1 files changed, 69 insertions, 0 deletions
diff --git a/arch/sparc64/mm/extable.c b/arch/sparc64/mm/extable.c
new file mode 100644
index 000000000..b2df0e169
--- /dev/null
+++ b/arch/sparc64/mm/extable.c
@@ -0,0 +1,69 @@
+/*
+ * linux/arch/sparc64/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 unsigned long
+search_one_table(const struct exception_table_entry *start,
+		 const struct exception_table_entry *last,
+		 unsigned long value, unsigned long *g2)
+{
+	const struct exception_table_entry *first = start;
+	const struct exception_table_entry *mid;
+	long diff = 0;
+        while (first <= last) {
+		mid = (last - first) / 2 + first;
+		diff = mid->insn - value;
+                if (diff == 0) {
+                	if (!mid->fixup) {
+                		*g2 = 0;
+                		return (mid + 1)->fixup;
+                	} else
+	                        return mid->fixup;
+                } else if (diff < 0)
+                        first = mid+1;
+                else
+                        last = mid-1;
+        }
+        if (last->insn < value && !last->fixup && last[1].insn > value) {
+        	*g2 = (value - last->insn)/4;
+        	return last[1].fixup;
+        }
+        if (first > start && first[-1].insn < value
+	    && !first[-1].fixup && first->insn < value) {
+        	*g2 = (value - first[-1].insn)/4;
+        	return first->fixup;
+        }
+        return 0;
+}
+
+unsigned long
+search_exception_table(unsigned long addr, unsigned long *g2)
+{
+	unsigned long ret;
+
+#ifndef CONFIG_MODULES
+	/* There is only the kernel to search.  */
+	ret = search_one_table(__start___ex_table,
+			       __stop___ex_table-1, addr, g2);
+	if (ret) return ret;
+#else
+	/* The kernel is the last "module" -- no need to treat it special.  */
+	struct module *mp;
+	for (mp = module_list; mp != NULL; mp = mp->next) {
+		if (mp->ex_table_start == NULL)
+			continue;
+		ret = search_one_table(mp->ex_table_start,
+				       mp->ex_table_end-1, addr, g2);
+		if (ret) return ret;
+	}
+#endif
+
+	return 0;
+}