[19605] | 1 | ; $Id: ASMAtomicCmpXchgU16.asm 98103 2023-01-17 14:15:46Z vboxsync $
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[19522] | 2 | ;; @file
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[59055] | 3 | ; IPRT - ASMAtomicCmpXchgU16().
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[19522] | 4 | ;
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| 5 |
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| 6 | ;
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[98103] | 7 | ; Copyright (C) 2006-2023 Oracle and/or its affiliates.
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[19522] | 8 | ;
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[96407] | 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.virtualbox.org.
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[19522] | 11 | ;
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[96407] | 12 | ; This program is free software; you can redistribute it and/or
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| 13 | ; modify it under the terms of the GNU General Public License
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| 14 | ; as published by the Free Software Foundation, in version 3 of the
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| 15 | ; License.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful, but
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| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | ; General Public License for more details.
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| 21 | ;
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| 22 | ; You should have received a copy of the GNU General Public License
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| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | ;
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[19522] | 25 | ; The contents of this file may alternatively be used under the terms
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| 26 | ; of the Common Development and Distribution License Version 1.0
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[96407] | 27 | ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | ; in the VirtualBox distribution, in which case the provisions of the
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[19522] | 29 | ; CDDL are applicable instead of those of the GPL.
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| 30 | ;
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| 31 | ; You may elect to license modified versions of this file under the
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| 32 | ; terms and conditions of either the GPL or the CDDL or both.
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| 33 | ;
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[96407] | 34 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | ;
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[19522] | 36 |
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| 37 | ;*******************************************************************************
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| 38 | ;* Header Files *
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| 39 | ;*******************************************************************************
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| 40 | %include "iprt/asmdefs.mac"
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| 41 |
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| 42 | BEGINCODE
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| 43 |
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| 44 | ;;
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[25490] | 45 | ; Atomically compares and exchanges an unsigned 8-bit int.
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[19522] | 46 | ;
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[59055] | 47 | ; @param pu16 x86:esp+4 msc:rcx gcc:rdi
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| 48 | ; @param u16New x86:esp+8 msc:dx gcc:si
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| 49 | ; @param u16Old x86:esp+c msc:r8l gcc:dl
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[19522] | 50 | ;
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[33540] | 51 | ; @returns bool result: true if successfully exchanged, false if not.
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[19605] | 52 | ; x86:al
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[19522] | 53 | ;
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[92799] | 54 | RT_BEGINPROC ASMAtomicCmpXchgU16
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[25490] | 55 | %ifdef RT_ARCH_AMD64
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| 56 | %ifdef ASM_CALL64_MSC
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[59055] | 57 | mov ax, r8w
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| 58 | lock cmpxchg [rcx], dx
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[25490] | 59 | %else
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[59055] | 60 | mov ax, dx
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| 61 | lock cmpxchg [rdi], si
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[25490] | 62 | %endif
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| 63 | %else
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| 64 | mov ecx, [esp + 04h]
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[59055] | 65 | mov dx, [esp + 08h]
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| 66 | mov ax, [esp + 0ch]
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| 67 | lock cmpxchg [ecx], dx
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[19522] | 68 | %endif
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| 69 | setz al
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| 70 | movzx eax, al
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| 71 | ret
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[59055] | 72 | ENDPROC ASMAtomicCmpXchgU16
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[19522] | 73 |
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