1*a7c257b0Skamil //===- FuzzerExtraCounters.cpp - Extra coverage counters ------------------===// 2*a7c257b0Skamil // 3*a7c257b0Skamil // The LLVM Compiler Infrastructure 4*a7c257b0Skamil // 5*a7c257b0Skamil // This file is distributed under the University of Illinois Open Source 6*a7c257b0Skamil // License. See LICENSE.TXT for details. 7*a7c257b0Skamil // 8*a7c257b0Skamil //===----------------------------------------------------------------------===// 9*a7c257b0Skamil // Extra coverage counters defined by user code. 10*a7c257b0Skamil //===----------------------------------------------------------------------===// 11*a7c257b0Skamil 12*a7c257b0Skamil #include "FuzzerDefs.h" 13*a7c257b0Skamil 14*a7c257b0Skamil #if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD || \ 15*a7c257b0Skamil LIBFUZZER_OPENBSD 16*a7c257b0Skamil __attribute__((weak)) extern uint8_t __start___libfuzzer_extra_counters; 17*a7c257b0Skamil __attribute__((weak)) extern uint8_t __stop___libfuzzer_extra_counters; 18*a7c257b0Skamil 19*a7c257b0Skamil namespace fuzzer { ExtraCountersBegin()20*a7c257b0Skamiluint8_t *ExtraCountersBegin() { return &__start___libfuzzer_extra_counters; } ExtraCountersEnd()21*a7c257b0Skamiluint8_t *ExtraCountersEnd() { return &__stop___libfuzzer_extra_counters; } 22*a7c257b0Skamil ATTRIBUTE_NO_SANITIZE_ALL ClearExtraCounters()23*a7c257b0Skamilvoid ClearExtraCounters() { // hand-written memset, don't asan-ify. 24*a7c257b0Skamil uintptr_t *Beg = reinterpret_cast<uintptr_t*>(ExtraCountersBegin()); 25*a7c257b0Skamil uintptr_t *End = reinterpret_cast<uintptr_t*>(ExtraCountersEnd()); 26*a7c257b0Skamil for (; Beg < End; Beg++) { 27*a7c257b0Skamil *Beg = 0; 28*a7c257b0Skamil __asm__ __volatile__("" : : : "memory"); 29*a7c257b0Skamil } 30*a7c257b0Skamil } 31*a7c257b0Skamil 32*a7c257b0Skamil } // namespace fuzzer 33*a7c257b0Skamil 34*a7c257b0Skamil #else 35*a7c257b0Skamil // TODO: implement for other platforms. 36*a7c257b0Skamil namespace fuzzer { ExtraCountersBegin()37*a7c257b0Skamiluint8_t *ExtraCountersBegin() { return nullptr; } ExtraCountersEnd()38*a7c257b0Skamiluint8_t *ExtraCountersEnd() { return nullptr; } ClearExtraCounters()39*a7c257b0Skamilvoid ClearExtraCounters() {} 40*a7c257b0Skamil } // namespace fuzzer 41*a7c257b0Skamil 42*a7c257b0Skamil #endif 43