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 // Emit build attributes section according to
39 // MSP430 EABI (slaa534.pdf, part 13).
40 MCSection *AttributeSection = getStreamer().getContext().getELFSection(
41 Section: ".MSP430.attributes", Type: ELF::SHT_MSP430_ATTRIBUTES, Flags: 0);
42 Streamer.switchSection(Section: AttributeSection);
43
44 // Format version.
45 Streamer.emitInt8(Value: 0x41);
46 // Subsection length.
47 Streamer.emitInt32(Value: 22);
48 // Vendor name string, zero-terminated.
49 Streamer.emitBytes(Data: "mspabi");
50 Streamer.emitInt8(Value: 0);
51
52 // Attribute vector scope tag. 1 stands for the entire file.
53 Streamer.emitInt8(Value: 1);
54 // Attribute vector length.
55 Streamer.emitInt32(Value: 11);
56
57 Streamer.emitInt8(Value: TagISA);
58 Streamer.emitInt8(Value: STI.hasFeature(Feature: MSP430::FeatureX) ? ISAMSP430X : ISAMSP430);
59 Streamer.emitInt8(Value: TagCodeModel);
60 Streamer.emitInt8(Value: CMSmall);
61 Streamer.emitInt8(Value: TagDataModel);
62 Streamer.emitInt8(Value: DMSmall);
63 // Don't emit TagEnumSize, for full GCC compatibility.
64}
65
66MCELFStreamer &MSP430TargetELFStreamer::getStreamer() {
67 return static_cast<MCELFStreamer &>(Streamer);
68}
69
70MCTargetStreamer *
71createMSP430ObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
72 const Triple &TT = STI.getTargetTriple();
73 if (TT.isOSBinFormatELF())
74 return new MSP430TargetELFStreamer(S, STI);
75 return nullptr;
76}
77
78} // namespace llvm
79