diff options
Diffstat (limited to 'lib/fuzzer/FuzzerTracePC.cpp')
-rw-r--r-- | lib/fuzzer/FuzzerTracePC.cpp | 49 |
1 files changed, 34 insertions, 15 deletions
diff --git a/lib/fuzzer/FuzzerTracePC.cpp b/lib/fuzzer/FuzzerTracePC.cpp index 1aba816e8..7ba75c7b2 100644 --- a/lib/fuzzer/FuzzerTracePC.cpp +++ b/lib/fuzzer/FuzzerTracePC.cpp @@ -32,8 +32,7 @@ ATTRIBUTE_INTERFACE uintptr_t __sancov_trace_pc_pcs[fuzzer::TracePC::kNumPCs]; // Used by -fsanitize-coverage=stack-depth to track stack depth -ATTRIBUTE_INTERFACE __attribute__((tls_model("initial-exec"))) -thread_local uintptr_t __sancov_lowest_stack; +ATTRIBUTES_INTERFACE_TLS_INITIAL_EXEC uintptr_t __sancov_lowest_stack; namespace fuzzer { @@ -195,11 +194,42 @@ void TracePC::HandleCallerCallee(uintptr_t Caller, uintptr_t Callee) { ValueProfileMap.AddValueModPrime(Idx); } +/// \return the address of the previous instruction. +/// Note: the logic is copied from `sanitizer_common/sanitizer_stacktrace.h` +inline ALWAYS_INLINE uintptr_t GetPreviousInstructionPc(uintptr_t PC) { +#if defined(__arm__) + // T32 (Thumb) branch instructions might be 16 or 32 bit long, + // so we return (pc-2) in that case in order to be safe. + // For A32 mode we return (pc-4) because all instructions are 32 bit long. + return (PC - 3) & (~1); +#elif defined(__powerpc__) || defined(__powerpc64__) || defined(__aarch64__) + // PCs are always 4 byte aligned. + return PC - 4; +#elif defined(__sparc__) || defined(__mips__) + return PC - 8; +#else + return PC - 1; +#endif +} + +/// \return the address of the next instruction. +/// Note: the logic is copied from `sanitizer_common/sanitizer_stacktrace.cc` +inline ALWAYS_INLINE uintptr_t GetNextInstructionPc(uintptr_t PC) { +#if defined(__mips__) + return PC + 8; +#elif defined(__powerpc__) || defined(__sparc__) || defined(__arm__) || \ + defined(__aarch64__) + return PC + 4; +#else + return PC + 1; +#endif +} + void TracePC::UpdateObservedPCs() { Vector<uintptr_t> CoveredFuncs; auto ObservePC = [&](uintptr_t PC) { if (ObservedPCs.insert(PC).second && DoPrintNewPCs) { - PrintPC("\tNEW_PC: %p %F %L", "\tNEW_PC: %p", PC + 1); + PrintPC("\tNEW_PC: %p %F %L", "\tNEW_PC: %p", GetNextInstructionPc(PC)); Printf("\n"); } }; @@ -234,22 +264,11 @@ void TracePC::UpdateObservedPCs() { for (size_t i = 0, N = Min(CoveredFuncs.size(), NumPrintNewFuncs); i < N; i++) { Printf("\tNEW_FUNC[%zd/%zd]: ", i + 1, CoveredFuncs.size()); - PrintPC("%p %F %L", "%p", CoveredFuncs[i] + 1); + PrintPC("%p %F %L", "%p", GetNextInstructionPc(CoveredFuncs[i])); Printf("\n"); } } -inline ALWAYS_INLINE uintptr_t GetPreviousInstructionPc(uintptr_t PC) { - // TODO: this implementation is x86 only. - // see sanitizer_common GetPreviousInstructionPc for full implementation. - return PC - 1; -} - -inline ALWAYS_INLINE uintptr_t GetNextInstructionPc(uintptr_t PC) { - // TODO: this implementation is x86 only. - // see sanitizer_common GetPreviousInstructionPc for full implementation. - return PC + 1; -} static std::string GetModuleName(uintptr_t PC) { char ModulePathRaw[4096] = ""; // What's PATH_MAX in portable C++? |