| //===-- xray_tsc.h ----------------------------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is a part of XRay, a dynamic runtime instrumentation system. |
| // |
| //===----------------------------------------------------------------------===// |
| #ifndef XRAY_EMULATE_TSC_H |
| #define XRAY_EMULATE_TSC_H |
| |
| #include "sanitizer_common/sanitizer_common.h" |
| |
| namespace __xray { |
| static constexpr uint64_t NanosecondsPerSecond = 1000ULL * 1000 * 1000; |
| } |
| |
| #if SANITIZER_FUCHSIA |
| #include <zircon/syscalls.h> |
| |
| namespace __xray { |
| |
| inline bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; } |
| |
| ALWAYS_INLINE uint64_t readTSC(uint8_t &CPU) XRAY_NEVER_INSTRUMENT { |
| CPU = 0; |
| return _zx_ticks_get(); |
| } |
| |
| inline uint64_t getTSCFrequency() XRAY_NEVER_INSTRUMENT { |
| return _zx_ticks_per_second(); |
| } |
| |
| } // namespace __xray |
| |
| #else // SANITIZER_FUCHSIA |
| |
| #if defined(__x86_64__) |
| #include "xray_x86_64.inc" |
| #elif defined(__powerpc64__) |
| #include "xray_powerpc64.inc" |
| #elif defined(__arm__) || defined(__aarch64__) || defined(__mips__) |
| // Emulated TSC. |
| // There is no instruction like RDTSCP in user mode on ARM. ARM's CP15 does |
| // not have a constant frequency like TSC on x86(_64), it may go faster |
| // or slower depending on CPU turbo or power saving mode. Furthermore, |
| // to read from CP15 on ARM a kernel modification or a driver is needed. |
| // We can not require this from users of compiler-rt. |
| // So on ARM we use clock_gettime() which gives the result in nanoseconds. |
| // To get the measurements per second, we scale this by the number of |
| // nanoseconds per second, pretending that the TSC frequency is 1GHz and |
| // one TSC tick is 1 nanosecond. |
| #include "sanitizer_common/sanitizer_common.h" |
| #include "sanitizer_common/sanitizer_internal_defs.h" |
| #include "xray_defs.h" |
| #include <cerrno> |
| #include <cstdint> |
| #include <time.h> |
| |
| namespace __xray { |
| |
| inline bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; } |
| |
| ALWAYS_INLINE uint64_t readTSC(uint8_t &CPU) XRAY_NEVER_INSTRUMENT { |
| timespec TS; |
| int result = clock_gettime(CLOCK_REALTIME, &TS); |
| if (result != 0) { |
| Report("clock_gettime(2) returned %d, errno=%d.", result, int(errno)); |
| TS.tv_sec = 0; |
| TS.tv_nsec = 0; |
| } |
| CPU = 0; |
| return TS.tv_sec * NanosecondsPerSecond + TS.tv_nsec; |
| } |
| |
| inline uint64_t getTSCFrequency() XRAY_NEVER_INSTRUMENT { |
| return NanosecondsPerSecond; |
| } |
| |
| } // namespace __xray |
| |
| #else |
| #error Target architecture is not supported. |
| #endif // CPU architecture |
| #endif // SANITIZER_FUCHSIA |
| |
| #endif // XRAY_EMULATE_TSC_H |