1 //===-- ARM/ARMMCCodeEmitter.cpp - Convert ARM code to machine code -------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the ARMMCCodeEmitter class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "mccodeemitter"
16 #include "ARMAddressingModes.h"
17 #include "ARMFixupKinds.h"
18 #include "ARMInstrInfo.h"
19 #include "llvm/MC/MCCodeEmitter.h"
20 #include "llvm/MC/MCExpr.h"
21 #include "llvm/MC/MCInst.h"
22 #include "llvm/ADT/Statistic.h"
23 #include "llvm/Support/raw_ostream.h"
26 STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
27 STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
30 class ARMMCCodeEmitter : public MCCodeEmitter {
31 ARMMCCodeEmitter(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
32 void operator=(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
33 const TargetMachine &TM;
34 const TargetInstrInfo &TII;
38 ARMMCCodeEmitter(TargetMachine &tm, MCContext &ctx)
39 : TM(tm), TII(*TM.getInstrInfo()), Ctx(ctx) {
42 ~ARMMCCodeEmitter() {}
44 unsigned getNumFixupKinds() const { return ARM::NumTargetFixupKinds; }
46 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
47 const static MCFixupKindInfo Infos[] = {
48 // name offset bits flags
49 { "fixup_arm_pcrel_12", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
50 { "fixup_arm_pcrel_10", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
51 { "fixup_arm_branch", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
52 { "fixup_arm_movt_hi16", 0, 16, 0 },
53 { "fixup_arm_movw_lo16", 0, 16, 0 },
56 if (Kind < FirstTargetFixupKind)
57 return MCCodeEmitter::getFixupKindInfo(Kind);
59 assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
61 return Infos[Kind - FirstTargetFixupKind];
63 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
65 // getBinaryCodeForInstr - TableGen'erated function for getting the
66 // binary encoding for an instruction.
67 unsigned getBinaryCodeForInstr(const MCInst &MI,
68 SmallVectorImpl<MCFixup> &Fixups) const;
70 /// getMachineOpValue - Return binary encoding of operand. If the machine
71 /// operand requires relocation, record the relocation and return zero.
72 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
73 SmallVectorImpl<MCFixup> &Fixups) const;
75 /// getMovtImmOpValue - Return the encoding for the movw/movt pair
76 uint32_t getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
77 SmallVectorImpl<MCFixup> &Fixups) const;
79 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
80 unsigned &Reg, unsigned &Imm,
81 SmallVectorImpl<MCFixup> &Fixups) const;
83 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
85 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
86 SmallVectorImpl<MCFixup> &Fixups) const;
88 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
90 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
91 SmallVectorImpl<MCFixup> &Fixups) const;
93 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
95 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
96 SmallVectorImpl<MCFixup> &Fixups) const;
98 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
100 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
101 SmallVectorImpl<MCFixup> &Fixups) const;
104 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
105 /// operand as needed by load/store instructions.
106 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
107 SmallVectorImpl<MCFixup> &Fixups) const;
109 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
110 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
111 SmallVectorImpl<MCFixup> &Fixups) const {
112 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
114 default: assert(0 && "Unknown addressing sub-mode!");
115 case ARM_AM::da: return 0;
116 case ARM_AM::ia: return 1;
117 case ARM_AM::db: return 2;
118 case ARM_AM::ib: return 3;
121 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
123 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
125 default: llvm_unreachable("Unknown shift opc!");
126 case ARM_AM::no_shift:
127 case ARM_AM::lsl: return 0;
128 case ARM_AM::lsr: return 1;
129 case ARM_AM::asr: return 2;
131 case ARM_AM::rrx: return 3;
136 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
137 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
138 SmallVectorImpl<MCFixup> &Fixups) const;
140 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
141 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
142 SmallVectorImpl<MCFixup> &Fixups) const;
144 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
145 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
146 SmallVectorImpl<MCFixup> &Fixups) const;
148 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
149 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
150 SmallVectorImpl<MCFixup> &Fixups) const;
152 /// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
153 uint32_t getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
154 SmallVectorImpl<MCFixup> &Fixups) const;
156 /// getAddrModeS2OpValue - Return encoding for t_addrmode_s2 operands.
157 uint32_t getAddrModeS2OpValue(const MCInst &MI, unsigned OpIdx,
158 SmallVectorImpl<MCFixup> &Fixups) const;
160 /// getAddrModeS1OpValue - Return encoding for t_addrmode_s1 operands.
161 uint32_t getAddrModeS1OpValue(const MCInst &MI, unsigned OpIdx,
162 SmallVectorImpl<MCFixup> &Fixups) const;
164 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
165 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
166 SmallVectorImpl<MCFixup> &Fixups) const;
168 /// getCCOutOpValue - Return encoding of the 's' bit.
169 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
170 SmallVectorImpl<MCFixup> &Fixups) const {
171 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
173 return MI.getOperand(Op).getReg() == ARM::CPSR;
176 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
177 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
178 SmallVectorImpl<MCFixup> &Fixups) const {
179 unsigned SoImm = MI.getOperand(Op).getImm();
180 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
181 assert(SoImmVal != -1 && "Not a valid so_imm value!");
183 // Encode rotate_imm.
184 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
185 << ARMII::SoRotImmShift;
188 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
192 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
193 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
194 SmallVectorImpl<MCFixup> &Fixups) const {
195 unsigned SoImm = MI.getOperand(Op).getImm();
196 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
197 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
201 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
202 SmallVectorImpl<MCFixup> &Fixups) const;
203 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
204 SmallVectorImpl<MCFixup> &Fixups) const;
205 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
206 SmallVectorImpl<MCFixup> &Fixups) const;
207 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
208 SmallVectorImpl<MCFixup> &Fixups) const;
210 /// getSORegOpValue - Return an encoded so_reg shifted register value.
211 unsigned getSORegOpValue(const MCInst &MI, unsigned Op,
212 SmallVectorImpl<MCFixup> &Fixups) const;
213 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
214 SmallVectorImpl<MCFixup> &Fixups) const;
216 unsigned getRotImmOpValue(const MCInst &MI, unsigned Op,
217 SmallVectorImpl<MCFixup> &Fixups) const {
218 switch (MI.getOperand(Op).getImm()) {
219 default: assert (0 && "Not a valid rot_imm value!");
227 unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op,
228 SmallVectorImpl<MCFixup> &Fixups) const {
229 return MI.getOperand(Op).getImm() - 1;
232 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
233 SmallVectorImpl<MCFixup> &Fixups) const {
234 return 64 - MI.getOperand(Op).getImm();
237 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
238 SmallVectorImpl<MCFixup> &Fixups) const;
240 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
241 SmallVectorImpl<MCFixup> &Fixups) const;
242 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
243 SmallVectorImpl<MCFixup> &Fixups) const;
244 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
245 SmallVectorImpl<MCFixup> &Fixups) const;
246 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
247 SmallVectorImpl<MCFixup> &Fixups) const;
249 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
250 unsigned EncodedValue) const;
251 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
252 unsigned EncodedValue) const;
253 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
254 unsigned EncodedValue) const;
256 unsigned VFPThumb2PostEncoder(const MCInst &MI,
257 unsigned EncodedValue) const;
259 void EmitByte(unsigned char C, raw_ostream &OS) const {
263 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
264 // Output the constant in little endian byte order.
265 for (unsigned i = 0; i != Size; ++i) {
266 EmitByte(Val & 255, OS);
271 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
272 SmallVectorImpl<MCFixup> &Fixups) const;
275 } // end anonymous namespace
277 MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &, TargetMachine &TM,
279 return new ARMMCCodeEmitter(TM, Ctx);
282 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
283 /// instructions, and rewrite them to their Thumb2 form if we are currently in
285 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
286 unsigned EncodedValue) const {
287 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
288 if (Subtarget.isThumb2()) {
289 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
290 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
292 unsigned Bit24 = EncodedValue & 0x01000000;
293 unsigned Bit28 = Bit24 << 4;
294 EncodedValue &= 0xEFFFFFFF;
295 EncodedValue |= Bit28;
296 EncodedValue |= 0x0F000000;
302 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
303 /// instructions, and rewrite them to their Thumb2 form if we are currently in
305 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
306 unsigned EncodedValue) const {
307 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
308 if (Subtarget.isThumb2()) {
309 EncodedValue &= 0xF0FFFFFF;
310 EncodedValue |= 0x09000000;
316 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
317 /// instructions, and rewrite them to their Thumb2 form if we are currently in
319 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
320 unsigned EncodedValue) const {
321 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
322 if (Subtarget.isThumb2()) {
323 EncodedValue &= 0x00FFFFFF;
324 EncodedValue |= 0xEE000000;
330 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
331 /// them to their Thumb2 form if we are currently in Thumb2 mode.
332 unsigned ARMMCCodeEmitter::
333 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue) const {
334 if (TM.getSubtarget<ARMSubtarget>().isThumb2()) {
335 EncodedValue &= 0x0FFFFFFF;
336 EncodedValue |= 0xE0000000;
341 /// getMachineOpValue - Return binary encoding of operand. If the machine
342 /// operand requires relocation, record the relocation and return zero.
343 unsigned ARMMCCodeEmitter::
344 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
345 SmallVectorImpl<MCFixup> &Fixups) const {
347 unsigned Reg = MO.getReg();
348 unsigned RegNo = getARMRegisterNumbering(Reg);
350 // Q registers are encoded as 2x their register number.
354 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
355 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
356 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
357 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
360 } else if (MO.isImm()) {
361 return static_cast<unsigned>(MO.getImm());
362 } else if (MO.isFPImm()) {
363 return static_cast<unsigned>(APFloat(MO.getFPImm())
364 .bitcastToAPInt().getHiBits(32).getLimitedValue());
367 llvm_unreachable("Unable to encode MCOperand!");
371 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
372 bool ARMMCCodeEmitter::
373 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
374 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
375 const MCOperand &MO = MI.getOperand(OpIdx);
376 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
378 Reg = getARMRegisterNumbering(MO.getReg());
380 int32_t SImm = MO1.getImm();
383 // Special value for #-0
384 if (SImm == INT32_MIN)
387 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
397 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
399 uint32_t ARMMCCodeEmitter::
400 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
401 SmallVectorImpl<MCFixup> &Fixups) const {
402 const MCOperand &MO = MI.getOperand(OpIdx);
404 // If the destination is an immediate, we have nothing to do.
405 if (MO.isImm()) return MO.getImm();
406 assert (MO.isExpr() && "Unexpected branch target type!");
407 const MCExpr *Expr = MO.getExpr();
408 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_branch);
409 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
411 // All of the information is in the fixup.
415 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
416 /// ADR label target.
417 uint32_t ARMMCCodeEmitter::
418 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
419 SmallVectorImpl<MCFixup> &Fixups) const {
420 const MCOperand &MO = MI.getOperand(OpIdx);
422 // If the destination is an immediate, we have nothing to do.
423 if (MO.isImm()) return MO.getImm();
424 assert (MO.isExpr() && "Unexpected branch target type!");
425 const MCExpr *Expr = MO.getExpr();
426 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_12);
427 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
429 // All of the information is in the fixup.
433 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
434 uint32_t ARMMCCodeEmitter::
435 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
436 SmallVectorImpl<MCFixup> &Fixups) const {
438 // {12} = (U)nsigned (add == '1', sub == '0')
442 // If The first operand isn't a register, we have a label reference.
443 const MCOperand &MO = MI.getOperand(OpIdx);
445 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
447 isAdd = false ; // 'U' bit is set as part of the fixup.
449 assert(MO.isExpr() && "Unexpected machine operand type!");
450 const MCExpr *Expr = MO.getExpr();
451 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_12);
452 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
454 ++MCNumCPRelocations;
456 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
458 uint32_t Binary = Imm12 & 0xfff;
459 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
462 Binary |= (Reg << 13);
466 /// getT2AddrModeImm8s4OpValue - Return encoding info for
467 /// 'reg +/- imm8<<2' operand.
468 uint32_t ARMMCCodeEmitter::
469 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
470 SmallVectorImpl<MCFixup> &Fixups) const {
472 // {12} = (U)nsigned (add == '1', sub == '0')
476 // If The first operand isn't a register, we have a label reference.
477 const MCOperand &MO = MI.getOperand(OpIdx);
479 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
481 isAdd = false ; // 'U' bit is set as part of the fixup.
483 assert(MO.isExpr() && "Unexpected machine operand type!");
484 const MCExpr *Expr = MO.getExpr();
485 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
486 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
488 ++MCNumCPRelocations;
490 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
492 uint32_t Binary = (Imm8 >> 2) & 0xff;
493 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
496 Binary |= (Reg << 9);
500 uint32_t ARMMCCodeEmitter::
501 getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
502 SmallVectorImpl<MCFixup> &Fixups) const {
503 // {20-16} = imm{15-12}
504 // {11-0} = imm{11-0}
505 const MCOperand &MO = MI.getOperand(OpIdx);
507 return static_cast<unsigned>(MO.getImm());
508 } else if (const MCSymbolRefExpr *Expr =
509 dyn_cast<MCSymbolRefExpr>(MO.getExpr())) {
511 switch (Expr->getKind()) {
512 default: assert(0 && "Unsupported ARMFixup");
513 case MCSymbolRefExpr::VK_ARM_HI16:
514 Kind = MCFixupKind(ARM::fixup_arm_movt_hi16);
516 case MCSymbolRefExpr::VK_ARM_LO16:
517 Kind = MCFixupKind(ARM::fixup_arm_movw_lo16);
520 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
523 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
527 uint32_t ARMMCCodeEmitter::
528 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
529 SmallVectorImpl<MCFixup> &Fixups) const {
530 const MCOperand &MO = MI.getOperand(OpIdx);
531 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
532 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
533 unsigned Rn = getARMRegisterNumbering(MO.getReg());
534 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
535 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
536 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
537 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
538 unsigned SBits = getShiftOp(ShOp);
547 uint32_t Binary = Rm;
549 Binary |= SBits << 5;
550 Binary |= ShImm << 7;
556 uint32_t ARMMCCodeEmitter::
557 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
558 SmallVectorImpl<MCFixup> &Fixups) const {
560 // {13} 1 == imm12, 0 == Rm
563 const MCOperand &MO = MI.getOperand(OpIdx);
564 unsigned Rn = getARMRegisterNumbering(MO.getReg());
565 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
570 uint32_t ARMMCCodeEmitter::
571 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
572 SmallVectorImpl<MCFixup> &Fixups) const {
573 // {13} 1 == imm12, 0 == Rm
576 const MCOperand &MO = MI.getOperand(OpIdx);
577 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
578 unsigned Imm = MO1.getImm();
579 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
580 bool isReg = MO.getReg() != 0;
581 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
582 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
584 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
585 Binary <<= 7; // Shift amount is bits [11:7]
586 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
587 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
589 return Binary | (isAdd << 12) | (isReg << 13);
592 uint32_t ARMMCCodeEmitter::
593 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
594 SmallVectorImpl<MCFixup> &Fixups) const {
595 // {9} 1 == imm8, 0 == Rm
599 const MCOperand &MO = MI.getOperand(OpIdx);
600 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
601 unsigned Imm = MO1.getImm();
602 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
603 bool isImm = MO.getReg() == 0;
604 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
605 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
607 Imm8 = getARMRegisterNumbering(MO.getReg());
608 return Imm8 | (isAdd << 8) | (isImm << 9);
611 uint32_t ARMMCCodeEmitter::
612 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
613 SmallVectorImpl<MCFixup> &Fixups) const {
614 // {13} 1 == imm8, 0 == Rm
619 const MCOperand &MO = MI.getOperand(OpIdx);
620 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
621 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
622 unsigned Rn = getARMRegisterNumbering(MO.getReg());
623 unsigned Imm = MO2.getImm();
624 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
625 bool isImm = MO1.getReg() == 0;
626 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
627 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
629 Imm8 = getARMRegisterNumbering(MO1.getReg());
630 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
633 /// getAddrModeSOpValue - Encode the t_addrmode_s# operands.
634 static unsigned getAddrModeSOpValue(const MCInst &MI, unsigned OpIdx,
643 const MCOperand &MO = MI.getOperand(OpIdx);
644 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
645 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
646 unsigned Rn = getARMRegisterNumbering(MO.getReg());
647 unsigned Imm5 = (MO1.getImm() / Scale) & 0x1f;
648 unsigned Rm = getARMRegisterNumbering(MO2.getReg());
649 return (Rm << 3) | (Imm5 << 3) | Rn;
652 /// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
653 uint32_t ARMMCCodeEmitter::
654 getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
655 SmallVectorImpl<MCFixup> &) const {
656 return getAddrModeSOpValue(MI, OpIdx, 4);
659 /// getAddrModeS2OpValue - Return encoding for t_addrmode_s2 operands.
660 uint32_t ARMMCCodeEmitter::
661 getAddrModeS2OpValue(const MCInst &MI, unsigned OpIdx,
662 SmallVectorImpl<MCFixup> &) const {
663 return getAddrModeSOpValue(MI, OpIdx, 2);
666 /// getAddrModeS1OpValue - Return encoding for t_addrmode_s1 operands.
667 uint32_t ARMMCCodeEmitter::
668 getAddrModeS1OpValue(const MCInst &MI, unsigned OpIdx,
669 SmallVectorImpl<MCFixup> &) const {
670 return getAddrModeSOpValue(MI, OpIdx, 1);
673 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
674 uint32_t ARMMCCodeEmitter::
675 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
676 SmallVectorImpl<MCFixup> &Fixups) const {
678 // {8} = (U)nsigned (add == '1', sub == '0')
682 // If The first operand isn't a register, we have a label reference.
683 const MCOperand &MO = MI.getOperand(OpIdx);
685 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
687 isAdd = false; // 'U' bit is handled as part of the fixup.
689 assert(MO.isExpr() && "Unexpected machine operand type!");
690 const MCExpr *Expr = MO.getExpr();
691 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
692 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
694 ++MCNumCPRelocations;
696 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
697 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
700 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
701 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
704 Binary |= (Reg << 9);
708 unsigned ARMMCCodeEmitter::
709 getSORegOpValue(const MCInst &MI, unsigned OpIdx,
710 SmallVectorImpl<MCFixup> &Fixups) const {
711 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
712 // shifted. The second is either Rs, the amount to shift by, or reg0 in which
713 // case the imm contains the amount to shift by.
716 // {4} = 1 if reg shift, 0 if imm shift
724 const MCOperand &MO = MI.getOperand(OpIdx);
725 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
726 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
727 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
730 unsigned Binary = getARMRegisterNumbering(MO.getReg());
732 // Encode the shift opcode.
734 unsigned Rs = MO1.getReg();
736 // Set shift operand (bit[7:4]).
741 // RRX - 0110 and bit[11:8] clear.
743 default: llvm_unreachable("Unknown shift opc!");
744 case ARM_AM::lsl: SBits = 0x1; break;
745 case ARM_AM::lsr: SBits = 0x3; break;
746 case ARM_AM::asr: SBits = 0x5; break;
747 case ARM_AM::ror: SBits = 0x7; break;
748 case ARM_AM::rrx: SBits = 0x6; break;
751 // Set shift operand (bit[6:4]).
757 default: llvm_unreachable("Unknown shift opc!");
758 case ARM_AM::lsl: SBits = 0x0; break;
759 case ARM_AM::lsr: SBits = 0x2; break;
760 case ARM_AM::asr: SBits = 0x4; break;
761 case ARM_AM::ror: SBits = 0x6; break;
765 Binary |= SBits << 4;
766 if (SOpc == ARM_AM::rrx)
769 // Encode the shift operation Rs or shift_imm (except rrx).
771 // Encode Rs bit[11:8].
772 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
773 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
776 // Encode shift_imm bit[11:7].
777 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
780 unsigned ARMMCCodeEmitter::
781 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
782 SmallVectorImpl<MCFixup> &Fixups) const {
783 const MCOperand &MO1 = MI.getOperand(OpNum);
784 const MCOperand &MO2 = MI.getOperand(OpNum+1);
785 const MCOperand &MO3 = MI.getOperand(OpNum+2);
787 // Encoded as [Rn, Rm, imm].
788 // FIXME: Needs fixup support.
789 unsigned Value = getARMRegisterNumbering(MO1.getReg());
791 Value |= getARMRegisterNumbering(MO2.getReg());
793 Value |= MO3.getImm();
798 unsigned ARMMCCodeEmitter::
799 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
800 SmallVectorImpl<MCFixup> &Fixups) const {
801 const MCOperand &MO1 = MI.getOperand(OpNum);
802 const MCOperand &MO2 = MI.getOperand(OpNum+1);
804 // FIXME: Needs fixup support.
805 unsigned Value = getARMRegisterNumbering(MO1.getReg());
807 // Even though the immediate is 8 bits long, we need 9 bits in order
808 // to represent the (inverse of the) sign bit.
810 int32_t tmp = (int32_t)MO2.getImm();
814 Value |= 256; // Set the ADD bit
819 unsigned ARMMCCodeEmitter::
820 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
821 SmallVectorImpl<MCFixup> &Fixups) const {
822 const MCOperand &MO1 = MI.getOperand(OpNum);
824 // FIXME: Needs fixup support.
826 int32_t tmp = (int32_t)MO1.getImm();
830 Value |= 256; // Set the ADD bit
835 unsigned ARMMCCodeEmitter::
836 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
837 SmallVectorImpl<MCFixup> &Fixups) const {
838 const MCOperand &MO1 = MI.getOperand(OpNum);
840 // FIXME: Needs fixup support.
842 int32_t tmp = (int32_t)MO1.getImm();
846 Value |= 4096; // Set the ADD bit
851 unsigned ARMMCCodeEmitter::
852 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
853 SmallVectorImpl<MCFixup> &Fixups) const {
854 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
855 // shifted. The second is the amount to shift by.
862 const MCOperand &MO = MI.getOperand(OpIdx);
863 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
864 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
867 unsigned Binary = getARMRegisterNumbering(MO.getReg());
869 // Encode the shift opcode.
871 // Set shift operand (bit[6:4]).
877 default: llvm_unreachable("Unknown shift opc!");
878 case ARM_AM::lsl: SBits = 0x0; break;
879 case ARM_AM::lsr: SBits = 0x2; break;
880 case ARM_AM::asr: SBits = 0x4; break;
881 case ARM_AM::ror: SBits = 0x6; break;
884 Binary |= SBits << 4;
885 if (SOpc == ARM_AM::rrx)
888 // Encode shift_imm bit[11:7].
889 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
892 unsigned ARMMCCodeEmitter::
893 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
894 SmallVectorImpl<MCFixup> &Fixups) const {
895 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
897 const MCOperand &MO = MI.getOperand(Op);
898 uint32_t v = ~MO.getImm();
899 uint32_t lsb = CountTrailingZeros_32(v);
900 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
901 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
902 return lsb | (msb << 5);
905 unsigned ARMMCCodeEmitter::
906 getRegisterListOpValue(const MCInst &MI, unsigned Op,
907 SmallVectorImpl<MCFixup> &Fixups) const {
910 // {7-0} = Number of registers
913 // {15-0} = Bitfield of GPRs.
914 unsigned Reg = MI.getOperand(Op).getReg();
915 bool SPRRegs = ARM::SPRRegClass.contains(Reg);
916 bool DPRRegs = ARM::DPRRegClass.contains(Reg);
920 if (SPRRegs || DPRRegs) {
922 unsigned RegNo = getARMRegisterNumbering(Reg);
923 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
924 Binary |= (RegNo & 0x1f) << 8;
928 Binary |= NumRegs * 2;
930 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
931 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
932 Binary |= 1 << RegNo;
939 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
940 /// with the alignment operand.
941 unsigned ARMMCCodeEmitter::
942 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
943 SmallVectorImpl<MCFixup> &Fixups) const {
944 const MCOperand &Reg = MI.getOperand(Op);
945 const MCOperand &Imm = MI.getOperand(Op + 1);
947 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
950 switch (Imm.getImm()) {
954 case 8: Align = 0x01; break;
955 case 16: Align = 0x02; break;
956 case 32: Align = 0x03; break;
959 return RegNo | (Align << 4);
962 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
963 /// alignment operand for use in VLD-dup instructions. This is the same as
964 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
965 /// different for VLD4-dup.
966 unsigned ARMMCCodeEmitter::
967 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
968 SmallVectorImpl<MCFixup> &Fixups) const {
969 const MCOperand &Reg = MI.getOperand(Op);
970 const MCOperand &Imm = MI.getOperand(Op + 1);
972 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
975 switch (Imm.getImm()) {
979 case 8: Align = 0x01; break;
980 case 16: Align = 0x03; break;
983 return RegNo | (Align << 4);
986 unsigned ARMMCCodeEmitter::
987 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
988 SmallVectorImpl<MCFixup> &Fixups) const {
989 const MCOperand &MO = MI.getOperand(Op);
990 if (MO.getReg() == 0) return 0x0D;
994 void ARMMCCodeEmitter::
995 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
996 SmallVectorImpl<MCFixup> &Fixups) const {
997 // Pseudo instructions don't get encoded.
998 const TargetInstrDesc &Desc = TII.get(MI.getOpcode());
999 uint64_t TSFlags = Desc.TSFlags;
1000 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1003 // Basic size info comes from the TSFlags field.
1004 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
1005 default: llvm_unreachable("Unexpected instruction size!");
1006 case ARMII::Size2Bytes: Size = 2; break;
1007 case ARMII::Size4Bytes: Size = 4; break;
1009 EmitConstant(getBinaryCodeForInstr(MI, Fixups), Size, OS);
1010 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1013 #include "ARMGenMCCodeEmitter.inc"