9b8f545920
Mark a CIE with a S in its augmentation string as signal frame.
This allows the code to properly handle signal frame data if none
of the signal frame pattern matchers work.
For a signal frame, DwarfSectionImpl<AddressType>::Eval needs to
continue the unwinding even if PC is zero. A zero PC means that the
program has crashed, and we should try to recover the real PC using the
return address on the stack or LR. This behavior is tested by
UnwindOffline.signal_{x86,x86_64}, which modify the libc.so files
so that the signal frame pattern matcher fails and the CIE/FDE
data is used instead.
Test: libunwindstack_test
Change-Id: I4655b070028fd984345311a5e743796f8c30ed36
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _LIBUNWINDSTACK_DWARF_STRUCTS_H
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#define _LIBUNWINDSTACK_DWARF_STRUCTS_H
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#include <stdint.h>
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#include <vector>
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namespace unwindstack {
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struct DwarfCie {
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uint8_t version = 0;
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uint8_t fde_address_encoding = 0;
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uint8_t lsda_encoding = 0;
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uint8_t segment_size = 0;
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std::vector<char> augmentation_string;
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uint64_t personality_handler = 0;
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uint64_t cfa_instructions_offset = 0;
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uint64_t cfa_instructions_end = 0;
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uint64_t code_alignment_factor = 0;
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int64_t data_alignment_factor = 0;
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uint64_t return_address_register = 0;
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bool is_signal_frame = false;
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};
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struct DwarfFde {
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uint64_t cie_offset = 0;
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uint64_t cfa_instructions_offset = 0;
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uint64_t cfa_instructions_end = 0;
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uint64_t pc_start = 0;
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uint64_t pc_end = 0;
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uint64_t lsda_address = 0;
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const DwarfCie* cie = nullptr;
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};
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constexpr uint16_t CFA_REG = static_cast<uint16_t>(-1);
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_DWARF_STRUCTS_H
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