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