patch-2.1.16 linux/arch/sparc/mm/extable.c

• Lines: 71
• Date: Fri Dec 13 11:37:31 1996
• Orig file: v2.1.15/linux/arch/sparc/mm/extable.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.15/linux/arch/sparc/mm/extable.c linux/arch/sparc/mm/extable.c
@@ -0,0 +1,70 @@
+/*
+ * linux/arch/sparc/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;
+#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, g2);
+	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, g2);
+			if (ret)
+				return ret;
+		}
+	}
+#endif
+	return 0;
+}