patch-2.1.7 linux/arch/i386/mm/extable.c

• Lines: 51
• Date: Fri Nov 1 11:56:43 1996
• Orig file: v2.1.6/linux/arch/i386/mm/extable.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.6/linux/arch/i386/mm/extable.c linux/arch/i386/mm/extable.c
@@ -0,0 +1,50 @@
+/*
+ * linux/arch/i386/mm/extable.c
+ */
+
+#include <asm/uaccess.h>
+
+extern const struct exception_table_entry __start___ex_table[];
+extern const struct exception_table_entry __stop___ex_table[];
+
+static inline unsigned long
+search_one_table(const struct exception_table_entry *first,
+		 const struct exception_table_entry *last,
+		 unsigned long value)
+{
+	/* Some versions of the linker are buggy and do not align the
+	   __start pointer along with the section, thus we may be low.  */
+	if ((long)first & 3)
+		(long)first = ((long)first | 3) + 1;
+
+        while (first <= last) {
+		const struct exception_table_entry *mid;
+		long diff;
+
+		mid = (last - first) / 2 + first;
+		diff = mid->insn - value;
+                if (diff == 0)
+                        return mid->fixup;
+                else if (diff < 0)
+                        first = mid+1;
+                else
+                        last = mid-1;
+        }
+        return 0;
+}
+
+unsigned long
+search_exception_table(unsigned long addr)
+{
+	unsigned long ret;
+
+	/* Search the kernel's table first.  */
+	ret = search_one_table(__start___ex_table,
+			       __stop___ex_table-1, addr);
+	if (ret)
+		return ret;
+
+	/* FIXME -- search the module's tables here */
+
+	return 0;
+}