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 21 using namespace llvm; 22 23 namespace llvm { 24 25 class MSP430TargetELFStreamer : public MCTargetStreamer { 26 public: 27 MCELFStreamer &getStreamer(); 28 MSP430TargetELFStreamer(MCStreamer &S, const MCSubtargetInfo &STI); 29 }; 30 31 // This part is for ELF object output. 32 MSP430TargetELFStreamer::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.emitInt8(0x41); 47 // Subsection length. 48 Streamer.emitInt32(22); 49 // Vendor name string, zero-terminated. 50 Streamer.emitBytes("mspabi"); 51 Streamer.emitInt8(0); 52 53 // Attribute vector scope tag. 1 stands for the entire file. 54 Streamer.emitInt8(1); 55 // Attribute vector length. 56 Streamer.emitInt32(11); 57 // OFBA_MSPABI_Tag_ISA(4) = 1, MSP430 58 Streamer.emitInt8(4); 59 Streamer.emitInt8(1); 60 // OFBA_MSPABI_Tag_Code_Model(6) = 1, Small 61 Streamer.emitInt8(6); 62 Streamer.emitInt8(1); 63 // OFBA_MSPABI_Tag_Data_Model(8) = 1, Small 64 Streamer.emitInt8(8); 65 Streamer.emitInt8(1); 66 } 67 68 MCELFStreamer &MSP430TargetELFStreamer::getStreamer() { 69 return static_cast<MCELFStreamer &>(Streamer); 70 } 71 72 MCTargetStreamer * 73 createMSP430ObjectTargetStreamer(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