//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "dyld"
#include "llvm/ExecutionEngine/RuntimeDyld.h"
-#include "ObjectImageCommon.h"
+#include "RuntimeDyldCheckerImpl.h"
#include "RuntimeDyldELF.h"
#include "RuntimeDyldImpl.h"
#include "RuntimeDyldMachO.h"
-#include "llvm/Support/FileSystem.h"
+#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MutexGuard.h"
-#include "llvm/Object/ELF.h"
using namespace llvm;
using namespace llvm::object;
+#define DEBUG_TYPE "dyld"
+
// Empty out-of-line virtual destructor as the key function.
RuntimeDyldImpl::~RuntimeDyldImpl() {}
+// Pin LoadedObjectInfo's vtables to this file.
+void RuntimeDyld::LoadedObjectInfo::anchor() {}
+
namespace llvm {
-void RuntimeDyldImpl::registerEHFrames() {
-}
+void RuntimeDyldImpl::registerEHFrames() {}
+
+void RuntimeDyldImpl::deregisterEHFrames() {}
+
+#ifndef NDEBUG
+static void dumpSectionMemory(const SectionEntry &S, StringRef State) {
+ dbgs() << "----- Contents of section " << S.Name << " " << State << " -----";
+
+ if (S.Address == nullptr) {
+ dbgs() << "\n <section not emitted>\n";
+ return;
+ }
-void RuntimeDyldImpl::deregisterEHFrames() {
+ const unsigned ColsPerRow = 16;
+
+ uint8_t *DataAddr = S.Address;
+ uint64_t LoadAddr = S.LoadAddress;
+
+ unsigned StartPadding = LoadAddr & (ColsPerRow - 1);
+ unsigned BytesRemaining = S.Size;
+
+ if (StartPadding) {
+ dbgs() << "\n" << format("0x%016" PRIx64, LoadAddr & ~(ColsPerRow - 1)) << ":";
+ while (StartPadding--)
+ dbgs() << " ";
+ }
+
+ while (BytesRemaining > 0) {
+ if ((LoadAddr & (ColsPerRow - 1)) == 0)
+ dbgs() << "\n" << format("0x%016" PRIx64, LoadAddr) << ":";
+
+ dbgs() << " " << format("%02x", *DataAddr);
+
+ ++DataAddr;
+ ++LoadAddr;
+ --BytesRemaining;
+ }
+
+ dbgs() << "\n";
}
+#endif
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
// symbol for the relocation is located. The SectionID in the relocation
// entry provides the section to which the relocation will be applied.
uint64_t Addr = Sections[i].LoadAddress;
- DEBUG(dbgs() << "Resolving relocations Section #" << i
- << "\t" << format("%p", (uint8_t *)Addr)
- << "\n");
+ DEBUG(dbgs() << "Resolving relocations Section #" << i << "\t"
+ << format("0x%x", Addr) << "\n");
+ DEBUG(dumpSectionMemory(Sections[i], "before relocations"));
resolveRelocationList(Relocations[i], Addr);
+ DEBUG(dumpSectionMemory(Sections[i], "after relocations"));
Relocations.erase(i);
}
}
llvm_unreachable("Attempting to remap address of unknown section!");
}
-// Subclasses can implement this method to create specialized image instances.
-// The caller owns the pointer that is returned.
-ObjectImage *RuntimeDyldImpl::createObjectImage(ObjectBuffer *InputBuffer) {
- return new ObjectImageCommon(InputBuffer);
+static std::error_code getOffset(const SymbolRef &Sym, uint64_t &Result) {
+ uint64_t Address;
+ if (std::error_code EC = Sym.getAddress(Address))
+ return EC;
+
+ if (Address == UnknownAddressOrSize) {
+ Result = UnknownAddressOrSize;
+ return object_error::success;
+ }
+
+ const ObjectFile *Obj = Sym.getObject();
+ section_iterator SecI(Obj->section_begin());
+ if (std::error_code EC = Sym.getSection(SecI))
+ return EC;
+
+ if (SecI == Obj->section_end()) {
+ Result = UnknownAddressOrSize;
+ return object_error::success;
+ }
+
+ uint64_t SectionAddress = SecI->getAddress();
+ Result = Address - SectionAddress;
+ return object_error::success;
}
-ObjectImage *RuntimeDyldImpl::loadObject(ObjectBuffer *InputBuffer) {
+std::pair<unsigned, unsigned>
+RuntimeDyldImpl::loadObjectImpl(const object::ObjectFile &Obj) {
MutexGuard locked(lock);
- OwningPtr<ObjectImage> obj(createObjectImage(InputBuffer));
- if (!obj)
- report_fatal_error("Unable to create object image from memory buffer!");
+ // Grab the first Section ID. We'll use this later to construct the underlying
+ // range for the returned LoadedObjectInfo.
+ unsigned SectionsAddedBeginIdx = Sections.size();
// Save information about our target
- Arch = (Triple::ArchType)obj->getArch();
- IsTargetLittleEndian = obj->getObjectFile()->isLittleEndian();
+ Arch = (Triple::ArchType)Obj.getArch();
+ IsTargetLittleEndian = Obj.isLittleEndian();
+
+ // Compute the memory size required to load all sections to be loaded
+ // and pass this information to the memory manager
+ if (MemMgr->needsToReserveAllocationSpace()) {
+ uint64_t CodeSize = 0, DataSizeRO = 0, DataSizeRW = 0;
+ computeTotalAllocSize(Obj, CodeSize, DataSizeRO, DataSizeRW);
+ MemMgr->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
+ }
- // Symbols found in this object
- StringMap<SymbolLoc> LocalSymbols;
// Used sections from the object file
ObjSectionToIDMap LocalSections;
// Common symbols requiring allocation, with their sizes and alignments
- CommonSymbolMap CommonSymbols;
- // Maximum required total memory to allocate all common symbols
- uint64_t CommonSize = 0;
+ CommonSymbolList CommonSymbols;
- error_code err;
// Parse symbols
DEBUG(dbgs() << "Parse symbols:\n");
- for (symbol_iterator i = obj->begin_symbols(), e = obj->end_symbols();
- i != e; i.increment(err)) {
- Check(err);
- object::SymbolRef::Type SymType;
- StringRef Name;
- Check(i->getType(SymType));
- Check(i->getName(Name));
+ for (symbol_iterator I = Obj.symbol_begin(), E = Obj.symbol_end(); I != E;
+ ++I) {
+ uint32_t Flags = I->getFlags();
- uint32_t flags;
- Check(i->getFlags(flags));
+ bool IsCommon = Flags & SymbolRef::SF_Common;
+ if (IsCommon)
+ CommonSymbols.push_back(*I);
+ else {
+ object::SymbolRef::Type SymType;
+ Check(I->getType(SymType));
- bool isCommon = flags & SymbolRef::SF_Common;
- if (isCommon) {
- // Add the common symbols to a list. We'll allocate them all below.
- uint32_t Align;
- Check(i->getAlignment(Align));
- uint64_t Size = 0;
- Check(i->getSize(Size));
- CommonSize += Size + Align;
- CommonSymbols[*i] = CommonSymbolInfo(Size, Align);
- } else {
if (SymType == object::SymbolRef::ST_Function ||
SymType == object::SymbolRef::ST_Data ||
SymType == object::SymbolRef::ST_Unknown) {
- uint64_t FileOffset;
+
+ StringRef Name;
+ uint64_t SectOffset;
+ Check(I->getName(Name));
+ Check(getOffset(*I, SectOffset));
+ section_iterator SI = Obj.section_end();
+ Check(I->getSection(SI));
+ if (SI == Obj.section_end())
+ continue;
StringRef SectionData;
- bool IsCode;
- section_iterator si = obj->end_sections();
- Check(i->getFileOffset(FileOffset));
- Check(i->getSection(si));
- if (si == obj->end_sections()) continue;
- Check(si->getContents(SectionData));
- Check(si->isText(IsCode));
- const uint8_t* SymPtr = (const uint8_t*)InputBuffer->getBufferStart() +
- (uintptr_t)FileOffset;
- uintptr_t SectOffset = (uintptr_t)(SymPtr -
- (const uint8_t*)SectionData.begin());
- unsigned SectionID = findOrEmitSection(*obj, *si, IsCode, LocalSections);
- LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
- DEBUG(dbgs() << "\tFileOffset: " << format("%p", (uintptr_t)FileOffset)
- << " flags: " << flags
- << " SID: " << SectionID
- << " Offset: " << format("%p", SectOffset));
- GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
+ Check(SI->getContents(SectionData));
+ bool IsCode = SI->isText();
+ unsigned SectionID =
+ findOrEmitSection(Obj, *SI, IsCode, LocalSections);
+ DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name
+ << " SID: " << SectionID << " Offset: "
+ << format("%p", (uintptr_t)SectOffset)
+ << " flags: " << Flags << "\n");
+ SymbolInfo::Visibility Vis =
+ (Flags & SymbolRef::SF_Exported) ?
+ SymbolInfo::Default : SymbolInfo::Hidden;
+ GlobalSymbolTable[Name] = SymbolInfo(SectionID, SectOffset, Vis);
}
}
- DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
}
// Allocate common symbols
- if (CommonSize != 0)
- emitCommonSymbols(*obj, CommonSymbols, CommonSize, LocalSymbols);
+ emitCommonSymbols(Obj, CommonSymbols);
// Parse and process relocations
DEBUG(dbgs() << "Parse relocations:\n");
- for (section_iterator si = obj->begin_sections(),
- se = obj->end_sections(); si != se; si.increment(err)) {
- Check(err);
- bool isFirstRelocation = true;
+ for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
+ SI != SE; ++SI) {
unsigned SectionID = 0;
StubMap Stubs;
- section_iterator RelocatedSection = si->getRelocatedSection();
-
- for (relocation_iterator i = si->begin_relocations(),
- e = si->end_relocations(); i != e; i.increment(err)) {
- Check(err);
-
- // If it's the first relocation in this section, find its SectionID
- if (isFirstRelocation) {
- SectionID =
- findOrEmitSection(*obj, *RelocatedSection, true, LocalSections);
- DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
- isFirstRelocation = false;
+ section_iterator RelocatedSection = SI->getRelocatedSection();
+
+ relocation_iterator I = SI->relocation_begin();
+ relocation_iterator E = SI->relocation_end();
+
+ if (I == E && !ProcessAllSections)
+ continue;
+
+ bool IsCode = RelocatedSection->isText();
+ SectionID =
+ findOrEmitSection(Obj, *RelocatedSection, IsCode, LocalSections);
+ DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
+
+ for (; I != E;)
+ I = processRelocationRef(SectionID, I, Obj, LocalSections, Stubs);
+
+ // If there is an attached checker, notify it about the stubs for this
+ // section so that they can be verified.
+ if (Checker)
+ Checker->registerStubMap(Obj.getFileName(), SectionID, Stubs);
+ }
+
+ // Give the subclasses a chance to tie-up any loose ends.
+ finalizeLoad(Obj, LocalSections);
+
+ unsigned SectionsAddedEndIdx = Sections.size();
+
+ return std::make_pair(SectionsAddedBeginIdx, SectionsAddedEndIdx);
+}
+
+// A helper method for computeTotalAllocSize.
+// Computes the memory size required to allocate sections with the given sizes,
+// assuming that all sections are allocated with the given alignment
+static uint64_t
+computeAllocationSizeForSections(std::vector<uint64_t> &SectionSizes,
+ uint64_t Alignment) {
+ uint64_t TotalSize = 0;
+ for (size_t Idx = 0, Cnt = SectionSizes.size(); Idx < Cnt; Idx++) {
+ uint64_t AlignedSize =
+ (SectionSizes[Idx] + Alignment - 1) / Alignment * Alignment;
+ TotalSize += AlignedSize;
+ }
+ return TotalSize;
+}
+
+static bool isRequiredForExecution(const SectionRef &Section) {
+ const ObjectFile *Obj = Section.getObject();
+ if (auto *ELFObj = dyn_cast<object::ELFObjectFileBase>(Obj))
+ return ELFObj->getSectionFlags(Section) & ELF::SHF_ALLOC;
+ assert(isa<MachOObjectFile>(Obj));
+ return true;
+ }
+
+static bool isReadOnlyData(const SectionRef &Section) {
+ const ObjectFile *Obj = Section.getObject();
+ if (auto *ELFObj = dyn_cast<object::ELFObjectFileBase>(Obj))
+ return !(ELFObj->getSectionFlags(Section) &
+ (ELF::SHF_WRITE | ELF::SHF_EXECINSTR));
+ assert(isa<MachOObjectFile>(Obj));
+ return false;
+}
+
+static bool isZeroInit(const SectionRef &Section) {
+ const ObjectFile *Obj = Section.getObject();
+ if (auto *ELFObj = dyn_cast<object::ELFObjectFileBase>(Obj))
+ return ELFObj->getSectionType(Section) == ELF::SHT_NOBITS;
+
+ auto *MachO = cast<MachOObjectFile>(Obj);
+ unsigned SectionType = MachO->getSectionType(Section);
+ return SectionType == MachO::S_ZEROFILL ||
+ SectionType == MachO::S_GB_ZEROFILL;
+}
+
+// Compute an upper bound of the memory size that is required to load all
+// sections
+void RuntimeDyldImpl::computeTotalAllocSize(const ObjectFile &Obj,
+ uint64_t &CodeSize,
+ uint64_t &DataSizeRO,
+ uint64_t &DataSizeRW) {
+ // Compute the size of all sections required for execution
+ std::vector<uint64_t> CodeSectionSizes;
+ std::vector<uint64_t> ROSectionSizes;
+ std::vector<uint64_t> RWSectionSizes;
+ uint64_t MaxAlignment = sizeof(void *);
+
+ // Collect sizes of all sections to be loaded;
+ // also determine the max alignment of all sections
+ for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
+ SI != SE; ++SI) {
+ const SectionRef &Section = *SI;
+
+ bool IsRequired = isRequiredForExecution(Section);
+
+ // Consider only the sections that are required to be loaded for execution
+ if (IsRequired) {
+ StringRef Name;
+ uint64_t DataSize = Section.getSize();
+ uint64_t Alignment64 = Section.getAlignment();
+ bool IsCode = Section.isText();
+ bool IsReadOnly = isReadOnlyData(Section);
+ Check(Section.getName(Name));
+ unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
+
+ uint64_t StubBufSize = computeSectionStubBufSize(Obj, Section);
+ uint64_t SectionSize = DataSize + StubBufSize;
+
+ // The .eh_frame section (at least on Linux) needs an extra four bytes
+ // padded
+ // with zeroes added at the end. For MachO objects, this section has a
+ // slightly different name, so this won't have any effect for MachO
+ // objects.
+ if (Name == ".eh_frame")
+ SectionSize += 4;
+
+ if (SectionSize > 0) {
+ // save the total size of the section
+ if (IsCode) {
+ CodeSectionSizes.push_back(SectionSize);
+ } else if (IsReadOnly) {
+ ROSectionSizes.push_back(SectionSize);
+ } else {
+ RWSectionSizes.push_back(SectionSize);
+ }
+ // update the max alignment
+ if (Alignment > MaxAlignment) {
+ MaxAlignment = Alignment;
+ }
}
+ }
+ }
- processRelocationRef(SectionID, *i, *obj, LocalSections, LocalSymbols,
- Stubs);
+ // Compute the size of all common symbols
+ uint64_t CommonSize = 0;
+ for (symbol_iterator I = Obj.symbol_begin(), E = Obj.symbol_end(); I != E;
+ ++I) {
+ uint32_t Flags = I->getFlags();
+ if (Flags & SymbolRef::SF_Common) {
+ // Add the common symbols to a list. We'll allocate them all below.
+ uint64_t Size = 0;
+ Check(I->getSize(Size));
+ CommonSize += Size;
}
}
+ if (CommonSize != 0) {
+ RWSectionSizes.push_back(CommonSize);
+ }
- // Give the subclasses a chance to tie-up any loose ends.
- finalizeLoad(LocalSections);
+ // Compute the required allocation space for each different type of sections
+ // (code, read-only data, read-write data) assuming that all sections are
+ // allocated with the max alignment. Note that we cannot compute with the
+ // individual alignments of the sections, because then the required size
+ // depends on the order, in which the sections are allocated.
+ CodeSize = computeAllocationSizeForSections(CodeSectionSizes, MaxAlignment);
+ DataSizeRO = computeAllocationSizeForSections(ROSectionSizes, MaxAlignment);
+ DataSizeRW = computeAllocationSizeForSections(RWSectionSizes, MaxAlignment);
+}
- return obj.take();
+// compute stub buffer size for the given section
+unsigned RuntimeDyldImpl::computeSectionStubBufSize(const ObjectFile &Obj,
+ const SectionRef &Section) {
+ unsigned StubSize = getMaxStubSize();
+ if (StubSize == 0) {
+ return 0;
+ }
+ // FIXME: this is an inefficient way to handle this. We should computed the
+ // necessary section allocation size in loadObject by walking all the sections
+ // once.
+ unsigned StubBufSize = 0;
+ for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
+ SI != SE; ++SI) {
+ section_iterator RelSecI = SI->getRelocatedSection();
+ if (!(RelSecI == Section))
+ continue;
+
+ for (const RelocationRef &Reloc : SI->relocations()) {
+ (void)Reloc;
+ StubBufSize += StubSize;
+ }
+ }
+
+ // Get section data size and alignment
+ uint64_t DataSize = Section.getSize();
+ uint64_t Alignment64 = Section.getAlignment();
+
+ // Add stubbuf size alignment
+ unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
+ unsigned StubAlignment = getStubAlignment();
+ unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
+ if (StubAlignment > EndAlignment)
+ StubBufSize += StubAlignment - EndAlignment;
+ return StubBufSize;
+}
+
+uint64_t RuntimeDyldImpl::readBytesUnaligned(uint8_t *Src,
+ unsigned Size) const {
+ uint64_t Result = 0;
+ if (IsTargetLittleEndian) {
+ Src += Size - 1;
+ while (Size--)
+ Result = (Result << 8) | *Src--;
+ } else
+ while (Size--)
+ Result = (Result << 8) | *Src++;
+
+ return Result;
+}
+
+void RuntimeDyldImpl::writeBytesUnaligned(uint64_t Value, uint8_t *Dst,
+ unsigned Size) const {
+ if (IsTargetLittleEndian) {
+ while (Size--) {
+ *Dst++ = Value & 0xFF;
+ Value >>= 8;
+ }
+ } else {
+ Dst += Size - 1;
+ while (Size--) {
+ *Dst-- = Value & 0xFF;
+ Value >>= 8;
+ }
+ }
}
-void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
- const CommonSymbolMap &CommonSymbols,
- uint64_t TotalSize,
- SymbolTableMap &SymbolTable) {
+void RuntimeDyldImpl::emitCommonSymbols(const ObjectFile &Obj,
+ CommonSymbolList &CommonSymbols) {
+ if (CommonSymbols.empty())
+ return;
+
+ uint64_t CommonSize = 0;
+ CommonSymbolList SymbolsToAllocate;
+
+ DEBUG(dbgs() << "Processing common symbols...\n");
+
+ for (const auto &Sym : CommonSymbols) {
+ StringRef Name;
+ Check(Sym.getName(Name));
+
+ assert((GlobalSymbolTable.find(Name) == GlobalSymbolTable.end()) &&
+ "Common symbol in global symbol table.");
+
+ // Skip common symbols already elsewhere.
+ if (GlobalSymbolTable.count(Name)) {
+ DEBUG(dbgs() << "\tSkipping already emitted common symbol '" << Name
+ << "'\n");
+ continue;
+ }
+
+ uint32_t Align = 0;
+ uint64_t Size = 0;
+ Check(Sym.getAlignment(Align));
+ Check(Sym.getSize(Size));
+
+ CommonSize += Align + Size;
+ SymbolsToAllocate.push_back(Sym);
+ }
+
// Allocate memory for the section
unsigned SectionID = Sections.size();
- uint8_t *Addr = MemMgr->allocateDataSection(
- TotalSize, sizeof(void*), SectionID, StringRef(), false);
+ uint8_t *Addr = MemMgr->allocateDataSection(CommonSize, sizeof(void *),
+ SectionID, StringRef(), false);
if (!Addr)
report_fatal_error("Unable to allocate memory for common symbols!");
uint64_t Offset = 0;
- Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, 0));
- memset(Addr, 0, TotalSize);
+ Sections.push_back(SectionEntry("<common symbols>", Addr, CommonSize, 0));
+ memset(Addr, 0, CommonSize);
- DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID
- << " new addr: " << format("%p", Addr)
- << " DataSize: " << TotalSize
- << "\n");
+ DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID << " new addr: "
+ << format("%p", Addr) << " DataSize: " << CommonSize << "\n");
// Assign the address of each symbol
- for (CommonSymbolMap::const_iterator it = CommonSymbols.begin(),
- itEnd = CommonSymbols.end(); it != itEnd; it++) {
- uint64_t Size = it->second.first;
- uint64_t Align = it->second.second;
+ for (auto &Sym : SymbolsToAllocate) {
+ uint32_t Align;
+ uint64_t Size;
StringRef Name;
- it->first.getName(Name);
+ Check(Sym.getAlignment(Align));
+ Check(Sym.getSize(Size));
+ Check(Sym.getName(Name));
if (Align) {
// This symbol has an alignment requirement.
uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align);
Addr += AlignOffset;
Offset += AlignOffset;
- DEBUG(dbgs() << "Allocating common symbol " << Name << " address " <<
- format("%p\n", Addr));
}
- Obj.updateSymbolAddress(it->first, (uint64_t)Addr);
- SymbolTable[Name.data()] = SymbolLoc(SectionID, Offset);
+ uint32_t Flags = Sym.getFlags();
+ SymbolInfo::Visibility Vis =
+ (Flags & SymbolRef::SF_Exported) ?
+ SymbolInfo::Default : SymbolInfo::Hidden;
+ DEBUG(dbgs() << "Allocating common symbol " << Name << " address "
+ << format("%p", Addr) << "\n");
+ GlobalSymbolTable[Name] = SymbolInfo(SectionID, Offset, Vis);
Offset += Size;
Addr += Size;
}
}
-unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
- const SectionRef &Section,
- bool IsCode) {
-
- unsigned StubBufSize = 0,
- StubSize = getMaxStubSize();
- error_code err;
- const ObjectFile *ObjFile = Obj.getObjectFile();
- // FIXME: this is an inefficient way to handle this. We should computed the
- // necessary section allocation size in loadObject by walking all the sections
- // once.
- if (StubSize > 0) {
- for (section_iterator SI = ObjFile->begin_sections(),
- SE = ObjFile->end_sections();
- SI != SE; SI.increment(err), Check(err)) {
- section_iterator RelSecI = SI->getRelocatedSection();
- if (!(RelSecI == Section))
- continue;
-
- for (relocation_iterator I = SI->begin_relocations(),
- E = SI->end_relocations(); I != E; I.increment(err), Check(err)) {
- StubBufSize += StubSize;
- }
- }
- }
+unsigned RuntimeDyldImpl::emitSection(const ObjectFile &Obj,
+ const SectionRef &Section, bool IsCode) {
StringRef data;
- uint64_t Alignment64;
Check(Section.getContents(data));
- Check(Section.getAlignment(Alignment64));
+ uint64_t Alignment64 = Section.getAlignment();
unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
- bool IsRequired;
- bool IsVirtual;
- bool IsZeroInit;
- bool IsReadOnly;
- uint64_t DataSize;
unsigned PaddingSize = 0;
+ unsigned StubBufSize = 0;
StringRef Name;
- Check(Section.isRequiredForExecution(IsRequired));
- Check(Section.isVirtual(IsVirtual));
- Check(Section.isZeroInit(IsZeroInit));
- Check(Section.isReadOnlyData(IsReadOnly));
- Check(Section.getSize(DataSize));
+ bool IsRequired = isRequiredForExecution(Section);
+ bool IsVirtual = Section.isVirtual();
+ bool IsZeroInit = isZeroInit(Section);
+ bool IsReadOnly = isReadOnlyData(Section);
+ uint64_t DataSize = Section.getSize();
Check(Section.getName(Name));
- if (StubSize > 0) {
- unsigned StubAlignment = getStubAlignment();
- unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
- if (StubAlignment > EndAlignment)
- StubBufSize += StubAlignment - EndAlignment;
- }
+
+ StubBufSize = computeSectionStubBufSize(Obj, Section);
// The .eh_frame section (at least on Linux) needs an extra four bytes padded
// with zeroes added at the end. For MachO objects, this section has a
if (Name == ".eh_frame")
PaddingSize = 4;
- unsigned Allocate;
+ uintptr_t Allocate;
unsigned SectionID = Sections.size();
uint8_t *Addr;
- const char *pData = 0;
+ const char *pData = nullptr;
// Some sections, such as debug info, don't need to be loaded for execution.
// Leave those where they are.
if (IsRequired) {
Allocate = DataSize + PaddingSize + StubBufSize;
- Addr = IsCode
- ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID, Name)
- : MemMgr->allocateDataSection(Allocate, Alignment, SectionID, Name,
- IsReadOnly);
+ Addr = IsCode ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID,
+ Name)
+ : MemMgr->allocateDataSection(Allocate, Alignment, SectionID,
+ Name, IsReadOnly);
if (!Addr)
report_fatal_error("Unable to allocate section memory!");
DataSize += PaddingSize;
}
- DEBUG(dbgs() << "emitSection SectionID: " << SectionID
- << " Name: " << Name
+ DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
<< " obj addr: " << format("%p", pData)
<< " new addr: " << format("%p", Addr)
- << " DataSize: " << DataSize
- << " StubBufSize: " << StubBufSize
- << " Allocate: " << Allocate
- << "\n");
- Obj.updateSectionAddress(Section, (uint64_t)Addr);
- }
- else {
+ << " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
+ << " Allocate: " << Allocate << "\n");
+ } else {
// Even if we didn't load the section, we need to record an entry for it
// to handle later processing (and by 'handle' I mean don't do anything
// with these sections).
Allocate = 0;
- Addr = 0;
- DEBUG(dbgs() << "emitSection SectionID: " << SectionID
- << " Name: " << Name
- << " obj addr: " << format("%p", data.data())
- << " new addr: 0"
- << " DataSize: " << DataSize
- << " StubBufSize: " << StubBufSize
- << " Allocate: " << Allocate
- << "\n");
+ Addr = nullptr;
+ DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
+ << " obj addr: " << format("%p", data.data()) << " new addr: 0"
+ << " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
+ << " Allocate: " << Allocate << "\n");
}
Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
+
+ if (Checker)
+ Checker->registerSection(Obj.getFileName(), SectionID);
+
return SectionID;
}
-unsigned RuntimeDyldImpl::findOrEmitSection(ObjectImage &Obj,
+unsigned RuntimeDyldImpl::findOrEmitSection(const ObjectFile &Obj,
const SectionRef &Section,
bool IsCode,
ObjSectionToIDMap &LocalSections) {
// Relocation by symbol. If the symbol is found in the global symbol table,
// create an appropriate section relocation. Otherwise, add it to
// ExternalSymbolRelocations.
- SymbolTableMap::const_iterator Loc =
- GlobalSymbolTable.find(SymbolName);
+ RTDyldSymbolTable::const_iterator Loc = GlobalSymbolTable.find(SymbolName);
if (Loc == GlobalSymbolTable.end()) {
ExternalSymbolRelocations[SymbolName].push_back(RE);
} else {
// Copy the RE since we want to modify its addend.
RelocationEntry RECopy = RE;
- RECopy.Addend += Loc->second.second;
- Relocations[Loc->second.first].push_back(RECopy);
+ const auto &SymInfo = Loc->second;
+ RECopy.Addend += SymInfo.getOffset();
+ Relocations[SymInfo.getSectionID()].push_back(RECopy);
}
}
-uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
- if (Arch == Triple::aarch64) {
+uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr,
+ unsigned AbiVariant) {
+ if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be) {
// This stub has to be able to access the full address space,
// since symbol lookup won't necessarily find a handy, in-range,
// PLT stub for functions which could be anywhere.
- uint32_t *StubAddr = (uint32_t*)Addr;
-
// Stub can use ip0 (== x16) to calculate address
- *StubAddr = 0xd2e00010; // movz ip0, #:abs_g3:<addr>
- StubAddr++;
- *StubAddr = 0xf2c00010; // movk ip0, #:abs_g2_nc:<addr>
- StubAddr++;
- *StubAddr = 0xf2a00010; // movk ip0, #:abs_g1_nc:<addr>
- StubAddr++;
- *StubAddr = 0xf2800010; // movk ip0, #:abs_g0_nc:<addr>
- StubAddr++;
- *StubAddr = 0xd61f0200; // br ip0
+ writeBytesUnaligned(0xd2e00010, Addr, 4); // movz ip0, #:abs_g3:<addr>
+ writeBytesUnaligned(0xf2c00010, Addr+4, 4); // movk ip0, #:abs_g2_nc:<addr>
+ writeBytesUnaligned(0xf2a00010, Addr+8, 4); // movk ip0, #:abs_g1_nc:<addr>
+ writeBytesUnaligned(0xf2800010, Addr+12, 4); // movk ip0, #:abs_g0_nc:<addr>
+ writeBytesUnaligned(0xd61f0200, Addr+16, 4); // br ip0
return Addr;
- } else if (Arch == Triple::arm) {
+ } else if (Arch == Triple::arm || Arch == Triple::armeb) {
// TODO: There is only ARM far stub now. We should add the Thumb stub,
// and stubs for branches Thumb - ARM and ARM - Thumb.
- uint32_t *StubAddr = (uint32_t*)Addr;
- *StubAddr = 0xe51ff004; // ldr pc,<label>
- return (uint8_t*)++StubAddr;
+ writeBytesUnaligned(0xe51ff004, Addr, 4); // ldr pc,<label>
+ return Addr + 4;
} else if (Arch == Triple::mipsel || Arch == Triple::mips) {
- uint32_t *StubAddr = (uint32_t*)Addr;
// 0: 3c190000 lui t9,%hi(addr).
// 4: 27390000 addiu t9,t9,%lo(addr).
// 8: 03200008 jr t9.
const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
const unsigned JrT9Instr = 0x03200008, NopInstr = 0x0;
- *StubAddr = LuiT9Instr;
- StubAddr++;
- *StubAddr = AdduiT9Instr;
- StubAddr++;
- *StubAddr = JrT9Instr;
- StubAddr++;
- *StubAddr = NopInstr;
+ writeBytesUnaligned(LuiT9Instr, Addr, 4);
+ writeBytesUnaligned(AdduiT9Instr, Addr+4, 4);
+ writeBytesUnaligned(JrT9Instr, Addr+8, 4);
+ writeBytesUnaligned(NopInstr, Addr+12, 4);
return Addr;
} else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
- // PowerPC64 stub: the address points to a function descriptor
- // instead of the function itself. Load the function address
- // on r11 and sets it to control register. Also loads the function
- // TOC in r2 and environment pointer to r11.
+ // Depending on which version of the ELF ABI is in use, we need to
+ // generate one of two variants of the stub. They both start with
+ // the same sequence to load the target address into r12.
writeInt32BE(Addr, 0x3D800000); // lis r12, highest(addr)
writeInt32BE(Addr+4, 0x618C0000); // ori r12, higher(addr)
writeInt32BE(Addr+8, 0x798C07C6); // sldi r12, r12, 32
writeInt32BE(Addr+12, 0x658C0000); // oris r12, r12, h(addr)
writeInt32BE(Addr+16, 0x618C0000); // ori r12, r12, l(addr)
- writeInt32BE(Addr+20, 0xF8410028); // std r2, 40(r1)
- writeInt32BE(Addr+24, 0xE96C0000); // ld r11, 0(r12)
- writeInt32BE(Addr+28, 0xE84C0008); // ld r2, 0(r12)
- writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
- writeInt32BE(Addr+36, 0xE96C0010); // ld r11, 16(r2)
- writeInt32BE(Addr+40, 0x4E800420); // bctr
-
+ if (AbiVariant == 2) {
+ // PowerPC64 stub ELFv2 ABI: The address points to the function itself.
+ // The address is already in r12 as required by the ABI. Branch to it.
+ writeInt32BE(Addr+20, 0xF8410018); // std r2, 24(r1)
+ writeInt32BE(Addr+24, 0x7D8903A6); // mtctr r12
+ writeInt32BE(Addr+28, 0x4E800420); // bctr
+ } else {
+ // PowerPC64 stub ELFv1 ABI: The address points to a function descriptor.
+ // Load the function address on r11 and sets it to control register. Also
+ // loads the function TOC in r2 and environment pointer to r11.
+ writeInt32BE(Addr+20, 0xF8410028); // std r2, 40(r1)
+ writeInt32BE(Addr+24, 0xE96C0000); // ld r11, 0(r12)
+ writeInt32BE(Addr+28, 0xE84C0008); // ld r2, 0(r12)
+ writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
+ writeInt32BE(Addr+36, 0xE96C0010); // ld r11, 16(r2)
+ writeInt32BE(Addr+40, 0x4E800420); // bctr
+ }
return Addr;
} else if (Arch == Triple::systemz) {
writeInt16BE(Addr, 0xC418); // lgrl %r1,.+8
*Addr = 0xFF; // jmp
*(Addr+1) = 0x25; // rip
// 32-bit PC-relative address of the GOT entry will be stored at Addr+2
+ } else if (Arch == Triple::x86) {
+ *Addr = 0xE9; // 32-bit pc-relative jump.
}
return Addr;
}
// Addr is a uint64_t because we can't assume the pointer width
// of the target is the same as that of the host. Just use a generic
// "big enough" type.
+ DEBUG(dbgs() << "Reassigning address for section "
+ << SectionID << " (" << Sections[SectionID].Name << "): "
+ << format("0x%016" PRIx64, Sections[SectionID].LoadAddress) << " -> "
+ << format("0x%016" PRIx64, Addr) << "\n");
Sections[SectionID].LoadAddress = Addr;
}
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
const RelocationEntry &RE = Relocs[i];
// Ignore relocations for sections that were not loaded
- if (Sections[RE.SectionID].Address == 0)
+ if (Sections[RE.SectionID].Address == nullptr)
continue;
resolveRelocation(RE, Value);
}
}
void RuntimeDyldImpl::resolveExternalSymbols() {
- while(!ExternalSymbolRelocations.empty()) {
+ while (!ExternalSymbolRelocations.empty()) {
StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();
StringRef Name = i->first();
if (Name.size() == 0) {
// This is an absolute symbol, use an address of zero.
- DEBUG(dbgs() << "Resolving absolute relocations." << "\n");
+ DEBUG(dbgs() << "Resolving absolute relocations."
+ << "\n");
RelocationList &Relocs = i->second;
resolveRelocationList(Relocs, 0);
} else {
uint64_t Addr = 0;
- SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
+ RTDyldSymbolTable::const_iterator Loc = GlobalSymbolTable.find(Name);
if (Loc == GlobalSymbolTable.end()) {
- // This is an external symbol, try to get its address from
- // MemoryManager.
- Addr = MemMgr->getSymbolAddress(Name.data());
- // The call to getSymbolAddress may have caused additional modules to
- // be loaded, which may have added new entries to the
- // ExternalSymbolRelocations map. Consquently, we need to update our
- // iterator. This is also why retrieval of the relocation list
- // associated with this symbol is deferred until below this point.
- // New entries may have been added to the relocation list.
- i = ExternalSymbolRelocations.find(Name);
+ // This is an external symbol, try to get its address from
+ // MemoryManager.
+ Addr = MemMgr->getSymbolAddress(Name.data());
+ // The call to getSymbolAddress may have caused additional modules to
+ // be loaded, which may have added new entries to the
+ // ExternalSymbolRelocations map. Consquently, we need to update our
+ // iterator. This is also why retrieval of the relocation list
+ // associated with this symbol is deferred until below this point.
+ // New entries may have been added to the relocation list.
+ i = ExternalSymbolRelocations.find(Name);
} else {
// We found the symbol in our global table. It was probably in a
// Module that we loaded previously.
- SymbolLoc SymLoc = Loc->second;
- Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
+ const auto &SymInfo = Loc->second;
+ Addr = getSectionLoadAddress(SymInfo.getSectionID()) +
+ SymInfo.getOffset();
}
// FIXME: Implement error handling that doesn't kill the host program!
if (!Addr)
report_fatal_error("Program used external function '" + Name +
- "' which could not be resolved!");
+ "' which could not be resolved!");
updateGOTEntries(Name, Addr);
- DEBUG(dbgs() << "Resolving relocations Name: " << Name
- << "\t" << format("0x%lx", Addr)
- << "\n");
+ DEBUG(dbgs() << "Resolving relocations Name: " << Name << "\t"
+ << format("0x%lx", Addr) << "\n");
// This list may have been updated when we called getSymbolAddress, so
// don't change this code to get the list earlier.
RelocationList &Relocs = i->second;
}
}
-
//===----------------------------------------------------------------------===//
// RuntimeDyld class implementation
+
+uint64_t RuntimeDyld::LoadedObjectInfo::getSectionLoadAddress(
+ StringRef SectionName) const {
+ for (unsigned I = BeginIdx; I != EndIdx; ++I)
+ if (RTDyld.Sections[I].Name == SectionName)
+ return RTDyld.Sections[I].LoadAddress;
+
+ return 0;
+}
+
RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {
// FIXME: There's a potential issue lurking here if a single instance of
// RuntimeDyld is used to load multiple objects. The current implementation
// though the public class spawns a new 'impl' instance for each load,
// they share a single memory manager. This can become a problem when page
// permissions are applied.
- Dyld = 0;
+ Dyld = nullptr;
MM = mm;
+ ProcessAllSections = false;
+ Checker = nullptr;
+}
+
+RuntimeDyld::~RuntimeDyld() {}
+
+static std::unique_ptr<RuntimeDyldELF>
+createRuntimeDyldELF(RTDyldMemoryManager *MM, bool ProcessAllSections,
+ RuntimeDyldCheckerImpl *Checker) {
+ std::unique_ptr<RuntimeDyldELF> Dyld(new RuntimeDyldELF(MM));
+ Dyld->setProcessAllSections(ProcessAllSections);
+ Dyld->setRuntimeDyldChecker(Checker);
+ return Dyld;
}
-RuntimeDyld::~RuntimeDyld() {
- delete Dyld;
+static std::unique_ptr<RuntimeDyldMachO>
+createRuntimeDyldMachO(Triple::ArchType Arch, RTDyldMemoryManager *MM,
+ bool ProcessAllSections, RuntimeDyldCheckerImpl *Checker) {
+ std::unique_ptr<RuntimeDyldMachO> Dyld(RuntimeDyldMachO::create(Arch, MM));
+ Dyld->setProcessAllSections(ProcessAllSections);
+ Dyld->setRuntimeDyldChecker(Checker);
+ return Dyld;
}
-ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
+std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
+RuntimeDyld::loadObject(const ObjectFile &Obj) {
if (!Dyld) {
- sys::fs::file_magic Type =
- sys::fs::identify_magic(InputBuffer->getBuffer());
- switch (Type) {
- case sys::fs::file_magic::elf_relocatable:
- case sys::fs::file_magic::elf_executable:
- case sys::fs::file_magic::elf_shared_object:
- case sys::fs::file_magic::elf_core:
- Dyld = new RuntimeDyldELF(MM);
- break;
- case sys::fs::file_magic::macho_object:
- case sys::fs::file_magic::macho_executable:
- case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
- case sys::fs::file_magic::macho_core:
- case sys::fs::file_magic::macho_preload_executable:
- case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
- case sys::fs::file_magic::macho_dynamic_linker:
- case sys::fs::file_magic::macho_bundle:
- case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
- case sys::fs::file_magic::macho_dsym_companion:
- Dyld = new RuntimeDyldMachO(MM);
- break;
- case sys::fs::file_magic::unknown:
- case sys::fs::file_magic::bitcode:
- case sys::fs::file_magic::archive:
- case sys::fs::file_magic::coff_object:
- case sys::fs::file_magic::coff_import_library:
- case sys::fs::file_magic::pecoff_executable:
- case sys::fs::file_magic::macho_universal_binary:
- case sys::fs::file_magic::windows_resource:
- report_fatal_error("Incompatible object format!");
- }
- } else {
- if (!Dyld->isCompatibleFormat(InputBuffer))
+ if (Obj.isELF())
+ Dyld = createRuntimeDyldELF(MM, ProcessAllSections, Checker);
+ else if (Obj.isMachO())
+ Dyld = createRuntimeDyldMachO(
+ static_cast<Triple::ArchType>(Obj.getArch()), MM,
+ ProcessAllSections, Checker);
+ else
report_fatal_error("Incompatible object format!");
}
- return Dyld->loadObject(InputBuffer);
+ if (!Dyld->isCompatibleFile(Obj))
+ report_fatal_error("Incompatible object format!");
+
+ return Dyld->loadObject(Obj);
}
-void *RuntimeDyld::getSymbolAddress(StringRef Name) {
+void *RuntimeDyld::getSymbolAddress(StringRef Name) const {
if (!Dyld)
- return NULL;
+ return nullptr;
return Dyld->getSymbolAddress(Name);
}
-uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
+uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) const {
if (!Dyld)
return 0;
return Dyld->getSymbolLoadAddress(Name);
}
-void RuntimeDyld::resolveRelocations() {
- Dyld->resolveRelocations();
+uint64_t RuntimeDyld::getExportedSymbolLoadAddress(StringRef Name) const {
+ if (!Dyld)
+ return 0;
+ return Dyld->getExportedSymbolLoadAddress(Name);
}
-void RuntimeDyld::reassignSectionAddress(unsigned SectionID,
- uint64_t Addr) {
+void RuntimeDyld::resolveRelocations() { Dyld->resolveRelocations(); }
+
+void RuntimeDyld::reassignSectionAddress(unsigned SectionID, uint64_t Addr) {
Dyld->reassignSectionAddress(SectionID, Addr);
}
Dyld->mapSectionAddress(LocalAddress, TargetAddress);
}
-StringRef RuntimeDyld::getErrorString() {
- return Dyld->getErrorString();
-}
+bool RuntimeDyld::hasError() { return Dyld->hasError(); }
+
+StringRef RuntimeDyld::getErrorString() { return Dyld->getErrorString(); }
void RuntimeDyld::registerEHFrames() {
if (Dyld)
projects / oota-llvm.git / blobdiff