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_find_version_dependencies
61 PARAMS ((struct elf_link_hash_entry
*, PTR
));
62 static boolean elf_link_assign_sym_version
63 PARAMS ((struct elf_link_hash_entry
*, PTR
));
64 static boolean elf_collect_hash_codes
65 PARAMS ((struct elf_link_hash_entry
*, PTR
));
66 static boolean elf_link_read_relocs_from_section
67 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
68 static size_t compute_bucket_count
69 PARAMS ((struct bfd_link_info
*));
70 static void elf_link_output_relocs
71 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
72 static boolean elf_link_size_reloc_section
73 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
74 static void elf_link_adjust_relocs
75 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
76 struct elf_link_hash_entry
**));
77 static int elf_link_sort_cmp1
78 PARAMS ((const void *, const void *));
79 static int elf_link_sort_cmp2
80 PARAMS ((const void *, const void *));
81 static size_t elf_link_sort_relocs
82 PARAMS ((bfd
*, struct bfd_link_info
*, asection
**));
83 static boolean elf_section_ignore_discarded_relocs
84 PARAMS ((asection
*));
86 /* Given an ELF BFD, add symbols to the global hash table as
90 elf_bfd_link_add_symbols (abfd
, info
)
92 struct bfd_link_info
*info
;
94 switch (bfd_get_format (abfd
))
97 return elf_link_add_object_symbols (abfd
, info
);
99 return elf_link_add_archive_symbols (abfd
, info
);
101 bfd_set_error (bfd_error_wrong_format
);
106 /* Return true iff this is a non-common, definition of a non-function symbol. */
108 is_global_data_symbol_definition (abfd
, sym
)
109 bfd
* abfd ATTRIBUTE_UNUSED
;
110 Elf_Internal_Sym
* sym
;
112 /* Local symbols do not count, but target specific ones might. */
113 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
114 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
117 /* Function symbols do not count. */
118 if (ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)
121 /* If the section is undefined, then so is the symbol. */
122 if (sym
->st_shndx
== SHN_UNDEF
)
125 /* If the symbol is defined in the common section, then
126 it is a common definition and so does not count. */
127 if (sym
->st_shndx
== SHN_COMMON
)
130 /* If the symbol is in a target specific section then we
131 must rely upon the backend to tell us what it is. */
132 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
133 /* FIXME - this function is not coded yet:
135 return _bfd_is_global_symbol_definition (abfd, sym);
137 Instead for now assume that the definition is not global,
138 Even if this is wrong, at least the linker will behave
139 in the same way that it used to do. */
145 /* Search the symbol table of the archive element of the archive ABFD
146 whose archive map contains a mention of SYMDEF, and determine if
147 the symbol is defined in this element. */
149 elf_link_is_defined_archive_symbol (abfd
, symdef
)
153 Elf_Internal_Shdr
* hdr
;
154 Elf_Internal_Shdr
* shndx_hdr
;
155 Elf_External_Sym
* esym
;
156 Elf_External_Sym
* esymend
;
157 Elf_External_Sym
* buf
= NULL
;
158 Elf_External_Sym_Shndx
* shndx_buf
= NULL
;
159 Elf_External_Sym_Shndx
* shndx
;
160 bfd_size_type symcount
;
161 bfd_size_type extsymcount
;
162 bfd_size_type extsymoff
;
163 boolean result
= false;
167 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
168 if (abfd
== (bfd
*) NULL
)
171 if (! bfd_check_format (abfd
, bfd_object
))
174 /* If we have already included the element containing this symbol in the
175 link then we do not need to include it again. Just claim that any symbol
176 it contains is not a definition, so that our caller will not decide to
177 (re)include this element. */
178 if (abfd
->archive_pass
)
181 /* Select the appropriate symbol table. */
182 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
184 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
185 shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
189 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
193 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
195 /* The sh_info field of the symtab header tells us where the
196 external symbols start. We don't care about the local symbols. */
197 if (elf_bad_symtab (abfd
))
199 extsymcount
= symcount
;
204 extsymcount
= symcount
- hdr
->sh_info
;
205 extsymoff
= hdr
->sh_info
;
208 amt
= extsymcount
* sizeof (Elf_External_Sym
);
209 buf
= (Elf_External_Sym
*) bfd_malloc (amt
);
210 if (buf
== NULL
&& extsymcount
!= 0)
213 /* Read in the symbol table.
214 FIXME: This ought to be cached somewhere. */
215 pos
= hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
);
216 if (bfd_seek (abfd
, pos
, SEEK_SET
) != 0
217 || bfd_bread ((PTR
) buf
, amt
, abfd
) != amt
)
220 if (shndx_hdr
!= NULL
&& shndx_hdr
->sh_size
!= 0)
222 amt
= extsymcount
* sizeof (Elf_External_Sym_Shndx
);
223 shndx_buf
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
224 if (shndx_buf
== NULL
&& extsymcount
!= 0)
227 pos
= shndx_hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym_Shndx
);
228 if (bfd_seek (abfd
, pos
, SEEK_SET
) != 0
229 || bfd_bread ((PTR
) shndx_buf
, amt
, abfd
) != amt
)
233 /* Scan the symbol table looking for SYMDEF. */
234 esymend
= buf
+ extsymcount
;
235 for (esym
= buf
, shndx
= shndx_buf
;
237 esym
++, shndx
= (shndx
!= NULL
? shndx
+ 1 : NULL
))
239 Elf_Internal_Sym sym
;
242 elf_swap_symbol_in (abfd
, esym
, shndx
, &sym
);
244 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
245 if (name
== (const char *) NULL
)
248 if (strcmp (name
, symdef
->name
) == 0)
250 result
= is_global_data_symbol_definition (abfd
, & sym
);
256 if (shndx_buf
!= NULL
)
264 /* Add symbols from an ELF archive file to the linker hash table. We
265 don't use _bfd_generic_link_add_archive_symbols because of a
266 problem which arises on UnixWare. The UnixWare libc.so is an
267 archive which includes an entry libc.so.1 which defines a bunch of
268 symbols. The libc.so archive also includes a number of other
269 object files, which also define symbols, some of which are the same
270 as those defined in libc.so.1. Correct linking requires that we
271 consider each object file in turn, and include it if it defines any
272 symbols we need. _bfd_generic_link_add_archive_symbols does not do
273 this; it looks through the list of undefined symbols, and includes
274 any object file which defines them. When this algorithm is used on
275 UnixWare, it winds up pulling in libc.so.1 early and defining a
276 bunch of symbols. This means that some of the other objects in the
277 archive are not included in the link, which is incorrect since they
278 precede libc.so.1 in the archive.
280 Fortunately, ELF archive handling is simpler than that done by
281 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
282 oddities. In ELF, if we find a symbol in the archive map, and the
283 symbol is currently undefined, we know that we must pull in that
286 Unfortunately, we do have to make multiple passes over the symbol
287 table until nothing further is resolved. */
290 elf_link_add_archive_symbols (abfd
, info
)
292 struct bfd_link_info
*info
;
295 boolean
*defined
= NULL
;
296 boolean
*included
= NULL
;
301 if (! bfd_has_map (abfd
))
303 /* An empty archive is a special case. */
304 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
306 bfd_set_error (bfd_error_no_armap
);
310 /* Keep track of all symbols we know to be already defined, and all
311 files we know to be already included. This is to speed up the
312 second and subsequent passes. */
313 c
= bfd_ardata (abfd
)->symdef_count
;
317 amt
*= sizeof (boolean
);
318 defined
= (boolean
*) bfd_malloc (amt
);
319 included
= (boolean
*) bfd_malloc (amt
);
320 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
322 memset (defined
, 0, (size_t) amt
);
323 memset (included
, 0, (size_t) amt
);
325 symdefs
= bfd_ardata (abfd
)->symdefs
;
338 symdefend
= symdef
+ c
;
339 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
341 struct elf_link_hash_entry
*h
;
343 struct bfd_link_hash_entry
*undefs_tail
;
346 if (defined
[i
] || included
[i
])
348 if (symdef
->file_offset
== last
)
354 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
355 false, false, false);
361 /* If this is a default version (the name contains @@),
362 look up the symbol again without the version. The
363 effect is that references to the symbol without the
364 version will be matched by the default symbol in the
367 p
= strchr (symdef
->name
, ELF_VER_CHR
);
368 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
371 copy
= bfd_alloc (abfd
, (bfd_size_type
) (p
- symdef
->name
+ 1));
374 memcpy (copy
, symdef
->name
, (size_t) (p
- symdef
->name
));
375 copy
[p
- symdef
->name
] = '\0';
377 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
378 false, false, false);
380 bfd_release (abfd
, copy
);
386 if (h
->root
.type
== bfd_link_hash_common
)
388 /* We currently have a common symbol. The archive map contains
389 a reference to this symbol, so we may want to include it. We
390 only want to include it however, if this archive element
391 contains a definition of the symbol, not just another common
394 Unfortunately some archivers (including GNU ar) will put
395 declarations of common symbols into their archive maps, as
396 well as real definitions, so we cannot just go by the archive
397 map alone. Instead we must read in the element's symbol
398 table and check that to see what kind of symbol definition
400 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
403 else if (h
->root
.type
!= bfd_link_hash_undefined
)
405 if (h
->root
.type
!= bfd_link_hash_undefweak
)
410 /* We need to include this archive member. */
411 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
412 if (element
== (bfd
*) NULL
)
415 if (! bfd_check_format (element
, bfd_object
))
418 /* Doublecheck that we have not included this object
419 already--it should be impossible, but there may be
420 something wrong with the archive. */
421 if (element
->archive_pass
!= 0)
423 bfd_set_error (bfd_error_bad_value
);
426 element
->archive_pass
= 1;
428 undefs_tail
= info
->hash
->undefs_tail
;
430 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
433 if (! elf_link_add_object_symbols (element
, info
))
436 /* If there are any new undefined symbols, we need to make
437 another pass through the archive in order to see whether
438 they can be defined. FIXME: This isn't perfect, because
439 common symbols wind up on undefs_tail and because an
440 undefined symbol which is defined later on in this pass
441 does not require another pass. This isn't a bug, but it
442 does make the code less efficient than it could be. */
443 if (undefs_tail
!= info
->hash
->undefs_tail
)
446 /* Look backward to mark all symbols from this object file
447 which we have already seen in this pass. */
451 included
[mark
] = true;
456 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
458 /* We mark subsequent symbols from this object file as we go
459 on through the loop. */
460 last
= symdef
->file_offset
;
471 if (defined
!= (boolean
*) NULL
)
473 if (included
!= (boolean
*) NULL
)
478 /* This function is called when we want to define a new symbol. It
479 handles the various cases which arise when we find a definition in
480 a dynamic object, or when there is already a definition in a
481 dynamic object. The new symbol is described by NAME, SYM, PSEC,
482 and PVALUE. We set SYM_HASH to the hash table entry. We set
483 OVERRIDE if the old symbol is overriding a new definition. We set
484 TYPE_CHANGE_OK if it is OK for the type to change. We set
485 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
486 change, we mean that we shouldn't warn if the type or size does
487 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
491 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
492 override
, type_change_ok
, size_change_ok
, dt_needed
)
494 struct bfd_link_info
*info
;
496 Elf_Internal_Sym
*sym
;
499 struct elf_link_hash_entry
**sym_hash
;
501 boolean
*type_change_ok
;
502 boolean
*size_change_ok
;
506 struct elf_link_hash_entry
*h
;
509 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
514 bind
= ELF_ST_BIND (sym
->st_info
);
516 if (! bfd_is_und_section (sec
))
517 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
519 h
= ((struct elf_link_hash_entry
*)
520 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
525 /* This code is for coping with dynamic objects, and is only useful
526 if we are doing an ELF link. */
527 if (info
->hash
->creator
!= abfd
->xvec
)
530 /* For merging, we only care about real symbols. */
532 while (h
->root
.type
== bfd_link_hash_indirect
533 || h
->root
.type
== bfd_link_hash_warning
)
534 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
536 /* If we just created the symbol, mark it as being an ELF symbol.
537 Other than that, there is nothing to do--there is no merge issue
538 with a newly defined symbol--so we just return. */
540 if (h
->root
.type
== bfd_link_hash_new
)
542 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
546 /* OLDBFD is a BFD associated with the existing symbol. */
548 switch (h
->root
.type
)
554 case bfd_link_hash_undefined
:
555 case bfd_link_hash_undefweak
:
556 oldbfd
= h
->root
.u
.undef
.abfd
;
559 case bfd_link_hash_defined
:
560 case bfd_link_hash_defweak
:
561 oldbfd
= h
->root
.u
.def
.section
->owner
;
564 case bfd_link_hash_common
:
565 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
569 /* In cases involving weak versioned symbols, we may wind up trying
570 to merge a symbol with itself. Catch that here, to avoid the
571 confusion that results if we try to override a symbol with
572 itself. The additional tests catch cases like
573 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
574 dynamic object, which we do want to handle here. */
576 && ((abfd
->flags
& DYNAMIC
) == 0
577 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
580 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
581 respectively, is from a dynamic object. */
583 if ((abfd
->flags
& DYNAMIC
) != 0)
589 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
594 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
595 indices used by MIPS ELF. */
596 switch (h
->root
.type
)
602 case bfd_link_hash_defined
:
603 case bfd_link_hash_defweak
:
604 hsec
= h
->root
.u
.def
.section
;
607 case bfd_link_hash_common
:
608 hsec
= h
->root
.u
.c
.p
->section
;
615 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
618 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
619 respectively, appear to be a definition rather than reference. */
621 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
626 if (h
->root
.type
== bfd_link_hash_undefined
627 || h
->root
.type
== bfd_link_hash_undefweak
628 || h
->root
.type
== bfd_link_hash_common
)
633 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
634 symbol, respectively, appears to be a common symbol in a dynamic
635 object. If a symbol appears in an uninitialized section, and is
636 not weak, and is not a function, then it may be a common symbol
637 which was resolved when the dynamic object was created. We want
638 to treat such symbols specially, because they raise special
639 considerations when setting the symbol size: if the symbol
640 appears as a common symbol in a regular object, and the size in
641 the regular object is larger, we must make sure that we use the
642 larger size. This problematic case can always be avoided in C,
643 but it must be handled correctly when using Fortran shared
646 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
647 likewise for OLDDYNCOMMON and OLDDEF.
649 Note that this test is just a heuristic, and that it is quite
650 possible to have an uninitialized symbol in a shared object which
651 is really a definition, rather than a common symbol. This could
652 lead to some minor confusion when the symbol really is a common
653 symbol in some regular object. However, I think it will be
658 && (sec
->flags
& SEC_ALLOC
) != 0
659 && (sec
->flags
& SEC_LOAD
) == 0
662 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
665 newdyncommon
= false;
669 && h
->root
.type
== bfd_link_hash_defined
670 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
671 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
672 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
674 && h
->type
!= STT_FUNC
)
677 olddyncommon
= false;
679 /* It's OK to change the type if either the existing symbol or the
680 new symbol is weak unless it comes from a DT_NEEDED entry of
681 a shared object, in which case, the DT_NEEDED entry may not be
682 required at the run time. */
684 if ((! dt_needed
&& h
->root
.type
== bfd_link_hash_defweak
)
685 || h
->root
.type
== bfd_link_hash_undefweak
687 *type_change_ok
= true;
689 /* It's OK to change the size if either the existing symbol or the
690 new symbol is weak, or if the old symbol is undefined. */
693 || h
->root
.type
== bfd_link_hash_undefined
)
694 *size_change_ok
= true;
696 /* If both the old and the new symbols look like common symbols in a
697 dynamic object, set the size of the symbol to the larger of the
702 && sym
->st_size
!= h
->size
)
704 /* Since we think we have two common symbols, issue a multiple
705 common warning if desired. Note that we only warn if the
706 size is different. If the size is the same, we simply let
707 the old symbol override the new one as normally happens with
708 symbols defined in dynamic objects. */
710 if (! ((*info
->callbacks
->multiple_common
)
711 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
712 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
715 if (sym
->st_size
> h
->size
)
716 h
->size
= sym
->st_size
;
718 *size_change_ok
= true;
721 /* If we are looking at a dynamic object, and we have found a
722 definition, we need to see if the symbol was already defined by
723 some other object. If so, we want to use the existing
724 definition, and we do not want to report a multiple symbol
725 definition error; we do this by clobbering *PSEC to be
728 We treat a common symbol as a definition if the symbol in the
729 shared library is a function, since common symbols always
730 represent variables; this can cause confusion in principle, but
731 any such confusion would seem to indicate an erroneous program or
732 shared library. We also permit a common symbol in a regular
733 object to override a weak symbol in a shared object.
735 We prefer a non-weak definition in a shared library to a weak
736 definition in the executable unless it comes from a DT_NEEDED
737 entry of a shared object, in which case, the DT_NEEDED entry
738 may not be required at the run time. */
743 || (h
->root
.type
== bfd_link_hash_common
745 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
746 && (h
->root
.type
!= bfd_link_hash_defweak
748 || bind
== STB_WEAK
))
752 newdyncommon
= false;
754 *psec
= sec
= bfd_und_section_ptr
;
755 *size_change_ok
= true;
757 /* If we get here when the old symbol is a common symbol, then
758 we are explicitly letting it override a weak symbol or
759 function in a dynamic object, and we don't want to warn about
760 a type change. If the old symbol is a defined symbol, a type
761 change warning may still be appropriate. */
763 if (h
->root
.type
== bfd_link_hash_common
)
764 *type_change_ok
= true;
767 /* Handle the special case of an old common symbol merging with a
768 new symbol which looks like a common symbol in a shared object.
769 We change *PSEC and *PVALUE to make the new symbol look like a
770 common symbol, and let _bfd_generic_link_add_one_symbol will do
774 && h
->root
.type
== bfd_link_hash_common
)
778 newdyncommon
= false;
779 *pvalue
= sym
->st_size
;
780 *psec
= sec
= bfd_com_section_ptr
;
781 *size_change_ok
= true;
784 /* If the old symbol is from a dynamic object, and the new symbol is
785 a definition which is not from a dynamic object, then the new
786 symbol overrides the old symbol. Symbols from regular files
787 always take precedence over symbols from dynamic objects, even if
788 they are defined after the dynamic object in the link.
790 As above, we again permit a common symbol in a regular object to
791 override a definition in a shared object if the shared object
792 symbol is a function or is weak.
794 As above, we permit a non-weak definition in a shared object to
795 override a weak definition in a regular object. */
799 || (bfd_is_com_section (sec
)
800 && (h
->root
.type
== bfd_link_hash_defweak
801 || h
->type
== STT_FUNC
)))
804 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
806 || h
->root
.type
== bfd_link_hash_defweak
))
808 /* Change the hash table entry to undefined, and let
809 _bfd_generic_link_add_one_symbol do the right thing with the
812 h
->root
.type
= bfd_link_hash_undefined
;
813 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
814 *size_change_ok
= true;
817 olddyncommon
= false;
819 /* We again permit a type change when a common symbol may be
820 overriding a function. */
822 if (bfd_is_com_section (sec
))
823 *type_change_ok
= true;
825 /* This union may have been set to be non-NULL when this symbol
826 was seen in a dynamic object. We must force the union to be
827 NULL, so that it is correct for a regular symbol. */
829 h
->verinfo
.vertree
= NULL
;
831 /* In this special case, if H is the target of an indirection,
832 we want the caller to frob with H rather than with the
833 indirect symbol. That will permit the caller to redefine the
834 target of the indirection, rather than the indirect symbol
835 itself. FIXME: This will break the -y option if we store a
836 symbol with a different name. */
840 /* Handle the special case of a new common symbol merging with an
841 old symbol that looks like it might be a common symbol defined in
842 a shared object. Note that we have already handled the case in
843 which a new common symbol should simply override the definition
844 in the shared library. */
847 && bfd_is_com_section (sec
)
850 /* It would be best if we could set the hash table entry to a
851 common symbol, but we don't know what to use for the section
853 if (! ((*info
->callbacks
->multiple_common
)
854 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
855 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
858 /* If the predumed common symbol in the dynamic object is
859 larger, pretend that the new symbol has its size. */
861 if (h
->size
> *pvalue
)
864 /* FIXME: We no longer know the alignment required by the symbol
865 in the dynamic object, so we just wind up using the one from
866 the regular object. */
869 olddyncommon
= false;
871 h
->root
.type
= bfd_link_hash_undefined
;
872 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
874 *size_change_ok
= true;
875 *type_change_ok
= true;
877 h
->verinfo
.vertree
= NULL
;
880 /* Handle the special case of a weak definition in a regular object
881 followed by a non-weak definition in a shared object. In this
882 case, we prefer the definition in the shared object unless it
883 comes from a DT_NEEDED entry of a shared object, in which case,
884 the DT_NEEDED entry may not be required at the run time. */
887 && h
->root
.type
== bfd_link_hash_defweak
892 /* To make this work we have to frob the flags so that the rest
893 of the code does not think we are using the regular
895 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
896 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
897 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
898 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
899 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
900 | ELF_LINK_HASH_DEF_DYNAMIC
);
902 /* If H is the target of an indirection, we want the caller to
903 use H rather than the indirect symbol. Otherwise if we are
904 defining a new indirect symbol we will wind up attaching it
905 to the entry we are overriding. */
909 /* Handle the special case of a non-weak definition in a shared
910 object followed by a weak definition in a regular object. In
911 this case we prefer to definition in the shared object. To make
912 this work we have to tell the caller to not treat the new symbol
916 && h
->root
.type
!= bfd_link_hash_defweak
925 /* This function is called to create an indirect symbol from the
926 default for the symbol with the default version if needed. The
927 symbol is described by H, NAME, SYM, SEC, VALUE, and OVERRIDE. We
928 set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED
929 indicates if it comes from a DT_NEEDED entry of a shared object. */
932 elf_add_default_symbol (abfd
, info
, h
, name
, sym
, sec
, value
,
933 dynsym
, override
, dt_needed
)
935 struct bfd_link_info
*info
;
936 struct elf_link_hash_entry
*h
;
938 Elf_Internal_Sym
*sym
;
945 boolean type_change_ok
;
946 boolean size_change_ok
;
948 struct elf_link_hash_entry
*hi
;
949 struct elf_backend_data
*bed
;
954 /* If this symbol has a version, and it is the default version, we
955 create an indirect symbol from the default name to the fully
956 decorated name. This will cause external references which do not
957 specify a version to be bound to this version of the symbol. */
958 p
= strchr (name
, ELF_VER_CHR
);
959 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
964 /* We are overridden by an old defition. We need to check if we
965 need to crreate the indirect symbol from the default name. */
966 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, true,
968 BFD_ASSERT (hi
!= NULL
);
971 while (hi
->root
.type
== bfd_link_hash_indirect
972 || hi
->root
.type
== bfd_link_hash_warning
)
974 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
980 bed
= get_elf_backend_data (abfd
);
981 collect
= bed
->collect
;
982 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
984 shortname
= bfd_hash_allocate (&info
->hash
->table
,
985 (size_t) (p
- name
+ 1));
986 if (shortname
== NULL
)
988 strncpy (shortname
, name
, (size_t) (p
- name
));
989 shortname
[p
- name
] = '\0';
991 /* We are going to create a new symbol. Merge it with any existing
992 symbol with this name. For the purposes of the merge, act as
993 though we were defining the symbol we just defined, although we
994 actually going to define an indirect symbol. */
995 type_change_ok
= false;
996 size_change_ok
= false;
997 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, sec
, value
,
998 &hi
, &override
, &type_change_ok
,
999 &size_change_ok
, dt_needed
))
1004 if (! (_bfd_generic_link_add_one_symbol
1005 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1006 (bfd_vma
) 0, name
, false, collect
,
1007 (struct bfd_link_hash_entry
**) &hi
)))
1012 /* In this case the symbol named SHORTNAME is overriding the
1013 indirect symbol we want to add. We were planning on making
1014 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1015 is the name without a version. NAME is the fully versioned
1016 name, and it is the default version.
1018 Overriding means that we already saw a definition for the
1019 symbol SHORTNAME in a regular object, and it is overriding
1020 the symbol defined in the dynamic object.
1022 When this happens, we actually want to change NAME, the
1023 symbol we just added, to refer to SHORTNAME. This will cause
1024 references to NAME in the shared object to become references
1025 to SHORTNAME in the regular object. This is what we expect
1026 when we override a function in a shared object: that the
1027 references in the shared object will be mapped to the
1028 definition in the regular object. */
1030 while (hi
->root
.type
== bfd_link_hash_indirect
1031 || hi
->root
.type
== bfd_link_hash_warning
)
1032 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1034 h
->root
.type
= bfd_link_hash_indirect
;
1035 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1036 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1038 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1039 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1040 if (hi
->elf_link_hash_flags
1041 & (ELF_LINK_HASH_REF_REGULAR
1042 | ELF_LINK_HASH_DEF_REGULAR
))
1044 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1049 /* Now set HI to H, so that the following code will set the
1050 other fields correctly. */
1054 /* If there is a duplicate definition somewhere, then HI may not
1055 point to an indirect symbol. We will have reported an error to
1056 the user in that case. */
1058 if (hi
->root
.type
== bfd_link_hash_indirect
)
1060 struct elf_link_hash_entry
*ht
;
1062 /* If the symbol became indirect, then we assume that we have
1063 not seen a definition before. */
1064 BFD_ASSERT ((hi
->elf_link_hash_flags
1065 & (ELF_LINK_HASH_DEF_DYNAMIC
1066 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1068 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1069 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1071 /* See if the new flags lead us to realize that the symbol must
1078 || ((hi
->elf_link_hash_flags
1079 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1084 if ((hi
->elf_link_hash_flags
1085 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1091 /* We also need to define an indirection from the nondefault version
1094 shortname
= bfd_hash_allocate (&info
->hash
->table
, strlen (name
));
1095 if (shortname
== NULL
)
1097 strncpy (shortname
, name
, (size_t) (p
- name
));
1098 strcpy (shortname
+ (p
- name
), p
+ 1);
1100 /* Once again, merge with any existing symbol. */
1101 type_change_ok
= false;
1102 size_change_ok
= false;
1103 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, sec
, value
,
1104 &hi
, &override
, &type_change_ok
,
1105 &size_change_ok
, dt_needed
))
1110 /* Here SHORTNAME is a versioned name, so we don't expect to see
1111 the type of override we do in the case above. */
1112 (*_bfd_error_handler
)
1113 (_("%s: warning: unexpected redefinition of `%s'"),
1114 bfd_archive_filename (abfd
), shortname
);
1118 if (! (_bfd_generic_link_add_one_symbol
1119 (info
, abfd
, shortname
, BSF_INDIRECT
,
1120 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1121 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1124 /* If there is a duplicate definition somewhere, then HI may not
1125 point to an indirect symbol. We will have reported an error
1126 to the user in that case. */
1128 if (hi
->root
.type
== bfd_link_hash_indirect
)
1130 /* If the symbol became indirect, then we assume that we have
1131 not seen a definition before. */
1132 BFD_ASSERT ((hi
->elf_link_hash_flags
1133 & (ELF_LINK_HASH_DEF_DYNAMIC
1134 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1136 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1138 /* See if the new flags lead us to realize that the symbol
1145 || ((hi
->elf_link_hash_flags
1146 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1151 if ((hi
->elf_link_hash_flags
1152 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1162 /* Add symbols from an ELF object file to the linker hash table. */
1165 elf_link_add_object_symbols (abfd
, info
)
1167 struct bfd_link_info
*info
;
1169 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
1170 const Elf_Internal_Sym
*,
1171 const char **, flagword
*,
1172 asection
**, bfd_vma
*));
1173 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
1174 asection
*, const Elf_Internal_Rela
*));
1176 Elf_Internal_Shdr
*hdr
;
1177 Elf_Internal_Shdr
*shndx_hdr
;
1178 bfd_size_type symcount
;
1179 bfd_size_type extsymcount
;
1180 bfd_size_type extsymoff
;
1181 Elf_External_Sym
*buf
= NULL
;
1182 Elf_External_Sym_Shndx
*shndx_buf
= NULL
;
1183 Elf_External_Sym_Shndx
*shndx
;
1184 struct elf_link_hash_entry
**sym_hash
;
1186 Elf_External_Versym
*extversym
= NULL
;
1187 Elf_External_Versym
*ever
;
1188 Elf_External_Dyn
*dynbuf
= NULL
;
1189 struct elf_link_hash_entry
*weaks
;
1190 Elf_External_Sym
*esym
;
1191 Elf_External_Sym
*esymend
;
1192 struct elf_backend_data
*bed
;
1194 struct elf_link_hash_table
* hash_table
;
1198 hash_table
= elf_hash_table (info
);
1200 bed
= get_elf_backend_data (abfd
);
1201 add_symbol_hook
= bed
->elf_add_symbol_hook
;
1202 collect
= bed
->collect
;
1204 if ((abfd
->flags
& DYNAMIC
) == 0)
1210 /* You can't use -r against a dynamic object. Also, there's no
1211 hope of using a dynamic object which does not exactly match
1212 the format of the output file. */
1213 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
1215 bfd_set_error (bfd_error_invalid_operation
);
1220 /* As a GNU extension, any input sections which are named
1221 .gnu.warning.SYMBOL are treated as warning symbols for the given
1222 symbol. This differs from .gnu.warning sections, which generate
1223 warnings when they are included in an output file. */
1228 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1232 name
= bfd_get_section_name (abfd
, s
);
1233 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1238 name
+= sizeof ".gnu.warning." - 1;
1240 /* If this is a shared object, then look up the symbol
1241 in the hash table. If it is there, and it is already
1242 been defined, then we will not be using the entry
1243 from this shared object, so we don't need to warn.
1244 FIXME: If we see the definition in a regular object
1245 later on, we will warn, but we shouldn't. The only
1246 fix is to keep track of what warnings we are supposed
1247 to emit, and then handle them all at the end of the
1249 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
1251 struct elf_link_hash_entry
*h
;
1253 h
= elf_link_hash_lookup (hash_table
, name
,
1254 false, false, true);
1256 /* FIXME: What about bfd_link_hash_common? */
1258 && (h
->root
.type
== bfd_link_hash_defined
1259 || h
->root
.type
== bfd_link_hash_defweak
))
1261 /* We don't want to issue this warning. Clobber
1262 the section size so that the warning does not
1263 get copied into the output file. */
1269 sz
= bfd_section_size (abfd
, s
);
1270 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
1274 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
1279 if (! (_bfd_generic_link_add_one_symbol
1280 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
1281 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
1284 if (! info
->relocateable
)
1286 /* Clobber the section size so that the warning does
1287 not get copied into the output file. */
1294 /* If this is a dynamic object, we always link against the .dynsym
1295 symbol table, not the .symtab symbol table. The dynamic linker
1296 will only see the .dynsym symbol table, so there is no reason to
1297 look at .symtab for a dynamic object. */
1299 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
1301 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1302 shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
1306 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1312 /* Read in any version definitions. */
1314 if (! _bfd_elf_slurp_version_tables (abfd
))
1317 /* Read in the symbol versions, but don't bother to convert them
1318 to internal format. */
1319 if (elf_dynversym (abfd
) != 0)
1321 Elf_Internal_Shdr
*versymhdr
;
1323 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1324 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
1325 if (extversym
== NULL
)
1327 amt
= versymhdr
->sh_size
;
1328 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1329 || bfd_bread ((PTR
) extversym
, amt
, abfd
) != amt
)
1334 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1336 /* The sh_info field of the symtab header tells us where the
1337 external symbols start. We don't care about the local symbols at
1339 if (elf_bad_symtab (abfd
))
1341 extsymcount
= symcount
;
1346 extsymcount
= symcount
- hdr
->sh_info
;
1347 extsymoff
= hdr
->sh_info
;
1350 amt
= extsymcount
* sizeof (Elf_External_Sym
);
1351 buf
= (Elf_External_Sym
*) bfd_malloc (amt
);
1352 if (buf
== NULL
&& extsymcount
!= 0)
1355 if (shndx_hdr
!= NULL
&& shndx_hdr
->sh_size
!= 0)
1357 amt
= extsymcount
* sizeof (Elf_External_Sym_Shndx
);
1358 shndx_buf
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
1359 if (shndx_buf
== NULL
&& extsymcount
!= 0)
1363 /* We store a pointer to the hash table entry for each external
1365 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
1366 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
1367 if (sym_hash
== NULL
)
1369 elf_sym_hashes (abfd
) = sym_hash
;
1375 /* If we are creating a shared library, create all the dynamic
1376 sections immediately. We need to attach them to something,
1377 so we attach them to this BFD, provided it is the right
1378 format. FIXME: If there are no input BFD's of the same
1379 format as the output, we can't make a shared library. */
1381 && is_elf_hash_table (info
)
1382 && ! hash_table
->dynamic_sections_created
1383 && abfd
->xvec
== info
->hash
->creator
)
1385 if (! elf_link_create_dynamic_sections (abfd
, info
))
1389 else if (! is_elf_hash_table (info
))
1396 bfd_size_type oldsize
;
1397 bfd_size_type strindex
;
1399 /* Find the name to use in a DT_NEEDED entry that refers to this
1400 object. If the object has a DT_SONAME entry, we use it.
1401 Otherwise, if the generic linker stuck something in
1402 elf_dt_name, we use that. Otherwise, we just use the file
1403 name. If the generic linker put a null string into
1404 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1405 there is a DT_SONAME entry. */
1407 name
= bfd_get_filename (abfd
);
1408 if (elf_dt_name (abfd
) != NULL
)
1410 name
= elf_dt_name (abfd
);
1413 if (elf_dt_soname (abfd
) != NULL
)
1419 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1422 Elf_External_Dyn
*extdyn
;
1423 Elf_External_Dyn
*extdynend
;
1425 unsigned long shlink
;
1429 dynbuf
= (Elf_External_Dyn
*) bfd_malloc (s
->_raw_size
);
1433 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1434 (file_ptr
) 0, s
->_raw_size
))
1437 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1440 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1443 /* The shared libraries distributed with hpux11 have a bogus
1444 sh_link field for the ".dynamic" section. This code detects
1445 when SHLINK refers to a section that is not a string table
1446 and tries to find the string table for the ".dynsym" section
1448 Elf_Internal_Shdr
*shdr
= elf_elfsections (abfd
)[shlink
];
1449 if (shdr
->sh_type
!= SHT_STRTAB
)
1451 asection
*ds
= bfd_get_section_by_name (abfd
, ".dynsym");
1452 int elfdsec
= _bfd_elf_section_from_bfd_section (abfd
, ds
);
1455 shlink
= elf_elfsections (abfd
)[elfdsec
]->sh_link
;
1460 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1463 for (; extdyn
< extdynend
; extdyn
++)
1465 Elf_Internal_Dyn dyn
;
1467 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1468 if (dyn
.d_tag
== DT_SONAME
)
1470 unsigned int tagv
= dyn
.d_un
.d_val
;
1471 name
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1475 if (dyn
.d_tag
== DT_NEEDED
)
1477 struct bfd_link_needed_list
*n
, **pn
;
1479 unsigned int tagv
= dyn
.d_un
.d_val
;
1481 amt
= sizeof (struct bfd_link_needed_list
);
1482 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1483 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1484 if (n
== NULL
|| fnm
== NULL
)
1486 anm
= bfd_alloc (abfd
, (bfd_size_type
) strlen (fnm
) + 1);
1493 for (pn
= & hash_table
->needed
;
1499 if (dyn
.d_tag
== DT_RUNPATH
)
1501 struct bfd_link_needed_list
*n
, **pn
;
1503 unsigned int tagv
= dyn
.d_un
.d_val
;
1505 /* When we see DT_RPATH before DT_RUNPATH, we have
1506 to clear runpath. Do _NOT_ bfd_release, as that
1507 frees all more recently bfd_alloc'd blocks as
1509 if (rpath
&& hash_table
->runpath
)
1510 hash_table
->runpath
= NULL
;
1512 amt
= sizeof (struct bfd_link_needed_list
);
1513 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1514 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1515 if (n
== NULL
|| fnm
== NULL
)
1517 anm
= bfd_alloc (abfd
, (bfd_size_type
) strlen (fnm
) + 1);
1524 for (pn
= & hash_table
->runpath
;
1532 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1533 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
1535 struct bfd_link_needed_list
*n
, **pn
;
1537 unsigned int tagv
= dyn
.d_un
.d_val
;
1539 amt
= sizeof (struct bfd_link_needed_list
);
1540 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1541 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1542 if (n
== NULL
|| fnm
== NULL
)
1544 anm
= bfd_alloc (abfd
, (bfd_size_type
) strlen (fnm
) + 1);
1551 for (pn
= & hash_table
->runpath
;
1564 /* We do not want to include any of the sections in a dynamic
1565 object in the output file. We hack by simply clobbering the
1566 list of sections in the BFD. This could be handled more
1567 cleanly by, say, a new section flag; the existing
1568 SEC_NEVER_LOAD flag is not the one we want, because that one
1569 still implies that the section takes up space in the output
1571 bfd_section_list_clear (abfd
);
1573 /* If this is the first dynamic object found in the link, create
1574 the special sections required for dynamic linking. */
1575 if (! hash_table
->dynamic_sections_created
)
1576 if (! elf_link_create_dynamic_sections (abfd
, info
))
1581 /* Add a DT_NEEDED entry for this dynamic object. */
1582 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
1583 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, name
, false);
1584 if (strindex
== (bfd_size_type
) -1)
1587 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
1590 Elf_External_Dyn
*dyncon
, *dynconend
;
1592 /* The hash table size did not change, which means that
1593 the dynamic object name was already entered. If we
1594 have already included this dynamic object in the
1595 link, just ignore it. There is no reason to include
1596 a particular dynamic object more than once. */
1597 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
1598 BFD_ASSERT (sdyn
!= NULL
);
1600 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1601 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1603 for (; dyncon
< dynconend
; dyncon
++)
1605 Elf_Internal_Dyn dyn
;
1607 elf_swap_dyn_in (hash_table
->dynobj
, dyncon
, & dyn
);
1608 if (dyn
.d_tag
== DT_NEEDED
1609 && dyn
.d_un
.d_val
== strindex
)
1613 if (extversym
!= NULL
)
1615 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
1621 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
1625 /* Save the SONAME, if there is one, because sometimes the
1626 linker emulation code will need to know it. */
1628 name
= basename (bfd_get_filename (abfd
));
1629 elf_dt_name (abfd
) = name
;
1632 pos
= hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
);
1633 amt
= extsymcount
* sizeof (Elf_External_Sym
);
1634 if (bfd_seek (abfd
, pos
, SEEK_SET
) != 0
1635 || bfd_bread ((PTR
) buf
, amt
, abfd
) != amt
)
1638 if (shndx_hdr
!= NULL
&& shndx_hdr
->sh_size
!= 0)
1640 amt
= extsymcount
* sizeof (Elf_External_Sym_Shndx
);
1641 pos
= shndx_hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym_Shndx
);
1642 if (bfd_seek (abfd
, pos
, SEEK_SET
) != 0
1643 || bfd_bread ((PTR
) shndx_buf
, amt
, abfd
) != amt
)
1649 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1650 esymend
= buf
+ extsymcount
;
1651 for (esym
= buf
, shndx
= shndx_buf
;
1653 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
),
1654 shndx
= (shndx
!= NULL
? shndx
+ 1 : NULL
))
1656 Elf_Internal_Sym sym
;
1662 struct elf_link_hash_entry
*h
;
1664 boolean size_change_ok
, type_change_ok
;
1665 boolean new_weakdef
;
1666 unsigned int old_alignment
;
1671 elf_swap_symbol_in (abfd
, esym
, shndx
, &sym
);
1673 flags
= BSF_NO_FLAGS
;
1675 value
= sym
.st_value
;
1678 bind
= ELF_ST_BIND (sym
.st_info
);
1679 if (bind
== STB_LOCAL
)
1681 /* This should be impossible, since ELF requires that all
1682 global symbols follow all local symbols, and that sh_info
1683 point to the first global symbol. Unfortunatealy, Irix 5
1687 else if (bind
== STB_GLOBAL
)
1689 if (sym
.st_shndx
!= SHN_UNDEF
1690 && sym
.st_shndx
!= SHN_COMMON
)
1693 else if (bind
== STB_WEAK
)
1697 /* Leave it up to the processor backend. */
1700 if (sym
.st_shndx
== SHN_UNDEF
)
1701 sec
= bfd_und_section_ptr
;
1702 else if (sym
.st_shndx
< SHN_LORESERVE
|| sym
.st_shndx
> SHN_HIRESERVE
)
1704 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1706 sec
= bfd_abs_section_ptr
;
1707 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1710 else if (sym
.st_shndx
== SHN_ABS
)
1711 sec
= bfd_abs_section_ptr
;
1712 else if (sym
.st_shndx
== SHN_COMMON
)
1714 sec
= bfd_com_section_ptr
;
1715 /* What ELF calls the size we call the value. What ELF
1716 calls the value we call the alignment. */
1717 value
= sym
.st_size
;
1721 /* Leave it up to the processor backend. */
1724 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1725 if (name
== (const char *) NULL
)
1728 if (add_symbol_hook
)
1730 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1734 /* The hook function sets the name to NULL if this symbol
1735 should be skipped for some reason. */
1736 if (name
== (const char *) NULL
)
1740 /* Sanity check that all possibilities were handled. */
1741 if (sec
== (asection
*) NULL
)
1743 bfd_set_error (bfd_error_bad_value
);
1747 if (bfd_is_und_section (sec
)
1748 || bfd_is_com_section (sec
))
1753 size_change_ok
= false;
1754 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1756 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1758 Elf_Internal_Versym iver
;
1759 unsigned int vernum
= 0;
1763 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1764 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1766 /* If this is a hidden symbol, or if it is not version
1767 1, we append the version name to the symbol name.
1768 However, we do not modify a non-hidden absolute
1769 symbol, because it might be the version symbol
1770 itself. FIXME: What if it isn't? */
1771 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1772 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1775 unsigned int namelen
;
1776 bfd_size_type newlen
;
1779 if (sym
.st_shndx
!= SHN_UNDEF
)
1781 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1783 (*_bfd_error_handler
)
1784 (_("%s: %s: invalid version %u (max %d)"),
1785 bfd_archive_filename (abfd
), name
, vernum
,
1786 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1787 bfd_set_error (bfd_error_bad_value
);
1790 else if (vernum
> 1)
1792 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1798 /* We cannot simply test for the number of
1799 entries in the VERNEED section since the
1800 numbers for the needed versions do not start
1802 Elf_Internal_Verneed
*t
;
1805 for (t
= elf_tdata (abfd
)->verref
;
1809 Elf_Internal_Vernaux
*a
;
1811 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1813 if (a
->vna_other
== vernum
)
1815 verstr
= a
->vna_nodename
;
1824 (*_bfd_error_handler
)
1825 (_("%s: %s: invalid needed version %d"),
1826 bfd_archive_filename (abfd
), name
, vernum
);
1827 bfd_set_error (bfd_error_bad_value
);
1832 namelen
= strlen (name
);
1833 newlen
= namelen
+ strlen (verstr
) + 2;
1834 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1837 newname
= (char *) bfd_alloc (abfd
, newlen
);
1838 if (newname
== NULL
)
1840 strcpy (newname
, name
);
1841 p
= newname
+ namelen
;
1843 /* If this is a defined non-hidden version symbol,
1844 we add another @ to the name. This indicates the
1845 default version of the symbol. */
1846 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1847 && sym
.st_shndx
!= SHN_UNDEF
)
1855 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1856 sym_hash
, &override
, &type_change_ok
,
1857 &size_change_ok
, dt_needed
))
1864 while (h
->root
.type
== bfd_link_hash_indirect
1865 || h
->root
.type
== bfd_link_hash_warning
)
1866 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1868 /* Remember the old alignment if this is a common symbol, so
1869 that we don't reduce the alignment later on. We can't
1870 check later, because _bfd_generic_link_add_one_symbol
1871 will set a default for the alignment which we want to
1873 if (h
->root
.type
== bfd_link_hash_common
)
1874 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1876 if (elf_tdata (abfd
)->verdef
!= NULL
1880 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1883 if (! (_bfd_generic_link_add_one_symbol
1884 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1885 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1889 while (h
->root
.type
== bfd_link_hash_indirect
1890 || h
->root
.type
== bfd_link_hash_warning
)
1891 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1894 new_weakdef
= false;
1897 && (flags
& BSF_WEAK
) != 0
1898 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1899 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1900 && h
->weakdef
== NULL
)
1902 /* Keep a list of all weak defined non function symbols from
1903 a dynamic object, using the weakdef field. Later in this
1904 function we will set the weakdef field to the correct
1905 value. We only put non-function symbols from dynamic
1906 objects on this list, because that happens to be the only
1907 time we need to know the normal symbol corresponding to a
1908 weak symbol, and the information is time consuming to
1909 figure out. If the weakdef field is not already NULL,
1910 then this symbol was already defined by some previous
1911 dynamic object, and we will be using that previous
1912 definition anyhow. */
1919 /* Set the alignment of a common symbol. */
1920 if (sym
.st_shndx
== SHN_COMMON
1921 && h
->root
.type
== bfd_link_hash_common
)
1925 align
= bfd_log2 (sym
.st_value
);
1926 if (align
> old_alignment
1927 /* Permit an alignment power of zero if an alignment of one
1928 is specified and no other alignments have been specified. */
1929 || (sym
.st_value
== 1 && old_alignment
== 0))
1930 h
->root
.u
.c
.p
->alignment_power
= align
;
1933 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1939 /* Remember the symbol size and type. */
1940 if (sym
.st_size
!= 0
1941 && (definition
|| h
->size
== 0))
1943 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1944 (*_bfd_error_handler
)
1945 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1946 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1947 bfd_archive_filename (abfd
));
1949 h
->size
= sym
.st_size
;
1952 /* If this is a common symbol, then we always want H->SIZE
1953 to be the size of the common symbol. The code just above
1954 won't fix the size if a common symbol becomes larger. We
1955 don't warn about a size change here, because that is
1956 covered by --warn-common. */
1957 if (h
->root
.type
== bfd_link_hash_common
)
1958 h
->size
= h
->root
.u
.c
.size
;
1960 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1961 && (definition
|| h
->type
== STT_NOTYPE
))
1963 if (h
->type
!= STT_NOTYPE
1964 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1965 && ! type_change_ok
)
1966 (*_bfd_error_handler
)
1967 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1968 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1969 bfd_archive_filename (abfd
));
1971 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1974 /* If st_other has a processor-specific meaning, specific code
1975 might be needed here. */
1976 if (sym
.st_other
!= 0)
1978 /* Combine visibilities, using the most constraining one. */
1979 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1980 unsigned char symvis
= ELF_ST_VISIBILITY (sym
.st_other
);
1982 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1983 h
->other
= sym
.st_other
;
1985 /* If neither has visibility, use the st_other of the
1986 definition. This is an arbitrary choice, since the
1987 other bits have no general meaning. */
1988 if (!symvis
&& !hvis
1989 && (definition
|| h
->other
== 0))
1990 h
->other
= sym
.st_other
;
1993 /* Set a flag in the hash table entry indicating the type of
1994 reference or definition we just found. Keep a count of
1995 the number of dynamic symbols we find. A dynamic symbol
1996 is one which is referenced or defined by both a regular
1997 object and a shared object. */
1998 old_flags
= h
->elf_link_hash_flags
;
2004 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
2005 if (bind
!= STB_WEAK
)
2006 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
2009 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
2011 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2012 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
2018 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
2020 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
2021 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
2022 | ELF_LINK_HASH_REF_REGULAR
)) != 0
2023 || (h
->weakdef
!= NULL
2025 && h
->weakdef
->dynindx
!= -1))
2029 h
->elf_link_hash_flags
|= new_flag
;
2031 /* Check to see if we need to add an indirect symbol for
2032 the default name. */
2033 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
2034 if (! elf_add_default_symbol (abfd
, info
, h
, name
, &sym
,
2035 &sec
, &value
, &dynsym
,
2036 override
, dt_needed
))
2039 if (dynsym
&& h
->dynindx
== -1)
2041 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2043 if (h
->weakdef
!= NULL
2045 && h
->weakdef
->dynindx
== -1)
2047 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2051 else if (dynsym
&& h
->dynindx
!= -1)
2052 /* If the symbol already has a dynamic index, but
2053 visibility says it should not be visible, turn it into
2055 switch (ELF_ST_VISIBILITY (h
->other
))
2059 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2063 if (dt_needed
&& definition
2064 && (h
->elf_link_hash_flags
2065 & ELF_LINK_HASH_REF_REGULAR
) != 0)
2067 bfd_size_type oldsize
;
2068 bfd_size_type strindex
;
2070 if (! is_elf_hash_table (info
))
2073 /* The symbol from a DT_NEEDED object is referenced from
2074 the regular object to create a dynamic executable. We
2075 have to make sure there is a DT_NEEDED entry for it. */
2078 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
2079 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
,
2080 elf_dt_soname (abfd
), false);
2081 if (strindex
== (bfd_size_type
) -1)
2084 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
2087 Elf_External_Dyn
*dyncon
, *dynconend
;
2089 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
,
2091 BFD_ASSERT (sdyn
!= NULL
);
2093 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
2094 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
2096 for (; dyncon
< dynconend
; dyncon
++)
2098 Elf_Internal_Dyn dyn
;
2100 elf_swap_dyn_in (hash_table
->dynobj
,
2102 BFD_ASSERT (dyn
.d_tag
!= DT_NEEDED
||
2103 dyn
.d_un
.d_val
!= strindex
);
2107 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
2113 /* Now set the weakdefs field correctly for all the weak defined
2114 symbols we found. The only way to do this is to search all the
2115 symbols. Since we only need the information for non functions in
2116 dynamic objects, that's the only time we actually put anything on
2117 the list WEAKS. We need this information so that if a regular
2118 object refers to a symbol defined weakly in a dynamic object, the
2119 real symbol in the dynamic object is also put in the dynamic
2120 symbols; we also must arrange for both symbols to point to the
2121 same memory location. We could handle the general case of symbol
2122 aliasing, but a general symbol alias can only be generated in
2123 assembler code, handling it correctly would be very time
2124 consuming, and other ELF linkers don't handle general aliasing
2126 while (weaks
!= NULL
)
2128 struct elf_link_hash_entry
*hlook
;
2131 struct elf_link_hash_entry
**hpp
;
2132 struct elf_link_hash_entry
**hppend
;
2135 weaks
= hlook
->weakdef
;
2136 hlook
->weakdef
= NULL
;
2138 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
2139 || hlook
->root
.type
== bfd_link_hash_defweak
2140 || hlook
->root
.type
== bfd_link_hash_common
2141 || hlook
->root
.type
== bfd_link_hash_indirect
);
2142 slook
= hlook
->root
.u
.def
.section
;
2143 vlook
= hlook
->root
.u
.def
.value
;
2145 hpp
= elf_sym_hashes (abfd
);
2146 hppend
= hpp
+ extsymcount
;
2147 for (; hpp
< hppend
; hpp
++)
2149 struct elf_link_hash_entry
*h
;
2152 if (h
!= NULL
&& h
!= hlook
2153 && h
->root
.type
== bfd_link_hash_defined
2154 && h
->root
.u
.def
.section
== slook
2155 && h
->root
.u
.def
.value
== vlook
)
2159 /* If the weak definition is in the list of dynamic
2160 symbols, make sure the real definition is put there
2162 if (hlook
->dynindx
!= -1
2163 && h
->dynindx
== -1)
2165 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2169 /* If the real definition is in the list of dynamic
2170 symbols, make sure the weak definition is put there
2171 as well. If we don't do this, then the dynamic
2172 loader might not merge the entries for the real
2173 definition and the weak definition. */
2174 if (h
->dynindx
!= -1
2175 && hlook
->dynindx
== -1)
2177 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
2192 if (extversym
!= NULL
)
2198 /* If this object is the same format as the output object, and it is
2199 not a shared library, then let the backend look through the
2202 This is required to build global offset table entries and to
2203 arrange for dynamic relocs. It is not required for the
2204 particular common case of linking non PIC code, even when linking
2205 against shared libraries, but unfortunately there is no way of
2206 knowing whether an object file has been compiled PIC or not.
2207 Looking through the relocs is not particularly time consuming.
2208 The problem is that we must either (1) keep the relocs in memory,
2209 which causes the linker to require additional runtime memory or
2210 (2) read the relocs twice from the input file, which wastes time.
2211 This would be a good case for using mmap.
2213 I have no idea how to handle linking PIC code into a file of a
2214 different format. It probably can't be done. */
2215 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
2217 && abfd
->xvec
== info
->hash
->creator
2218 && check_relocs
!= NULL
)
2222 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2224 Elf_Internal_Rela
*internal_relocs
;
2227 if ((o
->flags
& SEC_RELOC
) == 0
2228 || o
->reloc_count
== 0
2229 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
2230 && (o
->flags
& SEC_DEBUGGING
) != 0)
2231 || bfd_is_abs_section (o
->output_section
))
2234 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2235 (abfd
, o
, (PTR
) NULL
,
2236 (Elf_Internal_Rela
*) NULL
,
2237 info
->keep_memory
));
2238 if (internal_relocs
== NULL
)
2241 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2243 if (! info
->keep_memory
)
2244 free (internal_relocs
);
2251 /* If this is a non-traditional, non-relocateable link, try to
2252 optimize the handling of the .stab/.stabstr sections. */
2254 && ! info
->relocateable
2255 && ! info
->traditional_format
2256 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2257 && is_elf_hash_table (info
)
2258 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2260 asection
*stab
, *stabstr
;
2262 stab
= bfd_get_section_by_name (abfd
, ".stab");
2263 if (stab
!= NULL
&& !(stab
->flags
& SEC_MERGE
))
2265 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2267 if (stabstr
!= NULL
)
2269 struct bfd_elf_section_data
*secdata
;
2271 secdata
= elf_section_data (stab
);
2272 if (! _bfd_link_section_stabs (abfd
,
2273 & hash_table
->stab_info
,
2275 &secdata
->sec_info
))
2277 if (secdata
->sec_info
)
2278 secdata
->sec_info_type
= ELF_INFO_TYPE_STABS
;
2283 if (! info
->relocateable
&& ! dynamic
2284 && is_elf_hash_table (info
))
2288 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2289 if (s
->flags
& SEC_MERGE
)
2291 struct bfd_elf_section_data
*secdata
;
2293 secdata
= elf_section_data (s
);
2294 if (! _bfd_merge_section (abfd
,
2295 & hash_table
->merge_info
,
2296 s
, &secdata
->sec_info
))
2298 else if (secdata
->sec_info
)
2299 secdata
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
2310 if (extversym
!= NULL
)
2315 /* Create some sections which will be filled in with dynamic linking
2316 information. ABFD is an input file which requires dynamic sections
2317 to be created. The dynamic sections take up virtual memory space
2318 when the final executable is run, so we need to create them before
2319 addresses are assigned to the output sections. We work out the
2320 actual contents and size of these sections later. */
2323 elf_link_create_dynamic_sections (abfd
, info
)
2325 struct bfd_link_info
*info
;
2328 register asection
*s
;
2329 struct elf_link_hash_entry
*h
;
2330 struct elf_backend_data
*bed
;
2332 if (! is_elf_hash_table (info
))
2335 if (elf_hash_table (info
)->dynamic_sections_created
)
2338 /* Make sure that all dynamic sections use the same input BFD. */
2339 if (elf_hash_table (info
)->dynobj
== NULL
)
2340 elf_hash_table (info
)->dynobj
= abfd
;
2342 abfd
= elf_hash_table (info
)->dynobj
;
2344 /* Note that we set the SEC_IN_MEMORY flag for all of these
2346 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2347 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2349 /* A dynamically linked executable has a .interp section, but a
2350 shared library does not. */
2353 s
= bfd_make_section (abfd
, ".interp");
2355 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2359 if (! info
->traditional_format
2360 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
2362 s
= bfd_make_section (abfd
, ".eh_frame_hdr");
2364 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2365 || ! bfd_set_section_alignment (abfd
, s
, 2))
2369 /* Create sections to hold version informations. These are removed
2370 if they are not needed. */
2371 s
= bfd_make_section (abfd
, ".gnu.version_d");
2373 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2374 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2377 s
= bfd_make_section (abfd
, ".gnu.version");
2379 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2380 || ! bfd_set_section_alignment (abfd
, s
, 1))
2383 s
= bfd_make_section (abfd
, ".gnu.version_r");
2385 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2386 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2389 s
= bfd_make_section (abfd
, ".dynsym");
2391 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2392 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2395 s
= bfd_make_section (abfd
, ".dynstr");
2397 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2400 /* Create a strtab to hold the dynamic symbol names. */
2401 if (elf_hash_table (info
)->dynstr
== NULL
)
2403 elf_hash_table (info
)->dynstr
= _bfd_elf_strtab_init ();
2404 if (elf_hash_table (info
)->dynstr
== NULL
)
2408 s
= bfd_make_section (abfd
, ".dynamic");
2410 || ! bfd_set_section_flags (abfd
, s
, flags
)
2411 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2414 /* The special symbol _DYNAMIC is always set to the start of the
2415 .dynamic section. This call occurs before we have processed the
2416 symbols for any dynamic object, so we don't have to worry about
2417 overriding a dynamic definition. We could set _DYNAMIC in a
2418 linker script, but we only want to define it if we are, in fact,
2419 creating a .dynamic section. We don't want to define it if there
2420 is no .dynamic section, since on some ELF platforms the start up
2421 code examines it to decide how to initialize the process. */
2423 if (! (_bfd_generic_link_add_one_symbol
2424 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2425 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2426 (struct bfd_link_hash_entry
**) &h
)))
2428 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2429 h
->type
= STT_OBJECT
;
2432 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2435 bed
= get_elf_backend_data (abfd
);
2437 s
= bfd_make_section (abfd
, ".hash");
2439 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2440 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2442 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2444 /* Let the backend create the rest of the sections. This lets the
2445 backend set the right flags. The backend will normally create
2446 the .got and .plt sections. */
2447 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2450 elf_hash_table (info
)->dynamic_sections_created
= true;
2455 /* Add an entry to the .dynamic table. */
2458 elf_add_dynamic_entry (info
, tag
, val
)
2459 struct bfd_link_info
*info
;
2463 Elf_Internal_Dyn dyn
;
2466 bfd_size_type newsize
;
2467 bfd_byte
*newcontents
;
2469 if (! is_elf_hash_table (info
))
2472 dynobj
= elf_hash_table (info
)->dynobj
;
2474 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2475 BFD_ASSERT (s
!= NULL
);
2477 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2478 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2479 if (newcontents
== NULL
)
2483 dyn
.d_un
.d_val
= val
;
2484 elf_swap_dyn_out (dynobj
, &dyn
,
2485 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2487 s
->_raw_size
= newsize
;
2488 s
->contents
= newcontents
;
2493 /* Record a new local dynamic symbol. */
2496 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2497 struct bfd_link_info
*info
;
2501 struct elf_link_local_dynamic_entry
*entry
;
2502 struct elf_link_hash_table
*eht
;
2503 struct elf_strtab_hash
*dynstr
;
2504 Elf_External_Sym esym
;
2505 Elf_External_Sym_Shndx eshndx
;
2506 Elf_External_Sym_Shndx
*shndx
;
2507 unsigned long dynstr_index
;
2512 if (! is_elf_hash_table (info
))
2515 /* See if the entry exists already. */
2516 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2517 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2520 entry
= (struct elf_link_local_dynamic_entry
*)
2521 bfd_alloc (input_bfd
, (bfd_size_type
) sizeof (*entry
));
2525 /* Go find the symbol, so that we can find it's name. */
2526 amt
= sizeof (Elf_External_Sym
);
2527 pos
= elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
+ input_indx
* amt
;
2528 if (bfd_seek (input_bfd
, pos
, SEEK_SET
) != 0
2529 || bfd_bread ((PTR
) &esym
, amt
, input_bfd
) != amt
)
2532 if (elf_tdata (input_bfd
)->symtab_shndx_hdr
.sh_size
!= 0)
2534 amt
= sizeof (Elf_External_Sym_Shndx
);
2535 pos
= elf_tdata (input_bfd
)->symtab_shndx_hdr
.sh_offset
;
2536 pos
+= input_indx
* amt
;
2538 if (bfd_seek (input_bfd
, pos
, SEEK_SET
) != 0
2539 || bfd_bread ((PTR
) shndx
, amt
, input_bfd
) != amt
)
2542 elf_swap_symbol_in (input_bfd
, &esym
, shndx
, &entry
->isym
);
2544 name
= (bfd_elf_string_from_elf_section
2545 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2546 entry
->isym
.st_name
));
2548 dynstr
= elf_hash_table (info
)->dynstr
;
2551 /* Create a strtab to hold the dynamic symbol names. */
2552 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
2557 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, false);
2558 if (dynstr_index
== (unsigned long) -1)
2560 entry
->isym
.st_name
= dynstr_index
;
2562 eht
= elf_hash_table (info
);
2564 entry
->next
= eht
->dynlocal
;
2565 eht
->dynlocal
= entry
;
2566 entry
->input_bfd
= input_bfd
;
2567 entry
->input_indx
= input_indx
;
2570 /* Whatever binding the symbol had before, it's now local. */
2572 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2574 /* The dynindx will be set at the end of size_dynamic_sections. */
2579 /* Read and swap the relocs from the section indicated by SHDR. This
2580 may be either a REL or a RELA section. The relocations are
2581 translated into RELA relocations and stored in INTERNAL_RELOCS,
2582 which should have already been allocated to contain enough space.
2583 The EXTERNAL_RELOCS are a buffer where the external form of the
2584 relocations should be stored.
2586 Returns false if something goes wrong. */
2589 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2592 Elf_Internal_Shdr
*shdr
;
2593 PTR external_relocs
;
2594 Elf_Internal_Rela
*internal_relocs
;
2596 struct elf_backend_data
*bed
;
2599 /* If there aren't any relocations, that's OK. */
2603 /* Position ourselves at the start of the section. */
2604 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2607 /* Read the relocations. */
2608 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2611 bed
= get_elf_backend_data (abfd
);
2613 /* Convert the external relocations to the internal format. */
2614 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2616 Elf_External_Rel
*erel
;
2617 Elf_External_Rel
*erelend
;
2618 Elf_Internal_Rela
*irela
;
2619 Elf_Internal_Rel
*irel
;
2621 erel
= (Elf_External_Rel
*) external_relocs
;
2622 erelend
= erel
+ NUM_SHDR_ENTRIES (shdr
);
2623 irela
= internal_relocs
;
2624 amt
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
2625 irel
= bfd_alloc (abfd
, amt
);
2626 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2630 if (bed
->s
->swap_reloc_in
)
2631 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2633 elf_swap_reloc_in (abfd
, erel
, irel
);
2635 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2637 irela
[i
].r_offset
= irel
[i
].r_offset
;
2638 irela
[i
].r_info
= irel
[i
].r_info
;
2639 irela
[i
].r_addend
= 0;
2645 Elf_External_Rela
*erela
;
2646 Elf_External_Rela
*erelaend
;
2647 Elf_Internal_Rela
*irela
;
2649 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2651 erela
= (Elf_External_Rela
*) external_relocs
;
2652 erelaend
= erela
+ NUM_SHDR_ENTRIES (shdr
);
2653 irela
= internal_relocs
;
2654 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2656 if (bed
->s
->swap_reloca_in
)
2657 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2659 elf_swap_reloca_in (abfd
, erela
, irela
);
2666 /* Read and swap the relocs for a section O. They may have been
2667 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2668 not NULL, they are used as buffers to read into. They are known to
2669 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2670 the return value is allocated using either malloc or bfd_alloc,
2671 according to the KEEP_MEMORY argument. If O has two relocation
2672 sections (both REL and RELA relocations), then the REL_HDR
2673 relocations will appear first in INTERNAL_RELOCS, followed by the
2674 REL_HDR2 relocations. */
2677 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2681 PTR external_relocs
;
2682 Elf_Internal_Rela
*internal_relocs
;
2683 boolean keep_memory
;
2685 Elf_Internal_Shdr
*rel_hdr
;
2687 Elf_Internal_Rela
*alloc2
= NULL
;
2688 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2690 if (elf_section_data (o
)->relocs
!= NULL
)
2691 return elf_section_data (o
)->relocs
;
2693 if (o
->reloc_count
== 0)
2696 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2698 if (internal_relocs
== NULL
)
2702 size
= o
->reloc_count
;
2703 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2705 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2707 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2708 if (internal_relocs
== NULL
)
2712 if (external_relocs
== NULL
)
2714 bfd_size_type size
= rel_hdr
->sh_size
;
2716 if (elf_section_data (o
)->rel_hdr2
)
2717 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
2718 alloc1
= (PTR
) bfd_malloc (size
);
2721 external_relocs
= alloc1
;
2724 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2728 if (!elf_link_read_relocs_from_section
2730 elf_section_data (o
)->rel_hdr2
,
2731 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2732 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2733 * bed
->s
->int_rels_per_ext_rel
)))
2736 /* Cache the results for next time, if we can. */
2738 elf_section_data (o
)->relocs
= internal_relocs
;
2743 /* Don't free alloc2, since if it was allocated we are passing it
2744 back (under the name of internal_relocs). */
2746 return internal_relocs
;
2756 /* Record an assignment to a symbol made by a linker script. We need
2757 this in case some dynamic object refers to this symbol. */
2760 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2761 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2762 struct bfd_link_info
*info
;
2766 struct elf_link_hash_entry
*h
;
2768 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2771 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2775 if (h
->root
.type
== bfd_link_hash_new
)
2776 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_ELF
;
2778 /* If this symbol is being provided by the linker script, and it is
2779 currently defined by a dynamic object, but not by a regular
2780 object, then mark it as undefined so that the generic linker will
2781 force the correct value. */
2783 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2784 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2785 h
->root
.type
= bfd_link_hash_undefined
;
2787 /* If this symbol is not being provided by the linker script, and it is
2788 currently defined by a dynamic object, but not by a regular object,
2789 then clear out any version information because the symbol will not be
2790 associated with the dynamic object any more. */
2792 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2793 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2794 h
->verinfo
.verdef
= NULL
;
2796 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2798 /* When possible, keep the original type of the symbol. */
2799 if (h
->type
== STT_NOTYPE
)
2800 h
->type
= STT_OBJECT
;
2802 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2803 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2805 && h
->dynindx
== -1)
2807 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2810 /* If this is a weak defined symbol, and we know a corresponding
2811 real symbol from the same dynamic object, make sure the real
2812 symbol is also made into a dynamic symbol. */
2813 if (h
->weakdef
!= NULL
2814 && h
->weakdef
->dynindx
== -1)
2816 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2824 /* This structure is used to pass information to
2825 elf_link_assign_sym_version. */
2827 struct elf_assign_sym_version_info
2831 /* General link information. */
2832 struct bfd_link_info
*info
;
2834 struct bfd_elf_version_tree
*verdefs
;
2835 /* Whether we had a failure. */
2839 /* This structure is used to pass information to
2840 elf_link_find_version_dependencies. */
2842 struct elf_find_verdep_info
2846 /* General link information. */
2847 struct bfd_link_info
*info
;
2848 /* The number of dependencies. */
2850 /* Whether we had a failure. */
2854 /* Array used to determine the number of hash table buckets to use
2855 based on the number of symbols there are. If there are fewer than
2856 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2857 fewer than 37 we use 17 buckets, and so forth. We never use more
2858 than 32771 buckets. */
2860 static const size_t elf_buckets
[] =
2862 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2866 /* Compute bucket count for hashing table. We do not use a static set
2867 of possible tables sizes anymore. Instead we determine for all
2868 possible reasonable sizes of the table the outcome (i.e., the
2869 number of collisions etc) and choose the best solution. The
2870 weighting functions are not too simple to allow the table to grow
2871 without bounds. Instead one of the weighting factors is the size.
2872 Therefore the result is always a good payoff between few collisions
2873 (= short chain lengths) and table size. */
2875 compute_bucket_count (info
)
2876 struct bfd_link_info
*info
;
2878 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2879 size_t best_size
= 0;
2880 unsigned long int *hashcodes
;
2881 unsigned long int *hashcodesp
;
2882 unsigned long int i
;
2885 /* Compute the hash values for all exported symbols. At the same
2886 time store the values in an array so that we could use them for
2889 amt
*= sizeof (unsigned long int);
2890 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
2891 if (hashcodes
== NULL
)
2893 hashcodesp
= hashcodes
;
2895 /* Put all hash values in HASHCODES. */
2896 elf_link_hash_traverse (elf_hash_table (info
),
2897 elf_collect_hash_codes
, &hashcodesp
);
2899 /* We have a problem here. The following code to optimize the table
2900 size requires an integer type with more the 32 bits. If
2901 BFD_HOST_U_64_BIT is set we know about such a type. */
2902 #ifdef BFD_HOST_U_64_BIT
2903 if (info
->optimize
== true)
2905 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2908 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2909 unsigned long int *counts
;
2911 /* Possible optimization parameters: if we have NSYMS symbols we say
2912 that the hashing table must at least have NSYMS/4 and at most
2914 minsize
= nsyms
/ 4;
2917 best_size
= maxsize
= nsyms
* 2;
2919 /* Create array where we count the collisions in. We must use bfd_malloc
2920 since the size could be large. */
2922 amt
*= sizeof (unsigned long int);
2923 counts
= (unsigned long int *) bfd_malloc (amt
);
2930 /* Compute the "optimal" size for the hash table. The criteria is a
2931 minimal chain length. The minor criteria is (of course) the size
2933 for (i
= minsize
; i
< maxsize
; ++i
)
2935 /* Walk through the array of hashcodes and count the collisions. */
2936 BFD_HOST_U_64_BIT max
;
2937 unsigned long int j
;
2938 unsigned long int fact
;
2940 memset (counts
, '\0', i
* sizeof (unsigned long int));
2942 /* Determine how often each hash bucket is used. */
2943 for (j
= 0; j
< nsyms
; ++j
)
2944 ++counts
[hashcodes
[j
] % i
];
2946 /* For the weight function we need some information about the
2947 pagesize on the target. This is information need not be 100%
2948 accurate. Since this information is not available (so far) we
2949 define it here to a reasonable default value. If it is crucial
2950 to have a better value some day simply define this value. */
2951 # ifndef BFD_TARGET_PAGESIZE
2952 # define BFD_TARGET_PAGESIZE (4096)
2955 /* We in any case need 2 + NSYMS entries for the size values and
2957 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2960 /* Variant 1: optimize for short chains. We add the squares
2961 of all the chain lengths (which favous many small chain
2962 over a few long chains). */
2963 for (j
= 0; j
< i
; ++j
)
2964 max
+= counts
[j
] * counts
[j
];
2966 /* This adds penalties for the overall size of the table. */
2967 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2970 /* Variant 2: Optimize a lot more for small table. Here we
2971 also add squares of the size but we also add penalties for
2972 empty slots (the +1 term). */
2973 for (j
= 0; j
< i
; ++j
)
2974 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2976 /* The overall size of the table is considered, but not as
2977 strong as in variant 1, where it is squared. */
2978 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2982 /* Compare with current best results. */
2983 if (max
< best_chlen
)
2993 #endif /* defined (BFD_HOST_U_64_BIT) */
2995 /* This is the fallback solution if no 64bit type is available or if we
2996 are not supposed to spend much time on optimizations. We select the
2997 bucket count using a fixed set of numbers. */
2998 for (i
= 0; elf_buckets
[i
] != 0; i
++)
3000 best_size
= elf_buckets
[i
];
3001 if (dynsymcount
< elf_buckets
[i
+ 1])
3006 /* Free the arrays we needed. */
3012 /* Set up the sizes and contents of the ELF dynamic sections. This is
3013 called by the ELF linker emulation before_allocation routine. We
3014 must set the sizes of the sections before the linker sets the
3015 addresses of the various sections. */
3018 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
3020 auxiliary_filters
, info
, sinterpptr
,
3025 const char *filter_shlib
;
3026 const char * const *auxiliary_filters
;
3027 struct bfd_link_info
*info
;
3028 asection
**sinterpptr
;
3029 struct bfd_elf_version_tree
*verdefs
;
3031 bfd_size_type soname_indx
;
3033 struct elf_backend_data
*bed
;
3034 struct elf_assign_sym_version_info asvinfo
;
3038 soname_indx
= (bfd_size_type
) -1;
3040 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
3043 if (! is_elf_hash_table (info
))
3046 /* Any syms created from now on start with -1 in
3047 got.refcount/offset and plt.refcount/offset. */
3048 elf_hash_table (info
)->init_refcount
= -1;
3050 /* The backend may have to create some sections regardless of whether
3051 we're dynamic or not. */
3052 bed
= get_elf_backend_data (output_bfd
);
3053 if (bed
->elf_backend_always_size_sections
3054 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
3057 dynobj
= elf_hash_table (info
)->dynobj
;
3059 /* If there were no dynamic objects in the link, there is nothing to
3064 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
3067 if (elf_hash_table (info
)->dynamic_sections_created
)
3069 struct elf_info_failed eif
;
3070 struct elf_link_hash_entry
*h
;
3073 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
3074 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
3078 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3080 if (soname_indx
== (bfd_size_type
) -1
3081 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SONAME
,
3088 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMBOLIC
,
3091 info
->flags
|= DF_SYMBOLIC
;
3098 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
3100 if (info
->new_dtags
)
3101 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
3102 if (indx
== (bfd_size_type
) -1
3103 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RPATH
, indx
)
3105 && ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RUNPATH
,
3110 if (filter_shlib
!= NULL
)
3114 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3115 filter_shlib
, true);
3116 if (indx
== (bfd_size_type
) -1
3117 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FILTER
, indx
))
3121 if (auxiliary_filters
!= NULL
)
3123 const char * const *p
;
3125 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
3129 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3131 if (indx
== (bfd_size_type
) -1
3132 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_AUXILIARY
,
3139 eif
.verdefs
= verdefs
;
3142 /* If we are supposed to export all symbols into the dynamic symbol
3143 table (this is not the normal case), then do so. */
3144 if (info
->export_dynamic
)
3146 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
3152 /* Attach all the symbols to their version information. */
3153 asvinfo
.output_bfd
= output_bfd
;
3154 asvinfo
.info
= info
;
3155 asvinfo
.verdefs
= verdefs
;
3156 asvinfo
.failed
= false;
3158 elf_link_hash_traverse (elf_hash_table (info
),
3159 elf_link_assign_sym_version
,
3164 /* Find all symbols which were defined in a dynamic object and make
3165 the backend pick a reasonable value for them. */
3166 elf_link_hash_traverse (elf_hash_table (info
),
3167 elf_adjust_dynamic_symbol
,
3172 /* Add some entries to the .dynamic section. We fill in some of the
3173 values later, in elf_bfd_final_link, but we must add the entries
3174 now so that we know the final size of the .dynamic section. */
3176 /* If there are initialization and/or finalization functions to
3177 call then add the corresponding DT_INIT/DT_FINI entries. */
3178 h
= (info
->init_function
3179 ? elf_link_hash_lookup (elf_hash_table (info
),
3180 info
->init_function
, false,
3184 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3185 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3187 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT
, (bfd_vma
) 0))
3190 h
= (info
->fini_function
3191 ? elf_link_hash_lookup (elf_hash_table (info
),
3192 info
->fini_function
, false,
3196 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3197 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3199 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI
, (bfd_vma
) 0))
3203 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
3205 /* DT_PREINIT_ARRAY is not allowed in shared library. */
3211 for (sub
= info
->input_bfds
; sub
!= NULL
;
3212 sub
= sub
->link_next
)
3213 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
3214 if (elf_section_data (o
)->this_hdr
.sh_type
3215 == SHT_PREINIT_ARRAY
)
3217 (*_bfd_error_handler
)
3218 (_("%s: .preinit_array section is not allowed in DSO"),
3219 bfd_archive_filename (sub
));
3223 bfd_set_error (bfd_error_nonrepresentable_section
);
3227 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAY
,
3229 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAYSZ
,
3233 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
3235 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAY
,
3237 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAYSZ
,
3241 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
3243 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAY
,
3245 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAYSZ
,
3250 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
3251 /* If .dynstr is excluded from the link, we don't want any of
3252 these tags. Strictly, we should be checking each section
3253 individually; This quick check covers for the case where
3254 someone does a /DISCARD/ : { *(*) }. */
3255 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
3257 bfd_size_type strsize
;
3259 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3260 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_HASH
, (bfd_vma
) 0)
3261 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRTAB
, (bfd_vma
) 0)
3262 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMTAB
, (bfd_vma
) 0)
3263 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRSZ
, strsize
)
3264 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMENT
,
3265 (bfd_vma
) sizeof (Elf_External_Sym
)))
3270 /* The backend must work out the sizes of all the other dynamic
3272 if (bed
->elf_backend_size_dynamic_sections
3273 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
3276 if (elf_hash_table (info
)->dynamic_sections_created
)
3278 bfd_size_type dynsymcount
;
3280 size_t bucketcount
= 0;
3281 size_t hash_entry_size
;
3282 unsigned int dtagcount
;
3284 /* Set up the version definition section. */
3285 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3286 BFD_ASSERT (s
!= NULL
);
3288 /* We may have created additional version definitions if we are
3289 just linking a regular application. */
3290 verdefs
= asvinfo
.verdefs
;
3292 /* Skip anonymous version tag. */
3293 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
3294 verdefs
= verdefs
->next
;
3296 if (verdefs
== NULL
)
3297 _bfd_strip_section_from_output (info
, s
);
3302 struct bfd_elf_version_tree
*t
;
3304 Elf_Internal_Verdef def
;
3305 Elf_Internal_Verdaux defaux
;
3310 /* Make space for the base version. */
3311 size
+= sizeof (Elf_External_Verdef
);
3312 size
+= sizeof (Elf_External_Verdaux
);
3315 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3317 struct bfd_elf_version_deps
*n
;
3319 size
+= sizeof (Elf_External_Verdef
);
3320 size
+= sizeof (Elf_External_Verdaux
);
3323 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3324 size
+= sizeof (Elf_External_Verdaux
);
3327 s
->_raw_size
= size
;
3328 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3329 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3332 /* Fill in the version definition section. */
3336 def
.vd_version
= VER_DEF_CURRENT
;
3337 def
.vd_flags
= VER_FLG_BASE
;
3340 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3341 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3342 + sizeof (Elf_External_Verdaux
));
3344 if (soname_indx
!= (bfd_size_type
) -1)
3346 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3348 def
.vd_hash
= bfd_elf_hash (soname
);
3349 defaux
.vda_name
= soname_indx
;
3356 name
= basename (output_bfd
->filename
);
3357 def
.vd_hash
= bfd_elf_hash (name
);
3358 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3360 if (indx
== (bfd_size_type
) -1)
3362 defaux
.vda_name
= indx
;
3364 defaux
.vda_next
= 0;
3366 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3367 (Elf_External_Verdef
*) p
);
3368 p
+= sizeof (Elf_External_Verdef
);
3369 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3370 (Elf_External_Verdaux
*) p
);
3371 p
+= sizeof (Elf_External_Verdaux
);
3373 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3376 struct bfd_elf_version_deps
*n
;
3377 struct elf_link_hash_entry
*h
;
3380 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3383 /* Add a symbol representing this version. */
3385 if (! (_bfd_generic_link_add_one_symbol
3386 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3387 (bfd_vma
) 0, (const char *) NULL
, false,
3388 get_elf_backend_data (dynobj
)->collect
,
3389 (struct bfd_link_hash_entry
**) &h
)))
3391 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3392 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3393 h
->type
= STT_OBJECT
;
3394 h
->verinfo
.vertree
= t
;
3396 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3399 def
.vd_version
= VER_DEF_CURRENT
;
3401 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3402 def
.vd_flags
|= VER_FLG_WEAK
;
3403 def
.vd_ndx
= t
->vernum
+ 1;
3404 def
.vd_cnt
= cdeps
+ 1;
3405 def
.vd_hash
= bfd_elf_hash (t
->name
);
3406 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3407 if (t
->next
!= NULL
)
3408 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3409 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3413 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3414 (Elf_External_Verdef
*) p
);
3415 p
+= sizeof (Elf_External_Verdef
);
3417 defaux
.vda_name
= h
->dynstr_index
;
3418 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3420 if (t
->deps
== NULL
)
3421 defaux
.vda_next
= 0;
3423 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3424 t
->name_indx
= defaux
.vda_name
;
3426 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3427 (Elf_External_Verdaux
*) p
);
3428 p
+= sizeof (Elf_External_Verdaux
);
3430 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3432 if (n
->version_needed
== NULL
)
3434 /* This can happen if there was an error in the
3436 defaux
.vda_name
= 0;
3440 defaux
.vda_name
= n
->version_needed
->name_indx
;
3441 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3444 if (n
->next
== NULL
)
3445 defaux
.vda_next
= 0;
3447 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3449 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3450 (Elf_External_Verdaux
*) p
);
3451 p
+= sizeof (Elf_External_Verdaux
);
3455 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEF
, (bfd_vma
) 0)
3456 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEFNUM
,
3460 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3463 if (info
->new_dtags
&& info
->flags
)
3465 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS
, info
->flags
))
3472 info
->flags_1
&= ~ (DF_1_INITFIRST
3475 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS_1
,
3480 /* Work out the size of the version reference section. */
3482 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3483 BFD_ASSERT (s
!= NULL
);
3485 struct elf_find_verdep_info sinfo
;
3487 sinfo
.output_bfd
= output_bfd
;
3489 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3490 if (sinfo
.vers
== 0)
3492 sinfo
.failed
= false;
3494 elf_link_hash_traverse (elf_hash_table (info
),
3495 elf_link_find_version_dependencies
,
3498 if (elf_tdata (output_bfd
)->verref
== NULL
)
3499 _bfd_strip_section_from_output (info
, s
);
3502 Elf_Internal_Verneed
*t
;
3507 /* Build the version definition section. */
3510 for (t
= elf_tdata (output_bfd
)->verref
;
3514 Elf_Internal_Vernaux
*a
;
3516 size
+= sizeof (Elf_External_Verneed
);
3518 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3519 size
+= sizeof (Elf_External_Vernaux
);
3522 s
->_raw_size
= size
;
3523 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3524 if (s
->contents
== NULL
)
3528 for (t
= elf_tdata (output_bfd
)->verref
;
3533 Elf_Internal_Vernaux
*a
;
3537 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3540 t
->vn_version
= VER_NEED_CURRENT
;
3542 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3543 elf_dt_name (t
->vn_bfd
) != NULL
3544 ? elf_dt_name (t
->vn_bfd
)
3545 : basename (t
->vn_bfd
->filename
),
3547 if (indx
== (bfd_size_type
) -1)
3550 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3551 if (t
->vn_nextref
== NULL
)
3554 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3555 + caux
* sizeof (Elf_External_Vernaux
));
3557 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3558 (Elf_External_Verneed
*) p
);
3559 p
+= sizeof (Elf_External_Verneed
);
3561 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3563 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3564 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3565 a
->vna_nodename
, false);
3566 if (indx
== (bfd_size_type
) -1)
3569 if (a
->vna_nextptr
== NULL
)
3572 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3574 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3575 (Elf_External_Vernaux
*) p
);
3576 p
+= sizeof (Elf_External_Vernaux
);
3580 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEED
,
3582 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEEDNUM
,
3586 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3590 /* Assign dynsym indicies. In a shared library we generate a
3591 section symbol for each output section, which come first.
3592 Next come all of the back-end allocated local dynamic syms,
3593 followed by the rest of the global symbols. */
3595 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3597 /* Work out the size of the symbol version section. */
3598 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3599 BFD_ASSERT (s
!= NULL
);
3600 if (dynsymcount
== 0
3601 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3603 _bfd_strip_section_from_output (info
, s
);
3604 /* The DYNSYMCOUNT might have changed if we were going to
3605 output a dynamic symbol table entry for S. */
3606 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3610 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3611 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3612 if (s
->contents
== NULL
)
3615 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERSYM
, (bfd_vma
) 0))
3619 /* Set the size of the .dynsym and .hash sections. We counted
3620 the number of dynamic symbols in elf_link_add_object_symbols.
3621 We will build the contents of .dynsym and .hash when we build
3622 the final symbol table, because until then we do not know the
3623 correct value to give the symbols. We built the .dynstr
3624 section as we went along in elf_link_add_object_symbols. */
3625 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3626 BFD_ASSERT (s
!= NULL
);
3627 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3628 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3629 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3632 if (dynsymcount
!= 0)
3634 Elf_Internal_Sym isym
;
3636 /* The first entry in .dynsym is a dummy symbol. */
3643 elf_swap_symbol_out (output_bfd
, &isym
, (PTR
) s
->contents
, (PTR
) 0);
3646 /* Compute the size of the hashing table. As a side effect this
3647 computes the hash values for all the names we export. */
3648 bucketcount
= compute_bucket_count (info
);
3650 s
= bfd_get_section_by_name (dynobj
, ".hash");
3651 BFD_ASSERT (s
!= NULL
);
3652 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3653 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3654 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3655 if (s
->contents
== NULL
)
3657 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3659 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) bucketcount
,
3661 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) dynsymcount
,
3662 s
->contents
+ hash_entry_size
);
3664 elf_hash_table (info
)->bucketcount
= bucketcount
;
3666 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3667 BFD_ASSERT (s
!= NULL
);
3669 elf_finalize_dynstr (output_bfd
, info
);
3671 s
->_raw_size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3673 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
3674 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NULL
, (bfd_vma
) 0))
3681 /* This function is used to adjust offsets into .dynstr for
3682 dynamic symbols. This is called via elf_link_hash_traverse. */
3684 static boolean elf_adjust_dynstr_offsets
3685 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3688 elf_adjust_dynstr_offsets (h
, data
)
3689 struct elf_link_hash_entry
*h
;
3692 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3694 if (h
->dynindx
!= -1)
3695 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3699 /* Assign string offsets in .dynstr, update all structures referencing
3703 elf_finalize_dynstr (output_bfd
, info
)
3705 struct bfd_link_info
*info
;
3707 struct elf_link_local_dynamic_entry
*entry
;
3708 struct elf_strtab_hash
*dynstr
= elf_hash_table (info
)->dynstr
;
3709 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
3712 Elf_External_Dyn
*dyncon
, *dynconend
;
3714 _bfd_elf_strtab_finalize (dynstr
);
3715 size
= _bfd_elf_strtab_size (dynstr
);
3717 /* Update all .dynamic entries referencing .dynstr strings. */
3718 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3719 BFD_ASSERT (sdyn
!= NULL
);
3721 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
3722 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
3724 for (; dyncon
< dynconend
; dyncon
++)
3726 Elf_Internal_Dyn dyn
;
3728 elf_swap_dyn_in (dynobj
, dyncon
, & dyn
);
3732 dyn
.d_un
.d_val
= size
;
3733 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3741 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3742 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3749 /* Now update local dynamic symbols. */
3750 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
3751 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3752 entry
->isym
.st_name
);
3754 /* And the rest of dynamic symbols. */
3755 elf_link_hash_traverse (elf_hash_table (info
),
3756 elf_adjust_dynstr_offsets
, dynstr
);
3758 /* Adjust version definitions. */
3759 if (elf_tdata (output_bfd
)->cverdefs
)
3764 Elf_Internal_Verdef def
;
3765 Elf_Internal_Verdaux defaux
;
3767 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3768 p
= (bfd_byte
*) s
->contents
;
3771 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3773 p
+= sizeof (Elf_External_Verdef
);
3774 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3776 _bfd_elf_swap_verdaux_in (output_bfd
,
3777 (Elf_External_Verdaux
*) p
, &defaux
);
3778 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3780 _bfd_elf_swap_verdaux_out (output_bfd
,
3781 &defaux
, (Elf_External_Verdaux
*) p
);
3782 p
+= sizeof (Elf_External_Verdaux
);
3785 while (def
.vd_next
);
3788 /* Adjust version references. */
3789 if (elf_tdata (output_bfd
)->verref
)
3794 Elf_Internal_Verneed need
;
3795 Elf_Internal_Vernaux needaux
;
3797 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3798 p
= (bfd_byte
*) s
->contents
;
3801 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3803 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3804 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3805 (Elf_External_Verneed
*) p
);
3806 p
+= sizeof (Elf_External_Verneed
);
3807 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3809 _bfd_elf_swap_vernaux_in (output_bfd
,
3810 (Elf_External_Vernaux
*) p
, &needaux
);
3811 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3813 _bfd_elf_swap_vernaux_out (output_bfd
,
3815 (Elf_External_Vernaux
*) p
);
3816 p
+= sizeof (Elf_External_Vernaux
);
3819 while (need
.vn_next
);
3825 /* Fix up the flags for a symbol. This handles various cases which
3826 can only be fixed after all the input files are seen. This is
3827 currently called by both adjust_dynamic_symbol and
3828 assign_sym_version, which is unnecessary but perhaps more robust in
3829 the face of future changes. */
3832 elf_fix_symbol_flags (h
, eif
)
3833 struct elf_link_hash_entry
*h
;
3834 struct elf_info_failed
*eif
;
3836 /* If this symbol was mentioned in a non-ELF file, try to set
3837 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3838 permit a non-ELF file to correctly refer to a symbol defined in
3839 an ELF dynamic object. */
3840 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3842 while (h
->root
.type
== bfd_link_hash_indirect
)
3843 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3845 if (h
->root
.type
!= bfd_link_hash_defined
3846 && h
->root
.type
!= bfd_link_hash_defweak
)
3847 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3848 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3851 if (h
->root
.u
.def
.section
->owner
!= NULL
3852 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3853 == bfd_target_elf_flavour
))
3854 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3855 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3857 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3860 if (h
->dynindx
== -1
3861 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3862 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3864 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3873 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3874 was first seen in a non-ELF file. Fortunately, if the symbol
3875 was first seen in an ELF file, we're probably OK unless the
3876 symbol was defined in a non-ELF file. Catch that case here.
3877 FIXME: We're still in trouble if the symbol was first seen in
3878 a dynamic object, and then later in a non-ELF regular object. */
3879 if ((h
->root
.type
== bfd_link_hash_defined
3880 || h
->root
.type
== bfd_link_hash_defweak
)
3881 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3882 && (h
->root
.u
.def
.section
->owner
!= NULL
3883 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3884 != bfd_target_elf_flavour
)
3885 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3886 && (h
->elf_link_hash_flags
3887 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3888 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3891 /* If this is a final link, and the symbol was defined as a common
3892 symbol in a regular object file, and there was no definition in
3893 any dynamic object, then the linker will have allocated space for
3894 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3895 flag will not have been set. */
3896 if (h
->root
.type
== bfd_link_hash_defined
3897 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3898 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3899 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3900 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3901 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3903 /* If -Bsymbolic was used (which means to bind references to global
3904 symbols to the definition within the shared object), and this
3905 symbol was defined in a regular object, then it actually doesn't
3906 need a PLT entry, and we can accomplish that by forcing it local.
3907 Likewise, if the symbol has hidden or internal visibility.
3908 FIXME: It might be that we also do not need a PLT for other
3909 non-hidden visibilities, but we would have to tell that to the
3910 backend specifically; we can't just clear PLT-related data here. */
3911 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3912 && eif
->info
->shared
3913 && is_elf_hash_table (eif
->info
)
3914 && (eif
->info
->symbolic
3915 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3916 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
3917 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3919 struct elf_backend_data
*bed
;
3920 boolean force_local
;
3922 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3924 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3925 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
3926 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
3929 /* If this is a weak defined symbol in a dynamic object, and we know
3930 the real definition in the dynamic object, copy interesting flags
3931 over to the real definition. */
3932 if (h
->weakdef
!= NULL
)
3934 struct elf_link_hash_entry
*weakdef
;
3936 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3937 || h
->root
.type
== bfd_link_hash_defweak
);
3938 weakdef
= h
->weakdef
;
3939 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3940 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3941 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3943 /* If the real definition is defined by a regular object file,
3944 don't do anything special. See the longer description in
3945 elf_adjust_dynamic_symbol, below. */
3946 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3950 struct elf_backend_data
*bed
;
3952 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3953 (*bed
->elf_backend_copy_indirect_symbol
) (weakdef
, h
);
3960 /* Make the backend pick a good value for a dynamic symbol. This is
3961 called via elf_link_hash_traverse, and also calls itself
3965 elf_adjust_dynamic_symbol (h
, data
)
3966 struct elf_link_hash_entry
*h
;
3969 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3971 struct elf_backend_data
*bed
;
3973 /* Ignore indirect symbols. These are added by the versioning code. */
3974 if (h
->root
.type
== bfd_link_hash_indirect
)
3977 if (! is_elf_hash_table (eif
->info
))
3980 /* Fix the symbol flags. */
3981 if (! elf_fix_symbol_flags (h
, eif
))
3984 /* If this symbol does not require a PLT entry, and it is not
3985 defined by a dynamic object, or is not referenced by a regular
3986 object, ignore it. We do have to handle a weak defined symbol,
3987 even if no regular object refers to it, if we decided to add it
3988 to the dynamic symbol table. FIXME: Do we normally need to worry
3989 about symbols which are defined by one dynamic object and
3990 referenced by another one? */
3991 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3992 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3993 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3994 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3995 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3997 h
->plt
.offset
= (bfd_vma
) -1;
4001 /* If we've already adjusted this symbol, don't do it again. This
4002 can happen via a recursive call. */
4003 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
4006 /* Don't look at this symbol again. Note that we must set this
4007 after checking the above conditions, because we may look at a
4008 symbol once, decide not to do anything, and then get called
4009 recursively later after REF_REGULAR is set below. */
4010 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
4012 /* If this is a weak definition, and we know a real definition, and
4013 the real symbol is not itself defined by a regular object file,
4014 then get a good value for the real definition. We handle the
4015 real symbol first, for the convenience of the backend routine.
4017 Note that there is a confusing case here. If the real definition
4018 is defined by a regular object file, we don't get the real symbol
4019 from the dynamic object, but we do get the weak symbol. If the
4020 processor backend uses a COPY reloc, then if some routine in the
4021 dynamic object changes the real symbol, we will not see that
4022 change in the corresponding weak symbol. This is the way other
4023 ELF linkers work as well, and seems to be a result of the shared
4026 I will clarify this issue. Most SVR4 shared libraries define the
4027 variable _timezone and define timezone as a weak synonym. The
4028 tzset call changes _timezone. If you write
4029 extern int timezone;
4031 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
4032 you might expect that, since timezone is a synonym for _timezone,
4033 the same number will print both times. However, if the processor
4034 backend uses a COPY reloc, then actually timezone will be copied
4035 into your process image, and, since you define _timezone
4036 yourself, _timezone will not. Thus timezone and _timezone will
4037 wind up at different memory locations. The tzset call will set
4038 _timezone, leaving timezone unchanged. */
4040 if (h
->weakdef
!= NULL
)
4042 /* If we get to this point, we know there is an implicit
4043 reference by a regular object file via the weak symbol H.
4044 FIXME: Is this really true? What if the traversal finds
4045 H->WEAKDEF before it finds H? */
4046 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
4048 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
4052 /* If a symbol has no type and no size and does not require a PLT
4053 entry, then we are probably about to do the wrong thing here: we
4054 are probably going to create a COPY reloc for an empty object.
4055 This case can arise when a shared object is built with assembly
4056 code, and the assembly code fails to set the symbol type. */
4058 && h
->type
== STT_NOTYPE
4059 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
4060 (*_bfd_error_handler
)
4061 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4062 h
->root
.root
.string
);
4064 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
4065 bed
= get_elf_backend_data (dynobj
);
4066 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
4075 /* This routine is used to export all defined symbols into the dynamic
4076 symbol table. It is called via elf_link_hash_traverse. */
4079 elf_export_symbol (h
, data
)
4080 struct elf_link_hash_entry
*h
;
4083 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
4085 /* Ignore indirect symbols. These are added by the versioning code. */
4086 if (h
->root
.type
== bfd_link_hash_indirect
)
4089 if (h
->dynindx
== -1
4090 && (h
->elf_link_hash_flags
4091 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
4093 struct bfd_elf_version_tree
*t
;
4094 struct bfd_elf_version_expr
*d
;
4096 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
4098 if (t
->globals
!= NULL
)
4100 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4102 if ((*d
->match
) (d
, h
->root
.root
.string
))
4107 if (t
->locals
!= NULL
)
4109 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4111 if ((*d
->match
) (d
, h
->root
.root
.string
))
4120 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
4131 /* Look through the symbols which are defined in other shared
4132 libraries and referenced here. Update the list of version
4133 dependencies. This will be put into the .gnu.version_r section.
4134 This function is called via elf_link_hash_traverse. */
4137 elf_link_find_version_dependencies (h
, data
)
4138 struct elf_link_hash_entry
*h
;
4141 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
4142 Elf_Internal_Verneed
*t
;
4143 Elf_Internal_Vernaux
*a
;
4146 /* We only care about symbols defined in shared objects with version
4148 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
4149 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
4151 || h
->verinfo
.verdef
== NULL
)
4154 /* See if we already know about this version. */
4155 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
4157 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
4160 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4161 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
4167 /* This is a new version. Add it to tree we are building. */
4172 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4175 rinfo
->failed
= true;
4179 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
4180 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
4181 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
4185 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4187 /* Note that we are copying a string pointer here, and testing it
4188 above. If bfd_elf_string_from_elf_section is ever changed to
4189 discard the string data when low in memory, this will have to be
4191 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
4193 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
4194 a
->vna_nextptr
= t
->vn_auxptr
;
4196 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
4199 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4206 /* Figure out appropriate versions for all the symbols. We may not
4207 have the version number script until we have read all of the input
4208 files, so until that point we don't know which symbols should be
4209 local. This function is called via elf_link_hash_traverse. */
4212 elf_link_assign_sym_version (h
, data
)
4213 struct elf_link_hash_entry
*h
;
4216 struct elf_assign_sym_version_info
*sinfo
;
4217 struct bfd_link_info
*info
;
4218 struct elf_backend_data
*bed
;
4219 struct elf_info_failed eif
;
4223 sinfo
= (struct elf_assign_sym_version_info
*) data
;
4226 /* Fix the symbol flags. */
4229 if (! elf_fix_symbol_flags (h
, &eif
))
4232 sinfo
->failed
= true;
4236 /* We only need version numbers for symbols defined in regular
4238 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4241 bed
= get_elf_backend_data (sinfo
->output_bfd
);
4242 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4243 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4245 struct bfd_elf_version_tree
*t
;
4250 /* There are two consecutive ELF_VER_CHR characters if this is
4251 not a hidden symbol. */
4253 if (*p
== ELF_VER_CHR
)
4259 /* If there is no version string, we can just return out. */
4263 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4267 /* Look for the version. If we find it, it is no longer weak. */
4268 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4270 if (strcmp (t
->name
, p
) == 0)
4274 struct bfd_elf_version_expr
*d
;
4276 len
= p
- h
->root
.root
.string
;
4277 alc
= bfd_malloc ((bfd_size_type
) len
);
4280 strncpy (alc
, h
->root
.root
.string
, len
- 1);
4281 alc
[len
- 1] = '\0';
4282 if (alc
[len
- 2] == ELF_VER_CHR
)
4283 alc
[len
- 2] = '\0';
4285 h
->verinfo
.vertree
= t
;
4289 if (t
->globals
!= NULL
)
4291 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4292 if ((*d
->match
) (d
, alc
))
4296 /* See if there is anything to force this symbol to
4298 if (d
== NULL
&& t
->locals
!= NULL
)
4300 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4302 if ((*d
->match
) (d
, alc
))
4304 if (h
->dynindx
!= -1
4306 && ! info
->export_dynamic
)
4308 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4321 /* If we are building an application, we need to create a
4322 version node for this version. */
4323 if (t
== NULL
&& ! info
->shared
)
4325 struct bfd_elf_version_tree
**pp
;
4328 /* If we aren't going to export this symbol, we don't need
4329 to worry about it. */
4330 if (h
->dynindx
== -1)
4334 t
= ((struct bfd_elf_version_tree
*)
4335 bfd_alloc (sinfo
->output_bfd
, amt
));
4338 sinfo
->failed
= true;
4347 t
->name_indx
= (unsigned int) -1;
4351 /* Don't count anonymous version tag. */
4352 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
4354 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
4356 t
->vernum
= version_index
;
4360 h
->verinfo
.vertree
= t
;
4364 /* We could not find the version for a symbol when
4365 generating a shared archive. Return an error. */
4366 (*_bfd_error_handler
)
4367 (_("%s: undefined versioned symbol name %s"),
4368 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
4369 bfd_set_error (bfd_error_bad_value
);
4370 sinfo
->failed
= true;
4375 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4378 /* If we don't have a version for this symbol, see if we can find
4380 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
4382 struct bfd_elf_version_tree
*t
;
4383 struct bfd_elf_version_tree
*deflt
;
4384 struct bfd_elf_version_expr
*d
;
4386 /* See if can find what version this symbol is in. If the
4387 symbol is supposed to be local, then don't actually register
4390 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4392 if (t
->globals
!= NULL
)
4394 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4396 if ((*d
->match
) (d
, h
->root
.root
.string
))
4398 h
->verinfo
.vertree
= t
;
4407 if (t
->locals
!= NULL
)
4409 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4411 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
4413 else if ((*d
->match
) (d
, h
->root
.root
.string
))
4415 h
->verinfo
.vertree
= t
;
4416 if (h
->dynindx
!= -1
4418 && ! info
->export_dynamic
)
4420 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4431 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4433 h
->verinfo
.vertree
= deflt
;
4434 if (h
->dynindx
!= -1
4436 && ! info
->export_dynamic
)
4438 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4446 /* Final phase of ELF linker. */
4448 /* A structure we use to avoid passing large numbers of arguments. */
4450 struct elf_final_link_info
4452 /* General link information. */
4453 struct bfd_link_info
*info
;
4456 /* Symbol string table. */
4457 struct bfd_strtab_hash
*symstrtab
;
4458 /* .dynsym section. */
4459 asection
*dynsym_sec
;
4460 /* .hash section. */
4462 /* symbol version section (.gnu.version). */
4463 asection
*symver_sec
;
4464 /* Buffer large enough to hold contents of any section. */
4466 /* Buffer large enough to hold external relocs of any section. */
4467 PTR external_relocs
;
4468 /* Buffer large enough to hold internal relocs of any section. */
4469 Elf_Internal_Rela
*internal_relocs
;
4470 /* Buffer large enough to hold external local symbols of any input
4472 Elf_External_Sym
*external_syms
;
4473 /* And a buffer for symbol section indices. */
4474 Elf_External_Sym_Shndx
*locsym_shndx
;
4475 /* Buffer large enough to hold internal local symbols of any input
4477 Elf_Internal_Sym
*internal_syms
;
4478 /* Array large enough to hold a symbol index for each local symbol
4479 of any input BFD. */
4481 /* Array large enough to hold a section pointer for each local
4482 symbol of any input BFD. */
4483 asection
**sections
;
4484 /* Buffer to hold swapped out symbols. */
4485 Elf_External_Sym
*symbuf
;
4486 /* And one for symbol section indices. */
4487 Elf_External_Sym_Shndx
*symshndxbuf
;
4488 /* Number of swapped out symbols in buffer. */
4489 size_t symbuf_count
;
4490 /* Number of symbols which fit in symbuf. */
4494 static boolean elf_link_output_sym
4495 PARAMS ((struct elf_final_link_info
*, const char *,
4496 Elf_Internal_Sym
*, asection
*));
4497 static boolean elf_link_flush_output_syms
4498 PARAMS ((struct elf_final_link_info
*));
4499 static boolean elf_link_output_extsym
4500 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4501 static boolean elf_link_sec_merge_syms
4502 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4503 static boolean elf_link_input_bfd
4504 PARAMS ((struct elf_final_link_info
*, bfd
*));
4505 static boolean elf_reloc_link_order
4506 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
4507 struct bfd_link_order
*));
4509 /* This struct is used to pass information to elf_link_output_extsym. */
4511 struct elf_outext_info
4515 struct elf_final_link_info
*finfo
;
4518 /* Compute the size of, and allocate space for, REL_HDR which is the
4519 section header for a section containing relocations for O. */
4522 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4524 Elf_Internal_Shdr
*rel_hdr
;
4527 bfd_size_type reloc_count
;
4528 bfd_size_type num_rel_hashes
;
4530 /* Figure out how many relocations there will be. */
4531 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4532 reloc_count
= elf_section_data (o
)->rel_count
;
4534 reloc_count
= elf_section_data (o
)->rel_count2
;
4536 num_rel_hashes
= o
->reloc_count
;
4537 if (num_rel_hashes
< reloc_count
)
4538 num_rel_hashes
= reloc_count
;
4540 /* That allows us to calculate the size of the section. */
4541 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4543 /* The contents field must last into write_object_contents, so we
4544 allocate it with bfd_alloc rather than malloc. Also since we
4545 cannot be sure that the contents will actually be filled in,
4546 we zero the allocated space. */
4547 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4548 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4551 /* We only allocate one set of hash entries, so we only do it the
4552 first time we are called. */
4553 if (elf_section_data (o
)->rel_hashes
== NULL
4556 struct elf_link_hash_entry
**p
;
4558 p
= ((struct elf_link_hash_entry
**)
4559 bfd_zmalloc (num_rel_hashes
4560 * sizeof (struct elf_link_hash_entry
*)));
4564 elf_section_data (o
)->rel_hashes
= p
;
4570 /* When performing a relocateable link, the input relocations are
4571 preserved. But, if they reference global symbols, the indices
4572 referenced must be updated. Update all the relocations in
4573 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4576 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4578 Elf_Internal_Shdr
*rel_hdr
;
4580 struct elf_link_hash_entry
**rel_hash
;
4583 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4584 Elf_Internal_Rel
*irel
;
4585 Elf_Internal_Rela
*irela
;
4586 bfd_size_type amt
= sizeof (Elf_Internal_Rel
) * bed
->s
->int_rels_per_ext_rel
;
4588 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
4591 (*_bfd_error_handler
) (_("Error: out of memory"));
4595 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
4596 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
4599 (*_bfd_error_handler
) (_("Error: out of memory"));
4603 for (i
= 0; i
< count
; i
++, rel_hash
++)
4605 if (*rel_hash
== NULL
)
4608 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4610 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4612 Elf_External_Rel
*erel
;
4615 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4616 if (bed
->s
->swap_reloc_in
)
4617 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
4619 elf_swap_reloc_in (abfd
, erel
, irel
);
4621 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4622 irel
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4623 ELF_R_TYPE (irel
[j
].r_info
));
4625 if (bed
->s
->swap_reloc_out
)
4626 (*bed
->s
->swap_reloc_out
) (abfd
, irel
, (bfd_byte
*) erel
);
4628 elf_swap_reloc_out (abfd
, irel
, erel
);
4632 Elf_External_Rela
*erela
;
4635 BFD_ASSERT (rel_hdr
->sh_entsize
4636 == sizeof (Elf_External_Rela
));
4638 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4639 if (bed
->s
->swap_reloca_in
)
4640 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
4642 elf_swap_reloca_in (abfd
, erela
, irela
);
4644 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4645 irela
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4646 ELF_R_TYPE (irela
[j
].r_info
));
4648 if (bed
->s
->swap_reloca_out
)
4649 (*bed
->s
->swap_reloca_out
) (abfd
, irela
, (bfd_byte
*) erela
);
4651 elf_swap_reloca_out (abfd
, irela
, erela
);
4659 struct elf_link_sort_rela
{
4661 enum elf_reloc_type_class type
;
4663 Elf_Internal_Rel rel
;
4664 Elf_Internal_Rela rela
;
4669 elf_link_sort_cmp1 (A
, B
)
4673 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4674 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4675 int relativea
, relativeb
;
4677 relativea
= a
->type
== reloc_class_relative
;
4678 relativeb
= b
->type
== reloc_class_relative
;
4680 if (relativea
< relativeb
)
4682 if (relativea
> relativeb
)
4684 if (ELF_R_SYM (a
->u
.rel
.r_info
) < ELF_R_SYM (b
->u
.rel
.r_info
))
4686 if (ELF_R_SYM (a
->u
.rel
.r_info
) > ELF_R_SYM (b
->u
.rel
.r_info
))
4688 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4690 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4696 elf_link_sort_cmp2 (A
, B
)
4700 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4701 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4704 if (a
->offset
< b
->offset
)
4706 if (a
->offset
> b
->offset
)
4708 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
4709 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
4714 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4716 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4722 elf_link_sort_relocs (abfd
, info
, psec
)
4724 struct bfd_link_info
*info
;
4727 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4728 asection
*reldyn
, *o
;
4729 boolean rel
= false;
4730 bfd_size_type count
, size
;
4732 struct elf_link_sort_rela
*rela
;
4733 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4735 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
4736 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4738 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
4739 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4742 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rel
);
4745 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rela
);
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
)
4752 size
+= o
->_raw_size
;
4754 if (size
!= reldyn
->_raw_size
)
4757 rela
= (struct elf_link_sort_rela
*) bfd_zmalloc (sizeof (*rela
) * count
);
4760 (*info
->callbacks
->warning
)
4761 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0,
4766 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4767 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4768 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4769 && o
->output_section
== reldyn
)
4773 Elf_External_Rel
*erel
, *erelend
;
4774 struct elf_link_sort_rela
*s
;
4776 erel
= (Elf_External_Rel
*) o
->contents
;
4777 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4778 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4779 for (; erel
< erelend
; erel
++, s
++)
4781 if (bed
->s
->swap_reloc_in
)
4782 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, &s
->u
.rel
);
4784 elf_swap_reloc_in (abfd
, erel
, &s
->u
.rel
);
4786 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4791 Elf_External_Rela
*erela
, *erelaend
;
4792 struct elf_link_sort_rela
*s
;
4794 erela
= (Elf_External_Rela
*) o
->contents
;
4795 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4796 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4797 for (; erela
< erelaend
; erela
++, s
++)
4799 if (bed
->s
->swap_reloca_in
)
4800 (*bed
->s
->swap_reloca_in
) (dynobj
, (bfd_byte
*) erela
,
4803 elf_swap_reloca_in (dynobj
, erela
, &s
->u
.rela
);
4805 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4810 qsort (rela
, (size_t) count
, sizeof (*rela
), elf_link_sort_cmp1
);
4811 for (ret
= 0; ret
< count
&& rela
[ret
].type
== reloc_class_relative
; ret
++)
4813 for (i
= ret
, j
= ret
; i
< count
; i
++)
4815 if (ELF_R_SYM (rela
[i
].u
.rel
.r_info
) != ELF_R_SYM (rela
[j
].u
.rel
.r_info
))
4817 rela
[i
].offset
= rela
[j
].u
.rel
.r_offset
;
4819 qsort (rela
+ ret
, (size_t) count
- ret
, sizeof (*rela
), elf_link_sort_cmp2
);
4821 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4822 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4823 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4824 && o
->output_section
== reldyn
)
4828 Elf_External_Rel
*erel
, *erelend
;
4829 struct elf_link_sort_rela
*s
;
4831 erel
= (Elf_External_Rel
*) o
->contents
;
4832 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4833 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4834 for (; erel
< erelend
; erel
++, s
++)
4836 if (bed
->s
->swap_reloc_out
)
4837 (*bed
->s
->swap_reloc_out
) (abfd
, &s
->u
.rel
,
4840 elf_swap_reloc_out (abfd
, &s
->u
.rel
, erel
);
4845 Elf_External_Rela
*erela
, *erelaend
;
4846 struct elf_link_sort_rela
*s
;
4848 erela
= (Elf_External_Rela
*) o
->contents
;
4849 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4850 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4851 for (; erela
< erelaend
; erela
++, s
++)
4853 if (bed
->s
->swap_reloca_out
)
4854 (*bed
->s
->swap_reloca_out
) (dynobj
, &s
->u
.rela
,
4855 (bfd_byte
*) erela
);
4857 elf_swap_reloca_out (dynobj
, &s
->u
.rela
, erela
);
4867 /* Do the final step of an ELF link. */
4870 elf_bfd_final_link (abfd
, info
)
4872 struct bfd_link_info
*info
;
4875 boolean emit_relocs
;
4877 struct elf_final_link_info finfo
;
4878 register asection
*o
;
4879 register struct bfd_link_order
*p
;
4881 bfd_size_type max_contents_size
;
4882 bfd_size_type max_external_reloc_size
;
4883 bfd_size_type max_internal_reloc_count
;
4884 bfd_size_type max_sym_count
;
4885 bfd_size_type max_sym_shndx_count
;
4887 Elf_Internal_Sym elfsym
;
4889 Elf_Internal_Shdr
*symtab_hdr
;
4890 Elf_Internal_Shdr
*symstrtab_hdr
;
4891 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4892 struct elf_outext_info eoinfo
;
4894 size_t relativecount
= 0;
4895 asection
*reldyn
= 0;
4898 if (! is_elf_hash_table (info
))
4902 abfd
->flags
|= DYNAMIC
;
4904 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4905 dynobj
= elf_hash_table (info
)->dynobj
;
4907 emit_relocs
= (info
->relocateable
4908 || info
->emitrelocations
4909 || bed
->elf_backend_emit_relocs
);
4912 finfo
.output_bfd
= abfd
;
4913 finfo
.symstrtab
= elf_stringtab_init ();
4914 if (finfo
.symstrtab
== NULL
)
4919 finfo
.dynsym_sec
= NULL
;
4920 finfo
.hash_sec
= NULL
;
4921 finfo
.symver_sec
= NULL
;
4925 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4926 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4927 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4928 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4929 /* Note that it is OK if symver_sec is NULL. */
4932 finfo
.contents
= NULL
;
4933 finfo
.external_relocs
= NULL
;
4934 finfo
.internal_relocs
= NULL
;
4935 finfo
.external_syms
= NULL
;
4936 finfo
.locsym_shndx
= NULL
;
4937 finfo
.internal_syms
= NULL
;
4938 finfo
.indices
= NULL
;
4939 finfo
.sections
= NULL
;
4940 finfo
.symbuf
= NULL
;
4941 finfo
.symshndxbuf
= NULL
;
4942 finfo
.symbuf_count
= 0;
4944 /* Count up the number of relocations we will output for each output
4945 section, so that we know the sizes of the reloc sections. We
4946 also figure out some maximum sizes. */
4947 max_contents_size
= 0;
4948 max_external_reloc_size
= 0;
4949 max_internal_reloc_count
= 0;
4951 max_sym_shndx_count
= 0;
4953 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4957 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4959 if (p
->type
== bfd_section_reloc_link_order
4960 || p
->type
== bfd_symbol_reloc_link_order
)
4962 else if (p
->type
== bfd_indirect_link_order
)
4966 sec
= p
->u
.indirect
.section
;
4968 /* Mark all sections which are to be included in the
4969 link. This will normally be every section. We need
4970 to do this so that we can identify any sections which
4971 the linker has decided to not include. */
4972 sec
->linker_mark
= true;
4974 if (sec
->flags
& SEC_MERGE
)
4977 if (info
->relocateable
|| info
->emitrelocations
)
4978 o
->reloc_count
+= sec
->reloc_count
;
4979 else if (bed
->elf_backend_count_relocs
)
4981 Elf_Internal_Rela
* relocs
;
4983 relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4984 (abfd
, sec
, (PTR
) NULL
,
4985 (Elf_Internal_Rela
*) NULL
, info
->keep_memory
));
4988 += (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
4990 if (!info
->keep_memory
)
4994 if (sec
->_raw_size
> max_contents_size
)
4995 max_contents_size
= sec
->_raw_size
;
4996 if (sec
->_cooked_size
> max_contents_size
)
4997 max_contents_size
= sec
->_cooked_size
;
4999 /* We are interested in just local symbols, not all
5001 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
5002 && (sec
->owner
->flags
& DYNAMIC
) == 0)
5006 if (elf_bad_symtab (sec
->owner
))
5007 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
5008 / sizeof (Elf_External_Sym
));
5010 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
5012 if (sym_count
> max_sym_count
)
5013 max_sym_count
= sym_count
;
5015 if (sym_count
> max_sym_shndx_count
5016 && elf_symtab_shndx (sec
->owner
) != 0)
5017 max_sym_shndx_count
= sym_count
;
5019 if ((sec
->flags
& SEC_RELOC
) != 0)
5023 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
5024 if (ext_size
> max_external_reloc_size
)
5025 max_external_reloc_size
= ext_size
;
5026 if (sec
->reloc_count
> max_internal_reloc_count
)
5027 max_internal_reloc_count
= sec
->reloc_count
;
5033 if (o
->reloc_count
> 0)
5034 o
->flags
|= SEC_RELOC
;
5037 /* Explicitly clear the SEC_RELOC flag. The linker tends to
5038 set it (this is probably a bug) and if it is set
5039 assign_section_numbers will create a reloc section. */
5040 o
->flags
&=~ SEC_RELOC
;
5043 /* If the SEC_ALLOC flag is not set, force the section VMA to
5044 zero. This is done in elf_fake_sections as well, but forcing
5045 the VMA to 0 here will ensure that relocs against these
5046 sections are handled correctly. */
5047 if ((o
->flags
& SEC_ALLOC
) == 0
5048 && ! o
->user_set_vma
)
5052 if (! info
->relocateable
&& merged
)
5053 elf_link_hash_traverse (elf_hash_table (info
),
5054 elf_link_sec_merge_syms
, (PTR
) abfd
);
5056 /* Figure out the file positions for everything but the symbol table
5057 and the relocs. We set symcount to force assign_section_numbers
5058 to create a symbol table. */
5059 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
5060 BFD_ASSERT (! abfd
->output_has_begun
);
5061 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
5064 /* Figure out how many relocations we will have in each section.
5065 Just using RELOC_COUNT isn't good enough since that doesn't
5066 maintain a separate value for REL vs. RELA relocations. */
5068 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5069 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5071 asection
*output_section
;
5073 if (! o
->linker_mark
)
5075 /* This section was omitted from the link. */
5079 output_section
= o
->output_section
;
5081 if (output_section
!= NULL
5082 && (o
->flags
& SEC_RELOC
) != 0)
5084 struct bfd_elf_section_data
*esdi
5085 = elf_section_data (o
);
5086 struct bfd_elf_section_data
*esdo
5087 = elf_section_data (output_section
);
5088 unsigned int *rel_count
;
5089 unsigned int *rel_count2
;
5090 bfd_size_type entsize
;
5091 bfd_size_type entsize2
;
5093 /* We must be careful to add the relocations from the
5094 input section to the right output count. */
5095 entsize
= esdi
->rel_hdr
.sh_entsize
;
5096 entsize2
= esdi
->rel_hdr2
? esdi
->rel_hdr2
->sh_entsize
: 0;
5097 BFD_ASSERT ((entsize
== sizeof (Elf_External_Rel
)
5098 || entsize
== sizeof (Elf_External_Rela
))
5099 && entsize2
!= entsize
5101 || entsize2
== sizeof (Elf_External_Rel
)
5102 || entsize2
== sizeof (Elf_External_Rela
)));
5103 if (entsize
== esdo
->rel_hdr
.sh_entsize
)
5105 rel_count
= &esdo
->rel_count
;
5106 rel_count2
= &esdo
->rel_count2
;
5110 rel_count
= &esdo
->rel_count2
;
5111 rel_count2
= &esdo
->rel_count
;
5114 *rel_count
+= NUM_SHDR_ENTRIES (& esdi
->rel_hdr
);
5116 *rel_count2
+= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
5117 output_section
->flags
|= SEC_RELOC
;
5121 /* That created the reloc sections. Set their sizes, and assign
5122 them file positions, and allocate some buffers. */
5123 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5125 if ((o
->flags
& SEC_RELOC
) != 0)
5127 if (!elf_link_size_reloc_section (abfd
,
5128 &elf_section_data (o
)->rel_hdr
,
5132 if (elf_section_data (o
)->rel_hdr2
5133 && !elf_link_size_reloc_section (abfd
,
5134 elf_section_data (o
)->rel_hdr2
,
5139 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5140 to count upwards while actually outputting the relocations. */
5141 elf_section_data (o
)->rel_count
= 0;
5142 elf_section_data (o
)->rel_count2
= 0;
5145 _bfd_elf_assign_file_positions_for_relocs (abfd
);
5147 /* We have now assigned file positions for all the sections except
5148 .symtab and .strtab. We start the .symtab section at the current
5149 file position, and write directly to it. We build the .strtab
5150 section in memory. */
5151 bfd_get_symcount (abfd
) = 0;
5152 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
5153 /* sh_name is set in prep_headers. */
5154 symtab_hdr
->sh_type
= SHT_SYMTAB
;
5155 symtab_hdr
->sh_flags
= 0;
5156 symtab_hdr
->sh_addr
= 0;
5157 symtab_hdr
->sh_size
= 0;
5158 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
5159 /* sh_link is set in assign_section_numbers. */
5160 /* sh_info is set below. */
5161 /* sh_offset is set just below. */
5162 symtab_hdr
->sh_addralign
= bed
->s
->file_align
;
5164 off
= elf_tdata (abfd
)->next_file_pos
;
5165 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
5167 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5168 incorrect. We do not yet know the size of the .symtab section.
5169 We correct next_file_pos below, after we do know the size. */
5171 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5172 continuously seeking to the right position in the file. */
5173 if (! info
->keep_memory
|| max_sym_count
< 20)
5174 finfo
.symbuf_size
= 20;
5176 finfo
.symbuf_size
= max_sym_count
;
5177 amt
= finfo
.symbuf_size
;
5178 amt
*= sizeof (Elf_External_Sym
);
5179 finfo
.symbuf
= (Elf_External_Sym
*) bfd_malloc (amt
);
5180 if (finfo
.symbuf
== NULL
)
5182 if (elf_numsections (abfd
) > SHN_LORESERVE
)
5184 amt
= finfo
.symbuf_size
;
5185 amt
*= sizeof (Elf_External_Sym_Shndx
);
5186 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5187 if (finfo
.symshndxbuf
== NULL
)
5191 /* Start writing out the symbol table. The first symbol is always a
5193 if (info
->strip
!= strip_all
5196 elfsym
.st_value
= 0;
5199 elfsym
.st_other
= 0;
5200 elfsym
.st_shndx
= SHN_UNDEF
;
5201 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5202 &elfsym
, bfd_und_section_ptr
))
5207 /* Some standard ELF linkers do this, but we don't because it causes
5208 bootstrap comparison failures. */
5209 /* Output a file symbol for the output file as the second symbol.
5210 We output this even if we are discarding local symbols, although
5211 I'm not sure if this is correct. */
5212 elfsym
.st_value
= 0;
5214 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
5215 elfsym
.st_other
= 0;
5216 elfsym
.st_shndx
= SHN_ABS
;
5217 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
5218 &elfsym
, bfd_abs_section_ptr
))
5222 /* Output a symbol for each section. We output these even if we are
5223 discarding local symbols, since they are used for relocs. These
5224 symbols have no names. We store the index of each one in the
5225 index field of the section, so that we can find it again when
5226 outputting relocs. */
5227 if (info
->strip
!= strip_all
5231 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5232 elfsym
.st_other
= 0;
5233 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5235 o
= section_from_elf_index (abfd
, i
);
5237 o
->target_index
= bfd_get_symcount (abfd
);
5238 elfsym
.st_shndx
= i
;
5239 if (info
->relocateable
|| o
== NULL
)
5240 elfsym
.st_value
= 0;
5242 elfsym
.st_value
= o
->vma
;
5243 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5246 if (i
== SHN_LORESERVE
)
5247 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
5251 /* Allocate some memory to hold information read in from the input
5253 if (max_contents_size
!= 0)
5255 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
5256 if (finfo
.contents
== NULL
)
5260 if (max_external_reloc_size
!= 0)
5262 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
5263 if (finfo
.external_relocs
== NULL
)
5267 if (max_internal_reloc_count
!= 0)
5269 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5270 amt
*= sizeof (Elf_Internal_Rela
);
5271 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
5272 if (finfo
.internal_relocs
== NULL
)
5276 if (max_sym_count
!= 0)
5278 amt
= max_sym_count
* sizeof (Elf_External_Sym
);
5279 finfo
.external_syms
= (Elf_External_Sym
*) bfd_malloc (amt
);
5280 if (finfo
.external_syms
== NULL
)
5283 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
5284 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
5285 if (finfo
.internal_syms
== NULL
)
5288 amt
= max_sym_count
* sizeof (long);
5289 finfo
.indices
= (long *) bfd_malloc (amt
);
5290 if (finfo
.indices
== NULL
)
5293 amt
= max_sym_count
* sizeof (asection
*);
5294 finfo
.sections
= (asection
**) bfd_malloc (amt
);
5295 if (finfo
.sections
== NULL
)
5299 if (max_sym_shndx_count
!= 0)
5301 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
5302 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5303 if (finfo
.locsym_shndx
== NULL
)
5307 /* Since ELF permits relocations to be against local symbols, we
5308 must have the local symbols available when we do the relocations.
5309 Since we would rather only read the local symbols once, and we
5310 would rather not keep them in memory, we handle all the
5311 relocations for a single input file at the same time.
5313 Unfortunately, there is no way to know the total number of local
5314 symbols until we have seen all of them, and the local symbol
5315 indices precede the global symbol indices. This means that when
5316 we are generating relocateable output, and we see a reloc against
5317 a global symbol, we can not know the symbol index until we have
5318 finished examining all the local symbols to see which ones we are
5319 going to output. To deal with this, we keep the relocations in
5320 memory, and don't output them until the end of the link. This is
5321 an unfortunate waste of memory, but I don't see a good way around
5322 it. Fortunately, it only happens when performing a relocateable
5323 link, which is not the common case. FIXME: If keep_memory is set
5324 we could write the relocs out and then read them again; I don't
5325 know how bad the memory loss will be. */
5327 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5328 sub
->output_has_begun
= false;
5329 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5331 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
5333 Elf_Internal_Shdr
*rhdr
;
5335 if (p
->type
== bfd_indirect_link_order
5336 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
5337 == bfd_target_elf_flavour
)
5338 && (((rhdr
= &elf_section_data (p
->u
.indirect
.section
)->rel_hdr
)
5340 || rhdr
->sh_entsize
== sizeof (Elf_External_Rel
)
5341 || rhdr
->sh_entsize
== sizeof (Elf_External_Rela
))
5342 && (((rhdr
= elf_section_data (p
->u
.indirect
.section
)->rel_hdr2
)
5344 || rhdr
->sh_entsize
== sizeof (Elf_External_Rel
)
5345 || rhdr
->sh_entsize
== sizeof (Elf_External_Rela
)))
5347 sub
= p
->u
.indirect
.section
->owner
;
5348 if (! sub
->output_has_begun
)
5350 if (! elf_link_input_bfd (&finfo
, sub
))
5352 sub
->output_has_begun
= true;
5355 else if (p
->type
== bfd_section_reloc_link_order
5356 || p
->type
== bfd_symbol_reloc_link_order
)
5358 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
5363 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
5369 /* Output any global symbols that got converted to local in a
5370 version script or due to symbol visibility. We do this in a
5371 separate step since ELF requires all local symbols to appear
5372 prior to any global symbols. FIXME: We should only do this if
5373 some global symbols were, in fact, converted to become local.
5374 FIXME: Will this work correctly with the Irix 5 linker? */
5375 eoinfo
.failed
= false;
5376 eoinfo
.finfo
= &finfo
;
5377 eoinfo
.localsyms
= true;
5378 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5383 /* That wrote out all the local symbols. Finish up the symbol table
5384 with the global symbols. Even if we want to strip everything we
5385 can, we still need to deal with those global symbols that got
5386 converted to local in a version script. */
5388 /* The sh_info field records the index of the first non local symbol. */
5389 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
5392 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
5394 Elf_Internal_Sym sym
;
5395 Elf_External_Sym
*dynsym
=
5396 (Elf_External_Sym
*) finfo
.dynsym_sec
->contents
;
5397 long last_local
= 0;
5399 /* Write out the section symbols for the output sections. */
5406 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5409 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5412 Elf_External_Sym
*dest
;
5414 indx
= elf_section_data (s
)->this_idx
;
5415 BFD_ASSERT (indx
> 0);
5416 sym
.st_shndx
= indx
;
5417 sym
.st_value
= s
->vma
;
5418 dest
= dynsym
+ elf_section_data (s
)->dynindx
;
5419 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5422 last_local
= bfd_count_sections (abfd
);
5425 /* Write out the local dynsyms. */
5426 if (elf_hash_table (info
)->dynlocal
)
5428 struct elf_link_local_dynamic_entry
*e
;
5429 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
5432 Elf_External_Sym
*dest
;
5434 sym
.st_size
= e
->isym
.st_size
;
5435 sym
.st_other
= e
->isym
.st_other
;
5437 /* Copy the internal symbol as is.
5438 Note that we saved a word of storage and overwrote
5439 the original st_name with the dynstr_index. */
5442 if (e
->isym
.st_shndx
!= SHN_UNDEF
5443 && (e
->isym
.st_shndx
< SHN_LORESERVE
5444 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
5446 s
= bfd_section_from_elf_index (e
->input_bfd
,
5450 elf_section_data (s
->output_section
)->this_idx
;
5451 sym
.st_value
= (s
->output_section
->vma
5453 + e
->isym
.st_value
);
5456 if (last_local
< e
->dynindx
)
5457 last_local
= e
->dynindx
;
5459 dest
= dynsym
+ e
->dynindx
;
5460 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5464 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
5468 /* We get the global symbols from the hash table. */
5469 eoinfo
.failed
= false;
5470 eoinfo
.localsyms
= false;
5471 eoinfo
.finfo
= &finfo
;
5472 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5477 /* If backend needs to output some symbols not present in the hash
5478 table, do it now. */
5479 if (bed
->elf_backend_output_arch_syms
)
5481 typedef boolean (*out_sym_func
) PARAMS ((PTR
, const char *,
5485 if (! ((*bed
->elf_backend_output_arch_syms
)
5486 (abfd
, info
, (PTR
) &finfo
, (out_sym_func
) elf_link_output_sym
)))
5490 /* Flush all symbols to the file. */
5491 if (! elf_link_flush_output_syms (&finfo
))
5494 /* Now we know the size of the symtab section. */
5495 off
+= symtab_hdr
->sh_size
;
5497 /* Finish up and write out the symbol string table (.strtab)
5499 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
5500 /* sh_name was set in prep_headers. */
5501 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
5502 symstrtab_hdr
->sh_flags
= 0;
5503 symstrtab_hdr
->sh_addr
= 0;
5504 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
5505 symstrtab_hdr
->sh_entsize
= 0;
5506 symstrtab_hdr
->sh_link
= 0;
5507 symstrtab_hdr
->sh_info
= 0;
5508 /* sh_offset is set just below. */
5509 symstrtab_hdr
->sh_addralign
= 1;
5511 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
5512 elf_tdata (abfd
)->next_file_pos
= off
;
5514 if (bfd_get_symcount (abfd
) > 0)
5516 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
5517 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
5521 /* Adjust the relocs to have the correct symbol indices. */
5522 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5524 if ((o
->flags
& SEC_RELOC
) == 0)
5527 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
5528 elf_section_data (o
)->rel_count
,
5529 elf_section_data (o
)->rel_hashes
);
5530 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
5531 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
5532 elf_section_data (o
)->rel_count2
,
5533 (elf_section_data (o
)->rel_hashes
5534 + elf_section_data (o
)->rel_count
));
5536 /* Set the reloc_count field to 0 to prevent write_relocs from
5537 trying to swap the relocs out itself. */
5541 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
5542 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
5544 /* If we are linking against a dynamic object, or generating a
5545 shared library, finish up the dynamic linking information. */
5548 Elf_External_Dyn
*dyncon
, *dynconend
;
5550 /* Fix up .dynamic entries. */
5551 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
5552 BFD_ASSERT (o
!= NULL
);
5554 dyncon
= (Elf_External_Dyn
*) o
->contents
;
5555 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
5556 for (; dyncon
< dynconend
; dyncon
++)
5558 Elf_Internal_Dyn dyn
;
5562 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
5569 if (relativecount
> 0 && dyncon
+ 1 < dynconend
)
5571 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
5573 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
5574 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
5577 if (dyn
.d_tag
!= DT_NULL
)
5579 dyn
.d_un
.d_val
= relativecount
;
5580 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5586 name
= info
->init_function
;
5589 name
= info
->fini_function
;
5592 struct elf_link_hash_entry
*h
;
5594 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
5595 false, false, true);
5597 && (h
->root
.type
== bfd_link_hash_defined
5598 || h
->root
.type
== bfd_link_hash_defweak
))
5600 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
5601 o
= h
->root
.u
.def
.section
;
5602 if (o
->output_section
!= NULL
)
5603 dyn
.d_un
.d_val
+= (o
->output_section
->vma
5604 + o
->output_offset
);
5607 /* The symbol is imported from another shared
5608 library and does not apply to this one. */
5612 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5617 case DT_PREINIT_ARRAYSZ
:
5618 name
= ".preinit_array";
5620 case DT_INIT_ARRAYSZ
:
5621 name
= ".init_array";
5623 case DT_FINI_ARRAYSZ
:
5624 name
= ".fini_array";
5626 o
= bfd_get_section_by_name (abfd
, name
);
5627 BFD_ASSERT (o
!= NULL
);
5628 if (o
->_raw_size
== 0)
5629 (*_bfd_error_handler
)
5630 (_("warning: %s section has zero size"), name
);
5631 dyn
.d_un
.d_val
= o
->_raw_size
;
5632 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5635 case DT_PREINIT_ARRAY
:
5636 name
= ".preinit_array";
5639 name
= ".init_array";
5642 name
= ".fini_array";
5655 name
= ".gnu.version_d";
5658 name
= ".gnu.version_r";
5661 name
= ".gnu.version";
5663 o
= bfd_get_section_by_name (abfd
, name
);
5664 BFD_ASSERT (o
!= NULL
);
5665 dyn
.d_un
.d_ptr
= o
->vma
;
5666 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5673 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
5678 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5680 Elf_Internal_Shdr
*hdr
;
5682 hdr
= elf_elfsections (abfd
)[i
];
5683 if (hdr
->sh_type
== type
5684 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
5686 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
5687 dyn
.d_un
.d_val
+= hdr
->sh_size
;
5690 if (dyn
.d_un
.d_val
== 0
5691 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
5692 dyn
.d_un
.d_val
= hdr
->sh_addr
;
5696 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5702 /* If we have created any dynamic sections, then output them. */
5705 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
5708 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
5710 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5711 || o
->_raw_size
== 0
5712 || o
->output_section
== bfd_abs_section_ptr
)
5714 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
5716 /* At this point, we are only interested in sections
5717 created by elf_link_create_dynamic_sections. */
5720 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
5722 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
5724 if (! bfd_set_section_contents (abfd
, o
->output_section
,
5726 (file_ptr
) o
->output_offset
,
5732 /* The contents of the .dynstr section are actually in a
5734 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
5735 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
5736 || ! _bfd_elf_strtab_emit (abfd
,
5737 elf_hash_table (info
)->dynstr
))
5743 /* If we have optimized stabs strings, output them. */
5744 if (elf_hash_table (info
)->stab_info
!= NULL
)
5746 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
5750 if (info
->eh_frame_hdr
&& elf_hash_table (info
)->dynobj
)
5752 o
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5755 && (elf_section_data (o
)->sec_info_type
5756 == ELF_INFO_TYPE_EH_FRAME_HDR
))
5758 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, o
))
5763 if (finfo
.symstrtab
!= NULL
)
5764 _bfd_stringtab_free (finfo
.symstrtab
);
5765 if (finfo
.contents
!= NULL
)
5766 free (finfo
.contents
);
5767 if (finfo
.external_relocs
!= NULL
)
5768 free (finfo
.external_relocs
);
5769 if (finfo
.internal_relocs
!= NULL
)
5770 free (finfo
.internal_relocs
);
5771 if (finfo
.external_syms
!= NULL
)
5772 free (finfo
.external_syms
);
5773 if (finfo
.locsym_shndx
!= NULL
)
5774 free (finfo
.locsym_shndx
);
5775 if (finfo
.internal_syms
!= NULL
)
5776 free (finfo
.internal_syms
);
5777 if (finfo
.indices
!= NULL
)
5778 free (finfo
.indices
);
5779 if (finfo
.sections
!= NULL
)
5780 free (finfo
.sections
);
5781 if (finfo
.symbuf
!= NULL
)
5782 free (finfo
.symbuf
);
5783 if (finfo
.symshndxbuf
!= NULL
)
5784 free (finfo
.symbuf
);
5785 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5787 if ((o
->flags
& SEC_RELOC
) != 0
5788 && elf_section_data (o
)->rel_hashes
!= NULL
)
5789 free (elf_section_data (o
)->rel_hashes
);
5792 elf_tdata (abfd
)->linker
= true;
5797 if (finfo
.symstrtab
!= NULL
)
5798 _bfd_stringtab_free (finfo
.symstrtab
);
5799 if (finfo
.contents
!= NULL
)
5800 free (finfo
.contents
);
5801 if (finfo
.external_relocs
!= NULL
)
5802 free (finfo
.external_relocs
);
5803 if (finfo
.internal_relocs
!= NULL
)
5804 free (finfo
.internal_relocs
);
5805 if (finfo
.external_syms
!= NULL
)
5806 free (finfo
.external_syms
);
5807 if (finfo
.locsym_shndx
!= NULL
)
5808 free (finfo
.locsym_shndx
);
5809 if (finfo
.internal_syms
!= NULL
)
5810 free (finfo
.internal_syms
);
5811 if (finfo
.indices
!= NULL
)
5812 free (finfo
.indices
);
5813 if (finfo
.sections
!= NULL
)
5814 free (finfo
.sections
);
5815 if (finfo
.symbuf
!= NULL
)
5816 free (finfo
.symbuf
);
5817 if (finfo
.symshndxbuf
!= NULL
)
5818 free (finfo
.symbuf
);
5819 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5821 if ((o
->flags
& SEC_RELOC
) != 0
5822 && elf_section_data (o
)->rel_hashes
!= NULL
)
5823 free (elf_section_data (o
)->rel_hashes
);
5829 /* Add a symbol to the output symbol table. */
5832 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
5833 struct elf_final_link_info
*finfo
;
5835 Elf_Internal_Sym
*elfsym
;
5836 asection
*input_sec
;
5838 Elf_External_Sym
*dest
;
5839 Elf_External_Sym_Shndx
*destshndx
;
5841 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
5842 struct bfd_link_info
*info
,
5847 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
5848 elf_backend_link_output_symbol_hook
;
5849 if (output_symbol_hook
!= NULL
)
5851 if (! ((*output_symbol_hook
)
5852 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
5856 if (name
== (const char *) NULL
|| *name
== '\0')
5857 elfsym
->st_name
= 0;
5858 else if (input_sec
->flags
& SEC_EXCLUDE
)
5859 elfsym
->st_name
= 0;
5862 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5864 if (elfsym
->st_name
== (unsigned long) -1)
5868 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5870 if (! elf_link_flush_output_syms (finfo
))
5874 dest
= finfo
->symbuf
+ finfo
->symbuf_count
;
5875 destshndx
= finfo
->symshndxbuf
;
5876 if (destshndx
!= NULL
)
5877 destshndx
+= finfo
->symbuf_count
;
5878 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
, (PTR
) dest
, (PTR
) destshndx
);
5879 ++finfo
->symbuf_count
;
5881 ++ bfd_get_symcount (finfo
->output_bfd
);
5886 /* Flush the output symbols to the file. */
5889 elf_link_flush_output_syms (finfo
)
5890 struct elf_final_link_info
*finfo
;
5892 if (finfo
->symbuf_count
> 0)
5894 Elf_Internal_Shdr
*hdr
;
5898 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5899 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5900 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
5901 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5902 || bfd_bwrite ((PTR
) finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
5905 hdr
->sh_size
+= amt
;
5907 if (finfo
->symshndxbuf
!= NULL
)
5909 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_shndx_hdr
;
5910 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5911 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym_Shndx
);
5912 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5913 || (bfd_bwrite ((PTR
) finfo
->symshndxbuf
, amt
, finfo
->output_bfd
)
5917 hdr
->sh_size
+= amt
;
5920 finfo
->symbuf_count
= 0;
5926 /* Adjust all external symbols pointing into SEC_MERGE sections
5927 to reflect the object merging within the sections. */
5930 elf_link_sec_merge_syms (h
, data
)
5931 struct elf_link_hash_entry
*h
;
5936 if ((h
->root
.type
== bfd_link_hash_defined
5937 || h
->root
.type
== bfd_link_hash_defweak
)
5938 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
5939 && elf_section_data (sec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
)
5941 bfd
*output_bfd
= (bfd
*) data
;
5943 h
->root
.u
.def
.value
=
5944 _bfd_merged_section_offset (output_bfd
,
5945 &h
->root
.u
.def
.section
,
5946 elf_section_data (sec
)->sec_info
,
5947 h
->root
.u
.def
.value
, (bfd_vma
) 0);
5953 /* Add an external symbol to the symbol table. This is called from
5954 the hash table traversal routine. When generating a shared object,
5955 we go through the symbol table twice. The first time we output
5956 anything that might have been forced to local scope in a version
5957 script. The second time we output the symbols that are still
5961 elf_link_output_extsym (h
, data
)
5962 struct elf_link_hash_entry
*h
;
5965 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
5966 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5968 Elf_Internal_Sym sym
;
5969 asection
*input_sec
;
5971 /* Decide whether to output this symbol in this pass. */
5972 if (eoinfo
->localsyms
)
5974 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5979 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5983 /* If we are not creating a shared library, and this symbol is
5984 referenced by a shared library but is not defined anywhere, then
5985 warn that it is undefined. If we do not do this, the runtime
5986 linker will complain that the symbol is undefined when the
5987 program is run. We don't have to worry about symbols that are
5988 referenced by regular files, because we will already have issued
5989 warnings for them. */
5990 if (! finfo
->info
->relocateable
5991 && ! finfo
->info
->allow_shlib_undefined
5992 && ! finfo
->info
->shared
5993 && h
->root
.type
== bfd_link_hash_undefined
5994 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5995 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5997 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5998 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5999 (asection
*) NULL
, (bfd_vma
) 0, true)))
6001 eoinfo
->failed
= true;
6006 /* We don't want to output symbols that have never been mentioned by
6007 a regular file, or that we have been told to strip. However, if
6008 h->indx is set to -2, the symbol is used by a reloc and we must
6012 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
6013 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
6014 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
6015 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
6017 else if (finfo
->info
->strip
== strip_all
6018 || (finfo
->info
->strip
== strip_some
6019 && bfd_hash_lookup (finfo
->info
->keep_hash
,
6020 h
->root
.root
.string
,
6021 false, false) == NULL
))
6026 /* If we're stripping it, and it's not a dynamic symbol, there's
6027 nothing else to do unless it is a forced local symbol. */
6030 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6034 sym
.st_size
= h
->size
;
6035 sym
.st_other
= h
->other
;
6036 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6037 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6038 else if (h
->root
.type
== bfd_link_hash_undefweak
6039 || h
->root
.type
== bfd_link_hash_defweak
)
6040 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6042 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6044 switch (h
->root
.type
)
6047 case bfd_link_hash_new
:
6051 case bfd_link_hash_undefined
:
6052 case bfd_link_hash_undefweak
:
6053 input_sec
= bfd_und_section_ptr
;
6054 sym
.st_shndx
= SHN_UNDEF
;
6057 case bfd_link_hash_defined
:
6058 case bfd_link_hash_defweak
:
6060 input_sec
= h
->root
.u
.def
.section
;
6061 if (input_sec
->output_section
!= NULL
)
6064 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6065 input_sec
->output_section
);
6066 if (sym
.st_shndx
== SHN_BAD
)
6068 (*_bfd_error_handler
)
6069 (_("%s: could not find output section %s for input section %s"),
6070 bfd_get_filename (finfo
->output_bfd
),
6071 input_sec
->output_section
->name
,
6073 eoinfo
->failed
= true;
6077 /* ELF symbols in relocateable files are section relative,
6078 but in nonrelocateable files they are virtual
6080 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6081 if (! finfo
->info
->relocateable
)
6082 sym
.st_value
+= input_sec
->output_section
->vma
;
6086 BFD_ASSERT (input_sec
->owner
== NULL
6087 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6088 sym
.st_shndx
= SHN_UNDEF
;
6089 input_sec
= bfd_und_section_ptr
;
6094 case bfd_link_hash_common
:
6095 input_sec
= h
->root
.u
.c
.p
->section
;
6096 sym
.st_shndx
= SHN_COMMON
;
6097 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6100 case bfd_link_hash_indirect
:
6101 /* These symbols are created by symbol versioning. They point
6102 to the decorated version of the name. For example, if the
6103 symbol foo@@GNU_1.2 is the default, which should be used when
6104 foo is used with no version, then we add an indirect symbol
6105 foo which points to foo@@GNU_1.2. We ignore these symbols,
6106 since the indirected symbol is already in the hash table. */
6109 case bfd_link_hash_warning
:
6110 /* We can't represent these symbols in ELF, although a warning
6111 symbol may have come from a .gnu.warning.SYMBOL section. We
6112 just put the target symbol in the hash table. If the target
6113 symbol does not really exist, don't do anything. */
6114 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
6116 return (elf_link_output_extsym
6117 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
6120 /* Give the processor backend a chance to tweak the symbol value,
6121 and also to finish up anything that needs to be done for this
6122 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6123 forced local syms when non-shared is due to a historical quirk. */
6124 if ((h
->dynindx
!= -1
6125 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6126 && (finfo
->info
->shared
6127 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6128 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6130 struct elf_backend_data
*bed
;
6132 bed
= get_elf_backend_data (finfo
->output_bfd
);
6133 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6134 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6136 eoinfo
->failed
= true;
6141 /* If we are marking the symbol as undefined, and there are no
6142 non-weak references to this symbol from a regular object, then
6143 mark the symbol as weak undefined; if there are non-weak
6144 references, mark the symbol as strong. We can't do this earlier,
6145 because it might not be marked as undefined until the
6146 finish_dynamic_symbol routine gets through with it. */
6147 if (sym
.st_shndx
== SHN_UNDEF
6148 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6149 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6150 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6154 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6155 bindtype
= STB_GLOBAL
;
6157 bindtype
= STB_WEAK
;
6158 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6161 /* If a symbol is not defined locally, we clear the visibility
6163 if (! finfo
->info
->relocateable
6164 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6165 sym
.st_other
^= ELF_ST_VISIBILITY (sym
.st_other
);
6167 /* If this symbol should be put in the .dynsym section, then put it
6168 there now. We have already know the symbol index. We also fill
6169 in the entry in the .hash section. */
6170 if (h
->dynindx
!= -1
6171 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6175 size_t hash_entry_size
;
6176 bfd_byte
*bucketpos
;
6178 Elf_External_Sym
*esym
;
6180 sym
.st_name
= h
->dynstr_index
;
6181 esym
= (Elf_External_Sym
*) finfo
->dynsym_sec
->contents
+ h
->dynindx
;
6182 elf_swap_symbol_out (finfo
->output_bfd
, &sym
, (PTR
) esym
, (PTR
) 0);
6184 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6185 bucket
= h
->elf_hash_value
% bucketcount
;
6187 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6188 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6189 + (bucket
+ 2) * hash_entry_size
);
6190 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6191 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, (bfd_vma
) h
->dynindx
,
6193 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6194 ((bfd_byte
*) finfo
->hash_sec
->contents
6195 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6197 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6199 Elf_Internal_Versym iversym
;
6200 Elf_External_Versym
*eversym
;
6202 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6204 if (h
->verinfo
.verdef
== NULL
)
6205 iversym
.vs_vers
= 0;
6207 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6211 if (h
->verinfo
.vertree
== NULL
)
6212 iversym
.vs_vers
= 1;
6214 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6217 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6218 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6220 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6221 eversym
+= h
->dynindx
;
6222 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6226 /* If we're stripping it, then it was just a dynamic symbol, and
6227 there's nothing else to do. */
6231 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6233 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
6235 eoinfo
->failed
= true;
6242 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6243 originated from the section given by INPUT_REL_HDR) to the
6247 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
6250 asection
*input_section
;
6251 Elf_Internal_Shdr
*input_rel_hdr
;
6252 Elf_Internal_Rela
*internal_relocs
;
6254 Elf_Internal_Rela
*irela
;
6255 Elf_Internal_Rela
*irelaend
;
6256 Elf_Internal_Shdr
*output_rel_hdr
;
6257 asection
*output_section
;
6258 unsigned int *rel_countp
= NULL
;
6259 struct elf_backend_data
*bed
;
6262 output_section
= input_section
->output_section
;
6263 output_rel_hdr
= NULL
;
6265 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
6266 == input_rel_hdr
->sh_entsize
)
6268 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
6269 rel_countp
= &elf_section_data (output_section
)->rel_count
;
6271 else if (elf_section_data (output_section
)->rel_hdr2
6272 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
6273 == input_rel_hdr
->sh_entsize
))
6275 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
6276 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
6279 BFD_ASSERT (output_rel_hdr
!= NULL
);
6281 bed
= get_elf_backend_data (output_bfd
);
6282 irela
= internal_relocs
;
6283 irelaend
= irela
+ NUM_SHDR_ENTRIES (input_rel_hdr
)
6284 * bed
->s
->int_rels_per_ext_rel
;
6286 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
6288 Elf_External_Rel
*erel
;
6289 Elf_Internal_Rel
*irel
;
6291 amt
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
6292 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
6295 (*_bfd_error_handler
) (_("Error: out of memory"));
6299 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
6300 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erel
++)
6304 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
6306 irel
[i
].r_offset
= irela
[i
].r_offset
;
6307 irel
[i
].r_info
= irela
[i
].r_info
;
6308 BFD_ASSERT (irela
[i
].r_addend
== 0);
6311 if (bed
->s
->swap_reloc_out
)
6312 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (PTR
) erel
);
6314 elf_swap_reloc_out (output_bfd
, irel
, erel
);
6321 Elf_External_Rela
*erela
;
6323 BFD_ASSERT (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
6325 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
6326 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erela
++)
6327 if (bed
->s
->swap_reloca_out
)
6328 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (PTR
) erela
);
6330 elf_swap_reloca_out (output_bfd
, irela
, erela
);
6333 /* Bump the counter, so that we know where to add the next set of
6335 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
6338 /* Link an input file into the linker output file. This function
6339 handles all the sections and relocations of the input file at once.
6340 This is so that we only have to read the local symbols once, and
6341 don't have to keep them in memory. */
6344 elf_link_input_bfd (finfo
, input_bfd
)
6345 struct elf_final_link_info
*finfo
;
6348 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
6349 bfd
*, asection
*, bfd_byte
*,
6350 Elf_Internal_Rela
*,
6351 Elf_Internal_Sym
*, asection
**));
6353 Elf_Internal_Shdr
*symtab_hdr
;
6354 Elf_Internal_Shdr
*shndx_hdr
;
6357 Elf_External_Sym
*external_syms
;
6358 Elf_External_Sym
*esym
;
6359 Elf_External_Sym
*esymend
;
6360 Elf_External_Sym_Shndx
*shndx_buf
;
6361 Elf_External_Sym_Shndx
*shndx
;
6362 Elf_Internal_Sym
*isym
;
6364 asection
**ppsection
;
6366 struct elf_backend_data
*bed
;
6367 boolean emit_relocs
;
6368 struct elf_link_hash_entry
**sym_hashes
;
6370 output_bfd
= finfo
->output_bfd
;
6371 bed
= get_elf_backend_data (output_bfd
);
6372 relocate_section
= bed
->elf_backend_relocate_section
;
6374 /* If this is a dynamic object, we don't want to do anything here:
6375 we don't want the local symbols, and we don't want the section
6377 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6380 emit_relocs
= (finfo
->info
->relocateable
6381 || finfo
->info
->emitrelocations
6382 || bed
->elf_backend_emit_relocs
);
6384 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6385 if (elf_bad_symtab (input_bfd
))
6387 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6392 locsymcount
= symtab_hdr
->sh_info
;
6393 extsymoff
= symtab_hdr
->sh_info
;
6396 /* Read the local symbols. */
6397 if (symtab_hdr
->contents
!= NULL
)
6398 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6399 else if (locsymcount
== 0)
6400 external_syms
= NULL
;
6403 bfd_size_type amt
= locsymcount
* sizeof (Elf_External_Sym
);
6404 external_syms
= finfo
->external_syms
;
6405 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6406 || bfd_bread (external_syms
, amt
, input_bfd
) != amt
)
6410 shndx_hdr
= &elf_tdata (input_bfd
)->symtab_shndx_hdr
;
6412 if (shndx_hdr
->sh_size
!= 0 && locsymcount
!= 0)
6414 bfd_size_type amt
= locsymcount
* sizeof (Elf_External_Sym_Shndx
);
6415 shndx_buf
= finfo
->locsym_shndx
;
6416 if (bfd_seek (input_bfd
, shndx_hdr
->sh_offset
, SEEK_SET
) != 0
6417 || bfd_bread (shndx_buf
, amt
, input_bfd
) != amt
)
6421 /* Swap in the local symbols and write out the ones which we know
6422 are going into the output file. */
6423 for (esym
= external_syms
, esymend
= esym
+ locsymcount
,
6424 isym
= finfo
->internal_syms
, pindex
= finfo
->indices
,
6425 ppsection
= finfo
->sections
, shndx
= shndx_buf
;
6427 esym
++, isym
++, pindex
++, ppsection
++,
6428 shndx
= (shndx
!= NULL
? shndx
+ 1 : NULL
))
6432 Elf_Internal_Sym osym
;
6434 elf_swap_symbol_in (input_bfd
, esym
, shndx
, isym
);
6437 if (elf_bad_symtab (input_bfd
))
6439 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6446 if (isym
->st_shndx
== SHN_UNDEF
)
6447 isec
= bfd_und_section_ptr
;
6448 else if (isym
->st_shndx
< SHN_LORESERVE
6449 || isym
->st_shndx
> SHN_HIRESERVE
)
6451 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
6453 && elf_section_data (isec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
6454 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6456 _bfd_merged_section_offset (output_bfd
, &isec
,
6457 elf_section_data (isec
)->sec_info
,
6458 isym
->st_value
, (bfd_vma
) 0);
6460 else if (isym
->st_shndx
== SHN_ABS
)
6461 isec
= bfd_abs_section_ptr
;
6462 else if (isym
->st_shndx
== SHN_COMMON
)
6463 isec
= bfd_com_section_ptr
;
6472 /* Don't output the first, undefined, symbol. */
6473 if (esym
== external_syms
)
6476 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6478 /* We never output section symbols. Instead, we use the
6479 section symbol of the corresponding section in the output
6484 /* If we are stripping all symbols, we don't want to output this
6486 if (finfo
->info
->strip
== strip_all
)
6489 /* If we are discarding all local symbols, we don't want to
6490 output this one. If we are generating a relocateable output
6491 file, then some of the local symbols may be required by
6492 relocs; we output them below as we discover that they are
6494 if (finfo
->info
->discard
== discard_all
)
6497 /* If this symbol is defined in a section which we are
6498 discarding, we don't need to keep it, but note that
6499 linker_mark is only reliable for sections that have contents.
6500 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6501 as well as linker_mark. */
6502 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6504 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6505 || (! finfo
->info
->relocateable
6506 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6509 /* Get the name of the symbol. */
6510 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6515 /* See if we are discarding symbols with this name. */
6516 if ((finfo
->info
->strip
== strip_some
6517 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
6519 || (((finfo
->info
->discard
== discard_sec_merge
6520 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocateable
)
6521 || finfo
->info
->discard
== discard_l
)
6522 && bfd_is_local_label_name (input_bfd
, name
)))
6525 /* If we get here, we are going to output this symbol. */
6529 /* Adjust the section index for the output file. */
6530 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6531 isec
->output_section
);
6532 if (osym
.st_shndx
== SHN_BAD
)
6535 *pindex
= bfd_get_symcount (output_bfd
);
6537 /* ELF symbols in relocateable files are section relative, but
6538 in executable files they are virtual addresses. Note that
6539 this code assumes that all ELF sections have an associated
6540 BFD section with a reasonable value for output_offset; below
6541 we assume that they also have a reasonable value for
6542 output_section. Any special sections must be set up to meet
6543 these requirements. */
6544 osym
.st_value
+= isec
->output_offset
;
6545 if (! finfo
->info
->relocateable
)
6546 osym
.st_value
+= isec
->output_section
->vma
;
6548 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
6552 /* Relocate the contents of each section. */
6553 sym_hashes
= elf_sym_hashes (input_bfd
);
6554 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6558 if (! o
->linker_mark
)
6560 /* This section was omitted from the link. */
6564 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6565 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6568 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6570 /* Section was created by elf_link_create_dynamic_sections
6575 /* Get the contents of the section. They have been cached by a
6576 relaxation routine. Note that o is a section in an input
6577 file, so the contents field will not have been set by any of
6578 the routines which work on output files. */
6579 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6580 contents
= elf_section_data (o
)->this_hdr
.contents
;
6583 contents
= finfo
->contents
;
6584 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
6585 (file_ptr
) 0, o
->_raw_size
))
6589 if ((o
->flags
& SEC_RELOC
) != 0)
6591 Elf_Internal_Rela
*internal_relocs
;
6593 /* Get the swapped relocs. */
6594 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6595 (input_bfd
, o
, finfo
->external_relocs
,
6596 finfo
->internal_relocs
, false));
6597 if (internal_relocs
== NULL
6598 && o
->reloc_count
> 0)
6601 /* Run through the relocs looking for any against symbols
6602 from discarded sections and section symbols from
6603 removed link-once sections. Complain about relocs
6604 against discarded sections. Zero relocs against removed
6605 link-once sections. We should really complain if
6606 anything in the final link tries to use it, but
6607 DWARF-based exception handling might have an entry in
6608 .eh_frame to describe a routine in the linkonce section,
6609 and it turns out to be hard to remove the .eh_frame
6610 entry too. FIXME. */
6611 if (!finfo
->info
->relocateable
6612 && !elf_section_ignore_discarded_relocs (o
))
6614 Elf_Internal_Rela
*rel
, *relend
;
6616 rel
= internal_relocs
;
6617 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6618 for ( ; rel
< relend
; rel
++)
6620 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6622 if (r_symndx
>= locsymcount
6623 || (elf_bad_symtab (input_bfd
)
6624 && finfo
->sections
[r_symndx
] == NULL
))
6626 struct elf_link_hash_entry
*h
;
6628 h
= sym_hashes
[r_symndx
- extsymoff
];
6629 while (h
->root
.type
== bfd_link_hash_indirect
6630 || h
->root
.type
== bfd_link_hash_warning
)
6631 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6633 /* Complain if the definition comes from a
6634 discarded section. */
6635 if ((h
->root
.type
== bfd_link_hash_defined
6636 || h
->root
.type
== bfd_link_hash_defweak
)
6637 && elf_discarded_section (h
->root
.u
.def
.section
))
6639 #if BFD_VERSION_DATE < 20031005
6640 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6642 #if BFD_VERSION_DATE > 20021005
6643 (*finfo
->info
->callbacks
->warning
)
6645 _("warning: relocation against removed section; zeroing"),
6646 NULL
, input_bfd
, o
, rel
->r_offset
);
6648 BFD_ASSERT (r_symndx
!= 0);
6649 memset (rel
, 0, sizeof (*rel
));
6654 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6655 (finfo
->info
, h
->root
.root
.string
,
6656 input_bfd
, o
, rel
->r_offset
,
6664 asection
*sec
= finfo
->sections
[r_symndx
];
6666 if (sec
!= NULL
&& elf_discarded_section (sec
))
6668 #if BFD_VERSION_DATE < 20031005
6669 if ((o
->flags
& SEC_DEBUGGING
) != 0
6670 || (sec
->flags
& SEC_LINK_ONCE
) != 0)
6672 #if BFD_VERSION_DATE > 20021005
6673 (*finfo
->info
->callbacks
->warning
)
6675 _("warning: relocation against removed section"),
6676 NULL
, input_bfd
, o
, rel
->r_offset
);
6678 BFD_ASSERT (r_symndx
!= 0);
6680 = ELF_R_INFO (0, ELF_R_TYPE (rel
->r_info
));
6688 = _("local symbols in discarded section %s");
6690 = strlen (sec
->name
) + strlen (msg
) - 1;
6691 char *buf
= (char *) bfd_malloc (amt
);
6694 sprintf (buf
, msg
, sec
->name
);
6696 buf
= (char *) sec
->name
;
6697 ok
= (*finfo
->info
->callbacks
6698 ->undefined_symbol
) (finfo
->info
, buf
,
6702 if (buf
!= sec
->name
)
6712 /* Relocate the section by invoking a back end routine.
6714 The back end routine is responsible for adjusting the
6715 section contents as necessary, and (if using Rela relocs
6716 and generating a relocateable output file) adjusting the
6717 reloc addend as necessary.
6719 The back end routine does not have to worry about setting
6720 the reloc address or the reloc symbol index.
6722 The back end routine is given a pointer to the swapped in
6723 internal symbols, and can access the hash table entries
6724 for the external symbols via elf_sym_hashes (input_bfd).
6726 When generating relocateable output, the back end routine
6727 must handle STB_LOCAL/STT_SECTION symbols specially. The
6728 output symbol is going to be a section symbol
6729 corresponding to the output section, which will require
6730 the addend to be adjusted. */
6732 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6733 input_bfd
, o
, contents
,
6735 finfo
->internal_syms
,
6741 Elf_Internal_Rela
*irela
;
6742 Elf_Internal_Rela
*irelaend
;
6743 struct elf_link_hash_entry
**rel_hash
;
6744 Elf_Internal_Shdr
*input_rel_hdr
;
6745 unsigned int next_erel
;
6746 void (*reloc_emitter
) PARAMS ((bfd
*, asection
*,
6747 Elf_Internal_Shdr
*,
6748 Elf_Internal_Rela
*));
6750 /* Adjust the reloc addresses and symbol indices. */
6752 irela
= internal_relocs
;
6753 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6754 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6755 + elf_section_data (o
->output_section
)->rel_count
6756 + elf_section_data (o
->output_section
)->rel_count2
);
6757 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6759 unsigned long r_symndx
;
6762 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6768 irela
->r_offset
+= o
->output_offset
;
6770 /* Relocs in an executable have to be virtual addresses. */
6771 if (finfo
->info
->emitrelocations
)
6772 irela
->r_offset
+= o
->output_section
->vma
;
6774 r_symndx
= ELF_R_SYM (irela
->r_info
);
6779 if (r_symndx
>= locsymcount
6780 || (elf_bad_symtab (input_bfd
)
6781 && finfo
->sections
[r_symndx
] == NULL
))
6783 struct elf_link_hash_entry
*rh
;
6786 /* This is a reloc against a global symbol. We
6787 have not yet output all the local symbols, so
6788 we do not know the symbol index of any global
6789 symbol. We set the rel_hash entry for this
6790 reloc to point to the global hash table entry
6791 for this symbol. The symbol index is then
6792 set at the end of elf_bfd_final_link. */
6793 indx
= r_symndx
- extsymoff
;
6794 rh
= elf_sym_hashes (input_bfd
)[indx
];
6795 while (rh
->root
.type
== bfd_link_hash_indirect
6796 || rh
->root
.type
== bfd_link_hash_warning
)
6797 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
6799 /* Setting the index to -2 tells
6800 elf_link_output_extsym that this symbol is
6802 BFD_ASSERT (rh
->indx
< 0);
6810 /* This is a reloc against a local symbol. */
6813 isym
= finfo
->internal_syms
+ r_symndx
;
6814 sec
= finfo
->sections
[r_symndx
];
6815 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6817 /* I suppose the backend ought to fill in the
6818 section of any STT_SECTION symbol against a
6819 processor specific section. If we have
6820 discarded a section, the output_section will
6821 be the absolute section. */
6823 && (bfd_is_abs_section (sec
)
6824 || (sec
->output_section
!= NULL
6825 && bfd_is_abs_section (sec
->output_section
))))
6827 else if (sec
== NULL
|| sec
->owner
== NULL
)
6829 bfd_set_error (bfd_error_bad_value
);
6834 r_symndx
= sec
->output_section
->target_index
;
6835 BFD_ASSERT (r_symndx
!= 0);
6840 if (finfo
->indices
[r_symndx
] == -1)
6842 unsigned long shlink
;
6846 if (finfo
->info
->strip
== strip_all
)
6848 /* You can't do ld -r -s. */
6849 bfd_set_error (bfd_error_invalid_operation
);
6853 /* This symbol was skipped earlier, but
6854 since it is needed by a reloc, we
6855 must output it now. */
6856 shlink
= symtab_hdr
->sh_link
;
6857 name
= (bfd_elf_string_from_elf_section
6858 (input_bfd
, shlink
, isym
->st_name
));
6862 osec
= sec
->output_section
;
6864 _bfd_elf_section_from_bfd_section (output_bfd
,
6866 if (isym
->st_shndx
== SHN_BAD
)
6869 isym
->st_value
+= sec
->output_offset
;
6870 if (! finfo
->info
->relocateable
)
6871 isym
->st_value
+= osec
->vma
;
6873 finfo
->indices
[r_symndx
]
6874 = bfd_get_symcount (output_bfd
);
6876 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
6880 r_symndx
= finfo
->indices
[r_symndx
];
6883 irela
->r_info
= ELF_R_INFO (r_symndx
,
6884 ELF_R_TYPE (irela
->r_info
));
6887 /* Swap out the relocs. */
6888 if (bed
->elf_backend_emit_relocs
6889 && !(finfo
->info
->relocateable
6890 || finfo
->info
->emitrelocations
))
6891 reloc_emitter
= bed
->elf_backend_emit_relocs
;
6893 reloc_emitter
= elf_link_output_relocs
;
6895 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6896 (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
, internal_relocs
);
6898 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
6901 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
6902 * bed
->s
->int_rels_per_ext_rel
);
6903 reloc_emitter (output_bfd
, o
, input_rel_hdr
, internal_relocs
);
6909 /* Write out the modified section contents. */
6910 if (bed
->elf_backend_write_section
6911 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
6913 /* Section written out. */
6915 else switch (elf_section_data (o
)->sec_info_type
)
6917 case ELF_INFO_TYPE_STABS
:
6918 if (! (_bfd_write_section_stabs
6920 &elf_hash_table (finfo
->info
)->stab_info
,
6921 o
, &elf_section_data (o
)->sec_info
, contents
)))
6924 case ELF_INFO_TYPE_MERGE
:
6925 if (! (_bfd_write_merged_section
6926 (output_bfd
, o
, elf_section_data (o
)->sec_info
)))
6929 case ELF_INFO_TYPE_EH_FRAME
:
6934 = bfd_get_section_by_name (elf_hash_table (finfo
->info
)->dynobj
,
6936 if (! (_bfd_elf_write_section_eh_frame (output_bfd
, o
, ehdrsec
,
6943 bfd_size_type sec_size
;
6945 sec_size
= (o
->_cooked_size
!= 0 ? o
->_cooked_size
: o
->_raw_size
);
6946 if (! (o
->flags
& SEC_EXCLUDE
)
6947 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
6949 (file_ptr
) o
->output_offset
,
6960 /* Generate a reloc when linking an ELF file. This is a reloc
6961 requested by the linker, and does come from any input file. This
6962 is used to build constructor and destructor tables when linking
6966 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
6968 struct bfd_link_info
*info
;
6969 asection
*output_section
;
6970 struct bfd_link_order
*link_order
;
6972 reloc_howto_type
*howto
;
6976 struct elf_link_hash_entry
**rel_hash_ptr
;
6977 Elf_Internal_Shdr
*rel_hdr
;
6978 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
6980 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
6983 bfd_set_error (bfd_error_bad_value
);
6987 addend
= link_order
->u
.reloc
.p
->addend
;
6989 /* Figure out the symbol index. */
6990 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
6991 + elf_section_data (output_section
)->rel_count
6992 + elf_section_data (output_section
)->rel_count2
);
6993 if (link_order
->type
== bfd_section_reloc_link_order
)
6995 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
6996 BFD_ASSERT (indx
!= 0);
6997 *rel_hash_ptr
= NULL
;
7001 struct elf_link_hash_entry
*h
;
7003 /* Treat a reloc against a defined symbol as though it were
7004 actually against the section. */
7005 h
= ((struct elf_link_hash_entry
*)
7006 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
7007 link_order
->u
.reloc
.p
->u
.name
,
7008 false, false, true));
7010 && (h
->root
.type
== bfd_link_hash_defined
7011 || h
->root
.type
== bfd_link_hash_defweak
))
7015 section
= h
->root
.u
.def
.section
;
7016 indx
= section
->output_section
->target_index
;
7017 *rel_hash_ptr
= NULL
;
7018 /* It seems that we ought to add the symbol value to the
7019 addend here, but in practice it has already been added
7020 because it was passed to constructor_callback. */
7021 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7025 /* Setting the index to -2 tells elf_link_output_extsym that
7026 this symbol is used by a reloc. */
7033 if (! ((*info
->callbacks
->unattached_reloc
)
7034 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
7035 (asection
*) NULL
, (bfd_vma
) 0)))
7041 /* If this is an inplace reloc, we must write the addend into the
7043 if (howto
->partial_inplace
&& addend
!= 0)
7046 bfd_reloc_status_type rstat
;
7049 const char *sym_name
;
7051 size
= bfd_get_reloc_size (howto
);
7052 buf
= (bfd_byte
*) bfd_zmalloc (size
);
7053 if (buf
== (bfd_byte
*) NULL
)
7055 rstat
= _bfd_relocate_contents (howto
, output_bfd
, (bfd_vma
) addend
, buf
);
7062 case bfd_reloc_outofrange
:
7065 case bfd_reloc_overflow
:
7066 if (link_order
->type
== bfd_section_reloc_link_order
)
7067 sym_name
= bfd_section_name (output_bfd
,
7068 link_order
->u
.reloc
.p
->u
.section
);
7070 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7071 if (! ((*info
->callbacks
->reloc_overflow
)
7072 (info
, sym_name
, howto
->name
, addend
,
7073 (bfd
*) NULL
, (asection
*) NULL
, (bfd_vma
) 0)))
7080 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
7081 (file_ptr
) link_order
->offset
, size
);
7087 /* The address of a reloc is relative to the section in a
7088 relocateable file, and is a virtual address in an executable
7090 offset
= link_order
->offset
;
7091 if (! info
->relocateable
)
7092 offset
+= output_section
->vma
;
7094 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7096 if (rel_hdr
->sh_type
== SHT_REL
)
7099 Elf_Internal_Rel
*irel
;
7100 Elf_External_Rel
*erel
;
7103 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
7104 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (size
);
7108 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7109 irel
[i
].r_offset
= offset
;
7110 irel
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7112 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
7113 + elf_section_data (output_section
)->rel_count
);
7115 if (bed
->s
->swap_reloc_out
)
7116 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (bfd_byte
*) erel
);
7118 elf_swap_reloc_out (output_bfd
, irel
, erel
);
7125 Elf_Internal_Rela
*irela
;
7126 Elf_External_Rela
*erela
;
7129 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
7130 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (size
);
7134 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7135 irela
[i
].r_offset
= offset
;
7136 irela
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7137 irela
[0].r_addend
= addend
;
7139 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
7140 + elf_section_data (output_section
)->rel_count
);
7142 if (bed
->s
->swap_reloca_out
)
7143 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (bfd_byte
*) erela
);
7145 elf_swap_reloca_out (output_bfd
, irela
, erela
);
7148 ++elf_section_data (output_section
)->rel_count
;
7153 /* Allocate a pointer to live in a linker created section. */
7156 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
7158 struct bfd_link_info
*info
;
7159 elf_linker_section_t
*lsect
;
7160 struct elf_link_hash_entry
*h
;
7161 const Elf_Internal_Rela
*rel
;
7163 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
7164 elf_linker_section_pointers_t
*linker_section_ptr
;
7165 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7168 BFD_ASSERT (lsect
!= NULL
);
7170 /* Is this a global symbol? */
7173 /* Has this symbol already been allocated? If so, our work is done. */
7174 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
7179 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
7180 /* Make sure this symbol is output as a dynamic symbol. */
7181 if (h
->dynindx
== -1)
7183 if (! elf_link_record_dynamic_symbol (info
, h
))
7187 if (lsect
->rel_section
)
7188 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7192 /* Allocation of a pointer to a local symbol. */
7193 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
7195 /* Allocate a table to hold the local symbols if first time. */
7198 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
7199 register unsigned int i
;
7202 amt
*= sizeof (elf_linker_section_pointers_t
*);
7203 ptr
= (elf_linker_section_pointers_t
**) bfd_alloc (abfd
, amt
);
7208 elf_local_ptr_offsets (abfd
) = ptr
;
7209 for (i
= 0; i
< num_symbols
; i
++)
7210 ptr
[i
] = (elf_linker_section_pointers_t
*) 0;
7213 /* Has this symbol already been allocated? If so, our work is done. */
7214 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
7219 ptr_linker_section_ptr
= &ptr
[r_symndx
];
7223 /* If we are generating a shared object, we need to
7224 output a R_<xxx>_RELATIVE reloc so that the
7225 dynamic linker can adjust this GOT entry. */
7226 BFD_ASSERT (lsect
->rel_section
!= NULL
);
7227 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7231 /* Allocate space for a pointer in the linker section, and allocate
7232 a new pointer record from internal memory. */
7233 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
7234 amt
= sizeof (elf_linker_section_pointers_t
);
7235 linker_section_ptr
= (elf_linker_section_pointers_t
*) bfd_alloc (abfd
, amt
);
7237 if (!linker_section_ptr
)
7240 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
7241 linker_section_ptr
->addend
= rel
->r_addend
;
7242 linker_section_ptr
->which
= lsect
->which
;
7243 linker_section_ptr
->written_address_p
= false;
7244 *ptr_linker_section_ptr
= linker_section_ptr
;
7247 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
7249 linker_section_ptr
->offset
= (lsect
->section
->_raw_size
7250 - lsect
->hole_size
+ (ARCH_SIZE
/ 8));
7251 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
7252 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
7253 if (lsect
->sym_hash
)
7255 /* Bump up symbol value if needed. */
7256 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
7258 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
7259 lsect
->sym_hash
->root
.root
.string
,
7260 (long) ARCH_SIZE
/ 8,
7261 (long) lsect
->sym_hash
->root
.u
.def
.value
);
7267 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
7269 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
7273 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7274 lsect
->name
, (long) linker_section_ptr
->offset
,
7275 (long) lsect
->section
->_raw_size
);
7282 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7285 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7288 /* Fill in the address for a pointer generated in a linker section. */
7291 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
,
7292 relocation
, rel
, relative_reloc
)
7295 struct bfd_link_info
*info
;
7296 elf_linker_section_t
*lsect
;
7297 struct elf_link_hash_entry
*h
;
7299 const Elf_Internal_Rela
*rel
;
7302 elf_linker_section_pointers_t
*linker_section_ptr
;
7304 BFD_ASSERT (lsect
!= NULL
);
7308 /* Handle global symbol. */
7309 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7310 (h
->linker_section_pointer
,
7314 BFD_ASSERT (linker_section_ptr
!= NULL
);
7316 if (! elf_hash_table (info
)->dynamic_sections_created
7319 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
7321 /* This is actually a static link, or it is a
7322 -Bsymbolic link and the symbol is defined
7323 locally. We must initialize this entry in the
7326 When doing a dynamic link, we create a .rela.<xxx>
7327 relocation entry to initialize the value. This
7328 is done in the finish_dynamic_symbol routine. */
7329 if (!linker_section_ptr
->written_address_p
)
7331 linker_section_ptr
->written_address_p
= true;
7332 bfd_put_ptr (output_bfd
,
7333 relocation
+ linker_section_ptr
->addend
,
7334 (lsect
->section
->contents
7335 + linker_section_ptr
->offset
));
7341 /* Handle local symbol. */
7342 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7343 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
7344 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
7345 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7346 (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
7350 BFD_ASSERT (linker_section_ptr
!= NULL
);
7352 /* Write out pointer if it hasn't been rewritten out before. */
7353 if (!linker_section_ptr
->written_address_p
)
7355 linker_section_ptr
->written_address_p
= true;
7356 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
7357 lsect
->section
->contents
+ linker_section_ptr
->offset
);
7361 asection
*srel
= lsect
->rel_section
;
7362 Elf_Internal_Rela
*outrel
;
7363 Elf_External_Rela
*erel
;
7364 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7368 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
7369 outrel
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
7372 (*_bfd_error_handler
) (_("Error: out of memory"));
7376 /* We need to generate a relative reloc for the dynamic
7380 srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
7382 lsect
->rel_section
= srel
;
7385 BFD_ASSERT (srel
!= NULL
);
7387 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7388 outrel
[i
].r_offset
= (lsect
->section
->output_section
->vma
7389 + lsect
->section
->output_offset
7390 + linker_section_ptr
->offset
);
7391 outrel
[0].r_info
= ELF_R_INFO (0, relative_reloc
);
7392 outrel
[0].r_addend
= 0;
7393 erel
= (Elf_External_Rela
*) lsect
->section
->contents
;
7394 erel
+= elf_section_data (lsect
->section
)->rel_count
;
7395 elf_swap_reloca_out (output_bfd
, outrel
, erel
);
7396 ++elf_section_data (lsect
->section
)->rel_count
;
7403 relocation
= (lsect
->section
->output_offset
7404 + linker_section_ptr
->offset
7405 - lsect
->hole_offset
7406 - lsect
->sym_offset
);
7410 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7411 lsect
->name
, (long) relocation
, (long) relocation
);
7414 /* Subtract out the addend, because it will get added back in by the normal
7416 return relocation
- linker_section_ptr
->addend
;
7419 /* Garbage collect unused sections. */
7421 static boolean elf_gc_mark
7422 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
7423 asection
* (*gc_mark_hook
)
7424 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7425 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
7427 static boolean elf_gc_sweep
7428 PARAMS ((struct bfd_link_info
*info
,
7429 boolean (*gc_sweep_hook
)
7430 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
7431 const Elf_Internal_Rela
*relocs
))));
7433 static boolean elf_gc_sweep_symbol
7434 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
7436 static boolean elf_gc_allocate_got_offsets
7437 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
7439 static boolean elf_gc_propagate_vtable_entries_used
7440 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
7442 static boolean elf_gc_smash_unused_vtentry_relocs
7443 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
7445 /* The mark phase of garbage collection. For a given section, mark
7446 it and any sections in this section's group, and all the sections
7447 which define symbols to which it refers. */
7450 elf_gc_mark (info
, sec
, gc_mark_hook
)
7451 struct bfd_link_info
*info
;
7453 asection
* (*gc_mark_hook
)
7454 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7455 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
7458 asection
*group_sec
;
7462 /* Mark all the sections in the group. */
7463 group_sec
= elf_section_data (sec
)->next_in_group
;
7464 if (group_sec
&& !group_sec
->gc_mark
)
7465 if (!elf_gc_mark (info
, group_sec
, gc_mark_hook
))
7468 /* Look through the section relocs. */
7470 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
7472 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
7473 Elf_Internal_Shdr
*symtab_hdr
;
7474 Elf_Internal_Shdr
*shndx_hdr
;
7475 struct elf_link_hash_entry
**sym_hashes
;
7478 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
7479 Elf_External_Sym_Shndx
*locsym_shndx
;
7480 bfd
*input_bfd
= sec
->owner
;
7481 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
7483 /* GCFIXME: how to arrange so that relocs and symbols are not
7484 reread continually? */
7486 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
7487 sym_hashes
= elf_sym_hashes (input_bfd
);
7489 /* Read the local symbols. */
7490 if (elf_bad_symtab (input_bfd
))
7492 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
7496 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
7498 if (symtab_hdr
->contents
)
7499 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
7500 else if (nlocsyms
== 0)
7504 bfd_size_type amt
= nlocsyms
* sizeof (Elf_External_Sym
);
7505 locsyms
= freesyms
= bfd_malloc (amt
);
7506 if (freesyms
== NULL
7507 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
7508 || bfd_bread (locsyms
, amt
, input_bfd
) != amt
)
7515 shndx_hdr
= &elf_tdata (input_bfd
)->symtab_shndx_hdr
;
7516 locsym_shndx
= NULL
;
7517 if (shndx_hdr
->sh_size
!= 0 && nlocsyms
!= 0)
7519 bfd_size_type amt
= nlocsyms
* sizeof (Elf_External_Sym_Shndx
);
7520 locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
7521 if (bfd_seek (input_bfd
, shndx_hdr
->sh_offset
, SEEK_SET
) != 0
7522 || bfd_bread (locsym_shndx
, amt
, input_bfd
) != amt
)
7526 /* Read the relocations. */
7527 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7528 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
7529 info
->keep_memory
));
7530 if (relstart
== NULL
)
7535 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7537 for (rel
= relstart
; rel
< relend
; rel
++)
7539 unsigned long r_symndx
;
7541 struct elf_link_hash_entry
*h
;
7544 r_symndx
= ELF_R_SYM (rel
->r_info
);
7548 if (elf_bad_symtab (sec
->owner
))
7550 elf_swap_symbol_in (input_bfd
,
7552 locsym_shndx
+ (locsym_shndx
? r_symndx
: 0),
7554 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
7555 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, NULL
, &s
);
7558 h
= sym_hashes
[r_symndx
- extsymoff
];
7559 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, h
, NULL
);
7562 else if (r_symndx
>= nlocsyms
)
7564 h
= sym_hashes
[r_symndx
- extsymoff
];
7565 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, h
, NULL
);
7569 elf_swap_symbol_in (input_bfd
,
7571 locsym_shndx
+ (locsym_shndx
? r_symndx
: 0),
7573 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, NULL
, &s
);
7576 if (rsec
&& !rsec
->gc_mark
)
7577 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
7585 if (!info
->keep_memory
)
7595 /* The sweep phase of garbage collection. Remove all garbage sections. */
7598 elf_gc_sweep (info
, gc_sweep_hook
)
7599 struct bfd_link_info
*info
;
7600 boolean (*gc_sweep_hook
)
7601 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
7602 const Elf_Internal_Rela
*relocs
));
7606 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7610 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
7613 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7615 /* Keep special sections. Keep .debug sections. */
7616 if ((o
->flags
& SEC_LINKER_CREATED
)
7617 || (o
->flags
& SEC_DEBUGGING
))
7623 /* Skip sweeping sections already excluded. */
7624 if (o
->flags
& SEC_EXCLUDE
)
7627 /* Since this is early in the link process, it is simple
7628 to remove a section from the output. */
7629 o
->flags
|= SEC_EXCLUDE
;
7631 /* But we also have to update some of the relocation
7632 info we collected before. */
7634 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
7636 Elf_Internal_Rela
*internal_relocs
;
7639 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
7640 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
7641 if (internal_relocs
== NULL
)
7644 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
7646 if (!info
->keep_memory
)
7647 free (internal_relocs
);
7655 /* Remove the symbols that were in the swept sections from the dynamic
7656 symbol table. GCFIXME: Anyone know how to get them out of the
7657 static symbol table as well? */
7661 elf_link_hash_traverse (elf_hash_table (info
),
7662 elf_gc_sweep_symbol
,
7665 elf_hash_table (info
)->dynsymcount
= i
;
7671 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7674 elf_gc_sweep_symbol (h
, idxptr
)
7675 struct elf_link_hash_entry
*h
;
7678 int *idx
= (int *) idxptr
;
7680 if (h
->dynindx
!= -1
7681 && ((h
->root
.type
!= bfd_link_hash_defined
7682 && h
->root
.type
!= bfd_link_hash_defweak
)
7683 || h
->root
.u
.def
.section
->gc_mark
))
7684 h
->dynindx
= (*idx
)++;
7689 /* Propogate collected vtable information. This is called through
7690 elf_link_hash_traverse. */
7693 elf_gc_propagate_vtable_entries_used (h
, okp
)
7694 struct elf_link_hash_entry
*h
;
7697 /* Those that are not vtables. */
7698 if (h
->vtable_parent
== NULL
)
7701 /* Those vtables that do not have parents, we cannot merge. */
7702 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
7705 /* If we've already been done, exit. */
7706 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
7709 /* Make sure the parent's table is up to date. */
7710 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
7712 if (h
->vtable_entries_used
== NULL
)
7714 /* None of this table's entries were referenced. Re-use the
7716 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
7717 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
7724 /* Or the parent's entries into ours. */
7725 cu
= h
->vtable_entries_used
;
7727 pu
= h
->vtable_parent
->vtable_entries_used
;
7730 asection
*sec
= h
->root
.u
.def
.section
;
7731 struct elf_backend_data
*bed
= get_elf_backend_data (sec
->owner
);
7732 int file_align
= bed
->s
->file_align
;
7734 n
= h
->vtable_parent
->vtable_entries_size
/ file_align
;
7749 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
7750 struct elf_link_hash_entry
*h
;
7754 bfd_vma hstart
, hend
;
7755 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
7756 struct elf_backend_data
*bed
;
7759 /* Take care of both those symbols that do not describe vtables as
7760 well as those that are not loaded. */
7761 if (h
->vtable_parent
== NULL
)
7764 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
7765 || h
->root
.type
== bfd_link_hash_defweak
);
7767 sec
= h
->root
.u
.def
.section
;
7768 hstart
= h
->root
.u
.def
.value
;
7769 hend
= hstart
+ h
->size
;
7771 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7772 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
7774 return *(boolean
*) okp
= false;
7775 bed
= get_elf_backend_data (sec
->owner
);
7776 file_align
= bed
->s
->file_align
;
7778 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7780 for (rel
= relstart
; rel
< relend
; ++rel
)
7781 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
7783 /* If the entry is in use, do nothing. */
7784 if (h
->vtable_entries_used
7785 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
7787 bfd_vma entry
= (rel
->r_offset
- hstart
) / file_align
;
7788 if (h
->vtable_entries_used
[entry
])
7791 /* Otherwise, kill it. */
7792 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
7798 /* Do mark and sweep of unused sections. */
7801 elf_gc_sections (abfd
, info
)
7803 struct bfd_link_info
*info
;
7807 asection
* (*gc_mark_hook
)
7808 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7809 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
7811 if (!get_elf_backend_data (abfd
)->can_gc_sections
7812 || info
->relocateable
|| info
->emitrelocations
7813 || elf_hash_table (info
)->dynamic_sections_created
)
7816 /* Apply transitive closure to the vtable entry usage info. */
7817 elf_link_hash_traverse (elf_hash_table (info
),
7818 elf_gc_propagate_vtable_entries_used
,
7823 /* Kill the vtable relocations that were not used. */
7824 elf_link_hash_traverse (elf_hash_table (info
),
7825 elf_gc_smash_unused_vtentry_relocs
,
7830 /* Grovel through relocs to find out who stays ... */
7832 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
7833 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7837 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
7840 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7842 if (o
->flags
& SEC_KEEP
)
7843 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
7848 /* ... and mark SEC_EXCLUDE for those that go. */
7849 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
7855 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
7858 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
7861 struct elf_link_hash_entry
*h
;
7864 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
7865 struct elf_link_hash_entry
**search
, *child
;
7866 bfd_size_type extsymcount
;
7868 /* The sh_info field of the symtab header tells us where the
7869 external symbols start. We don't care about the local symbols at
7871 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
7872 if (!elf_bad_symtab (abfd
))
7873 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
7875 sym_hashes
= elf_sym_hashes (abfd
);
7876 sym_hashes_end
= sym_hashes
+ extsymcount
;
7878 /* Hunt down the child symbol, which is in this section at the same
7879 offset as the relocation. */
7880 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
7882 if ((child
= *search
) != NULL
7883 && (child
->root
.type
== bfd_link_hash_defined
7884 || child
->root
.type
== bfd_link_hash_defweak
)
7885 && child
->root
.u
.def
.section
== sec
7886 && child
->root
.u
.def
.value
== offset
)
7890 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
7891 bfd_archive_filename (abfd
), sec
->name
,
7892 (unsigned long) offset
);
7893 bfd_set_error (bfd_error_invalid_operation
);
7899 /* This *should* only be the absolute section. It could potentially
7900 be that someone has defined a non-global vtable though, which
7901 would be bad. It isn't worth paging in the local symbols to be
7902 sure though; that case should simply be handled by the assembler. */
7904 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
7907 child
->vtable_parent
= h
;
7912 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
7915 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
7916 bfd
*abfd ATTRIBUTE_UNUSED
;
7917 asection
*sec ATTRIBUTE_UNUSED
;
7918 struct elf_link_hash_entry
*h
;
7921 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7922 int file_align
= bed
->s
->file_align
;
7924 if (addend
>= h
->vtable_entries_size
)
7927 boolean
*ptr
= h
->vtable_entries_used
;
7929 /* While the symbol is undefined, we have to be prepared to handle
7931 if (h
->root
.type
== bfd_link_hash_undefined
)
7938 /* Oops! We've got a reference past the defined end of
7939 the table. This is probably a bug -- shall we warn? */
7944 /* Allocate one extra entry for use as a "done" flag for the
7945 consolidation pass. */
7946 bytes
= (size
/ file_align
+ 1) * sizeof (boolean
);
7950 ptr
= bfd_realloc (ptr
- 1, (bfd_size_type
) bytes
);
7956 oldbytes
= ((h
->vtable_entries_size
/ file_align
+ 1)
7957 * sizeof (boolean
));
7958 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
7962 ptr
= bfd_zmalloc ((bfd_size_type
) bytes
);
7967 /* And arrange for that done flag to be at index -1. */
7968 h
->vtable_entries_used
= ptr
+ 1;
7969 h
->vtable_entries_size
= size
;
7972 h
->vtable_entries_used
[addend
/ file_align
] = true;
7977 /* And an accompanying bit to work out final got entry offsets once
7978 we're done. Should be called from final_link. */
7981 elf_gc_common_finalize_got_offsets (abfd
, info
)
7983 struct bfd_link_info
*info
;
7986 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7989 /* The GOT offset is relative to the .got section, but the GOT header is
7990 put into the .got.plt section, if the backend uses it. */
7991 if (bed
->want_got_plt
)
7994 gotoff
= bed
->got_header_size
;
7996 /* Do the local .got entries first. */
7997 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
7999 bfd_signed_vma
*local_got
;
8000 bfd_size_type j
, locsymcount
;
8001 Elf_Internal_Shdr
*symtab_hdr
;
8003 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
8006 local_got
= elf_local_got_refcounts (i
);
8010 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
8011 if (elf_bad_symtab (i
))
8012 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8014 locsymcount
= symtab_hdr
->sh_info
;
8016 for (j
= 0; j
< locsymcount
; ++j
)
8018 if (local_got
[j
] > 0)
8020 local_got
[j
] = gotoff
;
8021 gotoff
+= ARCH_SIZE
/ 8;
8024 local_got
[j
] = (bfd_vma
) -1;
8028 /* Then the global .got entries. .plt refcounts are handled by
8029 adjust_dynamic_symbol */
8030 elf_link_hash_traverse (elf_hash_table (info
),
8031 elf_gc_allocate_got_offsets
,
8036 /* We need a special top-level link routine to convert got reference counts
8037 to real got offsets. */
8040 elf_gc_allocate_got_offsets (h
, offarg
)
8041 struct elf_link_hash_entry
*h
;
8044 bfd_vma
*off
= (bfd_vma
*) offarg
;
8046 if (h
->got
.refcount
> 0)
8048 h
->got
.offset
= off
[0];
8049 off
[0] += ARCH_SIZE
/ 8;
8052 h
->got
.offset
= (bfd_vma
) -1;
8057 /* Many folk need no more in the way of final link than this, once
8058 got entry reference counting is enabled. */
8061 elf_gc_common_final_link (abfd
, info
)
8063 struct bfd_link_info
*info
;
8065 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
8068 /* Invoke the regular ELF backend linker to do all the work. */
8069 return elf_bfd_final_link (abfd
, info
);
8072 /* This function will be called though elf_link_hash_traverse to store
8073 all hash value of the exported symbols in an array. */
8076 elf_collect_hash_codes (h
, data
)
8077 struct elf_link_hash_entry
*h
;
8080 unsigned long **valuep
= (unsigned long **) data
;
8086 /* Ignore indirect symbols. These are added by the versioning code. */
8087 if (h
->dynindx
== -1)
8090 name
= h
->root
.root
.string
;
8091 p
= strchr (name
, ELF_VER_CHR
);
8094 alc
= bfd_malloc ((bfd_size_type
) (p
- name
+ 1));
8095 memcpy (alc
, name
, (size_t) (p
- name
));
8096 alc
[p
- name
] = '\0';
8100 /* Compute the hash value. */
8101 ha
= bfd_elf_hash (name
);
8103 /* Store the found hash value in the array given as the argument. */
8106 /* And store it in the struct so that we can put it in the hash table
8108 h
->elf_hash_value
= ha
;
8117 elf_reloc_symbol_deleted_p (offset
, cookie
)
8121 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
8123 if (rcookie
->bad_symtab
)
8124 rcookie
->rel
= rcookie
->rels
;
8126 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
8128 unsigned long r_symndx
= ELF_R_SYM (rcookie
->rel
->r_info
);
8129 Elf_Internal_Sym isym
;
8131 if (! rcookie
->bad_symtab
)
8132 if (rcookie
->rel
->r_offset
> offset
)
8134 if (rcookie
->rel
->r_offset
!= offset
)
8137 if (rcookie
->locsyms
&& r_symndx
< rcookie
->locsymcount
)
8139 Elf_External_Sym
*lsym
;
8140 Elf_External_Sym_Shndx
*lshndx
;
8142 lsym
= (Elf_External_Sym
*) rcookie
->locsyms
+ r_symndx
;
8143 lshndx
= (Elf_External_Sym_Shndx
*) rcookie
->locsym_shndx
;
8146 elf_swap_symbol_in (rcookie
->abfd
, lsym
, lshndx
, &isym
);
8149 if (r_symndx
>= rcookie
->locsymcount
8150 || (rcookie
->locsyms
8151 && ELF_ST_BIND (isym
.st_info
) != STB_LOCAL
))
8153 struct elf_link_hash_entry
*h
;
8155 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
8157 while (h
->root
.type
== bfd_link_hash_indirect
8158 || h
->root
.type
== bfd_link_hash_warning
)
8159 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8161 if ((h
->root
.type
== bfd_link_hash_defined
8162 || h
->root
.type
== bfd_link_hash_defweak
)
8163 && elf_discarded_section (h
->root
.u
.def
.section
))
8168 else if (rcookie
->locsyms
)
8170 /* It's not a relocation against a global symbol,
8171 but it could be a relocation against a local
8172 symbol for a discarded section. */
8175 /* Need to: get the symbol; get the section. */
8176 if (isym
.st_shndx
< SHN_LORESERVE
|| isym
.st_shndx
> SHN_HIRESERVE
)
8178 isec
= section_from_elf_index (rcookie
->abfd
, isym
.st_shndx
);
8179 if (isec
!= NULL
&& elf_discarded_section (isec
))
8188 /* Discard unneeded references to discarded sections.
8189 Returns true if any section's size was changed. */
8190 /* This function assumes that the relocations are in sorted order,
8191 which is true for all known assemblers. */
8194 elf_bfd_discard_info (output_bfd
, info
)
8196 struct bfd_link_info
*info
;
8198 struct elf_reloc_cookie cookie
;
8199 asection
*stab
, *eh
, *ehdr
;
8200 Elf_Internal_Shdr
*symtab_hdr
;
8201 Elf_Internal_Shdr
*shndx_hdr
;
8202 Elf_External_Sym
*freesyms
;
8203 struct elf_backend_data
*bed
;
8205 boolean ret
= false;
8206 boolean strip
= info
->strip
== strip_all
|| info
->strip
== strip_debugger
;
8208 if (info
->relocateable
8209 || info
->traditional_format
8210 || info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
8211 || ! is_elf_hash_table (info
))
8215 if (elf_hash_table (info
)->dynobj
!= NULL
)
8216 ehdr
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
8219 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
8221 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
8224 bed
= get_elf_backend_data (abfd
);
8226 if ((abfd
->flags
& DYNAMIC
) != 0)
8232 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
8233 if (eh
&& eh
->_raw_size
== 0)
8237 stab
= strip
? NULL
: bfd_get_section_by_name (abfd
, ".stab");
8239 || elf_section_data(stab
)->sec_info_type
!= ELF_INFO_TYPE_STABS
)
8241 && (strip
|| ! bed
->elf_backend_discard_info
))
8244 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8245 shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
8248 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
8249 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
8250 if (cookie
.bad_symtab
)
8252 cookie
.locsymcount
=
8253 symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8254 cookie
.extsymoff
= 0;
8258 cookie
.locsymcount
= symtab_hdr
->sh_info
;
8259 cookie
.extsymoff
= symtab_hdr
->sh_info
;
8263 if (symtab_hdr
->contents
)
8264 cookie
.locsyms
= (void *) symtab_hdr
->contents
;
8265 else if (cookie
.locsymcount
== 0)
8266 cookie
.locsyms
= NULL
;
8269 bfd_size_type amt
= cookie
.locsymcount
* sizeof (Elf_External_Sym
);
8270 cookie
.locsyms
= bfd_malloc (amt
);
8271 if (cookie
.locsyms
== NULL
)
8273 freesyms
= cookie
.locsyms
;
8274 if (bfd_seek (abfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
8275 || bfd_bread (cookie
.locsyms
, amt
, abfd
) != amt
)
8278 free (cookie
.locsyms
);
8283 cookie
.locsym_shndx
= NULL
;
8284 if (shndx_hdr
->sh_size
!= 0 && cookie
.locsymcount
!= 0)
8287 amt
= cookie
.locsymcount
* sizeof (Elf_External_Sym_Shndx
);
8288 cookie
.locsym_shndx
= bfd_malloc (amt
);
8289 if (cookie
.locsym_shndx
== NULL
)
8290 goto error_ret_free_loc
;
8291 if (bfd_seek (abfd
, shndx_hdr
->sh_offset
, SEEK_SET
) != 0
8292 || bfd_bread (cookie
.locsym_shndx
, amt
, abfd
) != amt
)
8294 free (cookie
.locsym_shndx
);
8295 goto error_ret_free_loc
;
8301 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8302 (abfd
, stab
, (PTR
) NULL
,
8303 (Elf_Internal_Rela
*) NULL
,
8304 info
->keep_memory
));
8307 cookie
.rel
= cookie
.rels
;
8309 cookie
.rels
+ stab
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8310 if (_bfd_discard_section_stabs (abfd
, stab
,
8311 elf_section_data (stab
)->sec_info
,
8312 elf_reloc_symbol_deleted_p
,
8315 if (! info
->keep_memory
)
8324 cookie
.relend
= NULL
;
8325 if (eh
->reloc_count
)
8326 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8327 (abfd
, eh
, (PTR
) NULL
, (Elf_Internal_Rela
*) NULL
,
8328 info
->keep_memory
));
8331 cookie
.rel
= cookie
.rels
;
8333 cookie
.rels
+ eh
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8335 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
, ehdr
,
8336 elf_reloc_symbol_deleted_p
,
8339 if (! info
->keep_memory
)
8343 if (bed
->elf_backend_discard_info
)
8345 if (bed
->elf_backend_discard_info (abfd
, &cookie
, info
))
8349 if (cookie
.locsym_shndx
!= NULL
)
8350 free (cookie
.locsym_shndx
);
8352 if (freesyms
!= NULL
)
8356 if (ehdr
&& _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
, ehdr
))
8362 elf_section_ignore_discarded_relocs (sec
)
8365 struct elf_backend_data
*bed
;
8367 switch (elf_section_data (sec
)->sec_info_type
)
8369 case ELF_INFO_TYPE_STABS
:
8370 case ELF_INFO_TYPE_EH_FRAME
:
8376 bed
= get_elf_backend_data (sec
->owner
);
8377 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
8378 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))