patch-2.1.12 linux/arch/m68k/mm/extable.c

• Lines: 58
• Date: Fri Nov 22 15:56:35 1996
• Orig file: v2.1.11/linux/arch/m68k/mm/extable.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.11/linux/arch/m68k/mm/extable.c linux/arch/m68k/mm/extable.c
@@ -0,0 +1,57 @@
+/*
+ * linux/arch/m68k/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 long
+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 = value - mid->insn;
+		if (diff >= 0 && diff <= 2)
+			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;
+#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;
+}