diff --git a/arch/s390/include/asm/string.h b/arch/s390/include/asm/string.h
index 8662f5c8e17f..15a3c005c274 100644
--- a/arch/s390/include/asm/string.h
+++ b/arch/s390/include/asm/string.h
@@ -14,6 +14,7 @@
 #define __HAVE_ARCH_MEMCHR	/* inline & arch function */
 #define __HAVE_ARCH_MEMCMP	/* arch function */
 #define __HAVE_ARCH_MEMCPY	/* gcc builtin & arch function */
+#define __HAVE_ARCH_MEMMOVE	/* gcc builtin & arch function */
 #define __HAVE_ARCH_MEMSCAN	/* inline & arch function */
 #define __HAVE_ARCH_MEMSET	/* gcc builtin & arch function */
 #define __HAVE_ARCH_STRCAT	/* inline & arch function */
@@ -32,6 +33,7 @@
 extern int memcmp(const void *, const void *, size_t);
 extern void *memcpy(void *, const void *, size_t);
 extern void *memset(void *, int, size_t);
+extern void *memmove(void *, const void *, size_t);
 extern int strcmp(const char *,const char *);
 extern size_t strlcat(char *, const char *, size_t);
 extern size_t strlcpy(char *, const char *, size_t);
@@ -40,7 +42,6 @@ extern char *strncpy(char *, const char *, size_t);
 extern char *strrchr(const char *, int);
 extern char *strstr(const char *, const char *);
 
-#undef __HAVE_ARCH_MEMMOVE
 #undef __HAVE_ARCH_STRCHR
 #undef __HAVE_ARCH_STRNCHR
 #undef __HAVE_ARCH_STRNCMP
diff --git a/arch/s390/lib/mem.S b/arch/s390/lib/mem.S
index be9fa65bfac4..7422a706f310 100644
--- a/arch/s390/lib/mem.S
+++ b/arch/s390/lib/mem.S
@@ -7,6 +7,45 @@
 #include <linux/linkage.h>
 #include <asm/export.h>
 
+/*
+ * void *memmove(void *dest, const void *src, size_t n)
+ */
+ENTRY(memmove)
+	ltgr	%r4,%r4
+	lgr	%r1,%r2
+	bzr	%r14
+	clgr	%r2,%r3
+	jnh	.Lmemmove_forward
+	la	%r5,0(%r4,%r3)
+	clgr	%r2,%r5
+	jl	.Lmemmove_reverse
+.Lmemmove_forward:
+	aghi	%r4,-1
+	srlg	%r0,%r4,8
+	ltgr	%r0,%r0
+	jz	.Lmemmove_rest
+.Lmemmove_loop:
+	mvc	0(256,%r1),0(%r3)
+	la	%r1,256(%r1)
+	la	%r3,256(%r3)
+	brctg	%r0,.Lmemmove_loop
+.Lmemmove_rest:
+	larl	%r5,.Lmemmove_mvc
+	ex	%r4,0(%r5)
+	br	%r14
+.Lmemmove_reverse:
+	aghi	%r4,-1
+.Lmemmove_reverse_loop:
+	ic	%r0,0(%r4,%r3)
+	stc	%r0,0(%r4,%r1)
+	brctg	%r4,.Lmemmove_reverse_loop
+	ic	%r0,0(%r4,%r3)
+	stc	%r0,0(%r4,%r1)
+	br	%r14
+.Lmemmove_mvc:
+	mvc	0(1,%r1),0(%r3)
+EXPORT_SYMBOL(memmove)
+
 /*
  * memset implementation
  *