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[thirdparty/binutils-gdb.git] / ld / emultempl / elf32.em
1 # This shell script emits a C file. -*- C -*-
2 # It does some substitutions.
3 # This file is now misnamed, because it supports both 32 bit and 64 bit
4 # ELF emulations.
5 test -z "${ELFSIZE}" && ELFSIZE=32
6 if [ -z "$MACHINE" ]; then
7 OUTPUT_ARCH=${ARCH}
8 else
9 OUTPUT_ARCH=${ARCH}:${MACHINE}
10 fi
11 fragment <<EOF
12 /* This file is is generated by a shell script. DO NOT EDIT! */
13
14 /* ${ELFSIZE} bit ELF emulation code for ${EMULATION_NAME}
15 Copyright 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
16 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
17 Free Software Foundation, Inc.
18 Written by Steve Chamberlain <sac@cygnus.com>
19 ELF support by Ian Lance Taylor <ian@cygnus.com>
20
21 This file is part of the GNU Binutils.
22
23 This program is free software; you can redistribute it and/or modify
24 it under the terms of the GNU General Public License as published by
25 the Free Software Foundation; either version 3 of the License, or
26 (at your option) any later version.
27
28 This program is distributed in the hope that it will be useful,
29 but WITHOUT ANY WARRANTY; without even the implied warranty of
30 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
31 GNU General Public License for more details.
32
33 You should have received a copy of the GNU General Public License
34 along with this program; if not, write to the Free Software
35 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
36 MA 02110-1301, USA. */
37
38 #define TARGET_IS_${EMULATION_NAME}
39
40 #include "sysdep.h"
41 #include "bfd.h"
42 #include "libiberty.h"
43 #include "filenames.h"
44 #include "safe-ctype.h"
45 #include "getopt.h"
46 #include "md5.h"
47 #include "sha1.h"
48 #include <fcntl.h>
49
50 #include "bfdlink.h"
51
52 #include "ld.h"
53 #include "ldmain.h"
54 #include "ldmisc.h"
55 #include "ldexp.h"
56 #include "ldlang.h"
57 #include "ldfile.h"
58 #include "ldemul.h"
59 #include <ldgram.h>
60 #include "elf/common.h"
61 #include "elf-bfd.h"
62 #include "filenames.h"
63
64 /* Declare functions used by various EXTRA_EM_FILEs. */
65 static void gld${EMULATION_NAME}_before_parse (void);
66 static void gld${EMULATION_NAME}_after_open (void);
67 static void gld${EMULATION_NAME}_before_allocation (void);
68 static void gld${EMULATION_NAME}_after_allocation (void);
69 static lang_output_section_statement_type *gld${EMULATION_NAME}_place_orphan
70 (asection *, const char *, int);
71 EOF
72
73 if [ "x${USE_LIBPATH}" = xyes ] ; then
74 case ${target} in
75 *-*-linux-* | *-*-k*bsd*-* | *-*-gnu*)
76 fragment <<EOF
77 #ifdef HAVE_GLOB
78 #include <glob.h>
79 #endif
80 EOF
81 ;;
82 esac
83 fi
84
85 # Import any needed special functions and/or overrides.
86 #
87 source_em ${srcdir}/emultempl/elf-generic.em
88 if test -n "$EXTRA_EM_FILE" ; then
89 source_em ${srcdir}/emultempl/${EXTRA_EM_FILE}.em
90 fi
91
92 # Functions in this file can be overridden by setting the LDEMUL_* shell
93 # variables. If the name of the overriding function is the same as is
94 # defined in this file, then don't output this file's version.
95 # If a different overriding name is given then output the standard function
96 # as presumably it is called from the overriding function.
97 #
98 if test x"$LDEMUL_BEFORE_PARSE" != xgld"$EMULATION_NAME"_before_parse; then
99 fragment <<EOF
100
101 static void
102 gld${EMULATION_NAME}_before_parse (void)
103 {
104 ldfile_set_output_arch ("${OUTPUT_ARCH}", bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`);
105 input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
106 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
107 config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
108 }
109
110 EOF
111 fi
112
113 if test x"$LDEMUL_RECOGNIZED_FILE" != xgld"${EMULATION_NAME}"_load_symbols; then
114 fragment <<EOF
115 /* Handle the generation of DT_NEEDED tags. */
116
117 static bfd_boolean
118 gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *entry)
119 {
120 int link_class = 0;
121
122 /* Tell the ELF linker that we don't want the output file to have a
123 DT_NEEDED entry for this file, unless it is used to resolve
124 references in a regular object. */
125 if (entry->flags.add_DT_NEEDED_for_regular)
126 link_class = DYN_AS_NEEDED;
127
128 /* Tell the ELF linker that we don't want the output file to have a
129 DT_NEEDED entry for any dynamic library in DT_NEEDED tags from
130 this file at all. */
131 if (!entry->flags.add_DT_NEEDED_for_dynamic)
132 link_class |= DYN_NO_ADD_NEEDED;
133
134 if (entry->flags.just_syms
135 && (bfd_get_file_flags (entry->the_bfd) & DYNAMIC) != 0)
136 einfo (_("%P%F: --just-symbols may not be used on DSO: %B\n"),
137 entry->the_bfd);
138
139 if (link_class == 0
140 || (bfd_get_file_flags (entry->the_bfd) & DYNAMIC) == 0)
141 return FALSE;
142
143 bfd_elf_set_dyn_lib_class (entry->the_bfd,
144 (enum dynamic_lib_link_class) link_class);
145
146 /* Continue on with normal load_symbols processing. */
147 return FALSE;
148 }
149 EOF
150 fi
151
152 fragment <<EOF
153
154 /* These variables are required to pass information back and forth
155 between after_open and check_needed and stat_needed and vercheck. */
156
157 static struct bfd_link_needed_list *global_needed;
158 static struct stat global_stat;
159 static lang_input_statement_type *global_found;
160 static struct bfd_link_needed_list *global_vercheck_needed;
161 static bfd_boolean global_vercheck_failed;
162
163 /* These variables are used to implement target options */
164
165 static char *audit; /* colon (typically) separated list of libs */
166 static char *depaudit; /* colon (typically) separated list of libs */
167
168 /* Style of .note.gnu.build-id section. */
169 static const char *emit_note_gnu_build_id;
170
171 /* On Linux, it's possible to have different versions of the same
172 shared library linked against different versions of libc. The
173 dynamic linker somehow tags which libc version to use in
174 /etc/ld.so.cache, and, based on the libc that it sees in the
175 executable, chooses which version of the shared library to use.
176
177 We try to do a similar check here by checking whether this shared
178 library needs any other shared libraries which may conflict with
179 libraries we have already included in the link. If it does, we
180 skip it, and try to find another shared library farther on down the
181 link path.
182
183 This is called via lang_for_each_input_file.
184 GLOBAL_VERCHECK_NEEDED is the list of objects needed by the object
185 which we are checking. This sets GLOBAL_VERCHECK_FAILED if we find
186 a conflicting version. */
187
188 static void
189 gld${EMULATION_NAME}_vercheck (lang_input_statement_type *s)
190 {
191 const char *soname;
192 struct bfd_link_needed_list *l;
193
194 if (global_vercheck_failed)
195 return;
196 if (s->the_bfd == NULL
197 || (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0)
198 return;
199
200 soname = bfd_elf_get_dt_soname (s->the_bfd);
201 if (soname == NULL)
202 soname = lbasename (bfd_get_filename (s->the_bfd));
203
204 for (l = global_vercheck_needed; l != NULL; l = l->next)
205 {
206 const char *suffix;
207
208 if (filename_cmp (soname, l->name) == 0)
209 {
210 /* Probably can't happen, but it's an easy check. */
211 continue;
212 }
213
214 if (strchr (l->name, '/') != NULL)
215 continue;
216
217 suffix = strstr (l->name, ".so.");
218 if (suffix == NULL)
219 continue;
220
221 suffix += sizeof ".so." - 1;
222
223 if (filename_ncmp (soname, l->name, suffix - l->name) == 0)
224 {
225 /* Here we know that S is a dynamic object FOO.SO.VER1, and
226 the object we are considering needs a dynamic object
227 FOO.SO.VER2, and VER1 and VER2 are different. This
228 appears to be a version mismatch, so we tell the caller
229 to try a different version of this library. */
230 global_vercheck_failed = TRUE;
231 return;
232 }
233 }
234 }
235
236
237 /* See if an input file matches a DT_NEEDED entry by running stat on
238 the file. */
239
240 static void
241 gld${EMULATION_NAME}_stat_needed (lang_input_statement_type *s)
242 {
243 struct stat st;
244 const char *suffix;
245 const char *soname;
246
247 if (global_found != NULL)
248 return;
249 if (s->the_bfd == NULL)
250 return;
251
252 /* If this input file was an as-needed entry, and wasn't found to be
253 needed at the stage it was linked, then don't say we have loaded it. */
254 if ((bfd_elf_get_dyn_lib_class (s->the_bfd) & DYN_AS_NEEDED) != 0)
255 return;
256
257 if (bfd_stat (s->the_bfd, &st) != 0)
258 {
259 einfo ("%P:%B: bfd_stat failed: %E\n", s->the_bfd);
260 return;
261 }
262
263 /* Some operating systems, e.g. Windows, do not provide a meaningful
264 st_ino; they always set it to zero. (Windows does provide a
265 meaningful st_dev.) Do not indicate a duplicate library in that
266 case. While there is no guarantee that a system that provides
267 meaningful inode numbers will never set st_ino to zero, this is
268 merely an optimization, so we do not need to worry about false
269 negatives. */
270 if (st.st_dev == global_stat.st_dev
271 && st.st_ino == global_stat.st_ino
272 && st.st_ino != 0)
273 {
274 global_found = s;
275 return;
276 }
277
278 /* We issue a warning if it looks like we are including two
279 different versions of the same shared library. For example,
280 there may be a problem if -lc picks up libc.so.6 but some other
281 shared library has a DT_NEEDED entry of libc.so.5. This is a
282 heuristic test, and it will only work if the name looks like
283 NAME.so.VERSION. FIXME: Depending on file names is error-prone.
284 If we really want to issue warnings about mixing version numbers
285 of shared libraries, we need to find a better way. */
286
287 if (strchr (global_needed->name, '/') != NULL)
288 return;
289 suffix = strstr (global_needed->name, ".so.");
290 if (suffix == NULL)
291 return;
292 suffix += sizeof ".so." - 1;
293
294 soname = bfd_elf_get_dt_soname (s->the_bfd);
295 if (soname == NULL)
296 soname = lbasename (s->filename);
297
298 if (filename_ncmp (soname, global_needed->name, suffix - global_needed->name) == 0)
299 einfo ("%P: warning: %s, needed by %B, may conflict with %s\n",
300 global_needed->name, global_needed->by, soname);
301 }
302
303 struct dt_needed
304 {
305 bfd *by;
306 const char *name;
307 };
308
309 /* This function is called for each possible name for a dynamic object
310 named by a DT_NEEDED entry. The FORCE parameter indicates whether
311 to skip the check for a conflicting version. */
312
313 static bfd_boolean
314 gld${EMULATION_NAME}_try_needed (struct dt_needed *needed,
315 int force)
316 {
317 bfd *abfd;
318 const char *name = needed->name;
319 const char *soname;
320 int link_class;
321
322 abfd = bfd_openr (name, bfd_get_target (link_info.output_bfd));
323 if (abfd == NULL)
324 return FALSE;
325
326 /* Linker needs to decompress sections. */
327 abfd->flags |= BFD_DECOMPRESS;
328
329 if (! bfd_check_format (abfd, bfd_object))
330 {
331 bfd_close (abfd);
332 return FALSE;
333 }
334 if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
335 {
336 bfd_close (abfd);
337 return FALSE;
338 }
339
340 /* For DT_NEEDED, they have to match. */
341 if (abfd->xvec != link_info.output_bfd->xvec)
342 {
343 bfd_close (abfd);
344 return FALSE;
345 }
346
347 /* Check whether this object would include any conflicting library
348 versions. If FORCE is set, then we skip this check; we use this
349 the second time around, if we couldn't find any compatible
350 instance of the shared library. */
351
352 if (! force)
353 {
354 struct bfd_link_needed_list *needs;
355
356 if (! bfd_elf_get_bfd_needed_list (abfd, &needs))
357 einfo ("%F%P:%B: bfd_elf_get_bfd_needed_list failed: %E\n", abfd);
358
359 if (needs != NULL)
360 {
361 global_vercheck_needed = needs;
362 global_vercheck_failed = FALSE;
363 lang_for_each_input_file (gld${EMULATION_NAME}_vercheck);
364 if (global_vercheck_failed)
365 {
366 bfd_close (abfd);
367 /* Return FALSE to force the caller to move on to try
368 another file on the search path. */
369 return FALSE;
370 }
371
372 /* But wait! It gets much worse. On Linux, if a shared
373 library does not use libc at all, we are supposed to skip
374 it the first time around in case we encounter a shared
375 library later on with the same name which does use the
376 version of libc that we want. This is much too horrible
377 to use on any system other than Linux. */
378
379 EOF
380 case ${target} in
381 *-*-linux-* | *-*-k*bsd*-* | *-*-gnu*)
382 fragment <<EOF
383 {
384 struct bfd_link_needed_list *l;
385
386 for (l = needs; l != NULL; l = l->next)
387 if (CONST_STRNEQ (l->name, "libc.so"))
388 break;
389 if (l == NULL)
390 {
391 bfd_close (abfd);
392 return FALSE;
393 }
394 }
395
396 EOF
397 ;;
398 esac
399 fragment <<EOF
400 }
401 }
402
403 /* We've found a dynamic object matching the DT_NEEDED entry. */
404
405 /* We have already checked that there is no other input file of the
406 same name. We must now check again that we are not including the
407 same file twice. We need to do this because on many systems
408 libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will
409 reference libc.so.1. If we have already included libc.so, we
410 don't want to include libc.so.1 if they are the same file, and we
411 can only check that using stat. */
412
413 if (bfd_stat (abfd, &global_stat) != 0)
414 einfo ("%F%P:%B: bfd_stat failed: %E\n", abfd);
415
416 /* First strip off everything before the last '/'. */
417 soname = lbasename (abfd->filename);
418
419 if (verbose)
420 info_msg (_("found %s at %s\n"), soname, name);
421
422 global_found = NULL;
423 lang_for_each_input_file (gld${EMULATION_NAME}_stat_needed);
424 if (global_found != NULL)
425 {
426 /* Return TRUE to indicate that we found the file, even though
427 we aren't going to do anything with it. */
428 return TRUE;
429 }
430
431 /* Specify the soname to use. */
432 bfd_elf_set_dt_needed_name (abfd, soname);
433
434 /* Tell the ELF linker that we don't want the output file to have a
435 DT_NEEDED entry for this file, unless it is used to resolve
436 references in a regular object. */
437 link_class = DYN_DT_NEEDED;
438
439 /* Tell the ELF linker that we don't want the output file to have a
440 DT_NEEDED entry for this file at all if the entry is from a file
441 with DYN_NO_ADD_NEEDED. */
442 if (needed->by != NULL
443 && (bfd_elf_get_dyn_lib_class (needed->by) & DYN_NO_ADD_NEEDED) != 0)
444 link_class |= DYN_NO_NEEDED | DYN_NO_ADD_NEEDED;
445
446 bfd_elf_set_dyn_lib_class (abfd, (enum dynamic_lib_link_class) link_class);
447
448 /* Add this file into the symbol table. */
449 if (! bfd_link_add_symbols (abfd, &link_info))
450 einfo ("%F%B: error adding symbols: %E\n", abfd);
451
452 return TRUE;
453 }
454
455
456 /* Search for a needed file in a path. */
457
458 static bfd_boolean
459 gld${EMULATION_NAME}_search_needed (const char *path,
460 struct dt_needed *n, int force)
461 {
462 const char *s;
463 const char *name = n->name;
464 size_t len;
465 struct dt_needed needed;
466
467 if (name[0] == '/')
468 return gld${EMULATION_NAME}_try_needed (n, force);
469
470 if (path == NULL || *path == '\0')
471 return FALSE;
472
473 needed.by = n->by;
474 needed.name = n->name;
475
476 len = strlen (name);
477 while (1)
478 {
479 char *filename, *sset;
480
481 s = strchr (path, config.rpath_separator);
482 if (s == NULL)
483 s = path + strlen (path);
484
485 #if HAVE_DOS_BASED_FILE_SYSTEM
486 /* Assume a match on the second char is part of drive specifier. */
487 else if (config.rpath_separator == ':'
488 && s == path + 1
489 && ISALPHA (*path))
490 {
491 s = strchr (s + 1, config.rpath_separator);
492 if (s == NULL)
493 s = path + strlen (path);
494 }
495 #endif
496 filename = (char *) xmalloc (s - path + len + 2);
497 if (s == path)
498 sset = filename;
499 else
500 {
501 memcpy (filename, path, s - path);
502 filename[s - path] = '/';
503 sset = filename + (s - path) + 1;
504 }
505 strcpy (sset, name);
506
507 needed.name = filename;
508 if (gld${EMULATION_NAME}_try_needed (&needed, force))
509 return TRUE;
510
511 free (filename);
512
513 if (*s == '\0')
514 break;
515 path = s + 1;
516 }
517
518 return FALSE;
519 }
520
521 EOF
522 if [ "x${USE_LIBPATH}" = xyes ] ; then
523 fragment <<EOF
524
525 /* Add the sysroot to every entry in a path separated by
526 config.rpath_separator. */
527
528 static char *
529 gld${EMULATION_NAME}_add_sysroot (const char *path)
530 {
531 int len, colons, i;
532 char *ret, *p;
533
534 len = strlen (path);
535 colons = 0;
536 i = 0;
537 while (path[i])
538 if (path[i++] == config.rpath_separator)
539 colons++;
540
541 if (path[i])
542 colons++;
543
544 len = len + (colons + 1) * strlen (ld_sysroot);
545 ret = xmalloc (len + 1);
546 strcpy (ret, ld_sysroot);
547 p = ret + strlen (ret);
548 i = 0;
549 while (path[i])
550 if (path[i] == config.rpath_separator)
551 {
552 *p++ = path[i++];
553 strcpy (p, ld_sysroot);
554 p = p + strlen (p);
555 }
556 else
557 *p++ = path[i++];
558
559 *p = 0;
560 return ret;
561 }
562
563 EOF
564 case ${target} in
565 *-*-freebsd* | *-*-dragonfly*)
566 fragment <<EOF
567 /* Read the system search path the FreeBSD way rather than the Linux way. */
568 #ifdef HAVE_ELF_HINTS_H
569 #include <elf-hints.h>
570 #else
571 #include "elf-hints-local.h"
572 #endif
573
574 static bfd_boolean
575 gld${EMULATION_NAME}_check_ld_elf_hints (const struct bfd_link_needed_list *l,
576 int force)
577 {
578 static bfd_boolean initialized;
579 static char *ld_elf_hints;
580 struct dt_needed needed;
581
582 if (!initialized)
583 {
584 FILE *f;
585 char *tmppath;
586
587 tmppath = concat (ld_sysroot, _PATH_ELF_HINTS, (const char *) NULL);
588 f = fopen (tmppath, FOPEN_RB);
589 free (tmppath);
590 if (f != NULL)
591 {
592 struct elfhints_hdr hdr;
593
594 if (fread (&hdr, 1, sizeof (hdr), f) == sizeof (hdr)
595 && hdr.magic == ELFHINTS_MAGIC
596 && hdr.version == 1)
597 {
598 if (fseek (f, hdr.strtab + hdr.dirlist, SEEK_SET) != -1)
599 {
600 char *b;
601
602 b = xmalloc (hdr.dirlistlen + 1);
603 if (fread (b, 1, hdr.dirlistlen + 1, f) ==
604 hdr.dirlistlen + 1)
605 ld_elf_hints = gld${EMULATION_NAME}_add_sysroot (b);
606
607 free (b);
608 }
609 }
610 fclose (f);
611 }
612
613 initialized = TRUE;
614 }
615
616 if (ld_elf_hints == NULL)
617 return FALSE;
618
619 needed.by = l->by;
620 needed.name = l->name;
621 return gld${EMULATION_NAME}_search_needed (ld_elf_hints, &needed, force);
622 }
623 EOF
624 # FreeBSD
625 ;;
626
627 *-*-linux-* | *-*-k*bsd*-* | *-*-gnu*)
628 fragment <<EOF
629 /* For a native linker, check the file /etc/ld.so.conf for directories
630 in which we may find shared libraries. /etc/ld.so.conf is really
631 only meaningful on Linux. */
632
633 struct gld${EMULATION_NAME}_ld_so_conf
634 {
635 char *path;
636 size_t len, alloc;
637 };
638
639 static bfd_boolean
640 gld${EMULATION_NAME}_parse_ld_so_conf
641 (struct gld${EMULATION_NAME}_ld_so_conf *info, const char *filename);
642
643 static void
644 gld${EMULATION_NAME}_parse_ld_so_conf_include
645 (struct gld${EMULATION_NAME}_ld_so_conf *info, const char *filename,
646 const char *pattern)
647 {
648 char *newp = NULL;
649 #ifdef HAVE_GLOB
650 glob_t gl;
651 #endif
652
653 if (pattern[0] != '/')
654 {
655 char *p = strrchr (filename, '/');
656 size_t patlen = strlen (pattern) + 1;
657
658 newp = xmalloc (p - filename + 1 + patlen);
659 memcpy (newp, filename, p - filename + 1);
660 memcpy (newp + (p - filename + 1), pattern, patlen);
661 pattern = newp;
662 }
663
664 #ifdef HAVE_GLOB
665 if (glob (pattern, 0, NULL, &gl) == 0)
666 {
667 size_t i;
668
669 for (i = 0; i < gl.gl_pathc; ++i)
670 gld${EMULATION_NAME}_parse_ld_so_conf (info, gl.gl_pathv[i]);
671 globfree (&gl);
672 }
673 #else
674 /* If we do not have glob, treat the pattern as a literal filename. */
675 gld${EMULATION_NAME}_parse_ld_so_conf (info, pattern);
676 #endif
677
678 if (newp)
679 free (newp);
680 }
681
682 static bfd_boolean
683 gld${EMULATION_NAME}_parse_ld_so_conf
684 (struct gld${EMULATION_NAME}_ld_so_conf *info, const char *filename)
685 {
686 FILE *f = fopen (filename, FOPEN_RT);
687 char *line;
688 size_t linelen;
689
690 if (f == NULL)
691 return FALSE;
692
693 linelen = 256;
694 line = xmalloc (linelen);
695 do
696 {
697 char *p = line, *q;
698
699 /* Normally this would use getline(3), but we need to be portable. */
700 while ((q = fgets (p, linelen - (p - line), f)) != NULL
701 && strlen (q) == linelen - (p - line) - 1
702 && line[linelen - 2] != '\n')
703 {
704 line = xrealloc (line, 2 * linelen);
705 p = line + linelen - 1;
706 linelen += linelen;
707 }
708
709 if (q == NULL && p == line)
710 break;
711
712 p = strchr (line, '\n');
713 if (p)
714 *p = '\0';
715
716 /* Because the file format does not know any form of quoting we
717 can search forward for the next '#' character and if found
718 make it terminating the line. */
719 p = strchr (line, '#');
720 if (p)
721 *p = '\0';
722
723 /* Remove leading whitespace. NUL is no whitespace character. */
724 p = line;
725 while (*p == ' ' || *p == '\f' || *p == '\r' || *p == '\t' || *p == '\v')
726 ++p;
727
728 /* If the line is blank it is ignored. */
729 if (p[0] == '\0')
730 continue;
731
732 if (CONST_STRNEQ (p, "include") && (p[7] == ' ' || p[7] == '\t'))
733 {
734 char *dir, c;
735 p += 8;
736 do
737 {
738 while (*p == ' ' || *p == '\t')
739 ++p;
740
741 if (*p == '\0')
742 break;
743
744 dir = p;
745
746 while (*p != ' ' && *p != '\t' && *p)
747 ++p;
748
749 c = *p;
750 *p++ = '\0';
751 if (dir[0] != '\0')
752 gld${EMULATION_NAME}_parse_ld_so_conf_include (info, filename,
753 dir);
754 }
755 while (c != '\0');
756 }
757 else
758 {
759 char *dir = p;
760 while (*p && *p != '=' && *p != ' ' && *p != '\t' && *p != '\f'
761 && *p != '\r' && *p != '\v')
762 ++p;
763
764 while (p != dir && p[-1] == '/')
765 --p;
766 if (info->path == NULL)
767 {
768 info->alloc = p - dir + 1 + 256;
769 info->path = xmalloc (info->alloc);
770 info->len = 0;
771 }
772 else
773 {
774 if (info->len + 1 + (p - dir) >= info->alloc)
775 {
776 info->alloc += p - dir + 256;
777 info->path = xrealloc (info->path, info->alloc);
778 }
779 info->path[info->len++] = config.rpath_separator;
780 }
781 memcpy (info->path + info->len, dir, p - dir);
782 info->len += p - dir;
783 info->path[info->len] = '\0';
784 }
785 }
786 while (! feof (f));
787 free (line);
788 fclose (f);
789 return TRUE;
790 }
791
792 static bfd_boolean
793 gld${EMULATION_NAME}_check_ld_so_conf (const struct bfd_link_needed_list *l,
794 int force)
795 {
796 static bfd_boolean initialized;
797 static char *ld_so_conf;
798 struct dt_needed needed;
799
800 if (! initialized)
801 {
802 char *tmppath;
803 struct gld${EMULATION_NAME}_ld_so_conf info;
804
805 info.path = NULL;
806 info.len = info.alloc = 0;
807 tmppath = concat (ld_sysroot, "${prefix}/etc/ld.so.conf",
808 (const char *) NULL);
809 if (!gld${EMULATION_NAME}_parse_ld_so_conf (&info, tmppath))
810 {
811 free (tmppath);
812 tmppath = concat (ld_sysroot, "/etc/ld.so.conf",
813 (const char *) NULL);
814 gld${EMULATION_NAME}_parse_ld_so_conf (&info, tmppath);
815 }
816 free (tmppath);
817
818 if (info.path)
819 {
820 char *d = gld${EMULATION_NAME}_add_sysroot (info.path);
821 free (info.path);
822 ld_so_conf = d;
823 }
824 initialized = TRUE;
825 }
826
827 if (ld_so_conf == NULL)
828 return FALSE;
829
830
831 needed.by = l->by;
832 needed.name = l->name;
833 return gld${EMULATION_NAME}_search_needed (ld_so_conf, &needed, force);
834 }
835
836 EOF
837 # Linux
838 ;;
839 esac
840 fi
841 fragment <<EOF
842
843 /* See if an input file matches a DT_NEEDED entry by name. */
844
845 static void
846 gld${EMULATION_NAME}_check_needed (lang_input_statement_type *s)
847 {
848 const char *soname;
849
850 /* Stop looking if we've found a loaded lib. */
851 if (global_found != NULL
852 && (bfd_elf_get_dyn_lib_class (global_found->the_bfd)
853 & DYN_AS_NEEDED) == 0)
854 return;
855
856 if (s->filename == NULL || s->the_bfd == NULL)
857 return;
858
859 /* Don't look for a second non-loaded as-needed lib. */
860 if (global_found != NULL
861 && (bfd_elf_get_dyn_lib_class (s->the_bfd) & DYN_AS_NEEDED) != 0)
862 return;
863
864 if (filename_cmp (s->filename, global_needed->name) == 0)
865 {
866 global_found = s;
867 return;
868 }
869
870 if (s->flags.search_dirs)
871 {
872 const char *f = strrchr (s->filename, '/');
873 if (f != NULL
874 && filename_cmp (f + 1, global_needed->name) == 0)
875 {
876 global_found = s;
877 return;
878 }
879 }
880
881 soname = bfd_elf_get_dt_soname (s->the_bfd);
882 if (soname != NULL
883 && filename_cmp (soname, global_needed->name) == 0)
884 {
885 global_found = s;
886 return;
887 }
888 }
889
890 EOF
891
892 if test x"$LDEMUL_AFTER_OPEN" != xgld"$EMULATION_NAME"_after_open; then
893 fragment <<EOF
894
895 static bfd_size_type
896 id_note_section_size (bfd *abfd)
897 {
898 const char *style = emit_note_gnu_build_id;
899 bfd_size_type size;
900
901 abfd = abfd;
902
903 size = offsetof (Elf_External_Note, name[sizeof "GNU"]);
904 size = (size + 3) & -(bfd_size_type) 4;
905
906 if (!strcmp (style, "md5") || !strcmp (style, "uuid"))
907 size += 128 / 8;
908 else if (!strcmp (style, "sha1"))
909 size += 160 / 8;
910 else if (!strncmp (style, "0x", 2))
911 {
912 /* ID is in string form (hex). Convert to bits. */
913 const char *id = style + 2;
914 do
915 {
916 if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
917 {
918 ++size;
919 id += 2;
920 }
921 else if (*id == '-' || *id == ':')
922 ++id;
923 else
924 {
925 size = 0;
926 break;
927 }
928 } while (*id != '\0');
929 }
930 else
931 size = 0;
932
933 return size;
934 }
935
936 static unsigned char
937 read_hex (const char xdigit)
938 {
939 if (ISDIGIT (xdigit))
940 return xdigit - '0';
941 if (ISUPPER (xdigit))
942 return xdigit - 'A' + 0xa;
943 if (ISLOWER (xdigit))
944 return xdigit - 'a' + 0xa;
945 abort ();
946 return 0;
947 }
948
949 static bfd_boolean
950 write_build_id (bfd *abfd)
951 {
952 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
953 struct elf_obj_tdata *t = elf_tdata (abfd);
954 const char *style;
955 asection *asec;
956 Elf_Internal_Shdr *i_shdr;
957 unsigned char *contents, *id_bits;
958 bfd_size_type size;
959 file_ptr position;
960 Elf_External_Note *e_note;
961 typedef void (*sum_fn) (const void *, size_t, void *);
962
963 style = t->o->build_id.style;
964 asec = t->o->build_id.sec;
965 if (bfd_is_abs_section (asec->output_section))
966 {
967 einfo (_("%P: warning: .note.gnu.build-id section discarded,"
968 " --build-id ignored.\n"));
969 return TRUE;
970 }
971 i_shdr = &elf_section_data (asec->output_section)->this_hdr;
972
973 if (i_shdr->contents == NULL)
974 {
975 if (asec->contents == NULL)
976 asec->contents = (unsigned char *) xmalloc (asec->size);
977 contents = asec->contents;
978 }
979 else
980 contents = i_shdr->contents + asec->output_offset;
981
982 e_note = (Elf_External_Note *) contents;
983 size = offsetof (Elf_External_Note, name[sizeof "GNU"]);
984 size = (size + 3) & -(bfd_size_type) 4;
985 id_bits = contents + size;
986 size = asec->size - size;
987
988 bfd_h_put_32 (abfd, sizeof "GNU", &e_note->namesz);
989 bfd_h_put_32 (abfd, size, &e_note->descsz);
990 bfd_h_put_32 (abfd, NT_GNU_BUILD_ID, &e_note->type);
991 memcpy (e_note->name, "GNU", sizeof "GNU");
992
993 if (strcmp (style, "md5") == 0)
994 {
995 struct md5_ctx ctx;
996
997 md5_init_ctx (&ctx);
998 if (!bed->s->checksum_contents (abfd, (sum_fn) &md5_process_bytes, &ctx))
999 return FALSE;
1000 md5_finish_ctx (&ctx, id_bits);
1001 }
1002 else if (strcmp (style, "sha1") == 0)
1003 {
1004 struct sha1_ctx ctx;
1005
1006 sha1_init_ctx (&ctx);
1007 if (!bed->s->checksum_contents (abfd, (sum_fn) &sha1_process_bytes, &ctx))
1008 return FALSE;
1009 sha1_finish_ctx (&ctx, id_bits);
1010 }
1011 else if (strcmp (style, "uuid") == 0)
1012 {
1013 int n;
1014 int fd = open ("/dev/urandom", O_RDONLY);
1015 if (fd < 0)
1016 return FALSE;
1017 n = read (fd, id_bits, size);
1018 close (fd);
1019 if (n < (int) size)
1020 return FALSE;
1021 }
1022 else if (strncmp (style, "0x", 2) == 0)
1023 {
1024 /* ID is in string form (hex). Convert to bits. */
1025 const char *id = style + 2;
1026 size_t n = 0;
1027 do
1028 {
1029 if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
1030 {
1031 id_bits[n] = read_hex (*id++) << 4;
1032 id_bits[n++] |= read_hex (*id++);
1033 }
1034 else if (*id == '-' || *id == ':')
1035 ++id;
1036 else
1037 abort (); /* Should have been validated earlier. */
1038 } while (*id != '\0');
1039 }
1040 else
1041 abort (); /* Should have been validated earlier. */
1042
1043 position = i_shdr->sh_offset + asec->output_offset;
1044 size = asec->size;
1045 return (bfd_seek (abfd, position, SEEK_SET) == 0
1046 && bfd_bwrite (contents, size, abfd) == size);
1047 }
1048
1049 /* Make .note.gnu.build-id section, and set up elf_tdata->build_id. */
1050
1051 static bfd_boolean
1052 setup_build_id (bfd *ibfd)
1053 {
1054 asection *s;
1055 bfd_size_type size;
1056 flagword flags;
1057
1058 size = id_note_section_size (ibfd);
1059 if (size == 0)
1060 {
1061 einfo ("%P: warning: unrecognized --build-id style ignored.\n");
1062 return FALSE;
1063 }
1064
1065 flags = (SEC_ALLOC | SEC_LOAD | SEC_IN_MEMORY
1066 | SEC_LINKER_CREATED | SEC_READONLY | SEC_DATA);
1067 s = bfd_make_section_with_flags (ibfd, ".note.gnu.build-id", flags);
1068 if (s != NULL && bfd_set_section_alignment (ibfd, s, 2))
1069 {
1070 struct elf_obj_tdata *t = elf_tdata (link_info.output_bfd);
1071 t->o->build_id.after_write_object_contents = &write_build_id;
1072 t->o->build_id.style = emit_note_gnu_build_id;
1073 t->o->build_id.sec = s;
1074 elf_section_type (s) = SHT_NOTE;
1075 s->size = size;
1076 return TRUE;
1077 }
1078
1079 einfo ("%P: warning: Cannot create .note.gnu.build-id section,"
1080 " --build-id ignored.\n");
1081 return FALSE;
1082 }
1083
1084 /* This is called after all the input files have been opened. */
1085
1086 static void
1087 gld${EMULATION_NAME}_after_open (void)
1088 {
1089 struct bfd_link_needed_list *needed, *l;
1090 struct elf_link_hash_table *htab;
1091
1092 after_open_default ();
1093
1094 htab = elf_hash_table (&link_info);
1095 if (!is_elf_hash_table (htab))
1096 return;
1097
1098 if (emit_note_gnu_build_id != NULL)
1099 {
1100 bfd *abfd;
1101
1102 /* Find an ELF input. */
1103 for (abfd = link_info.input_bfds;
1104 abfd != (bfd *) NULL; abfd = abfd->link_next)
1105 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
1106 break;
1107
1108 /* PR 10555: If there are no ELF input files do not try to
1109 create a .note.gnu-build-id section. */
1110 if (abfd == NULL
1111 || !setup_build_id (abfd))
1112 {
1113 free ((char *) emit_note_gnu_build_id);
1114 emit_note_gnu_build_id = NULL;
1115 }
1116 }
1117
1118 if (link_info.relocatable)
1119 return;
1120
1121 if (link_info.eh_frame_hdr
1122 && !link_info.traditional_format)
1123 {
1124 bfd *abfd, *elfbfd = NULL;
1125 bfd_boolean warn_eh_frame = FALSE;
1126 asection *s;
1127
1128 for (abfd = link_info.input_bfds; abfd; abfd = abfd->link_next)
1129 {
1130 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
1131 elfbfd = abfd;
1132 if (!warn_eh_frame)
1133 {
1134 s = bfd_get_section_by_name (abfd, ".eh_frame");
1135 while (s != NULL
1136 && (s->size <= 8
1137 || bfd_is_abs_section (s->output_section)))
1138 s = bfd_get_next_section_by_name (s);
1139 warn_eh_frame = s != NULL;
1140 }
1141 if (elfbfd && warn_eh_frame)
1142 break;
1143 }
1144 if (elfbfd)
1145 {
1146 const struct elf_backend_data *bed;
1147
1148 bed = get_elf_backend_data (elfbfd);
1149 s = bfd_make_section_with_flags (elfbfd, ".eh_frame_hdr",
1150 bed->dynamic_sec_flags
1151 | SEC_READONLY);
1152 if (s != NULL
1153 && bfd_set_section_alignment (elfbfd, s, 2))
1154 {
1155 htab->eh_info.hdr_sec = s;
1156 warn_eh_frame = FALSE;
1157 }
1158 }
1159 if (warn_eh_frame)
1160 einfo ("%P: warning: Cannot create .eh_frame_hdr section,"
1161 " --eh-frame-hdr ignored.\n");
1162 }
1163
1164 /* Get the list of files which appear in DT_NEEDED entries in
1165 dynamic objects included in the link (often there will be none).
1166 For each such file, we want to track down the corresponding
1167 library, and include the symbol table in the link. This is what
1168 the runtime dynamic linker will do. Tracking the files down here
1169 permits one dynamic object to include another without requiring
1170 special action by the person doing the link. Note that the
1171 needed list can actually grow while we are stepping through this
1172 loop. */
1173 needed = bfd_elf_get_needed_list (link_info.output_bfd, &link_info);
1174 for (l = needed; l != NULL; l = l->next)
1175 {
1176 struct bfd_link_needed_list *ll;
1177 struct dt_needed n, nn;
1178 int force;
1179
1180 /* If the lib that needs this one was --as-needed and wasn't
1181 found to be needed, then this lib isn't needed either. Skip
1182 the lib when creating a shared object unless we are copying
1183 DT_NEEDED entres. */
1184 if (l->by != NULL
1185 && ((bfd_elf_get_dyn_lib_class (l->by) & DYN_AS_NEEDED) != 0
1186 || (!link_info.executable
1187 && bfd_elf_get_dyn_lib_class (l->by) & DYN_NO_ADD_NEEDED) != 0))
1188 continue;
1189
1190 /* If we've already seen this file, skip it. */
1191 for (ll = needed; ll != l; ll = ll->next)
1192 if ((ll->by == NULL
1193 || (bfd_elf_get_dyn_lib_class (ll->by) & DYN_AS_NEEDED) == 0)
1194 && strcmp (ll->name, l->name) == 0)
1195 break;
1196 if (ll != l)
1197 continue;
1198
1199 /* See if this file was included in the link explicitly. */
1200 global_needed = l;
1201 global_found = NULL;
1202 lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
1203 if (global_found != NULL
1204 && (bfd_elf_get_dyn_lib_class (global_found->the_bfd)
1205 & DYN_AS_NEEDED) == 0)
1206 continue;
1207
1208 n.by = l->by;
1209 n.name = l->name;
1210 nn.by = l->by;
1211 if (verbose)
1212 info_msg (_("%s needed by %B\n"), l->name, l->by);
1213
1214 /* As-needed libs specified on the command line (or linker script)
1215 take priority over libs found in search dirs. */
1216 if (global_found != NULL)
1217 {
1218 nn.name = global_found->filename;
1219 if (gld${EMULATION_NAME}_try_needed (&nn, TRUE))
1220 continue;
1221 }
1222
1223 /* We need to find this file and include the symbol table. We
1224 want to search for the file in the same way that the dynamic
1225 linker will search. That means that we want to use
1226 rpath_link, rpath, then the environment variable
1227 LD_LIBRARY_PATH (native only), then the DT_RPATH/DT_RUNPATH
1228 entries (native only), then the linker script LIB_SEARCH_DIRS.
1229 We do not search using the -L arguments.
1230
1231 We search twice. The first time, we skip objects which may
1232 introduce version mismatches. The second time, we force
1233 their use. See gld${EMULATION_NAME}_vercheck comment. */
1234 for (force = 0; force < 2; force++)
1235 {
1236 size_t len;
1237 search_dirs_type *search;
1238 EOF
1239 if [ "x${NATIVE}" = xyes ] ; then
1240 fragment <<EOF
1241 const char *lib_path;
1242 EOF
1243 fi
1244 if [ "x${USE_LIBPATH}" = xyes ] ; then
1245 fragment <<EOF
1246 struct bfd_link_needed_list *rp;
1247 int found;
1248 EOF
1249 fi
1250 fragment <<EOF
1251
1252 if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
1253 &n, force))
1254 break;
1255 EOF
1256 if [ "x${USE_LIBPATH}" = xyes ] ; then
1257 fragment <<EOF
1258 if (gld${EMULATION_NAME}_search_needed (command_line.rpath,
1259 &n, force))
1260 break;
1261 EOF
1262 fi
1263 if [ "x${NATIVE}" = xyes ] ; then
1264 fragment <<EOF
1265 if (command_line.rpath_link == NULL
1266 && command_line.rpath == NULL)
1267 {
1268 lib_path = (const char *) getenv ("LD_RUN_PATH");
1269 if (gld${EMULATION_NAME}_search_needed (lib_path, &n,
1270 force))
1271 break;
1272 }
1273 lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
1274 if (gld${EMULATION_NAME}_search_needed (lib_path, &n, force))
1275 break;
1276 EOF
1277 fi
1278 if [ "x${USE_LIBPATH}" = xyes ] ; then
1279 fragment <<EOF
1280 found = 0;
1281 rp = bfd_elf_get_runpath_list (link_info.output_bfd, &link_info);
1282 for (; !found && rp != NULL; rp = rp->next)
1283 {
1284 char *tmpname = gld${EMULATION_NAME}_add_sysroot (rp->name);
1285 found = (rp->by == l->by
1286 && gld${EMULATION_NAME}_search_needed (tmpname,
1287 &n,
1288 force));
1289 free (tmpname);
1290 }
1291 if (found)
1292 break;
1293
1294 EOF
1295 fi
1296 if [ "x${USE_LIBPATH}" = xyes ] ; then
1297 case ${target} in
1298 *-*-freebsd* | *-*-dragonfly*)
1299 fragment <<EOF
1300 if (gld${EMULATION_NAME}_check_ld_elf_hints (l, force))
1301 break;
1302 EOF
1303 # FreeBSD
1304 ;;
1305
1306 *-*-linux-* | *-*-k*bsd*-* | *-*-gnu*)
1307 fragment <<EOF
1308 if (gld${EMULATION_NAME}_check_ld_so_conf (l, force))
1309 break;
1310
1311 EOF
1312 # Linux
1313 ;;
1314 esac
1315 fi
1316 fragment <<EOF
1317 len = strlen (l->name);
1318 for (search = search_head; search != NULL; search = search->next)
1319 {
1320 char *filename;
1321
1322 if (search->cmdline)
1323 continue;
1324 filename = (char *) xmalloc (strlen (search->name) + len + 2);
1325 sprintf (filename, "%s/%s", search->name, l->name);
1326 nn.name = filename;
1327 if (gld${EMULATION_NAME}_try_needed (&nn, force))
1328 break;
1329 free (filename);
1330 }
1331 if (search != NULL)
1332 break;
1333 EOF
1334 fragment <<EOF
1335 }
1336
1337 if (force < 2)
1338 continue;
1339
1340 einfo ("%P: warning: %s, needed by %B, not found (try using -rpath or -rpath-link)\n",
1341 l->name, l->by);
1342 }
1343 }
1344
1345 EOF
1346 fi
1347
1348 fragment <<EOF
1349
1350 /* Look through an expression for an assignment statement. */
1351
1352 static void
1353 gld${EMULATION_NAME}_find_exp_assignment (etree_type *exp)
1354 {
1355 bfd_boolean provide = FALSE;
1356
1357 switch (exp->type.node_class)
1358 {
1359 case etree_provide:
1360 case etree_provided:
1361 provide = TRUE;
1362 /* Fall thru */
1363 case etree_assign:
1364 /* We call record_link_assignment even if the symbol is defined.
1365 This is because if it is defined by a dynamic object, we
1366 actually want to use the value defined by the linker script,
1367 not the value from the dynamic object (because we are setting
1368 symbols like etext). If the symbol is defined by a regular
1369 object, then, as it happens, calling record_link_assignment
1370 will do no harm. */
1371 if (strcmp (exp->assign.dst, ".") != 0)
1372 {
1373 if (!bfd_elf_record_link_assignment (link_info.output_bfd,
1374 &link_info,
1375 exp->assign.dst, provide,
1376 exp->assign.hidden))
1377 einfo ("%P%F: failed to record assignment to %s: %E\n",
1378 exp->assign.dst);
1379 }
1380 gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
1381 break;
1382
1383 case etree_binary:
1384 gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
1385 gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
1386 break;
1387
1388 case etree_trinary:
1389 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
1390 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
1391 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
1392 break;
1393
1394 case etree_unary:
1395 gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
1396 break;
1397
1398 default:
1399 break;
1400 }
1401 }
1402
1403
1404 /* This is called by the before_allocation routine via
1405 lang_for_each_statement. It locates any assignment statements, and
1406 tells the ELF backend about them, in case they are assignments to
1407 symbols which are referred to by dynamic objects. */
1408
1409 static void
1410 gld${EMULATION_NAME}_find_statement_assignment (lang_statement_union_type *s)
1411 {
1412 if (s->header.type == lang_assignment_statement_enum)
1413 gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
1414 }
1415
1416 EOF
1417
1418 if test x"$LDEMUL_BEFORE_ALLOCATION" != xgld"$EMULATION_NAME"_before_allocation; then
1419 if test x"${ELF_INTERPRETER_NAME+set}" = xset; then
1420 ELF_INTERPRETER_SET_DEFAULT="
1421 if (sinterp != NULL)
1422 {
1423 sinterp->contents = (unsigned char *) ${ELF_INTERPRETER_NAME};
1424 sinterp->size = strlen ((char *) sinterp->contents) + 1;
1425 }
1426
1427 "
1428 else
1429 ELF_INTERPRETER_SET_DEFAULT=
1430 fi
1431 fragment <<EOF
1432
1433 /* used by before_allocation and handle_option. */
1434 static void
1435 gld${EMULATION_NAME}_append_to_separated_string (char **to, char *op_arg)
1436 {
1437 if (*to == NULL)
1438 *to = xstrdup (op_arg);
1439 else
1440 {
1441 size_t to_len = strlen (*to);
1442 size_t op_arg_len = strlen (op_arg);
1443 char *buf;
1444 char *cp = *to;
1445
1446 /* First see whether OPTARG is already in the path. */
1447 do
1448 {
1449 if (strncmp (op_arg, cp, op_arg_len) == 0
1450 && (cp[op_arg_len] == 0
1451 || cp[op_arg_len] == config.rpath_separator))
1452 /* We found it. */
1453 break;
1454
1455 /* Not yet found. */
1456 cp = strchr (cp, config.rpath_separator);
1457 if (cp != NULL)
1458 ++cp;
1459 }
1460 while (cp != NULL);
1461
1462 if (cp == NULL)
1463 {
1464 buf = xmalloc (to_len + op_arg_len + 2);
1465 sprintf (buf, "%s%c%s", *to,
1466 config.rpath_separator, op_arg);
1467 free (*to);
1468 *to = buf;
1469 }
1470 }
1471 }
1472
1473 /* This is called after the sections have been attached to output
1474 sections, but before any sizes or addresses have been set. */
1475
1476 static void
1477 gld${EMULATION_NAME}_before_allocation (void)
1478 {
1479 const char *rpath;
1480 asection *sinterp;
1481 bfd *abfd;
1482
1483 if (link_info.hash->type == bfd_link_elf_hash_table)
1484 _bfd_elf_tls_setup (link_info.output_bfd, &link_info);
1485
1486 /* If we are going to make any variable assignments, we need to let
1487 the ELF backend know about them in case the variables are
1488 referred to by dynamic objects. */
1489 lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);
1490
1491 /* Let the ELF backend work out the sizes of any sections required
1492 by dynamic linking. */
1493 rpath = command_line.rpath;
1494 if (rpath == NULL)
1495 rpath = (const char *) getenv ("LD_RUN_PATH");
1496
1497 for (abfd = link_info.input_bfds; abfd; abfd = abfd->link_next)
1498 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
1499 {
1500 const char *audit_libs = elf_dt_audit (abfd);
1501
1502 /* If the input bfd contains an audit entry, we need to add it as
1503 a dep audit entry. */
1504 if (audit_libs && *audit_libs != '\0')
1505 {
1506 char *cp = xstrdup (audit_libs);
1507 do
1508 {
1509 int more = 0;
1510 char *cp2 = strchr (cp, config.rpath_separator);
1511
1512 if (cp2)
1513 {
1514 *cp2 = '\0';
1515 more = 1;
1516 }
1517
1518 if (cp != NULL && *cp != '\0')
1519 gld${EMULATION_NAME}_append_to_separated_string (&depaudit, cp);
1520
1521 cp = more ? ++cp2 : NULL;
1522 }
1523 while (cp != NULL);
1524 }
1525 }
1526
1527 if (! (bfd_elf_size_dynamic_sections
1528 (link_info.output_bfd, command_line.soname, rpath,
1529 command_line.filter_shlib, audit, depaudit,
1530 (const char * const *) command_line.auxiliary_filters,
1531 &link_info, &sinterp)))
1532 einfo ("%P%F: failed to set dynamic section sizes: %E\n");
1533
1534 ${ELF_INTERPRETER_SET_DEFAULT}
1535 /* Let the user override the dynamic linker we are using. */
1536 if (command_line.interpreter != NULL
1537 && sinterp != NULL)
1538 {
1539 sinterp->contents = (bfd_byte *) command_line.interpreter;
1540 sinterp->size = strlen (command_line.interpreter) + 1;
1541 }
1542
1543 /* Look for any sections named .gnu.warning. As a GNU extensions,
1544 we treat such sections as containing warning messages. We print
1545 out the warning message, and then zero out the section size so
1546 that it does not get copied into the output file. */
1547
1548 {
1549 LANG_FOR_EACH_INPUT_STATEMENT (is)
1550 {
1551 asection *s;
1552 bfd_size_type sz;
1553 char *msg;
1554 bfd_boolean ret;
1555
1556 if (is->flags.just_syms)
1557 continue;
1558
1559 s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
1560 if (s == NULL)
1561 continue;
1562
1563 sz = s->size;
1564 msg = (char *) xmalloc ((size_t) (sz + 1));
1565 if (! bfd_get_section_contents (is->the_bfd, s, msg,
1566 (file_ptr) 0, sz))
1567 einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n",
1568 is->the_bfd);
1569 msg[sz] = '\0';
1570 ret = link_info.callbacks->warning (&link_info, msg,
1571 (const char *) NULL,
1572 is->the_bfd, (asection *) NULL,
1573 (bfd_vma) 0);
1574 ASSERT (ret);
1575 free (msg);
1576
1577 /* Clobber the section size, so that we don't waste space
1578 copying the warning into the output file. If we've already
1579 sized the output section, adjust its size. The adjustment
1580 is on rawsize because targets that size sections early will
1581 have called lang_reset_memory_regions after sizing. */
1582 if (s->output_section != NULL
1583 && s->output_section->rawsize >= s->size)
1584 s->output_section->rawsize -= s->size;
1585
1586 s->size = 0;
1587
1588 /* Also set SEC_EXCLUDE, so that local symbols defined in the
1589 warning section don't get copied to the output. */
1590 s->flags |= SEC_EXCLUDE | SEC_KEEP;
1591 }
1592 }
1593
1594 before_allocation_default ();
1595
1596 if (!bfd_elf_size_dynsym_hash_dynstr (link_info.output_bfd, &link_info))
1597 einfo ("%P%F: failed to set dynamic section sizes: %E\n");
1598 }
1599
1600 EOF
1601 fi
1602
1603 if test x"$LDEMUL_OPEN_DYNAMIC_ARCHIVE" != xgld"$EMULATION_NAME"_open_dynamic_archive; then
1604 fragment <<EOF
1605
1606 /* Try to open a dynamic archive. This is where we know that ELF
1607 dynamic libraries have an extension of .so (or .sl on oddball systems
1608 like hpux). */
1609
1610 static bfd_boolean
1611 gld${EMULATION_NAME}_open_dynamic_archive
1612 (const char *arch, search_dirs_type *search, lang_input_statement_type *entry)
1613 {
1614 const char *filename;
1615 char *string;
1616
1617 if (! entry->flags.maybe_archive)
1618 return FALSE;
1619
1620 filename = entry->filename;
1621
1622 /* This allocates a few bytes too many when EXTRA_SHLIB_EXTENSION
1623 is defined, but it does not seem worth the headache to optimize
1624 away those two bytes of space. */
1625 string = (char *) xmalloc (strlen (search->name)
1626 + strlen (filename)
1627 + strlen (arch)
1628 #ifdef EXTRA_SHLIB_EXTENSION
1629 + strlen (EXTRA_SHLIB_EXTENSION)
1630 #endif
1631 + sizeof "/lib.so");
1632
1633 sprintf (string, "%s/lib%s%s.so", search->name, filename, arch);
1634
1635 #ifdef EXTRA_SHLIB_EXTENSION
1636 /* Try the .so extension first. If that fails build a new filename
1637 using EXTRA_SHLIB_EXTENSION. */
1638 if (! ldfile_try_open_bfd (string, entry))
1639 {
1640 sprintf (string, "%s/lib%s%s%s", search->name,
1641 filename, arch, EXTRA_SHLIB_EXTENSION);
1642 #endif
1643
1644 if (! ldfile_try_open_bfd (string, entry))
1645 {
1646 free (string);
1647 return FALSE;
1648 }
1649 #ifdef EXTRA_SHLIB_EXTENSION
1650 }
1651 #endif
1652
1653 entry->filename = string;
1654
1655 /* We have found a dynamic object to include in the link. The ELF
1656 backend linker will create a DT_NEEDED entry in the .dynamic
1657 section naming this file. If this file includes a DT_SONAME
1658 entry, it will be used. Otherwise, the ELF linker will just use
1659 the name of the file. For an archive found by searching, like
1660 this one, the DT_NEEDED entry should consist of just the name of
1661 the file, without the path information used to find it. Note
1662 that we only need to do this if we have a dynamic object; an
1663 archive will never be referenced by a DT_NEEDED entry.
1664
1665 FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
1666 very pretty. I haven't been able to think of anything that is
1667 pretty, though. */
1668 if (bfd_check_format (entry->the_bfd, bfd_object)
1669 && (entry->the_bfd->flags & DYNAMIC) != 0)
1670 {
1671 ASSERT (entry->flags.maybe_archive && entry->flags.search_dirs);
1672
1673 /* Rather than duplicating the logic above. Just use the
1674 filename we recorded earlier. */
1675
1676 filename = lbasename (entry->filename);
1677 bfd_elf_set_dt_needed_name (entry->the_bfd, filename);
1678 }
1679
1680 return TRUE;
1681 }
1682
1683 EOF
1684 fi
1685
1686 if test x"$LDEMUL_PLACE_ORPHAN" != xgld"$EMULATION_NAME"_place_orphan; then
1687 fragment <<EOF
1688
1689 /* A variant of lang_output_section_find used by place_orphan. */
1690
1691 static lang_output_section_statement_type *
1692 output_rel_find (asection *sec, int isdyn)
1693 {
1694 lang_output_section_statement_type *lookup;
1695 lang_output_section_statement_type *last = NULL;
1696 lang_output_section_statement_type *last_alloc = NULL;
1697 lang_output_section_statement_type *last_ro_alloc = NULL;
1698 lang_output_section_statement_type *last_rel = NULL;
1699 lang_output_section_statement_type *last_rel_alloc = NULL;
1700 int rela = sec->name[4] == 'a';
1701
1702 for (lookup = &lang_output_section_statement.head->output_section_statement;
1703 lookup != NULL;
1704 lookup = lookup->next)
1705 {
1706 if (lookup->constraint >= 0
1707 && CONST_STRNEQ (lookup->name, ".rel"))
1708 {
1709 int lookrela = lookup->name[4] == 'a';
1710
1711 /* .rel.dyn must come before all other reloc sections, to suit
1712 GNU ld.so. */
1713 if (isdyn)
1714 break;
1715
1716 /* Don't place after .rel.plt as doing so results in wrong
1717 dynamic tags. */
1718 if (strcmp (".plt", lookup->name + 4 + lookrela) == 0)
1719 break;
1720
1721 if (rela == lookrela || last_rel == NULL)
1722 last_rel = lookup;
1723 if ((rela == lookrela || last_rel_alloc == NULL)
1724 && lookup->bfd_section != NULL
1725 && (lookup->bfd_section->flags & SEC_ALLOC) != 0)
1726 last_rel_alloc = lookup;
1727 }
1728
1729 last = lookup;
1730 if (lookup->bfd_section != NULL
1731 && (lookup->bfd_section->flags & SEC_ALLOC) != 0)
1732 {
1733 last_alloc = lookup;
1734 if ((lookup->bfd_section->flags & SEC_READONLY) != 0)
1735 last_ro_alloc = lookup;
1736 }
1737 }
1738
1739 if (last_rel_alloc)
1740 return last_rel_alloc;
1741
1742 if (last_rel)
1743 return last_rel;
1744
1745 if (last_ro_alloc)
1746 return last_ro_alloc;
1747
1748 if (last_alloc)
1749 return last_alloc;
1750
1751 return last;
1752 }
1753
1754 /* Place an orphan section. We use this to put random SHF_ALLOC
1755 sections in the right segment. */
1756
1757 static lang_output_section_statement_type *
1758 gld${EMULATION_NAME}_place_orphan (asection *s,
1759 const char *secname,
1760 int constraint)
1761 {
1762 static struct orphan_save hold[] =
1763 {
1764 { ".text",
1765 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE,
1766 0, 0, 0, 0 },
1767 { ".rodata",
1768 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA,
1769 0, 0, 0, 0 },
1770 { ".data",
1771 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA,
1772 0, 0, 0, 0 },
1773 { ".bss",
1774 SEC_ALLOC,
1775 0, 0, 0, 0 },
1776 { 0,
1777 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA,
1778 0, 0, 0, 0 },
1779 { ".interp",
1780 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA,
1781 0, 0, 0, 0 },
1782 { ".sdata",
1783 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_SMALL_DATA,
1784 0, 0, 0, 0 },
1785 { ".comment",
1786 SEC_HAS_CONTENTS,
1787 0, 0, 0, 0 },
1788 };
1789 enum orphan_save_index
1790 {
1791 orphan_text = 0,
1792 orphan_rodata,
1793 orphan_data,
1794 orphan_bss,
1795 orphan_rel,
1796 orphan_interp,
1797 orphan_sdata,
1798 orphan_nonalloc
1799 };
1800 static int orphan_init_done = 0;
1801 struct orphan_save *place;
1802 lang_output_section_statement_type *after;
1803 lang_output_section_statement_type *os;
1804 lang_output_section_statement_type *match_by_name = NULL;
1805 int isdyn = 0;
1806 int iself = s->owner->xvec->flavour == bfd_target_elf_flavour;
1807 unsigned int sh_type = iself ? elf_section_type (s) : SHT_NULL;
1808
1809 if (! link_info.relocatable
1810 && link_info.combreloc
1811 && (s->flags & SEC_ALLOC))
1812 {
1813 if (iself)
1814 switch (sh_type)
1815 {
1816 case SHT_RELA:
1817 secname = ".rela.dyn";
1818 isdyn = 1;
1819 break;
1820 case SHT_REL:
1821 secname = ".rel.dyn";
1822 isdyn = 1;
1823 break;
1824 default:
1825 break;
1826 }
1827 else if (CONST_STRNEQ (secname, ".rel"))
1828 {
1829 secname = secname[4] == 'a' ? ".rela.dyn" : ".rel.dyn";
1830 isdyn = 1;
1831 }
1832 }
1833
1834 /* Look through the script to see where to place this section. */
1835 if (constraint == 0)
1836 for (os = lang_output_section_find (secname);
1837 os != NULL;
1838 os = next_matching_output_section_statement (os, 0))
1839 {
1840 /* If we don't match an existing output section, tell
1841 lang_insert_orphan to create a new output section. */
1842 constraint = SPECIAL;
1843
1844 if (os->bfd_section != NULL
1845 && (os->bfd_section->flags == 0
1846 || (_bfd_elf_match_sections_by_type (link_info.output_bfd,
1847 os->bfd_section,
1848 s->owner, s)
1849 && ((s->flags ^ os->bfd_section->flags)
1850 & (SEC_LOAD | SEC_ALLOC)) == 0)))
1851 {
1852 /* We already have an output section statement with this
1853 name, and its bfd section has compatible flags.
1854 If the section already exists but does not have any flags
1855 set, then it has been created by the linker, probably as a
1856 result of a --section-start command line switch. */
1857 lang_add_section (&os->children, s, NULL, os);
1858 return os;
1859 }
1860
1861 /* Save unused output sections in case we can match them
1862 against orphans later. */
1863 if (os->bfd_section == NULL)
1864 match_by_name = os;
1865 }
1866
1867 /* If we didn't match an active output section, see if we matched an
1868 unused one and use that. */
1869 if (match_by_name)
1870 {
1871 lang_add_section (&match_by_name->children, s, NULL, match_by_name);
1872 return match_by_name;
1873 }
1874
1875 if (!orphan_init_done)
1876 {
1877 struct orphan_save *ho;
1878
1879 for (ho = hold; ho < hold + sizeof (hold) / sizeof (hold[0]); ++ho)
1880 if (ho->name != NULL)
1881 {
1882 ho->os = lang_output_section_find (ho->name);
1883 if (ho->os != NULL && ho->os->flags == 0)
1884 ho->os->flags = ho->flags;
1885 }
1886 orphan_init_done = 1;
1887 }
1888
1889 /* If this is a final link, then always put .gnu.warning.SYMBOL
1890 sections into the .text section to get them out of the way. */
1891 if (link_info.executable
1892 && ! link_info.relocatable
1893 && CONST_STRNEQ (s->name, ".gnu.warning.")
1894 && hold[orphan_text].os != NULL)
1895 {
1896 os = hold[orphan_text].os;
1897 lang_add_section (&os->children, s, NULL, os);
1898 return os;
1899 }
1900
1901 /* Decide which segment the section should go in based on the
1902 section name and section flags. We put loadable .note sections
1903 right after the .interp section, so that the PT_NOTE segment is
1904 stored right after the program headers where the OS can read it
1905 in the first page. */
1906
1907 place = NULL;
1908 if ((s->flags & (SEC_ALLOC | SEC_DEBUGGING)) == 0)
1909 place = &hold[orphan_nonalloc];
1910 else if ((s->flags & SEC_ALLOC) == 0)
1911 ;
1912 else if ((s->flags & SEC_LOAD) != 0
1913 && ((iself && sh_type == SHT_NOTE)
1914 || (!iself && CONST_STRNEQ (secname, ".note"))))
1915 place = &hold[orphan_interp];
1916 else if ((s->flags & (SEC_LOAD | SEC_HAS_CONTENTS | SEC_THREAD_LOCAL)) == 0)
1917 place = &hold[orphan_bss];
1918 else if ((s->flags & SEC_SMALL_DATA) != 0)
1919 place = &hold[orphan_sdata];
1920 else if ((s->flags & SEC_READONLY) == 0)
1921 place = &hold[orphan_data];
1922 else if (((iself && (sh_type == SHT_RELA || sh_type == SHT_REL))
1923 || (!iself && CONST_STRNEQ (secname, ".rel")))
1924 && (s->flags & SEC_LOAD) != 0)
1925 place = &hold[orphan_rel];
1926 else if ((s->flags & SEC_CODE) == 0)
1927 place = &hold[orphan_rodata];
1928 else
1929 place = &hold[orphan_text];
1930
1931 after = NULL;
1932 if (place != NULL)
1933 {
1934 if (place->os == NULL)
1935 {
1936 if (place->name != NULL)
1937 place->os = lang_output_section_find (place->name);
1938 else
1939 place->os = output_rel_find (s, isdyn);
1940 }
1941 after = place->os;
1942 if (after == NULL)
1943 after = lang_output_section_find_by_flags
1944 (s, &place->os, _bfd_elf_match_sections_by_type);
1945 if (after == NULL)
1946 /* *ABS* is always the first output section statement. */
1947 after = &lang_output_section_statement.head->output_section_statement;
1948 }
1949
1950 return lang_insert_orphan (s, secname, constraint, after, place, NULL, NULL);
1951 }
1952 EOF
1953 fi
1954
1955 if test x"$LDEMUL_AFTER_ALLOCATION" != xgld"$EMULATION_NAME"_after_allocation; then
1956 fragment <<EOF
1957
1958 static void
1959 gld${EMULATION_NAME}_after_allocation (void)
1960 {
1961 bfd_boolean need_layout = bfd_elf_discard_info (link_info.output_bfd,
1962 &link_info);
1963 gld${EMULATION_NAME}_map_segments (need_layout);
1964 }
1965 EOF
1966 fi
1967
1968 if test x"$LDEMUL_GET_SCRIPT" != xgld"$EMULATION_NAME"_get_script; then
1969 fragment <<EOF
1970
1971 static char *
1972 gld${EMULATION_NAME}_get_script (int *isfile)
1973 EOF
1974
1975 if test -n "$COMPILE_IN"
1976 then
1977 # Scripts compiled in.
1978
1979 # sed commands to quote an ld script as a C string.
1980 sc="-f stringify.sed"
1981
1982 fragment <<EOF
1983 {
1984 *isfile = 0;
1985
1986 if (link_info.relocatable && config.build_constructors)
1987 return
1988 EOF
1989 sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c
1990 echo ' ; else if (link_info.relocatable) return' >> e${EMULATION_NAME}.c
1991 sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c
1992 echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c
1993 sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c
1994 if cmp -s ldscripts/${EMULATION_NAME}.x ldscripts/${EMULATION_NAME}.xn; then : ; else
1995 echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
1996 sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c
1997 fi
1998 if test -n "$GENERATE_PIE_SCRIPT" ; then
1999 if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
2000 echo ' ; else if (link_info.pie && link_info.combreloc' >> e${EMULATION_NAME}.c
2001 echo ' && link_info.relro' >> e${EMULATION_NAME}.c
2002 echo ' && (link_info.flags & DF_BIND_NOW)) return' >> e${EMULATION_NAME}.c
2003 sed $sc ldscripts/${EMULATION_NAME}.xdw >> e${EMULATION_NAME}.c
2004 echo ' ; else if (link_info.pie && link_info.combreloc) return' >> e${EMULATION_NAME}.c
2005 sed $sc ldscripts/${EMULATION_NAME}.xdc >> e${EMULATION_NAME}.c
2006 fi
2007 echo ' ; else if (link_info.pie) return' >> e${EMULATION_NAME}.c
2008 sed $sc ldscripts/${EMULATION_NAME}.xd >> e${EMULATION_NAME}.c
2009 fi
2010 if test -n "$GENERATE_SHLIB_SCRIPT" ; then
2011 if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
2012 echo ' ; else if (link_info.shared && link_info.combreloc' >> e${EMULATION_NAME}.c
2013 echo ' && link_info.relro' >> e${EMULATION_NAME}.c
2014 echo ' && (link_info.flags & DF_BIND_NOW)) return' >> e${EMULATION_NAME}.c
2015 sed $sc ldscripts/${EMULATION_NAME}.xsw >> e${EMULATION_NAME}.c
2016 echo ' ; else if (link_info.shared && link_info.combreloc) return' >> e${EMULATION_NAME}.c
2017 sed $sc ldscripts/${EMULATION_NAME}.xsc >> e${EMULATION_NAME}.c
2018 fi
2019 echo ' ; else if (link_info.shared) return' >> e${EMULATION_NAME}.c
2020 sed $sc ldscripts/${EMULATION_NAME}.xs >> e${EMULATION_NAME}.c
2021 fi
2022 if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
2023 echo ' ; else if (link_info.combreloc && link_info.relro' >> e${EMULATION_NAME}.c
2024 echo ' && (link_info.flags & DF_BIND_NOW)) return' >> e${EMULATION_NAME}.c
2025 sed $sc ldscripts/${EMULATION_NAME}.xw >> e${EMULATION_NAME}.c
2026 echo ' ; else if (link_info.combreloc) return' >> e${EMULATION_NAME}.c
2027 sed $sc ldscripts/${EMULATION_NAME}.xc >> e${EMULATION_NAME}.c
2028 fi
2029 echo ' ; else return' >> e${EMULATION_NAME}.c
2030 sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c
2031 echo '; }' >> e${EMULATION_NAME}.c
2032
2033 else
2034 # Scripts read from the filesystem.
2035
2036 fragment <<EOF
2037 {
2038 *isfile = 1;
2039
2040 if (link_info.relocatable && config.build_constructors)
2041 return "ldscripts/${EMULATION_NAME}.xu";
2042 else if (link_info.relocatable)
2043 return "ldscripts/${EMULATION_NAME}.xr";
2044 else if (!config.text_read_only)
2045 return "ldscripts/${EMULATION_NAME}.xbn";
2046 EOF
2047 if cmp -s ldscripts/${EMULATION_NAME}.x ldscripts/${EMULATION_NAME}.xn; then :
2048 else
2049 fragment <<EOF
2050 else if (!config.magic_demand_paged)
2051 return "ldscripts/${EMULATION_NAME}.xn";
2052 EOF
2053 fi
2054 if test -n "$GENERATE_PIE_SCRIPT" ; then
2055 if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
2056 fragment <<EOF
2057 else if (link_info.pie && link_info.combreloc
2058 && link_info.relro && (link_info.flags & DF_BIND_NOW))
2059 return "ldscripts/${EMULATION_NAME}.xdw";
2060 else if (link_info.pie && link_info.combreloc)
2061 return "ldscripts/${EMULATION_NAME}.xdc";
2062 EOF
2063 fi
2064 fragment <<EOF
2065 else if (link_info.pie)
2066 return "ldscripts/${EMULATION_NAME}.xd";
2067 EOF
2068 fi
2069 if test -n "$GENERATE_SHLIB_SCRIPT" ; then
2070 if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
2071 fragment <<EOF
2072 else if (link_info.shared && link_info.combreloc
2073 && link_info.relro && (link_info.flags & DF_BIND_NOW))
2074 return "ldscripts/${EMULATION_NAME}.xsw";
2075 else if (link_info.shared && link_info.combreloc)
2076 return "ldscripts/${EMULATION_NAME}.xsc";
2077 EOF
2078 fi
2079 fragment <<EOF
2080 else if (link_info.shared)
2081 return "ldscripts/${EMULATION_NAME}.xs";
2082 EOF
2083 fi
2084 if test -n "$GENERATE_COMBRELOC_SCRIPT" ; then
2085 fragment <<EOF
2086 else if (link_info.combreloc && link_info.relro
2087 && (link_info.flags & DF_BIND_NOW))
2088 return "ldscripts/${EMULATION_NAME}.xw";
2089 else if (link_info.combreloc)
2090 return "ldscripts/${EMULATION_NAME}.xc";
2091 EOF
2092 fi
2093 fragment <<EOF
2094 else
2095 return "ldscripts/${EMULATION_NAME}.x";
2096 }
2097
2098 EOF
2099 fi
2100 fi
2101
2102 if test -n "$PARSE_AND_LIST_PROLOGUE" ; then
2103 fragment <<EOF
2104 $PARSE_AND_LIST_PROLOGUE
2105 EOF
2106 fi
2107
2108 fragment <<EOF
2109
2110 #define OPTION_DISABLE_NEW_DTAGS (400)
2111 #define OPTION_ENABLE_NEW_DTAGS (OPTION_DISABLE_NEW_DTAGS + 1)
2112 #define OPTION_GROUP (OPTION_ENABLE_NEW_DTAGS + 1)
2113 #define OPTION_EH_FRAME_HDR (OPTION_GROUP + 1)
2114 #define OPTION_EXCLUDE_LIBS (OPTION_EH_FRAME_HDR + 1)
2115 #define OPTION_HASH_STYLE (OPTION_EXCLUDE_LIBS + 1)
2116 #define OPTION_BUILD_ID (OPTION_HASH_STYLE + 1)
2117 #define OPTION_AUDIT (OPTION_BUILD_ID + 1)
2118
2119 static void
2120 gld${EMULATION_NAME}_add_options
2121 (int ns, char **shortopts, int nl, struct option **longopts,
2122 int nrl ATTRIBUTE_UNUSED, struct option **really_longopts ATTRIBUTE_UNUSED)
2123 {
2124 EOF
2125 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2126 fragment <<EOF
2127 static const char xtra_short[] = "${PARSE_AND_LIST_SHORTOPTS}z:P:";
2128 EOF
2129 else
2130 fragment <<EOF
2131 static const char xtra_short[] = "${PARSE_AND_LIST_SHORTOPTS}z:";
2132 EOF
2133 fi
2134 fragment <<EOF
2135 static const struct option xtra_long[] = {
2136 EOF
2137 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2138 fragment <<EOF
2139 {"audit", required_argument, NULL, OPTION_AUDIT},
2140 {"Bgroup", no_argument, NULL, OPTION_GROUP},
2141 EOF
2142 fi
2143 fragment <<EOF
2144 {"build-id", optional_argument, NULL, OPTION_BUILD_ID},
2145 EOF
2146 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2147 fragment <<EOF
2148 {"depaudit", required_argument, NULL, 'P'},
2149 {"disable-new-dtags", no_argument, NULL, OPTION_DISABLE_NEW_DTAGS},
2150 {"enable-new-dtags", no_argument, NULL, OPTION_ENABLE_NEW_DTAGS},
2151 {"eh-frame-hdr", no_argument, NULL, OPTION_EH_FRAME_HDR},
2152 {"exclude-libs", required_argument, NULL, OPTION_EXCLUDE_LIBS},
2153 {"hash-style", required_argument, NULL, OPTION_HASH_STYLE},
2154 EOF
2155 fi
2156 if test -n "$PARSE_AND_LIST_LONGOPTS" ; then
2157 fragment <<EOF
2158 $PARSE_AND_LIST_LONGOPTS
2159 EOF
2160 fi
2161 fragment <<EOF
2162 {NULL, no_argument, NULL, 0}
2163 };
2164
2165 *shortopts = (char *) xrealloc (*shortopts, ns + sizeof (xtra_short));
2166 memcpy (*shortopts + ns, &xtra_short, sizeof (xtra_short));
2167 *longopts = (struct option *)
2168 xrealloc (*longopts, nl * sizeof (struct option) + sizeof (xtra_long));
2169 memcpy (*longopts + nl, &xtra_long, sizeof (xtra_long));
2170 }
2171
2172 #define DEFAULT_BUILD_ID_STYLE "sha1"
2173
2174 static bfd_boolean
2175 gld${EMULATION_NAME}_handle_option (int optc)
2176 {
2177 switch (optc)
2178 {
2179 default:
2180 return FALSE;
2181
2182 case OPTION_BUILD_ID:
2183 if (emit_note_gnu_build_id != NULL)
2184 {
2185 free ((char *) emit_note_gnu_build_id);
2186 emit_note_gnu_build_id = NULL;
2187 }
2188 if (optarg == NULL)
2189 optarg = DEFAULT_BUILD_ID_STYLE;
2190 if (strcmp (optarg, "none"))
2191 emit_note_gnu_build_id = xstrdup (optarg);
2192 break;
2193
2194 EOF
2195
2196 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2197 fragment <<EOF
2198 case OPTION_AUDIT:
2199 gld${EMULATION_NAME}_append_to_separated_string (&audit, optarg);
2200 break;
2201
2202 case 'P':
2203 gld${EMULATION_NAME}_append_to_separated_string (&depaudit, optarg);
2204 break;
2205
2206 case OPTION_DISABLE_NEW_DTAGS:
2207 link_info.new_dtags = FALSE;
2208 break;
2209
2210 case OPTION_ENABLE_NEW_DTAGS:
2211 link_info.new_dtags = TRUE;
2212 break;
2213
2214 case OPTION_EH_FRAME_HDR:
2215 link_info.eh_frame_hdr = TRUE;
2216 break;
2217
2218 case OPTION_GROUP:
2219 link_info.flags_1 |= (bfd_vma) DF_1_GROUP;
2220 /* Groups must be self-contained. */
2221 link_info.unresolved_syms_in_objects = RM_GENERATE_ERROR;
2222 link_info.unresolved_syms_in_shared_libs = RM_GENERATE_ERROR;
2223 break;
2224
2225 case OPTION_EXCLUDE_LIBS:
2226 add_excluded_libs (optarg);
2227 break;
2228
2229 case OPTION_HASH_STYLE:
2230 link_info.emit_hash = FALSE;
2231 link_info.emit_gnu_hash = FALSE;
2232 if (strcmp (optarg, "sysv") == 0)
2233 link_info.emit_hash = TRUE;
2234 else if (strcmp (optarg, "gnu") == 0)
2235 link_info.emit_gnu_hash = TRUE;
2236 else if (strcmp (optarg, "both") == 0)
2237 {
2238 link_info.emit_hash = TRUE;
2239 link_info.emit_gnu_hash = TRUE;
2240 }
2241 else
2242 einfo (_("%P%F: invalid hash style \`%s'\n"), optarg);
2243 break;
2244
2245 EOF
2246 fi
2247 fragment <<EOF
2248 case 'z':
2249 if (strcmp (optarg, "defs") == 0)
2250 link_info.unresolved_syms_in_objects = RM_GENERATE_ERROR;
2251 else if (strcmp (optarg, "muldefs") == 0)
2252 link_info.allow_multiple_definition = TRUE;
2253 else if (CONST_STRNEQ (optarg, "max-page-size="))
2254 {
2255 char *end;
2256
2257 config.maxpagesize = strtoul (optarg + 14, &end, 0);
2258 if (*end || (config.maxpagesize & (config.maxpagesize - 1)) != 0)
2259 einfo (_("%P%F: invalid maxium page size \`%s'\n"),
2260 optarg + 14);
2261 }
2262 else if (CONST_STRNEQ (optarg, "common-page-size="))
2263 {
2264 char *end;
2265 config.commonpagesize = strtoul (optarg + 17, &end, 0);
2266 if (*end
2267 || (config.commonpagesize & (config.commonpagesize - 1)) != 0)
2268 einfo (_("%P%F: invalid common page size \`%s'\n"),
2269 optarg + 17);
2270 }
2271 else if (CONST_STRNEQ (optarg, "stack-size="))
2272 {
2273 char *end;
2274 link_info.stacksize = strtoul (optarg + 11, &end, 0);
2275 if (*end || link_info.stacksize < 0)
2276 einfo (_("%P%F: invalid stack size \`%s'\n"), optarg + 11);
2277 if (!link_info.stacksize)
2278 /* Use -1 for explicit no-stack, because zero means
2279 'default'. */
2280 link_info.stacksize = -1;
2281 }
2282 else if (strcmp (optarg, "execstack") == 0)
2283 {
2284 link_info.execstack = TRUE;
2285 link_info.noexecstack = FALSE;
2286 }
2287 else if (strcmp (optarg, "noexecstack") == 0)
2288 {
2289 link_info.noexecstack = TRUE;
2290 link_info.execstack = FALSE;
2291 }
2292 EOF
2293 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2294 fragment <<EOF
2295 else if (strcmp (optarg, "global") == 0)
2296 link_info.flags_1 |= (bfd_vma) DF_1_GLOBAL;
2297 else if (strcmp (optarg, "initfirst") == 0)
2298 link_info.flags_1 |= (bfd_vma) DF_1_INITFIRST;
2299 else if (strcmp (optarg, "interpose") == 0)
2300 link_info.flags_1 |= (bfd_vma) DF_1_INTERPOSE;
2301 else if (strcmp (optarg, "loadfltr") == 0)
2302 link_info.flags_1 |= (bfd_vma) DF_1_LOADFLTR;
2303 else if (strcmp (optarg, "nodefaultlib") == 0)
2304 link_info.flags_1 |= (bfd_vma) DF_1_NODEFLIB;
2305 else if (strcmp (optarg, "nodelete") == 0)
2306 link_info.flags_1 |= (bfd_vma) DF_1_NODELETE;
2307 else if (strcmp (optarg, "nodlopen") == 0)
2308 link_info.flags_1 |= (bfd_vma) DF_1_NOOPEN;
2309 else if (strcmp (optarg, "nodump") == 0)
2310 link_info.flags_1 |= (bfd_vma) DF_1_NODUMP;
2311 else if (strcmp (optarg, "now") == 0)
2312 {
2313 link_info.flags |= (bfd_vma) DF_BIND_NOW;
2314 link_info.flags_1 |= (bfd_vma) DF_1_NOW;
2315 }
2316 else if (strcmp (optarg, "lazy") == 0)
2317 {
2318 link_info.flags &= ~(bfd_vma) DF_BIND_NOW;
2319 link_info.flags_1 &= ~(bfd_vma) DF_1_NOW;
2320 }
2321 else if (strcmp (optarg, "origin") == 0)
2322 {
2323 link_info.flags |= (bfd_vma) DF_ORIGIN;
2324 link_info.flags_1 |= (bfd_vma) DF_1_ORIGIN;
2325 }
2326 else if (strcmp (optarg, "combreloc") == 0)
2327 link_info.combreloc = TRUE;
2328 else if (strcmp (optarg, "nocombreloc") == 0)
2329 link_info.combreloc = FALSE;
2330 else if (strcmp (optarg, "nocopyreloc") == 0)
2331 link_info.nocopyreloc = TRUE;
2332 else if (strcmp (optarg, "relro") == 0)
2333 link_info.relro = TRUE;
2334 else if (strcmp (optarg, "norelro") == 0)
2335 link_info.relro = FALSE;
2336 else if (strcmp (optarg, "text") == 0)
2337 link_info.error_textrel = TRUE;
2338 else if (strcmp (optarg, "notext") == 0)
2339 link_info.error_textrel = FALSE;
2340 else if (strcmp (optarg, "textoff") == 0)
2341 link_info.error_textrel = FALSE;
2342 EOF
2343 fi
2344
2345 fragment <<EOF
2346 else
2347 einfo (_("%P: warning: -z %s ignored.\n"), optarg);
2348 break;
2349 EOF
2350
2351 if test -n "$PARSE_AND_LIST_ARGS_CASES" ; then
2352 fragment <<EOF
2353 $PARSE_AND_LIST_ARGS_CASES
2354 EOF
2355 fi
2356
2357 fragment <<EOF
2358 }
2359
2360 return TRUE;
2361 }
2362
2363 EOF
2364
2365 if test x"$LDEMUL_LIST_OPTIONS" != xgld"$EMULATION_NAME"_list_options; then
2366 fragment <<EOF
2367
2368 static void
2369 gld${EMULATION_NAME}_list_options (FILE * file)
2370 {
2371 EOF
2372 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2373 fragment <<EOF
2374 fprintf (file, _("\
2375 --audit=AUDITLIB Specify a library to use for auditing\n"));
2376 fprintf (file, _("\
2377 -Bgroup Selects group name lookup rules for DSO\n"));
2378 EOF
2379 fi
2380 fragment <<EOF
2381 fprintf (file, _("\
2382 --build-id[=STYLE] Generate build ID note\n"));
2383 EOF
2384 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2385 fragment <<EOF
2386 fprintf (file, _("\
2387 -P AUDITLIB, --depaudit=AUDITLIB\n" "\
2388 Specify a library to use for auditing dependencies\n"));
2389 fprintf (file, _("\
2390 --disable-new-dtags Disable new dynamic tags\n"));
2391 fprintf (file, _("\
2392 --enable-new-dtags Enable new dynamic tags\n"));
2393 fprintf (file, _("\
2394 --eh-frame-hdr Create .eh_frame_hdr section\n"));
2395 fprintf (file, _("\
2396 --exclude-libs=LIBS Make all symbols in LIBS hidden\n"));
2397 fprintf (file, _("\
2398 --hash-style=STYLE Set hash style to sysv, gnu or both\n"));
2399 fprintf (file, _("\
2400 -z combreloc Merge dynamic relocs into one section and sort\n"));
2401 EOF
2402 fi
2403
2404 fragment <<EOF
2405 fprintf (file, _("\
2406 -z common-page-size=SIZE Set common page size to SIZE\n"));
2407 fprintf (file, _("\
2408 -z defs Report unresolved symbols in object files.\n"));
2409 fprintf (file, _("\
2410 -z execstack Mark executable as requiring executable stack\n"));
2411 EOF
2412
2413 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2414 fragment <<EOF
2415 fprintf (file, _("\
2416 -z global Make symbols in DSO available for subsequently\n\
2417 loaded objects\n"));
2418 fprintf (file, _("\
2419 -z initfirst Mark DSO to be initialized first at runtime\n"));
2420 fprintf (file, _("\
2421 -z interpose Mark object to interpose all DSOs but executable\n"));
2422 fprintf (file, _("\
2423 -z lazy Mark object lazy runtime binding (default)\n"));
2424 fprintf (file, _("\
2425 -z loadfltr Mark object requiring immediate process\n"));
2426 EOF
2427 fi
2428
2429 fragment <<EOF
2430 fprintf (file, _("\
2431 -z max-page-size=SIZE Set maximum page size to SIZE\n"));
2432 fprintf (file, _("\
2433 -z muldefs Allow multiple definitions\n"));
2434 EOF
2435
2436 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2437 fragment <<EOF
2438 fprintf (file, _("\
2439 -z nocombreloc Don't merge dynamic relocs into one section\n"));
2440 fprintf (file, _("\
2441 -z nocopyreloc Don't create copy relocs\n"));
2442 fprintf (file, _("\
2443 -z nodefaultlib Mark object not to use default search paths\n"));
2444 fprintf (file, _("\
2445 -z nodelete Mark DSO non-deletable at runtime\n"));
2446 fprintf (file, _("\
2447 -z nodlopen Mark DSO not available to dlopen\n"));
2448 fprintf (file, _("\
2449 -z nodump Mark DSO not available to dldump\n"));
2450 EOF
2451 fi
2452 fragment <<EOF
2453 fprintf (file, _("\
2454 -z noexecstack Mark executable as not requiring executable stack\n"));
2455 EOF
2456 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
2457 fragment <<EOF
2458 fprintf (file, _("\
2459 -z norelro Don't create RELRO program header\n"));
2460 fprintf (file, _("\
2461 -z now Mark object non-lazy runtime binding\n"));
2462 fprintf (file, _("\
2463 -z origin Mark object requiring immediate \$ORIGIN\n\
2464 processing at runtime\n"));
2465 fprintf (file, _("\
2466 -z relro Create RELRO program header\n"));
2467 fprintf (file, _("\
2468 -z stacksize=SIZE Set size of stack segment\n"));
2469 EOF
2470 fi
2471
2472 if test -n "$PARSE_AND_LIST_OPTIONS" ; then
2473 fragment <<EOF
2474 $PARSE_AND_LIST_OPTIONS
2475 EOF
2476 fi
2477
2478 fragment <<EOF
2479 }
2480 EOF
2481
2482 if test -n "$PARSE_AND_LIST_EPILOGUE" ; then
2483 fragment <<EOF
2484 $PARSE_AND_LIST_EPILOGUE
2485 EOF
2486 fi
2487 fi
2488
2489 fragment <<EOF
2490
2491 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
2492 {
2493 ${LDEMUL_BEFORE_PARSE-gld${EMULATION_NAME}_before_parse},
2494 ${LDEMUL_SYSLIB-syslib_default},
2495 ${LDEMUL_HLL-hll_default},
2496 ${LDEMUL_AFTER_PARSE-after_parse_default},
2497 ${LDEMUL_AFTER_OPEN-gld${EMULATION_NAME}_after_open},
2498 ${LDEMUL_AFTER_ALLOCATION-gld${EMULATION_NAME}_after_allocation},
2499 ${LDEMUL_SET_OUTPUT_ARCH-set_output_arch_default},
2500 ${LDEMUL_CHOOSE_TARGET-ldemul_default_target},
2501 ${LDEMUL_BEFORE_ALLOCATION-gld${EMULATION_NAME}_before_allocation},
2502 ${LDEMUL_GET_SCRIPT-gld${EMULATION_NAME}_get_script},
2503 "${EMULATION_NAME}",
2504 "${OUTPUT_FORMAT}",
2505 ${LDEMUL_FINISH-finish_default},
2506 ${LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS-NULL},
2507 ${LDEMUL_OPEN_DYNAMIC_ARCHIVE-gld${EMULATION_NAME}_open_dynamic_archive},
2508 ${LDEMUL_PLACE_ORPHAN-gld${EMULATION_NAME}_place_orphan},
2509 ${LDEMUL_SET_SYMBOLS-NULL},
2510 ${LDEMUL_PARSE_ARGS-NULL},
2511 gld${EMULATION_NAME}_add_options,
2512 gld${EMULATION_NAME}_handle_option,
2513 ${LDEMUL_UNRECOGNIZED_FILE-NULL},
2514 ${LDEMUL_LIST_OPTIONS-gld${EMULATION_NAME}_list_options},
2515 ${LDEMUL_RECOGNIZED_FILE-gld${EMULATION_NAME}_load_symbols},
2516 ${LDEMUL_FIND_POTENTIAL_LIBRARIES-NULL},
2517 ${LDEMUL_NEW_VERS_PATTERN-NULL}
2518 };
2519 EOF