mirror of https://github.com/acidanthera/audk.git
66 lines
2.0 KiB
ArmAsm
66 lines
2.0 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:
|
||
|
|
#
|
||
|
|
#------------------------------------------------------------------------------
|
||
|
|
|
||
|
.globl _InternalMemCopyMem
|
||
|
|
||
|
|
#------------------------------------------------------------------------------
|
||
|
|
# VOID *
|
||
|
|
# EFIAPI
|
||
|
|
# InternalMemCopyMem (
|
||
|
|
# IN VOID *Destination,
|
||
|
|
# IN VOID *Source,
|
||
|
|
# IN UINTN Count
|
||
|
|
# );
|
||
|
|
#------------------------------------------------------------------------------
|
||
|
|
_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(%esi, %edx), %eax # eax <- End of Source
|
||
|
|
cmpl %edi, %esi
|
||
|
|
jae L0
|
||
|
|
cmpl %edi, %eax
|
||
|
|
jae L_CopyBackward # Copy backward if overlapped
|
||
|
|
L0:
|
||
|
|
movl %edx, %ecx
|
||
|
|
andl $3, %edx
|
||
|
|
shrl $2, %ecx
|
||
|
|
rep
|
||
|
|
movsl # Copy as many Dwords as possible
|
||
|
|
jmp L_CopyBytes
|
||
|
|
L_CopyBackward:
|
||
|
|
movl %eax, %esi # esi <- End of Source
|
||
|
|
leal -1(%edi, %edx), %edi # edi <- End of Destination
|
||
|
|
std
|
||
|
|
L_CopyBytes:
|
||
|
|
movl %edx, %ecx
|
||
|
|
rep
|
||
|
|
movsb # Copy bytes backward
|
||
|
|
cld
|
||
|
|
movl 12(%esp), %eax # eax <- Destination as return value
|
||
|
|
pop %edi
|
||
|
|
pop %esi
|
||
|
|
ret
|