diff options
| author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
|---|---|---|
| committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
| commit | e5fd91f1ef340da553f7a79da9540c3db711c937 (patch) | |
| tree | b11842027dc6641da63f4bcc524f8678263304a3 /arch/h8300/lib/memset.S | |
| parent | 2a9b0348e685a63d97486f6749622b61e9e3292f (diff) | |
Linux-libre 4.2-gnu
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 000000000..18d4e709b --- /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 |