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

• Lines: 51
• Date: Thu Oct 31 13:59:59 1996
• Orig file: v2.1.6/linux/arch/alpha/mm/extable.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.6/linux/arch/alpha/mm/extable.c linux/arch/alpha/mm/extable.c
@@ -0,0 +1,50 @@
+/*
+ * linux/arch/alpha/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
+search_one_table(const struct exception_table_entry *first,
+		 const struct exception_table_entry *last,
+		 signed int value)
+{
+        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.unit;
+                else if (diff < 0)
+                        first = mid+1;
+                else
+                        last = mid-1;
+        }
+        return 0;
+}
+
+unsigned
+search_exception_table(unsigned long addr)
+{
+	unsigned ret;
+	signed int reladdr;
+
+	/* Search the kernel's table first.  */
+	{
+		register unsigned long gp __asm__("$29");
+		reladdr = addr - gp;
+	}
+	ret = search_one_table(__start___ex_table,
+			       __stop___ex_table-1, reladdr);
+	if (ret)
+		return ret;
+
+	/* FIXME -- search the module's tables here */
+
+	return 0;
+}