1#
2# ConvertAsm.py: Automatically generated from CopyMem.asm
3#
4#------------------------------------------------------------------------------
5#
6# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
7# This program and the accompanying materials
8# are licensed and made available under the terms and conditions of the BSD License
9# which accompanies this distribution.  The full text of the license may be found at
10# http://opensource.org/licenses/bsd-license.php.
11#
12# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14#
15# Module Name:
16#
17#   CopyMem.S
18#
19# Abstract:
20#
21#   CopyMem function
22#
23# Notes:
24#
25#------------------------------------------------------------------------------
26
27
28#------------------------------------------------------------------------------
29#  VOID *
30#  EFIAPI
31#  InternalMemCopyMem (
32#    IN VOID   *Destination,
33#    IN VOID   *Source,
34#    IN UINTN  Count
35#    )
36#------------------------------------------------------------------------------
37ASM_GLOBAL ASM_PFX(InternalMemCopyMem)
38ASM_PFX(InternalMemCopyMem):
39    pushq   %rsi
40    pushq   %rdi
41    movq    %rdx, %rsi                  # rsi <- Source
42    movq    %rcx, %rdi                  # rdi <- Destination
43    leaq    -1(%rsi, %r8,), %r9         # r9 <- End of Source
44    cmpq    %rdi, %rsi
45    movq    %rdi, %rax                  # rax <- Destination as return value
46    jae     L0
47    cmpq    %rdi, %r9
48    jae     L_CopyBackward               # Copy backward if overlapped
49L0:
50    movq    %r8, %rcx
51    andq    $7, %r8
52    shrq    $3, %rcx
53    rep     movsq                       # Copy as many Qwords as possible
54    jmp     L_CopyBytes
55L_CopyBackward:
56    movq    %r9, %rsi                   # rsi <- End of Source
57    leaq    -1(%rdi, %r8),  %rdi        # esi <- End of Destination
58    std                                 # set direction flag
59L_CopyBytes:
60    movq    %r8, %rcx
61    rep     movsb                       # Copy bytes backward
62    cld
63    popq    %rdi
64    popq    %rsi
65    ret
66
67