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#include "defines.h"

#ifdef __H8300H__
        .h8300h
#endif

#ifdef __H8300S__
        .h8300s
#endif


        ; 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:   subs    #1,A1P          ; point to byte
        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