RuntimeDyldELF.cpp [plain text]
#include "RuntimeDyldELF.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/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"
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 Elf_Shdr_Impl<ELFT> Elf_Shdr;
typedef Elf_Sym_Impl<ELFT> Elf_Sym;
typedef Elf_Rel_Impl<ELFT, false> Elf_Rel;
typedef Elf_Rel_Impl<ELFT, true> Elf_Rela;
typedef Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type;
public:
DyldELFObject(MemoryBufferRef Wrapper, std::error_code &ec);
void updateSectionAddress(const SectionRef &Sec, uint64_t Addr);
void updateSymbolAddress(const SymbolRef &SymRef, uint64_t Addr);
static inline bool classof(const Binary *v) {
return (isa<ELFObjectFile<ELFT>>(v) &&
classof(cast<ELFObjectFile<ELFT>>(v)));
}
static inline bool classof(const ELFObjectFile<ELFT> *v) {
return v->isDyldType();
}
};
template <class ELFT>
DyldELFObject<ELFT>::DyldELFObject(MemoryBufferRef Wrapper, std::error_code &EC)
: ELFObjectFile<ELFT>(Wrapper, EC) {
this->isDyldELFObject = true;
}
template <class ELFT>
void DyldELFObject<ELFT>::updateSectionAddress(const SectionRef &Sec,
uint64_t Addr) {
DataRefImpl ShdrRef = Sec.getRawDataRefImpl();
Elf_Shdr *shdr =
const_cast<Elf_Shdr *>(reinterpret_cast<const Elf_Shdr *>(ShdrRef.p));
shdr->sh_addr = static_cast<addr_type>(Addr);
}
template <class ELFT>
void DyldELFObject<ELFT>::updateSymbolAddress(const SymbolRef &SymRef,
uint64_t Addr) {
Elf_Sym *sym = const_cast<Elf_Sym *>(
ELFObjectFile<ELFT>::getSymbol(SymRef.getRawDataRefImpl()));
sym->st_value = static_cast<addr_type>(Addr);
}
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);
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)) {
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);
}
}
namespace llvm {
RuntimeDyldELF::RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr,
RuntimeDyld::SymbolResolver &Resolver)
: RuntimeDyldImpl(MemMgr, Resolver), GOTSectionID(0), CurrentGOTIndex(0) {}
RuntimeDyldELF::~RuntimeDyldELF() {}
void RuntimeDyldELF::registerEHFrames() {
for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) {
SID EHFrameSID = UnregisteredEHFrameSections[i];
uint8_t *EHFrameAddr = Sections[EHFrameSID].getAddress();
uint64_t EHFrameLoadAddr = Sections[EHFrameSID].getLoadAddress();
size_t EHFrameSize = Sections[EHFrameSID].getSize();
MemMgr.registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
RegisteredEHFrameSections.push_back(EHFrameSID);
}
UnregisteredEHFrameSections.clear();
}
void RuntimeDyldELF::deregisterEHFrames() {
for (int i = 0, e = RegisteredEHFrameSections.size(); i != e; ++i) {
SID EHFrameSID = RegisteredEHFrameSections[i];
uint8_t *EHFrameAddr = Sections[EHFrameSID].getAddress();
uint64_t EHFrameLoadAddr = Sections[EHFrameSID].getLoadAddress();
size_t EHFrameSize = Sections[EHFrameSID].getSize();
MemMgr.deregisterEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
}
RegisteredEHFrameSections.clear();
}
std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
RuntimeDyldELF::loadObject(const object::ObjectFile &O) {
return llvm::make_unique<LoadedELFObjectInfo>(*this, loadObjectImpl(O));
}
void RuntimeDyldELF::resolveX86_64Relocation(const SectionEntry &Section,
uint64_t Offset, uint64_t Value,
uint32_t Type, int64_t Addend,
uint64_t SymOffset) {
switch (Type) {
default:
llvm_unreachable("Relocation type not implemented yet!");
break;
case ELF::R_X86_64_64: {
support::ulittle64_t::ref(Section.getAddressWithOffset(Offset)) =
Value + Addend;
DEBUG(dbgs() << "Writing " << format("%p", (Value + Addend)) << " at "
<< format("%p\n", Section.getAddressWithOffset(Offset)));
break;
}
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S: {
Value += Addend;
assert((Type == ELF::R_X86_64_32 && (Value <= UINT32_MAX)) ||
(Type == ELF::R_X86_64_32S &&
((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN)));
uint32_t TruncatedAddr = (Value & 0xFFFFFFFF);
support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) =
TruncatedAddr;
DEBUG(dbgs() << "Writing " << format("%p", TruncatedAddr) << " at "
<< format("%p\n", Section.getAddressWithOffset(Offset)));
break;
}
case ELF::R_X86_64_PC8: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
int64_t RealOffset = Value + Addend - FinalAddress;
assert(isInt<8>(RealOffset));
int8_t TruncOffset = (RealOffset & 0xFF);
Section.getAddress()[Offset] = TruncOffset;
break;
}
case ELF::R_X86_64_PC32: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
int64_t RealOffset = Value + Addend - FinalAddress;
assert(isInt<32>(RealOffset));
int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) =
TruncOffset;
break;
}
case ELF::R_X86_64_PC64: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
int64_t RealOffset = Value + Addend - FinalAddress;
support::ulittle64_t::ref(Section.getAddressWithOffset(Offset)) =
RealOffset;
break;
}
}
}
void RuntimeDyldELF::resolveX86Relocation(const SectionEntry &Section,
uint64_t Offset, uint32_t Value,
uint32_t Type, int32_t Addend) {
switch (Type) {
case ELF::R_386_32: {
support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) =
Value + Addend;
break;
}
case ELF::R_386_PC32: {
uint32_t FinalAddress =
Section.getLoadAddressWithOffset(Offset) & 0xFFFFFFFF;
uint32_t RealOffset = Value + Addend - FinalAddress;
support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) =
RealOffset;
break;
}
default:
llvm_unreachable("Relocation type not implemented yet!");
break;
}
}
void RuntimeDyldELF::resolveAArch64Relocation(const SectionEntry &Section,
uint64_t Offset, uint64_t Value,
uint32_t Type, int64_t Addend) {
uint32_t *TargetPtr =
reinterpret_cast<uint32_t *>(Section.getAddressWithOffset(Offset));
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
DEBUG(dbgs() << "resolveAArch64Relocation, LocalAddress: 0x"
<< format("%llx", Section.getAddressWithOffset(Offset))
<< " FinalAddress: 0x" << format("%llx", FinalAddress)
<< " Value: 0x" << format("%llx", Value) << " Type: 0x"
<< format("%x", Type) << " Addend: 0x" << format("%llx", Addend)
<< "\n");
switch (Type) {
default:
llvm_unreachable("Relocation type not implemented yet!");
break;
case ELF::R_AARCH64_ABS64: {
uint64_t *TargetPtr =
reinterpret_cast<uint64_t *>(Section.getAddressWithOffset(Offset));
*TargetPtr = Value + Addend;
break;
}
case ELF::R_AARCH64_PREL32: {
uint64_t Result = Value + Addend - FinalAddress;
assert(static_cast<int64_t>(Result) >= INT32_MIN &&
static_cast<int64_t>(Result) <= UINT32_MAX);
*TargetPtr = static_cast<uint32_t>(Result & 0xffffffffU);
break;
}
case ELF::R_AARCH64_CALL26: case ELF::R_AARCH64_JUMP26: {
uint64_t BranchImm = Value + Addend - FinalAddress;
assert(isInt<28>(BranchImm));
*TargetPtr &= 0xfc000000U;
*TargetPtr |= static_cast<uint32_t>(BranchImm & 0xffffffcU) >> 2;
break;
}
case ELF::R_AARCH64_MOVW_UABS_G3: {
uint64_t Result = Value + Addend;
*TargetPtr &= 0xffe0001fU;
*TargetPtr |= Result >> (48 - 5);
assert((*TargetPtr >> 21 & 0x3) == 3 && "invalid shift for relocation");
break;
}
case ELF::R_AARCH64_MOVW_UABS_G2_NC: {
uint64_t Result = Value + Addend;
*TargetPtr &= 0xffe0001fU;
*TargetPtr |= ((Result & 0xffff00000000ULL) >> (32 - 5));
assert((*TargetPtr >> 21 & 0x3) == 2 && "invalid shift for relocation");
break;
}
case ELF::R_AARCH64_MOVW_UABS_G1_NC: {
uint64_t Result = Value + Addend;
*TargetPtr &= 0xffe0001fU;
*TargetPtr |= ((Result & 0xffff0000U) >> (16 - 5));
assert((*TargetPtr >> 21 & 0x3) == 1 && "invalid shift for relocation");
break;
}
case ELF::R_AARCH64_MOVW_UABS_G0_NC: {
uint64_t Result = Value + Addend;
*TargetPtr &= 0xffe0001fU;
*TargetPtr |= ((Result & 0xffffU) << 5);
assert((*TargetPtr >> 21 & 0x3) == 0 && "invalid shift for relocation");
break;
}
case ELF::R_AARCH64_ADR_PREL_PG_HI21: {
uint64_t Result =
((Value + Addend) & ~0xfffULL) - (FinalAddress & ~0xfffULL);
assert(isInt<33>(Result) && "overflow check failed for relocation");
*TargetPtr &= 0x9f00001fU;
*TargetPtr |= ((Result & 0x3000U) << (29 - 12));
*TargetPtr |= ((Result & 0x1ffffc000ULL) >> (14 - 5));
break;
}
case ELF::R_AARCH64_LDST32_ABS_LO12_NC: {
uint64_t Result = Value + Addend;
*TargetPtr &= 0xffc003ffU;
*TargetPtr |= ((Result & 0xffc) << (10 - 2));
break;
}
case ELF::R_AARCH64_LDST64_ABS_LO12_NC: {
uint64_t Result = Value + Addend;
*TargetPtr &= 0xffc003ffU;
*TargetPtr |= ((Result & 0xff8) << (10 - 3));
break;
}
}
}
void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
uint64_t Offset, uint32_t Value,
uint32_t Type, int32_t Addend) {
uint32_t *TargetPtr =
reinterpret_cast<uint32_t *>(Section.getAddressWithOffset(Offset));
uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset) & 0xFFFFFFFF;
Value += Addend;
DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: "
<< Section.getAddressWithOffset(Offset)
<< " FinalAddress: " << format("%p", FinalAddress) << " Value: "
<< format("%x", Value) << " Type: " << format("%x", Type)
<< " Addend: " << format("%x", Addend) << "\n");
switch (Type) {
default:
llvm_unreachable("Not implemented relocation type!");
case ELF::R_ARM_NONE:
break;
case ELF::R_ARM_PREL31:
case ELF::R_ARM_TARGET1:
case ELF::R_ARM_ABS32:
*TargetPtr = Value;
break;
case ELF::R_ARM_MOVW_ABS_NC:
case ELF::R_ARM_MOVT_ABS:
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;
case ELF::R_ARM_PC24: case ELF::R_ARM_CALL: case ELF::R_ARM_JUMP24:
int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8);
RelValue = (RelValue & 0x03FFFFFC) >> 2;
assert((*TargetPtr & 0xFFFFFF) == 0xFFFFFE);
*TargetPtr &= 0xFF000000;
*TargetPtr |= RelValue;
break;
}
}
void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section,
uint64_t Offset, uint32_t Value,
uint32_t Type, int32_t Addend) {
uint8_t *TargetPtr = Section.getAddressWithOffset(Offset);
Value += Addend;
DEBUG(dbgs() << "resolveMIPSRelocation, LocalAddress: "
<< Section.getAddressWithOffset(Offset) << " FinalAddress: "
<< format("%p", Section.getLoadAddressWithOffset(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:
writeBytesUnaligned(Value, TargetPtr, 4);
break;
case ELF::R_MIPS_26:
Insn &= 0xfc000000;
Insn |= (Value & 0x0fffffff) >> 2;
writeBytesUnaligned(Insn, TargetPtr, 4);
break;
case ELF::R_MIPS_HI16:
Insn &= 0xffff0000;
Insn |= ((Value + 0x8000) >> 16) & 0xffff;
writeBytesUnaligned(Insn, TargetPtr, 4);
break;
case ELF::R_MIPS_LO16:
Insn &= 0xffff0000;
Insn |= Value & 0xffff;
writeBytesUnaligned(Insn, TargetPtr, 4);
break;
case ELF::R_MIPS_PC32: {
uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
writeBytesUnaligned(Value - FinalAddress, (uint8_t *)TargetPtr, 4);
break;
}
case ELF::R_MIPS_PC16: {
uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Insn &= 0xffff0000;
Insn |= ((Value - FinalAddress) >> 2) & 0xffff;
writeBytesUnaligned(Insn, TargetPtr, 4);
break;
}
case ELF::R_MIPS_PC19_S2: {
uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Insn &= 0xfff80000;
Insn |= ((Value - (FinalAddress & ~0x3)) >> 2) & 0x7ffff;
writeBytesUnaligned(Insn, TargetPtr, 4);
break;
}
case ELF::R_MIPS_PC21_S2: {
uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Insn &= 0xffe00000;
Insn |= ((Value - FinalAddress) >> 2) & 0x1fffff;
writeBytesUnaligned(Insn, TargetPtr, 4);
break;
}
case ELF::R_MIPS_PC26_S2: {
uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Insn &= 0xfc000000;
Insn |= ((Value - FinalAddress) >> 2) & 0x3ffffff;
writeBytesUnaligned(Insn, TargetPtr, 4);
break;
}
case ELF::R_MIPS_PCHI16: {
uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
Insn &= 0xffff0000;
Insn |= ((Value - FinalAddress + 0x8000) >> 16) & 0xffff;
writeBytesUnaligned(Insn, TargetPtr, 4);
break;
}
case ELF::R_MIPS_PCLO16: {
uint32_t FinalAddress = Section.getLoadAddressWithOffset(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;
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.getAddressWithOffset(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.getAddressWithOffset(Offset))
<< " FinalAddress: 0x"
<< format("%llx", Section.getLoadAddressWithOffset(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:
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.getLoadAddressWithOffset(Offset);
return ((Value + Addend - FinalAddress) >> 2) & 0xffff;
}
case ELF::R_MIPS_PC32: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
return Value + Addend - FinalAddress;
}
case ELF::R_MIPS_PC18_S3: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
return ((Value + Addend - (FinalAddress & ~0x7)) >> 3) & 0x3ffff;
}
case ELF::R_MIPS_PC19_S2: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
return ((Value + Addend - (FinalAddress & ~0x3)) >> 2) & 0x7ffff;
}
case ELF::R_MIPS_PC21_S2: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
return ((Value + Addend - FinalAddress) >> 2) & 0x1fffff;
}
case ELF::R_MIPS_PC26_S2: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
return ((Value + Addend - FinalAddress) >> 2) & 0x3ffffff;
}
case ELF::R_MIPS_PCHI16: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
return ((Value + Addend - FinalAddress + 0x8000) >> 16) & 0xffff;
}
case ELF::R_MIPS_PCLO16: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(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;
}
}
void RuntimeDyldELF::findPPC64TOCSection(const ELFObjectFileBase &Obj,
ObjSectionToIDMap &LocalSections,
RelocationValueRef &Rel) {
Rel.SymbolName = nullptr;
Rel.SectionID = 0;
for (auto &Section: Obj.sections()) {
StringRef SectionName;
check(Section.getName(SectionName));
if (SectionName == ".got"
|| SectionName == ".toc"
|| SectionName == ".tocbss"
|| SectionName == ".plt") {
Rel.SectionID = findOrEmitSection(Obj, Section, false, LocalSections);
break;
}
}
Rel.Addend = 0x8000;
}
void RuntimeDyldELF::findOPDEntrySection(const ELFObjectFileBase &Obj,
ObjSectionToIDMap &LocalSections,
RelocationValueRef &Rel) {
for (section_iterator si = Obj.section_begin(), se = Obj.section_end();
si != se; ++si) {
section_iterator RelSecI = si->getRelocatedSection();
if (RelSecI == Obj.section_end())
continue;
StringRef RelSectionName;
check(RelSecI->getName(RelSectionName));
if (RelSectionName != ".opd")
continue;
for (elf_relocation_iterator i = si->relocation_begin(),
e = si->relocation_end();
i != e;) {
uint64_t TypeFunc = i->getType();
if (TypeFunc != ELF::R_PPC64_ADDR64) {
++i;
continue;
}
uint64_t TargetSymbolOffset = i->getOffset();
symbol_iterator TargetSymbol = i->getSymbol();
ErrorOr<int64_t> AddendOrErr = i->getAddend();
Check(AddendOrErr.getError());
int64_t Addend = *AddendOrErr;
++i;
if (i == e)
break;
uint64_t TypeTOC = i->getType();
if (TypeTOC != ELF::R_PPC64_TOC)
continue;
if (Rel.Addend != (int64_t)TargetSymbolOffset)
continue;
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;
}
}
llvm_unreachable("Attempting to get address of ODP entry!");
}
static inline uint16_t applyPPClo(uint64_t value) { return value & 0xffff; }
static inline uint16_t applyPPChi(uint64_t value) {
return (value >> 16) & 0xffff;
}
static inline uint16_t applyPPCha (uint64_t value) {
return ((value + 0x8000) >> 16) & 0xffff;
}
static inline uint16_t applyPPChigher(uint64_t value) {
return (value >> 32) & 0xffff;
}
static inline uint16_t applyPPChighera (uint64_t value) {
return ((value + 0x8000) >> 32) & 0xffff;
}
static inline uint16_t applyPPChighest(uint64_t value) {
return (value >> 48) & 0xffff;
}
static inline uint16_t applyPPChighesta (uint64_t value) {
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.getAddressWithOffset(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) {
uint8_t *LocalAddress = Section.getAddressWithOffset(Offset);
switch (Type) {
default:
llvm_unreachable("Relocation type not implemented yet!");
break;
case ELF::R_PPC64_ADDR16:
writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
break;
case ELF::R_PPC64_ADDR16_DS:
writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3);
break;
case ELF::R_PPC64_ADDR16_LO:
writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
break;
case ELF::R_PPC64_ADDR16_LO_DS:
writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3);
break;
case ELF::R_PPC64_ADDR16_HI:
writeInt16BE(LocalAddress, applyPPChi(Value + Addend));
break;
case ELF::R_PPC64_ADDR16_HA:
writeInt16BE(LocalAddress, applyPPCha(Value + Addend));
break;
case ELF::R_PPC64_ADDR16_HIGHER:
writeInt16BE(LocalAddress, applyPPChigher(Value + Addend));
break;
case ELF::R_PPC64_ADDR16_HIGHERA:
writeInt16BE(LocalAddress, applyPPChighera(Value + Addend));
break;
case ELF::R_PPC64_ADDR16_HIGHEST:
writeInt16BE(LocalAddress, applyPPChighest(Value + Addend));
break;
case ELF::R_PPC64_ADDR16_HIGHESTA:
writeInt16BE(LocalAddress, applyPPChighesta(Value + Addend));
break;
case ELF::R_PPC64_ADDR14: {
assert(((Value + Addend) & 3) == 0);
uint8_t aalk = *(LocalAddress + 3);
writeInt16BE(LocalAddress + 2, (aalk & 3) | ((Value + Addend) & 0xfffc));
} break;
case ELF::R_PPC64_REL16_LO: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
uint64_t Delta = Value - FinalAddress + Addend;
writeInt16BE(LocalAddress, applyPPClo(Delta));
} break;
case ELF::R_PPC64_REL16_HI: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
uint64_t Delta = Value - FinalAddress + Addend;
writeInt16BE(LocalAddress, applyPPChi(Delta));
} break;
case ELF::R_PPC64_REL16_HA: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
uint64_t Delta = Value - FinalAddress + Addend;
writeInt16BE(LocalAddress, applyPPCha(Delta));
} break;
case ELF::R_PPC64_ADDR32: {
int32_t Result = static_cast<int32_t>(Value + Addend);
if (SignExtend32<32>(Result) != Result)
llvm_unreachable("Relocation R_PPC64_ADDR32 overflow");
writeInt32BE(LocalAddress, Result);
} break;
case ELF::R_PPC64_REL24: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
if (SignExtend32<26>(delta) != delta)
llvm_unreachable("Relocation R_PPC64_REL24 overflow");
writeInt32BE(LocalAddress, 0x48000001 | (delta & 0x03FFFFFC));
} break;
case ELF::R_PPC64_REL32: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
if (SignExtend32<32>(delta) != delta)
llvm_unreachable("Relocation R_PPC64_REL32 overflow");
writeInt32BE(LocalAddress, delta);
} break;
case ELF::R_PPC64_REL64: {
uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
uint64_t Delta = Value - FinalAddress + Addend;
writeInt64BE(LocalAddress, Delta);
} break;
case ELF::R_PPC64_ADDR64:
writeInt64BE(LocalAddress, Value + Addend);
break;
}
}
void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section,
uint64_t Offset, uint64_t Value,
uint32_t Type, int64_t Addend) {
uint8_t *LocalAddress = Section.getAddressWithOffset(Offset);
switch (Type) {
default:
llvm_unreachable("Relocation type not implemented yet!");
break;
case ELF::R_390_PC16DBL:
case ELF::R_390_PLT16DBL: {
int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset);
assert(int16_t(Delta / 2) * 2 == Delta && "R_390_PC16DBL overflow");
writeInt16BE(LocalAddress, Delta / 2);
break;
}
case ELF::R_390_PC32DBL:
case ELF::R_390_PLT32DBL: {
int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset);
assert(int32_t(Delta / 2) * 2 == Delta && "R_390_PC32DBL overflow");
writeInt32BE(LocalAddress, Delta / 2);
break;
}
case ELF::R_390_PC32: {
int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset);
assert(int32_t(Delta) == Delta && "R_390_PC32 overflow");
writeInt32BE(LocalAddress, Delta);
break;
}
case ELF::R_390_64:
writeInt64BE(LocalAddress, Value + Addend);
break;
case ELF::R_390_PC64: {
int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset);
writeInt64BE(LocalAddress, Delta);
break;
}
}
}
void RuntimeDyldELF::resolveRelocation(const RelocationEntry &RE,
uint64_t Value) {
const SectionEntry &Section = Sections[RE.SectionID];
return resolveRelocation(Section, RE.Offset, Value, RE.RelType, RE.Addend,
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, SID SectionID) {
switch (Arch) {
case Triple::x86_64:
resolveX86_64Relocation(Section, Offset, Value, Type, Addend, SymOffset);
break;
case Triple::x86:
resolveX86Relocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
case Triple::aarch64:
case Triple::aarch64_be:
resolveAArch64Relocation(Section, Offset, Value, Type, Addend);
break;
case Triple::arm: case Triple::armeb:
case Triple::thumb:
case Triple::thumbeb:
resolveARMRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
case Triple::mips: case Triple::mipsel:
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: case Triple::ppc64le:
resolvePPC64Relocation(Section, Offset, Value, Type, Addend);
break;
case Triple::systemz:
resolveSystemZRelocation(Section, Offset, Value, Type, Addend);
break;
default:
llvm_unreachable("Unsupported CPU type!");
}
}
void *RuntimeDyldELF::computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const {
return (void *)(Sections[SectionID].getObjAddress() + 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, 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();
StringRef 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;
SymbolRef::Type SymType = SymbolRef::ST_Unknown;
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 {
switch (SymType) {
case SymbolRef::ST_Debug: {
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;
if (!Value.SymbolName)
Value.SymbolName = "";
break;
}
default:
llvm_unreachable("Unresolved symbol type!");
break;
}
}
uint64_t Offset = RelI->getOffset();
DEBUG(dbgs() << "\t\tSectionID: " << SectionID << " Offset: " << Offset
<< "\n");
if ((Arch == Triple::aarch64 || Arch == Triple::aarch64_be) &&
(RelType == ELF::R_AARCH64_CALL26 || RelType == ELF::R_AARCH64_JUMP26)) {
DEBUG(dbgs() << "\t\tThis is an AArch64 branch relocation.");
SectionEntry &Section = Sections[SectionID];
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end()) {
resolveRelocation(Section, Offset,
(uint64_t)Section.getAddressWithOffset(i->second),
RelType, 0);
DEBUG(dbgs() << " Stub function found\n");
} else {
DEBUG(dbgs() << " Create a new stub function\n");
Stubs[Value] = Section.getStubOffset();
uint8_t *StubTargetAddr = createStubFunction(
Section.getAddressWithOffset(Section.getStubOffset()));
RelocationEntry REmovz_g3(SectionID,
StubTargetAddr - Section.getAddress(),
ELF::R_AARCH64_MOVW_UABS_G3, Value.Addend);
RelocationEntry REmovk_g2(SectionID, StubTargetAddr -
Section.getAddress() + 4,
ELF::R_AARCH64_MOVW_UABS_G2_NC, Value.Addend);
RelocationEntry REmovk_g1(SectionID, StubTargetAddr -
Section.getAddress() + 8,
ELF::R_AARCH64_MOVW_UABS_G1_NC, Value.Addend);
RelocationEntry REmovk_g0(SectionID, StubTargetAddr -
Section.getAddress() + 12,
ELF::R_AARCH64_MOVW_UABS_G0_NC, Value.Addend);
if (Value.SymbolName) {
addRelocationForSymbol(REmovz_g3, Value.SymbolName);
addRelocationForSymbol(REmovk_g2, Value.SymbolName);
addRelocationForSymbol(REmovk_g1, Value.SymbolName);
addRelocationForSymbol(REmovk_g0, Value.SymbolName);
} else {
addRelocationForSection(REmovz_g3, Value.SectionID);
addRelocationForSection(REmovk_g2, Value.SectionID);
addRelocationForSection(REmovk_g1, Value.SectionID);
addRelocationForSection(REmovk_g0, Value.SectionID);
}
resolveRelocation(Section, Offset,
reinterpret_cast<uint64_t>(Section.getAddressWithOffset(
Section.getStubOffset())),
RelType, 0);
Section.advanceStubOffset(getMaxStubSize());
}
} else if (Arch == Triple::arm) {
if (RelType == ELF::R_ARM_PC24 || RelType == ELF::R_ARM_CALL ||
RelType == ELF::R_ARM_JUMP24) {
DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.");
SectionEntry &Section = Sections[SectionID];
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end()) {
resolveRelocation(
Section, Offset,
reinterpret_cast<uint64_t>(Section.getAddressWithOffset(i->second)),
RelType, 0);
DEBUG(dbgs() << " Stub function found\n");
} else {
DEBUG(dbgs() << " Create a new stub function\n");
Stubs[Value] = Section.getStubOffset();
uint8_t *StubTargetAddr = createStubFunction(
Section.getAddressWithOffset(Section.getStubOffset()));
RelocationEntry RE(SectionID, StubTargetAddr - Section.getAddress(),
ELF::R_ARM_ABS32, Value.Addend);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
resolveRelocation(Section, Offset, reinterpret_cast<uint64_t>(
Section.getAddressWithOffset(
Section.getStubOffset())),
RelType, 0);
Section.advanceStubOffset(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) {
Value.Addend += (int16_t)((*Placeholder & 0xFFF) | (((*Placeholder >> 16) & 0xF) << 12));
}
processSimpleRelocation(SectionID, Offset, RelType, Value);
}
} 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) {
DEBUG(dbgs() << "\t\tThis is a Mips branch relocation.");
SectionEntry &Section = Sections[SectionID];
uint32_t Addend = (Opcode & 0x03ffffff) << 2;
Value.Addend += Addend;
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 {
DEBUG(dbgs() << " Create a new stub function\n");
Stubs[Value] = Section.getStubOffset();
uint8_t *StubTargetAddr = createStubFunction(
Section.getAddressWithOffset(Section.getStubOffset()));
RelocationEntry REHi(SectionID, StubTargetAddr - Section.getAddress(),
ELF::R_MIPS_HI16, Value.Addend);
RelocationEntry RELo(SectionID,
StubTargetAddr - Section.getAddress() + 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);
}
RelocationEntry RE(SectionID, Offset, RelType, Section.getStubOffset());
addRelocationForSection(RE, SectionID);
Section.advanceStubOffset(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) {
unsigned AbiVariant;
Obj.getPlatformFlags(AbiVariant);
AbiVariant &= ELF::EF_PPC64_ABI;
SectionEntry &Section = Sections[SectionID];
uint8_t *Target = Section.getAddressWithOffset(Offset);
bool RangeOverflow = false;
if (SymType != SymbolRef::ST_Unknown) {
if (AbiVariant != 2) {
findOPDEntrySection(Obj, ObjSectionToID, Value);
} else {
uint8_t SymOther = Symbol->getOther();
Value.Addend += ELF::decodePPC64LocalEntryOffset(SymOther);
}
uint8_t *RelocTarget =
Sections[Value.SectionID].getAddressWithOffset(Value.Addend);
int32_t delta = static_cast<int32_t>(Target - RelocTarget);
if (SignExtend32<26>(delta) == delta) {
RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
} else {
RangeOverflow = true;
}
}
if (SymType == SymbolRef::ST_Unknown || RangeOverflow) {
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end()) {
resolveRelocation(Section, Offset,
reinterpret_cast<uint64_t>(
Section.getAddressWithOffset(i->second)),
RelType, 0);
DEBUG(dbgs() << " Stub function found\n");
} else {
DEBUG(dbgs() << " Create a new stub function\n");
Stubs[Value] = Section.getStubOffset();
uint8_t *StubTargetAddr = createStubFunction(
Section.getAddressWithOffset(Section.getStubOffset()),
AbiVariant);
RelocationEntry RE(SectionID, StubTargetAddr - Section.getAddress(),
ELF::R_PPC64_ADDR64, Value.Addend);
uint64_t StubRelocOffset = StubTargetAddr - Section.getAddress();
if (!IsTargetLittleEndian)
StubRelocOffset += 2;
RelocationEntry REhst(SectionID, StubRelocOffset + 0,
ELF::R_PPC64_ADDR16_HIGHEST, Value.Addend);
RelocationEntry REhr(SectionID, StubRelocOffset + 4,
ELF::R_PPC64_ADDR16_HIGHER, Value.Addend);
RelocationEntry REh(SectionID, StubRelocOffset + 12,
ELF::R_PPC64_ADDR16_HI, Value.Addend);
RelocationEntry REl(SectionID, StubRelocOffset + 16,
ELF::R_PPC64_ADDR16_LO, Value.Addend);
if (Value.SymbolName) {
addRelocationForSymbol(REhst, Value.SymbolName);
addRelocationForSymbol(REhr, Value.SymbolName);
addRelocationForSymbol(REh, Value.SymbolName);
addRelocationForSymbol(REl, Value.SymbolName);
} else {
addRelocationForSection(REhst, Value.SectionID);
addRelocationForSection(REhr, Value.SectionID);
addRelocationForSection(REh, Value.SectionID);
addRelocationForSection(REl, Value.SectionID);
}
resolveRelocation(Section, Offset, reinterpret_cast<uint64_t>(
Section.getAddressWithOffset(
Section.getStubOffset())),
RelType, 0);
Section.advanceStubOffset(getMaxStubSize());
}
if (SymType == SymbolRef::ST_Unknown) {
if (AbiVariant == 2)
writeInt32BE(Target + 4, 0xE8410018); else
writeInt32BE(Target + 4, 0xE8410028); }
}
} else if (RelType == ELF::R_PPC64_TOC16 ||
RelType == ELF::R_PPC64_TOC16_DS ||
RelType == ELF::R_PPC64_TOC16_LO ||
RelType == ELF::R_PPC64_TOC16_LO_DS ||
RelType == ELF::R_PPC64_TOC16_HI ||
RelType == ELF::R_PPC64_TOC16_HA) {
switch (RelType) {
case ELF::R_PPC64_TOC16: RelType = ELF::R_PPC64_ADDR16; break;
case ELF::R_PPC64_TOC16_DS: RelType = ELF::R_PPC64_ADDR16_DS; break;
case ELF::R_PPC64_TOC16_LO: RelType = ELF::R_PPC64_ADDR16_LO; break;
case ELF::R_PPC64_TOC16_LO_DS: RelType = ELF::R_PPC64_ADDR16_LO_DS; break;
case ELF::R_PPC64_TOC16_HI: RelType = ELF::R_PPC64_ADDR16_HI; break;
case ELF::R_PPC64_TOC16_HA: RelType = ELF::R_PPC64_ADDR16_HA; break;
default: llvm_unreachable("Wrong relocation type.");
}
RelocationValueRef TOCValue;
findPPC64TOCSection(Obj, ObjSectionToID, TOCValue);
if (Value.SymbolName || Value.SectionID != TOCValue.SectionID)
llvm_unreachable("Unsupported TOC relocation.");
Value.Addend -= TOCValue.Addend;
resolveRelocation(Sections[SectionID], Offset, Value.Addend, RelType, 0);
} else {
if (RelType == ELF::R_PPC64_TOC) {
RelType = ELF::R_PPC64_ADDR64;
findPPC64TOCSection(Obj, ObjSectionToID, Value);
} else if (TargetName == ".TOC.") {
findPPC64TOCSection(Obj, ObjSectionToID, Value);
Value.Addend += Addend;
}
RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
}
} else if (Arch == Triple::systemz &&
(RelType == ELF::R_390_PLT32DBL || RelType == ELF::R_390_GOTENT)) {
DEBUG(dbgs() << "\t\tThis is a SystemZ indirect relocation.");
SectionEntry &Section = Sections[SectionID];
StubMap::const_iterator i = Stubs.find(Value);
uintptr_t StubAddress;
if (i != Stubs.end()) {
StubAddress = uintptr_t(Section.getAddressWithOffset(i->second));
DEBUG(dbgs() << " Stub function found\n");
} else {
DEBUG(dbgs() << " Create a new stub function\n");
uintptr_t BaseAddress = uintptr_t(Section.getAddress());
uintptr_t StubAlignment = getStubAlignment();
StubAddress =
(BaseAddress + Section.getStubOffset() + StubAlignment - 1) &
-StubAlignment;
unsigned StubOffset = StubAddress - BaseAddress;
Stubs[Value] = StubOffset;
createStubFunction((uint8_t *)StubAddress);
RelocationEntry RE(SectionID, StubOffset + 8, ELF::R_390_64,
Value.Offset);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);
Section.advanceStubOffset(getMaxStubSize());
}
if (RelType == ELF::R_390_GOTENT)
resolveRelocation(Section, Offset, StubAddress + 8, ELF::R_390_PC32DBL,
Addend);
else
resolveRelocation(Section, Offset, StubAddress, RelType, Addend);
} else if (Arch == Triple::x86_64) {
if (RelType == ELF::R_X86_64_PLT32) {
if (Value.SymbolName) {
SectionEntry &Section = Sections[SectionID];
StubMap::const_iterator i = Stubs.find(Value);
uintptr_t StubAddress;
if (i != Stubs.end()) {
StubAddress = uintptr_t(Section.getAddress()) + i->second;
DEBUG(dbgs() << " Stub function found\n");
} else {
DEBUG(dbgs() << " Create a new stub function\n");
uintptr_t BaseAddress = uintptr_t(Section.getAddress());
uintptr_t StubAlignment = getStubAlignment();
StubAddress =
(BaseAddress + Section.getStubOffset() + StubAlignment - 1) &
-StubAlignment;
unsigned StubOffset = StubAddress - BaseAddress;
Stubs[Value] = StubOffset;
createStubFunction((uint8_t *)StubAddress);
Section.advanceStubOffset(getMaxStubSize());
uint64_t GOTOffset = allocateGOTEntries(SectionID, 1);
resolveGOTOffsetRelocation(SectionID, StubOffset + 2, GOTOffset - 4);
addRelocationForSymbol(
computeGOTOffsetRE(SectionID, GOTOffset, 0, ELF::R_X86_64_64),
Value.SymbolName);
}
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);
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 {
processSimpleRelocation(SectionID, Offset, RelType, Value);
}
} else {
if (Arch == Triple::x86) {
Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
}
processSimpleRelocation(SectionID, Offset, RelType, Value);
}
return ++RelI;
}
size_t RuntimeDyldELF::getGOTEntrySize() {
size_t Result = 0;
switch (Arch) {
case Triple::x86_64:
case Triple::aarch64:
case Triple::aarch64_be:
case Triple::ppc64:
case Triple::ppc64le:
case Triple::systemz:
Result = sizeof(uint64_t);
break;
case Triple::x86:
case Triple::arm:
case Triple::thumb:
Result = sizeof(uint32_t);
break;
case Triple::mips:
case Triple::mipsel:
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::allocateGOTEntries(unsigned SectionID, unsigned no)
{
(void)SectionID; if (GOTSectionID == 0) {
GOTSectionID = Sections.size();
Sections.push_back(SectionEntry(".got", nullptr, 0, 0, 0));
}
uint64_t StartOffset = CurrentGOTIndex * getGOTEntrySize();
CurrentGOTIndex += no;
return StartOffset;
}
void RuntimeDyldELF::resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset, uint64_t GOTOffset)
{
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; return RelocationEntry(GOTSectionID, GOTOffset, Type, SymbolOffset);
}
void RuntimeDyldELF::finalizeLoad(const ObjectFile &Obj,
ObjSectionToIDMap &SectionMap) {
if (IsMipsO32ABI)
if (!PendingRelocs.empty())
report_fatal_error("Can't find matching LO16 reloc");
if (GOTSectionID != 0) {
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, TotalSize, 0);
if (Checker)
Checker->registerSection(Obj.getFileName(), GOTSectionID);
memset(Addr, 0, TotalSize);
if (IsMipsN64ABI) {
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();
}
}
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") {
UnregisteredEHFrameSections.push_back(i->second);
break;
}
}
GOTSectionID = 0;
CurrentGOTIndex = 0;
}
bool RuntimeDyldELF::isCompatibleFile(const object::ObjectFile &Obj) const {
return Obj.isELF();
}
bool RuntimeDyldELF::relocationNeedsStub(const RelocationRef &R) const {
if (Arch != Triple::x86_64)
return true;
switch (R.getType()) {
default:
return true;
case ELF::R_X86_64_GOTPCREL:
case ELF::R_X86_64_PC32:
case ELF::R_X86_64_PC64:
case ELF::R_X86_64_64:
return false;
}
}
}