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; $Id: ASMAtomicXchgU16.asm $
;; @file
; IPRT - ASMAtomicXchgU16().
;
;
; Copyright (C) 2006-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
;*******************************************************************************
;* Header Files *
;*******************************************************************************
%include "iprt/asmdefs.mac"
BEGINCODE
;;
; Atomically Exchange an unsigned 16-bit value, ordered.
;
; @param pu16 x86:ebp+8 gcc:rdi msc:rcx
; @param u16New x86:ebp+c gcc:si msc:dx
;
; @returns Current (i.e. old) *pu16 value (AX).
;
BEGINPROC_EXPORTED ASMAtomicXchgU16
%ifdef RT_ARCH_AMD64
%ifdef ASM_CALL64_MSC
mov ax, dx
xchg [rcx], ax
%else
mov ax, si
xchg [rdi], ax
%endif
%elifdef RT_ARCH_X86
mov ecx, [esp+04h]
mov ax, [esp+08h]
xchg [ecx], ax
%else
%error "Unsupport arch."
%endif
ret
ENDPROC ASMAtomicXchgU16
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