mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 23:32:06 +00:00
31 lines
537 B
ArmAsm
31 lines
537 B
ArmAsm
|
#include "setarch.h"
|
||
|
|
|
||
|
|
#include "defines.h"
|
||
|
|
|
||
|
|
; dst A0
|
||
|
|
; src A1
|
||
|
|
; len A2
|
||
|
|
.global ___reg_memcpy
|
||
|
|
___reg_memcpy:
|
||
|
|
|
||
|
|
MOVP A0P,A3P ; keep copy of result
|
||
|
|
ADDP A2P,A0P ; point to end of dst
|
||
|
|
ADDP A2P,A1P ; point to end of src
|
||
|
|
CMPP A0P,A3P ; see if anything to do
|
||
|
|
beq quit
|
||
|
|
|
||
|
|
loop:
|
||
|
|
#ifdef __NORMAL_MODE__
|
||
|
|
sub #1,A1P ; point to byte
|
||
|
|
#else
|
||
|
|
subs #1,A1P ; point to byte
|
||
|
|
#endif
|
||
|
|
mov.b @A1P,A2L ; get byte
|
||
|
|
mov.b A2L,@-A0P ; save byte
|
||
|
|
CMPP A0P,A3P ; at the front again ?
|
||
|
|
bne loop
|
||
|
|
|
||
|
|
; return with A0 pointing to dst
|
||
|
|
quit: rts
|
||
|
|
|