mirror of https://github.com/acidanthera/audk.git
59 lines
1.7 KiB
ArmAsm
59 lines
1.7 KiB
ArmAsm
#------------------------------------------------------------------------------
|
|
#
|
|
# Copyright (c) 2006, 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:
|
|
#
|
|
# CopyMem function
|
|
#
|
|
# Notes:
|
|
#
|
|
#------------------------------------------------------------------------------
|
|
|
|
.386:
|
|
.code:
|
|
|
|
.global _InternalMemCopyMem
|
|
_InternalMemCopyMem:
|
|
push %esi
|
|
push %edi
|
|
movl 16(%esp),%esi # esi <- Source
|
|
movl 12(%esp),%edi # edi <- Destination
|
|
movl 20(%esp),%edx # edx <- Count
|
|
leal -1(%edi,%edx),%eax # eax <- End of Destination
|
|
cmpl %edi,%esi
|
|
jae L0
|
|
cmpl %esi,%eax
|
|
jae @CopyBackward # Copy backward if overlapped
|
|
L0:
|
|
movl %edx,%ecx
|
|
andl $3,%edx
|
|
shrl $2,%ecx
|
|
rep
|
|
movsl # Copy as many Dwords as possible
|
|
jmp @CopyBytes
|
|
@CopyBackward:
|
|
movl %eax,%edi # edi <- End of Destination
|
|
leal -1(%esi,%edx),%esi # esi <- End of Source
|
|
std
|
|
@CopyBytes:
|
|
movl %edx,%ecx
|
|
rep
|
|
movsb # Copy bytes backward
|
|
cld
|
|
movl 12(%esp),%eax # eax <- Destination as return value
|
|
push %edi
|
|
push %esi
|
|
ret
|