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4df876ad | 1 | # |
2 | # ConvertAsm.py: Automatically generated from CopyMem.asm | |
3 | # | |
c5ecf6c1 | 4 | #------------------------------------------------------------------------------ |
5 | # | |
6 | # Copyright (c) 2006, Intel Corporation | |
7 | # All rights reserved. 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 | # | |
4df876ad | 17 | # CopyMem.S |
c5ecf6c1 | 18 | # |
19 | # Abstract: | |
20 | # | |
21 | # CopyMem function | |
22 | # | |
23 | # Notes: | |
24 | # | |
25 | #------------------------------------------------------------------------------ | |
26 | ||
27 | ||
28 | #------------------------------------------------------------------------------ | |
4df876ad | 29 | # VOID * |
30 | # EFIAPI | |
31 | # InternalMemCopyMem ( | |
32 | # IN VOID *Destination, | |
33 | # IN VOID *Source, | |
34 | # IN UINTN Count | |
35 | # ) | |
c5ecf6c1 | 36 | #------------------------------------------------------------------------------ |
4df876ad | 37 | .intel_syntax noprefix |
38 | .globl ASM_PFX(InternalMemCopyMem) | |
39 | ASM_PFX(InternalMemCopyMem): | |
40 | push rsi | |
41 | push rdi | |
42 | mov rsi, rdx # rsi <- Source | |
43 | mov rdi, rcx # rdi <- Destination | |
44 | lea r9, [rsi + r8 - 1] # r9 <- End of Source | |
45 | cmp rsi, rdi | |
46 | mov rax, rdi # rax <- Destination as return value | |
47 | jae _InternalMemCopyMem_al_0000 | |
48 | cmp r9, rdi | |
49 | jae _atSym_CopyBackward # Copy backward if overlapped | |
50 | _InternalMemCopyMem_al_0000: | |
51 | mov rcx, r8 | |
52 | and r8, 7 | |
53 | shr rcx, 3 | |
54 | rep movsq # Copy as many Qwords as possible | |
55 | jmp _atSym_CopyBytes | |
56 | _atSym_CopyBackward: | |
57 | mov rsi, r9 # rsi <- End of Source | |
58 | lea rdi, [rdi + r8 - 1] # esi <- End of Destination | |
c5ecf6c1 | 59 | std # set direction flag |
4df876ad | 60 | _atSym_CopyBytes: |
61 | mov rcx, r8 | |
62 | rep movsb # Copy bytes backward | |
c5ecf6c1 | 63 | cld |
4df876ad | 64 | pop rdi |
65 | pop rsi | |
c5ecf6c1 | 66 | ret |
4df876ad | 67 |