1 /* as.c - GAS main program.
2 Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GAS, the GNU Assembler.
8 GAS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GAS is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
23 /* Main program for AS; a 32-bit assembler of GNU.
24 Understands command arguments.
25 Has a few routines that don't fit in other modules because they
31 Since no-one else says they will support them in future: I
32 don't support them now. */
38 #include "output-file.h"
41 #include "dwarf2dbg.h"
42 #include "dw2gencfi.h"
52 #ifdef NEED_DECLARATION_SBRK
58 /* Perform any cgen specific initialisation for gas. */
59 extern void gas_cgen_begin (void);
62 /* We build a list of defsyms as we read the options, and then define
63 them after we have initialized everything. */
66 struct defsym_list *next;
72 /* True if a listing is wanted. */
75 /* Type of debugging to generate. */
76 enum debug_info_type debug_type = DEBUG_UNSPECIFIED;
77 int use_gnu_debug_info_extensions = 0;
79 #ifndef MD_DEBUG_FORMAT_SELECTOR
80 #define MD_DEBUG_FORMAT_SELECTOR NULL
82 static enum debug_info_type (*md_debug_format_selector) (int *) = MD_DEBUG_FORMAT_SELECTOR;
84 /* Maximum level of macro nesting. */
85 int max_macro_nest = 100;
90 /* The default obstack chunk size. If we set this to zero, the
91 obstack code will use whatever will fit in a 4096 byte block. */
94 /* To monitor memory allocation more effectively, make this non-zero.
95 Then the chunk sizes for gas and bfd will be reduced. */
98 /* Enable verbose mode. */
101 /* Keep the output file. */
110 /* Name of listing file. */
111 static char *listing_filename = NULL;
113 static struct defsym_list *defsyms;
116 /* Keep a record of the itbl files we read in. */
117 struct itbl_file_list
119 struct itbl_file_list *next;
122 static struct itbl_file_list *itbl_files;
125 static long start_time;
127 static int flag_macro_alternate;
130 #ifdef USE_EMULATIONS
131 #define EMULATION_ENVIRON "AS_EMULATION"
133 extern struct emulation mipsbelf, mipslelf, mipself;
134 extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
135 extern struct emulation i386coff, i386elf, i386aout;
136 extern struct emulation crisaout, criself;
138 static struct emulation *const emulations[] = { EMULATIONS };
139 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
142 select_emulation_mode (int argc, char **argv)
147 for (i = 1; i < argc; i++)
148 if (!strncmp ("--em", argv[i], 4))
154 p = strchr (argv[i], '=');
161 as_fatal (_("missing emulation mode name"));
166 em = getenv (EMULATION_ENVIRON);
168 em = DEFAULT_EMULATION;
172 for (i = 0; i < n_emulations; i++)
173 if (!strcmp (emulations[i]->name, em))
175 if (i == n_emulations)
176 as_fatal (_("unrecognized emulation name `%s'"), em);
177 this_emulation = emulations[i];
180 this_emulation = emulations[0];
182 this_emulation->init ();
186 default_emul_bfd_name (void)
193 common_emul_init (void)
195 this_format = this_emulation->format;
197 if (this_emulation->leading_underscore == 2)
198 this_emulation->leading_underscore = this_format->dfl_leading_underscore;
200 if (this_emulation->default_endian != 2)
201 target_big_endian = this_emulation->default_endian;
203 if (this_emulation->fake_label_name == 0)
205 if (this_emulation->leading_underscore)
206 this_emulation->fake_label_name = "L0\001";
208 /* What other parameters should we test? */
209 this_emulation->fake_label_name = ".L0\001";
215 print_version_id (void)
223 fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s\n"),
224 VERSION, TARGET_ALIAS, BFD_VERSION_STRING);
228 show_usage (FILE * stream)
230 fprintf (stream, _("Usage: %s [option...] [asmfile...]\n"), myname);
232 fprintf (stream, _("\
234 -a[sub-option...] turn on listings\n\
235 Sub-options [default hls]:\n\
236 c omit false conditionals\n\
237 d omit debugging directives\n\
238 g include general info\n\
239 h include high-level source\n\
240 l include assembly\n\
241 m include macro expansions\n\
242 n omit forms processing\n\
244 =FILE list to FILE (must be last sub-option)\n"));
246 fprintf (stream, _("\
247 --alternate initially turn on alternate macro syntax\n"));
248 fprintf (stream, _("\
249 -D produce assembler debugging messages\n"));
250 fprintf (stream, _("\
251 --debug-prefix-map OLD=NEW Map OLD to NEW in debug information\n"));
252 fprintf (stream, _("\
253 --defsym SYM=VAL define symbol SYM to given value\n"));
254 #ifdef USE_EMULATIONS
261 for (i = 0; i < n_emulations - 1; i++)
262 fprintf (stream, "%s | ", emulations[i]->name);
263 fprintf (stream, "%s]\n", emulations[i]->name);
265 def_em = getenv (EMULATION_ENVIRON);
267 def_em = DEFAULT_EMULATION;
268 fprintf (stream, _("\
269 emulate output (default %s)\n"), def_em);
272 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
273 fprintf (stream, _("\
274 --execstack require executable stack for this object\n"));
275 fprintf (stream, _("\
276 --noexecstack don't require executable stack for this object\n"));
278 fprintf (stream, _("\
279 -f skip whitespace and comment preprocessing\n"));
280 fprintf (stream, _("\
281 -g --gen-debug generate debugging information\n"));
282 fprintf (stream, _("\
283 --gstabs generate STABS debugging information\n"));
284 fprintf (stream, _("\
285 --gstabs+ generate STABS debug info with GNU extensions\n"));
286 fprintf (stream, _("\
287 --gdwarf-2 generate DWARF2 debugging information\n"));
288 fprintf (stream, _("\
289 --hash-size=<value> set the hash table size close to <value>\n"));
290 fprintf (stream, _("\
291 --help show this message and exit\n"));
292 fprintf (stream, _("\
293 --target-help show target specific options\n"));
294 fprintf (stream, _("\
295 -I DIR add DIR to search list for .include directives\n"));
296 fprintf (stream, _("\
297 -J don't warn about signed overflow\n"));
298 fprintf (stream, _("\
299 -K warn when differences altered for long displacements\n"));
300 fprintf (stream, _("\
301 -L,--keep-locals keep local symbols (e.g. starting with `L')\n"));
302 fprintf (stream, _("\
303 -M,--mri assemble in MRI compatibility mode\n"));
304 fprintf (stream, _("\
305 --MD FILE write dependency information in FILE (default none)\n"));
306 fprintf (stream, _("\
308 fprintf (stream, _("\
309 -o OBJFILE name the object-file output OBJFILE (default a.out)\n"));
310 fprintf (stream, _("\
311 -R fold data section into text section\n"));
312 fprintf (stream, _("\
313 --reduce-memory-overheads \n\
314 prefer smaller memory use at the cost of longer\n\
316 fprintf (stream, _("\
317 --statistics print various measured statistics from execution\n"));
318 fprintf (stream, _("\
319 --strip-local-absolute strip local absolute symbols\n"));
320 fprintf (stream, _("\
321 --traditional-format Use same format as native assembler when possible\n"));
322 fprintf (stream, _("\
323 --version print assembler version number and exit\n"));
324 fprintf (stream, _("\
325 -W --no-warn suppress warnings\n"));
326 fprintf (stream, _("\
327 --warn don't suppress warnings\n"));
328 fprintf (stream, _("\
329 --fatal-warnings treat warnings as errors\n"));
331 fprintf (stream, _("\
332 --itbl INSTTBL extend instruction set to include instructions\n\
333 matching the specifications defined in file INSTTBL\n"));
335 fprintf (stream, _("\
337 fprintf (stream, _("\
339 fprintf (stream, _("\
340 -Z generate object file even after errors\n"));
341 fprintf (stream, _("\
342 --listing-lhs-width set the width in words of the output data column of\n\
344 fprintf (stream, _("\
345 --listing-lhs-width2 set the width in words of the continuation lines\n\
346 of the output data column; ignored if smaller than\n\
347 the width of the first line\n"));
348 fprintf (stream, _("\
349 --listing-rhs-width set the max width in characters of the lines from\n\
350 the source file\n"));
351 fprintf (stream, _("\
352 --listing-cont-lines set the maximum number of continuation lines used\n\
353 for the output data column of the listing\n"));
354 fprintf (stream, _("\
355 @FILE read options from FILE\n"));
357 md_show_usage (stream);
359 fputc ('\n', stream);
361 if (REPORT_BUGS_TO[0] && stream == stdout)
362 fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
365 /* Since it is easy to do here we interpret the special arg "-"
366 to mean "use stdin" and we set that argv[] pointing to "".
367 After we have munged argv[], the only things left are source file
368 name(s) and ""(s) denoting stdin. These file names are used
369 (perhaps more than once) later.
371 check for new machine-dep cmdline options in
372 md_parse_option definitions in config/tc-*.c. */
375 parse_args (int * pargc, char *** pargv)
381 /* Starting the short option string with '-' is for programs that
382 expect options and other ARGV-elements in any order and that care about
383 the ordering of the two. We describe each non-option ARGV-element
384 as if it were the argument of an option with character code 1. */
386 extern const char *md_shortopts;
387 static const char std_shortopts[] =
390 #ifndef WORKING_DOT_WORD
391 /* -K is not meaningful if .word is not being hacked. */
394 'L', 'M', 'R', 'W', 'Z', 'a', ':', ':', 'D', 'f', 'g', ':',':', 'I', ':', 'o', ':',
396 /* -v takes an argument on VMS, so we don't make it a generic
402 /* New option for extending instruction set (see also --itbl below). */
407 struct option *longopts;
408 extern struct option md_longopts[];
409 extern size_t md_longopts_size;
410 /* Codes used for the long options with no short synonyms. */
413 OPTION_HELP = OPTION_STD_BASE,
420 OPTION_DEBUG_PREFIX_MAP,
422 OPTION_LISTING_LHS_WIDTH,
423 OPTION_LISTING_LHS_WIDTH2,
424 OPTION_LISTING_RHS_WIDTH,
425 OPTION_LISTING_CONT_LINES,
430 OPTION_STRIP_LOCAL_ABSOLUTE,
431 OPTION_TRADITIONAL_FORMAT,
438 OPTION_HASH_TABLE_SIZE,
439 OPTION_REDUCE_MEMORY_OVERHEADS,
441 OPTION_COMPRESS_DEBUG,
442 OPTION_NOCOMPRESS_DEBUG
443 /* When you add options here, check that they do
444 not collide with OPTION_MD_BASE. See as.h. */
447 static const struct option std_longopts[] =
449 /* Note: commas are placed at the start of the line rather than
450 the end of the preceeding line so that it is simpler to
451 selectively add and remove lines from this list. */
452 {"alternate", no_argument, NULL, OPTION_ALTERNATE}
453 /* The entry for "a" is here to prevent getopt_long_only() from
454 considering that -a is an abbreviation for --alternate. This is
455 necessary because -a=<FILE> is a valid switch but getopt would
456 normally reject it since --alternate does not take an argument. */
457 ,{"a", optional_argument, NULL, 'a'}
458 /* Handle -al=<FILE>. */
459 ,{"al", optional_argument, NULL, OPTION_AL}
460 ,{"compress-debug-sections", no_argument, NULL, OPTION_COMPRESS_DEBUG}
461 ,{"nocompress-debug-sections", no_argument, NULL, OPTION_NOCOMPRESS_DEBUG}
462 ,{"debug-prefix-map", required_argument, NULL, OPTION_DEBUG_PREFIX_MAP}
463 ,{"defsym", required_argument, NULL, OPTION_DEFSYM}
464 ,{"dump-config", no_argument, NULL, OPTION_DUMPCONFIG}
465 ,{"emulation", required_argument, NULL, OPTION_EMULATION}
466 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
467 ,{"execstack", no_argument, NULL, OPTION_EXECSTACK}
468 ,{"noexecstack", no_argument, NULL, OPTION_NOEXECSTACK}
470 ,{"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
471 ,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF2}
472 /* GCC uses --gdwarf-2 but GAS uses to use --gdwarf2,
473 so we keep it here for backwards compatibility. */
474 ,{"gdwarf2", no_argument, NULL, OPTION_GDWARF2}
475 ,{"gen-debug", no_argument, NULL, 'g'}
476 ,{"gstabs", no_argument, NULL, OPTION_GSTABS}
477 ,{"gstabs+", no_argument, NULL, OPTION_GSTABS_PLUS}
478 ,{"hash-size", required_argument, NULL, OPTION_HASH_TABLE_SIZE}
479 ,{"help", no_argument, NULL, OPTION_HELP}
481 /* New option for extending instruction set (see also -t above).
482 The "-t file" or "--itbl file" option extends the basic set of
483 valid instructions by reading "file", a text file containing a
484 list of instruction formats. The additional opcodes and their
485 formats are added to the built-in set of instructions, and
486 mnemonics for new registers may also be defined. */
487 ,{"itbl", required_argument, NULL, 't'}
489 /* getopt allows abbreviations, so we do this to stop it from
490 treating -k as an abbreviation for --keep-locals. Some
491 ports use -k to enable PIC assembly. */
492 ,{"keep-locals", no_argument, NULL, 'L'}
493 ,{"keep-locals", no_argument, NULL, 'L'}
494 ,{"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH}
495 ,{"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2}
496 ,{"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH}
497 ,{"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES}
498 ,{"MD", required_argument, NULL, OPTION_DEPFILE}
499 ,{"mri", no_argument, NULL, 'M'}
500 ,{"nocpp", no_argument, NULL, OPTION_NOCPP}
501 ,{"no-warn", no_argument, NULL, 'W'}
502 ,{"reduce-memory-overheads", no_argument, NULL, OPTION_REDUCE_MEMORY_OVERHEADS}
503 ,{"statistics", no_argument, NULL, OPTION_STATISTICS}
504 ,{"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE}
505 ,{"version", no_argument, NULL, OPTION_VERSION}
506 ,{"verbose", no_argument, NULL, OPTION_VERBOSE}
507 ,{"target-help", no_argument, NULL, OPTION_TARGET_HELP}
508 ,{"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT}
509 ,{"warn", no_argument, NULL, OPTION_WARN}
512 /* Construct the option lists from the standard list and the target
513 dependent list. Include space for an extra NULL option and
514 always NULL terminate. */
515 shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
516 longopts = (struct option *) xmalloc (sizeof (std_longopts)
517 + md_longopts_size + sizeof (struct option));
518 memcpy (longopts, std_longopts, sizeof (std_longopts));
519 memcpy (((char *) longopts) + sizeof (std_longopts), md_longopts, md_longopts_size);
520 memset (((char *) longopts) + sizeof (std_longopts) + md_longopts_size,
521 0, sizeof (struct option));
523 /* Make a local copy of the old argv. */
527 /* Initialize a new argv that contains no options. */
528 new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
529 new_argv[0] = old_argv[0];
531 new_argv[new_argc] = NULL;
535 /* getopt_long_only is like getopt_long, but '-' as well as '--' can
536 indicate a long option. */
538 int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
547 /* md_parse_option should return 1 if it recognizes optc,
549 if (md_parse_option (optc, optarg) != 0)
551 /* `-v' isn't included in the general short_opts list, so check for
552 it explicitly here before deciding we've gotten a bad argument. */
556 /* Telling getopt to treat -v's value as optional can result
557 in it picking up a following filename argument here. The
558 VMS code in md_parse_option can return 0 in that case,
559 but it has no way of pushing the filename argument back. */
560 if (optarg && *optarg)
561 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
572 as_bad (_("unrecognized option -%c%s"), optc, optarg ? optarg : "");
578 case 1: /* File name. */
579 if (!strcmp (optarg, "-"))
581 new_argv[new_argc++] = optarg;
582 new_argv[new_argc] = NULL;
585 case OPTION_TARGET_HELP:
586 md_show_usage (stdout);
596 case OPTION_STATISTICS:
597 flag_print_statistics = 1;
600 case OPTION_STRIP_LOCAL_ABSOLUTE:
601 flag_strip_local_absolute = 1;
604 case OPTION_TRADITIONAL_FORMAT:
605 flag_traditional_format = 1;
609 /* This output is intended to follow the GNU standards document. */
610 printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
611 printf (_("Copyright 2010 Free Software Foundation, Inc.\n"));
613 This program is free software; you may redistribute it under the terms of\n\
614 the GNU General Public License version 3 or later.\n\
615 This program has absolutely no warranty.\n"));
616 printf (_("This assembler was configured for a target of `%s'.\n"),
620 case OPTION_EMULATION:
621 #ifdef USE_EMULATIONS
622 if (strcmp (optarg, this_emulation->name))
623 as_fatal (_("multiple emulation names specified"));
625 as_fatal (_("emulations not handled in this configuration"));
629 case OPTION_DUMPCONFIG:
630 fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
631 fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
632 fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
633 #ifdef TARGET_OBJ_FORMAT
634 fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
637 fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
641 case OPTION_COMPRESS_DEBUG:
642 flag_compress_debug = 1;
645 case OPTION_NOCOMPRESS_DEBUG:
646 flag_compress_debug = 0;
649 case OPTION_DEBUG_PREFIX_MAP:
650 add_debug_prefix_map (optarg);
657 struct defsym_list *n;
659 for (s = optarg; *s != '\0' && *s != '='; s++)
662 as_fatal (_("bad defsym; format is --defsym name=value"));
664 i = bfd_scan_vma (s, (const char **) NULL, 0);
665 n = (struct defsym_list *) xmalloc (sizeof *n);
676 /* optarg is the name of the file containing the instruction
677 formats, opcodes, register names, etc. */
678 struct itbl_file_list *n;
682 as_warn (_("no file name following -t option"));
686 n = xmalloc (sizeof * n);
687 n->next = itbl_files;
691 /* Parse the file and add the new instructions to our internal
692 table. If multiple instruction tables are specified, the
693 information from this table gets appended onto the existing
695 itbl_files->name = xstrdup (optarg);
696 if (itbl_parse (itbl_files->name) != 0)
697 as_fatal (_("failed to read instruction table %s\n"),
704 start_dependencies (optarg);
708 /* Some backends, eg Alpha and Mips, use the -g switch for their
709 own purposes. So we check here for an explicit -g and allow
710 the backend to decide if it wants to process it. */
711 if ( old_argv[optind - 1][1] == 'g'
712 && md_parse_option (optc, optarg))
715 if (md_debug_format_selector)
716 debug_type = md_debug_format_selector (& use_gnu_debug_info_extensions);
718 debug_type = DEBUG_DWARF2;
720 debug_type = DEBUG_STABS;
723 case OPTION_GSTABS_PLUS:
724 use_gnu_debug_info_extensions = 1;
727 debug_type = DEBUG_STABS;
731 debug_type = DEBUG_DWARF2;
735 flag_signed_overflow_ok = 1;
738 #ifndef WORKING_DOT_WORD
740 flag_warn_displacement = 1;
744 flag_keep_locals = 1;
747 case OPTION_LISTING_LHS_WIDTH:
748 listing_lhs_width = atoi (optarg);
749 if (listing_lhs_width_second < listing_lhs_width)
750 listing_lhs_width_second = listing_lhs_width;
752 case OPTION_LISTING_LHS_WIDTH2:
754 int tmp = atoi (optarg);
756 if (tmp > listing_lhs_width)
757 listing_lhs_width_second = tmp;
760 case OPTION_LISTING_RHS_WIDTH:
761 listing_rhs_width = atoi (optarg);
763 case OPTION_LISTING_CONT_LINES:
764 listing_lhs_cont_lines = atoi (optarg);
775 flag_readonly_data_in_text = 1;
779 flag_no_warnings = 1;
783 flag_no_warnings = 0;
784 flag_fatal_warnings = 0;
787 case OPTION_WARN_FATAL:
788 flag_no_warnings = 0;
789 flag_fatal_warnings = 1;
792 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
793 case OPTION_EXECSTACK:
795 flag_noexecstack = 0;
798 case OPTION_NOEXECSTACK:
799 flag_noexecstack = 1;
804 flag_always_generate_output = 1;
808 listing |= LISTING_LISTING;
810 listing_filename = xstrdup (optarg);
813 case OPTION_ALTERNATE:
814 optarg = old_argv [optind - 1];
815 while (* optarg == '-')
818 if (strcmp (optarg, "alternate") == 0)
820 flag_macro_alternate = 1;
829 if (optarg != old_argv[optind] && optarg[-1] == '=')
832 if (md_parse_option (optc, optarg) != 0)
840 listing |= LISTING_NOCOND;
843 listing |= LISTING_NODEBUG;
846 listing |= LISTING_GENERAL;
849 listing |= LISTING_HLL;
852 listing |= LISTING_LISTING;
855 listing |= LISTING_MACEXP;
858 listing |= LISTING_NOFORM;
861 listing |= LISTING_SYMBOLS;
864 listing_filename = xstrdup (optarg + 1);
865 optarg += strlen (listing_filename);
868 as_fatal (_("invalid listing option `%c'"), *optarg);
875 listing = LISTING_DEFAULT;
879 /* DEBUG is implemented: it debugs different
880 things from other people's assemblers. */
885 flag_no_comments = 1;
889 { /* Include file directory. */
890 char *temp = xstrdup (optarg);
892 add_include_dir (temp);
897 out_file_name = xstrdup (optarg);
904 /* -X means treat warnings as errors. */
907 case OPTION_REDUCE_MEMORY_OVERHEADS:
908 /* The only change we make at the moment is to reduce
909 the size of the hash tables that we use. */
910 set_gas_hash_table_size (4051);
913 case OPTION_HASH_TABLE_SIZE:
915 unsigned long new_size;
917 new_size = strtoul (optarg, NULL, 0);
919 set_gas_hash_table_size (new_size);
921 as_fatal (_("--hash-size needs a numeric argument"));
933 #ifdef md_after_parse_args
934 md_after_parse_args ();
939 dump_statistics (void)
942 char *lim = (char *) sbrk (0);
944 long run_time = get_run_time () - start_time;
946 fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
947 myname, run_time / 1000000, run_time % 1000000);
949 fprintf (stderr, _("%s: data size %ld\n"),
950 myname, (long) (lim - (char *) &environ));
953 subsegs_print_statistics (stderr);
954 write_print_statistics (stderr);
955 symbol_print_statistics (stderr);
956 read_print_statistics (stderr);
958 #ifdef tc_print_statistics
959 tc_print_statistics (stderr);
962 #ifdef obj_print_statistics
963 obj_print_statistics (stderr);
968 close_output_file (void)
970 output_file_close (out_file_name);
972 unlink_if_ordinary (out_file_name);
975 /* The interface between the macro code and gas expression handling. */
978 macro_expr (const char *emsg, int idx, sb *in, int *val)
985 hold = input_line_pointer;
986 input_line_pointer = in->ptr + idx;
987 expression_and_evaluate (&ex);
988 idx = input_line_pointer - in->ptr;
989 input_line_pointer = hold;
991 if (ex.X_op != O_constant)
994 *val = (int) ex.X_add_number;
999 /* Here to attempt 1 pass over each input file.
1000 We scan argv[*] looking for filenames or exactly "" which is
1001 shorthand for stdin. Any argv that is NULL is not a file-name.
1002 We set need_pass_2 TRUE if, after this, we still have unresolved
1003 expressions of the form (unknown value)+-(unknown value).
1005 Note the un*x semantics: there is only 1 logical input file, but it
1006 may be a catenation of many 'physical' input files. */
1009 perform_an_assembly_pass (int argc, char ** argv)
1012 flagword applicable;
1016 /* Create the standard sections, and those the assembler uses
1018 text_section = subseg_new (TEXT_SECTION_NAME, 0);
1019 data_section = subseg_new (DATA_SECTION_NAME, 0);
1020 bss_section = subseg_new (BSS_SECTION_NAME, 0);
1021 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1022 to have relocs, otherwise we don't find out in time. */
1023 applicable = bfd_applicable_section_flags (stdoutput);
1024 bfd_set_section_flags (stdoutput, text_section,
1025 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1026 | SEC_CODE | SEC_READONLY));
1027 bfd_set_section_flags (stdoutput, data_section,
1028 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1030 bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1031 seg_info (bss_section)->bss = 1;
1032 subseg_new (BFD_ABS_SECTION_NAME, 0);
1033 subseg_new (BFD_UND_SECTION_NAME, 0);
1034 reg_section = subseg_new ("*GAS `reg' section*", 0);
1035 expr_section = subseg_new ("*GAS `expr' section*", 0);
1037 subseg_set (text_section, 0);
1039 /* This may add symbol table entries, which requires having an open BFD,
1040 and sections already created. */
1057 { /* Is it a file-name argument? */
1060 /* argv->"" if stdin desired, else->filename. */
1061 read_a_source_file (*argv);
1063 argv++; /* Completed that argv. */
1066 read_a_source_file ("");
1071 create_obj_attrs_section (void)
1078 size = bfd_elf_obj_attr_size (stdoutput);
1081 name = get_elf_backend_data (stdoutput)->obj_attrs_section;
1083 name = ".gnu.attributes";
1084 s = subseg_new (name, 0);
1085 elf_section_type (s)
1086 = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
1087 bfd_set_section_flags (stdoutput, s, SEC_READONLY | SEC_DATA);
1089 p = frag_more (size);
1090 bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
1097 main (int argc, char ** argv)
1099 char ** argv_orig = argv;
1103 start_time = get_run_time ();
1105 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
1106 setlocale (LC_MESSAGES, "");
1108 #if defined (HAVE_SETLOCALE)
1109 setlocale (LC_CTYPE, "");
1111 bindtextdomain (PACKAGE, LOCALEDIR);
1112 textdomain (PACKAGE);
1117 #ifdef HOST_SPECIAL_INIT
1118 HOST_SPECIAL_INIT (argc, argv);
1122 xmalloc_set_program_name (myname);
1124 expandargv (&argc, &argv);
1126 START_PROGRESS (myname, 0);
1128 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
1129 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
1132 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
1136 bfd_set_error_program_name (myname);
1138 #ifdef USE_EMULATIONS
1139 select_emulation_mode (argc, argv);
1143 /* Call parse_args before any of the init/begin functions
1144 so that switches like --hash-size can be honored. */
1145 parse_args (&argc, &argv);
1150 input_scrub_begin ();
1153 /* It has to be called after dump_statistics (). */
1154 xatexit (close_output_file);
1156 if (flag_print_statistics)
1157 xatexit (dump_statistics);
1161 macro_strip_at = flag_mri;
1164 macro_init (flag_macro_alternate, flag_mri, macro_strip_at, macro_expr);
1168 output_file_create (out_file_name);
1169 gas_assert (stdoutput != 0);
1171 #ifdef tc_init_after_args
1172 tc_init_after_args ();
1179 /* Now that we have fully initialized, and have created the output
1180 file, define any symbols requested by --defsym command line
1182 while (defsyms != NULL)
1185 struct defsym_list *next;
1187 sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
1188 &zero_address_frag);
1189 /* Make symbols defined on the command line volatile, so that they
1190 can be redefined inside a source file. This makes this assembler's
1191 behaviour compatible with earlier versions, but it may not be
1192 completely intuitive. */
1193 S_SET_VOLATILE (sym);
1194 symbol_table_insert (sym);
1195 next = defsyms->next;
1203 perform_an_assembly_pass (argc, argv);
1205 cond_finish_check (-1);
1213 create_obj_attrs_section ();
1216 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
1217 if ((flag_execstack || flag_noexecstack)
1218 && OUTPUT_FLAVOR == bfd_target_elf_flavour)
1222 gnustack = subseg_new (".note.GNU-stack", 0);
1223 bfd_set_section_flags (stdoutput, gnustack,
1224 SEC_READONLY | (flag_execstack ? SEC_CODE : 0));
1229 /* If we've been collecting dwarf2 .debug_line info, either for
1230 assembly debugging or on behalf of the compiler, emit it now. */
1233 /* If we constructed dwarf2 .eh_frame info, either via .cfi
1234 directives from the user or by the backend, emit it now. */
1237 if (seen_at_least_1_file ()
1238 && (flag_always_generate_output || had_errors () == 0))
1243 /* This used to be done at the start of write_object_file in
1244 write.c, but that caused problems when doing listings when
1245 keep_it was zero. This could probably be moved above md_end, but
1246 I didn't want to risk the change. */
1250 write_object_file ();
1255 listing_print (listing_filename, argv_orig);
1258 if (flag_fatal_warnings && had_warnings () > 0 && had_errors () == 0)
1259 as_bad (_("%d warnings, treating warnings as errors"), had_warnings ());
1261 if (had_errors () > 0 && ! flag_always_generate_output)
1266 END_PROGRESS (myname);
1268 /* Use xexit instead of return, because under VMS environments they
1269 may not place the same interpretation on the value given. */
1270 if (had_errors () > 0)
1271 xexit (EXIT_FAILURE);
1273 /* Only generate dependency file if assembler was successful. */
1274 print_dependencies ();
1276 xexit (EXIT_SUCCESS);