VirtualBox

source: vbox/trunk/src/VBox/Runtime/win/amd64/ASMAtomicXchgU8.asm@ 106061

Last change on this file since 106061 was 106061, checked in by vboxsync, 3 months ago

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Line 
1;; @file
2; IPRT - ASMAtomicXchgU8().
3;
4
5;
6; Copyright (C) 2006-2024 Oracle and/or its affiliates.
7;
8; This file is part of VirtualBox base platform packages, as
9; available from https://www.virtualbox.org.
10;
11; This program is free software; you can redistribute it and/or
12; modify it under the terms of the GNU General Public License
13; as published by the Free Software Foundation, in version 3 of the
14; License.
15;
16; This program is distributed in the hope that it will be useful, but
17; WITHOUT ANY WARRANTY; without even the implied warranty of
18; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19; General Public License for more details.
20;
21; You should have received a copy of the GNU General Public License
22; along with this program; if not, see <https://www.gnu.org/licenses>.
23;
24; The contents of this file may alternatively be used under the terms
25; of the Common Development and Distribution License Version 1.0
26; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
27; in the VirtualBox distribution, in which case the provisions of the
28; CDDL are applicable instead of those of the GPL.
29;
30; You may elect to license modified versions of this file under the
31; terms and conditions of either the GPL or the CDDL or both.
32;
33; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
34;
35
36;*******************************************************************************
37;* Header Files *
38;*******************************************************************************
39%include "iprt/asmdefs.mac"
40
41BEGINCODE
42
43;;
44; @returns al Current *pu8 value
45; @param rcx pu8 Pointer to the 8-bit variable to update.
46; @param dl u8 The 8-bit value to assign to *pu8.
47RT_BEGINPROC ASMAtomicXchgU8
48 xchg [rcx], dl
49 movzx eax, dl
50 ret
51ENDPROC ASMAtomicXchgU8
52
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