Import of Linux/MIPS 2.1.14

1 files changed, 57 insertions, 0 deletions

diff --git a/arch/mips/mm/extable.c b/arch/mips/mm/extable.c
new file mode 100644
index 000000000..c46568ab1
--- /dev/null
+++ b/arch/mips/mm/extable.c
@@ -0,0 +1,57 @@
+/*
+ * linux/arch/mips/mm/extable.c
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#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,
+                 unsigned long 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->nextinsn;
+		else if (diff < 0)
+			first = mid+1;
+		else
+			last = mid-1;
+	}
+	return 0;
+}
+
+unsigned long search_exception_table(unsigned long addr)
+{
+	unsigned ret;
+#ifdef CONFIG_MODULES
+	struct module *mp;
+#endif
+
+	/* Search the kernel's table first.  */
+	ret = search_one_table(__start___ex_table,
+	                       __stop___ex_table-1, addr);
+	if (ret)
+		return ret;
+
+#ifdef CONFIG_MODULES
+	for (mp = module_list; mp != NULL; mp = mp->next) {
+		if (mp->exceptinfo.start != NULL) {
+			ret = search_one_table(mp->exceptinfo.start,
+			                       mp->exceptinfo.stop-1, addr);
+			if (ret)
+				return ret;
+		}
+	}
+#endif
+
+	return 0;
+}