arch/common/boot/grub2/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/biosdisk.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   signal (SIGINT, SIG_IGN);
  75   grub_console_init ();
  76 }
  77
  78 void
  79 grub_machine_set_prefix (void)
  80 {
  81   grub_env_set ("prefix", prefix);
  82   free (prefix);
  83   prefix = 0;
  84 }
  85
  86 void
  87 grub_machine_fini (void)
  88 {
  89   grub_console_fini ();
  90 }
  91 \f
  92
  93 static struct option options[] =
  94   {
  95     {"root-device", required_argument, 0, 'r'},
  96     {"device-map", required_argument, 0, 'm'},
  97     {"directory", required_argument, 0, 'd'},
  98     {"hold", optional_argument, 0, 'H'},
  99     {"help", no_argument, 0, 'h'},
 100     {"version", no_argument, 0, 'V'},
 101     {"verbose", no_argument, 0, 'v'},
 102     { 0, 0, 0, 0 }
 103   };
 104
 105 static int
 106 usage (int status)
 107 {
 108   if (status)
 109     fprintf (stderr,
 110              "Try ``grub-emu --help'' for more information.\n");
 111   else
 112     printf (
 113       "Usage: grub-emu [OPTION]...\n"
 114       "\n"
 115       "GRUB emulator.\n"
 116       "\n"
 117       "  -r, --root-device=DEV     use DEV as the root device [default=guessed]\n"
 118       "  -m, --device-map=FILE     use FILE as the device map [default=%s]\n"
 119       "  -d, --directory=DIR       use GRUB files in the directory DIR [default=%s]\n"
 120       "  -v, --verbose             print verbose messages\n"
 121       "  -H, --hold[=SECONDS]      wait until a debugger will attach\n"
 122       "  -h, --help                display this message and exit\n"
 123       "  -V, --version             print version information and exit\n"
 124       "\n"
 125       "Report bugs to <%s>.\n", DEFAULT_DEVICE_MAP, DEFAULT_DIRECTORY, PACKAGE_BUGREPORT);
 126   return status;
 127 }
 128 \f
 129
 130 int
 131 main (int argc, char *argv[])
 132 {
 133   char *root_dev = 0;
 134   char *dir = DEFAULT_DIRECTORY;
 135   char *dev_map = DEFAULT_DEVICE_MAP;
 136   volatile int hold = 0;
 137   int opt;
 138
 139   progname = "grub-emu";
 140
 141   while ((opt = getopt_long (argc, argv, "r:d:m:vH:hV", options, 0)) != -1)
 142     switch (opt)
 143       {
 144       case 'r':
 145         root_dev = optarg;
 146         break;
 147       case 'd':
 148         dir = optarg;
 149         break;
 150       case 'm':
 151         dev_map = optarg;
 152         break;
 153       case 'v':
 154         verbosity++;
 155         break;
 156       case 'H':
 157         hold = (optarg ? atoi (optarg) : -1);
 158         break;
 159       case 'h':
 160         return usage (0);
 161       case 'V':
 162         printf ("%s (%s) %s\n", progname, PACKAGE_NAME, PACKAGE_VERSION);
 163         return 0;
 164       default:
 165         return usage (1);
 166       }
 167
 168   if (optind < argc)
 169     {
 170       fprintf (stderr, "Unknown extra argument `%s'.\n", argv[optind]);
 171       return usage (1);
 172     }
 173
 174   /* Wait until the ARGS.HOLD variable is cleared by an attached debugger. */
 175   if (hold && verbosity > 0)
 176     printf ("Run \"gdb %s %d\", and set ARGS.HOLD to zero.\n",
 177             progname, (int) getpid ());
 178   while (hold)
 179     {
 180       if (hold > 0)
 181         hold--;
 182
 183       sleep (1);
 184     }
 185
 186   /* XXX: This is a bit unportable.  */
 187   grub_util_biosdisk_init (dev_map);
 188
 189   grub_hostfs_init ();
 190
 191   grub_init_all ();
 192
 193   /* Make sure that there is a root device.  */
 194   if (! root_dev)
 195     {
 196       char *device_name = grub_guess_root_device (dir);
 197       if (! device_name)
 198         grub_util_error ("cannot find a device for %s.\n", dir);
 199
 200       root_dev = grub_util_get_grub_dev (device_name);
 201       if (! root_dev)
 202         {
 203           grub_util_info ("guessing the root device failed, because of `%s'",
 204                           grub_errmsg);
 205           grub_util_error ("Cannot guess the root device. Specify the option ``--root-device''.");
 206         }
 207     }
 208
 209   dir = grub_get_prefix (dir);
 210   prefix = xmalloc (strlen (root_dev) + 2 + strlen (dir) + 1);
 211   sprintf (prefix, "(%s)%s", root_dev, dir);
 212   free (dir);
 213
 214   /* Start GRUB!  */
 215   if (setjmp (main_env) == 0)
 216     grub_main ();
 217
 218   grub_fini_all ();
 219
 220   grub_hostfs_fini ();
 221
 222   grub_machine_fini ();
 223
 224   return 0;
 225 }