1 /* as.c - GAS main program.
2 Copyright (C) 1987, 1990, 1991, 1992 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 */
49 /* This prototype for got_sig() is ansi. If you want
50 anything else, then your compiler is lying to you when
51 it says that it is __STDC__. If you want to change it,
52 #ifdef protect it from those of us with real ansi
57 static void got_sig (int sig);
58 static char *stralloc (char *str);
59 static void perform_an_assembly_pass (int argc, char **argv);
67 static SIGTY got_sig ();
68 static char *stralloc (); /* Make a (safe) copy of a string. */
69 static void perform_an_assembly_pass ();
71 #endif /* not __STDC__ */
74 static char *gdb_symbol_file_name;
78 int listing; /* true if a listing is wanted */
80 char *myname; /* argv[0] */
81 extern char version_string[];
88 int work_argc; /* variable copy of argc */
89 char **work_argv; /* variable copy of argv */
90 char *arg; /* an arg to program */
91 char a; /* an arg flag (after -) */
92 static const int sig[] =
93 {SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
95 for (a = 0; sig[a] != 0; a++)
96 if (signal (sig[a], SIG_IGN) != SIG_IGN)
97 signal (sig[a], got_sig);
100 memset (flagseen, '\0', sizeof (flagseen)); /* aint seen nothing yet */
101 #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
102 #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
103 #endif /* OBJ_DEFAULT_OUTPUT_FILE_NAME */
104 out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
106 symbol_begin (); /* symbols.c */
107 subsegs_begin (); /* subsegs.c */
108 read_begin (); /* read.c */
109 md_begin (); /* MACHINE.c */
110 input_scrub_begin (); /* input_scrub.c */
112 gdb_symbol_file_name = 0;
115 * Parse arguments, but we are only interested in flags.
116 * When we find a flag, we process it then make it's argv[] NULL.
117 * This helps any future argv[] scanners avoid what we processed.
118 * Since it is easy to do here we interpret the special arg "-"
119 * to mean "use stdin" and we set that argv[] pointing to "".
120 * After we have munged argv[], the only things left are source file
121 * name(s) and ""(s) denoting stdin. These file names are used
122 * (perhaps more than once) later.
124 /* FIXME-SOMEDAY this should use getopt. */
125 work_argc = argc - 1; /* don't count argv[0] */
126 work_argv = argv + 1; /* skip argv[0] */
127 for (; work_argc--; work_argv++)
129 arg = *work_argv; /* work_argv points to this argument */
131 if (*arg != '-') /* Filename. We need it later. */
132 continue; /* Keep scanning args looking for flags. */
133 if (arg[1] == '-' && arg[2] == 0)
135 /* "--" as an argument means read STDIN */
136 /* on this scan, we don't want to think about filenames */
137 *work_argv = ""; /* Code that means 'use stdin'. */
140 /* This better be a switch. */
141 arg++; /*->letter. */
143 while ((a = *arg) != '\0')
144 { /* scan all the 1-char flags */
145 arg++; /* arg->after letter. */
146 a &= 0x7F; /* ascii only please */
148 as_tsktsk("%s: Flag option - %c has already been seen.", myname, a); */
162 listing |= LISTING_LISTING;
166 listing |= LISTING_SYMBOLS;
170 listing |= LISTING_HLL;
175 listing |= LISTING_NOFORM;
179 listing |= LISTING_NODEBUG;
184 listing = LISTING_DEFAULT;
195 break; /* -f means fast - no need for "app" preprocessor. */
198 /* DEBUG is implemented: it debugs different */
199 /* things to other people's assemblers. */
203 case 'G': /* GNU AS switch: include gdbsyms. */
204 if (*arg) /* Rest of argument is file-name. */
205 gdb_symbol_file_name = stralloc (arg);
207 { /* Next argument is file-name. */
209 *work_argv = NULL; /* Not a source file-name. */
210 gdb_symbol_file_name = *++work_argv;
213 as_warn ("%s: I expected a filename after -G", myname);
214 arg = ""; /* Finished with this arg. */
219 { /* Include file directory */
223 temp = stralloc (arg);
231 as_warn ("%s: I expected a filename after -I", myname);
232 add_include_dir (temp);
233 arg = ""; /* Finished with this arg. */
237 #ifdef WARN_SIGNED_OVERFLOW_WORD
238 /* Don't warn about signed overflow. */
243 #ifndef WORKING_DOT_WORD
248 case 'L': /* -L means keep L* symbols */
252 if (*arg) /* Rest of argument is object file-name. */
253 out_file_name = stralloc (arg);
255 { /* Want next arg for a file-name. */
256 *work_argv = NULL; /* This is not a file-name. */
258 out_file_name = *++work_argv;
261 as_warn ("%s: I expected a filename after -o. \"%s\" assumed.", myname, out_file_name);
262 arg = ""; /* Finished with this arg. */
266 /* -R means put data into text segment */
272 extern char *compiler_version_string;
273 compiler_version_string = arg;
276 fprintf (stderr, version_string);
277 if (*arg && strcmp (arg, "ersion"))
278 as_warn ("Unknown -v option ignored");
281 arg++; /* Skip the rest */
286 /* -W means don't warn about things */
288 /* -X means treat warnings as errors */
290 /* -Z means attempt to generate object file even after errors. */
295 if (md_parse_option (&arg, &work_argc, &work_argv) == 0)
296 as_warn ("%s: I don't understand '%c' flag.", myname, a);
303 * We have just processed a "-..." arg, which was not a
304 * file-name. Smash it so the
305 * things that look for filenames won't ever see it.
307 * Whatever work_argv points to, it has already been used
308 * as part of a flag, so DON'T re-use it as a filename.
310 *work_argv = NULL; /* NULL means 'not a file-name' */
313 if (gdb_begin (gdb_symbol_file_name) == 0)
314 flagseen['G'] = 0; /* Don't do any gdbsym stuff. */
316 /* Here with flags set up in flagseen[]. */
317 perform_an_assembly_pass (argc, argv); /* Assemble it. */
321 if (seen_at_least_1_file ()
322 && !((had_warnings () && flagseen['Z'])
323 || had_errors () > 0))
325 write_object_file (); /* relax() addresses then emit object file */
326 } /* we also check in write_object_file() just before emit. */
329 md_end (); /* MACHINE.c */
336 return ((had_warnings () && flagseen['Z'])
337 || had_errors () > 0);/* WIN */
339 return (!((had_warnings () && flagseen['Z'])
340 || had_errors () > 0)); /* WIN */
346 /* perform_an_assembly_pass()
348 * Here to attempt 1 pass over each input file.
349 * We scan argv[*] looking for filenames or exactly "" which is
350 * shorthand for stdin. Any argv that is NULL is not a file-name.
351 * We set need_pass_2 TRUE if, after this, we still have unresolved
352 * expressions of the form (unknown value)+-(unknown value).
354 * Note the un*x semantics: there is only 1 logical input file, but it
355 * may be a catenation of many 'physical' input files.
358 perform_an_assembly_pass (argc, argv)
369 for (i = SEG_E0; i < SEG_UNKNOWN; i++)
371 segment_info[i].fix_root = 0;
373 /* Create the three fixed ones */
374 subseg_new (SEG_E0, 0);
375 subseg_new (SEG_E1, 0);
376 subseg_new (SEG_E2, 0);
377 strcpy (segment_info[SEG_E0].scnhdr.s_name, ".text");
378 strcpy (segment_info[SEG_E1].scnhdr.s_name, ".data");
379 strcpy (segment_info[SEG_E2].scnhdr.s_name, ".bss");
381 subseg_new (SEG_E0, 0);
382 #else /* not MANY_SEGMENTS */
383 text_fix_root = NULL;
384 data_fix_root = NULL;
387 subseg_new (SEG_TEXT, 0);
388 #endif /* not MANY_SEGMENTS */
390 argv++; /* skip argv[0] */
391 argc--; /* skip argv[0] */
395 { /* Is it a file-name argument? */
397 /* argv->"" if stdin desired, else->filename */
398 read_a_source_file (*argv);
400 argv++; /* completed that argv */
403 read_a_source_file ("");
404 } /* perform_an_assembly_pass() */
409 * Allocate memory for a new copy of a string. Copy the string.
410 * Return the address of the new string. Die if there is any error.
417 register char *retval;
420 len = strlen (str) + 1;
421 retval = xmalloc (len);
422 (void) strcpy (retval, str);
430 as_fatal ("%s: 2nd pass not implemented - get your code from random(3)", myname);
440 static here_before = 0;
442 as_bad ("Interrupted by signal %d", sig);