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 ${EMULATION_NAME}
7 Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
11 This file is part of GLD, the Gnu Linker.
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 #define TARGET_IS_${EMULATION_NAME}
46 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
47 static boolean gld${EMULATION_NAME}_open_dynamic_archive
48 PARAMS ((const char *, lang_input_statement_type *));
49 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
50 static void gld${EMULATION_NAME}_check_needed
51 PARAMS ((lang_input_statement_type *));
52 static boolean gld${EMULATION_NAME}_search_needed
53 PARAMS ((const char *, const char *));
54 static boolean gld${EMULATION_NAME}_try_needed PARAMS ((const char *));
55 static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
56 static void gld${EMULATION_NAME}_find_statement_assignment
57 PARAMS ((lang_statement_union_type *));
58 static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
59 static boolean gld${EMULATION_NAME}_place_orphan
60 PARAMS ((lang_input_statement_type *, asection *));
61 static void gld${EMULATION_NAME}_place_section
62 PARAMS ((lang_statement_union_type *));
63 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
66 gld${EMULATION_NAME}_before_parse()
68 ldfile_output_architecture = bfd_arch_${ARCH};
69 config.dynamic_link = ${DYNAMIC_LINK-true};
72 /* Try to open a dynamic archive. This is where we know that ELF
73 dynamic libraries have an extension of .so. */
76 gld${EMULATION_NAME}_open_dynamic_archive (arch, entry)
78 lang_input_statement_type *entry;
82 filename = entry->filename;
84 if (! ldfile_open_file_search (arch, entry, "lib", ".so"))
87 /* We have found a dynamic object to include in the link. The ELF
88 backend linker will create a DT_NEEDED entry in the .dynamic
89 section naming this file. If this file includes a DT_SONAME
90 entry, it will be used. Otherwise, the ELF linker will just use
91 the name of the file. For an archive found by searching, like
92 this one, the DT_NEEDED entry should consist of just the name of
93 the file, without the path information used to find it. Note
94 that we only need to do this if we have a dynamic object; an
95 archive will never be referenced by a DT_NEEDED entry.
97 FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
98 very pretty. I haven't been able to think of anything that is
100 if (bfd_check_format (entry->the_bfd, bfd_object)
101 && (entry->the_bfd->flags & DYNAMIC) != 0)
105 ASSERT (entry->is_archive && entry->search_dirs_flag);
106 needed_name = (char *) xmalloc (strlen (filename)
109 sprintf (needed_name, "lib%s%s.so", filename, arch);
110 bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name);
116 /* These variables are required to pass information back and forth
117 between after_open and check_needed. */
119 static struct bfd_elf_link_needed_list *global_needed;
120 static boolean global_found;
122 /* This is called after all the input files have been opened. */
125 gld${EMULATION_NAME}_after_open ()
127 struct bfd_elf_link_needed_list *needed, *l;
129 /* Get the list of files which appear in DT_NEEDED entries in
130 dynamic objects included in the link (often there will be none).
131 For each such file, we want to track down the corresponding
132 library, and include the symbol table in the link. This is what
133 the runtime dynamic linker will do. Tracking the files down here
134 permits one dynamic object to include another without requiring
135 special action by the person doing the link. Note that the
136 needed list can actually grow while we are stepping through this
138 needed = bfd_elf_get_needed_list (output_bfd, &link_info);
139 for (l = needed; l != NULL; l = l->next)
141 struct bfd_elf_link_needed_list *ll;
142 const char *lib_path;
144 search_dirs_type *search;
146 /* If we've already seen this file, skip it. */
147 for (ll = needed; ll != l; ll = ll->next)
148 if (strcmp (ll->name, l->name) == 0)
153 /* See if this file was included in the link explicitly. */
155 global_found = false;
156 lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
160 /* We need to find this file and include the symbol table. We
161 want to search for the file in the same way that the dynamic
162 linker will search. That means that we want to use rpath,
163 then the environment variable LD_LIBRARY_PATH, then the
164 linker script LIB_SEARCH_DIRS. We do not search using the -L
166 if (gld${EMULATION_NAME}_search_needed (command_line.rpath, l->name))
168 lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
169 if (gld${EMULATION_NAME}_search_needed (lib_path, l->name))
171 len = strlen (l->name);
172 for (search = search_head; search != NULL; search = search->next)
178 filename = (char *) xmalloc (strlen (search->name) + len + 2);
179 sprintf (filename, "%s/%s", search->name, l->name);
180 if (gld${EMULATION_NAME}_try_needed (filename))
187 einfo ("%P: warning: %s, needed by %B, not found\n",
192 /* Search for a needed file in a path. */
195 gld${EMULATION_NAME}_search_needed (path, name)
202 if (path == NULL || *path == '\0')
207 char *filename, *sset;
209 s = strchr (path, ':');
211 s = path + strlen (path);
213 filename = (char *) xmalloc (s - path + len + 2);
218 memcpy (filename, path, s - path);
219 filename[s - path] = '/';
220 sset = filename + (s - path) + 1;
224 if (gld${EMULATION_NAME}_try_needed (filename))
237 /* This function is called for each possible name for a dynamic object
238 named by a DT_NEEDED entry. */
241 gld${EMULATION_NAME}_try_needed (name)
246 abfd = bfd_openr (name, bfd_get_target (output_bfd));
249 if (! bfd_check_format (abfd, bfd_object))
251 (void) bfd_close (abfd);
254 if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
256 (void) bfd_close (abfd);
260 /* We've found a dynamic object matching the DT_NEEDED entry. */
262 /* Tell the ELF backend that don't want the output file to have a
263 DT_NEEDED entry for this file. */
264 bfd_elf_set_dt_needed_name (abfd, "");
266 /* Add this file into the symbol table. */
267 if (! bfd_link_add_symbols (abfd, &link_info))
268 einfo ("%F%B: could not read symbols: %E\n", abfd);
273 /* See if an input file matches a DT_NEEDED entry. */
276 gld${EMULATION_NAME}_check_needed (s)
277 lang_input_statement_type *s;
279 if (s->filename != NULL
280 && strcmp (s->filename, global_needed->name) == 0)
284 /* This is called after the sections have been attached to output
285 sections, but before any sizes or addresses have been set. */
288 gld${EMULATION_NAME}_before_allocation ()
292 /* If we are going to make any variable assignments, we need to let
293 the ELF backend know about them in case the variables are
294 referred to by dynamic objects. */
295 lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);
297 /* Let the ELF backend work out the sizes of any sections required
298 by dynamic linking. */
299 if (! bfd_elf32_size_dynamic_sections (output_bfd,
302 command_line.export_dynamic,
305 einfo ("%P%F: failed to set dynamic section sizes: %E\n");
307 /* Let the user override the dynamic linker we are using. */
308 if (command_line.interpreter != NULL
311 sinterp->contents = (bfd_byte *) command_line.interpreter;
312 sinterp->_raw_size = strlen (command_line.interpreter) + 1;
315 /* Look for any sections named .gnu.warning. As a GNU extensions,
316 we treat such sections as containing warning messages. We print
317 out the warning message, and then zero out the section size so
318 that it does not get copied into the output file. */
321 LANG_FOR_EACH_INPUT_STATEMENT (is)
328 if (is->just_syms_flag)
331 s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
335 sz = bfd_section_size (is->the_bfd, s);
336 msg = xmalloc ((size_t) sz + 1);
337 if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz))
338 einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n",
341 ret = link_info.callbacks->warning (&link_info, msg);
345 /* Clobber the section size, so that we don't waste copying the
346 warning into the output file. */
351 #if defined (TARGET_IS_elf32bmip) || defined (TARGET_IS_elf32lmip)
352 /* For MIPS ELF the .reginfo section requires special handling.
353 Each input section is 24 bytes, and the final output section must
354 also be 24 bytes. We handle this by clobbering all but the first
355 input section size to 0. The .reginfo section is handled
356 specially by the backend code anyhow. */
358 boolean found = false;
359 LANG_FOR_EACH_INPUT_STATEMENT (is)
363 if (is->just_syms_flag)
366 s = bfd_get_section_by_name (is->the_bfd, ".reginfo");
383 /* This is called by the before_allocation routine via
384 lang_for_each_statement. It locates any assignment statements, and
385 tells the ELF backend about them, in case they are assignments to
386 symbols which are referred to by dynamic objects. */
389 gld${EMULATION_NAME}_find_statement_assignment (s)
390 lang_statement_union_type *s;
392 if (s->header.type == lang_assignment_statement_enum)
393 gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
396 /* Look through an expression for an assignment statement. */
399 gld${EMULATION_NAME}_find_exp_assignment (exp)
402 struct bfd_link_hash_entry *h;
404 switch (exp->type.node_class)
407 h = bfd_link_hash_lookup (link_info.hash, exp->assign.dst,
408 false, false, false);
412 /* We call record_link_assignment even if the symbol is defined.
413 This is because if it is defined by a dynamic object, we
414 actually want to use the value defined by the linker script,
415 not the value from the dynamic object (because we are setting
416 symbols like etext). If the symbol is defined by a regular
417 object, then, as it happens, calling record_link_assignment
422 if (strcmp (exp->assign.dst, ".") != 0)
424 if (! (bfd_elf32_record_link_assignment
425 (output_bfd, &link_info, exp->assign.dst,
426 exp->type.node_class == etree_provide ? true : false)))
427 einfo ("%P%F: failed to record assignment to %s: %E\n",
430 gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
434 gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
435 gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
439 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
440 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
441 gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
445 gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
453 /* Place an orphan section. We use this to put random SHF_ALLOC
454 sections in the right segment. */
456 static asection *hold_section;
457 static lang_output_section_statement_type *hold_use;
458 static lang_output_section_statement_type *hold_text;
459 static lang_output_section_statement_type *hold_data;
460 static lang_output_section_statement_type *hold_bss;
461 static lang_output_section_statement_type *hold_rel;
465 gld${EMULATION_NAME}_place_orphan (file, s)
466 lang_input_statement_type *file;
469 lang_output_section_statement_type *place;
470 asection *snew, **pps;
471 lang_statement_list_type *old;
472 lang_statement_list_type add;
474 const char *secname, *ps;
475 lang_output_section_statement_type *os;
477 if ((s->flags & SEC_ALLOC) == 0)
480 /* Look through the script to see where to place this section. */
483 lang_for_each_statement (gld${EMULATION_NAME}_place_section);
485 if (hold_use != NULL)
487 /* We have already placed a section with this name. */
488 wild_doit (&hold_use->children, s, hold_use, file);
492 secname = bfd_get_section_name (s->owner, s);
494 /* Decide which segment the section should go in based on the
495 section name and section flags. */
497 if ((s->flags & SEC_HAS_CONTENTS) == 0
500 else if ((s->flags & SEC_READONLY) == 0
501 && hold_data != NULL)
503 else if (strncmp (secname, ".rel", 4) == 0
506 else if ((s->flags & SEC_READONLY) != 0
507 && hold_text != NULL)
512 /* Create the section in the output file, and put it in the right
513 place. This shuffling is to make the output file look neater. */
514 snew = bfd_make_section (output_bfd, secname);
516 einfo ("%P%F: output format %s cannot represent section called %s\n",
517 output_bfd->xvec->name, secname);
518 if (place->bfd_section != NULL)
520 for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
523 snew->next = place->bfd_section->next;
524 place->bfd_section->next = snew;
527 /* Start building a list of statements for this section. */
530 lang_list_init (stat_ptr);
532 /* If the name of the section is representable in C, then create
533 symbols to mark the start and the end of the section. */
534 for (ps = secname; *ps != '\0'; ps++)
535 if (! isalnum (*ps) && *ps != '_')
537 if (*ps == '\0' && config.build_constructors)
541 symname = (char *) xmalloc (ps - secname + sizeof "__start_");
542 sprintf (symname, "__start_%s", secname);
543 lang_add_assignment (exp_assop ('=', symname,
544 exp_nameop (NAME, ".")));
547 if (! link_info.relocateable)
550 address = exp_intop ((bfd_vma) 0);
552 lang_enter_output_section_statement (secname, address, 0,
556 (etree_type *) NULL);
558 os = lang_output_section_statement_lookup (secname);
559 wild_doit (&os->children, s, os, file);
561 lang_leave_output_section_statement ((bfd_vma) 0, "*default*");
564 if (*ps == '\0' && config.build_constructors)
568 symname = (char *) xmalloc (ps - secname + sizeof "__stop_");
569 sprintf (symname, "__stop_%s", secname);
570 lang_add_assignment (exp_assop ('=', symname,
571 exp_nameop (NAME, ".")));
574 /* Now stick the new statement list right after PLACE. */
575 *add.tail = place->header.next;
576 place->header.next = add.head;
584 gld${EMULATION_NAME}_place_section (s)
585 lang_statement_union_type *s;
587 lang_output_section_statement_type *os;
589 if (s->header.type != lang_output_section_statement_enum)
592 os = &s->output_section_statement;
594 if (strcmp (os->name, hold_section->name) == 0)
597 if (strcmp (os->name, ".text") == 0)
599 else if (strcmp (os->name, ".data") == 0)
601 else if (strcmp (os->name, ".bss") == 0)
603 else if (hold_rel == NULL
604 && strncmp (os->name, ".rel", 4) == 0)
609 gld${EMULATION_NAME}_get_script(isfile)
613 if test -n "$COMPILE_IN"
615 # Scripts compiled in.
617 # sed commands to quote an ld script as a C string.
624 cat >>e${EMULATION_NAME}.c <<EOF
628 if (link_info.relocateable == true && config.build_constructors == true)
629 return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`;
630 else if (link_info.relocateable == true)
631 return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`;
632 else if (!config.text_read_only)
633 return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`;
634 else if (!config.magic_demand_paged)
635 return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`;
636 else if (link_info.shared)
637 return `sed "$sc" ldscripts/${EMULATION_NAME}.xs`;
639 return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
644 # Scripts read from the filesystem.
646 cat >>e${EMULATION_NAME}.c <<EOF
650 if (link_info.relocateable == true && config.build_constructors == true)
651 return "ldscripts/${EMULATION_NAME}.xu";
652 else if (link_info.relocateable == true)
653 return "ldscripts/${EMULATION_NAME}.xr";
654 else if (!config.text_read_only)
655 return "ldscripts/${EMULATION_NAME}.xbn";
656 else if (!config.magic_demand_paged)
657 return "ldscripts/${EMULATION_NAME}.xn";
658 else if (link_info.shared)
659 return "ldscripts/${EMULATION_NAME}.xs";
661 return "ldscripts/${EMULATION_NAME}.x";
667 cat >>e${EMULATION_NAME}.c <<EOF
669 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
671 gld${EMULATION_NAME}_before_parse,
675 gld${EMULATION_NAME}_after_open,
676 after_allocation_default,
677 set_output_arch_default,
678 ldemul_default_target,
679 gld${EMULATION_NAME}_before_allocation,
680 gld${EMULATION_NAME}_get_script,
685 gld${EMULATION_NAME}_open_dynamic_archive,
686 gld${EMULATION_NAME}_place_orphan