MipsEmulation.cpp revision 37b74a387bb3993387029859c2d9d051c41c724e 
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/Support/TargetRegistry.h"
13#include "mcld/Target/ELFEmulation.h"
14
15namespace mcld {
16
17static bool MCLDEmulateMipsELF(LinkerScript& pScript, LinkerConfig& pConfig) {
18  if (!MCLDEmulateELF(pScript, pConfig))
19    return false;
20
21  // set up bitclass and endian
22  pConfig.targets().setEndian(TargetOptions::Little);
23
24  llvm::Triple::ArchType arch = pConfig.targets().triple().getArch();
25  assert(arch == llvm::Triple::mipsel || arch == llvm::Triple::mips64el);
26  unsigned bitclass = arch == llvm::Triple::mipsel ? 32 : 64;
27  pConfig.targets().setBitClass(bitclass);
28
29  // set up target-dependent constraints of attributes
30  pConfig.attribute().constraint().enableWholeArchive();
31  pConfig.attribute().constraint().enableAsNeeded();
32  pConfig.attribute().constraint().setSharedSystem();
33
34  // set up the predefined attributes
35  pConfig.attribute().predefined().unsetWholeArchive();
36  pConfig.attribute().predefined().unsetAsNeeded();
37  pConfig.attribute().predefined().setDynamic();
38  return true;
39}
40
41//===----------------------------------------------------------------------===//
42// emulateMipsLD - the help function to emulate Mips ld
43//===----------------------------------------------------------------------===//
44bool emulateMipsLD(LinkerScript& pScript, LinkerConfig& pConfig) {
45  if (pConfig.targets().triple().isOSDarwin()) {
46    assert(0 && "MachO linker has not supported yet");
47    return false;
48  }
49  if (pConfig.targets().triple().isOSWindows()) {
50    assert(0 && "COFF linker has not supported yet");
51    return false;
52  }
53
54  return MCLDEmulateMipsELF(pScript, pConfig);
55}
56
57}  // namespace mcld
58
59//===----------------------------------------------------------------------===//
60// MipsEmulation
61//===----------------------------------------------------------------------===//
62extern "C" void MCLDInitializeMipsEmulation() {
63  mcld::TargetRegistry::RegisterEmulation(mcld::TheMipselTarget,
64                                          mcld::emulateMipsLD);
65  mcld::TargetRegistry::RegisterEmulation(mcld::TheMips64elTarget,
66                                          mcld::emulateMipsLD);
67}
68