--- /dev/null
+/* mbchk - a simple checker for the format of a Multiboot kernel */
+/*
+ * Copyright (C) 1999,2001,2002 Free Software Foundation, Inc.
+ *
+ * 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
+ * (at your option) 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 <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <multiboot.h>
+
+static int quiet = 0;
+static char *optstring = "hvq";
+static struct option longopts[] =
+{
+ {"help", no_argument, 0, 'h'},
+ {"version", no_argument, 0, 'v'},
+ {"quiet", no_argument, 0, 'q'},
+ {0}
+};
+
+static void
+usage (int status)
+{
+ if (status)
+ fprintf (stderr, "Try ``mbchk --help'' for more information.\n");
+ else
+ printf ("Usage: mbchk [OPTION]... [FILE]...\n"
+ "Check if the format of FILE complies with the Multiboot Specification.\n"
+ "\n"
+ "-q, --quiet suppress all normal output\n"
+ "-h, --help display this help and exit\n"
+ "-v, --version output version information and exit.\n"
+ "\n"
+ "Report bugs to <bug-grub@gnu.org>.\n");
+
+ exit (status);
+}
+
+static int
+check_multiboot (const char *filename, FILE *fp)
+{
+ struct multiboot_header *mbh = 0;
+ int i;
+ char buf[8192];
+
+ if (fread (buf, 1, 8192, fp) < 0)
+ {
+ fprintf (stderr, "%s: Read error.\n", filename);
+ return 0;
+ }
+
+ for (i = 0; i < 8192 - sizeof (struct multiboot_header); i++)
+ {
+ mbh = (struct multiboot_header *) (buf + i);
+ if (mbh->magic == MULTIBOOT_HEADER_MAGIC)
+ break;
+ }
+
+ if (i == 8192 - sizeof (struct multiboot_header))
+ {
+ fprintf (stderr, "%s: No Multiboot header.\n", filename);
+ return 0;
+ }
+
+ if (! quiet)
+ printf ("%s: The Multiboot header is found at the offset %d.\n",
+ filename, i);
+
+ /* Check for the checksum. */
+ if (mbh->magic + mbh->flags + mbh->checksum != 0)
+ {
+ fprintf (stderr,
+ "%s: Bad checksum (0x%lx).\n",
+ filename, mbh->checksum);
+ return 0;
+ }
+
+ /* Reserved flags must be zero. */
+ if (mbh->flags & ~0x00010003)
+ {
+ fprintf (stderr,
+ "%s: Non-zero is found in reserved flags (0x%lx).\n",
+ filename, mbh->flags);
+ return 0;
+ }
+
+ if (! quiet)
+ {
+ printf ("%s: Page alignment is turned %s.\n",
+ filename, (mbh->flags & 0x1)? "on" : "off");
+ printf ("%s: Memory information is turned %s.\n",
+ filename, (mbh->flags & 0x2)? "on" : "off");
+ printf ("%s: Address fields is turned %s.\n",
+ filename, (mbh->flags & 0x10000)? "on" : "off");
+ }
+
+ /* Check for the address fields. */
+ if (mbh->flags & 0x10000)
+ {
+ if (mbh->header_addr < mbh->load_addr)
+ {
+ fprintf (stderr,
+ "%s: header_addr is less than "
+ "load_addr (0x%lx > 0x%lx).\n",
+ filename, mbh->header_addr, mbh->load_addr);
+ return 0;
+ }
+
+ if (mbh->load_end_addr && mbh->load_addr >= mbh->load_end_addr)
+ {
+ fprintf (stderr,
+ "%s: load_addr is not less than load_end_addr"
+ " (0x%lx >= 0x%lx).\n",
+ filename, mbh->load_addr, mbh->load_end_addr);
+ return 0;
+ }
+
+ if (mbh->bss_end_addr && mbh->load_end_addr > mbh->bss_end_addr)
+ {
+ fprintf (stderr,
+ "%s: load_end_addr is greater than bss_end_addr"
+ " (0x%lx > 0x%lx).\n",
+ filename, mbh->load_end_addr, mbh->bss_end_addr);
+ return 0;
+ }
+
+ if (mbh->load_addr > mbh->entry_addr)
+ {
+ fprintf (stderr,
+ "%s: load_addr is greater than entry_addr"
+ " (0x%lx > 0x%lx).\n",
+ filename, mbh->load_addr, mbh->entry_addr);
+ return 0;
+ }
+
+ /* FIXME: It is better to check if the entry address is within the
+ file, especially when the load end address is zero. */
+ if (mbh->load_end_addr && mbh->load_end_addr <= mbh->entry_addr)
+ {
+ fprintf (stderr,
+ "%s: load_end_addr is not greater than entry_addr"
+ " (0x%lx <= 0x%lx).\n",
+ filename, mbh->load_end_addr, mbh->entry_addr);
+ return 0;
+ }
+ }
+
+ if (! quiet)
+ printf ("%s: All checks passed.\n", filename);
+
+ return 1;
+}
+
+int
+main (int argc, char *argv[])
+{
+ int c;
+
+ do
+ {
+ c = getopt_long (argc, argv, optstring, longopts, 0);
+ switch (c)
+ {
+ case EOF:
+ break;
+
+ case 'h':
+ usage (0);
+ break;
+
+ case 'v':
+ printf ("mbchk (GNU GRUB " VERSION ")\n");
+ exit (0);
+ break;
+
+ case 'q':
+ quiet = 1;
+ break;
+
+ default:
+ usage (1);
+ break;
+ }
+ }
+ while (c != EOF);
+
+ if (optind < argc)
+ {
+ while (optind < argc)
+ {
+ FILE *fp;
+
+ fp = fopen (argv[optind], "r");
+ if (! fp)
+ {
+ fprintf (stderr, "%s: No such file.\n", argv[optind]);
+ exit (1);
+ }
+
+ if (! check_multiboot (argv[optind], fp))
+ exit (1);
+
+ fclose (fp);
+ optind++;
+ }
+ }
+ else
+ {
+ if (! check_multiboot ("<stdin>", stdin))
+ exit (1);
+ }
+
+ return 0;
+}
+
projects / thirdparty / grub.git / commitdiff
