util/grub-emu.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2003,2004,2005,2006,2007,2008  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stdlib.h>
  20 #include <sys/stat.h>
  21 #include <getopt.h>
  22 #include <string.h>
  23 #include <signal.h>
  24 #include <sys/types.h>
  25 #include <unistd.h>
  26
  27 #include <grub/mm.h>
  28 #include <grub/setjmp.h>
  29 #include <grub/fs.h>
  30 #include <grub/util/hostdisk.h>
  31 #include <grub/dl.h>
  32 #include <grub/machine/console.h>
  33 #include <grub/util/misc.h>
  34 #include <grub/kernel.h>
  35 #include <grub/normal.h>
  36 #include <grub/util/getroot.h>
  37 #include <grub/env.h>
  38 #include <grub/partition.h>
  39
  40 #include <grub_emu_init.h>
  41
  42 /* Used for going back to the main function.  */
  43 jmp_buf main_env;
  44
  45 /* Store the prefix specified by an argument.  */
  46 static char *prefix = 0;
  47
  48 grub_addr_t
  49 grub_arch_modules_addr (void)
  50 {
  51   return 0;
  52 }
  53
  54 grub_err_t
  55 grub_arch_dl_check_header (void *ehdr)
  56 {
  57   (void) ehdr;
  58
  59   return GRUB_ERR_BAD_MODULE;
  60 }
  61
  62 grub_err_t
  63 grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr)
  64 {
  65   (void) mod;
  66   (void) ehdr;
  67
  68   return GRUB_ERR_BAD_MODULE;
  69 }
  70
  71 void
  72 grub_machine_init (void)
  73 {
  74 }
  75
  76 void
  77 grub_machine_set_prefix (void)
  78 {
  79   grub_env_set ("prefix", prefix);
  80   free (prefix);
  81   prefix = 0;
  82 }
  83
  84 void
  85 grub_machine_fini (void)
  86 {
  87   grub_console_fini ();
  88 }
  89 \f
  90
  91 static struct option options[] =
  92   {
  93     {"root-device", required_argument, 0, 'r'},
  94     {"device-map", required_argument, 0, 'm'},
  95     {"directory", required_argument, 0, 'd'},
  96     {"hold", optional_argument, 0, 'H'},
  97     {"help", no_argument, 0, 'h'},
  98     {"version", no_argument, 0, 'V'},
  99     {"verbose", no_argument, 0, 'v'},
 100     { 0, 0, 0, 0 }
 101   };
 102
 103 static int
 104 usage (int status)
 105 {
 106   if (status)
 107     fprintf (stderr,
 108              "Try ``grub-emu --help'' for more information.\n");
 109   else
 110     printf (
 111       "Usage: grub-emu [OPTION]...\n"
 112       "\n"
 113       "GRUB emulator.\n"
 114       "\n"
 115       "  -r, --root-device=DEV     use DEV as the root device [default=guessed]\n"
 116       "  -m, --device-map=FILE     use FILE as the device map [default=%s]\n"
 117       "  -d, --directory=DIR       use GRUB files in the directory DIR [default=%s]\n"
 118       "  -v, --verbose             print verbose messages\n"
 119       "  -H, --hold[=SECONDS]      wait until a debugger will attach\n"
 120       "  -h, --help                display this message and exit\n"
 121       "  -V, --version             print version information and exit\n"
 122       "\n"
 123       "Report bugs to <%s>.\n", DEFAULT_DEVICE_MAP, DEFAULT_DIRECTORY, PACKAGE_BUGREPORT);
 124   return status;
 125 }
 126 \f
 127
 128 int
 129 main (int argc, char *argv[])
 130 {
 131   char *root_dev = 0;
 132   char *dir = DEFAULT_DIRECTORY;
 133   char *dev_map = DEFAULT_DEVICE_MAP;
 134   volatile int hold = 0;
 135   int opt;
 136
 137   progname = "grub-emu";
 138
 139   while ((opt = getopt_long (argc, argv, "r:d:m:vH:hV", options, 0)) != -1)
 140     switch (opt)
 141       {
 142       case 'r':
 143         root_dev = optarg;
 144         break;
 145       case 'd':
 146         dir = optarg;
 147         break;
 148       case 'm':
 149         dev_map = optarg;
 150         break;
 151       case 'v':
 152         verbosity++;
 153         break;
 154       case 'H':
 155         hold = (optarg ? atoi (optarg) : -1);
 156         break;
 157       case 'h':
 158         return usage (0);
 159       case 'V':
 160         printf ("%s (%s) %s\n", progname, PACKAGE_NAME, PACKAGE_VERSION);
 161         return 0;
 162       default:
 163         return usage (1);
 164       }
 165
 166   if (optind < argc)
 167     {
 168       fprintf (stderr, "Unknown extra argument `%s'.\n", argv[optind]);
 169       return usage (1);
 170     }
 171
 172   /* Wait until the ARGS.HOLD variable is cleared by an attached debugger. */
 173   if (hold && verbosity > 0)
 174     printf ("Run \"gdb %s %d\", and set ARGS.HOLD to zero.\n",
 175             progname, (int) getpid ());
 176   while (hold)
 177     {
 178       if (hold > 0)
 179         hold--;
 180
 181       sleep (1);
 182     }
 183
 184   signal (SIGINT, SIG_IGN);
 185   grub_console_init ();
 186
 187   /* XXX: This is a bit unportable.  */
 188   grub_util_biosdisk_init (dev_map);
 189
 190   grub_init_all ();
 191
 192   /* Make sure that there is a root device.  */
 193   if (! root_dev)
 194     {
 195       char *device_name = grub_guess_root_device (dir);
 196       if (! device_name)
 197         grub_util_error ("cannot find a device for %s.\n", dir);
 198
 199       root_dev = grub_util_get_grub_dev (device_name);
 200       if (! root_dev)
 201         {
 202           grub_util_info ("guessing the root device failed, because of `%s'",
 203                           grub_errmsg);
 204           grub_util_error ("Cannot guess the root device. Specify the option ``--root-device''.");
 205         }
 206     }
 207
 208   dir = grub_get_prefix (dir);
 209   prefix = xmalloc (strlen (root_dev) + 2 + strlen (dir) + 1);
 210   sprintf (prefix, "(%s)%s", root_dev, dir);
 211   free (dir);
 212
 213   /* Start GRUB!  */
 214   if (setjmp (main_env) == 0)
 215     grub_main ();
 216
 217   grub_fini_all ();
 218
 219   grub_machine_fini ();
 220
 221   return 0;
 222 }