#include "RuntimeDyldMachO.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
+#include "ObjectImageCommon.h"
+#include "JITRegistrar.h"
using namespace llvm;
using namespace llvm::object;
namespace llvm {
+class MachOObjectImage : public ObjectImageCommon {
+private:
+ typedef SmallVector<uint64_t, 1> SectionAddrList;
+ SectionAddrList OldSectionAddrList;
+
+protected:
+ bool is64;
+ bool Registered;
+
+private:
+ void initOldAddress() {
+ MachOObjectFile *objf = static_cast<MachOObjectFile *>(ObjFile.get());
+ // Unfortunately we need to do this, since there's information encoded
+ // in the original addr of the section that we could not otherwise
+ // recover. The reason for this is that symbols do not actually store
+ // their file offset, but only their vmaddr. This means that in order
+ // to locate the symbol correctly in the object file, we need to know
+ // where the original start of the section was (including any padding,
+ // etc).
+ for (section_iterator i = objf->section_begin(), e = objf->section_end();
+ i != e; ++i) {
+ uint64_t Addr;
+ i->getAddress(Addr);
+ OldSectionAddrList[i->getRawDataRefImpl().d.a] = Addr;
+ }
+ }
+
+public:
+ MachOObjectImage(ObjectBuffer *Input, bool is64)
+ : ObjectImageCommon(Input),
+ OldSectionAddrList(ObjFile->section_end()->getRawDataRefImpl().d.a, 0),
+ is64(is64), Registered(false) {
+ initOldAddress();
+ }
+
+ MachOObjectImage(std::unique_ptr<object::ObjectFile> Input, bool is64)
+ : ObjectImageCommon(std::move(Input)),
+ OldSectionAddrList(ObjFile->section_end()->getRawDataRefImpl().d.a, 0),
+ is64(is64), Registered(false) {
+ initOldAddress();
+ }
+
+ virtual ~MachOObjectImage() {
+ if (Registered)
+ deregisterWithDebugger();
+ }
+
+ // Subclasses can override these methods to update the image with loaded
+ // addresses for sections and common symbols
+ virtual void updateSectionAddress(const SectionRef &Sec, uint64_t Addr) {
+ MachOObjectFile *objf = static_cast<MachOObjectFile *>(ObjFile.get());
+ char *data =
+ const_cast<char *>(objf->getSectionPointer(Sec.getRawDataRefImpl()));
+
+ uint64_t oldAddr = OldSectionAddrList[Sec.getRawDataRefImpl().d.a];
+
+ if (is64) {
+ ((MachO::section_64 *)data)->addr = Addr;
+ } else {
+ ((MachO::section *)data)->addr = Addr;
+ }
+
+ for (symbol_iterator i = objf->symbol_begin(), e = objf->symbol_end();
+ i != e; ++i) {
+ section_iterator symSec(objf->section_end());
+ (*i).getSection(symSec);
+ if (*symSec == Sec) {
+ uint64_t symAddr;
+ (*i).getAddress(symAddr);
+ updateSymbolAddress(*i, symAddr + Addr - oldAddr);
+ }
+ }
+ }
+
+ uint64_t getOldSectionAddr(const SectionRef &Sec) const {
+ return OldSectionAddrList[Sec.getRawDataRefImpl().d.a];
+ }
+
+ virtual void updateSymbolAddress(const SymbolRef &Sym, uint64_t Addr) {
+ char *data = const_cast<char *>(
+ reinterpret_cast<const char *>(Sym.getRawDataRefImpl().p));
+ if (is64)
+ ((MachO::nlist_64 *)data)->n_value = Addr;
+ else
+ ((MachO::nlist *)data)->n_value = Addr;
+ }
+
+ virtual void registerWithDebugger() {
+ JITRegistrar::getGDBRegistrar().registerObject(*Buffer);
+ Registered = true;
+ }
+
+ virtual void deregisterWithDebugger() {
+ JITRegistrar::getGDBRegistrar().deregisterObject(*Buffer);
+ }
+};
+
+static uint32_t readMachOMagic(const char *InputBuffer, unsigned BufferSize) {
+ if (BufferSize < 4)
+ return 0;
+ StringRef Magic(InputBuffer, 4);
+ if (Magic == "\xFE\xED\xFA\xCE" || Magic == "\xCE\xFA\xED\xFE")
+ return 0xFEEDFACE;
+ else if (Magic == "\xFE\xED\xFA\xCF" || Magic == "\xCF\xFA\xED\xFE")
+ return 0xFEEDFACF;
+ // else
+ return 0;
+}
+
+ObjectImage *RuntimeDyldMachO::createObjectImage(ObjectBuffer *Buffer) {
+ uint32_t magic = readMachOMagic(Buffer->getBufferStart(),
+ Buffer->getBufferSize());
+ bool is64 = (magic == MachO::MH_MAGIC_64);
+ assert((magic == MachO::MH_MAGIC_64 || magic == MachO::MH_MAGIC) &&
+ "Unrecognized Macho Magic");
+ return new MachOObjectImage(Buffer, is64);
+}
+
+ObjectImage *RuntimeDyldMachO::createObjectImageFromFile(
+ std::unique_ptr<object::ObjectFile> ObjFile) {
+ if (!ObjFile)
+ return nullptr;
+
+ MemoryBuffer *Buffer =
+ MemoryBuffer::getMemBuffer(ObjFile->getData(), "", false);
+
+ uint32_t magic = readMachOMagic(Buffer->getBufferStart(),
+ Buffer->getBufferSize());
+ bool is64 = (magic == MachO::MH_MAGIC_64);
+ assert((magic == MachO::MH_MAGIC_64 || magic == MachO::MH_MAGIC) &&
+ "Unrecognized Macho Magic");
+ return new MachOObjectImage(std::move(ObjFile), is64);
+}
+
static unsigned char *processFDE(unsigned char *P, intptr_t DeltaForText,
intptr_t DeltaForEH) {
+ DEBUG(dbgs() << "Processing FDE: Delta for text: " << DeltaForText
+ << ", Delta for EH: " << DeltaForEH << "\n");
uint32_t Length = *((uint32_t *)P);
P += 4;
unsigned char *Ret = P + Length;
continue;
SectionEntry *Text = &Sections[SectionInfo.TextSID];
SectionEntry *EHFrame = &Sections[SectionInfo.EHFrameSID];
- SectionEntry *ExceptTab = NULL;
+ SectionEntry *ExceptTab = nullptr;
if (SectionInfo.ExceptTabSID != RTDYLD_INVALID_SECTION_ID)
ExceptTab = &Sections[SectionInfo.ExceptTabSID];
UnregisteredEHFrameSections.clear();
}
-void RuntimeDyldMachO::finalizeLoad(ObjSectionToIDMap &SectionMap) {
+void RuntimeDyldMachO::finalizeLoad(ObjectImage &ObjImg,
+ ObjSectionToIDMap &SectionMap) {
unsigned EHFrameSID = RTDYLD_INVALID_SECTION_ID;
unsigned TextSID = RTDYLD_INVALID_SECTION_ID;
unsigned ExceptTabSID = RTDYLD_INVALID_SECTION_ID;
TextSID = i->second;
else if (Name == "__gcc_except_tab")
ExceptTabSID = i->second;
+ else if (Name == "__jump_table")
+ populateJumpTable(cast<MachOObjectFile>(*ObjImg.getObjectFile()),
+ Section, i->second);
+ else if (Name == "__pointers")
+ populatePointersSection(cast<MachOObjectFile>(*ObjImg.getObjectFile()),
+ Section, i->second);
}
UnregisteredEHFrameSections.push_back(
EHFrameRelatedSections(EHFrameSID, TextSID, ExceptTabSID));
// symbol in the target address space.
void RuntimeDyldMachO::resolveRelocation(const RelocationEntry &RE,
uint64_t Value) {
- const SectionEntry &Section = Sections[RE.SectionID];
- return resolveRelocation(Section, RE.Offset, Value, RE.RelType, RE.Addend,
- RE.IsPCRel, RE.Size);
-}
-
-void RuntimeDyldMachO::resolveRelocation(const SectionEntry &Section,
- uint64_t Offset, uint64_t Value,
- uint32_t Type, int64_t Addend,
- bool isPCRel, unsigned LogSize) {
- uint8_t *LocalAddress = Section.Address + Offset;
- uint64_t FinalAddress = Section.LoadAddress + Offset;
- unsigned MachoType = Type;
- unsigned Size = 1 << LogSize;
-
- DEBUG(dbgs() << "resolveRelocation LocalAddress: "
- << format("%p", LocalAddress)
- << " FinalAddress: " << format("%p", FinalAddress)
- << " Value: " << format("%p", Value) << " Addend: " << Addend
- << " isPCRel: " << isPCRel << " MachoType: " << MachoType
- << " Size: " << Size << "\n");
+ DEBUG (
+ 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("%p", FinalAddress)
+ << " Value: " << format("%p", Value)
+ << " Addend: " << RE.Addend
+ << " isPCRel: " << RE.IsPCRel
+ << " MachoType: " << RE.RelType
+ << " Size: " << (1 << RE.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);
+ resolveX86_64Relocation(RE, Value);
break;
case Triple::x86:
- resolveI386Relocation(LocalAddress, FinalAddress, (uintptr_t)Value, isPCRel,
- MachoType, Size, Addend);
+ resolveI386Relocation(RE, Value);
break;
case Triple::arm: // Fall through.
case Triple::thumb:
- resolveARMRelocation(LocalAddress, FinalAddress, (uintptr_t)Value, isPCRel,
- MachoType, Size, Addend);
+ resolveARMRelocation(RE, Value);
break;
+ case Triple::aarch64:
case Triple::arm64:
- resolveARM64Relocation(LocalAddress, FinalAddress, (uintptr_t)Value,
- isPCRel, MachoType, Size, Addend);
+ resolveAArch64Relocation(RE, Value);
break;
}
}
-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
+bool RuntimeDyldMachO::resolveI386Relocation(const RelocationEntry &RE,
+ uint64_t Value) {
+ const SectionEntry &Section = Sections[RE.SectionID];
+ uint8_t* LocalAddress = Section.Address + RE.Offset;
- switch (Type) {
- default:
- llvm_unreachable("Invalid relocation type!");
- case MachO::GENERIC_RELOC_VANILLA: {
- uint8_t *p = LocalAddress;
- uint64_t ValueToWrite = Value + Addend;
- for (unsigned i = 0; i < Size; ++i) {
- *p++ = (uint8_t)(ValueToWrite & 0xff);
- ValueToWrite >>= 8;
- }
- return false;
+ if (RE.IsPCRel) {
+ uint64_t FinalAddress = Section.LoadAddress + RE.Offset;
+ Value -= FinalAddress + 4; // see MachOX86_64::resolveRelocation.
}
- case MachO::GENERIC_RELOC_SECTDIFF:
- case MachO::GENERIC_RELOC_LOCAL_SECTDIFF:
- case MachO::GENERIC_RELOC_PB_LA_PTR:
- return Error("Relocation type not implemented yet!");
+
+ switch (RE.RelType) {
+ default:
+ llvm_unreachable("Invalid relocation type!");
+ case MachO::GENERIC_RELOC_VANILLA:
+ return applyRelocationValue(LocalAddress, Value + RE.Addend,
+ 1 << RE.Size);
+ case MachO::GENERIC_RELOC_SECTDIFF:
+ case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
+ uint64_t SectionABase = Sections[RE.Sections.SectionA].LoadAddress;
+ uint64_t SectionBBase = Sections[RE.Sections.SectionB].LoadAddress;
+ assert((Value == SectionABase || Value == SectionBBase) &&
+ "Unexpected SECTDIFF relocation value.");
+ Value = SectionABase - SectionBBase + RE.Addend;
+ return applyRelocationValue(LocalAddress, Value, 1 << RE.Size);
+ }
+ case MachO::GENERIC_RELOC_PB_LA_PTR:
+ return Error("Relocation type not implemented yet!");
}
}
-bool RuntimeDyldMachO::resolveX86_64Relocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value, bool isPCRel,
- unsigned Type, unsigned Size,
- int64_t Addend) {
+bool RuntimeDyldMachO::resolveX86_64Relocation(const RelocationEntry &RE,
+ uint64_t Value) {
+ const SectionEntry &Section = Sections[RE.SectionID];
+ uint8_t* LocalAddress = Section.Address + RE.Offset;
+
// If the relocation is PC-relative, the value to be encoded is the
// pointer difference.
- if (isPCRel)
+ if (RE.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;
+ uint64_t FinalAddress = Section.LoadAddress + RE.Offset;
+ Value -= FinalAddress + 4; // see MachOX86_64::resolveRelocation.
+ }
- switch (Type) {
+ switch (RE.RelType) {
default:
llvm_unreachable("Invalid relocation type!");
case MachO::X86_64_RELOC_SIGNED_1:
case MachO::X86_64_RELOC_SIGNED_4:
case MachO::X86_64_RELOC_SIGNED:
case MachO::X86_64_RELOC_UNSIGNED:
- case MachO::X86_64_RELOC_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;
- }
+ case MachO::X86_64_RELOC_BRANCH:
+ return applyRelocationValue(LocalAddress, Value + RE.Addend, 1 << RE.Size);
case MachO::X86_64_RELOC_GOT_LOAD:
case MachO::X86_64_RELOC_GOT:
case MachO::X86_64_RELOC_SUBTRACTOR:
}
}
-bool RuntimeDyldMachO::resolveARMRelocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value, bool isPCRel,
- unsigned Type, unsigned Size,
- int64_t Addend) {
+bool RuntimeDyldMachO::resolveARMRelocation(const RelocationEntry &RE,
+ uint64_t Value) {
+ const SectionEntry &Section = Sections[RE.SectionID];
+ uint8_t* LocalAddress = Section.Address + RE.Offset;
+
// If the relocation is PC-relative, the value to be encoded is the
// pointer difference.
- if (isPCRel) {
+ if (RE.IsPCRel) {
+ uint64_t FinalAddress = Section.LoadAddress + RE.Offset;
Value -= FinalAddress;
// ARM PCRel relocations have an effective-PC offset of two instructions
// (four bytes in Thumb mode, 8 bytes in ARM mode).
Value -= 8;
}
- switch (Type) {
+ switch (RE.RelType) {
default:
llvm_unreachable("Invalid relocation type!");
- case MachO::ARM_RELOC_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;
- }
- break;
- }
+ case MachO::ARM_RELOC_VANILLA:
+ return applyRelocationValue(LocalAddress, Value, 1 << RE.Size);
case MachO::ARM_RELOC_BR24: {
// Mask the value into the target address. We know instructions are
// 32-bit aligned, so we can do it all at once.
// The low two bits of the value are not encoded.
Value >>= 2;
// Mask the value to 24 bits.
- Value &= 0xffffff;
+ uint64_t FinalValue = Value & 0xffffff;
+ // Check for overflow.
+ if (Value != FinalValue)
+ return Error("ARM BR24 relocation out of range.");
// 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;
+ *p = (*p & ~0xffffff) | FinalValue;
break;
}
case MachO::ARM_THUMB_RELOC_BR22:
return false;
}
-bool RuntimeDyldMachO::resolveARM64Relocation(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;
+bool RuntimeDyldMachO::resolveAArch64Relocation(const RelocationEntry &RE,
+ uint64_t Value) {
+ const SectionEntry &Section = Sections[RE.SectionID];
+ uint8_t* LocalAddress = Section.Address + RE.Offset;
- switch (Type) {
+ switch (RE.RelType) {
default:
llvm_unreachable("Invalid relocation type!");
case MachO::ARM64_RELOC_UNSIGNED: {
+ assert(!RE.IsPCRel && "PCRel and ARM64_RELOC_UNSIGNED not supported");
// 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;
- }
+ if (RE.Size < 2)
+ llvm_unreachable("Invalid size for ARM64_RELOC_UNSIGNED");
+
+ applyRelocationValue(LocalAddress, Value + RE.Addend, 1 << RE.Size);
break;
}
case MachO::ARM64_RELOC_BRANCH26: {
+ assert(RE.IsPCRel && "not PCRel and ARM64_RELOC_BRANCH26 not supported");
// 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 26 bits.
- Value &= 0x3ffffff;
+ uint32_t *p = (uint32_t*)LocalAddress;
+ // Check if the addend is encoded in the instruction.
+ uint32_t EncodedAddend = *p & 0x03FFFFFF;
+ if (EncodedAddend != 0 ) {
+ if (RE.Addend == 0)
+ llvm_unreachable("branch26 instruction has embedded addend.");
+ else
+ llvm_unreachable("branch26 instruction has embedded addend and" \
+ "ARM64_RELOC_ADDEND.");
+ }
+ // Check if branch is in range.
+ uint64_t FinalAddress = Section.LoadAddress + RE.Offset;
+ uint64_t PCRelVal = Value - FinalAddress + RE.Addend;
+ assert(isInt<26>(PCRelVal) && "Branch target out of range!");
// Insert the value into the instruction.
- *p = (*p & ~0x3ffffff) | Value;
+ *p = (*p & 0xFC000000) | ((uint32_t)(PCRelVal >> 2) & 0x03FFFFFF);
break;
}
- case MachO::ARM64_RELOC_SUBTRACTOR:
- case MachO::ARM64_RELOC_PAGE21:
- case MachO::ARM64_RELOC_PAGEOFF12:
case MachO::ARM64_RELOC_GOT_LOAD_PAGE21:
+ case MachO::ARM64_RELOC_PAGE21: {
+ assert(RE.IsPCRel && "not PCRel and ARM64_RELOC_PAGE21 not supported");
+ // 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;
+ // Check if the addend is encoded in the instruction.
+ uint32_t EncodedAddend = ((*p & 0x60000000) >> 29) |
+ ((*p & 0x01FFFFE0) >> 3);
+ if (EncodedAddend != 0) {
+ if (RE.Addend == 0)
+ llvm_unreachable("adrp instruction has embedded addend.");
+ else
+ llvm_unreachable("adrp instruction has embedded addend and" \
+ "ARM64_RELOC_ADDEND.");
+ }
+ // Adjust for PC-relative relocation and offset.
+ uint64_t FinalAddress = Section.LoadAddress + RE.Offset;
+ uint64_t PCRelVal = ((Value + RE.Addend) & (-4096)) -
+ (FinalAddress & (-4096));
+ // Check that the value fits into 21 bits (+ 12 lower bits).
+ assert(isInt<33>(PCRelVal) && "Invalid page reloc value!");
+ // Insert the value into the instruction.
+ uint32_t ImmLoValue = (uint32_t)(PCRelVal << 17) & 0x60000000;
+ uint32_t ImmHiValue = (uint32_t)(PCRelVal >> 9) & 0x00FFFFE0;
+ *p = (*p & 0x9F00001F) | ImmHiValue | ImmLoValue;
+ break;
+ }
case MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12:
+ case MachO::ARM64_RELOC_PAGEOFF12: {
+ assert(!RE.IsPCRel && "PCRel and ARM64_RELOC_PAGEOFF21 not supported");
+ // 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;
+ // Check if the addend is encoded in the instruction.
+ uint32_t EncodedAddend = *p & 0x003FFC00;
+ if (EncodedAddend != 0) {
+ if (RE.Addend == 0)
+ llvm_unreachable("adrp instruction has embedded addend.");
+ else
+ llvm_unreachable("adrp instruction has embedded addend and" \
+ "ARM64_RELOC_ADDEND.");
+ }
+ // Add the offset from the symbol.
+ Value += RE.Addend;
+ // Mask out the page address and only use the lower 12 bits.
+ Value &= 0xFFF;
+ // Check which instruction we are updating to obtain the implicit shift
+ // factor from LDR/STR instructions.
+ if (*p & 0x08000000) {
+ uint32_t ImplicitShift = ((*p >> 30) & 0x3);
+ switch (ImplicitShift) {
+ case 0:
+ // Check if this a vector op.
+ if ((*p & 0x04800000) == 0x04800000) {
+ ImplicitShift = 4;
+ assert(((Value & 0xF) == 0) &&
+ "128-bit LDR/STR not 16-byte aligned.");
+ }
+ break;
+ case 1:
+ assert(((Value & 0x1) == 0) && "16-bit LDR/STR not 2-byte aligned.");
+ case 2:
+ assert(((Value & 0x3) == 0) && "32-bit LDR/STR not 4-byte aligned.");
+ case 3:
+ assert(((Value & 0x7) == 0) && "64-bit LDR/STR not 8-byte aligned.");
+ }
+ // Compensate for implicit shift.
+ Value >>= ImplicitShift;
+ }
+ // Insert the value into the instruction.
+ *p = (*p & 0xFFC003FF) | ((uint32_t)(Value << 10) & 0x003FFC00);
+ break;
+ }
+ case MachO::ARM64_RELOC_SUBTRACTOR:
case MachO::ARM64_RELOC_POINTER_TO_GOT:
case MachO::ARM64_RELOC_TLVP_LOAD_PAGE21:
case MachO::ARM64_RELOC_TLVP_LOAD_PAGEOFF12:
- case MachO::ARM64_RELOC_ADDEND:
+ llvm_unreachable("Relocation type not implemented yet!");
return Error("Relocation type not implemented yet!");
+ case MachO::ARM64_RELOC_ADDEND:
+ llvm_unreachable("ARM64_RELOC_ADDEND should have been handeled by " \
+ "processRelocationRef!");
}
return false;
}
+void RuntimeDyldMachO::populateJumpTable(MachOObjectFile &Obj,
+ const SectionRef &JTSection,
+ unsigned JTSectionID) {
+ assert(!Obj.is64Bit() &&
+ "__jump_table section not supported in 64-bit MachO.");
+
+ MachO::dysymtab_command DySymTabCmd = Obj.getDysymtabLoadCommand();
+ MachO::section Sec32 = Obj.getSection(JTSection.getRawDataRefImpl());
+ uint32_t JTSectionSize = Sec32.size;
+ unsigned FirstIndirectSymbol = Sec32.reserved1;
+ unsigned JTEntrySize = Sec32.reserved2;
+ unsigned NumJTEntries = JTSectionSize / JTEntrySize;
+ uint8_t* JTSectionAddr = getSectionAddress(JTSectionID);
+ unsigned JTEntryOffset = 0;
+
+ assert((JTSectionSize % JTEntrySize) == 0 &&
+ "Jump-table section does not contain a whole number of stubs?");
+
+ for (unsigned i = 0; i < NumJTEntries; ++i) {
+ unsigned SymbolIndex =
+ Obj.getIndirectSymbolTableEntry(DySymTabCmd, FirstIndirectSymbol + i);
+ symbol_iterator SI = Obj.getSymbolByIndex(SymbolIndex);
+ StringRef IndirectSymbolName;
+ SI->getName(IndirectSymbolName);
+ uint8_t* JTEntryAddr = JTSectionAddr + JTEntryOffset;
+ createStubFunction(JTEntryAddr);
+ RelocationEntry RE(JTSectionID, JTEntryOffset + 1,
+ MachO::GENERIC_RELOC_VANILLA, 0, true, 2);
+ addRelocationForSymbol(RE, IndirectSymbolName);
+ JTEntryOffset += JTEntrySize;
+ }
+}
+
+void RuntimeDyldMachO::populatePointersSection(MachOObjectFile &Obj,
+ const SectionRef &PTSection,
+ unsigned PTSectionID) {
+ assert(!Obj.is64Bit() &&
+ "__pointers 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 __pointers, 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;
+ }
+}
+
+
+section_iterator 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, SSize;
+ SI->getAddress(SAddr);
+ SI->getSize(SSize);
+ if ((Addr >= SAddr) && (Addr < SAddr + SSize))
+ return SI;
+ }
+
+ return SE;
+}
+
+relocation_iterator RuntimeDyldMachO::processSECTDIFFRelocation(
+ unsigned SectionID,
+ relocation_iterator RelI,
+ ObjectImage &Obj,
+ ObjSectionToIDMap &ObjSectionToID) {
+ const MachOObjectFile *MachO =
+ static_cast<const MachOObjectFile*>(Obj.getObjectFile());
+ MachO::any_relocation_info RE =
+ MachO->getRelocation(RelI->getRawDataRefImpl());
+
+ SectionEntry &Section = Sections[SectionID];
+ uint32_t RelocType = MachO->getAnyRelocationType(RE);
+ bool IsPCRel = MachO->getAnyRelocationPCRel(RE);
+ unsigned Size = MachO->getAnyRelocationLength(RE);
+ uint64_t Offset;
+ RelI->getOffset(Offset);
+ uint8_t *LocalAddress = Section.Address + Offset;
+ unsigned NumBytes = 1 << Size;
+ int64_t Addend = 0;
+ memcpy(&Addend, LocalAddress, NumBytes);
+
+ ++RelI;
+ MachO::any_relocation_info RE2 =
+ MachO->getRelocation(RelI->getRawDataRefImpl());
+
+ uint32_t AddrA = MachO->getScatteredRelocationValue(RE);
+ section_iterator SAI = getSectionByAddress(*MachO, AddrA);
+ assert(SAI != MachO->section_end() && "Can't find section for address A");
+ uint64_t SectionABase;
+ SAI->getAddress(SectionABase);
+ uint64_t SectionAOffset = AddrA - SectionABase;
+ SectionRef SectionA = *SAI;
+ bool IsCode;
+ SectionA.isText(IsCode);
+ uint32_t SectionAID = findOrEmitSection(Obj, SectionA, IsCode,
+ ObjSectionToID);
+
+ uint32_t AddrB = MachO->getScatteredRelocationValue(RE2);
+ section_iterator SBI = getSectionByAddress(*MachO, AddrB);
+ assert(SBI != MachO->section_end() && "Can't find section for address B");
+ uint64_t SectionBBase;
+ SBI->getAddress(SectionBBase);
+ uint64_t SectionBOffset = AddrB - SectionBBase;
+ SectionRef SectionB = *SBI;
+ uint32_t SectionBID = findOrEmitSection(Obj, SectionB, IsCode,
+ ObjSectionToID);
+
+ if (Addend != AddrA - AddrB)
+ Error("Unexpected SECTDIFF relocation addend.");
+
+ DEBUG(dbgs() << "Found SECTDIFF: AddrA: " << AddrA << ", AddrB: " << AddrB
+ << ", Addend: " << Addend << ", SectionA ID: "
+ << SectionAID << ", SectionAOffset: " << SectionAOffset
+ << ", SectionB ID: " << SectionBID << ", SectionBOffset: "
+ << SectionBOffset << "\n");
+ RelocationEntry R(SectionID, Offset, RelocType, 0,
+ SectionAID, SectionAOffset, SectionBID, SectionBOffset,
+ IsPCRel, Size);
+
+ addRelocationForSection(R, SectionAID);
+ addRelocationForSection(R, SectionBID);
+
+ return ++RelI;
+}
+
+relocation_iterator RuntimeDyldMachO::processI386ScatteredVANILLA(
+ unsigned SectionID,
+ relocation_iterator RelI,
+ ObjectImage &Obj,
+ ObjSectionToIDMap &ObjSectionToID) {
+ const MachOObjectFile *MachO =
+ static_cast<const MachOObjectFile*>(Obj.getObjectFile());
+ MachO::any_relocation_info RE =
+ MachO->getRelocation(RelI->getRawDataRefImpl());
+
+ SectionEntry &Section = Sections[SectionID];
+ uint32_t RelocType = MachO->getAnyRelocationType(RE);
+ bool IsPCRel = MachO->getAnyRelocationPCRel(RE);
+ unsigned Size = MachO->getAnyRelocationLength(RE);
+ uint64_t Offset;
+ RelI->getOffset(Offset);
+ uint8_t *LocalAddress = Section.Address + Offset;
+ unsigned NumBytes = 1 << Size;
+ int64_t Addend = 0;
+ memcpy(&Addend, LocalAddress, NumBytes);
+
+ unsigned SymbolBaseAddr = MachO->getScatteredRelocationValue(RE);
+ section_iterator TargetSI = getSectionByAddress(*MachO, SymbolBaseAddr);
+ assert(TargetSI != MachO->section_end() && "Can't find section for symbol");
+ uint64_t SectionBaseAddr;
+ TargetSI->getAddress(SectionBaseAddr);
+ SectionRef TargetSection = *TargetSI;
+ bool IsCode;
+ TargetSection.isText(IsCode);
+ uint32_t TargetSectionID = findOrEmitSection(Obj, TargetSection, IsCode,
+ ObjSectionToID);
+
+ Addend -= SectionBaseAddr;
+ RelocationEntry R(SectionID, Offset, RelocType, Addend,
+ IsPCRel, Size);
+
+ addRelocationForSection(R, TargetSectionID);
+
+ return ++RelI;
+}
+
relocation_iterator RuntimeDyldMachO::processRelocationRef(
unsigned SectionID, relocation_iterator RelI, ObjectImage &Obj,
ObjSectionToIDMap &ObjSectionToID, const SymbolTableMap &Symbols,
StubMap &Stubs) {
const ObjectFile *OF = Obj.getObjectFile();
+ const MachOObjectImage &MachOObj = *static_cast<MachOObjectImage *>(&Obj);
const MachOObjectFile *MachO = static_cast<const MachOObjectFile *>(OF);
MachO::any_relocation_info RE =
MachO->getRelocation(RelI->getRawDataRefImpl());
+ int64_t RelocAddendValue = 0;
+ bool HasRelocAddendValue = false;
uint32_t RelType = MachO->getAnyRelocationType(RE);
+ if (Arch == Triple::arm64) {
+ // ARM64_RELOC_ADDEND provides the offset (addend) that will be used by the
+ // next relocation entry. Save the value and advance to the next relocation
+ // entry.
+ if (RelType == MachO::ARM64_RELOC_ADDEND) {
+ assert(!MachO->getPlainRelocationExternal(RE));
+ assert(!MachO->getAnyRelocationPCRel(RE));
+ assert(MachO->getAnyRelocationLength(RE) == 2);
+ uint64_t RawAddend = MachO->getPlainRelocationSymbolNum(RE);
+ // Sign-extend the 24-bit to 64-bit.
+ RelocAddendValue = RawAddend << 40;
+ RelocAddendValue >>= 40;
+ HasRelocAddendValue = true;
+
+ // Get the next entry.
+ RE = MachO->getRelocation((++RelI)->getRawDataRefImpl());
+ RelType = MachO->getAnyRelocationType(RE);
+ assert(RelType == MachO::ARM64_RELOC_BRANCH26 ||
+ RelType == MachO::ARM64_RELOC_PAGE21 ||
+ RelType == MachO::ARM64_RELOC_PAGEOFF12);
+
+ } else if (RelType == MachO::ARM64_RELOC_BRANCH26 ||
+ RelType == MachO::ARM64_RELOC_PAGE21 ||
+ RelType == MachO::ARM64_RELOC_PAGEOFF12 ||
+ RelType == MachO::ARM64_RELOC_GOT_LOAD_PAGE21 ||
+ RelType == MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12) {
+ RelocAddendValue = 0;
+ HasRelocAddendValue = true;
+ }
+ }
// FIXME: Properly handle scattered relocations.
- // For now, optimistically skip these: they can often be ignored, as
- // the static linker will already have applied the relocation, and it
- // only needs to be reapplied if symbols move relative to one another.
- // Note: This will fail horribly where the relocations *do* need to be
- // applied, but that was already the case.
- if (MachO->isRelocationScattered(RE))
- return ++RelI;
+ // Special case the couple of scattered relocations that we know how
+ // to handle: SECTDIFF relocations, and scattered VANILLA relocations
+ // on I386.
+ // For all other scattered relocations, just bail out and hope for the
+ // best, since the offsets computed by scattered relocations have often
+ // been optimisticaly filled in by the compiler. This will fail
+ // horribly where the relocations *do* need to be applied, but that was
+ // already the case.
+ if (MachO->isRelocationScattered(RE)) {
+ if (RelType == MachO::GENERIC_RELOC_SECTDIFF ||
+ RelType == MachO::GENERIC_RELOC_LOCAL_SECTDIFF)
+ return processSECTDIFFRelocation(SectionID, RelI, Obj, ObjSectionToID);
+ else if (Arch == Triple::x86 && RelType == MachO::GENERIC_RELOC_VANILLA)
+ return processI386ScatteredVANILLA(SectionID, RelI, Obj, ObjSectionToID);
+ else
+ return ++RelI;
+ }
RelocationValueRef Value;
SectionEntry &Section = Sections[SectionID];
- bool isExtern = MachO->getPlainRelocationExternal(RE);
+ bool IsExtern = MachO->getPlainRelocationExternal(RE);
bool IsPCRel = MachO->getAnyRelocationPCRel(RE);
unsigned Size = MachO->getAnyRelocationLength(RE);
uint64_t Offset;
RelI->getOffset(Offset);
uint8_t *LocalAddress = Section.Address + Offset;
unsigned NumBytes = 1 << Size;
- uint64_t Addend = 0;
- memcpy(&Addend, LocalAddress, NumBytes);
+ int64_t Addend = 0;
+ if (HasRelocAddendValue)
+ Addend = RelocAddendValue;
+ else
+ memcpy(&Addend, LocalAddress, NumBytes);
- if (isExtern) {
+ if (IsExtern) {
// Obtain the symbol name which is referenced in the relocation
symbol_iterator Symbol = RelI->getSymbol();
StringRef TargetName;
Value.Addend = Addend;
}
}
+
+ // Addends for external, PC-rel relocations on i386 point back to the zero
+ // offset. Calculate the final offset from the relocation target instead.
+ // This allows us to use the same logic for both external and internal
+ // relocations in resolveI386RelocationRef.
+ if (Arch == Triple::x86 && IsPCRel) {
+ uint64_t RelocAddr = 0;
+ RelI->getAddress(RelocAddr);
+ Value.Addend += RelocAddr + 4;
+ }
+
} else {
SectionRef Sec = MachO->getRelocationSection(RE);
bool IsCode = false;
Sec.isText(IsCode);
Value.SectionID = findOrEmitSection(Obj, Sec, IsCode, ObjSectionToID);
- uint64_t Addr;
- Sec.getAddress(Addr);
+ uint64_t Addr = MachOObj.getOldSectionAddr(Sec);
+ DEBUG(dbgs() << "\nAddr: " << Addr << "\nAddend: " << Addend);
Value.Addend = Addend - Addr;
if (IsPCRel)
Value.Addend += Offset + NumBytes;
RelType == MachO::X86_64_RELOC_GOT_LOAD)) {
assert(IsPCRel);
assert(Size == 2);
+
+ // FIXME: Teach the generic code above not to prematurely conflate
+ // relocation addends and symbol offsets.
+ Value.Addend -= Addend;
StubMap::const_iterator i = Stubs.find(Value);
uint8_t *Addr;
if (i != Stubs.end()) {
} else {
Stubs[Value] = Section.StubOffset;
uint8_t *GOTEntry = Section.Address + Section.StubOffset;
- RelocationEntry RE(SectionID, Section.StubOffset,
- MachO::X86_64_RELOC_UNSIGNED, 0, false, 3);
+ RelocationEntry GOTRE(SectionID, Section.StubOffset,
+ MachO::X86_64_RELOC_UNSIGNED, Value.Addend, false,
+ 3);
if (Value.SymbolName)
- addRelocationForSymbol(RE, Value.SymbolName);
+ addRelocationForSymbol(GOTRE, Value.SymbolName);
else
- addRelocationForSection(RE, Value.SectionID);
+ addRelocationForSection(GOTRE, Value.SectionID);
Section.StubOffset += 8;
Addr = GOTEntry;
}
- resolveRelocation(Section, Offset, (uint64_t)Addr,
- MachO::X86_64_RELOC_UNSIGNED, Value.Addend, true, 2);
+ RelocationEntry TargetRE(SectionID, Offset,
+ MachO::X86_64_RELOC_UNSIGNED, Addend, true,
+ 2);
+ resolveRelocation(TargetRE, (uint64_t)Addr);
} else if (Arch == Triple::arm && (RelType & 0xf) == MachO::ARM_RELOC_BR24) {
// This is an ARM branch relocation, need to use a stub function.
// Look up for existing stub.
StubMap::const_iterator i = Stubs.find(Value);
- if (i != Stubs.end())
- resolveRelocation(Section, Offset, (uint64_t)Section.Address + i->second,
- RelType, 0, IsPCRel, Size);
- else {
+ uint8_t *Addr;
+ if (i != Stubs.end()) {
+ Addr = Section.Address + i->second;
+ } else {
// Create a new stub function.
Stubs[Value] = Section.StubOffset;
uint8_t *StubTargetAddr =
createStubFunction(Section.Address + Section.StubOffset);
- RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
- MachO::GENERIC_RELOC_VANILLA, Value.Addend);
+ RelocationEntry StubRE(SectionID, StubTargetAddr - Section.Address,
+ MachO::GENERIC_RELOC_VANILLA, Value.Addend);
if (Value.SymbolName)
- addRelocationForSymbol(RE, Value.SymbolName);
+ addRelocationForSymbol(StubRE, Value.SymbolName);
else
- addRelocationForSection(RE, Value.SectionID);
- resolveRelocation(Section, Offset,
- (uint64_t)Section.Address + Section.StubOffset, RelType,
- 0, IsPCRel, Size);
+ addRelocationForSection(StubRE, Value.SectionID);
+ Addr = Section.Address + Section.StubOffset;
Section.StubOffset += getMaxStubSize();
}
+ RelocationEntry TargetRE(Value.SectionID, Offset, RelType, 0, IsPCRel,
+ Size);
+ resolveRelocation(TargetRE, (uint64_t)Addr);
+ } else if (Arch == Triple::arm64 &&
+ (RelType == MachO::ARM64_RELOC_GOT_LOAD_PAGE21 ||
+ RelType == MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12)) {
+ assert(Size == 2);
+ StubMap::const_iterator i = Stubs.find(Value);
+ uint8_t *Addr;
+ if (i != Stubs.end())
+ Addr = Section.Address + i->second;
+ else {
+ // FIXME: There must be a better way to do this then to check and fix the
+ // alignment every time!!!
+ uintptr_t BaseAddress = uintptr_t(Section.Address);
+ uintptr_t StubAlignment = getStubAlignment();
+ uintptr_t StubAddress
+ = (BaseAddress + Section.StubOffset + StubAlignment - 1) &
+ -StubAlignment;
+ unsigned StubOffset = StubAddress - BaseAddress;
+ Stubs[Value] = StubOffset;
+ assert(((StubAddress % getStubAlignment()) == 0) &&
+ "GOT entry not aligned");
+ RelocationEntry GOTRE(SectionID, StubOffset, MachO::ARM64_RELOC_UNSIGNED,
+ Value.Addend, /*IsPCRel=*/false, /*Size=*/3);
+ if (Value.SymbolName)
+ addRelocationForSymbol(GOTRE, Value.SymbolName);
+ else
+ addRelocationForSection(GOTRE, Value.SectionID);
+ Section.StubOffset = StubOffset + getMaxStubSize();
+
+ Addr = (uint8_t *)StubAddress;
+ }
+ RelocationEntry TargetRE(SectionID, Offset, RelType, /*Addend=*/0, IsPCRel,
+ Size);
+ resolveRelocation(TargetRE, (uint64_t)Addr);
} else {
+
RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, IsPCRel, Size);
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
bool
RuntimeDyldMachO::isCompatibleFormat(const ObjectBuffer *InputBuffer) const {
- if (InputBuffer->getBufferSize() < 4)
- return false;
- StringRef Magic(InputBuffer->getBufferStart(), 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;
+ uint32_t Magic = readMachOMagic(InputBuffer->getBufferStart(),
+ InputBuffer->getBufferSize());
+ return (Magic == 0xFEEDFACE || Magic == 0xFEEDFACF);
}
bool RuntimeDyldMachO::isCompatibleFile(const object::ObjectFile *Obj) const {
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