| 1 | ; $Id: ASMAtomicReadU64.asm 28800 2010-04-27 08:22:32Z vboxsync $
|
|---|
| 2 | ;; @file
|
|---|
| 3 | ; IPRT - ASMAtomicReadU64().
|
|---|
| 4 | ;
|
|---|
| 5 |
|
|---|
| 6 | ;
|
|---|
| 7 | ; Copyright (C) 2006-2009 Oracle Corporation
|
|---|
| 8 | ;
|
|---|
| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | ; available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | ; General Public License (GPL) as published by the Free Software
|
|---|
| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | ;
|
|---|
| 17 | ; The contents of this file may alternatively be used under the terms
|
|---|
| 18 | ; of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | ; CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | ;
|
|---|
| 23 | ; You may elect to license modified versions of this file under the
|
|---|
| 24 | ; terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | ;
|
|---|
| 26 |
|
|---|
| 27 | ;*******************************************************************************
|
|---|
| 28 | ;* Header Files *
|
|---|
| 29 | ;*******************************************************************************
|
|---|
| 30 | %include "iprt/asmdefs.mac"
|
|---|
| 31 |
|
|---|
| 32 | BEGINCODE
|
|---|
| 33 |
|
|---|
| 34 | ;;
|
|---|
| 35 | ; Atomically reads 64-bit value.
|
|---|
| 36 | ;
|
|---|
| 37 | ; @param pu64 x86:ebp+8
|
|---|
| 38 | ;
|
|---|
| 39 | ; @returns The current value. (x86:eax+edx)
|
|---|
| 40 | ;
|
|---|
| 41 | ;
|
|---|
| 42 | BEGINPROC_EXPORTED ASMAtomicReadU64
|
|---|
| 43 | %ifdef RT_ARCH_AMD64
|
|---|
| 44 | mfence ; ASSUME its present.
|
|---|
| 45 | %ifdef ASM_CALL64_MSC
|
|---|
| 46 | mov rax, [rcx]
|
|---|
| 47 | %else
|
|---|
| 48 | mov rax, [rdi]
|
|---|
| 49 | %endif
|
|---|
| 50 | ret
|
|---|
| 51 | %endif
|
|---|
| 52 | %ifdef RT_ARCH_X86
|
|---|
| 53 | push ebp
|
|---|
| 54 | mov ebp, esp
|
|---|
| 55 | push ebx
|
|---|
| 56 | push edi
|
|---|
| 57 |
|
|---|
| 58 | xor eax, eax
|
|---|
| 59 | xor edx, edx
|
|---|
| 60 | mov edi, [ebp+08h]
|
|---|
| 61 | xor ecx, ecx
|
|---|
| 62 | xor ebx, ebx
|
|---|
| 63 | lock cmpxchg8b [edi]
|
|---|
| 64 |
|
|---|
| 65 | pop edi
|
|---|
| 66 | pop ebx
|
|---|
| 67 | leave
|
|---|
| 68 | ret
|
|---|
| 69 | %endif
|
|---|
| 70 | ENDPROC ASMAtomicReadU64
|
|---|
| 71 |
|
|---|
