-//===-- RuntimeDyld.cpp - Run-time dynamic linker for MC-JIT ------*- C++ -*-===//
+//===-- RuntimeDyld.cpp - Run-time dynamic linker for MC-JIT ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "dyld"
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
+#include "JITRegistrar.h"
+#include "ObjectImageCommon.h"
+#include "RuntimeDyldELF.h"
#include "RuntimeDyldImpl.h"
-#include "llvm/Support/Path.h"
+#include "RuntimeDyldMachO.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 {
-void RuntimeDyldImpl::extractFunction(StringRef Name, uint8_t *StartAddress,
- uint8_t *EndAddress) {
- // FIXME: DEPRECATED in favor of by-section allocation.
- // Allocate memory for the function via the memory manager.
- uintptr_t Size = EndAddress - StartAddress + 1;
- uintptr_t AllocSize = Size;
- uint8_t *Mem = MemMgr->startFunctionBody(Name.data(), AllocSize);
- assert(Size >= (uint64_t)(EndAddress - StartAddress + 1) &&
- "Memory manager failed to allocate enough memory!");
- // Copy the function payload into the memory block.
- memcpy(Mem, StartAddress, Size);
- MemMgr->endFunctionBody(Name.data(), Mem, Mem + Size);
- // Remember where we put it.
- unsigned SectionID = Sections.size();
- Sections.push_back(sys::MemoryBlock(Mem, Size));
+void RuntimeDyldImpl::registerEHFrames() {}
- // Default the assigned address for this symbol to wherever this
- // allocated it.
- SymbolTable[Name] = SymbolLoc(SectionID, 0);
- DEBUG(dbgs() << " allocated to [" << Mem << ", " << Mem + Size << "]\n");
-}
+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, SectionLoadAddress[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);
}
}
-void RuntimeDyldImpl::mapSectionAddress(void *LocalAddress,
+void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
uint64_t TargetAddress) {
- assert(SectionLocalMemToID.count(LocalAddress) &&
- "Attempting to remap address of unknown section!");
- unsigned SectionID = SectionLocalMemToID[LocalAddress];
- reassignSectionAddress(SectionID, 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!");
+}
+
+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;
+}
+
+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();
+
+ // 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;
+
+ // Parse symbols
+ DEBUG(dbgs() << "Parse symbols:\n");
+ 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));
+
+ uint32_t Flags = I->getFlags();
+
+ 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 SectOffset;
+ StringRef SectionData;
+ 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, IsCode, LocalSections);
+ LocalSymbols[Name.data()] = 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);
+
+ // Parse and process relocations
+ DEBUG(dbgs() << "Parse relocations:\n");
+ 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();
+
+ if (I == E && !ProcessAllSections)
+ continue;
+
+ 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);
+ }
+
+ // 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);
+}
+
+// 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;
+ }
+ }
+
+ // Get section data size and alignment
+ uint64_t Alignment64;
+ uint64_t DataSize;
+ Check(Section.getSize(DataSize));
+ Check(Section.getAlignment(Alignment64));
+
+ // 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,
+ 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;
+ }
+}
+
+unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
+ const SectionRef &Section, bool IsCode) {
+
+ 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;
+ 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);
+
+ // 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 + 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;
+ }
+
+ 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");
+ }
+
+ Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
+ return SectionID;
+}
+
+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;
+}
+
+void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
+ unsigned SectionID) {
+ Relocations[SectionID].push_back(RE);
+}
+
+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);
+ }
+}
+
+uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
+ 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;
+ *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;
+}
+
+// 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;
+}
+
+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);
+ }
+}
+
+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);
+ }
+
+ 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;
-}
-
-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!");
+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;
+}
+
+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);
}
-void RuntimeDyld::resolveRelocations() {
- Dyld->resolveRelocations();
+uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
+ if (!Dyld)
+ return 0;
+ return Dyld->getSymbolLoadAddress(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);
}
-void RuntimeDyld::mapSectionAddress(void *LocalAddress,
+void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
uint64_t TargetAddress) {
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