/*
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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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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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