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28 | |
29 | #ifndef EMULATIONDETECTOR_H |
30 | #define EMULATIONDETECTOR_H |
31 | |
32 | #include <QtCore/qglobal.h> |
33 | |
34 | #if defined(Q_OS_LINUX) && defined(Q_PROCESSOR_ARM) |
35 | #define SHOULD_CHECK_ARM_ON_X86 |
36 | |
37 | #include <QFileInfo> |
38 | |
39 | #if QT_CONFIG(process) && QT_CONFIG(regularexpression) |
40 | #include <QProcess> |
41 | #include <QRegularExpression> |
42 | #endif |
43 | |
44 | #endif |
45 | |
46 | QT_BEGIN_NAMESPACE |
47 | |
48 | // Helper functions for detecting if running emulated |
49 | namespace EmulationDetector { |
50 | |
51 | #ifdef SHOULD_CHECK_ARM_ON_X86 |
52 | static bool isX86SpecificFileAvailable(void); |
53 | static bool isReportedArchitectureX86(void); |
54 | #endif |
55 | |
56 | /* |
57 | * Check if we are running Arm binary on x86 machine. |
58 | * |
59 | * Currently this is only able to check on Linux. If not able to |
60 | * detect, return false. |
61 | */ |
62 | static Q_DECL_UNUSED bool isRunningArmOnX86() |
63 | { |
64 | #ifdef SHOULD_CHECK_ARM_ON_X86 |
65 | if (isX86SpecificFileAvailable()) |
66 | return true; |
67 | |
68 | if (isReportedArchitectureX86()) |
69 | return true; |
70 | #endif |
71 | return false; |
72 | } |
73 | |
74 | #ifdef SHOULD_CHECK_ARM_ON_X86 |
75 | /* |
76 | * Check if we can find a file that's only available on x86 |
77 | */ |
78 | static bool isX86SpecificFileAvailable() |
79 | { |
80 | // MTRR (Memory Type Range Registers) are a feature of the x86 architecture |
81 | // and /proc/mtrr is only present (on Linux) for that family. |
82 | // However, it's an optional kernel feature, so the absence of the file is |
83 | // not sufficient to conclude we're on real hardware. |
84 | QFileInfo mtrr("/proc/mtrr" ); |
85 | if (mtrr.exists()) |
86 | return true; |
87 | return false; |
88 | } |
89 | |
90 | /* |
91 | * Check if architecture reported by the OS is x86 |
92 | */ |
93 | static bool isReportedArchitectureX86(void) |
94 | { |
95 | #if QT_CONFIG(process) && QT_CONFIG(regularexpression) |
96 | QProcess unamer; |
97 | QString machineString; |
98 | |
99 | // Using syscall "uname" is not possible since that would be captured by |
100 | // QEMU and result would be the architecture being emulated (e.g. armv7l). |
101 | // By using QProcess we get the architecture used by the host. |
102 | unamer.start("uname -a" ); |
103 | if (!unamer.waitForFinished()) { |
104 | return false; |
105 | } |
106 | machineString = unamer.readAll(); |
107 | |
108 | // Is our current host cpu x86? |
109 | if (machineString.contains(QRegularExpression("i386|i686|x86" ))) { |
110 | return true; |
111 | } |
112 | #endif |
113 | |
114 | return false; |
115 | } |
116 | #endif // SHOULD_CHECK_ARM_ON_X86 |
117 | |
118 | } // EmulationDetector namespace |
119 | |
120 | QT_END_NAMESPACE |
121 | |
122 | #endif |
123 | |
124 | |