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 {
275 unsigned SoImm = MI.getOperand(Op).getImm();
276 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
277 assert(SoImmVal != -1 && "Not a valid so_imm value!");
279 // Encode rotate_imm.
280 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
281 << ARMII::SoRotImmShift;
284 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
288 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
289 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
290 SmallVectorImpl<MCFixup> &Fixups,
291 const MCSubtargetInfo &STI) const {
292 unsigned SoImm = MI.getOperand(Op).getImm();
293 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
294 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
298 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
299 SmallVectorImpl<MCFixup> &Fixups,
300 const MCSubtargetInfo &STI) const;
301 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
302 SmallVectorImpl<MCFixup> &Fixups,
303 const MCSubtargetInfo &STI) const;
304 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
305 SmallVectorImpl<MCFixup> &Fixups,
306 const MCSubtargetInfo &STI) const;
307 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
308 SmallVectorImpl<MCFixup> &Fixups,
309 const MCSubtargetInfo &STI) const;
311 /// getSORegOpValue - Return an encoded so_reg shifted register value.
312 unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op,
313 SmallVectorImpl<MCFixup> &Fixups,
314 const MCSubtargetInfo &STI) const;
315 unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op,
316 SmallVectorImpl<MCFixup> &Fixups,
317 const MCSubtargetInfo &STI) const;
318 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
319 SmallVectorImpl<MCFixup> &Fixups,
320 const MCSubtargetInfo &STI) const;
322 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
323 SmallVectorImpl<MCFixup> &Fixups,
324 const MCSubtargetInfo &STI) const {
325 return 64 - MI.getOperand(Op).getImm();
328 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
329 SmallVectorImpl<MCFixup> &Fixups,
330 const MCSubtargetInfo &STI) const;
332 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
333 SmallVectorImpl<MCFixup> &Fixups,
334 const MCSubtargetInfo &STI) const;
335 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
336 SmallVectorImpl<MCFixup> &Fixups,
337 const MCSubtargetInfo &STI) const;
338 unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
339 SmallVectorImpl<MCFixup> &Fixups,
340 const MCSubtargetInfo &STI) const;
341 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
342 SmallVectorImpl<MCFixup> &Fixups,
343 const MCSubtargetInfo &STI) const;
344 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
345 SmallVectorImpl<MCFixup> &Fixups,
346 const MCSubtargetInfo &STI) const;
348 unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op,
349 SmallVectorImpl<MCFixup> &Fixups,
350 const MCSubtargetInfo &STI) const;
351 unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op,
352 SmallVectorImpl<MCFixup> &Fixups,
353 const MCSubtargetInfo &STI) const;
354 unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op,
355 SmallVectorImpl<MCFixup> &Fixups,
356 const MCSubtargetInfo &STI) const;
357 unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op,
358 SmallVectorImpl<MCFixup> &Fixups,
359 const MCSubtargetInfo &STI) const;
361 unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op,
362 SmallVectorImpl<MCFixup> &Fixups,
363 const MCSubtargetInfo &STI) const;
365 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
366 unsigned EncodedValue,
367 const MCSubtargetInfo &STI) const;
368 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
369 unsigned EncodedValue,
370 const MCSubtargetInfo &STI) const;
371 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
372 unsigned EncodedValue,
373 const MCSubtargetInfo &STI) const;
374 unsigned NEONThumb2V8PostEncoder(const MCInst &MI,
375 unsigned EncodedValue,
376 const MCSubtargetInfo &STI) const;
378 unsigned VFPThumb2PostEncoder(const MCInst &MI,
379 unsigned EncodedValue,
380 const MCSubtargetInfo &STI) const;
382 void EmitByte(unsigned char C, raw_ostream &OS) const {
386 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
387 // Output the constant in little endian byte order.
388 for (unsigned i = 0; i != Size; ++i) {
389 unsigned Shift = IsLittleEndian ? i * 8 : (Size - 1 - i) * 8;
390 EmitByte((Val >> Shift) & 0xff, OS);
394 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
395 SmallVectorImpl<MCFixup> &Fixups,
396 const MCSubtargetInfo &STI) const override;
399 } // end anonymous namespace
401 MCCodeEmitter *llvm::createARMleMCCodeEmitter(const MCInstrInfo &MCII,
402 const MCRegisterInfo &MRI,
403 const MCSubtargetInfo &STI,
405 return new ARMMCCodeEmitter(MCII, Ctx, true);
408 MCCodeEmitter *llvm::createARMbeMCCodeEmitter(const MCInstrInfo &MCII,
409 const MCRegisterInfo &MRI,
410 const MCSubtargetInfo &STI,
412 return new ARMMCCodeEmitter(MCII, Ctx, false);
415 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
416 /// instructions, and rewrite them to their Thumb2 form if we are currently in
418 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
419 unsigned EncodedValue,
420 const MCSubtargetInfo &STI) const {
422 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
423 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
425 unsigned Bit24 = EncodedValue & 0x01000000;
426 unsigned Bit28 = Bit24 << 4;
427 EncodedValue &= 0xEFFFFFFF;
428 EncodedValue |= Bit28;
429 EncodedValue |= 0x0F000000;
435 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
436 /// instructions, and rewrite them to their Thumb2 form if we are currently in
438 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
439 unsigned EncodedValue,
440 const MCSubtargetInfo &STI) const {
442 EncodedValue &= 0xF0FFFFFF;
443 EncodedValue |= 0x09000000;
449 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
450 /// instructions, and rewrite them to their Thumb2 form if we are currently in
452 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
453 unsigned EncodedValue,
454 const MCSubtargetInfo &STI) const {
456 EncodedValue &= 0x00FFFFFF;
457 EncodedValue |= 0xEE000000;
463 /// Post-process encoded NEON v8 instructions, and rewrite them to Thumb2 form
464 /// if we are in Thumb2.
465 unsigned ARMMCCodeEmitter::NEONThumb2V8PostEncoder(const MCInst &MI,
466 unsigned EncodedValue,
467 const MCSubtargetInfo &STI) const {
469 EncodedValue |= 0xC000000; // Set bits 27-26
475 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
476 /// them to their Thumb2 form if we are currently in Thumb2 mode.
477 unsigned ARMMCCodeEmitter::
478 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue,
479 const MCSubtargetInfo &STI) const {
481 EncodedValue &= 0x0FFFFFFF;
482 EncodedValue |= 0xE0000000;
487 /// getMachineOpValue - Return binary encoding of operand. If the machine
488 /// operand requires relocation, record the relocation and return zero.
489 unsigned ARMMCCodeEmitter::
490 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
491 SmallVectorImpl<MCFixup> &Fixups,
492 const MCSubtargetInfo &STI) const {
494 unsigned Reg = MO.getReg();
495 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
497 // Q registers are encoded as 2x their register number.
501 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
502 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
503 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
504 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
507 } else if (MO.isImm()) {
508 return static_cast<unsigned>(MO.getImm());
509 } else if (MO.isFPImm()) {
510 return static_cast<unsigned>(APFloat(MO.getFPImm())
511 .bitcastToAPInt().getHiBits(32).getLimitedValue());
514 llvm_unreachable("Unable to encode MCOperand!");
517 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
518 bool ARMMCCodeEmitter::
519 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
520 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups,
521 const MCSubtargetInfo &STI) const {
522 const MCOperand &MO = MI.getOperand(OpIdx);
523 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
525 Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
527 int32_t SImm = MO1.getImm();
530 // Special value for #-0
531 if (SImm == INT32_MIN) {
536 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
546 /// getBranchTargetOpValue - Helper function to get the branch target operand,
547 /// which is either an immediate or requires a fixup.
548 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
550 SmallVectorImpl<MCFixup> &Fixups,
551 const MCSubtargetInfo &STI) {
552 const MCOperand &MO = MI.getOperand(OpIdx);
554 // If the destination is an immediate, we have nothing to do.
555 if (MO.isImm()) return MO.getImm();
556 assert(MO.isExpr() && "Unexpected branch target type!");
557 const MCExpr *Expr = MO.getExpr();
558 MCFixupKind Kind = MCFixupKind(FixupKind);
559 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
561 // All of the information is in the fixup.
565 // Thumb BL and BLX use a strange offset encoding where bits 22 and 21 are
566 // determined by negating them and XOR'ing them with bit 23.
567 static int32_t encodeThumbBLOffset(int32_t offset) {
569 uint32_t S = (offset & 0x800000) >> 23;
570 uint32_t J1 = (offset & 0x400000) >> 22;
571 uint32_t J2 = (offset & 0x200000) >> 21;
584 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
585 uint32_t ARMMCCodeEmitter::
586 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
587 SmallVectorImpl<MCFixup> &Fixups,
588 const MCSubtargetInfo &STI) const {
589 const MCOperand MO = MI.getOperand(OpIdx);
591 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl,
593 return encodeThumbBLOffset(MO.getImm());
596 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
597 /// BLX branch target.
598 uint32_t ARMMCCodeEmitter::
599 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
600 SmallVectorImpl<MCFixup> &Fixups,
601 const MCSubtargetInfo &STI) const {
602 const MCOperand MO = MI.getOperand(OpIdx);
604 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx,
606 return encodeThumbBLOffset(MO.getImm());
609 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
610 uint32_t ARMMCCodeEmitter::
611 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
612 SmallVectorImpl<MCFixup> &Fixups,
613 const MCSubtargetInfo &STI) const {
614 const MCOperand MO = MI.getOperand(OpIdx);
616 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br,
618 return (MO.getImm() >> 1);
621 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
622 uint32_t ARMMCCodeEmitter::
623 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
624 SmallVectorImpl<MCFixup> &Fixups,
625 const MCSubtargetInfo &STI) const {
626 const MCOperand MO = MI.getOperand(OpIdx);
628 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc,
630 return (MO.getImm() >> 1);
633 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
634 uint32_t ARMMCCodeEmitter::
635 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
636 SmallVectorImpl<MCFixup> &Fixups,
637 const MCSubtargetInfo &STI) const {
638 const MCOperand MO = MI.getOperand(OpIdx);
640 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups, STI);
641 return (MO.getImm() >> 1);
644 /// Return true if this branch has a non-always predication
645 static bool HasConditionalBranch(const MCInst &MI) {
646 int NumOp = MI.getNumOperands();
648 for (int i = 0; i < NumOp-1; ++i) {
649 const MCOperand &MCOp1 = MI.getOperand(i);
650 const MCOperand &MCOp2 = MI.getOperand(i + 1);
651 if (MCOp1.isImm() && MCOp2.isReg() &&
652 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
653 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
661 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
663 uint32_t ARMMCCodeEmitter::
664 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
665 SmallVectorImpl<MCFixup> &Fixups,
666 const MCSubtargetInfo &STI) const {
667 // FIXME: This really, really shouldn't use TargetMachine. We don't want
668 // coupling between MC and TM anywhere we can help it.
671 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups, STI);
672 return getARMBranchTargetOpValue(MI, OpIdx, Fixups, STI);
675 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
677 uint32_t ARMMCCodeEmitter::
678 getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
679 SmallVectorImpl<MCFixup> &Fixups,
680 const MCSubtargetInfo &STI) const {
681 const MCOperand MO = MI.getOperand(OpIdx);
683 if (HasConditionalBranch(MI))
684 return ::getBranchTargetOpValue(MI, OpIdx,
685 ARM::fixup_arm_condbranch, Fixups, STI);
686 return ::getBranchTargetOpValue(MI, OpIdx,
687 ARM::fixup_arm_uncondbranch, Fixups, STI);
690 return MO.getImm() >> 2;
693 uint32_t ARMMCCodeEmitter::
694 getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
695 SmallVectorImpl<MCFixup> &Fixups,
696 const MCSubtargetInfo &STI) const {
697 const MCOperand MO = MI.getOperand(OpIdx);
699 if (HasConditionalBranch(MI))
700 return ::getBranchTargetOpValue(MI, OpIdx,
701 ARM::fixup_arm_condbl, Fixups, STI);
702 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_uncondbl, Fixups, STI);
705 return MO.getImm() >> 2;
708 uint32_t ARMMCCodeEmitter::
709 getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
710 SmallVectorImpl<MCFixup> &Fixups,
711 const MCSubtargetInfo &STI) const {
712 const MCOperand MO = MI.getOperand(OpIdx);
714 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_blx, Fixups, STI);
716 return MO.getImm() >> 1;
719 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
720 /// immediate branch target.
721 uint32_t ARMMCCodeEmitter::
722 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
723 SmallVectorImpl<MCFixup> &Fixups,
724 const MCSubtargetInfo &STI) const {
726 const MCOperand MO = MI.getOperand(OpIdx);
729 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups, STI);
731 Val = MO.getImm() >> 1;
733 bool I = (Val & 0x800000);
734 bool J1 = (Val & 0x400000);
735 bool J2 = (Val & 0x200000);
749 /// getAdrLabelOpValue - Return encoding info for 12-bit shifted-immediate
750 /// ADR label target.
751 uint32_t ARMMCCodeEmitter::
752 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
753 SmallVectorImpl<MCFixup> &Fixups,
754 const MCSubtargetInfo &STI) const {
755 const MCOperand MO = MI.getOperand(OpIdx);
757 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
759 int64_t offset = MO.getImm();
760 uint32_t Val = 0x2000;
763 if (offset == INT32_MIN) {
766 } else if (offset < 0) {
769 SoImmVal = ARM_AM::getSOImmVal(offset);
773 SoImmVal = ARM_AM::getSOImmVal(offset);
776 SoImmVal = ARM_AM::getSOImmVal(offset);
780 SoImmVal = ARM_AM::getSOImmVal(offset);
784 assert(SoImmVal != -1 && "Not a valid so_imm value!");
790 /// getT2AdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
792 uint32_t ARMMCCodeEmitter::
793 getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
794 SmallVectorImpl<MCFixup> &Fixups,
795 const MCSubtargetInfo &STI) const {
796 const MCOperand MO = MI.getOperand(OpIdx);
798 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
800 int32_t Val = MO.getImm();
801 if (Val == INT32_MIN)
810 /// getThumbAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label
812 uint32_t ARMMCCodeEmitter::
813 getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
814 SmallVectorImpl<MCFixup> &Fixups,
815 const MCSubtargetInfo &STI) const {
816 const MCOperand MO = MI.getOperand(OpIdx);
818 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10,
823 /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg'
825 uint32_t ARMMCCodeEmitter::
826 getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
827 SmallVectorImpl<MCFixup> &,
828 const MCSubtargetInfo &STI) const {
832 const MCOperand &MO1 = MI.getOperand(OpIdx);
833 const MCOperand &MO2 = MI.getOperand(OpIdx + 1);
834 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
835 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
836 return (Rm << 3) | Rn;
839 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
840 uint32_t ARMMCCodeEmitter::
841 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
842 SmallVectorImpl<MCFixup> &Fixups,
843 const MCSubtargetInfo &STI) const {
845 // {12} = (U)nsigned (add == '1', sub == '0')
849 // If The first operand isn't a register, we have a label reference.
850 const MCOperand &MO = MI.getOperand(OpIdx);
852 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
856 const MCExpr *Expr = MO.getExpr();
857 isAdd = false ; // 'U' bit is set as part of the fixup.
861 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
863 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
864 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
866 ++MCNumCPRelocations;
869 int32_t Offset = MO.getImm();
870 if (Offset == INT32_MIN) {
873 } else if (Offset < 0) {
880 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups, STI);
882 uint32_t Binary = Imm12 & 0xfff;
883 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
886 Binary |= (Reg << 13);
890 /// getT2Imm8s4OpValue - Return encoding info for
891 /// '+/- imm8<<2' operand.
892 uint32_t ARMMCCodeEmitter::
893 getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
894 SmallVectorImpl<MCFixup> &Fixups,
895 const MCSubtargetInfo &STI) const {
896 // FIXME: The immediate operand should have already been encoded like this
897 // before ever getting here. The encoder method should just need to combine
898 // the MI operands for the register and the offset into a single
899 // representation for the complex operand in the .td file. This isn't just
900 // style, unfortunately. As-is, we can't represent the distinct encoding
903 // {8} = (U)nsigned (add == '1', sub == '0')
905 int32_t Imm8 = MI.getOperand(OpIdx).getImm();
906 bool isAdd = Imm8 >= 0;
908 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
910 Imm8 = -(uint32_t)Imm8;
915 uint32_t Binary = Imm8 & 0xff;
916 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
922 /// getT2AddrModeImm8s4OpValue - Return encoding info for
923 /// 'reg +/- imm8<<2' operand.
924 uint32_t ARMMCCodeEmitter::
925 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
926 SmallVectorImpl<MCFixup> &Fixups,
927 const MCSubtargetInfo &STI) const {
929 // {8} = (U)nsigned (add == '1', sub == '0')
933 // If The first operand isn't a register, we have a label reference.
934 const MCOperand &MO = MI.getOperand(OpIdx);
936 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
938 isAdd = false ; // 'U' bit is set as part of the fixup.
940 assert(MO.isExpr() && "Unexpected machine operand type!");
941 const MCExpr *Expr = MO.getExpr();
942 MCFixupKind Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
943 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
945 ++MCNumCPRelocations;
947 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
949 // FIXME: The immediate operand should have already been encoded like this
950 // before ever getting here. The encoder method should just need to combine
951 // the MI operands for the register and the offset into a single
952 // representation for the complex operand in the .td file. This isn't just
953 // style, unfortunately. As-is, we can't represent the distinct encoding
955 uint32_t Binary = (Imm8 >> 2) & 0xff;
956 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
959 Binary |= (Reg << 9);
963 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for
964 /// 'reg + imm8<<2' operand.
965 uint32_t ARMMCCodeEmitter::
966 getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
967 SmallVectorImpl<MCFixup> &Fixups,
968 const MCSubtargetInfo &STI) const {
971 const MCOperand &MO = MI.getOperand(OpIdx);
972 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
973 unsigned Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
974 unsigned Imm8 = MO1.getImm();
975 return (Reg << 8) | Imm8;
978 // FIXME: This routine assumes that a binary
979 // expression will always result in a PCRel expression
980 // In reality, its only true if one or more subexpressions
981 // is itself a PCRel (i.e. "." in asm or some other pcrel construct)
982 // but this is good enough for now.
983 static bool EvaluateAsPCRel(const MCExpr *Expr) {
984 switch (Expr->getKind()) {
985 default: llvm_unreachable("Unexpected expression type");
986 case MCExpr::SymbolRef: return false;
987 case MCExpr::Binary: return true;
992 ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
993 SmallVectorImpl<MCFixup> &Fixups,
994 const MCSubtargetInfo &STI) const {
995 // {20-16} = imm{15-12}
996 // {11-0} = imm{11-0}
997 const MCOperand &MO = MI.getOperand(OpIdx);
999 // Hi / lo 16 bits already extracted during earlier passes.
1000 return static_cast<unsigned>(MO.getImm());
1002 // Handle :upper16: and :lower16: assembly prefixes.
1003 const MCExpr *E = MO.getExpr();
1005 if (E->getKind() == MCExpr::Target) {
1006 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E);
1007 E = ARM16Expr->getSubExpr();
1009 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(E)) {
1010 const int64_t Value = MCE->getValue();
1011 if (Value > UINT32_MAX)
1012 report_fatal_error("constant value truncated (limited to 32-bit)");
1014 switch (ARM16Expr->getKind()) {
1015 case ARMMCExpr::VK_ARM_HI16:
1016 return (int32_t(Value) & 0xffff0000) >> 16;
1017 case ARMMCExpr::VK_ARM_LO16:
1018 return (int32_t(Value) & 0x0000ffff);
1019 default: llvm_unreachable("Unsupported ARMFixup");
1023 switch (ARM16Expr->getKind()) {
1024 default: llvm_unreachable("Unsupported ARMFixup");
1025 case ARMMCExpr::VK_ARM_HI16:
1026 if (!isTargetMachO(STI) && EvaluateAsPCRel(E))
1027 Kind = MCFixupKind(isThumb2(STI)
1028 ? ARM::fixup_t2_movt_hi16_pcrel
1029 : ARM::fixup_arm_movt_hi16_pcrel);
1031 Kind = MCFixupKind(isThumb2(STI)
1032 ? ARM::fixup_t2_movt_hi16
1033 : ARM::fixup_arm_movt_hi16);
1035 case ARMMCExpr::VK_ARM_LO16:
1036 if (!isTargetMachO(STI) && EvaluateAsPCRel(E))
1037 Kind = MCFixupKind(isThumb2(STI)
1038 ? ARM::fixup_t2_movw_lo16_pcrel
1039 : ARM::fixup_arm_movw_lo16_pcrel);
1041 Kind = MCFixupKind(isThumb2(STI)
1042 ? ARM::fixup_t2_movw_lo16
1043 : ARM::fixup_arm_movw_lo16);
1046 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc()));
1049 // If the expression doesn't have :upper16: or :lower16: on it,
1050 // it's just a plain immediate expression, and those evaluate to
1051 // the lower 16 bits of the expression regardless of whether
1052 // we have a movt or a movw.
1053 if (!isTargetMachO(STI) && EvaluateAsPCRel(E))
1054 Kind = MCFixupKind(isThumb2(STI)
1055 ? ARM::fixup_t2_movw_lo16_pcrel
1056 : ARM::fixup_arm_movw_lo16_pcrel);
1058 Kind = MCFixupKind(isThumb2(STI)
1059 ? ARM::fixup_t2_movw_lo16
1060 : ARM::fixup_arm_movw_lo16);
1061 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc()));
1065 uint32_t ARMMCCodeEmitter::
1066 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
1067 SmallVectorImpl<MCFixup> &Fixups,
1068 const MCSubtargetInfo &STI) const {
1069 const MCOperand &MO = MI.getOperand(OpIdx);
1070 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1071 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1072 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1073 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1074 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
1075 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
1076 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
1077 unsigned SBits = getShiftOp(ShOp);
1079 // While "lsr #32" and "asr #32" exist, they are encoded with a 0 in the shift
1080 // amount. However, it would be an easy mistake to make so check here.
1081 assert((ShImm & ~0x1f) == 0 && "Out of range shift amount");
1090 uint32_t Binary = Rm;
1092 Binary |= SBits << 5;
1093 Binary |= ShImm << 7;
1099 uint32_t ARMMCCodeEmitter::
1100 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
1101 SmallVectorImpl<MCFixup> &Fixups,
1102 const MCSubtargetInfo &STI) const {
1104 // {13} 1 == imm12, 0 == Rm
1107 const MCOperand &MO = MI.getOperand(OpIdx);
1108 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1109 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups, STI);
1114 uint32_t ARMMCCodeEmitter::
1115 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1116 SmallVectorImpl<MCFixup> &Fixups,
1117 const MCSubtargetInfo &STI) const {
1118 // {13} 1 == imm12, 0 == Rm
1121 const MCOperand &MO = MI.getOperand(OpIdx);
1122 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1123 unsigned Imm = MO1.getImm();
1124 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
1125 bool isReg = MO.getReg() != 0;
1126 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
1127 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
1129 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
1130 Binary <<= 7; // Shift amount is bits [11:7]
1131 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
1132 Binary |= CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); // Rm is bits [3:0]
1134 return Binary | (isAdd << 12) | (isReg << 13);
1137 uint32_t ARMMCCodeEmitter::
1138 getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
1139 SmallVectorImpl<MCFixup> &Fixups,
1140 const MCSubtargetInfo &STI) const {
1143 const MCOperand &MO = MI.getOperand(OpIdx);
1144 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1145 bool isAdd = MO1.getImm() != 0;
1146 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()) | (isAdd << 4);
1149 uint32_t ARMMCCodeEmitter::
1150 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1151 SmallVectorImpl<MCFixup> &Fixups,
1152 const MCSubtargetInfo &STI) const {
1153 // {9} 1 == imm8, 0 == Rm
1155 // {7-4} imm7_4/zero
1157 const MCOperand &MO = MI.getOperand(OpIdx);
1158 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1159 unsigned Imm = MO1.getImm();
1160 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1161 bool isImm = MO.getReg() == 0;
1162 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1163 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1165 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1166 return Imm8 | (isAdd << 8) | (isImm << 9);
1169 uint32_t ARMMCCodeEmitter::
1170 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
1171 SmallVectorImpl<MCFixup> &Fixups,
1172 const MCSubtargetInfo &STI) const {
1173 // {13} 1 == imm8, 0 == Rm
1176 // {7-4} imm7_4/zero
1178 const MCOperand &MO = MI.getOperand(OpIdx);
1179 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1180 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1182 // If The first operand isn't a register, we have a label reference.
1184 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1186 assert(MO.isExpr() && "Unexpected machine operand type!");
1187 const MCExpr *Expr = MO.getExpr();
1188 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10_unscaled);
1189 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1191 ++MCNumCPRelocations;
1192 return (Rn << 9) | (1 << 13);
1194 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1195 unsigned Imm = MO2.getImm();
1196 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1197 bool isImm = MO1.getReg() == 0;
1198 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1199 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1201 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1202 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
1205 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
1206 uint32_t ARMMCCodeEmitter::
1207 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
1208 SmallVectorImpl<MCFixup> &Fixups,
1209 const MCSubtargetInfo &STI) const {
1212 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1213 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
1214 "Unexpected base register!");
1216 // The immediate is already shifted for the implicit zeroes, so no change
1218 return MO1.getImm() & 0xff;
1221 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
1222 uint32_t ARMMCCodeEmitter::
1223 getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
1224 SmallVectorImpl<MCFixup> &Fixups,
1225 const MCSubtargetInfo &STI) const {
1229 const MCOperand &MO = MI.getOperand(OpIdx);
1230 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1231 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1232 unsigned Imm5 = MO1.getImm();
1233 return ((Imm5 & 0x1f) << 3) | Rn;
1236 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
1237 uint32_t ARMMCCodeEmitter::
1238 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
1239 SmallVectorImpl<MCFixup> &Fixups,
1240 const MCSubtargetInfo &STI) const {
1241 const MCOperand MO = MI.getOperand(OpIdx);
1243 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups, STI);
1244 return (MO.getImm() >> 2);
1247 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
1248 uint32_t ARMMCCodeEmitter::
1249 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
1250 SmallVectorImpl<MCFixup> &Fixups,
1251 const MCSubtargetInfo &STI) const {
1253 // {8} = (U)nsigned (add == '1', sub == '0')
1257 // If The first operand isn't a register, we have a label reference.
1258 const MCOperand &MO = MI.getOperand(OpIdx);
1260 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1262 isAdd = false; // 'U' bit is handled as part of the fixup.
1264 assert(MO.isExpr() && "Unexpected machine operand type!");
1265 const MCExpr *Expr = MO.getExpr();
1268 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
1270 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
1271 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1273 ++MCNumCPRelocations;
1275 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
1276 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
1279 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
1280 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1283 Binary |= (Reg << 9);
1287 unsigned ARMMCCodeEmitter::
1288 getSORegRegOpValue(const MCInst &MI, unsigned OpIdx,
1289 SmallVectorImpl<MCFixup> &Fixups,
1290 const MCSubtargetInfo &STI) const {
1291 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
1292 // shifted. The second is Rs, the amount to shift by, and the third specifies
1293 // the type of the shift.
1301 const MCOperand &MO = MI.getOperand(OpIdx);
1302 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1303 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
1304 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
1307 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1309 // Encode the shift opcode.
1311 unsigned Rs = MO1.getReg();
1313 // Set shift operand (bit[7:4]).
1319 default: llvm_unreachable("Unknown shift opc!");
1320 case ARM_AM::lsl: SBits = 0x1; break;
1321 case ARM_AM::lsr: SBits = 0x3; break;
1322 case ARM_AM::asr: SBits = 0x5; break;
1323 case ARM_AM::ror: SBits = 0x7; break;
1327 Binary |= SBits << 4;
1329 // Encode the shift operation Rs.
1330 // Encode Rs bit[11:8].
1331 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
1332 return Binary | (CTX.getRegisterInfo()->getEncodingValue(Rs) << ARMII::RegRsShift);
1335 unsigned ARMMCCodeEmitter::
1336 getSORegImmOpValue(const MCInst &MI, unsigned OpIdx,
1337 SmallVectorImpl<MCFixup> &Fixups,
1338 const MCSubtargetInfo &STI) const {
1339 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1340 // shifted. The second is the amount to shift by.
1347 const MCOperand &MO = MI.getOperand(OpIdx);
1348 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1349 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1352 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1354 // Encode the shift opcode.
1357 // Set shift operand (bit[6:4]).
1362 // RRX - 110 and bit[11:8] clear.
1364 default: llvm_unreachable("Unknown shift opc!");
1365 case ARM_AM::lsl: SBits = 0x0; break;
1366 case ARM_AM::lsr: SBits = 0x2; break;
1367 case ARM_AM::asr: SBits = 0x4; break;
1368 case ARM_AM::ror: SBits = 0x6; break;
1374 // Encode shift_imm bit[11:7].
1375 Binary |= SBits << 4;
1376 unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm());
1377 assert(Offset < 32 && "Offset must be in range 0-31!");
1378 return Binary | (Offset << 7);
1382 unsigned ARMMCCodeEmitter::
1383 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
1384 SmallVectorImpl<MCFixup> &Fixups,
1385 const MCSubtargetInfo &STI) const {
1386 const MCOperand &MO1 = MI.getOperand(OpNum);
1387 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1388 const MCOperand &MO3 = MI.getOperand(OpNum+2);
1390 // Encoded as [Rn, Rm, imm].
1391 // FIXME: Needs fixup support.
1392 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1394 Value |= CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
1396 Value |= MO3.getImm();
1401 unsigned ARMMCCodeEmitter::
1402 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
1403 SmallVectorImpl<MCFixup> &Fixups,
1404 const MCSubtargetInfo &STI) const {
1405 const MCOperand &MO1 = MI.getOperand(OpNum);
1406 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1408 // FIXME: Needs fixup support.
1409 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1411 // Even though the immediate is 8 bits long, we need 9 bits in order
1412 // to represent the (inverse of the) sign bit.
1414 int32_t tmp = (int32_t)MO2.getImm();
1418 Value |= 256; // Set the ADD bit
1423 unsigned ARMMCCodeEmitter::
1424 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
1425 SmallVectorImpl<MCFixup> &Fixups,
1426 const MCSubtargetInfo &STI) const {
1427 const MCOperand &MO1 = MI.getOperand(OpNum);
1429 // FIXME: Needs fixup support.
1431 int32_t tmp = (int32_t)MO1.getImm();
1435 Value |= 256; // Set the ADD bit
1440 unsigned ARMMCCodeEmitter::
1441 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
1442 SmallVectorImpl<MCFixup> &Fixups,
1443 const MCSubtargetInfo &STI) const {
1444 const MCOperand &MO1 = MI.getOperand(OpNum);
1446 // FIXME: Needs fixup support.
1448 int32_t tmp = (int32_t)MO1.getImm();
1452 Value |= 4096; // Set the ADD bit
1453 Value |= tmp & 4095;
1457 unsigned ARMMCCodeEmitter::
1458 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1459 SmallVectorImpl<MCFixup> &Fixups,
1460 const MCSubtargetInfo &STI) const {
1461 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1462 // shifted. The second is the amount to shift by.
1469 const MCOperand &MO = MI.getOperand(OpIdx);
1470 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1471 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1474 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1476 // Encode the shift opcode.
1478 // Set shift operand (bit[6:4]).
1484 default: llvm_unreachable("Unknown shift opc!");
1485 case ARM_AM::lsl: SBits = 0x0; break;
1486 case ARM_AM::lsr: SBits = 0x2; break;
1487 case ARM_AM::asr: SBits = 0x4; break;
1488 case ARM_AM::rrx: // FALLTHROUGH
1489 case ARM_AM::ror: SBits = 0x6; break;
1492 Binary |= SBits << 4;
1493 if (SOpc == ARM_AM::rrx)
1496 // Encode shift_imm bit[11:7].
1497 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1500 unsigned ARMMCCodeEmitter::
1501 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1502 SmallVectorImpl<MCFixup> &Fixups,
1503 const MCSubtargetInfo &STI) const {
1504 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1506 const MCOperand &MO = MI.getOperand(Op);
1507 uint32_t v = ~MO.getImm();
1508 uint32_t lsb = countTrailingZeros(v);
1509 uint32_t msb = (32 - countLeadingZeros (v)) - 1;
1510 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1511 return lsb | (msb << 5);
1514 unsigned ARMMCCodeEmitter::
1515 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1516 SmallVectorImpl<MCFixup> &Fixups,
1517 const MCSubtargetInfo &STI) const {
1520 // {7-0} = Number of registers
1523 // {15-0} = Bitfield of GPRs.
1524 unsigned Reg = MI.getOperand(Op).getReg();
1525 bool SPRRegs = ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg);
1526 bool DPRRegs = ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg);
1528 unsigned Binary = 0;
1530 if (SPRRegs || DPRRegs) {
1532 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
1533 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1534 Binary |= (RegNo & 0x1f) << 8;
1538 Binary |= NumRegs * 2;
1540 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1541 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(MI.getOperand(I).getReg());
1542 Binary |= 1 << RegNo;
1549 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1550 /// with the alignment operand.
1551 unsigned ARMMCCodeEmitter::
1552 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1553 SmallVectorImpl<MCFixup> &Fixups,
1554 const MCSubtargetInfo &STI) const {
1555 const MCOperand &Reg = MI.getOperand(Op);
1556 const MCOperand &Imm = MI.getOperand(Op + 1);
1558 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1561 switch (Imm.getImm()) {
1565 case 8: Align = 0x01; break;
1566 case 16: Align = 0x02; break;
1567 case 32: Align = 0x03; break;
1570 return RegNo | (Align << 4);
1573 /// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number
1574 /// along with the alignment operand for use in VST1 and VLD1 with size 32.
1575 unsigned ARMMCCodeEmitter::
1576 getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
1577 SmallVectorImpl<MCFixup> &Fixups,
1578 const MCSubtargetInfo &STI) const {
1579 const MCOperand &Reg = MI.getOperand(Op);
1580 const MCOperand &Imm = MI.getOperand(Op + 1);
1582 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1585 switch (Imm.getImm()) {
1589 case 32: // Default '0' value for invalid alignments of 8, 16, 32 bytes.
1590 case 2: Align = 0x00; break;
1591 case 4: Align = 0x03; break;
1594 return RegNo | (Align << 4);
1598 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1599 /// alignment operand for use in VLD-dup instructions. This is the same as
1600 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1601 /// different for VLD4-dup.
1602 unsigned ARMMCCodeEmitter::
1603 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1604 SmallVectorImpl<MCFixup> &Fixups,
1605 const MCSubtargetInfo &STI) const {
1606 const MCOperand &Reg = MI.getOperand(Op);
1607 const MCOperand &Imm = MI.getOperand(Op + 1);
1609 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1612 switch (Imm.getImm()) {
1616 case 8: Align = 0x01; break;
1617 case 16: Align = 0x03; break;
1620 return RegNo | (Align << 4);
1623 unsigned ARMMCCodeEmitter::
1624 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1625 SmallVectorImpl<MCFixup> &Fixups,
1626 const MCSubtargetInfo &STI) const {
1627 const MCOperand &MO = MI.getOperand(Op);
1628 if (MO.getReg() == 0) return 0x0D;
1629 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1632 unsigned ARMMCCodeEmitter::
1633 getShiftRight8Imm(const MCInst &MI, unsigned Op,
1634 SmallVectorImpl<MCFixup> &Fixups,
1635 const MCSubtargetInfo &STI) const {
1636 return 8 - MI.getOperand(Op).getImm();
1639 unsigned ARMMCCodeEmitter::
1640 getShiftRight16Imm(const MCInst &MI, unsigned Op,
1641 SmallVectorImpl<MCFixup> &Fixups,
1642 const MCSubtargetInfo &STI) const {
1643 return 16 - MI.getOperand(Op).getImm();
1646 unsigned ARMMCCodeEmitter::
1647 getShiftRight32Imm(const MCInst &MI, unsigned Op,
1648 SmallVectorImpl<MCFixup> &Fixups,
1649 const MCSubtargetInfo &STI) const {
1650 return 32 - MI.getOperand(Op).getImm();
1653 unsigned ARMMCCodeEmitter::
1654 getShiftRight64Imm(const MCInst &MI, unsigned Op,
1655 SmallVectorImpl<MCFixup> &Fixups,
1656 const MCSubtargetInfo &STI) const {
1657 return 64 - MI.getOperand(Op).getImm();
1660 void ARMMCCodeEmitter::
1661 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1662 SmallVectorImpl<MCFixup> &Fixups,
1663 const MCSubtargetInfo &STI) const {
1664 // Pseudo instructions don't get encoded.
1665 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
1666 uint64_t TSFlags = Desc.TSFlags;
1667 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1671 if (Desc.getSize() == 2 || Desc.getSize() == 4)
1672 Size = Desc.getSize();
1674 llvm_unreachable("Unexpected instruction size!");
1676 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups, STI);
1677 // Thumb 32-bit wide instructions need to emit the high order halfword
1679 if (isThumb(STI) && Size == 4) {
1680 EmitConstant(Binary >> 16, 2, OS);
1681 EmitConstant(Binary & 0xffff, 2, OS);
1683 EmitConstant(Binary, Size, OS);
1684 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1687 #include "ARMGenMCCodeEmitter.inc"