| 1 | ; $Id: ASMAtomicCmpXchgU8.asm 82968 2020-02-04 10:35:17Z vboxsync $
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| 2 | ;; @file
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| 3 | ; IPRT - ASMAtomicCmpXchgU8().
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006-2020 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 | ;*******************************************************************************
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| 28 | ;* Header Files *
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| 29 | ;*******************************************************************************
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| 30 | %include "iprt/asmdefs.mac"
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| 31 |
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| 32 | BEGINCODE
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| 33 |
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| 34 | ;;
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| 35 | ; Atomically compares and exchanges an unsigned 8-bit int.
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| 36 | ;
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| 37 | ; @param pu8 x86:esp+4 msc:rcx gcc:rdi
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| 38 | ; @param u8New x86:esp+8 msc:dl gcc:sil
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| 39 | ; @param u8Old x86:esp+c msc:r8l gcc:dl
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| 40 | ;
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| 41 | ; @returns bool result: true if successfully exchanged, false if not.
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| 42 | ; x86:al
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| 43 | ;
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| 44 | BEGINPROC_EXPORTED ASMAtomicCmpXchgU8
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| 45 | %ifdef RT_ARCH_AMD64
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| 46 | %ifdef ASM_CALL64_MSC
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| 47 | mov al, r8b
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| 48 | lock cmpxchg [rcx], dl
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| 49 | %else
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| 50 | mov al, dl
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| 51 | lock cmpxchg [rdi], sil
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| 52 | %endif
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| 53 | %else
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| 54 | mov ecx, [esp + 04h]
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| 55 | mov dl, [esp + 08h]
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| 56 | mov al, [esp + 0ch]
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| 57 | lock cmpxchg [ecx], dl
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| 58 | %endif
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| 59 | setz al
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| 60 | movzx eax, al
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| 61 | ret
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| 62 | ENDPROC ASMAtomicCmpXchgU8
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| 63 |
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