24 lines
679 B
ArmAsm
Executable file
24 lines
679 B
ArmAsm
Executable file
! memcpy() Author: Kees J. Bot
|
|
! 27 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
|
|
_memcpy:
|
|
push bp
|
|
mov bp, sp
|
|
push si
|
|
push di
|
|
mov di, 4(bp) ! String s1
|
|
mov si, 6(bp) ! String s2
|
|
mov cx, 8(bp) ! Length
|
|
! No overlap check here
|
|
jmp __memcpy ! Call the part of __memmove that copies up
|