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 "mcld/LD/EhFrame.h" 13 #include "mcld/Support/FileOutputBuffer.h" 14 15 #include <cassert> 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 public: 37 EhFrameHdr(LDSection& pEhFrameHdr, const LDSection& pEhFrame); 38 39 ~EhFrameHdr(); 40 41 /// sizeOutput - base on the fde count to size output 42 void sizeOutput(); 43 44 /// emitOutput - write out eh_frame_hdr 45 template <size_t size> emitOutput(FileOutputBuffer & pOutput)46 void emitOutput(FileOutputBuffer& pOutput) { 47 assert(false && "Call invalid EhFrameHdr::emitOutput"); 48 } 49 50 private: 51 /// computePCBegin - return the address of FDE's pc 52 uint32_t computePCBegin(const EhFrame::FDE& pFDE, 53 const MemoryRegion& pEhFrameRegion); 54 55 private: 56 /// .eh_frame_hdr section 57 LDSection& m_EhFrameHdr; 58 59 /// eh_frame 60 const LDSection& m_EhFrame; 61 }; 62 63 //===----------------------------------------------------------------------===// 64 // Template Specification Functions 65 //===----------------------------------------------------------------------===// 66 /// emitOutput - write out eh_frame_hdr 67 template <> 68 void EhFrameHdr::emitOutput<32>(FileOutputBuffer& pOutput); 69 70 } // namespace mcld 71 72 #endif // MCLD_LD_EHFRAMEHDR_H_ 73