case of symbol
1720 aliasing, but a general symbol alias can only be generated in
1721 assembler code, handling it correctly would be very time
1722 consuming, and other ELF linkers don't handle general aliasing
1724 while (weaks
!= NULL
)
1726 struct elf_link_hash_entry
*hlook
;
1729 struct elf_link_hash_entry
**hpp
;
1730 struct elf_link_hash_entry
**hppend
;
1733 weaks
= hlook
->weakdef
;
1734 hlook
->weakdef
= NULL
;
1736 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1737 || hlook
->root
.type
== bfd_link_hash_defweak
1738 || hlook
->root
.type
== bfd_link_hash_common
1739 || hlook
->root
.type
== bfd_link_hash_indirect
);
1740 slook
= hlook
->root
.u
.def
.section
;
1741 vlook
= hlook
->root
.u
.def
.value
;
1743 hpp
= elf_sym_hashes (abfd
);
1744 hppend
= hpp
+ extsymcount
;
1745 for (; hpp
< hppend
; hpp
++)
1747 struct elf_link_hash_entry
*h
;
1750 if (h
!= NULL
&& h
!= hlook
1751 && h
->root
.type
== bfd_link_hash_defined
1752 && h
->root
.u
.def
.section
== slook
1753 && h
->root
.u
.def
.value
== vlook
)
1757 /* If the weak definition is in the list of dynamic
1758 symbols, make sure the real definition is put there
1760 if (hlook
->dynindx
!= -1
1761 && h
->dynindx
== -1)
1763 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1767 /* If the real definition is in the list of dynamic
1768 symbols, make sure the weak definition is put there
1769 as well. If we don't do this, then the dynamic
1770 loader might not merge the entries for the real
1771 definition and the weak definition. */
1772 if (h
->dynindx
!= -1
1773 && hlook
->dynindx
== -1)
1775 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1790 if (extversym
!= NULL
)
1796 /* If this object is the same format as the output object, and it is
1797 not a shared library, then let the backend look through the
1800 This is required to build global offset table entries and to
1801 arrange for dynamic relocs. It is not required for the
1802 particular common case of linking non PIC code, even when linking
1803 against shared libraries, but unfortunately there is no way of
1804 knowing whether an object file has been compiled PIC or not.
1805 Looking through the relocs is not particularly time consuming.
1806 The problem is that we must either (1) keep the relocs in memory,
1807 which causes the linker to require additional runtime memory or
1808 (2) read the relocs twice from the input file, which wastes time.
1809 This would be a good case for using mmap.
1811 I have no idea how to handle linking PIC code into a file of a
1812 different format. It probably can't be done. */
1813 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1815 && abfd
->xvec
== info
->hash
->creator
1816 && check_relocs
!= NULL
)
1820 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1822 Elf_Internal_Rela
*internal_relocs
;
1825 if ((o
->flags
& SEC_RELOC
) == 0
1826 || o
->reloc_count
== 0
1827 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1828 && (o
->flags
& SEC_DEBUGGING
) != 0)
1829 || bfd_is_abs_section (o
->output_section
))
1832 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1833 (abfd
, o
, (PTR
) NULL
,
1834 (Elf_Internal_Rela
*) NULL
,
1835 info
->keep_memory
));
1836 if (internal_relocs
== NULL
)
1839 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1841 if (! info
->keep_memory
)
1842 free (internal_relocs
);
1849 /* If this is a non-traditional, non-relocateable link, try to
1850 optimize the handling of the .stab/.stabstr sections. */
1852 && ! info
->relocateable
1853 && ! info
->traditional_format
1854 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1855 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1857 asection
*stab
, *stabstr
;
1859 stab
= bfd_get_section_by_name (abfd
, ".stab");
1862 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1864 if (stabstr
!= NULL
)
1866 struct bfd_elf_section_data
*secdata
;
1868 secdata
= elf_section_data (stab
);
1869 if (! _bfd_link_section_stabs (abfd
,
1870 &elf_hash_table (info
)->stab_info
,
1872 &secdata
->stab_info
))
1887 if (extversym
!= NULL
)
1892 /* Create some sections which will be filled in with dynamic linking
1893 information. ABFD is an input file which requires dynamic sections
1894 to be created. The dynamic sections take up virtual memory space
1895 when the final executable is run, so we need to create them before
1896 addresses are assigned to the output sections. We work out the
1897 actual contents and size of these sections later. */
1900 elf_link_create_dynamic_sections (abfd
, info
)
1902 struct bfd_link_info
*info
;
1905 register asection
*s
;
1906 struct elf_link_hash_entry
*h
;
1907 struct elf_backend_data
*bed
;
1909 if (elf_hash_table (info
)->dynamic_sections_created
)
1912 /* Make sure that all dynamic sections use the same input BFD. */
1913 if (elf_hash_table (info
)->dynobj
== NULL
)
1914 elf_hash_table (info
)->dynobj
= abfd
;
1916 abfd
= elf_hash_table (info
)->dynobj
;
1918 /* Note that we set the SEC_IN_MEMORY flag for all of these
1920 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1921 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1923 /* A dynamically linked executable has a .interp section, but a
1924 shared library does not. */
1927 s
= bfd_make_section (abfd
, ".interp");
1929 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1933 /* Create sections to hold version informations. These are removed
1934 if they are not needed. */
1935 s
= bfd_make_section (abfd
, ".gnu.version_d");
1937 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1938 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1941 s
= bfd_make_section (abfd
, ".gnu.version");
1943 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1944 || ! bfd_set_section_alignment (abfd
, s
, 1))
1947 s
= bfd_make_section (abfd
, ".gnu.version_r");
1949 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1950 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1953 s
= bfd_make_section (abfd
, ".dynsym");
1955 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1956 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1959 s
= bfd_make_section (abfd
, ".dynstr");
1961 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1964 /* Create a strtab to hold the dynamic symbol names. */
1965 if (elf_hash_table (info
)->dynstr
== NULL
)
1967 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1968 if (elf_hash_table (info
)->dynstr
== NULL
)
1972 s
= bfd_make_section (abfd
, ".dynamic");
1974 || ! bfd_set_section_flags (abfd
, s
, flags
)
1975 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1978 /* The special symbol _DYNAMIC is always set to the start of the
1979 .dynamic section. This call occurs before we have processed the
1980 symbols for any dynamic object, so we don't have to worry about
1981 overriding a dynamic definition. We could set _DYNAMIC in a
1982 linker script, but we only want to define it if we are, in fact,
1983 creating a .dynamic section. We don't want to define it if there
1984 is no .dynamic section, since on some ELF platforms the start up
1985 code examines it to decide how to initialize the process. */
1987 if (! (_bfd_generic_link_add_one_symbol
1988 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1989 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1990 (struct bfd_link_hash_entry
**) &h
)))
1992 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1993 h
->type
= STT_OBJECT
;
1996 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1999 bed
= get_elf_backend_data (abfd
);
2001 s
= bfd_make_section (abfd
, ".hash");
2003 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2004 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2006 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2008 /* Let the backend create the rest of the sections. This lets the
2009 backend set the right flags. The backend will normally create
2010 the .got and .plt sections. */
2011 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2014 elf_hash_table (info
)->dynamic_sections_created
= true;
2019 /* Add an entry to the .dynamic table. */
2022 elf_add_dynamic_entry (info
, tag
, val
)
2023 struct bfd_link_info
*info
;
2027 Elf_Internal_Dyn dyn
;
2031 bfd_byte
*newcontents
;
2033 dynobj
= elf_hash_table (info
)->dynobj
;
2035 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2036 BFD_ASSERT (s
!= NULL
);
2038 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2039 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2040 if (newcontents
== NULL
)
2044 dyn
.d_un
.d_val
= val
;
2045 elf_swap_dyn_out (dynobj
, &dyn
,
2046 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2048 s
->_raw_size
= newsize
;
2049 s
->contents
= newcontents
;
2054 /* Record a new local dynamic symbol. */
2057 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2058 struct bfd_link_info
*info
;
2062 struct elf_link_local_dynamic_entry
*entry
;
2063 struct elf_link_hash_table
*eht
;
2064 struct bfd_strtab_hash
*dynstr
;
2065 Elf_External_Sym esym
;
2066 unsigned long dynstr_index
;
2069 /* See if the entry exists already. */
2070 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2071 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2074 entry
= (struct elf_link_local_dynamic_entry
*)
2075 bfd_alloc (input_bfd
, sizeof (*entry
));
2079 /* Go find the symbol, so that we can find it's name. */
2080 if (bfd_seek (input_bfd
,
2081 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2082 + input_indx
* sizeof (Elf_External_Sym
)),
2084 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2085 != sizeof (Elf_External_Sym
)))
2087 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2089 name
= (bfd_elf_string_from_elf_section
2090 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2091 entry
->isym
.st_name
));
2093 dynstr
= elf_hash_table (info
)->dynstr
;
2096 /* Create a strtab to hold the dynamic symbol names. */
2097 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2102 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2103 if (dynstr_index
== (unsigned long) -1)
2105 entry
->isym
.st_name
= dynstr_index
;
2107 eht
= elf_hash_table (info
);
2109 entry
->next
= eht
->dynlocal
;
2110 eht
->dynlocal
= entry
;
2111 entry
->input_bfd
= input_bfd
;
2112 entry
->input_indx
= input_indx
;
2115 /* The dynindx will be set at the end of size_dynamic_sections. */
2121 /* Read and swap the relocs from the section indicated by SHDR. This
2122 may be either a REL or a RELA section. The relocations are
2123 translated into RELA relocations and stored in INTERNAL_RELOCS,
2124 which should have already been allocated to contain enough space.
2125 The EXTERNAL_RELOCS are a buffer where the external form of the
2126 relocations should be stored.
2128 Returns false if something goes wrong. */
2131 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2134 Elf_Internal_Shdr
*shdr
;
2135 PTR external_relocs
;
2136 Elf_Internal_Rela
*internal_relocs
;
2138 struct elf_backend_data
*bed
;
2140 /* If there aren't any relocations, that's OK. */
2144 /* Position ourselves at the start of the section. */
2145 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2148 /* Read the relocations. */
2149 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2153 bed
= get_elf_backend_data (abfd
);
2155 /* Convert the external relocations to the internal format. */
2156 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2158 Elf_External_Rel
*erel
;
2159 Elf_External_Rel
*erelend
;
2160 Elf_Internal_Rela
*irela
;
2161 Elf_Internal_Rel
*irel
;
2163 erel
= (Elf_External_Rel
*) external_relocs
;
2164 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2165 irela
= internal_relocs
;
2166 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2167 * sizeof (Elf_Internal_Rel
)));
2168 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2172 if (bed
->s
->swap_reloc_in
)
2173 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2175 elf_swap_reloc_in (abfd
, erel
, irel
);
2177 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2179 irela
[i
].r_offset
= irel
[i
].r_offset
;
2180 irela
[i
].r_info
= irel
[i
].r_info
;
2181 irela
[i
].r_addend
= 0;
2187 Elf_External_Rela
*erela
;
2188 Elf_External_Rela
*erelaend
;
2189 Elf_Internal_Rela
*irela
;
2191 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2193 erela
= (Elf_External_Rela
*) external_relocs
;
2194 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2195 irela
= internal_relocs
;
2196 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2198 if (bed
->s
->swap_reloca_in
)
2199 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2201 elf_swap_reloca_in (abfd
, erela
, irela
);
2208 /* Read and swap the relocs for a section O. They may have been
2209 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2210 not NULL, they are used as buffers to read into. They are known to
2211 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2212 the return value is allocated using either malloc or bfd_alloc,
2213 according to the KEEP_MEMORY argument. If O has two relocation
2214 sections (both REL and RELA relocations), then the REL_HDR
2215 relocations will appear first in INTERNAL_RELOCS, followed by the
2216 REL_HDR2 relocations. */
2219 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2223 PTR external_relocs
;
2224 Elf_Internal_Rela
*internal_relocs
;
2225 boolean keep_memory
;
2227 Elf_Internal_Shdr
*rel_hdr
;
2229 Elf_Internal_Rela
*alloc2
= NULL
;
2230 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2232 if (elf_section_data (o
)->relocs
!= NULL
)
2233 return elf_section_data (o
)->relocs
;
2235 if (o
->reloc_count
== 0)
2238 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2240 if (internal_relocs
== NULL
)
2244 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2245 * sizeof (Elf_Internal_Rela
));
2247 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2249 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2250 if (internal_relocs
== NULL
)
2254 if (external_relocs
== NULL
)
2256 size_t size
= (size_t) rel_hdr
->sh_size
;
2258 if (elf_section_data (o
)->rel_hdr2
)
2259 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2260 alloc1
= (PTR
) bfd_malloc (size
);
2263 external_relocs
= alloc1
;
2266 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2270 if (!elf_link_read_relocs_from_section
2272 elf_section_data (o
)->rel_hdr2
,
2273 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2274 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2275 * bed
->s
->int_rels_per_ext_rel
)))
2278 /* Cache the results for next time, if we can. */
2280 elf_section_data (o
)->relocs
= internal_relocs
;
2285 /* Don't free alloc2, since if it was allocated we are passing it
2286 back (under the name of internal_relocs). */
2288 return internal_relocs
;
2299 /* Record an assignment to a symbol made by a linker script. We need
2300 this in case some dynamic object refers to this symbol. */
2304 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2305 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2306 struct bfd_link_info
*info
;
2310 struct elf_link_hash_entry
*h
;
2312 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2315 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2319 if (h
->root
.type
== bfd_link_hash_new
)
2320 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2322 /* If this symbol is being provided by the linker script, and it is
2323 currently defined by a dynamic object, but not by a regular
2324 object, then mark it as undefined so that the generic linker will
2325 force the correct value. */
2327 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2328 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2329 h
->root
.type
= bfd_link_hash_undefined
;
2331 /* If this symbol is not being provided by the linker script, and it is
2332 currently defined by a dynamic object, but not by a regular object,
2333 then clear out any version information because the symbol will not be
2334 associated with the dynamic object any more. */
2336 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2337 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2338 h
->verinfo
.verdef
= NULL
;
2340 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2341 h
->type
= STT_OBJECT
;
2343 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2344 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2346 && h
->dynindx
== -1)
2348 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2351 /* If this is a weak defined symbol, and we know a corresponding
2352 real symbol from the same dynamic object, make sure the real
2353 symbol is also made into a dynamic symbol. */
2354 if (h
->weakdef
!= NULL
2355 && h
->weakdef
->dynindx
== -1)
2357 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2365 /* This structure is used to pass information to
2366 elf_link_assign_sym_version. */
2368 struct elf_assign_sym_version_info
2372 /* General link information. */
2373 struct bfd_link_info
*info
;
2375 struct bfd_elf_version_tree
*verdefs
;
2376 /* Whether we are exporting all dynamic symbols. */
2377 boolean export_dynamic
;
2378 /* Whether we had a failure. */
2382 /* This structure is used to pass information to
2383 elf_link_find_version_dependencies. */
2385 struct elf_find_verdep_info
2389 /* General link information. */
2390 struct bfd_link_info
*info
;
2391 /* The number of dependencies. */
2393 /* Whether we had a failure. */
2397 /* Array used to determine the number of hash table buckets to use
2398 based on the number of symbols there are. If there are fewer than
2399 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2400 fewer than 37 we use 17 buckets, and so forth. We never use more
2401 than 32771 buckets. */
2403 static const size_t elf_buckets
[] =
2405 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2409 /* Compute bucket count for hashing table. We do not use a static set
2410 of possible tables sizes anymore. Instead we determine for all
2411 possible reasonable sizes of the table the outcome (i.e., the
2412 number of collisions etc) and choose the best solution. The
2413 weighting functions are not too simple to allow the table to grow
2414 without bounds. Instead one of the weighting factors is the size.
2415 Therefore the result is always a good payoff between few collisions
2416 (= short chain lengths) and table size. */
2418 compute_bucket_count (info
)
2419 struct bfd_link_info
*info
;
2421 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2422 size_t best_size
= 0;
2423 unsigned long int *hashcodes
;
2424 unsigned long int *hashcodesp
;
2425 unsigned long int i
;
2427 /* Compute the hash values for all exported symbols. At the same
2428 time store the values in an array so that we could use them for
2430 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2431 * sizeof (unsigned long int));
2432 if (hashcodes
== NULL
)
2434 hashcodesp
= hashcodes
;
2436 /* Put all hash values in HASHCODES. */
2437 elf_link_hash_traverse (elf_hash_table (info
),
2438 elf_collect_hash_codes
, &hashcodesp
);
2440 /* We have a problem here. The following code to optimize the table
2441 size requires an integer type with more the 32 bits. If
2442 BFD_HOST_U_64_BIT is set we know about such a type. */
2443 #ifdef BFD_HOST_U_64_BIT
2444 if (info
->optimize
== true)
2446 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2449 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2450 unsigned long int *counts
;
2452 /* Possible optimization parameters: if we have NSYMS symbols we say
2453 that the hashing table must at least have NSYMS/4 and at most
2455 minsize
= nsyms
/ 4;
2458 best_size
= maxsize
= nsyms
* 2;
2460 /* Create array where we count the collisions in. We must use bfd_malloc
2461 since the size could be large. */
2462 counts
= (unsigned long int *) bfd_malloc (maxsize
2463 * sizeof (unsigned long int));
2470 /* Compute the "optimal" size for the hash table. The criteria is a
2471 minimal chain length. The minor criteria is (of course) the size
2473 for (i
= minsize
; i
< maxsize
; ++i
)
2475 /* Walk through the array of hashcodes and count the collisions. */
2476 BFD_HOST_U_64_BIT max
;
2477 unsigned long int j
;
2478 unsigned long int fact
;
2480 memset (counts
, '\0', i
* sizeof (unsigned long int));
2482 /* Determine how often each hash bucket is used. */
2483 for (j
= 0; j
< nsyms
; ++j
)
2484 ++counts
[hashcodes
[j
] % i
];
2486 /* For the weight function we need some information about the
2487 pagesize on the target. This is information need not be 100%
2488 accurate. Since this information is not available (so far) we
2489 define it here to a reasonable default value. If it is crucial
2490 to have a better value some day simply define this value. */
2491 # ifndef BFD_TARGET_PAGESIZE
2492 # define BFD_TARGET_PAGESIZE (4096)
2495 /* We in any case need 2 + NSYMS entries for the size values and
2497 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2500 /* Variant 1: optimize for short chains. We add the squares
2501 of all the chain lengths (which favous many small chain
2502 over a few long chains). */
2503 for (j
= 0; j
< i
; ++j
)
2504 max
+= counts
[j
] * counts
[j
];
2506 /* This adds penalties for the overall size of the table. */
2507 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2510 /* Variant 2: Optimize a lot more for small table. Here we
2511 also add squares of the size but we also add penalties for
2512 empty slots (the +1 term). */
2513 for (j
= 0; j
< i
; ++j
)
2514 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2516 /* The overall size of the table is considered, but not as
2517 strong as in variant 1, where it is squared. */
2518 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2522 /* Compare with current best results. */
2523 if (max
< best_chlen
)
2533 #endif /* defined (BFD_HOST_U_64_BIT) */
2535 /* This is the fallback solution if no 64bit type is available or if we
2536 are not supposed to spend much time on optimizations. We select the
2537 bucket count using a fixed set of numbers. */
2538 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2540 best_size
= elf_buckets
[i
];
2541 if (dynsymcount
< elf_buckets
[i
+ 1])
2546 /* Free the arrays we needed. */
2552 /* Set up the sizes and contents of the ELF dynamic sections. This is
2553 called by the ELF linker emulation before_allocation routine. We
2554 must set the sizes of the sections before the linker sets the
2555 addresses of the various sections. */
2558 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2559 export_dynamic
, filter_shlib
,
2560 auxiliary_filters
, info
, sinterpptr
,
2565 boolean export_dynamic
;
2566 const char *filter_shlib
;
2567 const char * const *auxiliary_filters
;
2568 struct bfd_link_info
*info
;
2569 asection
**sinterpptr
;
2570 struct bfd_elf_version_tree
*verdefs
;
2572 bfd_size_type soname_indx
;
2574 struct elf_backend_data
*bed
;
2575 struct elf_assign_sym_version_info asvinfo
;
2579 soname_indx
= (bfd_size_type
) -1;
2581 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2584 /* The backend may have to create some sections regardless of whether
2585 we're dynamic or not. */
2586 bed
= get_elf_backend_data (output_bfd
);
2587 if (bed
->elf_backend_always_size_sections
2588 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2591 dynobj
= elf_hash_table (info
)->dynobj
;
2593 /* If there were no dynamic objects in the link, there is nothing to
2598 /* If we are supposed to export all symbols into the dynamic symbol
2599 table (this is not the normal case), then do so. */
2602 struct elf_info_failed eif
;
2606 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2612 if (elf_hash_table (info
)->dynamic_sections_created
)
2614 struct elf_info_failed eif
;
2615 struct elf_link_hash_entry
*h
;
2616 bfd_size_type strsize
;
2618 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2619 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2623 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2624 soname
, true, true);
2625 if (soname_indx
== (bfd_size_type
) -1
2626 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2632 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2640 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2642 if (indx
== (bfd_size_type
) -1
2643 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2647 if (filter_shlib
!= NULL
)
2651 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2652 filter_shlib
, true, true);
2653 if (indx
== (bfd_size_type
) -1
2654 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2658 if (auxiliary_filters
!= NULL
)
2660 const char * const *p
;
2662 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2666 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2668 if (indx
== (bfd_size_type
) -1
2669 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2674 /* Attach all the symbols to their version information. */
2675 asvinfo
.output_bfd
= output_bfd
;
2676 asvinfo
.info
= info
;
2677 asvinfo
.verdefs
= verdefs
;
2678 asvinfo
.export_dynamic
= export_dynamic
;
2679 asvinfo
.failed
= false;
2681 elf_link_hash_traverse (elf_hash_table (info
),
2682 elf_link_assign_sym_version
,
2687 /* Find all symbols which were defined in a dynamic object and make
2688 the backend pick a reasonable value for them. */
2691 elf_link_hash_traverse (elf_hash_table (info
),
2692 elf_adjust_dynamic_symbol
,
2697 /* Add some entries to the .dynamic section. We fill in some of the
2698 values later, in elf_bfd_final_link, but we must add the entries
2699 now so that we know the final size of the .dynamic section. */
2701 /* If there are initialization and/or finalization functions to
2702 call then add the corresponding DT_INIT/DT_FINI entries. */
2703 h
= (info
->init_function
2704 ? elf_link_hash_lookup (elf_hash_table (info
),
2705 info
->init_function
, false,
2709 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2710 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2712 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2715 h
= (info
->fini_function
2716 ? elf_link_hash_lookup (elf_hash_table (info
),
2717 info
->fini_function
, false,
2721 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2722 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2724 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2728 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2729 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2730 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2731 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2732 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2733 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2734 sizeof (Elf_External_Sym
)))
2738 /* The backend must work out the sizes of all the other dynamic
2740 if (bed
->elf_backend_size_dynamic_sections
2741 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2744 if (elf_hash_table (info
)->dynamic_sections_created
)
2748 size_t bucketcount
= 0;
2749 Elf_Internal_Sym isym
;
2750 size_t hash_entry_size
;
2752 /* Set up the version definition section. */
2753 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2754 BFD_ASSERT (s
!= NULL
);
2756 /* We may have created additional version definitions if we are
2757 just linking a regular application. */
2758 verdefs
= asvinfo
.verdefs
;
2760 if (verdefs
== NULL
)
2761 _bfd_strip_section_from_output (s
);
2766 struct bfd_elf_version_tree
*t
;
2768 Elf_Internal_Verdef def
;
2769 Elf_Internal_Verdaux defaux
;
2774 /* Make space for the base version. */
2775 size
+= sizeof (Elf_External_Verdef
);
2776 size
+= sizeof (Elf_External_Verdaux
);
2779 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2781 struct bfd_elf_version_deps
*n
;
2783 size
+= sizeof (Elf_External_Verdef
);
2784 size
+= sizeof (Elf_External_Verdaux
);
2787 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2788 size
+= sizeof (Elf_External_Verdaux
);
2791 s
->_raw_size
= size
;
2792 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2793 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2796 /* Fill in the version definition section. */
2800 def
.vd_version
= VER_DEF_CURRENT
;
2801 def
.vd_flags
= VER_FLG_BASE
;
2804 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2805 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2806 + sizeof (Elf_External_Verdaux
));
2808 if (soname_indx
!= (bfd_size_type
) -1)
2810 def
.vd_hash
= bfd_elf_hash (soname
);
2811 defaux
.vda_name
= soname_indx
;
2818 name
= output_bfd
->filename
;
2819 def
.vd_hash
= bfd_elf_hash (name
);
2820 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2822 if (indx
== (bfd_size_type
) -1)
2824 defaux
.vda_name
= indx
;
2826 defaux
.vda_next
= 0;
2828 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2829 (Elf_External_Verdef
*)p
);
2830 p
+= sizeof (Elf_External_Verdef
);
2831 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2832 (Elf_External_Verdaux
*) p
);
2833 p
+= sizeof (Elf_External_Verdaux
);
2835 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2838 struct bfd_elf_version_deps
*n
;
2839 struct elf_link_hash_entry
*h
;
2842 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2845 /* Add a symbol representing this version. */
2847 if (! (_bfd_generic_link_add_one_symbol
2848 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2849 (bfd_vma
) 0, (const char *) NULL
, false,
2850 get_elf_backend_data (dynobj
)->collect
,
2851 (struct bfd_link_hash_entry
**) &h
)))
2853 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2854 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2855 h
->type
= STT_OBJECT
;
2856 h
->verinfo
.vertree
= t
;
2858 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2861 def
.vd_version
= VER_DEF_CURRENT
;
2863 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2864 def
.vd_flags
|= VER_FLG_WEAK
;
2865 def
.vd_ndx
= t
->vernum
+ 1;
2866 def
.vd_cnt
= cdeps
+ 1;
2867 def
.vd_hash
= bfd_elf_hash (t
->name
);
2868 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2869 if (t
->next
!= NULL
)
2870 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2871 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2875 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2876 (Elf_External_Verdef
*) p
);
2877 p
+= sizeof (Elf_External_Verdef
);
2879 defaux
.vda_name
= h
->dynstr_index
;
2880 if (t
->deps
== NULL
)
2881 defaux
.vda_next
= 0;
2883 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2884 t
->name_indx
= defaux
.vda_name
;
2886 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2887 (Elf_External_Verdaux
*) p
);
2888 p
+= sizeof (Elf_External_Verdaux
);
2890 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2892 if (n
->version_needed
== NULL
)
2894 /* This can happen if there was an error in the
2896 defaux
.vda_name
= 0;
2899 defaux
.vda_name
= n
->version_needed
->name_indx
;
2900 if (n
->next
== NULL
)
2901 defaux
.vda_next
= 0;
2903 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2905 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2906 (Elf_External_Verdaux
*) p
);
2907 p
+= sizeof (Elf_External_Verdaux
);
2911 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2912 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2915 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2918 /* Work out the size of the version reference section. */
2920 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2921 BFD_ASSERT (s
!= NULL
);
2923 struct elf_find_verdep_info sinfo
;
2925 sinfo
.output_bfd
= output_bfd
;
2927 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2928 if (sinfo
.vers
== 0)
2930 sinfo
.failed
= false;
2932 elf_link_hash_traverse (elf_hash_table (info
),
2933 elf_link_find_version_dependencies
,
2936 if (elf_tdata (output_bfd
)->verref
== NULL
)
2937 _bfd_strip_section_from_output (s
);
2940 Elf_Internal_Verneed
*t
;
2945 /* Build the version definition section. */
2948 for (t
= elf_tdata (output_bfd
)->verref
;
2952 Elf_Internal_Vernaux
*a
;
2954 size
+= sizeof (Elf_External_Verneed
);
2956 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2957 size
+= sizeof (Elf_External_Vernaux
);
2960 s
->_raw_size
= size
;
2961 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2962 if (s
->contents
== NULL
)
2966 for (t
= elf_tdata (output_bfd
)->verref
;
2971 Elf_Internal_Vernaux
*a
;
2975 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2978 t
->vn_version
= VER_NEED_CURRENT
;
2980 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2981 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2982 elf_dt_name (t
->vn_bfd
),
2985 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2986 t
->vn_bfd
->filename
, true, false);
2987 if (indx
== (bfd_size_type
) -1)
2990 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2991 if (t
->vn_nextref
== NULL
)
2994 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2995 + caux
* sizeof (Elf_External_Vernaux
));
2997 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2998 (Elf_External_Verneed
*) p
);
2999 p
+= sizeof (Elf_External_Verneed
);
3001 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3003 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3004 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3005 a
->vna_nodename
, true, false);
3006 if (indx
== (bfd_size_type
) -1)
3009 if (a
->vna_nextptr
== NULL
)
3012 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3014 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3015 (Elf_External_Vernaux
*) p
);
3016 p
+= sizeof (Elf_External_Vernaux
);
3020 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3021 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3024 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3028 /* Assign dynsym indicies. In a shared library we generate a
3029 section symbol for each output section, which come first.
3030 Next come all of the back-end allocated local dynamic syms,
3031 followed by the rest of the global symbols. */
3033 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3035 /* Work out the size of the symbol version section. */
3036 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3037 BFD_ASSERT (s
!= NULL
);
3038 if (dynsymcount
== 0
3039 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3041 _bfd_strip_section_from_output (s
);
3042 /* The DYNSYMCOUNT might have changed if we were going to
3043 output a dynamic symbol table entry for S. */
3044 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3048 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3049 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3050 if (s
->contents
== NULL
)
3053 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3057 /* Set the size of the .dynsym and .hash sections. We counted
3058 the number of dynamic symbols in elf_link_add_object_symbols.
3059 We will build the contents of .dynsym and .hash when we build
3060 the final symbol table, because until then we do not know the
3061 correct value to give the symbols. We built the .dynstr
3062 section as we went along in elf_link_add_object_symbols. */
3063 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3064 BFD_ASSERT (s
!= NULL
);
3065 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3066 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3067 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3070 /* The first entry in .dynsym is a dummy symbol. */
3077 elf_swap_symbol_out (output_bfd
, &isym
,
3078 (PTR
) (Elf_External_Sym
*) s
->contents
);
3080 /* Compute the size of the hashing table. As a side effect this
3081 computes the hash values for all the names we export. */
3082 bucketcount
= compute_bucket_count (info
);
3084 s
= bfd_get_section_by_name (dynobj
, ".hash");
3085 BFD_ASSERT (s
!= NULL
);
3086 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3087 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3088 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3089 if (s
->contents
== NULL
)
3091 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3093 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3094 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3095 s
->contents
+ hash_entry_size
);
3097 elf_hash_table (info
)->bucketcount
= bucketcount
;
3099 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3100 BFD_ASSERT (s
!= NULL
);
3101 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3103 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3110 /* Fix up the flags for a symbol. This handles various cases which
3111 can only be fixed after all the input files are seen. This is
3112 currently called by both adjust_dynamic_symbol and
3113 assign_sym_version, which is unnecessary but perhaps more robust in
3114 the face of future changes. */
3117 elf_fix_symbol_flags (h
, eif
)
3118 struct elf_link_hash_entry
*h
;
3119 struct elf_info_failed
*eif
;
3121 /* If this symbol was mentioned in a non-ELF file, try to set
3122 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3123 permit a non-ELF file to correctly refer to a symbol defined in
3124 an ELF dynamic object. */
3125 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3127 if (h
->root
.type
!= bfd_link_hash_defined
3128 && h
->root
.type
!= bfd_link_hash_defweak
)
3129 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3130 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3133 if (h
->root
.u
.def
.section
->owner
!= NULL
3134 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3135 == bfd_target_elf_flavour
))
3136 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3137 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3139 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3142 if (h
->dynindx
== -1
3143 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3144 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3146 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3155 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3156 was first seen in a non-ELF file. Fortunately, if the symbol
3157 was first seen in an ELF file, we're probably OK unless the
3158 symbol was defined in a non-ELF file. Catch that case here.
3159 FIXME: We're still in trouble if the symbol was first seen in
3160 a dynamic object, and then later in a non-ELF regular object. */
3161 if ((h
->root
.type
== bfd_link_hash_defined
3162 || h
->root
.type
== bfd_link_hash_defweak
)
3163 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3164 && (h
->root
.u
.def
.section
->owner
!= NULL
3165 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3166 != bfd_target_elf_flavour
)
3167 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3168 && (h
->elf_link_hash_flags
3169 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3170 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3173 /* If this is a final link, and the symbol was defined as a common
3174 symbol in a regular object file, and there was no definition in
3175 any dynamic object, then the linker will have allocated space for
3176 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3177 flag will not have been set. */
3178 if (h
->root
.type
== bfd_link_hash_defined
3179 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3180 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3181 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3182 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3183 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3185 /* If -Bsymbolic was used (which means to bind references to global
3186 symbols to the definition within the shared object), and this
3187 symbol was defined in a regular object, then it actually doesn't
3188 need a PLT entry. */
3189 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3190 && eif
->info
->shared
3191 && eif
->info
->symbolic
3192 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3194 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3195 h
->plt
.offset
= (bfd_vma
) -1;
3201 /* Make the backend pick a good value for a dynamic symbol. This is
3202 called via elf_link_hash_traverse, and also calls itself
3206 elf_adjust_dynamic_symbol (h
, data
)
3207 struct elf_link_hash_entry
*h
;
3210 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3212 struct elf_backend_data
*bed
;
3214 /* Ignore indirect symbols. These are added by the versioning code. */
3215 if (h
->root
.type
== bfd_link_hash_indirect
)
3218 /* Fix the symbol flags. */
3219 if (! elf_fix_symbol_flags (h
, eif
))
3222 /* If this symbol does not require a PLT entry, and it is not
3223 defined by a dynamic object, or is not referenced by a regular
3224 object, ignore it. We do have to handle a weak defined symbol,
3225 even if no regular object refers to it, if we decided to add it
3226 to the dynamic symbol table. FIXME: Do we normally need to worry
3227 about symbols which are defined by one dynamic object and
3228 referenced by another one? */
3229 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3230 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3231 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3232 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3233 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3235 h
->plt
.offset
= (bfd_vma
) -1;
3239 /* If we've already adjusted this symbol, don't do it again. This
3240 can happen via a recursive call. */
3241 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3244 /* Don't look at this symbol again. Note that we must set this
3245 after checking the above conditions, because we may look at a
3246 symbol once, decide not to do anything, and then get called
3247 recursively later after REF_REGULAR is set below. */
3248 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3250 /* If this is a weak definition, and we know a real definition, and
3251 the real symbol is not itself defined by a regular object file,
3252 then get a good value for the real definition. We handle the
3253 real symbol first, for the convenience of the backend routine.
3255 Note that there is a confusing case here. If the real definition
3256 is defined by a regular object file, we don't get the real symbol
3257 from the dynamic object, but we do get the weak symbol. If the
3258 processor backend uses a COPY reloc, then if some routine in the
3259 dynamic object changes the real symbol, we will not see that
3260 change in the corresponding weak symbol. This is the way other
3261 ELF linkers work as well, and seems to be a result of the shared
3264 I will clarify this issue. Most SVR4 shared libraries define the
3265 variable _timezone and define timezone as a weak synonym. The
3266 tzset call changes _timezone. If you write
3267 extern int timezone;
3269 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3270 you might expect that, since timezone is a synonym for _timezone,
3271 the same number will print both times. However, if the processor
3272 backend uses a COPY reloc, then actually timezone will be copied
3273 into your process image, and, since you define _timezone
3274 yourself, _timezone will not. Thus timezone and _timezone will
3275 wind up at different memory locations. The tzset call will set
3276 _timezone, leaving timezone unchanged. */
3278 if (h
->weakdef
!= NULL
)
3280 struct elf_link_hash_entry
*weakdef
;
3282 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3283 || h
->root
.type
== bfd_link_hash_defweak
);
3284 weakdef
= h
->weakdef
;
3285 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3286 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3287 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3288 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3290 /* This symbol is defined by a regular object file, so we
3291 will not do anything special. Clear weakdef for the
3292 convenience of the processor backend. */
3297 /* There is an implicit reference by a regular object file
3298 via the weak symbol. */
3299 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3300 if (h
->weakdef
->elf_link_hash_flags
3301 & ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3302 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3303 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
3308 /* If a symbol has no type and no size and does not require a PLT
3309 entry, then we are probably about to do the wrong thing here: we
3310 are probably going to create a COPY reloc for an empty object.
3311 This case can arise when a shared object is built with assembly
3312 code, and the assembly code fails to set the symbol type. */
3314 && h
->type
== STT_NOTYPE
3315 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3316 (*_bfd_error_handler
)
3317 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3318 h
->root
.root
.string
);
3320 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3321 bed
= get_elf_backend_data (dynobj
);
3322 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3331 /* This routine is used to export all defined symbols into the dynamic
3332 symbol table. It is called via elf_link_hash_traverse. */
3335 elf_export_symbol (h
, data
)
3336 struct elf_link_hash_entry
*h
;
3339 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3341 /* Ignore indirect symbols. These are added by the versioning code. */
3342 if (h
->root
.type
== bfd_link_hash_indirect
)
3345 if (h
->dynindx
== -1
3346 && (h
->elf_link_hash_flags
3347 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3349 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3359 /* Look through the symbols which are defined in other shared
3360 libraries and referenced here. Update the list of version
3361 dependencies. This will be put into the .gnu.version_r section.
3362 This function is called via elf_link_hash_traverse. */
3365 elf_link_find_version_dependencies (h
, data
)
3366 struct elf_link_hash_entry
*h
;
3369 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3370 Elf_Internal_Verneed
*t
;
3371 Elf_Internal_Vernaux
*a
;
3373 /* We only care about symbols defined in shared objects with version
3375 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3376 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3378 || h
->verinfo
.verdef
== NULL
)
3381 /* See if we already know about this version. */
3382 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3384 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3387 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3388 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3394 /* This is a new version. Add it to tree we are building. */
3398 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3401 rinfo
->failed
= true;
3405 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3406 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3407 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3410 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3412 /* Note that we are copying a string pointer here, and testing it
3413 above. If bfd_elf_string_from_elf_section is ever changed to
3414 discard the string data when low in memory, this will have to be
3416 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3418 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3419 a
->vna_nextptr
= t
->vn_auxptr
;
3421 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3424 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3431 /* Figure out appropriate versions for all the symbols. We may not
3432 have the version number script until we have read all of the input
3433 files, so until that point we don't know which symbols should be
3434 local. This function is called via elf_link_hash_traverse. */
3437 elf_link_assign_sym_version (h
, data
)
3438 struct elf_link_hash_entry
*h
;
3441 struct elf_assign_sym_version_info
*sinfo
=
3442 (struct elf_assign_sym_version_info
*) data
;
3443 struct bfd_link_info
*info
= sinfo
->info
;
3444 struct elf_info_failed eif
;
3447 /* Fix the symbol flags. */
3450 if (! elf_fix_symbol_flags (h
, &eif
))
3453 sinfo
->failed
= true;
3457 /* We only need version numbers for symbols defined in regular
3459 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3462 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3463 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3465 struct bfd_elf_version_tree
*t
;
3470 /* There are two consecutive ELF_VER_CHR characters if this is
3471 not a hidden symbol. */
3473 if (*p
== ELF_VER_CHR
)
3479 /* If there is no version string, we can just return out. */
3483 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3487 /* Look for the version. If we find it, it is no longer weak. */
3488 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3490 if (strcmp (t
->name
, p
) == 0)
3494 struct bfd_elf_version_expr
*d
;
3496 len
= p
- h
->root
.root
.string
;
3497 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3500 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3501 alc
[len
- 1] = '\0';
3502 if (alc
[len
- 2] == ELF_VER_CHR
)
3503 alc
[len
- 2] = '\0';
3505 h
->verinfo
.vertree
= t
;
3509 if (t
->globals
!= NULL
)
3511 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3512 if ((*d
->match
) (d
, alc
))
3516 /* See if there is anything to force this symbol to
3518 if (d
== NULL
&& t
->locals
!= NULL
)
3520 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3522 if ((*d
->match
) (d
, alc
))
3524 if (h
->dynindx
!= -1
3526 && ! sinfo
->export_dynamic
)
3528 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3529 h
->elf_link_hash_flags
&=~
3530 ELF_LINK_HASH_NEEDS_PLT
;
3532 h
->plt
.offset
= (bfd_vma
) -1;
3533 /* FIXME: The name of the symbol has
3534 already been recorded in the dynamic
3535 string table section. */
3543 bfd_release (sinfo
->output_bfd
, alc
);
3548 /* If we are building an application, we need to create a
3549 version node for this version. */
3550 if (t
== NULL
&& ! info
->shared
)
3552 struct bfd_elf_version_tree
**pp
;
3555 /* If we aren't going to export this symbol, we don't need
3556 to worry about it. */
3557 if (h
->dynindx
== -1)
3560 t
= ((struct bfd_elf_version_tree
*)
3561 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3564 sinfo
->failed
= true;
3573 t
->name_indx
= (unsigned int) -1;
3577 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3579 t
->vernum
= version_index
;
3583 h
->verinfo
.vertree
= t
;
3587 /* We could not find the version for a symbol when
3588 generating a shared archive. Return an error. */
3589 (*_bfd_error_handler
)
3590 (_("%s: undefined versioned symbol name %s"),
3591 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3592 bfd_set_error (bfd_error_bad_value
);
3593 sinfo
->failed
= true;
3598 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3601 /* If we don't have a version for this symbol, see if we can find
3603 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3605 struct bfd_elf_version_tree
*t
;
3606 struct bfd_elf_version_tree
*deflt
;
3607 struct bfd_elf_version_expr
*d
;
3609 /* See if can find what version this symbol is in. If the
3610 symbol is supposed to be local, then don't actually register
3613 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3615 if (t
->globals
!= NULL
)
3617 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3619 if ((*d
->match
) (d
, h
->root
.root
.string
))
3621 h
->verinfo
.vertree
= t
;
3630 if (t
->locals
!= NULL
)
3632 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3634 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3636 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3638 h
->verinfo
.vertree
= t
;
3639 if (h
->dynindx
!= -1
3641 && ! sinfo
->export_dynamic
)
3643 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3644 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3646 h
->plt
.offset
= (bfd_vma
) -1;
3647 /* FIXME: The name of the symbol has already
3648 been recorded in the dynamic string table
3660 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3662 h
->verinfo
.vertree
= deflt
;
3663 if (h
->dynindx
!= -1
3665 && ! sinfo
->export_dynamic
)
3667 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3668 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3670 h
->plt
.offset
= (bfd_vma
) -1;
3671 /* FIXME: The name of the symbol has already been
3672 recorded in the dynamic string table section. */
3680 /* Final phase of ELF linker. */
3682 /* A structure we use to avoid passing large numbers of arguments. */
3684 struct elf_final_link_info
3686 /* General link information. */
3687 struct bfd_link_info
*info
;
3690 /* Symbol string table. */
3691 struct bfd_strtab_hash
*symstrtab
;
3692 /* .dynsym section. */
3693 asection
*dynsym_sec
;
3694 /* .hash section. */
3696 /* symbol version section (.gnu.version). */
3697 asection
*symver_sec
;
3698 /* Buffer large enough to hold contents of any section. */
3700 /* Buffer large enough to hold external relocs of any section. */
3701 PTR external_relocs
;
3702 /* Buffer large enough to hold internal relocs of any section. */
3703 Elf_Internal_Rela
*internal_relocs
;
3704 /* Buffer large enough to hold external local symbols of any input
3706 Elf_External_Sym
*external_syms
;
3707 /* Buffer large enough to hold internal local symbols of any input
3709 Elf_Internal_Sym
*internal_syms
;
3710 /* Array large enough to hold a symbol index for each local symbol
3711 of any input BFD. */
3713 /* Array large enough to hold a section pointer for each local
3714 symbol of any input BFD. */
3715 asection
**sections
;
3716 /* Buffer to hold swapped out symbols. */
3717 Elf_External_Sym
*symbuf
;
3718 /* Number of swapped out symbols in buffer. */
3719 size_t symbuf_count
;
3720 /* Number of symbols which fit in symbuf. */
3724 static boolean elf_link_output_sym
3725 PARAMS ((struct elf_final_link_info
*, const char *,
3726 Elf_Internal_Sym
*, asection
*));
3727 static boolean elf_link_flush_output_syms
3728 PARAMS ((struct elf_final_link_info
*));
3729 static boolean elf_link_output_extsym
3730 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3731 static boolean elf_link_input_bfd
3732 PARAMS ((struct elf_final_link_info
*, bfd
*));
3733 static boolean elf_reloc_link_order
3734 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3735 struct bfd_link_order
*));
3737 /* This struct is used to pass information to elf_link_output_extsym. */
3739 struct elf_outext_info
3743 struct elf_final_link_info
*finfo
;
3746 /* Compute the size of, and allocate space for, REL_HDR which is the
3747 section header for a section containing relocations for O. */
3750 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
3752 Elf_Internal_Shdr
*rel_hdr
;
3755 register struct elf_link_hash_entry
**p
, **pend
;
3757 /* We are overestimating the size required for the relocation
3758 sections, in the case that we are using both REL and RELA
3759 relocations for a single section. In that case, RELOC_COUNT will
3760 be the total number of relocations required, and we allocate
3761 space for that many REL relocations as well as that many RELA
3762 relocations. This approximation is wasteful of disk space.
3763 However, until we keep track of how many of each kind of
3764 relocation is required, it's difficult to calculate the right
3766 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3768 /* The contents field must last into write_object_contents, so we
3769 allocate it with bfd_alloc rather than malloc. */
3770 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3771 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3774 p
= ((struct elf_link_hash_entry
**)
3775 bfd_malloc (o
->reloc_count
3776 * sizeof (struct elf_link_hash_entry
*)));
3777 if (p
== NULL
&& o
->reloc_count
!= 0)
3780 elf_section_data (o
)->rel_hashes
= p
;
3781 pend
= p
+ o
->reloc_count
;
3782 for (; p
< pend
; p
++)
3788 /* When performing a relocateable link, the input relocations are
3789 preserved. But, if they reference global symbols, the indices
3790 referenced must be updated. Update all the relocations in
3791 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
3794 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
3796 Elf_Internal_Shdr
*rel_hdr
;
3798 struct elf_link_hash_entry
**rel_hash
;
3802 for (i
= 0; i
< count
; i
++, rel_hash
++)
3804 if (*rel_hash
== NULL
)
3807 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3809 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3811 Elf_External_Rel
*erel
;
3812 Elf_Internal_Rel irel
;
3814 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3815 elf_swap_reloc_in (abfd
, erel
, &irel
);
3816 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3817 ELF_R_TYPE (irel
.r_info
));
3818 elf_swap_reloc_out (abfd
, &irel
, erel
);
3822 Elf_External_Rela
*erela
;
3823 Elf_Internal_Rela irela
;
3825 BFD_ASSERT (rel_hdr
->sh_entsize
3826 == sizeof (Elf_External_Rela
));
3828 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3829 elf_swap_reloca_in (abfd
, erela
, &irela
);
3830 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3831 ELF_R_TYPE (irela
.r_info
));
3832 elf_swap_reloca_out (abfd
, &irela
, erela
);
3837 /* Do the final step of an ELF link. */
3840 elf_bfd_final_link (abfd
, info
)
3842 struct bfd_link_info
*info
;
3846 struct elf_final_link_info finfo
;
3847 register asection
*o
;
3848 register struct bfd_link_order
*p
;
3850 size_t max_contents_size
;
3851 size_t max_external_reloc_size
;
3852 size_t max_internal_reloc_count
;
3853 size_t max_sym_count
;
3855 Elf_Internal_Sym elfsym
;
3857 Elf_Internal_Shdr
*symtab_hdr
;
3858 Elf_Internal_Shdr
*symstrtab_hdr
;
3859 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3860 struct elf_outext_info eoinfo
;
3863 abfd
->flags
|= DYNAMIC
;
3865 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3866 dynobj
= elf_hash_table (info
)->dynobj
;
3869 finfo
.output_bfd
= abfd
;
3870 finfo
.symstrtab
= elf_stringtab_init ();
3871 if (finfo
.symstrtab
== NULL
)
3876 finfo
.dynsym_sec
= NULL
;
3877 finfo
.hash_sec
= NULL
;
3878 finfo
.symver_sec
= NULL
;
3882 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3883 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3884 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3885 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3886 /* Note that it is OK if symver_sec is NULL. */
3889 finfo
.contents
= NULL
;
3890 finfo
.external_relocs
= NULL
;
3891 finfo
.internal_relocs
= NULL
;
3892 finfo
.external_syms
= NULL
;
3893 finfo
.internal_syms
= NULL
;
3894 finfo
.indices
= NULL
;
3895 finfo
.sections
= NULL
;
3896 finfo
.symbuf
= NULL
;
3897 finfo
.symbuf_count
= 0;
3899 /* Count up the number of relocations we will output for each output
3900 section, so that we know the sizes of the reloc sections. We
3901 also figure out some maximum sizes. */
3902 max_contents_size
= 0;
3903 max_external_reloc_size
= 0;
3904 max_internal_reloc_count
= 0;
3906 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3910 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3912 if (p
->type
== bfd_section_reloc_link_order
3913 || p
->type
== bfd_symbol_reloc_link_order
)
3915 else if (p
->type
== bfd_indirect_link_order
)
3919 sec
= p
->u
.indirect
.section
;
3921 /* Mark all sections which are to be included in the
3922 link. This will normally be every section. We need
3923 to do this so that we can identify any sections which
3924 the linker has decided to not include. */
3925 sec
->linker_mark
= true;
3927 if (info
->relocateable
)
3928 o
->reloc_count
+= sec
->reloc_count
;
3930 if (sec
->_raw_size
> max_contents_size
)
3931 max_contents_size
= sec
->_raw_size
;
3932 if (sec
->_cooked_size
> max_contents_size
)
3933 max_contents_size
= sec
->_cooked_size
;
3935 /* We are interested in just local symbols, not all
3937 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3938 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3942 if (elf_bad_symtab (sec
->owner
))
3943 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3944 / sizeof (Elf_External_Sym
));
3946 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3948 if (sym_count
> max_sym_count
)
3949 max_sym_count
= sym_count
;
3951 if ((sec
->flags
& SEC_RELOC
) != 0)
3955 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3956 if (ext_size
> max_external_reloc_size
)
3957 max_external_reloc_size
= ext_size
;
3958 if (sec
->reloc_count
> max_internal_reloc_count
)
3959 max_internal_reloc_count
= sec
->reloc_count
;
3965 if (o
->reloc_count
> 0)
3966 o
->flags
|= SEC_RELOC
;
3969 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3970 set it (this is probably a bug) and if it is set
3971 assign_section_numbers will create a reloc section. */
3972 o
->flags
&=~ SEC_RELOC
;
3975 /* If the SEC_ALLOC flag is not set, force the section VMA to
3976 zero. This is done in elf_fake_sections as well, but forcing
3977 the VMA to 0 here will ensure that relocs against these
3978 sections are handled correctly. */
3979 if ((o
->flags
& SEC_ALLOC
) == 0
3980 && ! o
->user_set_vma
)
3984 /* Figure out the file positions for everything but the symbol table
3985 and the relocs. We set symcount to force assign_section_numbers
3986 to create a symbol table. */
3987 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
3988 BFD_ASSERT (! abfd
->output_has_begun
);
3989 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3992 /* That created the reloc sections. Set their sizes, and assign
3993 them file positions, and allocate some buffers. */
3994 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3996 if ((o
->flags
& SEC_RELOC
) != 0)
3998 if (!elf_link_size_reloc_section (abfd
,
3999 &elf_section_data (o
)->rel_hdr
,
4003 if (elf_section_data (o
)->rel_hdr2
4004 && !elf_link_size_reloc_section (abfd
,
4005 elf_section_data (o
)->rel_hdr2
,
4011 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4013 /* We have now assigned file positions for all the sections except
4014 .symtab and .strtab. We start the .symtab section at the current
4015 file position, and write directly to it. We build the .strtab
4016 section in memory. */
4017 bfd_get_symcount (abfd
) = 0;
4018 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4019 /* sh_name is set in prep_headers. */
4020 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4021 symtab_hdr
->sh_flags
= 0;
4022 symtab_hdr
->sh_addr
= 0;
4023 symtab_hdr
->sh_size
= 0;
4024 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4025 /* sh_link is set in assign_section_numbers. */
4026 /* sh_info is set below. */
4027 /* sh_offset is set just below. */
4028 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4030 off
= elf_tdata (abfd
)->next_file_pos
;
4031 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4033 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4034 incorrect. We do not yet know the size of the .symtab section.
4035 We correct next_file_pos below, after we do know the size. */
4037 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4038 continuously seeking to the right position in the file. */
4039 if (! info
->keep_memory
|| max_sym_count
< 20)
4040 finfo
.symbuf_size
= 20;
4042 finfo
.symbuf_size
= max_sym_count
;
4043 finfo
.symbuf
= ((Elf_External_Sym
*)
4044 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4045 if (finfo
.symbuf
== NULL
)
4048 /* Start writing out the symbol table. The first symbol is always a
4050 if (info
->strip
!= strip_all
|| info
->relocateable
)
4052 elfsym
.st_value
= 0;
4055 elfsym
.st_other
= 0;
4056 elfsym
.st_shndx
= SHN_UNDEF
;
4057 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4058 &elfsym
, bfd_und_section_ptr
))
4063 /* Some standard ELF linkers do this, but we don't because it causes
4064 bootstrap comparison failures. */
4065 /* Output a file symbol for the output file as the second symbol.
4066 We output this even if we are discarding local symbols, although
4067 I'm not sure if this is correct. */
4068 elfsym
.st_value
= 0;
4070 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4071 elfsym
.st_other
= 0;
4072 elfsym
.st_shndx
= SHN_ABS
;
4073 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4074 &elfsym
, bfd_abs_section_ptr
))
4078 /* Output a symbol for each section. We output these even if we are
4079 discarding local symbols, since they are used for relocs. These
4080 symbols have no names. We store the index of each one in the
4081 index field of the section, so that we can find it again when
4082 outputting relocs. */
4083 if (info
->strip
!= strip_all
|| info
->relocateable
)
4086 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4087 elfsym
.st_other
= 0;
4088 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4090 o
= section_from_elf_index (abfd
, i
);
4092 o
->target_index
= bfd_get_symcount (abfd
);
4093 elfsym
.st_shndx
= i
;
4094 if (info
->relocateable
|| o
== NULL
)
4095 elfsym
.st_value
= 0;
4097 elfsym
.st_value
= o
->vma
;
4098 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4104 /* Allocate some memory to hold information read in from the input
4106 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4107 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4108 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4109 bfd_malloc (max_internal_reloc_count
4110 * sizeof (Elf_Internal_Rela
)
4111 * bed
->s
->int_rels_per_ext_rel
));
4112 finfo
.external_syms
= ((Elf_External_Sym
*)
4113 bfd_malloc (max_sym_count
4114 * sizeof (Elf_External_Sym
)));
4115 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4116 bfd_malloc (max_sym_count
4117 * sizeof (Elf_Internal_Sym
)));
4118 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4119 finfo
.sections
= ((asection
**)
4120 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4121 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4122 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4123 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4124 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4125 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4126 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4127 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4130 /* Since ELF permits relocations to be against local symbols, we
4131 must have the local symbols available when we do the relocations.
4132 Since we would rather only read the local symbols once, and we
4133 would rather not keep them in memory, we handle all the
4134 relocations for a single input file at the same time.
4136 Unfortunately, there is no way to know the total number of local
4137 symbols until we have seen all of them, and the local symbol
4138 indices precede the global symbol indices. This means that when
4139 we are generating relocateable output, and we see a reloc against
4140 a global symbol, we can not know the symbol index until we have
4141 finished examining all the local symbols to see which ones we are
4142 going to output. To deal with this, we keep the relocations in
4143 memory, and don't output them until the end of the link. This is
4144 an unfortunate waste of memory, but I don't see a good way around
4145 it. Fortunately, it only happens when performing a relocateable
4146 link, which is not the common case. FIXME: If keep_memory is set
4147 we could write the relocs out and then read them again; I don't
4148 know how bad the memory loss will be. */
4150 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4151 sub
->output_has_begun
= false;
4152 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4154 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4156 if (p
->type
== bfd_indirect_link_order
4157 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4158 == bfd_target_elf_flavour
))
4160 sub
= p
->u
.indirect
.section
->owner
;
4161 if (! sub
->output_has_begun
)
4163 if (! elf_link_input_bfd (&finfo
, sub
))
4165 sub
->output_has_begun
= true;
4168 else if (p
->type
== bfd_section_reloc_link_order
4169 || p
->type
== bfd_symbol_reloc_link_order
)
4171 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4176 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4182 /* That wrote out all the local symbols. Finish up the symbol table
4183 with the global symbols. */
4185 if (info
->strip
!= strip_all
&& info
->shared
)
4187 /* Output any global symbols that got converted to local in a
4188 version script. We do this in a separate step since ELF
4189 requires all local symbols to appear prior to any global
4190 symbols. FIXME: We should only do this if some global
4191 symbols were, in fact, converted to become local. FIXME:
4192 Will this work correctly with the Irix 5 linker? */
4193 eoinfo
.failed
= false;
4194 eoinfo
.finfo
= &finfo
;
4195 eoinfo
.localsyms
= true;
4196 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4202 /* The sh_info field records the index of the first non local symbol. */
4203 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4207 Elf_Internal_Sym sym
;
4208 Elf_External_Sym
*dynsym
=
4209 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4210 unsigned long last_local
= 0;
4212 /* Write out the section symbols for the output sections. */
4219 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4222 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4225 indx
= elf_section_data (s
)->this_idx
;
4226 BFD_ASSERT (indx
> 0);
4227 sym
.st_shndx
= indx
;
4228 sym
.st_value
= s
->vma
;
4230 elf_swap_symbol_out (abfd
, &sym
,
4231 dynsym
+ elf_section_data (s
)->dynindx
);
4234 last_local
= bfd_count_sections (abfd
);
4237 /* Write out the local dynsyms. */
4238 if (elf_hash_table (info
)->dynlocal
)
4240 struct elf_link_local_dynamic_entry
*e
;
4241 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4245 sym
.st_size
= e
->isym
.st_size
;
4246 sym
.st_other
= e
->isym
.st_other
;
4248 /* Note that we saved a word of storage and overwrote
4249 the original st_name with the dynstr_index. */
4250 sym
.st_name
= e
->isym
.st_name
;
4252 /* Whatever binding the symbol had before, it's now local. */
4253 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
,
4254 ELF_ST_TYPE (e
->isym
.st_info
));
4256 s
= bfd_section_from_elf_index (e
->input_bfd
, e
->isym
.st_shndx
);
4258 sym
.st_shndx
= elf_section_data (s
->output_section
)->this_idx
;
4259 sym
.st_value
= (s
->output_section
->vma
4261 + e
->isym
.st_value
);
4263 if (last_local
< e
->dynindx
)
4264 last_local
= e
->dynindx
;
4266 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4270 elf_section_data (finfo
.dynsym_sec
->output_section
)
4271 ->this_hdr
.sh_info
= last_local
;
4274 /* We get the global symbols from the hash table. */
4275 eoinfo
.failed
= false;
4276 eoinfo
.localsyms
= false;
4277 eoinfo
.finfo
= &finfo
;
4278 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4283 /* Flush all symbols to the file. */
4284 if (! elf_link_flush_output_syms (&finfo
))
4287 /* Now we know the size of the symtab section. */
4288 off
+= symtab_hdr
->sh_size
;
4290 /* Finish up and write out the symbol string table (.strtab)
4292 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4293 /* sh_name was set in prep_headers. */
4294 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4295 symstrtab_hdr
->sh_flags
= 0;
4296 symstrtab_hdr
->sh_addr
= 0;
4297 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4298 symstrtab_hdr
->sh_entsize
= 0;
4299 symstrtab_hdr
->sh_link
= 0;
4300 symstrtab_hdr
->sh_info
= 0;
4301 /* sh_offset is set just below. */
4302 symstrtab_hdr
->sh_addralign
= 1;
4304 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4305 elf_tdata (abfd
)->next_file_pos
= off
;
4307 if (bfd_get_symcount (abfd
) > 0)
4309 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4310 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4314 /* Adjust the relocs to have the correct symbol indices. */
4315 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4317 struct elf_link_hash_entry
**rel_hash
;
4318 Elf_Internal_Shdr
*rel_hdr
;
4320 if ((o
->flags
& SEC_RELOC
) == 0)
4323 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4324 elf_section_data (o
)->rel_count
,
4325 elf_section_data (o
)->rel_hashes
);
4326 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4327 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4328 elf_section_data (o
)->rel_count2
,
4329 (elf_section_data (o
)->rel_hashes
4330 + elf_section_data (o
)->rel_count
));
4332 /* Set the reloc_count field to 0 to prevent write_relocs from
4333 trying to swap the relocs out itself. */
4337 /* If we are linking against a dynamic object, or generating a
4338 shared library, finish up the dynamic linking information. */
4341 Elf_External_Dyn
*dyncon
, *dynconend
;
4343 /* Fix up .dynamic entries. */
4344 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4345 BFD_ASSERT (o
!= NULL
);
4347 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4348 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4349 for (; dyncon
< dynconend
; dyncon
++)
4351 Elf_Internal_Dyn dyn
;
4355 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4362 name
= info
->init_function
;
4365 name
= info
->fini_function
;
4368 struct elf_link_hash_entry
*h
;
4370 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4371 false, false, true);
4373 && (h
->root
.type
== bfd_link_hash_defined
4374 || h
->root
.type
== bfd_link_hash_defweak
))
4376 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4377 o
= h
->root
.u
.def
.section
;
4378 if (o
->output_section
!= NULL
)
4379 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4380 + o
->output_offset
);
4383 /* The symbol is imported from another shared
4384 library and does not apply to this one. */
4388 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4403 name
= ".gnu.version_d";
4406 name
= ".gnu.version_r";
4409 name
= ".gnu.version";
4411 o
= bfd_get_section_by_name (abfd
, name
);
4412 BFD_ASSERT (o
!= NULL
);
4413 dyn
.d_un
.d_ptr
= o
->vma
;
4414 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4421 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4426 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4428 Elf_Internal_Shdr
*hdr
;
4430 hdr
= elf_elfsections (abfd
)[i
];
4431 if (hdr
->sh_type
== type
4432 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4434 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4435 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4438 if (dyn
.d_un
.d_val
== 0
4439 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4440 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4444 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4450 /* If we have created any dynamic sections, then output them. */
4453 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4456 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4458 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4459 || o
->_raw_size
== 0)
4461 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4463 /* At this point, we are only interested in sections
4464 created by elf_link_create_dynamic_sections. */
4467 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4469 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4471 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4472 o
->contents
, o
->output_offset
,
4480 /* The contents of the .dynstr section are actually in a
4482 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4483 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4484 || ! _bfd_stringtab_emit (abfd
,
4485 elf_hash_table (info
)->dynstr
))
4491 /* If we have optimized stabs strings, output them. */
4492 if (elf_hash_table (info
)->stab_info
!= NULL
)
4494 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4498 if (finfo
.symstrtab
!= NULL
)
4499 _bfd_stringtab_free (finfo
.symstrtab
);
4500 if (finfo
.contents
!= NULL
)
4501 free (finfo
.contents
);
4502 if (finfo
.external_relocs
!= NULL
)
4503 free (finfo
.external_relocs
);
4504 if (finfo
.internal_relocs
!= NULL
)
4505 free (finfo
.internal_relocs
);
4506 if (finfo
.external_syms
!= NULL
)
4507 free (finfo
.external_syms
);
4508 if (finfo
.internal_syms
!= NULL
)
4509 free (finfo
.internal_syms
);
4510 if (finfo
.indices
!= NULL
)
4511 free (finfo
.indices
);
4512 if (finfo
.sections
!= NULL
)
4513 free (finfo
.sections
);
4514 if (finfo
.symbuf
!= NULL
)
4515 free (finfo
.symbuf
);
4516 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4518 if ((o
->flags
& SEC_RELOC
) != 0
4519 && elf_section_data (o
)->rel_hashes
!= NULL
)
4520 free (elf_section_data (o
)->rel_hashes
);
4523 elf_tdata (abfd
)->linker
= true;
4528 if (finfo
.symstrtab
!= NULL
)
4529 _bfd_stringtab_free (finfo
.symstrtab
);
4530 if (finfo
.contents
!= NULL
)
4531 free (finfo
.contents
);
4532 if (finfo
.external_relocs
!= NULL
)
4533 free (finfo
.external_relocs
);
4534 if (finfo
.internal_relocs
!= NULL
)
4535 free (finfo
.internal_relocs
);
4536 if (finfo
.external_syms
!= NULL
)
4537 free (finfo
.external_syms
);
4538 if (finfo
.internal_syms
!= NULL
)
4539 free (finfo
.internal_syms
);
4540 if (finfo
.indices
!= NULL
)
4541 free (finfo
.indices
);
4542 if (finfo
.sections
!= NULL
)
4543 free (finfo
.sections
);
4544 if (finfo
.symbuf
!= NULL
)
4545 free (finfo
.symbuf
);
4546 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4548 if ((o
->flags
& SEC_RELOC
) != 0
4549 && elf_section_data (o
)->rel_hashes
!= NULL
)
4550 free (elf_section_data (o
)->rel_hashes
);
4556 /* Add a symbol to the output symbol table. */
4559 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4560 struct elf_final_link_info
*finfo
;
4562 Elf_Internal_Sym
*elfsym
;
4563 asection
*input_sec
;
4565 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4566 struct bfd_link_info
*info
,
4571 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4572 elf_backend_link_output_symbol_hook
;
4573 if (output_symbol_hook
!= NULL
)
4575 if (! ((*output_symbol_hook
)
4576 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4580 if (name
== (const char *) NULL
|| *name
== '\0')
4581 elfsym
->st_name
= 0;
4582 else if (input_sec
->flags
& SEC_EXCLUDE
)
4583 elfsym
->st_name
= 0;
4586 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4589 if (elfsym
->st_name
== (unsigned long) -1)
4593 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4595 if (! elf_link_flush_output_syms (finfo
))
4599 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4600 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4601 ++finfo
->symbuf_count
;
4603 ++ bfd_get_symcount (finfo
->output_bfd
);
4608 /* Flush the output symbols to the file. */
4611 elf_link_flush_output_syms (finfo
)
4612 struct elf_final_link_info
*finfo
;
4614 if (finfo
->symbuf_count
> 0)
4616 Elf_Internal_Shdr
*symtab
;
4618 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4620 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4622 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4623 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4624 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4627 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4629 finfo
->symbuf_count
= 0;
4635 /* Add an external symbol to the symbol table. This is called from
4636 the hash table traversal routine. When generating a shared object,
4637 we go through the symbol table twice. The first time we output
4638 anything that might have been forced to local scope in a version
4639 script. The second time we output the symbols that are still
4643 elf_link_output_extsym (h
, data
)
4644 struct elf_link_hash_entry
*h
;
4647 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4648 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4650 Elf_Internal_Sym sym
;
4651 asection
*input_sec
;
4653 /* Decide whether to output this symbol in this pass. */
4654 if (eoinfo
->localsyms
)
4656 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4661 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4665 /* If we are not creating a shared library, and this symbol is
4666 referenced by a shared library but is not defined anywhere, then
4667 warn that it is undefined. If we do not do this, the runtime
4668 linker will complain that the symbol is undefined when the
4669 program is run. We don't have to worry about symbols that are
4670 referenced by regular files, because we will already have issued
4671 warnings for them. */
4672 if (! finfo
->info
->relocateable
4673 && ! (finfo
->info
->shared
4674 && !finfo
->info
->no_undefined
)
4675 && h
->root
.type
== bfd_link_hash_undefined
4676 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4677 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4679 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4680 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4681 (asection
*) NULL
, 0)))
4683 eoinfo
->failed
= true;
4688 /* We don't want to output symbols that have never been mentioned by
4689 a regular file, or that we have been told to strip. However, if
4690 h->indx is set to -2, the symbol is used by a reloc and we must
4694 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4695 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4696 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4697 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4699 else if (finfo
->info
->strip
== strip_all
4700 || (finfo
->info
->strip
== strip_some
4701 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4702 h
->root
.root
.string
,
4703 false, false) == NULL
))
4708 /* If we're stripping it, and it's not a dynamic symbol, there's
4709 nothing else to do. */
4710 if (strip
&& h
->dynindx
== -1)
4714 sym
.st_size
= h
->size
;
4715 sym
.st_other
= h
->other
;
4716 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4717 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4718 else if (h
->root
.type
== bfd_link_hash_undefweak
4719 || h
->root
.type
== bfd_link_hash_defweak
)
4720 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4722 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4724 switch (h
->root
.type
)
4727 case bfd_link_hash_new
:
4731 case bfd_link_hash_undefined
:
4732 input_sec
= bfd_und_section_ptr
;
4733 sym
.st_shndx
= SHN_UNDEF
;
4736 case bfd_link_hash_undefweak
:
4737 input_sec
= bfd_und_section_ptr
;
4738 sym
.st_shndx
= SHN_UNDEF
;
4741 case bfd_link_hash_defined
:
4742 case bfd_link_hash_defweak
:
4744 input_sec
= h
->root
.u
.def
.section
;
4745 if (input_sec
->output_section
!= NULL
)
4748 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4749 input_sec
->output_section
);
4750 if (sym
.st_shndx
== (unsigned short) -1)
4752 (*_bfd_error_handler
)
4753 (_("%s: could not find output section %s for input section %s"),
4754 bfd_get_filename (finfo
->output_bfd
),
4755 input_sec
->output_section
->name
,
4757 eoinfo
->failed
= true;
4761 /* ELF symbols in relocateable files are section relative,
4762 but in nonrelocateable files they are virtual
4764 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4765 if (! finfo
->info
->relocateable
)
4766 sym
.st_value
+= input_sec
->output_section
->vma
;
4770 BFD_ASSERT (input_sec
->owner
== NULL
4771 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4772 sym
.st_shndx
= SHN_UNDEF
;
4773 input_sec
= bfd_und_section_ptr
;
4778 case bfd_link_hash_common
:
4779 input_sec
= h
->root
.u
.c
.p
->section
;
4780 sym
.st_shndx
= SHN_COMMON
;
4781 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4784 case bfd_link_hash_indirect
:
4785 /* These symbols are created by symbol versioning. They point
4786 to the decorated version of the name. For example, if the
4787 symbol foo@@GNU_1.2 is the default, which should be used when
4788 foo is used with no version, then we add an indirect symbol
4789 foo which points to foo@@GNU_1.2. We ignore these symbols,
4790 since the indirected symbol is already in the hash table. If
4791 the indirect symbol is non-ELF, fall through and output it. */
4792 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4796 case bfd_link_hash_warning
:
4797 /* We can't represent these symbols in ELF, although a warning
4798 symbol may have come from a .gnu.warning.SYMBOL section. We
4799 just put the target symbol in the hash table. If the target
4800 symbol does not really exist, don't do anything. */
4801 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4803 return (elf_link_output_extsym
4804 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4807 /* Give the processor backend a chance to tweak the symbol value,
4808 and also to finish up anything that needs to be done for this
4810 if ((h
->dynindx
!= -1
4811 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4812 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4814 struct elf_backend_data
*bed
;
4816 bed
= get_elf_backend_data (finfo
->output_bfd
);
4817 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4818 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4820 eoinfo
->failed
= true;
4825 /* If we are marking the symbol as undefined, and there are no
4826 non-weak references to this symbol from a regular object, then
4827 mark the symbol as weak undefined. We can't do this earlier,
4828 because it might not be marked as undefined until the
4829 finish_dynamic_symbol routine gets through with it. */
4830 if (sym
.st_shndx
== SHN_UNDEF
4831 && sym
.st_info
== ELF_ST_INFO (STB_GLOBAL
, h
->type
)
4832 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
4833 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) == 0)
4834 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4836 /* If this symbol should be put in the .dynsym section, then put it
4837 there now. We have already know the symbol index. We also fill
4838 in the entry in the .hash section. */
4839 if (h
->dynindx
!= -1
4840 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4844 size_t hash_entry_size
;
4845 bfd_byte
*bucketpos
;
4848 sym
.st_name
= h
->dynstr_index
;
4850 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4851 (PTR
) (((Elf_External_Sym
*)
4852 finfo
->dynsym_sec
->contents
)
4855 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4856 bucket
= h
->elf_hash_value
% bucketcount
;
4858 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
4859 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4860 + (bucket
+ 2) * hash_entry_size
);
4861 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
4862 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4863 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
4864 ((bfd_byte
*) finfo
->hash_sec
->contents
4865 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
4867 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4869 Elf_Internal_Versym iversym
;
4871 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4873 if (h
->verinfo
.verdef
== NULL
)
4874 iversym
.vs_vers
= 0;
4876 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4880 if (h
->verinfo
.vertree
== NULL
)
4881 iversym
.vs_vers
= 1;
4883 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4886 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4887 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4889 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4890 (((Elf_External_Versym
*)
4891 finfo
->symver_sec
->contents
)
4896 /* If we're stripping it, then it was just a dynamic symbol, and
4897 there's nothing else to do. */
4901 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
4903 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4905 eoinfo
->failed
= true;
4912 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
4913 originated from the section given by INPUT_REL_HDR) to the
4917 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
4920 asection
*input_section
;
4921 Elf_Internal_Shdr
*input_rel_hdr
;
4922 Elf_Internal_Rela
*internal_relocs
;
4924 Elf_Internal_Rela
*irela
;
4925 Elf_Internal_Rela
*irelaend
;
4926 Elf_Internal_Shdr
*output_rel_hdr
;
4927 asection
*output_section
;
4928 unsigned int *rel_countp
= NULL
;
4930 output_section
= input_section
->output_section
;
4931 output_rel_hdr
= NULL
;
4933 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
4934 == input_rel_hdr
->sh_entsize
)
4936 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4937 rel_countp
= &elf_section_data (output_section
)->rel_count
;
4939 else if (elf_section_data (output_section
)->rel_hdr2
4940 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
4941 == input_rel_hdr
->sh_entsize
))
4943 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
4944 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
4947 BFD_ASSERT (output_rel_hdr
!= NULL
);
4949 irela
= internal_relocs
;
4950 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
4951 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4953 Elf_External_Rel
*erel
;
4955 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
4956 for (; irela
< irelaend
; irela
++, erel
++)
4958 Elf_Internal_Rel irel
;
4960 irel
.r_offset
= irela
->r_offset
;
4961 irel
.r_info
= irela
->r_info
;
4962 BFD_ASSERT (irela
->r_addend
== 0);
4963 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4968 Elf_External_Rela
*erela
;
4970 BFD_ASSERT (input_rel_hdr
->sh_entsize
4971 == sizeof (Elf_External_Rela
));
4972 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
4973 for (; irela
< irelaend
; irela
++, erela
++)
4974 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4977 /* Bump the counter, so that we know where to add the next set of
4979 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
4982 /* Link an input file into the linker output file. This function
4983 handles all the sections and relocations of the input file at once.
4984 This is so that we only have to read the local symbols once, and
4985 don't have to keep them in memory. */
4988 elf_link_input_bfd (finfo
, input_bfd
)
4989 struct elf_final_link_info
*finfo
;
4992 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4993 bfd
*, asection
*, bfd_byte
*,
4994 Elf_Internal_Rela
*,
4995 Elf_Internal_Sym
*, asection
**));
4997 Elf_Internal_Shdr
*symtab_hdr
;
5000 Elf_External_Sym
*external_syms
;
5001 Elf_External_Sym
*esym
;
5002 Elf_External_Sym
*esymend
;
5003 Elf_Internal_Sym
*isym
;
5005 asection
**ppsection
;
5007 struct elf_backend_data
*bed
;
5009 output_bfd
= finfo
->output_bfd
;
5010 bed
= get_elf_backend_data (output_bfd
);
5011 relocate_section
= bed
->elf_backend_relocate_section
;
5013 /* If this is a dynamic object, we don't want to do anything here:
5014 we don't want the local symbols, and we don't want the section
5016 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5019 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5020 if (elf_bad_symtab (input_bfd
))
5022 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5027 locsymcount
= symtab_hdr
->sh_info
;
5028 extsymoff
= symtab_hdr
->sh_info
;
5031 /* Read the local symbols. */
5032 if (symtab_hdr
->contents
!= NULL
)
5033 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5034 else if (locsymcount
== 0)
5035 external_syms
= NULL
;
5038 external_syms
= finfo
->external_syms
;
5039 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5040 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5041 locsymcount
, input_bfd
)
5042 != locsymcount
* sizeof (Elf_External_Sym
)))
5046 /* Swap in the local symbols and write out the ones which we know
5047 are going into the output file. */
5048 esym
= external_syms
;
5049 esymend
= esym
+ locsymcount
;
5050 isym
= finfo
->internal_syms
;
5051 pindex
= finfo
->indices
;
5052 ppsection
= finfo
->sections
;
5053 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5057 Elf_Internal_Sym osym
;
5059 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5062 if (elf_bad_symtab (input_bfd
))
5064 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5071 if (isym
->st_shndx
== SHN_UNDEF
)
5072 isec
= bfd_und_section_ptr
;
5073 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5074 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5075 else if (isym
->st_shndx
== SHN_ABS
)
5076 isec
= bfd_abs_section_ptr
;
5077 else if (isym
->st_shndx
== SHN_COMMON
)
5078 isec
= bfd_com_section_ptr
;
5087 /* Don't output the first, undefined, symbol. */
5088 if (esym
== external_syms
)
5091 /* If we are stripping all symbols, we don't want to output this
5093 if (finfo
->info
->strip
== strip_all
)
5096 /* We never output section symbols. Instead, we use the section
5097 symbol of the corresponding section in the output file. */
5098 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5101 /* If we are discarding all local symbols, we don't want to
5102 output this one. If we are generating a relocateable output
5103 file, then some of the local symbols may be required by
5104 relocs; we output them below as we discover that they are
5106 if (finfo
->info
->discard
== discard_all
)
5109 /* If this symbol is defined in a section which we are
5110 discarding, we don't need to keep it, but note that
5111 linker_mark is only reliable for sections that have contents.
5112 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5113 as well as linker_mark. */
5114 if (isym
->st_shndx
> 0
5115 && isym
->st_shndx
< SHN_LORESERVE
5117 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5118 || (! finfo
->info
->relocateable
5119 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5122 /* Get the name of the symbol. */
5123 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5128 /* See if we are discarding symbols with this name. */
5129 if ((finfo
->info
->strip
== strip_some
5130 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5132 || (finfo
->info
->discard
== discard_l
5133 && bfd_is_local_label_name (input_bfd
, name
)))
5136 /* If we get here, we are going to output this symbol. */
5140 /* Adjust the section index for the output file. */
5141 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5142 isec
->output_section
);
5143 if (osym
.st_shndx
== (unsigned short) -1)
5146 *pindex
= bfd_get_symcount (output_bfd
);
5148 /* ELF symbols in relocateable files are section relative, but
5149 in executable files they are virtual addresses. Note that
5150 this code assumes that all ELF sections have an associated
5151 BFD section with a reasonable value for output_offset; below
5152 we assume that they also have a reasonable value for
5153 output_section. Any special sections must be set up to meet
5154 these requirements. */
5155 osym
.st_value
+= isec
->output_offset
;
5156 if (! finfo
->info
->relocateable
)
5157 osym
.st_value
+= isec
->output_section
->vma
;
5159 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5163 /* Relocate the contents of each section. */
5164 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5168 if (! o
->linker_mark
)
5170 /* This section was omitted from the link. */
5174 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5175 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5178 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5180 /* Section was created by elf_link_create_dynamic_sections
5185 /* Get the contents of the section. They have been cached by a
5186 relaxation routine. Note that o is a section in an input
5187 file, so the contents field will not have been set by any of
5188 the routines which work on output files. */
5189 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5190 contents
= elf_section_data (o
)->this_hdr
.contents
;
5193 contents
= finfo
->contents
;
5194 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5195 (file_ptr
) 0, o
->_raw_size
))
5199 if ((o
->flags
& SEC_RELOC
) != 0)
5201 Elf_Internal_Rela
*internal_relocs
;
5203 /* Get the swapped relocs. */
5204 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5205 (input_bfd
, o
, finfo
->external_relocs
,
5206 finfo
->internal_relocs
, false));
5207 if (internal_relocs
== NULL
5208 && o
->reloc_count
> 0)
5211 /* Relocate the section by invoking a back end routine.
5213 The back end routine is responsible for adjusting the
5214 section contents as necessary, and (if using Rela relocs
5215 and generating a relocateable output file) adjusting the
5216 reloc addend as necessary.
5218 The back end routine does not have to worry about setting
5219 the reloc address or the reloc symbol index.
5221 The back end routine is given a pointer to the swapped in
5222 internal symbols, and can access the hash table entries
5223 for the external symbols via elf_sym_hashes (input_bfd).
5225 When generating relocateable output, the back end routine
5226 must handle STB_LOCAL/STT_SECTION symbols specially. The
5227 output symbol is going to be a section symbol
5228 corresponding to the output section, which will require
5229 the addend to be adjusted. */
5231 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5232 input_bfd
, o
, contents
,
5234 finfo
->internal_syms
,
5238 if (finfo
->info
->relocateable
)
5240 Elf_Internal_Rela
*irela
;
5241 Elf_Internal_Rela
*irelaend
;
5242 struct elf_link_hash_entry
**rel_hash
;
5243 Elf_Internal_Shdr
*input_rel_hdr
;
5245 /* Adjust the reloc addresses and symbol indices. */
5247 irela
= internal_relocs
;
5249 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5250 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5251 + elf_section_data (o
->output_section
)->rel_count
5252 + elf_section_data (o
->output_section
)->rel_count2
);
5253 for (; irela
< irelaend
; irela
++, rel_hash
++)
5255 unsigned long r_symndx
;
5256 Elf_Internal_Sym
*isym
;
5259 irela
->r_offset
+= o
->output_offset
;
5261 r_symndx
= ELF_R_SYM (irela
->r_info
);
5266 if (r_symndx
>= locsymcount
5267 || (elf_bad_symtab (input_bfd
)
5268 && finfo
->sections
[r_symndx
] == NULL
))
5270 struct elf_link_hash_entry
*rh
;
5273 /* This is a reloc against a global symbol. We
5274 have not yet output all the local symbols, so
5275 we do not know the symbol index of any global
5276 symbol. We set the rel_hash entry for this
5277 reloc to point to the global hash table entry
5278 for this symbol. The symbol index is then
5279 set at the end of elf_bfd_final_link. */
5280 indx
= r_symndx
- extsymoff
;
5281 rh
= elf_sym_hashes (input_bfd
)[indx
];
5282 while (rh
->root
.type
== bfd_link_hash_indirect
5283 || rh
->root
.type
== bfd_link_hash_warning
)
5284 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5286 /* Setting the index to -2 tells
5287 elf_link_output_extsym that this symbol is
5289 BFD_ASSERT (rh
->indx
< 0);
5297 /* This is a reloc against a local symbol. */
5300 isym
= finfo
->internal_syms
+ r_symndx
;
5301 sec
= finfo
->sections
[r_symndx
];
5302 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5304 /* I suppose the backend ought to fill in the
5305 section of any STT_SECTION symbol against a
5306 processor specific section. If we have
5307 discarded a section, the output_section will
5308 be the absolute section. */
5310 && (bfd_is_abs_section (sec
)
5311 || (sec
->output_section
!= NULL
5312 && bfd_is_abs_section (sec
->output_section
))))
5314 else if (sec
== NULL
|| sec
->owner
== NULL
)
5316 bfd_set_error (bfd_error_bad_value
);
5321 r_symndx
= sec
->output_section
->target_index
;
5322 BFD_ASSERT (r_symndx
!= 0);
5327 if (finfo
->indices
[r_symndx
] == -1)
5333 if (finfo
->info
->strip
== strip_all
)
5335 /* You can't do ld -r -s. */
5336 bfd_set_error (bfd_error_invalid_operation
);
5340 /* This symbol was skipped earlier, but
5341 since it is needed by a reloc, we
5342 must output it now. */
5343 link
= symtab_hdr
->sh_link
;
5344 name
= bfd_elf_string_from_elf_section (input_bfd
,
5350 osec
= sec
->output_section
;
5352 _bfd_elf_section_from_bfd_section (output_bfd
,
5354 if (isym
->st_shndx
== (unsigned short) -1)
5357 isym
->st_value
+= sec
->output_offset
;
5358 if (! finfo
->info
->relocateable
)
5359 isym
->st_value
+= osec
->vma
;
5361 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5363 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5367 r_symndx
= finfo
->indices
[r_symndx
];
5370 irela
->r_info
= ELF_R_INFO (r_symndx
,
5371 ELF_R_TYPE (irela
->r_info
));
5374 /* Swap out the relocs. */
5375 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5376 elf_link_output_relocs (output_bfd
, o
,
5380 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5381 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5383 elf_link_output_relocs (output_bfd
, o
,
5389 /* Write out the modified section contents. */
5390 if (elf_section_data (o
)->stab_info
== NULL
)
5392 if (! (o
->flags
& SEC_EXCLUDE
) &&
5393 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5394 contents
, o
->output_offset
,
5395 (o
->_cooked_size
!= 0
5402 if (! (_bfd_write_section_stabs
5403 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5404 o
, &elf_section_data (o
)->stab_info
, contents
)))
5412 /* Generate a reloc when linking an ELF file. This is a reloc
5413 requested by the linker, and does come from any input file. This
5414 is used to build constructor and destructor tables when linking
5418 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5420 struct bfd_link_info
*info
;
5421 asection
*output_section
;
5422 struct bfd_link_order
*link_order
;
5424 reloc_howto_type
*howto
;
5428 struct elf_link_hash_entry
**rel_hash_ptr
;
5429 Elf_Internal_Shdr
*rel_hdr
;
5431 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5434 bfd_set_error (bfd_error_bad_value
);
5438 addend
= link_order
->u
.reloc
.p
->addend
;
5440 /* Figure out the symbol index. */
5441 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5442 + elf_section_data (output_section
)->rel_count
5443 + elf_section_data (output_section
)->rel_count2
);
5444 if (link_order
->type
== bfd_section_reloc_link_order
)
5446 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5447 BFD_ASSERT (indx
!= 0);
5448 *rel_hash_ptr
= NULL
;
5452 struct elf_link_hash_entry
*h
;
5454 /* Treat a reloc against a defined symbol as though it were
5455 actually against the section. */
5456 h
= ((struct elf_link_hash_entry
*)
5457 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5458 link_order
->u
.reloc
.p
->u
.name
,
5459 false, false, true));
5461 && (h
->root
.type
== bfd_link_hash_defined
5462 || h
->root
.type
== bfd_link_hash_defweak
))
5466 section
= h
->root
.u
.def
.section
;
5467 indx
= section
->output_section
->target_index
;
5468 *rel_hash_ptr
= NULL
;
5469 /* It seems that we ought to add the symbol value to the
5470 addend here, but in practice it has already been added
5471 because it was passed to constructor_callback. */
5472 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5476 /* Setting the index to -2 tells elf_link_output_extsym that
5477 this symbol is used by a reloc. */
5484 if (! ((*info
->callbacks
->unattached_reloc
)
5485 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5486 (asection
*) NULL
, (bfd_vma
) 0)))
5492 /* If this is an inplace reloc, we must write the addend into the
5494 if (howto
->partial_inplace
&& addend
!= 0)
5497 bfd_reloc_status_type rstat
;
5501 size
= bfd_get_reloc_size (howto
);
5502 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5503 if (buf
== (bfd_byte
*) NULL
)
5505 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5511 case bfd_reloc_outofrange
:
5513 case bfd_reloc_overflow
:
5514 if (! ((*info
->callbacks
->reloc_overflow
)
5516 (link_order
->type
== bfd_section_reloc_link_order
5517 ? bfd_section_name (output_bfd
,
5518 link_order
->u
.reloc
.p
->u
.section
)
5519 : link_order
->u
.reloc
.p
->u
.name
),
5520 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5528 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5529 (file_ptr
) link_order
->offset
, size
);
5535 /* The address of a reloc is relative to the section in a
5536 relocateable file, and is a virtual address in an executable
5538 offset
= link_order
->offset
;
5539 if (! info
->relocateable
)
5540 offset
+= output_section
->vma
;
5542 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5544 if (rel_hdr
->sh_type
== SHT_REL
)
5546 Elf_Internal_Rel irel
;
5547 Elf_External_Rel
*erel
;
5549 irel
.r_offset
= offset
;
5550 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5551 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5552 + elf_section_data (output_section
)->rel_count
);
5553 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5557 Elf_Internal_Rela irela
;
5558 Elf_External_Rela
*erela
;
5560 irela
.r_offset
= offset
;
5561 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5562 irela
.r_addend
= addend
;
5563 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5564 + elf_section_data (output_section
)->rel_count
);
5565 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5568 ++elf_section_data (output_section
)->rel_count
;
5574 /* Allocate a pointer to live in a linker created section. */
5577 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5579 struct bfd_link_info
*info
;
5580 elf_linker_section_t
*lsect
;
5581 struct elf_link_hash_entry
*h
;
5582 const Elf_Internal_Rela
*rel
;
5584 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5585 elf_linker_section_pointers_t
*linker_section_ptr
;
5586 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5588 BFD_ASSERT (lsect
!= NULL
);
5590 /* Is this a global symbol? */
5593 /* Has this symbol already been allocated, if so, our work is done */
5594 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5599 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5600 /* Make sure this symbol is output as a dynamic symbol. */
5601 if (h
->dynindx
== -1)
5603 if (! elf_link_record_dynamic_symbol (info
, h
))
5607 if (lsect
->rel_section
)
5608 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5611 else /* Allocation of a pointer to a local symbol */
5613 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5615 /* Allocate a table to hold the local symbols if first time */
5618 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5619 register unsigned int i
;
5621 ptr
= (elf_linker_section_pointers_t
**)
5622 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5627 elf_local_ptr_offsets (abfd
) = ptr
;
5628 for (i
= 0; i
< num_symbols
; i
++)
5629 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5632 /* Has this symbol already been allocated, if so, our work is done */
5633 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5638 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5642 /* If we are generating a shared object, we need to
5643 output a R_<xxx>_RELATIVE reloc so that the
5644 dynamic linker can adjust this GOT entry. */
5645 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5646 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5650 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5651 from internal memory. */
5652 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5653 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5654 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5656 if (!linker_section_ptr
)
5659 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5660 linker_section_ptr
->addend
= rel
->r_addend
;
5661 linker_section_ptr
->which
= lsect
->which
;
5662 linker_section_ptr
->written_address_p
= false;
5663 *ptr_linker_section_ptr
= linker_section_ptr
;
5666 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5668 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5669 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5670 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5671 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5673 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5675 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5676 lsect
->sym_hash
->root
.root
.string
,
5677 (long)ARCH_SIZE
/ 8,
5678 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5684 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5686 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5689 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5690 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5698 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5701 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5704 /* Fill in the address for a pointer generated in alinker section. */
5707 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5710 struct bfd_link_info
*info
;
5711 elf_linker_section_t
*lsect
;
5712 struct elf_link_hash_entry
*h
;
5714 const Elf_Internal_Rela
*rel
;
5717 elf_linker_section_pointers_t
*linker_section_ptr
;
5719 BFD_ASSERT (lsect
!= NULL
);
5721 if (h
!= NULL
) /* global symbol */
5723 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5727 BFD_ASSERT (linker_section_ptr
!= NULL
);
5729 if (! elf_hash_table (info
)->dynamic_sections_created
5732 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5734 /* This is actually a static link, or it is a
5735 -Bsymbolic link and the symbol is defined
5736 locally. We must initialize this entry in the
5739 When doing a dynamic link, we create a .rela.<xxx>
5740 relocation entry to initialize the value. This
5741 is done in the finish_dynamic_symbol routine. */
5742 if (!linker_section_ptr
->written_address_p
)
5744 linker_section_ptr
->written_address_p
= true;
5745 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5746 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5750 else /* local symbol */
5752 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5753 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5754 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5755 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5759 BFD_ASSERT (linker_section_ptr
!= NULL
);
5761 /* Write out pointer if it hasn't been rewritten out before */
5762 if (!linker_section_ptr
->written_address_p
)
5764 linker_section_ptr
->written_address_p
= true;
5765 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5766 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5770 asection
*srel
= lsect
->rel_section
;
5771 Elf_Internal_Rela outrel
;
5773 /* We need to generate a relative reloc for the dynamic linker. */
5775 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5778 BFD_ASSERT (srel
!= NULL
);
5780 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5781 + lsect
->section
->output_offset
5782 + linker_section_ptr
->offset
);
5783 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5784 outrel
.r_addend
= 0;
5785 elf_swap_reloca_out (output_bfd
, &outrel
,
5786 (((Elf_External_Rela
*)
5787 lsect
->section
->contents
)
5788 + elf_section_data (lsect
->section
)->rel_count
));
5789 ++elf_section_data (lsect
->section
)->rel_count
;
5794 relocation
= (lsect
->section
->output_offset
5795 + linker_section_ptr
->offset
5796 - lsect
->hole_offset
5797 - lsect
->sym_offset
);
5800 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5801 lsect
->name
, (long)relocation
, (long)relocation
);
5804 /* Subtract out the addend, because it will get added back in by the normal
5806 return relocation
- linker_section_ptr
->addend
;
5809 /* Garbage collect unused sections. */
5811 static boolean elf_gc_mark
5812 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5813 asection
* (*gc_mark_hook
)
5814 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5815 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5817 static boolean elf_gc_sweep
5818 PARAMS ((struct bfd_link_info
*info
,
5819 boolean (*gc_sweep_hook
)
5820 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5821 const Elf_Internal_Rela
*relocs
))));
5823 static boolean elf_gc_sweep_symbol
5824 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5826 static boolean elf_gc_allocate_got_offsets
5827 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5829 static boolean elf_gc_propagate_vtable_entries_used
5830 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5832 static boolean elf_gc_smash_unused_vtentry_relocs
5833 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5835 /* The mark phase of garbage collection. For a given section, mark
5836 it, and all the sections which define symbols to which it refers. */
5839 elf_gc_mark (info
, sec
, gc_mark_hook
)
5840 struct bfd_link_info
*info
;
5842 asection
* (*gc_mark_hook
)
5843 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5844 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5850 /* Look through the section relocs. */
5852 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5854 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5855 Elf_Internal_Shdr
*symtab_hdr
;
5856 struct elf_link_hash_entry
**sym_hashes
;
5859 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5860 bfd
*input_bfd
= sec
->owner
;
5861 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
5863 /* GCFIXME: how to arrange so that relocs and symbols are not
5864 reread continually? */
5866 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5867 sym_hashes
= elf_sym_hashes (input_bfd
);
5869 /* Read the local symbols. */
5870 if (elf_bad_symtab (input_bfd
))
5872 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5876 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5877 if (symtab_hdr
->contents
)
5878 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5879 else if (nlocsyms
== 0)
5883 locsyms
= freesyms
=
5884 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5885 if (freesyms
== NULL
5886 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5887 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5888 nlocsyms
, input_bfd
)
5889 != nlocsyms
* sizeof (Elf_External_Sym
)))
5896 /* Read the relocations. */
5897 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5898 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5899 info
->keep_memory
));
5900 if (relstart
== NULL
)
5905 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5907 for (rel
= relstart
; rel
< relend
; rel
++)
5909 unsigned long r_symndx
;
5911 struct elf_link_hash_entry
*h
;
5914 r_symndx
= ELF_R_SYM (rel
->r_info
);
5918 if (elf_bad_symtab (sec
->owner
))
5920 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5921 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5922 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5925 h
= sym_hashes
[r_symndx
- extsymoff
];
5926 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5929 else if (r_symndx
>= nlocsyms
)
5931 h
= sym_hashes
[r_symndx
- extsymoff
];
5932 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5936 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5937 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5940 if (rsec
&& !rsec
->gc_mark
)
5941 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
5949 if (!info
->keep_memory
)
5959 /* The sweep phase of garbage collection. Remove all garbage sections. */
5962 elf_gc_sweep (info
, gc_sweep_hook
)
5963 struct bfd_link_info
*info
;
5964 boolean (*gc_sweep_hook
)
5965 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5966 const Elf_Internal_Rela
*relocs
));
5970 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5974 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5976 /* Keep special sections. Keep .debug sections. */
5977 if ((o
->flags
& SEC_LINKER_CREATED
)
5978 || (o
->flags
& SEC_DEBUGGING
))
5984 /* Skip sweeping sections already excluded. */
5985 if (o
->flags
& SEC_EXCLUDE
)
5988 /* Since this is early in the link process, it is simple
5989 to remove a section from the output. */
5990 o
->flags
|= SEC_EXCLUDE
;
5992 /* But we also have to update some of the relocation
5993 info we collected before. */
5995 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
5997 Elf_Internal_Rela
*internal_relocs
;
6000 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6001 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6002 if (internal_relocs
== NULL
)
6005 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6007 if (!info
->keep_memory
)
6008 free (internal_relocs
);
6016 /* Remove the symbols that were in the swept sections from the dynamic
6017 symbol table. GCFIXME: Anyone know how to get them out of the
6018 static symbol table as well? */
6022 elf_link_hash_traverse (elf_hash_table (info
),
6023 elf_gc_sweep_symbol
,
6026 elf_hash_table (info
)->dynsymcount
= i
;
6032 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6035 elf_gc_sweep_symbol (h
, idxptr
)
6036 struct elf_link_hash_entry
*h
;
6039 int *idx
= (int *) idxptr
;
6041 if (h
->dynindx
!= -1
6042 && ((h
->root
.type
!= bfd_link_hash_defined
6043 && h
->root
.type
!= bfd_link_hash_defweak
)
6044 || h
->root
.u
.def
.section
->gc_mark
))
6045 h
->dynindx
= (*idx
)++;
6050 /* Propogate collected vtable information. This is called through
6051 elf_link_hash_traverse. */
6054 elf_gc_propagate_vtable_entries_used (h
, okp
)
6055 struct elf_link_hash_entry
*h
;
6058 /* Those that are not vtables. */
6059 if (h
->vtable_parent
== NULL
)
6062 /* Those vtables that do not have parents, we cannot merge. */
6063 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6066 /* If we've already been done, exit. */
6067 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6070 /* Make sure the parent's table is up to date. */
6071 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6073 if (h
->vtable_entries_used
== NULL
)
6075 /* None of this table's entries were referenced. Re-use the
6077 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6078 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6085 /* Or the parent's entries into ours. */
6086 cu
= h
->vtable_entries_used
;
6088 pu
= h
->vtable_parent
->vtable_entries_used
;
6091 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6094 if (*pu
) *cu
= true;
6104 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6105 struct elf_link_hash_entry
*h
;
6109 bfd_vma hstart
, hend
;
6110 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6111 struct elf_backend_data
*bed
;
6113 /* Take care of both those symbols that do not describe vtables as
6114 well as those that are not loaded. */
6115 if (h
->vtable_parent
== NULL
)
6118 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6119 || h
->root
.type
== bfd_link_hash_defweak
);
6121 sec
= h
->root
.u
.def
.section
;
6122 hstart
= h
->root
.u
.def
.value
;
6123 hend
= hstart
+ h
->size
;
6125 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6126 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6128 return *(boolean
*)okp
= false;
6129 bed
= get_elf_backend_data (sec
->owner
);
6130 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6132 for (rel
= relstart
; rel
< relend
; ++rel
)
6133 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6135 /* If the entry is in use, do nothing. */
6136 if (h
->vtable_entries_used
6137 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6139 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6140 if (h
->vtable_entries_used
[entry
])
6143 /* Otherwise, kill it. */
6144 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6150 /* Do mark and sweep of unused sections. */
6153 elf_gc_sections (abfd
, info
)
6155 struct bfd_link_info
*info
;
6159 asection
* (*gc_mark_hook
)
6160 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6161 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6163 if (!get_elf_backend_data (abfd
)->can_gc_sections
6164 || info
->relocateable
6165 || elf_hash_table (info
)->dynamic_sections_created
)
6168 /* Apply transitive closure to the vtable entry usage info. */
6169 elf_link_hash_traverse (elf_hash_table (info
),
6170 elf_gc_propagate_vtable_entries_used
,
6175 /* Kill the vtable relocations that were not used. */
6176 elf_link_hash_traverse (elf_hash_table (info
),
6177 elf_gc_smash_unused_vtentry_relocs
,
6182 /* Grovel through relocs to find out who stays ... */
6184 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6185 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6188 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6190 if (o
->flags
& SEC_KEEP
)
6191 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6196 /* ... and mark SEC_EXCLUDE for those that go. */
6197 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6203 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6206 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6209 struct elf_link_hash_entry
*h
;
6212 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6213 struct elf_link_hash_entry
**search
, *child
;
6214 bfd_size_type extsymcount
;
6216 /* The sh_info field of the symtab header tells us where the
6217 external symbols start. We don't care about the local symbols at
6219 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6220 if (!elf_bad_symtab (abfd
))
6221 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6223 sym_hashes
= elf_sym_hashes (abfd
);
6224 sym_hashes_end
= sym_hashes
+ extsymcount
;
6226 /* Hunt down the child symbol, which is in this section at the same
6227 offset as the relocation. */
6228 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6230 if ((child
= *search
) != NULL
6231 && (child
->root
.type
== bfd_link_hash_defined
6232 || child
->root
.type
== bfd_link_hash_defweak
)
6233 && child
->root
.u
.def
.section
== sec
6234 && child
->root
.u
.def
.value
== offset
)
6238 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6239 bfd_get_filename (abfd
), sec
->name
,
6240 (unsigned long)offset
);
6241 bfd_set_error (bfd_error_invalid_operation
);
6247 /* This *should* only be the absolute section. It could potentially
6248 be that someone has defined a non-global vtable though, which
6249 would be bad. It isn't worth paging in the local symbols to be
6250 sure though; that case should simply be handled by the assembler. */
6252 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6255 child
->vtable_parent
= h
;
6260 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6263 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6264 bfd
*abfd ATTRIBUTE_UNUSED
;
6265 asection
*sec ATTRIBUTE_UNUSED
;
6266 struct elf_link_hash_entry
*h
;
6269 if (addend
>= h
->vtable_entries_size
)
6272 boolean
*ptr
= h
->vtable_entries_used
;
6274 /* While the symbol is undefined, we have to be prepared to handle
6276 if (h
->root
.type
== bfd_link_hash_undefined
)
6283 /* Oops! We've got a reference past the defined end of
6284 the table. This is probably a bug -- shall we warn? */
6289 /* Allocate one extra entry for use as a "done" flag for the
6290 consolidation pass. */
6291 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
6297 ptr
= realloc (ptr
-1, bytes
);
6301 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof(boolean
);
6302 memset (ptr
+ oldbytes
, 0, bytes
- oldbytes
);
6306 ptr
= calloc (1, bytes
);
6311 /* And arrange for that done flag to be at index -1. */
6312 h
->vtable_entries_used
= ptr
+1;
6313 h
->vtable_entries_size
= size
;
6315 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6320 /* And an accompanying bit to work out final got entry offsets once
6321 we're done. Should be called from final_link. */
6324 elf_gc_common_finalize_got_offsets (abfd
, info
)
6326 struct bfd_link_info
*info
;
6329 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6332 /* The GOT offset is relative to the .got section, but the GOT header is
6333 put into the .got.plt section, if the backend uses it. */
6334 if (bed
->want_got_plt
)
6337 gotoff
= bed
->got_header_size
;
6339 /* Do the local .got entries first. */
6340 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6342 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
6343 bfd_size_type j
, locsymcount
;
6344 Elf_Internal_Shdr
*symtab_hdr
;
6349 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6350 if (elf_bad_symtab (i
))
6351 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6353 locsymcount
= symtab_hdr
->sh_info
;
6355 for (j
= 0; j
< locsymcount
; ++j
)
6357 if (local_got
[j
] > 0)
6359 local_got
[j
] = gotoff
;
6360 gotoff
+= ARCH_SIZE
/ 8;
6363 local_got
[j
] = (bfd_vma
) -1;
6367 /* Then the global .got and .plt entries. */
6368 elf_link_hash_traverse (elf_hash_table (info
),
6369 elf_gc_allocate_got_offsets
,
6374 /* We need a special top-level link routine to convert got reference counts
6375 to real got offsets. */
6378 elf_gc_allocate_got_offsets (h
, offarg
)
6379 struct elf_link_hash_entry
*h
;
6382 bfd_vma
*off
= (bfd_vma
*) offarg
;
6384 if (h
->got
.refcount
> 0)
6386 h
->got
.offset
= off
[0];
6387 off
[0] += ARCH_SIZE
/ 8;
6390 h
->got
.offset
= (bfd_vma
) -1;
6395 /* Many folk need no more in the way of final link than this, once
6396 got entry reference counting is enabled. */
6399 elf_gc_common_final_link (abfd
, info
)
6401 struct bfd_link_info
*info
;
6403 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6406 /* Invoke the regular ELF backend linker to do all the work. */
6407 return elf_bfd_final_link (abfd
, info
);
6410 /* This function will be called though elf_link_hash_traverse to store
6411 all hash value of the exported symbols in an array. */
6414 elf_collect_hash_codes (h
, data
)
6415 struct elf_link_hash_entry
*h
;
6418 unsigned long **valuep
= (unsigned long **) data
;
6424 /* Ignore indirect symbols. These are added by the versioning code. */
6425 if (h
->dynindx
== -1)
6428 name
= h
->root
.root
.string
;
6429 p
= strchr (name
, ELF_VER_CHR
);
6432 alc
= bfd_malloc (p
- name
+ 1);
6433 memcpy (alc
, name
, p
- name
);
6434 alc
[p
- name
] = '\0';
6438 /* Compute the hash value. */
6439 ha
= bfd_elf_hash (name
);
6441 /* Store the found hash value in the array given as the argument. */
6444 /* And store it in the struct so that we can put it in the hash table
6446 h
->elf_hash_value
= ha
;