1 //===-- xray_tsc.h ----------------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is a part of XRay, a dynamic runtime instrumentation system.
12 //===----------------------------------------------------------------------===//
13 #ifndef XRAY_EMULATE_TSC_H
14 #define XRAY_EMULATE_TSC_H
16 #include "sanitizer_common/sanitizer_common.h"
19 static constexpr uint64_t NanosecondsPerSecond = 1000ULL * 1000 * 1000;
23 #include <zircon/syscalls.h>
27 inline bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; }
29 ALWAYS_INLINE uint64_t readTSC(uint8_t &CPU) XRAY_NEVER_INSTRUMENT {
31 return _zx_ticks_get();
34 inline uint64_t getTSCFrequency() XRAY_NEVER_INSTRUMENT {
35 return _zx_ticks_per_second();
40 #else // SANITIZER_FUCHSIA
42 #if defined(__x86_64__)
43 #include "xray_x86_64.inc"
44 #elif defined(__powerpc64__)
45 #include "xray_powerpc64.inc"
46 #elif defined(__arm__) || defined(__aarch64__) || defined(__mips__)
48 // There is no instruction like RDTSCP in user mode on ARM. ARM's CP15 does
49 // not have a constant frequency like TSC on x86(_64), it may go faster
50 // or slower depending on CPU turbo or power saving mode. Furthermore,
51 // to read from CP15 on ARM a kernel modification or a driver is needed.
52 // We can not require this from users of compiler-rt.
53 // So on ARM we use clock_gettime() which gives the result in nanoseconds.
54 // To get the measurements per second, we scale this by the number of
55 // nanoseconds per second, pretending that the TSC frequency is 1GHz and
56 // one TSC tick is 1 nanosecond.
57 #include "sanitizer_common/sanitizer_common.h"
58 #include "sanitizer_common/sanitizer_internal_defs.h"
59 #include "xray_defs.h"
66 inline bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; }
68 ALWAYS_INLINE uint64_t readTSC(uint8_t &CPU) XRAY_NEVER_INSTRUMENT {
70 int result = clock_gettime(CLOCK_REALTIME, &TS);
72 Report("clock_gettime(2) returned %d, errno=%d.", result, int(errno));
77 return TS.tv_sec * NanosecondsPerSecond + TS.tv_nsec;
80 inline uint64_t getTSCFrequency() XRAY_NEVER_INSTRUMENT {
81 return NanosecondsPerSecond;
87 #error Target architecture is not supported.
88 #endif // CPU architecture
89 #endif // SANITIZER_FUCHSIA
91 #endif // XRAY_EMULATE_TSC_H