| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef _LIBUNWINDSTACK_DWARF_EH_FRAME_H |
| #define _LIBUNWINDSTACK_DWARF_EH_FRAME_H |
| |
| #include <stdint.h> |
| |
| #include "DwarfSection.h" |
| |
| // Forward declarations. |
| class Memory; |
| |
| template <typename AddressType> |
| class DwarfEhFrame : public DwarfSectionImpl<AddressType> { |
| public: |
| // Add these so that the protected members of DwarfSectionImpl |
| // can be accessed without needing a this->. |
| using DwarfSectionImpl<AddressType>::memory_; |
| using DwarfSectionImpl<AddressType>::fde_count_; |
| using DwarfSectionImpl<AddressType>::last_error_; |
| |
| struct FdeInfo { |
| AddressType pc; |
| uint64_t offset; |
| }; |
| |
| DwarfEhFrame(Memory* memory) : DwarfSectionImpl<AddressType>(memory) {} |
| virtual ~DwarfEhFrame() = default; |
| |
| bool Init(uint64_t offset, uint64_t size) override; |
| |
| bool GetFdeOffsetFromPc(uint64_t pc, uint64_t* fde_offset) override; |
| |
| const DwarfFde* GetFdeFromIndex(size_t index) override; |
| |
| bool IsCie32(uint32_t value32) override { return value32 == 0; } |
| |
| bool IsCie64(uint64_t value64) override { return value64 == 0; } |
| |
| uint64_t GetCieOffsetFromFde32(uint32_t pointer) override { |
| return memory_.cur_offset() - pointer - 4; |
| } |
| |
| uint64_t GetCieOffsetFromFde64(uint64_t pointer) override { |
| return memory_.cur_offset() - pointer - 8; |
| } |
| |
| uint64_t AdjustPcFromFde(uint64_t pc) override { |
| // The eh_frame uses relative pcs. |
| return pc + memory_.cur_offset(); |
| } |
| |
| const FdeInfo* GetFdeInfoFromIndex(size_t index); |
| |
| bool GetFdeOffsetSequential(uint64_t pc, uint64_t* fde_offset); |
| |
| bool GetFdeOffsetBinary(uint64_t pc, uint64_t* fde_offset, uint64_t total_entries); |
| |
| protected: |
| uint8_t version_; |
| uint8_t ptr_encoding_; |
| uint8_t table_encoding_; |
| size_t table_entry_size_; |
| |
| uint64_t ptr_offset_; |
| |
| uint64_t entries_offset_; |
| uint64_t entries_end_; |
| uint64_t entries_data_offset_; |
| uint64_t cur_entries_offset_ = 0; |
| |
| std::unordered_map<uint64_t, FdeInfo> fde_info_; |
| }; |
| |
| #endif // _LIBUNWINDSTACK_DWARF_EH_FRAME_H |