325 lines
8.5 KiB
C
325 lines
8.5 KiB
C
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/*-
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* This code is derived from software copyrighted by the Free Software
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* Foundation.
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*
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* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)as.c 6.3 (Berkeley) 5/8/91";
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#endif /* not lint */
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/* as.c - GAS main program.
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Copyright (C) 1987 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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* Main program for AS; a 32-bit assembler of GNU.
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* Understands command arguments.
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* Has a few routines that don't fit in other modules because they
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* are shared.
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*
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*
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* bugs
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*
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* : initialisers
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* Since no-one else says they will support them in future: I
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* don't support them now.
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*
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*/
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#ifdef _POSIX_SOURCE
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#include <sys/types.h> /* For pid_t in signal.h */
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#endif
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#include <signal.h>
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#define COMMON
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#include "as.h"
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#include "struc-symbol.h"
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#include "write.h"
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/* Warning! This may have some slightly strange side effects
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if you try to compile two or more assemblers in the same
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directory!
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*/
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#ifndef SIGTY
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#define SIGTY int
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#endif
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SIGTY got_sig();
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#ifdef DONTDEF
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static char * gdb_symbol_file_name;
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long int gdb_begin();
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#endif
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char *myname; /* argv[0] */
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extern char version_string[];
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main(argc,argv)
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int argc;
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char **argv;
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{
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int work_argc; /* variable copy of argc */
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char **work_argv; /* variable copy of argv */
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char *arg; /* an arg to program */
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char a; /* an arg flag (after -) */
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static const int sig[] = { SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
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extern int bad_error; /* Did we hit a bad error ? */
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char *stralloc(); /* Make a (safe) copy of a string. */
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void symbol_begin();
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void read_begin();
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void write_object_file();
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for(a=0;sig[a]!=0;a++)
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if(signal(sig[a], SIG_IGN) != SIG_IGN)
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signal(sig[a], got_sig);
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myname=argv[0];
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bzero (flagseen, sizeof(flagseen)); /* aint seen nothing yet */
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out_file_name = "a.out"; /* default .o file */
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symbol_begin(); /* symbols.c */
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subsegs_begin(); /* subsegs.c */
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read_begin(); /* read.c */
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md_begin(); /* MACHINE.c */
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input_scrub_begin(); /* input_scrub.c */
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#ifdef DONTDEF
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gdb_symbol_file_name = 0;
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#endif
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/*
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* Parse arguments, but we are only interested in flags.
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* When we find a flag, we process it then make it's argv[] NULL.
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* This helps any future argv[] scanners avoid what we processed.
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* Since it is easy to do here we interpret the special arg "-"
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* to mean "use stdin" and we set that argv[] pointing to "".
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* After we have munged argv[], the only things left are source file
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* name(s) and ""(s) denoting stdin. These file names are used
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* (perhaps more than once) later.
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*/
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work_argc = argc-1; /* don't count argv[0] */
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work_argv = argv+1; /* skip argv[0] */
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for (;work_argc--;work_argv++) {
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arg = * work_argv; /* work_argv points to this argument */
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if (*arg!='-') /* Filename. We need it later. */
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continue; /* Keep scanning args looking for flags. */
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if (arg[1] == '-' && arg[2] == 0) {
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/* "--" as an argument means read STDIN */
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/* on this scan, we don't want to think about filenames */
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* work_argv = ""; /* Code that means 'use stdin'. */
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continue;
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}
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/* This better be a switch. */
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arg ++; /* -> letter. */
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while (a = * arg) {/* scan all the 1-char flags */
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arg ++; /* arg -> after letter. */
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a &= 0x7F; /* ascii only please */
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if (flagseen[a])
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as_warn("%s: Flag option -%c has already been seen!",myname,a);
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flagseen[a] = TRUE;
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switch (a) {
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case 'f':
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break; /* -f means fast - no need for "app" preprocessor. */
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case 'D':
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/* DEBUG is implemented: it debugs different */
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/* things to other people's assemblers. */
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break;
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#ifdef DONTDEF
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case 'G': /* GNU AS switch: include gdbsyms. */
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if (*arg) /* Rest of argument is file-name. */
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gdb_symbol_file_name = stralloc (arg);
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else if (work_argc) { /* Next argument is file-name. */
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work_argc --;
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* work_argv = NULL; /* Not a source file-name. */
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gdb_symbol_file_name = * ++ work_argv;
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} else
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as_warn( "%s: I expected a filename after -G",myname);
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arg = ""; /* Finished with this arg. */
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break;
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#endif
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#ifndef WORKING_DOT_WORD
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case 'k':
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break;
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#endif
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case 'L': /* -L means keep L* symbols */
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break;
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case 'o':
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if (*arg) /* Rest of argument is object file-name. */
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out_file_name = stralloc (arg);
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else if (work_argc) { /* Want next arg for a file-name. */
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* work_argv = NULL; /* This is not a file-name. */
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work_argc--;
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out_file_name = * ++ work_argv;
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} else
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as_warn("%s: I expected a filename after -o. \"%s\" assumed.",myname,out_file_name);
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arg = ""; /* Finished with this arg. */
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break;
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case 'R':
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/* -R means put data into text segment */
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break;
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case 'v':
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#ifdef VMS
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{
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extern char *compiler_version_string;
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compiler_version_string = arg;
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}
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#else /* not VMS */
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fprintf(stderr,version_string);
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if(*arg && strcmp(arg,"ersion"))
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as_warn("Unknown -v option ignored");
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#endif
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while(*arg) arg++; /* Skip the rest */
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break;
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case 'W':
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/* -W means don't warn about things */
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break;
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case 'g':
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/*
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* -g asks gas to produce gdb/dbx line number
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* and file name stabs so that an assembly
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* file can be handled by a source debugger.
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*/
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break;
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default:
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--arg;
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if(md_parse_option(&arg,&work_argc,&work_argv)==0)
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as_warn("%s: I don't understand '%c' flag!",myname,a);
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if(arg && *arg)
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arg++;
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break;
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}
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}
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/*
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* We have just processed a "-..." arg, which was not a
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* file-name. Smash it so the
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* things that look for filenames won't ever see it.
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*
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* Whatever work_argv points to, it has already been used
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* as part of a flag, so DON'T re-use it as a filename.
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*/
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*work_argv = NULL; /* NULL means 'not a file-name' */
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}
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#ifdef DONTDEF
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if (gdb_begin(gdb_symbol_file_name) == 0)
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flagseen ['G'] = 0; /* Don't do any gdbsym stuff. */
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#endif
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/* Here with flags set up in flagseen[]. */
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perform_an_assembly_pass(argc,argv); /* Assemble it. */
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if (seen_at_least_1_file() && !bad_error)
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write_object_file();/* relax() addresses then emit object file */
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input_scrub_end();
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md_end(); /* MACHINE.c */
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#ifndef VMS
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exit(bad_error); /* WIN */
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#else /* VMS */
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exit(!bad_error); /* WIN */
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#endif /* VMS */
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}
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/* perform_an_assembly_pass()
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*
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* Here to attempt 1 pass over each input file.
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* We scan argv[*] looking for filenames or exactly "" which is
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* shorthand for stdin. Any argv that is NULL is not a file-name.
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* We set need_pass_2 TRUE if, after this, we still have unresolved
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* expressions of the form (unknown value)+-(unknown value).
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*
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* Note the un*x semantics: there is only 1 logical input file, but it
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* may be a catenation of many 'physical' input files.
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*/
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perform_an_assembly_pass (argc, argv)
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int argc;
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char ** argv;
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{
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char * buffer; /* Where each bufferful of lines will start. */
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void read_a_source_file();
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int saw_a_file = 0;
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text_fix_root = NULL;
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data_fix_root = NULL;
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need_pass_2 = FALSE;
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argv++; /* skip argv[0] */
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argc--; /* skip argv[0] */
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while (argc--) {
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if (*argv) { /* Is it a file-name argument? */
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/* argv -> "" if stdin desired, else -> filename */
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if (buffer = input_scrub_new_file (*argv) ) {
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saw_a_file++;
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read_a_source_file(buffer);
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}
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}
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argv++; /* completed that argv */
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}
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if(!saw_a_file)
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if(buffer = input_scrub_new_file("") )
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read_a_source_file(buffer);
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}
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/*
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* stralloc()
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*
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* Allocate memory for a new copy of a string. Copy the string.
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* Return the address of the new string. Die if there is any error.
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*/
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char *
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stralloc (str)
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char * str;
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{
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register char * retval;
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register long int len;
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len = strlen (str) + 1;
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retval = xmalloc (len);
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(void)strcpy (retval, str);
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return (retval);
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}
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lose()
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{
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as_fatal( "%s: 2nd pass not implemented - get your code from random(3)",myname );
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}
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SIGTY
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got_sig(sig)
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int sig;
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{
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static here_before = 0;
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as_bad("Interrupted by signal %d",sig);
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if(here_before++)
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exit(1);
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}
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/* end: as.c */
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