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 MCFixupKindInfo::FKF_IsAligned},
58 { "fixup_arm_adr_pcrel_12", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
59 { "fixup_arm_branch", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
60 { "fixup_t2_condbranch", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
61 { "fixup_t2_uncondbranch", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
62 { "fixup_arm_thumb_br", 0, 16, MCFixupKindInfo::FKF_IsPCRel },
63 { "fixup_arm_thumb_bl", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
64 { "fixup_arm_thumb_blx", 7, 21, MCFixupKindInfo::FKF_IsPCRel },
65 { "fixup_arm_thumb_cb", 0, 16, MCFixupKindInfo::FKF_IsPCRel },
66 { "fixup_arm_thumb_cp", 1, 8, MCFixupKindInfo::FKF_IsPCRel },
67 { "fixup_arm_thumb_bcc", 1, 8, MCFixupKindInfo::FKF_IsPCRel },
68 { "fixup_arm_movt_hi16", 0, 16, 0 },
69 { "fixup_arm_movw_lo16", 0, 16, 0 },
72 if (Kind < FirstTargetFixupKind)
73 return MCCodeEmitter::getFixupKindInfo(Kind);
75 assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
77 return Infos[Kind - FirstTargetFixupKind];
79 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
81 // getBinaryCodeForInstr - TableGen'erated function for getting the
82 // binary encoding for an instruction.
83 unsigned getBinaryCodeForInstr(const MCInst &MI,
84 SmallVectorImpl<MCFixup> &Fixups) const;
86 /// getMachineOpValue - Return binary encoding of operand. If the machine
87 /// operand requires relocation, record the relocation and return zero.
88 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
89 SmallVectorImpl<MCFixup> &Fixups) const;
91 /// getMovtImmOpValue - Return the encoding for the movw/movt pair
92 uint32_t getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
93 SmallVectorImpl<MCFixup> &Fixups) const;
95 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
96 unsigned &Reg, unsigned &Imm,
97 SmallVectorImpl<MCFixup> &Fixups) const;
99 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
100 /// BL branch target.
101 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
102 SmallVectorImpl<MCFixup> &Fixups) const;
104 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
105 /// BLX branch target.
106 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
107 SmallVectorImpl<MCFixup> &Fixups) const;
109 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
110 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
111 SmallVectorImpl<MCFixup> &Fixups) const;
113 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
114 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
115 SmallVectorImpl<MCFixup> &Fixups) const;
117 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
118 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
119 SmallVectorImpl<MCFixup> &Fixups) const;
121 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
123 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
124 SmallVectorImpl<MCFixup> &Fixups) const;
126 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
127 /// immediate Thumb2 direct branch target.
128 uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
129 SmallVectorImpl<MCFixup> &Fixups) const;
132 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
133 /// ADR label target.
134 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
135 SmallVectorImpl<MCFixup> &Fixups) const;
137 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
139 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
140 SmallVectorImpl<MCFixup> &Fixups) const;
142 /// getTAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
143 uint32_t getTAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
144 SmallVectorImpl<MCFixup> &Fixups) const;
146 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
148 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
149 SmallVectorImpl<MCFixup> &Fixups) const;
152 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
153 /// operand as needed by load/store instructions.
154 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
155 SmallVectorImpl<MCFixup> &Fixups) const;
157 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
158 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
159 SmallVectorImpl<MCFixup> &Fixups) const {
160 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
162 default: assert(0 && "Unknown addressing sub-mode!");
163 case ARM_AM::da: return 0;
164 case ARM_AM::ia: return 1;
165 case ARM_AM::db: return 2;
166 case ARM_AM::ib: return 3;
169 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
171 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
173 default: llvm_unreachable("Unknown shift opc!");
174 case ARM_AM::no_shift:
175 case ARM_AM::lsl: return 0;
176 case ARM_AM::lsr: return 1;
177 case ARM_AM::asr: return 2;
179 case ARM_AM::rrx: return 3;
184 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
185 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
186 SmallVectorImpl<MCFixup> &Fixups) const;
188 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
189 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
190 SmallVectorImpl<MCFixup> &Fixups) const;
192 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
193 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
194 SmallVectorImpl<MCFixup> &Fixups) const;
196 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
197 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
198 SmallVectorImpl<MCFixup> &Fixups) const;
200 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
202 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
203 SmallVectorImpl<MCFixup> &Fixups) const;
205 /// getAddrModeSOpValue - Encode the t_addrmode_s# operands.
206 uint32_t getAddrModeSOpValue(const MCInst &MI, unsigned OpIdx,
207 SmallVectorImpl<MCFixup> &) const;
209 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
210 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
211 SmallVectorImpl<MCFixup> &Fixups) const;
213 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
214 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
215 SmallVectorImpl<MCFixup> &Fixups) const;
217 /// getCCOutOpValue - Return encoding of the 's' bit.
218 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
219 SmallVectorImpl<MCFixup> &Fixups) const {
220 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
222 return MI.getOperand(Op).getReg() == ARM::CPSR;
225 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
226 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
227 SmallVectorImpl<MCFixup> &Fixups) const {
228 unsigned SoImm = MI.getOperand(Op).getImm();
229 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
230 assert(SoImmVal != -1 && "Not a valid so_imm value!");
232 // Encode rotate_imm.
233 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
234 << ARMII::SoRotImmShift;
237 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
241 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
242 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
243 SmallVectorImpl<MCFixup> &Fixups) const {
244 unsigned SoImm = MI.getOperand(Op).getImm();
245 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
246 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
250 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
251 SmallVectorImpl<MCFixup> &Fixups) const;
252 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
253 SmallVectorImpl<MCFixup> &Fixups) const;
254 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
255 SmallVectorImpl<MCFixup> &Fixups) const;
256 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
257 SmallVectorImpl<MCFixup> &Fixups) const;
259 /// getSORegOpValue - Return an encoded so_reg shifted register value.
260 unsigned getSORegOpValue(const MCInst &MI, unsigned Op,
261 SmallVectorImpl<MCFixup> &Fixups) const;
262 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
263 SmallVectorImpl<MCFixup> &Fixups) const;
265 unsigned getRotImmOpValue(const MCInst &MI, unsigned Op,
266 SmallVectorImpl<MCFixup> &Fixups) const {
267 switch (MI.getOperand(Op).getImm()) {
268 default: assert (0 && "Not a valid rot_imm value!");
276 unsigned getImmMinusOneOpValue(const MCInst &MI, unsigned Op,
277 SmallVectorImpl<MCFixup> &Fixups) const {
278 return MI.getOperand(Op).getImm() - 1;
281 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
282 SmallVectorImpl<MCFixup> &Fixups) const {
283 return 64 - MI.getOperand(Op).getImm();
286 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
287 SmallVectorImpl<MCFixup> &Fixups) const;
289 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
290 SmallVectorImpl<MCFixup> &Fixups) const;
291 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
292 SmallVectorImpl<MCFixup> &Fixups) const;
293 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
294 SmallVectorImpl<MCFixup> &Fixups) const;
295 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
296 SmallVectorImpl<MCFixup> &Fixups) const;
298 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
299 unsigned EncodedValue) const;
300 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
301 unsigned EncodedValue) const;
302 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
303 unsigned EncodedValue) const;
305 unsigned VFPThumb2PostEncoder(const MCInst &MI,
306 unsigned EncodedValue) const;
308 void EmitByte(unsigned char C, raw_ostream &OS) const {
312 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
313 // Output the constant in little endian byte order.
314 for (unsigned i = 0; i != Size; ++i) {
315 EmitByte(Val & 255, OS);
320 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
321 SmallVectorImpl<MCFixup> &Fixups) const;
324 } // end anonymous namespace
326 MCCodeEmitter *llvm::createARMMCCodeEmitter(const Target &, TargetMachine &TM,
328 return new ARMMCCodeEmitter(TM, Ctx);
331 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
332 /// instructions, and rewrite them to their Thumb2 form if we are currently in
334 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
335 unsigned EncodedValue) const {
336 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
337 if (Subtarget.isThumb2()) {
338 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
339 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
341 unsigned Bit24 = EncodedValue & 0x01000000;
342 unsigned Bit28 = Bit24 << 4;
343 EncodedValue &= 0xEFFFFFFF;
344 EncodedValue |= Bit28;
345 EncodedValue |= 0x0F000000;
351 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
352 /// instructions, and rewrite them to their Thumb2 form if we are currently in
354 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
355 unsigned EncodedValue) const {
356 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
357 if (Subtarget.isThumb2()) {
358 EncodedValue &= 0xF0FFFFFF;
359 EncodedValue |= 0x09000000;
365 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
366 /// instructions, and rewrite them to their Thumb2 form if we are currently in
368 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
369 unsigned EncodedValue) const {
370 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
371 if (Subtarget.isThumb2()) {
372 EncodedValue &= 0x00FFFFFF;
373 EncodedValue |= 0xEE000000;
379 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
380 /// them to their Thumb2 form if we are currently in Thumb2 mode.
381 unsigned ARMMCCodeEmitter::
382 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue) const {
383 if (TM.getSubtarget<ARMSubtarget>().isThumb2()) {
384 EncodedValue &= 0x0FFFFFFF;
385 EncodedValue |= 0xE0000000;
390 /// getMachineOpValue - Return binary encoding of operand. If the machine
391 /// operand requires relocation, record the relocation and return zero.
392 unsigned ARMMCCodeEmitter::
393 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
394 SmallVectorImpl<MCFixup> &Fixups) const {
396 unsigned Reg = MO.getReg();
397 unsigned RegNo = getARMRegisterNumbering(Reg);
399 // Q registers are encoded as 2x their register number.
403 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
404 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
405 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
406 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
409 } else if (MO.isImm()) {
410 return static_cast<unsigned>(MO.getImm());
411 } else if (MO.isFPImm()) {
412 return static_cast<unsigned>(APFloat(MO.getFPImm())
413 .bitcastToAPInt().getHiBits(32).getLimitedValue());
416 llvm_unreachable("Unable to encode MCOperand!");
420 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
421 bool ARMMCCodeEmitter::
422 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
423 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
424 const MCOperand &MO = MI.getOperand(OpIdx);
425 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
427 Reg = getARMRegisterNumbering(MO.getReg());
429 int32_t SImm = MO1.getImm();
432 // Special value for #-0
433 if (SImm == INT32_MIN)
436 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
446 /// getBranchTargetOpValue - Helper function to get the branch target operand,
447 /// which is either an immediate or requires a fixup.
448 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
450 SmallVectorImpl<MCFixup> &Fixups) {
451 const MCOperand &MO = MI.getOperand(OpIdx);
453 // If the destination is an immediate, we have nothing to do.
454 if (MO.isImm()) return MO.getImm();
455 assert(MO.isExpr() && "Unexpected branch target type!");
456 const MCExpr *Expr = MO.getExpr();
457 MCFixupKind Kind = MCFixupKind(FixupKind);
458 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
460 // All of the information is in the fixup.
464 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
465 uint32_t ARMMCCodeEmitter::
466 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
467 SmallVectorImpl<MCFixup> &Fixups) const {
468 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl, Fixups);
471 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
472 /// BLX branch target.
473 uint32_t ARMMCCodeEmitter::
474 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
475 SmallVectorImpl<MCFixup> &Fixups) const {
476 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx, Fixups);
479 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
480 uint32_t ARMMCCodeEmitter::
481 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
482 SmallVectorImpl<MCFixup> &Fixups) const {
483 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br, Fixups);
486 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
487 uint32_t ARMMCCodeEmitter::
488 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
489 SmallVectorImpl<MCFixup> &Fixups) const {
490 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc, Fixups);
493 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
494 uint32_t ARMMCCodeEmitter::
495 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
496 SmallVectorImpl<MCFixup> &Fixups) const {
497 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups);
500 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
502 uint32_t ARMMCCodeEmitter::
503 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
504 SmallVectorImpl<MCFixup> &Fixups) const {
505 // FIXME: This really, really shouldn't use TargetMachine. We don't want
506 // coupling between MC and TM anywhere we can help it.
507 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
508 if (Subtarget.isThumb2())
510 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups);
511 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_branch, Fixups);
514 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
515 /// immediate branch target.
516 uint32_t ARMMCCodeEmitter::
517 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
518 SmallVectorImpl<MCFixup> &Fixups) const {
520 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups);
521 bool I = (Val & 0x800000);
522 bool J1 = (Val & 0x400000);
523 bool J2 = (Val & 0x200000);
537 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
539 uint32_t ARMMCCodeEmitter::
540 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
541 SmallVectorImpl<MCFixup> &Fixups) const {
542 assert(MI.getOperand(OpIdx).isExpr() && "Unexpected adr target type!");
543 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
547 /// getTAddrModeRegRegOpValue - Return encoding info for 'reg + reg' operand.
548 uint32_t ARMMCCodeEmitter::
549 getTAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
550 SmallVectorImpl<MCFixup> &Fixups) const {
551 const MCOperand &MO1 = MI.getOperand(OpIdx);
552 const MCOperand &MO2 = MI.getOperand(OpIdx+1);
553 unsigned Rn = getARMRegisterNumbering(MO1.getReg());
554 unsigned Rm = getARMRegisterNumbering(MO2.getReg());
555 return (Rm << 3) | Rn;
558 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
559 uint32_t ARMMCCodeEmitter::
560 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
561 SmallVectorImpl<MCFixup> &Fixups) const {
563 // {12} = (U)nsigned (add == '1', sub == '0')
567 // If The first operand isn't a register, we have a label reference.
568 const MCOperand &MO = MI.getOperand(OpIdx);
569 const MCOperand &MO2 = MI.getOperand(OpIdx+1);
570 if (!MO.isReg() || (MO.getReg() == ARM::PC && MO2.isExpr())) {
571 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
573 isAdd = false ; // 'U' bit is set as part of the fixup.
575 const MCExpr *Expr = 0;
579 Expr = MO2.getExpr();
581 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
583 if (Subtarget.isThumb2())
584 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
586 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
587 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
589 ++MCNumCPRelocations;
591 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
593 uint32_t Binary = Imm12 & 0xfff;
594 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
597 Binary |= (Reg << 13);
601 /// getT2AddrModeImm8s4OpValue - Return encoding info for
602 /// 'reg +/- imm8<<2' operand.
603 uint32_t ARMMCCodeEmitter::
604 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
605 SmallVectorImpl<MCFixup> &Fixups) const {
607 // {8} = (U)nsigned (add == '1', sub == '0')
611 // If The first operand isn't a register, we have a label reference.
612 const MCOperand &MO = MI.getOperand(OpIdx);
614 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
616 isAdd = false ; // 'U' bit is set as part of the fixup.
618 assert(MO.isExpr() && "Unexpected machine operand type!");
619 const MCExpr *Expr = MO.getExpr();
620 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
621 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
623 ++MCNumCPRelocations;
625 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
627 uint32_t Binary = (Imm8 >> 2) & 0xff;
628 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
631 Binary |= (Reg << 9);
635 uint32_t ARMMCCodeEmitter::
636 getMovtImmOpValue(const MCInst &MI, unsigned OpIdx,
637 SmallVectorImpl<MCFixup> &Fixups) const {
638 // {20-16} = imm{15-12}
639 // {11-0} = imm{11-0}
640 const MCOperand &MO = MI.getOperand(OpIdx);
642 return static_cast<unsigned>(MO.getImm());
643 } else if (const MCSymbolRefExpr *Expr =
644 dyn_cast<MCSymbolRefExpr>(MO.getExpr())) {
646 switch (Expr->getKind()) {
647 default: assert(0 && "Unsupported ARMFixup");
648 case MCSymbolRefExpr::VK_ARM_HI16:
649 Kind = MCFixupKind(ARM::fixup_arm_movt_hi16);
651 case MCSymbolRefExpr::VK_ARM_LO16:
652 Kind = MCFixupKind(ARM::fixup_arm_movw_lo16);
655 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
658 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
662 uint32_t ARMMCCodeEmitter::
663 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
664 SmallVectorImpl<MCFixup> &Fixups) const {
665 const MCOperand &MO = MI.getOperand(OpIdx);
666 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
667 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
668 unsigned Rn = getARMRegisterNumbering(MO.getReg());
669 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
670 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
671 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
672 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
673 unsigned SBits = getShiftOp(ShOp);
682 uint32_t Binary = Rm;
684 Binary |= SBits << 5;
685 Binary |= ShImm << 7;
691 uint32_t ARMMCCodeEmitter::
692 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
693 SmallVectorImpl<MCFixup> &Fixups) const {
695 // {13} 1 == imm12, 0 == Rm
698 const MCOperand &MO = MI.getOperand(OpIdx);
699 unsigned Rn = getARMRegisterNumbering(MO.getReg());
700 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
705 uint32_t ARMMCCodeEmitter::
706 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
707 SmallVectorImpl<MCFixup> &Fixups) const {
708 // {13} 1 == imm12, 0 == Rm
711 const MCOperand &MO = MI.getOperand(OpIdx);
712 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
713 unsigned Imm = MO1.getImm();
714 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
715 bool isReg = MO.getReg() != 0;
716 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
717 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
719 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
720 Binary <<= 7; // Shift amount is bits [11:7]
721 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
722 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
724 return Binary | (isAdd << 12) | (isReg << 13);
727 uint32_t ARMMCCodeEmitter::
728 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
729 SmallVectorImpl<MCFixup> &Fixups) const {
730 // {9} 1 == imm8, 0 == Rm
734 const MCOperand &MO = MI.getOperand(OpIdx);
735 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
736 unsigned Imm = MO1.getImm();
737 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
738 bool isImm = MO.getReg() == 0;
739 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
740 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
742 Imm8 = getARMRegisterNumbering(MO.getReg());
743 return Imm8 | (isAdd << 8) | (isImm << 9);
746 uint32_t ARMMCCodeEmitter::
747 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
748 SmallVectorImpl<MCFixup> &Fixups) const {
749 // {13} 1 == imm8, 0 == Rm
754 const MCOperand &MO = MI.getOperand(OpIdx);
755 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
756 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
757 unsigned Rn = getARMRegisterNumbering(MO.getReg());
758 unsigned Imm = MO2.getImm();
759 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
760 bool isImm = MO1.getReg() == 0;
761 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
762 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
764 Imm8 = getARMRegisterNumbering(MO1.getReg());
765 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
768 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
769 uint32_t ARMMCCodeEmitter::
770 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
771 SmallVectorImpl<MCFixup> &Fixups) const {
774 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
775 #if 0 // FIXME: This crashes2003-05-14-initialize-string.c
776 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
777 "Unexpected base register!");
779 // The immediate is already shifted for the implicit zeroes, so no change
781 return MO1.getImm() & 0xff;
784 /// getAddrModeSOpValue - Encode the t_addrmode_s# operands.
785 uint32_t ARMMCCodeEmitter::
786 getAddrModeSOpValue(const MCInst &MI, unsigned OpIdx,
787 SmallVectorImpl<MCFixup> &) const {
795 const MCOperand &MO = MI.getOperand(OpIdx);
796 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
797 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
798 unsigned Rn = getARMRegisterNumbering(MO.getReg());
799 unsigned Imm5 = MO1.getImm();
801 if (MO2.getReg() != 0)
803 Imm5 = getARMRegisterNumbering(MO2.getReg());
805 return ((Imm5 & 0x1f) << 3) | Rn;
808 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
809 uint32_t ARMMCCodeEmitter::
810 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
811 SmallVectorImpl<MCFixup> &Fixups) const {
812 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups);
815 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
816 uint32_t ARMMCCodeEmitter::
817 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
818 SmallVectorImpl<MCFixup> &Fixups) const {
820 // {8} = (U)nsigned (add == '1', sub == '0')
824 // If The first operand isn't a register, we have a label reference.
825 const MCOperand &MO = MI.getOperand(OpIdx);
827 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
829 isAdd = false; // 'U' bit is handled as part of the fixup.
831 assert(MO.isExpr() && "Unexpected machine operand type!");
832 const MCExpr *Expr = MO.getExpr();
834 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
835 if (Subtarget.isThumb2())
836 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
838 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
839 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
841 ++MCNumCPRelocations;
843 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
844 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
847 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
848 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
851 Binary |= (Reg << 9);
855 unsigned ARMMCCodeEmitter::
856 getSORegOpValue(const MCInst &MI, unsigned OpIdx,
857 SmallVectorImpl<MCFixup> &Fixups) const {
858 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
859 // shifted. The second is either Rs, the amount to shift by, or reg0 in which
860 // case the imm contains the amount to shift by.
863 // {4} = 1 if reg shift, 0 if imm shift
871 const MCOperand &MO = MI.getOperand(OpIdx);
872 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
873 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
874 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
877 unsigned Binary = getARMRegisterNumbering(MO.getReg());
879 // Encode the shift opcode.
881 unsigned Rs = MO1.getReg();
883 // Set shift operand (bit[7:4]).
888 // RRX - 0110 and bit[11:8] clear.
890 default: llvm_unreachable("Unknown shift opc!");
891 case ARM_AM::lsl: SBits = 0x1; break;
892 case ARM_AM::lsr: SBits = 0x3; break;
893 case ARM_AM::asr: SBits = 0x5; break;
894 case ARM_AM::ror: SBits = 0x7; break;
895 case ARM_AM::rrx: SBits = 0x6; break;
898 // Set shift operand (bit[6:4]).
904 default: llvm_unreachable("Unknown shift opc!");
905 case ARM_AM::lsl: SBits = 0x0; break;
906 case ARM_AM::lsr: SBits = 0x2; break;
907 case ARM_AM::asr: SBits = 0x4; break;
908 case ARM_AM::ror: SBits = 0x6; break;
912 Binary |= SBits << 4;
913 if (SOpc == ARM_AM::rrx)
916 // Encode the shift operation Rs or shift_imm (except rrx).
918 // Encode Rs bit[11:8].
919 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
920 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
923 // Encode shift_imm bit[11:7].
924 return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
927 unsigned ARMMCCodeEmitter::
928 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
929 SmallVectorImpl<MCFixup> &Fixups) const {
930 const MCOperand &MO1 = MI.getOperand(OpNum);
931 const MCOperand &MO2 = MI.getOperand(OpNum+1);
932 const MCOperand &MO3 = MI.getOperand(OpNum+2);
934 // Encoded as [Rn, Rm, imm].
935 // FIXME: Needs fixup support.
936 unsigned Value = getARMRegisterNumbering(MO1.getReg());
938 Value |= getARMRegisterNumbering(MO2.getReg());
940 Value |= MO3.getImm();
945 unsigned ARMMCCodeEmitter::
946 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
947 SmallVectorImpl<MCFixup> &Fixups) const {
948 const MCOperand &MO1 = MI.getOperand(OpNum);
949 const MCOperand &MO2 = MI.getOperand(OpNum+1);
951 // FIXME: Needs fixup support.
952 unsigned Value = getARMRegisterNumbering(MO1.getReg());
954 // Even though the immediate is 8 bits long, we need 9 bits in order
955 // to represent the (inverse of the) sign bit.
957 int32_t tmp = (int32_t)MO2.getImm();
961 Value |= 256; // Set the ADD bit
966 unsigned ARMMCCodeEmitter::
967 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
968 SmallVectorImpl<MCFixup> &Fixups) const {
969 const MCOperand &MO1 = MI.getOperand(OpNum);
971 // FIXME: Needs fixup support.
973 int32_t tmp = (int32_t)MO1.getImm();
977 Value |= 256; // Set the ADD bit
982 unsigned ARMMCCodeEmitter::
983 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
984 SmallVectorImpl<MCFixup> &Fixups) const {
985 const MCOperand &MO1 = MI.getOperand(OpNum);
987 // FIXME: Needs fixup support.
989 int32_t tmp = (int32_t)MO1.getImm();
993 Value |= 4096; // Set the ADD bit
998 unsigned ARMMCCodeEmitter::
999 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1000 SmallVectorImpl<MCFixup> &Fixups) const {
1001 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1002 // shifted. The second is the amount to shift by.
1009 const MCOperand &MO = MI.getOperand(OpIdx);
1010 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1011 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1014 unsigned Binary = getARMRegisterNumbering(MO.getReg());
1016 // Encode the shift opcode.
1018 // Set shift operand (bit[6:4]).
1024 default: llvm_unreachable("Unknown shift opc!");
1025 case ARM_AM::lsl: SBits = 0x0; break;
1026 case ARM_AM::lsr: SBits = 0x2; break;
1027 case ARM_AM::asr: SBits = 0x4; break;
1028 case ARM_AM::ror: SBits = 0x6; break;
1031 Binary |= SBits << 4;
1032 if (SOpc == ARM_AM::rrx)
1035 // Encode shift_imm bit[11:7].
1036 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1039 unsigned ARMMCCodeEmitter::
1040 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1041 SmallVectorImpl<MCFixup> &Fixups) const {
1042 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1044 const MCOperand &MO = MI.getOperand(Op);
1045 uint32_t v = ~MO.getImm();
1046 uint32_t lsb = CountTrailingZeros_32(v);
1047 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
1048 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1049 return lsb | (msb << 5);
1052 unsigned ARMMCCodeEmitter::
1053 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1054 SmallVectorImpl<MCFixup> &Fixups) const {
1057 // {7-0} = Number of registers
1060 // {15-0} = Bitfield of GPRs.
1061 unsigned Reg = MI.getOperand(Op).getReg();
1062 bool SPRRegs = ARM::SPRRegClass.contains(Reg);
1063 bool DPRRegs = ARM::DPRRegClass.contains(Reg);
1065 unsigned Binary = 0;
1067 if (SPRRegs || DPRRegs) {
1069 unsigned RegNo = getARMRegisterNumbering(Reg);
1070 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1071 Binary |= (RegNo & 0x1f) << 8;
1075 Binary |= NumRegs * 2;
1077 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1078 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
1079 Binary |= 1 << RegNo;
1086 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1087 /// with the alignment operand.
1088 unsigned ARMMCCodeEmitter::
1089 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1090 SmallVectorImpl<MCFixup> &Fixups) const {
1091 const MCOperand &Reg = MI.getOperand(Op);
1092 const MCOperand &Imm = MI.getOperand(Op + 1);
1094 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1097 switch (Imm.getImm()) {
1101 case 8: Align = 0x01; break;
1102 case 16: Align = 0x02; break;
1103 case 32: Align = 0x03; break;
1106 return RegNo | (Align << 4);
1109 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1110 /// alignment operand for use in VLD-dup instructions. This is the same as
1111 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1112 /// different for VLD4-dup.
1113 unsigned ARMMCCodeEmitter::
1114 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1115 SmallVectorImpl<MCFixup> &Fixups) const {
1116 const MCOperand &Reg = MI.getOperand(Op);
1117 const MCOperand &Imm = MI.getOperand(Op + 1);
1119 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1122 switch (Imm.getImm()) {
1126 case 8: Align = 0x01; break;
1127 case 16: Align = 0x03; break;
1130 return RegNo | (Align << 4);
1133 unsigned ARMMCCodeEmitter::
1134 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1135 SmallVectorImpl<MCFixup> &Fixups) const {
1136 const MCOperand &MO = MI.getOperand(Op);
1137 if (MO.getReg() == 0) return 0x0D;
1141 void ARMMCCodeEmitter::
1142 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1143 SmallVectorImpl<MCFixup> &Fixups) const {
1144 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
1145 // Pseudo instructions don't get encoded.
1146 const TargetInstrDesc &Desc = TII.get(MI.getOpcode());
1147 uint64_t TSFlags = Desc.TSFlags;
1148 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1151 // Basic size info comes from the TSFlags field.
1152 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
1153 default: llvm_unreachable("Unexpected instruction size!");
1154 case ARMII::Size2Bytes: Size = 2; break;
1155 case ARMII::Size4Bytes: Size = 4; break;
1157 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups);
1158 // Thumb 32-bit wide instructions need to be have the high order halfword
1160 if (Subtarget.isThumb() && Size == 4) {
1161 EmitConstant(Binary >> 16, 2, OS);
1162 EmitConstant(Binary & 0xffff, 2, OS);
1164 EmitConstant(Binary, Size, OS);
1165 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1168 #include "ARMGenMCCodeEmitter.inc"