2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* ELF linker code. */
23 /* This struct is used to pass information to routines called via
24 elf_link_hash_traverse which must return failure. */
26 struct elf_info_failed
29 struct bfd_link_info
*info
;
30 struct bfd_elf_version_tree
*verdefs
;
33 static boolean is_global_data_symbol_definition
34 PARAMS ((bfd
*, Elf_Internal_Sym
*));
35 static boolean elf_link_is_defined_archive_symbol
36 PARAMS ((bfd
*, carsym
*));
37 static boolean elf_link_add_object_symbols
38 PARAMS ((bfd
*, struct bfd_link_info
*));
39 static boolean elf_link_add_archive_symbols
40 PARAMS ((bfd
*, struct bfd_link_info
*));
41 static boolean elf_merge_symbol
42 PARAMS ((bfd
*, struct bfd_link_info
*, const char *,
43 Elf_Internal_Sym
*, asection
**, bfd_vma
*,
44 struct elf_link_hash_entry
**, boolean
*, boolean
*,
46 static boolean elf_add_default_symbol
47 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
48 const char *, Elf_Internal_Sym
*, asection
**, bfd_vma
*,
49 boolean
*, boolean
, boolean
));
50 static boolean elf_export_symbol
51 PARAMS ((struct elf_link_hash_entry
*, PTR
));
52 static boolean elf_finalize_dynstr
53 PARAMS ((bfd
*, struct bfd_link_info
*));
54 static boolean elf_fix_symbol_flags
55 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
56 static boolean elf_adjust_dynamic_symbol
57 PARAMS ((struct elf_link_hash_entry
*, PTR
));
58 static boolean elf_link_find_version_dependencies
59 PARAMS ((struct elf_link_hash_entry
*, PTR
));
60 static boolean elf_link_assign_sym_version
61 PARAMS ((struct elf_link_hash_entry
*, PTR
));
62 static boolean elf_collect_hash_codes
63 PARAMS ((struct elf_link_hash_entry
*, PTR
));
64 static boolean elf_link_read_relocs_from_section
65 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
66 static size_t compute_bucket_count
67 PARAMS ((struct bfd_link_info
*));
68 static boolean elf_link_output_relocs
69 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
70 static boolean elf_link_size_reloc_section
71 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
72 static void elf_link_adjust_relocs
73 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
74 struct elf_link_hash_entry
**));
75 static int elf_link_sort_cmp1
76 PARAMS ((const void *, const void *));
77 static int elf_link_sort_cmp2
78 PARAMS ((const void *, const void *));
79 static size_t elf_link_sort_relocs
80 PARAMS ((bfd
*, struct bfd_link_info
*, asection
**));
81 static boolean elf_section_ignore_discarded_relocs
82 PARAMS ((asection
*));
84 /* Given an ELF BFD, add symbols to the global hash table as
88 elf_bfd_link_add_symbols (abfd
, info
)
90 struct bfd_link_info
*info
;
92 switch (bfd_get_format (abfd
))
95 return elf_link_add_object_symbols (abfd
, info
);
97 return elf_link_add_archive_symbols (abfd
, info
);
99 bfd_set_error (bfd_error_wrong_format
);
104 /* Return true iff this is a non-common, definition of a non-function symbol. */
106 is_global_data_symbol_definition (abfd
, sym
)
107 bfd
* abfd ATTRIBUTE_UNUSED
;
108 Elf_Internal_Sym
* sym
;
110 /* Local symbols do not count, but target specific ones might. */
111 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
112 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
115 /* Function symbols do not count. */
116 if (ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)
119 /* If the section is undefined, then so is the symbol. */
120 if (sym
->st_shndx
== SHN_UNDEF
)
123 /* If the symbol is defined in the common section, then
124 it is a common definition and so does not count. */
125 if (sym
->st_shndx
== SHN_COMMON
)
128 /* If the symbol is in a target specific section then we
129 must rely upon the backend to tell us what it is. */
130 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
131 /* FIXME - this function is not coded yet:
133 return _bfd_is_global_symbol_definition (abfd, sym);
135 Instead for now assume that the definition is not global,
136 Even if this is wrong, at least the linker will behave
137 in the same way that it used to do. */
143 /* Search the symbol table of the archive element of the archive ABFD
144 whose archive map contains a mention of SYMDEF, and determine if
145 the symbol is defined in this element. */
147 elf_link_is_defined_archive_symbol (abfd
, symdef
)
151 Elf_Internal_Shdr
* hdr
;
152 bfd_size_type symcount
;
153 bfd_size_type extsymcount
;
154 bfd_size_type extsymoff
;
155 Elf_Internal_Sym
*isymbuf
;
156 Elf_Internal_Sym
*isym
;
157 Elf_Internal_Sym
*isymend
;
160 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
161 if (abfd
== (bfd
*) NULL
)
164 if (! bfd_check_format (abfd
, bfd_object
))
167 /* If we have already included the element containing this symbol in the
168 link then we do not need to include it again. Just claim that any symbol
169 it contains is not a definition, so that our caller will not decide to
170 (re)include this element. */
171 if (abfd
->archive_pass
)
174 /* Select the appropriate symbol table. */
175 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
176 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
178 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
180 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
182 /* The sh_info field of the symtab header tells us where the
183 external symbols start. We don't care about the local symbols. */
184 if (elf_bad_symtab (abfd
))
186 extsymcount
= symcount
;
191 extsymcount
= symcount
- hdr
->sh_info
;
192 extsymoff
= hdr
->sh_info
;
195 if (extsymcount
== 0)
198 /* Read in the symbol table. */
199 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
204 /* Scan the symbol table looking for SYMDEF. */
206 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
210 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
212 if (name
== (const char *) NULL
)
215 if (strcmp (name
, symdef
->name
) == 0)
217 result
= is_global_data_symbol_definition (abfd
, isym
);
227 /* Add symbols from an ELF archive file to the linker hash table. We
228 don't use _bfd_generic_link_add_archive_symbols because of a
229 problem which arises on UnixWare. The UnixWare libc.so is an
230 archive which includes an entry libc.so.1 which defines a bunch of
231 symbols. The libc.so archive also includes a number of other
232 object files, which also define symbols, some of which are the same
233 as those defined in libc.so.1. Correct linking requires that we
234 consider each object file in turn, and include it if it defines any
235 symbols we need. _bfd_generic_link_add_archive_symbols does not do
236 this; it looks through the list of undefined symbols, and includes
237 any object file which defines them. When this algorithm is used on
238 UnixWare, it winds up pulling in libc.so.1 early and defining a
239 bunch of symbols. This means that some of the other objects in the
240 archive are not included in the link, which is incorrect since they
241 precede libc.so.1 in the archive.
243 Fortunately, ELF archive handling is simpler than that done by
244 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
245 oddities. In ELF, if we find a symbol in the archive map, and the
246 symbol is currently undefined, we know that we must pull in that
249 Unfortunately, we do have to make multiple passes over the symbol
250 table until nothing further is resolved. */
253 elf_link_add_archive_symbols (abfd
, info
)
255 struct bfd_link_info
*info
;
258 boolean
*defined
= NULL
;
259 boolean
*included
= NULL
;
264 if (! bfd_has_map (abfd
))
266 /* An empty archive is a special case. */
267 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
269 bfd_set_error (bfd_error_no_armap
);
273 /* Keep track of all symbols we know to be already defined, and all
274 files we know to be already included. This is to speed up the
275 second and subsequent passes. */
276 c
= bfd_ardata (abfd
)->symdef_count
;
280 amt
*= sizeof (boolean
);
281 defined
= (boolean
*) bfd_zmalloc (amt
);
282 included
= (boolean
*) bfd_zmalloc (amt
);
283 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
286 symdefs
= bfd_ardata (abfd
)->symdefs
;
299 symdefend
= symdef
+ c
;
300 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
302 struct elf_link_hash_entry
*h
;
304 struct bfd_link_hash_entry
*undefs_tail
;
307 if (defined
[i
] || included
[i
])
309 if (symdef
->file_offset
== last
)
315 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
316 false, false, false);
323 /* If this is a default version (the name contains @@),
324 look up the symbol again with only one `@' as well
325 as without the version. The effect is that references
326 to the symbol with and without the version will be
327 matched by the default symbol in the archive. */
329 p
= strchr (symdef
->name
, ELF_VER_CHR
);
330 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
333 /* First check with only one `@'. */
334 len
= strlen (symdef
->name
);
335 copy
= bfd_alloc (abfd
, (bfd_size_type
) len
);
338 first
= p
- symdef
->name
+ 1;
339 memcpy (copy
, symdef
->name
, first
);
340 memcpy (copy
+ first
, symdef
->name
+ first
+ 1, len
- first
);
342 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
343 false, false, false);
347 /* We also need to check references to the symbol
348 without the version. */
350 copy
[first
- 1] = '\0';
351 h
= elf_link_hash_lookup (elf_hash_table (info
),
352 copy
, false, false, false);
355 bfd_release (abfd
, copy
);
361 if (h
->root
.type
== bfd_link_hash_common
)
363 /* We currently have a common symbol. The archive map contains
364 a reference to this symbol, so we may want to include it. We
365 only want to include it however, if this archive element
366 contains a definition of the symbol, not just another common
369 Unfortunately some archivers (including GNU ar) will put
370 declarations of common symbols into their archive maps, as
371 well as real definitions, so we cannot just go by the archive
372 map alone. Instead we must read in the element's symbol
373 table and check that to see what kind of symbol definition
375 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
378 else if (h
->root
.type
!= bfd_link_hash_undefined
)
380 if (h
->root
.type
!= bfd_link_hash_undefweak
)
385 /* We need to include this archive member. */
386 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
387 if (element
== (bfd
*) NULL
)
390 if (! bfd_check_format (element
, bfd_object
))
393 /* Doublecheck that we have not included this object
394 already--it should be impossible, but there may be
395 something wrong with the archive. */
396 if (element
->archive_pass
!= 0)
398 bfd_set_error (bfd_error_bad_value
);
401 element
->archive_pass
= 1;
403 undefs_tail
= info
->hash
->undefs_tail
;
405 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
408 if (! elf_link_add_object_symbols (element
, info
))
411 /* If there are any new undefined symbols, we need to make
412 another pass through the archive in order to see whether
413 they can be defined. FIXME: This isn't perfect, because
414 common symbols wind up on undefs_tail and because an
415 undefined symbol which is defined later on in this pass
416 does not require another pass. This isn't a bug, but it
417 does make the code less efficient than it could be. */
418 if (undefs_tail
!= info
->hash
->undefs_tail
)
421 /* Look backward to mark all symbols from this object file
422 which we have already seen in this pass. */
426 included
[mark
] = true;
431 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
433 /* We mark subsequent symbols from this object file as we go
434 on through the loop. */
435 last
= symdef
->file_offset
;
446 if (defined
!= (boolean
*) NULL
)
448 if (included
!= (boolean
*) NULL
)
453 /* This function is called when we want to define a new symbol. It
454 handles the various cases which arise when we find a definition in
455 a dynamic object, or when there is already a definition in a
456 dynamic object. The new symbol is described by NAME, SYM, PSEC,
457 and PVALUE. We set SYM_HASH to the hash table entry. We set
458 OVERRIDE if the old symbol is overriding a new definition. We set
459 TYPE_CHANGE_OK if it is OK for the type to change. We set
460 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
461 change, we mean that we shouldn't warn if the type or size does
462 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
466 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
467 override
, type_change_ok
, size_change_ok
, dt_needed
)
469 struct bfd_link_info
*info
;
471 Elf_Internal_Sym
*sym
;
474 struct elf_link_hash_entry
**sym_hash
;
476 boolean
*type_change_ok
;
477 boolean
*size_change_ok
;
481 struct elf_link_hash_entry
*h
;
484 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
489 bind
= ELF_ST_BIND (sym
->st_info
);
491 if (! bfd_is_und_section (sec
))
492 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
494 h
= ((struct elf_link_hash_entry
*)
495 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
500 /* This code is for coping with dynamic objects, and is only useful
501 if we are doing an ELF link. */
502 if (info
->hash
->creator
!= abfd
->xvec
)
505 /* For merging, we only care about real symbols. */
507 while (h
->root
.type
== bfd_link_hash_indirect
508 || h
->root
.type
== bfd_link_hash_warning
)
509 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
511 /* If we just created the symbol, mark it as being an ELF symbol.
512 Other than that, there is nothing to do--there is no merge issue
513 with a newly defined symbol--so we just return. */
515 if (h
->root
.type
== bfd_link_hash_new
)
517 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
521 /* OLDBFD is a BFD associated with the existing symbol. */
523 switch (h
->root
.type
)
529 case bfd_link_hash_undefined
:
530 case bfd_link_hash_undefweak
:
531 oldbfd
= h
->root
.u
.undef
.abfd
;
534 case bfd_link_hash_defined
:
535 case bfd_link_hash_defweak
:
536 oldbfd
= h
->root
.u
.def
.section
->owner
;
539 case bfd_link_hash_common
:
540 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
544 /* In cases involving weak versioned symbols, we may wind up trying
545 to merge a symbol with itself. Catch that here, to avoid the
546 confusion that results if we try to override a symbol with
547 itself. The additional tests catch cases like
548 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
549 dynamic object, which we do want to handle here. */
551 && ((abfd
->flags
& DYNAMIC
) == 0
552 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
555 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
556 respectively, is from a dynamic object. */
558 if ((abfd
->flags
& DYNAMIC
) != 0)
564 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
569 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
570 indices used by MIPS ELF. */
571 switch (h
->root
.type
)
577 case bfd_link_hash_defined
:
578 case bfd_link_hash_defweak
:
579 hsec
= h
->root
.u
.def
.section
;
582 case bfd_link_hash_common
:
583 hsec
= h
->root
.u
.c
.p
->section
;
590 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
593 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
594 respectively, appear to be a definition rather than reference. */
596 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
601 if (h
->root
.type
== bfd_link_hash_undefined
602 || h
->root
.type
== bfd_link_hash_undefweak
603 || h
->root
.type
== bfd_link_hash_common
)
608 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
609 symbol, respectively, appears to be a common symbol in a dynamic
610 object. If a symbol appears in an uninitialized section, and is
611 not weak, and is not a function, then it may be a common symbol
612 which was resolved when the dynamic object was created. We want
613 to treat such symbols specially, because they raise special
614 considerations when setting the symbol size: if the symbol
615 appears as a common symbol in a regular object, and the size in
616 the regular object is larger, we must make sure that we use the
617 larger size. This problematic case can always be avoided in C,
618 but it must be handled correctly when using Fortran shared
621 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
622 likewise for OLDDYNCOMMON and OLDDEF.
624 Note that this test is just a heuristic, and that it is quite
625 possible to have an uninitialized symbol in a shared object which
626 is really a definition, rather than a common symbol. This could
627 lead to some minor confusion when the symbol really is a common
628 symbol in some regular object. However, I think it will be
633 && (sec
->flags
& SEC_ALLOC
) != 0
634 && (sec
->flags
& SEC_LOAD
) == 0
637 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
640 newdyncommon
= false;
644 && h
->root
.type
== bfd_link_hash_defined
645 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
646 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
647 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
649 && h
->type
!= STT_FUNC
)
652 olddyncommon
= false;
654 /* It's OK to change the type if either the existing symbol or the
655 new symbol is weak unless it comes from a DT_NEEDED entry of
656 a shared object, in which case, the DT_NEEDED entry may not be
657 required at the run time. */
659 if ((! dt_needed
&& h
->root
.type
== bfd_link_hash_defweak
)
660 || h
->root
.type
== bfd_link_hash_undefweak
662 *type_change_ok
= true;
664 /* It's OK to change the size if either the existing symbol or the
665 new symbol is weak, or if the old symbol is undefined. */
668 || h
->root
.type
== bfd_link_hash_undefined
)
669 *size_change_ok
= true;
671 /* If both the old and the new symbols look like common symbols in a
672 dynamic object, set the size of the symbol to the larger of the
677 && sym
->st_size
!= h
->size
)
679 /* Since we think we have two common symbols, issue a multiple
680 common warning if desired. Note that we only warn if the
681 size is different. If the size is the same, we simply let
682 the old symbol override the new one as normally happens with
683 symbols defined in dynamic objects. */
685 if (! ((*info
->callbacks
->multiple_common
)
686 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
687 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
690 if (sym
->st_size
> h
->size
)
691 h
->size
= sym
->st_size
;
693 *size_change_ok
= true;
696 /* If we are looking at a dynamic object, and we have found a
697 definition, we need to see if the symbol was already defined by
698 some other object. If so, we want to use the existing
699 definition, and we do not want to report a multiple symbol
700 definition error; we do this by clobbering *PSEC to be
703 We treat a common symbol as a definition if the symbol in the
704 shared library is a function, since common symbols always
705 represent variables; this can cause confusion in principle, but
706 any such confusion would seem to indicate an erroneous program or
707 shared library. We also permit a common symbol in a regular
708 object to override a weak symbol in a shared object.
710 We prefer a non-weak definition in a shared library to a weak
711 definition in the executable unless it comes from a DT_NEEDED
712 entry of a shared object, in which case, the DT_NEEDED entry
713 may not be required at the run time. */
718 || (h
->root
.type
== bfd_link_hash_common
720 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
721 && (h
->root
.type
!= bfd_link_hash_defweak
723 || bind
== STB_WEAK
))
727 newdyncommon
= false;
729 *psec
= sec
= bfd_und_section_ptr
;
730 *size_change_ok
= true;
732 /* If we get here when the old symbol is a common symbol, then
733 we are explicitly letting it override a weak symbol or
734 function in a dynamic object, and we don't want to warn about
735 a type change. If the old symbol is a defined symbol, a type
736 change warning may still be appropriate. */
738 if (h
->root
.type
== bfd_link_hash_common
)
739 *type_change_ok
= true;
742 /* Handle the special case of an old common symbol merging with a
743 new symbol which looks like a common symbol in a shared object.
744 We change *PSEC and *PVALUE to make the new symbol look like a
745 common symbol, and let _bfd_generic_link_add_one_symbol will do
749 && h
->root
.type
== bfd_link_hash_common
)
753 newdyncommon
= false;
754 *pvalue
= sym
->st_size
;
755 *psec
= sec
= bfd_com_section_ptr
;
756 *size_change_ok
= true;
759 /* If the old symbol is from a dynamic object, and the new symbol is
760 a definition which is not from a dynamic object, then the new
761 symbol overrides the old symbol. Symbols from regular files
762 always take precedence over symbols from dynamic objects, even if
763 they are defined after the dynamic object in the link.
765 As above, we again permit a common symbol in a regular object to
766 override a definition in a shared object if the shared object
767 symbol is a function or is weak.
769 As above, we permit a non-weak definition in a shared object to
770 override a weak definition in a regular object. */
774 || (bfd_is_com_section (sec
)
775 && (h
->root
.type
== bfd_link_hash_defweak
776 || h
->type
== STT_FUNC
)))
779 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
781 || h
->root
.type
== bfd_link_hash_defweak
))
783 /* Change the hash table entry to undefined, and let
784 _bfd_generic_link_add_one_symbol do the right thing with the
787 h
->root
.type
= bfd_link_hash_undefined
;
788 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
789 *size_change_ok
= true;
792 olddyncommon
= false;
794 /* We again permit a type change when a common symbol may be
795 overriding a function. */
797 if (bfd_is_com_section (sec
))
798 *type_change_ok
= true;
800 /* This union may have been set to be non-NULL when this symbol
801 was seen in a dynamic object. We must force the union to be
802 NULL, so that it is correct for a regular symbol. */
804 h
->verinfo
.vertree
= NULL
;
806 /* In this special case, if H is the target of an indirection,
807 we want the caller to frob with H rather than with the
808 indirect symbol. That will permit the caller to redefine the
809 target of the indirection, rather than the indirect symbol
810 itself. FIXME: This will break the -y option if we store a
811 symbol with a different name. */
815 /* Handle the special case of a new common symbol merging with an
816 old symbol that looks like it might be a common symbol defined in
817 a shared object. Note that we have already handled the case in
818 which a new common symbol should simply override the definition
819 in the shared library. */
822 && bfd_is_com_section (sec
)
825 /* It would be best if we could set the hash table entry to a
826 common symbol, but we don't know what to use for the section
828 if (! ((*info
->callbacks
->multiple_common
)
829 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
830 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
833 /* If the predumed common symbol in the dynamic object is
834 larger, pretend that the new symbol has its size. */
836 if (h
->size
> *pvalue
)
839 /* FIXME: We no longer know the alignment required by the symbol
840 in the dynamic object, so we just wind up using the one from
841 the regular object. */
844 olddyncommon
= false;
846 h
->root
.type
= bfd_link_hash_undefined
;
847 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
849 *size_change_ok
= true;
850 *type_change_ok
= true;
852 h
->verinfo
.vertree
= NULL
;
855 /* Handle the special case of a weak definition in a regular object
856 followed by a non-weak definition in a shared object. In this
857 case, we prefer the definition in the shared object unless it
858 comes from a DT_NEEDED entry of a shared object, in which case,
859 the DT_NEEDED entry may not be required at the run time. */
862 && h
->root
.type
== bfd_link_hash_defweak
867 /* To make this work we have to frob the flags so that the rest
868 of the code does not think we are using the regular
870 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
871 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
872 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
873 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
874 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
875 | ELF_LINK_HASH_DEF_DYNAMIC
);
877 /* If H is the target of an indirection, we want the caller to
878 use H rather than the indirect symbol. Otherwise if we are
879 defining a new indirect symbol we will wind up attaching it
880 to the entry we are overriding. */
884 /* Handle the special case of a non-weak definition in a shared
885 object followed by a weak definition in a regular object. In
886 this case we prefer to definition in the shared object. To make
887 this work we have to tell the caller to not treat the new symbol
891 && h
->root
.type
!= bfd_link_hash_defweak
900 /* This function is called to create an indirect symbol from the
901 default for the symbol with the default version if needed. The
902 symbol is described by H, NAME, SYM, SEC, VALUE, and OVERRIDE. We
903 set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED
904 indicates if it comes from a DT_NEEDED entry of a shared object. */
907 elf_add_default_symbol (abfd
, info
, h
, name
, sym
, sec
, value
,
908 dynsym
, override
, dt_needed
)
910 struct bfd_link_info
*info
;
911 struct elf_link_hash_entry
*h
;
913 Elf_Internal_Sym
*sym
;
920 boolean type_change_ok
;
921 boolean size_change_ok
;
923 struct elf_link_hash_entry
*hi
;
924 struct elf_backend_data
*bed
;
928 size_t len
, shortlen
;
930 /* If this symbol has a version, and it is the default version, we
931 create an indirect symbol from the default name to the fully
932 decorated name. This will cause external references which do not
933 specify a version to be bound to this version of the symbol. */
934 p
= strchr (name
, ELF_VER_CHR
);
935 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
940 /* We are overridden by an old defition. We need to check if we
941 need to create the indirect symbol from the default name. */
942 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, true,
944 BFD_ASSERT (hi
!= NULL
);
947 while (hi
->root
.type
== bfd_link_hash_indirect
948 || hi
->root
.type
== bfd_link_hash_warning
)
950 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
956 bed
= get_elf_backend_data (abfd
);
957 collect
= bed
->collect
;
958 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
961 shortname
= bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
962 if (shortname
== NULL
)
964 memcpy (shortname
, name
, shortlen
);
965 shortname
[shortlen
] = '\0';
967 /* We are going to create a new symbol. Merge it with any existing
968 symbol with this name. For the purposes of the merge, act as
969 though we were defining the symbol we just defined, although we
970 actually going to define an indirect symbol. */
971 type_change_ok
= false;
972 size_change_ok
= false;
973 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, sec
, value
,
974 &hi
, &override
, &type_change_ok
,
975 &size_change_ok
, dt_needed
))
980 if (! (_bfd_generic_link_add_one_symbol
981 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
982 (bfd_vma
) 0, name
, false, collect
,
983 (struct bfd_link_hash_entry
**) &hi
)))
988 /* In this case the symbol named SHORTNAME is overriding the
989 indirect symbol we want to add. We were planning on making
990 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
991 is the name without a version. NAME is the fully versioned
992 name, and it is the default version.
994 Overriding means that we already saw a definition for the
995 symbol SHORTNAME in a regular object, and it is overriding
996 the symbol defined in the dynamic object.
998 When this happens, we actually want to change NAME, the
999 symbol we just added, to refer to SHORTNAME. This will cause
1000 references to NAME in the shared object to become references
1001 to SHORTNAME in the regular object. This is what we expect
1002 when we override a function in a shared object: that the
1003 references in the shared object will be mapped to the
1004 definition in the regular object. */
1006 while (hi
->root
.type
== bfd_link_hash_indirect
1007 || hi
->root
.type
== bfd_link_hash_warning
)
1008 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1010 h
->root
.type
= bfd_link_hash_indirect
;
1011 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1012 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1014 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1015 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1016 if (hi
->elf_link_hash_flags
1017 & (ELF_LINK_HASH_REF_REGULAR
1018 | ELF_LINK_HASH_DEF_REGULAR
))
1020 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1025 /* Now set HI to H, so that the following code will set the
1026 other fields correctly. */
1030 /* If there is a duplicate definition somewhere, then HI may not
1031 point to an indirect symbol. We will have reported an error to
1032 the user in that case. */
1034 if (hi
->root
.type
== bfd_link_hash_indirect
)
1036 struct elf_link_hash_entry
*ht
;
1038 /* If the symbol became indirect, then we assume that we have
1039 not seen a definition before. */
1040 BFD_ASSERT ((hi
->elf_link_hash_flags
1041 & (ELF_LINK_HASH_DEF_DYNAMIC
1042 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1044 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1045 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1047 /* See if the new flags lead us to realize that the symbol must
1054 || ((hi
->elf_link_hash_flags
1055 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1060 if ((hi
->elf_link_hash_flags
1061 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1067 /* We also need to define an indirection from the nondefault version
1070 len
= strlen (name
);
1071 shortname
= bfd_hash_allocate (&info
->hash
->table
, len
);
1072 if (shortname
== NULL
)
1074 memcpy (shortname
, name
, shortlen
);
1075 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1077 /* Once again, merge with any existing symbol. */
1078 type_change_ok
= false;
1079 size_change_ok
= false;
1080 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, sec
, value
,
1081 &hi
, &override
, &type_change_ok
,
1082 &size_change_ok
, dt_needed
))
1087 /* Here SHORTNAME is a versioned name, so we don't expect to see
1088 the type of override we do in the case above. */
1089 (*_bfd_error_handler
)
1090 (_("%s: warning: unexpected redefinition of `%s'"),
1091 bfd_archive_filename (abfd
), shortname
);
1095 if (! (_bfd_generic_link_add_one_symbol
1096 (info
, abfd
, shortname
, BSF_INDIRECT
,
1097 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1098 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1101 /* If there is a duplicate definition somewhere, then HI may not
1102 point to an indirect symbol. We will have reported an error
1103 to the user in that case. */
1105 if (hi
->root
.type
== bfd_link_hash_indirect
)
1107 /* If the symbol became indirect, then we assume that we have
1108 not seen a definition before. */
1109 BFD_ASSERT ((hi
->elf_link_hash_flags
1110 & (ELF_LINK_HASH_DEF_DYNAMIC
1111 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1113 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1115 /* See if the new flags lead us to realize that the symbol
1122 || ((hi
->elf_link_hash_flags
1123 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1128 if ((hi
->elf_link_hash_flags
1129 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1139 /* Add symbols from an ELF object file to the linker hash table. */
1142 elf_link_add_object_symbols (abfd
, info
)
1144 struct bfd_link_info
*info
;
1146 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
1147 const Elf_Internal_Sym
*,
1148 const char **, flagword
*,
1149 asection
**, bfd_vma
*));
1150 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
1151 asection
*, const Elf_Internal_Rela
*));
1153 Elf_Internal_Shdr
*hdr
;
1154 bfd_size_type symcount
;
1155 bfd_size_type extsymcount
;
1156 bfd_size_type extsymoff
;
1157 struct elf_link_hash_entry
**sym_hash
;
1159 Elf_External_Versym
*extversym
= NULL
;
1160 Elf_External_Versym
*ever
;
1161 struct elf_link_hash_entry
*weaks
;
1162 Elf_Internal_Sym
*isymbuf
= NULL
;
1163 Elf_Internal_Sym
*isym
;
1164 Elf_Internal_Sym
*isymend
;
1165 struct elf_backend_data
*bed
;
1167 struct elf_link_hash_table
* hash_table
;
1170 hash_table
= elf_hash_table (info
);
1172 bed
= get_elf_backend_data (abfd
);
1173 add_symbol_hook
= bed
->elf_add_symbol_hook
;
1174 collect
= bed
->collect
;
1176 if ((abfd
->flags
& DYNAMIC
) == 0)
1182 /* You can't use -r against a dynamic object. Also, there's no
1183 hope of using a dynamic object which does not exactly match
1184 the format of the output file. */
1185 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
1187 bfd_set_error (bfd_error_invalid_operation
);
1192 /* As a GNU extension, any input sections which are named
1193 .gnu.warning.SYMBOL are treated as warning symbols for the given
1194 symbol. This differs from .gnu.warning sections, which generate
1195 warnings when they are included in an output file. */
1200 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1204 name
= bfd_get_section_name (abfd
, s
);
1205 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1210 name
+= sizeof ".gnu.warning." - 1;
1212 /* If this is a shared object, then look up the symbol
1213 in the hash table. If it is there, and it is already
1214 been defined, then we will not be using the entry
1215 from this shared object, so we don't need to warn.
1216 FIXME: If we see the definition in a regular object
1217 later on, we will warn, but we shouldn't. The only
1218 fix is to keep track of what warnings we are supposed
1219 to emit, and then handle them all at the end of the
1221 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
1223 struct elf_link_hash_entry
*h
;
1225 h
= elf_link_hash_lookup (hash_table
, name
,
1226 false, false, true);
1228 /* FIXME: What about bfd_link_hash_common? */
1230 && (h
->root
.type
== bfd_link_hash_defined
1231 || h
->root
.type
== bfd_link_hash_defweak
))
1233 /* We don't want to issue this warning. Clobber
1234 the section size so that the warning does not
1235 get copied into the output file. */
1241 sz
= bfd_section_size (abfd
, s
);
1242 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
1246 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
1251 if (! (_bfd_generic_link_add_one_symbol
1252 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
1253 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
1256 if (! info
->relocateable
)
1258 /* Clobber the section size so that the warning does
1259 not get copied into the output file. */
1269 /* If we are creating a shared library, create all the dynamic
1270 sections immediately. We need to attach them to something,
1271 so we attach them to this BFD, provided it is the right
1272 format. FIXME: If there are no input BFD's of the same
1273 format as the output, we can't make a shared library. */
1275 && is_elf_hash_table (info
)
1276 && ! hash_table
->dynamic_sections_created
1277 && abfd
->xvec
== info
->hash
->creator
)
1279 if (! elf_link_create_dynamic_sections (abfd
, info
))
1283 else if (! is_elf_hash_table (info
))
1290 bfd_size_type oldsize
;
1291 bfd_size_type strindex
;
1293 /* Find the name to use in a DT_NEEDED entry that refers to this
1294 object. If the object has a DT_SONAME entry, we use it.
1295 Otherwise, if the generic linker stuck something in
1296 elf_dt_name, we use that. Otherwise, we just use the file
1297 name. If the generic linker put a null string into
1298 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1299 there is a DT_SONAME entry. */
1301 name
= bfd_get_filename (abfd
);
1302 if (elf_dt_name (abfd
) != NULL
)
1304 name
= elf_dt_name (abfd
);
1307 if (elf_dt_soname (abfd
) != NULL
)
1313 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1316 Elf_External_Dyn
*dynbuf
= NULL
;
1317 Elf_External_Dyn
*extdyn
;
1318 Elf_External_Dyn
*extdynend
;
1320 unsigned long shlink
;
1324 dynbuf
= (Elf_External_Dyn
*) bfd_malloc (s
->_raw_size
);
1328 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1329 (file_ptr
) 0, s
->_raw_size
))
1330 goto error_free_dyn
;
1332 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1334 goto error_free_dyn
;
1335 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1338 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1341 for (; extdyn
< extdynend
; extdyn
++)
1343 Elf_Internal_Dyn dyn
;
1345 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1346 if (dyn
.d_tag
== DT_SONAME
)
1348 unsigned int tagv
= dyn
.d_un
.d_val
;
1349 name
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1351 goto error_free_dyn
;
1353 if (dyn
.d_tag
== DT_NEEDED
)
1355 struct bfd_link_needed_list
*n
, **pn
;
1357 unsigned int tagv
= dyn
.d_un
.d_val
;
1359 amt
= sizeof (struct bfd_link_needed_list
);
1360 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1361 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1362 if (n
== NULL
|| fnm
== NULL
)
1363 goto error_free_dyn
;
1364 amt
= strlen (fnm
) + 1;
1365 anm
= bfd_alloc (abfd
, amt
);
1367 goto error_free_dyn
;
1368 memcpy (anm
, fnm
, (size_t) amt
);
1372 for (pn
= & hash_table
->needed
;
1378 if (dyn
.d_tag
== DT_RUNPATH
)
1380 struct bfd_link_needed_list
*n
, **pn
;
1382 unsigned int tagv
= dyn
.d_un
.d_val
;
1384 /* When we see DT_RPATH before DT_RUNPATH, we have
1385 to clear runpath. Do _NOT_ bfd_release, as that
1386 frees all more recently bfd_alloc'd blocks as
1388 if (rpath
&& hash_table
->runpath
)
1389 hash_table
->runpath
= NULL
;
1391 amt
= sizeof (struct bfd_link_needed_list
);
1392 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1393 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1394 if (n
== NULL
|| fnm
== NULL
)
1395 goto error_free_dyn
;
1396 amt
= strlen (fnm
) + 1;
1397 anm
= bfd_alloc (abfd
, amt
);
1399 goto error_free_dyn
;
1400 memcpy (anm
, fnm
, (size_t) amt
);
1404 for (pn
= & hash_table
->runpath
;
1412 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1413 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
1415 struct bfd_link_needed_list
*n
, **pn
;
1417 unsigned int tagv
= dyn
.d_un
.d_val
;
1419 amt
= sizeof (struct bfd_link_needed_list
);
1420 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1421 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1422 if (n
== NULL
|| fnm
== NULL
)
1423 goto error_free_dyn
;
1424 amt
= strlen (fnm
) + 1;
1425 anm
= bfd_alloc (abfd
, amt
);
1432 memcpy (anm
, fnm
, (size_t) amt
);
1436 for (pn
= & hash_table
->runpath
;
1448 /* We do not want to include any of the sections in a dynamic
1449 object in the output file. We hack by simply clobbering the
1450 list of sections in the BFD. This could be handled more
1451 cleanly by, say, a new section flag; the existing
1452 SEC_NEVER_LOAD flag is not the one we want, because that one
1453 still implies that the section takes up space in the output
1455 bfd_section_list_clear (abfd
);
1457 /* If this is the first dynamic object found in the link, create
1458 the special sections required for dynamic linking. */
1459 if (! hash_table
->dynamic_sections_created
)
1460 if (! elf_link_create_dynamic_sections (abfd
, info
))
1465 /* Add a DT_NEEDED entry for this dynamic object. */
1466 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
1467 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, name
, false);
1468 if (strindex
== (bfd_size_type
) -1)
1471 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
1474 Elf_External_Dyn
*dyncon
, *dynconend
;
1476 /* The hash table size did not change, which means that
1477 the dynamic object name was already entered. If we
1478 have already included this dynamic object in the
1479 link, just ignore it. There is no reason to include
1480 a particular dynamic object more than once. */
1481 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
1482 BFD_ASSERT (sdyn
!= NULL
);
1484 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1485 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1487 for (; dyncon
< dynconend
; dyncon
++)
1489 Elf_Internal_Dyn dyn
;
1491 elf_swap_dyn_in (hash_table
->dynobj
, dyncon
, & dyn
);
1492 if (dyn
.d_tag
== DT_NEEDED
1493 && dyn
.d_un
.d_val
== strindex
)
1495 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
1501 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
1505 /* Save the SONAME, if there is one, because sometimes the
1506 linker emulation code will need to know it. */
1508 name
= basename (bfd_get_filename (abfd
));
1509 elf_dt_name (abfd
) = name
;
1512 /* If this is a dynamic object, we always link against the .dynsym
1513 symbol table, not the .symtab symbol table. The dynamic linker
1514 will only see the .dynsym symbol table, so there is no reason to
1515 look at .symtab for a dynamic object. */
1517 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
1518 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1520 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1522 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1524 /* The sh_info field of the symtab header tells us where the
1525 external symbols start. We don't care about the local symbols at
1527 if (elf_bad_symtab (abfd
))
1529 extsymcount
= symcount
;
1534 extsymcount
= symcount
- hdr
->sh_info
;
1535 extsymoff
= hdr
->sh_info
;
1539 if (extsymcount
!= 0)
1541 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
1543 if (isymbuf
== NULL
)
1546 /* We store a pointer to the hash table entry for each external
1548 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
1549 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
1550 if (sym_hash
== NULL
)
1551 goto error_free_sym
;
1552 elf_sym_hashes (abfd
) = sym_hash
;
1557 /* Read in any version definitions. */
1558 if (! _bfd_elf_slurp_version_tables (abfd
))
1559 goto error_free_sym
;
1561 /* Read in the symbol versions, but don't bother to convert them
1562 to internal format. */
1563 if (elf_dynversym (abfd
) != 0)
1565 Elf_Internal_Shdr
*versymhdr
;
1567 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1568 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
1569 if (extversym
== NULL
)
1570 goto error_free_sym
;
1571 amt
= versymhdr
->sh_size
;
1572 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1573 || bfd_bread ((PTR
) extversym
, amt
, abfd
) != amt
)
1574 goto error_free_vers
;
1580 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1581 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
1583 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1590 struct elf_link_hash_entry
*h
;
1592 boolean size_change_ok
, type_change_ok
;
1593 boolean new_weakdef
;
1594 unsigned int old_alignment
;
1599 flags
= BSF_NO_FLAGS
;
1601 value
= isym
->st_value
;
1604 bind
= ELF_ST_BIND (isym
->st_info
);
1605 if (bind
== STB_LOCAL
)
1607 /* This should be impossible, since ELF requires that all
1608 global symbols follow all local symbols, and that sh_info
1609 point to the first global symbol. Unfortunatealy, Irix 5
1613 else if (bind
== STB_GLOBAL
)
1615 if (isym
->st_shndx
!= SHN_UNDEF
1616 && isym
->st_shndx
!= SHN_COMMON
)
1619 else if (bind
== STB_WEAK
)
1623 /* Leave it up to the processor backend. */
1626 if (isym
->st_shndx
== SHN_UNDEF
)
1627 sec
= bfd_und_section_ptr
;
1628 else if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
1630 sec
= section_from_elf_index (abfd
, isym
->st_shndx
);
1632 sec
= bfd_abs_section_ptr
;
1633 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1636 else if (isym
->st_shndx
== SHN_ABS
)
1637 sec
= bfd_abs_section_ptr
;
1638 else if (isym
->st_shndx
== SHN_COMMON
)
1640 sec
= bfd_com_section_ptr
;
1641 /* What ELF calls the size we call the value. What ELF
1642 calls the value we call the alignment. */
1643 value
= isym
->st_size
;
1647 /* Leave it up to the processor backend. */
1650 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
1652 if (name
== (const char *) NULL
)
1653 goto error_free_vers
;
1655 if (isym
->st_shndx
== SHN_COMMON
1656 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
)
1658 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
1662 tcomm
= bfd_make_section (abfd
, ".tcommon");
1664 || !bfd_set_section_flags (abfd
, tcomm
, (SEC_ALLOC
1666 | SEC_LINKER_CREATED
1667 | SEC_THREAD_LOCAL
)))
1668 goto error_free_vers
;
1672 else if (add_symbol_hook
)
1674 if (! (*add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
, &sec
,
1676 goto error_free_vers
;
1678 /* The hook function sets the name to NULL if this symbol
1679 should be skipped for some reason. */
1680 if (name
== (const char *) NULL
)
1684 /* Sanity check that all possibilities were handled. */
1685 if (sec
== (asection
*) NULL
)
1687 bfd_set_error (bfd_error_bad_value
);
1688 goto error_free_vers
;
1691 if (bfd_is_und_section (sec
)
1692 || bfd_is_com_section (sec
))
1697 size_change_ok
= false;
1698 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1700 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1702 Elf_Internal_Versym iver
;
1703 unsigned int vernum
= 0;
1707 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1708 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1710 /* If this is a hidden symbol, or if it is not version
1711 1, we append the version name to the symbol name.
1712 However, we do not modify a non-hidden absolute
1713 symbol, because it might be the version symbol
1714 itself. FIXME: What if it isn't? */
1715 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1716 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1719 size_t namelen
, verlen
, newlen
;
1722 if (isym
->st_shndx
!= SHN_UNDEF
)
1724 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1726 (*_bfd_error_handler
)
1727 (_("%s: %s: invalid version %u (max %d)"),
1728 bfd_archive_filename (abfd
), name
, vernum
,
1729 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1730 bfd_set_error (bfd_error_bad_value
);
1731 goto error_free_vers
;
1733 else if (vernum
> 1)
1735 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1741 /* We cannot simply test for the number of
1742 entries in the VERNEED section since the
1743 numbers for the needed versions do not start
1745 Elf_Internal_Verneed
*t
;
1748 for (t
= elf_tdata (abfd
)->verref
;
1752 Elf_Internal_Vernaux
*a
;
1754 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1756 if (a
->vna_other
== vernum
)
1758 verstr
= a
->vna_nodename
;
1767 (*_bfd_error_handler
)
1768 (_("%s: %s: invalid needed version %d"),
1769 bfd_archive_filename (abfd
), name
, vernum
);
1770 bfd_set_error (bfd_error_bad_value
);
1771 goto error_free_vers
;
1775 namelen
= strlen (name
);
1776 verlen
= strlen (verstr
);
1777 newlen
= namelen
+ verlen
+ 2;
1778 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1779 && isym
->st_shndx
!= SHN_UNDEF
)
1782 newname
= (char *) bfd_alloc (abfd
, (bfd_size_type
) newlen
);
1783 if (newname
== NULL
)
1784 goto error_free_vers
;
1785 memcpy (newname
, name
, namelen
);
1786 p
= newname
+ namelen
;
1788 /* If this is a defined non-hidden version symbol,
1789 we add another @ to the name. This indicates the
1790 default version of the symbol. */
1791 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1792 && isym
->st_shndx
!= SHN_UNDEF
)
1794 memcpy (p
, verstr
, verlen
+ 1);
1800 if (! elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
1801 sym_hash
, &override
, &type_change_ok
,
1802 &size_change_ok
, dt_needed
))
1803 goto error_free_vers
;
1809 while (h
->root
.type
== bfd_link_hash_indirect
1810 || h
->root
.type
== bfd_link_hash_warning
)
1811 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1813 /* Remember the old alignment if this is a common symbol, so
1814 that we don't reduce the alignment later on. We can't
1815 check later, because _bfd_generic_link_add_one_symbol
1816 will set a default for the alignment which we want to
1818 if (h
->root
.type
== bfd_link_hash_common
)
1819 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1821 if (elf_tdata (abfd
)->verdef
!= NULL
1825 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1828 if (! (_bfd_generic_link_add_one_symbol
1829 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1830 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1831 goto error_free_vers
;
1834 while (h
->root
.type
== bfd_link_hash_indirect
1835 || h
->root
.type
== bfd_link_hash_warning
)
1836 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1839 new_weakdef
= false;
1842 && (flags
& BSF_WEAK
) != 0
1843 && ELF_ST_TYPE (isym
->st_info
) != STT_FUNC
1844 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1845 && h
->weakdef
== NULL
)
1847 /* Keep a list of all weak defined non function symbols from
1848 a dynamic object, using the weakdef field. Later in this
1849 function we will set the weakdef field to the correct
1850 value. We only put non-function symbols from dynamic
1851 objects on this list, because that happens to be the only
1852 time we need to know the normal symbol corresponding to a
1853 weak symbol, and the information is time consuming to
1854 figure out. If the weakdef field is not already NULL,
1855 then this symbol was already defined by some previous
1856 dynamic object, and we will be using that previous
1857 definition anyhow. */
1864 /* Set the alignment of a common symbol. */
1865 if (isym
->st_shndx
== SHN_COMMON
1866 && h
->root
.type
== bfd_link_hash_common
)
1870 align
= bfd_log2 (isym
->st_value
);
1871 if (align
> old_alignment
1872 /* Permit an alignment power of zero if an alignment of one
1873 is specified and no other alignments have been specified. */
1874 || (isym
->st_value
== 1 && old_alignment
== 0))
1875 h
->root
.u
.c
.p
->alignment_power
= align
;
1878 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1884 /* Remember the symbol size and type. */
1885 if (isym
->st_size
!= 0
1886 && (definition
|| h
->size
== 0))
1888 if (h
->size
!= 0 && h
->size
!= isym
->st_size
&& ! size_change_ok
)
1889 (*_bfd_error_handler
)
1890 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1891 name
, (unsigned long) h
->size
,
1892 (unsigned long) isym
->st_size
, bfd_archive_filename (abfd
));
1894 h
->size
= isym
->st_size
;
1897 /* If this is a common symbol, then we always want H->SIZE
1898 to be the size of the common symbol. The code just above
1899 won't fix the size if a common symbol becomes larger. We
1900 don't warn about a size change here, because that is
1901 covered by --warn-common. */
1902 if (h
->root
.type
== bfd_link_hash_common
)
1903 h
->size
= h
->root
.u
.c
.size
;
1905 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
1906 && (definition
|| h
->type
== STT_NOTYPE
))
1908 if (h
->type
!= STT_NOTYPE
1909 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
1910 && ! type_change_ok
)
1911 (*_bfd_error_handler
)
1912 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1913 name
, h
->type
, ELF_ST_TYPE (isym
->st_info
),
1914 bfd_archive_filename (abfd
));
1916 h
->type
= ELF_ST_TYPE (isym
->st_info
);
1919 /* If st_other has a processor-specific meaning, specific code
1920 might be needed here. */
1921 if (isym
->st_other
!= 0)
1923 /* Combine visibilities, using the most constraining one. */
1924 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1925 unsigned char symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
1927 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1928 h
->other
= isym
->st_other
;
1930 /* If neither has visibility, use the st_other of the
1931 definition. This is an arbitrary choice, since the
1932 other bits have no general meaning. */
1933 if (!symvis
&& !hvis
1934 && (definition
|| h
->other
== 0))
1935 h
->other
= isym
->st_other
;
1938 /* Set a flag in the hash table entry indicating the type of
1939 reference or definition we just found. Keep a count of
1940 the number of dynamic symbols we find. A dynamic symbol
1941 is one which is referenced or defined by both a regular
1942 object and a shared object. */
1943 old_flags
= h
->elf_link_hash_flags
;
1949 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1950 if (bind
!= STB_WEAK
)
1951 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1954 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1956 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1957 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1963 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1965 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1966 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1967 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1968 || (h
->weakdef
!= NULL
1970 && h
->weakdef
->dynindx
!= -1))
1974 h
->elf_link_hash_flags
|= new_flag
;
1976 /* Check to see if we need to add an indirect symbol for
1977 the default name. */
1978 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
1979 if (! elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
1980 &sec
, &value
, &dynsym
,
1981 override
, dt_needed
))
1982 goto error_free_vers
;
1984 if (dynsym
&& h
->dynindx
== -1)
1986 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1987 goto error_free_vers
;
1988 if (h
->weakdef
!= NULL
1990 && h
->weakdef
->dynindx
== -1)
1992 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1993 goto error_free_vers
;
1996 else if (dynsym
&& h
->dynindx
!= -1)
1997 /* If the symbol already has a dynamic index, but
1998 visibility says it should not be visible, turn it into
2000 switch (ELF_ST_VISIBILITY (h
->other
))
2004 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2008 if (dt_needed
&& definition
2009 && (h
->elf_link_hash_flags
2010 & ELF_LINK_HASH_REF_REGULAR
) != 0)
2012 bfd_size_type oldsize
;
2013 bfd_size_type strindex
;
2015 if (! is_elf_hash_table (info
))
2016 goto error_free_vers
;
2018 /* The symbol from a DT_NEEDED object is referenced from
2019 the regular object to create a dynamic executable. We
2020 have to make sure there is a DT_NEEDED entry for it. */
2023 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
2024 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
,
2025 elf_dt_soname (abfd
), false);
2026 if (strindex
== (bfd_size_type
) -1)
2027 goto error_free_vers
;
2029 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
2032 Elf_External_Dyn
*dyncon
, *dynconend
;
2034 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
,
2036 BFD_ASSERT (sdyn
!= NULL
);
2038 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
2039 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
2041 for (; dyncon
< dynconend
; dyncon
++)
2043 Elf_Internal_Dyn dyn
;
2045 elf_swap_dyn_in (hash_table
->dynobj
,
2047 BFD_ASSERT (dyn
.d_tag
!= DT_NEEDED
||
2048 dyn
.d_un
.d_val
!= strindex
);
2052 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
2053 goto error_free_vers
;
2058 if (extversym
!= NULL
)
2064 if (isymbuf
!= NULL
)
2068 /* Now set the weakdefs field correctly for all the weak defined
2069 symbols we found. The only way to do this is to search all the
2070 symbols. Since we only need the information for non functions in
2071 dynamic objects, that's the only time we actually put anything on
2072 the list WEAKS. We need this information so that if a regular
2073 object refers to a symbol defined weakly in a dynamic object, the
2074 real symbol in the dynamic object is also put in the dynamic
2075 symbols; we also must arrange for both symbols to point to the
2076 same memory location. We could handle the general case of symbol
2077 aliasing, but a general symbol alias can only be generated in
2078 assembler code, handling it correctly would be very time
2079 consuming, and other ELF linkers don't handle general aliasing
2081 while (weaks
!= NULL
)
2083 struct elf_link_hash_entry
*hlook
;
2086 struct elf_link_hash_entry
**hpp
;
2087 struct elf_link_hash_entry
**hppend
;
2090 weaks
= hlook
->weakdef
;
2091 hlook
->weakdef
= NULL
;
2093 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
2094 || hlook
->root
.type
== bfd_link_hash_defweak
2095 || hlook
->root
.type
== bfd_link_hash_common
2096 || hlook
->root
.type
== bfd_link_hash_indirect
);
2097 slook
= hlook
->root
.u
.def
.section
;
2098 vlook
= hlook
->root
.u
.def
.value
;
2100 hpp
= elf_sym_hashes (abfd
);
2101 hppend
= hpp
+ extsymcount
;
2102 for (; hpp
< hppend
; hpp
++)
2104 struct elf_link_hash_entry
*h
;
2107 if (h
!= NULL
&& h
!= hlook
2108 && h
->root
.type
== bfd_link_hash_defined
2109 && h
->root
.u
.def
.section
== slook
2110 && h
->root
.u
.def
.value
== vlook
)
2114 /* If the weak definition is in the list of dynamic
2115 symbols, make sure the real definition is put there
2117 if (hlook
->dynindx
!= -1
2118 && h
->dynindx
== -1)
2120 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2124 /* If the real definition is in the list of dynamic
2125 symbols, make sure the weak definition is put there
2126 as well. If we don't do this, then the dynamic
2127 loader might not merge the entries for the real
2128 definition and the weak definition. */
2129 if (h
->dynindx
!= -1
2130 && hlook
->dynindx
== -1)
2132 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
2140 /* If this object is the same format as the output object, and it is
2141 not a shared library, then let the backend look through the
2144 This is required to build global offset table entries and to
2145 arrange for dynamic relocs. It is not required for the
2146 particular common case of linking non PIC code, even when linking
2147 against shared libraries, but unfortunately there is no way of
2148 knowing whether an object file has been compiled PIC or not.
2149 Looking through the relocs is not particularly time consuming.
2150 The problem is that we must either (1) keep the relocs in memory,
2151 which causes the linker to require additional runtime memory or
2152 (2) read the relocs twice from the input file, which wastes time.
2153 This would be a good case for using mmap.
2155 I have no idea how to handle linking PIC code into a file of a
2156 different format. It probably can't be done. */
2157 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
2159 && abfd
->xvec
== info
->hash
->creator
2160 && check_relocs
!= NULL
)
2164 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2166 Elf_Internal_Rela
*internal_relocs
;
2169 if ((o
->flags
& SEC_RELOC
) == 0
2170 || o
->reloc_count
== 0
2171 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
2172 && (o
->flags
& SEC_DEBUGGING
) != 0)
2173 || bfd_is_abs_section (o
->output_section
))
2176 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2177 (abfd
, o
, (PTR
) NULL
,
2178 (Elf_Internal_Rela
*) NULL
,
2179 info
->keep_memory
));
2180 if (internal_relocs
== NULL
)
2183 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2185 if (elf_section_data (o
)->relocs
!= internal_relocs
)
2186 free (internal_relocs
);
2193 /* If this is a non-traditional, non-relocateable link, try to
2194 optimize the handling of the .stab/.stabstr sections. */
2196 && ! info
->relocateable
2197 && ! info
->traditional_format
2198 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2199 && is_elf_hash_table (info
)
2200 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2202 asection
*stab
, *stabstr
;
2204 stab
= bfd_get_section_by_name (abfd
, ".stab");
2206 && (stab
->flags
& SEC_MERGE
) == 0
2207 && !bfd_is_abs_section (stab
->output_section
))
2209 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2211 if (stabstr
!= NULL
)
2213 struct bfd_elf_section_data
*secdata
;
2215 secdata
= elf_section_data (stab
);
2216 if (! _bfd_link_section_stabs (abfd
,
2217 & hash_table
->stab_info
,
2219 &secdata
->sec_info
))
2221 if (secdata
->sec_info
)
2222 secdata
->sec_info_type
= ELF_INFO_TYPE_STABS
;
2227 if (! info
->relocateable
&& ! dynamic
2228 && is_elf_hash_table (info
))
2232 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2233 if ((s
->flags
& SEC_MERGE
) != 0
2234 && !bfd_is_abs_section (s
->output_section
))
2236 struct bfd_elf_section_data
*secdata
;
2238 secdata
= elf_section_data (s
);
2239 if (! _bfd_merge_section (abfd
,
2240 & hash_table
->merge_info
,
2241 s
, &secdata
->sec_info
))
2243 else if (secdata
->sec_info
)
2244 secdata
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
2248 if (is_elf_hash_table (info
))
2250 /* Add this bfd to the loaded list. */
2251 struct elf_link_loaded_list
*n
;
2253 n
= ((struct elf_link_loaded_list
*)
2254 bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
)));
2258 n
->next
= hash_table
->loaded
;
2259 hash_table
->loaded
= n
;
2265 if (extversym
!= NULL
)
2268 if (isymbuf
!= NULL
)
2274 /* Create some sections which will be filled in with dynamic linking
2275 information. ABFD is an input file which requires dynamic sections
2276 to be created. The dynamic sections take up virtual memory space
2277 when the final executable is run, so we need to create them before
2278 addresses are assigned to the output sections. We work out the
2279 actual contents and size of these sections later. */
2282 elf_link_create_dynamic_sections (abfd
, info
)
2284 struct bfd_link_info
*info
;
2287 register asection
*s
;
2288 struct elf_link_hash_entry
*h
;
2289 struct elf_backend_data
*bed
;
2291 if (! is_elf_hash_table (info
))
2294 if (elf_hash_table (info
)->dynamic_sections_created
)
2297 /* Make sure that all dynamic sections use the same input BFD. */
2298 if (elf_hash_table (info
)->dynobj
== NULL
)
2299 elf_hash_table (info
)->dynobj
= abfd
;
2301 abfd
= elf_hash_table (info
)->dynobj
;
2303 /* Note that we set the SEC_IN_MEMORY flag for all of these
2305 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2306 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2308 /* A dynamically linked executable has a .interp section, but a
2309 shared library does not. */
2312 s
= bfd_make_section (abfd
, ".interp");
2314 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2318 if (! info
->traditional_format
2319 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
2321 s
= bfd_make_section (abfd
, ".eh_frame_hdr");
2323 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2324 || ! bfd_set_section_alignment (abfd
, s
, 2))
2328 /* Create sections to hold version informations. These are removed
2329 if they are not needed. */
2330 s
= bfd_make_section (abfd
, ".gnu.version_d");
2332 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2333 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2336 s
= bfd_make_section (abfd
, ".gnu.version");
2338 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2339 || ! bfd_set_section_alignment (abfd
, s
, 1))
2342 s
= bfd_make_section (abfd
, ".gnu.version_r");
2344 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2345 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2348 s
= bfd_make_section (abfd
, ".dynsym");
2350 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2351 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2354 s
= bfd_make_section (abfd
, ".dynstr");
2356 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2359 /* Create a strtab to hold the dynamic symbol names. */
2360 if (elf_hash_table (info
)->dynstr
== NULL
)
2362 elf_hash_table (info
)->dynstr
= _bfd_elf_strtab_init ();
2363 if (elf_hash_table (info
)->dynstr
== NULL
)
2367 s
= bfd_make_section (abfd
, ".dynamic");
2369 || ! bfd_set_section_flags (abfd
, s
, flags
)
2370 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2373 /* The special symbol _DYNAMIC is always set to the start of the
2374 .dynamic section. This call occurs before we have processed the
2375 symbols for any dynamic object, so we don't have to worry about
2376 overriding a dynamic definition. We could set _DYNAMIC in a
2377 linker script, but we only want to define it if we are, in fact,
2378 creating a .dynamic section. We don't want to define it if there
2379 is no .dynamic section, since on some ELF platforms the start up
2380 code examines it to decide how to initialize the process. */
2382 if (! (_bfd_generic_link_add_one_symbol
2383 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2384 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2385 (struct bfd_link_hash_entry
**) &h
)))
2387 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2388 h
->type
= STT_OBJECT
;
2391 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2394 bed
= get_elf_backend_data (abfd
);
2396 s
= bfd_make_section (abfd
, ".hash");
2398 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2399 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2401 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2403 /* Let the backend create the rest of the sections. This lets the
2404 backend set the right flags. The backend will normally create
2405 the .got and .plt sections. */
2406 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2409 elf_hash_table (info
)->dynamic_sections_created
= true;
2414 /* Add an entry to the .dynamic table. */
2417 elf_add_dynamic_entry (info
, tag
, val
)
2418 struct bfd_link_info
*info
;
2422 Elf_Internal_Dyn dyn
;
2425 bfd_size_type newsize
;
2426 bfd_byte
*newcontents
;
2428 if (! is_elf_hash_table (info
))
2431 dynobj
= elf_hash_table (info
)->dynobj
;
2433 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2434 BFD_ASSERT (s
!= NULL
);
2436 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2437 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2438 if (newcontents
== NULL
)
2442 dyn
.d_un
.d_val
= val
;
2443 elf_swap_dyn_out (dynobj
, &dyn
,
2444 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2446 s
->_raw_size
= newsize
;
2447 s
->contents
= newcontents
;
2452 /* Record a new local dynamic symbol. */
2455 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2456 struct bfd_link_info
*info
;
2460 struct elf_link_local_dynamic_entry
*entry
;
2461 struct elf_link_hash_table
*eht
;
2462 struct elf_strtab_hash
*dynstr
;
2463 Elf_External_Sym esym
;
2464 Elf_External_Sym_Shndx eshndx
;
2465 Elf_External_Sym_Shndx
*shndx
;
2466 unsigned long dynstr_index
;
2471 if (! is_elf_hash_table (info
))
2474 /* See if the entry exists already. */
2475 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2476 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2479 entry
= (struct elf_link_local_dynamic_entry
*)
2480 bfd_alloc (input_bfd
, (bfd_size_type
) sizeof (*entry
));
2484 /* Go find the symbol, so that we can find it's name. */
2485 amt
= sizeof (Elf_External_Sym
);
2486 pos
= elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
+ input_indx
* amt
;
2487 if (bfd_seek (input_bfd
, pos
, SEEK_SET
) != 0
2488 || bfd_bread ((PTR
) &esym
, amt
, input_bfd
) != amt
)
2491 if (elf_tdata (input_bfd
)->symtab_shndx_hdr
.sh_size
!= 0)
2493 amt
= sizeof (Elf_External_Sym_Shndx
);
2494 pos
= elf_tdata (input_bfd
)->symtab_shndx_hdr
.sh_offset
;
2495 pos
+= input_indx
* amt
;
2497 if (bfd_seek (input_bfd
, pos
, SEEK_SET
) != 0
2498 || bfd_bread ((PTR
) shndx
, amt
, input_bfd
) != amt
)
2501 elf_swap_symbol_in (input_bfd
, (const PTR
) &esym
, (const PTR
) shndx
,
2504 name
= (bfd_elf_string_from_elf_section
2505 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2506 entry
->isym
.st_name
));
2508 dynstr
= elf_hash_table (info
)->dynstr
;
2511 /* Create a strtab to hold the dynamic symbol names. */
2512 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
2517 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, false);
2518 if (dynstr_index
== (unsigned long) -1)
2520 entry
->isym
.st_name
= dynstr_index
;
2522 eht
= elf_hash_table (info
);
2524 entry
->next
= eht
->dynlocal
;
2525 eht
->dynlocal
= entry
;
2526 entry
->input_bfd
= input_bfd
;
2527 entry
->input_indx
= input_indx
;
2530 /* Whatever binding the symbol had before, it's now local. */
2532 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2534 /* The dynindx will be set at the end of size_dynamic_sections. */
2539 /* Read and swap the relocs from the section indicated by SHDR. This
2540 may be either a REL or a RELA section. The relocations are
2541 translated into RELA relocations and stored in INTERNAL_RELOCS,
2542 which should have already been allocated to contain enough space.
2543 The EXTERNAL_RELOCS are a buffer where the external form of the
2544 relocations should be stored.
2546 Returns false if something goes wrong. */
2549 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2552 Elf_Internal_Shdr
*shdr
;
2553 PTR external_relocs
;
2554 Elf_Internal_Rela
*internal_relocs
;
2556 struct elf_backend_data
*bed
;
2559 /* If there aren't any relocations, that's OK. */
2563 /* Position ourselves at the start of the section. */
2564 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2567 /* Read the relocations. */
2568 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2571 bed
= get_elf_backend_data (abfd
);
2573 /* Convert the external relocations to the internal format. */
2574 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2576 Elf_External_Rel
*erel
;
2577 Elf_External_Rel
*erelend
;
2578 Elf_Internal_Rela
*irela
;
2579 Elf_Internal_Rel
*irel
;
2581 erel
= (Elf_External_Rel
*) external_relocs
;
2582 erelend
= erel
+ NUM_SHDR_ENTRIES (shdr
);
2583 irela
= internal_relocs
;
2584 amt
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
2585 irel
= bfd_alloc (abfd
, amt
);
2586 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2590 if (bed
->s
->swap_reloc_in
)
2591 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2593 elf_swap_reloc_in (abfd
, erel
, irel
);
2595 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2597 irela
[i
].r_offset
= irel
[i
].r_offset
;
2598 irela
[i
].r_info
= irel
[i
].r_info
;
2599 irela
[i
].r_addend
= 0;
2605 Elf_External_Rela
*erela
;
2606 Elf_External_Rela
*erelaend
;
2607 Elf_Internal_Rela
*irela
;
2609 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2611 erela
= (Elf_External_Rela
*) external_relocs
;
2612 erelaend
= erela
+ NUM_SHDR_ENTRIES (shdr
);
2613 irela
= internal_relocs
;
2614 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2616 if (bed
->s
->swap_reloca_in
)
2617 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2619 elf_swap_reloca_in (abfd
, erela
, irela
);
2626 /* Read and swap the relocs for a section O. They may have been
2627 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2628 not NULL, they are used as buffers to read into. They are known to
2629 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2630 the return value is allocated using either malloc or bfd_alloc,
2631 according to the KEEP_MEMORY argument. If O has two relocation
2632 sections (both REL and RELA relocations), then the REL_HDR
2633 relocations will appear first in INTERNAL_RELOCS, followed by the
2634 REL_HDR2 relocations. */
2637 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2641 PTR external_relocs
;
2642 Elf_Internal_Rela
*internal_relocs
;
2643 boolean keep_memory
;
2645 Elf_Internal_Shdr
*rel_hdr
;
2647 Elf_Internal_Rela
*alloc2
= NULL
;
2648 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2650 if (elf_section_data (o
)->relocs
!= NULL
)
2651 return elf_section_data (o
)->relocs
;
2653 if (o
->reloc_count
== 0)
2656 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2658 if (internal_relocs
== NULL
)
2662 size
= o
->reloc_count
;
2663 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2665 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2667 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2668 if (internal_relocs
== NULL
)
2672 if (external_relocs
== NULL
)
2674 bfd_size_type size
= rel_hdr
->sh_size
;
2676 if (elf_section_data (o
)->rel_hdr2
)
2677 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
2678 alloc1
= (PTR
) bfd_malloc (size
);
2681 external_relocs
= alloc1
;
2684 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2688 if (!elf_link_read_relocs_from_section
2690 elf_section_data (o
)->rel_hdr2
,
2691 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2692 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2693 * bed
->s
->int_rels_per_ext_rel
)))
2696 /* Cache the results for next time, if we can. */
2698 elf_section_data (o
)->relocs
= internal_relocs
;
2703 /* Don't free alloc2, since if it was allocated we are passing it
2704 back (under the name of internal_relocs). */
2706 return internal_relocs
;
2716 /* Record an assignment to a symbol made by a linker script. We need
2717 this in case some dynamic object refers to this symbol. */
2720 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2721 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2722 struct bfd_link_info
*info
;
2726 struct elf_link_hash_entry
*h
;
2728 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2731 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2735 if (h
->root
.type
== bfd_link_hash_new
)
2736 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_ELF
;
2738 /* If this symbol is being provided by the linker script, and it is
2739 currently defined by a dynamic object, but not by a regular
2740 object, then mark it as undefined so that the generic linker will
2741 force the correct value. */
2743 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2744 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2745 h
->root
.type
= bfd_link_hash_undefined
;
2747 /* If this symbol is not being provided by the linker script, and it is
2748 currently defined by a dynamic object, but not by a regular object,
2749 then clear out any version information because the symbol will not be
2750 associated with the dynamic object any more. */
2752 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2753 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2754 h
->verinfo
.verdef
= NULL
;
2756 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2758 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2759 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2761 && h
->dynindx
== -1)
2763 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2766 /* If this is a weak defined symbol, and we know a corresponding
2767 real symbol from the same dynamic object, make sure the real
2768 symbol is also made into a dynamic symbol. */
2769 if (h
->weakdef
!= NULL
2770 && h
->weakdef
->dynindx
== -1)
2772 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2780 /* This structure is used to pass information to
2781 elf_link_assign_sym_version. */
2783 struct elf_assign_sym_version_info
2787 /* General link information. */
2788 struct bfd_link_info
*info
;
2790 struct bfd_elf_version_tree
*verdefs
;
2791 /* Whether we had a failure. */
2795 /* This structure is used to pass information to
2796 elf_link_find_version_dependencies. */
2798 struct elf_find_verdep_info
2802 /* General link information. */
2803 struct bfd_link_info
*info
;
2804 /* The number of dependencies. */
2806 /* Whether we had a failure. */
2810 /* Array used to determine the number of hash table buckets to use
2811 based on the number of symbols there are. If there are fewer than
2812 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2813 fewer than 37 we use 17 buckets, and so forth. We never use more
2814 than 32771 buckets. */
2816 static const size_t elf_buckets
[] =
2818 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2822 /* Compute bucket count for hashing table. We do not use a static set
2823 of possible tables sizes anymore. Instead we determine for all
2824 possible reasonable sizes of the table the outcome (i.e., the
2825 number of collisions etc) and choose the best solution. The
2826 weighting functions are not too simple to allow the table to grow
2827 without bounds. Instead one of the weighting factors is the size.
2828 Therefore the result is always a good payoff between few collisions
2829 (= short chain lengths) and table size. */
2831 compute_bucket_count (info
)
2832 struct bfd_link_info
*info
;
2834 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2835 size_t best_size
= 0;
2836 unsigned long int *hashcodes
;
2837 unsigned long int *hashcodesp
;
2838 unsigned long int i
;
2841 /* Compute the hash values for all exported symbols. At the same
2842 time store the values in an array so that we could use them for
2845 amt
*= sizeof (unsigned long int);
2846 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
2847 if (hashcodes
== NULL
)
2849 hashcodesp
= hashcodes
;
2851 /* Put all hash values in HASHCODES. */
2852 elf_link_hash_traverse (elf_hash_table (info
),
2853 elf_collect_hash_codes
, &hashcodesp
);
2855 /* We have a problem here. The following code to optimize the table
2856 size requires an integer type with more the 32 bits. If
2857 BFD_HOST_U_64_BIT is set we know about such a type. */
2858 #ifdef BFD_HOST_U_64_BIT
2861 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2864 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2865 unsigned long int *counts
;
2867 /* Possible optimization parameters: if we have NSYMS symbols we say
2868 that the hashing table must at least have NSYMS/4 and at most
2870 minsize
= nsyms
/ 4;
2873 best_size
= maxsize
= nsyms
* 2;
2875 /* Create array where we count the collisions in. We must use bfd_malloc
2876 since the size could be large. */
2878 amt
*= sizeof (unsigned long int);
2879 counts
= (unsigned long int *) bfd_malloc (amt
);
2886 /* Compute the "optimal" size for the hash table. The criteria is a
2887 minimal chain length. The minor criteria is (of course) the size
2889 for (i
= minsize
; i
< maxsize
; ++i
)
2891 /* Walk through the array of hashcodes and count the collisions. */
2892 BFD_HOST_U_64_BIT max
;
2893 unsigned long int j
;
2894 unsigned long int fact
;
2896 memset (counts
, '\0', i
* sizeof (unsigned long int));
2898 /* Determine how often each hash bucket is used. */
2899 for (j
= 0; j
< nsyms
; ++j
)
2900 ++counts
[hashcodes
[j
] % i
];
2902 /* For the weight function we need some information about the
2903 pagesize on the target. This is information need not be 100%
2904 accurate. Since this information is not available (so far) we
2905 define it here to a reasonable default value. If it is crucial
2906 to have a better value some day simply define this value. */
2907 # ifndef BFD_TARGET_PAGESIZE
2908 # define BFD_TARGET_PAGESIZE (4096)
2911 /* We in any case need 2 + NSYMS entries for the size values and
2913 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2916 /* Variant 1: optimize for short chains. We add the squares
2917 of all the chain lengths (which favous many small chain
2918 over a few long chains). */
2919 for (j
= 0; j
< i
; ++j
)
2920 max
+= counts
[j
] * counts
[j
];
2922 /* This adds penalties for the overall size of the table. */
2923 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2926 /* Variant 2: Optimize a lot more for small table. Here we
2927 also add squares of the size but we also add penalties for
2928 empty slots (the +1 term). */
2929 for (j
= 0; j
< i
; ++j
)
2930 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2932 /* The overall size of the table is considered, but not as
2933 strong as in variant 1, where it is squared. */
2934 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2938 /* Compare with current best results. */
2939 if (max
< best_chlen
)
2949 #endif /* defined (BFD_HOST_U_64_BIT) */
2951 /* This is the fallback solution if no 64bit type is available or if we
2952 are not supposed to spend much time on optimizations. We select the
2953 bucket count using a fixed set of numbers. */
2954 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2956 best_size
= elf_buckets
[i
];
2957 if (dynsymcount
< elf_buckets
[i
+ 1])
2962 /* Free the arrays we needed. */
2968 /* Set up the sizes and contents of the ELF dynamic sections. This is
2969 called by the ELF linker emulation before_allocation routine. We
2970 must set the sizes of the sections before the linker sets the
2971 addresses of the various sections. */
2974 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2976 auxiliary_filters
, info
, sinterpptr
,
2981 const char *filter_shlib
;
2982 const char * const *auxiliary_filters
;
2983 struct bfd_link_info
*info
;
2984 asection
**sinterpptr
;
2985 struct bfd_elf_version_tree
*verdefs
;
2987 bfd_size_type soname_indx
;
2989 struct elf_backend_data
*bed
;
2990 struct elf_assign_sym_version_info asvinfo
;
2994 soname_indx
= (bfd_size_type
) -1;
2996 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2999 if (! is_elf_hash_table (info
))
3002 /* Any syms created from now on start with -1 in
3003 got.refcount/offset and plt.refcount/offset. */
3004 elf_hash_table (info
)->init_refcount
= -1;
3006 /* The backend may have to create some sections regardless of whether
3007 we're dynamic or not. */
3008 bed
= get_elf_backend_data (output_bfd
);
3009 if (bed
->elf_backend_always_size_sections
3010 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
3013 dynobj
= elf_hash_table (info
)->dynobj
;
3015 /* If there were no dynamic objects in the link, there is nothing to
3020 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
3023 if (elf_hash_table (info
)->dynamic_sections_created
)
3025 struct elf_info_failed eif
;
3026 struct elf_link_hash_entry
*h
;
3029 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
3030 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
3034 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3036 if (soname_indx
== (bfd_size_type
) -1
3037 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SONAME
,
3044 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMBOLIC
,
3047 info
->flags
|= DF_SYMBOLIC
;
3054 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
3056 if (info
->new_dtags
)
3057 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
3058 if (indx
== (bfd_size_type
) -1
3059 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RPATH
, indx
)
3061 && ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RUNPATH
,
3066 if (filter_shlib
!= NULL
)
3070 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3071 filter_shlib
, true);
3072 if (indx
== (bfd_size_type
) -1
3073 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FILTER
, indx
))
3077 if (auxiliary_filters
!= NULL
)
3079 const char * const *p
;
3081 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
3085 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3087 if (indx
== (bfd_size_type
) -1
3088 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_AUXILIARY
,
3095 eif
.verdefs
= verdefs
;
3098 /* If we are supposed to export all symbols into the dynamic symbol
3099 table (this is not the normal case), then do so. */
3100 if (info
->export_dynamic
)
3102 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
3108 /* Attach all the symbols to their version information. */
3109 asvinfo
.output_bfd
= output_bfd
;
3110 asvinfo
.info
= info
;
3111 asvinfo
.verdefs
= verdefs
;
3112 asvinfo
.failed
= false;
3114 elf_link_hash_traverse (elf_hash_table (info
),
3115 elf_link_assign_sym_version
,
3120 /* Find all symbols which were defined in a dynamic object and make
3121 the backend pick a reasonable value for them. */
3122 elf_link_hash_traverse (elf_hash_table (info
),
3123 elf_adjust_dynamic_symbol
,
3128 /* Add some entries to the .dynamic section. We fill in some of the
3129 values later, in elf_bfd_final_link, but we must add the entries
3130 now so that we know the final size of the .dynamic section. */
3132 /* If there are initialization and/or finalization functions to
3133 call then add the corresponding DT_INIT/DT_FINI entries. */
3134 h
= (info
->init_function
3135 ? elf_link_hash_lookup (elf_hash_table (info
),
3136 info
->init_function
, false,
3140 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3141 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3143 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT
, (bfd_vma
) 0))
3146 h
= (info
->fini_function
3147 ? elf_link_hash_lookup (elf_hash_table (info
),
3148 info
->fini_function
, false,
3152 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3153 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3155 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI
, (bfd_vma
) 0))
3159 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
3161 /* DT_PREINIT_ARRAY is not allowed in shared library. */
3167 for (sub
= info
->input_bfds
; sub
!= NULL
;
3168 sub
= sub
->link_next
)
3169 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
3170 if (elf_section_data (o
)->this_hdr
.sh_type
3171 == SHT_PREINIT_ARRAY
)
3173 (*_bfd_error_handler
)
3174 (_("%s: .preinit_array section is not allowed in DSO"),
3175 bfd_archive_filename (sub
));
3179 bfd_set_error (bfd_error_nonrepresentable_section
);
3183 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAY
,
3185 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAYSZ
,
3189 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
3191 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAY
,
3193 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAYSZ
,
3197 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
3199 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAY
,
3201 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAYSZ
,
3206 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
3207 /* If .dynstr is excluded from the link, we don't want any of
3208 these tags. Strictly, we should be checking each section
3209 individually; This quick check covers for the case where
3210 someone does a /DISCARD/ : { *(*) }. */
3211 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
3213 bfd_size_type strsize
;
3215 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3216 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_HASH
, (bfd_vma
) 0)
3217 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRTAB
, (bfd_vma
) 0)
3218 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMTAB
, (bfd_vma
) 0)
3219 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRSZ
, strsize
)
3220 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMENT
,
3221 (bfd_vma
) sizeof (Elf_External_Sym
)))
3226 /* The backend must work out the sizes of all the other dynamic
3228 if (bed
->elf_backend_size_dynamic_sections
3229 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
3232 if (elf_hash_table (info
)->dynamic_sections_created
)
3234 bfd_size_type dynsymcount
;
3236 size_t bucketcount
= 0;
3237 size_t hash_entry_size
;
3238 unsigned int dtagcount
;
3240 /* Set up the version definition section. */
3241 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3242 BFD_ASSERT (s
!= NULL
);
3244 /* We may have created additional version definitions if we are
3245 just linking a regular application. */
3246 verdefs
= asvinfo
.verdefs
;
3248 /* Skip anonymous version tag. */
3249 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
3250 verdefs
= verdefs
->next
;
3252 if (verdefs
== NULL
)
3253 _bfd_strip_section_from_output (info
, s
);
3258 struct bfd_elf_version_tree
*t
;
3260 Elf_Internal_Verdef def
;
3261 Elf_Internal_Verdaux defaux
;
3266 /* Make space for the base version. */
3267 size
+= sizeof (Elf_External_Verdef
);
3268 size
+= sizeof (Elf_External_Verdaux
);
3271 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3273 struct bfd_elf_version_deps
*n
;
3275 size
+= sizeof (Elf_External_Verdef
);
3276 size
+= sizeof (Elf_External_Verdaux
);
3279 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3280 size
+= sizeof (Elf_External_Verdaux
);
3283 s
->_raw_size
= size
;
3284 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3285 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3288 /* Fill in the version definition section. */
3292 def
.vd_version
= VER_DEF_CURRENT
;
3293 def
.vd_flags
= VER_FLG_BASE
;
3296 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3297 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3298 + sizeof (Elf_External_Verdaux
));
3300 if (soname_indx
!= (bfd_size_type
) -1)
3302 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3304 def
.vd_hash
= bfd_elf_hash (soname
);
3305 defaux
.vda_name
= soname_indx
;
3312 name
= basename (output_bfd
->filename
);
3313 def
.vd_hash
= bfd_elf_hash (name
);
3314 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3316 if (indx
== (bfd_size_type
) -1)
3318 defaux
.vda_name
= indx
;
3320 defaux
.vda_next
= 0;
3322 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3323 (Elf_External_Verdef
*) p
);
3324 p
+= sizeof (Elf_External_Verdef
);
3325 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3326 (Elf_External_Verdaux
*) p
);
3327 p
+= sizeof (Elf_External_Verdaux
);
3329 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3332 struct bfd_elf_version_deps
*n
;
3333 struct elf_link_hash_entry
*h
;
3336 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3339 /* Add a symbol representing this version. */
3341 if (! (_bfd_generic_link_add_one_symbol
3342 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3343 (bfd_vma
) 0, (const char *) NULL
, false,
3344 get_elf_backend_data (dynobj
)->collect
,
3345 (struct bfd_link_hash_entry
**) &h
)))
3347 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3348 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3349 h
->type
= STT_OBJECT
;
3350 h
->verinfo
.vertree
= t
;
3352 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3355 def
.vd_version
= VER_DEF_CURRENT
;
3357 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3358 def
.vd_flags
|= VER_FLG_WEAK
;
3359 def
.vd_ndx
= t
->vernum
+ 1;
3360 def
.vd_cnt
= cdeps
+ 1;
3361 def
.vd_hash
= bfd_elf_hash (t
->name
);
3362 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3363 if (t
->next
!= NULL
)
3364 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3365 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3369 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3370 (Elf_External_Verdef
*) p
);
3371 p
+= sizeof (Elf_External_Verdef
);
3373 defaux
.vda_name
= h
->dynstr_index
;
3374 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3376 if (t
->deps
== NULL
)
3377 defaux
.vda_next
= 0;
3379 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3380 t
->name_indx
= defaux
.vda_name
;
3382 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3383 (Elf_External_Verdaux
*) p
);
3384 p
+= sizeof (Elf_External_Verdaux
);
3386 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3388 if (n
->version_needed
== NULL
)
3390 /* This can happen if there was an error in the
3392 defaux
.vda_name
= 0;
3396 defaux
.vda_name
= n
->version_needed
->name_indx
;
3397 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3400 if (n
->next
== NULL
)
3401 defaux
.vda_next
= 0;
3403 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3405 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3406 (Elf_External_Verdaux
*) p
);
3407 p
+= sizeof (Elf_External_Verdaux
);
3411 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEF
, (bfd_vma
) 0)
3412 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEFNUM
,
3416 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3419 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
3421 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS
, info
->flags
))
3428 info
->flags_1
&= ~ (DF_1_INITFIRST
3431 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS_1
,
3436 /* Work out the size of the version reference section. */
3438 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3439 BFD_ASSERT (s
!= NULL
);
3441 struct elf_find_verdep_info sinfo
;
3443 sinfo
.output_bfd
= output_bfd
;
3445 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3446 if (sinfo
.vers
== 0)
3448 sinfo
.failed
= false;
3450 elf_link_hash_traverse (elf_hash_table (info
),
3451 elf_link_find_version_dependencies
,
3454 if (elf_tdata (output_bfd
)->verref
== NULL
)
3455 _bfd_strip_section_from_output (info
, s
);
3458 Elf_Internal_Verneed
*t
;
3463 /* Build the version definition section. */
3466 for (t
= elf_tdata (output_bfd
)->verref
;
3470 Elf_Internal_Vernaux
*a
;
3472 size
+= sizeof (Elf_External_Verneed
);
3474 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3475 size
+= sizeof (Elf_External_Vernaux
);
3478 s
->_raw_size
= size
;
3479 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3480 if (s
->contents
== NULL
)
3484 for (t
= elf_tdata (output_bfd
)->verref
;
3489 Elf_Internal_Vernaux
*a
;
3493 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3496 t
->vn_version
= VER_NEED_CURRENT
;
3498 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3499 elf_dt_name (t
->vn_bfd
) != NULL
3500 ? elf_dt_name (t
->vn_bfd
)
3501 : basename (t
->vn_bfd
->filename
),
3503 if (indx
== (bfd_size_type
) -1)
3506 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3507 if (t
->vn_nextref
== NULL
)
3510 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3511 + caux
* sizeof (Elf_External_Vernaux
));
3513 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3514 (Elf_External_Verneed
*) p
);
3515 p
+= sizeof (Elf_External_Verneed
);
3517 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3519 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3520 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3521 a
->vna_nodename
, false);
3522 if (indx
== (bfd_size_type
) -1)
3525 if (a
->vna_nextptr
== NULL
)
3528 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3530 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3531 (Elf_External_Vernaux
*) p
);
3532 p
+= sizeof (Elf_External_Vernaux
);
3536 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEED
,
3538 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEEDNUM
,
3542 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3546 /* Assign dynsym indicies. In a shared library we generate a
3547 section symbol for each output section, which come first.
3548 Next come all of the back-end allocated local dynamic syms,
3549 followed by the rest of the global symbols. */
3551 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3553 /* Work out the size of the symbol version section. */
3554 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3555 BFD_ASSERT (s
!= NULL
);
3556 if (dynsymcount
== 0
3557 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3559 _bfd_strip_section_from_output (info
, s
);
3560 /* The DYNSYMCOUNT might have changed if we were going to
3561 output a dynamic symbol table entry for S. */
3562 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3566 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3567 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3568 if (s
->contents
== NULL
)
3571 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERSYM
, (bfd_vma
) 0))
3575 /* Set the size of the .dynsym and .hash sections. We counted
3576 the number of dynamic symbols in elf_link_add_object_symbols.
3577 We will build the contents of .dynsym and .hash when we build
3578 the final symbol table, because until then we do not know the
3579 correct value to give the symbols. We built the .dynstr
3580 section as we went along in elf_link_add_object_symbols. */
3581 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3582 BFD_ASSERT (s
!= NULL
);
3583 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3584 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3585 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3588 if (dynsymcount
!= 0)
3590 Elf_Internal_Sym isym
;
3592 /* The first entry in .dynsym is a dummy symbol. */
3599 elf_swap_symbol_out (output_bfd
, &isym
, (PTR
) s
->contents
, (PTR
) 0);
3602 /* Compute the size of the hashing table. As a side effect this
3603 computes the hash values for all the names we export. */
3604 bucketcount
= compute_bucket_count (info
);
3606 s
= bfd_get_section_by_name (dynobj
, ".hash");
3607 BFD_ASSERT (s
!= NULL
);
3608 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3609 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3610 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3611 if (s
->contents
== NULL
)
3614 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) bucketcount
,
3616 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) dynsymcount
,
3617 s
->contents
+ hash_entry_size
);
3619 elf_hash_table (info
)->bucketcount
= bucketcount
;
3621 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3622 BFD_ASSERT (s
!= NULL
);
3624 elf_finalize_dynstr (output_bfd
, info
);
3626 s
->_raw_size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3628 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
3629 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NULL
, (bfd_vma
) 0))
3636 /* This function is used to adjust offsets into .dynstr for
3637 dynamic symbols. This is called via elf_link_hash_traverse. */
3639 static boolean elf_adjust_dynstr_offsets
3640 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3643 elf_adjust_dynstr_offsets (h
, data
)
3644 struct elf_link_hash_entry
*h
;
3647 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3649 if (h
->root
.type
== bfd_link_hash_warning
)
3650 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3652 if (h
->dynindx
!= -1)
3653 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3657 /* Assign string offsets in .dynstr, update all structures referencing
3661 elf_finalize_dynstr (output_bfd
, info
)
3663 struct bfd_link_info
*info
;
3665 struct elf_link_local_dynamic_entry
*entry
;
3666 struct elf_strtab_hash
*dynstr
= elf_hash_table (info
)->dynstr
;
3667 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
3670 Elf_External_Dyn
*dyncon
, *dynconend
;
3672 _bfd_elf_strtab_finalize (dynstr
);
3673 size
= _bfd_elf_strtab_size (dynstr
);
3675 /* Update all .dynamic entries referencing .dynstr strings. */
3676 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3677 BFD_ASSERT (sdyn
!= NULL
);
3679 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
3680 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
3682 for (; dyncon
< dynconend
; dyncon
++)
3684 Elf_Internal_Dyn dyn
;
3686 elf_swap_dyn_in (dynobj
, dyncon
, & dyn
);
3690 dyn
.d_un
.d_val
= size
;
3691 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3699 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3700 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3707 /* Now update local dynamic symbols. */
3708 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
3709 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3710 entry
->isym
.st_name
);
3712 /* And the rest of dynamic symbols. */
3713 elf_link_hash_traverse (elf_hash_table (info
),
3714 elf_adjust_dynstr_offsets
, dynstr
);
3716 /* Adjust version definitions. */
3717 if (elf_tdata (output_bfd
)->cverdefs
)
3722 Elf_Internal_Verdef def
;
3723 Elf_Internal_Verdaux defaux
;
3725 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3726 p
= (bfd_byte
*) s
->contents
;
3729 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3731 p
+= sizeof (Elf_External_Verdef
);
3732 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3734 _bfd_elf_swap_verdaux_in (output_bfd
,
3735 (Elf_External_Verdaux
*) p
, &defaux
);
3736 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3738 _bfd_elf_swap_verdaux_out (output_bfd
,
3739 &defaux
, (Elf_External_Verdaux
*) p
);
3740 p
+= sizeof (Elf_External_Verdaux
);
3743 while (def
.vd_next
);
3746 /* Adjust version references. */
3747 if (elf_tdata (output_bfd
)->verref
)
3752 Elf_Internal_Verneed need
;
3753 Elf_Internal_Vernaux needaux
;
3755 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3756 p
= (bfd_byte
*) s
->contents
;
3759 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3761 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3762 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3763 (Elf_External_Verneed
*) p
);
3764 p
+= sizeof (Elf_External_Verneed
);
3765 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3767 _bfd_elf_swap_vernaux_in (output_bfd
,
3768 (Elf_External_Vernaux
*) p
, &needaux
);
3769 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3771 _bfd_elf_swap_vernaux_out (output_bfd
,
3773 (Elf_External_Vernaux
*) p
);
3774 p
+= sizeof (Elf_External_Vernaux
);
3777 while (need
.vn_next
);
3783 /* Fix up the flags for a symbol. This handles various cases which
3784 can only be fixed after all the input files are seen. This is
3785 currently called by both adjust_dynamic_symbol and
3786 assign_sym_version, which is unnecessary but perhaps more robust in
3787 the face of future changes. */
3790 elf_fix_symbol_flags (h
, eif
)
3791 struct elf_link_hash_entry
*h
;
3792 struct elf_info_failed
*eif
;
3794 /* If this symbol was mentioned in a non-ELF file, try to set
3795 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3796 permit a non-ELF file to correctly refer to a symbol defined in
3797 an ELF dynamic object. */
3798 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3800 while (h
->root
.type
== bfd_link_hash_indirect
)
3801 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3803 if (h
->root
.type
!= bfd_link_hash_defined
3804 && h
->root
.type
!= bfd_link_hash_defweak
)
3805 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3806 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3809 if (h
->root
.u
.def
.section
->owner
!= NULL
3810 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3811 == bfd_target_elf_flavour
))
3812 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3813 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3815 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3818 if (h
->dynindx
== -1
3819 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3820 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3822 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3831 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3832 was first seen in a non-ELF file. Fortunately, if the symbol
3833 was first seen in an ELF file, we're probably OK unless the
3834 symbol was defined in a non-ELF file. Catch that case here.
3835 FIXME: We're still in trouble if the symbol was first seen in
3836 a dynamic object, and then later in a non-ELF regular object. */
3837 if ((h
->root
.type
== bfd_link_hash_defined
3838 || h
->root
.type
== bfd_link_hash_defweak
)
3839 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3840 && (h
->root
.u
.def
.section
->owner
!= NULL
3841 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3842 != bfd_target_elf_flavour
)
3843 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3844 && (h
->elf_link_hash_flags
3845 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3846 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3849 /* If this is a final link, and the symbol was defined as a common
3850 symbol in a regular object file, and there was no definition in
3851 any dynamic object, then the linker will have allocated space for
3852 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3853 flag will not have been set. */
3854 if (h
->root
.type
== bfd_link_hash_defined
3855 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3856 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3857 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3858 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3859 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3861 /* If -Bsymbolic was used (which means to bind references to global
3862 symbols to the definition within the shared object), and this
3863 symbol was defined in a regular object, then it actually doesn't
3864 need a PLT entry, and we can accomplish that by forcing it local.
3865 Likewise, if the symbol has hidden or internal visibility.
3866 FIXME: It might be that we also do not need a PLT for other
3867 non-hidden visibilities, but we would have to tell that to the
3868 backend specifically; we can't just clear PLT-related data here. */
3869 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3870 && eif
->info
->shared
3871 && is_elf_hash_table (eif
->info
)
3872 && (eif
->info
->symbolic
3873 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3874 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
3875 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3877 struct elf_backend_data
*bed
;
3878 boolean force_local
;
3880 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3882 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3883 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
3884 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
3887 /* If this is a weak defined symbol in a dynamic object, and we know
3888 the real definition in the dynamic object, copy interesting flags
3889 over to the real definition. */
3890 if (h
->weakdef
!= NULL
)
3892 struct elf_link_hash_entry
*weakdef
;
3894 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3895 || h
->root
.type
== bfd_link_hash_defweak
);
3896 weakdef
= h
->weakdef
;
3897 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3898 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3899 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3901 /* If the real definition is defined by a regular object file,
3902 don't do anything special. See the longer description in
3903 elf_adjust_dynamic_symbol, below. */
3904 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3908 struct elf_backend_data
*bed
;
3910 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3911 (*bed
->elf_backend_copy_indirect_symbol
) (weakdef
, h
);
3918 /* Make the backend pick a good value for a dynamic symbol. This is
3919 called via elf_link_hash_traverse, and also calls itself
3923 elf_adjust_dynamic_symbol (h
, data
)
3924 struct elf_link_hash_entry
*h
;
3927 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3929 struct elf_backend_data
*bed
;
3931 if (h
->root
.type
== bfd_link_hash_warning
)
3933 h
->plt
.offset
= (bfd_vma
) -1;
3934 h
->got
.offset
= (bfd_vma
) -1;
3936 /* When warning symbols are created, they **replace** the "real"
3937 entry in the hash table, thus we never get to see the real
3938 symbol in a hash traversal. So look at it now. */
3939 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3942 /* Ignore indirect symbols. These are added by the versioning code. */
3943 if (h
->root
.type
== bfd_link_hash_indirect
)
3946 if (! is_elf_hash_table (eif
->info
))
3949 /* Fix the symbol flags. */
3950 if (! elf_fix_symbol_flags (h
, eif
))
3953 /* If this symbol does not require a PLT entry, and it is not
3954 defined by a dynamic object, or is not referenced by a regular
3955 object, ignore it. We do have to handle a weak defined symbol,
3956 even if no regular object refers to it, if we decided to add it
3957 to the dynamic symbol table. FIXME: Do we normally need to worry
3958 about symbols which are defined by one dynamic object and
3959 referenced by another one? */
3960 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3961 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3962 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3963 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3964 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3966 h
->plt
.offset
= (bfd_vma
) -1;
3970 /* If we've already adjusted this symbol, don't do it again. This
3971 can happen via a recursive call. */
3972 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3975 /* Don't look at this symbol again. Note that we must set this
3976 after checking the above conditions, because we may look at a
3977 symbol once, decide not to do anything, and then get called
3978 recursively later after REF_REGULAR is set below. */
3979 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3981 /* If this is a weak definition, and we know a real definition, and
3982 the real symbol is not itself defined by a regular object file,
3983 then get a good value for the real definition. We handle the
3984 real symbol first, for the convenience of the backend routine.
3986 Note that there is a confusing case here. If the real definition
3987 is defined by a regular object file, we don't get the real symbol
3988 from the dynamic object, but we do get the weak symbol. If the
3989 processor backend uses a COPY reloc, then if some routine in the
3990 dynamic object changes the real symbol, we will not see that
3991 change in the corresponding weak symbol. This is the way other
3992 ELF linkers work as well, and seems to be a result of the shared
3995 I will clarify this issue. Most SVR4 shared libraries define the
3996 variable _timezone and define timezone as a weak synonym. The
3997 tzset call changes _timezone. If you write
3998 extern int timezone;
4000 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
4001 you might expect that, since timezone is a synonym for _timezone,
4002 the same number will print both times. However, if the processor
4003 backend uses a COPY reloc, then actually timezone will be copied
4004 into your process image, and, since you define _timezone
4005 yourself, _timezone will not. Thus timezone and _timezone will
4006 wind up at different memory locations. The tzset call will set
4007 _timezone, leaving timezone unchanged. */
4009 if (h
->weakdef
!= NULL
)
4011 /* If we get to this point, we know there is an implicit
4012 reference by a regular object file via the weak symbol H.
4013 FIXME: Is this really true? What if the traversal finds
4014 H->WEAKDEF before it finds H? */
4015 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
4017 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
4021 /* If a symbol has no type and no size and does not require a PLT
4022 entry, then we are probably about to do the wrong thing here: we
4023 are probably going to create a COPY reloc for an empty object.
4024 This case can arise when a shared object is built with assembly
4025 code, and the assembly code fails to set the symbol type. */
4027 && h
->type
== STT_NOTYPE
4028 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
4029 (*_bfd_error_handler
)
4030 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4031 h
->root
.root
.string
);
4033 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
4034 bed
= get_elf_backend_data (dynobj
);
4035 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
4044 /* This routine is used to export all defined symbols into the dynamic
4045 symbol table. It is called via elf_link_hash_traverse. */
4048 elf_export_symbol (h
, data
)
4049 struct elf_link_hash_entry
*h
;
4052 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
4054 /* Ignore indirect symbols. These are added by the versioning code. */
4055 if (h
->root
.type
== bfd_link_hash_indirect
)
4058 if (h
->root
.type
== bfd_link_hash_warning
)
4059 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4061 if (h
->dynindx
== -1
4062 && (h
->elf_link_hash_flags
4063 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
4065 struct bfd_elf_version_tree
*t
;
4066 struct bfd_elf_version_expr
*d
;
4068 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
4070 if (t
->globals
!= NULL
)
4072 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4074 if ((*d
->match
) (d
, h
->root
.root
.string
))
4079 if (t
->locals
!= NULL
)
4081 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4083 if ((*d
->match
) (d
, h
->root
.root
.string
))
4092 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
4103 /* Look through the symbols which are defined in other shared
4104 libraries and referenced here. Update the list of version
4105 dependencies. This will be put into the .gnu.version_r section.
4106 This function is called via elf_link_hash_traverse. */
4109 elf_link_find_version_dependencies (h
, data
)
4110 struct elf_link_hash_entry
*h
;
4113 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
4114 Elf_Internal_Verneed
*t
;
4115 Elf_Internal_Vernaux
*a
;
4118 if (h
->root
.type
== bfd_link_hash_warning
)
4119 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4121 /* We only care about symbols defined in shared objects with version
4123 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
4124 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
4126 || h
->verinfo
.verdef
== NULL
)
4129 /* See if we already know about this version. */
4130 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
4132 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
4135 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4136 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
4142 /* This is a new version. Add it to tree we are building. */
4147 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4150 rinfo
->failed
= true;
4154 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
4155 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
4156 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
4160 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4162 /* Note that we are copying a string pointer here, and testing it
4163 above. If bfd_elf_string_from_elf_section is ever changed to
4164 discard the string data when low in memory, this will have to be
4166 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
4168 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
4169 a
->vna_nextptr
= t
->vn_auxptr
;
4171 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
4174 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4181 /* Figure out appropriate versions for all the symbols. We may not
4182 have the version number script until we have read all of the input
4183 files, so until that point we don't know which symbols should be
4184 local. This function is called via elf_link_hash_traverse. */
4187 elf_link_assign_sym_version (h
, data
)
4188 struct elf_link_hash_entry
*h
;
4191 struct elf_assign_sym_version_info
*sinfo
;
4192 struct bfd_link_info
*info
;
4193 struct elf_backend_data
*bed
;
4194 struct elf_info_failed eif
;
4198 sinfo
= (struct elf_assign_sym_version_info
*) data
;
4201 if (h
->root
.type
== bfd_link_hash_warning
)
4202 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4204 /* Fix the symbol flags. */
4207 if (! elf_fix_symbol_flags (h
, &eif
))
4210 sinfo
->failed
= true;
4214 /* We only need version numbers for symbols defined in regular
4216 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4219 bed
= get_elf_backend_data (sinfo
->output_bfd
);
4220 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4221 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4223 struct bfd_elf_version_tree
*t
;
4228 /* There are two consecutive ELF_VER_CHR characters if this is
4229 not a hidden symbol. */
4231 if (*p
== ELF_VER_CHR
)
4237 /* If there is no version string, we can just return out. */
4241 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4245 /* Look for the version. If we find it, it is no longer weak. */
4246 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4248 if (strcmp (t
->name
, p
) == 0)
4252 struct bfd_elf_version_expr
*d
;
4254 len
= p
- h
->root
.root
.string
;
4255 alc
= bfd_malloc ((bfd_size_type
) len
);
4258 memcpy (alc
, h
->root
.root
.string
, len
- 1);
4259 alc
[len
- 1] = '\0';
4260 if (alc
[len
- 2] == ELF_VER_CHR
)
4261 alc
[len
- 2] = '\0';
4263 h
->verinfo
.vertree
= t
;
4267 if (t
->globals
!= NULL
)
4269 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4270 if ((*d
->match
) (d
, alc
))
4274 /* See if there is anything to force this symbol to
4276 if (d
== NULL
&& t
->locals
!= NULL
)
4278 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4280 if ((*d
->match
) (d
, alc
))
4282 if (h
->dynindx
!= -1
4284 && ! info
->export_dynamic
)
4286 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4299 /* If we are building an application, we need to create a
4300 version node for this version. */
4301 if (t
== NULL
&& ! info
->shared
)
4303 struct bfd_elf_version_tree
**pp
;
4306 /* If we aren't going to export this symbol, we don't need
4307 to worry about it. */
4308 if (h
->dynindx
== -1)
4312 t
= ((struct bfd_elf_version_tree
*)
4313 bfd_alloc (sinfo
->output_bfd
, amt
));
4316 sinfo
->failed
= true;
4325 t
->name_indx
= (unsigned int) -1;
4329 /* Don't count anonymous version tag. */
4330 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
4332 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
4334 t
->vernum
= version_index
;
4338 h
->verinfo
.vertree
= t
;
4342 /* We could not find the version for a symbol when
4343 generating a shared archive. Return an error. */
4344 (*_bfd_error_handler
)
4345 (_("%s: undefined versioned symbol name %s"),
4346 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
4347 bfd_set_error (bfd_error_bad_value
);
4348 sinfo
->failed
= true;
4353 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4356 /* If we don't have a version for this symbol, see if we can find
4358 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
4360 struct bfd_elf_version_tree
*t
;
4361 struct bfd_elf_version_tree
*deflt
;
4362 struct bfd_elf_version_expr
*d
;
4364 /* See if can find what version this symbol is in. If the
4365 symbol is supposed to be local, then don't actually register
4368 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4370 if (t
->globals
!= NULL
)
4372 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4374 if ((*d
->match
) (d
, h
->root
.root
.string
))
4376 h
->verinfo
.vertree
= t
;
4385 if (t
->locals
!= NULL
)
4387 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4389 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
4391 else if ((*d
->match
) (d
, h
->root
.root
.string
))
4393 h
->verinfo
.vertree
= t
;
4394 if (h
->dynindx
!= -1
4396 && ! info
->export_dynamic
)
4398 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4409 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4411 h
->verinfo
.vertree
= deflt
;
4412 if (h
->dynindx
!= -1
4414 && ! info
->export_dynamic
)
4416 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4424 /* Final phase of ELF linker. */
4426 /* A structure we use to avoid passing large numbers of arguments. */
4428 struct elf_final_link_info
4430 /* General link information. */
4431 struct bfd_link_info
*info
;
4434 /* Symbol string table. */
4435 struct bfd_strtab_hash
*symstrtab
;
4436 /* .dynsym section. */
4437 asection
*dynsym_sec
;
4438 /* .hash section. */
4440 /* symbol version section (.gnu.version). */
4441 asection
*symver_sec
;
4442 /* first SHF_TLS section (if any). */
4443 asection
*first_tls_sec
;
4444 /* Buffer large enough to hold contents of any section. */
4446 /* Buffer large enough to hold external relocs of any section. */
4447 PTR external_relocs
;
4448 /* Buffer large enough to hold internal relocs of any section. */
4449 Elf_Internal_Rela
*internal_relocs
;
4450 /* Buffer large enough to hold external local symbols of any input
4452 Elf_External_Sym
*external_syms
;
4453 /* And a buffer for symbol section indices. */
4454 Elf_External_Sym_Shndx
*locsym_shndx
;
4455 /* Buffer large enough to hold internal local symbols of any input
4457 Elf_Internal_Sym
*internal_syms
;
4458 /* Array large enough to hold a symbol index for each local symbol
4459 of any input BFD. */
4461 /* Array large enough to hold a section pointer for each local
4462 symbol of any input BFD. */
4463 asection
**sections
;
4464 /* Buffer to hold swapped out symbols. */
4465 Elf_External_Sym
*symbuf
;
4466 /* And one for symbol section indices. */
4467 Elf_External_Sym_Shndx
*symshndxbuf
;
4468 /* Number of swapped out symbols in buffer. */
4469 size_t symbuf_count
;
4470 /* Number of symbols which fit in symbuf. */
4474 static boolean elf_link_output_sym
4475 PARAMS ((struct elf_final_link_info
*, const char *,
4476 Elf_Internal_Sym
*, asection
*));
4477 static boolean elf_link_flush_output_syms
4478 PARAMS ((struct elf_final_link_info
*));
4479 static boolean elf_link_output_extsym
4480 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4481 static boolean elf_link_sec_merge_syms
4482 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4483 static boolean elf_link_check_versioned_symbol
4484 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
4485 static boolean elf_link_input_bfd
4486 PARAMS ((struct elf_final_link_info
*, bfd
*));
4487 static boolean elf_reloc_link_order
4488 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
4489 struct bfd_link_order
*));
4491 /* This struct is used to pass information to elf_link_output_extsym. */
4493 struct elf_outext_info
4497 struct elf_final_link_info
*finfo
;
4500 /* Compute the size of, and allocate space for, REL_HDR which is the
4501 section header for a section containing relocations for O. */
4504 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4506 Elf_Internal_Shdr
*rel_hdr
;
4509 bfd_size_type reloc_count
;
4510 bfd_size_type num_rel_hashes
;
4512 /* Figure out how many relocations there will be. */
4513 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4514 reloc_count
= elf_section_data (o
)->rel_count
;
4516 reloc_count
= elf_section_data (o
)->rel_count2
;
4518 num_rel_hashes
= o
->reloc_count
;
4519 if (num_rel_hashes
< reloc_count
)
4520 num_rel_hashes
= reloc_count
;
4522 /* That allows us to calculate the size of the section. */
4523 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4525 /* The contents field must last into write_object_contents, so we
4526 allocate it with bfd_alloc rather than malloc. Also since we
4527 cannot be sure that the contents will actually be filled in,
4528 we zero the allocated space. */
4529 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4530 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4533 /* We only allocate one set of hash entries, so we only do it the
4534 first time we are called. */
4535 if (elf_section_data (o
)->rel_hashes
== NULL
4538 struct elf_link_hash_entry
**p
;
4540 p
= ((struct elf_link_hash_entry
**)
4541 bfd_zmalloc (num_rel_hashes
4542 * sizeof (struct elf_link_hash_entry
*)));
4546 elf_section_data (o
)->rel_hashes
= p
;
4552 /* When performing a relocateable link, the input relocations are
4553 preserved. But, if they reference global symbols, the indices
4554 referenced must be updated. Update all the relocations in
4555 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4558 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4560 Elf_Internal_Shdr
*rel_hdr
;
4562 struct elf_link_hash_entry
**rel_hash
;
4565 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4566 Elf_Internal_Rel
*irel
;
4567 Elf_Internal_Rela
*irela
;
4568 bfd_size_type amt
= sizeof (Elf_Internal_Rel
) * bed
->s
->int_rels_per_ext_rel
;
4570 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
4573 (*_bfd_error_handler
) (_("Error: out of memory"));
4577 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
4578 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
4581 (*_bfd_error_handler
) (_("Error: out of memory"));
4585 for (i
= 0; i
< count
; i
++, rel_hash
++)
4587 if (*rel_hash
== NULL
)
4590 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4592 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4594 Elf_External_Rel
*erel
;
4597 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4598 if (bed
->s
->swap_reloc_in
)
4599 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
4601 elf_swap_reloc_in (abfd
, erel
, irel
);
4603 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4604 irel
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4605 ELF_R_TYPE (irel
[j
].r_info
));
4607 if (bed
->s
->swap_reloc_out
)
4608 (*bed
->s
->swap_reloc_out
) (abfd
, irel
, (bfd_byte
*) erel
);
4610 elf_swap_reloc_out (abfd
, irel
, erel
);
4614 Elf_External_Rela
*erela
;
4617 BFD_ASSERT (rel_hdr
->sh_entsize
4618 == sizeof (Elf_External_Rela
));
4620 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4621 if (bed
->s
->swap_reloca_in
)
4622 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
4624 elf_swap_reloca_in (abfd
, erela
, irela
);
4626 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4627 irela
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4628 ELF_R_TYPE (irela
[j
].r_info
));
4630 if (bed
->s
->swap_reloca_out
)
4631 (*bed
->s
->swap_reloca_out
) (abfd
, irela
, (bfd_byte
*) erela
);
4633 elf_swap_reloca_out (abfd
, irela
, erela
);
4641 struct elf_link_sort_rela
{
4643 enum elf_reloc_type_class type
;
4645 Elf_Internal_Rel rel
;
4646 Elf_Internal_Rela rela
;
4651 elf_link_sort_cmp1 (A
, B
)
4655 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4656 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4657 int relativea
, relativeb
;
4659 relativea
= a
->type
== reloc_class_relative
;
4660 relativeb
= b
->type
== reloc_class_relative
;
4662 if (relativea
< relativeb
)
4664 if (relativea
> relativeb
)
4666 if (ELF_R_SYM (a
->u
.rel
.r_info
) < ELF_R_SYM (b
->u
.rel
.r_info
))
4668 if (ELF_R_SYM (a
->u
.rel
.r_info
) > ELF_R_SYM (b
->u
.rel
.r_info
))
4670 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4672 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4678 elf_link_sort_cmp2 (A
, B
)
4682 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4683 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4686 if (a
->offset
< b
->offset
)
4688 if (a
->offset
> b
->offset
)
4690 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
4691 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
4696 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4698 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4704 elf_link_sort_relocs (abfd
, info
, psec
)
4706 struct bfd_link_info
*info
;
4709 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4710 asection
*reldyn
, *o
;
4711 boolean rel
= false;
4712 bfd_size_type count
, size
;
4714 struct elf_link_sort_rela
*rela
;
4715 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4717 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
4718 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4720 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
4721 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4724 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rel
);
4727 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rela
);
4730 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4731 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4732 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4733 && o
->output_section
== reldyn
)
4734 size
+= o
->_raw_size
;
4736 if (size
!= reldyn
->_raw_size
)
4739 rela
= (struct elf_link_sort_rela
*) bfd_zmalloc (sizeof (*rela
) * count
);
4742 (*info
->callbacks
->warning
)
4743 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0,
4748 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4749 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4750 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4751 && o
->output_section
== reldyn
)
4755 Elf_External_Rel
*erel
, *erelend
;
4756 struct elf_link_sort_rela
*s
;
4758 erel
= (Elf_External_Rel
*) o
->contents
;
4759 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4760 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4761 for (; erel
< erelend
; erel
++, s
++)
4763 if (bed
->s
->swap_reloc_in
)
4764 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, &s
->u
.rel
);
4766 elf_swap_reloc_in (abfd
, erel
, &s
->u
.rel
);
4768 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4773 Elf_External_Rela
*erela
, *erelaend
;
4774 struct elf_link_sort_rela
*s
;
4776 erela
= (Elf_External_Rela
*) o
->contents
;
4777 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4778 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4779 for (; erela
< erelaend
; erela
++, s
++)
4781 if (bed
->s
->swap_reloca_in
)
4782 (*bed
->s
->swap_reloca_in
) (dynobj
, (bfd_byte
*) erela
,
4785 elf_swap_reloca_in (dynobj
, erela
, &s
->u
.rela
);
4787 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4792 qsort (rela
, (size_t) count
, sizeof (*rela
), elf_link_sort_cmp1
);
4793 for (ret
= 0; ret
< count
&& rela
[ret
].type
== reloc_class_relative
; ret
++)
4795 for (i
= ret
, j
= ret
; i
< count
; i
++)
4797 if (ELF_R_SYM (rela
[i
].u
.rel
.r_info
) != ELF_R_SYM (rela
[j
].u
.rel
.r_info
))
4799 rela
[i
].offset
= rela
[j
].u
.rel
.r_offset
;
4801 qsort (rela
+ ret
, (size_t) count
- ret
, sizeof (*rela
), elf_link_sort_cmp2
);
4803 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4804 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4805 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4806 && o
->output_section
== reldyn
)
4810 Elf_External_Rel
*erel
, *erelend
;
4811 struct elf_link_sort_rela
*s
;
4813 erel
= (Elf_External_Rel
*) o
->contents
;
4814 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4815 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4816 for (; erel
< erelend
; erel
++, s
++)
4818 if (bed
->s
->swap_reloc_out
)
4819 (*bed
->s
->swap_reloc_out
) (abfd
, &s
->u
.rel
,
4822 elf_swap_reloc_out (abfd
, &s
->u
.rel
, erel
);
4827 Elf_External_Rela
*erela
, *erelaend
;
4828 struct elf_link_sort_rela
*s
;
4830 erela
= (Elf_External_Rela
*) o
->contents
;
4831 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4832 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4833 for (; erela
< erelaend
; erela
++, s
++)
4835 if (bed
->s
->swap_reloca_out
)
4836 (*bed
->s
->swap_reloca_out
) (dynobj
, &s
->u
.rela
,
4837 (bfd_byte
*) erela
);
4839 elf_swap_reloca_out (dynobj
, &s
->u
.rela
, erela
);
4849 /* Do the final step of an ELF link. */
4852 elf_bfd_final_link (abfd
, info
)
4854 struct bfd_link_info
*info
;
4857 boolean emit_relocs
;
4859 struct elf_final_link_info finfo
;
4860 register asection
*o
;
4861 register struct bfd_link_order
*p
;
4863 bfd_size_type max_contents_size
;
4864 bfd_size_type max_external_reloc_size
;
4865 bfd_size_type max_internal_reloc_count
;
4866 bfd_size_type max_sym_count
;
4867 bfd_size_type max_sym_shndx_count
;
4869 Elf_Internal_Sym elfsym
;
4871 Elf_Internal_Shdr
*symtab_hdr
;
4872 Elf_Internal_Shdr
*symstrtab_hdr
;
4873 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4874 struct elf_outext_info eoinfo
;
4876 size_t relativecount
= 0;
4877 asection
*reldyn
= 0;
4880 if (! is_elf_hash_table (info
))
4884 abfd
->flags
|= DYNAMIC
;
4886 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4887 dynobj
= elf_hash_table (info
)->dynobj
;
4889 emit_relocs
= (info
->relocateable
4890 || info
->emitrelocations
4891 || bed
->elf_backend_emit_relocs
);
4894 finfo
.output_bfd
= abfd
;
4895 finfo
.symstrtab
= elf_stringtab_init ();
4896 if (finfo
.symstrtab
== NULL
)
4901 finfo
.dynsym_sec
= NULL
;
4902 finfo
.hash_sec
= NULL
;
4903 finfo
.symver_sec
= NULL
;
4907 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4908 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4909 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4910 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4911 /* Note that it is OK if symver_sec is NULL. */
4914 finfo
.contents
= NULL
;
4915 finfo
.external_relocs
= NULL
;
4916 finfo
.internal_relocs
= NULL
;
4917 finfo
.external_syms
= NULL
;
4918 finfo
.locsym_shndx
= NULL
;
4919 finfo
.internal_syms
= NULL
;
4920 finfo
.indices
= NULL
;
4921 finfo
.sections
= NULL
;
4922 finfo
.symbuf
= NULL
;
4923 finfo
.symshndxbuf
= NULL
;
4924 finfo
.symbuf_count
= 0;
4925 finfo
.first_tls_sec
= NULL
;
4926 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4927 if ((o
->flags
& SEC_THREAD_LOCAL
) != 0
4928 && (o
->flags
& SEC_LOAD
) != 0)
4930 finfo
.first_tls_sec
= o
;
4934 /* Count up the number of relocations we will output for each output
4935 section, so that we know the sizes of the reloc sections. We
4936 also figure out some maximum sizes. */
4937 max_contents_size
= 0;
4938 max_external_reloc_size
= 0;
4939 max_internal_reloc_count
= 0;
4941 max_sym_shndx_count
= 0;
4943 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4947 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4949 if (p
->type
== bfd_section_reloc_link_order
4950 || p
->type
== bfd_symbol_reloc_link_order
)
4952 else if (p
->type
== bfd_indirect_link_order
)
4956 sec
= p
->u
.indirect
.section
;
4958 /* Mark all sections which are to be included in the
4959 link. This will normally be every section. We need
4960 to do this so that we can identify any sections which
4961 the linker has decided to not include. */
4962 sec
->linker_mark
= true;
4964 if (sec
->flags
& SEC_MERGE
)
4967 if (info
->relocateable
|| info
->emitrelocations
)
4968 o
->reloc_count
+= sec
->reloc_count
;
4969 else if (bed
->elf_backend_count_relocs
)
4971 Elf_Internal_Rela
* relocs
;
4973 relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4974 (abfd
, sec
, (PTR
) NULL
,
4975 (Elf_Internal_Rela
*) NULL
, info
->keep_memory
));
4978 += (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
4980 if (elf_section_data (o
)->relocs
!= relocs
)
4984 if (sec
->_raw_size
> max_contents_size
)
4985 max_contents_size
= sec
->_raw_size
;
4986 if (sec
->_cooked_size
> max_contents_size
)
4987 max_contents_size
= sec
->_cooked_size
;
4989 /* We are interested in just local symbols, not all
4991 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4992 && (sec
->owner
->flags
& DYNAMIC
) == 0)
4996 if (elf_bad_symtab (sec
->owner
))
4997 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4998 / sizeof (Elf_External_Sym
));
5000 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
5002 if (sym_count
> max_sym_count
)
5003 max_sym_count
= sym_count
;
5005 if (sym_count
> max_sym_shndx_count
5006 && elf_symtab_shndx (sec
->owner
) != 0)
5007 max_sym_shndx_count
= sym_count
;
5009 if ((sec
->flags
& SEC_RELOC
) != 0)
5013 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
5014 if (ext_size
> max_external_reloc_size
)
5015 max_external_reloc_size
= ext_size
;
5016 if (sec
->reloc_count
> max_internal_reloc_count
)
5017 max_internal_reloc_count
= sec
->reloc_count
;
5023 if (o
->reloc_count
> 0)
5024 o
->flags
|= SEC_RELOC
;
5027 /* Explicitly clear the SEC_RELOC flag. The linker tends to
5028 set it (this is probably a bug) and if it is set
5029 assign_section_numbers will create a reloc section. */
5030 o
->flags
&=~ SEC_RELOC
;
5033 /* If the SEC_ALLOC flag is not set, force the section VMA to
5034 zero. This is done in elf_fake_sections as well, but forcing
5035 the VMA to 0 here will ensure that relocs against these
5036 sections are handled correctly. */
5037 if ((o
->flags
& SEC_ALLOC
) == 0
5038 && ! o
->user_set_vma
)
5042 if (! info
->relocateable
&& merged
)
5043 elf_link_hash_traverse (elf_hash_table (info
),
5044 elf_link_sec_merge_syms
, (PTR
) abfd
);
5046 /* Figure out the file positions for everything but the symbol table
5047 and the relocs. We set symcount to force assign_section_numbers
5048 to create a symbol table. */
5049 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
5050 BFD_ASSERT (! abfd
->output_has_begun
);
5051 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
5054 /* Figure out how many relocations we will have in each section.
5055 Just using RELOC_COUNT isn't good enough since that doesn't
5056 maintain a separate value for REL vs. RELA relocations. */
5058 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5059 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5061 asection
*output_section
;
5063 if (! o
->linker_mark
)
5065 /* This section was omitted from the link. */
5069 output_section
= o
->output_section
;
5071 if (output_section
!= NULL
5072 && (o
->flags
& SEC_RELOC
) != 0)
5074 struct bfd_elf_section_data
*esdi
5075 = elf_section_data (o
);
5076 struct bfd_elf_section_data
*esdo
5077 = elf_section_data (output_section
);
5078 unsigned int *rel_count
;
5079 unsigned int *rel_count2
;
5080 bfd_size_type entsize
;
5081 bfd_size_type entsize2
;
5083 /* We must be careful to add the relocations from the
5084 input section to the right output count. */
5085 entsize
= esdi
->rel_hdr
.sh_entsize
;
5086 entsize2
= esdi
->rel_hdr2
? esdi
->rel_hdr2
->sh_entsize
: 0;
5087 BFD_ASSERT ((entsize
== sizeof (Elf_External_Rel
)
5088 || entsize
== sizeof (Elf_External_Rela
))
5089 && entsize2
!= entsize
5091 || entsize2
== sizeof (Elf_External_Rel
)
5092 || entsize2
== sizeof (Elf_External_Rela
)));
5093 if (entsize
== esdo
->rel_hdr
.sh_entsize
)
5095 rel_count
= &esdo
->rel_count
;
5096 rel_count2
= &esdo
->rel_count2
;
5100 rel_count
= &esdo
->rel_count2
;
5101 rel_count2
= &esdo
->rel_count
;
5104 *rel_count
+= NUM_SHDR_ENTRIES (& esdi
->rel_hdr
);
5106 *rel_count2
+= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
5107 output_section
->flags
|= SEC_RELOC
;
5111 /* That created the reloc sections. Set their sizes, and assign
5112 them file positions, and allocate some buffers. */
5113 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5115 if ((o
->flags
& SEC_RELOC
) != 0)
5117 if (!elf_link_size_reloc_section (abfd
,
5118 &elf_section_data (o
)->rel_hdr
,
5122 if (elf_section_data (o
)->rel_hdr2
5123 && !elf_link_size_reloc_section (abfd
,
5124 elf_section_data (o
)->rel_hdr2
,
5129 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5130 to count upwards while actually outputting the relocations. */
5131 elf_section_data (o
)->rel_count
= 0;
5132 elf_section_data (o
)->rel_count2
= 0;
5135 _bfd_elf_assign_file_positions_for_relocs (abfd
);
5137 /* We have now assigned file positions for all the sections except
5138 .symtab and .strtab. We start the .symtab section at the current
5139 file position, and write directly to it. We build the .strtab
5140 section in memory. */
5141 bfd_get_symcount (abfd
) = 0;
5142 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
5143 /* sh_name is set in prep_headers. */
5144 symtab_hdr
->sh_type
= SHT_SYMTAB
;
5145 symtab_hdr
->sh_flags
= 0;
5146 symtab_hdr
->sh_addr
= 0;
5147 symtab_hdr
->sh_size
= 0;
5148 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
5149 /* sh_link is set in assign_section_numbers. */
5150 /* sh_info is set below. */
5151 /* sh_offset is set just below. */
5152 symtab_hdr
->sh_addralign
= bed
->s
->file_align
;
5154 off
= elf_tdata (abfd
)->next_file_pos
;
5155 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
5157 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5158 incorrect. We do not yet know the size of the .symtab section.
5159 We correct next_file_pos below, after we do know the size. */
5161 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5162 continuously seeking to the right position in the file. */
5163 if (! info
->keep_memory
|| max_sym_count
< 20)
5164 finfo
.symbuf_size
= 20;
5166 finfo
.symbuf_size
= max_sym_count
;
5167 amt
= finfo
.symbuf_size
;
5168 amt
*= sizeof (Elf_External_Sym
);
5169 finfo
.symbuf
= (Elf_External_Sym
*) bfd_malloc (amt
);
5170 if (finfo
.symbuf
== NULL
)
5172 if (elf_numsections (abfd
) > SHN_LORESERVE
)
5174 amt
= finfo
.symbuf_size
;
5175 amt
*= sizeof (Elf_External_Sym_Shndx
);
5176 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5177 if (finfo
.symshndxbuf
== NULL
)
5181 /* Start writing out the symbol table. The first symbol is always a
5183 if (info
->strip
!= strip_all
5186 elfsym
.st_value
= 0;
5189 elfsym
.st_other
= 0;
5190 elfsym
.st_shndx
= SHN_UNDEF
;
5191 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5192 &elfsym
, bfd_und_section_ptr
))
5197 /* Some standard ELF linkers do this, but we don't because it causes
5198 bootstrap comparison failures. */
5199 /* Output a file symbol for the output file as the second symbol.
5200 We output this even if we are discarding local symbols, although
5201 I'm not sure if this is correct. */
5202 elfsym
.st_value
= 0;
5204 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
5205 elfsym
.st_other
= 0;
5206 elfsym
.st_shndx
= SHN_ABS
;
5207 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
5208 &elfsym
, bfd_abs_section_ptr
))
5212 /* Output a symbol for each section. We output these even if we are
5213 discarding local symbols, since they are used for relocs. These
5214 symbols have no names. We store the index of each one in the
5215 index field of the section, so that we can find it again when
5216 outputting relocs. */
5217 if (info
->strip
!= strip_all
5221 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5222 elfsym
.st_other
= 0;
5223 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5225 o
= section_from_elf_index (abfd
, i
);
5227 o
->target_index
= bfd_get_symcount (abfd
);
5228 elfsym
.st_shndx
= i
;
5229 if (info
->relocateable
|| o
== NULL
)
5230 elfsym
.st_value
= 0;
5232 elfsym
.st_value
= o
->vma
;
5233 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5236 if (i
== SHN_LORESERVE
)
5237 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
5241 /* Allocate some memory to hold information read in from the input
5243 if (max_contents_size
!= 0)
5245 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
5246 if (finfo
.contents
== NULL
)
5250 if (max_external_reloc_size
!= 0)
5252 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
5253 if (finfo
.external_relocs
== NULL
)
5257 if (max_internal_reloc_count
!= 0)
5259 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5260 amt
*= sizeof (Elf_Internal_Rela
);
5261 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
5262 if (finfo
.internal_relocs
== NULL
)
5266 if (max_sym_count
!= 0)
5268 amt
= max_sym_count
* sizeof (Elf_External_Sym
);
5269 finfo
.external_syms
= (Elf_External_Sym
*) bfd_malloc (amt
);
5270 if (finfo
.external_syms
== NULL
)
5273 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
5274 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
5275 if (finfo
.internal_syms
== NULL
)
5278 amt
= max_sym_count
* sizeof (long);
5279 finfo
.indices
= (long *) bfd_malloc (amt
);
5280 if (finfo
.indices
== NULL
)
5283 amt
= max_sym_count
* sizeof (asection
*);
5284 finfo
.sections
= (asection
**) bfd_malloc (amt
);
5285 if (finfo
.sections
== NULL
)
5289 if (max_sym_shndx_count
!= 0)
5291 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
5292 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5293 if (finfo
.locsym_shndx
== NULL
)
5297 if (finfo
.first_tls_sec
)
5299 unsigned int align
= 0;
5300 bfd_vma base
= finfo
.first_tls_sec
->vma
, end
= 0;
5303 for (sec
= finfo
.first_tls_sec
;
5304 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
5307 bfd_vma size
= sec
->_raw_size
;
5309 if (bfd_get_section_alignment (abfd
, sec
) > align
)
5310 align
= bfd_get_section_alignment (abfd
, sec
);
5311 if (sec
->_raw_size
== 0 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
5313 struct bfd_link_order
*o
;
5316 for (o
= sec
->link_order_head
; o
!= NULL
; o
= o
->next
)
5317 if (size
< o
->offset
+ o
->size
)
5318 size
= o
->offset
+ o
->size
;
5320 end
= sec
->vma
+ size
;
5322 elf_hash_table (info
)->tls_segment
5323 = bfd_zalloc (abfd
, sizeof (struct elf_link_tls_segment
));
5324 if (elf_hash_table (info
)->tls_segment
== NULL
)
5326 elf_hash_table (info
)->tls_segment
->start
= base
;
5327 elf_hash_table (info
)->tls_segment
->size
= end
- base
;
5328 elf_hash_table (info
)->tls_segment
->align
= align
;
5331 /* Since ELF permits relocations to be against local symbols, we
5332 must have the local symbols available when we do the relocations.
5333 Since we would rather only read the local symbols once, and we
5334 would rather not keep them in memory, we handle all the
5335 relocations for a single input file at the same time.
5337 Unfortunately, there is no way to know the total number of local
5338 symbols until we have seen all of them, and the local symbol
5339 indices precede the global symbol indices. This means that when
5340 we are generating relocateable output, and we see a reloc against
5341 a global symbol, we can not know the symbol index until we have
5342 finished examining all the local symbols to see which ones we are
5343 going to output. To deal with this, we keep the relocations in
5344 memory, and don't output them until the end of the link. This is
5345 an unfortunate waste of memory, but I don't see a good way around
5346 it. Fortunately, it only happens when performing a relocateable
5347 link, which is not the common case. FIXME: If keep_memory is set
5348 we could write the relocs out and then read them again; I don't
5349 know how bad the memory loss will be. */
5351 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5352 sub
->output_has_begun
= false;
5353 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5355 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
5357 if (p
->type
== bfd_indirect_link_order
5358 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
5359 == bfd_target_elf_flavour
)
5360 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
5362 if (! sub
->output_has_begun
)
5364 if (! elf_link_input_bfd (&finfo
, sub
))
5366 sub
->output_has_begun
= true;
5369 else if (p
->type
== bfd_section_reloc_link_order
5370 || p
->type
== bfd_symbol_reloc_link_order
)
5372 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
5377 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
5383 /* Output any global symbols that got converted to local in a
5384 version script or due to symbol visibility. We do this in a
5385 separate step since ELF requires all local symbols to appear
5386 prior to any global symbols. FIXME: We should only do this if
5387 some global symbols were, in fact, converted to become local.
5388 FIXME: Will this work correctly with the Irix 5 linker? */
5389 eoinfo
.failed
= false;
5390 eoinfo
.finfo
= &finfo
;
5391 eoinfo
.localsyms
= true;
5392 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5397 /* That wrote out all the local symbols. Finish up the symbol table
5398 with the global symbols. Even if we want to strip everything we
5399 can, we still need to deal with those global symbols that got
5400 converted to local in a version script. */
5402 /* The sh_info field records the index of the first non local symbol. */
5403 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
5406 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
5408 Elf_Internal_Sym sym
;
5409 Elf_External_Sym
*dynsym
=
5410 (Elf_External_Sym
*) finfo
.dynsym_sec
->contents
;
5411 long last_local
= 0;
5413 /* Write out the section symbols for the output sections. */
5420 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5423 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5426 Elf_External_Sym
*dest
;
5428 indx
= elf_section_data (s
)->this_idx
;
5429 BFD_ASSERT (indx
> 0);
5430 sym
.st_shndx
= indx
;
5431 sym
.st_value
= s
->vma
;
5432 dest
= dynsym
+ elf_section_data (s
)->dynindx
;
5433 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5436 last_local
= bfd_count_sections (abfd
);
5439 /* Write out the local dynsyms. */
5440 if (elf_hash_table (info
)->dynlocal
)
5442 struct elf_link_local_dynamic_entry
*e
;
5443 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
5446 Elf_External_Sym
*dest
;
5448 sym
.st_size
= e
->isym
.st_size
;
5449 sym
.st_other
= e
->isym
.st_other
;
5451 /* Copy the internal symbol as is.
5452 Note that we saved a word of storage and overwrote
5453 the original st_name with the dynstr_index. */
5456 if (e
->isym
.st_shndx
!= SHN_UNDEF
5457 && (e
->isym
.st_shndx
< SHN_LORESERVE
5458 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
5460 s
= bfd_section_from_elf_index (e
->input_bfd
,
5464 elf_section_data (s
->output_section
)->this_idx
;
5465 sym
.st_value
= (s
->output_section
->vma
5467 + e
->isym
.st_value
);
5470 if (last_local
< e
->dynindx
)
5471 last_local
= e
->dynindx
;
5473 dest
= dynsym
+ e
->dynindx
;
5474 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5478 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
5482 /* We get the global symbols from the hash table. */
5483 eoinfo
.failed
= false;
5484 eoinfo
.localsyms
= false;
5485 eoinfo
.finfo
= &finfo
;
5486 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5491 /* If backend needs to output some symbols not present in the hash
5492 table, do it now. */
5493 if (bed
->elf_backend_output_arch_syms
)
5495 typedef boolean (*out_sym_func
) PARAMS ((PTR
, const char *,
5499 if (! ((*bed
->elf_backend_output_arch_syms
)
5500 (abfd
, info
, (PTR
) &finfo
, (out_sym_func
) elf_link_output_sym
)))
5504 /* Flush all symbols to the file. */
5505 if (! elf_link_flush_output_syms (&finfo
))
5508 /* Now we know the size of the symtab section. */
5509 off
+= symtab_hdr
->sh_size
;
5511 /* Finish up and write out the symbol string table (.strtab)
5513 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
5514 /* sh_name was set in prep_headers. */
5515 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
5516 symstrtab_hdr
->sh_flags
= 0;
5517 symstrtab_hdr
->sh_addr
= 0;
5518 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
5519 symstrtab_hdr
->sh_entsize
= 0;
5520 symstrtab_hdr
->sh_link
= 0;
5521 symstrtab_hdr
->sh_info
= 0;
5522 /* sh_offset is set just below. */
5523 symstrtab_hdr
->sh_addralign
= 1;
5525 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
5526 elf_tdata (abfd
)->next_file_pos
= off
;
5528 if (bfd_get_symcount (abfd
) > 0)
5530 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
5531 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
5535 /* Adjust the relocs to have the correct symbol indices. */
5536 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5538 if ((o
->flags
& SEC_RELOC
) == 0)
5541 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
5542 elf_section_data (o
)->rel_count
,
5543 elf_section_data (o
)->rel_hashes
);
5544 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
5545 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
5546 elf_section_data (o
)->rel_count2
,
5547 (elf_section_data (o
)->rel_hashes
5548 + elf_section_data (o
)->rel_count
));
5550 /* Set the reloc_count field to 0 to prevent write_relocs from
5551 trying to swap the relocs out itself. */
5555 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
5556 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
5558 /* If we are linking against a dynamic object, or generating a
5559 shared library, finish up the dynamic linking information. */
5562 Elf_External_Dyn
*dyncon
, *dynconend
;
5564 /* Fix up .dynamic entries. */
5565 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
5566 BFD_ASSERT (o
!= NULL
);
5568 dyncon
= (Elf_External_Dyn
*) o
->contents
;
5569 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
5570 for (; dyncon
< dynconend
; dyncon
++)
5572 Elf_Internal_Dyn dyn
;
5576 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
5583 if (relativecount
> 0 && dyncon
+ 1 < dynconend
)
5585 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
5587 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
5588 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
5591 if (dyn
.d_tag
!= DT_NULL
)
5593 dyn
.d_un
.d_val
= relativecount
;
5594 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5600 name
= info
->init_function
;
5603 name
= info
->fini_function
;
5606 struct elf_link_hash_entry
*h
;
5608 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
5609 false, false, true);
5611 && (h
->root
.type
== bfd_link_hash_defined
5612 || h
->root
.type
== bfd_link_hash_defweak
))
5614 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
5615 o
= h
->root
.u
.def
.section
;
5616 if (o
->output_section
!= NULL
)
5617 dyn
.d_un
.d_val
+= (o
->output_section
->vma
5618 + o
->output_offset
);
5621 /* The symbol is imported from another shared
5622 library and does not apply to this one. */
5626 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5631 case DT_PREINIT_ARRAYSZ
:
5632 name
= ".preinit_array";
5634 case DT_INIT_ARRAYSZ
:
5635 name
= ".init_array";
5637 case DT_FINI_ARRAYSZ
:
5638 name
= ".fini_array";
5640 o
= bfd_get_section_by_name (abfd
, name
);
5643 (*_bfd_error_handler
)
5644 (_("%s: could not find output section %s"),
5645 bfd_get_filename (abfd
), name
);
5648 if (o
->_raw_size
== 0)
5649 (*_bfd_error_handler
)
5650 (_("warning: %s section has zero size"), name
);
5651 dyn
.d_un
.d_val
= o
->_raw_size
;
5652 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5655 case DT_PREINIT_ARRAY
:
5656 name
= ".preinit_array";
5659 name
= ".init_array";
5662 name
= ".fini_array";
5675 name
= ".gnu.version_d";
5678 name
= ".gnu.version_r";
5681 name
= ".gnu.version";
5683 o
= bfd_get_section_by_name (abfd
, name
);
5686 (*_bfd_error_handler
)
5687 (_("%s: could not find output section %s"),
5688 bfd_get_filename (abfd
), name
);
5691 dyn
.d_un
.d_ptr
= o
->vma
;
5692 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5699 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
5704 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5706 Elf_Internal_Shdr
*hdr
;
5708 hdr
= elf_elfsections (abfd
)[i
];
5709 if (hdr
->sh_type
== type
5710 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
5712 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
5713 dyn
.d_un
.d_val
+= hdr
->sh_size
;
5716 if (dyn
.d_un
.d_val
== 0
5717 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
5718 dyn
.d_un
.d_val
= hdr
->sh_addr
;
5722 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5728 /* If we have created any dynamic sections, then output them. */
5731 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
5734 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
5736 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5737 || o
->_raw_size
== 0
5738 || o
->output_section
== bfd_abs_section_ptr
)
5740 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
5742 /* At this point, we are only interested in sections
5743 created by elf_link_create_dynamic_sections. */
5746 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
5748 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
5750 if (! bfd_set_section_contents (abfd
, o
->output_section
,
5752 (file_ptr
) o
->output_offset
,
5758 /* The contents of the .dynstr section are actually in a
5760 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
5761 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
5762 || ! _bfd_elf_strtab_emit (abfd
,
5763 elf_hash_table (info
)->dynstr
))
5769 if (info
->relocateable
)
5771 boolean failed
= false;
5773 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
5778 /* If we have optimized stabs strings, output them. */
5779 if (elf_hash_table (info
)->stab_info
!= NULL
)
5781 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
5785 if (info
->eh_frame_hdr
&& elf_hash_table (info
)->dynobj
)
5787 o
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5790 && (elf_section_data (o
)->sec_info_type
5791 == ELF_INFO_TYPE_EH_FRAME_HDR
))
5793 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, o
))
5798 if (finfo
.symstrtab
!= NULL
)
5799 _bfd_stringtab_free (finfo
.symstrtab
);
5800 if (finfo
.contents
!= NULL
)
5801 free (finfo
.contents
);
5802 if (finfo
.external_relocs
!= NULL
)
5803 free (finfo
.external_relocs
);
5804 if (finfo
.internal_relocs
!= NULL
)
5805 free (finfo
.internal_relocs
);
5806 if (finfo
.external_syms
!= NULL
)
5807 free (finfo
.external_syms
);
5808 if (finfo
.locsym_shndx
!= NULL
)
5809 free (finfo
.locsym_shndx
);
5810 if (finfo
.internal_syms
!= NULL
)
5811 free (finfo
.internal_syms
);
5812 if (finfo
.indices
!= NULL
)
5813 free (finfo
.indices
);
5814 if (finfo
.sections
!= NULL
)
5815 free (finfo
.sections
);
5816 if (finfo
.symbuf
!= NULL
)
5817 free (finfo
.symbuf
);
5818 if (finfo
.symshndxbuf
!= NULL
)
5819 free (finfo
.symbuf
);
5820 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5822 if ((o
->flags
& SEC_RELOC
) != 0
5823 && elf_section_data (o
)->rel_hashes
!= NULL
)
5824 free (elf_section_data (o
)->rel_hashes
);
5827 elf_tdata (abfd
)->linker
= true;
5832 if (finfo
.symstrtab
!= NULL
)
5833 _bfd_stringtab_free (finfo
.symstrtab
);
5834 if (finfo
.contents
!= NULL
)
5835 free (finfo
.contents
);
5836 if (finfo
.external_relocs
!= NULL
)
5837 free (finfo
.external_relocs
);
5838 if (finfo
.internal_relocs
!= NULL
)
5839 free (finfo
.internal_relocs
);
5840 if (finfo
.external_syms
!= NULL
)
5841 free (finfo
.external_syms
);
5842 if (finfo
.locsym_shndx
!= NULL
)
5843 free (finfo
.locsym_shndx
);
5844 if (finfo
.internal_syms
!= NULL
)
5845 free (finfo
.internal_syms
);
5846 if (finfo
.indices
!= NULL
)
5847 free (finfo
.indices
);
5848 if (finfo
.sections
!= NULL
)
5849 free (finfo
.sections
);
5850 if (finfo
.symbuf
!= NULL
)
5851 free (finfo
.symbuf
);
5852 if (finfo
.symshndxbuf
!= NULL
)
5853 free (finfo
.symbuf
);
5854 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5856 if ((o
->flags
& SEC_RELOC
) != 0
5857 && elf_section_data (o
)->rel_hashes
!= NULL
)
5858 free (elf_section_data (o
)->rel_hashes
);
5864 /* Add a symbol to the output symbol table. */
5867 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
5868 struct elf_final_link_info
*finfo
;
5870 Elf_Internal_Sym
*elfsym
;
5871 asection
*input_sec
;
5873 Elf_External_Sym
*dest
;
5874 Elf_External_Sym_Shndx
*destshndx
;
5876 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
5877 struct bfd_link_info
*info
,
5882 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
5883 elf_backend_link_output_symbol_hook
;
5884 if (output_symbol_hook
!= NULL
)
5886 if (! ((*output_symbol_hook
)
5887 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
5891 if (name
== (const char *) NULL
|| *name
== '\0')
5892 elfsym
->st_name
= 0;
5893 else if (input_sec
->flags
& SEC_EXCLUDE
)
5894 elfsym
->st_name
= 0;
5897 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5899 if (elfsym
->st_name
== (unsigned long) -1)
5903 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5905 if (! elf_link_flush_output_syms (finfo
))
5909 dest
= finfo
->symbuf
+ finfo
->symbuf_count
;
5910 destshndx
= finfo
->symshndxbuf
;
5911 if (destshndx
!= NULL
)
5912 destshndx
+= finfo
->symbuf_count
;
5913 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
, (PTR
) dest
, (PTR
) destshndx
);
5914 ++finfo
->symbuf_count
;
5916 ++ bfd_get_symcount (finfo
->output_bfd
);
5921 /* Flush the output symbols to the file. */
5924 elf_link_flush_output_syms (finfo
)
5925 struct elf_final_link_info
*finfo
;
5927 if (finfo
->symbuf_count
> 0)
5929 Elf_Internal_Shdr
*hdr
;
5933 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5934 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5935 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
5936 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5937 || bfd_bwrite ((PTR
) finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
5940 hdr
->sh_size
+= amt
;
5942 if (finfo
->symshndxbuf
!= NULL
)
5944 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_shndx_hdr
;
5945 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5946 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym_Shndx
);
5947 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5948 || (bfd_bwrite ((PTR
) finfo
->symshndxbuf
, amt
, finfo
->output_bfd
)
5952 hdr
->sh_size
+= amt
;
5955 finfo
->symbuf_count
= 0;
5961 /* Adjust all external symbols pointing into SEC_MERGE sections
5962 to reflect the object merging within the sections. */
5965 elf_link_sec_merge_syms (h
, data
)
5966 struct elf_link_hash_entry
*h
;
5971 if (h
->root
.type
== bfd_link_hash_warning
)
5972 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5974 if ((h
->root
.type
== bfd_link_hash_defined
5975 || h
->root
.type
== bfd_link_hash_defweak
)
5976 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
5977 && elf_section_data (sec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
)
5979 bfd
*output_bfd
= (bfd
*) data
;
5981 h
->root
.u
.def
.value
=
5982 _bfd_merged_section_offset (output_bfd
,
5983 &h
->root
.u
.def
.section
,
5984 elf_section_data (sec
)->sec_info
,
5985 h
->root
.u
.def
.value
, (bfd_vma
) 0);
5991 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
5992 allowing an unsatisfied unversioned symbol in the DSO to match a
5993 versioned symbol that would normally require an explicit version. */
5996 elf_link_check_versioned_symbol (info
, h
)
5997 struct bfd_link_info
*info
;
5998 struct elf_link_hash_entry
*h
;
6000 bfd
*undef_bfd
= h
->root
.u
.undef
.abfd
;
6001 struct elf_link_loaded_list
*loaded
;
6003 if ((undef_bfd
->flags
& DYNAMIC
) == 0
6004 || info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
6005 || elf_dt_soname (h
->root
.u
.undef
.abfd
) == NULL
)
6008 for (loaded
= elf_hash_table (info
)->loaded
;
6010 loaded
= loaded
->next
)
6013 Elf_Internal_Shdr
*hdr
;
6014 bfd_size_type symcount
;
6015 bfd_size_type extsymcount
;
6016 bfd_size_type extsymoff
;
6017 Elf_Internal_Shdr
*versymhdr
;
6018 Elf_Internal_Sym
*isym
;
6019 Elf_Internal_Sym
*isymend
;
6020 Elf_Internal_Sym
*isymbuf
;
6021 Elf_External_Versym
*ever
;
6022 Elf_External_Versym
*extversym
;
6024 input
= loaded
->abfd
;
6026 /* We check each DSO for a possible hidden versioned definition. */
6027 if (input
== undef_bfd
6028 || (input
->flags
& DYNAMIC
) == 0
6029 || elf_dynversym (input
) == 0)
6032 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
6034 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6035 if (elf_bad_symtab (input
))
6037 extsymcount
= symcount
;
6042 extsymcount
= symcount
- hdr
->sh_info
;
6043 extsymoff
= hdr
->sh_info
;
6046 if (extsymcount
== 0)
6049 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
6051 if (isymbuf
== NULL
)
6054 /* Read in any version definitions. */
6055 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
6056 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
6057 if (extversym
== NULL
)
6060 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
6061 || (bfd_bread ((PTR
) extversym
, versymhdr
->sh_size
, input
)
6062 != versymhdr
->sh_size
))
6070 ever
= extversym
+ extsymoff
;
6071 isymend
= isymbuf
+ extsymcount
;
6072 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
6075 Elf_Internal_Versym iver
;
6077 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
6078 || isym
->st_shndx
== SHN_UNDEF
)
6081 name
= bfd_elf_string_from_elf_section (input
,
6084 if (strcmp (name
, h
->root
.root
.string
) != 0)
6087 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
6089 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
6091 /* If we have a non-hidden versioned sym, then it should
6092 have provided a definition for the undefined sym. */
6096 if ((iver
.vs_vers
& VERSYM_VERSION
) == 2)
6098 /* This is the oldest (default) sym. We can use it. */
6112 /* Add an external symbol to the symbol table. This is called from
6113 the hash table traversal routine. When generating a shared object,
6114 we go through the symbol table twice. The first time we output
6115 anything that might have been forced to local scope in a version
6116 script. The second time we output the symbols that are still
6120 elf_link_output_extsym (h
, data
)
6121 struct elf_link_hash_entry
*h
;
6124 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
6125 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
6127 Elf_Internal_Sym sym
;
6128 asection
*input_sec
;
6130 if (h
->root
.type
== bfd_link_hash_warning
)
6132 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6133 if (h
->root
.type
== bfd_link_hash_new
)
6137 /* Decide whether to output this symbol in this pass. */
6138 if (eoinfo
->localsyms
)
6140 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6145 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6149 /* If we are not creating a shared library, and this symbol is
6150 referenced by a shared library but is not defined anywhere, then
6151 warn that it is undefined. If we do not do this, the runtime
6152 linker will complain that the symbol is undefined when the
6153 program is run. We don't have to worry about symbols that are
6154 referenced by regular files, because we will already have issued
6155 warnings for them. */
6156 if (! finfo
->info
->relocateable
6157 && ! finfo
->info
->allow_shlib_undefined
6158 && ! finfo
->info
->shared
6159 && h
->root
.type
== bfd_link_hash_undefined
6160 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
6161 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
6162 && ! elf_link_check_versioned_symbol (finfo
->info
, h
))
6164 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6165 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
6166 (asection
*) NULL
, (bfd_vma
) 0, true)))
6168 eoinfo
->failed
= true;
6173 /* We don't want to output symbols that have never been mentioned by
6174 a regular file, or that we have been told to strip. However, if
6175 h->indx is set to -2, the symbol is used by a reloc and we must
6179 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
6180 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
6181 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
6182 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
6184 else if (finfo
->info
->strip
== strip_all
6185 || (finfo
->info
->strip
== strip_some
6186 && bfd_hash_lookup (finfo
->info
->keep_hash
,
6187 h
->root
.root
.string
,
6188 false, false) == NULL
))
6193 /* If we're stripping it, and it's not a dynamic symbol, there's
6194 nothing else to do unless it is a forced local symbol. */
6197 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6201 sym
.st_size
= h
->size
;
6202 sym
.st_other
= h
->other
;
6203 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6204 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6205 else if (h
->root
.type
== bfd_link_hash_undefweak
6206 || h
->root
.type
== bfd_link_hash_defweak
)
6207 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6209 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6211 switch (h
->root
.type
)
6214 case bfd_link_hash_new
:
6215 case bfd_link_hash_warning
:
6219 case bfd_link_hash_undefined
:
6220 case bfd_link_hash_undefweak
:
6221 input_sec
= bfd_und_section_ptr
;
6222 sym
.st_shndx
= SHN_UNDEF
;
6225 case bfd_link_hash_defined
:
6226 case bfd_link_hash_defweak
:
6228 input_sec
= h
->root
.u
.def
.section
;
6229 if (input_sec
->output_section
!= NULL
)
6232 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6233 input_sec
->output_section
);
6234 if (sym
.st_shndx
== SHN_BAD
)
6236 (*_bfd_error_handler
)
6237 (_("%s: could not find output section %s for input section %s"),
6238 bfd_get_filename (finfo
->output_bfd
),
6239 input_sec
->output_section
->name
,
6241 eoinfo
->failed
= true;
6245 /* ELF symbols in relocateable files are section relative,
6246 but in nonrelocateable files they are virtual
6248 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6249 if (! finfo
->info
->relocateable
)
6251 sym
.st_value
+= input_sec
->output_section
->vma
;
6252 if (h
->type
== STT_TLS
)
6254 /* STT_TLS symbols are relative to PT_TLS segment
6256 BFD_ASSERT (finfo
->first_tls_sec
!= NULL
);
6257 sym
.st_value
-= finfo
->first_tls_sec
->vma
;
6263 BFD_ASSERT (input_sec
->owner
== NULL
6264 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6265 sym
.st_shndx
= SHN_UNDEF
;
6266 input_sec
= bfd_und_section_ptr
;
6271 case bfd_link_hash_common
:
6272 input_sec
= h
->root
.u
.c
.p
->section
;
6273 sym
.st_shndx
= SHN_COMMON
;
6274 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6277 case bfd_link_hash_indirect
:
6278 /* These symbols are created by symbol versioning. They point
6279 to the decorated version of the name. For example, if the
6280 symbol foo@@GNU_1.2 is the default, which should be used when
6281 foo is used with no version, then we add an indirect symbol
6282 foo which points to foo@@GNU_1.2. We ignore these symbols,
6283 since the indirected symbol is already in the hash table. */
6287 /* Give the processor backend a chance to tweak the symbol value,
6288 and also to finish up anything that needs to be done for this
6289 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6290 forced local syms when non-shared is due to a historical quirk. */
6291 if ((h
->dynindx
!= -1
6292 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6293 && (finfo
->info
->shared
6294 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6295 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6297 struct elf_backend_data
*bed
;
6299 bed
= get_elf_backend_data (finfo
->output_bfd
);
6300 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6301 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6303 eoinfo
->failed
= true;
6308 /* If we are marking the symbol as undefined, and there are no
6309 non-weak references to this symbol from a regular object, then
6310 mark the symbol as weak undefined; if there are non-weak
6311 references, mark the symbol as strong. We can't do this earlier,
6312 because it might not be marked as undefined until the
6313 finish_dynamic_symbol routine gets through with it. */
6314 if (sym
.st_shndx
== SHN_UNDEF
6315 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6316 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6317 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6321 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6322 bindtype
= STB_GLOBAL
;
6324 bindtype
= STB_WEAK
;
6325 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6328 /* If a symbol is not defined locally, we clear the visibility
6330 if (! finfo
->info
->relocateable
6331 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6332 sym
.st_other
^= ELF_ST_VISIBILITY (sym
.st_other
);
6334 /* If this symbol should be put in the .dynsym section, then put it
6335 there now. We already know the symbol index. We also fill in
6336 the entry in the .hash section. */
6337 if (h
->dynindx
!= -1
6338 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6342 size_t hash_entry_size
;
6343 bfd_byte
*bucketpos
;
6345 Elf_External_Sym
*esym
;
6347 sym
.st_name
= h
->dynstr_index
;
6348 esym
= (Elf_External_Sym
*) finfo
->dynsym_sec
->contents
+ h
->dynindx
;
6349 elf_swap_symbol_out (finfo
->output_bfd
, &sym
, (PTR
) esym
, (PTR
) 0);
6351 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6352 bucket
= h
->elf_hash_value
% bucketcount
;
6354 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6355 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6356 + (bucket
+ 2) * hash_entry_size
);
6357 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6358 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, (bfd_vma
) h
->dynindx
,
6360 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6361 ((bfd_byte
*) finfo
->hash_sec
->contents
6362 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6364 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6366 Elf_Internal_Versym iversym
;
6367 Elf_External_Versym
*eversym
;
6369 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6371 if (h
->verinfo
.verdef
== NULL
)
6372 iversym
.vs_vers
= 0;
6374 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6378 if (h
->verinfo
.vertree
== NULL
)
6379 iversym
.vs_vers
= 1;
6381 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6384 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6385 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6387 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6388 eversym
+= h
->dynindx
;
6389 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6393 /* If we're stripping it, then it was just a dynamic symbol, and
6394 there's nothing else to do. */
6398 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6400 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
6402 eoinfo
->failed
= true;
6409 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6410 originated from the section given by INPUT_REL_HDR) to the
6414 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
6417 asection
*input_section
;
6418 Elf_Internal_Shdr
*input_rel_hdr
;
6419 Elf_Internal_Rela
*internal_relocs
;
6421 Elf_Internal_Rela
*irela
;
6422 Elf_Internal_Rela
*irelaend
;
6423 Elf_Internal_Shdr
*output_rel_hdr
;
6424 asection
*output_section
;
6425 unsigned int *rel_countp
= NULL
;
6426 struct elf_backend_data
*bed
;
6429 output_section
= input_section
->output_section
;
6430 output_rel_hdr
= NULL
;
6432 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
6433 == input_rel_hdr
->sh_entsize
)
6435 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
6436 rel_countp
= &elf_section_data (output_section
)->rel_count
;
6438 else if (elf_section_data (output_section
)->rel_hdr2
6439 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
6440 == input_rel_hdr
->sh_entsize
))
6442 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
6443 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
6447 (*_bfd_error_handler
) (
6448 _("%s: relocation size mismatch in %s section %s"),
6449 bfd_get_filename (output_bfd
),
6450 bfd_archive_filename (input_section
->owner
),
6451 input_section
->name
);
6452 bfd_set_error (bfd_error_wrong_object_format
);
6456 bed
= get_elf_backend_data (output_bfd
);
6457 irela
= internal_relocs
;
6458 irelaend
= irela
+ NUM_SHDR_ENTRIES (input_rel_hdr
)
6459 * bed
->s
->int_rels_per_ext_rel
;
6461 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
6463 Elf_External_Rel
*erel
;
6464 Elf_Internal_Rel
*irel
;
6466 amt
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
6467 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
6470 (*_bfd_error_handler
) (_("Error: out of memory"));
6474 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
6475 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erel
++)
6479 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
6481 irel
[i
].r_offset
= irela
[i
].r_offset
;
6482 irel
[i
].r_info
= irela
[i
].r_info
;
6483 BFD_ASSERT (irela
[i
].r_addend
== 0);
6486 if (bed
->s
->swap_reloc_out
)
6487 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (PTR
) erel
);
6489 elf_swap_reloc_out (output_bfd
, irel
, erel
);
6496 Elf_External_Rela
*erela
;
6498 BFD_ASSERT (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
6500 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
6501 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erela
++)
6502 if (bed
->s
->swap_reloca_out
)
6503 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (PTR
) erela
);
6505 elf_swap_reloca_out (output_bfd
, irela
, erela
);
6508 /* Bump the counter, so that we know where to add the next set of
6510 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
6515 /* Link an input file into the linker output file. This function
6516 handles all the sections and relocations of the input file at once.
6517 This is so that we only have to read the local symbols once, and
6518 don't have to keep them in memory. */
6521 elf_link_input_bfd (finfo
, input_bfd
)
6522 struct elf_final_link_info
*finfo
;
6525 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
6526 bfd
*, asection
*, bfd_byte
*,
6527 Elf_Internal_Rela
*,
6528 Elf_Internal_Sym
*, asection
**));
6530 Elf_Internal_Shdr
*symtab_hdr
;
6533 Elf_Internal_Sym
*isymbuf
;
6534 Elf_Internal_Sym
*isym
;
6535 Elf_Internal_Sym
*isymend
;
6537 asection
**ppsection
;
6539 struct elf_backend_data
*bed
;
6540 boolean emit_relocs
;
6541 struct elf_link_hash_entry
**sym_hashes
;
6543 output_bfd
= finfo
->output_bfd
;
6544 bed
= get_elf_backend_data (output_bfd
);
6545 relocate_section
= bed
->elf_backend_relocate_section
;
6547 /* If this is a dynamic object, we don't want to do anything here:
6548 we don't want the local symbols, and we don't want the section
6550 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6553 emit_relocs
= (finfo
->info
->relocateable
6554 || finfo
->info
->emitrelocations
6555 || bed
->elf_backend_emit_relocs
);
6557 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6558 if (elf_bad_symtab (input_bfd
))
6560 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6565 locsymcount
= symtab_hdr
->sh_info
;
6566 extsymoff
= symtab_hdr
->sh_info
;
6569 /* Read the local symbols. */
6570 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6571 if (isymbuf
== NULL
&& locsymcount
!= 0)
6573 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6574 finfo
->internal_syms
,
6575 finfo
->external_syms
,
6576 finfo
->locsym_shndx
);
6577 if (isymbuf
== NULL
)
6581 /* Find local symbol sections and adjust values of symbols in
6582 SEC_MERGE sections. Write out those local symbols we know are
6583 going into the output file. */
6584 isymend
= isymbuf
+ locsymcount
;
6585 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
6587 isym
++, pindex
++, ppsection
++)
6591 Elf_Internal_Sym osym
;
6595 if (elf_bad_symtab (input_bfd
))
6597 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6604 if (isym
->st_shndx
== SHN_UNDEF
)
6605 isec
= bfd_und_section_ptr
;
6606 else if (isym
->st_shndx
< SHN_LORESERVE
6607 || isym
->st_shndx
> SHN_HIRESERVE
)
6609 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
6611 && elf_section_data (isec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
6612 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6614 _bfd_merged_section_offset (output_bfd
, &isec
,
6615 elf_section_data (isec
)->sec_info
,
6616 isym
->st_value
, (bfd_vma
) 0);
6618 else if (isym
->st_shndx
== SHN_ABS
)
6619 isec
= bfd_abs_section_ptr
;
6620 else if (isym
->st_shndx
== SHN_COMMON
)
6621 isec
= bfd_com_section_ptr
;
6630 /* Don't output the first, undefined, symbol. */
6631 if (ppsection
== finfo
->sections
)
6634 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6636 /* We never output section symbols. Instead, we use the
6637 section symbol of the corresponding section in the output
6642 /* If we are stripping all symbols, we don't want to output this
6644 if (finfo
->info
->strip
== strip_all
)
6647 /* If we are discarding all local symbols, we don't want to
6648 output this one. If we are generating a relocateable output
6649 file, then some of the local symbols may be required by
6650 relocs; we output them below as we discover that they are
6652 if (finfo
->info
->discard
== discard_all
)
6655 /* If this symbol is defined in a section which we are
6656 discarding, we don't need to keep it, but note that
6657 linker_mark is only reliable for sections that have contents.
6658 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6659 as well as linker_mark. */
6660 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6662 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6663 || (! finfo
->info
->relocateable
6664 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6667 /* Get the name of the symbol. */
6668 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6673 /* See if we are discarding symbols with this name. */
6674 if ((finfo
->info
->strip
== strip_some
6675 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
6677 || (((finfo
->info
->discard
== discard_sec_merge
6678 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocateable
)
6679 || finfo
->info
->discard
== discard_l
)
6680 && bfd_is_local_label_name (input_bfd
, name
)))
6683 /* If we get here, we are going to output this symbol. */
6687 /* Adjust the section index for the output file. */
6688 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6689 isec
->output_section
);
6690 if (osym
.st_shndx
== SHN_BAD
)
6693 *pindex
= bfd_get_symcount (output_bfd
);
6695 /* ELF symbols in relocateable files are section relative, but
6696 in executable files they are virtual addresses. Note that
6697 this code assumes that all ELF sections have an associated
6698 BFD section with a reasonable value for output_offset; below
6699 we assume that they also have a reasonable value for
6700 output_section. Any special sections must be set up to meet
6701 these requirements. */
6702 osym
.st_value
+= isec
->output_offset
;
6703 if (! finfo
->info
->relocateable
)
6705 osym
.st_value
+= isec
->output_section
->vma
;
6706 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
6708 /* STT_TLS symbols are relative to PT_TLS segment base. */
6709 BFD_ASSERT (finfo
->first_tls_sec
!= NULL
);
6710 osym
.st_value
-= finfo
->first_tls_sec
->vma
;
6714 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
6718 /* Relocate the contents of each section. */
6719 sym_hashes
= elf_sym_hashes (input_bfd
);
6720 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6724 if (! o
->linker_mark
)
6726 /* This section was omitted from the link. */
6730 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6731 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6734 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6736 /* Section was created by elf_link_create_dynamic_sections
6741 /* Get the contents of the section. They have been cached by a
6742 relaxation routine. Note that o is a section in an input
6743 file, so the contents field will not have been set by any of
6744 the routines which work on output files. */
6745 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6746 contents
= elf_section_data (o
)->this_hdr
.contents
;
6749 contents
= finfo
->contents
;
6750 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
6751 (file_ptr
) 0, o
->_raw_size
))
6755 if ((o
->flags
& SEC_RELOC
) != 0)
6757 Elf_Internal_Rela
*internal_relocs
;
6759 /* Get the swapped relocs. */
6760 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6761 (input_bfd
, o
, finfo
->external_relocs
,
6762 finfo
->internal_relocs
, false));
6763 if (internal_relocs
== NULL
6764 && o
->reloc_count
> 0)
6767 /* Run through the relocs looking for any against symbols
6768 from discarded sections and section symbols from
6769 removed link-once sections. Complain about relocs
6770 against discarded sections. Zero relocs against removed
6771 link-once sections. We should really complain if
6772 anything in the final link tries to use it, but
6773 DWARF-based exception handling might have an entry in
6774 .eh_frame to describe a routine in the linkonce section,
6775 and it turns out to be hard to remove the .eh_frame
6776 entry too. FIXME. */
6777 if (!finfo
->info
->relocateable
6778 && !elf_section_ignore_discarded_relocs (o
))
6780 Elf_Internal_Rela
*rel
, *relend
;
6782 rel
= internal_relocs
;
6783 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6784 for ( ; rel
< relend
; rel
++)
6786 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6788 if (r_symndx
>= locsymcount
6789 || (elf_bad_symtab (input_bfd
)
6790 && finfo
->sections
[r_symndx
] == NULL
))
6792 struct elf_link_hash_entry
*h
;
6794 h
= sym_hashes
[r_symndx
- extsymoff
];
6795 while (h
->root
.type
== bfd_link_hash_indirect
6796 || h
->root
.type
== bfd_link_hash_warning
)
6797 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6799 /* Complain if the definition comes from a
6800 discarded section. */
6801 if ((h
->root
.type
== bfd_link_hash_defined
6802 || h
->root
.type
== bfd_link_hash_defweak
)
6803 && elf_discarded_section (h
->root
.u
.def
.section
))
6805 #if BFD_VERSION_DATE < 20031005
6806 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6808 #if BFD_VERSION_DATE > 20021005
6809 (*finfo
->info
->callbacks
->warning
)
6811 _("warning: relocation against removed section; zeroing"),
6812 NULL
, input_bfd
, o
, rel
->r_offset
);
6814 BFD_ASSERT (r_symndx
!= 0);
6815 memset (rel
, 0, sizeof (*rel
));
6820 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6821 (finfo
->info
, h
->root
.root
.string
,
6822 input_bfd
, o
, rel
->r_offset
,
6830 asection
*sec
= finfo
->sections
[r_symndx
];
6832 if (sec
!= NULL
&& elf_discarded_section (sec
))
6834 #if BFD_VERSION_DATE < 20031005
6835 if ((o
->flags
& SEC_DEBUGGING
) != 0
6836 || (sec
->flags
& SEC_LINK_ONCE
) != 0)
6838 #if BFD_VERSION_DATE > 20021005
6839 (*finfo
->info
->callbacks
->warning
)
6841 _("warning: relocation against removed section"),
6842 NULL
, input_bfd
, o
, rel
->r_offset
);
6844 BFD_ASSERT (r_symndx
!= 0);
6846 = ELF_R_INFO (0, ELF_R_TYPE (rel
->r_info
));
6854 = _("local symbols in discarded section %s");
6856 = strlen (sec
->name
) + strlen (msg
) - 1;
6857 char *buf
= (char *) bfd_malloc (amt
);
6860 sprintf (buf
, msg
, sec
->name
);
6862 buf
= (char *) sec
->name
;
6863 ok
= (*finfo
->info
->callbacks
6864 ->undefined_symbol
) (finfo
->info
, buf
,
6868 if (buf
!= sec
->name
)
6878 /* Relocate the section by invoking a back end routine.
6880 The back end routine is responsible for adjusting the
6881 section contents as necessary, and (if using Rela relocs
6882 and generating a relocateable output file) adjusting the
6883 reloc addend as necessary.
6885 The back end routine does not have to worry about setting
6886 the reloc address or the reloc symbol index.
6888 The back end routine is given a pointer to the swapped in
6889 internal symbols, and can access the hash table entries
6890 for the external symbols via elf_sym_hashes (input_bfd).
6892 When generating relocateable output, the back end routine
6893 must handle STB_LOCAL/STT_SECTION symbols specially. The
6894 output symbol is going to be a section symbol
6895 corresponding to the output section, which will require
6896 the addend to be adjusted. */
6898 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6899 input_bfd
, o
, contents
,
6907 Elf_Internal_Rela
*irela
;
6908 Elf_Internal_Rela
*irelaend
;
6909 struct elf_link_hash_entry
**rel_hash
;
6910 Elf_Internal_Shdr
*input_rel_hdr
;
6911 unsigned int next_erel
;
6912 boolean (*reloc_emitter
) PARAMS ((bfd
*, asection
*,
6913 Elf_Internal_Shdr
*,
6914 Elf_Internal_Rela
*));
6915 boolean rela_normal
;
6917 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6918 rela_normal
= (bed
->rela_normal
6919 && (input_rel_hdr
->sh_entsize
6920 == sizeof (Elf_External_Rela
)));
6922 /* Adjust the reloc addresses and symbol indices. */
6924 irela
= internal_relocs
;
6925 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6926 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6927 + elf_section_data (o
->output_section
)->rel_count
6928 + elf_section_data (o
->output_section
)->rel_count2
);
6929 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6931 unsigned long r_symndx
;
6934 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6940 irela
->r_offset
+= o
->output_offset
;
6942 /* Relocs in an executable have to be virtual addresses. */
6943 if (!finfo
->info
->relocateable
)
6944 irela
->r_offset
+= o
->output_section
->vma
;
6946 r_symndx
= ELF_R_SYM (irela
->r_info
);
6951 if (r_symndx
>= locsymcount
6952 || (elf_bad_symtab (input_bfd
)
6953 && finfo
->sections
[r_symndx
] == NULL
))
6955 struct elf_link_hash_entry
*rh
;
6958 /* This is a reloc against a global symbol. We
6959 have not yet output all the local symbols, so
6960 we do not know the symbol index of any global
6961 symbol. We set the rel_hash entry for this
6962 reloc to point to the global hash table entry
6963 for this symbol. The symbol index is then
6964 set at the end of elf_bfd_final_link. */
6965 indx
= r_symndx
- extsymoff
;
6966 rh
= elf_sym_hashes (input_bfd
)[indx
];
6967 while (rh
->root
.type
== bfd_link_hash_indirect
6968 || rh
->root
.type
== bfd_link_hash_warning
)
6969 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
6971 /* Setting the index to -2 tells
6972 elf_link_output_extsym that this symbol is
6974 BFD_ASSERT (rh
->indx
< 0);
6982 /* This is a reloc against a local symbol. */
6985 isym
= isymbuf
+ r_symndx
;
6986 sec
= finfo
->sections
[r_symndx
];
6987 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6989 /* I suppose the backend ought to fill in the
6990 section of any STT_SECTION symbol against a
6991 processor specific section. If we have
6992 discarded a section, the output_section will
6993 be the absolute section. */
6994 if (bfd_is_abs_section (sec
)
6996 && bfd_is_abs_section (sec
->output_section
)))
6998 else if (sec
== NULL
|| sec
->owner
== NULL
)
7000 bfd_set_error (bfd_error_bad_value
);
7005 r_symndx
= sec
->output_section
->target_index
;
7006 BFD_ASSERT (r_symndx
!= 0);
7009 /* Adjust the addend according to where the
7010 section winds up in the output section. */
7012 irela
->r_addend
+= sec
->output_offset
;
7016 if (finfo
->indices
[r_symndx
] == -1)
7018 unsigned long shlink
;
7022 if (finfo
->info
->strip
== strip_all
)
7024 /* You can't do ld -r -s. */
7025 bfd_set_error (bfd_error_invalid_operation
);
7029 /* This symbol was skipped earlier, but
7030 since it is needed by a reloc, we
7031 must output it now. */
7032 shlink
= symtab_hdr
->sh_link
;
7033 name
= (bfd_elf_string_from_elf_section
7034 (input_bfd
, shlink
, isym
->st_name
));
7038 osec
= sec
->output_section
;
7040 _bfd_elf_section_from_bfd_section (output_bfd
,
7042 if (isym
->st_shndx
== SHN_BAD
)
7045 isym
->st_value
+= sec
->output_offset
;
7046 if (! finfo
->info
->relocateable
)
7048 isym
->st_value
+= osec
->vma
;
7049 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
)
7051 /* STT_TLS symbols are relative to PT_TLS
7053 BFD_ASSERT (finfo
->first_tls_sec
!= NULL
);
7054 isym
->st_value
-= finfo
->first_tls_sec
->vma
;
7058 finfo
->indices
[r_symndx
]
7059 = bfd_get_symcount (output_bfd
);
7061 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
7065 r_symndx
= finfo
->indices
[r_symndx
];
7068 irela
->r_info
= ELF_R_INFO (r_symndx
,
7069 ELF_R_TYPE (irela
->r_info
));
7072 /* Swap out the relocs. */
7073 if (bed
->elf_backend_emit_relocs
7074 && !(finfo
->info
->relocateable
7075 || finfo
->info
->emitrelocations
))
7076 reloc_emitter
= bed
->elf_backend_emit_relocs
;
7078 reloc_emitter
= elf_link_output_relocs
;
7080 if (! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
,
7084 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
7087 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
7088 * bed
->s
->int_rels_per_ext_rel
);
7089 if (! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
,
7097 /* Write out the modified section contents. */
7098 if (bed
->elf_backend_write_section
7099 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
7101 /* Section written out. */
7103 else switch (elf_section_data (o
)->sec_info_type
)
7105 case ELF_INFO_TYPE_STABS
:
7106 if (! (_bfd_write_section_stabs
7108 &elf_hash_table (finfo
->info
)->stab_info
,
7109 o
, &elf_section_data (o
)->sec_info
, contents
)))
7112 case ELF_INFO_TYPE_MERGE
:
7113 if (! (_bfd_write_merged_section
7114 (output_bfd
, o
, elf_section_data (o
)->sec_info
)))
7117 case ELF_INFO_TYPE_EH_FRAME
:
7122 = bfd_get_section_by_name (elf_hash_table (finfo
->info
)->dynobj
,
7124 if (! (_bfd_elf_write_section_eh_frame (output_bfd
, o
, ehdrsec
,
7131 bfd_size_type sec_size
;
7133 sec_size
= (o
->_cooked_size
!= 0 ? o
->_cooked_size
: o
->_raw_size
);
7134 if (! (o
->flags
& SEC_EXCLUDE
)
7135 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
7137 (file_ptr
) o
->output_offset
,
7148 /* Generate a reloc when linking an ELF file. This is a reloc
7149 requested by the linker, and does come from any input file. This
7150 is used to build constructor and destructor tables when linking
7154 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
7156 struct bfd_link_info
*info
;
7157 asection
*output_section
;
7158 struct bfd_link_order
*link_order
;
7160 reloc_howto_type
*howto
;
7164 struct elf_link_hash_entry
**rel_hash_ptr
;
7165 Elf_Internal_Shdr
*rel_hdr
;
7166 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7168 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
7171 bfd_set_error (bfd_error_bad_value
);
7175 addend
= link_order
->u
.reloc
.p
->addend
;
7177 /* Figure out the symbol index. */
7178 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
7179 + elf_section_data (output_section
)->rel_count
7180 + elf_section_data (output_section
)->rel_count2
);
7181 if (link_order
->type
== bfd_section_reloc_link_order
)
7183 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
7184 BFD_ASSERT (indx
!= 0);
7185 *rel_hash_ptr
= NULL
;
7189 struct elf_link_hash_entry
*h
;
7191 /* Treat a reloc against a defined symbol as though it were
7192 actually against the section. */
7193 h
= ((struct elf_link_hash_entry
*)
7194 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
7195 link_order
->u
.reloc
.p
->u
.name
,
7196 false, false, true));
7198 && (h
->root
.type
== bfd_link_hash_defined
7199 || h
->root
.type
== bfd_link_hash_defweak
))
7203 section
= h
->root
.u
.def
.section
;
7204 indx
= section
->output_section
->target_index
;
7205 *rel_hash_ptr
= NULL
;
7206 /* It seems that we ought to add the symbol value to the
7207 addend here, but in practice it has already been added
7208 because it was passed to constructor_callback. */
7209 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7213 /* Setting the index to -2 tells elf_link_output_extsym that
7214 this symbol is used by a reloc. */
7221 if (! ((*info
->callbacks
->unattached_reloc
)
7222 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
7223 (asection
*) NULL
, (bfd_vma
) 0)))
7229 /* If this is an inplace reloc, we must write the addend into the
7231 if (howto
->partial_inplace
&& addend
!= 0)
7234 bfd_reloc_status_type rstat
;
7237 const char *sym_name
;
7239 size
= bfd_get_reloc_size (howto
);
7240 buf
= (bfd_byte
*) bfd_zmalloc (size
);
7241 if (buf
== (bfd_byte
*) NULL
)
7243 rstat
= _bfd_relocate_contents (howto
, output_bfd
, (bfd_vma
) addend
, buf
);
7250 case bfd_reloc_outofrange
:
7253 case bfd_reloc_overflow
:
7254 if (link_order
->type
== bfd_section_reloc_link_order
)
7255 sym_name
= bfd_section_name (output_bfd
,
7256 link_order
->u
.reloc
.p
->u
.section
);
7258 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7259 if (! ((*info
->callbacks
->reloc_overflow
)
7260 (info
, sym_name
, howto
->name
, addend
,
7261 (bfd
*) NULL
, (asection
*) NULL
, (bfd_vma
) 0)))
7268 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
7269 (file_ptr
) link_order
->offset
, size
);
7275 /* The address of a reloc is relative to the section in a
7276 relocateable file, and is a virtual address in an executable
7278 offset
= link_order
->offset
;
7279 if (! info
->relocateable
)
7280 offset
+= output_section
->vma
;
7282 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7284 if (rel_hdr
->sh_type
== SHT_REL
)
7287 Elf_Internal_Rel
*irel
;
7288 Elf_External_Rel
*erel
;
7291 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
7292 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (size
);
7296 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7297 irel
[i
].r_offset
= offset
;
7298 irel
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7300 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
7301 + elf_section_data (output_section
)->rel_count
);
7303 if (bed
->s
->swap_reloc_out
)
7304 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (bfd_byte
*) erel
);
7306 elf_swap_reloc_out (output_bfd
, irel
, erel
);
7313 Elf_Internal_Rela
*irela
;
7314 Elf_External_Rela
*erela
;
7317 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
7318 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (size
);
7322 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7323 irela
[i
].r_offset
= offset
;
7324 irela
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7325 irela
[0].r_addend
= addend
;
7327 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
7328 + elf_section_data (output_section
)->rel_count
);
7330 if (bed
->s
->swap_reloca_out
)
7331 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (bfd_byte
*) erela
);
7333 elf_swap_reloca_out (output_bfd
, irela
, erela
);
7336 ++elf_section_data (output_section
)->rel_count
;
7341 /* Allocate a pointer to live in a linker created section. */
7344 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
7346 struct bfd_link_info
*info
;
7347 elf_linker_section_t
*lsect
;
7348 struct elf_link_hash_entry
*h
;
7349 const Elf_Internal_Rela
*rel
;
7351 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
7352 elf_linker_section_pointers_t
*linker_section_ptr
;
7353 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7356 BFD_ASSERT (lsect
!= NULL
);
7358 /* Is this a global symbol? */
7361 /* Has this symbol already been allocated? If so, our work is done. */
7362 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
7367 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
7368 /* Make sure this symbol is output as a dynamic symbol. */
7369 if (h
->dynindx
== -1)
7371 if (! elf_link_record_dynamic_symbol (info
, h
))
7375 if (lsect
->rel_section
)
7376 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7380 /* Allocation of a pointer to a local symbol. */
7381 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
7383 /* Allocate a table to hold the local symbols if first time. */
7386 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
7387 register unsigned int i
;
7390 amt
*= sizeof (elf_linker_section_pointers_t
*);
7391 ptr
= (elf_linker_section_pointers_t
**) bfd_alloc (abfd
, amt
);
7396 elf_local_ptr_offsets (abfd
) = ptr
;
7397 for (i
= 0; i
< num_symbols
; i
++)
7398 ptr
[i
] = (elf_linker_section_pointers_t
*) 0;
7401 /* Has this symbol already been allocated? If so, our work is done. */
7402 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
7407 ptr_linker_section_ptr
= &ptr
[r_symndx
];
7411 /* If we are generating a shared object, we need to
7412 output a R_<xxx>_RELATIVE reloc so that the
7413 dynamic linker can adjust this GOT entry. */
7414 BFD_ASSERT (lsect
->rel_section
!= NULL
);
7415 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7419 /* Allocate space for a pointer in the linker section, and allocate
7420 a new pointer record from internal memory. */
7421 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
7422 amt
= sizeof (elf_linker_section_pointers_t
);
7423 linker_section_ptr
= (elf_linker_section_pointers_t
*) bfd_alloc (abfd
, amt
);
7425 if (!linker_section_ptr
)
7428 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
7429 linker_section_ptr
->addend
= rel
->r_addend
;
7430 linker_section_ptr
->which
= lsect
->which
;
7431 linker_section_ptr
->written_address_p
= false;
7432 *ptr_linker_section_ptr
= linker_section_ptr
;
7435 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
7437 linker_section_ptr
->offset
= (lsect
->section
->_raw_size
7438 - lsect
->hole_size
+ (ARCH_SIZE
/ 8));
7439 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
7440 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
7441 if (lsect
->sym_hash
)
7443 /* Bump up symbol value if needed. */
7444 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
7446 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
7447 lsect
->sym_hash
->root
.root
.string
,
7448 (long) ARCH_SIZE
/ 8,
7449 (long) lsect
->sym_hash
->root
.u
.def
.value
);
7455 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
7457 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
7461 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7462 lsect
->name
, (long) linker_section_ptr
->offset
,
7463 (long) lsect
->section
->_raw_size
);
7470 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7473 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7476 /* Fill in the address for a pointer generated in a linker section. */
7479 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
,
7480 relocation
, rel
, relative_reloc
)
7483 struct bfd_link_info
*info
;
7484 elf_linker_section_t
*lsect
;
7485 struct elf_link_hash_entry
*h
;
7487 const Elf_Internal_Rela
*rel
;
7490 elf_linker_section_pointers_t
*linker_section_ptr
;
7492 BFD_ASSERT (lsect
!= NULL
);
7496 /* Handle global symbol. */
7497 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7498 (h
->linker_section_pointer
,
7502 BFD_ASSERT (linker_section_ptr
!= NULL
);
7504 if (! elf_hash_table (info
)->dynamic_sections_created
7507 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
7509 /* This is actually a static link, or it is a
7510 -Bsymbolic link and the symbol is defined
7511 locally. We must initialize this entry in the
7514 When doing a dynamic link, we create a .rela.<xxx>
7515 relocation entry to initialize the value. This
7516 is done in the finish_dynamic_symbol routine. */
7517 if (!linker_section_ptr
->written_address_p
)
7519 linker_section_ptr
->written_address_p
= true;
7520 bfd_put_ptr (output_bfd
,
7521 relocation
+ linker_section_ptr
->addend
,
7522 (lsect
->section
->contents
7523 + linker_section_ptr
->offset
));
7529 /* Handle local symbol. */
7530 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7531 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
7532 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
7533 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7534 (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
7538 BFD_ASSERT (linker_section_ptr
!= NULL
);
7540 /* Write out pointer if it hasn't been rewritten out before. */
7541 if (!linker_section_ptr
->written_address_p
)
7543 linker_section_ptr
->written_address_p
= true;
7544 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
7545 lsect
->section
->contents
+ linker_section_ptr
->offset
);
7549 asection
*srel
= lsect
->rel_section
;
7550 Elf_Internal_Rela
*outrel
;
7551 Elf_External_Rela
*erel
;
7552 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7556 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
7557 outrel
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
7560 (*_bfd_error_handler
) (_("Error: out of memory"));
7564 /* We need to generate a relative reloc for the dynamic
7568 srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
7570 lsect
->rel_section
= srel
;
7573 BFD_ASSERT (srel
!= NULL
);
7575 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7576 outrel
[i
].r_offset
= (lsect
->section
->output_section
->vma
7577 + lsect
->section
->output_offset
7578 + linker_section_ptr
->offset
);
7579 outrel
[0].r_info
= ELF_R_INFO (0, relative_reloc
);
7580 outrel
[0].r_addend
= 0;
7581 erel
= (Elf_External_Rela
*) lsect
->section
->contents
;
7582 erel
+= elf_section_data (lsect
->section
)->rel_count
;
7583 elf_swap_reloca_out (output_bfd
, outrel
, erel
);
7584 ++elf_section_data (lsect
->section
)->rel_count
;
7591 relocation
= (lsect
->section
->output_offset
7592 + linker_section_ptr
->offset
7593 - lsect
->hole_offset
7594 - lsect
->sym_offset
);
7598 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7599 lsect
->name
, (long) relocation
, (long) relocation
);
7602 /* Subtract out the addend, because it will get added back in by the normal
7604 return relocation
- linker_section_ptr
->addend
;
7607 /* Garbage collect unused sections. */
7609 static boolean elf_gc_mark
7610 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
7611 asection
* (*gc_mark_hook
)
7612 PARAMS ((asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7613 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
7615 static boolean elf_gc_sweep
7616 PARAMS ((struct bfd_link_info
*info
,
7617 boolean (*gc_sweep_hook
)
7618 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
7619 const Elf_Internal_Rela
*relocs
))));
7621 static boolean elf_gc_sweep_symbol
7622 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
7624 static boolean elf_gc_allocate_got_offsets
7625 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
7627 static boolean elf_gc_propagate_vtable_entries_used
7628 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
7630 static boolean elf_gc_smash_unused_vtentry_relocs
7631 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
7633 /* The mark phase of garbage collection. For a given section, mark
7634 it and any sections in this section's group, and all the sections
7635 which define symbols to which it refers. */
7638 elf_gc_mark (info
, sec
, gc_mark_hook
)
7639 struct bfd_link_info
*info
;
7641 asection
* (*gc_mark_hook
)
7642 PARAMS ((asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7643 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
7646 asection
*group_sec
;
7650 /* Mark all the sections in the group. */
7651 group_sec
= elf_section_data (sec
)->next_in_group
;
7652 if (group_sec
&& !group_sec
->gc_mark
)
7653 if (!elf_gc_mark (info
, group_sec
, gc_mark_hook
))
7656 /* Look through the section relocs. */
7658 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
7660 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
7661 Elf_Internal_Shdr
*symtab_hdr
;
7662 struct elf_link_hash_entry
**sym_hashes
;
7665 bfd
*input_bfd
= sec
->owner
;
7666 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
7667 Elf_Internal_Sym
*isym
= NULL
;
7669 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
7670 sym_hashes
= elf_sym_hashes (input_bfd
);
7672 /* Read the local symbols. */
7673 if (elf_bad_symtab (input_bfd
))
7675 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
7679 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
7681 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
7682 if (isym
== NULL
&& nlocsyms
!= 0)
7684 isym
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, nlocsyms
, 0,
7690 /* Read the relocations. */
7691 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7692 (input_bfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
7693 info
->keep_memory
));
7694 if (relstart
== NULL
)
7699 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7701 for (rel
= relstart
; rel
< relend
; rel
++)
7703 unsigned long r_symndx
;
7705 struct elf_link_hash_entry
*h
;
7707 r_symndx
= ELF_R_SYM (rel
->r_info
);
7711 if (r_symndx
>= nlocsyms
7712 || ELF_ST_BIND (isym
[r_symndx
].st_info
) != STB_LOCAL
)
7714 h
= sym_hashes
[r_symndx
- extsymoff
];
7715 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, h
, NULL
);
7719 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, NULL
, &isym
[r_symndx
]);
7722 if (rsec
&& !rsec
->gc_mark
)
7724 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
7726 else if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
7735 if (elf_section_data (sec
)->relocs
!= relstart
)
7738 if (isym
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isym
)
7740 if (! info
->keep_memory
)
7743 symtab_hdr
->contents
= (unsigned char *) isym
;
7750 /* The sweep phase of garbage collection. Remove all garbage sections. */
7753 elf_gc_sweep (info
, gc_sweep_hook
)
7754 struct bfd_link_info
*info
;
7755 boolean (*gc_sweep_hook
)
7756 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
7757 const Elf_Internal_Rela
*relocs
));
7761 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7765 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
7768 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7770 /* Keep special sections. Keep .debug sections. */
7771 if ((o
->flags
& SEC_LINKER_CREATED
)
7772 || (o
->flags
& SEC_DEBUGGING
))
7778 /* Skip sweeping sections already excluded. */
7779 if (o
->flags
& SEC_EXCLUDE
)
7782 /* Since this is early in the link process, it is simple
7783 to remove a section from the output. */
7784 o
->flags
|= SEC_EXCLUDE
;
7786 /* But we also have to update some of the relocation
7787 info we collected before. */
7789 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
7791 Elf_Internal_Rela
*internal_relocs
;
7794 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
7795 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
7796 if (internal_relocs
== NULL
)
7799 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
7801 if (elf_section_data (o
)->relocs
!= internal_relocs
)
7802 free (internal_relocs
);
7810 /* Remove the symbols that were in the swept sections from the dynamic
7811 symbol table. GCFIXME: Anyone know how to get them out of the
7812 static symbol table as well? */
7816 elf_link_hash_traverse (elf_hash_table (info
),
7817 elf_gc_sweep_symbol
,
7820 elf_hash_table (info
)->dynsymcount
= i
;
7826 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7829 elf_gc_sweep_symbol (h
, idxptr
)
7830 struct elf_link_hash_entry
*h
;
7833 int *idx
= (int *) idxptr
;
7835 if (h
->root
.type
== bfd_link_hash_warning
)
7836 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7838 if (h
->dynindx
!= -1
7839 && ((h
->root
.type
!= bfd_link_hash_defined
7840 && h
->root
.type
!= bfd_link_hash_defweak
)
7841 || h
->root
.u
.def
.section
->gc_mark
))
7842 h
->dynindx
= (*idx
)++;
7847 /* Propogate collected vtable information. This is called through
7848 elf_link_hash_traverse. */
7851 elf_gc_propagate_vtable_entries_used (h
, okp
)
7852 struct elf_link_hash_entry
*h
;
7855 if (h
->root
.type
== bfd_link_hash_warning
)
7856 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7858 /* Those that are not vtables. */
7859 if (h
->vtable_parent
== NULL
)
7862 /* Those vtables that do not have parents, we cannot merge. */
7863 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
7866 /* If we've already been done, exit. */
7867 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
7870 /* Make sure the parent's table is up to date. */
7871 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
7873 if (h
->vtable_entries_used
== NULL
)
7875 /* None of this table's entries were referenced. Re-use the
7877 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
7878 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
7885 /* Or the parent's entries into ours. */
7886 cu
= h
->vtable_entries_used
;
7888 pu
= h
->vtable_parent
->vtable_entries_used
;
7891 asection
*sec
= h
->root
.u
.def
.section
;
7892 struct elf_backend_data
*bed
= get_elf_backend_data (sec
->owner
);
7893 int file_align
= bed
->s
->file_align
;
7895 n
= h
->vtable_parent
->vtable_entries_size
/ file_align
;
7910 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
7911 struct elf_link_hash_entry
*h
;
7915 bfd_vma hstart
, hend
;
7916 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
7917 struct elf_backend_data
*bed
;
7920 if (h
->root
.type
== bfd_link_hash_warning
)
7921 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7923 /* Take care of both those symbols that do not describe vtables as
7924 well as those that are not loaded. */
7925 if (h
->vtable_parent
== NULL
)
7928 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
7929 || h
->root
.type
== bfd_link_hash_defweak
);
7931 sec
= h
->root
.u
.def
.section
;
7932 hstart
= h
->root
.u
.def
.value
;
7933 hend
= hstart
+ h
->size
;
7935 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7936 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
7938 return *(boolean
*) okp
= false;
7939 bed
= get_elf_backend_data (sec
->owner
);
7940 file_align
= bed
->s
->file_align
;
7942 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7944 for (rel
= relstart
; rel
< relend
; ++rel
)
7945 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
7947 /* If the entry is in use, do nothing. */
7948 if (h
->vtable_entries_used
7949 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
7951 bfd_vma entry
= (rel
->r_offset
- hstart
) / file_align
;
7952 if (h
->vtable_entries_used
[entry
])
7955 /* Otherwise, kill it. */
7956 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
7962 /* Do mark and sweep of unused sections. */
7965 elf_gc_sections (abfd
, info
)
7967 struct bfd_link_info
*info
;
7971 asection
* (*gc_mark_hook
)
7972 PARAMS ((asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7973 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
7975 if (!get_elf_backend_data (abfd
)->can_gc_sections
7976 || info
->relocateable
|| info
->emitrelocations
7977 || elf_hash_table (info
)->dynamic_sections_created
)
7980 /* Apply transitive closure to the vtable entry usage info. */
7981 elf_link_hash_traverse (elf_hash_table (info
),
7982 elf_gc_propagate_vtable_entries_used
,
7987 /* Kill the vtable relocations that were not used. */
7988 elf_link_hash_traverse (elf_hash_table (info
),
7989 elf_gc_smash_unused_vtentry_relocs
,
7994 /* Grovel through relocs to find out who stays ... */
7996 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
7997 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8001 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8004 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8006 if (o
->flags
& SEC_KEEP
)
8007 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
8012 /* ... and mark SEC_EXCLUDE for those that go. */
8013 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
8019 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
8022 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
8025 struct elf_link_hash_entry
*h
;
8028 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
8029 struct elf_link_hash_entry
**search
, *child
;
8030 bfd_size_type extsymcount
;
8032 /* The sh_info field of the symtab header tells us where the
8033 external symbols start. We don't care about the local symbols at
8035 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
8036 if (!elf_bad_symtab (abfd
))
8037 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
8039 sym_hashes
= elf_sym_hashes (abfd
);
8040 sym_hashes_end
= sym_hashes
+ extsymcount
;
8042 /* Hunt down the child symbol, which is in this section at the same
8043 offset as the relocation. */
8044 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
8046 if ((child
= *search
) != NULL
8047 && (child
->root
.type
== bfd_link_hash_defined
8048 || child
->root
.type
== bfd_link_hash_defweak
)
8049 && child
->root
.u
.def
.section
== sec
8050 && child
->root
.u
.def
.value
== offset
)
8054 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
8055 bfd_archive_filename (abfd
), sec
->name
,
8056 (unsigned long) offset
);
8057 bfd_set_error (bfd_error_invalid_operation
);
8063 /* This *should* only be the absolute section. It could potentially
8064 be that someone has defined a non-global vtable though, which
8065 would be bad. It isn't worth paging in the local symbols to be
8066 sure though; that case should simply be handled by the assembler. */
8068 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
8071 child
->vtable_parent
= h
;
8076 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
8079 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
8080 bfd
*abfd ATTRIBUTE_UNUSED
;
8081 asection
*sec ATTRIBUTE_UNUSED
;
8082 struct elf_link_hash_entry
*h
;
8085 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8086 int file_align
= bed
->s
->file_align
;
8088 if (addend
>= h
->vtable_entries_size
)
8091 boolean
*ptr
= h
->vtable_entries_used
;
8093 /* While the symbol is undefined, we have to be prepared to handle
8095 if (h
->root
.type
== bfd_link_hash_undefined
)
8102 /* Oops! We've got a reference past the defined end of
8103 the table. This is probably a bug -- shall we warn? */
8108 /* Allocate one extra entry for use as a "done" flag for the
8109 consolidation pass. */
8110 bytes
= (size
/ file_align
+ 1) * sizeof (boolean
);
8114 ptr
= bfd_realloc (ptr
- 1, (bfd_size_type
) bytes
);
8120 oldbytes
= ((h
->vtable_entries_size
/ file_align
+ 1)
8121 * sizeof (boolean
));
8122 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
8126 ptr
= bfd_zmalloc ((bfd_size_type
) bytes
);
8131 /* And arrange for that done flag to be at index -1. */
8132 h
->vtable_entries_used
= ptr
+ 1;
8133 h
->vtable_entries_size
= size
;
8136 h
->vtable_entries_used
[addend
/ file_align
] = true;
8141 /* And an accompanying bit to work out final got entry offsets once
8142 we're done. Should be called from final_link. */
8145 elf_gc_common_finalize_got_offsets (abfd
, info
)
8147 struct bfd_link_info
*info
;
8150 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8153 /* The GOT offset is relative to the .got section, but the GOT header is
8154 put into the .got.plt section, if the backend uses it. */
8155 if (bed
->want_got_plt
)
8158 gotoff
= bed
->got_header_size
;
8160 /* Do the local .got entries first. */
8161 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
8163 bfd_signed_vma
*local_got
;
8164 bfd_size_type j
, locsymcount
;
8165 Elf_Internal_Shdr
*symtab_hdr
;
8167 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
8170 local_got
= elf_local_got_refcounts (i
);
8174 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
8175 if (elf_bad_symtab (i
))
8176 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8178 locsymcount
= symtab_hdr
->sh_info
;
8180 for (j
= 0; j
< locsymcount
; ++j
)
8182 if (local_got
[j
] > 0)
8184 local_got
[j
] = gotoff
;
8185 gotoff
+= ARCH_SIZE
/ 8;
8188 local_got
[j
] = (bfd_vma
) -1;
8192 /* Then the global .got entries. .plt refcounts are handled by
8193 adjust_dynamic_symbol */
8194 elf_link_hash_traverse (elf_hash_table (info
),
8195 elf_gc_allocate_got_offsets
,
8200 /* We need a special top-level link routine to convert got reference counts
8201 to real got offsets. */
8204 elf_gc_allocate_got_offsets (h
, offarg
)
8205 struct elf_link_hash_entry
*h
;
8208 bfd_vma
*off
= (bfd_vma
*) offarg
;
8210 if (h
->root
.type
== bfd_link_hash_warning
)
8211 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8213 if (h
->got
.refcount
> 0)
8215 h
->got
.offset
= off
[0];
8216 off
[0] += ARCH_SIZE
/ 8;
8219 h
->got
.offset
= (bfd_vma
) -1;
8224 /* Many folk need no more in the way of final link than this, once
8225 got entry reference counting is enabled. */
8228 elf_gc_common_final_link (abfd
, info
)
8230 struct bfd_link_info
*info
;
8232 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
8235 /* Invoke the regular ELF backend linker to do all the work. */
8236 return elf_bfd_final_link (abfd
, info
);
8239 /* This function will be called though elf_link_hash_traverse to store
8240 all hash value of the exported symbols in an array. */
8243 elf_collect_hash_codes (h
, data
)
8244 struct elf_link_hash_entry
*h
;
8247 unsigned long **valuep
= (unsigned long **) data
;
8253 if (h
->root
.type
== bfd_link_hash_warning
)
8254 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8256 /* Ignore indirect symbols. These are added by the versioning code. */
8257 if (h
->dynindx
== -1)
8260 name
= h
->root
.root
.string
;
8261 p
= strchr (name
, ELF_VER_CHR
);
8264 alc
= bfd_malloc ((bfd_size_type
) (p
- name
+ 1));
8265 memcpy (alc
, name
, (size_t) (p
- name
));
8266 alc
[p
- name
] = '\0';
8270 /* Compute the hash value. */
8271 ha
= bfd_elf_hash (name
);
8273 /* Store the found hash value in the array given as the argument. */
8276 /* And store it in the struct so that we can put it in the hash table
8278 h
->elf_hash_value
= ha
;
8287 elf_reloc_symbol_deleted_p (offset
, cookie
)
8291 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
8293 if (rcookie
->bad_symtab
)
8294 rcookie
->rel
= rcookie
->rels
;
8296 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
8298 unsigned long r_symndx
= ELF_R_SYM (rcookie
->rel
->r_info
);
8300 if (! rcookie
->bad_symtab
)
8301 if (rcookie
->rel
->r_offset
> offset
)
8303 if (rcookie
->rel
->r_offset
!= offset
)
8306 if (r_symndx
>= rcookie
->locsymcount
8307 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
8309 struct elf_link_hash_entry
*h
;
8311 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
8313 while (h
->root
.type
== bfd_link_hash_indirect
8314 || h
->root
.type
== bfd_link_hash_warning
)
8315 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8317 if ((h
->root
.type
== bfd_link_hash_defined
8318 || h
->root
.type
== bfd_link_hash_defweak
)
8319 && elf_discarded_section (h
->root
.u
.def
.section
))
8326 /* It's not a relocation against a global symbol,
8327 but it could be a relocation against a local
8328 symbol for a discarded section. */
8330 Elf_Internal_Sym
*isym
;
8332 /* Need to: get the symbol; get the section. */
8333 isym
= &rcookie
->locsyms
[r_symndx
];
8334 if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
8336 isec
= section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
8337 if (isec
!= NULL
&& elf_discarded_section (isec
))
8346 /* Discard unneeded references to discarded sections.
8347 Returns true if any section's size was changed. */
8348 /* This function assumes that the relocations are in sorted order,
8349 which is true for all known assemblers. */
8352 elf_bfd_discard_info (output_bfd
, info
)
8354 struct bfd_link_info
*info
;
8356 struct elf_reloc_cookie cookie
;
8357 asection
*stab
, *eh
, *ehdr
;
8358 Elf_Internal_Shdr
*symtab_hdr
;
8359 struct elf_backend_data
*bed
;
8361 boolean ret
= false;
8362 boolean strip
= info
->strip
== strip_all
|| info
->strip
== strip_debugger
;
8364 if (info
->relocateable
8365 || info
->traditional_format
8366 || info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
8367 || ! is_elf_hash_table (info
))
8371 if (elf_hash_table (info
)->dynobj
!= NULL
)
8372 ehdr
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
8375 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
8377 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
8380 bed
= get_elf_backend_data (abfd
);
8382 if ((abfd
->flags
& DYNAMIC
) != 0)
8388 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
8389 if (eh
&& (eh
->_raw_size
== 0
8390 || bfd_is_abs_section (eh
->output_section
)))
8397 stab
= bfd_get_section_by_name (abfd
, ".stab");
8398 if (stab
&& (stab
->_raw_size
== 0
8399 || bfd_is_abs_section (stab
->output_section
)))
8403 || elf_section_data(stab
)->sec_info_type
!= ELF_INFO_TYPE_STABS
)
8405 && (strip
|| ! bed
->elf_backend_discard_info
))
8408 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8410 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
8411 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
8412 if (cookie
.bad_symtab
)
8414 cookie
.locsymcount
=
8415 symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8416 cookie
.extsymoff
= 0;
8420 cookie
.locsymcount
= symtab_hdr
->sh_info
;
8421 cookie
.extsymoff
= symtab_hdr
->sh_info
;
8424 cookie
.locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8425 if (cookie
.locsyms
== NULL
&& cookie
.locsymcount
!= 0)
8427 cookie
.locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
8428 cookie
.locsymcount
, 0,
8430 if (cookie
.locsyms
== NULL
)
8436 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8437 (abfd
, stab
, (PTR
) NULL
, (Elf_Internal_Rela
*) NULL
,
8438 info
->keep_memory
));
8441 cookie
.rel
= cookie
.rels
;
8443 cookie
.rels
+ stab
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8444 if (_bfd_discard_section_stabs (abfd
, stab
,
8445 elf_section_data (stab
)->sec_info
,
8446 elf_reloc_symbol_deleted_p
,
8449 if (elf_section_data (stab
)->relocs
!= cookie
.rels
)
8458 cookie
.relend
= NULL
;
8459 if (eh
->reloc_count
)
8460 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8461 (abfd
, eh
, (PTR
) NULL
, (Elf_Internal_Rela
*) NULL
,
8462 info
->keep_memory
));
8465 cookie
.rel
= cookie
.rels
;
8467 cookie
.rels
+ eh
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8469 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
, ehdr
,
8470 elf_reloc_symbol_deleted_p
,
8473 if (cookie
.rels
&& elf_section_data (eh
)->relocs
!= cookie
.rels
)
8477 if (bed
->elf_backend_discard_info
)
8479 if (bed
->elf_backend_discard_info (abfd
, &cookie
, info
))
8483 if (cookie
.locsyms
!= NULL
8484 && symtab_hdr
->contents
!= (unsigned char *) cookie
.locsyms
)
8486 if (! info
->keep_memory
)
8487 free (cookie
.locsyms
);
8489 symtab_hdr
->contents
= (unsigned char *) cookie
.locsyms
;
8493 if (ehdr
&& _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
, ehdr
))
8499 elf_section_ignore_discarded_relocs (sec
)
8502 struct elf_backend_data
*bed
;
8504 switch (elf_section_data (sec
)->sec_info_type
)
8506 case ELF_INFO_TYPE_STABS
:
8507 case ELF_INFO_TYPE_EH_FRAME
:
8513 bed
= get_elf_backend_data (sec
->owner
);
8514 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
8515 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))