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 { 28 public: 29 AArch64GOTEntry(uint64_t pContent, SectionData* pParent) 30 : GOT::Entry<8>(pContent, pParent) 31 {} 32 }; 33 34 /** \class AArch64GOT 35 * \brief AArch64 Global Offset Table. 36 * 37 * AArch64 GOT integrates traditional .got.plt and .got sections into one. 38 * Traditional .got.plt is placed in the front part of GOT (PLTGOT), and 39 * traditional .got is placed in the rear part of GOT (GOT). When -z now and 40 * -z relro are given, the got section layout will be as below. Otherwise, 41 * there will be two seperated sections, .got and .got.plt. 42 * 43 * This class may be used as .got (with no GOTPLT entry), .got.plt (with only 44 * GOTPLT entries) or .got (with GOTPLT and normal GOT entries) 45 * 46 * AArch64 .got 47 * +--------------+ 48 * | GOT0 | 49 * +--------------+ 50 * | GOTPLT | 51 * +--------------+ 52 * | GOT | 53 * +--------------+ 54 * 55 */ 56 class AArch64GOT : public GOT 57 { 58 public: 59 AArch64GOT(LDSection &pSection); 60 61 ~AArch64GOT(); 62 63 /// createGOT0 - create the defualt GOT0 entries. This function called when 64 /// it's a .got section (with GOTPLT entries and normal GOT entry) or it's a 65 /// .got.plt section 66 void createGOT0(); 67 68 AArch64GOTEntry* createGOT(); 69 AArch64GOTEntry* createGOTPLT(); 70 71 void finalizeSectionSize(); 72 73 uint64_t emit(MemoryRegion& pRegion); 74 75 void applyGOT0(uint64_t pAddress); 76 77 void applyGOTPLT(uint64_t pPLTBase); 78 79 bool hasGOT1() const; 80 81 private: 82 typedef std::vector<AArch64GOTEntry*> EntryListType; 83 typedef EntryListType::iterator entry_iterator; 84 typedef EntryListType::const_iterator const_entry_iterator; 85 86 private: 87 AArch64GOTEntry* m_pGOTPLTFront; 88 AArch64GOTEntry* m_pGOTFront; 89 90 /// m_GOTPLTEntries - a list of gotplt entries 91 EntryListType m_GOTPLT; 92 93 /// m_GOTEntris - a list of got entries 94 EntryListType m_GOT; 95 }; 96 97 } // namespace of mcld 98 99 #endif 100 101