//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "dyld"
-#include "RuntimeDyldImpl.h"
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
+#include "JITRegistrar.h"
+#include "ObjectImageCommon.h"
#include "RuntimeDyldELF.h"
+#include "RuntimeDyldImpl.h"
#include "RuntimeDyldMachO.h"
-#include "llvm/Support/Path.h"
+#include "llvm/Object/ELF.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/MutexGuard.h"
using namespace llvm;
using namespace llvm::object;
// Empty out-of-line virtual destructor as the key function.
-RTDyldMemoryManager::~RTDyldMemoryManager() {}
RuntimeDyldImpl::~RuntimeDyldImpl() {}
+// Pin the JITRegistrar's and ObjectImage*'s vtables to this file.
+void JITRegistrar::anchor() {}
+void ObjectImage::anchor() {}
+void ObjectImageCommon::anchor() {}
+
namespace llvm {
-namespace {
- // Helper for extensive error checking in debug builds.
- error_code Check(error_code Err) {
- if (Err) {
- report_fatal_error(Err.message());
- }
- return Err;
- }
-} // end anonymous namespace
+void RuntimeDyldImpl::registerEHFrames() {}
+
+void RuntimeDyldImpl::deregisterEHFrames() {}
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
+ MutexGuard locked(lock);
+
// First, resolve relocations associated with external symbols.
resolveExternalSymbols();
// Just iterate over the sections we have and resolve all the relocations
// in them. Gross overkill, but it gets the job done.
for (int i = 0, e = Sections.size(); i != e; ++i) {
- reassignSectionAddress(i, Sections[i].LoadAddress);
+ // The Section here (Sections[i]) refers to the section in which the
+ // 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");
+ resolveRelocationList(Relocations[i], Addr);
+ Relocations.erase(i);
}
}
void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
uint64_t TargetAddress) {
+ MutexGuard locked(lock);
for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
if (Sections[i].Address == LocalAddress) {
reassignSectionAddress(i, TargetAddress);
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(const MemoryBuffer *InputBuffer) {
- ObjectFile *ObjFile = ObjectFile::createObjectFile(const_cast<MemoryBuffer*>
- (InputBuffer));
- ObjectImage *Obj = new ObjectImage(ObjFile);
- return Obj;
+static error_code getOffset(const SymbolRef &Sym, uint64_t &Result) {
+ uint64_t Address;
+ if (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 (error_code EC = Sym.getSection(SecI))
+ return EC;
+
+ if (SecI == Obj->section_end()) {
+ Result = UnknownAddressOrSize;
+ return object_error::success;
+ }
+
+ uint64_t SectionAddress;
+ if (error_code EC = SecI->getAddress(SectionAddress))
+ return EC;
+
+ Result = Address - SectionAddress;
+ return object_error::success;
}
-bool RuntimeDyldImpl::loadObject(const MemoryBuffer *InputBuffer) {
- OwningPtr<ObjectImage> obj(createObjectImage(InputBuffer));
- if (!obj)
- report_fatal_error("Unable to create object image from memory buffer!");
+ObjectImage *RuntimeDyldImpl::loadObject(ObjectImage *InputObject) {
+ MutexGuard locked(lock);
+
+ std::unique_ptr<ObjectImage> Obj(InputObject);
+ if (!Obj)
+ return NULL;
+
+ // Save information about our target
+ Arch = (Triple::ArchType)Obj->getArch();
+ IsTargetLittleEndian = Obj->getObjectFile()->isLittleEndian();
- Arch = (Triple::ArchType)obj->getArch();
+ // 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, and the total size required to
- // allocate all common symbols.
+ // Common symbols requiring allocation, with their sizes and alignments
CommonSymbolMap CommonSymbols;
+ // Maximum required total memory to allocate all common symbols
uint64_t CommonSize = 0;
- 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);
+ for (symbol_iterator I = Obj->begin_symbols(), E = Obj->end_symbols(); I != E;
+ ++I) {
object::SymbolRef::Type SymType;
StringRef Name;
- Check(i->getType(SymType));
- Check(i->getName(Name));
+ Check(I->getType(SymType));
+ Check(I->getName(Name));
- uint32_t flags;
- Check(i->getFlags(flags));
+ uint32_t Flags = I->getFlags();
- bool isCommon = flags & SymbolRef::SF_Common;
- if (isCommon) {
+ 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;
- CommonSymbols[*i] = Size;
+ 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;
+ uint64_t SectOffset;
StringRef SectionData;
- section_iterator si = obj->end_sections();
- Check(i->getFileOffset(FileOffset));
- Check(i->getSection(si));
- if (si == obj->end_sections()) continue;
- Check(si->getContents(SectionData));
- const uint8_t* SymPtr = (const uint8_t*)InputBuffer->getBufferStart() +
- (uintptr_t)FileOffset;
- uintptr_t SectOffset = (uintptr_t)(SymPtr -
- (const uint8_t*)SectionData.begin());
+ bool IsCode;
+ section_iterator SI = Obj->end_sections();
+ Check(getOffset(*I, SectOffset));
+ Check(I->getSection(SI));
+ if (SI == Obj->end_sections())
+ continue;
+ Check(SI->getContents(SectionData));
+ Check(SI->isText(IsCode));
unsigned SectionID =
- findOrEmitSection(*obj,
- *si,
- SymType == object::SymbolRef::ST_Function,
- LocalSections);
+ 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));
- bool isGlobal = flags & SymbolRef::SF_Global;
- if (isGlobal)
- GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
+ DEBUG(dbgs() << "\tOffset: " << format("%p", (uintptr_t)SectOffset)
+ << " flags: " << Flags << " SID: " << SectionID);
+ GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
}
}
DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
// Allocate common symbols
if (CommonSize != 0)
- emitCommonSymbols(*obj, CommonSymbols, CommonSize, LocalSymbols);
+ emitCommonSymbols(*Obj, CommonSymbols, CommonSize, LocalSymbols);
// 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->begin_sections(), SE = Obj->end_sections();
+ SI != SE; ++SI) {
unsigned SectionID = 0;
StubMap Stubs;
+ section_iterator RelocatedSection = SI->getRelocatedSection();
+
+ relocation_iterator I = SI->relocation_begin();
+ relocation_iterator E = SI->relocation_end();
- for (relocation_iterator i = si->begin_relocations(),
- e = si->end_relocations(); i != e; i.increment(err)) {
- Check(err);
+ if (I == E && !ProcessAllSections)
+ continue;
- // If it's the first relocation in this section, find its SectionID
- if (isFirstRelocation) {
- SectionID = findOrEmitSection(*obj, *si, true, LocalSections);
- DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
- isFirstRelocation = false;
+ bool IsCode = false;
+ Check(RelocatedSection->isText(IsCode));
+ SectionID =
+ findOrEmitSection(*Obj, *RelocatedSection, IsCode, LocalSections);
+ DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
+
+ for (; I != E;)
+ I = processRelocationRef(SectionID, I, *Obj, LocalSections, LocalSymbols,
+ Stubs);
+ }
+
+ // Give the subclasses a chance to tie-up any loose ends.
+ finalizeLoad(LocalSections);
+
+ return Obj.release();
+}
+
+// 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;
+}
+
+// Compute an upper bound of the memory size that is required to load all
+// sections
+void RuntimeDyldImpl::computeTotalAllocSize(ObjectImage &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.begin_sections(), SE = Obj.end_sections();
+ SI != SE; ++SI) {
+ const SectionRef &Section = *SI;
+
+ bool IsRequired;
+ Check(Section.isRequiredForExecution(IsRequired));
+
+ // Consider only the sections that are required to be loaded for execution
+ if (IsRequired) {
+ uint64_t DataSize = 0;
+ uint64_t Alignment64 = 0;
+ bool IsCode = false;
+ bool IsReadOnly = false;
+ StringRef Name;
+ Check(Section.getSize(DataSize));
+ Check(Section.getAlignment(Alignment64));
+ Check(Section.isText(IsCode));
+ Check(Section.isReadOnlyData(IsReadOnly));
+ 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;
+ }
}
+ }
+ }
+
+ // Compute the size of all common symbols
+ uint64_t CommonSize = 0;
+ for (symbol_iterator I = Obj.begin_symbols(), E = Obj.end_symbols(); 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);
+ }
- ObjRelocationInfo RI;
- RI.SectionID = SectionID;
- Check(i->getAdditionalInfo(RI.AdditionalInfo));
- Check(i->getOffset(RI.Offset));
- Check(i->getSymbol(RI.Symbol));
- Check(i->getType(RI.Type));
+ // 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);
+}
- DEBUG(dbgs() << "\t\tAddend: " << RI.AdditionalInfo
- << " Offset: " << format("%p", (uintptr_t)RI.Offset)
- << " Type: " << (uint32_t)(RI.Type & 0xffffffffL)
- << "\n");
- processRelocationRef(RI, *obj, LocalSections, LocalSymbols, Stubs);
+// compute stub buffer size for the given section
+unsigned RuntimeDyldImpl::computeSectionStubBufSize(ObjectImage &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.begin_sections(), SE = Obj.end_sections();
+ SI != SE; ++SI) {
+ section_iterator RelSecI = SI->getRelocatedSection();
+ if (!(RelSecI == Section))
+ continue;
+
+ for (const RelocationRef &Reloc : SI->relocations()) {
+ (void)Reloc;
+ StubBufSize += StubSize;
}
}
- handleObjectLoaded(obj.take());
+ // Get section data size and alignment
+ uint64_t Alignment64;
+ uint64_t DataSize;
+ Check(Section.getSize(DataSize));
+ Check(Section.getAlignment(Alignment64));
- return false;
+ // 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;
}
void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
SymbolTableMap &SymbolTable) {
// Allocate memory for the section
unsigned SectionID = Sections.size();
- uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, sizeof(void*),
- SectionID);
+ uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, 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(Addr, TotalSize, TotalSize, 0));
+ Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, 0));
memset(Addr, 0, TotalSize);
- DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID
- << " new addr: " << format("%p", Addr)
- << " DataSize: " << TotalSize
- << "\n");
+ DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID << " new addr: "
+ << format("%p", Addr) << " DataSize: " << TotalSize << "\n");
// Assign the address of each symbol
for (CommonSymbolMap::const_iterator it = CommonSymbols.begin(),
- itEnd = CommonSymbols.end(); it != itEnd; it++) {
+ itEnd = CommonSymbols.end(); it != itEnd; ++it) {
+ uint64_t Size = it->second.first;
+ uint64_t Align = it->second.second;
StringRef Name;
it->first.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);
- uint64_t Size = it->second;
Offset += Size;
Addr += Size;
}
}
unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
- const SectionRef &Section,
- bool IsCode) {
-
- unsigned StubBufSize = 0,
- StubSize = getMaxStubSize();
- error_code err;
- if (StubSize > 0) {
- for (relocation_iterator i = Section.begin_relocations(),
- e = Section.end_relocations(); i != e; i.increment(err), Check(err))
- StubBufSize += StubSize;
- }
+ const SectionRef &Section, bool IsCode) {
+
StringRef data;
uint64_t Alignment64;
Check(Section.getContents(data));
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));
+ Check(Section.getName(Name));
+
+ StubBufSize = computeSectionStubBufSize(Obj, Section);
- unsigned Allocate;
+ // 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")
+ PaddingSize = 4;
+
+ uintptr_t Allocate;
unsigned SectionID = Sections.size();
uint8_t *Addr;
const char *pData = 0;
// Some sections, such as debug info, don't need to be loaded for execution.
// Leave those where they are.
if (IsRequired) {
- Allocate = DataSize + StubBufSize;
- Addr = IsCode
- ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID)
- : MemMgr->allocateDataSection(Allocate, Alignment, SectionID);
+ Allocate = DataSize + PaddingSize + StubBufSize;
+ 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!");
else
memcpy(Addr, pData, DataSize);
- DEBUG(dbgs() << "emitSection SectionID: " << SectionID
+ // Fill in any extra bytes we allocated for padding
+ if (PaddingSize != 0) {
+ memset(Addr + DataSize, 0, PaddingSize);
+ // Update the DataSize variable so that the stub offset is set correctly.
+ DataSize += PaddingSize;
+ }
+
+ DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
<< " obj addr: " << format("%p", pData)
<< " new addr: " << format("%p", Addr)
- << " DataSize: " << DataSize
- << " StubBufSize: " << StubBufSize
- << " Allocate: " << Allocate
- << "\n");
+ << " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
+ << " Allocate: " << Allocate << "\n");
Obj.updateSectionAddress(Section, (uint64_t)Addr);
- }
- else {
+ } 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
- << " obj addr: " << format("%p", data.data())
- << " new addr: 0"
- << " DataSize: " << DataSize
- << " StubBufSize: " << StubBufSize
- << " Allocate: " << Allocate
- << "\n");
+ 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(Addr, Allocate, DataSize,(uintptr_t)pData));
+ Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
return SectionID;
}
// 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);
+ SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(SymbolName);
if (Loc == GlobalSymbolTable.end()) {
ExternalSymbolRelocations[SymbolName].push_back(RE);
} else {
}
uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
- if (Arch == Triple::arm) {
+ 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
+
+ return Addr;
+ } 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;
+ uint32_t *StubAddr = (uint32_t *)Addr;
*StubAddr = 0xe51ff004; // ldr pc,<label>
- return (uint8_t*)++StubAddr;
- } else if (Arch == Triple::mipsel) {
- uint32_t *StubAddr = (uint32_t*)Addr;
+ return (uint8_t *)++StubAddr;
+ } 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.
StubAddr++;
*StubAddr = NopInstr;
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.
+ 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
+
+ return Addr;
+ } else if (Arch == Triple::systemz) {
+ writeInt16BE(Addr, 0xC418); // lgrl %r1,.+8
+ writeInt16BE(Addr+2, 0x0000);
+ writeInt16BE(Addr+4, 0x0004);
+ writeInt16BE(Addr+6, 0x07F1); // brc 15,%r1
+ // 8-byte address stored at Addr + 8
+ return Addr;
+ } else if (Arch == Triple::x86_64) {
+ *Addr = 0xFF; // jmp
+ *(Addr+1) = 0x25; // rip
+ // 32-bit PC-relative address of the GOT entry will be stored at Addr+2
}
return Addr;
}
uint64_t Addr) {
// The address to use for relocation resolution is not
// the address of the local section buffer. We must be doing
- // a remote execution environment of some sort. Re-apply any
- // relocations referencing this section with the given address.
+ // a remote execution environment of some sort. Relocations can't
+ // be applied until all the sections have been moved. The client must
+ // trigger this with a call to MCJIT::finalize() or
+ // RuntimeDyld::resolveRelocations().
//
// 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.
Sections[SectionID].LoadAddress = Addr;
- DEBUG(dbgs() << "Resolving relocations Section #" << SectionID
- << "\t" << format("%p", (uint8_t *)Addr)
- << "\n");
- resolveRelocationList(Relocations[SectionID], Addr);
-}
-
-void RuntimeDyldImpl::resolveRelocationEntry(const RelocationEntry &RE,
- uint64_t Value) {
- // Ignore relocations for sections that were not loaded
- if (Sections[RE.SectionID].Address != 0) {
- uint8_t *Target = Sections[RE.SectionID].Address + RE.Offset;
- DEBUG(dbgs() << "\tSectionID: " << RE.SectionID
- << " + " << RE.Offset << " (" << format("%p", Target) << ")"
- << " RelType: " << RE.RelType
- << " Addend: " << RE.Addend
- << "\n");
-
- resolveRelocation(Target, Sections[RE.SectionID].LoadAddress + RE.Offset,
- Value, RE.RelType, RE.Addend);
- }
}
void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
uint64_t Value) {
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
- resolveRelocationEntry(Relocs[i], Value);
+ const RelocationEntry &RE = Relocs[i];
+ // Ignore relocations for sections that were not loaded
+ if (Sections[RE.SectionID].Address == 0)
+ continue;
+ resolveRelocation(RE, Value);
}
}
void RuntimeDyldImpl::resolveExternalSymbols() {
- StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin(),
- e = ExternalSymbolRelocations.end();
- for (; i != e; i++) {
+ while (!ExternalSymbolRelocations.empty()) {
+ StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();
+
StringRef Name = i->first();
- RelocationList &Relocs = i->second;
- SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
- if (Loc == GlobalSymbolTable.end()) {
- // This is an external symbol, try to get it address from
- // MemoryManager.
- uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
- true);
- DEBUG(dbgs() << "Resolving relocations Name: " << Name
- << "\t" << format("%p", Addr)
- << "\n");
- resolveRelocationList(Relocs, (uintptr_t)Addr);
+ if (Name.size() == 0) {
+ // This is an absolute symbol, use an address of zero.
+ DEBUG(dbgs() << "Resolving absolute relocations."
+ << "\n");
+ RelocationList &Relocs = i->second;
+ resolveRelocationList(Relocs, 0);
} else {
- report_fatal_error("Expected external symbol");
+ uint64_t Addr = 0;
+ SymbolTableMap::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);
+ } 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;
+ }
+
+ // 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!");
+
+ updateGOTEntries(Name, Addr);
+ 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;
+ resolveRelocationList(Relocs, Addr);
}
+
+ ExternalSymbolRelocations.erase(i);
}
}
-
//===----------------------------------------------------------------------===//
// RuntimeDyld class implementation
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
+ // associates a single memory manager with a RuntimeDyld instance. Even
+ // 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;
MM = mm;
+ ProcessAllSections = false;
}
-RuntimeDyld::~RuntimeDyld() {
- delete Dyld;
+RuntimeDyld::~RuntimeDyld() { delete Dyld; }
+
+static std::unique_ptr<RuntimeDyldELF>
+createRuntimeDyldELF(RTDyldMemoryManager *MM, bool ProcessAllSections) {
+ std::unique_ptr<RuntimeDyldELF> Dyld(new RuntimeDyldELF(MM));
+ Dyld->setProcessAllSections(ProcessAllSections);
+ return Dyld;
}
-bool RuntimeDyld::loadObject(MemoryBuffer *InputBuffer) {
- if (!Dyld) {
- sys::LLVMFileType type = sys::IdentifyFileType(
- InputBuffer->getBufferStart(),
- static_cast<unsigned>(InputBuffer->getBufferSize()));
- switch (type) {
- case sys::ELF_Relocatable_FileType:
- case sys::ELF_Executable_FileType:
- case sys::ELF_SharedObject_FileType:
- case sys::ELF_Core_FileType:
- Dyld = new RuntimeDyldELF(MM);
- break;
- case sys::Mach_O_Object_FileType:
- case sys::Mach_O_Executable_FileType:
- case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
- case sys::Mach_O_Core_FileType:
- case sys::Mach_O_PreloadExecutable_FileType:
- case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
- case sys::Mach_O_DynamicLinker_FileType:
- case sys::Mach_O_Bundle_FileType:
- case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
- case sys::Mach_O_DSYMCompanion_FileType:
- Dyld = new RuntimeDyldMachO(MM);
- break;
- case sys::Unknown_FileType:
- case sys::Bitcode_FileType:
- case sys::Archive_FileType:
- case sys::COFF_FileType:
- report_fatal_error("Incompatible object format!");
- }
- } else {
- if (!Dyld->isCompatibleFormat(InputBuffer))
- report_fatal_error("Incompatible object format!");
+static std::unique_ptr<RuntimeDyldMachO>
+createRuntimeDyldMachO(RTDyldMemoryManager *MM, bool ProcessAllSections) {
+ std::unique_ptr<RuntimeDyldMachO> Dyld(new RuntimeDyldMachO(MM));
+ Dyld->setProcessAllSections(ProcessAllSections);
+ return Dyld;
+}
+
+ObjectImage *RuntimeDyld::loadObject(ObjectFile *InputObject) {
+ std::unique_ptr<ObjectImage> InputImage;
+
+ if (InputObject->isELF()) {
+ InputImage.reset(RuntimeDyldELF::createObjectImageFromFile(InputObject));
+ if (!Dyld)
+ Dyld = createRuntimeDyldELF(MM, ProcessAllSections).release();
+ } else if (InputObject->isMachO()) {
+ InputImage.reset(RuntimeDyldMachO::createObjectImageFromFile(InputObject));
+ if (!Dyld)
+ Dyld = createRuntimeDyldMachO(MM, ProcessAllSections).release();
+ } else
+ report_fatal_error("Incompatible object format!");
+
+ if (!Dyld->isCompatibleFile(InputObject))
+ report_fatal_error("Incompatible object format!");
+
+ Dyld->loadObject(InputImage.get());
+ return InputImage.release();
+}
+
+ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
+ std::unique_ptr<ObjectImage> InputImage;
+ 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:
+ InputImage.reset(RuntimeDyldELF::createObjectImage(InputBuffer));
+ if (!Dyld)
+ Dyld = createRuntimeDyldELF(MM, ProcessAllSections).release();
+ 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:
+ InputImage.reset(RuntimeDyldMachO::createObjectImage(InputBuffer));
+ if (!Dyld)
+ Dyld = createRuntimeDyldMachO(MM, ProcessAllSections).release();
+ 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!");
}
- return Dyld->loadObject(InputBuffer);
+ if (!Dyld->isCompatibleFormat(InputBuffer))
+ report_fatal_error("Incompatible object format!");
+
+ Dyld->loadObject(InputImage.get());
+ return InputImage.release();
}
void *RuntimeDyld::getSymbolAddress(StringRef Name) {
+ if (!Dyld)
+ return NULL;
return Dyld->getSymbolAddress(Name);
}
uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
+ if (!Dyld)
+ return 0;
return Dyld->getSymbolLoadAddress(Name);
}
-void RuntimeDyld::resolveRelocations() {
- Dyld->resolveRelocations();
-}
+void RuntimeDyld::resolveRelocations() { Dyld->resolveRelocations(); }
-void RuntimeDyld::reassignSectionAddress(unsigned SectionID,
- uint64_t Addr) {
+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)
+ Dyld->registerEHFrames();
+}
+
+void RuntimeDyld::deregisterEHFrames() {
+ if (Dyld)
+ Dyld->deregisterEHFrames();
}
} // end namespace llvm
projects / oota-llvm.git / blobdiff