nios2: Traps exception handling

This patch contains traps exception handling.

Signed-off-by: Ley Foon Tan <lftan@altera.com>
diff --git a/arch/nios2/include/asm/traps.h b/arch/nios2/include/asm/traps.h
new file mode 100644
index 0000000..82a4847
--- /dev/null
+++ b/arch/nios2/include/asm/traps.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2004 Microtronix Datacom Ltd.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_NIOS2_TRAPS_H
+#define _ASM_NIOS2_TRAPS_H
+
+#define TRAP_ID_SYSCALL		0
+
+#ifndef __ASSEMBLY__
+void _exception(int signo, struct pt_regs *regs, int code, unsigned long addr);
+#endif
+
+#endif /* _ASM_NIOS2_TRAPS_H */