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"
55 /* Not currently used. */
56 static SIGTY got_sig
PARAMS ((int sig
));
58 static void perform_an_assembly_pass
PARAMS ((int argc
, char **argv
));
60 int listing
; /* true if a listing is wanted */
62 char *myname
; /* argv[0] */
64 segT reg_section
, expr_section
;
65 segT text_section
, data_section
, bss_section
;
77 fprintf (stderr
, "GNU assembler version %s (%s)", GAS_VERSION
, TARGET_ALIAS
);
79 fprintf (stderr
, ", using BFD version %s", BFD_VERSION
);
81 fprintf (stderr
, "\n");
88 fprintf (stream
, "Usage: %s [option...] [asmfile...]\n", myname
);
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\
97 n omit forms processing\n\
98 s include symbols\n");
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");
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\
116 -Z generate object file even after errors\n");
118 md_show_usage (stream
);
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.
128 * check for new machine-dep cmdline options in
129 * md_parse_option definitions in config/tc-*.c
133 parse_args (pargc
, pargv
)
137 int old_argc
, new_argc
;
138 char **old_argv
, **new_argv
;
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. */
146 extern CONST
char *md_shortopts
;
147 /* -v takes an argument on VMS, so we don't make it a generic option
150 CONST
char *std_shortopts
= "-JKLRWZfa::DI:o:wX";
152 /* Normal set of short options. */
153 CONST
char *std_shortopts
= "-JKLRWZfa::DI:o:vwX";
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
},
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
);
180 /* Make a local copy of the old argv. */
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];
188 new_argv
[new_argc
] = NULL
;
192 /* getopt_long_only is like getopt_long, but '-' as well as '--' can
193 indicate a long option. */
195 int optc
= getopt_long_only (old_argc
, old_argv
, shortopts
, longopts
,
204 /* md_parse_option should return 1 if it recognizes optc,
206 if (md_parse_option (optc
, optarg
) == 0)
213 case 1: /* File name. */
214 if (!strcmp (optarg
, "-"))
216 new_argv
[new_argc
++] = optarg
;
217 new_argv
[new_argc
] = NULL
;
227 case OPTION_STATISTICS
:
228 flag_print_statistics
= 1;
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
);
243 fprintf (stderr
, "bfd-target = %s\n", TARGET_FORMAT
);
251 flag_signed_overflow_ok
= 1;
255 flag_warn_displacement
= 1;
259 flag_keep_locals
= 1;
263 flag_readonly_data_in_text
= 1;
267 flag_no_warnings
= 1;
271 flag_always_generate_output
= 1;
282 listing
|= LISTING_NODEBUG
;
285 listing
|= LISTING_HLL
;
288 listing
|= LISTING_LISTING
;
291 listing
|= LISTING_NOFORM
;
294 listing
|= LISTING_SYMBOLS
;
297 as_fatal ("invalid listing option `%c'", *optarg
);
304 listing
= LISTING_DEFAULT
;
308 /* DEBUG is implemented: it debugs different */
309 /* things from other people's assemblers. */
314 flag_no_comments
= 1;
318 { /* Include file directory */
319 char *temp
= strdup (optarg
);
321 as_fatal ("virtual memory exhausted");
322 add_include_dir (temp
);
327 out_file_name
= strdup (optarg
);
329 as_fatal ("virtual memory exhausted");
336 /* -X means treat warnings as errors */
354 long start_time
= get_run_time ();
356 #ifdef HOST_SPECIAL_INIT
357 HOST_SPECIAL_INIT (argc
, argv
);
360 #if 0 /* do we need any of this?? */
362 static const int sig
[] = {SIGHUP
, SIGINT
, SIGPIPE
, SIGTERM
, 0};
365 for (a
= 0; sig
[a
] != 0; a
++)
366 if (signal (sig
[a
], SIG_IGN
) != SIG_IGN
)
367 signal (sig
[a
], got_sig
);
372 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
373 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
375 out_file_name
= OBJ_DEFAULT_OUTPUT_FILE_NAME
;
384 input_scrub_begin ();
386 parse_args (&argc
, &argv
);
389 output_file_create (out_file_name
);
390 assert (stdoutput
!= 0);
393 #ifdef tc_init_after_args
394 tc_init_after_args ();
397 perform_an_assembly_pass (argc
, argv
); /* Assemble it. */
402 if (seen_at_least_1_file ()
403 && !((had_warnings () && flag_always_generate_output
)
404 || had_errors () > 0))
410 write_object_file ();
416 #ifndef OBJ_VMS /* does its own file handling */
417 #ifndef BFD_ASSEMBLER
420 output_file_close (out_file_name
);
424 unlink (out_file_name
);
431 if (flag_print_statistics
)
433 extern char **environ
;
434 char *lim
= (char *) sbrk (0);
435 long run_time
= get_run_time () - start_time
;
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
));
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)
452 /* perform_an_assembly_pass()
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).
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.
464 perform_an_assembly_pass (argc
, argv
)
475 #ifndef BFD_ASSEMBLER
479 for (i
= SEG_E0
; i
< SEG_UNKNOWN
; i
++)
480 segment_info
[i
].fix_root
= 0;
482 /* Create the three fixed ones */
487 seg
= subseg_new (".wtext", 0);
489 seg
= subseg_new (".text", 0);
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
);
497 create_target_segments ();
501 #else /* not MANY_SEGMENTS */
502 text_fix_root
= NULL
;
503 data_fix_root
= NULL
;
505 #endif /* not MANY_SEGMENTS */
506 #else /* BFD_ASSEMBLER */
507 /* Create the standard sections, and those the assembler uses
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);
528 #endif /* BFD_ASSEMBLER */
530 subseg_set (text_section
, 0);
532 /* This may add symbol table entries, which requires having an open BFD,
533 and sections already created, in BFD_ASSEMBLER mode. */
536 argv
++; /* skip argv[0] */
537 argc
--; /* skip argv[0] */
541 { /* Is it a file-name argument? */
543 /* argv->"" if stdin desired, else->filename */
544 read_a_source_file (*argv
);
546 argv
++; /* completed that argv */
549 read_a_source_file ("");
550 } /* perform_an_assembly_pass() */
553 /* This is not currently used. */
558 static here_before
= 0;
560 as_bad ("Interrupted by signal %d", sig
);
563 #if 0 /* If SIGTY is void, this produces warnings. */