1 files changed, 57 insertions, 0 deletions

diff --git a/arch/sh/lib/memset.S b/arch/sh/lib/memset.S
new file mode 100644
index 000000000000..95670090680e
--- /dev/null
+++ b/arch/sh/lib/memset.S
@@ -0,0 +1,57 @@
+/* $Id: memset.S,v 1.1 2000/04/14 16:49:01 mjd Exp $
+ *
+ * "memset" implementation of SuperH
+ *
+ * Copyright (C) 1999  Niibe Yutaka
+ *
+ */
+
+/*
+ *            void *memset(void *s, int c, size_t n);
+ */
+
+#include <linux/linkage.h>
+
+ENTRY(memset)
+        tst     r6,r6
+        bt/s    5f              ! if n=0, do nothing
+         add    r6,r4
+        mov     #12,r0
+        cmp/gt  r6,r0
+        bt/s    4f              ! if it's too small, set a byte at once
+         mov    r4,r0
+        and     #3,r0
+        cmp/eq  #0,r0
+        bt/s    2f              ! It's aligned
+         sub    r0,r6
+1:
+        dt      r0
+        bf/s    1b
+         mov.b  r5,@-r4
+2:                              ! make VVVV
+        swap.b  r5,r0           !   V0
+        or      r0,r5           !   VV
+        swap.w  r5,r0           ! VV00
+        or      r0,r5           ! VVVV
+        !
+        mov     r6,r0
+        shlr2   r0
+        shlr    r0              ! r0 = r6 >> 3
+3:
+        dt      r0
+        mov.l   r5,@-r4         ! set 8-byte at once
+        bf/s    3b
+         mov.l  r5,@-r4
+        !
+        mov     #7,r0
+        and     r0,r6
+        tst     r6,r6
+        bt      5f
+        ! fill bytes
+4:
+        dt      r6
+        bf/s    4b
+         mov.b  r5,@-r4
+5:
+        rts
+         mov    r4,r0