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//===-- 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
#elif SANITIZER_RISCV64
uptr fp = get_gr(context, 8); // x8
#else
#error Unsupported architecture
#endif
uptr sp = get_cfa(context);
TagMemory(UntagAddr(sp), UntagAddr(fp) - UntagAddr(sp),
GetTagFromPointer(sp));
}
return rc;
}
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