gas/as.c

   1 /* as.c - GAS main program.
   2    Copyright (C) 1987, 1990, 1991, 1992, 1994 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 2, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public 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
  18    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  19
  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  *
  27  *                      bugs
  28  *
  29  * : initialisers
  30  *      Since no-one else says they will support them in future: I
  31  * don't support them now.
  32  *
  33  */
  34
  35 #include "ansidecl.h"
  36 #include "libiberty.h"
  37
  38 #define COMMON
  39
  40 #include "as.h"
  41 #include "subsegs.h"
  42 #include "output-file.h"
  43
  44 #include <signal.h>
  45
  46 #ifndef SIGTY
  47 #ifdef __STDC__
  48 #define SIGTY void
  49 #else
  50 #define SIGTY int
  51 #endif /* __STDC__ */
  52 #endif /* SIGTY */
  53
  54 #if 0
  55 /* Not currently used.  */
  56 static SIGTY got_sig PARAMS ((int sig));
  57 #endif
  58 static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
  59
  60 int listing;                    /* true if a listing is wanted */
  61
  62 char *myname;                   /* argv[0] */
  63 #ifdef BFD_ASSEMBLER
  64 segT reg_section, expr_section;
  65 segT text_section, data_section, bss_section;
  66 #endif
  67
  68 \f
  69 void
  70 print_version_id ()
  71 {
  72   static int printed;
  73   if (printed)
  74     return;
  75   printed = 1;
  76
  77   fprintf (stderr, "GNU assembler version %s (%s)", GAS_VERSION, TARGET_ALIAS);
  78 #ifdef BFD_ASSEMBLER
  79   fprintf (stderr, ", using BFD version %s", BFD_VERSION);
  80 #endif
  81   fprintf (stderr, "\n");
  82 }
  83
  84 void
  85 show_usage (stream)
  86      FILE *stream;
  87 {
  88   fprintf (stream, "Usage: %s [option...] [asmfile...]\n", myname);
  89
  90   fprintf (stream, "\
  91 Options:\n\
  92 -a[sub-option...]       turn on listings\n\
  93   Sub-options [default hls]:\n\
  94   d     omit debugging directives\n\
  95   h     include high-level source\n\
  96   l     include assembly\n\
  97   n     omit forms processing\n\
  98   s     include symbols\n");
  99   fprintf (stream, "\
 100 -D                      produce assembler debugging messages\n\
 101 -f                      skip whitespace and comment preprocessing\n\
 102 --help                  show this message and exit\n\
 103 -I DIR                  add DIR to search list for .include directives\n\
 104 -J                      don't warn about signed overflow\n\
 105 -K                      warn when differences altered for long displacements\n\
 106 -L                      keep local symbols (starting with `L')\n");
 107   fprintf (stream, "\
 108 -nocpp                  ignored\n\
 109 -o OBJFILE              name the object-file output OBJFILE (default a.out)\n\
 110 -R                      fold data section into text section\n\
 111 --statistics            print maximum bytes and total seconds used\n\
 112 --version               print assembler version number and exit\n\
 113 -W                      suppress warnings\n\
 114 -w                      ignored\n\
 115 -X                      ignored\n\
 116 -Z                      generate object file even after errors\n");
 117
 118   md_show_usage (stream);
 119 }
 120
 121 /*
 122  * Since it is easy to do here we interpret the special arg "-"
 123  * to mean "use stdin" and we set that argv[] pointing to "".
 124  * After we have munged argv[], the only things left are source file
 125  * name(s) and ""(s) denoting stdin. These file names are used
 126  * (perhaps more than once) later.
 127  *
 128  * check for new machine-dep cmdline options in
 129  * md_parse_option definitions in config/tc-*.c
 130  */
 131
 132 void
 133 parse_args (pargc, pargv)
 134      int *pargc;
 135      char ***pargv;
 136 {
 137   int old_argc, new_argc;
 138   char **old_argv, **new_argv;
 139
 140   /* Starting the short option string with '-' is for programs that
 141      expect options and other ARGV-elements in any order and that care about
 142      the ordering of the two.  We describe each non-option ARGV-element
 143      as if it were the argument of an option with character code 1.  */
 144
 145   char *shortopts;
 146   extern CONST char *md_shortopts;
 147   /* -v takes an argument on VMS, so we don't make it a generic option
 148      in that case.  */
 149 #ifdef OBJ_VMS
 150   CONST char *std_shortopts = "-JKLRWZfa::DI:o:wX";
 151 #else
 152   /* Normal set of short options.  */
 153   CONST char *std_shortopts = "-JKLRWZfa::DI:o:vwX";
 154 #endif
 155
 156   struct option *longopts;
 157   extern struct option md_longopts[];
 158   extern size_t md_longopts_size;
 159   static const struct option std_longopts[] = {
 160 #define OPTION_HELP (OPTION_STD_BASE)
 161     {"help", no_argument, NULL, OPTION_HELP},
 162 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
 163     {"nocpp", no_argument, NULL, OPTION_NOCPP},
 164 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
 165     {"statistics", no_argument, NULL, OPTION_STATISTICS},
 166 #define OPTION_VERSION (OPTION_STD_BASE + 3)
 167     {"version", no_argument, NULL, OPTION_VERSION},
 168 #define OPTION_DUMPCONFIG (OPTION_STD_BASE + 4)
 169     {"dump-config", no_argument, NULL, OPTION_DUMPCONFIG},
 170   };
 171
 172   /* Construct the option lists from the standard list and the
 173      target dependent list.  */
 174   shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
 175   longopts = (struct option *) xmalloc (sizeof (std_longopts) + md_longopts_size);
 176   memcpy (longopts, std_longopts, sizeof (std_longopts));
 177   memcpy ((char *) longopts + sizeof (std_longopts),
 178           md_longopts, md_longopts_size);
 179
 180   /* Make a local copy of the old argv.  */
 181   old_argc = *pargc;
 182   old_argv = *pargv;
 183
 184   /* Initialize a new argv that contains no options.  */
 185   new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
 186   new_argv[0] = old_argv[0];
 187   new_argc = 1;
 188   new_argv[new_argc] = NULL;
 189
 190   while (1)
 191     {
 192       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 193          indicate a long option.  */
 194       int longind;
 195       int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
 196                                    &longind);
 197
 198       if (optc == -1)
 199         break;
 200
 201       switch (optc)
 202         {
 203         default:
 204           /* md_parse_option should return 1 if it recognizes optc,
 205              0 if not.  */
 206           if (md_parse_option (optc, optarg) == 0)
 207             exit (EXIT_FAILURE);
 208           break;
 209
 210         case '?':
 211           exit (EXIT_FAILURE);
 212
 213         case 1:                 /* File name.  */
 214           if (!strcmp (optarg, "-"))
 215             optarg = "";
 216           new_argv[new_argc++] = optarg;
 217           new_argv[new_argc] = NULL;
 218           break;
 219
 220         case OPTION_HELP:
 221           show_usage (stdout);
 222           exit (EXIT_SUCCESS);
 223
 224         case OPTION_NOCPP:
 225           break;
 226
 227         case OPTION_STATISTICS:
 228           flag_print_statistics = 1;
 229           break;
 230
 231         case OPTION_VERSION:
 232           print_version_id ();
 233           exit (EXIT_SUCCESS);
 234
 235         case OPTION_DUMPCONFIG:
 236           fprintf (stderr, "alias = %s\n", TARGET_ALIAS);
 237           fprintf (stderr, "canonical = %s\n", TARGET_CANONICAL);
 238           fprintf (stderr, "cpu-type = %s\n", TARGET_CPU);
 239 #ifdef TARGET_OBJ_FORMAT
 240           fprintf (stderr, "format = %s\n", TARGET_OBJ_FORMAT);
 241 #endif
 242 #ifdef TARGET_FORMAT
 243           fprintf (stderr, "bfd-target = %s\n", TARGET_FORMAT);
 244 #endif
 245           exit (EXIT_SUCCESS);
 246
 247         case 'v':
 248           print_version_id ();
 249
 250         case 'J':
 251           flag_signed_overflow_ok = 1;
 252           break;
 253
 254         case 'K':
 255           flag_warn_displacement = 1;
 256           break;
 257
 258         case 'L':
 259           flag_keep_locals = 1;
 260           break;
 261
 262         case 'R':
 263           flag_readonly_data_in_text = 1;
 264           break;
 265
 266         case 'W':
 267           flag_no_warnings = 1;
 268           break;
 269
 270         case 'Z':
 271           flag_always_generate_output = 1;
 272           break;
 273
 274         case 'a':
 275           if (optarg)
 276             {
 277               while (*optarg)
 278                 {
 279                   switch (*optarg)
 280                     {
 281                     case 'd':
 282                       listing |= LISTING_NODEBUG;
 283                       break;
 284                     case 'h':
 285                       listing |= LISTING_HLL;
 286                       break;
 287                     case 'l':
 288                       listing |= LISTING_LISTING;
 289                       break;
 290                     case 'n':
 291                       listing |= LISTING_NOFORM;
 292                       break;
 293                     case 's':
 294                       listing |= LISTING_SYMBOLS;
 295                       break;
 296                     default:
 297                       as_fatal ("invalid listing option `%c'", *optarg);
 298                       break;
 299                     }
 300                   optarg++;
 301                 }
 302             }
 303           if (!listing)
 304             listing = LISTING_DEFAULT;
 305           break;
 306
 307         case 'D':
 308           /* DEBUG is implemented: it debugs different */
 309           /* things from other people's assemblers. */
 310           flag_debug = 1;
 311           break;
 312
 313         case 'f':
 314           flag_no_comments = 1;
 315           break;
 316
 317         case 'I':
 318           {                     /* Include file directory */
 319             char *temp = strdup (optarg);
 320             if (!temp)
 321               as_fatal ("virtual memory exhausted");
 322             add_include_dir (temp);
 323             break;
 324           }
 325
 326         case 'o':
 327           out_file_name = strdup (optarg);
 328           if (!out_file_name)
 329             as_fatal ("virtual memory exhausted");
 330           break;
 331
 332         case 'w':
 333           break;
 334
 335         case 'X':
 336           /* -X means treat warnings as errors */
 337           break;
 338         }
 339     }
 340
 341   free (shortopts);
 342   free (longopts);
 343
 344   *pargc = new_argc;
 345   *pargv = new_argv;
 346 }
 347
 348 int
 349 main (argc, argv)
 350      int argc;
 351      char **argv;
 352 {
 353   int keep_it;
 354   long start_time = get_run_time ();
 355
 356 #ifdef HOST_SPECIAL_INIT
 357   HOST_SPECIAL_INIT (argc, argv);
 358 #endif
 359
 360 #if 0 /* do we need any of this?? */
 361   {
 362     static const int sig[] = {SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
 363     int a;
 364
 365     for (a = 0; sig[a] != 0; a++)
 366       if (signal (sig[a], SIG_IGN) != SIG_IGN)
 367         signal (sig[a], got_sig);
 368   }
 369 #endif
 370
 371   myname = argv[0];
 372 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
 373 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
 374 #endif
 375   out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
 376
 377 #ifdef BFD_ASSEMBLER
 378   bfd_init ();
 379 #endif
 380
 381   symbol_begin ();
 382   subsegs_begin ();
 383   read_begin ();
 384   input_scrub_begin ();
 385   frag_init ();
 386   parse_args (&argc, &argv);
 387
 388 #ifdef BFD_ASSEMBLER
 389   output_file_create (out_file_name);
 390   assert (stdoutput != 0);
 391 #endif
 392
 393 #ifdef tc_init_after_args
 394   tc_init_after_args ();
 395 #endif
 396
 397   perform_an_assembly_pass (argc, argv);        /* Assemble it. */
 398 #ifdef TC_I960
 399   brtab_emit ();
 400 #endif
 401
 402   if (seen_at_least_1_file ()
 403       && !((had_warnings () && flag_always_generate_output)
 404            || had_errors () > 0))
 405     keep_it = 1;
 406   else
 407     keep_it = 0;
 408
 409   if (keep_it)
 410     write_object_file ();
 411
 412 #ifndef NO_LISTING
 413   listing_print ("");
 414 #endif
 415
 416 #ifndef OBJ_VMS /* does its own file handling */
 417 #ifndef BFD_ASSEMBLER
 418   if (keep_it)
 419 #endif
 420     output_file_close (out_file_name);
 421 #endif
 422
 423   if (!keep_it)
 424     unlink (out_file_name);
 425
 426   input_scrub_end ();
 427 #ifdef md_end
 428   md_end ();
 429 #endif
 430
 431   if (flag_print_statistics)
 432     {
 433       extern char **environ;
 434       char *lim = (char *) sbrk (0);
 435       long run_time = get_run_time () - start_time;
 436
 437       fprintf (stderr, "%s: total time in assembly: %ld.%06ld\n",
 438                myname, run_time / 1000000, run_time % 1000000);
 439       fprintf (stderr, "%s: data size %ld\n",
 440                myname, (long) (lim - (char *) &environ));
 441     }
 442
 443   /* Use exit instead of return, because under VMS environments they
 444      may not place the same interpretation on the value given.  */
 445   if ((had_warnings () && flag_always_generate_output)
 446       || had_errors () > 0)
 447     exit (EXIT_FAILURE);
 448   exit (EXIT_SUCCESS);
 449 }
 450 \f
 451
 452 /*                      perform_an_assembly_pass()
 453  *
 454  * Here to attempt 1 pass over each input file.
 455  * We scan argv[*] looking for filenames or exactly "" which is
 456  * shorthand for stdin. Any argv that is NULL is not a file-name.
 457  * We set need_pass_2 TRUE if, after this, we still have unresolved
 458  * expressions of the form (unknown value)+-(unknown value).
 459  *
 460  * Note the un*x semantics: there is only 1 logical input file, but it
 461  * may be a catenation of many 'physical' input files.
 462  */
 463 static void
 464 perform_an_assembly_pass (argc, argv)
 465      int argc;
 466      char **argv;
 467 {
 468   int saw_a_file = 0;
 469 #ifdef BFD_ASSEMBLER
 470   flagword applicable;
 471 #endif
 472
 473   need_pass_2 = 0;
 474
 475 #ifndef BFD_ASSEMBLER
 476 #ifdef MANY_SEGMENTS
 477   {
 478     unsigned int i;
 479     for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 480       segment_info[i].fix_root = 0;
 481   }
 482   /* Create the three fixed ones */
 483   {
 484     segT seg;
 485
 486 #ifdef TE_APOLLO
 487     seg = subseg_new (".wtext", 0);
 488 #else
 489     seg = subseg_new (".text", 0);
 490 #endif
 491     assert (seg == SEG_E0);
 492     seg = subseg_new (".data", 0);
 493     assert (seg == SEG_E1);
 494     seg = subseg_new (".bss", 0);
 495     assert (seg == SEG_E2);
 496 #ifdef TE_APOLLO
 497     create_target_segments ();
 498 #endif
 499   }
 500
 501 #else /* not MANY_SEGMENTS */
 502   text_fix_root = NULL;
 503   data_fix_root = NULL;
 504   bss_fix_root = NULL;
 505 #endif /* not MANY_SEGMENTS */
 506 #else /* BFD_ASSEMBLER */
 507   /* Create the standard sections, and those the assembler uses
 508      internally.  */
 509   text_section = subseg_new (".text", 0);
 510   data_section = subseg_new (".data", 0);
 511   bss_section = subseg_new (".bss", 0);
 512   /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
 513      to have relocs, otherwise we don't find out in time. */
 514   applicable = bfd_applicable_section_flags (stdoutput);
 515   bfd_set_section_flags (stdoutput, text_section,
 516                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
 517                                        | SEC_CODE | SEC_READONLY));
 518   /* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
 519   bfd_set_section_flags (stdoutput, data_section,
 520                          applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
 521   bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
 522   seg_info (bss_section)->bss = 1;
 523   subseg_new (BFD_ABS_SECTION_NAME, 0);
 524   subseg_new (BFD_UND_SECTION_NAME, 0);
 525   reg_section = subseg_new ("*GAS `reg' section*", 0);
 526   expr_section = subseg_new ("*GAS `expr' section*", 0);
 527
 528 #endif /* BFD_ASSEMBLER */
 529
 530   subseg_set (text_section, 0);
 531
 532   /* This may add symbol table entries, which requires having an open BFD,
 533      and sections already created, in BFD_ASSEMBLER mode.  */
 534   md_begin ();
 535
 536   argv++;                       /* skip argv[0] */
 537   argc--;                       /* skip argv[0] */
 538   while (argc--)
 539     {
 540       if (*argv)
 541         {                       /* Is it a file-name argument? */
 542           saw_a_file++;
 543           /* argv->"" if stdin desired, else->filename */
 544           read_a_source_file (*argv);
 545         }
 546       argv++;                   /* completed that argv */
 547     }
 548   if (!saw_a_file)
 549     read_a_source_file ("");
 550 }                               /* perform_an_assembly_pass() */
 551 \f
 552 #if 0
 553 /* This is not currently used.  */
 554 static SIGTY
 555 got_sig (sig)
 556      int sig;
 557 {
 558   static here_before = 0;
 559
 560   as_bad ("Interrupted by signal %d", sig);
 561   if (here_before++)
 562     exit (EXIT_FAILURE);
 563 #if 0 /* If SIGTY is void, this produces warnings.  */
 564   return ((SIGTY) 0);
 565 #endif
 566 }
 567 #endif
 568
 569 /* end of as.c */