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This gets exception handling working on ELF and Macho (x86-64 at least). Other than the EH frame registration, this patch also implements support for GOT relocations which are used to locate the personality function on MachO. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181167 91177308-0d34-0410-b5e6-96231b3b80d8
556 lines
20 KiB
C++
556 lines
20 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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#define DEBUG_TYPE "dyld"
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#include "llvm/ExecutionEngine/RuntimeDyld.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/Support/MathExtras.h"
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#include "llvm/Support/Path.h"
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using namespace llvm;
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using namespace llvm::object;
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// Empty out-of-line virtual destructor as the key function.
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RTDyldMemoryManager::~RTDyldMemoryManager() {}
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void RTDyldMemoryManager::registerEHFrames(StringRef SectionData) {}
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RuntimeDyldImpl::~RuntimeDyldImpl() {}
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namespace llvm {
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StringRef RuntimeDyldImpl::getEHFrameSection() {
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return StringRef();
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}
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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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// 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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uint64_t Addr = Sections[i].LoadAddress;
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DEBUG(dbgs() << "Resolving relocations Section #" << i
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<< "\t" << format("%p", (uint8_t *)Addr)
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<< "\n");
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resolveRelocationList(Relocations[i], Addr);
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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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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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// Subclasses can implement this method to create specialized image instances.
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// The caller owns the pointer that is returned.
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ObjectImage *RuntimeDyldImpl::createObjectImage(ObjectBuffer *InputBuffer) {
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return new ObjectImageCommon(InputBuffer);
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}
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ObjectImage *RuntimeDyldImpl::loadObject(ObjectBuffer *InputBuffer) {
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OwningPtr<ObjectImage> obj(createObjectImage(InputBuffer));
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if (!obj)
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report_fatal_error("Unable to create object image from memory buffer!");
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Arch = (Triple::ArchType)obj->getArch();
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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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error_code err;
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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();
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i != e; i.increment(err)) {
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Check(err);
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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;
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Check(i->getFlags(flags));
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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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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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} 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 FileOffset;
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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(i->getFileOffset(FileOffset));
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Check(i->getSection(si));
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if (si == obj->end_sections()) continue;
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Check(si->getContents(SectionData));
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Check(si->isText(IsCode));
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const uint8_t* SymPtr = (const uint8_t*)InputBuffer->getBufferStart() +
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(uintptr_t)FileOffset;
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uintptr_t SectOffset = (uintptr_t)(SymPtr -
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(const uint8_t*)SectionData.begin());
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unsigned SectionID = findOrEmitSection(*obj, *si, IsCode, LocalSections);
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LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
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DEBUG(dbgs() << "\tFileOffset: " << format("%p", (uintptr_t)FileOffset)
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<< " flags: " << flags
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<< " SID: " << SectionID
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<< " Offset: " << format("%p", SectOffset));
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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, LocalSymbols);
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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(),
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se = obj->end_sections(); si != se; si.increment(err)) {
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Check(err);
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bool isFirstRelocation = true;
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unsigned SectionID = 0;
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StubMap Stubs;
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for (relocation_iterator i = si->begin_relocations(),
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e = si->end_relocations(); i != e; i.increment(err)) {
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Check(err);
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// If it's the first relocation in this section, find its SectionID
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if (isFirstRelocation) {
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SectionID = findOrEmitSection(*obj, *si, true, LocalSections);
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DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
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isFirstRelocation = false;
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}
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processRelocationRef(SectionID, *i, *obj, LocalSections, LocalSymbols,
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Stubs);
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}
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}
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return obj.take();
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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, 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
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<< " new addr: " << format("%p", Addr)
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<< " DataSize: " << TotalSize
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<< "\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,
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bool IsCode) {
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unsigned StubBufSize = 0,
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StubSize = getMaxStubSize();
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error_code err;
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if (StubSize > 0) {
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for (relocation_iterator i = Section.begin_relocations(),
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e = Section.end_relocations(); i != e; i.increment(err), Check(err))
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StubBufSize += StubSize;
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}
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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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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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if (StubSize > 0) {
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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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}
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unsigned Allocate;
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unsigned SectionID = Sections.size();
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uint8_t *Addr;
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const char *pData = 0;
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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 + StubBufSize;
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Addr = IsCode
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? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID)
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: MemMgr->allocateDataSection(Allocate, Alignment, SectionID, 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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DEBUG(dbgs() << "emitSection SectionID: " << SectionID
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<< " 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
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<< " StubBufSize: " << StubBufSize
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<< " Allocate: " << Allocate
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<< "\n");
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Obj.updateSectionAddress(Section, (uint64_t)Addr);
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}
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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 = 0;
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DEBUG(dbgs() << "emitSection SectionID: " << SectionID
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<< " Name: " << Name
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<< " obj addr: " << format("%p", data.data())
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<< " new addr: 0"
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<< " DataSize: " << DataSize
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<< " StubBufSize: " << StubBufSize
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<< " Allocate: " << Allocate
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<< "\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;
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}
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void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
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unsigned SectionID) {
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Relocations[SectionID].push_back(RE);
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}
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void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
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StringRef SymbolName) {
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// Relocation by symbol. If the symbol is found in the global symbol table,
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// create an appropriate section relocation. Otherwise, add it to
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// ExternalSymbolRelocations.
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SymbolTableMap::const_iterator Loc =
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GlobalSymbolTable.find(SymbolName);
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if (Loc == GlobalSymbolTable.end()) {
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ExternalSymbolRelocations[SymbolName].push_back(RE);
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} else {
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// Copy the RE since we want to modify its addend.
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RelocationEntry RECopy = RE;
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RECopy.Addend += Loc->second.second;
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Relocations[Loc->second.first].push_back(RECopy);
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}
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}
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uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
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if (Arch == Triple::aarch64) {
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// This stub has to be able to access the full address space,
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// since symbol lookup won't necessarily find a handy, in-range,
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// PLT stub for functions which could be anywhere.
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uint32_t *StubAddr = (uint32_t*)Addr;
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// Stub can use ip0 (== x16) to calculate address
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*StubAddr = 0xd2e00010; // movz ip0, #:abs_g3:<addr>
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StubAddr++;
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*StubAddr = 0xf2c00010; // movk ip0, #:abs_g2_nc:<addr>
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StubAddr++;
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*StubAddr = 0xf2a00010; // movk ip0, #:abs_g1_nc:<addr>
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StubAddr++;
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*StubAddr = 0xf2800010; // movk ip0, #:abs_g0_nc:<addr>
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StubAddr++;
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*StubAddr = 0xd61f0200; // br ip0
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return Addr;
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} else if (Arch == Triple::arm) {
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// TODO: There is only ARM far stub now. We should add the Thumb stub,
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// and stubs for branches Thumb - ARM and ARM - Thumb.
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uint32_t *StubAddr = (uint32_t*)Addr;
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*StubAddr = 0xe51ff004; // ldr pc,<label>
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return (uint8_t*)++StubAddr;
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} else if (Arch == Triple::mipsel || Arch == Triple::mips) {
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uint32_t *StubAddr = (uint32_t*)Addr;
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// 0: 3c190000 lui t9,%hi(addr).
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// 4: 27390000 addiu t9,t9,%lo(addr).
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// 8: 03200008 jr t9.
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// c: 00000000 nop.
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const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
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const unsigned JrT9Instr = 0x03200008, NopInstr = 0x0;
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*StubAddr = LuiT9Instr;
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StubAddr++;
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*StubAddr = AdduiT9Instr;
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StubAddr++;
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*StubAddr = JrT9Instr;
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StubAddr++;
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*StubAddr = NopInstr;
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return Addr;
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} else if (Arch == Triple::ppc64) {
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// PowerPC64 stub: the address points to a function descriptor
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// instead of the function itself. Load the function address
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// on r11 and sets it to control register. Also loads the function
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// TOC in r2 and environment pointer to r11.
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writeInt32BE(Addr, 0x3D800000); // lis r12, highest(addr)
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writeInt32BE(Addr+4, 0x618C0000); // ori r12, higher(addr)
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writeInt32BE(Addr+8, 0x798C07C6); // sldi r12, r12, 32
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writeInt32BE(Addr+12, 0x658C0000); // oris r12, r12, h(addr)
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writeInt32BE(Addr+16, 0x618C0000); // ori r12, r12, l(addr)
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writeInt32BE(Addr+20, 0xF8410028); // std r2, 40(r1)
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writeInt32BE(Addr+24, 0xE96C0000); // ld r11, 0(r12)
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writeInt32BE(Addr+28, 0xE84C0008); // ld r2, 0(r12)
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writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
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writeInt32BE(Addr+36, 0xE96C0010); // ld r11, 16(r2)
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writeInt32BE(Addr+40, 0x4E800420); // bctr
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return Addr;
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} else if (Arch == Triple::systemz) {
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writeInt16BE(Addr, 0xC418); // lgrl %r1,.+8
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writeInt16BE(Addr+2, 0x0000);
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writeInt16BE(Addr+4, 0x0004);
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writeInt16BE(Addr+6, 0x07F1); // brc 15,%r1
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// 8-byte address stored at Addr + 8
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return Addr;
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}
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return Addr;
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}
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// Assign an address to a symbol name and resolve all the relocations
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// associated with it.
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void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
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uint64_t Addr) {
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// The address to use for relocation resolution is not
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// the address of the local section buffer. We must be doing
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// a remote execution environment of some sort. Relocations can't
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// be applied until all the sections have been moved. The client must
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// trigger this with a call to MCJIT::finalize() or
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// RuntimeDyld::resolveRelocations().
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//
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// Addr is a uint64_t because we can't assume the pointer width
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// of the target is the same as that of the host. Just use a generic
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// "big enough" type.
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Sections[SectionID].LoadAddress = Addr;
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}
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void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
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uint64_t Value) {
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for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
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const RelocationEntry &RE = Relocs[i];
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// Ignore relocations for sections that were not loaded
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if (Sections[RE.SectionID].Address == 0)
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continue;
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resolveRelocation(RE, Value);
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}
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}
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void RuntimeDyldImpl::resolveExternalSymbols() {
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StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin(),
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e = ExternalSymbolRelocations.end();
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for (; i != e; i++) {
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StringRef Name = i->first();
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RelocationList &Relocs = i->second;
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SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
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if (Loc == GlobalSymbolTable.end()) {
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if (Name.size() == 0) {
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// This is an absolute symbol, use an address of zero.
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DEBUG(dbgs() << "Resolving absolute relocations." << "\n");
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resolveRelocationList(Relocs, 0);
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} else {
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// This is an external symbol, try to get its address from
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// MemoryManager.
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uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
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true);
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DEBUG(dbgs() << "Resolving relocations Name: " << Name
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<< "\t" << format("%p", Addr)
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<< "\n");
|
|
resolveRelocationList(Relocs, (uintptr_t)Addr);
|
|
}
|
|
} else {
|
|
report_fatal_error("Expected external symbol");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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;
|
|
}
|
|
|
|
RuntimeDyld::~RuntimeDyld() {
|
|
delete Dyld;
|
|
}
|
|
|
|
ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *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!");
|
|
}
|
|
|
|
return Dyld->loadObject(InputBuffer);
|
|
}
|
|
|
|
void *RuntimeDyld::getSymbolAddress(StringRef Name) {
|
|
return Dyld->getSymbolAddress(Name);
|
|
}
|
|
|
|
uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
|
|
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();
|
|
}
|
|
|
|
StringRef RuntimeDyld::getEHFrameSection() {
|
|
return Dyld->getEHFrameSection();
|
|
}
|
|
|
|
} // end namespace llvm
|