| //===-- ARM/ARMMCCodeEmitter.cpp - Convert ARM code to machine code -------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the ARMMCCodeEmitter class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "mccodeemitter" |
| #include "MCTargetDesc/ARMMCTargetDesc.h" |
| #include "MCTargetDesc/ARMAddressingModes.h" |
| #include "MCTargetDesc/ARMBaseInfo.h" |
| #include "MCTargetDesc/ARMFixupKinds.h" |
| #include "MCTargetDesc/ARMMCExpr.h" |
| #include "llvm/ADT/APFloat.h" |
| #include "llvm/ADT/Statistic.h" |
| #include "llvm/MC/MCCodeEmitter.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCInst.h" |
| #include "llvm/MC/MCInstrInfo.h" |
| #include "llvm/MC/MCRegisterInfo.h" |
| #include "llvm/MC/MCSubtargetInfo.h" |
| #include "llvm/Support/raw_ostream.h" |
| |
| using namespace llvm; |
| |
| STATISTIC(MCNumEmitted, "Number of MC instructions emitted."); |
| STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created."); |
| |
| namespace { |
| class ARMMCCodeEmitter : public MCCodeEmitter { |
| ARMMCCodeEmitter(const ARMMCCodeEmitter &) LLVM_DELETED_FUNCTION; |
| void operator=(const ARMMCCodeEmitter &) LLVM_DELETED_FUNCTION; |
| const MCInstrInfo &MCII; |
| const MCSubtargetInfo &STI; |
| const MCContext &CTX; |
| |
| public: |
| ARMMCCodeEmitter(const MCInstrInfo &mcii, const MCSubtargetInfo &sti, |
| MCContext &ctx) |
| : MCII(mcii), STI(sti), CTX(ctx) { |
| } |
| |
| ~ARMMCCodeEmitter() {} |
| |
| bool isThumb() const { |
| // FIXME: Can tablegen auto-generate this? |
| return (STI.getFeatureBits() & ARM::ModeThumb) != 0; |
| } |
| bool isThumb2() const { |
| return isThumb() && (STI.getFeatureBits() & ARM::FeatureThumb2) != 0; |
| } |
| bool isTargetDarwin() const { |
| Triple TT(STI.getTargetTriple()); |
| Triple::OSType OS = TT.getOS(); |
| return OS == Triple::Darwin || OS == Triple::MacOSX || OS == Triple::IOS; |
| } |
| |
| unsigned getMachineSoImmOpValue(unsigned SoImm) const; |
| |
| // getBinaryCodeForInstr - TableGen'erated function for getting the |
| // binary encoding for an instruction. |
| uint64_t getBinaryCodeForInstr(const MCInst &MI, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getMachineOpValue - Return binary encoding of operand. If the machine |
| /// operand requires relocation, record the relocation and return zero. |
| unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of |
| /// the specified operand. This is used for operands with :lower16: and |
| /// :upper16: prefixes. |
| uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, |
| unsigned &Reg, unsigned &Imm, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate |
| /// BL branch target. |
| uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate |
| /// BLX branch target. |
| uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target. |
| uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target. |
| uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target. |
| uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getBranchTargetOpValue - Return encoding info for 24-bit immediate |
| /// branch target. |
| uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit |
| /// immediate Thumb2 direct branch target. |
| uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate |
| /// branch target. |
| uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| uint32_t getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| uint32_t getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getAdrLabelOpValue - Return encoding info for 12-bit immediate |
| /// ADR label target. |
| uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| |
| /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' |
| /// operand. |
| uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand. |
| uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups)const; |
| |
| /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2' |
| /// operand. |
| uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for 'reg + imm8<<2' |
| /// operand. |
| uint32_t getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getT2Imm8s4OpValue - Return encoding info for '+/- imm8<<2' |
| /// operand. |
| uint32_t getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| |
| /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm' |
| /// operand as needed by load/store instructions. |
| uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getLdStmModeOpValue - Return encoding for load/store multiple mode. |
| uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm(); |
| switch (Mode) { |
| default: llvm_unreachable("Unknown addressing sub-mode!"); |
| case ARM_AM::da: return 0; |
| case ARM_AM::ia: return 1; |
| case ARM_AM::db: return 2; |
| case ARM_AM::ib: return 3; |
| } |
| } |
| /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value. |
| /// |
| unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const { |
| switch (ShOpc) { |
| case ARM_AM::no_shift: |
| case ARM_AM::lsl: return 0; |
| case ARM_AM::lsr: return 1; |
| case ARM_AM::asr: return 2; |
| case ARM_AM::ror: |
| case ARM_AM::rrx: return 3; |
| } |
| llvm_unreachable("Invalid ShiftOpc!"); |
| } |
| |
| /// getAddrMode2OpValue - Return encoding for addrmode2 operands. |
| uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands. |
| uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getPostIdxRegOpValue - Return encoding for postidx_reg operands. |
| uint32_t getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands. |
| uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getAddrMode3OpValue - Return encoding for addrmode3 operands. |
| uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12' |
| /// operand. |
| uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getAddrModeISOpValue - Encode the t_addrmode_is# operands. |
| uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands. |
| uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand. |
| uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getCCOutOpValue - Return encoding of the 's' bit. |
| unsigned getCCOutOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or |
| // '1' respectively. |
| return MI.getOperand(Op).getReg() == ARM::CPSR; |
| } |
| |
| /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value. |
| unsigned getSOImmOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| unsigned SoImm = MI.getOperand(Op).getImm(); |
| int SoImmVal = ARM_AM::getSOImmVal(SoImm); |
| assert(SoImmVal != -1 && "Not a valid so_imm value!"); |
| |
| // Encode rotate_imm. |
| unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1) |
| << ARMII::SoRotImmShift; |
| |
| // Encode immed_8. |
| Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal); |
| return Binary; |
| } |
| |
| /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value. |
| unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| unsigned SoImm = MI.getOperand(Op).getImm(); |
| unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm); |
| assert(Encoded != ~0U && "Not a Thumb2 so_imm value?"); |
| return Encoded; |
| } |
| |
| unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| /// getSORegOpValue - Return an encoded so_reg shifted register value. |
| unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| return 64 - MI.getOperand(Op).getImm(); |
| } |
| |
| unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| |
| unsigned NEONThumb2DataIPostEncoder(const MCInst &MI, |
| unsigned EncodedValue) const; |
| unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI, |
| unsigned EncodedValue) const; |
| unsigned NEONThumb2DupPostEncoder(const MCInst &MI, |
| unsigned EncodedValue) const; |
| unsigned NEONThumb2V8PostEncoder(const MCInst &MI, |
| unsigned EncodedValue) const; |
| |
| unsigned VFPThumb2PostEncoder(const MCInst &MI, |
| unsigned EncodedValue) const; |
| |
| void EmitByte(unsigned char C, raw_ostream &OS) const { |
| OS << (char)C; |
| } |
| |
| void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const { |
| // Output the constant in little endian byte order. |
| for (unsigned i = 0; i != Size; ++i) { |
| EmitByte(Val & 255, OS); |
| Val >>= 8; |
| } |
| } |
| |
| void EncodeInstruction(const MCInst &MI, raw_ostream &OS, |
| SmallVectorImpl<MCFixup> &Fixups) const; |
| }; |
| |
| } // end anonymous namespace |
| |
| MCCodeEmitter *llvm::createARMMCCodeEmitter(const MCInstrInfo &MCII, |
| const MCRegisterInfo &MRI, |
| const MCSubtargetInfo &STI, |
| MCContext &Ctx) { |
| return new ARMMCCodeEmitter(MCII, STI, Ctx); |
| } |
| |
| /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing |
| /// instructions, and rewrite them to their Thumb2 form if we are currently in |
| /// Thumb2 mode. |
| unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI, |
| unsigned EncodedValue) const { |
| if (isThumb2()) { |
| // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved |
| // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are |
| // set to 1111. |
| unsigned Bit24 = EncodedValue & 0x01000000; |
| unsigned Bit28 = Bit24 << 4; |
| EncodedValue &= 0xEFFFFFFF; |
| EncodedValue |= Bit28; |
| EncodedValue |= 0x0F000000; |
| } |
| |
| return EncodedValue; |
| } |
| |
| /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store |
| /// instructions, and rewrite them to their Thumb2 form if we are currently in |
| /// Thumb2 mode. |
| unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI, |
| unsigned EncodedValue) const { |
| if (isThumb2()) { |
| EncodedValue &= 0xF0FFFFFF; |
| EncodedValue |= 0x09000000; |
| } |
| |
| return EncodedValue; |
| } |
| |
| /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup |
| /// instructions, and rewrite them to their Thumb2 form if we are currently in |
| /// Thumb2 mode. |
| unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI, |
| unsigned EncodedValue) const { |
| if (isThumb2()) { |
| EncodedValue &= 0x00FFFFFF; |
| EncodedValue |= 0xEE000000; |
| } |
| |
| return EncodedValue; |
| } |
| |
| /// Post-process encoded NEON v8 instructions, and rewrite them to Thumb2 form |
| /// if we are in Thumb2. |
| unsigned ARMMCCodeEmitter::NEONThumb2V8PostEncoder(const MCInst &MI, |
| unsigned EncodedValue) const { |
| if (isThumb2()) { |
| EncodedValue |= 0xC000000; // Set bits 27-26 |
| } |
| |
| return EncodedValue; |
| } |
| |
| /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite |
| /// them to their Thumb2 form if we are currently in Thumb2 mode. |
| unsigned ARMMCCodeEmitter:: |
| VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue) const { |
| if (isThumb2()) { |
| EncodedValue &= 0x0FFFFFFF; |
| EncodedValue |= 0xE0000000; |
| } |
| return EncodedValue; |
| } |
| |
| /// getMachineOpValue - Return binary encoding of operand. If the machine |
| /// operand requires relocation, record the relocation and return zero. |
| unsigned ARMMCCodeEmitter:: |
| getMachineOpValue(const MCInst &MI, const MCOperand &MO, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| if (MO.isReg()) { |
| unsigned Reg = MO.getReg(); |
| unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg); |
| |
| // Q registers are encoded as 2x their register number. |
| switch (Reg) { |
| default: |
| return RegNo; |
| case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3: |
| case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7: |
| case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11: |
| case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15: |
| return 2 * RegNo; |
| } |
| } else if (MO.isImm()) { |
| return static_cast<unsigned>(MO.getImm()); |
| } else if (MO.isFPImm()) { |
| return static_cast<unsigned>(APFloat(MO.getFPImm()) |
| .bitcastToAPInt().getHiBits(32).getLimitedValue()); |
| } |
| |
| llvm_unreachable("Unable to encode MCOperand!"); |
| } |
| |
| /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand. |
| bool ARMMCCodeEmitter:: |
| EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg, |
| unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx + 1); |
| |
| Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| |
| int32_t SImm = MO1.getImm(); |
| bool isAdd = true; |
| |
| // Special value for #-0 |
| if (SImm == INT32_MIN) { |
| SImm = 0; |
| isAdd = false; |
| } |
| |
| // Immediate is always encoded as positive. The 'U' bit controls add vs sub. |
| if (SImm < 0) { |
| SImm = -SImm; |
| isAdd = false; |
| } |
| |
| Imm = SImm; |
| return isAdd; |
| } |
| |
| /// getBranchTargetOpValue - Helper function to get the branch target operand, |
| /// which is either an immediate or requires a fixup. |
| static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| unsigned FixupKind, |
| SmallVectorImpl<MCFixup> &Fixups) { |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| |
| // If the destination is an immediate, we have nothing to do. |
| if (MO.isImm()) return MO.getImm(); |
| assert(MO.isExpr() && "Unexpected branch target type!"); |
| const MCExpr *Expr = MO.getExpr(); |
| MCFixupKind Kind = MCFixupKind(FixupKind); |
| Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); |
| |
| // All of the information is in the fixup. |
| return 0; |
| } |
| |
| // Thumb BL and BLX use a strange offset encoding where bits 22 and 21 are |
| // determined by negating them and XOR'ing them with bit 23. |
| static int32_t encodeThumbBLOffset(int32_t offset) { |
| offset >>= 1; |
| uint32_t S = (offset & 0x800000) >> 23; |
| uint32_t J1 = (offset & 0x400000) >> 22; |
| uint32_t J2 = (offset & 0x200000) >> 21; |
| J1 = (~J1 & 0x1); |
| J2 = (~J2 & 0x1); |
| J1 ^= S; |
| J2 ^= S; |
| |
| offset &= ~0x600000; |
| offset |= J1 << 22; |
| offset |= J2 << 21; |
| |
| return offset; |
| } |
| |
| /// getThumbBLTargetOpValue - Return encoding info for immediate branch target. |
| uint32_t ARMMCCodeEmitter:: |
| getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl, |
| Fixups); |
| return encodeThumbBLOffset(MO.getImm()); |
| } |
| |
| /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate |
| /// BLX branch target. |
| uint32_t ARMMCCodeEmitter:: |
| getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx, |
| Fixups); |
| return encodeThumbBLOffset(MO.getImm()); |
| } |
| |
| /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target. |
| uint32_t ARMMCCodeEmitter:: |
| getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br, |
| Fixups); |
| return (MO.getImm() >> 1); |
| } |
| |
| /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target. |
| uint32_t ARMMCCodeEmitter:: |
| getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc, |
| Fixups); |
| return (MO.getImm() >> 1); |
| } |
| |
| /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target. |
| uint32_t ARMMCCodeEmitter:: |
| getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups); |
| return (MO.getImm() >> 1); |
| } |
| |
| /// Return true if this branch has a non-always predication |
| static bool HasConditionalBranch(const MCInst &MI) { |
| int NumOp = MI.getNumOperands(); |
| if (NumOp >= 2) { |
| for (int i = 0; i < NumOp-1; ++i) { |
| const MCOperand &MCOp1 = MI.getOperand(i); |
| const MCOperand &MCOp2 = MI.getOperand(i + 1); |
| if (MCOp1.isImm() && MCOp2.isReg() && |
| (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) { |
| if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL) |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch |
| /// target. |
| uint32_t ARMMCCodeEmitter:: |
| getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // FIXME: This really, really shouldn't use TargetMachine. We don't want |
| // coupling between MC and TM anywhere we can help it. |
| if (isThumb2()) |
| return |
| ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups); |
| return getARMBranchTargetOpValue(MI, OpIdx, Fixups); |
| } |
| |
| /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch |
| /// target. |
| uint32_t ARMMCCodeEmitter:: |
| getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) { |
| if (HasConditionalBranch(MI)) |
| return ::getBranchTargetOpValue(MI, OpIdx, |
| ARM::fixup_arm_condbranch, Fixups); |
| return ::getBranchTargetOpValue(MI, OpIdx, |
| ARM::fixup_arm_uncondbranch, Fixups); |
| } |
| |
| return MO.getImm() >> 2; |
| } |
| |
| uint32_t ARMMCCodeEmitter:: |
| getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) { |
| if (HasConditionalBranch(MI)) |
| return ::getBranchTargetOpValue(MI, OpIdx, |
| ARM::fixup_arm_condbl, Fixups); |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_uncondbl, Fixups); |
| } |
| |
| return MO.getImm() >> 2; |
| } |
| |
| uint32_t ARMMCCodeEmitter:: |
| getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_blx, Fixups); |
| |
| return MO.getImm() >> 1; |
| } |
| |
| /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit |
| /// immediate branch target. |
| uint32_t ARMMCCodeEmitter:: |
| getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| unsigned Val = |
| ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups); |
| bool I = (Val & 0x800000); |
| bool J1 = (Val & 0x400000); |
| bool J2 = (Val & 0x200000); |
| if (I ^ J1) |
| Val &= ~0x400000; |
| else |
| Val |= 0x400000; |
| |
| if (I ^ J2) |
| Val &= ~0x200000; |
| else |
| Val |= 0x200000; |
| |
| return Val; |
| } |
| |
| /// getAdrLabelOpValue - Return encoding info for 12-bit shifted-immediate |
| /// ADR label target. |
| uint32_t ARMMCCodeEmitter:: |
| getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12, |
| Fixups); |
| int32_t offset = MO.getImm(); |
| uint32_t Val = 0x2000; |
| |
| int SoImmVal; |
| if (offset == INT32_MIN) { |
| Val = 0x1000; |
| SoImmVal = 0; |
| } else if (offset < 0) { |
| Val = 0x1000; |
| offset *= -1; |
| SoImmVal = ARM_AM::getSOImmVal(offset); |
| if(SoImmVal == -1) { |
| Val = 0x2000; |
| offset *= -1; |
| SoImmVal = ARM_AM::getSOImmVal(offset); |
| } |
| } else { |
| SoImmVal = ARM_AM::getSOImmVal(offset); |
| if(SoImmVal == -1) { |
| Val = 0x1000; |
| offset *= -1; |
| SoImmVal = ARM_AM::getSOImmVal(offset); |
| } |
| } |
| |
| assert(SoImmVal != -1 && "Not a valid so_imm value!"); |
| |
| Val |= SoImmVal; |
| return Val; |
| } |
| |
| /// getT2AdrLabelOpValue - Return encoding info for 12-bit immediate ADR label |
| /// target. |
| uint32_t ARMMCCodeEmitter:: |
| getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12, |
| Fixups); |
| int32_t Val = MO.getImm(); |
| if (Val == INT32_MIN) |
| Val = 0x1000; |
| else if (Val < 0) { |
| Val *= -1; |
| Val |= 0x1000; |
| } |
| return Val; |
| } |
| |
| /// getThumbAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label |
| /// target. |
| uint32_t ARMMCCodeEmitter:: |
| getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10, |
| Fixups); |
| return MO.getImm(); |
| } |
| |
| /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg' |
| /// operand. |
| uint32_t ARMMCCodeEmitter:: |
| getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &) const { |
| // [Rn, Rm] |
| // {5-3} = Rm |
| // {2-0} = Rn |
| const MCOperand &MO1 = MI.getOperand(OpIdx); |
| const MCOperand &MO2 = MI.getOperand(OpIdx + 1); |
| unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); |
| unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO2.getReg()); |
| return (Rm << 3) | Rn; |
| } |
| |
| /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand. |
| uint32_t ARMMCCodeEmitter:: |
| getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {17-13} = reg |
| // {12} = (U)nsigned (add == '1', sub == '0') |
| // {11-0} = imm12 |
| unsigned Reg, Imm12; |
| bool isAdd = true; |
| // If The first operand isn't a register, we have a label reference. |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| if (!MO.isReg()) { |
| Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC. |
| Imm12 = 0; |
| |
| if (MO.isExpr()) { |
| const MCExpr *Expr = MO.getExpr(); |
| isAdd = false ; // 'U' bit is set as part of the fixup. |
| |
| MCFixupKind Kind; |
| if (isThumb2()) |
| Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12); |
| else |
| Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12); |
| Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); |
| |
| ++MCNumCPRelocations; |
| } else { |
| Reg = ARM::PC; |
| int32_t Offset = MO.getImm(); |
| // FIXME: Handle #-0. |
| if (Offset < 0) { |
| Offset *= -1; |
| isAdd = false; |
| } |
| Imm12 = Offset; |
| } |
| } else |
| isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups); |
| |
| uint32_t Binary = Imm12 & 0xfff; |
| // Immediate is always encoded as positive. The 'U' bit controls add vs sub. |
| if (isAdd) |
| Binary |= (1 << 12); |
| Binary |= (Reg << 13); |
| return Binary; |
| } |
| |
| /// getT2Imm8s4OpValue - Return encoding info for |
| /// '+/- imm8<<2' operand. |
| uint32_t ARMMCCodeEmitter:: |
| getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // FIXME: The immediate operand should have already been encoded like this |
| // before ever getting here. The encoder method should just need to combine |
| // the MI operands for the register and the offset into a single |
| // representation for the complex operand in the .td file. This isn't just |
| // style, unfortunately. As-is, we can't represent the distinct encoding |
| // for #-0. |
| |
| // {8} = (U)nsigned (add == '1', sub == '0') |
| // {7-0} = imm8 |
| int32_t Imm8 = MI.getOperand(OpIdx).getImm(); |
| bool isAdd = Imm8 >= 0; |
| |
| // Immediate is always encoded as positive. The 'U' bit controls add vs sub. |
| if (Imm8 < 0) |
| Imm8 = -(uint32_t)Imm8; |
| |
| // Scaled by 4. |
| Imm8 /= 4; |
| |
| uint32_t Binary = Imm8 & 0xff; |
| // Immediate is always encoded as positive. The 'U' bit controls add vs sub. |
| if (isAdd) |
| Binary |= (1 << 8); |
| return Binary; |
| } |
| |
| /// getT2AddrModeImm8s4OpValue - Return encoding info for |
| /// 'reg +/- imm8<<2' operand. |
| uint32_t ARMMCCodeEmitter:: |
| getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {12-9} = reg |
| // {8} = (U)nsigned (add == '1', sub == '0') |
| // {7-0} = imm8 |
| unsigned Reg, Imm8; |
| bool isAdd = true; |
| // If The first operand isn't a register, we have a label reference. |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| if (!MO.isReg()) { |
| Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC. |
| Imm8 = 0; |
| isAdd = false ; // 'U' bit is set as part of the fixup. |
| |
| assert(MO.isExpr() && "Unexpected machine operand type!"); |
| const MCExpr *Expr = MO.getExpr(); |
| MCFixupKind Kind = MCFixupKind(ARM::fixup_t2_pcrel_10); |
| Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); |
| |
| ++MCNumCPRelocations; |
| } else |
| isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups); |
| |
| // FIXME: The immediate operand should have already been encoded like this |
| // before ever getting here. The encoder method should just need to combine |
| // the MI operands for the register and the offset into a single |
| // representation for the complex operand in the .td file. This isn't just |
| // style, unfortunately. As-is, we can't represent the distinct encoding |
| // for #-0. |
| uint32_t Binary = (Imm8 >> 2) & 0xff; |
| // Immediate is always encoded as positive. The 'U' bit controls add vs sub. |
| if (isAdd) |
| Binary |= (1 << 8); |
| Binary |= (Reg << 9); |
| return Binary; |
| } |
| |
| /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for |
| /// 'reg + imm8<<2' operand. |
| uint32_t ARMMCCodeEmitter:: |
| getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {11-8} = reg |
| // {7-0} = imm8 |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx + 1); |
| unsigned Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| unsigned Imm8 = MO1.getImm(); |
| return (Reg << 8) | Imm8; |
| } |
| |
| // FIXME: This routine assumes that a binary |
| // expression will always result in a PCRel expression |
| // In reality, its only true if one or more subexpressions |
| // is itself a PCRel (i.e. "." in asm or some other pcrel construct) |
| // but this is good enough for now. |
| static bool EvaluateAsPCRel(const MCExpr *Expr) { |
| switch (Expr->getKind()) { |
| default: llvm_unreachable("Unexpected expression type"); |
| case MCExpr::SymbolRef: return false; |
| case MCExpr::Binary: return true; |
| } |
| } |
| |
| uint32_t |
| ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {20-16} = imm{15-12} |
| // {11-0} = imm{11-0} |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| if (MO.isImm()) |
| // Hi / lo 16 bits already extracted during earlier passes. |
| return static_cast<unsigned>(MO.getImm()); |
| |
| // Handle :upper16: and :lower16: assembly prefixes. |
| const MCExpr *E = MO.getExpr(); |
| MCFixupKind Kind; |
| if (E->getKind() == MCExpr::Target) { |
| const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E); |
| E = ARM16Expr->getSubExpr(); |
| |
| switch (ARM16Expr->getKind()) { |
| default: llvm_unreachable("Unsupported ARMFixup"); |
| case ARMMCExpr::VK_ARM_HI16: |
| if (!isTargetDarwin() && EvaluateAsPCRel(E)) |
| Kind = MCFixupKind(isThumb2() |
| ? ARM::fixup_t2_movt_hi16_pcrel |
| : ARM::fixup_arm_movt_hi16_pcrel); |
| else |
| Kind = MCFixupKind(isThumb2() |
| ? ARM::fixup_t2_movt_hi16 |
| : ARM::fixup_arm_movt_hi16); |
| break; |
| case ARMMCExpr::VK_ARM_LO16: |
| if (!isTargetDarwin() && EvaluateAsPCRel(E)) |
| Kind = MCFixupKind(isThumb2() |
| ? ARM::fixup_t2_movw_lo16_pcrel |
| : ARM::fixup_arm_movw_lo16_pcrel); |
| else |
| Kind = MCFixupKind(isThumb2() |
| ? ARM::fixup_t2_movw_lo16 |
| : ARM::fixup_arm_movw_lo16); |
| break; |
| } |
| Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc())); |
| return 0; |
| } |
| // If the expression doesn't have :upper16: or :lower16: on it, |
| // it's just a plain immediate expression, and those evaluate to |
| // the lower 16 bits of the expression regardless of whether |
| // we have a movt or a movw. |
| if (!isTargetDarwin() && EvaluateAsPCRel(E)) |
| Kind = MCFixupKind(isThumb2() |
| ? ARM::fixup_t2_movw_lo16_pcrel |
| : ARM::fixup_arm_movw_lo16_pcrel); |
| else |
| Kind = MCFixupKind(isThumb2() |
| ? ARM::fixup_t2_movw_lo16 |
| : ARM::fixup_arm_movw_lo16); |
| Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc())); |
| return 0; |
| } |
| |
| uint32_t ARMMCCodeEmitter:: |
| getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx+1); |
| const MCOperand &MO2 = MI.getOperand(OpIdx+2); |
| unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); |
| unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm()); |
| bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add; |
| ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm()); |
| unsigned SBits = getShiftOp(ShOp); |
| |
| // While "lsr #32" and "asr #32" exist, they are encoded with a 0 in the shift |
| // amount. However, it would be an easy mistake to make so check here. |
| assert((ShImm & ~0x1f) == 0 && "Out of range shift amount"); |
| |
| // {16-13} = Rn |
| // {12} = isAdd |
| // {11-0} = shifter |
| // {3-0} = Rm |
| // {4} = 0 |
| // {6-5} = type |
| // {11-7} = imm |
| uint32_t Binary = Rm; |
| Binary |= Rn << 13; |
| Binary |= SBits << 5; |
| Binary |= ShImm << 7; |
| if (isAdd) |
| Binary |= 1 << 12; |
| return Binary; |
| } |
| |
| uint32_t ARMMCCodeEmitter:: |
| getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {17-14} Rn |
| // {13} 1 == imm12, 0 == Rm |
| // {12} isAdd |
| // {11-0} imm12/Rm |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups); |
| Binary |= Rn << 14; |
| return Binary; |
| } |
| |
| uint32_t ARMMCCodeEmitter:: |
| getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {13} 1 == imm12, 0 == Rm |
| // {12} isAdd |
| // {11-0} imm12/Rm |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx+1); |
| unsigned Imm = MO1.getImm(); |
| bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add; |
| bool isReg = MO.getReg() != 0; |
| uint32_t Binary = ARM_AM::getAM2Offset(Imm); |
| // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12 |
| if (isReg) { |
| ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm); |
| Binary <<= 7; // Shift amount is bits [11:7] |
| Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5] |
| Binary |= CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); // Rm is bits [3:0] |
| } |
| return Binary | (isAdd << 12) | (isReg << 13); |
| } |
| |
| uint32_t ARMMCCodeEmitter:: |
| getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {4} isAdd |
| // {3-0} Rm |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx+1); |
| bool isAdd = MO1.getImm() != 0; |
| return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()) | (isAdd << 4); |
| } |
| |
| uint32_t ARMMCCodeEmitter:: |
| getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {9} 1 == imm8, 0 == Rm |
| // {8} isAdd |
| // {7-4} imm7_4/zero |
| // {3-0} imm3_0/Rm |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx+1); |
| unsigned Imm = MO1.getImm(); |
| bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add; |
| bool isImm = MO.getReg() == 0; |
| uint32_t Imm8 = ARM_AM::getAM3Offset(Imm); |
| // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8 |
| if (!isImm) |
| Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| return Imm8 | (isAdd << 8) | (isImm << 9); |
| } |
| |
| uint32_t ARMMCCodeEmitter:: |
| getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {13} 1 == imm8, 0 == Rm |
| // {12-9} Rn |
| // {8} isAdd |
| // {7-4} imm7_4/zero |
| // {3-0} imm3_0/Rm |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx+1); |
| const MCOperand &MO2 = MI.getOperand(OpIdx+2); |
| |
| // If The first operand isn't a register, we have a label reference. |
| if (!MO.isReg()) { |
| unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC. |
| |
| assert(MO.isExpr() && "Unexpected machine operand type!"); |
| const MCExpr *Expr = MO.getExpr(); |
| MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10_unscaled); |
| Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); |
| |
| ++MCNumCPRelocations; |
| return (Rn << 9) | (1 << 13); |
| } |
| unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| unsigned Imm = MO2.getImm(); |
| bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add; |
| bool isImm = MO1.getReg() == 0; |
| uint32_t Imm8 = ARM_AM::getAM3Offset(Imm); |
| // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8 |
| if (!isImm) |
| Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); |
| return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13); |
| } |
| |
| /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands. |
| uint32_t ARMMCCodeEmitter:: |
| getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // [SP, #imm] |
| // {7-0} = imm8 |
| const MCOperand &MO1 = MI.getOperand(OpIdx + 1); |
| assert(MI.getOperand(OpIdx).getReg() == ARM::SP && |
| "Unexpected base register!"); |
| |
| // The immediate is already shifted for the implicit zeroes, so no change |
| // here. |
| return MO1.getImm() & 0xff; |
| } |
| |
| /// getAddrModeISOpValue - Encode the t_addrmode_is# operands. |
| uint32_t ARMMCCodeEmitter:: |
| getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // [Rn, #imm] |
| // {7-3} = imm5 |
| // {2-0} = Rn |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx + 1); |
| unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| unsigned Imm5 = MO1.getImm(); |
| return ((Imm5 & 0x1f) << 3) | Rn; |
| } |
| |
| /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands. |
| uint32_t ARMMCCodeEmitter:: |
| getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand MO = MI.getOperand(OpIdx); |
| if (MO.isExpr()) |
| return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups); |
| return (MO.getImm() >> 2); |
| } |
| |
| /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand. |
| uint32_t ARMMCCodeEmitter:: |
| getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // {12-9} = reg |
| // {8} = (U)nsigned (add == '1', sub == '0') |
| // {7-0} = imm8 |
| unsigned Reg, Imm8; |
| bool isAdd; |
| // If The first operand isn't a register, we have a label reference. |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| if (!MO.isReg()) { |
| Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC. |
| Imm8 = 0; |
| isAdd = false; // 'U' bit is handled as part of the fixup. |
| |
| assert(MO.isExpr() && "Unexpected machine operand type!"); |
| const MCExpr *Expr = MO.getExpr(); |
| MCFixupKind Kind; |
| if (isThumb2()) |
| Kind = MCFixupKind(ARM::fixup_t2_pcrel_10); |
| else |
| Kind = MCFixupKind(ARM::fixup_arm_pcrel_10); |
| Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); |
| |
| ++MCNumCPRelocations; |
| } else { |
| EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups); |
| isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add; |
| } |
| |
| uint32_t Binary = ARM_AM::getAM5Offset(Imm8); |
| // Immediate is always encoded as positive. The 'U' bit controls add vs sub. |
| if (isAdd) |
| Binary |= (1 << 8); |
| Binary |= (Reg << 9); |
| return Binary; |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getSORegRegOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be |
| // shifted. The second is Rs, the amount to shift by, and the third specifies |
| // the type of the shift. |
| // |
| // {3-0} = Rm. |
| // {4} = 1 |
| // {6-5} = type |
| // {11-8} = Rs |
| // {7} = 0 |
| |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx + 1); |
| const MCOperand &MO2 = MI.getOperand(OpIdx + 2); |
| ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm()); |
| |
| // Encode Rm. |
| unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| |
| // Encode the shift opcode. |
| unsigned SBits = 0; |
| unsigned Rs = MO1.getReg(); |
| if (Rs) { |
| // Set shift operand (bit[7:4]). |
| // LSL - 0001 |
| // LSR - 0011 |
| // ASR - 0101 |
| // ROR - 0111 |
| switch (SOpc) { |
| default: llvm_unreachable("Unknown shift opc!"); |
| case ARM_AM::lsl: SBits = 0x1; break; |
| case ARM_AM::lsr: SBits = 0x3; break; |
| case ARM_AM::asr: SBits = 0x5; break; |
| case ARM_AM::ror: SBits = 0x7; break; |
| } |
| } |
| |
| Binary |= SBits << 4; |
| |
| // Encode the shift operation Rs. |
| // Encode Rs bit[11:8]. |
| assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0); |
| return Binary | (CTX.getRegisterInfo()->getEncodingValue(Rs) << ARMII::RegRsShift); |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getSORegImmOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // Sub-operands are [reg, imm]. The first register is Rm, the reg to be |
| // shifted. The second is the amount to shift by. |
| // |
| // {3-0} = Rm. |
| // {4} = 0 |
| // {6-5} = type |
| // {11-7} = imm |
| |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx + 1); |
| ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm()); |
| |
| // Encode Rm. |
| unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| |
| // Encode the shift opcode. |
| unsigned SBits = 0; |
| |
| // Set shift operand (bit[6:4]). |
| // LSL - 000 |
| // LSR - 010 |
| // ASR - 100 |
| // ROR - 110 |
| // RRX - 110 and bit[11:8] clear. |
| switch (SOpc) { |
| default: llvm_unreachable("Unknown shift opc!"); |
| case ARM_AM::lsl: SBits = 0x0; break; |
| case ARM_AM::lsr: SBits = 0x2; break; |
| case ARM_AM::asr: SBits = 0x4; break; |
| case ARM_AM::ror: SBits = 0x6; break; |
| case ARM_AM::rrx: |
| Binary |= 0x60; |
| return Binary; |
| } |
| |
| // Encode shift_imm bit[11:7]. |
| Binary |= SBits << 4; |
| unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm()); |
| assert(Offset < 32 && "Offset must be in range 0-31!"); |
| return Binary | (Offset << 7); |
| } |
| |
| |
| unsigned ARMMCCodeEmitter:: |
| getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &MO1 = MI.getOperand(OpNum); |
| const MCOperand &MO2 = MI.getOperand(OpNum+1); |
| const MCOperand &MO3 = MI.getOperand(OpNum+2); |
| |
| // Encoded as [Rn, Rm, imm]. |
| // FIXME: Needs fixup support. |
| unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); |
| Value <<= 4; |
| Value |= CTX.getRegisterInfo()->getEncodingValue(MO2.getReg()); |
| Value <<= 2; |
| Value |= MO3.getImm(); |
| |
| return Value; |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &MO1 = MI.getOperand(OpNum); |
| const MCOperand &MO2 = MI.getOperand(OpNum+1); |
| |
| // FIXME: Needs fixup support. |
| unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); |
| |
| // Even though the immediate is 8 bits long, we need 9 bits in order |
| // to represent the (inverse of the) sign bit. |
| Value <<= 9; |
| int32_t tmp = (int32_t)MO2.getImm(); |
| if (tmp < 0) |
| tmp = abs(tmp); |
| else |
| Value |= 256; // Set the ADD bit |
| Value |= tmp & 255; |
| return Value; |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &MO1 = MI.getOperand(OpNum); |
| |
| // FIXME: Needs fixup support. |
| unsigned Value = 0; |
| int32_t tmp = (int32_t)MO1.getImm(); |
| if (tmp < 0) |
| tmp = abs(tmp); |
| else |
| Value |= 256; // Set the ADD bit |
| Value |= tmp & 255; |
| return Value; |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &MO1 = MI.getOperand(OpNum); |
| |
| // FIXME: Needs fixup support. |
| unsigned Value = 0; |
| int32_t tmp = (int32_t)MO1.getImm(); |
| if (tmp < 0) |
| tmp = abs(tmp); |
| else |
| Value |= 4096; // Set the ADD bit |
| Value |= tmp & 4095; |
| return Value; |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getT2SORegOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // Sub-operands are [reg, imm]. The first register is Rm, the reg to be |
| // shifted. The second is the amount to shift by. |
| // |
| // {3-0} = Rm. |
| // {4} = 0 |
| // {6-5} = type |
| // {11-7} = imm |
| |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| const MCOperand &MO1 = MI.getOperand(OpIdx + 1); |
| ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm()); |
| |
| // Encode Rm. |
| unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| |
| // Encode the shift opcode. |
| unsigned SBits = 0; |
| // Set shift operand (bit[6:4]). |
| // LSL - 000 |
| // LSR - 010 |
| // ASR - 100 |
| // ROR - 110 |
| switch (SOpc) { |
| default: llvm_unreachable("Unknown shift opc!"); |
| case ARM_AM::lsl: SBits = 0x0; break; |
| case ARM_AM::lsr: SBits = 0x2; break; |
| case ARM_AM::asr: SBits = 0x4; break; |
| case ARM_AM::rrx: // FALLTHROUGH |
| case ARM_AM::ror: SBits = 0x6; break; |
| } |
| |
| Binary |= SBits << 4; |
| if (SOpc == ARM_AM::rrx) |
| return Binary; |
| |
| // Encode shift_imm bit[11:7]. |
| return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7; |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the |
| // msb of the mask. |
| const MCOperand &MO = MI.getOperand(Op); |
| uint32_t v = ~MO.getImm(); |
| uint32_t lsb = countTrailingZeros(v); |
| uint32_t msb = (32 - countLeadingZeros (v)) - 1; |
| assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!"); |
| return lsb | (msb << 5); |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getRegisterListOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // VLDM/VSTM: |
| // {12-8} = Vd |
| // {7-0} = Number of registers |
| // |
| // LDM/STM: |
| // {15-0} = Bitfield of GPRs. |
| unsigned Reg = MI.getOperand(Op).getReg(); |
| bool SPRRegs = ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg); |
| bool DPRRegs = ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg); |
| |
| unsigned Binary = 0; |
| |
| if (SPRRegs || DPRRegs) { |
| // VLDM/VSTM |
| unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg); |
| unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff; |
| Binary |= (RegNo & 0x1f) << 8; |
| if (SPRRegs) |
| Binary |= NumRegs; |
| else |
| Binary |= NumRegs * 2; |
| } else { |
| for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) { |
| unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(MI.getOperand(I).getReg()); |
| Binary |= 1 << RegNo; |
| } |
| } |
| |
| return Binary; |
| } |
| |
| /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along |
| /// with the alignment operand. |
| unsigned ARMMCCodeEmitter:: |
| getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &Reg = MI.getOperand(Op); |
| const MCOperand &Imm = MI.getOperand(Op + 1); |
| |
| unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg()); |
| unsigned Align = 0; |
| |
| switch (Imm.getImm()) { |
| default: break; |
| case 2: |
| case 4: |
| case 8: Align = 0x01; break; |
| case 16: Align = 0x02; break; |
| case 32: Align = 0x03; break; |
| } |
| |
| return RegNo | (Align << 4); |
| } |
| |
| /// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number |
| /// along with the alignment operand for use in VST1 and VLD1 with size 32. |
| unsigned ARMMCCodeEmitter:: |
| getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &Reg = MI.getOperand(Op); |
| const MCOperand &Imm = MI.getOperand(Op + 1); |
| |
| unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg()); |
| unsigned Align = 0; |
| |
| switch (Imm.getImm()) { |
| default: break; |
| case 8: |
| case 16: |
| case 32: // Default '0' value for invalid alignments of 8, 16, 32 bytes. |
| case 2: Align = 0x00; break; |
| case 4: Align = 0x03; break; |
| } |
| |
| return RegNo | (Align << 4); |
| } |
| |
| |
| /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and |
| /// alignment operand for use in VLD-dup instructions. This is the same as |
| /// getAddrMode6AddressOpValue except for the alignment encoding, which is |
| /// different for VLD4-dup. |
| unsigned ARMMCCodeEmitter:: |
| getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &Reg = MI.getOperand(Op); |
| const MCOperand &Imm = MI.getOperand(Op + 1); |
| |
| unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg()); |
| unsigned Align = 0; |
| |
| switch (Imm.getImm()) { |
| default: break; |
| case 2: |
| case 4: |
| case 8: Align = 0x01; break; |
| case 16: Align = 0x03; break; |
| } |
| |
| return RegNo | (Align << 4); |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| const MCOperand &MO = MI.getOperand(Op); |
| if (MO.getReg() == 0) return 0x0D; |
| return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getShiftRight8Imm(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| return 8 - MI.getOperand(Op).getImm(); |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getShiftRight16Imm(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| return 16 - MI.getOperand(Op).getImm(); |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getShiftRight32Imm(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| return 32 - MI.getOperand(Op).getImm(); |
| } |
| |
| unsigned ARMMCCodeEmitter:: |
| getShiftRight64Imm(const MCInst &MI, unsigned Op, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| return 64 - MI.getOperand(Op).getImm(); |
| } |
| |
| void ARMMCCodeEmitter:: |
| EncodeInstruction(const MCInst &MI, raw_ostream &OS, |
| SmallVectorImpl<MCFixup> &Fixups) const { |
| // Pseudo instructions don't get encoded. |
| const MCInstrDesc &Desc = MCII.get(MI.getOpcode()); |
| uint64_t TSFlags = Desc.TSFlags; |
| if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo) |
| return; |
| |
| int Size; |
| if (Desc.getSize() == 2 || Desc.getSize() == 4) |
| Size = Desc.getSize(); |
| else |
| llvm_unreachable("Unexpected instruction size!"); |
| |
| uint32_t Binary = getBinaryCodeForInstr(MI, Fixups); |
| // Thumb 32-bit wide instructions need to emit the high order halfword |
| // first. |
| if (isThumb() && Size == 4) { |
| EmitConstant(Binary >> 16, 2, OS); |
| EmitConstant(Binary & 0xffff, 2, OS); |
| } else |
| EmitConstant(Binary, Size, OS); |
| ++MCNumEmitted; // Keep track of the # of mi's emitted. |
| } |
| |
| #include "ARMGenMCCodeEmitter.inc" |