summaryrefslogtreecommitdiff
path: root/arch/h8300/lib/memset.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/h8300/lib/memset.S')
-rw-r--r--arch/h8300/lib/memset.S61
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/h8300/lib/memset.S b/arch/h8300/lib/memset.S
new file mode 100644
index 00000000000..59abdf9485a
--- /dev/null
+++ b/arch/h8300/lib/memset.S
@@ -0,0 +1,61 @@
+/* memset.S */
+
+#include <asm/linkage.h>
+
+#if defined(__H8300H__)
+ .h8300h
+#endif
+#if defined(__H8300S__)
+ .h8300s
+#endif
+ .text
+
+.global SYMBOL_NAME(memset)
+
+;;void *memset(*ptr, int c, size_t count)
+;; ptr = er0
+;; c = er1(r1l)
+;; count = er2
+SYMBOL_NAME_LABEL(memset)
+ btst #0,r0l
+ beq 2f
+
+ ;; odd address
+1:
+ mov.b r1l,@er0
+ adds #1,er0
+ dec.l #1,er2
+ beq 6f
+
+ ;; even address
+2:
+ mov.l er2,er3
+ cmp.l #4,er2
+ blo 4f
+ ;; count>=4 -> count/4
+#if defined(__H8300H__)
+ shlr.l er2
+ shlr.l er2
+#endif
+#if defined(__H8300S__)
+ shlr.l #2,er2
+#endif
+ ;; byte -> long
+ mov.b r1l,r1h
+ mov.w r1,e1
+3:
+ mov.l er1,@er0
+ adds #4,er0
+ dec.l #1,er2
+ bne 3b
+4:
+ ;; count % 4
+ and.b #3,r3l
+ beq 6f
+5:
+ mov.b r1l,@er0
+ adds #1,er0
+ dec.b r3l
+ bne 5b
+6:
+ rts