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>::last_error_; 38 39 struct FdeInfo { 40 AddressType pc; 41 uint64_t offset; 42 }; 43 DwarfEhFrameWithHdr(Memory * memory)44 DwarfEhFrameWithHdr(Memory* memory) : DwarfSectionImpl<AddressType>(memory) {} 45 virtual ~DwarfEhFrameWithHdr() = default; 46 GetCieOffsetFromFde32(uint32_t pointer)47 uint64_t GetCieOffsetFromFde32(uint32_t pointer) override { 48 return memory_.cur_offset() - pointer - 4; 49 } 50 GetCieOffsetFromFde64(uint64_t pointer)51 uint64_t GetCieOffsetFromFde64(uint64_t pointer) override { 52 return memory_.cur_offset() - pointer - 8; 53 } 54 AdjustPcFromFde(uint64_t pc)55 uint64_t AdjustPcFromFde(uint64_t pc) override { 56 // The eh_frame uses relative pcs. 57 return pc + memory_.cur_offset() - 4; 58 } 59 60 bool EhFrameInit(uint64_t offset, uint64_t size, int64_t section_bias); 61 bool Init(uint64_t offset, uint64_t size, int64_t section_bias) override; 62 63 const DwarfFde* GetFdeFromPc(uint64_t pc) override; 64 65 bool GetFdeOffsetFromPc(uint64_t pc, uint64_t* fde_offset); 66 67 const FdeInfo* GetFdeInfoFromIndex(size_t index); 68 69 void GetFdes(std::vector<const DwarfFde*>* fdes) override; 70 71 protected: 72 uint8_t version_ = 0; 73 uint8_t table_encoding_ = 0; 74 size_t table_entry_size_ = 0; 75 76 uint64_t hdr_entries_offset_ = 0; 77 uint64_t hdr_entries_data_offset_ = 0; 78 uint64_t hdr_section_bias_ = 0; 79 80 uint64_t fde_count_ = 0; 81 std::unordered_map<uint64_t, FdeInfo> fde_info_; 82 }; 83 84 } // namespace unwindstack 85 86 #endif // _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H 87