; $Id: ASMSerializeInstruction-iret.asm 92799 2021-12-08 00:47:27Z vboxsync $
;; @file
; IPRT - ASMSerializeInstruction() using iret.
;

;
; Copyright (C) 2006-2020 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


;;
; Executes a serializing instruction.
;
; The IRET instruction is rather expensive, but unlike the CPUID instruction it
; will not result in a VM EXIT when running in a virtual machine.
;
RT_BEGINPROC ASMSerializeInstructionIRet
        pop     xAX
%ifdef RT_ARCH_AMD64
        mov     rdx, xSP
        mov     ecx, ss
        push    rcx
        push    rdx
        pushfq
        mov     ecx, cs
        push    rcx
        push    rax
        iretq
%elifdef RT_ARCH_X86
        pushf
        push    cs
        push    xAX
        iret
%endif
ENDPROC            ASMSerializeInstructionIRet

