1 /* as.c - GAS main program.
2 Copyright (C) 1987, 1990, 1991, 1992, 1994 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 * Main program for AS; a 32-bit assembler of GNU.
22 * Understands command arguments.
23 * Has a few routines that don't fit in other modules because they
30 * Since no-one else says they will support them in future: I
31 * don't support them now.
39 #include <sys/types.h> /* For pid_t in signal.h */
47 #include "output-file.h"
58 /* Not currently used. */
59 static SIGTY got_sig PARAMS ((int sig));
61 static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
64 #define EXIT_SUCCESS 0
65 #define EXIT_FAILURE 1
68 int listing; /* true if a listing is wanted */
70 char *myname; /* argv[0] */
72 segT reg_section, expr_section;
73 segT text_section, data_section, bss_section;
76 /* This is true if the assembler should not produce any timing info. */
78 static int quiet_flag = 1;
89 fprintf (stderr, "GNU assembler version %s (%s)", GAS_VERSION, TARGET_ALIAS);
91 fprintf (stderr, ", using BFD version %s", BFD_VERSION);
93 fprintf (stderr, "\n");
101 int work_argc; /* variable copy of argc */
102 char **work_argv; /* variable copy of argv */
103 char *arg; /* an arg to program */
104 char a; /* an arg flag (after -) */
106 long start_time = get_run_time ();
108 #if 0 /* do we need any of this?? */
110 static const int sig[] = {SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
112 for (a = 0; sig[a] != 0; a++)
113 if (signal (sig[a], SIG_IGN) != SIG_IGN)
114 signal (sig[a], got_sig);
119 memset (flagseen, '\0', sizeof (flagseen)); /* aint seen nothing yet */
120 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
121 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
123 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
132 input_scrub_begin ();
135 * Parse arguments, but we are only interested in flags.
136 * When we find a flag, we process it then make it's argv[] NULL.
137 * This helps any future argv[] scanners avoid what we processed.
138 * Since it is easy to do here we interpret the special arg "-"
139 * to mean "use stdin" and we set that argv[] pointing to "".
140 * After we have munged argv[], the only things left are source file
141 * name(s) and ""(s) denoting stdin. These file names are used
142 * (perhaps more than once) later.
144 /* FIXME-SOMEDAY this should use getopt. */
145 work_argc = argc - 1; /* don't count argv[0] */
146 work_argv = argv + 1; /* skip argv[0] */
147 for (; work_argc--; work_argv++)
149 arg = *work_argv; /* work_argv points to this argument */
151 if (*arg != '-') /* Filename. We need it later. */
152 continue; /* Keep scanning args looking for flags. */
153 if (arg[1] == '-' && arg[2] == 0)
155 /* "--" as an argument means read STDIN */
156 /* on this scan, we don't want to think about filenames */
157 *work_argv = ""; /* Code that means 'use stdin'. */
160 /* This better be a switch. */
161 arg++; /*->letter. */
163 while ((a = *arg) != '\0')
164 { /* scan all the 1-char flags */
165 arg++; /* arg->after letter. */
166 a &= 0x7F; /* ascii only please */
167 flagseen[(unsigned char) a] = 1;
179 listing |= LISTING_LISTING;
183 listing |= LISTING_SYMBOLS;
187 listing |= LISTING_HLL;
192 listing |= LISTING_NOFORM;
196 listing |= LISTING_NODEBUG;
201 listing = LISTING_DEFAULT;
212 break; /* -f means fast - no need for "app" preprocessor. */
215 /* DEBUG is implemented: it debugs different */
216 /* things to other people's assemblers. */
220 { /* Include file directory */
227 as_fatal ("virtual memory exhausted");
236 as_warn ("%s: I expected a filename after -I", myname);
237 add_include_dir (temp);
238 arg = ""; /* Finished with this arg. */
242 #ifdef WARN_SIGNED_OVERFLOW_WORD
243 /* Don't warn about signed overflow. */
248 #ifndef WORKING_DOT_WORD
253 case 'L': /* -L means keep L* symbols */
257 if (*arg) /* Rest of argument is object file-name. */
259 out_file_name = strdup (arg);
261 as_fatal ("virtual memory exhausted");
264 { /* Want next arg for a file-name. */
265 *work_argv = NULL; /* This is not a file-name. */
267 out_file_name = *++work_argv;
270 as_warn ("%s: I expected a filename after -o. \"%s\" assumed.",
271 myname, out_file_name);
272 arg = ""; /* Finished with this arg. */
276 if (*arg && strcmp(arg, "oquiet") == 0)
278 else if (*arg && strcmp(arg, "ocpp") == 0)
282 as_warn ("Unknown option `-n%s' ignored", arg);
288 /* -R means put data into text segment */
289 flag_readonly_data_in_text = 1;
295 extern char *compiler_version_string;
296 compiler_version_string = arg;
299 if (*arg && strcmp (arg, "ersion"))
301 as_warn ("Unknown option `-v%s' ignored", arg);
309 arg++; /* Skip the rest */
313 /* -W means don't warn about things */
314 flag_suppress_warnings = 1;
319 /* -X means treat warnings as errors */
322 /* -Z means attempt to generate object file even after errors. */
323 flag_always_generate_output = 1;
328 if (md_parse_option (&arg, &work_argc, &work_argv) == 0)
329 as_warn ("%s: I don't understand '%c' flag.", myname, a);
336 * We have just processed a "-..." arg, which was not a
337 * file-name. Smash it so the
338 * things that look for filenames won't ever see it.
340 * Whatever work_argv points to, it has already been used
341 * as part of a flag, so DON'T re-use it as a filename.
343 *work_argv = NULL; /* NULL means 'not a file-name' */
347 output_file_create (out_file_name);
348 assert (stdoutput != 0);
351 /* Here with flags set up in flagseen[]. */
352 perform_an_assembly_pass (argc, argv); /* Assemble it. */
357 if (seen_at_least_1_file ()
358 && !((had_warnings () && flag_always_generate_output)
359 || had_errors () > 0))
365 write_object_file ();
371 #ifndef BFD_ASSEMBLER
374 output_file_close (out_file_name);
377 unlink (out_file_name);
386 extern char **environ;
387 char *lim = (char *) sbrk (0);
388 long run_time = get_run_time () - start_time;
390 fprintf (stderr, "%s: total time in assembly: %ld.%06ld\n",
391 myname, run_time / 1000000, run_time % 1000000);
392 fprintf (stderr, "%s: data size %ld\n",
393 myname, (long) (lim - (char *) &environ));
396 if ((had_warnings () && flagseen['Z'])
397 || had_errors () > 0)
403 /* perform_an_assembly_pass()
405 * Here to attempt 1 pass over each input file.
406 * We scan argv[*] looking for filenames or exactly "" which is
407 * shorthand for stdin. Any argv that is NULL is not a file-name.
408 * We set need_pass_2 TRUE if, after this, we still have unresolved
409 * expressions of the form (unknown value)+-(unknown value).
411 * Note the un*x semantics: there is only 1 logical input file, but it
412 * may be a catenation of many 'physical' input files.
415 perform_an_assembly_pass (argc, argv)
426 #ifndef BFD_ASSEMBLER
430 for (i = SEG_E0; i < SEG_UNKNOWN; i++)
431 segment_info[i].fix_root = 0;
433 /* Create the three fixed ones */
437 seg = subseg_new (".text", 0);
438 assert (seg == SEG_E0);
439 seg = subseg_new (".data", 0);
440 assert (seg == SEG_E1);
441 seg = subseg_new (".bss", 0);
442 assert (seg == SEG_E2);
445 #else /* not MANY_SEGMENTS */
446 text_fix_root = NULL;
447 data_fix_root = NULL;
449 #endif /* not MANY_SEGMENTS */
450 #else /* BFD_ASSEMBLER */
451 /* Create the standard sections, and those the assembler uses
453 text_section = subseg_new (".text", 0);
454 data_section = subseg_new (".data", 0);
455 bss_section = subseg_new (".bss", 0);
456 /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
457 to have relocs, otherwise we don't find out in time. */
458 applicable = bfd_applicable_section_flags (stdoutput);
459 bfd_set_section_flags (stdoutput, text_section,
460 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
461 | SEC_CODE | SEC_READONLY));
462 /* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
463 bfd_set_section_flags (stdoutput, data_section,
464 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
465 bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
466 seg_info (bss_section)->bss = 1;
467 subseg_new (BFD_ABS_SECTION_NAME, 0);
468 subseg_new (BFD_UND_SECTION_NAME, 0);
469 reg_section = subseg_new ("*GAS `reg' section*", 0);
470 expr_section = subseg_new ("*GAS `expr' section*", 0);
472 #endif /* BFD_ASSEMBLER */
474 subseg_set (text_section, 0);
476 /* This may add symbol table entries, which requires having an open BFD,
477 and sections already created, in BFD_ASSEMBLER mode. */
480 argv++; /* skip argv[0] */
481 argc--; /* skip argv[0] */
485 { /* Is it a file-name argument? */
487 /* argv->"" if stdin desired, else->filename */
488 read_a_source_file (*argv);
490 argv++; /* completed that argv */
493 read_a_source_file ("");
494 } /* perform_an_assembly_pass() */
497 /* This is not currently used. */
502 static here_before = 0;
504 as_bad ("Interrupted by signal %d", sig);
507 #if 0 /* If SIGTY is void, this produces warnings. */