| 1 | /* Linker file opening and searching. |
| 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002, |
| 3 | 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the GNU Binutils. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "safe-ctype.h" |
| 26 | #include "ld.h" |
| 27 | #include "ldmisc.h" |
| 28 | #include "ldexp.h" |
| 29 | #include "ldlang.h" |
| 30 | #include "ldfile.h" |
| 31 | #include "ldmain.h" |
| 32 | #include <ldgram.h> |
| 33 | #include "ldlex.h" |
| 34 | #include "ldemul.h" |
| 35 | #include "libiberty.h" |
| 36 | #include "filenames.h" |
| 37 | |
| 38 | const char * ldfile_input_filename; |
| 39 | bfd_boolean ldfile_assumed_script = FALSE; |
| 40 | const char * ldfile_output_machine_name = ""; |
| 41 | unsigned long ldfile_output_machine; |
| 42 | enum bfd_architecture ldfile_output_architecture; |
| 43 | search_dirs_type * search_head; |
| 44 | |
| 45 | #ifdef VMS |
| 46 | static char * slash = ""; |
| 47 | #else |
| 48 | #if defined (_WIN32) && ! defined (__CYGWIN32__) |
| 49 | static char * slash = "\\"; |
| 50 | #else |
| 51 | static char * slash = "/"; |
| 52 | #endif |
| 53 | #endif |
| 54 | |
| 55 | typedef struct search_arch |
| 56 | { |
| 57 | char *name; |
| 58 | struct search_arch *next; |
| 59 | } search_arch_type; |
| 60 | |
| 61 | static search_dirs_type **search_tail_ptr = &search_head; |
| 62 | static search_arch_type *search_arch_head; |
| 63 | static search_arch_type **search_arch_tail_ptr = &search_arch_head; |
| 64 | |
| 65 | /* Test whether a pathname, after canonicalization, is the same or a |
| 66 | sub-directory of the sysroot directory. */ |
| 67 | |
| 68 | static bfd_boolean |
| 69 | is_sysrooted_pathname (const char *name, bfd_boolean notsame) |
| 70 | { |
| 71 | char * realname = ld_canon_sysroot ? lrealpath (name) : NULL; |
| 72 | int len; |
| 73 | bfd_boolean result; |
| 74 | |
| 75 | if (! realname) |
| 76 | return FALSE; |
| 77 | |
| 78 | len = strlen (realname); |
| 79 | |
| 80 | if (((! notsame && len == ld_canon_sysroot_len) |
| 81 | || (len >= ld_canon_sysroot_len |
| 82 | && IS_DIR_SEPARATOR (realname[ld_canon_sysroot_len]) |
| 83 | && (realname[ld_canon_sysroot_len] = '\0') == '\0')) |
| 84 | && FILENAME_CMP (ld_canon_sysroot, realname) == 0) |
| 85 | result = TRUE; |
| 86 | else |
| 87 | result = FALSE; |
| 88 | |
| 89 | if (realname) |
| 90 | free (realname); |
| 91 | |
| 92 | return result; |
| 93 | } |
| 94 | |
| 95 | /* Adds NAME to the library search path. |
| 96 | Makes a copy of NAME using xmalloc(). */ |
| 97 | |
| 98 | void |
| 99 | ldfile_add_library_path (const char *name, bfd_boolean cmdline) |
| 100 | { |
| 101 | search_dirs_type *new; |
| 102 | |
| 103 | if (!cmdline && config.only_cmd_line_lib_dirs) |
| 104 | return; |
| 105 | |
| 106 | new = xmalloc (sizeof (search_dirs_type)); |
| 107 | new->next = NULL; |
| 108 | new->cmdline = cmdline; |
| 109 | *search_tail_ptr = new; |
| 110 | search_tail_ptr = &new->next; |
| 111 | |
| 112 | /* If a directory is marked as honoring sysroot, prepend the sysroot path |
| 113 | now. */ |
| 114 | if (name[0] == '=') |
| 115 | { |
| 116 | new->name = concat (ld_sysroot, name + 1, (const char *) NULL); |
| 117 | new->sysrooted = TRUE; |
| 118 | } |
| 119 | else |
| 120 | { |
| 121 | new->name = xstrdup (name); |
| 122 | new->sysrooted = is_sysrooted_pathname (name, FALSE); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /* Try to open a BFD for a lang_input_statement. */ |
| 127 | |
| 128 | bfd_boolean |
| 129 | ldfile_try_open_bfd (const char *attempt, |
| 130 | lang_input_statement_type *entry) |
| 131 | { |
| 132 | entry->the_bfd = bfd_openr (attempt, entry->target); |
| 133 | |
| 134 | if (trace_file_tries) |
| 135 | { |
| 136 | if (entry->the_bfd == NULL) |
| 137 | info_msg (_("attempt to open %s failed\n"), attempt); |
| 138 | else |
| 139 | info_msg (_("attempt to open %s succeeded\n"), attempt); |
| 140 | } |
| 141 | |
| 142 | if (entry->the_bfd == NULL) |
| 143 | { |
| 144 | if (bfd_get_error () == bfd_error_invalid_target) |
| 145 | einfo (_("%F%P: invalid BFD target `%s'\n"), entry->target); |
| 146 | return FALSE; |
| 147 | } |
| 148 | |
| 149 | /* If we are searching for this file, see if the architecture is |
| 150 | compatible with the output file. If it isn't, keep searching. |
| 151 | If we can't open the file as an object file, stop the search |
| 152 | here. If we are statically linking, ensure that we don't link |
| 153 | a dynamic object. */ |
| 154 | |
| 155 | if (entry->search_dirs_flag || !entry->dynamic) |
| 156 | { |
| 157 | bfd *check; |
| 158 | |
| 159 | if (bfd_check_format (entry->the_bfd, bfd_archive)) |
| 160 | check = bfd_openr_next_archived_file (entry->the_bfd, NULL); |
| 161 | else |
| 162 | check = entry->the_bfd; |
| 163 | |
| 164 | if (check != NULL) |
| 165 | { |
| 166 | if (! bfd_check_format (check, bfd_object)) |
| 167 | { |
| 168 | if (check == entry->the_bfd |
| 169 | && entry->search_dirs_flag |
| 170 | && bfd_get_error () == bfd_error_file_not_recognized |
| 171 | && ! ldemul_unrecognized_file (entry)) |
| 172 | { |
| 173 | int token, skip = 0; |
| 174 | char *arg, *arg1, *arg2, *arg3; |
| 175 | extern FILE *yyin; |
| 176 | |
| 177 | /* Try to interpret the file as a linker script. */ |
| 178 | ldfile_open_command_file (attempt); |
| 179 | |
| 180 | ldfile_assumed_script = TRUE; |
| 181 | parser_input = input_selected; |
| 182 | ldlex_both (); |
| 183 | token = INPUT_SCRIPT; |
| 184 | while (token != 0) |
| 185 | { |
| 186 | switch (token) |
| 187 | { |
| 188 | case OUTPUT_FORMAT: |
| 189 | if ((token = yylex ()) != '(') |
| 190 | continue; |
| 191 | if ((token = yylex ()) != NAME) |
| 192 | continue; |
| 193 | arg1 = yylval.name; |
| 194 | arg2 = NULL; |
| 195 | arg3 = NULL; |
| 196 | token = yylex (); |
| 197 | if (token == ',') |
| 198 | { |
| 199 | if ((token = yylex ()) != NAME) |
| 200 | { |
| 201 | free (arg1); |
| 202 | continue; |
| 203 | } |
| 204 | arg2 = yylval.name; |
| 205 | if ((token = yylex ()) != ',' |
| 206 | || (token = yylex ()) != NAME) |
| 207 | { |
| 208 | free (arg1); |
| 209 | free (arg2); |
| 210 | continue; |
| 211 | } |
| 212 | arg3 = yylval.name; |
| 213 | token = yylex (); |
| 214 | } |
| 215 | if (token == ')') |
| 216 | { |
| 217 | switch (command_line.endian) |
| 218 | { |
| 219 | default: |
| 220 | case ENDIAN_UNSET: |
| 221 | arg = arg1; break; |
| 222 | case ENDIAN_BIG: |
| 223 | arg = arg2 ? arg2 : arg1; break; |
| 224 | case ENDIAN_LITTLE: |
| 225 | arg = arg3 ? arg3 : arg1; break; |
| 226 | } |
| 227 | if (strcmp (arg, lang_get_output_target ()) != 0) |
| 228 | skip = 1; |
| 229 | } |
| 230 | free (arg1); |
| 231 | if (arg2) free (arg2); |
| 232 | if (arg3) free (arg3); |
| 233 | break; |
| 234 | case NAME: |
| 235 | case LNAME: |
| 236 | case VERS_IDENTIFIER: |
| 237 | case VERS_TAG: |
| 238 | free (yylval.name); |
| 239 | break; |
| 240 | case INT: |
| 241 | if (yylval.bigint.str) |
| 242 | free (yylval.bigint.str); |
| 243 | break; |
| 244 | } |
| 245 | token = yylex (); |
| 246 | } |
| 247 | ldlex_popstate (); |
| 248 | ldfile_assumed_script = FALSE; |
| 249 | fclose (yyin); |
| 250 | yyin = NULL; |
| 251 | if (skip) |
| 252 | { |
| 253 | if (command_line.warn_search_mismatch) |
| 254 | einfo (_("%P: skipping incompatible %s " |
| 255 | "when searching for %s\n"), |
| 256 | attempt, entry->local_sym_name); |
| 257 | bfd_close (entry->the_bfd); |
| 258 | entry->the_bfd = NULL; |
| 259 | return FALSE; |
| 260 | } |
| 261 | } |
| 262 | return TRUE; |
| 263 | } |
| 264 | |
| 265 | if (!entry->dynamic && (entry->the_bfd->flags & DYNAMIC) != 0) |
| 266 | { |
| 267 | einfo (_("%F%P: attempted static link of dynamic object `%s'\n"), |
| 268 | attempt); |
| 269 | bfd_close (entry->the_bfd); |
| 270 | entry->the_bfd = NULL; |
| 271 | return FALSE; |
| 272 | } |
| 273 | |
| 274 | if (entry->search_dirs_flag |
| 275 | && !bfd_arch_get_compatible (check, link_info.output_bfd, |
| 276 | command_line.accept_unknown_input_arch) |
| 277 | /* XCOFF archives can have 32 and 64 bit objects. */ |
| 278 | && ! (bfd_get_flavour (check) == bfd_target_xcoff_flavour |
| 279 | && bfd_get_flavour (link_info.output_bfd) == bfd_target_xcoff_flavour |
| 280 | && bfd_check_format (entry->the_bfd, bfd_archive))) |
| 281 | { |
| 282 | if (command_line.warn_search_mismatch) |
| 283 | einfo (_("%P: skipping incompatible %s " |
| 284 | "when searching for %s\n"), |
| 285 | attempt, entry->local_sym_name); |
| 286 | bfd_close (entry->the_bfd); |
| 287 | entry->the_bfd = NULL; |
| 288 | return FALSE; |
| 289 | } |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | return TRUE; |
| 294 | } |
| 295 | |
| 296 | /* Search for and open the file specified by ENTRY. If it is an |
| 297 | archive, use ARCH, LIB and SUFFIX to modify the file name. */ |
| 298 | |
| 299 | bfd_boolean |
| 300 | ldfile_open_file_search (const char *arch, |
| 301 | lang_input_statement_type *entry, |
| 302 | const char *lib, |
| 303 | const char *suffix) |
| 304 | { |
| 305 | search_dirs_type *search; |
| 306 | |
| 307 | /* If this is not an archive, try to open it in the current |
| 308 | directory first. */ |
| 309 | if (! entry->is_archive) |
| 310 | { |
| 311 | if (entry->sysrooted && IS_ABSOLUTE_PATH (entry->filename)) |
| 312 | { |
| 313 | char *name = concat (ld_sysroot, entry->filename, |
| 314 | (const char *) NULL); |
| 315 | if (ldfile_try_open_bfd (name, entry)) |
| 316 | { |
| 317 | entry->filename = name; |
| 318 | return TRUE; |
| 319 | } |
| 320 | free (name); |
| 321 | } |
| 322 | else if (ldfile_try_open_bfd (entry->filename, entry)) |
| 323 | { |
| 324 | entry->sysrooted = IS_ABSOLUTE_PATH (entry->filename) |
| 325 | && is_sysrooted_pathname (entry->filename, TRUE); |
| 326 | return TRUE; |
| 327 | } |
| 328 | |
| 329 | if (IS_ABSOLUTE_PATH (entry->filename)) |
| 330 | return FALSE; |
| 331 | } |
| 332 | |
| 333 | for (search = search_head; search != NULL; search = search->next) |
| 334 | { |
| 335 | char *string; |
| 336 | |
| 337 | if (entry->dynamic && ! link_info.relocatable) |
| 338 | { |
| 339 | if (ldemul_open_dynamic_archive (arch, search, entry)) |
| 340 | { |
| 341 | entry->sysrooted = search->sysrooted; |
| 342 | return TRUE; |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | string = xmalloc (strlen (search->name) |
| 347 | + strlen (slash) |
| 348 | + strlen (lib) |
| 349 | + strlen (entry->filename) |
| 350 | + strlen (arch) |
| 351 | + strlen (suffix) |
| 352 | + 1); |
| 353 | |
| 354 | if (entry->is_archive) |
| 355 | sprintf (string, "%s%s%s%s%s%s", search->name, slash, |
| 356 | lib, entry->filename, arch, suffix); |
| 357 | else |
| 358 | sprintf (string, "%s%s%s", search->name, slash, entry->filename); |
| 359 | |
| 360 | if (ldfile_try_open_bfd (string, entry)) |
| 361 | { |
| 362 | entry->filename = string; |
| 363 | entry->sysrooted = search->sysrooted; |
| 364 | return TRUE; |
| 365 | } |
| 366 | |
| 367 | free (string); |
| 368 | } |
| 369 | |
| 370 | return FALSE; |
| 371 | } |
| 372 | |
| 373 | /* Open the input file specified by ENTRY. */ |
| 374 | |
| 375 | void |
| 376 | ldfile_open_file (lang_input_statement_type *entry) |
| 377 | { |
| 378 | if (entry->the_bfd != NULL) |
| 379 | return; |
| 380 | |
| 381 | if (! entry->search_dirs_flag) |
| 382 | { |
| 383 | if (ldfile_try_open_bfd (entry->filename, entry)) |
| 384 | return; |
| 385 | if (strcmp (entry->filename, entry->local_sym_name) != 0) |
| 386 | einfo (_("%F%P: %s (%s): No such file: %E\n"), |
| 387 | entry->filename, entry->local_sym_name); |
| 388 | else |
| 389 | einfo (_("%F%P: %s: No such file: %E\n"), entry->local_sym_name); |
| 390 | } |
| 391 | else |
| 392 | { |
| 393 | search_arch_type *arch; |
| 394 | bfd_boolean found = FALSE; |
| 395 | |
| 396 | /* Try to open <filename><suffix> or lib<filename><suffix>.a */ |
| 397 | for (arch = search_arch_head; arch != NULL; arch = arch->next) |
| 398 | { |
| 399 | found = ldfile_open_file_search (arch->name, entry, "lib", ".a"); |
| 400 | if (found) |
| 401 | break; |
| 402 | #ifdef VMS |
| 403 | found = ldfile_open_file_search (arch->name, entry, ":lib", ".a"); |
| 404 | if (found) |
| 405 | break; |
| 406 | #endif |
| 407 | found = ldemul_find_potential_libraries (arch->name, entry); |
| 408 | if (found) |
| 409 | break; |
| 410 | } |
| 411 | |
| 412 | /* If we have found the file, we don't need to search directories |
| 413 | again. */ |
| 414 | if (found) |
| 415 | entry->search_dirs_flag = FALSE; |
| 416 | else if (entry->sysrooted |
| 417 | && ld_sysroot |
| 418 | && IS_ABSOLUTE_PATH (entry->local_sym_name)) |
| 419 | einfo (_("%F%P: cannot find %s inside %s\n"), |
| 420 | entry->local_sym_name, ld_sysroot); |
| 421 | else |
| 422 | einfo (_("%F%P: cannot find %s\n"), entry->local_sym_name); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | /* Try to open NAME; if that fails, try NAME with EXTEN appended to it. */ |
| 427 | |
| 428 | static FILE * |
| 429 | try_open (const char *name, const char *exten) |
| 430 | { |
| 431 | FILE *result; |
| 432 | char buff[1000]; |
| 433 | |
| 434 | result = fopen (name, "r"); |
| 435 | |
| 436 | if (trace_file_tries) |
| 437 | { |
| 438 | if (result == NULL) |
| 439 | info_msg (_("cannot find script file %s\n"), name); |
| 440 | else |
| 441 | info_msg (_("opened script file %s\n"), name); |
| 442 | } |
| 443 | |
| 444 | if (result != NULL) |
| 445 | return result; |
| 446 | |
| 447 | if (*exten) |
| 448 | { |
| 449 | sprintf (buff, "%s%s", name, exten); |
| 450 | result = fopen (buff, "r"); |
| 451 | |
| 452 | if (trace_file_tries) |
| 453 | { |
| 454 | if (result == NULL) |
| 455 | info_msg (_("cannot find script file %s\n"), buff); |
| 456 | else |
| 457 | info_msg (_("opened script file %s\n"), buff); |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | return result; |
| 462 | } |
| 463 | |
| 464 | /* Try to open NAME; if that fails, look for it in any directories |
| 465 | specified with -L, without and with EXTEND appended. */ |
| 466 | |
| 467 | static FILE * |
| 468 | ldfile_find_command_file (const char *name, const char *extend) |
| 469 | { |
| 470 | search_dirs_type *search; |
| 471 | FILE *result; |
| 472 | char buffer[1000]; |
| 473 | |
| 474 | /* First try raw name. */ |
| 475 | result = try_open (name, ""); |
| 476 | if (result == NULL) |
| 477 | { |
| 478 | /* Try now prefixes. */ |
| 479 | for (search = search_head; search != NULL; search = search->next) |
| 480 | { |
| 481 | sprintf (buffer, "%s%s%s", search->name, slash, name); |
| 482 | |
| 483 | result = try_open (buffer, extend); |
| 484 | if (result) |
| 485 | break; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | return result; |
| 490 | } |
| 491 | |
| 492 | void |
| 493 | ldfile_open_command_file (const char *name) |
| 494 | { |
| 495 | FILE *ldlex_input_stack; |
| 496 | ldlex_input_stack = ldfile_find_command_file (name, ""); |
| 497 | |
| 498 | if (ldlex_input_stack == NULL) |
| 499 | { |
| 500 | bfd_set_error (bfd_error_system_call); |
| 501 | einfo (_("%P%F: cannot open linker script file %s: %E\n"), name); |
| 502 | } |
| 503 | |
| 504 | lex_push_file (ldlex_input_stack, name); |
| 505 | |
| 506 | ldfile_input_filename = name; |
| 507 | lineno = 1; |
| 508 | |
| 509 | saved_script_handle = ldlex_input_stack; |
| 510 | } |
| 511 | |
| 512 | void |
| 513 | ldfile_add_arch (const char *in_name) |
| 514 | { |
| 515 | char *name = xstrdup (in_name); |
| 516 | search_arch_type *new = xmalloc (sizeof (search_arch_type)); |
| 517 | |
| 518 | ldfile_output_machine_name = in_name; |
| 519 | |
| 520 | new->name = name; |
| 521 | new->next = NULL; |
| 522 | while (*name) |
| 523 | { |
| 524 | *name = TOLOWER (*name); |
| 525 | name++; |
| 526 | } |
| 527 | *search_arch_tail_ptr = new; |
| 528 | search_arch_tail_ptr = &new->next; |
| 529 | |
| 530 | } |
| 531 | |
| 532 | /* Set the output architecture. */ |
| 533 | |
| 534 | void |
| 535 | ldfile_set_output_arch (const char *string, enum bfd_architecture defarch) |
| 536 | { |
| 537 | const bfd_arch_info_type *arch = bfd_scan_arch (string); |
| 538 | |
| 539 | if (arch) |
| 540 | { |
| 541 | ldfile_output_architecture = arch->arch; |
| 542 | ldfile_output_machine = arch->mach; |
| 543 | ldfile_output_machine_name = arch->printable_name; |
| 544 | } |
| 545 | else if (defarch != bfd_arch_unknown) |
| 546 | ldfile_output_architecture = defarch; |
| 547 | else |
| 548 | einfo (_("%P%F: cannot represent machine `%s'\n"), string); |
| 549 | } |