1//===-- MSP430ELFStreamer.cpp - MSP430 ELF Target Streamer Methods --------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file provides MSP430 specific target streamer methods.
10//
11//===----------------------------------------------------------------------===//
12
13#include "MSP430MCTargetDesc.h"
14#include "llvm/BinaryFormat/ELF.h"
15#include "llvm/MC/MCAssembler.h"
16#include "llvm/MC/MCContext.h"
17#include "llvm/MC/MCELFStreamer.h"
18#include "llvm/MC/MCSectionELF.h"
19#include "llvm/MC/MCStreamer.h"
20#include "llvm/MC/MCSubtargetInfo.h"
21#include "llvm/Support/MSP430Attributes.h"
22
23using namespace llvm;
24using namespace llvm::MSP430Attrs;
25
26namespace llvm {
27
28class MSP430TargetELFStreamer : public MCTargetStreamer {
29public:
30  MCELFStreamer &getStreamer();
31  MSP430TargetELFStreamer(MCStreamer &S, const MCSubtargetInfo &STI);
32};
33
34// This part is for ELF object output.
35MSP430TargetELFStreamer::MSP430TargetELFStreamer(MCStreamer &S,
36                                                 const MCSubtargetInfo &STI)
37    : MCTargetStreamer(S) {
38  MCAssembler &MCA = getStreamer().getAssembler();
39  unsigned EFlags = MCA.getELFHeaderEFlags();
40  MCA.setELFHeaderEFlags(EFlags);
41
42  // Emit build attributes section according to
43  // MSP430 EABI (slaa534.pdf, part 13).
44  MCSection *AttributeSection = getStreamer().getContext().getELFSection(
45      ".MSP430.attributes", ELF::SHT_MSP430_ATTRIBUTES, 0);
46  Streamer.switchSection(AttributeSection);
47
48  // Format version.
49  Streamer.emitInt8(0x41);
50  // Subsection length.
51  Streamer.emitInt32(22);
52  // Vendor name string, zero-terminated.
53  Streamer.emitBytes("mspabi");
54  Streamer.emitInt8(0);
55
56  // Attribute vector scope tag. 1 stands for the entire file.
57  Streamer.emitInt8(1);
58  // Attribute vector length.
59  Streamer.emitInt32(11);
60
61  Streamer.emitInt8(TagISA);
62  Streamer.emitInt8(STI.hasFeature(MSP430::FeatureX) ? ISAMSP430X : ISAMSP430);
63  Streamer.emitInt8(TagCodeModel);
64  Streamer.emitInt8(CMSmall);
65  Streamer.emitInt8(TagDataModel);
66  Streamer.emitInt8(DMSmall);
67  // Don't emit TagEnumSize, for full GCC compatibility.
68}
69
70MCELFStreamer &MSP430TargetELFStreamer::getStreamer() {
71  return static_cast<MCELFStreamer &>(Streamer);
72}
73
74MCTargetStreamer *
75createMSP430ObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
76  const Triple &TT = STI.getTargetTriple();
77  if (TT.isOSBinFormatELF())
78    return new MSP430TargetELFStreamer(S, STI);
79  return nullptr;
80}
81
82} // namespace llvm
83