1 //===- AArch64GOT.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 TARGET_AARCH64_AARCH64GOT_H_ 10 #define TARGET_AARCH64_AARCH64GOT_H_ 11 12 #include "mcld/Support/MemoryRegion.h" 13 #include "mcld/Target/GOT.h" 14 15 #include <llvm/ADT/DenseMap.h> 16 17 #include <vector> 18 19 namespace mcld { 20 21 class LDSection; 22 23 /** \class AArch64GOTEntry 24 * \brief GOT Entry with size of 8 bytes 25 */ 26 class AArch64GOTEntry : public GOT::Entry<8> { 27 public: AArch64GOTEntry(uint64_t pContent,SectionData * pParent)28 AArch64GOTEntry(uint64_t pContent, SectionData* pParent) 29 : GOT::Entry<8>(pContent, pParent) {} 30 }; 31 32 /** \class AArch64GOT 33 * \brief AArch64 Global Offset Table. 34 * 35 * AArch64 GOT integrates traditional .got.plt and .got sections into one. 36 * Traditional .got.plt is placed in the front part of GOT (PLTGOT), and 37 * traditional .got is placed in the rear part of GOT (GOT). When -z now and 38 * -z relro are given, the got section layout will be as below. Otherwise, 39 * there will be two seperated sections, .got and .got.plt. 40 * 41 * This class may be used as .got (with no GOTPLT entry), .got.plt (with only 42 * GOTPLT entries) or .got (with GOTPLT and normal GOT entries) 43 * 44 * AArch64 .got 45 * +--------------+ 46 * | GOT0 | 47 * +--------------+ 48 * | GOTPLT | 49 * +--------------+ 50 * | GOT | 51 * +--------------+ 52 * 53 */ 54 class AArch64GOT : public GOT { 55 public: 56 explicit AArch64GOT(LDSection& pSection); 57 58 ~AArch64GOT(); 59 60 /// createGOT0 - create the defualt GOT0 entries. This function called when 61 /// it's a .got section (with GOTPLT entries and normal GOT entry) or it's a 62 /// .got.plt section 63 void createGOT0(); 64 65 AArch64GOTEntry* createGOT(); 66 AArch64GOTEntry* createGOTPLT(); 67 68 void finalizeSectionSize(); 69 70 uint64_t emit(MemoryRegion& pRegion); 71 72 void applyGOT0(uint64_t pAddress); 73 74 void applyGOTPLT(uint64_t pPLTBase); 75 76 bool hasGOT1() const; 77 78 private: 79 typedef std::vector<AArch64GOTEntry*> EntryListType; 80 typedef EntryListType::iterator entry_iterator; 81 typedef EntryListType::const_iterator const_entry_iterator; 82 83 private: 84 AArch64GOTEntry* m_pGOTPLTFront; 85 AArch64GOTEntry* m_pGOTFront; 86 87 /// m_GOTPLTEntries - a list of gotplt entries 88 EntryListType m_GOTPLT; 89 90 /// m_GOTEntris - a list of got entries 91 EntryListType m_GOT; 92 }; 93 94 } // namespace mcld 95 96 #endif // TARGET_AARCH64_AARCH64GOT_H_ 97