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 #ifndef _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H 18 #define _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H 19 20 #include <stdint.h> 21 22 #include <unordered_map> 23 24 #include <unwindstack/DwarfSection.h> 25 26 namespace unwindstack { 27 28 // Forward declarations. 29 class Memory; 30 31 template <typename AddressType> 32 class DwarfEhFrameWithHdr : public DwarfSectionImpl<AddressType> { 33 public: 34 // Add these so that the protected members of DwarfSectionImpl 35 // can be accessed without needing a this->. 36 using DwarfSectionImpl<AddressType>::memory_; 37 using DwarfSectionImpl<AddressType>::pc_offset_; 38 using DwarfSectionImpl<AddressType>::entries_offset_; 39 using DwarfSectionImpl<AddressType>::entries_end_; 40 using DwarfSectionImpl<AddressType>::last_error_; 41 using DwarfSectionImpl<AddressType>::load_bias_; 42 43 struct FdeInfo { 44 AddressType pc; 45 uint64_t offset; 46 }; 47 DwarfEhFrameWithHdr(Memory * memory)48 DwarfEhFrameWithHdr(Memory* memory) : DwarfSectionImpl<AddressType>(memory) {} 49 virtual ~DwarfEhFrameWithHdr() = default; 50 GetCieOffsetFromFde32(uint32_t pointer)51 uint64_t GetCieOffsetFromFde32(uint32_t pointer) override { 52 return this->memory_.cur_offset() - pointer - 4; 53 } 54 GetCieOffsetFromFde64(uint64_t pointer)55 uint64_t GetCieOffsetFromFde64(uint64_t pointer) override { 56 return this->memory_.cur_offset() - pointer - 8; 57 } 58 AdjustPcFromFde(uint64_t pc)59 uint64_t AdjustPcFromFde(uint64_t pc) override { 60 // The eh_frame uses relative pcs. 61 return pc + this->memory_.cur_offset() - 4; 62 } 63 64 bool Init(uint64_t offset, uint64_t size, uint64_t load_bias) override; 65 66 const DwarfFde* GetFdeFromPc(uint64_t pc) override; 67 68 bool GetFdeOffsetFromPc(uint64_t pc, uint64_t* fde_offset); 69 70 const FdeInfo* GetFdeInfoFromIndex(size_t index); 71 72 void GetFdes(std::vector<const DwarfFde*>* fdes) override; 73 74 protected: 75 uint8_t version_; 76 uint8_t ptr_encoding_; 77 uint8_t table_encoding_; 78 size_t table_entry_size_; 79 80 uint64_t ptr_offset_; 81 82 uint64_t entries_data_offset_; 83 uint64_t cur_entries_offset_ = 0; 84 85 uint64_t fde_count_; 86 std::unordered_map<uint64_t, FdeInfo> fde_info_; 87 }; 88 89 } // namespace unwindstack 90 91 #endif // _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H 92