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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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/private/qglobal_p.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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