168d75effSDimitry Andric //===-- hwasan_exceptions.cpp ---------------------------------------------===// 268d75effSDimitry Andric // 368d75effSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 468d75effSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 568d75effSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 668d75effSDimitry Andric // 768d75effSDimitry Andric //===----------------------------------------------------------------------===// 868d75effSDimitry Andric // 968d75effSDimitry Andric // This file is a part of HWAddressSanitizer. 1068d75effSDimitry Andric // 1168d75effSDimitry Andric // HWAddressSanitizer runtime. 1268d75effSDimitry Andric //===----------------------------------------------------------------------===// 1368d75effSDimitry Andric 1468d75effSDimitry Andric #include "hwasan_poisoning.h" 1568d75effSDimitry Andric #include "sanitizer_common/sanitizer_common.h" 1668d75effSDimitry Andric 1768d75effSDimitry Andric #include <unwind.h> 1868d75effSDimitry Andric 1968d75effSDimitry Andric using namespace __hwasan; 2068d75effSDimitry Andric using namespace __sanitizer; 2168d75effSDimitry Andric 2268d75effSDimitry Andric typedef _Unwind_Reason_Code PersonalityFn(int version, _Unwind_Action actions, 2368d75effSDimitry Andric uint64_t exception_class, 2468d75effSDimitry Andric _Unwind_Exception* unwind_exception, 2568d75effSDimitry Andric _Unwind_Context* context); 2668d75effSDimitry Andric 2768d75effSDimitry Andric // Pointers to the _Unwind_GetGR and _Unwind_GetCFA functions are passed in 2868d75effSDimitry Andric // instead of being called directly. This is to handle cases where the unwinder 2968d75effSDimitry Andric // is statically linked and the sanitizer runtime and the program are linked 3068d75effSDimitry Andric // against different unwinders. The _Unwind_Context data structure is opaque so 3168d75effSDimitry Andric // it may be incompatible between unwinders. 32349cc55cSDimitry Andric typedef uintptr_t GetGRFn(_Unwind_Context* context, int index); 33349cc55cSDimitry Andric typedef uintptr_t GetCFAFn(_Unwind_Context* context); 3468d75effSDimitry Andric 3568d75effSDimitry Andric extern "C" SANITIZER_INTERFACE_ATTRIBUTE _Unwind_Reason_Code 3668d75effSDimitry Andric __hwasan_personality_wrapper(int version, _Unwind_Action actions, 3768d75effSDimitry Andric uint64_t exception_class, 3868d75effSDimitry Andric _Unwind_Exception* unwind_exception, 3968d75effSDimitry Andric _Unwind_Context* context, 4068d75effSDimitry Andric PersonalityFn* real_personality, GetGRFn* get_gr, 4168d75effSDimitry Andric GetCFAFn* get_cfa) { 4268d75effSDimitry Andric _Unwind_Reason_Code rc; 4368d75effSDimitry Andric if (real_personality) 4468d75effSDimitry Andric rc = real_personality(version, actions, exception_class, unwind_exception, 4568d75effSDimitry Andric context); 4668d75effSDimitry Andric else 4768d75effSDimitry Andric rc = _URC_CONTINUE_UNWIND; 4868d75effSDimitry Andric 4968d75effSDimitry Andric // We only untag frames without a landing pad because landing pads are 5068d75effSDimitry Andric // responsible for untagging the stack themselves if they resume. 5168d75effSDimitry Andric // 5268d75effSDimitry Andric // Here we assume that the frame record appears after any locals. This is not 5368d75effSDimitry Andric // required by AAPCS but is a requirement for HWASAN instrumented functions. 5468d75effSDimitry Andric if ((actions & _UA_CLEANUP_PHASE) && rc == _URC_CONTINUE_UNWIND) { 5568d75effSDimitry Andric #if defined(__x86_64__) 5668d75effSDimitry Andric uptr fp = get_gr(context, 6); // rbp 5768d75effSDimitry Andric #elif defined(__aarch64__) 5868d75effSDimitry Andric uptr fp = get_gr(context, 29); // x29 59*bdd1243dSDimitry Andric #elif SANITIZER_RISCV64 60*bdd1243dSDimitry Andric uptr fp = get_gr(context, 8); // x8 6168d75effSDimitry Andric #else 6268d75effSDimitry Andric #error Unsupported architecture 6368d75effSDimitry Andric #endif 6468d75effSDimitry Andric uptr sp = get_cfa(context); 6568d75effSDimitry Andric TagMemory(sp, fp - sp, 0); 6668d75effSDimitry Andric } 6768d75effSDimitry Andric 6868d75effSDimitry Andric return rc; 6968d75effSDimitry Andric } 70