v4.19.13 snapshot.
diff --git a/arch/nds32/lib/memcpy.S b/arch/nds32/lib/memcpy.S
new file mode 100644
index 0000000..a2345ea
--- /dev/null
+++ b/arch/nds32/lib/memcpy.S
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+
+
+.macro lbi1 dst, addr, adj
+lbi.bi \dst, [\addr], \adj
+.endm
+
+.macro sbi1 src, addr, adj
+sbi.bi \src, [\addr], \adj
+.endm
+
+.macro lmw1 start_reg, addr, end_reg
+lmw.bim \start_reg, [\addr], \end_reg
+.endm
+
+.macro smw1 start_reg, addr, end_reg
+smw.bim \start_reg, [\addr], \end_reg
+.endm
+
+.text
+ENTRY(memcpy)
+ move $r5, $r0
+#include "copy_template.S"
+ move $r0, $r5
+ ret
+
+ENDPROC(memcpy)