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