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_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H 15 #define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H 16 17 #include "RuntimeDyldImpl.h" 18 #include "llvm/ADT/DenseMap.h" 19 20 using namespace llvm; 21 22 namespace llvm { 23 24 class RuntimeDyldELF : public RuntimeDyldImpl { 25 26 void resolveRelocation(const SectionEntry &Section, uint64_t Offset, 27 uint64_t Value, uint32_t Type, int64_t Addend, 28 uint64_t SymOffset = 0); 29 30 void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset, 31 uint64_t Value, uint32_t Type, int64_t Addend, 32 uint64_t SymOffset); 33 34 void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset, 35 uint32_t Value, uint32_t Type, int32_t Addend); 36 37 void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset, 38 uint64_t Value, uint32_t Type, int64_t Addend); 39 40 void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset, 41 uint32_t Value, uint32_t Type, int32_t Addend); 42 43 void resolveMIPSRelocation(const SectionEntry &Section, uint64_t Offset, 44 uint32_t Value, uint32_t Type, int32_t Addend); 45 46 void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset, 47 uint64_t Value, uint32_t Type, int64_t Addend); 48 49 void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset, 50 uint64_t Value, uint32_t Type, int64_t Addend); 51 52 unsigned getMaxStubSize() override { 53 if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be) 54 return 20; // movz; movk; movk; movk; br 55 if (Arch == Triple::arm || Arch == Triple::thumb) 56 return 8; // 32-bit instruction and 32-bit address 57 else if (Arch == Triple::mipsel || Arch == Triple::mips) 58 return 16; 59 else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) 60 return 44; 61 else if (Arch == Triple::x86_64) 62 return 6; // 2-byte jmp instruction + 32-bit relative address 63 else if (Arch == Triple::systemz) 64 return 16; 65 else 66 return 0; 67 } 68 69 unsigned getStubAlignment() override { 70 if (Arch == Triple::systemz) 71 return 8; 72 else 73 return 1; 74 } 75 76 void findPPC64TOCSection(const ObjectFile &Obj, 77 ObjSectionToIDMap &LocalSections, 78 RelocationValueRef &Rel); 79 void findOPDEntrySection(const ObjectFile &Obj, 80 ObjSectionToIDMap &LocalSections, 81 RelocationValueRef &Rel); 82 83 size_t getGOTEntrySize(); 84 85 SectionEntry &getSection(unsigned SectionID) { return Sections[SectionID]; } 86 87 // Allocate no GOT entries for use in the given section. 88 uint64_t allocateGOTEntries(unsigned SectionID, unsigned no); 89 90 // Resolve the relvative address of GOTOffset in Section ID and place 91 // it at the given Offset 92 void resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset, 93 uint64_t GOTOffset); 94 95 // For a GOT entry referenced from SectionID, compute a relocation entry 96 // that will place the final resolved value in the GOT slot 97 RelocationEntry computeGOTOffsetRE(unsigned SectionID, 98 uint64_t GOTOffset, 99 uint64_t SymbolOffset, 100 unsigned Type); 101 102 // The tentative ID for the GOT section 103 unsigned GOTSectionID; 104 105 // Records the current number of allocated slots in the GOT 106 // (This would be equivalent to GOTEntries.size() were it not for relocations 107 // that consume more than one slot) 108 unsigned CurrentGOTIndex; 109 110 // When a module is loaded we save the SectionID of the EH frame section 111 // in a table until we receive a request to register all unregistered 112 // EH frame sections with the memory manager. 113 SmallVector<SID, 2> UnregisteredEHFrameSections; 114 SmallVector<SID, 2> RegisteredEHFrameSections; 115 116 public: 117 RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr, 118 RuntimeDyld::SymbolResolver &Resolver); 119 ~RuntimeDyldELF() override; 120 121 std::unique_ptr<RuntimeDyld::LoadedObjectInfo> 122 loadObject(const object::ObjectFile &O) override; 123 124 void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override; 125 relocation_iterator 126 processRelocationRef(unsigned SectionID, relocation_iterator RelI, 127 const ObjectFile &Obj, 128 ObjSectionToIDMap &ObjSectionToID, 129 StubMap &Stubs) override; 130 bool isCompatibleFile(const object::ObjectFile &Obj) const override; 131 void registerEHFrames() override; 132 void deregisterEHFrames() override; 133 void finalizeLoad(const ObjectFile &Obj, 134 ObjSectionToIDMap &SectionMap) override; 135 }; 136 137 } // end namespace llvm 138 139 #endif 140
