1 /* as.c - GAS main program.
2 Copyright (C) 1987, 1990, 1991, 1992, 1994 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
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)
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.
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. */
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
30 * Since no-one else says they will support them in future: I
31 * don't support them now.
36 #include "libiberty.h"
42 #include <sys/types.h> /* For pid_t in signal.h */
50 #include "output-file.h"
61 /* Not currently used. */
62 static SIGTY got_sig PARAMS ((int sig));
64 static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
67 #define EXIT_SUCCESS 0
68 #define EXIT_FAILURE 1
71 int listing; /* true if a listing is wanted */
73 char *myname; /* argv[0] */
75 segT reg_section, expr_section;
76 segT text_section, data_section, bss_section;
79 /* This is true if the assembler should output time and space usage. */
81 static int statistics_flag = 0;
92 fprintf (stderr, "GNU assembler version %s (%s)", GAS_VERSION, TARGET_ALIAS);
94 fprintf (stderr, ", using BFD version %s", BFD_VERSION);
96 fprintf (stderr, "\n");
103 fprintf (stream, "Usage: %s [option...] [asmfile...]\n", myname);
107 -a[sub-option...] turn on listings\n\
108 Sub-options [default hls]:\n\
109 d omit debugging directives\n\
110 h include high-level source\n\
111 l include assembly\n\
112 n omit forms processing\n\
115 -f skip whitespace and comment preprocessing\n\
116 --help show this message and exit\n\
117 -I DIR add DIR to search list for .include directives\n\
118 -J don't warn about signed overflow\n\
119 -K warn when differences altered for long displacements\n\
120 -L keep local symbols (starting with `L')\n");
122 -o OBJFILE name the object-file output OBJFILE (default a.out)\n\
123 -R fold data section into text section\n\
124 --statistics print maximum bytes and total seconds used\n\
125 -v print assembler version number\n\
126 --version print assembler version number and exit\n\
127 -W suppress warnings\n\
130 -Z generate object file even after errors\n");
132 md_show_usage (stream);
136 * Parse arguments, but we are only interested in flags.
137 * When we find a flag, we process it then make it's argv[] NULL.
138 * This helps any future argv[] scanners avoid what we processed.
139 * Since it is easy to do here we interpret the special arg "-"
140 * to mean "use stdin" and we set that argv[] pointing to "".
141 * After we have munged argv[], the only things left are source file
142 * name(s) and ""(s) denoting stdin. These file names are used
143 * (perhaps more than once) later.
145 * check for new machine-dep cmdline options in
146 * md_parse_option definitions in config/tc-*.c
150 parse_args (pargc, pargv)
154 int old_argc, new_argc;
155 char **old_argv, **new_argv;
157 /* Starting the short option string with '-' is for programs that
158 expect options and other ARGV-elements in any order and that care about
159 the ordering of the two. We describe each non-option ARGV-element
160 as if it were the argument of an option with character code 1. */
163 extern CONST char *md_shortopts;
164 CONST char *std_shortopts = "-1JKLRWZfa::DI:o:vwX";
166 struct option *longopts;
167 extern struct option md_longopts[];
168 extern size_t md_longopts_size;
169 static struct option std_longopts[] = {
170 #define OPTION_HELP (OPTION_STD_BASE)
171 {"help", no_argument, NULL, OPTION_HELP},
172 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
173 {"nocpp", no_argument, NULL, OPTION_NOCPP},
174 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
175 {"statistics", no_argument, NULL, OPTION_STATISTICS},
176 #define OPTION_VERSION (OPTION_STD_BASE + 3)
177 {"version", no_argument, NULL, OPTION_VERSION},
180 /* Construct the option lists from the standard list and the
181 target dependent list. */
182 shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
183 longopts = xmalloc (sizeof (std_longopts) + md_longopts_size);
184 memcpy (longopts, std_longopts, sizeof (std_longopts));
185 memcpy ((char *) longopts + sizeof (std_longopts),
186 md_longopts, md_longopts_size);
188 /* Make a local copy of the old argv. */
192 /* Initialize a new argv that contains no options. */
193 new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
194 new_argv[0] = old_argv[0];
196 new_argv[new_argc] = NULL;
200 /* getopt_long_only is like getopt_long, but '-' as well as '--' can
201 indicate a long option. */
203 int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
212 /* md_parse_option should return 1 if it recognizes optc,
214 if (md_parse_option (optc, optarg) == 0)
221 case 1: /* File name. */
222 if (!strcmp (optarg, "-"))
224 new_argv[new_argc++] = optarg;
225 new_argv[new_argc] = NULL;
235 case OPTION_STATISTICS:
251 flagseen[(unsigned char) optc] = 1;
262 listing |= LISTING_NODEBUG;
265 listing |= LISTING_HLL;
268 listing |= LISTING_LISTING;
271 listing |= LISTING_NOFORM;
274 listing |= LISTING_SYMBOLS;
277 as_bad ("invalid listing option `%c'", *optarg);
285 listing = LISTING_DEFAULT;
289 /* DEBUG is implemented: it debugs different */
290 /* things to other people's assemblers. */
294 { /* Include file directory */
295 char *temp = strdup (optarg);
297 as_fatal ("virtual memory exhausted");
298 add_include_dir (temp);
303 out_file_name = strdup (optarg);
305 as_fatal ("virtual memory exhausted");
316 /* -X means treat warnings as errors */
335 long start_time = get_run_time ();
337 #if 0 /* do we need any of this?? */
339 static const int sig[] = {SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
341 for (a = 0; sig[a] != 0; a++)
342 if (signal (sig[a], SIG_IGN) != SIG_IGN)
343 signal (sig[a], got_sig);
348 memset (flagseen, '\0', sizeof (flagseen)); /* aint seen nothing yet */
349 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
350 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
352 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
361 input_scrub_begin ();
363 parse_args (&argc, &argv);
366 output_file_create (out_file_name);
367 assert (stdoutput != 0);
370 #ifdef tc_init_after_args
371 tc_init_after_args ();
374 /* Here with flags set up in flagseen[]. */
375 perform_an_assembly_pass (argc, argv); /* Assemble it. */
380 if (seen_at_least_1_file ()
381 && !((had_warnings () && flagseen['Z'])
382 || had_errors () > 0))
388 write_object_file ();
394 #ifndef OBJ_VMS /* does its own file handling */
395 #ifndef BFD_ASSEMBLER
398 output_file_close (out_file_name);
402 unlink (out_file_name);
411 extern char **environ;
412 char *lim = (char *) sbrk (0);
413 long run_time = get_run_time () - start_time;
415 fprintf (stderr, "%s: total time in assembly: %ld.%06ld\n",
416 myname, run_time / 1000000, run_time % 1000000);
417 fprintf (stderr, "%s: data size %ld\n",
418 myname, (long) (lim - (char *) &environ));
421 if ((had_warnings () && flagseen['Z'])
422 || had_errors () > 0)
428 /* perform_an_assembly_pass()
430 * Here to attempt 1 pass over each input file.
431 * We scan argv[*] looking for filenames or exactly "" which is
432 * shorthand for stdin. Any argv that is NULL is not a file-name.
433 * We set need_pass_2 TRUE if, after this, we still have unresolved
434 * expressions of the form (unknown value)+-(unknown value).
436 * Note the un*x semantics: there is only 1 logical input file, but it
437 * may be a catenation of many 'physical' input files.
440 perform_an_assembly_pass (argc, argv)
451 #ifndef BFD_ASSEMBLER
455 for (i = SEG_E0; i < SEG_UNKNOWN; i++)
456 segment_info[i].fix_root = 0;
458 /* Create the three fixed ones */
463 seg = subseg_new (".wtext", 0);
465 seg = subseg_new (".text", 0);
467 assert (seg == SEG_E0);
468 seg = subseg_new (".data", 0);
469 assert (seg == SEG_E1);
470 seg = subseg_new (".bss", 0);
471 assert (seg == SEG_E2);
473 create_target_segments ();
477 #else /* not MANY_SEGMENTS */
478 text_fix_root = NULL;
479 data_fix_root = NULL;
481 #endif /* not MANY_SEGMENTS */
482 #else /* BFD_ASSEMBLER */
483 /* Create the standard sections, and those the assembler uses
485 text_section = subseg_new (".text", 0);
486 data_section = subseg_new (".data", 0);
487 bss_section = subseg_new (".bss", 0);
488 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
489 to have relocs, otherwise we don't find out in time. */
490 applicable = bfd_applicable_section_flags (stdoutput);
491 bfd_set_section_flags (stdoutput, text_section,
492 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
493 | SEC_CODE | SEC_READONLY));
494 /* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
495 bfd_set_section_flags (stdoutput, data_section,
496 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
497 bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
498 seg_info (bss_section)->bss = 1;
499 subseg_new (BFD_ABS_SECTION_NAME, 0);
500 subseg_new (BFD_UND_SECTION_NAME, 0);
501 reg_section = subseg_new ("*GAS `reg' section*", 0);
502 expr_section = subseg_new ("*GAS `expr' section*", 0);
504 #endif /* BFD_ASSEMBLER */
506 subseg_set (text_section, 0);
508 /* This may add symbol table entries, which requires having an open BFD,
509 and sections already created, in BFD_ASSEMBLER mode. */
512 argv++; /* skip argv[0] */
513 argc--; /* skip argv[0] */
517 { /* Is it a file-name argument? */
519 /* argv->"" if stdin desired, else->filename */
520 read_a_source_file (*argv);
522 argv++; /* completed that argv */
525 read_a_source_file ("");
526 } /* perform_an_assembly_pass() */
529 /* This is not currently used. */
534 static here_before = 0;
536 as_bad ("Interrupted by signal %d", sig);
539 #if 0 /* If SIGTY is void, this produces warnings. */