HexagonPLT.h revision f7ac0f19a1c8d0ad14bcf6456ce368b830fea886
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 MCLD_TARGET_HEXAGON_PLT_H 10#define MCLD_TARGET_HEXAGON_PLT_H 11 12#include "HexagonGOT.h" 13#include "HexagonGOTPLT.h" 14#include <mcld/Target/GOT.h> 15#include <mcld/Target/PLT.h> 16 17namespace { 18 19const uint8_t hexagon_plt0[] = { 20 0x00, 0x40, 0x00, 0x00, // { immext (#0) 21 0x1c, 0xc0, 0x49, 0x6a, // r28 = add (pc, ##GOT0@PCREL) } # address of GOT0 22 0x0e, 0x42, 0x9c, 0xe2, // { r14 -= add (r28, #16) # offset of GOTn from GOTa 23 0x4f, 0x40, 0x9c, 0x91, // r15 = memw (r28 + #8) # object ID at GOT2 24 0x3c, 0xc0, 0x9c, 0x91, // r28 = memw (r28 + #4) }# dynamic link at GOT1 25 0x0e, 0x42, 0x0e, 0x8c, // { r14 = asr (r14, #2) # index of PLTn 26 0x00, 0xc0, 0x9c, 0x52, // jumpr r28 } # call dynamic linker 27 0x00, 0x00, 0x00, 0x00, 28 0x00, 0x00, 0x00, 0x00, 29 0x00, 0x00, 0x00, 0x00, 30 0x00, 0x00, 0x00, 0x00, 31 0x00, 0x00, 0x00, 0x00, 32}; 33 34const uint8_t hexagon_plt1[] = { 35 0x00, 0x40, 0x00, 0x00, // { immext (#0) 36 0x0e, 0xc0, 0x49, 0x6a, // r14 = add (pc, ##GOTn@PCREL) } # address of GOTn 37 0x1c, 0xc0, 0x8e, 0x91, // r28 = memw (r14) # contents of GOTn 38 0x00, 0xc0, 0x9c, 0x52, // jumpr r28 # call it 39}; 40 41} // anonymous namespace 42 43namespace mcld { 44 45class GOTEntry; 46class LinkerConfig; 47class MemoryRegion; 48class HexagonPLT1; 49 50//===----------------------------------------------------------------------===// 51// HexagonPLT Entry 52//===----------------------------------------------------------------------===// 53class HexagonPLT0 : public PLT::Entry<sizeof(hexagon_plt0)> 54{ 55public: 56 HexagonPLT0(SectionData& pParent); 57}; 58 59//===----------------------------------------------------------------------===// 60// HexagonPLT 61//===----------------------------------------------------------------------===// 62/** \class HexagonPLT 63 * \brief Hexagon Procedure Linkage Table 64 */ 65class HexagonPLT : public PLT 66{ 67public: 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 void reserveEntry(size_t pNum = 1) ; 80 81 HexagonPLT1* consume(); 82 83 void applyPLT0(); 84 85 void applyPLT1(); 86 87 uint64_t emit(MemoryRegion& pRegion); 88 89 PLTEntryBase* getPLT0() const; 90 91private: 92 HexagonGOTPLT& m_GOTPLT; 93 94 // the last consumed entry. 95 SectionData::iterator m_Last; 96 97 const uint8_t *m_PLT0; 98 unsigned int m_PLT0Size; 99 100 const LinkerConfig& m_Config; 101}; 102 103class HexagonPLT1 : public PLT::Entry<sizeof(hexagon_plt1)> 104{ 105public: 106 HexagonPLT1(SectionData& pParent); 107}; 108 109} // namespace of mcld 110 111#endif 112 113