diff --git a/kernel/extable.c b/kernel/extable.c
new file mode 100644
index 0000000..7501b53
--- /dev/null
+++ b/kernel/extable.c
@@ -0,0 +1,67 @@
+/* Rewritten by Rusty Russell, on the backs of many others...
+   Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
+
+    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+#include <linux/module.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/sections.h>
+
+extern struct exception_table_entry __start___ex_table[];
+extern struct exception_table_entry __stop___ex_table[];
+
+/* Sort the kernel's built-in exception table */
+void __init sort_main_extable(void)
+{
+	sort_extable(__start___ex_table, __stop___ex_table);
+}
+
+/* Given an address, look for it in the exception tables. */
+const struct exception_table_entry *search_exception_tables(unsigned long addr)
+{
+	const struct exception_table_entry *e;
+
+	e = search_extable(__start___ex_table, __stop___ex_table-1, addr);
+	if (!e)
+		e = search_module_extables(addr);
+	return e;
+}
+
+static int core_kernel_text(unsigned long addr)
+{
+	if (addr >= (unsigned long)_stext &&
+	    addr <= (unsigned long)_etext)
+		return 1;
+
+	if (addr >= (unsigned long)_sinittext &&
+	    addr <= (unsigned long)_einittext)
+		return 1;
+	return 0;
+}
+
+int __kernel_text_address(unsigned long addr)
+{
+	if (core_kernel_text(addr))
+		return 1;
+	return __module_text_address(addr) != NULL;
+}
+
+int kernel_text_address(unsigned long addr)
+{
+	if (core_kernel_text(addr))
+		return 1;
+	return module_text_address(addr) != NULL;
+}