| //===-- RuntimeDyldELF.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // ELF support for MC-JIT runtime dynamic linker. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H |
| #define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H |
| |
| #include "RuntimeDyldImpl.h" |
| #include "llvm/ADT/DenseMap.h" |
| |
| using namespace llvm; |
| |
| namespace llvm { |
| |
| class RuntimeDyldELF : public RuntimeDyldImpl { |
| |
| void resolveRelocation(const SectionEntry &Section, uint64_t Offset, |
| uint64_t Value, uint32_t Type, int64_t Addend, |
| uint64_t SymOffset = 0); |
| |
| void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset, |
| uint64_t Value, uint32_t Type, int64_t Addend, |
| uint64_t SymOffset); |
| |
| void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset, |
| uint32_t Value, uint32_t Type, int32_t Addend); |
| |
| void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset, |
| uint64_t Value, uint32_t Type, int64_t Addend); |
| |
| void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset, |
| uint32_t Value, uint32_t Type, int32_t Addend); |
| |
| void resolveMIPSRelocation(const SectionEntry &Section, uint64_t Offset, |
| uint32_t Value, uint32_t Type, int32_t Addend); |
| |
| void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset, |
| uint64_t Value, uint32_t Type, int64_t Addend); |
| |
| void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset, |
| uint64_t Value, uint32_t Type, int64_t Addend); |
| |
| unsigned getMaxStubSize() override { |
| if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be) |
| return 20; // movz; movk; movk; movk; br |
| if (Arch == Triple::arm || Arch == Triple::thumb) |
| return 8; // 32-bit instruction and 32-bit address |
| else if (Arch == Triple::mipsel || Arch == Triple::mips) |
| return 16; |
| else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) |
| return 44; |
| else if (Arch == Triple::x86_64) |
| return 6; // 2-byte jmp instruction + 32-bit relative address |
| else if (Arch == Triple::systemz) |
| return 16; |
| else |
| return 0; |
| } |
| |
| unsigned getStubAlignment() override { |
| if (Arch == Triple::systemz) |
| return 8; |
| else |
| return 1; |
| } |
| |
| void findPPC64TOCSection(const ObjectFile &Obj, |
| ObjSectionToIDMap &LocalSections, |
| RelocationValueRef &Rel); |
| void findOPDEntrySection(const ObjectFile &Obj, |
| ObjSectionToIDMap &LocalSections, |
| RelocationValueRef &Rel); |
| |
| size_t getGOTEntrySize(); |
| |
| SectionEntry &getSection(unsigned SectionID) { return Sections[SectionID]; } |
| |
| // Allocate no GOT entries for use in the given section. |
| uint64_t allocateGOTEntries(unsigned SectionID, unsigned no); |
| |
| // Resolve the relvative address of GOTOffset in Section ID and place |
| // it at the given Offset |
| void resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset, |
| uint64_t GOTOffset); |
| |
| // For a GOT entry referenced from SectionID, compute a relocation entry |
| // that will place the final resolved value in the GOT slot |
| RelocationEntry computeGOTOffsetRE(unsigned SectionID, |
| uint64_t GOTOffset, |
| uint64_t SymbolOffset, |
| unsigned Type); |
| |
| // The tentative ID for the GOT section |
| unsigned GOTSectionID; |
| |
| // Records the current number of allocated slots in the GOT |
| // (This would be equivalent to GOTEntries.size() were it not for relocations |
| // that consume more than one slot) |
| unsigned CurrentGOTIndex; |
| |
| // When a module is loaded we save the SectionID of the EH frame section |
| // in a table until we receive a request to register all unregistered |
| // EH frame sections with the memory manager. |
| SmallVector<SID, 2> UnregisteredEHFrameSections; |
| SmallVector<SID, 2> RegisteredEHFrameSections; |
| |
| public: |
| RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr, |
| RuntimeDyld::SymbolResolver &Resolver); |
| ~RuntimeDyldELF() override; |
| |
| std::unique_ptr<RuntimeDyld::LoadedObjectInfo> |
| loadObject(const object::ObjectFile &O) override; |
| |
| void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override; |
| relocation_iterator |
| processRelocationRef(unsigned SectionID, relocation_iterator RelI, |
| const ObjectFile &Obj, |
| ObjSectionToIDMap &ObjSectionToID, |
| StubMap &Stubs) override; |
| bool isCompatibleFile(const object::ObjectFile &Obj) const override; |
| void registerEHFrames() override; |
| void deregisterEHFrames() override; |
| void finalizeLoad(const ObjectFile &Obj, |
| ObjSectionToIDMap &SectionMap) override; |
| }; |
| |
| } // end namespace llvm |
| |
| #endif |