VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/asm/ASMAtomicReadU64.asm@ 103795

Last change on this file since 103795 was 98103, checked in by vboxsync, 2 years ago

Copyright year updates by scm.

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File size: 2.3 KB
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1; $Id: ASMAtomicReadU64.asm 98103 2023-01-17 14:15:46Z vboxsync $
2;; @file
3; IPRT - ASMAtomicReadU64().
4;
5
6;
7; Copyright (C) 2006-2023 Oracle and/or its affiliates.
8;
9; This file is part of VirtualBox base platform packages, as
10; available from https://www.virtualbox.org.
11;
12; This program is free software; you can redistribute it and/or
13; modify it under the terms of the GNU General Public License
14; as published by the Free Software Foundation, in version 3 of the
15; License.
16;
17; This program is distributed in the hope that it will be useful, but
18; WITHOUT ANY WARRANTY; without even the implied warranty of
19; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20; General Public License for more details.
21;
22; You should have received a copy of the GNU General Public License
23; along with this program; if not, see <https://www.gnu.org/licenses>.
24;
25; The contents of this file may alternatively be used under the terms
26; of the Common Development and Distribution License Version 1.0
27; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28; in the VirtualBox distribution, in which case the provisions of the
29; CDDL are applicable instead of those of the GPL.
30;
31; You may elect to license modified versions of this file under the
32; terms and conditions of either the GPL or the CDDL or both.
33;
34; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35;
36
37;*******************************************************************************
38;* Header Files *
39;*******************************************************************************
40%include "iprt/asmdefs.mac"
41
42BEGINCODE
43
44;;
45; Atomically reads 64-bit value.
46;
47; @param pu64 x86:ebp+8
48;
49; @returns The current value. (x86:eax+edx)
50;
51;
52RT_BEGINPROC ASMAtomicReadU64
53%ifdef RT_ARCH_AMD64
54 mfence ; ASSUME its present.
55 %ifdef ASM_CALL64_MSC
56 mov rax, [rcx]
57 %else
58 mov rax, [rdi]
59 %endif
60 ret
61%endif
62%ifdef RT_ARCH_X86
63 push ebp
64 mov ebp, esp
65 push ebx
66 push edi
67
68 xor eax, eax
69 xor edx, edx
70 mov edi, [ebp+08h]
71 xor ecx, ecx
72 xor ebx, ebx
73 lock cmpxchg8b [edi]
74
75 pop edi
76 pop ebx
77 leave
78 ret
79%endif
80ENDPROC ASMAtomicReadU64
81
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