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 <unordered_map> 22 23 #include <unwindstack/DwarfSection.h> 24 25 namespace unwindstack { 26 27 // Forward declarations. 28 class Memory; 29 30 template <typename AddressType> 31 class DwarfEhFrameWithHdr : public DwarfSectionImpl<AddressType> { 32 public: 33 // Add these so that the protected members of DwarfSectionImpl 34 // can be accessed without needing a this->. 35 using DwarfSectionImpl<AddressType>::memory_; 36 using DwarfSectionImpl<AddressType>::last_error_; 37 38 struct FdeInfo { 39 AddressType pc; 40 uint64_t offset; 41 }; 42 DwarfEhFrameWithHdr(Memory * memory)43 DwarfEhFrameWithHdr(Memory* memory) : DwarfSectionImpl<AddressType>(memory) {} 44 virtual ~DwarfEhFrameWithHdr() = default; 45 GetCieOffsetFromFde32(uint32_t pointer)46 uint64_t GetCieOffsetFromFde32(uint32_t pointer) override { 47 return memory_.cur_offset() - pointer - 4; 48 } 49 GetCieOffsetFromFde64(uint64_t pointer)50 uint64_t GetCieOffsetFromFde64(uint64_t pointer) override { 51 return memory_.cur_offset() - pointer - 8; 52 } 53 AdjustPcFromFde(uint64_t pc)54 uint64_t AdjustPcFromFde(uint64_t pc) override { 55 // The eh_frame uses relative pcs. 56 return pc + memory_.cur_offset() - 4; 57 } 58 59 bool EhFrameInit(uint64_t offset, uint64_t size, int64_t section_bias); 60 bool Init(uint64_t offset, uint64_t size, int64_t section_bias) override; 61 62 const DwarfFde* GetFdeFromPc(uint64_t pc) override; 63 64 bool GetFdeOffsetFromPc(uint64_t pc, uint64_t* fde_offset); 65 66 const FdeInfo* GetFdeInfoFromIndex(size_t index); 67 68 void GetFdes(std::vector<const DwarfFde*>* fdes) override; 69 70 protected: 71 uint8_t version_ = 0; 72 uint8_t table_encoding_ = 0; 73 size_t table_entry_size_ = 0; 74 75 uint64_t hdr_entries_offset_ = 0; 76 uint64_t hdr_entries_data_offset_ = 0; 77 uint64_t hdr_section_bias_ = 0; 78 79 uint64_t fde_count_ = 0; 80 std::unordered_map<uint64_t, FdeInfo> fde_info_; 81 }; 82 83 } // namespace unwindstack 84