1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <stdint.h> 20 21 #include <memory> 22 #include <unordered_map> 23 #include <vector> 24 25 #include <unwindstack/DwarfSection.h> 26 27 namespace unwindstack { 28 29 // Forward declarations. 30 class Memory; 31 struct SectionInfo; 32 33 template <typename AddressType> 34 class DwarfEhFrameWithHdr : public DwarfSectionImpl<AddressType> { 35 public: 36 // Add these so that the protected members of DwarfSectionImpl 37 // can be accessed without needing a this->. 38 using DwarfSectionImpl<AddressType>::memory_; 39 using DwarfSectionImpl<AddressType>::last_error_; 40 41 struct FdeInfo { 42 AddressType pc; 43 uint64_t offset; 44 }; 45 DwarfEhFrameWithHdr(std::shared_ptr<Memory> & memory)46 DwarfEhFrameWithHdr(std::shared_ptr<Memory>& memory) : DwarfSectionImpl<AddressType>(memory) {} 47 virtual ~DwarfEhFrameWithHdr() = default; 48 GetCieOffsetFromFde32(uint32_t pointer)49 uint64_t GetCieOffsetFromFde32(uint32_t pointer) override { 50 return memory_.cur_offset() - pointer - 4; 51 } 52 GetCieOffsetFromFde64(uint64_t pointer)53 uint64_t GetCieOffsetFromFde64(uint64_t pointer) override { 54 return memory_.cur_offset() - pointer - 8; 55 } 56 AdjustPcFromFde(uint64_t pc)57 uint64_t AdjustPcFromFde(uint64_t pc) override { 58 // The eh_frame uses relative pcs. 59 return pc + memory_.cur_offset() - 4; 60 } 61 62 bool EhFrameInit(const SectionInfo& info); 63 bool Init(const SectionInfo& info) override; 64 65 const DwarfFde* GetFdeFromPc(uint64_t pc) override; 66 67 bool GetFdeOffsetFromPc(uint64_t pc, uint64_t* fde_offset); 68 69 const FdeInfo* GetFdeInfoFromIndex(size_t index); 70 71 void GetFdes(std::vector<const DwarfFde*>* fdes) override; 72 73 protected: 74 uint8_t version_ = 0; 75 uint8_t table_encoding_ = 0; 76 size_t table_entry_size_ = 0; 77 78 uint64_t hdr_entries_offset_ = 0; 79 uint64_t hdr_entries_data_offset_ = 0; 80 uint64_t hdr_section_bias_ = 0; 81 82 uint64_t fde_count_ = 0; 83 std::unordered_map<uint64_t, FdeInfo> fde_info_; 84 }; 85 86 } // namespace unwindstack 87