| //===-- 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 "CSKYMCCodeEmitter.h" | |
| #include "CSKYMCExpr.h" | |
| #include "MCTargetDesc/CSKYMCTargetDesc.h" | |
| #include "llvm/ADT/Statistic.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"); | |
| 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, raw_ostream &OS) { | |
| uint16_t LO16 = static_cast<uint16_t>(Bin); | |
| uint16_t HI16 = static_cast<uint16_t>(Bin >> 16); | |
| if (Size == 4) | |
| support::endian::write<uint16_t>(OS, HI16, support::little); | |
| support::endian::write<uint16_t>(OS, LO16, support::little); | |
| } | |
| void CSKYMCCodeEmitter::expandJBTF(const MCInst &MI, raw_ostream &OS, | |
| 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, OS); | |
| if (!STI.getFeatureBits()[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, OS); | |
| } | |
| void CSKYMCCodeEmitter::expandNEG(const MCInst &MI, raw_ostream &OS, | |
| 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, OS); | |
| 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, OS); | |
| } | |
| void CSKYMCCodeEmitter::expandRSUBI(const MCInst &MI, raw_ostream &OS, | |
| 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, OS); | |
| 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, OS); | |
| } | |
| void CSKYMCCodeEmitter::encodeInstruction(const MCInst &MI, raw_ostream &OS, | |
| 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, OS, Fixups, STI); | |
| MCNumEmitted += 2; | |
| return; | |
| case CSKY::NEG32: | |
| case CSKY::NEG16: | |
| expandNEG(MI, OS, Fixups, STI); | |
| MCNumEmitted += 2; | |
| return; | |
| case CSKY::RSUBI32: | |
| case CSKY::RSUBI16: | |
| expandRSUBI(MI, OS, 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; | |
| uint32_t Bin = getBinaryCodeForInstr(TmpInst, Fixups, STI); | |
| uint16_t LO16 = static_cast<uint16_t>(Bin); | |
| uint16_t HI16 = static_cast<uint16_t>(Bin >> 16); | |
| if (Size == 4) | |
| support::endian::write<uint16_t>(OS, HI16, support::little); | |
| support::endian::write<uint16_t>(OS, LO16, support::little); | |
| } | |
| 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 { | |
| if (MI.getOperand(Idx).getImm() == 16) | |
| return 0; | |
| else if (MI.getOperand(Idx).getImm() == 24) | |
| return 1; | |
| else if (MI.getOperand(Idx).getImm() == 32) | |
| return 2; | |
| else if (MI.getOperand(Idx).getImm() == 40) | |
| return 3; | |
| else | |
| assert(0); | |
| } | |
| MCFixupKind CSKYMCCodeEmitter::getTargetFixup(const MCExpr *Expr) const { | |
| const CSKYMCExpr *CSKYExpr = cast<CSKYMCExpr>(Expr); | |
| switch (CSKYExpr->getKind()) { | |
| default: | |
| llvm_unreachable("Unhandled fixup kind!"); | |
| case CSKYMCExpr::VK_CSKY_ADDR: | |
| return MCFixupKind(CSKY::fixup_csky_addr32); | |
| case CSKYMCExpr::VK_CSKY_ADDR_HI16: | |
| return MCFixupKind(CSKY::fixup_csky_addr_hi16); | |
| case CSKYMCExpr::VK_CSKY_ADDR_LO16: | |
| return MCFixupKind(CSKY::fixup_csky_addr_lo16); | |
| case CSKYMCExpr::VK_CSKY_GOT: | |
| return MCFixupKind(CSKY::fixup_csky_got32); | |
| case CSKYMCExpr::VK_CSKY_GOTPC: | |
| return MCFixupKind(CSKY::fixup_csky_gotpc); | |
| case CSKYMCExpr::VK_CSKY_GOTOFF: | |
| return MCFixupKind(CSKY::fixup_csky_gotoff); | |
| case CSKYMCExpr::VK_CSKY_PLT: | |
| return MCFixupKind(CSKY::fixup_csky_plt32); | |
| case CSKYMCExpr::VK_CSKY_PLT_IMM18_BY4: | |
| return MCFixupKind(CSKY::fixup_csky_plt_imm18_scale4); | |
| case CSKYMCExpr::VK_CSKY_GOT_IMM18_BY4: | |
| return MCFixupKind(CSKY::fixup_csky_got_imm18_scale4); | |
| } | |
| } | |
| MCCodeEmitter *llvm::createCSKYMCCodeEmitter(const MCInstrInfo &MCII, | |
| MCContext &Ctx) { | |
| return new CSKYMCCodeEmitter(Ctx, MCII); | |
| } | |
| #include "CSKYGenMCCodeEmitter.inc" |