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 23 #include <unwindstack/DwarfSection.h> 24 #include <unwindstack/Memory.h> 25 26 namespace unwindstack { 27 28 template <typename AddressType> 29 class DwarfEhFrame : public DwarfSectionImpl<AddressType> { 30 public: DwarfEhFrame(std::shared_ptr<Memory> & memory)31 DwarfEhFrame(std::shared_ptr<Memory>& memory) : DwarfSectionImpl<AddressType>(memory) {} 32 virtual ~DwarfEhFrame() = default; 33 GetCieOffsetFromFde32(uint32_t pointer)34 uint64_t GetCieOffsetFromFde32(uint32_t pointer) override { 35 return this->memory_.cur_offset() - pointer - 4; 36 } 37 GetCieOffsetFromFde64(uint64_t pointer)38 uint64_t GetCieOffsetFromFde64(uint64_t pointer) override { 39 return this->memory_.cur_offset() - pointer - 8; 40 } 41 AdjustPcFromFde(uint64_t pc)42 uint64_t AdjustPcFromFde(uint64_t pc) override { 43 // The eh_frame uses relative pcs. 44 return pc + this->memory_.cur_offset() - 4; 45 } 46 }; 47 48 } // namespace unwindstack 49