430 lines
11 KiB
C
430 lines
11 KiB
C
/* 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[] = "$Id: as.c,v 1.3 1993/10/02 20:57:15 pk 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;
|
||
} else
|
||
as_warn("%s: I expected a filename after -I", myname);
|
||
add_include_dir (temp);
|
||
arg = ""; /* Finished with this arg. */
|
||
break;
|
||
}
|
||
|
||
#if 00000
|
||
case 'k':
|
||
break;
|
||
#endif
|
||
|
||
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 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 */
|