diff options
| author | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-01-28 02:48:15 +0900 |
|---|---|---|
| committer | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-06-23 13:35:54 +0900 |
| commit | a71a29de4c2f95563220a472f265f0bd74701d52 (patch) | |
| tree | 2e0b84cdc079ce9dc038d7bf3f86ebdd0315cb2e /arch/h8300/lib/memset.S | |
| parent | bbeb79acb3b44f727f6267e1f6db9b3fdf791c24 (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.S | 69 |
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 |