67 lines
2.7 KiB
C++
67 lines
2.7 KiB
C++
//===-- 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 uintptr_t GetGRFn(_Unwind_Context* context, int index);
|
|
typedef uintptr_t 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;
|
|
}
|