lib/Object/ELFObjectFile.cpp

51690af2SDimitry Andric//===- ELFObjectFile.cpp - ELF object file implementation -----------------===//
2754fe60SDimitry Andric//
2754fe60SDimitry Andric//                     The LLVM Compiler Infrastructure
2754fe60SDimitry Andric//
2754fe60SDimitry Andric// This file is distributed under the University of Illinois Open Source
2754fe60SDimitry Andric// License. See LICENSE.TXT for details.
2754fe60SDimitry Andric//
2754fe60SDimitry Andric//===----------------------------------------------------------------------===//
2754fe60SDimitry Andric//
dff0c46cSDimitry Andric// Part of the ELFObjectFile class implementation.
2754fe60SDimitry Andric//
2754fe60SDimitry Andric//===----------------------------------------------------------------------===//
2754fe60SDimitry Andric
db17bf38SDimitry Andric#include "llvm/Object/ELFObjectFile.h"
51690af2SDimitry Andric#include "llvm/ADT/Triple.h"
db17bf38SDimitry Andric#include "llvm/BinaryFormat/ELF.h"
51690af2SDimitry Andric#include "llvm/MC/SubtargetFeature.h"
51690af2SDimitry Andric#include "llvm/Object/ELF.h"
51690af2SDimitry Andric#include "llvm/Object/ELFTypes.h"
51690af2SDimitry Andric#include "llvm/Object/Error.h"
7a7e6055SDimitry Andric#include "llvm/Support/ARMAttributeParser.h"
db17bf38SDimitry Andric#include "llvm/Support/ARMBuildAttributes.h"
51690af2SDimitry Andric#include "llvm/Support/Endian.h"
51690af2SDimitry Andric#include "llvm/Support/ErrorHandling.h"
139f7f9bSDimitry Andric#include "llvm/Support/MathExtras.h"
51690af2SDimitry Andric#include <algorithm>
51690af2SDimitry Andric#include <cstddef>
51690af2SDimitry Andric#include <cstdint>
51690af2SDimitry Andric#include <memory>
51690af2SDimitry Andric#include <string>
51690af2SDimitry Andric#include <system_error>
51690af2SDimitry Andric#include <utility>
2754fe60SDimitry Andric
51690af2SDimitry Andricusing namespace llvm;
2754fe60SDimitry Andricusing namespace object;
2754fe60SDimitry Andric
39d628a0SDimitry AndricELFObjectFileBase::ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source)
39d628a0SDimitry Andric    : ObjectFile(Type, Source) {}
39d628a0SDimitry Andric
2cab237bSDimitry Andrictemplate <class ELFT>
2cab237bSDimitry Andricstatic Expected<std::unique_ptr<ELFObjectFile<ELFT>>>
2cab237bSDimitry AndriccreatePtr(MemoryBufferRef Object) {
2cab237bSDimitry Andric  auto Ret = ELFObjectFile<ELFT>::create(Object);
2cab237bSDimitry Andric  if (Error E = Ret.takeError())
2cab237bSDimitry Andric    return std::move(E);
2cab237bSDimitry Andric  return make_unique<ELFObjectFile<ELFT>>(std::move(*Ret));
2cab237bSDimitry Andric}
2cab237bSDimitry Andric
2cab237bSDimitry AndricExpected<std::unique_ptr<ObjectFile>>
39d628a0SDimitry AndricObjectFile::createELFObjectFile(MemoryBufferRef Obj) {
91bc56edSDimitry Andric  std::pair<unsigned char, unsigned char> Ident =
39d628a0SDimitry Andric      getElfArchType(Obj.getBuffer());
139f7f9bSDimitry Andric  std::size_t MaxAlignment =
39d628a0SDimitry Andric      1ULL << countTrailingZeros(uintptr_t(Obj.getBufferStart()));
139f7f9bSDimitry Andric
97bc6c73SDimitry Andric  if (MaxAlignment < 2)
2cab237bSDimitry Andric    return createError("Insufficient alignment");
97bc6c73SDimitry Andric
97bc6c73SDimitry Andric  if (Ident.first == ELF::ELFCLASS32) {
97bc6c73SDimitry Andric    if (Ident.second == ELF::ELFDATA2LSB)
2cab237bSDimitry Andric      return createPtr<ELF32LE>(Obj);
97bc6c73SDimitry Andric    else if (Ident.second == ELF::ELFDATA2MSB)
2cab237bSDimitry Andric      return createPtr<ELF32BE>(Obj);
139f7f9bSDimitry Andric    else
2cab237bSDimitry Andric      return createError("Invalid ELF data");
97bc6c73SDimitry Andric  } else if (Ident.first == ELF::ELFCLASS64) {
97bc6c73SDimitry Andric    if (Ident.second == ELF::ELFDATA2LSB)
2cab237bSDimitry Andric      return createPtr<ELF64LE>(Obj);
97bc6c73SDimitry Andric    else if (Ident.second == ELF::ELFDATA2MSB)
2cab237bSDimitry Andric      return createPtr<ELF64BE>(Obj);
139f7f9bSDimitry Andric    else
2cab237bSDimitry Andric      return createError("Invalid ELF data");
dff0c46cSDimitry Andric  }
2cab237bSDimitry Andric  return createError("Invalid ELF class");
2754fe60SDimitry Andric}
2754fe60SDimitry Andric
7a7e6055SDimitry AndricSubtargetFeatures ELFObjectFileBase::getMIPSFeatures() const {
3ca95b02SDimitry Andric  SubtargetFeatures Features;
3ca95b02SDimitry Andric  unsigned PlatformFlags;
3ca95b02SDimitry Andric  getPlatformFlags(PlatformFlags);
3ca95b02SDimitry Andric
3ca95b02SDimitry Andric  switch (PlatformFlags & ELF::EF_MIPS_ARCH) {
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_1:
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_2:
3ca95b02SDimitry Andric    Features.AddFeature("mips2");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_3:
3ca95b02SDimitry Andric    Features.AddFeature("mips3");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_4:
3ca95b02SDimitry Andric    Features.AddFeature("mips4");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_5:
3ca95b02SDimitry Andric    Features.AddFeature("mips5");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_32:
3ca95b02SDimitry Andric    Features.AddFeature("mips32");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_64:
3ca95b02SDimitry Andric    Features.AddFeature("mips64");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_32R2:
3ca95b02SDimitry Andric    Features.AddFeature("mips32r2");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_64R2:
3ca95b02SDimitry Andric    Features.AddFeature("mips64r2");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_32R6:
3ca95b02SDimitry Andric    Features.AddFeature("mips32r6");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_ARCH_64R6:
3ca95b02SDimitry Andric    Features.AddFeature("mips64r6");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  default:
3ca95b02SDimitry Andric    llvm_unreachable("Unknown EF_MIPS_ARCH value");
3ca95b02SDimitry Andric  }
3ca95b02SDimitry Andric
3ca95b02SDimitry Andric  switch (PlatformFlags & ELF::EF_MIPS_MACH) {
3ca95b02SDimitry Andric  case ELF::EF_MIPS_MACH_NONE:
3ca95b02SDimitry Andric    // No feature associated with this value.
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  case ELF::EF_MIPS_MACH_OCTEON:
3ca95b02SDimitry Andric    Features.AddFeature("cnmips");
3ca95b02SDimitry Andric    break;
3ca95b02SDimitry Andric  default:
3ca95b02SDimitry Andric    llvm_unreachable("Unknown EF_MIPS_ARCH value");
3ca95b02SDimitry Andric  }
3ca95b02SDimitry Andric
3ca95b02SDimitry Andric  if (PlatformFlags & ELF::EF_MIPS_ARCH_ASE_M16)
3ca95b02SDimitry Andric    Features.AddFeature("mips16");
3ca95b02SDimitry Andric  if (PlatformFlags & ELF::EF_MIPS_MICROMIPS)
3ca95b02SDimitry Andric    Features.AddFeature("micromips");
3ca95b02SDimitry Andric
3ca95b02SDimitry Andric  return Features;
3ca95b02SDimitry Andric}
7a7e6055SDimitry Andric
7a7e6055SDimitry AndricSubtargetFeatures ELFObjectFileBase::getARMFeatures() const {
7a7e6055SDimitry Andric  SubtargetFeatures Features;
7a7e6055SDimitry Andric  ARMAttributeParser Attributes;
7a7e6055SDimitry Andric  std::error_code EC = getBuildAttributes(Attributes);
7a7e6055SDimitry Andric  if (EC)
7a7e6055SDimitry Andric    return SubtargetFeatures();
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  // both ARMv7-M and R have to support thumb hardware div
7a7e6055SDimitry Andric  bool isV7 = false;
7a7e6055SDimitry Andric  if (Attributes.hasAttribute(ARMBuildAttrs::CPU_arch))
7a7e6055SDimitry Andric    isV7 = Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch)
7a7e6055SDimitry Andric      == ARMBuildAttrs::v7;
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  if (Attributes.hasAttribute(ARMBuildAttrs::CPU_arch_profile)) {
7a7e6055SDimitry Andric    switch(Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch_profile)) {
7a7e6055SDimitry Andric    case ARMBuildAttrs::ApplicationProfile:
7a7e6055SDimitry Andric      Features.AddFeature("aclass");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::RealTimeProfile:
7a7e6055SDimitry Andric      Features.AddFeature("rclass");
7a7e6055SDimitry Andric      if (isV7)
7a7e6055SDimitry Andric        Features.AddFeature("hwdiv");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::MicroControllerProfile:
7a7e6055SDimitry Andric      Features.AddFeature("mclass");
7a7e6055SDimitry Andric      if (isV7)
7a7e6055SDimitry Andric        Features.AddFeature("hwdiv");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    }
7a7e6055SDimitry Andric  }
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  if (Attributes.hasAttribute(ARMBuildAttrs::THUMB_ISA_use)) {
7a7e6055SDimitry Andric    switch(Attributes.getAttributeValue(ARMBuildAttrs::THUMB_ISA_use)) {
7a7e6055SDimitry Andric    default:
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::Not_Allowed:
7a7e6055SDimitry Andric      Features.AddFeature("thumb", false);
7a7e6055SDimitry Andric      Features.AddFeature("thumb2", false);
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::AllowThumb32:
7a7e6055SDimitry Andric      Features.AddFeature("thumb2");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    }
7a7e6055SDimitry Andric  }
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  if (Attributes.hasAttribute(ARMBuildAttrs::FP_arch)) {
7a7e6055SDimitry Andric    switch(Attributes.getAttributeValue(ARMBuildAttrs::FP_arch)) {
7a7e6055SDimitry Andric    default:
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::Not_Allowed:
7a7e6055SDimitry Andric      Features.AddFeature("vfp2", false);
7a7e6055SDimitry Andric      Features.AddFeature("vfp3", false);
7a7e6055SDimitry Andric      Features.AddFeature("vfp4", false);
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::AllowFPv2:
7a7e6055SDimitry Andric      Features.AddFeature("vfp2");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::AllowFPv3A:
7a7e6055SDimitry Andric    case ARMBuildAttrs::AllowFPv3B:
7a7e6055SDimitry Andric      Features.AddFeature("vfp3");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::AllowFPv4A:
7a7e6055SDimitry Andric    case ARMBuildAttrs::AllowFPv4B:
7a7e6055SDimitry Andric      Features.AddFeature("vfp4");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    }
7a7e6055SDimitry Andric  }
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  if (Attributes.hasAttribute(ARMBuildAttrs::Advanced_SIMD_arch)) {
7a7e6055SDimitry Andric    switch(Attributes.getAttributeValue(ARMBuildAttrs::Advanced_SIMD_arch)) {
7a7e6055SDimitry Andric    default:
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::Not_Allowed:
7a7e6055SDimitry Andric      Features.AddFeature("neon", false);
7a7e6055SDimitry Andric      Features.AddFeature("fp16", false);
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::AllowNeon:
7a7e6055SDimitry Andric      Features.AddFeature("neon");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::AllowNeon2:
7a7e6055SDimitry Andric      Features.AddFeature("neon");
7a7e6055SDimitry Andric      Features.AddFeature("fp16");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    }
7a7e6055SDimitry Andric  }
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  if (Attributes.hasAttribute(ARMBuildAttrs::DIV_use)) {
7a7e6055SDimitry Andric    switch(Attributes.getAttributeValue(ARMBuildAttrs::DIV_use)) {
7a7e6055SDimitry Andric    default:
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::DisallowDIV:
7a7e6055SDimitry Andric      Features.AddFeature("hwdiv", false);
7a7e6055SDimitry Andric      Features.AddFeature("hwdiv-arm", false);
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::AllowDIVExt:
7a7e6055SDimitry Andric      Features.AddFeature("hwdiv");
7a7e6055SDimitry Andric      Features.AddFeature("hwdiv-arm");
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    }
7a7e6055SDimitry Andric  }
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  return Features;
7a7e6055SDimitry Andric}
7a7e6055SDimitry Andric
7a7e6055SDimitry AndricSubtargetFeatures ELFObjectFileBase::getFeatures() const {
7a7e6055SDimitry Andric  switch (getEMachine()) {
7a7e6055SDimitry Andric  case ELF::EM_MIPS:
7a7e6055SDimitry Andric    return getMIPSFeatures();
7a7e6055SDimitry Andric  case ELF::EM_ARM:
7a7e6055SDimitry Andric    return getARMFeatures();
3ca95b02SDimitry Andric  default:
3ca95b02SDimitry Andric    return SubtargetFeatures();
3ca95b02SDimitry Andric  }
3ca95b02SDimitry Andric}
3ca95b02SDimitry Andric
7a7e6055SDimitry Andric// FIXME Encode from a tablegen description or target parser.
7a7e6055SDimitry Andricvoid ELFObjectFileBase::setARMSubArch(Triple &TheTriple) const {
7a7e6055SDimitry Andric  if (TheTriple.getSubArch() != Triple::NoSubArch)
7a7e6055SDimitry Andric    return;
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  ARMAttributeParser Attributes;
7a7e6055SDimitry Andric  std::error_code EC = getBuildAttributes(Attributes);
7a7e6055SDimitry Andric  if (EC)
7a7e6055SDimitry Andric    return;
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  std::string Triple;
7a7e6055SDimitry Andric  // Default to ARM, but use the triple if it's been set.
2cab237bSDimitry Andric  if (TheTriple.isThumb())
7a7e6055SDimitry Andric    Triple = "thumb";
7a7e6055SDimitry Andric  else
7a7e6055SDimitry Andric    Triple = "arm";
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  if (Attributes.hasAttribute(ARMBuildAttrs::CPU_arch)) {
7a7e6055SDimitry Andric    switch(Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch)) {
7a7e6055SDimitry Andric    case ARMBuildAttrs::v4:
7a7e6055SDimitry Andric      Triple += "v4";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v4T:
7a7e6055SDimitry Andric      Triple += "v4t";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v5T:
7a7e6055SDimitry Andric      Triple += "v5t";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v5TE:
7a7e6055SDimitry Andric      Triple += "v5te";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v5TEJ:
7a7e6055SDimitry Andric      Triple += "v5tej";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v6:
7a7e6055SDimitry Andric      Triple += "v6";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v6KZ:
7a7e6055SDimitry Andric      Triple += "v6kz";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v6T2:
7a7e6055SDimitry Andric      Triple += "v6t2";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v6K:
7a7e6055SDimitry Andric      Triple += "v6k";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v7:
7a7e6055SDimitry Andric      Triple += "v7";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v6_M:
7a7e6055SDimitry Andric      Triple += "v6m";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v6S_M:
7a7e6055SDimitry Andric      Triple += "v6sm";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    case ARMBuildAttrs::v7E_M:
7a7e6055SDimitry Andric      Triple += "v7em";
7a7e6055SDimitry Andric      break;
7a7e6055SDimitry Andric    }
7a7e6055SDimitry Andric  }
7a7e6055SDimitry Andric  if (!isLittleEndian())
7a7e6055SDimitry Andric    Triple += "eb";
7a7e6055SDimitry Andric
7a7e6055SDimitry Andric  TheTriple.setArchName(Triple);
7a7e6055SDimitry Andric}