92acaac8c7
Modify the code for the no header sections because it turns out that it is not okay to assume that the fdes are non-overlapping. It's necessary to read the fdes in order and match as you go. Modify the code so that it only reads until it finds the given pc rather than reading all of the cie/fde entries at once. Rewrote the tests to verify the new behavior. Bug: 68998033 Bug: 110235461 Test: Ran libbacktrace/libunwindstack unit tests. Test: Unwind the mediaserver process on a walleye and verify it Test: unwinds properly. Change-Id: I7bb59d1db72c13fa34caa9735ec34c1a60e20ed2
95 lines
2.7 KiB
C++
95 lines
2.7 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_EH_FRAME_WITH_HDR_H
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#define _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H
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#include <stdint.h>
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#include <unordered_map>
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#include <unwindstack/DwarfSection.h>
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namespace unwindstack {
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// Forward declarations.
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class Memory;
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template <typename AddressType>
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class DwarfEhFrameWithHdr : public DwarfSectionImpl<AddressType> {
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public:
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// Add these so that the protected members of DwarfSectionImpl
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// can be accessed without needing a this->.
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using DwarfSectionImpl<AddressType>::memory_;
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using DwarfSectionImpl<AddressType>::pc_offset_;
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using DwarfSectionImpl<AddressType>::entries_offset_;
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using DwarfSectionImpl<AddressType>::entries_end_;
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using DwarfSectionImpl<AddressType>::last_error_;
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using DwarfSectionImpl<AddressType>::load_bias_;
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struct FdeInfo {
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AddressType pc;
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uint64_t offset;
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};
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DwarfEhFrameWithHdr(Memory* memory) : DwarfSectionImpl<AddressType>(memory) {}
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virtual ~DwarfEhFrameWithHdr() = default;
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uint64_t GetCieOffsetFromFde32(uint32_t pointer) override {
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return this->memory_.cur_offset() - pointer - 4;
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}
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uint64_t GetCieOffsetFromFde64(uint64_t pointer) override {
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return this->memory_.cur_offset() - pointer - 8;
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}
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uint64_t AdjustPcFromFde(uint64_t pc) override {
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// The eh_frame uses relative pcs.
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return pc + this->memory_.cur_offset() - 4;
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}
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bool Init(uint64_t offset, uint64_t size, uint64_t load_bias) override;
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const DwarfFde* GetFdeFromPc(uint64_t pc) override;
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bool GetFdeOffsetFromPc(uint64_t pc, uint64_t* fde_offset);
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const FdeInfo* GetFdeInfoFromIndex(size_t index);
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bool GetFdeOffsetSequential(uint64_t pc, uint64_t* fde_offset);
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bool GetFdeOffsetBinary(uint64_t pc, uint64_t* fde_offset, uint64_t total_entries);
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void GetFdes(std::vector<const DwarfFde*>* fdes) override;
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protected:
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uint8_t version_;
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uint8_t ptr_encoding_;
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uint8_t table_encoding_;
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size_t table_entry_size_;
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uint64_t ptr_offset_;
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uint64_t entries_data_offset_;
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uint64_t cur_entries_offset_ = 0;
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uint64_t fde_count_;
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std::unordered_map<uint64_t, FdeInfo> fde_info_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H
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