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