471 lines
12 KiB
C
471 lines
12 KiB
C
/* as.c - GAS main program.
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Copyright (C) 1987, 1990, 1991, 1992 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 2, 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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#include <stdio.h>
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#include <string.h>
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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 "config.h"
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#include "subsegs.h"
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#ifndef SIGTY
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#ifdef __STDC__
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#define SIGTY void
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#else
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#define SIGTY int
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#endif /* __STDC__ */
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#endif /* SIGTY */
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static SIGTY got_sig PARAMS ((int sig));
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static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
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#ifndef EXIT_SUCCESS
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#define EXIT_SUCCESS 0
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#define EXIT_FAILURE 1
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#endif
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int listing; /* true if a listing is wanted */
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char *myname; /* argv[0] */
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#ifdef BFD_ASSEMBLER
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segT big_section, reg_section, pass1_section;
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segT diff_section, absent_section;
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segT text_section, data_section, bss_section;
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#endif
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void
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print_version_id ()
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{
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static int printed;
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if (printed)
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return;
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printed = 1;
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fprintf (stderr, "GNU assembler version %s (%s)", GAS_VERSION, TARGET_ALIAS);
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#ifdef BFD_ASSEMBLER
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fprintf (stderr, ", using BFD version %s", BFD_VERSION);
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#endif
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fprintf (stderr, "\n");
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}
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int
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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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#if 0 /* do we need any of this?? */
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{
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static const int sig[] = {SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
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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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}
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#endif
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myname = argv[0];
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memset (flagseen, '\0', sizeof (flagseen)); /* aint seen nothing yet */
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#ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
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#define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
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#endif
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out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
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#ifdef BFD_ASSEMBLER
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bfd_init ();
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#endif
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symbol_begin ();
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subsegs_begin ();
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read_begin ();
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input_scrub_begin ();
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frag_init ();
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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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/* FIXME-SOMEDAY this should use getopt. */
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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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{
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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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{
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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) != '\0')
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{ /* 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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flagseen[a] = 1;
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switch (a)
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{
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case 'a':
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{
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int loop = 1;
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while (loop)
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{
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switch (*arg)
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{
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case 'l':
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listing |= LISTING_LISTING;
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arg++;
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break;
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case 's':
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listing |= LISTING_SYMBOLS;
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arg++;
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break;
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case 'h':
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listing |= LISTING_HLL;
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arg++;
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break;
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case 'n':
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listing |= LISTING_NOFORM;
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arg++;
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break;
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case 'd':
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listing |= LISTING_NODEBUG;
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arg++;
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break;
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default:
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if (!listing)
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listing = LISTING_DEFAULT;
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loop = 0;
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break;
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}
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}
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}
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break;
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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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case 'I':
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{ /* Include file directory */
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char *temp = NULL;
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if (*arg)
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{
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temp = strdup (arg);
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if (!temp)
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as_fatal ("virtual memory exhuasted");
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}
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else if (work_argc)
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{
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*work_argv = NULL;
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work_argc--;
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temp = *++work_argv;
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}
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else
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as_warn ("%s: I expected a filename after -I", myname);
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add_include_dir (temp);
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arg = ""; /* Finished with this arg. */
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break;
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}
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#ifdef WARN_SIGNED_OVERFLOW_WORD
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/* Don't warn about signed overflow. */
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case 'J':
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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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{
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out_file_name = strdup (arg);
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if (!out_file_name)
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as_fatal ("virtual memory exhausted");
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}
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else if (work_argc)
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{ /* 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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}
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else
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as_warn ("%s: I expected a filename after -o. \"%s\" assumed.",
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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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flag_readonly_data_in_text = 1;
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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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if (*arg && strcmp (arg, "ersion"))
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{
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as_warn ("Unknown option `-v%s' ignored", arg);
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arg += strlen (arg);
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break;
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}
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print_version_id ();
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#endif /* not VMS */
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while (*arg)
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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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flag_suppress_warnings = 1;
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break;
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case 'w':
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case 'X':
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/* -X means treat warnings as errors */
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break;
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case 'Z':
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/* -Z means attempt to generate object file even after errors. */
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flag_always_generate_output = 1;
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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 BFD_ASSEMBLER
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output_file_create (out_file_name);
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assert (stdoutput != 0);
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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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#ifdef TC_I960
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brtab_emit ();
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#endif
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if (seen_at_least_1_file ()
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&& !((had_warnings () && flag_always_generate_output)
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|| had_errors () > 0))
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{
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write_object_file (); /* relax() addresses then emit object file */
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} /* we also check in write_object_file() just before emit. */
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#ifdef BFD_ASSEMBLER
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else
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{
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output_file_close (out_file_name);
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unlink (out_file_name);
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}
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#endif
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input_scrub_end ();
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md_end (); /* MACHINE.c */
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#ifndef NO_LISTING
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listing_print ("");
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#endif
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if ((had_warnings () && flagseen['Z'])
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|| had_errors () > 0)
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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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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static void
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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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int saw_a_file = 0;
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#ifdef BFD_ASSEMBLER
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flagword applicable;
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#endif
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need_pass_2 = 0;
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#ifndef BFD_ASSEMBLER
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#ifdef MANY_SEGMENTS
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{
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unsigned int i;
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for (i = SEG_E0; i < SEG_UNKNOWN; i++)
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segment_info[i].fix_root = 0;
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}
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/* Create the three fixed ones */
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subseg_new (SEG_E0, 0);
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subseg_new (SEG_E1, 0);
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subseg_new (SEG_E2, 0);
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strcpy (segment_info[SEG_E0].scnhdr.s_name, ".text");
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strcpy (segment_info[SEG_E1].scnhdr.s_name, ".data");
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strcpy (segment_info[SEG_E2].scnhdr.s_name, ".bss");
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subseg_new (SEG_E0, 0);
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#else /* not MANY_SEGMENTS */
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text_fix_root = NULL;
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data_fix_root = NULL;
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bss_fix_root = NULL;
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subseg_new (SEG_TEXT, 0);
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#endif /* not MANY_SEGMENTS */
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#else /* BFD_ASSEMBLER */
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/* Create the standard sections, and those the assembler uses
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internally. */
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text_section = subseg_new (".text", 0);
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data_section = subseg_new (".data", 0);
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bss_section = subseg_new (".bss", 0);
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/* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
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to have relocs, otherwise we don't find out in time. */
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applicable = bfd_applicable_section_flags (stdoutput);
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bfd_set_section_flags (stdoutput, text_section,
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applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
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| SEC_CODE | SEC_READONLY));
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/* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
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bfd_set_section_flags (stdoutput, data_section,
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applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
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bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
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subseg_new (BFD_ABS_SECTION_NAME, 0);
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subseg_new (BFD_UND_SECTION_NAME, 0);
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big_section = subseg_new ("*GAS `big' section*", 0);
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reg_section = subseg_new ("*GAS `reg' section*", 0);
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pass1_section = subseg_new ("*GAS `pass1' section*", 0);
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diff_section = subseg_new ("*GAS `diff' section*", 0);
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absent_section = subseg_new ("*GAS `absent' section*", 0);
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subseg_new (".text", 0);
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#endif /* BFD_ASSEMBLER */
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/* This may add symbol table entries, which requires having an open BFD,
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and sections already created, in BFD_ASSEMBLER mode. */
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md_begin ();
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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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{
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if (*argv)
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{ /* Is it a file-name argument? */
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saw_a_file++;
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/* argv->"" if stdin desired, else->filename */
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read_a_source_file (*argv);
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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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read_a_source_file ("");
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} /* perform_an_assembly_pass() */
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static 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 (EXIT_FAILURE);
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#if 0 /* If SIGTY is void, this produces warnings. */
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return ((SIGTY) 0);
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#endif
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}
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/* end of as.c */
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