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7b3b4b29 | 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 | ||
85c25283 | 24 | .globl ASM_PFX(InternalMemCopyMem) |
7b3b4b29 | 25 | |
26 | #------------------------------------------------------------------------------ | |
27 | # VOID * | |
28 | # EFIAPI | |
29 | # InternalMemCopyMem ( | |
30 | # IN VOID *Destination, | |
31 | # IN VOID *Source, | |
32 | # IN UINTN Count | |
33 | # ); | |
34 | #------------------------------------------------------------------------------ | |
85c25283 | 35 | ASM_PFX(InternalMemCopyMem): |
7b3b4b29 | 36 | push %esi |
37 | push %edi | |
38 | movl 16(%esp), %esi # esi <- Source | |
39 | movl 12(%esp), %edi # edi <- Destination | |
40 | movl 20(%esp), %edx # edx <- Count | |
85c25283 | 41 | cmpl %esi, %edi |
42 | je L_CopyDone | |
5053cf7f | 43 | cmpl $0, %edx |
85c25283 | 44 | je L_CopyDone |
7b3b4b29 | 45 | leal -1(%esi, %edx), %eax # eax <- End of Source |
85c25283 | 46 | cmpl %edi, %esi |
47 | jae L_CopyBytes | |
48 | cmpl %edi, %eax | |
49 | jb L_CopyBytes # Copy backward if overlapped | |
50 | movl %eax, %esi # esi <- End of Source | |
7b3b4b29 | 51 | leal -1(%edi, %edx), %edi # edi <- End of Destination |
85c25283 | 52 | std |
53 | L_CopyBytes: | |
54 | movl %edx, %ecx | |
7b3b4b29 | 55 | rep |
56 | movsb # Copy bytes backward | |
57 | cld | |
85c25283 | 58 | L_CopyDone: |
7b3b4b29 | 59 | movl 12(%esp), %eax # eax <- Destination as return value |
60 | pop %edi | |
61 | pop %esi | |
62 | ret |