1 //===- ARMDisassembler.cpp - Disassembler for ARM/Thumb ISA ---------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "ARMBaseInstrInfo.h"
10 #include "MCTargetDesc/ARMAddressingModes.h"
11 #include "MCTargetDesc/ARMBaseInfo.h"
12 #include "MCTargetDesc/ARMMCTargetDesc.h"
13 #include "TargetInfo/ARMTargetInfo.h"
14 #include "Utils/ARMBaseInfo.h"
15 #include "llvm/MC/MCContext.h"
16 #include "llvm/MC/MCDecoderOps.h"
17 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
18 #include "llvm/MC/MCInst.h"
19 #include "llvm/MC/MCInstrDesc.h"
20 #include "llvm/MC/MCInstrInfo.h"
21 #include "llvm/MC/MCSubtargetInfo.h"
22 #include "llvm/MC/TargetRegistry.h"
23 #include "llvm/Support/Compiler.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/MathExtras.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include "llvm/TargetParser/SubtargetFeature.h"
28 #include <algorithm>
29 #include <cassert>
30 #include <cstdint>
31 #include <vector>
32
33 using namespace llvm;
34
35 #define DEBUG_TYPE "arm-disassembler"
36
37 using DecodeStatus = MCDisassembler::DecodeStatus;
38
39 namespace {
40
41 // Handles the condition code status of instructions in IT blocks
42 class ITStatus
43 {
44 public:
45 // Returns the condition code for instruction in IT block
getITCC()46 unsigned getITCC() {
47 unsigned CC = ARMCC::AL;
48 if (instrInITBlock())
49 CC = ITStates.back();
50 return CC;
51 }
52
53 // Advances the IT block state to the next T or E
advanceITState()54 void advanceITState() {
55 ITStates.pop_back();
56 }
57
58 // Returns true if the current instruction is in an IT block
instrInITBlock()59 bool instrInITBlock() {
60 return !ITStates.empty();
61 }
62
63 // Returns true if current instruction is the last instruction in an IT block
instrLastInITBlock()64 bool instrLastInITBlock() {
65 return ITStates.size() == 1;
66 }
67
68 // Called when decoding an IT instruction. Sets the IT state for
69 // the following instructions that for the IT block. Firstcond
70 // corresponds to the field in the IT instruction encoding; Mask
71 // is in the MCOperand format in which 1 means 'else' and 0 'then'.
setITState(char Firstcond,char Mask)72 void setITState(char Firstcond, char Mask) {
73 // (3 - the number of trailing zeros) is the number of then / else.
74 unsigned NumTZ = llvm::countr_zero<uint8_t>(Mask);
75 unsigned char CCBits = static_cast<unsigned char>(Firstcond & 0xf);
76 assert(NumTZ <= 3 && "Invalid IT mask!");
77 // push condition codes onto the stack the correct order for the pops
78 for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) {
79 unsigned Else = (Mask >> Pos) & 1;
80 ITStates.push_back(CCBits ^ Else);
81 }
82 ITStates.push_back(CCBits);
83 }
84
85 private:
86 std::vector<unsigned char> ITStates;
87 };
88
89 class VPTStatus
90 {
91 public:
getVPTPred()92 unsigned getVPTPred() {
93 unsigned Pred = ARMVCC::None;
94 if (instrInVPTBlock())
95 Pred = VPTStates.back();
96 return Pred;
97 }
98
advanceVPTState()99 void advanceVPTState() {
100 VPTStates.pop_back();
101 }
102
instrInVPTBlock()103 bool instrInVPTBlock() {
104 return !VPTStates.empty();
105 }
106
instrLastInVPTBlock()107 bool instrLastInVPTBlock() {
108 return VPTStates.size() == 1;
109 }
110
setVPTState(char Mask)111 void setVPTState(char Mask) {
112 // (3 - the number of trailing zeros) is the number of then / else.
113 unsigned NumTZ = llvm::countr_zero<uint8_t>(Mask);
114 assert(NumTZ <= 3 && "Invalid VPT mask!");
115 // push predicates onto the stack the correct order for the pops
116 for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) {
117 bool T = ((Mask >> Pos) & 1) == 0;
118 if (T)
119 VPTStates.push_back(ARMVCC::Then);
120 else
121 VPTStates.push_back(ARMVCC::Else);
122 }
123 VPTStates.push_back(ARMVCC::Then);
124 }
125
126 private:
127 SmallVector<unsigned char, 4> VPTStates;
128 };
129
130 /// ARM disassembler for all ARM platforms.
131 class ARMDisassembler : public MCDisassembler {
132 public:
133 std::unique_ptr<const MCInstrInfo> MCII;
134
ARMDisassembler(const MCSubtargetInfo & STI,MCContext & Ctx,const MCInstrInfo * MCII)135 ARMDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx,
136 const MCInstrInfo *MCII)
137 : MCDisassembler(STI, Ctx), MCII(MCII) {
138 InstructionEndianness = STI.hasFeature(ARM::ModeBigEndianInstructions)
139 ? llvm::endianness::big
140 : llvm::endianness::little;
141 }
142
143 ~ARMDisassembler() override = default;
144
145 DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
146 ArrayRef<uint8_t> Bytes, uint64_t Address,
147 raw_ostream &CStream) const override;
148
149 uint64_t suggestBytesToSkip(ArrayRef<uint8_t> Bytes,
150 uint64_t Address) const override;
151
152 private:
153 DecodeStatus getARMInstruction(MCInst &Instr, uint64_t &Size,
154 ArrayRef<uint8_t> Bytes, uint64_t Address,
155 raw_ostream &CStream) const;
156
157 DecodeStatus getThumbInstruction(MCInst &Instr, uint64_t &Size,
158 ArrayRef<uint8_t> Bytes, uint64_t Address,
159 raw_ostream &CStream) const;
160
161 mutable ITStatus ITBlock;
162 mutable VPTStatus VPTBlock;
163
164 void AddThumb1SBit(MCInst &MI, bool InITBlock) const;
165 bool isVectorPredicable(const MCInst &MI) const;
166 DecodeStatus AddThumbPredicate(MCInst&) const;
167 void UpdateThumbVFPPredicate(DecodeStatus &, MCInst&) const;
168
169 llvm::endianness InstructionEndianness;
170 };
171
172 } // end anonymous namespace
173
174 // Forward declare these because the autogenerated code will reference them.
175 // Definitions are further down.
176 static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
177 uint64_t Address,
178 const MCDisassembler *Decoder);
179 static DecodeStatus DecodeCLRMGPRRegisterClass(MCInst &Inst, unsigned RegNo,
180 uint64_t Address,
181 const MCDisassembler *Decoder);
182 static DecodeStatus DecodetGPROddRegisterClass(MCInst &Inst, unsigned RegNo,
183 uint64_t Address,
184 const MCDisassembler *Decoder);
185 static DecodeStatus DecodetGPREvenRegisterClass(MCInst &Inst, unsigned RegNo,
186 uint64_t Address,
187 const MCDisassembler *Decoder);
188 static DecodeStatus
189 DecodeGPRwithAPSR_NZCVnospRegisterClass(MCInst &Inst, unsigned RegNo,
190 uint64_t Address,
191 const MCDisassembler *Decoder);
192 static DecodeStatus DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo,
193 uint64_t Address,
194 const MCDisassembler *Decoder);
195 static DecodeStatus DecodeGPRnospRegisterClass(MCInst &Inst, unsigned RegNo,
196 uint64_t Address,
197 const MCDisassembler *Decoder);
198 static DecodeStatus
199 DecodeGPRwithAPSRRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
200 const MCDisassembler *Decoder);
201 static DecodeStatus DecodeGPRwithZRRegisterClass(MCInst &Inst, unsigned RegNo,
202 uint64_t Address,
203 const MCDisassembler *Decoder);
204 static DecodeStatus
205 DecodeGPRwithZRnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
206 const MCDisassembler *Decoder);
207 static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
208 uint64_t Address,
209 const MCDisassembler *Decoder);
210 static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
211 uint64_t Address,
212 const MCDisassembler *Decoder);
213 static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
214 uint64_t Address,
215 const MCDisassembler *Decoder);
216 static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
217 uint64_t Address,
218 const MCDisassembler *Decoder);
219 static DecodeStatus
220 DecodeGPRPairnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
221 const MCDisassembler *Decoder);
222 static DecodeStatus DecodeGPRspRegisterClass(MCInst &Inst, unsigned RegNo,
223 uint64_t Address,
224 const MCDisassembler *Decoder);
225 static DecodeStatus DecodeHPRRegisterClass(MCInst &Inst, unsigned RegNo,
226 uint64_t Address,
227 const MCDisassembler *Decoder);
228 static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
229 uint64_t Address,
230 const MCDisassembler *Decoder);
231 static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
232 uint64_t Address,
233 const MCDisassembler *Decoder);
234 static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
235 uint64_t Address,
236 const MCDisassembler *Decoder);
237 static DecodeStatus DecodeSPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
238 uint64_t Address,
239 const MCDisassembler *Decoder);
240 static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo,
241 uint64_t Address,
242 const MCDisassembler *Decoder);
243 static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
244 uint64_t Address,
245 const MCDisassembler *Decoder);
246 static DecodeStatus DecodeMQPRRegisterClass(MCInst &Inst, unsigned RegNo,
247 uint64_t Address,
248 const MCDisassembler *Decoder);
249 static DecodeStatus DecodeMQQPRRegisterClass(MCInst &Inst, unsigned RegNo,
250 uint64_t Address,
251 const MCDisassembler *Decoder);
252 static DecodeStatus DecodeMQQQQPRRegisterClass(MCInst &Inst, unsigned RegNo,
253 uint64_t Address,
254 const MCDisassembler *Decoder);
255 static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
256 uint64_t Address,
257 const MCDisassembler *Decoder);
258 static DecodeStatus
259 DecodeDPairSpacedRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
260 const MCDisassembler *Decoder);
261
262 static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
263 uint64_t Address,
264 const MCDisassembler *Decoder);
265 static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
266 uint64_t Address,
267 const MCDisassembler *Decoder);
268 static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
269 uint64_t Address,
270 const MCDisassembler *Decoder);
271 static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
272 uint64_t Address,
273 const MCDisassembler *Decoder);
274 static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
275 uint64_t Address,
276 const MCDisassembler *Decoder);
277
278 static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Insn,
279 uint64_t Address,
280 const MCDisassembler *Decoder);
281 static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
282 uint64_t Address,
283 const MCDisassembler *Decoder);
284 static DecodeStatus
285 DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
286 const MCDisassembler *Decoder);
287 static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Insn,
288 uint64_t Address,
289 const MCDisassembler *Decoder);
290 static DecodeStatus DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn,
291 uint64_t Address,
292 const MCDisassembler *Decoder);
293 static DecodeStatus DecodeTSBInstruction(MCInst &Inst, unsigned Insn,
294 uint64_t Address,
295 const MCDisassembler *Decoder);
296 static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Insn,
297 uint64_t Address,
298 const MCDisassembler *Decoder);
299 static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Insn,
300 uint64_t Address,
301 const MCDisassembler *Decoder);
302
303 static DecodeStatus
304 DecodeMemMultipleWritebackInstruction(MCInst &Inst, unsigned Insn,
305 uint64_t Adddress,
306 const MCDisassembler *Decoder);
307 static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
308 uint64_t Address,
309 const MCDisassembler *Decoder);
310 static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
311 uint64_t Address,
312 const MCDisassembler *Decoder);
313 static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
314 uint64_t Address,
315 const MCDisassembler *Decoder);
316 static DecodeStatus DecodeHINTInstruction(MCInst &Inst, unsigned Insn,
317 uint64_t Address,
318 const MCDisassembler *Decoder);
319 static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
320 uint64_t Address,
321 const MCDisassembler *Decoder);
322 static DecodeStatus DecodeTSTInstruction(MCInst &Inst, unsigned Insn,
323 uint64_t Address,
324 const MCDisassembler *Decoder);
325 static DecodeStatus DecodeSETPANInstruction(MCInst &Inst, unsigned Insn,
326 uint64_t Address,
327 const MCDisassembler *Decoder);
328 static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
329 uint64_t Address,
330 const MCDisassembler *Decoder);
331 static DecodeStatus DecodeT2HintSpaceInstruction(MCInst &Inst, unsigned Insn,
332 uint64_t Address,
333 const MCDisassembler *Decoder);
334 static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
335 uint64_t Address,
336 const MCDisassembler *Decoder);
337 static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
338 uint64_t Address,
339 const MCDisassembler *Decoder);
340 static DecodeStatus DecodeAddrMode5FP16Operand(MCInst &Inst, unsigned Val,
341 uint64_t Address,
342 const MCDisassembler *Decoder);
343 static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
344 uint64_t Address,
345 const MCDisassembler *Decoder);
346 static DecodeStatus DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
347 uint64_t Address,
348 const MCDisassembler *Decoder);
349 static DecodeStatus DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn,
350 uint64_t Address,
351 const MCDisassembler *Decoder);
352 static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
353 uint64_t Address,
354 const MCDisassembler *Decoder);
355 static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Val,
356 uint64_t Address,
357 const MCDisassembler *Decoder);
358 static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Val,
359 uint64_t Address,
360 const MCDisassembler *Decoder);
361 static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Val,
362 uint64_t Address,
363 const MCDisassembler *Decoder);
364 static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Val,
365 uint64_t Address,
366 const MCDisassembler *Decoder);
367 static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Val,
368 uint64_t Address,
369 const MCDisassembler *Decoder);
370 static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Val,
371 uint64_t Address,
372 const MCDisassembler *Decoder);
373 static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Val,
374 uint64_t Address,
375 const MCDisassembler *Decoder);
376 static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Val,
377 uint64_t Address,
378 const MCDisassembler *Decoder);
379 static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Val,
380 uint64_t Address,
381 const MCDisassembler *Decoder);
382 static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Val,
383 uint64_t Address,
384 const MCDisassembler *Decoder);
385 static DecodeStatus DecodeVMOVModImmInstruction(MCInst &Inst, unsigned Val,
386 uint64_t Address,
387 const MCDisassembler *Decoder);
388 static DecodeStatus DecodeMVEModImmInstruction(MCInst &Inst, unsigned Val,
389 uint64_t Address,
390 const MCDisassembler *Decoder);
391 static DecodeStatus DecodeMVEVADCInstruction(MCInst &Inst, unsigned Insn,
392 uint64_t Address,
393 const MCDisassembler *Decoder);
394 static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Val,
395 uint64_t Address,
396 const MCDisassembler *Decoder);
397 static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
398 uint64_t Address,
399 const MCDisassembler *Decoder);
400 static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
401 uint64_t Address,
402 const MCDisassembler *Decoder);
403 static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
404 uint64_t Address,
405 const MCDisassembler *Decoder);
406 static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
407 uint64_t Address,
408 const MCDisassembler *Decoder);
409 static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
410 uint64_t Address,
411 const MCDisassembler *Decoder);
412 static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn,
413 uint64_t Address,
414 const MCDisassembler *Decoder);
415 static DecodeStatus DecodeMveAddrModeRQ(MCInst &Inst, unsigned Insn,
416 uint64_t Address,
417 const MCDisassembler *Decoder);
418 template <int shift>
419 static DecodeStatus DecodeMveAddrModeQ(MCInst &Inst, unsigned Insn,
420 uint64_t Address,
421 const MCDisassembler *Decoder);
422 static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Insn,
423 uint64_t Address,
424 const MCDisassembler *Decoder);
425 static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Insn,
426 uint64_t Address,
427 const MCDisassembler *Decoder);
428 static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Insn,
429 uint64_t Address,
430 const MCDisassembler *Decoder);
431 static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Insn, uint64_t Address,
432 const MCDisassembler *Decoder);
433 static DecodeStatus DecodeBankedReg(MCInst &Inst, unsigned Insn,
434 uint64_t Address,
435 const MCDisassembler *Decoder);
436 static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn,
437 uint64_t Address,
438 const MCDisassembler *Decoder);
439 static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn,
440 uint64_t Address,
441 const MCDisassembler *Decoder);
442 static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn,
443 uint64_t Address,
444 const MCDisassembler *Decoder);
445 static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn,
446 uint64_t Address,
447 const MCDisassembler *Decoder);
448 static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn,
449 uint64_t Address,
450 const MCDisassembler *Decoder);
451 static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn,
452 uint64_t Address,
453 const MCDisassembler *Decoder);
454 static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn, uint64_t Address,
455 const MCDisassembler *Decoder);
456 static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn, uint64_t Address,
457 const MCDisassembler *Decoder);
458 static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn, uint64_t Address,
459 const MCDisassembler *Decoder);
460 static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn, uint64_t Address,
461 const MCDisassembler *Decoder);
462 static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn, uint64_t Address,
463 const MCDisassembler *Decoder);
464 static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn, uint64_t Address,
465 const MCDisassembler *Decoder);
466 static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn, uint64_t Address,
467 const MCDisassembler *Decoder);
468 static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn, uint64_t Address,
469 const MCDisassembler *Decoder);
470 static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn, uint64_t Address,
471 const MCDisassembler *Decoder);
472 static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn, uint64_t Address,
473 const MCDisassembler *Decoder);
474 static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn, uint64_t Address,
475 const MCDisassembler *Decoder);
476 static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn, uint64_t Address,
477 const MCDisassembler *Decoder);
478 static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn, uint64_t Address,
479 const MCDisassembler *Decoder);
480 static DecodeStatus DecodeVCVTImmOperand(MCInst &Inst, unsigned Insn,
481 uint64_t Address,
482 const MCDisassembler *Decoder);
483 static DecodeStatus
484 DecodeNEONComplexLane64Instruction(MCInst &Inst, unsigned Val, uint64_t Address,
485 const MCDisassembler *Decoder);
486
487 static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
488 uint64_t Address,
489 const MCDisassembler *Decoder);
490 static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
491 uint64_t Address,
492 const MCDisassembler *Decoder);
493 static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
494 uint64_t Address,
495 const MCDisassembler *Decoder);
496 static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
497 uint64_t Address,
498 const MCDisassembler *Decoder);
499 static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
500 uint64_t Address,
501 const MCDisassembler *Decoder);
502 static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
503 uint64_t Address,
504 const MCDisassembler *Decoder);
505 static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
506 uint64_t Address,
507 const MCDisassembler *Decoder);
508 static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
509 uint64_t Address,
510 const MCDisassembler *Decoder);
511 static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
512 uint64_t Address,
513 const MCDisassembler *Decoder);
514 static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Val,
515 uint64_t Address,
516 const MCDisassembler *Decoder);
517 static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
518 uint64_t Address,
519 const MCDisassembler *Decoder);
520 static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
521 uint64_t Address,
522 const MCDisassembler *Decoder);
523 static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn, uint64_t Address,
524 const MCDisassembler *Decoder);
525 static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
526 uint64_t Address,
527 const MCDisassembler *Decoder);
528 static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val, uint64_t Address,
529 const MCDisassembler *Decoder);
530 static DecodeStatus DecodeT2Imm7S4(MCInst &Inst, unsigned Val, uint64_t Address,
531 const MCDisassembler *Decoder);
532 static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
533 uint64_t Address,
534 const MCDisassembler *Decoder);
535 static DecodeStatus DecodeT2AddrModeImm7s4(MCInst &Inst, unsigned Val,
536 uint64_t Address,
537 const MCDisassembler *Decoder);
538 static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst, unsigned Val,
539 uint64_t Address,
540 const MCDisassembler *Decoder);
541 static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val, uint64_t Address,
542 const MCDisassembler *Decoder);
543 template <int shift>
544 static DecodeStatus DecodeT2Imm7(MCInst &Inst, unsigned Val, uint64_t Address,
545 const MCDisassembler *Decoder);
546 static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
547 uint64_t Address,
548 const MCDisassembler *Decoder);
549 template <int shift>
550 static DecodeStatus DecodeTAddrModeImm7(MCInst &Inst, unsigned Val,
551 uint64_t Address,
552 const MCDisassembler *Decoder);
553 template <int shift, int WriteBack>
554 static DecodeStatus DecodeT2AddrModeImm7(MCInst &Inst, unsigned Val,
555 uint64_t Address,
556 const MCDisassembler *Decoder);
557 static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Val,
558 uint64_t Address,
559 const MCDisassembler *Decoder);
560 static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
561 uint64_t Address,
562 const MCDisassembler *Decoder);
563 static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn,
564 uint64_t Address,
565 const MCDisassembler *Decoder);
566 static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
567 uint64_t Address,
568 const MCDisassembler *Decoder);
569 static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Insn,
570 uint64_t Address,
571 const MCDisassembler *Decoder);
572 static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
573 uint64_t Address,
574 const MCDisassembler *Decoder);
575 static DecodeStatus DecodeThumbTableBranch(MCInst &Inst, unsigned Val,
576 uint64_t Address,
577 const MCDisassembler *Decoder);
578 static DecodeStatus DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Val,
579 uint64_t Address,
580 const MCDisassembler *Decoder);
581 static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val, uint64_t Address,
582 const MCDisassembler *Decoder);
583 static DecodeStatus DecodeThumbBCCTargetOperand(MCInst &Inst, unsigned Val,
584 uint64_t Address,
585 const MCDisassembler *Decoder);
586 static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val,
587 uint64_t Address,
588 const MCDisassembler *Decoder);
589 static DecodeStatus DecodeIT(MCInst &Inst, unsigned Val, uint64_t Address,
590 const MCDisassembler *Decoder);
591 static DecodeStatus DecodeT2LDRDPreInstruction(MCInst &Inst, unsigned Insn,
592 uint64_t Address,
593 const MCDisassembler *Decoder);
594 static DecodeStatus DecodeT2STRDPreInstruction(MCInst &Inst, unsigned Insn,
595 uint64_t Address,
596 const MCDisassembler *Decoder);
597 static DecodeStatus DecodeT2Adr(MCInst &Inst, unsigned Val, uint64_t Address,
598 const MCDisassembler *Decoder);
599 static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Val,
600 uint64_t Address,
601 const MCDisassembler *Decoder);
602 static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, unsigned Val,
603 uint64_t Address,
604 const MCDisassembler *Decoder);
605
606 static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val, uint64_t Address,
607 const MCDisassembler *Decoder);
608 static DecodeStatus DecoderForMRRC2AndMCRR2(MCInst &Inst, unsigned Val,
609 uint64_t Address,
610 const MCDisassembler *Decoder);
611 static DecodeStatus DecodeForVMRSandVMSR(MCInst &Inst, unsigned Val,
612 uint64_t Address,
613 const MCDisassembler *Decoder);
614
615 template <bool isSigned, bool isNeg, bool zeroPermitted, int size>
616 static DecodeStatus DecodeBFLabelOperand(MCInst &Inst, unsigned val,
617 uint64_t Address,
618 const MCDisassembler *Decoder);
619 static DecodeStatus DecodeBFAfterTargetOperand(MCInst &Inst, unsigned val,
620 uint64_t Address,
621 const MCDisassembler *Decoder);
622 static DecodeStatus DecodePredNoALOperand(MCInst &Inst, unsigned Val,
623 uint64_t Address,
624 const MCDisassembler *Decoder);
625 static DecodeStatus DecodeLOLoop(MCInst &Inst, unsigned Insn, uint64_t Address,
626 const MCDisassembler *Decoder);
627 static DecodeStatus DecodeLongShiftOperand(MCInst &Inst, unsigned Val,
628 uint64_t Address,
629 const MCDisassembler *Decoder);
630 static DecodeStatus DecodeVSCCLRM(MCInst &Inst, unsigned Insn, uint64_t Address,
631 const MCDisassembler *Decoder);
632 static DecodeStatus DecodeVPTMaskOperand(MCInst &Inst, unsigned Val,
633 uint64_t Address,
634 const MCDisassembler *Decoder);
635 static DecodeStatus DecodeVpredROperand(MCInst &Inst, unsigned Val,
636 uint64_t Address,
637 const MCDisassembler *Decoder);
638 static DecodeStatus DecodeVpredNOperand(MCInst &Inst, unsigned Val,
639 uint64_t Address,
640 const MCDisassembler *Decoder);
641 static DecodeStatus
642 DecodeRestrictedIPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
643 const MCDisassembler *Decoder);
644 static DecodeStatus
645 DecodeRestrictedSPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
646 const MCDisassembler *Decoder);
647 static DecodeStatus
648 DecodeRestrictedUPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
649 const MCDisassembler *Decoder);
650 static DecodeStatus
651 DecodeRestrictedFPPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
652 const MCDisassembler *Decoder);
653 template <bool Writeback>
654 static DecodeStatus DecodeVSTRVLDR_SYSREG(MCInst &Inst, unsigned Insn,
655 uint64_t Address,
656 const MCDisassembler *Decoder);
657 template <int shift>
658 static DecodeStatus DecodeMVE_MEM_1_pre(MCInst &Inst, unsigned Val,
659 uint64_t Address,
660 const MCDisassembler *Decoder);
661 template <int shift>
662 static DecodeStatus DecodeMVE_MEM_2_pre(MCInst &Inst, unsigned Val,
663 uint64_t Address,
664 const MCDisassembler *Decoder);
665 template <int shift>
666 static DecodeStatus DecodeMVE_MEM_3_pre(MCInst &Inst, unsigned Val,
667 uint64_t Address,
668 const MCDisassembler *Decoder);
669 template <unsigned MinLog, unsigned MaxLog>
670 static DecodeStatus DecodePowerTwoOperand(MCInst &Inst, unsigned Val,
671 uint64_t Address,
672 const MCDisassembler *Decoder);
673 template <unsigned start>
674 static DecodeStatus
675 DecodeMVEPairVectorIndexOperand(MCInst &Inst, unsigned Val, uint64_t Address,
676 const MCDisassembler *Decoder);
677 static DecodeStatus DecodeMVEVMOVQtoDReg(MCInst &Inst, unsigned Insn,
678 uint64_t Address,
679 const MCDisassembler *Decoder);
680 static DecodeStatus DecodeMVEVMOVDRegtoQ(MCInst &Inst, unsigned Insn,
681 uint64_t Address,
682 const MCDisassembler *Decoder);
683 static DecodeStatus DecodeMVEVCVTt1fp(MCInst &Inst, unsigned Insn,
684 uint64_t Address,
685 const MCDisassembler *Decoder);
686 typedef DecodeStatus OperandDecoder(MCInst &Inst, unsigned Val,
687 uint64_t Address,
688 const MCDisassembler *Decoder);
689 template <bool scalar, OperandDecoder predicate_decoder>
690 static DecodeStatus DecodeMVEVCMP(MCInst &Inst, unsigned Insn, uint64_t Address,
691 const MCDisassembler *Decoder);
692 static DecodeStatus DecodeMveVCTP(MCInst &Inst, unsigned Insn, uint64_t Address,
693 const MCDisassembler *Decoder);
694 static DecodeStatus DecodeMVEVPNOT(MCInst &Inst, unsigned Insn,
695 uint64_t Address,
696 const MCDisassembler *Decoder);
697 static DecodeStatus
698 DecodeMVEOverlappingLongShift(MCInst &Inst, unsigned Insn, uint64_t Address,
699 const MCDisassembler *Decoder);
700 static DecodeStatus DecodeT2AddSubSPImm(MCInst &Inst, unsigned Insn,
701 uint64_t Address,
702 const MCDisassembler *Decoder);
703
704 #include "ARMGenDisassemblerTables.inc"
705
createARMDisassembler(const Target & T,const MCSubtargetInfo & STI,MCContext & Ctx)706 static MCDisassembler *createARMDisassembler(const Target &T,
707 const MCSubtargetInfo &STI,
708 MCContext &Ctx) {
709 return new ARMDisassembler(STI, Ctx, T.createMCInstrInfo());
710 }
711
712 // Post-decoding checks
checkDecodedInstruction(MCInst & MI,uint64_t & Size,uint64_t Address,raw_ostream & CS,uint32_t Insn,DecodeStatus Result)713 static DecodeStatus checkDecodedInstruction(MCInst &MI, uint64_t &Size,
714 uint64_t Address, raw_ostream &CS,
715 uint32_t Insn,
716 DecodeStatus Result) {
717 switch (MI.getOpcode()) {
718 case ARM::HVC: {
719 // HVC is undefined if condition = 0xf otherwise upredictable
720 // if condition != 0xe
721 uint32_t Cond = (Insn >> 28) & 0xF;
722 if (Cond == 0xF)
723 return MCDisassembler::Fail;
724 if (Cond != 0xE)
725 return MCDisassembler::SoftFail;
726 return Result;
727 }
728 case ARM::t2ADDri:
729 case ARM::t2ADDri12:
730 case ARM::t2ADDrr:
731 case ARM::t2ADDrs:
732 case ARM::t2SUBri:
733 case ARM::t2SUBri12:
734 case ARM::t2SUBrr:
735 case ARM::t2SUBrs:
736 if (MI.getOperand(0).getReg() == ARM::SP &&
737 MI.getOperand(1).getReg() != ARM::SP)
738 return MCDisassembler::SoftFail;
739 return Result;
740 default: return Result;
741 }
742 }
743
suggestBytesToSkip(ArrayRef<uint8_t> Bytes,uint64_t Address) const744 uint64_t ARMDisassembler::suggestBytesToSkip(ArrayRef<uint8_t> Bytes,
745 uint64_t Address) const {
746 // In Arm state, instructions are always 4 bytes wide, so there's no
747 // point in skipping any smaller number of bytes if an instruction
748 // can't be decoded.
749 if (!STI.hasFeature(ARM::ModeThumb))
750 return 4;
751
752 // In a Thumb instruction stream, a halfword is a standalone 2-byte
753 // instruction if and only if its value is less than 0xE800.
754 // Otherwise, it's the first halfword of a 4-byte instruction.
755 //
756 // So, if we can see the upcoming halfword, we can judge on that
757 // basis, and maybe skip a whole 4-byte instruction that we don't
758 // know how to decode, without accidentally trying to interpret its
759 // second half as something else.
760 //
761 // If we don't have the instruction data available, we just have to
762 // recommend skipping the minimum sensible distance, which is 2
763 // bytes.
764 if (Bytes.size() < 2)
765 return 2;
766
767 uint16_t Insn16 = llvm::support::endian::read<uint16_t>(
768 Bytes.data(), InstructionEndianness);
769 return Insn16 < 0xE800 ? 2 : 4;
770 }
771
getInstruction(MCInst & MI,uint64_t & Size,ArrayRef<uint8_t> Bytes,uint64_t Address,raw_ostream & CS) const772 DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
773 ArrayRef<uint8_t> Bytes,
774 uint64_t Address,
775 raw_ostream &CS) const {
776 if (STI.hasFeature(ARM::ModeThumb))
777 return getThumbInstruction(MI, Size, Bytes, Address, CS);
778 return getARMInstruction(MI, Size, Bytes, Address, CS);
779 }
780
getARMInstruction(MCInst & MI,uint64_t & Size,ArrayRef<uint8_t> Bytes,uint64_t Address,raw_ostream & CS) const781 DecodeStatus ARMDisassembler::getARMInstruction(MCInst &MI, uint64_t &Size,
782 ArrayRef<uint8_t> Bytes,
783 uint64_t Address,
784 raw_ostream &CS) const {
785 CommentStream = &CS;
786
787 assert(!STI.hasFeature(ARM::ModeThumb) &&
788 "Asked to disassemble an ARM instruction but Subtarget is in Thumb "
789 "mode!");
790
791 // We want to read exactly 4 bytes of data.
792 if (Bytes.size() < 4) {
793 Size = 0;
794 return MCDisassembler::Fail;
795 }
796
797 // Encoded as a 32-bit word in the stream.
798 uint32_t Insn = llvm::support::endian::read<uint32_t>(Bytes.data(),
799 InstructionEndianness);
800
801 // Calling the auto-generated decoder function.
802 DecodeStatus Result =
803 decodeInstruction(DecoderTableARM32, MI, Insn, Address, this, STI);
804 if (Result != MCDisassembler::Fail) {
805 Size = 4;
806 return checkDecodedInstruction(MI, Size, Address, CS, Insn, Result);
807 }
808
809 struct DecodeTable {
810 const uint8_t *P;
811 bool DecodePred;
812 };
813
814 const DecodeTable Tables[] = {
815 {DecoderTableVFP32, false}, {DecoderTableVFPV832, false},
816 {DecoderTableNEONData32, true}, {DecoderTableNEONLoadStore32, true},
817 {DecoderTableNEONDup32, true}, {DecoderTablev8NEON32, false},
818 {DecoderTablev8Crypto32, false},
819 };
820
821 for (auto Table : Tables) {
822 Result = decodeInstruction(Table.P, MI, Insn, Address, this, STI);
823 if (Result != MCDisassembler::Fail) {
824 Size = 4;
825 // Add a fake predicate operand, because we share these instruction
826 // definitions with Thumb2 where these instructions are predicable.
827 if (Table.DecodePred && !DecodePredicateOperand(MI, 0xE, Address, this))
828 return MCDisassembler::Fail;
829 return Result;
830 }
831 }
832
833 Result =
834 decodeInstruction(DecoderTableCoProc32, MI, Insn, Address, this, STI);
835 if (Result != MCDisassembler::Fail) {
836 Size = 4;
837 return checkDecodedInstruction(MI, Size, Address, CS, Insn, Result);
838 }
839
840 Size = 4;
841 return MCDisassembler::Fail;
842 }
843
844 /// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the
845 /// immediate Value in the MCInst. The immediate Value has had any PC
846 /// adjustment made by the caller. If the instruction is a branch instruction
847 /// then isBranch is true, else false. If the getOpInfo() function was set as
848 /// part of the setupForSymbolicDisassembly() call then that function is called
849 /// to get any symbolic information at the Address for this instruction. If
850 /// that returns non-zero then the symbolic information it returns is used to
851 /// create an MCExpr and that is added as an operand to the MCInst. If
852 /// getOpInfo() returns zero and isBranch is true then a symbol look up for
853 /// Value is done and if a symbol is found an MCExpr is created with that, else
854 /// an MCExpr with Value is created. This function returns true if it adds an
855 /// operand to the MCInst and false otherwise.
tryAddingSymbolicOperand(uint64_t Address,int32_t Value,bool isBranch,uint64_t InstSize,MCInst & MI,const MCDisassembler * Decoder)856 static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value,
857 bool isBranch, uint64_t InstSize,
858 MCInst &MI,
859 const MCDisassembler *Decoder) {
860 // FIXME: Does it make sense for value to be negative?
861 return Decoder->tryAddingSymbolicOperand(MI, (uint32_t)Value, Address,
862 isBranch, /*Offset=*/0, /*OpSize=*/0,
863 InstSize);
864 }
865
866 /// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being
867 /// referenced by a load instruction with the base register that is the Pc.
868 /// These can often be values in a literal pool near the Address of the
869 /// instruction. The Address of the instruction and its immediate Value are
870 /// used as a possible literal pool entry. The SymbolLookUp call back will
871 /// return the name of a symbol referenced by the literal pool's entry if
872 /// the referenced address is that of a symbol. Or it will return a pointer to
873 /// a literal 'C' string if the referenced address of the literal pool's entry
874 /// is an address into a section with 'C' string literals.
tryAddingPcLoadReferenceComment(uint64_t Address,int Value,const MCDisassembler * Decoder)875 static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value,
876 const MCDisassembler *Decoder) {
877 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
878 Dis->tryAddingPcLoadReferenceComment(Value, Address);
879 }
880
881 // Thumb1 instructions don't have explicit S bits. Rather, they
882 // implicitly set CPSR. Since it's not represented in the encoding, the
883 // auto-generated decoder won't inject the CPSR operand. We need to fix
884 // that as a post-pass.
AddThumb1SBit(MCInst & MI,bool InITBlock) const885 void ARMDisassembler::AddThumb1SBit(MCInst &MI, bool InITBlock) const {
886 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
887 MCInst::iterator I = MI.begin();
888 for (unsigned i = 0; i < MCID.NumOperands; ++i, ++I) {
889 if (I == MI.end()) break;
890 if (MCID.operands()[i].isOptionalDef() &&
891 MCID.operands()[i].RegClass == ARM::CCRRegClassID) {
892 if (i > 0 && MCID.operands()[i - 1].isPredicate())
893 continue;
894 MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR));
895 return;
896 }
897 }
898
899 MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR));
900 }
901
isVectorPredicable(const MCInst & MI) const902 bool ARMDisassembler::isVectorPredicable(const MCInst &MI) const {
903 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
904 for (unsigned i = 0; i < MCID.NumOperands; ++i) {
905 if (ARM::isVpred(MCID.operands()[i].OperandType))
906 return true;
907 }
908 return false;
909 }
910
911 // Most Thumb instructions don't have explicit predicates in the
912 // encoding, but rather get their predicates from IT context. We need
913 // to fix up the predicate operands using this context information as a
914 // post-pass.
915 MCDisassembler::DecodeStatus
AddThumbPredicate(MCInst & MI) const916 ARMDisassembler::AddThumbPredicate(MCInst &MI) const {
917 MCDisassembler::DecodeStatus S = Success;
918
919 const FeatureBitset &FeatureBits = getSubtargetInfo().getFeatureBits();
920
921 // A few instructions actually have predicates encoded in them. Don't
922 // try to overwrite it if we're seeing one of those.
923 switch (MI.getOpcode()) {
924 case ARM::tBcc:
925 case ARM::t2Bcc:
926 case ARM::tCBZ:
927 case ARM::tCBNZ:
928 case ARM::tCPS:
929 case ARM::t2CPS3p:
930 case ARM::t2CPS2p:
931 case ARM::t2CPS1p:
932 case ARM::t2CSEL:
933 case ARM::t2CSINC:
934 case ARM::t2CSINV:
935 case ARM::t2CSNEG:
936 case ARM::tMOVSr:
937 case ARM::tSETEND:
938 // Some instructions (mostly conditional branches) are not
939 // allowed in IT blocks.
940 if (ITBlock.instrInITBlock())
941 S = SoftFail;
942 else
943 return Success;
944 break;
945 case ARM::t2HINT:
946 if (MI.getOperand(0).getImm() == 0x10 && (FeatureBits[ARM::FeatureRAS]) != 0)
947 S = SoftFail;
948 break;
949 case ARM::tB:
950 case ARM::t2B:
951 case ARM::t2TBB:
952 case ARM::t2TBH:
953 // Some instructions (mostly unconditional branches) can
954 // only appears at the end of, or outside of, an IT.
955 if (ITBlock.instrInITBlock() && !ITBlock.instrLastInITBlock())
956 S = SoftFail;
957 break;
958 default:
959 break;
960 }
961
962 // Warn on non-VPT predicable instruction in a VPT block and a VPT
963 // predicable instruction in an IT block
964 if ((!isVectorPredicable(MI) && VPTBlock.instrInVPTBlock()) ||
965 (isVectorPredicable(MI) && ITBlock.instrInITBlock()))
966 S = SoftFail;
967
968 // If we're in an IT/VPT block, base the predicate on that. Otherwise,
969 // assume a predicate of AL.
970 unsigned CC = ARMCC::AL;
971 unsigned VCC = ARMVCC::None;
972 if (ITBlock.instrInITBlock()) {
973 CC = ITBlock.getITCC();
974 ITBlock.advanceITState();
975 } else if (VPTBlock.instrInVPTBlock()) {
976 VCC = VPTBlock.getVPTPred();
977 VPTBlock.advanceVPTState();
978 }
979
980 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
981
982 MCInst::iterator CCI = MI.begin();
983 for (unsigned i = 0; i < MCID.NumOperands; ++i, ++CCI) {
984 if (MCID.operands()[i].isPredicate() || CCI == MI.end())
985 break;
986 }
987
988 if (MCID.isPredicable()) {
989 CCI = MI.insert(CCI, MCOperand::createImm(CC));
990 ++CCI;
991 if (CC == ARMCC::AL)
992 MI.insert(CCI, MCOperand::createReg(0));
993 else
994 MI.insert(CCI, MCOperand::createReg(ARM::CPSR));
995 } else if (CC != ARMCC::AL) {
996 Check(S, SoftFail);
997 }
998
999 MCInst::iterator VCCI = MI.begin();
1000 unsigned VCCPos;
1001 for (VCCPos = 0; VCCPos < MCID.NumOperands; ++VCCPos, ++VCCI) {
1002 if (ARM::isVpred(MCID.operands()[VCCPos].OperandType) || VCCI == MI.end())
1003 break;
1004 }
1005
1006 if (isVectorPredicable(MI)) {
1007 VCCI = MI.insert(VCCI, MCOperand::createImm(VCC));
1008 ++VCCI;
1009 if (VCC == ARMVCC::None)
1010 VCCI = MI.insert(VCCI, MCOperand::createReg(0));
1011 else
1012 VCCI = MI.insert(VCCI, MCOperand::createReg(ARM::P0));
1013 ++VCCI;
1014 VCCI = MI.insert(VCCI, MCOperand::createReg(0));
1015 ++VCCI;
1016 if (MCID.operands()[VCCPos].OperandType == ARM::OPERAND_VPRED_R) {
1017 int TiedOp = MCID.getOperandConstraint(VCCPos + 3, MCOI::TIED_TO);
1018 assert(TiedOp >= 0 &&
1019 "Inactive register in vpred_r is not tied to an output!");
1020 // Copy the operand to ensure it's not invalidated when MI grows.
1021 MI.insert(VCCI, MCOperand(MI.getOperand(TiedOp)));
1022 }
1023 } else if (VCC != ARMVCC::None) {
1024 Check(S, SoftFail);
1025 }
1026
1027 return S;
1028 }
1029
1030 // Thumb VFP instructions are a special case. Because we share their
1031 // encodings between ARM and Thumb modes, and they are predicable in ARM
1032 // mode, the auto-generated decoder will give them an (incorrect)
1033 // predicate operand. We need to rewrite these operands based on the IT
1034 // context as a post-pass.
UpdateThumbVFPPredicate(DecodeStatus & S,MCInst & MI) const1035 void ARMDisassembler::UpdateThumbVFPPredicate(
1036 DecodeStatus &S, MCInst &MI) const {
1037 unsigned CC;
1038 CC = ITBlock.getITCC();
1039 if (CC == 0xF)
1040 CC = ARMCC::AL;
1041 if (ITBlock.instrInITBlock())
1042 ITBlock.advanceITState();
1043 else if (VPTBlock.instrInVPTBlock()) {
1044 CC = VPTBlock.getVPTPred();
1045 VPTBlock.advanceVPTState();
1046 }
1047
1048 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
1049 ArrayRef<MCOperandInfo> OpInfo = MCID.operands();
1050 MCInst::iterator I = MI.begin();
1051 unsigned short NumOps = MCID.NumOperands;
1052 for (unsigned i = 0; i < NumOps; ++i, ++I) {
1053 if (OpInfo[i].isPredicate() ) {
1054 if (CC != ARMCC::AL && !MCID.isPredicable())
1055 Check(S, SoftFail);
1056 I->setImm(CC);
1057 ++I;
1058 if (CC == ARMCC::AL)
1059 I->setReg(0);
1060 else
1061 I->setReg(ARM::CPSR);
1062 return;
1063 }
1064 }
1065 }
1066
getThumbInstruction(MCInst & MI,uint64_t & Size,ArrayRef<uint8_t> Bytes,uint64_t Address,raw_ostream & CS) const1067 DecodeStatus ARMDisassembler::getThumbInstruction(MCInst &MI, uint64_t &Size,
1068 ArrayRef<uint8_t> Bytes,
1069 uint64_t Address,
1070 raw_ostream &CS) const {
1071 CommentStream = &CS;
1072
1073 assert(STI.hasFeature(ARM::ModeThumb) &&
1074 "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!");
1075
1076 // We want to read exactly 2 bytes of data.
1077 if (Bytes.size() < 2) {
1078 Size = 0;
1079 return MCDisassembler::Fail;
1080 }
1081
1082 uint16_t Insn16 = llvm::support::endian::read<uint16_t>(
1083 Bytes.data(), InstructionEndianness);
1084 DecodeStatus Result =
1085 decodeInstruction(DecoderTableThumb16, MI, Insn16, Address, this, STI);
1086 if (Result != MCDisassembler::Fail) {
1087 Size = 2;
1088 Check(Result, AddThumbPredicate(MI));
1089 return Result;
1090 }
1091
1092 Result = decodeInstruction(DecoderTableThumbSBit16, MI, Insn16, Address, this,
1093 STI);
1094 if (Result) {
1095 Size = 2;
1096 bool InITBlock = ITBlock.instrInITBlock();
1097 Check(Result, AddThumbPredicate(MI));
1098 AddThumb1SBit(MI, InITBlock);
1099 return Result;
1100 }
1101
1102 Result =
1103 decodeInstruction(DecoderTableThumb216, MI, Insn16, Address, this, STI);
1104 if (Result != MCDisassembler::Fail) {
1105 Size = 2;
1106
1107 // Nested IT blocks are UNPREDICTABLE. Must be checked before we add
1108 // the Thumb predicate.
1109 if (MI.getOpcode() == ARM::t2IT && ITBlock.instrInITBlock())
1110 Result = MCDisassembler::SoftFail;
1111
1112 Check(Result, AddThumbPredicate(MI));
1113
1114 // If we find an IT instruction, we need to parse its condition
1115 // code and mask operands so that we can apply them correctly
1116 // to the subsequent instructions.
1117 if (MI.getOpcode() == ARM::t2IT) {
1118 unsigned Firstcond = MI.getOperand(0).getImm();
1119 unsigned Mask = MI.getOperand(1).getImm();
1120 ITBlock.setITState(Firstcond, Mask);
1121
1122 // An IT instruction that would give a 'NV' predicate is unpredictable.
1123 if (Firstcond == ARMCC::AL && !isPowerOf2_32(Mask))
1124 CS << "unpredictable IT predicate sequence";
1125 }
1126
1127 return Result;
1128 }
1129
1130 // We want to read exactly 4 bytes of data.
1131 if (Bytes.size() < 4) {
1132 Size = 0;
1133 return MCDisassembler::Fail;
1134 }
1135
1136 uint32_t Insn32 =
1137 (uint32_t(Insn16) << 16) | llvm::support::endian::read<uint16_t>(
1138 Bytes.data() + 2, InstructionEndianness);
1139
1140 Result =
1141 decodeInstruction(DecoderTableMVE32, MI, Insn32, Address, this, STI);
1142 if (Result != MCDisassembler::Fail) {
1143 Size = 4;
1144
1145 // Nested VPT blocks are UNPREDICTABLE. Must be checked before we add
1146 // the VPT predicate.
1147 if (isVPTOpcode(MI.getOpcode()) && VPTBlock.instrInVPTBlock())
1148 Result = MCDisassembler::SoftFail;
1149
1150 Check(Result, AddThumbPredicate(MI));
1151
1152 if (isVPTOpcode(MI.getOpcode())) {
1153 unsigned Mask = MI.getOperand(0).getImm();
1154 VPTBlock.setVPTState(Mask);
1155 }
1156
1157 return Result;
1158 }
1159
1160 Result =
1161 decodeInstruction(DecoderTableThumb32, MI, Insn32, Address, this, STI);
1162 if (Result != MCDisassembler::Fail) {
1163 Size = 4;
1164 bool InITBlock = ITBlock.instrInITBlock();
1165 Check(Result, AddThumbPredicate(MI));
1166 AddThumb1SBit(MI, InITBlock);
1167 return Result;
1168 }
1169
1170 Result =
1171 decodeInstruction(DecoderTableThumb232, MI, Insn32, Address, this, STI);
1172 if (Result != MCDisassembler::Fail) {
1173 Size = 4;
1174 Check(Result, AddThumbPredicate(MI));
1175 return checkDecodedInstruction(MI, Size, Address, CS, Insn32, Result);
1176 }
1177
1178 if (fieldFromInstruction(Insn32, 28, 4) == 0xE) {
1179 Result =
1180 decodeInstruction(DecoderTableVFP32, MI, Insn32, Address, this, STI);
1181 if (Result != MCDisassembler::Fail) {
1182 Size = 4;
1183 UpdateThumbVFPPredicate(Result, MI);
1184 return Result;
1185 }
1186 }
1187
1188 Result =
1189 decodeInstruction(DecoderTableVFPV832, MI, Insn32, Address, this, STI);
1190 if (Result != MCDisassembler::Fail) {
1191 Size = 4;
1192 return Result;
1193 }
1194
1195 if (fieldFromInstruction(Insn32, 28, 4) == 0xE) {
1196 Result = decodeInstruction(DecoderTableNEONDup32, MI, Insn32, Address, this,
1197 STI);
1198 if (Result != MCDisassembler::Fail) {
1199 Size = 4;
1200 Check(Result, AddThumbPredicate(MI));
1201 return Result;
1202 }
1203 }
1204
1205 if (fieldFromInstruction(Insn32, 24, 8) == 0xF9) {
1206 uint32_t NEONLdStInsn = Insn32;
1207 NEONLdStInsn &= 0xF0FFFFFF;
1208 NEONLdStInsn |= 0x04000000;
1209 Result = decodeInstruction(DecoderTableNEONLoadStore32, MI, NEONLdStInsn,
1210 Address, this, STI);
1211 if (Result != MCDisassembler::Fail) {
1212 Size = 4;
1213 Check(Result, AddThumbPredicate(MI));
1214 return Result;
1215 }
1216 }
1217
1218 if (fieldFromInstruction(Insn32, 24, 4) == 0xF) {
1219 uint32_t NEONDataInsn = Insn32;
1220 NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24
1221 NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
1222 NEONDataInsn |= 0x12000000; // Set bits 28 and 25
1223 Result = decodeInstruction(DecoderTableNEONData32, MI, NEONDataInsn,
1224 Address, this, STI);
1225 if (Result != MCDisassembler::Fail) {
1226 Size = 4;
1227 Check(Result, AddThumbPredicate(MI));
1228 return Result;
1229 }
1230
1231 uint32_t NEONCryptoInsn = Insn32;
1232 NEONCryptoInsn &= 0xF0FFFFFF; // Clear bits 27-24
1233 NEONCryptoInsn |= (NEONCryptoInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
1234 NEONCryptoInsn |= 0x12000000; // Set bits 28 and 25
1235 Result = decodeInstruction(DecoderTablev8Crypto32, MI, NEONCryptoInsn,
1236 Address, this, STI);
1237 if (Result != MCDisassembler::Fail) {
1238 Size = 4;
1239 return Result;
1240 }
1241
1242 uint32_t NEONv8Insn = Insn32;
1243 NEONv8Insn &= 0xF3FFFFFF; // Clear bits 27-26
1244 Result = decodeInstruction(DecoderTablev8NEON32, MI, NEONv8Insn, Address,
1245 this, STI);
1246 if (Result != MCDisassembler::Fail) {
1247 Size = 4;
1248 return Result;
1249 }
1250 }
1251
1252 uint32_t Coproc = fieldFromInstruction(Insn32, 8, 4);
1253 const uint8_t *DecoderTable = ARM::isCDECoproc(Coproc, STI)
1254 ? DecoderTableThumb2CDE32
1255 : DecoderTableThumb2CoProc32;
1256 Result =
1257 decodeInstruction(DecoderTable, MI, Insn32, Address, this, STI);
1258 if (Result != MCDisassembler::Fail) {
1259 Size = 4;
1260 Check(Result, AddThumbPredicate(MI));
1261 return Result;
1262 }
1263
1264 Size = 0;
1265 return MCDisassembler::Fail;
1266 }
1267
LLVMInitializeARMDisassembler()1268 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMDisassembler() {
1269 TargetRegistry::RegisterMCDisassembler(getTheARMLETarget(),
1270 createARMDisassembler);
1271 TargetRegistry::RegisterMCDisassembler(getTheARMBETarget(),
1272 createARMDisassembler);
1273 TargetRegistry::RegisterMCDisassembler(getTheThumbLETarget(),
1274 createARMDisassembler);
1275 TargetRegistry::RegisterMCDisassembler(getTheThumbBETarget(),
1276 createARMDisassembler);
1277 }
1278
1279 static const uint16_t GPRDecoderTable[] = {
1280 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1281 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1282 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1283 ARM::R12, ARM::SP, ARM::LR, ARM::PC
1284 };
1285
1286 static const uint16_t CLRMGPRDecoderTable[] = {
1287 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1288 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1289 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1290 ARM::R12, 0, ARM::LR, ARM::APSR
1291 };
1292
DecodeGPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1293 static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1294 uint64_t Address,
1295 const MCDisassembler *Decoder) {
1296 if (RegNo > 15)
1297 return MCDisassembler::Fail;
1298
1299 unsigned Register = GPRDecoderTable[RegNo];
1300 Inst.addOperand(MCOperand::createReg(Register));
1301 return MCDisassembler::Success;
1302 }
1303
DecodeCLRMGPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1304 static DecodeStatus DecodeCLRMGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1305 uint64_t Address,
1306 const MCDisassembler *Decoder) {
1307 if (RegNo > 15)
1308 return MCDisassembler::Fail;
1309
1310 unsigned Register = CLRMGPRDecoderTable[RegNo];
1311 if (Register == 0)
1312 return MCDisassembler::Fail;
1313
1314 Inst.addOperand(MCOperand::createReg(Register));
1315 return MCDisassembler::Success;
1316 }
1317
DecodeGPRnopcRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1318 static DecodeStatus DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo,
1319 uint64_t Address,
1320 const MCDisassembler *Decoder) {
1321 DecodeStatus S = MCDisassembler::Success;
1322
1323 if (RegNo == 15)
1324 S = MCDisassembler::SoftFail;
1325
1326 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1327
1328 return S;
1329 }
1330
DecodeGPRnospRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1331 static DecodeStatus DecodeGPRnospRegisterClass(MCInst &Inst, unsigned RegNo,
1332 uint64_t Address,
1333 const MCDisassembler *Decoder) {
1334 DecodeStatus S = MCDisassembler::Success;
1335
1336 if (RegNo == 13)
1337 S = MCDisassembler::SoftFail;
1338
1339 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1340
1341 return S;
1342 }
1343
1344 static DecodeStatus
DecodeGPRwithAPSRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1345 DecodeGPRwithAPSRRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1346 const MCDisassembler *Decoder) {
1347 DecodeStatus S = MCDisassembler::Success;
1348
1349 if (RegNo == 15)
1350 {
1351 Inst.addOperand(MCOperand::createReg(ARM::APSR_NZCV));
1352 return MCDisassembler::Success;
1353 }
1354
1355 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1356 return S;
1357 }
1358
1359 static DecodeStatus
DecodeGPRwithZRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1360 DecodeGPRwithZRRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1361 const MCDisassembler *Decoder) {
1362 DecodeStatus S = MCDisassembler::Success;
1363
1364 if (RegNo == 15)
1365 {
1366 Inst.addOperand(MCOperand::createReg(ARM::ZR));
1367 return MCDisassembler::Success;
1368 }
1369
1370 if (RegNo == 13)
1371 Check(S, MCDisassembler::SoftFail);
1372
1373 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1374 return S;
1375 }
1376
1377 static DecodeStatus
DecodeGPRwithZRnospRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1378 DecodeGPRwithZRnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1379 const MCDisassembler *Decoder) {
1380 DecodeStatus S = MCDisassembler::Success;
1381 if (RegNo == 13)
1382 return MCDisassembler::Fail;
1383 Check(S, DecodeGPRwithZRRegisterClass(Inst, RegNo, Address, Decoder));
1384 return S;
1385 }
1386
DecodetGPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1387 static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1388 uint64_t Address,
1389 const MCDisassembler *Decoder) {
1390 if (RegNo > 7)
1391 return MCDisassembler::Fail;
1392 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder);
1393 }
1394
1395 static const uint16_t GPRPairDecoderTable[] = {
1396 ARM::R0_R1, ARM::R2_R3, ARM::R4_R5, ARM::R6_R7,
1397 ARM::R8_R9, ARM::R10_R11, ARM::R12_SP
1398 };
1399
DecodeGPRPairRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1400 static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
1401 uint64_t Address,
1402 const MCDisassembler *Decoder) {
1403 DecodeStatus S = MCDisassembler::Success;
1404
1405 // According to the Arm ARM RegNo = 14 is undefined, but we return fail
1406 // rather than SoftFail as there is no GPRPair table entry for index 7.
1407 if (RegNo > 13)
1408 return MCDisassembler::Fail;
1409
1410 if (RegNo & 1)
1411 S = MCDisassembler::SoftFail;
1412
1413 unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
1414 Inst.addOperand(MCOperand::createReg(RegisterPair));
1415 return S;
1416 }
1417
1418 static DecodeStatus
DecodeGPRPairnospRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1419 DecodeGPRPairnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1420 const MCDisassembler *Decoder) {
1421 if (RegNo > 13)
1422 return MCDisassembler::Fail;
1423
1424 unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
1425 Inst.addOperand(MCOperand::createReg(RegisterPair));
1426
1427 if ((RegNo & 1) || RegNo > 10)
1428 return MCDisassembler::SoftFail;
1429 return MCDisassembler::Success;
1430 }
1431
DecodeGPRspRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1432 static DecodeStatus DecodeGPRspRegisterClass(MCInst &Inst, unsigned RegNo,
1433 uint64_t Address,
1434 const MCDisassembler *Decoder) {
1435 if (RegNo != 13)
1436 return MCDisassembler::Fail;
1437
1438 unsigned Register = GPRDecoderTable[RegNo];
1439 Inst.addOperand(MCOperand::createReg(Register));
1440 return MCDisassembler::Success;
1441 }
1442
DecodetcGPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1443 static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1444 uint64_t Address,
1445 const MCDisassembler *Decoder) {
1446 unsigned Register = 0;
1447 switch (RegNo) {
1448 case 0:
1449 Register = ARM::R0;
1450 break;
1451 case 1:
1452 Register = ARM::R1;
1453 break;
1454 case 2:
1455 Register = ARM::R2;
1456 break;
1457 case 3:
1458 Register = ARM::R3;
1459 break;
1460 case 9:
1461 Register = ARM::R9;
1462 break;
1463 case 12:
1464 Register = ARM::R12;
1465 break;
1466 default:
1467 return MCDisassembler::Fail;
1468 }
1469
1470 Inst.addOperand(MCOperand::createReg(Register));
1471 return MCDisassembler::Success;
1472 }
1473
DecoderGPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1474 static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1475 uint64_t Address,
1476 const MCDisassembler *Decoder) {
1477 DecodeStatus S = MCDisassembler::Success;
1478
1479 const FeatureBitset &featureBits =
1480 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1481
1482 if ((RegNo == 13 && !featureBits[ARM::HasV8Ops]) || RegNo == 15)
1483 S = MCDisassembler::SoftFail;
1484
1485 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1486 return S;
1487 }
1488
1489 static const uint16_t SPRDecoderTable[] = {
1490 ARM::S0, ARM::S1, ARM::S2, ARM::S3,
1491 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
1492 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
1493 ARM::S12, ARM::S13, ARM::S14, ARM::S15,
1494 ARM::S16, ARM::S17, ARM::S18, ARM::S19,
1495 ARM::S20, ARM::S21, ARM::S22, ARM::S23,
1496 ARM::S24, ARM::S25, ARM::S26, ARM::S27,
1497 ARM::S28, ARM::S29, ARM::S30, ARM::S31
1498 };
1499
DecodeSPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1500 static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
1501 uint64_t Address,
1502 const MCDisassembler *Decoder) {
1503 if (RegNo > 31)
1504 return MCDisassembler::Fail;
1505
1506 unsigned Register = SPRDecoderTable[RegNo];
1507 Inst.addOperand(MCOperand::createReg(Register));
1508 return MCDisassembler::Success;
1509 }
1510
DecodeHPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1511 static DecodeStatus DecodeHPRRegisterClass(MCInst &Inst, unsigned RegNo,
1512 uint64_t Address,
1513 const MCDisassembler *Decoder) {
1514 return DecodeSPRRegisterClass(Inst, RegNo, Address, Decoder);
1515 }
1516
1517 static const uint16_t DPRDecoderTable[] = {
1518 ARM::D0, ARM::D1, ARM::D2, ARM::D3,
1519 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
1520 ARM::D8, ARM::D9, ARM::D10, ARM::D11,
1521 ARM::D12, ARM::D13, ARM::D14, ARM::D15,
1522 ARM::D16, ARM::D17, ARM::D18, ARM::D19,
1523 ARM::D20, ARM::D21, ARM::D22, ARM::D23,
1524 ARM::D24, ARM::D25, ARM::D26, ARM::D27,
1525 ARM::D28, ARM::D29, ARM::D30, ARM::D31
1526 };
1527
DecodeDPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1528 static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
1529 uint64_t Address,
1530 const MCDisassembler *Decoder) {
1531 const FeatureBitset &featureBits =
1532 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1533
1534 bool hasD32 = featureBits[ARM::FeatureD32];
1535
1536 if (RegNo > 31 || (!hasD32 && RegNo > 15))
1537 return MCDisassembler::Fail;
1538
1539 unsigned Register = DPRDecoderTable[RegNo];
1540 Inst.addOperand(MCOperand::createReg(Register));
1541 return MCDisassembler::Success;
1542 }
1543
DecodeDPR_8RegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1544 static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
1545 uint64_t Address,
1546 const MCDisassembler *Decoder) {
1547 if (RegNo > 7)
1548 return MCDisassembler::Fail;
1549 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1550 }
1551
DecodeSPR_8RegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1552 static DecodeStatus DecodeSPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
1553 uint64_t Address,
1554 const MCDisassembler *Decoder) {
1555 if (RegNo > 15)
1556 return MCDisassembler::Fail;
1557 return DecodeSPRRegisterClass(Inst, RegNo, Address, Decoder);
1558 }
1559
DecodeDPR_VFP2RegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1560 static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo,
1561 uint64_t Address,
1562 const MCDisassembler *Decoder) {
1563 if (RegNo > 15)
1564 return MCDisassembler::Fail;
1565 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1566 }
1567
1568 static const uint16_t QPRDecoderTable[] = {
1569 ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3,
1570 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7,
1571 ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11,
1572 ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15
1573 };
1574
DecodeQPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1575 static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
1576 uint64_t Address,
1577 const MCDisassembler *Decoder) {
1578 if (RegNo > 31 || (RegNo & 1) != 0)
1579 return MCDisassembler::Fail;
1580 RegNo >>= 1;
1581
1582 unsigned Register = QPRDecoderTable[RegNo];
1583 Inst.addOperand(MCOperand::createReg(Register));
1584 return MCDisassembler::Success;
1585 }
1586
1587 static const uint16_t DPairDecoderTable[] = {
1588 ARM::Q0, ARM::D1_D2, ARM::Q1, ARM::D3_D4, ARM::Q2, ARM::D5_D6,
1589 ARM::Q3, ARM::D7_D8, ARM::Q4, ARM::D9_D10, ARM::Q5, ARM::D11_D12,
1590 ARM::Q6, ARM::D13_D14, ARM::Q7, ARM::D15_D16, ARM::Q8, ARM::D17_D18,
1591 ARM::Q9, ARM::D19_D20, ARM::Q10, ARM::D21_D22, ARM::Q11, ARM::D23_D24,
1592 ARM::Q12, ARM::D25_D26, ARM::Q13, ARM::D27_D28, ARM::Q14, ARM::D29_D30,
1593 ARM::Q15
1594 };
1595
DecodeDPairRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1596 static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
1597 uint64_t Address,
1598 const MCDisassembler *Decoder) {
1599 if (RegNo > 30)
1600 return MCDisassembler::Fail;
1601
1602 unsigned Register = DPairDecoderTable[RegNo];
1603 Inst.addOperand(MCOperand::createReg(Register));
1604 return MCDisassembler::Success;
1605 }
1606
1607 static const uint16_t DPairSpacedDecoderTable[] = {
1608 ARM::D0_D2, ARM::D1_D3, ARM::D2_D4, ARM::D3_D5,
1609 ARM::D4_D6, ARM::D5_D7, ARM::D6_D8, ARM::D7_D9,
1610 ARM::D8_D10, ARM::D9_D11, ARM::D10_D12, ARM::D11_D13,
1611 ARM::D12_D14, ARM::D13_D15, ARM::D14_D16, ARM::D15_D17,
1612 ARM::D16_D18, ARM::D17_D19, ARM::D18_D20, ARM::D19_D21,
1613 ARM::D20_D22, ARM::D21_D23, ARM::D22_D24, ARM::D23_D25,
1614 ARM::D24_D26, ARM::D25_D27, ARM::D26_D28, ARM::D27_D29,
1615 ARM::D28_D30, ARM::D29_D31
1616 };
1617
1618 static DecodeStatus
DecodeDPairSpacedRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)1619 DecodeDPairSpacedRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1620 const MCDisassembler *Decoder) {
1621 if (RegNo > 29)
1622 return MCDisassembler::Fail;
1623
1624 unsigned Register = DPairSpacedDecoderTable[RegNo];
1625 Inst.addOperand(MCOperand::createReg(Register));
1626 return MCDisassembler::Success;
1627 }
1628
DecodePredicateOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)1629 static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
1630 uint64_t Address,
1631 const MCDisassembler *Decoder) {
1632 DecodeStatus S = MCDisassembler::Success;
1633 if (Val == 0xF) return MCDisassembler::Fail;
1634 // AL predicate is not allowed on Thumb1 branches.
1635 if (Inst.getOpcode() == ARM::tBcc && Val == 0xE)
1636 return MCDisassembler::Fail;
1637 const MCInstrInfo *MCII =
1638 static_cast<const ARMDisassembler *>(Decoder)->MCII.get();
1639 if (Val != ARMCC::AL && !MCII->get(Inst.getOpcode()).isPredicable())
1640 Check(S, MCDisassembler::SoftFail);
1641 Inst.addOperand(MCOperand::createImm(Val));
1642 if (Val == ARMCC::AL) {
1643 Inst.addOperand(MCOperand::createReg(0));
1644 } else
1645 Inst.addOperand(MCOperand::createReg(ARM::CPSR));
1646 return S;
1647 }
1648
DecodeCCOutOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)1649 static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
1650 uint64_t Address,
1651 const MCDisassembler *Decoder) {
1652 if (Val)
1653 Inst.addOperand(MCOperand::createReg(ARM::CPSR));
1654 else
1655 Inst.addOperand(MCOperand::createReg(0));
1656 return MCDisassembler::Success;
1657 }
1658
DecodeSORegImmOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)1659 static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Val,
1660 uint64_t Address,
1661 const MCDisassembler *Decoder) {
1662 DecodeStatus S = MCDisassembler::Success;
1663
1664 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1665 unsigned type = fieldFromInstruction(Val, 5, 2);
1666 unsigned imm = fieldFromInstruction(Val, 7, 5);
1667
1668 // Register-immediate
1669 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
1670 return MCDisassembler::Fail;
1671
1672 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1673 switch (type) {
1674 case 0:
1675 Shift = ARM_AM::lsl;
1676 break;
1677 case 1:
1678 Shift = ARM_AM::lsr;
1679 break;
1680 case 2:
1681 Shift = ARM_AM::asr;
1682 break;
1683 case 3:
1684 Shift = ARM_AM::ror;
1685 break;
1686 }
1687
1688 if (Shift == ARM_AM::ror && imm == 0)
1689 Shift = ARM_AM::rrx;
1690
1691 unsigned Op = Shift | (imm << 3);
1692 Inst.addOperand(MCOperand::createImm(Op));
1693
1694 return S;
1695 }
1696
DecodeSORegRegOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)1697 static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Val,
1698 uint64_t Address,
1699 const MCDisassembler *Decoder) {
1700 DecodeStatus S = MCDisassembler::Success;
1701
1702 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1703 unsigned type = fieldFromInstruction(Val, 5, 2);
1704 unsigned Rs = fieldFromInstruction(Val, 8, 4);
1705
1706 // Register-register
1707 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1708 return MCDisassembler::Fail;
1709 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder)))
1710 return MCDisassembler::Fail;
1711
1712 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1713 switch (type) {
1714 case 0:
1715 Shift = ARM_AM::lsl;
1716 break;
1717 case 1:
1718 Shift = ARM_AM::lsr;
1719 break;
1720 case 2:
1721 Shift = ARM_AM::asr;
1722 break;
1723 case 3:
1724 Shift = ARM_AM::ror;
1725 break;
1726 }
1727
1728 Inst.addOperand(MCOperand::createImm(Shift));
1729
1730 return S;
1731 }
1732
DecodeRegListOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)1733 static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
1734 uint64_t Address,
1735 const MCDisassembler *Decoder) {
1736 DecodeStatus S = MCDisassembler::Success;
1737
1738 bool NeedDisjointWriteback = false;
1739 unsigned WritebackReg = 0;
1740 bool CLRM = false;
1741 switch (Inst.getOpcode()) {
1742 default:
1743 break;
1744 case ARM::LDMIA_UPD:
1745 case ARM::LDMDB_UPD:
1746 case ARM::LDMIB_UPD:
1747 case ARM::LDMDA_UPD:
1748 case ARM::t2LDMIA_UPD:
1749 case ARM::t2LDMDB_UPD:
1750 case ARM::t2STMIA_UPD:
1751 case ARM::t2STMDB_UPD:
1752 NeedDisjointWriteback = true;
1753 WritebackReg = Inst.getOperand(0).getReg();
1754 break;
1755 case ARM::t2CLRM:
1756 CLRM = true;
1757 break;
1758 }
1759
1760 // Empty register lists are not allowed.
1761 if (Val == 0) return MCDisassembler::Fail;
1762 for (unsigned i = 0; i < 16; ++i) {
1763 if (Val & (1 << i)) {
1764 if (CLRM) {
1765 if (!Check(S, DecodeCLRMGPRRegisterClass(Inst, i, Address, Decoder))) {
1766 return MCDisassembler::Fail;
1767 }
1768 } else {
1769 if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder)))
1770 return MCDisassembler::Fail;
1771 // Writeback not allowed if Rn is in the target list.
1772 if (NeedDisjointWriteback && WritebackReg == Inst.end()[-1].getReg())
1773 Check(S, MCDisassembler::SoftFail);
1774 }
1775 }
1776 }
1777
1778 return S;
1779 }
1780
DecodeSPRRegListOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)1781 static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
1782 uint64_t Address,
1783 const MCDisassembler *Decoder) {
1784 DecodeStatus S = MCDisassembler::Success;
1785
1786 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1787 unsigned regs = fieldFromInstruction(Val, 0, 8);
1788
1789 // In case of unpredictable encoding, tweak the operands.
1790 if (regs == 0 || (Vd + regs) > 32) {
1791 regs = Vd + regs > 32 ? 32 - Vd : regs;
1792 regs = std::max( 1u, regs);
1793 S = MCDisassembler::SoftFail;
1794 }
1795
1796 if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder)))
1797 return MCDisassembler::Fail;
1798 for (unsigned i = 0; i < (regs - 1); ++i) {
1799 if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1800 return MCDisassembler::Fail;
1801 }
1802
1803 return S;
1804 }
1805
DecodeDPRRegListOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)1806 static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
1807 uint64_t Address,
1808 const MCDisassembler *Decoder) {
1809 DecodeStatus S = MCDisassembler::Success;
1810
1811 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1812 unsigned regs = fieldFromInstruction(Val, 1, 7);
1813
1814 // In case of unpredictable encoding, tweak the operands.
1815 if (regs == 0 || regs > 16 || (Vd + regs) > 32) {
1816 regs = Vd + regs > 32 ? 32 - Vd : regs;
1817 regs = std::max( 1u, regs);
1818 regs = std::min(16u, regs);
1819 S = MCDisassembler::SoftFail;
1820 }
1821
1822 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
1823 return MCDisassembler::Fail;
1824 for (unsigned i = 0; i < (regs - 1); ++i) {
1825 if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1826 return MCDisassembler::Fail;
1827 }
1828
1829 return S;
1830 }
1831
DecodeBitfieldMaskOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)1832 static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Val,
1833 uint64_t Address,
1834 const MCDisassembler *Decoder) {
1835 // This operand encodes a mask of contiguous zeros between a specified MSB
1836 // and LSB. To decode it, we create the mask of all bits MSB-and-lower,
1837 // the mask of all bits LSB-and-lower, and then xor them to create
1838 // the mask of that's all ones on [msb, lsb]. Finally we not it to
1839 // create the final mask.
1840 unsigned msb = fieldFromInstruction(Val, 5, 5);
1841 unsigned lsb = fieldFromInstruction(Val, 0, 5);
1842
1843 DecodeStatus S = MCDisassembler::Success;
1844 if (lsb > msb) {
1845 Check(S, MCDisassembler::SoftFail);
1846 // The check above will cause the warning for the "potentially undefined
1847 // instruction encoding" but we can't build a bad MCOperand value here
1848 // with a lsb > msb or else printing the MCInst will cause a crash.
1849 lsb = msb;
1850 }
1851
1852 uint32_t msb_mask = 0xFFFFFFFF;
1853 if (msb != 31) msb_mask = (1U << (msb+1)) - 1;
1854 uint32_t lsb_mask = (1U << lsb) - 1;
1855
1856 Inst.addOperand(MCOperand::createImm(~(msb_mask ^ lsb_mask)));
1857 return S;
1858 }
1859
DecodeCopMemInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)1860 static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
1861 uint64_t Address,
1862 const MCDisassembler *Decoder) {
1863 DecodeStatus S = MCDisassembler::Success;
1864
1865 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1866 unsigned CRd = fieldFromInstruction(Insn, 12, 4);
1867 unsigned coproc = fieldFromInstruction(Insn, 8, 4);
1868 unsigned imm = fieldFromInstruction(Insn, 0, 8);
1869 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1870 unsigned U = fieldFromInstruction(Insn, 23, 1);
1871 const FeatureBitset &featureBits =
1872 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1873
1874 switch (Inst.getOpcode()) {
1875 case ARM::LDC_OFFSET:
1876 case ARM::LDC_PRE:
1877 case ARM::LDC_POST:
1878 case ARM::LDC_OPTION:
1879 case ARM::LDCL_OFFSET:
1880 case ARM::LDCL_PRE:
1881 case ARM::LDCL_POST:
1882 case ARM::LDCL_OPTION:
1883 case ARM::STC_OFFSET:
1884 case ARM::STC_PRE:
1885 case ARM::STC_POST:
1886 case ARM::STC_OPTION:
1887 case ARM::STCL_OFFSET:
1888 case ARM::STCL_PRE:
1889 case ARM::STCL_POST:
1890 case ARM::STCL_OPTION:
1891 case ARM::t2LDC_OFFSET:
1892 case ARM::t2LDC_PRE:
1893 case ARM::t2LDC_POST:
1894 case ARM::t2LDC_OPTION:
1895 case ARM::t2LDCL_OFFSET:
1896 case ARM::t2LDCL_PRE:
1897 case ARM::t2LDCL_POST:
1898 case ARM::t2LDCL_OPTION:
1899 case ARM::t2STC_OFFSET:
1900 case ARM::t2STC_PRE:
1901 case ARM::t2STC_POST:
1902 case ARM::t2STC_OPTION:
1903 case ARM::t2STCL_OFFSET:
1904 case ARM::t2STCL_PRE:
1905 case ARM::t2STCL_POST:
1906 case ARM::t2STCL_OPTION:
1907 case ARM::t2LDC2_OFFSET:
1908 case ARM::t2LDC2L_OFFSET:
1909 case ARM::t2LDC2_PRE:
1910 case ARM::t2LDC2L_PRE:
1911 case ARM::t2STC2_OFFSET:
1912 case ARM::t2STC2L_OFFSET:
1913 case ARM::t2STC2_PRE:
1914 case ARM::t2STC2L_PRE:
1915 case ARM::LDC2_OFFSET:
1916 case ARM::LDC2L_OFFSET:
1917 case ARM::LDC2_PRE:
1918 case ARM::LDC2L_PRE:
1919 case ARM::STC2_OFFSET:
1920 case ARM::STC2L_OFFSET:
1921 case ARM::STC2_PRE:
1922 case ARM::STC2L_PRE:
1923 case ARM::t2LDC2_OPTION:
1924 case ARM::t2STC2_OPTION:
1925 case ARM::t2LDC2_POST:
1926 case ARM::t2LDC2L_POST:
1927 case ARM::t2STC2_POST:
1928 case ARM::t2STC2L_POST:
1929 case ARM::LDC2_POST:
1930 case ARM::LDC2L_POST:
1931 case ARM::STC2_POST:
1932 case ARM::STC2L_POST:
1933 if (coproc == 0xA || coproc == 0xB ||
1934 (featureBits[ARM::HasV8_1MMainlineOps] &&
1935 (coproc == 0x8 || coproc == 0x9 || coproc == 0xA || coproc == 0xB ||
1936 coproc == 0xE || coproc == 0xF)))
1937 return MCDisassembler::Fail;
1938 break;
1939 default:
1940 break;
1941 }
1942
1943 if (featureBits[ARM::HasV8Ops] && (coproc != 14))
1944 return MCDisassembler::Fail;
1945
1946 Inst.addOperand(MCOperand::createImm(coproc));
1947 Inst.addOperand(MCOperand::createImm(CRd));
1948 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1949 return MCDisassembler::Fail;
1950
1951 switch (Inst.getOpcode()) {
1952 case ARM::t2LDC2_OFFSET:
1953 case ARM::t2LDC2L_OFFSET:
1954 case ARM::t2LDC2_PRE:
1955 case ARM::t2LDC2L_PRE:
1956 case ARM::t2STC2_OFFSET:
1957 case ARM::t2STC2L_OFFSET:
1958 case ARM::t2STC2_PRE:
1959 case ARM::t2STC2L_PRE:
1960 case ARM::LDC2_OFFSET:
1961 case ARM::LDC2L_OFFSET:
1962 case ARM::LDC2_PRE:
1963 case ARM::LDC2L_PRE:
1964 case ARM::STC2_OFFSET:
1965 case ARM::STC2L_OFFSET:
1966 case ARM::STC2_PRE:
1967 case ARM::STC2L_PRE:
1968 case ARM::t2LDC_OFFSET:
1969 case ARM::t2LDCL_OFFSET:
1970 case ARM::t2LDC_PRE:
1971 case ARM::t2LDCL_PRE:
1972 case ARM::t2STC_OFFSET:
1973 case ARM::t2STCL_OFFSET:
1974 case ARM::t2STC_PRE:
1975 case ARM::t2STCL_PRE:
1976 case ARM::LDC_OFFSET:
1977 case ARM::LDCL_OFFSET:
1978 case ARM::LDC_PRE:
1979 case ARM::LDCL_PRE:
1980 case ARM::STC_OFFSET:
1981 case ARM::STCL_OFFSET:
1982 case ARM::STC_PRE:
1983 case ARM::STCL_PRE:
1984 imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm);
1985 Inst.addOperand(MCOperand::createImm(imm));
1986 break;
1987 case ARM::t2LDC2_POST:
1988 case ARM::t2LDC2L_POST:
1989 case ARM::t2STC2_POST:
1990 case ARM::t2STC2L_POST:
1991 case ARM::LDC2_POST:
1992 case ARM::LDC2L_POST:
1993 case ARM::STC2_POST:
1994 case ARM::STC2L_POST:
1995 case ARM::t2LDC_POST:
1996 case ARM::t2LDCL_POST:
1997 case ARM::t2STC_POST:
1998 case ARM::t2STCL_POST:
1999 case ARM::LDC_POST:
2000 case ARM::LDCL_POST:
2001 case ARM::STC_POST:
2002 case ARM::STCL_POST:
2003 imm |= U << 8;
2004 [[fallthrough]];
2005 default:
2006 // The 'option' variant doesn't encode 'U' in the immediate since
2007 // the immediate is unsigned [0,255].
2008 Inst.addOperand(MCOperand::createImm(imm));
2009 break;
2010 }
2011
2012 switch (Inst.getOpcode()) {
2013 case ARM::LDC_OFFSET:
2014 case ARM::LDC_PRE:
2015 case ARM::LDC_POST:
2016 case ARM::LDC_OPTION:
2017 case ARM::LDCL_OFFSET:
2018 case ARM::LDCL_PRE:
2019 case ARM::LDCL_POST:
2020 case ARM::LDCL_OPTION:
2021 case ARM::STC_OFFSET:
2022 case ARM::STC_PRE:
2023 case ARM::STC_POST:
2024 case ARM::STC_OPTION:
2025 case ARM::STCL_OFFSET:
2026 case ARM::STCL_PRE:
2027 case ARM::STCL_POST:
2028 case ARM::STCL_OPTION:
2029 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2030 return MCDisassembler::Fail;
2031 break;
2032 default:
2033 break;
2034 }
2035
2036 return S;
2037 }
2038
2039 static DecodeStatus
DecodeAddrMode2IdxInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2040 DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
2041 const MCDisassembler *Decoder) {
2042 DecodeStatus S = MCDisassembler::Success;
2043
2044 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2045 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
2046 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2047 unsigned imm = fieldFromInstruction(Insn, 0, 12);
2048 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2049 unsigned reg = fieldFromInstruction(Insn, 25, 1);
2050 unsigned P = fieldFromInstruction(Insn, 24, 1);
2051 unsigned W = fieldFromInstruction(Insn, 21, 1);
2052
2053 // On stores, the writeback operand precedes Rt.
2054 switch (Inst.getOpcode()) {
2055 case ARM::STR_POST_IMM:
2056 case ARM::STR_POST_REG:
2057 case ARM::STRB_POST_IMM:
2058 case ARM::STRB_POST_REG:
2059 case ARM::STRT_POST_REG:
2060 case ARM::STRT_POST_IMM:
2061 case ARM::STRBT_POST_REG:
2062 case ARM::STRBT_POST_IMM:
2063 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2064 return MCDisassembler::Fail;
2065 break;
2066 default:
2067 break;
2068 }
2069
2070 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
2071 return MCDisassembler::Fail;
2072
2073 // On loads, the writeback operand comes after Rt.
2074 switch (Inst.getOpcode()) {
2075 case ARM::LDR_POST_IMM:
2076 case ARM::LDR_POST_REG:
2077 case ARM::LDRB_POST_IMM:
2078 case ARM::LDRB_POST_REG:
2079 case ARM::LDRBT_POST_REG:
2080 case ARM::LDRBT_POST_IMM:
2081 case ARM::LDRT_POST_REG:
2082 case ARM::LDRT_POST_IMM:
2083 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2084 return MCDisassembler::Fail;
2085 break;
2086 default:
2087 break;
2088 }
2089
2090 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2091 return MCDisassembler::Fail;
2092
2093 ARM_AM::AddrOpc Op = ARM_AM::add;
2094 if (!fieldFromInstruction(Insn, 23, 1))
2095 Op = ARM_AM::sub;
2096
2097 bool writeback = (P == 0) || (W == 1);
2098 unsigned idx_mode = 0;
2099 if (P && writeback)
2100 idx_mode = ARMII::IndexModePre;
2101 else if (!P && writeback)
2102 idx_mode = ARMII::IndexModePost;
2103
2104 if (writeback && (Rn == 15 || Rn == Rt))
2105 S = MCDisassembler::SoftFail; // UNPREDICTABLE
2106
2107 if (reg) {
2108 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2109 return MCDisassembler::Fail;
2110 ARM_AM::ShiftOpc Opc = ARM_AM::lsl;
2111 switch( fieldFromInstruction(Insn, 5, 2)) {
2112 case 0:
2113 Opc = ARM_AM::lsl;
2114 break;
2115 case 1:
2116 Opc = ARM_AM::lsr;
2117 break;
2118 case 2:
2119 Opc = ARM_AM::asr;
2120 break;
2121 case 3:
2122 Opc = ARM_AM::ror;
2123 break;
2124 default:
2125 return MCDisassembler::Fail;
2126 }
2127 unsigned amt = fieldFromInstruction(Insn, 7, 5);
2128 if (Opc == ARM_AM::ror && amt == 0)
2129 Opc = ARM_AM::rrx;
2130 unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode);
2131
2132 Inst.addOperand(MCOperand::createImm(imm));
2133 } else {
2134 Inst.addOperand(MCOperand::createReg(0));
2135 unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode);
2136 Inst.addOperand(MCOperand::createImm(tmp));
2137 }
2138
2139 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2140 return MCDisassembler::Fail;
2141
2142 return S;
2143 }
2144
DecodeSORegMemOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)2145 static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Val,
2146 uint64_t Address,
2147 const MCDisassembler *Decoder) {
2148 DecodeStatus S = MCDisassembler::Success;
2149
2150 unsigned Rn = fieldFromInstruction(Val, 13, 4);
2151 unsigned Rm = fieldFromInstruction(Val, 0, 4);
2152 unsigned type = fieldFromInstruction(Val, 5, 2);
2153 unsigned imm = fieldFromInstruction(Val, 7, 5);
2154 unsigned U = fieldFromInstruction(Val, 12, 1);
2155
2156 ARM_AM::ShiftOpc ShOp = ARM_AM::lsl;
2157 switch (type) {
2158 case 0:
2159 ShOp = ARM_AM::lsl;
2160 break;
2161 case 1:
2162 ShOp = ARM_AM::lsr;
2163 break;
2164 case 2:
2165 ShOp = ARM_AM::asr;
2166 break;
2167 case 3:
2168 ShOp = ARM_AM::ror;
2169 break;
2170 }
2171
2172 if (ShOp == ARM_AM::ror && imm == 0)
2173 ShOp = ARM_AM::rrx;
2174
2175 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2176 return MCDisassembler::Fail;
2177 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2178 return MCDisassembler::Fail;
2179 unsigned shift;
2180 if (U)
2181 shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp);
2182 else
2183 shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp);
2184 Inst.addOperand(MCOperand::createImm(shift));
2185
2186 return S;
2187 }
2188
DecodeTSBInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2189 static DecodeStatus DecodeTSBInstruction(MCInst &Inst, unsigned Insn,
2190 uint64_t Address,
2191 const MCDisassembler *Decoder) {
2192 if (Inst.getOpcode() != ARM::TSB && Inst.getOpcode() != ARM::t2TSB)
2193 return MCDisassembler::Fail;
2194
2195 // The "csync" operand is not encoded into the "tsb" instruction (as this is
2196 // the only available operand), but LLVM expects the instruction to have one
2197 // operand, so we need to add the csync when decoding.
2198 Inst.addOperand(MCOperand::createImm(ARM_TSB::CSYNC));
2199 return MCDisassembler::Success;
2200 }
2201
DecodeAddrMode3Instruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2202 static DecodeStatus DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn,
2203 uint64_t Address,
2204 const MCDisassembler *Decoder) {
2205 DecodeStatus S = MCDisassembler::Success;
2206
2207 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
2208 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2209 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2210 unsigned type = fieldFromInstruction(Insn, 22, 1);
2211 unsigned imm = fieldFromInstruction(Insn, 8, 4);
2212 unsigned U = ((~fieldFromInstruction(Insn, 23, 1)) & 1) << 8;
2213 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2214 unsigned W = fieldFromInstruction(Insn, 21, 1);
2215 unsigned P = fieldFromInstruction(Insn, 24, 1);
2216 unsigned Rt2 = Rt + 1;
2217
2218 bool writeback = (W == 1) | (P == 0);
2219
2220 // For {LD,ST}RD, Rt must be even, else undefined.
2221 switch (Inst.getOpcode()) {
2222 case ARM::STRD:
2223 case ARM::STRD_PRE:
2224 case ARM::STRD_POST:
2225 case ARM::LDRD:
2226 case ARM::LDRD_PRE:
2227 case ARM::LDRD_POST:
2228 if (Rt & 0x1) S = MCDisassembler::SoftFail;
2229 break;
2230 default:
2231 break;
2232 }
2233 switch (Inst.getOpcode()) {
2234 case ARM::STRD:
2235 case ARM::STRD_PRE:
2236 case ARM::STRD_POST:
2237 if (P == 0 && W == 1)
2238 S = MCDisassembler::SoftFail;
2239
2240 if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2))
2241 S = MCDisassembler::SoftFail;
2242 if (type && Rm == 15)
2243 S = MCDisassembler::SoftFail;
2244 if (Rt2 == 15)
2245 S = MCDisassembler::SoftFail;
2246 if (!type && fieldFromInstruction(Insn, 8, 4))
2247 S = MCDisassembler::SoftFail;
2248 break;
2249 case ARM::STRH:
2250 case ARM::STRH_PRE:
2251 case ARM::STRH_POST:
2252 if (Rt == 15)
2253 S = MCDisassembler::SoftFail;
2254 if (writeback && (Rn == 15 || Rn == Rt))
2255 S = MCDisassembler::SoftFail;
2256 if (!type && Rm == 15)
2257 S = MCDisassembler::SoftFail;
2258 break;
2259 case ARM::LDRD:
2260 case ARM::LDRD_PRE:
2261 case ARM::LDRD_POST:
2262 if (type && Rn == 15) {
2263 if (Rt2 == 15)
2264 S = MCDisassembler::SoftFail;
2265 break;
2266 }
2267 if (P == 0 && W == 1)
2268 S = MCDisassembler::SoftFail;
2269 if (!type && (Rt2 == 15 || Rm == 15 || Rm == Rt || Rm == Rt2))
2270 S = MCDisassembler::SoftFail;
2271 if (!type && writeback && Rn == 15)
2272 S = MCDisassembler::SoftFail;
2273 if (writeback && (Rn == Rt || Rn == Rt2))
2274 S = MCDisassembler::SoftFail;
2275 break;
2276 case ARM::LDRH:
2277 case ARM::LDRH_PRE:
2278 case ARM::LDRH_POST:
2279 if (type && Rn == 15) {
2280 if (Rt == 15)
2281 S = MCDisassembler::SoftFail;
2282 break;
2283 }
2284 if (Rt == 15)
2285 S = MCDisassembler::SoftFail;
2286 if (!type && Rm == 15)
2287 S = MCDisassembler::SoftFail;
2288 if (!type && writeback && (Rn == 15 || Rn == Rt))
2289 S = MCDisassembler::SoftFail;
2290 break;
2291 case ARM::LDRSH:
2292 case ARM::LDRSH_PRE:
2293 case ARM::LDRSH_POST:
2294 case ARM::LDRSB:
2295 case ARM::LDRSB_PRE:
2296 case ARM::LDRSB_POST:
2297 if (type && Rn == 15) {
2298 if (Rt == 15)
2299 S = MCDisassembler::SoftFail;
2300 break;
2301 }
2302 if (type && (Rt == 15 || (writeback && Rn == Rt)))
2303 S = MCDisassembler::SoftFail;
2304 if (!type && (Rt == 15 || Rm == 15))
2305 S = MCDisassembler::SoftFail;
2306 if (!type && writeback && (Rn == 15 || Rn == Rt))
2307 S = MCDisassembler::SoftFail;
2308 break;
2309 default:
2310 break;
2311 }
2312
2313 if (writeback) { // Writeback
2314 if (P)
2315 U |= ARMII::IndexModePre << 9;
2316 else
2317 U |= ARMII::IndexModePost << 9;
2318
2319 // On stores, the writeback operand precedes Rt.
2320 switch (Inst.getOpcode()) {
2321 case ARM::STRD:
2322 case ARM::STRD_PRE:
2323 case ARM::STRD_POST:
2324 case ARM::STRH:
2325 case ARM::STRH_PRE:
2326 case ARM::STRH_POST:
2327 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2328 return MCDisassembler::Fail;
2329 break;
2330 default:
2331 break;
2332 }
2333 }
2334
2335 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
2336 return MCDisassembler::Fail;
2337 switch (Inst.getOpcode()) {
2338 case ARM::STRD:
2339 case ARM::STRD_PRE:
2340 case ARM::STRD_POST:
2341 case ARM::LDRD:
2342 case ARM::LDRD_PRE:
2343 case ARM::LDRD_POST:
2344 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder)))
2345 return MCDisassembler::Fail;
2346 break;
2347 default:
2348 break;
2349 }
2350
2351 if (writeback) {
2352 // On loads, the writeback operand comes after Rt.
2353 switch (Inst.getOpcode()) {
2354 case ARM::LDRD:
2355 case ARM::LDRD_PRE:
2356 case ARM::LDRD_POST:
2357 case ARM::LDRH:
2358 case ARM::LDRH_PRE:
2359 case ARM::LDRH_POST:
2360 case ARM::LDRSH:
2361 case ARM::LDRSH_PRE:
2362 case ARM::LDRSH_POST:
2363 case ARM::LDRSB:
2364 case ARM::LDRSB_PRE:
2365 case ARM::LDRSB_POST:
2366 case ARM::LDRHTr:
2367 case ARM::LDRSBTr:
2368 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2369 return MCDisassembler::Fail;
2370 break;
2371 default:
2372 break;
2373 }
2374 }
2375
2376 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2377 return MCDisassembler::Fail;
2378
2379 if (type) {
2380 Inst.addOperand(MCOperand::createReg(0));
2381 Inst.addOperand(MCOperand::createImm(U | (imm << 4) | Rm));
2382 } else {
2383 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2384 return MCDisassembler::Fail;
2385 Inst.addOperand(MCOperand::createImm(U));
2386 }
2387
2388 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2389 return MCDisassembler::Fail;
2390
2391 return S;
2392 }
2393
DecodeRFEInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2394 static DecodeStatus DecodeRFEInstruction(MCInst &Inst, unsigned Insn,
2395 uint64_t Address,
2396 const MCDisassembler *Decoder) {
2397 DecodeStatus S = MCDisassembler::Success;
2398
2399 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2400 unsigned mode = fieldFromInstruction(Insn, 23, 2);
2401
2402 switch (mode) {
2403 case 0:
2404 mode = ARM_AM::da;
2405 break;
2406 case 1:
2407 mode = ARM_AM::ia;
2408 break;
2409 case 2:
2410 mode = ARM_AM::db;
2411 break;
2412 case 3:
2413 mode = ARM_AM::ib;
2414 break;
2415 }
2416
2417 Inst.addOperand(MCOperand::createImm(mode));
2418 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2419 return MCDisassembler::Fail;
2420
2421 return S;
2422 }
2423
DecodeQADDInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2424 static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
2425 uint64_t Address,
2426 const MCDisassembler *Decoder) {
2427 DecodeStatus S = MCDisassembler::Success;
2428
2429 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2430 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2431 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2432 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2433
2434 if (pred == 0xF)
2435 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2436
2437 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2438 return MCDisassembler::Fail;
2439 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2440 return MCDisassembler::Fail;
2441 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2442 return MCDisassembler::Fail;
2443 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2444 return MCDisassembler::Fail;
2445 return S;
2446 }
2447
2448 static DecodeStatus
DecodeMemMultipleWritebackInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2449 DecodeMemMultipleWritebackInstruction(MCInst &Inst, unsigned Insn,
2450 uint64_t Address,
2451 const MCDisassembler *Decoder) {
2452 DecodeStatus S = MCDisassembler::Success;
2453
2454 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2455 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2456 unsigned reglist = fieldFromInstruction(Insn, 0, 16);
2457
2458 if (pred == 0xF) {
2459 // Ambiguous with RFE and SRS
2460 switch (Inst.getOpcode()) {
2461 case ARM::LDMDA:
2462 Inst.setOpcode(ARM::RFEDA);
2463 break;
2464 case ARM::LDMDA_UPD:
2465 Inst.setOpcode(ARM::RFEDA_UPD);
2466 break;
2467 case ARM::LDMDB:
2468 Inst.setOpcode(ARM::RFEDB);
2469 break;
2470 case ARM::LDMDB_UPD:
2471 Inst.setOpcode(ARM::RFEDB_UPD);
2472 break;
2473 case ARM::LDMIA:
2474 Inst.setOpcode(ARM::RFEIA);
2475 break;
2476 case ARM::LDMIA_UPD:
2477 Inst.setOpcode(ARM::RFEIA_UPD);
2478 break;
2479 case ARM::LDMIB:
2480 Inst.setOpcode(ARM::RFEIB);
2481 break;
2482 case ARM::LDMIB_UPD:
2483 Inst.setOpcode(ARM::RFEIB_UPD);
2484 break;
2485 case ARM::STMDA:
2486 Inst.setOpcode(ARM::SRSDA);
2487 break;
2488 case ARM::STMDA_UPD:
2489 Inst.setOpcode(ARM::SRSDA_UPD);
2490 break;
2491 case ARM::STMDB:
2492 Inst.setOpcode(ARM::SRSDB);
2493 break;
2494 case ARM::STMDB_UPD:
2495 Inst.setOpcode(ARM::SRSDB_UPD);
2496 break;
2497 case ARM::STMIA:
2498 Inst.setOpcode(ARM::SRSIA);
2499 break;
2500 case ARM::STMIA_UPD:
2501 Inst.setOpcode(ARM::SRSIA_UPD);
2502 break;
2503 case ARM::STMIB:
2504 Inst.setOpcode(ARM::SRSIB);
2505 break;
2506 case ARM::STMIB_UPD:
2507 Inst.setOpcode(ARM::SRSIB_UPD);
2508 break;
2509 default:
2510 return MCDisassembler::Fail;
2511 }
2512
2513 // For stores (which become SRS's, the only operand is the mode.
2514 if (fieldFromInstruction(Insn, 20, 1) == 0) {
2515 // Check SRS encoding constraints
2516 if (!(fieldFromInstruction(Insn, 22, 1) == 1 &&
2517 fieldFromInstruction(Insn, 20, 1) == 0))
2518 return MCDisassembler::Fail;
2519
2520 Inst.addOperand(
2521 MCOperand::createImm(fieldFromInstruction(Insn, 0, 4)));
2522 return S;
2523 }
2524
2525 return DecodeRFEInstruction(Inst, Insn, Address, Decoder);
2526 }
2527
2528 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2529 return MCDisassembler::Fail;
2530 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2531 return MCDisassembler::Fail; // Tied
2532 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2533 return MCDisassembler::Fail;
2534 if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder)))
2535 return MCDisassembler::Fail;
2536
2537 return S;
2538 }
2539
2540 // Check for UNPREDICTABLE predicated ESB instruction
DecodeHINTInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2541 static DecodeStatus DecodeHINTInstruction(MCInst &Inst, unsigned Insn,
2542 uint64_t Address,
2543 const MCDisassembler *Decoder) {
2544 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2545 unsigned imm8 = fieldFromInstruction(Insn, 0, 8);
2546 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
2547 const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits();
2548
2549 DecodeStatus S = MCDisassembler::Success;
2550
2551 Inst.addOperand(MCOperand::createImm(imm8));
2552
2553 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2554 return MCDisassembler::Fail;
2555
2556 // ESB is unpredictable if pred != AL. Without the RAS extension, it is a NOP,
2557 // so all predicates should be allowed.
2558 if (imm8 == 0x10 && pred != 0xe && ((FeatureBits[ARM::FeatureRAS]) != 0))
2559 S = MCDisassembler::SoftFail;
2560
2561 return S;
2562 }
2563
DecodeCPSInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2564 static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
2565 uint64_t Address,
2566 const MCDisassembler *Decoder) {
2567 unsigned imod = fieldFromInstruction(Insn, 18, 2);
2568 unsigned M = fieldFromInstruction(Insn, 17, 1);
2569 unsigned iflags = fieldFromInstruction(Insn, 6, 3);
2570 unsigned mode = fieldFromInstruction(Insn, 0, 5);
2571
2572 DecodeStatus S = MCDisassembler::Success;
2573
2574 // This decoder is called from multiple location that do not check
2575 // the full encoding is valid before they do.
2576 if (fieldFromInstruction(Insn, 5, 1) != 0 ||
2577 fieldFromInstruction(Insn, 16, 1) != 0 ||
2578 fieldFromInstruction(Insn, 20, 8) != 0x10)
2579 return MCDisassembler::Fail;
2580
2581 // imod == '01' --> UNPREDICTABLE
2582 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
2583 // return failure here. The '01' imod value is unprintable, so there's
2584 // nothing useful we could do even if we returned UNPREDICTABLE.
2585
2586 if (imod == 1) return MCDisassembler::Fail;
2587
2588 if (imod && M) {
2589 Inst.setOpcode(ARM::CPS3p);
2590 Inst.addOperand(MCOperand::createImm(imod));
2591 Inst.addOperand(MCOperand::createImm(iflags));
2592 Inst.addOperand(MCOperand::createImm(mode));
2593 } else if (imod && !M) {
2594 Inst.setOpcode(ARM::CPS2p);
2595 Inst.addOperand(MCOperand::createImm(imod));
2596 Inst.addOperand(MCOperand::createImm(iflags));
2597 if (mode) S = MCDisassembler::SoftFail;
2598 } else if (!imod && M) {
2599 Inst.setOpcode(ARM::CPS1p);
2600 Inst.addOperand(MCOperand::createImm(mode));
2601 if (iflags) S = MCDisassembler::SoftFail;
2602 } else {
2603 // imod == '00' && M == '0' --> UNPREDICTABLE
2604 Inst.setOpcode(ARM::CPS1p);
2605 Inst.addOperand(MCOperand::createImm(mode));
2606 S = MCDisassembler::SoftFail;
2607 }
2608
2609 return S;
2610 }
2611
DecodeT2CPSInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2612 static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
2613 uint64_t Address,
2614 const MCDisassembler *Decoder) {
2615 unsigned imod = fieldFromInstruction(Insn, 9, 2);
2616 unsigned M = fieldFromInstruction(Insn, 8, 1);
2617 unsigned iflags = fieldFromInstruction(Insn, 5, 3);
2618 unsigned mode = fieldFromInstruction(Insn, 0, 5);
2619
2620 DecodeStatus S = MCDisassembler::Success;
2621
2622 // imod == '01' --> UNPREDICTABLE
2623 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
2624 // return failure here. The '01' imod value is unprintable, so there's
2625 // nothing useful we could do even if we returned UNPREDICTABLE.
2626
2627 if (imod == 1) return MCDisassembler::Fail;
2628
2629 if (imod && M) {
2630 Inst.setOpcode(ARM::t2CPS3p);
2631 Inst.addOperand(MCOperand::createImm(imod));
2632 Inst.addOperand(MCOperand::createImm(iflags));
2633 Inst.addOperand(MCOperand::createImm(mode));
2634 } else if (imod && !M) {
2635 Inst.setOpcode(ARM::t2CPS2p);
2636 Inst.addOperand(MCOperand::createImm(imod));
2637 Inst.addOperand(MCOperand::createImm(iflags));
2638 if (mode) S = MCDisassembler::SoftFail;
2639 } else if (!imod && M) {
2640 Inst.setOpcode(ARM::t2CPS1p);
2641 Inst.addOperand(MCOperand::createImm(mode));
2642 if (iflags) S = MCDisassembler::SoftFail;
2643 } else {
2644 // imod == '00' && M == '0' --> this is a HINT instruction
2645 int imm = fieldFromInstruction(Insn, 0, 8);
2646 // HINT are defined only for immediate in [0..4]
2647 if(imm > 4) return MCDisassembler::Fail;
2648 Inst.setOpcode(ARM::t2HINT);
2649 Inst.addOperand(MCOperand::createImm(imm));
2650 }
2651
2652 return S;
2653 }
2654
2655 static DecodeStatus
DecodeT2HintSpaceInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2656 DecodeT2HintSpaceInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
2657 const MCDisassembler *Decoder) {
2658 unsigned imm = fieldFromInstruction(Insn, 0, 8);
2659
2660 unsigned Opcode = ARM::t2HINT;
2661
2662 if (imm == 0x0D) {
2663 Opcode = ARM::t2PACBTI;
2664 } else if (imm == 0x1D) {
2665 Opcode = ARM::t2PAC;
2666 } else if (imm == 0x2D) {
2667 Opcode = ARM::t2AUT;
2668 } else if (imm == 0x0F) {
2669 Opcode = ARM::t2BTI;
2670 }
2671
2672 Inst.setOpcode(Opcode);
2673 if (Opcode == ARM::t2HINT) {
2674 Inst.addOperand(MCOperand::createImm(imm));
2675 }
2676
2677 return MCDisassembler::Success;
2678 }
2679
DecodeT2MOVTWInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2680 static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
2681 uint64_t Address,
2682 const MCDisassembler *Decoder) {
2683 DecodeStatus S = MCDisassembler::Success;
2684
2685 unsigned Rd = fieldFromInstruction(Insn, 8, 4);
2686 unsigned imm = 0;
2687
2688 imm |= (fieldFromInstruction(Insn, 0, 8) << 0);
2689 imm |= (fieldFromInstruction(Insn, 12, 3) << 8);
2690 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2691 imm |= (fieldFromInstruction(Insn, 26, 1) << 11);
2692
2693 if (Inst.getOpcode() == ARM::t2MOVTi16)
2694 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2695 return MCDisassembler::Fail;
2696 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2697 return MCDisassembler::Fail;
2698
2699 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2700 Inst.addOperand(MCOperand::createImm(imm));
2701
2702 return S;
2703 }
2704
DecodeArmMOVTWInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2705 static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
2706 uint64_t Address,
2707 const MCDisassembler *Decoder) {
2708 DecodeStatus S = MCDisassembler::Success;
2709
2710 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2711 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2712 unsigned imm = 0;
2713
2714 imm |= (fieldFromInstruction(Insn, 0, 12) << 0);
2715 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2716
2717 if (Inst.getOpcode() == ARM::MOVTi16)
2718 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2719 return MCDisassembler::Fail;
2720
2721 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2722 return MCDisassembler::Fail;
2723
2724 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2725 Inst.addOperand(MCOperand::createImm(imm));
2726
2727 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2728 return MCDisassembler::Fail;
2729
2730 return S;
2731 }
2732
DecodeSMLAInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2733 static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
2734 uint64_t Address,
2735 const MCDisassembler *Decoder) {
2736 DecodeStatus S = MCDisassembler::Success;
2737
2738 unsigned Rd = fieldFromInstruction(Insn, 16, 4);
2739 unsigned Rn = fieldFromInstruction(Insn, 0, 4);
2740 unsigned Rm = fieldFromInstruction(Insn, 8, 4);
2741 unsigned Ra = fieldFromInstruction(Insn, 12, 4);
2742 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2743
2744 if (pred == 0xF)
2745 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2746
2747 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2748 return MCDisassembler::Fail;
2749 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2750 return MCDisassembler::Fail;
2751 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2752 return MCDisassembler::Fail;
2753 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder)))
2754 return MCDisassembler::Fail;
2755
2756 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2757 return MCDisassembler::Fail;
2758
2759 return S;
2760 }
2761
DecodeTSTInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2762 static DecodeStatus DecodeTSTInstruction(MCInst &Inst, unsigned Insn,
2763 uint64_t Address,
2764 const MCDisassembler *Decoder) {
2765 DecodeStatus S = MCDisassembler::Success;
2766
2767 unsigned Pred = fieldFromInstruction(Insn, 28, 4);
2768 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2769 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2770
2771 if (Pred == 0xF)
2772 return DecodeSETPANInstruction(Inst, Insn, Address, Decoder);
2773
2774 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2775 return MCDisassembler::Fail;
2776 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2777 return MCDisassembler::Fail;
2778 if (!Check(S, DecodePredicateOperand(Inst, Pred, Address, Decoder)))
2779 return MCDisassembler::Fail;
2780
2781 return S;
2782 }
2783
DecodeSETPANInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2784 static DecodeStatus DecodeSETPANInstruction(MCInst &Inst, unsigned Insn,
2785 uint64_t Address,
2786 const MCDisassembler *Decoder) {
2787 DecodeStatus S = MCDisassembler::Success;
2788
2789 unsigned Imm = fieldFromInstruction(Insn, 9, 1);
2790
2791 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
2792 const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits();
2793
2794 if (!FeatureBits[ARM::HasV8_1aOps] ||
2795 !FeatureBits[ARM::HasV8Ops])
2796 return MCDisassembler::Fail;
2797
2798 // Decoder can be called from DecodeTST, which does not check the full
2799 // encoding is valid.
2800 if (fieldFromInstruction(Insn, 20,12) != 0xf11 ||
2801 fieldFromInstruction(Insn, 4,4) != 0)
2802 return MCDisassembler::Fail;
2803 if (fieldFromInstruction(Insn, 10,10) != 0 ||
2804 fieldFromInstruction(Insn, 0,4) != 0)
2805 S = MCDisassembler::SoftFail;
2806
2807 Inst.setOpcode(ARM::SETPAN);
2808 Inst.addOperand(MCOperand::createImm(Imm));
2809
2810 return S;
2811 }
2812
DecodeAddrModeImm12Operand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)2813 static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
2814 uint64_t Address,
2815 const MCDisassembler *Decoder) {
2816 DecodeStatus S = MCDisassembler::Success;
2817
2818 unsigned add = fieldFromInstruction(Val, 12, 1);
2819 unsigned imm = fieldFromInstruction(Val, 0, 12);
2820 unsigned Rn = fieldFromInstruction(Val, 13, 4);
2821
2822 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2823 return MCDisassembler::Fail;
2824
2825 if (!add) imm *= -1;
2826 if (imm == 0 && !add) imm = INT32_MIN;
2827 Inst.addOperand(MCOperand::createImm(imm));
2828 if (Rn == 15)
2829 tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder);
2830
2831 return S;
2832 }
2833
DecodeAddrMode5Operand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)2834 static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
2835 uint64_t Address,
2836 const MCDisassembler *Decoder) {
2837 DecodeStatus S = MCDisassembler::Success;
2838
2839 unsigned Rn = fieldFromInstruction(Val, 9, 4);
2840 // U == 1 to add imm, 0 to subtract it.
2841 unsigned U = fieldFromInstruction(Val, 8, 1);
2842 unsigned imm = fieldFromInstruction(Val, 0, 8);
2843
2844 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2845 return MCDisassembler::Fail;
2846
2847 if (U)
2848 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::add, imm)));
2849 else
2850 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm)));
2851
2852 return S;
2853 }
2854
DecodeAddrMode5FP16Operand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)2855 static DecodeStatus DecodeAddrMode5FP16Operand(MCInst &Inst, unsigned Val,
2856 uint64_t Address,
2857 const MCDisassembler *Decoder) {
2858 DecodeStatus S = MCDisassembler::Success;
2859
2860 unsigned Rn = fieldFromInstruction(Val, 9, 4);
2861 // U == 1 to add imm, 0 to subtract it.
2862 unsigned U = fieldFromInstruction(Val, 8, 1);
2863 unsigned imm = fieldFromInstruction(Val, 0, 8);
2864
2865 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2866 return MCDisassembler::Fail;
2867
2868 if (U)
2869 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::add, imm)));
2870 else
2871 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::sub, imm)));
2872
2873 return S;
2874 }
2875
DecodeAddrMode7Operand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)2876 static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
2877 uint64_t Address,
2878 const MCDisassembler *Decoder) {
2879 return DecodeGPRRegisterClass(Inst, Val, Address, Decoder);
2880 }
2881
DecodeT2BInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2882 static DecodeStatus DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
2883 uint64_t Address,
2884 const MCDisassembler *Decoder) {
2885 DecodeStatus Status = MCDisassembler::Success;
2886
2887 // Note the J1 and J2 values are from the encoded instruction. So here
2888 // change them to I1 and I2 values via as documented:
2889 // I1 = NOT(J1 EOR S);
2890 // I2 = NOT(J2 EOR S);
2891 // and build the imm32 with one trailing zero as documented:
2892 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
2893 unsigned S = fieldFromInstruction(Insn, 26, 1);
2894 unsigned J1 = fieldFromInstruction(Insn, 13, 1);
2895 unsigned J2 = fieldFromInstruction(Insn, 11, 1);
2896 unsigned I1 = !(J1 ^ S);
2897 unsigned I2 = !(J2 ^ S);
2898 unsigned imm10 = fieldFromInstruction(Insn, 16, 10);
2899 unsigned imm11 = fieldFromInstruction(Insn, 0, 11);
2900 unsigned tmp = (S << 23) | (I1 << 22) | (I2 << 21) | (imm10 << 11) | imm11;
2901 int imm32 = SignExtend32<25>(tmp << 1);
2902 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
2903 true, 4, Inst, Decoder))
2904 Inst.addOperand(MCOperand::createImm(imm32));
2905
2906 return Status;
2907 }
2908
DecodeBranchImmInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2909 static DecodeStatus DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn,
2910 uint64_t Address,
2911 const MCDisassembler *Decoder) {
2912 DecodeStatus S = MCDisassembler::Success;
2913
2914 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2915 unsigned imm = fieldFromInstruction(Insn, 0, 24) << 2;
2916
2917 if (pred == 0xF) {
2918 Inst.setOpcode(ARM::BLXi);
2919 imm |= fieldFromInstruction(Insn, 24, 1) << 1;
2920 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2921 true, 4, Inst, Decoder))
2922 Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm)));
2923 return S;
2924 }
2925
2926 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2927 true, 4, Inst, Decoder))
2928 Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm)));
2929
2930 // We already have BL_pred for BL w/ predicate, no need to add addition
2931 // predicate opreands for BL
2932 if (Inst.getOpcode() != ARM::BL)
2933 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2934 return MCDisassembler::Fail;
2935
2936 return S;
2937 }
2938
DecodeAddrMode6Operand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)2939 static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
2940 uint64_t Address,
2941 const MCDisassembler *Decoder) {
2942 DecodeStatus S = MCDisassembler::Success;
2943
2944 unsigned Rm = fieldFromInstruction(Val, 0, 4);
2945 unsigned align = fieldFromInstruction(Val, 4, 2);
2946
2947 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2948 return MCDisassembler::Fail;
2949 if (!align)
2950 Inst.addOperand(MCOperand::createImm(0));
2951 else
2952 Inst.addOperand(MCOperand::createImm(4 << align));
2953
2954 return S;
2955 }
2956
DecodeVLDInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)2957 static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Insn,
2958 uint64_t Address,
2959 const MCDisassembler *Decoder) {
2960 DecodeStatus S = MCDisassembler::Success;
2961
2962 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2963 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2964 unsigned wb = fieldFromInstruction(Insn, 16, 4);
2965 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2966 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
2967 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2968
2969 // First output register
2970 switch (Inst.getOpcode()) {
2971 case ARM::VLD1q16: case ARM::VLD1q32: case ARM::VLD1q64: case ARM::VLD1q8:
2972 case ARM::VLD1q16wb_fixed: case ARM::VLD1q16wb_register:
2973 case ARM::VLD1q32wb_fixed: case ARM::VLD1q32wb_register:
2974 case ARM::VLD1q64wb_fixed: case ARM::VLD1q64wb_register:
2975 case ARM::VLD1q8wb_fixed: case ARM::VLD1q8wb_register:
2976 case ARM::VLD2d16: case ARM::VLD2d32: case ARM::VLD2d8:
2977 case ARM::VLD2d16wb_fixed: case ARM::VLD2d16wb_register:
2978 case ARM::VLD2d32wb_fixed: case ARM::VLD2d32wb_register:
2979 case ARM::VLD2d8wb_fixed: case ARM::VLD2d8wb_register:
2980 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2981 return MCDisassembler::Fail;
2982 break;
2983 case ARM::VLD2b16:
2984 case ARM::VLD2b32:
2985 case ARM::VLD2b8:
2986 case ARM::VLD2b16wb_fixed:
2987 case ARM::VLD2b16wb_register:
2988 case ARM::VLD2b32wb_fixed:
2989 case ARM::VLD2b32wb_register:
2990 case ARM::VLD2b8wb_fixed:
2991 case ARM::VLD2b8wb_register:
2992 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2993 return MCDisassembler::Fail;
2994 break;
2995 default:
2996 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2997 return MCDisassembler::Fail;
2998 }
2999
3000 // Second output register
3001 switch (Inst.getOpcode()) {
3002 case ARM::VLD3d8:
3003 case ARM::VLD3d16:
3004 case ARM::VLD3d32:
3005 case ARM::VLD3d8_UPD:
3006 case ARM::VLD3d16_UPD:
3007 case ARM::VLD3d32_UPD:
3008 case ARM::VLD4d8:
3009 case ARM::VLD4d16:
3010 case ARM::VLD4d32:
3011 case ARM::VLD4d8_UPD:
3012 case ARM::VLD4d16_UPD:
3013 case ARM::VLD4d32_UPD:
3014 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
3015 return MCDisassembler::Fail;
3016 break;
3017 case ARM::VLD3q8:
3018 case ARM::VLD3q16:
3019 case ARM::VLD3q32:
3020 case ARM::VLD3q8_UPD:
3021 case ARM::VLD3q16_UPD:
3022 case ARM::VLD3q32_UPD:
3023 case ARM::VLD4q8:
3024 case ARM::VLD4q16:
3025 case ARM::VLD4q32:
3026 case ARM::VLD4q8_UPD:
3027 case ARM::VLD4q16_UPD:
3028 case ARM::VLD4q32_UPD:
3029 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3030 return MCDisassembler::Fail;
3031 break;
3032 default:
3033 break;
3034 }
3035
3036 // Third output register
3037 switch(Inst.getOpcode()) {
3038 case ARM::VLD3d8:
3039 case ARM::VLD3d16:
3040 case ARM::VLD3d32:
3041 case ARM::VLD3d8_UPD:
3042 case ARM::VLD3d16_UPD:
3043 case ARM::VLD3d32_UPD:
3044 case ARM::VLD4d8:
3045 case ARM::VLD4d16:
3046 case ARM::VLD4d32:
3047 case ARM::VLD4d8_UPD:
3048 case ARM::VLD4d16_UPD:
3049 case ARM::VLD4d32_UPD:
3050 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3051 return MCDisassembler::Fail;
3052 break;
3053 case ARM::VLD3q8:
3054 case ARM::VLD3q16:
3055 case ARM::VLD3q32:
3056 case ARM::VLD3q8_UPD:
3057 case ARM::VLD3q16_UPD:
3058 case ARM::VLD3q32_UPD:
3059 case ARM::VLD4q8:
3060 case ARM::VLD4q16:
3061 case ARM::VLD4q32:
3062 case ARM::VLD4q8_UPD:
3063 case ARM::VLD4q16_UPD:
3064 case ARM::VLD4q32_UPD:
3065 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
3066 return MCDisassembler::Fail;
3067 break;
3068 default:
3069 break;
3070 }
3071
3072 // Fourth output register
3073 switch (Inst.getOpcode()) {
3074 case ARM::VLD4d8:
3075 case ARM::VLD4d16:
3076 case ARM::VLD4d32:
3077 case ARM::VLD4d8_UPD:
3078 case ARM::VLD4d16_UPD:
3079 case ARM::VLD4d32_UPD:
3080 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
3081 return MCDisassembler::Fail;
3082 break;
3083 case ARM::VLD4q8:
3084 case ARM::VLD4q16:
3085 case ARM::VLD4q32:
3086 case ARM::VLD4q8_UPD:
3087 case ARM::VLD4q16_UPD:
3088 case ARM::VLD4q32_UPD:
3089 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
3090 return MCDisassembler::Fail;
3091 break;
3092 default:
3093 break;
3094 }
3095
3096 // Writeback operand
3097 switch (Inst.getOpcode()) {
3098 case ARM::VLD1d8wb_fixed:
3099 case ARM::VLD1d16wb_fixed:
3100 case ARM::VLD1d32wb_fixed:
3101 case ARM::VLD1d64wb_fixed:
3102 case ARM::VLD1d8wb_register:
3103 case ARM::VLD1d16wb_register:
3104 case ARM::VLD1d32wb_register:
3105 case ARM::VLD1d64wb_register:
3106 case ARM::VLD1q8wb_fixed:
3107 case ARM::VLD1q16wb_fixed:
3108 case ARM::VLD1q32wb_fixed:
3109 case ARM::VLD1q64wb_fixed:
3110 case ARM::VLD1q8wb_register:
3111 case ARM::VLD1q16wb_register:
3112 case ARM::VLD1q32wb_register:
3113 case ARM::VLD1q64wb_register:
3114 case ARM::VLD1d8Twb_fixed:
3115 case ARM::VLD1d8Twb_register:
3116 case ARM::VLD1d16Twb_fixed:
3117 case ARM::VLD1d16Twb_register:
3118 case ARM::VLD1d32Twb_fixed:
3119 case ARM::VLD1d32Twb_register:
3120 case ARM::VLD1d64Twb_fixed:
3121 case ARM::VLD1d64Twb_register:
3122 case ARM::VLD1d8Qwb_fixed:
3123 case ARM::VLD1d8Qwb_register:
3124 case ARM::VLD1d16Qwb_fixed:
3125 case ARM::VLD1d16Qwb_register:
3126 case ARM::VLD1d32Qwb_fixed:
3127 case ARM::VLD1d32Qwb_register:
3128 case ARM::VLD1d64Qwb_fixed:
3129 case ARM::VLD1d64Qwb_register:
3130 case ARM::VLD2d8wb_fixed:
3131 case ARM::VLD2d16wb_fixed:
3132 case ARM::VLD2d32wb_fixed:
3133 case ARM::VLD2q8wb_fixed:
3134 case ARM::VLD2q16wb_fixed:
3135 case ARM::VLD2q32wb_fixed:
3136 case ARM::VLD2d8wb_register:
3137 case ARM::VLD2d16wb_register:
3138 case ARM::VLD2d32wb_register:
3139 case ARM::VLD2q8wb_register:
3140 case ARM::VLD2q16wb_register:
3141 case ARM::VLD2q32wb_register:
3142 case ARM::VLD2b8wb_fixed:
3143 case ARM::VLD2b16wb_fixed:
3144 case ARM::VLD2b32wb_fixed:
3145 case ARM::VLD2b8wb_register:
3146 case ARM::VLD2b16wb_register:
3147 case ARM::VLD2b32wb_register:
3148 Inst.addOperand(MCOperand::createImm(0));
3149 break;
3150 case ARM::VLD3d8_UPD:
3151 case ARM::VLD3d16_UPD:
3152 case ARM::VLD3d32_UPD:
3153 case ARM::VLD3q8_UPD:
3154 case ARM::VLD3q16_UPD:
3155 case ARM::VLD3q32_UPD:
3156 case ARM::VLD4d8_UPD:
3157 case ARM::VLD4d16_UPD:
3158 case ARM::VLD4d32_UPD:
3159 case ARM::VLD4q8_UPD:
3160 case ARM::VLD4q16_UPD:
3161 case ARM::VLD4q32_UPD:
3162 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
3163 return MCDisassembler::Fail;
3164 break;
3165 default:
3166 break;
3167 }
3168
3169 // AddrMode6 Base (register+alignment)
3170 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
3171 return MCDisassembler::Fail;
3172
3173 // AddrMode6 Offset (register)
3174 switch (Inst.getOpcode()) {
3175 default:
3176 // The below have been updated to have explicit am6offset split
3177 // between fixed and register offset. For those instructions not
3178 // yet updated, we need to add an additional reg0 operand for the
3179 // fixed variant.
3180 //
3181 // The fixed offset encodes as Rm == 0xd, so we check for that.
3182 if (Rm == 0xd) {
3183 Inst.addOperand(MCOperand::createReg(0));
3184 break;
3185 }
3186 // Fall through to handle the register offset variant.
3187 [[fallthrough]];
3188 case ARM::VLD1d8wb_fixed:
3189 case ARM::VLD1d16wb_fixed:
3190 case ARM::VLD1d32wb_fixed:
3191 case ARM::VLD1d64wb_fixed:
3192 case ARM::VLD1d8Twb_fixed:
3193 case ARM::VLD1d16Twb_fixed:
3194 case ARM::VLD1d32Twb_fixed:
3195 case ARM::VLD1d64Twb_fixed:
3196 case ARM::VLD1d8Qwb_fixed:
3197 case ARM::VLD1d16Qwb_fixed:
3198 case ARM::VLD1d32Qwb_fixed:
3199 case ARM::VLD1d64Qwb_fixed:
3200 case ARM::VLD1d8wb_register:
3201 case ARM::VLD1d16wb_register:
3202 case ARM::VLD1d32wb_register:
3203 case ARM::VLD1d64wb_register:
3204 case ARM::VLD1q8wb_fixed:
3205 case ARM::VLD1q16wb_fixed:
3206 case ARM::VLD1q32wb_fixed:
3207 case ARM::VLD1q64wb_fixed:
3208 case ARM::VLD1q8wb_register:
3209 case ARM::VLD1q16wb_register:
3210 case ARM::VLD1q32wb_register:
3211 case ARM::VLD1q64wb_register:
3212 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
3213 // variant encodes Rm == 0xf. Anything else is a register offset post-
3214 // increment and we need to add the register operand to the instruction.
3215 if (Rm != 0xD && Rm != 0xF &&
3216 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3217 return MCDisassembler::Fail;
3218 break;
3219 case ARM::VLD2d8wb_fixed:
3220 case ARM::VLD2d16wb_fixed:
3221 case ARM::VLD2d32wb_fixed:
3222 case ARM::VLD2b8wb_fixed:
3223 case ARM::VLD2b16wb_fixed:
3224 case ARM::VLD2b32wb_fixed:
3225 case ARM::VLD2q8wb_fixed:
3226 case ARM::VLD2q16wb_fixed:
3227 case ARM::VLD2q32wb_fixed:
3228 break;
3229 }
3230
3231 return S;
3232 }
3233
DecodeVLDST1Instruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3234 static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Insn,
3235 uint64_t Address,
3236 const MCDisassembler *Decoder) {
3237 unsigned type = fieldFromInstruction(Insn, 8, 4);
3238 unsigned align = fieldFromInstruction(Insn, 4, 2);
3239 if (type == 6 && (align & 2)) return MCDisassembler::Fail;
3240 if (type == 7 && (align & 2)) return MCDisassembler::Fail;
3241 if (type == 10 && align == 3) return MCDisassembler::Fail;
3242
3243 unsigned load = fieldFromInstruction(Insn, 21, 1);
3244 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3245 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3246 }
3247
DecodeVLDST2Instruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3248 static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Insn,
3249 uint64_t Address,
3250 const MCDisassembler *Decoder) {
3251 unsigned size = fieldFromInstruction(Insn, 6, 2);
3252 if (size == 3) return MCDisassembler::Fail;
3253
3254 unsigned type = fieldFromInstruction(Insn, 8, 4);
3255 unsigned align = fieldFromInstruction(Insn, 4, 2);
3256 if (type == 8 && align == 3) return MCDisassembler::Fail;
3257 if (type == 9 && align == 3) return MCDisassembler::Fail;
3258
3259 unsigned load = fieldFromInstruction(Insn, 21, 1);
3260 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3261 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3262 }
3263
DecodeVLDST3Instruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3264 static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Insn,
3265 uint64_t Address,
3266 const MCDisassembler *Decoder) {
3267 unsigned size = fieldFromInstruction(Insn, 6, 2);
3268 if (size == 3) return MCDisassembler::Fail;
3269
3270 unsigned align = fieldFromInstruction(Insn, 4, 2);
3271 if (align & 2) return MCDisassembler::Fail;
3272
3273 unsigned load = fieldFromInstruction(Insn, 21, 1);
3274 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3275 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3276 }
3277
DecodeVLDST4Instruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3278 static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Insn,
3279 uint64_t Address,
3280 const MCDisassembler *Decoder) {
3281 unsigned size = fieldFromInstruction(Insn, 6, 2);
3282 if (size == 3) return MCDisassembler::Fail;
3283
3284 unsigned load = fieldFromInstruction(Insn, 21, 1);
3285 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3286 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3287 }
3288
DecodeVSTInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3289 static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Insn,
3290 uint64_t Address,
3291 const MCDisassembler *Decoder) {
3292 DecodeStatus S = MCDisassembler::Success;
3293
3294 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3295 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3296 unsigned wb = fieldFromInstruction(Insn, 16, 4);
3297 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3298 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
3299 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3300
3301 // Writeback Operand
3302 switch (Inst.getOpcode()) {
3303 case ARM::VST1d8wb_fixed:
3304 case ARM::VST1d16wb_fixed:
3305 case ARM::VST1d32wb_fixed:
3306 case ARM::VST1d64wb_fixed:
3307 case ARM::VST1d8wb_register:
3308 case ARM::VST1d16wb_register:
3309 case ARM::VST1d32wb_register:
3310 case ARM::VST1d64wb_register:
3311 case ARM::VST1q8wb_fixed:
3312 case ARM::VST1q16wb_fixed:
3313 case ARM::VST1q32wb_fixed:
3314 case ARM::VST1q64wb_fixed:
3315 case ARM::VST1q8wb_register:
3316 case ARM::VST1q16wb_register:
3317 case ARM::VST1q32wb_register:
3318 case ARM::VST1q64wb_register:
3319 case ARM::VST1d8Twb_fixed:
3320 case ARM::VST1d16Twb_fixed:
3321 case ARM::VST1d32Twb_fixed:
3322 case ARM::VST1d64Twb_fixed:
3323 case ARM::VST1d8Twb_register:
3324 case ARM::VST1d16Twb_register:
3325 case ARM::VST1d32Twb_register:
3326 case ARM::VST1d64Twb_register:
3327 case ARM::VST1d8Qwb_fixed:
3328 case ARM::VST1d16Qwb_fixed:
3329 case ARM::VST1d32Qwb_fixed:
3330 case ARM::VST1d64Qwb_fixed:
3331 case ARM::VST1d8Qwb_register:
3332 case ARM::VST1d16Qwb_register:
3333 case ARM::VST1d32Qwb_register:
3334 case ARM::VST1d64Qwb_register:
3335 case ARM::VST2d8wb_fixed:
3336 case ARM::VST2d16wb_fixed:
3337 case ARM::VST2d32wb_fixed:
3338 case ARM::VST2d8wb_register:
3339 case ARM::VST2d16wb_register:
3340 case ARM::VST2d32wb_register:
3341 case ARM::VST2q8wb_fixed:
3342 case ARM::VST2q16wb_fixed:
3343 case ARM::VST2q32wb_fixed:
3344 case ARM::VST2q8wb_register:
3345 case ARM::VST2q16wb_register:
3346 case ARM::VST2q32wb_register:
3347 case ARM::VST2b8wb_fixed:
3348 case ARM::VST2b16wb_fixed:
3349 case ARM::VST2b32wb_fixed:
3350 case ARM::VST2b8wb_register:
3351 case ARM::VST2b16wb_register:
3352 case ARM::VST2b32wb_register:
3353 if (Rm == 0xF)
3354 return MCDisassembler::Fail;
3355 Inst.addOperand(MCOperand::createImm(0));
3356 break;
3357 case ARM::VST3d8_UPD:
3358 case ARM::VST3d16_UPD:
3359 case ARM::VST3d32_UPD:
3360 case ARM::VST3q8_UPD:
3361 case ARM::VST3q16_UPD:
3362 case ARM::VST3q32_UPD:
3363 case ARM::VST4d8_UPD:
3364 case ARM::VST4d16_UPD:
3365 case ARM::VST4d32_UPD:
3366 case ARM::VST4q8_UPD:
3367 case ARM::VST4q16_UPD:
3368 case ARM::VST4q32_UPD:
3369 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
3370 return MCDisassembler::Fail;
3371 break;
3372 default:
3373 break;
3374 }
3375
3376 // AddrMode6 Base (register+alignment)
3377 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
3378 return MCDisassembler::Fail;
3379
3380 // AddrMode6 Offset (register)
3381 switch (Inst.getOpcode()) {
3382 default:
3383 if (Rm == 0xD)
3384 Inst.addOperand(MCOperand::createReg(0));
3385 else if (Rm != 0xF) {
3386 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3387 return MCDisassembler::Fail;
3388 }
3389 break;
3390 case ARM::VST1d8wb_fixed:
3391 case ARM::VST1d16wb_fixed:
3392 case ARM::VST1d32wb_fixed:
3393 case ARM::VST1d64wb_fixed:
3394 case ARM::VST1q8wb_fixed:
3395 case ARM::VST1q16wb_fixed:
3396 case ARM::VST1q32wb_fixed:
3397 case ARM::VST1q64wb_fixed:
3398 case ARM::VST1d8Twb_fixed:
3399 case ARM::VST1d16Twb_fixed:
3400 case ARM::VST1d32Twb_fixed:
3401 case ARM::VST1d64Twb_fixed:
3402 case ARM::VST1d8Qwb_fixed:
3403 case ARM::VST1d16Qwb_fixed:
3404 case ARM::VST1d32Qwb_fixed:
3405 case ARM::VST1d64Qwb_fixed:
3406 case ARM::VST2d8wb_fixed:
3407 case ARM::VST2d16wb_fixed:
3408 case ARM::VST2d32wb_fixed:
3409 case ARM::VST2q8wb_fixed:
3410 case ARM::VST2q16wb_fixed:
3411 case ARM::VST2q32wb_fixed:
3412 case ARM::VST2b8wb_fixed:
3413 case ARM::VST2b16wb_fixed:
3414 case ARM::VST2b32wb_fixed:
3415 break;
3416 }
3417
3418 // First input register
3419 switch (Inst.getOpcode()) {
3420 case ARM::VST1q16:
3421 case ARM::VST1q32:
3422 case ARM::VST1q64:
3423 case ARM::VST1q8:
3424 case ARM::VST1q16wb_fixed:
3425 case ARM::VST1q16wb_register:
3426 case ARM::VST1q32wb_fixed:
3427 case ARM::VST1q32wb_register:
3428 case ARM::VST1q64wb_fixed:
3429 case ARM::VST1q64wb_register:
3430 case ARM::VST1q8wb_fixed:
3431 case ARM::VST1q8wb_register:
3432 case ARM::VST2d16:
3433 case ARM::VST2d32:
3434 case ARM::VST2d8:
3435 case ARM::VST2d16wb_fixed:
3436 case ARM::VST2d16wb_register:
3437 case ARM::VST2d32wb_fixed:
3438 case ARM::VST2d32wb_register:
3439 case ARM::VST2d8wb_fixed:
3440 case ARM::VST2d8wb_register:
3441 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3442 return MCDisassembler::Fail;
3443 break;
3444 case ARM::VST2b16:
3445 case ARM::VST2b32:
3446 case ARM::VST2b8:
3447 case ARM::VST2b16wb_fixed:
3448 case ARM::VST2b16wb_register:
3449 case ARM::VST2b32wb_fixed:
3450 case ARM::VST2b32wb_register:
3451 case ARM::VST2b8wb_fixed:
3452 case ARM::VST2b8wb_register:
3453 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
3454 return MCDisassembler::Fail;
3455 break;
3456 default:
3457 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3458 return MCDisassembler::Fail;
3459 }
3460
3461 // Second input register
3462 switch (Inst.getOpcode()) {
3463 case ARM::VST3d8:
3464 case ARM::VST3d16:
3465 case ARM::VST3d32:
3466 case ARM::VST3d8_UPD:
3467 case ARM::VST3d16_UPD:
3468 case ARM::VST3d32_UPD:
3469 case ARM::VST4d8:
3470 case ARM::VST4d16:
3471 case ARM::VST4d32:
3472 case ARM::VST4d8_UPD:
3473 case ARM::VST4d16_UPD:
3474 case ARM::VST4d32_UPD:
3475 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
3476 return MCDisassembler::Fail;
3477 break;
3478 case ARM::VST3q8:
3479 case ARM::VST3q16:
3480 case ARM::VST3q32:
3481 case ARM::VST3q8_UPD:
3482 case ARM::VST3q16_UPD:
3483 case ARM::VST3q32_UPD:
3484 case ARM::VST4q8:
3485 case ARM::VST4q16:
3486 case ARM::VST4q32:
3487 case ARM::VST4q8_UPD:
3488 case ARM::VST4q16_UPD:
3489 case ARM::VST4q32_UPD:
3490 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3491 return MCDisassembler::Fail;
3492 break;
3493 default:
3494 break;
3495 }
3496
3497 // Third input register
3498 switch (Inst.getOpcode()) {
3499 case ARM::VST3d8:
3500 case ARM::VST3d16:
3501 case ARM::VST3d32:
3502 case ARM::VST3d8_UPD:
3503 case ARM::VST3d16_UPD:
3504 case ARM::VST3d32_UPD:
3505 case ARM::VST4d8:
3506 case ARM::VST4d16:
3507 case ARM::VST4d32:
3508 case ARM::VST4d8_UPD:
3509 case ARM::VST4d16_UPD:
3510 case ARM::VST4d32_UPD:
3511 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3512 return MCDisassembler::Fail;
3513 break;
3514 case ARM::VST3q8:
3515 case ARM::VST3q16:
3516 case ARM::VST3q32:
3517 case ARM::VST3q8_UPD:
3518 case ARM::VST3q16_UPD:
3519 case ARM::VST3q32_UPD:
3520 case ARM::VST4q8:
3521 case ARM::VST4q16:
3522 case ARM::VST4q32:
3523 case ARM::VST4q8_UPD:
3524 case ARM::VST4q16_UPD:
3525 case ARM::VST4q32_UPD:
3526 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
3527 return MCDisassembler::Fail;
3528 break;
3529 default:
3530 break;
3531 }
3532
3533 // Fourth input register
3534 switch (Inst.getOpcode()) {
3535 case ARM::VST4d8:
3536 case ARM::VST4d16:
3537 case ARM::VST4d32:
3538 case ARM::VST4d8_UPD:
3539 case ARM::VST4d16_UPD:
3540 case ARM::VST4d32_UPD:
3541 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
3542 return MCDisassembler::Fail;
3543 break;
3544 case ARM::VST4q8:
3545 case ARM::VST4q16:
3546 case ARM::VST4q32:
3547 case ARM::VST4q8_UPD:
3548 case ARM::VST4q16_UPD:
3549 case ARM::VST4q32_UPD:
3550 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
3551 return MCDisassembler::Fail;
3552 break;
3553 default:
3554 break;
3555 }
3556
3557 return S;
3558 }
3559
DecodeVLD1DupInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3560 static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Insn,
3561 uint64_t Address,
3562 const MCDisassembler *Decoder) {
3563 DecodeStatus S = MCDisassembler::Success;
3564
3565 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3566 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3567 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3568 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3569 unsigned align = fieldFromInstruction(Insn, 4, 1);
3570 unsigned size = fieldFromInstruction(Insn, 6, 2);
3571
3572 if (size == 0 && align == 1)
3573 return MCDisassembler::Fail;
3574 align *= (1 << size);
3575
3576 switch (Inst.getOpcode()) {
3577 case ARM::VLD1DUPq16: case ARM::VLD1DUPq32: case ARM::VLD1DUPq8:
3578 case ARM::VLD1DUPq16wb_fixed: case ARM::VLD1DUPq16wb_register:
3579 case ARM::VLD1DUPq32wb_fixed: case ARM::VLD1DUPq32wb_register:
3580 case ARM::VLD1DUPq8wb_fixed: case ARM::VLD1DUPq8wb_register:
3581 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3582 return MCDisassembler::Fail;
3583 break;
3584 default:
3585 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3586 return MCDisassembler::Fail;
3587 break;
3588 }
3589 if (Rm != 0xF) {
3590 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3591 return MCDisassembler::Fail;
3592 }
3593
3594 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3595 return MCDisassembler::Fail;
3596 Inst.addOperand(MCOperand::createImm(align));
3597
3598 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
3599 // variant encodes Rm == 0xf. Anything else is a register offset post-
3600 // increment and we need to add the register operand to the instruction.
3601 if (Rm != 0xD && Rm != 0xF &&
3602 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3603 return MCDisassembler::Fail;
3604
3605 return S;
3606 }
3607
DecodeVLD2DupInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3608 static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Insn,
3609 uint64_t Address,
3610 const MCDisassembler *Decoder) {
3611 DecodeStatus S = MCDisassembler::Success;
3612
3613 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3614 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3615 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3616 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3617 unsigned align = fieldFromInstruction(Insn, 4, 1);
3618 unsigned size = 1 << fieldFromInstruction(Insn, 6, 2);
3619 align *= 2*size;
3620
3621 switch (Inst.getOpcode()) {
3622 case ARM::VLD2DUPd16: case ARM::VLD2DUPd32: case ARM::VLD2DUPd8:
3623 case ARM::VLD2DUPd16wb_fixed: case ARM::VLD2DUPd16wb_register:
3624 case ARM::VLD2DUPd32wb_fixed: case ARM::VLD2DUPd32wb_register:
3625 case ARM::VLD2DUPd8wb_fixed: case ARM::VLD2DUPd8wb_register:
3626 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3627 return MCDisassembler::Fail;
3628 break;
3629 case ARM::VLD2DUPd16x2: case ARM::VLD2DUPd32x2: case ARM::VLD2DUPd8x2:
3630 case ARM::VLD2DUPd16x2wb_fixed: case ARM::VLD2DUPd16x2wb_register:
3631 case ARM::VLD2DUPd32x2wb_fixed: case ARM::VLD2DUPd32x2wb_register:
3632 case ARM::VLD2DUPd8x2wb_fixed: case ARM::VLD2DUPd8x2wb_register:
3633 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
3634 return MCDisassembler::Fail;
3635 break;
3636 default:
3637 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3638 return MCDisassembler::Fail;
3639 break;
3640 }
3641
3642 if (Rm != 0xF)
3643 Inst.addOperand(MCOperand::createImm(0));
3644
3645 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3646 return MCDisassembler::Fail;
3647 Inst.addOperand(MCOperand::createImm(align));
3648
3649 if (Rm != 0xD && Rm != 0xF) {
3650 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3651 return MCDisassembler::Fail;
3652 }
3653
3654 return S;
3655 }
3656
DecodeVLD3DupInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3657 static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Insn,
3658 uint64_t Address,
3659 const MCDisassembler *Decoder) {
3660 DecodeStatus S = MCDisassembler::Success;
3661
3662 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3663 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3664 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3665 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3666 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
3667
3668 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3669 return MCDisassembler::Fail;
3670 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
3671 return MCDisassembler::Fail;
3672 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
3673 return MCDisassembler::Fail;
3674 if (Rm != 0xF) {
3675 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3676 return MCDisassembler::Fail;
3677 }
3678
3679 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3680 return MCDisassembler::Fail;
3681 Inst.addOperand(MCOperand::createImm(0));
3682
3683 if (Rm == 0xD)
3684 Inst.addOperand(MCOperand::createReg(0));
3685 else if (Rm != 0xF) {
3686 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3687 return MCDisassembler::Fail;
3688 }
3689
3690 return S;
3691 }
3692
DecodeVLD4DupInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3693 static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Insn,
3694 uint64_t Address,
3695 const MCDisassembler *Decoder) {
3696 DecodeStatus S = MCDisassembler::Success;
3697
3698 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3699 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3700 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3701 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3702 unsigned size = fieldFromInstruction(Insn, 6, 2);
3703 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
3704 unsigned align = fieldFromInstruction(Insn, 4, 1);
3705
3706 if (size == 0x3) {
3707 if (align == 0)
3708 return MCDisassembler::Fail;
3709 align = 16;
3710 } else {
3711 if (size == 2) {
3712 align *= 8;
3713 } else {
3714 size = 1 << size;
3715 align *= 4*size;
3716 }
3717 }
3718
3719 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3720 return MCDisassembler::Fail;
3721 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
3722 return MCDisassembler::Fail;
3723 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
3724 return MCDisassembler::Fail;
3725 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder)))
3726 return MCDisassembler::Fail;
3727 if (Rm != 0xF) {
3728 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3729 return MCDisassembler::Fail;
3730 }
3731
3732 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3733 return MCDisassembler::Fail;
3734 Inst.addOperand(MCOperand::createImm(align));
3735
3736 if (Rm == 0xD)
3737 Inst.addOperand(MCOperand::createReg(0));
3738 else if (Rm != 0xF) {
3739 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3740 return MCDisassembler::Fail;
3741 }
3742
3743 return S;
3744 }
3745
DecodeVMOVModImmInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3746 static DecodeStatus DecodeVMOVModImmInstruction(MCInst &Inst, unsigned Insn,
3747 uint64_t Address,
3748 const MCDisassembler *Decoder) {
3749 DecodeStatus S = MCDisassembler::Success;
3750
3751 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3752 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3753 unsigned imm = fieldFromInstruction(Insn, 0, 4);
3754 imm |= fieldFromInstruction(Insn, 16, 3) << 4;
3755 imm |= fieldFromInstruction(Insn, 24, 1) << 7;
3756 imm |= fieldFromInstruction(Insn, 8, 4) << 8;
3757 imm |= fieldFromInstruction(Insn, 5, 1) << 12;
3758 unsigned Q = fieldFromInstruction(Insn, 6, 1);
3759
3760 if (Q) {
3761 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3762 return MCDisassembler::Fail;
3763 } else {
3764 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3765 return MCDisassembler::Fail;
3766 }
3767
3768 Inst.addOperand(MCOperand::createImm(imm));
3769
3770 switch (Inst.getOpcode()) {
3771 case ARM::VORRiv4i16:
3772 case ARM::VORRiv2i32:
3773 case ARM::VBICiv4i16:
3774 case ARM::VBICiv2i32:
3775 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3776 return MCDisassembler::Fail;
3777 break;
3778 case ARM::VORRiv8i16:
3779 case ARM::VORRiv4i32:
3780 case ARM::VBICiv8i16:
3781 case ARM::VBICiv4i32:
3782 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3783 return MCDisassembler::Fail;
3784 break;
3785 default:
3786 break;
3787 }
3788
3789 return S;
3790 }
3791
DecodeMVEModImmInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3792 static DecodeStatus DecodeMVEModImmInstruction(MCInst &Inst, unsigned Insn,
3793 uint64_t Address,
3794 const MCDisassembler *Decoder) {
3795 DecodeStatus S = MCDisassembler::Success;
3796
3797 unsigned Qd = ((fieldFromInstruction(Insn, 22, 1) << 3) |
3798 fieldFromInstruction(Insn, 13, 3));
3799 unsigned cmode = fieldFromInstruction(Insn, 8, 4);
3800 unsigned imm = fieldFromInstruction(Insn, 0, 4);
3801 imm |= fieldFromInstruction(Insn, 16, 3) << 4;
3802 imm |= fieldFromInstruction(Insn, 28, 1) << 7;
3803 imm |= cmode << 8;
3804 imm |= fieldFromInstruction(Insn, 5, 1) << 12;
3805
3806 if (cmode == 0xF && Inst.getOpcode() == ARM::MVE_VMVNimmi32)
3807 return MCDisassembler::Fail;
3808
3809 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
3810 return MCDisassembler::Fail;
3811
3812 Inst.addOperand(MCOperand::createImm(imm));
3813
3814 Inst.addOperand(MCOperand::createImm(ARMVCC::None));
3815 Inst.addOperand(MCOperand::createReg(0));
3816 Inst.addOperand(MCOperand::createImm(0));
3817
3818 return S;
3819 }
3820
DecodeMVEVADCInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3821 static DecodeStatus DecodeMVEVADCInstruction(MCInst &Inst, unsigned Insn,
3822 uint64_t Address,
3823 const MCDisassembler *Decoder) {
3824 DecodeStatus S = MCDisassembler::Success;
3825
3826 unsigned Qd = fieldFromInstruction(Insn, 13, 3);
3827 Qd |= fieldFromInstruction(Insn, 22, 1) << 3;
3828 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
3829 return MCDisassembler::Fail;
3830 Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
3831
3832 unsigned Qn = fieldFromInstruction(Insn, 17, 3);
3833 Qn |= fieldFromInstruction(Insn, 7, 1) << 3;
3834 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qn, Address, Decoder)))
3835 return MCDisassembler::Fail;
3836 unsigned Qm = fieldFromInstruction(Insn, 1, 3);
3837 Qm |= fieldFromInstruction(Insn, 5, 1) << 3;
3838 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
3839 return MCDisassembler::Fail;
3840 if (!fieldFromInstruction(Insn, 12, 1)) // I bit clear => need input FPSCR
3841 Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
3842 Inst.addOperand(MCOperand::createImm(Qd));
3843
3844 return S;
3845 }
3846
DecodeVSHLMaxInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3847 static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Insn,
3848 uint64_t Address,
3849 const MCDisassembler *Decoder) {
3850 DecodeStatus S = MCDisassembler::Success;
3851
3852 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3853 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3854 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3855 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3856 unsigned size = fieldFromInstruction(Insn, 18, 2);
3857
3858 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3859 return MCDisassembler::Fail;
3860 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3861 return MCDisassembler::Fail;
3862 Inst.addOperand(MCOperand::createImm(8 << size));
3863
3864 return S;
3865 }
3866
DecodeShiftRight8Imm(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)3867 static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
3868 uint64_t Address,
3869 const MCDisassembler *Decoder) {
3870 Inst.addOperand(MCOperand::createImm(8 - Val));
3871 return MCDisassembler::Success;
3872 }
3873
DecodeShiftRight16Imm(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)3874 static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
3875 uint64_t Address,
3876 const MCDisassembler *Decoder) {
3877 Inst.addOperand(MCOperand::createImm(16 - Val));
3878 return MCDisassembler::Success;
3879 }
3880
DecodeShiftRight32Imm(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)3881 static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
3882 uint64_t Address,
3883 const MCDisassembler *Decoder) {
3884 Inst.addOperand(MCOperand::createImm(32 - Val));
3885 return MCDisassembler::Success;
3886 }
3887
DecodeShiftRight64Imm(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)3888 static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
3889 uint64_t Address,
3890 const MCDisassembler *Decoder) {
3891 Inst.addOperand(MCOperand::createImm(64 - Val));
3892 return MCDisassembler::Success;
3893 }
3894
DecodeTBLInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)3895 static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
3896 uint64_t Address,
3897 const MCDisassembler *Decoder) {
3898 DecodeStatus S = MCDisassembler::Success;
3899
3900 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3901 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3902 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3903 Rn |= fieldFromInstruction(Insn, 7, 1) << 4;
3904 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3905 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3906 unsigned op = fieldFromInstruction(Insn, 6, 1);
3907
3908 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3909 return MCDisassembler::Fail;
3910 if (op) {
3911 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3912 return MCDisassembler::Fail; // Writeback
3913 }
3914
3915 switch (Inst.getOpcode()) {
3916 case ARM::VTBL2:
3917 case ARM::VTBX2:
3918 if (!Check(S, DecodeDPairRegisterClass(Inst, Rn, Address, Decoder)))
3919 return MCDisassembler::Fail;
3920 break;
3921 default:
3922 if (!Check(S, DecodeDPRRegisterClass(Inst, Rn, Address, Decoder)))
3923 return MCDisassembler::Fail;
3924 }
3925
3926 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3927 return MCDisassembler::Fail;
3928
3929 return S;
3930 }
3931
DecodeThumbAddSpecialReg(MCInst & Inst,uint16_t Insn,uint64_t Address,const MCDisassembler * Decoder)3932 static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
3933 uint64_t Address,
3934 const MCDisassembler *Decoder) {
3935 DecodeStatus S = MCDisassembler::Success;
3936
3937 unsigned dst = fieldFromInstruction(Insn, 8, 3);
3938 unsigned imm = fieldFromInstruction(Insn, 0, 8);
3939
3940 if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder)))
3941 return MCDisassembler::Fail;
3942
3943 switch(Inst.getOpcode()) {
3944 default:
3945 return MCDisassembler::Fail;
3946 case ARM::tADR:
3947 break; // tADR does not explicitly represent the PC as an operand.
3948 case ARM::tADDrSPi:
3949 Inst.addOperand(MCOperand::createReg(ARM::SP));
3950 break;
3951 }
3952
3953 Inst.addOperand(MCOperand::createImm(imm));
3954 return S;
3955 }
3956
DecodeThumbBROperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)3957 static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
3958 uint64_t Address,
3959 const MCDisassembler *Decoder) {
3960 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<12>(Val<<1) + 4,
3961 true, 2, Inst, Decoder))
3962 Inst.addOperand(MCOperand::createImm(SignExtend32<12>(Val << 1)));
3963 return MCDisassembler::Success;
3964 }
3965
DecodeT2BROperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)3966 static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
3967 uint64_t Address,
3968 const MCDisassembler *Decoder) {
3969 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<21>(Val) + 4,
3970 true, 4, Inst, Decoder))
3971 Inst.addOperand(MCOperand::createImm(SignExtend32<21>(Val)));
3972 return MCDisassembler::Success;
3973 }
3974
DecodeThumbCmpBROperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)3975 static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
3976 uint64_t Address,
3977 const MCDisassembler *Decoder) {
3978 if (!tryAddingSymbolicOperand(Address, Address + (Val<<1) + 4,
3979 true, 2, Inst, Decoder))
3980 Inst.addOperand(MCOperand::createImm(Val << 1));
3981 return MCDisassembler::Success;
3982 }
3983
DecodeThumbAddrModeRR(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)3984 static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
3985 uint64_t Address,
3986 const MCDisassembler *Decoder) {
3987 DecodeStatus S = MCDisassembler::Success;
3988
3989 unsigned Rn = fieldFromInstruction(Val, 0, 3);
3990 unsigned Rm = fieldFromInstruction(Val, 3, 3);
3991
3992 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
3993 return MCDisassembler::Fail;
3994 if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder)))
3995 return MCDisassembler::Fail;
3996
3997 return S;
3998 }
3999
DecodeThumbAddrModeIS(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4000 static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
4001 uint64_t Address,
4002 const MCDisassembler *Decoder) {
4003 DecodeStatus S = MCDisassembler::Success;
4004
4005 unsigned Rn = fieldFromInstruction(Val, 0, 3);
4006 unsigned imm = fieldFromInstruction(Val, 3, 5);
4007
4008 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
4009 return MCDisassembler::Fail;
4010 Inst.addOperand(MCOperand::createImm(imm));
4011
4012 return S;
4013 }
4014
DecodeThumbAddrModePC(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4015 static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
4016 uint64_t Address,
4017 const MCDisassembler *Decoder) {
4018 unsigned imm = Val << 2;
4019
4020 Inst.addOperand(MCOperand::createImm(imm));
4021 tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder);
4022
4023 return MCDisassembler::Success;
4024 }
4025
DecodeThumbAddrModeSP(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4026 static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
4027 uint64_t Address,
4028 const MCDisassembler *Decoder) {
4029 Inst.addOperand(MCOperand::createReg(ARM::SP));
4030 Inst.addOperand(MCOperand::createImm(Val));
4031
4032 return MCDisassembler::Success;
4033 }
4034
DecodeT2AddrModeSOReg(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4035 static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
4036 uint64_t Address,
4037 const MCDisassembler *Decoder) {
4038 DecodeStatus S = MCDisassembler::Success;
4039
4040 unsigned Rn = fieldFromInstruction(Val, 6, 4);
4041 unsigned Rm = fieldFromInstruction(Val, 2, 4);
4042 unsigned imm = fieldFromInstruction(Val, 0, 2);
4043
4044 // Thumb stores cannot use PC as dest register.
4045 switch (Inst.getOpcode()) {
4046 case ARM::t2STRHs:
4047 case ARM::t2STRBs:
4048 case ARM::t2STRs:
4049 if (Rn == 15)
4050 return MCDisassembler::Fail;
4051 break;
4052 default:
4053 break;
4054 }
4055
4056 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4057 return MCDisassembler::Fail;
4058 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
4059 return MCDisassembler::Fail;
4060 Inst.addOperand(MCOperand::createImm(imm));
4061
4062 return S;
4063 }
4064
DecodeT2LoadShift(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4065 static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Insn,
4066 uint64_t Address,
4067 const MCDisassembler *Decoder) {
4068 DecodeStatus S = MCDisassembler::Success;
4069
4070 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4071 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4072
4073 const FeatureBitset &featureBits =
4074 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4075
4076 bool hasMP = featureBits[ARM::FeatureMP];
4077 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4078
4079 if (Rn == 15) {
4080 switch (Inst.getOpcode()) {
4081 case ARM::t2LDRBs:
4082 Inst.setOpcode(ARM::t2LDRBpci);
4083 break;
4084 case ARM::t2LDRHs:
4085 Inst.setOpcode(ARM::t2LDRHpci);
4086 break;
4087 case ARM::t2LDRSHs:
4088 Inst.setOpcode(ARM::t2LDRSHpci);
4089 break;
4090 case ARM::t2LDRSBs:
4091 Inst.setOpcode(ARM::t2LDRSBpci);
4092 break;
4093 case ARM::t2LDRs:
4094 Inst.setOpcode(ARM::t2LDRpci);
4095 break;
4096 case ARM::t2PLDs:
4097 Inst.setOpcode(ARM::t2PLDpci);
4098 break;
4099 case ARM::t2PLIs:
4100 Inst.setOpcode(ARM::t2PLIpci);
4101 break;
4102 default:
4103 return MCDisassembler::Fail;
4104 }
4105
4106 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4107 }
4108
4109 if (Rt == 15) {
4110 switch (Inst.getOpcode()) {
4111 case ARM::t2LDRSHs:
4112 return MCDisassembler::Fail;
4113 case ARM::t2LDRHs:
4114 Inst.setOpcode(ARM::t2PLDWs);
4115 break;
4116 case ARM::t2LDRSBs:
4117 Inst.setOpcode(ARM::t2PLIs);
4118 break;
4119 default:
4120 break;
4121 }
4122 }
4123
4124 switch (Inst.getOpcode()) {
4125 case ARM::t2PLDs:
4126 break;
4127 case ARM::t2PLIs:
4128 if (!hasV7Ops)
4129 return MCDisassembler::Fail;
4130 break;
4131 case ARM::t2PLDWs:
4132 if (!hasV7Ops || !hasMP)
4133 return MCDisassembler::Fail;
4134 break;
4135 default:
4136 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4137 return MCDisassembler::Fail;
4138 }
4139
4140 unsigned addrmode = fieldFromInstruction(Insn, 4, 2);
4141 addrmode |= fieldFromInstruction(Insn, 0, 4) << 2;
4142 addrmode |= fieldFromInstruction(Insn, 16, 4) << 6;
4143 if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder)))
4144 return MCDisassembler::Fail;
4145
4146 return S;
4147 }
4148
DecodeT2LoadImm8(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4149 static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
4150 uint64_t Address,
4151 const MCDisassembler *Decoder) {
4152 DecodeStatus S = MCDisassembler::Success;
4153
4154 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4155 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4156 unsigned U = fieldFromInstruction(Insn, 9, 1);
4157 unsigned imm = fieldFromInstruction(Insn, 0, 8);
4158 imm |= (U << 8);
4159 imm |= (Rn << 9);
4160 unsigned add = fieldFromInstruction(Insn, 9, 1);
4161
4162 const FeatureBitset &featureBits =
4163 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4164
4165 bool hasMP = featureBits[ARM::FeatureMP];
4166 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4167
4168 if (Rn == 15) {
4169 switch (Inst.getOpcode()) {
4170 case ARM::t2LDRi8:
4171 Inst.setOpcode(ARM::t2LDRpci);
4172 break;
4173 case ARM::t2LDRBi8:
4174 Inst.setOpcode(ARM::t2LDRBpci);
4175 break;
4176 case ARM::t2LDRSBi8:
4177 Inst.setOpcode(ARM::t2LDRSBpci);
4178 break;
4179 case ARM::t2LDRHi8:
4180 Inst.setOpcode(ARM::t2LDRHpci);
4181 break;
4182 case ARM::t2LDRSHi8:
4183 Inst.setOpcode(ARM::t2LDRSHpci);
4184 break;
4185 case ARM::t2PLDi8:
4186 Inst.setOpcode(ARM::t2PLDpci);
4187 break;
4188 case ARM::t2PLIi8:
4189 Inst.setOpcode(ARM::t2PLIpci);
4190 break;
4191 default:
4192 return MCDisassembler::Fail;
4193 }
4194 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4195 }
4196
4197 if (Rt == 15) {
4198 switch (Inst.getOpcode()) {
4199 case ARM::t2LDRSHi8:
4200 return MCDisassembler::Fail;
4201 case ARM::t2LDRHi8:
4202 if (!add)
4203 Inst.setOpcode(ARM::t2PLDWi8);
4204 break;
4205 case ARM::t2LDRSBi8:
4206 Inst.setOpcode(ARM::t2PLIi8);
4207 break;
4208 default:
4209 break;
4210 }
4211 }
4212
4213 switch (Inst.getOpcode()) {
4214 case ARM::t2PLDi8:
4215 break;
4216 case ARM::t2PLIi8:
4217 if (!hasV7Ops)
4218 return MCDisassembler::Fail;
4219 break;
4220 case ARM::t2PLDWi8:
4221 if (!hasV7Ops || !hasMP)
4222 return MCDisassembler::Fail;
4223 break;
4224 default:
4225 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4226 return MCDisassembler::Fail;
4227 }
4228
4229 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
4230 return MCDisassembler::Fail;
4231 return S;
4232 }
4233
DecodeT2LoadImm12(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4234 static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
4235 uint64_t Address,
4236 const MCDisassembler *Decoder) {
4237 DecodeStatus S = MCDisassembler::Success;
4238
4239 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4240 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4241 unsigned imm = fieldFromInstruction(Insn, 0, 12);
4242 imm |= (Rn << 13);
4243
4244 const FeatureBitset &featureBits =
4245 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4246
4247 bool hasMP = featureBits[ARM::FeatureMP];
4248 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4249
4250 if (Rn == 15) {
4251 switch (Inst.getOpcode()) {
4252 case ARM::t2LDRi12:
4253 Inst.setOpcode(ARM::t2LDRpci);
4254 break;
4255 case ARM::t2LDRHi12:
4256 Inst.setOpcode(ARM::t2LDRHpci);
4257 break;
4258 case ARM::t2LDRSHi12:
4259 Inst.setOpcode(ARM::t2LDRSHpci);
4260 break;
4261 case ARM::t2LDRBi12:
4262 Inst.setOpcode(ARM::t2LDRBpci);
4263 break;
4264 case ARM::t2LDRSBi12:
4265 Inst.setOpcode(ARM::t2LDRSBpci);
4266 break;
4267 case ARM::t2PLDi12:
4268 Inst.setOpcode(ARM::t2PLDpci);
4269 break;
4270 case ARM::t2PLIi12:
4271 Inst.setOpcode(ARM::t2PLIpci);
4272 break;
4273 default:
4274 return MCDisassembler::Fail;
4275 }
4276 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4277 }
4278
4279 if (Rt == 15) {
4280 switch (Inst.getOpcode()) {
4281 case ARM::t2LDRSHi12:
4282 return MCDisassembler::Fail;
4283 case ARM::t2LDRHi12:
4284 Inst.setOpcode(ARM::t2PLDWi12);
4285 break;
4286 case ARM::t2LDRSBi12:
4287 Inst.setOpcode(ARM::t2PLIi12);
4288 break;
4289 default:
4290 break;
4291 }
4292 }
4293
4294 switch (Inst.getOpcode()) {
4295 case ARM::t2PLDi12:
4296 break;
4297 case ARM::t2PLIi12:
4298 if (!hasV7Ops)
4299 return MCDisassembler::Fail;
4300 break;
4301 case ARM::t2PLDWi12:
4302 if (!hasV7Ops || !hasMP)
4303 return MCDisassembler::Fail;
4304 break;
4305 default:
4306 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4307 return MCDisassembler::Fail;
4308 }
4309
4310 if (!Check(S, DecodeT2AddrModeImm12(Inst, imm, Address, Decoder)))
4311 return MCDisassembler::Fail;
4312 return S;
4313 }
4314
DecodeT2LoadT(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4315 static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn, uint64_t Address,
4316 const MCDisassembler *Decoder) {
4317 DecodeStatus S = MCDisassembler::Success;
4318
4319 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4320 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4321 unsigned imm = fieldFromInstruction(Insn, 0, 8);
4322 imm |= (Rn << 9);
4323
4324 if (Rn == 15) {
4325 switch (Inst.getOpcode()) {
4326 case ARM::t2LDRT:
4327 Inst.setOpcode(ARM::t2LDRpci);
4328 break;
4329 case ARM::t2LDRBT:
4330 Inst.setOpcode(ARM::t2LDRBpci);
4331 break;
4332 case ARM::t2LDRHT:
4333 Inst.setOpcode(ARM::t2LDRHpci);
4334 break;
4335 case ARM::t2LDRSBT:
4336 Inst.setOpcode(ARM::t2LDRSBpci);
4337 break;
4338 case ARM::t2LDRSHT:
4339 Inst.setOpcode(ARM::t2LDRSHpci);
4340 break;
4341 default:
4342 return MCDisassembler::Fail;
4343 }
4344 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4345 }
4346
4347 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
4348 return MCDisassembler::Fail;
4349 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
4350 return MCDisassembler::Fail;
4351 return S;
4352 }
4353
DecodeT2LoadLabel(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4354 static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
4355 uint64_t Address,
4356 const MCDisassembler *Decoder) {
4357 DecodeStatus S = MCDisassembler::Success;
4358
4359 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4360 unsigned U = fieldFromInstruction(Insn, 23, 1);
4361 int imm = fieldFromInstruction(Insn, 0, 12);
4362
4363 const FeatureBitset &featureBits =
4364 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4365
4366 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4367
4368 if (Rt == 15) {
4369 switch (Inst.getOpcode()) {
4370 case ARM::t2LDRBpci:
4371 case ARM::t2LDRHpci:
4372 Inst.setOpcode(ARM::t2PLDpci);
4373 break;
4374 case ARM::t2LDRSBpci:
4375 Inst.setOpcode(ARM::t2PLIpci);
4376 break;
4377 case ARM::t2LDRSHpci:
4378 return MCDisassembler::Fail;
4379 default:
4380 break;
4381 }
4382 }
4383
4384 switch(Inst.getOpcode()) {
4385 case ARM::t2PLDpci:
4386 break;
4387 case ARM::t2PLIpci:
4388 if (!hasV7Ops)
4389 return MCDisassembler::Fail;
4390 break;
4391 default:
4392 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4393 return MCDisassembler::Fail;
4394 }
4395
4396 if (!U) {
4397 // Special case for #-0.
4398 if (imm == 0)
4399 imm = INT32_MIN;
4400 else
4401 imm = -imm;
4402 }
4403 Inst.addOperand(MCOperand::createImm(imm));
4404
4405 return S;
4406 }
4407
DecodeT2Imm8S4(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4408 static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val, uint64_t Address,
4409 const MCDisassembler *Decoder) {
4410 if (Val == 0)
4411 Inst.addOperand(MCOperand::createImm(INT32_MIN));
4412 else {
4413 int imm = Val & 0xFF;
4414
4415 if (!(Val & 0x100)) imm *= -1;
4416 Inst.addOperand(MCOperand::createImm(imm * 4));
4417 }
4418
4419 return MCDisassembler::Success;
4420 }
4421
DecodeT2Imm7S4(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4422 static DecodeStatus DecodeT2Imm7S4(MCInst &Inst, unsigned Val, uint64_t Address,
4423 const MCDisassembler *Decoder) {
4424 if (Val == 0)
4425 Inst.addOperand(MCOperand::createImm(INT32_MIN));
4426 else {
4427 int imm = Val & 0x7F;
4428
4429 if (!(Val & 0x80))
4430 imm *= -1;
4431 Inst.addOperand(MCOperand::createImm(imm * 4));
4432 }
4433
4434 return MCDisassembler::Success;
4435 }
4436
DecodeT2AddrModeImm8s4(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4437 static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
4438 uint64_t Address,
4439 const MCDisassembler *Decoder) {
4440 DecodeStatus S = MCDisassembler::Success;
4441
4442 unsigned Rn = fieldFromInstruction(Val, 9, 4);
4443 unsigned imm = fieldFromInstruction(Val, 0, 9);
4444
4445 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4446 return MCDisassembler::Fail;
4447 if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder)))
4448 return MCDisassembler::Fail;
4449
4450 return S;
4451 }
4452
DecodeT2AddrModeImm7s4(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4453 static DecodeStatus DecodeT2AddrModeImm7s4(MCInst &Inst, unsigned Val,
4454 uint64_t Address,
4455 const MCDisassembler *Decoder) {
4456 DecodeStatus S = MCDisassembler::Success;
4457
4458 unsigned Rn = fieldFromInstruction(Val, 8, 4);
4459 unsigned imm = fieldFromInstruction(Val, 0, 8);
4460
4461 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4462 return MCDisassembler::Fail;
4463 if (!Check(S, DecodeT2Imm7S4(Inst, imm, Address, Decoder)))
4464 return MCDisassembler::Fail;
4465
4466 return S;
4467 }
4468
DecodeT2AddrModeImm0_1020s4(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4469 static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst, unsigned Val,
4470 uint64_t Address,
4471 const MCDisassembler *Decoder) {
4472 DecodeStatus S = MCDisassembler::Success;
4473
4474 unsigned Rn = fieldFromInstruction(Val, 8, 4);
4475 unsigned imm = fieldFromInstruction(Val, 0, 8);
4476
4477 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4478 return MCDisassembler::Fail;
4479
4480 Inst.addOperand(MCOperand::createImm(imm));
4481
4482 return S;
4483 }
4484
DecodeT2Imm8(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4485 static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val, uint64_t Address,
4486 const MCDisassembler *Decoder) {
4487 int imm = Val & 0xFF;
4488 if (Val == 0)
4489 imm = INT32_MIN;
4490 else if (!(Val & 0x100))
4491 imm *= -1;
4492 Inst.addOperand(MCOperand::createImm(imm));
4493
4494 return MCDisassembler::Success;
4495 }
4496
4497 template <int shift>
DecodeT2Imm7(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4498 static DecodeStatus DecodeT2Imm7(MCInst &Inst, unsigned Val, uint64_t Address,
4499 const MCDisassembler *Decoder) {
4500 int imm = Val & 0x7F;
4501 if (Val == 0)
4502 imm = INT32_MIN;
4503 else if (!(Val & 0x80))
4504 imm *= -1;
4505 if (imm != INT32_MIN)
4506 imm *= (1U << shift);
4507 Inst.addOperand(MCOperand::createImm(imm));
4508
4509 return MCDisassembler::Success;
4510 }
4511
DecodeT2AddrModeImm8(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4512 static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
4513 uint64_t Address,
4514 const MCDisassembler *Decoder) {
4515 DecodeStatus S = MCDisassembler::Success;
4516
4517 unsigned Rn = fieldFromInstruction(Val, 9, 4);
4518 unsigned imm = fieldFromInstruction(Val, 0, 9);
4519
4520 // Thumb stores cannot use PC as dest register.
4521 switch (Inst.getOpcode()) {
4522 case ARM::t2STRT:
4523 case ARM::t2STRBT:
4524 case ARM::t2STRHT:
4525 case ARM::t2STRi8:
4526 case ARM::t2STRHi8:
4527 case ARM::t2STRBi8:
4528 if (Rn == 15)
4529 return MCDisassembler::Fail;
4530 break;
4531 default:
4532 break;
4533 }
4534
4535 // Some instructions always use an additive offset.
4536 switch (Inst.getOpcode()) {
4537 case ARM::t2LDRT:
4538 case ARM::t2LDRBT:
4539 case ARM::t2LDRHT:
4540 case ARM::t2LDRSBT:
4541 case ARM::t2LDRSHT:
4542 case ARM::t2STRT:
4543 case ARM::t2STRBT:
4544 case ARM::t2STRHT:
4545 imm |= 0x100;
4546 break;
4547 default:
4548 break;
4549 }
4550
4551 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4552 return MCDisassembler::Fail;
4553 if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder)))
4554 return MCDisassembler::Fail;
4555
4556 return S;
4557 }
4558
4559 template <int shift>
DecodeTAddrModeImm7(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4560 static DecodeStatus DecodeTAddrModeImm7(MCInst &Inst, unsigned Val,
4561 uint64_t Address,
4562 const MCDisassembler *Decoder) {
4563 DecodeStatus S = MCDisassembler::Success;
4564
4565 unsigned Rn = fieldFromInstruction(Val, 8, 3);
4566 unsigned imm = fieldFromInstruction(Val, 0, 8);
4567
4568 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
4569 return MCDisassembler::Fail;
4570 if (!Check(S, DecodeT2Imm7<shift>(Inst, imm, Address, Decoder)))
4571 return MCDisassembler::Fail;
4572
4573 return S;
4574 }
4575
4576 template <int shift, int WriteBack>
DecodeT2AddrModeImm7(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4577 static DecodeStatus DecodeT2AddrModeImm7(MCInst &Inst, unsigned Val,
4578 uint64_t Address,
4579 const MCDisassembler *Decoder) {
4580 DecodeStatus S = MCDisassembler::Success;
4581
4582 unsigned Rn = fieldFromInstruction(Val, 8, 4);
4583 unsigned imm = fieldFromInstruction(Val, 0, 8);
4584 if (WriteBack) {
4585 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
4586 return MCDisassembler::Fail;
4587 } else if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4588 return MCDisassembler::Fail;
4589 if (!Check(S, DecodeT2Imm7<shift>(Inst, imm, Address, Decoder)))
4590 return MCDisassembler::Fail;
4591
4592 return S;
4593 }
4594
DecodeT2LdStPre(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4595 static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Insn,
4596 uint64_t Address,
4597 const MCDisassembler *Decoder) {
4598 DecodeStatus S = MCDisassembler::Success;
4599
4600 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4601 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4602 unsigned addr = fieldFromInstruction(Insn, 0, 8);
4603 addr |= fieldFromInstruction(Insn, 9, 1) << 8;
4604 addr |= Rn << 9;
4605 unsigned load = fieldFromInstruction(Insn, 20, 1);
4606
4607 if (Rn == 15) {
4608 switch (Inst.getOpcode()) {
4609 case ARM::t2LDR_PRE:
4610 case ARM::t2LDR_POST:
4611 Inst.setOpcode(ARM::t2LDRpci);
4612 break;
4613 case ARM::t2LDRB_PRE:
4614 case ARM::t2LDRB_POST:
4615 Inst.setOpcode(ARM::t2LDRBpci);
4616 break;
4617 case ARM::t2LDRH_PRE:
4618 case ARM::t2LDRH_POST:
4619 Inst.setOpcode(ARM::t2LDRHpci);
4620 break;
4621 case ARM::t2LDRSB_PRE:
4622 case ARM::t2LDRSB_POST:
4623 if (Rt == 15)
4624 Inst.setOpcode(ARM::t2PLIpci);
4625 else
4626 Inst.setOpcode(ARM::t2LDRSBpci);
4627 break;
4628 case ARM::t2LDRSH_PRE:
4629 case ARM::t2LDRSH_POST:
4630 Inst.setOpcode(ARM::t2LDRSHpci);
4631 break;
4632 default:
4633 return MCDisassembler::Fail;
4634 }
4635 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4636 }
4637
4638 if (!load) {
4639 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4640 return MCDisassembler::Fail;
4641 }
4642
4643 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4644 return MCDisassembler::Fail;
4645
4646 if (load) {
4647 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4648 return MCDisassembler::Fail;
4649 }
4650
4651 if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder)))
4652 return MCDisassembler::Fail;
4653
4654 return S;
4655 }
4656
DecodeT2AddrModeImm12(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4657 static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
4658 uint64_t Address,
4659 const MCDisassembler *Decoder) {
4660 DecodeStatus S = MCDisassembler::Success;
4661
4662 unsigned Rn = fieldFromInstruction(Val, 13, 4);
4663 unsigned imm = fieldFromInstruction(Val, 0, 12);
4664
4665 // Thumb stores cannot use PC as dest register.
4666 switch (Inst.getOpcode()) {
4667 case ARM::t2STRi12:
4668 case ARM::t2STRBi12:
4669 case ARM::t2STRHi12:
4670 if (Rn == 15)
4671 return MCDisassembler::Fail;
4672 break;
4673 default:
4674 break;
4675 }
4676
4677 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4678 return MCDisassembler::Fail;
4679 Inst.addOperand(MCOperand::createImm(imm));
4680
4681 return S;
4682 }
4683
DecodeThumbAddSPImm(MCInst & Inst,uint16_t Insn,uint64_t Address,const MCDisassembler * Decoder)4684 static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Insn,
4685 uint64_t Address,
4686 const MCDisassembler *Decoder) {
4687 unsigned imm = fieldFromInstruction(Insn, 0, 7);
4688
4689 Inst.addOperand(MCOperand::createReg(ARM::SP));
4690 Inst.addOperand(MCOperand::createReg(ARM::SP));
4691 Inst.addOperand(MCOperand::createImm(imm));
4692
4693 return MCDisassembler::Success;
4694 }
4695
DecodeThumbAddSPReg(MCInst & Inst,uint16_t Insn,uint64_t Address,const MCDisassembler * Decoder)4696 static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
4697 uint64_t Address,
4698 const MCDisassembler *Decoder) {
4699 DecodeStatus S = MCDisassembler::Success;
4700
4701 if (Inst.getOpcode() == ARM::tADDrSP) {
4702 unsigned Rdm = fieldFromInstruction(Insn, 0, 3);
4703 Rdm |= fieldFromInstruction(Insn, 7, 1) << 3;
4704
4705 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
4706 return MCDisassembler::Fail;
4707 Inst.addOperand(MCOperand::createReg(ARM::SP));
4708 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
4709 return MCDisassembler::Fail;
4710 } else if (Inst.getOpcode() == ARM::tADDspr) {
4711 unsigned Rm = fieldFromInstruction(Insn, 3, 4);
4712
4713 Inst.addOperand(MCOperand::createReg(ARM::SP));
4714 Inst.addOperand(MCOperand::createReg(ARM::SP));
4715 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4716 return MCDisassembler::Fail;
4717 }
4718
4719 return S;
4720 }
4721
DecodeThumbCPS(MCInst & Inst,uint16_t Insn,uint64_t Address,const MCDisassembler * Decoder)4722 static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn,
4723 uint64_t Address,
4724 const MCDisassembler *Decoder) {
4725 unsigned imod = fieldFromInstruction(Insn, 4, 1) | 0x2;
4726 unsigned flags = fieldFromInstruction(Insn, 0, 3);
4727
4728 Inst.addOperand(MCOperand::createImm(imod));
4729 Inst.addOperand(MCOperand::createImm(flags));
4730
4731 return MCDisassembler::Success;
4732 }
4733
DecodePostIdxReg(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4734 static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn,
4735 uint64_t Address,
4736 const MCDisassembler *Decoder) {
4737 DecodeStatus S = MCDisassembler::Success;
4738 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4739 unsigned add = fieldFromInstruction(Insn, 4, 1);
4740
4741 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
4742 return MCDisassembler::Fail;
4743 Inst.addOperand(MCOperand::createImm(add));
4744
4745 return S;
4746 }
4747
DecodeMveAddrModeRQ(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4748 static DecodeStatus DecodeMveAddrModeRQ(MCInst &Inst, unsigned Insn,
4749 uint64_t Address,
4750 const MCDisassembler *Decoder) {
4751 DecodeStatus S = MCDisassembler::Success;
4752 unsigned Rn = fieldFromInstruction(Insn, 3, 4);
4753 unsigned Qm = fieldFromInstruction(Insn, 0, 3);
4754
4755 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4756 return MCDisassembler::Fail;
4757 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
4758 return MCDisassembler::Fail;
4759
4760 return S;
4761 }
4762
4763 template <int shift>
DecodeMveAddrModeQ(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4764 static DecodeStatus DecodeMveAddrModeQ(MCInst &Inst, unsigned Insn,
4765 uint64_t Address,
4766 const MCDisassembler *Decoder) {
4767 DecodeStatus S = MCDisassembler::Success;
4768 unsigned Qm = fieldFromInstruction(Insn, 8, 3);
4769 int imm = fieldFromInstruction(Insn, 0, 7);
4770
4771 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
4772 return MCDisassembler::Fail;
4773
4774 if(!fieldFromInstruction(Insn, 7, 1)) {
4775 if (imm == 0)
4776 imm = INT32_MIN; // indicate -0
4777 else
4778 imm *= -1;
4779 }
4780 if (imm != INT32_MIN)
4781 imm *= (1U << shift);
4782 Inst.addOperand(MCOperand::createImm(imm));
4783
4784 return S;
4785 }
4786
DecodeThumbBLXOffset(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4787 static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Val,
4788 uint64_t Address,
4789 const MCDisassembler *Decoder) {
4790 // Val is passed in as S:J1:J2:imm10H:imm10L:'0'
4791 // Note only one trailing zero not two. Also the J1 and J2 values are from
4792 // the encoded instruction. So here change to I1 and I2 values via:
4793 // I1 = NOT(J1 EOR S);
4794 // I2 = NOT(J2 EOR S);
4795 // and build the imm32 with two trailing zeros as documented:
4796 // imm32 = SignExtend(S:I1:I2:imm10H:imm10L:'00', 32);
4797 unsigned S = (Val >> 23) & 1;
4798 unsigned J1 = (Val >> 22) & 1;
4799 unsigned J2 = (Val >> 21) & 1;
4800 unsigned I1 = !(J1 ^ S);
4801 unsigned I2 = !(J2 ^ S);
4802 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21);
4803 int imm32 = SignExtend32<25>(tmp << 1);
4804
4805 if (!tryAddingSymbolicOperand(Address,
4806 (Address & ~2u) + imm32 + 4,
4807 true, 4, Inst, Decoder))
4808 Inst.addOperand(MCOperand::createImm(imm32));
4809 return MCDisassembler::Success;
4810 }
4811
DecodeCoprocessor(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4812 static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Val,
4813 uint64_t Address,
4814 const MCDisassembler *Decoder) {
4815 if (Val == 0xA || Val == 0xB)
4816 return MCDisassembler::Fail;
4817
4818 const FeatureBitset &featureBits =
4819 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4820
4821 if (!isValidCoprocessorNumber(Val, featureBits))
4822 return MCDisassembler::Fail;
4823
4824 Inst.addOperand(MCOperand::createImm(Val));
4825 return MCDisassembler::Success;
4826 }
4827
DecodeThumbTableBranch(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4828 static DecodeStatus DecodeThumbTableBranch(MCInst &Inst, unsigned Insn,
4829 uint64_t Address,
4830 const MCDisassembler *Decoder) {
4831 const FeatureBitset &FeatureBits =
4832 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4833 DecodeStatus S = MCDisassembler::Success;
4834
4835 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4836 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4837
4838 if (Rn == 13 && !FeatureBits[ARM::HasV8Ops]) S = MCDisassembler::SoftFail;
4839 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4840 return MCDisassembler::Fail;
4841 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
4842 return MCDisassembler::Fail;
4843 return S;
4844 }
4845
DecodeThumb2BCCInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)4846 static DecodeStatus DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Insn,
4847 uint64_t Address,
4848 const MCDisassembler *Decoder) {
4849 DecodeStatus S = MCDisassembler::Success;
4850
4851 unsigned pred = fieldFromInstruction(Insn, 22, 4);
4852 if (pred == 0xE || pred == 0xF) {
4853 unsigned opc = fieldFromInstruction(Insn, 4, 28);
4854 switch (opc) {
4855 default:
4856 return MCDisassembler::Fail;
4857 case 0xf3bf8f4:
4858 Inst.setOpcode(ARM::t2DSB);
4859 break;
4860 case 0xf3bf8f5:
4861 Inst.setOpcode(ARM::t2DMB);
4862 break;
4863 case 0xf3bf8f6:
4864 Inst.setOpcode(ARM::t2ISB);
4865 break;
4866 }
4867
4868 unsigned imm = fieldFromInstruction(Insn, 0, 4);
4869 return DecodeMemBarrierOption(Inst, imm, Address, Decoder);
4870 }
4871
4872 unsigned brtarget = fieldFromInstruction(Insn, 0, 11) << 1;
4873 brtarget |= fieldFromInstruction(Insn, 11, 1) << 19;
4874 brtarget |= fieldFromInstruction(Insn, 13, 1) << 18;
4875 brtarget |= fieldFromInstruction(Insn, 16, 6) << 12;
4876 brtarget |= fieldFromInstruction(Insn, 26, 1) << 20;
4877
4878 if (!Check(S, DecodeT2BROperand(Inst, brtarget, Address, Decoder)))
4879 return MCDisassembler::Fail;
4880 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4881 return MCDisassembler::Fail;
4882
4883 return S;
4884 }
4885
4886 // Decode a shifted immediate operand. These basically consist
4887 // of an 8-bit value, and a 4-bit directive that specifies either
4888 // a splat operation or a rotation.
DecodeT2SOImm(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4889 static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val, uint64_t Address,
4890 const MCDisassembler *Decoder) {
4891 unsigned ctrl = fieldFromInstruction(Val, 10, 2);
4892 if (ctrl == 0) {
4893 unsigned byte = fieldFromInstruction(Val, 8, 2);
4894 unsigned imm = fieldFromInstruction(Val, 0, 8);
4895 switch (byte) {
4896 case 0:
4897 Inst.addOperand(MCOperand::createImm(imm));
4898 break;
4899 case 1:
4900 Inst.addOperand(MCOperand::createImm((imm << 16) | imm));
4901 break;
4902 case 2:
4903 Inst.addOperand(MCOperand::createImm((imm << 24) | (imm << 8)));
4904 break;
4905 case 3:
4906 Inst.addOperand(MCOperand::createImm((imm << 24) | (imm << 16) |
4907 (imm << 8) | imm));
4908 break;
4909 }
4910 } else {
4911 unsigned unrot = fieldFromInstruction(Val, 0, 7) | 0x80;
4912 unsigned rot = fieldFromInstruction(Val, 7, 5);
4913 unsigned imm = llvm::rotr<uint32_t>(unrot, rot);
4914 Inst.addOperand(MCOperand::createImm(imm));
4915 }
4916
4917 return MCDisassembler::Success;
4918 }
4919
DecodeThumbBCCTargetOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4920 static DecodeStatus DecodeThumbBCCTargetOperand(MCInst &Inst, unsigned Val,
4921 uint64_t Address,
4922 const MCDisassembler *Decoder) {
4923 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<9>(Val<<1) + 4,
4924 true, 2, Inst, Decoder))
4925 Inst.addOperand(MCOperand::createImm(SignExtend32<9>(Val << 1)));
4926 return MCDisassembler::Success;
4927 }
4928
DecodeThumbBLTargetOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4929 static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val,
4930 uint64_t Address,
4931 const MCDisassembler *Decoder) {
4932 // Val is passed in as S:J1:J2:imm10:imm11
4933 // Note no trailing zero after imm11. Also the J1 and J2 values are from
4934 // the encoded instruction. So here change to I1 and I2 values via:
4935 // I1 = NOT(J1 EOR S);
4936 // I2 = NOT(J2 EOR S);
4937 // and build the imm32 with one trailing zero as documented:
4938 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
4939 unsigned S = (Val >> 23) & 1;
4940 unsigned J1 = (Val >> 22) & 1;
4941 unsigned J2 = (Val >> 21) & 1;
4942 unsigned I1 = !(J1 ^ S);
4943 unsigned I2 = !(J2 ^ S);
4944 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21);
4945 int imm32 = SignExtend32<25>(tmp << 1);
4946
4947 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
4948 true, 4, Inst, Decoder))
4949 Inst.addOperand(MCOperand::createImm(imm32));
4950 return MCDisassembler::Success;
4951 }
4952
DecodeMemBarrierOption(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4953 static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Val,
4954 uint64_t Address,
4955 const MCDisassembler *Decoder) {
4956 if (Val & ~0xf)
4957 return MCDisassembler::Fail;
4958
4959 Inst.addOperand(MCOperand::createImm(Val));
4960 return MCDisassembler::Success;
4961 }
4962
DecodeInstSyncBarrierOption(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4963 static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Val,
4964 uint64_t Address,
4965 const MCDisassembler *Decoder) {
4966 if (Val & ~0xf)
4967 return MCDisassembler::Fail;
4968
4969 Inst.addOperand(MCOperand::createImm(Val));
4970 return MCDisassembler::Success;
4971 }
4972
DecodeMSRMask(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)4973 static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Val, uint64_t Address,
4974 const MCDisassembler *Decoder) {
4975 DecodeStatus S = MCDisassembler::Success;
4976 const FeatureBitset &FeatureBits =
4977 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4978
4979 if (FeatureBits[ARM::FeatureMClass]) {
4980 unsigned ValLow = Val & 0xff;
4981
4982 // Validate the SYSm value first.
4983 switch (ValLow) {
4984 case 0: // apsr
4985 case 1: // iapsr
4986 case 2: // eapsr
4987 case 3: // xpsr
4988 case 5: // ipsr
4989 case 6: // epsr
4990 case 7: // iepsr
4991 case 8: // msp
4992 case 9: // psp
4993 case 16: // primask
4994 case 20: // control
4995 break;
4996 case 17: // basepri
4997 case 18: // basepri_max
4998 case 19: // faultmask
4999 if (!(FeatureBits[ARM::HasV7Ops]))
5000 // Values basepri, basepri_max and faultmask are only valid for v7m.
5001 return MCDisassembler::Fail;
5002 break;
5003 case 0x8a: // msplim_ns
5004 case 0x8b: // psplim_ns
5005 case 0x91: // basepri_ns
5006 case 0x93: // faultmask_ns
5007 if (!(FeatureBits[ARM::HasV8MMainlineOps]))
5008 return MCDisassembler::Fail;
5009 [[fallthrough]];
5010 case 10: // msplim
5011 case 11: // psplim
5012 case 0x88: // msp_ns
5013 case 0x89: // psp_ns
5014 case 0x90: // primask_ns
5015 case 0x94: // control_ns
5016 case 0x98: // sp_ns
5017 if (!(FeatureBits[ARM::Feature8MSecExt]))
5018 return MCDisassembler::Fail;
5019 break;
5020 case 0x20: // pac_key_p_0
5021 case 0x21: // pac_key_p_1
5022 case 0x22: // pac_key_p_2
5023 case 0x23: // pac_key_p_3
5024 case 0x24: // pac_key_u_0
5025 case 0x25: // pac_key_u_1
5026 case 0x26: // pac_key_u_2
5027 case 0x27: // pac_key_u_3
5028 case 0xa0: // pac_key_p_0_ns
5029 case 0xa1: // pac_key_p_1_ns
5030 case 0xa2: // pac_key_p_2_ns
5031 case 0xa3: // pac_key_p_3_ns
5032 case 0xa4: // pac_key_u_0_ns
5033 case 0xa5: // pac_key_u_1_ns
5034 case 0xa6: // pac_key_u_2_ns
5035 case 0xa7: // pac_key_u_3_ns
5036 if (!(FeatureBits[ARM::FeaturePACBTI]))
5037 return MCDisassembler::Fail;
5038 break;
5039 default:
5040 // Architecturally defined as unpredictable
5041 S = MCDisassembler::SoftFail;
5042 break;
5043 }
5044
5045 if (Inst.getOpcode() == ARM::t2MSR_M) {
5046 unsigned Mask = fieldFromInstruction(Val, 10, 2);
5047 if (!(FeatureBits[ARM::HasV7Ops])) {
5048 // The ARMv6-M MSR bits {11-10} can be only 0b10, other values are
5049 // unpredictable.
5050 if (Mask != 2)
5051 S = MCDisassembler::SoftFail;
5052 }
5053 else {
5054 // The ARMv7-M architecture stores an additional 2-bit mask value in
5055 // MSR bits {11-10}. The mask is used only with apsr, iapsr, eapsr and
5056 // xpsr, it has to be 0b10 in other cases. Bit mask{1} indicates if
5057 // the NZCVQ bits should be moved by the instruction. Bit mask{0}
5058 // indicates the move for the GE{3:0} bits, the mask{0} bit can be set
5059 // only if the processor includes the DSP extension.
5060 if (Mask == 0 || (Mask != 2 && ValLow > 3) ||
5061 (!(FeatureBits[ARM::FeatureDSP]) && (Mask & 1)))
5062 S = MCDisassembler::SoftFail;
5063 }
5064 }
5065 } else {
5066 // A/R class
5067 if (Val == 0)
5068 return MCDisassembler::Fail;
5069 }
5070 Inst.addOperand(MCOperand::createImm(Val));
5071 return S;
5072 }
5073
DecodeBankedReg(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)5074 static DecodeStatus DecodeBankedReg(MCInst &Inst, unsigned Val,
5075 uint64_t Address,
5076 const MCDisassembler *Decoder) {
5077 unsigned R = fieldFromInstruction(Val, 5, 1);
5078 unsigned SysM = fieldFromInstruction(Val, 0, 5);
5079
5080 // The table of encodings for these banked registers comes from B9.2.3 of the
5081 // ARM ARM. There are patterns, but nothing regular enough to make this logic
5082 // neater. So by fiat, these values are UNPREDICTABLE:
5083 if (!ARMBankedReg::lookupBankedRegByEncoding((R << 5) | SysM))
5084 return MCDisassembler::Fail;
5085
5086 Inst.addOperand(MCOperand::createImm(Val));
5087 return MCDisassembler::Success;
5088 }
5089
DecodeDoubleRegLoad(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5090 static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn,
5091 uint64_t Address,
5092 const MCDisassembler *Decoder) {
5093 DecodeStatus S = MCDisassembler::Success;
5094
5095 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5096 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5097 unsigned pred = fieldFromInstruction(Insn, 28, 4);
5098
5099 if (Rn == 0xF)
5100 S = MCDisassembler::SoftFail;
5101
5102 if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder)))
5103 return MCDisassembler::Fail;
5104 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5105 return MCDisassembler::Fail;
5106 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
5107 return MCDisassembler::Fail;
5108
5109 return S;
5110 }
5111
DecodeDoubleRegStore(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5112 static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn,
5113 uint64_t Address,
5114 const MCDisassembler *Decoder) {
5115 DecodeStatus S = MCDisassembler::Success;
5116
5117 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
5118 unsigned Rt = fieldFromInstruction(Insn, 0, 4);
5119 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5120 unsigned pred = fieldFromInstruction(Insn, 28, 4);
5121
5122 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
5123 return MCDisassembler::Fail;
5124
5125 if (Rn == 0xF || Rd == Rn || Rd == Rt || Rd == Rt+1)
5126 S = MCDisassembler::SoftFail;
5127
5128 if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder)))
5129 return MCDisassembler::Fail;
5130 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5131 return MCDisassembler::Fail;
5132 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
5133 return MCDisassembler::Fail;
5134
5135 return S;
5136 }
5137
DecodeLDRPreImm(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5138 static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn,
5139 uint64_t Address,
5140 const MCDisassembler *Decoder) {
5141 DecodeStatus S = MCDisassembler::Success;
5142
5143 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5144 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5145 unsigned imm = fieldFromInstruction(Insn, 0, 12);
5146 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
5147 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
5148 unsigned pred = fieldFromInstruction(Insn, 28, 4);
5149
5150 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
5151
5152 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
5153 return MCDisassembler::Fail;
5154 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5155 return MCDisassembler::Fail;
5156 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder)))
5157 return MCDisassembler::Fail;
5158 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
5159 return MCDisassembler::Fail;
5160
5161 return S;
5162 }
5163
DecodeLDRPreReg(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5164 static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn,
5165 uint64_t Address,
5166 const MCDisassembler *Decoder) {
5167 DecodeStatus S = MCDisassembler::Success;
5168
5169 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5170 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5171 unsigned imm = fieldFromInstruction(Insn, 0, 12);
5172 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
5173 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
5174 unsigned pred = fieldFromInstruction(Insn, 28, 4);
5175 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
5176
5177 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
5178 if (Rm == 0xF) S = MCDisassembler::SoftFail;
5179
5180 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
5181 return MCDisassembler::Fail;
5182 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5183 return MCDisassembler::Fail;
5184 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder)))
5185 return MCDisassembler::Fail;
5186 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
5187 return MCDisassembler::Fail;
5188
5189 return S;
5190 }
5191
DecodeSTRPreImm(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5192 static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn,
5193 uint64_t Address,
5194 const MCDisassembler *Decoder) {
5195 DecodeStatus S = MCDisassembler::Success;
5196
5197 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5198 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5199 unsigned imm = fieldFromInstruction(Insn, 0, 12);
5200 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
5201 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
5202 unsigned pred = fieldFromInstruction(Insn, 28, 4);
5203
5204 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
5205
5206 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5207 return MCDisassembler::Fail;
5208 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
5209 return MCDisassembler::Fail;
5210 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder)))
5211 return MCDisassembler::Fail;
5212 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
5213 return MCDisassembler::Fail;
5214
5215 return S;
5216 }
5217
DecodeSTRPreReg(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5218 static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn,
5219 uint64_t Address,
5220 const MCDisassembler *Decoder) {
5221 DecodeStatus S = MCDisassembler::Success;
5222
5223 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5224 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5225 unsigned imm = fieldFromInstruction(Insn, 0, 12);
5226 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
5227 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
5228 unsigned pred = fieldFromInstruction(Insn, 28, 4);
5229
5230 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
5231
5232 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5233 return MCDisassembler::Fail;
5234 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
5235 return MCDisassembler::Fail;
5236 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder)))
5237 return MCDisassembler::Fail;
5238 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
5239 return MCDisassembler::Fail;
5240
5241 return S;
5242 }
5243
DecodeVLD1LN(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5244 static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn, uint64_t Address,
5245 const MCDisassembler *Decoder) {
5246 DecodeStatus S = MCDisassembler::Success;
5247
5248 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5249 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
5250 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
5251 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
5252 unsigned size = fieldFromInstruction(Insn, 10, 2);
5253
5254 unsigned align = 0;
5255 unsigned index = 0;
5256 switch (size) {
5257 default:
5258 return MCDisassembler::Fail;
5259 case 0:
5260 if (fieldFromInstruction(Insn, 4, 1))
5261 return MCDisassembler::Fail; // UNDEFINED
5262 index = fieldFromInstruction(Insn, 5, 3);
5263 break;
5264 case 1:
5265 if (fieldFromInstruction(Insn, 5, 1))
5266 return MCDisassembler::Fail; // UNDEFINED
5267 index = fieldFromInstruction(Insn, 6, 2);
5268 if (fieldFromInstruction(Insn, 4, 1))
5269 align = 2;
5270 break;
5271 case 2:
5272 if (fieldFromInstruction(Insn, 6, 1))
5273 return MCDisassembler::Fail; // UNDEFINED
5274 index = fieldFromInstruction(Insn, 7, 1);
5275
5276 switch (fieldFromInstruction(Insn, 4, 2)) {
5277 case 0 :
5278 align = 0; break;
5279 case 3:
5280 align = 4; break;
5281 default:
5282 return MCDisassembler::Fail;
5283 }
5284 break;
5285 }
5286
5287 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5288 return MCDisassembler::Fail;
5289 if (Rm != 0xF) { // Writeback
5290 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5291 return MCDisassembler::Fail;
5292 }
5293 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5294 return MCDisassembler::Fail;
5295 Inst.addOperand(MCOperand::createImm(align));
5296 if (Rm != 0xF) {
5297 if (Rm != 0xD) {
5298 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
5299 return MCDisassembler::Fail;
5300 } else
5301 Inst.addOperand(MCOperand::createReg(0));
5302 }
5303
5304 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5305 return MCDisassembler::Fail;
5306 Inst.addOperand(MCOperand::createImm(index));
5307
5308 return S;
5309 }
5310
DecodeVST1LN(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5311 static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn, uint64_t Address,
5312 const MCDisassembler *Decoder) {
5313 DecodeStatus S = MCDisassembler::Success;
5314
5315 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5316 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
5317 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
5318 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
5319 unsigned size = fieldFromInstruction(Insn, 10, 2);
5320
5321 unsigned align = 0;
5322 unsigned index = 0;
5323 switch (size) {
5324 default:
5325 return MCDisassembler::Fail;
5326 case 0:
5327 if (fieldFromInstruction(Insn, 4, 1))
5328 return MCDisassembler::Fail; // UNDEFINED
5329 index = fieldFromInstruction(Insn, 5, 3);
5330 break;
5331 case 1:
5332 if (fieldFromInstruction(Insn, 5, 1))
5333 return MCDisassembler::Fail; // UNDEFINED
5334 index = fieldFromInstruction(Insn, 6, 2);
5335 if (fieldFromInstruction(Insn, 4, 1))
5336 align = 2;
5337 break;
5338 case 2:
5339 if (fieldFromInstruction(Insn, 6, 1))
5340 return MCDisassembler::Fail; // UNDEFINED
5341 index = fieldFromInstruction(Insn, 7, 1);
5342
5343 switch (fieldFromInstruction(Insn, 4, 2)) {
5344 case 0:
5345 align = 0; break;
5346 case 3:
5347 align = 4; break;
5348 default:
5349 return MCDisassembler::Fail;
5350 }
5351 break;
5352 }
5353
5354 if (Rm != 0xF) { // Writeback
5355 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5356 return MCDisassembler::Fail;
5357 }
5358 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5359 return MCDisassembler::Fail;
5360 Inst.addOperand(MCOperand::createImm(align));
5361 if (Rm != 0xF) {
5362 if (Rm != 0xD) {
5363 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
5364 return MCDisassembler::Fail;
5365 } else
5366 Inst.addOperand(MCOperand::createReg(0));
5367 }
5368
5369 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5370 return MCDisassembler::Fail;
5371 Inst.addOperand(MCOperand::createImm(index));
5372
5373 return S;
5374 }
5375
DecodeVLD2LN(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5376 static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn, uint64_t Address,
5377 const MCDisassembler *Decoder) {
5378 DecodeStatus S = MCDisassembler::Success;
5379
5380 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5381 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
5382 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
5383 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
5384 unsigned size = fieldFromInstruction(Insn, 10, 2);
5385
5386 unsigned align = 0;
5387 unsigned index = 0;
5388 unsigned inc = 1;
5389 switch (size) {
5390 default:
5391 return MCDisassembler::Fail;
5392 case 0:
5393 index = fieldFromInstruction(Insn, 5, 3);
5394 if (fieldFromInstruction(Insn, 4, 1))
5395 align = 2;
5396 break;
5397 case 1:
5398 index = fieldFromInstruction(Insn, 6, 2);
5399 if (fieldFromInstruction(Insn, 4, 1))
5400 align = 4;
5401 if (fieldFromInstruction(Insn, 5, 1))
5402 inc = 2;
5403 break;
5404 case 2:
5405 if (fieldFromInstruction(Insn, 5, 1))
5406 return MCDisassembler::Fail; // UNDEFINED
5407 index = fieldFromInstruction(Insn, 7, 1);
5408 if (fieldFromInstruction(Insn, 4, 1) != 0)
5409 align = 8;
5410 if (fieldFromInstruction(Insn, 6, 1))
5411 inc = 2;
5412 break;
5413 }
5414
5415 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5416 return MCDisassembler::Fail;
5417 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
5418 return MCDisassembler::Fail;
5419 if (Rm != 0xF) { // Writeback
5420 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5421 return MCDisassembler::Fail;
5422 }
5423 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5424 return MCDisassembler::Fail;
5425 Inst.addOperand(MCOperand::createImm(align));
5426 if (Rm != 0xF) {
5427 if (Rm != 0xD) {
5428 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
5429 return MCDisassembler::Fail;
5430 } else
5431 Inst.addOperand(MCOperand::createReg(0));
5432 }
5433
5434 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5435 return MCDisassembler::Fail;
5436 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
5437 return MCDisassembler::Fail;
5438 Inst.addOperand(MCOperand::createImm(index));
5439
5440 return S;
5441 }
5442
DecodeVST2LN(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5443 static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn, uint64_t Address,
5444 const MCDisassembler *Decoder) {
5445 DecodeStatus S = MCDisassembler::Success;
5446
5447 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5448 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
5449 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
5450 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
5451 unsigned size = fieldFromInstruction(Insn, 10, 2);
5452
5453 unsigned align = 0;
5454 unsigned index = 0;
5455 unsigned inc = 1;
5456 switch (size) {
5457 default:
5458 return MCDisassembler::Fail;
5459 case 0:
5460 index = fieldFromInstruction(Insn, 5, 3);
5461 if (fieldFromInstruction(Insn, 4, 1))
5462 align = 2;
5463 break;
5464 case 1:
5465 index = fieldFromInstruction(Insn, 6, 2);
5466 if (fieldFromInstruction(Insn, 4, 1))
5467 align = 4;
5468 if (fieldFromInstruction(Insn, 5, 1))
5469 inc = 2;
5470 break;
5471 case 2:
5472 if (fieldFromInstruction(Insn, 5, 1))
5473 return MCDisassembler::Fail; // UNDEFINED
5474 index = fieldFromInstruction(Insn, 7, 1);
5475 if (fieldFromInstruction(Insn, 4, 1) != 0)
5476 align = 8;
5477 if (fieldFromInstruction(Insn, 6, 1))
5478 inc = 2;
5479 break;
5480 }
5481
5482 if (Rm != 0xF) { // Writeback
5483 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5484 return MCDisassembler::Fail;
5485 }
5486 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5487 return MCDisassembler::Fail;
5488 Inst.addOperand(MCOperand::createImm(align));
5489 if (Rm != 0xF) {
5490 if (Rm != 0xD) {
5491 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
5492 return MCDisassembler::Fail;
5493 } else
5494 Inst.addOperand(MCOperand::createReg(0));
5495 }
5496
5497 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5498 return MCDisassembler::Fail;
5499 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
5500 return MCDisassembler::Fail;
5501 Inst.addOperand(MCOperand::createImm(index));
5502
5503 return S;
5504 }
5505
DecodeVLD3LN(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5506 static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn, uint64_t Address,
5507 const MCDisassembler *Decoder) {
5508 DecodeStatus S = MCDisassembler::Success;
5509
5510 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5511 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
5512 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
5513 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
5514 unsigned size = fieldFromInstruction(Insn, 10, 2);
5515
5516 unsigned align = 0;
5517 unsigned index = 0;
5518 unsigned inc = 1;
5519 switch (size) {
5520 default:
5521 return MCDisassembler::Fail;
5522 case 0:
5523 if (fieldFromInstruction(Insn, 4, 1))
5524 return MCDisassembler::Fail; // UNDEFINED
5525 index = fieldFromInstruction(Insn, 5, 3);
5526 break;
5527 case 1:
5528 if (fieldFromInstruction(Insn, 4, 1))
5529 return MCDisassembler::Fail; // UNDEFINED
5530 index = fieldFromInstruction(Insn, 6, 2);
5531 if (fieldFromInstruction(Insn, 5, 1))
5532 inc = 2;
5533 break;
5534 case 2:
5535 if (fieldFromInstruction(Insn, 4, 2))
5536 return MCDisassembler::Fail; // UNDEFINED
5537 index = fieldFromInstruction(Insn, 7, 1);
5538 if (fieldFromInstruction(Insn, 6, 1))
5539 inc = 2;
5540 break;
5541 }
5542
5543 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5544 return MCDisassembler::Fail;
5545 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
5546 return MCDisassembler::Fail;
5547 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
5548 return MCDisassembler::Fail;
5549
5550 if (Rm != 0xF) { // Writeback
5551 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5552 return MCDisassembler::Fail;
5553 }
5554 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5555 return MCDisassembler::Fail;
5556 Inst.addOperand(MCOperand::createImm(align));
5557 if (Rm != 0xF) {
5558 if (Rm != 0xD) {
5559 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
5560 return MCDisassembler::Fail;
5561 } else
5562 Inst.addOperand(MCOperand::createReg(0));
5563 }
5564
5565 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5566 return MCDisassembler::Fail;
5567 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
5568 return MCDisassembler::Fail;
5569 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
5570 return MCDisassembler::Fail;
5571 Inst.addOperand(MCOperand::createImm(index));
5572
5573 return S;
5574 }
5575
DecodeVST3LN(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5576 static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn, uint64_t Address,
5577 const MCDisassembler *Decoder) {
5578 DecodeStatus S = MCDisassembler::Success;
5579
5580 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5581 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
5582 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
5583 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
5584 unsigned size = fieldFromInstruction(Insn, 10, 2);
5585
5586 unsigned align = 0;
5587 unsigned index = 0;
5588 unsigned inc = 1;
5589 switch (size) {
5590 default:
5591 return MCDisassembler::Fail;
5592 case 0:
5593 if (fieldFromInstruction(Insn, 4, 1))
5594 return MCDisassembler::Fail; // UNDEFINED
5595 index = fieldFromInstruction(Insn, 5, 3);
5596 break;
5597 case 1:
5598 if (fieldFromInstruction(Insn, 4, 1))
5599 return MCDisassembler::Fail; // UNDEFINED
5600 index = fieldFromInstruction(Insn, 6, 2);
5601 if (fieldFromInstruction(Insn, 5, 1))
5602 inc = 2;
5603 break;
5604 case 2:
5605 if (fieldFromInstruction(Insn, 4, 2))
5606 return MCDisassembler::Fail; // UNDEFINED
5607 index = fieldFromInstruction(Insn, 7, 1);
5608 if (fieldFromInstruction(Insn, 6, 1))
5609 inc = 2;
5610 break;
5611 }
5612
5613 if (Rm != 0xF) { // Writeback
5614 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5615 return MCDisassembler::Fail;
5616 }
5617 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5618 return MCDisassembler::Fail;
5619 Inst.addOperand(MCOperand::createImm(align));
5620 if (Rm != 0xF) {
5621 if (Rm != 0xD) {
5622 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
5623 return MCDisassembler::Fail;
5624 } else
5625 Inst.addOperand(MCOperand::createReg(0));
5626 }
5627
5628 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5629 return MCDisassembler::Fail;
5630 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
5631 return MCDisassembler::Fail;
5632 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
5633 return MCDisassembler::Fail;
5634 Inst.addOperand(MCOperand::createImm(index));
5635
5636 return S;
5637 }
5638
DecodeVLD4LN(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5639 static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn, uint64_t Address,
5640 const MCDisassembler *Decoder) {
5641 DecodeStatus S = MCDisassembler::Success;
5642
5643 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5644 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
5645 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
5646 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
5647 unsigned size = fieldFromInstruction(Insn, 10, 2);
5648
5649 unsigned align = 0;
5650 unsigned index = 0;
5651 unsigned inc = 1;
5652 switch (size) {
5653 default:
5654 return MCDisassembler::Fail;
5655 case 0:
5656 if (fieldFromInstruction(Insn, 4, 1))
5657 align = 4;
5658 index = fieldFromInstruction(Insn, 5, 3);
5659 break;
5660 case 1:
5661 if (fieldFromInstruction(Insn, 4, 1))
5662 align = 8;
5663 index = fieldFromInstruction(Insn, 6, 2);
5664 if (fieldFromInstruction(Insn, 5, 1))
5665 inc = 2;
5666 break;
5667 case 2:
5668 switch (fieldFromInstruction(Insn, 4, 2)) {
5669 case 0:
5670 align = 0; break;
5671 case 3:
5672 return MCDisassembler::Fail;
5673 default:
5674 align = 4 << fieldFromInstruction(Insn, 4, 2); break;
5675 }
5676
5677 index = fieldFromInstruction(Insn, 7, 1);
5678 if (fieldFromInstruction(Insn, 6, 1))
5679 inc = 2;
5680 break;
5681 }
5682
5683 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5684 return MCDisassembler::Fail;
5685 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
5686 return MCDisassembler::Fail;
5687 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
5688 return MCDisassembler::Fail;
5689 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder)))
5690 return MCDisassembler::Fail;
5691
5692 if (Rm != 0xF) { // Writeback
5693 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5694 return MCDisassembler::Fail;
5695 }
5696 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5697 return MCDisassembler::Fail;
5698 Inst.addOperand(MCOperand::createImm(align));
5699 if (Rm != 0xF) {
5700 if (Rm != 0xD) {
5701 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
5702 return MCDisassembler::Fail;
5703 } else
5704 Inst.addOperand(MCOperand::createReg(0));
5705 }
5706
5707 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5708 return MCDisassembler::Fail;
5709 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
5710 return MCDisassembler::Fail;
5711 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
5712 return MCDisassembler::Fail;
5713 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder)))
5714 return MCDisassembler::Fail;
5715 Inst.addOperand(MCOperand::createImm(index));
5716
5717 return S;
5718 }
5719
DecodeVST4LN(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5720 static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn, uint64_t Address,
5721 const MCDisassembler *Decoder) {
5722 DecodeStatus S = MCDisassembler::Success;
5723
5724 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5725 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
5726 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
5727 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
5728 unsigned size = fieldFromInstruction(Insn, 10, 2);
5729
5730 unsigned align = 0;
5731 unsigned index = 0;
5732 unsigned inc = 1;
5733 switch (size) {
5734 default:
5735 return MCDisassembler::Fail;
5736 case 0:
5737 if (fieldFromInstruction(Insn, 4, 1))
5738 align = 4;
5739 index = fieldFromInstruction(Insn, 5, 3);
5740 break;
5741 case 1:
5742 if (fieldFromInstruction(Insn, 4, 1))
5743 align = 8;
5744 index = fieldFromInstruction(Insn, 6, 2);
5745 if (fieldFromInstruction(Insn, 5, 1))
5746 inc = 2;
5747 break;
5748 case 2:
5749 switch (fieldFromInstruction(Insn, 4, 2)) {
5750 case 0:
5751 align = 0; break;
5752 case 3:
5753 return MCDisassembler::Fail;
5754 default:
5755 align = 4 << fieldFromInstruction(Insn, 4, 2); break;
5756 }
5757
5758 index = fieldFromInstruction(Insn, 7, 1);
5759 if (fieldFromInstruction(Insn, 6, 1))
5760 inc = 2;
5761 break;
5762 }
5763
5764 if (Rm != 0xF) { // Writeback
5765 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5766 return MCDisassembler::Fail;
5767 }
5768 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
5769 return MCDisassembler::Fail;
5770 Inst.addOperand(MCOperand::createImm(align));
5771 if (Rm != 0xF) {
5772 if (Rm != 0xD) {
5773 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
5774 return MCDisassembler::Fail;
5775 } else
5776 Inst.addOperand(MCOperand::createReg(0));
5777 }
5778
5779 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
5780 return MCDisassembler::Fail;
5781 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
5782 return MCDisassembler::Fail;
5783 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
5784 return MCDisassembler::Fail;
5785 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder)))
5786 return MCDisassembler::Fail;
5787 Inst.addOperand(MCOperand::createImm(index));
5788
5789 return S;
5790 }
5791
DecodeVMOVSRR(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5792 static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn, uint64_t Address,
5793 const MCDisassembler *Decoder) {
5794 DecodeStatus S = MCDisassembler::Success;
5795 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5796 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
5797 unsigned Rm = fieldFromInstruction(Insn, 5, 1);
5798 unsigned pred = fieldFromInstruction(Insn, 28, 4);
5799 Rm |= fieldFromInstruction(Insn, 0, 4) << 1;
5800
5801 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F)
5802 S = MCDisassembler::SoftFail;
5803
5804 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder)))
5805 return MCDisassembler::Fail;
5806 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder)))
5807 return MCDisassembler::Fail;
5808 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder)))
5809 return MCDisassembler::Fail;
5810 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder)))
5811 return MCDisassembler::Fail;
5812 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
5813 return MCDisassembler::Fail;
5814
5815 return S;
5816 }
5817
DecodeVMOVRRS(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5818 static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn, uint64_t Address,
5819 const MCDisassembler *Decoder) {
5820 DecodeStatus S = MCDisassembler::Success;
5821 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5822 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
5823 unsigned Rm = fieldFromInstruction(Insn, 5, 1);
5824 unsigned pred = fieldFromInstruction(Insn, 28, 4);
5825 Rm |= fieldFromInstruction(Insn, 0, 4) << 1;
5826
5827 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F)
5828 S = MCDisassembler::SoftFail;
5829
5830 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder)))
5831 return MCDisassembler::Fail;
5832 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder)))
5833 return MCDisassembler::Fail;
5834 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder)))
5835 return MCDisassembler::Fail;
5836 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder)))
5837 return MCDisassembler::Fail;
5838 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
5839 return MCDisassembler::Fail;
5840
5841 return S;
5842 }
5843
DecodeIT(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5844 static DecodeStatus DecodeIT(MCInst &Inst, unsigned Insn, uint64_t Address,
5845 const MCDisassembler *Decoder) {
5846 DecodeStatus S = MCDisassembler::Success;
5847 unsigned pred = fieldFromInstruction(Insn, 4, 4);
5848 unsigned mask = fieldFromInstruction(Insn, 0, 4);
5849
5850 if (pred == 0xF) {
5851 pred = 0xE;
5852 S = MCDisassembler::SoftFail;
5853 }
5854
5855 if (mask == 0x0)
5856 return MCDisassembler::Fail;
5857
5858 // IT masks are encoded as a sequence of replacement low-order bits
5859 // for the condition code. So if the low bit of the starting
5860 // condition code is 1, then we have to flip all the bits above the
5861 // terminating bit (which is the lowest 1 bit).
5862 if (pred & 1) {
5863 unsigned LowBit = mask & -mask;
5864 unsigned BitsAboveLowBit = 0xF & (-LowBit << 1);
5865 mask ^= BitsAboveLowBit;
5866 }
5867
5868 Inst.addOperand(MCOperand::createImm(pred));
5869 Inst.addOperand(MCOperand::createImm(mask));
5870 return S;
5871 }
5872
DecodeT2LDRDPreInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5873 static DecodeStatus DecodeT2LDRDPreInstruction(MCInst &Inst, unsigned Insn,
5874 uint64_t Address,
5875 const MCDisassembler *Decoder) {
5876 DecodeStatus S = MCDisassembler::Success;
5877
5878 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5879 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4);
5880 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5881 unsigned addr = fieldFromInstruction(Insn, 0, 8);
5882 unsigned W = fieldFromInstruction(Insn, 21, 1);
5883 unsigned U = fieldFromInstruction(Insn, 23, 1);
5884 unsigned P = fieldFromInstruction(Insn, 24, 1);
5885 bool writeback = (W == 1) | (P == 0);
5886
5887 addr |= (U << 8) | (Rn << 9);
5888
5889 if (writeback && (Rn == Rt || Rn == Rt2))
5890 Check(S, MCDisassembler::SoftFail);
5891 if (Rt == Rt2)
5892 Check(S, MCDisassembler::SoftFail);
5893
5894 // Rt
5895 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
5896 return MCDisassembler::Fail;
5897 // Rt2
5898 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder)))
5899 return MCDisassembler::Fail;
5900 // Writeback operand
5901 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
5902 return MCDisassembler::Fail;
5903 // addr
5904 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder)))
5905 return MCDisassembler::Fail;
5906
5907 return S;
5908 }
5909
DecodeT2STRDPreInstruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5910 static DecodeStatus DecodeT2STRDPreInstruction(MCInst &Inst, unsigned Insn,
5911 uint64_t Address,
5912 const MCDisassembler *Decoder) {
5913 DecodeStatus S = MCDisassembler::Success;
5914
5915 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5916 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4);
5917 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5918 unsigned addr = fieldFromInstruction(Insn, 0, 8);
5919 unsigned W = fieldFromInstruction(Insn, 21, 1);
5920 unsigned U = fieldFromInstruction(Insn, 23, 1);
5921 unsigned P = fieldFromInstruction(Insn, 24, 1);
5922 bool writeback = (W == 1) | (P == 0);
5923
5924 addr |= (U << 8) | (Rn << 9);
5925
5926 if (writeback && (Rn == Rt || Rn == Rt2))
5927 Check(S, MCDisassembler::SoftFail);
5928
5929 // Writeback operand
5930 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
5931 return MCDisassembler::Fail;
5932 // Rt
5933 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
5934 return MCDisassembler::Fail;
5935 // Rt2
5936 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder)))
5937 return MCDisassembler::Fail;
5938 // addr
5939 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder)))
5940 return MCDisassembler::Fail;
5941
5942 return S;
5943 }
5944
DecodeT2Adr(MCInst & Inst,uint32_t Insn,uint64_t Address,const MCDisassembler * Decoder)5945 static DecodeStatus DecodeT2Adr(MCInst &Inst, uint32_t Insn, uint64_t Address,
5946 const MCDisassembler *Decoder) {
5947 unsigned sign1 = fieldFromInstruction(Insn, 21, 1);
5948 unsigned sign2 = fieldFromInstruction(Insn, 23, 1);
5949 if (sign1 != sign2) return MCDisassembler::Fail;
5950 const unsigned Rd = fieldFromInstruction(Insn, 8, 4);
5951 assert(Inst.getNumOperands() == 0 && "We should receive an empty Inst");
5952 DecodeStatus S = DecoderGPRRegisterClass(Inst, Rd, Address, Decoder);
5953
5954 unsigned Val = fieldFromInstruction(Insn, 0, 8);
5955 Val |= fieldFromInstruction(Insn, 12, 3) << 8;
5956 Val |= fieldFromInstruction(Insn, 26, 1) << 11;
5957 // If sign, then it is decreasing the address.
5958 if (sign1) {
5959 // Following ARMv7 Architecture Manual, when the offset
5960 // is zero, it is decoded as a subw, not as a adr.w
5961 if (!Val) {
5962 Inst.setOpcode(ARM::t2SUBri12);
5963 Inst.addOperand(MCOperand::createReg(ARM::PC));
5964 } else
5965 Val = -Val;
5966 }
5967 Inst.addOperand(MCOperand::createImm(Val));
5968 return S;
5969 }
5970
DecodeT2ShifterImmOperand(MCInst & Inst,uint32_t Val,uint64_t Address,const MCDisassembler * Decoder)5971 static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, uint32_t Val,
5972 uint64_t Address,
5973 const MCDisassembler *Decoder) {
5974 DecodeStatus S = MCDisassembler::Success;
5975
5976 // Shift of "asr #32" is not allowed in Thumb2 mode.
5977 if (Val == 0x20) S = MCDisassembler::Fail;
5978 Inst.addOperand(MCOperand::createImm(Val));
5979 return S;
5980 }
5981
DecodeSwap(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)5982 static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn, uint64_t Address,
5983 const MCDisassembler *Decoder) {
5984 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
5985 unsigned Rt2 = fieldFromInstruction(Insn, 0, 4);
5986 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
5987 unsigned pred = fieldFromInstruction(Insn, 28, 4);
5988
5989 if (pred == 0xF)
5990 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
5991
5992 DecodeStatus S = MCDisassembler::Success;
5993
5994 if (Rt == Rn || Rn == Rt2)
5995 S = MCDisassembler::SoftFail;
5996
5997 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
5998 return MCDisassembler::Fail;
5999 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder)))
6000 return MCDisassembler::Fail;
6001 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
6002 return MCDisassembler::Fail;
6003 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
6004 return MCDisassembler::Fail;
6005
6006 return S;
6007 }
6008
DecodeVCVTD(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6009 static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn, uint64_t Address,
6010 const MCDisassembler *Decoder) {
6011 const FeatureBitset &featureBits =
6012 ((const MCDisassembler *)Decoder)->getSubtargetInfo().getFeatureBits();
6013 bool hasFullFP16 = featureBits[ARM::FeatureFullFP16];
6014
6015 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0);
6016 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4);
6017 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0);
6018 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4);
6019 unsigned imm = fieldFromInstruction(Insn, 16, 6);
6020 unsigned cmode = fieldFromInstruction(Insn, 8, 4);
6021 unsigned op = fieldFromInstruction(Insn, 5, 1);
6022
6023 DecodeStatus S = MCDisassembler::Success;
6024
6025 // If the top 3 bits of imm are clear, this is a VMOV (immediate)
6026 if (!(imm & 0x38)) {
6027 if (cmode == 0xF) {
6028 if (op == 1) return MCDisassembler::Fail;
6029 Inst.setOpcode(ARM::VMOVv2f32);
6030 }
6031 if (hasFullFP16) {
6032 if (cmode == 0xE) {
6033 if (op == 1) {
6034 Inst.setOpcode(ARM::VMOVv1i64);
6035 } else {
6036 Inst.setOpcode(ARM::VMOVv8i8);
6037 }
6038 }
6039 if (cmode == 0xD) {
6040 if (op == 1) {
6041 Inst.setOpcode(ARM::VMVNv2i32);
6042 } else {
6043 Inst.setOpcode(ARM::VMOVv2i32);
6044 }
6045 }
6046 if (cmode == 0xC) {
6047 if (op == 1) {
6048 Inst.setOpcode(ARM::VMVNv2i32);
6049 } else {
6050 Inst.setOpcode(ARM::VMOVv2i32);
6051 }
6052 }
6053 }
6054 return DecodeVMOVModImmInstruction(Inst, Insn, Address, Decoder);
6055 }
6056
6057 if (!(imm & 0x20)) return MCDisassembler::Fail;
6058
6059 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
6060 return MCDisassembler::Fail;
6061 if (!Check(S, DecodeDPRRegisterClass(Inst, Vm, Address, Decoder)))
6062 return MCDisassembler::Fail;
6063 Inst.addOperand(MCOperand::createImm(64 - imm));
6064
6065 return S;
6066 }
6067
DecodeVCVTQ(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6068 static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn, uint64_t Address,
6069 const MCDisassembler *Decoder) {
6070 const FeatureBitset &featureBits =
6071 ((const MCDisassembler *)Decoder)->getSubtargetInfo().getFeatureBits();
6072 bool hasFullFP16 = featureBits[ARM::FeatureFullFP16];
6073
6074 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0);
6075 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4);
6076 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0);
6077 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4);
6078 unsigned imm = fieldFromInstruction(Insn, 16, 6);
6079 unsigned cmode = fieldFromInstruction(Insn, 8, 4);
6080 unsigned op = fieldFromInstruction(Insn, 5, 1);
6081
6082 DecodeStatus S = MCDisassembler::Success;
6083
6084 // If the top 3 bits of imm are clear, this is a VMOV (immediate)
6085 if (!(imm & 0x38)) {
6086 if (cmode == 0xF) {
6087 if (op == 1) return MCDisassembler::Fail;
6088 Inst.setOpcode(ARM::VMOVv4f32);
6089 }
6090 if (hasFullFP16) {
6091 if (cmode == 0xE) {
6092 if (op == 1) {
6093 Inst.setOpcode(ARM::VMOVv2i64);
6094 } else {
6095 Inst.setOpcode(ARM::VMOVv16i8);
6096 }
6097 }
6098 if (cmode == 0xD) {
6099 if (op == 1) {
6100 Inst.setOpcode(ARM::VMVNv4i32);
6101 } else {
6102 Inst.setOpcode(ARM::VMOVv4i32);
6103 }
6104 }
6105 if (cmode == 0xC) {
6106 if (op == 1) {
6107 Inst.setOpcode(ARM::VMVNv4i32);
6108 } else {
6109 Inst.setOpcode(ARM::VMOVv4i32);
6110 }
6111 }
6112 }
6113 return DecodeVMOVModImmInstruction(Inst, Insn, Address, Decoder);
6114 }
6115
6116 if (!(imm & 0x20)) return MCDisassembler::Fail;
6117
6118 if (!Check(S, DecodeQPRRegisterClass(Inst, Vd, Address, Decoder)))
6119 return MCDisassembler::Fail;
6120 if (!Check(S, DecodeQPRRegisterClass(Inst, Vm, Address, Decoder)))
6121 return MCDisassembler::Fail;
6122 Inst.addOperand(MCOperand::createImm(64 - imm));
6123
6124 return S;
6125 }
6126
6127 static DecodeStatus
DecodeNEONComplexLane64Instruction(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6128 DecodeNEONComplexLane64Instruction(MCInst &Inst, unsigned Insn,
6129 uint64_t Address,
6130 const MCDisassembler *Decoder) {
6131 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0);
6132 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4);
6133 unsigned Vn = (fieldFromInstruction(Insn, 16, 4) << 0);
6134 Vn |= (fieldFromInstruction(Insn, 7, 1) << 4);
6135 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0);
6136 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4);
6137 unsigned q = (fieldFromInstruction(Insn, 6, 1) << 0);
6138 unsigned rotate = (fieldFromInstruction(Insn, 20, 2) << 0);
6139
6140 DecodeStatus S = MCDisassembler::Success;
6141
6142 auto DestRegDecoder = q ? DecodeQPRRegisterClass : DecodeDPRRegisterClass;
6143
6144 if (!Check(S, DestRegDecoder(Inst, Vd, Address, Decoder)))
6145 return MCDisassembler::Fail;
6146 if (!Check(S, DestRegDecoder(Inst, Vd, Address, Decoder)))
6147 return MCDisassembler::Fail;
6148 if (!Check(S, DestRegDecoder(Inst, Vn, Address, Decoder)))
6149 return MCDisassembler::Fail;
6150 if (!Check(S, DecodeDPRRegisterClass(Inst, Vm, Address, Decoder)))
6151 return MCDisassembler::Fail;
6152 // The lane index does not have any bits in the encoding, because it can only
6153 // be 0.
6154 Inst.addOperand(MCOperand::createImm(0));
6155 Inst.addOperand(MCOperand::createImm(rotate));
6156
6157 return S;
6158 }
6159
DecodeLDR(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6160 static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val, uint64_t Address,
6161 const MCDisassembler *Decoder) {
6162 DecodeStatus S = MCDisassembler::Success;
6163
6164 unsigned Rn = fieldFromInstruction(Val, 16, 4);
6165 unsigned Rt = fieldFromInstruction(Val, 12, 4);
6166 unsigned Rm = fieldFromInstruction(Val, 0, 4);
6167 Rm |= (fieldFromInstruction(Val, 23, 1) << 4);
6168 unsigned Cond = fieldFromInstruction(Val, 28, 4);
6169
6170 if (fieldFromInstruction(Val, 8, 4) != 0 || Rn == Rt)
6171 S = MCDisassembler::SoftFail;
6172
6173 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
6174 return MCDisassembler::Fail;
6175 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
6176 return MCDisassembler::Fail;
6177 if (!Check(S, DecodeAddrMode7Operand(Inst, Rn, Address, Decoder)))
6178 return MCDisassembler::Fail;
6179 if (!Check(S, DecodePostIdxReg(Inst, Rm, Address, Decoder)))
6180 return MCDisassembler::Fail;
6181 if (!Check(S, DecodePredicateOperand(Inst, Cond, Address, Decoder)))
6182 return MCDisassembler::Fail;
6183
6184 return S;
6185 }
6186
DecoderForMRRC2AndMCRR2(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6187 static DecodeStatus DecoderForMRRC2AndMCRR2(MCInst &Inst, unsigned Val,
6188 uint64_t Address,
6189 const MCDisassembler *Decoder) {
6190 DecodeStatus S = MCDisassembler::Success;
6191
6192 unsigned CRm = fieldFromInstruction(Val, 0, 4);
6193 unsigned opc1 = fieldFromInstruction(Val, 4, 4);
6194 unsigned cop = fieldFromInstruction(Val, 8, 4);
6195 unsigned Rt = fieldFromInstruction(Val, 12, 4);
6196 unsigned Rt2 = fieldFromInstruction(Val, 16, 4);
6197
6198 if ((cop & ~0x1) == 0xa)
6199 return MCDisassembler::Fail;
6200
6201 if (Rt == Rt2)
6202 S = MCDisassembler::SoftFail;
6203
6204 // We have to check if the instruction is MRRC2
6205 // or MCRR2 when constructing the operands for
6206 // Inst. Reason is because MRRC2 stores to two
6207 // registers so it's tablegen desc has two
6208 // outputs whereas MCRR doesn't store to any
6209 // registers so all of it's operands are listed
6210 // as inputs, therefore the operand order for
6211 // MRRC2 needs to be [Rt, Rt2, cop, opc1, CRm]
6212 // and MCRR2 operand order is [cop, opc1, Rt, Rt2, CRm]
6213
6214 if (Inst.getOpcode() == ARM::MRRC2) {
6215 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
6216 return MCDisassembler::Fail;
6217 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder)))
6218 return MCDisassembler::Fail;
6219 }
6220 Inst.addOperand(MCOperand::createImm(cop));
6221 Inst.addOperand(MCOperand::createImm(opc1));
6222 if (Inst.getOpcode() == ARM::MCRR2) {
6223 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
6224 return MCDisassembler::Fail;
6225 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder)))
6226 return MCDisassembler::Fail;
6227 }
6228 Inst.addOperand(MCOperand::createImm(CRm));
6229
6230 return S;
6231 }
6232
DecodeForVMRSandVMSR(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6233 static DecodeStatus DecodeForVMRSandVMSR(MCInst &Inst, unsigned Val,
6234 uint64_t Address,
6235 const MCDisassembler *Decoder) {
6236 const FeatureBitset &featureBits =
6237 ((const MCDisassembler *)Decoder)->getSubtargetInfo().getFeatureBits();
6238 DecodeStatus S = MCDisassembler::Success;
6239
6240 // Add explicit operand for the destination sysreg, for cases where
6241 // we have to model it for code generation purposes.
6242 switch (Inst.getOpcode()) {
6243 case ARM::VMSR_FPSCR_NZCVQC:
6244 Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
6245 break;
6246 case ARM::VMSR_P0:
6247 Inst.addOperand(MCOperand::createReg(ARM::VPR));
6248 break;
6249 }
6250
6251 if (Inst.getOpcode() != ARM::FMSTAT) {
6252 unsigned Rt = fieldFromInstruction(Val, 12, 4);
6253
6254 if (featureBits[ARM::ModeThumb] && !featureBits[ARM::HasV8Ops]) {
6255 if (Rt == 13 || Rt == 15)
6256 S = MCDisassembler::SoftFail;
6257 Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder));
6258 } else
6259 Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder));
6260 }
6261
6262 // Add explicit operand for the source sysreg, similarly to above.
6263 switch (Inst.getOpcode()) {
6264 case ARM::VMRS_FPSCR_NZCVQC:
6265 Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
6266 break;
6267 case ARM::VMRS_P0:
6268 Inst.addOperand(MCOperand::createReg(ARM::VPR));
6269 break;
6270 }
6271
6272 if (featureBits[ARM::ModeThumb]) {
6273 Inst.addOperand(MCOperand::createImm(ARMCC::AL));
6274 Inst.addOperand(MCOperand::createReg(0));
6275 } else {
6276 unsigned pred = fieldFromInstruction(Val, 28, 4);
6277 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
6278 return MCDisassembler::Fail;
6279 }
6280
6281 return S;
6282 }
6283
6284 template <bool isSigned, bool isNeg, bool zeroPermitted, int size>
DecodeBFLabelOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6285 static DecodeStatus DecodeBFLabelOperand(MCInst &Inst, unsigned Val,
6286 uint64_t Address,
6287 const MCDisassembler *Decoder) {
6288 DecodeStatus S = MCDisassembler::Success;
6289 if (Val == 0 && !zeroPermitted)
6290 S = MCDisassembler::Fail;
6291
6292 uint64_t DecVal;
6293 if (isSigned)
6294 DecVal = SignExtend32<size + 1>(Val << 1);
6295 else
6296 DecVal = (Val << 1);
6297
6298 if (!tryAddingSymbolicOperand(Address, Address + DecVal + 4, true, 4, Inst,
6299 Decoder))
6300 Inst.addOperand(MCOperand::createImm(isNeg ? -DecVal : DecVal));
6301 return S;
6302 }
6303
DecodeBFAfterTargetOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6304 static DecodeStatus DecodeBFAfterTargetOperand(MCInst &Inst, unsigned Val,
6305 uint64_t Address,
6306 const MCDisassembler *Decoder) {
6307
6308 uint64_t LocImm = Inst.getOperand(0).getImm();
6309 Val = LocImm + (2 << Val);
6310 if (!tryAddingSymbolicOperand(Address, Address + Val + 4, true, 4, Inst,
6311 Decoder))
6312 Inst.addOperand(MCOperand::createImm(Val));
6313 return MCDisassembler::Success;
6314 }
6315
DecodePredNoALOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6316 static DecodeStatus DecodePredNoALOperand(MCInst &Inst, unsigned Val,
6317 uint64_t Address,
6318 const MCDisassembler *Decoder) {
6319 if (Val >= ARMCC::AL) // also exclude the non-condition NV
6320 return MCDisassembler::Fail;
6321 Inst.addOperand(MCOperand::createImm(Val));
6322 return MCDisassembler::Success;
6323 }
6324
DecodeLOLoop(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6325 static DecodeStatus DecodeLOLoop(MCInst &Inst, unsigned Insn, uint64_t Address,
6326 const MCDisassembler *Decoder) {
6327 DecodeStatus S = MCDisassembler::Success;
6328
6329 if (Inst.getOpcode() == ARM::MVE_LCTP)
6330 return S;
6331
6332 unsigned Imm = fieldFromInstruction(Insn, 11, 1) |
6333 fieldFromInstruction(Insn, 1, 10) << 1;
6334 switch (Inst.getOpcode()) {
6335 case ARM::t2LEUpdate:
6336 case ARM::MVE_LETP:
6337 Inst.addOperand(MCOperand::createReg(ARM::LR));
6338 Inst.addOperand(MCOperand::createReg(ARM::LR));
6339 [[fallthrough]];
6340 case ARM::t2LE:
6341 if (!Check(S, DecodeBFLabelOperand<false, true, true, 11>(
6342 Inst, Imm, Address, Decoder)))
6343 return MCDisassembler::Fail;
6344 break;
6345 case ARM::t2WLS:
6346 case ARM::MVE_WLSTP_8:
6347 case ARM::MVE_WLSTP_16:
6348 case ARM::MVE_WLSTP_32:
6349 case ARM::MVE_WLSTP_64:
6350 Inst.addOperand(MCOperand::createReg(ARM::LR));
6351 if (!Check(S,
6352 DecoderGPRRegisterClass(Inst, fieldFromInstruction(Insn, 16, 4),
6353 Address, Decoder)) ||
6354 !Check(S, DecodeBFLabelOperand<false, false, true, 11>(
6355 Inst, Imm, Address, Decoder)))
6356 return MCDisassembler::Fail;
6357 break;
6358 case ARM::t2DLS:
6359 case ARM::MVE_DLSTP_8:
6360 case ARM::MVE_DLSTP_16:
6361 case ARM::MVE_DLSTP_32:
6362 case ARM::MVE_DLSTP_64:
6363 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
6364 if (Rn == 0xF) {
6365 // Enforce all the rest of the instruction bits in LCTP, which
6366 // won't have been reliably checked based on LCTP's own tablegen
6367 // record, because we came to this decode by a roundabout route.
6368 uint32_t CanonicalLCTP = 0xF00FE001, SBZMask = 0x00300FFE;
6369 if ((Insn & ~SBZMask) != CanonicalLCTP)
6370 return MCDisassembler::Fail; // a mandatory bit is wrong: hard fail
6371 if (Insn != CanonicalLCTP)
6372 Check(S, MCDisassembler::SoftFail); // an SBZ bit is wrong: soft fail
6373
6374 Inst.setOpcode(ARM::MVE_LCTP);
6375 } else {
6376 Inst.addOperand(MCOperand::createReg(ARM::LR));
6377 if (!Check(S, DecoderGPRRegisterClass(Inst,
6378 fieldFromInstruction(Insn, 16, 4),
6379 Address, Decoder)))
6380 return MCDisassembler::Fail;
6381 }
6382 break;
6383 }
6384 return S;
6385 }
6386
DecodeLongShiftOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6387 static DecodeStatus DecodeLongShiftOperand(MCInst &Inst, unsigned Val,
6388 uint64_t Address,
6389 const MCDisassembler *Decoder) {
6390 DecodeStatus S = MCDisassembler::Success;
6391
6392 if (Val == 0)
6393 Val = 32;
6394
6395 Inst.addOperand(MCOperand::createImm(Val));
6396
6397 return S;
6398 }
6399
DecodetGPROddRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)6400 static DecodeStatus DecodetGPROddRegisterClass(MCInst &Inst, unsigned RegNo,
6401 uint64_t Address,
6402 const MCDisassembler *Decoder) {
6403 if ((RegNo) + 1 > 11)
6404 return MCDisassembler::Fail;
6405
6406 unsigned Register = GPRDecoderTable[(RegNo) + 1];
6407 Inst.addOperand(MCOperand::createReg(Register));
6408 return MCDisassembler::Success;
6409 }
6410
DecodetGPREvenRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)6411 static DecodeStatus DecodetGPREvenRegisterClass(MCInst &Inst, unsigned RegNo,
6412 uint64_t Address,
6413 const MCDisassembler *Decoder) {
6414 if ((RegNo) > 14)
6415 return MCDisassembler::Fail;
6416
6417 unsigned Register = GPRDecoderTable[(RegNo)];
6418 Inst.addOperand(MCOperand::createReg(Register));
6419 return MCDisassembler::Success;
6420 }
6421
6422 static DecodeStatus
DecodeGPRwithAPSR_NZCVnospRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)6423 DecodeGPRwithAPSR_NZCVnospRegisterClass(MCInst &Inst, unsigned RegNo,
6424 uint64_t Address,
6425 const MCDisassembler *Decoder) {
6426 if (RegNo == 15) {
6427 Inst.addOperand(MCOperand::createReg(ARM::APSR_NZCV));
6428 return MCDisassembler::Success;
6429 }
6430
6431 unsigned Register = GPRDecoderTable[RegNo];
6432 Inst.addOperand(MCOperand::createReg(Register));
6433
6434 if (RegNo == 13)
6435 return MCDisassembler::SoftFail;
6436
6437 return MCDisassembler::Success;
6438 }
6439
DecodeVSCCLRM(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6440 static DecodeStatus DecodeVSCCLRM(MCInst &Inst, unsigned Insn, uint64_t Address,
6441 const MCDisassembler *Decoder) {
6442 DecodeStatus S = MCDisassembler::Success;
6443
6444 Inst.addOperand(MCOperand::createImm(ARMCC::AL));
6445 Inst.addOperand(MCOperand::createReg(0));
6446 if (Inst.getOpcode() == ARM::VSCCLRMD) {
6447 unsigned reglist = (fieldFromInstruction(Insn, 1, 7) << 1) |
6448 (fieldFromInstruction(Insn, 12, 4) << 8) |
6449 (fieldFromInstruction(Insn, 22, 1) << 12);
6450 if (!Check(S, DecodeDPRRegListOperand(Inst, reglist, Address, Decoder))) {
6451 return MCDisassembler::Fail;
6452 }
6453 } else {
6454 unsigned reglist = fieldFromInstruction(Insn, 0, 8) |
6455 (fieldFromInstruction(Insn, 22, 1) << 8) |
6456 (fieldFromInstruction(Insn, 12, 4) << 9);
6457 if (!Check(S, DecodeSPRRegListOperand(Inst, reglist, Address, Decoder))) {
6458 return MCDisassembler::Fail;
6459 }
6460 }
6461 Inst.addOperand(MCOperand::createReg(ARM::VPR));
6462
6463 return S;
6464 }
6465
DecodeMQPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)6466 static DecodeStatus DecodeMQPRRegisterClass(MCInst &Inst, unsigned RegNo,
6467 uint64_t Address,
6468 const MCDisassembler *Decoder) {
6469 if (RegNo > 7)
6470 return MCDisassembler::Fail;
6471
6472 unsigned Register = QPRDecoderTable[RegNo];
6473 Inst.addOperand(MCOperand::createReg(Register));
6474 return MCDisassembler::Success;
6475 }
6476
6477 static const uint16_t QQPRDecoderTable[] = {
6478 ARM::Q0_Q1, ARM::Q1_Q2, ARM::Q2_Q3, ARM::Q3_Q4,
6479 ARM::Q4_Q5, ARM::Q5_Q6, ARM::Q6_Q7
6480 };
6481
DecodeMQQPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)6482 static DecodeStatus DecodeMQQPRRegisterClass(MCInst &Inst, unsigned RegNo,
6483 uint64_t Address,
6484 const MCDisassembler *Decoder) {
6485 if (RegNo > 6)
6486 return MCDisassembler::Fail;
6487
6488 unsigned Register = QQPRDecoderTable[RegNo];
6489 Inst.addOperand(MCOperand::createReg(Register));
6490 return MCDisassembler::Success;
6491 }
6492
6493 static const uint16_t QQQQPRDecoderTable[] = {
6494 ARM::Q0_Q1_Q2_Q3, ARM::Q1_Q2_Q3_Q4, ARM::Q2_Q3_Q4_Q5,
6495 ARM::Q3_Q4_Q5_Q6, ARM::Q4_Q5_Q6_Q7
6496 };
6497
DecodeMQQQQPRRegisterClass(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)6498 static DecodeStatus DecodeMQQQQPRRegisterClass(MCInst &Inst, unsigned RegNo,
6499 uint64_t Address,
6500 const MCDisassembler *Decoder) {
6501 if (RegNo > 4)
6502 return MCDisassembler::Fail;
6503
6504 unsigned Register = QQQQPRDecoderTable[RegNo];
6505 Inst.addOperand(MCOperand::createReg(Register));
6506 return MCDisassembler::Success;
6507 }
6508
DecodeVPTMaskOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6509 static DecodeStatus DecodeVPTMaskOperand(MCInst &Inst, unsigned Val,
6510 uint64_t Address,
6511 const MCDisassembler *Decoder) {
6512 DecodeStatus S = MCDisassembler::Success;
6513
6514 // Parse VPT mask and encode it in the MCInst as an immediate with the same
6515 // format as the it_mask. That is, from the second 'e|t' encode 'e' as 1 and
6516 // 't' as 0 and finish with a 1.
6517 unsigned Imm = 0;
6518 // We always start with a 't'.
6519 unsigned CurBit = 0;
6520 for (int i = 3; i >= 0; --i) {
6521 // If the bit we are looking at is not the same as last one, invert the
6522 // CurBit, if it is the same leave it as is.
6523 CurBit ^= (Val >> i) & 1U;
6524
6525 // Encode the CurBit at the right place in the immediate.
6526 Imm |= (CurBit << i);
6527
6528 // If we are done, finish the encoding with a 1.
6529 if ((Val & ~(~0U << i)) == 0) {
6530 Imm |= 1U << i;
6531 break;
6532 }
6533 }
6534
6535 Inst.addOperand(MCOperand::createImm(Imm));
6536
6537 return S;
6538 }
6539
DecodeVpredROperand(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)6540 static DecodeStatus DecodeVpredROperand(MCInst &Inst, unsigned RegNo,
6541 uint64_t Address,
6542 const MCDisassembler *Decoder) {
6543 // The vpred_r operand type includes an MQPR register field derived
6544 // from the encoding. But we don't actually want to add an operand
6545 // to the MCInst at this stage, because AddThumbPredicate will do it
6546 // later, and will infer the register number from the TIED_TO
6547 // constraint. So this is a deliberately empty decoder method that
6548 // will inhibit the auto-generated disassembly code from adding an
6549 // operand at all.
6550 return MCDisassembler::Success;
6551 }
6552
6553 [[maybe_unused]] static DecodeStatus
DecodeVpredNOperand(MCInst & Inst,unsigned RegNo,uint64_t Address,const MCDisassembler * Decoder)6554 DecodeVpredNOperand(MCInst &Inst, unsigned RegNo, uint64_t Address,
6555 const MCDisassembler *Decoder) {
6556 // Similar to above, we want to ensure that no operands are added for the
6557 // vpred operands. (This is marked "maybe_unused" for the moment; because
6558 // DecoderEmitter currently (wrongly) omits operands with no instruction bits,
6559 // the decoder doesn't actually call it yet. That will be addressed in a
6560 // future change.)
6561 return MCDisassembler::Success;
6562 }
6563
6564 static DecodeStatus
DecodeRestrictedIPredicateOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6565 DecodeRestrictedIPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
6566 const MCDisassembler *Decoder) {
6567 Inst.addOperand(MCOperand::createImm((Val & 0x1) == 0 ? ARMCC::EQ : ARMCC::NE));
6568 return MCDisassembler::Success;
6569 }
6570
6571 static DecodeStatus
DecodeRestrictedSPredicateOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6572 DecodeRestrictedSPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
6573 const MCDisassembler *Decoder) {
6574 unsigned Code;
6575 switch (Val & 0x3) {
6576 case 0:
6577 Code = ARMCC::GE;
6578 break;
6579 case 1:
6580 Code = ARMCC::LT;
6581 break;
6582 case 2:
6583 Code = ARMCC::GT;
6584 break;
6585 case 3:
6586 Code = ARMCC::LE;
6587 break;
6588 }
6589 Inst.addOperand(MCOperand::createImm(Code));
6590 return MCDisassembler::Success;
6591 }
6592
6593 static DecodeStatus
DecodeRestrictedUPredicateOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6594 DecodeRestrictedUPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
6595 const MCDisassembler *Decoder) {
6596 Inst.addOperand(MCOperand::createImm((Val & 0x1) == 0 ? ARMCC::HS : ARMCC::HI));
6597 return MCDisassembler::Success;
6598 }
6599
6600 static DecodeStatus
DecodeRestrictedFPPredicateOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6601 DecodeRestrictedFPPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
6602 const MCDisassembler *Decoder) {
6603 unsigned Code;
6604 switch (Val) {
6605 default:
6606 return MCDisassembler::Fail;
6607 case 0:
6608 Code = ARMCC::EQ;
6609 break;
6610 case 1:
6611 Code = ARMCC::NE;
6612 break;
6613 case 4:
6614 Code = ARMCC::GE;
6615 break;
6616 case 5:
6617 Code = ARMCC::LT;
6618 break;
6619 case 6:
6620 Code = ARMCC::GT;
6621 break;
6622 case 7:
6623 Code = ARMCC::LE;
6624 break;
6625 }
6626
6627 Inst.addOperand(MCOperand::createImm(Code));
6628 return MCDisassembler::Success;
6629 }
6630
DecodeVCVTImmOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6631 static DecodeStatus DecodeVCVTImmOperand(MCInst &Inst, unsigned Val,
6632 uint64_t Address,
6633 const MCDisassembler *Decoder) {
6634 DecodeStatus S = MCDisassembler::Success;
6635
6636 unsigned DecodedVal = 64 - Val;
6637
6638 switch (Inst.getOpcode()) {
6639 case ARM::MVE_VCVTf16s16_fix:
6640 case ARM::MVE_VCVTs16f16_fix:
6641 case ARM::MVE_VCVTf16u16_fix:
6642 case ARM::MVE_VCVTu16f16_fix:
6643 if (DecodedVal > 16)
6644 return MCDisassembler::Fail;
6645 break;
6646 case ARM::MVE_VCVTf32s32_fix:
6647 case ARM::MVE_VCVTs32f32_fix:
6648 case ARM::MVE_VCVTf32u32_fix:
6649 case ARM::MVE_VCVTu32f32_fix:
6650 if (DecodedVal > 32)
6651 return MCDisassembler::Fail;
6652 break;
6653 }
6654
6655 Inst.addOperand(MCOperand::createImm(64 - Val));
6656
6657 return S;
6658 }
6659
FixedRegForVSTRVLDR_SYSREG(unsigned Opcode)6660 static unsigned FixedRegForVSTRVLDR_SYSREG(unsigned Opcode) {
6661 switch (Opcode) {
6662 case ARM::VSTR_P0_off:
6663 case ARM::VSTR_P0_pre:
6664 case ARM::VSTR_P0_post:
6665 case ARM::VLDR_P0_off:
6666 case ARM::VLDR_P0_pre:
6667 case ARM::VLDR_P0_post:
6668 return ARM::P0;
6669 default:
6670 return 0;
6671 }
6672 }
6673
6674 template <bool Writeback>
DecodeVSTRVLDR_SYSREG(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6675 static DecodeStatus DecodeVSTRVLDR_SYSREG(MCInst &Inst, unsigned Val,
6676 uint64_t Address,
6677 const MCDisassembler *Decoder) {
6678 switch (Inst.getOpcode()) {
6679 case ARM::VSTR_FPSCR_pre:
6680 case ARM::VSTR_FPSCR_NZCVQC_pre:
6681 case ARM::VLDR_FPSCR_pre:
6682 case ARM::VLDR_FPSCR_NZCVQC_pre:
6683 case ARM::VSTR_FPSCR_off:
6684 case ARM::VSTR_FPSCR_NZCVQC_off:
6685 case ARM::VLDR_FPSCR_off:
6686 case ARM::VLDR_FPSCR_NZCVQC_off:
6687 case ARM::VSTR_FPSCR_post:
6688 case ARM::VSTR_FPSCR_NZCVQC_post:
6689 case ARM::VLDR_FPSCR_post:
6690 case ARM::VLDR_FPSCR_NZCVQC_post:
6691 const FeatureBitset &featureBits =
6692 ((const MCDisassembler *)Decoder)->getSubtargetInfo().getFeatureBits();
6693
6694 if (!featureBits[ARM::HasMVEIntegerOps] && !featureBits[ARM::FeatureVFP2])
6695 return MCDisassembler::Fail;
6696 }
6697
6698 DecodeStatus S = MCDisassembler::Success;
6699 if (unsigned Sysreg = FixedRegForVSTRVLDR_SYSREG(Inst.getOpcode()))
6700 Inst.addOperand(MCOperand::createReg(Sysreg));
6701 unsigned Rn = fieldFromInstruction(Val, 16, 4);
6702 unsigned addr = fieldFromInstruction(Val, 0, 7) |
6703 (fieldFromInstruction(Val, 23, 1) << 7) | (Rn << 8);
6704
6705 if (Writeback) {
6706 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
6707 return MCDisassembler::Fail;
6708 }
6709 if (!Check(S, DecodeT2AddrModeImm7s4(Inst, addr, Address, Decoder)))
6710 return MCDisassembler::Fail;
6711
6712 Inst.addOperand(MCOperand::createImm(ARMCC::AL));
6713 Inst.addOperand(MCOperand::createReg(0));
6714
6715 return S;
6716 }
6717
6718 static inline DecodeStatus
DecodeMVE_MEM_pre(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder,unsigned Rn,OperandDecoder RnDecoder,OperandDecoder AddrDecoder)6719 DecodeMVE_MEM_pre(MCInst &Inst, unsigned Val, uint64_t Address,
6720 const MCDisassembler *Decoder, unsigned Rn,
6721 OperandDecoder RnDecoder, OperandDecoder AddrDecoder) {
6722 DecodeStatus S = MCDisassembler::Success;
6723
6724 unsigned Qd = fieldFromInstruction(Val, 13, 3);
6725 unsigned addr = fieldFromInstruction(Val, 0, 7) |
6726 (fieldFromInstruction(Val, 23, 1) << 7) | (Rn << 8);
6727
6728 if (!Check(S, RnDecoder(Inst, Rn, Address, Decoder)))
6729 return MCDisassembler::Fail;
6730 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
6731 return MCDisassembler::Fail;
6732 if (!Check(S, AddrDecoder(Inst, addr, Address, Decoder)))
6733 return MCDisassembler::Fail;
6734
6735 return S;
6736 }
6737
6738 template <int shift>
DecodeMVE_MEM_1_pre(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6739 static DecodeStatus DecodeMVE_MEM_1_pre(MCInst &Inst, unsigned Val,
6740 uint64_t Address,
6741 const MCDisassembler *Decoder) {
6742 return DecodeMVE_MEM_pre(Inst, Val, Address, Decoder,
6743 fieldFromInstruction(Val, 16, 3),
6744 DecodetGPRRegisterClass,
6745 DecodeTAddrModeImm7<shift>);
6746 }
6747
6748 template <int shift>
DecodeMVE_MEM_2_pre(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6749 static DecodeStatus DecodeMVE_MEM_2_pre(MCInst &Inst, unsigned Val,
6750 uint64_t Address,
6751 const MCDisassembler *Decoder) {
6752 return DecodeMVE_MEM_pre(Inst, Val, Address, Decoder,
6753 fieldFromInstruction(Val, 16, 4),
6754 DecoderGPRRegisterClass,
6755 DecodeT2AddrModeImm7<shift,1>);
6756 }
6757
6758 template <int shift>
DecodeMVE_MEM_3_pre(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6759 static DecodeStatus DecodeMVE_MEM_3_pre(MCInst &Inst, unsigned Val,
6760 uint64_t Address,
6761 const MCDisassembler *Decoder) {
6762 return DecodeMVE_MEM_pre(Inst, Val, Address, Decoder,
6763 fieldFromInstruction(Val, 17, 3),
6764 DecodeMQPRRegisterClass,
6765 DecodeMveAddrModeQ<shift>);
6766 }
6767
6768 template <unsigned MinLog, unsigned MaxLog>
DecodePowerTwoOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6769 static DecodeStatus DecodePowerTwoOperand(MCInst &Inst, unsigned Val,
6770 uint64_t Address,
6771 const MCDisassembler *Decoder) {
6772 DecodeStatus S = MCDisassembler::Success;
6773
6774 if (Val < MinLog || Val > MaxLog)
6775 return MCDisassembler::Fail;
6776
6777 Inst.addOperand(MCOperand::createImm(1LL << Val));
6778 return S;
6779 }
6780
6781 template <unsigned start>
6782 static DecodeStatus
DecodeMVEPairVectorIndexOperand(MCInst & Inst,unsigned Val,uint64_t Address,const MCDisassembler * Decoder)6783 DecodeMVEPairVectorIndexOperand(MCInst &Inst, unsigned Val, uint64_t Address,
6784 const MCDisassembler *Decoder) {
6785 DecodeStatus S = MCDisassembler::Success;
6786
6787 Inst.addOperand(MCOperand::createImm(start + Val));
6788
6789 return S;
6790 }
6791
DecodeMVEVMOVQtoDReg(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6792 static DecodeStatus DecodeMVEVMOVQtoDReg(MCInst &Inst, unsigned Insn,
6793 uint64_t Address,
6794 const MCDisassembler *Decoder) {
6795 DecodeStatus S = MCDisassembler::Success;
6796 unsigned Rt = fieldFromInstruction(Insn, 0, 4);
6797 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
6798 unsigned Qd = ((fieldFromInstruction(Insn, 22, 1) << 3) |
6799 fieldFromInstruction(Insn, 13, 3));
6800 unsigned index = fieldFromInstruction(Insn, 4, 1);
6801
6802 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
6803 return MCDisassembler::Fail;
6804 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2, Address, Decoder)))
6805 return MCDisassembler::Fail;
6806 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
6807 return MCDisassembler::Fail;
6808 if (!Check(S, DecodeMVEPairVectorIndexOperand<2>(Inst, index, Address, Decoder)))
6809 return MCDisassembler::Fail;
6810 if (!Check(S, DecodeMVEPairVectorIndexOperand<0>(Inst, index, Address, Decoder)))
6811 return MCDisassembler::Fail;
6812
6813 return S;
6814 }
6815
DecodeMVEVMOVDRegtoQ(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6816 static DecodeStatus DecodeMVEVMOVDRegtoQ(MCInst &Inst, unsigned Insn,
6817 uint64_t Address,
6818 const MCDisassembler *Decoder) {
6819 DecodeStatus S = MCDisassembler::Success;
6820 unsigned Rt = fieldFromInstruction(Insn, 0, 4);
6821 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
6822 unsigned Qd = ((fieldFromInstruction(Insn, 22, 1) << 3) |
6823 fieldFromInstruction(Insn, 13, 3));
6824 unsigned index = fieldFromInstruction(Insn, 4, 1);
6825
6826 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
6827 return MCDisassembler::Fail;
6828 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
6829 return MCDisassembler::Fail;
6830 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
6831 return MCDisassembler::Fail;
6832 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2, Address, Decoder)))
6833 return MCDisassembler::Fail;
6834 if (!Check(S, DecodeMVEPairVectorIndexOperand<2>(Inst, index, Address, Decoder)))
6835 return MCDisassembler::Fail;
6836 if (!Check(S, DecodeMVEPairVectorIndexOperand<0>(Inst, index, Address, Decoder)))
6837 return MCDisassembler::Fail;
6838
6839 return S;
6840 }
6841
6842 static DecodeStatus
DecodeMVEOverlappingLongShift(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6843 DecodeMVEOverlappingLongShift(MCInst &Inst, unsigned Insn, uint64_t Address,
6844 const MCDisassembler *Decoder) {
6845 DecodeStatus S = MCDisassembler::Success;
6846
6847 unsigned RdaLo = fieldFromInstruction(Insn, 17, 3) << 1;
6848 unsigned RdaHi = fieldFromInstruction(Insn, 9, 3) << 1;
6849 unsigned Rm = fieldFromInstruction(Insn, 12, 4);
6850
6851 if (RdaHi == 14) {
6852 // This value of RdaHi (really indicating pc, because RdaHi has to
6853 // be an odd-numbered register, so the low bit will be set by the
6854 // decode function below) indicates that we must decode as SQRSHR
6855 // or UQRSHL, which both have a single Rda register field with all
6856 // four bits.
6857 unsigned Rda = fieldFromInstruction(Insn, 16, 4);
6858
6859 switch (Inst.getOpcode()) {
6860 case ARM::MVE_ASRLr:
6861 case ARM::MVE_SQRSHRL:
6862 Inst.setOpcode(ARM::MVE_SQRSHR);
6863 break;
6864 case ARM::MVE_LSLLr:
6865 case ARM::MVE_UQRSHLL:
6866 Inst.setOpcode(ARM::MVE_UQRSHL);
6867 break;
6868 default:
6869 llvm_unreachable("Unexpected starting opcode!");
6870 }
6871
6872 // Rda as output parameter
6873 if (!Check(S, DecoderGPRRegisterClass(Inst, Rda, Address, Decoder)))
6874 return MCDisassembler::Fail;
6875
6876 // Rda again as input parameter
6877 if (!Check(S, DecoderGPRRegisterClass(Inst, Rda, Address, Decoder)))
6878 return MCDisassembler::Fail;
6879
6880 // Rm, the amount to shift by
6881 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
6882 return MCDisassembler::Fail;
6883
6884 if (fieldFromInstruction (Insn, 6, 3) != 4)
6885 return MCDisassembler::SoftFail;
6886
6887 if (Rda == Rm)
6888 return MCDisassembler::SoftFail;
6889
6890 return S;
6891 }
6892
6893 // Otherwise, we decode as whichever opcode our caller has already
6894 // put into Inst. Those all look the same:
6895
6896 // RdaLo,RdaHi as output parameters
6897 if (!Check(S, DecodetGPREvenRegisterClass(Inst, RdaLo, Address, Decoder)))
6898 return MCDisassembler::Fail;
6899 if (!Check(S, DecodetGPROddRegisterClass(Inst, RdaHi, Address, Decoder)))
6900 return MCDisassembler::Fail;
6901
6902 // RdaLo,RdaHi again as input parameters
6903 if (!Check(S, DecodetGPREvenRegisterClass(Inst, RdaLo, Address, Decoder)))
6904 return MCDisassembler::Fail;
6905 if (!Check(S, DecodetGPROddRegisterClass(Inst, RdaHi, Address, Decoder)))
6906 return MCDisassembler::Fail;
6907
6908 // Rm, the amount to shift by
6909 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
6910 return MCDisassembler::Fail;
6911
6912 if (Inst.getOpcode() == ARM::MVE_SQRSHRL ||
6913 Inst.getOpcode() == ARM::MVE_UQRSHLL) {
6914 unsigned Saturate = fieldFromInstruction(Insn, 7, 1);
6915 // Saturate, the bit position for saturation
6916 Inst.addOperand(MCOperand::createImm(Saturate));
6917 }
6918
6919 return S;
6920 }
6921
DecodeMVEVCVTt1fp(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6922 static DecodeStatus DecodeMVEVCVTt1fp(MCInst &Inst, unsigned Insn,
6923 uint64_t Address,
6924 const MCDisassembler *Decoder) {
6925 DecodeStatus S = MCDisassembler::Success;
6926 unsigned Qd = ((fieldFromInstruction(Insn, 22, 1) << 3) |
6927 fieldFromInstruction(Insn, 13, 3));
6928 unsigned Qm = ((fieldFromInstruction(Insn, 5, 1) << 3) |
6929 fieldFromInstruction(Insn, 1, 3));
6930 unsigned imm6 = fieldFromInstruction(Insn, 16, 6);
6931
6932 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
6933 return MCDisassembler::Fail;
6934 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
6935 return MCDisassembler::Fail;
6936 if (!Check(S, DecodeVCVTImmOperand(Inst, imm6, Address, Decoder)))
6937 return MCDisassembler::Fail;
6938
6939 return S;
6940 }
6941
6942 template <bool scalar, OperandDecoder predicate_decoder>
DecodeMVEVCMP(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6943 static DecodeStatus DecodeMVEVCMP(MCInst &Inst, unsigned Insn, uint64_t Address,
6944 const MCDisassembler *Decoder) {
6945 DecodeStatus S = MCDisassembler::Success;
6946 Inst.addOperand(MCOperand::createReg(ARM::VPR));
6947 unsigned Qn = fieldFromInstruction(Insn, 17, 3);
6948 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qn, Address, Decoder)))
6949 return MCDisassembler::Fail;
6950
6951 unsigned fc;
6952
6953 if (scalar) {
6954 fc = fieldFromInstruction(Insn, 12, 1) << 2 |
6955 fieldFromInstruction(Insn, 7, 1) |
6956 fieldFromInstruction(Insn, 5, 1) << 1;
6957 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
6958 if (!Check(S, DecodeGPRwithZRRegisterClass(Inst, Rm, Address, Decoder)))
6959 return MCDisassembler::Fail;
6960 } else {
6961 fc = fieldFromInstruction(Insn, 12, 1) << 2 |
6962 fieldFromInstruction(Insn, 7, 1) |
6963 fieldFromInstruction(Insn, 0, 1) << 1;
6964 unsigned Qm = fieldFromInstruction(Insn, 5, 1) << 4 |
6965 fieldFromInstruction(Insn, 1, 3);
6966 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
6967 return MCDisassembler::Fail;
6968 }
6969
6970 if (!Check(S, predicate_decoder(Inst, fc, Address, Decoder)))
6971 return MCDisassembler::Fail;
6972
6973 Inst.addOperand(MCOperand::createImm(ARMVCC::None));
6974 Inst.addOperand(MCOperand::createReg(0));
6975 Inst.addOperand(MCOperand::createImm(0));
6976
6977 return S;
6978 }
6979
DecodeMveVCTP(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6980 static DecodeStatus DecodeMveVCTP(MCInst &Inst, unsigned Insn, uint64_t Address,
6981 const MCDisassembler *Decoder) {
6982 DecodeStatus S = MCDisassembler::Success;
6983 Inst.addOperand(MCOperand::createReg(ARM::VPR));
6984 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
6985 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
6986 return MCDisassembler::Fail;
6987 return S;
6988 }
6989
DecodeMVEVPNOT(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6990 static DecodeStatus DecodeMVEVPNOT(MCInst &Inst, unsigned Insn,
6991 uint64_t Address,
6992 const MCDisassembler *Decoder) {
6993 DecodeStatus S = MCDisassembler::Success;
6994 Inst.addOperand(MCOperand::createReg(ARM::VPR));
6995 Inst.addOperand(MCOperand::createReg(ARM::VPR));
6996 return S;
6997 }
6998
DecodeT2AddSubSPImm(MCInst & Inst,unsigned Insn,uint64_t Address,const MCDisassembler * Decoder)6999 static DecodeStatus DecodeT2AddSubSPImm(MCInst &Inst, unsigned Insn,
7000 uint64_t Address,
7001 const MCDisassembler *Decoder) {
7002 const unsigned Rd = fieldFromInstruction(Insn, 8, 4);
7003 const unsigned Rn = fieldFromInstruction(Insn, 16, 4);
7004 const unsigned Imm12 = fieldFromInstruction(Insn, 26, 1) << 11 |
7005 fieldFromInstruction(Insn, 12, 3) << 8 |
7006 fieldFromInstruction(Insn, 0, 8);
7007 const unsigned TypeT3 = fieldFromInstruction(Insn, 25, 1);
7008 unsigned sign1 = fieldFromInstruction(Insn, 21, 1);
7009 unsigned sign2 = fieldFromInstruction(Insn, 23, 1);
7010 unsigned S = fieldFromInstruction(Insn, 20, 1);
7011 if (sign1 != sign2)
7012 return MCDisassembler::Fail;
7013
7014 // T3 does a zext of imm12, where T2 does a ThumbExpandImm (T2SOImm)
7015 DecodeStatus DS = MCDisassembler::Success;
7016 if ((!Check(DS,
7017 DecodeGPRspRegisterClass(Inst, Rd, Address, Decoder))) || // dst
7018 (!Check(DS, DecodeGPRspRegisterClass(Inst, Rn, Address, Decoder))))
7019 return MCDisassembler::Fail;
7020 if (TypeT3) {
7021 Inst.setOpcode(sign1 ? ARM::t2SUBspImm12 : ARM::t2ADDspImm12);
7022 Inst.addOperand(MCOperand::createImm(Imm12)); // zext imm12
7023 } else {
7024 Inst.setOpcode(sign1 ? ARM::t2SUBspImm : ARM::t2ADDspImm);
7025 if (!Check(DS, DecodeT2SOImm(Inst, Imm12, Address, Decoder))) // imm12
7026 return MCDisassembler::Fail;
7027 if (!Check(DS, DecodeCCOutOperand(Inst, S, Address, Decoder))) // cc_out
7028 return MCDisassembler::Fail;
7029 }
7030
7031 return DS;
7032 }
7033