gas/as.c

   1 /* as.c - GAS main program.
   2    Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
   4    2010, 2011, 2012, 2013
   5    Free Software Foundation, Inc.
   6
   7    This file is part of GAS, the GNU Assembler.
   8
   9    GAS 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 3, or (at your option)
  12    any later version.
  13
  14    GAS is distributed in the hope that it will be useful, but WITHOUT
  15    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  17    License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GAS; see the file COPYING.  If not, write to the Free
  21    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  22    02110-1301, USA.  */
  23
  24 /* Main program for AS; a 32-bit assembler of GNU.
  25    Understands command arguments.
  26    Has a few routines that don't fit in other modules because they
  27    are shared.
  28
  29                         bugs
  30
  31    : initialisers
  32         Since no-one else says they will support them in future: I
  33    don't support them now.  */
  34
  35 #define COMMON
  36
  37 #include "as.h"
  38 #include "subsegs.h"
  39 #include "output-file.h"
  40 #include "sb.h"
  41 #include "macro.h"
  42 #include "dwarf2dbg.h"
  43 #include "dw2gencfi.h"
  44 #include "bfdver.h"
  45
  46 #ifdef HAVE_ITBL_CPU
  47 #include "itbl-ops.h"
  48 #else
  49 #define itbl_init()
  50 #endif
  51
  52 #ifdef HAVE_SBRK
  53 #ifdef NEED_DECLARATION_SBRK
  54 extern void *sbrk ();
  55 #endif
  56 #endif
  57
  58 #ifdef USING_CGEN
  59 /* Perform any cgen specific initialisation for gas.  */
  60 extern void gas_cgen_begin (void);
  61 #endif
  62
  63 /* We build a list of defsyms as we read the options, and then define
  64    them after we have initialized everything.  */
  65 struct defsym_list
  66 {
  67   struct defsym_list *next;
  68   char *name;
  69   valueT value;
  70 };
  71
  72
  73 /* True if a listing is wanted.  */
  74 int listing;
  75
  76 /* Type of debugging to generate.  */
  77 enum debug_info_type debug_type = DEBUG_UNSPECIFIED;
  78 int use_gnu_debug_info_extensions = 0;
  79
  80 #ifndef MD_DEBUG_FORMAT_SELECTOR
  81 #define MD_DEBUG_FORMAT_SELECTOR NULL
  82 #endif
  83 static enum debug_info_type (*md_debug_format_selector) (int *) = MD_DEBUG_FORMAT_SELECTOR;
  84
  85 /* Maximum level of macro nesting.  */
  86 int max_macro_nest = 100;
  87
  88 /* argv[0]  */
  89 static char * myname;
  90
  91 /* The default obstack chunk size.  If we set this to zero, the
  92    obstack code will use whatever will fit in a 4096 byte block.  */
  93 int chunksize = 0;
  94
  95 /* To monitor memory allocation more effectively, make this non-zero.
  96    Then the chunk sizes for gas and bfd will be reduced.  */
  97 int debug_memory = 0;
  98
  99 /* Enable verbose mode.  */
 100 int verbose = 0;
 101
 102 /* Keep the output file.  */
 103 int keep_it = 0;
 104
 105 segT reg_section;
 106 segT expr_section;
 107 segT text_section;
 108 segT data_section;
 109 segT bss_section;
 110
 111 /* Name of listing file.  */
 112 static char *listing_filename = NULL;
 113
 114 static struct defsym_list *defsyms;
 115
 116 #ifdef HAVE_ITBL_CPU
 117 /* Keep a record of the itbl files we read in.  */
 118 struct itbl_file_list
 119 {
 120   struct itbl_file_list *next;
 121   char *name;
 122 };
 123 static struct itbl_file_list *itbl_files;
 124 #endif
 125
 126 static long start_time;
 127 #ifdef HAVE_SBRK
 128 char *start_sbrk;
 129 #endif
 130
 131 static int flag_macro_alternate;
 132
 133 \f
 134 #ifdef USE_EMULATIONS
 135 #define EMULATION_ENVIRON "AS_EMULATION"
 136
 137 extern struct emulation mipsbelf, mipslelf, mipself;
 138 extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
 139 extern struct emulation i386coff, i386elf, i386aout;
 140 extern struct emulation crisaout, criself;
 141
 142 static struct emulation *const emulations[] = { EMULATIONS };
 143 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
 144
 145 static void
 146 select_emulation_mode (int argc, char **argv)
 147 {
 148   int i;
 149   char *p, *em = 0;
 150
 151   for (i = 1; i < argc; i++)
 152     if (!strncmp ("--em", argv[i], 4))
 153       break;
 154
 155   if (i == argc)
 156     goto do_default;
 157
 158   p = strchr (argv[i], '=');
 159   if (p)
 160     p++;
 161   else
 162     p = argv[i + 1];
 163
 164   if (!p || !*p)
 165     as_fatal (_("missing emulation mode name"));
 166   em = p;
 167
 168  do_default:
 169   if (em == 0)
 170     em = getenv (EMULATION_ENVIRON);
 171   if (em == 0)
 172     em = DEFAULT_EMULATION;
 173
 174   if (em)
 175     {
 176       for (i = 0; i < n_emulations; i++)
 177         if (!strcmp (emulations[i]->name, em))
 178           break;
 179       if (i == n_emulations)
 180         as_fatal (_("unrecognized emulation name `%s'"), em);
 181       this_emulation = emulations[i];
 182     }
 183   else
 184     this_emulation = emulations[0];
 185
 186   this_emulation->init ();
 187 }
 188
 189 const char *
 190 default_emul_bfd_name (void)
 191 {
 192   abort ();
 193   return NULL;
 194 }
 195
 196 void
 197 common_emul_init (void)
 198 {
 199   this_format = this_emulation->format;
 200
 201   if (this_emulation->leading_underscore == 2)
 202     this_emulation->leading_underscore = this_format->dfl_leading_underscore;
 203
 204   if (this_emulation->default_endian != 2)
 205     target_big_endian = this_emulation->default_endian;
 206
 207   if (this_emulation->fake_label_name == 0)
 208     {
 209       if (this_emulation->leading_underscore)
 210         this_emulation->fake_label_name = "L0\001";
 211       else
 212         /* What other parameters should we test?  */
 213         this_emulation->fake_label_name = ".L0\001";
 214     }
 215 }
 216 #endif
 217
 218 void
 219 print_version_id (void)
 220 {
 221   static int printed;
 222
 223   if (printed)
 224     return;
 225   printed = 1;
 226
 227   fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s\n"),
 228            VERSION, TARGET_ALIAS, BFD_VERSION_STRING);
 229 }
 230
 231 static void
 232 show_usage (FILE * stream)
 233 {
 234   fprintf (stream, _("Usage: %s [option...] [asmfile...]\n"), myname);
 235
 236   fprintf (stream, _("\
 237 Options:\n\
 238   -a[sub-option...]       turn on listings\n\
 239                           Sub-options [default hls]:\n\
 240                           c      omit false conditionals\n\
 241                           d      omit debugging directives\n\
 242                           g      include general info\n\
 243                           h      include high-level source\n\
 244                           l      include assembly\n\
 245                           m      include macro expansions\n\
 246                           n      omit forms processing\n\
 247                           s      include symbols\n\
 248                           =FILE  list to FILE (must be last sub-option)\n"));
 249
 250   fprintf (stream, _("\
 251   --alternate             initially turn on alternate macro syntax\n"));
 252 #ifdef HAVE_ZLIB_H
 253   fprintf (stream, _("\
 254   --compress-debug-sections\n\
 255                           compress DWARF debug sections using zlib\n"));
 256   fprintf (stream, _("\
 257   --nocompress-debug-sections\n\
 258                           don't compress DWARF debug sections\n"));
 259 #endif /* HAVE_ZLIB_H */
 260   fprintf (stream, _("\
 261   -D                      produce assembler debugging messages\n"));
 262   fprintf (stream, _("\
 263   --debug-prefix-map OLD=NEW\n\
 264                           map OLD to NEW in debug information\n"));
 265   fprintf (stream, _("\
 266   --defsym SYM=VAL        define symbol SYM to given value\n"));
 267 #ifdef USE_EMULATIONS
 268   {
 269     int i;
 270     char *def_em;
 271
 272     fprintf (stream, "\
 273   --em=[");
 274     for (i = 0; i < n_emulations - 1; i++)
 275       fprintf (stream, "%s | ", emulations[i]->name);
 276     fprintf (stream, "%s]\n", emulations[i]->name);
 277
 278     def_em = getenv (EMULATION_ENVIRON);
 279     if (!def_em)
 280       def_em = DEFAULT_EMULATION;
 281     fprintf (stream, _("\
 282                           emulate output (default %s)\n"), def_em);
 283   }
 284 #endif
 285 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 286   fprintf (stream, _("\
 287   --execstack             require executable stack for this object\n"));
 288   fprintf (stream, _("\
 289   --noexecstack           don't require executable stack for this object\n"));
 290   fprintf (stream, _("\
 291   --size-check=[error|warning]\n\
 292                           ELF .size directive check (default --size-check=error)\n"));
 293 #endif
 294   fprintf (stream, _("\
 295   -f                      skip whitespace and comment preprocessing\n"));
 296   fprintf (stream, _("\
 297   -g --gen-debug          generate debugging information\n"));
 298   fprintf (stream, _("\
 299   --gstabs                generate STABS debugging information\n"));
 300   fprintf (stream, _("\
 301   --gstabs+               generate STABS debug info with GNU extensions\n"));
 302   fprintf (stream, _("\
 303   --gdwarf-2              generate DWARF2 debugging information\n"));
 304   fprintf (stream, _("\
 305   --hash-size=<value>     set the hash table size close to <value>\n"));
 306   fprintf (stream, _("\
 307   --help                  show this message and exit\n"));
 308   fprintf (stream, _("\
 309   --target-help           show target specific options\n"));
 310   fprintf (stream, _("\
 311   -I DIR                  add DIR to search list for .include directives\n"));
 312   fprintf (stream, _("\
 313   -J                      don't warn about signed overflow\n"));
 314   fprintf (stream, _("\
 315   -K                      warn when differences altered for long displacements\n"));
 316   fprintf (stream, _("\
 317   -L,--keep-locals        keep local symbols (e.g. starting with `L')\n"));
 318   fprintf (stream, _("\
 319   -M,--mri                assemble in MRI compatibility mode\n"));
 320   fprintf (stream, _("\
 321   --MD FILE               write dependency information in FILE (default none)\n"));
 322   fprintf (stream, _("\
 323   -nocpp                  ignored\n"));
 324   fprintf (stream, _("\
 325   -o OBJFILE              name the object-file output OBJFILE (default a.out)\n"));
 326   fprintf (stream, _("\
 327   -R                      fold data section into text section\n"));
 328   fprintf (stream, _("\
 329   --reduce-memory-overheads \n\
 330                           prefer smaller memory use at the cost of longer\n\
 331                           assembly times\n"));
 332   fprintf (stream, _("\
 333   --statistics            print various measured statistics from execution\n"));
 334   fprintf (stream, _("\
 335   --strip-local-absolute  strip local absolute symbols\n"));
 336   fprintf (stream, _("\
 337   --traditional-format    Use same format as native assembler when possible\n"));
 338   fprintf (stream, _("\
 339   --version               print assembler version number and exit\n"));
 340   fprintf (stream, _("\
 341   -W  --no-warn           suppress warnings\n"));
 342   fprintf (stream, _("\
 343   --warn                  don't suppress warnings\n"));
 344   fprintf (stream, _("\
 345   --fatal-warnings        treat warnings as errors\n"));
 346 #ifdef HAVE_ITBL_CPU
 347   fprintf (stream, _("\
 348   --itbl INSTTBL          extend instruction set to include instructions\n\
 349                           matching the specifications defined in file INSTTBL\n"));
 350 #endif
 351   fprintf (stream, _("\
 352   -w                      ignored\n"));
 353   fprintf (stream, _("\
 354   -X                      ignored\n"));
 355   fprintf (stream, _("\
 356   -Z                      generate object file even after errors\n"));
 357   fprintf (stream, _("\
 358   --listing-lhs-width     set the width in words of the output data column of\n\
 359                           the listing\n"));
 360   fprintf (stream, _("\
 361   --listing-lhs-width2    set the width in words of the continuation lines\n\
 362                           of the output data column; ignored if smaller than\n\
 363                           the width of the first line\n"));
 364   fprintf (stream, _("\
 365   --listing-rhs-width     set the max width in characters of the lines from\n\
 366                           the source file\n"));
 367   fprintf (stream, _("\
 368   --listing-cont-lines    set the maximum number of continuation lines used\n\
 369                           for the output data column of the listing\n"));
 370   fprintf (stream, _("\
 371   @FILE                   read options from FILE\n"));
 372
 373   md_show_usage (stream);
 374
 375   fputc ('\n', stream);
 376
 377   if (REPORT_BUGS_TO[0] && stream == stdout)
 378     fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
 379 }
 380
 381 /* Since it is easy to do here we interpret the special arg "-"
 382    to mean "use stdin" and we set that argv[] pointing to "".
 383    After we have munged argv[], the only things left are source file
 384    name(s) and ""(s) denoting stdin. These file names are used
 385    (perhaps more than once) later.
 386
 387    check for new machine-dep cmdline options in
 388    md_parse_option definitions in config/tc-*.c.  */
 389
 390 static void
 391 parse_args (int * pargc, char *** pargv)
 392 {
 393   int old_argc;
 394   int new_argc;
 395   char ** old_argv;
 396   char ** new_argv;
 397   /* Starting the short option string with '-' is for programs that
 398      expect options and other ARGV-elements in any order and that care about
 399      the ordering of the two.  We describe each non-option ARGV-element
 400      as if it were the argument of an option with character code 1.  */
 401   char *shortopts;
 402   extern const char *md_shortopts;
 403   static const char std_shortopts[] =
 404   {
 405     '-', 'J',
 406 #ifndef WORKING_DOT_WORD
 407     /* -K is not meaningful if .word is not being hacked.  */
 408     'K',
 409 #endif
 410     'L', 'M', 'R', 'W', 'Z', 'a', ':', ':', 'D', 'f', 'g', ':',':', 'I', ':', 'o', ':',
 411 #ifndef VMS
 412     /* -v takes an argument on VMS, so we don't make it a generic
 413        option.  */
 414     'v',
 415 #endif
 416     'w', 'X',
 417 #ifdef HAVE_ITBL_CPU
 418     /* New option for extending instruction set (see also --itbl below).  */
 419     't', ':',
 420 #endif
 421     '\0'
 422   };
 423   struct option *longopts;
 424   extern struct option md_longopts[];
 425   extern size_t md_longopts_size;
 426   /* Codes used for the long options with no short synonyms.  */
 427   enum option_values
 428     {
 429       OPTION_HELP = OPTION_STD_BASE,
 430       OPTION_NOCPP,
 431       OPTION_STATISTICS,
 432       OPTION_VERSION,
 433       OPTION_DUMPCONFIG,
 434       OPTION_VERBOSE,
 435       OPTION_EMULATION,
 436       OPTION_DEBUG_PREFIX_MAP,
 437       OPTION_DEFSYM,
 438       OPTION_LISTING_LHS_WIDTH,
 439       OPTION_LISTING_LHS_WIDTH2,
 440       OPTION_LISTING_RHS_WIDTH,
 441       OPTION_LISTING_CONT_LINES,
 442       OPTION_DEPFILE,
 443       OPTION_GSTABS,
 444       OPTION_GSTABS_PLUS,
 445       OPTION_GDWARF2,
 446       OPTION_STRIP_LOCAL_ABSOLUTE,
 447       OPTION_TRADITIONAL_FORMAT,
 448       OPTION_WARN,
 449       OPTION_TARGET_HELP,
 450       OPTION_EXECSTACK,
 451       OPTION_NOEXECSTACK,
 452       OPTION_SIZE_CHECK,
 453       OPTION_ALTERNATE,
 454       OPTION_AL,
 455       OPTION_HASH_TABLE_SIZE,
 456       OPTION_REDUCE_MEMORY_OVERHEADS,
 457       OPTION_WARN_FATAL,
 458       OPTION_COMPRESS_DEBUG,
 459       OPTION_NOCOMPRESS_DEBUG
 460     /* When you add options here, check that they do
 461        not collide with OPTION_MD_BASE.  See as.h.  */
 462     };
 463
 464   static const struct option std_longopts[] =
 465   {
 466     /* Note: commas are placed at the start of the line rather than
 467        the end of the preceding line so that it is simpler to
 468        selectively add and remove lines from this list.  */
 469     {"alternate", no_argument, NULL, OPTION_ALTERNATE}
 470     /* The entry for "a" is here to prevent getopt_long_only() from
 471        considering that -a is an abbreviation for --alternate.  This is
 472        necessary because -a=<FILE> is a valid switch but getopt would
 473        normally reject it since --alternate does not take an argument.  */
 474     ,{"a", optional_argument, NULL, 'a'}
 475     /* Handle -al=<FILE>.  */
 476     ,{"al", optional_argument, NULL, OPTION_AL}
 477     ,{"compress-debug-sections", no_argument, NULL, OPTION_COMPRESS_DEBUG}
 478     ,{"nocompress-debug-sections", no_argument, NULL, OPTION_NOCOMPRESS_DEBUG}
 479     ,{"debug-prefix-map", required_argument, NULL, OPTION_DEBUG_PREFIX_MAP}
 480     ,{"defsym", required_argument, NULL, OPTION_DEFSYM}
 481     ,{"dump-config", no_argument, NULL, OPTION_DUMPCONFIG}
 482     ,{"emulation", required_argument, NULL, OPTION_EMULATION}
 483 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 484     ,{"execstack", no_argument, NULL, OPTION_EXECSTACK}
 485     ,{"noexecstack", no_argument, NULL, OPTION_NOEXECSTACK}
 486     ,{"size-check", required_argument, NULL, OPTION_SIZE_CHECK}
 487 #endif
 488     ,{"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
 489     ,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF2}
 490     /* GCC uses --gdwarf-2 but GAS uses to use --gdwarf2,
 491        so we keep it here for backwards compatibility.  */
 492     ,{"gdwarf2", no_argument, NULL, OPTION_GDWARF2}
 493     ,{"gen-debug", no_argument, NULL, 'g'}
 494     ,{"gstabs", no_argument, NULL, OPTION_GSTABS}
 495     ,{"gstabs+", no_argument, NULL, OPTION_GSTABS_PLUS}
 496     ,{"hash-size", required_argument, NULL, OPTION_HASH_TABLE_SIZE}
 497     ,{"help", no_argument, NULL, OPTION_HELP}
 498 #ifdef HAVE_ITBL_CPU
 499     /* New option for extending instruction set (see also -t above).
 500        The "-t file" or "--itbl file" option extends the basic set of
 501        valid instructions by reading "file", a text file containing a
 502        list of instruction formats.  The additional opcodes and their
 503        formats are added to the built-in set of instructions, and
 504        mnemonics for new registers may also be defined.  */
 505     ,{"itbl", required_argument, NULL, 't'}
 506 #endif
 507     /* getopt allows abbreviations, so we do this to stop it from
 508        treating -k as an abbreviation for --keep-locals.  Some
 509        ports use -k to enable PIC assembly.  */
 510     ,{"keep-locals", no_argument, NULL, 'L'}
 511     ,{"keep-locals", no_argument, NULL, 'L'}
 512     ,{"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH}
 513     ,{"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2}
 514     ,{"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH}
 515     ,{"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES}
 516     ,{"MD", required_argument, NULL, OPTION_DEPFILE}
 517     ,{"mri", no_argument, NULL, 'M'}
 518     ,{"nocpp", no_argument, NULL, OPTION_NOCPP}
 519     ,{"no-warn", no_argument, NULL, 'W'}
 520     ,{"reduce-memory-overheads", no_argument, NULL, OPTION_REDUCE_MEMORY_OVERHEADS}
 521     ,{"statistics", no_argument, NULL, OPTION_STATISTICS}
 522     ,{"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE}
 523     ,{"version", no_argument, NULL, OPTION_VERSION}
 524     ,{"verbose", no_argument, NULL, OPTION_VERBOSE}
 525     ,{"target-help", no_argument, NULL, OPTION_TARGET_HELP}
 526     ,{"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT}
 527     ,{"warn", no_argument, NULL, OPTION_WARN}
 528   };
 529
 530   /* Construct the option lists from the standard list and the target
 531      dependent list.  Include space for an extra NULL option and
 532      always NULL terminate.  */
 533   shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
 534   longopts = (struct option *) xmalloc (sizeof (std_longopts)
 535                                         + md_longopts_size + sizeof (struct option));
 536   memcpy (longopts, std_longopts, sizeof (std_longopts));
 537   memcpy (((char *) longopts) + sizeof (std_longopts), md_longopts, md_longopts_size);
 538   memset (((char *) longopts) + sizeof (std_longopts) + md_longopts_size,
 539           0, sizeof (struct option));
 540
 541   /* Make a local copy of the old argv.  */
 542   old_argc = *pargc;
 543   old_argv = *pargv;
 544
 545   /* Initialize a new argv that contains no options.  */
 546   new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
 547   new_argv[0] = old_argv[0];
 548   new_argc = 1;
 549   new_argv[new_argc] = NULL;
 550
 551   while (1)
 552     {
 553       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 554          indicate a long option.  */
 555       int longind;
 556       int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
 557                                    &longind);
 558
 559       if (optc == -1)
 560         break;
 561
 562       switch (optc)
 563         {
 564         default:
 565           /* md_parse_option should return 1 if it recognizes optc,
 566              0 if not.  */
 567           if (md_parse_option (optc, optarg) != 0)
 568             break;
 569           /* `-v' isn't included in the general short_opts list, so check for
 570              it explicitly here before deciding we've gotten a bad argument.  */
 571           if (optc == 'v')
 572             {
 573 #ifdef VMS
 574               /* Telling getopt to treat -v's value as optional can result
 575                  in it picking up a following filename argument here.  The
 576                  VMS code in md_parse_option can return 0 in that case,
 577                  but it has no way of pushing the filename argument back.  */
 578               if (optarg && *optarg)
 579                 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
 580               else
 581 #else
 582               case 'v':
 583 #endif
 584               case OPTION_VERBOSE:
 585                 print_version_id ();
 586                 verbose = 1;
 587               break;
 588             }
 589           else
 590             as_bad (_("unrecognized option -%c%s"), optc, optarg ? optarg : "");
 591           /* Fall through.  */
 592
 593         case '?':
 594           exit (EXIT_FAILURE);
 595
 596         case 1:                 /* File name.  */
 597           if (!strcmp (optarg, "-"))
 598             optarg = "";
 599           new_argv[new_argc++] = optarg;
 600           new_argv[new_argc] = NULL;
 601           break;
 602
 603         case OPTION_TARGET_HELP:
 604           md_show_usage (stdout);
 605           exit (EXIT_SUCCESS);
 606
 607         case OPTION_HELP:
 608           show_usage (stdout);
 609           exit (EXIT_SUCCESS);
 610
 611         case OPTION_NOCPP:
 612           break;
 613
 614         case OPTION_STATISTICS:
 615           flag_print_statistics = 1;
 616           break;
 617
 618         case OPTION_STRIP_LOCAL_ABSOLUTE:
 619           flag_strip_local_absolute = 1;
 620           break;
 621
 622         case OPTION_TRADITIONAL_FORMAT:
 623           flag_traditional_format = 1;
 624           break;
 625
 626         case OPTION_VERSION:
 627           /* This output is intended to follow the GNU standards document.  */
 628           printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
 629           printf (_("Copyright 2013 Free Software Foundation, Inc.\n"));
 630           printf (_("\
 631 This program is free software; you may redistribute it under the terms of\n\
 632 the GNU General Public License version 3 or later.\n\
 633 This program has absolutely no warranty.\n"));
 634           printf (_("This assembler was configured for a target of `%s'.\n"),
 635                   TARGET_ALIAS);
 636           exit (EXIT_SUCCESS);
 637
 638         case OPTION_EMULATION:
 639 #ifdef USE_EMULATIONS
 640           if (strcmp (optarg, this_emulation->name))
 641             as_fatal (_("multiple emulation names specified"));
 642 #else
 643           as_fatal (_("emulations not handled in this configuration"));
 644 #endif
 645           break;
 646
 647         case OPTION_DUMPCONFIG:
 648           fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
 649           fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
 650           fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
 651 #ifdef TARGET_OBJ_FORMAT
 652           fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
 653 #endif
 654 #ifdef TARGET_FORMAT
 655           fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
 656 #endif
 657           exit (EXIT_SUCCESS);
 658
 659         case OPTION_COMPRESS_DEBUG:
 660 #ifdef HAVE_ZLIB_H
 661           flag_compress_debug = 1;
 662 #else
 663           as_warn (_("cannot compress debug sections (zlib not installed)"));
 664 #endif /* HAVE_ZLIB_H */
 665           break;
 666
 667         case OPTION_NOCOMPRESS_DEBUG:
 668           flag_compress_debug = 0;
 669           break;
 670
 671         case OPTION_DEBUG_PREFIX_MAP:
 672           add_debug_prefix_map (optarg);
 673           break;
 674
 675         case OPTION_DEFSYM:
 676           {
 677             char *s;
 678             valueT i;
 679             struct defsym_list *n;
 680
 681             for (s = optarg; *s != '\0' && *s != '='; s++)
 682               ;
 683             if (*s == '\0')
 684               as_fatal (_("bad defsym; format is --defsym name=value"));
 685             *s++ = '\0';
 686             i = bfd_scan_vma (s, (const char **) NULL, 0);
 687             n = (struct defsym_list *) xmalloc (sizeof *n);
 688             n->next = defsyms;
 689             n->name = optarg;
 690             n->value = i;
 691             defsyms = n;
 692           }
 693           break;
 694
 695 #ifdef HAVE_ITBL_CPU
 696         case 't':
 697           {
 698             /* optarg is the name of the file containing the instruction
 699                formats, opcodes, register names, etc.  */
 700             struct itbl_file_list *n;
 701
 702             if (optarg == NULL)
 703               {
 704                 as_warn (_("no file name following -t option"));
 705                 break;
 706               }
 707
 708             n = xmalloc (sizeof * n);
 709             n->next = itbl_files;
 710             n->name = optarg;
 711             itbl_files = n;
 712
 713             /* Parse the file and add the new instructions to our internal
 714                table.  If multiple instruction tables are specified, the
 715                information from this table gets appended onto the existing
 716                internal table.  */
 717             itbl_files->name = xstrdup (optarg);
 718             if (itbl_parse (itbl_files->name) != 0)
 719               as_fatal (_("failed to read instruction table %s\n"),
 720                         itbl_files->name);
 721           }
 722           break;
 723 #endif
 724
 725         case OPTION_DEPFILE:
 726           start_dependencies (optarg);
 727           break;
 728
 729         case 'g':
 730           /* Some backends, eg Alpha and Mips, use the -g switch for their
 731              own purposes.  So we check here for an explicit -g and allow
 732              the backend to decide if it wants to process it.  */
 733           if (   old_argv[optind - 1][1] == 'g'
 734               && md_parse_option (optc, optarg))
 735             continue;
 736
 737           if (md_debug_format_selector)
 738             debug_type = md_debug_format_selector (& use_gnu_debug_info_extensions);
 739           else if (IS_ELF)
 740             debug_type = DEBUG_DWARF2;
 741           else
 742             debug_type = DEBUG_STABS;
 743           break;
 744
 745         case OPTION_GSTABS_PLUS:
 746           use_gnu_debug_info_extensions = 1;
 747           /* Fall through.  */
 748         case OPTION_GSTABS:
 749           debug_type = DEBUG_STABS;
 750           break;
 751
 752         case OPTION_GDWARF2:
 753           debug_type = DEBUG_DWARF2;
 754           break;
 755
 756         case 'J':
 757           flag_signed_overflow_ok = 1;
 758           break;
 759
 760 #ifndef WORKING_DOT_WORD
 761         case 'K':
 762           flag_warn_displacement = 1;
 763           break;
 764 #endif
 765         case 'L':
 766           flag_keep_locals = 1;
 767           break;
 768
 769         case OPTION_LISTING_LHS_WIDTH:
 770           listing_lhs_width = atoi (optarg);
 771           if (listing_lhs_width_second < listing_lhs_width)
 772             listing_lhs_width_second = listing_lhs_width;
 773           break;
 774         case OPTION_LISTING_LHS_WIDTH2:
 775           {
 776             int tmp = atoi (optarg);
 777
 778             if (tmp > listing_lhs_width)
 779               listing_lhs_width_second = tmp;
 780           }
 781           break;
 782         case OPTION_LISTING_RHS_WIDTH:
 783           listing_rhs_width = atoi (optarg);
 784           break;
 785         case OPTION_LISTING_CONT_LINES:
 786           listing_lhs_cont_lines = atoi (optarg);
 787           break;
 788
 789         case 'M':
 790           flag_mri = 1;
 791 #ifdef TC_M68K
 792           flag_m68k_mri = 1;
 793 #endif
 794           break;
 795
 796         case 'R':
 797           flag_readonly_data_in_text = 1;
 798           break;
 799
 800         case 'W':
 801           flag_no_warnings = 1;
 802           break;
 803
 804         case OPTION_WARN:
 805           flag_no_warnings = 0;
 806           flag_fatal_warnings = 0;
 807           break;
 808
 809         case OPTION_WARN_FATAL:
 810           flag_no_warnings = 0;
 811           flag_fatal_warnings = 1;
 812           break;
 813
 814 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 815         case OPTION_EXECSTACK:
 816           flag_execstack = 1;
 817           flag_noexecstack = 0;
 818           break;
 819
 820         case OPTION_NOEXECSTACK:
 821           flag_noexecstack = 1;
 822           flag_execstack = 0;
 823           break;
 824
 825         case OPTION_SIZE_CHECK:
 826           if (strcasecmp (optarg, "error") == 0)
 827             flag_size_check = size_check_error;
 828           else if (strcasecmp (optarg, "warning") == 0)
 829             flag_size_check = size_check_warning;
 830           else
 831             as_fatal (_("Invalid --size-check= option: `%s'"), optarg);
 832           break;
 833 #endif
 834         case 'Z':
 835           flag_always_generate_output = 1;
 836           break;
 837
 838         case OPTION_AL:
 839           listing |= LISTING_LISTING;
 840           if (optarg)
 841             listing_filename = xstrdup (optarg);
 842           break;
 843
 844         case OPTION_ALTERNATE:
 845           optarg = old_argv [optind - 1];
 846           while (* optarg == '-')
 847             optarg ++;
 848
 849           if (strcmp (optarg, "alternate") == 0)
 850             {
 851               flag_macro_alternate = 1;
 852               break;
 853             }
 854           optarg ++;
 855           /* Fall through.  */
 856
 857         case 'a':
 858           if (optarg)
 859             {
 860               if (optarg != old_argv[optind] && optarg[-1] == '=')
 861                 --optarg;
 862
 863               if (md_parse_option (optc, optarg) != 0)
 864                 break;
 865
 866               while (*optarg)
 867                 {
 868                   switch (*optarg)
 869                     {
 870                     case 'c':
 871                       listing |= LISTING_NOCOND;
 872                       break;
 873                     case 'd':
 874                       listing |= LISTING_NODEBUG;
 875                       break;
 876                     case 'g':
 877                       listing |= LISTING_GENERAL;
 878                       break;
 879                     case 'h':
 880                       listing |= LISTING_HLL;
 881                       break;
 882                     case 'l':
 883                       listing |= LISTING_LISTING;
 884                       break;
 885                     case 'm':
 886                       listing |= LISTING_MACEXP;
 887                       break;
 888                     case 'n':
 889                       listing |= LISTING_NOFORM;
 890                       break;
 891                     case 's':
 892                       listing |= LISTING_SYMBOLS;
 893                       break;
 894                     case '=':
 895                       listing_filename = xstrdup (optarg + 1);
 896                       optarg += strlen (listing_filename);
 897                       break;
 898                     default:
 899                       as_fatal (_("invalid listing option `%c'"), *optarg);
 900                       break;
 901                     }
 902                   optarg++;
 903                 }
 904             }
 905           if (!listing)
 906             listing = LISTING_DEFAULT;
 907           break;
 908
 909         case 'D':
 910           /* DEBUG is implemented: it debugs different
 911              things from other people's assemblers.  */
 912           flag_debug = 1;
 913           break;
 914
 915         case 'f':
 916           flag_no_comments = 1;
 917           break;
 918
 919         case 'I':
 920           {                     /* Include file directory.  */
 921             char *temp = xstrdup (optarg);
 922
 923             add_include_dir (temp);
 924             break;
 925           }
 926
 927         case 'o':
 928           out_file_name = xstrdup (optarg);
 929           break;
 930
 931         case 'w':
 932           break;
 933
 934         case 'X':
 935           /* -X means treat warnings as errors.  */
 936           break;
 937
 938         case OPTION_REDUCE_MEMORY_OVERHEADS:
 939           /* The only change we make at the moment is to reduce
 940              the size of the hash tables that we use.  */
 941           set_gas_hash_table_size (4051);
 942           break;
 943
 944         case OPTION_HASH_TABLE_SIZE:
 945           {
 946             unsigned long new_size;
 947
 948             new_size = strtoul (optarg, NULL, 0);
 949             if (new_size)
 950               set_gas_hash_table_size (new_size);
 951             else
 952               as_fatal (_("--hash-size needs a numeric argument"));
 953             break;
 954           }
 955         }
 956     }
 957
 958   free (shortopts);
 959   free (longopts);
 960
 961   *pargc = new_argc;
 962   *pargv = new_argv;
 963
 964 #ifdef md_after_parse_args
 965   md_after_parse_args ();
 966 #endif
 967 }
 968
 969 static void
 970 dump_statistics (void)
 971 {
 972 #ifdef HAVE_SBRK
 973   char *lim = (char *) sbrk (0);
 974 #endif
 975   long run_time = get_run_time () - start_time;
 976
 977   fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
 978            myname, run_time / 1000000, run_time % 1000000);
 979 #ifdef HAVE_SBRK
 980   fprintf (stderr, _("%s: data size %ld\n"),
 981            myname, (long) (lim - start_sbrk));
 982 #endif
 983
 984   subsegs_print_statistics (stderr);
 985   write_print_statistics (stderr);
 986   symbol_print_statistics (stderr);
 987   read_print_statistics (stderr);
 988
 989 #ifdef tc_print_statistics
 990   tc_print_statistics (stderr);
 991 #endif
 992
 993 #ifdef obj_print_statistics
 994   obj_print_statistics (stderr);
 995 #endif
 996 }
 997
 998 static void
 999 close_output_file (void)
1000 {
1001   output_file_close (out_file_name);
1002   if (!keep_it)
1003     unlink_if_ordinary (out_file_name);
1004 }
1005
1006 /* The interface between the macro code and gas expression handling.  */
1007
1008 static size_t
1009 macro_expr (const char *emsg, size_t idx, sb *in, offsetT *val)
1010 {
1011   char *hold;
1012   expressionS ex;
1013
1014   sb_terminate (in);
1015
1016   hold = input_line_pointer;
1017   input_line_pointer = in->ptr + idx;
1018   expression_and_evaluate (&ex);
1019   idx = input_line_pointer - in->ptr;
1020   input_line_pointer = hold;
1021
1022   if (ex.X_op != O_constant)
1023     as_bad ("%s", emsg);
1024
1025   *val = ex.X_add_number;
1026
1027   return idx;
1028 }
1029 \f
1030 /* Here to attempt 1 pass over each input file.
1031    We scan argv[*] looking for filenames or exactly "" which is
1032    shorthand for stdin. Any argv that is NULL is not a file-name.
1033    We set need_pass_2 TRUE if, after this, we still have unresolved
1034    expressions of the form (unknown value)+-(unknown value).
1035
1036    Note the un*x semantics: there is only 1 logical input file, but it
1037    may be a catenation of many 'physical' input files.  */
1038
1039 static void
1040 perform_an_assembly_pass (int argc, char ** argv)
1041 {
1042   int saw_a_file = 0;
1043 #ifndef OBJ_MACH_O
1044   flagword applicable;
1045 #endif
1046
1047   need_pass_2 = 0;
1048
1049 #ifndef OBJ_MACH_O
1050   /* Create the standard sections, and those the assembler uses
1051      internally.  */
1052   text_section = subseg_new (TEXT_SECTION_NAME, 0);
1053   data_section = subseg_new (DATA_SECTION_NAME, 0);
1054   bss_section = subseg_new (BSS_SECTION_NAME, 0);
1055   /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1056      to have relocs, otherwise we don't find out in time.  */
1057   applicable = bfd_applicable_section_flags (stdoutput);
1058   bfd_set_section_flags (stdoutput, text_section,
1059                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1060                                        | SEC_CODE | SEC_READONLY));
1061   bfd_set_section_flags (stdoutput, data_section,
1062                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1063                                        | SEC_DATA));
1064   bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1065   seg_info (bss_section)->bss = 1;
1066 #endif
1067   subseg_new (BFD_ABS_SECTION_NAME, 0);
1068   subseg_new (BFD_UND_SECTION_NAME, 0);
1069   reg_section = subseg_new ("*GAS `reg' section*", 0);
1070   expr_section = subseg_new ("*GAS `expr' section*", 0);
1071
1072 #ifndef OBJ_MACH_O
1073   subseg_set (text_section, 0);
1074 #endif
1075
1076   /* This may add symbol table entries, which requires having an open BFD,
1077      and sections already created.  */
1078   md_begin ();
1079
1080 #ifdef USING_CGEN
1081   gas_cgen_begin ();
1082 #endif
1083 #ifdef obj_begin
1084   obj_begin ();
1085 #endif
1086
1087   /* Skip argv[0].  */
1088   argv++;
1089   argc--;
1090
1091   while (argc--)
1092     {
1093       if (*argv)
1094         {                       /* Is it a file-name argument?  */
1095           PROGRESS (1);
1096           saw_a_file++;
1097           /* argv->"" if stdin desired, else->filename.  */
1098           read_a_source_file (*argv);
1099         }
1100       argv++;                   /* Completed that argv.  */
1101     }
1102   if (!saw_a_file)
1103     read_a_source_file ("");
1104 }
1105 \f
1106 #ifdef OBJ_ELF
1107 static void
1108 create_obj_attrs_section (void)
1109 {
1110   segT s;
1111   char *p;
1112   offsetT size;
1113   const char *name;
1114
1115   size = bfd_elf_obj_attr_size (stdoutput);
1116   if (size)
1117     {
1118       name = get_elf_backend_data (stdoutput)->obj_attrs_section;
1119       if (!name)
1120         name = ".gnu.attributes";
1121       s = subseg_new (name, 0);
1122       elf_section_type (s)
1123         = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
1124       bfd_set_section_flags (stdoutput, s, SEC_READONLY | SEC_DATA);
1125       frag_now_fix ();
1126       p = frag_more (size);
1127       bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
1128     }
1129 }
1130 #endif
1131 \f
1132
1133 int
1134 main (int argc, char ** argv)
1135 {
1136   char ** argv_orig = argv;
1137
1138   int macro_strip_at;
1139
1140   start_time = get_run_time ();
1141 #ifdef HAVE_SBRK
1142   start_sbrk = (char *) sbrk (0);
1143 #endif
1144
1145 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
1146   setlocale (LC_MESSAGES, "");
1147 #endif
1148 #if defined (HAVE_SETLOCALE)
1149   setlocale (LC_CTYPE, "");
1150 #endif
1151   bindtextdomain (PACKAGE, LOCALEDIR);
1152   textdomain (PACKAGE);
1153
1154   if (debug_memory)
1155     chunksize = 64;
1156
1157 #ifdef HOST_SPECIAL_INIT
1158   HOST_SPECIAL_INIT (argc, argv);
1159 #endif
1160
1161   myname = argv[0];
1162   xmalloc_set_program_name (myname);
1163
1164   expandargv (&argc, &argv);
1165
1166   START_PROGRESS (myname, 0);
1167
1168 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
1169 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
1170 #endif
1171
1172   out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
1173
1174   hex_init ();
1175   bfd_init ();
1176   bfd_set_error_program_name (myname);
1177
1178 #ifdef USE_EMULATIONS
1179   select_emulation_mode (argc, argv);
1180 #endif
1181
1182   PROGRESS (1);
1183   /* Call parse_args before any of the init/begin functions
1184      so that switches like --hash-size can be honored.  */
1185   parse_args (&argc, &argv);
1186   symbol_begin ();
1187   frag_init ();
1188   subsegs_begin ();
1189   read_begin ();
1190   input_scrub_begin ();
1191   expr_begin ();
1192
1193   /* It has to be called after dump_statistics ().  */
1194   xatexit (close_output_file);
1195
1196   if (flag_print_statistics)
1197     xatexit (dump_statistics);
1198
1199   macro_strip_at = 0;
1200 #ifdef TC_I960
1201   macro_strip_at = flag_mri;
1202 #endif
1203
1204   macro_init (flag_macro_alternate, flag_mri, macro_strip_at, macro_expr);
1205
1206   PROGRESS (1);
1207
1208   output_file_create (out_file_name);
1209   gas_assert (stdoutput != 0);
1210
1211   dot_symbol_init ();
1212
1213 #ifdef tc_init_after_args
1214   tc_init_after_args ();
1215 #endif
1216
1217   itbl_init ();
1218
1219   dwarf2_init ();
1220
1221   local_symbol_make (".gasversion.", absolute_section,
1222                      BFD_VERSION / 10000UL, &predefined_address_frag);
1223
1224   /* Now that we have fully initialized, and have created the output
1225      file, define any symbols requested by --defsym command line
1226      arguments.  */
1227   while (defsyms != NULL)
1228     {
1229       symbolS *sym;
1230       struct defsym_list *next;
1231
1232       sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
1233                         &zero_address_frag);
1234       /* Make symbols defined on the command line volatile, so that they
1235          can be redefined inside a source file.  This makes this assembler's
1236          behaviour compatible with earlier versions, but it may not be
1237          completely intuitive.  */
1238       S_SET_VOLATILE (sym);
1239       symbol_table_insert (sym);
1240       next = defsyms->next;
1241       free (defsyms);
1242       defsyms = next;
1243     }
1244
1245   PROGRESS (1);
1246
1247   /* Assemble it.  */
1248   perform_an_assembly_pass (argc, argv);
1249
1250   cond_finish_check (-1);
1251
1252 #ifdef md_end
1253   md_end ();
1254 #endif
1255
1256 #ifdef OBJ_ELF
1257   if (IS_ELF)
1258     create_obj_attrs_section ();
1259 #endif
1260
1261 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
1262   if ((flag_execstack || flag_noexecstack)
1263       && OUTPUT_FLAVOR == bfd_target_elf_flavour)
1264     {
1265       segT gnustack;
1266
1267       gnustack = subseg_new (".note.GNU-stack", 0);
1268       bfd_set_section_flags (stdoutput, gnustack,
1269                              SEC_READONLY | (flag_execstack ? SEC_CODE : 0));
1270
1271     }
1272 #endif
1273
1274   /* If we've been collecting dwarf2 .debug_line info, either for
1275      assembly debugging or on behalf of the compiler, emit it now.  */
1276   dwarf2_finish ();
1277
1278   /* If we constructed dwarf2 .eh_frame info, either via .cfi
1279      directives from the user or by the backend, emit it now.  */
1280   cfi_finish ();
1281
1282   if (seen_at_least_1_file ()
1283       && (flag_always_generate_output || had_errors () == 0))
1284     keep_it = 1;
1285   else
1286     keep_it = 0;
1287
1288   /* This used to be done at the start of write_object_file in
1289      write.c, but that caused problems when doing listings when
1290      keep_it was zero.  This could probably be moved above md_end, but
1291      I didn't want to risk the change.  */
1292   subsegs_finish ();
1293
1294   if (keep_it)
1295     write_object_file ();
1296
1297   fflush (stderr);
1298
1299 #ifndef NO_LISTING
1300   listing_print (listing_filename, argv_orig);
1301 #endif
1302
1303   if (flag_fatal_warnings && had_warnings () > 0 && had_errors () == 0)
1304     as_bad (_("%d warnings, treating warnings as errors"), had_warnings ());
1305
1306   if (had_errors () > 0 && ! flag_always_generate_output)
1307     keep_it = 0;
1308
1309   input_scrub_end ();
1310
1311   END_PROGRESS (myname);
1312
1313   /* Use xexit instead of return, because under VMS environments they
1314      may not place the same interpretation on the value given.  */
1315   if (had_errors () > 0)
1316     xexit (EXIT_FAILURE);
1317
1318   /* Only generate dependency file if assembler was successful.  */
1319   print_dependencies ();
1320
1321   xexit (EXIT_SUCCESS);
1322 }