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_H 18 #define _LIBUNWINDSTACK_DWARF_EH_FRAME_H 19 20 #include <stdint.h> 21 22 #include <unwindstack/DwarfSection.h> 23 #include <unwindstack/Memory.h> 24 25 namespace unwindstack { 26 27 template <typename AddressType> 28 class DwarfEhFrame : public DwarfSectionImpl<AddressType> { 29 public: 30 DwarfEhFrame(Memory* memory) : DwarfSectionImpl<AddressType>(memory) {} 31 virtual ~DwarfEhFrame() = default; 32 33 uint64_t GetCieOffsetFromFde32(uint32_t pointer) override { 34 return this->memory_.cur_offset() - pointer - 4; 35 } 36 37 uint64_t GetCieOffsetFromFde64(uint64_t pointer) override { 38 return this->memory_.cur_offset() - pointer - 8; 39 } 40 41 uint64_t AdjustPcFromFde(uint64_t pc) override { 42 // The eh_frame uses relative pcs. 43 return pc + this->memory_.cur_offset() - 4; 44 } 45 }; 46 47 } // namespace unwindstack 48 49 #endif // _LIBUNWINDSTACK_DWARF_EH_FRAME_H 50
