minix/lib/i386/string/memcpy.s
2009-11-09 10:26:00 +00:00

24 lines
702 B
ArmAsm

! memcpy() Author: Kees J. Bot
! 2 Jan 1994
.sect .text; .sect .rom; .sect .data; .sect .bss
! void *memcpy(void *s1, const void *s2, size_t n)
! Copy a chunk of memory.
! This routine need not handle overlap, so it does not handle overlap.
! One could simply call __memmove, the cost of the overlap check is
! negligible, but you are dealing with a programmer who believes that
! if anything can go wrong, it should go wrong.
!
.sect .text
.define _memcpy
.align 16
_memcpy:
push ebp
mov ebp, esp
push esi
push edi
mov edi, 8(ebp) ! String s1
mov esi, 12(ebp) ! String s2
mov ecx, 16(ebp) ! Length
! No overlap check here
jmp __memcpy ! Call the part of __memmove that copies up