forked from OSchip/llvm-project
812 lines
29 KiB
C++
812 lines
29 KiB
C++
//===-- RuntimeDyld.cpp - Run-time dynamic linker for MC-JIT ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Implementation of the MC-JIT runtime dynamic linker.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ExecutionEngine/RuntimeDyld.h"
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#include "JITRegistrar.h"
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#include "ObjectImageCommon.h"
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#include "RuntimeDyldELF.h"
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#include "RuntimeDyldImpl.h"
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#include "RuntimeDyldMachO.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/MutexGuard.h"
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using namespace llvm;
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using namespace llvm::object;
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#define DEBUG_TYPE "dyld"
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// Empty out-of-line virtual destructor as the key function.
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RuntimeDyldImpl::~RuntimeDyldImpl() {}
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// Pin the JITRegistrar's and ObjectImage*'s vtables to this file.
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void JITRegistrar::anchor() {}
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void ObjectImage::anchor() {}
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void ObjectImageCommon::anchor() {}
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namespace llvm {
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void RuntimeDyldImpl::registerEHFrames() {}
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void RuntimeDyldImpl::deregisterEHFrames() {}
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// Resolve the relocations for all symbols we currently know about.
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void RuntimeDyldImpl::resolveRelocations() {
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MutexGuard locked(lock);
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// First, resolve relocations associated with external symbols.
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resolveExternalSymbols();
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// Just iterate over the sections we have and resolve all the relocations
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// in them. Gross overkill, but it gets the job done.
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for (int i = 0, e = Sections.size(); i != e; ++i) {
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// The Section here (Sections[i]) refers to the section in which the
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// symbol for the relocation is located. The SectionID in the relocation
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// entry provides the section to which the relocation will be applied.
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uint64_t Addr = Sections[i].LoadAddress;
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DEBUG(dbgs() << "Resolving relocations Section #" << i << "\t"
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<< format("%p", (uint8_t *)Addr) << "\n");
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resolveRelocationList(Relocations[i], Addr);
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Relocations.erase(i);
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}
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}
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void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
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uint64_t TargetAddress) {
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MutexGuard locked(lock);
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for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
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if (Sections[i].Address == LocalAddress) {
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reassignSectionAddress(i, TargetAddress);
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return;
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}
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}
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llvm_unreachable("Attempting to remap address of unknown section!");
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}
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static error_code getOffset(const SymbolRef &Sym, uint64_t &Result) {
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uint64_t Address;
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if (error_code EC = Sym.getAddress(Address))
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return EC;
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if (Address == UnknownAddressOrSize) {
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Result = UnknownAddressOrSize;
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return object_error::success;
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}
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const ObjectFile *Obj = Sym.getObject();
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section_iterator SecI(Obj->section_begin());
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if (error_code EC = Sym.getSection(SecI))
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return EC;
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if (SecI == Obj->section_end()) {
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Result = UnknownAddressOrSize;
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return object_error::success;
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}
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uint64_t SectionAddress;
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if (error_code EC = SecI->getAddress(SectionAddress))
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return EC;
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Result = Address - SectionAddress;
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return object_error::success;
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}
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ObjectImage *RuntimeDyldImpl::loadObject(ObjectImage *InputObject) {
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MutexGuard locked(lock);
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std::unique_ptr<ObjectImage> Obj(InputObject);
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if (!Obj)
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return nullptr;
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// Save information about our target
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Arch = (Triple::ArchType)Obj->getArch();
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IsTargetLittleEndian = Obj->getObjectFile()->isLittleEndian();
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// Compute the memory size required to load all sections to be loaded
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// and pass this information to the memory manager
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if (MemMgr->needsToReserveAllocationSpace()) {
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uint64_t CodeSize = 0, DataSizeRO = 0, DataSizeRW = 0;
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computeTotalAllocSize(*Obj, CodeSize, DataSizeRO, DataSizeRW);
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MemMgr->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
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}
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// Symbols found in this object
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StringMap<SymbolLoc> LocalSymbols;
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// Used sections from the object file
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ObjSectionToIDMap LocalSections;
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// Common symbols requiring allocation, with their sizes and alignments
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CommonSymbolMap CommonSymbols;
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// Maximum required total memory to allocate all common symbols
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uint64_t CommonSize = 0;
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// Parse symbols
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DEBUG(dbgs() << "Parse symbols:\n");
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for (symbol_iterator I = Obj->begin_symbols(), E = Obj->end_symbols(); I != E;
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++I) {
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object::SymbolRef::Type SymType;
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StringRef Name;
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Check(I->getType(SymType));
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Check(I->getName(Name));
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uint32_t Flags = I->getFlags();
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bool IsCommon = Flags & SymbolRef::SF_Common;
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if (IsCommon) {
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// Add the common symbols to a list. We'll allocate them all below.
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if (!GlobalSymbolTable.count(Name)) {
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uint32_t Align;
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Check(I->getAlignment(Align));
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uint64_t Size = 0;
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Check(I->getSize(Size));
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CommonSize += Size + Align;
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CommonSymbols[*I] = CommonSymbolInfo(Size, Align);
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}
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} else {
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if (SymType == object::SymbolRef::ST_Function ||
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SymType == object::SymbolRef::ST_Data ||
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SymType == object::SymbolRef::ST_Unknown) {
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uint64_t SectOffset;
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StringRef SectionData;
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bool IsCode;
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section_iterator SI = Obj->end_sections();
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Check(getOffset(*I, SectOffset));
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Check(I->getSection(SI));
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if (SI == Obj->end_sections())
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continue;
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Check(SI->getContents(SectionData));
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Check(SI->isText(IsCode));
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unsigned SectionID =
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findOrEmitSection(*Obj, *SI, IsCode, LocalSections);
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LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
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DEBUG(dbgs() << "\tOffset: " << format("%p", (uintptr_t)SectOffset)
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<< " flags: " << Flags << " SID: " << SectionID);
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GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
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}
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}
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DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
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}
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// Allocate common symbols
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if (CommonSize != 0)
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emitCommonSymbols(*Obj, CommonSymbols, CommonSize, GlobalSymbolTable);
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// Parse and process relocations
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DEBUG(dbgs() << "Parse relocations:\n");
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for (section_iterator SI = Obj->begin_sections(), SE = Obj->end_sections();
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SI != SE; ++SI) {
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unsigned SectionID = 0;
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StubMap Stubs;
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section_iterator RelocatedSection = SI->getRelocatedSection();
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relocation_iterator I = SI->relocation_begin();
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relocation_iterator E = SI->relocation_end();
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if (I == E && !ProcessAllSections)
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continue;
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bool IsCode = false;
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Check(RelocatedSection->isText(IsCode));
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SectionID =
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findOrEmitSection(*Obj, *RelocatedSection, IsCode, LocalSections);
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DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
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for (; I != E;)
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I = processRelocationRef(SectionID, I, *Obj, LocalSections, LocalSymbols,
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Stubs);
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}
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// Give the subclasses a chance to tie-up any loose ends.
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finalizeLoad(*Obj, LocalSections);
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return Obj.release();
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}
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// A helper method for computeTotalAllocSize.
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// Computes the memory size required to allocate sections with the given sizes,
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// assuming that all sections are allocated with the given alignment
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static uint64_t
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computeAllocationSizeForSections(std::vector<uint64_t> &SectionSizes,
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uint64_t Alignment) {
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uint64_t TotalSize = 0;
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for (size_t Idx = 0, Cnt = SectionSizes.size(); Idx < Cnt; Idx++) {
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uint64_t AlignedSize =
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(SectionSizes[Idx] + Alignment - 1) / Alignment * Alignment;
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TotalSize += AlignedSize;
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}
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return TotalSize;
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}
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// Compute an upper bound of the memory size that is required to load all
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// sections
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void RuntimeDyldImpl::computeTotalAllocSize(ObjectImage &Obj,
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uint64_t &CodeSize,
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uint64_t &DataSizeRO,
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uint64_t &DataSizeRW) {
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// Compute the size of all sections required for execution
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std::vector<uint64_t> CodeSectionSizes;
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std::vector<uint64_t> ROSectionSizes;
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std::vector<uint64_t> RWSectionSizes;
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uint64_t MaxAlignment = sizeof(void *);
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// Collect sizes of all sections to be loaded;
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// also determine the max alignment of all sections
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for (section_iterator SI = Obj.begin_sections(), SE = Obj.end_sections();
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SI != SE; ++SI) {
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const SectionRef &Section = *SI;
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bool IsRequired;
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Check(Section.isRequiredForExecution(IsRequired));
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// Consider only the sections that are required to be loaded for execution
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if (IsRequired) {
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uint64_t DataSize = 0;
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uint64_t Alignment64 = 0;
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bool IsCode = false;
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bool IsReadOnly = false;
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StringRef Name;
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Check(Section.getSize(DataSize));
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Check(Section.getAlignment(Alignment64));
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Check(Section.isText(IsCode));
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Check(Section.isReadOnlyData(IsReadOnly));
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Check(Section.getName(Name));
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unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
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uint64_t StubBufSize = computeSectionStubBufSize(Obj, Section);
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uint64_t SectionSize = DataSize + StubBufSize;
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// The .eh_frame section (at least on Linux) needs an extra four bytes
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// padded
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// with zeroes added at the end. For MachO objects, this section has a
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// slightly different name, so this won't have any effect for MachO
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// objects.
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if (Name == ".eh_frame")
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SectionSize += 4;
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if (SectionSize > 0) {
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// save the total size of the section
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if (IsCode) {
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CodeSectionSizes.push_back(SectionSize);
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} else if (IsReadOnly) {
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ROSectionSizes.push_back(SectionSize);
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} else {
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RWSectionSizes.push_back(SectionSize);
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}
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// update the max alignment
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if (Alignment > MaxAlignment) {
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MaxAlignment = Alignment;
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}
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}
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}
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}
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// Compute the size of all common symbols
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uint64_t CommonSize = 0;
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for (symbol_iterator I = Obj.begin_symbols(), E = Obj.end_symbols(); I != E;
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++I) {
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uint32_t Flags = I->getFlags();
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if (Flags & SymbolRef::SF_Common) {
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// Add the common symbols to a list. We'll allocate them all below.
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uint64_t Size = 0;
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Check(I->getSize(Size));
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CommonSize += Size;
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}
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}
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if (CommonSize != 0) {
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RWSectionSizes.push_back(CommonSize);
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}
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// Compute the required allocation space for each different type of sections
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// (code, read-only data, read-write data) assuming that all sections are
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// allocated with the max alignment. Note that we cannot compute with the
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// individual alignments of the sections, because then the required size
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// depends on the order, in which the sections are allocated.
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CodeSize = computeAllocationSizeForSections(CodeSectionSizes, MaxAlignment);
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DataSizeRO = computeAllocationSizeForSections(ROSectionSizes, MaxAlignment);
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DataSizeRW = computeAllocationSizeForSections(RWSectionSizes, MaxAlignment);
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}
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// compute stub buffer size for the given section
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unsigned RuntimeDyldImpl::computeSectionStubBufSize(ObjectImage &Obj,
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const SectionRef &Section) {
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unsigned StubSize = getMaxStubSize();
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if (StubSize == 0) {
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return 0;
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}
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// FIXME: this is an inefficient way to handle this. We should computed the
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// necessary section allocation size in loadObject by walking all the sections
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// once.
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unsigned StubBufSize = 0;
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for (section_iterator SI = Obj.begin_sections(), SE = Obj.end_sections();
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SI != SE; ++SI) {
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section_iterator RelSecI = SI->getRelocatedSection();
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if (!(RelSecI == Section))
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continue;
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for (const RelocationRef &Reloc : SI->relocations()) {
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(void)Reloc;
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StubBufSize += StubSize;
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}
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}
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// Get section data size and alignment
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uint64_t Alignment64;
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uint64_t DataSize;
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Check(Section.getSize(DataSize));
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Check(Section.getAlignment(Alignment64));
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// Add stubbuf size alignment
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unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
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unsigned StubAlignment = getStubAlignment();
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unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
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if (StubAlignment > EndAlignment)
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StubBufSize += StubAlignment - EndAlignment;
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return StubBufSize;
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}
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void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
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const CommonSymbolMap &CommonSymbols,
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uint64_t TotalSize,
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SymbolTableMap &SymbolTable) {
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// Allocate memory for the section
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unsigned SectionID = Sections.size();
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uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, sizeof(void *),
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SectionID, StringRef(), false);
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if (!Addr)
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report_fatal_error("Unable to allocate memory for common symbols!");
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uint64_t Offset = 0;
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Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, 0));
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memset(Addr, 0, TotalSize);
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DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID << " new addr: "
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<< format("%p", Addr) << " DataSize: " << TotalSize << "\n");
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// Assign the address of each symbol
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for (CommonSymbolMap::const_iterator it = CommonSymbols.begin(),
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itEnd = CommonSymbols.end(); it != itEnd; ++it) {
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uint64_t Size = it->second.first;
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uint64_t Align = it->second.second;
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StringRef Name;
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it->first.getName(Name);
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if (Align) {
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// This symbol has an alignment requirement.
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uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align);
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Addr += AlignOffset;
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Offset += AlignOffset;
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DEBUG(dbgs() << "Allocating common symbol " << Name << " address "
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<< format("%p\n", Addr));
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}
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Obj.updateSymbolAddress(it->first, (uint64_t)Addr);
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SymbolTable[Name.data()] = SymbolLoc(SectionID, Offset);
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Offset += Size;
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Addr += Size;
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}
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}
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unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
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const SectionRef &Section, bool IsCode) {
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StringRef data;
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uint64_t Alignment64;
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Check(Section.getContents(data));
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Check(Section.getAlignment(Alignment64));
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unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
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bool IsRequired;
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bool IsVirtual;
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bool IsZeroInit;
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bool IsReadOnly;
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uint64_t DataSize;
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unsigned PaddingSize = 0;
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unsigned StubBufSize = 0;
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StringRef Name;
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Check(Section.isRequiredForExecution(IsRequired));
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Check(Section.isVirtual(IsVirtual));
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Check(Section.isZeroInit(IsZeroInit));
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Check(Section.isReadOnlyData(IsReadOnly));
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Check(Section.getSize(DataSize));
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Check(Section.getName(Name));
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StubBufSize = computeSectionStubBufSize(Obj, Section);
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// The .eh_frame section (at least on Linux) needs an extra four bytes padded
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// with zeroes added at the end. For MachO objects, this section has a
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// slightly different name, so this won't have any effect for MachO objects.
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if (Name == ".eh_frame")
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PaddingSize = 4;
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uintptr_t Allocate;
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unsigned SectionID = Sections.size();
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uint8_t *Addr;
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const char *pData = nullptr;
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// Some sections, such as debug info, don't need to be loaded for execution.
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// Leave those where they are.
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if (IsRequired) {
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Allocate = DataSize + PaddingSize + StubBufSize;
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Addr = IsCode ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID,
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Name)
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: MemMgr->allocateDataSection(Allocate, Alignment, SectionID,
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Name, IsReadOnly);
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if (!Addr)
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report_fatal_error("Unable to allocate section memory!");
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// Virtual sections have no data in the object image, so leave pData = 0
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if (!IsVirtual)
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pData = data.data();
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// Zero-initialize or copy the data from the image
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if (IsZeroInit || IsVirtual)
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memset(Addr, 0, DataSize);
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else
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memcpy(Addr, pData, DataSize);
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// Fill in any extra bytes we allocated for padding
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if (PaddingSize != 0) {
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memset(Addr + DataSize, 0, PaddingSize);
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// Update the DataSize variable so that the stub offset is set correctly.
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DataSize += PaddingSize;
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}
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DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
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<< " obj addr: " << format("%p", pData)
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<< " new addr: " << format("%p", Addr)
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<< " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
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<< " Allocate: " << Allocate << "\n");
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Obj.updateSectionAddress(Section, (uint64_t)Addr);
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} else {
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// Even if we didn't load the section, we need to record an entry for it
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// to handle later processing (and by 'handle' I mean don't do anything
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// with these sections).
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Allocate = 0;
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Addr = nullptr;
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DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
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<< " obj addr: " << format("%p", data.data()) << " new addr: 0"
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<< " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
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<< " Allocate: " << Allocate << "\n");
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}
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Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
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return SectionID;
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}
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unsigned RuntimeDyldImpl::findOrEmitSection(ObjectImage &Obj,
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const SectionRef &Section,
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bool IsCode,
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ObjSectionToIDMap &LocalSections) {
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unsigned SectionID = 0;
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ObjSectionToIDMap::iterator i = LocalSections.find(Section);
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if (i != LocalSections.end())
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SectionID = i->second;
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else {
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SectionID = emitSection(Obj, Section, IsCode);
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LocalSections[Section] = SectionID;
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}
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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 ||
|
|
Arch == Triple::arm64 || Arch == Triple::arm64_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
|
|
} else if (Arch == Triple::x86) {
|
|
*Addr = 0xE9; // 32-bit pc-relative jump.
|
|
}
|
|
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 == nullptr)
|
|
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 = nullptr;
|
|
MM = mm;
|
|
ProcessAllSections = false;
|
|
}
|
|
|
|
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(std::unique_ptr<ObjectFile> InputObject) {
|
|
std::unique_ptr<ObjectImage> InputImage;
|
|
|
|
ObjectFile &Obj = *InputObject;
|
|
|
|
if (InputObject->isELF()) {
|
|
InputImage.reset(RuntimeDyldELF::createObjectImageFromFile(std::move(InputObject)));
|
|
if (!Dyld)
|
|
Dyld = createRuntimeDyldELF(MM, ProcessAllSections).release();
|
|
} else if (InputObject->isMachO()) {
|
|
InputImage.reset(RuntimeDyldMachO::createObjectImageFromFile(std::move(InputObject)));
|
|
if (!Dyld)
|
|
Dyld = createRuntimeDyldMachO(MM, ProcessAllSections).release();
|
|
} else
|
|
report_fatal_error("Incompatible object format!");
|
|
|
|
if (!Dyld->isCompatibleFile(&Obj))
|
|
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!");
|
|
}
|
|
|
|
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 nullptr;
|
|
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::reassignSectionAddress(unsigned SectionID, uint64_t Addr) {
|
|
Dyld->reassignSectionAddress(SectionID, Addr);
|
|
}
|
|
|
|
void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
|
|
uint64_t TargetAddress) {
|
|
Dyld->mapSectionAddress(LocalAddress, TargetAddress);
|
|
}
|
|
|
|
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
|