| 1 | ;; @file
|
|---|
| 2 | ; IPRT - ASMProbeReadByte().
|
|---|
| 3 | ;
|
|---|
| 4 |
|
|---|
| 5 | ;
|
|---|
| 6 | ; Copyright (C) 2006-2010 Oracle Corporation
|
|---|
| 7 | ;
|
|---|
| 8 | ; This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 9 | ; available from http://www.virtualbox.org. This file is free software;
|
|---|
| 10 | ; you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 11 | ; General Public License (GPL) as published by the Free Software
|
|---|
| 12 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 13 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 14 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 15 | ;
|
|---|
| 16 | ; The contents of this file may alternatively be used under the terms
|
|---|
| 17 | ; of the Common Development and Distribution License Version 1.0
|
|---|
| 18 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 19 | ; VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 20 | ; CDDL are applicable instead of those of the GPL.
|
|---|
| 21 | ;
|
|---|
| 22 | ; You may elect to license modified versions of this file under the
|
|---|
| 23 | ; terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 24 | ;
|
|---|
| 25 |
|
|---|
| 26 | ;*******************************************************************************
|
|---|
| 27 | ;* Header Files *
|
|---|
| 28 | ;*******************************************************************************
|
|---|
| 29 | %include "iprt/asmdefs.mac"
|
|---|
| 30 |
|
|---|
| 31 | BEGINCODE
|
|---|
| 32 |
|
|---|
| 33 | ;;
|
|---|
| 34 | ; Probes a byte pointer for read access.
|
|---|
| 35 | ;
|
|---|
| 36 | ; While the function will not fault if the byte is not read accessible,
|
|---|
| 37 | ; the idea is to do this in a safe place like before acquiring locks
|
|---|
| 38 | ; and such like.
|
|---|
| 39 | ;
|
|---|
| 40 | ; Also, this functions guarantees that an eager compiler is not going
|
|---|
| 41 | ; to optimize the probing away.
|
|---|
| 42 | ;
|
|---|
| 43 | ; @param rcx pvByte Pointer to the byte.
|
|---|
| 44 | BEGINPROC_EXPORTED ASMProbeReadByte
|
|---|
| 45 | mov al, [rcx]
|
|---|
| 46 | ret
|
|---|
| 47 | ENDPROC ASMProbeReadByte
|
|---|
| 48 |
|
|---|
