VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/asm/ASMAtomicXchgU64.asm@ 76452

Last change on this file since 76452 was 69111, checked in by vboxsync, 7 years ago

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1; $Id: ASMAtomicXchgU64.asm 69111 2017-10-17 14:26:02Z vboxsync $
2;; @file
3; IPRT - ASMAtomicXchgU64().
4;
5
6;
7; Copyright (C) 2006-2017 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 Exchange an unsigned 64-bit value, ordered.
36;
37; @param pu64 x86:ebp+8 gcc:rdi msc:rcx
38; @param u64New x86:ebp+c gcc:rsi msc:rdx
39;
40; @returns Current (i.e. old) *pu64 value (x86:eax:edx, 64-bit: rax)
41;
42BEGINPROC_EXPORTED ASMAtomicXchgU64
43%ifdef RT_ARCH_AMD64
44 %ifdef ASM_CALL64_MSC
45 xchg [rcx], rdx
46 %else
47 xchg [rdi], rsi
48 %endif
49 ret
50%endif
51%ifdef RT_ARCH_X86
52 push ebp
53 mov ebp, esp
54 push ebx
55 push edi
56
57.try_again:
58 mov ebx, dword [ebp+0ch]
59 mov ecx, dword [ebp+0ch + 4]
60 mov edi, [ebp+08h]
61 lock cmpxchg8b [edi]
62 jnz .try_again
63
64 pop edi
65 pop ebx
66 leave
67 ret
68%endif
69ENDPROC ASMAtomicXchgU64
70
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