| 1 | /* Main program of GNU linker. |
| 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, |
| 3 | 2002, 2003, 2004 |
| 4 | Free Software Foundation, Inc. |
| 5 | Written by Steve Chamberlain steve@cygnus.com |
| 6 | |
| 7 | This file is part of GLD, the Gnu Linker. |
| 8 | |
| 9 | GLD is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2, or (at your option) |
| 12 | any later version. |
| 13 | |
| 14 | GLD is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with GLD; see the file COPYING. If not, write to the Free |
| 21 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 22 | 02111-1307, USA. */ |
| 23 | |
| 24 | #include "bfd.h" |
| 25 | #include "sysdep.h" |
| 26 | #include <stdio.h> |
| 27 | #include "safe-ctype.h" |
| 28 | #include "libiberty.h" |
| 29 | #include "progress.h" |
| 30 | #include "bfdlink.h" |
| 31 | #include "filenames.h" |
| 32 | |
| 33 | #include "ld.h" |
| 34 | #include "ldmain.h" |
| 35 | #include "ldmisc.h" |
| 36 | #include "ldwrite.h" |
| 37 | #include "ldexp.h" |
| 38 | #include "ldlang.h" |
| 39 | #include <ldgram.h> |
| 40 | #include "ldlex.h" |
| 41 | #include "ldfile.h" |
| 42 | #include "ldemul.h" |
| 43 | #include "ldctor.h" |
| 44 | |
| 45 | /* Somewhere above, sys/stat.h got included. */ |
| 46 | #if !defined(S_ISDIR) && defined(S_IFDIR) |
| 47 | #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) |
| 48 | #endif |
| 49 | |
| 50 | #include <string.h> |
| 51 | |
| 52 | #ifdef HAVE_SBRK |
| 53 | #ifdef NEED_DECLARATION_SBRK |
| 54 | extern void *sbrk (); |
| 55 | #endif |
| 56 | #endif |
| 57 | |
| 58 | #ifndef TARGET_SYSTEM_ROOT |
| 59 | #define TARGET_SYSTEM_ROOT "" |
| 60 | #endif |
| 61 | |
| 62 | /* EXPORTS */ |
| 63 | |
| 64 | char *default_target; |
| 65 | const char *output_filename = "a.out"; |
| 66 | |
| 67 | /* Name this program was invoked by. */ |
| 68 | char *program_name; |
| 69 | |
| 70 | /* The prefix for system library directories. */ |
| 71 | char *ld_sysroot; |
| 72 | |
| 73 | /* The canonical representation of ld_sysroot. */ |
| 74 | char * ld_canon_sysroot; |
| 75 | int ld_canon_sysroot_len; |
| 76 | |
| 77 | /* The file that we're creating. */ |
| 78 | bfd *output_bfd = 0; |
| 79 | |
| 80 | /* Set by -G argument, for MIPS ECOFF target. */ |
| 81 | int g_switch_value = 8; |
| 82 | |
| 83 | /* Nonzero means print names of input files as processed. */ |
| 84 | bfd_boolean trace_files; |
| 85 | |
| 86 | /* Nonzero means same, but note open failures, too. */ |
| 87 | bfd_boolean trace_file_tries; |
| 88 | |
| 89 | /* Nonzero means version number was printed, so exit successfully |
| 90 | instead of complaining if no input files are given. */ |
| 91 | bfd_boolean version_printed; |
| 92 | |
| 93 | /* Nonzero means link in every member of an archive. */ |
| 94 | bfd_boolean whole_archive; |
| 95 | |
| 96 | /* Nonzero means create DT_NEEDED entries only if a dynamic library |
| 97 | actually satisfies some reference in a regular object. */ |
| 98 | bfd_boolean as_needed; |
| 99 | |
| 100 | /* TRUE if we should demangle symbol names. */ |
| 101 | bfd_boolean demangling; |
| 102 | |
| 103 | args_type command_line; |
| 104 | |
| 105 | ld_config_type config; |
| 106 | |
| 107 | static char *get_emulation |
| 108 | (int, char **); |
| 109 | static void set_scripts_dir |
| 110 | (void); |
| 111 | static bfd_boolean add_archive_element |
| 112 | (struct bfd_link_info *, bfd *, const char *); |
| 113 | static bfd_boolean multiple_definition |
| 114 | (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma, |
| 115 | bfd *, asection *, bfd_vma); |
| 116 | static bfd_boolean multiple_common |
| 117 | (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type, |
| 118 | bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma); |
| 119 | static bfd_boolean add_to_set |
| 120 | (struct bfd_link_info *, struct bfd_link_hash_entry *, |
| 121 | bfd_reloc_code_real_type, bfd *, asection *, bfd_vma); |
| 122 | static bfd_boolean constructor_callback |
| 123 | (struct bfd_link_info *, bfd_boolean, const char *, bfd *, |
| 124 | asection *, bfd_vma); |
| 125 | static bfd_boolean warning_callback |
| 126 | (struct bfd_link_info *, const char *, const char *, bfd *, |
| 127 | asection *, bfd_vma); |
| 128 | static void warning_find_reloc |
| 129 | (bfd *, asection *, void *); |
| 130 | static bfd_boolean undefined_symbol |
| 131 | (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma, |
| 132 | bfd_boolean); |
| 133 | static bfd_boolean reloc_overflow |
| 134 | (struct bfd_link_info *, const char *, const char *, bfd_vma, |
| 135 | bfd *, asection *, bfd_vma); |
| 136 | static bfd_boolean reloc_dangerous |
| 137 | (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma); |
| 138 | static bfd_boolean unattached_reloc |
| 139 | (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma); |
| 140 | static bfd_boolean notice |
| 141 | (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma); |
| 142 | |
| 143 | static struct bfd_link_callbacks link_callbacks = |
| 144 | { |
| 145 | add_archive_element, |
| 146 | multiple_definition, |
| 147 | multiple_common, |
| 148 | add_to_set, |
| 149 | constructor_callback, |
| 150 | warning_callback, |
| 151 | undefined_symbol, |
| 152 | reloc_overflow, |
| 153 | reloc_dangerous, |
| 154 | unattached_reloc, |
| 155 | notice, |
| 156 | error_handler |
| 157 | }; |
| 158 | |
| 159 | struct bfd_link_info link_info; |
| 160 | \f |
| 161 | static void |
| 162 | remove_output (void) |
| 163 | { |
| 164 | if (output_filename) |
| 165 | { |
| 166 | if (output_bfd) |
| 167 | bfd_cache_close (output_bfd); |
| 168 | if (delete_output_file_on_failure) |
| 169 | unlink (output_filename); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | int |
| 174 | main (int argc, char **argv) |
| 175 | { |
| 176 | char *emulation; |
| 177 | long start_time = get_run_time (); |
| 178 | |
| 179 | #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES) |
| 180 | setlocale (LC_MESSAGES, ""); |
| 181 | #endif |
| 182 | #if defined (HAVE_SETLOCALE) |
| 183 | setlocale (LC_CTYPE, ""); |
| 184 | #endif |
| 185 | bindtextdomain (PACKAGE, LOCALEDIR); |
| 186 | textdomain (PACKAGE); |
| 187 | |
| 188 | program_name = argv[0]; |
| 189 | xmalloc_set_program_name (program_name); |
| 190 | |
| 191 | START_PROGRESS (program_name, 0); |
| 192 | |
| 193 | bfd_init (); |
| 194 | |
| 195 | bfd_set_error_program_name (program_name); |
| 196 | |
| 197 | xatexit (remove_output); |
| 198 | |
| 199 | #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE |
| 200 | ld_sysroot = make_relative_prefix (program_name, BINDIR, |
| 201 | TARGET_SYSTEM_ROOT); |
| 202 | |
| 203 | if (ld_sysroot) |
| 204 | { |
| 205 | struct stat s; |
| 206 | int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode); |
| 207 | |
| 208 | if (!res) |
| 209 | { |
| 210 | free (ld_sysroot); |
| 211 | ld_sysroot = NULL; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | if (! ld_sysroot) |
| 216 | { |
| 217 | ld_sysroot = make_relative_prefix (program_name, TOOLBINDIR, |
| 218 | TARGET_SYSTEM_ROOT); |
| 219 | |
| 220 | if (ld_sysroot) |
| 221 | { |
| 222 | struct stat s; |
| 223 | int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode); |
| 224 | |
| 225 | if (!res) |
| 226 | { |
| 227 | free (ld_sysroot); |
| 228 | ld_sysroot = NULL; |
| 229 | } |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | if (! ld_sysroot) |
| 234 | #endif |
| 235 | ld_sysroot = TARGET_SYSTEM_ROOT; |
| 236 | |
| 237 | if (ld_sysroot && *ld_sysroot) |
| 238 | ld_canon_sysroot = lrealpath (ld_sysroot); |
| 239 | |
| 240 | if (ld_canon_sysroot) |
| 241 | ld_canon_sysroot_len = strlen (ld_canon_sysroot); |
| 242 | else |
| 243 | ld_canon_sysroot_len = -1; |
| 244 | |
| 245 | /* Set the default BFD target based on the configured target. Doing |
| 246 | this permits the linker to be configured for a particular target, |
| 247 | and linked against a shared BFD library which was configured for |
| 248 | a different target. The macro TARGET is defined by Makefile. */ |
| 249 | if (! bfd_set_default_target (TARGET)) |
| 250 | { |
| 251 | einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET); |
| 252 | xexit (1); |
| 253 | } |
| 254 | |
| 255 | #if YYDEBUG |
| 256 | { |
| 257 | extern int yydebug; |
| 258 | yydebug = 1; |
| 259 | } |
| 260 | #endif |
| 261 | |
| 262 | /* Initialize the data about options. */ |
| 263 | trace_files = trace_file_tries = version_printed = FALSE; |
| 264 | whole_archive = FALSE; |
| 265 | config.build_constructors = TRUE; |
| 266 | config.dynamic_link = FALSE; |
| 267 | config.has_shared = FALSE; |
| 268 | config.split_by_reloc = (unsigned) -1; |
| 269 | config.split_by_file = (bfd_size_type) -1; |
| 270 | config.hash_table_size = 0; |
| 271 | command_line.force_common_definition = FALSE; |
| 272 | command_line.inhibit_common_definition = FALSE; |
| 273 | command_line.interpreter = NULL; |
| 274 | command_line.rpath = NULL; |
| 275 | command_line.warn_mismatch = TRUE; |
| 276 | command_line.check_section_addresses = TRUE; |
| 277 | command_line.accept_unknown_input_arch = FALSE; |
| 278 | command_line.reduce_memory_overheads = FALSE; |
| 279 | |
| 280 | /* We initialize DEMANGLING based on the environment variable |
| 281 | COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the |
| 282 | output of the linker, unless COLLECT_NO_DEMANGLE is set in the |
| 283 | environment. Acting the same way here lets us provide the same |
| 284 | interface by default. */ |
| 285 | demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL; |
| 286 | |
| 287 | link_info.relocatable = FALSE; |
| 288 | link_info.emitrelocations = FALSE; |
| 289 | link_info.task_link = FALSE; |
| 290 | link_info.shared = FALSE; |
| 291 | link_info.pie = FALSE; |
| 292 | link_info.executable = FALSE; |
| 293 | link_info.symbolic = FALSE; |
| 294 | link_info.export_dynamic = FALSE; |
| 295 | link_info.static_link = FALSE; |
| 296 | link_info.traditional_format = FALSE; |
| 297 | link_info.optimize = FALSE; |
| 298 | link_info.unresolved_syms_in_objects = RM_NOT_YET_SET; |
| 299 | link_info.unresolved_syms_in_shared_libs = RM_NOT_YET_SET; |
| 300 | link_info.allow_multiple_definition = FALSE; |
| 301 | link_info.allow_undefined_version = TRUE; |
| 302 | link_info.keep_memory = TRUE; |
| 303 | link_info.notice_all = FALSE; |
| 304 | link_info.nocopyreloc = FALSE; |
| 305 | link_info.new_dtags = FALSE; |
| 306 | link_info.combreloc = TRUE; |
| 307 | link_info.eh_frame_hdr = FALSE; |
| 308 | link_info.relro = FALSE; |
| 309 | link_info.strip_discarded = TRUE; |
| 310 | link_info.strip = strip_none; |
| 311 | link_info.discard = discard_sec_merge; |
| 312 | link_info.common_skip_ar_aymbols = bfd_link_common_skip_none; |
| 313 | link_info.callbacks = &link_callbacks; |
| 314 | link_info.hash = NULL; |
| 315 | link_info.keep_hash = NULL; |
| 316 | link_info.notice_hash = NULL; |
| 317 | link_info.wrap_hash = NULL; |
| 318 | link_info.input_bfds = NULL; |
| 319 | link_info.create_object_symbols_section = NULL; |
| 320 | link_info.gc_sym_list = NULL; |
| 321 | link_info.base_file = NULL; |
| 322 | /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init |
| 323 | and _fini symbols. We are compatible. */ |
| 324 | link_info.init_function = "_init"; |
| 325 | link_info.fini_function = "_fini"; |
| 326 | link_info.pei386_auto_import = -1; |
| 327 | link_info.pei386_runtime_pseudo_reloc = FALSE; |
| 328 | link_info.spare_dynamic_tags = 5; |
| 329 | link_info.flags = 0; |
| 330 | link_info.flags_1 = 0; |
| 331 | link_info.need_relax_finalize = FALSE; |
| 332 | |
| 333 | ldfile_add_arch (""); |
| 334 | |
| 335 | config.make_executable = TRUE; |
| 336 | force_make_executable = FALSE; |
| 337 | config.magic_demand_paged = TRUE; |
| 338 | config.text_read_only = TRUE; |
| 339 | |
| 340 | emulation = get_emulation (argc, argv); |
| 341 | ldemul_choose_mode (emulation); |
| 342 | default_target = ldemul_choose_target (argc, argv); |
| 343 | lang_init (); |
| 344 | ldemul_before_parse (); |
| 345 | lang_has_input_file = FALSE; |
| 346 | parse_args (argc, argv); |
| 347 | |
| 348 | if (config.hash_table_size != 0) |
| 349 | bfd_hash_set_default_size (config.hash_table_size); |
| 350 | |
| 351 | ldemul_set_symbols (); |
| 352 | |
| 353 | if (link_info.relocatable) |
| 354 | { |
| 355 | if (command_line.gc_sections) |
| 356 | einfo ("%P%F: --gc-sections and -r may not be used together\n"); |
| 357 | else if (command_line.relax) |
| 358 | einfo (_("%P%F: --relax and -r may not be used together\n")); |
| 359 | if (link_info.shared) |
| 360 | einfo (_("%P%F: -r and -shared may not be used together\n")); |
| 361 | } |
| 362 | |
| 363 | if (! link_info.shared) |
| 364 | { |
| 365 | if (command_line.filter_shlib) |
| 366 | einfo (_("%P%F: -F may not be used without -shared\n")); |
| 367 | if (command_line.auxiliary_filters) |
| 368 | einfo (_("%P%F: -f may not be used without -shared\n")); |
| 369 | } |
| 370 | |
| 371 | if (! link_info.shared || link_info.pie) |
| 372 | link_info.executable = TRUE; |
| 373 | |
| 374 | /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I |
| 375 | don't see how else this can be handled, since in this case we |
| 376 | must preserve all externally visible symbols. */ |
| 377 | if (link_info.relocatable && link_info.strip == strip_all) |
| 378 | { |
| 379 | link_info.strip = strip_debugger; |
| 380 | if (link_info.discard == discard_sec_merge) |
| 381 | link_info.discard = discard_all; |
| 382 | } |
| 383 | |
| 384 | /* This essentially adds another -L directory so this must be done after |
| 385 | the -L's in argv have been processed. */ |
| 386 | set_scripts_dir (); |
| 387 | |
| 388 | /* If we have not already opened and parsed a linker script |
| 389 | read the emulation's appropriate default script. */ |
| 390 | if (saved_script_handle == NULL) |
| 391 | { |
| 392 | int isfile; |
| 393 | char *s = ldemul_get_script (&isfile); |
| 394 | |
| 395 | if (isfile) |
| 396 | ldfile_open_command_file (s); |
| 397 | else |
| 398 | { |
| 399 | lex_string = s; |
| 400 | lex_redirect (s); |
| 401 | } |
| 402 | parser_input = input_script; |
| 403 | yyparse (); |
| 404 | lex_string = NULL; |
| 405 | } |
| 406 | |
| 407 | if (trace_file_tries) |
| 408 | { |
| 409 | if (saved_script_handle) |
| 410 | info_msg (_("using external linker script:")); |
| 411 | else |
| 412 | info_msg (_("using internal linker script:")); |
| 413 | info_msg ("\n==================================================\n"); |
| 414 | |
| 415 | if (saved_script_handle) |
| 416 | { |
| 417 | static const int ld_bufsz = 8193; |
| 418 | size_t n; |
| 419 | char *buf = xmalloc (ld_bufsz); |
| 420 | |
| 421 | rewind (saved_script_handle); |
| 422 | while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0) |
| 423 | { |
| 424 | buf[n] = 0; |
| 425 | info_msg (buf); |
| 426 | } |
| 427 | rewind (saved_script_handle); |
| 428 | free (buf); |
| 429 | } |
| 430 | else |
| 431 | { |
| 432 | int isfile; |
| 433 | |
| 434 | info_msg (ldemul_get_script (&isfile)); |
| 435 | } |
| 436 | |
| 437 | info_msg ("\n==================================================\n"); |
| 438 | } |
| 439 | |
| 440 | lang_final (); |
| 441 | |
| 442 | if (!lang_has_input_file) |
| 443 | { |
| 444 | if (version_printed) |
| 445 | xexit (0); |
| 446 | einfo (_("%P%F: no input files\n")); |
| 447 | } |
| 448 | |
| 449 | if (trace_files) |
| 450 | info_msg (_("%P: mode %s\n"), emulation); |
| 451 | |
| 452 | ldemul_after_parse (); |
| 453 | |
| 454 | if (config.map_filename) |
| 455 | { |
| 456 | if (strcmp (config.map_filename, "-") == 0) |
| 457 | { |
| 458 | config.map_file = stdout; |
| 459 | } |
| 460 | else |
| 461 | { |
| 462 | config.map_file = fopen (config.map_filename, FOPEN_WT); |
| 463 | if (config.map_file == (FILE *) NULL) |
| 464 | { |
| 465 | bfd_set_error (bfd_error_system_call); |
| 466 | einfo (_("%P%F: cannot open map file %s: %E\n"), |
| 467 | config.map_filename); |
| 468 | } |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | lang_process (); |
| 473 | |
| 474 | /* Print error messages for any missing symbols, for any warning |
| 475 | symbols, and possibly multiple definitions. */ |
| 476 | if (link_info.relocatable) |
| 477 | output_bfd->flags &= ~EXEC_P; |
| 478 | else |
| 479 | output_bfd->flags |= EXEC_P; |
| 480 | |
| 481 | ldwrite (); |
| 482 | |
| 483 | if (config.map_file != NULL) |
| 484 | lang_map (); |
| 485 | if (command_line.cref) |
| 486 | output_cref (config.map_file != NULL ? config.map_file : stdout); |
| 487 | if (nocrossref_list != NULL) |
| 488 | check_nocrossrefs (); |
| 489 | |
| 490 | /* Even if we're producing relocatable output, some non-fatal errors should |
| 491 | be reported in the exit status. (What non-fatal errors, if any, do we |
| 492 | want to ignore for relocatable output?) */ |
| 493 | if (!config.make_executable && !force_make_executable) |
| 494 | { |
| 495 | if (trace_files) |
| 496 | einfo (_("%P: link errors found, deleting executable `%s'\n"), |
| 497 | output_filename); |
| 498 | |
| 499 | /* The file will be removed by remove_output. */ |
| 500 | xexit (1); |
| 501 | } |
| 502 | else |
| 503 | { |
| 504 | if (! bfd_close (output_bfd)) |
| 505 | einfo (_("%F%B: final close failed: %E\n"), output_bfd); |
| 506 | |
| 507 | /* If the --force-exe-suffix is enabled, and we're making an |
| 508 | executable file and it doesn't end in .exe, copy it to one |
| 509 | which does. */ |
| 510 | if (! link_info.relocatable && command_line.force_exe_suffix) |
| 511 | { |
| 512 | int len = strlen (output_filename); |
| 513 | |
| 514 | if (len < 4 |
| 515 | || (strcasecmp (output_filename + len - 4, ".exe") != 0 |
| 516 | && strcasecmp (output_filename + len - 4, ".dll") != 0)) |
| 517 | { |
| 518 | FILE *src; |
| 519 | FILE *dst; |
| 520 | const int bsize = 4096; |
| 521 | char *buf = xmalloc (bsize); |
| 522 | int l; |
| 523 | char *dst_name = xmalloc (len + 5); |
| 524 | |
| 525 | strcpy (dst_name, output_filename); |
| 526 | strcat (dst_name, ".exe"); |
| 527 | src = fopen (output_filename, FOPEN_RB); |
| 528 | dst = fopen (dst_name, FOPEN_WB); |
| 529 | |
| 530 | if (!src) |
| 531 | einfo (_("%X%P: unable to open for source of copy `%s'\n"), |
| 532 | output_filename); |
| 533 | if (!dst) |
| 534 | einfo (_("%X%P: unable to open for destination of copy `%s'\n"), |
| 535 | dst_name); |
| 536 | while ((l = fread (buf, 1, bsize, src)) > 0) |
| 537 | { |
| 538 | int done = fwrite (buf, 1, l, dst); |
| 539 | |
| 540 | if (done != l) |
| 541 | einfo (_("%P: Error writing file `%s'\n"), dst_name); |
| 542 | } |
| 543 | |
| 544 | fclose (src); |
| 545 | if (fclose (dst) == EOF) |
| 546 | einfo (_("%P: Error closing file `%s'\n"), dst_name); |
| 547 | free (dst_name); |
| 548 | free (buf); |
| 549 | } |
| 550 | } |
| 551 | } |
| 552 | |
| 553 | END_PROGRESS (program_name); |
| 554 | |
| 555 | if (config.stats) |
| 556 | { |
| 557 | #ifdef HAVE_SBRK |
| 558 | char *lim = sbrk (0); |
| 559 | #endif |
| 560 | long run_time = get_run_time () - start_time; |
| 561 | |
| 562 | fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"), |
| 563 | program_name, run_time / 1000000, run_time % 1000000); |
| 564 | #ifdef HAVE_SBRK |
| 565 | fprintf (stderr, _("%s: data size %ld\n"), program_name, |
| 566 | (long) (lim - (char *) &environ)); |
| 567 | #endif |
| 568 | } |
| 569 | |
| 570 | /* Prevent remove_output from doing anything, after a successful link. */ |
| 571 | output_filename = NULL; |
| 572 | |
| 573 | xexit (0); |
| 574 | return 0; |
| 575 | } |
| 576 | |
| 577 | /* We need to find any explicitly given emulation in order to initialize the |
| 578 | state that's needed by the lex&yacc argument parser (parse_args). */ |
| 579 | |
| 580 | static char * |
| 581 | get_emulation (int argc, char **argv) |
| 582 | { |
| 583 | char *emulation; |
| 584 | int i; |
| 585 | |
| 586 | emulation = getenv (EMULATION_ENVIRON); |
| 587 | if (emulation == NULL) |
| 588 | emulation = DEFAULT_EMULATION; |
| 589 | |
| 590 | for (i = 1; i < argc; i++) |
| 591 | { |
| 592 | if (!strncmp (argv[i], "-m", 2)) |
| 593 | { |
| 594 | if (argv[i][2] == '\0') |
| 595 | { |
| 596 | /* -m EMUL */ |
| 597 | if (i < argc - 1) |
| 598 | { |
| 599 | emulation = argv[i + 1]; |
| 600 | i++; |
| 601 | } |
| 602 | else |
| 603 | einfo (_("%P%F: missing argument to -m\n")); |
| 604 | } |
| 605 | else if (strcmp (argv[i], "-mips1") == 0 |
| 606 | || strcmp (argv[i], "-mips2") == 0 |
| 607 | || strcmp (argv[i], "-mips3") == 0 |
| 608 | || strcmp (argv[i], "-mips4") == 0 |
| 609 | || strcmp (argv[i], "-mips5") == 0 |
| 610 | || strcmp (argv[i], "-mips32") == 0 |
| 611 | || strcmp (argv[i], "-mips32r2") == 0 |
| 612 | || strcmp (argv[i], "-mips64") == 0 |
| 613 | || strcmp (argv[i], "-mips64r2") == 0) |
| 614 | { |
| 615 | /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are |
| 616 | passed to the linker by some MIPS compilers. They |
| 617 | generally tell the linker to use a slightly different |
| 618 | library path. Perhaps someday these should be |
| 619 | implemented as emulations; until then, we just ignore |
| 620 | the arguments and hope that nobody ever creates |
| 621 | emulations named ips1, ips2 or ips3. */ |
| 622 | } |
| 623 | else if (strcmp (argv[i], "-m486") == 0) |
| 624 | { |
| 625 | /* FIXME: The argument -m486 is passed to the linker on |
| 626 | some Linux systems. Hope that nobody creates an |
| 627 | emulation named 486. */ |
| 628 | } |
| 629 | else |
| 630 | { |
| 631 | /* -mEMUL */ |
| 632 | emulation = &argv[i][2]; |
| 633 | } |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | return emulation; |
| 638 | } |
| 639 | |
| 640 | /* If directory DIR contains an "ldscripts" subdirectory, |
| 641 | add DIR to the library search path and return TRUE, |
| 642 | else return FALSE. */ |
| 643 | |
| 644 | static bfd_boolean |
| 645 | check_for_scripts_dir (char *dir) |
| 646 | { |
| 647 | size_t dirlen; |
| 648 | char *buf; |
| 649 | struct stat s; |
| 650 | bfd_boolean res; |
| 651 | |
| 652 | dirlen = strlen (dir); |
| 653 | /* sizeof counts the terminating NUL. */ |
| 654 | buf = xmalloc (dirlen + sizeof ("/ldscripts")); |
| 655 | sprintf (buf, "%s/ldscripts", dir); |
| 656 | |
| 657 | res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode); |
| 658 | free (buf); |
| 659 | if (res) |
| 660 | ldfile_add_library_path (dir, FALSE); |
| 661 | return res; |
| 662 | } |
| 663 | |
| 664 | /* Set the default directory for finding script files. |
| 665 | Libraries will be searched for here too, but that's ok. |
| 666 | We look for the "ldscripts" directory in: |
| 667 | |
| 668 | SCRIPTDIR (passed from Makefile) |
| 669 | (adjusted according to the current location of the binary) |
| 670 | SCRIPTDIR (passed from Makefile) |
| 671 | the dir where this program is (for using it from the build tree) |
| 672 | the dir where this program is/../lib |
| 673 | (for installing the tool suite elsewhere). */ |
| 674 | |
| 675 | static void |
| 676 | set_scripts_dir (void) |
| 677 | { |
| 678 | char *end, *dir; |
| 679 | size_t dirlen; |
| 680 | bfd_boolean found; |
| 681 | |
| 682 | dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR); |
| 683 | if (dir) |
| 684 | { |
| 685 | found = check_for_scripts_dir (dir); |
| 686 | free (dir); |
| 687 | if (found) |
| 688 | return; |
| 689 | } |
| 690 | |
| 691 | dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR); |
| 692 | if (dir) |
| 693 | { |
| 694 | found = check_for_scripts_dir (dir); |
| 695 | free (dir); |
| 696 | if (found) |
| 697 | return; |
| 698 | } |
| 699 | |
| 700 | if (check_for_scripts_dir (SCRIPTDIR)) |
| 701 | /* We've been installed normally. */ |
| 702 | return; |
| 703 | |
| 704 | /* Look for "ldscripts" in the dir where our binary is. */ |
| 705 | end = strrchr (program_name, '/'); |
| 706 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
| 707 | { |
| 708 | /* We could have \foo\bar, or /foo\bar. */ |
| 709 | char *bslash = strrchr (program_name, '\\'); |
| 710 | |
| 711 | if (end == NULL || (bslash != NULL && bslash > end)) |
| 712 | end = bslash; |
| 713 | } |
| 714 | #endif |
| 715 | |
| 716 | if (end == NULL) |
| 717 | /* Don't look for ldscripts in the current directory. There is |
| 718 | too much potential for confusion. */ |
| 719 | return; |
| 720 | |
| 721 | dirlen = end - program_name; |
| 722 | /* Make a copy of program_name in dir. |
| 723 | Leave room for later "/../lib". */ |
| 724 | dir = xmalloc (dirlen + 8); |
| 725 | strncpy (dir, program_name, dirlen); |
| 726 | dir[dirlen] = '\0'; |
| 727 | |
| 728 | if (check_for_scripts_dir (dir)) |
| 729 | { |
| 730 | free (dir); |
| 731 | return; |
| 732 | } |
| 733 | |
| 734 | /* Look for "ldscripts" in <the dir where our binary is>/../lib. */ |
| 735 | strcpy (dir + dirlen, "/../lib"); |
| 736 | check_for_scripts_dir (dir); |
| 737 | free (dir); |
| 738 | } |
| 739 | |
| 740 | void |
| 741 | add_ysym (const char *name) |
| 742 | { |
| 743 | if (link_info.notice_hash == NULL) |
| 744 | { |
| 745 | link_info.notice_hash = xmalloc (sizeof (struct bfd_hash_table)); |
| 746 | if (! bfd_hash_table_init_n (link_info.notice_hash, |
| 747 | bfd_hash_newfunc, |
| 748 | 61)) |
| 749 | einfo (_("%P%F: bfd_hash_table_init failed: %E\n")); |
| 750 | } |
| 751 | |
| 752 | if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL) |
| 753 | einfo (_("%P%F: bfd_hash_lookup failed: %E\n")); |
| 754 | } |
| 755 | |
| 756 | /* Record a symbol to be wrapped, from the --wrap option. */ |
| 757 | |
| 758 | void |
| 759 | add_wrap (const char *name) |
| 760 | { |
| 761 | if (link_info.wrap_hash == NULL) |
| 762 | { |
| 763 | link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table)); |
| 764 | if (! bfd_hash_table_init_n (link_info.wrap_hash, |
| 765 | bfd_hash_newfunc, |
| 766 | 61)) |
| 767 | einfo (_("%P%F: bfd_hash_table_init failed: %E\n")); |
| 768 | } |
| 769 | |
| 770 | if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL) |
| 771 | einfo (_("%P%F: bfd_hash_lookup failed: %E\n")); |
| 772 | } |
| 773 | |
| 774 | /* Handle the -retain-symbols-file option. */ |
| 775 | |
| 776 | void |
| 777 | add_keepsyms_file (const char *filename) |
| 778 | { |
| 779 | FILE *file; |
| 780 | char *buf; |
| 781 | size_t bufsize; |
| 782 | int c; |
| 783 | |
| 784 | if (link_info.strip == strip_some) |
| 785 | einfo (_("%X%P: error: duplicate retain-symbols-file\n")); |
| 786 | |
| 787 | file = fopen (filename, "r"); |
| 788 | if (file == NULL) |
| 789 | { |
| 790 | bfd_set_error (bfd_error_system_call); |
| 791 | einfo ("%X%P: %s: %E\n", filename); |
| 792 | return; |
| 793 | } |
| 794 | |
| 795 | link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table)); |
| 796 | if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc)) |
| 797 | einfo (_("%P%F: bfd_hash_table_init failed: %E\n")); |
| 798 | |
| 799 | bufsize = 100; |
| 800 | buf = xmalloc (bufsize); |
| 801 | |
| 802 | c = getc (file); |
| 803 | while (c != EOF) |
| 804 | { |
| 805 | while (ISSPACE (c)) |
| 806 | c = getc (file); |
| 807 | |
| 808 | if (c != EOF) |
| 809 | { |
| 810 | size_t len = 0; |
| 811 | |
| 812 | while (! ISSPACE (c) && c != EOF) |
| 813 | { |
| 814 | buf[len] = c; |
| 815 | ++len; |
| 816 | if (len >= bufsize) |
| 817 | { |
| 818 | bufsize *= 2; |
| 819 | buf = xrealloc (buf, bufsize); |
| 820 | } |
| 821 | c = getc (file); |
| 822 | } |
| 823 | |
| 824 | buf[len] = '\0'; |
| 825 | |
| 826 | if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL) |
| 827 | einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n")); |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | if (link_info.strip != strip_none) |
| 832 | einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n")); |
| 833 | |
| 834 | free (buf); |
| 835 | link_info.strip = strip_some; |
| 836 | } |
| 837 | \f |
| 838 | /* Callbacks from the BFD linker routines. */ |
| 839 | |
| 840 | /* This is called when BFD has decided to include an archive member in |
| 841 | a link. */ |
| 842 | |
| 843 | static bfd_boolean |
| 844 | add_archive_element (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 845 | bfd *abfd, |
| 846 | const char *name) |
| 847 | { |
| 848 | lang_input_statement_type *input; |
| 849 | |
| 850 | input = xmalloc (sizeof (lang_input_statement_type)); |
| 851 | input->filename = abfd->filename; |
| 852 | input->local_sym_name = abfd->filename; |
| 853 | input->the_bfd = abfd; |
| 854 | input->asymbols = NULL; |
| 855 | input->next = NULL; |
| 856 | input->just_syms_flag = FALSE; |
| 857 | input->loaded = FALSE; |
| 858 | input->search_dirs_flag = FALSE; |
| 859 | |
| 860 | /* FIXME: The following fields are not set: header.next, |
| 861 | header.type, closed, passive_position, symbol_count, |
| 862 | next_real_file, is_archive, target, real. This bit of code is |
| 863 | from the old decode_library_subfile function. I don't know |
| 864 | whether any of those fields matters. */ |
| 865 | |
| 866 | ldlang_add_file (input); |
| 867 | |
| 868 | if (config.map_file != NULL) |
| 869 | { |
| 870 | static bfd_boolean header_printed; |
| 871 | struct bfd_link_hash_entry *h; |
| 872 | bfd *from; |
| 873 | int len; |
| 874 | |
| 875 | h = bfd_link_hash_lookup (link_info.hash, name, FALSE, FALSE, TRUE); |
| 876 | |
| 877 | if (h == NULL) |
| 878 | from = NULL; |
| 879 | else |
| 880 | { |
| 881 | switch (h->type) |
| 882 | { |
| 883 | default: |
| 884 | from = NULL; |
| 885 | break; |
| 886 | |
| 887 | case bfd_link_hash_defined: |
| 888 | case bfd_link_hash_defweak: |
| 889 | from = h->u.def.section->owner; |
| 890 | break; |
| 891 | |
| 892 | case bfd_link_hash_undefined: |
| 893 | case bfd_link_hash_undefweak: |
| 894 | from = h->u.undef.abfd; |
| 895 | break; |
| 896 | |
| 897 | case bfd_link_hash_common: |
| 898 | from = h->u.c.p->section->owner; |
| 899 | break; |
| 900 | } |
| 901 | } |
| 902 | |
| 903 | if (! header_printed) |
| 904 | { |
| 905 | char buf[100]; |
| 906 | |
| 907 | sprintf (buf, _("Archive member included because of file (symbol)\n\n")); |
| 908 | minfo ("%s", buf); |
| 909 | header_printed = TRUE; |
| 910 | } |
| 911 | |
| 912 | if (bfd_my_archive (abfd) == NULL) |
| 913 | { |
| 914 | minfo ("%s", bfd_get_filename (abfd)); |
| 915 | len = strlen (bfd_get_filename (abfd)); |
| 916 | } |
| 917 | else |
| 918 | { |
| 919 | minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)), |
| 920 | bfd_get_filename (abfd)); |
| 921 | len = (strlen (bfd_get_filename (bfd_my_archive (abfd))) |
| 922 | + strlen (bfd_get_filename (abfd)) |
| 923 | + 2); |
| 924 | } |
| 925 | |
| 926 | if (len >= 29) |
| 927 | { |
| 928 | print_nl (); |
| 929 | len = 0; |
| 930 | } |
| 931 | while (len < 30) |
| 932 | { |
| 933 | print_space (); |
| 934 | ++len; |
| 935 | } |
| 936 | |
| 937 | if (from != NULL) |
| 938 | minfo ("%B ", from); |
| 939 | if (h != NULL) |
| 940 | minfo ("(%T)\n", h->root.string); |
| 941 | else |
| 942 | minfo ("(%s)\n", name); |
| 943 | } |
| 944 | |
| 945 | if (trace_files || trace_file_tries) |
| 946 | info_msg ("%I\n", input); |
| 947 | |
| 948 | return TRUE; |
| 949 | } |
| 950 | |
| 951 | /* This is called when BFD has discovered a symbol which is defined |
| 952 | multiple times. */ |
| 953 | |
| 954 | static bfd_boolean |
| 955 | multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 956 | const char *name, |
| 957 | bfd *obfd, |
| 958 | asection *osec, |
| 959 | bfd_vma oval, |
| 960 | bfd *nbfd, |
| 961 | asection *nsec, |
| 962 | bfd_vma nval) |
| 963 | { |
| 964 | /* If either section has the output_section field set to |
| 965 | bfd_abs_section_ptr, it means that the section is being |
| 966 | discarded, and this is not really a multiple definition at all. |
| 967 | FIXME: It would be cleaner to somehow ignore symbols defined in |
| 968 | sections which are being discarded. */ |
| 969 | if ((osec->output_section != NULL |
| 970 | && ! bfd_is_abs_section (osec) |
| 971 | && bfd_is_abs_section (osec->output_section)) |
| 972 | || (nsec->output_section != NULL |
| 973 | && ! bfd_is_abs_section (nsec) |
| 974 | && bfd_is_abs_section (nsec->output_section))) |
| 975 | return TRUE; |
| 976 | |
| 977 | einfo (_("%X%C: multiple definition of `%T'\n"), |
| 978 | nbfd, nsec, nval, name); |
| 979 | if (obfd != NULL) |
| 980 | einfo (_("%D: first defined here\n"), obfd, osec, oval); |
| 981 | |
| 982 | if (command_line.relax) |
| 983 | { |
| 984 | einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n")); |
| 985 | command_line.relax = 0; |
| 986 | } |
| 987 | |
| 988 | return TRUE; |
| 989 | } |
| 990 | |
| 991 | /* This is called when there is a definition of a common symbol, or |
| 992 | when a common symbol is found for a symbol that is already defined, |
| 993 | or when two common symbols are found. We only do something if |
| 994 | -warn-common was used. */ |
| 995 | |
| 996 | static bfd_boolean |
| 997 | multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 998 | const char *name, |
| 999 | bfd *obfd, |
| 1000 | enum bfd_link_hash_type otype, |
| 1001 | bfd_vma osize, |
| 1002 | bfd *nbfd, |
| 1003 | enum bfd_link_hash_type ntype, |
| 1004 | bfd_vma nsize) |
| 1005 | { |
| 1006 | if (! config.warn_common) |
| 1007 | return TRUE; |
| 1008 | |
| 1009 | if (ntype == bfd_link_hash_defined |
| 1010 | || ntype == bfd_link_hash_defweak |
| 1011 | || ntype == bfd_link_hash_indirect) |
| 1012 | { |
| 1013 | ASSERT (otype == bfd_link_hash_common); |
| 1014 | einfo (_("%B: warning: definition of `%T' overriding common\n"), |
| 1015 | nbfd, name); |
| 1016 | if (obfd != NULL) |
| 1017 | einfo (_("%B: warning: common is here\n"), obfd); |
| 1018 | } |
| 1019 | else if (otype == bfd_link_hash_defined |
| 1020 | || otype == bfd_link_hash_defweak |
| 1021 | || otype == bfd_link_hash_indirect) |
| 1022 | { |
| 1023 | ASSERT (ntype == bfd_link_hash_common); |
| 1024 | einfo (_("%B: warning: common of `%T' overridden by definition\n"), |
| 1025 | nbfd, name); |
| 1026 | if (obfd != NULL) |
| 1027 | einfo (_("%B: warning: defined here\n"), obfd); |
| 1028 | } |
| 1029 | else |
| 1030 | { |
| 1031 | ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common); |
| 1032 | if (osize > nsize) |
| 1033 | { |
| 1034 | einfo (_("%B: warning: common of `%T' overridden by larger common\n"), |
| 1035 | nbfd, name); |
| 1036 | if (obfd != NULL) |
| 1037 | einfo (_("%B: warning: larger common is here\n"), obfd); |
| 1038 | } |
| 1039 | else if (nsize > osize) |
| 1040 | { |
| 1041 | einfo (_("%B: warning: common of `%T' overriding smaller common\n"), |
| 1042 | nbfd, name); |
| 1043 | if (obfd != NULL) |
| 1044 | einfo (_("%B: warning: smaller common is here\n"), obfd); |
| 1045 | } |
| 1046 | else |
| 1047 | { |
| 1048 | einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name); |
| 1049 | if (obfd != NULL) |
| 1050 | einfo (_("%B: warning: previous common is here\n"), obfd); |
| 1051 | } |
| 1052 | } |
| 1053 | |
| 1054 | return TRUE; |
| 1055 | } |
| 1056 | |
| 1057 | /* This is called when BFD has discovered a set element. H is the |
| 1058 | entry in the linker hash table for the set. SECTION and VALUE |
| 1059 | represent a value which should be added to the set. */ |
| 1060 | |
| 1061 | static bfd_boolean |
| 1062 | add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 1063 | struct bfd_link_hash_entry *h, |
| 1064 | bfd_reloc_code_real_type reloc, |
| 1065 | bfd *abfd, |
| 1066 | asection *section, |
| 1067 | bfd_vma value) |
| 1068 | { |
| 1069 | if (config.warn_constructors) |
| 1070 | einfo (_("%P: warning: global constructor %s used\n"), |
| 1071 | h->root.string); |
| 1072 | |
| 1073 | if (! config.build_constructors) |
| 1074 | return TRUE; |
| 1075 | |
| 1076 | ldctor_add_set_entry (h, reloc, NULL, section, value); |
| 1077 | |
| 1078 | if (h->type == bfd_link_hash_new) |
| 1079 | { |
| 1080 | h->type = bfd_link_hash_undefined; |
| 1081 | h->u.undef.abfd = abfd; |
| 1082 | /* We don't call bfd_link_add_undef to add this to the list of |
| 1083 | undefined symbols because we are going to define it |
| 1084 | ourselves. */ |
| 1085 | } |
| 1086 | |
| 1087 | return TRUE; |
| 1088 | } |
| 1089 | |
| 1090 | /* This is called when BFD has discovered a constructor. This is only |
| 1091 | called for some object file formats--those which do not handle |
| 1092 | constructors in some more clever fashion. This is similar to |
| 1093 | adding an element to a set, but less general. */ |
| 1094 | |
| 1095 | static bfd_boolean |
| 1096 | constructor_callback (struct bfd_link_info *info, |
| 1097 | bfd_boolean constructor, |
| 1098 | const char *name, |
| 1099 | bfd *abfd, |
| 1100 | asection *section, |
| 1101 | bfd_vma value) |
| 1102 | { |
| 1103 | char *s; |
| 1104 | struct bfd_link_hash_entry *h; |
| 1105 | char set_name[1 + sizeof "__CTOR_LIST__"]; |
| 1106 | |
| 1107 | if (config.warn_constructors) |
| 1108 | einfo (_("%P: warning: global constructor %s used\n"), name); |
| 1109 | |
| 1110 | if (! config.build_constructors) |
| 1111 | return TRUE; |
| 1112 | |
| 1113 | /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a |
| 1114 | useful error message. */ |
| 1115 | if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL |
| 1116 | && (link_info.relocatable |
| 1117 | || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL)) |
| 1118 | einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n")); |
| 1119 | |
| 1120 | s = set_name; |
| 1121 | if (bfd_get_symbol_leading_char (abfd) != '\0') |
| 1122 | *s++ = bfd_get_symbol_leading_char (abfd); |
| 1123 | if (constructor) |
| 1124 | strcpy (s, "__CTOR_LIST__"); |
| 1125 | else |
| 1126 | strcpy (s, "__DTOR_LIST__"); |
| 1127 | |
| 1128 | h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE); |
| 1129 | if (h == (struct bfd_link_hash_entry *) NULL) |
| 1130 | einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n")); |
| 1131 | if (h->type == bfd_link_hash_new) |
| 1132 | { |
| 1133 | h->type = bfd_link_hash_undefined; |
| 1134 | h->u.undef.abfd = abfd; |
| 1135 | /* We don't call bfd_link_add_undef to add this to the list of |
| 1136 | undefined symbols because we are going to define it |
| 1137 | ourselves. */ |
| 1138 | } |
| 1139 | |
| 1140 | ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value); |
| 1141 | return TRUE; |
| 1142 | } |
| 1143 | |
| 1144 | /* A structure used by warning_callback to pass information through |
| 1145 | bfd_map_over_sections. */ |
| 1146 | |
| 1147 | struct warning_callback_info |
| 1148 | { |
| 1149 | bfd_boolean found; |
| 1150 | const char *warning; |
| 1151 | const char *symbol; |
| 1152 | asymbol **asymbols; |
| 1153 | }; |
| 1154 | |
| 1155 | /* This is called when there is a reference to a warning symbol. */ |
| 1156 | |
| 1157 | static bfd_boolean |
| 1158 | warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 1159 | const char *warning, |
| 1160 | const char *symbol, |
| 1161 | bfd *abfd, |
| 1162 | asection *section, |
| 1163 | bfd_vma address) |
| 1164 | { |
| 1165 | /* This is a hack to support warn_multiple_gp. FIXME: This should |
| 1166 | have a cleaner interface, but what? */ |
| 1167 | if (! config.warn_multiple_gp |
| 1168 | && strcmp (warning, "using multiple gp values") == 0) |
| 1169 | return TRUE; |
| 1170 | |
| 1171 | if (section != NULL) |
| 1172 | einfo ("%C: %s\n", abfd, section, address, warning); |
| 1173 | else if (abfd == NULL) |
| 1174 | einfo ("%P: %s\n", warning); |
| 1175 | else if (symbol == NULL) |
| 1176 | einfo ("%B: %s\n", abfd, warning); |
| 1177 | else |
| 1178 | { |
| 1179 | lang_input_statement_type *entry; |
| 1180 | asymbol **asymbols; |
| 1181 | struct warning_callback_info info; |
| 1182 | |
| 1183 | /* Look through the relocs to see if we can find a plausible |
| 1184 | address. */ |
| 1185 | entry = (lang_input_statement_type *) abfd->usrdata; |
| 1186 | if (entry != NULL && entry->asymbols != NULL) |
| 1187 | asymbols = entry->asymbols; |
| 1188 | else |
| 1189 | { |
| 1190 | long symsize; |
| 1191 | long symbol_count; |
| 1192 | |
| 1193 | symsize = bfd_get_symtab_upper_bound (abfd); |
| 1194 | if (symsize < 0) |
| 1195 | einfo (_("%B%F: could not read symbols: %E\n"), abfd); |
| 1196 | asymbols = xmalloc (symsize); |
| 1197 | symbol_count = bfd_canonicalize_symtab (abfd, asymbols); |
| 1198 | if (symbol_count < 0) |
| 1199 | einfo (_("%B%F: could not read symbols: %E\n"), abfd); |
| 1200 | if (entry != NULL) |
| 1201 | { |
| 1202 | entry->asymbols = asymbols; |
| 1203 | entry->symbol_count = symbol_count; |
| 1204 | } |
| 1205 | } |
| 1206 | |
| 1207 | info.found = FALSE; |
| 1208 | info.warning = warning; |
| 1209 | info.symbol = symbol; |
| 1210 | info.asymbols = asymbols; |
| 1211 | bfd_map_over_sections (abfd, warning_find_reloc, &info); |
| 1212 | |
| 1213 | if (! info.found) |
| 1214 | einfo ("%B: %s\n", abfd, warning); |
| 1215 | |
| 1216 | if (entry == NULL) |
| 1217 | free (asymbols); |
| 1218 | } |
| 1219 | |
| 1220 | return TRUE; |
| 1221 | } |
| 1222 | |
| 1223 | /* This is called by warning_callback for each section. It checks the |
| 1224 | relocs of the section to see if it can find a reference to the |
| 1225 | symbol which triggered the warning. If it can, it uses the reloc |
| 1226 | to give an error message with a file and line number. */ |
| 1227 | |
| 1228 | static void |
| 1229 | warning_find_reloc (bfd *abfd, asection *sec, void *iarg) |
| 1230 | { |
| 1231 | struct warning_callback_info *info = iarg; |
| 1232 | long relsize; |
| 1233 | arelent **relpp; |
| 1234 | long relcount; |
| 1235 | arelent **p, **pend; |
| 1236 | |
| 1237 | if (info->found) |
| 1238 | return; |
| 1239 | |
| 1240 | relsize = bfd_get_reloc_upper_bound (abfd, sec); |
| 1241 | if (relsize < 0) |
| 1242 | einfo (_("%B%F: could not read relocs: %E\n"), abfd); |
| 1243 | if (relsize == 0) |
| 1244 | return; |
| 1245 | |
| 1246 | relpp = xmalloc (relsize); |
| 1247 | relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols); |
| 1248 | if (relcount < 0) |
| 1249 | einfo (_("%B%F: could not read relocs: %E\n"), abfd); |
| 1250 | |
| 1251 | p = relpp; |
| 1252 | pend = p + relcount; |
| 1253 | for (; p < pend && *p != NULL; p++) |
| 1254 | { |
| 1255 | arelent *q = *p; |
| 1256 | |
| 1257 | if (q->sym_ptr_ptr != NULL |
| 1258 | && *q->sym_ptr_ptr != NULL |
| 1259 | && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0) |
| 1260 | { |
| 1261 | /* We found a reloc for the symbol we are looking for. */ |
| 1262 | einfo ("%C: %s\n", abfd, sec, q->address, info->warning); |
| 1263 | info->found = TRUE; |
| 1264 | break; |
| 1265 | } |
| 1266 | } |
| 1267 | |
| 1268 | free (relpp); |
| 1269 | } |
| 1270 | |
| 1271 | /* This is called when an undefined symbol is found. */ |
| 1272 | |
| 1273 | static bfd_boolean |
| 1274 | undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 1275 | const char *name, |
| 1276 | bfd *abfd, |
| 1277 | asection *section, |
| 1278 | bfd_vma address, |
| 1279 | bfd_boolean error) |
| 1280 | { |
| 1281 | static char *error_name; |
| 1282 | static unsigned int error_count; |
| 1283 | |
| 1284 | #define MAX_ERRORS_IN_A_ROW 5 |
| 1285 | |
| 1286 | if (config.warn_once) |
| 1287 | { |
| 1288 | static struct bfd_hash_table *hash; |
| 1289 | |
| 1290 | /* Only warn once about a particular undefined symbol. */ |
| 1291 | if (hash == NULL) |
| 1292 | { |
| 1293 | hash = xmalloc (sizeof (struct bfd_hash_table)); |
| 1294 | if (! bfd_hash_table_init (hash, bfd_hash_newfunc)) |
| 1295 | einfo (_("%F%P: bfd_hash_table_init failed: %E\n")); |
| 1296 | } |
| 1297 | |
| 1298 | if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL) |
| 1299 | return TRUE; |
| 1300 | |
| 1301 | if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL) |
| 1302 | einfo (_("%F%P: bfd_hash_lookup failed: %E\n")); |
| 1303 | } |
| 1304 | |
| 1305 | /* We never print more than a reasonable number of errors in a row |
| 1306 | for a single symbol. */ |
| 1307 | if (error_name != NULL |
| 1308 | && strcmp (name, error_name) == 0) |
| 1309 | ++error_count; |
| 1310 | else |
| 1311 | { |
| 1312 | error_count = 0; |
| 1313 | if (error_name != NULL) |
| 1314 | free (error_name); |
| 1315 | error_name = xstrdup (name); |
| 1316 | } |
| 1317 | |
| 1318 | if (section != NULL) |
| 1319 | { |
| 1320 | if (error_count < MAX_ERRORS_IN_A_ROW) |
| 1321 | { |
| 1322 | if (error) |
| 1323 | einfo (_("%X%C: undefined reference to `%T'\n"), |
| 1324 | abfd, section, address, name); |
| 1325 | else |
| 1326 | einfo (_("%C: warning: undefined reference to `%T'\n"), |
| 1327 | abfd, section, address, name); |
| 1328 | } |
| 1329 | else if (error_count == MAX_ERRORS_IN_A_ROW) |
| 1330 | { |
| 1331 | if (error) |
| 1332 | einfo (_("%X%D: more undefined references to `%T' follow\n"), |
| 1333 | abfd, section, address, name); |
| 1334 | else |
| 1335 | einfo (_("%D: warning: more undefined references to `%T' follow\n"), |
| 1336 | abfd, section, address, name); |
| 1337 | } |
| 1338 | else if (error) |
| 1339 | einfo ("%X"); |
| 1340 | } |
| 1341 | else |
| 1342 | { |
| 1343 | if (error_count < MAX_ERRORS_IN_A_ROW) |
| 1344 | { |
| 1345 | if (error) |
| 1346 | einfo (_("%X%B: undefined reference to `%T'\n"), |
| 1347 | abfd, name); |
| 1348 | else |
| 1349 | einfo (_("%B: warning: undefined reference to `%T'\n"), |
| 1350 | abfd, name); |
| 1351 | } |
| 1352 | else if (error_count == MAX_ERRORS_IN_A_ROW) |
| 1353 | { |
| 1354 | if (error) |
| 1355 | einfo (_("%X%B: more undefined references to `%T' follow\n"), |
| 1356 | abfd, name); |
| 1357 | else |
| 1358 | einfo (_("%B: warning: more undefined references to `%T' follow\n"), |
| 1359 | abfd, name); |
| 1360 | } |
| 1361 | else if (error) |
| 1362 | einfo ("%X"); |
| 1363 | } |
| 1364 | |
| 1365 | return TRUE; |
| 1366 | } |
| 1367 | |
| 1368 | /* Counter to limit the number of relocation overflow error messages |
| 1369 | to print. Errors are printed as it is decremented. When it's |
| 1370 | called and the counter is zero, a final message is printed |
| 1371 | indicating more relocations were omitted. When it gets to -1, no |
| 1372 | such errors are printed. If it's initially set to a value less |
| 1373 | than -1, all such errors will be printed (--verbose does this). */ |
| 1374 | |
| 1375 | int overflow_cutoff_limit = 10; |
| 1376 | |
| 1377 | /* This is called when a reloc overflows. */ |
| 1378 | |
| 1379 | static bfd_boolean |
| 1380 | reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 1381 | const char *name, |
| 1382 | const char *reloc_name, |
| 1383 | bfd_vma addend, |
| 1384 | bfd *abfd, |
| 1385 | asection *section, |
| 1386 | bfd_vma address) |
| 1387 | { |
| 1388 | if (overflow_cutoff_limit == -1) |
| 1389 | return TRUE; |
| 1390 | |
| 1391 | if (abfd == NULL) |
| 1392 | einfo (_("%P%X: generated")); |
| 1393 | else |
| 1394 | einfo ("%X%C:", abfd, section, address); |
| 1395 | |
| 1396 | if (overflow_cutoff_limit >= 0 |
| 1397 | && overflow_cutoff_limit-- == 0) |
| 1398 | { |
| 1399 | einfo (_(" additional relocation overflows omitted from the output\n")); |
| 1400 | return TRUE; |
| 1401 | } |
| 1402 | |
| 1403 | einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name); |
| 1404 | if (addend != 0) |
| 1405 | einfo ("+%v", addend); |
| 1406 | einfo ("\n"); |
| 1407 | return TRUE; |
| 1408 | } |
| 1409 | |
| 1410 | /* This is called when a dangerous relocation is made. */ |
| 1411 | |
| 1412 | static bfd_boolean |
| 1413 | reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 1414 | const char *message, |
| 1415 | bfd *abfd, |
| 1416 | asection *section, |
| 1417 | bfd_vma address) |
| 1418 | { |
| 1419 | if (abfd == NULL) |
| 1420 | einfo (_("%P%X: generated")); |
| 1421 | else |
| 1422 | einfo ("%X%C:", abfd, section, address); |
| 1423 | einfo (_("dangerous relocation: %s\n"), message); |
| 1424 | return TRUE; |
| 1425 | } |
| 1426 | |
| 1427 | /* This is called when a reloc is being generated attached to a symbol |
| 1428 | that is not being output. */ |
| 1429 | |
| 1430 | static bfd_boolean |
| 1431 | unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 1432 | const char *name, |
| 1433 | bfd *abfd, |
| 1434 | asection *section, |
| 1435 | bfd_vma address) |
| 1436 | { |
| 1437 | if (abfd == NULL) |
| 1438 | einfo (_("%P%X: generated")); |
| 1439 | else |
| 1440 | einfo ("%X%C:", abfd, section, address); |
| 1441 | einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name); |
| 1442 | return TRUE; |
| 1443 | } |
| 1444 | |
| 1445 | /* This is called if link_info.notice_all is set, or when a symbol in |
| 1446 | link_info.notice_hash is found. Symbols are put in notice_hash |
| 1447 | using the -y option. */ |
| 1448 | |
| 1449 | static bfd_boolean |
| 1450 | notice (struct bfd_link_info *info, |
| 1451 | const char *name, |
| 1452 | bfd *abfd, |
| 1453 | asection *section, |
| 1454 | bfd_vma value) |
| 1455 | { |
| 1456 | if (! info->notice_all |
| 1457 | || (info->notice_hash != NULL |
| 1458 | && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)) |
| 1459 | { |
| 1460 | if (bfd_is_und_section (section)) |
| 1461 | einfo ("%B: reference to %s\n", abfd, name); |
| 1462 | else |
| 1463 | einfo ("%B: definition of %s\n", abfd, name); |
| 1464 | } |
| 1465 | |
| 1466 | if (command_line.cref || nocrossref_list != NULL) |
| 1467 | add_cref (name, abfd, section, value); |
| 1468 | |
| 1469 | return TRUE; |
| 1470 | } |