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,
40 uint64_t SymOffset=0);
42 void resolveX86_64Relocation(const SectionEntry &Section,
49 void resolveX86Relocation(const SectionEntry &Section,
55 void resolveAArch64Relocation(const SectionEntry &Section,
61 void resolveARMRelocation(const SectionEntry &Section,
67 void resolveMIPSRelocation(const SectionEntry &Section,
73 void resolvePPC64Relocation(const SectionEntry &Section,
79 void resolveSystemZRelocation(const SectionEntry &Section,
85 unsigned getMaxStubSize() {
86 if (Arch == Triple::aarch64)
87 return 20; // movz; movk; movk; movk; br
88 if (Arch == Triple::arm || Arch == Triple::thumb)
89 return 8; // 32-bit instruction and 32-bit address
90 else if (Arch == Triple::mipsel || Arch == Triple::mips)
92 else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le)
94 else if (Arch == Triple::x86_64)
95 return 6; // 2-byte jmp instruction + 32-bit relative address
96 else if (Arch == Triple::systemz)
102 unsigned getStubAlignment() {
103 if (Arch == Triple::systemz)
109 uint64_t findPPC64TOC() const;
110 void findOPDEntrySection(ObjectImage &Obj,
111 ObjSectionToIDMap &LocalSections,
112 RelocationValueRef &Rel);
114 uint64_t findGOTEntry(uint64_t LoadAddr, uint64_t Offset);
115 size_t getGOTEntrySize();
117 virtual void updateGOTEntries(StringRef Name, uint64_t Addr);
119 // Relocation entries for symbols whose position-independant offset is
120 // updated in a global offset table.
121 typedef SmallVector<RelocationValueRef, 2> GOTRelocations;
122 GOTRelocations GOTEntries; // List of entries requiring finalization.
123 SmallVector<std::pair<SID, GOTRelocations>, 8> GOTs; // Allocated tables.
125 // When a module is loaded we save the SectionID of the EH frame section
126 // in a table until we receive a request to register all unregistered
127 // EH frame sections with the memory manager.
128 SmallVector<SID, 2> UnregisteredEHFrameSections;
129 SmallVector<SID, 2> RegisteredEHFrameSections;
132 RuntimeDyldELF(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm)
135 virtual void resolveRelocation(const RelocationEntry &RE, uint64_t Value);
136 virtual void processRelocationRef(unsigned SectionID,
139 ObjSectionToIDMap &ObjSectionToID,
140 const SymbolTableMap &Symbols,
142 virtual bool isCompatibleFormat(const ObjectBuffer *Buffer) const;
143 virtual ObjectImage *createObjectImage(ObjectBuffer *InputBuffer);
144 virtual void registerEHFrames();
145 virtual void deregisterEHFrames();
146 virtual void finalizeLoad(ObjSectionToIDMap &SectionMap);
147 virtual ~RuntimeDyldELF();
150 } // end namespace llvm