1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
|
/* as.c - GAS main program.
Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* Main program for AS; a 32-bit assembler of GNU.
* Understands command arguments.
* Has a few routines that don't fit in other modules because they
* are shared.
*
*
* bugs
*
* : initialisers
* Since no-one else says they will support them in future: I
* don't support them now.
*
*/
#include <stdio.h>
#include <string.h>
#ifdef _POSIX_SOURCE
#include <sys/types.h> /* For pid_t in signal.h */
#endif
#include <signal.h>
#define COMMON
#include "as.h"
#include "config.h"
#include "subsegs.h"
#ifndef SIGTY
#ifdef __STDC__
#define SIGTY void
#else
#define SIGTY int
#endif /* __STDC__ */
#endif /* SIGTY */
static SIGTY got_sig PARAMS ((int sig));
static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#define EXIT_FAILURE 1
#endif
int listing; /* true if a listing is wanted */
char *myname; /* argv[0] */
#ifdef BFD_ASSEMBLER
segT big_section, reg_section, pass1_section;
segT diff_section, absent_section;
segT text_section, data_section, bss_section;
#endif
void
print_version_id ()
{
static int printed;
if (printed)
return;
printed = 1;
fprintf (stderr, "GNU assembler version %s (%s)", GAS_VERSION, TARGET_ALIAS);
#ifdef BFD_ASSEMBLER
fprintf (stderr, ", using BFD version %s", BFD_VERSION);
#endif
fprintf (stderr, "\n");
}
int
main (argc, argv)
int argc;
char **argv;
{
int work_argc; /* variable copy of argc */
char **work_argv; /* variable copy of argv */
char *arg; /* an arg to program */
char a; /* an arg flag (after -) */
#if 0 /* do we need any of this?? */
{
static const int sig[] = {SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
for (a = 0; sig[a] != 0; a++)
if (signal (sig[a], SIG_IGN) != SIG_IGN)
signal (sig[a], got_sig);
}
#endif
myname = argv[0];
memset (flagseen, '\0', sizeof (flagseen)); /* aint seen nothing yet */
#ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
#define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
#endif
out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
#ifdef BFD_ASSEMBLER
bfd_init ();
#endif
symbol_begin ();
subsegs_begin ();
read_begin ();
input_scrub_begin ();
frag_init ();
/*
* Parse arguments, but we are only interested in flags.
* When we find a flag, we process it then make it's argv[] NULL.
* This helps any future argv[] scanners avoid what we processed.
* Since it is easy to do here we interpret the special arg "-"
* to mean "use stdin" and we set that argv[] pointing to "".
* After we have munged argv[], the only things left are source file
* name(s) and ""(s) denoting stdin. These file names are used
* (perhaps more than once) later.
*/
/* FIXME-SOMEDAY this should use getopt. */
work_argc = argc - 1; /* don't count argv[0] */
work_argv = argv + 1; /* skip argv[0] */
for (; work_argc--; work_argv++)
{
arg = *work_argv; /* work_argv points to this argument */
if (*arg != '-') /* Filename. We need it later. */
continue; /* Keep scanning args looking for flags. */
if (arg[1] == '-' && arg[2] == 0)
{
/* "--" as an argument means read STDIN */
/* on this scan, we don't want to think about filenames */
*work_argv = ""; /* Code that means 'use stdin'. */
continue;
}
/* This better be a switch. */
arg++; /*->letter. */
while ((a = *arg) != '\0')
{ /* scan all the 1-char flags */
arg++; /* arg->after letter. */
a &= 0x7F; /* ascii only please */
flagseen[a] = 1;
switch (a)
{
case 'a':
{
int loop = 1;
while (loop)
{
switch (*arg)
{
case 'l':
listing |= LISTING_LISTING;
arg++;
break;
case 's':
listing |= LISTING_SYMBOLS;
arg++;
break;
case 'h':
listing |= LISTING_HLL;
arg++;
break;
case 'n':
listing |= LISTING_NOFORM;
arg++;
break;
case 'd':
listing |= LISTING_NODEBUG;
arg++;
break;
default:
if (!listing)
listing = LISTING_DEFAULT;
loop = 0;
break;
}
}
}
break;
case 'f':
break; /* -f means fast - no need for "app" preprocessor. */
case 'D':
/* DEBUG is implemented: it debugs different */
/* things to other people's assemblers. */
break;
case 'I':
{ /* Include file directory */
char *temp = NULL;
if (*arg)
{
temp = strdup (arg);
if (!temp)
as_fatal ("virtual memory exhuasted");
}
else if (work_argc)
{
*work_argv = NULL;
work_argc--;
temp = *++work_argv;
}
else
as_warn ("%s: I expected a filename after -I", myname);
add_include_dir (temp);
arg = ""; /* Finished with this arg. */
break;
}
#ifdef WARN_SIGNED_OVERFLOW_WORD
/* Don't warn about signed overflow. */
case 'J':
break;
#endif
#ifndef WORKING_DOT_WORD
case 'K':
break;
#endif
case 'L': /* -L means keep L* symbols */
break;
case 'o':
if (*arg) /* Rest of argument is object file-name. */
{
out_file_name = strdup (arg);
if (!out_file_name)
as_fatal ("virtual memory exhausted");
}
else if (work_argc)
{ /* Want next arg for a file-name. */
*work_argv = NULL; /* This is not a file-name. */
work_argc--;
out_file_name = *++work_argv;
}
else
as_warn ("%s: I expected a filename after -o. \"%s\" assumed.",
myname, out_file_name);
arg = ""; /* Finished with this arg. */
break;
case 'R':
/* -R means put data into text segment */
flag_readonly_data_in_text = 1;
break;
case 'v':
#ifdef VMS
{
extern char *compiler_version_string;
compiler_version_string = arg;
}
#else /* not VMS */
if (*arg && strcmp (arg, "ersion"))
{
as_warn ("Unknown option `-v%s' ignored", arg);
arg += strlen (arg);
break;
}
print_version_id ();
#endif /* not VMS */
while (*arg)
arg++; /* Skip the rest */
break;
case 'W':
/* -W means don't warn about things */
flag_suppress_warnings = 1;
break;
case 'w':
case 'X':
/* -X means treat warnings as errors */
break;
case 'Z':
/* -Z means attempt to generate object file even after errors. */
flag_always_generate_output = 1;
break;
default:
--arg;
if (md_parse_option (&arg, &work_argc, &work_argv) == 0)
as_warn ("%s: I don't understand '%c' flag.", myname, a);
if (arg && *arg)
arg++;
break;
}
}
/*
* We have just processed a "-..." arg, which was not a
* file-name. Smash it so the
* things that look for filenames won't ever see it.
*
* Whatever work_argv points to, it has already been used
* as part of a flag, so DON'T re-use it as a filename.
*/
*work_argv = NULL; /* NULL means 'not a file-name' */
}
#ifdef BFD_ASSEMBLER
output_file_create (out_file_name);
assert (stdoutput != 0);
#endif
/* Here with flags set up in flagseen[]. */
perform_an_assembly_pass (argc, argv); /* Assemble it. */
#ifdef TC_I960
brtab_emit ();
#endif
if (seen_at_least_1_file ()
&& !((had_warnings () && flag_always_generate_output)
|| had_errors () > 0))
{
write_object_file (); /* relax() addresses then emit object file */
} /* we also check in write_object_file() just before emit. */
#ifdef BFD_ASSEMBLER
else
{
output_file_close (out_file_name);
unlink (out_file_name);
}
#endif
input_scrub_end ();
md_end (); /* MACHINE.c */
#ifndef NO_LISTING
listing_print ("");
#endif
if ((had_warnings () && flagseen['Z'])
|| had_errors () > 0)
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
/* perform_an_assembly_pass()
*
* Here to attempt 1 pass over each input file.
* We scan argv[*] looking for filenames or exactly "" which is
* shorthand for stdin. Any argv that is NULL is not a file-name.
* We set need_pass_2 TRUE if, after this, we still have unresolved
* expressions of the form (unknown value)+-(unknown value).
*
* Note the un*x semantics: there is only 1 logical input file, but it
* may be a catenation of many 'physical' input files.
*/
static void
perform_an_assembly_pass (argc, argv)
int argc;
char **argv;
{
int saw_a_file = 0;
#ifdef BFD_ASSEMBLER
flagword applicable;
#endif
need_pass_2 = 0;
#ifndef BFD_ASSEMBLER
#ifdef MANY_SEGMENTS
{
unsigned int i;
for (i = SEG_E0; i < SEG_UNKNOWN; i++)
segment_info[i].fix_root = 0;
}
/* Create the three fixed ones */
subseg_new (SEG_E0, 0);
subseg_new (SEG_E1, 0);
subseg_new (SEG_E2, 0);
strcpy (segment_info[SEG_E0].scnhdr.s_name, ".text");
strcpy (segment_info[SEG_E1].scnhdr.s_name, ".data");
strcpy (segment_info[SEG_E2].scnhdr.s_name, ".bss");
subseg_new (SEG_E0, 0);
#else /* not MANY_SEGMENTS */
text_fix_root = NULL;
data_fix_root = NULL;
bss_fix_root = NULL;
subseg_new (SEG_TEXT, 0);
#endif /* not MANY_SEGMENTS */
#else /* BFD_ASSEMBLER */
/* Create the standard sections, and those the assembler uses
internally. */
text_section = subseg_new (".text", 0);
data_section = subseg_new (".data", 0);
bss_section = subseg_new (".bss", 0);
/* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
to have relocs, otherwise we don't find out in time. */
applicable = bfd_applicable_section_flags (stdoutput);
bfd_set_section_flags (stdoutput, text_section,
applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
| SEC_CODE | SEC_READONLY));
/* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
bfd_set_section_flags (stdoutput, data_section,
applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
subseg_new (BFD_ABS_SECTION_NAME, 0);
subseg_new (BFD_UND_SECTION_NAME, 0);
big_section = subseg_new ("*GAS `big' section*", 0);
reg_section = subseg_new ("*GAS `reg' section*", 0);
pass1_section = subseg_new ("*GAS `pass1' section*", 0);
diff_section = subseg_new ("*GAS `diff' section*", 0);
absent_section = subseg_new ("*GAS `absent' section*", 0);
subseg_new (".text", 0);
#endif /* BFD_ASSEMBLER */
/* This may add symbol table entries, which requires having an open BFD,
and sections already created, in BFD_ASSEMBLER mode. */
md_begin ();
argv++; /* skip argv[0] */
argc--; /* skip argv[0] */
while (argc--)
{
if (*argv)
{ /* Is it a file-name argument? */
saw_a_file++;
/* argv->"" if stdin desired, else->filename */
read_a_source_file (*argv);
}
argv++; /* completed that argv */
}
if (!saw_a_file)
read_a_source_file ("");
} /* perform_an_assembly_pass() */
static SIGTY
got_sig (sig)
int sig;
{
static here_before = 0;
as_bad ("Interrupted by signal %d", sig);
if (here_before++)
exit (EXIT_FAILURE);
#if 0 /* If SIGTY is void, this produces warnings. */
return ((SIGTY) 0);
#endif
}
/* end of as.c */
|