OpenBSD-4.6/gnu/usr.bin/gas/as.c
/* $OpenBSD: as.c,v 1.4 2002/04/20 01:13:44 deraadt Exp $ */
/* as.c - GAS main program.
Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* Main program for AS; a 32-bit assembler of GNU.
* Understands command arguments.
* Has a few routines that don't fit in other modules because they
* are shared.
*
*
* bugs
*
* : initialisers
* Since no-one else says they will support them in future: I
* don't support them now.
*
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: as.c,v 1.4 2002/04/20 01:13:44 deraadt Exp $";
#endif
#include <stdio.h>
#include <string.h>
#ifdef _POSIX_SOURCE
#include <sys/types.h> /* For pid_t in signal.h */
#endif
#include <signal.h>
#define COMMON
#include "as.h"
#include "subsegs.h"
#if __STDC__ == 1
/* This prototype for got_sig() is ansi. If you want
anything else, then your compiler is lying to you when
it says that it is __STDC__. If you want to change it,
#ifdef protect it from those of us with real ansi
compilers. */
#define SIGTY void
static void got_sig(int sig);
static char *stralloc(char *str);
static void perform_an_assembly_pass(int argc, char **argv);
#else /* __STDC__ */
#ifndef SIGTY
#define SIGTY int
#endif
static SIGTY got_sig();
static char *stralloc(); /* Make a (safe) copy of a string. */
static void perform_an_assembly_pass();
#endif /* not __STDC__ */
#ifdef DONTDEF
static char * gdb_symbol_file_name;
long gdb_begin();
#endif
int listing; /* true if a listing is wanted */
char *myname; /* argv[0] */
extern const char version_string[];
int main(argc,argv)
int argc;
char **argv;
{
int work_argc; /* variable copy of argc */
char **work_argv; /* variable copy of argv */
char *arg; /* an arg to program */
char a; /* an arg flag (after -) */
static const int sig[] = { SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
for (a=0;sig[a] != 0;a++)
if (signal(sig[a], SIG_IGN) != SIG_IGN)
signal(sig[a], got_sig);
myname=argv[0];
memset(flagseen, '\0', sizeof(flagseen)); /* aint seen nothing yet */
#ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
#define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
#endif /* OBJ_DEFAULT_OUTPUT_FILE_NAME */
out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
symbol_begin(); /* symbols.c */
subsegs_begin(); /* subsegs.c */
read_begin(); /* read.c */
md_begin(); /* MACHINE.c */
input_scrub_begin(); /* input_scrub.c */
#ifdef DONTDEF
gdb_symbol_file_name = 0;
#endif
/*
* Parse arguments, but we are only interested in flags.
* When we find a flag, we process it then make it's argv[] NULL.
* This helps any future argv[] scanners avoid what we processed.
* Since it is easy to do here we interpret the special arg "-"
* to mean "use stdin" and we set that argv[] pointing to "".
* After we have munged argv[], the only things left are source file
* name(s) and ""(s) denoting stdin. These file names are used
* (perhaps more than once) later.
*/
/* FIXME-SOMEDAY this should use getopt. */
work_argc = argc-1; /* don't count argv[0] */
work_argv = argv+1; /* skip argv[0] */
for (;work_argc--;work_argv++) {
arg = * work_argv; /* work_argv points to this argument */
if (*arg != '-') /* Filename. We need it later. */
continue; /* Keep scanning args looking for flags. */
if (arg[1] == '-' && arg[2] == 0) {
/* "--" as an argument means read STDIN */
/* on this scan, we don't want to think about filenames */
* work_argv = ""; /* Code that means 'use stdin'. */
continue;
}
/* This better be a switch. */
arg ++; /*->letter. */
while ((a = * arg) != '\0') {/* scan all the 1-char flags */
arg ++; /* arg->after letter. */
a &= 0x7F; /* ascii only please */
/* if (flagseen[a])
as_tsktsk("%s: Flag option - %c has already been seen.", myname, a); */
flagseen[a] = 1;
switch (a) {
case 'a':
{
int loop =1;
while (loop) {
switch (*arg)
{
case 'l':
listing |= LISTING_LISTING;
arg++;
break;
case 's':
listing |= LISTING_SYMBOLS;
arg++;
break;
case 'h':
listing |= LISTING_HLL;
arg++;
break;
case 'n':
listing |= LISTING_NOFORM;
arg++;
break;
case 'd':
listing |= LISTING_NODEBUG;
arg++;
break;
default:
if (!listing)
listing= LISTING_DEFAULT;
loop = 0;
break;
}
}
}
break;
case 'f':
break; /* -f means fast - no need for "app" preprocessor. */
case 'D':
/* DEBUG is implemented: it debugs different */
/* things to other people's assemblers. */
break;
#ifdef DONTDEF
case 'G': /* GNU AS switch: include gdbsyms. */
if (*arg) /* Rest of argument is file-name. */
gdb_symbol_file_name = stralloc (arg);
else if (work_argc) { /* Next argument is file-name. */
work_argc --;
* work_argv = NULL; /* Not a source file-name. */
gdb_symbol_file_name = * ++ work_argv;
} else
as_warn("%s: I expected a filename after -G", myname);
arg = ""; /* Finished with this arg. */
break;
#endif
case 'I': { /* Include file directory */
char *temp = NULL;
if (*arg)
temp = stralloc (arg);
else if (work_argc) {
* work_argv = NULL;
work_argc--;
temp = * ++ work_argv;
}
if (temp) {
add_include_dir (temp);
arg = ""; /* Finished with this arg. */
} else
as_warn("%s: I expected a filename after -I", myname);
break;
}
case 'L': /* -L means keep L* symbols */
break;
case 'o':
if (*arg) /* Rest of argument is object file-name. */
out_file_name = stralloc (arg);
else if (work_argc) { /* Want next arg for a file-name. */
* work_argv = NULL; /* This is not a file-name. */
work_argc--;
out_file_name = * ++ work_argv;
} else
as_warn("%s: I expected a filename after -o. \"%s\" assumed.", myname, out_file_name);
arg = ""; /* Finished with this arg. */
break;
case 'R':
/* -R means put data into text segment */
break;
case 'v':
#ifdef OBJ_VMS
{
extern char *compiler_version_string;
compiler_version_string = arg;
}
#else /* not OBJ_VMS */
fprintf(stderr,version_string);
if (*arg && strcmp(arg,"ersion"))
as_warn("Unknown -v option ignored");
#endif /* not OBJ_VMS */
while (*arg) arg++; /* Skip the rest */
break;
case 'W':
/* -W means don't warn about things */
case 'X':
/* -X means treat warnings as errors */
case 'Z':
/* -Z means attempt to generate object file even after errors. */
break;
default:
--arg;
if (md_parse_option(&arg,&work_argc,&work_argv) == 0)
as_warn("%s: I don't understand '%c' flag.", myname, a);
if (arg && *arg)
arg++;
break;
}
}
/*
* We have just processed a "-..." arg, which was not a
* file-name. Smash it so the
* things that look for filenames won't ever see it.
*
* Whatever work_argv points to, it has already been used
* as part of a flag, so DON'T re-use it as a filename.
*/
*work_argv = NULL; /* NULL means 'not a file-name' */
}
#ifdef PIC
if (flagseen['K'] || flagseen['k'])
picmode = 1;
#endif
#ifdef DONTDEF
if (gdb_begin(gdb_symbol_file_name) == 0)
flagseen['G'] = 0; /* Don't do any gdbsym stuff. */
#endif
/* Here with flags set up in flagseen[]. */
perform_an_assembly_pass(argc,argv); /* Assemble it. */
#ifdef TC_I960
brtab_emit();
#endif
if (seen_at_least_1_file()
&& !((had_warnings() && flagseen['Z'])
|| had_errors() > 0)) {
write_object_file(); /* relax() addresses then emit object file */
} /* we also check in write_object_file() just before emit. */
input_scrub_end();
md_end(); /* MACHINE.c */
#ifndef NO_LISTING
listing_print("");
#endif
#ifndef HO_VMS
return((had_warnings() && flagseen['Z'])
|| had_errors() > 0); /* WIN */
#else /* HO_VMS */
return(!((had_warnings() && flagseen['Z'])
|| had_errors() > 0)); /* WIN */
#endif /* HO_VMS */
} /* main() */
/* perform_an_assembly_pass()
*
* Here to attempt 1 pass over each input file.
* We scan argv[*] looking for filenames or exactly "" which is
* shorthand for stdin. Any argv that is NULL is not a file-name.
* We set need_pass_2 TRUE if, after this, we still have unresolved
* expressions of the form (unknown value)+-(unknown value).
*
* Note the un*x semantics: there is only 1 logical input file, but it
* may be a catenation of many 'physical' input files.
*/
static void perform_an_assembly_pass(argc, argv)
int argc;
char **argv;
{
int saw_a_file = 0;
need_pass_2 = 0;
#ifdef MANY_SEGMENTS
unsigned int i;
for (i= SEG_E0; i < SEG_UNKNOWN; i++)
{
segment_info[i].fix_root = 0;
}
/* Create the three fixed ones */
subseg_new (SEG_E0, 0);
subseg_new (SEG_E1, 0);
subseg_new (SEG_E2, 0);
strcpy(segment_info[SEG_E0].scnhdr.s_name,".text");
strcpy(segment_info[SEG_E1].scnhdr.s_name,".data");
strcpy(segment_info[SEG_E2].scnhdr.s_name,".bss");
subseg_new (SEG_E0, 0);
#else /* not MANY_SEGMENTS */
text_fix_root = NULL;
data_fix_root = NULL;
bss_fix_root = NULL;
subseg_new (SEG_TEXT, 0);
#endif /* not MANY_SEGMENTS */
argv++; /* skip argv[0] */
argc--; /* skip argv[0] */
while (argc--) {
if (*argv) { /* Is it a file-name argument? */
saw_a_file++;
/* argv->"" if stdin desired, else->filename */
read_a_source_file(*argv);
}
argv++; /* completed that argv */
}
if (!saw_a_file)
read_a_source_file("");
} /* perform_an_assembly_pass() */
/*
* stralloc()
*
* Allocate memory for a new copy of a string. Copy the string.
* Return the address of the new string. Die if there is any error.
*/
static char *
stralloc (str)
char * str;
{
register char * retval;
register long len;
len = strlen (str) + 1;
retval = xmalloc (len);
(void) strcpy(retval, str);
return(retval);
}
#ifdef comment
static void lose() {
as_fatal("%s: 2nd pass not implemented - get your code from random(3)", myname);
return;
} /* lose() */
#endif /* comment */
static SIGTY
got_sig(sig)
int sig;
{
static here_before = 0;
as_bad("Interrupted by signal %d", sig);
if (here_before++)
_exit(1);
return((SIGTY) 0);
}
/*
* Local Variables:
* comment-column: 0
* fill-column: 131
* End:
*/
/* end of as.c */