diff options
Diffstat (limited to 'compiler-rt/lib/hwasan/hwasan_exceptions.cpp')
-rw-r--r-- | compiler-rt/lib/hwasan/hwasan_exceptions.cpp | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/compiler-rt/lib/hwasan/hwasan_exceptions.cpp b/compiler-rt/lib/hwasan/hwasan_exceptions.cpp new file mode 100644 index 000000000000..169e7876cb58 --- /dev/null +++ b/compiler-rt/lib/hwasan/hwasan_exceptions.cpp @@ -0,0 +1,67 @@ +//===-- hwasan_exceptions.cpp ---------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// This file is a part of HWAddressSanitizer. +// +// HWAddressSanitizer runtime. +//===----------------------------------------------------------------------===// + +#include "hwasan_poisoning.h" +#include "sanitizer_common/sanitizer_common.h" + +#include <unwind.h> + +using namespace __hwasan; +using namespace __sanitizer; + +typedef _Unwind_Reason_Code PersonalityFn(int version, _Unwind_Action actions, + uint64_t exception_class, + _Unwind_Exception* unwind_exception, + _Unwind_Context* context); + +// Pointers to the _Unwind_GetGR and _Unwind_GetCFA functions are passed in +// instead of being called directly. This is to handle cases where the unwinder +// is statically linked and the sanitizer runtime and the program are linked +// against different unwinders. The _Unwind_Context data structure is opaque so +// it may be incompatible between unwinders. +typedef _Unwind_Word GetGRFn(_Unwind_Context* context, int index); +typedef _Unwind_Word GetCFAFn(_Unwind_Context* context); + +extern "C" SANITIZER_INTERFACE_ATTRIBUTE _Unwind_Reason_Code +__hwasan_personality_wrapper(int version, _Unwind_Action actions, + uint64_t exception_class, + _Unwind_Exception* unwind_exception, + _Unwind_Context* context, + PersonalityFn* real_personality, GetGRFn* get_gr, + GetCFAFn* get_cfa) { + _Unwind_Reason_Code rc; + if (real_personality) + rc = real_personality(version, actions, exception_class, unwind_exception, + context); + else + rc = _URC_CONTINUE_UNWIND; + + // We only untag frames without a landing pad because landing pads are + // responsible for untagging the stack themselves if they resume. + // + // Here we assume that the frame record appears after any locals. This is not + // required by AAPCS but is a requirement for HWASAN instrumented functions. + if ((actions & _UA_CLEANUP_PHASE) && rc == _URC_CONTINUE_UNWIND) { +#if defined(__x86_64__) + uptr fp = get_gr(context, 6); // rbp +#elif defined(__aarch64__) + uptr fp = get_gr(context, 29); // x29 +#else +#error Unsupported architecture +#endif + uptr sp = get_cfa(context); + TagMemory(sp, fp - sp, 0); + } + + return rc; +} |