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
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. */
107 /* Name of listing file. */
108 static char *listing_filename = NULL;
110 static struct defsym_list *defsyms;
113 /* Keep a record of the itbl files we read in. */
114 struct itbl_file_list
116 struct itbl_file_list *next;
119 static struct itbl_file_list *itbl_files;
122 static long start_time;
124 static int flag_macro_alternate;
127 #ifdef USE_EMULATIONS
128 #define EMULATION_ENVIRON "AS_EMULATION"
130 extern struct emulation mipsbelf, mipslelf, mipself;
131 extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
132 extern struct emulation i386coff, i386elf, i386aout;
133 extern struct emulation crisaout, criself;
135 static struct emulation *const emulations[] = { EMULATIONS };
136 static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
139 select_emulation_mode (int argc, char **argv)
144 for (i = 1; i < argc; i++)
145 if (!strncmp ("--em", argv[i], 4))
151 p = strchr (argv[i], '=');
158 as_fatal (_("missing emulation mode name"));
163 em = getenv (EMULATION_ENVIRON);
165 em = DEFAULT_EMULATION;
169 for (i = 0; i < n_emulations; i++)
170 if (!strcmp (emulations[i]->name, em))
172 if (i == n_emulations)
173 as_fatal (_("unrecognized emulation name `%s'"), em);
174 this_emulation = emulations[i];
177 this_emulation = emulations[0];
179 this_emulation->init ();
183 default_emul_bfd_name (void)
190 common_emul_init (void)
192 this_format = this_emulation->format;
194 if (this_emulation->leading_underscore == 2)
195 this_emulation->leading_underscore = this_format->dfl_leading_underscore;
197 if (this_emulation->default_endian != 2)
198 target_big_endian = this_emulation->default_endian;
200 if (this_emulation->fake_label_name == 0)
202 if (this_emulation->leading_underscore)
203 this_emulation->fake_label_name = "L0\001";
205 /* What other parameters should we test? */
206 this_emulation->fake_label_name = ".L0\001";
212 print_version_id (void)
220 fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s\n"),
221 VERSION, TARGET_ALIAS, BFD_VERSION_STRING);
225 show_usage (FILE * stream)
227 fprintf (stream, _("Usage: %s [option...] [asmfile...]\n"), myname);
229 fprintf (stream, _("\
231 -a[sub-option...] turn on listings\n\
232 Sub-options [default hls]:\n\
233 c omit false conditionals\n\
234 d omit debugging directives\n\
235 g include general info\n\
236 h include high-level source\n\
237 l include assembly\n\
238 m include macro expansions\n\
239 n omit forms processing\n\
241 =FILE list to FILE (must be last sub-option)\n"));
243 fprintf (stream, _("\
244 --alternate initially turn on alternate macro syntax\n"));
245 fprintf (stream, _("\
246 -D produce assembler debugging messages\n"));
247 fprintf (stream, _("\
248 --debug-prefix-map OLD=NEW Map OLD to NEW in debug information\n"));
249 fprintf (stream, _("\
250 --defsym SYM=VAL define symbol SYM to given value\n"));
251 #ifdef USE_EMULATIONS
258 for (i = 0; i < n_emulations - 1; i++)
259 fprintf (stream, "%s | ", emulations[i]->name);
260 fprintf (stream, "%s]\n", emulations[i]->name);
262 def_em = getenv (EMULATION_ENVIRON);
264 def_em = DEFAULT_EMULATION;
265 fprintf (stream, _("\
266 emulate output (default %s)\n"), def_em);
269 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
270 fprintf (stream, _("\
271 --execstack require executable stack for this object\n"));
272 fprintf (stream, _("\
273 --noexecstack don't require executable stack for this object\n"));
275 fprintf (stream, _("\
276 -f skip whitespace and comment preprocessing\n"));
277 fprintf (stream, _("\
278 -g --gen-debug generate debugging information\n"));
279 fprintf (stream, _("\
280 --gstabs generate STABS debugging information\n"));
281 fprintf (stream, _("\
282 --gstabs+ generate STABS debug info with GNU extensions\n"));
283 fprintf (stream, _("\
284 --gdwarf-2 generate DWARF2 debugging information\n"));
285 fprintf (stream, _("\
286 --hash-size=<value> set the hash table size close to <value>\n"));
287 fprintf (stream, _("\
288 --help show this message and exit\n"));
289 fprintf (stream, _("\
290 --target-help show target specific options\n"));
291 fprintf (stream, _("\
292 -I DIR add DIR to search list for .include directives\n"));
293 fprintf (stream, _("\
294 -J don't warn about signed overflow\n"));
295 fprintf (stream, _("\
296 -K warn when differences altered for long displacements\n"));
297 fprintf (stream, _("\
298 -L,--keep-locals keep local symbols (e.g. starting with `L')\n"));
299 fprintf (stream, _("\
300 -M,--mri assemble in MRI compatibility mode\n"));
301 fprintf (stream, _("\
302 --MD FILE write dependency information in FILE (default none)\n"));
303 fprintf (stream, _("\
305 fprintf (stream, _("\
306 -o OBJFILE name the object-file output OBJFILE (default a.out)\n"));
307 fprintf (stream, _("\
308 -R fold data section into text section\n"));
309 fprintf (stream, _("\
310 --reduce-memory-overheads \n\
311 prefer smaller memory use at the cost of longer\n\
313 fprintf (stream, _("\
314 --statistics print various measured statistics from execution\n"));
315 fprintf (stream, _("\
316 --strip-local-absolute strip local absolute symbols\n"));
317 fprintf (stream, _("\
318 --traditional-format Use same format as native assembler when possible\n"));
319 fprintf (stream, _("\
320 --version print assembler version number and exit\n"));
321 fprintf (stream, _("\
322 -W --no-warn suppress warnings\n"));
323 fprintf (stream, _("\
324 --warn don't suppress warnings\n"));
325 fprintf (stream, _("\
326 --fatal-warnings treat warnings as errors\n"));
328 fprintf (stream, _("\
329 --itbl INSTTBL extend instruction set to include instructions\n\
330 matching the specifications defined in file INSTTBL\n"));
332 fprintf (stream, _("\
334 fprintf (stream, _("\
336 fprintf (stream, _("\
337 -Z generate object file even after errors\n"));
338 fprintf (stream, _("\
339 --listing-lhs-width set the width in words of the output data column of\n\
341 fprintf (stream, _("\
342 --listing-lhs-width2 set the width in words of the continuation lines\n\
343 of the output data column; ignored if smaller than\n\
344 the width of the first line\n"));
345 fprintf (stream, _("\
346 --listing-rhs-width set the max width in characters of the lines from\n\
347 the source file\n"));
348 fprintf (stream, _("\
349 --listing-cont-lines set the maximum number of continuation lines used\n\
350 for the output data column of the listing\n"));
351 fprintf (stream, _("\
352 @FILE read options from FILE\n"));
354 md_show_usage (stream);
356 fputc ('\n', stream);
358 if (REPORT_BUGS_TO[0] && stream == stdout)
359 fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
362 /* Since it is easy to do here we interpret the special arg "-"
363 to mean "use stdin" and we set that argv[] pointing to "".
364 After we have munged argv[], the only things left are source file
365 name(s) and ""(s) denoting stdin. These file names are used
366 (perhaps more than once) later.
368 check for new machine-dep cmdline options in
369 md_parse_option definitions in config/tc-*.c. */
372 parse_args (int * pargc, char *** pargv)
378 /* Starting the short option string with '-' is for programs that
379 expect options and other ARGV-elements in any order and that care about
380 the ordering of the two. We describe each non-option ARGV-element
381 as if it were the argument of an option with character code 1. */
383 extern const char *md_shortopts;
384 static const char std_shortopts[] =
387 #ifndef WORKING_DOT_WORD
388 /* -K is not meaningful if .word is not being hacked. */
391 'L', 'M', 'R', 'W', 'Z', 'a', ':', ':', 'D', 'f', 'g', ':',':', 'I', ':', 'o', ':',
393 /* -v takes an argument on VMS, so we don't make it a generic
399 /* New option for extending instruction set (see also --itbl below). */
404 struct option *longopts;
405 extern struct option md_longopts[];
406 extern size_t md_longopts_size;
407 /* Codes used for the long options with no short synonyms. */
410 OPTION_HELP = OPTION_STD_BASE,
417 OPTION_DEBUG_PREFIX_MAP,
419 OPTION_LISTING_LHS_WIDTH,
420 OPTION_LISTING_LHS_WIDTH2,
421 OPTION_LISTING_RHS_WIDTH,
422 OPTION_LISTING_CONT_LINES,
427 OPTION_STRIP_LOCAL_ABSOLUTE,
428 OPTION_TRADITIONAL_FORMAT,
435 OPTION_HASH_TABLE_SIZE,
436 OPTION_REDUCE_MEMORY_OVERHEADS,
438 /* When you add options here, check that they do
439 not collide with OPTION_MD_BASE. See as.h. */
442 static const struct option std_longopts[] =
444 /* Note: commas are placed at the start of the line rather than
445 the end of the preceeding line so that it is simpler to
446 selectively add and remove lines from this list. */
447 {"alternate", no_argument, NULL, OPTION_ALTERNATE}
448 /* The entry for "a" is here to prevent getopt_long_only() from
449 considering that -a is an abbreviation for --alternate. This is
450 necessary because -a=<FILE> is a valid switch but getopt would
451 normally reject it since --alternate does not take an argument. */
452 ,{"a", optional_argument, NULL, 'a'}
453 /* Handle -al=<FILE>. */
454 ,{"al", optional_argument, NULL, OPTION_AL}
455 ,{"debug-prefix-map", required_argument, NULL, OPTION_DEBUG_PREFIX_MAP}
456 ,{"defsym", required_argument, NULL, OPTION_DEFSYM}
457 ,{"dump-config", no_argument, NULL, OPTION_DUMPCONFIG}
458 ,{"emulation", required_argument, NULL, OPTION_EMULATION}
459 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
460 ,{"execstack", no_argument, NULL, OPTION_EXECSTACK}
461 ,{"noexecstack", no_argument, NULL, OPTION_NOEXECSTACK}
463 ,{"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
464 ,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF2}
465 /* GCC uses --gdwarf-2 but GAS uses to use --gdwarf2,
466 so we keep it here for backwards compatibility. */
467 ,{"gdwarf2", no_argument, NULL, OPTION_GDWARF2}
468 ,{"gen-debug", no_argument, NULL, 'g'}
469 ,{"gstabs", no_argument, NULL, OPTION_GSTABS}
470 ,{"gstabs+", no_argument, NULL, OPTION_GSTABS_PLUS}
471 ,{"hash-size", required_argument, NULL, OPTION_HASH_TABLE_SIZE}
472 ,{"help", no_argument, NULL, OPTION_HELP}
474 /* New option for extending instruction set (see also -t above).
475 The "-t file" or "--itbl file" option extends the basic set of
476 valid instructions by reading "file", a text file containing a
477 list of instruction formats. The additional opcodes and their
478 formats are added to the built-in set of instructions, and
479 mnemonics for new registers may also be defined. */
480 ,{"itbl", required_argument, NULL, 't'}
482 /* getopt allows abbreviations, so we do this to stop it from
483 treating -k as an abbreviation for --keep-locals. Some
484 ports use -k to enable PIC assembly. */
485 ,{"keep-locals", no_argument, NULL, 'L'}
486 ,{"keep-locals", no_argument, NULL, 'L'}
487 ,{"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH}
488 ,{"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2}
489 ,{"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH}
490 ,{"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES}
491 ,{"MD", required_argument, NULL, OPTION_DEPFILE}
492 ,{"mri", no_argument, NULL, 'M'}
493 ,{"nocpp", no_argument, NULL, OPTION_NOCPP}
494 ,{"no-warn", no_argument, NULL, 'W'}
495 ,{"reduce-memory-overheads", no_argument, NULL, OPTION_REDUCE_MEMORY_OVERHEADS}
496 ,{"statistics", no_argument, NULL, OPTION_STATISTICS}
497 ,{"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE}
498 ,{"version", no_argument, NULL, OPTION_VERSION}
499 ,{"verbose", no_argument, NULL, OPTION_VERBOSE}
500 ,{"target-help", no_argument, NULL, OPTION_TARGET_HELP}
501 ,{"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT}
502 ,{"warn", no_argument, NULL, OPTION_WARN}
505 /* Construct the option lists from the standard list and the target
506 dependent list. Include space for an extra NULL option and
507 always NULL terminate. */
508 shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
509 longopts = xmalloc (sizeof (std_longopts) + md_longopts_size + sizeof (struct option));
510 memcpy (longopts, std_longopts, sizeof (std_longopts));
511 memcpy (((char *) longopts) + sizeof (std_longopts), md_longopts, md_longopts_size);
512 memset (((char *) longopts) + sizeof (std_longopts) + md_longopts_size,
513 0, sizeof (struct option));
515 /* Make a local copy of the old argv. */
519 /* Initialize a new argv that contains no options. */
520 new_argv = xmalloc (sizeof (char *) * (old_argc + 1));
521 new_argv[0] = old_argv[0];
523 new_argv[new_argc] = NULL;
527 /* getopt_long_only is like getopt_long, but '-' as well as '--' can
528 indicate a long option. */
530 int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
539 /* md_parse_option should return 1 if it recognizes optc,
541 if (md_parse_option (optc, optarg) != 0)
543 /* `-v' isn't included in the general short_opts list, so check for
544 it explicitly here before deciding we've gotten a bad argument. */
548 /* Telling getopt to treat -v's value as optional can result
549 in it picking up a following filename argument here. The
550 VMS code in md_parse_option can return 0 in that case,
551 but it has no way of pushing the filename argument back. */
552 if (optarg && *optarg)
553 new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
564 as_bad (_("unrecognized option -%c%s"), optc, optarg ? optarg : "");
570 case 1: /* File name. */
571 if (!strcmp (optarg, "-"))
573 new_argv[new_argc++] = optarg;
574 new_argv[new_argc] = NULL;
577 case OPTION_TARGET_HELP:
578 md_show_usage (stdout);
588 case OPTION_STATISTICS:
589 flag_print_statistics = 1;
592 case OPTION_STRIP_LOCAL_ABSOLUTE:
593 flag_strip_local_absolute = 1;
596 case OPTION_TRADITIONAL_FORMAT:
597 flag_traditional_format = 1;
601 /* This output is intended to follow the GNU standards document. */
602 printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
603 printf (_("Copyright 2008 Free Software Foundation, Inc.\n"));
605 This program is free software; you may redistribute it under the terms of\n\
606 the GNU General Public License version 3 or later.\n\
607 This program has absolutely no warranty.\n"));
608 printf (_("This assembler was configured for a target of `%s'.\n"),
612 case OPTION_EMULATION:
613 #ifdef USE_EMULATIONS
614 if (strcmp (optarg, this_emulation->name))
615 as_fatal (_("multiple emulation names specified"));
617 as_fatal (_("emulations not handled in this configuration"));
621 case OPTION_DUMPCONFIG:
622 fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
623 fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
624 fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
625 #ifdef TARGET_OBJ_FORMAT
626 fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
629 fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
633 case OPTION_DEBUG_PREFIX_MAP:
634 add_debug_prefix_map (optarg);
641 struct defsym_list *n;
643 for (s = optarg; *s != '\0' && *s != '='; s++)
646 as_fatal (_("bad defsym; format is --defsym name=value"));
648 i = bfd_scan_vma (s, (const char **) NULL, 0);
649 n = xmalloc (sizeof *n);
660 /* optarg is the name of the file containing the instruction
661 formats, opcodes, register names, etc. */
662 struct itbl_file_list *n;
666 as_warn (_("no file name following -t option"));
670 n = xmalloc (sizeof * n);
671 n->next = itbl_files;
675 /* Parse the file and add the new instructions to our internal
676 table. If multiple instruction tables are specified, the
677 information from this table gets appended onto the existing
679 itbl_files->name = xstrdup (optarg);
680 if (itbl_parse (itbl_files->name) != 0)
681 as_fatal (_("failed to read instruction table %s\n"),
688 start_dependencies (optarg);
692 /* Some backends, eg Alpha and Mips, use the -g switch for their
693 own purposes. So we check here for an explicit -g and allow
694 the backend to decide if it wants to process it. */
695 if ( old_argv[optind - 1][1] == 'g'
696 && md_parse_option (optc, optarg))
699 if (md_debug_format_selector)
700 debug_type = md_debug_format_selector (& use_gnu_debug_info_extensions);
702 debug_type = DEBUG_DWARF2;
704 debug_type = DEBUG_STABS;
707 case OPTION_GSTABS_PLUS:
708 use_gnu_debug_info_extensions = 1;
711 debug_type = DEBUG_STABS;
715 debug_type = DEBUG_DWARF2;
719 flag_signed_overflow_ok = 1;
722 #ifndef WORKING_DOT_WORD
724 flag_warn_displacement = 1;
728 flag_keep_locals = 1;
731 case OPTION_LISTING_LHS_WIDTH:
732 listing_lhs_width = atoi (optarg);
733 if (listing_lhs_width_second < listing_lhs_width)
734 listing_lhs_width_second = listing_lhs_width;
736 case OPTION_LISTING_LHS_WIDTH2:
738 int tmp = atoi (optarg);
740 if (tmp > listing_lhs_width)
741 listing_lhs_width_second = tmp;
744 case OPTION_LISTING_RHS_WIDTH:
745 listing_rhs_width = atoi (optarg);
747 case OPTION_LISTING_CONT_LINES:
748 listing_lhs_cont_lines = atoi (optarg);
759 flag_readonly_data_in_text = 1;
763 flag_no_warnings = 1;
767 flag_no_warnings = 0;
768 flag_fatal_warnings = 0;
771 case OPTION_WARN_FATAL:
772 flag_no_warnings = 0;
773 flag_fatal_warnings = 1;
776 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
777 case OPTION_EXECSTACK:
779 flag_noexecstack = 0;
782 case OPTION_NOEXECSTACK:
783 flag_noexecstack = 1;
788 flag_always_generate_output = 1;
792 listing |= LISTING_LISTING;
794 listing_filename = xstrdup (optarg);
797 case OPTION_ALTERNATE:
798 optarg = old_argv [optind - 1];
799 while (* optarg == '-')
802 if (strcmp (optarg, "alternate") == 0)
804 flag_macro_alternate = 1;
813 if (optarg != old_argv[optind] && optarg[-1] == '=')
816 if (md_parse_option (optc, optarg) != 0)
824 listing |= LISTING_NOCOND;
827 listing |= LISTING_NODEBUG;
830 listing |= LISTING_GENERAL;
833 listing |= LISTING_HLL;
836 listing |= LISTING_LISTING;
839 listing |= LISTING_MACEXP;
842 listing |= LISTING_NOFORM;
845 listing |= LISTING_SYMBOLS;
848 listing_filename = xstrdup (optarg + 1);
849 optarg += strlen (listing_filename);
852 as_fatal (_("invalid listing option `%c'"), *optarg);
859 listing = LISTING_DEFAULT;
863 /* DEBUG is implemented: it debugs different
864 things from other people's assemblers. */
869 flag_no_comments = 1;
873 { /* Include file directory. */
874 char *temp = xstrdup (optarg);
876 add_include_dir (temp);
881 out_file_name = xstrdup (optarg);
888 /* -X means treat warnings as errors. */
891 case OPTION_REDUCE_MEMORY_OVERHEADS:
892 /* The only change we make at the moment is to reduce
893 the size of the hash tables that we use. */
894 set_gas_hash_table_size (4051);
897 case OPTION_HASH_TABLE_SIZE:
899 unsigned long new_size;
901 new_size = strtoul (optarg, NULL, 0);
903 set_gas_hash_table_size (new_size);
905 as_fatal (_("--hash-size needs a numeric argument"));
917 #ifdef md_after_parse_args
918 md_after_parse_args ();
923 dump_statistics (void)
926 char *lim = (char *) sbrk (0);
928 long run_time = get_run_time () - start_time;
930 fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
931 myname, run_time / 1000000, run_time % 1000000);
933 fprintf (stderr, _("%s: data size %ld\n"),
934 myname, (long) (lim - (char *) &environ));
937 subsegs_print_statistics (stderr);
938 write_print_statistics (stderr);
939 symbol_print_statistics (stderr);
940 read_print_statistics (stderr);
942 #ifdef tc_print_statistics
943 tc_print_statistics (stderr);
946 #ifdef obj_print_statistics
947 obj_print_statistics (stderr);
952 close_output_file (void)
954 output_file_close (out_file_name);
957 /* The interface between the macro code and gas expression handling. */
960 macro_expr (const char *emsg, int idx, sb *in, int *val)
967 hold = input_line_pointer;
968 input_line_pointer = in->ptr + idx;
969 expression_and_evaluate (&ex);
970 idx = input_line_pointer - in->ptr;
971 input_line_pointer = hold;
973 if (ex.X_op != O_constant)
976 *val = (int) ex.X_add_number;
981 /* Here to attempt 1 pass over each input file.
982 We scan argv[*] looking for filenames or exactly "" which is
983 shorthand for stdin. Any argv that is NULL is not a file-name.
984 We set need_pass_2 TRUE if, after this, we still have unresolved
985 expressions of the form (unknown value)+-(unknown value).
987 Note the un*x semantics: there is only 1 logical input file, but it
988 may be a catenation of many 'physical' input files. */
991 perform_an_assembly_pass (int argc, char ** argv)
998 /* Create the standard sections, and those the assembler uses
1000 text_section = subseg_new (TEXT_SECTION_NAME, 0);
1001 data_section = subseg_new (DATA_SECTION_NAME, 0);
1002 bss_section = subseg_new (BSS_SECTION_NAME, 0);
1003 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
1004 to have relocs, otherwise we don't find out in time. */
1005 applicable = bfd_applicable_section_flags (stdoutput);
1006 bfd_set_section_flags (stdoutput, text_section,
1007 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1008 | SEC_CODE | SEC_READONLY));
1009 bfd_set_section_flags (stdoutput, data_section,
1010 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
1012 bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
1013 seg_info (bss_section)->bss = 1;
1014 subseg_new (BFD_ABS_SECTION_NAME, 0);
1015 subseg_new (BFD_UND_SECTION_NAME, 0);
1016 reg_section = subseg_new ("*GAS `reg' section*", 0);
1017 expr_section = subseg_new ("*GAS `expr' section*", 0);
1019 subseg_set (text_section, 0);
1021 /* This may add symbol table entries, which requires having an open BFD,
1022 and sections already created. */
1039 { /* Is it a file-name argument? */
1042 /* argv->"" if stdin desired, else->filename. */
1043 read_a_source_file (*argv);
1045 argv++; /* Completed that argv. */
1048 read_a_source_file ("");
1053 create_obj_attrs_section (void)
1061 size = bfd_elf_obj_attr_size (stdoutput);
1064 name = get_elf_backend_data (stdoutput)->obj_attrs_section;
1066 name = ".gnu.attributes";
1067 s = subseg_new (name, 0);
1068 elf_section_type (s)
1069 = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
1070 bfd_set_section_flags (stdoutput, s, SEC_READONLY | SEC_DATA);
1071 addr = frag_now_fix ();
1072 p = frag_more (size);
1073 bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
1080 main (int argc, char ** argv)
1082 char ** argv_orig = argv;
1087 start_time = get_run_time ();
1089 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
1090 setlocale (LC_MESSAGES, "");
1092 #if defined (HAVE_SETLOCALE)
1093 setlocale (LC_CTYPE, "");
1095 bindtextdomain (PACKAGE, LOCALEDIR);
1096 textdomain (PACKAGE);
1101 #ifdef HOST_SPECIAL_INIT
1102 HOST_SPECIAL_INIT (argc, argv);
1106 xmalloc_set_program_name (myname);
1108 expandargv (&argc, &argv);
1110 START_PROGRESS (myname, 0);
1112 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
1113 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
1116 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
1120 bfd_set_error_program_name (myname);
1122 #ifdef USE_EMULATIONS
1123 select_emulation_mode (argc, argv);
1127 /* Call parse_args before any of the init/begin functions
1128 so that switches like --hash-size can be honored. */
1129 parse_args (&argc, &argv);
1134 input_scrub_begin ();
1137 /* It has to be called after dump_statistics (). */
1138 xatexit (close_output_file);
1140 if (flag_print_statistics)
1141 xatexit (dump_statistics);
1145 macro_strip_at = flag_mri;
1148 macro_init (flag_macro_alternate, flag_mri, macro_strip_at, macro_expr);
1152 output_file_create (out_file_name);
1153 assert (stdoutput != 0);
1155 #ifdef tc_init_after_args
1156 tc_init_after_args ();
1161 /* Now that we have fully initialized, and have created the output
1162 file, define any symbols requested by --defsym command line
1164 while (defsyms != NULL)
1167 struct defsym_list *next;
1169 sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
1170 &zero_address_frag);
1171 /* Make symbols defined on the command line volatile, so that they
1172 can be redefined inside a source file. This makes this assembler's
1173 behaviour compatible with earlier versions, but it may not be
1174 completely intuitive. */
1175 S_SET_VOLATILE (sym);
1176 symbol_table_insert (sym);
1177 next = defsyms->next;
1185 perform_an_assembly_pass (argc, argv);
1187 cond_finish_check (-1);
1195 create_obj_attrs_section ();
1198 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
1199 if ((flag_execstack || flag_noexecstack)
1200 && OUTPUT_FLAVOR == bfd_target_elf_flavour)
1204 gnustack = subseg_new (".note.GNU-stack", 0);
1205 bfd_set_section_flags (stdoutput, gnustack,
1206 SEC_READONLY | (flag_execstack ? SEC_CODE : 0));
1211 /* If we've been collecting dwarf2 .debug_line info, either for
1212 assembly debugging or on behalf of the compiler, emit it now. */
1215 /* If we constructed dwarf2 .eh_frame info, either via .cfi
1216 directives from the user or by the backend, emit it now. */
1219 if (seen_at_least_1_file ()
1220 && (flag_always_generate_output || had_errors () == 0))
1225 /* This used to be done at the start of write_object_file in
1226 write.c, but that caused problems when doing listings when
1227 keep_it was zero. This could probably be moved above md_end, but
1228 I didn't want to risk the change. */
1232 write_object_file ();
1237 listing_print (listing_filename, argv_orig);
1240 if (flag_fatal_warnings && had_warnings () > 0 && had_errors () == 0)
1241 as_bad (_("%d warnings, treating warnings as errors"), had_warnings ());
1243 if (had_errors () > 0 && ! flag_always_generate_output)
1247 unlink_if_ordinary (out_file_name);
1251 END_PROGRESS (myname);
1253 /* Use xexit instead of return, because under VMS environments they
1254 may not place the same interpretation on the value given. */
1255 if (had_errors () > 0)
1256 xexit (EXIT_FAILURE);
1258 /* Only generate dependency file if assembler was successful. */
1259 print_dependencies ();
1261 xexit (EXIT_SUCCESS);