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