124 lines
3.5 KiB
C++
124 lines
3.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2017 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the test suite of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef EMULATIONDETECTOR_H
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#define EMULATIONDETECTOR_H
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#include <QtCore/qglobal.h>
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#if defined(Q_OS_LINUX) && defined(Q_PROCESSOR_ARM)
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#define SHOULD_CHECK_ARM_ON_X86
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#include <QFileInfo>
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#if QT_CONFIG(process) && QT_CONFIG(regularexpression)
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#include <QProcess>
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#include <QRegularExpression>
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#endif
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#endif
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QT_BEGIN_NAMESPACE
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// Helper functions for detecting if running emulated
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namespace EmulationDetector {
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#ifdef SHOULD_CHECK_ARM_ON_X86
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static bool isX86SpecificFileAvailable(void);
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static bool isReportedArchitectureX86(void);
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#endif
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/*
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* Check if we are running Arm binary on x86 machine.
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*
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* Currently this is only able to check on Linux. If not able to
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* detect, return false.
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*/
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static Q_DECL_UNUSED bool isRunningArmOnX86()
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{
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#ifdef SHOULD_CHECK_ARM_ON_X86
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if (isX86SpecificFileAvailable())
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return true;
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if (isReportedArchitectureX86())
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return true;
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#endif
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return false;
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}
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#ifdef SHOULD_CHECK_ARM_ON_X86
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/*
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* Check if we can find a file that's only available on x86
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*/
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static bool isX86SpecificFileAvailable()
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{
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// MTRR (Memory Type Range Registers) are a feature of the x86 architecture
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// and /proc/mtrr is only present (on Linux) for that family.
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// However, it's an optional kernel feature, so the absence of the file is
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// not sufficient to conclude we're on real hardware.
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QFileInfo mtrr("/proc/mtrr");
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if (mtrr.exists())
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return true;
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return false;
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}
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/*
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* Check if architecture reported by the OS is x86
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*/
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static bool isReportedArchitectureX86(void)
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{
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#if QT_CONFIG(process) && QT_CONFIG(regularexpression)
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QProcess unamer;
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QString machineString;
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// Using syscall "uname" is not possible since that would be captured by
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// QEMU and result would be the architecture being emulated (e.g. armv7l).
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// By using QProcess we get the architecture used by the host.
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unamer.start("uname -a");
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if (!unamer.waitForFinished()) {
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return false;
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}
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machineString = unamer.readAll();
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// Is our current host cpu x86?
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if (machineString.contains(QRegularExpression("i386|i686|x86"))) {
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return true;
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}
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#endif
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return false;
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}
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#endif // SHOULD_CHECK_ARM_ON_X86
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} // EmulationDetector namespace
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QT_END_NAMESPACE
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#endif
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