1 /* as.c - GAS main program. 2 Copyright (C) 1987-2016 Free Software Foundation, Inc. 3 4 This file is part of GAS, the GNU Assembler. 5 6 GAS is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GAS is distributed in the hope that it will be useful, but WITHOUT 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14 License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GAS; see the file COPYING. If not, write to the Free 18 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 19 02110-1301, USA. */ 20 21 /* Main program for AS; a 32-bit assembler of GNU. 22 Understands command arguments. 23 Has a few routines that don't fit in other modules because they 24 are shared. 25 26 bugs 27 28 : initialisers 29 Since no-one else says they will support them in future: I 30 don't support them now. */ 31 32 #define COMMON 33 34 #include "as.h" 35 #include "subsegs.h" 36 #include "output-file.h" 37 #include "sb.h" 38 #include "macro.h" 39 #include "dwarf2dbg.h" 40 #include "dw2gencfi.h" 41 #include "bfdver.h" 42 43 #ifdef HAVE_ITBL_CPU 44 #include "itbl-ops.h" 45 #else 46 #define itbl_init() 47 #endif 48 49 #ifdef __MACH__ 50 #undef HAVE_SBRK 51 #endif 52 53 #ifdef HAVE_SBRK 54 #ifdef NEED_DECLARATION_SBRK 55 extern void *sbrk (); 56 #endif 57 #endif 58 59 #ifdef USING_CGEN 60 /* Perform any cgen specific initialisation for gas. */ 61 extern void gas_cgen_begin (void); 62 #endif 63 64 /* We build a list of defsyms as we read the options, and then define 65 them after we have initialized everything. */ 66 struct defsym_list 67 { 68 struct defsym_list *next; 69 char *name; 70 valueT value; 71 }; 72 73 74 /* True if a listing is wanted. */ 75 int listing; 76 77 /* Type of debugging to generate. */ 78 enum debug_info_type debug_type = DEBUG_UNSPECIFIED; 79 int use_gnu_debug_info_extensions = 0; 80 81 #ifndef MD_DEBUG_FORMAT_SELECTOR 82 #define MD_DEBUG_FORMAT_SELECTOR NULL 83 #endif 84 static enum debug_info_type (*md_debug_format_selector) (int *) = MD_DEBUG_FORMAT_SELECTOR; 85 86 /* Maximum level of macro nesting. */ 87 int max_macro_nest = 100; 88 89 /* argv[0] */ 90 static char * myname; 91 92 /* The default obstack chunk size. If we set this to zero, the 93 obstack code will use whatever will fit in a 4096 byte block. */ 94 int chunksize = 0; 95 96 /* To monitor memory allocation more effectively, make this non-zero. 97 Then the chunk sizes for gas and bfd will be reduced. */ 98 int debug_memory = 0; 99 100 /* Enable verbose mode. */ 101 int verbose = 0; 102 103 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF 104 int flag_use_elf_stt_common = DEFAULT_GENERATE_ELF_STT_COMMON; 105 #endif 106 107 /* Enable incbin directive. */ 108 int allow_incbin_directive = 1; 109 110 /* Keep the output file. */ 111 static int keep_it = 0; 112 113 segT reg_section; 114 segT expr_section; 115 segT text_section; 116 segT data_section; 117 segT bss_section; 118 119 /* Name of listing file. */ 120 static char *listing_filename = NULL; 121 122 static struct defsym_list *defsyms; 123 124 #ifdef HAVE_ITBL_CPU 125 /* Keep a record of the itbl files we read in. */ 126 struct itbl_file_list 127 { 128 struct itbl_file_list *next; 129 char *name; 130 }; 131 static struct itbl_file_list *itbl_files; 132 #endif 133 134 static long start_time; 135 #ifdef HAVE_SBRK 136 char *start_sbrk; 137 #endif 138 139 static int flag_macro_alternate; 140 141 142 #ifdef USE_EMULATIONS 144 #define EMULATION_ENVIRON "AS_EMULATION" 145 146 extern struct emulation mipsbelf, mipslelf, mipself; 147 extern struct emulation i386coff, i386elf, i386aout; 148 extern struct emulation crisaout, criself; 149 150 static struct emulation *const emulations[] = { EMULATIONS }; 151 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]); 152 153 static void 154 select_emulation_mode (int argc, char **argv) 155 { 156 int i; 157 char *p; 158 const char *em = NULL; 159 160 for (i = 1; i < argc; i++) 161 if (!strncmp ("--em", argv[i], 4)) 162 break; 163 164 if (i == argc) 165 goto do_default; 166 167 p = strchr (argv[i], '='); 168 if (p) 169 p++; 170 else 171 p = argv[i + 1]; 172 173 if (!p || !*p) 174 as_fatal (_("missing emulation mode name")); 175 em = p; 176 177 do_default: 178 if (em == 0) 179 em = getenv (EMULATION_ENVIRON); 180 if (em == 0) 181 em = DEFAULT_EMULATION; 182 183 if (em) 184 { 185 for (i = 0; i < n_emulations; i++) 186 if (!strcmp (emulations[i]->name, em)) 187 break; 188 if (i == n_emulations) 189 as_fatal (_("unrecognized emulation name `%s'"), em); 190 this_emulation = emulations[i]; 191 } 192 else 193 this_emulation = emulations[0]; 194 195 this_emulation->init (); 196 } 197 198 const char * 199 default_emul_bfd_name (void) 200 { 201 abort (); 202 return NULL; 203 } 204 205 void 206 common_emul_init (void) 207 { 208 this_format = this_emulation->format; 209 210 if (this_emulation->leading_underscore == 2) 211 this_emulation->leading_underscore = this_format->dfl_leading_underscore; 212 213 if (this_emulation->default_endian != 2) 214 target_big_endian = this_emulation->default_endian; 215 216 if (this_emulation->fake_label_name == 0) 217 { 218 if (this_emulation->leading_underscore) 219 this_emulation->fake_label_name = "L0\001"; 220 else 221 /* What other parameters should we test? */ 222 this_emulation->fake_label_name = ".L0\001"; 223 } 224 } 225 #endif 226 227 void 228 print_version_id (void) 229 { 230 static int printed; 231 232 if (printed) 233 return; 234 printed = 1; 235 236 fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s\n"), 237 VERSION, TARGET_ALIAS, BFD_VERSION_STRING); 238 } 239 240 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG 241 enum compressed_debug_section_type flag_compress_debug 242 = COMPRESS_DEBUG_GABI_ZLIB; 243 #endif 244 245 static void 246 show_usage (FILE * stream) 247 { 248 fprintf (stream, _("Usage: %s [option...] [asmfile...]\n"), myname); 249 250 fprintf (stream, _("\ 251 Options:\n\ 252 -a[sub-option...] turn on listings\n\ 253 Sub-options [default hls]:\n\ 254 c omit false conditionals\n\ 255 d omit debugging directives\n\ 256 g include general info\n\ 257 h include high-level source\n\ 258 l include assembly\n\ 259 m include macro expansions\n\ 260 n omit forms processing\n\ 261 s include symbols\n\ 262 =FILE list to FILE (must be last sub-option)\n")); 263 264 fprintf (stream, _("\ 265 --alternate initially turn on alternate macro syntax\n")); 266 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG 267 fprintf (stream, _("\ 268 --compress-debug-sections[={none|zlib|zlib-gnu|zlib-gabi}]\n\ 269 compress DWARF debug sections using zlib [default]\n")); 270 fprintf (stream, _("\ 271 --nocompress-debug-sections\n\ 272 don't compress DWARF debug sections\n")); 273 #else 274 fprintf (stream, _("\ 275 --compress-debug-sections[={none|zlib|zlib-gnu|zlib-gabi}]\n\ 276 compress DWARF debug sections using zlib\n")); 277 fprintf (stream, _("\ 278 --nocompress-debug-sections\n\ 279 don't compress DWARF debug sections [default]\n")); 280 #endif 281 fprintf (stream, _("\ 282 -D produce assembler debugging messages\n")); 283 fprintf (stream, _("\ 284 --debug-prefix-map OLD=NEW\n\ 285 map OLD to NEW in debug information\n")); 286 fprintf (stream, _("\ 287 --defsym SYM=VAL define symbol SYM to given value\n")); 288 #ifdef USE_EMULATIONS 289 { 290 int i; 291 const char *def_em; 292 293 fprintf (stream, "\ 294 --em=["); 295 for (i = 0; i < n_emulations - 1; i++) 296 fprintf (stream, "%s | ", emulations[i]->name); 297 fprintf (stream, "%s]\n", emulations[i]->name); 298 299 def_em = getenv (EMULATION_ENVIRON); 300 if (!def_em) 301 def_em = DEFAULT_EMULATION; 302 fprintf (stream, _("\ 303 emulate output (default %s)\n"), def_em); 304 } 305 #endif 306 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF 307 fprintf (stream, _("\ 308 --execstack require executable stack for this object\n")); 309 fprintf (stream, _("\ 310 --noexecstack don't require executable stack for this object\n")); 311 fprintf (stream, _("\ 312 --size-check=[error|warning]\n\ 313 ELF .size directive check (default --size-check=error)\n")); 314 fprintf (stream, _("\ 315 --elf-stt-common=[no|yes]\n\ 316 generate ELF common symbols with STT_COMMON type\n")); 317 fprintf (stream, _("\ 318 --sectname-subst enable section name substitution sequences\n")); 319 #endif 320 fprintf (stream, _("\ 321 -f skip whitespace and comment preprocessing\n")); 322 fprintf (stream, _("\ 323 -g --gen-debug generate debugging information\n")); 324 fprintf (stream, _("\ 325 --gstabs generate STABS debugging information\n")); 326 fprintf (stream, _("\ 327 --gstabs+ generate STABS debug info with GNU extensions\n")); 328 fprintf (stream, _("\ 329 --gdwarf-2 generate DWARF2 debugging information\n")); 330 fprintf (stream, _("\ 331 --gdwarf-sections generate per-function section names for DWARF line information\n")); 332 fprintf (stream, _("\ 333 --hash-size=<value> set the hash table size close to <value>\n")); 334 fprintf (stream, _("\ 335 --help show this message and exit\n")); 336 fprintf (stream, _("\ 337 --target-help show target specific options\n")); 338 fprintf (stream, _("\ 339 -I DIR add DIR to search list for .include directives\n")); 340 fprintf (stream, _("\ 341 -J don't warn about signed overflow\n")); 342 fprintf (stream, _("\ 343 -K warn when differences altered for long displacements\n")); 344 fprintf (stream, _("\ 345 -L,--keep-locals keep local symbols (e.g. starting with `L')\n")); 346 fprintf (stream, _("\ 347 -M,--mri assemble in MRI compatibility mode\n")); 348 fprintf (stream, _("\ 349 --MD FILE write dependency information in FILE (default none)\n")); 350 fprintf (stream, _("\ 351 -nocpp ignored\n")); 352 fprintf (stream, _("\ 353 -no-pad-sections do not pad the end of sections to alignment boundaries\n")); 354 fprintf (stream, _("\ 355 -o OBJFILE name the object-file output OBJFILE (default a.out)\n")); 356 fprintf (stream, _("\ 357 -R fold data section into text section\n")); 358 fprintf (stream, _("\ 359 --reduce-memory-overheads \n\ 360 prefer smaller memory use at the cost of longer\n\ 361 assembly times\n")); 362 fprintf (stream, _("\ 363 --statistics print various measured statistics from execution\n")); 364 fprintf (stream, _("\ 365 --strip-local-absolute strip local absolute symbols\n")); 366 fprintf (stream, _("\ 367 --traditional-format Use same format as native assembler when possible\n")); 368 fprintf (stream, _("\ 369 --version print assembler version number and exit\n")); 370 fprintf (stream, _("\ 371 -W --no-warn suppress warnings\n")); 372 fprintf (stream, _("\ 373 --warn don't suppress warnings\n")); 374 fprintf (stream, _("\ 375 --fatal-warnings treat warnings as errors\n")); 376 #ifdef HAVE_ITBL_CPU 377 fprintf (stream, _("\ 378 --itbl INSTTBL extend instruction set to include instructions\n\ 379 matching the specifications defined in file INSTTBL\n")); 380 #endif 381 fprintf (stream, _("\ 382 -w ignored\n")); 383 fprintf (stream, _("\ 384 -X ignored\n")); 385 fprintf (stream, _("\ 386 -Z generate object file even after errors\n")); 387 fprintf (stream, _("\ 388 --listing-lhs-width set the width in words of the output data column of\n\ 389 the listing\n")); 390 fprintf (stream, _("\ 391 --listing-lhs-width2 set the width in words of the continuation lines\n\ 392 of the output data column; ignored if smaller than\n\ 393 the width of the first line\n")); 394 fprintf (stream, _("\ 395 --listing-rhs-width set the max width in characters of the lines from\n\ 396 the source file\n")); 397 fprintf (stream, _("\ 398 --listing-cont-lines set the maximum number of continuation lines used\n\ 399 for the output data column of the listing\n")); 400 fprintf (stream, _("\ 401 @FILE read options from FILE\n")); 402 403 md_show_usage (stream); 404 405 fputc ('\n', stream); 406 407 if (REPORT_BUGS_TO[0] && stream == stdout) 408 fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO); 409 } 410 411 /* Since it is easy to do here we interpret the special arg "-" 412 to mean "use stdin" and we set that argv[] pointing to "". 413 After we have munged argv[], the only things left are source file 414 name(s) and ""(s) denoting stdin. These file names are used 415 (perhaps more than once) later. 416 417 check for new machine-dep cmdline options in 418 md_parse_option definitions in config/tc-*.c. */ 419 420 static void 421 parse_args (int * pargc, char *** pargv) 422 { 423 int old_argc; 424 int new_argc; 425 char ** old_argv; 426 char ** new_argv; 427 /* Starting the short option string with '-' is for programs that 428 expect options and other ARGV-elements in any order and that care about 429 the ordering of the two. We describe each non-option ARGV-element 430 as if it were the argument of an option with character code 1. */ 431 char *shortopts; 432 extern const char *md_shortopts; 433 static const char std_shortopts[] = 434 { 435 '-', 'J', 436 #ifndef WORKING_DOT_WORD 437 /* -K is not meaningful if .word is not being hacked. */ 438 'K', 439 #endif 440 'L', 'M', 'R', 'W', 'Z', 'a', ':', ':', 'D', 'f', 'g', ':',':', 'I', ':', 'o', ':', 441 #ifndef VMS 442 /* -v takes an argument on VMS, so we don't make it a generic 443 option. */ 444 'v', 445 #endif 446 'w', 'X', 447 #ifdef HAVE_ITBL_CPU 448 /* New option for extending instruction set (see also --itbl below). */ 449 't', ':', 450 #endif 451 '\0' 452 }; 453 struct option *longopts; 454 extern struct option md_longopts[]; 455 extern size_t md_longopts_size; 456 /* Codes used for the long options with no short synonyms. */ 457 enum option_values 458 { 459 OPTION_HELP = OPTION_STD_BASE, 460 OPTION_NOCPP, 461 OPTION_STATISTICS, 462 OPTION_VERSION, 463 OPTION_DUMPCONFIG, 464 OPTION_VERBOSE, 465 OPTION_EMULATION, 466 OPTION_DEBUG_PREFIX_MAP, 467 OPTION_DEFSYM, 468 OPTION_LISTING_LHS_WIDTH, 469 OPTION_LISTING_LHS_WIDTH2, 470 OPTION_LISTING_RHS_WIDTH, 471 OPTION_LISTING_CONT_LINES, 472 OPTION_DEPFILE, 473 OPTION_GSTABS, 474 OPTION_GSTABS_PLUS, 475 OPTION_GDWARF2, 476 OPTION_GDWARF_SECTIONS, 477 OPTION_STRIP_LOCAL_ABSOLUTE, 478 OPTION_TRADITIONAL_FORMAT, 479 OPTION_WARN, 480 OPTION_TARGET_HELP, 481 OPTION_EXECSTACK, 482 OPTION_NOEXECSTACK, 483 OPTION_SIZE_CHECK, 484 OPTION_ELF_STT_COMMON, 485 OPTION_SECTNAME_SUBST, 486 OPTION_ALTERNATE, 487 OPTION_AL, 488 OPTION_HASH_TABLE_SIZE, 489 OPTION_REDUCE_MEMORY_OVERHEADS, 490 OPTION_WARN_FATAL, 491 OPTION_COMPRESS_DEBUG, 492 OPTION_NOCOMPRESS_DEBUG, 493 OPTION_NO_PAD_SECTIONS, /* = STD_BASE + 40 */ 494 OPTION_ALLOW_INCBIN, 495 OPTION_NOALLOW_INCBIN 496 /* When you add options here, check that they do 497 not collide with OPTION_MD_BASE. See as.h. */ 498 }; 499 500 static const struct option std_longopts[] = 501 { 502 /* Note: commas are placed at the start of the line rather than 503 the end of the preceding line so that it is simpler to 504 selectively add and remove lines from this list. */ 505 {"alternate", no_argument, NULL, OPTION_ALTERNATE} 506 /* The entry for "a" is here to prevent getopt_long_only() from 507 considering that -a is an abbreviation for --alternate. This is 508 necessary because -a=<FILE> is a valid switch but getopt would 509 normally reject it since --alternate does not take an argument. */ 510 ,{"a", optional_argument, NULL, 'a'} 511 /* Handle -al=<FILE>. */ 512 ,{"al", optional_argument, NULL, OPTION_AL} 513 ,{"compress-debug-sections", optional_argument, NULL, OPTION_COMPRESS_DEBUG} 514 ,{"nocompress-debug-sections", no_argument, NULL, OPTION_NOCOMPRESS_DEBUG} 515 ,{"allow-incbin", optional_argument, NULL, OPTION_ALLOW_INCBIN} 516 ,{"noallow-incbin", optional_argument, NULL, OPTION_NOALLOW_INCBIN} 517 ,{"debug-prefix-map", required_argument, NULL, OPTION_DEBUG_PREFIX_MAP} 518 ,{"defsym", required_argument, NULL, OPTION_DEFSYM} 519 ,{"dump-config", no_argument, NULL, OPTION_DUMPCONFIG} 520 ,{"emulation", required_argument, NULL, OPTION_EMULATION} 521 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF 522 ,{"execstack", no_argument, NULL, OPTION_EXECSTACK} 523 ,{"noexecstack", no_argument, NULL, OPTION_NOEXECSTACK} 524 ,{"size-check", required_argument, NULL, OPTION_SIZE_CHECK} 525 ,{"elf-stt-common", required_argument, NULL, OPTION_ELF_STT_COMMON} 526 ,{"sectname-subst", no_argument, NULL, OPTION_SECTNAME_SUBST} 527 #endif 528 ,{"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL} 529 ,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF2} 530 /* GCC uses --gdwarf-2 but GAS uses to use --gdwarf2, 531 so we keep it here for backwards compatibility. */ 532 ,{"gdwarf2", no_argument, NULL, OPTION_GDWARF2} 533 ,{"gdwarf-sections", no_argument, NULL, OPTION_GDWARF_SECTIONS} 534 ,{"gen-debug", no_argument, NULL, 'g'} 535 ,{"gstabs", no_argument, NULL, OPTION_GSTABS} 536 ,{"gstabs+", no_argument, NULL, OPTION_GSTABS_PLUS} 537 ,{"hash-size", required_argument, NULL, OPTION_HASH_TABLE_SIZE} 538 ,{"help", no_argument, NULL, OPTION_HELP} 539 #ifdef HAVE_ITBL_CPU 540 /* New option for extending instruction set (see also -t above). 541 The "-t file" or "--itbl file" option extends the basic set of 542 valid instructions by reading "file", a text file containing a 543 list of instruction formats. The additional opcodes and their 544 formats are added to the built-in set of instructions, and 545 mnemonics for new registers may also be defined. */ 546 ,{"itbl", required_argument, NULL, 't'} 547 #endif 548 /* getopt allows abbreviations, so we do this to stop it from 549 treating -k as an abbreviation for --keep-locals. Some 550 ports use -k to enable PIC assembly. */ 551 ,{"keep-locals", no_argument, NULL, 'L'} 552 ,{"keep-locals", no_argument, NULL, 'L'} 553 ,{"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH} 554 ,{"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2} 555 ,{"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH} 556 ,{"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES} 557 ,{"MD", required_argument, NULL, OPTION_DEPFILE} 558 ,{"mri", no_argument, NULL, 'M'} 559 ,{"nocpp", no_argument, NULL, OPTION_NOCPP} 560 ,{"no-pad-sections", no_argument, NULL, OPTION_NO_PAD_SECTIONS} 561 ,{"no-warn", no_argument, NULL, 'W'} 562 ,{"reduce-memory-overheads", no_argument, NULL, OPTION_REDUCE_MEMORY_OVERHEADS} 563 ,{"statistics", no_argument, NULL, OPTION_STATISTICS} 564 ,{"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE} 565 ,{"version", no_argument, NULL, OPTION_VERSION} 566 ,{"verbose", no_argument, NULL, OPTION_VERBOSE} 567 ,{"target-help", no_argument, NULL, OPTION_TARGET_HELP} 568 ,{"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT} 569 ,{"warn", no_argument, NULL, OPTION_WARN} 570 }; 571 572 /* Construct the option lists from the standard list and the target 573 dependent list. Include space for an extra NULL option and 574 always NULL terminate. */ 575 shortopts = concat (std_shortopts, md_shortopts, (char *) NULL); 576 longopts = (struct option *) xmalloc (sizeof (std_longopts) 577 + md_longopts_size + sizeof (struct option)); 578 memcpy (longopts, std_longopts, sizeof (std_longopts)); 579 memcpy (((char *) longopts) + sizeof (std_longopts), md_longopts, md_longopts_size); 580 memset (((char *) longopts) + sizeof (std_longopts) + md_longopts_size, 581 0, sizeof (struct option)); 582 583 /* Make a local copy of the old argv. */ 584 old_argc = *pargc; 585 old_argv = *pargv; 586 587 /* Initialize a new argv that contains no options. */ 588 new_argv = XNEWVEC (char *, old_argc + 1); 589 new_argv[0] = old_argv[0]; 590 new_argc = 1; 591 new_argv[new_argc] = NULL; 592 593 while (1) 594 { 595 /* getopt_long_only is like getopt_long, but '-' as well as '--' can 596 indicate a long option. */ 597 int longind; 598 int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts, 599 &longind); 600 601 if (optc == -1) 602 break; 603 604 switch (optc) 605 { 606 default: 607 /* md_parse_option should return 1 if it recognizes optc, 608 0 if not. */ 609 if (md_parse_option (optc, optarg) != 0) 610 break; 611 /* `-v' isn't included in the general short_opts list, so check for 612 it explicitly here before deciding we've gotten a bad argument. */ 613 if (optc == 'v') 614 { 615 #ifdef VMS 616 /* Telling getopt to treat -v's value as optional can result 617 in it picking up a following filename argument here. The 618 VMS code in md_parse_option can return 0 in that case, 619 but it has no way of pushing the filename argument back. */ 620 if (optarg && *optarg) 621 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL; 622 else 623 #else 624 case 'v': 625 #endif 626 case OPTION_VERBOSE: 627 print_version_id (); 628 verbose = 1; 629 break; 630 } 631 else 632 as_bad (_("unrecognized option -%c%s"), optc, optarg ? optarg : ""); 633 /* Fall through. */ 634 635 case '?': 636 exit (EXIT_FAILURE); 637 638 case 1: /* File name. */ 639 if (!strcmp (optarg, "-")) 640 optarg = (char *) ""; 641 new_argv[new_argc++] = optarg; 642 new_argv[new_argc] = NULL; 643 break; 644 645 case OPTION_TARGET_HELP: 646 md_show_usage (stdout); 647 exit (EXIT_SUCCESS); 648 649 case OPTION_HELP: 650 show_usage (stdout); 651 exit (EXIT_SUCCESS); 652 653 case OPTION_NOCPP: 654 break; 655 656 case OPTION_NO_PAD_SECTIONS: 657 do_not_pad_sections_to_alignment = 1; 658 break; 659 660 case OPTION_STATISTICS: 661 flag_print_statistics = 1; 662 break; 663 664 case OPTION_STRIP_LOCAL_ABSOLUTE: 665 flag_strip_local_absolute = 1; 666 break; 667 668 case OPTION_TRADITIONAL_FORMAT: 669 flag_traditional_format = 1; 670 break; 671 672 case OPTION_VERSION: 673 /* This output is intended to follow the GNU standards document. */ 674 printf (_("GNU assembler %s\n"), BFD_VERSION_STRING); 675 printf (_("Copyright (C) 2016 Free Software Foundation, Inc.\n")); 676 printf (_("\ 677 This program is free software; you may redistribute it under the terms of\n\ 678 the GNU General Public License version 3 or later.\n\ 679 This program has absolutely no warranty.\n")); 680 #ifdef TARGET_WITH_CPU 681 printf (_("This assembler was configured for a target of `%s' " 682 "and default,\ncpu type `%s'.\n"), 683 TARGET_ALIAS, TARGET_WITH_CPU); 684 #else 685 printf (_("This assembler was configured for a target of `%s'.\n"), 686 TARGET_ALIAS); 687 #endif 688 exit (EXIT_SUCCESS); 689 690 case OPTION_EMULATION: 691 #ifdef USE_EMULATIONS 692 if (strcmp (optarg, this_emulation->name)) 693 as_fatal (_("multiple emulation names specified")); 694 #else 695 as_fatal (_("emulations not handled in this configuration")); 696 #endif 697 break; 698 699 case OPTION_DUMPCONFIG: 700 fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS); 701 fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL); 702 fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU); 703 #ifdef TARGET_OBJ_FORMAT 704 fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT); 705 #endif 706 #ifdef TARGET_FORMAT 707 fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT); 708 #endif 709 exit (EXIT_SUCCESS); 710 711 case OPTION_COMPRESS_DEBUG: 712 if (optarg) 713 { 714 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF 715 if (strcasecmp (optarg, "none") == 0) 716 flag_compress_debug = COMPRESS_DEBUG_NONE; 717 else if (strcasecmp (optarg, "zlib") == 0) 718 flag_compress_debug = COMPRESS_DEBUG_GABI_ZLIB; 719 else if (strcasecmp (optarg, "zlib-gnu") == 0) 720 flag_compress_debug = COMPRESS_DEBUG_GNU_ZLIB; 721 else if (strcasecmp (optarg, "zlib-gabi") == 0) 722 flag_compress_debug = COMPRESS_DEBUG_GABI_ZLIB; 723 else 724 as_fatal (_("Invalid --compress-debug-sections option: `%s'"), 725 optarg); 726 #else 727 as_fatal (_("--compress-debug-sections=%s is unsupported"), 728 optarg); 729 #endif 730 } 731 else 732 flag_compress_debug = COMPRESS_DEBUG_GABI_ZLIB; 733 break; 734 735 case OPTION_NOCOMPRESS_DEBUG: 736 flag_compress_debug = COMPRESS_DEBUG_NONE; 737 break; 738 739 case OPTION_ALLOW_INCBIN: 740 allow_incbin_directive = 1; 741 break; 742 743 case OPTION_NOALLOW_INCBIN: 744 allow_incbin_directive = 0; 745 break; 746 747 case OPTION_DEBUG_PREFIX_MAP: 748 add_debug_prefix_map (optarg); 749 break; 750 751 case OPTION_DEFSYM: 752 { 753 char *s; 754 valueT i; 755 struct defsym_list *n; 756 757 for (s = optarg; *s != '\0' && *s != '='; s++) 758 ; 759 if (*s == '\0') 760 as_fatal (_("bad defsym; format is --defsym name=value")); 761 *s++ = '\0'; 762 i = bfd_scan_vma (s, (const char **) NULL, 0); 763 n = XNEW (struct defsym_list); 764 n->next = defsyms; 765 n->name = optarg; 766 n->value = i; 767 defsyms = n; 768 } 769 break; 770 771 #ifdef HAVE_ITBL_CPU 772 case 't': 773 { 774 /* optarg is the name of the file containing the instruction 775 formats, opcodes, register names, etc. */ 776 struct itbl_file_list *n; 777 778 if (optarg == NULL) 779 { 780 as_warn (_("no file name following -t option")); 781 break; 782 } 783 784 n = XNEW (struct itbl_file_list); 785 n->next = itbl_files; 786 n->name = optarg; 787 itbl_files = n; 788 789 /* Parse the file and add the new instructions to our internal 790 table. If multiple instruction tables are specified, the 791 information from this table gets appended onto the existing 792 internal table. */ 793 itbl_files->name = xstrdup (optarg); 794 if (itbl_parse (itbl_files->name) != 0) 795 as_fatal (_("failed to read instruction table %s\n"), 796 itbl_files->name); 797 } 798 break; 799 #endif 800 801 case OPTION_DEPFILE: 802 start_dependencies (optarg); 803 break; 804 805 case 'g': 806 /* Some backends, eg Alpha and Mips, use the -g switch for their 807 own purposes. So we check here for an explicit -g and allow 808 the backend to decide if it wants to process it. */ 809 if ( old_argv[optind - 1][1] == 'g' 810 && md_parse_option (optc, optarg)) 811 continue; 812 813 if (md_debug_format_selector) 814 debug_type = md_debug_format_selector (& use_gnu_debug_info_extensions); 815 else if (IS_ELF) 816 debug_type = DEBUG_DWARF2; 817 else 818 debug_type = DEBUG_STABS; 819 break; 820 821 case OPTION_GSTABS_PLUS: 822 use_gnu_debug_info_extensions = 1; 823 /* Fall through. */ 824 case OPTION_GSTABS: 825 debug_type = DEBUG_STABS; 826 break; 827 828 case OPTION_GDWARF2: 829 debug_type = DEBUG_DWARF2; 830 break; 831 832 case OPTION_GDWARF_SECTIONS: 833 flag_dwarf_sections = TRUE; 834 break; 835 836 case 'J': 837 flag_signed_overflow_ok = 1; 838 break; 839 840 #ifndef WORKING_DOT_WORD 841 case 'K': 842 flag_warn_displacement = 1; 843 break; 844 #endif 845 case 'L': 846 flag_keep_locals = 1; 847 break; 848 849 case OPTION_LISTING_LHS_WIDTH: 850 listing_lhs_width = atoi (optarg); 851 if (listing_lhs_width_second < listing_lhs_width) 852 listing_lhs_width_second = listing_lhs_width; 853 break; 854 case OPTION_LISTING_LHS_WIDTH2: 855 { 856 int tmp = atoi (optarg); 857 858 if (tmp > listing_lhs_width) 859 listing_lhs_width_second = tmp; 860 } 861 break; 862 case OPTION_LISTING_RHS_WIDTH: 863 listing_rhs_width = atoi (optarg); 864 break; 865 case OPTION_LISTING_CONT_LINES: 866 listing_lhs_cont_lines = atoi (optarg); 867 break; 868 869 case 'M': 870 flag_mri = 1; 871 #ifdef TC_M68K 872 flag_m68k_mri = 1; 873 #endif 874 break; 875 876 case 'R': 877 flag_readonly_data_in_text = 1; 878 break; 879 880 case 'W': 881 flag_no_warnings = 1; 882 break; 883 884 case OPTION_WARN: 885 flag_no_warnings = 0; 886 flag_fatal_warnings = 0; 887 break; 888 889 case OPTION_WARN_FATAL: 890 flag_no_warnings = 0; 891 flag_fatal_warnings = 1; 892 break; 893 894 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF 895 case OPTION_EXECSTACK: 896 flag_execstack = 1; 897 flag_noexecstack = 0; 898 break; 899 900 case OPTION_NOEXECSTACK: 901 flag_noexecstack = 1; 902 flag_execstack = 0; 903 break; 904 905 case OPTION_SIZE_CHECK: 906 if (strcasecmp (optarg, "error") == 0) 907 flag_allow_nonconst_size = FALSE; 908 else if (strcasecmp (optarg, "warning") == 0) 909 flag_allow_nonconst_size = TRUE; 910 else 911 as_fatal (_("Invalid --size-check= option: `%s'"), optarg); 912 break; 913 914 case OPTION_ELF_STT_COMMON: 915 if (strcasecmp (optarg, "no") == 0) 916 flag_use_elf_stt_common = 0; 917 else if (strcasecmp (optarg, "yes") == 0) 918 flag_use_elf_stt_common = 1; 919 else 920 as_fatal (_("Invalid --elf-stt-common= option: `%s'"), 921 optarg); 922 break; 923 924 case OPTION_SECTNAME_SUBST: 925 flag_sectname_subst = 1; 926 break; 927 #endif 928 case 'Z': 929 flag_always_generate_output = 1; 930 break; 931 932 case OPTION_AL: 933 listing |= LISTING_LISTING; 934 if (optarg) 935 listing_filename = xstrdup (optarg); 936 break; 937 938 case OPTION_ALTERNATE: 939 optarg = old_argv [optind - 1]; 940 while (* optarg == '-') 941 optarg ++; 942 943 if (strcmp (optarg, "alternate") == 0) 944 { 945 flag_macro_alternate = 1; 946 break; 947 } 948 optarg ++; 949 /* Fall through. */ 950 951 case 'a': 952 if (optarg) 953 { 954 if (optarg != old_argv[optind] && optarg[-1] == '=') 955 --optarg; 956 957 if (md_parse_option (optc, optarg) != 0) 958 break; 959 960 while (*optarg) 961 { 962 switch (*optarg) 963 { 964 case 'c': 965 listing |= LISTING_NOCOND; 966 break; 967 case 'd': 968 listing |= LISTING_NODEBUG; 969 break; 970 case 'g': 971 listing |= LISTING_GENERAL; 972 break; 973 case 'h': 974 listing |= LISTING_HLL; 975 break; 976 case 'l': 977 listing |= LISTING_LISTING; 978 break; 979 case 'm': 980 listing |= LISTING_MACEXP; 981 break; 982 case 'n': 983 listing |= LISTING_NOFORM; 984 break; 985 case 's': 986 listing |= LISTING_SYMBOLS; 987 break; 988 case '=': 989 listing_filename = xstrdup (optarg + 1); 990 optarg += strlen (listing_filename); 991 break; 992 default: 993 as_fatal (_("invalid listing option `%c'"), *optarg); 994 break; 995 } 996 optarg++; 997 } 998 } 999 if (!listing) 1000 listing = LISTING_DEFAULT; 1001 break; 1002 1003 case 'D': 1004 /* DEBUG is implemented: it debugs different 1005 things from other people's assemblers. */ 1006 flag_debug = 1; 1007 break; 1008 1009 case 'f': 1010 flag_no_comments = 1; 1011 break; 1012 1013 case 'I': 1014 { /* Include file directory. */ 1015 char *temp = xstrdup (optarg); 1016 1017 add_include_dir (temp); 1018 break; 1019 } 1020 1021 case 'o': 1022 out_file_name = xstrdup (optarg); 1023 break; 1024 1025 case 'w': 1026 break; 1027 1028 case 'X': 1029 /* -X means treat warnings as errors. */ 1030 break; 1031 1032 case OPTION_REDUCE_MEMORY_OVERHEADS: 1033 /* The only change we make at the moment is to reduce 1034 the size of the hash tables that we use. */ 1035 set_gas_hash_table_size (4051); 1036 break; 1037 1038 case OPTION_HASH_TABLE_SIZE: 1039 { 1040 unsigned long new_size; 1041 1042 new_size = strtoul (optarg, NULL, 0); 1043 if (new_size) 1044 set_gas_hash_table_size (new_size); 1045 else 1046 as_fatal (_("--hash-size needs a numeric argument")); 1047 break; 1048 } 1049 } 1050 } 1051 1052 free (shortopts); 1053 free (longopts); 1054 1055 *pargc = new_argc; 1056 *pargv = new_argv; 1057 1058 #ifdef md_after_parse_args 1059 md_after_parse_args (); 1060 #endif 1061 } 1062 1063 static void 1064 dump_statistics (void) 1065 { 1066 #ifdef HAVE_SBRK 1067 char *lim = (char *) sbrk (0); 1068 #endif 1069 long run_time = get_run_time () - start_time; 1070 1071 fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"), 1072 myname, run_time / 1000000, run_time % 1000000); 1073 #ifdef HAVE_SBRK 1074 fprintf (stderr, _("%s: data size %ld\n"), 1075 myname, (long) (lim - start_sbrk)); 1076 #endif 1077 1078 subsegs_print_statistics (stderr); 1079 write_print_statistics (stderr); 1080 symbol_print_statistics (stderr); 1081 read_print_statistics (stderr); 1082 1083 #ifdef tc_print_statistics 1084 tc_print_statistics (stderr); 1085 #endif 1086 1087 #ifdef obj_print_statistics 1088 obj_print_statistics (stderr); 1089 #endif 1090 } 1091 1092 static void 1093 close_output_file (void) 1094 { 1095 output_file_close (out_file_name); 1096 if (!keep_it) 1097 unlink_if_ordinary (out_file_name); 1098 } 1099 1100 /* The interface between the macro code and gas expression handling. */ 1101 1102 static size_t 1103 macro_expr (const char *emsg, size_t idx, sb *in, offsetT *val) 1104 { 1105 char *hold; 1106 expressionS ex; 1107 1108 sb_terminate (in); 1109 1110 hold = input_line_pointer; 1111 input_line_pointer = in->ptr + idx; 1112 expression_and_evaluate (&ex); 1113 idx = input_line_pointer - in->ptr; 1114 input_line_pointer = hold; 1115 1116 if (ex.X_op != O_constant) 1117 as_bad ("%s", emsg); 1118 1119 *val = ex.X_add_number; 1120 1121 return idx; 1122 } 1123 1124 /* Here to attempt 1 pass over each input file. 1126 We scan argv[*] looking for filenames or exactly "" which is 1127 shorthand for stdin. Any argv that is NULL is not a file-name. 1128 We set need_pass_2 TRUE if, after this, we still have unresolved 1129 expressions of the form (unknown value)+-(unknown value). 1130 1131 Note the un*x semantics: there is only 1 logical input file, but it 1132 may be a catenation of many 'physical' input files. */ 1133 1134 static void 1135 perform_an_assembly_pass (int argc, char ** argv) 1136 { 1137 int saw_a_file = 0; 1138 #ifndef OBJ_MACH_O 1139 flagword applicable; 1140 #endif 1141 1142 need_pass_2 = 0; 1143 1144 #ifndef OBJ_MACH_O 1145 /* Create the standard sections, and those the assembler uses 1146 internally. */ 1147 text_section = subseg_new (TEXT_SECTION_NAME, 0); 1148 data_section = subseg_new (DATA_SECTION_NAME, 0); 1149 bss_section = subseg_new (BSS_SECTION_NAME, 0); 1150 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed 1151 to have relocs, otherwise we don't find out in time. */ 1152 applicable = bfd_applicable_section_flags (stdoutput); 1153 bfd_set_section_flags (stdoutput, text_section, 1154 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC 1155 | SEC_CODE | SEC_READONLY)); 1156 bfd_set_section_flags (stdoutput, data_section, 1157 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC 1158 | SEC_DATA)); 1159 bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC); 1160 seg_info (bss_section)->bss = 1; 1161 #endif 1162 subseg_new (BFD_ABS_SECTION_NAME, 0); 1163 subseg_new (BFD_UND_SECTION_NAME, 0); 1164 reg_section = subseg_new ("*GAS `reg' section*", 0); 1165 expr_section = subseg_new ("*GAS `expr' section*", 0); 1166 1167 #ifndef OBJ_MACH_O 1168 subseg_set (text_section, 0); 1169 #endif 1170 1171 /* This may add symbol table entries, which requires having an open BFD, 1172 and sections already created. */ 1173 md_begin (); 1174 1175 #ifdef USING_CGEN 1176 gas_cgen_begin (); 1177 #endif 1178 #ifdef obj_begin 1179 obj_begin (); 1180 #endif 1181 1182 /* Skip argv[0]. */ 1183 argv++; 1184 argc--; 1185 1186 while (argc--) 1187 { 1188 if (*argv) 1189 { /* Is it a file-name argument? */ 1190 PROGRESS (1); 1191 saw_a_file++; 1192 /* argv->"" if stdin desired, else->filename. */ 1193 read_a_source_file (*argv); 1194 } 1195 argv++; /* Completed that argv. */ 1196 } 1197 if (!saw_a_file) 1198 read_a_source_file (""); 1199 } 1200 1201 1203 int 1204 main (int argc, char ** argv) 1205 { 1206 char ** argv_orig = argv; 1207 1208 int macro_strip_at; 1209 1210 start_time = get_run_time (); 1211 #ifdef HAVE_SBRK 1212 start_sbrk = (char *) sbrk (0); 1213 #endif 1214 1215 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES) 1216 setlocale (LC_MESSAGES, ""); 1217 #endif 1218 #if defined (HAVE_SETLOCALE) 1219 setlocale (LC_CTYPE, ""); 1220 #endif 1221 bindtextdomain (PACKAGE, LOCALEDIR); 1222 textdomain (PACKAGE); 1223 1224 if (debug_memory) 1225 chunksize = 64; 1226 1227 #ifdef HOST_SPECIAL_INIT 1228 HOST_SPECIAL_INIT (argc, argv); 1229 #endif 1230 1231 myname = argv[0]; 1232 xmalloc_set_program_name (myname); 1233 1234 expandargv (&argc, &argv); 1235 1236 START_PROGRESS (myname, 0); 1237 1238 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME 1239 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out" 1240 #endif 1241 1242 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME; 1243 1244 hex_init (); 1245 bfd_init (); 1246 bfd_set_error_program_name (myname); 1247 1248 #ifdef USE_EMULATIONS 1249 select_emulation_mode (argc, argv); 1250 #endif 1251 1252 PROGRESS (1); 1253 /* Call parse_args before any of the init/begin functions 1254 so that switches like --hash-size can be honored. */ 1255 parse_args (&argc, &argv); 1256 symbol_begin (); 1257 frag_init (); 1258 subsegs_begin (); 1259 read_begin (); 1260 input_scrub_begin (); 1261 expr_begin (); 1262 1263 /* It has to be called after dump_statistics (). */ 1264 xatexit (close_output_file); 1265 1266 if (flag_print_statistics) 1267 xatexit (dump_statistics); 1268 1269 macro_strip_at = 0; 1270 #ifdef TC_I960 1271 macro_strip_at = flag_mri; 1272 #endif 1273 1274 macro_init (flag_macro_alternate, flag_mri, macro_strip_at, macro_expr); 1275 1276 PROGRESS (1); 1277 1278 output_file_create (out_file_name); 1279 gas_assert (stdoutput != 0); 1280 1281 dot_symbol_init (); 1282 1283 #ifdef tc_init_after_args 1284 tc_init_after_args (); 1285 #endif 1286 1287 itbl_init (); 1288 1289 dwarf2_init (); 1290 1291 local_symbol_make (".gasversion.", absolute_section, 1292 BFD_VERSION / 10000UL, &predefined_address_frag); 1293 1294 /* Now that we have fully initialized, and have created the output 1295 file, define any symbols requested by --defsym command line 1296 arguments. */ 1297 while (defsyms != NULL) 1298 { 1299 symbolS *sym; 1300 struct defsym_list *next; 1301 1302 sym = symbol_new (defsyms->name, absolute_section, defsyms->value, 1303 &zero_address_frag); 1304 /* Make symbols defined on the command line volatile, so that they 1305 can be redefined inside a source file. This makes this assembler's 1306 behaviour compatible with earlier versions, but it may not be 1307 completely intuitive. */ 1308 S_SET_VOLATILE (sym); 1309 symbol_table_insert (sym); 1310 next = defsyms->next; 1311 free (defsyms); 1312 defsyms = next; 1313 } 1314 1315 PROGRESS (1); 1316 1317 /* Assemble it. */ 1318 perform_an_assembly_pass (argc, argv); 1319 1320 cond_finish_check (-1); 1321 1322 #ifdef md_end 1323 md_end (); 1324 #endif 1325 1326 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF 1327 if ((flag_execstack || flag_noexecstack) 1328 && OUTPUT_FLAVOR == bfd_target_elf_flavour) 1329 { 1330 segT gnustack; 1331 1332 gnustack = subseg_new (".note.GNU-stack", 0); 1333 bfd_set_section_flags (stdoutput, gnustack, 1334 SEC_READONLY | (flag_execstack ? SEC_CODE : 0)); 1335 1336 } 1337 #endif 1338 1339 /* If we've been collecting dwarf2 .debug_line info, either for 1340 assembly debugging or on behalf of the compiler, emit it now. */ 1341 dwarf2_finish (); 1342 1343 /* If we constructed dwarf2 .eh_frame info, either via .cfi 1344 directives from the user or by the backend, emit it now. */ 1345 cfi_finish (); 1346 1347 keep_it = 0; 1348 if (seen_at_least_1_file ()) 1349 { 1350 int n_warns, n_errs; 1351 char warn_msg[50]; 1352 char err_msg[50]; 1353 1354 write_object_file (); 1355 1356 n_warns = had_warnings (); 1357 n_errs = had_errors (); 1358 1359 if (n_warns == 1) 1360 sprintf (warn_msg, _("%d warning"), n_warns); 1361 else 1362 sprintf (warn_msg, _("%d warnings"), n_warns); 1363 if (n_errs == 1) 1364 sprintf (err_msg, _("%d error"), n_errs); 1365 else 1366 sprintf (err_msg, _("%d errors"), n_errs); 1367 1368 if (flag_fatal_warnings && n_warns != 0) 1369 { 1370 if (n_errs == 0) 1371 as_bad (_("%s, treating warnings as errors"), warn_msg); 1372 n_errs += n_warns; 1373 } 1374 1375 if (n_errs == 0) 1376 keep_it = 1; 1377 else if (flag_always_generate_output) 1378 { 1379 /* The -Z flag indicates that an object file should be generated, 1380 regardless of warnings and errors. */ 1381 keep_it = 1; 1382 fprintf (stderr, _("%s, %s, generating bad object file\n"), 1383 err_msg, warn_msg); 1384 } 1385 } 1386 1387 fflush (stderr); 1388 1389 #ifndef NO_LISTING 1390 listing_print (listing_filename, argv_orig); 1391 #endif 1392 1393 input_scrub_end (); 1394 1395 END_PROGRESS (myname); 1396 1397 /* Use xexit instead of return, because under VMS environments they 1398 may not place the same interpretation on the value given. */ 1399 if (had_errors () != 0) 1400 xexit (EXIT_FAILURE); 1401 1402 /* Only generate dependency file if assembler was successful. */ 1403 print_dependencies (); 1404 1405 xexit (EXIT_SUCCESS); 1406 } 1407
