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
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21    02111-1307, USA.  */
  22
  23 /* Main program for AS; a 32-bit assembler of GNU.
  24  * Understands command arguments.
  25  * Has a few routines that don't fit in other modules because they
  26  * are shared.
  27  *
  28  *                      bugs
  29  *
  30  * : initialisers
  31  *      Since no-one else says they will support them in future: I
  32  * don't support them now.
  33  */
  34
  35 #include "ansidecl.h"
  36
  37 #define COMMON
  38
  39 #include "as.h"
  40 #include "subsegs.h"
  41 #include "output-file.h"
  42 #include "sb.h"
  43 #include "macro.h"
  44 #include "dwarf2dbg.h"
  45 #include "dw2gencfi.h"
  46
  47 #ifdef BFD_ASSEMBLER
  48 #include "bfdver.h"
  49 #endif
  50
  51 #ifdef HAVE_ITBL_CPU
  52 #include "itbl-ops.h"
  53 #else
  54 #define itbl_parse(itbl_file) 1
  55 #define itbl_init()
  56 #endif
  57
  58 #ifdef HAVE_SBRK
  59 #ifdef NEED_DECLARATION_SBRK
  60 extern PTR sbrk ();
  61 #endif
  62 #endif
  63
  64 static void show_usage PARAMS ((FILE *));
  65 static void parse_args PARAMS ((int *, char ***));
  66 static void dump_statistics PARAMS ((void));
  67 static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
  68 static int macro_expr PARAMS ((const char *, int, sb *, int *));
  69 #ifdef USING_CGEN
  70 /* Perform any cgen specific initialisation for gas.  */
  71 extern void gas_cgen_begin PARAMS ((void));
  72 #endif
  73
  74 /* True if a listing is wanted.  */
  75 int listing;
  76
  77 /* Name of listing file.  */
  78 static char *listing_filename = NULL;
  79
  80 /* Type of debugging to generate.  */
  81
  82 enum debug_info_type debug_type = DEBUG_UNSPECIFIED;
  83
  84 /* Maximum level of macro nesting.  */
  85 int max_macro_nest = 100;
  86
  87 /* argv[0]  */
  88 char *myname;
  89 #ifdef BFD_ASSEMBLER
  90 segT reg_section, expr_section;
  91 segT text_section, data_section, bss_section;
  92 #endif
  93
  94 /* The default obstack chunk size.  If we set this to zero, the
  95    obstack code will use whatever will fit in a 4096 byte block.  */
  96 int chunksize = 0;
  97
  98 /* To monitor memory allocation more effectively, make this non-zero.
  99    Then the chunk sizes for gas and bfd will be reduced.  */
 100 int debug_memory = 0;
 101
 102 /* Enable verbose mode.  */
 103 int verbose = 0;
 104
 105 /* We build a list of defsyms as we read the options, and then define
 106    them after we have initialized everything.  */
 107
 108 struct defsym_list {
 109   struct defsym_list *next;
 110   char *name;
 111   valueT value;
 112 };
 113
 114 static struct defsym_list *defsyms;
 115
 116 /* Keep a record of the itbl files we read in.  */
 117
 118 struct itbl_file_list {
 119   struct itbl_file_list *next;
 120   char *name;
 121 };
 122
 123 static struct itbl_file_list *itbl_files;
 124 \f
 125 #ifdef USE_EMULATIONS
 126 #define EMULATION_ENVIRON "AS_EMULATION"
 127
 128 extern struct emulation mipsbelf, mipslelf, mipself;
 129 extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
 130 extern struct emulation i386coff, i386elf, i386aout;
 131 extern struct emulation crisaout, criself;
 132
 133 static struct emulation *const emulations[] = { EMULATIONS };
 134 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
 135
 136 static void select_emulation_mode PARAMS ((int, char **));
 137
 138 static void
 139 select_emulation_mode (argc, argv)
 140      int argc;
 141      char **argv;
 142 {
 143   int i;
 144   char *p, *em = 0;
 145
 146   for (i = 1; i < argc; i++)
 147     if (!strncmp ("--em", argv[i], 4))
 148       break;
 149
 150   if (i == argc)
 151     goto do_default;
 152
 153   p = strchr (argv[i], '=');
 154   if (p)
 155     p++;
 156   else
 157     p = argv[i + 1];
 158
 159   if (!p || !*p)
 160     as_fatal (_("missing emulation mode name"));
 161   em = p;
 162
 163  do_default:
 164   if (em == 0)
 165     em = getenv (EMULATION_ENVIRON);
 166   if (em == 0)
 167     em = DEFAULT_EMULATION;
 168
 169   if (em)
 170     {
 171       for (i = 0; i < n_emulations; i++)
 172         if (!strcmp (emulations[i]->name, em))
 173           break;
 174       if (i == n_emulations)
 175         as_fatal (_("unrecognized emulation name `%s'"), em);
 176       this_emulation = emulations[i];
 177     }
 178   else
 179     this_emulation = emulations[0];
 180
 181   this_emulation->init ();
 182 }
 183
 184 const char *
 185 default_emul_bfd_name ()
 186 {
 187   abort ();
 188   return NULL;
 189 }
 190
 191 void
 192 common_emul_init ()
 193 {
 194   this_format = this_emulation->format;
 195
 196   if (this_emulation->leading_underscore == 2)
 197     this_emulation->leading_underscore = this_format->dfl_leading_underscore;
 198
 199   if (this_emulation->default_endian != 2)
 200     target_big_endian = this_emulation->default_endian;
 201
 202   if (this_emulation->fake_label_name == 0)
 203     {
 204       if (this_emulation->leading_underscore)
 205         this_emulation->fake_label_name = "L0\001";
 206       else
 207         /* What other parameters should we test?  */
 208         this_emulation->fake_label_name = ".L0\001";
 209     }
 210 }
 211 #endif
 212
 213 void
 214 print_version_id ()
 215 {
 216   static int printed;
 217   if (printed)
 218     return;
 219   printed = 1;
 220
 221 #ifdef BFD_ASSEMBLER
 222   fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s"),
 223            VERSION, TARGET_ALIAS, BFD_VERSION_STRING);
 224 #else
 225   fprintf (stderr, _("GNU assembler version %s (%s)"), VERSION, TARGET_ALIAS);
 226 #endif
 227   fprintf (stderr, "\n");
 228 }
 229
 230 static void
 231 show_usage (stream)
 232      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                           h      include high-level source\n\
 243                           l      include assembly\n\
 244                           m      include macro expansions\n\
 245                           n      omit forms processing\n\
 246                           s      include symbols\n\
 247                           =FILE  list to FILE (must be last sub-option)\n"));
 248
 249   fprintf (stream, _("\
 250   -D                      produce assembler debugging messages\n"));
 251   fprintf (stream, _("\
 252   --defsym SYM=VAL        define symbol SYM to given value\n"));
 253 #ifdef USE_EMULATIONS
 254   {
 255     int i;
 256     char *def_em;
 257
 258     fprintf (stream, "\
 259   --em=[");
 260     for (i = 0; i < n_emulations - 1; i++)
 261       fprintf (stream, "%s | ", emulations[i]->name);
 262     fprintf (stream, "%s]\n", emulations[i]->name);
 263
 264     def_em = getenv (EMULATION_ENVIRON);
 265     if (!def_em)
 266       def_em = DEFAULT_EMULATION;
 267     fprintf (stream, _("\
 268                           emulate output (default %s)\n"), def_em);
 269   }
 270 #endif
 271 #if defined BFD_ASSEMBLER && (defined OBJ_ELF || defined OBJ_MAYBE_ELF)
 272   fprintf (stream, _("\
 273   --execstack             require executable stack for this object\n"));
 274   fprintf (stream, _("\
 275   --noexecstack           don't require executable stack for this object\n"));
 276 #endif
 277   fprintf (stream, _("\
 278   -f                      skip whitespace and comment preprocessing\n"));
 279   fprintf (stream, _("\
 280   --gstabs                generate stabs debugging information\n"));
 281   fprintf (stream, _("\
 282   --gdwarf2               generate DWARF2 debugging information\n"));
 283   fprintf (stream, _("\
 284   --help                  show this message and exit\n"));
 285   fprintf (stream, _("\
 286   --target-help           show target specific options\n"));
 287   fprintf (stream, _("\
 288   -I DIR                  add DIR to search list for .include directives\n"));
 289   fprintf (stream, _("\
 290   -J                      don't warn about signed overflow\n"));
 291   fprintf (stream, _("\
 292   -K                      warn when differences altered for long displacements\n"));
 293   fprintf (stream, _("\
 294   -L,--keep-locals        keep local symbols (e.g. starting with `L')\n"));
 295   fprintf (stream, _("\
 296   -M,--mri                assemble in MRI compatibility mode\n"));
 297   fprintf (stream, _("\
 298   --MD FILE               write dependency information in FILE (default none)\n"));
 299   fprintf (stream, _("\
 300   -nocpp                  ignored\n"));
 301   fprintf (stream, _("\
 302   -o OBJFILE              name the object-file output OBJFILE (default a.out)\n"));
 303   fprintf (stream, _("\
 304   -R                      fold data section into text section\n"));
 305   fprintf (stream, _("\
 306   --statistics            print various measured statistics from execution\n"));
 307   fprintf (stream, _("\
 308   --strip-local-absolute  strip local absolute symbols\n"));
 309   fprintf (stream, _("\
 310   --traditional-format    Use same format as native assembler when possible\n"));
 311   fprintf (stream, _("\
 312   --version               print assembler version number and exit\n"));
 313   fprintf (stream, _("\
 314   -W  --no-warn           suppress warnings\n"));
 315   fprintf (stream, _("\
 316   --warn                  don't suppress warnings\n"));
 317   fprintf (stream, _("\
 318   --fatal-warnings        treat warnings as errors\n"));
 319   fprintf (stream, _("\
 320   --itbl INSTTBL          extend instruction set to include instructions\n\
 321                           matching the specifications defined in file INSTTBL\n"));
 322   fprintf (stream, _("\
 323   -w                      ignored\n"));
 324   fprintf (stream, _("\
 325   -X                      ignored\n"));
 326   fprintf (stream, _("\
 327   -Z                      generate object file even after errors\n"));
 328   fprintf (stream, _("\
 329   --listing-lhs-width     set the width in words of the output data column of\n\
 330                           the listing\n"));
 331   fprintf (stream, _("\
 332   --listing-lhs-width2    set the width in words of the continuation lines\n\
 333                           of the output data column; ignored if smaller than\n\
 334                           the width of the first line\n"));
 335   fprintf (stream, _("\
 336   --listing-rhs-width     set the max width in characters of the lines from\n\
 337                           the source file\n"));
 338   fprintf (stream, _("\
 339   --listing-cont-lines    set the maximum number of continuation lines used\n\
 340                           for the output data column of the listing\n"));
 341
 342   md_show_usage (stream);
 343
 344   fputc ('\n', stream);
 345   fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
 346 }
 347
 348 /* Since it is easy to do here we interpret the special arg "-"
 349    to mean "use stdin" and we set that argv[] pointing to "".
 350    After we have munged argv[], the only things left are source file
 351    name(s) and ""(s) denoting stdin. These file names are used
 352    (perhaps more than once) later.
 353
 354    check for new machine-dep cmdline options in
 355    md_parse_option definitions in config/tc-*.c.  */
 356
 357 static void
 358 parse_args (pargc, pargv)
 359      int *pargc;
 360      char ***pargv;
 361 {
 362   int old_argc, new_argc;
 363   char **old_argv, **new_argv;
 364
 365   /* Starting the short option string with '-' is for programs that
 366      expect options and other ARGV-elements in any order and that care about
 367      the ordering of the two.  We describe each non-option ARGV-element
 368      as if it were the argument of an option with character code 1.  */
 369
 370   char *shortopts;
 371   extern const char *md_shortopts;
 372   static const char std_shortopts[] = {
 373     '-', 'J',
 374 #ifndef WORKING_DOT_WORD
 375     /* -K is not meaningful if .word is not being hacked.  */
 376     'K',
 377 #endif
 378     'L', 'M', 'R', 'W', 'Z', 'f', 'a', ':', ':', 'D', 'I', ':', 'o', ':',
 379 #ifndef VMS
 380     /* -v takes an argument on VMS, so we don't make it a generic
 381        option.  */
 382     'v',
 383 #endif
 384     'w', 'X',
 385     /* New option for extending instruction set (see also --itbl below)  */
 386     't', ':',
 387     '\0'
 388   };
 389   struct option *longopts;
 390   extern struct option md_longopts[];
 391   extern size_t md_longopts_size;
 392   static const struct option std_longopts[] = {
 393 #define OPTION_HELP (OPTION_STD_BASE)
 394     {"help", no_argument, NULL, OPTION_HELP},
 395     /* getopt allows abbreviations, so we do this to stop it from
 396        treating -k as an abbreviation for --keep-locals.  Some
 397        ports use -k to enable PIC assembly.  */
 398     {"keep-locals", no_argument, NULL, 'L'},
 399     {"keep-locals", no_argument, NULL, 'L'},
 400     {"mri", no_argument, NULL, 'M'},
 401 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
 402     {"nocpp", no_argument, NULL, OPTION_NOCPP},
 403 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
 404     {"statistics", no_argument, NULL, OPTION_STATISTICS},
 405 #define OPTION_VERSION (OPTION_STD_BASE + 3)
 406     {"version", no_argument, NULL, OPTION_VERSION},
 407 #define OPTION_DUMPCONFIG (OPTION_STD_BASE + 4)
 408     {"dump-config", no_argument, NULL, OPTION_DUMPCONFIG},
 409 #define OPTION_VERBOSE (OPTION_STD_BASE + 5)
 410     {"verbose", no_argument, NULL, OPTION_VERBOSE},
 411 #define OPTION_EMULATION (OPTION_STD_BASE + 6)
 412     {"emulation", required_argument, NULL, OPTION_EMULATION},
 413 #define OPTION_DEFSYM (OPTION_STD_BASE + 7)
 414     {"defsym", required_argument, NULL, OPTION_DEFSYM},
 415 #define OPTION_INSTTBL (OPTION_STD_BASE + 8)
 416     /* New option for extending instruction set (see also -t above).
 417        The "-t file" or "--itbl file" option extends the basic set of
 418        valid instructions by reading "file", a text file containing a
 419        list of instruction formats.  The additional opcodes and their
 420        formats are added to the built-in set of instructions, and
 421        mnemonics for new registers may also be defined.  */
 422     {"itbl", required_argument, NULL, OPTION_INSTTBL},
 423 #define OPTION_LISTING_LHS_WIDTH (OPTION_STD_BASE + 9)
 424     {"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH},
 425 #define OPTION_LISTING_LHS_WIDTH2 (OPTION_STD_BASE + 10)
 426     {"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2},
 427 #define OPTION_LISTING_RHS_WIDTH (OPTION_STD_BASE + 11)
 428     {"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH},
 429 #define OPTION_LISTING_CONT_LINES (OPTION_STD_BASE + 12)
 430     {"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES},
 431 #define OPTION_DEPFILE (OPTION_STD_BASE + 13)
 432     {"MD", required_argument, NULL, OPTION_DEPFILE},
 433 #define OPTION_GSTABS (OPTION_STD_BASE + 14)
 434     {"gstabs", no_argument, NULL, OPTION_GSTABS},
 435 #define OPTION_STRIP_LOCAL_ABSOLUTE (OPTION_STD_BASE + 15)
 436     {"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE},
 437 #define OPTION_TRADITIONAL_FORMAT (OPTION_STD_BASE + 16)
 438     {"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT},
 439 #define OPTION_GDWARF2 (OPTION_STD_BASE + 17)
 440     {"gdwarf2", no_argument, NULL, OPTION_GDWARF2},
 441     {"no-warn", no_argument, NULL, 'W'},
 442 #define OPTION_WARN (OPTION_STD_BASE + 18)
 443     {"warn", no_argument, NULL, OPTION_WARN},
 444 #define OPTION_TARGET_HELP (OPTION_STD_BASE + 19)
 445     {"target-help", no_argument, NULL, OPTION_TARGET_HELP},
 446 #if defined BFD_ASSEMBLER && (defined OBJ_ELF || defined OBJ_MAYBE_ELF)
 447 #define OPTION_EXECSTACK (OPTION_STD_BASE + 20)
 448     {"execstack", no_argument, NULL, OPTION_EXECSTACK},
 449 #define OPTION_NOEXECSTACK (OPTION_STD_BASE + 21)
 450     {"noexecstack", no_argument, NULL, OPTION_NOEXECSTACK},
 451 #endif
 452 #define OPTION_WARN_FATAL (OPTION_STD_BASE + 22)
 453     {"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
 454     /* When you add options here, check that they do not collide with
 455        OPTION_MD_BASE.  See as.h.  */
 456   };
 457
 458   /* Construct the option lists from the standard list and the target
 459      dependent list.  Include space for an extra NULL option and
 460      always NULL terminate.  */
 461   shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
 462   longopts = (struct option *) xmalloc (sizeof (std_longopts)
 463                                         + md_longopts_size
 464                                         + sizeof (struct option));
 465   memcpy (longopts, std_longopts, sizeof (std_longopts));
 466   memcpy ((char *) longopts + sizeof (std_longopts),
 467           md_longopts, md_longopts_size);
 468   memset ((char *) longopts + sizeof (std_longopts) + md_longopts_size,
 469           0, sizeof (struct option));
 470
 471   /* Make a local copy of the old argv.  */
 472   old_argc = *pargc;
 473   old_argv = *pargv;
 474
 475   /* Initialize a new argv that contains no options.  */
 476   new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
 477   new_argv[0] = old_argv[0];
 478   new_argc = 1;
 479   new_argv[new_argc] = NULL;
 480
 481   while (1)
 482     {
 483       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 484          indicate a long option.  */
 485       int longind;
 486       int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
 487                                    &longind);
 488
 489       if (optc == -1)
 490         break;
 491
 492       switch (optc)
 493         {
 494         default:
 495           /* md_parse_option should return 1 if it recognizes optc,
 496              0 if not.  */
 497           if (md_parse_option (optc, optarg) != 0)
 498             break;
 499           /* `-v' isn't included in the general short_opts list, so check for
 500              it explicity here before deciding we've gotten a bad argument.  */
 501           if (optc == 'v')
 502             {
 503 #ifdef VMS
 504               /* Telling getopt to treat -v's value as optional can result
 505                  in it picking up a following filename argument here.  The
 506                  VMS code in md_parse_option can return 0 in that case,
 507                  but it has no way of pushing the filename argument back.  */
 508               if (optarg && *optarg)
 509                 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
 510               else
 511 #else
 512               case 'v':
 513 #endif
 514               case OPTION_VERBOSE:
 515                 print_version_id ();
 516                 verbose = 1;
 517               break;
 518             }
 519           /* Fall through.  */
 520
 521         case '?':
 522           exit (EXIT_FAILURE);
 523
 524         case 1:                 /* File name.  */
 525           if (!strcmp (optarg, "-"))
 526             optarg = "";
 527           new_argv[new_argc++] = optarg;
 528           new_argv[new_argc] = NULL;
 529           break;
 530
 531         case OPTION_TARGET_HELP:
 532           md_show_usage (stdout);
 533           exit (EXIT_SUCCESS);
 534
 535         case OPTION_HELP:
 536           show_usage (stdout);
 537           exit (EXIT_SUCCESS);
 538
 539         case OPTION_NOCPP:
 540           break;
 541
 542         case OPTION_STATISTICS:
 543           flag_print_statistics = 1;
 544           break;
 545
 546         case OPTION_STRIP_LOCAL_ABSOLUTE:
 547           flag_strip_local_absolute = 1;
 548           break;
 549
 550         case OPTION_TRADITIONAL_FORMAT:
 551           flag_traditional_format = 1;
 552           break;
 553
 554         case OPTION_VERSION:
 555           /* This output is intended to follow the GNU standards document.  */
 556 #ifdef BFD_ASSEMBLER
 557           printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
 558 #else
 559           printf (_("GNU assembler %s\n"), VERSION);
 560 #endif
 561           printf (_("Copyright 2002 Free Software Foundation, Inc.\n"));
 562           printf (_("\
 563 This program is free software; you may redistribute it under the terms of\n\
 564 the GNU General Public License.  This program has absolutely no warranty.\n"));
 565           printf (_("This assembler was configured for a target of `%s'.\n"),
 566                   TARGET_ALIAS);
 567           exit (EXIT_SUCCESS);
 568
 569         case OPTION_EMULATION:
 570 #ifdef USE_EMULATIONS
 571           if (strcmp (optarg, this_emulation->name))
 572             as_fatal (_("multiple emulation names specified"));
 573 #else
 574           as_fatal (_("emulations not handled in this configuration"));
 575 #endif
 576           break;
 577
 578         case OPTION_DUMPCONFIG:
 579           fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
 580           fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
 581           fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
 582 #ifdef TARGET_OBJ_FORMAT
 583           fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
 584 #endif
 585 #ifdef TARGET_FORMAT
 586           fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
 587 #endif
 588           exit (EXIT_SUCCESS);
 589
 590         case OPTION_DEFSYM:
 591           {
 592             char *s;
 593             valueT i;
 594             struct defsym_list *n;
 595
 596             for (s = optarg; *s != '\0' && *s != '='; s++)
 597               ;
 598             if (*s == '\0')
 599               as_fatal (_("bad defsym; format is --defsym name=value"));
 600             *s++ = '\0';
 601 #ifdef BFD_ASSEMBLER
 602             i = bfd_scan_vma (s, (const char **) NULL, 0);
 603 #else
 604             i = strtol (s, (char **) NULL, 0);
 605 #endif
 606             n = (struct defsym_list *) xmalloc (sizeof *n);
 607             n->next = defsyms;
 608             n->name = optarg;
 609             n->value = i;
 610             defsyms = n;
 611           }
 612           break;
 613
 614         case OPTION_INSTTBL:
 615         case 't':
 616           {
 617             /* optarg is the name of the file containing the instruction
 618                formats, opcodes, register names, etc.  */
 619             struct itbl_file_list *n;
 620
 621             if (optarg == NULL)
 622               {
 623                 as_warn (_("no file name following -t option"));
 624                 break;
 625               }
 626
 627             n = (struct itbl_file_list *) xmalloc (sizeof *n);
 628             n->next = itbl_files;
 629             n->name = optarg;
 630             itbl_files = n;
 631
 632             /* Parse the file and add the new instructions to our internal
 633                table.  If multiple instruction tables are specified, the
 634                information from this table gets appended onto the existing
 635                internal table.  */
 636             itbl_files->name = xstrdup (optarg);
 637             if (itbl_parse (itbl_files->name) != 0)
 638               as_fatal (_("failed to read instruction table %s\n"),
 639                         itbl_files->name);
 640           }
 641           break;
 642
 643         case OPTION_DEPFILE:
 644           start_dependencies (optarg);
 645           break;
 646
 647         case OPTION_GSTABS:
 648           debug_type = DEBUG_STABS;
 649           break;
 650
 651         case OPTION_GDWARF2:
 652           debug_type = DEBUG_DWARF2;
 653           break;
 654
 655         case 'J':
 656           flag_signed_overflow_ok = 1;
 657           break;
 658
 659 #ifndef WORKING_DOT_WORD
 660         case 'K':
 661           flag_warn_displacement = 1;
 662           break;
 663 #endif
 664
 665         case 'L':
 666           flag_keep_locals = 1;
 667           break;
 668
 669         case OPTION_LISTING_LHS_WIDTH:
 670           listing_lhs_width = atoi (optarg);
 671           if (listing_lhs_width_second < listing_lhs_width)
 672             listing_lhs_width_second = listing_lhs_width;
 673           break;
 674         case OPTION_LISTING_LHS_WIDTH2:
 675           {
 676             int tmp = atoi (optarg);
 677             if (tmp > listing_lhs_width)
 678               listing_lhs_width_second = tmp;
 679           }
 680           break;
 681         case OPTION_LISTING_RHS_WIDTH:
 682           listing_rhs_width = atoi (optarg);
 683           break;
 684         case OPTION_LISTING_CONT_LINES:
 685           listing_lhs_cont_lines = atoi (optarg);
 686           break;
 687
 688         case 'M':
 689           flag_mri = 1;
 690 #ifdef TC_M68K
 691           flag_m68k_mri = 1;
 692 #endif
 693           break;
 694
 695         case 'R':
 696           flag_readonly_data_in_text = 1;
 697           break;
 698
 699         case 'W':
 700           flag_no_warnings = 1;
 701           break;
 702
 703         case OPTION_WARN:
 704           flag_no_warnings = 0;
 705           flag_fatal_warnings = 0;
 706           break;
 707
 708         case OPTION_WARN_FATAL:
 709           flag_no_warnings = 0;
 710           flag_fatal_warnings = 1;
 711           break;
 712
 713 #if defined BFD_ASSEMBLER && (defined OBJ_ELF || defined OBJ_MAYBE_ELF)
 714         case OPTION_EXECSTACK:
 715           flag_execstack = 1;
 716           flag_noexecstack = 0;
 717           break;
 718
 719         case OPTION_NOEXECSTACK:
 720           flag_noexecstack = 1;
 721           flag_execstack = 0;
 722           break;
 723 #endif
 724
 725         case 'Z':
 726           flag_always_generate_output = 1;
 727           break;
 728
 729         case 'a':
 730           if (optarg)
 731             {
 732               if (md_parse_option (optc, optarg) != 0)
 733                 break;
 734
 735               while (*optarg)
 736                 {
 737                   switch (*optarg)
 738                     {
 739                     case 'c':
 740                       listing |= LISTING_NOCOND;
 741                       break;
 742                     case 'd':
 743                       listing |= LISTING_NODEBUG;
 744                       break;
 745                     case 'h':
 746                       listing |= LISTING_HLL;
 747                       break;
 748                     case 'l':
 749                       listing |= LISTING_LISTING;
 750                       break;
 751                     case 'm':
 752                       listing |= LISTING_MACEXP;
 753                       break;
 754                     case 'n':
 755                       listing |= LISTING_NOFORM;
 756                       break;
 757                     case 's':
 758                       listing |= LISTING_SYMBOLS;
 759                       break;
 760                     case '=':
 761                       listing_filename = xstrdup (optarg + 1);
 762                       optarg += strlen (listing_filename);
 763                       break;
 764                     default:
 765                       as_fatal (_("invalid listing option `%c'"), *optarg);
 766                       break;
 767                     }
 768                   optarg++;
 769                 }
 770             }
 771           if (!listing)
 772             listing = LISTING_DEFAULT;
 773           break;
 774
 775         case 'D':
 776           /* DEBUG is implemented: it debugs different
 777              things from other people's assemblers.  */
 778           flag_debug = 1;
 779           break;
 780
 781         case 'f':
 782           flag_no_comments = 1;
 783           break;
 784
 785         case 'I':
 786           {                     /* Include file directory.  */
 787             char *temp = xstrdup (optarg);
 788             add_include_dir (temp);
 789             break;
 790           }
 791
 792         case 'o':
 793           out_file_name = xstrdup (optarg);
 794           break;
 795
 796         case 'w':
 797           break;
 798
 799         case 'X':
 800           /* -X means treat warnings as errors.  */
 801           break;
 802         }
 803     }
 804
 805   free (shortopts);
 806   free (longopts);
 807
 808   *pargc = new_argc;
 809   *pargv = new_argv;
 810
 811 #ifdef md_after_parse_args
 812   md_after_parse_args ();
 813 #endif
 814 }
 815
 816 static long start_time;
 817
 818 int main PARAMS ((int, char **));
 819
 820 int
 821 main (argc, argv)
 822      int argc;
 823      char **argv;
 824 {
 825   int macro_alternate;
 826   int macro_strip_at;
 827   int keep_it;
 828
 829   start_time = get_run_time ();
 830
 831 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
 832   setlocale (LC_MESSAGES, "");
 833 #endif
 834 #if defined (HAVE_SETLOCALE)
 835   setlocale (LC_CTYPE, "");
 836 #endif
 837   bindtextdomain (PACKAGE, LOCALEDIR);
 838   textdomain (PACKAGE);
 839
 840   if (debug_memory)
 841     chunksize = 64;
 842
 843 #ifdef HOST_SPECIAL_INIT
 844   HOST_SPECIAL_INIT (argc, argv);
 845 #endif
 846
 847   myname = argv[0];
 848   xmalloc_set_program_name (myname);
 849
 850   START_PROGRESS (myname, 0);
 851
 852 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
 853 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
 854 #endif
 855
 856   out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
 857
 858   hex_init ();
 859 #ifdef BFD_ASSEMBLER
 860   bfd_init ();
 861   bfd_set_error_program_name (myname);
 862 #endif
 863
 864 #ifdef USE_EMULATIONS
 865   select_emulation_mode (argc, argv);
 866 #endif
 867
 868   PROGRESS (1);
 869   symbol_begin ();
 870   frag_init ();
 871   subsegs_begin ();
 872   parse_args (&argc, &argv);
 873   read_begin ();
 874   input_scrub_begin ();
 875   expr_begin ();
 876
 877   if (flag_print_statistics)
 878     xatexit (dump_statistics);
 879
 880   macro_alternate = 0;
 881   macro_strip_at = 0;
 882 #ifdef TC_I960
 883   macro_strip_at = flag_mri;
 884 #endif
 885 #ifdef TC_A29K
 886   /* For compatibility with the AMD 29K family macro assembler
 887      specification.  */
 888   macro_alternate = 1;
 889   macro_strip_at = 1;
 890 #endif
 891
 892   macro_init (macro_alternate, flag_mri, macro_strip_at, macro_expr);
 893
 894   PROGRESS (1);
 895
 896 #ifdef BFD_ASSEMBLER
 897   output_file_create (out_file_name);
 898   assert (stdoutput != 0);
 899 #endif
 900
 901 #ifdef tc_init_after_args
 902   tc_init_after_args ();
 903 #endif
 904
 905   itbl_init ();
 906
 907   /* Now that we have fully initialized, and have created the output
 908      file, define any symbols requested by --defsym command line
 909      arguments.  */
 910   while (defsyms != NULL)
 911     {
 912       symbolS *sym;
 913       struct defsym_list *next;
 914
 915       sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
 916                         &zero_address_frag);
 917       symbol_table_insert (sym);
 918       next = defsyms->next;
 919       free (defsyms);
 920       defsyms = next;
 921     }
 922
 923   PROGRESS (1);
 924
 925   /* Assemble it.  */
 926   perform_an_assembly_pass (argc, argv);
 927
 928   cond_finish_check (-1);
 929
 930 #ifdef md_end
 931   md_end ();
 932 #endif
 933
 934 #if defined BFD_ASSEMBLER && (defined OBJ_ELF || defined OBJ_MAYBE_ELF)
 935   if ((flag_execstack || flag_noexecstack)
 936       && OUTPUT_FLAVOR == bfd_target_elf_flavour)
 937     {
 938       segT gnustack;
 939
 940       gnustack = subseg_new (".note.GNU-stack", 0);
 941       bfd_set_section_flags (stdoutput, gnustack,
 942                              SEC_READONLY | (flag_execstack ? SEC_CODE : 0));
 943
 944     }
 945 #endif
 946
 947   /* If we've been collecting dwarf2 .debug_line info, either for
 948      assembly debugging or on behalf of the compiler, emit it now.  */
 949   dwarf2_finish ();
 950
 951   /* If we constructed dwarf2 .eh_frame info, either via .cfi
 952      directives from the user or by the backend, emit it now.  */
 953   cfi_finish ();
 954
 955   if (seen_at_least_1_file ()
 956       && (flag_always_generate_output || had_errors () == 0))
 957     keep_it = 1;
 958   else
 959     keep_it = 0;
 960
 961 #if defined (BFD_ASSEMBLER) || !defined (BFD)
 962   /* This used to be done at the start of write_object_file in
 963      write.c, but that caused problems when doing listings when
 964      keep_it was zero.  This could probably be moved above md_end, but
 965      I didn't want to risk the change.  */
 966   subsegs_finish ();
 967 #endif
 968
 969   if (keep_it)
 970     write_object_file ();
 971
 972 #ifndef NO_LISTING
 973   listing_print (listing_filename);
 974 #endif
 975
 976 #ifndef OBJ_VMS /* does its own file handling */
 977 #ifndef BFD_ASSEMBLER
 978   if (keep_it)
 979 #endif
 980     output_file_close (out_file_name);
 981 #endif
 982
 983   if (flag_fatal_warnings && had_warnings () > 0 && had_errors () == 0)
 984     as_bad (_("%d warnings, treating warnings as errors"), had_warnings ());
 985
 986   if (had_errors () > 0 && ! flag_always_generate_output)
 987     keep_it = 0;
 988
 989   if (!keep_it)
 990     unlink (out_file_name);
 991
 992   input_scrub_end ();
 993
 994   END_PROGRESS (myname);
 995
 996   /* Use xexit instead of return, because under VMS environments they
 997      may not place the same interpretation on the value given.  */
 998   if (had_errors () > 0)
 999     xexit (EXIT_FAILURE);
1000
1001   /* Only generate dependency file if assembler was successful.  */
1002   print_dependencies ();
1003
1004   xexit (EXIT_SUCCESS);
1005 }
1006
1007 static void
1008 dump_statistics ()
1009 {
1010 #ifdef HAVE_SBRK
1011   char *lim = (char *) sbrk (0);
1012 #endif
1013   long run_time = get_run_time () - start_time;
1014
1015   fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
1016            myname, run_time / 1000000, run_time % 1000000);
1017 #ifdef HAVE_SBRK
1018   fprintf (stderr, _("%s: data size %ld\n"),
1019            myname, (long) (lim - (char *) &environ));
1020 #endif
1021
1022   subsegs_print_statistics (stderr);
1023   write_print_statistics (stderr);
1024   symbol_print_statistics (stderr);
1025   read_print_statistics (stderr);
1026
1027 #ifdef tc_print_statistics
1028   tc_print_statistics (stderr);
1029 #endif
1030 #ifdef obj_print_statistics
1031   obj_print_statistics (stderr);
1032 #endif
1033 }
1034 \f
1035 /* Here to attempt 1 pass over each input file.
1036    We scan argv[*] looking for filenames or exactly "" which is
1037    shorthand for stdin. Any argv that is NULL is not a file-name.
1038    We set need_pass_2 TRUE if, after this, we still have unresolved
1039    expressions of the form (unknown value)+-(unknown value).
1040
1041    Note the un*x semantics: there is only 1 logical input file, but it
1042    may be a catenation of many 'physical' input files.  */
1043
1044 static void
1045 perform_an_assembly_pass (argc, argv)
1046      int argc;
1047      char **argv;
1048 {
1049   int saw_a_file = 0;
1050 #ifdef BFD_ASSEMBLER
1051   flagword applicable;
1052 #endif
1053
1054   need_pass_2 = 0;
1055
1056 #ifndef BFD_ASSEMBLER
1057 #ifdef MANY_SEGMENTS
1058   {
1059     unsigned int i;
1060     for (i = SEG_E0; i < SEG_UNKNOWN; i++)
1061       segment_info[i].fix_root = 0;
1062   }
1063   /* Create the three fixed ones.  */
1064   {
1065     segT seg;
1066
1067 #ifdef TE_APOLLO
1068     seg = subseg_new (".wtext", 0);
1069 #else
1070     seg = subseg_new (".text", 0);
1071 #endif
1072     assert (seg == SEG_E0);
1073     seg = subseg_new (".data", 0);
1074     assert (seg == SEG_E1);
1075     seg = subseg_new (".bss", 0);
1076     assert (seg == SEG_E2);
1077 #ifdef TE_APOLLO
1078     create_target_segments ();
1079 #endif
1080   }
1081
1082 #else /* not MANY_SEGMENTS */
1083   text_fix_root = NULL;
1084   data_fix_root = NULL;
1085   bss_fix_root = NULL;
1086 #endif /* not MANY_SEGMENTS */
1087 #else /* BFD_ASSEMBLER */
1088   /* Create the standard sections, and those the assembler uses
1089      internally.  */
1090   text_section = subseg_new (TEXT_SECTION_NAME, 0);
1091   data_section = subseg_new (DATA_SECTION_NAME, 0);
1092   bss_section = subseg_new (BSS_SECTION_NAME, 0);
1093   /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1094      to have relocs, otherwise we don't find out in time.  */
1095   applicable = bfd_applicable_section_flags (stdoutput);
1096   bfd_set_section_flags (stdoutput, text_section,
1097                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1098                                        | SEC_CODE | SEC_READONLY));
1099   bfd_set_section_flags (stdoutput, data_section,
1100                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1101                                        | SEC_DATA));
1102   bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1103   seg_info (bss_section)->bss = 1;
1104   subseg_new (BFD_ABS_SECTION_NAME, 0);
1105   subseg_new (BFD_UND_SECTION_NAME, 0);
1106   reg_section = subseg_new ("*GAS `reg' section*", 0);
1107   expr_section = subseg_new ("*GAS `expr' section*", 0);
1108
1109 #endif /* BFD_ASSEMBLER */
1110
1111   subseg_set (text_section, 0);
1112
1113   /* This may add symbol table entries, which requires having an open BFD,
1114      and sections already created, in BFD_ASSEMBLER mode.  */
1115   md_begin ();
1116
1117 #ifdef USING_CGEN
1118   gas_cgen_begin ();
1119 #endif
1120 #ifdef obj_begin
1121   obj_begin ();
1122 #endif
1123
1124   /* Skip argv[0].  */
1125   argv++;
1126   argc--;
1127
1128   while (argc--)
1129     {
1130       if (*argv)
1131         {                       /* Is it a file-name argument?  */
1132           PROGRESS (1);
1133           saw_a_file++;
1134           /* argv->"" if stdin desired, else->filename  */
1135           read_a_source_file (*argv);
1136         }
1137       argv++;                   /* completed that argv  */
1138     }
1139   if (!saw_a_file)
1140     read_a_source_file ("");
1141 }
1142
1143 /* The interface between the macro code and gas expression handling.  */
1144
1145 static int
1146 macro_expr (emsg, idx, in, val)
1147      const char *emsg;
1148      int idx;
1149      sb *in;
1150      int *val;
1151 {
1152   char *hold;
1153   expressionS ex;
1154
1155   sb_terminate (in);
1156
1157   hold = input_line_pointer;
1158   input_line_pointer = in->ptr + idx;
1159   expression (&ex);
1160   idx = input_line_pointer - in->ptr;
1161   input_line_pointer = hold;
1162
1163   if (ex.X_op != O_constant)
1164     as_bad ("%s", emsg);
1165
1166   *val = (int) ex.X_add_number;
1167
1168   return idx;
1169 }