//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "dyld"
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/STLExtras.h"
#include "RuntimeDyldMachO.h"
+#include "Targets/RuntimeDyldMachOAArch64.h"
+#include "Targets/RuntimeDyldMachOARM.h"
+#include "Targets/RuntimeDyldMachOI386.h"
+#include "Targets/RuntimeDyldMachOX86_64.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+
using namespace llvm;
using namespace llvm::object;
-namespace llvm {
+#define DEBUG_TYPE "dyld"
-void RuntimeDyldMachO::resolveRelocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- uint32_t Type,
- int64_t Addend) {
- bool isPCRel = (Type >> 24) & 1;
- unsigned MachoType = (Type >> 28) & 0xf;
- unsigned Size = 1 << ((Type >> 25) & 3);
-
- DEBUG(dbgs() << "resolveRelocation LocalAddress: "
- << format("%p", LocalAddress)
- << " FinalAddress: " << format("%p", FinalAddress)
- << " Value: " << format("%p", Value)
- << " Addend: " << Addend
- << " isPCRel: " << isPCRel
- << " MachoType: " << MachoType
- << " Size: " << Size
- << "\n");
-
- // This just dispatches to the proper target specific routine.
- switch (Arch) {
- default: llvm_unreachable("Unsupported CPU type!");
- case Triple::x86_64:
- resolveX86_64Relocation(LocalAddress,
- FinalAddress,
- (uintptr_t)Value,
- isPCRel,
- MachoType,
- Size,
- Addend);
- break;
- case Triple::x86:
- resolveI386Relocation(LocalAddress,
- FinalAddress,
- (uintptr_t)Value,
- isPCRel,
- Type,
- Size,
- Addend);
- break;
- case Triple::arm: // Fall through.
- case Triple::thumb:
- resolveARMRelocation(LocalAddress,
- FinalAddress,
- (uintptr_t)Value,
- isPCRel,
- MachoType,
- Size,
- Addend);
- break;
+namespace {
+
+class LoadedMachOObjectInfo
+ : public RuntimeDyld::LoadedObjectInfoHelper<LoadedMachOObjectInfo> {
+public:
+ LoadedMachOObjectInfo(RuntimeDyldImpl &RTDyld, unsigned BeginIdx,
+ unsigned EndIdx)
+ : LoadedObjectInfoHelper(RTDyld, BeginIdx, EndIdx) {}
+
+ OwningBinary<ObjectFile>
+ getObjectForDebug(const ObjectFile &Obj) const override {
+ return OwningBinary<ObjectFile>();
}
+};
+
}
-bool RuntimeDyldMachO::resolveI386Relocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- bool isPCRel,
- unsigned Type,
- unsigned Size,
- int64_t Addend) {
- if (isPCRel)
- Value -= FinalAddress + 4; // see resolveX86_64Relocation
-
- switch (Type) {
- default:
- llvm_unreachable("Invalid relocation type!");
- case macho::RIT_Vanilla: {
- uint8_t *p = LocalAddress;
- uint64_t ValueToWrite = Value + Addend;
- for (unsigned i = 0; i < Size; ++i) {
- *p++ = (uint8_t)(ValueToWrite & 0xff);
- ValueToWrite >>= 8;
+namespace llvm {
+
+int64_t RuntimeDyldMachO::memcpyAddend(const RelocationEntry &RE) const {
+ unsigned NumBytes = 1 << RE.Size;
+ uint8_t *Src = Sections[RE.SectionID].Address + RE.Offset;
+
+ return static_cast<int64_t>(readBytesUnaligned(Src, NumBytes));
+}
+
+RelocationValueRef RuntimeDyldMachO::getRelocationValueRef(
+ const ObjectFile &BaseTObj, const relocation_iterator &RI,
+ const RelocationEntry &RE, ObjSectionToIDMap &ObjSectionToID) {
+
+ const MachOObjectFile &Obj =
+ static_cast<const MachOObjectFile &>(BaseTObj);
+ MachO::any_relocation_info RelInfo =
+ Obj.getRelocation(RI->getRawDataRefImpl());
+ RelocationValueRef Value;
+
+ bool IsExternal = Obj.getPlainRelocationExternal(RelInfo);
+ if (IsExternal) {
+ symbol_iterator Symbol = RI->getSymbol();
+ StringRef TargetName;
+ Symbol->getName(TargetName);
+ RTDyldSymbolTable::const_iterator SI =
+ GlobalSymbolTable.find(TargetName.data());
+ if (SI != GlobalSymbolTable.end()) {
+ const auto &SymInfo = SI->second;
+ Value.SectionID = SymInfo.getSectionID();
+ Value.Offset = SymInfo.getOffset() + RE.Addend;
+ } else {
+ Value.SymbolName = TargetName.data();
+ Value.Offset = RE.Addend;
}
+ } else {
+ SectionRef Sec = Obj.getAnyRelocationSection(RelInfo);
+ bool IsCode = Sec.isText();
+ Value.SectionID = findOrEmitSection(Obj, Sec, IsCode, ObjSectionToID);
+ uint64_t Addr = Sec.getAddress();
+ Value.Offset = RE.Addend - Addr;
}
- case macho::RIT_Difference:
- case macho::RIT_Generic_LocalDifference:
- case macho::RIT_Generic_PreboundLazyPointer:
- return Error("Relocation type not implemented yet!");
- }
+
+ return Value;
}
-bool RuntimeDyldMachO::resolveX86_64Relocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- bool isPCRel,
- unsigned Type,
- unsigned Size,
- int64_t Addend) {
- // If the relocation is PC-relative, the value to be encoded is the
- // pointer difference.
- if (isPCRel)
- // FIXME: It seems this value needs to be adjusted by 4 for an effective PC
- // address. Is that expected? Only for branches, perhaps?
- Value -= FinalAddress + 4;
-
- switch(Type) {
- default:
- llvm_unreachable("Invalid relocation type!");
- case macho::RIT_X86_64_Signed1:
- case macho::RIT_X86_64_Signed2:
- case macho::RIT_X86_64_Signed4:
- case macho::RIT_X86_64_Signed:
- case macho::RIT_X86_64_Unsigned:
- case macho::RIT_X86_64_Branch: {
- Value += Addend;
- // Mask in the target value a byte at a time (we don't have an alignment
- // guarantee for the target address, so this is safest).
- uint8_t *p = (uint8_t*)LocalAddress;
- for (unsigned i = 0; i < Size; ++i) {
- *p++ = (uint8_t)Value;
- Value >>= 8;
- }
- return false;
+void RuntimeDyldMachO::makeValueAddendPCRel(RelocationValueRef &Value,
+ const ObjectFile &BaseTObj,
+ const relocation_iterator &RI,
+ unsigned OffsetToNextPC) {
+ const MachOObjectFile &Obj =
+ static_cast<const MachOObjectFile &>(BaseTObj);
+ MachO::any_relocation_info RelInfo =
+ Obj.getRelocation(RI->getRawDataRefImpl());
+
+ bool IsPCRel = Obj.getAnyRelocationPCRel(RelInfo);
+ if (IsPCRel) {
+ uint64_t RelocAddr = 0;
+ RI->getAddress(RelocAddr);
+ Value.Offset += RelocAddr + OffsetToNextPC;
}
- case macho::RIT_X86_64_GOTLoad:
- case macho::RIT_X86_64_GOT:
- case macho::RIT_X86_64_Subtractor:
- case macho::RIT_X86_64_TLV:
- return Error("Relocation type not implemented yet!");
+}
+
+void RuntimeDyldMachO::dumpRelocationToResolve(const RelocationEntry &RE,
+ uint64_t Value) const {
+ const SectionEntry &Section = Sections[RE.SectionID];
+ uint8_t *LocalAddress = Section.Address + RE.Offset;
+ uint64_t FinalAddress = Section.LoadAddress + RE.Offset;
+
+ dbgs() << "resolveRelocation Section: " << RE.SectionID
+ << " LocalAddress: " << format("%p", LocalAddress)
+ << " FinalAddress: " << format("0x%016" PRIx64, FinalAddress)
+ << " Value: " << format("0x%016" PRIx64, Value) << " Addend: " << RE.Addend
+ << " isPCRel: " << RE.IsPCRel << " MachoType: " << RE.RelType
+ << " Size: " << (1 << RE.Size) << "\n";
+}
+
+section_iterator
+RuntimeDyldMachO::getSectionByAddress(const MachOObjectFile &Obj,
+ uint64_t Addr) {
+ section_iterator SI = Obj.section_begin();
+ section_iterator SE = Obj.section_end();
+
+ for (; SI != SE; ++SI) {
+ uint64_t SAddr = SI->getAddress();
+ uint64_t SSize = SI->getSize();
+ if ((Addr >= SAddr) && (Addr < SAddr + SSize))
+ return SI;
}
+
+ return SE;
}
-bool RuntimeDyldMachO::resolveARMRelocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- bool isPCRel,
- unsigned Type,
- unsigned Size,
- int64_t Addend) {
- // If the relocation is PC-relative, the value to be encoded is the
- // pointer difference.
- if (isPCRel) {
- Value -= FinalAddress;
- // ARM PCRel relocations have an effective-PC offset of two instructions
- // (four bytes in Thumb mode, 8 bytes in ARM mode).
- // FIXME: For now, assume ARM mode.
- Value -= 8;
+
+// Populate __pointers section.
+void RuntimeDyldMachO::populateIndirectSymbolPointersSection(
+ const MachOObjectFile &Obj,
+ const SectionRef &PTSection,
+ unsigned PTSectionID) {
+ assert(!Obj.is64Bit() &&
+ "Pointer table section not supported in 64-bit MachO.");
+
+ MachO::dysymtab_command DySymTabCmd = Obj.getDysymtabLoadCommand();
+ MachO::section Sec32 = Obj.getSection(PTSection.getRawDataRefImpl());
+ uint32_t PTSectionSize = Sec32.size;
+ unsigned FirstIndirectSymbol = Sec32.reserved1;
+ const unsigned PTEntrySize = 4;
+ unsigned NumPTEntries = PTSectionSize / PTEntrySize;
+ unsigned PTEntryOffset = 0;
+
+ assert((PTSectionSize % PTEntrySize) == 0 &&
+ "Pointers section does not contain a whole number of stubs?");
+
+ DEBUG(dbgs() << "Populating pointer table section "
+ << Sections[PTSectionID].Name
+ << ", Section ID " << PTSectionID << ", "
+ << NumPTEntries << " entries, " << PTEntrySize
+ << " bytes each:\n");
+
+ for (unsigned i = 0; i < NumPTEntries; ++i) {
+ unsigned SymbolIndex =
+ Obj.getIndirectSymbolTableEntry(DySymTabCmd, FirstIndirectSymbol + i);
+ symbol_iterator SI = Obj.getSymbolByIndex(SymbolIndex);
+ StringRef IndirectSymbolName;
+ SI->getName(IndirectSymbolName);
+ DEBUG(dbgs() << " " << IndirectSymbolName << ": index " << SymbolIndex
+ << ", PT offset: " << PTEntryOffset << "\n");
+ RelocationEntry RE(PTSectionID, PTEntryOffset,
+ MachO::GENERIC_RELOC_VANILLA, 0, false, 2);
+ addRelocationForSymbol(RE, IndirectSymbolName);
+ PTEntryOffset += PTEntrySize;
}
+}
- switch(Type) {
- default:
- llvm_unreachable("Invalid relocation type!");
- case macho::RIT_Vanilla: {
- // Mask in the target value a byte at a time (we don't have an alignment
- // guarantee for the target address, so this is safest).
- uint8_t *p = (uint8_t*)LocalAddress;
- for (unsigned i = 0; i < Size; ++i) {
- *p++ = (uint8_t)Value;
- Value >>= 8;
+bool RuntimeDyldMachO::isCompatibleFile(const object::ObjectFile &Obj) const {
+ return Obj.isMachO();
+}
+
+template <typename Impl>
+void RuntimeDyldMachOCRTPBase<Impl>::finalizeLoad(const ObjectFile &Obj,
+ ObjSectionToIDMap &SectionMap) {
+ unsigned EHFrameSID = RTDYLD_INVALID_SECTION_ID;
+ unsigned TextSID = RTDYLD_INVALID_SECTION_ID;
+ unsigned ExceptTabSID = RTDYLD_INVALID_SECTION_ID;
+
+ for (const auto &Section : Obj.sections()) {
+ StringRef Name;
+ Section.getName(Name);
+
+ // Force emission of the __text, __eh_frame, and __gcc_except_tab sections
+ // if they're present. Otherwise call down to the impl to handle other
+ // sections that have already been emitted.
+ if (Name == "__text")
+ TextSID = findOrEmitSection(Obj, Section, true, SectionMap);
+ else if (Name == "__eh_frame")
+ EHFrameSID = findOrEmitSection(Obj, Section, false, SectionMap);
+ else if (Name == "__gcc_except_tab")
+ ExceptTabSID = findOrEmitSection(Obj, Section, true, SectionMap);
+ else {
+ auto I = SectionMap.find(Section);
+ if (I != SectionMap.end())
+ impl().finalizeSection(Obj, I->second, Section);
}
- break;
- }
- case macho::RIT_ARM_Branch24Bit: {
- // Mask the value into the target address. We know instructions are
- // 32-bit aligned, so we can do it all at once.
- uint32_t *p = (uint32_t*)LocalAddress;
- // The low two bits of the value are not encoded.
- Value >>= 2;
- // Mask the value to 24 bits.
- Value &= 0xffffff;
- // FIXME: If the destination is a Thumb function (and the instruction
- // is a non-predicated BL instruction), we need to change it to a BLX
- // instruction instead.
-
- // Insert the value into the instruction.
- *p = (*p & ~0xffffff) | Value;
- break;
}
- case macho::RIT_ARM_ThumbBranch22Bit:
- case macho::RIT_ARM_ThumbBranch32Bit:
- case macho::RIT_ARM_Half:
- case macho::RIT_ARM_HalfDifference:
- case macho::RIT_Pair:
- case macho::RIT_Difference:
- case macho::RIT_ARM_LocalDifference:
- case macho::RIT_ARM_PreboundLazyPointer:
- return Error("Relocation type not implemented yet!");
- }
- return false;
+ UnregisteredEHFrameSections.push_back(
+ EHFrameRelatedSections(EHFrameSID, TextSID, ExceptTabSID));
}
-void RuntimeDyldMachO::processRelocationRef(const ObjRelocationInfo &Rel,
- ObjectImage &Obj,
- ObjSectionToIDMap &ObjSectionToID,
- const SymbolTableMap &Symbols,
- StubMap &Stubs) {
+template <typename Impl>
+unsigned char *RuntimeDyldMachOCRTPBase<Impl>::processFDE(unsigned char *P,
+ int64_t DeltaForText,
+ int64_t DeltaForEH) {
+ typedef typename Impl::TargetPtrT TargetPtrT;
- uint32_t RelType = (uint32_t) (Rel.Type & 0xffffffffL);
- RelocationValueRef Value;
- SectionEntry &Section = Sections[Rel.SectionID];
- uint8_t *Target = Section.Address + Rel.Offset;
+ DEBUG(dbgs() << "Processing FDE: Delta for text: " << DeltaForText
+ << ", Delta for EH: " << DeltaForEH << "\n");
+ uint32_t Length = readBytesUnaligned(P, 4);
+ P += 4;
+ unsigned char *Ret = P + Length;
+ uint32_t Offset = readBytesUnaligned(P, 4);
+ if (Offset == 0) // is a CIE
+ return Ret;
- bool isExtern = (RelType >> 27) & 1;
- if (isExtern) {
- StringRef TargetName;
- const SymbolRef &Symbol = Rel.Symbol;
- Symbol.getName(TargetName);
- // First look the symbol in object file symbols.
- SymbolTableMap::const_iterator lsi = Symbols.find(TargetName.data());
- if (lsi != Symbols.end()) {
- Value.SectionID = lsi->second.first;
- Value.Addend = lsi->second.second;
- } else {
- // Second look the symbol in global symbol table.
- SymbolTableMap::const_iterator gsi = GlobalSymbolTable.find(TargetName.data());
- if (gsi != GlobalSymbolTable.end()) {
- Value.SectionID = gsi->second.first;
- Value.Addend = gsi->second.second;
- } else
- Value.SymbolName = TargetName.data();
- }
- } else {
- error_code err;
- uint8_t sectionIndex = static_cast<uint8_t>(RelType & 0xFF);
- section_iterator si = Obj.begin_sections(),
- se = Obj.end_sections();
- for (uint8_t i = 1; i < sectionIndex; i++) {
- error_code err;
- si.increment(err);
- if (si == se)
- break;
- }
- assert(si != se && "No section containing relocation!");
- Value.SectionID = findOrEmitSection(Obj, *si, true, ObjSectionToID);
- Value.Addend = *(const intptr_t *)Target;
- if (Value.Addend) {
- // The MachO addend is offset from the current section, we need set it
- // as offset from destination section
- Value.Addend += Section.ObjAddress - Sections[Value.SectionID].ObjAddress;
- }
+ P += 4;
+ TargetPtrT FDELocation = readBytesUnaligned(P, sizeof(TargetPtrT));
+ TargetPtrT NewLocation = FDELocation - DeltaForText;
+ writeBytesUnaligned(NewLocation, P, sizeof(TargetPtrT));
+
+ P += sizeof(TargetPtrT);
+
+ // Skip the FDE address range
+ P += sizeof(TargetPtrT);
+
+ uint8_t Augmentationsize = *P;
+ P += 1;
+ if (Augmentationsize != 0) {
+ TargetPtrT LSDA = readBytesUnaligned(P, sizeof(TargetPtrT));
+ TargetPtrT NewLSDA = LSDA - DeltaForEH;
+ writeBytesUnaligned(NewLSDA, P, sizeof(TargetPtrT));
}
- if (Arch == Triple::arm && RelType == macho::RIT_ARM_Branch24Bit) {
- // This is an ARM branch relocation, need to use a stub function.
+ return Ret;
+}
- // Look up for existing stub.
- StubMap::const_iterator i = Stubs.find(Value);
- if (i != Stubs.end())
- resolveRelocation(Target, (uint64_t)Target,
- (uint64_t)Section.Address + i->second,
- RelType, 0);
- else {
- // Create a new stub function.
- Stubs[Value] = Section.StubOffset;
- uint8_t *StubTargetAddr = createStubFunction(Section.Address +
- Section.StubOffset);
- addRelocation(Value, Rel.SectionID, StubTargetAddr - Section.Address,
- macho::RIT_Vanilla);
- resolveRelocation(Target, (uint64_t)Target,
- (uint64_t)Section.Address + Section.StubOffset,
- RelType, 0);
- Section.StubOffset += getMaxStubSize();
- }
- } else
- addRelocation(Value, Rel.SectionID, Rel.Offset, RelType);
+static int64_t computeDelta(SectionEntry *A, SectionEntry *B) {
+ int64_t ObjDistance =
+ static_cast<int64_t>(A->ObjAddress) - static_cast<int64_t>(B->ObjAddress);
+ int64_t MemDistance = A->LoadAddress - B->LoadAddress;
+ return ObjDistance - MemDistance;
}
+template <typename Impl>
+void RuntimeDyldMachOCRTPBase<Impl>::registerEHFrames() {
+
+ for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) {
+ EHFrameRelatedSections &SectionInfo = UnregisteredEHFrameSections[i];
+ if (SectionInfo.EHFrameSID == RTDYLD_INVALID_SECTION_ID ||
+ SectionInfo.TextSID == RTDYLD_INVALID_SECTION_ID)
+ continue;
+ SectionEntry *Text = &Sections[SectionInfo.TextSID];
+ SectionEntry *EHFrame = &Sections[SectionInfo.EHFrameSID];
+ SectionEntry *ExceptTab = nullptr;
+ if (SectionInfo.ExceptTabSID != RTDYLD_INVALID_SECTION_ID)
+ ExceptTab = &Sections[SectionInfo.ExceptTabSID];
+
+ int64_t DeltaForText = computeDelta(Text, EHFrame);
+ int64_t DeltaForEH = 0;
+ if (ExceptTab)
+ DeltaForEH = computeDelta(ExceptTab, EHFrame);
+
+ unsigned char *P = EHFrame->Address;
+ unsigned char *End = P + EHFrame->Size;
+ do {
+ P = processFDE(P, DeltaForText, DeltaForEH);
+ } while (P != End);
+
+ MemMgr.registerEHFrames(EHFrame->Address, EHFrame->LoadAddress,
+ EHFrame->Size);
+ }
+ UnregisteredEHFrameSections.clear();
+}
+
+std::unique_ptr<RuntimeDyldMachO>
+RuntimeDyldMachO::create(Triple::ArchType Arch,
+ RuntimeDyld::MemoryManager &MemMgr,
+ RuntimeDyld::SymbolResolver &Resolver) {
+ switch (Arch) {
+ default:
+ llvm_unreachable("Unsupported target for RuntimeDyldMachO.");
+ break;
+ case Triple::arm:
+ return make_unique<RuntimeDyldMachOARM>(MemMgr, Resolver);
+ case Triple::aarch64:
+ return make_unique<RuntimeDyldMachOAArch64>(MemMgr, Resolver);
+ case Triple::x86:
+ return make_unique<RuntimeDyldMachOI386>(MemMgr, Resolver);
+ case Triple::x86_64:
+ return make_unique<RuntimeDyldMachOX86_64>(MemMgr, Resolver);
+ }
+}
-bool RuntimeDyldMachO::isCompatibleFormat(
- const MemoryBuffer *InputBuffer) const {
- StringRef Magic = InputBuffer->getBuffer().slice(0, 4);
- if (Magic == "\xFE\xED\xFA\xCE") return true;
- if (Magic == "\xCE\xFA\xED\xFE") return true;
- if (Magic == "\xFE\xED\xFA\xCF") return true;
- if (Magic == "\xCF\xFA\xED\xFE") return true;
- return false;
+std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
+RuntimeDyldMachO::loadObject(const object::ObjectFile &O) {
+ unsigned SectionStartIdx, SectionEndIdx;
+ std::tie(SectionStartIdx, SectionEndIdx) = loadObjectImpl(O);
+ return llvm::make_unique<LoadedMachOObjectInfo>(*this, SectionStartIdx,
+ SectionEndIdx);
}
} // end namespace llvm
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