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//===-- 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_RUNTIME_DYLD_ELF_H
#define LLVM_RUNTIME_DYLD_ELF_H
#include "RuntimeDyldImpl.h"
#include "llvm/ADT/DenseMap.h"
using namespace llvm;
namespace llvm {
namespace {
// Helper for extensive error checking in debug builds.
std::error_code Check(std::error_code Err) {
if (Err) {
report_fatal_error(Err.message());
}
return Err;
}
} // end anonymous namespace
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::arm64 ||
Arch == Triple::aarch64_be || Arch == Triple::arm64_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(ObjectImage &Obj, ObjSectionToIDMap &LocalSections,
RelocationValueRef &Rel);
void findOPDEntrySection(ObjectImage &Obj, ObjSectionToIDMap &LocalSections,
RelocationValueRef &Rel);
uint64_t findGOTEntry(uint64_t LoadAddr, uint64_t Offset);
size_t getGOTEntrySize();
void updateGOTEntries(StringRef Name, uint64_t Addr) override;
// Relocation entries for symbols whose position-independent offset is
// updated in a global offset table.
typedef SmallVector<RelocationValueRef, 2> GOTRelocations;
GOTRelocations GOTEntries; // List of entries requiring finalization.
SmallVector<std::pair<SID, GOTRelocations>, 8> GOTs; // Allocated tables.
// 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(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;
bool isCompatibleFormat(const ObjectBuffer *Buffer) const override;
bool isCompatibleFile(const object::ObjectFile *Buffer) const override;
void registerEHFrames() override;
void deregisterEHFrames() override;
void finalizeLoad(ObjectImage &ObjImg,
ObjSectionToIDMap &SectionMap) override;
virtual ~RuntimeDyldELF();
static ObjectImage *createObjectImage(ObjectBuffer *InputBuffer);
static ObjectImage *createObjectImageFromFile(std::unique_ptr<object::ObjectFile> Obj);
};
} // end namespace llvm
#endif
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