1 //===-- RuntimeDyldMachO.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-=// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // MachO support for MC-JIT runtime dynamic linker. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_RUNTIME_DYLD_MACHO_H 15 #define LLVM_RUNTIME_DYLD_MACHO_H 16 17 #include "ObjectImageCommon.h" 18 #include "RuntimeDyldImpl.h" 19 #include "llvm/ADT/IndexedMap.h" 20 #include "llvm/Object/MachO.h" 21 #include "llvm/Support/Format.h" 22 23 using namespace llvm; 24 using namespace llvm::object; 25 26 namespace llvm { 27 class RuntimeDyldMachO : public RuntimeDyldImpl { 28 private: 29 30 /// Write the least significant 'Size' bytes in 'Value' out at the address 31 /// pointed to by Addr. 32 bool applyRelocationValue(uint8_t *Addr, uint64_t Value, unsigned Size) { 33 for (unsigned i = 0; i < Size; ++i) { 34 *Addr++ = (uint8_t)Value; 35 Value >>= 8; 36 } 37 38 return false; 39 } 40 41 bool resolveI386Relocation(const RelocationEntry &RE, uint64_t Value); 42 bool resolveX86_64Relocation(const RelocationEntry &RE, uint64_t Value); 43 bool resolveARMRelocation(const RelocationEntry &RE, uint64_t Value); 44 bool resolveAArch64Relocation(const RelocationEntry &RE, uint64_t Value); 45 46 // Populate stubs in __jump_table section. 47 void populateJumpTable(MachOObjectFile &Obj, const SectionRef &JTSection, 48 unsigned JTSectionID); 49 50 // Populate __pointers section. 51 void populatePointersSection(MachOObjectFile &Obj, const SectionRef &PTSection, 52 unsigned PTSectionID); 53 54 unsigned getMaxStubSize() override { 55 if (Arch == Triple::arm || Arch == Triple::thumb) 56 return 8; // 32-bit instruction and 32-bit address 57 else if (Arch == Triple::x86_64) 58 return 8; // GOT entry 59 else 60 return 0; 61 } 62 63 unsigned getStubAlignment() override { return 1; } 64 65 relocation_iterator processSECTDIFFRelocation( 66 unsigned SectionID, 67 relocation_iterator RelI, 68 ObjectImage &ObjImg, 69 ObjSectionToIDMap &ObjSectionToID); 70 71 relocation_iterator processI386ScatteredVANILLA( 72 unsigned SectionID, 73 relocation_iterator RelI, 74 ObjectImage &ObjImg, 75 ObjSectionToIDMap &ObjSectionToID); 76 77 struct EHFrameRelatedSections { 78 EHFrameRelatedSections() 79 : EHFrameSID(RTDYLD_INVALID_SECTION_ID), 80 TextSID(RTDYLD_INVALID_SECTION_ID), 81 ExceptTabSID(RTDYLD_INVALID_SECTION_ID) {} 82 EHFrameRelatedSections(SID EH, SID T, SID Ex) 83 : EHFrameSID(EH), TextSID(T), ExceptTabSID(Ex) {} 84 SID EHFrameSID; 85 SID TextSID; 86 SID ExceptTabSID; 87 }; 88 89 // When a module is loaded we save the SectionID of the EH frame section 90 // in a table until we receive a request to register all unregistered 91 // EH frame sections with the memory manager. 92 SmallVector<EHFrameRelatedSections, 2> UnregisteredEHFrameSections; 93 94 public: 95 RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {} 96 97 void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override; 98 relocation_iterator 99 processRelocationRef(unsigned SectionID, relocation_iterator RelI, 100 ObjectImage &Obj, ObjSectionToIDMap &ObjSectionToID, 101 const SymbolTableMap &Symbols, StubMap &Stubs) override; 102 bool isCompatibleFormat(const ObjectBuffer *Buffer) const override; 103 bool isCompatibleFile(const object::ObjectFile *Obj) const override; 104 void registerEHFrames() override; 105 void finalizeLoad(ObjectImage &ObjImg, 106 ObjSectionToIDMap &SectionMap) override; 107 108 static ObjectImage *createObjectImage(ObjectBuffer *Buffer); 109 static ObjectImage * 110 createObjectImageFromFile(std::unique_ptr<object::ObjectFile> InputObject); 111 }; 112 113 } // end namespace llvm 114 115 #endif 116
