lib/i86/string/memcpy.s

   1 !       memcpy()                                        Author: Kees J. Bot
   2 !                                                               27 Jan 1994
   3 .sect .text; .sect .rom; .sect .data; .sect .bss
   4
   5 ! void *memcpy(void *s1, const void *s2, size_t n)
   6 !       Copy a chunk of memory.
   7 !       This routine need not handle overlap, so it does not handle overlap.
   8 !       One could simply call __memmove, the cost of the overlap check is
   9 !       negligible, but you are dealing with a programmer who believes that
  10 !       if anything can go wrong, it should go wrong.
  11 !
  12 .sect .text
  13 .define _memcpy
  14 _memcpy:
  15         push    bp
  16         mov     bp, sp
  17         push    si
  18         push    di
  19         mov     di, 4(bp)       ! String s1
  20         mov     si, 6(bp)       ! String s2
  21         mov     cx, 8(bp)       ! Length
  22         ! No overlap check here
  23         jmp     __memcpy        ! Call the part of __memmove that copies up