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 "output-file.h"
44 static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
46 int listing; /* true if a listing is wanted */
48 char *myname; /* argv[0] */
50 segT reg_section, expr_section;
51 segT text_section, data_section, bss_section;
63 fprintf (stderr, "GNU assembler version %s (%s)", GAS_VERSION, TARGET_ALIAS);
65 fprintf (stderr, ", using BFD version %s", BFD_VERSION);
67 fprintf (stderr, "\n");
74 fprintf (stream, "Usage: %s [option...] [asmfile...]\n", myname);
78 -a[sub-option...] turn on listings\n\
79 Sub-options [default hls]:\n\
80 d omit debugging directives\n\
81 h include high-level source\n\
83 n omit forms processing\n\
84 s include symbols\n");
86 -D produce assembler debugging messages\n\
87 -f skip whitespace and comment preprocessing\n\
88 --help show this message and exit\n\
89 -I DIR add DIR to search list for .include directives\n\
90 -J don't warn about signed overflow\n\
91 -K warn when differences altered for long displacements\n\
92 -L keep local symbols (starting with `L')\n");
95 -o OBJFILE name the object-file output OBJFILE (default a.out)\n\
96 -R fold data section into text section\n\
97 --statistics print maximum bytes and total seconds used\n\
98 --version print assembler version number and exit\n\
99 -W suppress warnings\n\
102 -Z generate object file even after errors\n");
104 md_show_usage (stream);
107 #ifdef USE_EMULATIONS
108 #define EMULATION_ENVIRON "AS_EMULATION"
110 extern struct emulation mipsbelf, mipslelf, mipself;
111 extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
113 static const char *emulation_name;
114 static struct emulation *const emulations[] = { EMULATIONS };
115 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
118 select_emulation_mode (argc, argv)
125 for (i = 1; i < argc; i++)
126 if (!strncmp ("--em", argv[i], 4))
132 p = strchr (argv[i], '=');
139 as_fatal ("missing emulation mode name");
144 em = getenv (EMULATION_ENVIRON);
146 em = DEFAULT_EMULATION;
150 for (i = 0; i < n_emulations; i++)
151 if (!strcmp (emulations[i]->name, em))
153 if (i == n_emulations)
154 as_fatal ("unrecognized emulation name `%s'", em);
155 this_emulation = emulations[i];
158 this_emulation = emulations[0];
160 this_emulation->init ();
164 default_emul_bfd_name ()
172 this_format = this_emulation->format;
174 if (this_emulation->leading_underscore == 2)
175 this_emulation->leading_underscore = this_format->dfl_leading_underscore;
177 if (this_emulation->default_endian != 2)
178 target_big_endian = this_emulation->default_endian;
180 if (this_emulation->fake_label_name == 0)
182 if (this_emulation->leading_underscore)
183 this_emulation->fake_label_name = "L0\001";
185 /* What other parameters should we test? */
186 this_emulation->fake_label_name = ".L0\001";
192 * Since it is easy to do here we interpret the special arg "-"
193 * to mean "use stdin" and we set that argv[] pointing to "".
194 * After we have munged argv[], the only things left are source file
195 * name(s) and ""(s) denoting stdin. These file names are used
196 * (perhaps more than once) later.
198 * check for new machine-dep cmdline options in
199 * md_parse_option definitions in config/tc-*.c
203 parse_args (pargc, pargv)
207 int old_argc, new_argc;
208 char **old_argv, **new_argv;
210 /* Starting the short option string with '-' is for programs that
211 expect options and other ARGV-elements in any order and that care about
212 the ordering of the two. We describe each non-option ARGV-element
213 as if it were the argument of an option with character code 1. */
216 extern CONST char *md_shortopts;
218 /* -v takes an argument on VMS, so we don't make it a generic option. */
219 CONST char *std_shortopts = "-JKLRWZfa::DI:o:wX";
221 CONST char *std_shortopts = "-JKLRWZfa::DI:o:vwX";
224 struct option *longopts;
225 extern struct option md_longopts[];
226 extern size_t md_longopts_size;
227 static const struct option std_longopts[] = {
228 #define OPTION_HELP (OPTION_STD_BASE)
229 {"help", no_argument, NULL, OPTION_HELP},
230 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
231 {"nocpp", no_argument, NULL, OPTION_NOCPP},
232 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
233 {"statistics", no_argument, NULL, OPTION_STATISTICS},
234 #define OPTION_VERSION (OPTION_STD_BASE + 3)
235 {"version", no_argument, NULL, OPTION_VERSION},
236 #define OPTION_DUMPCONFIG (OPTION_STD_BASE + 4)
237 {"dump-config", no_argument, NULL, OPTION_DUMPCONFIG},
238 #define OPTION_VERBOSE (OPTION_STD_BASE + 5)
239 {"verbose", no_argument, NULL, OPTION_VERBOSE},
240 #define OPTION_EMULATION (OPTION_STD_BASE + 6)
241 {"emulation", required_argument, NULL, OPTION_EMULATION},
244 /* Construct the option lists from the standard list and the
245 target dependent list. */
246 shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
247 longopts = (struct option *) xmalloc (sizeof (std_longopts) + md_longopts_size);
248 memcpy (longopts, std_longopts, sizeof (std_longopts));
249 memcpy ((char *) longopts + sizeof (std_longopts),
250 md_longopts, md_longopts_size);
252 /* Make a local copy of the old argv. */
256 /* Initialize a new argv that contains no options. */
257 new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
258 new_argv[0] = old_argv[0];
260 new_argv[new_argc] = NULL;
264 /* getopt_long_only is like getopt_long, but '-' as well as '--' can
265 indicate a long option. */
267 int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
276 /* md_parse_option should return 1 if it recognizes optc,
278 if (md_parse_option (optc, optarg) != 0)
280 /* `-v' isn't included in the general short_opts list, so check for
281 it explicity here before deciding we've gotten a bad argument. */
285 /* Telling getopt to treat -v's value as optional can result
286 in it picking up a following filename argument here. The
287 VMS code in md_parse_option can return 0 in that case,
288 but it has no way of pushing the filename argument back. */
289 if (optarg && *optarg)
290 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
304 case 1: /* File name. */
305 if (!strcmp (optarg, "-"))
307 new_argv[new_argc++] = optarg;
308 new_argv[new_argc] = NULL;
318 case OPTION_STATISTICS:
319 flag_print_statistics = 1;
326 case OPTION_EMULATION:
327 #ifdef USE_EMULATIONS
328 if (strcmp (optarg, this_emulation->name))
329 as_fatal ("multiple emulation names specified");
331 as_fatal ("emulations not handled in this configuration");
335 case OPTION_DUMPCONFIG:
336 fprintf (stderr, "alias = %s\n", TARGET_ALIAS);
337 fprintf (stderr, "canonical = %s\n", TARGET_CANONICAL);
338 fprintf (stderr, "cpu-type = %s\n", TARGET_CPU);
339 #ifdef TARGET_OBJ_FORMAT
340 fprintf (stderr, "format = %s\n", TARGET_OBJ_FORMAT);
343 fprintf (stderr, "bfd-target = %s\n", TARGET_FORMAT);
348 flag_signed_overflow_ok = 1;
352 flag_warn_displacement = 1;
356 flag_keep_locals = 1;
360 flag_readonly_data_in_text = 1;
364 flag_no_warnings = 1;
368 flag_always_generate_output = 1;
379 listing |= LISTING_NODEBUG;
382 listing |= LISTING_HLL;
385 listing |= LISTING_LISTING;
388 listing |= LISTING_NOFORM;
391 listing |= LISTING_SYMBOLS;
394 as_fatal ("invalid listing option `%c'", *optarg);
401 listing = LISTING_DEFAULT;
405 /* DEBUG is implemented: it debugs different */
406 /* things from other people's assemblers. */
411 flag_no_comments = 1;
415 { /* Include file directory */
416 char *temp = strdup (optarg);
418 as_fatal ("virtual memory exhausted");
419 add_include_dir (temp);
424 out_file_name = strdup (optarg);
426 as_fatal ("virtual memory exhausted");
433 /* -X means treat warnings as errors */
451 long start_time = get_run_time ();
453 #ifdef HOST_SPECIAL_INIT
454 HOST_SPECIAL_INIT (argc, argv);
458 xmalloc_set_program_name (myname);
460 START_PROGRESS (myname, 0);
462 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
463 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
466 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
473 #ifdef USE_EMULATIONS
474 select_emulation_mode (argc, argv);
482 input_scrub_begin ();
484 parse_args (&argc, &argv);
489 output_file_create (out_file_name);
490 assert (stdoutput != 0);
493 #ifdef tc_init_after_args
494 tc_init_after_args ();
499 perform_an_assembly_pass (argc, argv); /* Assemble it. */
503 /* start-sanitize-rce */
507 /* end-sanitize-rce */
509 if (seen_at_least_1_file ()
510 && !((had_warnings () && flag_always_generate_output)
511 || had_errors () > 0))
517 write_object_file ();
523 #ifndef OBJ_VMS /* does its own file handling */
524 #ifndef BFD_ASSEMBLER
527 output_file_close (out_file_name);
531 unlink (out_file_name);
538 END_PROGRESS (myname);
540 if (flag_print_statistics)
542 extern char **environ;
544 char *lim = (char *) sbrk (0);
546 long run_time = get_run_time () - start_time;
548 fprintf (stderr, "%s: total time in assembly: %ld.%06ld\n",
549 myname, run_time / 1000000, run_time % 1000000);
551 fprintf (stderr, "%s: data size %ld\n",
552 myname, (long) (lim - (char *) &environ));
556 /* Use exit instead of return, because under VMS environments they
557 may not place the same interpretation on the value given. */
558 if ((had_warnings () && flag_always_generate_output)
559 || had_errors () > 0)
565 /* perform_an_assembly_pass()
567 * Here to attempt 1 pass over each input file.
568 * We scan argv[*] looking for filenames or exactly "" which is
569 * shorthand for stdin. Any argv that is NULL is not a file-name.
570 * We set need_pass_2 TRUE if, after this, we still have unresolved
571 * expressions of the form (unknown value)+-(unknown value).
573 * Note the un*x semantics: there is only 1 logical input file, but it
574 * may be a catenation of many 'physical' input files.
577 perform_an_assembly_pass (argc, argv)
588 #ifndef BFD_ASSEMBLER
592 for (i = SEG_E0; i < SEG_UNKNOWN; i++)
593 segment_info[i].fix_root = 0;
595 /* Create the three fixed ones */
600 seg = subseg_new (".wtext", 0);
602 seg = subseg_new (".text", 0);
604 assert (seg == SEG_E0);
605 seg = subseg_new (".data", 0);
606 assert (seg == SEG_E1);
607 seg = subseg_new (".bss", 0);
608 assert (seg == SEG_E2);
610 create_target_segments ();
614 #else /* not MANY_SEGMENTS */
615 text_fix_root = NULL;
616 data_fix_root = NULL;
618 #endif /* not MANY_SEGMENTS */
619 #else /* BFD_ASSEMBLER */
620 /* Create the standard sections, and those the assembler uses
622 text_section = subseg_new (".text", 0);
623 data_section = subseg_new (".data", 0);
624 bss_section = subseg_new (".bss", 0);
625 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
626 to have relocs, otherwise we don't find out in time. */
627 applicable = bfd_applicable_section_flags (stdoutput);
628 bfd_set_section_flags (stdoutput, text_section,
629 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
630 | SEC_CODE | SEC_READONLY));
631 /* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
632 bfd_set_section_flags (stdoutput, data_section,
633 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
634 bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
635 seg_info (bss_section)->bss = 1;
636 subseg_new (BFD_ABS_SECTION_NAME, 0);
637 subseg_new (BFD_UND_SECTION_NAME, 0);
638 reg_section = subseg_new ("*GAS `reg' section*", 0);
639 expr_section = subseg_new ("*GAS `expr' section*", 0);
641 #endif /* BFD_ASSEMBLER */
643 subseg_set (text_section, 0);
645 /* This may add symbol table entries, which requires having an open BFD,
646 and sections already created, in BFD_ASSEMBLER mode. */
649 argv++; /* skip argv[0] */
650 argc--; /* skip argv[0] */
654 { /* Is it a file-name argument? */
657 /* argv->"" if stdin desired, else->filename */
658 read_a_source_file (*argv);
660 argv++; /* completed that argv */
663 read_a_source_file ("");
664 } /* perform_an_assembly_pass() */