Prepend underscores to procedure identifiers.
[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibRepStr / Ia32 / CopyMem.s
1 #------------------------------------------------------------------------------
2 #
3 # Copyright (c) 2006, Intel Corporation
4 # All rights reserved. This program and the accompanying materials
5 # are licensed and made available under the terms and conditions of the BSD License
6 # which accompanies this distribution. The full text of the license may be found at
7 # http://opensource.org/licenses/bsd-license.php
8 #
9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11 #
12 # Module Name:
13 #
14 # CopyMem.Asm
15 #
16 # Abstract:
17 #
18 # CopyMem function
19 #
20 # Notes:
21 #
22 #------------------------------------------------------------------------------
23
24 .386:
25 .code:
26
27 .global _InternalMemCopyMem
28 _InternalMemCopyMem:
29 push %esi
30 push %edi
31 movl 16(%esp),%esi # esi <- Source
32 movl 12(%esp),%edi # edi <- Destination
33 movl 20(%esp),%edx # edx <- Count
34 leal -1(%edi,%edx),%eax # eax <- End of Destination
35 cmpl %edi,%esi
36 jae L0
37 cmpl %esi,%eax
38 jae @CopyBackward # Copy backward if overlapped
39 L0:
40 movl %edx,%ecx
41 andl $3,%edx
42 shrl $2,%ecx
43 rep
44 movsl # Copy as many Dwords as possible
45 jmp @CopyBytes
46 @CopyBackward:
47 movl %eax,%edi # edi <- End of Destination
48 leal -1(%esi,%edx),%esi # esi <- End of Source
49 std
50 @CopyBytes:
51 movl %edx,%ecx
52 rep
53 movsb # Copy bytes backward
54 cld
55 movl 12(%esp),%eax # eax <- Destination as return value
56 push %edi
57 push %esi
58 ret