2 Copyright 1995, 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info
*info
;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd
*, struct bfd_link_info
*));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd
*, struct bfd_link_info
*));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
37 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
38 boolean
*, boolean
*, boolean
*, boolean
));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry
*, PTR
));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry
*, PTR
));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry
*, PTR
));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry
*, PTR
));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry
*, PTR
));
51 static boolean elf_collect_hash_codes
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
53 static boolean elf_link_read_relocs_from_section
54 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
55 static void elf_link_output_relocs
56 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
57 static boolean elf_link_size_reloc_section
58 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
59 static void elf_link_adjust_relocs
60 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
61 struct elf_link_hash_entry
**));
63 /* Given an ELF BFD, add symbols to the global hash table as
67 elf_bfd_link_add_symbols (abfd
, info
)
69 struct bfd_link_info
*info
;
71 switch (bfd_get_format (abfd
))
74 return elf_link_add_object_symbols (abfd
, info
);
76 return elf_link_add_archive_symbols (abfd
, info
);
78 bfd_set_error (bfd_error_wrong_format
);
83 /* Return true iff this is a non-common definition of a symbol. */
85 is_global_symbol_definition (abfd
, sym
)
86 bfd
* abfd ATTRIBUTE_UNUSED
;
87 Elf_Internal_Sym
* sym
;
89 /* Local symbols do not count, but target specific ones might. */
90 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
91 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
94 /* If the section is undefined, then so is the symbol. */
95 if (sym
->st_shndx
== SHN_UNDEF
)
98 /* If the symbol is defined in the common section, then
99 it is a common definition and so does not count. */
100 if (sym
->st_shndx
== SHN_COMMON
)
103 /* If the symbol is in a target specific section then we
104 must rely upon the backend to tell us what it is. */
105 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
106 /* FIXME - this function is not coded yet:
108 return _bfd_is_global_symbol_definition (abfd, sym);
110 Instead for now assume that the definition is not global,
111 Even if this is wrong, at least the linker will behave
112 in the same way that it used to do. */
119 /* Search the symbol table of the archive element of the archive ABFD
120 whoes archove map contains a mention of SYMDEF, and determine if
121 the symbol is defined in this element. */
123 elf_link_is_defined_archive_symbol (abfd
, symdef
)
127 Elf_Internal_Shdr
* hdr
;
128 Elf_External_Sym
* esym
;
129 Elf_External_Sym
* esymend
;
130 Elf_External_Sym
* buf
= NULL
;
134 boolean result
= false;
136 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
137 if (abfd
== (bfd
*) NULL
)
140 if (! bfd_check_format (abfd
, bfd_object
))
143 /* If we have already included the element containing this symbol in the
144 link then we do not need to include it again. Just claim that any symbol
145 it contains is not a definition, so that our caller will not decide to
146 (re)include this element. */
147 if (abfd
->archive_pass
)
150 /* Select the appropriate symbol table. */
151 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
152 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
154 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
156 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
158 /* The sh_info field of the symtab header tells us where the
159 external symbols start. We don't care about the local symbols. */
160 if (elf_bad_symtab (abfd
))
162 extsymcount
= symcount
;
167 extsymcount
= symcount
- hdr
->sh_info
;
168 extsymoff
= hdr
->sh_info
;
171 buf
= ((Elf_External_Sym
*)
172 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
173 if (buf
== NULL
&& extsymcount
!= 0)
176 /* Read in the symbol table.
177 FIXME: This ought to be cached somewhere. */
179 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
181 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
182 != extsymcount
* sizeof (Elf_External_Sym
)))
188 /* Scan the symbol table looking for SYMDEF. */
189 esymend
= buf
+ extsymcount
;
194 Elf_Internal_Sym sym
;
197 elf_swap_symbol_in (abfd
, esym
, & sym
);
199 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
200 if (name
== (const char *) NULL
)
203 if (strcmp (name
, symdef
->name
) == 0)
205 result
= is_global_symbol_definition (abfd
, & sym
);
216 /* Add symbols from an ELF archive file to the linker hash table. We
217 don't use _bfd_generic_link_add_archive_symbols because of a
218 problem which arises on UnixWare. The UnixWare libc.so is an
219 archive which includes an entry libc.so.1 which defines a bunch of
220 symbols. The libc.so archive also includes a number of other
221 object files, which also define symbols, some of which are the same
222 as those defined in libc.so.1. Correct linking requires that we
223 consider each object file in turn, and include it if it defines any
224 symbols we need. _bfd_generic_link_add_archive_symbols does not do
225 this; it looks through the list of undefined symbols, and includes
226 any object file which defines them. When this algorithm is used on
227 UnixWare, it winds up pulling in libc.so.1 early and defining a
228 bunch of symbols. This means that some of the other objects in the
229 archive are not included in the link, which is incorrect since they
230 precede libc.so.1 in the archive.
232 Fortunately, ELF archive handling is simpler than that done by
233 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
234 oddities. In ELF, if we find a symbol in the archive map, and the
235 symbol is currently undefined, we know that we must pull in that
238 Unfortunately, we do have to make multiple passes over the symbol
239 table until nothing further is resolved. */
242 elf_link_add_archive_symbols (abfd
, info
)
244 struct bfd_link_info
*info
;
247 boolean
*defined
= NULL
;
248 boolean
*included
= NULL
;
252 if (! bfd_has_map (abfd
))
254 /* An empty archive is a special case. */
255 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
257 bfd_set_error (bfd_error_no_armap
);
261 /* Keep track of all symbols we know to be already defined, and all
262 files we know to be already included. This is to speed up the
263 second and subsequent passes. */
264 c
= bfd_ardata (abfd
)->symdef_count
;
267 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
268 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
269 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
271 memset (defined
, 0, c
* sizeof (boolean
));
272 memset (included
, 0, c
* sizeof (boolean
));
274 symdefs
= bfd_ardata (abfd
)->symdefs
;
287 symdefend
= symdef
+ c
;
288 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
290 struct elf_link_hash_entry
*h
;
292 struct bfd_link_hash_entry
*undefs_tail
;
295 if (defined
[i
] || included
[i
])
297 if (symdef
->file_offset
== last
)
303 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
304 false, false, false);
310 /* If this is a default version (the name contains @@),
311 look up the symbol again without the version. The
312 effect is that references to the symbol without the
313 version will be matched by the default symbol in the
316 p
= strchr (symdef
->name
, ELF_VER_CHR
);
317 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
320 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
323 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
324 copy
[p
- symdef
->name
] = '\0';
326 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
327 false, false, false);
329 bfd_release (abfd
, copy
);
335 if (h
->root
.type
== bfd_link_hash_common
)
337 /* We currently have a common symbol. The archive map contains
338 a reference to this symbol, so we may want to include it. We
339 only want to include it however, if this archive element
340 contains a definition of the symbol, not just another common
343 Unfortunately some archivers (including GNU ar) will put
344 declarations of common symbols into their archive maps, as
345 well as real definitions, so we cannot just go by the archive
346 map alone. Instead we must read in the element's symbol
347 table and check that to see what kind of symbol definition
349 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
352 else if (h
->root
.type
!= bfd_link_hash_undefined
)
354 if (h
->root
.type
!= bfd_link_hash_undefweak
)
359 /* We need to include this archive member. */
360 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
361 if (element
== (bfd
*) NULL
)
364 if (! bfd_check_format (element
, bfd_object
))
367 /* Doublecheck that we have not included this object
368 already--it should be impossible, but there may be
369 something wrong with the archive. */
370 if (element
->archive_pass
!= 0)
372 bfd_set_error (bfd_error_bad_value
);
375 element
->archive_pass
= 1;
377 undefs_tail
= info
->hash
->undefs_tail
;
379 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
382 if (! elf_link_add_object_symbols (element
, info
))
385 /* If there are any new undefined symbols, we need to make
386 another pass through the archive in order to see whether
387 they can be defined. FIXME: This isn't perfect, because
388 common symbols wind up on undefs_tail and because an
389 undefined symbol which is defined later on in this pass
390 does not require another pass. This isn't a bug, but it
391 does make the code less efficient than it could be. */
392 if (undefs_tail
!= info
->hash
->undefs_tail
)
395 /* Look backward to mark all symbols from this object file
396 which we have already seen in this pass. */
400 included
[mark
] = true;
405 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
407 /* We mark subsequent symbols from this object file as we go
408 on through the loop. */
409 last
= symdef
->file_offset
;
420 if (defined
!= (boolean
*) NULL
)
422 if (included
!= (boolean
*) NULL
)
427 /* This function is called when we want to define a new symbol. It
428 handles the various cases which arise when we find a definition in
429 a dynamic object, or when there is already a definition in a
430 dynamic object. The new symbol is described by NAME, SYM, PSEC,
431 and PVALUE. We set SYM_HASH to the hash table entry. We set
432 OVERRIDE if the old symbol is overriding a new definition. We set
433 TYPE_CHANGE_OK if it is OK for the type to change. We set
434 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
435 change, we mean that we shouldn't warn if the type or size does
436 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
440 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
441 override
, type_change_ok
, size_change_ok
, dt_needed
)
443 struct bfd_link_info
*info
;
445 Elf_Internal_Sym
*sym
;
448 struct elf_link_hash_entry
**sym_hash
;
450 boolean
*type_change_ok
;
451 boolean
*size_change_ok
;
455 struct elf_link_hash_entry
*h
;
458 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
463 bind
= ELF_ST_BIND (sym
->st_info
);
465 if (! bfd_is_und_section (sec
))
466 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
468 h
= ((struct elf_link_hash_entry
*)
469 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
474 /* This code is for coping with dynamic objects, and is only useful
475 if we are doing an ELF link. */
476 if (info
->hash
->creator
!= abfd
->xvec
)
479 /* For merging, we only care about real symbols. */
481 while (h
->root
.type
== bfd_link_hash_indirect
482 || h
->root
.type
== bfd_link_hash_warning
)
483 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
485 /* If we just created the symbol, mark it as being an ELF symbol.
486 Other than that, there is nothing to do--there is no merge issue
487 with a newly defined symbol--so we just return. */
489 if (h
->root
.type
== bfd_link_hash_new
)
491 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
495 /* OLDBFD is a BFD associated with the existing symbol. */
497 switch (h
->root
.type
)
503 case bfd_link_hash_undefined
:
504 case bfd_link_hash_undefweak
:
505 oldbfd
= h
->root
.u
.undef
.abfd
;
508 case bfd_link_hash_defined
:
509 case bfd_link_hash_defweak
:
510 oldbfd
= h
->root
.u
.def
.section
->owner
;
513 case bfd_link_hash_common
:
514 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
518 /* In cases involving weak versioned symbols, we may wind up trying
519 to merge a symbol with itself. Catch that here, to avoid the
520 confusion that results if we try to override a symbol with
521 itself. The additional tests catch cases like
522 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
523 dynamic object, which we do want to handle here. */
525 && ((abfd
->flags
& DYNAMIC
) == 0
526 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
529 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
530 respectively, is from a dynamic object. */
532 if ((abfd
->flags
& DYNAMIC
) != 0)
538 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
543 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
544 indices used by MIPS ELF. */
545 switch (h
->root
.type
)
551 case bfd_link_hash_defined
:
552 case bfd_link_hash_defweak
:
553 hsec
= h
->root
.u
.def
.section
;
556 case bfd_link_hash_common
:
557 hsec
= h
->root
.u
.c
.p
->section
;
564 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
567 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
568 respectively, appear to be a definition rather than reference. */
570 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
575 if (h
->root
.type
== bfd_link_hash_undefined
576 || h
->root
.type
== bfd_link_hash_undefweak
577 || h
->root
.type
== bfd_link_hash_common
)
582 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
583 symbol, respectively, appears to be a common symbol in a dynamic
584 object. If a symbol appears in an uninitialized section, and is
585 not weak, and is not a function, then it may be a common symbol
586 which was resolved when the dynamic object was created. We want
587 to treat such symbols specially, because they raise special
588 considerations when setting the symbol size: if the symbol
589 appears as a common symbol in a regular object, and the size in
590 the regular object is larger, we must make sure that we use the
591 larger size. This problematic case can always be avoided in C,
592 but it must be handled correctly when using Fortran shared
595 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
596 likewise for OLDDYNCOMMON and OLDDEF.
598 Note that this test is just a heuristic, and that it is quite
599 possible to have an uninitialized symbol in a shared object which
600 is really a definition, rather than a common symbol. This could
601 lead to some minor confusion when the symbol really is a common
602 symbol in some regular object. However, I think it will be
607 && (sec
->flags
& SEC_ALLOC
) != 0
608 && (sec
->flags
& SEC_LOAD
) == 0
611 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
614 newdyncommon
= false;
618 && h
->root
.type
== bfd_link_hash_defined
619 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
620 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
621 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
623 && h
->type
!= STT_FUNC
)
626 olddyncommon
= false;
628 /* It's OK to change the type if either the existing symbol or the
629 new symbol is weak unless it comes from a DT_NEEDED entry of
630 a shared object, in which case, the DT_NEEDED entry may not be
631 required at the run time. */
633 if ((! dt_needed
&& h
->root
.type
== bfd_link_hash_defweak
)
634 || h
->root
.type
== bfd_link_hash_undefweak
636 *type_change_ok
= true;
638 /* It's OK to change the size if either the existing symbol or the
639 new symbol is weak, or if the old symbol is undefined. */
642 || h
->root
.type
== bfd_link_hash_undefined
)
643 *size_change_ok
= true;
645 /* If both the old and the new symbols look like common symbols in a
646 dynamic object, set the size of the symbol to the larger of the
651 && sym
->st_size
!= h
->size
)
653 /* Since we think we have two common symbols, issue a multiple
654 common warning if desired. Note that we only warn if the
655 size is different. If the size is the same, we simply let
656 the old symbol override the new one as normally happens with
657 symbols defined in dynamic objects. */
659 if (! ((*info
->callbacks
->multiple_common
)
660 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
661 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
664 if (sym
->st_size
> h
->size
)
665 h
->size
= sym
->st_size
;
667 *size_change_ok
= true;
670 /* If we are looking at a dynamic object, and we have found a
671 definition, we need to see if the symbol was already defined by
672 some other object. If so, we want to use the existing
673 definition, and we do not want to report a multiple symbol
674 definition error; we do this by clobbering *PSEC to be
677 We treat a common symbol as a definition if the symbol in the
678 shared library is a function, since common symbols always
679 represent variables; this can cause confusion in principle, but
680 any such confusion would seem to indicate an erroneous program or
681 shared library. We also permit a common symbol in a regular
682 object to override a weak symbol in a shared object.
684 We prefer a non-weak definition in a shared library to a weak
685 definition in the executable unless it comes from a DT_NEEDED
686 entry of a shared object, in which case, the DT_NEEDED entry
687 may not be required at the run time. */
692 || (h
->root
.type
== bfd_link_hash_common
694 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
695 && (h
->root
.type
!= bfd_link_hash_defweak
697 || bind
== STB_WEAK
))
701 newdyncommon
= false;
703 *psec
= sec
= bfd_und_section_ptr
;
704 *size_change_ok
= true;
706 /* If we get here when the old symbol is a common symbol, then
707 we are explicitly letting it override a weak symbol or
708 function in a dynamic object, and we don't want to warn about
709 a type change. If the old symbol is a defined symbol, a type
710 change warning may still be appropriate. */
712 if (h
->root
.type
== bfd_link_hash_common
)
713 *type_change_ok
= true;
716 /* Handle the special case of an old common symbol merging with a
717 new symbol which looks like a common symbol in a shared object.
718 We change *PSEC and *PVALUE to make the new symbol look like a
719 common symbol, and let _bfd_generic_link_add_one_symbol will do
723 && h
->root
.type
== bfd_link_hash_common
)
727 newdyncommon
= false;
728 *pvalue
= sym
->st_size
;
729 *psec
= sec
= bfd_com_section_ptr
;
730 *size_change_ok
= true;
733 /* If the old symbol is from a dynamic object, and the new symbol is
734 a definition which is not from a dynamic object, then the new
735 symbol overrides the old symbol. Symbols from regular files
736 always take precedence over symbols from dynamic objects, even if
737 they are defined after the dynamic object in the link.
739 As above, we again permit a common symbol in a regular object to
740 override a definition in a shared object if the shared object
741 symbol is a function or is weak.
743 As above, we permit a non-weak definition in a shared object to
744 override a weak definition in a regular object. */
748 || (bfd_is_com_section (sec
)
749 && (h
->root
.type
== bfd_link_hash_defweak
750 || h
->type
== STT_FUNC
)))
753 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
755 || h
->root
.type
== bfd_link_hash_defweak
))
757 /* Change the hash table entry to undefined, and let
758 _bfd_generic_link_add_one_symbol do the right thing with the
761 h
->root
.type
= bfd_link_hash_undefined
;
762 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
763 *size_change_ok
= true;
766 olddyncommon
= false;
768 /* We again permit a type change when a common symbol may be
769 overriding a function. */
771 if (bfd_is_com_section (sec
))
772 *type_change_ok
= true;
774 /* This union may have been set to be non-NULL when this symbol
775 was seen in a dynamic object. We must force the union to be
776 NULL, so that it is correct for a regular symbol. */
778 h
->verinfo
.vertree
= NULL
;
780 /* In this special case, if H is the target of an indirection,
781 we want the caller to frob with H rather than with the
782 indirect symbol. That will permit the caller to redefine the
783 target of the indirection, rather than the indirect symbol
784 itself. FIXME: This will break the -y option if we store a
785 symbol with a different name. */
789 /* Handle the special case of a new common symbol merging with an
790 old symbol that looks like it might be a common symbol defined in
791 a shared object. Note that we have already handled the case in
792 which a new common symbol should simply override the definition
793 in the shared library. */
796 && bfd_is_com_section (sec
)
799 /* It would be best if we could set the hash table entry to a
800 common symbol, but we don't know what to use for the section
802 if (! ((*info
->callbacks
->multiple_common
)
803 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
804 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
807 /* If the predumed common symbol in the dynamic object is
808 larger, pretend that the new symbol has its size. */
810 if (h
->size
> *pvalue
)
813 /* FIXME: We no longer know the alignment required by the symbol
814 in the dynamic object, so we just wind up using the one from
815 the regular object. */
818 olddyncommon
= false;
820 h
->root
.type
= bfd_link_hash_undefined
;
821 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
823 *size_change_ok
= true;
824 *type_change_ok
= true;
826 h
->verinfo
.vertree
= NULL
;
829 /* Handle the special case of a weak definition in a regular object
830 followed by a non-weak definition in a shared object. In this
831 case, we prefer the definition in the shared object unless it
832 comes from a DT_NEEDED entry of a shared object, in which case,
833 the DT_NEEDED entry may not be required at the run time. */
836 && h
->root
.type
== bfd_link_hash_defweak
841 /* To make this work we have to frob the flags so that the rest
842 of the code does not think we are using the regular
844 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
845 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
846 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
847 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
848 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
849 | ELF_LINK_HASH_DEF_DYNAMIC
);
851 /* If H is the target of an indirection, we want the caller to
852 use H rather than the indirect symbol. Otherwise if we are
853 defining a new indirect symbol we will wind up attaching it
854 to the entry we are overriding. */
858 /* Handle the special case of a non-weak definition in a shared
859 object followed by a weak definition in a regular object. In
860 this case we prefer to definition in the shared object. To make
861 this work we have to tell the caller to not treat the new symbol
865 && h
->root
.type
!= bfd_link_hash_defweak
874 /* Add symbols from an ELF object file to the linker hash table. */
877 elf_link_add_object_symbols (abfd
, info
)
879 struct bfd_link_info
*info
;
881 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
882 const Elf_Internal_Sym
*,
883 const char **, flagword
*,
884 asection
**, bfd_vma
*));
885 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
886 asection
*, const Elf_Internal_Rela
*));
888 Elf_Internal_Shdr
*hdr
;
892 Elf_External_Sym
*buf
= NULL
;
893 struct elf_link_hash_entry
**sym_hash
;
895 bfd_byte
*dynver
= NULL
;
896 Elf_External_Versym
*extversym
= NULL
;
897 Elf_External_Versym
*ever
;
898 Elf_External_Dyn
*dynbuf
= NULL
;
899 struct elf_link_hash_entry
*weaks
;
900 Elf_External_Sym
*esym
;
901 Elf_External_Sym
*esymend
;
902 struct elf_backend_data
*bed
;
905 bed
= get_elf_backend_data (abfd
);
906 add_symbol_hook
= bed
->elf_add_symbol_hook
;
907 collect
= bed
->collect
;
909 if ((abfd
->flags
& DYNAMIC
) == 0)
915 /* You can't use -r against a dynamic object. Also, there's no
916 hope of using a dynamic object which does not exactly match
917 the format of the output file. */
918 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
920 bfd_set_error (bfd_error_invalid_operation
);
925 /* As a GNU extension, any input sections which are named
926 .gnu.warning.SYMBOL are treated as warning symbols for the given
927 symbol. This differs from .gnu.warning sections, which generate
928 warnings when they are included in an output file. */
933 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
937 name
= bfd_get_section_name (abfd
, s
);
938 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
943 name
+= sizeof ".gnu.warning." - 1;
945 /* If this is a shared object, then look up the symbol
946 in the hash table. If it is there, and it is already
947 been defined, then we will not be using the entry
948 from this shared object, so we don't need to warn.
949 FIXME: If we see the definition in a regular object
950 later on, we will warn, but we shouldn't. The only
951 fix is to keep track of what warnings we are supposed
952 to emit, and then handle them all at the end of the
954 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
956 struct elf_link_hash_entry
*h
;
958 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
961 /* FIXME: What about bfd_link_hash_common? */
963 && (h
->root
.type
== bfd_link_hash_defined
964 || h
->root
.type
== bfd_link_hash_defweak
))
966 /* We don't want to issue this warning. Clobber
967 the section size so that the warning does not
968 get copied into the output file. */
974 sz
= bfd_section_size (abfd
, s
);
975 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
979 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
984 if (! (_bfd_generic_link_add_one_symbol
985 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
986 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
989 if (! info
->relocateable
)
991 /* Clobber the section size so that the warning does
992 not get copied into the output file. */
999 /* If this is a dynamic object, we always link against the .dynsym
1000 symbol table, not the .symtab symbol table. The dynamic linker
1001 will only see the .dynsym symbol table, so there is no reason to
1002 look at .symtab for a dynamic object. */
1004 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
1005 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1007 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1011 /* Read in any version definitions. */
1013 if (! _bfd_elf_slurp_version_tables (abfd
))
1016 /* Read in the symbol versions, but don't bother to convert them
1017 to internal format. */
1018 if (elf_dynversym (abfd
) != 0)
1020 Elf_Internal_Shdr
*versymhdr
;
1022 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1023 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
1024 if (extversym
== NULL
)
1026 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1027 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
1028 != versymhdr
->sh_size
))
1033 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1035 /* The sh_info field of the symtab header tells us where the
1036 external symbols start. We don't care about the local symbols at
1038 if (elf_bad_symtab (abfd
))
1040 extsymcount
= symcount
;
1045 extsymcount
= symcount
- hdr
->sh_info
;
1046 extsymoff
= hdr
->sh_info
;
1049 buf
= ((Elf_External_Sym
*)
1050 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
1051 if (buf
== NULL
&& extsymcount
!= 0)
1054 /* We store a pointer to the hash table entry for each external
1056 sym_hash
= ((struct elf_link_hash_entry
**)
1058 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
1059 if (sym_hash
== NULL
)
1061 elf_sym_hashes (abfd
) = sym_hash
;
1067 /* If we are creating a shared library, create all the dynamic
1068 sections immediately. We need to attach them to something,
1069 so we attach them to this BFD, provided it is the right
1070 format. FIXME: If there are no input BFD's of the same
1071 format as the output, we can't make a shared library. */
1073 && ! elf_hash_table (info
)->dynamic_sections_created
1074 && abfd
->xvec
== info
->hash
->creator
)
1076 if (! elf_link_create_dynamic_sections (abfd
, info
))
1085 bfd_size_type oldsize
;
1086 bfd_size_type strindex
;
1088 /* Find the name to use in a DT_NEEDED entry that refers to this
1089 object. If the object has a DT_SONAME entry, we use it.
1090 Otherwise, if the generic linker stuck something in
1091 elf_dt_name, we use that. Otherwise, we just use the file
1092 name. If the generic linker put a null string into
1093 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1094 there is a DT_SONAME entry. */
1096 name
= bfd_get_filename (abfd
);
1097 if (elf_dt_name (abfd
) != NULL
)
1099 name
= elf_dt_name (abfd
);
1102 if (elf_dt_soname (abfd
) != NULL
)
1108 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1111 Elf_External_Dyn
*extdyn
;
1112 Elf_External_Dyn
*extdynend
;
1118 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
1122 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1123 (file_ptr
) 0, s
->_raw_size
))
1126 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1129 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1132 /* The shared libraries distributed with hpux11 have a bogus
1133 sh_link field for the ".dynamic" section. This code detects
1134 when LINK refers to a section that is not a string table and
1135 tries to find the string table for the ".dynsym" section
1137 Elf_Internal_Shdr
*hdr
= elf_elfsections (abfd
)[link
];
1138 if (hdr
->sh_type
!= SHT_STRTAB
)
1140 asection
*s
= bfd_get_section_by_name (abfd
, ".dynsym");
1141 int elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1144 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1149 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1152 for (; extdyn
< extdynend
; extdyn
++)
1154 Elf_Internal_Dyn dyn
;
1156 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1157 if (dyn
.d_tag
== DT_SONAME
)
1159 name
= bfd_elf_string_from_elf_section (abfd
, link
,
1164 if (dyn
.d_tag
== DT_NEEDED
)
1166 struct bfd_link_needed_list
*n
, **pn
;
1169 n
= ((struct bfd_link_needed_list
*)
1170 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1171 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1173 if (n
== NULL
|| fnm
== NULL
)
1175 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1182 for (pn
= &elf_hash_table (info
)->needed
;
1188 if (dyn
.d_tag
== DT_RUNPATH
)
1190 struct bfd_link_needed_list
*n
, **pn
;
1193 /* When we see DT_RPATH before DT_RUNPATH, we have
1194 to clear runpath. Do _NOT_ bfd_release, as that
1195 frees all more recently bfd_alloc'd blocks as
1197 if (rpath
&& elf_hash_table (info
)->runpath
)
1198 elf_hash_table (info
)->runpath
= NULL
;
1200 n
= ((struct bfd_link_needed_list
*)
1201 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1202 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1204 if (n
== NULL
|| fnm
== NULL
)
1206 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1213 for (pn
= &elf_hash_table (info
)->runpath
;
1221 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1222 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
1224 struct bfd_link_needed_list
*n
, **pn
;
1227 n
= ((struct bfd_link_needed_list
*)
1228 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1229 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1231 if (n
== NULL
|| fnm
== NULL
)
1233 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1240 for (pn
= &elf_hash_table (info
)->runpath
;
1253 /* We do not want to include any of the sections in a dynamic
1254 object in the output file. We hack by simply clobbering the
1255 list of sections in the BFD. This could be handled more
1256 cleanly by, say, a new section flag; the existing
1257 SEC_NEVER_LOAD flag is not the one we want, because that one
1258 still implies that the section takes up space in the output
1260 abfd
->sections
= NULL
;
1261 abfd
->section_count
= 0;
1263 /* If this is the first dynamic object found in the link, create
1264 the special sections required for dynamic linking. */
1265 if (! elf_hash_table (info
)->dynamic_sections_created
)
1267 if (! elf_link_create_dynamic_sections (abfd
, info
))
1273 /* Add a DT_NEEDED entry for this dynamic object. */
1274 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1275 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1277 if (strindex
== (bfd_size_type
) -1)
1280 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1283 Elf_External_Dyn
*dyncon
, *dynconend
;
1285 /* The hash table size did not change, which means that
1286 the dynamic object name was already entered. If we
1287 have already included this dynamic object in the
1288 link, just ignore it. There is no reason to include
1289 a particular dynamic object more than once. */
1290 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1292 BFD_ASSERT (sdyn
!= NULL
);
1294 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1295 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1297 for (; dyncon
< dynconend
; dyncon
++)
1299 Elf_Internal_Dyn dyn
;
1301 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1303 if (dyn
.d_tag
== DT_NEEDED
1304 && dyn
.d_un
.d_val
== strindex
)
1308 if (extversym
!= NULL
)
1315 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1319 /* Save the SONAME, if there is one, because sometimes the
1320 linker emulation code will need to know it. */
1322 name
= bfd_get_filename (abfd
);
1323 elf_dt_name (abfd
) = name
;
1327 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1329 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1330 != extsymcount
* sizeof (Elf_External_Sym
)))
1335 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1336 esymend
= buf
+ extsymcount
;
1339 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1341 Elf_Internal_Sym sym
;
1347 struct elf_link_hash_entry
*h
;
1349 boolean size_change_ok
, type_change_ok
;
1350 boolean new_weakdef
;
1351 unsigned int old_alignment
;
1353 elf_swap_symbol_in (abfd
, esym
, &sym
);
1355 flags
= BSF_NO_FLAGS
;
1357 value
= sym
.st_value
;
1360 bind
= ELF_ST_BIND (sym
.st_info
);
1361 if (bind
== STB_LOCAL
)
1363 /* This should be impossible, since ELF requires that all
1364 global symbols follow all local symbols, and that sh_info
1365 point to the first global symbol. Unfortunatealy, Irix 5
1369 else if (bind
== STB_GLOBAL
)
1371 if (sym
.st_shndx
!= SHN_UNDEF
1372 && sym
.st_shndx
!= SHN_COMMON
)
1375 else if (bind
== STB_WEAK
)
1379 /* Leave it up to the processor backend. */
1382 if (sym
.st_shndx
== SHN_UNDEF
)
1383 sec
= bfd_und_section_ptr
;
1384 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1386 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1388 sec
= bfd_abs_section_ptr
;
1389 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1392 else if (sym
.st_shndx
== SHN_ABS
)
1393 sec
= bfd_abs_section_ptr
;
1394 else if (sym
.st_shndx
== SHN_COMMON
)
1396 sec
= bfd_com_section_ptr
;
1397 /* What ELF calls the size we call the value. What ELF
1398 calls the value we call the alignment. */
1399 value
= sym
.st_size
;
1403 /* Leave it up to the processor backend. */
1406 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1407 if (name
== (const char *) NULL
)
1410 if (add_symbol_hook
)
1412 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1416 /* The hook function sets the name to NULL if this symbol
1417 should be skipped for some reason. */
1418 if (name
== (const char *) NULL
)
1422 /* Sanity check that all possibilities were handled. */
1423 if (sec
== (asection
*) NULL
)
1425 bfd_set_error (bfd_error_bad_value
);
1429 if (bfd_is_und_section (sec
)
1430 || bfd_is_com_section (sec
))
1435 size_change_ok
= false;
1436 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1438 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1440 Elf_Internal_Versym iver
;
1441 unsigned int vernum
= 0;
1446 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1447 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1449 /* If this is a hidden symbol, or if it is not version
1450 1, we append the version name to the symbol name.
1451 However, we do not modify a non-hidden absolute
1452 symbol, because it might be the version symbol
1453 itself. FIXME: What if it isn't? */
1454 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1455 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1458 int namelen
, newlen
;
1461 if (sym
.st_shndx
!= SHN_UNDEF
)
1463 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1465 (*_bfd_error_handler
)
1466 (_("%s: %s: invalid version %u (max %d)"),
1467 bfd_get_filename (abfd
), name
, vernum
,
1468 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1469 bfd_set_error (bfd_error_bad_value
);
1472 else if (vernum
> 1)
1474 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1480 /* We cannot simply test for the number of
1481 entries in the VERNEED section since the
1482 numbers for the needed versions do not start
1484 Elf_Internal_Verneed
*t
;
1487 for (t
= elf_tdata (abfd
)->verref
;
1491 Elf_Internal_Vernaux
*a
;
1493 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1495 if (a
->vna_other
== vernum
)
1497 verstr
= a
->vna_nodename
;
1506 (*_bfd_error_handler
)
1507 (_("%s: %s: invalid needed version %d"),
1508 bfd_get_filename (abfd
), name
, vernum
);
1509 bfd_set_error (bfd_error_bad_value
);
1514 namelen
= strlen (name
);
1515 newlen
= namelen
+ strlen (verstr
) + 2;
1516 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1519 newname
= (char *) bfd_alloc (abfd
, newlen
);
1520 if (newname
== NULL
)
1522 strcpy (newname
, name
);
1523 p
= newname
+ namelen
;
1525 /* If this is a defined non-hidden version symbol,
1526 we add another @ to the name. This indicates the
1527 default version of the symbol. */
1528 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1529 && sym
.st_shndx
!= SHN_UNDEF
)
1537 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1538 sym_hash
, &override
, &type_change_ok
,
1539 &size_change_ok
, dt_needed
))
1546 while (h
->root
.type
== bfd_link_hash_indirect
1547 || h
->root
.type
== bfd_link_hash_warning
)
1548 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1550 /* Remember the old alignment if this is a common symbol, so
1551 that we don't reduce the alignment later on. We can't
1552 check later, because _bfd_generic_link_add_one_symbol
1553 will set a default for the alignment which we want to
1555 if (h
->root
.type
== bfd_link_hash_common
)
1556 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1558 if (elf_tdata (abfd
)->verdef
!= NULL
1562 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1565 if (! (_bfd_generic_link_add_one_symbol
1566 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1567 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1571 while (h
->root
.type
== bfd_link_hash_indirect
1572 || h
->root
.type
== bfd_link_hash_warning
)
1573 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1576 new_weakdef
= false;
1579 && (flags
& BSF_WEAK
) != 0
1580 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1581 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1582 && h
->weakdef
== NULL
)
1584 /* Keep a list of all weak defined non function symbols from
1585 a dynamic object, using the weakdef field. Later in this
1586 function we will set the weakdef field to the correct
1587 value. We only put non-function symbols from dynamic
1588 objects on this list, because that happens to be the only
1589 time we need to know the normal symbol corresponding to a
1590 weak symbol, and the information is time consuming to
1591 figure out. If the weakdef field is not already NULL,
1592 then this symbol was already defined by some previous
1593 dynamic object, and we will be using that previous
1594 definition anyhow. */
1601 /* Set the alignment of a common symbol. */
1602 if (sym
.st_shndx
== SHN_COMMON
1603 && h
->root
.type
== bfd_link_hash_common
)
1607 align
= bfd_log2 (sym
.st_value
);
1608 if (align
> old_alignment
1609 /* Permit an alignment power of zero if an alignment of one
1610 is specified and no other alignments have been specified. */
1611 || (sym
.st_value
== 1 && old_alignment
== 0))
1612 h
->root
.u
.c
.p
->alignment_power
= align
;
1615 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1621 /* Remember the symbol size and type. */
1622 if (sym
.st_size
!= 0
1623 && (definition
|| h
->size
== 0))
1625 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1626 (*_bfd_error_handler
)
1627 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1628 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1629 bfd_get_filename (abfd
));
1631 h
->size
= sym
.st_size
;
1634 /* If this is a common symbol, then we always want H->SIZE
1635 to be the size of the common symbol. The code just above
1636 won't fix the size if a common symbol becomes larger. We
1637 don't warn about a size change here, because that is
1638 covered by --warn-common. */
1639 if (h
->root
.type
== bfd_link_hash_common
)
1640 h
->size
= h
->root
.u
.c
.size
;
1642 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1643 && (definition
|| h
->type
== STT_NOTYPE
))
1645 if (h
->type
!= STT_NOTYPE
1646 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1647 && ! type_change_ok
)
1648 (*_bfd_error_handler
)
1649 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1650 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1651 bfd_get_filename (abfd
));
1653 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1656 /* If st_other has a processor-specific meaning, specific code
1657 might be needed here. */
1658 if (sym
.st_other
!= 0)
1660 /* Combine visibilities, using the most constraining one. */
1661 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1662 unsigned char symvis
= ELF_ST_VISIBILITY (sym
.st_other
);
1664 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1665 h
->other
= sym
.st_other
;
1667 /* If neither has visibility, use the st_other of the
1668 definition. This is an arbitrary choice, since the
1669 other bits have no general meaning. */
1670 if (!symvis
&& !hvis
1671 && (definition
|| h
->other
== 0))
1672 h
->other
= sym
.st_other
;
1675 /* Set a flag in the hash table entry indicating the type of
1676 reference or definition we just found. Keep a count of
1677 the number of dynamic symbols we find. A dynamic symbol
1678 is one which is referenced or defined by both a regular
1679 object and a shared object. */
1680 old_flags
= h
->elf_link_hash_flags
;
1686 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1687 if (bind
!= STB_WEAK
)
1688 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1691 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1693 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1694 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1700 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1702 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1703 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1704 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1705 || (h
->weakdef
!= NULL
1707 && h
->weakdef
->dynindx
!= -1))
1711 h
->elf_link_hash_flags
|= new_flag
;
1713 /* If this symbol has a version, and it is the default
1714 version, we create an indirect symbol from the default
1715 name to the fully decorated name. This will cause
1716 external references which do not specify a version to be
1717 bound to this version of the symbol. */
1722 p
= strchr (name
, ELF_VER_CHR
);
1723 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1726 struct elf_link_hash_entry
*hi
;
1729 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1731 if (shortname
== NULL
)
1733 strncpy (shortname
, name
, p
- name
);
1734 shortname
[p
- name
] = '\0';
1736 /* We are going to create a new symbol. Merge it
1737 with any existing symbol with this name. For the
1738 purposes of the merge, act as though we were
1739 defining the symbol we just defined, although we
1740 actually going to define an indirect symbol. */
1741 type_change_ok
= false;
1742 size_change_ok
= false;
1743 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1744 &value
, &hi
, &override
,
1746 &size_change_ok
, dt_needed
))
1751 if (! (_bfd_generic_link_add_one_symbol
1752 (info
, abfd
, shortname
, BSF_INDIRECT
,
1753 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1754 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1759 /* In this case the symbol named SHORTNAME is
1760 overriding the indirect symbol we want to
1761 add. We were planning on making SHORTNAME an
1762 indirect symbol referring to NAME. SHORTNAME
1763 is the name without a version. NAME is the
1764 fully versioned name, and it is the default
1767 Overriding means that we already saw a
1768 definition for the symbol SHORTNAME in a
1769 regular object, and it is overriding the
1770 symbol defined in the dynamic object.
1772 When this happens, we actually want to change
1773 NAME, the symbol we just added, to refer to
1774 SHORTNAME. This will cause references to
1775 NAME in the shared object to become
1776 references to SHORTNAME in the regular
1777 object. This is what we expect when we
1778 override a function in a shared object: that
1779 the references in the shared object will be
1780 mapped to the definition in the regular
1783 while (hi
->root
.type
== bfd_link_hash_indirect
1784 || hi
->root
.type
== bfd_link_hash_warning
)
1785 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1787 h
->root
.type
= bfd_link_hash_indirect
;
1788 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1789 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1791 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1792 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1793 if (hi
->elf_link_hash_flags
1794 & (ELF_LINK_HASH_REF_REGULAR
1795 | ELF_LINK_HASH_DEF_REGULAR
))
1797 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1803 /* Now set HI to H, so that the following code
1804 will set the other fields correctly. */
1808 /* If there is a duplicate definition somewhere,
1809 then HI may not point to an indirect symbol. We
1810 will have reported an error to the user in that
1813 if (hi
->root
.type
== bfd_link_hash_indirect
)
1815 struct elf_link_hash_entry
*ht
;
1817 /* If the symbol became indirect, then we assume
1818 that we have not seen a definition before. */
1819 BFD_ASSERT ((hi
->elf_link_hash_flags
1820 & (ELF_LINK_HASH_DEF_DYNAMIC
1821 | ELF_LINK_HASH_DEF_REGULAR
))
1824 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1825 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1827 /* See if the new flags lead us to realize that
1828 the symbol must be dynamic. */
1834 || ((hi
->elf_link_hash_flags
1835 & ELF_LINK_HASH_REF_DYNAMIC
)
1841 if ((hi
->elf_link_hash_flags
1842 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1848 /* We also need to define an indirection from the
1849 nondefault version of the symbol. */
1851 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1853 if (shortname
== NULL
)
1855 strncpy (shortname
, name
, p
- name
);
1856 strcpy (shortname
+ (p
- name
), p
+ 1);
1858 /* Once again, merge with any existing symbol. */
1859 type_change_ok
= false;
1860 size_change_ok
= false;
1861 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1862 &value
, &hi
, &override
,
1864 &size_change_ok
, dt_needed
))
1869 /* Here SHORTNAME is a versioned name, so we
1870 don't expect to see the type of override we
1871 do in the case above. */
1872 (*_bfd_error_handler
)
1873 (_("%s: warning: unexpected redefinition of `%s'"),
1874 bfd_get_filename (abfd
), shortname
);
1878 if (! (_bfd_generic_link_add_one_symbol
1879 (info
, abfd
, shortname
, BSF_INDIRECT
,
1880 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1881 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1884 /* If there is a duplicate definition somewhere,
1885 then HI may not point to an indirect symbol.
1886 We will have reported an error to the user in
1889 if (hi
->root
.type
== bfd_link_hash_indirect
)
1891 /* If the symbol became indirect, then we
1892 assume that we have not seen a definition
1894 BFD_ASSERT ((hi
->elf_link_hash_flags
1895 & (ELF_LINK_HASH_DEF_DYNAMIC
1896 | ELF_LINK_HASH_DEF_REGULAR
))
1899 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1901 /* See if the new flags lead us to realize
1902 that the symbol must be dynamic. */
1908 || ((hi
->elf_link_hash_flags
1909 & ELF_LINK_HASH_REF_DYNAMIC
)
1915 if ((hi
->elf_link_hash_flags
1916 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1925 if (dynsym
&& h
->dynindx
== -1)
1927 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1929 if (h
->weakdef
!= NULL
1931 && h
->weakdef
->dynindx
== -1)
1933 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1938 else if (dynsym
&& h
->dynindx
!= -1)
1939 /* If the symbol already has a dynamic index, but
1940 visibility says it should not be visible, turn it into
1942 switch (ELF_ST_VISIBILITY (h
->other
))
1946 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
1947 (*bed
->elf_backend_hide_symbol
) (info
, h
);
1951 if (dt_needed
&& definition
1952 && (h
->elf_link_hash_flags
1953 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1955 bfd_size_type oldsize
;
1956 bfd_size_type strindex
;
1958 /* The symbol from a DT_NEEDED object is referenced from
1959 the regular object to create a dynamic executable. We
1960 have to make sure there is a DT_NEEDED entry for it. */
1963 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1964 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
1965 elf_dt_soname (abfd
),
1967 if (strindex
== (bfd_size_type
) -1)
1971 == _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1974 Elf_External_Dyn
*dyncon
, *dynconend
;
1976 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1978 BFD_ASSERT (sdyn
!= NULL
);
1980 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1981 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1983 for (; dyncon
< dynconend
; dyncon
++)
1985 Elf_Internal_Dyn dyn
;
1987 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
,
1989 BFD_ASSERT (dyn
.d_tag
!= DT_NEEDED
||
1990 dyn
.d_un
.d_val
!= strindex
);
1994 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
2000 /* Now set the weakdefs field correctly for all the weak defined
2001 symbols we found. The only way to do this is to search all the
2002 symbols. Since we only need the information for non functions in
2003 dynamic objects, that's the only time we actually put anything on
2004 the list WEAKS. We need this information so that if a regular
2005 object refers to a symbol defined weakly in a dynamic object, the
2006 real symbol in the dynamic object is also put in the dynamic
2007 symbols; we also must arrange for both symbols to point to the
2008 same memory location. We could handle the general case of symbol
2009 aliasing, but a general symbol alias can only be generated in
2010 assembler code, handling it correctly would be very time
2011 consuming, and other ELF linkers don't handle general aliasing
2013 while (weaks
!= NULL
)
2015 struct elf_link_hash_entry
*hlook
;
2018 struct elf_link_hash_entry
**hpp
;
2019 struct elf_link_hash_entry
**hppend
;
2022 weaks
= hlook
->weakdef
;
2023 hlook
->weakdef
= NULL
;
2025 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
2026 || hlook
->root
.type
== bfd_link_hash_defweak
2027 || hlook
->root
.type
== bfd_link_hash_common
2028 || hlook
->root
.type
== bfd_link_hash_indirect
);
2029 slook
= hlook
->root
.u
.def
.section
;
2030 vlook
= hlook
->root
.u
.def
.value
;
2032 hpp
= elf_sym_hashes (abfd
);
2033 hppend
= hpp
+ extsymcount
;
2034 for (; hpp
< hppend
; hpp
++)
2036 struct elf_link_hash_entry
*h
;
2039 if (h
!= NULL
&& h
!= hlook
2040 && h
->root
.type
== bfd_link_hash_defined
2041 && h
->root
.u
.def
.section
== slook
2042 && h
->root
.u
.def
.value
== vlook
)
2046 /* If the weak definition is in the list of dynamic
2047 symbols, make sure the real definition is put there
2049 if (hlook
->dynindx
!= -1
2050 && h
->dynindx
== -1)
2052 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2056 /* If the real definition is in the list of dynamic
2057 symbols, make sure the weak definition is put there
2058 as well. If we don't do this, then the dynamic
2059 loader might not merge the entries for the real
2060 definition and the weak definition. */
2061 if (h
->dynindx
!= -1
2062 && hlook
->dynindx
== -1)
2064 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
2079 if (extversym
!= NULL
)
2085 /* If this object is the same format as the output object, and it is
2086 not a shared library, then let the backend look through the
2089 This is required to build global offset table entries and to
2090 arrange for dynamic relocs. It is not required for the
2091 particular common case of linking non PIC code, even when linking
2092 against shared libraries, but unfortunately there is no way of
2093 knowing whether an object file has been compiled PIC or not.
2094 Looking through the relocs is not particularly time consuming.
2095 The problem is that we must either (1) keep the relocs in memory,
2096 which causes the linker to require additional runtime memory or
2097 (2) read the relocs twice from the input file, which wastes time.
2098 This would be a good case for using mmap.
2100 I have no idea how to handle linking PIC code into a file of a
2101 different format. It probably can't be done. */
2102 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
2104 && abfd
->xvec
== info
->hash
->creator
2105 && check_relocs
!= NULL
)
2109 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2111 Elf_Internal_Rela
*internal_relocs
;
2114 if ((o
->flags
& SEC_RELOC
) == 0
2115 || o
->reloc_count
== 0
2116 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
2117 && (o
->flags
& SEC_DEBUGGING
) != 0)
2118 || bfd_is_abs_section (o
->output_section
))
2121 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2122 (abfd
, o
, (PTR
) NULL
,
2123 (Elf_Internal_Rela
*) NULL
,
2124 info
->keep_memory
));
2125 if (internal_relocs
== NULL
)
2128 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2130 if (! info
->keep_memory
)
2131 free (internal_relocs
);
2138 /* If this is a non-traditional, non-relocateable link, try to
2139 optimize the handling of the .stab/.stabstr sections. */
2141 && ! info
->relocateable
2142 && ! info
->traditional_format
2143 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2144 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2146 asection
*stab
, *stabstr
;
2148 stab
= bfd_get_section_by_name (abfd
, ".stab");
2151 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2153 if (stabstr
!= NULL
)
2155 struct bfd_elf_section_data
*secdata
;
2157 secdata
= elf_section_data (stab
);
2158 if (! _bfd_link_section_stabs (abfd
,
2159 &elf_hash_table (info
)->stab_info
,
2161 &secdata
->stab_info
))
2176 if (extversym
!= NULL
)
2181 /* Create some sections which will be filled in with dynamic linking
2182 information. ABFD is an input file which requires dynamic sections
2183 to be created. The dynamic sections take up virtual memory space
2184 when the final executable is run, so we need to create them before
2185 addresses are assigned to the output sections. We work out the
2186 actual contents and size of these sections later. */
2189 elf_link_create_dynamic_sections (abfd
, info
)
2191 struct bfd_link_info
*info
;
2194 register asection
*s
;
2195 struct elf_link_hash_entry
*h
;
2196 struct elf_backend_data
*bed
;
2198 if (elf_hash_table (info
)->dynamic_sections_created
)
2201 /* Make sure that all dynamic sections use the same input BFD. */
2202 if (elf_hash_table (info
)->dynobj
== NULL
)
2203 elf_hash_table (info
)->dynobj
= abfd
;
2205 abfd
= elf_hash_table (info
)->dynobj
;
2207 /* Note that we set the SEC_IN_MEMORY flag for all of these
2209 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2210 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2212 /* A dynamically linked executable has a .interp section, but a
2213 shared library does not. */
2216 s
= bfd_make_section (abfd
, ".interp");
2218 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2222 /* Create sections to hold version informations. These are removed
2223 if they are not needed. */
2224 s
= bfd_make_section (abfd
, ".gnu.version_d");
2226 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2227 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2230 s
= bfd_make_section (abfd
, ".gnu.version");
2232 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2233 || ! bfd_set_section_alignment (abfd
, s
, 1))
2236 s
= bfd_make_section (abfd
, ".gnu.version_r");
2238 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2239 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2242 s
= bfd_make_section (abfd
, ".dynsym");
2244 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2245 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2248 s
= bfd_make_section (abfd
, ".dynstr");
2250 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2253 /* Create a strtab to hold the dynamic symbol names. */
2254 if (elf_hash_table (info
)->dynstr
== NULL
)
2256 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
2257 if (elf_hash_table (info
)->dynstr
== NULL
)
2261 s
= bfd_make_section (abfd
, ".dynamic");
2263 || ! bfd_set_section_flags (abfd
, s
, flags
)
2264 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2267 /* The special symbol _DYNAMIC is always set to the start of the
2268 .dynamic section. This call occurs before we have processed the
2269 symbols for any dynamic object, so we don't have to worry about
2270 overriding a dynamic definition. We could set _DYNAMIC in a
2271 linker script, but we only want to define it if we are, in fact,
2272 creating a .dynamic section. We don't want to define it if there
2273 is no .dynamic section, since on some ELF platforms the start up
2274 code examines it to decide how to initialize the process. */
2276 if (! (_bfd_generic_link_add_one_symbol
2277 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2278 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2279 (struct bfd_link_hash_entry
**) &h
)))
2281 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2282 h
->type
= STT_OBJECT
;
2285 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2288 bed
= get_elf_backend_data (abfd
);
2290 s
= bfd_make_section (abfd
, ".hash");
2292 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2293 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2295 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2297 /* Let the backend create the rest of the sections. This lets the
2298 backend set the right flags. The backend will normally create
2299 the .got and .plt sections. */
2300 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2303 elf_hash_table (info
)->dynamic_sections_created
= true;
2308 /* Add an entry to the .dynamic table. */
2311 elf_add_dynamic_entry (info
, tag
, val
)
2312 struct bfd_link_info
*info
;
2316 Elf_Internal_Dyn dyn
;
2320 bfd_byte
*newcontents
;
2322 dynobj
= elf_hash_table (info
)->dynobj
;
2324 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2325 BFD_ASSERT (s
!= NULL
);
2327 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2328 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2329 if (newcontents
== NULL
)
2333 dyn
.d_un
.d_val
= val
;
2334 elf_swap_dyn_out (dynobj
, &dyn
,
2335 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2337 s
->_raw_size
= newsize
;
2338 s
->contents
= newcontents
;
2343 /* Record a new local dynamic symbol. */
2346 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2347 struct bfd_link_info
*info
;
2351 struct elf_link_local_dynamic_entry
*entry
;
2352 struct elf_link_hash_table
*eht
;
2353 struct bfd_strtab_hash
*dynstr
;
2354 Elf_External_Sym esym
;
2355 unsigned long dynstr_index
;
2358 /* See if the entry exists already. */
2359 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2360 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2363 entry
= (struct elf_link_local_dynamic_entry
*)
2364 bfd_alloc (input_bfd
, sizeof (*entry
));
2368 /* Go find the symbol, so that we can find it's name. */
2369 if (bfd_seek (input_bfd
,
2370 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2371 + input_indx
* sizeof (Elf_External_Sym
)),
2373 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2374 != sizeof (Elf_External_Sym
)))
2376 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2378 name
= (bfd_elf_string_from_elf_section
2379 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2380 entry
->isym
.st_name
));
2382 dynstr
= elf_hash_table (info
)->dynstr
;
2385 /* Create a strtab to hold the dynamic symbol names. */
2386 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2391 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2392 if (dynstr_index
== (unsigned long) -1)
2394 entry
->isym
.st_name
= dynstr_index
;
2396 eht
= elf_hash_table (info
);
2398 entry
->next
= eht
->dynlocal
;
2399 eht
->dynlocal
= entry
;
2400 entry
->input_bfd
= input_bfd
;
2401 entry
->input_indx
= input_indx
;
2404 /* Whatever binding the symbol had before, it's now local. */
2406 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2408 /* The dynindx will be set at the end of size_dynamic_sections. */
2414 /* Read and swap the relocs from the section indicated by SHDR. This
2415 may be either a REL or a RELA section. The relocations are
2416 translated into RELA relocations and stored in INTERNAL_RELOCS,
2417 which should have already been allocated to contain enough space.
2418 The EXTERNAL_RELOCS are a buffer where the external form of the
2419 relocations should be stored.
2421 Returns false if something goes wrong. */
2424 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2427 Elf_Internal_Shdr
*shdr
;
2428 PTR external_relocs
;
2429 Elf_Internal_Rela
*internal_relocs
;
2431 struct elf_backend_data
*bed
;
2433 /* If there aren't any relocations, that's OK. */
2437 /* Position ourselves at the start of the section. */
2438 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2441 /* Read the relocations. */
2442 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2446 bed
= get_elf_backend_data (abfd
);
2448 /* Convert the external relocations to the internal format. */
2449 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2451 Elf_External_Rel
*erel
;
2452 Elf_External_Rel
*erelend
;
2453 Elf_Internal_Rela
*irela
;
2454 Elf_Internal_Rel
*irel
;
2456 erel
= (Elf_External_Rel
*) external_relocs
;
2457 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2458 irela
= internal_relocs
;
2459 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2460 * sizeof (Elf_Internal_Rel
)));
2461 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2465 if (bed
->s
->swap_reloc_in
)
2466 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2468 elf_swap_reloc_in (abfd
, erel
, irel
);
2470 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2472 irela
[i
].r_offset
= irel
[i
].r_offset
;
2473 irela
[i
].r_info
= irel
[i
].r_info
;
2474 irela
[i
].r_addend
= 0;
2480 Elf_External_Rela
*erela
;
2481 Elf_External_Rela
*erelaend
;
2482 Elf_Internal_Rela
*irela
;
2484 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2486 erela
= (Elf_External_Rela
*) external_relocs
;
2487 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2488 irela
= internal_relocs
;
2489 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2491 if (bed
->s
->swap_reloca_in
)
2492 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2494 elf_swap_reloca_in (abfd
, erela
, irela
);
2501 /* Read and swap the relocs for a section O. They may have been
2502 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2503 not NULL, they are used as buffers to read into. They are known to
2504 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2505 the return value is allocated using either malloc or bfd_alloc,
2506 according to the KEEP_MEMORY argument. If O has two relocation
2507 sections (both REL and RELA relocations), then the REL_HDR
2508 relocations will appear first in INTERNAL_RELOCS, followed by the
2509 REL_HDR2 relocations. */
2512 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2516 PTR external_relocs
;
2517 Elf_Internal_Rela
*internal_relocs
;
2518 boolean keep_memory
;
2520 Elf_Internal_Shdr
*rel_hdr
;
2522 Elf_Internal_Rela
*alloc2
= NULL
;
2523 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2525 if (elf_section_data (o
)->relocs
!= NULL
)
2526 return elf_section_data (o
)->relocs
;
2528 if (o
->reloc_count
== 0)
2531 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2533 if (internal_relocs
== NULL
)
2537 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2538 * sizeof (Elf_Internal_Rela
));
2540 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2542 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2543 if (internal_relocs
== NULL
)
2547 if (external_relocs
== NULL
)
2549 size_t size
= (size_t) rel_hdr
->sh_size
;
2551 if (elf_section_data (o
)->rel_hdr2
)
2552 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2553 alloc1
= (PTR
) bfd_malloc (size
);
2556 external_relocs
= alloc1
;
2559 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2563 if (!elf_link_read_relocs_from_section
2565 elf_section_data (o
)->rel_hdr2
,
2566 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2567 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2568 * bed
->s
->int_rels_per_ext_rel
)))
2571 /* Cache the results for next time, if we can. */
2573 elf_section_data (o
)->relocs
= internal_relocs
;
2578 /* Don't free alloc2, since if it was allocated we are passing it
2579 back (under the name of internal_relocs). */
2581 return internal_relocs
;
2592 /* Record an assignment to a symbol made by a linker script. We need
2593 this in case some dynamic object refers to this symbol. */
2597 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2598 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2599 struct bfd_link_info
*info
;
2603 struct elf_link_hash_entry
*h
;
2605 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2608 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2612 if (h
->root
.type
== bfd_link_hash_new
)
2613 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2615 /* If this symbol is being provided by the linker script, and it is
2616 currently defined by a dynamic object, but not by a regular
2617 object, then mark it as undefined so that the generic linker will
2618 force the correct value. */
2620 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2621 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2622 h
->root
.type
= bfd_link_hash_undefined
;
2624 /* If this symbol is not being provided by the linker script, and it is
2625 currently defined by a dynamic object, but not by a regular object,
2626 then clear out any version information because the symbol will not be
2627 associated with the dynamic object any more. */
2629 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2630 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2631 h
->verinfo
.verdef
= NULL
;
2633 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2635 /* When possible, keep the original type of the symbol */
2636 if (h
->type
== STT_NOTYPE
)
2637 h
->type
= STT_OBJECT
;
2639 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2640 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2642 && h
->dynindx
== -1)
2644 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2647 /* If this is a weak defined symbol, and we know a corresponding
2648 real symbol from the same dynamic object, make sure the real
2649 symbol is also made into a dynamic symbol. */
2650 if (h
->weakdef
!= NULL
2651 && h
->weakdef
->dynindx
== -1)
2653 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2661 /* This structure is used to pass information to
2662 elf_link_assign_sym_version. */
2664 struct elf_assign_sym_version_info
2668 /* General link information. */
2669 struct bfd_link_info
*info
;
2671 struct bfd_elf_version_tree
*verdefs
;
2672 /* Whether we are exporting all dynamic symbols. */
2673 boolean export_dynamic
;
2674 /* Whether we had a failure. */
2678 /* This structure is used to pass information to
2679 elf_link_find_version_dependencies. */
2681 struct elf_find_verdep_info
2685 /* General link information. */
2686 struct bfd_link_info
*info
;
2687 /* The number of dependencies. */
2689 /* Whether we had a failure. */
2693 /* Array used to determine the number of hash table buckets to use
2694 based on the number of symbols there are. If there are fewer than
2695 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2696 fewer than 37 we use 17 buckets, and so forth. We never use more
2697 than 32771 buckets. */
2699 static const size_t elf_buckets
[] =
2701 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2705 /* Compute bucket count for hashing table. We do not use a static set
2706 of possible tables sizes anymore. Instead we determine for all
2707 possible reasonable sizes of the table the outcome (i.e., the
2708 number of collisions etc) and choose the best solution. The
2709 weighting functions are not too simple to allow the table to grow
2710 without bounds. Instead one of the weighting factors is the size.
2711 Therefore the result is always a good payoff between few collisions
2712 (= short chain lengths) and table size. */
2714 compute_bucket_count (info
)
2715 struct bfd_link_info
*info
;
2717 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2718 size_t best_size
= 0;
2719 unsigned long int *hashcodes
;
2720 unsigned long int *hashcodesp
;
2721 unsigned long int i
;
2723 /* Compute the hash values for all exported symbols. At the same
2724 time store the values in an array so that we could use them for
2726 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2727 * sizeof (unsigned long int));
2728 if (hashcodes
== NULL
)
2730 hashcodesp
= hashcodes
;
2732 /* Put all hash values in HASHCODES. */
2733 elf_link_hash_traverse (elf_hash_table (info
),
2734 elf_collect_hash_codes
, &hashcodesp
);
2736 /* We have a problem here. The following code to optimize the table
2737 size requires an integer type with more the 32 bits. If
2738 BFD_HOST_U_64_BIT is set we know about such a type. */
2739 #ifdef BFD_HOST_U_64_BIT
2740 if (info
->optimize
== true)
2742 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2745 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2746 unsigned long int *counts
;
2748 /* Possible optimization parameters: if we have NSYMS symbols we say
2749 that the hashing table must at least have NSYMS/4 and at most
2751 minsize
= nsyms
/ 4;
2754 best_size
= maxsize
= nsyms
* 2;
2756 /* Create array where we count the collisions in. We must use bfd_malloc
2757 since the size could be large. */
2758 counts
= (unsigned long int *) bfd_malloc (maxsize
2759 * sizeof (unsigned long int));
2766 /* Compute the "optimal" size for the hash table. The criteria is a
2767 minimal chain length. The minor criteria is (of course) the size
2769 for (i
= minsize
; i
< maxsize
; ++i
)
2771 /* Walk through the array of hashcodes and count the collisions. */
2772 BFD_HOST_U_64_BIT max
;
2773 unsigned long int j
;
2774 unsigned long int fact
;
2776 memset (counts
, '\0', i
* sizeof (unsigned long int));
2778 /* Determine how often each hash bucket is used. */
2779 for (j
= 0; j
< nsyms
; ++j
)
2780 ++counts
[hashcodes
[j
] % i
];
2782 /* For the weight function we need some information about the
2783 pagesize on the target. This is information need not be 100%
2784 accurate. Since this information is not available (so far) we
2785 define it here to a reasonable default value. If it is crucial
2786 to have a better value some day simply define this value. */
2787 # ifndef BFD_TARGET_PAGESIZE
2788 # define BFD_TARGET_PAGESIZE (4096)
2791 /* We in any case need 2 + NSYMS entries for the size values and
2793 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2796 /* Variant 1: optimize for short chains. We add the squares
2797 of all the chain lengths (which favous many small chain
2798 over a few long chains). */
2799 for (j
= 0; j
< i
; ++j
)
2800 max
+= counts
[j
] * counts
[j
];
2802 /* This adds penalties for the overall size of the table. */
2803 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2806 /* Variant 2: Optimize a lot more for small table. Here we
2807 also add squares of the size but we also add penalties for
2808 empty slots (the +1 term). */
2809 for (j
= 0; j
< i
; ++j
)
2810 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2812 /* The overall size of the table is considered, but not as
2813 strong as in variant 1, where it is squared. */
2814 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2818 /* Compare with current best results. */
2819 if (max
< best_chlen
)
2829 #endif /* defined (BFD_HOST_U_64_BIT) */
2831 /* This is the fallback solution if no 64bit type is available or if we
2832 are not supposed to spend much time on optimizations. We select the
2833 bucket count using a fixed set of numbers. */
2834 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2836 best_size
= elf_buckets
[i
];
2837 if (dynsymcount
< elf_buckets
[i
+ 1])
2842 /* Free the arrays we needed. */
2848 /* Set up the sizes and contents of the ELF dynamic sections. This is
2849 called by the ELF linker emulation before_allocation routine. We
2850 must set the sizes of the sections before the linker sets the
2851 addresses of the various sections. */
2854 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2855 export_dynamic
, filter_shlib
,
2856 auxiliary_filters
, info
, sinterpptr
,
2861 boolean export_dynamic
;
2862 const char *filter_shlib
;
2863 const char * const *auxiliary_filters
;
2864 struct bfd_link_info
*info
;
2865 asection
**sinterpptr
;
2866 struct bfd_elf_version_tree
*verdefs
;
2868 bfd_size_type soname_indx
;
2870 struct elf_backend_data
*bed
;
2871 struct elf_assign_sym_version_info asvinfo
;
2875 soname_indx
= (bfd_size_type
) -1;
2877 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2880 /* The backend may have to create some sections regardless of whether
2881 we're dynamic or not. */
2882 bed
= get_elf_backend_data (output_bfd
);
2883 if (bed
->elf_backend_always_size_sections
2884 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2887 dynobj
= elf_hash_table (info
)->dynobj
;
2889 /* If there were no dynamic objects in the link, there is nothing to
2894 if (elf_hash_table (info
)->dynamic_sections_created
)
2896 struct elf_info_failed eif
;
2897 struct elf_link_hash_entry
*h
;
2900 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2901 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2905 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2906 soname
, true, true);
2907 if (soname_indx
== (bfd_size_type
) -1
2908 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2914 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2916 info
->flags
|= DF_SYMBOLIC
;
2923 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2925 if (indx
== (bfd_size_type
) -1
2926 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
)
2928 && ! elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
)))
2932 if (filter_shlib
!= NULL
)
2936 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2937 filter_shlib
, true, true);
2938 if (indx
== (bfd_size_type
) -1
2939 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2943 if (auxiliary_filters
!= NULL
)
2945 const char * const *p
;
2947 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2951 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2953 if (indx
== (bfd_size_type
) -1
2954 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2959 /* If we are supposed to export all symbols into the dynamic symbol
2960 table (this is not the normal case), then do so. */
2963 struct elf_info_failed eif
;
2967 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2973 /* Attach all the symbols to their version information. */
2974 asvinfo
.output_bfd
= output_bfd
;
2975 asvinfo
.info
= info
;
2976 asvinfo
.verdefs
= verdefs
;
2977 asvinfo
.export_dynamic
= export_dynamic
;
2978 asvinfo
.failed
= false;
2980 elf_link_hash_traverse (elf_hash_table (info
),
2981 elf_link_assign_sym_version
,
2986 /* Find all symbols which were defined in a dynamic object and make
2987 the backend pick a reasonable value for them. */
2990 elf_link_hash_traverse (elf_hash_table (info
),
2991 elf_adjust_dynamic_symbol
,
2996 /* Add some entries to the .dynamic section. We fill in some of the
2997 values later, in elf_bfd_final_link, but we must add the entries
2998 now so that we know the final size of the .dynamic section. */
3000 /* If there are initialization and/or finalization functions to
3001 call then add the corresponding DT_INIT/DT_FINI entries. */
3002 h
= (info
->init_function
3003 ? elf_link_hash_lookup (elf_hash_table (info
),
3004 info
->init_function
, false,
3008 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3009 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3011 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
3014 h
= (info
->fini_function
3015 ? elf_link_hash_lookup (elf_hash_table (info
),
3016 info
->fini_function
, false,
3020 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3021 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3023 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
3027 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
3028 /* If .dynstr is excluded from the link, we don't want any of
3029 these tags. Strictly, we should be checking each section
3030 individually; This quick check covers for the case where
3031 someone does a /DISCARD/ : { *(*) }. */
3032 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
3034 bfd_size_type strsize
;
3036 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3037 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
3038 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
3039 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
3040 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
3041 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
3042 sizeof (Elf_External_Sym
)))
3047 /* The backend must work out the sizes of all the other dynamic
3049 if (bed
->elf_backend_size_dynamic_sections
3050 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
3053 if (elf_hash_table (info
)->dynamic_sections_created
)
3057 size_t bucketcount
= 0;
3058 size_t hash_entry_size
;
3060 /* Set up the version definition section. */
3061 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3062 BFD_ASSERT (s
!= NULL
);
3064 /* We may have created additional version definitions if we are
3065 just linking a regular application. */
3066 verdefs
= asvinfo
.verdefs
;
3068 if (verdefs
== NULL
)
3069 _bfd_strip_section_from_output (info
, s
);
3074 struct bfd_elf_version_tree
*t
;
3076 Elf_Internal_Verdef def
;
3077 Elf_Internal_Verdaux defaux
;
3082 /* Make space for the base version. */
3083 size
+= sizeof (Elf_External_Verdef
);
3084 size
+= sizeof (Elf_External_Verdaux
);
3087 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3089 struct bfd_elf_version_deps
*n
;
3091 size
+= sizeof (Elf_External_Verdef
);
3092 size
+= sizeof (Elf_External_Verdaux
);
3095 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3096 size
+= sizeof (Elf_External_Verdaux
);
3099 s
->_raw_size
= size
;
3100 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3101 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3104 /* Fill in the version definition section. */
3108 def
.vd_version
= VER_DEF_CURRENT
;
3109 def
.vd_flags
= VER_FLG_BASE
;
3112 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3113 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3114 + sizeof (Elf_External_Verdaux
));
3116 if (soname_indx
!= (bfd_size_type
) -1)
3118 def
.vd_hash
= bfd_elf_hash (soname
);
3119 defaux
.vda_name
= soname_indx
;
3126 name
= output_bfd
->filename
;
3127 def
.vd_hash
= bfd_elf_hash (name
);
3128 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3130 if (indx
== (bfd_size_type
) -1)
3132 defaux
.vda_name
= indx
;
3134 defaux
.vda_next
= 0;
3136 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3137 (Elf_External_Verdef
*)p
);
3138 p
+= sizeof (Elf_External_Verdef
);
3139 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3140 (Elf_External_Verdaux
*) p
);
3141 p
+= sizeof (Elf_External_Verdaux
);
3143 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3146 struct bfd_elf_version_deps
*n
;
3147 struct elf_link_hash_entry
*h
;
3150 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3153 /* Add a symbol representing this version. */
3155 if (! (_bfd_generic_link_add_one_symbol
3156 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3157 (bfd_vma
) 0, (const char *) NULL
, false,
3158 get_elf_backend_data (dynobj
)->collect
,
3159 (struct bfd_link_hash_entry
**) &h
)))
3161 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3162 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3163 h
->type
= STT_OBJECT
;
3164 h
->verinfo
.vertree
= t
;
3166 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3169 def
.vd_version
= VER_DEF_CURRENT
;
3171 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3172 def
.vd_flags
|= VER_FLG_WEAK
;
3173 def
.vd_ndx
= t
->vernum
+ 1;
3174 def
.vd_cnt
= cdeps
+ 1;
3175 def
.vd_hash
= bfd_elf_hash (t
->name
);
3176 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3177 if (t
->next
!= NULL
)
3178 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3179 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3183 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3184 (Elf_External_Verdef
*) p
);
3185 p
+= sizeof (Elf_External_Verdef
);
3187 defaux
.vda_name
= h
->dynstr_index
;
3188 if (t
->deps
== NULL
)
3189 defaux
.vda_next
= 0;
3191 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3192 t
->name_indx
= defaux
.vda_name
;
3194 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3195 (Elf_External_Verdaux
*) p
);
3196 p
+= sizeof (Elf_External_Verdaux
);
3198 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3200 if (n
->version_needed
== NULL
)
3202 /* This can happen if there was an error in the
3204 defaux
.vda_name
= 0;
3207 defaux
.vda_name
= n
->version_needed
->name_indx
;
3208 if (n
->next
== NULL
)
3209 defaux
.vda_next
= 0;
3211 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3213 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3214 (Elf_External_Verdaux
*) p
);
3215 p
+= sizeof (Elf_External_Verdaux
);
3219 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
3220 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
3223 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3226 if (info
->new_dtags
&& info
->flags
)
3228 if (! elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
3235 info
->flags_1
&= ~ (DF_1_INITFIRST
3238 if (! elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
3242 /* Work out the size of the version reference section. */
3244 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3245 BFD_ASSERT (s
!= NULL
);
3247 struct elf_find_verdep_info sinfo
;
3249 sinfo
.output_bfd
= output_bfd
;
3251 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3252 if (sinfo
.vers
== 0)
3254 sinfo
.failed
= false;
3256 elf_link_hash_traverse (elf_hash_table (info
),
3257 elf_link_find_version_dependencies
,
3260 if (elf_tdata (output_bfd
)->verref
== NULL
)
3261 _bfd_strip_section_from_output (info
, s
);
3264 Elf_Internal_Verneed
*t
;
3269 /* Build the version definition section. */
3272 for (t
= elf_tdata (output_bfd
)->verref
;
3276 Elf_Internal_Vernaux
*a
;
3278 size
+= sizeof (Elf_External_Verneed
);
3280 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3281 size
+= sizeof (Elf_External_Vernaux
);
3284 s
->_raw_size
= size
;
3285 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
3286 if (s
->contents
== NULL
)
3290 for (t
= elf_tdata (output_bfd
)->verref
;
3295 Elf_Internal_Vernaux
*a
;
3299 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3302 t
->vn_version
= VER_NEED_CURRENT
;
3304 if (elf_dt_name (t
->vn_bfd
) != NULL
)
3305 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3306 elf_dt_name (t
->vn_bfd
),
3309 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3310 t
->vn_bfd
->filename
, true, false);
3311 if (indx
== (bfd_size_type
) -1)
3314 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3315 if (t
->vn_nextref
== NULL
)
3318 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3319 + caux
* sizeof (Elf_External_Vernaux
));
3321 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3322 (Elf_External_Verneed
*) p
);
3323 p
+= sizeof (Elf_External_Verneed
);
3325 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3327 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3328 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3329 a
->vna_nodename
, true, false);
3330 if (indx
== (bfd_size_type
) -1)
3333 if (a
->vna_nextptr
== NULL
)
3336 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3338 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3339 (Elf_External_Vernaux
*) p
);
3340 p
+= sizeof (Elf_External_Vernaux
);
3344 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3345 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3348 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3352 /* Assign dynsym indicies. In a shared library we generate a
3353 section symbol for each output section, which come first.
3354 Next come all of the back-end allocated local dynamic syms,
3355 followed by the rest of the global symbols. */
3357 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3359 /* Work out the size of the symbol version section. */
3360 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3361 BFD_ASSERT (s
!= NULL
);
3362 if (dynsymcount
== 0
3363 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3365 _bfd_strip_section_from_output (info
, s
);
3366 /* The DYNSYMCOUNT might have changed if we were going to
3367 output a dynamic symbol table entry for S. */
3368 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3372 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3373 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3374 if (s
->contents
== NULL
)
3377 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3381 /* Set the size of the .dynsym and .hash sections. We counted
3382 the number of dynamic symbols in elf_link_add_object_symbols.
3383 We will build the contents of .dynsym and .hash when we build
3384 the final symbol table, because until then we do not know the
3385 correct value to give the symbols. We built the .dynstr
3386 section as we went along in elf_link_add_object_symbols. */
3387 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3388 BFD_ASSERT (s
!= NULL
);
3389 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3390 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3391 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3394 if (dynsymcount
!= 0)
3396 Elf_Internal_Sym isym
;
3398 /* The first entry in .dynsym is a dummy symbol. */
3405 elf_swap_symbol_out (output_bfd
, &isym
,
3406 (PTR
) (Elf_External_Sym
*) s
->contents
);
3409 /* Compute the size of the hashing table. As a side effect this
3410 computes the hash values for all the names we export. */
3411 bucketcount
= compute_bucket_count (info
);
3413 s
= bfd_get_section_by_name (dynobj
, ".hash");
3414 BFD_ASSERT (s
!= NULL
);
3415 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3416 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3417 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3418 if (s
->contents
== NULL
)
3420 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3422 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3423 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3424 s
->contents
+ hash_entry_size
);
3426 elf_hash_table (info
)->bucketcount
= bucketcount
;
3428 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3429 BFD_ASSERT (s
!= NULL
);
3430 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3432 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3439 /* Fix up the flags for a symbol. This handles various cases which
3440 can only be fixed after all the input files are seen. This is
3441 currently called by both adjust_dynamic_symbol and
3442 assign_sym_version, which is unnecessary but perhaps more robust in
3443 the face of future changes. */
3446 elf_fix_symbol_flags (h
, eif
)
3447 struct elf_link_hash_entry
*h
;
3448 struct elf_info_failed
*eif
;
3450 /* If this symbol was mentioned in a non-ELF file, try to set
3451 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3452 permit a non-ELF file to correctly refer to a symbol defined in
3453 an ELF dynamic object. */
3454 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3456 while (h
->root
.type
== bfd_link_hash_indirect
)
3457 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3459 if (h
->root
.type
!= bfd_link_hash_defined
3460 && h
->root
.type
!= bfd_link_hash_defweak
)
3461 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3462 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3465 if (h
->root
.u
.def
.section
->owner
!= NULL
3466 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3467 == bfd_target_elf_flavour
))
3468 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3469 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3471 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3474 if (h
->dynindx
== -1
3475 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3476 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3478 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3487 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3488 was first seen in a non-ELF file. Fortunately, if the symbol
3489 was first seen in an ELF file, we're probably OK unless the
3490 symbol was defined in a non-ELF file. Catch that case here.
3491 FIXME: We're still in trouble if the symbol was first seen in
3492 a dynamic object, and then later in a non-ELF regular object. */
3493 if ((h
->root
.type
== bfd_link_hash_defined
3494 || h
->root
.type
== bfd_link_hash_defweak
)
3495 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3496 && (h
->root
.u
.def
.section
->owner
!= NULL
3497 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3498 != bfd_target_elf_flavour
)
3499 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3500 && (h
->elf_link_hash_flags
3501 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3502 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3505 /* If this is a final link, and the symbol was defined as a common
3506 symbol in a regular object file, and there was no definition in
3507 any dynamic object, then the linker will have allocated space for
3508 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3509 flag will not have been set. */
3510 if (h
->root
.type
== bfd_link_hash_defined
3511 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3512 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3513 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3514 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3515 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3517 /* If -Bsymbolic was used (which means to bind references to global
3518 symbols to the definition within the shared object), and this
3519 symbol was defined in a regular object, then it actually doesn't
3520 need a PLT entry. Likewise, if the symbol has any kind of
3521 visibility (internal, hidden, or protected), it doesn't need a
3523 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3524 && eif
->info
->shared
3525 && (eif
->info
->symbolic
|| ELF_ST_VISIBILITY (h
->other
))
3526 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3528 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3529 h
->plt
.offset
= (bfd_vma
) -1;
3532 /* If this is a weak defined symbol in a dynamic object, and we know
3533 the real definition in the dynamic object, copy interesting flags
3534 over to the real definition. */
3535 if (h
->weakdef
!= NULL
)
3537 struct elf_link_hash_entry
*weakdef
;
3539 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3540 || h
->root
.type
== bfd_link_hash_defweak
);
3541 weakdef
= h
->weakdef
;
3542 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3543 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3544 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3546 /* If the real definition is defined by a regular object file,
3547 don't do anything special. See the longer description in
3548 elf_adjust_dynamic_symbol, below. */
3549 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3552 weakdef
->elf_link_hash_flags
|=
3553 (h
->elf_link_hash_flags
3554 & (ELF_LINK_HASH_REF_REGULAR
3555 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3556 | ELF_LINK_NON_GOT_REF
));
3562 /* Make the backend pick a good value for a dynamic symbol. This is
3563 called via elf_link_hash_traverse, and also calls itself
3567 elf_adjust_dynamic_symbol (h
, data
)
3568 struct elf_link_hash_entry
*h
;
3571 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3573 struct elf_backend_data
*bed
;
3575 /* Ignore indirect symbols. These are added by the versioning code. */
3576 if (h
->root
.type
== bfd_link_hash_indirect
)
3579 /* Fix the symbol flags. */
3580 if (! elf_fix_symbol_flags (h
, eif
))
3583 /* If this symbol does not require a PLT entry, and it is not
3584 defined by a dynamic object, or is not referenced by a regular
3585 object, ignore it. We do have to handle a weak defined symbol,
3586 even if no regular object refers to it, if we decided to add it
3587 to the dynamic symbol table. FIXME: Do we normally need to worry
3588 about symbols which are defined by one dynamic object and
3589 referenced by another one? */
3590 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3591 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3592 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3593 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3594 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3596 h
->plt
.offset
= (bfd_vma
) -1;
3600 /* If we've already adjusted this symbol, don't do it again. This
3601 can happen via a recursive call. */
3602 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3605 /* Don't look at this symbol again. Note that we must set this
3606 after checking the above conditions, because we may look at a
3607 symbol once, decide not to do anything, and then get called
3608 recursively later after REF_REGULAR is set below. */
3609 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3611 /* If this is a weak definition, and we know a real definition, and
3612 the real symbol is not itself defined by a regular object file,
3613 then get a good value for the real definition. We handle the
3614 real symbol first, for the convenience of the backend routine.
3616 Note that there is a confusing case here. If the real definition
3617 is defined by a regular object file, we don't get the real symbol
3618 from the dynamic object, but we do get the weak symbol. If the
3619 processor backend uses a COPY reloc, then if some routine in the
3620 dynamic object changes the real symbol, we will not see that
3621 change in the corresponding weak symbol. This is the way other
3622 ELF linkers work as well, and seems to be a result of the shared
3625 I will clarify this issue. Most SVR4 shared libraries define the
3626 variable _timezone and define timezone as a weak synonym. The
3627 tzset call changes _timezone. If you write
3628 extern int timezone;
3630 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3631 you might expect that, since timezone is a synonym for _timezone,
3632 the same number will print both times. However, if the processor
3633 backend uses a COPY reloc, then actually timezone will be copied
3634 into your process image, and, since you define _timezone
3635 yourself, _timezone will not. Thus timezone and _timezone will
3636 wind up at different memory locations. The tzset call will set
3637 _timezone, leaving timezone unchanged. */
3639 if (h
->weakdef
!= NULL
)
3641 /* If we get to this point, we know there is an implicit
3642 reference by a regular object file via the weak symbol H.
3643 FIXME: Is this really true? What if the traversal finds
3644 H->WEAKDEF before it finds H? */
3645 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3647 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
3651 /* If a symbol has no type and no size and does not require a PLT
3652 entry, then we are probably about to do the wrong thing here: we
3653 are probably going to create a COPY reloc for an empty object.
3654 This case can arise when a shared object is built with assembly
3655 code, and the assembly code fails to set the symbol type. */
3657 && h
->type
== STT_NOTYPE
3658 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3659 (*_bfd_error_handler
)
3660 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3661 h
->root
.root
.string
);
3663 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3664 bed
= get_elf_backend_data (dynobj
);
3665 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3674 /* This routine is used to export all defined symbols into the dynamic
3675 symbol table. It is called via elf_link_hash_traverse. */
3678 elf_export_symbol (h
, data
)
3679 struct elf_link_hash_entry
*h
;
3682 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3684 /* Ignore indirect symbols. These are added by the versioning code. */
3685 if (h
->root
.type
== bfd_link_hash_indirect
)
3688 if (h
->dynindx
== -1
3689 && (h
->elf_link_hash_flags
3690 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3692 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3702 /* Look through the symbols which are defined in other shared
3703 libraries and referenced here. Update the list of version
3704 dependencies. This will be put into the .gnu.version_r section.
3705 This function is called via elf_link_hash_traverse. */
3708 elf_link_find_version_dependencies (h
, data
)
3709 struct elf_link_hash_entry
*h
;
3712 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3713 Elf_Internal_Verneed
*t
;
3714 Elf_Internal_Vernaux
*a
;
3716 /* We only care about symbols defined in shared objects with version
3718 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3719 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3721 || h
->verinfo
.verdef
== NULL
)
3724 /* See if we already know about this version. */
3725 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3727 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3730 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3731 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3737 /* This is a new version. Add it to tree we are building. */
3741 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3744 rinfo
->failed
= true;
3748 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3749 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3750 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3753 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3755 /* Note that we are copying a string pointer here, and testing it
3756 above. If bfd_elf_string_from_elf_section is ever changed to
3757 discard the string data when low in memory, this will have to be
3759 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3761 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3762 a
->vna_nextptr
= t
->vn_auxptr
;
3764 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3767 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3774 /* Figure out appropriate versions for all the symbols. We may not
3775 have the version number script until we have read all of the input
3776 files, so until that point we don't know which symbols should be
3777 local. This function is called via elf_link_hash_traverse. */
3780 elf_link_assign_sym_version (h
, data
)
3781 struct elf_link_hash_entry
*h
;
3784 struct elf_assign_sym_version_info
*sinfo
=
3785 (struct elf_assign_sym_version_info
*) data
;
3786 struct bfd_link_info
*info
= sinfo
->info
;
3787 struct elf_backend_data
*bed
;
3788 struct elf_info_failed eif
;
3791 /* Fix the symbol flags. */
3794 if (! elf_fix_symbol_flags (h
, &eif
))
3797 sinfo
->failed
= true;
3801 /* We only need version numbers for symbols defined in regular
3803 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3806 bed
= get_elf_backend_data (sinfo
->output_bfd
);
3807 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3808 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3810 struct bfd_elf_version_tree
*t
;
3815 /* There are two consecutive ELF_VER_CHR characters if this is
3816 not a hidden symbol. */
3818 if (*p
== ELF_VER_CHR
)
3824 /* If there is no version string, we can just return out. */
3828 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3832 /* Look for the version. If we find it, it is no longer weak. */
3833 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3835 if (strcmp (t
->name
, p
) == 0)
3839 struct bfd_elf_version_expr
*d
;
3841 len
= p
- h
->root
.root
.string
;
3842 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3845 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3846 alc
[len
- 1] = '\0';
3847 if (alc
[len
- 2] == ELF_VER_CHR
)
3848 alc
[len
- 2] = '\0';
3850 h
->verinfo
.vertree
= t
;
3854 if (t
->globals
!= NULL
)
3856 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3857 if ((*d
->match
) (d
, alc
))
3861 /* See if there is anything to force this symbol to
3863 if (d
== NULL
&& t
->locals
!= NULL
)
3865 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3867 if ((*d
->match
) (d
, alc
))
3869 if (h
->dynindx
!= -1
3871 && ! sinfo
->export_dynamic
)
3873 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3874 (*bed
->elf_backend_hide_symbol
) (info
, h
);
3875 /* FIXME: The name of the symbol has
3876 already been recorded in the dynamic
3877 string table section. */
3885 bfd_release (sinfo
->output_bfd
, alc
);
3890 /* If we are building an application, we need to create a
3891 version node for this version. */
3892 if (t
== NULL
&& ! info
->shared
)
3894 struct bfd_elf_version_tree
**pp
;
3897 /* If we aren't going to export this symbol, we don't need
3898 to worry about it. */
3899 if (h
->dynindx
== -1)
3902 t
= ((struct bfd_elf_version_tree
*)
3903 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3906 sinfo
->failed
= true;
3915 t
->name_indx
= (unsigned int) -1;
3919 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3921 t
->vernum
= version_index
;
3925 h
->verinfo
.vertree
= t
;
3929 /* We could not find the version for a symbol when
3930 generating a shared archive. Return an error. */
3931 (*_bfd_error_handler
)
3932 (_("%s: undefined versioned symbol name %s"),
3933 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3934 bfd_set_error (bfd_error_bad_value
);
3935 sinfo
->failed
= true;
3940 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3943 /* If we don't have a version for this symbol, see if we can find
3945 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3947 struct bfd_elf_version_tree
*t
;
3948 struct bfd_elf_version_tree
*deflt
;
3949 struct bfd_elf_version_expr
*d
;
3951 /* See if can find what version this symbol is in. If the
3952 symbol is supposed to be local, then don't actually register
3955 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3957 if (t
->globals
!= NULL
)
3959 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3961 if ((*d
->match
) (d
, h
->root
.root
.string
))
3963 h
->verinfo
.vertree
= t
;
3972 if (t
->locals
!= NULL
)
3974 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3976 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3978 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3980 h
->verinfo
.vertree
= t
;
3981 if (h
->dynindx
!= -1
3983 && ! sinfo
->export_dynamic
)
3985 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3986 (*bed
->elf_backend_hide_symbol
) (info
, h
);
3987 /* FIXME: The name of the symbol has already
3988 been recorded in the dynamic string table
4000 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4002 h
->verinfo
.vertree
= deflt
;
4003 if (h
->dynindx
!= -1
4005 && ! sinfo
->export_dynamic
)
4007 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
4008 (*bed
->elf_backend_hide_symbol
) (info
, h
);
4009 /* FIXME: The name of the symbol has already been
4010 recorded in the dynamic string table section. */
4018 /* Final phase of ELF linker. */
4020 /* A structure we use to avoid passing large numbers of arguments. */
4022 struct elf_final_link_info
4024 /* General link information. */
4025 struct bfd_link_info
*info
;
4028 /* Symbol string table. */
4029 struct bfd_strtab_hash
*symstrtab
;
4030 /* .dynsym section. */
4031 asection
*dynsym_sec
;
4032 /* .hash section. */
4034 /* symbol version section (.gnu.version). */
4035 asection
*symver_sec
;
4036 /* Buffer large enough to hold contents of any section. */
4038 /* Buffer large enough to hold external relocs of any section. */
4039 PTR external_relocs
;
4040 /* Buffer large enough to hold internal relocs of any section. */
4041 Elf_Internal_Rela
*internal_relocs
;
4042 /* Buffer large enough to hold external local symbols of any input
4044 Elf_External_Sym
*external_syms
;
4045 /* Buffer large enough to hold internal local symbols of any input
4047 Elf_Internal_Sym
*internal_syms
;
4048 /* Array large enough to hold a symbol index for each local symbol
4049 of any input BFD. */
4051 /* Array large enough to hold a section pointer for each local
4052 symbol of any input BFD. */
4053 asection
**sections
;
4054 /* Buffer to hold swapped out symbols. */
4055 Elf_External_Sym
*symbuf
;
4056 /* Number of swapped out symbols in buffer. */
4057 size_t symbuf_count
;
4058 /* Number of symbols which fit in symbuf. */
4062 static boolean elf_link_output_sym
4063 PARAMS ((struct elf_final_link_info
*, const char *,
4064 Elf_Internal_Sym
*, asection
*));
4065 static boolean elf_link_flush_output_syms
4066 PARAMS ((struct elf_final_link_info
*));
4067 static boolean elf_link_output_extsym
4068 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4069 static boolean elf_link_input_bfd
4070 PARAMS ((struct elf_final_link_info
*, bfd
*));
4071 static boolean elf_reloc_link_order
4072 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
4073 struct bfd_link_order
*));
4075 /* This struct is used to pass information to elf_link_output_extsym. */
4077 struct elf_outext_info
4081 struct elf_final_link_info
*finfo
;
4084 /* Compute the size of, and allocate space for, REL_HDR which is the
4085 section header for a section containing relocations for O. */
4088 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4090 Elf_Internal_Shdr
*rel_hdr
;
4093 register struct elf_link_hash_entry
**p
, **pend
;
4094 unsigned reloc_count
;
4096 /* Figure out how many relocations there will be. */
4097 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4098 reloc_count
= elf_section_data (o
)->rel_count
;
4100 reloc_count
= elf_section_data (o
)->rel_count2
;
4102 /* That allows us to calculate the size of the section. */
4103 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4105 /* The contents field must last into write_object_contents, so we
4106 allocate it with bfd_alloc rather than malloc. Also since we
4107 cannot be sure that the contents will actually be filled in,
4108 we zero the allocated space. */
4109 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4110 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4113 /* We only allocate one set of hash entries, so we only do it the
4114 first time we are called. */
4115 if (elf_section_data (o
)->rel_hashes
== NULL
)
4117 p
= ((struct elf_link_hash_entry
**)
4118 bfd_malloc (o
->reloc_count
4119 * sizeof (struct elf_link_hash_entry
*)));
4120 if (p
== NULL
&& o
->reloc_count
!= 0)
4123 elf_section_data (o
)->rel_hashes
= p
;
4124 pend
= p
+ o
->reloc_count
;
4125 for (; p
< pend
; p
++)
4132 /* When performing a relocateable link, the input relocations are
4133 preserved. But, if they reference global symbols, the indices
4134 referenced must be updated. Update all the relocations in
4135 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4138 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4140 Elf_Internal_Shdr
*rel_hdr
;
4142 struct elf_link_hash_entry
**rel_hash
;
4145 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4147 for (i
= 0; i
< count
; i
++, rel_hash
++)
4149 if (*rel_hash
== NULL
)
4152 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4154 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4156 Elf_External_Rel
*erel
;
4157 Elf_Internal_Rel irel
;
4159 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4160 if (bed
->s
->swap_reloc_in
)
4161 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, &irel
);
4163 elf_swap_reloc_in (abfd
, erel
, &irel
);
4164 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4165 ELF_R_TYPE (irel
.r_info
));
4166 if (bed
->s
->swap_reloc_out
)
4167 (*bed
->s
->swap_reloc_out
) (abfd
, &irel
, (bfd_byte
*) erel
);
4169 elf_swap_reloc_out (abfd
, &irel
, erel
);
4173 Elf_External_Rela
*erela
;
4174 Elf_Internal_Rela irela
;
4176 BFD_ASSERT (rel_hdr
->sh_entsize
4177 == sizeof (Elf_External_Rela
));
4179 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4180 if (bed
->s
->swap_reloca_in
)
4181 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, &irela
);
4183 elf_swap_reloca_in (abfd
, erela
, &irela
);
4184 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4185 ELF_R_TYPE (irela
.r_info
));
4186 if (bed
->s
->swap_reloca_out
)
4187 (*bed
->s
->swap_reloca_out
) (abfd
, &irela
, (bfd_byte
*) erela
);
4189 elf_swap_reloca_out (abfd
, &irela
, erela
);
4194 /* Do the final step of an ELF link. */
4197 elf_bfd_final_link (abfd
, info
)
4199 struct bfd_link_info
*info
;
4203 struct elf_final_link_info finfo
;
4204 register asection
*o
;
4205 register struct bfd_link_order
*p
;
4207 size_t max_contents_size
;
4208 size_t max_external_reloc_size
;
4209 size_t max_internal_reloc_count
;
4210 size_t max_sym_count
;
4212 Elf_Internal_Sym elfsym
;
4214 Elf_Internal_Shdr
*symtab_hdr
;
4215 Elf_Internal_Shdr
*symstrtab_hdr
;
4216 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4217 struct elf_outext_info eoinfo
;
4220 abfd
->flags
|= DYNAMIC
;
4222 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4223 dynobj
= elf_hash_table (info
)->dynobj
;
4226 finfo
.output_bfd
= abfd
;
4227 finfo
.symstrtab
= elf_stringtab_init ();
4228 if (finfo
.symstrtab
== NULL
)
4233 finfo
.dynsym_sec
= NULL
;
4234 finfo
.hash_sec
= NULL
;
4235 finfo
.symver_sec
= NULL
;
4239 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4240 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4241 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4242 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4243 /* Note that it is OK if symver_sec is NULL. */
4246 finfo
.contents
= NULL
;
4247 finfo
.external_relocs
= NULL
;
4248 finfo
.internal_relocs
= NULL
;
4249 finfo
.external_syms
= NULL
;
4250 finfo
.internal_syms
= NULL
;
4251 finfo
.indices
= NULL
;
4252 finfo
.sections
= NULL
;
4253 finfo
.symbuf
= NULL
;
4254 finfo
.symbuf_count
= 0;
4256 /* Count up the number of relocations we will output for each output
4257 section, so that we know the sizes of the reloc sections. We
4258 also figure out some maximum sizes. */
4259 max_contents_size
= 0;
4260 max_external_reloc_size
= 0;
4261 max_internal_reloc_count
= 0;
4263 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4267 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4269 if (p
->type
== bfd_section_reloc_link_order
4270 || p
->type
== bfd_symbol_reloc_link_order
)
4272 else if (p
->type
== bfd_indirect_link_order
)
4276 sec
= p
->u
.indirect
.section
;
4278 /* Mark all sections which are to be included in the
4279 link. This will normally be every section. We need
4280 to do this so that we can identify any sections which
4281 the linker has decided to not include. */
4282 sec
->linker_mark
= true;
4284 if (info
->relocateable
|| info
->emitrelocations
)
4285 o
->reloc_count
+= sec
->reloc_count
;
4287 if (sec
->_raw_size
> max_contents_size
)
4288 max_contents_size
= sec
->_raw_size
;
4289 if (sec
->_cooked_size
> max_contents_size
)
4290 max_contents_size
= sec
->_cooked_size
;
4292 /* We are interested in just local symbols, not all
4294 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4295 && (sec
->owner
->flags
& DYNAMIC
) == 0)
4299 if (elf_bad_symtab (sec
->owner
))
4300 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4301 / sizeof (Elf_External_Sym
));
4303 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
4305 if (sym_count
> max_sym_count
)
4306 max_sym_count
= sym_count
;
4308 if ((sec
->flags
& SEC_RELOC
) != 0)
4312 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
4313 if (ext_size
> max_external_reloc_size
)
4314 max_external_reloc_size
= ext_size
;
4315 if (sec
->reloc_count
> max_internal_reloc_count
)
4316 max_internal_reloc_count
= sec
->reloc_count
;
4322 if (o
->reloc_count
> 0)
4323 o
->flags
|= SEC_RELOC
;
4326 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4327 set it (this is probably a bug) and if it is set
4328 assign_section_numbers will create a reloc section. */
4329 o
->flags
&=~ SEC_RELOC
;
4332 /* If the SEC_ALLOC flag is not set, force the section VMA to
4333 zero. This is done in elf_fake_sections as well, but forcing
4334 the VMA to 0 here will ensure that relocs against these
4335 sections are handled correctly. */
4336 if ((o
->flags
& SEC_ALLOC
) == 0
4337 && ! o
->user_set_vma
)
4341 /* Figure out the file positions for everything but the symbol table
4342 and the relocs. We set symcount to force assign_section_numbers
4343 to create a symbol table. */
4344 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
4345 BFD_ASSERT (! abfd
->output_has_begun
);
4346 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
4349 /* Figure out how many relocations we will have in each section.
4350 Just using RELOC_COUNT isn't good enough since that doesn't
4351 maintain a separate value for REL vs. RELA relocations. */
4352 if (info
->relocateable
|| info
->emitrelocations
)
4353 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4354 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4356 asection
*output_section
;
4358 if (! o
->linker_mark
)
4360 /* This section was omitted from the link. */
4364 output_section
= o
->output_section
;
4366 if (output_section
!= NULL
4367 && (o
->flags
& SEC_RELOC
) != 0)
4369 struct bfd_elf_section_data
*esdi
4370 = elf_section_data (o
);
4371 struct bfd_elf_section_data
*esdo
4372 = elf_section_data (output_section
);
4373 unsigned int *rel_count
;
4374 unsigned int *rel_count2
;
4376 /* We must be careful to add the relocation froms the
4377 input section to the right output count. */
4378 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
4380 rel_count
= &esdo
->rel_count
;
4381 rel_count2
= &esdo
->rel_count2
;
4385 rel_count
= &esdo
->rel_count2
;
4386 rel_count2
= &esdo
->rel_count
;
4389 *rel_count
+= (esdi
->rel_hdr
.sh_size
4390 / esdi
->rel_hdr
.sh_entsize
);
4392 *rel_count2
+= (esdi
->rel_hdr2
->sh_size
4393 / esdi
->rel_hdr2
->sh_entsize
);
4397 /* That created the reloc sections. Set their sizes, and assign
4398 them file positions, and allocate some buffers. */
4399 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4401 if ((o
->flags
& SEC_RELOC
) != 0)
4403 if (!elf_link_size_reloc_section (abfd
,
4404 &elf_section_data (o
)->rel_hdr
,
4408 if (elf_section_data (o
)->rel_hdr2
4409 && !elf_link_size_reloc_section (abfd
,
4410 elf_section_data (o
)->rel_hdr2
,
4415 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4416 to count upwards while actually outputting the relocations. */
4417 elf_section_data (o
)->rel_count
= 0;
4418 elf_section_data (o
)->rel_count2
= 0;
4421 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4423 /* We have now assigned file positions for all the sections except
4424 .symtab and .strtab. We start the .symtab section at the current
4425 file position, and write directly to it. We build the .strtab
4426 section in memory. */
4427 bfd_get_symcount (abfd
) = 0;
4428 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4429 /* sh_name is set in prep_headers. */
4430 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4431 symtab_hdr
->sh_flags
= 0;
4432 symtab_hdr
->sh_addr
= 0;
4433 symtab_hdr
->sh_size
= 0;
4434 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4435 /* sh_link is set in assign_section_numbers. */
4436 /* sh_info is set below. */
4437 /* sh_offset is set just below. */
4438 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4440 off
= elf_tdata (abfd
)->next_file_pos
;
4441 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4443 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4444 incorrect. We do not yet know the size of the .symtab section.
4445 We correct next_file_pos below, after we do know the size. */
4447 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4448 continuously seeking to the right position in the file. */
4449 if (! info
->keep_memory
|| max_sym_count
< 20)
4450 finfo
.symbuf_size
= 20;
4452 finfo
.symbuf_size
= max_sym_count
;
4453 finfo
.symbuf
= ((Elf_External_Sym
*)
4454 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4455 if (finfo
.symbuf
== NULL
)
4458 /* Start writing out the symbol table. The first symbol is always a
4460 if (info
->strip
!= strip_all
|| info
->relocateable
|| info
->emitrelocations
)
4462 elfsym
.st_value
= 0;
4465 elfsym
.st_other
= 0;
4466 elfsym
.st_shndx
= SHN_UNDEF
;
4467 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4468 &elfsym
, bfd_und_section_ptr
))
4473 /* Some standard ELF linkers do this, but we don't because it causes
4474 bootstrap comparison failures. */
4475 /* Output a file symbol for the output file as the second symbol.
4476 We output this even if we are discarding local symbols, although
4477 I'm not sure if this is correct. */
4478 elfsym
.st_value
= 0;
4480 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4481 elfsym
.st_other
= 0;
4482 elfsym
.st_shndx
= SHN_ABS
;
4483 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4484 &elfsym
, bfd_abs_section_ptr
))
4488 /* Output a symbol for each section. We output these even if we are
4489 discarding local symbols, since they are used for relocs. These
4490 symbols have no names. We store the index of each one in the
4491 index field of the section, so that we can find it again when
4492 outputting relocs. */
4493 if (info
->strip
!= strip_all
|| info
->relocateable
|| info
->emitrelocations
)
4496 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4497 elfsym
.st_other
= 0;
4498 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4500 o
= section_from_elf_index (abfd
, i
);
4502 o
->target_index
= bfd_get_symcount (abfd
);
4503 elfsym
.st_shndx
= i
;
4504 if (info
->relocateable
|| o
== NULL
)
4505 elfsym
.st_value
= 0;
4507 elfsym
.st_value
= o
->vma
;
4508 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4514 /* Allocate some memory to hold information read in from the input
4516 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4517 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4518 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4519 bfd_malloc (max_internal_reloc_count
4520 * sizeof (Elf_Internal_Rela
)
4521 * bed
->s
->int_rels_per_ext_rel
));
4522 finfo
.external_syms
= ((Elf_External_Sym
*)
4523 bfd_malloc (max_sym_count
4524 * sizeof (Elf_External_Sym
)));
4525 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4526 bfd_malloc (max_sym_count
4527 * sizeof (Elf_Internal_Sym
)));
4528 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4529 finfo
.sections
= ((asection
**)
4530 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4531 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4532 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4533 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4534 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4535 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4536 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4537 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4540 /* Since ELF permits relocations to be against local symbols, we
4541 must have the local symbols available when we do the relocations.
4542 Since we would rather only read the local symbols once, and we
4543 would rather not keep them in memory, we handle all the
4544 relocations for a single input file at the same time.
4546 Unfortunately, there is no way to know the total number of local
4547 symbols until we have seen all of them, and the local symbol
4548 indices precede the global symbol indices. This means that when
4549 we are generating relocateable output, and we see a reloc against
4550 a global symbol, we can not know the symbol index until we have
4551 finished examining all the local symbols to see which ones we are
4552 going to output. To deal with this, we keep the relocations in
4553 memory, and don't output them until the end of the link. This is
4554 an unfortunate waste of memory, but I don't see a good way around
4555 it. Fortunately, it only happens when performing a relocateable
4556 link, which is not the common case. FIXME: If keep_memory is set
4557 we could write the relocs out and then read them again; I don't
4558 know how bad the memory loss will be. */
4560 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4561 sub
->output_has_begun
= false;
4562 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4564 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4566 if (p
->type
== bfd_indirect_link_order
4567 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4568 == bfd_target_elf_flavour
))
4570 sub
= p
->u
.indirect
.section
->owner
;
4571 if (! sub
->output_has_begun
)
4573 if (! elf_link_input_bfd (&finfo
, sub
))
4575 sub
->output_has_begun
= true;
4578 else if (p
->type
== bfd_section_reloc_link_order
4579 || p
->type
== bfd_symbol_reloc_link_order
)
4581 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4586 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4592 /* That wrote out all the local symbols. Finish up the symbol table
4593 with the global symbols. Even if we want to strip everything we
4594 can, we still need to deal with those global symbols that got
4595 converted to local in a version script. */
4599 /* Output any global symbols that got converted to local in a
4600 version script. We do this in a separate step since ELF
4601 requires all local symbols to appear prior to any global
4602 symbols. FIXME: We should only do this if some global
4603 symbols were, in fact, converted to become local. FIXME:
4604 Will this work correctly with the Irix 5 linker? */
4605 eoinfo
.failed
= false;
4606 eoinfo
.finfo
= &finfo
;
4607 eoinfo
.localsyms
= true;
4608 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4614 /* The sh_info field records the index of the first non local symbol. */
4615 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4618 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
4620 Elf_Internal_Sym sym
;
4621 Elf_External_Sym
*dynsym
=
4622 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4623 long last_local
= 0;
4625 /* Write out the section symbols for the output sections. */
4632 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4635 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4638 indx
= elf_section_data (s
)->this_idx
;
4639 BFD_ASSERT (indx
> 0);
4640 sym
.st_shndx
= indx
;
4641 sym
.st_value
= s
->vma
;
4643 elf_swap_symbol_out (abfd
, &sym
,
4644 dynsym
+ elf_section_data (s
)->dynindx
);
4647 last_local
= bfd_count_sections (abfd
);
4650 /* Write out the local dynsyms. */
4651 if (elf_hash_table (info
)->dynlocal
)
4653 struct elf_link_local_dynamic_entry
*e
;
4654 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4658 sym
.st_size
= e
->isym
.st_size
;
4659 sym
.st_other
= e
->isym
.st_other
;
4661 /* Copy the internal symbol as is.
4662 Note that we saved a word of storage and overwrote
4663 the original st_name with the dynstr_index. */
4666 if (e
->isym
.st_shndx
> 0 && e
->isym
.st_shndx
< SHN_LORESERVE
)
4668 s
= bfd_section_from_elf_index (e
->input_bfd
,
4672 elf_section_data (s
->output_section
)->this_idx
;
4673 sym
.st_value
= (s
->output_section
->vma
4675 + e
->isym
.st_value
);
4678 if (last_local
< e
->dynindx
)
4679 last_local
= e
->dynindx
;
4681 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4685 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
4689 /* We get the global symbols from the hash table. */
4690 eoinfo
.failed
= false;
4691 eoinfo
.localsyms
= false;
4692 eoinfo
.finfo
= &finfo
;
4693 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4698 /* If backend needs to output some symbols not present in the hash
4699 table, do it now. */
4700 if (bed
->elf_backend_output_arch_syms
)
4702 if (! (*bed
->elf_backend_output_arch_syms
)
4703 (abfd
, info
, (PTR
) &finfo
,
4704 (boolean (*) PARAMS ((PTR
, const char *,
4705 Elf_Internal_Sym
*, asection
*)))
4706 elf_link_output_sym
))
4710 /* Flush all symbols to the file. */
4711 if (! elf_link_flush_output_syms (&finfo
))
4714 /* Now we know the size of the symtab section. */
4715 off
+= symtab_hdr
->sh_size
;
4717 /* Finish up and write out the symbol string table (.strtab)
4719 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4720 /* sh_name was set in prep_headers. */
4721 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4722 symstrtab_hdr
->sh_flags
= 0;
4723 symstrtab_hdr
->sh_addr
= 0;
4724 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4725 symstrtab_hdr
->sh_entsize
= 0;
4726 symstrtab_hdr
->sh_link
= 0;
4727 symstrtab_hdr
->sh_info
= 0;
4728 /* sh_offset is set just below. */
4729 symstrtab_hdr
->sh_addralign
= 1;
4731 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4732 elf_tdata (abfd
)->next_file_pos
= off
;
4734 if (bfd_get_symcount (abfd
) > 0)
4736 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4737 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4741 /* Adjust the relocs to have the correct symbol indices. */
4742 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4744 if ((o
->flags
& SEC_RELOC
) == 0)
4747 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4748 elf_section_data (o
)->rel_count
,
4749 elf_section_data (o
)->rel_hashes
);
4750 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4751 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4752 elf_section_data (o
)->rel_count2
,
4753 (elf_section_data (o
)->rel_hashes
4754 + elf_section_data (o
)->rel_count
));
4756 /* Set the reloc_count field to 0 to prevent write_relocs from
4757 trying to swap the relocs out itself. */
4761 /* If we are linking against a dynamic object, or generating a
4762 shared library, finish up the dynamic linking information. */
4765 Elf_External_Dyn
*dyncon
, *dynconend
;
4767 /* Fix up .dynamic entries. */
4768 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4769 BFD_ASSERT (o
!= NULL
);
4771 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4772 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4773 for (; dyncon
< dynconend
; dyncon
++)
4775 Elf_Internal_Dyn dyn
;
4779 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4786 name
= info
->init_function
;
4789 name
= info
->fini_function
;
4792 struct elf_link_hash_entry
*h
;
4794 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4795 false, false, true);
4797 && (h
->root
.type
== bfd_link_hash_defined
4798 || h
->root
.type
== bfd_link_hash_defweak
))
4800 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4801 o
= h
->root
.u
.def
.section
;
4802 if (o
->output_section
!= NULL
)
4803 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4804 + o
->output_offset
);
4807 /* The symbol is imported from another shared
4808 library and does not apply to this one. */
4812 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4827 name
= ".gnu.version_d";
4830 name
= ".gnu.version_r";
4833 name
= ".gnu.version";
4835 o
= bfd_get_section_by_name (abfd
, name
);
4836 BFD_ASSERT (o
!= NULL
);
4837 dyn
.d_un
.d_ptr
= o
->vma
;
4838 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4845 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4850 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4852 Elf_Internal_Shdr
*hdr
;
4854 hdr
= elf_elfsections (abfd
)[i
];
4855 if (hdr
->sh_type
== type
4856 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4858 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4859 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4862 if (dyn
.d_un
.d_val
== 0
4863 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4864 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4868 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4874 /* If we have created any dynamic sections, then output them. */
4877 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4880 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4882 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4883 || o
->_raw_size
== 0
4884 || o
->output_section
== bfd_abs_section_ptr
)
4886 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4888 /* At this point, we are only interested in sections
4889 created by elf_link_create_dynamic_sections. */
4892 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4894 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4896 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4897 o
->contents
, o
->output_offset
,
4905 /* The contents of the .dynstr section are actually in a
4907 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4908 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4909 || ! _bfd_stringtab_emit (abfd
,
4910 elf_hash_table (info
)->dynstr
))
4916 /* If we have optimized stabs strings, output them. */
4917 if (elf_hash_table (info
)->stab_info
!= NULL
)
4919 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4923 if (finfo
.symstrtab
!= NULL
)
4924 _bfd_stringtab_free (finfo
.symstrtab
);
4925 if (finfo
.contents
!= NULL
)
4926 free (finfo
.contents
);
4927 if (finfo
.external_relocs
!= NULL
)
4928 free (finfo
.external_relocs
);
4929 if (finfo
.internal_relocs
!= NULL
)
4930 free (finfo
.internal_relocs
);
4931 if (finfo
.external_syms
!= NULL
)
4932 free (finfo
.external_syms
);
4933 if (finfo
.internal_syms
!= NULL
)
4934 free (finfo
.internal_syms
);
4935 if (finfo
.indices
!= NULL
)
4936 free (finfo
.indices
);
4937 if (finfo
.sections
!= NULL
)
4938 free (finfo
.sections
);
4939 if (finfo
.symbuf
!= NULL
)
4940 free (finfo
.symbuf
);
4941 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4943 if ((o
->flags
& SEC_RELOC
) != 0
4944 && elf_section_data (o
)->rel_hashes
!= NULL
)
4945 free (elf_section_data (o
)->rel_hashes
);
4948 elf_tdata (abfd
)->linker
= true;
4953 if (finfo
.symstrtab
!= NULL
)
4954 _bfd_stringtab_free (finfo
.symstrtab
);
4955 if (finfo
.contents
!= NULL
)
4956 free (finfo
.contents
);
4957 if (finfo
.external_relocs
!= NULL
)
4958 free (finfo
.external_relocs
);
4959 if (finfo
.internal_relocs
!= NULL
)
4960 free (finfo
.internal_relocs
);
4961 if (finfo
.external_syms
!= NULL
)
4962 free (finfo
.external_syms
);
4963 if (finfo
.internal_syms
!= NULL
)
4964 free (finfo
.internal_syms
);
4965 if (finfo
.indices
!= NULL
)
4966 free (finfo
.indices
);
4967 if (finfo
.sections
!= NULL
)
4968 free (finfo
.sections
);
4969 if (finfo
.symbuf
!= NULL
)
4970 free (finfo
.symbuf
);
4971 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4973 if ((o
->flags
& SEC_RELOC
) != 0
4974 && elf_section_data (o
)->rel_hashes
!= NULL
)
4975 free (elf_section_data (o
)->rel_hashes
);
4981 /* Add a symbol to the output symbol table. */
4984 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4985 struct elf_final_link_info
*finfo
;
4987 Elf_Internal_Sym
*elfsym
;
4988 asection
*input_sec
;
4990 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4991 struct bfd_link_info
*info
,
4996 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4997 elf_backend_link_output_symbol_hook
;
4998 if (output_symbol_hook
!= NULL
)
5000 if (! ((*output_symbol_hook
)
5001 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
5005 if (name
== (const char *) NULL
|| *name
== '\0')
5006 elfsym
->st_name
= 0;
5007 else if (input_sec
->flags
& SEC_EXCLUDE
)
5008 elfsym
->st_name
= 0;
5011 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5014 if (elfsym
->st_name
== (unsigned long) -1)
5018 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5020 if (! elf_link_flush_output_syms (finfo
))
5024 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
5025 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
5026 ++finfo
->symbuf_count
;
5028 ++ bfd_get_symcount (finfo
->output_bfd
);
5033 /* Flush the output symbols to the file. */
5036 elf_link_flush_output_syms (finfo
)
5037 struct elf_final_link_info
*finfo
;
5039 if (finfo
->symbuf_count
> 0)
5041 Elf_Internal_Shdr
*symtab
;
5043 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5045 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
5047 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
5048 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
5049 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
5052 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
5054 finfo
->symbuf_count
= 0;
5060 /* Add an external symbol to the symbol table. This is called from
5061 the hash table traversal routine. When generating a shared object,
5062 we go through the symbol table twice. The first time we output
5063 anything that might have been forced to local scope in a version
5064 script. The second time we output the symbols that are still
5068 elf_link_output_extsym (h
, data
)
5069 struct elf_link_hash_entry
*h
;
5072 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
5073 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5075 Elf_Internal_Sym sym
;
5076 asection
*input_sec
;
5078 /* Decide whether to output this symbol in this pass. */
5079 if (eoinfo
->localsyms
)
5081 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5086 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5090 /* If we are not creating a shared library, and this symbol is
5091 referenced by a shared library but is not defined anywhere, then
5092 warn that it is undefined. If we do not do this, the runtime
5093 linker will complain that the symbol is undefined when the
5094 program is run. We don't have to worry about symbols that are
5095 referenced by regular files, because we will already have issued
5096 warnings for them. */
5097 if (! finfo
->info
->relocateable
5098 && ! (finfo
->info
->shared
5099 && !finfo
->info
->no_undefined
)
5100 && h
->root
.type
== bfd_link_hash_undefined
5101 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5102 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5104 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5105 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5106 (asection
*) NULL
, 0, true)))
5108 eoinfo
->failed
= true;
5113 /* We don't want to output symbols that have never been mentioned by
5114 a regular file, or that we have been told to strip. However, if
5115 h->indx is set to -2, the symbol is used by a reloc and we must
5119 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
5120 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
5121 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
5122 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5124 else if (finfo
->info
->strip
== strip_all
5125 || (finfo
->info
->strip
== strip_some
5126 && bfd_hash_lookup (finfo
->info
->keep_hash
,
5127 h
->root
.root
.string
,
5128 false, false) == NULL
))
5133 /* If we're stripping it, and it's not a dynamic symbol, there's
5134 nothing else to do unless it is a forced local symbol. */
5137 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5141 sym
.st_size
= h
->size
;
5142 sym
.st_other
= h
->other
;
5143 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5144 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
5145 else if (h
->root
.type
== bfd_link_hash_undefweak
5146 || h
->root
.type
== bfd_link_hash_defweak
)
5147 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
5149 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
5151 switch (h
->root
.type
)
5154 case bfd_link_hash_new
:
5158 case bfd_link_hash_undefined
:
5159 input_sec
= bfd_und_section_ptr
;
5160 sym
.st_shndx
= SHN_UNDEF
;
5163 case bfd_link_hash_undefweak
:
5164 input_sec
= bfd_und_section_ptr
;
5165 sym
.st_shndx
= SHN_UNDEF
;
5168 case bfd_link_hash_defined
:
5169 case bfd_link_hash_defweak
:
5171 input_sec
= h
->root
.u
.def
.section
;
5172 if (input_sec
->output_section
!= NULL
)
5175 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
5176 input_sec
->output_section
);
5177 if (sym
.st_shndx
== (unsigned short) -1)
5179 (*_bfd_error_handler
)
5180 (_("%s: could not find output section %s for input section %s"),
5181 bfd_get_filename (finfo
->output_bfd
),
5182 input_sec
->output_section
->name
,
5184 eoinfo
->failed
= true;
5188 /* ELF symbols in relocateable files are section relative,
5189 but in nonrelocateable files they are virtual
5191 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
5192 if (! finfo
->info
->relocateable
)
5193 sym
.st_value
+= input_sec
->output_section
->vma
;
5197 BFD_ASSERT (input_sec
->owner
== NULL
5198 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
5199 sym
.st_shndx
= SHN_UNDEF
;
5200 input_sec
= bfd_und_section_ptr
;
5205 case bfd_link_hash_common
:
5206 input_sec
= h
->root
.u
.c
.p
->section
;
5207 sym
.st_shndx
= SHN_COMMON
;
5208 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
5211 case bfd_link_hash_indirect
:
5212 /* These symbols are created by symbol versioning. They point
5213 to the decorated version of the name. For example, if the
5214 symbol foo@@GNU_1.2 is the default, which should be used when
5215 foo is used with no version, then we add an indirect symbol
5216 foo which points to foo@@GNU_1.2. We ignore these symbols,
5217 since the indirected symbol is already in the hash table. */
5220 case bfd_link_hash_warning
:
5221 /* We can't represent these symbols in ELF, although a warning
5222 symbol may have come from a .gnu.warning.SYMBOL section. We
5223 just put the target symbol in the hash table. If the target
5224 symbol does not really exist, don't do anything. */
5225 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
5227 return (elf_link_output_extsym
5228 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
5231 /* Give the processor backend a chance to tweak the symbol value,
5232 and also to finish up anything that needs to be done for this
5234 if ((h
->dynindx
!= -1
5235 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5236 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5238 struct elf_backend_data
*bed
;
5240 bed
= get_elf_backend_data (finfo
->output_bfd
);
5241 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
5242 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
5244 eoinfo
->failed
= true;
5249 /* If we are marking the symbol as undefined, and there are no
5250 non-weak references to this symbol from a regular object, then
5251 mark the symbol as weak undefined; if there are non-weak
5252 references, mark the symbol as strong. We can't do this earlier,
5253 because it might not be marked as undefined until the
5254 finish_dynamic_symbol routine gets through with it. */
5255 if (sym
.st_shndx
== SHN_UNDEF
5256 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
5257 && (ELF_ST_BIND(sym
.st_info
) == STB_GLOBAL
5258 || ELF_ST_BIND(sym
.st_info
) == STB_WEAK
))
5262 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
5263 bindtype
= STB_GLOBAL
;
5265 bindtype
= STB_WEAK
;
5266 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
5269 /* If a symbol is not defined locally, we clear the visibility
5271 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5272 sym
.st_other
^= ELF_ST_VISIBILITY(sym
.st_other
);
5274 /* If this symbol should be put in the .dynsym section, then put it
5275 there now. We have already know the symbol index. We also fill
5276 in the entry in the .hash section. */
5277 if (h
->dynindx
!= -1
5278 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5282 size_t hash_entry_size
;
5283 bfd_byte
*bucketpos
;
5286 sym
.st_name
= h
->dynstr_index
;
5288 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
5289 (PTR
) (((Elf_External_Sym
*)
5290 finfo
->dynsym_sec
->contents
)
5293 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
5294 bucket
= h
->elf_hash_value
% bucketcount
;
5296 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
5297 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
5298 + (bucket
+ 2) * hash_entry_size
);
5299 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
5300 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
5301 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
5302 ((bfd_byte
*) finfo
->hash_sec
->contents
5303 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
5305 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
5307 Elf_Internal_Versym iversym
;
5309 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5311 if (h
->verinfo
.verdef
== NULL
)
5312 iversym
.vs_vers
= 0;
5314 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
5318 if (h
->verinfo
.vertree
== NULL
)
5319 iversym
.vs_vers
= 1;
5321 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
5324 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
5325 iversym
.vs_vers
|= VERSYM_HIDDEN
;
5327 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
5328 (((Elf_External_Versym
*)
5329 finfo
->symver_sec
->contents
)
5334 /* If we're stripping it, then it was just a dynamic symbol, and
5335 there's nothing else to do. */
5339 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
5341 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
5343 eoinfo
->failed
= true;
5350 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5351 originated from the section given by INPUT_REL_HDR) to the
5355 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
5358 asection
*input_section
;
5359 Elf_Internal_Shdr
*input_rel_hdr
;
5360 Elf_Internal_Rela
*internal_relocs
;
5362 Elf_Internal_Rela
*irela
;
5363 Elf_Internal_Rela
*irelaend
;
5364 Elf_Internal_Shdr
*output_rel_hdr
;
5365 asection
*output_section
;
5366 unsigned int *rel_countp
= NULL
;
5367 struct elf_backend_data
*bed
;
5369 output_section
= input_section
->output_section
;
5370 output_rel_hdr
= NULL
;
5372 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
5373 == input_rel_hdr
->sh_entsize
)
5375 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5376 rel_countp
= &elf_section_data (output_section
)->rel_count
;
5378 else if (elf_section_data (output_section
)->rel_hdr2
5379 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
5380 == input_rel_hdr
->sh_entsize
))
5382 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
5383 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
5386 BFD_ASSERT (output_rel_hdr
!= NULL
);
5388 bed
= get_elf_backend_data (output_bfd
);
5389 irela
= internal_relocs
;
5390 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5391 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5393 Elf_External_Rel
*erel
;
5395 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
5396 for (; irela
< irelaend
; irela
++, erel
++)
5398 Elf_Internal_Rel irel
;
5400 irel
.r_offset
= irela
->r_offset
;
5401 irel
.r_info
= irela
->r_info
;
5402 BFD_ASSERT (irela
->r_addend
== 0);
5403 if (bed
->s
->swap_reloc_out
)
5404 (*bed
->s
->swap_reloc_out
) (output_bfd
, &irel
, (PTR
) erel
);
5406 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5411 Elf_External_Rela
*erela
;
5413 BFD_ASSERT (input_rel_hdr
->sh_entsize
5414 == sizeof (Elf_External_Rela
));
5415 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
5416 for (; irela
< irelaend
; irela
++, erela
++)
5417 if (bed
->s
->swap_reloca_out
)
5418 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (PTR
) erela
);
5420 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5423 /* Bump the counter, so that we know where to add the next set of
5425 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5428 /* Link an input file into the linker output file. This function
5429 handles all the sections and relocations of the input file at once.
5430 This is so that we only have to read the local symbols once, and
5431 don't have to keep them in memory. */
5434 elf_link_input_bfd (finfo
, input_bfd
)
5435 struct elf_final_link_info
*finfo
;
5438 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
5439 bfd
*, asection
*, bfd_byte
*,
5440 Elf_Internal_Rela
*,
5441 Elf_Internal_Sym
*, asection
**));
5443 Elf_Internal_Shdr
*symtab_hdr
;
5446 Elf_External_Sym
*external_syms
;
5447 Elf_External_Sym
*esym
;
5448 Elf_External_Sym
*esymend
;
5449 Elf_Internal_Sym
*isym
;
5451 asection
**ppsection
;
5453 struct elf_backend_data
*bed
;
5455 output_bfd
= finfo
->output_bfd
;
5456 bed
= get_elf_backend_data (output_bfd
);
5457 relocate_section
= bed
->elf_backend_relocate_section
;
5459 /* If this is a dynamic object, we don't want to do anything here:
5460 we don't want the local symbols, and we don't want the section
5462 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5465 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5466 if (elf_bad_symtab (input_bfd
))
5468 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5473 locsymcount
= symtab_hdr
->sh_info
;
5474 extsymoff
= symtab_hdr
->sh_info
;
5477 /* Read the local symbols. */
5478 if (symtab_hdr
->contents
!= NULL
)
5479 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5480 else if (locsymcount
== 0)
5481 external_syms
= NULL
;
5484 external_syms
= finfo
->external_syms
;
5485 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5486 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5487 locsymcount
, input_bfd
)
5488 != locsymcount
* sizeof (Elf_External_Sym
)))
5492 /* Swap in the local symbols and write out the ones which we know
5493 are going into the output file. */
5494 esym
= external_syms
;
5495 esymend
= esym
+ locsymcount
;
5496 isym
= finfo
->internal_syms
;
5497 pindex
= finfo
->indices
;
5498 ppsection
= finfo
->sections
;
5499 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5503 Elf_Internal_Sym osym
;
5505 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5508 if (elf_bad_symtab (input_bfd
))
5510 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5517 if (isym
->st_shndx
== SHN_UNDEF
)
5518 isec
= bfd_und_section_ptr
;
5519 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5520 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5521 else if (isym
->st_shndx
== SHN_ABS
)
5522 isec
= bfd_abs_section_ptr
;
5523 else if (isym
->st_shndx
== SHN_COMMON
)
5524 isec
= bfd_com_section_ptr
;
5533 /* Don't output the first, undefined, symbol. */
5534 if (esym
== external_syms
)
5537 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5541 /* Save away all section symbol values. */
5543 isec
->symbol
->value
= isym
->st_value
;
5545 /* If this is a discarded link-once section symbol, update
5546 it's value to that of the kept section symbol. The
5547 linker will keep the first of any matching link-once
5548 sections, so we should have already seen it's section
5549 symbol. I trust no-one will have the bright idea of
5550 re-ordering the bfd list... */
5552 && (bfd_get_section_flags (input_bfd
, isec
) & SEC_LINK_ONCE
) != 0
5553 && (ksec
= isec
->kept_section
) != NULL
)
5555 isym
->st_value
= ksec
->symbol
->value
;
5557 /* That put the value right, but the section info is all
5558 wrong. I hope this works. */
5559 isec
->output_offset
= ksec
->output_offset
;
5560 isec
->output_section
= ksec
->output_section
;
5563 /* We never output section symbols. Instead, we use the
5564 section symbol of the corresponding section in the output
5569 /* If we are stripping all symbols, we don't want to output this
5571 if (finfo
->info
->strip
== strip_all
)
5574 /* If we are discarding all local symbols, we don't want to
5575 output this one. If we are generating a relocateable output
5576 file, then some of the local symbols may be required by
5577 relocs; we output them below as we discover that they are
5579 if (finfo
->info
->discard
== discard_all
)
5582 /* If this symbol is defined in a section which we are
5583 discarding, we don't need to keep it, but note that
5584 linker_mark is only reliable for sections that have contents.
5585 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5586 as well as linker_mark. */
5587 if (isym
->st_shndx
> 0
5588 && isym
->st_shndx
< SHN_LORESERVE
5590 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5591 || (! finfo
->info
->relocateable
5592 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5595 /* Get the name of the symbol. */
5596 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5601 /* See if we are discarding symbols with this name. */
5602 if ((finfo
->info
->strip
== strip_some
5603 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5605 || (finfo
->info
->discard
== discard_l
5606 && bfd_is_local_label_name (input_bfd
, name
)))
5609 /* If we get here, we are going to output this symbol. */
5613 /* Adjust the section index for the output file. */
5614 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5615 isec
->output_section
);
5616 if (osym
.st_shndx
== (unsigned short) -1)
5619 *pindex
= bfd_get_symcount (output_bfd
);
5621 /* ELF symbols in relocateable files are section relative, but
5622 in executable files they are virtual addresses. Note that
5623 this code assumes that all ELF sections have an associated
5624 BFD section with a reasonable value for output_offset; below
5625 we assume that they also have a reasonable value for
5626 output_section. Any special sections must be set up to meet
5627 these requirements. */
5628 osym
.st_value
+= isec
->output_offset
;
5629 if (! finfo
->info
->relocateable
)
5630 osym
.st_value
+= isec
->output_section
->vma
;
5632 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5636 /* Relocate the contents of each section. */
5637 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5641 if (! o
->linker_mark
)
5643 /* This section was omitted from the link. */
5647 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5648 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5651 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5653 /* Section was created by elf_link_create_dynamic_sections
5658 /* Get the contents of the section. They have been cached by a
5659 relaxation routine. Note that o is a section in an input
5660 file, so the contents field will not have been set by any of
5661 the routines which work on output files. */
5662 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5663 contents
= elf_section_data (o
)->this_hdr
.contents
;
5666 contents
= finfo
->contents
;
5667 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5668 (file_ptr
) 0, o
->_raw_size
))
5672 if ((o
->flags
& SEC_RELOC
) != 0)
5674 Elf_Internal_Rela
*internal_relocs
;
5676 /* Get the swapped relocs. */
5677 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5678 (input_bfd
, o
, finfo
->external_relocs
,
5679 finfo
->internal_relocs
, false));
5680 if (internal_relocs
== NULL
5681 && o
->reloc_count
> 0)
5684 /* Relocate the section by invoking a back end routine.
5686 The back end routine is responsible for adjusting the
5687 section contents as necessary, and (if using Rela relocs
5688 and generating a relocateable output file) adjusting the
5689 reloc addend as necessary.
5691 The back end routine does not have to worry about setting
5692 the reloc address or the reloc symbol index.
5694 The back end routine is given a pointer to the swapped in
5695 internal symbols, and can access the hash table entries
5696 for the external symbols via elf_sym_hashes (input_bfd).
5698 When generating relocateable output, the back end routine
5699 must handle STB_LOCAL/STT_SECTION symbols specially. The
5700 output symbol is going to be a section symbol
5701 corresponding to the output section, which will require
5702 the addend to be adjusted. */
5704 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5705 input_bfd
, o
, contents
,
5707 finfo
->internal_syms
,
5711 if (finfo
->info
->relocateable
|| finfo
->info
->emitrelocations
)
5713 Elf_Internal_Rela
*irela
;
5714 Elf_Internal_Rela
*irelaend
;
5715 struct elf_link_hash_entry
**rel_hash
;
5716 Elf_Internal_Shdr
*input_rel_hdr
;
5718 /* Adjust the reloc addresses and symbol indices. */
5720 irela
= internal_relocs
;
5722 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5723 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5724 + elf_section_data (o
->output_section
)->rel_count
5725 + elf_section_data (o
->output_section
)->rel_count2
);
5726 for (; irela
< irelaend
; irela
++, rel_hash
++)
5728 unsigned long r_symndx
;
5729 Elf_Internal_Sym
*isym
;
5732 irela
->r_offset
+= o
->output_offset
;
5734 /* Relocs in an executable have to be virtual addresses. */
5735 if (finfo
->info
->emitrelocations
)
5736 irela
->r_offset
+= o
->output_section
->vma
;
5738 r_symndx
= ELF_R_SYM (irela
->r_info
);
5743 if (r_symndx
>= locsymcount
5744 || (elf_bad_symtab (input_bfd
)
5745 && finfo
->sections
[r_symndx
] == NULL
))
5747 struct elf_link_hash_entry
*rh
;
5750 /* This is a reloc against a global symbol. We
5751 have not yet output all the local symbols, so
5752 we do not know the symbol index of any global
5753 symbol. We set the rel_hash entry for this
5754 reloc to point to the global hash table entry
5755 for this symbol. The symbol index is then
5756 set at the end of elf_bfd_final_link. */
5757 indx
= r_symndx
- extsymoff
;
5758 rh
= elf_sym_hashes (input_bfd
)[indx
];
5759 while (rh
->root
.type
== bfd_link_hash_indirect
5760 || rh
->root
.type
== bfd_link_hash_warning
)
5761 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5763 /* Setting the index to -2 tells
5764 elf_link_output_extsym that this symbol is
5766 BFD_ASSERT (rh
->indx
< 0);
5774 /* This is a reloc against a local symbol. */
5777 isym
= finfo
->internal_syms
+ r_symndx
;
5778 sec
= finfo
->sections
[r_symndx
];
5779 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5781 /* I suppose the backend ought to fill in the
5782 section of any STT_SECTION symbol against a
5783 processor specific section. If we have
5784 discarded a section, the output_section will
5785 be the absolute section. */
5787 && (bfd_is_abs_section (sec
)
5788 || (sec
->output_section
!= NULL
5789 && bfd_is_abs_section (sec
->output_section
))))
5791 else if (sec
== NULL
|| sec
->owner
== NULL
)
5793 bfd_set_error (bfd_error_bad_value
);
5798 r_symndx
= sec
->output_section
->target_index
;
5799 BFD_ASSERT (r_symndx
!= 0);
5804 if (finfo
->indices
[r_symndx
] == -1)
5810 if (finfo
->info
->strip
== strip_all
)
5812 /* You can't do ld -r -s. */
5813 bfd_set_error (bfd_error_invalid_operation
);
5817 /* This symbol was skipped earlier, but
5818 since it is needed by a reloc, we
5819 must output it now. */
5820 link
= symtab_hdr
->sh_link
;
5821 name
= bfd_elf_string_from_elf_section (input_bfd
,
5827 osec
= sec
->output_section
;
5829 _bfd_elf_section_from_bfd_section (output_bfd
,
5831 if (isym
->st_shndx
== (unsigned short) -1)
5834 isym
->st_value
+= sec
->output_offset
;
5835 if (! finfo
->info
->relocateable
)
5836 isym
->st_value
+= osec
->vma
;
5838 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5840 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5844 r_symndx
= finfo
->indices
[r_symndx
];
5847 irela
->r_info
= ELF_R_INFO (r_symndx
,
5848 ELF_R_TYPE (irela
->r_info
));
5851 /* Swap out the relocs. */
5852 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5853 elf_link_output_relocs (output_bfd
, o
,
5857 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5858 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5860 elf_link_output_relocs (output_bfd
, o
,
5866 /* Write out the modified section contents. */
5867 if (elf_section_data (o
)->stab_info
== NULL
)
5869 if (! (o
->flags
& SEC_EXCLUDE
) &&
5870 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5871 contents
, o
->output_offset
,
5872 (o
->_cooked_size
!= 0
5879 if (! (_bfd_write_section_stabs
5880 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5881 o
, &elf_section_data (o
)->stab_info
, contents
)))
5889 /* Generate a reloc when linking an ELF file. This is a reloc
5890 requested by the linker, and does come from any input file. This
5891 is used to build constructor and destructor tables when linking
5895 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5897 struct bfd_link_info
*info
;
5898 asection
*output_section
;
5899 struct bfd_link_order
*link_order
;
5901 reloc_howto_type
*howto
;
5905 struct elf_link_hash_entry
**rel_hash_ptr
;
5906 Elf_Internal_Shdr
*rel_hdr
;
5907 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
5909 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5912 bfd_set_error (bfd_error_bad_value
);
5916 addend
= link_order
->u
.reloc
.p
->addend
;
5918 /* Figure out the symbol index. */
5919 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5920 + elf_section_data (output_section
)->rel_count
5921 + elf_section_data (output_section
)->rel_count2
);
5922 if (link_order
->type
== bfd_section_reloc_link_order
)
5924 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5925 BFD_ASSERT (indx
!= 0);
5926 *rel_hash_ptr
= NULL
;
5930 struct elf_link_hash_entry
*h
;
5932 /* Treat a reloc against a defined symbol as though it were
5933 actually against the section. */
5934 h
= ((struct elf_link_hash_entry
*)
5935 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5936 link_order
->u
.reloc
.p
->u
.name
,
5937 false, false, true));
5939 && (h
->root
.type
== bfd_link_hash_defined
5940 || h
->root
.type
== bfd_link_hash_defweak
))
5944 section
= h
->root
.u
.def
.section
;
5945 indx
= section
->output_section
->target_index
;
5946 *rel_hash_ptr
= NULL
;
5947 /* It seems that we ought to add the symbol value to the
5948 addend here, but in practice it has already been added
5949 because it was passed to constructor_callback. */
5950 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5954 /* Setting the index to -2 tells elf_link_output_extsym that
5955 this symbol is used by a reloc. */
5962 if (! ((*info
->callbacks
->unattached_reloc
)
5963 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5964 (asection
*) NULL
, (bfd_vma
) 0)))
5970 /* If this is an inplace reloc, we must write the addend into the
5972 if (howto
->partial_inplace
&& addend
!= 0)
5975 bfd_reloc_status_type rstat
;
5979 size
= bfd_get_reloc_size (howto
);
5980 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5981 if (buf
== (bfd_byte
*) NULL
)
5983 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5989 case bfd_reloc_outofrange
:
5991 case bfd_reloc_overflow
:
5992 if (! ((*info
->callbacks
->reloc_overflow
)
5994 (link_order
->type
== bfd_section_reloc_link_order
5995 ? bfd_section_name (output_bfd
,
5996 link_order
->u
.reloc
.p
->u
.section
)
5997 : link_order
->u
.reloc
.p
->u
.name
),
5998 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
6006 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
6007 (file_ptr
) link_order
->offset
, size
);
6013 /* The address of a reloc is relative to the section in a
6014 relocateable file, and is a virtual address in an executable
6016 offset
= link_order
->offset
;
6017 if (! info
->relocateable
)
6018 offset
+= output_section
->vma
;
6020 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
6022 if (rel_hdr
->sh_type
== SHT_REL
)
6024 Elf_Internal_Rel irel
;
6025 Elf_External_Rel
*erel
;
6027 irel
.r_offset
= offset
;
6028 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
6029 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
6030 + elf_section_data (output_section
)->rel_count
);
6031 if (bed
->s
->swap_reloc_out
)
6032 (*bed
->s
->swap_reloc_out
) (output_bfd
, &irel
, (bfd_byte
*) erel
);
6034 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
6038 Elf_Internal_Rela irela
;
6039 Elf_External_Rela
*erela
;
6041 irela
.r_offset
= offset
;
6042 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
6043 irela
.r_addend
= addend
;
6044 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
6045 + elf_section_data (output_section
)->rel_count
);
6046 if (bed
->s
->swap_reloca_out
)
6047 (*bed
->s
->swap_reloca_out
) (output_bfd
, &irela
, (bfd_byte
*) erela
);
6049 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
6052 ++elf_section_data (output_section
)->rel_count
;
6058 /* Allocate a pointer to live in a linker created section. */
6061 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
6063 struct bfd_link_info
*info
;
6064 elf_linker_section_t
*lsect
;
6065 struct elf_link_hash_entry
*h
;
6066 const Elf_Internal_Rela
*rel
;
6068 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
6069 elf_linker_section_pointers_t
*linker_section_ptr
;
6070 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
6072 BFD_ASSERT (lsect
!= NULL
);
6074 /* Is this a global symbol? */
6077 /* Has this symbol already been allocated, if so, our work is done */
6078 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
6083 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
6084 /* Make sure this symbol is output as a dynamic symbol. */
6085 if (h
->dynindx
== -1)
6087 if (! elf_link_record_dynamic_symbol (info
, h
))
6091 if (lsect
->rel_section
)
6092 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
6095 else /* Allocation of a pointer to a local symbol */
6097 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
6099 /* Allocate a table to hold the local symbols if first time */
6102 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6103 register unsigned int i
;
6105 ptr
= (elf_linker_section_pointers_t
**)
6106 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
6111 elf_local_ptr_offsets (abfd
) = ptr
;
6112 for (i
= 0; i
< num_symbols
; i
++)
6113 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
6116 /* Has this symbol already been allocated, if so, our work is done */
6117 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
6122 ptr_linker_section_ptr
= &ptr
[r_symndx
];
6126 /* If we are generating a shared object, we need to
6127 output a R_<xxx>_RELATIVE reloc so that the
6128 dynamic linker can adjust this GOT entry. */
6129 BFD_ASSERT (lsect
->rel_section
!= NULL
);
6130 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
6134 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
6135 from internal memory. */
6136 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
6137 linker_section_ptr
= (elf_linker_section_pointers_t
*)
6138 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
6140 if (!linker_section_ptr
)
6143 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
6144 linker_section_ptr
->addend
= rel
->r_addend
;
6145 linker_section_ptr
->which
= lsect
->which
;
6146 linker_section_ptr
->written_address_p
= false;
6147 *ptr_linker_section_ptr
= linker_section_ptr
;
6150 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
6152 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
6153 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
6154 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
6155 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
6157 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
6159 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
6160 lsect
->sym_hash
->root
.root
.string
,
6161 (long)ARCH_SIZE
/ 8,
6162 (long)lsect
->sym_hash
->root
.u
.def
.value
);
6168 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
6170 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
6173 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
6174 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
6182 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
6185 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
6188 /* Fill in the address for a pointer generated in alinker section. */
6191 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
6194 struct bfd_link_info
*info
;
6195 elf_linker_section_t
*lsect
;
6196 struct elf_link_hash_entry
*h
;
6198 const Elf_Internal_Rela
*rel
;
6201 elf_linker_section_pointers_t
*linker_section_ptr
;
6203 BFD_ASSERT (lsect
!= NULL
);
6205 if (h
!= NULL
) /* global symbol */
6207 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
6211 BFD_ASSERT (linker_section_ptr
!= NULL
);
6213 if (! elf_hash_table (info
)->dynamic_sections_created
6216 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
6218 /* This is actually a static link, or it is a
6219 -Bsymbolic link and the symbol is defined
6220 locally. We must initialize this entry in the
6223 When doing a dynamic link, we create a .rela.<xxx>
6224 relocation entry to initialize the value. This
6225 is done in the finish_dynamic_symbol routine. */
6226 if (!linker_section_ptr
->written_address_p
)
6228 linker_section_ptr
->written_address_p
= true;
6229 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6230 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6234 else /* local symbol */
6236 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6237 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
6238 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
6239 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
6243 BFD_ASSERT (linker_section_ptr
!= NULL
);
6245 /* Write out pointer if it hasn't been rewritten out before */
6246 if (!linker_section_ptr
->written_address_p
)
6248 linker_section_ptr
->written_address_p
= true;
6249 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6250 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6254 asection
*srel
= lsect
->rel_section
;
6255 Elf_Internal_Rela outrel
;
6257 /* We need to generate a relative reloc for the dynamic linker. */
6259 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
6262 BFD_ASSERT (srel
!= NULL
);
6264 outrel
.r_offset
= (lsect
->section
->output_section
->vma
6265 + lsect
->section
->output_offset
6266 + linker_section_ptr
->offset
);
6267 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
6268 outrel
.r_addend
= 0;
6269 elf_swap_reloca_out (output_bfd
, &outrel
,
6270 (((Elf_External_Rela
*)
6271 lsect
->section
->contents
)
6272 + elf_section_data (lsect
->section
)->rel_count
));
6273 ++elf_section_data (lsect
->section
)->rel_count
;
6278 relocation
= (lsect
->section
->output_offset
6279 + linker_section_ptr
->offset
6280 - lsect
->hole_offset
6281 - lsect
->sym_offset
);
6284 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6285 lsect
->name
, (long)relocation
, (long)relocation
);
6288 /* Subtract out the addend, because it will get added back in by the normal
6290 return relocation
- linker_section_ptr
->addend
;
6293 /* Garbage collect unused sections. */
6295 static boolean elf_gc_mark
6296 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
6297 asection
* (*gc_mark_hook
)
6298 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6299 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
6301 static boolean elf_gc_sweep
6302 PARAMS ((struct bfd_link_info
*info
,
6303 boolean (*gc_sweep_hook
)
6304 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6305 const Elf_Internal_Rela
*relocs
))));
6307 static boolean elf_gc_sweep_symbol
6308 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
6310 static boolean elf_gc_allocate_got_offsets
6311 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
6313 static boolean elf_gc_propagate_vtable_entries_used
6314 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6316 static boolean elf_gc_smash_unused_vtentry_relocs
6317 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6319 /* The mark phase of garbage collection. For a given section, mark
6320 it, and all the sections which define symbols to which it refers. */
6323 elf_gc_mark (info
, sec
, gc_mark_hook
)
6324 struct bfd_link_info
*info
;
6326 asection
* (*gc_mark_hook
)
6327 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6328 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
6334 /* Look through the section relocs. */
6336 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
6338 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
6339 Elf_Internal_Shdr
*symtab_hdr
;
6340 struct elf_link_hash_entry
**sym_hashes
;
6343 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
6344 bfd
*input_bfd
= sec
->owner
;
6345 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
6347 /* GCFIXME: how to arrange so that relocs and symbols are not
6348 reread continually? */
6350 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6351 sym_hashes
= elf_sym_hashes (input_bfd
);
6353 /* Read the local symbols. */
6354 if (elf_bad_symtab (input_bfd
))
6356 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6360 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
6361 if (symtab_hdr
->contents
)
6362 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6363 else if (nlocsyms
== 0)
6367 locsyms
= freesyms
=
6368 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
6369 if (freesyms
== NULL
6370 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6371 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
6372 nlocsyms
, input_bfd
)
6373 != nlocsyms
* sizeof (Elf_External_Sym
)))
6380 /* Read the relocations. */
6381 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6382 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
6383 info
->keep_memory
));
6384 if (relstart
== NULL
)
6389 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6391 for (rel
= relstart
; rel
< relend
; rel
++)
6393 unsigned long r_symndx
;
6395 struct elf_link_hash_entry
*h
;
6398 r_symndx
= ELF_R_SYM (rel
->r_info
);
6402 if (elf_bad_symtab (sec
->owner
))
6404 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6405 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
6406 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6409 h
= sym_hashes
[r_symndx
- extsymoff
];
6410 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6413 else if (r_symndx
>= nlocsyms
)
6415 h
= sym_hashes
[r_symndx
- extsymoff
];
6416 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6420 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6421 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6424 if (rsec
&& !rsec
->gc_mark
)
6425 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
6433 if (!info
->keep_memory
)
6443 /* The sweep phase of garbage collection. Remove all garbage sections. */
6446 elf_gc_sweep (info
, gc_sweep_hook
)
6447 struct bfd_link_info
*info
;
6448 boolean (*gc_sweep_hook
)
6449 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6450 const Elf_Internal_Rela
*relocs
));
6454 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6458 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6461 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6463 /* Keep special sections. Keep .debug sections. */
6464 if ((o
->flags
& SEC_LINKER_CREATED
)
6465 || (o
->flags
& SEC_DEBUGGING
))
6471 /* Skip sweeping sections already excluded. */
6472 if (o
->flags
& SEC_EXCLUDE
)
6475 /* Since this is early in the link process, it is simple
6476 to remove a section from the output. */
6477 o
->flags
|= SEC_EXCLUDE
;
6479 /* But we also have to update some of the relocation
6480 info we collected before. */
6482 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
6484 Elf_Internal_Rela
*internal_relocs
;
6487 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6488 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6489 if (internal_relocs
== NULL
)
6492 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6494 if (!info
->keep_memory
)
6495 free (internal_relocs
);
6503 /* Remove the symbols that were in the swept sections from the dynamic
6504 symbol table. GCFIXME: Anyone know how to get them out of the
6505 static symbol table as well? */
6509 elf_link_hash_traverse (elf_hash_table (info
),
6510 elf_gc_sweep_symbol
,
6513 elf_hash_table (info
)->dynsymcount
= i
;
6519 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6522 elf_gc_sweep_symbol (h
, idxptr
)
6523 struct elf_link_hash_entry
*h
;
6526 int *idx
= (int *) idxptr
;
6528 if (h
->dynindx
!= -1
6529 && ((h
->root
.type
!= bfd_link_hash_defined
6530 && h
->root
.type
!= bfd_link_hash_defweak
)
6531 || h
->root
.u
.def
.section
->gc_mark
))
6532 h
->dynindx
= (*idx
)++;
6537 /* Propogate collected vtable information. This is called through
6538 elf_link_hash_traverse. */
6541 elf_gc_propagate_vtable_entries_used (h
, okp
)
6542 struct elf_link_hash_entry
*h
;
6545 /* Those that are not vtables. */
6546 if (h
->vtable_parent
== NULL
)
6549 /* Those vtables that do not have parents, we cannot merge. */
6550 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6553 /* If we've already been done, exit. */
6554 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6557 /* Make sure the parent's table is up to date. */
6558 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6560 if (h
->vtable_entries_used
== NULL
)
6562 /* None of this table's entries were referenced. Re-use the
6564 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6565 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6572 /* Or the parent's entries into ours. */
6573 cu
= h
->vtable_entries_used
;
6575 pu
= h
->vtable_parent
->vtable_entries_used
;
6578 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6581 if (*pu
) *cu
= true;
6591 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6592 struct elf_link_hash_entry
*h
;
6596 bfd_vma hstart
, hend
;
6597 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6598 struct elf_backend_data
*bed
;
6600 /* Take care of both those symbols that do not describe vtables as
6601 well as those that are not loaded. */
6602 if (h
->vtable_parent
== NULL
)
6605 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6606 || h
->root
.type
== bfd_link_hash_defweak
);
6608 sec
= h
->root
.u
.def
.section
;
6609 hstart
= h
->root
.u
.def
.value
;
6610 hend
= hstart
+ h
->size
;
6612 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6613 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6615 return *(boolean
*)okp
= false;
6616 bed
= get_elf_backend_data (sec
->owner
);
6617 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6619 for (rel
= relstart
; rel
< relend
; ++rel
)
6620 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6622 /* If the entry is in use, do nothing. */
6623 if (h
->vtable_entries_used
6624 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6626 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6627 if (h
->vtable_entries_used
[entry
])
6630 /* Otherwise, kill it. */
6631 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6637 /* Do mark and sweep of unused sections. */
6640 elf_gc_sections (abfd
, info
)
6642 struct bfd_link_info
*info
;
6646 asection
* (*gc_mark_hook
)
6647 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6648 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6650 if (!get_elf_backend_data (abfd
)->can_gc_sections
6651 || info
->relocateable
|| info
->emitrelocations
6652 || elf_hash_table (info
)->dynamic_sections_created
)
6655 /* Apply transitive closure to the vtable entry usage info. */
6656 elf_link_hash_traverse (elf_hash_table (info
),
6657 elf_gc_propagate_vtable_entries_used
,
6662 /* Kill the vtable relocations that were not used. */
6663 elf_link_hash_traverse (elf_hash_table (info
),
6664 elf_gc_smash_unused_vtentry_relocs
,
6669 /* Grovel through relocs to find out who stays ... */
6671 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6672 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6676 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6679 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6681 if (o
->flags
& SEC_KEEP
)
6682 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6687 /* ... and mark SEC_EXCLUDE for those that go. */
6688 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6694 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6697 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6700 struct elf_link_hash_entry
*h
;
6703 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6704 struct elf_link_hash_entry
**search
, *child
;
6705 bfd_size_type extsymcount
;
6707 /* The sh_info field of the symtab header tells us where the
6708 external symbols start. We don't care about the local symbols at
6710 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6711 if (!elf_bad_symtab (abfd
))
6712 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6714 sym_hashes
= elf_sym_hashes (abfd
);
6715 sym_hashes_end
= sym_hashes
+ extsymcount
;
6717 /* Hunt down the child symbol, which is in this section at the same
6718 offset as the relocation. */
6719 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6721 if ((child
= *search
) != NULL
6722 && (child
->root
.type
== bfd_link_hash_defined
6723 || child
->root
.type
== bfd_link_hash_defweak
)
6724 && child
->root
.u
.def
.section
== sec
6725 && child
->root
.u
.def
.value
== offset
)
6729 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6730 bfd_get_filename (abfd
), sec
->name
,
6731 (unsigned long)offset
);
6732 bfd_set_error (bfd_error_invalid_operation
);
6738 /* This *should* only be the absolute section. It could potentially
6739 be that someone has defined a non-global vtable though, which
6740 would be bad. It isn't worth paging in the local symbols to be
6741 sure though; that case should simply be handled by the assembler. */
6743 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6746 child
->vtable_parent
= h
;
6751 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6754 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6755 bfd
*abfd ATTRIBUTE_UNUSED
;
6756 asection
*sec ATTRIBUTE_UNUSED
;
6757 struct elf_link_hash_entry
*h
;
6760 if (addend
>= h
->vtable_entries_size
)
6763 boolean
*ptr
= h
->vtable_entries_used
;
6765 /* While the symbol is undefined, we have to be prepared to handle
6767 if (h
->root
.type
== bfd_link_hash_undefined
)
6774 /* Oops! We've got a reference past the defined end of
6775 the table. This is probably a bug -- shall we warn? */
6780 /* Allocate one extra entry for use as a "done" flag for the
6781 consolidation pass. */
6782 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof (boolean
);
6786 ptr
= bfd_realloc (ptr
- 1, bytes
);
6792 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof (boolean
);
6793 memset (((char *)ptr
) + oldbytes
, 0, bytes
- oldbytes
);
6797 ptr
= bfd_zmalloc (bytes
);
6802 /* And arrange for that done flag to be at index -1. */
6803 h
->vtable_entries_used
= ptr
+ 1;
6804 h
->vtable_entries_size
= size
;
6807 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6812 /* And an accompanying bit to work out final got entry offsets once
6813 we're done. Should be called from final_link. */
6816 elf_gc_common_finalize_got_offsets (abfd
, info
)
6818 struct bfd_link_info
*info
;
6821 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6824 /* The GOT offset is relative to the .got section, but the GOT header is
6825 put into the .got.plt section, if the backend uses it. */
6826 if (bed
->want_got_plt
)
6829 gotoff
= bed
->got_header_size
;
6831 /* Do the local .got entries first. */
6832 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6834 bfd_signed_vma
*local_got
;
6835 bfd_size_type j
, locsymcount
;
6836 Elf_Internal_Shdr
*symtab_hdr
;
6838 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
6841 local_got
= elf_local_got_refcounts (i
);
6845 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6846 if (elf_bad_symtab (i
))
6847 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6849 locsymcount
= symtab_hdr
->sh_info
;
6851 for (j
= 0; j
< locsymcount
; ++j
)
6853 if (local_got
[j
] > 0)
6855 local_got
[j
] = gotoff
;
6856 gotoff
+= ARCH_SIZE
/ 8;
6859 local_got
[j
] = (bfd_vma
) -1;
6863 /* Then the global .got entries. .plt refcounts are handled by
6864 adjust_dynamic_symbol */
6865 elf_link_hash_traverse (elf_hash_table (info
),
6866 elf_gc_allocate_got_offsets
,
6871 /* We need a special top-level link routine to convert got reference counts
6872 to real got offsets. */
6875 elf_gc_allocate_got_offsets (h
, offarg
)
6876 struct elf_link_hash_entry
*h
;
6879 bfd_vma
*off
= (bfd_vma
*) offarg
;
6881 if (h
->got
.refcount
> 0)
6883 h
->got
.offset
= off
[0];
6884 off
[0] += ARCH_SIZE
/ 8;
6887 h
->got
.offset
= (bfd_vma
) -1;
6892 /* Many folk need no more in the way of final link than this, once
6893 got entry reference counting is enabled. */
6896 elf_gc_common_final_link (abfd
, info
)
6898 struct bfd_link_info
*info
;
6900 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6903 /* Invoke the regular ELF backend linker to do all the work. */
6904 return elf_bfd_final_link (abfd
, info
);
6907 /* This function will be called though elf_link_hash_traverse to store
6908 all hash value of the exported symbols in an array. */
6911 elf_collect_hash_codes (h
, data
)
6912 struct elf_link_hash_entry
*h
;
6915 unsigned long **valuep
= (unsigned long **) data
;
6921 /* Ignore indirect symbols. These are added by the versioning code. */
6922 if (h
->dynindx
== -1)
6925 name
= h
->root
.root
.string
;
6926 p
= strchr (name
, ELF_VER_CHR
);
6929 alc
= bfd_malloc (p
- name
+ 1);
6930 memcpy (alc
, name
, p
- name
);
6931 alc
[p
- name
] = '\0';
6935 /* Compute the hash value. */
6936 ha
= bfd_elf_hash (name
);
6938 /* Store the found hash value in the array given as the argument. */
6941 /* And store it in the struct so that we can put it in the hash table
6943 h
->elf_hash_value
= ha
;