diff options
Diffstat (limited to 'contrib/llvm/lib/ExecutionEngine/RuntimeDyld')
17 files changed, 6983 insertions, 0 deletions
diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RTDyldMemoryManager.cpp b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RTDyldMemoryManager.cpp new file mode 100644 index 0000000..ecd9900 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RTDyldMemoryManager.cpp @@ -0,0 +1,294 @@ +//===-- RTDyldMemoryManager.cpp - Memory manager for MC-JIT -----*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// Implementation of the runtime dynamic memory manager base class. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Config/config.h" +#include "llvm/ExecutionEngine/RTDyldMemoryManager.h" +#include "llvm/Support/Compiler.h" +#include "llvm/Support/DynamicLibrary.h" +#include "llvm/Support/ErrorHandling.h" +#include <cstdlib> + +#ifdef __linux__ + // These includes used by RTDyldMemoryManager::getPointerToNamedFunction() + // for Glibc trickery. See comments in this function for more information. + #ifdef HAVE_SYS_STAT_H + #include <sys/stat.h> + #endif + #include <fcntl.h> + #include <unistd.h> +#endif + +namespace llvm { + +RTDyldMemoryManager::~RTDyldMemoryManager() {} + +// Determine whether we can register EH tables. +#if (defined(__GNUC__) && !defined(__ARM_EABI__) && !defined(__ia64__) && \ + !defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)) +#define HAVE_EHTABLE_SUPPORT 1 +#else +#define HAVE_EHTABLE_SUPPORT 0 +#endif + +#if HAVE_EHTABLE_SUPPORT +extern "C" void __register_frame(void *); +extern "C" void __deregister_frame(void *); +#else +// The building compiler does not have __(de)register_frame but +// it may be found at runtime in a dynamically-loaded library. +// For example, this happens when building LLVM with Visual C++ +// but using the MingW runtime. +void __register_frame(void *p) { + static bool Searched = false; + static void((*rf)(void *)) = 0; + + if (!Searched) { + Searched = true; + *(void **)&rf = + llvm::sys::DynamicLibrary::SearchForAddressOfSymbol("__register_frame"); + } + if (rf) + rf(p); +} + +void __deregister_frame(void *p) { + static bool Searched = false; + static void((*df)(void *)) = 0; + + if (!Searched) { + Searched = true; + *(void **)&df = llvm::sys::DynamicLibrary::SearchForAddressOfSymbol( + "__deregister_frame"); + } + if (df) + df(p); +} +#endif + +#ifdef __APPLE__ + +static const char *processFDE(const char *Entry, bool isDeregister) { + const char *P = Entry; + uint32_t Length = *((const uint32_t *)P); + P += 4; + uint32_t Offset = *((const uint32_t *)P); + if (Offset != 0) { + if (isDeregister) + __deregister_frame(const_cast<char *>(Entry)); + else + __register_frame(const_cast<char *>(Entry)); + } + return P + Length; +} + +// This implementation handles frame registration for local targets. +// Memory managers for remote targets should re-implement this function +// and use the LoadAddr parameter. +void RTDyldMemoryManager::registerEHFrames(uint8_t *Addr, + uint64_t LoadAddr, + size_t Size) { + // On OS X OS X __register_frame takes a single FDE as an argument. + // See http://lists.llvm.org/pipermail/llvm-dev/2013-April/061768.html + const char *P = (const char *)Addr; + const char *End = P + Size; + do { + P = processFDE(P, false); + } while(P != End); +} + +void RTDyldMemoryManager::deregisterEHFrames(uint8_t *Addr, + uint64_t LoadAddr, + size_t Size) { + const char *P = (const char *)Addr; + const char *End = P + Size; + do { + P = processFDE(P, true); + } while(P != End); +} + +#else + +void RTDyldMemoryManager::registerEHFrames(uint8_t *Addr, + uint64_t LoadAddr, + size_t Size) { + // On Linux __register_frame takes a single argument: + // a pointer to the start of the .eh_frame section. + + // How can it find the end? Because crtendS.o is linked + // in and it has an .eh_frame section with four zero chars. + __register_frame(Addr); +} + +void RTDyldMemoryManager::deregisterEHFrames(uint8_t *Addr, + uint64_t LoadAddr, + size_t Size) { + __deregister_frame(Addr); +} + +#endif + +static int jit_noop() { + return 0; +} + +// ARM math functions are statically linked on Android from libgcc.a, but not +// available at runtime for dynamic linking. On Linux these are usually placed +// in libgcc_s.so so can be found by normal dynamic lookup. +#if defined(__BIONIC__) && defined(__arm__) +// List of functions which are statically linked on Android and can be generated +// by LLVM. This is done as a nested macro which is used once to declare the +// imported functions with ARM_MATH_DECL and once to compare them to the +// user-requested symbol in getSymbolAddress with ARM_MATH_CHECK. The test +// assumes that all functions start with __aeabi_ and getSymbolAddress must be +// modified if that changes. +#define ARM_MATH_IMPORTS(PP) \ + PP(__aeabi_d2f) \ + PP(__aeabi_d2iz) \ + PP(__aeabi_d2lz) \ + PP(__aeabi_d2uiz) \ + PP(__aeabi_d2ulz) \ + PP(__aeabi_dadd) \ + PP(__aeabi_dcmpeq) \ + PP(__aeabi_dcmpge) \ + PP(__aeabi_dcmpgt) \ + PP(__aeabi_dcmple) \ + PP(__aeabi_dcmplt) \ + PP(__aeabi_dcmpun) \ + PP(__aeabi_ddiv) \ + PP(__aeabi_dmul) \ + PP(__aeabi_dsub) \ + PP(__aeabi_f2d) \ + PP(__aeabi_f2iz) \ + PP(__aeabi_f2lz) \ + PP(__aeabi_f2uiz) \ + PP(__aeabi_f2ulz) \ + PP(__aeabi_fadd) \ + PP(__aeabi_fcmpeq) \ + PP(__aeabi_fcmpge) \ + PP(__aeabi_fcmpgt) \ + PP(__aeabi_fcmple) \ + PP(__aeabi_fcmplt) \ + PP(__aeabi_fcmpun) \ + PP(__aeabi_fdiv) \ + PP(__aeabi_fmul) \ + PP(__aeabi_fsub) \ + PP(__aeabi_i2d) \ + PP(__aeabi_i2f) \ + PP(__aeabi_idiv) \ + PP(__aeabi_idivmod) \ + PP(__aeabi_l2d) \ + PP(__aeabi_l2f) \ + PP(__aeabi_lasr) \ + PP(__aeabi_ldivmod) \ + PP(__aeabi_llsl) \ + PP(__aeabi_llsr) \ + PP(__aeabi_lmul) \ + PP(__aeabi_ui2d) \ + PP(__aeabi_ui2f) \ + PP(__aeabi_uidiv) \ + PP(__aeabi_uidivmod) \ + PP(__aeabi_ul2d) \ + PP(__aeabi_ul2f) \ + PP(__aeabi_uldivmod) + +// Declare statically linked math functions on ARM. The function declarations +// here do not have the correct prototypes for each function in +// ARM_MATH_IMPORTS, but it doesn't matter because only the symbol addresses are +// needed. In particular the __aeabi_*divmod functions do not have calling +// conventions which match any C prototype. +#define ARM_MATH_DECL(name) extern "C" void name(); +ARM_MATH_IMPORTS(ARM_MATH_DECL) +#undef ARM_MATH_DECL +#endif + +#if defined(__linux__) && defined(__GLIBC__) && \ + (defined(__i386__) || defined(__x86_64__)) +extern "C" LLVM_ATTRIBUTE_WEAK void __morestack(); +#endif + +uint64_t +RTDyldMemoryManager::getSymbolAddressInProcess(const std::string &Name) { + // This implementation assumes that the host program is the target. + // Clients generating code for a remote target should implement their own + // memory manager. +#if defined(__linux__) && defined(__GLIBC__) + //===--------------------------------------------------------------------===// + // Function stubs that are invoked instead of certain library calls + // + // Force the following functions to be linked in to anything that uses the + // JIT. This is a hack designed to work around the all-too-clever Glibc + // strategy of making these functions work differently when inlined vs. when + // not inlined, and hiding their real definitions in a separate archive file + // that the dynamic linker can't see. For more info, search for + // 'libc_nonshared.a' on Google, or read http://llvm.org/PR274. + if (Name == "stat") return (uint64_t)&stat; + if (Name == "fstat") return (uint64_t)&fstat; + if (Name == "lstat") return (uint64_t)&lstat; + if (Name == "stat64") return (uint64_t)&stat64; + if (Name == "fstat64") return (uint64_t)&fstat64; + if (Name == "lstat64") return (uint64_t)&lstat64; + if (Name == "atexit") return (uint64_t)&atexit; + if (Name == "mknod") return (uint64_t)&mknod; + +#if defined(__i386__) || defined(__x86_64__) + // __morestack lives in libgcc, a static library. + if (&__morestack && Name == "__morestack") + return (uint64_t)&__morestack; +#endif +#endif // __linux__ && __GLIBC__ + + // See ARM_MATH_IMPORTS definition for explanation +#if defined(__BIONIC__) && defined(__arm__) + if (Name.compare(0, 8, "__aeabi_") == 0) { + // Check if the user has requested any of the functions listed in + // ARM_MATH_IMPORTS, and if so redirect to the statically linked symbol. +#define ARM_MATH_CHECK(fn) if (Name == #fn) return (uint64_t)&fn; + ARM_MATH_IMPORTS(ARM_MATH_CHECK) +#undef ARM_MATH_CHECK + } +#endif + + // We should not invoke parent's ctors/dtors from generated main()! + // On Mingw and Cygwin, the symbol __main is resolved to + // callee's(eg. tools/lli) one, to invoke wrong duplicated ctors + // (and register wrong callee's dtors with atexit(3)). + // We expect ExecutionEngine::runStaticConstructorsDestructors() + // is called before ExecutionEngine::runFunctionAsMain() is called. + if (Name == "__main") return (uint64_t)&jit_noop; + + // Try to demangle Name before looking it up in the process, otherwise symbol + // '_<Name>' (if present) will shadow '<Name>', and there will be no way to + // refer to the latter. + + const char *NameStr = Name.c_str(); + + if (NameStr[0] == '_') + if (void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr + 1)) + return (uint64_t)Ptr; + + // If we Name did not require demangling, or we failed to find the demangled + // name, try again without demangling. + return (uint64_t)sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr); +} + +void *RTDyldMemoryManager::getPointerToNamedFunction(const std::string &Name, + bool AbortOnFailure) { + uint64_t Addr = getSymbolAddress(Name); + + if (!Addr && AbortOnFailure) + report_fatal_error("Program used external function '" + Name + + "' which could not be resolved!"); + return (void*)Addr; +} + +} // namespace llvm diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp new file mode 100644 index 0000000..a95f3bb --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp @@ -0,0 +1,980 @@ +//===-- RuntimeDyld.cpp - Run-time dynamic linker for MC-JIT ----*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// Implementation of the MC-JIT runtime dynamic linker. +// +//===----------------------------------------------------------------------===// + +#include "llvm/ExecutionEngine/RuntimeDyld.h" +#include "RuntimeDyldCheckerImpl.h" +#include "RuntimeDyldCOFF.h" +#include "RuntimeDyldELF.h" +#include "RuntimeDyldImpl.h" +#include "RuntimeDyldMachO.h" +#include "llvm/Object/ELFObjectFile.h" +#include "llvm/Object/COFF.h" +#include "llvm/Support/MathExtras.h" +#include "llvm/Support/MutexGuard.h" + +using namespace llvm; +using namespace llvm::object; + +#define DEBUG_TYPE "dyld" + +// Empty out-of-line virtual destructor as the key function. +RuntimeDyldImpl::~RuntimeDyldImpl() {} + +// Pin LoadedObjectInfo's vtables to this file. +void RuntimeDyld::LoadedObjectInfo::anchor() {} + +namespace llvm { + +void RuntimeDyldImpl::registerEHFrames() {} + +void RuntimeDyldImpl::deregisterEHFrames() {} + +#ifndef NDEBUG +static void dumpSectionMemory(const SectionEntry &S, StringRef State) { + dbgs() << "----- Contents of section " << S.getName() << " " << State + << " -----"; + + if (S.getAddress() == nullptr) { + dbgs() << "\n <section not emitted>\n"; + return; + } + + const unsigned ColsPerRow = 16; + + uint8_t *DataAddr = S.getAddress(); + uint64_t LoadAddr = S.getLoadAddress(); + + unsigned StartPadding = LoadAddr & (ColsPerRow - 1); + unsigned BytesRemaining = S.getSize(); + + if (StartPadding) { + dbgs() << "\n" << format("0x%016" PRIx64, + LoadAddr & ~(uint64_t)(ColsPerRow - 1)) << ":"; + while (StartPadding--) + dbgs() << " "; + } + + while (BytesRemaining > 0) { + if ((LoadAddr & (ColsPerRow - 1)) == 0) + dbgs() << "\n" << format("0x%016" PRIx64, LoadAddr) << ":"; + + dbgs() << " " << format("%02x", *DataAddr); + + ++DataAddr; + ++LoadAddr; + --BytesRemaining; + } + + dbgs() << "\n"; +} +#endif + +// Resolve the relocations for all symbols we currently know about. +void RuntimeDyldImpl::resolveRelocations() { + MutexGuard locked(lock); + + // Print out the sections prior to relocation. + DEBUG( + for (int i = 0, e = Sections.size(); i != e; ++i) + dumpSectionMemory(Sections[i], "before relocations"); + ); + + // First, resolve relocations associated with external symbols. + resolveExternalSymbols(); + + // Iterate over all outstanding relocations + for (auto it = Relocations.begin(), e = Relocations.end(); it != e; ++it) { + // 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. + int Idx = it->first; + uint64_t Addr = Sections[Idx].getLoadAddress(); + DEBUG(dbgs() << "Resolving relocations Section #" << Idx << "\t" + << format("%p", (uintptr_t)Addr) << "\n"); + resolveRelocationList(it->second, Addr); + } + Relocations.clear(); + + // Print out sections after relocation. + DEBUG( + for (int i = 0, e = Sections.size(); i != e; ++i) + dumpSectionMemory(Sections[i], "after relocations"); + ); + +} + +void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress, + uint64_t TargetAddress) { + MutexGuard locked(lock); + for (unsigned i = 0, e = Sections.size(); i != e; ++i) { + if (Sections[i].getAddress() == LocalAddress) { + reassignSectionAddress(i, TargetAddress); + return; + } + } + llvm_unreachable("Attempting to remap address of unknown section!"); +} + +static std::error_code getOffset(const SymbolRef &Sym, SectionRef Sec, + uint64_t &Result) { + ErrorOr<uint64_t> AddressOrErr = Sym.getAddress(); + if (std::error_code EC = AddressOrErr.getError()) + return EC; + Result = *AddressOrErr - Sec.getAddress(); + return std::error_code(); +} + +RuntimeDyldImpl::ObjSectionToIDMap +RuntimeDyldImpl::loadObjectImpl(const object::ObjectFile &Obj) { + MutexGuard locked(lock); + + // Save information about our target + Arch = (Triple::ArchType)Obj.getArch(); + IsTargetLittleEndian = Obj.isLittleEndian(); + setMipsABI(Obj); + + // 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); + } + + // Used sections from the object file + ObjSectionToIDMap LocalSections; + + // Common symbols requiring allocation, with their sizes and alignments + CommonSymbolList CommonSymbols; + + // Parse symbols + DEBUG(dbgs() << "Parse symbols:\n"); + for (symbol_iterator I = Obj.symbol_begin(), E = Obj.symbol_end(); I != E; + ++I) { + uint32_t Flags = I->getFlags(); + + if (Flags & SymbolRef::SF_Common) + CommonSymbols.push_back(*I); + else { + object::SymbolRef::Type SymType = I->getType(); + + // Get symbol name. + ErrorOr<StringRef> NameOrErr = I->getName(); + Check(NameOrErr.getError()); + StringRef Name = *NameOrErr; + + // Compute JIT symbol flags. + JITSymbolFlags RTDyldSymFlags = JITSymbolFlags::None; + if (Flags & SymbolRef::SF_Weak) + RTDyldSymFlags |= JITSymbolFlags::Weak; + if (Flags & SymbolRef::SF_Exported) + RTDyldSymFlags |= JITSymbolFlags::Exported; + + if (Flags & SymbolRef::SF_Absolute && + SymType != object::SymbolRef::ST_File) { + auto Addr = I->getAddress(); + Check(Addr.getError()); + uint64_t SectOffset = *Addr; + unsigned SectionID = AbsoluteSymbolSection; + + DEBUG(dbgs() << "\tType: " << SymType << " (absolute) Name: " << Name + << " SID: " << SectionID << " Offset: " + << format("%p", (uintptr_t)SectOffset) + << " flags: " << Flags << "\n"); + GlobalSymbolTable[Name] = + SymbolTableEntry(SectionID, SectOffset, RTDyldSymFlags); + } else if (SymType == object::SymbolRef::ST_Function || + SymType == object::SymbolRef::ST_Data || + SymType == object::SymbolRef::ST_Unknown || + SymType == object::SymbolRef::ST_Other) { + + ErrorOr<section_iterator> SIOrErr = I->getSection(); + Check(SIOrErr.getError()); + section_iterator SI = *SIOrErr; + if (SI == Obj.section_end()) + continue; + // Get symbol offset. + uint64_t SectOffset; + Check(getOffset(*I, *SI, SectOffset)); + bool IsCode = SI->isText(); + unsigned SectionID = findOrEmitSection(Obj, *SI, IsCode, LocalSections); + + DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name + << " SID: " << SectionID << " Offset: " + << format("%p", (uintptr_t)SectOffset) + << " flags: " << Flags << "\n"); + GlobalSymbolTable[Name] = + SymbolTableEntry(SectionID, SectOffset, RTDyldSymFlags); + } + } + } + + // Allocate common symbols + emitCommonSymbols(Obj, CommonSymbols); + + // Parse and process relocations + DEBUG(dbgs() << "Parse relocations:\n"); + for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end(); + SI != SE; ++SI) { + unsigned SectionID = 0; + StubMap Stubs; + section_iterator RelocatedSection = SI->getRelocatedSection(); + + if (RelocatedSection == SE) + continue; + + relocation_iterator I = SI->relocation_begin(); + relocation_iterator E = SI->relocation_end(); + + if (I == E && !ProcessAllSections) + continue; + + bool IsCode = RelocatedSection->isText(); + SectionID = + findOrEmitSection(Obj, *RelocatedSection, IsCode, LocalSections); + DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n"); + + for (; I != E;) + I = processRelocationRef(SectionID, I, Obj, LocalSections, Stubs); + + // If there is an attached checker, notify it about the stubs for this + // section so that they can be verified. + if (Checker) + Checker->registerStubMap(Obj.getFileName(), SectionID, Stubs); + } + + // Give the subclasses a chance to tie-up any loose ends. + finalizeLoad(Obj, LocalSections); + +// for (auto E : LocalSections) +// llvm::dbgs() << "Added: " << E.first.getRawDataRefImpl() << " -> " << E.second << "\n"; + + return LocalSections; +} + +// 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; +} + +static bool isRequiredForExecution(const SectionRef Section) { + const ObjectFile *Obj = Section.getObject(); + if (isa<object::ELFObjectFileBase>(Obj)) + return ELFSectionRef(Section).getFlags() & ELF::SHF_ALLOC; + if (auto *COFFObj = dyn_cast<object::COFFObjectFile>(Obj)) { + const coff_section *CoffSection = COFFObj->getCOFFSection(Section); + // Avoid loading zero-sized COFF sections. + // In PE files, VirtualSize gives the section size, and SizeOfRawData + // may be zero for sections with content. In Obj files, SizeOfRawData + // gives the section size, and VirtualSize is always zero. Hence + // the need to check for both cases below. + bool HasContent = (CoffSection->VirtualSize > 0) + || (CoffSection->SizeOfRawData > 0); + bool IsDiscardable = CoffSection->Characteristics & + (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_LNK_INFO); + return HasContent && !IsDiscardable; + } + + assert(isa<MachOObjectFile>(Obj)); + return true; +} + +static bool isReadOnlyData(const SectionRef Section) { + const ObjectFile *Obj = Section.getObject(); + if (isa<object::ELFObjectFileBase>(Obj)) + return !(ELFSectionRef(Section).getFlags() & + (ELF::SHF_WRITE | ELF::SHF_EXECINSTR)); + if (auto *COFFObj = dyn_cast<object::COFFObjectFile>(Obj)) + return ((COFFObj->getCOFFSection(Section)->Characteristics & + (COFF::IMAGE_SCN_CNT_INITIALIZED_DATA + | COFF::IMAGE_SCN_MEM_READ + | COFF::IMAGE_SCN_MEM_WRITE)) + == + (COFF::IMAGE_SCN_CNT_INITIALIZED_DATA + | COFF::IMAGE_SCN_MEM_READ)); + + assert(isa<MachOObjectFile>(Obj)); + return false; +} + +static bool isZeroInit(const SectionRef Section) { + const ObjectFile *Obj = Section.getObject(); + if (isa<object::ELFObjectFileBase>(Obj)) + return ELFSectionRef(Section).getType() == ELF::SHT_NOBITS; + if (auto *COFFObj = dyn_cast<object::COFFObjectFile>(Obj)) + return COFFObj->getCOFFSection(Section)->Characteristics & + COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; + + auto *MachO = cast<MachOObjectFile>(Obj); + unsigned SectionType = MachO->getSectionType(Section); + return SectionType == MachO::S_ZEROFILL || + SectionType == MachO::S_GB_ZEROFILL; +} + +// Compute an upper bound of the memory size that is required to load all +// sections +void RuntimeDyldImpl::computeTotalAllocSize(const ObjectFile &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.section_begin(), SE = Obj.section_end(); + SI != SE; ++SI) { + const SectionRef &Section = *SI; + + bool IsRequired = isRequiredForExecution(Section); + + // Consider only the sections that are required to be loaded for execution + if (IsRequired) { + StringRef Name; + uint64_t DataSize = Section.getSize(); + uint64_t Alignment64 = Section.getAlignment(); + bool IsCode = Section.isText(); + bool IsReadOnly = isReadOnlyData(Section); + 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) + SectionSize = 1; + + 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.symbol_begin(), E = Obj.symbol_end(); 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 = I->getCommonSize(); + 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(const ObjectFile &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.section_begin(), SE = Obj.section_end(); + SI != SE; ++SI) { + section_iterator RelSecI = SI->getRelocatedSection(); + if (!(RelSecI == Section)) + continue; + + for (const RelocationRef &Reloc : SI->relocations()) + if (relocationNeedsStub(Reloc)) + StubBufSize += StubSize; + } + + // Get section data size and alignment + uint64_t DataSize = Section.getSize(); + uint64_t Alignment64 = Section.getAlignment(); + + // 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; +} + +uint64_t RuntimeDyldImpl::readBytesUnaligned(uint8_t *Src, + unsigned Size) const { + uint64_t Result = 0; + if (IsTargetLittleEndian) { + Src += Size - 1; + while (Size--) + Result = (Result << 8) | *Src--; + } else + while (Size--) + Result = (Result << 8) | *Src++; + + return Result; +} + +void RuntimeDyldImpl::writeBytesUnaligned(uint64_t Value, uint8_t *Dst, + unsigned Size) const { + if (IsTargetLittleEndian) { + while (Size--) { + *Dst++ = Value & 0xFF; + Value >>= 8; + } + } else { + Dst += Size - 1; + while (Size--) { + *Dst-- = Value & 0xFF; + Value >>= 8; + } + } +} + +void RuntimeDyldImpl::emitCommonSymbols(const ObjectFile &Obj, + CommonSymbolList &CommonSymbols) { + if (CommonSymbols.empty()) + return; + + uint64_t CommonSize = 0; + CommonSymbolList SymbolsToAllocate; + + DEBUG(dbgs() << "Processing common symbols...\n"); + + for (const auto &Sym : CommonSymbols) { + ErrorOr<StringRef> NameOrErr = Sym.getName(); + Check(NameOrErr.getError()); + StringRef Name = *NameOrErr; + + // Skip common symbols already elsewhere. + if (GlobalSymbolTable.count(Name) || + Resolver.findSymbolInLogicalDylib(Name)) { + DEBUG(dbgs() << "\tSkipping already emitted common symbol '" << Name + << "'\n"); + continue; + } + + uint32_t Align = Sym.getAlignment(); + uint64_t Size = Sym.getCommonSize(); + + CommonSize += Align + Size; + SymbolsToAllocate.push_back(Sym); + } + + // Allocate memory for the section + unsigned SectionID = Sections.size(); + uint8_t *Addr = MemMgr.allocateDataSection(CommonSize, 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("<common symbols>", Addr, CommonSize, CommonSize, 0)); + memset(Addr, 0, CommonSize); + + DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID << " new addr: " + << format("%p", Addr) << " DataSize: " << CommonSize << "\n"); + + // Assign the address of each symbol + for (auto &Sym : SymbolsToAllocate) { + uint32_t Align = Sym.getAlignment(); + uint64_t Size = Sym.getCommonSize(); + ErrorOr<StringRef> NameOrErr = Sym.getName(); + Check(NameOrErr.getError()); + StringRef Name = *NameOrErr; + if (Align) { + // This symbol has an alignment requirement. + uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align); + Addr += AlignOffset; + Offset += AlignOffset; + } + uint32_t Flags = Sym.getFlags(); + JITSymbolFlags RTDyldSymFlags = JITSymbolFlags::None; + if (Flags & SymbolRef::SF_Weak) + RTDyldSymFlags |= JITSymbolFlags::Weak; + if (Flags & SymbolRef::SF_Exported) + RTDyldSymFlags |= JITSymbolFlags::Exported; + DEBUG(dbgs() << "Allocating common symbol " << Name << " address " + << format("%p", Addr) << "\n"); + GlobalSymbolTable[Name] = + SymbolTableEntry(SectionID, Offset, RTDyldSymFlags); + Offset += Size; + Addr += Size; + } + + if (Checker) + Checker->registerSection(Obj.getFileName(), SectionID); +} + +unsigned RuntimeDyldImpl::emitSection(const ObjectFile &Obj, + const SectionRef &Section, bool IsCode) { + + StringRef data; + uint64_t Alignment64 = Section.getAlignment(); + + unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL; + unsigned PaddingSize = 0; + unsigned StubBufSize = 0; + StringRef Name; + bool IsRequired = isRequiredForExecution(Section); + bool IsVirtual = Section.isVirtual(); + bool IsZeroInit = isZeroInit(Section); + bool IsReadOnly = isReadOnlyData(Section); + uint64_t DataSize = Section.getSize(); + 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 = nullptr; + + // If this section contains any bits (i.e. isn't a virtual or bss section), + // grab a reference to them. + if (!IsVirtual && !IsZeroInit) { + // In either case, set the location of the unrelocated section in memory, + // since we still process relocations for it even if we're not applying them. + Check(Section.getContents(data)); + pData = data.data(); + } + + // Code section alignment needs to be at least as high as stub alignment or + // padding calculations may by incorrect when the section is remapped to a + // higher alignment. + if (IsCode) + Alignment = std::max(Alignment, getStubAlignment()); + + // 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; + if (!Allocate) + Allocate = 1; + 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!"); + + // 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"); + } 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 = nullptr; + 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, Allocate, (uintptr_t)pData)); + + if (Checker) + Checker->registerSection(Obj.getFileName(), SectionID); + + return SectionID; +} + +unsigned RuntimeDyldImpl::findOrEmitSection(const ObjectFile &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. + RTDyldSymbolTable::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; + const auto &SymInfo = Loc->second; + RECopy.Addend += SymInfo.getOffset(); + Relocations[SymInfo.getSectionID()].push_back(RECopy); + } +} + +uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr, + unsigned AbiVariant) { + 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. + // Stub can use ip0 (== x16) to calculate address + writeBytesUnaligned(0xd2e00010, Addr, 4); // movz ip0, #:abs_g3:<addr> + writeBytesUnaligned(0xf2c00010, Addr+4, 4); // movk ip0, #:abs_g2_nc:<addr> + writeBytesUnaligned(0xf2a00010, Addr+8, 4); // movk ip0, #:abs_g1_nc:<addr> + writeBytesUnaligned(0xf2800010, Addr+12, 4); // movk ip0, #:abs_g0_nc:<addr> + writeBytesUnaligned(0xd61f0200, Addr+16, 4); // 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. + writeBytesUnaligned(0xe51ff004, Addr, 4); // ldr pc,<label> + return Addr + 4; + } else if (IsMipsO32ABI) { + // 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; + + writeBytesUnaligned(LuiT9Instr, Addr, 4); + writeBytesUnaligned(AdduiT9Instr, Addr+4, 4); + writeBytesUnaligned(JrT9Instr, Addr+8, 4); + writeBytesUnaligned(NopInstr, Addr+12, 4); + return Addr; + } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) { + // Depending on which version of the ELF ABI is in use, we need to + // generate one of two variants of the stub. They both start with + // the same sequence to load the target address into r12. + 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) + if (AbiVariant == 2) { + // PowerPC64 stub ELFv2 ABI: The address points to the function itself. + // The address is already in r12 as required by the ABI. Branch to it. + writeInt32BE(Addr+20, 0xF8410018); // std r2, 24(r1) + writeInt32BE(Addr+24, 0x7D8903A6); // mtctr r12 + writeInt32BE(Addr+28, 0x4E800420); // bctr + } else { + // PowerPC64 stub ELFv1 ABI: The address points to a function descriptor. + // 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+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. + DEBUG(dbgs() << "Reassigning address for section " << SectionID << " (" + << Sections[SectionID].getName() << "): " + << format("0x%016" PRIx64, Sections[SectionID].getLoadAddress()) + << " -> " << format("0x%016" PRIx64, Addr) << "\n"); + Sections[SectionID].setLoadAddress(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].getAddress() == 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; + RTDyldSymbolTable::const_iterator Loc = GlobalSymbolTable.find(Name); + if (Loc == GlobalSymbolTable.end()) { + // This is an external symbol, try to get its address from the symbol + // resolver. + Addr = Resolver.findSymbol(Name.data()).getAddress(); + // 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. + const auto &SymInfo = Loc->second; + Addr = getSectionLoadAddress(SymInfo.getSectionID()) + + SymInfo.getOffset(); + } + + // 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!"); + + // If Resolver returned UINT64_MAX, the client wants to handle this symbol + // manually and we shouldn't resolve its relocations. + if (Addr != UINT64_MAX) { + 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 + +uint64_t RuntimeDyld::LoadedObjectInfo::getSectionLoadAddress( + const object::SectionRef &Sec) const { + + auto I = ObjSecToIDMap.find(Sec); + if (I != ObjSecToIDMap.end()) + return RTDyld.Sections[I->second].getLoadAddress(); + + return 0; +} + +void RuntimeDyld::MemoryManager::anchor() {} +void RuntimeDyld::SymbolResolver::anchor() {} + +RuntimeDyld::RuntimeDyld(RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver) + : MemMgr(MemMgr), Resolver(Resolver) { + // 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; + ProcessAllSections = false; + Checker = nullptr; +} + +RuntimeDyld::~RuntimeDyld() {} + +static std::unique_ptr<RuntimeDyldCOFF> +createRuntimeDyldCOFF(Triple::ArchType Arch, RuntimeDyld::MemoryManager &MM, + RuntimeDyld::SymbolResolver &Resolver, + bool ProcessAllSections, RuntimeDyldCheckerImpl *Checker) { + std::unique_ptr<RuntimeDyldCOFF> Dyld = + RuntimeDyldCOFF::create(Arch, MM, Resolver); + Dyld->setProcessAllSections(ProcessAllSections); + Dyld->setRuntimeDyldChecker(Checker); + return Dyld; +} + +static std::unique_ptr<RuntimeDyldELF> +createRuntimeDyldELF(RuntimeDyld::MemoryManager &MM, + RuntimeDyld::SymbolResolver &Resolver, + bool ProcessAllSections, RuntimeDyldCheckerImpl *Checker) { + std::unique_ptr<RuntimeDyldELF> Dyld(new RuntimeDyldELF(MM, Resolver)); + Dyld->setProcessAllSections(ProcessAllSections); + Dyld->setRuntimeDyldChecker(Checker); + return Dyld; +} + +static std::unique_ptr<RuntimeDyldMachO> +createRuntimeDyldMachO(Triple::ArchType Arch, RuntimeDyld::MemoryManager &MM, + RuntimeDyld::SymbolResolver &Resolver, + bool ProcessAllSections, + RuntimeDyldCheckerImpl *Checker) { + std::unique_ptr<RuntimeDyldMachO> Dyld = + RuntimeDyldMachO::create(Arch, MM, Resolver); + Dyld->setProcessAllSections(ProcessAllSections); + Dyld->setRuntimeDyldChecker(Checker); + return Dyld; +} + +std::unique_ptr<RuntimeDyld::LoadedObjectInfo> +RuntimeDyld::loadObject(const ObjectFile &Obj) { + if (!Dyld) { + if (Obj.isELF()) + Dyld = createRuntimeDyldELF(MemMgr, Resolver, ProcessAllSections, Checker); + else if (Obj.isMachO()) + Dyld = createRuntimeDyldMachO( + static_cast<Triple::ArchType>(Obj.getArch()), MemMgr, Resolver, + ProcessAllSections, Checker); + else if (Obj.isCOFF()) + Dyld = createRuntimeDyldCOFF( + static_cast<Triple::ArchType>(Obj.getArch()), MemMgr, Resolver, + ProcessAllSections, Checker); + else + report_fatal_error("Incompatible object format!"); + } + + if (!Dyld->isCompatibleFile(Obj)) + report_fatal_error("Incompatible object format!"); + + return Dyld->loadObject(Obj); +} + +void *RuntimeDyld::getSymbolLocalAddress(StringRef Name) const { + if (!Dyld) + return nullptr; + return Dyld->getSymbolLocalAddress(Name); +} + +RuntimeDyld::SymbolInfo RuntimeDyld::getSymbol(StringRef Name) const { + if (!Dyld) + return nullptr; + return Dyld->getSymbol(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 diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp new file mode 100644 index 0000000..e5fab92 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp @@ -0,0 +1,72 @@ +//===-- RuntimeDyldCOFF.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-==// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// Implementation of COFF support for the MC-JIT runtime dynamic linker. +// +//===----------------------------------------------------------------------===// + +#include "RuntimeDyldCOFF.h" +#include "Targets/RuntimeDyldCOFFI386.h" +#include "Targets/RuntimeDyldCOFFX86_64.h" +#include "llvm/ADT/STLExtras.h" +#include "llvm/ADT/Triple.h" +#include "llvm/Object/ObjectFile.h" + +using namespace llvm; +using namespace llvm::object; + +#define DEBUG_TYPE "dyld" + +namespace { + +class LoadedCOFFObjectInfo final + : public RuntimeDyld::LoadedObjectInfoHelper<LoadedCOFFObjectInfo> { +public: + LoadedCOFFObjectInfo(RuntimeDyldImpl &RTDyld, ObjSectionToIDMap ObjSecToIDMap) + : LoadedObjectInfoHelper(RTDyld, std::move(ObjSecToIDMap)) {} + + OwningBinary<ObjectFile> + getObjectForDebug(const ObjectFile &Obj) const override { + return OwningBinary<ObjectFile>(); + } +}; +} + +namespace llvm { + +std::unique_ptr<RuntimeDyldCOFF> +llvm::RuntimeDyldCOFF::create(Triple::ArchType Arch, + RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver) { + switch (Arch) { + default: + llvm_unreachable("Unsupported target for RuntimeDyldCOFF."); + break; + case Triple::x86: + return make_unique<RuntimeDyldCOFFI386>(MemMgr, Resolver); + case Triple::x86_64: + return make_unique<RuntimeDyldCOFFX86_64>(MemMgr, Resolver); + } +} + +std::unique_ptr<RuntimeDyld::LoadedObjectInfo> +RuntimeDyldCOFF::loadObject(const object::ObjectFile &O) { + return llvm::make_unique<LoadedCOFFObjectInfo>(*this, loadObjectImpl(O)); +} + +uint64_t RuntimeDyldCOFF::getSymbolOffset(const SymbolRef &Sym) { + // The value in a relocatable COFF object is the offset. + return Sym.getValue(); +} + +bool RuntimeDyldCOFF::isCompatibleFile(const object::ObjectFile &Obj) const { + return Obj.isCOFF(); +} + +} // namespace llvm diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.h new file mode 100644 index 0000000..32b8fa2 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.h @@ -0,0 +1,50 @@ +//===-- RuntimeDyldCOFF.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-==// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// COFF support for MC-JIT runtime dynamic linker. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_RUNTIME_DYLD_COFF_H +#define LLVM_RUNTIME_DYLD_COFF_H + +#include "RuntimeDyldImpl.h" +#include "llvm/ADT/DenseMap.h" + +#define DEBUG_TYPE "dyld" + +using namespace llvm; + +namespace llvm { + +// Common base class for COFF dynamic linker support. +// Concrete subclasses for each target can be found in ./Targets. +class RuntimeDyldCOFF : public RuntimeDyldImpl { + +public: + std::unique_ptr<RuntimeDyld::LoadedObjectInfo> + loadObject(const object::ObjectFile &Obj) override; + bool isCompatibleFile(const object::ObjectFile &Obj) const override; + + static std::unique_ptr<RuntimeDyldCOFF> + create(Triple::ArchType Arch, RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver); + +protected: + RuntimeDyldCOFF(RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldImpl(MemMgr, Resolver) {} + uint64_t getSymbolOffset(const SymbolRef &Sym); +}; + +} // end namespace llvm + +#undef DEBUG_TYPE + +#endif diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp new file mode 100644 index 0000000..58ce88a --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp @@ -0,0 +1,935 @@ +//===--- RuntimeDyldChecker.cpp - RuntimeDyld tester framework --*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "llvm/ADT/STLExtras.h" +#include "RuntimeDyldCheckerImpl.h" +#include "RuntimeDyldImpl.h" +#include "llvm/ExecutionEngine/RuntimeDyldChecker.h" +#include "llvm/MC/MCContext.h" +#include "llvm/MC/MCDisassembler.h" +#include "llvm/MC/MCInst.h" +#include "llvm/Support/Path.h" +#include <cctype> +#include <memory> + +#define DEBUG_TYPE "rtdyld" + +using namespace llvm; + +namespace llvm { + +// Helper class that implements the language evaluated by RuntimeDyldChecker. +class RuntimeDyldCheckerExprEval { +public: + RuntimeDyldCheckerExprEval(const RuntimeDyldCheckerImpl &Checker, + raw_ostream &ErrStream) + : Checker(Checker) {} + + bool evaluate(StringRef Expr) const { + // Expect equality expression of the form 'LHS = RHS'. + Expr = Expr.trim(); + size_t EQIdx = Expr.find('='); + + ParseContext OutsideLoad(false); + + // Evaluate LHS. + StringRef LHSExpr = Expr.substr(0, EQIdx).rtrim(); + StringRef RemainingExpr; + EvalResult LHSResult; + std::tie(LHSResult, RemainingExpr) = + evalComplexExpr(evalSimpleExpr(LHSExpr, OutsideLoad), OutsideLoad); + if (LHSResult.hasError()) + return handleError(Expr, LHSResult); + if (RemainingExpr != "") + return handleError(Expr, unexpectedToken(RemainingExpr, LHSExpr, "")); + + // Evaluate RHS. + StringRef RHSExpr = Expr.substr(EQIdx + 1).ltrim(); + EvalResult RHSResult; + std::tie(RHSResult, RemainingExpr) = + evalComplexExpr(evalSimpleExpr(RHSExpr, OutsideLoad), OutsideLoad); + if (RHSResult.hasError()) + return handleError(Expr, RHSResult); + if (RemainingExpr != "") + return handleError(Expr, unexpectedToken(RemainingExpr, RHSExpr, "")); + + if (LHSResult.getValue() != RHSResult.getValue()) { + Checker.ErrStream << "Expression '" << Expr << "' is false: " + << format("0x%" PRIx64, LHSResult.getValue()) + << " != " << format("0x%" PRIx64, RHSResult.getValue()) + << "\n"; + return false; + } + return true; + } + +private: + // RuntimeDyldCheckerExprEval requires some context when parsing exprs. In + // particular, it needs to know whether a symbol is being evaluated in the + // context of a load, in which case we want the linker's local address for + // the symbol, or outside of a load, in which case we want the symbol's + // address in the remote target. + + struct ParseContext { + bool IsInsideLoad; + ParseContext(bool IsInsideLoad) : IsInsideLoad(IsInsideLoad) {} + }; + + const RuntimeDyldCheckerImpl &Checker; + + enum class BinOpToken : unsigned { + Invalid, + Add, + Sub, + BitwiseAnd, + BitwiseOr, + ShiftLeft, + ShiftRight + }; + + class EvalResult { + public: + EvalResult() : Value(0), ErrorMsg("") {} + EvalResult(uint64_t Value) : Value(Value), ErrorMsg("") {} + EvalResult(std::string ErrorMsg) : Value(0), ErrorMsg(ErrorMsg) {} + uint64_t getValue() const { return Value; } + bool hasError() const { return ErrorMsg != ""; } + const std::string &getErrorMsg() const { return ErrorMsg; } + + private: + uint64_t Value; + std::string ErrorMsg; + }; + + StringRef getTokenForError(StringRef Expr) const { + if (Expr.empty()) + return ""; + + StringRef Token, Remaining; + if (isalpha(Expr[0])) + std::tie(Token, Remaining) = parseSymbol(Expr); + else if (isdigit(Expr[0])) + std::tie(Token, Remaining) = parseNumberString(Expr); + else { + unsigned TokLen = 1; + if (Expr.startswith("<<") || Expr.startswith(">>")) + TokLen = 2; + Token = Expr.substr(0, TokLen); + } + return Token; + } + + EvalResult unexpectedToken(StringRef TokenStart, StringRef SubExpr, + StringRef ErrText) const { + std::string ErrorMsg("Encountered unexpected token '"); + ErrorMsg += getTokenForError(TokenStart); + if (SubExpr != "") { + ErrorMsg += "' while parsing subexpression '"; + ErrorMsg += SubExpr; + } + ErrorMsg += "'"; + if (ErrText != "") { + ErrorMsg += " "; + ErrorMsg += ErrText; + } + return EvalResult(std::move(ErrorMsg)); + } + + bool handleError(StringRef Expr, const EvalResult &R) const { + assert(R.hasError() && "Not an error result."); + Checker.ErrStream << "Error evaluating expression '" << Expr + << "': " << R.getErrorMsg() << "\n"; + return false; + } + + std::pair<BinOpToken, StringRef> parseBinOpToken(StringRef Expr) const { + if (Expr.empty()) + return std::make_pair(BinOpToken::Invalid, ""); + + // Handle the two 2-character tokens. + if (Expr.startswith("<<")) + return std::make_pair(BinOpToken::ShiftLeft, Expr.substr(2).ltrim()); + if (Expr.startswith(">>")) + return std::make_pair(BinOpToken::ShiftRight, Expr.substr(2).ltrim()); + + // Handle one-character tokens. + BinOpToken Op; + switch (Expr[0]) { + default: + return std::make_pair(BinOpToken::Invalid, Expr); + case '+': + Op = BinOpToken::Add; + break; + case '-': + Op = BinOpToken::Sub; + break; + case '&': + Op = BinOpToken::BitwiseAnd; + break; + case '|': + Op = BinOpToken::BitwiseOr; + break; + } + + return std::make_pair(Op, Expr.substr(1).ltrim()); + } + + EvalResult computeBinOpResult(BinOpToken Op, const EvalResult &LHSResult, + const EvalResult &RHSResult) const { + switch (Op) { + default: + llvm_unreachable("Tried to evaluate unrecognized operation."); + case BinOpToken::Add: + return EvalResult(LHSResult.getValue() + RHSResult.getValue()); + case BinOpToken::Sub: + return EvalResult(LHSResult.getValue() - RHSResult.getValue()); + case BinOpToken::BitwiseAnd: + return EvalResult(LHSResult.getValue() & RHSResult.getValue()); + case BinOpToken::BitwiseOr: + return EvalResult(LHSResult.getValue() | RHSResult.getValue()); + case BinOpToken::ShiftLeft: + return EvalResult(LHSResult.getValue() << RHSResult.getValue()); + case BinOpToken::ShiftRight: + return EvalResult(LHSResult.getValue() >> RHSResult.getValue()); + } + } + + // Parse a symbol and return a (string, string) pair representing the symbol + // name and expression remaining to be parsed. + std::pair<StringRef, StringRef> parseSymbol(StringRef Expr) const { + size_t FirstNonSymbol = Expr.find_first_not_of("0123456789" + "abcdefghijklmnopqrstuvwxyz" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + ":_.$"); + return std::make_pair(Expr.substr(0, FirstNonSymbol), + Expr.substr(FirstNonSymbol).ltrim()); + } + + // Evaluate a call to decode_operand. Decode the instruction operand at the + // given symbol and get the value of the requested operand. + // Returns an error if the instruction cannot be decoded, or the requested + // operand is not an immediate. + // On success, retuns a pair containing the value of the operand, plus + // the expression remaining to be evaluated. + std::pair<EvalResult, StringRef> evalDecodeOperand(StringRef Expr) const { + if (!Expr.startswith("(")) + return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), ""); + StringRef RemainingExpr = Expr.substr(1).ltrim(); + StringRef Symbol; + std::tie(Symbol, RemainingExpr) = parseSymbol(RemainingExpr); + + if (!Checker.isSymbolValid(Symbol)) + return std::make_pair( + EvalResult(("Cannot decode unknown symbol '" + Symbol + "'").str()), + ""); + + if (!RemainingExpr.startswith(",")) + return std::make_pair( + unexpectedToken(RemainingExpr, RemainingExpr, "expected ','"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + EvalResult OpIdxExpr; + std::tie(OpIdxExpr, RemainingExpr) = evalNumberExpr(RemainingExpr); + if (OpIdxExpr.hasError()) + return std::make_pair(OpIdxExpr, ""); + + if (!RemainingExpr.startswith(")")) + return std::make_pair( + unexpectedToken(RemainingExpr, RemainingExpr, "expected ')'"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + MCInst Inst; + uint64_t Size; + if (!decodeInst(Symbol, Inst, Size)) + return std::make_pair( + EvalResult(("Couldn't decode instruction at '" + Symbol + "'").str()), + ""); + + unsigned OpIdx = OpIdxExpr.getValue(); + if (OpIdx >= Inst.getNumOperands()) { + std::string ErrMsg; + raw_string_ostream ErrMsgStream(ErrMsg); + ErrMsgStream << "Invalid operand index '" << format("%i", OpIdx) + << "' for instruction '" << Symbol + << "'. Instruction has only " + << format("%i", Inst.getNumOperands()) + << " operands.\nInstruction is:\n "; + Inst.dump_pretty(ErrMsgStream, Checker.InstPrinter); + return std::make_pair(EvalResult(ErrMsgStream.str()), ""); + } + + const MCOperand &Op = Inst.getOperand(OpIdx); + if (!Op.isImm()) { + std::string ErrMsg; + raw_string_ostream ErrMsgStream(ErrMsg); + ErrMsgStream << "Operand '" << format("%i", OpIdx) << "' of instruction '" + << Symbol << "' is not an immediate.\nInstruction is:\n "; + Inst.dump_pretty(ErrMsgStream, Checker.InstPrinter); + + return std::make_pair(EvalResult(ErrMsgStream.str()), ""); + } + + return std::make_pair(EvalResult(Op.getImm()), RemainingExpr); + } + + // Evaluate a call to next_pc. + // Decode the instruction at the given symbol and return the following program + // counter. + // Returns an error if the instruction cannot be decoded. + // On success, returns a pair containing the next PC, plus of the + // expression remaining to be evaluated. + std::pair<EvalResult, StringRef> evalNextPC(StringRef Expr, + ParseContext PCtx) const { + if (!Expr.startswith("(")) + return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), ""); + StringRef RemainingExpr = Expr.substr(1).ltrim(); + StringRef Symbol; + std::tie(Symbol, RemainingExpr) = parseSymbol(RemainingExpr); + + if (!Checker.isSymbolValid(Symbol)) + return std::make_pair( + EvalResult(("Cannot decode unknown symbol '" + Symbol + "'").str()), + ""); + + if (!RemainingExpr.startswith(")")) + return std::make_pair( + unexpectedToken(RemainingExpr, RemainingExpr, "expected ')'"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + MCInst Inst; + uint64_t InstSize; + if (!decodeInst(Symbol, Inst, InstSize)) + return std::make_pair( + EvalResult(("Couldn't decode instruction at '" + Symbol + "'").str()), + ""); + + uint64_t SymbolAddr = PCtx.IsInsideLoad + ? Checker.getSymbolLocalAddr(Symbol) + : Checker.getSymbolRemoteAddr(Symbol); + uint64_t NextPC = SymbolAddr + InstSize; + + return std::make_pair(EvalResult(NextPC), RemainingExpr); + } + + // Evaluate a call to stub_addr. + // Look up and return the address of the stub for the given + // (<file name>, <section name>, <symbol name>) tuple. + // On success, returns a pair containing the stub address, plus the expression + // remaining to be evaluated. + std::pair<EvalResult, StringRef> evalStubAddr(StringRef Expr, + ParseContext PCtx) const { + if (!Expr.startswith("(")) + return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), ""); + StringRef RemainingExpr = Expr.substr(1).ltrim(); + + // Handle file-name specially, as it may contain characters that aren't + // legal for symbols. + StringRef FileName; + size_t ComaIdx = RemainingExpr.find(','); + FileName = RemainingExpr.substr(0, ComaIdx).rtrim(); + RemainingExpr = RemainingExpr.substr(ComaIdx).ltrim(); + + if (!RemainingExpr.startswith(",")) + return std::make_pair( + unexpectedToken(RemainingExpr, Expr, "expected ','"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + StringRef SectionName; + std::tie(SectionName, RemainingExpr) = parseSymbol(RemainingExpr); + + if (!RemainingExpr.startswith(",")) + return std::make_pair( + unexpectedToken(RemainingExpr, Expr, "expected ','"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + StringRef Symbol; + std::tie(Symbol, RemainingExpr) = parseSymbol(RemainingExpr); + + if (!RemainingExpr.startswith(")")) + return std::make_pair( + unexpectedToken(RemainingExpr, Expr, "expected ')'"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + uint64_t StubAddr; + std::string ErrorMsg = ""; + std::tie(StubAddr, ErrorMsg) = Checker.getStubAddrFor( + FileName, SectionName, Symbol, PCtx.IsInsideLoad); + + if (ErrorMsg != "") + return std::make_pair(EvalResult(ErrorMsg), ""); + + return std::make_pair(EvalResult(StubAddr), RemainingExpr); + } + + std::pair<EvalResult, StringRef> evalSectionAddr(StringRef Expr, + ParseContext PCtx) const { + if (!Expr.startswith("(")) + return std::make_pair(unexpectedToken(Expr, Expr, "expected '('"), ""); + StringRef RemainingExpr = Expr.substr(1).ltrim(); + + // Handle file-name specially, as it may contain characters that aren't + // legal for symbols. + StringRef FileName; + size_t ComaIdx = RemainingExpr.find(','); + FileName = RemainingExpr.substr(0, ComaIdx).rtrim(); + RemainingExpr = RemainingExpr.substr(ComaIdx).ltrim(); + + if (!RemainingExpr.startswith(",")) + return std::make_pair( + unexpectedToken(RemainingExpr, Expr, "expected ','"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + StringRef SectionName; + std::tie(SectionName, RemainingExpr) = parseSymbol(RemainingExpr); + + if (!RemainingExpr.startswith(")")) + return std::make_pair( + unexpectedToken(RemainingExpr, Expr, "expected ')'"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + uint64_t StubAddr; + std::string ErrorMsg = ""; + std::tie(StubAddr, ErrorMsg) = Checker.getSectionAddr( + FileName, SectionName, PCtx.IsInsideLoad); + + if (ErrorMsg != "") + return std::make_pair(EvalResult(ErrorMsg), ""); + + return std::make_pair(EvalResult(StubAddr), RemainingExpr); + } + + // Evaluate an identiefer expr, which may be a symbol, or a call to + // one of the builtin functions: get_insn_opcode or get_insn_length. + // Return the result, plus the expression remaining to be parsed. + std::pair<EvalResult, StringRef> evalIdentifierExpr(StringRef Expr, + ParseContext PCtx) const { + StringRef Symbol; + StringRef RemainingExpr; + std::tie(Symbol, RemainingExpr) = parseSymbol(Expr); + + // Check for builtin function calls. + if (Symbol == "decode_operand") + return evalDecodeOperand(RemainingExpr); + else if (Symbol == "next_pc") + return evalNextPC(RemainingExpr, PCtx); + else if (Symbol == "stub_addr") + return evalStubAddr(RemainingExpr, PCtx); + else if (Symbol == "section_addr") + return evalSectionAddr(RemainingExpr, PCtx); + + if (!Checker.isSymbolValid(Symbol)) { + std::string ErrMsg("No known address for symbol '"); + ErrMsg += Symbol; + ErrMsg += "'"; + if (Symbol.startswith("L")) + ErrMsg += " (this appears to be an assembler local label - " + " perhaps drop the 'L'?)"; + + return std::make_pair(EvalResult(ErrMsg), ""); + } + + // The value for the symbol depends on the context we're evaluating in: + // Inside a load this is the address in the linker's memory, outside a + // load it's the address in the target processes memory. + uint64_t Value = PCtx.IsInsideLoad ? Checker.getSymbolLocalAddr(Symbol) + : Checker.getSymbolRemoteAddr(Symbol); + + // Looks like a plain symbol reference. + return std::make_pair(EvalResult(Value), RemainingExpr); + } + + // Parse a number (hexadecimal or decimal) and return a (string, string) + // pair representing the number and the expression remaining to be parsed. + std::pair<StringRef, StringRef> parseNumberString(StringRef Expr) const { + size_t FirstNonDigit = StringRef::npos; + if (Expr.startswith("0x")) { + FirstNonDigit = Expr.find_first_not_of("0123456789abcdefABCDEF", 2); + if (FirstNonDigit == StringRef::npos) + FirstNonDigit = Expr.size(); + } else { + FirstNonDigit = Expr.find_first_not_of("0123456789"); + if (FirstNonDigit == StringRef::npos) + FirstNonDigit = Expr.size(); + } + return std::make_pair(Expr.substr(0, FirstNonDigit), + Expr.substr(FirstNonDigit)); + } + + // Evaluate a constant numeric expression (hexidecimal or decimal) and + // return a pair containing the result, and the expression remaining to be + // evaluated. + std::pair<EvalResult, StringRef> evalNumberExpr(StringRef Expr) const { + StringRef ValueStr; + StringRef RemainingExpr; + std::tie(ValueStr, RemainingExpr) = parseNumberString(Expr); + + if (ValueStr.empty() || !isdigit(ValueStr[0])) + return std::make_pair( + unexpectedToken(RemainingExpr, RemainingExpr, "expected number"), ""); + uint64_t Value; + ValueStr.getAsInteger(0, Value); + return std::make_pair(EvalResult(Value), RemainingExpr); + } + + // Evaluate an expression of the form "(<expr>)" and return a pair + // containing the result of evaluating <expr>, plus the expression + // remaining to be parsed. + std::pair<EvalResult, StringRef> evalParensExpr(StringRef Expr, + ParseContext PCtx) const { + assert(Expr.startswith("(") && "Not a parenthesized expression"); + EvalResult SubExprResult; + StringRef RemainingExpr; + std::tie(SubExprResult, RemainingExpr) = + evalComplexExpr(evalSimpleExpr(Expr.substr(1).ltrim(), PCtx), PCtx); + if (SubExprResult.hasError()) + return std::make_pair(SubExprResult, ""); + if (!RemainingExpr.startswith(")")) + return std::make_pair( + unexpectedToken(RemainingExpr, Expr, "expected ')'"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + return std::make_pair(SubExprResult, RemainingExpr); + } + + // Evaluate an expression in one of the following forms: + // *{<number>}<expr> + // Return a pair containing the result, plus the expression remaining to be + // parsed. + std::pair<EvalResult, StringRef> evalLoadExpr(StringRef Expr) const { + assert(Expr.startswith("*") && "Not a load expression"); + StringRef RemainingExpr = Expr.substr(1).ltrim(); + + // Parse read size. + if (!RemainingExpr.startswith("{")) + return std::make_pair(EvalResult("Expected '{' following '*'."), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + EvalResult ReadSizeExpr; + std::tie(ReadSizeExpr, RemainingExpr) = evalNumberExpr(RemainingExpr); + if (ReadSizeExpr.hasError()) + return std::make_pair(ReadSizeExpr, RemainingExpr); + uint64_t ReadSize = ReadSizeExpr.getValue(); + if (ReadSize < 1 || ReadSize > 8) + return std::make_pair(EvalResult("Invalid size for dereference."), ""); + if (!RemainingExpr.startswith("}")) + return std::make_pair(EvalResult("Missing '}' for dereference."), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + // Evaluate the expression representing the load address. + ParseContext LoadCtx(true); + EvalResult LoadAddrExprResult; + std::tie(LoadAddrExprResult, RemainingExpr) = + evalComplexExpr(evalSimpleExpr(RemainingExpr, LoadCtx), LoadCtx); + + if (LoadAddrExprResult.hasError()) + return std::make_pair(LoadAddrExprResult, ""); + + uint64_t LoadAddr = LoadAddrExprResult.getValue(); + + return std::make_pair( + EvalResult(Checker.readMemoryAtAddr(LoadAddr, ReadSize)), + RemainingExpr); + } + + // Evaluate a "simple" expression. This is any expression that _isn't_ an + // un-parenthesized binary expression. + // + // "Simple" expressions can be optionally bit-sliced. See evalSlicedExpr. + // + // Returns a pair containing the result of the evaluation, plus the + // expression remaining to be parsed. + std::pair<EvalResult, StringRef> evalSimpleExpr(StringRef Expr, + ParseContext PCtx) const { + EvalResult SubExprResult; + StringRef RemainingExpr; + + if (Expr.empty()) + return std::make_pair(EvalResult("Unexpected end of expression"), ""); + + if (Expr[0] == '(') + std::tie(SubExprResult, RemainingExpr) = evalParensExpr(Expr, PCtx); + else if (Expr[0] == '*') + std::tie(SubExprResult, RemainingExpr) = evalLoadExpr(Expr); + else if (isalpha(Expr[0]) || Expr[0] == '_') + std::tie(SubExprResult, RemainingExpr) = evalIdentifierExpr(Expr, PCtx); + else if (isdigit(Expr[0])) + std::tie(SubExprResult, RemainingExpr) = evalNumberExpr(Expr); + else + return std::make_pair( + unexpectedToken(Expr, Expr, + "expected '(', '*', identifier, or number"), ""); + + if (SubExprResult.hasError()) + return std::make_pair(SubExprResult, RemainingExpr); + + // Evaluate bit-slice if present. + if (RemainingExpr.startswith("[")) + std::tie(SubExprResult, RemainingExpr) = + evalSliceExpr(std::make_pair(SubExprResult, RemainingExpr)); + + return std::make_pair(SubExprResult, RemainingExpr); + } + + // Evaluate a bit-slice of an expression. + // A bit-slice has the form "<expr>[high:low]". The result of evaluating a + // slice is the bits between high and low (inclusive) in the original + // expression, right shifted so that the "low" bit is in position 0 in the + // result. + // Returns a pair containing the result of the slice operation, plus the + // expression remaining to be parsed. + std::pair<EvalResult, StringRef> + evalSliceExpr(std::pair<EvalResult, StringRef> Ctx) const { + EvalResult SubExprResult; + StringRef RemainingExpr; + std::tie(SubExprResult, RemainingExpr) = Ctx; + + assert(RemainingExpr.startswith("[") && "Not a slice expr."); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + EvalResult HighBitExpr; + std::tie(HighBitExpr, RemainingExpr) = evalNumberExpr(RemainingExpr); + + if (HighBitExpr.hasError()) + return std::make_pair(HighBitExpr, RemainingExpr); + + if (!RemainingExpr.startswith(":")) + return std::make_pair( + unexpectedToken(RemainingExpr, RemainingExpr, "expected ':'"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + EvalResult LowBitExpr; + std::tie(LowBitExpr, RemainingExpr) = evalNumberExpr(RemainingExpr); + + if (LowBitExpr.hasError()) + return std::make_pair(LowBitExpr, RemainingExpr); + + if (!RemainingExpr.startswith("]")) + return std::make_pair( + unexpectedToken(RemainingExpr, RemainingExpr, "expected ']'"), ""); + RemainingExpr = RemainingExpr.substr(1).ltrim(); + + unsigned HighBit = HighBitExpr.getValue(); + unsigned LowBit = LowBitExpr.getValue(); + uint64_t Mask = ((uint64_t)1 << (HighBit - LowBit + 1)) - 1; + uint64_t SlicedValue = (SubExprResult.getValue() >> LowBit) & Mask; + return std::make_pair(EvalResult(SlicedValue), RemainingExpr); + } + + // Evaluate a "complex" expression. + // Takes an already evaluated subexpression and checks for the presence of a + // binary operator, computing the result of the binary operation if one is + // found. Used to make arithmetic expressions left-associative. + // Returns a pair containing the ultimate result of evaluating the + // expression, plus the expression remaining to be evaluated. + std::pair<EvalResult, StringRef> + evalComplexExpr(std::pair<EvalResult, StringRef> LHSAndRemaining, + ParseContext PCtx) const { + EvalResult LHSResult; + StringRef RemainingExpr; + std::tie(LHSResult, RemainingExpr) = LHSAndRemaining; + + // If there was an error, or there's nothing left to evaluate, return the + // result. + if (LHSResult.hasError() || RemainingExpr == "") + return std::make_pair(LHSResult, RemainingExpr); + + // Otherwise check if this is a binary expressioan. + BinOpToken BinOp; + std::tie(BinOp, RemainingExpr) = parseBinOpToken(RemainingExpr); + + // If this isn't a recognized expression just return. + if (BinOp == BinOpToken::Invalid) + return std::make_pair(LHSResult, RemainingExpr); + + // This is a recognized bin-op. Evaluate the RHS, then evaluate the binop. + EvalResult RHSResult; + std::tie(RHSResult, RemainingExpr) = evalSimpleExpr(RemainingExpr, PCtx); + + // If there was an error evaluating the RHS, return it. + if (RHSResult.hasError()) + return std::make_pair(RHSResult, RemainingExpr); + + // This is a binary expression - evaluate and try to continue as a + // complex expr. + EvalResult ThisResult(computeBinOpResult(BinOp, LHSResult, RHSResult)); + + return evalComplexExpr(std::make_pair(ThisResult, RemainingExpr), PCtx); + } + + bool decodeInst(StringRef Symbol, MCInst &Inst, uint64_t &Size) const { + MCDisassembler *Dis = Checker.Disassembler; + StringRef SectionMem = Checker.getSubsectionStartingAt(Symbol); + ArrayRef<uint8_t> SectionBytes( + reinterpret_cast<const uint8_t *>(SectionMem.data()), + SectionMem.size()); + + MCDisassembler::DecodeStatus S = + Dis->getInstruction(Inst, Size, SectionBytes, 0, nulls(), nulls()); + + return (S == MCDisassembler::Success); + } +}; +} + +RuntimeDyldCheckerImpl::RuntimeDyldCheckerImpl(RuntimeDyld &RTDyld, + MCDisassembler *Disassembler, + MCInstPrinter *InstPrinter, + raw_ostream &ErrStream) + : RTDyld(RTDyld), Disassembler(Disassembler), InstPrinter(InstPrinter), + ErrStream(ErrStream) { + RTDyld.Checker = this; +} + +bool RuntimeDyldCheckerImpl::check(StringRef CheckExpr) const { + CheckExpr = CheckExpr.trim(); + DEBUG(dbgs() << "RuntimeDyldChecker: Checking '" << CheckExpr << "'...\n"); + RuntimeDyldCheckerExprEval P(*this, ErrStream); + bool Result = P.evaluate(CheckExpr); + (void)Result; + DEBUG(dbgs() << "RuntimeDyldChecker: '" << CheckExpr << "' " + << (Result ? "passed" : "FAILED") << ".\n"); + return Result; +} + +bool RuntimeDyldCheckerImpl::checkAllRulesInBuffer(StringRef RulePrefix, + MemoryBuffer *MemBuf) const { + bool DidAllTestsPass = true; + unsigned NumRules = 0; + + const char *LineStart = MemBuf->getBufferStart(); + + // Eat whitespace. + while (LineStart != MemBuf->getBufferEnd() && std::isspace(*LineStart)) + ++LineStart; + + while (LineStart != MemBuf->getBufferEnd() && *LineStart != '\0') { + const char *LineEnd = LineStart; + while (LineEnd != MemBuf->getBufferEnd() && *LineEnd != '\r' && + *LineEnd != '\n') + ++LineEnd; + + StringRef Line(LineStart, LineEnd - LineStart); + if (Line.startswith(RulePrefix)) { + DidAllTestsPass &= check(Line.substr(RulePrefix.size())); + ++NumRules; + } + + // Eat whitespace. + LineStart = LineEnd; + while (LineStart != MemBuf->getBufferEnd() && std::isspace(*LineStart)) + ++LineStart; + } + return DidAllTestsPass && (NumRules != 0); +} + +bool RuntimeDyldCheckerImpl::isSymbolValid(StringRef Symbol) const { + if (getRTDyld().getSymbol(Symbol)) + return true; + return !!getRTDyld().Resolver.findSymbol(Symbol); +} + +uint64_t RuntimeDyldCheckerImpl::getSymbolLocalAddr(StringRef Symbol) const { + return static_cast<uint64_t>( + reinterpret_cast<uintptr_t>(getRTDyld().getSymbolLocalAddress(Symbol))); +} + +uint64_t RuntimeDyldCheckerImpl::getSymbolRemoteAddr(StringRef Symbol) const { + if (auto InternalSymbol = getRTDyld().getSymbol(Symbol)) + return InternalSymbol.getAddress(); + return getRTDyld().Resolver.findSymbol(Symbol).getAddress(); +} + +uint64_t RuntimeDyldCheckerImpl::readMemoryAtAddr(uint64_t SrcAddr, + unsigned Size) const { + uintptr_t PtrSizedAddr = static_cast<uintptr_t>(SrcAddr); + assert(PtrSizedAddr == SrcAddr && "Linker memory pointer out-of-range."); + uint8_t *Src = reinterpret_cast<uint8_t*>(PtrSizedAddr); + return getRTDyld().readBytesUnaligned(Src, Size); +} + + +std::pair<const RuntimeDyldCheckerImpl::SectionAddressInfo*, std::string> +RuntimeDyldCheckerImpl::findSectionAddrInfo(StringRef FileName, + StringRef SectionName) const { + + auto SectionMapItr = Stubs.find(FileName); + if (SectionMapItr == Stubs.end()) { + std::string ErrorMsg = "File '"; + ErrorMsg += FileName; + ErrorMsg += "' not found. "; + if (Stubs.empty()) + ErrorMsg += "No stubs registered."; + else { + ErrorMsg += "Available files are:"; + for (const auto& StubEntry : Stubs) { + ErrorMsg += " '"; + ErrorMsg += StubEntry.first; + ErrorMsg += "'"; + } + } + ErrorMsg += "\n"; + return std::make_pair(nullptr, ErrorMsg); + } + + auto SectionInfoItr = SectionMapItr->second.find(SectionName); + if (SectionInfoItr == SectionMapItr->second.end()) + return std::make_pair(nullptr, + ("Section '" + SectionName + "' not found in file '" + + FileName + "'\n").str()); + + return std::make_pair(&SectionInfoItr->second, std::string("")); +} + +std::pair<uint64_t, std::string> RuntimeDyldCheckerImpl::getSectionAddr( + StringRef FileName, StringRef SectionName, bool IsInsideLoad) const { + + const SectionAddressInfo *SectionInfo = nullptr; + { + std::string ErrorMsg; + std::tie(SectionInfo, ErrorMsg) = + findSectionAddrInfo(FileName, SectionName); + if (ErrorMsg != "") + return std::make_pair(0, ErrorMsg); + } + + unsigned SectionID = SectionInfo->SectionID; + uint64_t Addr; + if (IsInsideLoad) + Addr = static_cast<uint64_t>(reinterpret_cast<uintptr_t>( + getRTDyld().Sections[SectionID].getAddress())); + else + Addr = getRTDyld().Sections[SectionID].getLoadAddress(); + + return std::make_pair(Addr, std::string("")); +} + +std::pair<uint64_t, std::string> RuntimeDyldCheckerImpl::getStubAddrFor( + StringRef FileName, StringRef SectionName, StringRef SymbolName, + bool IsInsideLoad) const { + + const SectionAddressInfo *SectionInfo = nullptr; + { + std::string ErrorMsg; + std::tie(SectionInfo, ErrorMsg) = + findSectionAddrInfo(FileName, SectionName); + if (ErrorMsg != "") + return std::make_pair(0, ErrorMsg); + } + + unsigned SectionID = SectionInfo->SectionID; + const StubOffsetsMap &SymbolStubs = SectionInfo->StubOffsets; + auto StubOffsetItr = SymbolStubs.find(SymbolName); + if (StubOffsetItr == SymbolStubs.end()) + return std::make_pair(0, + ("Stub for symbol '" + SymbolName + "' not found. " + "If '" + SymbolName + "' is an internal symbol this " + "may indicate that the stub target offset is being " + "computed incorrectly.\n").str()); + + uint64_t StubOffset = StubOffsetItr->second; + + uint64_t Addr; + if (IsInsideLoad) { + uintptr_t SectionBase = reinterpret_cast<uintptr_t>( + getRTDyld().Sections[SectionID].getAddress()); + Addr = static_cast<uint64_t>(SectionBase) + StubOffset; + } else { + uint64_t SectionBase = getRTDyld().Sections[SectionID].getLoadAddress(); + Addr = SectionBase + StubOffset; + } + + return std::make_pair(Addr, std::string("")); +} + +StringRef +RuntimeDyldCheckerImpl::getSubsectionStartingAt(StringRef Name) const { + RTDyldSymbolTable::const_iterator pos = + getRTDyld().GlobalSymbolTable.find(Name); + if (pos == getRTDyld().GlobalSymbolTable.end()) + return StringRef(); + const auto &SymInfo = pos->second; + uint8_t *SectionAddr = getRTDyld().getSectionAddress(SymInfo.getSectionID()); + return StringRef(reinterpret_cast<const char *>(SectionAddr) + + SymInfo.getOffset(), + getRTDyld().Sections[SymInfo.getSectionID()].getSize() - + SymInfo.getOffset()); +} + +void RuntimeDyldCheckerImpl::registerSection( + StringRef FilePath, unsigned SectionID) { + StringRef FileName = sys::path::filename(FilePath); + const SectionEntry &Section = getRTDyld().Sections[SectionID]; + StringRef SectionName = Section.getName(); + + Stubs[FileName][SectionName].SectionID = SectionID; +} + +void RuntimeDyldCheckerImpl::registerStubMap( + StringRef FilePath, unsigned SectionID, + const RuntimeDyldImpl::StubMap &RTDyldStubs) { + StringRef FileName = sys::path::filename(FilePath); + const SectionEntry &Section = getRTDyld().Sections[SectionID]; + StringRef SectionName = Section.getName(); + + Stubs[FileName][SectionName].SectionID = SectionID; + + for (auto &StubMapEntry : RTDyldStubs) { + std::string SymbolName = ""; + + if (StubMapEntry.first.SymbolName) + SymbolName = StubMapEntry.first.SymbolName; + else { + // If this is a (Section, Offset) pair, do a reverse lookup in the + // global symbol table to find the name. + for (auto &GSTEntry : getRTDyld().GlobalSymbolTable) { + const auto &SymInfo = GSTEntry.second; + if (SymInfo.getSectionID() == StubMapEntry.first.SectionID && + SymInfo.getOffset() == + static_cast<uint64_t>(StubMapEntry.first.Offset)) { + SymbolName = GSTEntry.first(); + break; + } + } + } + + if (SymbolName != "") + Stubs[FileName][SectionName].StubOffsets[SymbolName] = + StubMapEntry.second; + } +} + +RuntimeDyldChecker::RuntimeDyldChecker(RuntimeDyld &RTDyld, + MCDisassembler *Disassembler, + MCInstPrinter *InstPrinter, + raw_ostream &ErrStream) + : Impl(make_unique<RuntimeDyldCheckerImpl>(RTDyld, Disassembler, + InstPrinter, ErrStream)) {} + +RuntimeDyldChecker::~RuntimeDyldChecker() {} + +RuntimeDyld& RuntimeDyldChecker::getRTDyld() { + return Impl->RTDyld; +} + +const RuntimeDyld& RuntimeDyldChecker::getRTDyld() const { + return Impl->RTDyld; +} + +bool RuntimeDyldChecker::check(StringRef CheckExpr) const { + return Impl->check(CheckExpr); +} + +bool RuntimeDyldChecker::checkAllRulesInBuffer(StringRef RulePrefix, + MemoryBuffer *MemBuf) const { + return Impl->checkAllRulesInBuffer(RulePrefix, MemBuf); +} + +std::pair<uint64_t, std::string> +RuntimeDyldChecker::getSectionAddr(StringRef FileName, StringRef SectionName, + bool LocalAddress) { + return Impl->getSectionAddr(FileName, SectionName, LocalAddress); +} diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCheckerImpl.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCheckerImpl.h new file mode 100644 index 0000000..69d2a7d --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCheckerImpl.h @@ -0,0 +1,77 @@ +//===-- RuntimeDyldCheckerImpl.h -- RuntimeDyld test framework --*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDCHECKERIMPL_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDCHECKERIMPL_H + +#include "RuntimeDyldImpl.h" +#include <set> + +namespace llvm { + +class RuntimeDyldCheckerImpl { + friend class RuntimeDyldChecker; + friend class RuntimeDyldImpl; + friend class RuntimeDyldCheckerExprEval; + friend class RuntimeDyldELF; + +public: + RuntimeDyldCheckerImpl(RuntimeDyld &RTDyld, MCDisassembler *Disassembler, + MCInstPrinter *InstPrinter, + llvm::raw_ostream &ErrStream); + + bool check(StringRef CheckExpr) const; + bool checkAllRulesInBuffer(StringRef RulePrefix, MemoryBuffer *MemBuf) const; + +private: + + // StubMap typedefs. + typedef std::map<std::string, uint64_t> StubOffsetsMap; + struct SectionAddressInfo { + uint64_t SectionID; + StubOffsetsMap StubOffsets; + }; + typedef std::map<std::string, SectionAddressInfo> SectionMap; + typedef std::map<std::string, SectionMap> StubMap; + + RuntimeDyldImpl &getRTDyld() const { return *RTDyld.Dyld; } + + bool isSymbolValid(StringRef Symbol) const; + uint64_t getSymbolLocalAddr(StringRef Symbol) const; + uint64_t getSymbolRemoteAddr(StringRef Symbol) const; + uint64_t readMemoryAtAddr(uint64_t Addr, unsigned Size) const; + + std::pair<const SectionAddressInfo*, std::string> findSectionAddrInfo( + StringRef FileName, + StringRef SectionName) const; + + std::pair<uint64_t, std::string> getSectionAddr(StringRef FileName, + StringRef SectionName, + bool IsInsideLoad) const; + + std::pair<uint64_t, std::string> getStubAddrFor(StringRef FileName, + StringRef SectionName, + StringRef Symbol, + bool IsInsideLoad) const; + StringRef getSubsectionStartingAt(StringRef Name) const; + + void registerSection(StringRef FilePath, unsigned SectionID); + void registerStubMap(StringRef FilePath, unsigned SectionID, + const RuntimeDyldImpl::StubMap &RTDyldStubs); + + RuntimeDyld &RTDyld; + MCDisassembler *Disassembler; + MCInstPrinter *InstPrinter; + llvm::raw_ostream &ErrStream; + + StubMap Stubs; +}; +} + +#endif diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp new file mode 100644 index 0000000..e09b71a --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp @@ -0,0 +1,1873 @@ +//===-- RuntimeDyldELF.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// Implementation of ELF support for the MC-JIT runtime dynamic linker. +// +//===----------------------------------------------------------------------===// + +#include "RuntimeDyldELF.h" +#include "RuntimeDyldCheckerImpl.h" +#include "llvm/ADT/IntervalMap.h" +#include "llvm/ADT/STLExtras.h" +#include "llvm/ADT/StringRef.h" +#include "llvm/ADT/Triple.h" +#include "llvm/MC/MCStreamer.h" +#include "llvm/Object/ELFObjectFile.h" +#include "llvm/Object/ObjectFile.h" +#include "llvm/Support/ELF.h" +#include "llvm/Support/Endian.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/TargetRegistry.h" + +using namespace llvm; +using namespace llvm::object; + +#define DEBUG_TYPE "dyld" + +static inline std::error_code check(std::error_code Err) { + if (Err) { + report_fatal_error(Err.message()); + } + return Err; +} + +namespace { + +template <class ELFT> class DyldELFObject : public ELFObjectFile<ELFT> { + LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) + + typedef Elf_Shdr_Impl<ELFT> Elf_Shdr; + typedef Elf_Sym_Impl<ELFT> Elf_Sym; + typedef Elf_Rel_Impl<ELFT, false> Elf_Rel; + typedef Elf_Rel_Impl<ELFT, true> Elf_Rela; + + typedef Elf_Ehdr_Impl<ELFT> Elf_Ehdr; + + typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type; + +public: + DyldELFObject(MemoryBufferRef Wrapper, std::error_code &ec); + + void updateSectionAddress(const SectionRef &Sec, uint64_t Addr); + + void updateSymbolAddress(const SymbolRef &SymRef, uint64_t Addr); + + // Methods for type inquiry through isa, cast and dyn_cast + static inline bool classof(const Binary *v) { + return (isa<ELFObjectFile<ELFT>>(v) && + classof(cast<ELFObjectFile<ELFT>>(v))); + } + static inline bool classof(const ELFObjectFile<ELFT> *v) { + return v->isDyldType(); + } +}; + + + +// The MemoryBuffer passed into this constructor is just a wrapper around the +// actual memory. Ultimately, the Binary parent class will take ownership of +// this MemoryBuffer object but not the underlying memory. +template <class ELFT> +DyldELFObject<ELFT>::DyldELFObject(MemoryBufferRef Wrapper, std::error_code &EC) + : ELFObjectFile<ELFT>(Wrapper, EC) { + this->isDyldELFObject = true; +} + +template <class ELFT> +void DyldELFObject<ELFT>::updateSectionAddress(const SectionRef &Sec, + uint64_t Addr) { + DataRefImpl ShdrRef = Sec.getRawDataRefImpl(); + Elf_Shdr *shdr = + const_cast<Elf_Shdr *>(reinterpret_cast<const Elf_Shdr *>(ShdrRef.p)); + + // This assumes the address passed in matches the target address bitness + // The template-based type cast handles everything else. + shdr->sh_addr = static_cast<addr_type>(Addr); +} + +template <class ELFT> +void DyldELFObject<ELFT>::updateSymbolAddress(const SymbolRef &SymRef, + uint64_t Addr) { + + Elf_Sym *sym = const_cast<Elf_Sym *>( + ELFObjectFile<ELFT>::getSymbol(SymRef.getRawDataRefImpl())); + + // This assumes the address passed in matches the target address bitness + // The template-based type cast handles everything else. + sym->st_value = static_cast<addr_type>(Addr); +} + +class LoadedELFObjectInfo final + : public RuntimeDyld::LoadedObjectInfoHelper<LoadedELFObjectInfo> { +public: + LoadedELFObjectInfo(RuntimeDyldImpl &RTDyld, ObjSectionToIDMap ObjSecToIDMap) + : LoadedObjectInfoHelper(RTDyld, std::move(ObjSecToIDMap)) {} + + OwningBinary<ObjectFile> + getObjectForDebug(const ObjectFile &Obj) const override; +}; + +template <typename ELFT> +std::unique_ptr<DyldELFObject<ELFT>> +createRTDyldELFObject(MemoryBufferRef Buffer, + const ObjectFile &SourceObject, + const LoadedELFObjectInfo &L, + std::error_code &ec) { + typedef typename ELFFile<ELFT>::Elf_Shdr Elf_Shdr; + typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type; + + std::unique_ptr<DyldELFObject<ELFT>> Obj = + llvm::make_unique<DyldELFObject<ELFT>>(Buffer, ec); + + // Iterate over all sections in the object. + auto SI = SourceObject.section_begin(); + for (const auto &Sec : Obj->sections()) { + StringRef SectionName; + Sec.getName(SectionName); + if (SectionName != "") { + DataRefImpl ShdrRef = Sec.getRawDataRefImpl(); + Elf_Shdr *shdr = const_cast<Elf_Shdr *>( + reinterpret_cast<const Elf_Shdr *>(ShdrRef.p)); + + if (uint64_t SecLoadAddr = L.getSectionLoadAddress(*SI)) { + // This assumes that the address passed in matches the target address + // bitness. The template-based type cast handles everything else. + shdr->sh_addr = static_cast<addr_type>(SecLoadAddr); + } + } + ++SI; + } + + return Obj; +} + +OwningBinary<ObjectFile> createELFDebugObject(const ObjectFile &Obj, + const LoadedELFObjectInfo &L) { + assert(Obj.isELF() && "Not an ELF object file."); + + std::unique_ptr<MemoryBuffer> Buffer = + MemoryBuffer::getMemBufferCopy(Obj.getData(), Obj.getFileName()); + + std::error_code ec; + + std::unique_ptr<ObjectFile> DebugObj; + if (Obj.getBytesInAddress() == 4 && Obj.isLittleEndian()) { + typedef ELFType<support::little, false> ELF32LE; + DebugObj = createRTDyldELFObject<ELF32LE>(Buffer->getMemBufferRef(), Obj, L, + ec); + } else if (Obj.getBytesInAddress() == 4 && !Obj.isLittleEndian()) { + typedef ELFType<support::big, false> ELF32BE; + DebugObj = createRTDyldELFObject<ELF32BE>(Buffer->getMemBufferRef(), Obj, L, + ec); + } else if (Obj.getBytesInAddress() == 8 && !Obj.isLittleEndian()) { + typedef ELFType<support::big, true> ELF64BE; + DebugObj = createRTDyldELFObject<ELF64BE>(Buffer->getMemBufferRef(), Obj, L, + ec); + } else if (Obj.getBytesInAddress() == 8 && Obj.isLittleEndian()) { + typedef ELFType<support::little, true> ELF64LE; + DebugObj = createRTDyldELFObject<ELF64LE>(Buffer->getMemBufferRef(), Obj, L, + ec); + } else + llvm_unreachable("Unexpected ELF format"); + + assert(!ec && "Could not construct copy ELF object file"); + + return OwningBinary<ObjectFile>(std::move(DebugObj), std::move(Buffer)); +} + +OwningBinary<ObjectFile> +LoadedELFObjectInfo::getObjectForDebug(const ObjectFile &Obj) const { + return createELFDebugObject(Obj, *this); +} + +} // anonymous namespace + +namespace llvm { + +RuntimeDyldELF::RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldImpl(MemMgr, Resolver), GOTSectionID(0), CurrentGOTIndex(0) {} +RuntimeDyldELF::~RuntimeDyldELF() {} + +void RuntimeDyldELF::registerEHFrames() { + for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) { + SID EHFrameSID = UnregisteredEHFrameSections[i]; + uint8_t *EHFrameAddr = Sections[EHFrameSID].getAddress(); + uint64_t EHFrameLoadAddr = Sections[EHFrameSID].getLoadAddress(); + size_t EHFrameSize = Sections[EHFrameSID].getSize(); + MemMgr.registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize); + RegisteredEHFrameSections.push_back(EHFrameSID); + } + UnregisteredEHFrameSections.clear(); +} + +void RuntimeDyldELF::deregisterEHFrames() { + for (int i = 0, e = RegisteredEHFrameSections.size(); i != e; ++i) { + SID EHFrameSID = RegisteredEHFrameSections[i]; + uint8_t *EHFrameAddr = Sections[EHFrameSID].getAddress(); + uint64_t EHFrameLoadAddr = Sections[EHFrameSID].getLoadAddress(); + size_t EHFrameSize = Sections[EHFrameSID].getSize(); + MemMgr.deregisterEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize); + } + RegisteredEHFrameSections.clear(); +} + +std::unique_ptr<RuntimeDyld::LoadedObjectInfo> +RuntimeDyldELF::loadObject(const object::ObjectFile &O) { + return llvm::make_unique<LoadedELFObjectInfo>(*this, loadObjectImpl(O)); +} + +void RuntimeDyldELF::resolveX86_64Relocation(const SectionEntry &Section, + uint64_t Offset, uint64_t Value, + uint32_t Type, int64_t Addend, + uint64_t SymOffset) { + switch (Type) { + default: + llvm_unreachable("Relocation type not implemented yet!"); + break; + case ELF::R_X86_64_64: { + support::ulittle64_t::ref(Section.getAddressWithOffset(Offset)) = + Value + Addend; + DEBUG(dbgs() << "Writing " << format("%p", (Value + Addend)) << " at " + << format("%p\n", Section.getAddressWithOffset(Offset))); + break; + } + case ELF::R_X86_64_32: + case ELF::R_X86_64_32S: { + Value += Addend; + assert((Type == ELF::R_X86_64_32 && (Value <= UINT32_MAX)) || + (Type == ELF::R_X86_64_32S && + ((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN))); + uint32_t TruncatedAddr = (Value & 0xFFFFFFFF); + support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) = + TruncatedAddr; + DEBUG(dbgs() << "Writing " << format("%p", TruncatedAddr) << " at " + << format("%p\n", Section.getAddressWithOffset(Offset))); + break; + } + case ELF::R_X86_64_PC8: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + int64_t RealOffset = Value + Addend - FinalAddress; + assert(isInt<8>(RealOffset)); + int8_t TruncOffset = (RealOffset & 0xFF); + Section.getAddress()[Offset] = TruncOffset; + break; + } + case ELF::R_X86_64_PC32: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + int64_t RealOffset = Value + Addend - FinalAddress; + assert(isInt<32>(RealOffset)); + int32_t TruncOffset = (RealOffset & 0xFFFFFFFF); + support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) = + TruncOffset; + break; + } + case ELF::R_X86_64_PC64: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + int64_t RealOffset = Value + Addend - FinalAddress; + support::ulittle64_t::ref(Section.getAddressWithOffset(Offset)) = + RealOffset; + break; + } + } +} + +void RuntimeDyldELF::resolveX86Relocation(const SectionEntry &Section, + uint64_t Offset, uint32_t Value, + uint32_t Type, int32_t Addend) { + switch (Type) { + case ELF::R_386_32: { + support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) = + Value + Addend; + break; + } + case ELF::R_386_PC32: { + uint32_t FinalAddress = + Section.getLoadAddressWithOffset(Offset) & 0xFFFFFFFF; + uint32_t RealOffset = Value + Addend - FinalAddress; + support::ulittle32_t::ref(Section.getAddressWithOffset(Offset)) = + RealOffset; + break; + } + default: + // There are other relocation types, but it appears these are the + // only ones currently used by the LLVM ELF object writer + llvm_unreachable("Relocation type not implemented yet!"); + break; + } +} + +void RuntimeDyldELF::resolveAArch64Relocation(const SectionEntry &Section, + uint64_t Offset, uint64_t Value, + uint32_t Type, int64_t Addend) { + uint32_t *TargetPtr = + reinterpret_cast<uint32_t *>(Section.getAddressWithOffset(Offset)); + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + + DEBUG(dbgs() << "resolveAArch64Relocation, LocalAddress: 0x" + << format("%llx", Section.getAddressWithOffset(Offset)) + << " FinalAddress: 0x" << format("%llx", FinalAddress) + << " Value: 0x" << format("%llx", Value) << " Type: 0x" + << format("%x", Type) << " Addend: 0x" << format("%llx", Addend) + << "\n"); + + switch (Type) { + default: + llvm_unreachable("Relocation type not implemented yet!"); + break; + case ELF::R_AARCH64_ABS64: { + uint64_t *TargetPtr = + reinterpret_cast<uint64_t *>(Section.getAddressWithOffset(Offset)); + *TargetPtr = Value + Addend; + break; + } + case ELF::R_AARCH64_PREL32: { + uint64_t Result = Value + Addend - FinalAddress; + assert(static_cast<int64_t>(Result) >= INT32_MIN && + static_cast<int64_t>(Result) <= UINT32_MAX); + *TargetPtr = static_cast<uint32_t>(Result & 0xffffffffU); + break; + } + case ELF::R_AARCH64_CALL26: // fallthrough + case ELF::R_AARCH64_JUMP26: { + // Operation: S+A-P. Set Call or B immediate value to bits fff_fffc of the + // calculation. + uint64_t BranchImm = Value + Addend - FinalAddress; + + // "Check that -2^27 <= result < 2^27". + assert(isInt<28>(BranchImm)); + + // AArch64 code is emitted with .rela relocations. The data already in any + // bits affected by the relocation on entry is garbage. + *TargetPtr &= 0xfc000000U; + // Immediate goes in bits 25:0 of B and BL. + *TargetPtr |= static_cast<uint32_t>(BranchImm & 0xffffffcU) >> 2; + break; + } + case ELF::R_AARCH64_MOVW_UABS_G3: { + uint64_t Result = Value + Addend; + + // AArch64 code is emitted with .rela relocations. The data already in any + // bits affected by the relocation on entry is garbage. + *TargetPtr &= 0xffe0001fU; + // Immediate goes in bits 20:5 of MOVZ/MOVK instruction + *TargetPtr |= Result >> (48 - 5); + // Shift must be "lsl #48", in bits 22:21 + assert((*TargetPtr >> 21 & 0x3) == 3 && "invalid shift for relocation"); + break; + } + case ELF::R_AARCH64_MOVW_UABS_G2_NC: { + uint64_t Result = Value + Addend; + + // AArch64 code is emitted with .rela relocations. The data already in any + // bits affected by the relocation on entry is garbage. + *TargetPtr &= 0xffe0001fU; + // Immediate goes in bits 20:5 of MOVZ/MOVK instruction + *TargetPtr |= ((Result & 0xffff00000000ULL) >> (32 - 5)); + // Shift must be "lsl #32", in bits 22:21 + assert((*TargetPtr >> 21 & 0x3) == 2 && "invalid shift for relocation"); + break; + } + case ELF::R_AARCH64_MOVW_UABS_G1_NC: { + uint64_t Result = Value + Addend; + + // AArch64 code is emitted with .rela relocations. The data already in any + // bits affected by the relocation on entry is garbage. + *TargetPtr &= 0xffe0001fU; + // Immediate goes in bits 20:5 of MOVZ/MOVK instruction + *TargetPtr |= ((Result & 0xffff0000U) >> (16 - 5)); + // Shift must be "lsl #16", in bits 22:2 + assert((*TargetPtr >> 21 & 0x3) == 1 && "invalid shift for relocation"); + break; + } + case ELF::R_AARCH64_MOVW_UABS_G0_NC: { + uint64_t Result = Value + Addend; + + // AArch64 code is emitted with .rela relocations. The data already in any + // bits affected by the relocation on entry is garbage. + *TargetPtr &= 0xffe0001fU; + // Immediate goes in bits 20:5 of MOVZ/MOVK instruction + *TargetPtr |= ((Result & 0xffffU) << 5); + // Shift must be "lsl #0", in bits 22:21. + assert((*TargetPtr >> 21 & 0x3) == 0 && "invalid shift for relocation"); + break; + } + case ELF::R_AARCH64_ADR_PREL_PG_HI21: { + // Operation: Page(S+A) - Page(P) + uint64_t Result = + ((Value + Addend) & ~0xfffULL) - (FinalAddress & ~0xfffULL); + + // Check that -2^32 <= X < 2^32 + assert(isInt<33>(Result) && "overflow check failed for relocation"); + + // AArch64 code is emitted with .rela relocations. The data already in any + // bits affected by the relocation on entry is garbage. + *TargetPtr &= 0x9f00001fU; + // Immediate goes in bits 30:29 + 5:23 of ADRP instruction, taken + // from bits 32:12 of X. + *TargetPtr |= ((Result & 0x3000U) << (29 - 12)); + *TargetPtr |= ((Result & 0x1ffffc000ULL) >> (14 - 5)); + break; + } + case ELF::R_AARCH64_LDST32_ABS_LO12_NC: { + // Operation: S + A + uint64_t Result = Value + Addend; + + // AArch64 code is emitted with .rela relocations. The data already in any + // bits affected by the relocation on entry is garbage. + *TargetPtr &= 0xffc003ffU; + // Immediate goes in bits 21:10 of LD/ST instruction, taken + // from bits 11:2 of X + *TargetPtr |= ((Result & 0xffc) << (10 - 2)); + break; + } + case ELF::R_AARCH64_LDST64_ABS_LO12_NC: { + // Operation: S + A + uint64_t Result = Value + Addend; + + // AArch64 code is emitted with .rela relocations. The data already in any + // bits affected by the relocation on entry is garbage. + *TargetPtr &= 0xffc003ffU; + // Immediate goes in bits 21:10 of LD/ST instruction, taken + // from bits 11:3 of X + *TargetPtr |= ((Result & 0xff8) << (10 - 3)); + break; + } + } +} + +void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section, + uint64_t Offset, uint32_t Value, + uint32_t Type, int32_t Addend) { + // TODO: Add Thumb relocations. + uint32_t *TargetPtr = + reinterpret_cast<uint32_t *>(Section.getAddressWithOffset(Offset)); + uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset) & 0xFFFFFFFF; + Value += Addend; + + DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: " + << Section.getAddressWithOffset(Offset) + << " FinalAddress: " << format("%p", FinalAddress) << " Value: " + << format("%x", Value) << " Type: " << format("%x", Type) + << " Addend: " << format("%x", Addend) << "\n"); + + switch (Type) { + default: + llvm_unreachable("Not implemented relocation type!"); + + case ELF::R_ARM_NONE: + break; + case ELF::R_ARM_PREL31: + case ELF::R_ARM_TARGET1: + case ELF::R_ARM_ABS32: + *TargetPtr = Value; + break; + // Write first 16 bit of 32 bit value to the mov instruction. + // Last 4 bit should be shifted. + case ELF::R_ARM_MOVW_ABS_NC: + case ELF::R_ARM_MOVT_ABS: + if (Type == ELF::R_ARM_MOVW_ABS_NC) + Value = Value & 0xFFFF; + else if (Type == ELF::R_ARM_MOVT_ABS) + Value = (Value >> 16) & 0xFFFF; + *TargetPtr &= ~0x000F0FFF; + *TargetPtr |= Value & 0xFFF; + *TargetPtr |= ((Value >> 12) & 0xF) << 16; + break; + // Write 24 bit relative value to the branch instruction. + case ELF::R_ARM_PC24: // Fall through. + case ELF::R_ARM_CALL: // Fall through. + case ELF::R_ARM_JUMP24: + int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8); + RelValue = (RelValue & 0x03FFFFFC) >> 2; + assert((*TargetPtr & 0xFFFFFF) == 0xFFFFFE); + *TargetPtr &= 0xFF000000; + *TargetPtr |= RelValue; + break; + } +} + +void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section, + uint64_t Offset, uint32_t Value, + uint32_t Type, int32_t Addend) { + uint8_t *TargetPtr = Section.getAddressWithOffset(Offset); + Value += Addend; + + DEBUG(dbgs() << "resolveMIPSRelocation, LocalAddress: " + << Section.getAddressWithOffset(Offset) << " FinalAddress: " + << format("%p", Section.getLoadAddressWithOffset(Offset)) + << " Value: " << format("%x", Value) + << " Type: " << format("%x", Type) + << " Addend: " << format("%x", Addend) << "\n"); + + uint32_t Insn = readBytesUnaligned(TargetPtr, 4); + + switch (Type) { + default: + llvm_unreachable("Not implemented relocation type!"); + break; + case ELF::R_MIPS_32: + writeBytesUnaligned(Value, TargetPtr, 4); + break; + case ELF::R_MIPS_26: + Insn &= 0xfc000000; + Insn |= (Value & 0x0fffffff) >> 2; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + case ELF::R_MIPS_HI16: + // Get the higher 16-bits. Also add 1 if bit 15 is 1. + Insn &= 0xffff0000; + Insn |= ((Value + 0x8000) >> 16) & 0xffff; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + case ELF::R_MIPS_LO16: + Insn &= 0xffff0000; + Insn |= Value & 0xffff; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + case ELF::R_MIPS_PC32: { + uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + writeBytesUnaligned(Value - FinalAddress, (uint8_t *)TargetPtr, 4); + break; + } + case ELF::R_MIPS_PC16: { + uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + Insn &= 0xffff0000; + Insn |= ((Value - FinalAddress) >> 2) & 0xffff; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + } + case ELF::R_MIPS_PC19_S2: { + uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + Insn &= 0xfff80000; + Insn |= ((Value - (FinalAddress & ~0x3)) >> 2) & 0x7ffff; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + } + case ELF::R_MIPS_PC21_S2: { + uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + Insn &= 0xffe00000; + Insn |= ((Value - FinalAddress) >> 2) & 0x1fffff; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + } + case ELF::R_MIPS_PC26_S2: { + uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + Insn &= 0xfc000000; + Insn |= ((Value - FinalAddress) >> 2) & 0x3ffffff; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + } + case ELF::R_MIPS_PCHI16: { + uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + Insn &= 0xffff0000; + Insn |= ((Value - FinalAddress + 0x8000) >> 16) & 0xffff; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + } + case ELF::R_MIPS_PCLO16: { + uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + Insn &= 0xffff0000; + Insn |= (Value - FinalAddress) & 0xffff; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + } + } +} + +void RuntimeDyldELF::setMipsABI(const ObjectFile &Obj) { + if (Arch == Triple::UnknownArch || + !StringRef(Triple::getArchTypePrefix(Arch)).equals("mips")) { + IsMipsO32ABI = false; + IsMipsN64ABI = false; + return; + } + unsigned AbiVariant; + Obj.getPlatformFlags(AbiVariant); + IsMipsO32ABI = AbiVariant & ELF::EF_MIPS_ABI_O32; + IsMipsN64ABI = Obj.getFileFormatName().equals("ELF64-mips"); + if (AbiVariant & ELF::EF_MIPS_ABI2) + llvm_unreachable("Mips N32 ABI is not supported yet"); +} + +void RuntimeDyldELF::resolveMIPS64Relocation(const SectionEntry &Section, + uint64_t Offset, uint64_t Value, + uint32_t Type, int64_t Addend, + uint64_t SymOffset, + SID SectionID) { + uint32_t r_type = Type & 0xff; + uint32_t r_type2 = (Type >> 8) & 0xff; + uint32_t r_type3 = (Type >> 16) & 0xff; + + // RelType is used to keep information for which relocation type we are + // applying relocation. + uint32_t RelType = r_type; + int64_t CalculatedValue = evaluateMIPS64Relocation(Section, Offset, Value, + RelType, Addend, + SymOffset, SectionID); + if (r_type2 != ELF::R_MIPS_NONE) { + RelType = r_type2; + CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType, + CalculatedValue, SymOffset, + SectionID); + } + if (r_type3 != ELF::R_MIPS_NONE) { + RelType = r_type3; + CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType, + CalculatedValue, SymOffset, + SectionID); + } + applyMIPS64Relocation(Section.getAddressWithOffset(Offset), CalculatedValue, + RelType); +} + +int64_t +RuntimeDyldELF::evaluateMIPS64Relocation(const SectionEntry &Section, + uint64_t Offset, uint64_t Value, + uint32_t Type, int64_t Addend, + uint64_t SymOffset, SID SectionID) { + + DEBUG(dbgs() << "evaluateMIPS64Relocation, LocalAddress: 0x" + << format("%llx", Section.getAddressWithOffset(Offset)) + << " FinalAddress: 0x" + << format("%llx", Section.getLoadAddressWithOffset(Offset)) + << " Value: 0x" << format("%llx", Value) << " Type: 0x" + << format("%x", Type) << " Addend: 0x" << format("%llx", Addend) + << " SymOffset: " << format("%x", SymOffset) << "\n"); + + switch (Type) { + default: + llvm_unreachable("Not implemented relocation type!"); + break; + case ELF::R_MIPS_JALR: + case ELF::R_MIPS_NONE: + break; + case ELF::R_MIPS_32: + case ELF::R_MIPS_64: + return Value + Addend; + case ELF::R_MIPS_26: + return ((Value + Addend) >> 2) & 0x3ffffff; + case ELF::R_MIPS_GPREL16: { + uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]); + return Value + Addend - (GOTAddr + 0x7ff0); + } + case ELF::R_MIPS_SUB: + return Value - Addend; + case ELF::R_MIPS_HI16: + // Get the higher 16-bits. Also add 1 if bit 15 is 1. + return ((Value + Addend + 0x8000) >> 16) & 0xffff; + case ELF::R_MIPS_LO16: + return (Value + Addend) & 0xffff; + case ELF::R_MIPS_CALL16: + case ELF::R_MIPS_GOT_DISP: + case ELF::R_MIPS_GOT_PAGE: { + uint8_t *LocalGOTAddr = + getSectionAddress(SectionToGOTMap[SectionID]) + SymOffset; + uint64_t GOTEntry = readBytesUnaligned(LocalGOTAddr, 8); + + Value += Addend; + if (Type == ELF::R_MIPS_GOT_PAGE) + Value = (Value + 0x8000) & ~0xffff; + + if (GOTEntry) + assert(GOTEntry == Value && + "GOT entry has two different addresses."); + else + writeBytesUnaligned(Value, LocalGOTAddr, 8); + + return (SymOffset - 0x7ff0) & 0xffff; + } + case ELF::R_MIPS_GOT_OFST: { + int64_t page = (Value + Addend + 0x8000) & ~0xffff; + return (Value + Addend - page) & 0xffff; + } + case ELF::R_MIPS_GPREL32: { + uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]); + return Value + Addend - (GOTAddr + 0x7ff0); + } + case ELF::R_MIPS_PC16: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + return ((Value + Addend - FinalAddress) >> 2) & 0xffff; + } + case ELF::R_MIPS_PC32: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + return Value + Addend - FinalAddress; + } + case ELF::R_MIPS_PC18_S3: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + return ((Value + Addend - (FinalAddress & ~0x7)) >> 3) & 0x3ffff; + } + case ELF::R_MIPS_PC19_S2: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + return ((Value + Addend - (FinalAddress & ~0x3)) >> 2) & 0x7ffff; + } + case ELF::R_MIPS_PC21_S2: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + return ((Value + Addend - FinalAddress) >> 2) & 0x1fffff; + } + case ELF::R_MIPS_PC26_S2: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + return ((Value + Addend - FinalAddress) >> 2) & 0x3ffffff; + } + case ELF::R_MIPS_PCHI16: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + return ((Value + Addend - FinalAddress + 0x8000) >> 16) & 0xffff; + } + case ELF::R_MIPS_PCLO16: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + return (Value + Addend - FinalAddress) & 0xffff; + } + } + return 0; +} + +void RuntimeDyldELF::applyMIPS64Relocation(uint8_t *TargetPtr, + int64_t CalculatedValue, + uint32_t Type) { + uint32_t Insn = readBytesUnaligned(TargetPtr, 4); + + switch (Type) { + default: + break; + case ELF::R_MIPS_32: + case ELF::R_MIPS_GPREL32: + case ELF::R_MIPS_PC32: + writeBytesUnaligned(CalculatedValue & 0xffffffff, TargetPtr, 4); + break; + case ELF::R_MIPS_64: + case ELF::R_MIPS_SUB: + writeBytesUnaligned(CalculatedValue, TargetPtr, 8); + break; + case ELF::R_MIPS_26: + case ELF::R_MIPS_PC26_S2: + Insn = (Insn & 0xfc000000) | CalculatedValue; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + case ELF::R_MIPS_GPREL16: + Insn = (Insn & 0xffff0000) | (CalculatedValue & 0xffff); + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + case ELF::R_MIPS_HI16: + case ELF::R_MIPS_LO16: + case ELF::R_MIPS_PCHI16: + case ELF::R_MIPS_PCLO16: + case ELF::R_MIPS_PC16: + case ELF::R_MIPS_CALL16: + case ELF::R_MIPS_GOT_DISP: + case ELF::R_MIPS_GOT_PAGE: + case ELF::R_MIPS_GOT_OFST: + Insn = (Insn & 0xffff0000) | CalculatedValue; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + case ELF::R_MIPS_PC18_S3: + Insn = (Insn & 0xfffc0000) | CalculatedValue; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + case ELF::R_MIPS_PC19_S2: + Insn = (Insn & 0xfff80000) | CalculatedValue; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + case ELF::R_MIPS_PC21_S2: + Insn = (Insn & 0xffe00000) | CalculatedValue; + writeBytesUnaligned(Insn, TargetPtr, 4); + break; + } +} + +// Return the .TOC. section and offset. +void RuntimeDyldELF::findPPC64TOCSection(const ELFObjectFileBase &Obj, + ObjSectionToIDMap &LocalSections, + RelocationValueRef &Rel) { + // Set a default SectionID in case we do not find a TOC section below. + // This may happen for references to TOC base base (sym@toc, .odp + // relocation) without a .toc directive. In this case just use the + // first section (which is usually the .odp) since the code won't + // reference the .toc base directly. + Rel.SymbolName = nullptr; + Rel.SectionID = 0; + + // The TOC consists of sections .got, .toc, .tocbss, .plt in that + // order. The TOC starts where the first of these sections starts. + for (auto &Section: Obj.sections()) { + StringRef SectionName; + check(Section.getName(SectionName)); + + if (SectionName == ".got" + || SectionName == ".toc" + || SectionName == ".tocbss" + || SectionName == ".plt") { + Rel.SectionID = findOrEmitSection(Obj, Section, false, LocalSections); + break; + } + } + + // Per the ppc64-elf-linux ABI, The TOC base is TOC value plus 0x8000 + // thus permitting a full 64 Kbytes segment. + Rel.Addend = 0x8000; +} + +// Returns the sections and offset associated with the ODP entry referenced +// by Symbol. +void RuntimeDyldELF::findOPDEntrySection(const ELFObjectFileBase &Obj, + ObjSectionToIDMap &LocalSections, + RelocationValueRef &Rel) { + // Get the ELF symbol value (st_value) to compare with Relocation offset in + // .opd entries + for (section_iterator si = Obj.section_begin(), se = Obj.section_end(); + si != se; ++si) { + section_iterator RelSecI = si->getRelocatedSection(); + if (RelSecI == Obj.section_end()) + continue; + + StringRef RelSectionName; + check(RelSecI->getName(RelSectionName)); + if (RelSectionName != ".opd") + continue; + + for (elf_relocation_iterator i = si->relocation_begin(), + e = si->relocation_end(); + i != e;) { + // The R_PPC64_ADDR64 relocation indicates the first field + // of a .opd entry + uint64_t TypeFunc = i->getType(); + if (TypeFunc != ELF::R_PPC64_ADDR64) { + ++i; + continue; + } + + uint64_t TargetSymbolOffset = i->getOffset(); + symbol_iterator TargetSymbol = i->getSymbol(); + ErrorOr<int64_t> AddendOrErr = i->getAddend(); + Check(AddendOrErr.getError()); + int64_t Addend = *AddendOrErr; + + ++i; + if (i == e) + break; + + // Just check if following relocation is a R_PPC64_TOC + uint64_t TypeTOC = i->getType(); + if (TypeTOC != ELF::R_PPC64_TOC) + continue; + + // Finally compares the Symbol value and the target symbol offset + // to check if this .opd entry refers to the symbol the relocation + // points to. + if (Rel.Addend != (int64_t)TargetSymbolOffset) + continue; + + ErrorOr<section_iterator> TSIOrErr = TargetSymbol->getSection(); + check(TSIOrErr.getError()); + section_iterator tsi = *TSIOrErr; + bool IsCode = tsi->isText(); + Rel.SectionID = findOrEmitSection(Obj, (*tsi), IsCode, LocalSections); + Rel.Addend = (intptr_t)Addend; + return; + } + } + llvm_unreachable("Attempting to get address of ODP entry!"); +} + +// Relocation masks following the #lo(value), #hi(value), #ha(value), +// #higher(value), #highera(value), #highest(value), and #highesta(value) +// macros defined in section 4.5.1. Relocation Types of the PPC-elf64abi +// document. + +static inline uint16_t applyPPClo(uint64_t value) { return value & 0xffff; } + +static inline uint16_t applyPPChi(uint64_t value) { + return (value >> 16) & 0xffff; +} + +static inline uint16_t applyPPCha (uint64_t value) { + return ((value + 0x8000) >> 16) & 0xffff; +} + +static inline uint16_t applyPPChigher(uint64_t value) { + return (value >> 32) & 0xffff; +} + +static inline uint16_t applyPPChighera (uint64_t value) { + return ((value + 0x8000) >> 32) & 0xffff; +} + +static inline uint16_t applyPPChighest(uint64_t value) { + return (value >> 48) & 0xffff; +} + +static inline uint16_t applyPPChighesta (uint64_t value) { + return ((value + 0x8000) >> 48) & 0xffff; +} + +void RuntimeDyldELF::resolvePPC32Relocation(const SectionEntry &Section, + uint64_t Offset, uint64_t Value, + uint32_t Type, int64_t Addend) { + uint8_t *LocalAddress = Section.getAddressWithOffset(Offset); + switch (Type) { + default: + llvm_unreachable("Relocation type not implemented yet!"); + break; + case ELF::R_PPC_ADDR16_LO: + writeInt16BE(LocalAddress, applyPPClo(Value + Addend)); + break; + case ELF::R_PPC_ADDR16_HI: + writeInt16BE(LocalAddress, applyPPChi(Value + Addend)); + break; + case ELF::R_PPC_ADDR16_HA: + writeInt16BE(LocalAddress, applyPPCha(Value + Addend)); + break; + } +} + +void RuntimeDyldELF::resolvePPC64Relocation(const SectionEntry &Section, + uint64_t Offset, uint64_t Value, + uint32_t Type, int64_t Addend) { + uint8_t *LocalAddress = Section.getAddressWithOffset(Offset); + switch (Type) { + default: + llvm_unreachable("Relocation type not implemented yet!"); + break; + case ELF::R_PPC64_ADDR16: + writeInt16BE(LocalAddress, applyPPClo(Value + Addend)); + break; + case ELF::R_PPC64_ADDR16_DS: + writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3); + break; + case ELF::R_PPC64_ADDR16_LO: + writeInt16BE(LocalAddress, applyPPClo(Value + Addend)); + break; + case ELF::R_PPC64_ADDR16_LO_DS: + writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3); + break; + case ELF::R_PPC64_ADDR16_HI: + writeInt16BE(LocalAddress, applyPPChi(Value + Addend)); + break; + case ELF::R_PPC64_ADDR16_HA: + writeInt16BE(LocalAddress, applyPPCha(Value + Addend)); + break; + case ELF::R_PPC64_ADDR16_HIGHER: + writeInt16BE(LocalAddress, applyPPChigher(Value + Addend)); + break; + case ELF::R_PPC64_ADDR16_HIGHERA: + writeInt16BE(LocalAddress, applyPPChighera(Value + Addend)); + break; + case ELF::R_PPC64_ADDR16_HIGHEST: + writeInt16BE(LocalAddress, applyPPChighest(Value + Addend)); + break; + case ELF::R_PPC64_ADDR16_HIGHESTA: + writeInt16BE(LocalAddress, applyPPChighesta(Value + Addend)); + break; + case ELF::R_PPC64_ADDR14: { + assert(((Value + Addend) & 3) == 0); + // Preserve the AA/LK bits in the branch instruction + uint8_t aalk = *(LocalAddress + 3); + writeInt16BE(LocalAddress + 2, (aalk & 3) | ((Value + Addend) & 0xfffc)); + } break; + case ELF::R_PPC64_REL16_LO: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + uint64_t Delta = Value - FinalAddress + Addend; + writeInt16BE(LocalAddress, applyPPClo(Delta)); + } break; + case ELF::R_PPC64_REL16_HI: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + uint64_t Delta = Value - FinalAddress + Addend; + writeInt16BE(LocalAddress, applyPPChi(Delta)); + } break; + case ELF::R_PPC64_REL16_HA: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + uint64_t Delta = Value - FinalAddress + Addend; + writeInt16BE(LocalAddress, applyPPCha(Delta)); + } break; + case ELF::R_PPC64_ADDR32: { + int32_t Result = static_cast<int32_t>(Value + Addend); + if (SignExtend32<32>(Result) != Result) + llvm_unreachable("Relocation R_PPC64_ADDR32 overflow"); + writeInt32BE(LocalAddress, Result); + } break; + case ELF::R_PPC64_REL24: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend); + if (SignExtend32<26>(delta) != delta) + llvm_unreachable("Relocation R_PPC64_REL24 overflow"); + // Generates a 'bl <address>' instruction + writeInt32BE(LocalAddress, 0x48000001 | (delta & 0x03FFFFFC)); + } break; + case ELF::R_PPC64_REL32: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend); + if (SignExtend32<32>(delta) != delta) + llvm_unreachable("Relocation R_PPC64_REL32 overflow"); + writeInt32BE(LocalAddress, delta); + } break; + case ELF::R_PPC64_REL64: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset); + uint64_t Delta = Value - FinalAddress + Addend; + writeInt64BE(LocalAddress, Delta); + } break; + case ELF::R_PPC64_ADDR64: + writeInt64BE(LocalAddress, Value + Addend); + break; + } +} + +void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section, + uint64_t Offset, uint64_t Value, + uint32_t Type, int64_t Addend) { + uint8_t *LocalAddress = Section.getAddressWithOffset(Offset); + switch (Type) { + default: + llvm_unreachable("Relocation type not implemented yet!"); + break; + case ELF::R_390_PC16DBL: + case ELF::R_390_PLT16DBL: { + int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset); + assert(int16_t(Delta / 2) * 2 == Delta && "R_390_PC16DBL overflow"); + writeInt16BE(LocalAddress, Delta / 2); + break; + } + case ELF::R_390_PC32DBL: + case ELF::R_390_PLT32DBL: { + int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset); + assert(int32_t(Delta / 2) * 2 == Delta && "R_390_PC32DBL overflow"); + writeInt32BE(LocalAddress, Delta / 2); + break; + } + case ELF::R_390_PC32: { + int64_t Delta = (Value + Addend) - Section.getLoadAddressWithOffset(Offset); + assert(int32_t(Delta) == Delta && "R_390_PC32 overflow"); + writeInt32BE(LocalAddress, Delta); + break; + } + case ELF::R_390_64: + writeInt64BE(LocalAddress, Value + Addend); + break; + } +} + +// The target location for the relocation is described by RE.SectionID and +// RE.Offset. RE.SectionID can be used to find the SectionEntry. Each +// SectionEntry has three members describing its location. +// SectionEntry::Address is the address at which the section has been loaded +// into memory in the current (host) process. SectionEntry::LoadAddress is the +// address that the section will have in the target process. +// SectionEntry::ObjAddress is the address of the bits for this section in the +// original emitted object image (also in the current address space). +// +// Relocations will be applied as if the section were loaded at +// SectionEntry::LoadAddress, but they will be applied at an address based +// on SectionEntry::Address. SectionEntry::ObjAddress will be used to refer to +// Target memory contents if they are required for value calculations. +// +// The Value parameter here is the load address of the symbol for the +// relocation to be applied. For relocations which refer to symbols in the +// current object Value will be the LoadAddress of the section in which +// the symbol resides (RE.Addend provides additional information about the +// symbol location). For external symbols, Value will be the address of the +// symbol in the target address space. +void RuntimeDyldELF::resolveRelocation(const RelocationEntry &RE, + uint64_t Value) { + const SectionEntry &Section = Sections[RE.SectionID]; + return resolveRelocation(Section, RE.Offset, Value, RE.RelType, RE.Addend, + RE.SymOffset, RE.SectionID); +} + +void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section, + uint64_t Offset, uint64_t Value, + uint32_t Type, int64_t Addend, + uint64_t SymOffset, SID SectionID) { + switch (Arch) { + case Triple::x86_64: + resolveX86_64Relocation(Section, Offset, Value, Type, Addend, SymOffset); + break; + case Triple::x86: + resolveX86Relocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type, + (uint32_t)(Addend & 0xffffffffL)); + break; + case Triple::aarch64: + case Triple::aarch64_be: + resolveAArch64Relocation(Section, Offset, Value, Type, Addend); + break; + case Triple::arm: // Fall through. + case Triple::armeb: + case Triple::thumb: + case Triple::thumbeb: + resolveARMRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type, + (uint32_t)(Addend & 0xffffffffL)); + break; + case Triple::mips: // Fall through. + case Triple::mipsel: + case Triple::mips64: + case Triple::mips64el: + if (IsMipsO32ABI) + resolveMIPSRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), + Type, (uint32_t)(Addend & 0xffffffffL)); + else if (IsMipsN64ABI) + resolveMIPS64Relocation(Section, Offset, Value, Type, Addend, SymOffset, + SectionID); + else + llvm_unreachable("Mips ABI not handled"); + break; + case Triple::ppc: + resolvePPC32Relocation(Section, Offset, Value, Type, Addend); + break; + case Triple::ppc64: // Fall through. + case Triple::ppc64le: + resolvePPC64Relocation(Section, Offset, Value, Type, Addend); + break; + case Triple::systemz: + resolveSystemZRelocation(Section, Offset, Value, Type, Addend); + break; + default: + llvm_unreachable("Unsupported CPU type!"); + } +} + +void *RuntimeDyldELF::computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const { + return (void *)(Sections[SectionID].getObjAddress() + Offset); +} + +void RuntimeDyldELF::processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value) { + RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, Value.Offset); + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); +} + +uint32_t RuntimeDyldELF::getMatchingLoRelocation(uint32_t RelType, + bool IsLocal) const { + switch (RelType) { + case ELF::R_MICROMIPS_GOT16: + if (IsLocal) + return ELF::R_MICROMIPS_LO16; + break; + case ELF::R_MICROMIPS_HI16: + return ELF::R_MICROMIPS_LO16; + case ELF::R_MIPS_GOT16: + if (IsLocal) + return ELF::R_MIPS_LO16; + break; + case ELF::R_MIPS_HI16: + return ELF::R_MIPS_LO16; + case ELF::R_MIPS_PCHI16: + return ELF::R_MIPS_PCLO16; + default: + break; + } + return ELF::R_MIPS_NONE; +} + +relocation_iterator RuntimeDyldELF::processRelocationRef( + unsigned SectionID, relocation_iterator RelI, const ObjectFile &O, + ObjSectionToIDMap &ObjSectionToID, StubMap &Stubs) { + const auto &Obj = cast<ELFObjectFileBase>(O); + uint64_t RelType = RelI->getType(); + ErrorOr<int64_t> AddendOrErr = ELFRelocationRef(*RelI).getAddend(); + int64_t Addend = AddendOrErr ? *AddendOrErr : 0; + elf_symbol_iterator Symbol = RelI->getSymbol(); + + // Obtain the symbol name which is referenced in the relocation + StringRef TargetName; + if (Symbol != Obj.symbol_end()) { + ErrorOr<StringRef> TargetNameOrErr = Symbol->getName(); + if (std::error_code EC = TargetNameOrErr.getError()) + report_fatal_error(EC.message()); + TargetName = *TargetNameOrErr; + } + DEBUG(dbgs() << "\t\tRelType: " << RelType << " Addend: " << Addend + << " TargetName: " << TargetName << "\n"); + RelocationValueRef Value; + // First search for the symbol in the local symbol table + SymbolRef::Type SymType = SymbolRef::ST_Unknown; + + // Search for the symbol in the global symbol table + RTDyldSymbolTable::const_iterator gsi = GlobalSymbolTable.end(); + if (Symbol != Obj.symbol_end()) { + gsi = GlobalSymbolTable.find(TargetName.data()); + SymType = Symbol->getType(); + } + if (gsi != GlobalSymbolTable.end()) { + const auto &SymInfo = gsi->second; + Value.SectionID = SymInfo.getSectionID(); + Value.Offset = SymInfo.getOffset(); + Value.Addend = SymInfo.getOffset() + Addend; + } else { + switch (SymType) { + case SymbolRef::ST_Debug: { + // TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously + // and can be changed by another developers. Maybe best way is add + // a new symbol type ST_Section to SymbolRef and use it. + section_iterator si = *Symbol->getSection(); + if (si == Obj.section_end()) + llvm_unreachable("Symbol section not found, bad object file format!"); + DEBUG(dbgs() << "\t\tThis is section symbol\n"); + bool isCode = si->isText(); + Value.SectionID = findOrEmitSection(Obj, (*si), isCode, ObjSectionToID); + Value.Addend = Addend; + break; + } + case SymbolRef::ST_Data: + case SymbolRef::ST_Unknown: { + Value.SymbolName = TargetName.data(); + Value.Addend = Addend; + + // Absolute relocations will have a zero symbol ID (STN_UNDEF), which + // will manifest here as a NULL symbol name. + // We can set this as a valid (but empty) symbol name, and rely + // on addRelocationForSymbol to handle this. + if (!Value.SymbolName) + Value.SymbolName = ""; + break; + } + default: + llvm_unreachable("Unresolved symbol type!"); + break; + } + } + + uint64_t Offset = RelI->getOffset(); + + DEBUG(dbgs() << "\t\tSectionID: " << SectionID << " Offset: " << Offset + << "\n"); + if ((Arch == Triple::aarch64 || Arch == Triple::aarch64_be) && + (RelType == ELF::R_AARCH64_CALL26 || RelType == ELF::R_AARCH64_JUMP26)) { + // This is an AArch64 branch relocation, need to use a stub function. + DEBUG(dbgs() << "\t\tThis is an AArch64 branch relocation."); + SectionEntry &Section = Sections[SectionID]; + + // Look for an existing stub. + StubMap::const_iterator i = Stubs.find(Value); + if (i != Stubs.end()) { + resolveRelocation(Section, Offset, + (uint64_t)Section.getAddressWithOffset(i->second), + RelType, 0); + DEBUG(dbgs() << " Stub function found\n"); + } else { + // Create a new stub function. + DEBUG(dbgs() << " Create a new stub function\n"); + Stubs[Value] = Section.getStubOffset(); + uint8_t *StubTargetAddr = createStubFunction( + Section.getAddressWithOffset(Section.getStubOffset())); + + RelocationEntry REmovz_g3(SectionID, + StubTargetAddr - Section.getAddress(), + ELF::R_AARCH64_MOVW_UABS_G3, Value.Addend); + RelocationEntry REmovk_g2(SectionID, StubTargetAddr - + Section.getAddress() + 4, + ELF::R_AARCH64_MOVW_UABS_G2_NC, Value.Addend); + RelocationEntry REmovk_g1(SectionID, StubTargetAddr - + Section.getAddress() + 8, + ELF::R_AARCH64_MOVW_UABS_G1_NC, Value.Addend); + RelocationEntry REmovk_g0(SectionID, StubTargetAddr - + Section.getAddress() + 12, + ELF::R_AARCH64_MOVW_UABS_G0_NC, Value.Addend); + + if (Value.SymbolName) { + addRelocationForSymbol(REmovz_g3, Value.SymbolName); + addRelocationForSymbol(REmovk_g2, Value.SymbolName); + addRelocationForSymbol(REmovk_g1, Value.SymbolName); + addRelocationForSymbol(REmovk_g0, Value.SymbolName); + } else { + addRelocationForSection(REmovz_g3, Value.SectionID); + addRelocationForSection(REmovk_g2, Value.SectionID); + addRelocationForSection(REmovk_g1, Value.SectionID); + addRelocationForSection(REmovk_g0, Value.SectionID); + } + resolveRelocation(Section, Offset, + reinterpret_cast<uint64_t>(Section.getAddressWithOffset( + Section.getStubOffset())), + RelType, 0); + Section.advanceStubOffset(getMaxStubSize()); + } + } else if (Arch == Triple::arm) { + if (RelType == ELF::R_ARM_PC24 || RelType == ELF::R_ARM_CALL || + RelType == ELF::R_ARM_JUMP24) { + // This is an ARM branch relocation, need to use a stub function. + DEBUG(dbgs() << "\t\tThis is an ARM branch relocation."); + SectionEntry &Section = Sections[SectionID]; + + // Look for an existing stub. + StubMap::const_iterator i = Stubs.find(Value); + if (i != Stubs.end()) { + resolveRelocation( + Section, Offset, + reinterpret_cast<uint64_t>(Section.getAddressWithOffset(i->second)), + RelType, 0); + DEBUG(dbgs() << " Stub function found\n"); + } else { + // Create a new stub function. + DEBUG(dbgs() << " Create a new stub function\n"); + Stubs[Value] = Section.getStubOffset(); + uint8_t *StubTargetAddr = createStubFunction( + Section.getAddressWithOffset(Section.getStubOffset())); + RelocationEntry RE(SectionID, StubTargetAddr - Section.getAddress(), + ELF::R_ARM_ABS32, Value.Addend); + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + + resolveRelocation(Section, Offset, reinterpret_cast<uint64_t>( + Section.getAddressWithOffset( + Section.getStubOffset())), + RelType, 0); + Section.advanceStubOffset(getMaxStubSize()); + } + } else { + uint32_t *Placeholder = + reinterpret_cast<uint32_t*>(computePlaceholderAddress(SectionID, Offset)); + if (RelType == ELF::R_ARM_PREL31 || RelType == ELF::R_ARM_TARGET1 || + RelType == ELF::R_ARM_ABS32) { + Value.Addend += *Placeholder; + } else if (RelType == ELF::R_ARM_MOVW_ABS_NC || RelType == ELF::R_ARM_MOVT_ABS) { + // See ELF for ARM documentation + Value.Addend += (int16_t)((*Placeholder & 0xFFF) | (((*Placeholder >> 16) & 0xF) << 12)); + } + processSimpleRelocation(SectionID, Offset, RelType, Value); + } + } else if (IsMipsO32ABI) { + uint8_t *Placeholder = reinterpret_cast<uint8_t *>( + computePlaceholderAddress(SectionID, Offset)); + uint32_t Opcode = readBytesUnaligned(Placeholder, 4); + if (RelType == ELF::R_MIPS_26) { + // This is an Mips branch relocation, need to use a stub function. + DEBUG(dbgs() << "\t\tThis is a Mips branch relocation."); + SectionEntry &Section = Sections[SectionID]; + + // Extract the addend from the instruction. + // We shift up by two since the Value will be down shifted again + // when applying the relocation. + uint32_t Addend = (Opcode & 0x03ffffff) << 2; + + Value.Addend += Addend; + + // Look up for existing stub. + StubMap::const_iterator i = Stubs.find(Value); + if (i != Stubs.end()) { + RelocationEntry RE(SectionID, Offset, RelType, i->second); + addRelocationForSection(RE, SectionID); + DEBUG(dbgs() << " Stub function found\n"); + } else { + // Create a new stub function. + DEBUG(dbgs() << " Create a new stub function\n"); + Stubs[Value] = Section.getStubOffset(); + uint8_t *StubTargetAddr = createStubFunction( + Section.getAddressWithOffset(Section.getStubOffset())); + + // Creating Hi and Lo relocations for the filled stub instructions. + RelocationEntry REHi(SectionID, StubTargetAddr - Section.getAddress(), + ELF::R_MIPS_HI16, Value.Addend); + RelocationEntry RELo(SectionID, + StubTargetAddr - Section.getAddress() + 4, + ELF::R_MIPS_LO16, Value.Addend); + + if (Value.SymbolName) { + addRelocationForSymbol(REHi, Value.SymbolName); + addRelocationForSymbol(RELo, Value.SymbolName); + } + else { + addRelocationForSection(REHi, Value.SectionID); + addRelocationForSection(RELo, Value.SectionID); + } + + RelocationEntry RE(SectionID, Offset, RelType, Section.getStubOffset()); + addRelocationForSection(RE, SectionID); + Section.advanceStubOffset(getMaxStubSize()); + } + } else if (RelType == ELF::R_MIPS_HI16 || RelType == ELF::R_MIPS_PCHI16) { + int64_t Addend = (Opcode & 0x0000ffff) << 16; + RelocationEntry RE(SectionID, Offset, RelType, Addend); + PendingRelocs.push_back(std::make_pair(Value, RE)); + } else if (RelType == ELF::R_MIPS_LO16 || RelType == ELF::R_MIPS_PCLO16) { + int64_t Addend = Value.Addend + SignExtend32<16>(Opcode & 0x0000ffff); + for (auto I = PendingRelocs.begin(); I != PendingRelocs.end();) { + const RelocationValueRef &MatchingValue = I->first; + RelocationEntry &Reloc = I->second; + if (MatchingValue == Value && + RelType == getMatchingLoRelocation(Reloc.RelType) && + SectionID == Reloc.SectionID) { + Reloc.Addend += Addend; + if (Value.SymbolName) + addRelocationForSymbol(Reloc, Value.SymbolName); + else + addRelocationForSection(Reloc, Value.SectionID); + I = PendingRelocs.erase(I); + } else + ++I; + } + RelocationEntry RE(SectionID, Offset, RelType, Addend); + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + } else { + if (RelType == ELF::R_MIPS_32) + Value.Addend += Opcode; + else if (RelType == ELF::R_MIPS_PC16) + Value.Addend += SignExtend32<18>((Opcode & 0x0000ffff) << 2); + else if (RelType == ELF::R_MIPS_PC19_S2) + Value.Addend += SignExtend32<21>((Opcode & 0x0007ffff) << 2); + else if (RelType == ELF::R_MIPS_PC21_S2) + Value.Addend += SignExtend32<23>((Opcode & 0x001fffff) << 2); + else if (RelType == ELF::R_MIPS_PC26_S2) + Value.Addend += SignExtend32<28>((Opcode & 0x03ffffff) << 2); + processSimpleRelocation(SectionID, Offset, RelType, Value); + } + } else if (IsMipsN64ABI) { + uint32_t r_type = RelType & 0xff; + RelocationEntry RE(SectionID, Offset, RelType, Value.Addend); + if (r_type == ELF::R_MIPS_CALL16 || r_type == ELF::R_MIPS_GOT_PAGE + || r_type == ELF::R_MIPS_GOT_DISP) { + StringMap<uint64_t>::iterator i = GOTSymbolOffsets.find(TargetName); + if (i != GOTSymbolOffsets.end()) + RE.SymOffset = i->second; + else { + RE.SymOffset = allocateGOTEntries(SectionID, 1); + GOTSymbolOffsets[TargetName] = RE.SymOffset; + } + } + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) { + if (RelType == ELF::R_PPC64_REL24) { + // Determine ABI variant in use for this object. + unsigned AbiVariant; + Obj.getPlatformFlags(AbiVariant); + AbiVariant &= ELF::EF_PPC64_ABI; + // A PPC branch relocation will need a stub function if the target is + // an external symbol (Symbol::ST_Unknown) or if the target address + // is not within the signed 24-bits branch address. + SectionEntry &Section = Sections[SectionID]; + uint8_t *Target = Section.getAddressWithOffset(Offset); + bool RangeOverflow = false; + if (SymType != SymbolRef::ST_Unknown) { + if (AbiVariant != 2) { + // In the ELFv1 ABI, a function call may point to the .opd entry, + // so the final symbol value is calculated based on the relocation + // values in the .opd section. + findOPDEntrySection(Obj, ObjSectionToID, Value); + } else { + // In the ELFv2 ABI, a function symbol may provide a local entry + // point, which must be used for direct calls. + uint8_t SymOther = Symbol->getOther(); + Value.Addend += ELF::decodePPC64LocalEntryOffset(SymOther); + } + uint8_t *RelocTarget = + Sections[Value.SectionID].getAddressWithOffset(Value.Addend); + int32_t delta = static_cast<int32_t>(Target - RelocTarget); + // If it is within 26-bits branch range, just set the branch target + if (SignExtend32<26>(delta) == delta) { + RelocationEntry RE(SectionID, Offset, RelType, Value.Addend); + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + } else { + RangeOverflow = true; + } + } + if (SymType == SymbolRef::ST_Unknown || RangeOverflow) { + // It is an external symbol (SymbolRef::ST_Unknown) or within a range + // larger than 24-bits. + StubMap::const_iterator i = Stubs.find(Value); + if (i != Stubs.end()) { + // Symbol function stub already created, just relocate to it + resolveRelocation(Section, Offset, + reinterpret_cast<uint64_t>( + Section.getAddressWithOffset(i->second)), + RelType, 0); + DEBUG(dbgs() << " Stub function found\n"); + } else { + // Create a new stub function. + DEBUG(dbgs() << " Create a new stub function\n"); + Stubs[Value] = Section.getStubOffset(); + uint8_t *StubTargetAddr = createStubFunction( + Section.getAddressWithOffset(Section.getStubOffset()), + AbiVariant); + RelocationEntry RE(SectionID, StubTargetAddr - Section.getAddress(), + ELF::R_PPC64_ADDR64, Value.Addend); + + // Generates the 64-bits address loads as exemplified in section + // 4.5.1 in PPC64 ELF ABI. Note that the relocations need to + // apply to the low part of the instructions, so we have to update + // the offset according to the target endianness. + uint64_t StubRelocOffset = StubTargetAddr - Section.getAddress(); + if (!IsTargetLittleEndian) + StubRelocOffset += 2; + + RelocationEntry REhst(SectionID, StubRelocOffset + 0, + ELF::R_PPC64_ADDR16_HIGHEST, Value.Addend); + RelocationEntry REhr(SectionID, StubRelocOffset + 4, + ELF::R_PPC64_ADDR16_HIGHER, Value.Addend); + RelocationEntry REh(SectionID, StubRelocOffset + 12, + ELF::R_PPC64_ADDR16_HI, Value.Addend); + RelocationEntry REl(SectionID, StubRelocOffset + 16, + ELF::R_PPC64_ADDR16_LO, Value.Addend); + + if (Value.SymbolName) { + addRelocationForSymbol(REhst, Value.SymbolName); + addRelocationForSymbol(REhr, Value.SymbolName); + addRelocationForSymbol(REh, Value.SymbolName); + addRelocationForSymbol(REl, Value.SymbolName); + } else { + addRelocationForSection(REhst, Value.SectionID); + addRelocationForSection(REhr, Value.SectionID); + addRelocationForSection(REh, Value.SectionID); + addRelocationForSection(REl, Value.SectionID); + } + + resolveRelocation(Section, Offset, reinterpret_cast<uint64_t>( + Section.getAddressWithOffset( + Section.getStubOffset())), + RelType, 0); + Section.advanceStubOffset(getMaxStubSize()); + } + if (SymType == SymbolRef::ST_Unknown) { + // Restore the TOC for external calls + if (AbiVariant == 2) + writeInt32BE(Target + 4, 0xE8410018); // ld r2,28(r1) + else + writeInt32BE(Target + 4, 0xE8410028); // ld r2,40(r1) + } + } + } else if (RelType == ELF::R_PPC64_TOC16 || + RelType == ELF::R_PPC64_TOC16_DS || + RelType == ELF::R_PPC64_TOC16_LO || + RelType == ELF::R_PPC64_TOC16_LO_DS || + RelType == ELF::R_PPC64_TOC16_HI || + RelType == ELF::R_PPC64_TOC16_HA) { + // These relocations are supposed to subtract the TOC address from + // the final value. This does not fit cleanly into the RuntimeDyld + // scheme, since there may be *two* sections involved in determining + // the relocation value (the section of the symbol referred to by the + // relocation, and the TOC section associated with the current module). + // + // Fortunately, these relocations are currently only ever generated + // referring to symbols that themselves reside in the TOC, which means + // that the two sections are actually the same. Thus they cancel out + // and we can immediately resolve the relocation right now. + switch (RelType) { + case ELF::R_PPC64_TOC16: RelType = ELF::R_PPC64_ADDR16; break; + case ELF::R_PPC64_TOC16_DS: RelType = ELF::R_PPC64_ADDR16_DS; break; + case ELF::R_PPC64_TOC16_LO: RelType = ELF::R_PPC64_ADDR16_LO; break; + case ELF::R_PPC64_TOC16_LO_DS: RelType = ELF::R_PPC64_ADDR16_LO_DS; break; + case ELF::R_PPC64_TOC16_HI: RelType = ELF::R_PPC64_ADDR16_HI; break; + case ELF::R_PPC64_TOC16_HA: RelType = ELF::R_PPC64_ADDR16_HA; break; + default: llvm_unreachable("Wrong relocation type."); + } + + RelocationValueRef TOCValue; + findPPC64TOCSection(Obj, ObjSectionToID, TOCValue); + if (Value.SymbolName || Value.SectionID != TOCValue.SectionID) + llvm_unreachable("Unsupported TOC relocation."); + Value.Addend -= TOCValue.Addend; + resolveRelocation(Sections[SectionID], Offset, Value.Addend, RelType, 0); + } else { + // There are two ways to refer to the TOC address directly: either + // via a ELF::R_PPC64_TOC relocation (where both symbol and addend are + // ignored), or via any relocation that refers to the magic ".TOC." + // symbols (in which case the addend is respected). + if (RelType == ELF::R_PPC64_TOC) { + RelType = ELF::R_PPC64_ADDR64; + findPPC64TOCSection(Obj, ObjSectionToID, Value); + } else if (TargetName == ".TOC.") { + findPPC64TOCSection(Obj, ObjSectionToID, Value); + Value.Addend += Addend; + } + + RelocationEntry RE(SectionID, Offset, RelType, Value.Addend); + + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + } + } else if (Arch == Triple::systemz && + (RelType == ELF::R_390_PLT32DBL || RelType == ELF::R_390_GOTENT)) { + // Create function stubs for both PLT and GOT references, regardless of + // whether the GOT reference is to data or code. The stub contains the + // full address of the symbol, as needed by GOT references, and the + // executable part only adds an overhead of 8 bytes. + // + // We could try to conserve space by allocating the code and data + // parts of the stub separately. However, as things stand, we allocate + // a stub for every relocation, so using a GOT in JIT code should be + // no less space efficient than using an explicit constant pool. + DEBUG(dbgs() << "\t\tThis is a SystemZ indirect relocation."); + SectionEntry &Section = Sections[SectionID]; + + // Look for an existing stub. + StubMap::const_iterator i = Stubs.find(Value); + uintptr_t StubAddress; + if (i != Stubs.end()) { + StubAddress = uintptr_t(Section.getAddressWithOffset(i->second)); + DEBUG(dbgs() << " Stub function found\n"); + } else { + // Create a new stub function. + DEBUG(dbgs() << " Create a new stub function\n"); + + uintptr_t BaseAddress = uintptr_t(Section.getAddress()); + uintptr_t StubAlignment = getStubAlignment(); + StubAddress = + (BaseAddress + Section.getStubOffset() + StubAlignment - 1) & + -StubAlignment; + unsigned StubOffset = StubAddress - BaseAddress; + + Stubs[Value] = StubOffset; + createStubFunction((uint8_t *)StubAddress); + RelocationEntry RE(SectionID, StubOffset + 8, ELF::R_390_64, + Value.Offset); + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + Section.advanceStubOffset(getMaxStubSize()); + } + + if (RelType == ELF::R_390_GOTENT) + resolveRelocation(Section, Offset, StubAddress + 8, ELF::R_390_PC32DBL, + Addend); + else + resolveRelocation(Section, Offset, StubAddress, RelType, Addend); + } else if (Arch == Triple::x86_64) { + if (RelType == ELF::R_X86_64_PLT32) { + // The way the PLT relocations normally work is that the linker allocates + // the + // PLT and this relocation makes a PC-relative call into the PLT. The PLT + // entry will then jump to an address provided by the GOT. On first call, + // the + // GOT address will point back into PLT code that resolves the symbol. After + // the first call, the GOT entry points to the actual function. + // + // For local functions we're ignoring all of that here and just replacing + // the PLT32 relocation type with PC32, which will translate the relocation + // into a PC-relative call directly to the function. For external symbols we + // can't be sure the function will be within 2^32 bytes of the call site, so + // we need to create a stub, which calls into the GOT. This case is + // equivalent to the usual PLT implementation except that we use the stub + // mechanism in RuntimeDyld (which puts stubs at the end of the section) + // rather than allocating a PLT section. + if (Value.SymbolName) { + // This is a call to an external function. + // Look for an existing stub. + SectionEntry &Section = Sections[SectionID]; + StubMap::const_iterator i = Stubs.find(Value); + uintptr_t StubAddress; + if (i != Stubs.end()) { + StubAddress = uintptr_t(Section.getAddress()) + i->second; + DEBUG(dbgs() << " Stub function found\n"); + } else { + // Create a new stub function (equivalent to a PLT entry). + DEBUG(dbgs() << " Create a new stub function\n"); + + uintptr_t BaseAddress = uintptr_t(Section.getAddress()); + uintptr_t StubAlignment = getStubAlignment(); + StubAddress = + (BaseAddress + Section.getStubOffset() + StubAlignment - 1) & + -StubAlignment; + unsigned StubOffset = StubAddress - BaseAddress; + Stubs[Value] = StubOffset; + createStubFunction((uint8_t *)StubAddress); + + // Bump our stub offset counter + Section.advanceStubOffset(getMaxStubSize()); + + // Allocate a GOT Entry + uint64_t GOTOffset = allocateGOTEntries(SectionID, 1); + + // The load of the GOT address has an addend of -4 + resolveGOTOffsetRelocation(SectionID, StubOffset + 2, GOTOffset - 4); + + // Fill in the value of the symbol we're targeting into the GOT + addRelocationForSymbol( + computeGOTOffsetRE(SectionID, GOTOffset, 0, ELF::R_X86_64_64), + Value.SymbolName); + } + + // Make the target call a call into the stub table. + resolveRelocation(Section, Offset, StubAddress, ELF::R_X86_64_PC32, + Addend); + } else { + RelocationEntry RE(SectionID, Offset, ELF::R_X86_64_PC32, Value.Addend, + Value.Offset); + addRelocationForSection(RE, Value.SectionID); + } + } else if (RelType == ELF::R_X86_64_GOTPCREL) { + uint64_t GOTOffset = allocateGOTEntries(SectionID, 1); + resolveGOTOffsetRelocation(SectionID, Offset, GOTOffset + Addend); + + // Fill in the value of the symbol we're targeting into the GOT + RelocationEntry RE = computeGOTOffsetRE(SectionID, GOTOffset, Value.Offset, ELF::R_X86_64_64); + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + } else if (RelType == ELF::R_X86_64_PC32) { + Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset)); + processSimpleRelocation(SectionID, Offset, RelType, Value); + } else if (RelType == ELF::R_X86_64_PC64) { + Value.Addend += support::ulittle64_t::ref(computePlaceholderAddress(SectionID, Offset)); + processSimpleRelocation(SectionID, Offset, RelType, Value); + } else { + processSimpleRelocation(SectionID, Offset, RelType, Value); + } + } else { + if (Arch == Triple::x86) { + Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset)); + } + processSimpleRelocation(SectionID, Offset, RelType, Value); + } + return ++RelI; +} + +size_t RuntimeDyldELF::getGOTEntrySize() { + // We don't use the GOT in all of these cases, but it's essentially free + // to put them all here. + size_t Result = 0; + switch (Arch) { + case Triple::x86_64: + case Triple::aarch64: + case Triple::aarch64_be: + case Triple::ppc64: + case Triple::ppc64le: + case Triple::systemz: + Result = sizeof(uint64_t); + break; + case Triple::x86: + case Triple::arm: + case Triple::thumb: + Result = sizeof(uint32_t); + break; + case Triple::mips: + case Triple::mipsel: + case Triple::mips64: + case Triple::mips64el: + if (IsMipsO32ABI) + Result = sizeof(uint32_t); + else if (IsMipsN64ABI) + Result = sizeof(uint64_t); + else + llvm_unreachable("Mips ABI not handled"); + break; + default: + llvm_unreachable("Unsupported CPU type!"); + } + return Result; +} + +uint64_t RuntimeDyldELF::allocateGOTEntries(unsigned SectionID, unsigned no) +{ + (void)SectionID; // The GOT Section is the same for all section in the object file + if (GOTSectionID == 0) { + GOTSectionID = Sections.size(); + // Reserve a section id. We'll allocate the section later + // once we know the total size + Sections.push_back(SectionEntry(".got", nullptr, 0, 0, 0)); + } + uint64_t StartOffset = CurrentGOTIndex * getGOTEntrySize(); + CurrentGOTIndex += no; + return StartOffset; +} + +void RuntimeDyldELF::resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset, uint64_t GOTOffset) +{ + // Fill in the relative address of the GOT Entry into the stub + RelocationEntry GOTRE(SectionID, Offset, ELF::R_X86_64_PC32, GOTOffset); + addRelocationForSection(GOTRE, GOTSectionID); +} + +RelocationEntry RuntimeDyldELF::computeGOTOffsetRE(unsigned SectionID, uint64_t GOTOffset, uint64_t SymbolOffset, + uint32_t Type) +{ + (void)SectionID; // The GOT Section is the same for all section in the object file + return RelocationEntry(GOTSectionID, GOTOffset, Type, SymbolOffset); +} + +void RuntimeDyldELF::finalizeLoad(const ObjectFile &Obj, + ObjSectionToIDMap &SectionMap) { + if (IsMipsO32ABI) + if (!PendingRelocs.empty()) + report_fatal_error("Can't find matching LO16 reloc"); + + // If necessary, allocate the global offset table + if (GOTSectionID != 0) { + // Allocate memory for the section + size_t TotalSize = CurrentGOTIndex * getGOTEntrySize(); + uint8_t *Addr = MemMgr.allocateDataSection(TotalSize, getGOTEntrySize(), + GOTSectionID, ".got", false); + if (!Addr) + report_fatal_error("Unable to allocate memory for GOT!"); + + Sections[GOTSectionID] = + SectionEntry(".got", Addr, TotalSize, TotalSize, 0); + + if (Checker) + Checker->registerSection(Obj.getFileName(), GOTSectionID); + + // For now, initialize all GOT entries to zero. We'll fill them in as + // needed when GOT-based relocations are applied. + memset(Addr, 0, TotalSize); + if (IsMipsN64ABI) { + // To correctly resolve Mips GOT relocations, we need a mapping from + // object's sections to GOTs. + for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end(); + SI != SE; ++SI) { + if (SI->relocation_begin() != SI->relocation_end()) { + section_iterator RelocatedSection = SI->getRelocatedSection(); + ObjSectionToIDMap::iterator i = SectionMap.find(*RelocatedSection); + assert (i != SectionMap.end()); + SectionToGOTMap[i->second] = GOTSectionID; + } + } + GOTSymbolOffsets.clear(); + } + } + + // Look for and record the EH frame section. + ObjSectionToIDMap::iterator i, e; + for (i = SectionMap.begin(), e = SectionMap.end(); i != e; ++i) { + const SectionRef &Section = i->first; + StringRef Name; + Section.getName(Name); + if (Name == ".eh_frame") { + UnregisteredEHFrameSections.push_back(i->second); + break; + } + } + + GOTSectionID = 0; + CurrentGOTIndex = 0; +} + +bool RuntimeDyldELF::isCompatibleFile(const object::ObjectFile &Obj) const { + return Obj.isELF(); +} + +bool RuntimeDyldELF::relocationNeedsStub(const RelocationRef &R) const { + if (Arch != Triple::x86_64) + return true; // Conservative answer + + switch (R.getType()) { + default: + return true; // Conservative answer + + + case ELF::R_X86_64_GOTPCREL: + case ELF::R_X86_64_PC32: + case ELF::R_X86_64_PC64: + case ELF::R_X86_64_64: + // We know that these reloation types won't need a stub function. This list + // can be extended as needed. + return false; + } +} + +} // namespace llvm diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h new file mode 100644 index 0000000..041811d --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h @@ -0,0 +1,180 @@ +//===-- RuntimeDyldELF.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// ELF support for MC-JIT runtime dynamic linker. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H + +#include "RuntimeDyldImpl.h" +#include "llvm/ADT/DenseMap.h" + +using namespace llvm; + +namespace llvm { + +class RuntimeDyldELF : public RuntimeDyldImpl { + + void resolveRelocation(const SectionEntry &Section, uint64_t Offset, + uint64_t Value, uint32_t Type, int64_t Addend, + uint64_t SymOffset = 0, SID SectionID = 0); + + void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset, + uint64_t Value, uint32_t Type, int64_t Addend, + uint64_t SymOffset); + + void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset, + uint32_t Value, uint32_t Type, int32_t Addend); + + void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset, + uint64_t Value, uint32_t Type, int64_t Addend); + + void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset, + uint32_t Value, uint32_t Type, int32_t Addend); + + void resolveMIPSRelocation(const SectionEntry &Section, uint64_t Offset, + uint32_t Value, uint32_t Type, int32_t Addend); + + void resolvePPC32Relocation(const SectionEntry &Section, uint64_t Offset, + uint64_t Value, uint32_t Type, int64_t Addend); + + void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset, + uint64_t Value, uint32_t Type, int64_t Addend); + + void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset, + uint64_t Value, uint32_t Type, int64_t Addend); + + void resolveMIPS64Relocation(const SectionEntry &Section, uint64_t Offset, + uint64_t Value, uint32_t Type, int64_t Addend, + uint64_t SymOffset, SID SectionID); + + int64_t evaluateMIPS64Relocation(const SectionEntry &Section, + uint64_t Offset, uint64_t Value, + uint32_t Type, int64_t Addend, + uint64_t SymOffset, SID SectionID); + + void applyMIPS64Relocation(uint8_t *TargetPtr, int64_t CalculatedValue, + uint32_t Type); + + unsigned getMaxStubSize() override { + if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be) + return 20; // movz; movk; movk; movk; br + if (Arch == Triple::arm || Arch == Triple::thumb) + return 8; // 32-bit instruction and 32-bit address + else if (IsMipsO32ABI) + return 16; + else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) + return 44; + else if (Arch == Triple::x86_64) + return 6; // 2-byte jmp instruction + 32-bit relative address + else if (Arch == Triple::systemz) + return 16; + else + return 0; + } + + unsigned getStubAlignment() override { + if (Arch == Triple::systemz) + return 8; + else + return 1; + } + + void setMipsABI(const ObjectFile &Obj) override; + + void findPPC64TOCSection(const ELFObjectFileBase &Obj, + ObjSectionToIDMap &LocalSections, + RelocationValueRef &Rel); + void findOPDEntrySection(const ELFObjectFileBase &Obj, + ObjSectionToIDMap &LocalSections, + RelocationValueRef &Rel); + + size_t getGOTEntrySize(); + + SectionEntry &getSection(unsigned SectionID) { return Sections[SectionID]; } + + // Allocate no GOT entries for use in the given section. + uint64_t allocateGOTEntries(unsigned SectionID, unsigned no); + + // Resolve the relvative address of GOTOffset in Section ID and place + // it at the given Offset + void resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset, + uint64_t GOTOffset); + + // For a GOT entry referenced from SectionID, compute a relocation entry + // that will place the final resolved value in the GOT slot + RelocationEntry computeGOTOffsetRE(unsigned SectionID, + uint64_t GOTOffset, + uint64_t SymbolOffset, + unsigned Type); + + // Compute the address in memory where we can find the placeholder + void *computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const; + + // Split out common case for createing the RelocationEntry for when the relocation requires + // no particular advanced processing. + void processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value); + + // Return matching *LO16 relocation (Mips specific) + uint32_t getMatchingLoRelocation(uint32_t RelType, + bool IsLocal = false) const; + + // The tentative ID for the GOT section + unsigned GOTSectionID; + + // Records the current number of allocated slots in the GOT + // (This would be equivalent to GOTEntries.size() were it not for relocations + // that consume more than one slot) + unsigned CurrentGOTIndex; + + // A map from section to a GOT section that has entries for section's GOT + // relocations. (Mips64 specific) + DenseMap<SID, SID> SectionToGOTMap; + + // A map to avoid duplicate got entries (Mips64 specific) + StringMap<uint64_t> GOTSymbolOffsets; + + // *HI16 relocations will be added for resolving when we find matching + // *LO16 part. (Mips specific) + SmallVector<std::pair<RelocationValueRef, RelocationEntry>, 8> PendingRelocs; + + // When a module is loaded we save the SectionID of the EH frame section + // in a table until we receive a request to register all unregistered + // EH frame sections with the memory manager. + SmallVector<SID, 2> UnregisteredEHFrameSections; + SmallVector<SID, 2> RegisteredEHFrameSections; + + bool relocationNeedsStub(const RelocationRef &R) const override; + +public: + RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver); + ~RuntimeDyldELF() override; + + std::unique_ptr<RuntimeDyld::LoadedObjectInfo> + loadObject(const object::ObjectFile &O) override; + + void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override; + relocation_iterator + processRelocationRef(unsigned SectionID, relocation_iterator RelI, + const ObjectFile &Obj, + ObjSectionToIDMap &ObjSectionToID, + StubMap &Stubs) override; + bool isCompatibleFile(const object::ObjectFile &Obj) const override; + void registerEHFrames() override; + void deregisterEHFrames() override; + void finalizeLoad(const ObjectFile &Obj, + ObjSectionToIDMap &SectionMap) override; +}; + +} // end namespace llvm + +#endif diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h new file mode 100644 index 0000000..dafd3c8 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h @@ -0,0 +1,503 @@ +//===-- RuntimeDyldImpl.h - Run-time dynamic linker for MC-JIT --*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// Interface for the implementations of runtime dynamic linker facilities. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDIMPL_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDIMPL_H + +#include "llvm/ADT/DenseMap.h" +#include "llvm/ADT/SmallVector.h" +#include "llvm/ADT/StringMap.h" +#include "llvm/ADT/Triple.h" +#include "llvm/ExecutionEngine/RTDyldMemoryManager.h" +#include "llvm/ExecutionEngine/RuntimeDyld.h" +#include "llvm/ExecutionEngine/RuntimeDyldChecker.h" +#include "llvm/Object/ObjectFile.h" +#include "llvm/Support/Debug.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/Format.h" +#include "llvm/Support/Host.h" +#include "llvm/Support/Mutex.h" +#include "llvm/Support/SwapByteOrder.h" +#include "llvm/Support/raw_ostream.h" +#include <map> +#include <unordered_map> +#include <system_error> + +using namespace llvm; +using namespace llvm::object; + +namespace llvm { + + // Helper for extensive error checking in debug builds. +inline std::error_code Check(std::error_code Err) { + if (Err) { + report_fatal_error(Err.message()); + } + return Err; +} + +class Twine; + +/// SectionEntry - represents a section emitted into memory by the dynamic +/// linker. +class SectionEntry { + /// Name - section name. + std::string Name; + + /// Address - address in the linker's memory where the section resides. + uint8_t *Address; + + /// Size - section size. Doesn't include the stubs. + size_t Size; + + /// LoadAddress - the address of the section in the target process's memory. + /// Used for situations in which JIT-ed code is being executed in the address + /// space of a separate process. If the code executes in the same address + /// space where it was JIT-ed, this just equals Address. + uint64_t LoadAddress; + + /// StubOffset - used for architectures with stub functions for far + /// relocations (like ARM). + uintptr_t StubOffset; + + /// The total amount of space allocated for this section. This includes the + /// section size and the maximum amount of space that the stubs can occupy. + size_t AllocationSize; + + /// ObjAddress - address of the section in the in-memory object file. Used + /// for calculating relocations in some object formats (like MachO). + uintptr_t ObjAddress; + +public: + SectionEntry(StringRef name, uint8_t *address, size_t size, + size_t allocationSize, uintptr_t objAddress) + : Name(name), Address(address), Size(size), + LoadAddress(reinterpret_cast<uintptr_t>(address)), StubOffset(size), + AllocationSize(allocationSize), ObjAddress(objAddress) { + // AllocationSize is used only in asserts, prevent an "unused private field" + // warning: + (void)AllocationSize; + } + + StringRef getName() const { return Name; } + + uint8_t *getAddress() const { return Address; } + + /// \brief Return the address of this section with an offset. + uint8_t *getAddressWithOffset(unsigned OffsetBytes) const { + assert(OffsetBytes <= AllocationSize && "Offset out of bounds!"); + return Address + OffsetBytes; + } + + size_t getSize() const { return Size; } + + uint64_t getLoadAddress() const { return LoadAddress; } + void setLoadAddress(uint64_t LA) { LoadAddress = LA; } + + /// \brief Return the load address of this section with an offset. + uint64_t getLoadAddressWithOffset(unsigned OffsetBytes) const { + assert(OffsetBytes <= AllocationSize && "Offset out of bounds!"); + return LoadAddress + OffsetBytes; + } + + uintptr_t getStubOffset() const { return StubOffset; } + + void advanceStubOffset(unsigned StubSize) { + StubOffset += StubSize; + assert(StubOffset <= AllocationSize && "Not enough space allocated!"); + } + + uintptr_t getObjAddress() const { return ObjAddress; } +}; + +/// RelocationEntry - used to represent relocations internally in the dynamic +/// linker. +class RelocationEntry { +public: + /// SectionID - the section this relocation points to. + unsigned SectionID; + + /// Offset - offset into the section. + uint64_t Offset; + + /// RelType - relocation type. + uint32_t RelType; + + /// Addend - the relocation addend encoded in the instruction itself. Also + /// used to make a relocation section relative instead of symbol relative. + int64_t Addend; + + struct SectionPair { + uint32_t SectionA; + uint32_t SectionB; + }; + + /// SymOffset - Section offset of the relocation entry's symbol (used for GOT + /// lookup). + union { + uint64_t SymOffset; + SectionPair Sections; + }; + + /// True if this is a PCRel relocation (MachO specific). + bool IsPCRel; + + /// The size of this relocation (MachO specific). + unsigned Size; + + RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend) + : SectionID(id), Offset(offset), RelType(type), Addend(addend), + SymOffset(0), IsPCRel(false), Size(0) {} + + RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend, + uint64_t symoffset) + : SectionID(id), Offset(offset), RelType(type), Addend(addend), + SymOffset(symoffset), IsPCRel(false), Size(0) {} + + RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend, + bool IsPCRel, unsigned Size) + : SectionID(id), Offset(offset), RelType(type), Addend(addend), + SymOffset(0), IsPCRel(IsPCRel), Size(Size) {} + + RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend, + unsigned SectionA, uint64_t SectionAOffset, unsigned SectionB, + uint64_t SectionBOffset, bool IsPCRel, unsigned Size) + : SectionID(id), Offset(offset), RelType(type), + Addend(SectionAOffset - SectionBOffset + addend), IsPCRel(IsPCRel), + Size(Size) { + Sections.SectionA = SectionA; + Sections.SectionB = SectionB; + } +}; + +class RelocationValueRef { +public: + unsigned SectionID; + uint64_t Offset; + int64_t Addend; + const char *SymbolName; + RelocationValueRef() : SectionID(0), Offset(0), Addend(0), + SymbolName(nullptr) {} + + inline bool operator==(const RelocationValueRef &Other) const { + return SectionID == Other.SectionID && Offset == Other.Offset && + Addend == Other.Addend && SymbolName == Other.SymbolName; + } + inline bool operator<(const RelocationValueRef &Other) const { + if (SectionID != Other.SectionID) + return SectionID < Other.SectionID; + if (Offset != Other.Offset) + return Offset < Other.Offset; + if (Addend != Other.Addend) + return Addend < Other.Addend; + return SymbolName < Other.SymbolName; + } +}; + +/// @brief Symbol info for RuntimeDyld. +class SymbolTableEntry : public JITSymbolBase { +public: + SymbolTableEntry() + : JITSymbolBase(JITSymbolFlags::None), Offset(0), SectionID(0) {} + + SymbolTableEntry(unsigned SectionID, uint64_t Offset, JITSymbolFlags Flags) + : JITSymbolBase(Flags), Offset(Offset), SectionID(SectionID) {} + + unsigned getSectionID() const { return SectionID; } + uint64_t getOffset() const { return Offset; } + +private: + uint64_t Offset; + unsigned SectionID; +}; + +typedef StringMap<SymbolTableEntry> RTDyldSymbolTable; + +class RuntimeDyldImpl { + friend class RuntimeDyld::LoadedObjectInfo; + friend class RuntimeDyldCheckerImpl; +protected: + static const unsigned AbsoluteSymbolSection = ~0U; + + // The MemoryManager to load objects into. + RuntimeDyld::MemoryManager &MemMgr; + + // The symbol resolver to use for external symbols. + RuntimeDyld::SymbolResolver &Resolver; + + // Attached RuntimeDyldChecker instance. Null if no instance attached. + RuntimeDyldCheckerImpl *Checker; + + // A list of all sections emitted by the dynamic linker. These sections are + // referenced in the code by means of their index in this list - SectionID. + typedef SmallVector<SectionEntry, 64> SectionList; + SectionList Sections; + + typedef unsigned SID; // Type for SectionIDs +#define RTDYLD_INVALID_SECTION_ID ((RuntimeDyldImpl::SID)(-1)) + + // Keep a map of sections from object file to the SectionID which + // references it. + typedef std::map<SectionRef, unsigned> ObjSectionToIDMap; + + // A global symbol table for symbols from all loaded modules. + RTDyldSymbolTable GlobalSymbolTable; + + // Keep a map of common symbols to their info pairs + typedef std::vector<SymbolRef> CommonSymbolList; + + // For each symbol, keep a list of relocations based on it. Anytime + // its address is reassigned (the JIT re-compiled the function, e.g.), + // the relocations get re-resolved. + // The symbol (or section) the relocation is sourced from is the Key + // in the relocation list where it's stored. + typedef SmallVector<RelocationEntry, 64> RelocationList; + // Relocations to sections already loaded. Indexed by SectionID which is the + // source of the address. The target where the address will be written is + // SectionID/Offset in the relocation itself. + std::unordered_map<unsigned, RelocationList> Relocations; + + // Relocations to external symbols that are not yet resolved. Symbols are + // external when they aren't found in the global symbol table of all loaded + // modules. This map is indexed by symbol name. + StringMap<RelocationList> ExternalSymbolRelocations; + + + typedef std::map<RelocationValueRef, uintptr_t> StubMap; + + Triple::ArchType Arch; + bool IsTargetLittleEndian; + bool IsMipsO32ABI; + bool IsMipsN64ABI; + + // True if all sections should be passed to the memory manager, false if only + // sections containing relocations should be. Defaults to 'false'. + bool ProcessAllSections; + + // This mutex prevents simultaneously loading objects from two different + // threads. This keeps us from having to protect individual data structures + // and guarantees that section allocation requests to the memory manager + // won't be interleaved between modules. It is also used in mapSectionAddress + // and resolveRelocations to protect write access to internal data structures. + // + // loadObject may be called on the same thread during the handling of of + // processRelocations, and that's OK. The handling of the relocation lists + // is written in such a way as to work correctly if new elements are added to + // the end of the list while the list is being processed. + sys::Mutex lock; + + virtual unsigned getMaxStubSize() = 0; + virtual unsigned getStubAlignment() = 0; + + bool HasError; + std::string ErrorStr; + + // Set the error state and record an error string. + bool Error(const Twine &Msg) { + ErrorStr = Msg.str(); + HasError = true; + return true; + } + + uint64_t getSectionLoadAddress(unsigned SectionID) const { + return Sections[SectionID].getLoadAddress(); + } + + uint8_t *getSectionAddress(unsigned SectionID) const { + return Sections[SectionID].getAddress(); + } + + void writeInt16BE(uint8_t *Addr, uint16_t Value) { + if (IsTargetLittleEndian) + sys::swapByteOrder(Value); + *Addr = (Value >> 8) & 0xFF; + *(Addr + 1) = Value & 0xFF; + } + + void writeInt32BE(uint8_t *Addr, uint32_t Value) { + if (IsTargetLittleEndian) + sys::swapByteOrder(Value); + *Addr = (Value >> 24) & 0xFF; + *(Addr + 1) = (Value >> 16) & 0xFF; + *(Addr + 2) = (Value >> 8) & 0xFF; + *(Addr + 3) = Value & 0xFF; + } + + void writeInt64BE(uint8_t *Addr, uint64_t Value) { + if (IsTargetLittleEndian) + sys::swapByteOrder(Value); + *Addr = (Value >> 56) & 0xFF; + *(Addr + 1) = (Value >> 48) & 0xFF; + *(Addr + 2) = (Value >> 40) & 0xFF; + *(Addr + 3) = (Value >> 32) & 0xFF; + *(Addr + 4) = (Value >> 24) & 0xFF; + *(Addr + 5) = (Value >> 16) & 0xFF; + *(Addr + 6) = (Value >> 8) & 0xFF; + *(Addr + 7) = Value & 0xFF; + } + + virtual void setMipsABI(const ObjectFile &Obj) { + IsMipsO32ABI = false; + IsMipsN64ABI = false; + } + + /// Endian-aware read Read the least significant Size bytes from Src. + uint64_t readBytesUnaligned(uint8_t *Src, unsigned Size) const; + + /// Endian-aware write. Write the least significant Size bytes from Value to + /// Dst. + void writeBytesUnaligned(uint64_t Value, uint8_t *Dst, unsigned Size) const; + + /// \brief Given the common symbols discovered in the object file, emit a + /// new section for them and update the symbol mappings in the object and + /// symbol table. + void emitCommonSymbols(const ObjectFile &Obj, CommonSymbolList &CommonSymbols); + + /// \brief Emits section data from the object file to the MemoryManager. + /// \param IsCode if it's true then allocateCodeSection() will be + /// used for emits, else allocateDataSection() will be used. + /// \return SectionID. + unsigned emitSection(const ObjectFile &Obj, const SectionRef &Section, + bool IsCode); + + /// \brief Find Section in LocalSections. If the secton is not found - emit + /// it and store in LocalSections. + /// \param IsCode if it's true then allocateCodeSection() will be + /// used for emmits, else allocateDataSection() will be used. + /// \return SectionID. + unsigned findOrEmitSection(const ObjectFile &Obj, const SectionRef &Section, + bool IsCode, ObjSectionToIDMap &LocalSections); + + // \brief Add a relocation entry that uses the given section. + void addRelocationForSection(const RelocationEntry &RE, unsigned SectionID); + + // \brief Add a relocation entry that uses the given symbol. This symbol may + // be found in the global symbol table, or it may be external. + void addRelocationForSymbol(const RelocationEntry &RE, StringRef SymbolName); + + /// \brief Emits long jump instruction to Addr. + /// \return Pointer to the memory area for emitting target address. + uint8_t *createStubFunction(uint8_t *Addr, unsigned AbiVariant = 0); + + /// \brief Resolves relocations from Relocs list with address from Value. + void resolveRelocationList(const RelocationList &Relocs, uint64_t Value); + + /// \brief A object file specific relocation resolver + /// \param RE The relocation to be resolved + /// \param Value Target symbol address to apply the relocation action + virtual void resolveRelocation(const RelocationEntry &RE, uint64_t Value) = 0; + + /// \brief Parses one or more object file relocations (some object files use + /// relocation pairs) and stores it to Relocations or SymbolRelocations + /// (this depends on the object file type). + /// \return Iterator to the next relocation that needs to be parsed. + virtual relocation_iterator + processRelocationRef(unsigned SectionID, relocation_iterator RelI, + const ObjectFile &Obj, ObjSectionToIDMap &ObjSectionToID, + StubMap &Stubs) = 0; + + /// \brief Resolve relocations to external symbols. + void resolveExternalSymbols(); + + // \brief Compute an upper bound of the memory that is required to load all + // sections + void computeTotalAllocSize(const ObjectFile &Obj, uint64_t &CodeSize, + uint64_t &DataSizeRO, uint64_t &DataSizeRW); + + // \brief Compute the stub buffer size required for a section + unsigned computeSectionStubBufSize(const ObjectFile &Obj, + const SectionRef &Section); + + // \brief Implementation of the generic part of the loadObject algorithm. + ObjSectionToIDMap loadObjectImpl(const object::ObjectFile &Obj); + + // \brief Return true if the relocation R may require allocating a stub. + virtual bool relocationNeedsStub(const RelocationRef &R) const { + return true; // Conservative answer + } + +public: + RuntimeDyldImpl(RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver) + : MemMgr(MemMgr), Resolver(Resolver), Checker(nullptr), + ProcessAllSections(false), HasError(false) { + } + + virtual ~RuntimeDyldImpl(); + + void setProcessAllSections(bool ProcessAllSections) { + this->ProcessAllSections = ProcessAllSections; + } + + void setRuntimeDyldChecker(RuntimeDyldCheckerImpl *Checker) { + this->Checker = Checker; + } + + virtual std::unique_ptr<RuntimeDyld::LoadedObjectInfo> + loadObject(const object::ObjectFile &Obj) = 0; + + uint8_t* getSymbolLocalAddress(StringRef Name) const { + // FIXME: Just look up as a function for now. Overly simple of course. + // Work in progress. + RTDyldSymbolTable::const_iterator pos = GlobalSymbolTable.find(Name); + if (pos == GlobalSymbolTable.end()) + return nullptr; + const auto &SymInfo = pos->second; + // Absolute symbols do not have a local address. + if (SymInfo.getSectionID() == AbsoluteSymbolSection) + return nullptr; + return getSectionAddress(SymInfo.getSectionID()) + SymInfo.getOffset(); + } + + RuntimeDyld::SymbolInfo getSymbol(StringRef Name) const { + // FIXME: Just look up as a function for now. Overly simple of course. + // Work in progress. + RTDyldSymbolTable::const_iterator pos = GlobalSymbolTable.find(Name); + if (pos == GlobalSymbolTable.end()) + return nullptr; + const auto &SymEntry = pos->second; + uint64_t SectionAddr = 0; + if (SymEntry.getSectionID() != AbsoluteSymbolSection) + SectionAddr = getSectionLoadAddress(SymEntry.getSectionID()); + uint64_t TargetAddr = SectionAddr + SymEntry.getOffset(); + return RuntimeDyld::SymbolInfo(TargetAddr, SymEntry.getFlags()); + } + + void resolveRelocations(); + + void reassignSectionAddress(unsigned SectionID, uint64_t Addr); + + void mapSectionAddress(const void *LocalAddress, uint64_t TargetAddress); + + // Is the linker in an error state? + bool hasError() { return HasError; } + + // Mark the error condition as handled and continue. + void clearError() { HasError = false; } + + // Get the error message. + StringRef getErrorString() { return ErrorStr; } + + virtual bool isCompatibleFile(const ObjectFile &Obj) const = 0; + + virtual void registerEHFrames(); + + virtual void deregisterEHFrames(); + + virtual void finalizeLoad(const ObjectFile &ObjImg, + ObjSectionToIDMap &SectionMap) {} +}; + +} // end namespace llvm + +#endif diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp new file mode 100644 index 0000000..739e8d6 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp @@ -0,0 +1,339 @@ +//===-- RuntimeDyldMachO.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-=// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// Implementation of the MC-JIT runtime dynamic linker. +// +//===----------------------------------------------------------------------===// + +#include "RuntimeDyldMachO.h" +#include "Targets/RuntimeDyldMachOAArch64.h" +#include "Targets/RuntimeDyldMachOARM.h" +#include "Targets/RuntimeDyldMachOI386.h" +#include "Targets/RuntimeDyldMachOX86_64.h" +#include "llvm/ADT/STLExtras.h" +#include "llvm/ADT/StringRef.h" + +using namespace llvm; +using namespace llvm::object; + +#define DEBUG_TYPE "dyld" + +namespace { + +class LoadedMachOObjectInfo final + : public RuntimeDyld::LoadedObjectInfoHelper<LoadedMachOObjectInfo> { +public: + LoadedMachOObjectInfo(RuntimeDyldImpl &RTDyld, + ObjSectionToIDMap ObjSecToIDMap) + : LoadedObjectInfoHelper(RTDyld, std::move(ObjSecToIDMap)) {} + + OwningBinary<ObjectFile> + getObjectForDebug(const ObjectFile &Obj) const override { + return OwningBinary<ObjectFile>(); + } +}; + +} + +namespace llvm { + +int64_t RuntimeDyldMachO::memcpyAddend(const RelocationEntry &RE) const { + unsigned NumBytes = 1 << RE.Size; + uint8_t *Src = Sections[RE.SectionID].getAddress() + RE.Offset; + + return static_cast<int64_t>(readBytesUnaligned(Src, NumBytes)); +} + +relocation_iterator RuntimeDyldMachO::processScatteredVANILLA( + unsigned SectionID, relocation_iterator RelI, + const ObjectFile &BaseObjT, + RuntimeDyldMachO::ObjSectionToIDMap &ObjSectionToID) { + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile&>(BaseObjT); + MachO::any_relocation_info RE = + Obj.getRelocation(RelI->getRawDataRefImpl()); + + SectionEntry &Section = Sections[SectionID]; + uint32_t RelocType = Obj.getAnyRelocationType(RE); + bool IsPCRel = Obj.getAnyRelocationPCRel(RE); + unsigned Size = Obj.getAnyRelocationLength(RE); + uint64_t Offset = RelI->getOffset(); + uint8_t *LocalAddress = Section.getAddressWithOffset(Offset); + unsigned NumBytes = 1 << Size; + int64_t Addend = readBytesUnaligned(LocalAddress, NumBytes); + + unsigned SymbolBaseAddr = Obj.getScatteredRelocationValue(RE); + section_iterator TargetSI = getSectionByAddress(Obj, SymbolBaseAddr); + assert(TargetSI != Obj.section_end() && "Can't find section for symbol"); + uint64_t SectionBaseAddr = TargetSI->getAddress(); + SectionRef TargetSection = *TargetSI; + bool IsCode = TargetSection.isText(); + uint32_t TargetSectionID = + findOrEmitSection(Obj, TargetSection, IsCode, ObjSectionToID); + + Addend -= SectionBaseAddr; + RelocationEntry R(SectionID, Offset, RelocType, Addend, IsPCRel, Size); + + addRelocationForSection(R, TargetSectionID); + + return ++RelI; +} + + +RelocationValueRef RuntimeDyldMachO::getRelocationValueRef( + const ObjectFile &BaseTObj, const relocation_iterator &RI, + const RelocationEntry &RE, ObjSectionToIDMap &ObjSectionToID) { + + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile &>(BaseTObj); + MachO::any_relocation_info RelInfo = + Obj.getRelocation(RI->getRawDataRefImpl()); + RelocationValueRef Value; + + bool IsExternal = Obj.getPlainRelocationExternal(RelInfo); + if (IsExternal) { + symbol_iterator Symbol = RI->getSymbol(); + ErrorOr<StringRef> TargetNameOrErr = Symbol->getName(); + if (std::error_code EC = TargetNameOrErr.getError()) + report_fatal_error(EC.message()); + StringRef TargetName = *TargetNameOrErr; + RTDyldSymbolTable::const_iterator SI = + GlobalSymbolTable.find(TargetName.data()); + if (SI != GlobalSymbolTable.end()) { + const auto &SymInfo = SI->second; + Value.SectionID = SymInfo.getSectionID(); + Value.Offset = SymInfo.getOffset() + RE.Addend; + } else { + Value.SymbolName = TargetName.data(); + Value.Offset = RE.Addend; + } + } else { + SectionRef Sec = Obj.getAnyRelocationSection(RelInfo); + bool IsCode = Sec.isText(); + Value.SectionID = findOrEmitSection(Obj, Sec, IsCode, ObjSectionToID); + uint64_t Addr = Sec.getAddress(); + Value.Offset = RE.Addend - Addr; + } + + return Value; +} + +void RuntimeDyldMachO::makeValueAddendPCRel(RelocationValueRef &Value, + const relocation_iterator &RI, + unsigned OffsetToNextPC) { + auto &O = *cast<MachOObjectFile>(RI->getObject()); + section_iterator SecI = O.getRelocationRelocatedSection(RI); + Value.Offset += RI->getOffset() + OffsetToNextPC + SecI->getAddress(); +} + +void RuntimeDyldMachO::dumpRelocationToResolve(const RelocationEntry &RE, + uint64_t Value) const { + const SectionEntry &Section = Sections[RE.SectionID]; + uint8_t *LocalAddress = Section.getAddress() + RE.Offset; + uint64_t FinalAddress = Section.getLoadAddress() + RE.Offset; + + dbgs() << "resolveRelocation Section: " << RE.SectionID + << " LocalAddress: " << format("%p", LocalAddress) + << " FinalAddress: " << format("0x%016" PRIx64, FinalAddress) + << " Value: " << format("0x%016" PRIx64, Value) << " Addend: " << RE.Addend + << " isPCRel: " << RE.IsPCRel << " MachoType: " << RE.RelType + << " Size: " << (1 << RE.Size) << "\n"; +} + +section_iterator +RuntimeDyldMachO::getSectionByAddress(const MachOObjectFile &Obj, + uint64_t Addr) { + section_iterator SI = Obj.section_begin(); + section_iterator SE = Obj.section_end(); + + for (; SI != SE; ++SI) { + uint64_t SAddr = SI->getAddress(); + uint64_t SSize = SI->getSize(); + if ((Addr >= SAddr) && (Addr < SAddr + SSize)) + return SI; + } + + return SE; +} + + +// Populate __pointers section. +void RuntimeDyldMachO::populateIndirectSymbolPointersSection( + const MachOObjectFile &Obj, + const SectionRef &PTSection, + unsigned PTSectionID) { + assert(!Obj.is64Bit() && + "Pointer table section not supported in 64-bit MachO."); + + MachO::dysymtab_command DySymTabCmd = Obj.getDysymtabLoadCommand(); + MachO::section Sec32 = Obj.getSection(PTSection.getRawDataRefImpl()); + uint32_t PTSectionSize = Sec32.size; + unsigned FirstIndirectSymbol = Sec32.reserved1; + const unsigned PTEntrySize = 4; + unsigned NumPTEntries = PTSectionSize / PTEntrySize; + unsigned PTEntryOffset = 0; + + assert((PTSectionSize % PTEntrySize) == 0 && + "Pointers section does not contain a whole number of stubs?"); + + DEBUG(dbgs() << "Populating pointer table section " + << Sections[PTSectionID].getName() << ", Section ID " + << PTSectionID << ", " << NumPTEntries << " entries, " + << PTEntrySize << " bytes each:\n"); + + for (unsigned i = 0; i < NumPTEntries; ++i) { + unsigned SymbolIndex = + Obj.getIndirectSymbolTableEntry(DySymTabCmd, FirstIndirectSymbol + i); + symbol_iterator SI = Obj.getSymbolByIndex(SymbolIndex); + ErrorOr<StringRef> IndirectSymbolNameOrErr = SI->getName(); + if (std::error_code EC = IndirectSymbolNameOrErr.getError()) + report_fatal_error(EC.message()); + StringRef IndirectSymbolName = *IndirectSymbolNameOrErr; + DEBUG(dbgs() << " " << IndirectSymbolName << ": index " << SymbolIndex + << ", PT offset: " << PTEntryOffset << "\n"); + RelocationEntry RE(PTSectionID, PTEntryOffset, + MachO::GENERIC_RELOC_VANILLA, 0, false, 2); + addRelocationForSymbol(RE, IndirectSymbolName); + PTEntryOffset += PTEntrySize; + } +} + +bool RuntimeDyldMachO::isCompatibleFile(const object::ObjectFile &Obj) const { + return Obj.isMachO(); +} + +template <typename Impl> +void RuntimeDyldMachOCRTPBase<Impl>::finalizeLoad(const ObjectFile &Obj, + ObjSectionToIDMap &SectionMap) { + unsigned EHFrameSID = RTDYLD_INVALID_SECTION_ID; + unsigned TextSID = RTDYLD_INVALID_SECTION_ID; + unsigned ExceptTabSID = RTDYLD_INVALID_SECTION_ID; + + for (const auto &Section : Obj.sections()) { + StringRef Name; + Section.getName(Name); + + // Force emission of the __text, __eh_frame, and __gcc_except_tab sections + // if they're present. Otherwise call down to the impl to handle other + // sections that have already been emitted. + if (Name == "__text") + TextSID = findOrEmitSection(Obj, Section, true, SectionMap); + else if (Name == "__eh_frame") + EHFrameSID = findOrEmitSection(Obj, Section, false, SectionMap); + else if (Name == "__gcc_except_tab") + ExceptTabSID = findOrEmitSection(Obj, Section, true, SectionMap); + else { + auto I = SectionMap.find(Section); + if (I != SectionMap.end()) + impl().finalizeSection(Obj, I->second, Section); + } + } + UnregisteredEHFrameSections.push_back( + EHFrameRelatedSections(EHFrameSID, TextSID, ExceptTabSID)); +} + +template <typename Impl> +unsigned char *RuntimeDyldMachOCRTPBase<Impl>::processFDE(uint8_t *P, + int64_t DeltaForText, + int64_t DeltaForEH) { + typedef typename Impl::TargetPtrT TargetPtrT; + + DEBUG(dbgs() << "Processing FDE: Delta for text: " << DeltaForText + << ", Delta for EH: " << DeltaForEH << "\n"); + uint32_t Length = readBytesUnaligned(P, 4); + P += 4; + uint8_t *Ret = P + Length; + uint32_t Offset = readBytesUnaligned(P, 4); + if (Offset == 0) // is a CIE + return Ret; + + P += 4; + TargetPtrT FDELocation = readBytesUnaligned(P, sizeof(TargetPtrT)); + TargetPtrT NewLocation = FDELocation - DeltaForText; + writeBytesUnaligned(NewLocation, P, sizeof(TargetPtrT)); + + P += sizeof(TargetPtrT); + + // Skip the FDE address range + P += sizeof(TargetPtrT); + + uint8_t Augmentationsize = *P; + P += 1; + if (Augmentationsize != 0) { + TargetPtrT LSDA = readBytesUnaligned(P, sizeof(TargetPtrT)); + TargetPtrT NewLSDA = LSDA - DeltaForEH; + writeBytesUnaligned(NewLSDA, P, sizeof(TargetPtrT)); + } + + return Ret; +} + +static int64_t computeDelta(SectionEntry *A, SectionEntry *B) { + int64_t ObjDistance = static_cast<int64_t>(A->getObjAddress()) - + static_cast<int64_t>(B->getObjAddress()); + int64_t MemDistance = A->getLoadAddress() - B->getLoadAddress(); + return ObjDistance - MemDistance; +} + +template <typename Impl> +void RuntimeDyldMachOCRTPBase<Impl>::registerEHFrames() { + + for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) { + EHFrameRelatedSections &SectionInfo = UnregisteredEHFrameSections[i]; + if (SectionInfo.EHFrameSID == RTDYLD_INVALID_SECTION_ID || + SectionInfo.TextSID == RTDYLD_INVALID_SECTION_ID) + continue; + SectionEntry *Text = &Sections[SectionInfo.TextSID]; + SectionEntry *EHFrame = &Sections[SectionInfo.EHFrameSID]; + SectionEntry *ExceptTab = nullptr; + if (SectionInfo.ExceptTabSID != RTDYLD_INVALID_SECTION_ID) + ExceptTab = &Sections[SectionInfo.ExceptTabSID]; + + int64_t DeltaForText = computeDelta(Text, EHFrame); + int64_t DeltaForEH = 0; + if (ExceptTab) + DeltaForEH = computeDelta(ExceptTab, EHFrame); + + uint8_t *P = EHFrame->getAddress(); + uint8_t *End = P + EHFrame->getSize(); + do { + P = processFDE(P, DeltaForText, DeltaForEH); + } while (P != End); + + MemMgr.registerEHFrames(EHFrame->getAddress(), EHFrame->getLoadAddress(), + EHFrame->getSize()); + } + UnregisteredEHFrameSections.clear(); +} + +std::unique_ptr<RuntimeDyldMachO> +RuntimeDyldMachO::create(Triple::ArchType Arch, + RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver) { + switch (Arch) { + default: + llvm_unreachable("Unsupported target for RuntimeDyldMachO."); + break; + case Triple::arm: + return make_unique<RuntimeDyldMachOARM>(MemMgr, Resolver); + case Triple::aarch64: + return make_unique<RuntimeDyldMachOAArch64>(MemMgr, Resolver); + case Triple::x86: + return make_unique<RuntimeDyldMachOI386>(MemMgr, Resolver); + case Triple::x86_64: + return make_unique<RuntimeDyldMachOX86_64>(MemMgr, Resolver); + } +} + +std::unique_ptr<RuntimeDyld::LoadedObjectInfo> +RuntimeDyldMachO::loadObject(const object::ObjectFile &O) { + return llvm::make_unique<LoadedMachOObjectInfo>(*this, loadObjectImpl(O)); +} + +} // end namespace llvm diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h new file mode 100644 index 0000000..c8ae47b --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h @@ -0,0 +1,166 @@ +//===-- RuntimeDyldMachO.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-=// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// MachO support for MC-JIT runtime dynamic linker. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDMACHO_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDMACHO_H + +#include "RuntimeDyldImpl.h" +#include "llvm/Object/MachO.h" +#include "llvm/Support/Format.h" + +#define DEBUG_TYPE "dyld" + +using namespace llvm; +using namespace llvm::object; + +namespace llvm { +class RuntimeDyldMachO : public RuntimeDyldImpl { +protected: + struct SectionOffsetPair { + unsigned SectionID; + uint64_t Offset; + }; + + struct EHFrameRelatedSections { + EHFrameRelatedSections() + : EHFrameSID(RTDYLD_INVALID_SECTION_ID), + TextSID(RTDYLD_INVALID_SECTION_ID), + ExceptTabSID(RTDYLD_INVALID_SECTION_ID) {} + + EHFrameRelatedSections(SID EH, SID T, SID Ex) + : EHFrameSID(EH), TextSID(T), ExceptTabSID(Ex) {} + SID EHFrameSID; + SID TextSID; + SID ExceptTabSID; + }; + + // When a module is loaded we save the SectionID of the EH frame section + // in a table until we receive a request to register all unregistered + // EH frame sections with the memory manager. + SmallVector<EHFrameRelatedSections, 2> UnregisteredEHFrameSections; + + RuntimeDyldMachO(RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldImpl(MemMgr, Resolver) {} + + /// This convenience method uses memcpy to extract a contiguous addend (the + /// addend size and offset are taken from the corresponding fields of the RE). + int64_t memcpyAddend(const RelocationEntry &RE) const; + + /// Given a relocation_iterator for a non-scattered relocation, construct a + /// RelocationEntry and fill in the common fields. The 'Addend' field is *not* + /// filled in, since immediate encodings are highly target/opcode specific. + /// For targets/opcodes with simple, contiguous immediates (e.g. X86) the + /// memcpyAddend method can be used to read the immediate. + RelocationEntry getRelocationEntry(unsigned SectionID, + const ObjectFile &BaseTObj, + const relocation_iterator &RI) const { + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile &>(BaseTObj); + MachO::any_relocation_info RelInfo = + Obj.getRelocation(RI->getRawDataRefImpl()); + + bool IsPCRel = Obj.getAnyRelocationPCRel(RelInfo); + unsigned Size = Obj.getAnyRelocationLength(RelInfo); + uint64_t Offset = RI->getOffset(); + MachO::RelocationInfoType RelType = + static_cast<MachO::RelocationInfoType>(Obj.getAnyRelocationType(RelInfo)); + + return RelocationEntry(SectionID, Offset, RelType, 0, IsPCRel, Size); + } + + /// Process a scattered vanilla relocation. + relocation_iterator processScatteredVANILLA( + unsigned SectionID, relocation_iterator RelI, + const ObjectFile &BaseObjT, + RuntimeDyldMachO::ObjSectionToIDMap &ObjSectionToID); + + /// Construct a RelocationValueRef representing the relocation target. + /// For Symbols in known sections, this will return a RelocationValueRef + /// representing a (SectionID, Offset) pair. + /// For Symbols whose section is not known, this will return a + /// (SymbolName, Offset) pair, where the Offset is taken from the instruction + /// immediate (held in RE.Addend). + /// In both cases the Addend field is *NOT* fixed up to be PC-relative. That + /// should be done by the caller where appropriate by calling makePCRel on + /// the RelocationValueRef. + RelocationValueRef getRelocationValueRef(const ObjectFile &BaseTObj, + const relocation_iterator &RI, + const RelocationEntry &RE, + ObjSectionToIDMap &ObjSectionToID); + + /// Make the RelocationValueRef addend PC-relative. + void makeValueAddendPCRel(RelocationValueRef &Value, + const relocation_iterator &RI, + unsigned OffsetToNextPC); + + /// Dump information about the relocation entry (RE) and resolved value. + void dumpRelocationToResolve(const RelocationEntry &RE, uint64_t Value) const; + + // Return a section iterator for the section containing the given address. + static section_iterator getSectionByAddress(const MachOObjectFile &Obj, + uint64_t Addr); + + + // Populate __pointers section. + void populateIndirectSymbolPointersSection(const MachOObjectFile &Obj, + const SectionRef &PTSection, + unsigned PTSectionID); + +public: + + /// Create a RuntimeDyldMachO instance for the given target architecture. + static std::unique_ptr<RuntimeDyldMachO> + create(Triple::ArchType Arch, + RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver); + + std::unique_ptr<RuntimeDyld::LoadedObjectInfo> + loadObject(const object::ObjectFile &O) override; + + SectionEntry &getSection(unsigned SectionID) { return Sections[SectionID]; } + + bool isCompatibleFile(const object::ObjectFile &Obj) const override; +}; + +/// RuntimeDyldMachOTarget - Templated base class for generic MachO linker +/// algorithms and data structures. +/// +/// Concrete, target specific sub-classes can be accessed via the impl() +/// methods. (i.e. the RuntimeDyldMachO hierarchy uses the Curiously +/// Recurring Template Idiom). Concrete subclasses for each target +/// can be found in ./Targets. +template <typename Impl> +class RuntimeDyldMachOCRTPBase : public RuntimeDyldMachO { +private: + Impl &impl() { return static_cast<Impl &>(*this); } + const Impl &impl() const { return static_cast<const Impl &>(*this); } + + unsigned char *processFDE(uint8_t *P, int64_t DeltaForText, + int64_t DeltaForEH); + +public: + RuntimeDyldMachOCRTPBase(RuntimeDyld::MemoryManager &MemMgr, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldMachO(MemMgr, Resolver) {} + + void finalizeLoad(const ObjectFile &Obj, + ObjSectionToIDMap &SectionMap) override; + void registerEHFrames() override; +}; + +} // end namespace llvm + +#undef DEBUG_TYPE + +#endif diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFI386.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFI386.h new file mode 100644 index 0000000..fbfbb32 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFI386.h @@ -0,0 +1,201 @@ +//===--- RuntimeDyldCOFFI386.h --- COFF/X86_64 specific code ---*- C++ --*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// COFF x86 support for MC-JIT runtime dynamic linker. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDCOFFI386_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDCOFFI386_H + +#include "llvm/Object/COFF.h" +#include "llvm/Support/COFF.h" +#include "../RuntimeDyldCOFF.h" + +#define DEBUG_TYPE "dyld" + +namespace llvm { + +class RuntimeDyldCOFFI386 : public RuntimeDyldCOFF { +public: + RuntimeDyldCOFFI386(RuntimeDyld::MemoryManager &MM, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldCOFF(MM, Resolver) {} + + unsigned getMaxStubSize() override { + return 8; // 2-byte jmp instruction + 32-bit relative address + 2 byte pad + } + + unsigned getStubAlignment() override { return 1; } + + relocation_iterator processRelocationRef(unsigned SectionID, + relocation_iterator RelI, + const ObjectFile &Obj, + ObjSectionToIDMap &ObjSectionToID, + StubMap &Stubs) override { + auto Symbol = RelI->getSymbol(); + if (Symbol == Obj.symbol_end()) + report_fatal_error("Unknown symbol in relocation"); + + ErrorOr<StringRef> TargetNameOrErr = Symbol->getName(); + if (auto EC = TargetNameOrErr.getError()) + report_fatal_error(EC.message()); + StringRef TargetName = *TargetNameOrErr; + + auto Section = *Symbol->getSection(); + + uint64_t RelType = RelI->getType(); + uint64_t Offset = RelI->getOffset(); + +#if !defined(NDEBUG) + SmallString<32> RelTypeName; + RelI->getTypeName(RelTypeName); +#endif + DEBUG(dbgs() << "\t\tIn Section " << SectionID << " Offset " << Offset + << " RelType: " << RelTypeName << " TargetName: " << TargetName + << "\n"); + + unsigned TargetSectionID = -1; + if (Section == Obj.section_end()) { + RelocationEntry RE(SectionID, Offset, RelType, 0, -1, 0, 0, 0, false, 0); + addRelocationForSymbol(RE, TargetName); + } else { + TargetSectionID = + findOrEmitSection(Obj, *Section, Section->isText(), ObjSectionToID); + + switch (RelType) { + case COFF::IMAGE_REL_I386_ABSOLUTE: + // This relocation is ignored. + break; + case COFF::IMAGE_REL_I386_DIR32: + case COFF::IMAGE_REL_I386_DIR32NB: + case COFF::IMAGE_REL_I386_REL32: { + RelocationEntry RE = + RelocationEntry(SectionID, Offset, RelType, 0, TargetSectionID, + getSymbolOffset(*Symbol), 0, 0, false, 0); + addRelocationForSection(RE, TargetSectionID); + break; + } + case COFF::IMAGE_REL_I386_SECTION: { + RelocationEntry RE = + RelocationEntry(TargetSectionID, Offset, RelType, 0); + addRelocationForSection(RE, TargetSectionID); + break; + } + case COFF::IMAGE_REL_I386_SECREL: { + RelocationEntry RE = RelocationEntry(SectionID, Offset, RelType, + getSymbolOffset(*Symbol)); + addRelocationForSection(RE, TargetSectionID); + break; + } + default: + llvm_unreachable("unsupported relocation type"); + } + + } + + return ++RelI; + } + + void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override { + const auto Section = Sections[RE.SectionID]; + uint8_t *Target = Section.getAddressWithOffset(RE.Offset); + + switch (RE.RelType) { + case COFF::IMAGE_REL_I386_ABSOLUTE: + // This relocation is ignored. + break; + case COFF::IMAGE_REL_I386_DIR32: { + // The target's 32-bit VA. + uint64_t Result = + RE.Sections.SectionA == static_cast<uint32_t>(-1) + ? Value + : Sections[RE.Sections.SectionA].getLoadAddressWithOffset( + RE.Addend); + assert(static_cast<int32_t>(Result) <= INT32_MAX && + "relocation overflow"); + assert(static_cast<int32_t>(Result) >= INT32_MIN && + "relocation underflow"); + DEBUG(dbgs() << "\t\tOffset: " << RE.Offset + << " RelType: IMAGE_REL_I386_DIR32" + << " TargetSection: " << RE.Sections.SectionA + << " Value: " << format("0x%08" PRIx32, Result) << '\n'); + writeBytesUnaligned(Result, Target, 4); + break; + } + case COFF::IMAGE_REL_I386_DIR32NB: { + // The target's 32-bit RVA. + // NOTE: use Section[0].getLoadAddress() as an approximation of ImageBase + uint64_t Result = + Sections[RE.Sections.SectionA].getLoadAddressWithOffset(RE.Addend) - + Sections[0].getLoadAddress(); + assert(static_cast<int32_t>(Result) <= INT32_MAX && + "relocation overflow"); + assert(static_cast<int32_t>(Result) >= INT32_MIN && + "relocation underflow"); + DEBUG(dbgs() << "\t\tOffset: " << RE.Offset + << " RelType: IMAGE_REL_I386_DIR32NB" + << " TargetSection: " << RE.Sections.SectionA + << " Value: " << format("0x%08" PRIx32, Result) << '\n'); + writeBytesUnaligned(Result, Target, 4); + break; + } + case COFF::IMAGE_REL_I386_REL32: { + // 32-bit relative displacement to the target. + uint64_t Result = Sections[RE.Sections.SectionA].getLoadAddress() - + Section.getLoadAddress() + RE.Addend - 4 - RE.Offset; + assert(static_cast<int32_t>(Result) <= INT32_MAX && + "relocation overflow"); + assert(static_cast<int32_t>(Result) >= INT32_MIN && + "relocation underflow"); + DEBUG(dbgs() << "\t\tOffset: " << RE.Offset + << " RelType: IMAGE_REL_I386_REL32" + << " TargetSection: " << RE.Sections.SectionA + << " Value: " << format("0x%08" PRIx32, Result) << '\n'); + writeBytesUnaligned(Result, Target, 4); + break; + } + case COFF::IMAGE_REL_I386_SECTION: + // 16-bit section index of the section that contains the target. + assert(static_cast<int32_t>(RE.SectionID) <= INT16_MAX && + "relocation overflow"); + assert(static_cast<int32_t>(RE.SectionID) >= INT16_MIN && + "relocation underflow"); + DEBUG(dbgs() << "\t\tOffset: " << RE.Offset + << " RelType: IMAGE_REL_I386_SECTION Value: " << RE.SectionID + << '\n'); + writeBytesUnaligned(RE.SectionID, Target, 2); + break; + case COFF::IMAGE_REL_I386_SECREL: + // 32-bit offset of the target from the beginning of its section. + assert(static_cast<int32_t>(RE.Addend) <= INT32_MAX && + "relocation overflow"); + assert(static_cast<int32_t>(RE.Addend) >= INT32_MIN && + "relocation underflow"); + DEBUG(dbgs() << "\t\tOffset: " << RE.Offset + << " RelType: IMAGE_REL_I386_SECREL Value: " << RE.Addend + << '\n'); + writeBytesUnaligned(RE.Addend, Target, 2); + break; + default: + llvm_unreachable("unsupported relocation type"); + } + } + + void registerEHFrames() override {} + void deregisterEHFrames() override {} + + void finalizeLoad(const ObjectFile &Obj, + ObjSectionToIDMap &SectionMap) override {} +}; + +} + +#endif + diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFX86_64.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFX86_64.h new file mode 100644 index 0000000..25f538d --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFX86_64.h @@ -0,0 +1,212 @@ +//===-- RuntimeDyldCOFFX86_64.h --- COFF/X86_64 specific code ---*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// COFF x86_x64 support for MC-JIT runtime dynamic linker. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDCOFF86_64_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDCOFF86_64_H + +#include "llvm/Object/COFF.h" +#include "llvm/Support/COFF.h" +#include "../RuntimeDyldCOFF.h" + +#define DEBUG_TYPE "dyld" + +namespace llvm { + +class RuntimeDyldCOFFX86_64 : public RuntimeDyldCOFF { + +private: + // When a module is loaded we save the SectionID of the unwind + // sections in a table until we receive a request to register all + // unregisteredEH frame sections with the memory manager. + SmallVector<SID, 2> UnregisteredEHFrameSections; + SmallVector<SID, 2> RegisteredEHFrameSections; + +public: + RuntimeDyldCOFFX86_64(RuntimeDyld::MemoryManager &MM, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldCOFF(MM, Resolver) {} + + unsigned getMaxStubSize() override { + return 6; // 2-byte jmp instruction + 32-bit relative address + } + + // The target location for the relocation is described by RE.SectionID and + // RE.Offset. RE.SectionID can be used to find the SectionEntry. Each + // SectionEntry has three members describing its location. + // SectionEntry::Address is the address at which the section has been loaded + // into memory in the current (host) process. SectionEntry::LoadAddress is + // the address that the section will have in the target process. + // SectionEntry::ObjAddress is the address of the bits for this section in the + // original emitted object image (also in the current address space). + // + // Relocations will be applied as if the section were loaded at + // SectionEntry::LoadAddress, but they will be applied at an address based + // on SectionEntry::Address. SectionEntry::ObjAddress will be used to refer + // to Target memory contents if they are required for value calculations. + // + // The Value parameter here is the load address of the symbol for the + // relocation to be applied. For relocations which refer to symbols in the + // current object Value will be the LoadAddress of the section in which + // the symbol resides (RE.Addend provides additional information about the + // symbol location). For external symbols, Value will be the address of the + // symbol in the target address space. + void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override { + const SectionEntry &Section = Sections[RE.SectionID]; + uint8_t *Target = Section.getAddressWithOffset(RE.Offset); + + switch (RE.RelType) { + + case COFF::IMAGE_REL_AMD64_REL32: + case COFF::IMAGE_REL_AMD64_REL32_1: + case COFF::IMAGE_REL_AMD64_REL32_2: + case COFF::IMAGE_REL_AMD64_REL32_3: + case COFF::IMAGE_REL_AMD64_REL32_4: + case COFF::IMAGE_REL_AMD64_REL32_5: { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(RE.Offset); + // Delta is the distance from the start of the reloc to the end of the + // instruction with the reloc. + uint64_t Delta = 4 + (RE.RelType - COFF::IMAGE_REL_AMD64_REL32); + Value -= FinalAddress + Delta; + uint64_t Result = Value + RE.Addend; + assert(((int64_t)Result <= INT32_MAX) && "Relocation overflow"); + assert(((int64_t)Result >= INT32_MIN) && "Relocation underflow"); + writeBytesUnaligned(Result, Target, 4); + break; + } + + case COFF::IMAGE_REL_AMD64_ADDR32NB: { + // Note ADDR32NB requires a well-established notion of + // image base. This address must be less than or equal + // to every section's load address, and all sections must be + // within a 32 bit offset from the base. + // + // For now we just set these to zero. + writeBytesUnaligned(0, Target, 4); + break; + } + + case COFF::IMAGE_REL_AMD64_ADDR64: { + writeBytesUnaligned(Value + RE.Addend, Target, 8); + break; + } + + default: + llvm_unreachable("Relocation type not implemented yet!"); + break; + } + } + + relocation_iterator processRelocationRef(unsigned SectionID, + relocation_iterator RelI, + const ObjectFile &Obj, + ObjSectionToIDMap &ObjSectionToID, + StubMap &Stubs) override { + // If possible, find the symbol referred to in the relocation, + // and the section that contains it. + symbol_iterator Symbol = RelI->getSymbol(); + if (Symbol == Obj.symbol_end()) + report_fatal_error("Unknown symbol in relocation"); + section_iterator SecI = *Symbol->getSection(); + // If there is no section, this must be an external reference. + const bool IsExtern = SecI == Obj.section_end(); + + // Determine the Addend used to adjust the relocation value. + uint64_t RelType = RelI->getType(); + uint64_t Offset = RelI->getOffset(); + uint64_t Addend = 0; + SectionEntry &Section = Sections[SectionID]; + uintptr_t ObjTarget = Section.getObjAddress() + Offset; + + switch (RelType) { + + case COFF::IMAGE_REL_AMD64_REL32: + case COFF::IMAGE_REL_AMD64_REL32_1: + case COFF::IMAGE_REL_AMD64_REL32_2: + case COFF::IMAGE_REL_AMD64_REL32_3: + case COFF::IMAGE_REL_AMD64_REL32_4: + case COFF::IMAGE_REL_AMD64_REL32_5: + case COFF::IMAGE_REL_AMD64_ADDR32NB: { + uint8_t *Displacement = (uint8_t *)ObjTarget; + Addend = readBytesUnaligned(Displacement, 4); + break; + } + + case COFF::IMAGE_REL_AMD64_ADDR64: { + uint8_t *Displacement = (uint8_t *)ObjTarget; + Addend = readBytesUnaligned(Displacement, 8); + break; + } + + default: + break; + } + + ErrorOr<StringRef> TargetNameOrErr = Symbol->getName(); + if (std::error_code EC = TargetNameOrErr.getError()) + report_fatal_error(EC.message()); + StringRef TargetName = *TargetNameOrErr; + + DEBUG(dbgs() << "\t\tIn Section " << SectionID << " Offset " << Offset + << " RelType: " << RelType << " TargetName: " << TargetName + << " Addend " << Addend << "\n"); + + if (IsExtern) { + RelocationEntry RE(SectionID, Offset, RelType, Addend); + addRelocationForSymbol(RE, TargetName); + } else { + bool IsCode = SecI->isText(); + unsigned TargetSectionID = + findOrEmitSection(Obj, *SecI, IsCode, ObjSectionToID); + uint64_t TargetOffset = getSymbolOffset(*Symbol); + RelocationEntry RE(SectionID, Offset, RelType, TargetOffset + Addend); + addRelocationForSection(RE, TargetSectionID); + } + + return ++RelI; + } + + unsigned getStubAlignment() override { return 1; } + void registerEHFrames() override { + for (auto const &EHFrameSID : UnregisteredEHFrameSections) { + uint8_t *EHFrameAddr = Sections[EHFrameSID].getAddress(); + uint64_t EHFrameLoadAddr = Sections[EHFrameSID].getLoadAddress(); + size_t EHFrameSize = Sections[EHFrameSID].getSize(); + MemMgr.registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize); + RegisteredEHFrameSections.push_back(EHFrameSID); + } + UnregisteredEHFrameSections.clear(); + } + void deregisterEHFrames() override { + // Stub + } + void finalizeLoad(const ObjectFile &Obj, + ObjSectionToIDMap &SectionMap) override { + // Look for and record the EH frame section IDs. + for (const auto &SectionPair : SectionMap) { + const SectionRef &Section = SectionPair.first; + StringRef Name; + Check(Section.getName(Name)); + // Note unwind info is split across .pdata and .xdata, so this + // may not be sufficiently general for all users. + if (Name == ".xdata") { + UnregisteredEHFrameSections.push_back(SectionPair.second); + } + } + } +}; + +} // end namespace llvm + +#undef DEBUG_TYPE + +#endif diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOAArch64.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOAArch64.h new file mode 100644 index 0000000..dbca377 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOAArch64.h @@ -0,0 +1,406 @@ +//===-- RuntimeDyldMachOAArch64.h -- MachO/AArch64 specific code. -*- C++ -*-=// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOAARCH64_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOAARCH64_H + +#include "../RuntimeDyldMachO.h" +#include "llvm/Support/Endian.h" + +#define DEBUG_TYPE "dyld" + +namespace llvm { + +class RuntimeDyldMachOAArch64 + : public RuntimeDyldMachOCRTPBase<RuntimeDyldMachOAArch64> { +public: + + typedef uint64_t TargetPtrT; + + RuntimeDyldMachOAArch64(RuntimeDyld::MemoryManager &MM, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldMachOCRTPBase(MM, Resolver) {} + + unsigned getMaxStubSize() override { return 8; } + + unsigned getStubAlignment() override { return 8; } + + /// Extract the addend encoded in the instruction / memory location. + int64_t decodeAddend(const RelocationEntry &RE) const { + const SectionEntry &Section = Sections[RE.SectionID]; + uint8_t *LocalAddress = Section.getAddressWithOffset(RE.Offset); + unsigned NumBytes = 1 << RE.Size; + int64_t Addend = 0; + // Verify that the relocation has the correct size and alignment. + switch (RE.RelType) { + default: + llvm_unreachable("Unsupported relocation type!"); + case MachO::ARM64_RELOC_UNSIGNED: + assert((NumBytes == 4 || NumBytes == 8) && "Invalid relocation size."); + break; + case MachO::ARM64_RELOC_BRANCH26: + case MachO::ARM64_RELOC_PAGE21: + case MachO::ARM64_RELOC_PAGEOFF12: + case MachO::ARM64_RELOC_GOT_LOAD_PAGE21: + case MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12: + assert(NumBytes == 4 && "Invalid relocation size."); + assert((((uintptr_t)LocalAddress & 0x3) == 0) && + "Instruction address is not aligned to 4 bytes."); + break; + } + + switch (RE.RelType) { + default: + llvm_unreachable("Unsupported relocation type!"); + case MachO::ARM64_RELOC_UNSIGNED: + // This could be an unaligned memory location. + if (NumBytes == 4) + Addend = *reinterpret_cast<support::ulittle32_t *>(LocalAddress); + else + Addend = *reinterpret_cast<support::ulittle64_t *>(LocalAddress); + break; + case MachO::ARM64_RELOC_BRANCH26: { + // Verify that the relocation points to the expected branch instruction. + auto *p = reinterpret_cast<support::aligned_ulittle32_t *>(LocalAddress); + assert((*p & 0xFC000000) == 0x14000000 && "Expected branch instruction."); + + // Get the 26 bit addend encoded in the branch instruction and sign-extend + // to 64 bit. The lower 2 bits are always zeros and are therefore implicit + // (<< 2). + Addend = (*p & 0x03FFFFFF) << 2; + Addend = SignExtend64(Addend, 28); + break; + } + case MachO::ARM64_RELOC_GOT_LOAD_PAGE21: + case MachO::ARM64_RELOC_PAGE21: { + // Verify that the relocation points to the expected adrp instruction. + auto *p = reinterpret_cast<support::aligned_ulittle32_t *>(LocalAddress); + assert((*p & 0x9F000000) == 0x90000000 && "Expected adrp instruction."); + + // Get the 21 bit addend encoded in the adrp instruction and sign-extend + // to 64 bit. The lower 12 bits (4096 byte page) are always zeros and are + // therefore implicit (<< 12). + Addend = ((*p & 0x60000000) >> 29) | ((*p & 0x01FFFFE0) >> 3) << 12; + Addend = SignExtend64(Addend, 33); + break; + } + case MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12: { + // Verify that the relocation points to one of the expected load / store + // instructions. + auto *p = reinterpret_cast<support::aligned_ulittle32_t *>(LocalAddress); + (void)p; + assert((*p & 0x3B000000) == 0x39000000 && + "Only expected load / store instructions."); + } // fall-through + case MachO::ARM64_RELOC_PAGEOFF12: { + // Verify that the relocation points to one of the expected load / store + // or add / sub instructions. + auto *p = reinterpret_cast<support::aligned_ulittle32_t *>(LocalAddress); + assert((((*p & 0x3B000000) == 0x39000000) || + ((*p & 0x11C00000) == 0x11000000) ) && + "Expected load / store or add/sub instruction."); + + // Get the 12 bit addend encoded in the instruction. + Addend = (*p & 0x003FFC00) >> 10; + + // Check which instruction we are decoding to obtain the implicit shift + // factor of the instruction. + int ImplicitShift = 0; + if ((*p & 0x3B000000) == 0x39000000) { // << load / store + // For load / store instructions the size is encoded in bits 31:30. + ImplicitShift = ((*p >> 30) & 0x3); + if (ImplicitShift == 0) { + // Check if this a vector op to get the correct shift value. + if ((*p & 0x04800000) == 0x04800000) + ImplicitShift = 4; + } + } + // Compensate for implicit shift. + Addend <<= ImplicitShift; + break; + } + } + return Addend; + } + + /// Extract the addend encoded in the instruction. + void encodeAddend(uint8_t *LocalAddress, unsigned NumBytes, + MachO::RelocationInfoType RelType, int64_t Addend) const { + // Verify that the relocation has the correct alignment. + switch (RelType) { + default: + llvm_unreachable("Unsupported relocation type!"); + case MachO::ARM64_RELOC_UNSIGNED: + assert((NumBytes == 4 || NumBytes == 8) && "Invalid relocation size."); + break; + case MachO::ARM64_RELOC_BRANCH26: + case MachO::ARM64_RELOC_PAGE21: + case MachO::ARM64_RELOC_PAGEOFF12: + case MachO::ARM64_RELOC_GOT_LOAD_PAGE21: + case MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12: + assert(NumBytes == 4 && "Invalid relocation size."); + assert((((uintptr_t)LocalAddress & 0x3) == 0) && + "Instruction address is not aligned to 4 bytes."); + break; + } + + switch (RelType) { + default: + llvm_unreachable("Unsupported relocation type!"); + case MachO::ARM64_RELOC_UNSIGNED: + // This could be an unaligned memory location. + if (NumBytes == 4) + *reinterpret_cast<support::ulittle32_t *>(LocalAddress) = Addend; + else + *reinterpret_cast<support::ulittle64_t *>(LocalAddress) = Addend; + break; + case MachO::ARM64_RELOC_BRANCH26: { + auto *p = reinterpret_cast<support::aligned_ulittle32_t *>(LocalAddress); + // Verify that the relocation points to the expected branch instruction. + assert((*p & 0xFC000000) == 0x14000000 && "Expected branch instruction."); + + // Verify addend value. + assert((Addend & 0x3) == 0 && "Branch target is not aligned"); + assert(isInt<28>(Addend) && "Branch target is out of range."); + + // Encode the addend as 26 bit immediate in the branch instruction. + *p = (*p & 0xFC000000) | ((uint32_t)(Addend >> 2) & 0x03FFFFFF); + break; + } + case MachO::ARM64_RELOC_GOT_LOAD_PAGE21: + case MachO::ARM64_RELOC_PAGE21: { + // Verify that the relocation points to the expected adrp instruction. + auto *p = reinterpret_cast<support::aligned_ulittle32_t *>(LocalAddress); + assert((*p & 0x9F000000) == 0x90000000 && "Expected adrp instruction."); + + // Check that the addend fits into 21 bits (+ 12 lower bits). + assert((Addend & 0xFFF) == 0 && "ADRP target is not page aligned."); + assert(isInt<33>(Addend) && "Invalid page reloc value."); + + // Encode the addend into the instruction. + uint32_t ImmLoValue = ((uint64_t)Addend << 17) & 0x60000000; + uint32_t ImmHiValue = ((uint64_t)Addend >> 9) & 0x00FFFFE0; + *p = (*p & 0x9F00001F) | ImmHiValue | ImmLoValue; + break; + } + case MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12: { + // Verify that the relocation points to one of the expected load / store + // instructions. + auto *p = reinterpret_cast<support::aligned_ulittle32_t *>(LocalAddress); + assert((*p & 0x3B000000) == 0x39000000 && + "Only expected load / store instructions."); + (void)p; + } // fall-through + case MachO::ARM64_RELOC_PAGEOFF12: { + // Verify that the relocation points to one of the expected load / store + // or add / sub instructions. + auto *p = reinterpret_cast<support::aligned_ulittle32_t *>(LocalAddress); + assert((((*p & 0x3B000000) == 0x39000000) || + ((*p & 0x11C00000) == 0x11000000) ) && + "Expected load / store or add/sub instruction."); + + // Check which instruction we are decoding to obtain the implicit shift + // factor of the instruction and verify alignment. + int ImplicitShift = 0; + if ((*p & 0x3B000000) == 0x39000000) { // << load / store + // For load / store instructions the size is encoded in bits 31:30. + ImplicitShift = ((*p >> 30) & 0x3); + switch (ImplicitShift) { + case 0: + // Check if this a vector op to get the correct shift value. + if ((*p & 0x04800000) == 0x04800000) { + ImplicitShift = 4; + assert(((Addend & 0xF) == 0) && + "128-bit LDR/STR not 16-byte aligned."); + } + break; + case 1: + assert(((Addend & 0x1) == 0) && "16-bit LDR/STR not 2-byte aligned."); + break; + case 2: + assert(((Addend & 0x3) == 0) && "32-bit LDR/STR not 4-byte aligned."); + break; + case 3: + assert(((Addend & 0x7) == 0) && "64-bit LDR/STR not 8-byte aligned."); + break; + } + } + // Compensate for implicit shift. + Addend >>= ImplicitShift; + assert(isUInt<12>(Addend) && "Addend cannot be encoded."); + + // Encode the addend into the instruction. + *p = (*p & 0xFFC003FF) | ((uint32_t)(Addend << 10) & 0x003FFC00); + break; + } + } + } + + relocation_iterator + processRelocationRef(unsigned SectionID, relocation_iterator RelI, + const ObjectFile &BaseObjT, + ObjSectionToIDMap &ObjSectionToID, + StubMap &Stubs) override { + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile &>(BaseObjT); + MachO::any_relocation_info RelInfo = + Obj.getRelocation(RelI->getRawDataRefImpl()); + + assert(!Obj.isRelocationScattered(RelInfo) && ""); + + // ARM64 has an ARM64_RELOC_ADDEND relocation type that carries an explicit + // addend for the following relocation. If found: (1) store the associated + // addend, (2) consume the next relocation, and (3) use the stored addend to + // override the addend. + int64_t ExplicitAddend = 0; + if (Obj.getAnyRelocationType(RelInfo) == MachO::ARM64_RELOC_ADDEND) { + assert(!Obj.getPlainRelocationExternal(RelInfo)); + assert(!Obj.getAnyRelocationPCRel(RelInfo)); + assert(Obj.getAnyRelocationLength(RelInfo) == 2); + int64_t RawAddend = Obj.getPlainRelocationSymbolNum(RelInfo); + // Sign-extend the 24-bit to 64-bit. + ExplicitAddend = SignExtend64(RawAddend, 24); + ++RelI; + RelInfo = Obj.getRelocation(RelI->getRawDataRefImpl()); + } + + RelocationEntry RE(getRelocationEntry(SectionID, Obj, RelI)); + RE.Addend = decodeAddend(RE); + + assert((ExplicitAddend == 0 || RE.Addend == 0) && "Relocation has "\ + "ARM64_RELOC_ADDEND and embedded addend in the instruction."); + if (ExplicitAddend) + RE.Addend = ExplicitAddend; + + RelocationValueRef Value( + getRelocationValueRef(Obj, RelI, RE, ObjSectionToID)); + + bool IsExtern = Obj.getPlainRelocationExternal(RelInfo); + if (!IsExtern && RE.IsPCRel) + makeValueAddendPCRel(Value, RelI, 1 << RE.Size); + + RE.Addend = Value.Offset; + + if (RE.RelType == MachO::ARM64_RELOC_GOT_LOAD_PAGE21 || + RE.RelType == MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12) + processGOTRelocation(RE, Value, Stubs); + else { + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + } + + return ++RelI; + } + + void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override { + DEBUG(dumpRelocationToResolve(RE, Value)); + + const SectionEntry &Section = Sections[RE.SectionID]; + uint8_t *LocalAddress = Section.getAddressWithOffset(RE.Offset); + MachO::RelocationInfoType RelType = + static_cast<MachO::RelocationInfoType>(RE.RelType); + + switch (RelType) { + default: + llvm_unreachable("Invalid relocation type!"); + case MachO::ARM64_RELOC_UNSIGNED: { + assert(!RE.IsPCRel && "PCRel and ARM64_RELOC_UNSIGNED not supported"); + // Mask in the target value a byte at a time (we don't have an alignment + // guarantee for the target address, so this is safest). + if (RE.Size < 2) + llvm_unreachable("Invalid size for ARM64_RELOC_UNSIGNED"); + + encodeAddend(LocalAddress, 1 << RE.Size, RelType, Value + RE.Addend); + break; + } + case MachO::ARM64_RELOC_BRANCH26: { + assert(RE.IsPCRel && "not PCRel and ARM64_RELOC_BRANCH26 not supported"); + // Check if branch is in range. + uint64_t FinalAddress = Section.getLoadAddressWithOffset(RE.Offset); + int64_t PCRelVal = Value - FinalAddress + RE.Addend; + encodeAddend(LocalAddress, /*Size=*/4, RelType, PCRelVal); + break; + } + case MachO::ARM64_RELOC_GOT_LOAD_PAGE21: + case MachO::ARM64_RELOC_PAGE21: { + assert(RE.IsPCRel && "not PCRel and ARM64_RELOC_PAGE21 not supported"); + // Adjust for PC-relative relocation and offset. + uint64_t FinalAddress = Section.getLoadAddressWithOffset(RE.Offset); + int64_t PCRelVal = + ((Value + RE.Addend) & (-4096)) - (FinalAddress & (-4096)); + encodeAddend(LocalAddress, /*Size=*/4, RelType, PCRelVal); + break; + } + case MachO::ARM64_RELOC_GOT_LOAD_PAGEOFF12: + case MachO::ARM64_RELOC_PAGEOFF12: { + assert(!RE.IsPCRel && "PCRel and ARM64_RELOC_PAGEOFF21 not supported"); + // Add the offset from the symbol. + Value += RE.Addend; + // Mask out the page address and only use the lower 12 bits. + Value &= 0xFFF; + encodeAddend(LocalAddress, /*Size=*/4, RelType, Value); + break; + } + case MachO::ARM64_RELOC_SUBTRACTOR: + case MachO::ARM64_RELOC_POINTER_TO_GOT: + case MachO::ARM64_RELOC_TLVP_LOAD_PAGE21: + case MachO::ARM64_RELOC_TLVP_LOAD_PAGEOFF12: + llvm_unreachable("Relocation type not yet implemented!"); + case MachO::ARM64_RELOC_ADDEND: + llvm_unreachable("ARM64_RELOC_ADDEND should have been handeled by " + "processRelocationRef!"); + } + } + + void finalizeSection(const ObjectFile &Obj, unsigned SectionID, + const SectionRef &Section) {} + +private: + void processGOTRelocation(const RelocationEntry &RE, + RelocationValueRef &Value, StubMap &Stubs) { + assert(RE.Size == 2); + SectionEntry &Section = Sections[RE.SectionID]; + StubMap::const_iterator i = Stubs.find(Value); + int64_t Offset; + if (i != Stubs.end()) + Offset = static_cast<int64_t>(i->second); + else { + // FIXME: There must be a better way to do this then to check and fix the + // alignment every time!!! + uintptr_t BaseAddress = uintptr_t(Section.getAddress()); + uintptr_t StubAlignment = getStubAlignment(); + uintptr_t StubAddress = + (BaseAddress + Section.getStubOffset() + StubAlignment - 1) & + -StubAlignment; + unsigned StubOffset = StubAddress - BaseAddress; + Stubs[Value] = StubOffset; + assert(((StubAddress % getStubAlignment()) == 0) && + "GOT entry not aligned"); + RelocationEntry GOTRE(RE.SectionID, StubOffset, + MachO::ARM64_RELOC_UNSIGNED, Value.Offset, + /*IsPCRel=*/false, /*Size=*/3); + if (Value.SymbolName) + addRelocationForSymbol(GOTRE, Value.SymbolName); + else + addRelocationForSection(GOTRE, Value.SectionID); + Section.advanceStubOffset(getMaxStubSize()); + Offset = static_cast<int64_t>(StubOffset); + } + RelocationEntry TargetRE(RE.SectionID, RE.Offset, RE.RelType, Offset, + RE.IsPCRel, RE.Size); + addRelocationForSection(TargetRE, RE.SectionID); + } +}; +} + +#undef DEBUG_TYPE + +#endif diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOARM.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOARM.h new file mode 100644 index 0000000..7731df0 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOARM.h @@ -0,0 +1,280 @@ +//===----- RuntimeDyldMachOARM.h ---- MachO/ARM specific code. ----*- C++ -*-=// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOARM_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOARM_H + +#include "../RuntimeDyldMachO.h" + +#define DEBUG_TYPE "dyld" + +namespace llvm { + +class RuntimeDyldMachOARM + : public RuntimeDyldMachOCRTPBase<RuntimeDyldMachOARM> { +private: + typedef RuntimeDyldMachOCRTPBase<RuntimeDyldMachOARM> ParentT; + +public: + + typedef uint32_t TargetPtrT; + + RuntimeDyldMachOARM(RuntimeDyld::MemoryManager &MM, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldMachOCRTPBase(MM, Resolver) {} + + unsigned getMaxStubSize() override { return 8; } + + unsigned getStubAlignment() override { return 4; } + + int64_t decodeAddend(const RelocationEntry &RE) const { + const SectionEntry &Section = Sections[RE.SectionID]; + uint8_t *LocalAddress = Section.getAddressWithOffset(RE.Offset); + + switch (RE.RelType) { + default: + return memcpyAddend(RE); + case MachO::ARM_RELOC_BR24: { + uint32_t Temp = readBytesUnaligned(LocalAddress, 4); + Temp &= 0x00ffffff; // Mask out the opcode. + // Now we've got the shifted immediate, shift by 2, sign extend and ret. + return SignExtend32<26>(Temp << 2); + } + } + } + + relocation_iterator + processRelocationRef(unsigned SectionID, relocation_iterator RelI, + const ObjectFile &BaseObjT, + ObjSectionToIDMap &ObjSectionToID, + StubMap &Stubs) override { + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile &>(BaseObjT); + MachO::any_relocation_info RelInfo = + Obj.getRelocation(RelI->getRawDataRefImpl()); + uint32_t RelType = Obj.getAnyRelocationType(RelInfo); + + if (Obj.isRelocationScattered(RelInfo)) { + if (RelType == MachO::ARM_RELOC_HALF_SECTDIFF) + return processHALFSECTDIFFRelocation(SectionID, RelI, Obj, + ObjSectionToID); + else if (RelType == MachO::GENERIC_RELOC_VANILLA) + return processScatteredVANILLA(SectionID, RelI, Obj, ObjSectionToID); + else + return ++RelI; + } + + RelocationEntry RE(getRelocationEntry(SectionID, Obj, RelI)); + RE.Addend = decodeAddend(RE); + RelocationValueRef Value( + getRelocationValueRef(Obj, RelI, RE, ObjSectionToID)); + + if (RE.IsPCRel) + makeValueAddendPCRel(Value, RelI, 8); + + if ((RE.RelType & 0xf) == MachO::ARM_RELOC_BR24) + processBranchRelocation(RE, Value, Stubs); + else { + RE.Addend = Value.Offset; + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + } + + return ++RelI; + } + + void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override { + DEBUG(dumpRelocationToResolve(RE, Value)); + const SectionEntry &Section = Sections[RE.SectionID]; + uint8_t *LocalAddress = Section.getAddressWithOffset(RE.Offset); + + // If the relocation is PC-relative, the value to be encoded is the + // pointer difference. + if (RE.IsPCRel) { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(RE.Offset); + Value -= FinalAddress; + // ARM PCRel relocations have an effective-PC offset of two instructions + // (four bytes in Thumb mode, 8 bytes in ARM mode). + // FIXME: For now, assume ARM mode. + Value -= 8; + } + + switch (RE.RelType) { + default: + llvm_unreachable("Invalid relocation type!"); + case MachO::ARM_RELOC_VANILLA: + writeBytesUnaligned(Value + RE.Addend, LocalAddress, 1 << RE.Size); + break; + case MachO::ARM_RELOC_BR24: { + // Mask the value into the target address. We know instructions are + // 32-bit aligned, so we can do it all at once. + Value += RE.Addend; + // The low two bits of the value are not encoded. + Value >>= 2; + // Mask the value to 24 bits. + uint64_t FinalValue = Value & 0xffffff; + // FIXME: If the destination is a Thumb function (and the instruction + // is a non-predicated BL instruction), we need to change it to a BLX + // instruction instead. + + // Insert the value into the instruction. + uint32_t Temp = readBytesUnaligned(LocalAddress, 4); + writeBytesUnaligned((Temp & ~0xffffff) | FinalValue, LocalAddress, 4); + + break; + } + case MachO::ARM_RELOC_HALF_SECTDIFF: { + uint64_t SectionABase = Sections[RE.Sections.SectionA].getLoadAddress(); + uint64_t SectionBBase = Sections[RE.Sections.SectionB].getLoadAddress(); + assert((Value == SectionABase || Value == SectionBBase) && + "Unexpected HALFSECTDIFF relocation value."); + Value = SectionABase - SectionBBase + RE.Addend; + if (RE.Size & 0x1) // :upper16: + Value = (Value >> 16); + Value &= 0xffff; + + uint32_t Insn = readBytesUnaligned(LocalAddress, 4); + Insn = (Insn & 0xfff0f000) | ((Value & 0xf000) << 4) | (Value & 0x0fff); + writeBytesUnaligned(Insn, LocalAddress, 4); + break; + } + + case MachO::ARM_THUMB_RELOC_BR22: + case MachO::ARM_THUMB_32BIT_BRANCH: + case MachO::ARM_RELOC_HALF: + case MachO::ARM_RELOC_PAIR: + case MachO::ARM_RELOC_SECTDIFF: + case MachO::ARM_RELOC_LOCAL_SECTDIFF: + case MachO::ARM_RELOC_PB_LA_PTR: + Error("Relocation type not implemented yet!"); + return; + } + } + + void finalizeSection(const ObjectFile &Obj, unsigned SectionID, + const SectionRef &Section) { + StringRef Name; + Section.getName(Name); + + if (Name == "__nl_symbol_ptr") + populateIndirectSymbolPointersSection(cast<MachOObjectFile>(Obj), + Section, SectionID); + } + +private: + + void processBranchRelocation(const RelocationEntry &RE, + const RelocationValueRef &Value, + StubMap &Stubs) { + // This is an ARM branch relocation, need to use a stub function. + // Look up for existing stub. + SectionEntry &Section = Sections[RE.SectionID]; + RuntimeDyldMachO::StubMap::const_iterator i = Stubs.find(Value); + uint8_t *Addr; + if (i != Stubs.end()) { + Addr = Section.getAddressWithOffset(i->second); + } else { + // Create a new stub function. + Stubs[Value] = Section.getStubOffset(); + uint8_t *StubTargetAddr = createStubFunction( + Section.getAddressWithOffset(Section.getStubOffset())); + RelocationEntry StubRE( + RE.SectionID, StubTargetAddr - Section.getAddress(), + MachO::GENERIC_RELOC_VANILLA, Value.Offset, false, 2); + if (Value.SymbolName) + addRelocationForSymbol(StubRE, Value.SymbolName); + else + addRelocationForSection(StubRE, Value.SectionID); + Addr = Section.getAddressWithOffset(Section.getStubOffset()); + Section.advanceStubOffset(getMaxStubSize()); + } + RelocationEntry TargetRE(RE.SectionID, RE.Offset, RE.RelType, 0, + RE.IsPCRel, RE.Size); + resolveRelocation(TargetRE, (uint64_t)Addr); + } + + relocation_iterator + processHALFSECTDIFFRelocation(unsigned SectionID, relocation_iterator RelI, + const ObjectFile &BaseTObj, + ObjSectionToIDMap &ObjSectionToID) { + const MachOObjectFile &MachO = + static_cast<const MachOObjectFile&>(BaseTObj); + MachO::any_relocation_info RE = + MachO.getRelocation(RelI->getRawDataRefImpl()); + + + // For a half-diff relocation the length bits actually record whether this + // is a movw/movt, and whether this is arm or thumb. + // Bit 0 indicates movw (b0 == 0) or movt (b0 == 1). + // Bit 1 indicates arm (b1 == 0) or thumb (b1 == 1). + unsigned HalfDiffKindBits = MachO.getAnyRelocationLength(RE); + if (HalfDiffKindBits & 0x2) + llvm_unreachable("Thumb not yet supported."); + + SectionEntry &Section = Sections[SectionID]; + uint32_t RelocType = MachO.getAnyRelocationType(RE); + bool IsPCRel = MachO.getAnyRelocationPCRel(RE); + uint64_t Offset = RelI->getOffset(); + uint8_t *LocalAddress = Section.getAddressWithOffset(Offset); + int64_t Immediate = readBytesUnaligned(LocalAddress, 4); // Copy the whole instruction out. + Immediate = ((Immediate >> 4) & 0xf000) | (Immediate & 0xfff); + + ++RelI; + MachO::any_relocation_info RE2 = + MachO.getRelocation(RelI->getRawDataRefImpl()); + uint32_t AddrA = MachO.getScatteredRelocationValue(RE); + section_iterator SAI = getSectionByAddress(MachO, AddrA); + assert(SAI != MachO.section_end() && "Can't find section for address A"); + uint64_t SectionABase = SAI->getAddress(); + uint64_t SectionAOffset = AddrA - SectionABase; + SectionRef SectionA = *SAI; + bool IsCode = SectionA.isText(); + uint32_t SectionAID = + findOrEmitSection(MachO, SectionA, IsCode, ObjSectionToID); + + uint32_t AddrB = MachO.getScatteredRelocationValue(RE2); + section_iterator SBI = getSectionByAddress(MachO, AddrB); + assert(SBI != MachO.section_end() && "Can't find section for address B"); + uint64_t SectionBBase = SBI->getAddress(); + uint64_t SectionBOffset = AddrB - SectionBBase; + SectionRef SectionB = *SBI; + uint32_t SectionBID = + findOrEmitSection(MachO, SectionB, IsCode, ObjSectionToID); + + uint32_t OtherHalf = MachO.getAnyRelocationAddress(RE2) & 0xffff; + unsigned Shift = (HalfDiffKindBits & 0x1) ? 16 : 0; + uint32_t FullImmVal = (Immediate << Shift) | (OtherHalf << (16 - Shift)); + int64_t Addend = FullImmVal - (AddrA - AddrB); + + // addend = Encoded - Expected + // = Encoded - (AddrA - AddrB) + + DEBUG(dbgs() << "Found SECTDIFF: AddrA: " << AddrA << ", AddrB: " << AddrB + << ", Addend: " << Addend << ", SectionA ID: " << SectionAID + << ", SectionAOffset: " << SectionAOffset + << ", SectionB ID: " << SectionBID + << ", SectionBOffset: " << SectionBOffset << "\n"); + RelocationEntry R(SectionID, Offset, RelocType, Addend, SectionAID, + SectionAOffset, SectionBID, SectionBOffset, IsPCRel, + HalfDiffKindBits); + + addRelocationForSection(R, SectionAID); + addRelocationForSection(R, SectionBID); + + return ++RelI; + } + +}; +} + +#undef DEBUG_TYPE + +#endif diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOI386.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOI386.h new file mode 100644 index 0000000..85059d7 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOI386.h @@ -0,0 +1,224 @@ +//===---- RuntimeDyldMachOI386.h ---- MachO/I386 specific code. ---*- C++ -*-=// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOI386_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOI386_H + +#include "../RuntimeDyldMachO.h" + +#define DEBUG_TYPE "dyld" + +namespace llvm { + +class RuntimeDyldMachOI386 + : public RuntimeDyldMachOCRTPBase<RuntimeDyldMachOI386> { +public: + + typedef uint32_t TargetPtrT; + + RuntimeDyldMachOI386(RuntimeDyld::MemoryManager &MM, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldMachOCRTPBase(MM, Resolver) {} + + unsigned getMaxStubSize() override { return 0; } + + unsigned getStubAlignment() override { return 1; } + + relocation_iterator + processRelocationRef(unsigned SectionID, relocation_iterator RelI, + const ObjectFile &BaseObjT, + ObjSectionToIDMap &ObjSectionToID, + StubMap &Stubs) override { + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile &>(BaseObjT); + MachO::any_relocation_info RelInfo = + Obj.getRelocation(RelI->getRawDataRefImpl()); + uint32_t RelType = Obj.getAnyRelocationType(RelInfo); + + if (Obj.isRelocationScattered(RelInfo)) { + if (RelType == MachO::GENERIC_RELOC_SECTDIFF || + RelType == MachO::GENERIC_RELOC_LOCAL_SECTDIFF) + return processSECTDIFFRelocation(SectionID, RelI, Obj, + ObjSectionToID); + else if (RelType == MachO::GENERIC_RELOC_VANILLA) + return processScatteredVANILLA(SectionID, RelI, Obj, ObjSectionToID); + llvm_unreachable("Unhandled scattered relocation."); + } + + RelocationEntry RE(getRelocationEntry(SectionID, Obj, RelI)); + RE.Addend = memcpyAddend(RE); + RelocationValueRef Value( + getRelocationValueRef(Obj, RelI, RE, ObjSectionToID)); + + // Addends for external, PC-rel relocations on i386 point back to the zero + // offset. Calculate the final offset from the relocation target instead. + // This allows us to use the same logic for both external and internal + // relocations in resolveI386RelocationRef. + // bool IsExtern = Obj.getPlainRelocationExternal(RelInfo); + // if (IsExtern && RE.IsPCRel) { + // uint64_t RelocAddr = 0; + // RelI->getAddress(RelocAddr); + // Value.Addend += RelocAddr + 4; + // } + if (RE.IsPCRel) + makeValueAddendPCRel(Value, RelI, 1 << RE.Size); + + RE.Addend = Value.Offset; + + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + + return ++RelI; + } + + void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override { + DEBUG(dumpRelocationToResolve(RE, Value)); + + const SectionEntry &Section = Sections[RE.SectionID]; + uint8_t *LocalAddress = Section.getAddressWithOffset(RE.Offset); + + if (RE.IsPCRel) { + uint64_t FinalAddress = Section.getLoadAddressWithOffset(RE.Offset); + Value -= FinalAddress + 4; // see MachOX86_64::resolveRelocation. + } + + switch (RE.RelType) { + default: + llvm_unreachable("Invalid relocation type!"); + case MachO::GENERIC_RELOC_VANILLA: + writeBytesUnaligned(Value + RE.Addend, LocalAddress, 1 << RE.Size); + break; + case MachO::GENERIC_RELOC_SECTDIFF: + case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: { + uint64_t SectionABase = Sections[RE.Sections.SectionA].getLoadAddress(); + uint64_t SectionBBase = Sections[RE.Sections.SectionB].getLoadAddress(); + assert((Value == SectionABase || Value == SectionBBase) && + "Unexpected SECTDIFF relocation value."); + Value = SectionABase - SectionBBase + RE.Addend; + writeBytesUnaligned(Value, LocalAddress, 1 << RE.Size); + break; + } + case MachO::GENERIC_RELOC_PB_LA_PTR: + Error("Relocation type not implemented yet!"); + } + } + + void finalizeSection(const ObjectFile &Obj, unsigned SectionID, + const SectionRef &Section) { + StringRef Name; + Section.getName(Name); + + if (Name == "__jump_table") + populateJumpTable(cast<MachOObjectFile>(Obj), Section, SectionID); + else if (Name == "__pointers") + populateIndirectSymbolPointersSection(cast<MachOObjectFile>(Obj), + Section, SectionID); + } + +private: + relocation_iterator + processSECTDIFFRelocation(unsigned SectionID, relocation_iterator RelI, + const ObjectFile &BaseObjT, + ObjSectionToIDMap &ObjSectionToID) { + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile&>(BaseObjT); + MachO::any_relocation_info RE = + Obj.getRelocation(RelI->getRawDataRefImpl()); + + SectionEntry &Section = Sections[SectionID]; + uint32_t RelocType = Obj.getAnyRelocationType(RE); + bool IsPCRel = Obj.getAnyRelocationPCRel(RE); + unsigned Size = Obj.getAnyRelocationLength(RE); + uint64_t Offset = RelI->getOffset(); + uint8_t *LocalAddress = Section.getAddressWithOffset(Offset); + unsigned NumBytes = 1 << Size; + uint64_t Addend = readBytesUnaligned(LocalAddress, NumBytes); + + ++RelI; + MachO::any_relocation_info RE2 = + Obj.getRelocation(RelI->getRawDataRefImpl()); + + uint32_t AddrA = Obj.getScatteredRelocationValue(RE); + section_iterator SAI = getSectionByAddress(Obj, AddrA); + assert(SAI != Obj.section_end() && "Can't find section for address A"); + uint64_t SectionABase = SAI->getAddress(); + uint64_t SectionAOffset = AddrA - SectionABase; + SectionRef SectionA = *SAI; + bool IsCode = SectionA.isText(); + uint32_t SectionAID = + findOrEmitSection(Obj, SectionA, IsCode, ObjSectionToID); + + uint32_t AddrB = Obj.getScatteredRelocationValue(RE2); + section_iterator SBI = getSectionByAddress(Obj, AddrB); + assert(SBI != Obj.section_end() && "Can't find section for address B"); + uint64_t SectionBBase = SBI->getAddress(); + uint64_t SectionBOffset = AddrB - SectionBBase; + SectionRef SectionB = *SBI; + uint32_t SectionBID = + findOrEmitSection(Obj, SectionB, IsCode, ObjSectionToID); + + // Compute the addend 'C' from the original expression 'A - B + C'. + Addend -= AddrA - AddrB; + + DEBUG(dbgs() << "Found SECTDIFF: AddrA: " << AddrA << ", AddrB: " << AddrB + << ", Addend: " << Addend << ", SectionA ID: " << SectionAID + << ", SectionAOffset: " << SectionAOffset + << ", SectionB ID: " << SectionBID + << ", SectionBOffset: " << SectionBOffset << "\n"); + RelocationEntry R(SectionID, Offset, RelocType, Addend, SectionAID, + SectionAOffset, SectionBID, SectionBOffset, + IsPCRel, Size); + + addRelocationForSection(R, SectionAID); + + return ++RelI; + } + + // Populate stubs in __jump_table section. + void populateJumpTable(const MachOObjectFile &Obj, const SectionRef &JTSection, + unsigned JTSectionID) { + assert(!Obj.is64Bit() && + "__jump_table section not supported in 64-bit MachO."); + + MachO::dysymtab_command DySymTabCmd = Obj.getDysymtabLoadCommand(); + MachO::section Sec32 = Obj.getSection(JTSection.getRawDataRefImpl()); + uint32_t JTSectionSize = Sec32.size; + unsigned FirstIndirectSymbol = Sec32.reserved1; + unsigned JTEntrySize = Sec32.reserved2; + unsigned NumJTEntries = JTSectionSize / JTEntrySize; + uint8_t *JTSectionAddr = getSectionAddress(JTSectionID); + unsigned JTEntryOffset = 0; + + assert((JTSectionSize % JTEntrySize) == 0 && + "Jump-table section does not contain a whole number of stubs?"); + + for (unsigned i = 0; i < NumJTEntries; ++i) { + unsigned SymbolIndex = + Obj.getIndirectSymbolTableEntry(DySymTabCmd, FirstIndirectSymbol + i); + symbol_iterator SI = Obj.getSymbolByIndex(SymbolIndex); + ErrorOr<StringRef> IndirectSymbolName = SI->getName(); + if (std::error_code EC = IndirectSymbolName.getError()) + report_fatal_error(EC.message()); + uint8_t *JTEntryAddr = JTSectionAddr + JTEntryOffset; + createStubFunction(JTEntryAddr); + RelocationEntry RE(JTSectionID, JTEntryOffset + 1, + MachO::GENERIC_RELOC_VANILLA, 0, true, 2); + addRelocationForSymbol(RE, *IndirectSymbolName); + JTEntryOffset += JTEntrySize; + } + } + +}; +} + +#undef DEBUG_TYPE + +#endif diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOX86_64.h b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOX86_64.h new file mode 100644 index 0000000..2242295 --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOX86_64.h @@ -0,0 +1,191 @@ +//===-- RuntimeDyldMachOX86_64.h ---- MachO/X86_64 specific code. -*- C++ -*-=// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOX86_64_H +#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDMACHOX86_64_H + +#include "../RuntimeDyldMachO.h" + +#define DEBUG_TYPE "dyld" + +namespace llvm { + +class RuntimeDyldMachOX86_64 + : public RuntimeDyldMachOCRTPBase<RuntimeDyldMachOX86_64> { +public: + + typedef uint64_t TargetPtrT; + + RuntimeDyldMachOX86_64(RuntimeDyld::MemoryManager &MM, + RuntimeDyld::SymbolResolver &Resolver) + : RuntimeDyldMachOCRTPBase(MM, Resolver) {} + + unsigned getMaxStubSize() override { return 8; } + + unsigned getStubAlignment() override { return 1; } + + relocation_iterator + processRelocationRef(unsigned SectionID, relocation_iterator RelI, + const ObjectFile &BaseObjT, + ObjSectionToIDMap &ObjSectionToID, + StubMap &Stubs) override { + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile &>(BaseObjT); + MachO::any_relocation_info RelInfo = + Obj.getRelocation(RelI->getRawDataRefImpl()); + uint32_t RelType = Obj.getAnyRelocationType(RelInfo); + + if (RelType == MachO::X86_64_RELOC_SUBTRACTOR) + return processSubtractRelocation(SectionID, RelI, Obj, ObjSectionToID); + + assert(!Obj.isRelocationScattered(RelInfo) && + "Scattered relocations not supported on X86_64"); + + RelocationEntry RE(getRelocationEntry(SectionID, Obj, RelI)); + RE.Addend = memcpyAddend(RE); + RelocationValueRef Value( + getRelocationValueRef(Obj, RelI, RE, ObjSectionToID)); + + bool IsExtern = Obj.getPlainRelocationExternal(RelInfo); + if (!IsExtern && RE.IsPCRel) + makeValueAddendPCRel(Value, RelI, 1 << RE.Size); + + if (RE.RelType == MachO::X86_64_RELOC_GOT || + RE.RelType == MachO::X86_64_RELOC_GOT_LOAD) + processGOTRelocation(RE, Value, Stubs); + else { + RE.Addend = Value.Offset; + if (Value.SymbolName) + addRelocationForSymbol(RE, Value.SymbolName); + else + addRelocationForSection(RE, Value.SectionID); + } + + return ++RelI; + } + + void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override { + DEBUG(dumpRelocationToResolve(RE, Value)); + const SectionEntry &Section = Sections[RE.SectionID]; + uint8_t *LocalAddress = Section.getAddressWithOffset(RE.Offset); + + // If the relocation is PC-relative, the value to be encoded is the + // pointer difference. + if (RE.IsPCRel) { + // FIXME: It seems this value needs to be adjusted by 4 for an effective + // PC address. Is that expected? Only for branches, perhaps? + uint64_t FinalAddress = Section.getLoadAddressWithOffset(RE.Offset); + Value -= FinalAddress + 4; + } + + switch (RE.RelType) { + default: + llvm_unreachable("Invalid relocation type!"); + case MachO::X86_64_RELOC_SIGNED_1: + case MachO::X86_64_RELOC_SIGNED_2: + case MachO::X86_64_RELOC_SIGNED_4: + case MachO::X86_64_RELOC_SIGNED: + case MachO::X86_64_RELOC_UNSIGNED: + case MachO::X86_64_RELOC_BRANCH: + writeBytesUnaligned(Value + RE.Addend, LocalAddress, 1 << RE.Size); + break; + case MachO::X86_64_RELOC_SUBTRACTOR: { + uint64_t SectionABase = Sections[RE.Sections.SectionA].getLoadAddress(); + uint64_t SectionBBase = Sections[RE.Sections.SectionB].getLoadAddress(); + assert((Value == SectionABase || Value == SectionBBase) && + "Unexpected SUBTRACTOR relocation value."); + Value = SectionABase - SectionBBase + RE.Addend; + writeBytesUnaligned(Value, LocalAddress, 1 << RE.Size); + break; + } + case MachO::X86_64_RELOC_GOT_LOAD: + case MachO::X86_64_RELOC_GOT: + case MachO::X86_64_RELOC_TLV: + Error("Relocation type not implemented yet!"); + } + } + + void finalizeSection(const ObjectFile &Obj, unsigned SectionID, + const SectionRef &Section) {} + +private: + void processGOTRelocation(const RelocationEntry &RE, + RelocationValueRef &Value, StubMap &Stubs) { + SectionEntry &Section = Sections[RE.SectionID]; + assert(RE.IsPCRel); + assert(RE.Size == 2); + Value.Offset -= RE.Addend; + RuntimeDyldMachO::StubMap::const_iterator i = Stubs.find(Value); + uint8_t *Addr; + if (i != Stubs.end()) { + Addr = Section.getAddressWithOffset(i->second); + } else { + Stubs[Value] = Section.getStubOffset(); + uint8_t *GOTEntry = Section.getAddressWithOffset(Section.getStubOffset()); + RelocationEntry GOTRE(RE.SectionID, Section.getStubOffset(), + MachO::X86_64_RELOC_UNSIGNED, Value.Offset, false, + 3); + if (Value.SymbolName) + addRelocationForSymbol(GOTRE, Value.SymbolName); + else + addRelocationForSection(GOTRE, Value.SectionID); + Section.advanceStubOffset(8); + Addr = GOTEntry; + } + RelocationEntry TargetRE(RE.SectionID, RE.Offset, + MachO::X86_64_RELOC_UNSIGNED, RE.Addend, true, 2); + resolveRelocation(TargetRE, (uint64_t)Addr); + } + + relocation_iterator + processSubtractRelocation(unsigned SectionID, relocation_iterator RelI, + const ObjectFile &BaseObjT, + ObjSectionToIDMap &ObjSectionToID) { + const MachOObjectFile &Obj = + static_cast<const MachOObjectFile&>(BaseObjT); + MachO::any_relocation_info RE = + Obj.getRelocation(RelI->getRawDataRefImpl()); + + unsigned Size = Obj.getAnyRelocationLength(RE); + uint64_t Offset = RelI->getOffset(); + uint8_t *LocalAddress = Sections[SectionID].getAddressWithOffset(Offset); + unsigned NumBytes = 1 << Size; + + ErrorOr<StringRef> SubtrahendNameOrErr = RelI->getSymbol()->getName(); + if (auto EC = SubtrahendNameOrErr.getError()) + report_fatal_error(EC.message()); + auto SubtrahendI = GlobalSymbolTable.find(*SubtrahendNameOrErr); + unsigned SectionBID = SubtrahendI->second.getSectionID(); + uint64_t SectionBOffset = SubtrahendI->second.getOffset(); + int64_t Addend = + SignExtend64(readBytesUnaligned(LocalAddress, NumBytes), NumBytes * 8); + + ++RelI; + ErrorOr<StringRef> MinuendNameOrErr = RelI->getSymbol()->getName(); + if (auto EC = MinuendNameOrErr.getError()) + report_fatal_error(EC.message()); + auto MinuendI = GlobalSymbolTable.find(*MinuendNameOrErr); + unsigned SectionAID = MinuendI->second.getSectionID(); + uint64_t SectionAOffset = MinuendI->second.getOffset(); + + RelocationEntry R(SectionID, Offset, MachO::X86_64_RELOC_SUBTRACTOR, (uint64_t)Addend, + SectionAID, SectionAOffset, SectionBID, SectionBOffset, + false, Size); + + addRelocationForSection(R, SectionAID); + + return ++RelI; + } + +}; +} + +#undef DEBUG_TYPE + +#endif |
