| 1 | /* opncls.c -- open and close a BFD. |
| 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, |
| 3 | 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | Written by Cygnus Support. |
| 7 | |
| 8 | This file is part of BFD, the Binary File Descriptor library. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 3 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 23 | MA 02110-1301, USA. */ |
| 24 | |
| 25 | #include "sysdep.h" |
| 26 | #include "bfd.h" |
| 27 | #include "objalloc.h" |
| 28 | #include "libbfd.h" |
| 29 | #include "libiberty.h" |
| 30 | |
| 31 | #ifndef S_IXUSR |
| 32 | #define S_IXUSR 0100 /* Execute by owner. */ |
| 33 | #endif |
| 34 | #ifndef S_IXGRP |
| 35 | #define S_IXGRP 0010 /* Execute by group. */ |
| 36 | #endif |
| 37 | #ifndef S_IXOTH |
| 38 | #define S_IXOTH 0001 /* Execute by others. */ |
| 39 | #endif |
| 40 | |
| 41 | /* Counters used to initialize the bfd identifier. */ |
| 42 | |
| 43 | static unsigned int bfd_id_counter = 0; |
| 44 | static unsigned int bfd_reserved_id_counter = 0; |
| 45 | |
| 46 | /* |
| 47 | CODE_FRAGMENT |
| 48 | .{* Set to N to open the next N BFDs using an alternate id space. *} |
| 49 | .extern unsigned int bfd_use_reserved_id; |
| 50 | */ |
| 51 | unsigned int bfd_use_reserved_id = 0; |
| 52 | |
| 53 | /* fdopen is a loser -- we should use stdio exclusively. Unfortunately |
| 54 | if we do that we can't use fcntl. */ |
| 55 | |
| 56 | /* Return a new BFD. All BFD's are allocated through this routine. */ |
| 57 | |
| 58 | bfd * |
| 59 | _bfd_new_bfd (void) |
| 60 | { |
| 61 | bfd *nbfd; |
| 62 | |
| 63 | nbfd = (bfd *) bfd_zmalloc (sizeof (bfd)); |
| 64 | if (nbfd == NULL) |
| 65 | return NULL; |
| 66 | |
| 67 | if (bfd_use_reserved_id) |
| 68 | { |
| 69 | nbfd->id = --bfd_reserved_id_counter; |
| 70 | --bfd_use_reserved_id; |
| 71 | } |
| 72 | else |
| 73 | nbfd->id = bfd_id_counter++; |
| 74 | |
| 75 | nbfd->memory = objalloc_create (); |
| 76 | if (nbfd->memory == NULL) |
| 77 | { |
| 78 | bfd_set_error (bfd_error_no_memory); |
| 79 | free (nbfd); |
| 80 | return NULL; |
| 81 | } |
| 82 | |
| 83 | nbfd->arch_info = &bfd_default_arch_struct; |
| 84 | |
| 85 | nbfd->direction = no_direction; |
| 86 | nbfd->iostream = NULL; |
| 87 | nbfd->where = 0; |
| 88 | if (!bfd_hash_table_init_n (& nbfd->section_htab, bfd_section_hash_newfunc, |
| 89 | sizeof (struct section_hash_entry), 251)) |
| 90 | { |
| 91 | free (nbfd); |
| 92 | return NULL; |
| 93 | } |
| 94 | nbfd->sections = NULL; |
| 95 | nbfd->section_last = NULL; |
| 96 | nbfd->format = bfd_unknown; |
| 97 | nbfd->my_archive = NULL; |
| 98 | nbfd->origin = 0; |
| 99 | nbfd->opened_once = FALSE; |
| 100 | nbfd->output_has_begun = FALSE; |
| 101 | nbfd->section_count = 0; |
| 102 | nbfd->usrdata = NULL; |
| 103 | nbfd->cacheable = FALSE; |
| 104 | nbfd->flags = BFD_NO_FLAGS; |
| 105 | nbfd->mtime_set = FALSE; |
| 106 | |
| 107 | return nbfd; |
| 108 | } |
| 109 | |
| 110 | static const struct bfd_iovec opncls_iovec; |
| 111 | |
| 112 | /* Allocate a new BFD as a member of archive OBFD. */ |
| 113 | |
| 114 | bfd * |
| 115 | _bfd_new_bfd_contained_in (bfd *obfd) |
| 116 | { |
| 117 | bfd *nbfd; |
| 118 | |
| 119 | nbfd = _bfd_new_bfd (); |
| 120 | if (nbfd == NULL) |
| 121 | return NULL; |
| 122 | nbfd->xvec = obfd->xvec; |
| 123 | nbfd->iovec = obfd->iovec; |
| 124 | if (obfd->iovec == &opncls_iovec) |
| 125 | nbfd->iostream = obfd->iostream; |
| 126 | nbfd->my_archive = obfd; |
| 127 | nbfd->direction = read_direction; |
| 128 | nbfd->target_defaulted = obfd->target_defaulted; |
| 129 | return nbfd; |
| 130 | } |
| 131 | |
| 132 | /* Delete a BFD. */ |
| 133 | |
| 134 | static void |
| 135 | _bfd_delete_bfd (bfd *abfd) |
| 136 | { |
| 137 | if (abfd->memory) |
| 138 | { |
| 139 | bfd_hash_table_free (&abfd->section_htab); |
| 140 | objalloc_free ((struct objalloc *) abfd->memory); |
| 141 | } |
| 142 | |
| 143 | free (abfd->arelt_data); |
| 144 | free (abfd); |
| 145 | } |
| 146 | |
| 147 | /* Free objalloc memory. */ |
| 148 | |
| 149 | bfd_boolean |
| 150 | _bfd_free_cached_info (bfd *abfd) |
| 151 | { |
| 152 | if (abfd->memory) |
| 153 | { |
| 154 | bfd_hash_table_free (&abfd->section_htab); |
| 155 | objalloc_free ((struct objalloc *) abfd->memory); |
| 156 | |
| 157 | abfd->sections = NULL; |
| 158 | abfd->section_last = NULL; |
| 159 | abfd->outsymbols = NULL; |
| 160 | abfd->tdata.any = NULL; |
| 161 | abfd->usrdata = NULL; |
| 162 | abfd->memory = NULL; |
| 163 | } |
| 164 | |
| 165 | return TRUE; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | SECTION |
| 170 | Opening and closing BFDs |
| 171 | |
| 172 | SUBSECTION |
| 173 | Functions for opening and closing |
| 174 | */ |
| 175 | |
| 176 | /* |
| 177 | FUNCTION |
| 178 | bfd_fopen |
| 179 | |
| 180 | SYNOPSIS |
| 181 | bfd *bfd_fopen (const char *filename, const char *target, |
| 182 | const char *mode, int fd); |
| 183 | |
| 184 | DESCRIPTION |
| 185 | Open the file @var{filename} with the target @var{target}. |
| 186 | Return a pointer to the created BFD. If @var{fd} is not -1, |
| 187 | then <<fdopen>> is used to open the file; otherwise, <<fopen>> |
| 188 | is used. @var{mode} is passed directly to <<fopen>> or |
| 189 | <<fdopen>>. |
| 190 | |
| 191 | Calls <<bfd_find_target>>, so @var{target} is interpreted as by |
| 192 | that function. |
| 193 | |
| 194 | The new BFD is marked as cacheable iff @var{fd} is -1. |
| 195 | |
| 196 | If <<NULL>> is returned then an error has occured. Possible errors |
| 197 | are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or |
| 198 | <<system_call>> error. |
| 199 | |
| 200 | On error, @var{fd} is always closed. |
| 201 | */ |
| 202 | |
| 203 | bfd * |
| 204 | bfd_fopen (const char *filename, const char *target, const char *mode, int fd) |
| 205 | { |
| 206 | bfd *nbfd; |
| 207 | const bfd_target *target_vec; |
| 208 | |
| 209 | nbfd = _bfd_new_bfd (); |
| 210 | if (nbfd == NULL) |
| 211 | { |
| 212 | if (fd != -1) |
| 213 | close (fd); |
| 214 | return NULL; |
| 215 | } |
| 216 | |
| 217 | target_vec = bfd_find_target (target, nbfd); |
| 218 | if (target_vec == NULL) |
| 219 | { |
| 220 | if (fd != -1) |
| 221 | close (fd); |
| 222 | _bfd_delete_bfd (nbfd); |
| 223 | return NULL; |
| 224 | } |
| 225 | |
| 226 | #ifdef HAVE_FDOPEN |
| 227 | if (fd != -1) |
| 228 | nbfd->iostream = fdopen (fd, mode); |
| 229 | else |
| 230 | #endif |
| 231 | nbfd->iostream = real_fopen (filename, mode); |
| 232 | if (nbfd->iostream == NULL) |
| 233 | { |
| 234 | bfd_set_error (bfd_error_system_call); |
| 235 | _bfd_delete_bfd (nbfd); |
| 236 | return NULL; |
| 237 | } |
| 238 | |
| 239 | /* OK, put everything where it belongs. */ |
| 240 | nbfd->filename = filename; |
| 241 | |
| 242 | /* Figure out whether the user is opening the file for reading, |
| 243 | writing, or both, by looking at the MODE argument. */ |
| 244 | if ((mode[0] == 'r' || mode[0] == 'w' || mode[0] == 'a') |
| 245 | && mode[1] == '+') |
| 246 | nbfd->direction = both_direction; |
| 247 | else if (mode[0] == 'r') |
| 248 | nbfd->direction = read_direction; |
| 249 | else |
| 250 | nbfd->direction = write_direction; |
| 251 | |
| 252 | if (! bfd_cache_init (nbfd)) |
| 253 | { |
| 254 | _bfd_delete_bfd (nbfd); |
| 255 | return NULL; |
| 256 | } |
| 257 | nbfd->opened_once = TRUE; |
| 258 | /* If we opened the file by name, mark it cacheable; we can close it |
| 259 | and reopen it later. However, if a file descriptor was provided, |
| 260 | then it may have been opened with special flags that make it |
| 261 | unsafe to close and reopen the file. */ |
| 262 | if (fd == -1) |
| 263 | bfd_set_cacheable (nbfd, TRUE); |
| 264 | |
| 265 | return nbfd; |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | FUNCTION |
| 270 | bfd_openr |
| 271 | |
| 272 | SYNOPSIS |
| 273 | bfd *bfd_openr (const char *filename, const char *target); |
| 274 | |
| 275 | DESCRIPTION |
| 276 | Open the file @var{filename} (using <<fopen>>) with the target |
| 277 | @var{target}. Return a pointer to the created BFD. |
| 278 | |
| 279 | Calls <<bfd_find_target>>, so @var{target} is interpreted as by |
| 280 | that function. |
| 281 | |
| 282 | If <<NULL>> is returned then an error has occured. Possible errors |
| 283 | are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or |
| 284 | <<system_call>> error. |
| 285 | */ |
| 286 | |
| 287 | bfd * |
| 288 | bfd_openr (const char *filename, const char *target) |
| 289 | { |
| 290 | return bfd_fopen (filename, target, FOPEN_RB, -1); |
| 291 | } |
| 292 | |
| 293 | /* Don't try to `optimize' this function: |
| 294 | |
| 295 | o - We lock using stack space so that interrupting the locking |
| 296 | won't cause a storage leak. |
| 297 | o - We open the file stream last, since we don't want to have to |
| 298 | close it if anything goes wrong. Closing the stream means closing |
| 299 | the file descriptor too, even though we didn't open it. */ |
| 300 | /* |
| 301 | FUNCTION |
| 302 | bfd_fdopenr |
| 303 | |
| 304 | SYNOPSIS |
| 305 | bfd *bfd_fdopenr (const char *filename, const char *target, int fd); |
| 306 | |
| 307 | DESCRIPTION |
| 308 | <<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to |
| 309 | <<fopen>>. It opens a BFD on a file already described by the |
| 310 | @var{fd} supplied. |
| 311 | |
| 312 | When the file is later <<bfd_close>>d, the file descriptor will |
| 313 | be closed. If the caller desires that this file descriptor be |
| 314 | cached by BFD (opened as needed, closed as needed to free |
| 315 | descriptors for other opens), with the supplied @var{fd} used as |
| 316 | an initial file descriptor (but subject to closure at any time), |
| 317 | call bfd_set_cacheable(bfd, 1) on the returned BFD. The default |
| 318 | is to assume no caching; the file descriptor will remain open |
| 319 | until <<bfd_close>>, and will not be affected by BFD operations |
| 320 | on other files. |
| 321 | |
| 322 | Possible errors are <<bfd_error_no_memory>>, |
| 323 | <<bfd_error_invalid_target>> and <<bfd_error_system_call>>. |
| 324 | |
| 325 | On error, @var{fd} is closed. |
| 326 | */ |
| 327 | |
| 328 | bfd * |
| 329 | bfd_fdopenr (const char *filename, const char *target, int fd) |
| 330 | { |
| 331 | const char *mode; |
| 332 | #if defined(HAVE_FCNTL) && defined(F_GETFL) |
| 333 | int fdflags; |
| 334 | #endif |
| 335 | |
| 336 | #if ! defined(HAVE_FCNTL) || ! defined(F_GETFL) |
| 337 | mode = FOPEN_RUB; /* Assume full access. */ |
| 338 | #else |
| 339 | fdflags = fcntl (fd, F_GETFL, NULL); |
| 340 | if (fdflags == -1) |
| 341 | { |
| 342 | int save = errno; |
| 343 | |
| 344 | close (fd); |
| 345 | errno = save; |
| 346 | bfd_set_error (bfd_error_system_call); |
| 347 | return NULL; |
| 348 | } |
| 349 | |
| 350 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ |
| 351 | switch (fdflags & (O_ACCMODE)) |
| 352 | { |
| 353 | case O_RDONLY: mode = FOPEN_RB; break; |
| 354 | case O_WRONLY: mode = FOPEN_RUB; break; |
| 355 | case O_RDWR: mode = FOPEN_RUB; break; |
| 356 | default: abort (); |
| 357 | } |
| 358 | #endif |
| 359 | |
| 360 | return bfd_fopen (filename, target, mode, fd); |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | FUNCTION |
| 365 | bfd_openstreamr |
| 366 | |
| 367 | SYNOPSIS |
| 368 | bfd *bfd_openstreamr (const char *, const char *, void *); |
| 369 | |
| 370 | DESCRIPTION |
| 371 | |
| 372 | Open a BFD for read access on an existing stdio stream. When |
| 373 | the BFD is passed to <<bfd_close>>, the stream will be closed. |
| 374 | */ |
| 375 | |
| 376 | bfd * |
| 377 | bfd_openstreamr (const char *filename, const char *target, void *streamarg) |
| 378 | { |
| 379 | FILE *stream = (FILE *) streamarg; |
| 380 | bfd *nbfd; |
| 381 | const bfd_target *target_vec; |
| 382 | |
| 383 | nbfd = _bfd_new_bfd (); |
| 384 | if (nbfd == NULL) |
| 385 | return NULL; |
| 386 | |
| 387 | target_vec = bfd_find_target (target, nbfd); |
| 388 | if (target_vec == NULL) |
| 389 | { |
| 390 | _bfd_delete_bfd (nbfd); |
| 391 | return NULL; |
| 392 | } |
| 393 | |
| 394 | nbfd->iostream = stream; |
| 395 | nbfd->filename = filename; |
| 396 | nbfd->direction = read_direction; |
| 397 | |
| 398 | if (! bfd_cache_init (nbfd)) |
| 399 | { |
| 400 | _bfd_delete_bfd (nbfd); |
| 401 | return NULL; |
| 402 | } |
| 403 | |
| 404 | return nbfd; |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | FUNCTION |
| 409 | bfd_openr_iovec |
| 410 | |
| 411 | SYNOPSIS |
| 412 | bfd *bfd_openr_iovec (const char *filename, const char *target, |
| 413 | void *(*open_func) (struct bfd *nbfd, |
| 414 | void *open_closure), |
| 415 | void *open_closure, |
| 416 | file_ptr (*pread_func) (struct bfd *nbfd, |
| 417 | void *stream, |
| 418 | void *buf, |
| 419 | file_ptr nbytes, |
| 420 | file_ptr offset), |
| 421 | int (*close_func) (struct bfd *nbfd, |
| 422 | void *stream), |
| 423 | int (*stat_func) (struct bfd *abfd, |
| 424 | void *stream, |
| 425 | struct stat *sb)); |
| 426 | |
| 427 | DESCRIPTION |
| 428 | |
| 429 | Create and return a BFD backed by a read-only @var{stream}. |
| 430 | The @var{stream} is created using @var{open_func}, accessed using |
| 431 | @var{pread_func} and destroyed using @var{close_func}. |
| 432 | |
| 433 | Calls <<bfd_find_target>>, so @var{target} is interpreted as by |
| 434 | that function. |
| 435 | |
| 436 | Calls @var{open_func} (which can call <<bfd_zalloc>> and |
| 437 | <<bfd_get_filename>>) to obtain the read-only stream backing |
| 438 | the BFD. @var{open_func} either succeeds returning the |
| 439 | non-<<NULL>> @var{stream}, or fails returning <<NULL>> |
| 440 | (setting <<bfd_error>>). |
| 441 | |
| 442 | Calls @var{pread_func} to request @var{nbytes} of data from |
| 443 | @var{stream} starting at @var{offset} (e.g., via a call to |
| 444 | <<bfd_read>>). @var{pread_func} either succeeds returning the |
| 445 | number of bytes read (which can be less than @var{nbytes} when |
| 446 | end-of-file), or fails returning -1 (setting <<bfd_error>>). |
| 447 | |
| 448 | Calls @var{close_func} when the BFD is later closed using |
| 449 | <<bfd_close>>. @var{close_func} either succeeds returning 0, or |
| 450 | fails returning -1 (setting <<bfd_error>>). |
| 451 | |
| 452 | Calls @var{stat_func} to fill in a stat structure for bfd_stat, |
| 453 | bfd_get_size, and bfd_get_mtime calls. @var{stat_func} returns 0 |
| 454 | on success, or returns -1 on failure (setting <<bfd_error>>). |
| 455 | |
| 456 | If <<bfd_openr_iovec>> returns <<NULL>> then an error has |
| 457 | occurred. Possible errors are <<bfd_error_no_memory>>, |
| 458 | <<bfd_error_invalid_target>> and <<bfd_error_system_call>>. |
| 459 | |
| 460 | */ |
| 461 | |
| 462 | struct opncls |
| 463 | { |
| 464 | void *stream; |
| 465 | file_ptr (*pread) (struct bfd *abfd, void *stream, void *buf, |
| 466 | file_ptr nbytes, file_ptr offset); |
| 467 | int (*close) (struct bfd *abfd, void *stream); |
| 468 | int (*stat) (struct bfd *abfd, void *stream, struct stat *sb); |
| 469 | file_ptr where; |
| 470 | }; |
| 471 | |
| 472 | static file_ptr |
| 473 | opncls_btell (struct bfd *abfd) |
| 474 | { |
| 475 | struct opncls *vec = (struct opncls *) abfd->iostream; |
| 476 | return vec->where; |
| 477 | } |
| 478 | |
| 479 | static int |
| 480 | opncls_bseek (struct bfd *abfd, file_ptr offset, int whence) |
| 481 | { |
| 482 | struct opncls *vec = (struct opncls *) abfd->iostream; |
| 483 | switch (whence) |
| 484 | { |
| 485 | case SEEK_SET: vec->where = offset; break; |
| 486 | case SEEK_CUR: vec->where += offset; break; |
| 487 | case SEEK_END: return -1; |
| 488 | } |
| 489 | return 0; |
| 490 | } |
| 491 | |
| 492 | static file_ptr |
| 493 | opncls_bread (struct bfd *abfd, void *buf, file_ptr nbytes) |
| 494 | { |
| 495 | struct opncls *vec = (struct opncls *) abfd->iostream; |
| 496 | file_ptr nread = (vec->pread) (abfd, vec->stream, buf, nbytes, vec->where); |
| 497 | if (nread < 0) |
| 498 | return nread; |
| 499 | vec->where += nread; |
| 500 | return nread; |
| 501 | } |
| 502 | |
| 503 | static file_ptr |
| 504 | opncls_bwrite (struct bfd *abfd ATTRIBUTE_UNUSED, |
| 505 | const void *where ATTRIBUTE_UNUSED, |
| 506 | file_ptr nbytes ATTRIBUTE_UNUSED) |
| 507 | { |
| 508 | return -1; |
| 509 | } |
| 510 | |
| 511 | static bfd_boolean |
| 512 | opncls_bclose (struct bfd *abfd) |
| 513 | { |
| 514 | struct opncls *vec = (struct opncls *) abfd->iostream; |
| 515 | /* Since the VEC's memory is bound to the bfd deleting the bfd will |
| 516 | free it. */ |
| 517 | int status = 0; |
| 518 | if (vec->close != NULL) |
| 519 | status = (vec->close) (abfd, vec->stream); |
| 520 | abfd->iostream = NULL; |
| 521 | return status == 0; |
| 522 | } |
| 523 | |
| 524 | static int |
| 525 | opncls_bflush (struct bfd *abfd ATTRIBUTE_UNUSED) |
| 526 | { |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | static int |
| 531 | opncls_bstat (struct bfd *abfd, struct stat *sb) |
| 532 | { |
| 533 | struct opncls *vec = (struct opncls *) abfd->iostream; |
| 534 | |
| 535 | memset (sb, 0, sizeof (*sb)); |
| 536 | if (vec->stat == NULL) |
| 537 | return 0; |
| 538 | |
| 539 | return (vec->stat) (abfd, vec->stream, sb); |
| 540 | } |
| 541 | |
| 542 | static void * |
| 543 | opncls_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED, |
| 544 | void *addr ATTRIBUTE_UNUSED, |
| 545 | bfd_size_type len ATTRIBUTE_UNUSED, |
| 546 | int prot ATTRIBUTE_UNUSED, |
| 547 | int flags ATTRIBUTE_UNUSED, |
| 548 | file_ptr offset ATTRIBUTE_UNUSED, |
| 549 | void **map_addr ATTRIBUTE_UNUSED, |
| 550 | bfd_size_type *map_len ATTRIBUTE_UNUSED) |
| 551 | { |
| 552 | return (void *) -1; |
| 553 | } |
| 554 | |
| 555 | static const struct bfd_iovec opncls_iovec = { |
| 556 | &opncls_bread, &opncls_bwrite, &opncls_btell, &opncls_bseek, |
| 557 | &opncls_bclose, &opncls_bflush, &opncls_bstat, &opncls_bmmap |
| 558 | }; |
| 559 | |
| 560 | bfd * |
| 561 | bfd_openr_iovec (const char *filename, const char *target, |
| 562 | void *(*open_p) (struct bfd *, void *), |
| 563 | void *open_closure, |
| 564 | file_ptr (*pread_p) (struct bfd *, void *, void *, |
| 565 | file_ptr, file_ptr), |
| 566 | int (*close_p) (struct bfd *, void *), |
| 567 | int (*stat_p) (struct bfd *, void *, struct stat *)) |
| 568 | { |
| 569 | bfd *nbfd; |
| 570 | const bfd_target *target_vec; |
| 571 | struct opncls *vec; |
| 572 | void *stream; |
| 573 | |
| 574 | nbfd = _bfd_new_bfd (); |
| 575 | if (nbfd == NULL) |
| 576 | return NULL; |
| 577 | |
| 578 | target_vec = bfd_find_target (target, nbfd); |
| 579 | if (target_vec == NULL) |
| 580 | { |
| 581 | _bfd_delete_bfd (nbfd); |
| 582 | return NULL; |
| 583 | } |
| 584 | |
| 585 | nbfd->filename = filename; |
| 586 | nbfd->direction = read_direction; |
| 587 | |
| 588 | /* `open_p (...)' would get expanded by an the open(2) syscall macro. */ |
| 589 | stream = (*open_p) (nbfd, open_closure); |
| 590 | if (stream == NULL) |
| 591 | { |
| 592 | _bfd_delete_bfd (nbfd); |
| 593 | return NULL; |
| 594 | } |
| 595 | |
| 596 | vec = (struct opncls *) bfd_zalloc (nbfd, sizeof (struct opncls)); |
| 597 | vec->stream = stream; |
| 598 | vec->pread = pread_p; |
| 599 | vec->close = close_p; |
| 600 | vec->stat = stat_p; |
| 601 | |
| 602 | nbfd->iovec = &opncls_iovec; |
| 603 | nbfd->iostream = vec; |
| 604 | |
| 605 | return nbfd; |
| 606 | } |
| 607 | \f |
| 608 | /* bfd_openw -- open for writing. |
| 609 | Returns a pointer to a freshly-allocated BFD on success, or NULL. |
| 610 | |
| 611 | See comment by bfd_fdopenr before you try to modify this function. */ |
| 612 | |
| 613 | /* |
| 614 | FUNCTION |
| 615 | bfd_openw |
| 616 | |
| 617 | SYNOPSIS |
| 618 | bfd *bfd_openw (const char *filename, const char *target); |
| 619 | |
| 620 | DESCRIPTION |
| 621 | Create a BFD, associated with file @var{filename}, using the |
| 622 | file format @var{target}, and return a pointer to it. |
| 623 | |
| 624 | Possible errors are <<bfd_error_system_call>>, <<bfd_error_no_memory>>, |
| 625 | <<bfd_error_invalid_target>>. |
| 626 | */ |
| 627 | |
| 628 | bfd * |
| 629 | bfd_openw (const char *filename, const char *target) |
| 630 | { |
| 631 | bfd *nbfd; |
| 632 | const bfd_target *target_vec; |
| 633 | |
| 634 | /* nbfd has to point to head of malloc'ed block so that bfd_close may |
| 635 | reclaim it correctly. */ |
| 636 | nbfd = _bfd_new_bfd (); |
| 637 | if (nbfd == NULL) |
| 638 | return NULL; |
| 639 | |
| 640 | target_vec = bfd_find_target (target, nbfd); |
| 641 | if (target_vec == NULL) |
| 642 | { |
| 643 | _bfd_delete_bfd (nbfd); |
| 644 | return NULL; |
| 645 | } |
| 646 | |
| 647 | nbfd->filename = filename; |
| 648 | nbfd->direction = write_direction; |
| 649 | |
| 650 | if (bfd_open_file (nbfd) == NULL) |
| 651 | { |
| 652 | /* File not writeable, etc. */ |
| 653 | bfd_set_error (bfd_error_system_call); |
| 654 | _bfd_delete_bfd (nbfd); |
| 655 | return NULL; |
| 656 | } |
| 657 | |
| 658 | return nbfd; |
| 659 | } |
| 660 | |
| 661 | static inline void |
| 662 | _maybe_make_executable (bfd * abfd) |
| 663 | { |
| 664 | /* If the file was open for writing and is now executable, |
| 665 | make it so. */ |
| 666 | if (abfd->direction == write_direction |
| 667 | && (abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
| 668 | { |
| 669 | struct stat buf; |
| 670 | |
| 671 | if (stat (abfd->filename, &buf) == 0 |
| 672 | /* Do not attempt to change non-regular files. This is |
| 673 | here especially for configure scripts and kernel builds |
| 674 | which run tests with "ld [...] -o /dev/null". */ |
| 675 | && S_ISREG(buf.st_mode)) |
| 676 | { |
| 677 | unsigned int mask = umask (0); |
| 678 | |
| 679 | umask (mask); |
| 680 | chmod (abfd->filename, |
| 681 | (0777 |
| 682 | & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask)))); |
| 683 | } |
| 684 | } |
| 685 | } |
| 686 | |
| 687 | /* |
| 688 | |
| 689 | FUNCTION |
| 690 | bfd_close |
| 691 | |
| 692 | SYNOPSIS |
| 693 | bfd_boolean bfd_close (bfd *abfd); |
| 694 | |
| 695 | DESCRIPTION |
| 696 | |
| 697 | Close a BFD. If the BFD was open for writing, then pending |
| 698 | operations are completed and the file written out and closed. |
| 699 | If the created file is executable, then <<chmod>> is called |
| 700 | to mark it as such. |
| 701 | |
| 702 | All memory attached to the BFD is released. |
| 703 | |
| 704 | The file descriptor associated with the BFD is closed (even |
| 705 | if it was passed in to BFD by <<bfd_fdopenr>>). |
| 706 | |
| 707 | RETURNS |
| 708 | <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. |
| 709 | */ |
| 710 | |
| 711 | |
| 712 | bfd_boolean |
| 713 | bfd_close (bfd *abfd) |
| 714 | { |
| 715 | bfd_boolean ret; |
| 716 | |
| 717 | if (bfd_write_p (abfd)) |
| 718 | { |
| 719 | if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd))) |
| 720 | return FALSE; |
| 721 | } |
| 722 | |
| 723 | if (! BFD_SEND (abfd, _close_and_cleanup, (abfd))) |
| 724 | return FALSE; |
| 725 | |
| 726 | ret = abfd->iovec->bclose (abfd); |
| 727 | |
| 728 | if (ret) |
| 729 | _maybe_make_executable (abfd); |
| 730 | |
| 731 | _bfd_delete_bfd (abfd); |
| 732 | |
| 733 | return ret; |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | FUNCTION |
| 738 | bfd_close_all_done |
| 739 | |
| 740 | SYNOPSIS |
| 741 | bfd_boolean bfd_close_all_done (bfd *); |
| 742 | |
| 743 | DESCRIPTION |
| 744 | Close a BFD. Differs from <<bfd_close>> since it does not |
| 745 | complete any pending operations. This routine would be used |
| 746 | if the application had just used BFD for swapping and didn't |
| 747 | want to use any of the writing code. |
| 748 | |
| 749 | If the created file is executable, then <<chmod>> is called |
| 750 | to mark it as such. |
| 751 | |
| 752 | All memory attached to the BFD is released. |
| 753 | |
| 754 | RETURNS |
| 755 | <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. |
| 756 | */ |
| 757 | |
| 758 | bfd_boolean |
| 759 | bfd_close_all_done (bfd *abfd) |
| 760 | { |
| 761 | bfd_boolean ret; |
| 762 | |
| 763 | ret = bfd_cache_close (abfd); |
| 764 | |
| 765 | if (ret) |
| 766 | _maybe_make_executable (abfd); |
| 767 | |
| 768 | _bfd_delete_bfd (abfd); |
| 769 | |
| 770 | return ret; |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | FUNCTION |
| 775 | bfd_create |
| 776 | |
| 777 | SYNOPSIS |
| 778 | bfd *bfd_create (const char *filename, bfd *templ); |
| 779 | |
| 780 | DESCRIPTION |
| 781 | Create a new BFD in the manner of <<bfd_openw>>, but without |
| 782 | opening a file. The new BFD takes the target from the target |
| 783 | used by @var{templ}. The format is always set to <<bfd_object>>. |
| 784 | */ |
| 785 | |
| 786 | bfd * |
| 787 | bfd_create (const char *filename, bfd *templ) |
| 788 | { |
| 789 | bfd *nbfd; |
| 790 | |
| 791 | nbfd = _bfd_new_bfd (); |
| 792 | if (nbfd == NULL) |
| 793 | return NULL; |
| 794 | nbfd->filename = filename; |
| 795 | if (templ) |
| 796 | nbfd->xvec = templ->xvec; |
| 797 | nbfd->direction = no_direction; |
| 798 | bfd_set_format (nbfd, bfd_object); |
| 799 | |
| 800 | return nbfd; |
| 801 | } |
| 802 | |
| 803 | /* |
| 804 | FUNCTION |
| 805 | bfd_make_writable |
| 806 | |
| 807 | SYNOPSIS |
| 808 | bfd_boolean bfd_make_writable (bfd *abfd); |
| 809 | |
| 810 | DESCRIPTION |
| 811 | Takes a BFD as created by <<bfd_create>> and converts it |
| 812 | into one like as returned by <<bfd_openw>>. It does this |
| 813 | by converting the BFD to BFD_IN_MEMORY. It's assumed that |
| 814 | you will call <<bfd_make_readable>> on this bfd later. |
| 815 | |
| 816 | RETURNS |
| 817 | <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. |
| 818 | */ |
| 819 | |
| 820 | bfd_boolean |
| 821 | bfd_make_writable (bfd *abfd) |
| 822 | { |
| 823 | struct bfd_in_memory *bim; |
| 824 | |
| 825 | if (abfd->direction != no_direction) |
| 826 | { |
| 827 | bfd_set_error (bfd_error_invalid_operation); |
| 828 | return FALSE; |
| 829 | } |
| 830 | |
| 831 | bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory)); |
| 832 | if (bim == NULL) |
| 833 | return FALSE; /* bfd_error already set. */ |
| 834 | abfd->iostream = bim; |
| 835 | /* bfd_bwrite will grow these as needed. */ |
| 836 | bim->size = 0; |
| 837 | bim->buffer = 0; |
| 838 | |
| 839 | abfd->flags |= BFD_IN_MEMORY; |
| 840 | abfd->iovec = &_bfd_memory_iovec; |
| 841 | abfd->origin = 0; |
| 842 | abfd->direction = write_direction; |
| 843 | abfd->where = 0; |
| 844 | |
| 845 | return TRUE; |
| 846 | } |
| 847 | |
| 848 | /* |
| 849 | FUNCTION |
| 850 | bfd_make_readable |
| 851 | |
| 852 | SYNOPSIS |
| 853 | bfd_boolean bfd_make_readable (bfd *abfd); |
| 854 | |
| 855 | DESCRIPTION |
| 856 | Takes a BFD as created by <<bfd_create>> and |
| 857 | <<bfd_make_writable>> and converts it into one like as |
| 858 | returned by <<bfd_openr>>. It does this by writing the |
| 859 | contents out to the memory buffer, then reversing the |
| 860 | direction. |
| 861 | |
| 862 | RETURNS |
| 863 | <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. */ |
| 864 | |
| 865 | bfd_boolean |
| 866 | bfd_make_readable (bfd *abfd) |
| 867 | { |
| 868 | if (abfd->direction != write_direction || !(abfd->flags & BFD_IN_MEMORY)) |
| 869 | { |
| 870 | bfd_set_error (bfd_error_invalid_operation); |
| 871 | return FALSE; |
| 872 | } |
| 873 | |
| 874 | if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd))) |
| 875 | return FALSE; |
| 876 | |
| 877 | if (! BFD_SEND (abfd, _close_and_cleanup, (abfd))) |
| 878 | return FALSE; |
| 879 | |
| 880 | abfd->arch_info = &bfd_default_arch_struct; |
| 881 | |
| 882 | abfd->where = 0; |
| 883 | abfd->format = bfd_unknown; |
| 884 | abfd->my_archive = NULL; |
| 885 | abfd->origin = 0; |
| 886 | abfd->opened_once = FALSE; |
| 887 | abfd->output_has_begun = FALSE; |
| 888 | abfd->section_count = 0; |
| 889 | abfd->usrdata = NULL; |
| 890 | abfd->cacheable = FALSE; |
| 891 | abfd->flags |= BFD_IN_MEMORY; |
| 892 | abfd->mtime_set = FALSE; |
| 893 | |
| 894 | abfd->target_defaulted = TRUE; |
| 895 | abfd->direction = read_direction; |
| 896 | abfd->sections = 0; |
| 897 | abfd->symcount = 0; |
| 898 | abfd->outsymbols = 0; |
| 899 | abfd->tdata.any = 0; |
| 900 | |
| 901 | bfd_section_list_clear (abfd); |
| 902 | bfd_check_format (abfd, bfd_object); |
| 903 | |
| 904 | return TRUE; |
| 905 | } |
| 906 | |
| 907 | /* |
| 908 | FUNCTION |
| 909 | bfd_alloc |
| 910 | |
| 911 | SYNOPSIS |
| 912 | void *bfd_alloc (bfd *abfd, bfd_size_type wanted); |
| 913 | |
| 914 | DESCRIPTION |
| 915 | Allocate a block of @var{wanted} bytes of memory attached to |
| 916 | <<abfd>> and return a pointer to it. |
| 917 | */ |
| 918 | |
| 919 | void * |
| 920 | bfd_alloc (bfd *abfd, bfd_size_type size) |
| 921 | { |
| 922 | void *ret; |
| 923 | |
| 924 | if (size != (unsigned long) size) |
| 925 | { |
| 926 | bfd_set_error (bfd_error_no_memory); |
| 927 | return NULL; |
| 928 | } |
| 929 | |
| 930 | ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size); |
| 931 | if (ret == NULL) |
| 932 | bfd_set_error (bfd_error_no_memory); |
| 933 | return ret; |
| 934 | } |
| 935 | |
| 936 | /* |
| 937 | INTERNAL_FUNCTION |
| 938 | bfd_alloc2 |
| 939 | |
| 940 | SYNOPSIS |
| 941 | void *bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size); |
| 942 | |
| 943 | DESCRIPTION |
| 944 | Allocate a block of @var{nmemb} elements of @var{size} bytes each |
| 945 | of memory attached to <<abfd>> and return a pointer to it. |
| 946 | */ |
| 947 | |
| 948 | void * |
| 949 | bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size) |
| 950 | { |
| 951 | void *ret; |
| 952 | |
| 953 | if ((nmemb | size) >= HALF_BFD_SIZE_TYPE |
| 954 | && size != 0 |
| 955 | && nmemb > ~(bfd_size_type) 0 / size) |
| 956 | { |
| 957 | bfd_set_error (bfd_error_no_memory); |
| 958 | return NULL; |
| 959 | } |
| 960 | |
| 961 | size *= nmemb; |
| 962 | |
| 963 | if (size != (unsigned long) size) |
| 964 | { |
| 965 | bfd_set_error (bfd_error_no_memory); |
| 966 | return NULL; |
| 967 | } |
| 968 | |
| 969 | ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size); |
| 970 | if (ret == NULL) |
| 971 | bfd_set_error (bfd_error_no_memory); |
| 972 | return ret; |
| 973 | } |
| 974 | |
| 975 | /* |
| 976 | FUNCTION |
| 977 | bfd_zalloc |
| 978 | |
| 979 | SYNOPSIS |
| 980 | void *bfd_zalloc (bfd *abfd, bfd_size_type wanted); |
| 981 | |
| 982 | DESCRIPTION |
| 983 | Allocate a block of @var{wanted} bytes of zeroed memory |
| 984 | attached to <<abfd>> and return a pointer to it. |
| 985 | */ |
| 986 | |
| 987 | void * |
| 988 | bfd_zalloc (bfd *abfd, bfd_size_type size) |
| 989 | { |
| 990 | void *res; |
| 991 | |
| 992 | res = bfd_alloc (abfd, size); |
| 993 | if (res) |
| 994 | memset (res, 0, (size_t) size); |
| 995 | return res; |
| 996 | } |
| 997 | |
| 998 | /* |
| 999 | INTERNAL_FUNCTION |
| 1000 | bfd_zalloc2 |
| 1001 | |
| 1002 | SYNOPSIS |
| 1003 | void *bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size); |
| 1004 | |
| 1005 | DESCRIPTION |
| 1006 | Allocate a block of @var{nmemb} elements of @var{size} bytes each |
| 1007 | of zeroed memory attached to <<abfd>> and return a pointer to it. |
| 1008 | */ |
| 1009 | |
| 1010 | void * |
| 1011 | bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size) |
| 1012 | { |
| 1013 | void *res; |
| 1014 | |
| 1015 | if ((nmemb | size) >= HALF_BFD_SIZE_TYPE |
| 1016 | && size != 0 |
| 1017 | && nmemb > ~(bfd_size_type) 0 / size) |
| 1018 | { |
| 1019 | bfd_set_error (bfd_error_no_memory); |
| 1020 | return NULL; |
| 1021 | } |
| 1022 | |
| 1023 | size *= nmemb; |
| 1024 | |
| 1025 | res = bfd_alloc (abfd, size); |
| 1026 | if (res) |
| 1027 | memset (res, 0, (size_t) size); |
| 1028 | return res; |
| 1029 | } |
| 1030 | |
| 1031 | /* Free a block allocated for a BFD. |
| 1032 | Note: Also frees all more recently allocated blocks! */ |
| 1033 | |
| 1034 | void |
| 1035 | bfd_release (bfd *abfd, void *block) |
| 1036 | { |
| 1037 | objalloc_free_block ((struct objalloc *) abfd->memory, block); |
| 1038 | } |
| 1039 | |
| 1040 | |
| 1041 | /* |
| 1042 | GNU Extension: separate debug-info files |
| 1043 | |
| 1044 | The idea here is that a special section called .gnu_debuglink might be |
| 1045 | embedded in a binary file, which indicates that some *other* file |
| 1046 | contains the real debugging information. This special section contains a |
| 1047 | filename and CRC32 checksum, which we read and resolve to another file, |
| 1048 | if it exists. |
| 1049 | |
| 1050 | This facilitates "optional" provision of debugging information, without |
| 1051 | having to provide two complete copies of every binary object (with and |
| 1052 | without debug symbols). |
| 1053 | */ |
| 1054 | |
| 1055 | #define GNU_DEBUGLINK ".gnu_debuglink" |
| 1056 | /* |
| 1057 | FUNCTION |
| 1058 | bfd_calc_gnu_debuglink_crc32 |
| 1059 | |
| 1060 | SYNOPSIS |
| 1061 | unsigned long bfd_calc_gnu_debuglink_crc32 |
| 1062 | (unsigned long crc, const unsigned char *buf, bfd_size_type len); |
| 1063 | |
| 1064 | DESCRIPTION |
| 1065 | Computes a CRC value as used in the .gnu_debuglink section. |
| 1066 | Advances the previously computed @var{crc} value by computing |
| 1067 | and adding in the crc32 for @var{len} bytes of @var{buf}. |
| 1068 | |
| 1069 | RETURNS |
| 1070 | Return the updated CRC32 value. |
| 1071 | */ |
| 1072 | |
| 1073 | unsigned long |
| 1074 | bfd_calc_gnu_debuglink_crc32 (unsigned long crc, |
| 1075 | const unsigned char *buf, |
| 1076 | bfd_size_type len) |
| 1077 | { |
| 1078 | static const unsigned long crc32_table[256] = |
| 1079 | { |
| 1080 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, |
| 1081 | 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, |
| 1082 | 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, |
| 1083 | 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, |
| 1084 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, |
| 1085 | 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, |
| 1086 | 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, |
| 1087 | 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, |
| 1088 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, |
| 1089 | 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, |
| 1090 | 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, |
| 1091 | 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, |
| 1092 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, |
| 1093 | 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, |
| 1094 | 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, |
| 1095 | 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, |
| 1096 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, |
| 1097 | 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, |
| 1098 | 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, |
| 1099 | 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, |
| 1100 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, |
| 1101 | 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, |
| 1102 | 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, |
| 1103 | 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, |
| 1104 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, |
| 1105 | 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, |
| 1106 | 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, |
| 1107 | 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, |
| 1108 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, |
| 1109 | 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, |
| 1110 | 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, |
| 1111 | 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, |
| 1112 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, |
| 1113 | 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, |
| 1114 | 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, |
| 1115 | 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, |
| 1116 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, |
| 1117 | 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, |
| 1118 | 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, |
| 1119 | 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, |
| 1120 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, |
| 1121 | 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, |
| 1122 | 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, |
| 1123 | 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, |
| 1124 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, |
| 1125 | 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, |
| 1126 | 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, |
| 1127 | 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, |
| 1128 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, |
| 1129 | 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, |
| 1130 | 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, |
| 1131 | 0x2d02ef8d |
| 1132 | }; |
| 1133 | const unsigned char *end; |
| 1134 | |
| 1135 | crc = ~crc & 0xffffffff; |
| 1136 | for (end = buf + len; buf < end; ++ buf) |
| 1137 | crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8); |
| 1138 | return ~crc & 0xffffffff; |
| 1139 | } |
| 1140 | |
| 1141 | |
| 1142 | /* |
| 1143 | INTERNAL_FUNCTION |
| 1144 | get_debug_link_info |
| 1145 | |
| 1146 | SYNOPSIS |
| 1147 | char *get_debug_link_info (bfd *abfd, unsigned long *crc32_out); |
| 1148 | |
| 1149 | DESCRIPTION |
| 1150 | fetch the filename and CRC32 value for any separate debuginfo |
| 1151 | associated with @var{abfd}. Return NULL if no such info found, |
| 1152 | otherwise return filename and update @var{crc32_out}. |
| 1153 | */ |
| 1154 | |
| 1155 | static char * |
| 1156 | get_debug_link_info (bfd *abfd, unsigned long *crc32_out) |
| 1157 | { |
| 1158 | asection *sect; |
| 1159 | unsigned long crc32; |
| 1160 | bfd_byte *contents; |
| 1161 | int crc_offset; |
| 1162 | char *name; |
| 1163 | |
| 1164 | BFD_ASSERT (abfd); |
| 1165 | BFD_ASSERT (crc32_out); |
| 1166 | |
| 1167 | sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK); |
| 1168 | |
| 1169 | if (sect == NULL) |
| 1170 | return NULL; |
| 1171 | |
| 1172 | if (!bfd_malloc_and_get_section (abfd, sect, &contents)) |
| 1173 | { |
| 1174 | if (contents != NULL) |
| 1175 | free (contents); |
| 1176 | return NULL; |
| 1177 | } |
| 1178 | |
| 1179 | /* Crc value is stored after the filename, aligned up to 4 bytes. */ |
| 1180 | name = (char *) contents; |
| 1181 | crc_offset = strlen (name) + 1; |
| 1182 | crc_offset = (crc_offset + 3) & ~3; |
| 1183 | |
| 1184 | crc32 = bfd_get_32 (abfd, contents + crc_offset); |
| 1185 | |
| 1186 | *crc32_out = crc32; |
| 1187 | return name; |
| 1188 | } |
| 1189 | |
| 1190 | /* |
| 1191 | INTERNAL_FUNCTION |
| 1192 | separate_debug_file_exists |
| 1193 | |
| 1194 | SYNOPSIS |
| 1195 | bfd_boolean separate_debug_file_exists |
| 1196 | (char *name, unsigned long crc32); |
| 1197 | |
| 1198 | DESCRIPTION |
| 1199 | Checks to see if @var{name} is a file and if its contents |
| 1200 | match @var{crc32}. |
| 1201 | */ |
| 1202 | |
| 1203 | static bfd_boolean |
| 1204 | separate_debug_file_exists (const char *name, const unsigned long crc) |
| 1205 | { |
| 1206 | static unsigned char buffer [8 * 1024]; |
| 1207 | unsigned long file_crc = 0; |
| 1208 | FILE *f; |
| 1209 | bfd_size_type count; |
| 1210 | |
| 1211 | BFD_ASSERT (name); |
| 1212 | |
| 1213 | f = real_fopen (name, FOPEN_RB); |
| 1214 | if (f == NULL) |
| 1215 | return FALSE; |
| 1216 | |
| 1217 | while ((count = fread (buffer, 1, sizeof (buffer), f)) > 0) |
| 1218 | file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count); |
| 1219 | |
| 1220 | fclose (f); |
| 1221 | |
| 1222 | return crc == file_crc; |
| 1223 | } |
| 1224 | |
| 1225 | |
| 1226 | /* |
| 1227 | INTERNAL_FUNCTION |
| 1228 | find_separate_debug_file |
| 1229 | |
| 1230 | SYNOPSIS |
| 1231 | char *find_separate_debug_file (bfd *abfd); |
| 1232 | |
| 1233 | DESCRIPTION |
| 1234 | Searches @var{abfd} for a reference to separate debugging |
| 1235 | information, scans various locations in the filesystem, including |
| 1236 | the file tree rooted at @var{debug_file_directory}, and returns a |
| 1237 | filename of such debugging information if the file is found and has |
| 1238 | matching CRC32. Returns NULL if no reference to debugging file |
| 1239 | exists, or file cannot be found. |
| 1240 | */ |
| 1241 | |
| 1242 | static char * |
| 1243 | find_separate_debug_file (bfd *abfd, const char *debug_file_directory) |
| 1244 | { |
| 1245 | char *base; |
| 1246 | char *dir; |
| 1247 | char *debugfile; |
| 1248 | char *canon_dir; |
| 1249 | unsigned long crc32; |
| 1250 | size_t dirlen; |
| 1251 | size_t canon_dirlen; |
| 1252 | |
| 1253 | BFD_ASSERT (abfd); |
| 1254 | if (debug_file_directory == NULL) |
| 1255 | debug_file_directory = "."; |
| 1256 | |
| 1257 | /* BFD may have been opened from a stream. */ |
| 1258 | if (abfd->filename == NULL) |
| 1259 | { |
| 1260 | bfd_set_error (bfd_error_invalid_operation); |
| 1261 | return NULL; |
| 1262 | } |
| 1263 | |
| 1264 | base = get_debug_link_info (abfd, & crc32); |
| 1265 | if (base == NULL) |
| 1266 | return NULL; |
| 1267 | |
| 1268 | if (base[0] == '\0') |
| 1269 | { |
| 1270 | free (base); |
| 1271 | bfd_set_error (bfd_error_no_debug_section); |
| 1272 | return NULL; |
| 1273 | } |
| 1274 | |
| 1275 | for (dirlen = strlen (abfd->filename); dirlen > 0; dirlen--) |
| 1276 | if (IS_DIR_SEPARATOR (abfd->filename[dirlen - 1])) |
| 1277 | break; |
| 1278 | |
| 1279 | dir = (char *) bfd_malloc (dirlen + 1); |
| 1280 | if (dir == NULL) |
| 1281 | { |
| 1282 | free (base); |
| 1283 | return NULL; |
| 1284 | } |
| 1285 | memcpy (dir, abfd->filename, dirlen); |
| 1286 | dir[dirlen] = '\0'; |
| 1287 | |
| 1288 | /* Compute the canonical name of the bfd object with all symbolic links |
| 1289 | resolved, for use in the global debugfile directory. */ |
| 1290 | canon_dir = lrealpath (abfd->filename); |
| 1291 | for (canon_dirlen = strlen (canon_dir); canon_dirlen > 0; canon_dirlen--) |
| 1292 | if (IS_DIR_SEPARATOR (canon_dir[canon_dirlen - 1])) |
| 1293 | break; |
| 1294 | canon_dir[canon_dirlen] = '\0'; |
| 1295 | |
| 1296 | debugfile = (char *) |
| 1297 | bfd_malloc (strlen (debug_file_directory) + 1 |
| 1298 | + (canon_dirlen > dirlen ? canon_dirlen : dirlen) |
| 1299 | + strlen (".debug/") |
| 1300 | + strlen (base) |
| 1301 | + 1); |
| 1302 | if (debugfile == NULL) |
| 1303 | { |
| 1304 | free (base); |
| 1305 | free (dir); |
| 1306 | free (canon_dir); |
| 1307 | return NULL; |
| 1308 | } |
| 1309 | |
| 1310 | /* First try in the same directory as the original file: */ |
| 1311 | strcpy (debugfile, dir); |
| 1312 | strcat (debugfile, base); |
| 1313 | |
| 1314 | if (separate_debug_file_exists (debugfile, crc32)) |
| 1315 | { |
| 1316 | free (base); |
| 1317 | free (dir); |
| 1318 | free (canon_dir); |
| 1319 | return debugfile; |
| 1320 | } |
| 1321 | |
| 1322 | /* Then try in a subdirectory called .debug. */ |
| 1323 | strcpy (debugfile, dir); |
| 1324 | strcat (debugfile, ".debug/"); |
| 1325 | strcat (debugfile, base); |
| 1326 | |
| 1327 | if (separate_debug_file_exists (debugfile, crc32)) |
| 1328 | { |
| 1329 | free (base); |
| 1330 | free (dir); |
| 1331 | free (canon_dir); |
| 1332 | return debugfile; |
| 1333 | } |
| 1334 | |
| 1335 | /* Then try in the global debugfile directory. */ |
| 1336 | strcpy (debugfile, debug_file_directory); |
| 1337 | dirlen = strlen (debug_file_directory) - 1; |
| 1338 | if (dirlen > 0 |
| 1339 | && debug_file_directory[dirlen] != '/' |
| 1340 | && canon_dir[0] != '/') |
| 1341 | strcat (debugfile, "/"); |
| 1342 | strcat (debugfile, canon_dir); |
| 1343 | strcat (debugfile, base); |
| 1344 | |
| 1345 | if (separate_debug_file_exists (debugfile, crc32)) |
| 1346 | { |
| 1347 | free (base); |
| 1348 | free (dir); |
| 1349 | free (canon_dir); |
| 1350 | return debugfile; |
| 1351 | } |
| 1352 | |
| 1353 | free (debugfile); |
| 1354 | free (base); |
| 1355 | free (dir); |
| 1356 | free (canon_dir); |
| 1357 | return NULL; |
| 1358 | } |
| 1359 | |
| 1360 | |
| 1361 | /* |
| 1362 | FUNCTION |
| 1363 | bfd_follow_gnu_debuglink |
| 1364 | |
| 1365 | SYNOPSIS |
| 1366 | char *bfd_follow_gnu_debuglink (bfd *abfd, const char *dir); |
| 1367 | |
| 1368 | DESCRIPTION |
| 1369 | |
| 1370 | Takes a BFD and searches it for a .gnu_debuglink section. If this |
| 1371 | section is found, it examines the section for the name and checksum |
| 1372 | of a '.debug' file containing auxiliary debugging information. It |
| 1373 | then searches the filesystem for this .debug file in some standard |
| 1374 | locations, including the directory tree rooted at @var{dir}, and if |
| 1375 | found returns the full filename. |
| 1376 | |
| 1377 | If @var{dir} is NULL, it will search a default path configured into |
| 1378 | libbfd at build time. [XXX this feature is not currently |
| 1379 | implemented]. |
| 1380 | |
| 1381 | RETURNS |
| 1382 | <<NULL>> on any errors or failure to locate the .debug file, |
| 1383 | otherwise a pointer to a heap-allocated string containing the |
| 1384 | filename. The caller is responsible for freeing this string. |
| 1385 | */ |
| 1386 | |
| 1387 | char * |
| 1388 | bfd_follow_gnu_debuglink (bfd *abfd, const char *dir) |
| 1389 | { |
| 1390 | return find_separate_debug_file (abfd, dir); |
| 1391 | } |
| 1392 | |
| 1393 | /* |
| 1394 | FUNCTION |
| 1395 | bfd_create_gnu_debuglink_section |
| 1396 | |
| 1397 | SYNOPSIS |
| 1398 | struct bfd_section *bfd_create_gnu_debuglink_section |
| 1399 | (bfd *abfd, const char *filename); |
| 1400 | |
| 1401 | DESCRIPTION |
| 1402 | |
| 1403 | Takes a @var{BFD} and adds a .gnu_debuglink section to it. The section is sized |
| 1404 | to be big enough to contain a link to the specified @var{filename}. |
| 1405 | |
| 1406 | RETURNS |
| 1407 | A pointer to the new section is returned if all is ok. Otherwise <<NULL>> is |
| 1408 | returned and bfd_error is set. |
| 1409 | */ |
| 1410 | |
| 1411 | asection * |
| 1412 | bfd_create_gnu_debuglink_section (bfd *abfd, const char *filename) |
| 1413 | { |
| 1414 | asection *sect; |
| 1415 | bfd_size_type debuglink_size; |
| 1416 | flagword flags; |
| 1417 | |
| 1418 | if (abfd == NULL || filename == NULL) |
| 1419 | { |
| 1420 | bfd_set_error (bfd_error_invalid_operation); |
| 1421 | return NULL; |
| 1422 | } |
| 1423 | |
| 1424 | /* Strip off any path components in filename. */ |
| 1425 | filename = lbasename (filename); |
| 1426 | |
| 1427 | sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK); |
| 1428 | if (sect) |
| 1429 | { |
| 1430 | /* Section already exists. */ |
| 1431 | bfd_set_error (bfd_error_invalid_operation); |
| 1432 | return NULL; |
| 1433 | } |
| 1434 | |
| 1435 | flags = SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING; |
| 1436 | sect = bfd_make_section_with_flags (abfd, GNU_DEBUGLINK, flags); |
| 1437 | if (sect == NULL) |
| 1438 | return NULL; |
| 1439 | |
| 1440 | debuglink_size = strlen (filename) + 1; |
| 1441 | debuglink_size += 3; |
| 1442 | debuglink_size &= ~3; |
| 1443 | debuglink_size += 4; |
| 1444 | |
| 1445 | if (! bfd_set_section_size (abfd, sect, debuglink_size)) |
| 1446 | /* XXX Should we delete the section from the bfd ? */ |
| 1447 | return NULL; |
| 1448 | |
| 1449 | return sect; |
| 1450 | } |
| 1451 | |
| 1452 | |
| 1453 | /* |
| 1454 | FUNCTION |
| 1455 | bfd_fill_in_gnu_debuglink_section |
| 1456 | |
| 1457 | SYNOPSIS |
| 1458 | bfd_boolean bfd_fill_in_gnu_debuglink_section |
| 1459 | (bfd *abfd, struct bfd_section *sect, const char *filename); |
| 1460 | |
| 1461 | DESCRIPTION |
| 1462 | |
| 1463 | Takes a @var{BFD} and containing a .gnu_debuglink section @var{SECT} |
| 1464 | and fills in the contents of the section to contain a link to the |
| 1465 | specified @var{filename}. The filename should be relative to the |
| 1466 | current directory. |
| 1467 | |
| 1468 | RETURNS |
| 1469 | <<TRUE>> is returned if all is ok. Otherwise <<FALSE>> is returned |
| 1470 | and bfd_error is set. |
| 1471 | */ |
| 1472 | |
| 1473 | bfd_boolean |
| 1474 | bfd_fill_in_gnu_debuglink_section (bfd *abfd, |
| 1475 | struct bfd_section *sect, |
| 1476 | const char *filename) |
| 1477 | { |
| 1478 | bfd_size_type debuglink_size; |
| 1479 | unsigned long crc32; |
| 1480 | char * contents; |
| 1481 | bfd_size_type crc_offset; |
| 1482 | FILE * handle; |
| 1483 | static unsigned char buffer[8 * 1024]; |
| 1484 | size_t count; |
| 1485 | size_t filelen; |
| 1486 | |
| 1487 | if (abfd == NULL || sect == NULL || filename == NULL) |
| 1488 | { |
| 1489 | bfd_set_error (bfd_error_invalid_operation); |
| 1490 | return FALSE; |
| 1491 | } |
| 1492 | |
| 1493 | /* Make sure that we can read the file. |
| 1494 | XXX - Should we attempt to locate the debug info file using the same |
| 1495 | algorithm as gdb ? At the moment, since we are creating the |
| 1496 | .gnu_debuglink section, we insist upon the user providing us with a |
| 1497 | correct-for-section-creation-time path, but this need not conform to |
| 1498 | the gdb location algorithm. */ |
| 1499 | handle = real_fopen (filename, FOPEN_RB); |
| 1500 | if (handle == NULL) |
| 1501 | { |
| 1502 | bfd_set_error (bfd_error_system_call); |
| 1503 | return FALSE; |
| 1504 | } |
| 1505 | |
| 1506 | crc32 = 0; |
| 1507 | while ((count = fread (buffer, 1, sizeof buffer, handle)) > 0) |
| 1508 | crc32 = bfd_calc_gnu_debuglink_crc32 (crc32, buffer, count); |
| 1509 | fclose (handle); |
| 1510 | |
| 1511 | /* Strip off any path components in filename, |
| 1512 | now that we no longer need them. */ |
| 1513 | filename = lbasename (filename); |
| 1514 | |
| 1515 | filelen = strlen (filename); |
| 1516 | debuglink_size = filelen + 1; |
| 1517 | debuglink_size += 3; |
| 1518 | debuglink_size &= ~3; |
| 1519 | debuglink_size += 4; |
| 1520 | |
| 1521 | contents = (char *) bfd_malloc (debuglink_size); |
| 1522 | if (contents == NULL) |
| 1523 | { |
| 1524 | /* XXX Should we delete the section from the bfd ? */ |
| 1525 | return FALSE; |
| 1526 | } |
| 1527 | |
| 1528 | crc_offset = debuglink_size - 4; |
| 1529 | memcpy (contents, filename, filelen); |
| 1530 | memset (contents + filelen, 0, crc_offset - filelen); |
| 1531 | |
| 1532 | bfd_put_32 (abfd, crc32, contents + crc_offset); |
| 1533 | |
| 1534 | if (! bfd_set_section_contents (abfd, sect, contents, 0, debuglink_size)) |
| 1535 | { |
| 1536 | /* XXX Should we delete the section from the bfd ? */ |
| 1537 | free (contents); |
| 1538 | return FALSE; |
| 1539 | } |
| 1540 | |
| 1541 | return TRUE; |
| 1542 | } |