Esempio n. 1
0
ErrorOr<void> X86TargetRelocationHandler::applyRelocation(
    ELFWriter &writer, llvm::FileOutputBuffer &buf, const lld::AtomLayout &atom,
    const Reference &ref) const {
  uint8_t *atomContent = buf.getBufferStart() + atom._fileOffset;
  uint8_t *location = atomContent + ref.offsetInAtom();
  uint64_t targetVAddress = writer.addressOfAtom(ref.target());
  uint64_t relocVAddress = atom._virtualAddr + ref.offsetInAtom();

  switch (ref.kind()) {
  case R_386_32:
    reloc32(location, relocVAddress, targetVAddress, ref.addend());
    break;
  case R_386_PC32:
    relocPC32(location, relocVAddress, targetVAddress, ref.addend());
    break;
  case lld::Reference::kindLayoutAfter:
  case lld::Reference::kindLayoutBefore:
  case lld::Reference::kindInGroup:
    break;
  default : {
    std::string str;
    llvm::raw_string_ostream s(str);
    auto name = _targetInfo.stringFromRelocKind(ref.kind());
    s << "Unhandled relocation: "
      << (name ? *name : "<unknown>" ) << " (" << ref.kind() << ")";
    s.flush();
    llvm_unreachable(str.c_str());
  }
  }

  return error_code::success();
}
Esempio n. 2
0
std::error_code X86TargetRelocationHandler::applyRelocation(
    ELFWriter &writer, llvm::FileOutputBuffer &buf, const AtomLayout &atom,
    const Reference &ref) const {
  uint8_t *atomContent = buf.getBufferStart() + atom._fileOffset;
  uint8_t *loc = atomContent + ref.offsetInAtom();
  uint64_t target = writer.addressOfAtom(ref.target());
  uint64_t reloc = atom._virtualAddr + ref.offsetInAtom();

  if (ref.kindNamespace() != Reference::KindNamespace::ELF)
    return std::error_code();
  assert(ref.kindArch() == Reference::KindArch::x86);
  switch (ref.kindValue()) {
  case R_386_32:
    reloc32(loc, reloc, target, ref.addend());
    break;
  case R_386_PC32:
    relocPC32(loc, reloc, target, ref.addend());
    break;
  default:
    return make_unhandled_reloc_error();
  }
  return std::error_code();
}
Esempio n. 3
0
std::error_code X86_64TargetRelocationHandler::applyRelocation(
    ELFWriter &writer, llvm::FileOutputBuffer &buf, const AtomLayout &atom,
    const Reference &ref) const {
  uint8_t *atomContent = buf.getBufferStart() + atom._fileOffset;
  uint8_t *loc = atomContent + ref.offsetInAtom();
  uint64_t target = writer.addressOfAtom(ref.target());
  uint64_t reloc = atom._virtualAddr + ref.offsetInAtom();

  if (ref.kindNamespace() != Reference::KindNamespace::ELF)
    return std::error_code();
  assert(ref.kindArch() == Reference::KindArch::x86_64);
  switch (ref.kindValue()) {
  case R_X86_64_NONE:
    break;
  case R_X86_64_64:
    reloc64(loc, reloc, target, ref.addend());
    break;
  case R_X86_64_PC32:
  case R_X86_64_GOTPCREL:
    relocPC32(loc, reloc, target, ref.addend());
    break;
  case R_X86_64_32:
    reloc32(loc, reloc, target, ref.addend());
    break;
  case R_X86_64_32S:
    reloc32S(loc, reloc, target, ref.addend());
    break;
  case R_X86_64_16:
    reloc16(loc, reloc, target, ref.addend());
    break;
  case R_X86_64_PC16:
    relocPC16(loc, reloc, target, ref.addend());
    break;
  case R_X86_64_TPOFF64:
  case R_X86_64_DTPOFF32:
  case R_X86_64_TPOFF32: {
    _tlsSize = _layout.getTLSSize();
    if (ref.kindValue() == R_X86_64_TPOFF32 ||
        ref.kindValue() == R_X86_64_DTPOFF32) {
      write32le(loc, target - _tlsSize);
    } else {
      write64le(loc, target - _tlsSize);
    }
    break;
  }
  case R_X86_64_TLSGD: {
    relocPC32(loc, reloc, target, ref.addend());
    break;
  }
  case R_X86_64_TLSLD: {
    // Rewrite to move %fs:0 into %rax. Technically we should verify that the
    // next relocation is a PC32 to __tls_get_addr...
    static uint8_t instr[] = { 0x66, 0x66, 0x66, 0x64, 0x48, 0x8b, 0x04, 0x25,
                               0x00, 0x00, 0x00, 0x00 };
    std::memcpy(loc - 3, instr, sizeof(instr));
    break;
  }
  case R_X86_64_PC64:
    relocPC64(loc, reloc, target, ref.addend());
    break;
  case LLD_R_X86_64_GOTRELINDEX: {
    const DefinedAtom *target = cast<const DefinedAtom>(ref.target());
    for (const Reference *r : *target) {
      if (r->kindValue() == R_X86_64_JUMP_SLOT) {
        uint32_t index;
        if (!_layout.getPLTRelocationTable()->getRelocationIndex(*r, index))
          llvm_unreachable("Relocation doesn't exist");
        reloc32(loc, 0, index, 0);
        break;
      }
    }
    break;
  }
  // Runtime only relocations. Ignore here.
  case R_X86_64_RELATIVE:
  case R_X86_64_IRELATIVE:
  case R_X86_64_JUMP_SLOT:
  case R_X86_64_GLOB_DAT:
  case R_X86_64_DTPMOD64:
  case R_X86_64_DTPOFF64:
    break;
  default:
    return make_unhandled_reloc_error();
  }

  return std::error_code();
}