| 1 | /* Main program of GNU linker. |
| 2 | Copyright (C) 1991, 92, 93, 94 Free Software Foundation, Inc. |
| 3 | Written by Steve Chamberlain steve@cygnus.com |
| 4 | |
| 5 | This file is part of GLD, the Gnu Linker. |
| 6 | |
| 7 | GLD 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 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GLD 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 GLD; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | |
| 22 | #include "bfd.h" |
| 23 | #include "sysdep.h" |
| 24 | #include <stdio.h> |
| 25 | #include "libiberty.h" |
| 26 | #include "progress.h" |
| 27 | #include "bfdlink.h" |
| 28 | |
| 29 | #include "config.h" |
| 30 | #include "ld.h" |
| 31 | #include "ldmain.h" |
| 32 | #include "ldmisc.h" |
| 33 | #include "ldwrite.h" |
| 34 | #include "ldgram.h" |
| 35 | #include "ldexp.h" |
| 36 | #include "ldlang.h" |
| 37 | #include "ldemul.h" |
| 38 | #include "ldlex.h" |
| 39 | #include "ldfile.h" |
| 40 | #include "ldctor.h" |
| 41 | |
| 42 | /* Somewhere above, sys/stat.h got included . . . . */ |
| 43 | #if !defined(S_ISDIR) && defined(S_IFDIR) |
| 44 | #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) |
| 45 | #endif |
| 46 | |
| 47 | #include <string.h> |
| 48 | |
| 49 | /* Use sbrk() except on specific OS types */ |
| 50 | #if !defined(__amigados__) && !defined(WINDOWS_NT) |
| 51 | #define HAVE_SBRK |
| 52 | #endif |
| 53 | |
| 54 | static char *get_emulation PARAMS ((int, char **)); |
| 55 | static void set_scripts_dir PARAMS ((void)); |
| 56 | |
| 57 | /* EXPORTS */ |
| 58 | |
| 59 | char *default_target; |
| 60 | const char *output_filename = "a.out"; |
| 61 | |
| 62 | /* Name this program was invoked by. */ |
| 63 | char *program_name; |
| 64 | |
| 65 | /* The file that we're creating */ |
| 66 | bfd *output_bfd = 0; |
| 67 | |
| 68 | /* Set by -G argument, for MIPS ECOFF target. */ |
| 69 | int g_switch_value = 8; |
| 70 | |
| 71 | /* Nonzero means print names of input files as processed. */ |
| 72 | boolean trace_files; |
| 73 | |
| 74 | /* Nonzero means same, but note open failures, too. */ |
| 75 | boolean trace_file_tries; |
| 76 | |
| 77 | /* Nonzero means version number was printed, so exit successfully |
| 78 | instead of complaining if no input files are given. */ |
| 79 | boolean version_printed; |
| 80 | |
| 81 | /* Nonzero means link in every member of an archive. */ |
| 82 | boolean whole_archive; |
| 83 | |
| 84 | args_type command_line; |
| 85 | |
| 86 | ld_config_type config; |
| 87 | |
| 88 | static boolean check_for_scripts_dir PARAMS ((char *dir)); |
| 89 | static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *, |
| 90 | const char *)); |
| 91 | static boolean multiple_definition PARAMS ((struct bfd_link_info *, |
| 92 | const char *, |
| 93 | bfd *, asection *, bfd_vma, |
| 94 | bfd *, asection *, bfd_vma)); |
| 95 | static boolean multiple_common PARAMS ((struct bfd_link_info *, |
| 96 | const char *, bfd *, |
| 97 | enum bfd_link_hash_type, bfd_vma, |
| 98 | bfd *, enum bfd_link_hash_type, |
| 99 | bfd_vma)); |
| 100 | static boolean add_to_set PARAMS ((struct bfd_link_info *, |
| 101 | struct bfd_link_hash_entry *, |
| 102 | bfd_reloc_code_real_type, |
| 103 | bfd *, asection *, bfd_vma)); |
| 104 | static boolean constructor_callback PARAMS ((struct bfd_link_info *, |
| 105 | boolean constructor, |
| 106 | const char *name, |
| 107 | bfd *, asection *, bfd_vma)); |
| 108 | static boolean warning_callback PARAMS ((struct bfd_link_info *, |
| 109 | const char *)); |
| 110 | static boolean undefined_symbol PARAMS ((struct bfd_link_info *, |
| 111 | const char *, bfd *, |
| 112 | asection *, bfd_vma)); |
| 113 | static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *, |
| 114 | const char *, bfd_vma, |
| 115 | bfd *, asection *, bfd_vma)); |
| 116 | static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *, |
| 117 | bfd *, asection *, bfd_vma)); |
| 118 | static boolean unattached_reloc PARAMS ((struct bfd_link_info *, |
| 119 | const char *, bfd *, asection *, |
| 120 | bfd_vma)); |
| 121 | static boolean notice_ysym PARAMS ((struct bfd_link_info *, const char *, |
| 122 | bfd *, asection *, bfd_vma)); |
| 123 | |
| 124 | static struct bfd_link_callbacks link_callbacks = |
| 125 | { |
| 126 | add_archive_element, |
| 127 | multiple_definition, |
| 128 | multiple_common, |
| 129 | add_to_set, |
| 130 | constructor_callback, |
| 131 | warning_callback, |
| 132 | undefined_symbol, |
| 133 | reloc_overflow, |
| 134 | reloc_dangerous, |
| 135 | unattached_reloc, |
| 136 | notice_ysym |
| 137 | }; |
| 138 | |
| 139 | struct bfd_link_info link_info; |
| 140 | \f |
| 141 | static void |
| 142 | remove_output () |
| 143 | { |
| 144 | if (output_filename) |
| 145 | { |
| 146 | if (output_bfd && output_bfd->iostream) |
| 147 | fclose((FILE *)(output_bfd->iostream)); |
| 148 | if (delete_output_file_on_failure) |
| 149 | unlink (output_filename); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | int |
| 154 | main (argc, argv) |
| 155 | int argc; |
| 156 | char **argv; |
| 157 | { |
| 158 | char *emulation; |
| 159 | long start_time = get_run_time (); |
| 160 | |
| 161 | program_name = argv[0]; |
| 162 | xmalloc_set_program_name (program_name); |
| 163 | |
| 164 | START_PROGRESS (program_name, 0); |
| 165 | |
| 166 | bfd_init (); |
| 167 | |
| 168 | xatexit (remove_output); |
| 169 | |
| 170 | /* Initialize the data about options. */ |
| 171 | trace_files = trace_file_tries = version_printed = false; |
| 172 | whole_archive = false; |
| 173 | config.traditional_format = false; |
| 174 | config.build_constructors = true; |
| 175 | config.dynamic_link = false; |
| 176 | command_line.force_common_definition = false; |
| 177 | command_line.interpreter = NULL; |
| 178 | command_line.rpath = NULL; |
| 179 | |
| 180 | link_info.callbacks = &link_callbacks; |
| 181 | link_info.relocateable = false; |
| 182 | link_info.shared = false; |
| 183 | link_info.strip = strip_none; |
| 184 | link_info.discard = discard_none; |
| 185 | link_info.lprefix_len = 1; |
| 186 | link_info.lprefix = "L"; |
| 187 | link_info.keep_memory = true; |
| 188 | link_info.input_bfds = NULL; |
| 189 | link_info.create_object_symbols_section = NULL; |
| 190 | link_info.hash = NULL; |
| 191 | link_info.keep_hash = NULL; |
| 192 | link_info.notice_hash = NULL; |
| 193 | link_info.subsystem = console; |
| 194 | link_info.stack_heap_parameters.stack_defined = false; |
| 195 | link_info.stack_heap_parameters.heap_defined = false; |
| 196 | link_info.stack_heap_parameters.stack_reserve = 0; |
| 197 | link_info.stack_heap_parameters.stack_commit = 0; |
| 198 | link_info.stack_heap_parameters.heap_reserve = 0; |
| 199 | link_info.stack_heap_parameters.heap_commit = 0; |
| 200 | |
| 201 | |
| 202 | ldfile_add_arch (""); |
| 203 | |
| 204 | config.make_executable = true; |
| 205 | force_make_executable = false; |
| 206 | config.magic_demand_paged = true; |
| 207 | config.text_read_only = true; |
| 208 | config.make_executable = true; |
| 209 | |
| 210 | emulation = get_emulation (argc, argv); |
| 211 | ldemul_choose_mode (emulation); |
| 212 | default_target = ldemul_choose_target (); |
| 213 | lang_init (); |
| 214 | ldemul_before_parse (); |
| 215 | lang_has_input_file = false; |
| 216 | parse_args (argc, argv); |
| 217 | |
| 218 | if (link_info.relocateable) |
| 219 | { |
| 220 | if (command_line.relax) |
| 221 | einfo ("%P%F: -relax and -r may not be used together\n"); |
| 222 | if (config.dynamic_link) |
| 223 | einfo ("%P%F: -r and -call_shared may not be used together\n"); |
| 224 | if (link_info.shared) |
| 225 | einfo ("%P%F: -r and -shared may not be used together\n"); |
| 226 | } |
| 227 | |
| 228 | /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I |
| 229 | don't see how else this can be handled, since in this case we |
| 230 | must preserve all externally visible symbols. */ |
| 231 | if (link_info.relocateable && link_info.strip == strip_all) |
| 232 | { |
| 233 | link_info.strip = strip_debugger; |
| 234 | if (link_info.discard == discard_none) |
| 235 | link_info.discard = discard_all; |
| 236 | } |
| 237 | |
| 238 | /* This essentially adds another -L directory so this must be done after |
| 239 | the -L's in argv have been processed. */ |
| 240 | set_scripts_dir (); |
| 241 | |
| 242 | if (had_script == false) |
| 243 | { |
| 244 | /* Read the emulation's appropriate default script. */ |
| 245 | int isfile; |
| 246 | char *s = ldemul_get_script (&isfile); |
| 247 | |
| 248 | if (isfile) |
| 249 | ldfile_open_command_file (s); |
| 250 | else |
| 251 | { |
| 252 | if (trace_file_tries) |
| 253 | { |
| 254 | info_msg ("using internal linker script:\n"); |
| 255 | info_msg ("==================================================\n"); |
| 256 | info_msg (s); |
| 257 | info_msg ("\n==================================================\n"); |
| 258 | } |
| 259 | lex_redirect (s); |
| 260 | } |
| 261 | parser_input = input_script; |
| 262 | yyparse (); |
| 263 | } |
| 264 | |
| 265 | lang_final (); |
| 266 | |
| 267 | if (lang_has_input_file == false) |
| 268 | { |
| 269 | if (version_printed) |
| 270 | xexit (0); |
| 271 | einfo ("%P%F: no input files\n"); |
| 272 | } |
| 273 | |
| 274 | if (trace_files) |
| 275 | { |
| 276 | info_msg ("%P: mode %s\n", emulation); |
| 277 | } |
| 278 | |
| 279 | ldemul_after_parse (); |
| 280 | |
| 281 | |
| 282 | if (config.map_filename) |
| 283 | { |
| 284 | if (strcmp (config.map_filename, "-") == 0) |
| 285 | { |
| 286 | config.map_file = stdout; |
| 287 | } |
| 288 | else |
| 289 | { |
| 290 | config.map_file = fopen (config.map_filename, FOPEN_WT); |
| 291 | if (config.map_file == (FILE *) NULL) |
| 292 | { |
| 293 | bfd_set_error (bfd_error_system_call); |
| 294 | einfo ("%P%F: cannot open map file %s: %E\n", |
| 295 | config.map_filename); |
| 296 | } |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | |
| 301 | lang_process (); |
| 302 | |
| 303 | /* Print error messages for any missing symbols, for any warning |
| 304 | symbols, and possibly multiple definitions */ |
| 305 | |
| 306 | |
| 307 | if (config.text_read_only) |
| 308 | { |
| 309 | /* Look for a text section and mark the readonly attribute in it */ |
| 310 | asection *found = bfd_get_section_by_name (output_bfd, ".text"); |
| 311 | |
| 312 | if (found != (asection *) NULL) |
| 313 | { |
| 314 | found->flags |= SEC_READONLY; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | if (link_info.relocateable) |
| 319 | output_bfd->flags &= ~EXEC_P; |
| 320 | else |
| 321 | output_bfd->flags |= EXEC_P; |
| 322 | |
| 323 | ldwrite (); |
| 324 | |
| 325 | /* Even if we're producing relocateable output, some non-fatal errors should |
| 326 | be reported in the exit status. (What non-fatal errors, if any, do we |
| 327 | want to ignore for relocateable output?) */ |
| 328 | |
| 329 | if (config.make_executable == false && force_make_executable == false) |
| 330 | { |
| 331 | if (trace_files == true) |
| 332 | { |
| 333 | einfo ("%P: link errors found, deleting executable `%s'\n", |
| 334 | output_filename); |
| 335 | } |
| 336 | |
| 337 | if (output_bfd->iostream) |
| 338 | fclose ((FILE *) (output_bfd->iostream)); |
| 339 | |
| 340 | unlink (output_filename); |
| 341 | xexit (1); |
| 342 | } |
| 343 | else |
| 344 | { |
| 345 | if (! bfd_close (output_bfd)) |
| 346 | einfo ("%F%B: final close failed: %E\n", output_bfd); |
| 347 | } |
| 348 | |
| 349 | END_PROGRESS (program_name); |
| 350 | |
| 351 | if (config.stats) |
| 352 | { |
| 353 | extern char **environ; |
| 354 | #ifdef HAVE_SBRK |
| 355 | char *lim = (char *) sbrk (0); |
| 356 | #endif |
| 357 | long run_time = get_run_time () - start_time; |
| 358 | |
| 359 | fprintf (stderr, "%s: total time in link: %ld.%06ld\n", |
| 360 | program_name, run_time / 1000000, run_time % 1000000); |
| 361 | #ifdef HAVE_SBRK |
| 362 | fprintf (stderr, "%s: data size %ld\n", program_name, |
| 363 | (long) (lim - (char *) &environ)); |
| 364 | #endif |
| 365 | } |
| 366 | |
| 367 | /* Prevent remove_output from doing anything, after a successful link. */ |
| 368 | output_filename = NULL; |
| 369 | |
| 370 | xexit (0); |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | /* We need to find any explicitly given emulation in order to initialize the |
| 375 | state that's needed by the lex&yacc argument parser (parse_args). */ |
| 376 | |
| 377 | static char * |
| 378 | get_emulation (argc, argv) |
| 379 | int argc; |
| 380 | char **argv; |
| 381 | { |
| 382 | char *emulation; |
| 383 | int i; |
| 384 | |
| 385 | emulation = (char *) getenv (EMULATION_ENVIRON); |
| 386 | if (emulation == NULL) |
| 387 | emulation = DEFAULT_EMULATION; |
| 388 | |
| 389 | for (i = 1; i < argc; i++) |
| 390 | { |
| 391 | if (!strncmp (argv[i], "-m", 2)) |
| 392 | { |
| 393 | if (argv[i][2] == '\0') |
| 394 | { |
| 395 | /* -m EMUL */ |
| 396 | if (i < argc - 1) |
| 397 | { |
| 398 | emulation = argv[i + 1]; |
| 399 | i++; |
| 400 | } |
| 401 | else |
| 402 | { |
| 403 | einfo("%P%F: missing argument to -m\n"); |
| 404 | } |
| 405 | } |
| 406 | else if (strcmp (argv[i], "-mips1") == 0 |
| 407 | || strcmp (argv[i], "-mips2") == 0 |
| 408 | || strcmp (argv[i], "-mips3") == 0) |
| 409 | { |
| 410 | /* FIXME: The arguments -mips1, -mips2 and -mips3 are |
| 411 | passed to the linker by some MIPS compilers. They |
| 412 | generally tell the linker to use a slightly different |
| 413 | library path. Perhaps someday these should be |
| 414 | implemented as emulations; until then, we just ignore |
| 415 | the arguments and hope that nobody ever creates |
| 416 | emulations named ips1, ips2 or ips3. */ |
| 417 | } |
| 418 | else if (strcmp (argv[i], "-m486") == 0) |
| 419 | { |
| 420 | /* FIXME: The argument -m486 is passed to the linker on |
| 421 | some Linux systems. Hope that nobody creates an |
| 422 | emulation named 486. */ |
| 423 | } |
| 424 | else |
| 425 | { |
| 426 | /* -mEMUL */ |
| 427 | emulation = &argv[i][2]; |
| 428 | } |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | return emulation; |
| 433 | } |
| 434 | |
| 435 | /* If directory DIR contains an "ldscripts" subdirectory, |
| 436 | add DIR to the library search path and return true, |
| 437 | else return false. */ |
| 438 | |
| 439 | static boolean |
| 440 | check_for_scripts_dir (dir) |
| 441 | char *dir; |
| 442 | { |
| 443 | size_t dirlen; |
| 444 | char *buf; |
| 445 | struct stat s; |
| 446 | boolean res; |
| 447 | |
| 448 | dirlen = strlen (dir); |
| 449 | /* sizeof counts the terminating NUL. */ |
| 450 | buf = (char *) xmalloc (dirlen + sizeof("/ldscripts")); |
| 451 | sprintf (buf, "%s/ldscripts", dir); |
| 452 | |
| 453 | res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode); |
| 454 | free (buf); |
| 455 | if (res) |
| 456 | ldfile_add_library_path (dir, false); |
| 457 | return res; |
| 458 | } |
| 459 | |
| 460 | /* Set the default directory for finding script files. |
| 461 | Libraries will be searched for here too, but that's ok. |
| 462 | We look for the "ldscripts" directory in: |
| 463 | |
| 464 | SCRIPTDIR (passed from Makefile) |
| 465 | the dir where this program is (for using it from the build tree) |
| 466 | the dir where this program is/../lib (for installing the tool suite elsewhere) */ |
| 467 | |
| 468 | static void |
| 469 | set_scripts_dir () |
| 470 | { |
| 471 | char *end, *dir; |
| 472 | size_t dirlen; |
| 473 | |
| 474 | if (check_for_scripts_dir (SCRIPTDIR)) |
| 475 | return; /* We've been installed normally. */ |
| 476 | |
| 477 | /* Look for "ldscripts" in the dir where our binary is. */ |
| 478 | end = strrchr (program_name, '/'); |
| 479 | if (end) |
| 480 | { |
| 481 | dirlen = end - program_name; |
| 482 | /* Make a copy of program_name in dir. |
| 483 | Leave room for later "/../lib". */ |
| 484 | dir = (char *) xmalloc (dirlen + 8); |
| 485 | strncpy (dir, program_name, dirlen); |
| 486 | dir[dirlen] = '\0'; |
| 487 | } |
| 488 | else |
| 489 | { |
| 490 | dirlen = 1; |
| 491 | dir = (char *) xmalloc (dirlen + 8); |
| 492 | strcpy (dir, "."); |
| 493 | } |
| 494 | |
| 495 | if (check_for_scripts_dir (dir)) |
| 496 | return; /* Don't free dir. */ |
| 497 | |
| 498 | /* Look for "ldscripts" in <the dir where our binary is>/../lib. */ |
| 499 | strcpy (dir + dirlen, "/../lib"); |
| 500 | if (check_for_scripts_dir (dir)) |
| 501 | return; |
| 502 | |
| 503 | free (dir); /* Well, we tried. */ |
| 504 | } |
| 505 | |
| 506 | void |
| 507 | add_ysym (name) |
| 508 | const char *name; |
| 509 | { |
| 510 | if (link_info.notice_hash == (struct bfd_hash_table *) NULL) |
| 511 | { |
| 512 | link_info.notice_hash = ((struct bfd_hash_table *) |
| 513 | xmalloc (sizeof (struct bfd_hash_table))); |
| 514 | if (! bfd_hash_table_init_n (link_info.notice_hash, |
| 515 | bfd_hash_newfunc, |
| 516 | 61)) |
| 517 | einfo ("%P%F: bfd_hash_table_init failed: %E\n"); |
| 518 | } |
| 519 | |
| 520 | if (bfd_hash_lookup (link_info.notice_hash, name, true, true) |
| 521 | == (struct bfd_hash_entry *) NULL) |
| 522 | einfo ("%P%F: bfd_hash_lookup failed: %E\n"); |
| 523 | } |
| 524 | |
| 525 | /* Handle the -retain-symbols-file option. */ |
| 526 | |
| 527 | void |
| 528 | add_keepsyms_file (filename) |
| 529 | const char *filename; |
| 530 | { |
| 531 | FILE *file; |
| 532 | char *buf; |
| 533 | size_t bufsize; |
| 534 | int c; |
| 535 | |
| 536 | if (link_info.strip == strip_some) |
| 537 | einfo ("%X%P: error: duplicate retain-symbols-file\n"); |
| 538 | |
| 539 | file = fopen (filename, "r"); |
| 540 | if (file == (FILE *) NULL) |
| 541 | { |
| 542 | bfd_set_error (bfd_error_system_call); |
| 543 | einfo ("%X%P: %s: %E", filename); |
| 544 | return; |
| 545 | } |
| 546 | |
| 547 | link_info.keep_hash = ((struct bfd_hash_table *) |
| 548 | xmalloc (sizeof (struct bfd_hash_table))); |
| 549 | if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc)) |
| 550 | einfo ("%P%F: bfd_hash_table_init failed: %E\n"); |
| 551 | |
| 552 | bufsize = 100; |
| 553 | buf = (char *) xmalloc (bufsize); |
| 554 | |
| 555 | c = getc (file); |
| 556 | while (c != EOF) |
| 557 | { |
| 558 | while (isspace (c)) |
| 559 | c = getc (file); |
| 560 | |
| 561 | if (c != EOF) |
| 562 | { |
| 563 | size_t len = 0; |
| 564 | |
| 565 | while (! isspace (c) && c != EOF) |
| 566 | { |
| 567 | buf[len] = c; |
| 568 | ++len; |
| 569 | if (len >= bufsize) |
| 570 | { |
| 571 | bufsize *= 2; |
| 572 | buf = xrealloc (buf, bufsize); |
| 573 | } |
| 574 | c = getc (file); |
| 575 | } |
| 576 | |
| 577 | buf[len] = '\0'; |
| 578 | |
| 579 | if (bfd_hash_lookup (link_info.keep_hash, buf, true, true) |
| 580 | == (struct bfd_hash_entry *) NULL) |
| 581 | einfo ("%P%F: bfd_hash_lookup for insertion failed: %E"); |
| 582 | } |
| 583 | } |
| 584 | |
| 585 | if (link_info.strip != strip_none) |
| 586 | einfo ("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"); |
| 587 | |
| 588 | link_info.strip = strip_some; |
| 589 | } |
| 590 | \f |
| 591 | /* Callbacks from the BFD linker routines. */ |
| 592 | |
| 593 | /* This is called when BFD has decided to include an archive member in |
| 594 | a link. */ |
| 595 | |
| 596 | /*ARGSUSED*/ |
| 597 | static boolean |
| 598 | add_archive_element (info, abfd, name) |
| 599 | struct bfd_link_info *info; |
| 600 | bfd *abfd; |
| 601 | const char *name; |
| 602 | { |
| 603 | lang_input_statement_type *input; |
| 604 | |
| 605 | input = ((lang_input_statement_type *) |
| 606 | xmalloc ((bfd_size_type) sizeof (lang_input_statement_type))); |
| 607 | input->filename = abfd->filename; |
| 608 | input->local_sym_name = abfd->filename; |
| 609 | input->the_bfd = abfd; |
| 610 | input->asymbols = NULL; |
| 611 | input->next = NULL; |
| 612 | input->just_syms_flag = false; |
| 613 | input->loaded = false; |
| 614 | input->search_dirs_flag = false; |
| 615 | |
| 616 | /* FIXME: The following fields are not set: header.next, |
| 617 | header.type, closed, passive_position, symbol_count, |
| 618 | next_real_file, is_archive, target, real, common_section, |
| 619 | common_output_section, complained. This bit of code is from the |
| 620 | old decode_library_subfile function. I don't know whether any of |
| 621 | those fields matters. */ |
| 622 | |
| 623 | ldlang_add_file (input); |
| 624 | |
| 625 | if (config.map_file != (FILE *) NULL) |
| 626 | minfo ("%s needed due to %T\n", abfd->filename, name); |
| 627 | |
| 628 | if (trace_files || trace_file_tries) |
| 629 | info_msg ("%I\n", input); |
| 630 | |
| 631 | return true; |
| 632 | } |
| 633 | |
| 634 | /* This is called when BFD has discovered a symbol which is defined |
| 635 | multiple times. */ |
| 636 | |
| 637 | /*ARGSUSED*/ |
| 638 | static boolean |
| 639 | multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval) |
| 640 | struct bfd_link_info *info; |
| 641 | const char *name; |
| 642 | bfd *obfd; |
| 643 | asection *osec; |
| 644 | bfd_vma oval; |
| 645 | bfd *nbfd; |
| 646 | asection *nsec; |
| 647 | bfd_vma nval; |
| 648 | { |
| 649 | einfo ("%X%C: multiple definition of `%T'\n", |
| 650 | nbfd, nsec, nval, name); |
| 651 | if (obfd != (bfd *) NULL) |
| 652 | einfo ("%D: first defined here\n", obfd, osec, oval); |
| 653 | return true; |
| 654 | } |
| 655 | |
| 656 | /* This is called when there is a definition of a common symbol, or |
| 657 | when a common symbol is found for a symbol that is already defined, |
| 658 | or when two common symbols are found. We only do something if |
| 659 | -warn-common was used. */ |
| 660 | |
| 661 | /*ARGSUSED*/ |
| 662 | static boolean |
| 663 | multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize) |
| 664 | struct bfd_link_info *info; |
| 665 | const char *name; |
| 666 | bfd *obfd; |
| 667 | enum bfd_link_hash_type otype; |
| 668 | bfd_vma osize; |
| 669 | bfd *nbfd; |
| 670 | enum bfd_link_hash_type ntype; |
| 671 | bfd_vma nsize; |
| 672 | { |
| 673 | if (! config.warn_common) |
| 674 | return true; |
| 675 | |
| 676 | if (ntype == bfd_link_hash_defined |
| 677 | || ntype == bfd_link_hash_defweak |
| 678 | || ntype == bfd_link_hash_indirect) |
| 679 | { |
| 680 | ASSERT (otype == bfd_link_hash_common); |
| 681 | einfo ("%B: warning: definition of `%T' overriding common\n", |
| 682 | nbfd, name); |
| 683 | if (obfd != NULL) |
| 684 | einfo ("%B: warning: common is here\n", obfd); |
| 685 | } |
| 686 | else if (otype == bfd_link_hash_defined |
| 687 | || otype == bfd_link_hash_defweak |
| 688 | || otype == bfd_link_hash_indirect) |
| 689 | { |
| 690 | ASSERT (ntype == bfd_link_hash_common); |
| 691 | einfo ("%B: warning: common of `%T' overridden by definition\n", |
| 692 | nbfd, name); |
| 693 | if (obfd != NULL) |
| 694 | einfo ("%B: warning: defined here\n", obfd); |
| 695 | } |
| 696 | else |
| 697 | { |
| 698 | ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common); |
| 699 | if (osize > nsize) |
| 700 | { |
| 701 | einfo ("%B: warning: common of `%T' overridden by larger common\n", |
| 702 | nbfd, name); |
| 703 | if (obfd != NULL) |
| 704 | einfo ("%B: warning: larger common is here\n", obfd); |
| 705 | } |
| 706 | else if (nsize > osize) |
| 707 | { |
| 708 | einfo ("%B: warning: common of `%T' overriding smaller common\n", |
| 709 | nbfd, name); |
| 710 | if (obfd != NULL) |
| 711 | einfo ("%B: warning: smaller common is here\n", obfd); |
| 712 | } |
| 713 | else |
| 714 | { |
| 715 | einfo ("%B: warning: multiple common of `%T'\n", nbfd, name); |
| 716 | if (obfd != NULL) |
| 717 | einfo ("%B: warning: previous common is here\n", obfd); |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | return true; |
| 722 | } |
| 723 | |
| 724 | /* This is called when BFD has discovered a set element. H is the |
| 725 | entry in the linker hash table for the set. SECTION and VALUE |
| 726 | represent a value which should be added to the set. */ |
| 727 | |
| 728 | /*ARGSUSED*/ |
| 729 | static boolean |
| 730 | add_to_set (info, h, reloc, abfd, section, value) |
| 731 | struct bfd_link_info *info; |
| 732 | struct bfd_link_hash_entry *h; |
| 733 | bfd_reloc_code_real_type reloc; |
| 734 | bfd *abfd; |
| 735 | asection *section; |
| 736 | bfd_vma value; |
| 737 | { |
| 738 | if (! config.build_constructors) |
| 739 | return true; |
| 740 | |
| 741 | ldctor_add_set_entry (h, reloc, section, value); |
| 742 | |
| 743 | if (h->type == bfd_link_hash_new) |
| 744 | { |
| 745 | h->type = bfd_link_hash_undefined; |
| 746 | h->u.undef.abfd = abfd; |
| 747 | /* We don't call bfd_link_add_undef to add this to the list of |
| 748 | undefined symbols because we are going to define it |
| 749 | ourselves. */ |
| 750 | } |
| 751 | |
| 752 | return true; |
| 753 | } |
| 754 | |
| 755 | /* This is called when BFD has discovered a constructor. This is only |
| 756 | called for some object file formats--those which do not handle |
| 757 | constructors in some more clever fashion. This is similar to |
| 758 | adding an element to a set, but less general. */ |
| 759 | |
| 760 | static boolean |
| 761 | constructor_callback (info, constructor, name, abfd, section, value) |
| 762 | struct bfd_link_info *info; |
| 763 | boolean constructor; |
| 764 | const char *name; |
| 765 | bfd *abfd; |
| 766 | asection *section; |
| 767 | bfd_vma value; |
| 768 | { |
| 769 | char *set_name; |
| 770 | char *s; |
| 771 | struct bfd_link_hash_entry *h; |
| 772 | |
| 773 | if (! config.build_constructors) |
| 774 | return true; |
| 775 | |
| 776 | /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a |
| 777 | useful error message. */ |
| 778 | if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL) |
| 779 | einfo ("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported"); |
| 780 | |
| 781 | set_name = (char *) alloca (1 + sizeof "__CTOR_LIST__"); |
| 782 | s = set_name; |
| 783 | if (bfd_get_symbol_leading_char (abfd) != '\0') |
| 784 | *s++ = bfd_get_symbol_leading_char (abfd); |
| 785 | if (constructor) |
| 786 | strcpy (s, "__CTOR_LIST__"); |
| 787 | else |
| 788 | strcpy (s, "__DTOR_LIST__"); |
| 789 | |
| 790 | if (config.map_file != (FILE *) NULL) |
| 791 | fprintf (config.map_file, |
| 792 | "Adding %s to constructor/destructor set %s\n", name, set_name); |
| 793 | |
| 794 | h = bfd_link_hash_lookup (info->hash, set_name, true, true, true); |
| 795 | if (h == (struct bfd_link_hash_entry *) NULL) |
| 796 | einfo ("%P%F: bfd_link_hash_lookup failed: %E"); |
| 797 | if (h->type == bfd_link_hash_new) |
| 798 | { |
| 799 | h->type = bfd_link_hash_undefined; |
| 800 | h->u.undef.abfd = abfd; |
| 801 | /* We don't call bfd_link_add_undef to add this to the list of |
| 802 | undefined symbols because we are going to define it |
| 803 | ourselves. */ |
| 804 | } |
| 805 | |
| 806 | ldctor_add_set_entry (h, BFD_RELOC_CTOR, section, value); |
| 807 | return true; |
| 808 | } |
| 809 | |
| 810 | /* This is called when there is a reference to a warning symbol. */ |
| 811 | |
| 812 | /*ARGSUSED*/ |
| 813 | static boolean |
| 814 | warning_callback (info, warning) |
| 815 | struct bfd_link_info *info; |
| 816 | const char *warning; |
| 817 | { |
| 818 | einfo ("%P: %s\n", warning); |
| 819 | return true; |
| 820 | } |
| 821 | |
| 822 | /* This is called when an undefined symbol is found. */ |
| 823 | |
| 824 | /*ARGSUSED*/ |
| 825 | static boolean |
| 826 | undefined_symbol (info, name, abfd, section, address) |
| 827 | struct bfd_link_info *info; |
| 828 | const char *name; |
| 829 | bfd *abfd; |
| 830 | asection *section; |
| 831 | bfd_vma address; |
| 832 | { |
| 833 | static char *error_name; |
| 834 | static unsigned int error_count; |
| 835 | |
| 836 | #define MAX_ERRORS_IN_A_ROW 5 |
| 837 | |
| 838 | if (config.warn_once) |
| 839 | { |
| 840 | static struct bfd_hash_table *hash; |
| 841 | |
| 842 | /* Only warn once about a particular undefined symbol. */ |
| 843 | |
| 844 | if (hash == NULL) |
| 845 | { |
| 846 | hash = ((struct bfd_hash_table *) |
| 847 | xmalloc (sizeof (struct bfd_hash_table))); |
| 848 | if (! bfd_hash_table_init (hash, bfd_hash_newfunc)) |
| 849 | einfo ("%F%P: bfd_hash_table_init failed: %E\n"); |
| 850 | } |
| 851 | |
| 852 | if (bfd_hash_lookup (hash, name, false, false) != NULL) |
| 853 | return true; |
| 854 | |
| 855 | if (bfd_hash_lookup (hash, name, true, true) == NULL) |
| 856 | einfo ("%F%P: bfd_hash_lookup failed: %E\n"); |
| 857 | } |
| 858 | |
| 859 | /* We never print more than a reasonable number of errors in a row |
| 860 | for a single symbol. */ |
| 861 | if (error_name != (char *) NULL |
| 862 | && strcmp (name, error_name) == 0) |
| 863 | ++error_count; |
| 864 | else |
| 865 | { |
| 866 | error_count = 0; |
| 867 | if (error_name != (char *) NULL) |
| 868 | free (error_name); |
| 869 | error_name = buystring (name); |
| 870 | } |
| 871 | |
| 872 | if (section != NULL) |
| 873 | { |
| 874 | if (error_count < MAX_ERRORS_IN_A_ROW) |
| 875 | einfo ("%X%C: undefined reference to `%T'\n", |
| 876 | abfd, section, address, name); |
| 877 | else if (error_count == MAX_ERRORS_IN_A_ROW) |
| 878 | einfo ("%D: more undefined references to `%T' follow\n", |
| 879 | abfd, section, address, name); |
| 880 | } |
| 881 | else |
| 882 | { |
| 883 | if (error_count < MAX_ERRORS_IN_A_ROW) |
| 884 | einfo ("%X%B: undefined reference to `%T'\n", |
| 885 | abfd, name); |
| 886 | else if (error_count == MAX_ERRORS_IN_A_ROW) |
| 887 | einfo ("%B: more undefined references to `%T' follow\n", |
| 888 | abfd, name); |
| 889 | } |
| 890 | |
| 891 | return true; |
| 892 | } |
| 893 | |
| 894 | /* This is called when a reloc overflows. */ |
| 895 | |
| 896 | /*ARGSUSED*/ |
| 897 | static boolean |
| 898 | reloc_overflow (info, name, reloc_name, addend, abfd, section, address) |
| 899 | struct bfd_link_info *info; |
| 900 | const char *name; |
| 901 | const char *reloc_name; |
| 902 | bfd_vma addend; |
| 903 | bfd *abfd; |
| 904 | asection *section; |
| 905 | bfd_vma address; |
| 906 | { |
| 907 | if (abfd == (bfd *) NULL) |
| 908 | einfo ("%P%X: generated"); |
| 909 | else |
| 910 | einfo ("%X%C:", abfd, section, address); |
| 911 | einfo (" relocation truncated to fit: %s %T", reloc_name, name); |
| 912 | if (addend != 0) |
| 913 | einfo ("+%v", addend); |
| 914 | einfo ("\n"); |
| 915 | return true; |
| 916 | } |
| 917 | |
| 918 | /* This is called when a dangerous relocation is made. */ |
| 919 | |
| 920 | /*ARGSUSED*/ |
| 921 | static boolean |
| 922 | reloc_dangerous (info, message, abfd, section, address) |
| 923 | struct bfd_link_info *info; |
| 924 | const char *message; |
| 925 | bfd *abfd; |
| 926 | asection *section; |
| 927 | bfd_vma address; |
| 928 | { |
| 929 | if (abfd == (bfd *) NULL) |
| 930 | einfo ("%P%X: generated"); |
| 931 | else |
| 932 | einfo ("%X%C:", abfd, section, address); |
| 933 | einfo ("dangerous relocation: %s\n", message); |
| 934 | return true; |
| 935 | } |
| 936 | |
| 937 | /* This is called when a reloc is being generated attached to a symbol |
| 938 | that is not being output. */ |
| 939 | |
| 940 | /*ARGSUSED*/ |
| 941 | static boolean |
| 942 | unattached_reloc (info, name, abfd, section, address) |
| 943 | struct bfd_link_info *info; |
| 944 | const char *name; |
| 945 | bfd *abfd; |
| 946 | asection *section; |
| 947 | bfd_vma address; |
| 948 | { |
| 949 | if (abfd == (bfd *) NULL) |
| 950 | einfo ("%P%X: generated"); |
| 951 | else |
| 952 | einfo ("%X%C:", abfd, section, address); |
| 953 | einfo (" reloc refers to symbol `%T' which is not being output\n", name); |
| 954 | return true; |
| 955 | } |
| 956 | |
| 957 | /* This is called when a symbol in notice_hash is found. Symbols are |
| 958 | put in notice_hash using the -y option. */ |
| 959 | |
| 960 | /*ARGSUSED*/ |
| 961 | static boolean |
| 962 | notice_ysym (info, name, abfd, section, value) |
| 963 | struct bfd_link_info *info; |
| 964 | const char *name; |
| 965 | bfd *abfd; |
| 966 | asection *section; |
| 967 | bfd_vma value; |
| 968 | { |
| 969 | einfo ("%B: %s %s\n", abfd, |
| 970 | bfd_is_und_section (section) ? "reference to" : "definition of", |
| 971 | name); |
| 972 | return true; |
| 973 | } |