lib/Target/ARM/ARMEmulation.cpp

//===- ARMEmulation.cpp ---------------------------------------------------===//
//
//                     The MCLinker Project
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ARM.h"
#include "mcld/LinkerConfig.h"
#include "mcld/LinkerScript.h"
#include "mcld/Target/ELFEmulation.h"
#include "mcld/Support/TargetRegistry.h"

namespace mcld {

static bool MCLDEmulateARMELF(LinkerScript& pScript, LinkerConfig& pConfig) {
  if (!MCLDEmulateELF(pScript, pConfig))
    return false;

  // set up bitclass and endian
  pConfig.targets().setEndian(TargetOptions::Little);
  pConfig.targets().setBitClass(32);

  // set up target-dependent constraints of attributes
  pConfig.attribute().constraint().enableWholeArchive();
  pConfig.attribute().constraint().enableAsNeeded();
  pConfig.attribute().constraint().setSharedSystem();

  // set up the predefined attributes
  pConfig.attribute().predefined().unsetWholeArchive();
  pConfig.attribute().predefined().unsetAsNeeded();
  pConfig.attribute().predefined().setDynamic();

  // set up section map
  if (pConfig.options().getScriptList().empty() &&
      pConfig.codeGenType() != LinkerConfig::Object) {
    pScript.sectionMap().insert(".ARM.exidx*", ".ARM.exidx");
    pScript.sectionMap().insert(".ARM.extab*", ".ARM.extab");
    pScript.sectionMap().insert(".ARM.attributes*", ".ARM.attributes");
  }
  return true;
}

//===----------------------------------------------------------------------===//
// emulateARMLD - the help function to emulate ARM ld
//===----------------------------------------------------------------------===//
bool emulateARMLD(LinkerScript& pScript, LinkerConfig& pConfig) {
  if (pConfig.targets().triple().isOSDarwin()) {
    assert(0 && "MachO linker has not supported yet");
    return false;
  }
  if (pConfig.targets().triple().isOSWindows()) {
    assert(0 && "COFF linker has not supported yet");
    return false;
  }

  return MCLDEmulateARMELF(pScript, pConfig);
}

}  // namespace mcld

//===----------------------------------------------------------------------===//
// ARMEmulation
//===----------------------------------------------------------------------===//
extern "C" void MCLDInitializeARMEmulation() {
  // Register the emulation
  mcld::TargetRegistry::RegisterEmulation(mcld::TheARMTarget,
                                          mcld::emulateARMLD);
  mcld::TargetRegistry::RegisterEmulation(mcld::TheThumbTarget,
                                          mcld::emulateARMLD);
}