1 //===- EhFrameHdr.h -------------------------------------------------------===// 2 // 3 // The MCLinker Project 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 #ifndef MCLD_EHFRAMEHDR_H 10 #define MCLD_EHFRAMEHDR_H 11 #ifdef ENABLE_UNITTEST 12 #include <gtest.h> 13 #endif 14 #include <mcld/ADT/SizeTraits.h> 15 #include <cassert> 16 17 #include <mcld/LD/EhFrame.h> 18 namespace mcld { 19 20 class LDSection; 21 class MemoryArea; 22 class MemoryRegion; 23 24 /** \class EhFrameHdr 25 * \brief EhFrameHdr represents .eh_frame_hdr section. 26 * 27 * @ref lsb core generic 4.1 28 * .eh_frame_hdr section format 29 * uint8_t : version 30 * uint8_t : eh_frame_ptr_enc 31 * uint8_t : fde_count_enc 32 * uint8_t : table_enc 33 * uint32_t : eh_frame_ptr 34 * uint32_t : fde_count 35 * __________________________ when fde_count > 0 36 * <uint32_t, uint32_t>+ : binary search table 37 */ 38 class EhFrameHdr 39 { 40 public: 41 EhFrameHdr(LDSection& pEhFrameHdr, const LDSection& pEhFrame); 42 43 ~EhFrameHdr(); 44 45 /// sizeOutput - base on the fde count to size output 46 void sizeOutput(); 47 48 /// emitOutput - write out eh_frame_hdr 49 template<size_t size> emitOutput(MemoryArea & pOutput)50 void emitOutput(MemoryArea& pOutput) 51 { assert(false && "Call invalid EhFrameHdr::emitOutput"); } 52 53 private: 54 /// computePCBegin - return the address of FDE's pc 55 /// @ref binutils gold: ehframe.cc:222 56 uint32_t computePCBegin(const EhFrame::FDE& pFDE, const MemoryRegion& pEhFrameRegion); 57 58 private: 59 /// .eh_frame_hdr section 60 LDSection& m_EhFrameHdr; 61 62 /// eh_frame 63 const LDSection& m_EhFrame; 64 }; 65 66 //===----------------------------------------------------------------------===// 67 // Template Specification Functions 68 //===----------------------------------------------------------------------===// 69 /// emitOutput - write out eh_frame_hdr 70 template<> 71 void EhFrameHdr::emitOutput<32>(MemoryArea& pOutput); 72 73 template<> 74 void EhFrameHdr::emitOutput<64>(MemoryArea& pOutput); 75 76 } // namespace of mcld 77 78 #endif 79 80