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;
45 ARMMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx)
46 : MCII(mcii), CTX(ctx) {
49 ~ARMMCCodeEmitter() {}
51 bool isThumb(const MCSubtargetInfo &STI) const {
52 return (STI.getFeatureBits() & ARM::ModeThumb) != 0;
54 bool isThumb2(const MCSubtargetInfo &STI) const {
55 return isThumb(STI) && (STI.getFeatureBits() & ARM::FeatureThumb2) != 0;
57 bool isTargetMachO(const MCSubtargetInfo &STI) const {
58 Triple TT(STI.getTargetTriple());
59 return TT.isOSBinFormatMachO();
62 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
64 // getBinaryCodeForInstr - TableGen'erated function for getting the
65 // binary encoding for an instruction.
66 uint64_t getBinaryCodeForInstr(const MCInst &MI,
67 SmallVectorImpl<MCFixup> &Fixups,
68 const MCSubtargetInfo &STI) const;
70 /// getMachineOpValue - Return binary encoding of operand. If the machine
71 /// operand requires relocation, record the relocation and return zero.
72 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
73 SmallVectorImpl<MCFixup> &Fixups,
74 const MCSubtargetInfo &STI) const;
76 /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of
77 /// the specified operand. This is used for operands with :lower16: and
78 /// :upper16: prefixes.
79 uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
80 SmallVectorImpl<MCFixup> &Fixups,
81 const MCSubtargetInfo &STI) const;
83 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
84 unsigned &Reg, unsigned &Imm,
85 SmallVectorImpl<MCFixup> &Fixups,
86 const MCSubtargetInfo &STI) const;
88 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
90 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
91 SmallVectorImpl<MCFixup> &Fixups,
92 const MCSubtargetInfo &STI) const;
94 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
95 /// BLX branch target.
96 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
97 SmallVectorImpl<MCFixup> &Fixups,
98 const MCSubtargetInfo &STI) const;
100 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
101 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
102 SmallVectorImpl<MCFixup> &Fixups,
103 const MCSubtargetInfo &STI) const;
105 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
106 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
107 SmallVectorImpl<MCFixup> &Fixups,
108 const MCSubtargetInfo &STI) const;
110 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
111 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
112 SmallVectorImpl<MCFixup> &Fixups,
113 const MCSubtargetInfo &STI) const;
115 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
117 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
118 SmallVectorImpl<MCFixup> &Fixups,
119 const MCSubtargetInfo &STI) const;
121 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
122 /// immediate Thumb2 direct branch target.
123 uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
124 SmallVectorImpl<MCFixup> &Fixups,
125 const MCSubtargetInfo &STI) const;
127 /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate
129 uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
130 SmallVectorImpl<MCFixup> &Fixups,
131 const MCSubtargetInfo &STI) const;
132 uint32_t getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
133 SmallVectorImpl<MCFixup> &Fixups,
134 const MCSubtargetInfo &STI) const;
135 uint32_t getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
136 SmallVectorImpl<MCFixup> &Fixups,
137 const MCSubtargetInfo &STI) const;
139 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
140 /// ADR label target.
141 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
142 SmallVectorImpl<MCFixup> &Fixups,
143 const MCSubtargetInfo &STI) const;
144 uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
145 SmallVectorImpl<MCFixup> &Fixups,
146 const MCSubtargetInfo &STI) const;
147 uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
148 SmallVectorImpl<MCFixup> &Fixups,
149 const MCSubtargetInfo &STI) const;
152 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
154 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
155 SmallVectorImpl<MCFixup> &Fixups,
156 const MCSubtargetInfo &STI) const;
158 /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
159 uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
160 SmallVectorImpl<MCFixup> &Fixups,
161 const MCSubtargetInfo &STI) const;
163 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
165 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
166 SmallVectorImpl<MCFixup> &Fixups,
167 const MCSubtargetInfo &STI) const;
169 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for 'reg + imm8<<2'
171 uint32_t getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
172 SmallVectorImpl<MCFixup> &Fixups,
173 const MCSubtargetInfo &STI) const;
175 /// getT2Imm8s4OpValue - Return encoding info for '+/- imm8<<2'
177 uint32_t getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
178 SmallVectorImpl<MCFixup> &Fixups,
179 const MCSubtargetInfo &STI) const;
182 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
183 /// operand as needed by load/store instructions.
184 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
185 SmallVectorImpl<MCFixup> &Fixups,
186 const MCSubtargetInfo &STI) const;
188 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
189 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
190 SmallVectorImpl<MCFixup> &Fixups,
191 const MCSubtargetInfo &STI) const {
192 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
194 default: llvm_unreachable("Unknown addressing sub-mode!");
195 case ARM_AM::da: return 0;
196 case ARM_AM::ia: return 1;
197 case ARM_AM::db: return 2;
198 case ARM_AM::ib: return 3;
201 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
203 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
205 case ARM_AM::no_shift:
206 case ARM_AM::lsl: return 0;
207 case ARM_AM::lsr: return 1;
208 case ARM_AM::asr: return 2;
210 case ARM_AM::rrx: return 3;
212 llvm_unreachable("Invalid ShiftOpc!");
215 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
216 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
217 SmallVectorImpl<MCFixup> &Fixups,
218 const MCSubtargetInfo &STI) const;
220 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
221 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
222 SmallVectorImpl<MCFixup> &Fixups,
223 const MCSubtargetInfo &STI) const;
225 /// getPostIdxRegOpValue - Return encoding for postidx_reg operands.
226 uint32_t getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
227 SmallVectorImpl<MCFixup> &Fixups,
228 const MCSubtargetInfo &STI) const;
230 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
231 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
232 SmallVectorImpl<MCFixup> &Fixups,
233 const MCSubtargetInfo &STI) const;
235 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
236 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
237 SmallVectorImpl<MCFixup> &Fixups,
238 const MCSubtargetInfo &STI) const;
240 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
242 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
243 SmallVectorImpl<MCFixup> &Fixups,
244 const MCSubtargetInfo &STI) const;
246 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
247 uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
248 SmallVectorImpl<MCFixup> &Fixups,
249 const MCSubtargetInfo &STI) const;
251 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
252 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
253 SmallVectorImpl<MCFixup> &Fixups,
254 const MCSubtargetInfo &STI) const;
256 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
257 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
258 SmallVectorImpl<MCFixup> &Fixups,
259 const MCSubtargetInfo &STI) const;
261 /// getCCOutOpValue - Return encoding of the 's' bit.
262 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
263 SmallVectorImpl<MCFixup> &Fixups,
264 const MCSubtargetInfo &STI) const {
265 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
267 return MI.getOperand(Op).getReg() == ARM::CPSR;
270 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
271 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
272 SmallVectorImpl<MCFixup> &Fixups,
273 const MCSubtargetInfo &STI) const {
276 const MCOperand &MO = MI.getOperand(Op);
278 SoImmVal = ARM_AM::getSOImmVal(MO.getImm());
279 } else if (MO.isExpr()) {
281 bool Invalid = MO.getExpr()->EvaluateAsAbsolute(Value);
283 assert(!Invalid && "non-constant expression is not a valid SOImm operand");
284 assert((Value >= INT32_MIN && Value <= INT32_MAX) &&
285 "expression must be representable in 32 bits");
288 assert(SoImmVal != -1 && "Not a valid so_imm value!");
290 // Encode rotate_imm.
291 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
292 << ARMII::SoRotImmShift;
295 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
299 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
300 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
301 SmallVectorImpl<MCFixup> &Fixups,
302 const MCSubtargetInfo &STI) const {
303 unsigned SoImm = MI.getOperand(Op).getImm();
304 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
305 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
309 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
310 SmallVectorImpl<MCFixup> &Fixups,
311 const MCSubtargetInfo &STI) const;
312 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
313 SmallVectorImpl<MCFixup> &Fixups,
314 const MCSubtargetInfo &STI) const;
315 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
316 SmallVectorImpl<MCFixup> &Fixups,
317 const MCSubtargetInfo &STI) const;
318 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
319 SmallVectorImpl<MCFixup> &Fixups,
320 const MCSubtargetInfo &STI) const;
322 /// getSORegOpValue - Return an encoded so_reg shifted register value.
323 unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op,
324 SmallVectorImpl<MCFixup> &Fixups,
325 const MCSubtargetInfo &STI) const;
326 unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op,
327 SmallVectorImpl<MCFixup> &Fixups,
328 const MCSubtargetInfo &STI) const;
329 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
330 SmallVectorImpl<MCFixup> &Fixups,
331 const MCSubtargetInfo &STI) const;
333 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
334 SmallVectorImpl<MCFixup> &Fixups,
335 const MCSubtargetInfo &STI) const {
336 return 64 - MI.getOperand(Op).getImm();
339 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
340 SmallVectorImpl<MCFixup> &Fixups,
341 const MCSubtargetInfo &STI) const;
343 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
344 SmallVectorImpl<MCFixup> &Fixups,
345 const MCSubtargetInfo &STI) const;
346 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
347 SmallVectorImpl<MCFixup> &Fixups,
348 const MCSubtargetInfo &STI) const;
349 unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
350 SmallVectorImpl<MCFixup> &Fixups,
351 const MCSubtargetInfo &STI) const;
352 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
353 SmallVectorImpl<MCFixup> &Fixups,
354 const MCSubtargetInfo &STI) const;
355 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
356 SmallVectorImpl<MCFixup> &Fixups,
357 const MCSubtargetInfo &STI) const;
359 unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op,
360 SmallVectorImpl<MCFixup> &Fixups,
361 const MCSubtargetInfo &STI) const;
362 unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op,
363 SmallVectorImpl<MCFixup> &Fixups,
364 const MCSubtargetInfo &STI) const;
365 unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op,
366 SmallVectorImpl<MCFixup> &Fixups,
367 const MCSubtargetInfo &STI) const;
368 unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op,
369 SmallVectorImpl<MCFixup> &Fixups,
370 const MCSubtargetInfo &STI) const;
372 unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op,
373 SmallVectorImpl<MCFixup> &Fixups,
374 const MCSubtargetInfo &STI) const;
376 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
377 unsigned EncodedValue,
378 const MCSubtargetInfo &STI) const;
379 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
380 unsigned EncodedValue,
381 const MCSubtargetInfo &STI) const;
382 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
383 unsigned EncodedValue,
384 const MCSubtargetInfo &STI) const;
385 unsigned NEONThumb2V8PostEncoder(const MCInst &MI,
386 unsigned EncodedValue,
387 const MCSubtargetInfo &STI) const;
389 unsigned VFPThumb2PostEncoder(const MCInst &MI,
390 unsigned EncodedValue,
391 const MCSubtargetInfo &STI) const;
393 void EmitByte(unsigned char C, raw_ostream &OS) const {
397 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
398 // Output the constant in little endian byte order.
399 for (unsigned i = 0; i != Size; ++i) {
400 EmitByte(Val & 255, OS);
405 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
406 SmallVectorImpl<MCFixup> &Fixups,
407 const MCSubtargetInfo &STI) const override;
410 } // end anonymous namespace
412 MCCodeEmitter *llvm::createARMMCCodeEmitter(const MCInstrInfo &MCII,
413 const MCRegisterInfo &MRI,
414 const MCSubtargetInfo &STI,
416 return new ARMMCCodeEmitter(MCII, Ctx);
419 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
420 /// instructions, and rewrite them to their Thumb2 form if we are currently in
422 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
423 unsigned EncodedValue,
424 const MCSubtargetInfo &STI) const {
426 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
427 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
429 unsigned Bit24 = EncodedValue & 0x01000000;
430 unsigned Bit28 = Bit24 << 4;
431 EncodedValue &= 0xEFFFFFFF;
432 EncodedValue |= Bit28;
433 EncodedValue |= 0x0F000000;
439 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
440 /// instructions, and rewrite them to their Thumb2 form if we are currently in
442 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
443 unsigned EncodedValue,
444 const MCSubtargetInfo &STI) const {
446 EncodedValue &= 0xF0FFFFFF;
447 EncodedValue |= 0x09000000;
453 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
454 /// instructions, and rewrite them to their Thumb2 form if we are currently in
456 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
457 unsigned EncodedValue,
458 const MCSubtargetInfo &STI) const {
460 EncodedValue &= 0x00FFFFFF;
461 EncodedValue |= 0xEE000000;
467 /// Post-process encoded NEON v8 instructions, and rewrite them to Thumb2 form
468 /// if we are in Thumb2.
469 unsigned ARMMCCodeEmitter::NEONThumb2V8PostEncoder(const MCInst &MI,
470 unsigned EncodedValue,
471 const MCSubtargetInfo &STI) const {
473 EncodedValue |= 0xC000000; // Set bits 27-26
479 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
480 /// them to their Thumb2 form if we are currently in Thumb2 mode.
481 unsigned ARMMCCodeEmitter::
482 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue,
483 const MCSubtargetInfo &STI) const {
485 EncodedValue &= 0x0FFFFFFF;
486 EncodedValue |= 0xE0000000;
491 /// getMachineOpValue - Return binary encoding of operand. If the machine
492 /// operand requires relocation, record the relocation and return zero.
493 unsigned ARMMCCodeEmitter::
494 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
495 SmallVectorImpl<MCFixup> &Fixups,
496 const MCSubtargetInfo &STI) const {
498 unsigned Reg = MO.getReg();
499 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
501 // Q registers are encoded as 2x their register number.
505 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
506 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
507 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
508 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
511 } else if (MO.isImm()) {
512 return static_cast<unsigned>(MO.getImm());
513 } else if (MO.isFPImm()) {
514 return static_cast<unsigned>(APFloat(MO.getFPImm())
515 .bitcastToAPInt().getHiBits(32).getLimitedValue());
518 llvm_unreachable("Unable to encode MCOperand!");
521 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
522 bool ARMMCCodeEmitter::
523 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
524 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups,
525 const MCSubtargetInfo &STI) const {
526 const MCOperand &MO = MI.getOperand(OpIdx);
527 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
529 Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
531 int32_t SImm = MO1.getImm();
534 // Special value for #-0
535 if (SImm == INT32_MIN) {
540 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
550 /// getBranchTargetOpValue - Helper function to get the branch target operand,
551 /// which is either an immediate or requires a fixup.
552 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
554 SmallVectorImpl<MCFixup> &Fixups,
555 const MCSubtargetInfo &STI) {
556 const MCOperand &MO = MI.getOperand(OpIdx);
558 // If the destination is an immediate, we have nothing to do.
559 if (MO.isImm()) return MO.getImm();
560 assert(MO.isExpr() && "Unexpected branch target type!");
561 const MCExpr *Expr = MO.getExpr();
562 MCFixupKind Kind = MCFixupKind(FixupKind);
563 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
565 // All of the information is in the fixup.
569 // Thumb BL and BLX use a strange offset encoding where bits 22 and 21 are
570 // determined by negating them and XOR'ing them with bit 23.
571 static int32_t encodeThumbBLOffset(int32_t offset) {
573 uint32_t S = (offset & 0x800000) >> 23;
574 uint32_t J1 = (offset & 0x400000) >> 22;
575 uint32_t J2 = (offset & 0x200000) >> 21;
588 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
589 uint32_t ARMMCCodeEmitter::
590 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
591 SmallVectorImpl<MCFixup> &Fixups,
592 const MCSubtargetInfo &STI) const {
593 const MCOperand MO = MI.getOperand(OpIdx);
595 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl,
597 return encodeThumbBLOffset(MO.getImm());
600 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
601 /// BLX branch target.
602 uint32_t ARMMCCodeEmitter::
603 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
604 SmallVectorImpl<MCFixup> &Fixups,
605 const MCSubtargetInfo &STI) const {
606 const MCOperand MO = MI.getOperand(OpIdx);
608 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx,
610 return encodeThumbBLOffset(MO.getImm());
613 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
614 uint32_t ARMMCCodeEmitter::
615 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
616 SmallVectorImpl<MCFixup> &Fixups,
617 const MCSubtargetInfo &STI) const {
618 const MCOperand MO = MI.getOperand(OpIdx);
620 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br,
622 return (MO.getImm() >> 1);
625 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
626 uint32_t ARMMCCodeEmitter::
627 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
628 SmallVectorImpl<MCFixup> &Fixups,
629 const MCSubtargetInfo &STI) const {
630 const MCOperand MO = MI.getOperand(OpIdx);
632 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc,
634 return (MO.getImm() >> 1);
637 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
638 uint32_t ARMMCCodeEmitter::
639 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
640 SmallVectorImpl<MCFixup> &Fixups,
641 const MCSubtargetInfo &STI) const {
642 const MCOperand MO = MI.getOperand(OpIdx);
644 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups, STI);
645 return (MO.getImm() >> 1);
648 /// Return true if this branch has a non-always predication
649 static bool HasConditionalBranch(const MCInst &MI) {
650 int NumOp = MI.getNumOperands();
652 for (int i = 0; i < NumOp-1; ++i) {
653 const MCOperand &MCOp1 = MI.getOperand(i);
654 const MCOperand &MCOp2 = MI.getOperand(i + 1);
655 if (MCOp1.isImm() && MCOp2.isReg() &&
656 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
657 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
665 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
667 uint32_t ARMMCCodeEmitter::
668 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
669 SmallVectorImpl<MCFixup> &Fixups,
670 const MCSubtargetInfo &STI) const {
671 // FIXME: This really, really shouldn't use TargetMachine. We don't want
672 // coupling between MC and TM anywhere we can help it.
675 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups, STI);
676 return getARMBranchTargetOpValue(MI, OpIdx, Fixups, STI);
679 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
681 uint32_t ARMMCCodeEmitter::
682 getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
683 SmallVectorImpl<MCFixup> &Fixups,
684 const MCSubtargetInfo &STI) const {
685 const MCOperand MO = MI.getOperand(OpIdx);
687 if (HasConditionalBranch(MI))
688 return ::getBranchTargetOpValue(MI, OpIdx,
689 ARM::fixup_arm_condbranch, Fixups, STI);
690 return ::getBranchTargetOpValue(MI, OpIdx,
691 ARM::fixup_arm_uncondbranch, Fixups, STI);
694 return MO.getImm() >> 2;
697 uint32_t ARMMCCodeEmitter::
698 getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
699 SmallVectorImpl<MCFixup> &Fixups,
700 const MCSubtargetInfo &STI) const {
701 const MCOperand MO = MI.getOperand(OpIdx);
703 if (HasConditionalBranch(MI))
704 return ::getBranchTargetOpValue(MI, OpIdx,
705 ARM::fixup_arm_condbl, Fixups, STI);
706 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_uncondbl, Fixups, STI);
709 return MO.getImm() >> 2;
712 uint32_t ARMMCCodeEmitter::
713 getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
714 SmallVectorImpl<MCFixup> &Fixups,
715 const MCSubtargetInfo &STI) const {
716 const MCOperand MO = MI.getOperand(OpIdx);
718 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_blx, Fixups, STI);
720 return MO.getImm() >> 1;
723 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
724 /// immediate branch target.
725 uint32_t ARMMCCodeEmitter::
726 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
727 SmallVectorImpl<MCFixup> &Fixups,
728 const MCSubtargetInfo &STI) const {
730 const MCOperand MO = MI.getOperand(OpIdx);
733 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups, STI);
735 Val = MO.getImm() >> 1;
737 bool I = (Val & 0x800000);
738 bool J1 = (Val & 0x400000);
739 bool J2 = (Val & 0x200000);
753 /// getAdrLabelOpValue - Return encoding info for 12-bit shifted-immediate
754 /// ADR label target.
755 uint32_t ARMMCCodeEmitter::
756 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
757 SmallVectorImpl<MCFixup> &Fixups,
758 const MCSubtargetInfo &STI) const {
759 const MCOperand MO = MI.getOperand(OpIdx);
761 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
763 int64_t offset = MO.getImm();
764 uint32_t Val = 0x2000;
767 if (offset == INT32_MIN) {
770 } else if (offset < 0) {
773 SoImmVal = ARM_AM::getSOImmVal(offset);
777 SoImmVal = ARM_AM::getSOImmVal(offset);
780 SoImmVal = ARM_AM::getSOImmVal(offset);
784 SoImmVal = ARM_AM::getSOImmVal(offset);
788 assert(SoImmVal != -1 && "Not a valid so_imm value!");
794 /// getT2AdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
796 uint32_t ARMMCCodeEmitter::
797 getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
798 SmallVectorImpl<MCFixup> &Fixups,
799 const MCSubtargetInfo &STI) const {
800 const MCOperand MO = MI.getOperand(OpIdx);
802 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
804 int32_t Val = MO.getImm();
805 if (Val == INT32_MIN)
814 /// getThumbAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label
816 uint32_t ARMMCCodeEmitter::
817 getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
818 SmallVectorImpl<MCFixup> &Fixups,
819 const MCSubtargetInfo &STI) const {
820 const MCOperand MO = MI.getOperand(OpIdx);
822 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10,
827 /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg'
829 uint32_t ARMMCCodeEmitter::
830 getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
831 SmallVectorImpl<MCFixup> &,
832 const MCSubtargetInfo &STI) const {
836 const MCOperand &MO1 = MI.getOperand(OpIdx);
837 const MCOperand &MO2 = MI.getOperand(OpIdx + 1);
838 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
839 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
840 return (Rm << 3) | Rn;
843 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
844 uint32_t ARMMCCodeEmitter::
845 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
846 SmallVectorImpl<MCFixup> &Fixups,
847 const MCSubtargetInfo &STI) const {
849 // {12} = (U)nsigned (add == '1', sub == '0')
853 // If The first operand isn't a register, we have a label reference.
854 const MCOperand &MO = MI.getOperand(OpIdx);
856 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
860 const MCExpr *Expr = MO.getExpr();
861 isAdd = false ; // 'U' bit is set as part of the fixup.
865 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
867 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
868 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
870 ++MCNumCPRelocations;
873 int32_t Offset = MO.getImm();
874 if (Offset == INT32_MIN) {
877 } else if (Offset < 0) {
884 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups, STI);
886 uint32_t Binary = Imm12 & 0xfff;
887 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
890 Binary |= (Reg << 13);
894 /// getT2Imm8s4OpValue - Return encoding info for
895 /// '+/- imm8<<2' operand.
896 uint32_t ARMMCCodeEmitter::
897 getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
898 SmallVectorImpl<MCFixup> &Fixups,
899 const MCSubtargetInfo &STI) const {
900 // FIXME: The immediate operand should have already been encoded like this
901 // before ever getting here. The encoder method should just need to combine
902 // the MI operands for the register and the offset into a single
903 // representation for the complex operand in the .td file. This isn't just
904 // style, unfortunately. As-is, we can't represent the distinct encoding
907 // {8} = (U)nsigned (add == '1', sub == '0')
909 int32_t Imm8 = MI.getOperand(OpIdx).getImm();
910 bool isAdd = Imm8 >= 0;
912 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
914 Imm8 = -(uint32_t)Imm8;
919 uint32_t Binary = Imm8 & 0xff;
920 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
926 /// getT2AddrModeImm8s4OpValue - Return encoding info for
927 /// 'reg +/- imm8<<2' operand.
928 uint32_t ARMMCCodeEmitter::
929 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
930 SmallVectorImpl<MCFixup> &Fixups,
931 const MCSubtargetInfo &STI) const {
933 // {8} = (U)nsigned (add == '1', sub == '0')
937 // If The first operand isn't a register, we have a label reference.
938 const MCOperand &MO = MI.getOperand(OpIdx);
940 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
942 isAdd = false ; // 'U' bit is set as part of the fixup.
944 assert(MO.isExpr() && "Unexpected machine operand type!");
945 const MCExpr *Expr = MO.getExpr();
946 MCFixupKind Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
947 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
949 ++MCNumCPRelocations;
951 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
953 // FIXME: The immediate operand should have already been encoded like this
954 // before ever getting here. The encoder method should just need to combine
955 // the MI operands for the register and the offset into a single
956 // representation for the complex operand in the .td file. This isn't just
957 // style, unfortunately. As-is, we can't represent the distinct encoding
959 uint32_t Binary = (Imm8 >> 2) & 0xff;
960 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
963 Binary |= (Reg << 9);
967 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for
968 /// 'reg + imm8<<2' operand.
969 uint32_t ARMMCCodeEmitter::
970 getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
971 SmallVectorImpl<MCFixup> &Fixups,
972 const MCSubtargetInfo &STI) const {
975 const MCOperand &MO = MI.getOperand(OpIdx);
976 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
977 unsigned Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
978 unsigned Imm8 = MO1.getImm();
979 return (Reg << 8) | Imm8;
982 // FIXME: This routine assumes that a binary
983 // expression will always result in a PCRel expression
984 // In reality, its only true if one or more subexpressions
985 // is itself a PCRel (i.e. "." in asm or some other pcrel construct)
986 // but this is good enough for now.
987 static bool EvaluateAsPCRel(const MCExpr *Expr) {
988 switch (Expr->getKind()) {
989 default: llvm_unreachable("Unexpected expression type");
990 case MCExpr::SymbolRef: return false;
991 case MCExpr::Binary: return true;
996 ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
997 SmallVectorImpl<MCFixup> &Fixups,
998 const MCSubtargetInfo &STI) const {
999 // {20-16} = imm{15-12}
1000 // {11-0} = imm{11-0}
1001 const MCOperand &MO = MI.getOperand(OpIdx);
1003 // Hi / lo 16 bits already extracted during earlier passes.
1004 return static_cast<unsigned>(MO.getImm());
1006 // Handle :upper16: and :lower16: assembly prefixes.
1007 const MCExpr *E = MO.getExpr();
1009 if (E->getKind() == MCExpr::Target) {
1010 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E);
1011 E = ARM16Expr->getSubExpr();
1013 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(E)) {
1014 const int64_t Value = MCE->getValue();
1015 if (Value > UINT32_MAX)
1016 report_fatal_error("constant value truncated (limited to 32-bit)");
1018 switch (ARM16Expr->getKind()) {
1019 case ARMMCExpr::VK_ARM_HI16:
1020 return (int32_t(Value) & 0xffff0000) >> 16;
1021 case ARMMCExpr::VK_ARM_LO16:
1022 return (int32_t(Value) & 0x0000ffff);
1023 default: llvm_unreachable("Unsupported ARMFixup");
1027 switch (ARM16Expr->getKind()) {
1028 default: llvm_unreachable("Unsupported ARMFixup");
1029 case ARMMCExpr::VK_ARM_HI16:
1030 if (!isTargetMachO(STI) && EvaluateAsPCRel(E))
1031 Kind = MCFixupKind(isThumb2(STI)
1032 ? ARM::fixup_t2_movt_hi16_pcrel
1033 : ARM::fixup_arm_movt_hi16_pcrel);
1035 Kind = MCFixupKind(isThumb2(STI)
1036 ? ARM::fixup_t2_movt_hi16
1037 : ARM::fixup_arm_movt_hi16);
1039 case ARMMCExpr::VK_ARM_LO16:
1040 if (!isTargetMachO(STI) && EvaluateAsPCRel(E))
1041 Kind = MCFixupKind(isThumb2(STI)
1042 ? ARM::fixup_t2_movw_lo16_pcrel
1043 : ARM::fixup_arm_movw_lo16_pcrel);
1045 Kind = MCFixupKind(isThumb2(STI)
1046 ? ARM::fixup_t2_movw_lo16
1047 : ARM::fixup_arm_movw_lo16);
1050 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc()));
1053 // If the expression doesn't have :upper16: or :lower16: on it,
1054 // it's just a plain immediate expression, and those evaluate to
1055 // the lower 16 bits of the expression regardless of whether
1056 // we have a movt or a movw.
1057 if (!isTargetMachO(STI) && EvaluateAsPCRel(E))
1058 Kind = MCFixupKind(isThumb2(STI)
1059 ? ARM::fixup_t2_movw_lo16_pcrel
1060 : ARM::fixup_arm_movw_lo16_pcrel);
1062 Kind = MCFixupKind(isThumb2(STI)
1063 ? ARM::fixup_t2_movw_lo16
1064 : ARM::fixup_arm_movw_lo16);
1065 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc()));
1069 uint32_t ARMMCCodeEmitter::
1070 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
1071 SmallVectorImpl<MCFixup> &Fixups,
1072 const MCSubtargetInfo &STI) const {
1073 const MCOperand &MO = MI.getOperand(OpIdx);
1074 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1075 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1076 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1077 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1078 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
1079 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
1080 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
1081 unsigned SBits = getShiftOp(ShOp);
1083 // While "lsr #32" and "asr #32" exist, they are encoded with a 0 in the shift
1084 // amount. However, it would be an easy mistake to make so check here.
1085 assert((ShImm & ~0x1f) == 0 && "Out of range shift amount");
1094 uint32_t Binary = Rm;
1096 Binary |= SBits << 5;
1097 Binary |= ShImm << 7;
1103 uint32_t ARMMCCodeEmitter::
1104 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
1105 SmallVectorImpl<MCFixup> &Fixups,
1106 const MCSubtargetInfo &STI) const {
1108 // {13} 1 == imm12, 0 == Rm
1111 const MCOperand &MO = MI.getOperand(OpIdx);
1112 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1113 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups, STI);
1118 uint32_t ARMMCCodeEmitter::
1119 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1120 SmallVectorImpl<MCFixup> &Fixups,
1121 const MCSubtargetInfo &STI) const {
1122 // {13} 1 == imm12, 0 == Rm
1125 const MCOperand &MO = MI.getOperand(OpIdx);
1126 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1127 unsigned Imm = MO1.getImm();
1128 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
1129 bool isReg = MO.getReg() != 0;
1130 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
1131 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
1133 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
1134 Binary <<= 7; // Shift amount is bits [11:7]
1135 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
1136 Binary |= CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); // Rm is bits [3:0]
1138 return Binary | (isAdd << 12) | (isReg << 13);
1141 uint32_t ARMMCCodeEmitter::
1142 getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
1143 SmallVectorImpl<MCFixup> &Fixups,
1144 const MCSubtargetInfo &STI) const {
1147 const MCOperand &MO = MI.getOperand(OpIdx);
1148 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1149 bool isAdd = MO1.getImm() != 0;
1150 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()) | (isAdd << 4);
1153 uint32_t ARMMCCodeEmitter::
1154 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1155 SmallVectorImpl<MCFixup> &Fixups,
1156 const MCSubtargetInfo &STI) const {
1157 // {9} 1 == imm8, 0 == Rm
1159 // {7-4} imm7_4/zero
1161 const MCOperand &MO = MI.getOperand(OpIdx);
1162 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1163 unsigned Imm = MO1.getImm();
1164 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1165 bool isImm = MO.getReg() == 0;
1166 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1167 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1169 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1170 return Imm8 | (isAdd << 8) | (isImm << 9);
1173 uint32_t ARMMCCodeEmitter::
1174 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
1175 SmallVectorImpl<MCFixup> &Fixups,
1176 const MCSubtargetInfo &STI) const {
1177 // {13} 1 == imm8, 0 == Rm
1180 // {7-4} imm7_4/zero
1182 const MCOperand &MO = MI.getOperand(OpIdx);
1183 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1184 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1186 // If The first operand isn't a register, we have a label reference.
1188 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1190 assert(MO.isExpr() && "Unexpected machine operand type!");
1191 const MCExpr *Expr = MO.getExpr();
1192 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10_unscaled);
1193 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1195 ++MCNumCPRelocations;
1196 return (Rn << 9) | (1 << 13);
1198 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1199 unsigned Imm = MO2.getImm();
1200 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1201 bool isImm = MO1.getReg() == 0;
1202 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1203 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1205 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1206 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
1209 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
1210 uint32_t ARMMCCodeEmitter::
1211 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
1212 SmallVectorImpl<MCFixup> &Fixups,
1213 const MCSubtargetInfo &STI) const {
1216 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1217 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
1218 "Unexpected base register!");
1220 // The immediate is already shifted for the implicit zeroes, so no change
1222 return MO1.getImm() & 0xff;
1225 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
1226 uint32_t ARMMCCodeEmitter::
1227 getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
1228 SmallVectorImpl<MCFixup> &Fixups,
1229 const MCSubtargetInfo &STI) const {
1233 const MCOperand &MO = MI.getOperand(OpIdx);
1234 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1235 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1236 unsigned Imm5 = MO1.getImm();
1237 return ((Imm5 & 0x1f) << 3) | Rn;
1240 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
1241 uint32_t ARMMCCodeEmitter::
1242 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
1243 SmallVectorImpl<MCFixup> &Fixups,
1244 const MCSubtargetInfo &STI) const {
1245 const MCOperand MO = MI.getOperand(OpIdx);
1247 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups, STI);
1248 return (MO.getImm() >> 2);
1251 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
1252 uint32_t ARMMCCodeEmitter::
1253 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
1254 SmallVectorImpl<MCFixup> &Fixups,
1255 const MCSubtargetInfo &STI) const {
1257 // {8} = (U)nsigned (add == '1', sub == '0')
1261 // If The first operand isn't a register, we have a label reference.
1262 const MCOperand &MO = MI.getOperand(OpIdx);
1264 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1266 isAdd = false; // 'U' bit is handled as part of the fixup.
1268 assert(MO.isExpr() && "Unexpected machine operand type!");
1269 const MCExpr *Expr = MO.getExpr();
1272 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
1274 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
1275 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1277 ++MCNumCPRelocations;
1279 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
1280 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
1283 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
1284 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1287 Binary |= (Reg << 9);
1291 unsigned ARMMCCodeEmitter::
1292 getSORegRegOpValue(const MCInst &MI, unsigned OpIdx,
1293 SmallVectorImpl<MCFixup> &Fixups,
1294 const MCSubtargetInfo &STI) const {
1295 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
1296 // shifted. The second is Rs, the amount to shift by, and the third specifies
1297 // the type of the shift.
1305 const MCOperand &MO = MI.getOperand(OpIdx);
1306 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1307 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
1308 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
1311 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1313 // Encode the shift opcode.
1315 unsigned Rs = MO1.getReg();
1317 // Set shift operand (bit[7:4]).
1323 default: llvm_unreachable("Unknown shift opc!");
1324 case ARM_AM::lsl: SBits = 0x1; break;
1325 case ARM_AM::lsr: SBits = 0x3; break;
1326 case ARM_AM::asr: SBits = 0x5; break;
1327 case ARM_AM::ror: SBits = 0x7; break;
1331 Binary |= SBits << 4;
1333 // Encode the shift operation Rs.
1334 // Encode Rs bit[11:8].
1335 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
1336 return Binary | (CTX.getRegisterInfo()->getEncodingValue(Rs) << ARMII::RegRsShift);
1339 unsigned ARMMCCodeEmitter::
1340 getSORegImmOpValue(const MCInst &MI, unsigned OpIdx,
1341 SmallVectorImpl<MCFixup> &Fixups,
1342 const MCSubtargetInfo &STI) const {
1343 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1344 // shifted. The second is the amount to shift by.
1351 const MCOperand &MO = MI.getOperand(OpIdx);
1352 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1353 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1356 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1358 // Encode the shift opcode.
1361 // Set shift operand (bit[6:4]).
1366 // RRX - 110 and bit[11:8] clear.
1368 default: llvm_unreachable("Unknown shift opc!");
1369 case ARM_AM::lsl: SBits = 0x0; break;
1370 case ARM_AM::lsr: SBits = 0x2; break;
1371 case ARM_AM::asr: SBits = 0x4; break;
1372 case ARM_AM::ror: SBits = 0x6; break;
1378 // Encode shift_imm bit[11:7].
1379 Binary |= SBits << 4;
1380 unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm());
1381 assert(Offset < 32 && "Offset must be in range 0-31!");
1382 return Binary | (Offset << 7);
1386 unsigned ARMMCCodeEmitter::
1387 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
1388 SmallVectorImpl<MCFixup> &Fixups,
1389 const MCSubtargetInfo &STI) const {
1390 const MCOperand &MO1 = MI.getOperand(OpNum);
1391 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1392 const MCOperand &MO3 = MI.getOperand(OpNum+2);
1394 // Encoded as [Rn, Rm, imm].
1395 // FIXME: Needs fixup support.
1396 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1398 Value |= CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
1400 Value |= MO3.getImm();
1405 unsigned ARMMCCodeEmitter::
1406 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
1407 SmallVectorImpl<MCFixup> &Fixups,
1408 const MCSubtargetInfo &STI) const {
1409 const MCOperand &MO1 = MI.getOperand(OpNum);
1410 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1412 // FIXME: Needs fixup support.
1413 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1415 // Even though the immediate is 8 bits long, we need 9 bits in order
1416 // to represent the (inverse of the) sign bit.
1418 int32_t tmp = (int32_t)MO2.getImm();
1422 Value |= 256; // Set the ADD bit
1427 unsigned ARMMCCodeEmitter::
1428 getT2AddrModeImm8OffsetOpValue(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 |= 256; // Set the ADD bit
1444 unsigned ARMMCCodeEmitter::
1445 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
1446 SmallVectorImpl<MCFixup> &Fixups,
1447 const MCSubtargetInfo &STI) const {
1448 const MCOperand &MO1 = MI.getOperand(OpNum);
1450 // FIXME: Needs fixup support.
1452 int32_t tmp = (int32_t)MO1.getImm();
1456 Value |= 4096; // Set the ADD bit
1457 Value |= tmp & 4095;
1461 unsigned ARMMCCodeEmitter::
1462 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1463 SmallVectorImpl<MCFixup> &Fixups,
1464 const MCSubtargetInfo &STI) const {
1465 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1466 // shifted. The second is the amount to shift by.
1473 const MCOperand &MO = MI.getOperand(OpIdx);
1474 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1475 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1478 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1480 // Encode the shift opcode.
1482 // Set shift operand (bit[6:4]).
1488 default: llvm_unreachable("Unknown shift opc!");
1489 case ARM_AM::lsl: SBits = 0x0; break;
1490 case ARM_AM::lsr: SBits = 0x2; break;
1491 case ARM_AM::asr: SBits = 0x4; break;
1492 case ARM_AM::rrx: // FALLTHROUGH
1493 case ARM_AM::ror: SBits = 0x6; break;
1496 Binary |= SBits << 4;
1497 if (SOpc == ARM_AM::rrx)
1500 // Encode shift_imm bit[11:7].
1501 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1504 unsigned ARMMCCodeEmitter::
1505 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1506 SmallVectorImpl<MCFixup> &Fixups,
1507 const MCSubtargetInfo &STI) const {
1508 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1510 const MCOperand &MO = MI.getOperand(Op);
1511 uint32_t v = ~MO.getImm();
1512 uint32_t lsb = countTrailingZeros(v);
1513 uint32_t msb = (32 - countLeadingZeros (v)) - 1;
1514 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1515 return lsb | (msb << 5);
1518 unsigned ARMMCCodeEmitter::
1519 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1520 SmallVectorImpl<MCFixup> &Fixups,
1521 const MCSubtargetInfo &STI) const {
1524 // {7-0} = Number of registers
1527 // {15-0} = Bitfield of GPRs.
1528 unsigned Reg = MI.getOperand(Op).getReg();
1529 bool SPRRegs = ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg);
1530 bool DPRRegs = ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg);
1532 unsigned Binary = 0;
1534 if (SPRRegs || DPRRegs) {
1536 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
1537 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1538 Binary |= (RegNo & 0x1f) << 8;
1542 Binary |= NumRegs * 2;
1544 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1545 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(MI.getOperand(I).getReg());
1546 Binary |= 1 << RegNo;
1553 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1554 /// with the alignment operand.
1555 unsigned ARMMCCodeEmitter::
1556 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1557 SmallVectorImpl<MCFixup> &Fixups,
1558 const MCSubtargetInfo &STI) const {
1559 const MCOperand &Reg = MI.getOperand(Op);
1560 const MCOperand &Imm = MI.getOperand(Op + 1);
1562 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1565 switch (Imm.getImm()) {
1569 case 8: Align = 0x01; break;
1570 case 16: Align = 0x02; break;
1571 case 32: Align = 0x03; break;
1574 return RegNo | (Align << 4);
1577 /// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number
1578 /// along with the alignment operand for use in VST1 and VLD1 with size 32.
1579 unsigned ARMMCCodeEmitter::
1580 getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
1581 SmallVectorImpl<MCFixup> &Fixups,
1582 const MCSubtargetInfo &STI) const {
1583 const MCOperand &Reg = MI.getOperand(Op);
1584 const MCOperand &Imm = MI.getOperand(Op + 1);
1586 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1589 switch (Imm.getImm()) {
1593 case 32: // Default '0' value for invalid alignments of 8, 16, 32 bytes.
1594 case 2: Align = 0x00; break;
1595 case 4: Align = 0x03; break;
1598 return RegNo | (Align << 4);
1602 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1603 /// alignment operand for use in VLD-dup instructions. This is the same as
1604 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1605 /// different for VLD4-dup.
1606 unsigned ARMMCCodeEmitter::
1607 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1608 SmallVectorImpl<MCFixup> &Fixups,
1609 const MCSubtargetInfo &STI) const {
1610 const MCOperand &Reg = MI.getOperand(Op);
1611 const MCOperand &Imm = MI.getOperand(Op + 1);
1613 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1616 switch (Imm.getImm()) {
1620 case 8: Align = 0x01; break;
1621 case 16: Align = 0x03; break;
1624 return RegNo | (Align << 4);
1627 unsigned ARMMCCodeEmitter::
1628 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1629 SmallVectorImpl<MCFixup> &Fixups,
1630 const MCSubtargetInfo &STI) const {
1631 const MCOperand &MO = MI.getOperand(Op);
1632 if (MO.getReg() == 0) return 0x0D;
1633 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1636 unsigned ARMMCCodeEmitter::
1637 getShiftRight8Imm(const MCInst &MI, unsigned Op,
1638 SmallVectorImpl<MCFixup> &Fixups,
1639 const MCSubtargetInfo &STI) const {
1640 return 8 - MI.getOperand(Op).getImm();
1643 unsigned ARMMCCodeEmitter::
1644 getShiftRight16Imm(const MCInst &MI, unsigned Op,
1645 SmallVectorImpl<MCFixup> &Fixups,
1646 const MCSubtargetInfo &STI) const {
1647 return 16 - MI.getOperand(Op).getImm();
1650 unsigned ARMMCCodeEmitter::
1651 getShiftRight32Imm(const MCInst &MI, unsigned Op,
1652 SmallVectorImpl<MCFixup> &Fixups,
1653 const MCSubtargetInfo &STI) const {
1654 return 32 - MI.getOperand(Op).getImm();
1657 unsigned ARMMCCodeEmitter::
1658 getShiftRight64Imm(const MCInst &MI, unsigned Op,
1659 SmallVectorImpl<MCFixup> &Fixups,
1660 const MCSubtargetInfo &STI) const {
1661 return 64 - MI.getOperand(Op).getImm();
1664 void ARMMCCodeEmitter::
1665 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1666 SmallVectorImpl<MCFixup> &Fixups,
1667 const MCSubtargetInfo &STI) const {
1668 // Pseudo instructions don't get encoded.
1669 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
1670 uint64_t TSFlags = Desc.TSFlags;
1671 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1675 if (Desc.getSize() == 2 || Desc.getSize() == 4)
1676 Size = Desc.getSize();
1678 llvm_unreachable("Unexpected instruction size!");
1680 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups, STI);
1681 // Thumb 32-bit wide instructions need to emit the high order halfword
1683 if (isThumb(STI) && Size == 4) {
1684 EmitConstant(Binary >> 16, 2, OS);
1685 EmitConstant(Binary & 0xffff, 2, OS);
1687 EmitConstant(Binary, Size, OS);
1688 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1691 #include "ARMGenMCCodeEmitter.inc"