1 # This shell script emits a C file. -*- C -*-
2 # It does some substitutions.
4 cat >e${EMULATION_NAME}.c <<EOF
5 /* This file is is generated by a shell script. DO NOT EDIT! */
7 /* emulate the original gld for the given ${EMULATION_NAME}
8 Copyright (C) 1991, 93, 96, 97, 98, 99, 2000
9 Free Software Foundation, Inc.
10 Written by Steve Chamberlain steve@cygnus.com
12 This file is part of GLD, the Gnu Linker.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 2 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 #define TARGET_IS_${EMULATION_NAME}
48 static boolean gld${EMULATION_NAME}_open_dynamic_archive
49 PARAMS ((const char *, search_dirs_type *, lang_input_statement_type *));
50 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
51 static void gld${EMULATION_NAME}_check_needed
52 PARAMS ((lang_input_statement_type *));
53 static void gld${EMULATION_NAME}_stat_needed
54 PARAMS ((lang_input_statement_type *));
55 static boolean gld${EMULATION_NAME}_search_needed
56 PARAMS ((const char *, const char *, int));
57 static boolean gld${EMULATION_NAME}_try_needed PARAMS ((const char *, int));
58 static void gld${EMULATION_NAME}_vercheck
59 PARAMS ((lang_input_statement_type *));
60 static void gld${EMULATION_NAME}_find_statement_assignment
61 PARAMS ((lang_statement_union_type *));
62 static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
63 static boolean gld${EMULATION_NAME}_place_orphan
64 PARAMS ((lang_input_statement_type *, asection *));
65 static lang_output_section_statement_type *output_rel_find PARAMS ((void));
66 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
67 static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
68 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
69 static int gld${EMULATION_NAME}_parse_args PARAMS((int, char **));
70 static void gld${EMULATION_NAME}_list_options PARAMS ((FILE *));
71 static void gld${EMULATION_NAME}_finish PARAMS ((void));
74 static int no_pipeline_knowledge = 0;
75 static char * thumb_entry_symbol = NULL;
77 #define OPTION_THUMB_ENTRY 301
79 static struct option longopts[] =
81 { "no-pipeline-knowledge", no_argument, NULL, 'p'},
82 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
83 { NULL, no_argument, NULL, 0 }
87 gld${EMULATION_NAME}_list_options (file)
90 fprintf (file, _(" -p --no-pipeline-knowledge Stop the linker knowing about the pipeline length\n"));
91 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
95 gld${EMULATION_NAME}_parse_args (argc, argv)
101 int prevoptind = optind;
102 int prevopterr = opterr;
104 static int lastoptind = -1;
106 if (lastoptind != optind)
112 optc = getopt_long_only (argc, argv, "-p", longopts, & longind);
124 no_pipeline_knowledge = 1;
127 case OPTION_THUMB_ENTRY:
128 thumb_entry_symbol = optarg;
137 gld${EMULATION_NAME}_before_parse ()
139 #ifndef TARGET_ /* I.e., if not generic. */
140 ldfile_set_output_arch ("`echo ${ARCH}`");
141 #endif /* not TARGET_ */
142 config.dynamic_link = ${DYNAMIC_LINK-true};
143 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo true ; else echo false ; fi`;
146 /* Try to open a dynamic archive. This is where we know that ELF
147 dynamic libraries have an extension of .so. */
150 gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry)
152 search_dirs_type *search;
153 lang_input_statement_type *entry;
155 const char *filename;
158 if (! entry->is_archive)
161 filename = entry->filename;
163 string = (char *) xmalloc (strlen (search->name)
168 sprintf (string, "%s/lib%s%s.so", search->name, filename, arch);
170 if (! ldfile_try_open_bfd (string, entry))
176 entry->filename = string;
178 /* We have found a dynamic object to include in the link. The ELF
179 backend linker will create a DT_NEEDED entry in the .dynamic
180 section naming this file. If this file includes a DT_SONAME
181 entry, it will be used. Otherwise, the ELF linker will just use
182 the name of the file. For an archive found by searching, like
183 this one, the DT_NEEDED entry should consist of just the name of
184 the file, without the path information used to find it. Note
185 that we only need to do this if we have a dynamic object; an
186 archive will never be referenced by a DT_NEEDED entry.
188 FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
189 very pretty. I haven't been able to think of anything that is
191 if (bfd_check_format (entry->the_bfd, bfd_object)
192 && (entry->the_bfd->flags & DYNAMIC) != 0)
196 ASSERT (entry->is_archive && entry->search_dirs_flag);
197 needed_name = (char *) xmalloc (strlen (filename)
200 sprintf (needed_name, "lib%s%s.so", filename, arch);
201 bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name);
208 if [ "x${host}" = "x${target}" ] ; then
209 case " ${EMULATION_LIBPATH} " in
210 *" ${EMULATION_NAME} "*)
211 cat >>e${EMULATION_NAME}.c <<EOF
213 /* For a native linker, check the file /etc/ld.so.conf for directories
214 in which we may find shared libraries. /etc/ld.so.conf is really
215 only meaningful on Linux, but we check it on other systems anyhow. */
217 static boolean gld${EMULATION_NAME}_check_ld_so_conf
218 PARAMS ((const char *, int));
221 gld${EMULATION_NAME}_check_ld_so_conf (name, force)
225 static boolean initialized;
226 static char *ld_so_conf;
232 f = fopen ("/etc/ld.so.conf", FOPEN_RT);
241 b = (char *) xmalloc (alloc);
243 while ((c = getc (f)) != EOF)
245 if (len + 1 >= alloc)
248 b = (char *) xrealloc (b, alloc);
261 if (len > 0 && b[len - 1] != ':')
269 if (len > 0 && b[len - 1] == ':')
288 if (ld_so_conf == NULL)
291 return gld${EMULATION_NAME}_search_needed (ld_so_conf, name, force);
298 cat >>e${EMULATION_NAME}.c <<EOF
300 /* These variables are required to pass information back and forth
301 between after_open and check_needed and stat_needed and vercheck. */
303 static struct bfd_link_needed_list *global_needed;
304 static struct stat global_stat;
305 static boolean global_found;
306 static struct bfd_link_needed_list *global_vercheck_needed;
307 static boolean global_vercheck_failed;
310 gld${EMULATION_NAME}_after_open ()
312 struct bfd_link_needed_list *needed, *l;
314 if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
316 /* The arm backend needs special fields in the output hash structure.
317 These will only be created if the output format is an arm format,
318 hence we do not support linking and changing output formats at the
319 same time. Use a link followed by objcopy to change output formats. */
320 einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
325 LANG_FOR_EACH_INPUT_STATEMENT (is)
327 /* The interworking bfd must be the last one to be processed */
329 bfd_elf32_arm_get_bfd_for_interworking (is->the_bfd, & link_info);
333 /* We only need to worry about this when doing a final link. */
334 if (link_info.relocateable || link_info.shared)
337 /* Get the list of files which appear in DT_NEEDED entries in
338 dynamic objects included in the link (often there will be none).
339 For each such file, we want to track down the corresponding
340 library, and include the symbol table in the link. This is what
341 the runtime dynamic linker will do. Tracking the files down here
342 permits one dynamic object to include another without requiring
343 special action by the person doing the link. Note that the
344 needed list can actually grow while we are stepping through this
346 needed = bfd_elf_get_needed_list (output_bfd, &link_info);
347 for (l = needed; l != NULL; l = l->next)
349 struct bfd_link_needed_list *ll;
352 /* If we've already seen this file, skip it. */
353 for (ll = needed; ll != l; ll = ll->next)
354 if (strcmp (ll->name, l->name) == 0)
359 /* See if this file was included in the link explicitly. */
361 global_found = false;
362 lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
366 /* We need to find this file and include the symbol table. We
367 want to search for the file in the same way that the dynamic
368 linker will search. That means that we want to use
369 rpath_link, rpath, then the environment variable
370 LD_LIBRARY_PATH (native only), then the linker script
371 LIB_SEARCH_DIRS. We do not search using the -L arguments.
373 We search twice. The first time, we skip objects which may
374 introduce version mismatches. The second time, we force
375 their use. See gld${EMULATION_NAME}_vercheck comment. */
376 for (force = 0; force < 2; force++)
378 const char *lib_path;
380 search_dirs_type *search;
382 if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
385 if (gld${EMULATION_NAME}_search_needed (command_line.rpath,
388 if (command_line.rpath_link == NULL
389 && command_line.rpath == NULL)
391 lib_path = (const char *) getenv ("LD_RUN_PATH");
392 if (gld${EMULATION_NAME}_search_needed (lib_path, l->name,
397 if [ "x${host}" = "x${target}" ] ; then
398 case " ${EMULATION_LIBPATH} " in
399 *" ${EMULATION_NAME} "*)
400 cat >>e${EMULATION_NAME}.c <<EOF
401 lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
402 if (gld${EMULATION_NAME}_search_needed (lib_path, l->name, force))
408 cat >>e${EMULATION_NAME}.c <<EOF
409 len = strlen (l->name);
410 for (search = search_head; search != NULL; search = search->next)
416 filename = (char *) xmalloc (strlen (search->name) + len + 2);
417 sprintf (filename, "%s/%s", search->name, l->name);
418 if (gld${EMULATION_NAME}_try_needed (filename, force))
425 if [ "x${host}" = "x${target}" ] ; then
426 case " ${EMULATION_LIBPATH} " in
427 *" ${EMULATION_NAME} "*)
428 cat >>e${EMULATION_NAME}.c <<EOF
429 if (gld${EMULATION_NAME}_check_ld_so_conf (l->name, force))
435 cat >>e${EMULATION_NAME}.c <<EOF
441 einfo ("%P: warning: %s, needed by %B, not found (try using --rpath)\n",
446 /* Search for a needed file in a path. */
449 gld${EMULATION_NAME}_search_needed (path, name, force)
457 if (path == NULL || *path == '\0')
462 char *filename, *sset;
464 s = strchr (path, ':');
466 s = path + strlen (path);
468 filename = (char *) xmalloc (s - path + len + 2);
473 memcpy (filename, path, s - path);
474 filename[s - path] = '/';
475 sset = filename + (s - path) + 1;
479 if (gld${EMULATION_NAME}_try_needed (filename, force))
492 /* This function is called for each possible name for a dynamic object
493 named by a DT_NEEDED entry. The FORCE parameter indicates whether
494 to skip the check for a conflicting version. */
497 gld${EMULATION_NAME}_try_needed (name, force)
503 abfd = bfd_openr (name, bfd_get_target (output_bfd));
506 if (! bfd_check_format (abfd, bfd_object))
508 (void) bfd_close (abfd);
511 if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
513 (void) bfd_close (abfd);
517 /* Check whether this object would include any conflicting library
518 versions. If FORCE is set, then we skip this check; we use this
519 the second time around, if we couldn't find any compatible
520 instance of the shared library. */
524 struct bfd_link_needed_list *needed;
526 if (! bfd_elf_get_bfd_needed_list (abfd, &needed))
527 einfo ("%F%P:%B: bfd_elf_get_bfd_needed_list failed: %E\n", abfd);
531 global_vercheck_needed = needed;
532 global_vercheck_failed = false;
533 lang_for_each_input_file (gld${EMULATION_NAME}_vercheck);
534 if (global_vercheck_failed)
536 (void) bfd_close (abfd);
537 /* Return false to force the caller to move on to try
538 another file on the search path. */
542 /* But wait! It gets much worse. On Linux, if a shared
543 library does not use libc at all, we are supposed to skip
544 it the first time around in case we encounter a shared
545 library later on with the same name which does use the
546 version of libc that we want. This is much too horrible
547 to use on any system other than Linux. */
552 cat >>e${EMULATION_NAME}.c <<EOF
554 struct bfd_link_needed_list *l;
556 for (l = needed; l != NULL; l = l->next)
557 if (strncmp (l->name, "libc.so", 7) == 0)
561 (void) bfd_close (abfd);
569 cat >>e${EMULATION_NAME}.c <<EOF
573 /* We've found a dynamic object matching the DT_NEEDED entry. */
575 /* We have already checked that there is no other input file of the
576 same name. We must now check again that we are not including the
577 same file twice. We need to do this because on many systems
578 libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will
579 reference libc.so.1. If we have already included libc.so, we
580 don't want to include libc.so.1 if they are the same file, and we
581 can only check that using stat. */
583 if (bfd_stat (abfd, &global_stat) != 0)
584 einfo ("%F%P:%B: bfd_stat failed: %E\n", abfd);
585 global_found = false;
586 lang_for_each_input_file (gld${EMULATION_NAME}_stat_needed);
589 /* Return true to indicate that we found the file, even though
590 we aren't going to do anything with it. */
594 /* Tell the ELF backend that don't want the output file to have a
595 DT_NEEDED entry for this file. */
596 bfd_elf_set_dt_needed_name (abfd, "");
598 /* Add this file into the symbol table. */
599 if (! bfd_link_add_symbols (abfd, &link_info))
600 einfo ("%F%B: could not read symbols: %E\n", abfd);
605 /* See if an input file matches a DT_NEEDED entry by name. */
608 gld${EMULATION_NAME}_check_needed (s)
609 lang_input_statement_type *s;
614 if (s->filename != NULL
615 && strcmp (s->filename, global_needed->name) == 0)
621 if (s->the_bfd != NULL)
625 soname = bfd_elf_get_dt_soname (s->the_bfd);
627 && strcmp (soname, global_needed->name) == 0)
634 if (s->search_dirs_flag
635 && s->filename != NULL
636 && strchr (global_needed->name, '/') == NULL)
640 f = strrchr (s->filename, '/');
642 && strcmp (f + 1, global_needed->name) == 0)
650 /* See if an input file matches a DT_NEEDED entry by running stat on
654 gld${EMULATION_NAME}_stat_needed (s)
655 lang_input_statement_type *s;
664 if (s->the_bfd == NULL)
667 if (bfd_stat (s->the_bfd, &st) != 0)
669 einfo ("%P:%B: bfd_stat failed: %E\n", s->the_bfd);
673 if (st.st_dev == global_stat.st_dev
674 && st.st_ino == global_stat.st_ino)
680 /* We issue a warning if it looks like we are including two
681 different versions of the same shared library. For example,
682 there may be a problem if -lc picks up libc.so.6 but some other
683 shared library has a DT_NEEDED entry of libc.so.5. This is a
684 hueristic test, and it will only work if the name looks like
685 NAME.so.VERSION. FIXME: Depending on file names is error-prone.
686 If we really want to issue warnings about mixing version numbers
687 of shared libraries, we need to find a better way. */
689 if (strchr (global_needed->name, '/') != NULL)
691 suffix = strstr (global_needed->name, ".so.");
694 suffix += sizeof ".so." - 1;
696 soname = bfd_elf_get_dt_soname (s->the_bfd);
698 soname = s->filename;
700 f = strrchr (soname, '/');
706 if (strncmp (f, global_needed->name, suffix - global_needed->name) == 0)
707 einfo ("%P: warning: %s, needed by %B, may conflict with %s\n",
708 global_needed->name, global_needed->by, f);
711 /* On Linux, it's possible to have different versions of the same
712 shared library linked against different versions of libc. The
713 dynamic linker somehow tags which libc version to use in
714 /etc/ld.so.cache, and, based on the libc that it sees in the
715 executable, chooses which version of the shared library to use.
717 We try to do a similar check here by checking whether this shared
718 library needs any other shared libraries which may conflict with
719 libraries we have already included in the link. If it does, we
720 skip it, and try to find another shared library farther on down the
723 This is called via lang_for_each_input_file.
724 GLOBAL_VERCHECK_NEEDED is the list of objects needed by the object
725 which we ar checking. This sets GLOBAL_VERCHECK_FAILED if we find
726 a conflicting version. */
729 gld${EMULATION_NAME}_vercheck (s)
730 lang_input_statement_type *s;
732 const char *soname, *f;
733 struct bfd_link_needed_list *l;
735 if (global_vercheck_failed)
737 if (s->the_bfd == NULL
738 || (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0)
741 soname = bfd_elf_get_dt_soname (s->the_bfd);
743 soname = bfd_get_filename (s->the_bfd);
745 f = strrchr (soname, '/');
751 for (l = global_vercheck_needed; l != NULL; l = l->next)
755 if (strcmp (f, l->name) == 0)
757 /* Probably can't happen, but it's an easy check. */
761 if (strchr (l->name, '/') != NULL)
764 suffix = strstr (l->name, ".so.");
768 suffix += sizeof ".so." - 1;
770 if (strncmp (f, l->name, suffix - l->name) == 0)
772 /* Here we know that S is a dynamic object FOO.SO.VER1, and
773 the object we are considering needs a dynamic object
774 FOO.SO.VER2, and VER1 and VER2 are different. This
775 appears to be a version mismatch, so we tell the caller
776 to try a different version of this library. */
777 global_vercheck_failed = true;
783 /* Place an orphan section. We use this to put random SHF_ALLOC
784 sections in the right segment. */
788 lang_output_section_statement_type *os;
790 lang_statement_union_type **stmt;
795 gld${EMULATION_NAME}_place_orphan (file, s)
796 lang_input_statement_type *file;
799 static struct orphan_save hold_text;
800 static struct orphan_save hold_rodata;
801 static struct orphan_save hold_data;
802 static struct orphan_save hold_bss;
803 static struct orphan_save hold_rel;
804 static struct orphan_save hold_interp;
805 struct orphan_save *place;
806 lang_statement_list_type *old;
807 lang_statement_list_type add;
809 const char *secname, *ps;
810 const char *outsecname;
811 lang_output_section_statement_type *os;
813 secname = bfd_get_section_name (s->owner, s);
815 /* Look through the script to see where to place this section. */
816 os = lang_output_section_find (secname);
819 && os->bfd_section != NULL
820 && ((s->flags ^ os->bfd_section->flags) & (SEC_LOAD | SEC_ALLOC)) == 0)
822 /* We have already placed a section with this name. */
823 wild_doit (&os->children, s, os, file);
827 if (hold_text.os == NULL)
828 hold_text.os = lang_output_section_find (".text");
830 /* If this is a final link, then always put .gnu.warning.SYMBOL
831 sections into the .text section to get them out of the way. */
832 if (! link_info.shared
833 && ! link_info.relocateable
834 && strncmp (secname, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0
835 && hold_text.os != NULL)
837 wild_doit (&hold_text.os->children, s, hold_text.os, file);
841 /* Decide which segment the section should go in based on the
842 section name and section flags. We put loadable .note sections
843 right after the .interp section, so that the PT_NOTE segment is
844 stored right after the program headers where the OS can read it
845 in the first page. */
846 #define HAVE_SECTION(hold, name) \
847 (hold.os != NULL || (hold.os = lang_output_section_find (name)) != NULL)
849 if (s->flags & SEC_EXCLUDE)
851 else if ((s->flags & SEC_ALLOC) == 0)
853 else if ((s->flags & SEC_LOAD) != 0
854 && strncmp (secname, ".note", 4) == 0
855 && HAVE_SECTION (hold_interp, ".interp"))
856 place = &hold_interp;
857 else if ((s->flags & SEC_HAS_CONTENTS) == 0
858 && HAVE_SECTION (hold_bss, ".bss"))
860 else if ((s->flags & SEC_READONLY) == 0
861 && HAVE_SECTION (hold_data, ".data"))
863 else if (strncmp (secname, ".rel", 4) == 0
864 && (hold_rel.os != NULL
865 || (hold_rel.os = output_rel_find ()) != NULL))
867 else if ((s->flags & SEC_CODE) == 0
868 && (s->flags & SEC_READONLY) != 0
869 && HAVE_SECTION (hold_rodata, ".rodata"))
870 place = &hold_rodata;
871 else if ((s->flags & SEC_READONLY) != 0
872 && hold_text.os != NULL)
879 /* Choose a unique name for the section. This will be needed if the
880 same section name appears in the input file with different
881 loadable or allocateable characteristics. */
882 outsecname = secname;
883 if (bfd_get_section_by_name (output_bfd, outsecname) != NULL)
889 len = strlen (outsecname);
890 newname = xmalloc (len + 5);
891 strcpy (newname, outsecname);
895 sprintf (newname + len, "%d", i);
898 while (bfd_get_section_by_name (output_bfd, newname) != NULL);
900 outsecname = newname;
905 /* Start building a list of statements for this section. */
908 lang_list_init (stat_ptr);
910 /* If the name of the section is representable in C, then create
911 symbols to mark the start and the end of the section. */
912 for (ps = outsecname; *ps != '\0'; ps++)
913 if (! isalnum ((unsigned char) *ps) && *ps != '_')
915 if (*ps == '\0' && config.build_constructors)
920 symname = (char *) xmalloc (ps - outsecname + sizeof "__start_");
921 sprintf (symname, "__start_%s", outsecname);
922 e_align = exp_unop (ALIGN_K,
923 exp_intop ((bfd_vma) 1 << s->alignment_power));
924 lang_add_assignment (exp_assop ('=', symname, e_align));
928 if (link_info.relocateable || (s->flags & (SEC_LOAD | SEC_ALLOC)) == 0)
929 address = exp_intop ((bfd_vma) 0);
933 os = lang_enter_output_section_statement (outsecname, address, 0,
937 (etree_type *) NULL);
939 wild_doit (&os->children, s, os, file);
941 lang_leave_output_section_statement
942 ((bfd_vma) 0, "*default*",
943 (struct lang_output_section_phdr_list *) NULL, "*default*");
947 asection *snew, **pps;
951 if (*ps == '\0' && config.build_constructors)
955 symname = (char *) xmalloc (ps - outsecname + sizeof "__stop_");
956 sprintf (symname, "__stop_%s", outsecname);
957 lang_add_assignment (exp_assop ('=', symname,
958 exp_nameop (NAME, ".")));
962 snew = os->bfd_section;
963 if (place->os->bfd_section != NULL || place->section != NULL)
965 /* Shuffle the section to make the output file look neater. */
966 if (place->section == NULL)
969 /* Finding the end of the list is a little tricky. We
970 make a wild stab at it by comparing section flags. */
971 flagword first_flags = place->os->bfd_section->flags;
972 for (pps = &place->os->bfd_section->next;
973 *pps != NULL && (*pps)->flags == first_flags;
976 place->section = pps;
978 /* Put orphans after the first section on the list. */
979 place->section = &place->os->bfd_section->next;
983 /* Unlink the section. */
984 for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
988 /* Now tack it on to the "place->os" section list. */
989 snew->next = *place->section;
990 *place->section = snew;
992 place->section = &snew->next; /* Save the end of this list. */
994 if (place->stmt == NULL)
996 /* Put the new statement list right at the head. */
997 *add.tail = place->os->header.next;
998 place->os->header.next = add.head;
1002 /* Put it after the last orphan statement we added. */
1003 *add.tail = *place->stmt;
1004 *place->stmt = add.head;
1006 place->stmt = add.tail; /* Save the end of this list. */
1012 /* A variant of lang_output_section_find. */
1013 static lang_output_section_statement_type *
1016 lang_statement_union_type *u;
1017 lang_output_section_statement_type *lookup;
1019 for (u = lang_output_section_statement.head;
1020 u != (lang_statement_union_type *) NULL;
1023 lookup = &u->output_section_statement;
1024 if (strncmp (".rel", lookup->name, 4) == 0
1025 && lookup->bfd_section != NULL
1026 && (lookup->bfd_section->flags & SEC_ALLOC) != 0)
1031 return (lang_output_section_statement_type *) NULL;
1034 /* Look through an expression for an assignment statement. */
1037 gld${EMULATION_NAME}_find_exp_assignment (exp)
1040 struct bfd_link_hash_entry *h;
1042 switch (exp->type.node_class)
1045 h = bfd_link_hash_lookup (link_info.hash, exp->assign.dst,
1046 false, false, false);
1050 /* We call record_link_assignment even if the symbol is defined.
1051 This is because if it is defined by a dynamic object, we
1052 actually want to use the value defined by the linker script,
1053 not the value from the dynamic object (because we are setting
1054 symbols like etext). If the symbol is defined by a regular
1055 object, then, as it happens, calling record_link_assignment
1060 if (strcmp (exp->assign.dst, ".") != 0)
1062 if (! (bfd_elf${ELFSIZE}_record_link_assignment
1063 (output_bfd, &link_info, exp->assign.dst,
1064 exp->type.node_class == etree_provide ? true : false)))
1065 einfo ("%P%F: failed to record assignment to %s: %E\n",
1068 gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
1072 gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
1073 gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
1077 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
1078 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
1079 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
1083 gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
1091 /* This is called by the before_allocation routine via
1092 lang_for_each_statement. It locates any assignment statements, and
1093 tells the ELF backend about them, in case they are assignments to
1094 symbols which are referred to by dynamic objects. */
1097 gld${EMULATION_NAME}_find_statement_assignment (s)
1098 lang_statement_union_type *s;
1100 if (s->header.type == lang_assignment_statement_enum)
1101 gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
1104 /* This is called after the sections have been attached to output
1105 sections, but before any sizes or addresses have been set. */
1108 gld${EMULATION_NAME}_before_allocation ()
1113 /* If we are going to make any variable assignments, we need to let
1114 the ELF backend know about them in case the variables are
1115 referred to by dynamic objects. */
1116 lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);
1118 /* Let the ELF backend work out the sizes of any sections required
1119 by dynamic linking. */
1120 rpath = command_line.rpath;
1122 rpath = (const char *) getenv ("LD_RUN_PATH");
1123 if (! (bfd_elf${ELFSIZE}_size_dynamic_sections
1124 (output_bfd, command_line.soname, rpath,
1125 command_line.export_dynamic, command_line.filter_shlib,
1126 (const char * const *) command_line.auxiliary_filters,
1127 &link_info, &sinterp, lang_elf_version_info)))
1128 einfo ("%P%F: failed to set dynamic section sizes: %E\n");
1130 /* Let the user override the dynamic linker we are using. */
1131 if (command_line.interpreter != NULL
1134 sinterp->contents = (bfd_byte *) command_line.interpreter;
1135 sinterp->_raw_size = strlen (command_line.interpreter) + 1;
1138 /* Look for any sections named .gnu.warning. As a GNU extensions,
1139 we treat such sections as containing warning messages. We print
1140 out the warning message, and then zero out the section size so
1141 that it does not get copied into the output file. */
1144 LANG_FOR_EACH_INPUT_STATEMENT (is)
1151 if (is->just_syms_flag)
1154 s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
1158 sz = bfd_section_size (is->the_bfd, s);
1159 msg = xmalloc ((size_t) sz + 1);
1160 if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz))
1161 einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n",
1164 ret = link_info.callbacks->warning (&link_info, msg,
1165 (const char *) NULL,
1166 is->the_bfd, (asection *) NULL,
1171 /* Clobber the section size, so that we don't waste copying the
1172 warning into the output file. */
1177 /* we should be able to set the size of the interworking stub section */
1179 /* Here we rummage through the found bfds to collect glue information */
1180 /* FIXME: should this be based on a command line option? krk@cygnus.com */
1182 LANG_FOR_EACH_INPUT_STATEMENT (is)
1184 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
1185 no_pipeline_knowledge))
1187 /* xgettext:c-format */
1188 einfo (_("Errors encountered processing file %s"), is->filename);
1193 /* We have seen it all. Allocate it, and carry on */
1194 bfd_elf32_arm_allocate_interworking_sections (& link_info);
1198 gld${EMULATION_NAME}_finish PARAMS((void))
1200 struct bfd_link_hash_entry * h;
1202 if (thumb_entry_symbol == NULL)
1205 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol, false, false, true);
1207 if (h != (struct bfd_link_hash_entry *) NULL
1208 && (h->type == bfd_link_hash_defined
1209 || h->type == bfd_link_hash_defweak)
1210 && h->u.def.section->output_section != NULL)
1212 static char buffer[32];
1215 /* Special procesing is required for a Thumb entry symbol. The
1216 bottom bit of its address must be set. */
1217 val = (h->u.def.value
1218 + bfd_get_section_vma (output_bfd,
1219 h->u.def.section->output_section)
1220 + h->u.def.section->output_offset);
1224 /* Now convert this value into a string and store it in entry_symbol
1225 where the lang_finish() function will pick it up. */
1229 sprintf_vma (buffer + 2, val);
1231 if (entry_symbol != NULL && entry_from_cmdline)
1232 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
1233 thumb_entry_symbol, entry_symbol);
1234 entry_symbol = buffer;
1237 einfo (_("%P: warning: connot find thumb start symbol %s\n"), thumb_entry_symbol);
1241 gld${EMULATION_NAME}_get_script (isfile)
1245 if test -n "$COMPILE_IN"
1247 # Scripts compiled in.
1249 # sed commands to quote an ld script as a C string.
1250 sc="-f stringify.sed"
1252 cat >>e${EMULATION_NAME}.c <<EOF
1256 if (link_info.relocateable == true && config.build_constructors == true)
1259 sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c
1260 echo ' ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
1261 sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c
1262 echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c
1263 sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c
1264 echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
1265 sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c
1266 if test -n "$GENERATE_SHLIB_SCRIPT" ; then
1267 echo ' ; else if (link_info.shared) return' >> e${EMULATION_NAME}.c
1268 sed $sc ldscripts/${EMULATION_NAME}.xs >> e${EMULATION_NAME}.c
1270 echo ' ; else return' >> e${EMULATION_NAME}.c
1271 sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c
1272 echo '; }' >> e${EMULATION_NAME}.c
1275 # Scripts read from the filesystem.
1277 cat >>e${EMULATION_NAME}.c <<EOF
1281 if (link_info.relocateable == true && config.build_constructors == true)
1282 return "ldscripts/${EMULATION_NAME}.xu";
1283 else if (link_info.relocateable == true)
1284 return "ldscripts/${EMULATION_NAME}.xr";
1285 else if (!config.text_read_only)
1286 return "ldscripts/${EMULATION_NAME}.xbn";
1287 else if (!config.magic_demand_paged)
1288 return "ldscripts/${EMULATION_NAME}.xn";
1289 else if (link_info.shared)
1290 return "ldscripts/${EMULATION_NAME}.xs";
1292 return "ldscripts/${EMULATION_NAME}.x";
1298 cat >>e${EMULATION_NAME}.c <<EOF
1300 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
1302 gld${EMULATION_NAME}_before_parse,
1305 after_parse_default,
1306 gld${EMULATION_NAME}_after_open,
1307 after_allocation_default,
1308 set_output_arch_default,
1309 ldemul_default_target,
1310 gld${EMULATION_NAME}_before_allocation,
1311 gld${EMULATION_NAME}_get_script,
1312 "${EMULATION_NAME}",
1314 gld${EMULATION_NAME}_finish,
1315 NULL, /* create output section statements */
1316 gld${EMULATION_NAME}_open_dynamic_archive,
1317 gld${EMULATION_NAME}_place_orphan,
1318 NULL, /* set symbols */
1319 gld${EMULATION_NAME}_parse_args,
1320 NULL, /* unrecognized file */
1321 gld${EMULATION_NAME}_list_options,
1322 NULL, /* recognized file */
1323 NULL /* find_potential_libraries */