RuntimeDyldELF.h revision dce4a407a24b04eebc6a376f8e62b41aaa7b071f
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 20using namespace llvm; 21 22namespace llvm { 23 24namespace { 25// Helper for extensive error checking in debug builds. 26error_code Check(error_code Err) { 27 if (Err) { 28 report_fatal_error(Err.message()); 29 } 30 return Err; 31} 32} // end anonymous namespace 33 34class RuntimeDyldELF : public RuntimeDyldImpl { 35 void resolveRelocation(const SectionEntry &Section, uint64_t Offset, 36 uint64_t Value, uint32_t Type, int64_t Addend, 37 uint64_t SymOffset = 0); 38 39 void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset, 40 uint64_t Value, uint32_t Type, int64_t Addend, 41 uint64_t SymOffset); 42 43 void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset, 44 uint32_t Value, uint32_t Type, int32_t Addend); 45 46 void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset, 47 uint64_t Value, uint32_t Type, int64_t Addend); 48 49 void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset, 50 uint32_t Value, uint32_t Type, int32_t Addend); 51 52 void resolveMIPSRelocation(const SectionEntry &Section, uint64_t Offset, 53 uint32_t Value, uint32_t Type, int32_t Addend); 54 55 void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset, 56 uint64_t Value, uint32_t Type, int64_t Addend); 57 58 void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset, 59 uint64_t Value, uint32_t Type, int64_t Addend); 60 61 unsigned getMaxStubSize() override { 62 if (Arch == Triple::aarch64 || Arch == Triple::arm64 || 63 Arch == Triple::aarch64_be || Arch == Triple::arm64_be) 64 return 20; // movz; movk; movk; movk; br 65 if (Arch == Triple::arm || Arch == Triple::thumb) 66 return 8; // 32-bit instruction and 32-bit address 67 else if (Arch == Triple::mipsel || Arch == Triple::mips) 68 return 16; 69 else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) 70 return 44; 71 else if (Arch == Triple::x86_64) 72 return 6; // 2-byte jmp instruction + 32-bit relative address 73 else if (Arch == Triple::systemz) 74 return 16; 75 else 76 return 0; 77 } 78 79 unsigned getStubAlignment() override { 80 if (Arch == Triple::systemz) 81 return 8; 82 else 83 return 1; 84 } 85 86 uint64_t findPPC64TOC() const; 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 107public: 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