X86Emulation.cpp revision 87f34658dec9097d987d254a990ea7f311bfc95f 
1//===- X86Emulation.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 "X86.h"
10#include <mcld/LinkerConfig.h>
11#include <mcld/LinkerScript.h>
12#include <mcld/Target/ELFEmulation.h>
13#include <mcld/Support/TargetRegistry.h>
14
15namespace mcld {
16
17static bool MCLDEmulateX86ELF(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  unsigned int bitclass;
25  llvm::Triple::ArchType arch = pConfig.targets().triple().getArch();
26  assert (arch == llvm::Triple::x86 || arch == llvm::Triple::x86_64);
27  if (arch == llvm::Triple::x86 ||
28      pConfig.targets().triple().getEnvironment() == llvm::Triple::GNUX32) {
29    bitclass = 32;
30  }
31  else {
32    bitclass = 64;
33  }
34  pConfig.targets().setBitClass(bitclass);
35
36  // set up target-dependent constraints of attributes
37  pConfig.attribute().constraint().enableWholeArchive();
38  pConfig.attribute().constraint().enableAsNeeded();
39  pConfig.attribute().constraint().setSharedSystem();
40
41  // set up the predefined attributes
42  pConfig.attribute().predefined().unsetWholeArchive();
43  pConfig.attribute().predefined().unsetAsNeeded();
44  pConfig.attribute().predefined().setDynamic();
45  return true;
46}
47
48//===----------------------------------------------------------------------===//
49// emulateX86LD - the help function to emulate X86 ld
50//===----------------------------------------------------------------------===//
51bool emulateX86LD(LinkerScript& pScript, LinkerConfig& pConfig)
52{
53  if (pConfig.targets().triple().isOSDarwin()) {
54    assert(0 && "MachO linker has not supported yet");
55    return false;
56  }
57  if (pConfig.targets().triple().isOSWindows()) {
58    assert(0 && "COFF linker has not supported yet");
59    return false;
60  }
61
62  return MCLDEmulateX86ELF(pScript, pConfig);
63}
64
65} // namespace of mcld
66
67//===----------------------------------------------------------------------===//
68// X86Emulation
69//===----------------------------------------------------------------------===//
70extern "C" void MCLDInitializeX86Emulation() {
71  // Register the emulation
72  mcld::TargetRegistry::RegisterEmulation(mcld::TheX86_32Target, mcld::emulateX86LD);
73  mcld::TargetRegistry::RegisterEmulation(mcld::TheX86_64Target, mcld::emulateX86LD);
74}
75
76