1*0b57cec5SDimitry Andric //===-- xray_tsc.h ----------------------------------------------*- C++ -*-===// 2*0b57cec5SDimitry Andric // 3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric // 7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric // 9*0b57cec5SDimitry Andric // This file is a part of XRay, a dynamic runtime instrumentation system. 10*0b57cec5SDimitry Andric // 11*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 12*0b57cec5SDimitry Andric #ifndef XRAY_EMULATE_TSC_H 13*0b57cec5SDimitry Andric #define XRAY_EMULATE_TSC_H 14*0b57cec5SDimitry Andric 15*0b57cec5SDimitry Andric #include "sanitizer_common/sanitizer_common.h" 16*0b57cec5SDimitry Andric 17*0b57cec5SDimitry Andric namespace __xray { 18*0b57cec5SDimitry Andric static constexpr uint64_t NanosecondsPerSecond = 1000ULL * 1000 * 1000; 19*0b57cec5SDimitry Andric } 20*0b57cec5SDimitry Andric 21*0b57cec5SDimitry Andric #if SANITIZER_FUCHSIA 22*0b57cec5SDimitry Andric #include <zircon/syscalls.h> 23*0b57cec5SDimitry Andric 24*0b57cec5SDimitry Andric namespace __xray { 25*0b57cec5SDimitry Andric 26*0b57cec5SDimitry Andric inline bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; } 27*0b57cec5SDimitry Andric 28*0b57cec5SDimitry Andric ALWAYS_INLINE uint64_t readTSC(uint8_t &CPU) XRAY_NEVER_INSTRUMENT { 29*0b57cec5SDimitry Andric CPU = 0; 30*0b57cec5SDimitry Andric return _zx_ticks_get(); 31*0b57cec5SDimitry Andric } 32*0b57cec5SDimitry Andric 33*0b57cec5SDimitry Andric inline uint64_t getTSCFrequency() XRAY_NEVER_INSTRUMENT { 34*0b57cec5SDimitry Andric return _zx_ticks_per_second(); 35*0b57cec5SDimitry Andric } 36*0b57cec5SDimitry Andric 37*0b57cec5SDimitry Andric } // namespace __xray 38*0b57cec5SDimitry Andric 39*0b57cec5SDimitry Andric #else // SANITIZER_FUCHSIA 40*0b57cec5SDimitry Andric 41*0b57cec5SDimitry Andric #if defined(__x86_64__) 42*0b57cec5SDimitry Andric #include "xray_x86_64.inc" 43*0b57cec5SDimitry Andric #elif defined(__powerpc64__) 44*0b57cec5SDimitry Andric #include "xray_powerpc64.inc" 45*0b57cec5SDimitry Andric #elif defined(__arm__) || defined(__aarch64__) || defined(__mips__) 46*0b57cec5SDimitry Andric // Emulated TSC. 47*0b57cec5SDimitry Andric // There is no instruction like RDTSCP in user mode on ARM. ARM's CP15 does 48*0b57cec5SDimitry Andric // not have a constant frequency like TSC on x86(_64), it may go faster 49*0b57cec5SDimitry Andric // or slower depending on CPU turbo or power saving mode. Furthermore, 50*0b57cec5SDimitry Andric // to read from CP15 on ARM a kernel modification or a driver is needed. 51*0b57cec5SDimitry Andric // We can not require this from users of compiler-rt. 52*0b57cec5SDimitry Andric // So on ARM we use clock_gettime() which gives the result in nanoseconds. 53*0b57cec5SDimitry Andric // To get the measurements per second, we scale this by the number of 54*0b57cec5SDimitry Andric // nanoseconds per second, pretending that the TSC frequency is 1GHz and 55*0b57cec5SDimitry Andric // one TSC tick is 1 nanosecond. 56*0b57cec5SDimitry Andric #include "sanitizer_common/sanitizer_common.h" 57*0b57cec5SDimitry Andric #include "sanitizer_common/sanitizer_internal_defs.h" 58*0b57cec5SDimitry Andric #include "xray_defs.h" 59*0b57cec5SDimitry Andric #include <cerrno> 60*0b57cec5SDimitry Andric #include <cstdint> 61*0b57cec5SDimitry Andric #include <time.h> 62*0b57cec5SDimitry Andric 63*0b57cec5SDimitry Andric namespace __xray { 64*0b57cec5SDimitry Andric 65*0b57cec5SDimitry Andric inline bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; } 66*0b57cec5SDimitry Andric 67*0b57cec5SDimitry Andric ALWAYS_INLINE uint64_t readTSC(uint8_t &CPU) XRAY_NEVER_INSTRUMENT { 68*0b57cec5SDimitry Andric timespec TS; 69*0b57cec5SDimitry Andric int result = clock_gettime(CLOCK_REALTIME, &TS); 70*0b57cec5SDimitry Andric if (result != 0) { 71*0b57cec5SDimitry Andric Report("clock_gettime(2) returned %d, errno=%d.", result, int(errno)); 72*0b57cec5SDimitry Andric TS.tv_sec = 0; 73*0b57cec5SDimitry Andric TS.tv_nsec = 0; 74*0b57cec5SDimitry Andric } 75*0b57cec5SDimitry Andric CPU = 0; 76*0b57cec5SDimitry Andric return TS.tv_sec * NanosecondsPerSecond + TS.tv_nsec; 77*0b57cec5SDimitry Andric } 78*0b57cec5SDimitry Andric 79*0b57cec5SDimitry Andric inline uint64_t getTSCFrequency() XRAY_NEVER_INSTRUMENT { 80*0b57cec5SDimitry Andric return NanosecondsPerSecond; 81*0b57cec5SDimitry Andric } 82*0b57cec5SDimitry Andric 83*0b57cec5SDimitry Andric } // namespace __xray 84*0b57cec5SDimitry Andric 85*0b57cec5SDimitry Andric #else 86*0b57cec5SDimitry Andric #error Target architecture is not supported. 87*0b57cec5SDimitry Andric #endif // CPU architecture 88*0b57cec5SDimitry Andric #endif // SANITIZER_FUCHSIA 89*0b57cec5SDimitry Andric 90*0b57cec5SDimitry Andric #endif // XRAY_EMULATE_TSC_H 91