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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtTest module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QEMULATIONDETECTOR_P_H
#define QEMULATIONDETECTOR_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
#if defined(Q_OS_LINUX) && defined(Q_PROCESSOR_ARM)
#define SHOULD_CHECK_ARM_ON_X86
#include <QFileInfo>
#if QT_CONFIG(process) && QT_CONFIG(regularexpression)
#include <QProcess>
#include <QRegularExpression>
#endif
#endif
QT_BEGIN_NAMESPACE
// Helper functions for detecting if running emulated
namespace QTestPrivate {
#ifdef SHOULD_CHECK_ARM_ON_X86
static bool isX86SpecificFileAvailable(void);
static bool isReportedArchitectureX86(void);
#endif
/*
* Check if we are running Arm binary on x86 machine.
*
* Currently this is only able to check on Linux. If not able to
* detect, return false.
*/
[[maybe_unused]] static bool isRunningArmOnX86()
{
#ifdef SHOULD_CHECK_ARM_ON_X86
if (isX86SpecificFileAvailable())
return true;
if (isReportedArchitectureX86())
return true;
#endif
return false;
}
#ifdef SHOULD_CHECK_ARM_ON_X86
/*
* Check if we can find a file that's only available on x86
*/
static bool isX86SpecificFileAvailable()
{
// MTRR (Memory Type Range Registers) are a feature of the x86 architecture
// and /proc/mtrr is only present (on Linux) for that family.
// However, it's an optional kernel feature, so the absence of the file is
// not sufficient to conclude we're on real hardware.
QFileInfo mtrr("/proc/mtrr");
if (mtrr.exists())
return true;
return false;
}
/*
* Check if architecture reported by the OS is x86
*/
static bool isReportedArchitectureX86(void)
{
#if QT_CONFIG(process) && QT_CONFIG(regularexpression)
QProcess unamer;
QString machineString;
// Using syscall "uname" is not possible since that would be captured by
// QEMU and result would be the architecture being emulated (e.g. armv7l).
// By using QProcess we get the architecture used by the host.
unamer.start("uname -a");
if (!unamer.waitForFinished()) {
return false;
}
machineString = unamer.readAll();
// Is our current host cpu x86?
if (machineString.contains(QRegularExpression("i386|i686|x86"))) {
return true;
}
#endif
return false;
}
#endif // SHOULD_CHECK_ARM_ON_X86
} // QTestPrivate namespace
QT_END_NAMESPACE
#endif
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