summaryrefslogtreecommitdiff
path: root/arch/h8300/lib/memset.S
diff options
context:
space:
mode:
authorYoshinori Sato <ysato@users.sourceforge.jp>2015-01-28 02:48:15 +0900
committerYoshinori Sato <ysato@users.sourceforge.jp>2015-06-23 13:35:54 +0900
commita71a29de4c2f95563220a472f265f0bd74701d52 (patch)
tree2e0b84cdc079ce9dc038d7bf3f86ebdd0315cb2e /arch/h8300/lib/memset.S
parentbbeb79acb3b44f727f6267e1f6db9b3fdf791c24 (diff)
h8300: library functions
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Diffstat (limited to 'arch/h8300/lib/memset.S')
-rw-r--r--arch/h8300/lib/memset.S69
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/h8300/lib/memset.S b/arch/h8300/lib/memset.S
new file mode 100644
index 000000000000..18d4e709b5f4
--- /dev/null
+++ b/arch/h8300/lib/memset.S
@@ -0,0 +1,69 @@
+/* memset.S */
+
+#include <asm/linkage.h>
+
+#if defined(CONFIG_CPU_H8300H)
+ .h8300h
+#endif
+#if defined(CONFIG_CPU_H8S)
+ .h8300s
+#endif
+ .text
+
+.global memset
+.global clear_user
+
+;;void *memset(*ptr, int c, size_t count)
+;; ptr = er0
+;; c = er1(r1l)
+;; count = er2
+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(CONFIG_CPU_H8300H)
+ shlr.l er2
+ shlr.l er2
+#endif
+#if defined(CONFIG_CPU_H8S)
+ 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
+
+clear_user:
+ mov.l er1, er2
+ sub.l er1, er1
+ bra memset
+
+ .end