VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/asm/ASMAtomicReadU64.asm@ 78381

Last change on this file since 78381 was 76553, checked in by vboxsync, 6 years ago

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File size: 2.0 KB
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1; $Id: ASMAtomicReadU64.asm 76553 2019-01-01 01:45:53Z vboxsync $
2;; @file
3; IPRT - ASMAtomicReadU64().
4;
5
6;
7; Copyright (C) 2006-2019 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27;*******************************************************************************
28;* Header Files *
29;*******************************************************************************
30%include "iprt/asmdefs.mac"
31
32BEGINCODE
33
34;;
35; Atomically reads 64-bit value.
36;
37; @param pu64 x86:ebp+8
38;
39; @returns The current value. (x86:eax+edx)
40;
41;
42BEGINPROC_EXPORTED ASMAtomicReadU64
43%ifdef RT_ARCH_AMD64
44 mfence ; ASSUME its present.
45 %ifdef ASM_CALL64_MSC
46 mov rax, [rcx]
47 %else
48 mov rax, [rdi]
49 %endif
50 ret
51%endif
52%ifdef RT_ARCH_X86
53 push ebp
54 mov ebp, esp
55 push ebx
56 push edi
57
58 xor eax, eax
59 xor edx, edx
60 mov edi, [ebp+08h]
61 xor ecx, ecx
62 xor ebx, ebx
63 lock cmpxchg8b [edi]
64
65 pop edi
66 pop ebx
67 leave
68 ret
69%endif
70ENDPROC ASMAtomicReadU64
71
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