1 //===-- RuntimeDyldELF.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // ELF support for MC-JIT runtime dynamic linker.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_RUNTIME_DYLD_ELF_H
15 #define LLVM_RUNTIME_DYLD_ELF_H
17 #include "RuntimeDyldImpl.h"
18 #include "llvm/ADT/DenseMap.h"
25 // Helper for extensive error checking in debug builds.
26 error_code Check(error_code Err) {
28 report_fatal_error(Err.message());
32 } // end anonymous namespace
34 class 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);
39 void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset,
40 uint64_t Value, uint32_t Type, int64_t Addend,
43 void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset,
44 uint32_t Value, uint32_t Type, int32_t Addend);
46 void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset,
47 uint64_t Value, uint32_t Type, int64_t Addend);
49 void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset,
50 uint32_t Value, uint32_t Type, int32_t Addend);
52 void resolveMIPSRelocation(const SectionEntry &Section, uint64_t Offset,
53 uint32_t Value, uint32_t Type, int32_t Addend);
55 void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset,
56 uint64_t Value, uint32_t Type, int64_t Addend);
58 void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset,
59 uint64_t Value, uint32_t Type, int64_t Addend);
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)
69 else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le)
71 else if (Arch == Triple::x86_64)
72 return 6; // 2-byte jmp instruction + 32-bit relative address
73 else if (Arch == Triple::systemz)
79 unsigned getStubAlignment() override {
80 if (Arch == Triple::systemz)
86 uint64_t findPPC64TOC() const;
87 void findOPDEntrySection(ObjectImage &Obj, ObjSectionToIDMap &LocalSections,
88 RelocationValueRef &Rel);
90 uint64_t findGOTEntry(uint64_t LoadAddr, uint64_t Offset);
91 size_t getGOTEntrySize();
93 void updateGOTEntries(StringRef Name, uint64_t Addr) override;
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.
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;
108 RuntimeDyldELF(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
110 void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override;
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();
123 static ObjectImage *createObjectImage(ObjectBuffer *InputBuffer);
124 static ObjectImage *createObjectImageFromFile(std::unique_ptr<object::ObjectFile> Obj);
127 } // end namespace llvm