//===----------------------------------------------------------------------===//
#include "RuntimeDyldELF.h"
-#include "JITRegistrar.h"
-#include "ObjectImageCommon.h"
+#include "RuntimeDyldCheckerImpl.h"
#include "llvm/ADT/IntervalMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
-#include "llvm/ExecutionEngine/ObjectBuffer.h"
-#include "llvm/ExecutionEngine/ObjectImage.h"
+#include "llvm/MC/MCStreamer.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/ELF.h"
+#include "llvm/Support/Endian.h"
#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
using namespace llvm::object;
#define DEBUG_TYPE "dyld"
-namespace {
-
static inline std::error_code check(std::error_code Err) {
if (Err) {
report_fatal_error(Err.message());
return Err;
}
+namespace {
+
template <class ELFT> class DyldELFObject : public ELFObjectFile<ELFT> {
LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type;
- std::unique_ptr<ObjectFile> UnderlyingFile;
-
public:
- DyldELFObject(std::unique_ptr<ObjectFile> UnderlyingFile,
- MemoryBufferRef Wrapper, std::error_code &ec);
-
DyldELFObject(MemoryBufferRef Wrapper, std::error_code &ec);
void updateSectionAddress(const SectionRef &Sec, uint64_t Addr);
- void updateSymbolAddress(const SymbolRef &Sym, uint64_t Addr);
+
+ void updateSymbolAddress(const SymbolRef &SymRef, uint64_t Addr);
// Methods for type inquiry through isa, cast and dyn_cast
static inline bool classof(const Binary *v) {
}
};
-template <class ELFT> class ELFObjectImage : public ObjectImageCommon {
- bool Registered;
-
-public:
- ELFObjectImage(ObjectBuffer *Input, std::unique_ptr<DyldELFObject<ELFT>> Obj)
- : ObjectImageCommon(Input, std::move(Obj)), Registered(false) {}
-
- virtual ~ELFObjectImage() {
- if (Registered)
- deregisterWithDebugger();
- }
-
- // Subclasses can override these methods to update the image with loaded
- // addresses for sections and common symbols
- void updateSectionAddress(const SectionRef &Sec, uint64_t Addr) override {
- static_cast<DyldELFObject<ELFT>*>(getObjectFile())
- ->updateSectionAddress(Sec, Addr);
- }
- void updateSymbolAddress(const SymbolRef &Sym, uint64_t Addr) override {
- static_cast<DyldELFObject<ELFT>*>(getObjectFile())
- ->updateSymbolAddress(Sym, Addr);
- }
-
- void registerWithDebugger() override {
- JITRegistrar::getGDBRegistrar().registerObject(*Buffer);
- Registered = true;
- }
- void deregisterWithDebugger() override {
- JITRegistrar::getGDBRegistrar().deregisterObject(*Buffer);
- }
-};
// The MemoryBuffer passed into this constructor is just a wrapper around the
// actual memory. Ultimately, the Binary parent class will take ownership of
this->isDyldELFObject = true;
}
-template <class ELFT>
-DyldELFObject<ELFT>::DyldELFObject(std::unique_ptr<ObjectFile> UnderlyingFile,
- MemoryBufferRef Wrapper, std::error_code &EC)
- : ELFObjectFile<ELFT>(Wrapper, EC),
- UnderlyingFile(std::move(UnderlyingFile)) {
- this->isDyldELFObject = true;
-}
-
template <class ELFT>
void DyldELFObject<ELFT>::updateSectionAddress(const SectionRef &Sec,
uint64_t Addr) {
sym->st_value = static_cast<addr_type>(Addr);
}
-} // namespace
+class LoadedELFObjectInfo final
+ : public RuntimeDyld::LoadedObjectInfoHelper<LoadedELFObjectInfo> {
+public:
+ LoadedELFObjectInfo(RuntimeDyldImpl &RTDyld, ObjSectionToIDMap ObjSecToIDMap)
+ : LoadedObjectInfoHelper(RTDyld, std::move(ObjSecToIDMap)) {}
+
+ OwningBinary<ObjectFile>
+ getObjectForDebug(const ObjectFile &Obj) const override;
+};
+
+template <typename ELFT>
+std::unique_ptr<DyldELFObject<ELFT>>
+createRTDyldELFObject(MemoryBufferRef Buffer,
+ const ObjectFile &SourceObject,
+ const LoadedELFObjectInfo &L,
+ std::error_code &ec) {
+ typedef typename ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
+ typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type;
+
+ std::unique_ptr<DyldELFObject<ELFT>> Obj =
+ llvm::make_unique<DyldELFObject<ELFT>>(Buffer, ec);
+
+ // Iterate over all sections in the object.
+ auto SI = SourceObject.section_begin();
+ for (const auto &Sec : Obj->sections()) {
+ StringRef SectionName;
+ Sec.getName(SectionName);
+ if (SectionName != "") {
+ DataRefImpl ShdrRef = Sec.getRawDataRefImpl();
+ Elf_Shdr *shdr = const_cast<Elf_Shdr *>(
+ reinterpret_cast<const Elf_Shdr *>(ShdrRef.p));
+
+ if (uint64_t SecLoadAddr = L.getSectionLoadAddress(*SI)) {
+ // This assumes that the address passed in matches the target address
+ // bitness. The template-based type cast handles everything else.
+ shdr->sh_addr = static_cast<addr_type>(SecLoadAddr);
+ }
+ }
+ ++SI;
+ }
+
+ return Obj;
+}
+
+OwningBinary<ObjectFile> createELFDebugObject(const ObjectFile &Obj,
+ const LoadedELFObjectInfo &L) {
+ assert(Obj.isELF() && "Not an ELF object file.");
+
+ std::unique_ptr<MemoryBuffer> Buffer =
+ MemoryBuffer::getMemBufferCopy(Obj.getData(), Obj.getFileName());
+
+ std::error_code ec;
+
+ std::unique_ptr<ObjectFile> DebugObj;
+ if (Obj.getBytesInAddress() == 4 && Obj.isLittleEndian()) {
+ typedef ELFType<support::little, false> ELF32LE;
+ DebugObj = createRTDyldELFObject<ELF32LE>(Buffer->getMemBufferRef(), Obj, L,
+ ec);
+ } else if (Obj.getBytesInAddress() == 4 && !Obj.isLittleEndian()) {
+ typedef ELFType<support::big, false> ELF32BE;
+ DebugObj = createRTDyldELFObject<ELF32BE>(Buffer->getMemBufferRef(), Obj, L,
+ ec);
+ } else if (Obj.getBytesInAddress() == 8 && !Obj.isLittleEndian()) {
+ typedef ELFType<support::big, true> ELF64BE;
+ DebugObj = createRTDyldELFObject<ELF64BE>(Buffer->getMemBufferRef(), Obj, L,
+ ec);
+ } else if (Obj.getBytesInAddress() == 8 && Obj.isLittleEndian()) {
+ typedef ELFType<support::little, true> ELF64LE;
+ DebugObj = createRTDyldELFObject<ELF64LE>(Buffer->getMemBufferRef(), Obj, L,
+ ec);
+ } else
+ llvm_unreachable("Unexpected ELF format");
+
+ assert(!ec && "Could not construct copy ELF object file");
+
+ return OwningBinary<ObjectFile>(std::move(DebugObj), std::move(Buffer));
+}
+
+OwningBinary<ObjectFile>
+LoadedELFObjectInfo::getObjectForDebug(const ObjectFile &Obj) const {
+ return createELFDebugObject(Obj, *this);
+}
+
+} // anonymous namespace
namespace llvm {
+RuntimeDyldELF::RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr,
+ RuntimeDyld::SymbolResolver &Resolver)
+ : RuntimeDyldImpl(MemMgr, Resolver), GOTSectionID(0), CurrentGOTIndex(0) {}
+RuntimeDyldELF::~RuntimeDyldELF() {}
+
void RuntimeDyldELF::registerEHFrames() {
- if (!MemMgr)
- return;
for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) {
SID EHFrameSID = UnregisteredEHFrameSections[i];
uint8_t *EHFrameAddr = Sections[EHFrameSID].Address;
uint64_t EHFrameLoadAddr = Sections[EHFrameSID].LoadAddress;
size_t EHFrameSize = Sections[EHFrameSID].Size;
- MemMgr->registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
+ MemMgr.registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
RegisteredEHFrameSections.push_back(EHFrameSID);
}
UnregisteredEHFrameSections.clear();
}
void RuntimeDyldELF::deregisterEHFrames() {
- if (!MemMgr)
- return;
for (int i = 0, e = RegisteredEHFrameSections.size(); i != e; ++i) {
SID EHFrameSID = RegisteredEHFrameSections[i];
uint8_t *EHFrameAddr = Sections[EHFrameSID].Address;
uint64_t EHFrameLoadAddr = Sections[EHFrameSID].LoadAddress;
size_t EHFrameSize = Sections[EHFrameSID].Size;
- MemMgr->deregisterEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
+ MemMgr.deregisterEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
}
RegisteredEHFrameSections.clear();
}
-ObjectImage *
-RuntimeDyldELF::createObjectImageFromFile(std::unique_ptr<object::ObjectFile> ObjFile) {
- if (!ObjFile)
- return nullptr;
-
- std::error_code ec;
- MemoryBufferRef Buffer = ObjFile->getMemoryBufferRef();
-
- if (ObjFile->getBytesInAddress() == 4 && ObjFile->isLittleEndian()) {
- auto Obj =
- llvm::make_unique<DyldELFObject<ELFType<support::little, 2, false>>>(
- std::move(ObjFile), Buffer, ec);
- return new ELFObjectImage<ELFType<support::little, 2, false>>(
- nullptr, std::move(Obj));
- } else if (ObjFile->getBytesInAddress() == 4 && !ObjFile->isLittleEndian()) {
- auto Obj =
- llvm::make_unique<DyldELFObject<ELFType<support::big, 2, false>>>(
- std::move(ObjFile), Buffer, ec);
- return new ELFObjectImage<ELFType<support::big, 2, false>>(nullptr, std::move(Obj));
- } else if (ObjFile->getBytesInAddress() == 8 && !ObjFile->isLittleEndian()) {
- auto Obj = llvm::make_unique<DyldELFObject<ELFType<support::big, 2, true>>>(
- std::move(ObjFile), Buffer, ec);
- return new ELFObjectImage<ELFType<support::big, 2, true>>(nullptr,
- std::move(Obj));
- } else if (ObjFile->getBytesInAddress() == 8 && ObjFile->isLittleEndian()) {
- auto Obj =
- llvm::make_unique<DyldELFObject<ELFType<support::little, 2, true>>>(
- std::move(ObjFile), Buffer, ec);
- return new ELFObjectImage<ELFType<support::little, 2, true>>(
- nullptr, std::move(Obj));
- } else
- llvm_unreachable("Unexpected ELF format");
-}
-
-ObjectImage *RuntimeDyldELF::createObjectImage(ObjectBuffer *Buffer) {
- if (Buffer->getBufferSize() < ELF::EI_NIDENT)
- llvm_unreachable("Unexpected ELF object size");
- std::pair<unsigned char, unsigned char> Ident =
- std::make_pair((uint8_t)Buffer->getBufferStart()[ELF::EI_CLASS],
- (uint8_t)Buffer->getBufferStart()[ELF::EI_DATA]);
- std::error_code ec;
-
- MemoryBufferRef Buf = Buffer->getMemBuffer();
-
- if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) {
- auto Obj =
- llvm::make_unique<DyldELFObject<ELFType<support::little, 4, false>>>(
- Buf, ec);
- return new ELFObjectImage<ELFType<support::little, 4, false>>(
- Buffer, std::move(Obj));
- } else if (Ident.first == ELF::ELFCLASS32 &&
- Ident.second == ELF::ELFDATA2MSB) {
- auto Obj =
- llvm::make_unique<DyldELFObject<ELFType<support::big, 4, false>>>(Buf,
- ec);
- return new ELFObjectImage<ELFType<support::big, 4, false>>(Buffer,
- std::move(Obj));
- } else if (Ident.first == ELF::ELFCLASS64 &&
- Ident.second == ELF::ELFDATA2MSB) {
- auto Obj = llvm::make_unique<DyldELFObject<ELFType<support::big, 8, true>>>(
- Buf, ec);
- return new ELFObjectImage<ELFType<support::big, 8, true>>(Buffer, std::move(Obj));
- } else if (Ident.first == ELF::ELFCLASS64 &&
- Ident.second == ELF::ELFDATA2LSB) {
- auto Obj =
- llvm::make_unique<DyldELFObject<ELFType<support::little, 8, true>>>(Buf,
- ec);
- return new ELFObjectImage<ELFType<support::little, 8, true>>(Buffer, std::move(Obj));
- } else
- llvm_unreachable("Unexpected ELF format");
+std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
+RuntimeDyldELF::loadObject(const object::ObjectFile &O) {
+ return llvm::make_unique<LoadedELFObjectInfo>(*this, loadObjectImpl(O));
}
-RuntimeDyldELF::~RuntimeDyldELF() {}
-
void RuntimeDyldELF::resolveX86_64Relocation(const SectionEntry &Section,
uint64_t Offset, uint64_t Value,
uint32_t Type, int64_t Addend,
llvm_unreachable("Relocation type not implemented yet!");
break;
case ELF::R_X86_64_64: {
- uint64_t *Target = reinterpret_cast<uint64_t *>(Section.Address + Offset);
- *Target = Value + Addend;
+ support::ulittle64_t::ref(Section.Address + Offset) = Value + Addend;
DEBUG(dbgs() << "Writing " << format("%p", (Value + Addend)) << " at "
- << format("%p\n", Target));
+ << format("%p\n", Section.Address + Offset));
break;
}
case ELF::R_X86_64_32:
(Type == ELF::R_X86_64_32S &&
((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN)));
uint32_t TruncatedAddr = (Value & 0xFFFFFFFF);
- uint32_t *Target = reinterpret_cast<uint32_t *>(Section.Address + Offset);
- *Target = TruncatedAddr;
+ support::ulittle32_t::ref(Section.Address + Offset) = TruncatedAddr;
DEBUG(dbgs() << "Writing " << format("%p", TruncatedAddr) << " at "
- << format("%p\n", Target));
- break;
- }
- case ELF::R_X86_64_GOTPCREL: {
- // findGOTEntry returns the 'G + GOT' part of the relocation calculation
- // based on the load/target address of the GOT (not the current/local addr).
- uint64_t GOTAddr = findGOTEntry(Value, SymOffset);
- uint32_t *Target = reinterpret_cast<uint32_t *>(Section.Address + Offset);
- uint64_t FinalAddress = Section.LoadAddress + Offset;
- // The processRelocationRef method combines the symbol offset and the addend
- // and in most cases that's what we want. For this relocation type, we need
- // the raw addend, so we subtract the symbol offset to get it.
- int64_t RealOffset = GOTAddr + Addend - SymOffset - FinalAddress;
- assert(RealOffset <= INT32_MAX && RealOffset >= INT32_MIN);
- int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
- *Target = TruncOffset;
+ << format("%p\n", Section.Address + Offset));
break;
}
case ELF::R_X86_64_PC32: {
- // Get the placeholder value from the generated object since
- // a previous relocation attempt may have overwritten the loaded version
- uint32_t *Placeholder =
- reinterpret_cast<uint32_t *>(Section.ObjAddress + Offset);
- uint32_t *Target = reinterpret_cast<uint32_t *>(Section.Address + Offset);
uint64_t FinalAddress = Section.LoadAddress + Offset;
- int64_t RealOffset = *Placeholder + Value + Addend - FinalAddress;
- assert(RealOffset <= INT32_MAX && RealOffset >= INT32_MIN);
+ int64_t RealOffset = Value + Addend - FinalAddress;
+ assert(isInt<32>(RealOffset));
int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
- *Target = TruncOffset;
+ support::ulittle32_t::ref(Section.Address + Offset) = TruncOffset;
break;
}
case ELF::R_X86_64_PC64: {
- // Get the placeholder value from the generated object since
- // a previous relocation attempt may have overwritten the loaded version
- uint64_t *Placeholder =
- reinterpret_cast<uint64_t *>(Section.ObjAddress + Offset);
- uint64_t *Target = reinterpret_cast<uint64_t *>(Section.Address + Offset);
uint64_t FinalAddress = Section.LoadAddress + Offset;
- *Target = *Placeholder + Value + Addend - FinalAddress;
+ int64_t RealOffset = Value + Addend - FinalAddress;
+ support::ulittle64_t::ref(Section.Address + Offset) = RealOffset;
break;
}
}
uint32_t Type, int32_t Addend) {
switch (Type) {
case ELF::R_386_32: {
- // Get the placeholder value from the generated object since
- // a previous relocation attempt may have overwritten the loaded version
- uint32_t *Placeholder =
- reinterpret_cast<uint32_t *>(Section.ObjAddress + Offset);
- uint32_t *Target = reinterpret_cast<uint32_t *>(Section.Address + Offset);
- *Target = *Placeholder + Value + Addend;
+ support::ulittle32_t::ref(Section.Address + Offset) = Value + Addend;
break;
}
case ELF::R_386_PC32: {
- // Get the placeholder value from the generated object since
- // a previous relocation attempt may have overwritten the loaded version
- uint32_t *Placeholder =
- reinterpret_cast<uint32_t *>(Section.ObjAddress + Offset);
- uint32_t *Target = reinterpret_cast<uint32_t *>(Section.Address + Offset);
uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
- uint32_t RealOffset = *Placeholder + Value + Addend - FinalAddress;
- *Target = RealOffset;
+ uint32_t RealOffset = Value + Addend - FinalAddress;
+ support::ulittle32_t::ref(Section.Address + Offset) = RealOffset;
break;
}
default:
uint64_t BranchImm = Value + Addend - FinalAddress;
// "Check that -2^27 <= result < 2^27".
- assert(-(1LL << 27) <= static_cast<int64_t>(BranchImm) &&
- static_cast<int64_t>(BranchImm) < (1LL << 27));
+ assert(isInt<28>(BranchImm));
// AArch64 code is emitted with .rela relocations. The data already in any
// bits affected by the relocation on entry is garbage.
((Value + Addend) & ~0xfffULL) - (FinalAddress & ~0xfffULL);
// Check that -2^32 <= X < 2^32
- assert(static_cast<int64_t>(Result) >= (-1LL << 32) &&
- static_cast<int64_t>(Result) < (1LL << 32) &&
- "overflow check failed for relocation");
+ assert(isInt<33>(Result) && "overflow check failed for relocation");
// AArch64 code is emitted with .rela relocations. The data already in any
// bits affected by the relocation on entry is garbage.
uint64_t Offset, uint32_t Value,
uint32_t Type, int32_t Addend) {
// TODO: Add Thumb relocations.
- uint32_t *Placeholder =
- reinterpret_cast<uint32_t *>(Section.ObjAddress + Offset);
uint32_t *TargetPtr = (uint32_t *)(Section.Address + Offset);
uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
Value += Addend;
case ELF::R_ARM_NONE:
break;
- // Write a 32bit value to relocation address, taking into account the
- // implicit addend encoded in the target.
case ELF::R_ARM_PREL31:
case ELF::R_ARM_TARGET1:
case ELF::R_ARM_ABS32:
- *TargetPtr = *Placeholder + Value;
+ *TargetPtr = Value;
break;
- // Write first 16 bit of 32 bit value to the mov instruction.
- // Last 4 bit should be shifted.
+ // Write first 16 bit of 32 bit value to the mov instruction.
+ // Last 4 bit should be shifted.
case ELF::R_ARM_MOVW_ABS_NC:
- // We are not expecting any other addend in the relocation address.
- // Using 0x000F0FFF because MOVW has its 16 bit immediate split into 2
- // non-contiguous fields.
- assert((*Placeholder & 0x000F0FFF) == 0);
- Value = Value & 0xFFFF;
- *TargetPtr = *Placeholder | (Value & 0xFFF);
- *TargetPtr |= ((Value >> 12) & 0xF) << 16;
- break;
- // Write last 16 bit of 32 bit value to the mov instruction.
- // Last 4 bit should be shifted.
case ELF::R_ARM_MOVT_ABS:
- // We are not expecting any other addend in the relocation address.
- // Use 0x000F0FFF for the same reason as R_ARM_MOVW_ABS_NC.
- assert((*Placeholder & 0x000F0FFF) == 0);
-
- Value = (Value >> 16) & 0xFFFF;
- *TargetPtr = *Placeholder | (Value & 0xFFF);
+ if (Type == ELF::R_ARM_MOVW_ABS_NC)
+ Value = Value & 0xFFFF;
+ else if (Type == ELF::R_ARM_MOVT_ABS)
+ Value = (Value >> 16) & 0xFFFF;
+ *TargetPtr &= ~0x000F0FFF;
+ *TargetPtr |= Value & 0xFFF;
*TargetPtr |= ((Value >> 12) & 0xF) << 16;
break;
- // Write 24 bit relative value to the branch instruction.
+ // Write 24 bit relative value to the branch instruction.
case ELF::R_ARM_PC24: // Fall through.
case ELF::R_ARM_CALL: // Fall through.
- case ELF::R_ARM_JUMP24: {
+ case ELF::R_ARM_JUMP24:
int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8);
RelValue = (RelValue & 0x03FFFFFC) >> 2;
assert((*TargetPtr & 0xFFFFFF) == 0xFFFFFE);
*TargetPtr |= RelValue;
break;
}
- case ELF::R_ARM_PRIVATE_0:
- // This relocation is reserved by the ARM ELF ABI for internal use. We
- // appropriate it here to act as an R_ARM_ABS32 without any addend for use
- // in the stubs created during JIT (which can't put an addend into the
- // original object file).
- *TargetPtr = Value;
- break;
- }
}
void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section,
uint64_t Offset, uint32_t Value,
uint32_t Type, int32_t Addend) {
- uint32_t *Placeholder =
- reinterpret_cast<uint32_t *>(Section.ObjAddress + Offset);
- uint32_t *TargetPtr = (uint32_t *)(Section.Address + Offset);
+ uint8_t *TargetPtr = Section.Address + Offset;
Value += Addend;
- DEBUG(dbgs() << "resolveMipselocation, LocalAddress: "
+ DEBUG(dbgs() << "resolveMIPSRelocation, LocalAddress: "
<< Section.Address + Offset << " FinalAddress: "
<< format("%p", Section.LoadAddress + Offset) << " Value: "
<< format("%x", Value) << " Type: " << format("%x", Type)
<< " Addend: " << format("%x", Addend) << "\n");
+ uint32_t Insn = readBytesUnaligned(TargetPtr, 4);
+
switch (Type) {
default:
llvm_unreachable("Not implemented relocation type!");
break;
case ELF::R_MIPS_32:
- *TargetPtr = Value + (*Placeholder);
+ writeBytesUnaligned(Value, TargetPtr, 4);
break;
case ELF::R_MIPS_26:
- *TargetPtr = ((*Placeholder) & 0xfc000000) | ((Value & 0x0fffffff) >> 2);
+ Insn &= 0xfc000000;
+ Insn |= (Value & 0x0fffffff) >> 2;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
break;
case ELF::R_MIPS_HI16:
// Get the higher 16-bits. Also add 1 if bit 15 is 1.
- Value += ((*Placeholder) & 0x0000ffff) << 16;
- *TargetPtr =
- ((*Placeholder) & 0xffff0000) | (((Value + 0x8000) >> 16) & 0xffff);
+ Insn &= 0xffff0000;
+ Insn |= ((Value + 0x8000) >> 16) & 0xffff;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
break;
case ELF::R_MIPS_LO16:
- Value += ((*Placeholder) & 0x0000ffff);
- *TargetPtr = ((*Placeholder) & 0xffff0000) | (Value & 0xffff);
+ Insn &= 0xffff0000;
+ Insn |= Value & 0xffff;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ case ELF::R_MIPS_PC32: {
+ uint32_t FinalAddress = (Section.LoadAddress + Offset);
+ writeBytesUnaligned(Value - FinalAddress, (uint8_t *)TargetPtr, 4);
+ break;
+ }
+ case ELF::R_MIPS_PC16: {
+ uint32_t FinalAddress = (Section.LoadAddress + Offset);
+ Insn &= 0xffff0000;
+ Insn |= ((Value - FinalAddress) >> 2) & 0xffff;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ }
+ case ELF::R_MIPS_PC19_S2: {
+ uint32_t FinalAddress = (Section.LoadAddress + Offset);
+ Insn &= 0xfff80000;
+ Insn |= ((Value - (FinalAddress & ~0x3)) >> 2) & 0x7ffff;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ }
+ case ELF::R_MIPS_PC21_S2: {
+ uint32_t FinalAddress = (Section.LoadAddress + Offset);
+ Insn &= 0xffe00000;
+ Insn |= ((Value - FinalAddress) >> 2) & 0x1fffff;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ }
+ case ELF::R_MIPS_PC26_S2: {
+ uint32_t FinalAddress = (Section.LoadAddress + Offset);
+ Insn &= 0xfc000000;
+ Insn |= ((Value - FinalAddress) >> 2) & 0x3ffffff;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
break;
- case ELF::R_MIPS_UNUSED1:
- // Similar to ELF::R_ARM_PRIVATE_0, R_MIPS_UNUSED1 and R_MIPS_UNUSED2
- // are used for internal JIT purpose. These relocations are similar to
- // R_MIPS_HI16 and R_MIPS_LO16, but they do not take any addend into
- // account.
- *TargetPtr =
- ((*TargetPtr) & 0xffff0000) | (((Value + 0x8000) >> 16) & 0xffff);
+ }
+ case ELF::R_MIPS_PCHI16: {
+ uint32_t FinalAddress = (Section.LoadAddress + Offset);
+ Insn &= 0xffff0000;
+ Insn |= ((Value - FinalAddress + 0x8000) >> 16) & 0xffff;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
break;
- case ELF::R_MIPS_UNUSED2:
- *TargetPtr = ((*TargetPtr) & 0xffff0000) | (Value & 0xffff);
+ }
+ case ELF::R_MIPS_PCLO16: {
+ uint32_t FinalAddress = (Section.LoadAddress + Offset);
+ Insn &= 0xffff0000;
+ Insn |= (Value - FinalAddress) & 0xffff;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
break;
}
+ }
+}
+
+void RuntimeDyldELF::setMipsABI(const ObjectFile &Obj) {
+ if (Arch == Triple::UnknownArch ||
+ !StringRef(Triple::getArchTypePrefix(Arch)).equals("mips")) {
+ IsMipsO32ABI = false;
+ IsMipsN64ABI = false;
+ return;
+ }
+ unsigned AbiVariant;
+ Obj.getPlatformFlags(AbiVariant);
+ IsMipsO32ABI = AbiVariant & ELF::EF_MIPS_ABI_O32;
+ IsMipsN64ABI = Obj.getFileFormatName().equals("ELF64-mips");
+ if (AbiVariant & ELF::EF_MIPS_ABI2)
+ llvm_unreachable("Mips N32 ABI is not supported yet");
+}
+
+void RuntimeDyldELF::resolveMIPS64Relocation(const SectionEntry &Section,
+ uint64_t Offset, uint64_t Value,
+ uint32_t Type, int64_t Addend,
+ uint64_t SymOffset,
+ SID SectionID) {
+ uint32_t r_type = Type & 0xff;
+ uint32_t r_type2 = (Type >> 8) & 0xff;
+ uint32_t r_type3 = (Type >> 16) & 0xff;
+
+ // RelType is used to keep information for which relocation type we are
+ // applying relocation.
+ uint32_t RelType = r_type;
+ int64_t CalculatedValue = evaluateMIPS64Relocation(Section, Offset, Value,
+ RelType, Addend,
+ SymOffset, SectionID);
+ if (r_type2 != ELF::R_MIPS_NONE) {
+ RelType = r_type2;
+ CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType,
+ CalculatedValue, SymOffset,
+ SectionID);
+ }
+ if (r_type3 != ELF::R_MIPS_NONE) {
+ RelType = r_type3;
+ CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType,
+ CalculatedValue, SymOffset,
+ SectionID);
+ }
+ applyMIPS64Relocation(Section.Address + Offset, CalculatedValue, RelType);
+}
+
+int64_t
+RuntimeDyldELF::evaluateMIPS64Relocation(const SectionEntry &Section,
+ uint64_t Offset, uint64_t Value,
+ uint32_t Type, int64_t Addend,
+ uint64_t SymOffset, SID SectionID) {
+
+ DEBUG(dbgs() << "evaluateMIPS64Relocation, LocalAddress: 0x"
+ << format("%llx", Section.Address + Offset)
+ << " FinalAddress: 0x"
+ << format("%llx", Section.LoadAddress + Offset)
+ << " Value: 0x" << format("%llx", Value) << " Type: 0x"
+ << format("%x", Type) << " Addend: 0x" << format("%llx", Addend)
+ << " SymOffset: " << format("%x", SymOffset)
+ << "\n");
+
+ switch (Type) {
+ default:
+ llvm_unreachable("Not implemented relocation type!");
+ break;
+ case ELF::R_MIPS_JALR:
+ case ELF::R_MIPS_NONE:
+ break;
+ case ELF::R_MIPS_32:
+ case ELF::R_MIPS_64:
+ return Value + Addend;
+ case ELF::R_MIPS_26:
+ return ((Value + Addend) >> 2) & 0x3ffffff;
+ case ELF::R_MIPS_GPREL16: {
+ uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]);
+ return Value + Addend - (GOTAddr + 0x7ff0);
+ }
+ case ELF::R_MIPS_SUB:
+ return Value - Addend;
+ case ELF::R_MIPS_HI16:
+ // Get the higher 16-bits. Also add 1 if bit 15 is 1.
+ return ((Value + Addend + 0x8000) >> 16) & 0xffff;
+ case ELF::R_MIPS_LO16:
+ return (Value + Addend) & 0xffff;
+ case ELF::R_MIPS_CALL16:
+ case ELF::R_MIPS_GOT_DISP:
+ case ELF::R_MIPS_GOT_PAGE: {
+ uint8_t *LocalGOTAddr =
+ getSectionAddress(SectionToGOTMap[SectionID]) + SymOffset;
+ uint64_t GOTEntry = readBytesUnaligned(LocalGOTAddr, 8);
+
+ Value += Addend;
+ if (Type == ELF::R_MIPS_GOT_PAGE)
+ Value = (Value + 0x8000) & ~0xffff;
+
+ if (GOTEntry)
+ assert(GOTEntry == Value &&
+ "GOT entry has two different addresses.");
+ else
+ writeBytesUnaligned(Value, LocalGOTAddr, 8);
+
+ return (SymOffset - 0x7ff0) & 0xffff;
+ }
+ case ELF::R_MIPS_GOT_OFST: {
+ int64_t page = (Value + Addend + 0x8000) & ~0xffff;
+ return (Value + Addend - page) & 0xffff;
+ }
+ case ELF::R_MIPS_GPREL32: {
+ uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]);
+ return Value + Addend - (GOTAddr + 0x7ff0);
+ }
+ case ELF::R_MIPS_PC16: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ return ((Value + Addend - FinalAddress) >> 2) & 0xffff;
+ }
+ case ELF::R_MIPS_PC32: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ return Value + Addend - FinalAddress;
+ }
+ case ELF::R_MIPS_PC18_S3: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ return ((Value + Addend - (FinalAddress & ~0x7)) >> 3) & 0x3ffff;
+ }
+ case ELF::R_MIPS_PC19_S2: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ return ((Value + Addend - (FinalAddress & ~0x3)) >> 2) & 0x7ffff;
+ }
+ case ELF::R_MIPS_PC21_S2: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ return ((Value + Addend - FinalAddress) >> 2) & 0x1fffff;
+ }
+ case ELF::R_MIPS_PC26_S2: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ return ((Value + Addend - FinalAddress) >> 2) & 0x3ffffff;
+ }
+ case ELF::R_MIPS_PCHI16: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ return ((Value + Addend - FinalAddress + 0x8000) >> 16) & 0xffff;
+ }
+ case ELF::R_MIPS_PCLO16: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ return (Value + Addend - FinalAddress) & 0xffff;
+ }
+ }
+ return 0;
+}
+
+void RuntimeDyldELF::applyMIPS64Relocation(uint8_t *TargetPtr,
+ int64_t CalculatedValue,
+ uint32_t Type) {
+ uint32_t Insn = readBytesUnaligned(TargetPtr, 4);
+
+ switch (Type) {
+ default:
+ break;
+ case ELF::R_MIPS_32:
+ case ELF::R_MIPS_GPREL32:
+ case ELF::R_MIPS_PC32:
+ writeBytesUnaligned(CalculatedValue & 0xffffffff, TargetPtr, 4);
+ break;
+ case ELF::R_MIPS_64:
+ case ELF::R_MIPS_SUB:
+ writeBytesUnaligned(CalculatedValue, TargetPtr, 8);
+ break;
+ case ELF::R_MIPS_26:
+ case ELF::R_MIPS_PC26_S2:
+ Insn = (Insn & 0xfc000000) | CalculatedValue;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ case ELF::R_MIPS_GPREL16:
+ Insn = (Insn & 0xffff0000) | (CalculatedValue & 0xffff);
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ case ELF::R_MIPS_HI16:
+ case ELF::R_MIPS_LO16:
+ case ELF::R_MIPS_PCHI16:
+ case ELF::R_MIPS_PCLO16:
+ case ELF::R_MIPS_PC16:
+ case ELF::R_MIPS_CALL16:
+ case ELF::R_MIPS_GOT_DISP:
+ case ELF::R_MIPS_GOT_PAGE:
+ case ELF::R_MIPS_GOT_OFST:
+ Insn = (Insn & 0xffff0000) | CalculatedValue;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ case ELF::R_MIPS_PC18_S3:
+ Insn = (Insn & 0xfffc0000) | CalculatedValue;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ case ELF::R_MIPS_PC19_S2:
+ Insn = (Insn & 0xfff80000) | CalculatedValue;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ case ELF::R_MIPS_PC21_S2:
+ Insn = (Insn & 0xffe00000) | CalculatedValue;
+ writeBytesUnaligned(Insn, TargetPtr, 4);
+ break;
+ }
}
// Return the .TOC. section and offset.
-void RuntimeDyldELF::findPPC64TOCSection(ObjectImage &Obj,
+void RuntimeDyldELF::findPPC64TOCSection(const ELFObjectFileBase &Obj,
ObjSectionToIDMap &LocalSections,
RelocationValueRef &Rel) {
// Set a default SectionID in case we do not find a TOC section below.
// relocation) without a .toc directive. In this case just use the
// first section (which is usually the .odp) since the code won't
// reference the .toc base directly.
- Rel.SymbolName = NULL;
+ Rel.SymbolName = nullptr;
Rel.SectionID = 0;
// The TOC consists of sections .got, .toc, .tocbss, .plt in that
// order. The TOC starts where the first of these sections starts.
- for (section_iterator si = Obj.begin_sections(), se = Obj.end_sections();
- si != se; ++si) {
-
+ for (auto &Section: Obj.sections()) {
StringRef SectionName;
- check(si->getName(SectionName));
+ check(Section.getName(SectionName));
if (SectionName == ".got"
|| SectionName == ".toc"
|| SectionName == ".tocbss"
|| SectionName == ".plt") {
- Rel.SectionID = findOrEmitSection(Obj, *si, false, LocalSections);
+ Rel.SectionID = findOrEmitSection(Obj, Section, false, LocalSections);
break;
}
}
// Returns the sections and offset associated with the ODP entry referenced
// by Symbol.
-void RuntimeDyldELF::findOPDEntrySection(ObjectImage &Obj,
+void RuntimeDyldELF::findOPDEntrySection(const ELFObjectFileBase &Obj,
ObjSectionToIDMap &LocalSections,
RelocationValueRef &Rel) {
// Get the ELF symbol value (st_value) to compare with Relocation offset in
// .opd entries
- for (section_iterator si = Obj.begin_sections(), se = Obj.end_sections();
+ for (section_iterator si = Obj.section_begin(), se = Obj.section_end();
si != se; ++si) {
section_iterator RelSecI = si->getRelocatedSection();
- if (RelSecI == Obj.end_sections())
+ if (RelSecI == Obj.section_end())
continue;
StringRef RelSectionName;
if (RelSectionName != ".opd")
continue;
- for (relocation_iterator i = si->relocation_begin(),
- e = si->relocation_end();
+ for (elf_relocation_iterator i = si->relocation_begin(),
+ e = si->relocation_end();
i != e;) {
// The R_PPC64_ADDR64 relocation indicates the first field
// of a .opd entry
- uint64_t TypeFunc;
- check(i->getType(TypeFunc));
+ uint64_t TypeFunc = i->getType();
if (TypeFunc != ELF::R_PPC64_ADDR64) {
++i;
continue;
}
- uint64_t TargetSymbolOffset;
+ uint64_t TargetSymbolOffset = i->getOffset();
symbol_iterator TargetSymbol = i->getSymbol();
- check(i->getOffset(TargetSymbolOffset));
- int64_t Addend;
- check(getELFRelocationAddend(*i, Addend));
+ ErrorOr<int64_t> AddendOrErr = i->getAddend();
+ Check(AddendOrErr.getError());
+ int64_t Addend = *AddendOrErr;
++i;
if (i == e)
break;
// Just check if following relocation is a R_PPC64_TOC
- uint64_t TypeTOC;
- check(i->getType(TypeTOC));
+ uint64_t TypeTOC = i->getType();
if (TypeTOC != ELF::R_PPC64_TOC)
continue;
if (Rel.Addend != (int64_t)TargetSymbolOffset)
continue;
- section_iterator tsi(Obj.end_sections());
- check(TargetSymbol->getSection(tsi));
- bool IsCode = false;
- tsi->isText(IsCode);
+ ErrorOr<section_iterator> TSIOrErr = TargetSymbol->getSection();
+ check(TSIOrErr.getError());
+ section_iterator tsi = *TSIOrErr;
+ bool IsCode = tsi->isText();
Rel.SectionID = findOrEmitSection(Obj, (*tsi), IsCode, LocalSections);
Rel.Addend = (intptr_t)Addend;
return;
return ((value + 0x8000) >> 48) & 0xffff;
}
+void RuntimeDyldELF::resolvePPC32Relocation(const SectionEntry &Section,
+ uint64_t Offset, uint64_t Value,
+ uint32_t Type, int64_t Addend) {
+ uint8_t *LocalAddress = Section.Address + Offset;
+ switch (Type) {
+ default:
+ llvm_unreachable("Relocation type not implemented yet!");
+ break;
+ case ELF::R_PPC_ADDR16_LO:
+ writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
+ break;
+ case ELF::R_PPC_ADDR16_HI:
+ writeInt16BE(LocalAddress, applyPPChi(Value + Addend));
+ break;
+ case ELF::R_PPC_ADDR16_HA:
+ writeInt16BE(LocalAddress, applyPPCha(Value + Addend));
+ break;
+ }
+}
+
void RuntimeDyldELF::resolvePPC64Relocation(const SectionEntry &Section,
uint64_t Offset, uint64_t Value,
uint32_t Type, int64_t Addend) {
uint64_t Value) {
const SectionEntry &Section = Sections[RE.SectionID];
return resolveRelocation(Section, RE.Offset, Value, RE.RelType, RE.Addend,
- RE.SymOffset);
+ RE.SymOffset, RE.SectionID);
}
void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section,
uint64_t Offset, uint64_t Value,
uint32_t Type, int64_t Addend,
- uint64_t SymOffset) {
+ uint64_t SymOffset, SID SectionID) {
switch (Arch) {
case Triple::x86_64:
resolveX86_64Relocation(Section, Offset, Value, Type, Addend, SymOffset);
break;
case Triple::mips: // Fall through.
case Triple::mipsel:
- resolveMIPSRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL),
- Type, (uint32_t)(Addend & 0xffffffffL));
+ case Triple::mips64:
+ case Triple::mips64el:
+ if (IsMipsO32ABI)
+ resolveMIPSRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL),
+ Type, (uint32_t)(Addend & 0xffffffffL));
+ else if (IsMipsN64ABI)
+ resolveMIPS64Relocation(Section, Offset, Value, Type, Addend, SymOffset,
+ SectionID);
+ else
+ llvm_unreachable("Mips ABI not handled");
+ break;
+ case Triple::ppc:
+ resolvePPC32Relocation(Section, Offset, Value, Type, Addend);
break;
case Triple::ppc64: // Fall through.
case Triple::ppc64le:
}
}
+void *RuntimeDyldELF::computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const {
+ return (void*)(Sections[SectionID].ObjAddress + Offset);
+}
+
+void RuntimeDyldELF::processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value) {
+ RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, Value.Offset);
+ if (Value.SymbolName)
+ addRelocationForSymbol(RE, Value.SymbolName);
+ else
+ addRelocationForSection(RE, Value.SectionID);
+}
+
+uint32_t RuntimeDyldELF::getMatchingLoRelocation(uint32_t RelType,
+ bool IsLocal) const {
+ switch (RelType) {
+ case ELF::R_MICROMIPS_GOT16:
+ if (IsLocal)
+ return ELF::R_MICROMIPS_LO16;
+ break;
+ case ELF::R_MICROMIPS_HI16:
+ return ELF::R_MICROMIPS_LO16;
+ case ELF::R_MIPS_GOT16:
+ if (IsLocal)
+ return ELF::R_MIPS_LO16;
+ break;
+ case ELF::R_MIPS_HI16:
+ return ELF::R_MIPS_LO16;
+ case ELF::R_MIPS_PCHI16:
+ return ELF::R_MIPS_PCLO16;
+ default:
+ break;
+ }
+ return ELF::R_MIPS_NONE;
+}
+
relocation_iterator RuntimeDyldELF::processRelocationRef(
- unsigned SectionID, relocation_iterator RelI, ObjectImage &Obj,
- ObjSectionToIDMap &ObjSectionToID, const SymbolTableMap &Symbols,
- StubMap &Stubs) {
- uint64_t RelType;
- Check(RelI->getType(RelType));
- int64_t Addend;
- Check(getELFRelocationAddend(*RelI, Addend));
- symbol_iterator Symbol = RelI->getSymbol();
+ unsigned SectionID, relocation_iterator RelI, const ObjectFile &O,
+ ObjSectionToIDMap &ObjSectionToID, StubMap &Stubs) {
+ const auto &Obj = cast<ELFObjectFileBase>(O);
+ uint64_t RelType = RelI->getType();
+ ErrorOr<int64_t> AddendOrErr = ELFRelocationRef(*RelI).getAddend();
+ int64_t Addend = AddendOrErr ? *AddendOrErr : 0;
+ elf_symbol_iterator Symbol = RelI->getSymbol();
// Obtain the symbol name which is referenced in the relocation
StringRef TargetName;
- if (Symbol != Obj.end_symbols())
- Symbol->getName(TargetName);
+ if (Symbol != Obj.symbol_end()) {
+ ErrorOr<StringRef> TargetNameOrErr = Symbol->getName();
+ if (std::error_code EC = TargetNameOrErr.getError())
+ report_fatal_error(EC.message());
+ TargetName = *TargetNameOrErr;
+ }
DEBUG(dbgs() << "\t\tRelType: " << RelType << " Addend: " << Addend
<< " TargetName: " << TargetName << "\n");
RelocationValueRef Value;
// First search for the symbol in the local symbol table
- SymbolTableMap::const_iterator lsi = Symbols.end();
SymbolRef::Type SymType = SymbolRef::ST_Unknown;
- if (Symbol != Obj.end_symbols()) {
- lsi = Symbols.find(TargetName.data());
- Symbol->getType(SymType);
- }
- if (lsi != Symbols.end()) {
- Value.SectionID = lsi->second.first;
- Value.Offset = lsi->second.second;
- Value.Addend = lsi->second.second + Addend;
+
+ // Search for the symbol in the global symbol table
+ RTDyldSymbolTable::const_iterator gsi = GlobalSymbolTable.end();
+ if (Symbol != Obj.symbol_end()) {
+ gsi = GlobalSymbolTable.find(TargetName.data());
+ SymType = Symbol->getType();
+ }
+ if (gsi != GlobalSymbolTable.end()) {
+ const auto &SymInfo = gsi->second;
+ Value.SectionID = SymInfo.getSectionID();
+ Value.Offset = SymInfo.getOffset();
+ Value.Addend = SymInfo.getOffset() + Addend;
} else {
- // Search for the symbol in the global symbol table
- SymbolTableMap::const_iterator gsi = GlobalSymbolTable.end();
- if (Symbol != Obj.end_symbols())
- gsi = GlobalSymbolTable.find(TargetName.data());
- if (gsi != GlobalSymbolTable.end()) {
- Value.SectionID = gsi->second.first;
- Value.Offset = gsi->second.second;
- Value.Addend = gsi->second.second + Addend;
- } else {
- switch (SymType) {
- case SymbolRef::ST_Debug: {
- // TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously
- // and can be changed by another developers. Maybe best way is add
- // a new symbol type ST_Section to SymbolRef and use it.
- section_iterator si(Obj.end_sections());
- Symbol->getSection(si);
- if (si == Obj.end_sections())
- llvm_unreachable("Symbol section not found, bad object file format!");
- DEBUG(dbgs() << "\t\tThis is section symbol\n");
- // Default to 'true' in case isText fails (though it never does).
- bool isCode = true;
- si->isText(isCode);
- Value.SectionID = findOrEmitSection(Obj, (*si), isCode, ObjSectionToID);
- Value.Addend = Addend;
- break;
- }
- case SymbolRef::ST_Data:
- case SymbolRef::ST_Unknown: {
- Value.SymbolName = TargetName.data();
- Value.Addend = Addend;
-
- // Absolute relocations will have a zero symbol ID (STN_UNDEF), which
- // will manifest here as a NULL symbol name.
- // We can set this as a valid (but empty) symbol name, and rely
- // on addRelocationForSymbol to handle this.
- if (!Value.SymbolName)
- Value.SymbolName = "";
- break;
- }
- default:
- llvm_unreachable("Unresolved symbol type!");
- break;
- }
+ switch (SymType) {
+ case SymbolRef::ST_Debug: {
+ // TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously
+ // and can be changed by another developers. Maybe best way is add
+ // a new symbol type ST_Section to SymbolRef and use it.
+ section_iterator si = *Symbol->getSection();
+ if (si == Obj.section_end())
+ llvm_unreachable("Symbol section not found, bad object file format!");
+ DEBUG(dbgs() << "\t\tThis is section symbol\n");
+ bool isCode = si->isText();
+ Value.SectionID = findOrEmitSection(Obj, (*si), isCode, ObjSectionToID);
+ Value.Addend = Addend;
+ break;
+ }
+ case SymbolRef::ST_Data:
+ case SymbolRef::ST_Unknown: {
+ Value.SymbolName = TargetName.data();
+ Value.Addend = Addend;
+
+ // Absolute relocations will have a zero symbol ID (STN_UNDEF), which
+ // will manifest here as a NULL symbol name.
+ // We can set this as a valid (but empty) symbol name, and rely
+ // on addRelocationForSymbol to handle this.
+ if (!Value.SymbolName)
+ Value.SymbolName = "";
+ break;
+ }
+ default:
+ llvm_unreachable("Unresolved symbol type!");
+ break;
}
}
- uint64_t Offset;
- Check(RelI->getOffset(Offset));
+
+ uint64_t Offset = RelI->getOffset();
DEBUG(dbgs() << "\t\tSectionID: " << SectionID << " Offset: " << Offset
<< "\n");
0);
Section.StubOffset += getMaxStubSize();
}
- } else if (Arch == Triple::arm &&
- (RelType == ELF::R_ARM_PC24 || RelType == ELF::R_ARM_CALL ||
- RelType == ELF::R_ARM_JUMP24)) {
- // This is an ARM branch relocation, need to use a stub function.
- DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.");
- SectionEntry &Section = Sections[SectionID];
+ } else if (Arch == Triple::arm) {
+ if (RelType == ELF::R_ARM_PC24 || RelType == ELF::R_ARM_CALL ||
+ RelType == ELF::R_ARM_JUMP24) {
+ // This is an ARM branch relocation, need to use a stub function.
+ DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.");
+ SectionEntry &Section = Sections[SectionID];
- // Look for an existing stub.
- StubMap::const_iterator i = Stubs.find(Value);
- if (i != Stubs.end()) {
- resolveRelocation(Section, Offset, (uint64_t)Section.Address + i->second,
- RelType, 0);
- DEBUG(dbgs() << " Stub function found\n");
- } else {
- // Create a new stub function.
- DEBUG(dbgs() << " Create a new stub function\n");
- Stubs[Value] = Section.StubOffset;
- uint8_t *StubTargetAddr =
+ // Look for an existing stub.
+ StubMap::const_iterator i = Stubs.find(Value);
+ if (i != Stubs.end()) {
+ resolveRelocation(Section, Offset, (uint64_t)Section.Address + i->second,
+ RelType, 0);
+ DEBUG(dbgs() << " Stub function found\n");
+ } else {
+ // Create a new stub function.
+ DEBUG(dbgs() << " Create a new stub function\n");
+ Stubs[Value] = Section.StubOffset;
+ uint8_t *StubTargetAddr =
createStubFunction(Section.Address + Section.StubOffset);
- RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
- ELF::R_ARM_PRIVATE_0, Value.Addend);
- if (Value.SymbolName)
- addRelocationForSymbol(RE, Value.SymbolName);
- else
- addRelocationForSection(RE, Value.SectionID);
-
- resolveRelocation(Section, Offset,
- (uint64_t)Section.Address + Section.StubOffset, RelType,
- 0);
- Section.StubOffset += getMaxStubSize();
+ RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
+ ELF::R_ARM_ABS32, Value.Addend);
+ if (Value.SymbolName)
+ addRelocationForSymbol(RE, Value.SymbolName);
+ else
+ addRelocationForSection(RE, Value.SectionID);
+
+ resolveRelocation(Section, Offset,
+ (uint64_t)Section.Address + Section.StubOffset, RelType,
+ 0);
+ Section.StubOffset += getMaxStubSize();
+ }
+ } else {
+ uint32_t *Placeholder =
+ reinterpret_cast<uint32_t*>(computePlaceholderAddress(SectionID, Offset));
+ if (RelType == ELF::R_ARM_PREL31 || RelType == ELF::R_ARM_TARGET1 ||
+ RelType == ELF::R_ARM_ABS32) {
+ Value.Addend += *Placeholder;
+ } else if (RelType == ELF::R_ARM_MOVW_ABS_NC || RelType == ELF::R_ARM_MOVT_ABS) {
+ // See ELF for ARM documentation
+ Value.Addend += (int16_t)((*Placeholder & 0xFFF) | (((*Placeholder >> 16) & 0xF) << 12));
+ }
+ processSimpleRelocation(SectionID, Offset, RelType, Value);
}
- } else if ((Arch == Triple::mipsel || Arch == Triple::mips) &&
- RelType == ELF::R_MIPS_26) {
- // This is an Mips branch relocation, need to use a stub function.
- DEBUG(dbgs() << "\t\tThis is a Mips branch relocation.");
- SectionEntry &Section = Sections[SectionID];
- uint8_t *Target = Section.Address + Offset;
- uint32_t *TargetAddress = (uint32_t *)Target;
+ } else if (IsMipsO32ABI) {
+ uint8_t *Placeholder = reinterpret_cast<uint8_t *>(
+ computePlaceholderAddress(SectionID, Offset));
+ uint32_t Opcode = readBytesUnaligned(Placeholder, 4);
+ if (RelType == ELF::R_MIPS_26) {
+ // This is an Mips branch relocation, need to use a stub function.
+ DEBUG(dbgs() << "\t\tThis is a Mips branch relocation.");
+ SectionEntry &Section = Sections[SectionID];
- // Extract the addend from the instruction.
- uint32_t Addend = ((*TargetAddress) & 0x03ffffff) << 2;
+ // Extract the addend from the instruction.
+ // We shift up by two since the Value will be down shifted again
+ // when applying the relocation.
+ uint32_t Addend = (Opcode & 0x03ffffff) << 2;
- Value.Addend += Addend;
+ Value.Addend += Addend;
- // Look up for existing stub.
- StubMap::const_iterator i = Stubs.find(Value);
- if (i != Stubs.end()) {
- RelocationEntry RE(SectionID, Offset, RelType, i->second);
- addRelocationForSection(RE, SectionID);
- DEBUG(dbgs() << " Stub function found\n");
- } else {
- // Create a new stub function.
- DEBUG(dbgs() << " Create a new stub function\n");
- Stubs[Value] = Section.StubOffset;
- uint8_t *StubTargetAddr =
+ // Look up for existing stub.
+ StubMap::const_iterator i = Stubs.find(Value);
+ if (i != Stubs.end()) {
+ RelocationEntry RE(SectionID, Offset, RelType, i->second);
+ addRelocationForSection(RE, SectionID);
+ DEBUG(dbgs() << " Stub function found\n");
+ } else {
+ // Create a new stub function.
+ DEBUG(dbgs() << " Create a new stub function\n");
+ Stubs[Value] = Section.StubOffset;
+ uint8_t *StubTargetAddr =
createStubFunction(Section.Address + Section.StubOffset);
- // Creating Hi and Lo relocations for the filled stub instructions.
- RelocationEntry REHi(SectionID, StubTargetAddr - Section.Address,
- ELF::R_MIPS_UNUSED1, Value.Addend);
- RelocationEntry RELo(SectionID, StubTargetAddr - Section.Address + 4,
- ELF::R_MIPS_UNUSED2, Value.Addend);
+ // Creating Hi and Lo relocations for the filled stub instructions.
+ RelocationEntry REHi(SectionID, StubTargetAddr - Section.Address,
+ ELF::R_MIPS_HI16, Value.Addend);
+ RelocationEntry RELo(SectionID, StubTargetAddr - Section.Address + 4,
+ ELF::R_MIPS_LO16, Value.Addend);
- if (Value.SymbolName) {
- addRelocationForSymbol(REHi, Value.SymbolName);
- addRelocationForSymbol(RELo, Value.SymbolName);
- } else {
- addRelocationForSection(REHi, Value.SectionID);
- addRelocationForSection(RELo, Value.SectionID);
- }
+ if (Value.SymbolName) {
+ addRelocationForSymbol(REHi, Value.SymbolName);
+ addRelocationForSymbol(RELo, Value.SymbolName);
+ }
+ else {
+ addRelocationForSection(REHi, Value.SectionID);
+ addRelocationForSection(RELo, Value.SectionID);
+ }
- RelocationEntry RE(SectionID, Offset, RelType, Section.StubOffset);
- addRelocationForSection(RE, SectionID);
- Section.StubOffset += getMaxStubSize();
+ RelocationEntry RE(SectionID, Offset, RelType, Section.StubOffset);
+ addRelocationForSection(RE, SectionID);
+ Section.StubOffset += getMaxStubSize();
+ }
+ } else if (RelType == ELF::R_MIPS_HI16 || RelType == ELF::R_MIPS_PCHI16) {
+ int64_t Addend = (Opcode & 0x0000ffff) << 16;
+ RelocationEntry RE(SectionID, Offset, RelType, Addend);
+ PendingRelocs.push_back(std::make_pair(Value, RE));
+ } else if (RelType == ELF::R_MIPS_LO16 || RelType == ELF::R_MIPS_PCLO16) {
+ int64_t Addend = Value.Addend + SignExtend32<16>(Opcode & 0x0000ffff);
+ for (auto I = PendingRelocs.begin(); I != PendingRelocs.end();) {
+ const RelocationValueRef &MatchingValue = I->first;
+ RelocationEntry &Reloc = I->second;
+ if (MatchingValue == Value &&
+ RelType == getMatchingLoRelocation(Reloc.RelType) &&
+ SectionID == Reloc.SectionID) {
+ Reloc.Addend += Addend;
+ if (Value.SymbolName)
+ addRelocationForSymbol(Reloc, Value.SymbolName);
+ else
+ addRelocationForSection(Reloc, Value.SectionID);
+ I = PendingRelocs.erase(I);
+ } else
+ ++I;
+ }
+ RelocationEntry RE(SectionID, Offset, RelType, Addend);
+ if (Value.SymbolName)
+ addRelocationForSymbol(RE, Value.SymbolName);
+ else
+ addRelocationForSection(RE, Value.SectionID);
+ } else {
+ if (RelType == ELF::R_MIPS_32)
+ Value.Addend += Opcode;
+ else if (RelType == ELF::R_MIPS_PC16)
+ Value.Addend += SignExtend32<18>((Opcode & 0x0000ffff) << 2);
+ else if (RelType == ELF::R_MIPS_PC19_S2)
+ Value.Addend += SignExtend32<21>((Opcode & 0x0007ffff) << 2);
+ else if (RelType == ELF::R_MIPS_PC21_S2)
+ Value.Addend += SignExtend32<23>((Opcode & 0x001fffff) << 2);
+ else if (RelType == ELF::R_MIPS_PC26_S2)
+ Value.Addend += SignExtend32<28>((Opcode & 0x03ffffff) << 2);
+ processSimpleRelocation(SectionID, Offset, RelType, Value);
+ }
+ } else if (IsMipsN64ABI) {
+ uint32_t r_type = RelType & 0xff;
+ RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
+ if (r_type == ELF::R_MIPS_CALL16 || r_type == ELF::R_MIPS_GOT_PAGE
+ || r_type == ELF::R_MIPS_GOT_DISP) {
+ StringMap<uint64_t>::iterator i = GOTSymbolOffsets.find(TargetName);
+ if (i != GOTSymbolOffsets.end())
+ RE.SymOffset = i->second;
+ else {
+ RE.SymOffset = allocateGOTEntries(SectionID, 1);
+ GOTSymbolOffsets[TargetName] = RE.SymOffset;
+ }
}
+ if (Value.SymbolName)
+ addRelocationForSymbol(RE, Value.SymbolName);
+ else
+ addRelocationForSection(RE, Value.SectionID);
} else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
if (RelType == ELF::R_PPC64_REL24) {
// Determine ABI variant in use for this object.
unsigned AbiVariant;
- Obj.getObjectFile()->getPlatformFlags(AbiVariant);
+ Obj.getPlatformFlags(AbiVariant);
AbiVariant &= ELF::EF_PPC64_ABI;
// A PPC branch relocation will need a stub function if the target is
// an external symbol (Symbol::ST_Unknown) or if the target address
} else {
// In the ELFv2 ABI, a function symbol may provide a local entry
// point, which must be used for direct calls.
- uint8_t SymOther;
- Symbol->getOther(SymOther);
+ uint8_t SymOther = Symbol->getOther();
Value.Addend += ELF::decodePPC64LocalEntryOffset(SymOther);
}
uint8_t *RelocTarget = Sections[Value.SectionID].Address + Value.Addend;
RangeOverflow = true;
}
}
- if (SymType == SymbolRef::ST_Unknown || RangeOverflow == true) {
+ if (SymType == SymbolRef::ST_Unknown || RangeOverflow) {
// It is an external symbol (SymbolRef::ST_Unknown) or within a range
// larger than 24-bits.
StubMap::const_iterator i = Stubs.find(Value);
// These relocations are supposed to subtract the TOC address from
// the final value. This does not fit cleanly into the RuntimeDyld
// scheme, since there may be *two* sections involved in determining
- // the relocation value (the section of the symbol refered to by the
+ // the relocation value (the section of the symbol referred to by the
// relocation, and the TOC section associated with the current module).
//
// Fortunately, these relocations are currently only ever generated
- // refering to symbols that themselves reside in the TOC, which means
+ // referring to symbols that themselves reside in the TOC, which means
// that the two sections are actually the same. Thus they cancel out
// and we can immediately resolve the relocation right now.
switch (RelType) {
Addend);
else
resolveRelocation(Section, Offset, StubAddress, RelType, Addend);
- } else if (Arch == Triple::x86_64 && RelType == ELF::R_X86_64_PLT32) {
- // The way the PLT relocations normally work is that the linker allocates
- // the
- // PLT and this relocation makes a PC-relative call into the PLT. The PLT
- // entry will then jump to an address provided by the GOT. On first call,
- // the
- // GOT address will point back into PLT code that resolves the symbol. After
- // the first call, the GOT entry points to the actual function.
- //
- // For local functions we're ignoring all of that here and just replacing
- // the PLT32 relocation type with PC32, which will translate the relocation
- // into a PC-relative call directly to the function. For external symbols we
- // can't be sure the function will be within 2^32 bytes of the call site, so
- // we need to create a stub, which calls into the GOT. This case is
- // equivalent to the usual PLT implementation except that we use the stub
- // mechanism in RuntimeDyld (which puts stubs at the end of the section)
- // rather than allocating a PLT section.
- if (Value.SymbolName) {
- // This is a call to an external function.
- // Look for an existing stub.
- SectionEntry &Section = Sections[SectionID];
- StubMap::const_iterator i = Stubs.find(Value);
- uintptr_t StubAddress;
- if (i != Stubs.end()) {
+ } else if (Arch == Triple::x86_64) {
+ if (RelType == ELF::R_X86_64_PLT32) {
+ // The way the PLT relocations normally work is that the linker allocates
+ // the
+ // PLT and this relocation makes a PC-relative call into the PLT. The PLT
+ // entry will then jump to an address provided by the GOT. On first call,
+ // the
+ // GOT address will point back into PLT code that resolves the symbol. After
+ // the first call, the GOT entry points to the actual function.
+ //
+ // For local functions we're ignoring all of that here and just replacing
+ // the PLT32 relocation type with PC32, which will translate the relocation
+ // into a PC-relative call directly to the function. For external symbols we
+ // can't be sure the function will be within 2^32 bytes of the call site, so
+ // we need to create a stub, which calls into the GOT. This case is
+ // equivalent to the usual PLT implementation except that we use the stub
+ // mechanism in RuntimeDyld (which puts stubs at the end of the section)
+ // rather than allocating a PLT section.
+ if (Value.SymbolName) {
+ // This is a call to an external function.
+ // Look for an existing stub.
+ SectionEntry &Section = Sections[SectionID];
+ StubMap::const_iterator i = Stubs.find(Value);
+ uintptr_t StubAddress;
+ if (i != Stubs.end()) {
StubAddress = uintptr_t(Section.Address) + i->second;
DEBUG(dbgs() << " Stub function found\n");
- } else {
+ } else {
// Create a new stub function (equivalent to a PLT entry).
DEBUG(dbgs() << " Create a new stub function\n");
uintptr_t BaseAddress = uintptr_t(Section.Address);
uintptr_t StubAlignment = getStubAlignment();
StubAddress = (BaseAddress + Section.StubOffset + StubAlignment - 1) &
- -StubAlignment;
+ -StubAlignment;
unsigned StubOffset = StubAddress - BaseAddress;
Stubs[Value] = StubOffset;
createStubFunction((uint8_t *)StubAddress);
- // Create a GOT entry for the external function.
- GOTEntries.push_back(Value);
-
- // Make our stub function a relative call to the GOT entry.
- RelocationEntry RE(SectionID, StubOffset + 2, ELF::R_X86_64_GOTPCREL,
- -4);
- addRelocationForSymbol(RE, Value.SymbolName);
-
// Bump our stub offset counter
Section.StubOffset = StubOffset + getMaxStubSize();
+
+ // Allocate a GOT Entry
+ uint64_t GOTOffset = allocateGOTEntries(SectionID, 1);
+
+ // The load of the GOT address has an addend of -4
+ resolveGOTOffsetRelocation(SectionID, StubOffset + 2, GOTOffset - 4);
+
+ // Fill in the value of the symbol we're targeting into the GOT
+ addRelocationForSymbol(computeGOTOffsetRE(SectionID,GOTOffset,0,ELF::R_X86_64_64),
+ Value.SymbolName);
+ }
+
+ // Make the target call a call into the stub table.
+ resolveRelocation(Section, Offset, StubAddress, ELF::R_X86_64_PC32,
+ Addend);
+ } else {
+ RelocationEntry RE(SectionID, Offset, ELF::R_X86_64_PC32, Value.Addend,
+ Value.Offset);
+ addRelocationForSection(RE, Value.SectionID);
}
+ } else if (RelType == ELF::R_X86_64_GOTPCREL) {
+ uint64_t GOTOffset = allocateGOTEntries(SectionID, 1);
+ resolveGOTOffsetRelocation(SectionID, Offset, GOTOffset + Addend);
- // Make the target call a call into the stub table.
- resolveRelocation(Section, Offset, StubAddress, ELF::R_X86_64_PC32,
- Addend);
+ // Fill in the value of the symbol we're targeting into the GOT
+ RelocationEntry RE = computeGOTOffsetRE(SectionID, GOTOffset, Value.Offset, ELF::R_X86_64_64);
+ if (Value.SymbolName)
+ addRelocationForSymbol(RE, Value.SymbolName);
+ else
+ addRelocationForSection(RE, Value.SectionID);
+ } else if (RelType == ELF::R_X86_64_PC32) {
+ Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
+ processSimpleRelocation(SectionID, Offset, RelType, Value);
+ } else if (RelType == ELF::R_X86_64_PC64) {
+ Value.Addend += support::ulittle64_t::ref(computePlaceholderAddress(SectionID, Offset));
+ processSimpleRelocation(SectionID, Offset, RelType, Value);
} else {
- RelocationEntry RE(SectionID, Offset, ELF::R_X86_64_PC32, Value.Addend,
- Value.Offset);
- addRelocationForSection(RE, Value.SectionID);
+ processSimpleRelocation(SectionID, Offset, RelType, Value);
}
} else {
- if (Arch == Triple::x86_64 && RelType == ELF::R_X86_64_GOTPCREL) {
- GOTEntries.push_back(Value);
+ if (Arch == Triple::x86) {
+ Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
}
- RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, Value.Offset);
- if (Value.SymbolName)
- addRelocationForSymbol(RE, Value.SymbolName);
- else
- addRelocationForSection(RE, Value.SectionID);
+ processSimpleRelocation(SectionID, Offset, RelType, Value);
}
return ++RelI;
}
-void RuntimeDyldELF::updateGOTEntries(StringRef Name, uint64_t Addr) {
-
- SmallVectorImpl<std::pair<SID, GOTRelocations>>::iterator it;
- SmallVectorImpl<std::pair<SID, GOTRelocations>>::iterator end = GOTs.end();
-
- for (it = GOTs.begin(); it != end; ++it) {
- GOTRelocations &GOTEntries = it->second;
- for (int i = 0, e = GOTEntries.size(); i != e; ++i) {
- if (GOTEntries[i].SymbolName != nullptr &&
- GOTEntries[i].SymbolName == Name) {
- GOTEntries[i].Offset = Addr;
- }
- }
- }
-}
-
size_t RuntimeDyldELF::getGOTEntrySize() {
// We don't use the GOT in all of these cases, but it's essentially free
// to put them all here.
case Triple::x86:
case Triple::arm:
case Triple::thumb:
+ Result = sizeof(uint32_t);
+ break;
case Triple::mips:
case Triple::mipsel:
- Result = sizeof(uint32_t);
+ case Triple::mips64:
+ case Triple::mips64el:
+ if (IsMipsO32ABI)
+ Result = sizeof(uint32_t);
+ else if (IsMipsN64ABI)
+ Result = sizeof(uint64_t);
+ else
+ llvm_unreachable("Mips ABI not handled");
break;
default:
llvm_unreachable("Unsupported CPU type!");
return Result;
}
-uint64_t RuntimeDyldELF::findGOTEntry(uint64_t LoadAddress, uint64_t Offset) {
-
- const size_t GOTEntrySize = getGOTEntrySize();
-
- SmallVectorImpl<std::pair<SID, GOTRelocations>>::const_iterator it;
- SmallVectorImpl<std::pair<SID, GOTRelocations>>::const_iterator end =
- GOTs.end();
-
- int GOTIndex = -1;
- for (it = GOTs.begin(); it != end; ++it) {
- SID GOTSectionID = it->first;
- const GOTRelocations &GOTEntries = it->second;
-
- // Find the matching entry in our vector.
- uint64_t SymbolOffset = 0;
- for (int i = 0, e = GOTEntries.size(); i != e; ++i) {
- if (!GOTEntries[i].SymbolName) {
- if (getSectionLoadAddress(GOTEntries[i].SectionID) == LoadAddress &&
- GOTEntries[i].Offset == Offset) {
- GOTIndex = i;
- SymbolOffset = GOTEntries[i].Offset;
- break;
- }
- } else {
- // GOT entries for external symbols use the addend as the address when
- // the external symbol has been resolved.
- if (GOTEntries[i].Offset == LoadAddress) {
- GOTIndex = i;
- // Don't use the Addend here. The relocation handler will use it.
- break;
- }
- }
- }
-
- if (GOTIndex != -1) {
- if (GOTEntrySize == sizeof(uint64_t)) {
- uint64_t *LocalGOTAddr = (uint64_t *)getSectionAddress(GOTSectionID);
- // Fill in this entry with the address of the symbol being referenced.
- LocalGOTAddr[GOTIndex] = LoadAddress + SymbolOffset;
- } else {
- uint32_t *LocalGOTAddr = (uint32_t *)getSectionAddress(GOTSectionID);
- // Fill in this entry with the address of the symbol being referenced.
- LocalGOTAddr[GOTIndex] = (uint32_t)(LoadAddress + SymbolOffset);
- }
-
- // Calculate the load address of this entry
- return getSectionLoadAddress(GOTSectionID) + (GOTIndex * GOTEntrySize);
- }
+uint64_t RuntimeDyldELF::allocateGOTEntries(unsigned SectionID, unsigned no)
+{
+ (void)SectionID; // The GOT Section is the same for all section in the object file
+ if (GOTSectionID == 0) {
+ GOTSectionID = Sections.size();
+ // Reserve a section id. We'll allocate the section later
+ // once we know the total size
+ Sections.push_back(SectionEntry(".got", nullptr, 0, 0));
}
+ uint64_t StartOffset = CurrentGOTIndex * getGOTEntrySize();
+ CurrentGOTIndex += no;
+ return StartOffset;
+}
- assert(GOTIndex != -1 && "Unable to find requested GOT entry.");
- return 0;
+void RuntimeDyldELF::resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset, uint64_t GOTOffset)
+{
+ // Fill in the relative address of the GOT Entry into the stub
+ RelocationEntry GOTRE(SectionID, Offset, ELF::R_X86_64_PC32, GOTOffset);
+ addRelocationForSection(GOTRE, GOTSectionID);
+}
+
+RelocationEntry RuntimeDyldELF::computeGOTOffsetRE(unsigned SectionID, uint64_t GOTOffset, uint64_t SymbolOffset,
+ uint32_t Type)
+{
+ (void)SectionID; // The GOT Section is the same for all section in the object file
+ return RelocationEntry(GOTSectionID, GOTOffset, Type, SymbolOffset);
}
-void RuntimeDyldELF::finalizeLoad(ObjectImage &ObjImg,
+void RuntimeDyldELF::finalizeLoad(const ObjectFile &Obj,
ObjSectionToIDMap &SectionMap) {
+ if (IsMipsO32ABI)
+ if (!PendingRelocs.empty())
+ report_fatal_error("Can't find matching LO16 reloc");
+
// If necessary, allocate the global offset table
- if (MemMgr) {
- // Allocate the GOT if necessary
- size_t numGOTEntries = GOTEntries.size();
- if (numGOTEntries != 0) {
- // Allocate memory for the section
- unsigned SectionID = Sections.size();
- size_t TotalSize = numGOTEntries * getGOTEntrySize();
- uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, getGOTEntrySize(),
- SectionID, ".got", false);
- if (!Addr)
- report_fatal_error("Unable to allocate memory for GOT!");
-
- GOTs.push_back(std::make_pair(SectionID, GOTEntries));
- Sections.push_back(SectionEntry(".got", Addr, TotalSize, 0));
- // For now, initialize all GOT entries to zero. We'll fill them in as
- // needed when GOT-based relocations are applied.
- memset(Addr, 0, TotalSize);
+ if (GOTSectionID != 0) {
+ // Allocate memory for the section
+ size_t TotalSize = CurrentGOTIndex * getGOTEntrySize();
+ uint8_t *Addr = MemMgr.allocateDataSection(TotalSize, getGOTEntrySize(),
+ GOTSectionID, ".got", false);
+ if (!Addr)
+ report_fatal_error("Unable to allocate memory for GOT!");
+
+ Sections[GOTSectionID] = SectionEntry(".got", Addr, TotalSize, 0);
+
+ if (Checker)
+ Checker->registerSection(Obj.getFileName(), GOTSectionID);
+
+ // For now, initialize all GOT entries to zero. We'll fill them in as
+ // needed when GOT-based relocations are applied.
+ memset(Addr, 0, TotalSize);
+ if (IsMipsN64ABI) {
+ // To correctly resolve Mips GOT relocations, we need a mapping from
+ // object's sections to GOTs.
+ for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
+ SI != SE; ++SI) {
+ if (SI->relocation_begin() != SI->relocation_end()) {
+ section_iterator RelocatedSection = SI->getRelocatedSection();
+ ObjSectionToIDMap::iterator i = SectionMap.find(*RelocatedSection);
+ assert (i != SectionMap.end());
+ SectionToGOTMap[i->second] = GOTSectionID;
+ }
+ }
+ GOTSymbolOffsets.clear();
}
- } else {
- report_fatal_error("Unable to allocate memory for GOT!");
}
// Look for and record the EH frame section.
break;
}
}
-}
-bool RuntimeDyldELF::isCompatibleFormat(const ObjectBuffer *Buffer) const {
- if (Buffer->getBufferSize() < strlen(ELF::ElfMagic))
- return false;
- return (memcmp(Buffer->getBufferStart(), ELF::ElfMagic,
- strlen(ELF::ElfMagic))) == 0;
+ GOTSectionID = 0;
+ CurrentGOTIndex = 0;
}
-bool RuntimeDyldELF::isCompatibleFile(const object::ObjectFile *Obj) const {
- return Obj->isELF();
+bool RuntimeDyldELF::isCompatibleFile(const object::ObjectFile &Obj) const {
+ return Obj.isELF();
}
} // namespace llvm