diff options
Diffstat (limited to 'lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h')
| -rw-r--r-- | lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h | 174 |
1 files changed, 112 insertions, 62 deletions
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h index 35f0720..7583474 100644 --- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h +++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h @@ -11,74 +11,33 @@ // //===----------------------------------------------------------------------===// -#ifndef LLVM_RUNTIME_DYLD_MACHO_H -#define LLVM_RUNTIME_DYLD_MACHO_H +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDMACHO_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDMACHO_H #include "ObjectImageCommon.h" #include "RuntimeDyldImpl.h" -#include "llvm/ADT/IndexedMap.h" #include "llvm/Object/MachO.h" #include "llvm/Support/Format.h" +#define DEBUG_TYPE "dyld" + using namespace llvm; using namespace llvm::object; namespace llvm { class RuntimeDyldMachO : public RuntimeDyldImpl { -private: - - /// Write the least significant 'Size' bytes in 'Value' out at the address - /// pointed to by Addr. - bool applyRelocationValue(uint8_t *Addr, uint64_t Value, unsigned Size) { - for (unsigned i = 0; i < Size; ++i) { - *Addr++ = (uint8_t)Value; - Value >>= 8; - } - - return false; - } - - bool resolveI386Relocation(const RelocationEntry &RE, uint64_t Value); - bool resolveX86_64Relocation(const RelocationEntry &RE, uint64_t Value); - bool resolveARMRelocation(const RelocationEntry &RE, uint64_t Value); - bool resolveAArch64Relocation(const RelocationEntry &RE, uint64_t Value); - - // Populate stubs in __jump_table section. - void populateJumpTable(MachOObjectFile &Obj, const SectionRef &JTSection, - unsigned JTSectionID); - - // Populate __pointers section. - void populatePointersSection(MachOObjectFile &Obj, const SectionRef &PTSection, - unsigned PTSectionID); - - unsigned getMaxStubSize() override { - if (Arch == Triple::arm || Arch == Triple::thumb) - return 8; // 32-bit instruction and 32-bit address - else if (Arch == Triple::x86_64) - return 8; // GOT entry - else - return 0; - } - - unsigned getStubAlignment() override { return 1; } - - relocation_iterator processSECTDIFFRelocation( - unsigned SectionID, - relocation_iterator RelI, - ObjectImage &ObjImg, - ObjSectionToIDMap &ObjSectionToID); - - relocation_iterator processI386ScatteredVANILLA( - unsigned SectionID, - relocation_iterator RelI, - ObjectImage &ObjImg, - ObjSectionToIDMap &ObjSectionToID); +protected: + struct SectionOffsetPair { + unsigned SectionID; + uint64_t Offset; + }; struct EHFrameRelatedSections { EHFrameRelatedSections() : EHFrameSID(RTDYLD_INVALID_SECTION_ID), TextSID(RTDYLD_INVALID_SECTION_ID), ExceptTabSID(RTDYLD_INVALID_SECTION_ID) {} + EHFrameRelatedSections(SID EH, SID T, SID Ex) : EHFrameSID(EH), TextSID(T), ExceptTabSID(Ex) {} SID EHFrameSID; @@ -91,25 +50,116 @@ private: // EH frame sections with the memory manager. SmallVector<EHFrameRelatedSections, 2> UnregisteredEHFrameSections; -public: RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {} - void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override; - relocation_iterator - processRelocationRef(unsigned SectionID, relocation_iterator RelI, - ObjectImage &Obj, ObjSectionToIDMap &ObjSectionToID, - const SymbolTableMap &Symbols, StubMap &Stubs) override; + /// This convenience method uses memcpy to extract a contiguous addend (the + /// addend size and offset are taken from the corresponding fields of the RE). + int64_t memcpyAddend(const RelocationEntry &RE) const; + + /// Given a relocation_iterator for a non-scattered relocation, construct a + /// RelocationEntry and fill in the common fields. The 'Addend' field is *not* + /// filled in, since immediate encodings are highly target/opcode specific. + /// For targets/opcodes with simple, contiguous immediates (e.g. X86) the + /// memcpyAddend method can be used to read the immediate. + RelocationEntry getRelocationEntry(unsigned SectionID, ObjectImage &ObjImg, + const relocation_iterator &RI) const { + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile &>(*ObjImg.getObjectFile()); + MachO::any_relocation_info RelInfo = + Obj.getRelocation(RI->getRawDataRefImpl()); + + bool IsPCRel = Obj.getAnyRelocationPCRel(RelInfo); + unsigned Size = Obj.getAnyRelocationLength(RelInfo); + uint64_t Offset; + RI->getOffset(Offset); + MachO::RelocationInfoType RelType = + static_cast<MachO::RelocationInfoType>(Obj.getAnyRelocationType(RelInfo)); + + return RelocationEntry(SectionID, Offset, RelType, 0, IsPCRel, Size); + } + + /// Construct a RelocationValueRef representing the relocation target. + /// For Symbols in known sections, this will return a RelocationValueRef + /// representing a (SectionID, Offset) pair. + /// For Symbols whose section is not known, this will return a + /// (SymbolName, Offset) pair, where the Offset is taken from the instruction + /// immediate (held in RE.Addend). + /// In both cases the Addend field is *NOT* fixed up to be PC-relative. That + /// should be done by the caller where appropriate by calling makePCRel on + /// the RelocationValueRef. + RelocationValueRef getRelocationValueRef(ObjectImage &ObjImg, + const relocation_iterator &RI, + const RelocationEntry &RE, + ObjSectionToIDMap &ObjSectionToID, + const SymbolTableMap &Symbols); + + /// Make the RelocationValueRef addend PC-relative. + void makeValueAddendPCRel(RelocationValueRef &Value, ObjectImage &ObjImg, + const relocation_iterator &RI, + unsigned OffsetToNextPC); + + /// Dump information about the relocation entry (RE) and resolved value. + void dumpRelocationToResolve(const RelocationEntry &RE, uint64_t Value) const; + + // Return a section iterator for the section containing the given address. + static section_iterator getSectionByAddress(const MachOObjectFile &Obj, + uint64_t Addr); + + + // Populate __pointers section. + void populateIndirectSymbolPointersSection(MachOObjectFile &Obj, + const SectionRef &PTSection, + unsigned PTSectionID); + +public: + /// Create an ObjectImage from the given ObjectBuffer. + static std::unique_ptr<ObjectImage> + createObjectImage(std::unique_ptr<ObjectBuffer> InputBuffer) { + return llvm::make_unique<ObjectImageCommon>(std::move(InputBuffer)); + } + + /// Create an ObjectImage from the given ObjectFile. + static ObjectImage * + createObjectImageFromFile(std::unique_ptr<object::ObjectFile> InputObject) { + return new ObjectImageCommon(std::move(InputObject)); + } + + /// Create a RuntimeDyldMachO instance for the given target architecture. + static std::unique_ptr<RuntimeDyldMachO> create(Triple::ArchType Arch, + RTDyldMemoryManager *mm); + + SectionEntry &getSection(unsigned SectionID) { return Sections[SectionID]; } + bool isCompatibleFormat(const ObjectBuffer *Buffer) const override; bool isCompatibleFile(const object::ObjectFile *Obj) const override; - void registerEHFrames() override; +}; + +/// RuntimeDyldMachOTarget - Templated base class for generic MachO linker +/// algorithms and data structures. +/// +/// Concrete, target specific sub-classes can be accessed via the impl() +/// methods. (i.e. the RuntimeDyldMachO hierarchy uses the Curiously +/// Recurring Template Idiom). Concrete subclasses for each target +/// can be found in ./Targets. +template <typename Impl> +class RuntimeDyldMachOCRTPBase : public RuntimeDyldMachO { +private: + Impl &impl() { return static_cast<Impl &>(*this); } + const Impl &impl() const { return static_cast<const Impl &>(*this); } + + unsigned char *processFDE(unsigned char *P, int64_t DeltaForText, + int64_t DeltaForEH); + +public: + RuntimeDyldMachOCRTPBase(RTDyldMemoryManager *mm) : RuntimeDyldMachO(mm) {} + void finalizeLoad(ObjectImage &ObjImg, ObjSectionToIDMap &SectionMap) override; - - static ObjectImage *createObjectImage(ObjectBuffer *Buffer); - static ObjectImage * - createObjectImageFromFile(std::unique_ptr<object::ObjectFile> InputObject); + void registerEHFrames() override; }; } // end namespace llvm +#undef DEBUG_TYPE + #endif |