コード例 #1
0
// R_386_32: S + A
X86RelocationFactory::Result abs32(Relocation& pReloc,
                                   const MCLDInfo& pLDInfo,
                                   X86RelocationFactory& pParent)
{
  ResolveInfo* rsym = pReloc.symInfo();
  RelocationFactory::DWord A = pReloc.target() + pReloc.addend();
  RelocationFactory::DWord S = pReloc.symValue();
  bool has_dyn_rel = pParent.getTarget().symbolNeedsDynRel(
                       *rsym, (rsym->reserved() & X86GNULDBackend::ReservePLT),
                       pLDInfo, pLDInfo.output(), true);

  const LDSection* target_sect = pParent.getLayout().getOutputLDSection(
                                                  *(pReloc.targetRef().frag()));
  assert(NULL != target_sect);
  // If the flag of target section is not ALLOC, we will not scan this relocation
  // but perform static relocation. (e.g., applying .debug section)
  if (0x0 == (llvm::ELF::SHF_ALLOC & target_sect->flag())) {
    pReloc.target() = S + A;
    return X86RelocationFactory::OK;
  }

  // A local symbol may need REL Type dynamic relocation
  if (rsym->isLocal() && has_dyn_rel) {
    helper_DynRel(pReloc, llvm::ELF::R_386_RELATIVE, pParent);
    pReloc.target() = S + A;
    return X86RelocationFactory::OK;
  }

  // An external symbol may need PLT and dynamic relocation
  if (!rsym->isLocal()) {
    if (rsym->reserved() & X86GNULDBackend::ReservePLT) {
      S = helper_PLT(pReloc, pParent);
      pReloc.target() = S + A;
    }
    // If we generate a dynamic relocation (except R_386_RELATIVE)
    // for a place, we should not perform static relocation on it
    // in order to keep the addend store in the place correct.
    if (has_dyn_rel) {
      if (helper_use_relative_reloc(*rsym, pLDInfo, pParent)) {
        helper_DynRel(pReloc, llvm::ELF::R_386_RELATIVE, pParent);
      }
      else {
        helper_DynRel(pReloc, pReloc.type(), pParent);
        return X86RelocationFactory::OK;
      }
    }
  }

  // perform static relocation
  pReloc.target() = S + A;
  return X86RelocationFactory::OK;
}
コード例 #2
0
// Check if symbol can use relocation R_386_RELATIVE
static bool
helper_use_relative_reloc(const ResolveInfo& pSym,
                          const MCLDInfo& pLDInfo,
                          const X86RelocationFactory& pFactory)

{
  // if symbol is dynamic or undefine or preemptible
  if(pSym.isDyn() ||
     pSym.isUndef() ||
     pFactory.getTarget().isSymbolPreemptible(pSym, pLDInfo, pLDInfo.output()))
    return false;
  return true;
}
コード例 #3
0
bool ARMGNULDBackend::isSymbolPreemptible(const ResolveInfo& pSym,
                                          const MCLDInfo& pLDInfo,
                                          const Output& pOutput) const
{
  if(pSym.other() != ResolveInfo::Default)
    return false;

  if(Output::DynObj != pOutput.type())
    return false;

  if(pLDInfo.options().Bsymbolic())
    return false;

  return true;
}
コード例 #4
0
// R_386_PC32: S + A - P
X86RelocationFactory::Result rel32(Relocation& pReloc,
                                   const MCLDInfo& pLDInfo,
                                   X86RelocationFactory& pParent)
{
  ResolveInfo* rsym = pReloc.symInfo();
  RelocationFactory::DWord A = pReloc.target() + pReloc.addend();
  RelocationFactory::DWord S = pReloc.symValue();
  RelocationFactory::DWord P = pReloc.place(pParent.getLayout());

  const LDSection* target_sect = pParent.getLayout().getOutputLDSection(
                                                  *(pReloc.targetRef().frag()));
  assert(NULL != target_sect);
  // If the flag of target section is not ALLOC, we will not scan this relocation
  // but perform static relocation. (e.g., applying .debug section)
  if (0x0 == (llvm::ELF::SHF_ALLOC & target_sect->flag())) {
    pReloc.target() = S + A - P;
    return X86RelocationFactory::OK;
  }

  // An external symbol may need PLT and dynamic relocation
  if (!rsym->isLocal()) {
    if (rsym->reserved() & X86GNULDBackend::ReservePLT) {
       S = helper_PLT(pReloc, pParent);
       pReloc.target() = S + A - P;
    }
    if (pParent.getTarget().symbolNeedsDynRel(
          *rsym, (rsym->reserved() & X86GNULDBackend::ReservePLT), pLDInfo,
                  pLDInfo.output(), false)) {
      if (helper_use_relative_reloc(*rsym, pLDInfo, pParent) ) {
        helper_DynRel(pReloc, llvm::ELF::R_386_RELATIVE, pParent);
      }
      else {
        helper_DynRel(pReloc, pReloc.type(), pParent);
          return X86RelocationFactory::OK;
      }
    }
  }

   // perform static relocation
  pReloc.target() = S + A - P;
  return X86RelocationFactory::OK;
}