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
));
61 #define EXIT_SUCCESS 0
62 #define EXIT_FAILURE 1
65 int listing
; /* true if a listing is wanted */
67 char *myname
; /* argv[0] */
69 segT reg_section
, expr_section
;
70 segT text_section
, data_section
, bss_section
;
73 /* This is true if the assembler should output time and space usage. */
75 static int statistics_flag
= 0;
86 fprintf (stderr
, "GNU assembler version %s (%s)", GAS_VERSION
, TARGET_ALIAS
);
88 fprintf (stderr
, ", using BFD version %s", BFD_VERSION
);
90 fprintf (stderr
, "\n");
97 fprintf (stream
, "Usage: %s [option...] [asmfile...]\n", myname
);
101 -a[sub-option...] turn on listings\n\
102 Sub-options [default hls]:\n\
103 d omit debugging directives\n\
104 h include high-level source\n\
105 l include assembly\n\
106 n omit forms processing\n\
107 s include symbols\n");
109 -D produce assembler debugging messages\n\
110 -f skip whitespace and comment preprocessing\n\
111 --help show this message and exit\n\
112 -I DIR add DIR to search list for .include directives\n\
113 -J don't warn about signed overflow\n\
114 -K warn when differences altered for long displacements\n\
115 -L keep local symbols (starting with `L')\n");
118 -o OBJFILE name the object-file output OBJFILE (default a.out)\n\
119 -R fold data section into text section\n\
120 --statistics print maximum bytes and total seconds used\n\
121 --version print assembler version number and exit\n\
122 -W suppress warnings\n\
125 -Z generate object file even after errors\n");
127 md_show_usage (stream
);
131 * Since it is easy to do here we interpret the special arg "-"
132 * to mean "use stdin" and we set that argv[] pointing to "".
133 * After we have munged argv[], the only things left are source file
134 * name(s) and ""(s) denoting stdin. These file names are used
135 * (perhaps more than once) later.
137 * check for new machine-dep cmdline options in
138 * md_parse_option definitions in config/tc-*.c
142 parse_args (pargc
, pargv
)
146 int old_argc
, new_argc
;
147 char **old_argv
, **new_argv
;
149 /* Starting the short option string with '-' is for programs that
150 expect options and other ARGV-elements in any order and that care about
151 the ordering of the two. We describe each non-option ARGV-element
152 as if it were the argument of an option with character code 1. */
155 extern CONST
char *md_shortopts
;
156 /* -v takes an argument on VMS, so we don't make it a generic option
159 CONST
char *std_shortopts
= "-JKLRWZfa::DI:o:wX";
161 /* Normal set of short options. */
162 CONST
char *std_shortopts
= "-JKLRWZfa::DI:o:vwX";
165 struct option
*longopts
;
166 extern struct option md_longopts
[];
167 extern size_t md_longopts_size
;
168 static struct option std_longopts
[] = {
169 #define OPTION_HELP (OPTION_STD_BASE)
170 {"help", no_argument
, NULL
, OPTION_HELP
},
171 #define OPTION_NOCPP (OPTION_STD_BASE + 1)
172 {"nocpp", no_argument
, NULL
, OPTION_NOCPP
},
173 #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
174 {"statistics", no_argument
, NULL
, OPTION_STATISTICS
},
175 #define OPTION_VERSION (OPTION_STD_BASE + 3)
176 {"version", no_argument
, NULL
, OPTION_VERSION
},
179 /* Construct the option lists from the standard list and the
180 target dependent list. */
181 shortopts
= concat (std_shortopts
, md_shortopts
, (char *) NULL
);
182 longopts
= (struct option
*) xmalloc (sizeof (std_longopts
) + md_longopts_size
);
183 memcpy (longopts
, std_longopts
, sizeof (std_longopts
));
184 memcpy ((char *) longopts
+ sizeof (std_longopts
),
185 md_longopts
, md_longopts_size
);
187 /* Make a local copy of the old argv. */
191 /* Initialize a new argv that contains no options. */
192 new_argv
= (char **) xmalloc (sizeof (char *) * (old_argc
+ 1));
193 new_argv
[0] = old_argv
[0];
195 new_argv
[new_argc
] = NULL
;
199 /* getopt_long_only is like getopt_long, but '-' as well as '--' can
200 indicate a long option. */
202 int optc
= getopt_long_only (old_argc
, old_argv
, shortopts
, longopts
,
211 /* md_parse_option should return 1 if it recognizes optc,
213 if (md_parse_option (optc
, optarg
) == 0)
220 case 1: /* File name. */
221 if (!strcmp (optarg
, "-"))
223 new_argv
[new_argc
++] = optarg
;
224 new_argv
[new_argc
] = NULL
;
234 case OPTION_STATISTICS
:
246 flag_signed_overflow_ok
= 1;
250 flag_warn_displacement
= 1;
254 flag_keep_locals
= 1;
258 flag_readonly_data_in_text
= 1;
262 flag_no_warnings
= 1;
266 flag_always_generate_output
= 1;
277 listing
|= LISTING_NODEBUG
;
280 listing
|= LISTING_HLL
;
283 listing
|= LISTING_LISTING
;
286 listing
|= LISTING_NOFORM
;
289 listing
|= LISTING_SYMBOLS
;
292 as_bad ("invalid listing option `%c'", *optarg
);
300 listing
= LISTING_DEFAULT
;
304 /* DEBUG is implemented: it debugs different */
305 /* things from other people's assemblers. */
310 flag_no_comments
= 1;
314 { /* Include file directory */
315 char *temp
= strdup (optarg
);
317 as_fatal ("virtual memory exhausted");
318 add_include_dir (temp
);
323 out_file_name
= strdup (optarg
);
325 as_fatal ("virtual memory exhausted");
332 /* -X means treat warnings as errors */
350 long start_time
= get_run_time ();
352 #ifdef HOST_SPECIAL_INIT
353 HOST_SPECIAL_INIT (argc
, argv
);
356 #if 0 /* do we need any of this?? */
358 static const int sig
[] = {SIGHUP
, SIGINT
, SIGPIPE
, SIGTERM
, 0};
361 for (a
= 0; sig
[a
] != 0; a
++)
362 if (signal (sig
[a
], SIG_IGN
) != SIG_IGN
)
363 signal (sig
[a
], got_sig
);
368 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
369 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
371 out_file_name
= OBJ_DEFAULT_OUTPUT_FILE_NAME
;
380 input_scrub_begin ();
382 parse_args (&argc
, &argv
);
385 output_file_create (out_file_name
);
386 assert (stdoutput
!= 0);
389 #ifdef tc_init_after_args
390 tc_init_after_args ();
393 perform_an_assembly_pass (argc
, argv
); /* Assemble it. */
398 if (seen_at_least_1_file ()
399 && !((had_warnings () && flag_always_generate_output
)
400 || had_errors () > 0))
406 write_object_file ();
412 #ifndef OBJ_VMS /* does its own file handling */
413 #ifndef BFD_ASSEMBLER
416 output_file_close (out_file_name
);
420 unlink (out_file_name
);
429 extern char **environ
;
430 char *lim
= (char *) sbrk (0);
431 long run_time
= get_run_time () - start_time
;
433 fprintf (stderr
, "%s: total time in assembly: %ld.%06ld\n",
434 myname
, run_time
/ 1000000, run_time
% 1000000);
435 fprintf (stderr
, "%s: data size %ld\n",
436 myname
, (long) (lim
- (char *) &environ
));
439 if ((had_warnings () && flag_always_generate_output
)
440 || had_errors () > 0)
446 /* perform_an_assembly_pass()
448 * Here to attempt 1 pass over each input file.
449 * We scan argv[*] looking for filenames or exactly "" which is
450 * shorthand for stdin. Any argv that is NULL is not a file-name.
451 * We set need_pass_2 TRUE if, after this, we still have unresolved
452 * expressions of the form (unknown value)+-(unknown value).
454 * Note the un*x semantics: there is only 1 logical input file, but it
455 * may be a catenation of many 'physical' input files.
458 perform_an_assembly_pass (argc
, argv
)
469 #ifndef BFD_ASSEMBLER
473 for (i
= SEG_E0
; i
< SEG_UNKNOWN
; i
++)
474 segment_info
[i
].fix_root
= 0;
476 /* Create the three fixed ones */
481 seg
= subseg_new (".wtext", 0);
483 seg
= subseg_new (".text", 0);
485 assert (seg
== SEG_E0
);
486 seg
= subseg_new (".data", 0);
487 assert (seg
== SEG_E1
);
488 seg
= subseg_new (".bss", 0);
489 assert (seg
== SEG_E2
);
491 create_target_segments ();
495 #else /* not MANY_SEGMENTS */
496 text_fix_root
= NULL
;
497 data_fix_root
= NULL
;
499 #endif /* not MANY_SEGMENTS */
500 #else /* BFD_ASSEMBLER */
501 /* Create the standard sections, and those the assembler uses
503 text_section
= subseg_new (".text", 0);
504 data_section
= subseg_new (".data", 0);
505 bss_section
= subseg_new (".bss", 0);
506 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
507 to have relocs, otherwise we don't find out in time. */
508 applicable
= bfd_applicable_section_flags (stdoutput
);
509 bfd_set_section_flags (stdoutput
, text_section
,
510 applicable
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
511 | SEC_CODE
| SEC_READONLY
));
512 /* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
513 bfd_set_section_flags (stdoutput
, data_section
,
514 applicable
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
));
515 bfd_set_section_flags (stdoutput
, bss_section
, applicable
& SEC_ALLOC
);
516 seg_info (bss_section
)->bss
= 1;
517 subseg_new (BFD_ABS_SECTION_NAME
, 0);
518 subseg_new (BFD_UND_SECTION_NAME
, 0);
519 reg_section
= subseg_new ("*GAS `reg' section*", 0);
520 expr_section
= subseg_new ("*GAS `expr' section*", 0);
522 #endif /* BFD_ASSEMBLER */
524 subseg_set (text_section
, 0);
526 /* This may add symbol table entries, which requires having an open BFD,
527 and sections already created, in BFD_ASSEMBLER mode. */
530 argv
++; /* skip argv[0] */
531 argc
--; /* skip argv[0] */
535 { /* Is it a file-name argument? */
537 /* argv->"" if stdin desired, else->filename */
538 read_a_source_file (*argv
);
540 argv
++; /* completed that argv */
543 read_a_source_file ("");
544 } /* perform_an_assembly_pass() */
547 /* This is not currently used. */
552 static here_before
= 0;
554 as_bad ("Interrupted by signal %d", sig
);
557 #if 0 /* If SIGTY is void, this produces warnings. */