LLVM  13.0.0git
ARMDisassembler.cpp
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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/MCDisassembler/MCDisassembler.h"
17 #include "llvm/MC/MCFixedLenDisassembler.h"
18 #include "llvm/MC/MCInst.h"
19 #include "llvm/MC/MCInstrDesc.h"
20 #include "llvm/MC/MCSubtargetInfo.h"
21 #include "llvm/MC/SubtargetFeature.h"
22 #include "llvm/Support/Compiler.h"
23 #include "llvm/Support/ErrorHandling.h"
24 #include "llvm/Support/MathExtras.h"
25 #include "llvm/Support/TargetRegistry.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include <algorithm>
28 #include <cassert>
29 #include <cstdint>
30 #include <vector>
31 
32 using namespace llvm;
33 
34 #define DEBUG_TYPE "arm-disassembler"
35 
36 using DecodeStatus = MCDisassembler::DecodeStatus;
37 
38 namespace {
39 
40  // Handles the condition code status of instructions in IT blocks
41  class ITStatus
42  {
43  public:
44  // Returns the condition code for instruction in IT block
45  unsigned getITCC() {
46  unsigned CC = ARMCC::AL;
47  if (instrInITBlock())
48  CC = ITStates.back();
49  return CC;
50  }
51 
52  // Advances the IT block state to the next T or E
53  void advanceITState() {
54  ITStates.pop_back();
55  }
56 
57  // Returns true if the current instruction is in an IT block
58  bool instrInITBlock() {
59  return !ITStates.empty();
60  }
61 
62  // Returns true if current instruction is the last instruction in an IT block
63  bool instrLastInITBlock() {
64  return ITStates.size() == 1;
65  }
66 
67  // Called when decoding an IT instruction. Sets the IT state for
68  // the following instructions that for the IT block. Firstcond
69  // corresponds to the field in the IT instruction encoding; Mask
70  // is in the MCOperand format in which 1 means 'else' and 0 'then'.
71  void setITState(char Firstcond, char Mask) {
72  // (3 - the number of trailing zeros) is the number of then / else.
73  unsigned NumTZ = countTrailingZeros<uint8_t>(Mask);
74  unsigned char CCBits = static_cast<unsigned char>(Firstcond & 0xf);
75  assert(NumTZ <= 3 && "Invalid IT mask!");
76  // push condition codes onto the stack the correct order for the pops
77  for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) {
78  unsigned Else = (Mask >> Pos) & 1;
79  ITStates.push_back(CCBits ^ Else);
80  }
81  ITStates.push_back(CCBits);
82  }
83 
84  private:
85  std::vector<unsigned char> ITStates;
86  };
87 
88  class VPTStatus
89  {
90  public:
91  unsigned getVPTPred() {
92  unsigned Pred = ARMVCC::None;
93  if (instrInVPTBlock())
94  Pred = VPTStates.back();
95  return Pred;
96  }
97 
98  void advanceVPTState() {
99  VPTStates.pop_back();
100  }
101 
102  bool instrInVPTBlock() {
103  return !VPTStates.empty();
104  }
105 
106  bool instrLastInVPTBlock() {
107  return VPTStates.size() == 1;
108  }
109 
110  void setVPTState(char Mask) {
111  // (3 - the number of trailing zeros) is the number of then / else.
112  unsigned NumTZ = countTrailingZeros<uint8_t>(Mask);
113  assert(NumTZ <= 3 && "Invalid VPT mask!");
114  // push predicates onto the stack the correct order for the pops
115  for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) {
116  bool T = ((Mask >> Pos) & 1) == 0;
117  if (T)
118  VPTStates.push_back(ARMVCC::Then);
119  else
120  VPTStates.push_back(ARMVCC::Else);
121  }
122  VPTStates.push_back(ARMVCC::Then);
123  }
124 
125  private:
126  SmallVector<unsigned char, 4> VPTStates;
127  };
128 
129 /// ARM disassembler for all ARM platforms.
130 class ARMDisassembler : public MCDisassembler {
131 public:
132  ARMDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx) :
133  MCDisassembler(STI, Ctx) {
134  }
135 
136  ~ARMDisassembler() override = default;
137 
138  DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
139  ArrayRef<uint8_t> Bytes, uint64_t Address,
140  raw_ostream &CStream) const override;
141 
142 private:
143  DecodeStatus getARMInstruction(MCInst &Instr, uint64_t &Size,
144  ArrayRef<uint8_t> Bytes, uint64_t Address,
145  raw_ostream &CStream) const;
146 
147  DecodeStatus getThumbInstruction(MCInst &Instr, uint64_t &Size,
148  ArrayRef<uint8_t> Bytes, uint64_t Address,
149  raw_ostream &CStream) const;
150 
151  mutable ITStatus ITBlock;
152  mutable VPTStatus VPTBlock;
153 
154  DecodeStatus AddThumbPredicate(MCInst&) const;
155  void UpdateThumbVFPPredicate(DecodeStatus &, MCInst&) const;
156 };
157 
158 } // end anonymous namespace
159 
160 static bool Check(DecodeStatus &Out, DecodeStatus In) {
161  switch (In) {
162  case MCDisassembler::Success:
163  // Out stays the same.
164  return true;
165  case MCDisassembler::SoftFail:
166  Out = In;
167  return true;
168  case MCDisassembler::Fail:
169  Out = In;
170  return false;
171  }
172  llvm_unreachable("Invalid DecodeStatus!");
173 }
174 
175 // Forward declare these because the autogenerated code will reference them.
176 // Definitions are further down.
177 static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
178  uint64_t Address, const void *Decoder);
179 static DecodeStatus DecodeCLRMGPRRegisterClass(MCInst &Inst, unsigned RegNo,
180  uint64_t Address, const void *Decoder);
181 static DecodeStatus DecodetGPROddRegisterClass(MCInst &Inst, unsigned RegNo,
182  uint64_t Address, const void *Decoder);
183 static DecodeStatus DecodetGPREvenRegisterClass(MCInst &Inst, unsigned RegNo,
184  uint64_t Address, const void *Decoder);
185 static DecodeStatus
186 DecodeGPRwithAPSR_NZCVnospRegisterClass(MCInst &Inst, unsigned RegNo,
187  uint64_t Address, const void *Decoder);
188 static DecodeStatus DecodeGPRnopcRegisterClass(MCInst &Inst,
189  unsigned RegNo, uint64_t Address,
190  const void *Decoder);
191 static DecodeStatus DecodeGPRwithAPSRRegisterClass(MCInst &Inst,
192  unsigned RegNo, uint64_t Address,
193  const void *Decoder);
194 static DecodeStatus DecodeGPRwithZRRegisterClass(MCInst &Inst,
195  unsigned RegNo, uint64_t Address,
196  const void *Decoder);
197 static DecodeStatus DecodeGPRwithZRnospRegisterClass(
198  MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder);
199 static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
200  uint64_t Address, const void *Decoder);
201 static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
202  uint64_t Address, const void *Decoder);
203 static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
204  uint64_t Address, const void *Decoder);
205 static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
206  uint64_t Address, const void *Decoder);
207 static DecodeStatus DecodeGPRPairnospRegisterClass(MCInst &Inst, unsigned RegNo,
208  uint64_t Address, const void *Decoder);
209 static DecodeStatus DecodeGPRspRegisterClass(MCInst &Inst, unsigned RegNo,
210  uint64_t Address,
211  const void *Decoder);
212 static DecodeStatus DecodeHPRRegisterClass(MCInst &Inst, unsigned RegNo,
213  uint64_t Address, const void *Decoder);
214 static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
215  uint64_t Address, const void *Decoder);
216 static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
217  uint64_t Address, const void *Decoder);
218 static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
219  uint64_t Address, const void *Decoder);
220 static DecodeStatus DecodeSPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
221  uint64_t Address, const void *Decoder);
222 static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst &Inst,
223  unsigned RegNo,
224  uint64_t Address,
225  const void *Decoder);
226 static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
227  uint64_t Address, const void *Decoder);
228 static DecodeStatus DecodeMQPRRegisterClass(MCInst &Inst, unsigned RegNo,
229  uint64_t Address, const void *Decoder);
230 static DecodeStatus DecodeQQPRRegisterClass(MCInst &Inst, unsigned RegNo,
231  uint64_t Address, const void *Decoder);
232 static DecodeStatus DecodeQQQQPRRegisterClass(MCInst &Inst, unsigned RegNo,
233  uint64_t Address, const void *Decoder);
234 static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
235  uint64_t Address, const void *Decoder);
236 static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst &Inst,
237  unsigned RegNo, uint64_t Address,
238  const void *Decoder);
239 
240 static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
241  uint64_t Address, const void *Decoder);
242 static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
243  uint64_t Address, const void *Decoder);
244 static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
245  uint64_t Address, const void *Decoder);
246 static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
247  uint64_t Address, const void *Decoder);
248 static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
249  uint64_t Address, const void *Decoder);
250 
251 static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Insn,
252  uint64_t Address, const void *Decoder);
253 static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
254  uint64_t Address, const void *Decoder);
255 static DecodeStatus DecodeAddrMode2IdxInstruction(MCInst &Inst,
256  unsigned Insn,
257  uint64_t Address,
258  const void *Decoder);
259 static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Insn,
260  uint64_t Address, const void *Decoder);
261 static DecodeStatus DecodeAddrMode3Instruction(MCInst &Inst,unsigned Insn,
262  uint64_t Address, const void *Decoder);
263 static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Insn,
264  uint64_t Address, const void *Decoder);
265 static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Insn,
266  uint64_t Address, const void *Decoder);
267 
268 static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst & Inst,
269  unsigned Insn,
270  uint64_t Adddress,
271  const void *Decoder);
272 static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
273  uint64_t Address, const void *Decoder);
274 static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
275  uint64_t Address, const void *Decoder);
276 static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
277  uint64_t Address, const void *Decoder);
278 static DecodeStatus DecodeHINTInstruction(MCInst &Inst, unsigned Insn,
279  uint64_t Address, const void *Decoder);
280 static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
281  uint64_t Address, const void *Decoder);
282 static DecodeStatus DecodeTSTInstruction(MCInst &Inst, unsigned Insn,
283  uint64_t Address, const void *Decoder);
284 static DecodeStatus DecodeSETPANInstruction(MCInst &Inst, unsigned Insn,
285  uint64_t Address, const void *Decoder);
286 static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
287  uint64_t Address, const void *Decoder);
288 static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
289  uint64_t Address, const void *Decoder);
290 static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
291  uint64_t Address, const void *Decoder);
292 static DecodeStatus DecodeAddrMode5FP16Operand(MCInst &Inst, unsigned Val,
293  uint64_t Address, const void *Decoder);
294 static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
295  uint64_t Address, const void *Decoder);
296 static DecodeStatus DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
297  uint64_t Address, const void *Decoder);
298 static DecodeStatus DecodeBranchImmInstruction(MCInst &Inst,unsigned Insn,
299  uint64_t Address, const void *Decoder);
300 static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
301  uint64_t Address, const void *Decoder);
302 static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Val,
303  uint64_t Address, const void *Decoder);
304 static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Val,
305  uint64_t Address, const void *Decoder);
306 static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Val,
307  uint64_t Address, const void *Decoder);
308 static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Val,
309  uint64_t Address, const void *Decoder);
310 static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Val,
311  uint64_t Address, const void *Decoder);
312 static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Val,
313  uint64_t Address, const void *Decoder);
314 static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Val,
315  uint64_t Address, const void *Decoder);
316 static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Val,
317  uint64_t Address, const void *Decoder);
318 static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Val,
319  uint64_t Address, const void *Decoder);
320 static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Val,
321  uint64_t Address, const void *Decoder);
322 static DecodeStatus DecodeVMOVModImmInstruction(MCInst &Inst,unsigned Val,
323  uint64_t Address, const void *Decoder);
324 static DecodeStatus DecodeMVEModImmInstruction(MCInst &Inst,unsigned Val,
325  uint64_t Address, const void *Decoder);
326 static DecodeStatus DecodeMVEVADCInstruction(MCInst &Inst, unsigned Insn,
327  uint64_t Address, const void *Decoder);
328 static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Val,
329  uint64_t Address, const void *Decoder);
330 static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
331  uint64_t Address, const void *Decoder);
332 static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
333  uint64_t Address, const void *Decoder);
334 static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
335  uint64_t Address, const void *Decoder);
336 static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
337  uint64_t Address, const void *Decoder);
338 static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
339  uint64_t Address, const void *Decoder);
340 static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn,
341  uint64_t Address, const void *Decoder);
342 static DecodeStatus DecodeMveAddrModeRQ(MCInst &Inst, unsigned Insn,
343  uint64_t Address, const void *Decoder);
344 template<int shift>
345 static DecodeStatus DecodeMveAddrModeQ(MCInst &Inst, unsigned Insn,
346  uint64_t Address, const void *Decoder);
347 static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Insn,
348  uint64_t Address, const void *Decoder);
349 static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Insn,
350  uint64_t Address, const void *Decoder);
351 static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Insn,
352  uint64_t Address, const void *Decoder);
353 static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Insn,
354  uint64_t Address, const void *Decoder);
355 static DecodeStatus DecodeBankedReg(MCInst &Inst, unsigned Insn,
356  uint64_t Address, const void *Decoder);
357 static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn,
358  uint64_t Address, const void *Decoder);
359 static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn,
360  uint64_t Address, const void *Decoder);
361 static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn,
362  uint64_t Address, const void *Decoder);
363 static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn,
364  uint64_t Address, const void *Decoder);
365 static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn,
366  uint64_t Address, const void *Decoder);
367 static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn,
368  uint64_t Address, const void *Decoder);
369 static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn,
370  uint64_t Address, const void *Decoder);
371 static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn,
372  uint64_t Address, const void *Decoder);
373 static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn,
374  uint64_t Address, const void *Decoder);
375 static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn,
376  uint64_t Address, const void *Decoder);
377 static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn,
378  uint64_t Address, const void *Decoder);
379 static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn,
380  uint64_t Address, const void *Decoder);
381 static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn,
382  uint64_t Address, const void *Decoder);
383 static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn,
384  uint64_t Address, const void *Decoder);
385 static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn,
386  uint64_t Address, const void *Decoder);
387 static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn,
388  uint64_t Address, const void *Decoder);
389 static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn,
390  uint64_t Address, const void *Decoder);
391 static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn,
392  uint64_t Address, const void *Decoder);
393 static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn,
394  uint64_t Address, const void *Decoder);
395 static DecodeStatus DecodeVCVTImmOperand(MCInst &Inst, unsigned Insn,
396  uint64_t Address, const void *Decoder);
397 static DecodeStatus DecodeNEONComplexLane64Instruction(MCInst &Inst,
398  unsigned Val,
399  uint64_t Address,
400  const void *Decoder);
401 
402 static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
403  uint64_t Address, const void *Decoder);
404 static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
405  uint64_t Address, const void *Decoder);
406 static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
407  uint64_t Address, const void *Decoder);
408 static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
409  uint64_t Address, const void *Decoder);
410 static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
411  uint64_t Address, const void *Decoder);
412 static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
413  uint64_t Address, const void *Decoder);
414 static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
415  uint64_t Address, const void *Decoder);
416 static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
417  uint64_t Address, const void *Decoder);
418 static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
419  uint64_t Address, const void *Decoder);
420 static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Val,
421  uint64_t Address, const void *Decoder);
422 static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
423  uint64_t Address, const void* Decoder);
424 static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
425  uint64_t Address, const void* Decoder);
426 static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn,
427  uint64_t Address, const void* Decoder);
428 static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
429  uint64_t Address, const void* Decoder);
430 static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val,
431  uint64_t Address, const void *Decoder);
432 static DecodeStatus DecodeT2Imm7S4(MCInst &Inst, unsigned Val,
433  uint64_t Address, const void *Decoder);
434 static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
435  uint64_t Address, const void *Decoder);
436 static DecodeStatus DecodeT2AddrModeImm7s4(MCInst &Inst, unsigned Val,
437  uint64_t Address,
438  const void *Decoder);
439 static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val,
440  uint64_t Address, const void *Decoder);
441 static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val,
442  uint64_t Address, const void *Decoder);
443 template<int shift>
444 static DecodeStatus DecodeT2Imm7(MCInst &Inst, unsigned Val,
445  uint64_t Address, const void *Decoder);
446 static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
447  uint64_t Address, const void *Decoder);
448 template<int shift>
449 static DecodeStatus DecodeTAddrModeImm7(MCInst &Inst, unsigned Val,
450  uint64_t Address, const void *Decoder);
451 template<int shift, int WriteBack>
452 static DecodeStatus DecodeT2AddrModeImm7(MCInst &Inst, unsigned Val,
453  uint64_t Address, const void *Decoder);
454 static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Val,
455  uint64_t Address, const void *Decoder);
456 static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
457  uint64_t Address, const void *Decoder);
458 static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn,
459  uint64_t Address, const void *Decoder);
460 static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
461  uint64_t Address, const void *Decoder);
462 static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Insn,
463  uint64_t Address, const void *Decoder);
464 static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
465  uint64_t Address, const void *Decoder);
466 static DecodeStatus DecodeThumbTableBranch(MCInst &Inst, unsigned Val,
467  uint64_t Address, const void *Decoder);
468 static DecodeStatus DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Val,
469  uint64_t Address, const void *Decoder);
470 static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val,
471  uint64_t Address, const void *Decoder);
472 static DecodeStatus DecodeThumbBCCTargetOperand(MCInst &Inst,unsigned Val,
473  uint64_t Address, const void *Decoder);
474 static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val,
475  uint64_t Address, const void *Decoder);
476 static DecodeStatus DecodeIT(MCInst &Inst, unsigned Val,
477  uint64_t Address, const void *Decoder);
478 static DecodeStatus DecodeT2LDRDPreInstruction(MCInst &Inst,unsigned Insn,
479  uint64_t Address, const void *Decoder);
480 static DecodeStatus DecodeT2STRDPreInstruction(MCInst &Inst,unsigned Insn,
481  uint64_t Address, const void *Decoder);
482 static DecodeStatus DecodeT2Adr(MCInst &Inst, unsigned Val,
483  uint64_t Address, const void *Decoder);
484 static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Val,
485  uint64_t Address, const void *Decoder);
486 static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, unsigned Val,
487  uint64_t Address, const void *Decoder);
488 
489 static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val,
490  uint64_t Address, const void *Decoder);
491 static DecodeStatus DecoderForMRRC2AndMCRR2(MCInst &Inst, unsigned Val,
492  uint64_t Address, const void *Decoder);
493 static DecodeStatus DecodeForVMRSandVMSR(MCInst &Inst, unsigned Val,
494  uint64_t Address, const void *Decoder);
495 
496 template <bool isSigned, bool isNeg, bool zeroPermitted, int size>
497 static DecodeStatus DecodeBFLabelOperand(MCInst &Inst, unsigned val,
498  uint64_t Address, const void *Decoder);
499 static DecodeStatus DecodeBFAfterTargetOperand(MCInst &Inst, unsigned val,
500  uint64_t Address,
501  const void *Decoder);
502 static DecodeStatus DecodePredNoALOperand(MCInst &Inst, unsigned Val,
503  uint64_t Address,
504  const void *Decoder);
505 static DecodeStatus DecodeLOLoop(MCInst &Inst, unsigned Insn, uint64_t Address,
506  const void *Decoder);
507 static DecodeStatus DecodeLongShiftOperand(MCInst &Inst, unsigned Val,
508  uint64_t Address,
509  const void *Decoder);
510 static DecodeStatus DecodeVSCCLRM(MCInst &Inst, unsigned Insn, uint64_t Address,
511  const void *Decoder);
512 static DecodeStatus DecodeVPTMaskOperand(MCInst &Inst, unsigned Val,
513  uint64_t Address, const void *Decoder);
514 static DecodeStatus DecodeVpredROperand(MCInst &Inst, unsigned Val,
515  uint64_t Address, const void *Decoder);
516 static DecodeStatus DecodeRestrictedIPredicateOperand(MCInst &Inst, unsigned Val,
517  uint64_t Address,
518  const void *Decoder);
519 static DecodeStatus DecodeRestrictedSPredicateOperand(MCInst &Inst, unsigned Val,
520  uint64_t Address,
521  const void *Decoder);
522 static DecodeStatus DecodeRestrictedUPredicateOperand(MCInst &Inst, unsigned Val,
523  uint64_t Address,
524  const void *Decoder);
525 static DecodeStatus DecodeRestrictedFPPredicateOperand(MCInst &Inst,
526  unsigned Val,
527  uint64_t Address,
528  const void *Decoder);
529 template<bool Writeback>
530 static DecodeStatus DecodeVSTRVLDR_SYSREG(MCInst &Inst, unsigned Insn,
531  uint64_t Address,
532  const void *Decoder);
533 template<int shift>
534 static DecodeStatus DecodeMVE_MEM_1_pre(MCInst &Inst, unsigned Val,
535  uint64_t Address, const void *Decoder);
536 template<int shift>
537 static DecodeStatus DecodeMVE_MEM_2_pre(MCInst &Inst, unsigned Val,
538  uint64_t Address, const void *Decoder);
539 template<int shift>
540 static DecodeStatus DecodeMVE_MEM_3_pre(MCInst &Inst, unsigned Val,
541  uint64_t Address, const void *Decoder);
542 template<unsigned MinLog, unsigned MaxLog>
543 static DecodeStatus DecodePowerTwoOperand(MCInst &Inst, unsigned Val,
544  uint64_t Address,
545  const void *Decoder);
546 template<unsigned start>
547 static DecodeStatus DecodeMVEPairVectorIndexOperand(MCInst &Inst, unsigned Val,
548  uint64_t Address,
549  const void *Decoder);
550 static DecodeStatus DecodeMVEVMOVQtoDReg(MCInst &Inst, unsigned Insn,
551  uint64_t Address,
552  const void *Decoder);
553 static DecodeStatus DecodeMVEVMOVDRegtoQ(MCInst &Inst, unsigned Insn,
554  uint64_t Address,
555  const void *Decoder);
556 static DecodeStatus DecodeMVEVCVTt1fp(MCInst &Inst, unsigned Insn,
557  uint64_t Address, const void *Decoder);
558 typedef DecodeStatus OperandDecoder(MCInst &Inst, unsigned Val,
559  uint64_t Address, const void *Decoder);
560 template<bool scalar, OperandDecoder predicate_decoder>
561 static DecodeStatus DecodeMVEVCMP(MCInst &Inst, unsigned Insn,
562  uint64_t Address, const void *Decoder);
563 static DecodeStatus DecodeMveVCTP(MCInst &Inst, unsigned Insn,
564  uint64_t Address, const void *Decoder);
565 static DecodeStatus DecodeMVEVPNOT(MCInst &Inst, unsigned Insn,
566  uint64_t Address, const void *Decoder);
567 static DecodeStatus DecodeMVEOverlappingLongShift(MCInst &Inst, unsigned Insn,
568  uint64_t Address,
569  const void *Decoder);
570 static DecodeStatus DecodeT2AddSubSPImm(MCInst &Inst, unsigned Insn,
571  uint64_t Address, const void *Decoder);
572 
573 #include "ARMGenDisassemblerTables.inc"
574 
575 static MCDisassembler *createARMDisassembler(const Target &T,
576  const MCSubtargetInfo &STI,
577  MCContext &Ctx) {
578  return new ARMDisassembler(STI, Ctx);
579 }
580 
581 // Post-decoding checks
582 static DecodeStatus checkDecodedInstruction(MCInst &MI, uint64_t &Size,
583  uint64_t Address, raw_ostream &CS,
584  uint32_t Insn,
585  DecodeStatus Result) {
586  switch (MI.getOpcode()) {
587  case ARM::HVC: {
588  // HVC is undefined if condition = 0xf otherwise upredictable
589  // if condition != 0xe
590  uint32_t Cond = (Insn >> 28) & 0xF;
591  if (Cond == 0xF)
592  return MCDisassembler::Fail;
593  if (Cond != 0xE)
594  return MCDisassembler::SoftFail;
595  return Result;
596  }
597  case ARM::t2ADDri:
598  case ARM::t2ADDri12:
599  case ARM::t2ADDrr:
600  case ARM::t2ADDrs:
601  case ARM::t2SUBri:
602  case ARM::t2SUBri12:
603  case ARM::t2SUBrr:
604  case ARM::t2SUBrs:
605  if (MI.getOperand(0).getReg() == ARM::SP &&
606  MI.getOperand(1).getReg() != ARM::SP)
607  return MCDisassembler::SoftFail;
608  return Result;
609  default: return Result;
610  }
611 }
612 
613 DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
614  ArrayRef<uint8_t> Bytes,
615  uint64_t Address,
616  raw_ostream &CS) const {
617  if (STI.getFeatureBits()[ARM::ModeThumb])
618  return getThumbInstruction(MI, Size, Bytes, Address, CS);
619  return getARMInstruction(MI, Size, Bytes, Address, CS);
620 }
621 
622 DecodeStatus ARMDisassembler::getARMInstruction(MCInst &MI, uint64_t &Size,
623  ArrayRef<uint8_t> Bytes,
624  uint64_t Address,
625  raw_ostream &CS) const {
626  CommentStream = &CS;
627 
628  assert(!STI.getFeatureBits()[ARM::ModeThumb] &&
629  "Asked to disassemble an ARM instruction but Subtarget is in Thumb "
630  "mode!");
631 
632  // We want to read exactly 4 bytes of data.
633  if (Bytes.size() < 4) {
634  Size = 0;
635  return MCDisassembler::Fail;
636  }
637 
638  // Encoded as a small-endian 32-bit word in the stream.
639  uint32_t Insn =
640  (Bytes[3] << 24) | (Bytes[2] << 16) | (Bytes[1] << 8) | (Bytes[0] << 0);
641 
642  // Calling the auto-generated decoder function.
643  DecodeStatus Result =
644  decodeInstruction(DecoderTableARM32, MI, Insn, Address, this, STI);
645  if (Result != MCDisassembler::Fail) {
646  Size = 4;
647  return checkDecodedInstruction(MI, Size, Address, CS, Insn, Result);
648  }
649 
650  struct DecodeTable {
651  const uint8_t *P;
652  bool DecodePred;
653  };
654 
655  const DecodeTable Tables[] = {
656  {DecoderTableVFP32, false}, {DecoderTableVFPV832, false},
657  {DecoderTableNEONData32, true}, {DecoderTableNEONLoadStore32, true},
658  {DecoderTableNEONDup32, true}, {DecoderTablev8NEON32, false},
659  {DecoderTablev8Crypto32, false},
660  };
661 
662  for (auto Table : Tables) {
663  Result = decodeInstruction(Table.P, MI, Insn, Address, this, STI);
664  if (Result != MCDisassembler::Fail) {
665  Size = 4;
666  // Add a fake predicate operand, because we share these instruction
667  // definitions with Thumb2 where these instructions are predicable.
668  if (Table.DecodePred && !DecodePredicateOperand(MI, 0xE, Address, this))
669  return MCDisassembler::Fail;
670  return Result;
671  }
672  }
673 
674  Result =
675  decodeInstruction(DecoderTableCoProc32, MI, Insn, Address, this, STI);
676  if (Result != MCDisassembler::Fail) {
677  Size = 4;
678  return checkDecodedInstruction(MI, Size, Address, CS, Insn, Result);
679  }
680 
681  Size = 4;
682  return MCDisassembler::Fail;
683 }
684 
685 namespace llvm {
686 
687 extern const MCInstrDesc ARMInsts[];
688 
689 } // end namespace llvm
690 
691 /// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the
692 /// immediate Value in the MCInst. The immediate Value has had any PC
693 /// adjustment made by the caller. If the instruction is a branch instruction
694 /// then isBranch is true, else false. If the getOpInfo() function was set as
695 /// part of the setupForSymbolicDisassembly() call then that function is called
696 /// to get any symbolic information at the Address for this instruction. If
697 /// that returns non-zero then the symbolic information it returns is used to
698 /// create an MCExpr and that is added as an operand to the MCInst. If
699 /// getOpInfo() returns zero and isBranch is true then a symbol look up for
700 /// Value is done and if a symbol is found an MCExpr is created with that, else
701 /// an MCExpr with Value is created. This function returns true if it adds an
702 /// operand to the MCInst and false otherwise.
703 static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value,
704  bool isBranch, uint64_t InstSize,
705  MCInst &MI, const void *Decoder) {
706  const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
707  // FIXME: Does it make sense for value to be negative?
708  return Dis->tryAddingSymbolicOperand(MI, (uint32_t)Value, Address, isBranch,
709  /* Offset */ 0, InstSize);
710 }
711 
712 /// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being
713 /// referenced by a load instruction with the base register that is the Pc.
714 /// These can often be values in a literal pool near the Address of the
715 /// instruction. The Address of the instruction and its immediate Value are
716 /// used as a possible literal pool entry. The SymbolLookUp call back will
717 /// return the name of a symbol referenced by the literal pool's entry if
718 /// the referenced address is that of a symbol. Or it will return a pointer to
719 /// a literal 'C' string if the referenced address of the literal pool's entry
720 /// is an address into a section with 'C' string literals.
721 static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value,
722  const void *Decoder) {
723  const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
724  Dis->tryAddingPcLoadReferenceComment(Value, Address);
725 }
726 
727 // Thumb1 instructions don't have explicit S bits. Rather, they
728 // implicitly set CPSR. Since it's not represented in the encoding, the
729 // auto-generated decoder won't inject the CPSR operand. We need to fix
730 // that as a post-pass.
731 static void AddThumb1SBit(MCInst &MI, bool InITBlock) {
732  const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
733  unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
734  MCInst::iterator I = MI.begin();
735  for (unsigned i = 0; i < NumOps; ++i, ++I) {
736  if (I == MI.end()) break;
737  if (OpInfo[i].isOptionalDef() && OpInfo[i].RegClass == ARM::CCRRegClassID) {
738  if (i > 0 && OpInfo[i-1].isPredicate()) continue;
739  MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR));
740  return;
741  }
742  }
743 
744  MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR));
745 }
746 
747 static bool isVectorPredicable(unsigned Opcode) {
748  const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
749  unsigned short NumOps = ARMInsts[Opcode].NumOperands;
750  for (unsigned i = 0; i < NumOps; ++i) {
751  if (ARM::isVpred(OpInfo[i].OperandType))
752  return true;
753  }
754  return false;
755 }
756 
757 // Most Thumb instructions don't have explicit predicates in the
758 // encoding, but rather get their predicates from IT context. We need
759 // to fix up the predicate operands using this context information as a
760 // post-pass.
761 MCDisassembler::DecodeStatus
762 ARMDisassembler::AddThumbPredicate(MCInst &MI) const {
763  MCDisassembler::DecodeStatus S = Success;
764 
765  const FeatureBitset &FeatureBits = getSubtargetInfo().getFeatureBits();
766 
767  // A few instructions actually have predicates encoded in them. Don't
768  // try to overwrite it if we're seeing one of those.
769  switch (MI.getOpcode()) {
770  case ARM::tBcc:
771  case ARM::t2Bcc:
772  case ARM::tCBZ:
773  case ARM::tCBNZ:
774  case ARM::tCPS:
775  case ARM::t2CPS3p:
776  case ARM::t2CPS2p:
777  case ARM::t2CPS1p:
778  case ARM::t2CSEL:
779  case ARM::t2CSINC:
780  case ARM::t2CSINV:
781  case ARM::t2CSNEG:
782  case ARM::tMOVSr:
783  case ARM::tSETEND:
784  // Some instructions (mostly conditional branches) are not
785  // allowed in IT blocks.
786  if (ITBlock.instrInITBlock())
787  S = SoftFail;
788  else
789  return Success;
790  break;
791  case ARM::t2HINT:
792  if (MI.getOperand(0).getImm() == 0x10 && (FeatureBits[ARM::FeatureRAS]) != 0)
793  S = SoftFail;
794  break;
795  case ARM::tB:
796  case ARM::t2B:
797  case ARM::t2TBB:
798  case ARM::t2TBH:
799  // Some instructions (mostly unconditional branches) can
800  // only appears at the end of, or outside of, an IT.
801  if (ITBlock.instrInITBlock() && !ITBlock.instrLastInITBlock())
802  S = SoftFail;
803  break;
804  default:
805  break;
806  }
807 
808  // Warn on non-VPT predicable instruction in a VPT block and a VPT
809  // predicable instruction in an IT block
810  if ((!isVectorPredicable(MI.getOpcode()) && VPTBlock.instrInVPTBlock()) ||
811  (isVectorPredicable(MI.getOpcode()) && ITBlock.instrInITBlock()))
812  S = SoftFail;
813 
814  // If we're in an IT/VPT block, base the predicate on that. Otherwise,
815  // assume a predicate of AL.
816  unsigned CC = ARMCC::AL;
817  unsigned VCC = ARMVCC::None;
818  if (ITBlock.instrInITBlock()) {
819  CC = ITBlock.getITCC();
820  ITBlock.advanceITState();
821  } else if (VPTBlock.instrInVPTBlock()) {
822  VCC = VPTBlock.getVPTPred();
823  VPTBlock.advanceVPTState();
824  }
825 
826  const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
827  unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
828 
829  MCInst::iterator CCI = MI.begin();
830  for (unsigned i = 0; i < NumOps; ++i, ++CCI) {
831  if (OpInfo[i].isPredicate() || CCI == MI.end()) break;
832  }
833 
834  if (ARMInsts[MI.getOpcode()].isPredicable()) {
835  CCI = MI.insert(CCI, MCOperand::createImm(CC));
836  ++CCI;
837  if (CC == ARMCC::AL)
838  MI.insert(CCI, MCOperand::createReg(0));
839  else
840  MI.insert(CCI, MCOperand::createReg(ARM::CPSR));
841  } else if (CC != ARMCC::AL) {
842  Check(S, SoftFail);
843  }
844 
845  MCInst::iterator VCCI = MI.begin();
846  unsigned VCCPos;
847  for (VCCPos = 0; VCCPos < NumOps; ++VCCPos, ++VCCI) {
848  if (ARM::isVpred(OpInfo[VCCPos].OperandType) || VCCI == MI.end()) break;
849  }
850 
851  if (isVectorPredicable(MI.getOpcode())) {
852  VCCI = MI.insert(VCCI, MCOperand::createImm(VCC));
853  ++VCCI;
854  if (VCC == ARMVCC::None)
855  MI.insert(VCCI, MCOperand::createReg(0));
856  else
857  MI.insert(VCCI, MCOperand::createReg(ARM::P0));
858  if (OpInfo[VCCPos].OperandType == ARM::OPERAND_VPRED_R) {
859  int TiedOp = ARMInsts[MI.getOpcode()].getOperandConstraint(
860  VCCPos + 2, MCOI::TIED_TO);
861  assert(TiedOp >= 0 &&
862  "Inactive register in vpred_r is not tied to an output!");
863  // Copy the operand to ensure it's not invalidated when MI grows.
864  MI.insert(VCCI, MCOperand(MI.getOperand(TiedOp)));
865  }
866  } else if (VCC != ARMVCC::None) {
867  Check(S, SoftFail);
868  }
869 
870  return S;
871 }
872 
873 // Thumb VFP instructions are a special case. Because we share their
874 // encodings between ARM and Thumb modes, and they are predicable in ARM
875 // mode, the auto-generated decoder will give them an (incorrect)
876 // predicate operand. We need to rewrite these operands based on the IT
877 // context as a post-pass.
878 void ARMDisassembler::UpdateThumbVFPPredicate(
879  DecodeStatus &S, MCInst &MI) const {
880  unsigned CC;
881  CC = ITBlock.getITCC();
882  if (CC == 0xF)
883  CC = ARMCC::AL;
884  if (ITBlock.instrInITBlock())
885  ITBlock.advanceITState();
886  else if (VPTBlock.instrInVPTBlock()) {
887  CC = VPTBlock.getVPTPred();
888  VPTBlock.advanceVPTState();
889  }
890 
891  const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
892  MCInst::iterator I = MI.begin();
893  unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
894  for (unsigned i = 0; i < NumOps; ++i, ++I) {
895  if (OpInfo[i].isPredicate() ) {
896  if (CC != ARMCC::AL && !ARMInsts[MI.getOpcode()].isPredicable())
897  Check(S, SoftFail);
898  I->setImm(CC);
899  ++I;
900  if (CC == ARMCC::AL)
901  I->setReg(0);
902  else
903  I->setReg(ARM::CPSR);
904  return;
905  }
906  }
907 }
908 
909 DecodeStatus ARMDisassembler::getThumbInstruction(MCInst &MI, uint64_t &Size,
910  ArrayRef<uint8_t> Bytes,
911  uint64_t Address,
912  raw_ostream &CS) const {
913  CommentStream = &CS;
914 
915  assert(STI.getFeatureBits()[ARM::ModeThumb] &&
916  "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!");
917 
918  // We want to read exactly 2 bytes of data.
919  if (Bytes.size() < 2) {
920  Size = 0;
921  return MCDisassembler::Fail;
922  }
923 
924  uint16_t Insn16 = (Bytes[1] << 8) | Bytes[0];
925  DecodeStatus Result =
926  decodeInstruction(DecoderTableThumb16, MI, Insn16, Address, this, STI);
927  if (Result != MCDisassembler::Fail) {
928  Size = 2;
929  Check(Result, AddThumbPredicate(MI));
930  return Result;
931  }
932 
933  Result = decodeInstruction(DecoderTableThumbSBit16, MI, Insn16, Address, this,
934  STI);
935  if (Result) {
936  Size = 2;
937  bool InITBlock = ITBlock.instrInITBlock();
938  Check(Result, AddThumbPredicate(MI));
939  AddThumb1SBit(MI, InITBlock);
940  return Result;
941  }
942 
943  Result =
944  decodeInstruction(DecoderTableThumb216, MI, Insn16, Address, this, STI);
945  if (Result != MCDisassembler::Fail) {
946  Size = 2;
947 
948  // Nested IT blocks are UNPREDICTABLE. Must be checked before we add
949  // the Thumb predicate.
950  if (MI.getOpcode() == ARM::t2IT && ITBlock.instrInITBlock())
951  Result = MCDisassembler::SoftFail;
952 
953  Check(Result, AddThumbPredicate(MI));
954 
955  // If we find an IT instruction, we need to parse its condition
956  // code and mask operands so that we can apply them correctly
957  // to the subsequent instructions.
958  if (MI.getOpcode() == ARM::t2IT) {
959  unsigned Firstcond = MI.getOperand(0).getImm();
960  unsigned Mask = MI.getOperand(1).getImm();
961  ITBlock.setITState(Firstcond, Mask);
962 
963  // An IT instruction that would give a 'NV' predicate is unpredictable.
964  if (Firstcond == ARMCC::AL && !isPowerOf2_32(Mask))
965  CS << "unpredictable IT predicate sequence";
966  }
967 
968  return Result;
969  }
970 
971  // We want to read exactly 4 bytes of data.
972  if (Bytes.size() < 4) {
973  Size = 0;
974  return MCDisassembler::Fail;
975  }
976 
977  uint32_t Insn32 =
978  (Bytes[3] << 8) | (Bytes[2] << 0) | (Bytes[1] << 24) | (Bytes[0] << 16);
979 
980  Result =
981  decodeInstruction(DecoderTableMVE32, MI, Insn32, Address, this, STI);
982  if (Result != MCDisassembler::Fail) {
983  Size = 4;
984 
985  // Nested VPT blocks are UNPREDICTABLE. Must be checked before we add
986  // the VPT predicate.
987  if (isVPTOpcode(MI.getOpcode()) && VPTBlock.instrInVPTBlock())
988  Result = MCDisassembler::SoftFail;
989 
990  Check(Result, AddThumbPredicate(MI));
991 
992  if (isVPTOpcode(MI.getOpcode())) {
993  unsigned Mask = MI.getOperand(0).getImm();
994  VPTBlock.setVPTState(Mask);
995  }
996 
997  return Result;
998  }
999 
1000  Result =
1001  decodeInstruction(DecoderTableThumb32, MI, Insn32, Address, this, STI);
1002  if (Result != MCDisassembler::Fail) {
1003  Size = 4;
1004  bool InITBlock = ITBlock.instrInITBlock();
1005  Check(Result, AddThumbPredicate(MI));
1006  AddThumb1SBit(MI, InITBlock);
1007  return Result;
1008  }
1009 
1010  Result =
1011  decodeInstruction(DecoderTableThumb232, MI, Insn32, Address, this, STI);
1012  if (Result != MCDisassembler::Fail) {
1013  Size = 4;
1014  Check(Result, AddThumbPredicate(MI));
1015  return checkDecodedInstruction(MI, Size, Address, CS, Insn32, Result);
1016  }
1017 
1018  if (fieldFromInstruction(Insn32, 28, 4) == 0xE) {
1019  Result =
1020  decodeInstruction(DecoderTableVFP32, MI, Insn32, Address, this, STI);
1021  if (Result != MCDisassembler::Fail) {
1022  Size = 4;
1023  UpdateThumbVFPPredicate(Result, MI);
1024  return Result;
1025  }
1026  }
1027 
1028  Result =
1029  decodeInstruction(DecoderTableVFPV832, MI, Insn32, Address, this, STI);
1030  if (Result != MCDisassembler::Fail) {
1031  Size = 4;
1032  return Result;
1033  }
1034 
1035  if (fieldFromInstruction(Insn32, 28, 4) == 0xE) {
1036  Result = decodeInstruction(DecoderTableNEONDup32, MI, Insn32, Address, this,
1037  STI);
1038  if (Result != MCDisassembler::Fail) {
1039  Size = 4;
1040  Check(Result, AddThumbPredicate(MI));
1041  return Result;
1042  }
1043  }
1044 
1045  if (fieldFromInstruction(Insn32, 24, 8) == 0xF9) {
1046  uint32_t NEONLdStInsn = Insn32;
1047  NEONLdStInsn &= 0xF0FFFFFF;
1048  NEONLdStInsn |= 0x04000000;
1049  Result = decodeInstruction(DecoderTableNEONLoadStore32, MI, NEONLdStInsn,
1050  Address, this, STI);
1051  if (Result != MCDisassembler::Fail) {
1052  Size = 4;
1053  Check(Result, AddThumbPredicate(MI));
1054  return Result;
1055  }
1056  }
1057 
1058  if (fieldFromInstruction(Insn32, 24, 4) == 0xF) {
1059  uint32_t NEONDataInsn = Insn32;
1060  NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24
1061  NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
1062  NEONDataInsn |= 0x12000000; // Set bits 28 and 25
1063  Result = decodeInstruction(DecoderTableNEONData32, MI, NEONDataInsn,
1064  Address, this, STI);
1065  if (Result != MCDisassembler::Fail) {
1066  Size = 4;
1067  Check(Result, AddThumbPredicate(MI));
1068  return Result;
1069  }
1070 
1071  uint32_t NEONCryptoInsn = Insn32;
1072  NEONCryptoInsn &= 0xF0FFFFFF; // Clear bits 27-24
1073  NEONCryptoInsn |= (NEONCryptoInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
1074  NEONCryptoInsn |= 0x12000000; // Set bits 28 and 25
1075  Result = decodeInstruction(DecoderTablev8Crypto32, MI, NEONCryptoInsn,
1076  Address, this, STI);
1077  if (Result != MCDisassembler::Fail) {
1078  Size = 4;
1079  return Result;
1080  }
1081 
1082  uint32_t NEONv8Insn = Insn32;
1083  NEONv8Insn &= 0xF3FFFFFF; // Clear bits 27-26
1084  Result = decodeInstruction(DecoderTablev8NEON32, MI, NEONv8Insn, Address,
1085  this, STI);
1086  if (Result != MCDisassembler::Fail) {
1087  Size = 4;
1088  return Result;
1089  }
1090  }
1091 
1092  uint32_t Coproc = fieldFromInstruction(Insn32, 8, 4);
1093  const uint8_t *DecoderTable = ARM::isCDECoproc(Coproc, STI)
1094  ? DecoderTableThumb2CDE32
1095  : DecoderTableThumb2CoProc32;
1096  Result =
1097  decodeInstruction(DecoderTable, MI, Insn32, Address, this, STI);
1098  if (Result != MCDisassembler::Fail) {
1099  Size = 4;
1100  Check(Result, AddThumbPredicate(MI));
1101  return Result;
1102  }
1103 
1104  Size = 0;
1105  return MCDisassembler::Fail;
1106 }
1107 
1108 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMDisassembler() {
1109  TargetRegistry::RegisterMCDisassembler(getTheARMLETarget(),
1110  createARMDisassembler);
1111  TargetRegistry::RegisterMCDisassembler(getTheARMBETarget(),
1112  createARMDisassembler);
1113  TargetRegistry::RegisterMCDisassembler(getTheThumbLETarget(),
1114  createARMDisassembler);
1115  TargetRegistry::RegisterMCDisassembler(getTheThumbBETarget(),
1116  createARMDisassembler);
1117 }
1118 
1119 static const uint16_t GPRDecoderTable[] = {
1120  ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1121  ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1122  ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1123  ARM::R12, ARM::SP, ARM::LR, ARM::PC
1124 };
1125 
1126 static const uint16_t CLRMGPRDecoderTable[] = {
1127  ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1128  ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1129  ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1130  ARM::R12, 0, ARM::LR, ARM::APSR
1131 };
1132 
1133 static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1134  uint64_t Address, const void *Decoder) {
1135  if (RegNo > 15)
1136  return MCDisassembler::Fail;
1137 
1138  unsigned Register = GPRDecoderTable[RegNo];
1139  Inst.addOperand(MCOperand::createReg(Register));
1140  return MCDisassembler::Success;
1141 }
1142 
1143 static DecodeStatus DecodeCLRMGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1144  uint64_t Address,
1145  const void *Decoder) {
1146  if (RegNo > 15)
1147  return MCDisassembler::Fail;
1148 
1149  unsigned Register = CLRMGPRDecoderTable[RegNo];
1150  if (Register == 0)
1151  return MCDisassembler::Fail;
1152 
1153  Inst.addOperand(MCOperand::createReg(Register));
1154  return MCDisassembler::Success;
1155 }
1156 
1157 static DecodeStatus
1158 DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo,
1159  uint64_t Address, const void *Decoder) {
1160  DecodeStatus S = MCDisassembler::Success;
1161 
1162  if (RegNo == 15)
1163  S = MCDisassembler::SoftFail;
1164 
1165  Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1166 
1167  return S;
1168 }
1169 
1170 static DecodeStatus
1171 DecodeGPRwithAPSRRegisterClass(MCInst &Inst, unsigned RegNo,
1172  uint64_t Address, const void *Decoder) {
1173  DecodeStatus S = MCDisassembler::Success;
1174 
1175  if (RegNo == 15)
1176  {
1177  Inst.addOperand(MCOperand::createReg(ARM::APSR_NZCV));
1178  return MCDisassembler::Success;
1179  }
1180 
1181  Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1182  return S;
1183 }
1184 
1185 static DecodeStatus
1186 DecodeGPRwithZRRegisterClass(MCInst &Inst, unsigned RegNo,
1187  uint64_t Address, const void *Decoder) {
1188  DecodeStatus S = MCDisassembler::Success;
1189 
1190  if (RegNo == 15)
1191  {
1192  Inst.addOperand(MCOperand::createReg(ARM::ZR));
1193  return MCDisassembler::Success;
1194  }
1195 
1196  if (RegNo == 13)
1197  Check(S, MCDisassembler::SoftFail);
1198 
1199  Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1200  return S;
1201 }
1202 
1203 static DecodeStatus
1204 DecodeGPRwithZRnospRegisterClass(MCInst &Inst, unsigned RegNo,
1205  uint64_t Address, const void *Decoder) {
1206  DecodeStatus S = MCDisassembler::Success;
1207  if (RegNo == 13)
1208  return MCDisassembler::Fail;
1209  Check(S, DecodeGPRwithZRRegisterClass(Inst, RegNo, Address, Decoder));
1210  return S;
1211 }
1212 
1213 static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1214  uint64_t Address, const void *Decoder) {
1215  if (RegNo > 7)
1216  return MCDisassembler::Fail;
1217  return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder);
1218 }
1219 
1220 static const uint16_t GPRPairDecoderTable[] = {
1221  ARM::R0_R1, ARM::R2_R3, ARM::R4_R5, ARM::R6_R7,
1222  ARM::R8_R9, ARM::R10_R11, ARM::R12_SP
1223 };
1224 
1225 static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
1226  uint64_t Address, const void *Decoder) {
1227  DecodeStatus S = MCDisassembler::Success;
1228 
1229  // According to the Arm ARM RegNo = 14 is undefined, but we return fail
1230  // rather than SoftFail as there is no GPRPair table entry for index 7.
1231  if (RegNo > 13)
1232  return MCDisassembler::Fail;
1233 
1234  if (RegNo & 1)
1235  S = MCDisassembler::SoftFail;
1236 
1237  unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
1238  Inst.addOperand(MCOperand::createReg(RegisterPair));
1239  return S;
1240 }
1241 
1242 static DecodeStatus DecodeGPRPairnospRegisterClass(MCInst &Inst, unsigned RegNo,
1243  uint64_t Address, const void *Decoder) {
1244  if (RegNo > 13)
1245  return MCDisassembler::Fail;
1246 
1247  unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
1248  Inst.addOperand(MCOperand::createReg(RegisterPair));
1249 
1250  if ((RegNo & 1) || RegNo > 10)
1251  return MCDisassembler::SoftFail;
1252  return MCDisassembler::Success;
1253 }
1254 
1255 static DecodeStatus DecodeGPRspRegisterClass(MCInst &Inst, unsigned RegNo,
1256  uint64_t Address,
1257  const void *Decoder) {
1258  if (RegNo != 13)
1259  return MCDisassembler::Fail;
1260 
1261  unsigned Register = GPRDecoderTable[RegNo];
1262  Inst.addOperand(MCOperand::createReg(Register));
1263  return MCDisassembler::Success;
1264 }
1265 
1266 static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1267  uint64_t Address, const void *Decoder) {
1268  unsigned Register = 0;
1269  switch (RegNo) {
1270  case 0:
1271  Register = ARM::R0;
1272  break;
1273  case 1:
1274  Register = ARM::R1;
1275  break;
1276  case 2:
1277  Register = ARM::R2;
1278  break;
1279  case 3:
1280  Register = ARM::R3;
1281  break;
1282  case 9:
1283  Register = ARM::R9;
1284  break;
1285  case 12:
1286  Register = ARM::R12;
1287  break;
1288  default:
1289  return MCDisassembler::Fail;
1290  }
1291 
1292  Inst.addOperand(MCOperand::createReg(Register));
1293  return MCDisassembler::Success;
1294 }
1295 
1296 static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1297  uint64_t Address, const void *Decoder) {
1298  DecodeStatus S = MCDisassembler::Success;
1299 
1300  const FeatureBitset &featureBits =
1301  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1302 
1303  if ((RegNo == 13 && !featureBits[ARM::HasV8Ops]) || RegNo == 15)
1304  S = MCDisassembler::SoftFail;
1305 
1306  Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1307  return S;
1308 }
1309 
1310 static const uint16_t SPRDecoderTable[] = {
1311  ARM::S0, ARM::S1, ARM::S2, ARM::S3,
1312  ARM::S4, ARM::S5, ARM::S6, ARM::S7,
1313  ARM::S8, ARM::S9, ARM::S10, ARM::S11,
1314  ARM::S12, ARM::S13, ARM::S14, ARM::S15,
1315  ARM::S16, ARM::S17, ARM::S18, ARM::S19,
1316  ARM::S20, ARM::S21, ARM::S22, ARM::S23,
1317  ARM::S24, ARM::S25, ARM::S26, ARM::S27,
1318  ARM::S28, ARM::S29, ARM::S30, ARM::S31
1319 };
1320 
1321 static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
1322  uint64_t Address, const void *Decoder) {
1323  if (RegNo > 31)
1324  return MCDisassembler::Fail;
1325 
1326  unsigned Register = SPRDecoderTable[RegNo];
1327  Inst.addOperand(MCOperand::createReg(Register));
1328  return MCDisassembler::Success;
1329 }
1330 
1331 static DecodeStatus DecodeHPRRegisterClass(MCInst &Inst, unsigned RegNo,
1332  uint64_t Address, const void *Decoder) {
1333  return DecodeSPRRegisterClass(Inst, RegNo, Address, Decoder);
1334 }
1335 
1336 static const uint16_t DPRDecoderTable[] = {
1337  ARM::D0, ARM::D1, ARM::D2, ARM::D3,
1338  ARM::D4, ARM::D5, ARM::D6, ARM::D7,
1339  ARM::D8, ARM::D9, ARM::D10, ARM::D11,
1340  ARM::D12, ARM::D13, ARM::D14, ARM::D15,
1341  ARM::D16, ARM::D17, ARM::D18, ARM::D19,
1342  ARM::D20, ARM::D21, ARM::D22, ARM::D23,
1343  ARM::D24, ARM::D25, ARM::D26, ARM::D27,
1344  ARM::D28, ARM::D29, ARM::D30, ARM::D31
1345 };
1346 
1347 static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
1348  uint64_t Address, const void *Decoder) {
1349  const FeatureBitset &featureBits =
1350  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1351 
1352  bool hasD32 = featureBits[ARM::FeatureD32];
1353 
1354  if (RegNo > 31 || (!hasD32 && RegNo > 15))
1355  return MCDisassembler::Fail;
1356 
1357  unsigned Register = DPRDecoderTable[RegNo];
1358  Inst.addOperand(MCOperand::createReg(Register));
1359  return MCDisassembler::Success;
1360 }
1361 
1362 static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
1363  uint64_t Address, const void *Decoder) {
1364  if (RegNo > 7)
1365  return MCDisassembler::Fail;
1366  return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1367 }
1368 
1369 static DecodeStatus DecodeSPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
1370  uint64_t Address, const void *Decoder) {
1371  if (RegNo > 15)
1372  return MCDisassembler::Fail;
1373  return DecodeSPRRegisterClass(Inst, RegNo, Address, Decoder);
1374 }
1375 
1376 static DecodeStatus
1377 DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo,
1378  uint64_t Address, const void *Decoder) {
1379  if (RegNo > 15)
1380  return MCDisassembler::Fail;
1381  return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1382 }
1383 
1384 static const uint16_t QPRDecoderTable[] = {
1385  ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3,
1386  ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7,
1387  ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11,
1388  ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15
1389 };
1390 
1391 static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
1392  uint64_t Address, const void *Decoder) {
1393  if (RegNo > 31 || (RegNo & 1) != 0)
1394  return MCDisassembler::Fail;
1395  RegNo >>= 1;
1396 
1397  unsigned Register = QPRDecoderTable[RegNo];
1398  Inst.addOperand(MCOperand::createReg(Register));
1399  return MCDisassembler::Success;
1400 }
1401 
1402 static const uint16_t DPairDecoderTable[] = {
1403  ARM::Q0, ARM::D1_D2, ARM::Q1, ARM::D3_D4, ARM::Q2, ARM::D5_D6,
1404  ARM::Q3, ARM::D7_D8, ARM::Q4, ARM::D9_D10, ARM::Q5, ARM::D11_D12,
1405  ARM::Q6, ARM::D13_D14, ARM::Q7, ARM::D15_D16, ARM::Q8, ARM::D17_D18,
1406  ARM::Q9, ARM::D19_D20, ARM::Q10, ARM::D21_D22, ARM::Q11, ARM::D23_D24,
1407  ARM::Q12, ARM::D25_D26, ARM::Q13, ARM::D27_D28, ARM::Q14, ARM::D29_D30,
1408  ARM::Q15
1409 };
1410 
1411 static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
1412  uint64_t Address, const void *Decoder) {
1413  if (RegNo > 30)
1414  return MCDisassembler::Fail;
1415 
1416  unsigned Register = DPairDecoderTable[RegNo];
1417  Inst.addOperand(MCOperand::createReg(Register));
1418  return MCDisassembler::Success;
1419 }
1420 
1421 static const uint16_t DPairSpacedDecoderTable[] = {
1422  ARM::D0_D2, ARM::D1_D3, ARM::D2_D4, ARM::D3_D5,
1423  ARM::D4_D6, ARM::D5_D7, ARM::D6_D8, ARM::D7_D9,
1424  ARM::D8_D10, ARM::D9_D11, ARM::D10_D12, ARM::D11_D13,
1425  ARM::D12_D14, ARM::D13_D15, ARM::D14_D16, ARM::D15_D17,
1426  ARM::D16_D18, ARM::D17_D19, ARM::D18_D20, ARM::D19_D21,
1427  ARM::D20_D22, ARM::D21_D23, ARM::D22_D24, ARM::D23_D25,
1428  ARM::D24_D26, ARM::D25_D27, ARM::D26_D28, ARM::D27_D29,
1429  ARM::D28_D30, ARM::D29_D31
1430 };
1431 
1432 static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst &Inst,
1433  unsigned RegNo,
1434  uint64_t Address,
1435  const void *Decoder) {
1436  if (RegNo > 29)
1437  return MCDisassembler::Fail;
1438 
1439  unsigned Register = DPairSpacedDecoderTable[RegNo];
1440  Inst.addOperand(MCOperand::createReg(Register));
1441  return MCDisassembler::Success;
1442 }
1443 
1444 static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
1445  uint64_t Address, const void *Decoder) {
1446  DecodeStatus S = MCDisassembler::Success;
1447  if (Val == 0xF) return MCDisassembler::Fail;
1448  // AL predicate is not allowed on Thumb1 branches.
1449  if (Inst.getOpcode() == ARM::tBcc && Val == 0xE)
1450  return MCDisassembler::Fail;
1451  if (Val != ARMCC::AL && !ARMInsts[Inst.getOpcode()].isPredicable())
1452  Check(S, MCDisassembler::SoftFail);
1453  Inst.addOperand(MCOperand::createImm(Val));
1454  if (Val == ARMCC::AL) {
1455  Inst.addOperand(MCOperand::createReg(0));
1456  } else
1457  Inst.addOperand(MCOperand::createReg(ARM::CPSR));
1458  return S;
1459 }
1460 
1461 static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
1462  uint64_t Address, const void *Decoder) {
1463  if (Val)
1464  Inst.addOperand(MCOperand::createReg(ARM::CPSR));
1465  else
1466  Inst.addOperand(MCOperand::createReg(0));
1467  return MCDisassembler::Success;
1468 }
1469 
1470 static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Val,
1471  uint64_t Address, const void *Decoder) {
1472  DecodeStatus S = MCDisassembler::Success;
1473 
1474  unsigned Rm = fieldFromInstruction(Val, 0, 4);
1475  unsigned type = fieldFromInstruction(Val, 5, 2);
1476  unsigned imm = fieldFromInstruction(Val, 7, 5);
1477 
1478  // Register-immediate
1479  if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
1480  return MCDisassembler::Fail;
1481 
1482  ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1483  switch (type) {
1484  case 0:
1485  Shift = ARM_AM::lsl;
1486  break;
1487  case 1:
1488  Shift = ARM_AM::lsr;
1489  break;
1490  case 2:
1491  Shift = ARM_AM::asr;
1492  break;
1493  case 3:
1494  Shift = ARM_AM::ror;
1495  break;
1496  }
1497 
1498  if (Shift == ARM_AM::ror && imm == 0)
1499  Shift = ARM_AM::rrx;
1500 
1501  unsigned Op = Shift | (imm << 3);
1502  Inst.addOperand(MCOperand::createImm(Op));
1503 
1504  return S;
1505 }
1506 
1507 static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Val,
1508  uint64_t Address, const void *Decoder) {
1509  DecodeStatus S = MCDisassembler::Success;
1510 
1511  unsigned Rm = fieldFromInstruction(Val, 0, 4);
1512  unsigned type = fieldFromInstruction(Val, 5, 2);
1513  unsigned Rs = fieldFromInstruction(Val, 8, 4);
1514 
1515  // Register-register
1516  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1517  return MCDisassembler::Fail;
1518  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder)))
1519  return MCDisassembler::Fail;
1520 
1521  ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1522  switch (type) {
1523  case 0:
1524  Shift = ARM_AM::lsl;
1525  break;
1526  case 1:
1527  Shift = ARM_AM::lsr;
1528  break;
1529  case 2:
1530  Shift = ARM_AM::asr;
1531  break;
1532  case 3:
1533  Shift = ARM_AM::ror;
1534  break;
1535  }
1536 
1537  Inst.addOperand(MCOperand::createImm(Shift));
1538 
1539  return S;
1540 }
1541 
1542 static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
1543  uint64_t Address, const void *Decoder) {
1544  DecodeStatus S = MCDisassembler::Success;
1545 
1546  bool NeedDisjointWriteback = false;
1547  unsigned WritebackReg = 0;
1548  bool CLRM = false;
1549  switch (Inst.getOpcode()) {
1550  default:
1551  break;
1552  case ARM::LDMIA_UPD:
1553  case ARM::LDMDB_UPD:
1554  case ARM::LDMIB_UPD:
1555  case ARM::LDMDA_UPD:
1556  case ARM::t2LDMIA_UPD:
1557  case ARM::t2LDMDB_UPD:
1558  case ARM::t2STMIA_UPD:
1559  case ARM::t2STMDB_UPD:
1560  NeedDisjointWriteback = true;
1561  WritebackReg = Inst.getOperand(0).getReg();
1562  break;
1563  case ARM::t2CLRM:
1564  CLRM = true;
1565  break;
1566  }
1567 
1568  // Empty register lists are not allowed.
1569  if (Val == 0) return MCDisassembler::Fail;
1570  for (unsigned i = 0; i < 16; ++i) {
1571  if (Val & (1 << i)) {
1572  if (CLRM) {
1573  if (!Check(S, DecodeCLRMGPRRegisterClass(Inst, i, Address, Decoder))) {
1574  return MCDisassembler::Fail;
1575  }
1576  } else {
1577  if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder)))
1578  return MCDisassembler::Fail;
1579  // Writeback not allowed if Rn is in the target list.
1580  if (NeedDisjointWriteback && WritebackReg == Inst.end()[-1].getReg())
1581  Check(S, MCDisassembler::SoftFail);
1582  }
1583  }
1584  }
1585 
1586  return S;
1587 }
1588 
1589 static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
1590  uint64_t Address, const void *Decoder) {
1591  DecodeStatus S = MCDisassembler::Success;
1592 
1593  unsigned Vd = fieldFromInstruction(Val, 8, 5);
1594  unsigned regs = fieldFromInstruction(Val, 0, 8);
1595 
1596  // In case of unpredictable encoding, tweak the operands.
1597  if (regs == 0 || (Vd + regs) > 32) {
1598  regs = Vd + regs > 32 ? 32 - Vd : regs;
1599  regs = std::max( 1u, regs);
1600  S = MCDisassembler::SoftFail;
1601  }
1602 
1603  if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder)))
1604  return MCDisassembler::Fail;
1605  for (unsigned i = 0; i < (regs - 1); ++i) {
1606  if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1607  return MCDisassembler::Fail;
1608  }
1609 
1610  return S;
1611 }
1612 
1613 static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
1614  uint64_t Address, const void *Decoder) {
1615  DecodeStatus S = MCDisassembler::Success;
1616 
1617  unsigned Vd = fieldFromInstruction(Val, 8, 5);
1618  unsigned regs = fieldFromInstruction(Val, 1, 7);
1619 
1620  // In case of unpredictable encoding, tweak the operands.
1621  if (regs == 0 || regs > 16 || (Vd + regs) > 32) {
1622  regs = Vd + regs > 32 ? 32 - Vd : regs;
1623  regs = std::max( 1u, regs);
1624  regs = std::min(16u, regs);
1625  S = MCDisassembler::SoftFail;
1626  }
1627 
1628  if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
1629  return MCDisassembler::Fail;
1630  for (unsigned i = 0; i < (regs - 1); ++i) {
1631  if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1632  return MCDisassembler::Fail;
1633  }
1634 
1635  return S;
1636 }
1637 
1638 static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Val,
1639  uint64_t Address, const void *Decoder) {
1640  // This operand encodes a mask of contiguous zeros between a specified MSB
1641  // and LSB. To decode it, we create the mask of all bits MSB-and-lower,
1642  // the mask of all bits LSB-and-lower, and then xor them to create
1643  // the mask of that's all ones on [msb, lsb]. Finally we not it to
1644  // create the final mask.
1645  unsigned msb = fieldFromInstruction(Val, 5, 5);
1646  unsigned lsb = fieldFromInstruction(Val, 0, 5);
1647 
1648  DecodeStatus S = MCDisassembler::Success;
1649  if (lsb > msb) {
1650  Check(S, MCDisassembler::SoftFail);
1651  // The check above will cause the warning for the "potentially undefined
1652  // instruction encoding" but we can't build a bad MCOperand value here
1653  // with a lsb > msb or else printing the MCInst will cause a crash.
1654  lsb = msb;
1655  }
1656 
1657  uint32_t msb_mask = 0xFFFFFFFF;
1658  if (msb != 31) msb_mask = (1U << (msb+1)) - 1;
1659  uint32_t lsb_mask = (1U << lsb) - 1;
1660 
1661  Inst.addOperand(MCOperand::createImm(~(msb_mask ^ lsb_mask)));
1662  return S;
1663 }
1664 
1665 static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
1666  uint64_t Address, const void *Decoder) {
1667  DecodeStatus S = MCDisassembler::Success;
1668 
1669  unsigned pred = fieldFromInstruction(Insn, 28, 4);
1670  unsigned CRd = fieldFromInstruction(Insn, 12, 4);
1671  unsigned coproc = fieldFromInstruction(Insn, 8, 4);
1672  unsigned imm = fieldFromInstruction(Insn, 0, 8);
1673  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1674  unsigned U = fieldFromInstruction(Insn, 23, 1);
1675  const FeatureBitset &featureBits =
1676  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1677 
1678  switch (Inst.getOpcode()) {
1679  case ARM::LDC_OFFSET:
1680  case ARM::LDC_PRE:
1681  case ARM::LDC_POST:
1682  case ARM::LDC_OPTION:
1683  case ARM::LDCL_OFFSET:
1684  case ARM::LDCL_PRE:
1685  case ARM::LDCL_POST:
1686  case ARM::LDCL_OPTION:
1687  case ARM::STC_OFFSET:
1688  case ARM::STC_PRE:
1689  case ARM::STC_POST:
1690  case ARM::STC_OPTION:
1691  case ARM::STCL_OFFSET:
1692  case ARM::STCL_PRE:
1693  case ARM::STCL_POST:
1694  case ARM::STCL_OPTION:
1695  case ARM::t2LDC_OFFSET:
1696  case ARM::t2LDC_PRE:
1697  case ARM::t2LDC_POST:
1698  case ARM::t2LDC_OPTION:
1699  case ARM::t2LDCL_OFFSET:
1700  case ARM::t2LDCL_PRE:
1701  case ARM::t2LDCL_POST:
1702  case ARM::t2LDCL_OPTION:
1703  case ARM::t2STC_OFFSET:
1704  case ARM::t2STC_PRE:
1705  case ARM::t2STC_POST:
1706  case ARM::t2STC_OPTION:
1707  case ARM::t2STCL_OFFSET:
1708  case ARM::t2STCL_PRE:
1709  case ARM::t2STCL_POST:
1710  case ARM::t2STCL_OPTION:
1711  case ARM::t2LDC2_OFFSET:
1712  case ARM::t2LDC2L_OFFSET:
1713  case ARM::t2LDC2_PRE:
1714  case ARM::t2LDC2L_PRE:
1715  case ARM::t2STC2_OFFSET:
1716  case ARM::t2STC2L_OFFSET:
1717  case ARM::t2STC2_PRE:
1718  case ARM::t2STC2L_PRE:
1719  case ARM::LDC2_OFFSET:
1720  case ARM::LDC2L_OFFSET:
1721  case ARM::LDC2_PRE:
1722  case ARM::LDC2L_PRE:
1723  case ARM::STC2_OFFSET:
1724  case ARM::STC2L_OFFSET:
1725  case ARM::STC2_PRE:
1726  case ARM::STC2L_PRE:
1727  case ARM::t2LDC2_OPTION:
1728  case ARM::t2STC2_OPTION:
1729  case ARM::t2LDC2_POST:
1730  case ARM::t2LDC2L_POST:
1731  case ARM::t2STC2_POST:
1732  case ARM::t2STC2L_POST:
1733  case ARM::LDC2_POST:
1734  case ARM::LDC2L_POST:
1735  case ARM::STC2_POST:
1736  case ARM::STC2L_POST:
1737  if (coproc == 0xA || coproc == 0xB ||
1738  (featureBits[ARM::HasV8_1MMainlineOps] &&
1739  (coproc == 0x8 || coproc == 0x9 || coproc == 0xA || coproc == 0xB ||
1740  coproc == 0xE || coproc == 0xF)))
1741  return MCDisassembler::Fail;
1742  break;
1743  default:
1744  break;
1745  }
1746 
1747  if (featureBits[ARM::HasV8Ops] && (coproc != 14))
1748  return MCDisassembler::Fail;
1749 
1750  Inst.addOperand(MCOperand::createImm(coproc));
1751  Inst.addOperand(MCOperand::createImm(CRd));
1752  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1753  return MCDisassembler::Fail;
1754 
1755  switch (Inst.getOpcode()) {
1756  case ARM::t2LDC2_OFFSET:
1757  case ARM::t2LDC2L_OFFSET:
1758  case ARM::t2LDC2_PRE:
1759  case ARM::t2LDC2L_PRE:
1760  case ARM::t2STC2_OFFSET:
1761  case ARM::t2STC2L_OFFSET:
1762  case ARM::t2STC2_PRE:
1763  case ARM::t2STC2L_PRE:
1764  case ARM::LDC2_OFFSET:
1765  case ARM::LDC2L_OFFSET:
1766  case ARM::LDC2_PRE:
1767  case ARM::LDC2L_PRE:
1768  case ARM::STC2_OFFSET:
1769  case ARM::STC2L_OFFSET:
1770  case ARM::STC2_PRE:
1771  case ARM::STC2L_PRE:
1772  case ARM::t2LDC_OFFSET:
1773  case ARM::t2LDCL_OFFSET:
1774  case ARM::t2LDC_PRE:
1775  case ARM::t2LDCL_PRE:
1776  case ARM::t2STC_OFFSET:
1777  case ARM::t2STCL_OFFSET:
1778  case ARM::t2STC_PRE:
1779  case ARM::t2STCL_PRE:
1780  case ARM::LDC_OFFSET:
1781  case ARM::LDCL_OFFSET:
1782  case ARM::LDC_PRE:
1783  case ARM::LDCL_PRE:
1784  case ARM::STC_OFFSET:
1785  case ARM::STCL_OFFSET:
1786  case ARM::STC_PRE:
1787  case ARM::STCL_PRE:
1788  imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm);
1789  Inst.addOperand(MCOperand::createImm(imm));
1790  break;
1791  case ARM::t2LDC2_POST:
1792  case ARM::t2LDC2L_POST:
1793  case ARM::t2STC2_POST:
1794  case ARM::t2STC2L_POST:
1795  case ARM::LDC2_POST:
1796  case ARM::LDC2L_POST:
1797  case ARM::STC2_POST:
1798  case ARM::STC2L_POST:
1799  case ARM::t2LDC_POST:
1800  case ARM::t2LDCL_POST:
1801  case ARM::t2STC_POST:
1802  case ARM::t2STCL_POST:
1803  case ARM::LDC_POST:
1804  case ARM::LDCL_POST:
1805  case ARM::STC_POST:
1806  case ARM::STCL_POST:
1807  imm |= U << 8;
1808  LLVM_FALLTHROUGH;
1809  default:
1810  // The 'option' variant doesn't encode 'U' in the immediate since
1811  // the immediate is unsigned [0,255].
1812  Inst.addOperand(MCOperand::createImm(imm));
1813  break;
1814  }
1815 
1816  switch (Inst.getOpcode()) {
1817  case ARM::LDC_OFFSET:
1818  case ARM::LDC_PRE:
1819  case ARM::LDC_POST:
1820  case ARM::LDC_OPTION:
1821  case ARM::LDCL_OFFSET:
1822  case ARM::LDCL_PRE:
1823  case ARM::LDCL_POST:
1824  case ARM::LDCL_OPTION:
1825  case ARM::STC_OFFSET:
1826  case ARM::STC_PRE:
1827  case ARM::STC_POST:
1828  case ARM::STC_OPTION:
1829  case ARM::STCL_OFFSET:
1830  case ARM::STCL_PRE:
1831  case ARM::STCL_POST:
1832  case ARM::STCL_OPTION:
1833  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1834  return MCDisassembler::Fail;
1835  break;
1836  default:
1837  break;
1838  }
1839 
1840  return S;
1841 }
1842 
1843 static DecodeStatus
1844 DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn,
1845  uint64_t Address, const void *Decoder) {
1846  DecodeStatus S = MCDisassembler::Success;
1847 
1848  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1849  unsigned Rt = fieldFromInstruction(Insn, 12, 4);
1850  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
1851  unsigned imm = fieldFromInstruction(Insn, 0, 12);
1852  unsigned pred = fieldFromInstruction(Insn, 28, 4);
1853  unsigned reg = fieldFromInstruction(Insn, 25, 1);
1854  unsigned P = fieldFromInstruction(Insn, 24, 1);
1855  unsigned W = fieldFromInstruction(Insn, 21, 1);
1856 
1857  // On stores, the writeback operand precedes Rt.
1858  switch (Inst.getOpcode()) {
1859  case ARM::STR_POST_IMM:
1860  case ARM::STR_POST_REG:
1861  case ARM::STRB_POST_IMM:
1862  case ARM::STRB_POST_REG:
1863  case ARM::STRT_POST_REG:
1864  case ARM::STRT_POST_IMM:
1865  case ARM::STRBT_POST_REG:
1866  case ARM::STRBT_POST_IMM:
1867  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1868  return MCDisassembler::Fail;
1869  break;
1870  default:
1871  break;
1872  }
1873 
1874  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
1875  return MCDisassembler::Fail;
1876 
1877  // On loads, the writeback operand comes after Rt.
1878  switch (Inst.getOpcode()) {
1879  case ARM::LDR_POST_IMM:
1880  case ARM::LDR_POST_REG:
1881  case ARM::LDRB_POST_IMM:
1882  case ARM::LDRB_POST_REG:
1883  case ARM::LDRBT_POST_REG:
1884  case ARM::LDRBT_POST_IMM:
1885  case ARM::LDRT_POST_REG:
1886  case ARM::LDRT_POST_IMM:
1887  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1888  return MCDisassembler::Fail;
1889  break;
1890  default:
1891  break;
1892  }
1893 
1894  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1895  return MCDisassembler::Fail;
1896 
1897  ARM_AM::AddrOpc Op = ARM_AM::add;
1898  if (!fieldFromInstruction(Insn, 23, 1))
1899  Op = ARM_AM::sub;
1900 
1901  bool writeback = (P == 0) || (W == 1);
1902  unsigned idx_mode = 0;
1903  if (P && writeback)
1904  idx_mode = ARMII::IndexModePre;
1905  else if (!P && writeback)
1906  idx_mode = ARMII::IndexModePost;
1907 
1908  if (writeback && (Rn == 15 || Rn == Rt))
1909  S = MCDisassembler::SoftFail; // UNPREDICTABLE
1910 
1911  if (reg) {
1912  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1913  return MCDisassembler::Fail;
1914  ARM_AM::ShiftOpc Opc = ARM_AM::lsl;
1915  switch( fieldFromInstruction(Insn, 5, 2)) {
1916  case 0:
1917  Opc = ARM_AM::lsl;
1918  break;
1919  case 1:
1920  Opc = ARM_AM::lsr;
1921  break;
1922  case 2:
1923  Opc = ARM_AM::asr;
1924  break;
1925  case 3:
1926  Opc = ARM_AM::ror;
1927  break;
1928  default:
1929  return MCDisassembler::Fail;
1930  }
1931  unsigned amt = fieldFromInstruction(Insn, 7, 5);
1932  if (Opc == ARM_AM::ror && amt == 0)
1933  Opc = ARM_AM::rrx;
1934  unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode);
1935 
1936  Inst.addOperand(MCOperand::createImm(imm));
1937  } else {
1938  Inst.addOperand(MCOperand::createReg(0));
1939  unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode);
1940  Inst.addOperand(MCOperand::createImm(tmp));
1941  }
1942 
1943  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1944  return MCDisassembler::Fail;
1945 
1946  return S;
1947 }
1948 
1949 static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Val,
1950  uint64_t Address, const void *Decoder) {
1951  DecodeStatus S = MCDisassembler::Success;
1952 
1953  unsigned Rn = fieldFromInstruction(Val, 13, 4);
1954  unsigned Rm = fieldFromInstruction(Val, 0, 4);
1955  unsigned type = fieldFromInstruction(Val, 5, 2);
1956  unsigned imm = fieldFromInstruction(Val, 7, 5);
1957  unsigned U = fieldFromInstruction(Val, 12, 1);
1958 
1959  ARM_AM::ShiftOpc ShOp = ARM_AM::lsl;
1960  switch (type) {
1961  case 0:
1962  ShOp = ARM_AM::lsl;
1963  break;
1964  case 1:
1965  ShOp = ARM_AM::lsr;
1966  break;
1967  case 2:
1968  ShOp = ARM_AM::asr;
1969  break;
1970  case 3:
1971  ShOp = ARM_AM::ror;
1972  break;
1973  }
1974 
1975  if (ShOp == ARM_AM::ror && imm == 0)
1976  ShOp = ARM_AM::rrx;
1977 
1978  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1979  return MCDisassembler::Fail;
1980  if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
1981  return MCDisassembler::Fail;
1982  unsigned shift;
1983  if (U)
1984  shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp);
1985  else
1986  shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp);
1987  Inst.addOperand(MCOperand::createImm(shift));
1988 
1989  return S;
1990 }
1991 
1992 static DecodeStatus
1993 DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn,
1994  uint64_t Address, const void *Decoder) {
1995  DecodeStatus S = MCDisassembler::Success;
1996 
1997  unsigned Rt = fieldFromInstruction(Insn, 12, 4);
1998  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1999  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2000  unsigned type = fieldFromInstruction(Insn, 22, 1);
2001  unsigned imm = fieldFromInstruction(Insn, 8, 4);
2002  unsigned U = ((~fieldFromInstruction(Insn, 23, 1)) & 1) << 8;
2003  unsigned pred = fieldFromInstruction(Insn, 28, 4);
2004  unsigned W = fieldFromInstruction(Insn, 21, 1);
2005  unsigned P = fieldFromInstruction(Insn, 24, 1);
2006  unsigned Rt2 = Rt + 1;
2007 
2008  bool writeback = (W == 1) | (P == 0);
2009 
2010  // For {LD,ST}RD, Rt must be even, else undefined.
2011  switch (Inst.getOpcode()) {
2012  case ARM::STRD:
2013  case ARM::STRD_PRE:
2014  case ARM::STRD_POST:
2015  case ARM::LDRD:
2016  case ARM::LDRD_PRE:
2017  case ARM::LDRD_POST:
2018  if (Rt & 0x1) S = MCDisassembler::SoftFail;
2019  break;
2020  default:
2021  break;
2022  }
2023  switch (Inst.getOpcode()) {
2024  case ARM::STRD:
2025  case ARM::STRD_PRE:
2026  case ARM::STRD_POST:
2027  if (P == 0 && W == 1)
2028  S = MCDisassembler::SoftFail;
2029 
2030  if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2))
2031  S = MCDisassembler::SoftFail;
2032  if (type && Rm == 15)
2033  S = MCDisassembler::SoftFail;
2034  if (Rt2 == 15)
2035  S = MCDisassembler::SoftFail;
2036  if (!type && fieldFromInstruction(Insn, 8, 4))
2037  S = MCDisassembler::SoftFail;
2038  break;
2039  case ARM::STRH:
2040  case ARM::STRH_PRE:
2041  case ARM::STRH_POST:
2042  if (Rt == 15)
2043  S = MCDisassembler::SoftFail;
2044  if (writeback && (Rn == 15 || Rn == Rt))
2045  S = MCDisassembler::SoftFail;
2046  if (!type && Rm == 15)
2047  S = MCDisassembler::SoftFail;
2048  break;
2049  case ARM::LDRD:
2050  case ARM::LDRD_PRE:
2051  case ARM::LDRD_POST:
2052  if (type && Rn == 15) {
2053  if (Rt2 == 15)
2054  S = MCDisassembler::SoftFail;
2055  break;
2056  }
2057  if (P == 0 && W == 1)
2058  S = MCDisassembler::SoftFail;
2059  if (!type && (Rt2 == 15 || Rm == 15 || Rm == Rt || Rm == Rt2))
2060  S = MCDisassembler::SoftFail;
2061  if (!type && writeback && Rn == 15)
2062  S = MCDisassembler::SoftFail;
2063  if (writeback && (Rn == Rt || Rn == Rt2))
2064  S = MCDisassembler::SoftFail;
2065  break;
2066  case ARM::LDRH:
2067  case ARM::LDRH_PRE:
2068  case ARM::LDRH_POST:
2069  if (type && Rn == 15) {
2070  if (Rt == 15)
2071  S = MCDisassembler::SoftFail;
2072  break;
2073  }
2074  if (Rt == 15)
2075  S = MCDisassembler::SoftFail;
2076  if (!type && Rm == 15)
2077  S = MCDisassembler::SoftFail;
2078  if (!type && writeback && (Rn == 15 || Rn == Rt))
2079  S = MCDisassembler::SoftFail;
2080  break;
2081  case ARM::LDRSH:
2082  case ARM::LDRSH_PRE:
2083  case ARM::LDRSH_POST:
2084  case ARM::LDRSB:
2085  case ARM::LDRSB_PRE:
2086  case ARM::LDRSB_POST:
2087  if (type && Rn == 15) {
2088  if (Rt == 15)
2089  S = MCDisassembler::SoftFail;
2090  break;
2091  }
2092  if (type && (Rt == 15 || (writeback && Rn == Rt)))
2093  S = MCDisassembler::SoftFail;
2094  if (!type && (Rt == 15 || Rm == 15))
2095  S = MCDisassembler::SoftFail;
2096  if (!type && writeback && (Rn == 15 || Rn == Rt))
2097  S = MCDisassembler::SoftFail;
2098  break;
2099  default:
2100  break;
2101  }
2102 
2103  if (writeback) { // Writeback
2104  if (P)
2105  U |= ARMII::IndexModePre << 9;
2106  else
2107  U |= ARMII::IndexModePost << 9;
2108 
2109  // On stores, the writeback operand precedes Rt.
2110  switch (Inst.getOpcode()) {
2111  case ARM::STRD:
2112  case ARM::STRD_PRE:
2113  case ARM::STRD_POST:
2114  case ARM::STRH:
2115  case ARM::STRH_PRE:
2116  case ARM::STRH_POST:
2117  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2118  return MCDisassembler::Fail;
2119  break;
2120  default:
2121  break;
2122  }
2123  }
2124 
2125  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
2126  return MCDisassembler::Fail;
2127  switch (Inst.getOpcode()) {
2128  case ARM::STRD:
2129  case ARM::STRD_PRE:
2130  case ARM::STRD_POST:
2131  case ARM::LDRD:
2132  case ARM::LDRD_PRE:
2133  case ARM::LDRD_POST:
2134  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder)))
2135  return MCDisassembler::Fail;
2136  break;
2137  default:
2138  break;
2139  }
2140 
2141  if (writeback) {
2142  // On loads, the writeback operand comes after Rt.
2143  switch (Inst.getOpcode()) {
2144  case ARM::LDRD:
2145  case ARM::LDRD_PRE:
2146  case ARM::LDRD_POST:
2147  case ARM::LDRH:
2148  case ARM::LDRH_PRE:
2149  case ARM::LDRH_POST:
2150  case ARM::LDRSH:
2151  case ARM::LDRSH_PRE:
2152  case ARM::LDRSH_POST:
2153  case ARM::LDRSB:
2154  case ARM::LDRSB_PRE:
2155  case ARM::LDRSB_POST:
2156  case ARM::LDRHTr:
2157  case ARM::LDRSBTr:
2158  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2159  return MCDisassembler::Fail;
2160  break;
2161  default:
2162  break;
2163  }
2164  }
2165 
2166  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2167  return MCDisassembler::Fail;
2168 
2169  if (type) {
2170  Inst.addOperand(MCOperand::createReg(0));
2171  Inst.addOperand(MCOperand::createImm(U | (imm << 4) | Rm));
2172  } else {
2173  if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2174  return MCDisassembler::Fail;
2175  Inst.addOperand(MCOperand::createImm(U));
2176  }
2177 
2178  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2179  return MCDisassembler::Fail;
2180 
2181  return S;
2182 }
2183 
2184 static DecodeStatus DecodeRFEInstruction(MCInst &Inst, unsigned Insn,
2185  uint64_t Address, const void *Decoder) {
2186  DecodeStatus S = MCDisassembler::Success;
2187 
2188  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2189  unsigned mode = fieldFromInstruction(Insn, 23, 2);
2190 
2191  switch (mode) {
2192  case 0:
2193  mode = ARM_AM::da;
2194  break;
2195  case 1:
2196  mode = ARM_AM::ia;
2197  break;
2198  case 2:
2199  mode = ARM_AM::db;
2200  break;
2201  case 3:
2202  mode = ARM_AM::ib;
2203  break;
2204  }
2205 
2206  Inst.addOperand(MCOperand::createImm(mode));
2207  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2208  return MCDisassembler::Fail;
2209 
2210  return S;
2211 }
2212 
2213 static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
2214  uint64_t Address, const void *Decoder) {
2215  DecodeStatus S = MCDisassembler::Success;
2216 
2217  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2218  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2219  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2220  unsigned pred = fieldFromInstruction(Insn, 28, 4);
2221 
2222  if (pred == 0xF)
2223  return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2224 
2225  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2226  return MCDisassembler::Fail;
2227  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2228  return MCDisassembler::Fail;
2229  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2230  return MCDisassembler::Fail;
2231  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2232  return MCDisassembler::Fail;
2233  return S;
2234 }
2235 
2236 static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst &Inst,
2237  unsigned Insn,
2238  uint64_t Address, const void *Decoder) {
2239  DecodeStatus S = MCDisassembler::Success;
2240 
2241  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2242  unsigned pred = fieldFromInstruction(Insn, 28, 4);
2243  unsigned reglist = fieldFromInstruction(Insn, 0, 16);
2244 
2245  if (pred == 0xF) {
2246  // Ambiguous with RFE and SRS
2247  switch (Inst.getOpcode()) {
2248  case ARM::LDMDA:
2249  Inst.setOpcode(ARM::RFEDA);
2250  break;
2251  case ARM::LDMDA_UPD:
2252  Inst.setOpcode(ARM::RFEDA_UPD);
2253  break;
2254  case ARM::LDMDB:
2255  Inst.setOpcode(ARM::RFEDB);
2256  break;
2257  case ARM::LDMDB_UPD:
2258  Inst.setOpcode(ARM::RFEDB_UPD);
2259  break;
2260  case ARM::LDMIA:
2261  Inst.setOpcode(ARM::RFEIA);
2262  break;
2263  case ARM::LDMIA_UPD:
2264  Inst.setOpcode(ARM::RFEIA_UPD);
2265  break;
2266  case ARM::LDMIB:
2267  Inst.setOpcode(ARM::RFEIB);
2268  break;
2269  case ARM::LDMIB_UPD:
2270  Inst.setOpcode(ARM::RFEIB_UPD);
2271  break;
2272  case ARM::STMDA:
2273  Inst.setOpcode(ARM::SRSDA);
2274  break;
2275  case ARM::STMDA_UPD:
2276  Inst.setOpcode(ARM::SRSDA_UPD);
2277  break;
2278  case ARM::STMDB:
2279  Inst.setOpcode(ARM::SRSDB);
2280  break;
2281  case ARM::STMDB_UPD:
2282  Inst.setOpcode(ARM::SRSDB_UPD);
2283  break;
2284  case ARM::STMIA:
2285  Inst.setOpcode(ARM::SRSIA);
2286  break;
2287  case ARM::STMIA_UPD:
2288  Inst.setOpcode(ARM::SRSIA_UPD);
2289  break;
2290  case ARM::STMIB:
2291  Inst.setOpcode(ARM::SRSIB);
2292  break;
2293  case ARM::STMIB_UPD:
2294  Inst.setOpcode(ARM::SRSIB_UPD);
2295  break;
2296  default:
2297  return MCDisassembler::Fail;
2298  }
2299 
2300  // For stores (which become SRS's, the only operand is the mode.
2301  if (fieldFromInstruction(Insn, 20, 1) == 0) {
2302  // Check SRS encoding constraints
2303  if (!(fieldFromInstruction(Insn, 22, 1) == 1 &&
2304  fieldFromInstruction(Insn, 20, 1) == 0))
2305  return MCDisassembler::Fail;
2306 
2307  Inst.addOperand(
2308  MCOperand::createImm(fieldFromInstruction(Insn, 0, 4)));
2309  return S;
2310  }
2311 
2312  return DecodeRFEInstruction(Inst, Insn, Address, Decoder);
2313  }
2314 
2315  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2316  return MCDisassembler::Fail;
2317  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2318  return MCDisassembler::Fail; // Tied
2319  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2320  return MCDisassembler::Fail;
2321  if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder)))
2322  return MCDisassembler::Fail;
2323 
2324  return S;
2325 }
2326 
2327 // Check for UNPREDICTABLE predicated ESB instruction
2328 static DecodeStatus DecodeHINTInstruction(MCInst &Inst, unsigned Insn,
2329  uint64_t Address, const void *Decoder) {
2330  unsigned pred = fieldFromInstruction(Insn, 28, 4);
2331  unsigned imm8 = fieldFromInstruction(Insn, 0, 8);
2332  const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
2333  const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits();
2334 
2335  DecodeStatus S = MCDisassembler::Success;
2336 
2337  Inst.addOperand(MCOperand::createImm(imm8));
2338 
2339  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2340  return MCDisassembler::Fail;
2341 
2342  // ESB is unpredictable if pred != AL. Without the RAS extension, it is a NOP,
2343  // so all predicates should be allowed.
2344  if (imm8 == 0x10 && pred != 0xe && ((FeatureBits[ARM::FeatureRAS]) != 0))
2345  S = MCDisassembler::SoftFail;
2346 
2347  return S;
2348 }
2349 
2350 static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
2351  uint64_t Address, const void *Decoder) {
2352  unsigned imod = fieldFromInstruction(Insn, 18, 2);
2353  unsigned M = fieldFromInstruction(Insn, 17, 1);
2354  unsigned iflags = fieldFromInstruction(Insn, 6, 3);
2355  unsigned mode = fieldFromInstruction(Insn, 0, 5);
2356 
2357  DecodeStatus S = MCDisassembler::Success;
2358 
2359  // This decoder is called from multiple location that do not check
2360  // the full encoding is valid before they do.
2361  if (fieldFromInstruction(Insn, 5, 1) != 0 ||
2362  fieldFromInstruction(Insn, 16, 1) != 0 ||
2363  fieldFromInstruction(Insn, 20, 8) != 0x10)
2364  return MCDisassembler::Fail;
2365 
2366  // imod == '01' --> UNPREDICTABLE
2367  // NOTE: Even though this is technically UNPREDICTABLE, we choose to
2368  // return failure here. The '01' imod value is unprintable, so there's
2369  // nothing useful we could do even if we returned UNPREDICTABLE.
2370 
2371  if (imod == 1) return MCDisassembler::Fail;
2372 
2373  if (imod && M) {
2374  Inst.setOpcode(ARM::CPS3p);
2375  Inst.addOperand(MCOperand::createImm(imod));
2376  Inst.addOperand(MCOperand::createImm(iflags));
2377  Inst.addOperand(MCOperand::createImm(mode));
2378  } else if (imod && !M) {
2379  Inst.setOpcode(ARM::CPS2p);
2380  Inst.addOperand(MCOperand::createImm(imod));
2381  Inst.addOperand(MCOperand::createImm(iflags));
2382  if (mode) S = MCDisassembler::SoftFail;
2383  } else if (!imod && M) {
2384  Inst.setOpcode(ARM::CPS1p);
2385  Inst.addOperand(MCOperand::createImm(mode));
2386  if (iflags) S = MCDisassembler::SoftFail;
2387  } else {
2388  // imod == '00' && M == '0' --> UNPREDICTABLE
2389  Inst.setOpcode(ARM::CPS1p);
2390  Inst.addOperand(MCOperand::createImm(mode));
2391  S = MCDisassembler::SoftFail;
2392  }
2393 
2394  return S;
2395 }
2396 
2397 static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
2398  uint64_t Address, const void *Decoder) {
2399  unsigned imod = fieldFromInstruction(Insn, 9, 2);
2400  unsigned M = fieldFromInstruction(Insn, 8, 1);
2401  unsigned iflags = fieldFromInstruction(Insn, 5, 3);
2402  unsigned mode = fieldFromInstruction(Insn, 0, 5);
2403 
2404  DecodeStatus S = MCDisassembler::Success;
2405 
2406  // imod == '01' --> UNPREDICTABLE
2407  // NOTE: Even though this is technically UNPREDICTABLE, we choose to
2408  // return failure here. The '01' imod value is unprintable, so there's
2409  // nothing useful we could do even if we returned UNPREDICTABLE.
2410 
2411  if (imod == 1) return MCDisassembler::Fail;
2412 
2413  if (imod && M) {
2414  Inst.setOpcode(ARM::t2CPS3p);
2415  Inst.addOperand(MCOperand::createImm(imod));
2416  Inst.addOperand(MCOperand::createImm(iflags));
2417  Inst.addOperand(MCOperand::createImm(mode));
2418  } else if (imod && !M) {
2419  Inst.setOpcode(ARM::t2CPS2p);
2420  Inst.addOperand(MCOperand::createImm(imod));
2421  Inst.addOperand(MCOperand::createImm(iflags));
2422  if (mode) S = MCDisassembler::SoftFail;
2423  } else if (!imod && M) {
2424  Inst.setOpcode(ARM::t2CPS1p);
2425  Inst.addOperand(MCOperand::createImm(mode));
2426  if (iflags) S = MCDisassembler::SoftFail;
2427  } else {
2428  // imod == '00' && M == '0' --> this is a HINT instruction
2429  int imm = fieldFromInstruction(Insn, 0, 8);
2430  // HINT are defined only for immediate in [0..4]
2431  if(imm > 4) return MCDisassembler::Fail;
2432  Inst.setOpcode(ARM::t2HINT);
2433  Inst.addOperand(MCOperand::createImm(imm));
2434  }
2435 
2436  return S;
2437 }
2438 
2439 static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
2440  uint64_t Address, const void *Decoder) {
2441  DecodeStatus S = MCDisassembler::Success;
2442 
2443  unsigned Rd = fieldFromInstruction(Insn, 8, 4);
2444  unsigned imm = 0;
2445 
2446  imm |= (fieldFromInstruction(Insn, 0, 8) << 0);
2447  imm |= (fieldFromInstruction(Insn, 12, 3) << 8);
2448  imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2449  imm |= (fieldFromInstruction(Insn, 26, 1) << 11);
2450 
2451  if (Inst.getOpcode() == ARM::t2MOVTi16)
2452  if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2453  return MCDisassembler::Fail;
2454  if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2455  return MCDisassembler::Fail;
2456 
2457  if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2458  Inst.addOperand(MCOperand::createImm(imm));
2459 
2460  return S;
2461 }
2462 
2463 static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
2464  uint64_t Address, const void *Decoder) {
2465  DecodeStatus S = MCDisassembler::Success;
2466 
2467  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2468  unsigned pred = fieldFromInstruction(Insn, 28, 4);
2469  unsigned imm = 0;
2470 
2471  imm |= (fieldFromInstruction(Insn, 0, 12) << 0);
2472  imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2473 
2474  if (Inst.getOpcode() == ARM::MOVTi16)
2475  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2476  return MCDisassembler::Fail;
2477 
2478  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2479  return MCDisassembler::Fail;
2480 
2481  if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2482  Inst.addOperand(MCOperand::createImm(imm));
2483 
2484  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2485  return MCDisassembler::Fail;
2486 
2487  return S;
2488 }
2489 
2490 static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
2491  uint64_t Address, const void *Decoder) {
2492  DecodeStatus S = MCDisassembler::Success;
2493 
2494  unsigned Rd = fieldFromInstruction(Insn, 16, 4);
2495  unsigned Rn = fieldFromInstruction(Insn, 0, 4);
2496  unsigned Rm = fieldFromInstruction(Insn, 8, 4);
2497  unsigned Ra = fieldFromInstruction(Insn, 12, 4);
2498  unsigned pred = fieldFromInstruction(Insn, 28, 4);
2499 
2500  if (pred == 0xF)
2501  return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2502 
2503  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2504  return MCDisassembler::Fail;
2505  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2506  return MCDisassembler::Fail;
2507  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2508  return MCDisassembler::Fail;
2509  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder)))
2510  return MCDisassembler::Fail;
2511 
2512  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2513  return MCDisassembler::Fail;
2514 
2515  return S;
2516 }
2517 
2518 static DecodeStatus DecodeTSTInstruction(MCInst &Inst, unsigned Insn,
2519  uint64_t Address, const void *Decoder) {
2520  DecodeStatus S = MCDisassembler::Success;
2521 
2522  unsigned Pred = fieldFromInstruction(Insn, 28, 4);
2523  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2524  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2525 
2526  if (Pred == 0xF)
2527  return DecodeSETPANInstruction(Inst, Insn, Address, Decoder);
2528 
2529  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2530  return MCDisassembler::Fail;
2531  if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2532  return MCDisassembler::Fail;
2533  if (!Check(S, DecodePredicateOperand(Inst, Pred, Address, Decoder)))
2534  return MCDisassembler::Fail;
2535 
2536  return S;
2537 }
2538 
2539 static DecodeStatus DecodeSETPANInstruction(MCInst &Inst, unsigned Insn,
2540  uint64_t Address, const void *Decoder) {
2541  DecodeStatus S = MCDisassembler::Success;
2542 
2543  unsigned Imm = fieldFromInstruction(Insn, 9, 1);
2544 
2545  const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
2546  const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits();
2547 
2548  if (!FeatureBits[ARM::HasV8_1aOps] ||
2549  !FeatureBits[ARM::HasV8Ops])
2550  return MCDisassembler::Fail;
2551 
2552  // Decoder can be called from DecodeTST, which does not check the full
2553  // encoding is valid.
2554  if (fieldFromInstruction(Insn, 20,12) != 0xf11 ||
2555  fieldFromInstruction(Insn, 4,4) != 0)
2556  return MCDisassembler::Fail;
2557  if (fieldFromInstruction(Insn, 10,10) != 0 ||
2558  fieldFromInstruction(Insn, 0,4) != 0)
2559  S = MCDisassembler::SoftFail;
2560 
2561  Inst.setOpcode(ARM::SETPAN);
2562  Inst.addOperand(MCOperand::createImm(Imm));
2563 
2564  return S;
2565 }
2566 
2567 static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
2568  uint64_t Address, const void *Decoder) {
2569  DecodeStatus S = MCDisassembler::Success;
2570 
2571  unsigned add = fieldFromInstruction(Val, 12, 1);
2572  unsigned imm = fieldFromInstruction(Val, 0, 12);
2573  unsigned Rn = fieldFromInstruction(Val, 13, 4);
2574 
2575  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2576  return MCDisassembler::Fail;
2577 
2578  if (!add) imm *= -1;
2579  if (imm == 0 && !add) imm = INT32_MIN;
2580  Inst.addOperand(MCOperand::createImm(imm));
2581  if (Rn == 15)
2582  tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder);
2583 
2584  return S;
2585 }
2586 
2587 static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
2588  uint64_t Address, const void *Decoder) {
2589  DecodeStatus S = MCDisassembler::Success;
2590 
2591  unsigned Rn = fieldFromInstruction(Val, 9, 4);
2592  // U == 1 to add imm, 0 to subtract it.
2593  unsigned U = fieldFromInstruction(Val, 8, 1);
2594  unsigned imm = fieldFromInstruction(Val, 0, 8);
2595 
2596  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2597  return MCDisassembler::Fail;
2598 
2599  if (U)
2600  Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::add, imm)));
2601  else
2602  Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm)));
2603 
2604  return S;
2605 }
2606 
2607 static DecodeStatus DecodeAddrMode5FP16Operand(MCInst &Inst, unsigned Val,
2608  uint64_t Address, const void *Decoder) {
2609  DecodeStatus S = MCDisassembler::Success;
2610 
2611  unsigned Rn = fieldFromInstruction(Val, 9, 4);
2612  // U == 1 to add imm, 0 to subtract it.
2613  unsigned U = fieldFromInstruction(Val, 8, 1);
2614  unsigned imm = fieldFromInstruction(Val, 0, 8);
2615 
2616  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2617  return MCDisassembler::Fail;
2618 
2619  if (U)
2620  Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::add, imm)));
2621  else
2622  Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::sub, imm)));
2623 
2624  return S;
2625 }
2626 
2627 static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
2628  uint64_t Address, const void *Decoder) {
2629  return DecodeGPRRegisterClass(Inst, Val, Address, Decoder);
2630 }
2631 
2632 static DecodeStatus
2633 DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
2634  uint64_t Address, const void *Decoder) {
2635  DecodeStatus Status = MCDisassembler::Success;
2636 
2637  // Note the J1 and J2 values are from the encoded instruction. So here
2638  // change them to I1 and I2 values via as documented:
2639  // I1 = NOT(J1 EOR S);
2640  // I2 = NOT(J2 EOR S);
2641  // and build the imm32 with one trailing zero as documented:
2642  // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
2643  unsigned S = fieldFromInstruction(Insn, 26, 1);
2644  unsigned J1 = fieldFromInstruction(Insn, 13, 1);
2645  unsigned J2 = fieldFromInstruction(Insn, 11, 1);
2646  unsigned I1 = !(J1 ^ S);
2647  unsigned I2 = !(J2 ^ S);
2648  unsigned imm10 = fieldFromInstruction(Insn, 16, 10);
2649  unsigned imm11 = fieldFromInstruction(Insn, 0, 11);
2650  unsigned tmp = (S << 23) | (I1 << 22) | (I2 << 21) | (imm10 << 11) | imm11;
2651  int imm32 = SignExtend32<25>(tmp << 1);
2652  if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
2653  true, 4, Inst, Decoder))
2654  Inst.addOperand(MCOperand::createImm(imm32));
2655 
2656  return Status;
2657 }
2658 
2659 static DecodeStatus
2660 DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn,
2661  uint64_t Address, const void *Decoder) {
2662  DecodeStatus S = MCDisassembler::Success;
2663 
2664  unsigned pred = fieldFromInstruction(Insn, 28, 4);
2665  unsigned imm = fieldFromInstruction(Insn, 0, 24) << 2;
2666 
2667  if (pred == 0xF) {
2668  Inst.setOpcode(ARM::BLXi);
2669  imm |= fieldFromInstruction(Insn, 24, 1) << 1;
2670  if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2671  true, 4, Inst, Decoder))
2672  Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm)));
2673  return S;
2674  }
2675 
2676  if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2677  true, 4, Inst, Decoder))
2678  Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm)));
2679 
2680  // We already have BL_pred for BL w/ predicate, no need to add addition
2681  // predicate opreands for BL
2682  if (Inst.getOpcode() != ARM::BL)
2683  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2684  return MCDisassembler::Fail;
2685 
2686  return S;
2687 }
2688 
2689 static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
2690  uint64_t Address, const void *Decoder) {
2691  DecodeStatus S = MCDisassembler::Success;
2692 
2693  unsigned Rm = fieldFromInstruction(Val, 0, 4);
2694  unsigned align = fieldFromInstruction(Val, 4, 2);
2695 
2696  if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2697  return MCDisassembler::Fail;
2698  if (!align)
2699  Inst.addOperand(MCOperand::createImm(0));
2700  else
2701  Inst.addOperand(MCOperand::createImm(4 << align));
2702 
2703  return S;
2704 }
2705 
2706 static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Insn,
2707  uint64_t Address, const void *Decoder) {
2708  DecodeStatus S = MCDisassembler::Success;
2709 
2710  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2711  Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2712  unsigned wb = fieldFromInstruction(Insn, 16, 4);
2713  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2714  Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
2715  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2716 
2717  // First output register
2718  switch (Inst.getOpcode()) {
2719  case ARM::VLD1q16: case ARM::VLD1q32: case ARM::VLD1q64: case ARM::VLD1q8:
2720  case ARM::VLD1q16wb_fixed: case ARM::VLD1q16wb_register:
2721  case ARM::VLD1q32wb_fixed: case ARM::VLD1q32wb_register:
2722  case ARM::VLD1q64wb_fixed: case ARM::VLD1q64wb_register:
2723  case ARM::VLD1q8wb_fixed: case ARM::VLD1q8wb_register:
2724  case ARM::VLD2d16: case ARM::VLD2d32: case ARM::VLD2d8:
2725  case ARM::VLD2d16wb_fixed: case ARM::VLD2d16wb_register:
2726  case ARM::VLD2d32wb_fixed: case ARM::VLD2d32wb_register:
2727  case ARM::VLD2d8wb_fixed: case ARM::VLD2d8wb_register:
2728  if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2729  return MCDisassembler::Fail;
2730  break;
2731  case ARM::VLD2b16:
2732  case ARM::VLD2b32:
2733  case ARM::VLD2b8:
2734  case ARM::VLD2b16wb_fixed:
2735  case ARM::VLD2b16wb_register:
2736  case ARM::VLD2b32wb_fixed:
2737  case ARM::VLD2b32wb_register:
2738  case ARM::VLD2b8wb_fixed:
2739  case ARM::VLD2b8wb_register:
2740  if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2741  return MCDisassembler::Fail;
2742  break;
2743  default:
2744  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2745  return MCDisassembler::Fail;
2746  }
2747 
2748  // Second output register
2749  switch (Inst.getOpcode()) {
2750  case ARM::VLD3d8:
2751  case ARM::VLD3d16:
2752  case ARM::VLD3d32:
2753  case ARM::VLD3d8_UPD:
2754  case ARM::VLD3d16_UPD:
2755  case ARM::VLD3d32_UPD:
2756  case ARM::VLD4d8:
2757  case ARM::VLD4d16:
2758  case ARM::VLD4d32:
2759  case ARM::VLD4d8_UPD:
2760  case ARM::VLD4d16_UPD:
2761  case ARM::VLD4d32_UPD:
2762  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
2763  return MCDisassembler::Fail;
2764  break;
2765  case ARM::VLD3q8:
2766  case ARM::VLD3q16:
2767  case ARM::VLD3q32:
2768  case ARM::VLD3q8_UPD:
2769  case ARM::VLD3q16_UPD:
2770  case ARM::VLD3q32_UPD:
2771  case ARM::VLD4q8:
2772  case ARM::VLD4q16:
2773  case ARM::VLD4q32:
2774  case ARM::VLD4q8_UPD:
2775  case ARM::VLD4q16_UPD:
2776  case ARM::VLD4q32_UPD:
2777  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2778  return MCDisassembler::Fail;
2779  break;
2780  default:
2781  break;
2782  }
2783 
2784  // Third output register
2785  switch(Inst.getOpcode()) {
2786  case ARM::VLD3d8:
2787  case ARM::VLD3d16:
2788  case ARM::VLD3d32:
2789  case ARM::VLD3d8_UPD:
2790  case ARM::VLD3d16_UPD:
2791  case ARM::VLD3d32_UPD:
2792  case ARM::VLD4d8:
2793  case ARM::VLD4d16:
2794  case ARM::VLD4d32:
2795  case ARM::VLD4d8_UPD:
2796  case ARM::VLD4d16_UPD:
2797  case ARM::VLD4d32_UPD:
2798  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2799  return MCDisassembler::Fail;
2800  break;
2801  case ARM::VLD3q8:
2802  case ARM::VLD3q16:
2803  case ARM::VLD3q32:
2804  case ARM::VLD3q8_UPD:
2805  case ARM::VLD3q16_UPD:
2806  case ARM::VLD3q32_UPD:
2807  case ARM::VLD4q8:
2808  case ARM::VLD4q16:
2809  case ARM::VLD4q32:
2810  case ARM::VLD4q8_UPD:
2811  case ARM::VLD4q16_UPD:
2812  case ARM::VLD4q32_UPD:
2813  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
2814  return MCDisassembler::Fail;
2815  break;
2816  default:
2817  break;
2818  }
2819 
2820  // Fourth output register
2821  switch (Inst.getOpcode()) {
2822  case ARM::VLD4d8:
2823  case ARM::VLD4d16:
2824  case ARM::VLD4d32:
2825  case ARM::VLD4d8_UPD:
2826  case ARM::VLD4d16_UPD:
2827  case ARM::VLD4d32_UPD:
2828  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
2829  return MCDisassembler::Fail;
2830  break;
2831  case ARM::VLD4q8:
2832  case ARM::VLD4q16:
2833  case ARM::VLD4q32:
2834  case ARM::VLD4q8_UPD:
2835  case ARM::VLD4q16_UPD:
2836  case ARM::VLD4q32_UPD:
2837  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
2838  return MCDisassembler::Fail;
2839  break;
2840  default:
2841  break;
2842  }
2843 
2844  // Writeback operand
2845  switch (Inst.getOpcode()) {
2846  case ARM::VLD1d8wb_fixed:
2847  case ARM::VLD1d16wb_fixed:
2848  case ARM::VLD1d32wb_fixed:
2849  case ARM::VLD1d64wb_fixed:
2850  case ARM::VLD1d8wb_register:
2851  case ARM::VLD1d16wb_register:
2852  case ARM::VLD1d32wb_register:
2853  case ARM::VLD1d64wb_register:
2854  case ARM::VLD1q8wb_fixed:
2855  case ARM::VLD1q16wb_fixed:
2856  case ARM::VLD1q32wb_fixed:
2857  case ARM::VLD1q64wb_fixed:
2858  case ARM::VLD1q8wb_register:
2859  case ARM::VLD1q16wb_register:
2860  case ARM::VLD1q32wb_register:
2861  case ARM::VLD1q64wb_register:
2862  case ARM::VLD1d8Twb_fixed:
2863  case ARM::VLD1d8Twb_register:
2864  case ARM::VLD1d16Twb_fixed:
2865  case ARM::VLD1d16Twb_register:
2866  case ARM::VLD1d32Twb_fixed:
2867  case ARM::VLD1d32Twb_register:
2868  case ARM::VLD1d64Twb_fixed:
2869  case ARM::VLD1d64Twb_register:
2870  case ARM::VLD1d8Qwb_fixed:
2871  case ARM::VLD1d8Qwb_register:
2872  case ARM::VLD1d16Qwb_fixed:
2873  case ARM::VLD1d16Qwb_register:
2874  case ARM::VLD1d32Qwb_fixed:
2875  case ARM::VLD1d32Qwb_register:
2876  case ARM::VLD1d64Qwb_fixed:
2877  case ARM::VLD1d64Qwb_register:
2878  case ARM::VLD2d8wb_fixed:
2879  case ARM::VLD2d16wb_fixed:
2880  case ARM::VLD2d32wb_fixed:
2881  case ARM::VLD2q8wb_fixed:
2882  case ARM::VLD2q16wb_fixed:
2883  case ARM::VLD2q32wb_fixed:
2884  case ARM::VLD2d8wb_register:
2885  case ARM::VLD2d16wb_register:
2886  case ARM::VLD2d32wb_register:
2887  case ARM::VLD2q8wb_register:
2888  case ARM::VLD2q16wb_register:
2889  case ARM::VLD2q32wb_register:
2890  case ARM::VLD2b8wb_fixed:
2891  case ARM::VLD2b16wb_fixed:
2892  case ARM::VLD2b32wb_fixed:
2893  case ARM::VLD2b8wb_register:
2894  case ARM::VLD2b16wb_register:
2895  case ARM::VLD2b32wb_register:
2896  Inst.addOperand(MCOperand::createImm(0));
2897  break;
2898  case ARM::VLD3d8_UPD:
2899  case ARM::VLD3d16_UPD:
2900  case ARM::VLD3d32_UPD:
2901  case ARM::VLD3q8_UPD:
2902  case ARM::VLD3q16_UPD:
2903  case ARM::VLD3q32_UPD:
2904  case ARM::VLD4d8_UPD:
2905  case ARM::VLD4d16_UPD:
2906  case ARM::VLD4d32_UPD:
2907  case ARM::VLD4q8_UPD:
2908  case ARM::VLD4q16_UPD:
2909  case ARM::VLD4q32_UPD:
2910  if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
2911  return MCDisassembler::Fail;
2912  break;
2913  default:
2914  break;
2915  }
2916 
2917  // AddrMode6 Base (register+alignment)
2918  if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
2919  return MCDisassembler::Fail;
2920 
2921  // AddrMode6 Offset (register)
2922  switch (Inst.getOpcode()) {
2923  default:
2924  // The below have been updated to have explicit am6offset split
2925  // between fixed and register offset. For those instructions not
2926  // yet updated, we need to add an additional reg0 operand for the
2927  // fixed variant.
2928  //
2929  // The fixed offset encodes as Rm == 0xd, so we check for that.
2930  if (Rm == 0xd) {
2931  Inst.addOperand(MCOperand::createReg(0));
2932  break;
2933  }
2934  // Fall through to handle the register offset variant.
2935  LLVM_FALLTHROUGH;
2936  case ARM::VLD1d8wb_fixed:
2937  case ARM::VLD1d16wb_fixed:
2938  case ARM::VLD1d32wb_fixed:
2939  case ARM::VLD1d64wb_fixed:
2940  case ARM::VLD1d8Twb_fixed:
2941  case ARM::VLD1d16Twb_fixed:
2942  case ARM::VLD1d32Twb_fixed:
2943  case ARM::VLD1d64Twb_fixed:
2944  case ARM::VLD1d8Qwb_fixed:
2945  case ARM::VLD1d16Qwb_fixed:
2946  case ARM::VLD1d32Qwb_fixed:
2947  case ARM::VLD1d64Qwb_fixed:
2948  case ARM::VLD1d8wb_register:
2949  case ARM::VLD1d16wb_register:
2950  case ARM::VLD1d32wb_register:
2951  case ARM::VLD1d64wb_register:
2952  case ARM::VLD1q8wb_fixed:
2953  case ARM::VLD1q16wb_fixed:
2954  case ARM::VLD1q32wb_fixed:
2955  case ARM::VLD1q64wb_fixed:
2956  case ARM::VLD1q8wb_register:
2957  case ARM::VLD1q16wb_register:
2958  case ARM::VLD1q32wb_register:
2959  case ARM::VLD1q64wb_register:
2960  // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
2961  // variant encodes Rm == 0xf. Anything else is a register offset post-
2962  // increment and we need to add the register operand to the instruction.
2963  if (Rm != 0xD && Rm != 0xF &&
2964  !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2965  return MCDisassembler::Fail;
2966  break;
2967  case ARM::VLD2d8wb_fixed:
2968  case ARM::VLD2d16wb_fixed:
2969  case ARM::VLD2d32wb_fixed:
2970  case ARM::VLD2b8wb_fixed:
2971  case ARM::VLD2b16wb_fixed:
2972  case ARM::VLD2b32wb_fixed:
2973  case ARM::VLD2q8wb_fixed:
2974  case ARM::VLD2q16wb_fixed:
2975  case ARM::VLD2q32wb_fixed:
2976  break;
2977  }
2978 
2979  return S;
2980 }
2981 
2982 static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Insn,
2983  uint64_t Address, const void *Decoder) {
2984  unsigned type = fieldFromInstruction(Insn, 8, 4);
2985  unsigned align = fieldFromInstruction(Insn, 4, 2);
2986  if (type == 6 && (align & 2)) return MCDisassembler::Fail;
2987  if (type == 7 && (align & 2)) return MCDisassembler::Fail;
2988  if (type == 10 && align == 3) return MCDisassembler::Fail;
2989 
2990  unsigned load = fieldFromInstruction(Insn, 21, 1);
2991  return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
2992  : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
2993 }
2994 
2995 static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Insn,
2996  uint64_t Address, const void *Decoder) {
2997  unsigned size = fieldFromInstruction(Insn, 6, 2);
2998  if (size == 3) return MCDisassembler::Fail;
2999 
3000  unsigned type = fieldFromInstruction(Insn, 8, 4);
3001  unsigned align = fieldFromInstruction(Insn, 4, 2);
3002  if (type == 8 && align == 3) return MCDisassembler::Fail;
3003  if (type == 9 && align == 3) return MCDisassembler::Fail;
3004 
3005  unsigned load = fieldFromInstruction(Insn, 21, 1);
3006  return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3007  : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3008 }
3009 
3010 static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Insn,
3011  uint64_t Address, const void *Decoder) {
3012  unsigned size = fieldFromInstruction(Insn, 6, 2);
3013  if (size == 3) return MCDisassembler::Fail;
3014 
3015  unsigned align = fieldFromInstruction(Insn, 4, 2);
3016  if (align & 2) return MCDisassembler::Fail;
3017 
3018  unsigned load = fieldFromInstruction(Insn, 21, 1);
3019  return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3020  : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3021 }
3022 
3023 static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Insn,
3024  uint64_t Address, const void *Decoder) {
3025  unsigned size = fieldFromInstruction(Insn, 6, 2);
3026  if (size == 3) return MCDisassembler::Fail;
3027 
3028  unsigned load = fieldFromInstruction(Insn, 21, 1);
3029  return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3030  : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3031 }
3032 
3033 static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Insn,
3034  uint64_t Address, const void *Decoder) {
3035  DecodeStatus S = MCDisassembler::Success;
3036 
3037  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3038  Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3039  unsigned wb = fieldFromInstruction(Insn, 16, 4);
3040  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3041  Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
3042  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3043 
3044  // Writeback Operand
3045  switch (Inst.getOpcode()) {
3046  case ARM::VST1d8wb_fixed:
3047  case ARM::VST1d16wb_fixed:
3048  case ARM::VST1d32wb_fixed:
3049  case ARM::VST1d64wb_fixed:
3050  case ARM::VST1d8wb_register:
3051  case ARM::VST1d16wb_register:
3052  case ARM::VST1d32wb_register:
3053  case ARM::VST1d64wb_register:
3054  case ARM::VST1q8wb_fixed:
3055  case ARM::VST1q16wb_fixed:
3056  case ARM::VST1q32wb_fixed:
3057  case ARM::VST1q64wb_fixed:
3058  case ARM::VST1q8wb_register:
3059  case ARM::VST1q16wb_register:
3060  case ARM::VST1q32wb_register:
3061  case ARM::VST1q64wb_register:
3062  case ARM::VST1d8Twb_fixed:
3063  case ARM::VST1d16Twb_fixed:
3064  case ARM::VST1d32Twb_fixed:
3065  case ARM::VST1d64Twb_fixed:
3066  case ARM::VST1d8Twb_register:
3067  case ARM::VST1d16Twb_register:
3068  case ARM::VST1d32Twb_register:
3069  case ARM::VST1d64Twb_register:
3070  case ARM::VST1d8Qwb_fixed:
3071  case ARM::VST1d16Qwb_fixed:
3072  case ARM::VST1d32Qwb_fixed:
3073  case ARM::VST1d64Qwb_fixed:
3074  case ARM::VST1d8Qwb_register:
3075  case ARM::VST1d16Qwb_register:
3076  case ARM::VST1d32Qwb_register:
3077  case ARM::VST1d64Qwb_register:
3078  case ARM::VST2d8wb_fixed:
3079  case ARM::VST2d16wb_fixed:
3080  case ARM::VST2d32wb_fixed:
3081  case ARM::VST2d8wb_register:
3082  case ARM::VST2d16wb_register:
3083  case ARM::VST2d32wb_register:
3084  case ARM::VST2q8wb_fixed:
3085  case ARM::VST2q16wb_fixed:
3086  case ARM::VST2q32wb_fixed:
3087  case ARM::VST2q8wb_register:
3088  case ARM::VST2q16wb_register:
3089  case ARM::VST2q32wb_register:
3090  case ARM::VST2b8wb_fixed:
3091  case ARM::VST2b16wb_fixed:
3092  case ARM::VST2b32wb_fixed:
3093  case ARM::VST2b8wb_register:
3094  case ARM::VST2b16wb_register:
3095  case ARM::VST2b32wb_register:
3096  if (Rm == 0xF)
3097  return MCDisassembler::Fail;
3098  Inst.addOperand(MCOperand::createImm(0));
3099  break;
3100  case ARM::VST3d8_UPD:
3101  case ARM::VST3d16_UPD:
3102  case ARM::VST3d32_UPD:
3103  case ARM::VST3q8_UPD:
3104  case ARM::VST3q16_UPD:
3105  case ARM::VST3q32_UPD:
3106  case ARM::VST4d8_UPD:
3107  case ARM::VST4d16_UPD:
3108  case ARM::VST4d32_UPD:
3109  case ARM::VST4q8_UPD:
3110  case ARM::VST4q16_UPD:
3111  case ARM::VST4q32_UPD:
3112  if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
3113  return MCDisassembler::Fail;
3114  break;
3115  default:
3116  break;
3117  }
3118 
3119  // AddrMode6 Base (register+alignment)
3120  if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
3121  return MCDisassembler::Fail;
3122 
3123  // AddrMode6 Offset (register)
3124  switch (Inst.getOpcode()) {
3125  default:
3126  if (Rm == 0xD)
3127  Inst.addOperand(MCOperand::createReg(0));
3128  else if (Rm != 0xF) {
3129  if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3130  return MCDisassembler::Fail;
3131  }
3132  break;
3133  case ARM::VST1d8wb_fixed:
3134  case ARM::VST1d16wb_fixed:
3135  case ARM::VST1d32wb_fixed:
3136  case ARM::VST1d64wb_fixed:
3137  case ARM::VST1q8wb_fixed:
3138  case ARM::VST1q16wb_fixed:
3139  case ARM::VST1q32wb_fixed:
3140  case ARM::VST1q64wb_fixed:
3141  case ARM::VST1d8Twb_fixed:
3142  case ARM::VST1d16Twb_fixed:
3143  case ARM::VST1d32Twb_fixed:
3144  case ARM::VST1d64Twb_fixed:
3145  case ARM::VST1d8Qwb_fixed:
3146  case ARM::VST1d16Qwb_fixed:
3147  case ARM::VST1d32Qwb_fixed:
3148  case ARM::VST1d64Qwb_fixed:
3149  case ARM::VST2d8wb_fixed:
3150  case ARM::VST2d16wb_fixed:
3151  case ARM::VST2d32wb_fixed:
3152  case ARM::VST2q8wb_fixed:
3153  case ARM::VST2q16wb_fixed:
3154  case ARM::VST2q32wb_fixed:
3155  case ARM::VST2b8wb_fixed:
3156  case ARM::VST2b16wb_fixed:
3157  case ARM::VST2b32wb_fixed:
3158  break;
3159  }
3160 
3161  // First input register
3162  switch (Inst.getOpcode()) {
3163  case ARM::VST1q16:
3164  case ARM::VST1q32:
3165  case ARM::VST1q64:
3166  case ARM::VST1q8:
3167  case ARM::VST1q16wb_fixed:
3168  case ARM::VST1q16wb_register:
3169  case ARM::VST1q32wb_fixed:
3170  case ARM::VST1q32wb_register:
3171  case ARM::VST1q64wb_fixed:
3172  case ARM::VST1q64wb_register:
3173  case ARM::VST1q8wb_fixed:
3174  case ARM::VST1q8wb_register:
3175  case ARM::VST2d16:
3176  case ARM::VST2d32:
3177  case ARM::VST2d8:
3178  case ARM::VST2d16wb_fixed:
3179  case ARM::VST2d16wb_register:
3180  case ARM::VST2d32wb_fixed:
3181  case ARM::VST2d32wb_register:
3182  case ARM::VST2d8wb_fixed:
3183  case ARM::VST2d8wb_register:
3184  if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3185  return MCDisassembler::Fail;
3186  break;
3187  case ARM::VST2b16:
3188  case ARM::VST2b32:
3189  case ARM::VST2b8:
3190  case ARM::VST2b16wb_fixed:
3191  case ARM::VST2b16wb_register:
3192  case ARM::VST2b32wb_fixed:
3193  case ARM::VST2b32wb_register:
3194  case ARM::VST2b8wb_fixed:
3195  case ARM::VST2b8wb_register:
3196  if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
3197  return MCDisassembler::Fail;
3198  break;
3199  default:
3200  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3201  return MCDisassembler::Fail;
3202  }
3203 
3204  // Second input register
3205  switch (Inst.getOpcode()) {
3206  case ARM::VST3d8:
3207  case ARM::VST3d16:
3208  case ARM::VST3d32:
3209  case ARM::VST3d8_UPD:
3210  case ARM::VST3d16_UPD:
3211  case ARM::VST3d32_UPD:
3212  case ARM::VST4d8:
3213  case ARM::VST4d16:
3214  case ARM::VST4d32:
3215  case ARM::VST4d8_UPD:
3216  case ARM::VST4d16_UPD:
3217  case ARM::VST4d32_UPD:
3218  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
3219  return MCDisassembler::Fail;
3220  break;
3221  case ARM::VST3q8:
3222  case ARM::VST3q16:
3223  case ARM::VST3q32:
3224  case ARM::VST3q8_UPD:
3225  case ARM::VST3q16_UPD:
3226  case ARM::VST3q32_UPD:
3227  case ARM::VST4q8:
3228  case ARM::VST4q16:
3229  case ARM::VST4q32:
3230  case ARM::VST4q8_UPD:
3231  case ARM::VST4q16_UPD:
3232  case ARM::VST4q32_UPD:
3233  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3234  return MCDisassembler::Fail;
3235  break;
3236  default:
3237  break;
3238  }
3239 
3240  // Third input register
3241  switch (Inst.getOpcode()) {
3242  case ARM::VST3d8:
3243  case ARM::VST3d16:
3244  case ARM::VST3d32:
3245  case ARM::VST3d8_UPD:
3246  case ARM::VST3d16_UPD:
3247  case ARM::VST3d32_UPD:
3248  case ARM::VST4d8:
3249  case ARM::VST4d16:
3250  case ARM::VST4d32:
3251  case ARM::VST4d8_UPD:
3252  case ARM::VST4d16_UPD:
3253  case ARM::VST4d32_UPD:
3254  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3255  return MCDisassembler::Fail;
3256  break;
3257  case ARM::VST3q8:
3258  case ARM::VST3q16:
3259  case ARM::VST3q32:
3260  case ARM::VST3q8_UPD:
3261  case ARM::VST3q16_UPD:
3262  case ARM::VST3q32_UPD:
3263  case ARM::VST4q8:
3264  case ARM::VST4q16:
3265  case ARM::VST4q32:
3266  case ARM::VST4q8_UPD:
3267  case ARM::VST4q16_UPD:
3268  case ARM::VST4q32_UPD:
3269  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
3270  return MCDisassembler::Fail;
3271  break;
3272  default:
3273  break;
3274  }
3275 
3276  // Fourth input register
3277  switch (Inst.getOpcode()) {
3278  case ARM::VST4d8:
3279  case ARM::VST4d16:
3280  case ARM::VST4d32:
3281  case ARM::VST4d8_UPD:
3282  case ARM::VST4d16_UPD:
3283  case ARM::VST4d32_UPD:
3284  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
3285  return MCDisassembler::Fail;
3286  break;
3287  case ARM::VST4q8:
3288  case ARM::VST4q16:
3289  case ARM::VST4q32:
3290  case ARM::VST4q8_UPD:
3291  case ARM::VST4q16_UPD:
3292  case ARM::VST4q32_UPD:
3293  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
3294  return MCDisassembler::Fail;
3295  break;
3296  default:
3297  break;
3298  }
3299 
3300  return S;
3301 }
3302 
3303 static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Insn,
3304  uint64_t Address, const void *Decoder) {
3305  DecodeStatus S = MCDisassembler::Success;
3306 
3307  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3308  Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3309  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3310  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3311  unsigned align = fieldFromInstruction(Insn, 4, 1);
3312  unsigned size = fieldFromInstruction(Insn, 6, 2);
3313 
3314  if (size == 0 && align == 1)
3315  return MCDisassembler::Fail;
3316  align *= (1 << size);
3317 
3318  switch (Inst.getOpcode()) {
3319  case ARM::VLD1DUPq16: case ARM::VLD1DUPq32: case ARM::VLD1DUPq8:
3320  case ARM::VLD1DUPq16wb_fixed: case ARM::VLD1DUPq16wb_register:
3321  case ARM::VLD1DUPq32wb_fixed: case ARM::VLD1DUPq32wb_register:
3322  case ARM::VLD1DUPq8wb_fixed: case ARM::VLD1DUPq8wb_register:
3323  if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3324  return MCDisassembler::Fail;
3325  break;
3326  default:
3327  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3328  return MCDisassembler::Fail;
3329  break;
3330  }
3331  if (Rm != 0xF) {
3332  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3333  return MCDisassembler::Fail;
3334  }
3335 
3336  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3337  return MCDisassembler::Fail;
3338  Inst.addOperand(MCOperand::createImm(align));
3339 
3340  // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
3341  // variant encodes Rm == 0xf. Anything else is a register offset post-
3342  // increment and we need to add the register operand to the instruction.
3343  if (Rm != 0xD && Rm != 0xF &&
3344  !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3345  return MCDisassembler::Fail;
3346 
3347  return S;
3348 }
3349 
3350 static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Insn,
3351  uint64_t Address, const void *Decoder) {
3352  DecodeStatus S = MCDisassembler::Success;
3353 
3354  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3355  Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3356  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3357  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3358  unsigned align = fieldFromInstruction(Insn, 4, 1);
3359  unsigned size = 1 << fieldFromInstruction(Insn, 6, 2);
3360  align *= 2*size;
3361 
3362  switch (Inst.getOpcode()) {
3363  case ARM::VLD2DUPd16: case ARM::VLD2DUPd32: case ARM::VLD2DUPd8:
3364  case ARM::VLD2DUPd16wb_fixed: case ARM::VLD2DUPd16wb_register:
3365  case ARM::VLD2DUPd32wb_fixed: case ARM::VLD2DUPd32wb_register:
3366  case ARM::VLD2DUPd8wb_fixed: case ARM::VLD2DUPd8wb_register:
3367  if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3368  return MCDisassembler::Fail;
3369  break;
3370  case ARM::VLD2DUPd16x2: case ARM::VLD2DUPd32x2: case ARM::VLD2DUPd8x2:
3371  case ARM::VLD2DUPd16x2wb_fixed: case ARM::VLD2DUPd16x2wb_register:
3372  case ARM::VLD2DUPd32x2wb_fixed: case ARM::VLD2DUPd32x2wb_register:
3373  case ARM::VLD2DUPd8x2wb_fixed: case ARM::VLD2DUPd8x2wb_register:
3374  if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
3375  return MCDisassembler::Fail;
3376  break;
3377  default:
3378  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3379  return MCDisassembler::Fail;
3380  break;
3381  }
3382 
3383  if (Rm != 0xF)
3384  Inst.addOperand(MCOperand::createImm(0));
3385 
3386  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3387  return MCDisassembler::Fail;
3388  Inst.addOperand(MCOperand::createImm(align));
3389 
3390  if (Rm != 0xD && Rm != 0xF) {
3391  if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3392  return MCDisassembler::Fail;
3393  }
3394 
3395  return S;
3396 }
3397 
3398 static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Insn,
3399  uint64_t Address, const void *Decoder) {
3400  DecodeStatus S = MCDisassembler::Success;
3401 
3402  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3403  Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3404  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3405  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3406  unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
3407 
3408  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3409  return MCDisassembler::Fail;
3410  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
3411  return MCDisassembler::Fail;
3412  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
3413  return MCDisassembler::Fail;
3414  if (Rm != 0xF) {
3415  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3416  return MCDisassembler::Fail;
3417  }
3418 
3419  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3420  return MCDisassembler::Fail;
3421  Inst.addOperand(MCOperand::createImm(0));
3422 
3423  if (Rm == 0xD)
3424  Inst.addOperand(MCOperand::createReg(0));
3425  else if (Rm != 0xF) {
3426  if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3427  return MCDisassembler::Fail;
3428  }
3429 
3430  return S;
3431 }
3432 
3433 static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Insn,
3434  uint64_t Address, const void *Decoder) {
3435  DecodeStatus S = MCDisassembler::Success;
3436 
3437  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3438  Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3439  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3440  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3441  unsigned size = fieldFromInstruction(Insn, 6, 2);
3442  unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
3443  unsigned align = fieldFromInstruction(Insn, 4, 1);
3444 
3445  if (size == 0x3) {
3446  if (align == 0)
3447  return MCDisassembler::Fail;
3448  align = 16;
3449  } else {
3450  if (size == 2) {
3451  align *= 8;
3452  } else {
3453  size = 1 << size;
3454  align *= 4*size;
3455  }
3456  }
3457 
3458  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3459  return MCDisassembler::Fail;
3460  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
3461  return MCDisassembler::Fail;
3462  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
3463  return MCDisassembler::Fail;
3464  if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder)))
3465  return MCDisassembler::Fail;
3466  if (Rm != 0xF) {
3467  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3468  return MCDisassembler::Fail;
3469  }
3470 
3471  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3472  return MCDisassembler::Fail;
3473  Inst.addOperand(MCOperand::createImm(align));
3474 
3475  if (Rm == 0xD)
3476  Inst.addOperand(MCOperand::createReg(0));
3477  else if (Rm != 0xF) {
3478  if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3479  return MCDisassembler::Fail;
3480  }
3481 
3482  return S;
3483 }
3484 
3485 static DecodeStatus
3486 DecodeVMOVModImmInstruction(MCInst &Inst, unsigned Insn,
3487  uint64_t Address, const void *Decoder) {
3488  DecodeStatus S = MCDisassembler::Success;
3489 
3490  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3491  Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3492  unsigned imm = fieldFromInstruction(Insn, 0, 4);
3493  imm |= fieldFromInstruction(Insn, 16, 3) << 4;
3494  imm |= fieldFromInstruction(Insn, 24, 1) << 7;
3495  imm |= fieldFromInstruction(Insn, 8, 4) << 8;
3496  imm |= fieldFromInstruction(Insn, 5, 1) << 12;
3497  unsigned Q = fieldFromInstruction(Insn, 6, 1);
3498 
3499  if (Q) {
3500  if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3501  return MCDisassembler::Fail;
3502  } else {
3503  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3504  return MCDisassembler::Fail;
3505  }
3506 
3507  Inst.addOperand(MCOperand::createImm(imm));
3508 
3509  switch (Inst.getOpcode()) {
3510  case ARM::VORRiv4i16:
3511  case ARM::VORRiv2i32:
3512  case ARM::VBICiv4i16:
3513  case ARM::VBICiv2i32:
3514  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3515  return MCDisassembler::Fail;
3516  break;
3517  case ARM::VORRiv8i16:
3518  case ARM::VORRiv4i32:
3519  case ARM::VBICiv8i16:
3520  case ARM::VBICiv4i32:
3521  if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3522  return MCDisassembler::Fail;
3523  break;
3524  default:
3525  break;
3526  }
3527 
3528  return S;
3529 }
3530 
3531 static DecodeStatus
3532 DecodeMVEModImmInstruction(MCInst &Inst, unsigned Insn,
3533  uint64_t Address, const void *Decoder) {
3534  DecodeStatus S = MCDisassembler::Success;
3535 
3536  unsigned Qd = ((fieldFromInstruction(Insn, 22, 1) << 3) |
3537  fieldFromInstruction(Insn, 13, 3));
3538  unsigned cmode = fieldFromInstruction(Insn, 8, 4);
3539  unsigned imm = fieldFromInstruction(Insn, 0, 4);
3540  imm |= fieldFromInstruction(Insn, 16, 3) << 4;
3541  imm |= fieldFromInstruction(Insn, 28, 1) << 7;
3542  imm |= cmode << 8;
3543  imm |= fieldFromInstruction(Insn, 5, 1) << 12;
3544 
3545  if (cmode == 0xF && Inst.getOpcode() == ARM::MVE_VMVNimmi32)
3546  return MCDisassembler::Fail;
3547 
3548  if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
3549  return MCDisassembler::Fail;
3550 
3551  Inst.addOperand(MCOperand::createImm(imm));
3552 
3553  Inst.addOperand(MCOperand::createImm(ARMVCC::None));
3554  Inst.addOperand(MCOperand::createReg(0));
3555  Inst.addOperand(MCOperand::createImm(0));
3556 
3557  return S;
3558 }
3559 
3560 static DecodeStatus DecodeMVEVADCInstruction(MCInst &Inst, unsigned Insn,
3561  uint64_t Address, const void *Decoder) {
3562  DecodeStatus S = MCDisassembler::Success;
3563 
3564  unsigned Qd = fieldFromInstruction(Insn, 13, 3);
3565  Qd |= fieldFromInstruction(Insn, 22, 1) << 3;
3566  if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
3567  return MCDisassembler::Fail;
3568  Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
3569 
3570  unsigned Qn = fieldFromInstruction(Insn, 17, 3);
3571  Qn |= fieldFromInstruction(Insn, 7, 1) << 3;
3572  if (!Check(S, DecodeMQPRRegisterClass(Inst, Qn, Address, Decoder)))
3573  return MCDisassembler::Fail;
3574  unsigned Qm = fieldFromInstruction(Insn, 1, 3);
3575  Qm |= fieldFromInstruction(Insn, 5, 1) << 3;
3576  if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
3577  return MCDisassembler::Fail;
3578  if (!fieldFromInstruction(Insn, 12, 1)) // I bit clear => need input FPSCR
3579  Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
3580  Inst.addOperand(MCOperand::createImm(Qd));
3581 
3582  return S;
3583 }
3584 
3585 static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Insn,
3586  uint64_t Address, const void *Decoder) {
3587  DecodeStatus S = MCDisassembler::Success;
3588 
3589  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3590  Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3591  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3592  Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3593  unsigned size = fieldFromInstruction(Insn, 18, 2);
3594 
3595  if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3596  return MCDisassembler::Fail;
3597  if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3598  return MCDisassembler::Fail;
3599  Inst.addOperand(MCOperand::createImm(8 << size));
3600 
3601  return S;
3602 }
3603 
3604 static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
3605  uint64_t Address, const void *Decoder) {
3606  Inst.addOperand(MCOperand::createImm(8 - Val));
3607  return MCDisassembler::Success;
3608 }
3609 
3610 static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
3611  uint64_t Address, const void *Decoder) {
3612  Inst.addOperand(MCOperand::createImm(16 - Val));
3613  return MCDisassembler::Success;
3614 }
3615 
3616 static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
3617  uint64_t Address, const void *Decoder) {
3618  Inst.addOperand(MCOperand::createImm(32 - Val));
3619  return MCDisassembler::Success;
3620 }
3621 
3622 static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
3623  uint64_t Address, const void *Decoder) {
3624  Inst.addOperand(MCOperand::createImm(64 - Val));
3625  return MCDisassembler::Success;
3626 }
3627 
3628 static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
3629  uint64_t Address, const void *Decoder) {
3630  DecodeStatus S = MCDisassembler::Success;
3631 
3632  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3633  Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3634  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3635  Rn |= fieldFromInstruction(Insn, 7, 1) << 4;
3636  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3637  Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3638  unsigned op = fieldFromInstruction(Insn, 6, 1);
3639 
3640  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3641  return MCDisassembler::Fail;
3642  if (op) {
3643  if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3644  return MCDisassembler::Fail; // Writeback
3645  }
3646 
3647  switch (Inst.getOpcode()) {
3648  case ARM::VTBL2:
3649  case ARM::VTBX2:
3650  if (!Check(S, DecodeDPairRegisterClass(Inst, Rn, Address, Decoder)))
3651  return MCDisassembler::Fail;
3652  break;
3653  default:
3654  if (!Check(S, DecodeDPRRegisterClass(Inst, Rn, Address, Decoder)))
3655  return MCDisassembler::Fail;
3656  }
3657 
3658  if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3659  return MCDisassembler::Fail;
3660 
3661  return S;
3662 }
3663 
3664 static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
3665  uint64_t Address, const void *Decoder) {
3666  DecodeStatus S = MCDisassembler::Success;
3667 
3668  unsigned dst = fieldFromInstruction(Insn, 8, 3);
3669  unsigned imm = fieldFromInstruction(Insn, 0, 8);
3670 
3671  if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder)))
3672  return MCDisassembler::Fail;
3673 
3674  switch(Inst.getOpcode()) {
3675  default:
3676  return MCDisassembler::Fail;
3677  case ARM::tADR:
3678  break; // tADR does not explicitly represent the PC as an operand.
3679  case ARM::tADDrSPi:
3680  Inst.addOperand(MCOperand::createReg(ARM::SP));
3681  break;
3682  }
3683 
3684  Inst.addOperand(MCOperand::createImm(imm));
3685  return S;
3686 }
3687 
3688 static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
3689  uint64_t Address, const void *Decoder) {
3690  if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<12>(Val<<1) + 4,
3691  true, 2, Inst, Decoder))
3692  Inst.addOperand(MCOperand::createImm(SignExtend32<12>(Val << 1)));
3693  return MCDisassembler::Success;
3694 }
3695 
3696 static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
3697  uint64_t Address, const void *Decoder) {
3698  if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<21>(Val) + 4,
3699  true, 4, Inst, Decoder))
3700  Inst.addOperand(MCOperand::createImm(SignExtend32<21>(Val)));
3701  return MCDisassembler::Success;
3702 }
3703 
3704 static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
3705  uint64_t Address, const void *Decoder) {
3706  if (!tryAddingSymbolicOperand(Address, Address + (Val<<1) + 4,
3707  true, 2, Inst, Decoder))
3708  Inst.addOperand(MCOperand::createImm(Val << 1));
3709  return MCDisassembler::Success;
3710 }
3711 
3712 static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
3713  uint64_t Address, const void *Decoder) {
3714  DecodeStatus S = MCDisassembler::Success;
3715 
3716  unsigned Rn = fieldFromInstruction(Val, 0, 3);
3717  unsigned Rm = fieldFromInstruction(Val, 3, 3);
3718 
3719  if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
3720  return MCDisassembler::Fail;
3721  if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder)))
3722  return MCDisassembler::Fail;
3723 
3724  return S;
3725 }
3726 
3727 static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
3728  uint64_t Address, const void *Decoder) {
3729  DecodeStatus S = MCDisassembler::Success;
3730 
3731  unsigned Rn = fieldFromInstruction(Val, 0, 3);
3732  unsigned imm = fieldFromInstruction(Val, 3, 5);
3733 
3734  if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
3735  return MCDisassembler::Fail;
3736  Inst.addOperand(MCOperand::createImm(imm));
3737 
3738  return S;
3739 }
3740 
3741 static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
3742  uint64_t Address, const void *Decoder) {
3743  unsigned imm = Val << 2;
3744 
3745  Inst.addOperand(MCOperand::createImm(imm));
3746  tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder);
3747 
3748  return MCDisassembler::Success;
3749 }
3750 
3751 static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
3752  uint64_t Address, const void *Decoder) {
3753  Inst.addOperand(MCOperand::createReg(ARM::SP));
3754  Inst.addOperand(MCOperand::createImm(Val));
3755 
3756  return MCDisassembler::Success;
3757 }
3758 
3759 static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
3760  uint64_t Address, const void *Decoder) {
3761  DecodeStatus S = MCDisassembler::Success;
3762 
3763  unsigned Rn = fieldFromInstruction(Val, 6, 4);
3764  unsigned Rm = fieldFromInstruction(Val, 2, 4);
3765  unsigned imm = fieldFromInstruction(Val, 0, 2);
3766 
3767  // Thumb stores cannot use PC as dest register.
3768  switch (Inst.getOpcode()) {
3769  case ARM::t2STRHs:
3770  case ARM::t2STRBs:
3771  case ARM::t2STRs:
3772  if (Rn == 15)
3773  return MCDisassembler::Fail;
3774  break;
3775  default:
3776  break;
3777  }
3778 
3779  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3780  return MCDisassembler::Fail;
3781  if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
3782  return MCDisassembler::Fail;
3783  Inst.addOperand(MCOperand::createImm(imm));
3784 
3785  return S;
3786 }
3787 
3788 static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Insn,
3789  uint64_t Address, const void *Decoder) {
3790  DecodeStatus S = MCDisassembler::Success;
3791 
3792  unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3793  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3794 
3795  const FeatureBitset &featureBits =
3796  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
3797 
3798  bool hasMP = featureBits[ARM::FeatureMP];
3799  bool hasV7Ops = featureBits[ARM::HasV7Ops];
3800 
3801  if (Rn == 15) {
3802  switch (Inst.getOpcode()) {
3803  case ARM::t2LDRBs:
3804  Inst.setOpcode(ARM::t2LDRBpci);
3805  break;
3806  case ARM::t2LDRHs:
3807  Inst.setOpcode(ARM::t2LDRHpci);
3808  break;
3809  case ARM::t2LDRSHs:
3810  Inst.setOpcode(ARM::t2LDRSHpci);
3811  break;
3812  case ARM::t2LDRSBs:
3813  Inst.setOpcode(ARM::t2LDRSBpci);
3814  break;
3815  case ARM::t2LDRs:
3816  Inst.setOpcode(ARM::t2LDRpci);
3817  break;
3818  case ARM::t2PLDs:
3819  Inst.setOpcode(ARM::t2PLDpci);
3820  break;
3821  case ARM::t2PLIs:
3822  Inst.setOpcode(ARM::t2PLIpci);
3823  break;
3824  default:
3825  return MCDisassembler::Fail;
3826  }
3827 
3828  return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3829  }
3830 
3831  if (Rt == 15) {
3832  switch (Inst.getOpcode()) {
3833  case ARM::t2LDRSHs:
3834  return MCDisassembler::Fail;
3835  case ARM::t2LDRHs:
3836  Inst.setOpcode(ARM::t2PLDWs);
3837  break;
3838  case ARM::t2LDRSBs:
3839  Inst.setOpcode(ARM::t2PLIs);
3840  break;
3841  default:
3842  break;
3843  }
3844  }
3845 
3846  switch (Inst.getOpcode()) {
3847  case ARM::t2PLDs:
3848  break;
3849  case ARM::t2PLIs:
3850  if (!hasV7Ops)
3851  return MCDisassembler::Fail;
3852  break;
3853  case ARM::t2PLDWs:
3854  if (!hasV7Ops || !hasMP)
3855  return MCDisassembler::Fail;
3856  break;
3857  default:
3858  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3859  return MCDisassembler::Fail;
3860  }
3861 
3862  unsigned addrmode = fieldFromInstruction(Insn, 4, 2);
3863  addrmode |= fieldFromInstruction(Insn, 0, 4) << 2;
3864  addrmode |= fieldFromInstruction(Insn, 16, 4) << 6;
3865  if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder)))
3866  return MCDisassembler::Fail;
3867 
3868  return S;
3869 }
3870 
3871 static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
3872  uint64_t Address, const void* Decoder) {
3873  DecodeStatus S = MCDisassembler::Success;
3874 
3875  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3876  unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3877  unsigned U = fieldFromInstruction(Insn, 9, 1);
3878  unsigned imm = fieldFromInstruction(Insn, 0, 8);
3879  imm |= (U << 8);
3880  imm |= (Rn << 9);
3881  unsigned add = fieldFromInstruction(Insn, 9, 1);
3882 
3883  const FeatureBitset &featureBits =
3884  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
3885 
3886  bool hasMP = featureBits[ARM::FeatureMP];
3887  bool hasV7Ops = featureBits[ARM::HasV7Ops];
3888 
3889  if (Rn == 15) {
3890  switch (Inst.getOpcode()) {
3891  case ARM::t2LDRi8:
3892  Inst.setOpcode(ARM::t2LDRpci);
3893  break;
3894  case ARM::t2LDRBi8:
3895  Inst.setOpcode(ARM::t2LDRBpci);
3896  break;
3897  case ARM::t2LDRSBi8:
3898  Inst.setOpcode(ARM::t2LDRSBpci);
3899  break;
3900  case ARM::t2LDRHi8:
3901  Inst.setOpcode(ARM::t2LDRHpci);
3902  break;
3903  case ARM::t2LDRSHi8:
3904  Inst.setOpcode(ARM::t2LDRSHpci);
3905  break;
3906  case ARM::t2PLDi8:
3907  Inst.setOpcode(ARM::t2PLDpci);
3908  break;
3909  case ARM::t2PLIi8:
3910  Inst.setOpcode(ARM::t2PLIpci);
3911  break;
3912  default:
3913  return MCDisassembler::Fail;
3914  }
3915  return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3916  }
3917 
3918  if (Rt == 15) {
3919  switch (Inst.getOpcode()) {
3920  case ARM::t2LDRSHi8:
3921  return MCDisassembler::Fail;
3922  case ARM::t2LDRHi8:
3923  if (!add)
3924  Inst.setOpcode(ARM::t2PLDWi8);
3925  break;
3926  case ARM::t2LDRSBi8:
3927  Inst.setOpcode(ARM::t2PLIi8);
3928  break;
3929  default:
3930  break;
3931  }
3932  }
3933 
3934  switch (Inst.getOpcode()) {
3935  case ARM::t2PLDi8:
3936  break;
3937  case ARM::t2PLIi8:
3938  if (!hasV7Ops)
3939  return MCDisassembler::Fail;
3940  break;
3941  case ARM::t2PLDWi8:
3942  if (!hasV7Ops || !hasMP)
3943  return MCDisassembler::Fail;
3944  break;
3945  default:
3946  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3947  return MCDisassembler::Fail;
3948  }
3949 
3950  if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
3951  return MCDisassembler::Fail;
3952  return S;
3953 }
3954 
3955 static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
3956  uint64_t Address, const void* Decoder) {
3957  DecodeStatus S = MCDisassembler::Success;
3958 
3959  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3960  unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3961  unsigned imm = fieldFromInstruction(Insn, 0, 12);
3962  imm |= (Rn << 13);
3963 
3964  const FeatureBitset &featureBits =
3965  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
3966 
3967  bool hasMP = featureBits[ARM::FeatureMP];
3968  bool hasV7Ops = featureBits[ARM::HasV7Ops];
3969 
3970  if (Rn == 15) {
3971  switch (Inst.getOpcode()) {
3972  case ARM::t2LDRi12:
3973  Inst.setOpcode(ARM::t2LDRpci);
3974  break;
3975  case ARM::t2LDRHi12:
3976  Inst.setOpcode(ARM::t2LDRHpci);
3977  break;
3978  case ARM::t2LDRSHi12:
3979  Inst.setOpcode(ARM::t2LDRSHpci);
3980  break;
3981  case ARM::t2LDRBi12:
3982  Inst.setOpcode(ARM::t2LDRBpci);
3983  break;
3984  case ARM::t2LDRSBi12:
3985  Inst.setOpcode(ARM::t2LDRSBpci);
3986  break;
3987  case ARM::t2PLDi12:
3988  Inst.setOpcode(ARM::t2PLDpci);
3989  break;
3990  case ARM::t2PLIi12:
3991  Inst.setOpcode(ARM::t2PLIpci);
3992  break;
3993  default:
3994  return MCDisassembler::Fail;
3995  }
3996  return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3997  }
3998 
3999  if (Rt == 15) {
4000  switch (Inst.getOpcode()) {
4001  case ARM::t2LDRSHi12:
4002  return MCDisassembler::Fail;
4003  case ARM::t2LDRHi12:
4004  Inst.setOpcode(ARM::t2PLDWi12);
4005  break;
4006  case ARM::t2LDRSBi12:
4007  Inst.setOpcode(ARM::t2PLIi12);
4008  break;
4009  default:
4010  break;
4011  }
4012  }
4013 
4014  switch (Inst.getOpcode()) {
4015  case ARM::t2PLDi12:
4016  break;
4017  case ARM::t2PLIi12:
4018  if (!hasV7Ops)
4019  return MCDisassembler::Fail;
4020  break;
4021  case ARM::t2PLDWi12:
4022  if (!hasV7Ops || !hasMP)
4023  return MCDisassembler::Fail;
4024  break;
4025  default:
4026  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4027  return MCDisassembler::Fail;
4028  }
4029 
4030  if (!Check(S, DecodeT2AddrModeImm12(Inst, imm, Address, Decoder)))
4031  return MCDisassembler::Fail;
4032  return S;
4033 }
4034 
4035 static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn,
4036  uint64_t Address, const void* Decoder) {
4037  DecodeStatus S = MCDisassembler::Success;
4038 
4039  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4040  unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4041  unsigned imm = fieldFromInstruction(Insn, 0, 8);
4042  imm |= (Rn << 9);
4043 
4044  if (Rn == 15) {
4045  switch (Inst.getOpcode()) {
4046  case ARM::t2LDRT:
4047  Inst.setOpcode(ARM::t2LDRpci);
4048  break;
4049  case ARM::t2LDRBT:
4050  Inst.setOpcode(ARM::t2LDRBpci);
4051  break;
4052  case ARM::t2LDRHT:
4053  Inst.setOpcode(ARM::t2LDRHpci);
4054  break;
4055  case ARM::t2LDRSBT:
4056  Inst.setOpcode(ARM::t2LDRSBpci);
4057  break;
4058  case ARM::t2LDRSHT:
4059  Inst.setOpcode(ARM::t2LDRSHpci);
4060  break;
4061  default:
4062  return MCDisassembler::Fail;
4063  }
4064  return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4065  }
4066 
4067  if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
4068  return MCDisassembler::Fail;
4069  if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
4070  return MCDisassembler::Fail;
4071  return S;
4072 }
4073 
4074 static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
4075  uint64_t Address, const void* Decoder) {
4076  DecodeStatus S = MCDisassembler::Success;
4077 
4078  unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4079  unsigned U = fieldFromInstruction(Insn, 23, 1);
4080  int imm = fieldFromInstruction(Insn, 0, 12);
4081 
4082  const FeatureBitset &featureBits =
4083  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4084 
4085  bool hasV7Ops = featureBits[ARM::HasV7Ops];
4086 
4087  if (Rt == 15) {
4088  switch (Inst.getOpcode()) {
4089  case ARM::t2LDRBpci:
4090  case ARM::t2LDRHpci:
4091  Inst.setOpcode(ARM::t2PLDpci);
4092  break;
4093  case ARM::t2LDRSBpci:
4094  Inst.setOpcode(ARM::t2PLIpci);
4095  break;
4096  case ARM::t2LDRSHpci:
4097  return MCDisassembler::Fail;
4098  default:
4099  break;
4100  }
4101  }
4102 
4103  switch(Inst.getOpcode()) {
4104  case ARM::t2PLDpci:
4105  break;
4106  case ARM::t2PLIpci:
4107  if (!hasV7Ops)
4108  return MCDisassembler::Fail;
4109  break;
4110  default:
4111  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4112  return MCDisassembler::Fail;
4113  }
4114 
4115  if (!U) {
4116  // Special case for #-0.
4117  if (imm == 0)
4118  imm = INT32_MIN;
4119  else
4120  imm = -imm;
4121  }
4122  Inst.addOperand(MCOperand::createImm(imm));
4123 
4124  return S;
4125 }
4126 
4127 static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val,
4128  uint64_t Address, const void *Decoder) {
4129  if (Val == 0)
4130  Inst.addOperand(MCOperand::createImm(INT32_MIN));
4131  else {
4132  int imm = Val & 0xFF;
4133 
4134  if (!(Val & 0x100)) imm *= -1;
4135  Inst.addOperand(MCOperand::createImm(imm * 4));
4136  }
4137 
4138  return MCDisassembler::Success;
4139 }
4140 
4141 static DecodeStatus DecodeT2Imm7S4(MCInst &Inst, unsigned Val, uint64_t Address,
4142  const void *Decoder) {
4143  if (Val == 0)
4144  Inst.addOperand(MCOperand::createImm(INT32_MIN));
4145  else {
4146  int imm = Val & 0x7F;
4147 
4148  if (!(Val & 0x80))
4149  imm *= -1;
4150  Inst.addOperand(MCOperand::createImm(imm * 4));
4151  }
4152 
4153  return MCDisassembler::Success;
4154 }
4155 
4156 static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
4157  uint64_t Address, const void *Decoder) {
4158  DecodeStatus S = MCDisassembler::Success;
4159 
4160  unsigned Rn = fieldFromInstruction(Val, 9, 4);
4161  unsigned imm = fieldFromInstruction(Val, 0, 9);
4162 
4163  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4164  return MCDisassembler::Fail;
4165  if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder)))
4166  return MCDisassembler::Fail;
4167 
4168  return S;
4169 }
4170 
4171 static DecodeStatus DecodeT2AddrModeImm7s4(MCInst &Inst, unsigned Val,
4172  uint64_t Address,
4173  const void *Decoder) {
4174  DecodeStatus S = MCDisassembler::Success;
4175 
4176  unsigned Rn = fieldFromInstruction(Val, 8, 4);
4177  unsigned imm = fieldFromInstruction(Val, 0, 8);
4178 
4179  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4180  return MCDisassembler::Fail;
4181  if (!Check(S, DecodeT2Imm7S4(Inst, imm, Address, Decoder)))
4182  return MCDisassembler::Fail;
4183 
4184  return S;
4185 }
4186 
4187 static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val,
4188  uint64_t Address, const void *Decoder) {
4189  DecodeStatus S = MCDisassembler::Success;
4190 
4191  unsigned Rn = fieldFromInstruction(Val, 8, 4);
4192  unsigned imm = fieldFromInstruction(Val, 0, 8);
4193 
4194  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4195  return MCDisassembler::Fail;
4196 
4197  Inst.addOperand(MCOperand::createImm(imm));
4198 
4199  return S;
4200 }
4201 
4202 static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val,
4203  uint64_t Address, const void *Decoder) {
4204  int imm = Val & 0xFF;
4205  if (Val == 0)
4206  imm = INT32_MIN;
4207  else if (!(Val & 0x100))
4208  imm *= -1;
4209  Inst.addOperand(MCOperand::createImm(imm));
4210 
4211  return MCDisassembler::Success;
4212 }
4213 
4214 template<int shift>
4215 static DecodeStatus DecodeT2Imm7(MCInst &Inst, unsigned Val,
4216  uint64_t Address, const void *Decoder) {
4217  int imm = Val & 0x7F;
4218  if (Val == 0)
4219  imm = INT32_MIN;
4220  else if (!(Val & 0x80))
4221  imm *= -1;
4222  if (imm != INT32_MIN)
4223  imm *= (1U << shift);
4224  Inst.addOperand(MCOperand::createImm(imm));
4225 
4226  return MCDisassembler::Success;
4227 }
4228 
4229 static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
4230  uint64_t Address, const void *Decoder) {
4231  DecodeStatus S = MCDisassembler::Success;
4232 
4233  unsigned Rn = fieldFromInstruction(Val, 9, 4);
4234  unsigned imm = fieldFromInstruction(Val, 0, 9);
4235 
4236  // Thumb stores cannot use PC as dest register.
4237  switch (Inst.getOpcode()) {
4238  case ARM::t2STRT:
4239  case ARM::t2STRBT:
4240  case ARM::t2STRHT:
4241  case ARM::t2STRi8:
4242  case ARM::t2STRHi8:
4243  case ARM::t2STRBi8:
4244  if (Rn == 15)
4245  return MCDisassembler::Fail;
4246  break;
4247  default:
4248  break;
4249  }
4250 
4251  // Some instructions always use an additive offset.
4252  switch (Inst.getOpcode()) {
4253  case ARM::t2LDRT:
4254  case ARM::t2LDRBT:
4255  case ARM::t2LDRHT:
4256  case ARM::t2LDRSBT:
4257  case ARM::t2LDRSHT:
4258  case ARM::t2STRT:
4259  case ARM::t2STRBT:
4260  case ARM::t2STRHT:
4261  imm |= 0x100;
4262  break;
4263  default:
4264  break;
4265  }
4266 
4267  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4268  return MCDisassembler::Fail;
4269  if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder)))
4270  return MCDisassembler::Fail;
4271 
4272  return S;
4273 }
4274 
4275 template<int shift>
4276 static DecodeStatus DecodeTAddrModeImm7(MCInst &Inst, unsigned Val,
4277  uint64_t Address,
4278  const void *Decoder) {
4279  DecodeStatus S = MCDisassembler::Success;
4280 
4281  unsigned Rn = fieldFromInstruction(Val, 8, 3);
4282  unsigned imm = fieldFromInstruction(Val, 0, 8);
4283 
4284  if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
4285  return MCDisassembler::Fail;
4286  if (!Check(S, DecodeT2Imm7<shift>(Inst, imm, Address, Decoder)))
4287  return MCDisassembler::Fail;
4288 
4289  return S;
4290 }
4291 
4292 template<int shift, int WriteBack>
4293 static DecodeStatus DecodeT2AddrModeImm7(MCInst &Inst, unsigned Val,
4294  uint64_t Address,
4295  const void *Decoder) {
4296  DecodeStatus S = MCDisassembler::Success;
4297 
4298  unsigned Rn = fieldFromInstruction(Val, 8, 4);
4299  unsigned imm = fieldFromInstruction(Val, 0, 8);
4300  if (WriteBack) {
4301  if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
4302  return MCDisassembler::Fail;
4303  } else if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4304  return MCDisassembler::Fail;
4305  if (!Check(S, DecodeT2Imm7<shift>(Inst, imm, Address, Decoder)))
4306  return MCDisassembler::Fail;
4307 
4308  return S;
4309 }
4310 
4311 static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Insn,
4312  uint64_t Address, const void *Decoder) {
4313  DecodeStatus S = MCDisassembler::Success;
4314 
4315  unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4316  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4317  unsigned addr = fieldFromInstruction(Insn, 0, 8);
4318  addr |= fieldFromInstruction(Insn, 9, 1) << 8;
4319  addr |= Rn << 9;
4320  unsigned load = fieldFromInstruction(Insn, 20, 1);
4321 
4322  if (Rn == 15) {
4323  switch (Inst.getOpcode()) {
4324  case ARM::t2LDR_PRE:
4325  case ARM::t2LDR_POST:
4326  Inst.setOpcode(ARM::t2LDRpci);
4327  break;
4328  case ARM::t2LDRB_PRE:
4329  case ARM::t2LDRB_POST:
4330  Inst.setOpcode(ARM::t2LDRBpci);
4331  break;
4332  case ARM::t2LDRH_PRE:
4333  case ARM::t2LDRH_POST:
4334  Inst.setOpcode(ARM::t2LDRHpci);
4335  break;
4336  case ARM::t2LDRSB_PRE:
4337  case ARM::t2LDRSB_POST:
4338  if (Rt == 15)
4339  Inst.setOpcode(ARM::t2PLIpci);
4340  else
4341  Inst.setOpcode(ARM::t2LDRSBpci);
4342  break;
4343  case ARM::t2LDRSH_PRE:
4344  case ARM::t2LDRSH_POST:
4345  Inst.setOpcode(ARM::t2LDRSHpci);
4346  break;
4347  default:
4348  return MCDisassembler::Fail;
4349  }
4350  return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4351  }
4352 
4353  if (!load) {
4354  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4355  return MCDisassembler::Fail;
4356  }
4357 
4358  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4359  return MCDisassembler::Fail;
4360 
4361  if (load) {
4362  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4363  return MCDisassembler::Fail;
4364  }
4365 
4366  if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder)))
4367  return MCDisassembler::Fail;
4368 
4369  return S;
4370 }
4371 
4372 static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
4373  uint64_t Address, const void *Decoder) {
4374  DecodeStatus S = MCDisassembler::Success;
4375 
4376  unsigned Rn = fieldFromInstruction(Val, 13, 4);
4377  unsigned imm = fieldFromInstruction(Val, 0, 12);
4378 
4379  // Thumb stores cannot use PC as dest register.
4380  switch (Inst.getOpcode()) {
4381  case ARM::t2STRi12:
4382  case ARM::t2STRBi12:
4383  case ARM::t2STRHi12:
4384  if (Rn == 15)
4385  return MCDisassembler::Fail;
4386  break;
4387  default:
4388  break;
4389  }
4390 
4391  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4392  return MCDisassembler::Fail;
4393  Inst.addOperand(MCOperand::createImm(imm));
4394 
4395  return S;
4396 }
4397 
4398 static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Insn,
4399  uint64_t Address, const void *Decoder) {
4400  unsigned imm = fieldFromInstruction(Insn, 0, 7);
4401 
4402  Inst.addOperand(MCOperand::createReg(ARM::SP));
4403  Inst.addOperand(MCOperand::createReg(ARM::SP));
4404  Inst.addOperand(MCOperand::createImm(imm));
4405 
4406  return MCDisassembler::Success;
4407 }
4408 
4409 static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
4410  uint64_t Address, const void *Decoder) {
4411  DecodeStatus S = MCDisassembler::Success;
4412 
4413  if (Inst.getOpcode() == ARM::tADDrSP) {
4414  unsigned Rdm = fieldFromInstruction(Insn, 0, 3);
4415  Rdm |= fieldFromInstruction(Insn, 7, 1) << 3;
4416 
4417  if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
4418  return MCDisassembler::Fail;
4419  Inst.addOperand(MCOperand::createReg(ARM::SP));
4420  if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
4421  return MCDisassembler::Fail;
4422  } else if (Inst.getOpcode() == ARM::tADDspr) {
4423  unsigned Rm = fieldFromInstruction(Insn, 3, 4);
4424 
4425  Inst.addOperand(MCOperand::createReg(ARM::SP));
4426  Inst.addOperand(MCOperand::createReg(ARM::SP));
4427  if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4428  return MCDisassembler::Fail;
4429  }
4430 
4431  return S;
4432 }
4433 
4434 static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn,
4435  uint64_t Address, const void *Decoder) {
4436  unsigned imod = fieldFromInstruction(Insn, 4, 1) | 0x2;
4437  unsigned flags = fieldFromInstruction(Insn, 0, 3);
4438 
4439  Inst.addOperand(MCOperand::createImm(imod));
4440  Inst.addOperand(MCOperand::createImm(flags));
4441 
4442  return MCDisassembler::Success;
4443 }
4444 
4445 static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn,
4446  uint64_t Address, const void *Decoder) {
4447  DecodeStatus S = MCDisassembler::Success;
4448  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4449  unsigned add = fieldFromInstruction(Insn, 4, 1);
4450 
4451  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
4452  return MCDisassembler::Fail;
4453  Inst.addOperand(MCOperand::createImm(add));
4454 
4455  return S;
4456 }
4457 
4458 static DecodeStatus DecodeMveAddrModeRQ(MCInst &Inst, unsigned Insn,
4459  uint64_t Address, const void *Decoder) {
4460  DecodeStatus S = MCDisassembler::Success;
4461  unsigned Rn = fieldFromInstruction(Insn, 3, 4);
4462  unsigned Qm = fieldFromInstruction(Insn, 0, 3);
4463 
4464  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4465  return MCDisassembler::Fail;
4466  if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
4467  return MCDisassembler::Fail;
4468 
4469  return S;
4470 }
4471 
4472 template<int shift>
4473 static DecodeStatus DecodeMveAddrModeQ(MCInst &Inst, unsigned Insn,
4474  uint64_t Address, const void *Decoder) {
4475  DecodeStatus S = MCDisassembler::Success;
4476  unsigned Qm = fieldFromInstruction(Insn, 8, 3);
4477  int imm = fieldFromInstruction(Insn, 0, 7);
4478 
4479  if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
4480  return MCDisassembler::Fail;
4481 
4482  if(!fieldFromInstruction(Insn, 7, 1)) {
4483  if (imm == 0)
4484  imm = INT32_MIN; // indicate -0
4485  else
4486  imm *= -1;
4487  }
4488  if (imm != INT32_MIN)
4489  imm *= (1U << shift);
4490  Inst.addOperand(MCOperand::createImm(imm));
4491 
4492  return S;
4493 }
4494 
4495 static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Val,
4496  uint64_t Address, const void *Decoder) {
4497  // Val is passed in as S:J1:J2:imm10H:imm10L:'0'
4498  // Note only one trailing zero not two. Also the J1 and J2 values are from
4499  // the encoded instruction. So here change to I1 and I2 values via:
4500  // I1 = NOT(J1 EOR S);
4501  // I2 = NOT(J2 EOR S);
4502  // and build the imm32 with two trailing zeros as documented:
4503  // imm32 = SignExtend(S:I1:I2:imm10H:imm10L:'00', 32);
4504  unsigned S = (Val >> 23) & 1;
4505  unsigned J1 = (Val >> 22) & 1;
4506  unsigned J2 = (Val >> 21) & 1;
4507  unsigned I1 = !(J1 ^ S);
4508  unsigned I2 = !(J2 ^ S);
4509  unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21);
4510  int imm32 = SignExtend32<25>(tmp << 1);
4511 
4512  if (!tryAddingSymbolicOperand(Address,
4513  (Address & ~2u) + imm32 + 4,
4514  true, 4, Inst, Decoder))
4515  Inst.addOperand(MCOperand::createImm(imm32));
4516  return MCDisassembler::Success;
4517 }
4518 
4519 static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Val,
4520  uint64_t Address, const void *Decoder) {
4521  if (Val == 0xA || Val == 0xB)
4522  return MCDisassembler::Fail;
4523 
4524  const FeatureBitset &featureBits =
4525  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4526 
4527  if (!isValidCoprocessorNumber(Val, featureBits))
4528  return MCDisassembler::Fail;
4529 
4530  Inst.addOperand(MCOperand::createImm(Val));
4531  return MCDisassembler::Success;
4532 }
4533 
4534 static DecodeStatus
4535 DecodeThumbTableBranch(MCInst &Inst, unsigned Insn,
4536  uint64_t Address, const void *Decoder) {
4537  const FeatureBitset &FeatureBits =
4538  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4539  DecodeStatus S = MCDisassembler::Success;
4540 
4541  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4542  unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4543 
4544  if (Rn == 13 && !FeatureBits[ARM::HasV8Ops]) S = MCDisassembler::SoftFail;
4545  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4546  return MCDisassembler::Fail;
4547  if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
4548  return MCDisassembler::Fail;
4549  return S;
4550 }
4551 
4552 static DecodeStatus
4553 DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Insn,
4554  uint64_t Address, const void *Decoder) {
4555  DecodeStatus S = MCDisassembler::Success;
4556 
4557  unsigned pred = fieldFromInstruction(Insn, 22, 4);
4558  if (pred == 0xE || pred == 0xF) {
4559  unsigned opc = fieldFromInstruction(Insn, 4, 28);
4560  switch (opc) {
4561  default:
4562  return MCDisassembler::Fail;
4563  case 0xf3bf8f4:
4564  Inst.setOpcode(ARM::t2DSB);
4565  break;
4566  case 0xf3bf8f5:
4567  Inst.setOpcode(ARM::t2DMB);
4568  break;
4569  case 0xf3bf8f6:
4570  Inst.setOpcode(ARM::t2ISB);
4571  break;
4572  }
4573 
4574  unsigned imm = fieldFromInstruction(Insn, 0, 4);
4575  return DecodeMemBarrierOption(Inst, imm, Address, Decoder);
4576  }
4577 
4578  unsigned brtarget = fieldFromInstruction(Insn, 0, 11) << 1;
4579  brtarget |= fieldFromInstruction(Insn, 11, 1) << 19;
4580  brtarget |= fieldFromInstruction(Insn, 13, 1) << 18;
4581  brtarget |= fieldFromInstruction(Insn, 16, 6) << 12;
4582  brtarget |= fieldFromInstruction(Insn, 26, 1) << 20;
4583 
4584  if (!Check(S, DecodeT2BROperand(Inst, brtarget, Address, Decoder)))
4585  return MCDisassembler::Fail;
4586  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4587  return MCDisassembler::Fail;
4588 
4589  return S;
4590 }
4591 
4592 // Decode a shifted immediate operand. These basically consist
4593 // of an 8-bit value, and a 4-bit directive that specifies either
4594 // a splat operation or a rotation.
4595 static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val,
4596  uint64_t Address, const void *Decoder) {
4597  unsigned ctrl = fieldFromInstruction(Val, 10, 2);
4598  if (ctrl == 0) {
4599  unsigned byte = fieldFromInstruction(Val, 8, 2);
4600  unsigned imm = fieldFromInstruction(Val, 0, 8);
4601  switch (byte) {
4602  case 0:
4603  Inst.addOperand(MCOperand::createImm(imm));
4604  break;
4605  case 1:
4606  Inst.addOperand(MCOperand::createImm((imm << 16) | imm));
4607  break;
4608  case 2:
4609  Inst.addOperand(MCOperand::createImm((imm << 24) | (imm << 8)));
4610  break;
4611  case 3:
4612  Inst.addOperand(MCOperand::createImm((imm << 24) | (imm << 16) |
4613  (imm << 8) | imm));
4614  break;
4615  }
4616  } else {
4617  unsigned unrot = fieldFromInstruction(Val, 0, 7) | 0x80;
4618  unsigned rot = fieldFromInstruction(Val, 7, 5);
4619  unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31));
4620  Inst.addOperand(MCOperand::createImm(imm));
4621  }
4622 
4623  return MCDisassembler::Success;
4624 }
4625 
4626 static DecodeStatus
4627 DecodeThumbBCCTargetOperand(MCInst &Inst, unsigned Val,
4628  uint64_t Address, const void *Decoder) {
4629  if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<9>(Val<<1) + 4,
4630  true, 2, Inst, Decoder))
4631  Inst.addOperand(MCOperand::createImm(SignExtend32<9>(Val << 1)));
4632  return MCDisassembler::Success;
4633 }
4634 
4635 static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val,
4636  uint64_t Address,
4637  const void *Decoder) {
4638  // Val is passed in as S:J1:J2:imm10:imm11
4639  // Note no trailing zero after imm11. Also the J1 and J2 values are from
4640  // the encoded instruction. So here change to I1 and I2 values via:
4641  // I1 = NOT(J1 EOR S);
4642  // I2 = NOT(J2 EOR S);
4643  // and build the imm32 with one trailing zero as documented:
4644  // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
4645  unsigned S = (Val >> 23) & 1;
4646  unsigned J1 = (Val >> 22) & 1;
4647  unsigned J2 = (Val >> 21) & 1;
4648  unsigned I1 = !(J1 ^ S);
4649  unsigned I2 = !(J2 ^ S);
4650  unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21);
4651  int imm32 = SignExtend32<25>(tmp << 1);
4652 
4653  if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
4654  true, 4, Inst, Decoder))
4655  Inst.addOperand(MCOperand::createImm(imm32));
4656  return MCDisassembler::Success;
4657 }
4658 
4659 static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Val,
4660  uint64_t Address, const void *Decoder) {
4661  if (Val & ~0xf)
4662  return MCDisassembler::Fail;
4663 
4664  Inst.addOperand(MCOperand::createImm(Val));
4665  return MCDisassembler::Success;
4666 }
4667 
4668 static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Val,
4669  uint64_t Address, const void *Decoder) {
4670  if (Val & ~0xf)
4671  return MCDisassembler::Fail;
4672 
4673  Inst.addOperand(MCOperand::createImm(Val));
4674  return MCDisassembler::Success;
4675 }
4676 
4677 static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Val,
4678  uint64_t Address, const void *Decoder) {
4679  DecodeStatus S = MCDisassembler::Success;
4680  const FeatureBitset &FeatureBits =
4681  ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4682 
4683  if (FeatureBits[ARM::FeatureMClass]) {
4684  unsigned ValLow = Val & 0xff;
4685 
4686  // Validate the SYSm value first.
4687  switch (ValLow) {
4688  case 0: // apsr
4689  case 1: // iapsr
4690  case 2: // eapsr
4691  case 3: // xpsr
4692  case 5: // ipsr
4693  case 6: // epsr
4694  case 7: // iepsr
4695  case 8: // msp
4696  case 9: // psp
4697  case 16: // primask
4698  case 20: // control
4699  break;
4700  case 17: // basepri
4701  case 18: // basepri_max
4702  case 19: // faultmask
4703  if (!(FeatureBits[ARM::HasV7Ops]))
4704  // Values basepri, basepri_max and faultmask are only valid for v7m.
4705  return MCDisassembler::Fail;
4706  break;
4707  case 0x8a: // msplim_ns
4708  case 0x8b: // psplim_ns
4709  case 0x91: // basepri_ns
4710  case 0x93: // faultmask_ns
4711  if (!(FeatureBits[ARM::HasV8MMainlineOps]))
4712  return MCDisassembler::Fail;
4713  LLVM_FALLTHROUGH;
4714  case 10: // msplim
4715  case 11: // psplim
4716  case 0x88: // msp_ns
4717  case 0x89: // psp_ns
4718  case 0x90: // primask_ns
4719  case 0x94: // control_ns
4720  case 0x98: // sp_ns
4721  if (!(FeatureBits[ARM::Feature8MSecExt]))
4722  return MCDisassembler::Fail;
4723  break;
4724  default:
4725  // Architecturally defined as unpredictable
4726  S = MCDisassembler::SoftFail;
4727  break;
4728  }
4729 
4730  if (Inst.getOpcode() == ARM::t2MSR_M) {
4731  unsigned Mask = fieldFromInstruction(Val, 10, 2);
4732  if (!(FeatureBits[ARM::HasV7Ops])) {
4733  // The ARMv6-M MSR bits {11-10} can be only 0b10, other values are
4734  // unpredictable.
4735  if (Mask != 2)
4736  S = MCDisassembler::SoftFail;
4737  }
4738  else {
4739  // The ARMv7-M architecture stores an additional 2-bit mask value in
4740  // MSR bits {11-10}. The mask is used only with apsr, iapsr, eapsr and
4741  // xpsr, it has to be 0b10 in other cases. Bit mask{1} indicates if
4742  // the NZCVQ bits should be moved by the instruction. Bit mask{0}
4743  // indicates the move for the GE{3:0} bits, the mask{0} bit can be set
4744  // only if the processor includes the DSP extension.
4745  if (Mask == 0 || (Mask != 2 && ValLow > 3) ||
4746  (!(FeatureBits[ARM::FeatureDSP]) && (Mask & 1)))
4747  S = MCDisassembler::SoftFail;
4748  }
4749  }
4750  } else {
4751  // A/R class
4752  if (Val == 0)
4753  return MCDisassembler::Fail;
4754  }
4755  Inst.addOperand(MCOperand::createImm(Val));
4756  return S;
4757 }
4758 
4759 static DecodeStatus DecodeBankedReg(MCInst &Inst, unsigned Val,
4760  uint64_t Address, const void *Decoder) {
4761  unsigned R = fieldFromInstruction(Val, 5, 1);
4762  unsigned SysM = fieldFromInstruction(Val, 0, 5);
4763 
4764  // The table of encodings for these banked registers comes from B9.2.3 of the
4765  // ARM ARM. There are patterns, but nothing regular enough to make this logic
4766  // neater. So by fiat, these values are UNPREDICTABLE:
4767  if (!ARMBankedReg::lookupBankedRegByEncoding((R << 5) | SysM))
4768  return MCDisassembler::Fail;
4769 
4770  Inst.addOperand(MCOperand::createImm(Val));
4771  return MCDisassembler::Success;
4772 }
4773 
4774 static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn,
4775  uint64_t Address, const void *Decoder) {
4776  DecodeStatus S = MCDisassembler::Success;
4777 
4778  unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4779  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4780  unsigned pred = fieldFromInstruction(Insn, 28, 4);
4781 
4782  if (Rn == 0xF)
4783  S = MCDisassembler::SoftFail;
4784 
4785  if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder)))
4786  return MCDisassembler::Fail;
4787  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4788  return MCDisassembler::Fail;
4789  if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4790  return MCDisassembler::Fail;
4791 
4792  return S;
4793 }
4794 
4795 static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn,
4796  uint64_t Address,
4797  const void *Decoder) {
4798  DecodeStatus S = MCDisassembler::Success;
4799 
4800  unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4801  unsigned Rt = fieldFromInstruction(Insn, 0, 4);
4802  unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4803  unsigned pred = fieldFromInstruction(Insn, 28, 4);
4804 
4805  if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
4806  return MCDisassembler::Fail;
4807 
4808  if (Rn == 0xF || Rd == Rn || Rd == Rt || Rd == Rt+1)
4809  S = MCDisassembler::SoftFail;
4810 
4811  if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder)))
4812  return MCDisassembler::Fail;
4813  if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4814  return MCDisassembler::Fail;
4815  if (!Check(