1 /* ELF emulation code for targets using elf.em.
2 Copyright (C) 1991-2020 Free Software Foundation, Inc.
4 This file is part of the GNU Binutils.
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
23 #include "libiberty.h"
24 #include "filenames.h"
25 #include "safe-ctype.h"
35 #include "ldbuildid.h"
49 /* Style of .note.gnu.build-id section. */
50 const char *ldelf_emit_note_gnu_build_id
;
52 /* These variables are required to pass information back and forth
53 between after_open and check_needed and stat_needed and vercheck. */
55 static struct bfd_link_needed_list
*global_needed
;
56 static lang_input_statement_type
*global_found
;
57 static struct stat global_stat
;
58 static struct bfd_link_needed_list
*global_vercheck_needed
;
59 static bfd_boolean global_vercheck_failed
;
62 ldelf_after_parse (void)
64 if (bfd_link_pie (&link_info
))
65 link_info
.flags_1
|= (bfd_vma
) DF_1_PIE
;
67 if (bfd_link_executable (&link_info
)
68 && link_info
.nointerp
)
70 if (link_info
.dynamic_undefined_weak
> 0)
71 einfo (_("%P: warning: -z dynamic-undefined-weak ignored\n"));
72 link_info
.dynamic_undefined_weak
= 0;
74 after_parse_default ();
77 /* Handle the generation of DT_NEEDED tags. */
80 ldelf_load_symbols (lang_input_statement_type
*entry
)
84 /* Tell the ELF linker that we don't want the output file to have a
85 DT_NEEDED entry for this file, unless it is used to resolve
86 references in a regular object. */
87 if (entry
->flags
.add_DT_NEEDED_for_regular
)
88 link_class
= DYN_AS_NEEDED
;
90 /* Tell the ELF linker that we don't want the output file to have a
91 DT_NEEDED entry for any dynamic library in DT_NEEDED tags from
93 if (!entry
->flags
.add_DT_NEEDED_for_dynamic
)
94 link_class
|= DYN_NO_ADD_NEEDED
;
96 if (entry
->flags
.just_syms
97 && (bfd_get_file_flags (entry
->the_bfd
) & DYNAMIC
) != 0)
98 einfo (_("%F%P: %pB: --just-symbols may not be used on DSO\n"),
102 || (bfd_get_file_flags (entry
->the_bfd
) & DYNAMIC
) == 0)
105 bfd_elf_set_dyn_lib_class (entry
->the_bfd
,
106 (enum dynamic_lib_link_class
) link_class
);
108 /* Continue on with normal load_symbols processing. */
112 /* On Linux, it's possible to have different versions of the same
113 shared library linked against different versions of libc. The
114 dynamic linker somehow tags which libc version to use in
115 /etc/ld.so.cache, and, based on the libc that it sees in the
116 executable, chooses which version of the shared library to use.
118 We try to do a similar check here by checking whether this shared
119 library needs any other shared libraries which may conflict with
120 libraries we have already included in the link. If it does, we
121 skip it, and try to find another shared library farther on down the
124 This is called via lang_for_each_input_file.
125 GLOBAL_VERCHECK_NEEDED is the list of objects needed by the object
126 which we are checking. This sets GLOBAL_VERCHECK_FAILED if we find
127 a conflicting version. */
130 ldelf_vercheck (lang_input_statement_type
*s
)
133 struct bfd_link_needed_list
*l
;
135 if (global_vercheck_failed
)
137 if (s
->the_bfd
== NULL
138 || (bfd_get_file_flags (s
->the_bfd
) & DYNAMIC
) == 0)
141 soname
= bfd_elf_get_dt_soname (s
->the_bfd
);
143 soname
= lbasename (bfd_get_filename (s
->the_bfd
));
145 for (l
= global_vercheck_needed
; l
!= NULL
; l
= l
->next
)
149 if (filename_cmp (soname
, l
->name
) == 0)
151 /* Probably can't happen, but it's an easy check. */
155 if (strchr (l
->name
, '/') != NULL
)
158 suffix
= strstr (l
->name
, ".so.");
162 suffix
+= sizeof ".so." - 1;
164 if (filename_ncmp (soname
, l
->name
, suffix
- l
->name
) == 0)
166 /* Here we know that S is a dynamic object FOO.SO.VER1, and
167 the object we are considering needs a dynamic object
168 FOO.SO.VER2, and VER1 and VER2 are different. This
169 appears to be a version mismatch, so we tell the caller
170 to try a different version of this library. */
171 global_vercheck_failed
= TRUE
;
178 /* See if an input file matches a DT_NEEDED entry by running stat on
182 ldelf_stat_needed (lang_input_statement_type
*s
)
188 if (global_found
!= NULL
)
190 if (s
->the_bfd
== NULL
)
193 /* If this input file was an as-needed entry, and wasn't found to be
194 needed at the stage it was linked, then don't say we have loaded it. */
195 if ((bfd_elf_get_dyn_lib_class (s
->the_bfd
) & DYN_AS_NEEDED
) != 0)
198 if (bfd_stat (s
->the_bfd
, &st
) != 0)
200 einfo (_("%P: %pB: bfd_stat failed: %E\n"), s
->the_bfd
);
204 /* Some operating systems, e.g. Windows, do not provide a meaningful
205 st_ino; they always set it to zero. (Windows does provide a
206 meaningful st_dev.) Do not indicate a duplicate library in that
207 case. While there is no guarantee that a system that provides
208 meaningful inode numbers will never set st_ino to zero, this is
209 merely an optimization, so we do not need to worry about false
211 if (st
.st_dev
== global_stat
.st_dev
212 && st
.st_ino
== global_stat
.st_ino
219 /* We issue a warning if it looks like we are including two
220 different versions of the same shared library. For example,
221 there may be a problem if -lc picks up libc.so.6 but some other
222 shared library has a DT_NEEDED entry of libc.so.5. This is a
223 heuristic test, and it will only work if the name looks like
224 NAME.so.VERSION. FIXME: Depending on file names is error-prone.
225 If we really want to issue warnings about mixing version numbers
226 of shared libraries, we need to find a better way. */
228 if (strchr (global_needed
->name
, '/') != NULL
)
230 suffix
= strstr (global_needed
->name
, ".so.");
233 suffix
+= sizeof ".so." - 1;
235 soname
= bfd_elf_get_dt_soname (s
->the_bfd
);
237 soname
= lbasename (s
->filename
);
239 if (filename_ncmp (soname
, global_needed
->name
,
240 suffix
- global_needed
->name
) == 0)
241 einfo (_("%P: warning: %s, needed by %pB, may conflict with %s\n"),
242 global_needed
->name
, global_needed
->by
, soname
);
245 /* This function is called for each possible name for a dynamic object
246 named by a DT_NEEDED entry. The FORCE parameter indicates whether
247 to skip the check for a conflicting version. */
250 ldelf_try_needed (struct dt_needed
*needed
, int force
, int is_linux
)
253 const char *name
= needed
->name
;
257 abfd
= bfd_openr (name
, bfd_get_target (link_info
.output_bfd
));
261 info_msg (_("attempt to open %s failed\n"), name
);
265 /* Linker needs to decompress sections. */
266 abfd
->flags
|= BFD_DECOMPRESS
;
268 if (! bfd_check_format (abfd
, bfd_object
))
273 if ((bfd_get_file_flags (abfd
) & DYNAMIC
) == 0)
279 /* For DT_NEEDED, they have to match. */
280 if (abfd
->xvec
!= link_info
.output_bfd
->xvec
)
286 /* Check whether this object would include any conflicting library
287 versions. If FORCE is set, then we skip this check; we use this
288 the second time around, if we couldn't find any compatible
289 instance of the shared library. */
293 struct bfd_link_needed_list
*needs
;
295 if (! bfd_elf_get_bfd_needed_list (abfd
, &needs
))
296 einfo (_("%F%P: %pB: bfd_elf_get_bfd_needed_list failed: %E\n"), abfd
);
300 global_vercheck_needed
= needs
;
301 global_vercheck_failed
= FALSE
;
302 lang_for_each_input_file (ldelf_vercheck
);
303 if (global_vercheck_failed
)
306 /* Return FALSE to force the caller to move on to try
307 another file on the search path. */
311 /* But wait! It gets much worse. On Linux, if a shared
312 library does not use libc at all, we are supposed to skip
313 it the first time around in case we encounter a shared
314 library later on with the same name which does use the
315 version of libc that we want. This is much too horrible
316 to use on any system other than Linux. */
319 struct bfd_link_needed_list
*l
;
321 for (l
= needs
; l
!= NULL
; l
= l
->next
)
322 if (CONST_STRNEQ (l
->name
, "libc.so"))
333 /* We've found a dynamic object matching the DT_NEEDED entry. */
335 /* We have already checked that there is no other input file of the
336 same name. We must now check again that we are not including the
337 same file twice. We need to do this because on many systems
338 libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will
339 reference libc.so.1. If we have already included libc.so, we
340 don't want to include libc.so.1 if they are the same file, and we
341 can only check that using stat. */
343 if (bfd_stat (abfd
, &global_stat
) != 0)
344 einfo (_("%F%P: %pB: bfd_stat failed: %E\n"), abfd
);
346 /* First strip off everything before the last '/'. */
347 soname
= lbasename (bfd_get_filename (abfd
));
350 info_msg (_("found %s at %s\n"), soname
, name
);
353 lang_for_each_input_file (ldelf_stat_needed
);
354 if (global_found
!= NULL
)
356 /* Return TRUE to indicate that we found the file, even though
357 we aren't going to do anything with it. */
361 /* Specify the soname to use. */
362 bfd_elf_set_dt_needed_name (abfd
, soname
);
364 /* Tell the ELF linker that we don't want the output file to have a
365 DT_NEEDED entry for this file, unless it is used to resolve
366 references in a regular object. */
367 link_class
= DYN_DT_NEEDED
;
369 /* Tell the ELF linker that we don't want the output file to have a
370 DT_NEEDED entry for this file at all if the entry is from a file
371 with DYN_NO_ADD_NEEDED. */
372 if (needed
->by
!= NULL
373 && (bfd_elf_get_dyn_lib_class (needed
->by
) & DYN_NO_ADD_NEEDED
) != 0)
374 link_class
|= DYN_NO_NEEDED
| DYN_NO_ADD_NEEDED
;
376 bfd_elf_set_dyn_lib_class (abfd
, (enum dynamic_lib_link_class
) link_class
);
378 *link_info
.input_bfds_tail
= abfd
;
379 link_info
.input_bfds_tail
= &abfd
->link
.next
;
381 /* Add this file into the symbol table. */
382 if (! bfd_link_add_symbols (abfd
, &link_info
))
383 einfo (_("%F%P: %pB: error adding symbols: %E\n"), abfd
);
388 /* Search for a needed file in a path. */
391 ldelf_search_needed (const char *path
, struct dt_needed
*n
, int force
,
392 int is_linux
, int elfsize
)
395 const char *name
= n
->name
;
397 struct dt_needed needed
;
400 return ldelf_try_needed (n
, force
, is_linux
);
402 if (path
== NULL
|| *path
== '\0')
406 needed
.name
= n
->name
;
413 char *filename
, *sset
;
415 s
= strchr (path
, config
.rpath_separator
);
417 s
= path
+ strlen (path
);
419 #if HAVE_DOS_BASED_FILE_SYSTEM
420 /* Assume a match on the second char is part of drive specifier. */
421 else if (config
.rpath_separator
== ':'
425 s
= strchr (s
+ 1, config
.rpath_separator
);
427 s
= path
+ strlen (path
);
430 filename
= (char *) xmalloc (s
- path
+ len
+ 2);
435 memcpy (filename
, path
, s
- path
);
436 filename
[s
- path
] = '/';
437 sset
= filename
+ (s
- path
) + 1;
441 /* PR 20535: Support the same pseudo-environment variables that
442 are supported by ld.so. Namely, $ORIGIN, $LIB and $PLATFORM.
443 Since there can be more than one occurrence of these tokens in
444 the path we loop until no more are found. Since we might not
445 be able to substitute some of the tokens we maintain an offset
446 into the filename for where we should begin our scan. */
447 while ((var
= strchr (filename
+ offset
, '$')) != NULL
)
449 /* The ld.so manual page does not say, but I am going to assume that
450 these tokens are terminated by a directory separator character
451 (/) or the end of the string. There is also an implication that
452 $ORIGIN should only be used at the start of a path, but that is
455 The ld.so manual page also states that it allows ${ORIGIN},
456 ${LIB} and ${PLATFORM}, so these are supported as well.
458 FIXME: The code could be a lot cleverer about allocating space
459 for the processed string. */
460 char * end
= strchr (var
, '/');
461 const char *replacement
= NULL
;
463 char * freeme
= NULL
;
464 unsigned flen
= strlen (filename
);
467 /* Temporarily terminate the filename at the end of the token. */
475 if (strcmp (v
, "RIGIN") == 0 || strcmp (v
, "RIGIN}") == 0)
477 /* ORIGIN - replace with the full path to the directory
478 containing the program or shared object. */
479 if (needed
.by
== NULL
)
481 if (link_info
.output_bfd
== NULL
)
486 replacement
= bfd_get_filename (link_info
.output_bfd
);
489 replacement
= bfd_get_filename (needed
.by
);
495 if (replacement
[0] == '/')
496 freeme
= xstrdup (replacement
);
499 char * current_dir
= getpwd ();
501 freeme
= xmalloc (strlen (replacement
)
502 + strlen (current_dir
) + 2);
503 sprintf (freeme
, "%s/%s", current_dir
, replacement
);
506 replacement
= freeme
;
507 if ((slash
= strrchr (replacement
, '/')) != NULL
)
514 if (strcmp (v
, "IB") == 0 || strcmp (v
, "IB}") == 0)
516 /* LIB - replace with "lib" in 32-bit environments
517 and "lib64" in 64-bit environments. */
521 case 32: replacement
= "lib"; break;
522 case 64: replacement
= "lib64"; break;
530 /* Supporting $PLATFORM in a cross-hosted environment is not
531 possible. Supporting it in a native environment involves
532 loading the <sys/auxv.h> header file which loads the
533 system <elf.h> header file, which conflicts with the
534 "include/elf/mips.h" header file. */
542 char * filename2
= xmalloc (flen
+ strlen (replacement
));
546 sprintf (filename2
, "%.*s%s/%s",
547 (int)(var
- filename
), filename
,
548 replacement
, end
+ 1);
549 offset
= (var
- filename
) + 1 + strlen (replacement
);
553 sprintf (filename2
, "%.*s%s",
554 (int)(var
- filename
), filename
,
556 offset
= var
- filename
+ strlen (replacement
);
560 filename
= filename2
;
561 /* There is no need to restore the path separator (when
562 end != NULL) as we have replaced the entire string. */
567 /* We only issue an "unrecognised" message in verbose mode
568 as the $<foo> token might be a legitimate component of
569 a path name in the target's file system. */
570 info_msg (_("unrecognised or unsupported token "
571 "'%s' in search path\n"), var
);
573 /* Restore the path separator. */
576 /* PR 20784: Make sure that we resume the scan *after*
577 the token that we could not replace. */
578 offset
= (var
+ 1) - filename
;
584 needed
.name
= filename
;
586 if (ldelf_try_needed (&needed
, force
, is_linux
))
599 /* Prefix the sysroot to absolute paths in PATH, a string containing
600 paths separated by config.rpath_separator. If running on a DOS
601 file system, paths containing a drive spec won't have the sysroot
602 prefix added, unless the sysroot also specifies the same drive. */
605 ldelf_add_sysroot (const char *path
)
610 int dos_drive_sysroot
= HAS_DRIVE_SPEC (ld_sysroot
);
612 len
= strlen (ld_sysroot
);
613 for (extra
= 0, p
= path
; ; )
615 int dos_drive
= HAS_DRIVE_SPEC (p
);
619 if (IS_DIR_SEPARATOR (*p
)
621 || (dos_drive_sysroot
622 && ld_sysroot
[0] == p
[-2])))
624 if (dos_drive
&& dos_drive_sysroot
)
629 p
= strchr (p
, config
.rpath_separator
);
635 ret
= xmalloc (strlen (path
) + extra
+ 1);
637 for (q
= ret
, p
= path
; ; )
640 int dos_drive
= HAS_DRIVE_SPEC (p
);
647 if (IS_DIR_SEPARATOR (*p
)
649 || (dos_drive_sysroot
650 && ld_sysroot
[0] == p
[-2])))
652 if (dos_drive
&& dos_drive_sysroot
)
654 strcpy (q
, ld_sysroot
+ 2);
659 strcpy (q
, ld_sysroot
);
663 end
= strchr (p
, config
.rpath_separator
);
666 size_t n
= end
- p
+ 1;
681 /* Read the system search path the FreeBSD way rather than the Linux way. */
682 #ifdef HAVE_ELF_HINTS_H
683 #include <elf-hints.h>
685 #include "elf-hints-local.h"
689 ldelf_check_ld_elf_hints (const struct bfd_link_needed_list
*l
, int force
,
692 static bfd_boolean initialized
;
693 static const char *ld_elf_hints
;
694 struct dt_needed needed
;
701 tmppath
= concat (ld_sysroot
, _PATH_ELF_HINTS
, (const char *) NULL
);
702 f
= fopen (tmppath
, FOPEN_RB
);
706 struct elfhints_hdr hdr
;
708 if (fread (&hdr
, 1, sizeof (hdr
), f
) == sizeof (hdr
)
709 && hdr
.magic
== ELFHINTS_MAGIC
712 if (fseek (f
, hdr
.strtab
+ hdr
.dirlist
, SEEK_SET
) != -1)
716 b
= xmalloc (hdr
.dirlistlen
+ 1);
717 if (fread (b
, 1, hdr
.dirlistlen
+ 1, f
) ==
719 ld_elf_hints
= ldelf_add_sysroot (b
);
730 if (ld_elf_hints
== NULL
)
734 needed
.name
= l
->name
;
735 return ldelf_search_needed (ld_elf_hints
, &needed
, force
, FALSE
, elfsize
);
738 /* For a native linker, check the file /etc/ld.so.conf for directories
739 in which we may find shared libraries. /etc/ld.so.conf is really
740 only meaningful on Linux. */
742 struct ldelf_ld_so_conf
749 ldelf_parse_ld_so_conf (struct ldelf_ld_so_conf
*, const char *);
752 ldelf_parse_ld_so_conf_include (struct ldelf_ld_so_conf
*info
,
753 const char *filename
,
761 if (pattern
[0] != '/')
763 char *p
= strrchr (filename
, '/');
764 size_t patlen
= strlen (pattern
) + 1;
766 newp
= xmalloc (p
- filename
+ 1 + patlen
);
767 memcpy (newp
, filename
, p
- filename
+ 1);
768 memcpy (newp
+ (p
- filename
+ 1), pattern
, patlen
);
773 if (glob (pattern
, 0, NULL
, &gl
) == 0)
777 for (i
= 0; i
< gl
.gl_pathc
; ++i
)
778 ldelf_parse_ld_so_conf (info
, gl
.gl_pathv
[i
]);
782 /* If we do not have glob, treat the pattern as a literal filename. */
783 ldelf_parse_ld_so_conf (info
, pattern
);
791 ldelf_parse_ld_so_conf (struct ldelf_ld_so_conf
*info
, const char *filename
)
793 FILE *f
= fopen (filename
, FOPEN_RT
);
801 line
= xmalloc (linelen
);
806 /* Normally this would use getline(3), but we need to be portable. */
807 while ((q
= fgets (p
, linelen
- (p
- line
), f
)) != NULL
808 && strlen (q
) == linelen
- (p
- line
) - 1
809 && line
[linelen
- 2] != '\n')
811 line
= xrealloc (line
, 2 * linelen
);
812 p
= line
+ linelen
- 1;
816 if (q
== NULL
&& p
== line
)
819 p
= strchr (line
, '\n');
823 /* Because the file format does not know any form of quoting we
824 can search forward for the next '#' character and if found
825 make it terminating the line. */
826 p
= strchr (line
, '#');
830 /* Remove leading whitespace. NUL is no whitespace character. */
832 while (*p
== ' ' || *p
== '\f' || *p
== '\r' || *p
== '\t' || *p
== '\v')
835 /* If the line is blank it is ignored. */
839 if (CONST_STRNEQ (p
, "include") && (p
[7] == ' ' || p
[7] == '\t'))
845 while (*p
== ' ' || *p
== '\t')
853 while (*p
!= ' ' && *p
!= '\t' && *p
)
859 ldelf_parse_ld_so_conf_include (info
, filename
, dir
);
866 while (*p
&& *p
!= '=' && *p
!= ' ' && *p
!= '\t' && *p
!= '\f'
867 && *p
!= '\r' && *p
!= '\v')
870 while (p
!= dir
&& p
[-1] == '/')
872 if (info
->path
== NULL
)
874 info
->alloc
= p
- dir
+ 1 + 256;
875 info
->path
= xmalloc (info
->alloc
);
880 if (info
->len
+ 1 + (p
- dir
) >= info
->alloc
)
882 info
->alloc
+= p
- dir
+ 256;
883 info
->path
= xrealloc (info
->path
, info
->alloc
);
885 info
->path
[info
->len
++] = config
.rpath_separator
;
887 memcpy (info
->path
+ info
->len
, dir
, p
- dir
);
888 info
->len
+= p
- dir
;
889 info
->path
[info
->len
] = '\0';
899 ldelf_check_ld_so_conf (const struct bfd_link_needed_list
*l
, int force
,
900 int elfsize
, const char *prefix
)
902 static bfd_boolean initialized
;
903 static const char *ld_so_conf
;
904 struct dt_needed needed
;
909 struct ldelf_ld_so_conf info
;
912 info
.len
= info
.alloc
= 0;
913 tmppath
= concat (ld_sysroot
, prefix
, "/etc/ld.so.conf",
914 (const char *) NULL
);
915 if (!ldelf_parse_ld_so_conf (&info
, tmppath
))
918 tmppath
= concat (ld_sysroot
, "/etc/ld.so.conf",
919 (const char *) NULL
);
920 ldelf_parse_ld_so_conf (&info
, tmppath
);
926 ld_so_conf
= ldelf_add_sysroot (info
.path
);
932 if (ld_so_conf
== NULL
)
937 needed
.name
= l
->name
;
938 return ldelf_search_needed (ld_so_conf
, &needed
, force
, TRUE
, elfsize
);
941 /* See if an input file matches a DT_NEEDED entry by name. */
944 ldelf_check_needed (lang_input_statement_type
*s
)
948 /* Stop looking if we've found a loaded lib. */
949 if (global_found
!= NULL
950 && (bfd_elf_get_dyn_lib_class (global_found
->the_bfd
)
951 & DYN_AS_NEEDED
) == 0)
954 if (s
->filename
== NULL
|| s
->the_bfd
== NULL
)
957 /* Don't look for a second non-loaded as-needed lib. */
958 if (global_found
!= NULL
959 && (bfd_elf_get_dyn_lib_class (s
->the_bfd
) & DYN_AS_NEEDED
) != 0)
962 if (filename_cmp (s
->filename
, global_needed
->name
) == 0)
968 if (s
->flags
.search_dirs
)
970 const char *f
= strrchr (s
->filename
, '/');
972 && filename_cmp (f
+ 1, global_needed
->name
) == 0)
979 soname
= bfd_elf_get_dt_soname (s
->the_bfd
);
981 && filename_cmp (soname
, global_needed
->name
) == 0)
988 /* This is called after all the input files have been opened. */
991 ldelf_after_open (int use_libpath
, int native
, int is_linux
, int is_freebsd
,
992 int elfsize
, const char *prefix
)
994 struct bfd_link_needed_list
*needed
, *l
;
995 struct elf_link_hash_table
*htab
;
998 bfd
**save_input_bfd_tail
;
1000 after_open_default ();
1002 htab
= elf_hash_table (&link_info
);
1003 if (!is_elf_hash_table (htab
))
1006 if (command_line
.out_implib_filename
)
1008 unlink_if_ordinary (command_line
.out_implib_filename
);
1009 link_info
.out_implib_bfd
1010 = bfd_openw (command_line
.out_implib_filename
,
1011 bfd_get_target (link_info
.output_bfd
));
1013 if (link_info
.out_implib_bfd
== NULL
)
1015 einfo (_("%F%P: %s: can't open for writing: %E\n"),
1016 command_line
.out_implib_filename
);
1020 if (ldelf_emit_note_gnu_build_id
!= NULL
)
1022 /* Find an ELF input. */
1023 for (abfd
= link_info
.input_bfds
;
1024 abfd
!= (bfd
*) NULL
; abfd
= abfd
->link
.next
)
1025 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1026 && bfd_count_sections (abfd
) != 0
1027 && !bfd_input_just_syms (abfd
))
1030 /* PR 10555: If there are no ELF input files do not try to
1031 create a .note.gnu-build-id section. */
1033 || !ldelf_setup_build_id (abfd
))
1035 free ((char *) ldelf_emit_note_gnu_build_id
);
1036 ldelf_emit_note_gnu_build_id
= NULL
;
1040 get_elf_backend_data (link_info
.output_bfd
)->setup_gnu_properties (&link_info
);
1042 if (bfd_link_relocatable (&link_info
))
1044 if (link_info
.execstack
== !link_info
.noexecstack
)
1046 /* PR ld/16744: If "-z [no]execstack" has been specified on the
1047 command line and we are perfoming a relocatable link then no
1048 PT_GNU_STACK segment will be created and so the
1049 linkinfo.[no]execstack values set in _handle_option() will have no
1050 effect. Instead we create a .note.GNU-stack section in much the
1051 same way as the assembler does with its --[no]execstack option. */
1052 flagword flags
= SEC_READONLY
| (link_info
.execstack
? SEC_CODE
: 0);
1053 (void) bfd_make_section_with_flags (link_info
.input_bfds
,
1054 ".note.GNU-stack", flags
);
1059 if (!link_info
.traditional_format
)
1062 bfd_boolean warn_eh_frame
= FALSE
;
1065 for (abfd
= link_info
.input_bfds
; abfd
; abfd
= abfd
->link
.next
)
1069 if (bfd_input_just_syms (abfd
))
1072 for (s
= abfd
->sections
; s
&& type
< COMPACT_EH_HDR
; s
= s
->next
)
1074 const char *name
= bfd_section_name (s
);
1076 if (bfd_is_abs_section (s
->output_section
))
1078 if (CONST_STRNEQ (name
, ".eh_frame_entry"))
1079 type
= COMPACT_EH_HDR
;
1080 else if (strcmp (name
, ".eh_frame") == 0 && s
->size
> 8)
1081 type
= DWARF2_EH_HDR
;
1090 else if (seen_type
!= type
)
1092 einfo (_("%F%P: compact frame descriptions incompatible with"
1093 " DWARF2 .eh_frame from %pB\n"),
1094 type
== DWARF2_EH_HDR
? abfd
: elfbfd
);
1099 && (type
== COMPACT_EH_HDR
1100 || link_info
.eh_frame_hdr_type
!= 0))
1102 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
1105 warn_eh_frame
= TRUE
;
1109 if (seen_type
== COMPACT_EH_HDR
)
1110 link_info
.eh_frame_hdr_type
= COMPACT_EH_HDR
;
1114 const struct elf_backend_data
*bed
;
1116 bed
= get_elf_backend_data (elfbfd
);
1117 s
= bfd_make_section_with_flags (elfbfd
, ".eh_frame_hdr",
1118 bed
->dynamic_sec_flags
1121 && bfd_set_section_alignment (s
, 2))
1123 htab
->eh_info
.hdr_sec
= s
;
1124 warn_eh_frame
= FALSE
;
1128 einfo (_("%P: warning: cannot create .eh_frame_hdr section,"
1129 " --eh-frame-hdr ignored\n"));
1132 /* Get the list of files which appear in DT_NEEDED entries in
1133 dynamic objects included in the link (often there will be none).
1134 For each such file, we want to track down the corresponding
1135 library, and include the symbol table in the link. This is what
1136 the runtime dynamic linker will do. Tracking the files down here
1137 permits one dynamic object to include another without requiring
1138 special action by the person doing the link. Note that the
1139 needed list can actually grow while we are stepping through this
1141 save_input_bfd_tail
= link_info
.input_bfds_tail
;
1142 needed
= bfd_elf_get_needed_list (link_info
.output_bfd
, &link_info
);
1143 for (l
= needed
; l
!= NULL
; l
= l
->next
)
1145 struct bfd_link_needed_list
*ll
;
1146 struct dt_needed n
, nn
;
1149 /* If the lib that needs this one was --as-needed and wasn't
1150 found to be needed, then this lib isn't needed either. */
1152 && (bfd_elf_get_dyn_lib_class (l
->by
) & DYN_AS_NEEDED
) != 0)
1155 /* Skip the lib if --no-copy-dt-needed-entries and
1156 --allow-shlib-undefined is in effect. */
1158 && link_info
.unresolved_syms_in_shared_libs
== RM_IGNORE
1159 && (bfd_elf_get_dyn_lib_class (l
->by
) & DYN_NO_ADD_NEEDED
) != 0)
1162 /* If we've already seen this file, skip it. */
1163 for (ll
= needed
; ll
!= l
; ll
= ll
->next
)
1165 || (bfd_elf_get_dyn_lib_class (ll
->by
) & DYN_AS_NEEDED
) == 0)
1166 && strcmp (ll
->name
, l
->name
) == 0)
1171 /* See if this file was included in the link explicitly. */
1173 global_found
= NULL
;
1174 lang_for_each_input_file (ldelf_check_needed
);
1175 if (global_found
!= NULL
1176 && (bfd_elf_get_dyn_lib_class (global_found
->the_bfd
)
1177 & DYN_AS_NEEDED
) == 0)
1184 info_msg (_("%s needed by %pB\n"), l
->name
, l
->by
);
1186 /* As-needed libs specified on the command line (or linker script)
1187 take priority over libs found in search dirs. */
1188 if (global_found
!= NULL
)
1190 nn
.name
= global_found
->filename
;
1191 if (ldelf_try_needed (&nn
, TRUE
, is_linux
))
1195 /* We need to find this file and include the symbol table. We
1196 want to search for the file in the same way that the dynamic
1197 linker will search. That means that we want to use
1198 rpath_link, rpath, then the environment variable
1199 LD_LIBRARY_PATH (native only), then the DT_RPATH/DT_RUNPATH
1200 entries (native only), then the linker script LIB_SEARCH_DIRS.
1201 We do not search using the -L arguments.
1203 We search twice. The first time, we skip objects which may
1204 introduce version mismatches. The second time, we force
1205 their use. See ldelf_vercheck comment. */
1206 for (force
= 0; force
< 2; force
++)
1209 search_dirs_type
*search
;
1211 struct bfd_link_needed_list
*rp
;
1214 if (ldelf_search_needed (command_line
.rpath_link
, &n
, force
,
1220 path
= command_line
.rpath
;
1223 path
= ldelf_add_sysroot (path
);
1224 found
= ldelf_search_needed (path
, &n
, force
,
1226 free ((char *) path
);
1233 if (command_line
.rpath_link
== NULL
1234 && command_line
.rpath
== NULL
)
1236 path
= (const char *) getenv ("LD_RUN_PATH");
1238 && ldelf_search_needed (path
, &n
, force
,
1242 path
= (const char *) getenv ("LD_LIBRARY_PATH");
1244 && ldelf_search_needed (path
, &n
, force
,
1251 rp
= bfd_elf_get_runpath_list (link_info
.output_bfd
, &link_info
);
1252 for (; !found
&& rp
!= NULL
; rp
= rp
->next
)
1254 path
= ldelf_add_sysroot (rp
->name
);
1255 found
= (rp
->by
== l
->by
1256 && ldelf_search_needed (path
, &n
, force
,
1257 is_linux
, elfsize
));
1258 free ((char *) path
);
1264 && ldelf_check_ld_elf_hints (l
, force
, elfsize
))
1268 && ldelf_check_ld_so_conf (l
, force
, elfsize
, prefix
))
1272 len
= strlen (l
->name
);
1273 for (search
= search_head
; search
!= NULL
; search
= search
->next
)
1277 if (search
->cmdline
)
1279 filename
= (char *) xmalloc (strlen (search
->name
) + len
+ 2);
1280 sprintf (filename
, "%s/%s", search
->name
, l
->name
);
1282 if (ldelf_try_needed (&nn
, force
, is_linux
))
1293 einfo (_("%P: warning: %s, needed by %pB, not found "
1294 "(try using -rpath or -rpath-link)\n"),
1298 for (abfd
= link_info
.input_bfds
; abfd
; abfd
= abfd
->link
.next
)
1299 if (bfd_get_format (abfd
) == bfd_object
1300 && ((abfd
->flags
) & DYNAMIC
) != 0
1301 && bfd_get_flavour (abfd
) == bfd_target_elf_flavour
1302 && (elf_dyn_lib_class (abfd
) & (DYN_AS_NEEDED
| DYN_NO_NEEDED
)) == 0
1303 && elf_dt_name (abfd
) != NULL
)
1305 if (bfd_elf_add_dt_needed_tag (abfd
, &link_info
) < 0)
1306 einfo (_("%F%P: failed to add DT_NEEDED dynamic tag\n"));
1309 link_info
.input_bfds_tail
= save_input_bfd_tail
;
1310 *save_input_bfd_tail
= NULL
;
1312 if (link_info
.eh_frame_hdr_type
== COMPACT_EH_HDR
)
1313 if (!bfd_elf_parse_eh_frame_entries (NULL
, &link_info
))
1314 einfo (_("%F%P: failed to parse EH frame entries\n"));
1317 static bfd_size_type
1318 id_note_section_size (bfd
*abfd ATTRIBUTE_UNUSED
)
1320 const char *style
= ldelf_emit_note_gnu_build_id
;
1322 bfd_size_type build_id_size
;
1324 size
= offsetof (Elf_External_Note
, name
[sizeof "GNU"]);
1325 size
= (size
+ 3) & -(bfd_size_type
) 4;
1327 build_id_size
= compute_build_id_size (style
);
1329 size
+= build_id_size
;
1337 write_build_id (bfd
*abfd
)
1339 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1340 struct elf_obj_tdata
*t
= elf_tdata (abfd
);
1343 Elf_Internal_Shdr
*i_shdr
;
1344 unsigned char *contents
, *id_bits
;
1347 Elf_External_Note
*e_note
;
1349 style
= t
->o
->build_id
.style
;
1350 asec
= t
->o
->build_id
.sec
;
1351 if (bfd_is_abs_section (asec
->output_section
))
1353 einfo (_("%P: warning: .note.gnu.build-id section discarded,"
1354 " --build-id ignored\n"));
1357 i_shdr
= &elf_section_data (asec
->output_section
)->this_hdr
;
1359 if (i_shdr
->contents
== NULL
)
1361 if (asec
->contents
== NULL
)
1362 asec
->contents
= (unsigned char *) xmalloc (asec
->size
);
1363 contents
= asec
->contents
;
1366 contents
= i_shdr
->contents
+ asec
->output_offset
;
1368 e_note
= (Elf_External_Note
*) contents
;
1369 size
= offsetof (Elf_External_Note
, name
[sizeof "GNU"]);
1370 size
= (size
+ 3) & -(bfd_size_type
) 4;
1371 id_bits
= contents
+ size
;
1372 size
= asec
->size
- size
;
1374 bfd_h_put_32 (abfd
, sizeof "GNU", &e_note
->namesz
);
1375 bfd_h_put_32 (abfd
, size
, &e_note
->descsz
);
1376 bfd_h_put_32 (abfd
, NT_GNU_BUILD_ID
, &e_note
->type
);
1377 memcpy (e_note
->name
, "GNU", sizeof "GNU");
1379 generate_build_id (abfd
, style
, bed
->s
->checksum_contents
, id_bits
, size
);
1381 position
= i_shdr
->sh_offset
+ asec
->output_offset
;
1383 return (bfd_seek (abfd
, position
, SEEK_SET
) == 0
1384 && bfd_bwrite (contents
, size
, abfd
) == size
);
1387 /* Make .note.gnu.build-id section, and set up elf_tdata->build_id. */
1390 ldelf_setup_build_id (bfd
*ibfd
)
1396 size
= id_note_section_size (ibfd
);
1399 einfo (_("%P: warning: unrecognized --build-id style ignored\n"));
1403 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_IN_MEMORY
1404 | SEC_LINKER_CREATED
| SEC_READONLY
| SEC_DATA
);
1405 s
= bfd_make_section_with_flags (ibfd
, ".note.gnu.build-id", flags
);
1406 if (s
!= NULL
&& bfd_set_section_alignment (s
, 2))
1408 struct elf_obj_tdata
*t
= elf_tdata (link_info
.output_bfd
);
1409 t
->o
->build_id
.after_write_object_contents
= &write_build_id
;
1410 t
->o
->build_id
.style
= ldelf_emit_note_gnu_build_id
;
1411 t
->o
->build_id
.sec
= s
;
1412 elf_section_type (s
) = SHT_NOTE
;
1417 einfo (_("%P: warning: cannot create .note.gnu.build-id section,"
1418 " --build-id ignored\n"));
1422 /* Look through an expression for an assignment statement. */
1425 ldelf_find_exp_assignment (etree_type
*exp
)
1427 bfd_boolean provide
= FALSE
;
1429 switch (exp
->type
.node_class
)
1432 case etree_provided
:
1436 /* We call record_link_assignment even if the symbol is defined.
1437 This is because if it is defined by a dynamic object, we
1438 actually want to use the value defined by the linker script,
1439 not the value from the dynamic object (because we are setting
1440 symbols like etext). If the symbol is defined by a regular
1441 object, then, as it happens, calling record_link_assignment
1443 if (strcmp (exp
->assign
.dst
, ".") != 0)
1445 if (!bfd_elf_record_link_assignment (link_info
.output_bfd
,
1447 exp
->assign
.dst
, provide
,
1448 exp
->assign
.hidden
))
1449 einfo (_("%F%P: failed to record assignment to %s: %E\n"),
1452 ldelf_find_exp_assignment (exp
->assign
.src
);
1456 ldelf_find_exp_assignment (exp
->binary
.lhs
);
1457 ldelf_find_exp_assignment (exp
->binary
.rhs
);
1461 ldelf_find_exp_assignment (exp
->trinary
.cond
);
1462 ldelf_find_exp_assignment (exp
->trinary
.lhs
);
1463 ldelf_find_exp_assignment (exp
->trinary
.rhs
);
1467 ldelf_find_exp_assignment (exp
->unary
.child
);
1475 /* This is called by the before_allocation routine via
1476 lang_for_each_statement. It locates any assignment statements, and
1477 tells the ELF backend about them, in case they are assignments to
1478 symbols which are referred to by dynamic objects. */
1481 ldelf_find_statement_assignment (lang_statement_union_type
*s
)
1483 if (s
->header
.type
== lang_assignment_statement_enum
)
1484 ldelf_find_exp_assignment (s
->assignment_statement
.exp
);
1487 /* Used by before_allocation and handle_option. */
1490 ldelf_append_to_separated_string (char **to
, char *op_arg
)
1493 *to
= xstrdup (op_arg
);
1496 size_t to_len
= strlen (*to
);
1497 size_t op_arg_len
= strlen (op_arg
);
1501 /* First see whether OPTARG is already in the path. */
1504 if (strncmp (op_arg
, cp
, op_arg_len
) == 0
1505 && (cp
[op_arg_len
] == 0
1506 || cp
[op_arg_len
] == config
.rpath_separator
))
1510 /* Not yet found. */
1511 cp
= strchr (cp
, config
.rpath_separator
);
1519 buf
= xmalloc (to_len
+ op_arg_len
+ 2);
1520 sprintf (buf
, "%s%c%s", *to
,
1521 config
.rpath_separator
, op_arg
);
1528 /* This is called after the sections have been attached to output
1529 sections, but before any sizes or addresses have been set. */
1532 ldelf_before_allocation (char *audit
, char *depaudit
,
1533 const char *default_interpreter_name
)
1538 struct bfd_link_hash_entry
*ehdr_start
= NULL
;
1539 unsigned char ehdr_start_save_type
= 0;
1540 char ehdr_start_save_u
[sizeof ehdr_start
->u
1541 - sizeof ehdr_start
->u
.def
.next
] = "";
1543 if (is_elf_hash_table (link_info
.hash
))
1545 _bfd_elf_tls_setup (link_info
.output_bfd
, &link_info
);
1547 /* Make __ehdr_start hidden if it has been referenced, to
1548 prevent the symbol from being dynamic. */
1549 if (!bfd_link_relocatable (&link_info
))
1551 struct elf_link_hash_table
*htab
= elf_hash_table (&link_info
);
1552 struct elf_link_hash_entry
*h
1553 = elf_link_hash_lookup (htab
, "__ehdr_start", FALSE
, FALSE
, TRUE
);
1555 /* Only adjust the export class if the symbol was referenced
1556 and not defined, otherwise leave it alone. */
1558 && (h
->root
.type
== bfd_link_hash_new
1559 || h
->root
.type
== bfd_link_hash_undefined
1560 || h
->root
.type
== bfd_link_hash_undefweak
1561 || h
->root
.type
== bfd_link_hash_common
))
1563 const struct elf_backend_data
*bed
;
1564 bed
= get_elf_backend_data (link_info
.output_bfd
);
1565 (*bed
->elf_backend_hide_symbol
) (&link_info
, h
, TRUE
);
1566 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
1567 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
1568 /* Don't leave the symbol undefined. Undefined hidden
1569 symbols typically won't have dynamic relocations, but
1570 we most likely will need dynamic relocations for
1571 __ehdr_start if we are building a PIE or shared
1573 ehdr_start
= &h
->root
;
1574 ehdr_start_save_type
= ehdr_start
->type
;
1575 memcpy (ehdr_start_save_u
,
1576 (char *) &ehdr_start
->u
+ sizeof ehdr_start
->u
.def
.next
,
1577 sizeof ehdr_start_save_u
);
1578 ehdr_start
->type
= bfd_link_hash_defined
;
1579 ehdr_start
->u
.def
.section
= bfd_abs_section_ptr
;
1580 ehdr_start
->u
.def
.value
= 0;
1584 /* If we are going to make any variable assignments, we need to
1585 let the ELF backend know about them in case the variables are
1586 referred to by dynamic objects. */
1587 lang_for_each_statement (ldelf_find_statement_assignment
);
1590 /* Let the ELF backend work out the sizes of any sections required
1591 by dynamic linking. */
1592 rpath
= command_line
.rpath
;
1594 rpath
= (const char *) getenv ("LD_RUN_PATH");
1596 for (abfd
= link_info
.input_bfds
; abfd
; abfd
= abfd
->link
.next
)
1597 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
1599 const char *audit_libs
= elf_dt_audit (abfd
);
1601 /* If the input bfd contains an audit entry, we need to add it as
1602 a dep audit entry. */
1603 if (audit_libs
&& *audit_libs
!= '\0')
1605 char *cp
= xstrdup (audit_libs
);
1609 char *cp2
= strchr (cp
, config
.rpath_separator
);
1617 if (cp
!= NULL
&& *cp
!= '\0')
1618 ldelf_append_to_separated_string (&depaudit
, cp
);
1620 cp
= more
? ++cp2
: NULL
;
1626 if (! (bfd_elf_size_dynamic_sections
1627 (link_info
.output_bfd
, command_line
.soname
, rpath
,
1628 command_line
.filter_shlib
, audit
, depaudit
,
1629 (const char * const *) command_line
.auxiliary_filters
,
1630 &link_info
, &sinterp
)))
1631 einfo (_("%F%P: failed to set dynamic section sizes: %E\n"));
1633 if (sinterp
!= NULL
)
1635 /* Let the user override the dynamic linker we are using. */
1636 if (command_line
.interpreter
!= NULL
)
1637 default_interpreter_name
= command_line
.interpreter
;
1638 if (default_interpreter_name
!= NULL
)
1640 sinterp
->contents
= (bfd_byte
*) default_interpreter_name
;
1641 sinterp
->size
= strlen ((char *) sinterp
->contents
) + 1;
1645 /* Look for any sections named .gnu.warning. As a GNU extensions,
1646 we treat such sections as containing warning messages. We print
1647 out the warning message, and then zero out the section size so
1648 that it does not get copied into the output file. */
1651 LANG_FOR_EACH_INPUT_STATEMENT (is
)
1657 if (is
->flags
.just_syms
)
1660 s
= bfd_get_section_by_name (is
->the_bfd
, ".gnu.warning");
1665 msg
= (char *) xmalloc ((size_t) (sz
+ 1));
1666 if (! bfd_get_section_contents (is
->the_bfd
, s
, msg
,
1668 einfo (_("%F%P: %pB: can't read contents of section .gnu.warning: %E\n"),
1671 (*link_info
.callbacks
->warning
) (&link_info
, msg
,
1672 (const char *) NULL
, is
->the_bfd
,
1673 (asection
*) NULL
, (bfd_vma
) 0);
1676 /* Clobber the section size, so that we don't waste space
1677 copying the warning into the output file. If we've already
1678 sized the output section, adjust its size. The adjustment
1679 is on rawsize because targets that size sections early will
1680 have called lang_reset_memory_regions after sizing. */
1681 if (s
->output_section
!= NULL
1682 && s
->output_section
->rawsize
>= s
->size
)
1683 s
->output_section
->rawsize
-= s
->size
;
1687 /* Also set SEC_EXCLUDE, so that local symbols defined in the
1688 warning section don't get copied to the output. */
1689 s
->flags
|= SEC_EXCLUDE
| SEC_KEEP
;
1693 before_allocation_default ();
1695 if (!bfd_elf_size_dynsym_hash_dynstr (link_info
.output_bfd
, &link_info
))
1696 einfo (_("%F%P: failed to set dynamic section sizes: %E\n"));
1698 if (ehdr_start
!= NULL
)
1700 /* If we twiddled __ehdr_start to defined earlier, put it back
1702 ehdr_start
->type
= ehdr_start_save_type
;
1703 memcpy ((char *) &ehdr_start
->u
+ sizeof ehdr_start
->u
.def
.next
,
1705 sizeof ehdr_start_save_u
);
1708 /* Try to open a dynamic archive. This is where we know that ELF
1709 dynamic libraries have an extension of .so (or .sl on oddball systems
1713 ldelf_open_dynamic_archive (const char *arch
, search_dirs_type
*search
,
1714 lang_input_statement_type
*entry
)
1716 const char *filename
;
1719 bfd_boolean opened
= FALSE
;
1721 if (! entry
->flags
.maybe_archive
)
1724 filename
= entry
->filename
;
1725 len
= strlen (search
->name
) + strlen (filename
);
1726 if (entry
->flags
.full_name_provided
)
1729 string
= (char *) xmalloc (len
);
1730 sprintf (string
, "%s/%s", search
->name
, filename
);
1736 len
+= strlen (arch
) + sizeof "/lib.so";
1737 #ifdef EXTRA_SHLIB_EXTENSION
1738 xlen
= (strlen (EXTRA_SHLIB_EXTENSION
) > 3
1739 ? strlen (EXTRA_SHLIB_EXTENSION
) - 3
1742 string
= (char *) xmalloc (len
+ xlen
);
1743 sprintf (string
, "%s/lib%s%s.so", search
->name
, filename
, arch
);
1744 #ifdef EXTRA_SHLIB_EXTENSION
1745 /* Try the .so extension first. If that fails build a new filename
1746 using EXTRA_SHLIB_EXTENSION. */
1747 opened
= ldfile_try_open_bfd (string
, entry
);
1749 strcpy (string
+ len
- 4, EXTRA_SHLIB_EXTENSION
);
1753 if (!opened
&& !ldfile_try_open_bfd (string
, entry
))
1759 entry
->filename
= string
;
1761 /* We have found a dynamic object to include in the link. The ELF
1762 backend linker will create a DT_NEEDED entry in the .dynamic
1763 section naming this file. If this file includes a DT_SONAME
1764 entry, it will be used. Otherwise, the ELF linker will just use
1765 the name of the file. For an archive found by searching, like
1766 this one, the DT_NEEDED entry should consist of just the name of
1767 the file, without the path information used to find it. Note
1768 that we only need to do this if we have a dynamic object; an
1769 archive will never be referenced by a DT_NEEDED entry.
1771 FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
1772 very pretty. I haven't been able to think of anything that is
1774 if (bfd_check_format (entry
->the_bfd
, bfd_object
)
1775 && (entry
->the_bfd
->flags
& DYNAMIC
) != 0)
1777 ASSERT (entry
->flags
.maybe_archive
&& entry
->flags
.search_dirs
);
1779 /* Rather than duplicating the logic above. Just use the
1780 filename we recorded earlier. */
1782 if (!entry
->flags
.full_name_provided
)
1783 filename
= lbasename (entry
->filename
);
1784 bfd_elf_set_dt_needed_name (entry
->the_bfd
, filename
);
1790 /* A variant of lang_output_section_find used by place_orphan. */
1792 static lang_output_section_statement_type
*
1793 output_rel_find (int isdyn
, int rela
)
1795 lang_output_section_statement_type
*lookup
;
1796 lang_output_section_statement_type
*last
= NULL
;
1797 lang_output_section_statement_type
*last_alloc
= NULL
;
1798 lang_output_section_statement_type
*last_ro_alloc
= NULL
;
1799 lang_output_section_statement_type
*last_rel
= NULL
;
1800 lang_output_section_statement_type
*last_rel_alloc
= NULL
;
1802 for (lookup
= (void *) lang_os_list
.head
;
1804 lookup
= lookup
->next
)
1806 if (lookup
->constraint
>= 0
1807 && CONST_STRNEQ (lookup
->name
, ".rel"))
1809 int lookrela
= lookup
->name
[4] == 'a';
1811 /* .rel.dyn must come before all other reloc sections, to suit
1816 /* Don't place after .rel.plt as doing so results in wrong
1818 if (strcmp (".plt", lookup
->name
+ 4 + lookrela
) == 0)
1821 if (rela
== lookrela
|| last_rel
== NULL
)
1823 if ((rela
== lookrela
|| last_rel_alloc
== NULL
)
1824 && lookup
->bfd_section
!= NULL
1825 && (lookup
->bfd_section
->flags
& SEC_ALLOC
) != 0)
1826 last_rel_alloc
= lookup
;
1830 if (lookup
->bfd_section
!= NULL
1831 && (lookup
->bfd_section
->flags
& SEC_ALLOC
) != 0)
1833 last_alloc
= lookup
;
1834 if ((lookup
->bfd_section
->flags
& SEC_READONLY
) != 0)
1835 last_ro_alloc
= lookup
;
1840 return last_rel_alloc
;
1846 return last_ro_alloc
;
1854 /* Return whether IN is suitable to be part of OUT. */
1857 elf_orphan_compatible (asection
*in
, asection
*out
)
1859 /* Non-zero sh_info implies a section with SHF_INFO_LINK with
1860 unknown semantics for the generic linker, or a SHT_REL/SHT_RELA
1861 section where sh_info specifies a symbol table. (We won't see
1862 SHT_GROUP, SHT_SYMTAB or SHT_DYNSYM sections here.) We clearly
1863 can't merge SHT_REL/SHT_RELA using differing symbol tables, and
1864 shouldn't merge sections with differing unknown semantics. */
1865 if (elf_section_data (out
)->this_hdr
.sh_info
1866 != elf_section_data (in
)->this_hdr
.sh_info
)
1868 /* We can't merge with a member of an output section group or merge
1869 two sections with differing SHF_EXCLUDE or other processor and OS
1870 specific flags when doing a relocatable link. */
1871 if (bfd_link_relocatable (&link_info
)
1872 && (elf_next_in_group (out
) != NULL
1873 || ((elf_section_flags (out
) ^ elf_section_flags (in
))
1874 & (SHF_MASKPROC
| SHF_MASKOS
)) != 0))
1876 return _bfd_elf_match_sections_by_type (link_info
.output_bfd
, out
,
1880 /* Place an orphan section. We use this to put random SHF_ALLOC
1881 sections in the right segment. */
1883 lang_output_section_statement_type
*
1884 ldelf_place_orphan (asection
*s
, const char *secname
, int constraint
)
1886 static struct orphan_save hold
[] =
1889 SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
| SEC_CODE
,
1892 SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
| SEC_DATA
,
1895 SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_DATA
| SEC_THREAD_LOCAL
,
1898 SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_DATA
,
1904 SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
| SEC_DATA
,
1907 SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
| SEC_DATA
,
1910 SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_DATA
| SEC_SMALL_DATA
,
1916 enum orphan_save_index
1928 static int orphan_init_done
= 0;
1929 struct orphan_save
*place
;
1930 lang_output_section_statement_type
*after
;
1931 lang_output_section_statement_type
*os
;
1932 lang_output_section_statement_type
*match_by_name
= NULL
;
1934 int elfinput
= s
->owner
->xvec
->flavour
== bfd_target_elf_flavour
;
1935 int elfoutput
= link_info
.output_bfd
->xvec
->flavour
== bfd_target_elf_flavour
;
1936 unsigned int sh_type
= elfinput
? elf_section_type (s
) : SHT_NULL
;
1940 if (!bfd_link_relocatable (&link_info
)
1941 && link_info
.combreloc
1942 && (s
->flags
& SEC_ALLOC
))
1948 secname
= ".rela.dyn";
1952 secname
= ".rel.dyn";
1958 else if (CONST_STRNEQ (secname
, ".rel"))
1960 secname
= secname
[4] == 'a' ? ".rela.dyn" : ".rel.dyn";
1965 if (!bfd_link_relocatable (&link_info
)
1968 && (s
->flags
& SEC_ALLOC
) != 0
1969 && (elf_tdata (s
->owner
)->has_gnu_osabi
& elf_gnu_osabi_mbind
) != 0
1970 && (elf_section_flags (s
) & SHF_GNU_MBIND
) != 0)
1972 /* Find the output mbind section with the same type, attributes
1973 and sh_info field. */
1974 for (os
= (void *) lang_os_list
.head
;
1977 if (os
->bfd_section
!= NULL
1978 && !bfd_is_abs_section (os
->bfd_section
)
1979 && (elf_section_flags (os
->bfd_section
) & SHF_GNU_MBIND
) != 0
1980 && ((s
->flags
& (SEC_ALLOC
1985 == (os
->bfd_section
->flags
& (SEC_ALLOC
1990 && (elf_section_data (os
->bfd_section
)->this_hdr
.sh_info
1991 == elf_section_data (s
)->this_hdr
.sh_info
))
1993 lang_add_section (&os
->children
, s
, NULL
, os
);
1997 /* Create the output mbind section with the ".mbind." prefix
1999 if ((s
->flags
& (SEC_LOAD
| SEC_HAS_CONTENTS
)) == 0)
2000 secname
= ".mbind.bss";
2001 else if ((s
->flags
& SEC_READONLY
) == 0)
2002 secname
= ".mbind.data";
2003 else if ((s
->flags
& SEC_CODE
) == 0)
2004 secname
= ".mbind.rodata";
2006 secname
= ".mbind.text";
2007 elf_tdata (link_info
.output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_mbind
;
2010 /* Look through the script to see where to place this section. The
2011 script includes entries added by previous lang_insert_orphan
2012 calls, so this loop puts multiple compatible orphans of the same
2013 name into a single output section. */
2014 if (constraint
== 0)
2015 for (os
= lang_output_section_find (secname
);
2017 os
= next_matching_output_section_statement (os
, 0))
2019 /* If we don't match an existing output section, tell
2020 lang_insert_orphan to create a new output section. */
2021 constraint
= SPECIAL
;
2023 /* Check to see if we already have an output section statement
2024 with this name, and its bfd section has compatible flags.
2025 If the section already exists but does not have any flags
2026 set, then it has been created by the linker, possibly as a
2027 result of a --section-start command line switch. */
2028 if (os
->bfd_section
!= NULL
2029 && (os
->bfd_section
->flags
== 0
2030 || (((s
->flags
^ os
->bfd_section
->flags
)
2031 & (SEC_LOAD
| SEC_ALLOC
)) == 0
2034 || elf_orphan_compatible (s
, os
->bfd_section
)))))
2036 lang_add_section (&os
->children
, s
, NULL
, os
);
2040 /* Save unused output sections in case we can match them
2041 against orphans later. */
2042 if (os
->bfd_section
== NULL
)
2046 /* If we didn't match an active output section, see if we matched an
2047 unused one and use that. */
2050 lang_add_section (&match_by_name
->children
, s
, NULL
, match_by_name
);
2051 return match_by_name
;
2054 if (!orphan_init_done
)
2056 struct orphan_save
*ho
;
2058 for (ho
= hold
; ho
< hold
+ sizeof (hold
) / sizeof (hold
[0]); ++ho
)
2059 if (ho
->name
!= NULL
)
2061 ho
->os
= lang_output_section_find (ho
->name
);
2062 if (ho
->os
!= NULL
&& ho
->os
->flags
== 0)
2063 ho
->os
->flags
= ho
->flags
;
2065 orphan_init_done
= 1;
2068 /* If this is a final link, then always put .gnu.warning.SYMBOL
2069 sections into the .text section to get them out of the way. */
2070 if (bfd_link_executable (&link_info
)
2071 && CONST_STRNEQ (s
->name
, ".gnu.warning.")
2072 && hold
[orphan_text
].os
!= NULL
)
2074 os
= hold
[orphan_text
].os
;
2075 lang_add_section (&os
->children
, s
, NULL
, os
);
2080 if (!bfd_link_relocatable (&link_info
))
2083 while ((nexts
= bfd_get_next_section_by_name (nexts
->owner
, nexts
))
2085 if (nexts
->output_section
== NULL
2086 && (nexts
->flags
& SEC_EXCLUDE
) == 0
2087 && ((nexts
->flags
^ flags
) & (SEC_LOAD
| SEC_ALLOC
)) == 0
2088 && (nexts
->owner
->flags
& DYNAMIC
) == 0
2089 && !bfd_input_just_syms (nexts
->owner
)
2090 && _bfd_elf_match_sections_by_type (nexts
->owner
, nexts
,
2092 flags
= (((flags
^ SEC_READONLY
)
2093 | (nexts
->flags
^ SEC_READONLY
))
2097 /* Decide which segment the section should go in based on the
2098 section name and section flags. We put loadable .note sections
2099 right after the .interp section, so that the PT_NOTE segment is
2100 stored right after the program headers where the OS can read it
2101 in the first page. */
2104 if ((flags
& (SEC_ALLOC
| SEC_DEBUGGING
)) == 0)
2105 place
= &hold
[orphan_nonalloc
];
2106 else if ((flags
& SEC_ALLOC
) == 0)
2108 else if ((flags
& SEC_LOAD
) != 0
2110 ? sh_type
== SHT_NOTE
2111 : CONST_STRNEQ (secname
, ".note")))
2112 place
= &hold
[orphan_interp
];
2113 else if ((flags
& (SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_THREAD_LOCAL
)) == 0)
2114 place
= &hold
[orphan_bss
];
2115 else if ((flags
& SEC_SMALL_DATA
) != 0)
2116 place
= &hold
[orphan_sdata
];
2117 else if ((flags
& SEC_THREAD_LOCAL
) != 0)
2118 place
= &hold
[orphan_tdata
];
2119 else if ((flags
& SEC_READONLY
) == 0)
2120 place
= &hold
[orphan_data
];
2121 else if ((flags
& SEC_LOAD
) != 0
2123 ? sh_type
== SHT_RELA
|| sh_type
== SHT_REL
2124 : CONST_STRNEQ (secname
, ".rel")))
2125 place
= &hold
[orphan_rel
];
2126 else if ((flags
& SEC_CODE
) == 0)
2127 place
= &hold
[orphan_rodata
];
2129 place
= &hold
[orphan_text
];
2134 if (place
->os
== NULL
)
2136 if (place
->name
!= NULL
)
2137 place
->os
= lang_output_section_find (place
->name
);
2140 int rela
= elfinput
? sh_type
== SHT_RELA
: secname
[4] == 'a';
2141 place
->os
= output_rel_find (isdyn
, rela
);
2147 = lang_output_section_find_by_flags (s
, flags
, &place
->os
,
2148 _bfd_elf_match_sections_by_type
);
2150 /* *ABS* is always the first output section statement. */
2151 after
= (void *) lang_os_list
.head
;
2154 return lang_insert_orphan (s
, secname
, constraint
, after
, place
, NULL
, NULL
);
2158 ldelf_before_place_orphans (void)
2162 for (abfd
= link_info
.input_bfds
;
2163 abfd
!= (bfd
*) NULL
; abfd
= abfd
->link
.next
)
2164 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
2165 && bfd_count_sections (abfd
) != 0
2166 && !bfd_input_just_syms (abfd
))
2169 for (isec
= abfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
2171 /* Discard a section if any of its linked-to section has
2173 asection
*linked_to_sec
;
2174 for (linked_to_sec
= elf_linked_to_section (isec
);
2175 linked_to_sec
!= NULL
;
2176 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
2177 if (discarded_section (linked_to_sec
))
2179 isec
->output_section
= bfd_abs_section_ptr
;