1 //===- HexagonPLT.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_HEXAGON_HEXAGONPLT_H 10 #define TARGET_HEXAGON_HEXAGONPLT_H 11 12 #include "HexagonGOT.h" 13 #include "HexagonGOTPLT.h" 14 #include <mcld/Target/GOT.h> 15 #include <mcld/Target/PLT.h> 16 #include <mcld/Support/MemoryRegion.h> 17 18 namespace { 19 20 const uint8_t hexagon_plt0[] = { 21 0x00, 0x40, 0x00, 0x00, // { immext (#0) 22 0x1c, 0xc0, 0x49, 0x6a, // r28 = add (pc, ##GOT0@PCREL) } # address of GOT0 23 0x0e, 0x42, 0x9c, 0xe2, // { r14 -= add (r28, #16) # offset of GOTn from GOTa 24 0x4f, 0x40, 0x9c, 0x91, // r15 = memw (r28 + #8) # object ID at GOT2 25 0x3c, 0xc0, 0x9c, 0x91, // r28 = memw (r28 + #4) }# dynamic link at GOT1 26 0x0e, 0x42, 0x0e, 0x8c, // { r14 = asr (r14, #2) # index of PLTn 27 0x00, 0xc0, 0x9c, 0x52, // jumpr r28 } # call dynamic linker 28 0x00, 0x00, 0x00, 0x00, 29 0x00, 0x00, 0x00, 0x00, 30 0x00, 0x00, 0x00, 0x00, 31 0x00, 0x00, 0x00, 0x00, 32 0x00, 0x00, 0x00, 0x00 33 }; 34 35 const uint8_t hexagon_plt1[] = { 36 0x00, 0x40, 0x00, 0x00, // { immext (#0) 37 0x0e, 0xc0, 0x49, 0x6a, // r14 = add (pc, ##GOTn@PCREL) } # address of GOTn 38 0x1c, 0xc0, 0x8e, 0x91, // r28 = memw (r14) # contents of GOTn 39 0x00, 0xc0, 0x9c, 0x52 // jumpr r28 # call it 40 }; 41 42 } // anonymous namespace 43 44 namespace mcld { 45 46 class GOTEntry; 47 class LinkerConfig; 48 class HexagonPLT1; 49 50 //===----------------------------------------------------------------------===// 51 // HexagonPLT Entry 52 //===----------------------------------------------------------------------===// 53 class HexagonPLT0 : public PLT::Entry<sizeof(hexagon_plt0)> 54 { 55 public: 56 HexagonPLT0(SectionData& pParent); 57 }; 58 59 //===----------------------------------------------------------------------===// 60 // HexagonPLT 61 //===----------------------------------------------------------------------===// 62 /** \class HexagonPLT 63 * \brief Hexagon Procedure Linkage Table 64 */ 65 class HexagonPLT : public PLT 66 { 67 public: 68 HexagonPLT(LDSection& pSection, 69 HexagonGOTPLT& pGOTPLT, 70 const LinkerConfig& pConfig); 71 ~HexagonPLT(); 72 73 // finalizeSectionSize - set LDSection size 74 void finalizeSectionSize(); 75 76 // hasPLT1 - return if this PLT has any PLT1 entry 77 bool hasPLT1() const; 78 79 HexagonPLT1* create(); 80 81 void applyPLT0(); 82 83 void applyPLT1(); 84 85 uint64_t emit(MemoryRegion& pRegion); 86 87 PLTEntryBase* getPLT0() const; 88 89 private: 90 HexagonGOTPLT& m_GOTPLT; 91 92 const uint8_t *m_PLT0; 93 unsigned int m_PLT0Size; 94 95 const LinkerConfig& m_Config; 96 }; 97 98 class HexagonPLT1 : public PLT::Entry<sizeof(hexagon_plt1)> 99 { 100 public: 101 HexagonPLT1(SectionData& pParent); 102 }; 103 104 } // namespace of mcld 105 106 #endif 107 108