81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
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//===-- MSP430ELFStreamer.cpp - MSP430 ELF Target Streamer Methods --------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides MSP430 specific target streamer methods.
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//
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//===----------------------------------------------------------------------===//
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#include "MSP430MCTargetDesc.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCELFStreamer.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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using namespace llvm;
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namespace llvm {
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class MSP430TargetELFStreamer : public MCTargetStreamer {
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public:
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MCELFStreamer &getStreamer();
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MSP430TargetELFStreamer(MCStreamer &S, const MCSubtargetInfo &STI);
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};
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// This part is for ELF object output.
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MSP430TargetELFStreamer::MSP430TargetELFStreamer(MCStreamer &S,
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const MCSubtargetInfo &STI)
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: MCTargetStreamer(S) {
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MCAssembler &MCA = getStreamer().getAssembler();
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unsigned EFlags = MCA.getELFHeaderEFlags();
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MCA.setELFHeaderEFlags(EFlags);
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// Emit build attributes section according to
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// MSP430 EABI (slaa534.pdf, part 13).
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MCSection *AttributeSection = getStreamer().getContext().getELFSection(
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".MSP430.attributes", ELF::SHT_MSP430_ATTRIBUTES, 0);
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Streamer.SwitchSection(AttributeSection);
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// Format version.
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Streamer.emitInt8(0x41);
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// Subsection length.
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Streamer.emitInt32(22);
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// Vendor name string, zero-terminated.
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Streamer.emitBytes("mspabi");
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Streamer.emitInt8(0);
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// Attribute vector scope tag. 1 stands for the entire file.
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Streamer.emitInt8(1);
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// Attribute vector length.
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Streamer.emitInt32(11);
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// OFBA_MSPABI_Tag_ISA(4) = 1, MSP430
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Streamer.emitInt8(4);
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Streamer.emitInt8(1);
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// OFBA_MSPABI_Tag_Code_Model(6) = 1, Small
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Streamer.emitInt8(6);
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Streamer.emitInt8(1);
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// OFBA_MSPABI_Tag_Data_Model(8) = 1, Small
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Streamer.emitInt8(8);
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Streamer.emitInt8(1);
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}
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MCELFStreamer &MSP430TargetELFStreamer::getStreamer() {
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return static_cast<MCELFStreamer &>(Streamer);
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}
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MCTargetStreamer *
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createMSP430ObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
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const Triple &TT = STI.getTargetTriple();
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if (TT.isOSBinFormatELF())
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return new MSP430TargetELFStreamer(S, STI);
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return nullptr;
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}
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} // namespace llvm
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