1 # This shell script emits a C file. -*- C -*-
2 # It does some substitutions.
3 cat >e${EMULATION_NAME}.c <<EOF
4 /* This file is is generated by a shell script. DO NOT EDIT! */
6 /* 32 bit ELF emulation code for ${EMULATION_NAME}
7 Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
8 Written by Steve Chamberlain <sac@cygnus.com>
9 ELF support by Ian Lance Taylor <ian@cygnus.com>
11 This file is part of GLD, the Gnu Linker.
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 #define TARGET_IS_${EMULATION_NAME}
45 #ifdef TARGET_IS_i386lelf
49 # define dirent direct
50 # ifdef HAVE_SYS_NDIR_H
51 # include <sys/ndir.h>
53 # ifdef HAVE_SYS_DIR_H
62 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
63 static boolean gld${EMULATION_NAME}_open_dynamic_archive
64 PARAMS ((const char *, search_dirs_type *, lang_input_statement_type *));
65 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
66 static void gld${EMULATION_NAME}_check_needed
67 PARAMS ((lang_input_statement_type *));
68 static boolean gld${EMULATION_NAME}_search_needed
69 PARAMS ((const char *, const char *));
70 static boolean gld${EMULATION_NAME}_try_needed PARAMS ((const char *));
71 static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
72 static void gld${EMULATION_NAME}_find_statement_assignment
73 PARAMS ((lang_statement_union_type *));
74 static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
75 static boolean gld${EMULATION_NAME}_place_orphan
76 PARAMS ((lang_input_statement_type *, asection *));
77 static void gld${EMULATION_NAME}_place_section
78 PARAMS ((lang_statement_union_type *));
79 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
82 gld${EMULATION_NAME}_before_parse()
84 ldfile_output_architecture = bfd_arch_${ARCH};
85 config.dynamic_link = ${DYNAMIC_LINK-true};
88 #ifndef TARGET_IS_i386lelf
90 /* Try to open a dynamic archive. This is where we know that ELF
91 dynamic libraries have an extension of .so. */
94 gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry)
96 search_dirs_type *search;
97 lang_input_statement_type *entry;
102 if (! entry->is_archive)
105 filename = entry->filename;
107 string = (char *) xmalloc (strlen (search->name)
112 sprintf (string, "%s/lib%s%s.so", search->name, filename, arch);
114 if (! ldfile_try_open_bfd (string, entry))
120 entry->filename = string;
122 /* We have found a dynamic object to include in the link. The ELF
123 backend linker will create a DT_NEEDED entry in the .dynamic
124 section naming this file. If this file includes a DT_SONAME
125 entry, it will be used. Otherwise, the ELF linker will just use
126 the name of the file. For an archive found by searching, like
127 this one, the DT_NEEDED entry should consist of just the name of
128 the file, without the path information used to find it. Note
129 that we only need to do this if we have a dynamic object; an
130 archive will never be referenced by a DT_NEEDED entry.
132 FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
133 very pretty. I haven't been able to think of anything that is
135 if (bfd_check_format (entry->the_bfd, bfd_object)
136 && (entry->the_bfd->flags & DYNAMIC) != 0)
140 ASSERT (entry->is_archive && entry->search_dirs_flag);
141 needed_name = (char *) xmalloc (strlen (filename)
144 sprintf (needed_name, "lib%s%s.so", filename, arch);
145 bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name);
151 #else /* TARGET_IS_i386lelf */
153 /* Linux deviates from the SVR4 standard in that its archives use
154 version numbers in the file name. I think this is bogus, but
155 H.J. Lu insists that it be done this way. */
157 static int libcmp PARAMS ((const char *, const char *));
159 /* Choose between two library names. This is like a string
160 comparison, except that numbers are compared by value. */
169 if (isdigit (*p1) && isdigit (*p2))
171 unsigned long v1, v2;
173 v1 = strtoul (p1, (char **) &p1, 10);
174 v2 = strtoul (p2, (char **) &p2, 10);
197 /* Search for the library to open. */
201 gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry)
203 search_dirs_type *search;
204 lang_input_statement_type *entry;
212 len = strlen (entry->filename);
216 dir = opendir (search->name);
220 while ((ent = readdir (dir)) != NULL)
222 if (strncmp (ent->d_name, "lib", 3) != 0
223 || strncmp (ent->d_name + 3, entry->filename, len) != 0
224 || strncmp (ent->d_name + len + 3, ".so", 3) != 0)
229 if (libcmp (ent->d_name + len + 6, found + len + 6) < 0)
234 found = (char *) xmalloc (strlen (ent->d_name) + 1);
235 strcpy (found, ent->d_name);
243 string = (char *) xmalloc (strlen (search->name) + strlen (found) + 2);
244 sprintf (string, "%s/%s", search->name, found);
245 if (! ldfile_try_open_bfd (string, entry))
251 entry->filename = string;
253 if (bfd_check_format (entry->the_bfd, bfd_object)
254 && (entry->the_bfd->flags & DYNAMIC) != 0)
256 ASSERT (entry->is_archive && entry->search_dirs_flag);
257 bfd_elf_set_dt_needed_name (entry->the_bfd, found);
264 #endif /* TARGET_IS_i386lelf */
266 /* These variables are required to pass information back and forth
267 between after_open and check_needed. */
269 static struct bfd_elf_link_needed_list *global_needed;
270 static boolean global_found;
272 /* This is called after all the input files have been opened. */
275 gld${EMULATION_NAME}_after_open ()
277 struct bfd_elf_link_needed_list *needed, *l;
279 /* Get the list of files which appear in DT_NEEDED entries in
280 dynamic objects included in the link (often there will be none).
281 For each such file, we want to track down the corresponding
282 library, and include the symbol table in the link. This is what
283 the runtime dynamic linker will do. Tracking the files down here
284 permits one dynamic object to include another without requiring
285 special action by the person doing the link. Note that the
286 needed list can actually grow while we are stepping through this
288 needed = bfd_elf_get_needed_list (output_bfd, &link_info);
289 for (l = needed; l != NULL; l = l->next)
291 struct bfd_elf_link_needed_list *ll;
292 const char *lib_path;
294 search_dirs_type *search;
296 /* If we've already seen this file, skip it. */
297 for (ll = needed; ll != l; ll = ll->next)
298 if (strcmp (ll->name, l->name) == 0)
303 /* See if this file was included in the link explicitly. */
305 global_found = false;
306 lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
310 /* We need to find this file and include the symbol table. We
311 want to search for the file in the same way that the dynamic
312 linker will search. That means that we want to use rpath,
313 then the environment variable LD_LIBRARY_PATH, then the
314 linker script LIB_SEARCH_DIRS. We do not search using the -L
316 if (gld${EMULATION_NAME}_search_needed (command_line.rpath, l->name))
318 lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
319 if (gld${EMULATION_NAME}_search_needed (lib_path, l->name))
321 len = strlen (l->name);
322 for (search = search_head; search != NULL; search = search->next)
328 filename = (char *) xmalloc (strlen (search->name) + len + 2);
329 sprintf (filename, "%s/%s", search->name, l->name);
330 if (gld${EMULATION_NAME}_try_needed (filename))
337 einfo ("%P: warning: %s, needed by %B, not found\n",
342 /* Search for a needed file in a path. */
345 gld${EMULATION_NAME}_search_needed (path, name)
352 if (path == NULL || *path == '\0')
357 char *filename, *sset;
359 s = strchr (path, ':');
361 s = path + strlen (path);
363 filename = (char *) xmalloc (s - path + len + 2);
368 memcpy (filename, path, s - path);
369 filename[s - path] = '/';
370 sset = filename + (s - path) + 1;
374 if (gld${EMULATION_NAME}_try_needed (filename))
387 /* This function is called for each possible name for a dynamic object
388 named by a DT_NEEDED entry. */
391 gld${EMULATION_NAME}_try_needed (name)
396 abfd = bfd_openr (name, bfd_get_target (output_bfd));
399 if (! bfd_check_format (abfd, bfd_object))
401 (void) bfd_close (abfd);
404 if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
406 (void) bfd_close (abfd);
410 /* We've found a dynamic object matching the DT_NEEDED entry. */
412 /* Tell the ELF backend that don't want the output file to have a
413 DT_NEEDED entry for this file. */
414 bfd_elf_set_dt_needed_name (abfd, "");
416 /* Add this file into the symbol table. */
417 if (! bfd_link_add_symbols (abfd, &link_info))
418 einfo ("%F%B: could not read symbols: %E\n", abfd);
423 /* See if an input file matches a DT_NEEDED entry. */
426 gld${EMULATION_NAME}_check_needed (s)
427 lang_input_statement_type *s;
429 if (s->filename != NULL
430 && strcmp (s->filename, global_needed->name) == 0)
432 else if (s->search_dirs_flag
433 && s->filename != NULL
434 && strchr (global_needed->name, '/') == NULL)
438 f = strrchr (s->filename, '/');
440 && strcmp (f + 1, global_needed->name) == 0)
445 /* This is called after the sections have been attached to output
446 sections, but before any sizes or addresses have been set. */
449 gld${EMULATION_NAME}_before_allocation ()
453 /* If we are going to make any variable assignments, we need to let
454 the ELF backend know about them in case the variables are
455 referred to by dynamic objects. */
456 lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);
458 /* Let the ELF backend work out the sizes of any sections required
459 by dynamic linking. */
460 if (! bfd_elf32_size_dynamic_sections (output_bfd,
463 command_line.export_dynamic,
466 einfo ("%P%F: failed to set dynamic section sizes: %E\n");
468 /* Let the user override the dynamic linker we are using. */
469 if (command_line.interpreter != NULL
472 sinterp->contents = (bfd_byte *) command_line.interpreter;
473 sinterp->_raw_size = strlen (command_line.interpreter) + 1;
476 /* Look for any sections named .gnu.warning. As a GNU extensions,
477 we treat such sections as containing warning messages. We print
478 out the warning message, and then zero out the section size so
479 that it does not get copied into the output file. */
482 LANG_FOR_EACH_INPUT_STATEMENT (is)
489 if (is->just_syms_flag)
492 s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
496 sz = bfd_section_size (is->the_bfd, s);
497 msg = xmalloc ((size_t) sz + 1);
498 if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz))
499 einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n",
502 ret = link_info.callbacks->warning (&link_info, msg, is->the_bfd,
503 (asection *) NULL, (bfd_vma) 0);
507 /* Clobber the section size, so that we don't waste copying the
508 warning into the output file. */
513 #if defined (TARGET_IS_elf32bmip) || defined (TARGET_IS_elf32lmip)
514 /* For MIPS ELF the .reginfo section requires special handling.
515 Each input section is 24 bytes, and the final output section must
516 also be 24 bytes. We handle this by clobbering all but the first
517 input section size to 0. The .reginfo section is handled
518 specially by the backend code anyhow. */
520 boolean found = false;
521 LANG_FOR_EACH_INPUT_STATEMENT (is)
525 if (is->just_syms_flag)
528 s = bfd_get_section_by_name (is->the_bfd, ".reginfo");
545 /* This is called by the before_allocation routine via
546 lang_for_each_statement. It locates any assignment statements, and
547 tells the ELF backend about them, in case they are assignments to
548 symbols which are referred to by dynamic objects. */
551 gld${EMULATION_NAME}_find_statement_assignment (s)
552 lang_statement_union_type *s;
554 if (s->header.type == lang_assignment_statement_enum)
555 gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
558 /* Look through an expression for an assignment statement. */
561 gld${EMULATION_NAME}_find_exp_assignment (exp)
564 struct bfd_link_hash_entry *h;
566 switch (exp->type.node_class)
569 h = bfd_link_hash_lookup (link_info.hash, exp->assign.dst,
570 false, false, false);
574 /* We call record_link_assignment even if the symbol is defined.
575 This is because if it is defined by a dynamic object, we
576 actually want to use the value defined by the linker script,
577 not the value from the dynamic object (because we are setting
578 symbols like etext). If the symbol is defined by a regular
579 object, then, as it happens, calling record_link_assignment
584 if (strcmp (exp->assign.dst, ".") != 0)
586 if (! (bfd_elf32_record_link_assignment
587 (output_bfd, &link_info, exp->assign.dst,
588 exp->type.node_class == etree_provide ? true : false)))
589 einfo ("%P%F: failed to record assignment to %s: %E\n",
592 gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
596 gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
597 gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
601 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
602 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
603 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
607 gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
615 /* Place an orphan section. We use this to put random SHF_ALLOC
616 sections in the right segment. */
618 static asection *hold_section;
619 static lang_output_section_statement_type *hold_use;
620 static lang_output_section_statement_type *hold_text;
621 static lang_output_section_statement_type *hold_data;
622 static lang_output_section_statement_type *hold_bss;
623 static lang_output_section_statement_type *hold_rel;
627 gld${EMULATION_NAME}_place_orphan (file, s)
628 lang_input_statement_type *file;
631 lang_output_section_statement_type *place;
632 asection *snew, **pps;
633 lang_statement_list_type *old;
634 lang_statement_list_type add;
636 const char *secname, *ps;
637 lang_output_section_statement_type *os;
639 if ((s->flags & SEC_ALLOC) == 0)
642 /* Look through the script to see where to place this section. */
645 lang_for_each_statement (gld${EMULATION_NAME}_place_section);
647 if (hold_use != NULL)
649 /* We have already placed a section with this name. */
650 wild_doit (&hold_use->children, s, hold_use, file);
654 secname = bfd_get_section_name (s->owner, s);
656 /* If this is a final link, then always put .gnu.warning.SYMBOL
657 sections into the .text section to get them out of the way. */
658 if (! link_info.shared
659 && ! link_info.relocateable
660 && strncmp (secname, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0
661 && hold_text != NULL)
663 wild_doit (&hold_text->children, s, hold_text, file);
667 /* Decide which segment the section should go in based on the
668 section name and section flags. */
670 if ((s->flags & SEC_HAS_CONTENTS) == 0
673 else if ((s->flags & SEC_READONLY) == 0
674 && hold_data != NULL)
676 else if (strncmp (secname, ".rel", 4) == 0
679 else if ((s->flags & SEC_READONLY) != 0
680 && hold_text != NULL)
685 /* Create the section in the output file, and put it in the right
686 place. This shuffling is to make the output file look neater. */
687 snew = bfd_make_section (output_bfd, secname);
689 einfo ("%P%F: output format %s cannot represent section called %s\n",
690 output_bfd->xvec->name, secname);
691 if (place->bfd_section != NULL)
693 for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
696 snew->next = place->bfd_section->next;
697 place->bfd_section->next = snew;
700 /* Start building a list of statements for this section. */
703 lang_list_init (stat_ptr);
705 /* If the name of the section is representable in C, then create
706 symbols to mark the start and the end of the section. */
707 for (ps = secname; *ps != '\0'; ps++)
708 if (! isalnum (*ps) && *ps != '_')
710 if (*ps == '\0' && config.build_constructors)
714 symname = (char *) xmalloc (ps - secname + sizeof "__start_");
715 sprintf (symname, "__start_%s", secname);
716 lang_add_assignment (exp_assop ('=', symname,
717 exp_nameop (NAME, ".")));
720 if (! link_info.relocateable)
723 address = exp_intop ((bfd_vma) 0);
725 lang_enter_output_section_statement (secname, address, 0,
729 (etree_type *) NULL);
731 os = lang_output_section_statement_lookup (secname);
732 wild_doit (&os->children, s, os, file);
734 lang_leave_output_section_statement ((bfd_vma) 0, "*default*");
737 if (*ps == '\0' && config.build_constructors)
741 symname = (char *) xmalloc (ps - secname + sizeof "__stop_");
742 sprintf (symname, "__stop_%s", secname);
743 lang_add_assignment (exp_assop ('=', symname,
744 exp_nameop (NAME, ".")));
747 /* Now stick the new statement list right after PLACE. */
748 *add.tail = place->header.next;
749 place->header.next = add.head;
757 gld${EMULATION_NAME}_place_section (s)
758 lang_statement_union_type *s;
760 lang_output_section_statement_type *os;
762 if (s->header.type != lang_output_section_statement_enum)
765 os = &s->output_section_statement;
767 if (strcmp (os->name, hold_section->name) == 0)
770 if (strcmp (os->name, ".text") == 0)
772 else if (strcmp (os->name, ".data") == 0)
774 else if (strcmp (os->name, ".bss") == 0)
776 else if (hold_rel == NULL
777 && strncmp (os->name, ".rel", 4) == 0)
782 gld${EMULATION_NAME}_get_script(isfile)
786 if test -n "$COMPILE_IN"
788 # Scripts compiled in.
790 # sed commands to quote an ld script as a C string.
797 cat >>e${EMULATION_NAME}.c <<EOF
801 if (link_info.relocateable == true && config.build_constructors == true)
802 return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`;
803 else if (link_info.relocateable == true)
804 return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`;
805 else if (!config.text_read_only)
806 return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`;
807 else if (!config.magic_demand_paged)
808 return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`;
809 else if (link_info.shared)
810 return `sed "$sc" ldscripts/${EMULATION_NAME}.xs`;
812 return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
817 # Scripts read from the filesystem.
819 cat >>e${EMULATION_NAME}.c <<EOF
823 if (link_info.relocateable == true && config.build_constructors == true)
824 return "ldscripts/${EMULATION_NAME}.xu";
825 else if (link_info.relocateable == true)
826 return "ldscripts/${EMULATION_NAME}.xr";
827 else if (!config.text_read_only)
828 return "ldscripts/${EMULATION_NAME}.xbn";
829 else if (!config.magic_demand_paged)
830 return "ldscripts/${EMULATION_NAME}.xn";
831 else if (link_info.shared)
832 return "ldscripts/${EMULATION_NAME}.xs";
834 return "ldscripts/${EMULATION_NAME}.x";
840 cat >>e${EMULATION_NAME}.c <<EOF
842 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
844 gld${EMULATION_NAME}_before_parse,
848 gld${EMULATION_NAME}_after_open,
849 after_allocation_default,
850 set_output_arch_default,
851 ldemul_default_target,
852 gld${EMULATION_NAME}_before_allocation,
853 gld${EMULATION_NAME}_get_script,
858 gld${EMULATION_NAME}_open_dynamic_archive,
859 gld${EMULATION_NAME}_place_orphan