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/util/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 static 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_reboot (void)
  73 {
  74   longjmp (main_env, 1);
  75 }
  76
  77 void
  78 grub_halt (
  79 #ifdef GRUB_MACHINE_PCBIOS
  80            int no_apm __attribute__ ((unused))
  81 #endif
  82            )
  83 {
  84   grub_reboot ();
  85 }
  86
  87 void
  88 grub_machine_init (void)
  89 {
  90 }
  91
  92 void
  93 grub_machine_set_prefix (void)
  94 {
  95   grub_env_set ("prefix", prefix);
  96   free (prefix);
  97   prefix = 0;
  98 }
  99
 100 void
 101 grub_machine_fini (void)
 102 {
 103   grub_console_fini ();
 104 }
 105
 106 void
 107 read_command_list (void)
 108 {
 109 }
 110 \f
 111
 112 static struct option options[] =
 113   {
 114     {"root-device", required_argument, 0, 'r'},
 115     {"device-map", required_argument, 0, 'm'},
 116     {"directory", required_argument, 0, 'd'},
 117     {"hold", optional_argument, 0, 'H'},
 118     {"help", no_argument, 0, 'h'},
 119     {"version", no_argument, 0, 'V'},
 120     {"verbose", no_argument, 0, 'v'},
 121     { 0, 0, 0, 0 }
 122   };
 123
 124 static int
 125 usage (int status)
 126 {
 127   if (status)
 128     fprintf (stderr,
 129              "Try ``grub-emu --help'' for more information.\n");
 130   else
 131     printf (
 132       "Usage: grub-emu [OPTION]...\n"
 133       "\n"
 134       "GRUB emulator.\n"
 135       "\n"
 136       "  -r, --root-device=DEV     use DEV as the root device [default=guessed]\n"
 137       "  -m, --device-map=FILE     use FILE as the device map [default=%s]\n"
 138       "  -d, --directory=DIR       use GRUB files in the directory DIR [default=%s]\n"
 139       "  -v, --verbose             print verbose messages\n"
 140       "  -H, --hold[=SECONDS]      wait until a debugger will attach\n"
 141       "  -h, --help                display this message and exit\n"
 142       "  -V, --version             print version information and exit\n"
 143       "\n"
 144       "Report bugs to <%s>.\n", DEFAULT_DEVICE_MAP, DEFAULT_DIRECTORY, PACKAGE_BUGREPORT);
 145   return status;
 146 }
 147 \f
 148
 149 int
 150 main (int argc, char *argv[])
 151 {
 152   char *root_dev = 0;
 153   char *dir = DEFAULT_DIRECTORY;
 154   char *dev_map = DEFAULT_DEVICE_MAP;
 155   volatile int hold = 0;
 156   int opt;
 157
 158   progname = "grub-emu";
 159
 160   while ((opt = getopt_long (argc, argv, "r:d:m:vH:hV", options, 0)) != -1)
 161     switch (opt)
 162       {
 163       case 'r':
 164         root_dev = optarg;
 165         break;
 166       case 'd':
 167         dir = optarg;
 168         break;
 169       case 'm':
 170         dev_map = optarg;
 171         break;
 172       case 'v':
 173         verbosity++;
 174         break;
 175       case 'H':
 176         hold = (optarg ? atoi (optarg) : -1);
 177         break;
 178       case 'h':
 179         return usage (0);
 180       case 'V':
 181         printf ("%s (%s) %s\n", progname, PACKAGE_NAME, PACKAGE_VERSION);
 182         return 0;
 183       default:
 184         return usage (1);
 185       }
 186
 187   if (optind < argc)
 188     {
 189       fprintf (stderr, "Unknown extra argument `%s'.\n", argv[optind]);
 190       return usage (1);
 191     }
 192
 193   /* Wait until the ARGS.HOLD variable is cleared by an attached debugger. */
 194   if (hold && verbosity > 0)
 195     printf ("Run \"gdb %s %d\", and set ARGS.HOLD to zero.\n",
 196             progname, (int) getpid ());
 197   while (hold)
 198     {
 199       if (hold > 0)
 200         hold--;
 201
 202       sleep (1);
 203     }
 204
 205   signal (SIGINT, SIG_IGN);
 206   grub_console_init ();
 207
 208   /* XXX: This is a bit unportable.  */
 209   grub_util_biosdisk_init (dev_map);
 210
 211   grub_init_all ();
 212
 213   /* Make sure that there is a root device.  */
 214   if (! root_dev)
 215     {
 216       char *device_name = grub_guess_root_device (dir);
 217       if (! device_name)
 218         grub_util_error ("cannot find a device for %s.\n", dir);
 219
 220       root_dev = grub_util_get_grub_dev (device_name);
 221       if (! root_dev)
 222         {
 223           grub_util_info ("guessing the root device failed, because of `%s'",
 224                           grub_errmsg);
 225           grub_util_error ("Cannot guess the root device. Specify the option ``--root-device''.");
 226         }
 227     }
 228
 229   dir = grub_get_prefix (dir);
 230   prefix = xmalloc (strlen (root_dev) + 2 + strlen (dir) + 1);
 231   sprintf (prefix, "(%s)%s", root_dev, dir);
 232   free (dir);
 233
 234   /* Start GRUB!  */
 235   if (setjmp (main_env) == 0)
 236     grub_main ();
 237
 238   grub_fini_all ();
 239
 240   grub_machine_fini ();
 241
 242   return 0;
 243 }