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1 /* as.c - GAS main program.
2 Copyright (C) 1987-2025 Free Software Foundation, Inc.
3
4 This file is part of GAS, the GNU Assembler.
5
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 3, or (at your option)
9 any later version.
10
11 GAS is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
15
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 the Free
18 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19 02110-1301, USA. */
20
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
24 are shared.
25
26 bugs
27
28 : initialisers
29 Since no-one else says they will support them in future: I
30 don't support them now. */
31
32 #define COMMON
33
34 /* Disable code to set FAKE_LABEL_NAME in obj-multi.h, to avoid circular
35 reference. */
36 #define INITIALIZING_EMULS
37
38 #include "as.h"
39 #include "subsegs.h"
40 #include "output-file.h"
41 #include "sb.h"
42 #include "macro.h"
43 #include "dwarf2dbg.h"
44 #include "dw2gencfi.h"
45 #include "codeview.h"
46 #include "bfdver.h"
47 #include "write.h"
48 #include "ginsn.h"
49
50 #ifdef HAVE_ITBL_CPU
51 #include "itbl-ops.h"
52 #else
53 #define itbl_init()
54 #endif
55
56 #ifdef USING_CGEN
57 /* Perform any cgen specific initialisation for gas. */
58 extern void gas_cgen_begin (void);
59 #endif
60
61 /* We build a list of defsyms as we read the options, and then define
62 them after we have initialized everything. */
63 struct defsym_list
64 {
65 struct defsym_list *next;
66 char *name;
67 valueT value;
68 };
69
70
71 /* True if a listing is wanted. */
72 int listing;
73
74 /* Type of debugging to generate. */
75 enum debug_info_type debug_type = DEBUG_UNSPECIFIED;
76 int use_gnu_debug_info_extensions = 0;
77
78 #ifndef MD_DEBUG_FORMAT_SELECTOR
79 #define MD_DEBUG_FORMAT_SELECTOR NULL
80 #endif
81 static enum debug_info_type (*md_debug_format_selector) (int *) = MD_DEBUG_FORMAT_SELECTOR;
82
83 /* Maximum level of macro nesting. */
84 int max_macro_nest = 100;
85
86 /* argv[0] */
87 static char * myname;
88
89 /* The default obstack chunk size. If we set this to zero, the
90 obstack code will use whatever will fit in a 4096 byte block. */
91 int chunksize = 0;
92
93 /* To monitor memory allocation more effectively, make this non-zero.
94 Then the chunk sizes for gas and bfd will be reduced. */
95 int debug_memory = 0;
96
97 /* Enable verbose mode. */
98 int verbose = 0;
99
100 /* Which version of DWARF CIE to produce. This default value of -1
101 indicates that this value has not been set yet, a default value is
102 provided in dwarf2_init. A different value can also be supplied by the
103 command line flag --gdwarf-cie-version, or by a target in
104 MD_AFTER_PARSE_ARGS. */
105 int flag_dwarf_cie_version = -1;
106
107 /* The maximum level of DWARF DEBUG information we should manufacture.
108 This defaults to 3 unless overridden by a command line option. */
109 unsigned int dwarf_level = 3;
110
111 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
112 int flag_use_elf_stt_common = DEFAULT_GENERATE_ELF_STT_COMMON;
113 bool flag_generate_build_notes = DEFAULT_GENERATE_BUILD_NOTES;
114 #endif
115
116 segT reg_section;
117 segT expr_section;
118 segT text_section;
119 segT data_section;
120 segT bss_section;
121
122 /* Name of listing file. */
123 static char *listing_filename = NULL;
124
125 static struct defsym_list *defsyms;
126
127 static long start_time;
128
129 \f
130 #ifdef USE_EMULATIONS
131 #define EMULATION_ENVIRON "AS_EMULATION"
132
133 static struct emulation *const emulations[] = { EMULATIONS };
134 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
135
136 static void
137 select_emulation_mode (int argc, char **argv)
138 {
139 int i;
140 char *p;
141 const char *em = NULL;
142
143 for (i = 1; i < argc; i++)
144 if (startswith (argv[i], "--em"))
145 break;
146
147 if (i == argc)
148 goto do_default;
149
150 p = strchr (argv[i], '=');
151 if (p)
152 p++;
153 else
154 p = argv[i + 1];
155
156 if (!p || !*p)
157 as_fatal (_("missing emulation mode name"));
158 em = p;
159
160 do_default:
161 if (em == 0)
162 em = getenv (EMULATION_ENVIRON);
163 if (em == 0)
164 em = DEFAULT_EMULATION;
165
166 if (em)
167 {
168 for (i = 0; i < n_emulations; i++)
169 if (!strcmp (emulations[i]->name, em))
170 break;
171 if (i == n_emulations)
172 as_fatal (_("unrecognized emulation name `%s'"), em);
173 this_emulation = emulations[i];
174 }
175 else
176 this_emulation = emulations[0];
177
178 this_emulation->init ();
179 }
180
181 void
182 common_emul_init (void)
183 {
184 this_format = this_emulation->format;
185
186 if (this_emulation->leading_underscore == 2)
187 this_emulation->leading_underscore = this_format->dfl_leading_underscore;
188
189 if (this_emulation->default_endian != 2)
190 target_big_endian = this_emulation->default_endian;
191
192 if (this_emulation->fake_label_name == 0)
193 {
194 if (this_emulation->leading_underscore)
195 this_emulation->fake_label_name = FAKE_LABEL_NAME;
196 else
197 /* What other parameters should we test? */
198 this_emulation->fake_label_name = "." FAKE_LABEL_NAME;
199 }
200 }
201 #endif
202
203 void
204 print_version_id (void)
205 {
206 static int printed;
207
208 if (printed)
209 return;
210 printed = 1;
211
212 fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s\n"),
213 VERSION, TARGET_ALIAS, BFD_VERSION_STRING);
214 }
215
216 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
217 enum compressed_debug_section_type flag_compress_debug
218 = DEFAULT_COMPRESSED_DEBUG_ALGORITHM;
219 #define DEFAULT_COMPRESSED_DEBUG_ALGORITHM_HELP \
220 DEFAULT_COMPRESSED_DEBUG_ALGORITHM
221 #else
222 #define DEFAULT_COMPRESSED_DEBUG_ALGORITHM_HELP COMPRESS_DEBUG_NONE
223 #endif
224
225 static void
226 show_usage (FILE * stream)
227 {
228 fprintf (stream, _("Usage: %s [option...] [asmfile...]\n"), myname);
229
230 fprintf (stream, _("\
231 Options:\n\
232 -a[sub-option...] turn on listings\n\
233 Sub-options [default hls]:\n\
234 c omit false conditionals\n\
235 d omit debugging directives\n\
236 g include general info\n\
237 h include high-level source\n\
238 i include ginsn and synthesized CFI info\n\
239 l include assembly\n\
240 m include macro expansions\n\
241 n omit forms processing\n\
242 s include symbols\n\
243 =FILE list to FILE (must be last sub-option)\n"));
244
245 fprintf (stream, _("\
246 --alternate initially turn on alternate macro syntax\n"));
247 fprintf (stream, _("\
248 --compress-debug-sections[={none|zlib|zlib-gnu|zlib-gabi|zstd}]\n\
249 compress DWARF debug sections\n")),
250 fprintf (stream, _("\
251 Default: %s\n"),
252 bfd_get_compression_algorithm_name
253 (DEFAULT_COMPRESSED_DEBUG_ALGORITHM_HELP));
254
255 fprintf (stream, _("\
256 --nocompress-debug-sections\n\
257 don't compress DWARF debug sections\n"));
258 fprintf (stream, _("\
259 -D produce assembler debugging messages\n"));
260 fprintf (stream, _("\
261 --dump-config display how the assembler is configured and then exit\n"));
262 fprintf (stream, _("\
263 --debug-prefix-map OLD=NEW\n\
264 map OLD to NEW in debug information\n"));
265 fprintf (stream, _("\
266 --defsym SYM=VAL define symbol SYM to given value\n"));
267 #ifdef USE_EMULATIONS
268 {
269 int i;
270 const char *def_em;
271
272 fprintf (stream, "\
273 --emulation=[");
274 for (i = 0; i < n_emulations - 1; i++)
275 fprintf (stream, "%s | ", emulations[i]->name);
276 fprintf (stream, "%s]\n", emulations[i]->name);
277
278 def_em = getenv (EMULATION_ENVIRON);
279 if (!def_em)
280 def_em = DEFAULT_EMULATION;
281 fprintf (stream, _("\
282 emulate output (default %s)\n"), def_em);
283 }
284 #endif
285 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
286 fprintf (stream, _("\
287 --execstack require executable stack for this object\n"));
288 fprintf (stream, _("\
289 --noexecstack don't require executable stack for this object\n"));
290 fprintf (stream, _("\
291 --size-check=[error|warning]\n\
292 ELF .size directive check (default --size-check=error)\n"));
293 fprintf (stream, _("\
294 --elf-stt-common=[no|yes] "));
295 if (DEFAULT_GENERATE_ELF_STT_COMMON)
296 fprintf (stream, _("(default: yes)\n"));
297 else
298 fprintf (stream, _("(default: no)\n"));
299 fprintf (stream, _("\
300 generate ELF common symbols with STT_COMMON type\n"));
301 fprintf (stream, _("\
302 --sectname-subst enable section name substitution sequences\n"));
303
304 fprintf (stream, _("\
305 --generate-missing-build-notes=[no|yes] "));
306 #if DEFAULT_GENERATE_BUILD_NOTES
307 fprintf (stream, _("(default: yes)\n"));
308 #else
309 fprintf (stream, _("(default: no)\n"));
310 #endif
311 fprintf (stream, _("\
312 generate GNU Build notes if none are present in the input\n"));
313 fprintf (stream, _("\
314 --gsframe generate SFrame stack trace information\n"));
315 # if defined (TARGET_USE_SCFI) && defined (TARGET_USE_GINSN)
316 fprintf (stream, _("\
317 --scfi=experimental Synthesize DWARF CFI for hand-written asm\n\
318 (experimental support)\n"));
319 # endif
320 #endif /* OBJ_ELF */
321
322 fprintf (stream, _("\
323 -f skip whitespace and comment preprocessing\n"));
324 fprintf (stream, _("\
325 -g, --gen-debug generate debugging information\n"));
326 fprintf (stream, _("\
327 --gstabs generate STABS debugging information\n"));
328 fprintf (stream, _("\
329 --gstabs+ generate STABS debug info with GNU extensions\n"));
330 fprintf (stream, _("\
331 --gdwarf-<N> generate DWARF<N> debugging information. 2 <= <N> <= 5\n"));
332 fprintf (stream, _("\
333 --gdwarf-cie-version=<N> generate version 1, 3 or 4 DWARF CIEs\n"));
334 fprintf (stream, _("\
335 --gdwarf-sections generate per-function section names for DWARF line information\n"));
336 #if defined (TE_PE) && defined (O_secrel)
337 fprintf (stream, _("\
338 --gcodeview generate CodeView debugging information\n"));
339 #endif
340 fprintf (stream, _("\
341 --hash-size=<N> ignored\n"));
342 fprintf (stream, _("\
343 --help show all assembler options\n"));
344 fprintf (stream, _("\
345 --target-help show target specific options\n"));
346 fprintf (stream, _("\
347 -I DIR add DIR to search list for .include directives\n"));
348 fprintf (stream, _("\
349 -J don't warn about signed overflow\n"));
350 fprintf (stream, _("\
351 -K warn when differences altered for long displacements\n"));
352 fprintf (stream, _("\
353 -L, --keep-locals keep local symbols (e.g. starting with `L')\n"));
354 fprintf (stream, _("\
355 -M, --mri assemble in MRI compatibility mode\n"));
356 fprintf (stream, _("\
357 --MD FILE write dependency information in FILE (default none)\n"));
358 fprintf (stream, _("\
359 --multibyte-handling=<method>\n\
360 what to do with multibyte characters encountered in the input\n"));
361 fprintf (stream, _("\
362 -nocpp ignored\n"));
363 fprintf (stream, _("\
364 -no-pad-sections do not pad the end of sections to alignment boundaries\n"));
365 fprintf (stream, _("\
366 -o OBJFILE name the object-file output OBJFILE (default a.out)\n"));
367 fprintf (stream, _("\
368 -R fold data section into text section\n"));
369 fprintf (stream, _("\
370 --reduce-memory-overheads ignored\n"));
371 fprintf (stream, _("\
372 --statistics print various measured statistics from execution\n"));
373 fprintf (stream, _("\
374 --strip-local-absolute strip local absolute symbols\n"));
375 fprintf (stream, _("\
376 --traditional-format Use same format as native assembler when possible\n"));
377 fprintf (stream, _("\
378 --version print assembler version number and exit\n"));
379 fprintf (stream, _("\
380 -W, --no-warn suppress warnings\n"));
381 fprintf (stream, _("\
382 --warn don't suppress warnings\n"));
383 fprintf (stream, _("\
384 --fatal-warnings treat warnings as errors\n"));
385 fprintf (stream, _("\
386 --no-info suppress information messages\n"));
387 fprintf (stream, _("\
388 --info don't suppress information messages\n"));
389 #ifdef HAVE_ITBL_CPU
390 fprintf (stream, _("\
391 --itbl INSTTBL extend instruction set to include instructions\n\
392 matching the specifications defined in file INSTTBL\n"));
393 #endif
394 fprintf (stream, _("\
395 -w ignored\n"));
396 fprintf (stream, _("\
397 -X ignored\n"));
398 fprintf (stream, _("\
399 -Z generate object file even after errors\n"));
400 fprintf (stream, _("\
401 --listing-lhs-width set the width in words of the output data column of\n\
402 the listing\n"));
403 fprintf (stream, _("\
404 --listing-lhs-width2 set the width in words of the continuation lines\n\
405 of the output data column; ignored if smaller than\n\
406 the width of the first line\n"));
407 fprintf (stream, _("\
408 --listing-rhs-width set the max width in characters of the lines from\n\
409 the source file\n"));
410 fprintf (stream, _("\
411 --listing-cont-lines set the maximum number of continuation lines used\n\
412 for the output data column of the listing\n"));
413 fprintf (stream, _("\
414 @FILE read options from FILE\n"));
415
416 md_show_usage (stream);
417
418 fputc ('\n', stream);
419
420 if (REPORT_BUGS_TO[0] && stream == stdout)
421 fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
422 }
423
424 /* Since it is easy to do here we interpret the special arg "-"
425 to mean "use stdin" and we set that argv[] pointing to "".
426 After we have munged argv[], the only things left are source file
427 name(s) and ""(s) denoting stdin. These file names are used
428 (perhaps more than once) later.
429
430 check for new machine-dep cmdline options in
431 md_parse_option definitions in config/tc-*.c. */
432
433 static void
434 parse_args (int * pargc, char *** pargv)
435 {
436 int old_argc;
437 int new_argc;
438 char ** old_argv;
439 char ** new_argv;
440 /* Starting the short option string with '-' is for programs that
441 expect options and other ARGV-elements in any order and that care about
442 the ordering of the two. We describe each non-option ARGV-element
443 as if it were the argument of an option with character code 1. */
444 char *shortopts;
445 static const char std_shortopts[] =
446 {
447 '-', 'J',
448 #ifndef WORKING_DOT_WORD
449 /* -K is not meaningful if .word is not being hacked. */
450 'K',
451 #endif
452 'L', 'M', 'R', 'W', 'Z', 'a', ':', ':', 'D', 'f', 'g', ':',':', 'I', ':',
453 'o', ':', 'v', 'w', 'X',
454 #ifdef HAVE_ITBL_CPU
455 /* New option for extending instruction set (see also --itbl below). */
456 't', ':',
457 #endif
458 '\0'
459 };
460 struct option *longopts;
461 /* Codes used for the long options with no short synonyms. */
462 enum option_values
463 {
464 OPTION_HELP = OPTION_STD_BASE,
465 OPTION_NOCPP,
466 OPTION_STATISTICS,
467 OPTION_VERSION,
468 OPTION_DUMPCONFIG,
469 OPTION_EMULATION,
470 OPTION_DEBUG_PREFIX_MAP,
471 OPTION_DEFSYM,
472 OPTION_LISTING_LHS_WIDTH,
473 OPTION_LISTING_LHS_WIDTH2, /* = STD_BASE + 10 */
474 OPTION_LISTING_RHS_WIDTH,
475 OPTION_LISTING_CONT_LINES,
476 OPTION_DEPFILE,
477 OPTION_GSTABS,
478 OPTION_GSTABS_PLUS,
479 OPTION_GDWARF_2,
480 OPTION_GDWARF_3,
481 OPTION_GDWARF_4,
482 OPTION_GDWARF_5,
483 OPTION_GDWARF_SECTIONS, /* = STD_BASE + 20 */
484 OPTION_GDWARF_CIE_VERSION,
485 OPTION_GCODEVIEW,
486 OPTION_STRIP_LOCAL_ABSOLUTE,
487 OPTION_TRADITIONAL_FORMAT,
488 OPTION_WARN,
489 OPTION_TARGET_HELP,
490 OPTION_EXECSTACK,
491 OPTION_NOEXECSTACK,
492 OPTION_SIZE_CHECK,
493 OPTION_ELF_STT_COMMON,
494 OPTION_ELF_BUILD_NOTES, /* = STD_BASE + 30 */
495 OPTION_SECTNAME_SUBST,
496 OPTION_ALTERNATE,
497 OPTION_AL,
498 OPTION_HASH_TABLE_SIZE,
499 OPTION_REDUCE_MEMORY_OVERHEADS,
500 OPTION_WARN_FATAL,
501 OPTION_COMPRESS_DEBUG,
502 OPTION_NOCOMPRESS_DEBUG,
503 OPTION_NO_PAD_SECTIONS,
504 OPTION_MULTIBYTE_HANDLING, /* = STD_BASE + 40 */
505 OPTION_SFRAME,
506 OPTION_SCFI,
507 OPTION_INFO,
508 OPTION_NOINFO
509 /* When you add options here, check that they do
510 not collide with OPTION_MD_BASE. See as.h. */
511 };
512
513 static const struct option std_longopts[] =
514 {
515 /* Note: commas are placed at the start of the line rather than
516 the end of the preceding line so that it is simpler to
517 selectively add and remove lines from this list. */
518 {"alternate", no_argument, NULL, OPTION_ALTERNATE}
519 /* The entry for "a" is here to prevent getopt_long_only() from
520 considering that -a is an abbreviation for --alternate. This is
521 necessary because -a=<FILE> is a valid switch but getopt would
522 normally reject it since --alternate does not take an argument. */
523 ,{"a", optional_argument, NULL, 'a'}
524 /* Handle -al=<FILE>. */
525 ,{"al", optional_argument, NULL, OPTION_AL}
526 ,{"compress-debug-sections", optional_argument, NULL, OPTION_COMPRESS_DEBUG}
527 ,{"nocompress-debug-sections", no_argument, NULL, OPTION_NOCOMPRESS_DEBUG}
528 ,{"debug-prefix-map", required_argument, NULL, OPTION_DEBUG_PREFIX_MAP}
529 ,{"defsym", required_argument, NULL, OPTION_DEFSYM}
530 ,{"dump-config", no_argument, NULL, OPTION_DUMPCONFIG}
531 ,{"emulation", required_argument, NULL, OPTION_EMULATION}
532 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
533 ,{"execstack", no_argument, NULL, OPTION_EXECSTACK}
534 ,{"noexecstack", no_argument, NULL, OPTION_NOEXECSTACK}
535 ,{"size-check", required_argument, NULL, OPTION_SIZE_CHECK}
536 ,{"elf-stt-common", required_argument, NULL, OPTION_ELF_STT_COMMON}
537 ,{"sectname-subst", no_argument, NULL, OPTION_SECTNAME_SUBST}
538 ,{"generate-missing-build-notes", required_argument, NULL, OPTION_ELF_BUILD_NOTES}
539 ,{"gsframe", no_argument, NULL, OPTION_SFRAME}
540 # if defined (TARGET_USE_SCFI) && defined (TARGET_USE_GINSN)
541 ,{"scfi", required_argument, NULL, OPTION_SCFI}
542 # endif
543 #endif /* OBJ_ELF || OBJ_MAYBE_ELF. */
544 ,{"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
545 ,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF_2}
546 ,{"gdwarf-3", no_argument, NULL, OPTION_GDWARF_3}
547 ,{"gdwarf-4", no_argument, NULL, OPTION_GDWARF_4}
548 ,{"gdwarf-5", no_argument, NULL, OPTION_GDWARF_5}
549 /* GCC uses --gdwarf-2 but GAS used to to use --gdwarf2,
550 so we keep it here for backwards compatibility. */
551 ,{"gdwarf2", no_argument, NULL, OPTION_GDWARF_2}
552 ,{"gdwarf-sections", no_argument, NULL, OPTION_GDWARF_SECTIONS}
553 ,{"gdwarf-cie-version", required_argument, NULL, OPTION_GDWARF_CIE_VERSION}
554 #if defined (TE_PE) && defined (O_secrel)
555 ,{"gcodeview", no_argument, NULL, OPTION_GCODEVIEW}
556 #endif
557 ,{"gen-debug", no_argument, NULL, 'g'}
558 ,{"gstabs", no_argument, NULL, OPTION_GSTABS}
559 ,{"gstabs+", no_argument, NULL, OPTION_GSTABS_PLUS}
560 ,{"hash-size", required_argument, NULL, OPTION_HASH_TABLE_SIZE}
561 ,{"help", no_argument, NULL, OPTION_HELP}
562 #ifdef HAVE_ITBL_CPU
563 /* New option for extending instruction set (see also -t above).
564 The "-t file" or "--itbl file" option extends the basic set of
565 valid instructions by reading "file", a text file containing a
566 list of instruction formats. The additional opcodes and their
567 formats are added to the built-in set of instructions, and
568 mnemonics for new registers may also be defined. */
569 ,{"itbl", required_argument, NULL, 't'}
570 #endif
571 /* getopt allows abbreviations, so we do this to stop it from
572 treating -k as an abbreviation for --keep-locals. Some
573 ports use -k to enable PIC assembly. */
574 ,{"keep-locals", no_argument, NULL, 'L'}
575 ,{"keep-locals", no_argument, NULL, 'L'}
576 ,{"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH}
577 ,{"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2}
578 ,{"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH}
579 ,{"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES}
580 ,{"MD", required_argument, NULL, OPTION_DEPFILE}
581 ,{"mri", no_argument, NULL, 'M'}
582 ,{"nocpp", no_argument, NULL, OPTION_NOCPP}
583 ,{"no-pad-sections", no_argument, NULL, OPTION_NO_PAD_SECTIONS}
584 ,{"no-info", no_argument, NULL, OPTION_NOINFO}
585 ,{"no-warn", no_argument, NULL, 'W'}
586 ,{"reduce-memory-overheads", no_argument, NULL, OPTION_REDUCE_MEMORY_OVERHEADS}
587 ,{"statistics", no_argument, NULL, OPTION_STATISTICS}
588 ,{"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE}
589 ,{"version", no_argument, NULL, OPTION_VERSION}
590 ,{"verbose", no_argument, NULL, 'v'}
591 ,{"target-help", no_argument, NULL, OPTION_TARGET_HELP}
592 ,{"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT}
593 ,{"info", no_argument, NULL, OPTION_INFO}
594 ,{"warn", no_argument, NULL, OPTION_WARN}
595 ,{"multibyte-handling", required_argument, NULL, OPTION_MULTIBYTE_HANDLING}
596 };
597
598 /* Construct the option lists from the standard list and the target
599 dependent list. Include space for an extra NULL option and
600 always NULL terminate. */
601 shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
602 longopts = (struct option *) xmalloc (sizeof (std_longopts)
603 + md_longopts_size + sizeof (struct option));
604 memcpy (longopts, std_longopts, sizeof (std_longopts));
605 memcpy (((char *) longopts) + sizeof (std_longopts), md_longopts, md_longopts_size);
606 memset (((char *) longopts) + sizeof (std_longopts) + md_longopts_size,
607 0, sizeof (struct option));
608
609 /* Make a local copy of the old argv. */
610 old_argc = *pargc;
611 old_argv = *pargv;
612
613 /* Initialize a new argv that contains no options. */
614 new_argv = notes_alloc (sizeof (char *) * (old_argc + 1));
615 new_argv[0] = old_argv[0];
616 new_argc = 1;
617 new_argv[new_argc] = NULL;
618
619 while (1)
620 {
621 /* getopt_long_only is like getopt_long, but '-' as well as '--' can
622 indicate a long option. */
623 int longind;
624 int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
625 &longind);
626
627 if (optc == -1)
628 break;
629
630 switch (optc)
631 {
632 default:
633 /* md_parse_option should return 1 if it recognizes optc,
634 0 if not. */
635 if (md_parse_option (optc, optarg) != 0)
636 break;
637 /* `-v' isn't included in the general short_opts list, so check for
638 it explicitly here before deciding we've gotten a bad argument. */
639 if (optc == 'v')
640 {
641 case 'v':
642 print_version_id ();
643 verbose = 1;
644 break;
645 }
646 else if (is_a_char (optc))
647 as_bad (_("unrecognized option `-%c%s'"), optc, optarg ? optarg : "");
648 else if (optarg)
649 as_bad (_("unrecognized option `--%s=%s'"), longopts[longind].name, optarg);
650 else
651 as_bad (_("unrecognized option `--%s'"), longopts[longind].name);
652 /* Fall through. */
653
654 case '?':
655 exit (EXIT_FAILURE);
656
657 case 1: /* File name. */
658 if (!strcmp (optarg, "-"))
659 optarg = (char *) "";
660 new_argv[new_argc++] = optarg;
661 new_argv[new_argc] = NULL;
662 break;
663
664 case OPTION_TARGET_HELP:
665 md_show_usage (stdout);
666 exit (EXIT_SUCCESS);
667
668 case OPTION_HELP:
669 show_usage (stdout);
670 exit (EXIT_SUCCESS);
671
672 case OPTION_NOCPP:
673 break;
674
675 case OPTION_NO_PAD_SECTIONS:
676 do_not_pad_sections_to_alignment = 1;
677 break;
678
679 case OPTION_STATISTICS:
680 flag_print_statistics = 1;
681 break;
682
683 case OPTION_STRIP_LOCAL_ABSOLUTE:
684 flag_strip_local_absolute = 1;
685 break;
686
687 case OPTION_TRADITIONAL_FORMAT:
688 flag_traditional_format = 1;
689 break;
690
691 case OPTION_MULTIBYTE_HANDLING:
692 if (strcmp (optarg, "allow") == 0)
693 multibyte_handling = multibyte_allow;
694 else if (strcmp (optarg, "warn") == 0)
695 multibyte_handling = multibyte_warn;
696 else if (strcmp (optarg, "warn-sym-only") == 0)
697 multibyte_handling = multibyte_warn_syms;
698 else if (strcmp (optarg, "warn_sym_only") == 0)
699 multibyte_handling = multibyte_warn_syms;
700 else
701 as_fatal (_("unexpected argument to --multibyte-input-option: '%s'"), optarg);
702 break;
703
704 case OPTION_VERSION:
705 /* This output is intended to follow the GNU standards document. */
706 printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
707 printf (_("Copyright (C) 2025 Free Software Foundation, Inc.\n"));
708 printf (_("\
709 This program is free software; you may redistribute it under the terms of\n\
710 the GNU General Public License version 3 or later.\n\
711 This program has absolutely no warranty.\n"));
712 #ifdef TARGET_WITH_CPU
713 printf (_("This assembler was configured for a target of `%s' "
714 "and default,\ncpu type `%s'.\n"),
715 TARGET_ALIAS, TARGET_WITH_CPU);
716 #else
717 printf (_("This assembler was configured for a target of `%s'.\n"),
718 TARGET_ALIAS);
719 #endif
720 exit (EXIT_SUCCESS);
721
722 case OPTION_EMULATION:
723 #ifdef USE_EMULATIONS
724 if (strcmp (optarg, this_emulation->name))
725 as_fatal (_("multiple emulation names specified"));
726 #else
727 as_fatal (_("emulations not handled in this configuration"));
728 #endif
729 break;
730
731 case OPTION_DUMPCONFIG:
732 fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
733 fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
734 fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
735 #ifdef TARGET_OBJ_FORMAT
736 fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
737 #endif
738 #ifdef TARGET_FORMAT
739 fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
740 #endif
741 exit (EXIT_SUCCESS);
742
743 case OPTION_COMPRESS_DEBUG:
744 if (optarg)
745 {
746 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
747 flag_compress_debug = bfd_get_compression_algorithm (optarg);
748 #ifndef HAVE_ZSTD
749 if (flag_compress_debug == COMPRESS_DEBUG_ZSTD)
750 as_fatal (_ ("--compress-debug-sections=zstd: gas is not "
751 "built with zstd support"));
752 #endif
753 if (flag_compress_debug == COMPRESS_UNKNOWN)
754 as_fatal (_("Invalid --compress-debug-sections option: `%s'"),
755 optarg);
756 #else
757 as_fatal (_("--compress-debug-sections=%s is unsupported"),
758 optarg);
759 #endif
760 }
761 else
762 flag_compress_debug = DEFAULT_COMPRESSED_DEBUG_ALGORITHM;
763 break;
764
765 case OPTION_NOCOMPRESS_DEBUG:
766 flag_compress_debug = COMPRESS_DEBUG_NONE;
767 break;
768
769 case OPTION_DEBUG_PREFIX_MAP:
770 add_debug_prefix_map (optarg);
771 break;
772
773 case OPTION_DEFSYM:
774 {
775 char *s;
776 valueT i;
777 struct defsym_list *n;
778
779 for (s = optarg; *s != '\0' && *s != '='; s++)
780 ;
781 if (*s == '\0')
782 as_fatal (_("bad defsym; format is --defsym name=value"));
783 *s++ = '\0';
784 i = bfd_scan_vma (s, (const char **) NULL, 0);
785 n = XNEW (struct defsym_list);
786 n->next = defsyms;
787 n->name = optarg;
788 n->value = i;
789 defsyms = n;
790 }
791 break;
792
793 #ifdef HAVE_ITBL_CPU
794 case 't':
795 {
796 /* optarg is the name of the file containing the instruction
797 formats, opcodes, register names, etc. */
798 if (optarg == NULL)
799 {
800 as_warn (_("no file name following -t option"));
801 break;
802 }
803
804 /* Parse the file and add the new instructions to our internal
805 table. If multiple instruction tables are specified, the
806 information from this table gets appended onto the existing
807 internal table. */
808 if (itbl_parse (optarg) != 0)
809 as_fatal (_("failed to read instruction table %s\n"),
810 optarg);
811 }
812 break;
813 #endif
814
815 case OPTION_DEPFILE:
816 start_dependencies (optarg);
817 break;
818
819 case 'g':
820 /* Some backends, eg Alpha and Mips, use the -g switch for their
821 own purposes. So we check here for an explicit -g and allow
822 the backend to decide if it wants to process it. */
823 if ( old_argv[optind - 1][1] == 'g'
824 && md_parse_option (optc, optarg))
825 continue;
826
827 /* We end up here for any -gsomething-not-already-a-long-option.
828 give some useful feedback on not (yet) supported -gdwarfxxx
829 versions/sections/options. */
830 if (startswith (old_argv[optind - 1], "-gdwarf"))
831 as_fatal (_("unknown DWARF option %s\n"), old_argv[optind - 1]);
832 else if (old_argv[optind - 1][1] == 'g' && optarg != NULL)
833 as_fatal (_("unknown option `%s'"), old_argv[optind - 1]);
834
835 if (md_debug_format_selector)
836 debug_type = md_debug_format_selector (& use_gnu_debug_info_extensions);
837 else if (IS_ELF)
838 {
839 debug_type = DEBUG_DWARF2;
840 dwarf_level = 2;
841 }
842 else
843 debug_type = DEBUG_STABS;
844 break;
845
846 case OPTION_GSTABS_PLUS:
847 use_gnu_debug_info_extensions = 1;
848 /* Fall through. */
849 case OPTION_GSTABS:
850 debug_type = DEBUG_STABS;
851 break;
852
853 case OPTION_GDWARF_2:
854 debug_type = DEBUG_DWARF2;
855 dwarf_level = 2;
856 break;
857
858 case OPTION_GDWARF_3:
859 debug_type = DEBUG_DWARF2;
860 dwarf_level = 3;
861 break;
862
863 case OPTION_GDWARF_4:
864 debug_type = DEBUG_DWARF2;
865 dwarf_level = 4;
866 break;
867
868 case OPTION_GDWARF_5:
869 debug_type = DEBUG_DWARF2;
870 dwarf_level = 5;
871 break;
872
873 case OPTION_GDWARF_SECTIONS:
874 flag_dwarf_sections = true;
875 break;
876
877 #if defined (TE_PE) && defined (O_secrel)
878 case OPTION_GCODEVIEW:
879 debug_type = DEBUG_CODEVIEW;
880 break;
881 #endif
882
883 case OPTION_GDWARF_CIE_VERSION:
884 flag_dwarf_cie_version = atoi (optarg);
885 /* The available CIE versions are 1 (DWARF 2), 3 (DWARF 3), and 4
886 (DWARF 4 and 5). */
887 if (flag_dwarf_cie_version < 1
888 || flag_dwarf_cie_version == 2
889 || flag_dwarf_cie_version > 4)
890 as_fatal (_("Invalid --gdwarf-cie-version `%s'"), optarg);
891 switch (flag_dwarf_cie_version)
892 {
893 case 1:
894 if (dwarf_level < 2)
895 dwarf_level = 2;
896 break;
897 case 3:
898 if (dwarf_level < 3)
899 dwarf_level = 3;
900 break;
901 default:
902 if (dwarf_level < 4)
903 dwarf_level = 4;
904 break;
905 }
906 break;
907
908 case 'J':
909 flag_signed_overflow_ok = 1;
910 break;
911
912 #ifndef WORKING_DOT_WORD
913 case 'K':
914 flag_warn_displacement = 1;
915 break;
916 #endif
917 case 'L':
918 flag_keep_locals = 1;
919 break;
920
921 case OPTION_LISTING_LHS_WIDTH:
922 listing_lhs_width = atoi (optarg);
923 if (listing_lhs_width_second < listing_lhs_width)
924 listing_lhs_width_second = listing_lhs_width;
925 break;
926 case OPTION_LISTING_LHS_WIDTH2:
927 {
928 int tmp = atoi (optarg);
929
930 if (tmp > listing_lhs_width)
931 listing_lhs_width_second = tmp;
932 }
933 break;
934 case OPTION_LISTING_RHS_WIDTH:
935 listing_rhs_width = atoi (optarg);
936 break;
937 case OPTION_LISTING_CONT_LINES:
938 listing_lhs_cont_lines = atoi (optarg);
939 break;
940
941 case 'M':
942 flag_mri = 1;
943 #ifdef TC_M68K
944 flag_m68k_mri = 1;
945 #endif
946 break;
947
948 case 'R':
949 flag_readonly_data_in_text = 1;
950 break;
951
952 case 'W':
953 flag_no_warnings = 1;
954 break;
955
956 case OPTION_WARN:
957 flag_no_warnings = 0;
958 flag_fatal_warnings = 0;
959 break;
960
961 case OPTION_WARN_FATAL:
962 flag_no_warnings = 0;
963 flag_fatal_warnings = 1;
964 break;
965
966 case OPTION_NOINFO:
967 flag_no_information = true;
968 break;
969
970 case OPTION_INFO:
971 flag_no_information = false;
972 break;
973
974 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
975 case OPTION_EXECSTACK:
976 flag_execstack = 1;
977 flag_noexecstack = 0;
978 break;
979
980 case OPTION_NOEXECSTACK:
981 flag_noexecstack = 1;
982 flag_execstack = 0;
983 break;
984
985 # if defined (TARGET_USE_SCFI) && defined (TARGET_USE_GINSN)
986 case OPTION_SCFI:
987 if (optarg && strcasecmp (optarg, "experimental") == 0)
988 flag_synth_cfi = SYNTH_CFI_EXPERIMENTAL;
989 else
990 as_fatal (_("Invalid --scfi= option: `%s'; suggested option: experimental"),
991 optarg);
992 break;
993 # endif
994
995 case OPTION_SIZE_CHECK:
996 if (strcasecmp (optarg, "error") == 0)
997 flag_allow_nonconst_size = false;
998 else if (strcasecmp (optarg, "warning") == 0)
999 flag_allow_nonconst_size = true;
1000 else
1001 as_fatal (_("Invalid --size-check= option: `%s'"), optarg);
1002 break;
1003
1004 case OPTION_ELF_STT_COMMON:
1005 if (strcasecmp (optarg, "no") == 0)
1006 flag_use_elf_stt_common = 0;
1007 else if (strcasecmp (optarg, "yes") == 0)
1008 flag_use_elf_stt_common = 1;
1009 else
1010 as_fatal (_("Invalid --elf-stt-common= option: `%s'"),
1011 optarg);
1012 break;
1013
1014 case OPTION_SECTNAME_SUBST:
1015 flag_sectname_subst = 1;
1016 break;
1017
1018 case OPTION_ELF_BUILD_NOTES:
1019 if (strcasecmp (optarg, "no") == 0)
1020 flag_generate_build_notes = false;
1021 else if (strcasecmp (optarg, "yes") == 0)
1022 flag_generate_build_notes = true;
1023 else
1024 as_fatal (_("Invalid --generate-missing-build-notes option: `%s'"),
1025 optarg);
1026 break;
1027
1028 case OPTION_SFRAME:
1029 flag_gen_sframe = 1;
1030 break;
1031
1032 #endif /* OBJ_ELF */
1033
1034 case 'Z':
1035 flag_always_generate_output = 1;
1036 break;
1037
1038 case OPTION_AL:
1039 listing |= LISTING_LISTING;
1040 if (optarg)
1041 listing_filename = notes_strdup (optarg);
1042 break;
1043
1044 case OPTION_ALTERNATE:
1045 optarg = old_argv [optind - 1];
1046 while (* optarg == '-')
1047 optarg ++;
1048
1049 if (strcmp (optarg, "alternate") == 0)
1050 {
1051 flag_macro_alternate = 1;
1052 break;
1053 }
1054 optarg ++;
1055 /* Fall through. */
1056
1057 case 'a':
1058 if (optarg)
1059 {
1060 if (optarg != old_argv[optind] && optarg[-1] == '=')
1061 --optarg;
1062
1063 if (md_parse_option (optc, optarg) != 0)
1064 break;
1065
1066 while (*optarg)
1067 {
1068 switch (*optarg)
1069 {
1070 case 'c':
1071 listing |= LISTING_NOCOND;
1072 break;
1073 case 'd':
1074 listing |= LISTING_NODEBUG;
1075 break;
1076 case 'g':
1077 listing |= LISTING_GENERAL;
1078 break;
1079 case 'h':
1080 listing |= LISTING_HLL;
1081 break;
1082 case 'i':
1083 listing |= LISTING_GINSN_SCFI;
1084 break;
1085 case 'l':
1086 listing |= LISTING_LISTING;
1087 break;
1088 case 'm':
1089 listing |= LISTING_MACEXP;
1090 break;
1091 case 'n':
1092 listing |= LISTING_NOFORM;
1093 break;
1094 case 's':
1095 listing |= LISTING_SYMBOLS;
1096 break;
1097 case '=':
1098 listing_filename = notes_strdup (optarg + 1);
1099 optarg += strlen (listing_filename);
1100 break;
1101 default:
1102 as_fatal (_("invalid listing option `%c'"), *optarg);
1103 break;
1104 }
1105 optarg++;
1106 }
1107 }
1108 if (!listing)
1109 listing = LISTING_DEFAULT;
1110 break;
1111
1112 case 'D':
1113 /* DEBUG is implemented: it debugs different
1114 things from other people's assemblers. */
1115 flag_debug = 1;
1116 break;
1117
1118 case 'f':
1119 flag_no_comments = 1;
1120 break;
1121
1122 case 'I':
1123 { /* Include file directory. */
1124 char *temp = notes_strdup (optarg);
1125
1126 add_include_dir (temp);
1127 break;
1128 }
1129
1130 case 'o':
1131 out_file_name = notes_strdup (optarg);
1132 break;
1133
1134 case 'w':
1135 break;
1136
1137 case 'X':
1138 /* -X means treat warnings as errors. */
1139 break;
1140
1141 case OPTION_REDUCE_MEMORY_OVERHEADS:
1142 break;
1143
1144 case OPTION_HASH_TABLE_SIZE:
1145 break;
1146 }
1147 }
1148
1149 free (shortopts);
1150 free (longopts);
1151
1152 *pargc = new_argc;
1153 *pargv = new_argv;
1154
1155 #ifdef md_after_parse_args
1156 md_after_parse_args ();
1157 #endif
1158 }
1159
1160 static void
1161 dump_statistics (void)
1162 {
1163 long run_time = get_run_time () - start_time;
1164
1165 fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
1166 myname, run_time / 1000000, run_time % 1000000);
1167
1168 subsegs_print_statistics (stderr);
1169 write_print_statistics (stderr);
1170 symbol_print_statistics (stderr);
1171 read_print_statistics (stderr);
1172
1173 #ifdef tc_print_statistics
1174 tc_print_statistics (stderr);
1175 #endif
1176
1177 #ifdef obj_print_statistics
1178 obj_print_statistics (stderr);
1179 #endif
1180 }
1181 \f
1182 /* Here to attempt 1 pass over each input file.
1183 We scan argv[*] looking for filenames or exactly "" which is
1184 shorthand for stdin. Any argv that is NULL is not a file-name.
1185 We set need_pass_2 TRUE if, after this, we still have unresolved
1186 expressions of the form (unknown value)+-(unknown value).
1187
1188 Note the un*x semantics: there is only 1 logical input file, but it
1189 may be a catenation of many 'physical' input files. */
1190
1191 static void
1192 perform_an_assembly_pass (int argc, char ** argv)
1193 {
1194 int saw_a_file = 0;
1195
1196 need_pass_2 = 0;
1197
1198 #ifndef OBJ_MACH_O
1199 subseg_set (text_section, 0);
1200 #endif
1201
1202 /* This may add symbol table entries, which requires having an open BFD,
1203 and sections already created. */
1204 md_begin ();
1205
1206 #ifdef USING_CGEN
1207 gas_cgen_begin ();
1208 #endif
1209 #ifdef obj_begin
1210 obj_begin ();
1211 #endif
1212
1213 /* Skip argv[0]. */
1214 argv++;
1215 argc--;
1216
1217 while (argc--)
1218 {
1219 if (*argv)
1220 { /* Is it a file-name argument? */
1221 saw_a_file++;
1222 /* argv->"" if stdin desired, else->filename. */
1223 read_a_source_file (*argv);
1224 }
1225 argv++; /* Completed that argv. */
1226 }
1227 if (!saw_a_file)
1228 read_a_source_file ("");
1229 }
1230
1231 static void
1232 free_notes (void)
1233 {
1234 _obstack_free (&notes, NULL);
1235 }
1236
1237 /* Early initialisation, before gas prints messages. */
1238
1239 static void
1240 gas_early_init (int *argcp, char ***argvp)
1241 {
1242 start_time = get_run_time ();
1243 signal_init ();
1244
1245 #ifdef HAVE_LC_MESSAGES
1246 setlocale (LC_MESSAGES, "");
1247 #endif
1248 setlocale (LC_CTYPE, "");
1249 bindtextdomain (PACKAGE, LOCALEDIR);
1250 textdomain (PACKAGE);
1251
1252 if (debug_memory)
1253 chunksize = 64;
1254
1255 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
1256 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
1257 #endif
1258
1259 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
1260
1261 hex_init ();
1262 if (bfd_init () != BFD_INIT_MAGIC)
1263 as_fatal (_("libbfd ABI mismatch"));
1264
1265 obstack_begin (&notes, chunksize);
1266 xatexit (free_notes);
1267
1268 myname = **argvp;
1269 xmalloc_set_program_name (myname);
1270 bfd_set_error_program_name (myname);
1271
1272 expandargv (argcp, argvp);
1273
1274 init_include_dir ();
1275
1276 #ifdef HOST_SPECIAL_INIT
1277 HOST_SPECIAL_INIT (*argcp, *argvp);
1278 #endif
1279
1280 #ifdef USE_EMULATIONS
1281 select_emulation_mode (*argcp, *argvp);
1282 #endif
1283 }
1284
1285 /* Tack on format specific section data and create a proper section
1286 symbol for one of the standard bfd sections. */
1287
1288 static void
1289 bfd_std_section_init (const char *name)
1290 {
1291 asection *sec = bfd_make_section_old_way (stdoutput, name);
1292 gas_assert (BFD_SEND (stdoutput, _new_section_hook, (stdoutput, sec)));
1293 subseg_new (name, 0);
1294 }
1295
1296 /* The bulk of gas initialisation. This is after args are parsed. */
1297
1298 static void
1299 gas_init (void)
1300 {
1301 symbol_begin ();
1302 frag_init ();
1303 subsegs_begin ();
1304 read_begin ();
1305 input_scrub_begin ();
1306 expr_begin ();
1307 eh_begin ();
1308
1309 macro_init ();
1310
1311 dwarf2_init ();
1312
1313 local_symbol_make (".gasversion.", absolute_section,
1314 &predefined_address_frag, BFD_VERSION / 10000UL);
1315
1316 /* Note: Put new initialisation calls that don't depend on stdoutput
1317 being open above this point. stdoutput must be open for anything
1318 that might use stdoutput objalloc memory, eg. calling bfd_alloc
1319 or creating global symbols (via bfd_make_empty_symbol). */
1320 xatexit (output_file_close);
1321 output_file_create (out_file_name);
1322 gas_assert (stdoutput != 0);
1323
1324 /* Must be called before output_file_close. xexit calls the xatexit
1325 list in reverse order. */
1326 if (flag_print_statistics)
1327 xatexit (dump_statistics);
1328
1329 dot_symbol_init ();
1330
1331 #ifdef tc_init_after_args
1332 tc_init_after_args ();
1333 #endif
1334
1335 itbl_init ();
1336
1337 /* Now that we have fully initialized, and have created the output
1338 file, define any symbols requested by --defsym command line
1339 arguments. */
1340 while (defsyms != NULL)
1341 {
1342 symbolS *sym;
1343 struct defsym_list *next;
1344
1345 sym = symbol_new (defsyms->name, absolute_section,
1346 &zero_address_frag, defsyms->value);
1347 /* Make symbols defined on the command line volatile, so that they
1348 can be redefined inside a source file. This makes this assembler's
1349 behaviour compatible with earlier versions, but it may not be
1350 completely intuitive. */
1351 S_SET_VOLATILE (sym);
1352 symbol_table_insert (sym);
1353 next = defsyms->next;
1354 free (defsyms);
1355 defsyms = next;
1356 }
1357
1358 #ifndef OBJ_MACH_O
1359 /* Create the standard sections, and those the assembler uses
1360 internally. */
1361 text_section = subseg_new (TEXT_SECTION_NAME, 0);
1362 data_section = subseg_new (DATA_SECTION_NAME, 0);
1363 bss_section = subseg_new (BSS_SECTION_NAME, 0);
1364 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1365 to have relocs, otherwise we don't find out in time. */
1366 flagword applicable = bfd_applicable_section_flags (stdoutput);
1367 bfd_set_section_flags (text_section,
1368 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1369 | SEC_CODE | SEC_READONLY));
1370 bfd_set_section_flags (data_section,
1371 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1372 | SEC_DATA));
1373 bfd_set_section_flags (bss_section, applicable & SEC_ALLOC);
1374 seg_info (bss_section)->bss = 1;
1375 #endif
1376 bfd_std_section_init (BFD_ABS_SECTION_NAME);
1377 bfd_std_section_init (BFD_UND_SECTION_NAME);
1378 reg_section = subseg_new ("*GAS `reg' section*", 0);
1379 expr_section = subseg_new ("*GAS `expr' section*", 0);
1380 }
1381
1382 int
1383 main (int argc, char ** argv)
1384 {
1385 char ** argv_orig = argv;
1386 struct stat sob;
1387
1388 gas_early_init (&argc, &argv);
1389
1390 /* Call parse_args before gas_init so that switches like
1391 --hash-size can be honored. */
1392 parse_args (&argc, &argv);
1393
1394 if (argc > 1 && stat (out_file_name, &sob) == 0)
1395 {
1396 int i;
1397
1398 for (i = 1; i < argc; ++i)
1399 {
1400 struct stat sib;
1401
1402 /* Check that the input file and output file are different. */
1403 if (stat (argv[i], &sib) == 0
1404 && sib.st_ino == sob.st_ino
1405 /* POSIX emulating systems may support stat() but if the
1406 underlying file system does not support a file serial number
1407 of some kind then they will return 0 for the inode. So
1408 two files with an inode of 0 may not actually be the same.
1409 On real POSIX systems no ordinary file will ever have an
1410 inode of 0. */
1411 && sib.st_ino != 0
1412 /* Different files may have the same inode number if they
1413 reside on different devices, so check the st_dev field as
1414 well. */
1415 && sib.st_dev == sob.st_dev
1416 /* PR 25572: Only check regular files. Devices, sockets and so
1417 on might actually work as both input and output. Plus there
1418 is a use case for using /dev/null as both input and output
1419 when checking for command line option support in a script:
1420 as --foo /dev/null -o /dev/null; if $? then ... */
1421 && S_ISREG (sib.st_mode))
1422 {
1423 const char *saved_out_file_name = out_file_name;
1424
1425 /* Don't let as_fatal remove the output file! */
1426 out_file_name = NULL;
1427 as_fatal (_("The input '%s' and output '%s' files are the same"),
1428 argv[i], saved_out_file_name);
1429 }
1430 }
1431 }
1432
1433 gas_init ();
1434
1435 /* Assemble it. */
1436 perform_an_assembly_pass (argc, argv);
1437
1438 cond_finish_check (-1);
1439
1440 #ifdef md_finish
1441 md_finish ();
1442 #endif
1443
1444 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
1445 if ((flag_execstack || flag_noexecstack)
1446 && OUTPUT_FLAVOR == bfd_target_elf_flavour)
1447 {
1448 segT gnustack;
1449
1450 gnustack = subseg_new (".note.GNU-stack", 0);
1451 bfd_set_section_flags (gnustack,
1452 SEC_READONLY | (flag_execstack ? SEC_CODE : 0));
1453
1454 }
1455 #endif
1456
1457 codeview_finish ();
1458
1459 /* If we've been collecting dwarf2 .debug_line info, either for
1460 assembly debugging or on behalf of the compiler, emit it now. */
1461 dwarf2_finish ();
1462
1463 /* If we constructed dwarf2 .eh_frame info, either via .cfi
1464 directives from the user or by the backend, emit it now. */
1465 cfi_finish ();
1466
1467 keep_it = 0;
1468 if (seen_at_least_1_file ())
1469 {
1470 int n_warns, n_errs;
1471 char warn_msg[50];
1472 char err_msg[50];
1473
1474 write_object_file ();
1475
1476 n_warns = had_warnings ();
1477 n_errs = had_errors ();
1478
1479 sprintf (warn_msg,
1480 ngettext ("%d warning", "%d warnings", n_warns), n_warns);
1481 sprintf (err_msg,
1482 ngettext ("%d error", "%d errors", n_errs), n_errs);
1483 if (flag_fatal_warnings && n_warns != 0)
1484 {
1485 if (n_errs == 0)
1486 as_bad (_("%s, treating warnings as errors"), warn_msg);
1487 n_errs += n_warns;
1488 }
1489
1490 if (n_errs == 0)
1491 keep_it = 1;
1492 else if (flag_always_generate_output)
1493 {
1494 /* The -Z flag indicates that an object file should be generated,
1495 regardless of warnings and errors. */
1496 keep_it = 1;
1497 fprintf (stderr, _("%s, %s, generating bad object file\n"),
1498 err_msg, warn_msg);
1499 }
1500 }
1501
1502 fflush (stderr);
1503
1504 #ifndef NO_LISTING
1505 listing_print (listing_filename, argv_orig);
1506 #endif
1507
1508 input_scrub_end ();
1509
1510 /* Use xexit instead of return, because under VMS environments they
1511 may not place the same interpretation on the value given. */
1512 if (had_errors () != 0)
1513 xexit (EXIT_FAILURE);
1514
1515 /* Only generate dependency file if assembler was successful. */
1516 print_dependencies ();
1517
1518 xexit (EXIT_SUCCESS);
1519 }