//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "dyld"
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/IntervalMap.h"
#include "RuntimeDyldELF.h"
+#include "JITRegistrar.h"
+#include "ObjectImageCommon.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/Object/ELFObjectFile.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/ELF.h"
-#include "llvm/ADT/Triple.h"
+#include "llvm/Support/MemoryBuffer.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;
+}
+
+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;
+
+ std::unique_ptr<ObjectFile> UnderlyingFile;
+
+public:
+ DyldELFObject(std::unique_ptr<ObjectFile> UnderlyingFile,
+ std::unique_ptr<MemoryBuffer> Wrapper, std::error_code &ec);
+
+ DyldELFObject(std::unique_ptr<MemoryBuffer> Wrapper, std::error_code &ec);
+
+ void updateSectionAddress(const SectionRef &Sec, uint64_t Addr);
+ void updateSymbolAddress(const SymbolRef &Sym, uint64_t Addr);
+
+ // Methods for type inquiry through isa, cast and dyn_cast
+ 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> 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 MemoryBuffer object but not the underlying memory.
+template <class ELFT>
+DyldELFObject<ELFT>::DyldELFObject(std::unique_ptr<MemoryBuffer> Wrapper,
+ std::error_code &EC)
+ : ELFObjectFile<ELFT>(std::move(Wrapper), EC) {
+ this->isDyldELFObject = true;
+}
+
+template <class ELFT>
+DyldELFObject<ELFT>::DyldELFObject(std::unique_ptr<ObjectFile> UnderlyingFile,
+ std::unique_ptr<MemoryBuffer> Wrapper,
+ std::error_code &EC)
+ : ELFObjectFile<ELFT>(std::move(Wrapper), EC),
+ UnderlyingFile(std::move(UnderlyingFile)) {
+ 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));
+
+ // This assumes the address passed in matches the target address bitness
+ // The template-based type cast handles everything else.
+ 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()));
+
+ // This assumes the address passed in matches the target address bitness
+ // The template-based type cast handles everything else.
+ sym->st_value = static_cast<addr_type>(Addr);
+}
+
+} // namespace
+
namespace llvm {
+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);
+ 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);
+ }
+ RegisteredEHFrameSections.clear();
+}
+
+ObjectImage *
+RuntimeDyldELF::createObjectImageFromFile(std::unique_ptr<object::ObjectFile> ObjFile) {
+ if (!ObjFile)
+ return nullptr;
+
+ std::error_code ec;
+ std::unique_ptr<MemoryBuffer> Buffer(
+ MemoryBuffer::getMemBuffer(ObjFile->getData(), "", false));
+
+ if (ObjFile->getBytesInAddress() == 4 && ObjFile->isLittleEndian()) {
+ auto Obj =
+ llvm::make_unique<DyldELFObject<ELFType<support::little, 2, false>>>(
+ std::move(ObjFile), std::move(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), std::move(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), std::move(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), std::move(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;
+
+ std::unique_ptr<MemoryBuffer> Buf = Buffer->getMemBuffer();
+
+ if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) {
+ auto Obj =
+ llvm::make_unique<DyldELFObject<ELFType<support::little, 4, false>>>(
+ std::move(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>>>(
+ std::move(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>>>(
+ std::move(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>>>(
+ std::move(Buf), ec);
+ return new ELFObjectImage<ELFType<support::little, 8, true>>(Buffer, std::move(Obj));
+ } else
+ llvm_unreachable("Unexpected ELF format");
+}
+
+RuntimeDyldELF::~RuntimeDyldELF() {}
-void RuntimeDyldELF::resolveX86_64Relocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- uint32_t Type,
- int64_t Addend) {
+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;
+ break;
case ELF::R_X86_64_64: {
- uint64_t *Target = (uint64_t*)(LocalAddress);
+ uint64_t *Target = reinterpret_cast<uint64_t *>(Section.Address + Offset);
*Target = Value + Addend;
+ DEBUG(dbgs() << "Writing " << format("%p", (Value + Addend)) << " at "
+ << format("%p\n", Target));
break;
}
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S: {
Value += Addend;
- // FIXME: Handle the possibility of this assertion failing
- assert((Type == ELF::R_X86_64_32 && !(Value & 0xFFFFFFFF00000000ULL)) ||
+ assert((Type == ELF::R_X86_64_32 && (Value <= UINT32_MAX)) ||
(Type == ELF::R_X86_64_32S &&
- (Value & 0xFFFFFFFF00000000ULL) == 0xFFFFFFFF00000000ULL));
+ ((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN)));
uint32_t TruncatedAddr = (Value & 0xFFFFFFFF);
- uint32_t *Target = reinterpret_cast<uint32_t*>(LocalAddress);
+ uint32_t *Target = reinterpret_cast<uint32_t *>(Section.Address + Offset);
*Target = 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;
break;
}
case ELF::R_X86_64_PC32: {
- uint32_t *Placeholder = reinterpret_cast<uint32_t*>(LocalAddress);
+ // 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 <= 214783647 && RealOffset >= -214783648);
+ assert(RealOffset <= INT32_MAX && RealOffset >= INT32_MIN);
int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
- *Placeholder = TruncOffset;
+ *Target = 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;
break;
}
}
}
-void RuntimeDyldELF::resolveX86Relocation(uint8_t *LocalAddress,
- uint32_t FinalAddress,
- uint32_t Value,
- uint32_t Type,
- int32_t Addend) {
+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: {
- uint32_t *Target = (uint32_t*)(LocalAddress);
- uint32_t Placeholder = *Target;
- *Target = Placeholder + Value + Addend;
+ // 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;
break;
}
case ELF::R_386_PC32: {
- uint32_t *Placeholder = reinterpret_cast<uint32_t*>(LocalAddress);
+ // 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;
- *Placeholder = RealOffset;
+ *Target = RealOffset;
+ break;
+ }
+ default:
+ // There are other relocation types, but it appears these are the
+ // only ones currently used by the LLVM ELF object writer
+ 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.Address + Offset);
+ uint64_t FinalAddress = Section.LoadAddress + Offset;
+
+ DEBUG(dbgs() << "resolveAArch64Relocation, LocalAddress: 0x"
+ << format("%llx", Section.Address + 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.Address + 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: // fallthrough
+ case ELF::R_AARCH64_JUMP26: {
+ // Operation: S+A-P. Set Call or B immediate value to bits fff_fffc of the
+ // calculation.
+ 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));
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xfc000000U;
+ // Immediate goes in bits 25:0 of B and BL.
+ *TargetPtr |= static_cast<uint32_t>(BranchImm & 0xffffffcU) >> 2;
+ break;
+ }
+ case ELF::R_AARCH64_MOVW_UABS_G3: {
+ uint64_t Result = Value + Addend;
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffe0001fU;
+ // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
+ *TargetPtr |= Result >> (48 - 5);
+ // Shift must be "lsl #48", in bits 22:21
+ assert((*TargetPtr >> 21 & 0x3) == 3 && "invalid shift for relocation");
+ break;
+ }
+ case ELF::R_AARCH64_MOVW_UABS_G2_NC: {
+ uint64_t Result = Value + Addend;
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffe0001fU;
+ // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
+ *TargetPtr |= ((Result & 0xffff00000000ULL) >> (32 - 5));
+ // Shift must be "lsl #32", in bits 22:21
+ assert((*TargetPtr >> 21 & 0x3) == 2 && "invalid shift for relocation");
+ break;
+ }
+ case ELF::R_AARCH64_MOVW_UABS_G1_NC: {
+ uint64_t Result = Value + Addend;
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffe0001fU;
+ // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
+ *TargetPtr |= ((Result & 0xffff0000U) >> (16 - 5));
+ // Shift must be "lsl #16", in bits 22:2
+ assert((*TargetPtr >> 21 & 0x3) == 1 && "invalid shift for relocation");
+ break;
+ }
+ case ELF::R_AARCH64_MOVW_UABS_G0_NC: {
+ uint64_t Result = Value + Addend;
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffe0001fU;
+ // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
+ *TargetPtr |= ((Result & 0xffffU) << 5);
+ // Shift must be "lsl #0", in bits 22:21.
+ assert((*TargetPtr >> 21 & 0x3) == 0 && "invalid shift for relocation");
+ break;
+ }
+ case ELF::R_AARCH64_ADR_PREL_PG_HI21: {
+ // Operation: Page(S+A) - Page(P)
+ uint64_t Result =
+ ((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");
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0x9f00001fU;
+ // Immediate goes in bits 30:29 + 5:23 of ADRP instruction, taken
+ // from bits 32:12 of X.
+ *TargetPtr |= ((Result & 0x3000U) << (29 - 12));
+ *TargetPtr |= ((Result & 0x1ffffc000ULL) >> (14 - 5));
+ break;
+ }
+ case ELF::R_AARCH64_LDST32_ABS_LO12_NC: {
+ // Operation: S + A
+ uint64_t Result = Value + Addend;
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffc003ffU;
+ // Immediate goes in bits 21:10 of LD/ST instruction, taken
+ // from bits 11:2 of X
+ *TargetPtr |= ((Result & 0xffc) << (10 - 2));
break;
- }
- default:
- // There are other relocation types, but it appears these are the
- // only ones currently used by the LLVM ELF object writer
- llvm_unreachable("Relocation type not implemented yet!");
- break;
+ }
+ case ELF::R_AARCH64_LDST64_ABS_LO12_NC: {
+ // Operation: S + A
+ uint64_t Result = Value + Addend;
+
+ // AArch64 code is emitted with .rela relocations. The data already in any
+ // bits affected by the relocation on entry is garbage.
+ *TargetPtr &= 0xffc003ffU;
+ // Immediate goes in bits 21:10 of LD/ST instruction, taken
+ // from bits 11:3 of X
+ *TargetPtr |= ((Result & 0xff8) << (10 - 3));
+ break;
+ }
}
}
-void RuntimeDyldELF::resolveARMRelocation(uint8_t *LocalAddress,
- uint32_t FinalAddress,
- uint32_t Value,
- uint32_t Type,
- int32_t Addend) {
+void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
+ uint64_t Offset, uint32_t Value,
+ uint32_t Type, int32_t Addend) {
// TODO: Add Thumb relocations.
- uint32_t* TargetPtr = (uint32_t*)LocalAddress;
+ 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;
- DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: " << LocalAddress
- << " FinalAddress: " << format("%p",FinalAddress)
- << " Value: " << format("%x",Value)
- << " Type: " << format("%x",Type)
- << " Addend: " << format("%x",Addend)
- << "\n");
+ DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: "
+ << Section.Address + Offset
+ << " FinalAddress: " << format("%p", FinalAddress) << " Value: "
+ << format("%x", Value) << " Type: " << format("%x", Type)
+ << " Addend: " << format("%x", Addend) << "\n");
- switch(Type) {
+ switch (Type) {
default:
llvm_unreachable("Not implemented relocation type!");
- // Just write 32bit value to relocation address
- case ELF::R_ARM_ABS32 :
- *TargetPtr = Value;
+ 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;
break;
-
// 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 :
+ 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 |= Value & 0xFFF;
+ *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 :
+ 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 |= Value & 0xFFF;
+ *TargetPtr = *Placeholder | (Value & 0xFFF);
*TargetPtr |= ((Value >> 12) & 0xF) << 16;
break;
-
// 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_PC24: // Fall through.
+ case ELF::R_ARM_CALL: // Fall through.
+ 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;
}
+ 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);
+ Value += Addend;
+
+ DEBUG(dbgs() << "resolveMipselocation, LocalAddress: "
+ << Section.Address + Offset << " FinalAddress: "
+ << format("%p", Section.LoadAddress + Offset) << " Value: "
+ << format("%x", Value) << " Type: " << format("%x", Type)
+ << " Addend: " << format("%x", Addend) << "\n");
+
+ switch (Type) {
+ default:
+ llvm_unreachable("Not implemented relocation type!");
+ break;
+ case ELF::R_MIPS_32:
+ *TargetPtr = Value + (*Placeholder);
+ break;
+ case ELF::R_MIPS_26:
+ *TargetPtr = ((*Placeholder) & 0xfc000000) | ((Value & 0x0fffffff) >> 2);
+ 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);
+ break;
+ case ELF::R_MIPS_LO16:
+ Value += ((*Placeholder) & 0x0000ffff);
+ *TargetPtr = ((*Placeholder) & 0xffff0000) | (Value & 0xffff);
+ 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);
+ break;
+ case ELF::R_MIPS_UNUSED2:
+ *TargetPtr = ((*TargetPtr) & 0xffff0000) | (Value & 0xffff);
+ break;
+ }
+}
+
+// Return the .TOC. section and offset.
+void RuntimeDyldELF::findPPC64TOCSection(ObjectImage &Obj,
+ ObjSectionToIDMap &LocalSections,
+ RelocationValueRef &Rel) {
+ // Set a default SectionID in case we do not find a TOC section below.
+ // This may happen for references to TOC base base (sym@toc, .odp
+ // 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.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) {
+
+ StringRef SectionName;
+ check(si->getName(SectionName));
+
+ if (SectionName == ".got"
+ || SectionName == ".toc"
+ || SectionName == ".tocbss"
+ || SectionName == ".plt") {
+ Rel.SectionID = findOrEmitSection(Obj, *si, false, LocalSections);
+ break;
+ }
+ }
+
+ // Per the ppc64-elf-linux ABI, The TOC base is TOC value plus 0x8000
+ // thus permitting a full 64 Kbytes segment.
+ Rel.Addend = 0x8000;
+}
+
+// Returns the sections and offset associated with the ODP entry referenced
+// by Symbol.
+void RuntimeDyldELF::findOPDEntrySection(ObjectImage &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();
+ si != se; ++si) {
+ section_iterator RelSecI = si->getRelocatedSection();
+ if (RelSecI == Obj.end_sections())
+ continue;
+
+ StringRef RelSectionName;
+ check(RelSecI->getName(RelSectionName));
+ if (RelSectionName != ".opd")
+ continue;
+
+ for (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));
+ if (TypeFunc != ELF::R_PPC64_ADDR64) {
+ ++i;
+ continue;
+ }
+
+ uint64_t TargetSymbolOffset;
+ symbol_iterator TargetSymbol = i->getSymbol();
+ check(i->getOffset(TargetSymbolOffset));
+ int64_t Addend;
+ check(getELFRelocationAddend(*i, Addend));
+
+ ++i;
+ if (i == e)
+ break;
+
+ // Just check if following relocation is a R_PPC64_TOC
+ uint64_t TypeTOC;
+ check(i->getType(TypeTOC));
+ if (TypeTOC != ELF::R_PPC64_TOC)
+ continue;
+
+ // Finally compares the Symbol value and the target symbol offset
+ // to check if this .opd entry refers to the symbol the relocation
+ // points to.
+ if (Rel.Addend != (int64_t)TargetSymbolOffset)
+ continue;
+
+ section_iterator tsi(Obj.end_sections());
+ check(TargetSymbol->getSection(tsi));
+ bool IsCode = false;
+ tsi->isText(IsCode);
+ Rel.SectionID = findOrEmitSection(Obj, (*tsi), IsCode, LocalSections);
+ Rel.Addend = (intptr_t)Addend;
+ return;
+ }
+ }
+ llvm_unreachable("Attempting to get address of ODP entry!");
+}
+
+// Relocation masks following the #lo(value), #hi(value), #ha(value),
+// #higher(value), #highera(value), #highest(value), and #highesta(value)
+// macros defined in section 4.5.1. Relocation Types of the PPC-elf64abi
+// document.
+
+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::resolvePPC64Relocation(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_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);
+ // Preserve the AA/LK bits in the branch instruction
+ uint8_t aalk = *(LocalAddress + 3);
+ writeInt16BE(LocalAddress + 2, (aalk & 3) | ((Value + Addend) & 0xfffc));
+ } break;
+ case ELF::R_PPC64_REL16_LO: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ uint64_t Delta = Value - FinalAddress + Addend;
+ writeInt16BE(LocalAddress, applyPPClo(Delta));
+ } break;
+ case ELF::R_PPC64_REL16_HI: {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
+ uint64_t Delta = Value - FinalAddress + Addend;
+ writeInt16BE(LocalAddress, applyPPChi(Delta));
+ } break;
+ case ELF::R_PPC64_REL16_HA: {
+ uint64_t FinalAddress = (Section.LoadAddress + 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.LoadAddress + Offset);
+ int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
+ if (SignExtend32<24>(delta) != delta)
+ llvm_unreachable("Relocation R_PPC64_REL24 overflow");
+ // Generates a 'bl <address>' instruction
+ writeInt32BE(LocalAddress, 0x48000001 | (delta & 0x03FFFFFC));
+ } break;
+ case ELF::R_PPC64_REL32: {
+ uint64_t FinalAddress = (Section.LoadAddress + 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.LoadAddress + Offset);
+ uint64_t Delta = Value - FinalAddress + Addend;
+ writeInt64BE(LocalAddress, Delta);
+ } break;
+ case ELF::R_PPC64_ADDR64:
+ writeInt64BE(LocalAddress, Value + Addend);
+ break;
+ }
}
-void RuntimeDyldELF::resolveRelocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- uint32_t Type,
- int64_t Addend) {
+void RuntimeDyldELF::resolveSystemZRelocation(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_390_PC16DBL:
+ case ELF::R_390_PLT16DBL: {
+ int64_t Delta = (Value + Addend) - (Section.LoadAddress + 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.LoadAddress + 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.LoadAddress + Offset);
+ assert(int32_t(Delta) == Delta && "R_390_PC32 overflow");
+ writeInt32BE(LocalAddress, Delta);
+ break;
+ }
+ case ELF::R_390_64:
+ writeInt64BE(LocalAddress, Value + Addend);
+ break;
+ }
+}
+
+// The target location for the relocation is described by RE.SectionID and
+// RE.Offset. RE.SectionID can be used to find the SectionEntry. Each
+// SectionEntry has three members describing its location.
+// SectionEntry::Address is the address at which the section has been loaded
+// into memory in the current (host) process. SectionEntry::LoadAddress is the
+// address that the section will have in the target process.
+// SectionEntry::ObjAddress is the address of the bits for this section in the
+// original emitted object image (also in the current address space).
+//
+// Relocations will be applied as if the section were loaded at
+// SectionEntry::LoadAddress, but they will be applied at an address based
+// on SectionEntry::Address. SectionEntry::ObjAddress will be used to refer to
+// Target memory contents if they are required for value calculations.
+//
+// The Value parameter here is the load address of the symbol for the
+// relocation to be applied. For relocations which refer to symbols in the
+// current object Value will be the LoadAddress of the section in which
+// the symbol resides (RE.Addend provides additional information about the
+// symbol location). For external symbols, Value will be the address of the
+// symbol in the target address space.
+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);
+}
+
+void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section,
+ uint64_t Offset, uint64_t Value,
+ uint32_t Type, int64_t Addend,
+ uint64_t SymOffset) {
switch (Arch) {
case Triple::x86_64:
- resolveX86_64Relocation(LocalAddress, FinalAddress, Value, Type, Addend);
+ resolveX86_64Relocation(Section, Offset, Value, Type, Addend, SymOffset);
break;
case Triple::x86:
- resolveX86Relocation(LocalAddress, (uint32_t)(FinalAddress & 0xffffffffL),
- (uint32_t)(Value & 0xffffffffL), Type,
+ resolveX86Relocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
- case Triple::arm: // Fall through.
+ case Triple::aarch64:
+ case Triple::aarch64_be:
+ resolveAArch64Relocation(Section, Offset, Value, Type, Addend);
+ break;
+ case Triple::arm: // Fall through.
+ case Triple::armeb:
case Triple::thumb:
- resolveARMRelocation(LocalAddress, (uint32_t)(FinalAddress & 0xffffffffL),
- (uint32_t)(Value & 0xffffffffL), Type,
+ case Triple::thumbeb:
+ resolveARMRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
- default: llvm_unreachable("Unsupported CPU type!");
+ case Triple::mips: // Fall through.
+ case Triple::mipsel:
+ resolveMIPSRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL),
+ Type, (uint32_t)(Addend & 0xffffffffL));
+ break;
+ case Triple::ppc64: // Fall through.
+ 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::processRelocationRef(const ObjRelocationInfo &Rel,
- const ObjectFile &Obj,
- ObjSectionToIDMap &ObjSectionToID,
- LocalSymbolMap &Symbols,
- StubMap &Stubs) {
+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();
- uint32_t RelType = (uint32_t)(Rel.Type & 0xffffffffL);
- intptr_t Addend = (intptr_t)Rel.AdditionalInfo;
- RelocationValueRef Value;
+ // Obtain the symbol name which is referenced in the relocation
StringRef TargetName;
- const SymbolRef &Symbol = Rel.Symbol;
- Symbol.getName(TargetName);
- DEBUG(dbgs() << "\t\tRelType: " << RelType
- << " Addend: " << Addend
- << " TargetName: " << TargetName
- << "\n");
- // First look the symbol in object file symbols.
- LocalSymbolMap::iterator lsi = Symbols.find(TargetName.data());
+ if (Symbol != Obj.end_symbols())
+ Symbol->getName(TargetName);
+ 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.Addend = lsi->second.second;
+ Value.Offset = lsi->second.second;
+ Value.Addend = lsi->second.second + Addend;
} else {
- // Second look the symbol in global symbol table.
- StringMap<SymbolLoc>::iterator gsi = SymbolTable.find(TargetName.data());
- if (gsi != SymbolTable.end()) {
+ // 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.Addend = gsi->second.second;
+ Value.Offset = gsi->second.second;
+ Value.Addend = gsi->second.second + Addend;
} else {
- SymbolRef::Type SymType;
- Symbol.getType(SymType);
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");
- Value.SectionID = findOrEmitSection((*si), true, ObjSectionToID);
- Value.Addend = Addend;
- break;
- }
- case SymbolRef::ST_Unknown: {
- Value.SymbolName = TargetName.data();
- Value.Addend = Addend;
- break;
- }
- default:
- llvm_unreachable("Unresolved symbol type!");
- break;
+ 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;
}
}
}
- DEBUG(dbgs() << "\t\tRel.SectionID: " << Rel.SectionID
- << " Rel.Offset: " << Rel.Offset
+ uint64_t Offset;
+ Check(RelI->getOffset(Offset));
+
+ DEBUG(dbgs() << "\t\tSectionID: " << SectionID << " Offset: " << Offset
<< "\n");
- if (Arch == Triple::arm &&
- (RelType == ELF::R_ARM_PC24 ||
- RelType == ELF::R_ARM_CALL ||
- RelType == ELF::R_ARM_JUMP24)) {
+ if ((Arch == Triple::aarch64 || Arch == Triple::aarch64_be) &&
+ (RelType == ELF::R_AARCH64_CALL26 || RelType == ELF::R_AARCH64_JUMP26)) {
+ // This is an AArch64 branch relocation, need to use a stub function.
+ DEBUG(dbgs() << "\t\tThis is an AArch64 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 =
+ createStubFunction(Section.Address + Section.StubOffset);
+
+ RelocationEntry REmovz_g3(SectionID, StubTargetAddr - Section.Address,
+ ELF::R_AARCH64_MOVW_UABS_G3, Value.Addend);
+ RelocationEntry REmovk_g2(SectionID, StubTargetAddr - Section.Address + 4,
+ ELF::R_AARCH64_MOVW_UABS_G2_NC, Value.Addend);
+ RelocationEntry REmovk_g1(SectionID, StubTargetAddr - Section.Address + 8,
+ ELF::R_AARCH64_MOVW_UABS_G1_NC, Value.Addend);
+ RelocationEntry REmovk_g0(SectionID,
+ StubTargetAddr - Section.Address + 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,
+ (uint64_t)Section.Address + Section.StubOffset, RelType,
+ 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[Rel.SectionID];
- uint8_t *Target = Section.Address + Rel.Offset;
+ 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 =
+ 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();
+ }
+ } 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;
+
+ // Extract the addend from the instruction.
+ uint32_t Addend = ((*TargetAddress) & 0x03ffffff) << 2;
+
+ Value.Addend += Addend;
// Look up for existing stub.
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end()) {
- resolveRelocation(Target, Section.LoadAddress, (uint64_t)Section.Address +
- i->second, RelType, 0);
+ 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);
- AddRelocation(Value, Rel.SectionID,
- StubTargetAddr - Section.Address, ELF::R_ARM_ABS32);
- resolveRelocation(Target, Section.LoadAddress, (uint64_t)Section.Address +
- Section.StubOffset, RelType, 0);
+ 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);
+
+ 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();
}
- } else
- AddRelocation(Value, Rel.SectionID, Rel.Offset, RelType);
+ } 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);
+ 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
+ // is not within the signed 24-bits branch address.
+ SectionEntry &Section = Sections[SectionID];
+ uint8_t *Target = Section.Address + Offset;
+ bool RangeOverflow = false;
+ if (SymType != SymbolRef::ST_Unknown) {
+ if (AbiVariant != 2) {
+ // In the ELFv1 ABI, a function call may point to the .opd entry,
+ // so the final symbol value is calculated based on the relocation
+ // values in the .opd section.
+ findOPDEntrySection(Obj, ObjSectionToID, Value);
+ } 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);
+ Value.Addend += ELF::decodePPC64LocalEntryOffset(SymOther);
+ }
+ uint8_t *RelocTarget = Sections[Value.SectionID].Address + Value.Addend;
+ int32_t delta = static_cast<int32_t>(Target - RelocTarget);
+ // If it is within 24-bits branch range, just set the branch target
+ if (SignExtend32<24>(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 == true) {
+ // It is an external symbol (SymbolRef::ST_Unknown) or within a range
+ // larger than 24-bits.
+ StubMap::const_iterator i = Stubs.find(Value);
+ if (i != Stubs.end()) {
+ // Symbol function stub already created, just relocate to it
+ 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,
+ AbiVariant);
+ RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
+ ELF::R_PPC64_ADDR64, Value.Addend);
+
+ // Generates the 64-bits address loads as exemplified in section
+ // 4.5.1 in PPC64 ELF ABI. Note that the relocations need to
+ // apply to the low part of the instructions, so we have to update
+ // the offset according to the target endianness.
+ uint64_t StubRelocOffset = StubTargetAddr - Section.Address;
+ 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,
+ (uint64_t)Section.Address + Section.StubOffset,
+ RelType, 0);
+ Section.StubOffset += getMaxStubSize();
+ }
+ if (SymType == SymbolRef::ST_Unknown) {
+ // Restore the TOC for external calls
+ if (AbiVariant == 2)
+ writeInt32BE(Target + 4, 0xE8410018); // ld r2,28(r1)
+ else
+ writeInt32BE(Target + 4, 0xE8410028); // ld r2,40(r1)
+ }
+ }
+ } 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) {
+ // 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
+ // 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
+ // that the two sections are actually the same. Thus they cancel out
+ // and we can immediately resolve the relocation right now.
+ 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 {
+ // There are two ways to refer to the TOC address directly: either
+ // via a ELF::R_PPC64_TOC relocation (where both symbol and addend are
+ // ignored), or via any relocation that refers to the magic ".TOC."
+ // symbols (in which case the addend is respected).
+ 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)) {
+ // Create function stubs for both PLT and GOT references, regardless of
+ // whether the GOT reference is to data or code. The stub contains the
+ // full address of the symbol, as needed by GOT references, and the
+ // executable part only adds an overhead of 8 bytes.
+ //
+ // We could try to conserve space by allocating the code and data
+ // parts of the stub separately. However, as things stand, we allocate
+ // a stub for every relocation, so using a GOT in JIT code should be
+ // no less space efficient than using an explicit constant pool.
+ DEBUG(dbgs() << "\t\tThis is a SystemZ indirect relocation.");
+ SectionEntry &Section = Sections[SectionID];
+
+ // Look for an existing stub.
+ 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 {
+ // Create a new stub function.
+ 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;
+ unsigned StubOffset = StubAddress - BaseAddress;
+
+ Stubs[Value] = StubOffset;
+ createStubFunction((uint8_t *)StubAddress);
+ RelocationEntry RE(SectionID, StubOffset + 8, ELF::R_390_64,
+ Value.Addend - Addend);
+ if (Value.SymbolName)
+ addRelocationForSymbol(RE, Value.SymbolName);
+ else
+ addRelocationForSection(RE, Value.SectionID);
+ Section.StubOffset = StubOffset + 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 && 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 {
+ // 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;
+ 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();
+ }
+
+ // 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 (Arch == Triple::x86_64 && RelType == ELF::R_X86_64_GOTPCREL) {
+ GOTEntries.push_back(Value);
+ }
+ RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, Value.Offset);
+ if (Value.SymbolName)
+ addRelocationForSymbol(RE, Value.SymbolName);
+ else
+ addRelocationForSection(RE, Value.SectionID);
+ }
+ 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.
+ 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:
+ case Triple::mips:
+ case Triple::mipsel:
+ Result = sizeof(uint32_t);
+ 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);
+ }
+ }
+
+ assert(GOTIndex != -1 && "Unable to find requested GOT entry.");
+ return 0;
+}
+
+void RuntimeDyldELF::finalizeLoad(ObjectImage &ObjImg,
+ ObjSectionToIDMap &SectionMap) {
+ // 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);
+ }
+ } else {
+ report_fatal_error("Unable to allocate memory for GOT!");
+ }
+
+ // Look for and record the EH frame section.
+ 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;
+ }
+ }
}
-bool RuntimeDyldELF::isCompatibleFormat(const MemoryBuffer *InputBuffer) const {
- StringRef Magic = InputBuffer->getBuffer().slice(0, ELF::EI_NIDENT);
- return (memcmp(Magic.data(), ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0;
+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;
}
+
+bool RuntimeDyldELF::isCompatibleFile(const object::ObjectFile *Obj) const {
+ return Obj->isELF();
+}
+
} // namespace llvm