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/MCContext.h"
16#include "llvm/MC/MCELFStreamer.h"
17#include "llvm/MC/MCSectionELF.h"
18#include "llvm/MC/MCStreamer.h"
19#include "llvm/MC/MCSubtargetInfo.h"
20
21using namespace llvm;
22
23namespace llvm {
24
25class MSP430TargetELFStreamer : public MCTargetStreamer {
26public:
27  MCELFStreamer &getStreamer();
28  MSP430TargetELFStreamer(MCStreamer &S, const MCSubtargetInfo &STI);
29};
30
31// This part is for ELF object output.
32MSP430TargetELFStreamer::MSP430TargetELFStreamer(MCStreamer &S,
33                                                 const MCSubtargetInfo &STI)
34    : MCTargetStreamer(S) {
35  MCAssembler &MCA = getStreamer().getAssembler();
36  unsigned EFlags = MCA.getELFHeaderEFlags();
37  MCA.setELFHeaderEFlags(EFlags);
38
39  // Emit build attributes section according to
40  // MSP430 EABI (slaa534.pdf, part 13).
41  MCSection *AttributeSection = getStreamer().getContext().getELFSection(
42      ".MSP430.attributes", ELF::SHT_MSP430_ATTRIBUTES, 0);
43  Streamer.SwitchSection(AttributeSection);
44
45  // Format version.
46  Streamer.EmitIntValue(0x41, 1);
47  // Subsection length.
48  Streamer.EmitIntValue(22, 4);
49  // Vendor name string, zero-terminated.
50  Streamer.EmitBytes("mspabi");
51  Streamer.EmitIntValue(0, 1);
52
53  // Attribute vector scope tag. 1 stands for the entire file.
54  Streamer.EmitIntValue(1, 1);
55  // Attribute vector length.
56  Streamer.EmitIntValue(11, 4);
57  // OFBA_MSPABI_Tag_ISA(4) = 1, MSP430
58  Streamer.EmitIntValue(4, 1);
59  Streamer.EmitIntValue(1, 1);
60  // OFBA_MSPABI_Tag_Code_Model(6) = 1, Small
61  Streamer.EmitIntValue(6, 1);
62  Streamer.EmitIntValue(1, 1);
63  // OFBA_MSPABI_Tag_Data_Model(8) = 1, Small
64  Streamer.EmitIntValue(8, 1);
65  Streamer.EmitIntValue(1, 1);
66}
67
68MCELFStreamer &MSP430TargetELFStreamer::getStreamer() {
69  return static_cast<MCELFStreamer &>(Streamer);
70}
71
72MCTargetStreamer *
73createMSP430ObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
74  const Triple &TT = STI.getTargetTriple();
75  if (TT.isOSBinFormatELF())
76    return new MSP430TargetELFStreamer(S, STI);
77  return nullptr;
78}
79
80} // namespace llvm
81