557 lines
13 KiB
C
557 lines
13 KiB
C
/* as.c - GAS main program.
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Copyright (C) 1987, 1990, 1991, 1992, 1994 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 "ansidecl.h"
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#include "libiberty.h"
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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 "subsegs.h"
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#include "output-file.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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#if 0
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/* Not currently used. */
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static SIGTY got_sig PARAMS ((int sig));
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#endif
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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 reg_section, expr_section;
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segT text_section, data_section, bss_section;
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#endif
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/* This is true if the assembler should output time and space usage. */
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static int statistics_flag = 0;
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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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void
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show_usage (stream)
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FILE *stream;
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{
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fprintf (stream, "Usage: %s [option...] [asmfile...]\n", myname);
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fprintf (stream, "\
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Options:\n\
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-a[sub-option...] turn on listings\n\
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Sub-options [default hls]:\n\
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d omit debugging directives\n\
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h include high-level source\n\
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l include assembly\n\
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n omit forms processing\n\
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s include symbols\n\
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-D produce assembler debugging messages\n\
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-f skip whitespace and comment preprocessing\n\
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--help show this message and exit\n\
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-I DIR add DIR to search list for .include directives\n\
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-J don't warn about signed overflow\n\
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-K warn when differences altered for long displacements\n\
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-L keep local symbols (starting with `L')\n");
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fprintf (stream, "\
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-nocpp ignored\n\
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-o OBJFILE name the object-file output OBJFILE (default a.out)\n\
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-R fold data section into text section\n\
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--statistics print maximum bytes and total seconds used\n\
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--version print assembler version number and exit\n\
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-W suppress warnings\n\
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-w ignored\n\
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-X ignored\n\
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-Z generate object file even after errors\n");
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md_show_usage (stream);
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}
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/*
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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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* check for new machine-dep cmdline options in
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* md_parse_option definitions in config/tc-*.c
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*/
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void
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parse_args (pargc, pargv)
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int *pargc;
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char ***pargv;
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{
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int old_argc, new_argc;
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char **old_argv, **new_argv;
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/* Starting the short option string with '-' is for programs that
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expect options and other ARGV-elements in any order and that care about
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the ordering of the two. We describe each non-option ARGV-element
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as if it were the argument of an option with character code 1. */
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char *shortopts;
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extern CONST char *md_shortopts;
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/* -v takes an argument on VMS, so we don't make it a generic option.
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It gets recognized as an abbreviation of -version, anyway. */
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CONST char *std_shortopts = "-JKLRWZfa::DI:o:wX";
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struct option *longopts;
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extern struct option md_longopts[];
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extern size_t md_longopts_size;
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static struct option std_longopts[] = {
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#define OPTION_HELP (OPTION_STD_BASE)
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{"help", no_argument, NULL, OPTION_HELP},
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#define OPTION_NOCPP (OPTION_STD_BASE + 1)
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{"nocpp", no_argument, NULL, OPTION_NOCPP},
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#define OPTION_STATISTICS (OPTION_STD_BASE + 2)
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{"statistics", no_argument, NULL, OPTION_STATISTICS},
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#define OPTION_VERSION (OPTION_STD_BASE + 3)
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{"version", no_argument, NULL, OPTION_VERSION},
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};
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/* Construct the option lists from the standard list and the
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target dependent list. */
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shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
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longopts = xmalloc (sizeof (std_longopts) + md_longopts_size);
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memcpy (longopts, std_longopts, sizeof (std_longopts));
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memcpy ((char *) longopts + sizeof (std_longopts),
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md_longopts, md_longopts_size);
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/* Make a local copy of the old argv. */
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old_argc = *pargc;
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old_argv = *pargv;
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/* Initialize a new argv that contains no options. */
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new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
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new_argv[0] = old_argv[0];
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new_argc = 1;
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new_argv[new_argc] = NULL;
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while (1)
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{
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/* getopt_long_only is like getopt_long, but '-' as well as '--' can
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indicate a long option. */
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int longind;
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int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
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&longind);
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if (optc == -1)
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break;
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switch (optc)
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{
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default:
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/* md_parse_option should return 1 if it recognizes optc,
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0 if not. */
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if (md_parse_option (optc, optarg) == 0)
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exit (EXIT_FAILURE);
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break;
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case '?':
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exit (EXIT_FAILURE);
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case 1: /* File name. */
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if (!strcmp (optarg, "-"))
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optarg = "";
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new_argv[new_argc++] = optarg;
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new_argv[new_argc] = NULL;
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break;
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case OPTION_HELP:
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show_usage (stdout);
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exit (0);
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case OPTION_NOCPP:
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break;
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case OPTION_STATISTICS:
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statistics_flag = 1;
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break;
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case OPTION_VERSION:
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print_version_id ();
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exit (0);
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case 'J':
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flag_signed_overflow_ok = 1;
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break;
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case 'K':
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flag_warn_displacement = 1;
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break;
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case 'L':
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flag_keep_locals = 1;
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break;
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case 'R':
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flag_readonly_data_in_text = 1;
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break;
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case 'W':
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flag_no_warnings = 1;
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break;
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case 'Z':
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flag_always_generate_output = 1;
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break;
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case 'a':
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if (optarg)
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{
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while (*optarg)
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{
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switch (*optarg)
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{
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case 'd':
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listing |= LISTING_NODEBUG;
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break;
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case 'h':
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listing |= LISTING_HLL;
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break;
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case 'l':
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listing |= LISTING_LISTING;
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break;
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case 'n':
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listing |= LISTING_NOFORM;
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break;
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case 's':
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listing |= LISTING_SYMBOLS;
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break;
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default:
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as_bad ("invalid listing option `%c'", *optarg);
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exit (EXIT_FAILURE);
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break;
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}
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optarg++;
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}
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}
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if (!listing)
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listing = LISTING_DEFAULT;
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break;
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case 'D':
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/* DEBUG is implemented: it debugs different */
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/* things from other people's assemblers. */
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flag_debug = 1;
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break;
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case 'f':
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flag_no_comments = 1;
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break;
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case 'I':
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{ /* Include file directory */
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char *temp = strdup (optarg);
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if (!temp)
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as_fatal ("virtual memory exhausted");
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add_include_dir (temp);
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break;
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}
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case 'o':
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out_file_name = strdup (optarg);
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if (!out_file_name)
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as_fatal ("virtual memory exhausted");
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break;
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case 'w':
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break;
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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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}
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}
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free (shortopts);
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free (longopts);
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*pargc = new_argc;
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*pargv = new_argv;
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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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char a;
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int keep_it;
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long start_time = get_run_time ();
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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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#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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parse_args (&argc, &argv);
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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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#ifdef tc_init_after_args
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tc_init_after_args ();
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#endif
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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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keep_it = 1;
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else
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keep_it = 0;
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if (keep_it)
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write_object_file ();
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#ifndef NO_LISTING
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listing_print ("");
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#endif
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#ifndef OBJ_VMS /* does its own file handling */
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#ifndef BFD_ASSEMBLER
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if (keep_it)
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#endif
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output_file_close (out_file_name);
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#endif
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if (!keep_it)
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unlink (out_file_name);
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input_scrub_end ();
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#ifdef md_end
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md_end ();
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#endif
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if (statistics_flag)
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{
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extern char **environ;
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char *lim = (char *) sbrk (0);
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long run_time = get_run_time () - start_time;
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fprintf (stderr, "%s: total time in assembly: %ld.%06ld\n",
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myname, run_time / 1000000, run_time % 1000000);
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fprintf (stderr, "%s: data size %ld\n",
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myname, (long) (lim - (char *) &environ));
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}
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if ((had_warnings () && flag_always_generate_output)
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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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{
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segT seg;
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#ifdef TE_APOLLO
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seg = subseg_new (".wtext", 0);
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#else
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seg = subseg_new (".text", 0);
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#endif
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assert (seg == SEG_E0);
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seg = subseg_new (".data", 0);
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assert (seg == SEG_E1);
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seg = subseg_new (".bss", 0);
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assert (seg == SEG_E2);
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#ifdef TE_APOLLO
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create_target_segments ();
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#endif
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}
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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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#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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seg_info (bss_section)->bss = 1;
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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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reg_section = subseg_new ("*GAS `reg' section*", 0);
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expr_section = subseg_new ("*GAS `expr' section*", 0);
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#endif /* BFD_ASSEMBLER */
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subseg_set (text_section, 0);
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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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#if 0
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/* This is not currently used. */
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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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#endif
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/* end of as.c */
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