| 1 | /* Definitions for BFD wrappers used by GDB. |
| 2 | |
| 3 | Copyright (C) 2011-2019 Free Software Foundation, Inc. |
| 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" |
| 22 | #include "ui-out.h" |
| 23 | #include "gdbcmd.h" |
| 24 | #include "hashtab.h" |
| 25 | #include "gdbsupport/filestuff.h" |
| 26 | #ifdef HAVE_MMAP |
| 27 | #include <sys/mman.h> |
| 28 | #ifndef MAP_FAILED |
| 29 | #define MAP_FAILED ((void *) -1) |
| 30 | #endif |
| 31 | #endif |
| 32 | #include "target.h" |
| 33 | #include "gdb/fileio.h" |
| 34 | #include "inferior.h" |
| 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 | }; |
| 50 | |
| 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 | |
| 58 | /* An object of this type is stored in each BFD's user data. */ |
| 59 | |
| 60 | struct gdb_bfd_data |
| 61 | { |
| 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 | { |
| 86 | } |
| 87 | |
| 88 | /* The reference count. */ |
| 89 | int refc = 1; |
| 90 | |
| 91 | /* The mtime of the BFD at the point the cache entry was made. */ |
| 92 | time_t mtime; |
| 93 | |
| 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 | |
| 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 | |
| 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. */ |
| 114 | unsigned long crc = 0; |
| 115 | |
| 116 | /* If the BFD comes from an archive, this points to the archive's |
| 117 | BFD. Otherwise, this is NULL. */ |
| 118 | bfd *archive_bfd = nullptr; |
| 119 | |
| 120 | /* Table of all the bfds this bfd has included. */ |
| 121 | std::vector<gdb_bfd_ref_ptr> included_bfds; |
| 122 | |
| 123 | /* The registry. */ |
| 124 | REGISTRY_FIELDS = {}; |
| 125 | }; |
| 126 | |
| 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 | |
| 132 | /* A hash table storing all the BFDs maintained in the cache. */ |
| 133 | |
| 134 | static htab_t gdb_bfd_cache; |
| 135 | |
| 136 | /* When true gdb will reuse an existing bfd object if the filename, |
| 137 | modification time, and file size all match. */ |
| 138 | |
| 139 | static bool bfd_sharing = true; |
| 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 | |
| 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 | |
| 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; |
| 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; |
| 173 | }; |
| 174 | |
| 175 | /* A hash function for BFDs. */ |
| 176 | |
| 177 | static hashval_t |
| 178 | hash_bfd (const void *b) |
| 179 | { |
| 180 | const bfd *abfd = (const struct bfd *) b; |
| 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 | { |
| 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); |
| 196 | |
| 197 | return (gdata->mtime == s->mtime |
| 198 | && gdata->size == s->size |
| 199 | && gdata->inode == s->inode |
| 200 | && gdata->device_id == s->device_id |
| 201 | && strcmp (bfd_get_filename (abfd), s->filename) == 0); |
| 202 | } |
| 203 | |
| 204 | /* See gdb_bfd.h. */ |
| 205 | |
| 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 | |
| 274 | /* Wrapper for target_fileio_open suitable for passing as the |
| 275 | OPEN_FUNC argument to gdb_bfd_openr_iovec. The supplied |
| 276 | OPEN_CLOSURE is unused. */ |
| 277 | |
| 278 | static void * |
| 279 | gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *inferior) |
| 280 | { |
| 281 | const char *filename = bfd_get_filename (abfd); |
| 282 | int fd, target_errno; |
| 283 | int *stream; |
| 284 | |
| 285 | gdb_assert (is_target_filename (filename)); |
| 286 | |
| 287 | fd = target_fileio_open_warn_if_slow ((struct inferior *) inferior, |
| 288 | filename |
| 289 | + strlen (TARGET_SYSROOT_PREFIX), |
| 290 | FILEIO_O_RDONLY, 0, |
| 291 | &target_errno); |
| 292 | if (fd == -1) |
| 293 | { |
| 294 | errno = fileio_errno_to_host (target_errno); |
| 295 | bfd_set_error (bfd_error_system_call); |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | stream = XCNEW (int); |
| 300 | *stream = fd; |
| 301 | return stream; |
| 302 | } |
| 303 | |
| 304 | /* Wrapper for target_fileio_pread suitable for passing as the |
| 305 | PREAD_FUNC argument to gdb_bfd_openr_iovec. */ |
| 306 | |
| 307 | static file_ptr |
| 308 | gdb_bfd_iovec_fileio_pread (struct bfd *abfd, void *stream, void *buf, |
| 309 | file_ptr nbytes, file_ptr offset) |
| 310 | { |
| 311 | int fd = *(int *) stream; |
| 312 | int target_errno; |
| 313 | file_ptr pos, bytes; |
| 314 | |
| 315 | pos = 0; |
| 316 | while (nbytes > pos) |
| 317 | { |
| 318 | QUIT; |
| 319 | |
| 320 | bytes = target_fileio_pread (fd, (gdb_byte *) buf + pos, |
| 321 | nbytes - pos, offset + pos, |
| 322 | &target_errno); |
| 323 | if (bytes == 0) |
| 324 | /* Success, but no bytes, means end-of-file. */ |
| 325 | break; |
| 326 | if (bytes == -1) |
| 327 | { |
| 328 | errno = fileio_errno_to_host (target_errno); |
| 329 | bfd_set_error (bfd_error_system_call); |
| 330 | return -1; |
| 331 | } |
| 332 | |
| 333 | pos += bytes; |
| 334 | } |
| 335 | |
| 336 | return pos; |
| 337 | } |
| 338 | |
| 339 | /* Wrapper for target_fileio_close suitable for passing as the |
| 340 | CLOSE_FUNC argument to gdb_bfd_openr_iovec. */ |
| 341 | |
| 342 | static int |
| 343 | gdb_bfd_iovec_fileio_close (struct bfd *abfd, void *stream) |
| 344 | { |
| 345 | int fd = *(int *) stream; |
| 346 | int target_errno; |
| 347 | |
| 348 | xfree (stream); |
| 349 | |
| 350 | /* Ignore errors on close. These may happen with remote |
| 351 | targets if the connection has already been torn down. */ |
| 352 | target_fileio_close (fd, &target_errno); |
| 353 | |
| 354 | /* Zero means success. */ |
| 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | /* Wrapper for target_fileio_fstat suitable for passing as the |
| 359 | STAT_FUNC argument to gdb_bfd_openr_iovec. */ |
| 360 | |
| 361 | static int |
| 362 | gdb_bfd_iovec_fileio_fstat (struct bfd *abfd, void *stream, |
| 363 | struct stat *sb) |
| 364 | { |
| 365 | int fd = *(int *) stream; |
| 366 | int target_errno; |
| 367 | int result; |
| 368 | |
| 369 | result = target_fileio_fstat (fd, sb, &target_errno); |
| 370 | if (result == -1) |
| 371 | { |
| 372 | errno = fileio_errno_to_host (target_errno); |
| 373 | bfd_set_error (bfd_error_system_call); |
| 374 | } |
| 375 | |
| 376 | return result; |
| 377 | } |
| 378 | |
| 379 | /* See gdb_bfd.h. */ |
| 380 | |
| 381 | gdb_bfd_ref_ptr |
| 382 | gdb_bfd_open (const char *name, const char *target, int fd) |
| 383 | { |
| 384 | hashval_t hash; |
| 385 | void **slot; |
| 386 | bfd *abfd; |
| 387 | struct gdb_bfd_cache_search search; |
| 388 | struct stat st; |
| 389 | |
| 390 | if (is_target_filename (name)) |
| 391 | { |
| 392 | if (!target_filesystem_is_local ()) |
| 393 | { |
| 394 | gdb_assert (fd == -1); |
| 395 | |
| 396 | return gdb_bfd_openr_iovec (name, target, |
| 397 | gdb_bfd_iovec_fileio_open, |
| 398 | current_inferior (), |
| 399 | gdb_bfd_iovec_fileio_pread, |
| 400 | gdb_bfd_iovec_fileio_close, |
| 401 | gdb_bfd_iovec_fileio_fstat); |
| 402 | } |
| 403 | |
| 404 | name += strlen (TARGET_SYSROOT_PREFIX); |
| 405 | } |
| 406 | |
| 407 | if (gdb_bfd_cache == NULL) |
| 408 | gdb_bfd_cache = htab_create_alloc (1, hash_bfd, eq_bfd, NULL, |
| 409 | xcalloc, xfree); |
| 410 | |
| 411 | if (fd == -1) |
| 412 | { |
| 413 | fd = gdb_open_cloexec (name, O_RDONLY | O_BINARY, 0); |
| 414 | if (fd == -1) |
| 415 | { |
| 416 | bfd_set_error (bfd_error_system_call); |
| 417 | return NULL; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | search.filename = name; |
| 422 | if (fstat (fd, &st) < 0) |
| 423 | { |
| 424 | /* Weird situation here. */ |
| 425 | search.mtime = 0; |
| 426 | search.size = 0; |
| 427 | search.inode = 0; |
| 428 | search.device_id = 0; |
| 429 | } |
| 430 | else |
| 431 | { |
| 432 | search.mtime = st.st_mtime; |
| 433 | search.size = st.st_size; |
| 434 | search.inode = st.st_ino; |
| 435 | search.device_id = st.st_dev; |
| 436 | } |
| 437 | |
| 438 | /* Note that this must compute the same result as hash_bfd. */ |
| 439 | hash = htab_hash_string (name); |
| 440 | /* Note that we cannot use htab_find_slot_with_hash here, because |
| 441 | opening the BFD may fail; and this would violate hashtab |
| 442 | invariants. */ |
| 443 | abfd = (struct bfd *) htab_find_with_hash (gdb_bfd_cache, &search, hash); |
| 444 | if (bfd_sharing && abfd != NULL) |
| 445 | { |
| 446 | if (debug_bfd_cache) |
| 447 | fprintf_unfiltered (gdb_stdlog, |
| 448 | "Reusing cached bfd %s for %s\n", |
| 449 | host_address_to_string (abfd), |
| 450 | bfd_get_filename (abfd)); |
| 451 | close (fd); |
| 452 | return gdb_bfd_ref_ptr::new_reference (abfd); |
| 453 | } |
| 454 | |
| 455 | abfd = bfd_fopen (name, target, FOPEN_RB, fd); |
| 456 | if (abfd == NULL) |
| 457 | return NULL; |
| 458 | |
| 459 | if (debug_bfd_cache) |
| 460 | fprintf_unfiltered (gdb_stdlog, |
| 461 | "Creating new bfd %s for %s\n", |
| 462 | host_address_to_string (abfd), |
| 463 | bfd_get_filename (abfd)); |
| 464 | |
| 465 | if (bfd_sharing) |
| 466 | { |
| 467 | slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash, INSERT); |
| 468 | gdb_assert (!*slot); |
| 469 | *slot = abfd; |
| 470 | } |
| 471 | |
| 472 | return gdb_bfd_ref_ptr::new_reference (abfd); |
| 473 | } |
| 474 | |
| 475 | /* A helper function that releases any section data attached to the |
| 476 | BFD. */ |
| 477 | |
| 478 | static void |
| 479 | free_one_bfd_section (bfd *abfd, asection *sectp, void *ignore) |
| 480 | { |
| 481 | struct gdb_bfd_section_data *sect |
| 482 | = (struct gdb_bfd_section_data *) bfd_section_userdata (sectp); |
| 483 | |
| 484 | if (sect != NULL && sect->data != NULL) |
| 485 | { |
| 486 | #ifdef HAVE_MMAP |
| 487 | if (sect->map_addr != NULL) |
| 488 | { |
| 489 | int res; |
| 490 | |
| 491 | res = munmap (sect->map_addr, sect->map_len); |
| 492 | gdb_assert (res == 0); |
| 493 | } |
| 494 | else |
| 495 | #endif |
| 496 | xfree (sect->data); |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | /* Close ABFD, and warn if that fails. */ |
| 501 | |
| 502 | static int |
| 503 | gdb_bfd_close_or_warn (struct bfd *abfd) |
| 504 | { |
| 505 | int ret; |
| 506 | const char *name = bfd_get_filename (abfd); |
| 507 | |
| 508 | bfd_map_over_sections (abfd, free_one_bfd_section, NULL); |
| 509 | |
| 510 | ret = bfd_close (abfd); |
| 511 | |
| 512 | if (!ret) |
| 513 | warning (_("cannot close \"%s\": %s"), |
| 514 | name, bfd_errmsg (bfd_get_error ())); |
| 515 | |
| 516 | return ret; |
| 517 | } |
| 518 | |
| 519 | /* See gdb_bfd.h. */ |
| 520 | |
| 521 | void |
| 522 | gdb_bfd_ref (struct bfd *abfd) |
| 523 | { |
| 524 | struct gdb_bfd_data *gdata; |
| 525 | void **slot; |
| 526 | |
| 527 | if (abfd == NULL) |
| 528 | return; |
| 529 | |
| 530 | gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); |
| 531 | |
| 532 | if (debug_bfd_cache) |
| 533 | fprintf_unfiltered (gdb_stdlog, |
| 534 | "Increase reference count on bfd %s (%s)\n", |
| 535 | host_address_to_string (abfd), |
| 536 | bfd_get_filename (abfd)); |
| 537 | |
| 538 | if (gdata != NULL) |
| 539 | { |
| 540 | gdata->refc += 1; |
| 541 | return; |
| 542 | } |
| 543 | |
| 544 | /* Ask BFD to decompress sections in bfd_get_full_section_contents. */ |
| 545 | abfd->flags |= BFD_DECOMPRESS; |
| 546 | |
| 547 | gdata = new gdb_bfd_data (abfd); |
| 548 | bfd_set_usrdata (abfd, gdata); |
| 549 | bfd_alloc_data (abfd); |
| 550 | |
| 551 | /* This is the first we've seen it, so add it to the hash table. */ |
| 552 | slot = htab_find_slot (all_bfds, abfd, INSERT); |
| 553 | gdb_assert (slot && !*slot); |
| 554 | *slot = abfd; |
| 555 | } |
| 556 | |
| 557 | /* See gdb_bfd.h. */ |
| 558 | |
| 559 | void |
| 560 | gdb_bfd_unref (struct bfd *abfd) |
| 561 | { |
| 562 | struct gdb_bfd_data *gdata; |
| 563 | struct gdb_bfd_cache_search search; |
| 564 | bfd *archive_bfd; |
| 565 | |
| 566 | if (abfd == NULL) |
| 567 | return; |
| 568 | |
| 569 | gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); |
| 570 | gdb_assert (gdata->refc >= 1); |
| 571 | |
| 572 | gdata->refc -= 1; |
| 573 | if (gdata->refc > 0) |
| 574 | { |
| 575 | if (debug_bfd_cache) |
| 576 | fprintf_unfiltered (gdb_stdlog, |
| 577 | "Decrease reference count on bfd %s (%s)\n", |
| 578 | host_address_to_string (abfd), |
| 579 | bfd_get_filename (abfd)); |
| 580 | return; |
| 581 | } |
| 582 | |
| 583 | if (debug_bfd_cache) |
| 584 | fprintf_unfiltered (gdb_stdlog, |
| 585 | "Delete final reference count on bfd %s (%s)\n", |
| 586 | host_address_to_string (abfd), |
| 587 | bfd_get_filename (abfd)); |
| 588 | |
| 589 | archive_bfd = gdata->archive_bfd; |
| 590 | search.filename = bfd_get_filename (abfd); |
| 591 | |
| 592 | if (gdb_bfd_cache && search.filename) |
| 593 | { |
| 594 | hashval_t hash = htab_hash_string (search.filename); |
| 595 | void **slot; |
| 596 | |
| 597 | search.mtime = gdata->mtime; |
| 598 | search.size = gdata->size; |
| 599 | search.inode = gdata->inode; |
| 600 | search.device_id = gdata->device_id; |
| 601 | slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash, |
| 602 | NO_INSERT); |
| 603 | |
| 604 | if (slot && *slot) |
| 605 | htab_clear_slot (gdb_bfd_cache, slot); |
| 606 | } |
| 607 | |
| 608 | bfd_free_data (abfd); |
| 609 | delete gdata; |
| 610 | bfd_set_usrdata (abfd, NULL); /* Paranoia. */ |
| 611 | |
| 612 | htab_remove_elt (all_bfds, abfd); |
| 613 | |
| 614 | gdb_bfd_close_or_warn (abfd); |
| 615 | |
| 616 | gdb_bfd_unref (archive_bfd); |
| 617 | } |
| 618 | |
| 619 | /* A helper function that returns the section data descriptor |
| 620 | associated with SECTION. If no such descriptor exists, a new one |
| 621 | is allocated and cleared. */ |
| 622 | |
| 623 | static struct gdb_bfd_section_data * |
| 624 | get_section_descriptor (asection *section) |
| 625 | { |
| 626 | struct gdb_bfd_section_data *result; |
| 627 | |
| 628 | result = (struct gdb_bfd_section_data *) bfd_section_userdata (section); |
| 629 | |
| 630 | if (result == NULL) |
| 631 | { |
| 632 | result = ((struct gdb_bfd_section_data *) |
| 633 | bfd_zalloc (section->owner, sizeof (*result))); |
| 634 | bfd_set_section_userdata (section, result); |
| 635 | } |
| 636 | |
| 637 | return result; |
| 638 | } |
| 639 | |
| 640 | /* See gdb_bfd.h. */ |
| 641 | |
| 642 | const gdb_byte * |
| 643 | gdb_bfd_map_section (asection *sectp, bfd_size_type *size) |
| 644 | { |
| 645 | bfd *abfd; |
| 646 | struct gdb_bfd_section_data *descriptor; |
| 647 | bfd_byte *data; |
| 648 | |
| 649 | gdb_assert ((sectp->flags & SEC_RELOC) == 0); |
| 650 | gdb_assert (size != NULL); |
| 651 | |
| 652 | abfd = sectp->owner; |
| 653 | |
| 654 | descriptor = get_section_descriptor (sectp); |
| 655 | |
| 656 | /* If the data was already read for this BFD, just reuse it. */ |
| 657 | if (descriptor->data != NULL) |
| 658 | goto done; |
| 659 | |
| 660 | #ifdef HAVE_MMAP |
| 661 | if (!bfd_is_section_compressed (abfd, sectp)) |
| 662 | { |
| 663 | /* The page size, used when mmapping. */ |
| 664 | static int pagesize; |
| 665 | |
| 666 | if (pagesize == 0) |
| 667 | pagesize = getpagesize (); |
| 668 | |
| 669 | /* Only try to mmap sections which are large enough: we don't want |
| 670 | to waste space due to fragmentation. */ |
| 671 | |
| 672 | if (bfd_section_size (sectp) > 4 * pagesize) |
| 673 | { |
| 674 | descriptor->size = bfd_section_size (sectp); |
| 675 | descriptor->data = bfd_mmap (abfd, 0, descriptor->size, PROT_READ, |
| 676 | MAP_PRIVATE, sectp->filepos, |
| 677 | &descriptor->map_addr, |
| 678 | &descriptor->map_len); |
| 679 | |
| 680 | if ((caddr_t)descriptor->data != MAP_FAILED) |
| 681 | { |
| 682 | #if HAVE_POSIX_MADVISE |
| 683 | posix_madvise (descriptor->map_addr, descriptor->map_len, |
| 684 | POSIX_MADV_WILLNEED); |
| 685 | #endif |
| 686 | goto done; |
| 687 | } |
| 688 | |
| 689 | /* On failure, clear out the section data and try again. */ |
| 690 | memset (descriptor, 0, sizeof (*descriptor)); |
| 691 | } |
| 692 | } |
| 693 | #endif /* HAVE_MMAP */ |
| 694 | |
| 695 | /* Handle compressed sections, or ordinary uncompressed sections in |
| 696 | the no-mmap case. */ |
| 697 | |
| 698 | descriptor->size = bfd_section_size (sectp); |
| 699 | descriptor->data = NULL; |
| 700 | |
| 701 | data = NULL; |
| 702 | if (!bfd_get_full_section_contents (abfd, sectp, &data)) |
| 703 | { |
| 704 | warning (_("Can't read data for section '%s' in file '%s'"), |
| 705 | bfd_section_name (sectp), |
| 706 | bfd_get_filename (abfd)); |
| 707 | /* Set size to 0 to prevent further attempts to read the invalid |
| 708 | section. */ |
| 709 | *size = 0; |
| 710 | return NULL; |
| 711 | } |
| 712 | descriptor->data = data; |
| 713 | |
| 714 | done: |
| 715 | gdb_assert (descriptor->data != NULL); |
| 716 | *size = descriptor->size; |
| 717 | return (const gdb_byte *) descriptor->data; |
| 718 | } |
| 719 | |
| 720 | /* Return 32-bit CRC for ABFD. If successful store it to *FILE_CRC_RETURN and |
| 721 | return 1. Otherwise print a warning and return 0. ABFD seek position is |
| 722 | not preserved. */ |
| 723 | |
| 724 | static int |
| 725 | get_file_crc (bfd *abfd, unsigned long *file_crc_return) |
| 726 | { |
| 727 | unsigned long file_crc = 0; |
| 728 | |
| 729 | if (bfd_seek (abfd, 0, SEEK_SET) != 0) |
| 730 | { |
| 731 | warning (_("Problem reading \"%s\" for CRC: %s"), |
| 732 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | for (;;) |
| 737 | { |
| 738 | gdb_byte buffer[8 * 1024]; |
| 739 | bfd_size_type count; |
| 740 | |
| 741 | count = bfd_bread (buffer, sizeof (buffer), abfd); |
| 742 | if (count == (bfd_size_type) -1) |
| 743 | { |
| 744 | warning (_("Problem reading \"%s\" for CRC: %s"), |
| 745 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
| 746 | return 0; |
| 747 | } |
| 748 | if (count == 0) |
| 749 | break; |
| 750 | file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count); |
| 751 | } |
| 752 | |
| 753 | *file_crc_return = file_crc; |
| 754 | return 1; |
| 755 | } |
| 756 | |
| 757 | /* See gdb_bfd.h. */ |
| 758 | |
| 759 | int |
| 760 | gdb_bfd_crc (struct bfd *abfd, unsigned long *crc_out) |
| 761 | { |
| 762 | struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); |
| 763 | |
| 764 | if (!gdata->crc_computed) |
| 765 | gdata->crc_computed = get_file_crc (abfd, &gdata->crc); |
| 766 | |
| 767 | if (gdata->crc_computed) |
| 768 | *crc_out = gdata->crc; |
| 769 | return gdata->crc_computed; |
| 770 | } |
| 771 | |
| 772 | \f |
| 773 | |
| 774 | /* See gdb_bfd.h. */ |
| 775 | |
| 776 | gdb_bfd_ref_ptr |
| 777 | gdb_bfd_fopen (const char *filename, const char *target, const char *mode, |
| 778 | int fd) |
| 779 | { |
| 780 | bfd *result = bfd_fopen (filename, target, mode, fd); |
| 781 | |
| 782 | return gdb_bfd_ref_ptr::new_reference (result); |
| 783 | } |
| 784 | |
| 785 | /* See gdb_bfd.h. */ |
| 786 | |
| 787 | gdb_bfd_ref_ptr |
| 788 | gdb_bfd_openr (const char *filename, const char *target) |
| 789 | { |
| 790 | bfd *result = bfd_openr (filename, target); |
| 791 | |
| 792 | return gdb_bfd_ref_ptr::new_reference (result); |
| 793 | } |
| 794 | |
| 795 | /* See gdb_bfd.h. */ |
| 796 | |
| 797 | gdb_bfd_ref_ptr |
| 798 | gdb_bfd_openw (const char *filename, const char *target) |
| 799 | { |
| 800 | bfd *result = bfd_openw (filename, target); |
| 801 | |
| 802 | return gdb_bfd_ref_ptr::new_reference (result); |
| 803 | } |
| 804 | |
| 805 | /* See gdb_bfd.h. */ |
| 806 | |
| 807 | gdb_bfd_ref_ptr |
| 808 | gdb_bfd_openr_iovec (const char *filename, const char *target, |
| 809 | void *(*open_func) (struct bfd *nbfd, |
| 810 | void *open_closure), |
| 811 | void *open_closure, |
| 812 | file_ptr (*pread_func) (struct bfd *nbfd, |
| 813 | void *stream, |
| 814 | void *buf, |
| 815 | file_ptr nbytes, |
| 816 | file_ptr offset), |
| 817 | int (*close_func) (struct bfd *nbfd, |
| 818 | void *stream), |
| 819 | int (*stat_func) (struct bfd *abfd, |
| 820 | void *stream, |
| 821 | struct stat *sb)) |
| 822 | { |
| 823 | bfd *result = bfd_openr_iovec (filename, target, |
| 824 | open_func, open_closure, |
| 825 | pread_func, close_func, stat_func); |
| 826 | |
| 827 | return gdb_bfd_ref_ptr::new_reference (result); |
| 828 | } |
| 829 | |
| 830 | /* See gdb_bfd.h. */ |
| 831 | |
| 832 | void |
| 833 | gdb_bfd_mark_parent (bfd *child, bfd *parent) |
| 834 | { |
| 835 | struct gdb_bfd_data *gdata; |
| 836 | |
| 837 | gdb_bfd_ref (child); |
| 838 | /* No need to stash the filename here, because we also keep a |
| 839 | reference on the parent archive. */ |
| 840 | |
| 841 | gdata = (struct gdb_bfd_data *) bfd_usrdata (child); |
| 842 | if (gdata->archive_bfd == NULL) |
| 843 | { |
| 844 | gdata->archive_bfd = parent; |
| 845 | gdb_bfd_ref (parent); |
| 846 | } |
| 847 | else |
| 848 | gdb_assert (gdata->archive_bfd == parent); |
| 849 | } |
| 850 | |
| 851 | /* See gdb_bfd.h. */ |
| 852 | |
| 853 | gdb_bfd_ref_ptr |
| 854 | gdb_bfd_openr_next_archived_file (bfd *archive, bfd *previous) |
| 855 | { |
| 856 | bfd *result = bfd_openr_next_archived_file (archive, previous); |
| 857 | |
| 858 | if (result) |
| 859 | gdb_bfd_mark_parent (result, archive); |
| 860 | |
| 861 | return gdb_bfd_ref_ptr (result); |
| 862 | } |
| 863 | |
| 864 | /* See gdb_bfd.h. */ |
| 865 | |
| 866 | void |
| 867 | gdb_bfd_record_inclusion (bfd *includer, bfd *includee) |
| 868 | { |
| 869 | struct gdb_bfd_data *gdata; |
| 870 | |
| 871 | gdata = (struct gdb_bfd_data *) bfd_usrdata (includer); |
| 872 | gdata->included_bfds.push_back (gdb_bfd_ref_ptr::new_reference (includee)); |
| 873 | } |
| 874 | |
| 875 | \f |
| 876 | |
| 877 | gdb_static_assert (ARRAY_SIZE (_bfd_std_section) == 4); |
| 878 | |
| 879 | /* See gdb_bfd.h. */ |
| 880 | |
| 881 | int |
| 882 | gdb_bfd_section_index (bfd *abfd, asection *section) |
| 883 | { |
| 884 | if (section == NULL) |
| 885 | return -1; |
| 886 | else if (section == bfd_com_section_ptr) |
| 887 | return bfd_count_sections (abfd); |
| 888 | else if (section == bfd_und_section_ptr) |
| 889 | return bfd_count_sections (abfd) + 1; |
| 890 | else if (section == bfd_abs_section_ptr) |
| 891 | return bfd_count_sections (abfd) + 2; |
| 892 | else if (section == bfd_ind_section_ptr) |
| 893 | return bfd_count_sections (abfd) + 3; |
| 894 | return section->index; |
| 895 | } |
| 896 | |
| 897 | /* See gdb_bfd.h. */ |
| 898 | |
| 899 | int |
| 900 | gdb_bfd_count_sections (bfd *abfd) |
| 901 | { |
| 902 | return bfd_count_sections (abfd) + 4; |
| 903 | } |
| 904 | |
| 905 | /* See gdb_bfd.h. */ |
| 906 | |
| 907 | int |
| 908 | gdb_bfd_requires_relocations (bfd *abfd) |
| 909 | { |
| 910 | struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); |
| 911 | |
| 912 | if (gdata->relocation_computed == 0) |
| 913 | { |
| 914 | asection *sect; |
| 915 | |
| 916 | for (sect = abfd->sections; sect != NULL; sect = sect->next) |
| 917 | if ((sect->flags & SEC_RELOC) != 0) |
| 918 | { |
| 919 | gdata->needs_relocations = 1; |
| 920 | break; |
| 921 | } |
| 922 | |
| 923 | gdata->relocation_computed = 1; |
| 924 | } |
| 925 | |
| 926 | return gdata->needs_relocations; |
| 927 | } |
| 928 | |
| 929 | \f |
| 930 | |
| 931 | /* A callback for htab_traverse that prints a single BFD. */ |
| 932 | |
| 933 | static int |
| 934 | print_one_bfd (void **slot, void *data) |
| 935 | { |
| 936 | bfd *abfd = (struct bfd *) *slot; |
| 937 | struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd); |
| 938 | struct ui_out *uiout = (struct ui_out *) data; |
| 939 | |
| 940 | ui_out_emit_tuple tuple_emitter (uiout, NULL); |
| 941 | uiout->field_signed ("refcount", gdata->refc); |
| 942 | uiout->field_string ("addr", host_address_to_string (abfd)); |
| 943 | uiout->field_string ("filename", bfd_get_filename (abfd)); |
| 944 | uiout->text ("\n"); |
| 945 | |
| 946 | return 1; |
| 947 | } |
| 948 | |
| 949 | /* Implement the 'maint info bfd' command. */ |
| 950 | |
| 951 | static void |
| 952 | maintenance_info_bfds (const char *arg, int from_tty) |
| 953 | { |
| 954 | struct ui_out *uiout = current_uiout; |
| 955 | |
| 956 | ui_out_emit_table table_emitter (uiout, 3, -1, "bfds"); |
| 957 | uiout->table_header (10, ui_left, "refcount", "Refcount"); |
| 958 | uiout->table_header (18, ui_left, "addr", "Address"); |
| 959 | uiout->table_header (40, ui_left, "filename", "Filename"); |
| 960 | |
| 961 | uiout->table_body (); |
| 962 | htab_traverse (all_bfds, print_one_bfd, uiout); |
| 963 | } |
| 964 | |
| 965 | void |
| 966 | _initialize_gdb_bfd (void) |
| 967 | { |
| 968 | all_bfds = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer, |
| 969 | NULL, xcalloc, xfree); |
| 970 | |
| 971 | add_cmd ("bfds", class_maintenance, maintenance_info_bfds, _("\ |
| 972 | List the BFDs that are currently open."), |
| 973 | &maintenanceinfolist); |
| 974 | |
| 975 | add_setshow_boolean_cmd ("bfd-sharing", no_class, |
| 976 | &bfd_sharing, _("\ |
| 977 | Set whether gdb will share bfds that appear to be the same file."), _("\ |
| 978 | Show whether gdb will share bfds that appear to be the same file."), _("\ |
| 979 | When enabled gdb will reuse existing bfds rather than reopening the\n\ |
| 980 | same file. To decide if two files are the same then gdb compares the\n\ |
| 981 | filename, file size, file modification time, and file inode."), |
| 982 | NULL, |
| 983 | &show_bfd_sharing, |
| 984 | &maintenance_set_cmdlist, |
| 985 | &maintenance_show_cmdlist); |
| 986 | |
| 987 | add_setshow_zuinteger_cmd ("bfd-cache", class_maintenance, |
| 988 | &debug_bfd_cache, _("\ |
| 989 | Set bfd cache debugging."), _("\ |
| 990 | Show bfd cache debugging."), _("\ |
| 991 | When non-zero, bfd cache specific debugging is enabled."), |
| 992 | NULL, |
| 993 | &show_bfd_cache_debug, |
| 994 | &setdebuglist, &showdebuglist); |
| 995 | } |