| 1 | //===- FuzzerExtraCounters.cpp - Extra coverage counters ------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // Extra coverage counters defined by user code. |
| 9 | //===----------------------------------------------------------------------===// |
| 10 | |
| 11 | #include "FuzzerPlatform.h" |
| 12 | #include <cstdint> |
| 13 | |
| 14 | #if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD || \ |
| 15 | LIBFUZZER_FUCHSIA || LIBFUZZER_EMSCRIPTEN |
| 16 | __attribute__((weak)) extern uint8_t __start___libfuzzer_extra_counters; |
| 17 | __attribute__((weak)) extern uint8_t __stop___libfuzzer_extra_counters; |
| 18 | |
| 19 | namespace fuzzer { |
| 20 | uint8_t *ExtraCountersBegin() { return &__start___libfuzzer_extra_counters; } |
| 21 | uint8_t *ExtraCountersEnd() { return &__stop___libfuzzer_extra_counters; } |
| 22 | ATTRIBUTE_NO_SANITIZE_ALL |
| 23 | void ClearExtraCounters() { // hand-written memset, don't asan-ify. |
| 24 | uintptr_t *Beg = reinterpret_cast<uintptr_t*>(ExtraCountersBegin()); |
| 25 | uintptr_t *End = reinterpret_cast<uintptr_t*>(ExtraCountersEnd()); |
| 26 | for (; Beg < End; Beg++) { |
| 27 | *Beg = 0; |
| 28 | __asm__ __volatile__("": : : "memory"); |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | } // namespace fuzzer |
| 33 | |
| 34 | #endif |
| 35 |