MipsEmulation.cpp revision f33f6de54db174aa679a4b6d1e040d37e95541c0 
1//===- MipsEmulation.cpp --------------------------------------------------===//
2//
3//                     The MCLinker Project
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9#include "Mips.h"
10#include <mcld/LinkerScript.h>
11#include <mcld/LinkerConfig.h>
12#include <mcld/Target/ELFEmulation.h>
13#include <mcld/Support/TargetRegistry.h>
14
15namespace mcld {
16
17static bool MCLDEmulateMipsELF(LinkerScript& pScript, LinkerConfig& pConfig)
18{
19  if (!MCLDEmulateELF(pScript, pConfig))
20    return false;
21
22  // set up bitclass and endian
23  pConfig.targets().setEndian(TargetOptions::Little);
24
25  llvm::Triple::ArchType arch = pConfig.targets().triple().getArch();
26  assert(arch == llvm::Triple::mipsel || arch == llvm::Triple::mips64el);
27  unsigned bitclass = arch == llvm::Triple::mipsel ? 32 : 64;
28  pConfig.targets().setBitClass(bitclass);
29
30  // set up target-dependent constraints of attributes
31  pConfig.attribute().constraint().enableWholeArchive();
32  pConfig.attribute().constraint().enableAsNeeded();
33  pConfig.attribute().constraint().setSharedSystem();
34
35  // set up the predefined attributes
36  pConfig.attribute().predefined().unsetWholeArchive();
37  pConfig.attribute().predefined().unsetAsNeeded();
38  pConfig.attribute().predefined().setDynamic();
39  return true;
40}
41
42//===----------------------------------------------------------------------===//
43// emulateMipsLD - the help function to emulate Mips ld
44//===----------------------------------------------------------------------===//
45bool emulateMipsLD(LinkerScript& pScript, LinkerConfig& pConfig)
46{
47  if (pConfig.targets().triple().isOSDarwin()) {
48    assert(0 && "MachO linker has not supported yet");
49    return false;
50  }
51  if (pConfig.targets().triple().isOSWindows()) {
52    assert(0 && "COFF linker has not supported yet");
53    return false;
54  }
55
56  return MCLDEmulateMipsELF(pScript, pConfig);
57}
58
59} // namespace of mcld
60
61//===----------------------------------------------------------------------===//
62// MipsEmulation
63//===----------------------------------------------------------------------===//
64extern "C" void MCLDInitializeMipsEmulation() {
65  mcld::TargetRegistry::RegisterEmulation(mcld::TheMipselTarget,
66                                          mcld::emulateMipsLD);
67  mcld::TargetRegistry::RegisterEmulation(mcld::TheMips64elTarget,
68                                          mcld::emulateMipsLD);
69}
70