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 // This table *must* be in the order that the fixup_* kinds are defined in
51 // Name Offset (bits) Size (bits) Flags
52 { "fixup_arm_ldst_pcrel_12", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
53 { "fixup_t2_ldst_pcrel_12", 0, 32, MCFixupKindInfo::FKF_IsPCRel |
54 MCFixupKindInfo::FKF_IsAligned},
55 { "fixup_arm_pcrel_10", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
56 { "fixup_t2_pcrel_10", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
57 { "fixup_arm_adr_pcrel_12", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
58 { "fixup_arm_branch", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
59 { "fixup_t2_branch", 0, 32, MCFixupKindInfo::FKF_IsPCRel |
60 MCFixupKindInfo::FKF_IsAligned},
61 { "fixup_arm_thumb_br", 0, 16, MCFixupKindInfo::FKF_IsPCRel },
62 { "fixup_arm_thumb_bl", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
63 { "fixup_arm_thumb_blx", 7, 21, MCFixupKindInfo::FKF_IsPCRel },
64 { "fixup_arm_thumb_cb", 0, 16, MCFixupKindInfo::FKF_IsPCRel },
65 { "fixup_arm_thumb_cp", 1, 8, MCFixupKindInfo::FKF_IsPCRel },
66 { "fixup_arm_thumb_bcc", 1, 8, MCFixupKindInfo::FKF_IsPCRel },
67 { "fixup_arm_movt_hi16", 0, 16, 0 },
68 { "fixup_arm_movw_lo16", 0, 16, 0 },
71 if (Kind < FirstTargetFixupKind)
72 return MCCodeEmitter::getFixupKindInfo(Kind);
74 assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
76 return Infos[Kind - FirstTargetFixupKind];
78 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
80 // getBinaryCodeForInstr - TableGen'erated function for getting the
81 // binary encoding for an instruction.
82 unsigned getBinaryCodeForInstr(const MCInst &MI,
83 SmallVectorImpl<MCFixup> &Fixups) const;
85 /// getMachineOpValue - Return binary encoding of operand. If the machine
86 /// operand requires relocation, record the relocation and return zero.
87 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
88 SmallVectorImpl<MCFixup> &Fixups) const;
90 /// getMovtImmOpValue - Return the encoding for the movw/movt pair
91 uint32_t getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
92 SmallVectorImpl<MCFixup> &Fixups) const;
94 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
95 unsigned &Reg, unsigned &Imm,
96 SmallVectorImpl<MCFixup> &Fixups) const;
98 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
100 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
101 SmallVectorImpl<MCFixup> &Fixups) const;
103 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
104 /// BLX branch target.
105 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
106 SmallVectorImpl<MCFixup> &Fixups) const;
108 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
109 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
110 SmallVectorImpl<MCFixup> &Fixups) const;
112 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
113 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
114 SmallVectorImpl<MCFixup> &Fixups) const;
116 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
117 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
118 SmallVectorImpl<MCFixup> &Fixups) const;
120 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
122 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
123 SmallVectorImpl<MCFixup> &Fixups) const;
125 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
126 /// ADR label target.
127 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
128 SmallVectorImpl<MCFixup> &Fixups) const;
130 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
132 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
133 SmallVectorImpl<MCFixup> &Fixups) const;
135 /// getTAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
136 uint32_t getTAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
137 SmallVectorImpl<MCFixup> &Fixups) const;
139 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
141 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
142 SmallVectorImpl<MCFixup> &Fixups) const;
145 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
146 /// operand as needed by load/store instructions.
147 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
148 SmallVectorImpl<MCFixup> &Fixups) const;
150 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
151 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
152 SmallVectorImpl<MCFixup> &Fixups) const {
153 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
155 default: assert(0 && "Unknown addressing sub-mode!");
156 case ARM_AM::da: return 0;
157 case ARM_AM::ia: return 1;
158 case ARM_AM::db: return 2;
159 case ARM_AM::ib: return 3;
162 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
164 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
166 default: llvm_unreachable("Unknown shift opc!");
167 case ARM_AM::no_shift:
168 case ARM_AM::lsl: return 0;
169 case ARM_AM::lsr: return 1;
170 case ARM_AM::asr: return 2;
172 case ARM_AM::rrx: return 3;
177 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
178 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
179 SmallVectorImpl<MCFixup> &Fixups) const;
181 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
182 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
183 SmallVectorImpl<MCFixup> &Fixups) const;
185 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
186 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
187 SmallVectorImpl<MCFixup> &Fixups) const;
189 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
190 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
191 SmallVectorImpl<MCFixup> &Fixups) const;
193 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
195 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
196 SmallVectorImpl<MCFixup> &Fixups) const;
198 /// getAddrModeSOpValue - Encode the t_addrmode_s# operands.
199 uint32_t getAddrModeSOpValue(const MCInst &MI, unsigned OpIdx,
200 SmallVectorImpl<MCFixup> &) const;
202 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
203 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
204 SmallVectorImpl<MCFixup> &Fixups) const;
206 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
207 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
208 SmallVectorImpl<MCFixup> &Fixups) const;
210 /// getCCOutOpValue - Return encoding of the 's' bit.
211 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
212 SmallVectorImpl<MCFixup> &Fixups) const {
213 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
215 return MI.getOperand(Op).getReg() == ARM::CPSR;
218 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
219 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
220 SmallVectorImpl<MCFixup> &Fixups) const {
221 unsigned SoImm = MI.getOperand(Op).getImm();
222 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
223 assert(SoImmVal != -1 && "Not a valid so_imm value!");
225 // Encode rotate_imm.
226 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
227 << ARMII::SoRotImmShift;
230 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
234 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
235 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
236 SmallVectorImpl<MCFixup> &Fixups) const {
237 unsigned SoImm = MI.getOperand(Op).getImm();
238 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
239 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
243 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
244 SmallVectorImpl<MCFixup> &Fixups) const;
245 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
246 SmallVectorImpl<MCFixup> &Fixups) const;
247 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
248 SmallVectorImpl<MCFixup> &Fixups) const;
249 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
250 SmallVectorImpl<MCFixup> &Fixups) const;
252 /// getSORegOpValue - Return an encoded so_reg shifted register value.
253 unsigned getSORegOpValue(const MCInst &MI, unsigned Op,
254 SmallVectorImpl<MCFixup> &Fixups) const;
255 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
256 SmallVectorImpl<MCFixup> &Fixups) const;
258 unsigned getRotImmOpValue(const MCInst &MI, unsigned Op,
259 SmallVectorImpl<MCFixup> &Fixups) const {
260 switch (MI.getOperand(Op).getImm()) {
261 default: assert (0 && "Not a valid rot_imm value!");
269 unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op,
270 SmallVectorImpl<MCFixup> &Fixups) const {
271 return MI.getOperand(Op).getImm() - 1;
274 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
275 SmallVectorImpl<MCFixup> &Fixups) const {
276 return 64 - MI.getOperand(Op).getImm();
279 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
280 SmallVectorImpl<MCFixup> &Fixups) const;
282 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
283 SmallVectorImpl<MCFixup> &Fixups) const;
284 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
285 SmallVectorImpl<MCFixup> &Fixups) const;
286 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
287 SmallVectorImpl<MCFixup> &Fixups) const;
288 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
289 SmallVectorImpl<MCFixup> &Fixups) const;
291 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
292 unsigned EncodedValue) const;
293 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
294 unsigned EncodedValue) const;
295 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
296 unsigned EncodedValue) const;
298 unsigned VFPThumb2PostEncoder(const MCInst &MI,
299 unsigned EncodedValue) const;
301 void EmitByte(unsigned char C, raw_ostream &OS) const {
305 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
306 // Output the constant in little endian byte order.
307 for (unsigned i = 0; i != Size; ++i) {
308 EmitByte(Val & 255, OS);
313 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
314 SmallVectorImpl<MCFixup> &Fixups) const;
317 } // end anonymous namespace
319 MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &, TargetMachine &TM,
321 return new ARMMCCodeEmitter(TM, Ctx);
324 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
325 /// instructions, and rewrite them to their Thumb2 form if we are currently in
327 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
328 unsigned EncodedValue) const {
329 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
330 if (Subtarget.isThumb2()) {
331 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
332 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
334 unsigned Bit24 = EncodedValue & 0x01000000;
335 unsigned Bit28 = Bit24 << 4;
336 EncodedValue &= 0xEFFFFFFF;
337 EncodedValue |= Bit28;
338 EncodedValue |= 0x0F000000;
344 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
345 /// instructions, and rewrite them to their Thumb2 form if we are currently in
347 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
348 unsigned EncodedValue) const {
349 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
350 if (Subtarget.isThumb2()) {
351 EncodedValue &= 0xF0FFFFFF;
352 EncodedValue |= 0x09000000;
358 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
359 /// instructions, and rewrite them to their Thumb2 form if we are currently in
361 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
362 unsigned EncodedValue) const {
363 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
364 if (Subtarget.isThumb2()) {
365 EncodedValue &= 0x00FFFFFF;
366 EncodedValue |= 0xEE000000;
372 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
373 /// them to their Thumb2 form if we are currently in Thumb2 mode.
374 unsigned ARMMCCodeEmitter::
375 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue) const {
376 if (TM.getSubtarget<ARMSubtarget>().isThumb2()) {
377 EncodedValue &= 0x0FFFFFFF;
378 EncodedValue |= 0xE0000000;
383 /// getMachineOpValue - Return binary encoding of operand. If the machine
384 /// operand requires relocation, record the relocation and return zero.
385 unsigned ARMMCCodeEmitter::
386 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
387 SmallVectorImpl<MCFixup> &Fixups) const {
389 unsigned Reg = MO.getReg();
390 unsigned RegNo = getARMRegisterNumbering(Reg);
392 // Q registers are encoded as 2x their register number.
396 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
397 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
398 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
399 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
402 } else if (MO.isImm()) {
403 return static_cast<unsigned>(MO.getImm());
404 } else if (MO.isFPImm()) {
405 return static_cast<unsigned>(APFloat(MO.getFPImm())
406 .bitcastToAPInt().getHiBits(32).getLimitedValue());
409 llvm_unreachable("Unable to encode MCOperand!");
413 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
414 bool ARMMCCodeEmitter::
415 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
416 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
417 const MCOperand &MO = MI.getOperand(OpIdx);
418 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
420 Reg = getARMRegisterNumbering(MO.getReg());
422 int32_t SImm = MO1.getImm();
425 // Special value for #-0
426 if (SImm == INT32_MIN)
429 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
439 /// getBranchTargetOpValue - Helper function to get the branch target operand,
440 /// which is either an immediate or requires a fixup.
441 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
443 SmallVectorImpl<MCFixup> &Fixups) {
444 const MCOperand &MO = MI.getOperand(OpIdx);
446 // If the destination is an immediate, we have nothing to do.
447 if (MO.isImm()) return MO.getImm();
448 assert(MO.isExpr() && "Unexpected branch target type!");
449 const MCExpr *Expr = MO.getExpr();
450 MCFixupKind Kind = MCFixupKind(FixupKind);
451 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
453 // All of the information is in the fixup.
457 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
458 uint32_t ARMMCCodeEmitter::
459 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
460 SmallVectorImpl<MCFixup> &Fixups) const {
461 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl, Fixups);
464 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
465 /// BLX branch target.
466 uint32_t ARMMCCodeEmitter::
467 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
468 SmallVectorImpl<MCFixup> &Fixups) const {
469 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx, Fixups);
472 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
473 uint32_t ARMMCCodeEmitter::
474 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
475 SmallVectorImpl<MCFixup> &Fixups) const {
476 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br, Fixups);
479 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
480 uint32_t ARMMCCodeEmitter::
481 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
482 SmallVectorImpl<MCFixup> &Fixups) const {
483 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc, Fixups);
486 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
487 uint32_t ARMMCCodeEmitter::
488 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
489 SmallVectorImpl<MCFixup> &Fixups) const {
490 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups);
493 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
495 uint32_t ARMMCCodeEmitter::
496 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
497 SmallVectorImpl<MCFixup> &Fixups) const {
498 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
499 if (Subtarget.isThumb2())
500 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_branch, Fixups);
501 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_branch, Fixups);
504 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
506 uint32_t ARMMCCodeEmitter::
507 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
508 SmallVectorImpl<MCFixup> &Fixups) const {
509 assert(MI.getOperand(OpIdx).isExpr() && "Unexpected adr target type!");
510 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
514 /// getTAddrModeRegRegOpValue - Return encoding info for 'reg + reg' operand.
515 uint32_t ARMMCCodeEmitter::
516 getTAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
517 SmallVectorImpl<MCFixup> &Fixups) const {
518 const MCOperand &MO1 = MI.getOperand(OpIdx);
519 const MCOperand &MO2 = MI.getOperand(OpIdx+1);
520 unsigned Rn = getARMRegisterNumbering(MO1.getReg());
521 unsigned Rm = getARMRegisterNumbering(MO2.getReg());
522 return (Rm << 3) | Rn;
525 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
526 uint32_t ARMMCCodeEmitter::
527 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
528 SmallVectorImpl<MCFixup> &Fixups) const {
530 // {12} = (U)nsigned (add == '1', sub == '0')
534 // If The first operand isn't a register, we have a label reference.
535 const MCOperand &MO = MI.getOperand(OpIdx);
536 const MCOperand &MO2 = MI.getOperand(OpIdx+1);
537 if (!MO.isReg() || (MO.getReg() == ARM::PC && MO2.isExpr())) {
538 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
540 isAdd = false ; // 'U' bit is set as part of the fixup.
542 const MCExpr *Expr = 0;
546 Expr = MO2.getExpr();
548 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
550 if (Subtarget.isThumb2())
551 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
553 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
554 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
556 ++MCNumCPRelocations;
558 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
560 uint32_t Binary = Imm12 & 0xfff;
561 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
564 Binary |= (Reg << 13);
568 /// getT2AddrModeImm8s4OpValue - Return encoding info for
569 /// 'reg +/- imm8<<2' operand.
570 uint32_t ARMMCCodeEmitter::
571 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
572 SmallVectorImpl<MCFixup> &Fixups) const {
574 // {8} = (U)nsigned (add == '1', sub == '0')
578 // If The first operand isn't a register, we have a label reference.
579 const MCOperand &MO = MI.getOperand(OpIdx);
581 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
583 isAdd = false ; // 'U' bit is set as part of the fixup.
585 assert(MO.isExpr() && "Unexpected machine operand type!");
586 const MCExpr *Expr = MO.getExpr();
587 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
588 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
590 ++MCNumCPRelocations;
592 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
594 uint32_t Binary = (Imm8 >> 2) & 0xff;
595 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
598 Binary |= (Reg << 9);
602 uint32_t ARMMCCodeEmitter::
603 getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
604 SmallVectorImpl<MCFixup> &Fixups) const {
605 // {20-16} = imm{15-12}
606 // {11-0} = imm{11-0}
607 const MCOperand &MO = MI.getOperand(OpIdx);
609 return static_cast<unsigned>(MO.getImm());
610 } else if (const MCSymbolRefExpr *Expr =
611 dyn_cast<MCSymbolRefExpr>(MO.getExpr())) {
613 switch (Expr->getKind()) {
614 default: assert(0 && "Unsupported ARMFixup");
615 case MCSymbolRefExpr::VK_ARM_HI16:
616 Kind = MCFixupKind(ARM::fixup_arm_movt_hi16);
618 case MCSymbolRefExpr::VK_ARM_LO16:
619 Kind = MCFixupKind(ARM::fixup_arm_movw_lo16);
622 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
625 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
629 uint32_t ARMMCCodeEmitter::
630 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
631 SmallVectorImpl<MCFixup> &Fixups) const {
632 const MCOperand &MO = MI.getOperand(OpIdx);
633 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
634 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
635 unsigned Rn = getARMRegisterNumbering(MO.getReg());
636 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
637 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
638 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
639 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
640 unsigned SBits = getShiftOp(ShOp);
649 uint32_t Binary = Rm;
651 Binary |= SBits << 5;
652 Binary |= ShImm << 7;
658 uint32_t ARMMCCodeEmitter::
659 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
660 SmallVectorImpl<MCFixup> &Fixups) const {
662 // {13} 1 == imm12, 0 == Rm
665 const MCOperand &MO = MI.getOperand(OpIdx);
666 unsigned Rn = getARMRegisterNumbering(MO.getReg());
667 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
672 uint32_t ARMMCCodeEmitter::
673 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
674 SmallVectorImpl<MCFixup> &Fixups) const {
675 // {13} 1 == imm12, 0 == Rm
678 const MCOperand &MO = MI.getOperand(OpIdx);
679 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
680 unsigned Imm = MO1.getImm();
681 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
682 bool isReg = MO.getReg() != 0;
683 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
684 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
686 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
687 Binary <<= 7; // Shift amount is bits [11:7]
688 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
689 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
691 return Binary | (isAdd << 12) | (isReg << 13);
694 uint32_t ARMMCCodeEmitter::
695 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
696 SmallVectorImpl<MCFixup> &Fixups) const {
697 // {9} 1 == imm8, 0 == Rm
701 const MCOperand &MO = MI.getOperand(OpIdx);
702 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
703 unsigned Imm = MO1.getImm();
704 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
705 bool isImm = MO.getReg() == 0;
706 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
707 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
709 Imm8 = getARMRegisterNumbering(MO.getReg());
710 return Imm8 | (isAdd << 8) | (isImm << 9);
713 uint32_t ARMMCCodeEmitter::
714 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
715 SmallVectorImpl<MCFixup> &Fixups) const {
716 // {13} 1 == imm8, 0 == Rm
721 const MCOperand &MO = MI.getOperand(OpIdx);
722 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
723 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
724 unsigned Rn = getARMRegisterNumbering(MO.getReg());
725 unsigned Imm = MO2.getImm();
726 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
727 bool isImm = MO1.getReg() == 0;
728 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
729 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
731 Imm8 = getARMRegisterNumbering(MO1.getReg());
732 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
735 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
736 uint32_t ARMMCCodeEmitter::
737 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
738 SmallVectorImpl<MCFixup> &Fixups) const {
741 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
742 #if 0 // FIXME: This crashes2003-05-14-initialize-string.c
743 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
744 "Unexpected base register!");
746 // The immediate is already shifted for the implicit zeroes, so no change
748 return MO1.getImm() & 0xff;
751 /// getAddrModeSOpValue - Encode the t_addrmode_s# operands.
752 uint32_t ARMMCCodeEmitter::
753 getAddrModeSOpValue(const MCInst &MI, unsigned OpIdx,
754 SmallVectorImpl<MCFixup> &) const {
762 const MCOperand &MO = MI.getOperand(OpIdx);
763 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
764 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
765 unsigned Rn = getARMRegisterNumbering(MO.getReg());
766 unsigned Imm5 = MO1.getImm();
768 if (MO2.getReg() != 0)
770 Imm5 = getARMRegisterNumbering(MO2.getReg());
772 return ((Imm5 & 0x1f) << 3) | Rn;
775 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
776 uint32_t ARMMCCodeEmitter::
777 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
778 SmallVectorImpl<MCFixup> &Fixups) const {
779 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups);
782 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
783 uint32_t ARMMCCodeEmitter::
784 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
785 SmallVectorImpl<MCFixup> &Fixups) const {
787 // {8} = (U)nsigned (add == '1', sub == '0')
791 // If The first operand isn't a register, we have a label reference.
792 const MCOperand &MO = MI.getOperand(OpIdx);
794 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
796 isAdd = false; // 'U' bit is handled as part of the fixup.
798 assert(MO.isExpr() && "Unexpected machine operand type!");
799 const MCExpr *Expr = MO.getExpr();
801 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
802 if (Subtarget.isThumb2())
803 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
805 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
806 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
808 ++MCNumCPRelocations;
810 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
811 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
814 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
815 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
818 Binary |= (Reg << 9);
822 unsigned ARMMCCodeEmitter::
823 getSORegOpValue(const MCInst &MI, unsigned OpIdx,
824 SmallVectorImpl<MCFixup> &Fixups) const {
825 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
826 // shifted. The second is either Rs, the amount to shift by, or reg0 in which
827 // case the imm contains the amount to shift by.
830 // {4} = 1 if reg shift, 0 if imm shift
838 const MCOperand &MO = MI.getOperand(OpIdx);
839 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
840 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
841 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
844 unsigned Binary = getARMRegisterNumbering(MO.getReg());
846 // Encode the shift opcode.
848 unsigned Rs = MO1.getReg();
850 // Set shift operand (bit[7:4]).
855 // RRX - 0110 and bit[11:8] clear.
857 default: llvm_unreachable("Unknown shift opc!");
858 case ARM_AM::lsl: SBits = 0x1; break;
859 case ARM_AM::lsr: SBits = 0x3; break;
860 case ARM_AM::asr: SBits = 0x5; break;
861 case ARM_AM::ror: SBits = 0x7; break;
862 case ARM_AM::rrx: SBits = 0x6; break;
865 // Set shift operand (bit[6:4]).
871 default: llvm_unreachable("Unknown shift opc!");
872 case ARM_AM::lsl: SBits = 0x0; break;
873 case ARM_AM::lsr: SBits = 0x2; break;
874 case ARM_AM::asr: SBits = 0x4; break;
875 case ARM_AM::ror: SBits = 0x6; break;
879 Binary |= SBits << 4;
880 if (SOpc == ARM_AM::rrx)
883 // Encode the shift operation Rs or shift_imm (except rrx).
885 // Encode Rs bit[11:8].
886 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
887 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
890 // Encode shift_imm bit[11:7].
891 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
894 unsigned ARMMCCodeEmitter::
895 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
896 SmallVectorImpl<MCFixup> &Fixups) const {
897 const MCOperand &MO1 = MI.getOperand(OpNum);
898 const MCOperand &MO2 = MI.getOperand(OpNum+1);
899 const MCOperand &MO3 = MI.getOperand(OpNum+2);
901 // Encoded as [Rn, Rm, imm].
902 // FIXME: Needs fixup support.
903 unsigned Value = getARMRegisterNumbering(MO1.getReg());
905 Value |= getARMRegisterNumbering(MO2.getReg());
907 Value |= MO3.getImm();
912 unsigned ARMMCCodeEmitter::
913 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
914 SmallVectorImpl<MCFixup> &Fixups) const {
915 const MCOperand &MO1 = MI.getOperand(OpNum);
916 const MCOperand &MO2 = MI.getOperand(OpNum+1);
918 // FIXME: Needs fixup support.
919 unsigned Value = getARMRegisterNumbering(MO1.getReg());
921 // Even though the immediate is 8 bits long, we need 9 bits in order
922 // to represent the (inverse of the) sign bit.
924 int32_t tmp = (int32_t)MO2.getImm();
928 Value |= 256; // Set the ADD bit
933 unsigned ARMMCCodeEmitter::
934 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
935 SmallVectorImpl<MCFixup> &Fixups) const {
936 const MCOperand &MO1 = MI.getOperand(OpNum);
938 // FIXME: Needs fixup support.
940 int32_t tmp = (int32_t)MO1.getImm();
944 Value |= 256; // Set the ADD bit
949 unsigned ARMMCCodeEmitter::
950 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
951 SmallVectorImpl<MCFixup> &Fixups) const {
952 const MCOperand &MO1 = MI.getOperand(OpNum);
954 // FIXME: Needs fixup support.
956 int32_t tmp = (int32_t)MO1.getImm();
960 Value |= 4096; // Set the ADD bit
965 unsigned ARMMCCodeEmitter::
966 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
967 SmallVectorImpl<MCFixup> &Fixups) const {
968 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
969 // shifted. The second is the amount to shift by.
976 const MCOperand &MO = MI.getOperand(OpIdx);
977 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
978 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
981 unsigned Binary = getARMRegisterNumbering(MO.getReg());
983 // Encode the shift opcode.
985 // Set shift operand (bit[6:4]).
991 default: llvm_unreachable("Unknown shift opc!");
992 case ARM_AM::lsl: SBits = 0x0; break;
993 case ARM_AM::lsr: SBits = 0x2; break;
994 case ARM_AM::asr: SBits = 0x4; break;
995 case ARM_AM::ror: SBits = 0x6; break;
998 Binary |= SBits << 4;
999 if (SOpc == ARM_AM::rrx)
1002 // Encode shift_imm bit[11:7].
1003 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1006 unsigned ARMMCCodeEmitter::
1007 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1008 SmallVectorImpl<MCFixup> &Fixups) const {
1009 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1011 const MCOperand &MO = MI.getOperand(Op);
1012 uint32_t v = ~MO.getImm();
1013 uint32_t lsb = CountTrailingZeros_32(v);
1014 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
1015 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1016 return lsb | (msb << 5);
1019 unsigned ARMMCCodeEmitter::
1020 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1021 SmallVectorImpl<MCFixup> &Fixups) const {
1024 // {7-0} = Number of registers
1027 // {15-0} = Bitfield of GPRs.
1028 unsigned Reg = MI.getOperand(Op).getReg();
1029 bool SPRRegs = ARM::SPRRegClass.contains(Reg);
1030 bool DPRRegs = ARM::DPRRegClass.contains(Reg);
1032 unsigned Binary = 0;
1034 if (SPRRegs || DPRRegs) {
1036 unsigned RegNo = getARMRegisterNumbering(Reg);
1037 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1038 Binary |= (RegNo & 0x1f) << 8;
1042 Binary |= NumRegs * 2;
1044 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1045 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
1046 Binary |= 1 << RegNo;
1053 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1054 /// with the alignment operand.
1055 unsigned ARMMCCodeEmitter::
1056 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1057 SmallVectorImpl<MCFixup> &Fixups) const {
1058 const MCOperand &Reg = MI.getOperand(Op);
1059 const MCOperand &Imm = MI.getOperand(Op + 1);
1061 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1064 switch (Imm.getImm()) {
1068 case 8: Align = 0x01; break;
1069 case 16: Align = 0x02; break;
1070 case 32: Align = 0x03; break;
1073 return RegNo | (Align << 4);
1076 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1077 /// alignment operand for use in VLD-dup instructions. This is the same as
1078 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1079 /// different for VLD4-dup.
1080 unsigned ARMMCCodeEmitter::
1081 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1082 SmallVectorImpl<MCFixup> &Fixups) const {
1083 const MCOperand &Reg = MI.getOperand(Op);
1084 const MCOperand &Imm = MI.getOperand(Op + 1);
1086 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1089 switch (Imm.getImm()) {
1093 case 8: Align = 0x01; break;
1094 case 16: Align = 0x03; break;
1097 return RegNo | (Align << 4);
1100 unsigned ARMMCCodeEmitter::
1101 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1102 SmallVectorImpl<MCFixup> &Fixups) const {
1103 const MCOperand &MO = MI.getOperand(Op);
1104 if (MO.getReg() == 0) return 0x0D;
1108 void ARMMCCodeEmitter::
1109 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1110 SmallVectorImpl<MCFixup> &Fixups) const {
1111 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
1112 // Pseudo instructions don't get encoded.
1113 const TargetInstrDesc &Desc = TII.get(MI.getOpcode());
1114 uint64_t TSFlags = Desc.TSFlags;
1115 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1118 // Basic size info comes from the TSFlags field.
1119 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
1120 default: llvm_unreachable("Unexpected instruction size!");
1121 case ARMII::Size2Bytes: Size = 2; break;
1122 case ARMII::Size4Bytes: Size = 4; break;
1124 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups);
1125 // Thumb 32-bit wide instructions need to be have the high order halfword
1127 if (Subtarget.isThumb() && Size == 4) {
1128 EmitConstant(Binary >> 16, 2, OS);
1129 EmitConstant(Binary & 0xffff, 2, OS);
1131 EmitConstant(Binary, Size, OS);
1132 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1135 #include "ARMGenMCCodeEmitter.inc"