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1 | /* opncls.c -- open and close a BFD. | |
2 | Copyright (C) 1990-2020 Free Software Foundation, Inc. | |
3 | ||
4 | Written by Cygnus Support. | |
5 | ||
6 | This file is part of BFD, the Binary File Descriptor library. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | MA 02110-1301, USA. */ | |
22 | ||
23 | #include "sysdep.h" | |
24 | #include "bfd.h" | |
25 | #include "objalloc.h" | |
26 | #include "libbfd.h" | |
27 | #include "libiberty.h" | |
28 | #include "elf-bfd.h" | |
29 | ||
30 | #ifndef S_IXUSR | |
31 | #define S_IXUSR 0100 /* Execute by owner. */ | |
32 | #endif | |
33 | #ifndef S_IXGRP | |
34 | #define S_IXGRP 0010 /* Execute by group. */ | |
35 | #endif | |
36 | #ifndef S_IXOTH | |
37 | #define S_IXOTH 0001 /* Execute by others. */ | |
38 | #endif | |
39 | ||
40 | /* Counters used to initialize the bfd identifier. */ | |
41 | ||
42 | static unsigned int bfd_id_counter = 0; | |
43 | static unsigned int bfd_reserved_id_counter = 0; | |
44 | ||
45 | /* | |
46 | CODE_FRAGMENT | |
47 | .{* Set to N to open the next N BFDs using an alternate id space. *} | |
48 | .extern unsigned int bfd_use_reserved_id; | |
49 | */ | |
50 | unsigned int bfd_use_reserved_id = 0; | |
51 | ||
52 | /* fdopen is a loser -- we should use stdio exclusively. Unfortunately | |
53 | if we do that we can't use fcntl. */ | |
54 | ||
55 | /* Return a new BFD. All BFD's are allocated through this routine. */ | |
56 | ||
57 | bfd * | |
58 | _bfd_new_bfd (void) | |
59 | { | |
60 | bfd *nbfd; | |
61 | ||
62 | nbfd = (bfd *) bfd_zmalloc (sizeof (bfd)); | |
63 | if (nbfd == NULL) | |
64 | return NULL; | |
65 | ||
66 | if (bfd_use_reserved_id) | |
67 | { | |
68 | nbfd->id = --bfd_reserved_id_counter; | |
69 | --bfd_use_reserved_id; | |
70 | } | |
71 | else | |
72 | nbfd->id = bfd_id_counter++; | |
73 | ||
74 | nbfd->memory = objalloc_create (); | |
75 | if (nbfd->memory == NULL) | |
76 | { | |
77 | bfd_set_error (bfd_error_no_memory); | |
78 | free (nbfd); | |
79 | return NULL; | |
80 | } | |
81 | ||
82 | nbfd->arch_info = &bfd_default_arch_struct; | |
83 | ||
84 | if (!bfd_hash_table_init_n (& nbfd->section_htab, bfd_section_hash_newfunc, | |
85 | sizeof (struct section_hash_entry), 13)) | |
86 | { | |
87 | objalloc_free ((struct objalloc *) nbfd->memory); | |
88 | free (nbfd); | |
89 | return NULL; | |
90 | } | |
91 | ||
92 | return nbfd; | |
93 | } | |
94 | ||
95 | static const struct bfd_iovec opncls_iovec; | |
96 | ||
97 | /* Allocate a new BFD as a member of archive OBFD. */ | |
98 | ||
99 | bfd * | |
100 | _bfd_new_bfd_contained_in (bfd *obfd) | |
101 | { | |
102 | bfd *nbfd; | |
103 | ||
104 | nbfd = _bfd_new_bfd (); | |
105 | if (nbfd == NULL) | |
106 | return NULL; | |
107 | nbfd->xvec = obfd->xvec; | |
108 | nbfd->iovec = obfd->iovec; | |
109 | if (obfd->iovec == &opncls_iovec) | |
110 | nbfd->iostream = obfd->iostream; | |
111 | nbfd->my_archive = obfd; | |
112 | nbfd->direction = read_direction; | |
113 | nbfd->target_defaulted = obfd->target_defaulted; | |
114 | nbfd->lto_output = obfd->lto_output; | |
115 | nbfd->no_export = obfd->no_export; | |
116 | return nbfd; | |
117 | } | |
118 | ||
119 | /* Delete a BFD. */ | |
120 | ||
121 | static void | |
122 | _bfd_delete_bfd (bfd *abfd) | |
123 | { | |
124 | if (abfd->memory) | |
125 | { | |
126 | bfd_hash_table_free (&abfd->section_htab); | |
127 | objalloc_free ((struct objalloc *) abfd->memory); | |
128 | } | |
129 | else | |
130 | free ((char *) bfd_get_filename (abfd)); | |
131 | ||
132 | free (abfd->arelt_data); | |
133 | free (abfd); | |
134 | } | |
135 | ||
136 | /* Free objalloc memory. */ | |
137 | ||
138 | bfd_boolean | |
139 | _bfd_free_cached_info (bfd *abfd) | |
140 | { | |
141 | if (abfd->memory) | |
142 | { | |
143 | const char *filename = bfd_get_filename (abfd); | |
144 | if (filename) | |
145 | { | |
146 | /* We can't afford to lose the bfd filename when freeing | |
147 | abfd->memory, because that would kill the cache.c scheme | |
148 | of closing and reopening files in order to limit the | |
149 | number of open files. To reopen, you need the filename. | |
150 | And indeed _bfd_compute_and_write_armap calls | |
151 | _bfd_free_cached_info to free up space used by symbols | |
152 | and by check_format_matches. Which we want to continue | |
153 | doing to handle very large archives. Later the archive | |
154 | elements are copied, which might require reopening files. | |
155 | We also want to keep using objalloc memory for the | |
156 | filename since that allows the name to be updated | |
157 | without either leaking memory or implementing some sort | |
158 | of reference counted string for copies of the filename. */ | |
159 | size_t len = strlen (filename) + 1; | |
160 | char *copy = bfd_malloc (len); | |
161 | if (copy == NULL) | |
162 | return FALSE; | |
163 | memcpy (copy, filename, len); | |
164 | abfd->filename = copy; | |
165 | } | |
166 | bfd_hash_table_free (&abfd->section_htab); | |
167 | objalloc_free ((struct objalloc *) abfd->memory); | |
168 | ||
169 | abfd->sections = NULL; | |
170 | abfd->section_last = NULL; | |
171 | abfd->outsymbols = NULL; | |
172 | abfd->tdata.any = NULL; | |
173 | abfd->usrdata = NULL; | |
174 | abfd->memory = NULL; | |
175 | } | |
176 | ||
177 | return TRUE; | |
178 | } | |
179 | ||
180 | /* | |
181 | SECTION | |
182 | Opening and closing BFDs | |
183 | ||
184 | SUBSECTION | |
185 | Functions for opening and closing | |
186 | */ | |
187 | ||
188 | /* | |
189 | FUNCTION | |
190 | bfd_fopen | |
191 | ||
192 | SYNOPSIS | |
193 | bfd *bfd_fopen (const char *filename, const char *target, | |
194 | const char *mode, int fd); | |
195 | ||
196 | DESCRIPTION | |
197 | Open the file @var{filename} with the target @var{target}. | |
198 | Return a pointer to the created BFD. If @var{fd} is not -1, | |
199 | then <<fdopen>> is used to open the file; otherwise, <<fopen>> | |
200 | is used. @var{mode} is passed directly to <<fopen>> or | |
201 | <<fdopen>>. | |
202 | ||
203 | Calls <<bfd_find_target>>, so @var{target} is interpreted as by | |
204 | that function. | |
205 | ||
206 | The new BFD is marked as cacheable iff @var{fd} is -1. | |
207 | ||
208 | If <<NULL>> is returned then an error has occured. Possible errors | |
209 | are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or | |
210 | <<system_call>> error. | |
211 | ||
212 | On error, @var{fd} is always closed. | |
213 | ||
214 | A copy of the @var{filename} argument is stored in the newly created | |
215 | BFD. It can be accessed via the bfd_get_filename() macro. | |
216 | */ | |
217 | ||
218 | bfd * | |
219 | bfd_fopen (const char *filename, const char *target, const char *mode, int fd) | |
220 | { | |
221 | bfd *nbfd; | |
222 | const bfd_target *target_vec; | |
223 | ||
224 | nbfd = _bfd_new_bfd (); | |
225 | if (nbfd == NULL) | |
226 | { | |
227 | if (fd != -1) | |
228 | close (fd); | |
229 | return NULL; | |
230 | } | |
231 | ||
232 | target_vec = bfd_find_target (target, nbfd); | |
233 | if (target_vec == NULL) | |
234 | { | |
235 | if (fd != -1) | |
236 | close (fd); | |
237 | _bfd_delete_bfd (nbfd); | |
238 | return NULL; | |
239 | } | |
240 | ||
241 | #ifdef HAVE_FDOPEN | |
242 | if (fd != -1) | |
243 | nbfd->iostream = fdopen (fd, mode); | |
244 | else | |
245 | #endif | |
246 | nbfd->iostream = _bfd_real_fopen (filename, mode); | |
247 | if (nbfd->iostream == NULL) | |
248 | { | |
249 | bfd_set_error (bfd_error_system_call); | |
250 | if (fd != -1) | |
251 | close (fd); | |
252 | _bfd_delete_bfd (nbfd); | |
253 | return NULL; | |
254 | } | |
255 | ||
256 | /* OK, put everything where it belongs. */ | |
257 | ||
258 | /* PR 11983: Do not cache the original filename, but | |
259 | rather make a copy - the original might go away. */ | |
260 | if (!bfd_set_filename (nbfd, filename)) | |
261 | { | |
262 | fclose (nbfd->iostream); | |
263 | _bfd_delete_bfd (nbfd); | |
264 | return NULL; | |
265 | } | |
266 | ||
267 | /* Figure out whether the user is opening the file for reading, | |
268 | writing, or both, by looking at the MODE argument. */ | |
269 | if ((mode[0] == 'r' || mode[0] == 'w' || mode[0] == 'a') | |
270 | && mode[1] == '+') | |
271 | nbfd->direction = both_direction; | |
272 | else if (mode[0] == 'r') | |
273 | nbfd->direction = read_direction; | |
274 | else | |
275 | nbfd->direction = write_direction; | |
276 | ||
277 | if (!bfd_cache_init (nbfd)) | |
278 | { | |
279 | fclose (nbfd->iostream); | |
280 | _bfd_delete_bfd (nbfd); | |
281 | return NULL; | |
282 | } | |
283 | nbfd->opened_once = TRUE; | |
284 | ||
285 | /* If we opened the file by name, mark it cacheable; we can close it | |
286 | and reopen it later. However, if a file descriptor was provided, | |
287 | then it may have been opened with special flags that make it | |
288 | unsafe to close and reopen the file. */ | |
289 | if (fd == -1) | |
290 | (void) bfd_set_cacheable (nbfd, TRUE); | |
291 | ||
292 | return nbfd; | |
293 | } | |
294 | ||
295 | /* | |
296 | FUNCTION | |
297 | bfd_openr | |
298 | ||
299 | SYNOPSIS | |
300 | bfd *bfd_openr (const char *filename, const char *target); | |
301 | ||
302 | DESCRIPTION | |
303 | Open the file @var{filename} (using <<fopen>>) with the target | |
304 | @var{target}. Return a pointer to the created BFD. | |
305 | ||
306 | Calls <<bfd_find_target>>, so @var{target} is interpreted as by | |
307 | that function. | |
308 | ||
309 | If <<NULL>> is returned then an error has occured. Possible errors | |
310 | are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or | |
311 | <<system_call>> error. | |
312 | ||
313 | A copy of the @var{filename} argument is stored in the newly created | |
314 | BFD. It can be accessed via the bfd_get_filename() macro. | |
315 | */ | |
316 | ||
317 | bfd * | |
318 | bfd_openr (const char *filename, const char *target) | |
319 | { | |
320 | return bfd_fopen (filename, target, FOPEN_RB, -1); | |
321 | } | |
322 | ||
323 | /* Don't try to `optimize' this function: | |
324 | ||
325 | o - We lock using stack space so that interrupting the locking | |
326 | won't cause a storage leak. | |
327 | o - We open the file stream last, since we don't want to have to | |
328 | close it if anything goes wrong. Closing the stream means closing | |
329 | the file descriptor too, even though we didn't open it. */ | |
330 | /* | |
331 | FUNCTION | |
332 | bfd_fdopenr | |
333 | ||
334 | SYNOPSIS | |
335 | bfd *bfd_fdopenr (const char *filename, const char *target, int fd); | |
336 | ||
337 | DESCRIPTION | |
338 | <<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to | |
339 | <<fopen>>. It opens a BFD on a file already described by the | |
340 | @var{fd} supplied. | |
341 | ||
342 | When the file is later <<bfd_close>>d, the file descriptor will | |
343 | be closed. If the caller desires that this file descriptor be | |
344 | cached by BFD (opened as needed, closed as needed to free | |
345 | descriptors for other opens), with the supplied @var{fd} used as | |
346 | an initial file descriptor (but subject to closure at any time), | |
347 | call bfd_set_cacheable(bfd, 1) on the returned BFD. The default | |
348 | is to assume no caching; the file descriptor will remain open | |
349 | until <<bfd_close>>, and will not be affected by BFD operations | |
350 | on other files. | |
351 | ||
352 | Possible errors are <<bfd_error_no_memory>>, | |
353 | <<bfd_error_invalid_target>> and <<bfd_error_system_call>>. | |
354 | ||
355 | On error, @var{fd} is closed. | |
356 | ||
357 | A copy of the @var{filename} argument is stored in the newly created | |
358 | BFD. It can be accessed via the bfd_get_filename() macro. | |
359 | */ | |
360 | ||
361 | bfd * | |
362 | bfd_fdopenr (const char *filename, const char *target, int fd) | |
363 | { | |
364 | const char *mode; | |
365 | #if defined(HAVE_FCNTL) && defined(F_GETFL) | |
366 | int fdflags; | |
367 | #endif | |
368 | ||
369 | #if ! defined(HAVE_FCNTL) || ! defined(F_GETFL) | |
370 | mode = FOPEN_RUB; /* Assume full access. */ | |
371 | #else | |
372 | fdflags = fcntl (fd, F_GETFL, NULL); | |
373 | if (fdflags == -1) | |
374 | { | |
375 | int save = errno; | |
376 | ||
377 | close (fd); | |
378 | errno = save; | |
379 | bfd_set_error (bfd_error_system_call); | |
380 | return NULL; | |
381 | } | |
382 | ||
383 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ | |
384 | switch (fdflags & (O_ACCMODE)) | |
385 | { | |
386 | case O_RDONLY: mode = FOPEN_RB; break; | |
387 | case O_WRONLY: mode = FOPEN_RUB; break; | |
388 | case O_RDWR: mode = FOPEN_RUB; break; | |
389 | default: abort (); | |
390 | } | |
391 | #endif | |
392 | ||
393 | return bfd_fopen (filename, target, mode, fd); | |
394 | } | |
395 | ||
396 | /* | |
397 | FUNCTION | |
398 | bfd_openstreamr | |
399 | ||
400 | SYNOPSIS | |
401 | bfd *bfd_openstreamr (const char * filename, const char * target, | |
402 | void * stream); | |
403 | ||
404 | DESCRIPTION | |
405 | Open a BFD for read access on an existing stdio stream. When | |
406 | the BFD is passed to <<bfd_close>>, the stream will be closed. | |
407 | ||
408 | A copy of the @var{filename} argument is stored in the newly created | |
409 | BFD. It can be accessed via the bfd_get_filename() macro. | |
410 | */ | |
411 | ||
412 | bfd * | |
413 | bfd_openstreamr (const char *filename, const char *target, void *streamarg) | |
414 | { | |
415 | FILE *stream = (FILE *) streamarg; | |
416 | bfd *nbfd; | |
417 | const bfd_target *target_vec; | |
418 | ||
419 | nbfd = _bfd_new_bfd (); | |
420 | if (nbfd == NULL) | |
421 | return NULL; | |
422 | ||
423 | target_vec = bfd_find_target (target, nbfd); | |
424 | if (target_vec == NULL) | |
425 | { | |
426 | _bfd_delete_bfd (nbfd); | |
427 | return NULL; | |
428 | } | |
429 | ||
430 | nbfd->iostream = stream; | |
431 | /* PR 11983: Do not cache the original filename, but | |
432 | rather make a copy - the original might go away. */ | |
433 | if (!bfd_set_filename (nbfd, filename)) | |
434 | { | |
435 | _bfd_delete_bfd (nbfd); | |
436 | return NULL; | |
437 | } | |
438 | nbfd->direction = read_direction; | |
439 | ||
440 | if (! bfd_cache_init (nbfd)) | |
441 | { | |
442 | _bfd_delete_bfd (nbfd); | |
443 | return NULL; | |
444 | } | |
445 | ||
446 | return nbfd; | |
447 | } | |
448 | ||
449 | /* | |
450 | FUNCTION | |
451 | bfd_openr_iovec | |
452 | ||
453 | SYNOPSIS | |
454 | bfd *bfd_openr_iovec (const char *filename, const char *target, | |
455 | void *(*open_func) (struct bfd *nbfd, | |
456 | void *open_closure), | |
457 | void *open_closure, | |
458 | file_ptr (*pread_func) (struct bfd *nbfd, | |
459 | void *stream, | |
460 | void *buf, | |
461 | file_ptr nbytes, | |
462 | file_ptr offset), | |
463 | int (*close_func) (struct bfd *nbfd, | |
464 | void *stream), | |
465 | int (*stat_func) (struct bfd *abfd, | |
466 | void *stream, | |
467 | struct stat *sb)); | |
468 | ||
469 | DESCRIPTION | |
470 | Create and return a BFD backed by a read-only @var{stream}. | |
471 | The @var{stream} is created using @var{open_func}, accessed using | |
472 | @var{pread_func} and destroyed using @var{close_func}. | |
473 | ||
474 | Calls <<bfd_find_target>>, so @var{target} is interpreted as by | |
475 | that function. | |
476 | ||
477 | Calls @var{open_func} (which can call <<bfd_zalloc>> and | |
478 | <<bfd_get_filename>>) to obtain the read-only stream backing | |
479 | the BFD. @var{open_func} either succeeds returning the | |
480 | non-<<NULL>> @var{stream}, or fails returning <<NULL>> | |
481 | (setting <<bfd_error>>). | |
482 | ||
483 | Calls @var{pread_func} to request @var{nbytes} of data from | |
484 | @var{stream} starting at @var{offset} (e.g., via a call to | |
485 | <<bfd_read>>). @var{pread_func} either succeeds returning the | |
486 | number of bytes read (which can be less than @var{nbytes} when | |
487 | end-of-file), or fails returning -1 (setting <<bfd_error>>). | |
488 | ||
489 | Calls @var{close_func} when the BFD is later closed using | |
490 | <<bfd_close>>. @var{close_func} either succeeds returning 0, or | |
491 | fails returning -1 (setting <<bfd_error>>). | |
492 | ||
493 | Calls @var{stat_func} to fill in a stat structure for bfd_stat, | |
494 | bfd_get_size, and bfd_get_mtime calls. @var{stat_func} returns 0 | |
495 | on success, or returns -1 on failure (setting <<bfd_error>>). | |
496 | ||
497 | If <<bfd_openr_iovec>> returns <<NULL>> then an error has | |
498 | occurred. Possible errors are <<bfd_error_no_memory>>, | |
499 | <<bfd_error_invalid_target>> and <<bfd_error_system_call>>. | |
500 | ||
501 | A copy of the @var{filename} argument is stored in the newly created | |
502 | BFD. It can be accessed via the bfd_get_filename() macro. | |
503 | */ | |
504 | ||
505 | struct opncls | |
506 | { | |
507 | void *stream; | |
508 | file_ptr (*pread) (struct bfd *abfd, void *stream, void *buf, | |
509 | file_ptr nbytes, file_ptr offset); | |
510 | int (*close) (struct bfd *abfd, void *stream); | |
511 | int (*stat) (struct bfd *abfd, void *stream, struct stat *sb); | |
512 | file_ptr where; | |
513 | }; | |
514 | ||
515 | static file_ptr | |
516 | opncls_btell (struct bfd *abfd) | |
517 | { | |
518 | struct opncls *vec = (struct opncls *) abfd->iostream; | |
519 | return vec->where; | |
520 | } | |
521 | ||
522 | static int | |
523 | opncls_bseek (struct bfd *abfd, file_ptr offset, int whence) | |
524 | { | |
525 | struct opncls *vec = (struct opncls *) abfd->iostream; | |
526 | switch (whence) | |
527 | { | |
528 | case SEEK_SET: vec->where = offset; break; | |
529 | case SEEK_CUR: vec->where += offset; break; | |
530 | case SEEK_END: return -1; | |
531 | } | |
532 | return 0; | |
533 | } | |
534 | ||
535 | static file_ptr | |
536 | opncls_bread (struct bfd *abfd, void *buf, file_ptr nbytes) | |
537 | { | |
538 | struct opncls *vec = (struct opncls *) abfd->iostream; | |
539 | file_ptr nread = (vec->pread) (abfd, vec->stream, buf, nbytes, vec->where); | |
540 | ||
541 | if (nread < 0) | |
542 | return nread; | |
543 | vec->where += nread; | |
544 | return nread; | |
545 | } | |
546 | ||
547 | static file_ptr | |
548 | opncls_bwrite (struct bfd *abfd ATTRIBUTE_UNUSED, | |
549 | const void *where ATTRIBUTE_UNUSED, | |
550 | file_ptr nbytes ATTRIBUTE_UNUSED) | |
551 | { | |
552 | return -1; | |
553 | } | |
554 | ||
555 | static int | |
556 | opncls_bclose (struct bfd *abfd) | |
557 | { | |
558 | struct opncls *vec = (struct opncls *) abfd->iostream; | |
559 | /* Since the VEC's memory is bound to the bfd deleting the bfd will | |
560 | free it. */ | |
561 | int status = 0; | |
562 | ||
563 | if (vec->close != NULL) | |
564 | status = (vec->close) (abfd, vec->stream); | |
565 | abfd->iostream = NULL; | |
566 | return status; | |
567 | } | |
568 | ||
569 | static int | |
570 | opncls_bflush (struct bfd *abfd ATTRIBUTE_UNUSED) | |
571 | { | |
572 | return 0; | |
573 | } | |
574 | ||
575 | static int | |
576 | opncls_bstat (struct bfd *abfd, struct stat *sb) | |
577 | { | |
578 | struct opncls *vec = (struct opncls *) abfd->iostream; | |
579 | ||
580 | memset (sb, 0, sizeof (*sb)); | |
581 | if (vec->stat == NULL) | |
582 | return 0; | |
583 | ||
584 | return (vec->stat) (abfd, vec->stream, sb); | |
585 | } | |
586 | ||
587 | static void * | |
588 | opncls_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED, | |
589 | void *addr ATTRIBUTE_UNUSED, | |
590 | bfd_size_type len ATTRIBUTE_UNUSED, | |
591 | int prot ATTRIBUTE_UNUSED, | |
592 | int flags ATTRIBUTE_UNUSED, | |
593 | file_ptr offset ATTRIBUTE_UNUSED, | |
594 | void **map_addr ATTRIBUTE_UNUSED, | |
595 | bfd_size_type *map_len ATTRIBUTE_UNUSED) | |
596 | { | |
597 | return (void *) -1; | |
598 | } | |
599 | ||
600 | static const struct bfd_iovec opncls_iovec = | |
601 | { | |
602 | &opncls_bread, &opncls_bwrite, &opncls_btell, &opncls_bseek, | |
603 | &opncls_bclose, &opncls_bflush, &opncls_bstat, &opncls_bmmap | |
604 | }; | |
605 | ||
606 | bfd * | |
607 | bfd_openr_iovec (const char *filename, const char *target, | |
608 | void *(*open_p) (struct bfd *, void *), | |
609 | void *open_closure, | |
610 | file_ptr (*pread_p) (struct bfd *, void *, void *, | |
611 | file_ptr, file_ptr), | |
612 | int (*close_p) (struct bfd *, void *), | |
613 | int (*stat_p) (struct bfd *, void *, struct stat *)) | |
614 | { | |
615 | bfd *nbfd; | |
616 | const bfd_target *target_vec; | |
617 | struct opncls *vec; | |
618 | void *stream; | |
619 | ||
620 | nbfd = _bfd_new_bfd (); | |
621 | if (nbfd == NULL) | |
622 | return NULL; | |
623 | ||
624 | target_vec = bfd_find_target (target, nbfd); | |
625 | if (target_vec == NULL) | |
626 | { | |
627 | _bfd_delete_bfd (nbfd); | |
628 | return NULL; | |
629 | } | |
630 | ||
631 | /* PR 11983: Do not cache the original filename, but | |
632 | rather make a copy - the original might go away. */ | |
633 | if (!bfd_set_filename (nbfd, filename)) | |
634 | { | |
635 | _bfd_delete_bfd (nbfd); | |
636 | return NULL; | |
637 | } | |
638 | nbfd->direction = read_direction; | |
639 | ||
640 | /* `open_p (...)' would get expanded by an the open(2) syscall macro. */ | |
641 | stream = (*open_p) (nbfd, open_closure); | |
642 | if (stream == NULL) | |
643 | { | |
644 | _bfd_delete_bfd (nbfd); | |
645 | return NULL; | |
646 | } | |
647 | ||
648 | vec = (struct opncls *) bfd_zalloc (nbfd, sizeof (struct opncls)); | |
649 | vec->stream = stream; | |
650 | vec->pread = pread_p; | |
651 | vec->close = close_p; | |
652 | vec->stat = stat_p; | |
653 | ||
654 | nbfd->iovec = &opncls_iovec; | |
655 | nbfd->iostream = vec; | |
656 | ||
657 | return nbfd; | |
658 | } | |
659 | \f | |
660 | /* bfd_openw -- open for writing. | |
661 | Returns a pointer to a freshly-allocated BFD on success, or NULL. | |
662 | ||
663 | See comment by bfd_fdopenr before you try to modify this function. */ | |
664 | ||
665 | /* | |
666 | FUNCTION | |
667 | bfd_openw | |
668 | ||
669 | SYNOPSIS | |
670 | bfd *bfd_openw (const char *filename, const char *target); | |
671 | ||
672 | DESCRIPTION | |
673 | Create a BFD, associated with file @var{filename}, using the | |
674 | file format @var{target}, and return a pointer to it. | |
675 | ||
676 | Possible errors are <<bfd_error_system_call>>, <<bfd_error_no_memory>>, | |
677 | <<bfd_error_invalid_target>>. | |
678 | ||
679 | A copy of the @var{filename} argument is stored in the newly created | |
680 | BFD. It can be accessed via the bfd_get_filename() macro. | |
681 | */ | |
682 | ||
683 | bfd * | |
684 | bfd_openw (const char *filename, const char *target) | |
685 | { | |
686 | bfd *nbfd; | |
687 | const bfd_target *target_vec; | |
688 | ||
689 | /* nbfd has to point to head of malloc'ed block so that bfd_close may | |
690 | reclaim it correctly. */ | |
691 | nbfd = _bfd_new_bfd (); | |
692 | if (nbfd == NULL) | |
693 | return NULL; | |
694 | ||
695 | target_vec = bfd_find_target (target, nbfd); | |
696 | if (target_vec == NULL) | |
697 | { | |
698 | _bfd_delete_bfd (nbfd); | |
699 | return NULL; | |
700 | } | |
701 | ||
702 | /* PR 11983: Do not cache the original filename, but | |
703 | rather make a copy - the original might go away. */ | |
704 | if (!bfd_set_filename (nbfd, filename)) | |
705 | { | |
706 | _bfd_delete_bfd (nbfd); | |
707 | return NULL; | |
708 | } | |
709 | nbfd->direction = write_direction; | |
710 | ||
711 | if (bfd_open_file (nbfd) == NULL) | |
712 | { | |
713 | /* File not writeable, etc. */ | |
714 | bfd_set_error (bfd_error_system_call); | |
715 | _bfd_delete_bfd (nbfd); | |
716 | return NULL; | |
717 | } | |
718 | ||
719 | return nbfd; | |
720 | } | |
721 | ||
722 | static inline void | |
723 | _maybe_make_executable (bfd * abfd) | |
724 | { | |
725 | /* If the file was open for writing and is now executable, | |
726 | make it so. */ | |
727 | if (abfd->direction == write_direction | |
728 | && (abfd->flags & (EXEC_P | DYNAMIC)) != 0) | |
729 | { | |
730 | struct stat buf; | |
731 | ||
732 | if (stat (bfd_get_filename (abfd), &buf) == 0 | |
733 | /* Do not attempt to change non-regular files. This is | |
734 | here especially for configure scripts and kernel builds | |
735 | which run tests with "ld [...] -o /dev/null". */ | |
736 | && S_ISREG(buf.st_mode)) | |
737 | { | |
738 | unsigned int mask = umask (0); | |
739 | ||
740 | umask (mask); | |
741 | chmod (bfd_get_filename (abfd), | |
742 | (0777 | |
743 | & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask)))); | |
744 | } | |
745 | } | |
746 | } | |
747 | ||
748 | /* | |
749 | FUNCTION | |
750 | bfd_close | |
751 | ||
752 | SYNOPSIS | |
753 | bfd_boolean bfd_close (bfd *abfd); | |
754 | ||
755 | DESCRIPTION | |
756 | Close a BFD. If the BFD was open for writing, then pending | |
757 | operations are completed and the file written out and closed. | |
758 | If the created file is executable, then <<chmod>> is called | |
759 | to mark it as such. | |
760 | ||
761 | All memory attached to the BFD is released. | |
762 | ||
763 | The file descriptor associated with the BFD is closed (even | |
764 | if it was passed in to BFD by <<bfd_fdopenr>>). | |
765 | ||
766 | RETURNS | |
767 | <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. | |
768 | */ | |
769 | ||
770 | bfd_boolean | |
771 | bfd_close (bfd *abfd) | |
772 | { | |
773 | if (bfd_write_p (abfd)) | |
774 | { | |
775 | if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd))) | |
776 | return FALSE; | |
777 | } | |
778 | ||
779 | return bfd_close_all_done (abfd); | |
780 | } | |
781 | ||
782 | /* | |
783 | FUNCTION | |
784 | bfd_close_all_done | |
785 | ||
786 | SYNOPSIS | |
787 | bfd_boolean bfd_close_all_done (bfd *); | |
788 | ||
789 | DESCRIPTION | |
790 | Close a BFD. Differs from <<bfd_close>> since it does not | |
791 | complete any pending operations. This routine would be used | |
792 | if the application had just used BFD for swapping and didn't | |
793 | want to use any of the writing code. | |
794 | ||
795 | If the created file is executable, then <<chmod>> is called | |
796 | to mark it as such. | |
797 | ||
798 | All memory attached to the BFD is released. | |
799 | ||
800 | RETURNS | |
801 | <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. | |
802 | */ | |
803 | ||
804 | bfd_boolean | |
805 | bfd_close_all_done (bfd *abfd) | |
806 | { | |
807 | bfd_boolean ret; | |
808 | ||
809 | if (! BFD_SEND (abfd, _close_and_cleanup, (abfd))) | |
810 | return FALSE; | |
811 | ||
812 | ret = abfd->iovec->bclose (abfd) == 0; | |
813 | ||
814 | if (ret) | |
815 | _maybe_make_executable (abfd); | |
816 | ||
817 | _bfd_delete_bfd (abfd); | |
818 | ||
819 | return ret; | |
820 | } | |
821 | ||
822 | /* | |
823 | FUNCTION | |
824 | bfd_create | |
825 | ||
826 | SYNOPSIS | |
827 | bfd *bfd_create (const char *filename, bfd *templ); | |
828 | ||
829 | DESCRIPTION | |
830 | Create a new BFD in the manner of <<bfd_openw>>, but without | |
831 | opening a file. The new BFD takes the target from the target | |
832 | used by @var{templ}. The format is always set to <<bfd_object>>. | |
833 | ||
834 | A copy of the @var{filename} argument is stored in the newly created | |
835 | BFD. It can be accessed via the bfd_get_filename() macro. | |
836 | */ | |
837 | ||
838 | bfd * | |
839 | bfd_create (const char *filename, bfd *templ) | |
840 | { | |
841 | bfd *nbfd; | |
842 | ||
843 | nbfd = _bfd_new_bfd (); | |
844 | if (nbfd == NULL) | |
845 | return NULL; | |
846 | /* PR 11983: Do not cache the original filename, but | |
847 | rather make a copy - the original might go away. */ | |
848 | if (!bfd_set_filename (nbfd, filename)) | |
849 | { | |
850 | _bfd_delete_bfd (nbfd); | |
851 | return NULL; | |
852 | } | |
853 | if (templ) | |
854 | nbfd->xvec = templ->xvec; | |
855 | nbfd->direction = no_direction; | |
856 | bfd_set_format (nbfd, bfd_object); | |
857 | ||
858 | return nbfd; | |
859 | } | |
860 | ||
861 | /* | |
862 | FUNCTION | |
863 | bfd_make_writable | |
864 | ||
865 | SYNOPSIS | |
866 | bfd_boolean bfd_make_writable (bfd *abfd); | |
867 | ||
868 | DESCRIPTION | |
869 | Takes a BFD as created by <<bfd_create>> and converts it | |
870 | into one like as returned by <<bfd_openw>>. It does this | |
871 | by converting the BFD to BFD_IN_MEMORY. It's assumed that | |
872 | you will call <<bfd_make_readable>> on this bfd later. | |
873 | ||
874 | RETURNS | |
875 | <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. | |
876 | */ | |
877 | ||
878 | bfd_boolean | |
879 | bfd_make_writable (bfd *abfd) | |
880 | { | |
881 | struct bfd_in_memory *bim; | |
882 | ||
883 | if (abfd->direction != no_direction) | |
884 | { | |
885 | bfd_set_error (bfd_error_invalid_operation); | |
886 | return FALSE; | |
887 | } | |
888 | ||
889 | bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory)); | |
890 | if (bim == NULL) | |
891 | return FALSE; /* bfd_error already set. */ | |
892 | abfd->iostream = bim; | |
893 | /* bfd_bwrite will grow these as needed. */ | |
894 | bim->size = 0; | |
895 | bim->buffer = 0; | |
896 | ||
897 | abfd->flags |= BFD_IN_MEMORY; | |
898 | abfd->iovec = &_bfd_memory_iovec; | |
899 | abfd->origin = 0; | |
900 | abfd->direction = write_direction; | |
901 | abfd->where = 0; | |
902 | ||
903 | return TRUE; | |
904 | } | |
905 | ||
906 | /* | |
907 | FUNCTION | |
908 | bfd_make_readable | |
909 | ||
910 | SYNOPSIS | |
911 | bfd_boolean bfd_make_readable (bfd *abfd); | |
912 | ||
913 | DESCRIPTION | |
914 | Takes a BFD as created by <<bfd_create>> and | |
915 | <<bfd_make_writable>> and converts it into one like as | |
916 | returned by <<bfd_openr>>. It does this by writing the | |
917 | contents out to the memory buffer, then reversing the | |
918 | direction. | |
919 | ||
920 | RETURNS | |
921 | <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. */ | |
922 | ||
923 | bfd_boolean | |
924 | bfd_make_readable (bfd *abfd) | |
925 | { | |
926 | if (abfd->direction != write_direction || !(abfd->flags & BFD_IN_MEMORY)) | |
927 | { | |
928 | bfd_set_error (bfd_error_invalid_operation); | |
929 | return FALSE; | |
930 | } | |
931 | ||
932 | if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd))) | |
933 | return FALSE; | |
934 | ||
935 | if (! BFD_SEND (abfd, _close_and_cleanup, (abfd))) | |
936 | return FALSE; | |
937 | ||
938 | abfd->arch_info = &bfd_default_arch_struct; | |
939 | ||
940 | abfd->where = 0; | |
941 | abfd->format = bfd_unknown; | |
942 | abfd->my_archive = NULL; | |
943 | abfd->origin = 0; | |
944 | abfd->opened_once = FALSE; | |
945 | abfd->output_has_begun = FALSE; | |
946 | abfd->section_count = 0; | |
947 | abfd->usrdata = NULL; | |
948 | abfd->cacheable = FALSE; | |
949 | abfd->flags |= BFD_IN_MEMORY; | |
950 | abfd->mtime_set = FALSE; | |
951 | ||
952 | abfd->target_defaulted = TRUE; | |
953 | abfd->direction = read_direction; | |
954 | abfd->sections = 0; | |
955 | abfd->symcount = 0; | |
956 | abfd->outsymbols = 0; | |
957 | abfd->tdata.any = 0; | |
958 | ||
959 | bfd_section_list_clear (abfd); | |
960 | bfd_check_format (abfd, bfd_object); | |
961 | ||
962 | return TRUE; | |
963 | } | |
964 | ||
965 | /* | |
966 | FUNCTION | |
967 | bfd_alloc | |
968 | ||
969 | SYNOPSIS | |
970 | void *bfd_alloc (bfd *abfd, bfd_size_type wanted); | |
971 | ||
972 | DESCRIPTION | |
973 | Allocate a block of @var{wanted} bytes of memory attached to | |
974 | <<abfd>> and return a pointer to it. | |
975 | */ | |
976 | ||
977 | void * | |
978 | bfd_alloc (bfd *abfd, bfd_size_type size) | |
979 | { | |
980 | void *ret; | |
981 | unsigned long ul_size = (unsigned long) size; | |
982 | ||
983 | if (size != ul_size | |
984 | /* Note - although objalloc_alloc takes an unsigned long as its | |
985 | argument, internally the size is treated as a signed long. This can | |
986 | lead to problems where, for example, a request to allocate -1 bytes | |
987 | can result in just 1 byte being allocated, rather than | |
988 | ((unsigned long) -1) bytes. Also memory checkers will often | |
989 | complain about attempts to allocate a negative amount of memory. | |
990 | So to stop these problems we fail if the size is negative. */ | |
991 | || ((signed long) ul_size) < 0) | |
992 | { | |
993 | bfd_set_error (bfd_error_no_memory); | |
994 | return NULL; | |
995 | } | |
996 | ||
997 | ret = objalloc_alloc ((struct objalloc *) abfd->memory, ul_size); | |
998 | if (ret == NULL) | |
999 | bfd_set_error (bfd_error_no_memory); | |
1000 | return ret; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | FUNCTION | |
1005 | bfd_zalloc | |
1006 | ||
1007 | SYNOPSIS | |
1008 | void *bfd_zalloc (bfd *abfd, bfd_size_type wanted); | |
1009 | ||
1010 | DESCRIPTION | |
1011 | Allocate a block of @var{wanted} bytes of zeroed memory | |
1012 | attached to <<abfd>> and return a pointer to it. | |
1013 | */ | |
1014 | ||
1015 | void * | |
1016 | bfd_zalloc (bfd *abfd, bfd_size_type size) | |
1017 | { | |
1018 | void *res; | |
1019 | ||
1020 | res = bfd_alloc (abfd, size); | |
1021 | if (res) | |
1022 | memset (res, 0, (size_t) size); | |
1023 | return res; | |
1024 | } | |
1025 | ||
1026 | /* Free a block allocated for a BFD. | |
1027 | Note: Also frees all more recently allocated blocks! */ | |
1028 | ||
1029 | void | |
1030 | bfd_release (bfd *abfd, void *block) | |
1031 | { | |
1032 | objalloc_free_block ((struct objalloc *) abfd->memory, block); | |
1033 | } | |
1034 | ||
1035 | ||
1036 | /* | |
1037 | GNU Extension: separate debug-info files | |
1038 | ||
1039 | The idea here is that a special section called .gnu_debuglink might be | |
1040 | embedded in a binary file, which indicates that some *other* file | |
1041 | contains the real debugging information. This special section contains a | |
1042 | filename and CRC32 checksum, which we read and resolve to another file, | |
1043 | if it exists. | |
1044 | ||
1045 | This facilitates "optional" provision of debugging information, without | |
1046 | having to provide two complete copies of every binary object (with and | |
1047 | without debug symbols). */ | |
1048 | ||
1049 | #define GNU_DEBUGLINK ".gnu_debuglink" | |
1050 | #define GNU_DEBUGALTLINK ".gnu_debugaltlink" | |
1051 | ||
1052 | /* | |
1053 | FUNCTION | |
1054 | bfd_calc_gnu_debuglink_crc32 | |
1055 | ||
1056 | SYNOPSIS | |
1057 | unsigned long bfd_calc_gnu_debuglink_crc32 | |
1058 | (unsigned long crc, const unsigned char *buf, bfd_size_type len); | |
1059 | ||
1060 | DESCRIPTION | |
1061 | Computes a CRC value as used in the .gnu_debuglink section. | |
1062 | Advances the previously computed @var{crc} value by computing | |
1063 | and adding in the crc32 for @var{len} bytes of @var{buf}. | |
1064 | ||
1065 | RETURNS | |
1066 | Return the updated CRC32 value. | |
1067 | */ | |
1068 | ||
1069 | unsigned long | |
1070 | bfd_calc_gnu_debuglink_crc32 (unsigned long crc, | |
1071 | const unsigned char *buf, | |
1072 | bfd_size_type len) | |
1073 | { | |
1074 | static const unsigned long crc32_table[256] = | |
1075 | { | |
1076 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, | |
1077 | 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, | |
1078 | 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, | |
1079 | 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, | |
1080 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, | |
1081 | 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, | |
1082 | 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, | |
1083 | 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, | |
1084 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, | |
1085 | 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, | |
1086 | 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, | |
1087 | 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, | |
1088 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, | |
1089 | 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, | |
1090 | 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, | |
1091 | 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, | |
1092 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, | |
1093 | 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, | |
1094 | 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, | |
1095 | 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, | |
1096 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, | |
1097 | 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, | |
1098 | 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, | |
1099 | 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, | |
1100 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, | |
1101 | 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, | |
1102 | 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, | |
1103 | 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, | |
1104 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, | |
1105 | 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, | |
1106 | 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, | |
1107 | 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, | |
1108 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, | |
1109 | 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, | |
1110 | 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, | |
1111 | 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, | |
1112 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, | |
1113 | 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, | |
1114 | 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, | |
1115 | 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, | |
1116 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, | |
1117 | 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, | |
1118 | 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, | |
1119 | 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, | |
1120 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, | |
1121 | 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, | |
1122 | 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, | |
1123 | 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, | |
1124 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, | |
1125 | 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, | |
1126 | 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, | |
1127 | 0x2d02ef8d | |
1128 | }; | |
1129 | const unsigned char *end; | |
1130 | ||
1131 | crc = ~crc & 0xffffffff; | |
1132 | for (end = buf + len; buf < end; ++ buf) | |
1133 | crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8); | |
1134 | return ~crc & 0xffffffff; | |
1135 | } | |
1136 | ||
1137 | ||
1138 | /* | |
1139 | INTERNAL_FUNCTION | |
1140 | bfd_get_debug_link_info_1 | |
1141 | ||
1142 | SYNOPSIS | |
1143 | char *bfd_get_debug_link_info_1 (bfd *abfd, void *crc32_out); | |
1144 | ||
1145 | DESCRIPTION | |
1146 | Extracts the filename and CRC32 value for any separate debug | |
1147 | information file associated with @var{abfd}. | |
1148 | ||
1149 | The @var{crc32_out} parameter is an untyped pointer because | |
1150 | this routine is used as a @code{get_func_type} function, but it | |
1151 | is expected to be an unsigned long pointer. | |
1152 | ||
1153 | RETURNS | |
1154 | The filename of the associated debug information file, or NULL | |
1155 | if there is no such file. If the filename was found then the | |
1156 | contents of @var{crc32_out} are updated to hold the corresponding | |
1157 | CRC32 value for the file. | |
1158 | ||
1159 | The returned filename is allocated with @code{malloc}; freeing | |
1160 | it is the responsibility of the caller. | |
1161 | */ | |
1162 | ||
1163 | static char * | |
1164 | bfd_get_debug_link_info_1 (bfd *abfd, void *crc32_out) | |
1165 | { | |
1166 | asection *sect; | |
1167 | unsigned long *crc32 = (unsigned long *) crc32_out; | |
1168 | bfd_byte *contents; | |
1169 | unsigned int crc_offset; | |
1170 | char *name; | |
1171 | bfd_size_type size; | |
1172 | ufile_ptr file_size; | |
1173 | ||
1174 | BFD_ASSERT (abfd); | |
1175 | BFD_ASSERT (crc32_out); | |
1176 | ||
1177 | sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK); | |
1178 | ||
1179 | if (sect == NULL) | |
1180 | return NULL; | |
1181 | ||
1182 | size = bfd_section_size (sect); | |
1183 | file_size = bfd_get_size (abfd); | |
1184 | ||
1185 | /* PR 22794: Make sure that the section has a reasonable size. */ | |
1186 | if (size < 8 || (file_size != 0 && size >= file_size)) | |
1187 | return NULL; | |
1188 | ||
1189 | if (!bfd_malloc_and_get_section (abfd, sect, &contents)) | |
1190 | { | |
1191 | free (contents); | |
1192 | return NULL; | |
1193 | } | |
1194 | ||
1195 | /* CRC value is stored after the filename, aligned up to 4 bytes. */ | |
1196 | name = (char *) contents; | |
1197 | /* PR 17597: Avoid reading off the end of the buffer. */ | |
1198 | crc_offset = strnlen (name, size) + 1; | |
1199 | crc_offset = (crc_offset + 3) & ~3; | |
1200 | if (crc_offset + 4 > size) | |
1201 | return NULL; | |
1202 | ||
1203 | *crc32 = bfd_get_32 (abfd, contents + crc_offset); | |
1204 | return name; | |
1205 | } | |
1206 | ||
1207 | ||
1208 | /* | |
1209 | FUNCTION | |
1210 | bfd_get_debug_link_info | |
1211 | ||
1212 | SYNOPSIS | |
1213 | char *bfd_get_debug_link_info (bfd *abfd, unsigned long *crc32_out); | |
1214 | ||
1215 | DESCRIPTION | |
1216 | Extracts the filename and CRC32 value for any separate debug | |
1217 | information file associated with @var{abfd}. | |
1218 | ||
1219 | RETURNS | |
1220 | The filename of the associated debug information file, or NULL | |
1221 | if there is no such file. If the filename was found then the | |
1222 | contents of @var{crc32_out} are updated to hold the corresponding | |
1223 | CRC32 value for the file. | |
1224 | ||
1225 | The returned filename is allocated with @code{malloc}; freeing | |
1226 | it is the responsibility of the caller. | |
1227 | */ | |
1228 | ||
1229 | char * | |
1230 | bfd_get_debug_link_info (bfd *abfd, unsigned long *crc32_out) | |
1231 | { | |
1232 | return bfd_get_debug_link_info_1 (abfd, crc32_out); | |
1233 | } | |
1234 | ||
1235 | /* | |
1236 | FUNCTION | |
1237 | bfd_get_alt_debug_link_info | |
1238 | ||
1239 | SYNOPSIS | |
1240 | char *bfd_get_alt_debug_link_info (bfd * abfd, | |
1241 | bfd_size_type *buildid_len, | |
1242 | bfd_byte **buildid_out); | |
1243 | ||
1244 | DESCRIPTION | |
1245 | Fetch the filename and BuildID value for any alternate debuginfo | |
1246 | associated with @var{abfd}. Return NULL if no such info found, | |
1247 | otherwise return filename and update @var{buildid_len} and | |
1248 | @var{buildid_out}. The returned filename and build_id are | |
1249 | allocated with @code{malloc}; freeing them is the responsibility | |
1250 | of the caller. | |
1251 | */ | |
1252 | ||
1253 | char * | |
1254 | bfd_get_alt_debug_link_info (bfd * abfd, bfd_size_type *buildid_len, | |
1255 | bfd_byte **buildid_out) | |
1256 | { | |
1257 | asection *sect; | |
1258 | bfd_byte *contents; | |
1259 | unsigned int buildid_offset; | |
1260 | char *name; | |
1261 | bfd_size_type size; | |
1262 | ufile_ptr file_size; | |
1263 | ||
1264 | BFD_ASSERT (abfd); | |
1265 | BFD_ASSERT (buildid_len); | |
1266 | BFD_ASSERT (buildid_out); | |
1267 | ||
1268 | sect = bfd_get_section_by_name (abfd, GNU_DEBUGALTLINK); | |
1269 | ||
1270 | if (sect == NULL) | |
1271 | return NULL; | |
1272 | ||
1273 | size = bfd_section_size (sect); | |
1274 | file_size = bfd_get_size (abfd); | |
1275 | if (size < 8 || (file_size != 0 && size >= file_size)) | |
1276 | return NULL; | |
1277 | ||
1278 | if (!bfd_malloc_and_get_section (abfd, sect, & contents)) | |
1279 | { | |
1280 | free (contents); | |
1281 | return NULL; | |
1282 | } | |
1283 | ||
1284 | /* BuildID value is stored after the filename. */ | |
1285 | name = (char *) contents; | |
1286 | buildid_offset = strnlen (name, size) + 1; | |
1287 | if (buildid_offset >= bfd_section_size (sect)) | |
1288 | return NULL; | |
1289 | ||
1290 | *buildid_len = size - buildid_offset; | |
1291 | *buildid_out = bfd_malloc (*buildid_len); | |
1292 | memcpy (*buildid_out, contents + buildid_offset, *buildid_len); | |
1293 | ||
1294 | return name; | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | INTERNAL_FUNCTION | |
1299 | separate_debug_file_exists | |
1300 | ||
1301 | SYNOPSIS | |
1302 | bfd_boolean separate_debug_file_exists | |
1303 | (char *name, void *crc32_p); | |
1304 | ||
1305 | DESCRIPTION | |
1306 | Checks to see if @var{name} is a file and if its contents | |
1307 | match @var{crc32}, which is a pointer to an @code{unsigned | |
1308 | long} containing a CRC32. | |
1309 | ||
1310 | The @var{crc32_p} parameter is an untyped pointer because | |
1311 | this routine is used as a @code{check_func_type} function. | |
1312 | */ | |
1313 | ||
1314 | static bfd_boolean | |
1315 | separate_debug_file_exists (const char *name, void *crc32_p) | |
1316 | { | |
1317 | static unsigned char buffer [8 * 1024]; | |
1318 | unsigned long file_crc = 0; | |
1319 | FILE *f; | |
1320 | bfd_size_type count; | |
1321 | unsigned long crc; | |
1322 | ||
1323 | BFD_ASSERT (name); | |
1324 | BFD_ASSERT (crc32_p); | |
1325 | ||
1326 | crc = *(unsigned long *) crc32_p; | |
1327 | ||
1328 | f = _bfd_real_fopen (name, FOPEN_RB); | |
1329 | if (f == NULL) | |
1330 | return FALSE; | |
1331 | ||
1332 | while ((count = fread (buffer, 1, sizeof (buffer), f)) > 0) | |
1333 | file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count); | |
1334 | ||
1335 | fclose (f); | |
1336 | ||
1337 | return crc == file_crc; | |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | INTERNAL_FUNCTION | |
1342 | separate_alt_debug_file_exists | |
1343 | ||
1344 | SYNOPSIS | |
1345 | bfd_boolean separate_alt_debug_file_exists | |
1346 | (char *name, void *unused); | |
1347 | ||
1348 | DESCRIPTION | |
1349 | Checks to see if @var{name} is a file. | |
1350 | */ | |
1351 | ||
1352 | static bfd_boolean | |
1353 | separate_alt_debug_file_exists (const char *name, void *unused ATTRIBUTE_UNUSED) | |
1354 | { | |
1355 | FILE *f; | |
1356 | ||
1357 | BFD_ASSERT (name); | |
1358 | ||
1359 | f = _bfd_real_fopen (name, FOPEN_RB); | |
1360 | if (f == NULL) | |
1361 | return FALSE; | |
1362 | ||
1363 | fclose (f); | |
1364 | ||
1365 | return TRUE; | |
1366 | } | |
1367 | ||
1368 | /* | |
1369 | INTERNAL_FUNCTION | |
1370 | find_separate_debug_file | |
1371 | ||
1372 | SYNOPSIS | |
1373 | char *find_separate_debug_file | |
1374 | (bfd *abfd, const char *dir, bfd_boolean include_dirs, | |
1375 | get_func_type get, check_func_type check, void *data); | |
1376 | ||
1377 | DESCRIPTION | |
1378 | Searches for a debug information file corresponding to @var{abfd}. | |
1379 | ||
1380 | The name of the separate debug info file is returned by the | |
1381 | @var{get} function. This function scans various fixed locations | |
1382 | in the filesystem, including the file tree rooted at @var{dir}. | |
1383 | If the @var{include_dirs} parameter is true then the directory | |
1384 | components of @var{abfd}'s filename will be included in the | |
1385 | searched locations. | |
1386 | ||
1387 | @var{data} is passed unmodified to the @var{get} and @var{check} | |
1388 | functions. It is generally used to implement build-id-like | |
1389 | matching in the callback functions. | |
1390 | ||
1391 | RETURNS | |
1392 | Returns the filename of the first file to be found which | |
1393 | receives a TRUE result from the @var{check} function. | |
1394 | Returns NULL if no valid file could be found. | |
1395 | */ | |
1396 | ||
1397 | typedef char * (* get_func_type) (bfd *, void *); | |
1398 | typedef bfd_boolean (* check_func_type) (const char *, void *); | |
1399 | ||
1400 | static char * | |
1401 | find_separate_debug_file (bfd * abfd, | |
1402 | const char * debug_file_directory, | |
1403 | bfd_boolean include_dirs, | |
1404 | get_func_type get_func, | |
1405 | check_func_type check_func, | |
1406 | void * func_data) | |
1407 | { | |
1408 | char *base; | |
1409 | char *dir; | |
1410 | char *debugfile; | |
1411 | char *canon_dir; | |
1412 | size_t dirlen; | |
1413 | size_t canon_dirlen; | |
1414 | ||
1415 | BFD_ASSERT (abfd); | |
1416 | if (debug_file_directory == NULL) | |
1417 | debug_file_directory = "."; | |
1418 | ||
1419 | /* BFD may have been opened from a stream. */ | |
1420 | if (bfd_get_filename (abfd) == NULL) | |
1421 | { | |
1422 | bfd_set_error (bfd_error_invalid_operation); | |
1423 | return NULL; | |
1424 | } | |
1425 | ||
1426 | base = get_func (abfd, func_data); | |
1427 | ||
1428 | if (base == NULL) | |
1429 | return NULL; | |
1430 | ||
1431 | if (base[0] == '\0') | |
1432 | { | |
1433 | free (base); | |
1434 | bfd_set_error (bfd_error_no_debug_section); | |
1435 | return NULL; | |
1436 | } | |
1437 | ||
1438 | if (include_dirs) | |
1439 | { | |
1440 | const char *fname = bfd_get_filename (abfd); | |
1441 | for (dirlen = strlen (fname); dirlen > 0; dirlen--) | |
1442 | if (IS_DIR_SEPARATOR (fname[dirlen - 1])) | |
1443 | break; | |
1444 | ||
1445 | dir = (char *) bfd_malloc (dirlen + 1); | |
1446 | if (dir == NULL) | |
1447 | { | |
1448 | free (base); | |
1449 | return NULL; | |
1450 | } | |
1451 | memcpy (dir, fname, dirlen); | |
1452 | dir[dirlen] = '\0'; | |
1453 | } | |
1454 | else | |
1455 | { | |
1456 | dir = (char *) bfd_malloc (1); | |
1457 | * dir = 0; | |
1458 | dirlen = 0; | |
1459 | } | |
1460 | ||
1461 | /* Compute the canonical name of the bfd object with all symbolic links | |
1462 | resolved, for use in the global debugfile directory. */ | |
1463 | canon_dir = lrealpath (bfd_get_filename (abfd)); | |
1464 | for (canon_dirlen = strlen (canon_dir); canon_dirlen > 0; canon_dirlen--) | |
1465 | if (IS_DIR_SEPARATOR (canon_dir[canon_dirlen - 1])) | |
1466 | break; | |
1467 | canon_dir[canon_dirlen] = '\0'; | |
1468 | ||
1469 | #ifndef EXTRA_DEBUG_ROOT1 | |
1470 | #define EXTRA_DEBUG_ROOT1 "/usr/lib/debug" | |
1471 | #endif | |
1472 | #ifndef EXTRA_DEBUG_ROOT2 | |
1473 | #define EXTRA_DEBUG_ROOT2 "/usr/lib/debug/usr" | |
1474 | #endif | |
1475 | ||
1476 | debugfile = (char *) | |
1477 | bfd_malloc (strlen (debug_file_directory) + 1 | |
1478 | + (canon_dirlen > dirlen ? canon_dirlen : dirlen) | |
1479 | + strlen (".debug/") | |
1480 | #ifdef EXTRA_DEBUG_ROOT1 | |
1481 | + strlen (EXTRA_DEBUG_ROOT1) | |
1482 | #endif | |
1483 | #ifdef EXTRA_DEBUG_ROOT2 | |
1484 | + strlen (EXTRA_DEBUG_ROOT2) | |
1485 | #endif | |
1486 | + strlen (base) | |
1487 | + 1); | |
1488 | if (debugfile == NULL) | |
1489 | goto found; /* Actually this returns NULL. */ | |
1490 | ||
1491 | /* First try in the same directory as the original file. | |
1492 | ||
1493 | FIXME: Strictly speaking if we are using the build-id method, | |
1494 | (ie include_dirs == FALSE) then we should only check absolute | |
1495 | paths, not relative ones like this one (and the next one). | |
1496 | The check is left in however as this allows the binutils | |
1497 | testsuite to exercise this feature without having to install | |
1498 | a file into the root filesystem. (See binutils/testsuite/ | |
1499 | binutils-all/objdump.exp for the test). */ | |
1500 | sprintf (debugfile, "%s%s", dir, base); | |
1501 | if (check_func (debugfile, func_data)) | |
1502 | goto found; | |
1503 | ||
1504 | /* Then try in a subdirectory called .debug. */ | |
1505 | sprintf (debugfile, "%s.debug/%s", dir, base); | |
1506 | if (check_func (debugfile, func_data)) | |
1507 | goto found; | |
1508 | ||
1509 | #ifdef EXTRA_DEBUG_ROOT1 | |
1510 | /* Try the first extra debug file root. */ | |
1511 | sprintf (debugfile, "%s%s%s", EXTRA_DEBUG_ROOT1, | |
1512 | include_dirs ? canon_dir : "/", base); | |
1513 | if (check_func (debugfile, func_data)) | |
1514 | goto found; | |
1515 | #endif | |
1516 | ||
1517 | #ifdef EXTRA_DEBUG_ROOT2 | |
1518 | /* Try the second extra debug file root. */ | |
1519 | sprintf (debugfile, "%s%s%s", EXTRA_DEBUG_ROOT2, | |
1520 | include_dirs ? canon_dir : "/", base); | |
1521 | if (check_func (debugfile, func_data)) | |
1522 | goto found; | |
1523 | #endif | |
1524 | ||
1525 | /* Then try in the global debugfile directory. */ | |
1526 | strcpy (debugfile, debug_file_directory); | |
1527 | dirlen = strlen (debug_file_directory) - 1; | |
1528 | if (include_dirs) | |
1529 | { | |
1530 | if (dirlen > 0 | |
1531 | && debug_file_directory[dirlen] != '/' | |
1532 | && canon_dir[0] != '/') | |
1533 | strcat (debugfile, "/"); | |
1534 | strcat (debugfile, canon_dir); | |
1535 | } | |
1536 | else | |
1537 | { | |
1538 | if (dirlen > 0 && debug_file_directory[dirlen] != '/') | |
1539 | strcat (debugfile, "/"); | |
1540 | } | |
1541 | strcat (debugfile, base); | |
1542 | ||
1543 | if (check_func (debugfile, func_data)) | |
1544 | goto found; | |
1545 | ||
1546 | /* Failed to find the file. */ | |
1547 | free (debugfile); | |
1548 | debugfile = NULL; | |
1549 | ||
1550 | found: | |
1551 | free (base); | |
1552 | free (dir); | |
1553 | free (canon_dir); | |
1554 | return debugfile; | |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | FUNCTION | |
1559 | bfd_follow_gnu_debuglink | |
1560 | ||
1561 | SYNOPSIS | |
1562 | char *bfd_follow_gnu_debuglink (bfd *abfd, const char *dir); | |
1563 | ||
1564 | DESCRIPTION | |
1565 | Takes a BFD and searches it for a .gnu_debuglink section. If this | |
1566 | section is found, it examines the section for the name and checksum | |
1567 | of a '.debug' file containing auxiliary debugging information. It | |
1568 | then searches the filesystem for this .debug file in some standard | |
1569 | locations, including the directory tree rooted at @var{dir}, and if | |
1570 | found returns the full filename. | |
1571 | ||
1572 | If @var{dir} is NULL, the search will take place starting at | |
1573 | the current directory. | |
1574 | ||
1575 | RETURNS | |
1576 | <<NULL>> on any errors or failure to locate the .debug file, | |
1577 | otherwise a pointer to a heap-allocated string containing the | |
1578 | filename. The caller is responsible for freeing this string. | |
1579 | */ | |
1580 | ||
1581 | char * | |
1582 | bfd_follow_gnu_debuglink (bfd *abfd, const char *dir) | |
1583 | { | |
1584 | unsigned long crc32; | |
1585 | ||
1586 | return find_separate_debug_file (abfd, dir, TRUE, | |
1587 | bfd_get_debug_link_info_1, | |
1588 | separate_debug_file_exists, &crc32); | |
1589 | } | |
1590 | ||
1591 | /* Helper for bfd_follow_gnu_debugaltlink. It just returns the name | |
1592 | of the separate debug file. */ | |
1593 | ||
1594 | static char * | |
1595 | get_alt_debug_link_info_shim (bfd * abfd, void *unused ATTRIBUTE_UNUSED) | |
1596 | { | |
1597 | bfd_size_type len; | |
1598 | bfd_byte *buildid = NULL; | |
1599 | char *result = bfd_get_alt_debug_link_info (abfd, &len, &buildid); | |
1600 | ||
1601 | free (buildid); | |
1602 | ||
1603 | return result; | |
1604 | } | |
1605 | ||
1606 | /* | |
1607 | FUNCTION | |
1608 | bfd_follow_gnu_debugaltlink | |
1609 | ||
1610 | SYNOPSIS | |
1611 | char *bfd_follow_gnu_debugaltlink (bfd *abfd, const char *dir); | |
1612 | ||
1613 | DESCRIPTION | |
1614 | Takes a BFD and searches it for a .gnu_debugaltlink section. If this | |
1615 | section is found, it examines the section for the name of a file | |
1616 | containing auxiliary debugging information. It then searches the | |
1617 | filesystem for this file in a set of standard locations, including | |
1618 | the directory tree rooted at @var{dir}, and if found returns the | |
1619 | full filename. | |
1620 | ||
1621 | If @var{dir} is NULL, the search will take place starting at | |
1622 | the current directory. | |
1623 | ||
1624 | RETURNS | |
1625 | <<NULL>> on any errors or failure to locate the debug file, | |
1626 | otherwise a pointer to a heap-allocated string containing the | |
1627 | filename. The caller is responsible for freeing this string. | |
1628 | */ | |
1629 | ||
1630 | char * | |
1631 | bfd_follow_gnu_debugaltlink (bfd *abfd, const char *dir) | |
1632 | { | |
1633 | return find_separate_debug_file (abfd, dir, TRUE, | |
1634 | get_alt_debug_link_info_shim, | |
1635 | separate_alt_debug_file_exists, | |
1636 | NULL); | |
1637 | } | |
1638 | ||
1639 | /* | |
1640 | FUNCTION | |
1641 | bfd_create_gnu_debuglink_section | |
1642 | ||
1643 | SYNOPSIS | |
1644 | struct bfd_section *bfd_create_gnu_debuglink_section | |
1645 | (bfd *abfd, const char *filename); | |
1646 | ||
1647 | DESCRIPTION | |
1648 | Takes a @var{BFD} and adds a .gnu_debuglink section to it. The | |
1649 | section is sized to be big enough to contain a link to the specified | |
1650 | @var{filename}. | |
1651 | ||
1652 | RETURNS | |
1653 | A pointer to the new section is returned if all is ok. Otherwise | |
1654 | <<NULL>> is returned and bfd_error is set. | |
1655 | */ | |
1656 | ||
1657 | asection * | |
1658 | bfd_create_gnu_debuglink_section (bfd *abfd, const char *filename) | |
1659 | { | |
1660 | asection *sect; | |
1661 | bfd_size_type debuglink_size; | |
1662 | flagword flags; | |
1663 | ||
1664 | if (abfd == NULL || filename == NULL) | |
1665 | { | |
1666 | bfd_set_error (bfd_error_invalid_operation); | |
1667 | return NULL; | |
1668 | } | |
1669 | ||
1670 | /* Strip off any path components in filename. */ | |
1671 | filename = lbasename (filename); | |
1672 | ||
1673 | sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK); | |
1674 | if (sect) | |
1675 | { | |
1676 | /* Section already exists. */ | |
1677 | bfd_set_error (bfd_error_invalid_operation); | |
1678 | return NULL; | |
1679 | } | |
1680 | ||
1681 | flags = SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING; | |
1682 | sect = bfd_make_section_with_flags (abfd, GNU_DEBUGLINK, flags); | |
1683 | if (sect == NULL) | |
1684 | return NULL; | |
1685 | ||
1686 | /* Compute the size of the section. Allow for the CRC after the filename, | |
1687 | and padding so that it will start on a 4-byte boundary. */ | |
1688 | debuglink_size = strlen (filename) + 1; | |
1689 | debuglink_size += 3; | |
1690 | debuglink_size &= ~3; | |
1691 | debuglink_size += 4; | |
1692 | ||
1693 | if (!bfd_set_section_size (sect, debuglink_size)) | |
1694 | /* XXX Should we delete the section from the bfd ? */ | |
1695 | return NULL; | |
1696 | ||
1697 | /* PR 21193: Ensure that the section has 4-byte alignment for the CRC. | |
1698 | Note - despite the name of the function being called, we are | |
1699 | setting an alignment power, not a byte alignment value. */ | |
1700 | bfd_set_section_alignment (sect, 2); | |
1701 | ||
1702 | return sect; | |
1703 | } | |
1704 | ||
1705 | ||
1706 | /* | |
1707 | FUNCTION | |
1708 | bfd_fill_in_gnu_debuglink_section | |
1709 | ||
1710 | SYNOPSIS | |
1711 | bfd_boolean bfd_fill_in_gnu_debuglink_section | |
1712 | (bfd *abfd, struct bfd_section *sect, const char *filename); | |
1713 | ||
1714 | DESCRIPTION | |
1715 | Takes a @var{BFD} and containing a .gnu_debuglink section @var{SECT} | |
1716 | and fills in the contents of the section to contain a link to the | |
1717 | specified @var{filename}. The filename should be relative to the | |
1718 | current directory. | |
1719 | ||
1720 | RETURNS | |
1721 | <<TRUE>> is returned if all is ok. Otherwise <<FALSE>> is returned | |
1722 | and bfd_error is set. | |
1723 | */ | |
1724 | ||
1725 | bfd_boolean | |
1726 | bfd_fill_in_gnu_debuglink_section (bfd *abfd, | |
1727 | struct bfd_section *sect, | |
1728 | const char *filename) | |
1729 | { | |
1730 | bfd_size_type debuglink_size; | |
1731 | unsigned long crc32; | |
1732 | char * contents; | |
1733 | bfd_size_type crc_offset; | |
1734 | FILE * handle; | |
1735 | static unsigned char buffer[8 * 1024]; | |
1736 | size_t count; | |
1737 | size_t filelen; | |
1738 | ||
1739 | if (abfd == NULL || sect == NULL || filename == NULL) | |
1740 | { | |
1741 | bfd_set_error (bfd_error_invalid_operation); | |
1742 | return FALSE; | |
1743 | } | |
1744 | ||
1745 | /* Make sure that we can read the file. | |
1746 | XXX - Should we attempt to locate the debug info file using the same | |
1747 | algorithm as gdb ? At the moment, since we are creating the | |
1748 | .gnu_debuglink section, we insist upon the user providing us with a | |
1749 | correct-for-section-creation-time path, but this need not conform to | |
1750 | the gdb location algorithm. */ | |
1751 | handle = _bfd_real_fopen (filename, FOPEN_RB); | |
1752 | if (handle == NULL) | |
1753 | { | |
1754 | bfd_set_error (bfd_error_system_call); | |
1755 | return FALSE; | |
1756 | } | |
1757 | ||
1758 | crc32 = 0; | |
1759 | while ((count = fread (buffer, 1, sizeof buffer, handle)) > 0) | |
1760 | crc32 = bfd_calc_gnu_debuglink_crc32 (crc32, buffer, count); | |
1761 | fclose (handle); | |
1762 | ||
1763 | /* Strip off any path components in filename, | |
1764 | now that we no longer need them. */ | |
1765 | filename = lbasename (filename); | |
1766 | ||
1767 | filelen = strlen (filename); | |
1768 | debuglink_size = filelen + 1; | |
1769 | debuglink_size += 3; | |
1770 | debuglink_size &= ~3; | |
1771 | debuglink_size += 4; | |
1772 | ||
1773 | contents = (char *) bfd_malloc (debuglink_size); | |
1774 | if (contents == NULL) | |
1775 | { | |
1776 | /* XXX Should we delete the section from the bfd ? */ | |
1777 | return FALSE; | |
1778 | } | |
1779 | ||
1780 | crc_offset = debuglink_size - 4; | |
1781 | memcpy (contents, filename, filelen); | |
1782 | memset (contents + filelen, 0, crc_offset - filelen); | |
1783 | ||
1784 | bfd_put_32 (abfd, crc32, contents + crc_offset); | |
1785 | ||
1786 | if (! bfd_set_section_contents (abfd, sect, contents, 0, debuglink_size)) | |
1787 | { | |
1788 | /* XXX Should we delete the section from the bfd ? */ | |
1789 | free (contents); | |
1790 | return FALSE; | |
1791 | } | |
1792 | ||
1793 | return TRUE; | |
1794 | } | |
1795 | ||
1796 | /* | |
1797 | INTERNAL_FUNCTION | |
1798 | get_build_id | |
1799 | ||
1800 | SYNOPSIS | |
1801 | struct bfd_build_id * get_build_id (bfd *abfd); | |
1802 | ||
1803 | DESCRIPTION | |
1804 | Finds the build-id associated with @var{abfd}. If the build-id is | |
1805 | extracted from the note section then a build-id structure is built | |
1806 | for it, using memory allocated to @var{abfd}, and this is then | |
1807 | attached to the @var{abfd}. | |
1808 | ||
1809 | RETURNS | |
1810 | Returns a pointer to the build-id structure if a build-id could be | |
1811 | found. If no build-id is found NULL is returned and error code is | |
1812 | set. | |
1813 | */ | |
1814 | ||
1815 | static struct bfd_build_id * | |
1816 | get_build_id (bfd *abfd) | |
1817 | { | |
1818 | struct bfd_build_id *build_id; | |
1819 | Elf_Internal_Note inote; | |
1820 | Elf_External_Note *enote; | |
1821 | bfd_byte *contents; | |
1822 | asection *sect; | |
1823 | bfd_size_type size; | |
1824 | ||
1825 | BFD_ASSERT (abfd); | |
1826 | ||
1827 | if (abfd->build_id && abfd->build_id->size > 0) | |
1828 | /* Save some time by using the already computed build-id. */ | |
1829 | return (struct bfd_build_id *) abfd->build_id; | |
1830 | ||
1831 | sect = bfd_get_section_by_name (abfd, ".note.gnu.build-id"); | |
1832 | if (sect == NULL) | |
1833 | { | |
1834 | bfd_set_error (bfd_error_no_debug_section); | |
1835 | return NULL; | |
1836 | } | |
1837 | ||
1838 | size = bfd_section_size (sect); | |
1839 | /* FIXME: Should we support smaller build-id notes ? */ | |
1840 | if (size < 0x24) | |
1841 | { | |
1842 | bfd_set_error (bfd_error_invalid_operation); | |
1843 | return NULL; | |
1844 | } | |
1845 | ||
1846 | if (!bfd_malloc_and_get_section (abfd, sect, & contents)) | |
1847 | { | |
1848 | free (contents); | |
1849 | return NULL; | |
1850 | } | |
1851 | ||
1852 | /* FIXME: Paranoia - allow for compressed build-id sections. | |
1853 | Maybe we should complain if this size is different from | |
1854 | the one obtained above... */ | |
1855 | size = bfd_section_size (sect); | |
1856 | if (size < sizeof (Elf_External_Note)) | |
1857 | { | |
1858 | bfd_set_error (bfd_error_invalid_operation); | |
1859 | free (contents); | |
1860 | return NULL; | |
1861 | } | |
1862 | ||
1863 | enote = (Elf_External_Note *) contents; | |
1864 | inote.type = H_GET_32 (abfd, enote->type); | |
1865 | inote.namesz = H_GET_32 (abfd, enote->namesz); | |
1866 | inote.namedata = enote->name; | |
1867 | inote.descsz = H_GET_32 (abfd, enote->descsz); | |
1868 | inote.descdata = inote.namedata + BFD_ALIGN (inote.namesz, 4); | |
1869 | /* FIXME: Should we check for extra notes in this section ? */ | |
1870 | ||
1871 | if (inote.descsz <= 0 | |
1872 | || inote.type != NT_GNU_BUILD_ID | |
1873 | || inote.namesz != 4 /* sizeof "GNU" */ | |
1874 | || strncmp (inote.namedata, "GNU", 4) != 0 | |
1875 | || inote.descsz > 0x7ffffffe | |
1876 | || size < (12 + BFD_ALIGN (inote.namesz, 4) + inote.descsz)) | |
1877 | { | |
1878 | free (contents); | |
1879 | bfd_set_error (bfd_error_invalid_operation); | |
1880 | return NULL; | |
1881 | } | |
1882 | ||
1883 | build_id = bfd_alloc (abfd, sizeof (struct bfd_build_id) + inote.descsz); | |
1884 | if (build_id == NULL) | |
1885 | { | |
1886 | free (contents); | |
1887 | return NULL; | |
1888 | } | |
1889 | ||
1890 | build_id->size = inote.descsz; | |
1891 | memcpy (build_id->data, inote.descdata, inote.descsz); | |
1892 | abfd->build_id = build_id; | |
1893 | free (contents); | |
1894 | ||
1895 | return build_id; | |
1896 | } | |
1897 | ||
1898 | /* | |
1899 | INTERNAL_FUNCTION | |
1900 | get_build_id_name | |
1901 | ||
1902 | SYNOPSIS | |
1903 | char * get_build_id_name (bfd *abfd, void *build_id_out_p) | |
1904 | ||
1905 | DESCRIPTION | |
1906 | Searches @var{abfd} for a build-id, and then constructs a pathname | |
1907 | from it. The path is computed as .build-id/NN/NN+NN.debug where | |
1908 | NNNN+NN is the build-id value as a hexadecimal string. | |
1909 | ||
1910 | RETURNS | |
1911 | Returns the constructed filename or NULL upon error. | |
1912 | It is the caller's responsibility to free the memory used to hold the | |
1913 | filename. | |
1914 | If a filename is returned then the @var{build_id_out_p} | |
1915 | parameter (which points to a @code{struct bfd_build_id} | |
1916 | pointer) is set to a pointer to the build_id structure. | |
1917 | */ | |
1918 | ||
1919 | static char * | |
1920 | get_build_id_name (bfd *abfd, void *build_id_out_p) | |
1921 | { | |
1922 | struct bfd_build_id **build_id_out = build_id_out_p; | |
1923 | struct bfd_build_id *build_id; | |
1924 | char *name; | |
1925 | char *n; | |
1926 | bfd_size_type s; | |
1927 | bfd_byte *d; | |
1928 | ||
1929 | if (abfd == NULL || bfd_get_filename (abfd) == NULL || build_id_out == NULL) | |
1930 | { | |
1931 | bfd_set_error (bfd_error_invalid_operation); | |
1932 | return NULL; | |
1933 | } | |
1934 | ||
1935 | build_id = get_build_id (abfd); | |
1936 | if (build_id == NULL) | |
1937 | return NULL; | |
1938 | ||
1939 | /* Compute the debug pathname corresponding to the build-id. */ | |
1940 | name = bfd_malloc (strlen (".build-id/") + build_id->size * 2 + 2 + strlen (".debug")); | |
1941 | if (name == NULL) | |
1942 | { | |
1943 | bfd_set_error (bfd_error_no_memory); | |
1944 | return NULL; | |
1945 | } | |
1946 | n = name; | |
1947 | d = build_id->data; | |
1948 | s = build_id->size; | |
1949 | ||
1950 | n += sprintf (n, ".build-id/"); | |
1951 | n += sprintf (n, "%02x", (unsigned) *d++); s--; | |
1952 | n += sprintf (n, "/"); | |
1953 | while (s--) | |
1954 | n += sprintf (n, "%02x", (unsigned) *d++); | |
1955 | n += sprintf (n, ".debug"); | |
1956 | ||
1957 | *build_id_out = build_id; | |
1958 | return name; | |
1959 | } | |
1960 | ||
1961 | /* | |
1962 | INTERNAL_FUNCTION | |
1963 | check_build_id_file | |
1964 | ||
1965 | SYNOPSIS | |
1966 | bfd_boolean check_build_id_file (char *name, void *buildid_p); | |
1967 | ||
1968 | DESCRIPTION | |
1969 | Checks to see if @var{name} is a readable file and if its build-id | |
1970 | matches @var{buildid}. | |
1971 | ||
1972 | RETURNS | |
1973 | Returns TRUE if the file exists, is readable, and contains a | |
1974 | build-id which matches the build-id pointed at by | |
1975 | @var{build_id_p} (which is really a @code{struct bfd_build_id **}). | |
1976 | */ | |
1977 | ||
1978 | static bfd_boolean | |
1979 | check_build_id_file (const char *name, void *buildid_p) | |
1980 | { | |
1981 | struct bfd_build_id *orig_build_id; | |
1982 | struct bfd_build_id *build_id; | |
1983 | bfd * file; | |
1984 | bfd_boolean result; | |
1985 | ||
1986 | BFD_ASSERT (name); | |
1987 | BFD_ASSERT (buildid_p); | |
1988 | ||
1989 | file = bfd_openr (name, NULL); | |
1990 | if (file == NULL) | |
1991 | return FALSE; | |
1992 | ||
1993 | /* If the file is an archive, process all of its elements. */ | |
1994 | if (! bfd_check_format (file, bfd_object)) | |
1995 | { | |
1996 | bfd_close (file); | |
1997 | return FALSE; | |
1998 | } | |
1999 | ||
2000 | build_id = get_build_id (file); | |
2001 | if (build_id == NULL) | |
2002 | { | |
2003 | bfd_close (file); | |
2004 | return FALSE; | |
2005 | } | |
2006 | ||
2007 | orig_build_id = *(struct bfd_build_id **) buildid_p; | |
2008 | ||
2009 | result = build_id->size == orig_build_id->size | |
2010 | && memcmp (build_id->data, orig_build_id->data, build_id->size) == 0; | |
2011 | ||
2012 | (void) bfd_close (file); | |
2013 | ||
2014 | return result; | |
2015 | } | |
2016 | ||
2017 | /* | |
2018 | FUNCTION | |
2019 | bfd_follow_build_id_debuglink | |
2020 | ||
2021 | SYNOPSIS | |
2022 | char *bfd_follow_build_id_debuglink (bfd *abfd, const char *dir); | |
2023 | ||
2024 | DESCRIPTION | |
2025 | Takes @var{abfd} and searches it for a .note.gnu.build-id section. | |
2026 | If this section is found, it extracts the value of the NT_GNU_BUILD_ID | |
2027 | note, which should be a hexadecimal value @var{NNNN+NN} (for | |
2028 | 32+ hex digits). It then searches the filesystem for a file named | |
2029 | @var{.build-id/NN/NN+NN.debug} in a set of standard locations, | |
2030 | including the directory tree rooted at @var{dir}. The filename | |
2031 | of the first matching file to be found is returned. A matching | |
2032 | file should contain a .note.gnu.build-id section with the same | |
2033 | @var{NNNN+NN} note as @var{abfd}, although this check is currently | |
2034 | not implemented. | |
2035 | ||
2036 | If @var{dir} is NULL, the search will take place starting at | |
2037 | the current directory. | |
2038 | ||
2039 | RETURNS | |
2040 | <<NULL>> on any errors or failure to locate the debug file, | |
2041 | otherwise a pointer to a heap-allocated string containing the | |
2042 | filename. The caller is responsible for freeing this string. | |
2043 | */ | |
2044 | ||
2045 | char * | |
2046 | bfd_follow_build_id_debuglink (bfd *abfd, const char *dir) | |
2047 | { | |
2048 | struct bfd_build_id *build_id; | |
2049 | ||
2050 | return find_separate_debug_file (abfd, dir, FALSE, | |
2051 | get_build_id_name, | |
2052 | check_build_id_file, &build_id); | |
2053 | } | |
2054 | ||
2055 | /* | |
2056 | FUNCTION | |
2057 | bfd_set_filename | |
2058 | ||
2059 | SYNOPSIS | |
2060 | const char *bfd_set_filename (bfd *abfd, const char *filename); | |
2061 | ||
2062 | DESCRIPTION | |
2063 | Set the filename of @var{abfd}, copying the FILENAME parameter to | |
2064 | bfd_alloc'd memory owned by @var{abfd}. Returns a pointer the | |
2065 | newly allocated name, or NULL if the allocation failed. | |
2066 | */ | |
2067 | ||
2068 | const char * | |
2069 | bfd_set_filename (bfd *abfd, const char *filename) | |
2070 | { | |
2071 | size_t len = strlen (filename) + 1; | |
2072 | char *n = bfd_alloc (abfd, len); | |
2073 | if (n) | |
2074 | { | |
2075 | memcpy (n, filename, len); | |
2076 | abfd->filename = n; | |
2077 | } | |
2078 | return n; | |
2079 | } |