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"
15 #include "MCTargetDesc/ARMMCTargetDesc.h"
16 #include "MCTargetDesc/ARMAddressingModes.h"
17 #include "MCTargetDesc/ARMBaseInfo.h"
18 #include "MCTargetDesc/ARMFixupKinds.h"
19 #include "MCTargetDesc/ARMMCExpr.h"
20 #include "llvm/ADT/APFloat.h"
21 #include "llvm/ADT/Statistic.h"
22 #include "llvm/MC/MCCodeEmitter.h"
23 #include "llvm/MC/MCContext.h"
24 #include "llvm/MC/MCExpr.h"
25 #include "llvm/MC/MCInst.h"
26 #include "llvm/MC/MCInstrInfo.h"
27 #include "llvm/MC/MCRegisterInfo.h"
28 #include "llvm/MC/MCSubtargetInfo.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Support/raw_ostream.h"
34 STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
35 STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
38 class ARMMCCodeEmitter : public MCCodeEmitter {
39 ARMMCCodeEmitter(const ARMMCCodeEmitter &) LLVM_DELETED_FUNCTION;
40 void operator=(const ARMMCCodeEmitter &) LLVM_DELETED_FUNCTION;
41 const MCInstrInfo &MCII;
46 ARMMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx, bool IsLittle)
47 : MCII(mcii), CTX(ctx), IsLittleEndian(IsLittle) {
50 ~ARMMCCodeEmitter() {}
52 bool isThumb(const MCSubtargetInfo &STI) const {
53 return (STI.getFeatureBits() & ARM::ModeThumb) != 0;
55 bool isThumb2(const MCSubtargetInfo &STI) const {
56 return isThumb(STI) && (STI.getFeatureBits() & ARM::FeatureThumb2) != 0;
58 bool isTargetMachO(const MCSubtargetInfo &STI) const {
59 Triple TT(STI.getTargetTriple());
60 return TT.isOSBinFormatMachO();
63 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
65 // getBinaryCodeForInstr - TableGen'erated function for getting the
66 // binary encoding for an instruction.
67 uint64_t getBinaryCodeForInstr(const MCInst &MI,
68 SmallVectorImpl<MCFixup> &Fixups,
69 const MCSubtargetInfo &STI) const;
71 /// getMachineOpValue - Return binary encoding of operand. If the machine
72 /// operand requires relocation, record the relocation and return zero.
73 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
74 SmallVectorImpl<MCFixup> &Fixups,
75 const MCSubtargetInfo &STI) const;
77 /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of
78 /// the specified operand. This is used for operands with :lower16: and
79 /// :upper16: prefixes.
80 uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
81 SmallVectorImpl<MCFixup> &Fixups,
82 const MCSubtargetInfo &STI) const;
84 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
85 unsigned &Reg, unsigned &Imm,
86 SmallVectorImpl<MCFixup> &Fixups,
87 const MCSubtargetInfo &STI) const;
89 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
91 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
92 SmallVectorImpl<MCFixup> &Fixups,
93 const MCSubtargetInfo &STI) const;
95 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
96 /// BLX branch target.
97 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
98 SmallVectorImpl<MCFixup> &Fixups,
99 const MCSubtargetInfo &STI) const;
101 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
102 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
103 SmallVectorImpl<MCFixup> &Fixups,
104 const MCSubtargetInfo &STI) const;
106 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
107 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
108 SmallVectorImpl<MCFixup> &Fixups,
109 const MCSubtargetInfo &STI) const;
111 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
112 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
113 SmallVectorImpl<MCFixup> &Fixups,
114 const MCSubtargetInfo &STI) const;
116 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
118 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
119 SmallVectorImpl<MCFixup> &Fixups,
120 const MCSubtargetInfo &STI) const;
122 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
123 /// immediate Thumb2 direct branch target.
124 uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
125 SmallVectorImpl<MCFixup> &Fixups,
126 const MCSubtargetInfo &STI) const;
128 /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate
130 uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
131 SmallVectorImpl<MCFixup> &Fixups,
132 const MCSubtargetInfo &STI) const;
133 uint32_t getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
134 SmallVectorImpl<MCFixup> &Fixups,
135 const MCSubtargetInfo &STI) const;
136 uint32_t getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
137 SmallVectorImpl<MCFixup> &Fixups,
138 const MCSubtargetInfo &STI) const;
140 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
141 /// ADR label target.
142 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
143 SmallVectorImpl<MCFixup> &Fixups,
144 const MCSubtargetInfo &STI) const;
145 uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
146 SmallVectorImpl<MCFixup> &Fixups,
147 const MCSubtargetInfo &STI) const;
148 uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
149 SmallVectorImpl<MCFixup> &Fixups,
150 const MCSubtargetInfo &STI) const;
153 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
155 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
156 SmallVectorImpl<MCFixup> &Fixups,
157 const MCSubtargetInfo &STI) const;
159 /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
160 uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
161 SmallVectorImpl<MCFixup> &Fixups,
162 const MCSubtargetInfo &STI) const;
164 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
166 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
167 SmallVectorImpl<MCFixup> &Fixups,
168 const MCSubtargetInfo &STI) const;
170 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for 'reg + imm8<<2'
172 uint32_t getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
173 SmallVectorImpl<MCFixup> &Fixups,
174 const MCSubtargetInfo &STI) const;
176 /// getT2Imm8s4OpValue - Return encoding info for '+/- imm8<<2'
178 uint32_t getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
179 SmallVectorImpl<MCFixup> &Fixups,
180 const MCSubtargetInfo &STI) const;
183 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
184 /// operand as needed by load/store instructions.
185 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
186 SmallVectorImpl<MCFixup> &Fixups,
187 const MCSubtargetInfo &STI) const;
189 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
190 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
191 SmallVectorImpl<MCFixup> &Fixups,
192 const MCSubtargetInfo &STI) const {
193 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
195 default: llvm_unreachable("Unknown addressing sub-mode!");
196 case ARM_AM::da: return 0;
197 case ARM_AM::ia: return 1;
198 case ARM_AM::db: return 2;
199 case ARM_AM::ib: return 3;
202 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
204 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
206 case ARM_AM::no_shift:
207 case ARM_AM::lsl: return 0;
208 case ARM_AM::lsr: return 1;
209 case ARM_AM::asr: return 2;
211 case ARM_AM::rrx: return 3;
213 llvm_unreachable("Invalid ShiftOpc!");
216 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
217 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
218 SmallVectorImpl<MCFixup> &Fixups,
219 const MCSubtargetInfo &STI) const;
221 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
222 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
223 SmallVectorImpl<MCFixup> &Fixups,
224 const MCSubtargetInfo &STI) const;
226 /// getPostIdxRegOpValue - Return encoding for postidx_reg operands.
227 uint32_t getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
228 SmallVectorImpl<MCFixup> &Fixups,
229 const MCSubtargetInfo &STI) const;
231 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
232 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
233 SmallVectorImpl<MCFixup> &Fixups,
234 const MCSubtargetInfo &STI) const;
236 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
237 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
238 SmallVectorImpl<MCFixup> &Fixups,
239 const MCSubtargetInfo &STI) const;
241 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
243 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
244 SmallVectorImpl<MCFixup> &Fixups,
245 const MCSubtargetInfo &STI) const;
247 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
248 uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
249 SmallVectorImpl<MCFixup> &Fixups,
250 const MCSubtargetInfo &STI) const;
252 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
253 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
254 SmallVectorImpl<MCFixup> &Fixups,
255 const MCSubtargetInfo &STI) const;
257 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
258 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
259 SmallVectorImpl<MCFixup> &Fixups,
260 const MCSubtargetInfo &STI) const;
262 /// getCCOutOpValue - Return encoding of the 's' bit.
263 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
264 SmallVectorImpl<MCFixup> &Fixups,
265 const MCSubtargetInfo &STI) const {
266 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
268 return MI.getOperand(Op).getReg() == ARM::CPSR;
271 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
272 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
273 SmallVectorImpl<MCFixup> &Fixups,
274 const MCSubtargetInfo &STI) const {
276 const MCOperand &MO = MI.getOperand(Op);
278 // We expect MO to be an immediate or an expression,
279 // if it is an immediate - that's fine, just encode the value.
280 // Otherwise - create a Fixup.
282 const MCExpr *Expr = MO.getExpr();
283 // In instruction code this value always encoded as lowest 12 bits,
284 // so we don't have to perform any specific adjustments.
285 // Due to requirements of relocatable records we have to use FK_Data_4.
286 // See ARMELFObjectWriter::ExplicitRelSym and
287 // ARMELFObjectWriter::GetRelocTypeInner for more details.
288 MCFixupKind Kind = MCFixupKind(FK_Data_4);
289 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
293 unsigned SoImm = MO.getImm();
294 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
295 assert(SoImmVal != -1 && "Not a valid so_imm value!");
297 // Encode rotate_imm.
298 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
299 << ARMII::SoRotImmShift;
302 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
306 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
307 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
308 SmallVectorImpl<MCFixup> &Fixups,
309 const MCSubtargetInfo &STI) const {
310 unsigned SoImm = MI.getOperand(Op).getImm();
311 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
312 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
316 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
317 SmallVectorImpl<MCFixup> &Fixups,
318 const MCSubtargetInfo &STI) const;
319 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
320 SmallVectorImpl<MCFixup> &Fixups,
321 const MCSubtargetInfo &STI) const;
322 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
323 SmallVectorImpl<MCFixup> &Fixups,
324 const MCSubtargetInfo &STI) const;
325 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
326 SmallVectorImpl<MCFixup> &Fixups,
327 const MCSubtargetInfo &STI) const;
329 /// getSORegOpValue - Return an encoded so_reg shifted register value.
330 unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op,
331 SmallVectorImpl<MCFixup> &Fixups,
332 const MCSubtargetInfo &STI) const;
333 unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op,
334 SmallVectorImpl<MCFixup> &Fixups,
335 const MCSubtargetInfo &STI) const;
336 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
337 SmallVectorImpl<MCFixup> &Fixups,
338 const MCSubtargetInfo &STI) const;
340 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
341 SmallVectorImpl<MCFixup> &Fixups,
342 const MCSubtargetInfo &STI) const {
343 return 64 - MI.getOperand(Op).getImm();
346 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
347 SmallVectorImpl<MCFixup> &Fixups,
348 const MCSubtargetInfo &STI) const;
350 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
351 SmallVectorImpl<MCFixup> &Fixups,
352 const MCSubtargetInfo &STI) const;
353 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
354 SmallVectorImpl<MCFixup> &Fixups,
355 const MCSubtargetInfo &STI) const;
356 unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
357 SmallVectorImpl<MCFixup> &Fixups,
358 const MCSubtargetInfo &STI) const;
359 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
360 SmallVectorImpl<MCFixup> &Fixups,
361 const MCSubtargetInfo &STI) const;
362 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
363 SmallVectorImpl<MCFixup> &Fixups,
364 const MCSubtargetInfo &STI) const;
366 unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op,
367 SmallVectorImpl<MCFixup> &Fixups,
368 const MCSubtargetInfo &STI) const;
369 unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op,
370 SmallVectorImpl<MCFixup> &Fixups,
371 const MCSubtargetInfo &STI) const;
372 unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op,
373 SmallVectorImpl<MCFixup> &Fixups,
374 const MCSubtargetInfo &STI) const;
375 unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op,
376 SmallVectorImpl<MCFixup> &Fixups,
377 const MCSubtargetInfo &STI) const;
379 unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op,
380 SmallVectorImpl<MCFixup> &Fixups,
381 const MCSubtargetInfo &STI) const;
383 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
384 unsigned EncodedValue,
385 const MCSubtargetInfo &STI) const;
386 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
387 unsigned EncodedValue,
388 const MCSubtargetInfo &STI) const;
389 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
390 unsigned EncodedValue,
391 const MCSubtargetInfo &STI) const;
392 unsigned NEONThumb2V8PostEncoder(const MCInst &MI,
393 unsigned EncodedValue,
394 const MCSubtargetInfo &STI) const;
396 unsigned VFPThumb2PostEncoder(const MCInst &MI,
397 unsigned EncodedValue,
398 const MCSubtargetInfo &STI) const;
400 void EmitByte(unsigned char C, raw_ostream &OS) const {
404 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
405 // Output the constant in little endian byte order.
406 for (unsigned i = 0; i != Size; ++i) {
407 unsigned Shift = IsLittleEndian ? i * 8 : (Size - 1 - i) * 8;
408 EmitByte((Val >> Shift) & 0xff, OS);
412 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
413 SmallVectorImpl<MCFixup> &Fixups,
414 const MCSubtargetInfo &STI) const override;
417 } // end anonymous namespace
419 MCCodeEmitter *llvm::createARMLEMCCodeEmitter(const MCInstrInfo &MCII,
420 const MCRegisterInfo &MRI,
421 const MCSubtargetInfo &STI,
423 return new ARMMCCodeEmitter(MCII, Ctx, true);
426 MCCodeEmitter *llvm::createARMBEMCCodeEmitter(const MCInstrInfo &MCII,
427 const MCRegisterInfo &MRI,
428 const MCSubtargetInfo &STI,
430 return new ARMMCCodeEmitter(MCII, Ctx, false);
433 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
434 /// instructions, and rewrite them to their Thumb2 form if we are currently in
436 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
437 unsigned EncodedValue,
438 const MCSubtargetInfo &STI) const {
440 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
441 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
443 unsigned Bit24 = EncodedValue & 0x01000000;
444 unsigned Bit28 = Bit24 << 4;
445 EncodedValue &= 0xEFFFFFFF;
446 EncodedValue |= Bit28;
447 EncodedValue |= 0x0F000000;
453 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
454 /// instructions, and rewrite them to their Thumb2 form if we are currently in
456 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
457 unsigned EncodedValue,
458 const MCSubtargetInfo &STI) const {
460 EncodedValue &= 0xF0FFFFFF;
461 EncodedValue |= 0x09000000;
467 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
468 /// instructions, and rewrite them to their Thumb2 form if we are currently in
470 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
471 unsigned EncodedValue,
472 const MCSubtargetInfo &STI) const {
474 EncodedValue &= 0x00FFFFFF;
475 EncodedValue |= 0xEE000000;
481 /// Post-process encoded NEON v8 instructions, and rewrite them to Thumb2 form
482 /// if we are in Thumb2.
483 unsigned ARMMCCodeEmitter::NEONThumb2V8PostEncoder(const MCInst &MI,
484 unsigned EncodedValue,
485 const MCSubtargetInfo &STI) const {
487 EncodedValue |= 0xC000000; // Set bits 27-26
493 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
494 /// them to their Thumb2 form if we are currently in Thumb2 mode.
495 unsigned ARMMCCodeEmitter::
496 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue,
497 const MCSubtargetInfo &STI) const {
499 EncodedValue &= 0x0FFFFFFF;
500 EncodedValue |= 0xE0000000;
505 /// getMachineOpValue - Return binary encoding of operand. If the machine
506 /// operand requires relocation, record the relocation and return zero.
507 unsigned ARMMCCodeEmitter::
508 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
509 SmallVectorImpl<MCFixup> &Fixups,
510 const MCSubtargetInfo &STI) const {
512 unsigned Reg = MO.getReg();
513 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
515 // Q registers are encoded as 2x their register number.
519 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
520 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
521 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
522 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
525 } else if (MO.isImm()) {
526 return static_cast<unsigned>(MO.getImm());
527 } else if (MO.isFPImm()) {
528 return static_cast<unsigned>(APFloat(MO.getFPImm())
529 .bitcastToAPInt().getHiBits(32).getLimitedValue());
532 llvm_unreachable("Unable to encode MCOperand!");
535 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
536 bool ARMMCCodeEmitter::
537 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
538 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups,
539 const MCSubtargetInfo &STI) const {
540 const MCOperand &MO = MI.getOperand(OpIdx);
541 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
543 Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
545 int32_t SImm = MO1.getImm();
548 // Special value for #-0
549 if (SImm == INT32_MIN) {
554 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
564 /// getBranchTargetOpValue - Helper function to get the branch target operand,
565 /// which is either an immediate or requires a fixup.
566 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
568 SmallVectorImpl<MCFixup> &Fixups,
569 const MCSubtargetInfo &STI) {
570 const MCOperand &MO = MI.getOperand(OpIdx);
572 // If the destination is an immediate, we have nothing to do.
573 if (MO.isImm()) return MO.getImm();
574 assert(MO.isExpr() && "Unexpected branch target type!");
575 const MCExpr *Expr = MO.getExpr();
576 MCFixupKind Kind = MCFixupKind(FixupKind);
577 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
579 // All of the information is in the fixup.
583 // Thumb BL and BLX use a strange offset encoding where bits 22 and 21 are
584 // determined by negating them and XOR'ing them with bit 23.
585 static int32_t encodeThumbBLOffset(int32_t offset) {
587 uint32_t S = (offset & 0x800000) >> 23;
588 uint32_t J1 = (offset & 0x400000) >> 22;
589 uint32_t J2 = (offset & 0x200000) >> 21;
602 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
603 uint32_t ARMMCCodeEmitter::
604 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
605 SmallVectorImpl<MCFixup> &Fixups,
606 const MCSubtargetInfo &STI) const {
607 const MCOperand MO = MI.getOperand(OpIdx);
609 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl,
611 return encodeThumbBLOffset(MO.getImm());
614 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
615 /// BLX branch target.
616 uint32_t ARMMCCodeEmitter::
617 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
618 SmallVectorImpl<MCFixup> &Fixups,
619 const MCSubtargetInfo &STI) const {
620 const MCOperand MO = MI.getOperand(OpIdx);
622 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx,
624 return encodeThumbBLOffset(MO.getImm());
627 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
628 uint32_t ARMMCCodeEmitter::
629 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
630 SmallVectorImpl<MCFixup> &Fixups,
631 const MCSubtargetInfo &STI) const {
632 const MCOperand MO = MI.getOperand(OpIdx);
634 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br,
636 return (MO.getImm() >> 1);
639 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
640 uint32_t ARMMCCodeEmitter::
641 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
642 SmallVectorImpl<MCFixup> &Fixups,
643 const MCSubtargetInfo &STI) const {
644 const MCOperand MO = MI.getOperand(OpIdx);
646 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc,
648 return (MO.getImm() >> 1);
651 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
652 uint32_t ARMMCCodeEmitter::
653 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
654 SmallVectorImpl<MCFixup> &Fixups,
655 const MCSubtargetInfo &STI) const {
656 const MCOperand MO = MI.getOperand(OpIdx);
658 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups, STI);
659 return (MO.getImm() >> 1);
662 /// Return true if this branch has a non-always predication
663 static bool HasConditionalBranch(const MCInst &MI) {
664 int NumOp = MI.getNumOperands();
666 for (int i = 0; i < NumOp-1; ++i) {
667 const MCOperand &MCOp1 = MI.getOperand(i);
668 const MCOperand &MCOp2 = MI.getOperand(i + 1);
669 if (MCOp1.isImm() && MCOp2.isReg() &&
670 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
671 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
679 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
681 uint32_t ARMMCCodeEmitter::
682 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
683 SmallVectorImpl<MCFixup> &Fixups,
684 const MCSubtargetInfo &STI) const {
685 // FIXME: This really, really shouldn't use TargetMachine. We don't want
686 // coupling between MC and TM anywhere we can help it.
689 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups, STI);
690 return getARMBranchTargetOpValue(MI, OpIdx, Fixups, STI);
693 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
695 uint32_t ARMMCCodeEmitter::
696 getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
697 SmallVectorImpl<MCFixup> &Fixups,
698 const MCSubtargetInfo &STI) const {
699 const MCOperand MO = MI.getOperand(OpIdx);
701 if (HasConditionalBranch(MI))
702 return ::getBranchTargetOpValue(MI, OpIdx,
703 ARM::fixup_arm_condbranch, Fixups, STI);
704 return ::getBranchTargetOpValue(MI, OpIdx,
705 ARM::fixup_arm_uncondbranch, Fixups, STI);
708 return MO.getImm() >> 2;
711 uint32_t ARMMCCodeEmitter::
712 getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
713 SmallVectorImpl<MCFixup> &Fixups,
714 const MCSubtargetInfo &STI) const {
715 const MCOperand MO = MI.getOperand(OpIdx);
717 if (HasConditionalBranch(MI))
718 return ::getBranchTargetOpValue(MI, OpIdx,
719 ARM::fixup_arm_condbl, Fixups, STI);
720 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_uncondbl, Fixups, STI);
723 return MO.getImm() >> 2;
726 uint32_t ARMMCCodeEmitter::
727 getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
728 SmallVectorImpl<MCFixup> &Fixups,
729 const MCSubtargetInfo &STI) const {
730 const MCOperand MO = MI.getOperand(OpIdx);
732 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_blx, Fixups, STI);
734 return MO.getImm() >> 1;
737 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
738 /// immediate branch target.
739 uint32_t ARMMCCodeEmitter::
740 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
741 SmallVectorImpl<MCFixup> &Fixups,
742 const MCSubtargetInfo &STI) const {
744 const MCOperand MO = MI.getOperand(OpIdx);
747 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups, STI);
749 Val = MO.getImm() >> 1;
751 bool I = (Val & 0x800000);
752 bool J1 = (Val & 0x400000);
753 bool J2 = (Val & 0x200000);
767 /// getAdrLabelOpValue - Return encoding info for 12-bit shifted-immediate
768 /// ADR label target.
769 uint32_t ARMMCCodeEmitter::
770 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
771 SmallVectorImpl<MCFixup> &Fixups,
772 const MCSubtargetInfo &STI) const {
773 const MCOperand MO = MI.getOperand(OpIdx);
775 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
777 int64_t offset = MO.getImm();
778 uint32_t Val = 0x2000;
781 if (offset == INT32_MIN) {
784 } else if (offset < 0) {
787 SoImmVal = ARM_AM::getSOImmVal(offset);
791 SoImmVal = ARM_AM::getSOImmVal(offset);
794 SoImmVal = ARM_AM::getSOImmVal(offset);
798 SoImmVal = ARM_AM::getSOImmVal(offset);
802 assert(SoImmVal != -1 && "Not a valid so_imm value!");
808 /// getT2AdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
810 uint32_t ARMMCCodeEmitter::
811 getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
812 SmallVectorImpl<MCFixup> &Fixups,
813 const MCSubtargetInfo &STI) const {
814 const MCOperand MO = MI.getOperand(OpIdx);
816 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
818 int32_t Val = MO.getImm();
819 if (Val == INT32_MIN)
828 /// getThumbAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label
830 uint32_t ARMMCCodeEmitter::
831 getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
832 SmallVectorImpl<MCFixup> &Fixups,
833 const MCSubtargetInfo &STI) const {
834 const MCOperand MO = MI.getOperand(OpIdx);
836 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10,
841 /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg'
843 uint32_t ARMMCCodeEmitter::
844 getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
845 SmallVectorImpl<MCFixup> &,
846 const MCSubtargetInfo &STI) const {
850 const MCOperand &MO1 = MI.getOperand(OpIdx);
851 const MCOperand &MO2 = MI.getOperand(OpIdx + 1);
852 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
853 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
854 return (Rm << 3) | Rn;
857 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
858 uint32_t ARMMCCodeEmitter::
859 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
860 SmallVectorImpl<MCFixup> &Fixups,
861 const MCSubtargetInfo &STI) const {
863 // {12} = (U)nsigned (add == '1', sub == '0')
867 // If The first operand isn't a register, we have a label reference.
868 const MCOperand &MO = MI.getOperand(OpIdx);
870 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
874 const MCExpr *Expr = MO.getExpr();
875 isAdd = false ; // 'U' bit is set as part of the fixup.
879 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
881 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
882 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
884 ++MCNumCPRelocations;
887 int32_t Offset = MO.getImm();
888 if (Offset == INT32_MIN) {
891 } else if (Offset < 0) {
898 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups, STI);
900 uint32_t Binary = Imm12 & 0xfff;
901 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
904 Binary |= (Reg << 13);
908 /// getT2Imm8s4OpValue - Return encoding info for
909 /// '+/- imm8<<2' operand.
910 uint32_t ARMMCCodeEmitter::
911 getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
912 SmallVectorImpl<MCFixup> &Fixups,
913 const MCSubtargetInfo &STI) const {
914 // FIXME: The immediate operand should have already been encoded like this
915 // before ever getting here. The encoder method should just need to combine
916 // the MI operands for the register and the offset into a single
917 // representation for the complex operand in the .td file. This isn't just
918 // style, unfortunately. As-is, we can't represent the distinct encoding
921 // {8} = (U)nsigned (add == '1', sub == '0')
923 int32_t Imm8 = MI.getOperand(OpIdx).getImm();
924 bool isAdd = Imm8 >= 0;
926 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
928 Imm8 = -(uint32_t)Imm8;
933 uint32_t Binary = Imm8 & 0xff;
934 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
940 /// getT2AddrModeImm8s4OpValue - Return encoding info for
941 /// 'reg +/- imm8<<2' operand.
942 uint32_t ARMMCCodeEmitter::
943 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
944 SmallVectorImpl<MCFixup> &Fixups,
945 const MCSubtargetInfo &STI) const {
947 // {8} = (U)nsigned (add == '1', sub == '0')
951 // If The first operand isn't a register, we have a label reference.
952 const MCOperand &MO = MI.getOperand(OpIdx);
954 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
956 isAdd = false ; // 'U' bit is set as part of the fixup.
958 assert(MO.isExpr() && "Unexpected machine operand type!");
959 const MCExpr *Expr = MO.getExpr();
960 MCFixupKind Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
961 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
963 ++MCNumCPRelocations;
965 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
967 // FIXME: The immediate operand should have already been encoded like this
968 // before ever getting here. The encoder method should just need to combine
969 // the MI operands for the register and the offset into a single
970 // representation for the complex operand in the .td file. This isn't just
971 // style, unfortunately. As-is, we can't represent the distinct encoding
973 uint32_t Binary = (Imm8 >> 2) & 0xff;
974 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
977 Binary |= (Reg << 9);
981 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for
982 /// 'reg + imm8<<2' operand.
983 uint32_t ARMMCCodeEmitter::
984 getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
985 SmallVectorImpl<MCFixup> &Fixups,
986 const MCSubtargetInfo &STI) const {
989 const MCOperand &MO = MI.getOperand(OpIdx);
990 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
991 unsigned Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
992 unsigned Imm8 = MO1.getImm();
993 return (Reg << 8) | Imm8;
997 ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
998 SmallVectorImpl<MCFixup> &Fixups,
999 const MCSubtargetInfo &STI) const {
1000 // {20-16} = imm{15-12}
1001 // {11-0} = imm{11-0}
1002 const MCOperand &MO = MI.getOperand(OpIdx);
1004 // Hi / lo 16 bits already extracted during earlier passes.
1005 return static_cast<unsigned>(MO.getImm());
1007 // Handle :upper16: and :lower16: assembly prefixes.
1008 const MCExpr *E = MO.getExpr();
1010 if (E->getKind() == MCExpr::Target) {
1011 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E);
1012 E = ARM16Expr->getSubExpr();
1014 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(E)) {
1015 const int64_t Value = MCE->getValue();
1016 if (Value > UINT32_MAX)
1017 report_fatal_error("constant value truncated (limited to 32-bit)");
1019 switch (ARM16Expr->getKind()) {
1020 case ARMMCExpr::VK_ARM_HI16:
1021 return (int32_t(Value) & 0xffff0000) >> 16;
1022 case ARMMCExpr::VK_ARM_LO16:
1023 return (int32_t(Value) & 0x0000ffff);
1024 default: llvm_unreachable("Unsupported ARMFixup");
1028 switch (ARM16Expr->getKind()) {
1029 default: llvm_unreachable("Unsupported ARMFixup");
1030 case ARMMCExpr::VK_ARM_HI16:
1031 Kind = MCFixupKind(isThumb2(STI) ? ARM::fixup_t2_movt_hi16
1032 : ARM::fixup_arm_movt_hi16);
1034 case ARMMCExpr::VK_ARM_LO16:
1035 Kind = MCFixupKind(isThumb2(STI) ? ARM::fixup_t2_movw_lo16
1036 : ARM::fixup_arm_movw_lo16);
1039 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc()));
1042 // If the expression doesn't have :upper16: or :lower16: on it,
1043 // it's just a plain immediate expression, previously those evaluated to
1044 // the lower 16 bits of the expression regardless of whether
1045 // we have a movt or a movw, but that led to misleadingly results.
1046 // This is now disallowed in the the AsmParser in validateInstruction()
1047 // so this should never happen.
1048 assert(0 && "expression without :upper16: or :lower16:");
1052 uint32_t ARMMCCodeEmitter::
1053 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
1054 SmallVectorImpl<MCFixup> &Fixups,
1055 const MCSubtargetInfo &STI) const {
1056 const MCOperand &MO = MI.getOperand(OpIdx);
1057 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1058 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1059 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1060 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1061 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
1062 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
1063 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
1064 unsigned SBits = getShiftOp(ShOp);
1066 // While "lsr #32" and "asr #32" exist, they are encoded with a 0 in the shift
1067 // amount. However, it would be an easy mistake to make so check here.
1068 assert((ShImm & ~0x1f) == 0 && "Out of range shift amount");
1077 uint32_t Binary = Rm;
1079 Binary |= SBits << 5;
1080 Binary |= ShImm << 7;
1086 uint32_t ARMMCCodeEmitter::
1087 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
1088 SmallVectorImpl<MCFixup> &Fixups,
1089 const MCSubtargetInfo &STI) const {
1091 // {13} 1 == imm12, 0 == Rm
1094 const MCOperand &MO = MI.getOperand(OpIdx);
1095 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1096 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups, STI);
1101 uint32_t ARMMCCodeEmitter::
1102 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1103 SmallVectorImpl<MCFixup> &Fixups,
1104 const MCSubtargetInfo &STI) const {
1105 // {13} 1 == imm12, 0 == Rm
1108 const MCOperand &MO = MI.getOperand(OpIdx);
1109 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1110 unsigned Imm = MO1.getImm();
1111 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
1112 bool isReg = MO.getReg() != 0;
1113 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
1114 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
1116 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
1117 Binary <<= 7; // Shift amount is bits [11:7]
1118 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
1119 Binary |= CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); // Rm is bits [3:0]
1121 return Binary | (isAdd << 12) | (isReg << 13);
1124 uint32_t ARMMCCodeEmitter::
1125 getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
1126 SmallVectorImpl<MCFixup> &Fixups,
1127 const MCSubtargetInfo &STI) const {
1130 const MCOperand &MO = MI.getOperand(OpIdx);
1131 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1132 bool isAdd = MO1.getImm() != 0;
1133 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()) | (isAdd << 4);
1136 uint32_t ARMMCCodeEmitter::
1137 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1138 SmallVectorImpl<MCFixup> &Fixups,
1139 const MCSubtargetInfo &STI) const {
1140 // {9} 1 == imm8, 0 == Rm
1142 // {7-4} imm7_4/zero
1144 const MCOperand &MO = MI.getOperand(OpIdx);
1145 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1146 unsigned Imm = MO1.getImm();
1147 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1148 bool isImm = MO.getReg() == 0;
1149 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1150 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1152 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1153 return Imm8 | (isAdd << 8) | (isImm << 9);
1156 uint32_t ARMMCCodeEmitter::
1157 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
1158 SmallVectorImpl<MCFixup> &Fixups,
1159 const MCSubtargetInfo &STI) const {
1160 // {13} 1 == imm8, 0 == Rm
1163 // {7-4} imm7_4/zero
1165 const MCOperand &MO = MI.getOperand(OpIdx);
1166 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1167 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1169 // If The first operand isn't a register, we have a label reference.
1171 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1173 assert(MO.isExpr() && "Unexpected machine operand type!");
1174 const MCExpr *Expr = MO.getExpr();
1175 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10_unscaled);
1176 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1178 ++MCNumCPRelocations;
1179 return (Rn << 9) | (1 << 13);
1181 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1182 unsigned Imm = MO2.getImm();
1183 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1184 bool isImm = MO1.getReg() == 0;
1185 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1186 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1188 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1189 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
1192 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
1193 uint32_t ARMMCCodeEmitter::
1194 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
1195 SmallVectorImpl<MCFixup> &Fixups,
1196 const MCSubtargetInfo &STI) const {
1199 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1200 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
1201 "Unexpected base register!");
1203 // The immediate is already shifted for the implicit zeroes, so no change
1205 return MO1.getImm() & 0xff;
1208 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
1209 uint32_t ARMMCCodeEmitter::
1210 getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
1211 SmallVectorImpl<MCFixup> &Fixups,
1212 const MCSubtargetInfo &STI) const {
1216 const MCOperand &MO = MI.getOperand(OpIdx);
1217 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1218 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1219 unsigned Imm5 = MO1.getImm();
1220 return ((Imm5 & 0x1f) << 3) | Rn;
1223 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
1224 uint32_t ARMMCCodeEmitter::
1225 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
1226 SmallVectorImpl<MCFixup> &Fixups,
1227 const MCSubtargetInfo &STI) const {
1228 const MCOperand MO = MI.getOperand(OpIdx);
1230 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups, STI);
1231 return (MO.getImm() >> 2);
1234 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
1235 uint32_t ARMMCCodeEmitter::
1236 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
1237 SmallVectorImpl<MCFixup> &Fixups,
1238 const MCSubtargetInfo &STI) const {
1240 // {8} = (U)nsigned (add == '1', sub == '0')
1244 // If The first operand isn't a register, we have a label reference.
1245 const MCOperand &MO = MI.getOperand(OpIdx);
1247 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1249 isAdd = false; // 'U' bit is handled as part of the fixup.
1251 assert(MO.isExpr() && "Unexpected machine operand type!");
1252 const MCExpr *Expr = MO.getExpr();
1255 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
1257 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
1258 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1260 ++MCNumCPRelocations;
1262 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
1263 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
1266 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
1267 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1270 Binary |= (Reg << 9);
1274 unsigned ARMMCCodeEmitter::
1275 getSORegRegOpValue(const MCInst &MI, unsigned OpIdx,
1276 SmallVectorImpl<MCFixup> &Fixups,
1277 const MCSubtargetInfo &STI) const {
1278 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
1279 // shifted. The second is Rs, the amount to shift by, and the third specifies
1280 // the type of the shift.
1288 const MCOperand &MO = MI.getOperand(OpIdx);
1289 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1290 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
1291 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
1294 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1296 // Encode the shift opcode.
1298 unsigned Rs = MO1.getReg();
1300 // Set shift operand (bit[7:4]).
1306 default: llvm_unreachable("Unknown shift opc!");
1307 case ARM_AM::lsl: SBits = 0x1; break;
1308 case ARM_AM::lsr: SBits = 0x3; break;
1309 case ARM_AM::asr: SBits = 0x5; break;
1310 case ARM_AM::ror: SBits = 0x7; break;
1314 Binary |= SBits << 4;
1316 // Encode the shift operation Rs.
1317 // Encode Rs bit[11:8].
1318 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
1319 return Binary | (CTX.getRegisterInfo()->getEncodingValue(Rs) << ARMII::RegRsShift);
1322 unsigned ARMMCCodeEmitter::
1323 getSORegImmOpValue(const MCInst &MI, unsigned OpIdx,
1324 SmallVectorImpl<MCFixup> &Fixups,
1325 const MCSubtargetInfo &STI) const {
1326 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1327 // shifted. The second is the amount to shift by.
1334 const MCOperand &MO = MI.getOperand(OpIdx);
1335 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1336 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1339 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1341 // Encode the shift opcode.
1344 // Set shift operand (bit[6:4]).
1349 // RRX - 110 and bit[11:8] clear.
1351 default: llvm_unreachable("Unknown shift opc!");
1352 case ARM_AM::lsl: SBits = 0x0; break;
1353 case ARM_AM::lsr: SBits = 0x2; break;
1354 case ARM_AM::asr: SBits = 0x4; break;
1355 case ARM_AM::ror: SBits = 0x6; break;
1361 // Encode shift_imm bit[11:7].
1362 Binary |= SBits << 4;
1363 unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm());
1364 assert(Offset < 32 && "Offset must be in range 0-31!");
1365 return Binary | (Offset << 7);
1369 unsigned ARMMCCodeEmitter::
1370 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
1371 SmallVectorImpl<MCFixup> &Fixups,
1372 const MCSubtargetInfo &STI) const {
1373 const MCOperand &MO1 = MI.getOperand(OpNum);
1374 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1375 const MCOperand &MO3 = MI.getOperand(OpNum+2);
1377 // Encoded as [Rn, Rm, imm].
1378 // FIXME: Needs fixup support.
1379 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1381 Value |= CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
1383 Value |= MO3.getImm();
1388 unsigned ARMMCCodeEmitter::
1389 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
1390 SmallVectorImpl<MCFixup> &Fixups,
1391 const MCSubtargetInfo &STI) const {
1392 const MCOperand &MO1 = MI.getOperand(OpNum);
1393 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1395 // FIXME: Needs fixup support.
1396 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1398 // Even though the immediate is 8 bits long, we need 9 bits in order
1399 // to represent the (inverse of the) sign bit.
1401 int32_t tmp = (int32_t)MO2.getImm();
1405 Value |= 256; // Set the ADD bit
1410 unsigned ARMMCCodeEmitter::
1411 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
1412 SmallVectorImpl<MCFixup> &Fixups,
1413 const MCSubtargetInfo &STI) const {
1414 const MCOperand &MO1 = MI.getOperand(OpNum);
1416 // FIXME: Needs fixup support.
1418 int32_t tmp = (int32_t)MO1.getImm();
1422 Value |= 256; // Set the ADD bit
1427 unsigned ARMMCCodeEmitter::
1428 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
1429 SmallVectorImpl<MCFixup> &Fixups,
1430 const MCSubtargetInfo &STI) const {
1431 const MCOperand &MO1 = MI.getOperand(OpNum);
1433 // FIXME: Needs fixup support.
1435 int32_t tmp = (int32_t)MO1.getImm();
1439 Value |= 4096; // Set the ADD bit
1440 Value |= tmp & 4095;
1444 unsigned ARMMCCodeEmitter::
1445 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1446 SmallVectorImpl<MCFixup> &Fixups,
1447 const MCSubtargetInfo &STI) const {
1448 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1449 // shifted. The second is the amount to shift by.
1456 const MCOperand &MO = MI.getOperand(OpIdx);
1457 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1458 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1461 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1463 // Encode the shift opcode.
1465 // Set shift operand (bit[6:4]).
1471 default: llvm_unreachable("Unknown shift opc!");
1472 case ARM_AM::lsl: SBits = 0x0; break;
1473 case ARM_AM::lsr: SBits = 0x2; break;
1474 case ARM_AM::asr: SBits = 0x4; break;
1475 case ARM_AM::rrx: // FALLTHROUGH
1476 case ARM_AM::ror: SBits = 0x6; break;
1479 Binary |= SBits << 4;
1480 if (SOpc == ARM_AM::rrx)
1483 // Encode shift_imm bit[11:7].
1484 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1487 unsigned ARMMCCodeEmitter::
1488 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1489 SmallVectorImpl<MCFixup> &Fixups,
1490 const MCSubtargetInfo &STI) const {
1491 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1493 const MCOperand &MO = MI.getOperand(Op);
1494 uint32_t v = ~MO.getImm();
1495 uint32_t lsb = countTrailingZeros(v);
1496 uint32_t msb = (32 - countLeadingZeros (v)) - 1;
1497 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1498 return lsb | (msb << 5);
1501 unsigned ARMMCCodeEmitter::
1502 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1503 SmallVectorImpl<MCFixup> &Fixups,
1504 const MCSubtargetInfo &STI) const {
1507 // {7-0} = Number of registers
1510 // {15-0} = Bitfield of GPRs.
1511 unsigned Reg = MI.getOperand(Op).getReg();
1512 bool SPRRegs = ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg);
1513 bool DPRRegs = ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg);
1515 unsigned Binary = 0;
1517 if (SPRRegs || DPRRegs) {
1519 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
1520 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1521 Binary |= (RegNo & 0x1f) << 8;
1525 Binary |= NumRegs * 2;
1527 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1528 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(MI.getOperand(I).getReg());
1529 Binary |= 1 << RegNo;
1536 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1537 /// with the alignment operand.
1538 unsigned ARMMCCodeEmitter::
1539 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1540 SmallVectorImpl<MCFixup> &Fixups,
1541 const MCSubtargetInfo &STI) const {
1542 const MCOperand &Reg = MI.getOperand(Op);
1543 const MCOperand &Imm = MI.getOperand(Op + 1);
1545 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1548 switch (Imm.getImm()) {
1552 case 8: Align = 0x01; break;
1553 case 16: Align = 0x02; break;
1554 case 32: Align = 0x03; break;
1557 return RegNo | (Align << 4);
1560 /// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number
1561 /// along with the alignment operand for use in VST1 and VLD1 with size 32.
1562 unsigned ARMMCCodeEmitter::
1563 getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
1564 SmallVectorImpl<MCFixup> &Fixups,
1565 const MCSubtargetInfo &STI) const {
1566 const MCOperand &Reg = MI.getOperand(Op);
1567 const MCOperand &Imm = MI.getOperand(Op + 1);
1569 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1572 switch (Imm.getImm()) {
1576 case 32: // Default '0' value for invalid alignments of 8, 16, 32 bytes.
1577 case 2: Align = 0x00; break;
1578 case 4: Align = 0x03; break;
1581 return RegNo | (Align << 4);
1585 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1586 /// alignment operand for use in VLD-dup instructions. This is the same as
1587 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1588 /// different for VLD4-dup.
1589 unsigned ARMMCCodeEmitter::
1590 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1591 SmallVectorImpl<MCFixup> &Fixups,
1592 const MCSubtargetInfo &STI) const {
1593 const MCOperand &Reg = MI.getOperand(Op);
1594 const MCOperand &Imm = MI.getOperand(Op + 1);
1596 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1599 switch (Imm.getImm()) {
1603 case 8: Align = 0x01; break;
1604 case 16: Align = 0x03; break;
1607 return RegNo | (Align << 4);
1610 unsigned ARMMCCodeEmitter::
1611 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1612 SmallVectorImpl<MCFixup> &Fixups,
1613 const MCSubtargetInfo &STI) const {
1614 const MCOperand &MO = MI.getOperand(Op);
1615 if (MO.getReg() == 0) return 0x0D;
1616 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1619 unsigned ARMMCCodeEmitter::
1620 getShiftRight8Imm(const MCInst &MI, unsigned Op,
1621 SmallVectorImpl<MCFixup> &Fixups,
1622 const MCSubtargetInfo &STI) const {
1623 return 8 - MI.getOperand(Op).getImm();
1626 unsigned ARMMCCodeEmitter::
1627 getShiftRight16Imm(const MCInst &MI, unsigned Op,
1628 SmallVectorImpl<MCFixup> &Fixups,
1629 const MCSubtargetInfo &STI) const {
1630 return 16 - MI.getOperand(Op).getImm();
1633 unsigned ARMMCCodeEmitter::
1634 getShiftRight32Imm(const MCInst &MI, unsigned Op,
1635 SmallVectorImpl<MCFixup> &Fixups,
1636 const MCSubtargetInfo &STI) const {
1637 return 32 - MI.getOperand(Op).getImm();
1640 unsigned ARMMCCodeEmitter::
1641 getShiftRight64Imm(const MCInst &MI, unsigned Op,
1642 SmallVectorImpl<MCFixup> &Fixups,
1643 const MCSubtargetInfo &STI) const {
1644 return 64 - MI.getOperand(Op).getImm();
1647 void ARMMCCodeEmitter::
1648 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1649 SmallVectorImpl<MCFixup> &Fixups,
1650 const MCSubtargetInfo &STI) const {
1651 // Pseudo instructions don't get encoded.
1652 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
1653 uint64_t TSFlags = Desc.TSFlags;
1654 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1658 if (Desc.getSize() == 2 || Desc.getSize() == 4)
1659 Size = Desc.getSize();
1661 llvm_unreachable("Unexpected instruction size!");
1663 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups, STI);
1664 // Thumb 32-bit wide instructions need to emit the high order halfword
1666 if (isThumb(STI) && Size == 4) {
1667 EmitConstant(Binary >> 16, 2, OS);
1668 EmitConstant(Binary & 0xffff, 2, OS);
1670 EmitConstant(Binary, Size, OS);
1671 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1674 #include "ARMGenMCCodeEmitter.inc"