1 //===-- RuntimeDyldELF.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 // ELF support for MC-JIT runtime dynamic linker. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_RUNTIME_DYLD_ELF_H 15 #define LLVM_RUNTIME_DYLD_ELF_H 16 17 #include "RuntimeDyldImpl.h" 18 #include "llvm/ADT/DenseMap.h" 19 20 using namespace llvm; 21 22 namespace llvm { 23 namespace { 24 // Helper for extensive error checking in debug builds. 25 std::error_code Check(std::error_code Err) { 26 if (Err) { 27 report_fatal_error(Err.message()); 28 } 29 return Err; 30 } 31 } // end anonymous namespace 32 33 class RuntimeDyldELF : public RuntimeDyldImpl { 34 void resolveRelocation(const SectionEntry &Section, uint64_t Offset, 35 uint64_t Value, uint32_t Type, int64_t Addend, 36 uint64_t SymOffset = 0); 37 38 void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset, 39 uint64_t Value, uint32_t Type, int64_t Addend, 40 uint64_t SymOffset); 41 42 void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset, 43 uint32_t Value, uint32_t Type, int32_t Addend); 44 45 void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset, 46 uint64_t Value, uint32_t Type, int64_t Addend); 47 48 void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset, 49 uint32_t Value, uint32_t Type, int32_t Addend); 50 51 void resolveMIPSRelocation(const SectionEntry &Section, uint64_t Offset, 52 uint32_t Value, uint32_t Type, int32_t Addend); 53 54 void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset, 55 uint64_t Value, uint32_t Type, int64_t Addend); 56 57 void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset, 58 uint64_t Value, uint32_t Type, int64_t Addend); 59 60 unsigned getMaxStubSize() override { 61 if (Arch == Triple::aarch64 || Arch == Triple::arm64 || 62 Arch == Triple::aarch64_be || Arch == Triple::arm64_be) 63 return 20; // movz; movk; movk; movk; br 64 if (Arch == Triple::arm || Arch == Triple::thumb) 65 return 8; // 32-bit instruction and 32-bit address 66 else if (Arch == Triple::mipsel || Arch == Triple::mips) 67 return 16; 68 else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) 69 return 44; 70 else if (Arch == Triple::x86_64) 71 return 6; // 2-byte jmp instruction + 32-bit relative address 72 else if (Arch == Triple::systemz) 73 return 16; 74 else 75 return 0; 76 } 77 78 unsigned getStubAlignment() override { 79 if (Arch == Triple::systemz) 80 return 8; 81 else 82 return 1; 83 } 84 85 void findPPC64TOCSection(ObjectImage &Obj, ObjSectionToIDMap &LocalSections, 86 RelocationValueRef &Rel); 87 void findOPDEntrySection(ObjectImage &Obj, ObjSectionToIDMap &LocalSections, 88 RelocationValueRef &Rel); 89 90 uint64_t findGOTEntry(uint64_t LoadAddr, uint64_t Offset); 91 size_t getGOTEntrySize(); 92 93 void updateGOTEntries(StringRef Name, uint64_t Addr) override; 94 95 // Relocation entries for symbols whose position-independent offset is 96 // updated in a global offset table. 97 typedef SmallVector<RelocationValueRef, 2> GOTRelocations; 98 GOTRelocations GOTEntries; // List of entries requiring finalization. 99 SmallVector<std::pair<SID, GOTRelocations>, 8> GOTs; // Allocated tables. 100 101 // When a module is loaded we save the SectionID of the EH frame section 102 // in a table until we receive a request to register all unregistered 103 // EH frame sections with the memory manager. 104 SmallVector<SID, 2> UnregisteredEHFrameSections; 105 SmallVector<SID, 2> RegisteredEHFrameSections; 106 107 public: 108 RuntimeDyldELF(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {} 109 110 void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override; 111 relocation_iterator 112 processRelocationRef(unsigned SectionID, relocation_iterator RelI, 113 ObjectImage &Obj, ObjSectionToIDMap &ObjSectionToID, 114 const SymbolTableMap &Symbols, StubMap &Stubs) override; 115 bool isCompatibleFormat(const ObjectBuffer *Buffer) const override; 116 bool isCompatibleFile(const object::ObjectFile *Buffer) const override; 117 void registerEHFrames() override; 118 void deregisterEHFrames() override; 119 void finalizeLoad(ObjectImage &ObjImg, 120 ObjSectionToIDMap &SectionMap) override; 121 virtual ~RuntimeDyldELF(); 122 123 static ObjectImage *createObjectImage(ObjectBuffer *InputBuffer); 124 static ObjectImage *createObjectImageFromFile(std::unique_ptr<object::ObjectFile> Obj); 125 }; 126 127 } // end namespace llvm 128 129 #endif 130