commands/go.c

   1 /*
   2  * go- execute some code anywhere (misc boot support)
   3  *
   4  * (C) Copyright 2000-2003
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <common.h>
  27 #include <command.h>
  28 #include <fs.h>
  29 #include <fcntl.h>
  30 #include <linux/ctype.h>
  31 #include <errno.h>
  32
  33 static int do_go(struct command *cmdtp, int argc, char *argv[])
  34 {
  35         void    *addr;
  36         int     rcode = 1;
  37         int     fd = -1;
  38         int     (*func)(int argc, char *argv[]);
  39
  40         if (argc < 2)
  41                 return COMMAND_ERROR_USAGE;
  42
  43         if (!isdigit(*argv[1])) {
  44                 fd = open(argv[1], O_RDONLY);
  45                 if (fd < 0) {
  46                         perror("open");
  47                         goto out;
  48                 }
  49
  50                 addr = memmap(fd, PROT_READ);
  51                 if (addr == (void *)-1) {
  52                         perror("memmap");
  53                         goto out;
  54                 }
  55         } else
  56                 addr = (void *)simple_strtoul(argv[1], NULL, 16);
  57
  58         printf("## Starting application at 0x%08lX ...\n", addr);
  59
  60         console_flush();
  61
  62         func = addr;
  63
  64         shutdown_barebox();
  65         func(argc - 1, &argv[1]);
  66
  67         /*
  68          * The application returned. Since we have shutdown barebox and
  69          * we know nothing about the state of the cpu/memory we can't
  70          * do anything here.
  71          */
  72         while (1);
  73 out:
  74         if (fd > 0)
  75                 close(fd);
  76
  77         return rcode;
  78 }
  79
  80 static const __maybe_unused char cmd_go_help[] =
  81 "Usage: go addr [arg ...]\n"
  82 "Start application at address 'addr' passing 'arg' as arguments.\n"
  83 "If addr does not start with a digit it is interpreted as a filename\n"
  84 "in which case the file is memmapped and executed\n";
  85
  86 BAREBOX_CMD_START(go)
  87         .cmd            = do_go,
  88         .usage          = "start application at address or file",
  89         BAREBOX_CMD_HELP(cmd_go_help)
  90 BAREBOX_CMD_END