newlib-cygwin/newlib/libc/machine/h8300/reg_memcpy.S

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#include "setarch.h"
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#include "defines.h"
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; 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
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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