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; $Id: ASMAtomicXchgU64.asm $
;; @file
; IPRT - ASMAtomicXchgU64().
;
;
; 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
;;
; Atomically Exchange an unsigned 64-bit value, ordered.
;
; @param pu64 x86:ebp+8 gcc:rdi msc:rcx
; @param u64New x86:ebp+c gcc:rsi msc:rdx
;
; @returns Current (i.e. old) *pu64 value (x86:eax:edx, 64-bit: rax)
;
BEGINPROC_EXPORTED ASMAtomicXchgU64
%ifdef RT_ARCH_AMD64
%ifdef ASM_CALL64_MSC
xchg [rcx], rdx
%else
xchg [rdi], rsi
%endif
ret
%endif
%ifdef RT_ARCH_X86
push ebp
mov ebp, esp
push ebx
push edi
.try_again:
mov ebx, dword [ebp+0ch]
mov ecx, dword [ebp+0ch + 4]
mov edi, [ebp+08h]
lock cmpxchg8b [edi]
jnz .try_again
pop edi
pop ebx
leave
ret
%endif
ENDPROC ASMAtomicXchgU64
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