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_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
15 #define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
17 #include "RuntimeDyldImpl.h"
18 #include "llvm/ADT/DenseMap.h"
24 // Helper for extensive error checking in debug builds.
25 std::error_code Check(std::error_code Err) {
27 report_fatal_error(Err.message());
31 } // end anonymous namespace
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);
38 void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset,
39 uint64_t Value, uint32_t Type, int64_t Addend,
42 void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset,
43 uint32_t Value, uint32_t Type, int32_t Addend);
45 void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset,
46 uint64_t Value, uint32_t Type, int64_t Addend);
48 void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset,
49 uint32_t Value, uint32_t Type, int32_t Addend);
51 void resolveMIPSRelocation(const SectionEntry &Section, uint64_t Offset,
52 uint32_t Value, uint32_t Type, int32_t Addend);
54 void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset,
55 uint64_t Value, uint32_t Type, int64_t Addend);
57 void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset,
58 uint64_t Value, uint32_t Type, int64_t Addend);
60 unsigned getMaxStubSize() override {
61 if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be)
62 return 20; // movz; movk; movk; movk; br
63 if (Arch == Triple::arm || Arch == Triple::thumb)
64 return 8; // 32-bit instruction and 32-bit address
65 else if (Arch == Triple::mipsel || Arch == Triple::mips)
67 else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le)
69 else if (Arch == Triple::x86_64)
70 return 6; // 2-byte jmp instruction + 32-bit relative address
71 else if (Arch == Triple::systemz)
77 unsigned getStubAlignment() override {
78 if (Arch == Triple::systemz)
84 void findPPC64TOCSection(ObjectImage &Obj, ObjSectionToIDMap &LocalSections,
85 RelocationValueRef &Rel);
86 void findOPDEntrySection(ObjectImage &Obj, ObjSectionToIDMap &LocalSections,
87 RelocationValueRef &Rel);
89 uint64_t findGOTEntry(uint64_t LoadAddr, uint64_t Offset);
90 size_t getGOTEntrySize();
92 void updateGOTEntries(StringRef Name, uint64_t Addr) override;
94 // Relocation entries for symbols whose position-independent offset is
95 // updated in a global offset table.
96 typedef SmallVector<RelocationValueRef, 2> GOTRelocations;
97 GOTRelocations GOTEntries; // List of entries requiring finalization.
98 SmallVector<std::pair<SID, GOTRelocations>, 8> GOTs; // Allocated tables.
100 // When a module is loaded we save the SectionID of the EH frame section
101 // in a table until we receive a request to register all unregistered
102 // EH frame sections with the memory manager.
103 SmallVector<SID, 2> UnregisteredEHFrameSections;
104 SmallVector<SID, 2> RegisteredEHFrameSections;
107 RuntimeDyldELF(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
109 void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override;
111 processRelocationRef(unsigned SectionID, relocation_iterator RelI,
112 ObjectImage &Obj, ObjSectionToIDMap &ObjSectionToID,
113 const SymbolTableMap &Symbols, StubMap &Stubs) override;
114 bool isCompatibleFormat(const ObjectBuffer *Buffer) const override;
115 bool isCompatibleFile(const object::ObjectFile *Buffer) const override;
116 void registerEHFrames() override;
117 void deregisterEHFrames() override;
118 void finalizeLoad(ObjectImage &ObjImg,
119 ObjSectionToIDMap &SectionMap) override;
120 virtual ~RuntimeDyldELF();
122 static ObjectImage *createObjectImage(ObjectBuffer *InputBuffer);
123 static ObjectImage *createObjectImageFromFile(std::unique_ptr<object::ObjectFile> Obj);
126 } // end namespace llvm