71 lines · cpp
1//===-- hwasan_exceptions.cpp ---------------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8//9// This file is a part of HWAddressSanitizer.10//11// HWAddressSanitizer runtime.12//===----------------------------------------------------------------------===//13 14#include "hwasan_poisoning.h"15#include "sanitizer_common/sanitizer_common.h"16 17#include <unwind.h>18 19using namespace __hwasan;20using namespace __sanitizer;21 22typedef _Unwind_Reason_Code PersonalityFn(int version, _Unwind_Action actions,23 uint64_t exception_class,24 _Unwind_Exception* unwind_exception,25 _Unwind_Context* context);26 27// Pointers to the _Unwind_GetGR and _Unwind_GetCFA functions are passed in28// instead of being called directly. This is to handle cases where the unwinder29// is statically linked and the sanitizer runtime and the program are linked30// against different unwinders. The _Unwind_Context data structure is opaque so31// it may be incompatible between unwinders.32typedef uintptr_t GetGRFn(_Unwind_Context* context, int index);33typedef uintptr_t GetCFAFn(_Unwind_Context* context);34 35extern "C" SANITIZER_INTERFACE_ATTRIBUTE _Unwind_Reason_Code36__hwasan_personality_wrapper(int version, _Unwind_Action actions,37 uint64_t exception_class,38 _Unwind_Exception* unwind_exception,39 _Unwind_Context* context,40 PersonalityFn* real_personality, GetGRFn* get_gr,41 GetCFAFn* get_cfa) {42 _Unwind_Reason_Code rc;43 if (real_personality)44 rc = real_personality(version, actions, exception_class, unwind_exception,45 context);46 else47 rc = _URC_CONTINUE_UNWIND;48 49 // We only untag frames without a landing pad because landing pads are50 // responsible for untagging the stack themselves if they resume.51 //52 // Here we assume that the frame record appears after any locals. This is not53 // required by AAPCS but is a requirement for HWASAN instrumented functions.54 if ((actions & _UA_CLEANUP_PHASE) && rc == _URC_CONTINUE_UNWIND) {55#if defined(__x86_64__)56 uptr fp = get_gr(context, 6); // rbp57#elif defined(__aarch64__)58 uptr fp = get_gr(context, 29); // x2959#elif SANITIZER_RISCV6460 uptr fp = get_gr(context, 8); // x861#else62#error Unsupported architecture63#endif64 uptr sp = get_cfa(context);65 TagMemory(UntagAddr(sp), UntagAddr(fp) - UntagAddr(sp),66 GetTagFromPointer(sp));67 }68 69 return rc;70}71