//
//===----------------------------------------------------------------------===//
-#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 {
- bool resolveI386Relocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- bool isPCRel,
- unsigned Type,
- unsigned Size,
- int64_t Addend);
- bool resolveX86_64Relocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- bool isPCRel,
- unsigned Type,
- unsigned Size,
- int64_t Addend);
- bool resolveARMRelocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- bool isPCRel,
- unsigned Type,
- unsigned Size,
- int64_t Addend);
-
- void resolveRelocation(const SectionEntry &Section,
- uint64_t Offset,
- uint64_t Value,
- uint32_t Type,
- int64_t Addend,
- bool isPCRel,
- unsigned Size);
+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) {}
+ 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;
SID TextSID;
SID ExceptTabSID;
// in a table until we receive a request to register all unregistered
// EH frame sections with the memory manager.
SmallVector<EHFrameRelatedSections, 2> UnregisteredEHFrameSections;
-public:
+
RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
- virtual void resolveRelocation(const RelocationEntry &RE, uint64_t Value);
- virtual void processRelocationRef(unsigned SectionID,
- RelocationRef RelI,
- ObjectImage &Obj,
- ObjSectionToIDMap &ObjSectionToID,
- const SymbolTableMap &Symbols,
- StubMap &Stubs);
- virtual bool isCompatibleFormat(const ObjectBuffer *Buffer) const;
- virtual void registerEHFrames();
- virtual void finalizeLoad(ObjSectionToIDMap &SectionMap);
+ /// 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;
+
+public:
+ /// Create an ObjectImage from the given ObjectBuffer.
+ static ObjectImage *createObjectImage(ObjectBuffer *InputBuffer) {
+ return new ObjectImageCommon(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);
+
+ /// Write the least significant 'Size' bytes in 'Value' out at the address
+ /// pointed to by Addr. Check for overflow.
+ bool writeBytesUnaligned(uint8_t *Dst, uint64_t Value, unsigned Size);
+
+ 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); }
+
+public:
+ RuntimeDyldMachOCRTPBase(RTDyldMemoryManager *mm) : RuntimeDyldMachO(mm) {}
+
+ void finalizeLoad(ObjectImage &ObjImg, ObjSectionToIDMap &SectionMap) {
+ unsigned EHFrameSID = RTDYLD_INVALID_SECTION_ID;
+ unsigned TextSID = RTDYLD_INVALID_SECTION_ID;
+ unsigned ExceptTabSID = RTDYLD_INVALID_SECTION_ID;
+ ObjSectionToIDMap::iterator i, e;
+
+ for (i = SectionMap.begin(), e = SectionMap.end(); i != e; ++i) {
+ const SectionRef &Section = i->first;
+ StringRef Name;
+ Section.getName(Name);
+ if (Name == "__eh_frame")
+ EHFrameSID = i->second;
+ else if (Name == "__text")
+ TextSID = i->second;
+ else if (Name == "__gcc_except_tab")
+ ExceptTabSID = i->second;
+ else
+ impl().finalizeSection(ObjImg, i->second, Section);
+ }
+ UnregisteredEHFrameSections.push_back(
+ EHFrameRelatedSections(EHFrameSID, TextSID, ExceptTabSID));
+ }
};
} // end namespace llvm
+#undef DEBUG_TYPE
+
#endif
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