1 //===- ARMPLT.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_ARM_PLT_H 10 #define MCLD_ARM_PLT_H 11 12 #include <mcld/Target/GOT.h> 13 #include <mcld/Target/PLT.h> 14 15 namespace { 16 17 const uint32_t arm_plt0[] = { 18 0xe52de004, // str lr, [sp, #-4]! 19 0xe59fe004, // ldr lr, [pc, #4] 20 0xe08fe00e, // add lr, pc, lr 21 0xe5bef008, // ldr pc, [lr, #8]! 22 0x00000000, // &GOT[0] - . 23 }; 24 25 const uint32_t arm_plt1[] = { 26 0xe28fc600, // add ip, pc, #0xNN00000 27 0xe28cca00, // add ip, ip, #0xNN000 28 0xe5bcf000, // ldr pc, [ip, #0xNNN]! 29 }; 30 31 } // anonymous namespace 32 33 namespace mcld { 34 35 class ARMGOT; 36 class MemoryRegion; 37 38 class ARMPLT0 : public PLT::Entry<sizeof(arm_plt0)> 39 { 40 public: 41 ARMPLT0(SectionData& pParent); 42 }; 43 44 class ARMPLT1 : public PLT::Entry<sizeof(arm_plt1)> 45 { 46 public: 47 ARMPLT1(SectionData& pParent); 48 }; 49 50 /** \class ARMPLT 51 * \brief ARM Procedure Linkage Table 52 */ 53 class ARMPLT : public PLT 54 { 55 public: 56 ARMPLT(LDSection& pSection, ARMGOT& pGOTPLT); 57 ~ARMPLT(); 58 59 // finalizeSectionSize - set LDSection size 60 void finalizeSectionSize(); 61 62 // hasPLT1 - return if this plt section has any plt1 entry 63 bool hasPLT1() const; 64 65 void reserveEntry(size_t pNum = 1) ; 66 67 ARMPLT1* consume(); 68 69 ARMPLT0* getPLT0() const; 70 71 void applyPLT0(); 72 73 void applyPLT1(); 74 75 uint64_t emit(MemoryRegion& pRegion); 76 77 private: 78 ARMGOT& m_GOT; 79 80 // Used by getEntry() for mapping a ResolveInfo instance to a PLT1 Entry. 81 iterator m_PLTEntryIterator; 82 }; 83 84 } // namespace of mcld 85 86 #endif 87 88
