| //===-- CSKYMCCodeEmitter.cpp - CSKY Code Emitter interface ---------------===// |
| // |
| // 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 implements the CSKYMCCodeEmitter class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "CSKYMCAsmInfo.h" |
| #include "MCTargetDesc/CSKYFixupKinds.h" |
| #include "MCTargetDesc/CSKYMCAsmInfo.h" |
| #include "MCTargetDesc/CSKYMCTargetDesc.h" |
| #include "llvm/ADT/Statistic.h" |
| #include "llvm/MC/MCCodeEmitter.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCInstBuilder.h" |
| #include "llvm/MC/MCInstrInfo.h" |
| #include "llvm/MC/MCRegisterInfo.h" |
| #include "llvm/MC/MCSubtargetInfo.h" |
| #include "llvm/Support/Casting.h" |
| #include "llvm/Support/EndianStream.h" |
| |
| using namespace llvm; |
| |
| #define DEBUG_TYPE "csky-mccode-emitter" |
| |
| STATISTIC(MCNumEmitted, "Number of MC instructions emitted"); |
| |
| static void addFixup(SmallVectorImpl<MCFixup> &Fixups, uint32_t Offset, |
| const MCExpr *Value, uint16_t Kind) { |
| bool PCRel = false; |
| switch (Kind) { |
| case CSKY::Fixups::fixup_csky_pcrel_imm16_scale2: |
| case CSKY::Fixups::fixup_csky_pcrel_uimm16_scale4: |
| case CSKY::Fixups::fixup_csky_pcrel_imm26_scale2: |
| case CSKY::Fixups::fixup_csky_pcrel_imm18_scale2: |
| case CSKY::Fixups::fixup_csky_gotpc: |
| case CSKY::Fixups::fixup_csky_pcrel_imm10_scale2: |
| case CSKY::Fixups::fixup_csky_pcrel_uimm7_scale4: |
| case CSKY::Fixups::fixup_csky_pcrel_uimm8_scale4: |
| PCRel = true; |
| } |
| Fixups.push_back(MCFixup::create(Offset, Value, Kind, PCRel)); |
| } |
| |
| namespace { |
| class CSKYMCCodeEmitter : public MCCodeEmitter { |
| MCContext &Ctx; |
| const MCInstrInfo &MII; |
| |
| public: |
| CSKYMCCodeEmitter(MCContext &Ctx, const MCInstrInfo &MII) |
| : Ctx(Ctx), MII(MII) {} |
| |
| ~CSKYMCCodeEmitter() {} |
| |
| void encodeInstruction(const MCInst &Inst, SmallVectorImpl<char> &CB, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const override; |
| |
| // Generated by tablegen. |
| uint64_t getBinaryCodeForInstr(const MCInst &MI, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| // Default encoding method used by tablegen. |
| unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| template <int shift = 0> |
| unsigned getImmOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(Idx); |
| if (MO.isImm()) |
| return (MO.getImm() >> shift); |
| |
| assert(MO.isExpr() && "Unexpected MO type."); |
| |
| MCFixupKind Kind = getTargetFixup(MO.getExpr()); |
| addFixup(Fixups, 0, MO.getExpr(), Kind); |
| return 0; |
| } |
| |
| unsigned getRegSeqImmOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| unsigned getRegisterSeqOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| unsigned getOImmOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| unsigned getImmOpValueIDLY(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| unsigned getImmJMPIX(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| unsigned getImmOpValueMSBSize(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| unsigned getImmShiftOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(Idx); |
| assert(MO.isImm() && "Unexpected MO type."); |
| return 1 << MO.getImm(); |
| } |
| |
| MCFixupKind getTargetFixup(const MCExpr *Expr) const; |
| |
| template <llvm::CSKY::Fixups FIXUP> |
| unsigned getBranchSymbolOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(Idx); |
| |
| if (MO.isImm()) |
| return MO.getImm() >> 1; |
| |
| assert(MO.isExpr() && "Unexpected MO type."); |
| |
| MCFixupKind Kind = MCFixupKind(FIXUP); |
| if (MO.getExpr()->getKind() == MCExpr::Specifier) |
| Kind = getTargetFixup(MO.getExpr()); |
| |
| addFixup(Fixups, 0, MO.getExpr(), Kind); |
| return 0; |
| } |
| |
| template <llvm::CSKY::Fixups FIXUP> |
| unsigned getConstpoolSymbolOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(Idx); |
| assert(MO.isExpr() && "Unexpected MO type."); |
| |
| MCFixupKind Kind = MCFixupKind(FIXUP); |
| if (MO.getExpr()->getKind() == MCExpr::Specifier) |
| Kind = getTargetFixup(MO.getExpr()); |
| |
| addFixup(Fixups, 0, MO.getExpr(), Kind); |
| return 0; |
| } |
| |
| template <llvm::CSKY::Fixups FIXUP> |
| unsigned getDataSymbolOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(Idx); |
| assert(MO.isExpr() && "Unexpected MO type."); |
| |
| MCFixupKind Kind = MCFixupKind(FIXUP); |
| if (MO.getExpr()->getKind() == MCExpr::Specifier) |
| Kind = getTargetFixup(MO.getExpr()); |
| |
| addFixup(Fixups, 0, MO.getExpr(), Kind); |
| return 0; |
| } |
| |
| unsigned getCallSymbolOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(Idx); |
| assert(MO.isExpr() && "Unexpected MO type."); |
| |
| MCFixupKind Kind = CSKY::fixup_csky_pcrel_imm26_scale2; |
| if (MO.getExpr()->getKind() == MCExpr::Specifier) |
| Kind = getTargetFixup(MO.getExpr()); |
| |
| addFixup(Fixups, 0, MO.getExpr(), Kind); |
| return 0; |
| } |
| |
| unsigned getBareSymbolOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(Idx); |
| assert(MO.isExpr() && "Unexpected MO type."); |
| |
| MCFixupKind Kind = CSKY::fixup_csky_pcrel_imm18_scale2; |
| if (MO.getExpr()->getKind() == MCExpr::Specifier) |
| Kind = getTargetFixup(MO.getExpr()); |
| |
| addFixup(Fixups, 0, MO.getExpr(), Kind); |
| return 0; |
| } |
| |
| void expandJBTF(const MCInst &MI, SmallVectorImpl<char> &CB, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| void expandNEG(const MCInst &MI, SmallVectorImpl<char> &CB, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| void expandRSUBI(const MCInst &MI, SmallVectorImpl<char> &CB, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| }; |
| } // namespace |
| |
| unsigned CSKYMCCodeEmitter::getOImmOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(Idx); |
| assert(MO.isImm() && "Unexpected MO type."); |
| return MO.getImm() - 1; |
| } |
| |
| unsigned |
| CSKYMCCodeEmitter::getImmOpValueIDLY(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(Idx); |
| assert(MO.isImm() && "Unexpected MO type."); |
| |
| auto V = (MO.getImm() <= 3) ? 4 : MO.getImm(); |
| return V - 1; |
| } |
| |
| unsigned |
| CSKYMCCodeEmitter::getImmOpValueMSBSize(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MSB = MI.getOperand(Idx); |
| const MCOperand &LSB = MI.getOperand(Idx + 1); |
| assert(MSB.isImm() && LSB.isImm() && "Unexpected MO type."); |
| |
| return MSB.getImm() - LSB.getImm(); |
| } |
| |
| static void writeData(uint32_t Bin, unsigned Size, SmallVectorImpl<char> &CB) { |
| if (Size == 4) |
| support::endian::write(CB, static_cast<uint16_t>(Bin >> 16), |
| llvm::endianness::little); |
| support::endian::write(CB, static_cast<uint16_t>(Bin), |
| llvm::endianness::little); |
| } |
| |
| void CSKYMCCodeEmitter::expandJBTF(const MCInst &MI, SmallVectorImpl<char> &CB, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| |
| MCInst TmpInst; |
| |
| uint32_t Binary; |
| |
| TmpInst = |
| MCInstBuilder(MI.getOpcode() == CSKY::JBT_E ? CSKY::BF16 : CSKY::BT16) |
| .addOperand(MI.getOperand(0)) |
| .addImm(6); |
| Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI); |
| writeData(Binary, 2, CB); |
| |
| if (!STI.hasFeature(CSKY::Has2E3)) |
| TmpInst = MCInstBuilder(CSKY::BR32) |
| .addOperand(MI.getOperand(1)) |
| .addOperand(MI.getOperand(2)); |
| else |
| TmpInst = MCInstBuilder(CSKY::JMPI32).addOperand(MI.getOperand(2)); |
| Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI); |
| Fixups[Fixups.size() - 1].setOffset(2); |
| writeData(Binary, 4, CB); |
| } |
| |
| void CSKYMCCodeEmitter::expandNEG(const MCInst &MI, SmallVectorImpl<char> &CB, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| |
| MCInst TmpInst; |
| uint32_t Binary; |
| unsigned Size = MI.getOpcode() == CSKY::NEG32 ? 4 : 2; |
| |
| TmpInst = MCInstBuilder(Size == 4 ? CSKY::NOT32 : CSKY::NOT16) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(1)); |
| Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI); |
| writeData(Binary, Size, CB); |
| |
| TmpInst = MCInstBuilder(Size == 4 ? CSKY::ADDI32 : CSKY::ADDI16) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(0)) |
| .addImm(1); |
| Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI); |
| writeData(Binary, Size, CB); |
| } |
| |
| void CSKYMCCodeEmitter::expandRSUBI(const MCInst &MI, SmallVectorImpl<char> &CB, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| |
| MCInst TmpInst; |
| uint32_t Binary; |
| unsigned Size = MI.getOpcode() == CSKY::RSUBI32 ? 4 : 2; |
| |
| TmpInst = MCInstBuilder(Size == 4 ? CSKY::NOT32 : CSKY::NOT16) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(1)); |
| Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI); |
| writeData(Binary, Size, CB); |
| |
| TmpInst = MCInstBuilder(Size == 4 ? CSKY::ADDI32 : CSKY::ADDI16) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(0)) |
| .addImm(MI.getOperand(2).getImm() + 1); |
| Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI); |
| writeData(Binary, Size, CB); |
| } |
| |
| void CSKYMCCodeEmitter::encodeInstruction(const MCInst &MI, |
| SmallVectorImpl<char> &CB, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCInstrDesc &Desc = MII.get(MI.getOpcode()); |
| unsigned Size = Desc.getSize(); |
| |
| MCInst TmpInst; |
| |
| switch (MI.getOpcode()) { |
| default: |
| TmpInst = MI; |
| break; |
| case CSKY::JBT_E: |
| case CSKY::JBF_E: |
| expandJBTF(MI, CB, Fixups, STI); |
| MCNumEmitted += 2; |
| return; |
| case CSKY::NEG32: |
| case CSKY::NEG16: |
| expandNEG(MI, CB, Fixups, STI); |
| MCNumEmitted += 2; |
| return; |
| case CSKY::RSUBI32: |
| case CSKY::RSUBI16: |
| expandRSUBI(MI, CB, Fixups, STI); |
| MCNumEmitted += 2; |
| return; |
| case CSKY::JBSR32: |
| TmpInst = MCInstBuilder(CSKY::BSR32).addOperand(MI.getOperand(0)); |
| break; |
| case CSKY::JBR16: |
| TmpInst = MCInstBuilder(CSKY::BR16).addOperand(MI.getOperand(0)); |
| break; |
| case CSKY::JBR32: |
| TmpInst = MCInstBuilder(CSKY::BR32).addOperand(MI.getOperand(0)); |
| break; |
| case CSKY::JBT16: |
| TmpInst = MCInstBuilder(CSKY::BT16) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(1)); |
| break; |
| case CSKY::JBT32: |
| TmpInst = MCInstBuilder(CSKY::BT32) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(1)); |
| break; |
| case CSKY::JBF16: |
| TmpInst = MCInstBuilder(CSKY::BF16) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(1)); |
| break; |
| case CSKY::JBF32: |
| TmpInst = MCInstBuilder(CSKY::BF32) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(1)); |
| break; |
| case CSKY::LRW32_Gen: |
| TmpInst = MCInstBuilder(CSKY::LRW32) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(2)); |
| break; |
| case CSKY::LRW16_Gen: |
| TmpInst = MCInstBuilder(CSKY::LRW16) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(2)); |
| break; |
| case CSKY::CMPLEI32: |
| TmpInst = MCInstBuilder(CSKY::CMPLTI32) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(1)) |
| .addImm(MI.getOperand(2).getImm() + 1); |
| break; |
| case CSKY::CMPLEI16: |
| TmpInst = MCInstBuilder(CSKY::CMPLTI16) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(1)) |
| .addImm(MI.getOperand(2).getImm() + 1); |
| break; |
| case CSKY::ROTRI32: |
| TmpInst = MCInstBuilder(CSKY::ROTLI32) |
| .addOperand(MI.getOperand(0)) |
| .addOperand(MI.getOperand(1)) |
| .addImm(32 - MI.getOperand(2).getImm()); |
| break; |
| case CSKY::BGENI: |
| auto V = 1 << MI.getOperand(1).getImm(); |
| TmpInst = |
| MCInstBuilder(CSKY::MOVI32).addOperand(MI.getOperand(0)).addImm(V); |
| break; |
| } |
| |
| ++MCNumEmitted; |
| writeData(getBinaryCodeForInstr(TmpInst, Fixups, STI), Size, CB); |
| } |
| |
| unsigned |
| CSKYMCCodeEmitter::getMachineOpValue(const MCInst &MI, const MCOperand &MO, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| if (MO.isReg()) |
| return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| |
| if (MO.isImm()) |
| return static_cast<unsigned>(MO.getImm()); |
| |
| llvm_unreachable("Unhandled expression!"); |
| return 0; |
| } |
| |
| unsigned |
| CSKYMCCodeEmitter::getRegSeqImmOpValue(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| assert(MI.getOperand(Idx).isReg() && "Unexpected MO type."); |
| assert(MI.getOperand(Idx + 1).isImm() && "Unexpected MO type."); |
| |
| unsigned Ry = MI.getOperand(Idx).getReg(); |
| unsigned Rz = MI.getOperand(Idx + 1).getImm(); |
| |
| unsigned Imm = Ctx.getRegisterInfo()->getEncodingValue(Rz) - |
| Ctx.getRegisterInfo()->getEncodingValue(Ry); |
| |
| return ((Ctx.getRegisterInfo()->getEncodingValue(Ry) << 5) | Imm); |
| } |
| |
| unsigned |
| CSKYMCCodeEmitter::getRegisterSeqOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| unsigned Reg1 = |
| Ctx.getRegisterInfo()->getEncodingValue(MI.getOperand(Op).getReg()); |
| unsigned Reg2 = |
| Ctx.getRegisterInfo()->getEncodingValue(MI.getOperand(Op + 1).getReg()); |
| |
| unsigned Binary = ((Reg1 & 0x1f) << 5) | (Reg2 - Reg1); |
| |
| return Binary; |
| } |
| |
| unsigned CSKYMCCodeEmitter::getImmJMPIX(const MCInst &MI, unsigned Idx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| switch (MI.getOperand(Idx).getImm()) { |
| default: |
| llvm_unreachable("Unhandled jmpix imm!"); |
| case 16: |
| return 0; |
| case 24: |
| return 1; |
| case 32: |
| return 2; |
| case 40: |
| return 3; |
| } |
| } |
| |
| MCFixupKind CSKYMCCodeEmitter::getTargetFixup(const MCExpr *Expr) const { |
| const auto *CSKYExpr = cast<MCSpecifierExpr>(Expr); |
| switch (CSKYExpr->getSpecifier()) { |
| default: |
| llvm_unreachable("Unhandled fixup kind!"); |
| case CSKY::S_ADDR: |
| return CSKY::fixup_csky_addr32; |
| case CSKY::S_ADDR_HI16: |
| return CSKY::fixup_csky_addr_hi16; |
| case CSKY::S_ADDR_LO16: |
| return CSKY::fixup_csky_addr_lo16; |
| case CSKY::S_GOT: |
| return CSKY::fixup_csky_got32; |
| case CSKY::S_GOTPC: |
| return CSKY::fixup_csky_gotpc; |
| case CSKY::S_GOTOFF: |
| return CSKY::fixup_csky_gotoff; |
| case CSKY::S_PLT: |
| return CSKY::fixup_csky_plt32; |
| case CSKY::S_PLT_IMM18_BY4: |
| return CSKY::fixup_csky_plt_imm18_scale4; |
| case CSKY::S_GOT_IMM18_BY4: |
| return CSKY::fixup_csky_got_imm18_scale4; |
| } |
| } |
| |
| MCCodeEmitter *llvm::createCSKYMCCodeEmitter(const MCInstrInfo &MCII, |
| MCContext &Ctx) { |
| return new CSKYMCCodeEmitter(Ctx, MCII); |
| } |
| |
| #include "CSKYGenMCCodeEmitter.inc" |
