Renamed remotely
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6016 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
@@ -0,0 +1,73 @@
|
||||
;------------------------------------------------------------------------------
|
||||
;
|
||||
; Copyright (c) 2007, Intel Corporation
|
||||
; All rights reserved. This program and the accompanying materials
|
||||
; are licensed and made available under the terms and conditions of the BSD License
|
||||
; which accompanies this distribution. The full text of the license may be found at
|
||||
; http://opensource.org/licenses/bsd-license.php
|
||||
;
|
||||
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
||||
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
||||
;
|
||||
; Module Name:
|
||||
;
|
||||
; CopyMem.asm
|
||||
;
|
||||
; Abstract:
|
||||
;
|
||||
; memcpy function
|
||||
;
|
||||
; Notes:
|
||||
;
|
||||
;------------------------------------------------------------------------------
|
||||
|
||||
.code
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
; VOID *
|
||||
; memcpy (
|
||||
; OUT VOID *DestinationBuffer,
|
||||
; IN CONST VOID *SourceBuffer,
|
||||
; IN UINTN Length
|
||||
; );
|
||||
;------------------------------------------------------------------------------
|
||||
memcpy PROC USES rsi rdi
|
||||
mov rax, rcx ; rax <- Destination as return value
|
||||
cmp rdx, rcx ; if Source == Destination, do nothing
|
||||
je @CopyMemDone
|
||||
cmp r8, 0 ; if Count == 0, do nothing
|
||||
je @CopyMemDone
|
||||
mov rsi, rdx ; rsi <- Source
|
||||
mov rdi, rcx ; rdi <- Destination
|
||||
lea r9, [rsi + r8 - 1] ; r9 <- End of Source
|
||||
cmp rsi, rdi
|
||||
jae @F
|
||||
cmp r9, rdi
|
||||
jae @CopyBackward ; Copy backward if overlapped
|
||||
@@:
|
||||
mov rcx, r8
|
||||
and r8, 7
|
||||
shr rcx, 3 ; rcx <- # of Qwords to copy
|
||||
jz @CopyBytes
|
||||
DB 49h, 0fh, 7eh, 0c2h ; movd r10, mm0 (Save mm0 in r10)
|
||||
@@:
|
||||
DB 0fh, 6fh, 06h ; movd mm0, [rsi]
|
||||
DB 48h, 0fh, 7eh, 07h ; movd [rdi], mm0
|
||||
add rsi, 8
|
||||
add rdi, 8
|
||||
loop @B
|
||||
DB 49h, 0fh, 6eh, 0c2h ; movd mm0, r10 (Restore mm0)
|
||||
jmp @CopyBytes
|
||||
@CopyBackward:
|
||||
mov rsi, r9 ; rsi <- End of Source
|
||||
lea rdi, [rdi + r8 - 1] ; rdi <- End of Destination
|
||||
std ; set direction flag
|
||||
@CopyBytes:
|
||||
mov rcx, r8
|
||||
rep movsb ; Copy bytes backward
|
||||
cld
|
||||
@CopyMemDone:
|
||||
ret
|
||||
memcpy ENDP
|
||||
|
||||
END
|
Reference in New Issue
Block a user