source: bootcd/isolinux/syslinux-6.03/gpxe/src/hci/commands/gdbstub_cmd.c

/*
 * Copyright (C) 2008 Stefan Hajnoczi <stefanha@gmail.com>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <stdio.h>
#include <getopt.h>
#include <gpxe/command.h>
#include <gpxe/gdbstub.h>

/** @file
 *
 * GDB stub command
 *
 */

/**
 * "gdbstub" command syntax message
 *
 * @v argv              Argument list
 */
static void gdbstub_syntax ( char **argv ) {
        printf ( "Usage:\n"
                 "  %s <transport> [<options>...]\n"
                 "\n"
                 "Start remote debugging using one of the following transports:\n"
                 "  serial           use serial port (if compiled in)\n"
                 "  udp <interface>  use UDP over network interface (if compiled in)\n",
                 argv[0] );
}

/**
 * The "gdbstub" command
 *
 * @v argc              Argument count
 * @v argv              Argument list
 * @ret rc              Exit code
 */
static int gdbstub_exec ( int argc, char **argv ) {
        static struct option longopts[] = {
                { "help", 0, NULL, 'h' },
                { NULL, 0, NULL, 0 },
        };
        const char *trans_name;
        struct gdb_transport *trans;
        int c;

        /* Parse options */
        while ( ( c = getopt_long ( argc, argv, "h", longopts, NULL ) ) >= 0 ){
                switch ( c ) {
                case 'h':
                        /* Display help text */
                default:
                        /* Unrecognised/invalid option */
                        gdbstub_syntax ( argv );
                        return 1;
                }
        }

        /* At least one argument */
        if ( optind == argc ) {
                gdbstub_syntax ( argv );
                return 1;
        }

        trans_name = argv[optind++];

        /* Initialise transport */
        trans = find_gdb_transport ( trans_name );
        if ( !trans ) {
                printf ( "%s: no such transport (is it compiled in?)\n", trans_name );
                return 1;
        }

        if ( trans->init ) {
                if ( trans->init ( argc - optind, &argv[optind] ) != 0 ) {
                        return 1;
                }
        }

        /* Enter GDB stub */
        gdbstub_start ( trans );
        return 0;
}

/** GDB stub commands */
struct command gdbstub_commands[] __command = {
        {
                .name = "gdbstub",
                .exec = gdbstub_exec,
        },
};