Commit | Line | Data |
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cbb099e8 TT |
1 | /* Definitions for BFD wrappers used by GDB. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2011-2020 Free Software Foundation, Inc. |
cbb099e8 TT |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "gdb_bfd.h" | |
d6b28940 TT |
22 | #include "ui-out.h" |
23 | #include "gdbcmd.h" | |
6ec53d05 | 24 | #include "hashtab.h" |
268a13a5 | 25 | #include "gdbsupport/filestuff.h" |
4bf44c1c TT |
26 | #ifdef HAVE_MMAP |
27 | #include <sys/mman.h> | |
28 | #ifndef MAP_FAILED | |
29 | #define MAP_FAILED ((void *) -1) | |
30 | #endif | |
31 | #endif | |
f08e97fe GB |
32 | #include "target.h" |
33 | #include "gdb/fileio.h" | |
07c138c8 | 34 | #include "inferior.h" |
4bf44c1c TT |
35 | |
36 | /* An object of this type is stored in the section's user data when | |
37 | mapping a section. */ | |
38 | ||
39 | struct gdb_bfd_section_data | |
40 | { | |
41 | /* Size of the data. */ | |
42 | bfd_size_type size; | |
43 | /* If the data was mmapped, this is the length of the map. */ | |
44 | bfd_size_type map_len; | |
45 | /* The data. If NULL, the section data has not been read. */ | |
46 | void *data; | |
47 | /* If the data was mmapped, this is the map address. */ | |
48 | void *map_addr; | |
49 | }; | |
a4453b7e | 50 | |
d6b28940 TT |
51 | /* A hash table holding every BFD that gdb knows about. This is not |
52 | to be confused with 'gdb_bfd_cache', which is used for sharing | |
53 | BFDs; in contrast, this hash is used just to implement | |
54 | "maint info bfd". */ | |
55 | ||
56 | static htab_t all_bfds; | |
57 | ||
6ec53d05 TT |
58 | /* An object of this type is stored in each BFD's user data. */ |
59 | ||
60 | struct gdb_bfd_data | |
61 | { | |
06d5bbc8 TT |
62 | gdb_bfd_data (bfd *abfd) |
63 | : mtime (bfd_get_mtime (abfd)), | |
64 | size (bfd_get_size (abfd)), | |
65 | relocation_computed (0), | |
66 | needs_relocations (0), | |
67 | crc_computed (0) | |
68 | { | |
69 | struct stat buf; | |
70 | ||
71 | if (bfd_stat (abfd, &buf) == 0) | |
72 | { | |
73 | inode = buf.st_ino; | |
74 | device_id = buf.st_dev; | |
75 | } | |
76 | else | |
77 | { | |
78 | /* The stat failed. */ | |
79 | inode = 0; | |
80 | device_id = 0; | |
81 | } | |
82 | } | |
83 | ||
84 | ~gdb_bfd_data () | |
85 | { | |
06d5bbc8 TT |
86 | } |
87 | ||
6ec53d05 | 88 | /* The reference count. */ |
06d5bbc8 | 89 | int refc = 1; |
6ec53d05 TT |
90 | |
91 | /* The mtime of the BFD at the point the cache entry was made. */ | |
92 | time_t mtime; | |
b82d08cd | 93 | |
c04fe68f AB |
94 | /* The file size (in bytes) at the point the cache entry was made. */ |
95 | off_t size; | |
96 | ||
97 | /* The inode of the file at the point the cache entry was made. */ | |
98 | ino_t inode; | |
99 | ||
100 | /* The device id of the file at the point the cache entry was made. */ | |
101 | dev_t device_id; | |
102 | ||
1da77581 TT |
103 | /* This is true if we have determined whether this BFD has any |
104 | sections requiring relocation. */ | |
105 | unsigned int relocation_computed : 1; | |
106 | ||
107 | /* This is true if any section needs relocation. */ | |
108 | unsigned int needs_relocations : 1; | |
109 | ||
dccee2de TT |
110 | /* This is true if we have successfully computed the file's CRC. */ |
111 | unsigned int crc_computed : 1; | |
112 | ||
113 | /* The file's CRC. */ | |
06d5bbc8 | 114 | unsigned long crc = 0; |
dccee2de | 115 | |
b82d08cd TT |
116 | /* If the BFD comes from an archive, this points to the archive's |
117 | BFD. Otherwise, this is NULL. */ | |
06d5bbc8 | 118 | bfd *archive_bfd = nullptr; |
e992eda4 | 119 | |
13aaf454 | 120 | /* Table of all the bfds this bfd has included. */ |
d5833c62 | 121 | std::vector<gdb_bfd_ref_ptr> included_bfds; |
13aaf454 | 122 | |
e992eda4 | 123 | /* The registry. */ |
06d5bbc8 | 124 | REGISTRY_FIELDS = {}; |
6ec53d05 TT |
125 | }; |
126 | ||
e992eda4 TT |
127 | #define GDB_BFD_DATA_ACCESSOR(ABFD) \ |
128 | ((struct gdb_bfd_data *) bfd_usrdata (ABFD)) | |
129 | ||
130 | DEFINE_REGISTRY (bfd, GDB_BFD_DATA_ACCESSOR) | |
131 | ||
6ec53d05 TT |
132 | /* A hash table storing all the BFDs maintained in the cache. */ |
133 | ||
134 | static htab_t gdb_bfd_cache; | |
135 | ||
18989b3c AB |
136 | /* When true gdb will reuse an existing bfd object if the filename, |
137 | modification time, and file size all match. */ | |
138 | ||
491144b5 | 139 | static bool bfd_sharing = true; |
18989b3c AB |
140 | static void |
141 | show_bfd_sharing (struct ui_file *file, int from_tty, | |
142 | struct cmd_list_element *c, const char *value) | |
143 | { | |
144 | fprintf_filtered (file, _("BFD sharing is %s.\n"), value); | |
145 | } | |
146 | ||
566f5e3b AB |
147 | /* When non-zero debugging of the bfd caches is enabled. */ |
148 | ||
149 | static unsigned int debug_bfd_cache; | |
150 | static void | |
151 | show_bfd_cache_debug (struct ui_file *file, int from_tty, | |
152 | struct cmd_list_element *c, const char *value) | |
153 | { | |
154 | fprintf_filtered (file, _("BFD cache debugging is %s.\n"), value); | |
155 | } | |
156 | ||
6ec53d05 TT |
157 | /* The type of an object being looked up in gdb_bfd_cache. We use |
158 | htab's capability of storing one kind of object (BFD in this case) | |
159 | and using a different sort of object for searching. */ | |
160 | ||
161 | struct gdb_bfd_cache_search | |
162 | { | |
163 | /* The filename. */ | |
164 | const char *filename; | |
165 | /* The mtime. */ | |
166 | time_t mtime; | |
c04fe68f AB |
167 | /* The file size (in bytes). */ |
168 | off_t size; | |
169 | /* The inode of the file. */ | |
170 | ino_t inode; | |
171 | /* The device id of the file. */ | |
172 | dev_t device_id; | |
6ec53d05 TT |
173 | }; |
174 | ||
175 | /* A hash function for BFDs. */ | |
176 | ||
177 | static hashval_t | |
178 | hash_bfd (const void *b) | |
179 | { | |
9a3c8263 | 180 | const bfd *abfd = (const struct bfd *) b; |
6ec53d05 TT |
181 | |
182 | /* It is simplest to just hash the filename. */ | |
183 | return htab_hash_string (bfd_get_filename (abfd)); | |
184 | } | |
185 | ||
186 | /* An equality function for BFDs. Note that this expects the caller | |
187 | to search using struct gdb_bfd_cache_search only, not BFDs. */ | |
188 | ||
189 | static int | |
190 | eq_bfd (const void *a, const void *b) | |
191 | { | |
9a3c8263 SM |
192 | const bfd *abfd = (const struct bfd *) a; |
193 | const struct gdb_bfd_cache_search *s | |
194 | = (const struct gdb_bfd_cache_search *) b; | |
195 | struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); | |
6ec53d05 TT |
196 | |
197 | return (gdata->mtime == s->mtime | |
c04fe68f AB |
198 | && gdata->size == s->size |
199 | && gdata->inode == s->inode | |
200 | && gdata->device_id == s->device_id | |
6ec53d05 TT |
201 | && strcmp (bfd_get_filename (abfd), s->filename) == 0); |
202 | } | |
203 | ||
204 | /* See gdb_bfd.h. */ | |
205 | ||
f08e97fe GB |
206 | int |
207 | is_target_filename (const char *name) | |
208 | { | |
209 | return startswith (name, TARGET_SYSROOT_PREFIX); | |
210 | } | |
211 | ||
212 | /* See gdb_bfd.h. */ | |
213 | ||
214 | int | |
215 | gdb_bfd_has_target_filename (struct bfd *abfd) | |
216 | { | |
217 | return is_target_filename (bfd_get_filename (abfd)); | |
218 | } | |
219 | ||
220 | ||
221 | /* Return the system error number corresponding to ERRNUM. */ | |
222 | ||
223 | static int | |
224 | fileio_errno_to_host (int errnum) | |
225 | { | |
226 | switch (errnum) | |
227 | { | |
228 | case FILEIO_EPERM: | |
229 | return EPERM; | |
230 | case FILEIO_ENOENT: | |
231 | return ENOENT; | |
232 | case FILEIO_EINTR: | |
233 | return EINTR; | |
234 | case FILEIO_EIO: | |
235 | return EIO; | |
236 | case FILEIO_EBADF: | |
237 | return EBADF; | |
238 | case FILEIO_EACCES: | |
239 | return EACCES; | |
240 | case FILEIO_EFAULT: | |
241 | return EFAULT; | |
242 | case FILEIO_EBUSY: | |
243 | return EBUSY; | |
244 | case FILEIO_EEXIST: | |
245 | return EEXIST; | |
246 | case FILEIO_ENODEV: | |
247 | return ENODEV; | |
248 | case FILEIO_ENOTDIR: | |
249 | return ENOTDIR; | |
250 | case FILEIO_EISDIR: | |
251 | return EISDIR; | |
252 | case FILEIO_EINVAL: | |
253 | return EINVAL; | |
254 | case FILEIO_ENFILE: | |
255 | return ENFILE; | |
256 | case FILEIO_EMFILE: | |
257 | return EMFILE; | |
258 | case FILEIO_EFBIG: | |
259 | return EFBIG; | |
260 | case FILEIO_ENOSPC: | |
261 | return ENOSPC; | |
262 | case FILEIO_ESPIPE: | |
263 | return ESPIPE; | |
264 | case FILEIO_EROFS: | |
265 | return EROFS; | |
266 | case FILEIO_ENOSYS: | |
267 | return ENOSYS; | |
268 | case FILEIO_ENAMETOOLONG: | |
269 | return ENAMETOOLONG; | |
270 | } | |
271 | return -1; | |
272 | } | |
273 | ||
98c59b52 PA |
274 | /* bfd_openr_iovec OPEN_CLOSURE data for gdb_bfd_open. */ |
275 | struct gdb_bfd_open_closure | |
276 | { | |
277 | inferior *inf; | |
278 | bool warn_if_slow; | |
279 | }; | |
280 | ||
f08e97fe | 281 | /* Wrapper for target_fileio_open suitable for passing as the |
98c59b52 | 282 | OPEN_FUNC argument to gdb_bfd_openr_iovec. */ |
f08e97fe GB |
283 | |
284 | static void * | |
98c59b52 | 285 | gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *open_closure) |
f08e97fe GB |
286 | { |
287 | const char *filename = bfd_get_filename (abfd); | |
288 | int fd, target_errno; | |
289 | int *stream; | |
98c59b52 | 290 | gdb_bfd_open_closure *oclosure = (gdb_bfd_open_closure *) open_closure; |
f08e97fe GB |
291 | |
292 | gdb_assert (is_target_filename (filename)); | |
293 | ||
98c59b52 | 294 | fd = target_fileio_open (oclosure->inf, |
4111f652 | 295 | filename + strlen (TARGET_SYSROOT_PREFIX), |
98c59b52 | 296 | FILEIO_O_RDONLY, 0, oclosure->warn_if_slow, |
4111f652 | 297 | &target_errno); |
f08e97fe GB |
298 | if (fd == -1) |
299 | { | |
300 | errno = fileio_errno_to_host (target_errno); | |
301 | bfd_set_error (bfd_error_system_call); | |
302 | return NULL; | |
303 | } | |
304 | ||
305 | stream = XCNEW (int); | |
306 | *stream = fd; | |
307 | return stream; | |
308 | } | |
309 | ||
310 | /* Wrapper for target_fileio_pread suitable for passing as the | |
311 | PREAD_FUNC argument to gdb_bfd_openr_iovec. */ | |
312 | ||
313 | static file_ptr | |
314 | gdb_bfd_iovec_fileio_pread (struct bfd *abfd, void *stream, void *buf, | |
315 | file_ptr nbytes, file_ptr offset) | |
316 | { | |
317 | int fd = *(int *) stream; | |
318 | int target_errno; | |
319 | file_ptr pos, bytes; | |
320 | ||
321 | pos = 0; | |
322 | while (nbytes > pos) | |
323 | { | |
2d7711a3 GB |
324 | QUIT; |
325 | ||
f08e97fe GB |
326 | bytes = target_fileio_pread (fd, (gdb_byte *) buf + pos, |
327 | nbytes - pos, offset + pos, | |
328 | &target_errno); | |
329 | if (bytes == 0) | |
330 | /* Success, but no bytes, means end-of-file. */ | |
331 | break; | |
332 | if (bytes == -1) | |
333 | { | |
334 | errno = fileio_errno_to_host (target_errno); | |
335 | bfd_set_error (bfd_error_system_call); | |
336 | return -1; | |
337 | } | |
338 | ||
339 | pos += bytes; | |
340 | } | |
341 | ||
342 | return pos; | |
343 | } | |
344 | ||
345 | /* Wrapper for target_fileio_close suitable for passing as the | |
346 | CLOSE_FUNC argument to gdb_bfd_openr_iovec. */ | |
347 | ||
348 | static int | |
349 | gdb_bfd_iovec_fileio_close (struct bfd *abfd, void *stream) | |
350 | { | |
351 | int fd = *(int *) stream; | |
352 | int target_errno; | |
353 | ||
354 | xfree (stream); | |
355 | ||
356 | /* Ignore errors on close. These may happen with remote | |
357 | targets if the connection has already been torn down. */ | |
358 | target_fileio_close (fd, &target_errno); | |
359 | ||
360 | /* Zero means success. */ | |
361 | return 0; | |
362 | } | |
363 | ||
364 | /* Wrapper for target_fileio_fstat suitable for passing as the | |
365 | STAT_FUNC argument to gdb_bfd_openr_iovec. */ | |
366 | ||
367 | static int | |
368 | gdb_bfd_iovec_fileio_fstat (struct bfd *abfd, void *stream, | |
369 | struct stat *sb) | |
370 | { | |
371 | int fd = *(int *) stream; | |
372 | int target_errno; | |
373 | int result; | |
374 | ||
375 | result = target_fileio_fstat (fd, sb, &target_errno); | |
376 | if (result == -1) | |
377 | { | |
378 | errno = fileio_errno_to_host (target_errno); | |
379 | bfd_set_error (bfd_error_system_call); | |
380 | } | |
381 | ||
382 | return result; | |
383 | } | |
384 | ||
385 | /* See gdb_bfd.h. */ | |
386 | ||
192b62ce | 387 | gdb_bfd_ref_ptr |
98c59b52 PA |
388 | gdb_bfd_open (const char *name, const char *target, int fd, |
389 | bool warn_if_slow) | |
6ec53d05 TT |
390 | { |
391 | hashval_t hash; | |
392 | void **slot; | |
393 | bfd *abfd; | |
394 | struct gdb_bfd_cache_search search; | |
395 | struct stat st; | |
396 | ||
f08e97fe GB |
397 | if (is_target_filename (name)) |
398 | { | |
399 | if (!target_filesystem_is_local ()) | |
400 | { | |
401 | gdb_assert (fd == -1); | |
402 | ||
98c59b52 | 403 | gdb_bfd_open_closure open_closure { current_inferior (), warn_if_slow }; |
e3dd7556 | 404 | return gdb_bfd_openr_iovec (name, target, |
07c138c8 | 405 | gdb_bfd_iovec_fileio_open, |
98c59b52 | 406 | &open_closure, |
f08e97fe GB |
407 | gdb_bfd_iovec_fileio_pread, |
408 | gdb_bfd_iovec_fileio_close, | |
409 | gdb_bfd_iovec_fileio_fstat); | |
f08e97fe GB |
410 | } |
411 | ||
412 | name += strlen (TARGET_SYSROOT_PREFIX); | |
413 | } | |
414 | ||
6ec53d05 TT |
415 | if (gdb_bfd_cache == NULL) |
416 | gdb_bfd_cache = htab_create_alloc (1, hash_bfd, eq_bfd, NULL, | |
417 | xcalloc, xfree); | |
418 | ||
419 | if (fd == -1) | |
420 | { | |
614c279d | 421 | fd = gdb_open_cloexec (name, O_RDONLY | O_BINARY, 0); |
6ec53d05 TT |
422 | if (fd == -1) |
423 | { | |
424 | bfd_set_error (bfd_error_system_call); | |
425 | return NULL; | |
426 | } | |
427 | } | |
428 | ||
429 | search.filename = name; | |
430 | if (fstat (fd, &st) < 0) | |
431 | { | |
432 | /* Weird situation here. */ | |
433 | search.mtime = 0; | |
c04fe68f AB |
434 | search.size = 0; |
435 | search.inode = 0; | |
436 | search.device_id = 0; | |
6ec53d05 TT |
437 | } |
438 | else | |
c04fe68f AB |
439 | { |
440 | search.mtime = st.st_mtime; | |
441 | search.size = st.st_size; | |
442 | search.inode = st.st_ino; | |
443 | search.device_id = st.st_dev; | |
444 | } | |
6ec53d05 TT |
445 | |
446 | /* Note that this must compute the same result as hash_bfd. */ | |
447 | hash = htab_hash_string (name); | |
448 | /* Note that we cannot use htab_find_slot_with_hash here, because | |
449 | opening the BFD may fail; and this would violate hashtab | |
450 | invariants. */ | |
9a3c8263 | 451 | abfd = (struct bfd *) htab_find_with_hash (gdb_bfd_cache, &search, hash); |
18989b3c | 452 | if (bfd_sharing && abfd != NULL) |
6ec53d05 | 453 | { |
566f5e3b AB |
454 | if (debug_bfd_cache) |
455 | fprintf_unfiltered (gdb_stdlog, | |
456 | "Reusing cached bfd %s for %s\n", | |
457 | host_address_to_string (abfd), | |
458 | bfd_get_filename (abfd)); | |
6ec53d05 | 459 | close (fd); |
1831a9f9 | 460 | return gdb_bfd_ref_ptr::new_reference (abfd); |
6ec53d05 TT |
461 | } |
462 | ||
463 | abfd = bfd_fopen (name, target, FOPEN_RB, fd); | |
464 | if (abfd == NULL) | |
465 | return NULL; | |
466 | ||
566f5e3b AB |
467 | if (debug_bfd_cache) |
468 | fprintf_unfiltered (gdb_stdlog, | |
469 | "Creating new bfd %s for %s\n", | |
470 | host_address_to_string (abfd), | |
471 | bfd_get_filename (abfd)); | |
472 | ||
18989b3c AB |
473 | if (bfd_sharing) |
474 | { | |
475 | slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash, INSERT); | |
476 | gdb_assert (!*slot); | |
477 | *slot = abfd; | |
478 | } | |
6ec53d05 | 479 | |
1831a9f9 | 480 | return gdb_bfd_ref_ptr::new_reference (abfd); |
6ec53d05 TT |
481 | } |
482 | ||
4bf44c1c TT |
483 | /* A helper function that releases any section data attached to the |
484 | BFD. */ | |
485 | ||
486 | static void | |
487 | free_one_bfd_section (bfd *abfd, asection *sectp, void *ignore) | |
488 | { | |
9a3c8263 | 489 | struct gdb_bfd_section_data *sect |
fd361982 | 490 | = (struct gdb_bfd_section_data *) bfd_section_userdata (sectp); |
4bf44c1c TT |
491 | |
492 | if (sect != NULL && sect->data != NULL) | |
493 | { | |
494 | #ifdef HAVE_MMAP | |
495 | if (sect->map_addr != NULL) | |
496 | { | |
497 | int res; | |
498 | ||
499 | res = munmap (sect->map_addr, sect->map_len); | |
500 | gdb_assert (res == 0); | |
501 | } | |
502 | else | |
503 | #endif | |
504 | xfree (sect->data); | |
505 | } | |
506 | } | |
507 | ||
cbb099e8 TT |
508 | /* Close ABFD, and warn if that fails. */ |
509 | ||
510 | static int | |
511 | gdb_bfd_close_or_warn (struct bfd *abfd) | |
512 | { | |
513 | int ret; | |
b16c44de | 514 | const char *name = bfd_get_filename (abfd); |
cbb099e8 | 515 | |
4bf44c1c TT |
516 | bfd_map_over_sections (abfd, free_one_bfd_section, NULL); |
517 | ||
cbb099e8 TT |
518 | ret = bfd_close (abfd); |
519 | ||
520 | if (!ret) | |
521 | warning (_("cannot close \"%s\": %s"), | |
522 | name, bfd_errmsg (bfd_get_error ())); | |
523 | ||
524 | return ret; | |
525 | } | |
526 | ||
596f7d67 | 527 | /* See gdb_bfd.h. */ |
cbb099e8 | 528 | |
520b0001 | 529 | void |
cbb099e8 TT |
530 | gdb_bfd_ref (struct bfd *abfd) |
531 | { | |
6ec53d05 | 532 | struct gdb_bfd_data *gdata; |
d6b28940 | 533 | void **slot; |
cbb099e8 TT |
534 | |
535 | if (abfd == NULL) | |
520b0001 | 536 | return; |
cbb099e8 | 537 | |
9a3c8263 | 538 | gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); |
cbb099e8 | 539 | |
566f5e3b AB |
540 | if (debug_bfd_cache) |
541 | fprintf_unfiltered (gdb_stdlog, | |
542 | "Increase reference count on bfd %s (%s)\n", | |
543 | host_address_to_string (abfd), | |
544 | bfd_get_filename (abfd)); | |
545 | ||
6ec53d05 | 546 | if (gdata != NULL) |
cbb099e8 | 547 | { |
6ec53d05 | 548 | gdata->refc += 1; |
520b0001 | 549 | return; |
cbb099e8 TT |
550 | } |
551 | ||
ea9f10bb TT |
552 | /* Ask BFD to decompress sections in bfd_get_full_section_contents. */ |
553 | abfd->flags |= BFD_DECOMPRESS; | |
554 | ||
06d5bbc8 | 555 | gdata = new gdb_bfd_data (abfd); |
00f93c44 | 556 | bfd_set_usrdata (abfd, gdata); |
e992eda4 TT |
557 | bfd_alloc_data (abfd); |
558 | ||
d6b28940 TT |
559 | /* This is the first we've seen it, so add it to the hash table. */ |
560 | slot = htab_find_slot (all_bfds, abfd, INSERT); | |
561 | gdb_assert (slot && !*slot); | |
562 | *slot = abfd; | |
cbb099e8 TT |
563 | } |
564 | ||
596f7d67 | 565 | /* See gdb_bfd.h. */ |
cbb099e8 TT |
566 | |
567 | void | |
568 | gdb_bfd_unref (struct bfd *abfd) | |
569 | { | |
6ec53d05 TT |
570 | struct gdb_bfd_data *gdata; |
571 | struct gdb_bfd_cache_search search; | |
06d5bbc8 | 572 | bfd *archive_bfd; |
cbb099e8 TT |
573 | |
574 | if (abfd == NULL) | |
575 | return; | |
576 | ||
9a3c8263 | 577 | gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); |
6ec53d05 | 578 | gdb_assert (gdata->refc >= 1); |
cbb099e8 | 579 | |
6ec53d05 TT |
580 | gdata->refc -= 1; |
581 | if (gdata->refc > 0) | |
566f5e3b AB |
582 | { |
583 | if (debug_bfd_cache) | |
584 | fprintf_unfiltered (gdb_stdlog, | |
585 | "Decrease reference count on bfd %s (%s)\n", | |
586 | host_address_to_string (abfd), | |
587 | bfd_get_filename (abfd)); | |
588 | return; | |
589 | } | |
590 | ||
591 | if (debug_bfd_cache) | |
592 | fprintf_unfiltered (gdb_stdlog, | |
593 | "Delete final reference count on bfd %s (%s)\n", | |
594 | host_address_to_string (abfd), | |
595 | bfd_get_filename (abfd)); | |
cbb099e8 | 596 | |
b82d08cd | 597 | archive_bfd = gdata->archive_bfd; |
6ec53d05 TT |
598 | search.filename = bfd_get_filename (abfd); |
599 | ||
600 | if (gdb_bfd_cache && search.filename) | |
601 | { | |
602 | hashval_t hash = htab_hash_string (search.filename); | |
603 | void **slot; | |
604 | ||
605 | search.mtime = gdata->mtime; | |
c04fe68f AB |
606 | search.size = gdata->size; |
607 | search.inode = gdata->inode; | |
608 | search.device_id = gdata->device_id; | |
6ec53d05 TT |
609 | slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash, |
610 | NO_INSERT); | |
611 | ||
612 | if (slot && *slot) | |
613 | htab_clear_slot (gdb_bfd_cache, slot); | |
614 | } | |
615 | ||
e992eda4 | 616 | bfd_free_data (abfd); |
06d5bbc8 | 617 | delete gdata; |
00f93c44 | 618 | bfd_set_usrdata (abfd, NULL); /* Paranoia. */ |
cbb099e8 | 619 | |
d6b28940 TT |
620 | htab_remove_elt (all_bfds, abfd); |
621 | ||
cbb099e8 | 622 | gdb_bfd_close_or_warn (abfd); |
b82d08cd TT |
623 | |
624 | gdb_bfd_unref (archive_bfd); | |
cbb099e8 | 625 | } |
4bf44c1c TT |
626 | |
627 | /* A helper function that returns the section data descriptor | |
628 | associated with SECTION. If no such descriptor exists, a new one | |
629 | is allocated and cleared. */ | |
630 | ||
631 | static struct gdb_bfd_section_data * | |
632 | get_section_descriptor (asection *section) | |
633 | { | |
634 | struct gdb_bfd_section_data *result; | |
635 | ||
fd361982 | 636 | result = (struct gdb_bfd_section_data *) bfd_section_userdata (section); |
4bf44c1c TT |
637 | |
638 | if (result == NULL) | |
639 | { | |
224c3ddb SM |
640 | result = ((struct gdb_bfd_section_data *) |
641 | bfd_zalloc (section->owner, sizeof (*result))); | |
fd361982 | 642 | bfd_set_section_userdata (section, result); |
4bf44c1c TT |
643 | } |
644 | ||
645 | return result; | |
646 | } | |
647 | ||
4bf44c1c TT |
648 | /* See gdb_bfd.h. */ |
649 | ||
650 | const gdb_byte * | |
651 | gdb_bfd_map_section (asection *sectp, bfd_size_type *size) | |
652 | { | |
653 | bfd *abfd; | |
4bf44c1c | 654 | struct gdb_bfd_section_data *descriptor; |
ea9f10bb | 655 | bfd_byte *data; |
4bf44c1c TT |
656 | |
657 | gdb_assert ((sectp->flags & SEC_RELOC) == 0); | |
658 | gdb_assert (size != NULL); | |
659 | ||
660 | abfd = sectp->owner; | |
661 | ||
662 | descriptor = get_section_descriptor (sectp); | |
663 | ||
664 | /* If the data was already read for this BFD, just reuse it. */ | |
665 | if (descriptor->data != NULL) | |
666 | goto done; | |
667 | ||
ea9f10bb TT |
668 | #ifdef HAVE_MMAP |
669 | if (!bfd_is_section_compressed (abfd, sectp)) | |
4bf44c1c | 670 | { |
ea9f10bb TT |
671 | /* The page size, used when mmapping. */ |
672 | static int pagesize; | |
4bf44c1c | 673 | |
ea9f10bb TT |
674 | if (pagesize == 0) |
675 | pagesize = getpagesize (); | |
676 | ||
677 | /* Only try to mmap sections which are large enough: we don't want | |
678 | to waste space due to fragmentation. */ | |
679 | ||
fd361982 | 680 | if (bfd_section_size (sectp) > 4 * pagesize) |
ea9f10bb | 681 | { |
fd361982 | 682 | descriptor->size = bfd_section_size (sectp); |
ea9f10bb TT |
683 | descriptor->data = bfd_mmap (abfd, 0, descriptor->size, PROT_READ, |
684 | MAP_PRIVATE, sectp->filepos, | |
685 | &descriptor->map_addr, | |
686 | &descriptor->map_len); | |
687 | ||
688 | if ((caddr_t)descriptor->data != MAP_FAILED) | |
689 | { | |
4bf44c1c | 690 | #if HAVE_POSIX_MADVISE |
ea9f10bb TT |
691 | posix_madvise (descriptor->map_addr, descriptor->map_len, |
692 | POSIX_MADV_WILLNEED); | |
4bf44c1c | 693 | #endif |
ea9f10bb TT |
694 | goto done; |
695 | } | |
4bf44c1c | 696 | |
ea9f10bb TT |
697 | /* On failure, clear out the section data and try again. */ |
698 | memset (descriptor, 0, sizeof (*descriptor)); | |
699 | } | |
700 | } | |
4bf44c1c TT |
701 | #endif /* HAVE_MMAP */ |
702 | ||
ea9f10bb TT |
703 | /* Handle compressed sections, or ordinary uncompressed sections in |
704 | the no-mmap case. */ | |
4bf44c1c | 705 | |
fd361982 | 706 | descriptor->size = bfd_section_size (sectp); |
ea9f10bb | 707 | descriptor->data = NULL; |
4bf44c1c | 708 | |
ea9f10bb TT |
709 | data = NULL; |
710 | if (!bfd_get_full_section_contents (abfd, sectp, &data)) | |
41667530 MG |
711 | { |
712 | warning (_("Can't read data for section '%s' in file '%s'"), | |
fd361982 | 713 | bfd_section_name (sectp), |
41667530 MG |
714 | bfd_get_filename (abfd)); |
715 | /* Set size to 0 to prevent further attempts to read the invalid | |
716 | section. */ | |
717 | *size = 0; | |
cafb3438 | 718 | return NULL; |
41667530 | 719 | } |
ea9f10bb | 720 | descriptor->data = data; |
4bf44c1c TT |
721 | |
722 | done: | |
723 | gdb_assert (descriptor->data != NULL); | |
724 | *size = descriptor->size; | |
9a3c8263 | 725 | return (const gdb_byte *) descriptor->data; |
4bf44c1c | 726 | } |
64c31149 | 727 | |
dccee2de TT |
728 | /* Return 32-bit CRC for ABFD. If successful store it to *FILE_CRC_RETURN and |
729 | return 1. Otherwise print a warning and return 0. ABFD seek position is | |
730 | not preserved. */ | |
731 | ||
732 | static int | |
733 | get_file_crc (bfd *abfd, unsigned long *file_crc_return) | |
734 | { | |
735 | unsigned long file_crc = 0; | |
736 | ||
737 | if (bfd_seek (abfd, 0, SEEK_SET) != 0) | |
738 | { | |
739 | warning (_("Problem reading \"%s\" for CRC: %s"), | |
740 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); | |
741 | return 0; | |
742 | } | |
743 | ||
744 | for (;;) | |
745 | { | |
746 | gdb_byte buffer[8 * 1024]; | |
747 | bfd_size_type count; | |
748 | ||
749 | count = bfd_bread (buffer, sizeof (buffer), abfd); | |
750 | if (count == (bfd_size_type) -1) | |
751 | { | |
752 | warning (_("Problem reading \"%s\" for CRC: %s"), | |
753 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); | |
754 | return 0; | |
755 | } | |
756 | if (count == 0) | |
757 | break; | |
758 | file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count); | |
759 | } | |
760 | ||
761 | *file_crc_return = file_crc; | |
762 | return 1; | |
763 | } | |
764 | ||
765 | /* See gdb_bfd.h. */ | |
766 | ||
767 | int | |
768 | gdb_bfd_crc (struct bfd *abfd, unsigned long *crc_out) | |
769 | { | |
9a3c8263 | 770 | struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); |
dccee2de TT |
771 | |
772 | if (!gdata->crc_computed) | |
773 | gdata->crc_computed = get_file_crc (abfd, &gdata->crc); | |
774 | ||
775 | if (gdata->crc_computed) | |
776 | *crc_out = gdata->crc; | |
777 | return gdata->crc_computed; | |
778 | } | |
779 | ||
64c31149 TT |
780 | \f |
781 | ||
782 | /* See gdb_bfd.h. */ | |
783 | ||
192b62ce | 784 | gdb_bfd_ref_ptr |
64c31149 TT |
785 | gdb_bfd_fopen (const char *filename, const char *target, const char *mode, |
786 | int fd) | |
787 | { | |
788 | bfd *result = bfd_fopen (filename, target, mode, fd); | |
789 | ||
1831a9f9 | 790 | return gdb_bfd_ref_ptr::new_reference (result); |
64c31149 TT |
791 | } |
792 | ||
793 | /* See gdb_bfd.h. */ | |
794 | ||
192b62ce | 795 | gdb_bfd_ref_ptr |
64c31149 TT |
796 | gdb_bfd_openr (const char *filename, const char *target) |
797 | { | |
798 | bfd *result = bfd_openr (filename, target); | |
799 | ||
1831a9f9 | 800 | return gdb_bfd_ref_ptr::new_reference (result); |
64c31149 TT |
801 | } |
802 | ||
803 | /* See gdb_bfd.h. */ | |
804 | ||
192b62ce | 805 | gdb_bfd_ref_ptr |
64c31149 TT |
806 | gdb_bfd_openw (const char *filename, const char *target) |
807 | { | |
808 | bfd *result = bfd_openw (filename, target); | |
809 | ||
1831a9f9 | 810 | return gdb_bfd_ref_ptr::new_reference (result); |
64c31149 TT |
811 | } |
812 | ||
813 | /* See gdb_bfd.h. */ | |
814 | ||
192b62ce | 815 | gdb_bfd_ref_ptr |
64c31149 TT |
816 | gdb_bfd_openr_iovec (const char *filename, const char *target, |
817 | void *(*open_func) (struct bfd *nbfd, | |
818 | void *open_closure), | |
819 | void *open_closure, | |
820 | file_ptr (*pread_func) (struct bfd *nbfd, | |
821 | void *stream, | |
822 | void *buf, | |
823 | file_ptr nbytes, | |
824 | file_ptr offset), | |
825 | int (*close_func) (struct bfd *nbfd, | |
826 | void *stream), | |
827 | int (*stat_func) (struct bfd *abfd, | |
828 | void *stream, | |
829 | struct stat *sb)) | |
830 | { | |
831 | bfd *result = bfd_openr_iovec (filename, target, | |
832 | open_func, open_closure, | |
833 | pread_func, close_func, stat_func); | |
834 | ||
1831a9f9 | 835 | return gdb_bfd_ref_ptr::new_reference (result); |
64c31149 TT |
836 | } |
837 | ||
838 | /* See gdb_bfd.h. */ | |
839 | ||
0cd61f44 TT |
840 | void |
841 | gdb_bfd_mark_parent (bfd *child, bfd *parent) | |
842 | { | |
843 | struct gdb_bfd_data *gdata; | |
844 | ||
845 | gdb_bfd_ref (child); | |
846 | /* No need to stash the filename here, because we also keep a | |
847 | reference on the parent archive. */ | |
848 | ||
9a3c8263 | 849 | gdata = (struct gdb_bfd_data *) bfd_usrdata (child); |
0cd61f44 TT |
850 | if (gdata->archive_bfd == NULL) |
851 | { | |
852 | gdata->archive_bfd = parent; | |
853 | gdb_bfd_ref (parent); | |
854 | } | |
855 | else | |
856 | gdb_assert (gdata->archive_bfd == parent); | |
857 | } | |
858 | ||
859 | /* See gdb_bfd.h. */ | |
860 | ||
192b62ce | 861 | gdb_bfd_ref_ptr |
64c31149 TT |
862 | gdb_bfd_openr_next_archived_file (bfd *archive, bfd *previous) |
863 | { | |
864 | bfd *result = bfd_openr_next_archived_file (archive, previous); | |
865 | ||
866 | if (result) | |
0cd61f44 | 867 | gdb_bfd_mark_parent (result, archive); |
64c31149 | 868 | |
192b62ce | 869 | return gdb_bfd_ref_ptr (result); |
64c31149 TT |
870 | } |
871 | ||
872 | /* See gdb_bfd.h. */ | |
873 | ||
13aaf454 DE |
874 | void |
875 | gdb_bfd_record_inclusion (bfd *includer, bfd *includee) | |
876 | { | |
877 | struct gdb_bfd_data *gdata; | |
878 | ||
9a3c8263 | 879 | gdata = (struct gdb_bfd_data *) bfd_usrdata (includer); |
1831a9f9 | 880 | gdata->included_bfds.push_back (gdb_bfd_ref_ptr::new_reference (includee)); |
13aaf454 DE |
881 | } |
882 | ||
d6b28940 TT |
883 | \f |
884 | ||
65cf3563 TT |
885 | gdb_static_assert (ARRAY_SIZE (_bfd_std_section) == 4); |
886 | ||
887 | /* See gdb_bfd.h. */ | |
888 | ||
889 | int | |
890 | gdb_bfd_section_index (bfd *abfd, asection *section) | |
891 | { | |
892 | if (section == NULL) | |
893 | return -1; | |
894 | else if (section == bfd_com_section_ptr) | |
ce9c0ca1 | 895 | return bfd_count_sections (abfd); |
65cf3563 | 896 | else if (section == bfd_und_section_ptr) |
ce9c0ca1 | 897 | return bfd_count_sections (abfd) + 1; |
65cf3563 | 898 | else if (section == bfd_abs_section_ptr) |
ce9c0ca1 | 899 | return bfd_count_sections (abfd) + 2; |
65cf3563 | 900 | else if (section == bfd_ind_section_ptr) |
ce9c0ca1 | 901 | return bfd_count_sections (abfd) + 3; |
65cf3563 TT |
902 | return section->index; |
903 | } | |
904 | ||
905 | /* See gdb_bfd.h. */ | |
906 | ||
907 | int | |
908 | gdb_bfd_count_sections (bfd *abfd) | |
909 | { | |
910 | return bfd_count_sections (abfd) + 4; | |
911 | } | |
912 | ||
1da77581 TT |
913 | /* See gdb_bfd.h. */ |
914 | ||
915 | int | |
916 | gdb_bfd_requires_relocations (bfd *abfd) | |
917 | { | |
9a3c8263 | 918 | struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); |
1da77581 TT |
919 | |
920 | if (gdata->relocation_computed == 0) | |
921 | { | |
922 | asection *sect; | |
923 | ||
924 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
925 | if ((sect->flags & SEC_RELOC) != 0) | |
926 | { | |
927 | gdata->needs_relocations = 1; | |
928 | break; | |
929 | } | |
930 | ||
931 | gdata->relocation_computed = 1; | |
932 | } | |
933 | ||
934 | return gdata->needs_relocations; | |
935 | } | |
936 | ||
e0fc5c3f SM |
937 | /* See gdb_bfd.h. */ |
938 | ||
939 | bool | |
940 | gdb_bfd_get_full_section_contents (bfd *abfd, asection *section, | |
941 | gdb::byte_vector *contents) | |
942 | { | |
943 | bfd_size_type section_size = bfd_section_size (section); | |
944 | ||
945 | contents->resize (section_size); | |
946 | ||
947 | return bfd_get_section_contents (abfd, section, contents->data (), 0, | |
948 | section_size); | |
949 | } | |
65cf3563 | 950 | |
d6b28940 TT |
951 | /* A callback for htab_traverse that prints a single BFD. */ |
952 | ||
953 | static int | |
954 | print_one_bfd (void **slot, void *data) | |
955 | { | |
9a3c8263 SM |
956 | bfd *abfd = (struct bfd *) *slot; |
957 | struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); | |
958 | struct ui_out *uiout = (struct ui_out *) data; | |
d6b28940 | 959 | |
2e783024 | 960 | ui_out_emit_tuple tuple_emitter (uiout, NULL); |
381befee | 961 | uiout->field_signed ("refcount", gdata->refc); |
112e8700 SM |
962 | uiout->field_string ("addr", host_address_to_string (abfd)); |
963 | uiout->field_string ("filename", bfd_get_filename (abfd)); | |
964 | uiout->text ("\n"); | |
d6b28940 TT |
965 | |
966 | return 1; | |
967 | } | |
968 | ||
969 | /* Implement the 'maint info bfd' command. */ | |
970 | ||
971 | static void | |
e4e33335 | 972 | maintenance_info_bfds (const char *arg, int from_tty) |
d6b28940 | 973 | { |
d6b28940 TT |
974 | struct ui_out *uiout = current_uiout; |
975 | ||
4a2b031d | 976 | ui_out_emit_table table_emitter (uiout, 3, -1, "bfds"); |
112e8700 SM |
977 | uiout->table_header (10, ui_left, "refcount", "Refcount"); |
978 | uiout->table_header (18, ui_left, "addr", "Address"); | |
979 | uiout->table_header (40, ui_left, "filename", "Filename"); | |
d6b28940 | 980 | |
112e8700 | 981 | uiout->table_body (); |
d6b28940 | 982 | htab_traverse (all_bfds, print_one_bfd, uiout); |
d6b28940 TT |
983 | } |
984 | ||
6c265988 | 985 | void _initialize_gdb_bfd (); |
d6b28940 | 986 | void |
6c265988 | 987 | _initialize_gdb_bfd () |
d6b28940 TT |
988 | { |
989 | all_bfds = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer, | |
990 | NULL, xcalloc, xfree); | |
991 | ||
992 | add_cmd ("bfds", class_maintenance, maintenance_info_bfds, _("\ | |
993 | List the BFDs that are currently open."), | |
994 | &maintenanceinfolist); | |
18989b3c AB |
995 | |
996 | add_setshow_boolean_cmd ("bfd-sharing", no_class, | |
997 | &bfd_sharing, _("\ | |
998 | Set whether gdb will share bfds that appear to be the same file."), _("\ | |
999 | Show whether gdb will share bfds that appear to be the same file."), _("\ | |
1000 | When enabled gdb will reuse existing bfds rather than reopening the\n\ | |
1001 | same file. To decide if two files are the same then gdb compares the\n\ | |
1002 | filename, file size, file modification time, and file inode."), | |
1003 | NULL, | |
1004 | &show_bfd_sharing, | |
1005 | &maintenance_set_cmdlist, | |
1006 | &maintenance_show_cmdlist); | |
566f5e3b AB |
1007 | |
1008 | add_setshow_zuinteger_cmd ("bfd-cache", class_maintenance, | |
1009 | &debug_bfd_cache, _("\ | |
1010 | Set bfd cache debugging."), _("\ | |
1011 | Show bfd cache debugging."), _("\ | |
1012 | When non-zero, bfd cache specific debugging is enabled."), | |
1013 | NULL, | |
1014 | &show_bfd_cache_debug, | |
1015 | &setdebuglist, &showdebuglist); | |
d6b28940 | 1016 | } |