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-rw-r--r--arch/s390/lib/mem.S39
1 files changed, 39 insertions, 0 deletions
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
@@ -8,6 +8,45 @@
#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
*
* This code corresponds to the C construct below. We do distinguish

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