-//===-- RuntimeDyld.h - Run-time dynamic linker for MC-JIT ------*- C++ -*-===//
+//===-- RuntimeDyld.cpp - Run-time dynamic linker for MC-JIT ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/Twine.h"
+#define DEBUG_TYPE "dyld"
#include "llvm/ExecutionEngine/RuntimeDyld.h"
-#include "llvm/Object/MachOObject.h"
-#include "llvm/Support/Memory.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/system_error.h"
+#include "JITRegistrar.h"
+#include "ObjectImageCommon.h"
+#include "RuntimeDyldELF.h"
+#include "RuntimeDyldImpl.h"
+#include "RuntimeDyldMachO.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/MutexGuard.h"
+#include "llvm/Object/ELF.h"
+
using namespace llvm;
using namespace llvm::object;
-namespace llvm {
-class RuntimeDyldImpl {
- // Master symbol table. As modules are loaded and external symbols are
- // resolved, their addresses are stored here.
- StringMap<void*> SymbolTable;
-
- // FIXME: Should have multiple data blocks, one for each loaded chunk of
- // compiled code.
- sys::MemoryBlock Data;
-
- bool HasError;
- std::string ErrorStr;
-
- // Set the error state and record an error string.
- bool Error(const Twine &Msg) {
- ErrorStr = Msg.str();
- HasError = true;
- return true;
- }
+// Empty out-of-line virtual destructor as the key function.
+RuntimeDyldImpl::~RuntimeDyldImpl() {}
- bool loadSegment32(const MachOObject *Obj,
- const MachOObject::LoadCommandInfo *SegmentLCI,
- const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
- bool loadSegment64(const MachOObject *Obj,
- const MachOObject::LoadCommandInfo *SegmentLCI,
- const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
+// Pin the JITRegistrar's and ObjectImage*'s vtables to this file.
+void JITRegistrar::anchor() {}
+void ObjectImage::anchor() {}
+void ObjectImageCommon::anchor() {}
-public:
- RuntimeDyldImpl() : HasError(false) {}
+namespace llvm {
- bool loadObject(MemoryBuffer *InputBuffer);
+void RuntimeDyldImpl::registerEHFrames() {
+}
- void *getSymbolAddress(StringRef Name) {
- // Use lookup() rather than [] because we don't want to add an entry
- // if there isn't one already, which the [] operator does.
- return SymbolTable.lookup(Name);
- }
+void RuntimeDyldImpl::deregisterEHFrames() {
+}
- sys::MemoryBlock getMemoryBlock() { return Data; }
-
- // Is the linker in an error state?
- bool hasError() { return HasError; }
-
- // Mark the error condition as handled and continue.
- void clearError() { HasError = false; }
-
- // Get the error message.
- StringRef getErrorString() { return ErrorStr; }
-};
-
-
-
-bool RuntimeDyldImpl::
-loadSegment32(const MachOObject *Obj,
- const MachOObject::LoadCommandInfo *SegmentLCI,
- const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
- InMemoryStruct<macho::SegmentLoadCommand> Segment32LC;
- Obj->ReadSegmentLoadCommand(*SegmentLCI, Segment32LC);
- if (!Segment32LC)
- return Error("unable to load segment load command");
-
- // Map the segment into memory.
- std::string ErrorStr;
- Data = sys::Memory::AllocateRWX(Segment32LC->VMSize, 0, &ErrorStr);
- if (!Data.base())
- return Error("unable to allocate memory block: '" + ErrorStr + "'");
- memcpy(Data.base(), Obj->getData(Segment32LC->FileOffset,
- Segment32LC->FileSize).data(),
- Segment32LC->FileSize);
- memset((char*)Data.base() + Segment32LC->FileSize, 0,
- Segment32LC->VMSize - Segment32LC->FileSize);
-
- // Bind the section indices to address.
- void **SectionBases = new void*[Segment32LC->NumSections];
- for (unsigned i = 0; i != Segment32LC->NumSections; ++i) {
- InMemoryStruct<macho::Section> Sect;
- Obj->ReadSection(*SegmentLCI, i, Sect);
- if (!Sect)
- return Error("unable to load section: '" + Twine(i) + "'");
-
- // FIXME: We don't support relocations yet.
- if (Sect->NumRelocationTableEntries != 0)
- return Error("not yet implemented: relocations!");
-
- // FIXME: Improve check.
- if (Sect->Flags != 0x80000400)
- return Error("unsupported section type!");
-
- SectionBases[i] = (char*) Data.base() + Sect->Address;
+// 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) {
+ // 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);
}
+}
- // Bind all the symbols to address.
- for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
- InMemoryStruct<macho::SymbolTableEntry> STE;
- Obj->ReadSymbolTableEntry(SymtabLC->SymbolTableOffset, i, STE);
- if (!STE)
- return Error("unable to read symbol: '" + Twine(i) + "'");
- if (STE->SectionIndex == 0)
- return Error("unexpected undefined symbol!");
-
- unsigned Index = STE->SectionIndex - 1;
- if (Index >= Segment32LC->NumSections)
- return Error("invalid section index for symbol: '" + Twine() + "'");
-
- // Get the symbol name.
- StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
-
- // Get the section base address.
- void *SectionBase = SectionBases[Index];
+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);
+ return;
+ }
+ }
+ llvm_unreachable("Attempting to remap address of unknown section!");
+}
- // Get the symbol address.
- void *Address = (char*) SectionBase + STE->Value;
+// 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);
+}
- // FIXME: Check the symbol type and flags.
- if (STE->Type != 0xF)
- return Error("unexpected symbol type!");
- if (STE->Flags != 0x0)
- return Error("unexpected symbol type!");
+ObjectImage *RuntimeDyldImpl::loadObject(ObjectBuffer *InputBuffer) {
+ MutexGuard locked(lock);
+
+ OwningPtr<ObjectImage> obj(createObjectImage(InputBuffer));
+ if (!obj)
+ report_fatal_error("Unable to create object image from memory buffer!");
+
+ // Save information about our target
+ Arch = (Triple::ArchType)obj->getArch();
+ IsTargetLittleEndian = obj->getObjectFile()->isLittleEndian();
+
+ // 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;
+
+ 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));
+
+ uint32_t flags;
+ Check(i->getFlags(flags));
+
+ 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 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);
+ }
+ }
+ DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
+ }
- SymbolTable[Name] = Address;
+ // Allocate common symbols
+ if (CommonSize != 0)
+ 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;
+ 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;
+ }
+
+ processRelocationRef(SectionID, *i, *obj, LocalSections, LocalSymbols,
+ Stubs);
+ }
}
- // We've loaded the section; now mark the functions in it as executable.
- // FIXME: We really should use the JITMemoryManager for this.
- sys::Memory::setRangeExecutable(Data.base(), Data.size());
+ // Give the subclasses a chance to tie-up any loose ends.
+ finalizeLoad(LocalSections);
- delete SectionBases;
- return false;
+ return obj.take();
}
+void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
+ const CommonSymbolMap &CommonSymbols,
+ uint64_t TotalSize,
+ SymbolTableMap &SymbolTable) {
+ // Allocate memory for the section
+ unsigned SectionID = Sections.size();
+ 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(StringRef(), Addr, TotalSize, 0));
+ memset(Addr, 0, TotalSize);
+
+ 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++) {
+ 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);
+ Offset += Size;
+ Addr += Size;
+ }
+}
-bool RuntimeDyldImpl::
-loadSegment64(const MachOObject *Obj,
- const MachOObject::LoadCommandInfo *SegmentLCI,
- const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
- InMemoryStruct<macho::Segment64LoadCommand> Segment64LC;
- Obj->ReadSegment64LoadCommand(*SegmentLCI, Segment64LC);
- if (!Segment64LC)
- return Error("unable to load segment load command");
-
- // Map the segment into memory.
- std::string ErrorStr;
- Data = sys::Memory::AllocateRWX(Segment64LC->VMSize, 0, &ErrorStr);
- if (!Data.base())
- return Error("unable to allocate memory block: '" + ErrorStr + "'");
- memcpy(Data.base(), Obj->getData(Segment64LC->FileOffset,
- Segment64LC->FileSize).data(),
- Segment64LC->FileSize);
- memset((char*)Data.base() + Segment64LC->FileSize, 0,
- Segment64LC->VMSize - Segment64LC->FileSize);
-
- // Bind the section indices to address.
- void **SectionBases = new void*[Segment64LC->NumSections];
- for (unsigned i = 0; i != Segment64LC->NumSections; ++i) {
- InMemoryStruct<macho::Section64> Sect;
- Obj->ReadSection64(*SegmentLCI, i, Sect);
- if (!Sect)
- return Error("unable to load section: '" + Twine(i) + "'");
-
- // FIXME: We don't support relocations yet.
- if (Sect->NumRelocationTableEntries != 0)
- return Error("not yet implemented: relocations!");
-
- // FIXME: Improve check.
- if (Sect->Flags != 0x80000400)
- return Error("unsupported section type!");
-
- SectionBases[i] = (char*) Data.base() + Sect->Address;
+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;
+ }
+ }
}
- // Bind all the symbols to address.
- for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
- InMemoryStruct<macho::Symbol64TableEntry> STE;
- Obj->ReadSymbol64TableEntry(SymtabLC->SymbolTableOffset, i, STE);
- if (!STE)
- return Error("unable to read symbol: '" + Twine(i) + "'");
- if (STE->SectionIndex == 0)
- return Error("unexpected undefined symbol!");
+ StringRef data;
+ uint64_t Alignment64;
+ Check(Section.getContents(data));
+ Check(Section.getAlignment(Alignment64));
+
+ unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
+ bool IsRequired;
+ bool IsVirtual;
+ bool IsZeroInit;
+ bool IsReadOnly;
+ uint64_t DataSize;
+ unsigned PaddingSize = 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));
+ if (StubSize > 0) {
+ unsigned StubAlignment = getStubAlignment();
+ unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
+ if (StubAlignment > EndAlignment)
+ StubBufSize += StubAlignment - EndAlignment;
+ }
- unsigned Index = STE->SectionIndex - 1;
- if (Index >= Segment64LC->NumSections)
- return Error("invalid section index for symbol: '" + Twine() + "'");
+ // 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;
+
+ unsigned 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 + 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!");
+
+ // Virtual sections have no data in the object image, so leave pData = 0
+ if (!IsVirtual)
+ pData = data.data();
+
+ // Zero-initialize or copy the data from the image
+ if (IsZeroInit || IsVirtual)
+ memset(Addr, 0, DataSize);
+ else
+ memcpy(Addr, pData, DataSize);
+
+ // 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;
+ }
- // Get the symbol name.
- StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
+ 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 {
+ // 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");
+ }
- // Get the section base address.
- void *SectionBase = SectionBases[Index];
+ Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
+ return SectionID;
+}
- // Get the symbol address.
- void *Address = (char*) SectionBase + STE->Value;
+unsigned RuntimeDyldImpl::findOrEmitSection(ObjectImage &Obj,
+ const SectionRef &Section,
+ bool IsCode,
+ ObjSectionToIDMap &LocalSections) {
+
+ unsigned SectionID = 0;
+ ObjSectionToIDMap::iterator i = LocalSections.find(Section);
+ if (i != LocalSections.end())
+ SectionID = i->second;
+ else {
+ SectionID = emitSection(Obj, Section, IsCode);
+ LocalSections[Section] = SectionID;
+ }
+ return SectionID;
+}
- // FIXME: Check the symbol type and flags.
- if (STE->Type != 0xF)
- return Error("unexpected symbol type!");
- if (STE->Flags != 0x0)
- return Error("unexpected symbol type!");
+void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
+ unsigned SectionID) {
+ Relocations[SectionID].push_back(RE);
+}
- SymbolTable[Name] = Address;
+void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
+ StringRef SymbolName) {
+ // 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);
+ 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);
}
+}
- // We've loaded the section; now mark the functions in it as executable.
- // FIXME: We really should use the JITMemoryManager for this.
- sys::Memory::setRangeExecutable(Data.base(), Data.size());
+uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
+ if (Arch == Triple::aarch64) {
+ // 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) {
+ // 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;
+ } 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.
+ // c: 00000000 nop.
+ const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
+ const unsigned JrT9Instr = 0x03200008, NopInstr = 0x0;
+
+ *StubAddr = LuiT9Instr;
+ StubAddr++;
+ *StubAddr = AdduiT9Instr;
+ StubAddr++;
+ *StubAddr = JrT9Instr;
+ 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;
+}
- delete SectionBases;
- return false;
+// Assign an address to a symbol name and resolve all the relocations
+// associated with it.
+void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
+ 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. 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;
}
-bool RuntimeDyldImpl::loadObject(MemoryBuffer *InputBuffer) {
- // If the linker is in an error state, don't do anything.
- if (hasError())
- return true;
- // Load the Mach-O wrapper object.
- std::string ErrorStr;
- OwningPtr<MachOObject> Obj(
- MachOObject::LoadFromBuffer(InputBuffer, &ErrorStr));
- if (!Obj)
- return Error("unable to load object: '" + ErrorStr + "'");
-
- // Validate that the load commands match what we expect.
- const MachOObject::LoadCommandInfo *SegmentLCI = 0, *SymtabLCI = 0,
- *DysymtabLCI = 0;
- for (unsigned i = 0; i != Obj->getHeader().NumLoadCommands; ++i) {
- const MachOObject::LoadCommandInfo &LCI = Obj->getLoadCommandInfo(i);
- switch (LCI.Command.Type) {
- case macho::LCT_Segment:
- case macho::LCT_Segment64:
- if (SegmentLCI)
- return Error("unexpected input object (multiple segments)");
- SegmentLCI = &LCI;
- break;
- case macho::LCT_Symtab:
- if (SymtabLCI)
- return Error("unexpected input object (multiple symbol tables)");
- SymtabLCI = &LCI;
- break;
- case macho::LCT_Dysymtab:
- if (DysymtabLCI)
- return Error("unexpected input object (multiple symbol tables)");
- DysymtabLCI = &LCI;
- break;
- default:
- return Error("unexpected input object (unexpected load command");
- }
+void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
+ uint64_t Value) {
+ 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)
+ continue;
+ resolveRelocation(RE, Value);
}
+}
- if (!SymtabLCI)
- return Error("no symbol table found in object");
- if (!SegmentLCI)
- return Error("no symbol table found in object");
-
- // Read and register the symbol table data.
- InMemoryStruct<macho::SymtabLoadCommand> SymtabLC;
- Obj->ReadSymtabLoadCommand(*SymtabLCI, SymtabLC);
- if (!SymtabLC)
- return Error("unable to load symbol table load command");
- Obj->RegisterStringTable(*SymtabLC);
-
- // Read the dynamic link-edit information, if present (not present in static
- // objects).
- if (DysymtabLCI) {
- InMemoryStruct<macho::DysymtabLoadCommand> DysymtabLC;
- Obj->ReadDysymtabLoadCommand(*DysymtabLCI, DysymtabLC);
- if (!DysymtabLC)
- return Error("unable to load dynamic link-exit load command");
-
- // FIXME: We don't support anything interesting yet.
- if (DysymtabLC->LocalSymbolsIndex != 0)
- return Error("NOT YET IMPLEMENTED: local symbol entries");
- if (DysymtabLC->ExternalSymbolsIndex != 0)
- return Error("NOT YET IMPLEMENTED: non-external symbol entries");
- if (DysymtabLC->UndefinedSymbolsIndex != SymtabLC->NumSymbolTableEntries)
- return Error("NOT YET IMPLEMENTED: undefined symbol entries");
- }
+void RuntimeDyldImpl::resolveExternalSymbols() {
+ 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");
+ RelocationList &Relocs = i->second;
+ resolveRelocationList(Relocs, 0);
+ } else {
+ 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);
+ }
- // Load the segment load command.
- if (SegmentLCI->Command.Type == macho::LCT_Segment) {
- if (loadSegment32(Obj.get(), SegmentLCI, SymtabLC))
- return true;
- } else {
- if (loadSegment64(Obj.get(), SegmentLCI, SymtabLC))
- return true;
+ ExternalSymbolRelocations.erase(i);
}
-
- return false;
}
//===----------------------------------------------------------------------===//
// RuntimeDyld class implementation
-RuntimeDyld::RuntimeDyld() {
- Dyld = new RuntimeDyldImpl;
+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;
}
RuntimeDyld::~RuntimeDyld() {
delete Dyld;
}
-bool RuntimeDyld::loadObject(MemoryBuffer *InputBuffer) {
+ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
+ 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))
+ report_fatal_error("Incompatible object format!");
+ }
+
return Dyld->loadObject(InputBuffer);
}
void *RuntimeDyld::getSymbolAddress(StringRef Name) {
+ if (!Dyld)
+ return NULL;
return Dyld->getSymbolAddress(Name);
}
-sys::MemoryBlock RuntimeDyld::getMemoryBlock() {
- return Dyld->getMemoryBlock();
+uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
+ if (!Dyld)
+ return 0;
+ return Dyld->getSymbolLoadAddress(Name);
+}
+
+void RuntimeDyld::resolveRelocations() {
+ Dyld->resolveRelocations();
+}
+
+void RuntimeDyld::reassignSectionAddress(unsigned SectionID,
+ uint64_t Addr) {
+ Dyld->reassignSectionAddress(SectionID, Addr);
+}
+
+void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
+ uint64_t TargetAddress) {
+ Dyld->mapSectionAddress(LocalAddress, TargetAddress);
+}
+
+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