MSP430ELFStreamer.cpp
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//===-- MSP430ELFStreamer.cpp - MSP430 ELF Target Streamer Methods --------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides MSP430 specific target streamer methods.
//
//===----------------------------------------------------------------------===//
#include "MSP430MCTargetDesc.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFStreamer.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
using namespace llvm;
namespace llvm {
class MSP430TargetELFStreamer : public MCTargetStreamer {
public:
MCELFStreamer &getStreamer();
MSP430TargetELFStreamer(MCStreamer &S, const MCSubtargetInfo &STI);
};
// This part is for ELF object output.
MSP430TargetELFStreamer::MSP430TargetELFStreamer(MCStreamer &S,
const MCSubtargetInfo &STI)
: MCTargetStreamer(S) {
MCAssembler &MCA = getStreamer().getAssembler();
unsigned EFlags = MCA.getELFHeaderEFlags();
MCA.setELFHeaderEFlags(EFlags);
// Emit build attributes section according to
// MSP430 EABI (slaa534.pdf, part 13).
MCSection *AttributeSection = getStreamer().getContext().getELFSection(
".MSP430.attributes", ELF::SHT_MSP430_ATTRIBUTES, 0);
Streamer.SwitchSection(AttributeSection);
// Format version.
Streamer.EmitIntValue(0x41, 1);
// Subsection length.
Streamer.EmitIntValue(22, 4);
// Vendor name string, zero-terminated.
Streamer.EmitBytes("mspabi");
Streamer.EmitIntValue(0, 1);
// Attribute vector scope tag. 1 stands for the entire file.
Streamer.EmitIntValue(1, 1);
// Attribute vector length.
Streamer.EmitIntValue(11, 4);
// OFBA_MSPABI_Tag_ISA(4) = 1, MSP430
Streamer.EmitIntValue(4, 1);
Streamer.EmitIntValue(1, 1);
// OFBA_MSPABI_Tag_Code_Model(6) = 1, Small
Streamer.EmitIntValue(6, 1);
Streamer.EmitIntValue(1, 1);
// OFBA_MSPABI_Tag_Data_Model(8) = 1, Small
Streamer.EmitIntValue(8, 1);
Streamer.EmitIntValue(1, 1);
}
MCELFStreamer &MSP430TargetELFStreamer::getStreamer() {
return static_cast<MCELFStreamer &>(Streamer);
}
MCTargetStreamer *
createMSP430ObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
const Triple &TT = STI.getTargetTriple();
if (TT.isOSBinFormatELF())
return new MSP430TargetELFStreamer(S, STI);
return nullptr;
}
} // namespace llvm