linux/arch/h8300/lib/strncpy.S
Yoshinori Sato a71a29de4c h8300: library functions
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
2015-06-23 13:35:54 +09:00

35 lines
430 B
ArmAsm

;;; strncpy.S
#include <asm/linkage.h>
.text
.global strncpy_from_user
;;; long strncpy_from_user(void *to, void *from, size_t n)
strncpy_from_user:
mov.l er2,er2
bne 1f
sub.l er0,er0
rts
1:
mov.l er4,@-sp
sub.l er3,er3
2:
mov.b @er1+,r4l
mov.b r4l,@er0
adds #1,er0
beq 3f
inc.l #1,er3
dec.l #1,er2
bne 2b
3:
dec.l #1,er2
4:
mov.b r4l,@er0
adds #1,er0
dec.l #1,er2
bne 4b
mov.l er3,er0
mov.l @sp+,er4
rts