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252b5132 RH |
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 "${ELFSIZE}" && ELFSIZE=32 | |
6 | cat >e${EMULATION_NAME}.c <<EOF | |
7 | /* This file is is generated by a shell script. DO NOT EDIT! */ | |
8 | ||
9 | /* ${ELFSIZE} bit ELF emulation code for ${EMULATION_NAME} | |
87f2a346 ILT |
10 | Copyright (C) 1991, 93, 94, 95, 96, 97, 98, 1999 |
11 | Free Software Foundation, Inc. | |
252b5132 RH |
12 | Written by Steve Chamberlain <sac@cygnus.com> |
13 | ELF support by Ian Lance Taylor <ian@cygnus.com> | |
14 | ||
15 | This file is part of GLD, the Gnu Linker. | |
16 | ||
17 | This program is free software; you can redistribute it and/or modify | |
18 | it under the terms of the GNU General Public License as published by | |
19 | the Free Software Foundation; either version 2 of the License, or | |
20 | (at your option) any later version. | |
21 | ||
22 | This program is distributed in the hope that it will be useful, | |
23 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | GNU General Public License for more details. | |
26 | ||
27 | You should have received a copy of the GNU General Public License | |
28 | along with this program; if not, write to the Free Software | |
29 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
30 | ||
31 | #define TARGET_IS_${EMULATION_NAME} | |
32 | ||
33 | #include "bfd.h" | |
34 | #include "sysdep.h" | |
35 | ||
36 | #include <ctype.h> | |
37 | ||
38 | #include "bfdlink.h" | |
39 | ||
40 | #include "ld.h" | |
41 | #include "ldmain.h" | |
42 | #include "ldemul.h" | |
43 | #include "ldfile.h" | |
44 | #include "ldmisc.h" | |
45 | #include "ldexp.h" | |
46 | #include "ldlang.h" | |
47 | #include "ldgram.h" | |
48 | ||
49 | static void gld${EMULATION_NAME}_before_parse PARAMS ((void)); | |
50 | static boolean gld${EMULATION_NAME}_open_dynamic_archive | |
51 | PARAMS ((const char *, search_dirs_type *, lang_input_statement_type *)); | |
52 | static void gld${EMULATION_NAME}_after_open PARAMS ((void)); | |
53 | static void gld${EMULATION_NAME}_check_needed | |
54 | PARAMS ((lang_input_statement_type *)); | |
55 | static void gld${EMULATION_NAME}_stat_needed | |
56 | PARAMS ((lang_input_statement_type *)); | |
57 | static boolean gld${EMULATION_NAME}_search_needed | |
58 | PARAMS ((const char *, const char *, int)); | |
59 | static boolean gld${EMULATION_NAME}_try_needed PARAMS ((const char *, int)); | |
60 | static void gld${EMULATION_NAME}_vercheck | |
61 | PARAMS ((lang_input_statement_type *)); | |
62 | static void gld${EMULATION_NAME}_before_allocation PARAMS ((void)); | |
63 | static void gld${EMULATION_NAME}_find_statement_assignment | |
64 | PARAMS ((lang_statement_union_type *)); | |
65 | static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *)); | |
66 | static boolean gld${EMULATION_NAME}_place_orphan | |
67 | PARAMS ((lang_input_statement_type *, asection *)); | |
68 | static void gld${EMULATION_NAME}_place_section | |
69 | PARAMS ((lang_statement_union_type *)); | |
70 | static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile)); | |
71 | ||
72 | static void | |
73 | gld${EMULATION_NAME}_before_parse() | |
74 | { | |
75 | ldfile_output_architecture = bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`; | |
76 | config.dynamic_link = ${DYNAMIC_LINK-true}; | |
77 | config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo true ; else echo false ; fi`; | |
78 | } | |
79 | ||
80 | /* Try to open a dynamic archive. This is where we know that ELF | |
81 | dynamic libraries have an extension of .so. */ | |
82 | ||
83 | static boolean | |
84 | gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry) | |
85 | const char *arch; | |
86 | search_dirs_type *search; | |
87 | lang_input_statement_type *entry; | |
88 | { | |
89 | const char *filename; | |
90 | char *string; | |
91 | ||
92 | if (! entry->is_archive) | |
93 | return false; | |
94 | ||
95 | filename = entry->filename; | |
96 | ||
97 | string = (char *) xmalloc (strlen (search->name) | |
98 | + strlen (filename) | |
99 | + strlen (arch) | |
100 | + sizeof "/lib.so"); | |
101 | ||
102 | sprintf (string, "%s/lib%s%s.so", search->name, filename, arch); | |
103 | ||
104 | if (! ldfile_try_open_bfd (string, entry)) | |
105 | { | |
106 | free (string); | |
107 | return false; | |
108 | } | |
109 | ||
110 | entry->filename = string; | |
111 | ||
112 | /* We have found a dynamic object to include in the link. The ELF | |
113 | backend linker will create a DT_NEEDED entry in the .dynamic | |
114 | section naming this file. If this file includes a DT_SONAME | |
115 | entry, it will be used. Otherwise, the ELF linker will just use | |
116 | the name of the file. For an archive found by searching, like | |
117 | this one, the DT_NEEDED entry should consist of just the name of | |
118 | the file, without the path information used to find it. Note | |
119 | that we only need to do this if we have a dynamic object; an | |
120 | archive will never be referenced by a DT_NEEDED entry. | |
121 | ||
122 | FIXME: This approach--using bfd_elf_set_dt_needed_name--is not | |
123 | very pretty. I haven't been able to think of anything that is | |
124 | pretty, though. */ | |
125 | if (bfd_check_format (entry->the_bfd, bfd_object) | |
126 | && (entry->the_bfd->flags & DYNAMIC) != 0) | |
127 | { | |
128 | char *needed_name; | |
129 | ||
130 | ASSERT (entry->is_archive && entry->search_dirs_flag); | |
131 | needed_name = (char *) xmalloc (strlen (filename) | |
132 | + strlen (arch) | |
133 | + sizeof "lib.so"); | |
134 | sprintf (needed_name, "lib%s%s.so", filename, arch); | |
135 | bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name); | |
136 | } | |
137 | ||
138 | return true; | |
139 | } | |
140 | ||
141 | EOF | |
142 | if [ "x${host}" = "x${target}" ] ; then | |
f97f7300 RH |
143 | case " ${EMULATION_LIBPATH} " in |
144 | *" ${EMULATION_NAME} "*) | |
252b5132 RH |
145 | cat >>e${EMULATION_NAME}.c <<EOF |
146 | ||
147 | /* For a native linker, check the file /etc/ld.so.conf for directories | |
148 | in which we may find shared libraries. /etc/ld.so.conf is really | |
149 | only meaningful on Linux, but we check it on other systems anyhow. */ | |
150 | ||
151 | static boolean gld${EMULATION_NAME}_check_ld_so_conf | |
152 | PARAMS ((const char *, int)); | |
153 | ||
154 | static boolean | |
155 | gld${EMULATION_NAME}_check_ld_so_conf (name, force) | |
156 | const char *name; | |
157 | int force; | |
158 | { | |
159 | static boolean initialized; | |
160 | static char *ld_so_conf; | |
161 | ||
162 | if (! initialized) | |
163 | { | |
164 | FILE *f; | |
165 | ||
166 | f = fopen ("/etc/ld.so.conf", FOPEN_RT); | |
167 | if (f != NULL) | |
168 | { | |
169 | char *b; | |
170 | size_t len, alloc; | |
171 | int c; | |
172 | ||
173 | len = 0; | |
174 | alloc = 100; | |
175 | b = (char *) xmalloc (alloc); | |
176 | ||
177 | while ((c = getc (f)) != EOF) | |
178 | { | |
179 | if (len + 1 >= alloc) | |
180 | { | |
181 | alloc *= 2; | |
182 | b = (char *) xrealloc (b, alloc); | |
183 | } | |
184 | if (c != ':' | |
185 | && c != ' ' | |
186 | && c != '\t' | |
187 | && c != '\n' | |
188 | && c != ',') | |
189 | { | |
190 | b[len] = c; | |
191 | ++len; | |
192 | } | |
193 | else | |
194 | { | |
195 | if (len > 0 && b[len - 1] != ':') | |
196 | { | |
197 | b[len] = ':'; | |
198 | ++len; | |
199 | } | |
200 | } | |
201 | } | |
202 | ||
203 | if (len > 0 && b[len - 1] == ':') | |
204 | --len; | |
205 | ||
206 | if (len > 0) | |
207 | b[len] = '\0'; | |
208 | else | |
209 | { | |
210 | free (b); | |
211 | b = NULL; | |
212 | } | |
213 | ||
214 | fclose (f); | |
215 | ||
216 | ld_so_conf = b; | |
217 | } | |
218 | ||
219 | initialized = true; | |
220 | } | |
221 | ||
222 | if (ld_so_conf == NULL) | |
223 | return false; | |
224 | ||
225 | return gld${EMULATION_NAME}_search_needed (ld_so_conf, name, force); | |
226 | } | |
227 | ||
228 | EOF | |
f97f7300 RH |
229 | ;; |
230 | esac | |
252b5132 RH |
231 | fi |
232 | cat >>e${EMULATION_NAME}.c <<EOF | |
233 | ||
234 | /* These variables are required to pass information back and forth | |
235 | between after_open and check_needed and stat_needed and vercheck. */ | |
236 | ||
237 | static struct bfd_link_needed_list *global_needed; | |
238 | static struct stat global_stat; | |
239 | static boolean global_found; | |
240 | static struct bfd_link_needed_list *global_vercheck_needed; | |
241 | static boolean global_vercheck_failed; | |
242 | ||
243 | /* This is called after all the input files have been opened. */ | |
244 | ||
245 | static void | |
246 | gld${EMULATION_NAME}_after_open () | |
247 | { | |
248 | struct bfd_link_needed_list *needed, *l; | |
249 | ||
250 | /* We only need to worry about this when doing a final link. */ | |
251 | if (link_info.relocateable || link_info.shared) | |
252 | return; | |
253 | ||
254 | /* Get the list of files which appear in DT_NEEDED entries in | |
255 | dynamic objects included in the link (often there will be none). | |
256 | For each such file, we want to track down the corresponding | |
257 | library, and include the symbol table in the link. This is what | |
258 | the runtime dynamic linker will do. Tracking the files down here | |
259 | permits one dynamic object to include another without requiring | |
260 | special action by the person doing the link. Note that the | |
261 | needed list can actually grow while we are stepping through this | |
262 | loop. */ | |
263 | needed = bfd_elf_get_needed_list (output_bfd, &link_info); | |
264 | for (l = needed; l != NULL; l = l->next) | |
265 | { | |
266 | struct bfd_link_needed_list *ll; | |
267 | int force; | |
268 | ||
269 | /* If we've already seen this file, skip it. */ | |
270 | for (ll = needed; ll != l; ll = ll->next) | |
271 | if (strcmp (ll->name, l->name) == 0) | |
272 | break; | |
273 | if (ll != l) | |
274 | continue; | |
275 | ||
276 | /* See if this file was included in the link explicitly. */ | |
277 | global_needed = l; | |
278 | global_found = false; | |
279 | lang_for_each_input_file (gld${EMULATION_NAME}_check_needed); | |
280 | if (global_found) | |
281 | continue; | |
282 | ||
283 | /* We need to find this file and include the symbol table. We | |
284 | want to search for the file in the same way that the dynamic | |
285 | linker will search. That means that we want to use | |
286 | rpath_link, rpath, then the environment variable | |
287 | LD_LIBRARY_PATH (native only), then the linker script | |
288 | LIB_SEARCH_DIRS. We do not search using the -L arguments. | |
289 | ||
290 | We search twice. The first time, we skip objects which may | |
291 | introduce version mismatches. The second time, we force | |
292 | their use. See gld${EMULATION_NAME}_vercheck comment. */ | |
293 | for (force = 0; force < 2; force++) | |
294 | { | |
295 | const char *lib_path; | |
296 | size_t len; | |
297 | search_dirs_type *search; | |
298 | ||
299 | if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link, | |
300 | l->name, force)) | |
301 | break; | |
302 | if (gld${EMULATION_NAME}_search_needed (command_line.rpath, | |
303 | l->name, force)) | |
304 | break; | |
305 | if (command_line.rpath_link == NULL | |
306 | && command_line.rpath == NULL) | |
307 | { | |
308 | lib_path = (const char *) getenv ("LD_RUN_PATH"); | |
309 | if (gld${EMULATION_NAME}_search_needed (lib_path, l->name, | |
310 | force)) | |
311 | break; | |
312 | } | |
313 | EOF | |
314 | if [ "x${host}" = "x${target}" ] ; then | |
f97f7300 RH |
315 | case " ${EMULATION_LIBPATH} " in |
316 | *" ${EMULATION_NAME} "*) | |
252b5132 RH |
317 | cat >>e${EMULATION_NAME}.c <<EOF |
318 | lib_path = (const char *) getenv ("LD_LIBRARY_PATH"); | |
319 | if (gld${EMULATION_NAME}_search_needed (lib_path, l->name, force)) | |
320 | break; | |
321 | EOF | |
f97f7300 RH |
322 | ;; |
323 | esac | |
252b5132 RH |
324 | fi |
325 | cat >>e${EMULATION_NAME}.c <<EOF | |
326 | len = strlen (l->name); | |
327 | for (search = search_head; search != NULL; search = search->next) | |
328 | { | |
329 | char *filename; | |
330 | ||
331 | if (search->cmdline) | |
332 | continue; | |
333 | filename = (char *) xmalloc (strlen (search->name) + len + 2); | |
334 | sprintf (filename, "%s/%s", search->name, l->name); | |
335 | if (gld${EMULATION_NAME}_try_needed (filename, force)) | |
336 | break; | |
337 | free (filename); | |
338 | } | |
339 | if (search != NULL) | |
340 | break; | |
341 | EOF | |
342 | if [ "x${host}" = "x${target}" ] ; then | |
f97f7300 RH |
343 | case " ${EMULATION_LIBPATH} " in |
344 | *" ${EMULATION_NAME} "*) | |
252b5132 RH |
345 | cat >>e${EMULATION_NAME}.c <<EOF |
346 | if (gld${EMULATION_NAME}_check_ld_so_conf (l->name, force)) | |
347 | break; | |
348 | EOF | |
f97f7300 RH |
349 | ;; |
350 | esac | |
252b5132 RH |
351 | fi |
352 | cat >>e${EMULATION_NAME}.c <<EOF | |
353 | } | |
354 | ||
355 | if (force < 2) | |
356 | continue; | |
357 | ||
358 | einfo ("%P: warning: %s, needed by %B, not found (try using --rpath)\n", | |
359 | l->name, l->by); | |
360 | } | |
361 | } | |
362 | ||
363 | /* Search for a needed file in a path. */ | |
364 | ||
365 | static boolean | |
366 | gld${EMULATION_NAME}_search_needed (path, name, force) | |
367 | const char *path; | |
368 | const char *name; | |
369 | int force; | |
370 | { | |
371 | const char *s; | |
372 | size_t len; | |
373 | ||
374 | if (path == NULL || *path == '\0') | |
375 | return false; | |
376 | len = strlen (name); | |
377 | while (1) | |
378 | { | |
379 | char *filename, *sset; | |
380 | ||
381 | s = strchr (path, ':'); | |
382 | if (s == NULL) | |
383 | s = path + strlen (path); | |
384 | ||
385 | filename = (char *) xmalloc (s - path + len + 2); | |
386 | if (s == path) | |
387 | sset = filename; | |
388 | else | |
389 | { | |
390 | memcpy (filename, path, s - path); | |
391 | filename[s - path] = '/'; | |
392 | sset = filename + (s - path) + 1; | |
393 | } | |
394 | strcpy (sset, name); | |
395 | ||
396 | if (gld${EMULATION_NAME}_try_needed (filename, force)) | |
397 | return true; | |
398 | ||
399 | free (filename); | |
400 | ||
401 | if (*s == '\0') | |
402 | break; | |
403 | path = s + 1; | |
404 | } | |
405 | ||
406 | return false; | |
407 | } | |
408 | ||
409 | /* This function is called for each possible name for a dynamic object | |
410 | named by a DT_NEEDED entry. The FORCE parameter indicates whether | |
411 | to skip the check for a conflicting version. */ | |
412 | ||
413 | static boolean | |
414 | gld${EMULATION_NAME}_try_needed (name, force) | |
415 | const char *name; | |
416 | int force; | |
417 | { | |
418 | bfd *abfd; | |
419 | ||
420 | abfd = bfd_openr (name, bfd_get_target (output_bfd)); | |
421 | if (abfd == NULL) | |
422 | return false; | |
423 | if (! bfd_check_format (abfd, bfd_object)) | |
424 | { | |
425 | (void) bfd_close (abfd); | |
426 | return false; | |
427 | } | |
428 | if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0) | |
429 | { | |
430 | (void) bfd_close (abfd); | |
431 | return false; | |
432 | } | |
433 | ||
434 | /* Check whether this object would include any conflicting library | |
435 | versions. If FORCE is set, then we skip this check; we use this | |
436 | the second time around, if we couldn't find any compatible | |
437 | instance of the shared library. */ | |
438 | ||
439 | if (! force) | |
440 | { | |
441 | struct bfd_link_needed_list *needed; | |
442 | ||
443 | if (! bfd_elf_get_bfd_needed_list (abfd, &needed)) | |
444 | einfo ("%F%P:%B: bfd_elf_get_bfd_needed_list failed: %E\n", abfd); | |
445 | ||
446 | if (needed != NULL) | |
447 | { | |
448 | global_vercheck_needed = needed; | |
449 | global_vercheck_failed = false; | |
450 | lang_for_each_input_file (gld${EMULATION_NAME}_vercheck); | |
451 | if (global_vercheck_failed) | |
452 | { | |
453 | (void) bfd_close (abfd); | |
454 | /* Return false to force the caller to move on to try | |
455 | another file on the search path. */ | |
456 | return false; | |
457 | } | |
458 | ||
459 | /* But wait! It gets much worse. On Linux, if a shared | |
460 | library does not use libc at all, we are supposed to skip | |
461 | it the first time around in case we encounter a shared | |
462 | library later on with the same name which does use the | |
463 | version of libc that we want. This is much too horrible | |
464 | to use on any system other than Linux. */ | |
465 | ||
466 | EOF | |
467 | case ${target} in | |
468 | *-*-linux-gnu*) | |
469 | cat >>e${EMULATION_NAME}.c <<EOF | |
470 | { | |
471 | struct bfd_link_needed_list *l; | |
472 | ||
473 | for (l = needed; l != NULL; l = l->next) | |
474 | if (strncmp (l->name, "libc.so", 7) == 0) | |
475 | break; | |
476 | if (l == NULL) | |
477 | { | |
478 | (void) bfd_close (abfd); | |
479 | return false; | |
480 | } | |
481 | } | |
482 | ||
483 | EOF | |
484 | ;; | |
485 | esac | |
486 | cat >>e${EMULATION_NAME}.c <<EOF | |
487 | } | |
488 | } | |
489 | ||
490 | /* We've found a dynamic object matching the DT_NEEDED entry. */ | |
491 | ||
492 | /* We have already checked that there is no other input file of the | |
493 | same name. We must now check again that we are not including the | |
494 | same file twice. We need to do this because on many systems | |
495 | libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will | |
496 | reference libc.so.1. If we have already included libc.so, we | |
497 | don't want to include libc.so.1 if they are the same file, and we | |
498 | can only check that using stat. */ | |
499 | ||
500 | if (bfd_stat (abfd, &global_stat) != 0) | |
501 | einfo ("%F%P:%B: bfd_stat failed: %E\n", abfd); | |
502 | global_found = false; | |
503 | lang_for_each_input_file (gld${EMULATION_NAME}_stat_needed); | |
504 | if (global_found) | |
505 | { | |
506 | /* Return true to indicate that we found the file, even though | |
507 | we aren't going to do anything with it. */ | |
508 | return true; | |
509 | } | |
510 | ||
511 | /* Tell the ELF backend that don't want the output file to have a | |
512 | DT_NEEDED entry for this file. */ | |
513 | bfd_elf_set_dt_needed_name (abfd, ""); | |
514 | ||
515 | /* Add this file into the symbol table. */ | |
516 | if (! bfd_link_add_symbols (abfd, &link_info)) | |
517 | einfo ("%F%B: could not read symbols: %E\n", abfd); | |
518 | ||
519 | return true; | |
520 | } | |
521 | ||
522 | /* See if an input file matches a DT_NEEDED entry by name. */ | |
523 | ||
524 | static void | |
525 | gld${EMULATION_NAME}_check_needed (s) | |
526 | lang_input_statement_type *s; | |
527 | { | |
528 | if (global_found) | |
529 | return; | |
530 | ||
531 | if (s->filename != NULL | |
532 | && strcmp (s->filename, global_needed->name) == 0) | |
533 | { | |
534 | global_found = true; | |
535 | return; | |
536 | } | |
537 | ||
538 | if (s->the_bfd != NULL) | |
539 | { | |
540 | const char *soname; | |
541 | ||
542 | soname = bfd_elf_get_dt_soname (s->the_bfd); | |
543 | if (soname != NULL | |
544 | && strcmp (soname, global_needed->name) == 0) | |
545 | { | |
546 | global_found = true; | |
547 | return; | |
548 | } | |
549 | } | |
550 | ||
551 | if (s->search_dirs_flag | |
552 | && s->filename != NULL | |
553 | && strchr (global_needed->name, '/') == NULL) | |
554 | { | |
555 | const char *f; | |
556 | ||
557 | f = strrchr (s->filename, '/'); | |
558 | if (f != NULL | |
559 | && strcmp (f + 1, global_needed->name) == 0) | |
560 | { | |
561 | global_found = true; | |
562 | return; | |
563 | } | |
564 | } | |
565 | } | |
566 | ||
567 | /* See if an input file matches a DT_NEEDED entry by running stat on | |
568 | the file. */ | |
569 | ||
570 | static void | |
571 | gld${EMULATION_NAME}_stat_needed (s) | |
572 | lang_input_statement_type *s; | |
573 | { | |
574 | struct stat st; | |
575 | const char *suffix; | |
576 | const char *soname; | |
577 | const char *f; | |
578 | ||
579 | if (global_found) | |
580 | return; | |
581 | if (s->the_bfd == NULL) | |
582 | return; | |
583 | ||
584 | if (bfd_stat (s->the_bfd, &st) != 0) | |
585 | { | |
586 | einfo ("%P:%B: bfd_stat failed: %E\n", s->the_bfd); | |
587 | return; | |
588 | } | |
589 | ||
590 | if (st.st_dev == global_stat.st_dev | |
591 | && st.st_ino == global_stat.st_ino) | |
592 | { | |
593 | global_found = true; | |
594 | return; | |
595 | } | |
596 | ||
597 | /* We issue a warning if it looks like we are including two | |
598 | different versions of the same shared library. For example, | |
599 | there may be a problem if -lc picks up libc.so.6 but some other | |
600 | shared library has a DT_NEEDED entry of libc.so.5. This is a | |
601 | hueristic test, and it will only work if the name looks like | |
602 | NAME.so.VERSION. FIXME: Depending on file names is error-prone. | |
603 | If we really want to issue warnings about mixing version numbers | |
604 | of shared libraries, we need to find a better way. */ | |
605 | ||
606 | if (strchr (global_needed->name, '/') != NULL) | |
607 | return; | |
608 | suffix = strstr (global_needed->name, ".so."); | |
609 | if (suffix == NULL) | |
610 | return; | |
611 | suffix += sizeof ".so." - 1; | |
612 | ||
613 | soname = bfd_elf_get_dt_soname (s->the_bfd); | |
614 | if (soname == NULL) | |
615 | soname = s->filename; | |
616 | ||
617 | f = strrchr (soname, '/'); | |
618 | if (f != NULL) | |
619 | ++f; | |
620 | else | |
621 | f = soname; | |
622 | ||
623 | if (strncmp (f, global_needed->name, suffix - global_needed->name) == 0) | |
624 | einfo ("%P: warning: %s, needed by %B, may conflict with %s\n", | |
625 | global_needed->name, global_needed->by, f); | |
626 | } | |
627 | ||
628 | /* On Linux, it's possible to have different versions of the same | |
629 | shared library linked against different versions of libc. The | |
630 | dynamic linker somehow tags which libc version to use in | |
631 | /etc/ld.so.cache, and, based on the libc that it sees in the | |
632 | executable, chooses which version of the shared library to use. | |
633 | ||
634 | We try to do a similar check here by checking whether this shared | |
635 | library needs any other shared libraries which may conflict with | |
636 | libraries we have already included in the link. If it does, we | |
637 | skip it, and try to find another shared library farther on down the | |
638 | link path. | |
639 | ||
640 | This is called via lang_for_each_input_file. | |
641 | GLOBAL_VERCHECK_NEEDED is the list of objects needed by the object | |
642 | which we ar checking. This sets GLOBAL_VERCHECK_FAILED if we find | |
643 | a conflicting version. */ | |
644 | ||
645 | static void | |
646 | gld${EMULATION_NAME}_vercheck (s) | |
647 | lang_input_statement_type *s; | |
648 | { | |
649 | const char *soname, *f; | |
650 | struct bfd_link_needed_list *l; | |
651 | ||
652 | if (global_vercheck_failed) | |
653 | return; | |
654 | if (s->the_bfd == NULL | |
655 | || (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0) | |
656 | return; | |
657 | ||
658 | soname = bfd_elf_get_dt_soname (s->the_bfd); | |
659 | if (soname == NULL) | |
660 | soname = bfd_get_filename (s->the_bfd); | |
661 | ||
662 | f = strrchr (soname, '/'); | |
663 | if (f != NULL) | |
664 | ++f; | |
665 | else | |
666 | f = soname; | |
667 | ||
668 | for (l = global_vercheck_needed; l != NULL; l = l->next) | |
669 | { | |
670 | const char *suffix; | |
671 | ||
672 | if (strcmp (f, l->name) == 0) | |
673 | { | |
674 | /* Probably can't happen, but it's an easy check. */ | |
675 | continue; | |
676 | } | |
677 | ||
678 | if (strchr (l->name, '/') != NULL) | |
679 | continue; | |
680 | ||
681 | suffix = strstr (l->name, ".so."); | |
682 | if (suffix == NULL) | |
683 | continue; | |
684 | ||
685 | suffix += sizeof ".so." - 1; | |
686 | ||
687 | if (strncmp (f, l->name, suffix - l->name) == 0) | |
688 | { | |
689 | /* Here we know that S is a dynamic object FOO.SO.VER1, and | |
690 | the object we are considering needs a dynamic object | |
691 | FOO.SO.VER2, and VER1 and VER2 are different. This | |
692 | appears to be a version mismatch, so we tell the caller | |
693 | to try a different version of this library. */ | |
694 | global_vercheck_failed = true; | |
695 | return; | |
696 | } | |
697 | } | |
698 | } | |
699 | ||
700 | /* This is called after the sections have been attached to output | |
701 | sections, but before any sizes or addresses have been set. */ | |
702 | ||
703 | static void | |
704 | gld${EMULATION_NAME}_before_allocation () | |
705 | { | |
706 | const char *rpath; | |
707 | asection *sinterp; | |
708 | ||
709 | /* If we are going to make any variable assignments, we need to let | |
710 | the ELF backend know about them in case the variables are | |
711 | referred to by dynamic objects. */ | |
712 | lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment); | |
713 | ||
714 | /* Let the ELF backend work out the sizes of any sections required | |
715 | by dynamic linking. */ | |
716 | rpath = command_line.rpath; | |
717 | if (rpath == NULL) | |
718 | rpath = (const char *) getenv ("LD_RUN_PATH"); | |
719 | if (! (bfd_elf${ELFSIZE}_size_dynamic_sections | |
720 | (output_bfd, command_line.soname, rpath, | |
721 | command_line.export_dynamic, command_line.filter_shlib, | |
722 | (const char * const *) command_line.auxiliary_filters, | |
723 | &link_info, &sinterp, lang_elf_version_info))) | |
724 | einfo ("%P%F: failed to set dynamic section sizes: %E\n"); | |
725 | ||
726 | /* Let the user override the dynamic linker we are using. */ | |
727 | if (command_line.interpreter != NULL | |
728 | && sinterp != NULL) | |
729 | { | |
730 | sinterp->contents = (bfd_byte *) command_line.interpreter; | |
731 | sinterp->_raw_size = strlen (command_line.interpreter) + 1; | |
732 | } | |
733 | ||
734 | /* Look for any sections named .gnu.warning. As a GNU extensions, | |
735 | we treat such sections as containing warning messages. We print | |
736 | out the warning message, and then zero out the section size so | |
737 | that it does not get copied into the output file. */ | |
738 | ||
739 | { | |
740 | LANG_FOR_EACH_INPUT_STATEMENT (is) | |
741 | { | |
742 | asection *s; | |
743 | bfd_size_type sz; | |
744 | char *msg; | |
745 | boolean ret; | |
746 | ||
747 | if (is->just_syms_flag) | |
748 | continue; | |
749 | ||
750 | s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning"); | |
751 | if (s == NULL) | |
752 | continue; | |
753 | ||
754 | sz = bfd_section_size (is->the_bfd, s); | |
755 | msg = xmalloc ((size_t) sz + 1); | |
756 | if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz)) | |
757 | einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n", | |
758 | is->the_bfd); | |
759 | msg[sz] = '\0'; | |
760 | ret = link_info.callbacks->warning (&link_info, msg, | |
761 | (const char *) NULL, | |
762 | is->the_bfd, (asection *) NULL, | |
763 | (bfd_vma) 0); | |
764 | ASSERT (ret); | |
765 | free (msg); | |
766 | ||
767 | /* Clobber the section size, so that we don't waste copying the | |
768 | warning into the output file. */ | |
769 | s->_raw_size = 0; | |
770 | } | |
771 | } | |
772 | } | |
773 | ||
774 | /* This is called by the before_allocation routine via | |
775 | lang_for_each_statement. It locates any assignment statements, and | |
776 | tells the ELF backend about them, in case they are assignments to | |
777 | symbols which are referred to by dynamic objects. */ | |
778 | ||
779 | static void | |
780 | gld${EMULATION_NAME}_find_statement_assignment (s) | |
781 | lang_statement_union_type *s; | |
782 | { | |
783 | if (s->header.type == lang_assignment_statement_enum) | |
784 | gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp); | |
785 | } | |
786 | ||
787 | /* Look through an expression for an assignment statement. */ | |
788 | ||
789 | static void | |
790 | gld${EMULATION_NAME}_find_exp_assignment (exp) | |
791 | etree_type *exp; | |
792 | { | |
793 | struct bfd_link_hash_entry *h; | |
794 | ||
795 | switch (exp->type.node_class) | |
796 | { | |
797 | case etree_provide: | |
798 | h = bfd_link_hash_lookup (link_info.hash, exp->assign.dst, | |
799 | false, false, false); | |
800 | if (h == NULL) | |
801 | break; | |
802 | ||
803 | /* We call record_link_assignment even if the symbol is defined. | |
804 | This is because if it is defined by a dynamic object, we | |
805 | actually want to use the value defined by the linker script, | |
806 | not the value from the dynamic object (because we are setting | |
807 | symbols like etext). If the symbol is defined by a regular | |
808 | object, then, as it happens, calling record_link_assignment | |
809 | will do no harm. */ | |
810 | ||
811 | /* Fall through. */ | |
812 | case etree_assign: | |
813 | if (strcmp (exp->assign.dst, ".") != 0) | |
814 | { | |
815 | if (! (bfd_elf${ELFSIZE}_record_link_assignment | |
816 | (output_bfd, &link_info, exp->assign.dst, | |
817 | exp->type.node_class == etree_provide ? true : false))) | |
818 | einfo ("%P%F: failed to record assignment to %s: %E\n", | |
819 | exp->assign.dst); | |
820 | } | |
821 | gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src); | |
822 | break; | |
823 | ||
824 | case etree_binary: | |
825 | gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs); | |
826 | gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs); | |
827 | break; | |
828 | ||
829 | case etree_trinary: | |
830 | gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond); | |
831 | gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs); | |
832 | gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs); | |
833 | break; | |
834 | ||
835 | case etree_unary: | |
836 | gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child); | |
837 | break; | |
838 | ||
839 | default: | |
840 | break; | |
841 | } | |
842 | } | |
843 | ||
844 | /* Place an orphan section. We use this to put random SHF_ALLOC | |
845 | sections in the right segment. */ | |
846 | ||
847 | static asection *hold_section; | |
848 | static lang_output_section_statement_type *hold_use; | |
849 | static lang_output_section_statement_type *hold_text; | |
850 | static lang_output_section_statement_type *hold_rodata; | |
851 | static lang_output_section_statement_type *hold_data; | |
852 | static lang_output_section_statement_type *hold_bss; | |
853 | static lang_output_section_statement_type *hold_rel; | |
854 | static lang_output_section_statement_type *hold_interp; | |
855 | ||
856 | /*ARGSUSED*/ | |
857 | static boolean | |
858 | gld${EMULATION_NAME}_place_orphan (file, s) | |
859 | lang_input_statement_type *file; | |
860 | asection *s; | |
861 | { | |
862 | lang_output_section_statement_type *place; | |
863 | asection *snew, **pps; | |
864 | lang_statement_list_type *old; | |
865 | lang_statement_list_type add; | |
866 | etree_type *address; | |
867 | const char *secname, *ps; | |
868 | const char *outsecname; | |
869 | lang_output_section_statement_type *os; | |
870 | ||
871 | if ((s->flags & SEC_ALLOC) == 0) | |
872 | return false; | |
873 | ||
874 | /* Look through the script to see where to place this section. */ | |
875 | hold_section = s; | |
876 | hold_use = NULL; | |
877 | lang_for_each_statement (gld${EMULATION_NAME}_place_section); | |
878 | ||
879 | if (hold_use != NULL) | |
880 | { | |
881 | /* We have already placed a section with this name. */ | |
882 | wild_doit (&hold_use->children, s, hold_use, file); | |
883 | return true; | |
884 | } | |
885 | ||
886 | secname = bfd_get_section_name (s->owner, s); | |
887 | ||
888 | /* If this is a final link, then always put .gnu.warning.SYMBOL | |
889 | sections into the .text section to get them out of the way. */ | |
890 | if (! link_info.shared | |
891 | && ! link_info.relocateable | |
892 | && strncmp (secname, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0 | |
893 | && hold_text != NULL) | |
894 | { | |
895 | wild_doit (&hold_text->children, s, hold_text, file); | |
896 | return true; | |
897 | } | |
898 | ||
899 | /* Decide which segment the section should go in based on the | |
900 | section name and section flags. We put loadable .note sections | |
901 | right after the .interp section, so that the PT_NOTE segment is | |
902 | stored right after the program headers where the OS can read it | |
903 | in the first page. */ | |
904 | place = NULL; | |
905 | if (s->flags & SEC_EXCLUDE) | |
906 | return false; | |
907 | else if ((s->flags & SEC_LOAD) != 0 | |
908 | && strncmp (secname, ".note", 4) == 0 | |
909 | && hold_interp != NULL) | |
910 | place = hold_interp; | |
911 | else if ((s->flags & SEC_HAS_CONTENTS) == 0 | |
912 | && hold_bss != NULL) | |
913 | place = hold_bss; | |
914 | else if ((s->flags & SEC_READONLY) == 0 | |
915 | && hold_data != NULL) | |
916 | place = hold_data; | |
917 | else if (strncmp (secname, ".rel", 4) == 0 | |
918 | && hold_rel != NULL) | |
919 | place = hold_rel; | |
920 | else if ((s->flags & SEC_CODE) == 0 | |
921 | && (s->flags & SEC_READONLY) != 0 | |
922 | && hold_rodata != NULL) | |
923 | place = hold_rodata; | |
924 | else if ((s->flags & SEC_READONLY) != 0 | |
925 | && hold_text != NULL) | |
926 | place = hold_text; | |
927 | if (place == NULL) | |
928 | return false; | |
929 | ||
930 | /* Choose a unique name for the section. This will be needed if the | |
931 | same section name appears in the input file with different | |
932 | loadable or allocateable characteristics. */ | |
933 | outsecname = secname; | |
934 | if (bfd_get_section_by_name (output_bfd, outsecname) != NULL) | |
935 | { | |
936 | unsigned int len; | |
937 | char *newname; | |
938 | unsigned int i; | |
939 | ||
940 | len = strlen (outsecname); | |
941 | newname = xmalloc (len + 5); | |
942 | strcpy (newname, outsecname); | |
943 | i = 0; | |
944 | do | |
945 | { | |
946 | sprintf (newname + len, "%d", i); | |
947 | ++i; | |
948 | } | |
949 | while (bfd_get_section_by_name (output_bfd, newname) != NULL); | |
950 | ||
951 | outsecname = newname; | |
952 | } | |
953 | ||
954 | /* Create the section in the output file, and put it in the right | |
955 | place. This shuffling is to make the output file look neater. */ | |
956 | snew = bfd_make_section (output_bfd, outsecname); | |
957 | if (snew == NULL) | |
958 | einfo ("%P%F: output format %s cannot represent section called %s\n", | |
959 | output_bfd->xvec->name, outsecname); | |
960 | if (place->bfd_section != NULL) | |
961 | { | |
962 | for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next) | |
963 | ; | |
964 | *pps = snew->next; | |
965 | snew->next = place->bfd_section->next; | |
966 | place->bfd_section->next = snew; | |
967 | } | |
968 | ||
969 | /* Start building a list of statements for this section. */ | |
970 | old = stat_ptr; | |
971 | stat_ptr = &add; | |
972 | lang_list_init (stat_ptr); | |
973 | ||
974 | /* If the name of the section is representable in C, then create | |
975 | symbols to mark the start and the end of the section. */ | |
976 | for (ps = outsecname; *ps != '\0'; ps++) | |
977 | if (! isalnum ((unsigned char) *ps) && *ps != '_') | |
978 | break; | |
979 | if (*ps == '\0' && config.build_constructors) | |
980 | { | |
981 | char *symname; | |
982 | ||
983 | symname = (char *) xmalloc (ps - outsecname + sizeof "__start_"); | |
984 | sprintf (symname, "__start_%s", outsecname); | |
985 | lang_add_assignment (exp_assop ('=', symname, | |
986 | exp_unop (ALIGN_K, | |
987 | exp_intop ((bfd_vma) 1 | |
988 | << s->alignment_power)))); | |
989 | } | |
990 | ||
991 | if (! link_info.relocateable) | |
992 | address = NULL; | |
993 | else | |
994 | address = exp_intop ((bfd_vma) 0); | |
995 | ||
996 | lang_enter_output_section_statement (outsecname, address, 0, | |
997 | (bfd_vma) 0, | |
998 | (etree_type *) NULL, | |
999 | (etree_type *) NULL, | |
1000 | (etree_type *) NULL); | |
1001 | ||
1002 | os = lang_output_section_statement_lookup (outsecname); | |
1003 | wild_doit (&os->children, s, os, file); | |
1004 | ||
1005 | lang_leave_output_section_statement | |
1006 | ((bfd_vma) 0, "*default*", (struct lang_output_section_phdr_list *) NULL); | |
1007 | stat_ptr = &add; | |
1008 | ||
1009 | if (*ps == '\0' && config.build_constructors) | |
1010 | { | |
1011 | char *symname; | |
1012 | ||
1013 | symname = (char *) xmalloc (ps - outsecname + sizeof "__stop_"); | |
1014 | sprintf (symname, "__stop_%s", outsecname); | |
1015 | lang_add_assignment (exp_assop ('=', symname, | |
1016 | exp_nameop (NAME, "."))); | |
1017 | } | |
1018 | ||
1019 | /* Now stick the new statement list right after PLACE. */ | |
1020 | *add.tail = place->header.next; | |
1021 | place->header.next = add.head; | |
1022 | ||
1023 | stat_ptr = old; | |
1024 | ||
1025 | return true; | |
1026 | } | |
1027 | ||
1028 | static void | |
1029 | gld${EMULATION_NAME}_place_section (s) | |
1030 | lang_statement_union_type *s; | |
1031 | { | |
1032 | lang_output_section_statement_type *os; | |
1033 | ||
1034 | if (s->header.type != lang_output_section_statement_enum) | |
1035 | return; | |
1036 | ||
1037 | os = &s->output_section_statement; | |
1038 | ||
1039 | if (strcmp (os->name, hold_section->name) == 0 | |
1040 | && os->bfd_section != NULL | |
1041 | && ((hold_section->flags & (SEC_LOAD | SEC_ALLOC)) | |
1042 | == (os->bfd_section->flags & (SEC_LOAD | SEC_ALLOC)))) | |
1043 | hold_use = os; | |
1044 | ||
1045 | if (strcmp (os->name, ".text") == 0) | |
1046 | hold_text = os; | |
1047 | else if (strcmp (os->name, ".rodata") == 0) | |
1048 | hold_rodata = os; | |
1049 | else if (strcmp (os->name, ".data") == 0) | |
1050 | hold_data = os; | |
1051 | else if (strcmp (os->name, ".bss") == 0) | |
1052 | hold_bss = os; | |
1053 | else if (hold_rel == NULL | |
1054 | && os->bfd_section != NULL | |
1055 | && (os->bfd_section->flags & SEC_ALLOC) != 0 | |
1056 | && strncmp (os->name, ".rel", 4) == 0) | |
1057 | hold_rel = os; | |
1058 | else if (strcmp (os->name, ".interp") == 0) | |
1059 | hold_interp = os; | |
1060 | } | |
1061 | ||
1062 | static char * | |
1063 | gld${EMULATION_NAME}_get_script(isfile) | |
1064 | int *isfile; | |
1065 | EOF | |
1066 | ||
1067 | if test -n "$COMPILE_IN" | |
1068 | then | |
1069 | # Scripts compiled in. | |
1070 | ||
1071 | # sed commands to quote an ld script as a C string. | |
1072 | sc='s/["\\]/\\&/g | |
1073 | s/$/\\n\\/ | |
1074 | 1s/^/"/ | |
1075 | $s/$/n"/ | |
1076 | ' | |
1077 | ||
1078 | cat >>e${EMULATION_NAME}.c <<EOF | |
1079 | { | |
1080 | *isfile = 0; | |
1081 | ||
1082 | if (link_info.relocateable == true && config.build_constructors == true) | |
1083 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`; | |
1084 | else if (link_info.relocateable == true) | |
1085 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`; | |
1086 | else if (!config.text_read_only) | |
1087 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`; | |
1088 | else if (!config.magic_demand_paged) | |
1089 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`; | |
1090 | EOF | |
1091 | ||
1092 | if test -n "$GENERATE_SHLIB_SCRIPT" ; then | |
1093 | cat >>e${EMULATION_NAME}.c <<EOF | |
1094 | else if (link_info.shared) | |
1095 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xs`; | |
1096 | EOF | |
1097 | fi | |
1098 | ||
1099 | cat >>e${EMULATION_NAME}.c <<EOF | |
1100 | else | |
1101 | return `sed "$sc" ldscripts/${EMULATION_NAME}.x`; | |
1102 | } | |
1103 | EOF | |
1104 | ||
1105 | else | |
1106 | # Scripts read from the filesystem. | |
1107 | ||
1108 | cat >>e${EMULATION_NAME}.c <<EOF | |
1109 | { | |
1110 | *isfile = 1; | |
1111 | ||
1112 | if (link_info.relocateable == true && config.build_constructors == true) | |
1113 | return "ldscripts/${EMULATION_NAME}.xu"; | |
1114 | else if (link_info.relocateable == true) | |
1115 | return "ldscripts/${EMULATION_NAME}.xr"; | |
1116 | else if (!config.text_read_only) | |
1117 | return "ldscripts/${EMULATION_NAME}.xbn"; | |
1118 | else if (!config.magic_demand_paged) | |
1119 | return "ldscripts/${EMULATION_NAME}.xn"; | |
1120 | else if (link_info.shared) | |
1121 | return "ldscripts/${EMULATION_NAME}.xs"; | |
1122 | else | |
1123 | return "ldscripts/${EMULATION_NAME}.x"; | |
1124 | } | |
1125 | EOF | |
1126 | ||
1127 | fi | |
1128 | ||
1129 | cat >>e${EMULATION_NAME}.c <<EOF | |
1130 | ||
1131 | struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = | |
1132 | { | |
1133 | gld${EMULATION_NAME}_before_parse, | |
1134 | syslib_default, | |
1135 | hll_default, | |
1136 | after_parse_default, | |
1137 | gld${EMULATION_NAME}_after_open, | |
1138 | after_allocation_default, | |
1139 | set_output_arch_default, | |
1140 | ldemul_default_target, | |
1141 | gld${EMULATION_NAME}_before_allocation, | |
1142 | gld${EMULATION_NAME}_get_script, | |
1143 | "${EMULATION_NAME}", | |
1144 | "${OUTPUT_FORMAT}", | |
1145 | NULL, | |
1146 | NULL, | |
1147 | gld${EMULATION_NAME}_open_dynamic_archive, | |
5d341b0e | 1148 | gld${EMULATION_NAME}_place_orphan, |
87f2a346 ILT |
1149 | NULL, /* set_symbols */ |
1150 | NULL, /* parse_args */ | |
1151 | NULL, /* unrecognized_file */ | |
1152 | NULL, /* list_options */ | |
1153 | NULL /* recognized_file */ | |
252b5132 RH |
1154 | }; |
1155 | EOF |