1 //===-- LoongArchELFStreamer.cpp - LoongArch 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 LoongArch specific target streamer methods. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "LoongArchELFStreamer.h" 14 #include "LoongArchAsmBackend.h" 15 #include "llvm/BinaryFormat/ELF.h" 16 #include "llvm/MC/MCAssembler.h" 17 #include "llvm/MC/MCCodeEmitter.h" 18 #include "llvm/MC/MCObjectWriter.h" 19 20 using namespace llvm; 21 22 // This part is for ELF object output. 23 LoongArchTargetELFStreamer::LoongArchTargetELFStreamer( 24 MCStreamer &S, const MCSubtargetInfo &STI) 25 : LoongArchTargetStreamer(S) { 26 // FIXME: select appropriate ABI. 27 setTargetABI(STI.getTargetTriple().isArch64Bit() ? LoongArchABI::ABI_LP64D 28 : LoongArchABI::ABI_ILP32D); 29 } 30 31 MCELFStreamer &LoongArchTargetELFStreamer::getStreamer() { 32 return static_cast<MCELFStreamer &>(Streamer); 33 } 34 35 void LoongArchTargetELFStreamer::finish() { 36 LoongArchTargetStreamer::finish(); 37 MCAssembler &MCA = getStreamer().getAssembler(); 38 LoongArchABI::ABI ABI = getTargetABI(); 39 40 // Figure out the e_flags. 41 // 42 // Bitness is already represented with the EI_CLASS byte in the current spec, 43 // so here we only record the base ABI modifier. Also set the object file ABI 44 // version to v1, as upstream LLVM cannot handle the previous stack-machine- 45 // based relocs from day one. 46 // 47 // Refer to LoongArch ELF psABI v2.01 for details. 48 unsigned EFlags = MCA.getELFHeaderEFlags(); 49 EFlags |= ELF::EF_LOONGARCH_OBJABI_V1; 50 switch (ABI) { 51 case LoongArchABI::ABI_ILP32S: 52 case LoongArchABI::ABI_LP64S: 53 EFlags |= ELF::EF_LOONGARCH_ABI_SOFT_FLOAT; 54 break; 55 case LoongArchABI::ABI_ILP32F: 56 case LoongArchABI::ABI_LP64F: 57 EFlags |= ELF::EF_LOONGARCH_ABI_SINGLE_FLOAT; 58 break; 59 case LoongArchABI::ABI_ILP32D: 60 case LoongArchABI::ABI_LP64D: 61 EFlags |= ELF::EF_LOONGARCH_ABI_DOUBLE_FLOAT; 62 break; 63 case LoongArchABI::ABI_Unknown: 64 llvm_unreachable("Improperly initialized target ABI"); 65 } 66 MCA.setELFHeaderEFlags(EFlags); 67 } 68 69 namespace { 70 class LoongArchELFStreamer : public MCELFStreamer { 71 public: 72 LoongArchELFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> MAB, 73 std::unique_ptr<MCObjectWriter> MOW, 74 std::unique_ptr<MCCodeEmitter> MCE) 75 : MCELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE)) {} 76 }; 77 } // end namespace 78 79 namespace llvm { 80 MCELFStreamer *createLoongArchELFStreamer(MCContext &C, 81 std::unique_ptr<MCAsmBackend> MAB, 82 std::unique_ptr<MCObjectWriter> MOW, 83 std::unique_ptr<MCCodeEmitter> MCE, 84 bool RelaxAll) { 85 LoongArchELFStreamer *S = new LoongArchELFStreamer( 86 C, std::move(MAB), std::move(MOW), std::move(MCE)); 87 S->getAssembler().setRelaxAll(RelaxAll); 88 return S; 89 } 90 } // end namespace llvm 91