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075a2b89 1/* ELF emulation code for targets using elf.em.
b3adc24a 2 Copyright (C) 1991-2020 Free Software Foundation, Inc.
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3
4 This file is part of the GNU Binutils.
5
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.
10
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.
15
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. */
20
21#include "sysdep.h"
22#include "bfd.h"
23#include "libiberty.h"
24#include "filenames.h"
0aa0727c 25#include "safe-ctype.h"
0b4453c7 26#include "bfdlink.h"
1ff6de03 27#include "ctf-api.h"
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28#include "ld.h"
29#include "ldmain.h"
30#include "ldmisc.h"
31#include "ldexp.h"
32#include "ldlang.h"
33#include "ldfile.h"
34#include "ldemul.h"
35#include "ldbuildid.h"
36#include <ldgram.h>
37#include "elf-bfd.h"
38#ifdef HAVE_GLOB
39#include <glob.h>
40#endif
41#include "ldelf.h"
42
43struct dt_needed
44{
45 bfd *by;
46 const char *name;
47};
48
49/* Style of .note.gnu.build-id section. */
50const char *ldelf_emit_note_gnu_build_id;
51
52/* These variables are required to pass information back and forth
53 between after_open and check_needed and stat_needed and vercheck. */
54
55static struct bfd_link_needed_list *global_needed;
56static lang_input_statement_type *global_found;
57static struct stat global_stat;
58static struct bfd_link_needed_list *global_vercheck_needed;
59static bfd_boolean global_vercheck_failed;
60
61void
62ldelf_after_parse (void)
63{
64 if (bfd_link_pie (&link_info))
65 link_info.flags_1 |= (bfd_vma) DF_1_PIE;
66
67 if (bfd_link_executable (&link_info)
68 && link_info.nointerp)
69 {
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;
73 }
74 after_parse_default ();
75}
76
77/* Handle the generation of DT_NEEDED tags. */
78
79bfd_boolean
80ldelf_load_symbols (lang_input_statement_type *entry)
81{
82 int link_class = 0;
83
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;
89
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
92 this file at all. */
93 if (!entry->flags.add_DT_NEEDED_for_dynamic)
94 link_class |= DYN_NO_ADD_NEEDED;
95
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"),
99 entry->the_bfd);
100
101 if (link_class == 0
102 || (bfd_get_file_flags (entry->the_bfd) & DYNAMIC) == 0)
103 return FALSE;
104
105 bfd_elf_set_dyn_lib_class (entry->the_bfd,
106 (enum dynamic_lib_link_class) link_class);
107
108 /* Continue on with normal load_symbols processing. */
109 return FALSE;
110}
111
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.
117
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
122 link path.
123
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. */
128
129static void
130ldelf_vercheck (lang_input_statement_type *s)
131{
132 const char *soname;
133 struct bfd_link_needed_list *l;
134
135 if (global_vercheck_failed)
136 return;
137 if (s->the_bfd == NULL
138 || (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0)
139 return;
140
141 soname = bfd_elf_get_dt_soname (s->the_bfd);
142 if (soname == NULL)
143 soname = lbasename (bfd_get_filename (s->the_bfd));
144
145 for (l = global_vercheck_needed; l != NULL; l = l->next)
146 {
147 const char *suffix;
148
149 if (filename_cmp (soname, l->name) == 0)
150 {
151 /* Probably can't happen, but it's an easy check. */
152 continue;
153 }
154
155 if (strchr (l->name, '/') != NULL)
156 continue;
157
158 suffix = strstr (l->name, ".so.");
159 if (suffix == NULL)
160 continue;
161
162 suffix += sizeof ".so." - 1;
163
164 if (filename_ncmp (soname, l->name, suffix - l->name) == 0)
165 {
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;
172 return;
173 }
174 }
175}
176
177
178/* See if an input file matches a DT_NEEDED entry by running stat on
179 the file. */
180
181static void
182ldelf_stat_needed (lang_input_statement_type *s)
183{
184 struct stat st;
185 const char *suffix;
186 const char *soname;
187
188 if (global_found != NULL)
189 return;
190 if (s->the_bfd == NULL)
191 return;
192
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)
196 return;
197
198 if (bfd_stat (s->the_bfd, &st) != 0)
199 {
200 einfo (_("%P: %pB: bfd_stat failed: %E\n"), s->the_bfd);
201 return;
202 }
203
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
210 negatives. */
211 if (st.st_dev == global_stat.st_dev
212 && st.st_ino == global_stat.st_ino
213 && st.st_ino != 0)
214 {
215 global_found = s;
216 return;
217 }
218
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. */
227
228 if (strchr (global_needed->name, '/') != NULL)
229 return;
230 suffix = strstr (global_needed->name, ".so.");
231 if (suffix == NULL)
232 return;
233 suffix += sizeof ".so." - 1;
234
235 soname = bfd_elf_get_dt_soname (s->the_bfd);
236 if (soname == NULL)
237 soname = lbasename (s->filename);
238
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);
243}
244
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. */
248
249static bfd_boolean
250ldelf_try_needed (struct dt_needed *needed, int force, int is_linux)
251{
252 bfd *abfd;
253 const char *name = needed->name;
254 const char *soname;
255 int link_class;
256
257 abfd = bfd_openr (name, bfd_get_target (link_info.output_bfd));
258 if (abfd == NULL)
259 {
260 if (verbose)
261 info_msg (_("attempt to open %s failed\n"), name);
262 return FALSE;
263 }
264
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265 track_dependency_files (name);
266
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267 /* Linker needs to decompress sections. */
268 abfd->flags |= BFD_DECOMPRESS;
269
270 if (! bfd_check_format (abfd, bfd_object))
271 {
272 bfd_close (abfd);
273 return FALSE;
274 }
275 if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
276 {
277 bfd_close (abfd);
278 return FALSE;
279 }
280
281 /* For DT_NEEDED, they have to match. */
282 if (abfd->xvec != link_info.output_bfd->xvec)
283 {
284 bfd_close (abfd);
285 return FALSE;
286 }
287
288 /* Check whether this object would include any conflicting library
289 versions. If FORCE is set, then we skip this check; we use this
290 the second time around, if we couldn't find any compatible
291 instance of the shared library. */
292
293 if (!force)
294 {
295 struct bfd_link_needed_list *needs;
296
297 if (! bfd_elf_get_bfd_needed_list (abfd, &needs))
298 einfo (_("%F%P: %pB: bfd_elf_get_bfd_needed_list failed: %E\n"), abfd);
299
300 if (needs != NULL)
301 {
302 global_vercheck_needed = needs;
303 global_vercheck_failed = FALSE;
304 lang_for_each_input_file (ldelf_vercheck);
305 if (global_vercheck_failed)
306 {
307 bfd_close (abfd);
308 /* Return FALSE to force the caller to move on to try
309 another file on the search path. */
310 return FALSE;
311 }
312
313 /* But wait! It gets much worse. On Linux, if a shared
314 library does not use libc at all, we are supposed to skip
315 it the first time around in case we encounter a shared
316 library later on with the same name which does use the
317 version of libc that we want. This is much too horrible
318 to use on any system other than Linux. */
319 if (is_linux)
320 {
321 struct bfd_link_needed_list *l;
322
323 for (l = needs; l != NULL; l = l->next)
324 if (CONST_STRNEQ (l->name, "libc.so"))
325 break;
326 if (l == NULL)
327 {
328 bfd_close (abfd);
329 return FALSE;
330 }
331 }
332 }
333 }
334
335 /* We've found a dynamic object matching the DT_NEEDED entry. */
336
337 /* We have already checked that there is no other input file of the
338 same name. We must now check again that we are not including the
339 same file twice. We need to do this because on many systems
340 libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will
341 reference libc.so.1. If we have already included libc.so, we
342 don't want to include libc.so.1 if they are the same file, and we
343 can only check that using stat. */
344
345 if (bfd_stat (abfd, &global_stat) != 0)
346 einfo (_("%F%P: %pB: bfd_stat failed: %E\n"), abfd);
347
348 /* First strip off everything before the last '/'. */
349 soname = lbasename (bfd_get_filename (abfd));
350
351 if (verbose)
352 info_msg (_("found %s at %s\n"), soname, name);
353
354 global_found = NULL;
355 lang_for_each_input_file (ldelf_stat_needed);
356 if (global_found != NULL)
357 {
358 /* Return TRUE to indicate that we found the file, even though
359 we aren't going to do anything with it. */
360 return TRUE;
361 }
362
363 /* Specify the soname to use. */
364 bfd_elf_set_dt_needed_name (abfd, soname);
365
366 /* Tell the ELF linker that we don't want the output file to have a
367 DT_NEEDED entry for this file, unless it is used to resolve
368 references in a regular object. */
369 link_class = DYN_DT_NEEDED;
370
371 /* Tell the ELF linker that we don't want the output file to have a
372 DT_NEEDED entry for this file at all if the entry is from a file
373 with DYN_NO_ADD_NEEDED. */
374 if (needed->by != NULL
375 && (bfd_elf_get_dyn_lib_class (needed->by) & DYN_NO_ADD_NEEDED) != 0)
376 link_class |= DYN_NO_NEEDED | DYN_NO_ADD_NEEDED;
377
378 bfd_elf_set_dyn_lib_class (abfd, (enum dynamic_lib_link_class) link_class);
379
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380 *link_info.input_bfds_tail = abfd;
381 link_info.input_bfds_tail = &abfd->link.next;
382
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383 /* Add this file into the symbol table. */
384 if (! bfd_link_add_symbols (abfd, &link_info))
385 einfo (_("%F%P: %pB: error adding symbols: %E\n"), abfd);
386
387 return TRUE;
388}
389
390/* Search for a needed file in a path. */
391
392static bfd_boolean
393ldelf_search_needed (const char *path, struct dt_needed *n, int force,
394 int is_linux, int elfsize)
395{
396 const char *s;
397 const char *name = n->name;
398 size_t len;
399 struct dt_needed needed;
400
401 if (name[0] == '/')
402 return ldelf_try_needed (n, force, is_linux);
403
404 if (path == NULL || *path == '\0')
405 return FALSE;
406
407 needed.by = n->by;
408 needed.name = n->name;
409
410 len = strlen (name);
411 while (1)
412 {
413 unsigned offset = 0;
414 char * var;
415 char *filename, *sset;
416
417 s = strchr (path, config.rpath_separator);
418 if (s == NULL)
419 s = path + strlen (path);
420
421#if HAVE_DOS_BASED_FILE_SYSTEM
422 /* Assume a match on the second char is part of drive specifier. */
423 else if (config.rpath_separator == ':'
424 && s == path + 1
425 && ISALPHA (*path))
426 {
427 s = strchr (s + 1, config.rpath_separator);
428 if (s == NULL)
429 s = path + strlen (path);
430 }
431#endif
432 filename = (char *) xmalloc (s - path + len + 2);
433 if (s == path)
434 sset = filename;
435 else
436 {
437 memcpy (filename, path, s - path);
438 filename[s - path] = '/';
439 sset = filename + (s - path) + 1;
440 }
441 strcpy (sset, name);
442
443 /* PR 20535: Support the same pseudo-environment variables that
444 are supported by ld.so. Namely, $ORIGIN, $LIB and $PLATFORM.
445 Since there can be more than one occurrence of these tokens in
446 the path we loop until no more are found. Since we might not
447 be able to substitute some of the tokens we maintain an offset
448 into the filename for where we should begin our scan. */
449 while ((var = strchr (filename + offset, '$')) != NULL)
450 {
451 /* The ld.so manual page does not say, but I am going to assume that
452 these tokens are terminated by a directory separator character
453 (/) or the end of the string. There is also an implication that
454 $ORIGIN should only be used at the start of a path, but that is
455 not enforced here.
456
457 The ld.so manual page also states that it allows ${ORIGIN},
458 ${LIB} and ${PLATFORM}, so these are supported as well.
459
460 FIXME: The code could be a lot cleverer about allocating space
461 for the processed string. */
462 char * end = strchr (var, '/');
463 const char *replacement = NULL;
464 char * v = var + 1;
465 char * freeme = NULL;
466 unsigned flen = strlen (filename);
467
468 if (end != NULL)
469 /* Temporarily terminate the filename at the end of the token. */
470 * end = 0;
471
472 if (*v == '{')
473 ++ v;
474 switch (*v++)
475 {
476 case 'O':
477 if (strcmp (v, "RIGIN") == 0 || strcmp (v, "RIGIN}") == 0)
478 {
479 /* ORIGIN - replace with the full path to the directory
480 containing the program or shared object. */
481 if (needed.by == NULL)
482 {
483 if (link_info.output_bfd == NULL)
484 {
485 break;
486 }
487 else
488 replacement = bfd_get_filename (link_info.output_bfd);
489 }
490 else
491 replacement = bfd_get_filename (needed.by);
492
493 if (replacement)
494 {
495 char * slash;
496
497 if (replacement[0] == '/')
498 freeme = xstrdup (replacement);
499 else
500 {
501 char * current_dir = getpwd ();
502
503 freeme = xmalloc (strlen (replacement)
504 + strlen (current_dir) + 2);
505 sprintf (freeme, "%s/%s", current_dir, replacement);
506 }
507
508 replacement = freeme;
509 if ((slash = strrchr (replacement, '/')) != NULL)
510 * slash = 0;
511 }
512 }
513 break;
514
515 case 'L':
516 if (strcmp (v, "IB") == 0 || strcmp (v, "IB}") == 0)
517 {
518 /* LIB - replace with "lib" in 32-bit environments
519 and "lib64" in 64-bit environments. */
520
521 switch (elfsize)
522 {
523 case 32: replacement = "lib"; break;
524 case 64: replacement = "lib64"; break;
525 default:
526 abort ();
527 }
528 }
529 break;
530
531 case 'P':
532 /* Supporting $PLATFORM in a cross-hosted environment is not
533 possible. Supporting it in a native environment involves
534 loading the <sys/auxv.h> header file which loads the
535 system <elf.h> header file, which conflicts with the
536 "include/elf/mips.h" header file. */
537 /* Fall through. */
538 default:
539 break;
540 }
541
542 if (replacement)
543 {
544 char * filename2 = xmalloc (flen + strlen (replacement));
545
546 if (end)
547 {
548 sprintf (filename2, "%.*s%s/%s",
549 (int)(var - filename), filename,
550 replacement, end + 1);
551 offset = (var - filename) + 1 + strlen (replacement);
552 }
553 else
554 {
555 sprintf (filename2, "%.*s%s",
556 (int)(var - filename), filename,
557 replacement);
558 offset = var - filename + strlen (replacement);
559 }
560
561 free (filename);
562 filename = filename2;
563 /* There is no need to restore the path separator (when
564 end != NULL) as we have replaced the entire string. */
565 }
566 else
567 {
568 if (verbose)
569 /* We only issue an "unrecognised" message in verbose mode
570 as the $<foo> token might be a legitimate component of
571 a path name in the target's file system. */
572 info_msg (_("unrecognised or unsupported token "
573 "'%s' in search path\n"), var);
574 if (end)
575 /* Restore the path separator. */
576 * end = '/';
577
578 /* PR 20784: Make sure that we resume the scan *after*
579 the token that we could not replace. */
580 offset = (var + 1) - filename;
581 }
582
583 free (freeme);
584 }
585
586 needed.name = filename;
587
588 if (ldelf_try_needed (&needed, force, is_linux))
589 return TRUE;
590
591 free (filename);
592
593 if (*s == '\0')
594 break;
595 path = s + 1;
596 }
597
598 return FALSE;
599}
600
601/* Prefix the sysroot to absolute paths in PATH, a string containing
602 paths separated by config.rpath_separator. If running on a DOS
603 file system, paths containing a drive spec won't have the sysroot
604 prefix added, unless the sysroot also specifies the same drive. */
605
606static const char *
607ldelf_add_sysroot (const char *path)
608{
609 size_t len, extra;
610 const char *p;
611 char *ret, *q;
612 int dos_drive_sysroot = HAS_DRIVE_SPEC (ld_sysroot);
613
614 len = strlen (ld_sysroot);
615 for (extra = 0, p = path; ; )
616 {
617 int dos_drive = HAS_DRIVE_SPEC (p);
618
619 if (dos_drive)
620 p += 2;
621 if (IS_DIR_SEPARATOR (*p)
622 && (!dos_drive
623 || (dos_drive_sysroot
624 && ld_sysroot[0] == p[-2])))
625 {
626 if (dos_drive && dos_drive_sysroot)
627 extra += len - 2;
628 else
629 extra += len;
630 }
631 p = strchr (p, config.rpath_separator);
632 if (!p)
633 break;
634 ++p;
635 }
636
637 ret = xmalloc (strlen (path) + extra + 1);
638
639 for (q = ret, p = path; ; )
640 {
641 const char *end;
642 int dos_drive = HAS_DRIVE_SPEC (p);
643
644 if (dos_drive)
645 {
646 *q++ = *p++;
647 *q++ = *p++;
648 }
649 if (IS_DIR_SEPARATOR (*p)
650 && (!dos_drive
651 || (dos_drive_sysroot
652 && ld_sysroot[0] == p[-2])))
653 {
654 if (dos_drive && dos_drive_sysroot)
655 {
656 strcpy (q, ld_sysroot + 2);
657 q += len - 2;
658 }
659 else
660 {
661 strcpy (q, ld_sysroot);
662 q += len;
663 }
664 }
665 end = strchr (p, config.rpath_separator);
666 if (end)
667 {
668 size_t n = end - p + 1;
669 strncpy (q, p, n);
670 q += n;
671 p += n;
672 }
673 else
674 {
675 strcpy (q, p);
676 break;
677 }
678 }
679
680 return ret;
681}
682
683/* Read the system search path the FreeBSD way rather than the Linux way. */
684#ifdef HAVE_ELF_HINTS_H
685#include <elf-hints.h>
686#else
687#include "elf-hints-local.h"
688#endif
689
690static bfd_boolean
691ldelf_check_ld_elf_hints (const struct bfd_link_needed_list *l, int force,
692 int elfsize)
693{
694 static bfd_boolean initialized;
695 static const char *ld_elf_hints;
696 struct dt_needed needed;
697
698 if (!initialized)
699 {
700 FILE *f;
701 char *tmppath;
702
703 tmppath = concat (ld_sysroot, _PATH_ELF_HINTS, (const char *) NULL);
704 f = fopen (tmppath, FOPEN_RB);
705 free (tmppath);
706 if (f != NULL)
707 {
708 struct elfhints_hdr hdr;
709
710 if (fread (&hdr, 1, sizeof (hdr), f) == sizeof (hdr)
711 && hdr.magic == ELFHINTS_MAGIC
712 && hdr.version == 1)
713 {
714 if (fseek (f, hdr.strtab + hdr.dirlist, SEEK_SET) != -1)
715 {
716 char *b;
717
718 b = xmalloc (hdr.dirlistlen + 1);
719 if (fread (b, 1, hdr.dirlistlen + 1, f) ==
720 hdr.dirlistlen + 1)
721 ld_elf_hints = ldelf_add_sysroot (b);
722
723 free (b);
724 }
725 }
726 fclose (f);
727 }
728
729 initialized = TRUE;
730 }
731
732 if (ld_elf_hints == NULL)
733 return FALSE;
734
735 needed.by = l->by;
736 needed.name = l->name;
737 return ldelf_search_needed (ld_elf_hints, &needed, force, FALSE, elfsize);
738}
739
740/* For a native linker, check the file /etc/ld.so.conf for directories
741 in which we may find shared libraries. /etc/ld.so.conf is really
742 only meaningful on Linux. */
743
744struct ldelf_ld_so_conf
745{
746 char *path;
747 size_t len, alloc;
748};
749
750static bfd_boolean
751ldelf_parse_ld_so_conf (struct ldelf_ld_so_conf *, const char *);
752
753static void
754ldelf_parse_ld_so_conf_include (struct ldelf_ld_so_conf *info,
755 const char *filename,
756 const char *pattern)
757{
758 char *newp = NULL;
759#ifdef HAVE_GLOB
760 glob_t gl;
761#endif
762
763 if (pattern[0] != '/')
764 {
765 char *p = strrchr (filename, '/');
766 size_t patlen = strlen (pattern) + 1;
767
768 newp = xmalloc (p - filename + 1 + patlen);
769 memcpy (newp, filename, p - filename + 1);
770 memcpy (newp + (p - filename + 1), pattern, patlen);
771 pattern = newp;
772 }
773
774#ifdef HAVE_GLOB
775 if (glob (pattern, 0, NULL, &gl) == 0)
776 {
777 size_t i;
778
779 for (i = 0; i < gl.gl_pathc; ++i)
780 ldelf_parse_ld_so_conf (info, gl.gl_pathv[i]);
781 globfree (&gl);
782 }
783#else
784 /* If we do not have glob, treat the pattern as a literal filename. */
785 ldelf_parse_ld_so_conf (info, pattern);
786#endif
787
5e2ab612 788 free (newp);
d871d478
AM
789}
790
791static bfd_boolean
792ldelf_parse_ld_so_conf (struct ldelf_ld_so_conf *info, const char *filename)
793{
794 FILE *f = fopen (filename, FOPEN_RT);
795 char *line;
796 size_t linelen;
797
798 if (f == NULL)
799 return FALSE;
800
801 linelen = 256;
802 line = xmalloc (linelen);
803 do
804 {
805 char *p = line, *q;
806
807 /* Normally this would use getline(3), but we need to be portable. */
808 while ((q = fgets (p, linelen - (p - line), f)) != NULL
809 && strlen (q) == linelen - (p - line) - 1
810 && line[linelen - 2] != '\n')
811 {
812 line = xrealloc (line, 2 * linelen);
813 p = line + linelen - 1;
814 linelen += linelen;
815 }
816
817 if (q == NULL && p == line)
818 break;
819
820 p = strchr (line, '\n');
821 if (p)
822 *p = '\0';
823
824 /* Because the file format does not know any form of quoting we
825 can search forward for the next '#' character and if found
826 make it terminating the line. */
827 p = strchr (line, '#');
828 if (p)
829 *p = '\0';
830
831 /* Remove leading whitespace. NUL is no whitespace character. */
832 p = line;
833 while (*p == ' ' || *p == '\f' || *p == '\r' || *p == '\t' || *p == '\v')
834 ++p;
835
836 /* If the line is blank it is ignored. */
837 if (p[0] == '\0')
838 continue;
839
840 if (CONST_STRNEQ (p, "include") && (p[7] == ' ' || p[7] == '\t'))
841 {
842 char *dir, c;
843 p += 8;
844 do
845 {
846 while (*p == ' ' || *p == '\t')
847 ++p;
848
849 if (*p == '\0')
850 break;
851
852 dir = p;
853
854 while (*p != ' ' && *p != '\t' && *p)
855 ++p;
856
857 c = *p;
858 *p++ = '\0';
859 if (dir[0] != '\0')
860 ldelf_parse_ld_so_conf_include (info, filename, dir);
861 }
862 while (c != '\0');
863 }
864 else
865 {
866 char *dir = p;
867 while (*p && *p != '=' && *p != ' ' && *p != '\t' && *p != '\f'
868 && *p != '\r' && *p != '\v')
869 ++p;
870
871 while (p != dir && p[-1] == '/')
872 --p;
873 if (info->path == NULL)
874 {
875 info->alloc = p - dir + 1 + 256;
876 info->path = xmalloc (info->alloc);
877 info->len = 0;
878 }
879 else
880 {
881 if (info->len + 1 + (p - dir) >= info->alloc)
882 {
883 info->alloc += p - dir + 256;
884 info->path = xrealloc (info->path, info->alloc);
885 }
886 info->path[info->len++] = config.rpath_separator;
887 }
888 memcpy (info->path + info->len, dir, p - dir);
889 info->len += p - dir;
890 info->path[info->len] = '\0';
891 }
892 }
893 while (! feof (f));
894 free (line);
895 fclose (f);
896 return TRUE;
897}
898
899static bfd_boolean
900ldelf_check_ld_so_conf (const struct bfd_link_needed_list *l, int force,
ef8f08ca 901 int elfsize, const char *prefix)
d871d478
AM
902{
903 static bfd_boolean initialized;
904 static const char *ld_so_conf;
905 struct dt_needed needed;
906
907 if (! initialized)
908 {
909 char *tmppath;
910 struct ldelf_ld_so_conf info;
911
912 info.path = NULL;
913 info.len = info.alloc = 0;
ef8f08ca 914 tmppath = concat (ld_sysroot, prefix, "/etc/ld.so.conf",
d871d478
AM
915 (const char *) NULL);
916 if (!ldelf_parse_ld_so_conf (&info, tmppath))
917 {
918 free (tmppath);
919 tmppath = concat (ld_sysroot, "/etc/ld.so.conf",
920 (const char *) NULL);
921 ldelf_parse_ld_so_conf (&info, tmppath);
922 }
923 free (tmppath);
924
925 if (info.path)
926 {
927 ld_so_conf = ldelf_add_sysroot (info.path);
928 free (info.path);
929 }
930 initialized = TRUE;
931 }
932
933 if (ld_so_conf == NULL)
934 return FALSE;
935
936
937 needed.by = l->by;
938 needed.name = l->name;
939 return ldelf_search_needed (ld_so_conf, &needed, force, TRUE, elfsize);
940}
941
942/* See if an input file matches a DT_NEEDED entry by name. */
943
944static void
945ldelf_check_needed (lang_input_statement_type *s)
946{
947 const char *soname;
948
949 /* Stop looking if we've found a loaded lib. */
950 if (global_found != NULL
951 && (bfd_elf_get_dyn_lib_class (global_found->the_bfd)
952 & DYN_AS_NEEDED) == 0)
953 return;
954
955 if (s->filename == NULL || s->the_bfd == NULL)
956 return;
957
958 /* Don't look for a second non-loaded as-needed lib. */
959 if (global_found != NULL
960 && (bfd_elf_get_dyn_lib_class (s->the_bfd) & DYN_AS_NEEDED) != 0)
961 return;
962
963 if (filename_cmp (s->filename, global_needed->name) == 0)
964 {
965 global_found = s;
966 return;
967 }
968
969 if (s->flags.search_dirs)
970 {
971 const char *f = strrchr (s->filename, '/');
972 if (f != NULL
973 && filename_cmp (f + 1, global_needed->name) == 0)
974 {
975 global_found = s;
976 return;
977 }
978 }
979
980 soname = bfd_elf_get_dt_soname (s->the_bfd);
981 if (soname != NULL
982 && filename_cmp (soname, global_needed->name) == 0)
983 {
984 global_found = s;
985 return;
986 }
987}
988
989/* This is called after all the input files have been opened. */
990
991void
992ldelf_after_open (int use_libpath, int native, int is_linux, int is_freebsd,
ef8f08ca 993 int elfsize, const char *prefix)
d871d478
AM
994{
995 struct bfd_link_needed_list *needed, *l;
996 struct elf_link_hash_table *htab;
997 asection *s;
998 bfd *abfd;
e310298c 999 bfd **save_input_bfd_tail;
d871d478
AM
1000
1001 after_open_default ();
1002
1003 htab = elf_hash_table (&link_info);
1004 if (!is_elf_hash_table (htab))
1005 return;
1006
1007 if (command_line.out_implib_filename)
1008 {
1009 unlink_if_ordinary (command_line.out_implib_filename);
1010 link_info.out_implib_bfd
1011 = bfd_openw (command_line.out_implib_filename,
1012 bfd_get_target (link_info.output_bfd));
1013
1014 if (link_info.out_implib_bfd == NULL)
1015 {
1016 einfo (_("%F%P: %s: can't open for writing: %E\n"),
1017 command_line.out_implib_filename);
1018 }
1019 }
1020
1021 if (ldelf_emit_note_gnu_build_id != NULL)
1022 {
1023 /* Find an ELF input. */
1024 for (abfd = link_info.input_bfds;
1025 abfd != (bfd *) NULL; abfd = abfd->link.next)
1026 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
1027 && bfd_count_sections (abfd) != 0
00f93c44 1028 && !bfd_input_just_syms (abfd))
d871d478
AM
1029 break;
1030
1031 /* PR 10555: If there are no ELF input files do not try to
1032 create a .note.gnu-build-id section. */
1033 if (abfd == NULL
1034 || !ldelf_setup_build_id (abfd))
1035 {
1036 free ((char *) ldelf_emit_note_gnu_build_id);
1037 ldelf_emit_note_gnu_build_id = NULL;
1038 }
1039 }
1040
1041 get_elf_backend_data (link_info.output_bfd)->setup_gnu_properties (&link_info);
1042
a87e1817
NC
1043 /* Do not allow executable files to be used as inputs to the link. */
1044 for (abfd = link_info.input_bfds; abfd; abfd = abfd->link.next)
1045 {
0403e9cc
L
1046 if (abfd->xvec->flavour == bfd_target_elf_flavour
1047 && !bfd_input_just_syms (abfd)
97c79e21 1048 && elf_tdata (abfd) != NULL
a87e1817
NC
1049 && elf_tdata (abfd)->elf_header != NULL
1050 /* FIXME: Maybe check for other non-supportable types as well ? */
1051 && elf_tdata (abfd)->elf_header->e_type == ET_EXEC)
1052 einfo (_("%F%P: cannot use executable file '%pB' as input to a link\n"),
1053 abfd);
1054 }
1055
d871d478
AM
1056 if (bfd_link_relocatable (&link_info))
1057 {
1058 if (link_info.execstack == !link_info.noexecstack)
1059 {
1060 /* PR ld/16744: If "-z [no]execstack" has been specified on the
1061 command line and we are perfoming a relocatable link then no
1062 PT_GNU_STACK segment will be created and so the
1063 linkinfo.[no]execstack values set in _handle_option() will have no
1064 effect. Instead we create a .note.GNU-stack section in much the
1065 same way as the assembler does with its --[no]execstack option. */
1066 flagword flags = SEC_READONLY | (link_info.execstack ? SEC_CODE : 0);
1067 (void) bfd_make_section_with_flags (link_info.input_bfds,
1068 ".note.GNU-stack", flags);
1069 }
1070 return;
1071 }
f37b21b4 1072
d871d478
AM
1073 if (!link_info.traditional_format)
1074 {
1075 bfd *elfbfd = NULL;
1076 bfd_boolean warn_eh_frame = FALSE;
1077 int seen_type = 0;
1078
1079 for (abfd = link_info.input_bfds; abfd; abfd = abfd->link.next)
1080 {
1081 int type = 0;
1082
00f93c44 1083 if (bfd_input_just_syms (abfd))
d871d478
AM
1084 continue;
1085
1086 for (s = abfd->sections; s && type < COMPACT_EH_HDR; s = s->next)
1087 {
fd361982 1088 const char *name = bfd_section_name (s);
d871d478
AM
1089
1090 if (bfd_is_abs_section (s->output_section))
1091 continue;
1092 if (CONST_STRNEQ (name, ".eh_frame_entry"))
1093 type = COMPACT_EH_HDR;
1094 else if (strcmp (name, ".eh_frame") == 0 && s->size > 8)
1095 type = DWARF2_EH_HDR;
1096 }
1097
1098 if (type != 0)
1099 {
1100 if (seen_type == 0)
1101 {
1102 seen_type = type;
1103 }
1104 else if (seen_type != type)
1105 {
1106 einfo (_("%F%P: compact frame descriptions incompatible with"
1107 " DWARF2 .eh_frame from %pB\n"),
1108 type == DWARF2_EH_HDR ? abfd : elfbfd);
1109 break;
1110 }
1111
1112 if (!elfbfd
1113 && (type == COMPACT_EH_HDR
1114 || link_info.eh_frame_hdr_type != 0))
1115 {
1116 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
1117 elfbfd = abfd;
1118
1119 warn_eh_frame = TRUE;
1120 }
1121 }
1122
1123 if (seen_type == COMPACT_EH_HDR)
1124 link_info.eh_frame_hdr_type = COMPACT_EH_HDR;
1125 }
1126 if (elfbfd)
1127 {
1128 const struct elf_backend_data *bed;
1129
1130 bed = get_elf_backend_data (elfbfd);
1131 s = bfd_make_section_with_flags (elfbfd, ".eh_frame_hdr",
1132 bed->dynamic_sec_flags
1133 | SEC_READONLY);
1134 if (s != NULL
fd361982 1135 && bfd_set_section_alignment (s, 2))
d871d478
AM
1136 {
1137 htab->eh_info.hdr_sec = s;
1138 warn_eh_frame = FALSE;
1139 }
1140 }
1141 if (warn_eh_frame)
1142 einfo (_("%P: warning: cannot create .eh_frame_hdr section,"
1143 " --eh-frame-hdr ignored\n"));
1144 }
1145
1146 /* Get the list of files which appear in DT_NEEDED entries in
1147 dynamic objects included in the link (often there will be none).
1148 For each such file, we want to track down the corresponding
1149 library, and include the symbol table in the link. This is what
1150 the runtime dynamic linker will do. Tracking the files down here
1151 permits one dynamic object to include another without requiring
1152 special action by the person doing the link. Note that the
1153 needed list can actually grow while we are stepping through this
1154 loop. */
e310298c 1155 save_input_bfd_tail = link_info.input_bfds_tail;
d871d478
AM
1156 needed = bfd_elf_get_needed_list (link_info.output_bfd, &link_info);
1157 for (l = needed; l != NULL; l = l->next)
1158 {
1159 struct bfd_link_needed_list *ll;
1160 struct dt_needed n, nn;
1161 int force;
1162
1163 /* If the lib that needs this one was --as-needed and wasn't
1164 found to be needed, then this lib isn't needed either. */
1165 if (l->by != NULL
1166 && (bfd_elf_get_dyn_lib_class (l->by) & DYN_AS_NEEDED) != 0)
1167 continue;
1168
1169 /* Skip the lib if --no-copy-dt-needed-entries and
1170 --allow-shlib-undefined is in effect. */
1171 if (l->by != NULL
1172 && link_info.unresolved_syms_in_shared_libs == RM_IGNORE
1173 && (bfd_elf_get_dyn_lib_class (l->by) & DYN_NO_ADD_NEEDED) != 0)
1174 continue;
1175
1176 /* If we've already seen this file, skip it. */
1177 for (ll = needed; ll != l; ll = ll->next)
1178 if ((ll->by == NULL
1179 || (bfd_elf_get_dyn_lib_class (ll->by) & DYN_AS_NEEDED) == 0)
1180 && strcmp (ll->name, l->name) == 0)
1181 break;
1182 if (ll != l)
1183 continue;
1184
1185 /* See if this file was included in the link explicitly. */
1186 global_needed = l;
1187 global_found = NULL;
1188 lang_for_each_input_file (ldelf_check_needed);
1189 if (global_found != NULL
1190 && (bfd_elf_get_dyn_lib_class (global_found->the_bfd)
1191 & DYN_AS_NEEDED) == 0)
1192 continue;
1193
1194 n.by = l->by;
1195 n.name = l->name;
1196 nn.by = l->by;
1197 if (verbose)
1198 info_msg (_("%s needed by %pB\n"), l->name, l->by);
1199
1200 /* As-needed libs specified on the command line (or linker script)
1201 take priority over libs found in search dirs. */
1202 if (global_found != NULL)
1203 {
1204 nn.name = global_found->filename;
1205 if (ldelf_try_needed (&nn, TRUE, is_linux))
1206 continue;
1207 }
1208
1209 /* We need to find this file and include the symbol table. We
1210 want to search for the file in the same way that the dynamic
1211 linker will search. That means that we want to use
1212 rpath_link, rpath, then the environment variable
1213 LD_LIBRARY_PATH (native only), then the DT_RPATH/DT_RUNPATH
1214 entries (native only), then the linker script LIB_SEARCH_DIRS.
1215 We do not search using the -L arguments.
1216
1217 We search twice. The first time, we skip objects which may
1218 introduce version mismatches. The second time, we force
1219 their use. See ldelf_vercheck comment. */
1220 for (force = 0; force < 2; force++)
1221 {
1222 size_t len;
1223 search_dirs_type *search;
1224 const char *path;
1225 struct bfd_link_needed_list *rp;
1226 int found;
1227
1228 if (ldelf_search_needed (command_line.rpath_link, &n, force,
1229 is_linux, elfsize))
1230 break;
1231
1232 if (use_libpath)
1233 {
1234 path = command_line.rpath;
1235 if (path)
1236 {
1237 path = ldelf_add_sysroot (path);
1238 found = ldelf_search_needed (path, &n, force,
1239 is_linux, elfsize);
1240 free ((char *) path);
1241 if (found)
1242 break;
1243 }
1244 }
1245 if (native)
1246 {
1247 if (command_line.rpath_link == NULL
1248 && command_line.rpath == NULL)
1249 {
1250 path = (const char *) getenv ("LD_RUN_PATH");
1251 if (path
1252 && ldelf_search_needed (path, &n, force,
1253 is_linux, elfsize))
1254 break;
1255 }
1256 path = (const char *) getenv ("LD_LIBRARY_PATH");
1257 if (path
1258 && ldelf_search_needed (path, &n, force,
1259 is_linux, elfsize))
1260 break;
1261 }
1262 if (use_libpath)
1263 {
1264 found = 0;
1265 rp = bfd_elf_get_runpath_list (link_info.output_bfd, &link_info);
1266 for (; !found && rp != NULL; rp = rp->next)
1267 {
1268 path = ldelf_add_sysroot (rp->name);
1269 found = (rp->by == l->by
1270 && ldelf_search_needed (path, &n, force,
1271 is_linux, elfsize));
1272 free ((char *) path);
1273 }
1274 if (found)
1275 break;
1276
1277 if (is_freebsd
1278 && ldelf_check_ld_elf_hints (l, force, elfsize))
1279 break;
1280
1281 if (is_linux
ef8f08ca 1282 && ldelf_check_ld_so_conf (l, force, elfsize, prefix))
d871d478
AM
1283 break;
1284 }
1285
1286 len = strlen (l->name);
1287 for (search = search_head; search != NULL; search = search->next)
1288 {
1289 char *filename;
1290
1291 if (search->cmdline)
1292 continue;
1293 filename = (char *) xmalloc (strlen (search->name) + len + 2);
1294 sprintf (filename, "%s/%s", search->name, l->name);
1295 nn.name = filename;
1296 if (ldelf_try_needed (&nn, force, is_linux))
1297 break;
1298 free (filename);
1299 }
1300 if (search != NULL)
1301 break;
1302 }
1303
1304 if (force < 2)
1305 continue;
1306
1307 einfo (_("%P: warning: %s, needed by %pB, not found "
1308 "(try using -rpath or -rpath-link)\n"),
1309 l->name, l->by);
1310 }
1311
e310298c
AM
1312 for (abfd = link_info.input_bfds; abfd; abfd = abfd->link.next)
1313 if (bfd_get_format (abfd) == bfd_object
1314 && ((abfd->flags) & DYNAMIC) != 0
1315 && bfd_get_flavour (abfd) == bfd_target_elf_flavour
1316 && (elf_dyn_lib_class (abfd) & (DYN_AS_NEEDED | DYN_NO_NEEDED)) == 0
1317 && elf_dt_name (abfd) != NULL)
1318 {
1319 if (bfd_elf_add_dt_needed_tag (abfd, &link_info) < 0)
1320 einfo (_("%F%P: failed to add DT_NEEDED dynamic tag\n"));
1321 }
1322
1323 link_info.input_bfds_tail = save_input_bfd_tail;
1324 *save_input_bfd_tail = NULL;
1325
d871d478
AM
1326 if (link_info.eh_frame_hdr_type == COMPACT_EH_HDR)
1327 if (!bfd_elf_parse_eh_frame_entries (NULL, &link_info))
1328 einfo (_("%F%P: failed to parse EH frame entries\n"));
1329}
1330
1331static bfd_size_type
1332id_note_section_size (bfd *abfd ATTRIBUTE_UNUSED)
1333{
1334 const char *style = ldelf_emit_note_gnu_build_id;
1335 bfd_size_type size;
1336 bfd_size_type build_id_size;
1337
1338 size = offsetof (Elf_External_Note, name[sizeof "GNU"]);
1339 size = (size + 3) & -(bfd_size_type) 4;
1340
1341 build_id_size = compute_build_id_size (style);
1342 if (build_id_size)
1343 size += build_id_size;
1344 else
1345 size = 0;
1346
1347 return size;
1348}
1349
1350static bfd_boolean
1351write_build_id (bfd *abfd)
1352{
1353 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
1354 struct elf_obj_tdata *t = elf_tdata (abfd);
1355 const char *style;
1356 asection *asec;
1357 Elf_Internal_Shdr *i_shdr;
1358 unsigned char *contents, *id_bits;
1359 bfd_size_type size;
1360 file_ptr position;
1361 Elf_External_Note *e_note;
1362
1363 style = t->o->build_id.style;
1364 asec = t->o->build_id.sec;
1365 if (bfd_is_abs_section (asec->output_section))
1366 {
1367 einfo (_("%P: warning: .note.gnu.build-id section discarded,"
1368 " --build-id ignored\n"));
1369 return TRUE;
1370 }
1371 i_shdr = &elf_section_data (asec->output_section)->this_hdr;
1372
1373 if (i_shdr->contents == NULL)
1374 {
1375 if (asec->contents == NULL)
1376 asec->contents = (unsigned char *) xmalloc (asec->size);
1377 contents = asec->contents;
1378 }
1379 else
1380 contents = i_shdr->contents + asec->output_offset;
1381
1382 e_note = (Elf_External_Note *) contents;
1383 size = offsetof (Elf_External_Note, name[sizeof "GNU"]);
1384 size = (size + 3) & -(bfd_size_type) 4;
1385 id_bits = contents + size;
1386 size = asec->size - size;
1387
1388 bfd_h_put_32 (abfd, sizeof "GNU", &e_note->namesz);
1389 bfd_h_put_32 (abfd, size, &e_note->descsz);
1390 bfd_h_put_32 (abfd, NT_GNU_BUILD_ID, &e_note->type);
1391 memcpy (e_note->name, "GNU", sizeof "GNU");
1392
1393 generate_build_id (abfd, style, bed->s->checksum_contents, id_bits, size);
1394
1395 position = i_shdr->sh_offset + asec->output_offset;
1396 size = asec->size;
1397 return (bfd_seek (abfd, position, SEEK_SET) == 0
1398 && bfd_bwrite (contents, size, abfd) == size);
1399}
1400
1401/* Make .note.gnu.build-id section, and set up elf_tdata->build_id. */
1402
1403bfd_boolean
1404ldelf_setup_build_id (bfd *ibfd)
1405{
1406 asection *s;
1407 bfd_size_type size;
1408 flagword flags;
1409
1410 size = id_note_section_size (ibfd);
1411 if (size == 0)
1412 {
1413 einfo (_("%P: warning: unrecognized --build-id style ignored\n"));
1414 return FALSE;
1415 }
1416
1417 flags = (SEC_ALLOC | SEC_LOAD | SEC_IN_MEMORY
1418 | SEC_LINKER_CREATED | SEC_READONLY | SEC_DATA);
1419 s = bfd_make_section_with_flags (ibfd, ".note.gnu.build-id", flags);
fd361982 1420 if (s != NULL && bfd_set_section_alignment (s, 2))
d871d478
AM
1421 {
1422 struct elf_obj_tdata *t = elf_tdata (link_info.output_bfd);
1423 t->o->build_id.after_write_object_contents = &write_build_id;
1424 t->o->build_id.style = ldelf_emit_note_gnu_build_id;
1425 t->o->build_id.sec = s;
1426 elf_section_type (s) = SHT_NOTE;
1427 s->size = size;
1428 return TRUE;
1429 }
1430
1431 einfo (_("%P: warning: cannot create .note.gnu.build-id section,"
1432 " --build-id ignored\n"));
1433 return FALSE;
1434}
1435
1436/* Look through an expression for an assignment statement. */
1437
1438static void
1439ldelf_find_exp_assignment (etree_type *exp)
1440{
1441 bfd_boolean provide = FALSE;
1442
1443 switch (exp->type.node_class)
1444 {
1445 case etree_provide:
1446 case etree_provided:
1447 provide = TRUE;
1448 /* Fallthru */
1449 case etree_assign:
1450 /* We call record_link_assignment even if the symbol is defined.
1451 This is because if it is defined by a dynamic object, we
1452 actually want to use the value defined by the linker script,
1453 not the value from the dynamic object (because we are setting
1454 symbols like etext). If the symbol is defined by a regular
1455 object, then, as it happens, calling record_link_assignment
1456 will do no harm. */
1457 if (strcmp (exp->assign.dst, ".") != 0)
1458 {
1459 if (!bfd_elf_record_link_assignment (link_info.output_bfd,
1460 &link_info,
1461 exp->assign.dst, provide,
1462 exp->assign.hidden))
1463 einfo (_("%F%P: failed to record assignment to %s: %E\n"),
1464 exp->assign.dst);
1465 }
1466 ldelf_find_exp_assignment (exp->assign.src);
1467 break;
1468
1469 case etree_binary:
1470 ldelf_find_exp_assignment (exp->binary.lhs);
1471 ldelf_find_exp_assignment (exp->binary.rhs);
1472 break;
1473
1474 case etree_trinary:
1475 ldelf_find_exp_assignment (exp->trinary.cond);
1476 ldelf_find_exp_assignment (exp->trinary.lhs);
1477 ldelf_find_exp_assignment (exp->trinary.rhs);
1478 break;
1479
1480 case etree_unary:
1481 ldelf_find_exp_assignment (exp->unary.child);
1482 break;
1483
1484 default:
1485 break;
1486 }
1487}
1488
1489/* This is called by the before_allocation routine via
1490 lang_for_each_statement. It locates any assignment statements, and
1491 tells the ELF backend about them, in case they are assignments to
1492 symbols which are referred to by dynamic objects. */
1493
1494static void
1495ldelf_find_statement_assignment (lang_statement_union_type *s)
1496{
1497 if (s->header.type == lang_assignment_statement_enum)
1498 ldelf_find_exp_assignment (s->assignment_statement.exp);
1499}
1500
1501/* Used by before_allocation and handle_option. */
1502
1503void
1504ldelf_append_to_separated_string (char **to, char *op_arg)
1505{
1506 if (*to == NULL)
1507 *to = xstrdup (op_arg);
1508 else
1509 {
1510 size_t to_len = strlen (*to);
1511 size_t op_arg_len = strlen (op_arg);
1512 char *buf;
1513 char *cp = *to;
1514
1515 /* First see whether OPTARG is already in the path. */
1516 do
1517 {
1518 if (strncmp (op_arg, cp, op_arg_len) == 0
1519 && (cp[op_arg_len] == 0
1520 || cp[op_arg_len] == config.rpath_separator))
1521 /* We found it. */
1522 break;
1523
1524 /* Not yet found. */
1525 cp = strchr (cp, config.rpath_separator);
1526 if (cp != NULL)
1527 ++cp;
1528 }
1529 while (cp != NULL);
1530
1531 if (cp == NULL)
1532 {
1533 buf = xmalloc (to_len + op_arg_len + 2);
1534 sprintf (buf, "%s%c%s", *to,
1535 config.rpath_separator, op_arg);
1536 free (*to);
1537 *to = buf;
1538 }
1539 }
1540}
1541
1542/* This is called after the sections have been attached to output
1543 sections, but before any sizes or addresses have been set. */
1544
1545void
1546ldelf_before_allocation (char *audit, char *depaudit,
1547 const char *default_interpreter_name)
1548{
1549 const char *rpath;
1550 asection *sinterp;
1551 bfd *abfd;
1552 struct bfd_link_hash_entry *ehdr_start = NULL;
1553 unsigned char ehdr_start_save_type = 0;
1554 char ehdr_start_save_u[sizeof ehdr_start->u
1555 - sizeof ehdr_start->u.def.next] = "";
1556
1557 if (is_elf_hash_table (link_info.hash))
1558 {
1559 _bfd_elf_tls_setup (link_info.output_bfd, &link_info);
1560
1561 /* Make __ehdr_start hidden if it has been referenced, to
1562 prevent the symbol from being dynamic. */
1563 if (!bfd_link_relocatable (&link_info))
1564 {
1565 struct elf_link_hash_table *htab = elf_hash_table (&link_info);
1566 struct elf_link_hash_entry *h
1567 = elf_link_hash_lookup (htab, "__ehdr_start", FALSE, FALSE, TRUE);
1568
1569 /* Only adjust the export class if the symbol was referenced
1570 and not defined, otherwise leave it alone. */
1571 if (h != NULL
1572 && (h->root.type == bfd_link_hash_new
1573 || h->root.type == bfd_link_hash_undefined
1574 || h->root.type == bfd_link_hash_undefweak
1575 || h->root.type == bfd_link_hash_common))
1576 {
1577 const struct elf_backend_data *bed;
1578 bed = get_elf_backend_data (link_info.output_bfd);
1579 (*bed->elf_backend_hide_symbol) (&link_info, h, TRUE);
1580 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
1581 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
1582 /* Don't leave the symbol undefined. Undefined hidden
1583 symbols typically won't have dynamic relocations, but
1584 we most likely will need dynamic relocations for
1585 __ehdr_start if we are building a PIE or shared
1586 library. */
1587 ehdr_start = &h->root;
1588 ehdr_start_save_type = ehdr_start->type;
1589 memcpy (ehdr_start_save_u,
1590 (char *) &ehdr_start->u + sizeof ehdr_start->u.def.next,
1591 sizeof ehdr_start_save_u);
1592 ehdr_start->type = bfd_link_hash_defined;
1593 ehdr_start->u.def.section = bfd_abs_section_ptr;
1594 ehdr_start->u.def.value = 0;
1595 }
1596 }
1597
1598 /* If we are going to make any variable assignments, we need to
1599 let the ELF backend know about them in case the variables are
1600 referred to by dynamic objects. */
1601 lang_for_each_statement (ldelf_find_statement_assignment);
1602 }
1603
1604 /* Let the ELF backend work out the sizes of any sections required
1605 by dynamic linking. */
1606 rpath = command_line.rpath;
1607 if (rpath == NULL)
1608 rpath = (const char *) getenv ("LD_RUN_PATH");
1609
1610 for (abfd = link_info.input_bfds; abfd; abfd = abfd->link.next)
1611 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
1612 {
1613 const char *audit_libs = elf_dt_audit (abfd);
1614
1615 /* If the input bfd contains an audit entry, we need to add it as
1616 a dep audit entry. */
1617 if (audit_libs && *audit_libs != '\0')
1618 {
1619 char *cp = xstrdup (audit_libs);
1620 do
1621 {
1622 int more = 0;
1623 char *cp2 = strchr (cp, config.rpath_separator);
1624
1625 if (cp2)
1626 {
1627 *cp2 = '\0';
1628 more = 1;
1629 }
1630
1631 if (cp != NULL && *cp != '\0')
1632 ldelf_append_to_separated_string (&depaudit, cp);
1633
1634 cp = more ? ++cp2 : NULL;
1635 }
1636 while (cp != NULL);
1637 }
1638 }
1639
1640 if (! (bfd_elf_size_dynamic_sections
1641 (link_info.output_bfd, command_line.soname, rpath,
1642 command_line.filter_shlib, audit, depaudit,
1643 (const char * const *) command_line.auxiliary_filters,
1644 &link_info, &sinterp)))
1645 einfo (_("%F%P: failed to set dynamic section sizes: %E\n"));
1646
1647 if (sinterp != NULL)
1648 {
1649 /* Let the user override the dynamic linker we are using. */
1650 if (command_line.interpreter != NULL)
1651 default_interpreter_name = command_line.interpreter;
1652 if (default_interpreter_name != NULL)
1653 {
1654 sinterp->contents = (bfd_byte *) default_interpreter_name;
1655 sinterp->size = strlen ((char *) sinterp->contents) + 1;
1656 }
1657 }
1658
1659 /* Look for any sections named .gnu.warning. As a GNU extensions,
1660 we treat such sections as containing warning messages. We print
1661 out the warning message, and then zero out the section size so
1662 that it does not get copied into the output file. */
1663
1664 {
1665 LANG_FOR_EACH_INPUT_STATEMENT (is)
1666 {
1667 asection *s;
1668 bfd_size_type sz;
1669 char *msg;
1670
1671 if (is->flags.just_syms)
1672 continue;
1673
1674 s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
1675 if (s == NULL)
1676 continue;
1677
1678 sz = s->size;
1679 msg = (char *) xmalloc ((size_t) (sz + 1));
1680 if (! bfd_get_section_contents (is->the_bfd, s, msg,
1681 (file_ptr) 0, sz))
1682 einfo (_("%F%P: %pB: can't read contents of section .gnu.warning: %E\n"),
1683 is->the_bfd);
1684 msg[sz] = '\0';
1685 (*link_info.callbacks->warning) (&link_info, msg,
1686 (const char *) NULL, is->the_bfd,
1687 (asection *) NULL, (bfd_vma) 0);
1688 free (msg);
1689
1690 /* Clobber the section size, so that we don't waste space
1691 copying the warning into the output file. If we've already
1692 sized the output section, adjust its size. The adjustment
1693 is on rawsize because targets that size sections early will
1694 have called lang_reset_memory_regions after sizing. */
1695 if (s->output_section != NULL
1696 && s->output_section->rawsize >= s->size)
1697 s->output_section->rawsize -= s->size;
1698
1699 s->size = 0;
1700
1701 /* Also set SEC_EXCLUDE, so that local symbols defined in the
1702 warning section don't get copied to the output. */
1703 s->flags |= SEC_EXCLUDE | SEC_KEEP;
1704 }
1705 }
1706
1707 before_allocation_default ();
1708
1709 if (!bfd_elf_size_dynsym_hash_dynstr (link_info.output_bfd, &link_info))
1710 einfo (_("%F%P: failed to set dynamic section sizes: %E\n"));
1711
1712 if (ehdr_start != NULL)
1713 {
1714 /* If we twiddled __ehdr_start to defined earlier, put it back
1715 as it was. */
1716 ehdr_start->type = ehdr_start_save_type;
1717 memcpy ((char *) &ehdr_start->u + sizeof ehdr_start->u.def.next,
1718 ehdr_start_save_u,
1719 sizeof ehdr_start_save_u);
1720 }
1721}
1722/* Try to open a dynamic archive. This is where we know that ELF
1723 dynamic libraries have an extension of .so (or .sl on oddball systems
1724 like hpux). */
1725
1726bfd_boolean
1727ldelf_open_dynamic_archive (const char *arch, search_dirs_type *search,
1728 lang_input_statement_type *entry)
1729{
1730 const char *filename;
1731 char *string;
1732 size_t len;
1733 bfd_boolean opened = FALSE;
1734
1735 if (! entry->flags.maybe_archive)
1736 return FALSE;
1737
1738 filename = entry->filename;
1739 len = strlen (search->name) + strlen (filename);
1740 if (entry->flags.full_name_provided)
1741 {
1742 len += sizeof "/";
1743 string = (char *) xmalloc (len);
1744 sprintf (string, "%s/%s", search->name, filename);
1745 }
1746 else
1747 {
1748 size_t xlen = 0;
1749
1750 len += strlen (arch) + sizeof "/lib.so";
1751#ifdef EXTRA_SHLIB_EXTENSION
1752 xlen = (strlen (EXTRA_SHLIB_EXTENSION) > 3
1753 ? strlen (EXTRA_SHLIB_EXTENSION) - 3
1754 : 0);
1755#endif
1756 string = (char *) xmalloc (len + xlen);
1757 sprintf (string, "%s/lib%s%s.so", search->name, filename, arch);
1758#ifdef EXTRA_SHLIB_EXTENSION
1759 /* Try the .so extension first. If that fails build a new filename
1760 using EXTRA_SHLIB_EXTENSION. */
1761 opened = ldfile_try_open_bfd (string, entry);
1762 if (!opened)
1763 strcpy (string + len - 4, EXTRA_SHLIB_EXTENSION);
1764#endif
1765 }
1766
1767 if (!opened && !ldfile_try_open_bfd (string, entry))
1768 {
1769 free (string);
1770 return FALSE;
1771 }
1772
1773 entry->filename = string;
1774
1775 /* We have found a dynamic object to include in the link. The ELF
1776 backend linker will create a DT_NEEDED entry in the .dynamic
1777 section naming this file. If this file includes a DT_SONAME
1778 entry, it will be used. Otherwise, the ELF linker will just use
1779 the name of the file. For an archive found by searching, like
1780 this one, the DT_NEEDED entry should consist of just the name of
1781 the file, without the path information used to find it. Note
1782 that we only need to do this if we have a dynamic object; an
1783 archive will never be referenced by a DT_NEEDED entry.
1784
1785 FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
1786 very pretty. I haven't been able to think of anything that is
1787 pretty, though. */
1788 if (bfd_check_format (entry->the_bfd, bfd_object)
1789 && (entry->the_bfd->flags & DYNAMIC) != 0)
1790 {
1791 ASSERT (entry->flags.maybe_archive && entry->flags.search_dirs);
1792
1793 /* Rather than duplicating the logic above. Just use the
1794 filename we recorded earlier. */
1795
1796 if (!entry->flags.full_name_provided)
1797 filename = lbasename (entry->filename);
1798 bfd_elf_set_dt_needed_name (entry->the_bfd, filename);
1799 }
1800
1801 return TRUE;
1802}
1803
1804/* A variant of lang_output_section_find used by place_orphan. */
1805
1806static lang_output_section_statement_type *
1807output_rel_find (int isdyn, int rela)
1808{
1809 lang_output_section_statement_type *lookup;
1810 lang_output_section_statement_type *last = NULL;
1811 lang_output_section_statement_type *last_alloc = NULL;
1812 lang_output_section_statement_type *last_ro_alloc = NULL;
1813 lang_output_section_statement_type *last_rel = NULL;
1814 lang_output_section_statement_type *last_rel_alloc = NULL;
1815
8ce18f9c 1816 for (lookup = (void *) lang_os_list.head;
d871d478
AM
1817 lookup != NULL;
1818 lookup = lookup->next)
1819 {
1820 if (lookup->constraint >= 0
1821 && CONST_STRNEQ (lookup->name, ".rel"))
1822 {
1823 int lookrela = lookup->name[4] == 'a';
1824
1825 /* .rel.dyn must come before all other reloc sections, to suit
1826 GNU ld.so. */
1827 if (isdyn)
1828 break;
1829
1830 /* Don't place after .rel.plt as doing so results in wrong
1831 dynamic tags. */
1832 if (strcmp (".plt", lookup->name + 4 + lookrela) == 0)
1833 break;
1834
1835 if (rela == lookrela || last_rel == NULL)
1836 last_rel = lookup;
1837 if ((rela == lookrela || last_rel_alloc == NULL)
1838 && lookup->bfd_section != NULL
1839 && (lookup->bfd_section->flags & SEC_ALLOC) != 0)
1840 last_rel_alloc = lookup;
1841 }
1842
1843 last = lookup;
1844 if (lookup->bfd_section != NULL
1845 && (lookup->bfd_section->flags & SEC_ALLOC) != 0)
1846 {
1847 last_alloc = lookup;
1848 if ((lookup->bfd_section->flags & SEC_READONLY) != 0)
1849 last_ro_alloc = lookup;
1850 }
1851 }
1852
1853 if (last_rel_alloc)
1854 return last_rel_alloc;
1855
1856 if (last_rel)
1857 return last_rel;
1858
1859 if (last_ro_alloc)
1860 return last_ro_alloc;
1861
1862 if (last_alloc)
1863 return last_alloc;
1864
1865 return last;
1866}
1867
1868/* Return whether IN is suitable to be part of OUT. */
1869
1870static bfd_boolean
1871elf_orphan_compatible (asection *in, asection *out)
1872{
1873 /* Non-zero sh_info implies a section with SHF_INFO_LINK with
1874 unknown semantics for the generic linker, or a SHT_REL/SHT_RELA
1875 section where sh_info specifies a symbol table. (We won't see
1876 SHT_GROUP, SHT_SYMTAB or SHT_DYNSYM sections here.) We clearly
1877 can't merge SHT_REL/SHT_RELA using differing symbol tables, and
1878 shouldn't merge sections with differing unknown semantics. */
1879 if (elf_section_data (out)->this_hdr.sh_info
1880 != elf_section_data (in)->this_hdr.sh_info)
1881 return FALSE;
1db6f990
AM
1882 /* We can't merge with a member of an output section group or merge
1883 two sections with differing SHF_EXCLUDE or other processor and OS
1884 specific flags when doing a relocatable link. */
d871d478
AM
1885 if (bfd_link_relocatable (&link_info)
1886 && (elf_next_in_group (out) != NULL
1887 || ((elf_section_flags (out) ^ elf_section_flags (in))
1db6f990 1888 & (SHF_MASKPROC | SHF_MASKOS)) != 0))
d871d478
AM
1889 return FALSE;
1890 return _bfd_elf_match_sections_by_type (link_info.output_bfd, out,
1891 in->owner, in);
1892}
1893
1894/* Place an orphan section. We use this to put random SHF_ALLOC
1895 sections in the right segment. */
1896
1897lang_output_section_statement_type *
1898ldelf_place_orphan (asection *s, const char *secname, int constraint)
1899{
1900 static struct orphan_save hold[] =
1901 {
1902 { ".text",
1903 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE,
1904 0, 0, 0, 0 },
1905 { ".rodata",
1906 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA,
1907 0, 0, 0, 0 },
1908 { ".tdata",
1909 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_THREAD_LOCAL,
1910 0, 0, 0, 0 },
1911 { ".data",
1912 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA,
1913 0, 0, 0, 0 },
1914 { ".bss",
1915 SEC_ALLOC,
1916 0, 0, 0, 0 },
1917 { 0,
1918 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA,
1919 0, 0, 0, 0 },
1920 { ".interp",
1921 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA,
1922 0, 0, 0, 0 },
1923 { ".sdata",
1924 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_SMALL_DATA,
1925 0, 0, 0, 0 },
1926 { ".comment",
1927 SEC_HAS_CONTENTS,
1928 0, 0, 0, 0 },
1929 };
1930 enum orphan_save_index
1931 {
1932 orphan_text = 0,
1933 orphan_rodata,
1934 orphan_tdata,
1935 orphan_data,
1936 orphan_bss,
1937 orphan_rel,
1938 orphan_interp,
1939 orphan_sdata,
1940 orphan_nonalloc
1941 };
1942 static int orphan_init_done = 0;
1943 struct orphan_save *place;
1944 lang_output_section_statement_type *after;
1945 lang_output_section_statement_type *os;
1946 lang_output_section_statement_type *match_by_name = NULL;
1947 int isdyn = 0;
1948 int elfinput = s->owner->xvec->flavour == bfd_target_elf_flavour;
1949 int elfoutput = link_info.output_bfd->xvec->flavour == bfd_target_elf_flavour;
1950 unsigned int sh_type = elfinput ? elf_section_type (s) : SHT_NULL;
1951 flagword flags;
1952 asection *nexts;
1953
1954 if (!bfd_link_relocatable (&link_info)
1955 && link_info.combreloc
1956 && (s->flags & SEC_ALLOC))
1957 {
1958 if (elfinput)
1959 switch (sh_type)
1960 {
1961 case SHT_RELA:
1962 secname = ".rela.dyn";
1963 isdyn = 1;
1964 break;
1965 case SHT_REL:
1966 secname = ".rel.dyn";
1967 isdyn = 1;
1968 break;
1969 default:
1970 break;
1971 }
1972 else if (CONST_STRNEQ (secname, ".rel"))
1973 {
1974 secname = secname[4] == 'a' ? ".rela.dyn" : ".rel.dyn";
1975 isdyn = 1;
1976 }
1977 }
1978
1979 if (!bfd_link_relocatable (&link_info)
1980 && elfinput
1981 && elfoutput
1982 && (s->flags & SEC_ALLOC) != 0
1983 && (elf_tdata (s->owner)->has_gnu_osabi & elf_gnu_osabi_mbind) != 0
1984 && (elf_section_flags (s) & SHF_GNU_MBIND) != 0)
1985 {
1986 /* Find the output mbind section with the same type, attributes
1987 and sh_info field. */
8ce18f9c 1988 for (os = (void *) lang_os_list.head;
d871d478
AM
1989 os != NULL;
1990 os = os->next)
1991 if (os->bfd_section != NULL
1992 && !bfd_is_abs_section (os->bfd_section)
1993 && (elf_section_flags (os->bfd_section) & SHF_GNU_MBIND) != 0
1994 && ((s->flags & (SEC_ALLOC
1995 | SEC_LOAD
1996 | SEC_HAS_CONTENTS
1997 | SEC_READONLY
1998 | SEC_CODE))
1999 == (os->bfd_section->flags & (SEC_ALLOC
2000 | SEC_LOAD
2001 | SEC_HAS_CONTENTS
2002 | SEC_READONLY
2003 | SEC_CODE)))
2004 && (elf_section_data (os->bfd_section)->this_hdr.sh_info
2005 == elf_section_data (s)->this_hdr.sh_info))
2006 {
2007 lang_add_section (&os->children, s, NULL, os);
2008 return os;
2009 }
2010
2011 /* Create the output mbind section with the ".mbind." prefix
2012 in section name. */
2013 if ((s->flags & (SEC_LOAD | SEC_HAS_CONTENTS)) == 0)
2014 secname = ".mbind.bss";
2015 else if ((s->flags & SEC_READONLY) == 0)
2016 secname = ".mbind.data";
2017 else if ((s->flags & SEC_CODE) == 0)
2018 secname = ".mbind.rodata";
2019 else
2020 secname = ".mbind.text";
2021 elf_tdata (link_info.output_bfd)->has_gnu_osabi |= elf_gnu_osabi_mbind;
2022 }
2023
2024 /* Look through the script to see where to place this section. The
2025 script includes entries added by previous lang_insert_orphan
2026 calls, so this loop puts multiple compatible orphans of the same
2027 name into a single output section. */
2028 if (constraint == 0)
2029 for (os = lang_output_section_find (secname);
2030 os != NULL;
2031 os = next_matching_output_section_statement (os, 0))
2032 {
2033 /* If we don't match an existing output section, tell
2034 lang_insert_orphan to create a new output section. */
2035 constraint = SPECIAL;
2036
2037 /* Check to see if we already have an output section statement
2038 with this name, and its bfd section has compatible flags.
2039 If the section already exists but does not have any flags
2040 set, then it has been created by the linker, possibly as a
2041 result of a --section-start command line switch. */
2042 if (os->bfd_section != NULL
2043 && (os->bfd_section->flags == 0
2044 || (((s->flags ^ os->bfd_section->flags)
2045 & (SEC_LOAD | SEC_ALLOC)) == 0
2046 && (!elfinput
2047 || !elfoutput
2048 || elf_orphan_compatible (s, os->bfd_section)))))
2049 {
2050 lang_add_section (&os->children, s, NULL, os);
2051 return os;
2052 }
2053
2054 /* Save unused output sections in case we can match them
2055 against orphans later. */
2056 if (os->bfd_section == NULL)
2057 match_by_name = os;
2058 }
2059
2060 /* If we didn't match an active output section, see if we matched an
2061 unused one and use that. */
2062 if (match_by_name)
2063 {
2064 lang_add_section (&match_by_name->children, s, NULL, match_by_name);
2065 return match_by_name;
2066 }
2067
2068 if (!orphan_init_done)
2069 {
2070 struct orphan_save *ho;
2071
2072 for (ho = hold; ho < hold + sizeof (hold) / sizeof (hold[0]); ++ho)
2073 if (ho->name != NULL)
2074 {
2075 ho->os = lang_output_section_find (ho->name);
2076 if (ho->os != NULL && ho->os->flags == 0)
2077 ho->os->flags = ho->flags;
2078 }
2079 orphan_init_done = 1;
2080 }
2081
2082 /* If this is a final link, then always put .gnu.warning.SYMBOL
2083 sections into the .text section to get them out of the way. */
2084 if (bfd_link_executable (&link_info)
2085 && CONST_STRNEQ (s->name, ".gnu.warning.")
2086 && hold[orphan_text].os != NULL)
2087 {
2088 os = hold[orphan_text].os;
2089 lang_add_section (&os->children, s, NULL, os);
2090 return os;
2091 }
2092
2093 flags = s->flags;
2094 if (!bfd_link_relocatable (&link_info))
2095 {
2096 nexts = s;
2097 while ((nexts = bfd_get_next_section_by_name (nexts->owner, nexts))
2098 != NULL)
2099 if (nexts->output_section == NULL
2100 && (nexts->flags & SEC_EXCLUDE) == 0
2101 && ((nexts->flags ^ flags) & (SEC_LOAD | SEC_ALLOC)) == 0
2102 && (nexts->owner->flags & DYNAMIC) == 0
00f93c44 2103 && !bfd_input_just_syms (nexts->owner)
d871d478
AM
2104 && _bfd_elf_match_sections_by_type (nexts->owner, nexts,
2105 s->owner, s))
2106 flags = (((flags ^ SEC_READONLY)
2107 | (nexts->flags ^ SEC_READONLY))
2108 ^ SEC_READONLY);
2109 }
2110
2111 /* Decide which segment the section should go in based on the
2112 section name and section flags. We put loadable .note sections
2113 right after the .interp section, so that the PT_NOTE segment is
2114 stored right after the program headers where the OS can read it
2115 in the first page. */
2116
2117 place = NULL;
2118 if ((flags & (SEC_ALLOC | SEC_DEBUGGING)) == 0)
2119 place = &hold[orphan_nonalloc];
2120 else if ((flags & SEC_ALLOC) == 0)
2121 ;
2122 else if ((flags & SEC_LOAD) != 0
2123 && (elfinput
2124 ? sh_type == SHT_NOTE
2125 : CONST_STRNEQ (secname, ".note")))
2126 place = &hold[orphan_interp];
2127 else if ((flags & (SEC_LOAD | SEC_HAS_CONTENTS | SEC_THREAD_LOCAL)) == 0)
2128 place = &hold[orphan_bss];
2129 else if ((flags & SEC_SMALL_DATA) != 0)
2130 place = &hold[orphan_sdata];
2131 else if ((flags & SEC_THREAD_LOCAL) != 0)
2132 place = &hold[orphan_tdata];
2133 else if ((flags & SEC_READONLY) == 0)
2134 place = &hold[orphan_data];
2135 else if ((flags & SEC_LOAD) != 0
2136 && (elfinput
2137 ? sh_type == SHT_RELA || sh_type == SHT_REL
2138 : CONST_STRNEQ (secname, ".rel")))
2139 place = &hold[orphan_rel];
2140 else if ((flags & SEC_CODE) == 0)
2141 place = &hold[orphan_rodata];
2142 else
2143 place = &hold[orphan_text];
2144
2145 after = NULL;
2146 if (place != NULL)
2147 {
2148 if (place->os == NULL)
2149 {
2150 if (place->name != NULL)
2151 place->os = lang_output_section_find (place->name);
2152 else
2153 {
2154 int rela = elfinput ? sh_type == SHT_RELA : secname[4] == 'a';
2155 place->os = output_rel_find (isdyn, rela);
2156 }
2157 }
2158 after = place->os;
2159 if (after == NULL)
2160 after
2161 = lang_output_section_find_by_flags (s, flags, &place->os,
2162 _bfd_elf_match_sections_by_type);
2163 if (after == NULL)
2164 /* *ABS* is always the first output section statement. */
8ce18f9c 2165 after = (void *) lang_os_list.head;
d871d478
AM
2166 }
2167
2168 return lang_insert_orphan (s, secname, constraint, after, place, NULL, NULL);
2169}
9b538ba7
L
2170
2171void
2172ldelf_before_place_orphans (void)
2173{
2174 bfd *abfd;
2175
2176 for (abfd = link_info.input_bfds;
2177 abfd != (bfd *) NULL; abfd = abfd->link.next)
2178 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
2179 && bfd_count_sections (abfd) != 0
2180 && !bfd_input_just_syms (abfd))
2181 {
2182 asection *isec;
2183 for (isec = abfd->sections; isec != NULL; isec = isec->next)
2184 {
2185 /* Discard a section if any of its linked-to section has
2186 been discarded. */
2187 asection *linked_to_sec;
2188 for (linked_to_sec = elf_linked_to_section (isec);
2189 linked_to_sec != NULL;
2190 linked_to_sec = elf_linked_to_section (linked_to_sec))
2191 if (discarded_section (linked_to_sec))
2192 {
2193 isec->output_section = bfd_abs_section_ptr;
5987401f 2194 isec->flags |= SEC_EXCLUDE;
9b538ba7
L
2195 break;
2196 }
2197 }
2198 }
2199}