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 off bits flags
49 { "fixup_arm_ldst_pcrel_12", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
50 { "fixup_arm_pcrel_10", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
51 { "fixup_arm_adr_pcrel_12", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
52 { "fixup_arm_branch", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
53 { "fixup_arm_thumb_bl", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
54 { "fixup_arm_movt_hi16", 0, 16, 0 },
55 { "fixup_arm_movw_lo16", 0, 16, 0 },
58 if (Kind < FirstTargetFixupKind)
59 return MCCodeEmitter::getFixupKindInfo(Kind);
61 assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
63 return Infos[Kind - FirstTargetFixupKind];
65 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
67 // getBinaryCodeForInstr - TableGen'erated function for getting the
68 // binary encoding for an instruction.
69 unsigned getBinaryCodeForInstr(const MCInst &MI,
70 SmallVectorImpl<MCFixup> &Fixups) const;
72 /// getMachineOpValue - Return binary encoding of operand. If the machine
73 /// operand requires relocation, record the relocation and return zero.
74 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
75 SmallVectorImpl<MCFixup> &Fixups) const;
77 /// getMovtImmOpValue - Return the encoding for the movw/movt pair
78 uint32_t getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
79 SmallVectorImpl<MCFixup> &Fixups) const;
81 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
82 unsigned &Reg, unsigned &Imm,
83 SmallVectorImpl<MCFixup> &Fixups) const;
85 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
87 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
88 SmallVectorImpl<MCFixup> &Fixups) const;
90 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
92 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
93 SmallVectorImpl<MCFixup> &Fixups) const;
95 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
97 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
98 SmallVectorImpl<MCFixup> &Fixups) const;
100 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
102 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
103 SmallVectorImpl<MCFixup> &Fixups) const;
105 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
107 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
108 SmallVectorImpl<MCFixup> &Fixups) const;
111 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
112 /// operand as needed by load/store instructions.
113 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
114 SmallVectorImpl<MCFixup> &Fixups) const;
116 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
117 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
118 SmallVectorImpl<MCFixup> &Fixups) const {
119 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
121 default: assert(0 && "Unknown addressing sub-mode!");
122 case ARM_AM::da: return 0;
123 case ARM_AM::ia: return 1;
124 case ARM_AM::db: return 2;
125 case ARM_AM::ib: return 3;
128 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
130 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
132 default: llvm_unreachable("Unknown shift opc!");
133 case ARM_AM::no_shift:
134 case ARM_AM::lsl: return 0;
135 case ARM_AM::lsr: return 1;
136 case ARM_AM::asr: return 2;
138 case ARM_AM::rrx: return 3;
143 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
144 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
145 SmallVectorImpl<MCFixup> &Fixups) const;
147 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
148 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
149 SmallVectorImpl<MCFixup> &Fixups) const;
151 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
152 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
153 SmallVectorImpl<MCFixup> &Fixups) const;
155 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
156 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
157 SmallVectorImpl<MCFixup> &Fixups) const;
159 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
161 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
162 SmallVectorImpl<MCFixup> &Fixups) const;
164 /// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
165 uint32_t getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
166 SmallVectorImpl<MCFixup> &Fixups) const;
168 /// getAddrModeS2OpValue - Return encoding for t_addrmode_s2 operands.
169 uint32_t getAddrModeS2OpValue(const MCInst &MI, unsigned OpIdx,
170 SmallVectorImpl<MCFixup> &Fixups) const;
172 /// getAddrModeS1OpValue - Return encoding for t_addrmode_s1 operands.
173 uint32_t getAddrModeS1OpValue(const MCInst &MI, unsigned OpIdx,
174 SmallVectorImpl<MCFixup> &Fixups) const;
176 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
177 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
178 SmallVectorImpl<MCFixup> &Fixups) const;
180 /// getCCOutOpValue - Return encoding of the 's' bit.
181 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
182 SmallVectorImpl<MCFixup> &Fixups) const {
183 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
185 return MI.getOperand(Op).getReg() == ARM::CPSR;
188 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
189 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
190 SmallVectorImpl<MCFixup> &Fixups) const {
191 unsigned SoImm = MI.getOperand(Op).getImm();
192 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
193 assert(SoImmVal != -1 && "Not a valid so_imm value!");
195 // Encode rotate_imm.
196 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
197 << ARMII::SoRotImmShift;
200 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
204 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
205 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
206 SmallVectorImpl<MCFixup> &Fixups) const {
207 unsigned SoImm = MI.getOperand(Op).getImm();
208 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
209 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
213 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
214 SmallVectorImpl<MCFixup> &Fixups) const;
215 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
216 SmallVectorImpl<MCFixup> &Fixups) const;
217 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
218 SmallVectorImpl<MCFixup> &Fixups) const;
219 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
220 SmallVectorImpl<MCFixup> &Fixups) const;
222 /// getSORegOpValue - Return an encoded so_reg shifted register value.
223 unsigned getSORegOpValue(const MCInst &MI, unsigned Op,
224 SmallVectorImpl<MCFixup> &Fixups) const;
225 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
226 SmallVectorImpl<MCFixup> &Fixups) const;
228 unsigned getRotImmOpValue(const MCInst &MI, unsigned Op,
229 SmallVectorImpl<MCFixup> &Fixups) const {
230 switch (MI.getOperand(Op).getImm()) {
231 default: assert (0 && "Not a valid rot_imm value!");
239 unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op,
240 SmallVectorImpl<MCFixup> &Fixups) const {
241 return MI.getOperand(Op).getImm() - 1;
244 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
245 SmallVectorImpl<MCFixup> &Fixups) const {
246 return 64 - MI.getOperand(Op).getImm();
249 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
250 SmallVectorImpl<MCFixup> &Fixups) const;
252 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
253 SmallVectorImpl<MCFixup> &Fixups) const;
254 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
255 SmallVectorImpl<MCFixup> &Fixups) const;
256 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
257 SmallVectorImpl<MCFixup> &Fixups) const;
258 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
259 SmallVectorImpl<MCFixup> &Fixups) const;
261 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
262 unsigned EncodedValue) const;
263 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
264 unsigned EncodedValue) const;
265 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
266 unsigned EncodedValue) const;
268 unsigned VFPThumb2PostEncoder(const MCInst &MI,
269 unsigned EncodedValue) const;
271 void EmitByte(unsigned char C, raw_ostream &OS) const {
275 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
276 // Output the constant in little endian byte order.
277 for (unsigned i = 0; i != Size; ++i) {
278 EmitByte(Val & 255, OS);
283 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
284 SmallVectorImpl<MCFixup> &Fixups) const;
287 } // end anonymous namespace
289 MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &, TargetMachine &TM,
291 return new ARMMCCodeEmitter(TM, Ctx);
294 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
295 /// instructions, and rewrite them to their Thumb2 form if we are currently in
297 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
298 unsigned EncodedValue) const {
299 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
300 if (Subtarget.isThumb2()) {
301 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
302 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
304 unsigned Bit24 = EncodedValue & 0x01000000;
305 unsigned Bit28 = Bit24 << 4;
306 EncodedValue &= 0xEFFFFFFF;
307 EncodedValue |= Bit28;
308 EncodedValue |= 0x0F000000;
314 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
315 /// instructions, and rewrite them to their Thumb2 form if we are currently in
317 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
318 unsigned EncodedValue) const {
319 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
320 if (Subtarget.isThumb2()) {
321 EncodedValue &= 0xF0FFFFFF;
322 EncodedValue |= 0x09000000;
328 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
329 /// instructions, and rewrite them to their Thumb2 form if we are currently in
331 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
332 unsigned EncodedValue) const {
333 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
334 if (Subtarget.isThumb2()) {
335 EncodedValue &= 0x00FFFFFF;
336 EncodedValue |= 0xEE000000;
342 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
343 /// them to their Thumb2 form if we are currently in Thumb2 mode.
344 unsigned ARMMCCodeEmitter::
345 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue) const {
346 if (TM.getSubtarget<ARMSubtarget>().isThumb2()) {
347 EncodedValue &= 0x0FFFFFFF;
348 EncodedValue |= 0xE0000000;
353 /// getMachineOpValue - Return binary encoding of operand. If the machine
354 /// operand requires relocation, record the relocation and return zero.
355 unsigned ARMMCCodeEmitter::
356 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
357 SmallVectorImpl<MCFixup> &Fixups) const {
359 unsigned Reg = MO.getReg();
360 unsigned RegNo = getARMRegisterNumbering(Reg);
362 // Q registers are encoded as 2x their register number.
366 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
367 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
368 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
369 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
372 } else if (MO.isImm()) {
373 return static_cast<unsigned>(MO.getImm());
374 } else if (MO.isFPImm()) {
375 return static_cast<unsigned>(APFloat(MO.getFPImm())
376 .bitcastToAPInt().getHiBits(32).getLimitedValue());
379 llvm_unreachable("Unable to encode MCOperand!");
383 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
384 bool ARMMCCodeEmitter::
385 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
386 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
387 const MCOperand &MO = MI.getOperand(OpIdx);
388 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
390 Reg = getARMRegisterNumbering(MO.getReg());
392 int32_t SImm = MO1.getImm();
395 // Special value for #-0
396 if (SImm == INT32_MIN)
399 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
409 /// getThumbBLTargetOpValue - Return encoding info for immediate
411 uint32_t ARMMCCodeEmitter::
412 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
413 SmallVectorImpl<MCFixup> &Fixups) const {
414 const MCOperand &MO = MI.getOperand(OpIdx);
416 // If the destination is an immediate, we have nothing to do.
417 if (MO.isImm()) return MO.getImm();
418 assert (MO.isExpr() && "Unexpected branch target type!");
419 const MCExpr *Expr = MO.getExpr();
420 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_thumb_bl);
421 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
423 // All of the information is in the fixup.
427 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
429 uint32_t ARMMCCodeEmitter::
430 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
431 SmallVectorImpl<MCFixup> &Fixups) const {
432 const MCOperand &MO = MI.getOperand(OpIdx);
434 // If the destination is an immediate, we have nothing to do.
435 if (MO.isImm()) return MO.getImm();
436 assert (MO.isExpr() && "Unexpected branch target type!");
437 const MCExpr *Expr = MO.getExpr();
438 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_branch);
439 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
441 // All of the information is in the fixup.
445 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
446 /// ADR label target.
447 uint32_t ARMMCCodeEmitter::
448 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
449 SmallVectorImpl<MCFixup> &Fixups) const {
450 const MCOperand &MO = MI.getOperand(OpIdx);
451 assert (MO.isExpr() && "Unexpected adr target type!");
452 const MCExpr *Expr = MO.getExpr();
453 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_adr_pcrel_12);
454 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
455 // All of the information is in the fixup.
459 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
460 uint32_t ARMMCCodeEmitter::
461 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
462 SmallVectorImpl<MCFixup> &Fixups) const {
464 // {12} = (U)nsigned (add == '1', sub == '0')
468 // If The first operand isn't a register, we have a label reference.
469 const MCOperand &MO = MI.getOperand(OpIdx);
470 const MCOperand &MO2 = MI.getOperand(OpIdx+1);
471 if (!MO.isReg() || (MO.getReg() == ARM::PC && MO2.isExpr())) {
472 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
474 isAdd = false ; // 'U' bit is set as part of the fixup.
476 const MCExpr *Expr = 0;
480 Expr = MO2.getExpr();
482 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
483 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
485 ++MCNumCPRelocations;
487 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
489 uint32_t Binary = Imm12 & 0xfff;
490 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
493 Binary |= (Reg << 13);
497 /// getT2AddrModeImm8s4OpValue - Return encoding info for
498 /// 'reg +/- imm8<<2' operand.
499 uint32_t ARMMCCodeEmitter::
500 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
501 SmallVectorImpl<MCFixup> &Fixups) const {
503 // {12} = (U)nsigned (add == '1', sub == '0')
507 // If The first operand isn't a register, we have a label reference.
508 const MCOperand &MO = MI.getOperand(OpIdx);
510 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
512 isAdd = false ; // 'U' bit is set as part of the fixup.
514 assert(MO.isExpr() && "Unexpected machine operand type!");
515 const MCExpr *Expr = MO.getExpr();
516 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
517 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
519 ++MCNumCPRelocations;
521 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
523 uint32_t Binary = (Imm8 >> 2) & 0xff;
524 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
527 Binary |= (Reg << 9);
531 uint32_t ARMMCCodeEmitter::
532 getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
533 SmallVectorImpl<MCFixup> &Fixups) const {
534 // {20-16} = imm{15-12}
535 // {11-0} = imm{11-0}
536 const MCOperand &MO = MI.getOperand(OpIdx);
538 return static_cast<unsigned>(MO.getImm());
539 } else if (const MCSymbolRefExpr *Expr =
540 dyn_cast<MCSymbolRefExpr>(MO.getExpr())) {
542 switch (Expr->getKind()) {
543 default: assert(0 && "Unsupported ARMFixup");
544 case MCSymbolRefExpr::VK_ARM_HI16:
545 Kind = MCFixupKind(ARM::fixup_arm_movt_hi16);
547 case MCSymbolRefExpr::VK_ARM_LO16:
548 Kind = MCFixupKind(ARM::fixup_arm_movw_lo16);
551 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
554 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
558 uint32_t ARMMCCodeEmitter::
559 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
560 SmallVectorImpl<MCFixup> &Fixups) const {
561 const MCOperand &MO = MI.getOperand(OpIdx);
562 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
563 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
564 unsigned Rn = getARMRegisterNumbering(MO.getReg());
565 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
566 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
567 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
568 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
569 unsigned SBits = getShiftOp(ShOp);
578 uint32_t Binary = Rm;
580 Binary |= SBits << 5;
581 Binary |= ShImm << 7;
587 uint32_t ARMMCCodeEmitter::
588 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
589 SmallVectorImpl<MCFixup> &Fixups) const {
591 // {13} 1 == imm12, 0 == Rm
594 const MCOperand &MO = MI.getOperand(OpIdx);
595 unsigned Rn = getARMRegisterNumbering(MO.getReg());
596 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
601 uint32_t ARMMCCodeEmitter::
602 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
603 SmallVectorImpl<MCFixup> &Fixups) const {
604 // {13} 1 == imm12, 0 == Rm
607 const MCOperand &MO = MI.getOperand(OpIdx);
608 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
609 unsigned Imm = MO1.getImm();
610 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
611 bool isReg = MO.getReg() != 0;
612 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
613 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
615 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
616 Binary <<= 7; // Shift amount is bits [11:7]
617 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
618 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
620 return Binary | (isAdd << 12) | (isReg << 13);
623 uint32_t ARMMCCodeEmitter::
624 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
625 SmallVectorImpl<MCFixup> &Fixups) const {
626 // {9} 1 == imm8, 0 == Rm
630 const MCOperand &MO = MI.getOperand(OpIdx);
631 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
632 unsigned Imm = MO1.getImm();
633 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
634 bool isImm = MO.getReg() == 0;
635 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
636 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
638 Imm8 = getARMRegisterNumbering(MO.getReg());
639 return Imm8 | (isAdd << 8) | (isImm << 9);
642 uint32_t ARMMCCodeEmitter::
643 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
644 SmallVectorImpl<MCFixup> &Fixups) const {
645 // {13} 1 == imm8, 0 == Rm
650 const MCOperand &MO = MI.getOperand(OpIdx);
651 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
652 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
653 unsigned Rn = getARMRegisterNumbering(MO.getReg());
654 unsigned Imm = MO2.getImm();
655 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
656 bool isImm = MO1.getReg() == 0;
657 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
658 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
660 Imm8 = getARMRegisterNumbering(MO1.getReg());
661 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
664 /// getAddrModeThumbSPOpValue- Encode the t_addrmode_sp operands.
665 uint32_t ARMMCCodeEmitter::
666 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
667 SmallVectorImpl<MCFixup> &Fixups) const {
670 const MCOperand &MO = MI.getOperand(OpIdx);
671 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
672 assert (MO.getReg() == ARM::SP && "Unexpected base register!");
673 // The immediate is already shifted for the implicit zeroes, so no change
675 return MO1.getImm() & 0xff;
678 /// getAddrModeSOpValue - Encode the t_addrmode_s# operands.
679 static unsigned getAddrModeSOpValue(const MCInst &MI, unsigned OpIdx,
688 const MCOperand &MO = MI.getOperand(OpIdx);
689 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
690 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
691 unsigned Rn = getARMRegisterNumbering(MO.getReg());
692 unsigned Imm5 = (MO1.getImm() / Scale) & 0x1f;
694 if (MO2.getReg() != 0)
696 Imm5 = getARMRegisterNumbering(MO2.getReg());
698 return (Imm5 << 3) | Rn;
701 /// getAddrModeS4OpValue - Return encoding for t_addrmode_s4 operands.
702 uint32_t ARMMCCodeEmitter::
703 getAddrModeS4OpValue(const MCInst &MI, unsigned OpIdx,
704 SmallVectorImpl<MCFixup> &) const {
705 return getAddrModeSOpValue(MI, OpIdx, 4);
708 /// getAddrModeS2OpValue - Return encoding for t_addrmode_s2 operands.
709 uint32_t ARMMCCodeEmitter::
710 getAddrModeS2OpValue(const MCInst &MI, unsigned OpIdx,
711 SmallVectorImpl<MCFixup> &) const {
712 return getAddrModeSOpValue(MI, OpIdx, 2);
715 /// getAddrModeS1OpValue - Return encoding for t_addrmode_s1 operands.
716 uint32_t ARMMCCodeEmitter::
717 getAddrModeS1OpValue(const MCInst &MI, unsigned OpIdx,
718 SmallVectorImpl<MCFixup> &) const {
719 return getAddrModeSOpValue(MI, OpIdx, 1);
722 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
723 uint32_t ARMMCCodeEmitter::
724 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
725 SmallVectorImpl<MCFixup> &Fixups) const {
727 // {8} = (U)nsigned (add == '1', sub == '0')
731 // If The first operand isn't a register, we have a label reference.
732 const MCOperand &MO = MI.getOperand(OpIdx);
734 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
736 isAdd = false; // 'U' bit is handled as part of the fixup.
738 assert(MO.isExpr() && "Unexpected machine operand type!");
739 const MCExpr *Expr = MO.getExpr();
740 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
741 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
743 ++MCNumCPRelocations;
745 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
746 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
749 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
750 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
753 Binary |= (Reg << 9);
757 unsigned ARMMCCodeEmitter::
758 getSORegOpValue(const MCInst &MI, unsigned OpIdx,
759 SmallVectorImpl<MCFixup> &Fixups) const {
760 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
761 // shifted. The second is either Rs, the amount to shift by, or reg0 in which
762 // case the imm contains the amount to shift by.
765 // {4} = 1 if reg shift, 0 if imm shift
773 const MCOperand &MO = MI.getOperand(OpIdx);
774 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
775 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
776 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
779 unsigned Binary = getARMRegisterNumbering(MO.getReg());
781 // Encode the shift opcode.
783 unsigned Rs = MO1.getReg();
785 // Set shift operand (bit[7:4]).
790 // RRX - 0110 and bit[11:8] clear.
792 default: llvm_unreachable("Unknown shift opc!");
793 case ARM_AM::lsl: SBits = 0x1; break;
794 case ARM_AM::lsr: SBits = 0x3; break;
795 case ARM_AM::asr: SBits = 0x5; break;
796 case ARM_AM::ror: SBits = 0x7; break;
797 case ARM_AM::rrx: SBits = 0x6; break;
800 // Set shift operand (bit[6:4]).
806 default: llvm_unreachable("Unknown shift opc!");
807 case ARM_AM::lsl: SBits = 0x0; break;
808 case ARM_AM::lsr: SBits = 0x2; break;
809 case ARM_AM::asr: SBits = 0x4; break;
810 case ARM_AM::ror: SBits = 0x6; break;
814 Binary |= SBits << 4;
815 if (SOpc == ARM_AM::rrx)
818 // Encode the shift operation Rs or shift_imm (except rrx).
820 // Encode Rs bit[11:8].
821 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
822 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
825 // Encode shift_imm bit[11:7].
826 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
829 unsigned ARMMCCodeEmitter::
830 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
831 SmallVectorImpl<MCFixup> &Fixups) const {
832 const MCOperand &MO1 = MI.getOperand(OpNum);
833 const MCOperand &MO2 = MI.getOperand(OpNum+1);
834 const MCOperand &MO3 = MI.getOperand(OpNum+2);
836 // Encoded as [Rn, Rm, imm].
837 // FIXME: Needs fixup support.
838 unsigned Value = getARMRegisterNumbering(MO1.getReg());
840 Value |= getARMRegisterNumbering(MO2.getReg());
842 Value |= MO3.getImm();
847 unsigned ARMMCCodeEmitter::
848 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
849 SmallVectorImpl<MCFixup> &Fixups) const {
850 const MCOperand &MO1 = MI.getOperand(OpNum);
851 const MCOperand &MO2 = MI.getOperand(OpNum+1);
853 // FIXME: Needs fixup support.
854 unsigned Value = getARMRegisterNumbering(MO1.getReg());
856 // Even though the immediate is 8 bits long, we need 9 bits in order
857 // to represent the (inverse of the) sign bit.
859 int32_t tmp = (int32_t)MO2.getImm();
863 Value |= 256; // Set the ADD bit
868 unsigned ARMMCCodeEmitter::
869 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
870 SmallVectorImpl<MCFixup> &Fixups) const {
871 const MCOperand &MO1 = MI.getOperand(OpNum);
873 // FIXME: Needs fixup support.
875 int32_t tmp = (int32_t)MO1.getImm();
879 Value |= 256; // Set the ADD bit
884 unsigned ARMMCCodeEmitter::
885 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
886 SmallVectorImpl<MCFixup> &Fixups) const {
887 const MCOperand &MO1 = MI.getOperand(OpNum);
889 // FIXME: Needs fixup support.
891 int32_t tmp = (int32_t)MO1.getImm();
895 Value |= 4096; // Set the ADD bit
900 unsigned ARMMCCodeEmitter::
901 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
902 SmallVectorImpl<MCFixup> &Fixups) const {
903 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
904 // shifted. The second is the amount to shift by.
911 const MCOperand &MO = MI.getOperand(OpIdx);
912 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
913 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
916 unsigned Binary = getARMRegisterNumbering(MO.getReg());
918 // Encode the shift opcode.
920 // Set shift operand (bit[6:4]).
926 default: llvm_unreachable("Unknown shift opc!");
927 case ARM_AM::lsl: SBits = 0x0; break;
928 case ARM_AM::lsr: SBits = 0x2; break;
929 case ARM_AM::asr: SBits = 0x4; break;
930 case ARM_AM::ror: SBits = 0x6; break;
933 Binary |= SBits << 4;
934 if (SOpc == ARM_AM::rrx)
937 // Encode shift_imm bit[11:7].
938 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
941 unsigned ARMMCCodeEmitter::
942 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
943 SmallVectorImpl<MCFixup> &Fixups) const {
944 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
946 const MCOperand &MO = MI.getOperand(Op);
947 uint32_t v = ~MO.getImm();
948 uint32_t lsb = CountTrailingZeros_32(v);
949 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
950 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
951 return lsb | (msb << 5);
954 unsigned ARMMCCodeEmitter::
955 getRegisterListOpValue(const MCInst &MI, unsigned Op,
956 SmallVectorImpl<MCFixup> &Fixups) const {
959 // {7-0} = Number of registers
962 // {15-0} = Bitfield of GPRs.
963 unsigned Reg = MI.getOperand(Op).getReg();
964 bool SPRRegs = ARM::SPRRegClass.contains(Reg);
965 bool DPRRegs = ARM::DPRRegClass.contains(Reg);
969 if (SPRRegs || DPRRegs) {
971 unsigned RegNo = getARMRegisterNumbering(Reg);
972 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
973 Binary |= (RegNo & 0x1f) << 8;
977 Binary |= NumRegs * 2;
979 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
980 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
981 Binary |= 1 << RegNo;
988 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
989 /// with the alignment operand.
990 unsigned ARMMCCodeEmitter::
991 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
992 SmallVectorImpl<MCFixup> &Fixups) const {
993 const MCOperand &Reg = MI.getOperand(Op);
994 const MCOperand &Imm = MI.getOperand(Op + 1);
996 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
999 switch (Imm.getImm()) {
1003 case 8: Align = 0x01; break;
1004 case 16: Align = 0x02; break;
1005 case 32: Align = 0x03; break;
1008 return RegNo | (Align << 4);
1011 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1012 /// alignment operand for use in VLD-dup instructions. This is the same as
1013 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1014 /// different for VLD4-dup.
1015 unsigned ARMMCCodeEmitter::
1016 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1017 SmallVectorImpl<MCFixup> &Fixups) const {
1018 const MCOperand &Reg = MI.getOperand(Op);
1019 const MCOperand &Imm = MI.getOperand(Op + 1);
1021 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1024 switch (Imm.getImm()) {
1028 case 8: Align = 0x01; break;
1029 case 16: Align = 0x03; break;
1032 return RegNo | (Align << 4);
1035 unsigned ARMMCCodeEmitter::
1036 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1037 SmallVectorImpl<MCFixup> &Fixups) const {
1038 const MCOperand &MO = MI.getOperand(Op);
1039 if (MO.getReg() == 0) return 0x0D;
1043 void ARMMCCodeEmitter::
1044 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1045 SmallVectorImpl<MCFixup> &Fixups) const {
1046 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
1047 // Pseudo instructions don't get encoded.
1048 const TargetInstrDesc &Desc = TII.get(MI.getOpcode());
1049 uint64_t TSFlags = Desc.TSFlags;
1050 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1053 // Basic size info comes from the TSFlags field.
1054 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
1055 default: llvm_unreachable("Unexpected instruction size!");
1056 case ARMII::Size2Bytes: Size = 2; break;
1057 case ARMII::Size4Bytes: Size = 4; break;
1059 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups);
1060 // Thumb 32-bit wide instructions need to be have the high order halfword
1062 if (Subtarget.isThumb() && Size == 4) {
1063 EmitConstant(Binary >> 16, 2, OS);
1064 EmitConstant(Binary & 0xffff, 2, OS);
1066 EmitConstant(Binary, Size, OS);
1067 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1070 #include "ARMGenMCCodeEmitter.inc"