1*4ba319b5SDimitry Andric //===- FuzzerExtraCounters.cpp - Extra coverage counters ------------------===// 2*4ba319b5SDimitry Andric // 3*4ba319b5SDimitry Andric // The LLVM Compiler Infrastructure 4*4ba319b5SDimitry Andric // 5*4ba319b5SDimitry Andric // This file is distributed under the University of Illinois Open Source 6*4ba319b5SDimitry Andric // License. See LICENSE.TXT for details. 7*4ba319b5SDimitry Andric // 8*4ba319b5SDimitry Andric //===----------------------------------------------------------------------===// 9*4ba319b5SDimitry Andric // Extra coverage counters defined by user code. 10*4ba319b5SDimitry Andric //===----------------------------------------------------------------------===// 11*4ba319b5SDimitry Andric 12*4ba319b5SDimitry Andric #include "FuzzerDefs.h" 13*4ba319b5SDimitry Andric 14*4ba319b5SDimitry Andric #if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD || \ 15*4ba319b5SDimitry Andric LIBFUZZER_OPENBSD 16*4ba319b5SDimitry Andric __attribute__((weak)) extern uint8_t __start___libfuzzer_extra_counters; 17*4ba319b5SDimitry Andric __attribute__((weak)) extern uint8_t __stop___libfuzzer_extra_counters; 18*4ba319b5SDimitry Andric 19*4ba319b5SDimitry Andric namespace fuzzer { ExtraCountersBegin()20*4ba319b5SDimitry Andricuint8_t *ExtraCountersBegin() { return &__start___libfuzzer_extra_counters; } ExtraCountersEnd()21*4ba319b5SDimitry Andricuint8_t *ExtraCountersEnd() { return &__stop___libfuzzer_extra_counters; } 22*4ba319b5SDimitry Andric ATTRIBUTE_NO_SANITIZE_ALL ClearExtraCounters()23*4ba319b5SDimitry Andricvoid ClearExtraCounters() { // hand-written memset, don't asan-ify. 24*4ba319b5SDimitry Andric uintptr_t *Beg = reinterpret_cast<uintptr_t*>(ExtraCountersBegin()); 25*4ba319b5SDimitry Andric uintptr_t *End = reinterpret_cast<uintptr_t*>(ExtraCountersEnd()); 26*4ba319b5SDimitry Andric for (; Beg < End; Beg++) { 27*4ba319b5SDimitry Andric *Beg = 0; 28*4ba319b5SDimitry Andric __asm__ __volatile__("" : : : "memory"); 29*4ba319b5SDimitry Andric } 30*4ba319b5SDimitry Andric } 31*4ba319b5SDimitry Andric 32*4ba319b5SDimitry Andric } // namespace fuzzer 33*4ba319b5SDimitry Andric 34*4ba319b5SDimitry Andric #else 35*4ba319b5SDimitry Andric // TODO: implement for other platforms. 36*4ba319b5SDimitry Andric namespace fuzzer { ExtraCountersBegin()37*4ba319b5SDimitry Andricuint8_t *ExtraCountersBegin() { return nullptr; } ExtraCountersEnd()38*4ba319b5SDimitry Andricuint8_t *ExtraCountersEnd() { return nullptr; } ClearExtraCounters()39*4ba319b5SDimitry Andricvoid ClearExtraCounters() {} 40*4ba319b5SDimitry Andric } // namespace fuzzer 41*4ba319b5SDimitry Andric 42*4ba319b5SDimitry Andric #endif 43