//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "arm-emitter"
+#define DEBUG_TYPE "mccodeemitter"
#include "ARM.h"
#include "ARMAddressingModes.h"
+#include "ARMFixupKinds.h"
#include "ARMInstrInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
-STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
+STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
+STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
namespace {
class ARMMCCodeEmitter : public MCCodeEmitter {
~ARMMCCodeEmitter() {}
+ unsigned getNumFixupKinds() const { return ARM::NumTargetFixupKinds; }
+
+ const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
+ const static MCFixupKindInfo Infos[] = {
+ // name offset bits flags
+ { "fixup_arm_pcrel_12", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
+ { "fixup_arm_pcrel_10", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
+ { "fixup_arm_branch", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
+ { "fixup_arm_movt_hi16", 0, 16, 0 },
+ { "fixup_arm_movw_lo16", 0, 16, 0 },
+ };
+
+ if (Kind < FirstTargetFixupKind)
+ return MCCodeEmitter::getFixupKindInfo(Kind);
+
+ assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
+ "Invalid kind!");
+ return Infos[Kind - FirstTargetFixupKind];
+ }
unsigned getMachineSoImmOpValue(unsigned SoImm) const;
// getBinaryCodeForInstr - TableGen'erated function for getting the
// binary encoding for an instruction.
- unsigned getBinaryCodeForInstr(const MCInst &MI) const;
+ unsigned 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) const;
+ unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
+ SmallVectorImpl<MCFixup> &Fixups) const;
+
+ /// getMovtImmOpValue - Return the encoding for the movw/movt pair
+ uint32_t getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &Fixups) const;
+
+ bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
+ unsigned &Reg, unsigned &Imm,
+ 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;
+
+ /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
+ /// ADR label target.
+ uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &Fixups) const;
/// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
/// operand.
- unsigned getAddrModeImm12OpValue(const MCInst &MI, unsigned Op) const;
+ uint32_t getAddrModeImm12OpValue(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;
+
+
+ /// 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: assert(0 && "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) {
+ default: llvm_unreachable("Unknown shift opc!");
+ 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;
+ }
+ return 0;
+ }
+
+ /// 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;
+
+ /// 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;
+
+ /// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
+ uint32_t getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &Fixups) const;
+
+ /// getAddrModeS2OpValue - Return encoding for t_addrmode_s2 operands.
+ uint32_t getAddrModeS2OpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &Fixups) const;
+
+ /// getAddrModeS1OpValue - Return encoding for t_addrmode_s1 operands.
+ uint32_t getAddrModeS1OpValue(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) const {
+ 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) const {
+ 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!");
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 getSORegOpValue(const MCInst &MI, unsigned Op) const;
+ unsigned getSORegOpValue(const MCInst &MI, unsigned Op,
+ SmallVectorImpl<MCFixup> &Fixups) const;
+ unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
+ SmallVectorImpl<MCFixup> &Fixups) const;
- unsigned getRotImmOpValue(const MCInst &MI, unsigned Op) const {
+ unsigned getRotImmOpValue(const MCInst &MI, unsigned Op,
+ SmallVectorImpl<MCFixup> &Fixups) const {
switch (MI.getOperand(Op).getImm()) {
default: assert (0 && "Not a valid rot_imm value!");
case 0: return 0;
}
}
- unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op) const {
+ unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op,
+ SmallVectorImpl<MCFixup> &Fixups) const {
return MI.getOperand(Op).getImm() - 1;
}
- unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op) 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) const;
-
- unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op) const;
- unsigned getAddrMode6RegisterOperand(const MCInst &MI, unsigned Op) const;
- unsigned getAddrMode6OffsetOperand(const MCInst &MI, unsigned Op) const;
-
- unsigned getNumFixupKinds() const {
- assert(0 && "ARMMCCodeEmitter::getNumFixupKinds() not yet implemented.");
- return 0;
- }
-
- const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
- static MCFixupKindInfo rtn;
- assert(0 && "ARMMCCodeEmitter::getFixupKindInfo() not yet implemented.");
- return rtn;
- }
-
- void EmitByte(unsigned char C, unsigned &CurByte, raw_ostream &OS) const {
+ 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 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
+ SmallVectorImpl<MCFixup> &Fixups) const;
+ unsigned getAddrMode6OffsetOpValue(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 VFPThumb2PostEncoder(const MCInst &MI,
+ unsigned EncodedValue) const;
+
+ void EmitByte(unsigned char C, raw_ostream &OS) const {
OS << (char)C;
- ++CurByte;
}
- void EmitConstant(uint64_t Val, unsigned Size, unsigned &CurByte,
- raw_ostream &OS) const {
+ 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, CurByte, OS);
+ EmitByte(Val & 255, OS);
Val >>= 8;
}
}
} // end anonymous namespace
-MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &,
- TargetMachine &TM,
- MCContext &Ctx) {
+MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &, TargetMachine &TM,
+ MCContext &Ctx) {
return new ARMMCCodeEmitter(TM, 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 {
+ const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
+ if (Subtarget.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 {
+ const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
+ if (Subtarget.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 {
+ const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
+ if (Subtarget.isThumb2()) {
+ EncodedValue &= 0x00FFFFFF;
+ EncodedValue |= 0xEE000000;
+ }
+
+ 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 (TM.getSubtarget<ARMSubtarget>().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) const {
+unsigned ARMMCCodeEmitter::
+getMachineOpValue(const MCInst &MI, const MCOperand &MO,
+ SmallVectorImpl<MCFixup> &Fixups) const {
if (MO.isReg()) {
- unsigned regno = getARMRegisterNumbering(MO.getReg());
-
- // Q registers are encodes as 2x their register number.
- switch (MO.getReg()) {
- 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;
- default:
- return regno;
+ unsigned Reg = MO.getReg();
+ unsigned RegNo = getARMRegisterNumbering(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());
- } else {
-#ifndef NDEBUG
- errs() << MO;
-#endif
- llvm_unreachable(0);
}
+
+ llvm_unreachable("Unable to encode MCOperand!");
+ return 0;
+}
+
+/// 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 = getARMRegisterNumbering(MO.getReg());
+
+ int32_t SImm = MO1.getImm();
+ bool isAdd = true;
+
+ // Special value for #-0
+ if (SImm == INT32_MIN)
+ SImm = 0;
+
+ // 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 - Return encoding info for 24-bit immediate
+/// branch target.
+uint32_t ARMMCCodeEmitter::
+getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &Fixups) const {
+ 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(ARM::fixup_arm_branch);
+ Fixups.push_back(MCFixup::Create(0, Expr, Kind));
+
+ // All of the information is in the fixup.
+ return 0;
+}
+
+/// getAdrLabelOpValue - Return encoding info for 12-bit immediate
+/// ADR label target.
+uint32_t ARMMCCodeEmitter::
+getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &Fixups) const {
+ 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(ARM::fixup_arm_pcrel_12);
+ Fixups.push_back(MCFixup::Create(0, Expr, Kind));
+
+ // All of the information is in the fixup.
return 0;
}
-/// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
-/// operand.
-unsigned ARMMCCodeEmitter::getAddrModeImm12OpValue(const MCInst &MI,
- unsigned OpIdx) const {
+/// 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
- const MCOperand &MO = MI.getOperand(OpIdx);
+ 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 = getARMRegisterNumbering(ARM::PC); // Rn is PC.
+ Imm12 = 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_arm_pcrel_12);
+ Fixups.push_back(MCFixup::Create(0, Expr, Kind));
+
+ ++MCNumCPRelocations;
+ } 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;
+}
+
+/// getT2AddrModeImm8s4OpValue - Return encoding info for
+/// 'reg +/- imm8<<2' operand.
+uint32_t ARMMCCodeEmitter::
+getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &Fixups) const {
+ // {17-13} = reg
+ // {12} = (U)nsigned (add == '1', sub == '0')
+ // {11-0} = 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 = getARMRegisterNumbering(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_arm_pcrel_10);
+ Fixups.push_back(MCFixup::Create(0, Expr, Kind));
+
+ ++MCNumCPRelocations;
+ } else
+ isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
+
+ uint32_t Binary = (Imm8 >> 2) & 0xff;
+ // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
+ if (isAdd)
+ Binary |= (1 << 9);
+ Binary |= (Reg << 9);
+ return Binary;
+}
+
+uint32_t ARMMCCodeEmitter::
+getMovtImmOpValue(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()) {
+ return static_cast<unsigned>(MO.getImm());
+ } else if (const MCSymbolRefExpr *Expr =
+ dyn_cast<MCSymbolRefExpr>(MO.getExpr())) {
+ MCFixupKind Kind;
+ switch (Expr->getKind()) {
+ default: assert(0 && "Unsupported ARMFixup");
+ case MCSymbolRefExpr::VK_ARM_HI16:
+ Kind = MCFixupKind(ARM::fixup_arm_movt_hi16);
+ break;
+ case MCSymbolRefExpr::VK_ARM_LO16:
+ Kind = MCFixupKind(ARM::fixup_arm_movw_lo16);
+ break;
+ }
+ Fixups.push_back(MCFixup::Create(0, Expr, Kind));
+ return 0;
+ };
+ llvm_unreachable("Unsupported MCExpr type in MCOperand!");
+ 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 = getARMRegisterNumbering(MO.getReg());
+ unsigned Rm = getARMRegisterNumbering(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);
+
+ // {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 = getARMRegisterNumbering(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 |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
+ }
+ return Binary | (isAdd << 12) | (isReg << 13);
+}
+
+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 = getARMRegisterNumbering(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);
+ unsigned Rn = getARMRegisterNumbering(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 = getARMRegisterNumbering(MO1.getReg());
+ return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
+}
+
+/// getAddrModeSOpValue - Encode the t_addrmode_s# operands.
+static unsigned getAddrModeSOpValue(const MCInst &MI, unsigned OpIdx,
+ unsigned Scale) {
+ // [Rn, Rm]
+ // {5-3} = Rm
+ // {2-0} = Rn
+ //
+ // [Rn, #imm]
+ // {7-3} = imm5
+ // {2-0} = Rn
+ const MCOperand &MO = MI.getOperand(OpIdx);
const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
- uint32_t Binary = 0;
+ const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
+ unsigned Rn = getARMRegisterNumbering(MO.getReg());
+ unsigned Imm5 = (MO1.getImm() / Scale) & 0x1f;
+ unsigned Rm = getARMRegisterNumbering(MO2.getReg());
+ return (Rm << 3) | (Imm5 << 3) | Rn;
+}
+/// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
+uint32_t ARMMCCodeEmitter::
+getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &) const {
+ return getAddrModeSOpValue(MI, OpIdx, 4);
+}
+
+/// getAddrModeS2OpValue - Return encoding for t_addrmode_s2 operands.
+uint32_t ARMMCCodeEmitter::
+getAddrModeS2OpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &) const {
+ return getAddrModeSOpValue(MI, OpIdx, 2);
+}
+
+/// getAddrModeS1OpValue - Return encoding for t_addrmode_s1 operands.
+uint32_t ARMMCCodeEmitter::
+getAddrModeS1OpValue(const MCInst &MI, unsigned OpIdx,
+ SmallVectorImpl<MCFixup> &) const {
+ return getAddrModeSOpValue(MI, OpIdx, 1);
+}
+
+/// 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()) {
- Binary |= ARM::PC << 13; // Rn is PC.
- // FIXME: Add a fixup referencing the label.
- return Binary;
+ Reg = getARMRegisterNumbering(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 = MCFixupKind(ARM::fixup_arm_pcrel_10);
+ Fixups.push_back(MCFixup::Create(0, Expr, Kind));
+
+ ++MCNumCPRelocations;
+ } else {
+ EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
+ isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
}
- unsigned Reg = getARMRegisterNumbering(MO.getReg());
- int32_t Imm12 = MO1.getImm();
- bool isAdd = Imm12 >= 0;
- // Special value for #-0
- if (Imm12 == INT32_MIN)
- Imm12 = 0;
+ uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
// Immediate is always encoded as positive. The 'U' bit controls add vs sub.
- if (Imm12 < 0)
- Imm12 = -Imm12;
- Binary = Imm12 & 0xfff;
if (isAdd)
- Binary |= (1 << 12);
- Binary |= (Reg << 13);
+ Binary |= (1 << 8);
+ Binary |= (Reg << 9);
return Binary;
}
-unsigned ARMMCCodeEmitter::getSORegOpValue(const MCInst &MI,
- unsigned OpIdx) const {
- // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg
- // to be shifted. The second is either Rs, the amount to shift by, or
- // reg0 in which case the imm contains the amount to shift by.
+unsigned ARMMCCodeEmitter::
+getSORegOpValue(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 either Rs, the amount to shift by, or reg0 in which
+ // case the imm contains the amount to shift by.
+ //
// {3-0} = Rm.
- // {4} = 1 if reg shift, 0 if imm shift
+ // {4} = 1 if reg shift, 0 if imm shift
// {6-5} = type
// If reg shift:
- // {7} = 0
// {11-8} = Rs
+ // {7} = 0
// else (imm shift)
// {11-7} = imm
case ARM_AM::ror: SBits = 0x6; break;
}
}
+
Binary |= SBits << 4;
if (SOpc == ARM_AM::rrx)
return Binary;
return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
}
-unsigned ARMMCCodeEmitter::getBitfieldInvertedMaskOpValue(const MCInst &MI,
- unsigned Op) const {
+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 = getARMRegisterNumbering(MO1.getReg());
+ Value <<= 4;
+ Value |= getARMRegisterNumbering(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 = getARMRegisterNumbering(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 = getARMRegisterNumbering(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::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);
return lsb | (msb << 5);
}
-unsigned ARMMCCodeEmitter::getRegisterListOpValue(const MCInst &MI,
- unsigned Op) const {
- // Convert a list of GPRs into a bitfield (R0 -> bit 0). For each
- // register in the list, set the corresponding bit.
+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 = ARM::SPRRegClass.contains(Reg);
+ bool DPRRegs = ARM::DPRRegClass.contains(Reg);
+
unsigned Binary = 0;
- for (unsigned i = Op, e = MI.getNumOperands(); i < e; ++i) {
- unsigned regno = getARMRegisterNumbering(MI.getOperand(i).getReg());
- Binary |= 1 << regno;
+
+ if (SPRRegs || DPRRegs) {
+ // VLDM/VSTM
+ unsigned RegNo = getARMRegisterNumbering(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 = getARMRegisterNumbering(MI.getOperand(I).getReg());
+ Binary |= 1 << RegNo;
+ }
}
+
return Binary;
}
-unsigned ARMMCCodeEmitter::getAddrMode6RegisterOperand(const MCInst &MI,
- unsigned Op) const {
+/// 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);
-
+ const MCOperand &Imm = MI.getOperand(Op + 1);
+
unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
- unsigned Align = Imm.getImm();
- switch(Align) {
- case 8: Align = 0x01; break;
- case 16: Align = 0x02; break;
- case 32: Align = 0x03; break;
- default: Align = 0x00; break;
+ 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);
}
-unsigned ARMMCCodeEmitter::getAddrMode6OffsetOperand(const MCInst &MI,
- unsigned Op) const {
- const MCOperand ®no = MI.getOperand(Op);
- if (regno.getReg() == 0) return 0x0D;
- return regno.getReg();
+/// 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 = getARMRegisterNumbering(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 MO.getReg();
+}
void ARMMCCodeEmitter::
EncodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups) const {
- unsigned Opcode = MI.getOpcode();
- const TargetInstrDesc &Desc = TII.get(Opcode);
- uint64_t TSFlags = Desc.TSFlags;
- // Keep track of the current byte being emitted.
- unsigned CurByte = 0;
-
// Pseudo instructions don't get encoded.
+ const TargetInstrDesc &Desc = TII.get(MI.getOpcode());
+ uint64_t TSFlags = Desc.TSFlags;
if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
return;
-
- ++MCNumEmitted; // Keep track of the # of mi's emitted
- unsigned Value = getBinaryCodeForInstr(MI);
- switch (Opcode) {
- default: break;
+ int Size;
+ // Basic size info comes from the TSFlags field.
+ switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
+ default: llvm_unreachable("Unexpected instruction size!");
+ case ARMII::Size2Bytes: Size = 2; break;
+ case ARMII::Size4Bytes: Size = 4; break;
}
- EmitConstant(Value, 4, CurByte, OS);
+ EmitConstant(getBinaryCodeForInstr(MI, Fixups), Size, OS);
+ ++MCNumEmitted; // Keep track of the # of mi's emitted.
}
-// FIXME: These #defines shouldn't be necessary. Instead, tblgen should
-// be able to generate code emitter helpers for either variant, like it
-// does for the AsmWriter.
-#define ARMCodeEmitter ARMMCCodeEmitter
-#define MachineInstr MCInst
-#include "ARMGenCodeEmitter.inc"
-#undef ARMCodeEmitter
-#undef MachineInstr
+#include "ARMGenMCCodeEmitter.inc"
projects / oota-llvm.git / blobdiff