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source: vbox/trunk/src/VBox/Runtime/common/asm/ASMAtomicCmpXchgU8.asm@ 103795

Last change on this file since 103795 was 98103, checked in by vboxsync, 23 months ago

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1; $Id: ASMAtomicCmpXchgU8.asm 98103 2023-01-17 14:15:46Z vboxsync $
2;; @file
3; IPRT - ASMAtomicCmpXchgU8().
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 compares and exchanges an unsigned 8-bit int.
46;
47; @param pu8 x86:esp+4 msc:rcx gcc:rdi
48; @param u8New x86:esp+8 msc:dl gcc:sil
49; @param u8Old x86:esp+c msc:r8l gcc:dl
50;
51; @returns bool result: true if successfully exchanged, false if not.
52; x86:al
53;
54RT_BEGINPROC ASMAtomicCmpXchgU8
55%ifdef RT_ARCH_AMD64
56 %ifdef ASM_CALL64_MSC
57 mov al, r8b
58 lock cmpxchg [rcx], dl
59 %else
60 mov al, dl
61 lock cmpxchg [rdi], sil
62 %endif
63%else
64 mov ecx, [esp + 04h]
65 mov dl, [esp + 08h]
66 mov al, [esp + 0ch]
67 lock cmpxchg [ecx], dl
68%endif
69 setz al
70 movzx eax, al
71 ret
72ENDPROC ASMAtomicCmpXchgU8
73
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