LLVM 18.0.0git
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/MCDecoderOps.h"
17#include "llvm/MC/MCDisassembler/MCDisassembler.h"
18#include "llvm/MC/MCInst.h"
19#include "llvm/MC/MCInstrDesc.h"
20#include "llvm/MC/MCInstrInfo.h"
21#include "llvm/MC/MCSubtargetInfo.h"
22#include "llvm/MC/TargetRegistry.h"
23#include "llvm/Support/Compiler.h"
24#include "llvm/Support/ErrorHandling.h"
25#include "llvm/Support/MathExtras.h"
26#include "llvm/Support/raw_ostream.h"
27#include "llvm/TargetParser/SubtargetFeature.h"
28#include <algorithm>
29#include <cassert>
30#include <cstdint>
31#include <vector>
32
33using namespace llvm;
34
35#define DEBUG_TYPE "arm-disassembler"
36
37using DecodeStatus = MCDisassembler::DecodeStatus;
38
39namespace {
40
41 // Handles the condition code status of instructions in IT blocks
42 class ITStatus
43 {
44 public:
45 // Returns the condition code for instruction in IT block
46 unsigned getITCC() {
47 unsigned CC = ARMCC::AL;
48 if (instrInITBlock())
49 CC = ITStates.back();
50 return CC;
51 }
52
53 // Advances the IT block state to the next T or E
54 void advanceITState() {
55 ITStates.pop_back();
56 }
57
58 // Returns true if the current instruction is in an IT block
59 bool instrInITBlock() {
60 return !ITStates.empty();
61 }
62
63 // Returns true if current instruction is the last instruction in an IT block
64 bool instrLastInITBlock() {
65 return ITStates.size() == 1;
66 }
67
68 // Called when decoding an IT instruction. Sets the IT state for
69 // the following instructions that for the IT block. Firstcond
70 // corresponds to the field in the IT instruction encoding; Mask
71 // is in the MCOperand format in which 1 means 'else' and 0 'then'.
72 void setITState(char Firstcond, char Mask) {
73 // (3 - the number of trailing zeros) is the number of then / else.
74 unsigned NumTZ = llvm::countr_zero<uint8_t>(Mask);
75 unsigned char CCBits = static_cast<unsigned char>(Firstcond & 0xf);
76 assert(NumTZ <= 3 && "Invalid IT mask!");
77 // push condition codes onto the stack the correct order for the pops
78 for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) {
79 unsigned Else = (Mask >> Pos) & 1;
80 ITStates.push_back(CCBits ^ Else);
81 }
82 ITStates.push_back(CCBits);
83 }
84
85 private:
86 std::vector<unsigned char> ITStates;
87 };
88
89 class VPTStatus
90 {
91 public:
92 unsigned getVPTPred() {
93 unsigned Pred = ARMVCC::None;
94 if (instrInVPTBlock())
95 Pred = VPTStates.back();
96 return Pred;
97 }
98
99 void advanceVPTState() {
100 VPTStates.pop_back();
101 }
102
103 bool instrInVPTBlock() {
104 return !VPTStates.empty();
105 }
106
107 bool instrLastInVPTBlock() {
108 return VPTStates.size() == 1;
109 }
110
111 void setVPTState(char Mask) {
112 // (3 - the number of trailing zeros) is the number of then / else.
113 unsigned NumTZ = llvm::countr_zero<uint8_t>(Mask);
114 assert(NumTZ <= 3 && "Invalid VPT mask!");
115 // push predicates onto the stack the correct order for the pops
116 for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) {
117 bool T = ((Mask >> Pos) & 1) == 0;
118 if (T)
119 VPTStates.push_back(ARMVCC::Then);
120 else
121 VPTStates.push_back(ARMVCC::Else);
122 }
123 VPTStates.push_back(ARMVCC::Then);
124 }
125
126 private:
127 SmallVector<unsigned char, 4> VPTStates;
128 };
129
130/// ARM disassembler for all ARM platforms.
131class ARMDisassembler : public MCDisassembler {
132public:
133 std::unique_ptr<const MCInstrInfo> MCII;
134
135 ARMDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx,
136 const MCInstrInfo *MCII)
137 : MCDisassembler(STI, Ctx), MCII(MCII) {
138 InstructionEndianness = STI.hasFeature(ARM::ModeBigEndianInstructions)
139 ? llvm::support::big
140 : llvm::support::little;
141 }
142
143 ~ARMDisassembler() override = default;
144
145 DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
146 ArrayRef<uint8_t> Bytes, uint64_t Address,
147 raw_ostream &CStream) const override;
148
149 uint64_t suggestBytesToSkip(ArrayRef<uint8_t> Bytes,
150 uint64_t Address) const override;
151
152private:
153 DecodeStatus getARMInstruction(MCInst &Instr, uint64_t &Size,
154 ArrayRef<uint8_t> Bytes, uint64_t Address,
155 raw_ostream &CStream) const;
156
157 DecodeStatus getThumbInstruction(MCInst &Instr, uint64_t &Size,
158 ArrayRef<uint8_t> Bytes, uint64_t Address,
159 raw_ostream &CStream) const;
160
161 mutable ITStatus ITBlock;
162 mutable VPTStatus VPTBlock;
163
164 void AddThumb1SBit(MCInst &MI, bool InITBlock) const;
165 bool isVectorPredicable(const MCInst &MI) const;
166 DecodeStatus AddThumbPredicate(MCInst&) const;
167 void UpdateThumbVFPPredicate(DecodeStatus &, MCInst&) const;
168
169 llvm::support::endianness InstructionEndianness;
170};
171
172} // end anonymous namespace
173
174// Forward declare these because the autogenerated code will reference them.
175// Definitions are further down.
176static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
177 uint64_t Address,
178 const MCDisassembler *Decoder);
179static DecodeStatus DecodeCLRMGPRRegisterClass(MCInst &Inst, unsigned RegNo,
180 uint64_t Address,
181 const MCDisassembler *Decoder);
182static DecodeStatus DecodetGPROddRegisterClass(MCInst &Inst, unsigned RegNo,
183 uint64_t Address,
184 const MCDisassembler *Decoder);
185static DecodeStatus DecodetGPREvenRegisterClass(MCInst &Inst, unsigned RegNo,
186 uint64_t Address,
187 const MCDisassembler *Decoder);
188static DecodeStatus
189DecodeGPRwithAPSR_NZCVnospRegisterClass(MCInst &Inst, unsigned RegNo,
190 uint64_t Address,
191 const MCDisassembler *Decoder);
192static DecodeStatus DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo,
193 uint64_t Address,
194 const MCDisassembler *Decoder);
195static DecodeStatus DecodeGPRnospRegisterClass(MCInst &Inst, unsigned RegNo,
196 uint64_t Address,
197 const MCDisassembler *Decoder);
198static DecodeStatus
199DecodeGPRwithAPSRRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
200 const MCDisassembler *Decoder);
201static DecodeStatus DecodeGPRwithZRRegisterClass(MCInst &Inst, unsigned RegNo,
202 uint64_t Address,
203 const MCDisassembler *Decoder);
204static DecodeStatus
205DecodeGPRwithZRnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
206 const MCDisassembler *Decoder);
207static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
208 uint64_t Address,
209 const MCDisassembler *Decoder);
210static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
211 uint64_t Address,
212 const MCDisassembler *Decoder);
213static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
214 uint64_t Address,
215 const MCDisassembler *Decoder);
216static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
217 uint64_t Address,
218 const MCDisassembler *Decoder);
219static DecodeStatus
220DecodeGPRPairnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
221 const MCDisassembler *Decoder);
222static DecodeStatus DecodeGPRspRegisterClass(MCInst &Inst, unsigned RegNo,
223 uint64_t Address,
224 const MCDisassembler *Decoder);
225static DecodeStatus DecodeHPRRegisterClass(MCInst &Inst, unsigned RegNo,
226 uint64_t Address,
227 const MCDisassembler *Decoder);
228static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
229 uint64_t Address,
230 const MCDisassembler *Decoder);
231static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
232 uint64_t Address,
233 const MCDisassembler *Decoder);
234static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
235 uint64_t Address,
236 const MCDisassembler *Decoder);
237static DecodeStatus DecodeSPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
238 uint64_t Address,
239 const MCDisassembler *Decoder);
240static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo,
241 uint64_t Address,
242 const MCDisassembler *Decoder);
243static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
244 uint64_t Address,
245 const MCDisassembler *Decoder);
246static DecodeStatus DecodeMQPRRegisterClass(MCInst &Inst, unsigned RegNo,
247 uint64_t Address,
248 const MCDisassembler *Decoder);
249static DecodeStatus DecodeMQQPRRegisterClass(MCInst &Inst, unsigned RegNo,
250 uint64_t Address,
251 const MCDisassembler *Decoder);
252static DecodeStatus DecodeMQQQQPRRegisterClass(MCInst &Inst, unsigned RegNo,
253 uint64_t Address,
254 const MCDisassembler *Decoder);
255static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
256 uint64_t Address,
257 const MCDisassembler *Decoder);
258static DecodeStatus
259DecodeDPairSpacedRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
260 const MCDisassembler *Decoder);
261
262static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
263 uint64_t Address,
264 const MCDisassembler *Decoder);
265static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
266 uint64_t Address,
267 const MCDisassembler *Decoder);
268static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
269 uint64_t Address,
270 const MCDisassembler *Decoder);
271static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
272 uint64_t Address,
273 const MCDisassembler *Decoder);
274static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
275 uint64_t Address,
276 const MCDisassembler *Decoder);
277
278static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Insn,
279 uint64_t Address,
280 const MCDisassembler *Decoder);
281static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
282 uint64_t Address,
283 const MCDisassembler *Decoder);
284static DecodeStatus
285DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
286 const MCDisassembler *Decoder);
287static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Insn,
288 uint64_t Address,
289 const MCDisassembler *Decoder);
290static DecodeStatus DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn,
291 uint64_t Address,
292 const MCDisassembler *Decoder);
293static DecodeStatus DecodeTSBInstruction(MCInst &Inst, unsigned Insn,
294 uint64_t Address,
295 const MCDisassembler *Decoder);
296static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Insn,
297 uint64_t Address,
298 const MCDisassembler *Decoder);
299static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Insn,
300 uint64_t Address,
301 const MCDisassembler *Decoder);
302
303static DecodeStatus
304DecodeMemMultipleWritebackInstruction(MCInst &Inst, unsigned Insn,
305 uint64_t Adddress,
306 const MCDisassembler *Decoder);
307static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
308 uint64_t Address,
309 const MCDisassembler *Decoder);
310static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
311 uint64_t Address,
312 const MCDisassembler *Decoder);
313static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
314 uint64_t Address,
315 const MCDisassembler *Decoder);
316static DecodeStatus DecodeHINTInstruction(MCInst &Inst, unsigned Insn,
317 uint64_t Address,
318 const MCDisassembler *Decoder);
319static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
320 uint64_t Address,
321 const MCDisassembler *Decoder);
322static DecodeStatus DecodeTSTInstruction(MCInst &Inst, unsigned Insn,
323 uint64_t Address,
324 const MCDisassembler *Decoder);
325static DecodeStatus DecodeSETPANInstruction(MCInst &Inst, unsigned Insn,
326 uint64_t Address,
327 const MCDisassembler *Decoder);
328static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
329 uint64_t Address,
330 const MCDisassembler *Decoder);
331static DecodeStatus DecodeT2HintSpaceInstruction(MCInst &Inst, unsigned Insn,
332 uint64_t Address,
333 const MCDisassembler *Decoder);
334static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
335 uint64_t Address,
336 const MCDisassembler *Decoder);
337static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
338 uint64_t Address,
339 const MCDisassembler *Decoder);
340static DecodeStatus DecodeAddrMode5FP16Operand(MCInst &Inst, unsigned Val,
341 uint64_t Address,
342 const MCDisassembler *Decoder);
343static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
344 uint64_t Address,
345 const MCDisassembler *Decoder);
346static DecodeStatus DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
347 uint64_t Address,
348 const MCDisassembler *Decoder);
349static DecodeStatus DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn,
350 uint64_t Address,
351 const MCDisassembler *Decoder);
352static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
353 uint64_t Address,
354 const MCDisassembler *Decoder);
355static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Val,
356 uint64_t Address,
357 const MCDisassembler *Decoder);
358static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Val,
359 uint64_t Address,
360 const MCDisassembler *Decoder);
361static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Val,
362 uint64_t Address,
363 const MCDisassembler *Decoder);
364static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Val,
365 uint64_t Address,
366 const MCDisassembler *Decoder);
367static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Val,
368 uint64_t Address,
369 const MCDisassembler *Decoder);
370static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Val,
371 uint64_t Address,
372 const MCDisassembler *Decoder);
373static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Val,
374 uint64_t Address,
375 const MCDisassembler *Decoder);
376static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Val,
377 uint64_t Address,
378 const MCDisassembler *Decoder);
379static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Val,
380 uint64_t Address,
381 const MCDisassembler *Decoder);
382static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Val,
383 uint64_t Address,
384 const MCDisassembler *Decoder);
385static DecodeStatus DecodeVMOVModImmInstruction(MCInst &Inst, unsigned Val,
386 uint64_t Address,
387 const MCDisassembler *Decoder);
388static DecodeStatus DecodeMVEModImmInstruction(MCInst &Inst, unsigned Val,
389 uint64_t Address,
390 const MCDisassembler *Decoder);
391static DecodeStatus DecodeMVEVADCInstruction(MCInst &Inst, unsigned Insn,
392 uint64_t Address,
393 const MCDisassembler *Decoder);
394static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Val,
395 uint64_t Address,
396 const MCDisassembler *Decoder);
397static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
398 uint64_t Address,
399 const MCDisassembler *Decoder);
400static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
401 uint64_t Address,
402 const MCDisassembler *Decoder);
403static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
404 uint64_t Address,
405 const MCDisassembler *Decoder);
406static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
407 uint64_t Address,
408 const MCDisassembler *Decoder);
409static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
410 uint64_t Address,
411 const MCDisassembler *Decoder);
412static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn,
413 uint64_t Address,
414 const MCDisassembler *Decoder);
415static DecodeStatus DecodeMveAddrModeRQ(MCInst &Inst, unsigned Insn,
416 uint64_t Address,
417 const MCDisassembler *Decoder);
418template <int shift>
419static DecodeStatus DecodeMveAddrModeQ(MCInst &Inst, unsigned Insn,
420 uint64_t Address,
421 const MCDisassembler *Decoder);
422static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Insn,
423 uint64_t Address,
424 const MCDisassembler *Decoder);
425static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Insn,
426 uint64_t Address,
427 const MCDisassembler *Decoder);
428static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Insn,
429 uint64_t Address,
430 const MCDisassembler *Decoder);
431static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Insn, uint64_t Address,
432 const MCDisassembler *Decoder);
433static DecodeStatus DecodeBankedReg(MCInst &Inst, unsigned Insn,
434 uint64_t Address,
435 const MCDisassembler *Decoder);
436static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn,
437 uint64_t Address,
438 const MCDisassembler *Decoder);
439static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn,
440 uint64_t Address,
441 const MCDisassembler *Decoder);
442static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn,
443 uint64_t Address,
444 const MCDisassembler *Decoder);
445static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn,
446 uint64_t Address,
447 const MCDisassembler *Decoder);
448static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn,
449 uint64_t Address,
450 const MCDisassembler *Decoder);
451static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn,
452 uint64_t Address,
453 const MCDisassembler *Decoder);
454static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn, uint64_t Address,
455 const MCDisassembler *Decoder);
456static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn, uint64_t Address,
457 const MCDisassembler *Decoder);
458static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn, uint64_t Address,
459 const MCDisassembler *Decoder);
460static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn, uint64_t Address,
461 const MCDisassembler *Decoder);
462static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn, uint64_t Address,
463 const MCDisassembler *Decoder);
464static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn, uint64_t Address,
465 const MCDisassembler *Decoder);
466static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn, uint64_t Address,
467 const MCDisassembler *Decoder);
468static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn, uint64_t Address,
469 const MCDisassembler *Decoder);
470static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn, uint64_t Address,
471 const MCDisassembler *Decoder);
472static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn, uint64_t Address,
473 const MCDisassembler *Decoder);
474static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn, uint64_t Address,
475 const MCDisassembler *Decoder);
476static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn, uint64_t Address,
477 const MCDisassembler *Decoder);
478static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn, uint64_t Address,
479 const MCDisassembler *Decoder);
480static DecodeStatus DecodeVCVTImmOperand(MCInst &Inst, unsigned Insn,
481 uint64_t Address,
482 const MCDisassembler *Decoder);
483static DecodeStatus
484DecodeNEONComplexLane64Instruction(MCInst &Inst, unsigned Val, uint64_t Address,
485 const MCDisassembler *Decoder);
486
487static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
488 uint64_t Address,
489 const MCDisassembler *Decoder);
490static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
491 uint64_t Address,
492 const MCDisassembler *Decoder);
493static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
494 uint64_t Address,
495 const MCDisassembler *Decoder);
496static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
497 uint64_t Address,
498 const MCDisassembler *Decoder);
499static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
500 uint64_t Address,
501 const MCDisassembler *Decoder);
502static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
503 uint64_t Address,
504 const MCDisassembler *Decoder);
505static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
506 uint64_t Address,
507 const MCDisassembler *Decoder);
508static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
509 uint64_t Address,
510 const MCDisassembler *Decoder);
511static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
512 uint64_t Address,
513 const MCDisassembler *Decoder);
514static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Val,
515 uint64_t Address,
516 const MCDisassembler *Decoder);
517static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
518 uint64_t Address,
519 const MCDisassembler *Decoder);
520static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
521 uint64_t Address,
522 const MCDisassembler *Decoder);
523static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn, uint64_t Address,
524 const MCDisassembler *Decoder);
525static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
526 uint64_t Address,
527 const MCDisassembler *Decoder);
528static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val, uint64_t Address,
529 const MCDisassembler *Decoder);
530static DecodeStatus DecodeT2Imm7S4(MCInst &Inst, unsigned Val, uint64_t Address,
531 const MCDisassembler *Decoder);
532static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
533 uint64_t Address,
534 const MCDisassembler *Decoder);
535static DecodeStatus DecodeT2AddrModeImm7s4(MCInst &Inst, unsigned Val,
536 uint64_t Address,
537 const MCDisassembler *Decoder);
538static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst, unsigned Val,
539 uint64_t Address,
540 const MCDisassembler *Decoder);
541static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val, uint64_t Address,
542 const MCDisassembler *Decoder);
543template <int shift>
544static DecodeStatus DecodeT2Imm7(MCInst &Inst, unsigned Val, uint64_t Address,
545 const MCDisassembler *Decoder);
546static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
547 uint64_t Address,
548 const MCDisassembler *Decoder);
549template <int shift>
550static DecodeStatus DecodeTAddrModeImm7(MCInst &Inst, unsigned Val,
551 uint64_t Address,
552 const MCDisassembler *Decoder);
553template <int shift, int WriteBack>
554static DecodeStatus DecodeT2AddrModeImm7(MCInst &Inst, unsigned Val,
555 uint64_t Address,
556 const MCDisassembler *Decoder);
557static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Val,
558 uint64_t Address,
559 const MCDisassembler *Decoder);
560static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
561 uint64_t Address,
562 const MCDisassembler *Decoder);
563static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn,
564 uint64_t Address,
565 const MCDisassembler *Decoder);
566static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
567 uint64_t Address,
568 const MCDisassembler *Decoder);
569static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Insn,
570 uint64_t Address,
571 const MCDisassembler *Decoder);
572static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
573 uint64_t Address,
574 const MCDisassembler *Decoder);
575static DecodeStatus DecodeThumbTableBranch(MCInst &Inst, unsigned Val,
576 uint64_t Address,
577 const MCDisassembler *Decoder);
578static DecodeStatus DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Val,
579 uint64_t Address,
580 const MCDisassembler *Decoder);
581static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val, uint64_t Address,
582 const MCDisassembler *Decoder);
583static DecodeStatus DecodeThumbBCCTargetOperand(MCInst &Inst, unsigned Val,
584 uint64_t Address,
585 const MCDisassembler *Decoder);
586static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val,
587 uint64_t Address,
588 const MCDisassembler *Decoder);
589static DecodeStatus DecodeIT(MCInst &Inst, unsigned Val, uint64_t Address,
590 const MCDisassembler *Decoder);
591static DecodeStatus DecodeT2LDRDPreInstruction(MCInst &Inst, unsigned Insn,
592 uint64_t Address,
593 const MCDisassembler *Decoder);
594static DecodeStatus DecodeT2STRDPreInstruction(MCInst &Inst, unsigned Insn,
595 uint64_t Address,
596 const MCDisassembler *Decoder);
597static DecodeStatus DecodeT2Adr(MCInst &Inst, unsigned Val, uint64_t Address,
598 const MCDisassembler *Decoder);
599static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Val,
600 uint64_t Address,
601 const MCDisassembler *Decoder);
602static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, unsigned Val,
603 uint64_t Address,
604 const MCDisassembler *Decoder);
605
606static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val, uint64_t Address,
607 const MCDisassembler *Decoder);
608static DecodeStatus DecoderForMRRC2AndMCRR2(MCInst &Inst, unsigned Val,
609 uint64_t Address,
610 const MCDisassembler *Decoder);
611static DecodeStatus DecodeForVMRSandVMSR(MCInst &Inst, unsigned Val,
612 uint64_t Address,
613 const MCDisassembler *Decoder);
614
615template <bool isSigned, bool isNeg, bool zeroPermitted, int size>
616static DecodeStatus DecodeBFLabelOperand(MCInst &Inst, unsigned val,
617 uint64_t Address,
618 const MCDisassembler *Decoder);
619static DecodeStatus DecodeBFAfterTargetOperand(MCInst &Inst, unsigned val,
620 uint64_t Address,
621 const MCDisassembler *Decoder);
622static DecodeStatus DecodePredNoALOperand(MCInst &Inst, unsigned Val,
623 uint64_t Address,
624 const MCDisassembler *Decoder);
625static DecodeStatus DecodeLOLoop(MCInst &Inst, unsigned Insn, uint64_t Address,
626 const MCDisassembler *Decoder);
627static DecodeStatus DecodeLongShiftOperand(MCInst &Inst, unsigned Val,
628 uint64_t Address,
629 const MCDisassembler *Decoder);
630static DecodeStatus DecodeVSCCLRM(MCInst &Inst, unsigned Insn, uint64_t Address,
631 const MCDisassembler *Decoder);
632static DecodeStatus DecodeVPTMaskOperand(MCInst &Inst, unsigned Val,
633 uint64_t Address,
634 const MCDisassembler *Decoder);
635static DecodeStatus DecodeVpredROperand(MCInst &Inst, unsigned Val,
636 uint64_t Address,
637 const MCDisassembler *Decoder);
638static DecodeStatus DecodeVpredNOperand(MCInst &Inst, unsigned Val,
639 uint64_t Address,
640 const MCDisassembler *Decoder);
641static DecodeStatus
642DecodeRestrictedIPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
643 const MCDisassembler *Decoder);
644static DecodeStatus
645DecodeRestrictedSPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
646 const MCDisassembler *Decoder);
647static DecodeStatus
648DecodeRestrictedUPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
649 const MCDisassembler *Decoder);
650static DecodeStatus
651DecodeRestrictedFPPredicateOperand(MCInst &Inst, unsigned Val, uint64_t Address,
652 const MCDisassembler *Decoder);
653template <bool Writeback>
654static DecodeStatus DecodeVSTRVLDR_SYSREG(MCInst &Inst, unsigned Insn,
655 uint64_t Address,
656 const MCDisassembler *Decoder);
657template <int shift>
658static DecodeStatus DecodeMVE_MEM_1_pre(MCInst &Inst, unsigned Val,
659 uint64_t Address,
660 const MCDisassembler *Decoder);
661template <int shift>
662static DecodeStatus DecodeMVE_MEM_2_pre(MCInst &Inst, unsigned Val,
663 uint64_t Address,
664 const MCDisassembler *Decoder);
665template <int shift>
666static DecodeStatus DecodeMVE_MEM_3_pre(MCInst &Inst, unsigned Val,
667 uint64_t Address,
668 const MCDisassembler *Decoder);
669template <unsigned MinLog, unsigned MaxLog>
670static DecodeStatus DecodePowerTwoOperand(MCInst &Inst, unsigned Val,
671 uint64_t Address,
672 const MCDisassembler *Decoder);
673template <unsigned start>
674static DecodeStatus
675DecodeMVEPairVectorIndexOperand(MCInst &Inst, unsigned Val, uint64_t Address,
676 const MCDisassembler *Decoder);
677static DecodeStatus DecodeMVEVMOVQtoDReg(MCInst &Inst, unsigned Insn,
678 uint64_t Address,
679 const MCDisassembler *Decoder);
680static DecodeStatus DecodeMVEVMOVDRegtoQ(MCInst &Inst, unsigned Insn,
681 uint64_t Address,
682 const MCDisassembler *Decoder);
683static DecodeStatus DecodeMVEVCVTt1fp(MCInst &Inst, unsigned Insn,
684 uint64_t Address,
685 const MCDisassembler *Decoder);
686typedef DecodeStatus OperandDecoder(MCInst &Inst, unsigned Val,
687 uint64_t Address,
688 const MCDisassembler *Decoder);
689template <bool scalar, OperandDecoder predicate_decoder>
690static DecodeStatus DecodeMVEVCMP(MCInst &Inst, unsigned Insn, uint64_t Address,
691 const MCDisassembler *Decoder);
692static DecodeStatus DecodeMveVCTP(MCInst &Inst, unsigned Insn, uint64_t Address,
693 const MCDisassembler *Decoder);
694static DecodeStatus DecodeMVEVPNOT(MCInst &Inst, unsigned Insn,
695 uint64_t Address,
696 const MCDisassembler *Decoder);
697static DecodeStatus
698DecodeMVEOverlappingLongShift(MCInst &Inst, unsigned Insn, uint64_t Address,
699 const MCDisassembler *Decoder);
700static DecodeStatus DecodeT2AddSubSPImm(MCInst &Inst, unsigned Insn,
701 uint64_t Address,
702 const MCDisassembler *Decoder);
703
704#include "ARMGenDisassemblerTables.inc"
705
706static MCDisassembler *createARMDisassembler(const Target &T,
707 const MCSubtargetInfo &STI,
708 MCContext &Ctx) {
709 return new ARMDisassembler(STI, Ctx, T.createMCInstrInfo());
710}
711
712// Post-decoding checks
713static DecodeStatus checkDecodedInstruction(MCInst &MI, uint64_t &Size,
714 uint64_t Address, raw_ostream &CS,
715 uint32_t Insn,
716 DecodeStatus Result) {
717 switch (MI.getOpcode()) {
718 case ARM::HVC: {
719 // HVC is undefined if condition = 0xf otherwise upredictable
720 // if condition != 0xe
721 uint32_t Cond = (Insn >> 28) & 0xF;
722 if (Cond == 0xF)
723 return MCDisassembler::Fail;
724 if (Cond != 0xE)
725 return MCDisassembler::SoftFail;
726 return Result;
727 }
728 case ARM::t2ADDri:
729 case ARM::t2ADDri12:
730 case ARM::t2ADDrr:
731 case ARM::t2ADDrs:
732 case ARM::t2SUBri:
733 case ARM::t2SUBri12:
734 case ARM::t2SUBrr:
735 case ARM::t2SUBrs:
736 if (MI.getOperand(0).getReg() == ARM::SP &&
737 MI.getOperand(1).getReg() != ARM::SP)
738 return MCDisassembler::SoftFail;
739 return Result;
740 default: return Result;
741 }
742}
743
744uint64_t ARMDisassembler::suggestBytesToSkip(ArrayRef<uint8_t> Bytes,
745 uint64_t Address) const {
746 // In Arm state, instructions are always 4 bytes wide, so there's no
747 // point in skipping any smaller number of bytes if an instruction
748 // can't be decoded.
749 if (!STI.hasFeature(ARM::ModeThumb))
750 return 4;
751
752 // In a Thumb instruction stream, a halfword is a standalone 2-byte
753 // instruction if and only if its value is less than 0xE800.
754 // Otherwise, it's the first halfword of a 4-byte instruction.
755 //
756 // So, if we can see the upcoming halfword, we can judge on that
757 // basis, and maybe skip a whole 4-byte instruction that we don't
758 // know how to decode, without accidentally trying to interpret its
759 // second half as something else.
760 //
761 // If we don't have the instruction data available, we just have to
762 // recommend skipping the minimum sensible distance, which is 2
763 // bytes.
764 if (Bytes.size() < 2)
765 return 2;
766
767 uint16_t Insn16 = llvm::support::endian::read<uint16_t>(
768 Bytes.data(), InstructionEndianness);
769 return Insn16 < 0xE800 ? 2 : 4;
770}
771
772DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
773 ArrayRef<uint8_t> Bytes,
774 uint64_t Address,
775 raw_ostream &CS) const {
776 if (STI.hasFeature(ARM::ModeThumb))
777 return getThumbInstruction(MI, Size, Bytes, Address, CS);
778 return getARMInstruction(MI, Size, Bytes, Address, CS);
779}
780
781DecodeStatus ARMDisassembler::getARMInstruction(MCInst &MI, uint64_t &Size,
782 ArrayRef<uint8_t> Bytes,
783 uint64_t Address,
784 raw_ostream &CS) const {
785 CommentStream = &CS;
786
787 assert(!STI.hasFeature(ARM::ModeThumb) &&
788 "Asked to disassemble an ARM instruction but Subtarget is in Thumb "
789 "mode!");
790
791 // We want to read exactly 4 bytes of data.
792 if (Bytes.size() < 4) {
793 Size = 0;
794 return MCDisassembler::Fail;
795 }
796
797 // Encoded as a 32-bit word in the stream.
798 uint32_t Insn = llvm::support::endian::read<uint32_t>(Bytes.data(),
799 InstructionEndianness);
800
801 // Calling the auto-generated decoder function.
802 DecodeStatus Result =
803 decodeInstruction(DecoderTableARM32, MI, Insn, Address, this, STI);
804 if (Result != MCDisassembler::Fail) {
805 Size = 4;
806 return checkDecodedInstruction(MI, Size, Address, CS, Insn, Result);
807 }
808
809 struct DecodeTable {
810 const uint8_t *P;
811 bool DecodePred;
812 };
813
814 const DecodeTable Tables[] = {
815 {DecoderTableVFP32, false}, {DecoderTableVFPV832, false},
816 {DecoderTableNEONData32, true}, {DecoderTableNEONLoadStore32, true},
817 {DecoderTableNEONDup32, true}, {DecoderTablev8NEON32, false},
818 {DecoderTablev8Crypto32, false},
819 };
820
821 for (auto Table : Tables) {
822 Result = decodeInstruction(Table.P, MI, Insn, Address, this, STI);
823 if (Result != MCDisassembler::Fail) {
824 Size = 4;
825 // Add a fake predicate operand, because we share these instruction
826 // definitions with Thumb2 where these instructions are predicable.
827 if (Table.DecodePred && !DecodePredicateOperand(MI, 0xE, Address, this))
828 return MCDisassembler::Fail;
829 return Result;
830 }
831 }
832
833 Result =
834 decodeInstruction(DecoderTableCoProc32, MI, Insn, Address, this, STI);
835 if (Result != MCDisassembler::Fail) {
836 Size = 4;
837 return checkDecodedInstruction(MI, Size, Address, CS, Insn, Result);
838 }
839
840 Size = 4;
841 return MCDisassembler::Fail;
842}
843
844/// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the
845/// immediate Value in the MCInst. The immediate Value has had any PC
846/// adjustment made by the caller. If the instruction is a branch instruction
847/// then isBranch is true, else false. If the getOpInfo() function was set as
848/// part of the setupForSymbolicDisassembly() call then that function is called
849/// to get any symbolic information at the Address for this instruction. If
850/// that returns non-zero then the symbolic information it returns is used to
851/// create an MCExpr and that is added as an operand to the MCInst. If
852/// getOpInfo() returns zero and isBranch is true then a symbol look up for
853/// Value is done and if a symbol is found an MCExpr is created with that, else
854/// an MCExpr with Value is created. This function returns true if it adds an
855/// operand to the MCInst and false otherwise.
856static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value,
857 bool isBranch, uint64_t InstSize,
858 MCInst &MI,
859 const MCDisassembler *Decoder) {
860 // FIXME: Does it make sense for value to be negative?
861 return Decoder->tryAddingSymbolicOperand(MI, (uint32_t)Value, Address,
862 isBranch, /*Offset=*/0, /*OpSize=*/0,
863 InstSize);
864}
865
866/// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being
867/// referenced by a load instruction with the base register that is the Pc.
868/// These can often be values in a literal pool near the Address of the
869/// instruction. The Address of the instruction and its immediate Value are
870/// used as a possible literal pool entry. The SymbolLookUp call back will
871/// return the name of a symbol referenced by the literal pool's entry if
872/// the referenced address is that of a symbol. Or it will return a pointer to
873/// a literal 'C' string if the referenced address of the literal pool's entry
874/// is an address into a section with 'C' string literals.
875static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value,
876 const MCDisassembler *Decoder) {
877 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
878 Dis->tryAddingPcLoadReferenceComment(Value, Address);
879}
880
881// Thumb1 instructions don't have explicit S bits. Rather, they
882// implicitly set CPSR. Since it's not represented in the encoding, the
883// auto-generated decoder won't inject the CPSR operand. We need to fix
884// that as a post-pass.
885void ARMDisassembler::AddThumb1SBit(MCInst &MI, bool InITBlock) const {
886 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
887 MCInst::iterator I = MI.begin();
888 for (unsigned i = 0; i < MCID.NumOperands; ++i, ++I) {
889 if (I == MI.end()) break;
890 if (MCID.operands()[i].isOptionalDef() &&
891 MCID.operands()[i].RegClass == ARM::CCRRegClassID) {
892 if (i > 0 && MCID.operands()[i - 1].isPredicate())
893 continue;
894 MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR));
895 return;
896 }
897 }
898
899 MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR));
900}
901
902bool ARMDisassembler::isVectorPredicable(const MCInst &MI) const {
903 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
904 for (unsigned i = 0; i < MCID.NumOperands; ++i) {
905 if (ARM::isVpred(MCID.operands()[i].OperandType))
906 return true;
907 }
908 return false;
909}
910
911// Most Thumb instructions don't have explicit predicates in the
912// encoding, but rather get their predicates from IT context. We need
913// to fix up the predicate operands using this context information as a
914// post-pass.
915MCDisassembler::DecodeStatus
916ARMDisassembler::AddThumbPredicate(MCInst &MI) const {
917 MCDisassembler::DecodeStatus S = Success;
918
919 const FeatureBitset &FeatureBits = getSubtargetInfo().getFeatureBits();
920
921 // A few instructions actually have predicates encoded in them. Don't
922 // try to overwrite it if we're seeing one of those.
923 switch (MI.getOpcode()) {
924 case ARM::tBcc:
925 case ARM::t2Bcc:
926 case ARM::tCBZ:
927 case ARM::tCBNZ:
928 case ARM::tCPS:
929 case ARM::t2CPS3p:
930 case ARM::t2CPS2p:
931 case ARM::t2CPS1p:
932 case ARM::t2CSEL:
933 case ARM::t2CSINC:
934 case ARM::t2CSINV:
935 case ARM::t2CSNEG:
936 case ARM::tMOVSr:
937 case ARM::tSETEND:
938 // Some instructions (mostly conditional branches) are not
939 // allowed in IT blocks.
940 if (ITBlock.instrInITBlock())
941 S = SoftFail;
942 else
943 return Success;
944 break;
945 case ARM::t2HINT:
946 if (MI.getOperand(0).getImm() == 0x10 && (FeatureBits[ARM::FeatureRAS]) != 0)
947 S = SoftFail;
948 break;
949 case ARM::tB:
950 case ARM::t2B:
951 case ARM::t2TBB:
952 case ARM::t2TBH:
953 // Some instructions (mostly unconditional branches) can
954 // only appears at the end of, or outside of, an IT.
955 if (ITBlock.instrInITBlock() && !ITBlock.instrLastInITBlock())
956 S = SoftFail;
957 break;
958 default:
959 break;
960 }
961
962 // Warn on non-VPT predicable instruction in a VPT block and a VPT
963 // predicable instruction in an IT block
964 if ((!isVectorPredicable(MI) && VPTBlock.instrInVPTBlock()) ||
965 (isVectorPredicable(MI) && ITBlock.instrInITBlock()))
966 S = SoftFail;
967
968 // If we're in an IT/VPT block, base the predicate on that. Otherwise,
969 // assume a predicate of AL.
970 unsigned CC = ARMCC::AL;
971 unsigned VCC = ARMVCC::None;
972 if (ITBlock.instrInITBlock()) {
973 CC = ITBlock.getITCC();
974 ITBlock.advanceITState();
975 } else if (VPTBlock.instrInVPTBlock()) {
976 VCC = VPTBlock.getVPTPred();
977 VPTBlock.advanceVPTState();
978 }
979
980 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
981
982 MCInst::iterator CCI = MI.begin();
983 for (unsigned i = 0; i < MCID.NumOperands; ++i, ++CCI) {
984 if (MCID.operands()[i].isPredicate() || CCI == MI.end())
985 break;
986 }
987
988 if (MCID.isPredicable()) {
989 CCI = MI.insert(CCI, MCOperand::createImm(CC));
990 ++CCI;
991 if (CC == ARMCC::AL)
992 MI.insert(CCI, MCOperand::createReg(0));
993 else
994 MI.insert(CCI, MCOperand::createReg(ARM::CPSR));
995 } else if (CC != ARMCC::AL) {
996 Check(S, SoftFail);
997 }
998
999 MCInst::iterator VCCI = MI.begin();
1000 unsigned VCCPos;
1001 for (VCCPos = 0; VCCPos < MCID.NumOperands; ++VCCPos, ++VCCI) {
1002 if (ARM::isVpred(MCID.operands()[VCCPos].OperandType) || VCCI == MI.end())
1003 break;
1004 }
1005
1006 if (isVectorPredicable(MI)) {
1007 VCCI = MI.insert(VCCI, MCOperand::createImm(VCC));
1008 ++VCCI;
1009 if (VCC == ARMVCC::None)
1010 VCCI = MI.insert(VCCI, MCOperand::createReg(0));
1011 else
1012 VCCI = MI.insert(VCCI, MCOperand::createReg(ARM::P0));
1013 ++VCCI;
1014 VCCI = MI.insert(VCCI, MCOperand::createReg(0));
1015 ++VCCI;
1016 if (MCID.operands()[VCCPos].OperandType == ARM::OPERAND_VPRED_R) {
1017 int TiedOp = MCID.getOperandConstraint(VCCPos + 3, MCOI::TIED_TO);
1018 assert(TiedOp >= 0 &&
1019 "Inactive register in vpred_r is not tied to an output!");
1020 // Copy the operand to ensure it's not invalidated when MI grows.
1021 MI.insert(VCCI, MCOperand(MI.getOperand(TiedOp)));
1022 }
1023 } else if (VCC != ARMVCC::None) {
1024 Check(S, SoftFail);
1025 }
1026
1027 return S;
1028}
1029
1030// Thumb VFP instructions are a special case. Because we share their
1031// encodings between ARM and Thumb modes, and they are predicable in ARM
1032// mode, the auto-generated decoder will give them an (incorrect)
1033// predicate operand. We need to rewrite these operands based on the IT
1034// context as a post-pass.
1035void ARMDisassembler::UpdateThumbVFPPredicate(
1036 DecodeStatus &S, MCInst &MI) const {
1037 unsigned CC;
1038 CC = ITBlock.getITCC();
1039 if (CC == 0xF)
1040 CC = ARMCC::AL;
1041 if (ITBlock.instrInITBlock())
1042 ITBlock.advanceITState();
1043 else if (VPTBlock.instrInVPTBlock()) {
1044 CC = VPTBlock.getVPTPred();
1045 VPTBlock.advanceVPTState();
1046 }
1047
1048 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
1049 ArrayRef<MCOperandInfo> OpInfo = MCID.operands();
1050 MCInst::iterator I = MI.begin();
1051 unsigned short NumOps = MCID.NumOperands;
1052 for (unsigned i = 0; i < NumOps; ++i, ++I) {
1053 if (OpInfo[i].isPredicate() ) {
1054 if (CC != ARMCC::AL && !MCID.isPredicable())
1055 Check(S, SoftFail);
1056 I->setImm(CC);
1057 ++I;
1058 if (CC == ARMCC::AL)
1059 I->setReg(0);
1060 else
1061 I->setReg(ARM::CPSR);
1062 return;
1063 }
1064 }
1065}
1066
1067DecodeStatus ARMDisassembler::getThumbInstruction(MCInst &MI, uint64_t &Size,
1068 ArrayRef<uint8_t> Bytes,
1069 uint64_t Address,
1070 raw_ostream &CS) const {
1071 CommentStream = &CS;
1072
1073 assert(STI.hasFeature(ARM::ModeThumb) &&
1074 "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!");
1075
1076 // We want to read exactly 2 bytes of data.
1077 if (Bytes.size() < 2) {
1078 Size = 0;
1079 return MCDisassembler::Fail;
1080 }
1081
1082 uint16_t Insn16 = llvm::support::endian::read<uint16_t>(
1083 Bytes.data(), InstructionEndianness);
1084 DecodeStatus Result =
1085 decodeInstruction(DecoderTableThumb16, MI, Insn16, Address, this, STI);
1086 if (Result != MCDisassembler::Fail) {
1087 Size = 2;
1088 Check(Result, AddThumbPredicate(MI));
1089 return Result;
1090 }
1091
1092 Result = decodeInstruction(DecoderTableThumbSBit16, MI, Insn16, Address, this,
1093 STI);
1094 if (Result) {
1095 Size = 2;
1096 bool InITBlock = ITBlock.instrInITBlock();
1097 Check(Result, AddThumbPredicate(MI));
1098 AddThumb1SBit(MI, InITBlock);
1099 return Result;
1100 }
1101
1102 Result =
1103 decodeInstruction(DecoderTableThumb216, MI, Insn16, Address, this, STI);
1104 if (Result != MCDisassembler::Fail) {
1105 Size = 2;
1106
1107 // Nested IT blocks are UNPREDICTABLE. Must be checked before we add
1108 // the Thumb predicate.
1109 if (MI.getOpcode() == ARM::t2IT && ITBlock.instrInITBlock())
1110 Result = MCDisassembler::SoftFail;
1111
1112 Check(Result, AddThumbPredicate(MI));
1113
1114 // If we find an IT instruction, we need to parse its condition
1115 // code and mask operands so that we can apply them correctly
1116 // to the subsequent instructions.
1117 if (MI.getOpcode() == ARM::t2IT) {
1118 unsigned Firstcond = MI.getOperand(0).getImm();
1119 unsigned Mask = MI.getOperand(1).getImm();
1120 ITBlock.setITState(Firstcond, Mask);
1121
1122 // An IT instruction that would give a 'NV' predicate is unpredictable.
1123 if (Firstcond == ARMCC::AL && !isPowerOf2_32(Mask))
1124 CS << "unpredictable IT predicate sequence";
1125 }
1126
1127 return Result;
1128 }
1129
1130 // We want to read exactly 4 bytes of data.
1131 if (Bytes.size() < 4) {
1132 Size = 0;
1133 return MCDisassembler::Fail;
1134 }
1135
1136 uint32_t Insn32 =
1137 (uint32_t(Insn16) << 16) | llvm::support::endian::read<uint16_t>(
1138 Bytes.data() + 2, InstructionEndianness);
1139
1140 Result =
1141 decodeInstruction(DecoderTableMVE32, MI, Insn32, Address, this, STI);
1142 if (Result != MCDisassembler::Fail) {
1143 Size = 4;
1144
1145 // Nested VPT blocks are UNPREDICTABLE. Must be checked before we add
1146 // the VPT predicate.
1147 if (isVPTOpcode(MI.getOpcode()) && VPTBlock.instrInVPTBlock())
1148 Result = MCDisassembler::SoftFail;
1149
1150 Check(Result, AddThumbPredicate(MI));
1151
1152 if (isVPTOpcode(MI.getOpcode())) {
1153 unsigned Mask = MI.getOperand(0).getImm();
1154 VPTBlock.setVPTState(Mask);
1155 }
1156
1157 return Result;
1158 }
1159
1160 Result =
1161 decodeInstruction(DecoderTableThumb32, MI, Insn32, Address, this, STI);
1162 if (Result != MCDisassembler::Fail) {
1163 Size = 4;
1164 bool InITBlock = ITBlock.instrInITBlock();
1165 Check(Result, AddThumbPredicate(MI));
1166 AddThumb1SBit(MI, InITBlock);
1167 return Result;
1168 }
1169
1170 Result =
1171 decodeInstruction(DecoderTableThumb232, MI, Insn32, Address, this, STI);
1172 if (Result != MCDisassembler::Fail) {
1173 Size = 4;
1174 Check(Result, AddThumbPredicate(MI));
1175 return checkDecodedInstruction(MI, Size, Address, CS, Insn32, Result);
1176 }
1177
1178 if (fieldFromInstruction(Insn32, 28, 4) == 0xE) {
1179 Result =
1180 decodeInstruction(DecoderTableVFP32, MI, Insn32, Address, this, STI);
1181 if (Result != MCDisassembler::Fail) {
1182 Size = 4;
1183 UpdateThumbVFPPredicate(Result, MI);
1184 return Result;
1185 }
1186 }
1187
1188 Result =
1189 decodeInstruction(DecoderTableVFPV832, MI, Insn32, Address, this, STI);
1190 if (Result != MCDisassembler::Fail) {
1191 Size = 4;
1192 return Result;
1193 }
1194
1195 if (fieldFromInstruction(Insn32, 28, 4) == 0xE) {
1196 Result = decodeInstruction(DecoderTableNEONDup32, MI, Insn32, Address, this,
1197 STI);
1198 if (Result != MCDisassembler::Fail) {
1199 Size = 4;
1200 Check(Result, AddThumbPredicate(MI));
1201 return Result;
1202 }
1203 }
1204
1205 if (fieldFromInstruction(Insn32, 24, 8) == 0xF9) {
1206 uint32_t NEONLdStInsn = Insn32;
1207 NEONLdStInsn &= 0xF0FFFFFF;
1208 NEONLdStInsn |= 0x04000000;
1209 Result = decodeInstruction(DecoderTableNEONLoadStore32, MI, NEONLdStInsn,
1210 Address, this, STI);
1211 if (Result != MCDisassembler::Fail) {
1212 Size = 4;
1213 Check(Result, AddThumbPredicate(MI));
1214 return Result;
1215 }
1216 }
1217
1218 if (fieldFromInstruction(Insn32, 24, 4) == 0xF) {
1219 uint32_t NEONDataInsn = Insn32;
1220 NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24
1221 NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
1222 NEONDataInsn |= 0x12000000; // Set bits 28 and 25
1223 Result = decodeInstruction(DecoderTableNEONData32, MI, NEONDataInsn,
1224 Address, this, STI);
1225 if (Result != MCDisassembler::Fail) {
1226 Size = 4;
1227 Check(Result, AddThumbPredicate(MI));
1228 return Result;
1229 }
1230
1231 uint32_t NEONCryptoInsn = Insn32;
1232 NEONCryptoInsn &= 0xF0FFFFFF; // Clear bits 27-24
1233 NEONCryptoInsn |= (NEONCryptoInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
1234 NEONCryptoInsn |= 0x12000000; // Set bits 28 and 25
1235 Result = decodeInstruction(DecoderTablev8Crypto32, MI, NEONCryptoInsn,
1236 Address, this, STI);
1237 if (Result != MCDisassembler::Fail) {
1238 Size = 4;
1239 return Result;
1240 }
1241
1242 uint32_t NEONv8Insn = Insn32;
1243 NEONv8Insn &= 0xF3FFFFFF; // Clear bits 27-26
1244 Result = decodeInstruction(DecoderTablev8NEON32, MI, NEONv8Insn, Address,
1245 this, STI);
1246 if (Result != MCDisassembler::Fail) {
1247 Size = 4;
1248 return Result;
1249 }
1250 }
1251
1252 uint32_t Coproc = fieldFromInstruction(Insn32, 8, 4);
1253 const uint8_t *DecoderTable = ARM::isCDECoproc(Coproc, STI)
1254 ? DecoderTableThumb2CDE32
1255 : DecoderTableThumb2CoProc32;
1256 Result =
1257 decodeInstruction(DecoderTable, MI, Insn32, Address, this, STI);
1258 if (Result != MCDisassembler::Fail) {
1259 Size = 4;
1260 Check(Result, AddThumbPredicate(MI));
1261 return Result;
1262 }
1263
1264 Size = 0;
1265 return MCDisassembler::Fail;
1266}
1267
1268extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMDisassembler() {
1269 TargetRegistry::RegisterMCDisassembler(getTheARMLETarget(),
1270 createARMDisassembler);
1271 TargetRegistry::RegisterMCDisassembler(getTheARMBETarget(),
1272 createARMDisassembler);
1273 TargetRegistry::RegisterMCDisassembler(getTheThumbLETarget(),
1274 createARMDisassembler);
1275 TargetRegistry::RegisterMCDisassembler(getTheThumbBETarget(),
1276 createARMDisassembler);
1277}
1278
1279static const uint16_t GPRDecoderTable[] = {
1280 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1281 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1282 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1283 ARM::R12, ARM::SP, ARM::LR, ARM::PC
1284};
1285
1286static const uint16_t CLRMGPRDecoderTable[] = {
1287 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1288 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1289 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1290 ARM::R12, 0, ARM::LR, ARM::APSR
1291};
1292
1293static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1294 uint64_t Address,
1295 const MCDisassembler *Decoder) {
1296 if (RegNo > 15)
1297 return MCDisassembler::Fail;
1298
1299 unsigned Register = GPRDecoderTable[RegNo];
1300 Inst.addOperand(MCOperand::createReg(Register));
1301 return MCDisassembler::Success;
1302}
1303
1304static DecodeStatus DecodeCLRMGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1305 uint64_t Address,
1306 const MCDisassembler *Decoder) {
1307 if (RegNo > 15)
1308 return MCDisassembler::Fail;
1309
1310 unsigned Register = CLRMGPRDecoderTable[RegNo];
1311 if (Register == 0)
1312 return MCDisassembler::Fail;
1313
1314 Inst.addOperand(MCOperand::createReg(Register));
1315 return MCDisassembler::Success;
1316}
1317
1318static DecodeStatus DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo,
1319 uint64_t Address,
1320 const MCDisassembler *Decoder) {
1321 DecodeStatus S = MCDisassembler::Success;
1322
1323 if (RegNo == 15)
1324 S = MCDisassembler::SoftFail;
1325
1326 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1327
1328 return S;
1329}
1330
1331static DecodeStatus DecodeGPRnospRegisterClass(MCInst &Inst, unsigned RegNo,
1332 uint64_t Address,
1333 const MCDisassembler *Decoder) {
1334 DecodeStatus S = MCDisassembler::Success;
1335
1336 if (RegNo == 13)
1337 S = MCDisassembler::SoftFail;
1338
1339 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1340
1341 return S;
1342}
1343
1344static DecodeStatus
1345DecodeGPRwithAPSRRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1346 const MCDisassembler *Decoder) {
1347 DecodeStatus S = MCDisassembler::Success;
1348
1349 if (RegNo == 15)
1350 {
1351 Inst.addOperand(MCOperand::createReg(ARM::APSR_NZCV));
1352 return MCDisassembler::Success;
1353 }
1354
1355 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1356 return S;
1357}
1358
1359static DecodeStatus
1360DecodeGPRwithZRRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1361 const MCDisassembler *Decoder) {
1362 DecodeStatus S = MCDisassembler::Success;
1363
1364 if (RegNo == 15)
1365 {
1366 Inst.addOperand(MCOperand::createReg(ARM::ZR));
1367 return MCDisassembler::Success;
1368 }
1369
1370 if (RegNo == 13)
1371 Check(S, MCDisassembler::SoftFail);
1372
1373 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1374 return S;
1375}
1376
1377static DecodeStatus
1378DecodeGPRwithZRnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1379 const MCDisassembler *Decoder) {
1380 DecodeStatus S = MCDisassembler::Success;
1381 if (RegNo == 13)
1382 return MCDisassembler::Fail;
1383 Check(S, DecodeGPRwithZRRegisterClass(Inst, RegNo, Address, Decoder));
1384 return S;
1385}
1386
1387static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1388 uint64_t Address,
1389 const MCDisassembler *Decoder) {
1390 if (RegNo > 7)
1391 return MCDisassembler::Fail;
1392 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder);
1393}
1394
1395static const uint16_t GPRPairDecoderTable[] = {
1396 ARM::R0_R1, ARM::R2_R3, ARM::R4_R5, ARM::R6_R7,
1397 ARM::R8_R9, ARM::R10_R11, ARM::R12_SP
1398};
1399
1400static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
1401 uint64_t Address,
1402 const MCDisassembler *Decoder) {
1403 DecodeStatus S = MCDisassembler::Success;
1404
1405 // According to the Arm ARM RegNo = 14 is undefined, but we return fail
1406 // rather than SoftFail as there is no GPRPair table entry for index 7.
1407 if (RegNo > 13)
1408 return MCDisassembler::Fail;
1409
1410 if (RegNo & 1)
1411 S = MCDisassembler::SoftFail;
1412
1413 unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
1414 Inst.addOperand(MCOperand::createReg(RegisterPair));
1415 return S;
1416}
1417
1418static DecodeStatus
1419DecodeGPRPairnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1420 const MCDisassembler *Decoder) {
1421 if (RegNo > 13)
1422 return MCDisassembler::Fail;
1423
1424 unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
1425 Inst.addOperand(MCOperand::createReg(RegisterPair));
1426
1427 if ((RegNo & 1) || RegNo > 10)
1428 return MCDisassembler::SoftFail;
1429 return MCDisassembler::Success;
1430}
1431
1432static DecodeStatus DecodeGPRspRegisterClass(MCInst &Inst, unsigned RegNo,
1433 uint64_t Address,
1434 const MCDisassembler *Decoder) {
1435 if (RegNo != 13)
1436 return MCDisassembler::Fail;
1437
1438 unsigned Register = GPRDecoderTable[RegNo];
1439 Inst.addOperand(MCOperand::createReg(Register));
1440 return MCDisassembler::Success;
1441}
1442
1443static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1444 uint64_t Address,
1445 const MCDisassembler *Decoder) {
1446 unsigned Register = 0;
1447 switch (RegNo) {
1448 case 0:
1449 Register = ARM::R0;
1450 break;
1451 case 1:
1452 Register = ARM::R1;
1453 break;
1454 case 2:
1455 Register = ARM::R2;
1456 break;
1457 case 3:
1458 Register = ARM::R3;
1459 break;
1460 case 9:
1461 Register = ARM::R9;
1462 break;
1463 case 12:
1464 Register = ARM::R12;
1465 break;
1466 default:
1467 return MCDisassembler::Fail;
1468 }
1469
1470 Inst.addOperand(MCOperand::createReg(Register));
1471 return MCDisassembler::Success;
1472}
1473
1474static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1475 uint64_t Address,
1476 const MCDisassembler *Decoder) {
1477 DecodeStatus S = MCDisassembler::Success;
1478
1479 const FeatureBitset &featureBits =
1480 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1481
1482 if ((RegNo == 13 && !featureBits[ARM::HasV8Ops]) || RegNo == 15)
1483 S = MCDisassembler::SoftFail;
1484
1485 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1486 return S;
1487}
1488
1489static const uint16_t SPRDecoderTable[] = {
1490 ARM::S0, ARM::S1, ARM::S2, ARM::S3,
1491 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
1492 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
1493 ARM::S12, ARM::S13, ARM::S14, ARM::S15,
1494 ARM::S16, ARM::S17, ARM::S18, ARM::S19,
1495 ARM::S20, ARM::S21, ARM::S22, ARM::S23,
1496 ARM::S24, ARM::S25, ARM::S26, ARM::S27,
1497 ARM::S28, ARM::S29, ARM::S30, ARM::S31
1498};
1499
1500static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
1501 uint64_t Address,
1502 const MCDisassembler *Decoder) {
1503 if (RegNo > 31)
1504 return MCDisassembler::Fail;
1505
1506 unsigned Register = SPRDecoderTable[RegNo];
1507 Inst.addOperand(MCOperand::createReg(Register));
1508 return MCDisassembler::Success;
1509}
1510
1511static DecodeStatus DecodeHPRRegisterClass(MCInst &Inst, unsigned RegNo,
1512 uint64_t Address,
1513 const MCDisassembler *Decoder) {
1514 return DecodeSPRRegisterClass(Inst, RegNo, Address, Decoder);
1515}
1516
1517static const uint16_t DPRDecoderTable[] = {
1518 ARM::D0, ARM::D1, ARM::D2, ARM::D3,
1519 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
1520 ARM::D8, ARM::D9, ARM::D10, ARM::D11,
1521 ARM::D12, ARM::D13, ARM::D14, ARM::D15,
1522 ARM::D16, ARM::D17, ARM::D18, ARM::D19,
1523 ARM::D20, ARM::D21, ARM::D22, ARM::D23,
1524 ARM::D24, ARM::D25, ARM::D26, ARM::D27,
1525 ARM::D28, ARM::D29, ARM::D30, ARM::D31
1526};
1527
1528static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
1529 uint64_t Address,
1530 const MCDisassembler *Decoder) {
1531 const FeatureBitset &featureBits =
1532 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1533
1534 bool hasD32 = featureBits[ARM::FeatureD32];
1535
1536 if (RegNo > 31 || (!hasD32 && RegNo > 15))
1537 return MCDisassembler::Fail;
1538
1539 unsigned Register = DPRDecoderTable[RegNo];
1540 Inst.addOperand(MCOperand::createReg(Register));
1541 return MCDisassembler::Success;
1542}
1543
1544static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
1545 uint64_t Address,
1546 const MCDisassembler *Decoder) {
1547 if (RegNo > 7)
1548 return MCDisassembler::Fail;
1549 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1550}
1551
1552static DecodeStatus DecodeSPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
1553 uint64_t Address,
1554 const MCDisassembler *Decoder) {
1555 if (RegNo > 15)
1556 return MCDisassembler::Fail;
1557 return DecodeSPRRegisterClass(Inst, RegNo, Address, Decoder);
1558}
1559
1560static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo,
1561 uint64_t Address,
1562 const MCDisassembler *Decoder) {
1563 if (RegNo > 15)
1564 return MCDisassembler::Fail;
1565 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1566}
1567
1568static const uint16_t QPRDecoderTable[] = {
1569 ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3,
1570 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7,
1571 ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11,
1572 ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15
1573};
1574
1575static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
1576 uint64_t Address,
1577 const MCDisassembler *Decoder) {
1578 if (RegNo > 31 || (RegNo & 1) != 0)
1579 return MCDisassembler::Fail;
1580 RegNo >>= 1;
1581
1582 unsigned Register = QPRDecoderTable[RegNo];
1583 Inst.addOperand(MCOperand::createReg(Register));
1584 return MCDisassembler::Success;
1585}
1586
1587static const uint16_t DPairDecoderTable[] = {
1588 ARM::Q0, ARM::D1_D2, ARM::Q1, ARM::D3_D4, ARM::Q2, ARM::D5_D6,
1589 ARM::Q3, ARM::D7_D8, ARM::Q4, ARM::D9_D10, ARM::Q5, ARM::D11_D12,
1590 ARM::Q6, ARM::D13_D14, ARM::Q7, ARM::D15_D16, ARM::Q8, ARM::D17_D18,
1591 ARM::Q9, ARM::D19_D20, ARM::Q10, ARM::D21_D22, ARM::Q11, ARM::D23_D24,
1592 ARM::Q12, ARM::D25_D26, ARM::Q13, ARM::D27_D28, ARM::Q14, ARM::D29_D30,
1593 ARM::Q15
1594};
1595
1596static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
1597 uint64_t Address,
1598 const MCDisassembler *Decoder) {
1599 if (RegNo > 30)
1600 return MCDisassembler::Fail;
1601
1602 unsigned Register = DPairDecoderTable[RegNo];
1603 Inst.addOperand(MCOperand::createReg(Register));
1604 return MCDisassembler::Success;
1605}
1606
1607static const uint16_t DPairSpacedDecoderTable[] = {
1608 ARM::D0_D2, ARM::D1_D3, ARM::D2_D4, ARM::D3_D5,
1609 ARM::D4_D6, ARM::D5_D7, ARM::D6_D8, ARM::D7_D9,
1610 ARM::D8_D10, ARM::D9_D11, ARM::D10_D12, ARM::D11_D13,
1611 ARM::D12_D14, ARM::D13_D15, ARM::D14_D16, ARM::D15_D17,
1612 ARM::D16_D18, ARM::D17_D19, ARM::D18_D20, ARM::D19_D21,
1613 ARM::D20_D22, ARM::D21_D23, ARM::D22_D24, ARM::D23_D25,
1614 ARM::D24_D26, ARM::D25_D27, ARM::D26_D28, ARM::D27_D29,
1615 ARM::D28_D30, ARM::D29_D31
1616};
1617
1618static DecodeStatus
1619DecodeDPairSpacedRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1620 const MCDisassembler *Decoder) {
1621 if (RegNo > 29)
1622 return MCDisassembler::Fail;
1623
1624 unsigned Register = DPairSpacedDecoderTable[RegNo];
1625 Inst.addOperand(MCOperand::createReg(Register));
1626 return MCDisassembler::Success;
1627}
1628
1629static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
1630 uint64_t Address,
1631 const MCDisassembler *Decoder) {
1632 DecodeStatus S = MCDisassembler::Success;
1633 if (Val == 0xF) return MCDisassembler::Fail;
1634 // AL predicate is not allowed on Thumb1 branches.
1635 if (Inst.getOpcode() == ARM::tBcc && Val == 0xE)
1636 return MCDisassembler::Fail;
1637 const MCInstrInfo *MCII =
1638 static_cast<const ARMDisassembler *>(Decoder)->MCII.get();
1639 if (Val != ARMCC::AL && !MCII->get(Inst.getOpcode()).isPredicable())
1640 Check(S, MCDisassembler::SoftFail);
1641 Inst.addOperand(MCOperand::createImm(Val));
1642 if (Val == ARMCC::AL) {
1643 Inst.addOperand(MCOperand::createReg(0));
1644 } else
1645 Inst.addOperand(MCOperand::createReg(ARM::CPSR));
1646 return S;
1647}
1648
1649static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
1650 uint64_t Address,
1651 const MCDisassembler *Decoder) {
1652 if (Val)
1653 Inst.addOperand(MCOperand::createReg(ARM::CPSR));
1654 else
1655 Inst.addOperand(MCOperand::createReg(0));
1656 return MCDisassembler::Success;
1657}
1658
1659static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Val,
1660 uint64_t Address,
1661 const MCDisassembler *Decoder) {
1662 DecodeStatus S = MCDisassembler::Success;
1663
1664 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1665 unsigned type = fieldFromInstruction(Val, 5, 2);
1666 unsigned imm = fieldFromInstruction(Val, 7, 5);
1667
1668 // Register-immediate
1669 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
1670 return MCDisassembler::Fail;
1671
1672 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1673 switch (type) {
1674 case 0:
1675 Shift = ARM_AM::lsl;
1676 break;
1677 case 1:
1678 Shift = ARM_AM::lsr;
1679 break;
1680 case 2:
1681 Shift = ARM_AM::asr;
1682 break;
1683 case 3:
1684 Shift = ARM_AM::ror;
1685 break;
1686 }
1687
1688 if (Shift == ARM_AM::ror && imm == 0)
1689 Shift = ARM_AM::rrx;
1690
1691 unsigned Op = Shift | (imm << 3);
1692 Inst.addOperand(MCOperand::createImm(Op));
1693
1694 return S;
1695}
1696
1697static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Val,
1698 uint64_t Address,
1699 const MCDisassembler *Decoder) {
1700 DecodeStatus S = MCDisassembler::Success;
1701
1702 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1703 unsigned type = fieldFromInstruction(Val, 5, 2);
1704 unsigned Rs = fieldFromInstruction(Val, 8, 4);
1705
1706 // Register-register
1707 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1708 return MCDisassembler::Fail;
1709 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder)))
1710 return MCDisassembler::Fail;
1711
1712 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1713 switch (type) {
1714 case 0:
1715 Shift = ARM_AM::lsl;
1716 break;
1717 case 1:
1718 Shift = ARM_AM::lsr;
1719 break;
1720 case 2:
1721 Shift = ARM_AM::asr;
1722 break;
1723 case 3:
1724 Shift = ARM_AM::ror;
1725 break;
1726 }
1727
1728 Inst.addOperand(MCOperand::createImm(Shift));
1729
1730 return S;
1731}
1732
1733static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
1734 uint64_t Address,
1735 const MCDisassembler *Decoder) {
1736 DecodeStatus S = MCDisassembler::Success;
1737
1738 bool NeedDisjointWriteback = false;
1739 unsigned WritebackReg = 0;
1740 bool CLRM = false;
1741 switch (Inst.getOpcode()) {
1742 default:
1743 break;
1744 case ARM::LDMIA_UPD:
1745 case ARM::LDMDB_UPD:
1746 case ARM::LDMIB_UPD:
1747 case ARM::LDMDA_UPD:
1748 case ARM::t2LDMIA_UPD:
1749 case ARM::t2LDMDB_UPD:
1750 case ARM::t2STMIA_UPD:
1751 case ARM::t2STMDB_UPD:
1752 NeedDisjointWriteback = true;
1753 WritebackReg = Inst.getOperand(0).getReg();
1754 break;
1755 case ARM::t2CLRM:
1756 CLRM = true;
1757 break;
1758 }
1759
1760 // Empty register lists are not allowed.
1761 if (Val == 0) return MCDisassembler::Fail;
1762 for (unsigned i = 0; i < 16; ++i) {
1763 if (Val & (1 << i)) {
1764 if (CLRM) {
1765 if (!Check(S, DecodeCLRMGPRRegisterClass(Inst, i, Address, Decoder))) {
1766 return MCDisassembler::Fail;
1767 }
1768 } else {
1769 if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder)))
1770 return MCDisassembler::Fail;
1771 // Writeback not allowed if Rn is in the target list.
1772 if (NeedDisjointWriteback && WritebackReg == Inst.end()[-1].getReg())
1773 Check(S, MCDisassembler::SoftFail);
1774 }
1775 }
1776 }
1777
1778 return S;
1779}
1780
1781static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
1782 uint64_t Address,
1783 const MCDisassembler *Decoder) {
1784 DecodeStatus S = MCDisassembler::Success;
1785
1786 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1787 unsigned regs = fieldFromInstruction(Val, 0, 8);
1788
1789 // In case of unpredictable encoding, tweak the operands.
1790 if (regs == 0 || (Vd + regs) > 32) {
1791 regs = Vd + regs > 32 ? 32 - Vd : regs;
1792 regs = std::max( 1u, regs);
1793 S = MCDisassembler::SoftFail;
1794 }
1795
1796 if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder)))
1797 return MCDisassembler::Fail;
1798 for (unsigned i = 0; i < (regs - 1); ++i) {
1799 if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1800 return MCDisassembler::Fail;
1801 }
1802
1803 return S;
1804}
1805
1806static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
1807 uint64_t Address,
1808 const MCDisassembler *Decoder) {
1809 DecodeStatus S = MCDisassembler::Success;
1810
1811 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1812 unsigned regs = fieldFromInstruction(Val, 1, 7);
1813
1814 // In case of unpredictable encoding, tweak the operands.
1815 if (regs == 0 || regs > 16 || (Vd + regs) > 32) {
1816 regs = Vd + regs > 32 ? 32 - Vd : regs;
1817 regs = std::max( 1u, regs);
1818 regs = std::min(16u, regs);
1819 S = MCDisassembler::SoftFail;
1820 }
1821
1822 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
1823 return MCDisassembler::Fail;
1824 for (unsigned i = 0; i < (regs - 1); ++i) {
1825 if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1826 return MCDisassembler::Fail;
1827 }
1828
1829 return S;
1830}
1831
1832static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Val,
1833 uint64_t Address,
1834 const MCDisassembler *Decoder) {
1835 // This operand encodes a mask of contiguous zeros between a specified MSB
1836 // and LSB. To decode it, we create the mask of all bits MSB-and-lower,
1837 // the mask of all bits LSB-and-lower, and then xor them to create
1838 // the mask of that's all ones on [msb, lsb]. Finally we not it to
1839 // create the final mask.
1840 unsigned msb = fieldFromInstruction(Val, 5, 5);
1841 unsigned lsb = fieldFromInstruction(Val, 0, 5);
1842
1843 DecodeStatus S = MCDisassembler::Success;
1844 if (lsb > msb) {
1845 Check(S, MCDisassembler::SoftFail);
1846 // The check above will cause the warning for the "potentially undefined
1847 // instruction encoding" but we can't build a bad MCOperand value here
1848 // with a lsb > msb or else printing the MCInst will cause a crash.
1849 lsb = msb;
1850 }
1851
1852 uint32_t msb_mask = 0xFFFFFFFF;
1853 if (msb != 31) msb_mask = (1U << (msb+1)) - 1;
1854 uint32_t lsb_mask = (1U << lsb) - 1;
1855
1856 Inst.addOperand(MCOperand::createImm(~(msb_mask ^ lsb_mask)));
1857 return S;
1858}
1859
1860static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
1861 uint64_t Address,
1862 const MCDisassembler *Decoder) {
1863 DecodeStatus S = MCDisassembler::Success;
1864
1865 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1866 unsigned CRd = fieldFromInstruction(Insn, 12, 4);
1867 unsigned coproc = fieldFromInstruction(Insn, 8, 4);
1868 unsigned imm = fieldFromInstruction(Insn, 0, 8);
1869 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1870 unsigned U = fieldFromInstruction(Insn, 23, 1);
1871 const FeatureBitset &featureBits =
1872 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1873
1874 switch (Inst.getOpcode()) {
1875 case ARM::LDC_OFFSET:
1876 case ARM::LDC_PRE:
1877 case ARM::LDC_POST:
1878 case ARM::LDC_OPTION:
1879 case ARM::LDCL_OFFSET:
1880 case ARM::LDCL_PRE:
1881 case ARM::LDCL_POST:
1882 case ARM::LDCL_OPTION:
1883 case ARM::STC_OFFSET:
1884 case ARM::STC_PRE:
1885 case ARM::STC_POST:
1886 case ARM::STC_OPTION:
1887 case ARM::STCL_OFFSET:
1888 case ARM::STCL_PRE:
1889 case ARM::STCL_POST:
1890 case ARM::STCL_OPTION:
1891 case ARM::t2LDC_OFFSET:
1892 case ARM::t2LDC_PRE:
1893 case ARM::t2LDC_POST:
1894 case ARM::t2LDC_OPTION:
1895 case ARM::t2LDCL_OFFSET:
1896 case ARM::t2LDCL_PRE:
1897 case ARM::t2LDCL_POST:
1898 case ARM::t2LDCL_OPTION:
1899 case ARM::t2STC_OFFSET:
1900 case ARM::t2STC_PRE:
1901 case ARM::t2STC_POST:
1902 case ARM::t2STC_OPTION:
1903 case ARM::t2STCL_OFFSET:
1904 case ARM::t2STCL_PRE:
1905 case ARM::t2STCL_POST:
1906 case ARM::t2STCL_OPTION:
1907 case ARM::t2LDC2_OFFSET:
1908 case ARM::t2LDC2L_OFFSET:
1909 case ARM::t2LDC2_PRE:
1910 case ARM::t2LDC2L_PRE:
1911 case ARM::t2STC2_OFFSET:
1912 case ARM::t2STC2L_OFFSET:
1913 case ARM::t2STC2_PRE:
1914 case ARM::t2STC2L_PRE:
1915 case ARM::LDC2_OFFSET:
1916 case ARM::LDC2L_OFFSET:
1917 case ARM::LDC2_PRE:
1918 case ARM::LDC2L_PRE:
1919 case ARM::STC2_OFFSET:
1920 case ARM::STC2L_OFFSET:
1921 case ARM::STC2_PRE:
1922 case ARM::STC2L_PRE:
1923 case ARM::t2LDC2_OPTION:
1924 case ARM::t2STC2_OPTION:
1925 case ARM::t2LDC2_POST:
1926 case ARM::t2LDC2L_POST:
1927 case ARM::t2STC2_POST:
1928 case ARM::t2STC2L_POST:
1929 case ARM::LDC2_POST:
1930 case ARM::LDC2L_POST:
1931 case ARM::STC2_POST:
1932 case ARM::STC2L_POST:
1933 if (coproc == 0xA || coproc == 0xB ||
1934 (featureBits[ARM::HasV8_1MMainlineOps] &&
1935 (coproc == 0x8 || coproc == 0x9 || coproc == 0xA || coproc == 0xB ||
1936 coproc == 0xE || coproc == 0xF)))
1937 return MCDisassembler::Fail;
1938 break;
1939 default:
1940 break;
1941 }
1942
1943 if (featureBits[ARM::HasV8Ops] && (coproc != 14))
1944 return MCDisassembler::Fail;
1945
1946 Inst.addOperand(MCOperand::createImm(coproc));
1947 Inst.addOperand(MCOperand::createImm(CRd));
1948 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1949 return MCDisassembler::Fail;
1950
1951 switch (Inst.getOpcode()) {
1952 case ARM::t2LDC2_OFFSET:
1953 case ARM::t2LDC2L_OFFSET:
1954 case ARM::t2LDC2_PRE:
1955 case ARM::t2LDC2L_PRE:
1956 case ARM::t2STC2_OFFSET:
1957 case ARM::t2STC2L_OFFSET:
1958 case ARM::t2STC2_PRE:
1959 case ARM::t2STC2L_PRE:
1960 case ARM::LDC2_OFFSET:
1961 case ARM::LDC2L_OFFSET:
1962 case ARM::LDC2_PRE:
1963 case ARM::LDC2L_PRE:
1964 case ARM::STC2_OFFSET:
1965 case ARM::STC2L_OFFSET:
1966 case ARM::STC2_PRE:
1967 case ARM::STC2L_PRE:
1968 case ARM::t2LDC_OFFSET:
1969 case ARM::t2LDCL_OFFSET:
1970 case ARM::t2LDC_PRE:
1971 case ARM::t2LDCL_PRE:
1972 case ARM::t2STC_OFFSET:
1973 case ARM::t2STCL_OFFSET:
1974 case ARM::t2STC_PRE:
1975 case ARM::t2STCL_PRE:
1976 case ARM::LDC_OFFSET:
1977 case ARM::LDCL_OFFSET:
1978 case ARM::LDC_PRE:
1979 case ARM::LDCL_PRE:
1980 case ARM::STC_OFFSET:
1981 case ARM::STCL_OFFSET:
1982 case ARM::STC_PRE:
1983 case ARM::STCL_PRE:
1984 imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm);
1985 Inst.addOperand(MCOperand::createImm(imm));
1986 break;
1987 case ARM::t2LDC2_POST:
1988 case ARM::t2LDC2L_POST:
1989 case ARM::t2STC2_POST:
1990 case ARM::t2STC2L_POST:
1991 case ARM::LDC2_POST:
1992 case ARM::LDC2L_POST:
1993 case ARM::STC2_POST:
1994 case ARM::STC2L_POST:
1995 case ARM::t2LDC_POST:
1996 case ARM::t2LDCL_POST:
1997 case ARM::t2STC_POST:
1998 case ARM::t2STCL_POST:
1999 case ARM::LDC_POST:
2000 case ARM::LDCL_POST:
2001 case ARM::STC_POST:
2002 case ARM::STCL_POST:
2003 imm |= U << 8;
2004 [[fallthrough]];
2005 default:
2006 // The 'option' variant doesn't encode 'U' in the immediate since
2007 // the immediate is unsigned [0,255].
2008 Inst.addOperand(MCOperand::createImm(imm));
2009 break;
2010 }
2011
2012 switch (Inst.getOpcode()) {
2013 case ARM::LDC_OFFSET:
2014 case ARM::LDC_PRE:
2015 case ARM::LDC_POST:
2016 case ARM::LDC_OPTION:
2017 case ARM::LDCL_OFFSET:
2018 case ARM::LDCL_PRE:
2019 case ARM::LDCL_POST:
2020 case ARM::LDCL_OPTION:
2021 case ARM::STC_OFFSET:
2022 case ARM::STC_PRE:
2023 case ARM::STC_POST:
2024 case ARM::STC_OPTION:
2025 case ARM::STCL_OFFSET:
2026 case ARM::STCL_PRE:
2027 case ARM::STCL_POST:
2028 case ARM::STCL_OPTION:
2029 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2030 return MCDisassembler::Fail;
2031 break;
2032 default:
2033 break;
2034 }
2035
2036 return S;
2037}
2038
2039static DecodeStatus
2040DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
2041 const MCDisassembler *Decoder) {
2042 DecodeStatus S = MCDisassembler::Success;
2043
2044 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2045 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
2046 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2047 unsigned imm = fieldFromInstruction(Insn, 0, 12);
2048 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2049 unsigned reg = fieldFromInstruction(Insn, 25, 1);
2050 unsigned P = fieldFromInstruction(Insn, 24, 1);
2051 unsigned W = fieldFromInstruction(Insn, 21, 1);
2052
2053 // On stores, the writeback operand precedes Rt.
2054 switch (Inst.getOpcode()) {
2055 case ARM::STR_POST_IMM:
2056 case ARM::STR_POST_REG:
2057 case ARM::STRB_POST_IMM:
2058 case ARM::STRB_POST_REG:
2059 case ARM::STRT_POST_REG:
2060 case ARM::STRT_POST_IMM:
2061 case ARM::STRBT_POST_REG:
2062 case ARM::STRBT_POST_IMM:
2063 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2064 return MCDisassembler::Fail;
2065 break;
2066 default:
2067 break;
2068 }
2069
2070 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
2071 return MCDisassembler::Fail;
2072
2073 // On loads, the writeback operand comes after Rt.
2074 switch (Inst.getOpcode()) {
2075 case ARM::LDR_POST_IMM:
2076 case ARM::LDR_POST_REG:
2077 case ARM::LDRB_POST_IMM:
2078 case ARM::LDRB_POST_REG:
2079 case ARM::LDRBT_POST_REG:
2080 case ARM::LDRBT_POST_IMM:
2081 case ARM::LDRT_POST_REG:
2082 case ARM::LDRT_POST_IMM:
2083 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2084 return MCDisassembler::Fail;
2085 break;
2086 default:
2087 break;
2088 }
2089
2090 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2091 return MCDisassembler::Fail;
2092
2093 ARM_AM::AddrOpc Op = ARM_AM::add;
2094 if (!fieldFromInstruction(Insn, 23, 1))
2095 Op = ARM_AM::sub;
2096
2097 bool writeback = (P == 0) || (W == 1);
2098 unsigned idx_mode = 0;
2099 if (P && writeback)
2100 idx_mode = ARMII::IndexModePre;
2101 else if (!P && writeback)
2102 idx_mode = ARMII::IndexModePost;
2103
2104 if (writeback && (Rn == 15 || Rn == Rt))
2105 S = MCDisassembler::SoftFail; // UNPREDICTABLE
2106
2107 if (reg) {
2108 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2109 return MCDisassembler::Fail;
2110 ARM_AM::ShiftOpc Opc = ARM_AM::lsl;
2111 switch( fieldFromInstruction(Insn, 5, 2)) {
2112 case 0:
2113 Opc = ARM_AM::lsl;
2114 break;
2115 case 1:
2116 Opc = ARM_AM::lsr;
2117 break;
2118 case 2:
2119 Opc = ARM_AM::asr;
2120 break;
2121 case 3:
2122 Opc = ARM_AM::ror;
2123 break;
2124 default:
2125 return MCDisassembler::Fail;
2126 }
2127 unsigned amt = fieldFromInstruction(Insn, 7, 5);
2128 if (Opc == ARM_AM::ror && amt == 0)
2129 Opc = ARM_AM::rrx;
2130 unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode);
2131
2132 Inst.addOperand(MCOperand::createImm(imm));
2133 } else {
2134 Inst.addOperand(MCOperand::createReg(0));
2135 unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode);
2136 Inst.addOperand(MCOperand::createImm(tmp));
2137 }
2138
2139 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2140 return MCDisassembler::Fail;
2141
2142 return S;
2143}
2144
2145static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Val,
2146 uint64_t Address,
2147 const MCDisassembler *Decoder) {
2148 DecodeStatus S = MCDisassembler::Success;
2149
2150 unsigned Rn = fieldFromInstruction(Val, 13, 4);
2151 unsigned Rm = fieldFromInstruction(Val, 0, 4);
2152 unsigned type = fieldFromInstruction(Val, 5, 2);
2153 unsigned imm = fieldFromInstruction(Val, 7, 5);
2154 unsigned U = fieldFromInstruction(Val, 12, 1);
2155
2156 ARM_AM::ShiftOpc ShOp = ARM_AM::lsl;
2157 switch (type) {
2158 case 0:
2159 ShOp = ARM_AM::lsl;
2160 break;
2161 case 1:
2162 ShOp = ARM_AM::lsr;
2163 break;
2164 case 2:
2165 ShOp = ARM_AM::asr;
2166 break;
2167 case 3:
2168 ShOp = ARM_AM::ror;
2169 break;
2170 }
2171
2172 if (ShOp == ARM_AM::ror && imm == 0)
2173 ShOp = ARM_AM::rrx;
2174
2175 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2176 return MCDisassembler::Fail;
2177 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2178 return MCDisassembler::Fail;
2179 unsigned shift;
2180 if (U)
2181 shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp);
2182 else
2183 shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp);
2184 Inst.addOperand(MCOperand::createImm(shift));
2185
2186 return S;
2187}
2188
2189static DecodeStatus DecodeTSBInstruction(MCInst &Inst, unsigned Insn,
2190 uint64_t Address,
2191 const MCDisassembler *Decoder) {
2192 if (Inst.getOpcode() != ARM::TSB && Inst.getOpcode() != ARM::t2TSB)
2193 return MCDisassembler::Fail;
2194
2195 // The "csync" operand is not encoded into the "tsb" instruction (as this is
2196 // the only available operand), but LLVM expects the instruction to have one
2197 // operand, so we need to add the csync when decoding.
2198 Inst.addOperand(MCOperand::createImm(ARM_TSB::CSYNC));
2199 return MCDisassembler::Success;
2200}
2201
2202static DecodeStatus DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn,
2203 uint64_t Address,
2204 const MCDisassembler *Decoder) {
2205 DecodeStatus S = MCDisassembler::Success;
2206
2207 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
2208 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2209 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2210 unsigned type = fieldFromInstruction(Insn, 22, 1);
2211 unsigned imm = fieldFromInstruction(Insn, 8, 4);
2212 unsigned U = ((~fieldFromInstruction(Insn, 23, 1)) & 1) << 8;
2213 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2214 unsigned W = fieldFromInstruction(Insn, 21, 1);
2215 unsigned P = fieldFromInstruction(Insn, 24, 1);
2216 unsigned Rt2 = Rt + 1;
2217
2218 bool writeback = (W == 1) | (P == 0);
2219
2220 // For {LD,ST}RD, Rt must be even, else undefined.
2221 switch (Inst.getOpcode()) {
2222 case ARM::STRD:
2223 case ARM::STRD_PRE:
2224 case ARM::STRD_POST:
2225 case ARM::LDRD:
2226 case ARM::LDRD_PRE:
2227 case ARM::LDRD_POST:
2228 if (Rt & 0x1) S = MCDisassembler::SoftFail;
2229 break;
2230 default:
2231 break;
2232 }
2233 switch (Inst.getOpcode()) {
2234 case ARM::STRD:
2235 case ARM::STRD_PRE:
2236 case ARM::STRD_POST:
2237 if (P == 0 && W == 1)
2238 S = MCDisassembler::SoftFail;
2239
2240 if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2))
2241 S = MCDisassembler::SoftFail;
2242 if (type && Rm == 15)
2243 S = MCDisassembler::SoftFail;
2244 if (Rt2 == 15)
2245 S = MCDisassembler::SoftFail;
2246 if (!type && fieldFromInstruction(Insn, 8, 4))
2247 S = MCDisassembler::SoftFail;
2248 break;
2249 case ARM::STRH:
2250 case ARM::STRH_PRE:
2251 case ARM::STRH_POST:
2252 if (Rt == 15)
2253 S = MCDisassembler::SoftFail;
2254 if (writeback && (Rn == 15 || Rn == Rt))
2255 S = MCDisassembler::SoftFail;
2256 if (!type && Rm == 15)
2257 S = MCDisassembler::SoftFail;
2258 break;
2259 case ARM::LDRD:
2260 case ARM::LDRD_PRE:
2261 case ARM::LDRD_POST:
2262 if (type && Rn == 15) {
2263 if (Rt2 == 15)
2264 S = MCDisassembler::SoftFail;
2265 break;
2266 }
2267 if (P == 0 && W == 1)
2268 S = MCDisassembler::SoftFail;
2269 if (!type && (Rt2 == 15 || Rm == 15 || Rm == Rt || Rm == Rt2))
2270 S = MCDisassembler::SoftFail;
2271 if (!type && writeback && Rn == 15)
2272 S = MCDisassembler::SoftFail;
2273 if (writeback && (Rn == Rt || Rn == Rt2))
2274 S = MCDisassembler::SoftFail;
2275 break;
2276 case ARM::LDRH:
2277 case ARM::LDRH_PRE:
2278 case ARM::LDRH_POST:
2279 if (type && Rn == 15) {
2280 if (Rt == 15)
2281 S = MCDisassembler::SoftFail;
2282 break;
2283 }
2284 if (Rt == 15)
2285 S = MCDisassembler::SoftFail;
2286 if (!type && Rm == 15)
2287 S = MCDisassembler::SoftFail;
2288 if (!type && writeback && (Rn == 15 || Rn == Rt))
2289 S = MCDisassembler::SoftFail;
2290 break;
2291 case ARM::LDRSH:
2292 case ARM::LDRSH_PRE:
2293 case ARM::LDRSH_POST:
2294 case ARM::LDRSB:
2295 case ARM::LDRSB_PRE:
2296 case ARM::LDRSB_POST:
2297 if (type && Rn == 15) {
2298 if (Rt == 15)
2299 S = MCDisassembler::SoftFail;
2300 break;
2301 }
2302 if (type && (Rt == 15 || (writeback && Rn == Rt)))
2303 S = MCDisassembler::SoftFail;
2304 if (!type && (Rt == 15 || Rm == 15))
2305 S = MCDisassembler::SoftFail;
2306 if (!type && writeback && (Rn == 15 || Rn == Rt))
2307 S = MCDisassembler::SoftFail;
2308 break;
2309 default:
2310 break;
2311 }
2312
2313 if (writeback) { // Writeback
2314 if (P)
2315 U |= ARMII::IndexModePre << 9;
2316 else
2317 U |= ARMII::IndexModePost << 9;
2318
2319 // On stores, the writeback operand precedes Rt.
2320 switch (Inst.getOpcode()) {
2321 case ARM::STRD:
2322 case ARM::STRD_PRE:
2323 case ARM::STRD_POST:
2324 case ARM::STRH:
2325 case ARM::STRH_PRE:
2326 case ARM::STRH_POST:
2327 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2328 return MCDisassembler::Fail;
2329 break;
2330 default:
2331 break;
2332 }
2333 }
2334
2335 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
2336 return MCDisassembler::Fail;
2337 switch (Inst.getOpcode()) {
2338 case ARM::STRD:
2339 case ARM::STRD_PRE:
2340 case ARM::STRD_POST:
2341 case ARM::LDRD:
2342 case ARM::LDRD_PRE:
2343 case ARM::LDRD_POST:
2344 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder)))
2345 return MCDisassembler::Fail;
2346 break;
2347 default:
2348 break;
2349 }
2350
2351 if (writeback) {
2352 // On loads, the writeback operand comes after Rt.
2353 switch (Inst.getOpcode()) {
2354 case ARM::LDRD:
2355 case ARM::LDRD_PRE:
2356 case ARM::LDRD_POST:
2357 case ARM::LDRH:
2358 case ARM::LDRH_PRE:
2359 case ARM::LDRH_POST:
2360 case ARM::LDRSH:
2361 case ARM::LDRSH_PRE:
2362 case ARM::LDRSH_POST:
2363 case ARM::LDRSB:
2364 case ARM::LDRSB_PRE:
2365 case ARM::LDRSB_POST:
2366 case ARM::LDRHTr:
2367 case ARM::LDRSBTr:
2368 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2369 return MCDisassembler::Fail;
2370 break;
2371 default:
2372 break;
2373 }
2374 }
2375
2376 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2377 return MCDisassembler::Fail;
2378
2379 if (type) {
2380 Inst.addOperand(MCOperand::createReg(0));
2381 Inst.addOperand(MCOperand::createImm(U | (imm << 4) | Rm));
2382 } else {
2383 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2384 return MCDisassembler::Fail;
2385 Inst.addOperand(MCOperand::createImm(U));
2386 }
2387
2388 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2389 return MCDisassembler::Fail;
2390
2391 return S;
2392}
2393
2394static DecodeStatus DecodeRFEInstruction(MCInst &Inst, unsigned Insn,
2395 uint64_t Address,
2396 const MCDisassembler *Decoder) {
2397 DecodeStatus S = MCDisassembler::Success;
2398
2399 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2400 unsigned mode = fieldFromInstruction(Insn, 23, 2);
2401
2402 switch (mode) {
2403 case 0:
2404 mode = ARM_AM::da;
2405 break;
2406 case 1:
2407 mode = ARM_AM::ia;
2408 break;
2409 case 2:
2410 mode = ARM_AM::db;
2411 break;
2412 case 3:
2413 mode = ARM_AM::ib;
2414 break;
2415 }
2416
2417 Inst.addOperand(MCOperand::createImm(mode));
2418 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2419 return MCDisassembler::Fail;
2420
2421 return S;
2422}
2423
2424static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
2425 uint64_t Address,
2426 const MCDisassembler *Decoder) {
2427 DecodeStatus S = MCDisassembler::Success;
2428
2429 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2430 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2431 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2432 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2433
2434 if (pred == 0xF)
2435 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2436
2437 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2438 return MCDisassembler::Fail;
2439 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2440 return MCDisassembler::Fail;
2441 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2442 return MCDisassembler::Fail;
2443 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2444 return MCDisassembler::Fail;
2445 return S;
2446}
2447
2448static DecodeStatus
2449DecodeMemMultipleWritebackInstruction(MCInst &Inst, unsigned Insn,
2450 uint64_t Address,
2451 const MCDisassembler *Decoder) {
2452 DecodeStatus S = MCDisassembler::Success;
2453
2454 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2455 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2456 unsigned reglist = fieldFromInstruction(Insn, 0, 16);
2457
2458 if (pred == 0xF) {
2459 // Ambiguous with RFE and SRS
2460 switch (Inst.getOpcode()) {
2461 case ARM::LDMDA:
2462 Inst.setOpcode(ARM::RFEDA);
2463 break;
2464 case ARM::LDMDA_UPD:
2465 Inst.setOpcode(ARM::RFEDA_UPD);
2466 break;
2467 case ARM::LDMDB:
2468 Inst.setOpcode(ARM::RFEDB);
2469 break;
2470 case ARM::LDMDB_UPD:
2471 Inst.setOpcode(ARM::RFEDB_UPD);
2472 break;
2473 case ARM::LDMIA:
2474 Inst.setOpcode(ARM::RFEIA);
2475 break;
2476 case ARM::LDMIA_UPD:
2477 Inst.setOpcode(ARM::RFEIA_UPD);
2478 break;
2479 case ARM::LDMIB:
2480 Inst.setOpcode(ARM::RFEIB);
2481 break;
2482 case ARM::LDMIB_UPD:
2483 Inst.setOpcode(ARM::RFEIB_UPD);
2484 break;
2485 case ARM::STMDA:
2486 Inst.setOpcode(ARM::SRSDA);
2487 break;
2488 case ARM::STMDA_UPD:
2489 Inst.setOpcode(ARM::SRSDA_UPD);
2490 break;
2491 case ARM::STMDB:
2492 Inst.setOpcode(ARM::SRSDB);
2493 break;
2494 case ARM::STMDB_UPD:
2495 Inst.setOpcode(ARM::SRSDB_UPD);
2496 break;
2497 case ARM::STMIA:
2498 Inst.setOpcode(ARM::SRSIA);
2499 break;
2500 case ARM::STMIA_UPD:
2501 Inst.setOpcode(ARM::SRSIA_UPD);
2502 break;
2503 case ARM::STMIB:
2504 Inst.setOpcode(ARM::SRSIB);
2505 break;
2506 case ARM::STMIB_UPD:
2507 Inst.setOpcode(ARM::SRSIB_UPD);
2508 break;
2509 default:
2510 return MCDisassembler::Fail;
2511 }
2512
2513 // For stores (which become SRS's, the only operand is the mode.
2514 if (fieldFromInstruction(Insn, 20, 1) == 0) {
2515 // Check SRS encoding constraints
2516 if (!(fieldFromInstruction(Insn, 22, 1) == 1 &&
2517 fieldFromInstruction(Insn, 20, 1) == 0))
2518 return MCDisassembler::Fail;
2519
2520 Inst.addOperand(
2521 MCOperand::createImm(fieldFromInstruction(Insn, 0, 4)));
2522 return S;
2523 }
2524
2525 return DecodeRFEInstruction(Inst, Insn, Address, Decoder);
2526 }
2527
2528 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2529 return MCDisassembler::Fail;
2530 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2531 return MCDisassembler::Fail; // Tied
2532 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2533 return MCDisassembler::Fail;
2534 if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder)))
2535 return MCDisassembler::Fail;
2536
2537 return S;
2538}
2539
2540// Check for UNPREDICTABLE predicated ESB instruction
2541static DecodeStatus DecodeHINTInstruction(MCInst &Inst, unsigned Insn,
2542 uint64_t Address,
2543 const MCDisassembler *Decoder) {
2544 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2545 unsigned imm8 = fieldFromInstruction(Insn, 0, 8);
2546 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
2547 const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits();
2548
2549 DecodeStatus S = MCDisassembler::Success;
2550
2551 Inst.addOperand(MCOperand::createImm(imm8));
2552
2553 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2554 return MCDisassembler::Fail;
2555
2556 // ESB is unpredictable if pred != AL. Without the RAS extension, it is a NOP,
2557 // so all predicates should be allowed.
2558 if (imm8 == 0x10 && pred != 0xe && ((FeatureBits[ARM::FeatureRAS]) != 0))
2559 S = MCDisassembler::SoftFail;
2560
2561 return S;
2562}
2563
2564static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
2565 uint64_t Address,
2566 const MCDisassembler *Decoder) {
2567 unsigned imod = fieldFromInstruction(Insn, 18, 2);
2568 unsigned M = fieldFromInstruction(Insn, 17, 1);
2569 unsigned iflags = fieldFromInstruction(Insn, 6, 3);
2570 unsigned mode = fieldFromInstruction(Insn, 0, 5);
2571
2572 DecodeStatus S = MCDisassembler::Success;
2573
2574 // This decoder is called from multiple location that do not check
2575 // the full encoding is valid before they do.
2576 if (fieldFromInstruction(Insn, 5, 1) != 0 ||
2577 fieldFromInstruction(Insn, 16, 1) != 0 ||
2578 fieldFromInstruction(Insn, 20, 8) != 0x10)
2579 return MCDisassembler::Fail;
2580
2581 // imod == '01' --> UNPREDICTABLE
2582 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
2583 // return failure here. The '01' imod value is unprintable, so there's
2584 // nothing useful we could do even if we returned UNPREDICTABLE.
2585
2586 if (imod == 1) return MCDisassembler::Fail;
2587
2588 if (imod && M) {
2589 Inst.setOpcode(ARM::CPS3p);
2590 Inst.addOperand(MCOperand::createImm(imod));
2591 Inst.addOperand(MCOperand::createImm(iflags));
2592 Inst.addOperand(MCOperand::createImm(mode));
2593 } else if (imod && !M) {
2594 Inst.setOpcode(ARM::CPS2p);
2595 Inst.addOperand(MCOperand::createImm(imod));
2596 Inst.addOperand(MCOperand::createImm(iflags));
2597 if (mode) S = MCDisassembler::SoftFail;
2598 } else if (!imod && M) {
2599 Inst.setOpcode(ARM::CPS1p);
2600 Inst.addOperand(MCOperand::createImm(mode));
2601 if (iflags) S = MCDisassembler::SoftFail;
2602 } else {
2603 // imod == '00' && M == '0' --> UNPREDICTABLE
2604 Inst.setOpcode(ARM::CPS1p);
2605 Inst.addOperand(MCOperand::createImm(mode));
2606 S = MCDisassembler::SoftFail;
2607 }
2608
2609 return S;
2610}
2611
2612static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
2613 uint64_t Address,
2614 const MCDisassembler *Decoder) {
2615 unsigned imod = fieldFromInstruction(Insn, 9, 2);
2616 unsigned M = fieldFromInstruction(Insn, 8, 1);
2617 unsigned iflags = fieldFromInstruction(Insn, 5, 3);
2618 unsigned mode = fieldFromInstruction(Insn, 0, 5);
2619
2620 DecodeStatus S = MCDisassembler::Success;
2621
2622 // imod == '01' --> UNPREDICTABLE
2623 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
2624 // return failure here. The '01' imod value is unprintable, so there's
2625 // nothing useful we could do even if we returned UNPREDICTABLE.
2626
2627 if (imod == 1) return MCDisassembler::Fail;
2628
2629 if (imod && M) {
2630 Inst.setOpcode(ARM::t2CPS3p);
2631 Inst.addOperand(MCOperand::createImm(imod));
2632 Inst.addOperand(MCOperand::createImm(iflags));
2633 Inst.addOperand(MCOperand::createImm(mode));
2634 } else if (imod && !M) {
2635 Inst.setOpcode(ARM::t2CPS2p);
2636 Inst.addOperand(MCOperand::createImm(imod));
2637 Inst.addOperand(MCOperand::createImm(iflags));
2638 if (mode) S = MCDisassembler::SoftFail;
2639 } else if (!imod && M) {
2640 Inst.setOpcode(ARM::t2CPS1p);
2641 Inst.addOperand(MCOperand::createImm(mode));
2642 if (iflags) S = MCDisassembler::SoftFail;
2643 } else {
2644 // imod == '00' && M == '0' --> this is a HINT instruction
2645 int imm = fieldFromInstruction(Insn, 0, 8);
2646 // HINT are defined only for immediate in [0..4]
2647 if(imm > 4) return MCDisassembler::Fail;
2648 Inst.setOpcode(ARM::t2HINT);
2649 Inst.addOperand(MCOperand::createImm(imm));
2650 }
2651
2652 return S;
2653}
2654
2655static DecodeStatus
2656DecodeT2HintSpaceInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
2657 const MCDisassembler *Decoder) {
2658 unsigned imm = fieldFromInstruction(Insn, 0, 8);
2659
2660 unsigned Opcode = ARM::t2HINT;
2661
2662 if (imm == 0x0D) {
2663 Opcode = ARM::t2PACBTI;
2664 } else if (imm == 0x1D) {
2665 Opcode = ARM::t2PAC;
2666 } else if (imm == 0x2D) {
2667 Opcode = ARM::t2AUT;
2668 } else if (imm == 0x0F) {
2669 Opcode = ARM::t2BTI;
2670 }
2671
2672 Inst.setOpcode(Opcode);
2673 if (Opcode == ARM::t2HINT) {
2674 Inst.addOperand(MCOperand::createImm(imm));
2675 }
2676
2677 return MCDisassembler::Success;
2678}
2679
2680static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
2681 uint64_t Address,
2682 const MCDisassembler *Decoder) {
2683 DecodeStatus S = MCDisassembler::Success;
2684
2685 unsigned Rd = fieldFromInstruction(Insn, 8, 4);
2686 unsigned imm = 0;
2687
2688 imm |= (fieldFromInstruction(Insn, 0, 8) << 0);
2689 imm |= (fieldFromInstruction(Insn, 12, 3) << 8);
2690 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2691 imm |= (fieldFromInstruction(Insn, 26, 1) << 11);
2692
2693 if (Inst.getOpcode() == ARM::t2MOVTi16)
2694 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2695 return MCDisassembler::Fail;
2696 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2697 return MCDisassembler::Fail;
2698
2699 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2700 Inst.addOperand(MCOperand::createImm(imm));
2701
2702 return S;
2703}
2704
2705static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
2706 uint64_t Address,
2707 const MCDisassembler *Decoder) {
2708 DecodeStatus S = MCDisassembler::Success;
2709
2710 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2711 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2712 unsigned imm = 0;
2713
2714 imm |= (fieldFromInstruction(Insn, 0, 12) << 0);
2715 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2716
2717 if (Inst.getOpcode() == ARM::MOVTi16)
2718 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2719 return MCDisassembler::Fail;
2720
2721 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2722 return MCDisassembler::Fail;
2723
2724 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2725 Inst.addOperand(MCOperand::createImm(imm));
2726
2727 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2728 return MCDisassembler::Fail;
2729
2730 return S;
2731}
2732
2733static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
2734 uint64_t Address,
2735 const MCDisassembler *Decoder) {
2736 DecodeStatus S = MCDisassembler::Success;
2737
2738 unsigned Rd = fieldFromInstruction(Insn, 16, 4);
2739 unsigned Rn = fieldFromInstruction(Insn, 0, 4);
2740 unsigned Rm = fieldFromInstruction(Insn, 8, 4);
2741 unsigned Ra = fieldFromInstruction(Insn, 12, 4);
2742 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2743
2744 if (pred == 0xF)
2745 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2746
2747 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2748 return MCDisassembler::Fail;
2749 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2750 return MCDisassembler::Fail;
2751 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2752 return MCDisassembler::Fail;
2753 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder)))
2754 return MCDisassembler::Fail;
2755
2756 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2757 return MCDisassembler::Fail;
2758
2759 return S;
2760}
2761
2762static DecodeStatus DecodeTSTInstruction(MCInst &Inst, unsigned Insn,
2763 uint64_t Address,
2764 const MCDisassembler *Decoder) {
2765 DecodeStatus S = MCDisassembler::Success;
2766
2767 unsigned Pred = fieldFromInstruction(Insn, 28, 4);
2768 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2769 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2770
2771 if (Pred == 0xF)
2772 return DecodeSETPANInstruction(Inst, Insn, Address, Decoder);
2773
2774 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2775 return MCDisassembler::Fail;
2776 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2777 return MCDisassembler::Fail;
2778 if (!Check(S, DecodePredicateOperand(Inst, Pred, Address, Decoder)))
2779 return MCDisassembler::Fail;
2780
2781 return S;
2782}
2783
2784static DecodeStatus DecodeSETPANInstruction(MCInst &Inst, unsigned Insn,
2785 uint64_t Address,
2786 const MCDisassembler *Decoder) {
2787 DecodeStatus S = MCDisassembler::Success;
2788
2789 unsigned Imm = fieldFromInstruction(Insn, 9, 1);
2790
2791 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
2792 const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits();
2793
2794 if (!FeatureBits[ARM::HasV8_1aOps] ||
2795 !FeatureBits[ARM::HasV8Ops])
2796 return MCDisassembler::Fail;
2797
2798 // Decoder can be called from DecodeTST, which does not check the full
2799 // encoding is valid.
2800 if (fieldFromInstruction(Insn, 20,12) != 0xf11 ||
2801 fieldFromInstruction(Insn, 4,4) != 0)
2802 return MCDisassembler::Fail;
2803 if (fieldFromInstruction(Insn, 10,10) != 0 ||
2804 fieldFromInstruction(Insn, 0,4) != 0)
2805 S = MCDisassembler::SoftFail;
2806
2807 Inst.setOpcode(ARM::SETPAN);
2808 Inst.addOperand(MCOperand::createImm(Imm));
2809
2810 return S;
2811}
2812
2813static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
2814 uint64_t Address,
2815 const MCDisassembler *Decoder) {
2816 DecodeStatus S = MCDisassembler::Success;
2817
2818 unsigned add = fieldFromInstruction(Val, 12, 1);
2819 unsigned imm = fieldFromInstruction(Val, 0, 12);
2820 unsigned Rn = fieldFromInstruction(Val, 13, 4);
2821
2822 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2823 return MCDisassembler::Fail;
2824
2825 if (!add) imm *= -1;
2826 if (imm == 0 && !add) imm = INT32_MIN;
2827 Inst.addOperand(MCOperand::createImm(imm));
2828 if (Rn == 15)
2829 tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder);
2830
2831 return S;
2832}
2833
2834static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
2835 uint64_t Address,
2836 const MCDisassembler *Decoder) {
2837 DecodeStatus S = MCDisassembler::Success;
2838
2839 unsigned Rn = fieldFromInstruction(Val, 9, 4);
2840 // U == 1 to add imm, 0 to subtract it.
2841 unsigned U = fieldFromInstruction(Val, 8, 1);
2842 unsigned imm = fieldFromInstruction(Val, 0, 8);
2843
2844 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2845 return MCDisassembler::Fail;
2846
2847 if (U)
2848 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::add, imm)));
2849 else
2850 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm)));
2851
2852 return S;
2853}
2854
2855static DecodeStatus DecodeAddrMode5FP16Operand(MCInst &Inst, unsigned Val,
2856 uint64_t Address,
2857 const MCDisassembler *Decoder) {
2858 DecodeStatus S = MCDisassembler::Success;
2859
2860 unsigned Rn = fieldFromInstruction(Val, 9, 4);
2861 // U == 1 to add imm, 0 to subtract it.
2862 unsigned U = fieldFromInstruction(Val, 8, 1);
2863 unsigned imm = fieldFromInstruction(Val, 0, 8);
2864
2865 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2866 return MCDisassembler::Fail;
2867
2868 if (U)
2869 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::add, imm)));
2870 else
2871 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::sub, imm)));
2872
2873 return S;
2874}
2875
2876static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
2877 uint64_t Address,
2878 const MCDisassembler *Decoder) {
2879 return DecodeGPRRegisterClass(Inst, Val, Address, Decoder);
2880}
2881
2882static DecodeStatus DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
2883 uint64_t Address,
2884 const MCDisassembler *Decoder) {
2885 DecodeStatus Status = MCDisassembler::Success;
2886
2887 // Note the J1 and J2 values are from the encoded instruction. So here
2888 // change them to I1 and I2 values via as documented:
2889 // I1 = NOT(J1 EOR S);
2890 // I2 = NOT(J2 EOR S);
2891 // and build the imm32 with one trailing zero as documented:
2892 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
2893 unsigned S = fieldFromInstruction(Insn, 26, 1);
2894 unsigned J1 = fieldFromInstruction(Insn, 13, 1);
2895 unsigned J2 = fieldFromInstruction(Insn, 11, 1);
2896 unsigned I1 = !(J1 ^ S);
2897 unsigned I2 = !(J2 ^ S);
2898 unsigned imm10 = fieldFromInstruction(Insn, 16, 10);
2899 unsigned imm11 = fieldFromInstruction(Insn, 0, 11);
2900 unsigned tmp = (S << 23) | (I1 << 22) | (I2 << 21) | (imm10 << 11) | imm11;
2901 int imm32 = SignExtend32<25>(tmp << 1);
2902 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
2903 true, 4, Inst, Decoder))
2904 Inst.addOperand(MCOperand::createImm(imm32));
2905
2906 return Status;
2907}
2908
2909static DecodeStatus DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn,
2910 uint64_t Address,
2911 const MCDisassembler *Decoder) {
2912 DecodeStatus S = MCDisassembler::Success;
2913
2914 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2915 unsigned imm = fieldFromInstruction(Insn, 0, 24) << 2;
2916
2917 if (pred == 0xF) {
2918 Inst.setOpcode(ARM::BLXi);
2919 imm |= fieldFromInstruction(Insn, 24, 1) << 1;
2920 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2921 true, 4, Inst, Decoder))
2922 Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm)));
2923 return S;
2924 }
2925
2926 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2927 true, 4, Inst, Decoder))
2928 Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm)));
2929
2930 // We already have BL_pred for BL w/ predicate, no need to add addition
2931 // predicate opreands for BL
2932 if (Inst.getOpcode() != ARM::BL)
2933 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2934 return MCDisassembler::Fail;
2935
2936 return S;
2937}
2938
2939static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
2940 uint64_t Address,
2941 const MCDisassembler *Decoder) {
2942 DecodeStatus S = MCDisassembler::Success;
2943
2944 unsigned Rm = fieldFromInstruction(Val, 0, 4);
2945 unsigned align = fieldFromInstruction(Val, 4, 2);
2946
2947 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2948 return MCDisassembler::Fail;
2949 if (!align)
2950 Inst.addOperand(MCOperand::createImm(0));
2951 else
2952 Inst.addOperand(MCOperand::createImm(4 << align));
2953
2954 return S;
2955}
2956
2957static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Insn,
2958 uint64_t Address,
2959 const MCDisassembler *Decoder) {
2960 DecodeStatus S = MCDisassembler::Success;
2961
2962 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2963 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2964 unsigned wb = fieldFromInstruction(Insn, 16, 4);
2965 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2966 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
2967 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2968
2969 // First output register
2970 switch (Inst.getOpcode()) {
2971 case ARM::VLD1q16: case ARM::VLD1q32: case ARM::VLD1q64: case ARM::VLD1q8:
2972 case ARM::VLD1q16wb_fixed: case ARM::VLD1q16wb_register:
2973 case ARM::VLD1q32wb_fixed: case ARM::VLD1q32wb_register:
2974 case ARM::VLD1q64wb_fixed: case ARM::VLD1q64wb_register:
2975 case ARM::VLD1q8wb_fixed: case ARM::VLD1q8wb_register:
2976 case ARM::VLD2d16: case ARM::VLD2d32: case ARM::VLD2d8:
2977 case ARM::VLD2d16wb_fixed: case ARM::VLD2d16wb_register:
2978 case ARM::VLD2d32wb_fixed: case ARM::VLD2d32wb_register:
2979 case ARM::VLD2d8wb_fixed: case ARM::VLD2d8wb_register:
2980 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2981 return MCDisassembler::Fail;
2982 break;
2983 case ARM::VLD2b16:
2984 case ARM::VLD2b32:
2985 case ARM::VLD2b8:
2986 case ARM::VLD2b16wb_fixed:
2987 case ARM::VLD2b16wb_register:
2988 case ARM::VLD2b32wb_fixed:
2989 case ARM::VLD2b32wb_register:
2990 case ARM::VLD2b8wb_fixed:
2991 case ARM::VLD2b8wb_register:
2992 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2993 return MCDisassembler::Fail;
2994 break;
2995 default:
2996 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2997 return MCDisassembler::Fail;
2998 }
2999
3000 // Second output register
3001 switch (Inst.getOpcode()) {
3002 case ARM::VLD3d8:
3003 case ARM::VLD3d16:
3004 case ARM::VLD3d32:
3005 case ARM::VLD3d8_UPD:
3006 case ARM::VLD3d16_UPD:
3007 case ARM::VLD3d32_UPD:
3008 case ARM::VLD4d8:
3009 case ARM::VLD4d16:
3010 case ARM::VLD4d32:
3011 case ARM::VLD4d8_UPD:
3012 case ARM::VLD4d16_UPD:
3013 case ARM::VLD4d32_UPD:
3014 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
3015 return MCDisassembler::Fail;
3016 break;
3017 case ARM::VLD3q8:
3018 case ARM::VLD3q16:
3019 case ARM::VLD3q32:
3020 case ARM::VLD3q8_UPD:
3021 case ARM::VLD3q16_UPD:
3022 case ARM::VLD3q32_UPD:
3023 case ARM::VLD4q8:
3024 case ARM::VLD4q16:
3025 case ARM::VLD4q32:
3026 case ARM::VLD4q8_UPD:
3027 case ARM::VLD4q16_UPD:
3028 case ARM::VLD4q32_UPD:
3029 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3030 return MCDisassembler::Fail;
3031 break;
3032 default:
3033 break;
3034 }
3035
3036 // Third output register
3037 switch(Inst.getOpcode()) {
3038 case ARM::VLD3d8:
3039 case ARM::VLD3d16:
3040 case ARM::VLD3d32:
3041 case ARM::VLD3d8_UPD:
3042 case ARM::VLD3d16_UPD:
3043 case ARM::VLD3d32_UPD:
3044 case ARM::VLD4d8:
3045 case ARM::VLD4d16:
3046 case ARM::VLD4d32:
3047 case ARM::VLD4d8_UPD:
3048 case ARM::VLD4d16_UPD:
3049 case ARM::VLD4d32_UPD:
3050 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3051 return MCDisassembler::Fail;
3052 break;
3053 case ARM::VLD3q8:
3054 case ARM::VLD3q16:
3055 case ARM::VLD3q32:
3056 case ARM::VLD3q8_UPD:
3057 case ARM::VLD3q16_UPD:
3058 case ARM::VLD3q32_UPD:
3059 case ARM::VLD4q8:
3060 case ARM::VLD4q16:
3061 case ARM::VLD4q32:
3062 case ARM::VLD4q8_UPD:
3063 case ARM::VLD4q16_UPD:
3064 case ARM::VLD4q32_UPD:
3065 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
3066 return MCDisassembler::Fail;
3067 break;
3068 default:
3069 break;
3070 }
3071
3072 // Fourth output register
3073 switch (Inst.getOpcode()) {
3074 case ARM::VLD4d8:
3075 case ARM::VLD4d16:
3076 case ARM::VLD4d32:
3077 case ARM::VLD4d8_UPD:
3078 case ARM::VLD4d16_UPD:
3079 case ARM::VLD4d32_UPD:
3080 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
3081 return MCDisassembler::Fail;
3082 break;
3083 case ARM::VLD4q8:
3084 case ARM::VLD4q16:
3085 case ARM::VLD4q32:
3086 case ARM::VLD4q8_UPD:
3087 case ARM::VLD4q16_UPD:
3088 case ARM::VLD4q32_UPD:
3089 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
3090 return MCDisassembler::Fail;
3091 break;
3092 default:
3093 break;
3094 }
3095
3096 // Writeback operand
3097 switch (Inst.getOpcode()) {
3098 case ARM::VLD1d8wb_fixed:
3099 case ARM::VLD1d16wb_fixed:
3100 case ARM::VLD1d32wb_fixed:
3101 case ARM::VLD1d64wb_fixed:
3102 case ARM::VLD1d8wb_register:
3103 case ARM::VLD1d16wb_register:
3104 case ARM::VLD1d32wb_register:
3105 case ARM::VLD1d64wb_register:
3106 case ARM::VLD1q8wb_fixed:
3107 case ARM::VLD1q16wb_fixed:
3108 case ARM::VLD1q32wb_fixed:
3109 case ARM::VLD1q64wb_fixed:
3110 case ARM::VLD1q8wb_register:
3111 case ARM::VLD1q16wb_register:
3112 case ARM::VLD1q32wb_register:
3113 case ARM::VLD1q64wb_register:
3114 case ARM::VLD1d8Twb_fixed:
3115 case ARM::VLD1d8Twb_register:
3116 case ARM::VLD1d16Twb_fixed:
3117 case ARM::VLD1d16Twb_register:
3118 case ARM::VLD1d32Twb_fixed:
3119 case ARM::VLD1d32Twb_register:
3120 case ARM::VLD1d64Twb_fixed:
3121 case ARM::VLD1d64Twb_register:
3122 case ARM::VLD1d8Qwb_fixed:
3123 case ARM::VLD1d8Qwb_register:
3124 case ARM::VLD1d16Qwb_fixed:
3125 case ARM::VLD1d16Qwb_register:
3126 case ARM::VLD1d32Qwb_fixed:
3127 case ARM::VLD1d32Qwb_register:
3128 case ARM::VLD1d64Qwb_fixed:
3129 case ARM::VLD1d64Qwb_register:
3130 case ARM::VLD2d8wb_fixed:
3131 case ARM::VLD2d16wb_fixed:
3132 case ARM::VLD2d32wb_fixed:
3133 case ARM::VLD2q8wb_fixed:
3134 case ARM::VLD2q16wb_fixed:
3135 case ARM::VLD2q32wb_fixed:
3136 case ARM::VLD2d8wb_register:
3137 case ARM::VLD2d16wb_register:
3138 case ARM::VLD2d32wb_register:
3139 case ARM::VLD2q8wb_register:
3140 case ARM::VLD2q16wb_register:
3141 case ARM::VLD2q32wb_register:
3142 case ARM::VLD2b8wb_fixed:
3143 case ARM::VLD2b16wb_fixed:
3144 case ARM::VLD2b32wb_fixed:
3145 case ARM::VLD2b8wb_register:
3146 case ARM::VLD2b16wb_register:
3147 case ARM::VLD2b32wb_register:
3148 Inst.addOperand(MCOperand::createImm(0));
3149 break;
3150 case ARM::VLD3d8_UPD:
3151 case ARM::VLD3d16_UPD:
3152 case ARM::VLD3d32_UPD:
3153 case ARM::VLD3q8_UPD:
3154 case ARM::VLD3q16_UPD:
3155 case ARM::VLD3q32_UPD:
3156 case ARM::VLD4d8_UPD:
3157 case ARM::VLD4d16_UPD:
3158 case ARM::VLD4d32_UPD:
3159 case ARM::VLD4q8_UPD:
3160 case ARM::VLD4q16_UPD:
3161 case ARM::VLD4q32_UPD:
3162 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
3163 return MCDisassembler::Fail;
3164 break;
3165 default:
3166 break;
3167 }
3168
3169 // AddrMode6 Base (register+alignment)
3170 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
3171 return MCDisassembler::Fail;
3172
3173 // AddrMode6 Offset (register)
3174 switch (Inst.getOpcode()) {
3175 default:
3176 // The below have been updated to have explicit am6offset split
3177 // between fixed and register offset. For those instructions not
3178 // yet updated, we need to add an additional reg0 operand for the
3179 // fixed variant.
3180 //
3181 // The fixed offset encodes as Rm == 0xd, so we check for that.
3182 if (Rm == 0xd) {
3183 Inst.addOperand(MCOperand::createReg(0));
3184 break;
3185 }
3186 // Fall through to handle the register offset variant.
3187 [[fallthrough]];
3188 case ARM::VLD1d8wb_fixed:
3189 case ARM::VLD1d16wb_fixed:
3190 case ARM::VLD1d32wb_fixed:
3191 case ARM::VLD1d64wb_fixed:
3192 case ARM::VLD1d8Twb_fixed:
3193 case ARM::VLD1d16Twb_fixed:
3194 case ARM::VLD1d32Twb_fixed:
3195 case ARM::VLD1d64Twb_fixed:
3196 case ARM::VLD1d8Qwb_fixed:
3197 case ARM::VLD1d16Qwb_fixed:
3198 case ARM::VLD1d32Qwb_fixed:
3199 case ARM::VLD1d64Qwb_fixed:
3200 case ARM::VLD1d8wb_register:
3201 case ARM::VLD1d16wb_register:
3202 case ARM::VLD1d32wb_register:
3203 case ARM::VLD1d64wb_register:
3204 case ARM::VLD1q8wb_fixed:
3205 case ARM::VLD1q16wb_fixed:
3206 case ARM::VLD1q32wb_fixed:
3207 case ARM::VLD1q64wb_fixed:
3208 case ARM::VLD1q8wb_register:
3209 case ARM::VLD1q16wb_register:
3210 case ARM::VLD1q32wb_register:
3211 case ARM::VLD1q64wb_register:
3212 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
3213 // variant encodes Rm == 0xf. Anything else is a register offset post-
3214 // increment and we need to add the register operand to the instruction.
3215 if (Rm != 0xD && Rm != 0xF &&
3216 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3217 return MCDisassembler::Fail;
3218 break;
3219 case ARM::VLD2d8wb_fixed:
3220 case ARM::VLD2d16wb_fixed:
3221 case ARM::VLD2d32wb_fixed:
3222 case ARM::VLD2b8wb_fixed:
3223 case ARM::VLD2b16wb_fixed:
3224 case ARM::VLD2b32wb_fixed:
3225 case ARM::VLD2q8wb_fixed:
3226 case ARM::VLD2q16wb_fixed:
3227 case ARM::VLD2q32wb_fixed:
3228 break;
3229 }
3230
3231 return S;
3232}
3233
3234static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Insn,
3235 uint64_t Address,
3236 const MCDisassembler *Decoder) {
3237 unsigned type = fieldFromInstruction(Insn, 8, 4);
3238 unsigned align = fieldFromInstruction(Insn, 4, 2);
3239 if (type == 6 && (align & 2)) return MCDisassembler::Fail;
3240 if (type == 7 && (align & 2)) return MCDisassembler::Fail;
3241 if (type == 10 && align == 3) return MCDisassembler::Fail;
3242
3243 unsigned load = fieldFromInstruction(Insn, 21, 1);
3244 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3245 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3246}
3247
3248static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Insn,
3249 uint64_t Address,
3250 const MCDisassembler *Decoder) {
3251 unsigned size = fieldFromInstruction(Insn, 6, 2);
3252 if (size == 3) return MCDisassembler::Fail;
3253
3254 unsigned type = fieldFromInstruction(Insn, 8, 4);
3255 unsigned align = fieldFromInstruction(Insn, 4, 2);
3256 if (type == 8 && align == 3) return MCDisassembler::Fail;
3257 if (type == 9 && align == 3) return MCDisassembler::Fail;
3258
3259 unsigned load = fieldFromInstruction(Insn, 21, 1);
3260 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3261 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3262}
3263
3264static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Insn,
3265 uint64_t Address,
3266 const MCDisassembler *Decoder) {
3267 unsigned size = fieldFromInstruction(Insn, 6, 2);
3268 if (size == 3) return MCDisassembler::Fail;
3269
3270 unsigned align = fieldFromInstruction(Insn, 4, 2);
3271 if (align & 2) return MCDisassembler::Fail;
3272
3273 unsigned load = fieldFromInstruction(Insn, 21, 1);
3274 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3275 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3276}
3277
3278static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Insn,
3279 uint64_t Address,
3280 const MCDisassembler *Decoder) {
3281 unsigned size = fieldFromInstruction(Insn, 6, 2);
3282 if (size == 3) return MCDisassembler::Fail;
3283
3284 unsigned load = fieldFromInstruction(Insn, 21, 1);
3285 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3286 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3287}
3288
3289static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Insn,
3290 uint64_t Address,
3291 const MCDisassembler *Decoder) {
3292 DecodeStatus S = MCDisassembler::Success;
3293
3294 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3295 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3296 unsigned wb = fieldFromInstruction(Insn, 16, 4);
3297 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3298 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
3299 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3300
3301 // Writeback Operand
3302 switch (Inst.getOpcode()) {
3303 case ARM::VST1d8wb_fixed:
3304 case ARM::VST1d16wb_fixed:
3305 case ARM::VST1d32wb_fixed:
3306 case ARM::VST1d64wb_fixed:
3307 case ARM::VST1d8wb_register:
3308 case ARM::VST1d16wb_register:
3309 case ARM::VST1d32wb_register:
3310 case ARM::VST1d64wb_register:
3311 case ARM::VST1q8wb_fixed:
3312 case ARM::VST1q16wb_fixed:
3313 case ARM::VST1q32wb_fixed:
3314 case ARM::VST1q64wb_fixed:
3315 case ARM::VST1q8wb_register:
3316 case ARM::VST1q16wb_register:
3317 case ARM::VST1q32wb_register:
3318 case ARM::VST1q64wb_register:
3319 case ARM::VST1d8Twb_fixed:
3320 case ARM::VST1d16Twb_fixed:
3321 case ARM::VST1d32Twb_fixed:
3322 case ARM::VST1d64Twb_fixed:
3323 case ARM::VST1d8Twb_register:
3324 case ARM::VST1d16Twb_register:
3325 case ARM::VST1d32Twb_register:
3326 case ARM::VST1d64Twb_register:
3327 case ARM::VST1d8Qwb_fixed:
3328 case ARM::VST1d16Qwb_fixed:
3329 case ARM::VST1d32Qwb_fixed:
3330 case ARM::VST1d64Qwb_fixed:
3331 case ARM::VST1d8Qwb_register:
3332 case ARM::VST1d16Qwb_register:
3333 case ARM::VST1d32Qwb_register:
3334 case ARM::VST1d64Qwb_register:
3335 case ARM::VST2d8wb_fixed:
3336 case ARM::VST2d16wb_fixed:
3337 case ARM::VST2d32wb_fixed:
3338 case ARM::VST2d8wb_register:
3339 case ARM::VST2d16wb_register:
3340 case ARM::VST2d32wb_register:
3341 case ARM::VST2q8wb_fixed:
3342 case ARM::VST2q16wb_fixed:
3343 case ARM::VST2q32wb_fixed:
3344 case ARM::VST2q8wb_register:
3345 case ARM::VST2q16wb_register:
3346 case ARM::VST2q32wb_register:
3347 case ARM::VST2b8wb_fixed:
3348 case ARM::VST2b16wb_fixed:
3349 case ARM::VST2b32wb_fixed:
3350 case ARM::VST2b8wb_register:
3351 case ARM::VST2b16wb_register:
3352 case ARM::VST2b32wb_register:
3353 if (Rm == 0xF)
3354 return MCDisassembler::Fail;
3355 Inst.addOperand(MCOperand::createImm(0));
3356 break;
3357 case ARM::VST3d8_UPD:
3358 case ARM::VST3d16_UPD:
3359 case ARM::VST3d32_UPD:
3360 case ARM::VST3q8_UPD:
3361 case ARM::VST3q16_UPD:
3362 case ARM::VST3q32_UPD:
3363 case ARM::VST4d8_UPD:
3364 case ARM::VST4d16_UPD:
3365 case ARM::VST4d32_UPD:
3366 case ARM::VST4q8_UPD:
3367 case ARM::VST4q16_UPD:
3368 case ARM::VST4q32_UPD:
3369 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
3370 return MCDisassembler::Fail;
3371 break;
3372 default:
3373 break;
3374 }
3375
3376 // AddrMode6 Base (register+alignment)
3377 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
3378 return MCDisassembler::Fail;
3379
3380 // AddrMode6 Offset (register)
3381 switch (Inst.getOpcode()) {
3382 default:
3383 if (Rm == 0xD)
3384 Inst.addOperand(MCOperand::createReg(0));
3385 else if (Rm != 0xF) {
3386 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3387 return MCDisassembler::Fail;
3388 }
3389 break;
3390 case ARM::VST1d8wb_fixed:
3391 case ARM::VST1d16wb_fixed:
3392 case ARM::VST1d32wb_fixed:
3393 case ARM::VST1d64wb_fixed:
3394 case ARM::VST1q8wb_fixed:
3395 case ARM::VST1q16wb_fixed:
3396 case ARM::VST1q32wb_fixed:
3397 case ARM::VST1q64wb_fixed:
3398 case ARM::VST1d8Twb_fixed:
3399 case ARM::VST1d16Twb_fixed:
3400 case ARM::VST1d32Twb_fixed:
3401 case ARM::VST1d64Twb_fixed:
3402 case ARM::VST1d8Qwb_fixed:
3403 case ARM::VST1d16Qwb_fixed:
3404 case ARM::VST1d32Qwb_fixed:
3405 case ARM::VST1d64Qwb_fixed:
3406 case ARM::VST2d8wb_fixed:
3407 case ARM::VST2d16wb_fixed:
3408 case ARM::VST2d32wb_fixed:
3409 case ARM::VST2q8wb_fixed:
3410 case ARM::VST2q16wb_fixed:
3411 case ARM::VST2q32wb_fixed:
3412 case ARM::VST2b8wb_fixed:
3413 case ARM::VST2b16wb_fixed:
3414 case ARM::VST2b32wb_fixed:
3415 break;
3416 }
3417
3418 // First input register
3419 switch (Inst.getOpcode()) {
3420 case ARM::VST1q16:
3421 case ARM::VST1q32:
3422 case ARM::VST1q64:
3423 case ARM::VST1q8:
3424 case ARM::VST1q16wb_fixed:
3425 case ARM::VST1q16wb_register:
3426 case ARM::VST1q32wb_fixed:
3427 case ARM::VST1q32wb_register:
3428 case ARM::VST1q64wb_fixed:
3429 case ARM::VST1q64wb_register:
3430 case ARM::VST1q8wb_fixed:
3431 case ARM::VST1q8wb_register:
3432 case ARM::VST2d16:
3433 case ARM::VST2d32:
3434 case ARM::VST2d8:
3435 case ARM::VST2d16wb_fixed:
3436 case ARM::VST2d16wb_register:
3437 case ARM::VST2d32wb_fixed:
3438 case ARM::VST2d32wb_register:
3439 case ARM::VST2d8wb_fixed:
3440 case ARM::VST2d8wb_register:
3441 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3442 return MCDisassembler::Fail;
3443 break;
3444 case ARM::VST2b16:
3445 case ARM::VST2b32:
3446 case ARM::VST2b8:
3447 case ARM::VST2b16wb_fixed:
3448 case ARM::VST2b16wb_register:
3449 case ARM::VST2b32wb_fixed:
3450 case ARM::VST2b32wb_register:
3451 case ARM::VST2b8wb_fixed:
3452 case ARM::VST2b8wb_register:
3453 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
3454 return MCDisassembler::Fail;
3455 break;
3456 default:
3457 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3458 return MCDisassembler::Fail;
3459 }
3460
3461 // Second input register
3462 switch (Inst.getOpcode()) {
3463 case ARM::VST3d8:
3464 case ARM::VST3d16:
3465 case ARM::VST3d32:
3466 case ARM::VST3d8_UPD:
3467 case ARM::VST3d16_UPD:
3468 case ARM::VST3d32_UPD:
3469 case ARM::VST4d8:
3470 case ARM::VST4d16:
3471 case ARM::VST4d32:
3472 case ARM::VST4d8_UPD:
3473 case ARM::VST4d16_UPD:
3474 case ARM::VST4d32_UPD:
3475 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
3476 return MCDisassembler::Fail;
3477 break;
3478 case ARM::VST3q8:
3479 case ARM::VST3q16:
3480 case ARM::VST3q32:
3481 case ARM::VST3q8_UPD:
3482 case ARM::VST3q16_UPD:
3483 case ARM::VST3q32_UPD:
3484 case ARM::VST4q8:
3485 case ARM::VST4q16:
3486 case ARM::VST4q32:
3487 case ARM::VST4q8_UPD:
3488 case ARM::VST4q16_UPD:
3489 case ARM::VST4q32_UPD:
3490 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3491 return MCDisassembler::Fail;
3492 break;
3493 default:
3494 break;
3495 }
3496
3497 // Third input register
3498 switch (Inst.getOpcode()) {
3499 case ARM::VST3d8:
3500 case ARM::VST3d16:
3501 case ARM::VST3d32:
3502 case ARM::VST3d8_UPD:
3503 case ARM::VST3d16_UPD:
3504 case ARM::VST3d32_UPD:
3505 case ARM::VST4d8:
3506 case ARM::VST4d16:
3507 case ARM::VST4d32:
3508 case ARM::VST4d8_UPD:
3509 case ARM::VST4d16_UPD:
3510 case ARM::VST4d32_UPD:
3511 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3512 return MCDisassembler::Fail;
3513 break;
3514 case ARM::VST3q8:
3515 case ARM::VST3q16:
3516 case ARM::VST3q32:
3517 case ARM::VST3q8_UPD:
3518 case ARM::VST3q16_UPD:
3519 case ARM::VST3q32_UPD:
3520 case ARM::VST4q8:
3521 case ARM::VST4q16:
3522 case ARM::VST4q32:
3523 case ARM::VST4q8_UPD:
3524 case ARM::VST4q16_UPD:
3525 case ARM::VST4q32_UPD:
3526 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
3527 return MCDisassembler::Fail;
3528 break;
3529 default:
3530 break;
3531 }
3532
3533 // Fourth input register
3534 switch (Inst.getOpcode()) {
3535 case ARM::VST4d8:
3536 case ARM::VST4d16:
3537 case ARM::VST4d32:
3538 case ARM::VST4d8_UPD:
3539 case ARM::VST4d16_UPD:
3540 case ARM::VST4d32_UPD:
3541 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
3542 return MCDisassembler::Fail;
3543 break;
3544 case ARM::VST4q8:
3545 case ARM::VST4q16:
3546 case ARM::VST4q32:
3547 case ARM::VST4q8_UPD:
3548 case ARM::VST4q16_UPD:
3549 case ARM::VST4q32_UPD:
3550 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
3551 return MCDisassembler::Fail;
3552 break;
3553 default:
3554 break;
3555 }
3556
3557 return S;
3558}
3559
3560static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Insn,
3561 uint64_t Address,
3562 const MCDisassembler *Decoder) {
3563 DecodeStatus S = MCDisassembler::Success;
3564
3565 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3566 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3567 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3568 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3569 unsigned align = fieldFromInstruction(Insn, 4, 1);
3570 unsigned size = fieldFromInstruction(Insn, 6, 2);
3571
3572 if (size == 0 && align == 1)
3573 return MCDisassembler::Fail;
3574 align *= (1 << size);
3575
3576 switch (Inst.getOpcode()) {
3577 case ARM::VLD1DUPq16: case ARM::VLD1DUPq32: case ARM::VLD1DUPq8:
3578 case ARM::VLD1DUPq16wb_fixed: case ARM::VLD1DUPq16wb_register:
3579 case ARM::VLD1DUPq32wb_fixed: case ARM::VLD1DUPq32wb_register:
3580 case ARM::VLD1DUPq8wb_fixed: case ARM::VLD1DUPq8wb_register:
3581 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3582 return MCDisassembler::Fail;
3583 break;
3584 default:
3585 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3586 return MCDisassembler::Fail;
3587 break;
3588 }
3589 if (Rm != 0xF) {
3590 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3591 return MCDisassembler::Fail;
3592 }
3593
3594 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3595 return MCDisassembler::Fail;
3596 Inst.addOperand(MCOperand::createImm(align));
3597
3598 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
3599 // variant encodes Rm == 0xf. Anything else is a register offset post-
3600 // increment and we need to add the register operand to the instruction.
3601 if (Rm != 0xD && Rm != 0xF &&
3602 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3603 return MCDisassembler::Fail;
3604
3605 return S;
3606}
3607
3608static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Insn,
3609 uint64_t Address,
3610 const MCDisassembler *Decoder) {
3611 DecodeStatus S = MCDisassembler::Success;
3612
3613 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3614 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3615 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3616 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3617 unsigned align = fieldFromInstruction(Insn, 4, 1);
3618 unsigned size = 1 << fieldFromInstruction(Insn, 6, 2);
3619 align *= 2*size;
3620
3621 switch (Inst.getOpcode()) {
3622 case ARM::VLD2DUPd16: case ARM::VLD2DUPd32: case ARM::VLD2DUPd8:
3623 case ARM::VLD2DUPd16wb_fixed: case ARM::VLD2DUPd16wb_register:
3624 case ARM::VLD2DUPd32wb_fixed: case ARM::VLD2DUPd32wb_register:
3625 case ARM::VLD2DUPd8wb_fixed: case ARM::VLD2DUPd8wb_register:
3626 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3627 return MCDisassembler::Fail;
3628 break;
3629 case ARM::VLD2DUPd16x2: case ARM::VLD2DUPd32x2: case ARM::VLD2DUPd8x2:
3630 case ARM::VLD2DUPd16x2wb_fixed: case ARM::VLD2DUPd16x2wb_register:
3631 case ARM::VLD2DUPd32x2wb_fixed: case ARM::VLD2DUPd32x2wb_register:
3632 case ARM::VLD2DUPd8x2wb_fixed: case ARM::VLD2DUPd8x2wb_register:
3633 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
3634 return MCDisassembler::Fail;
3635 break;
3636 default:
3637 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3638 return MCDisassembler::Fail;
3639 break;
3640 }
3641
3642 if (Rm != 0xF)
3643 Inst.addOperand(MCOperand::createImm(0));
3644
3645 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3646 return MCDisassembler::Fail;
3647 Inst.addOperand(MCOperand::createImm(align));
3648
3649 if (Rm != 0xD && Rm != 0xF) {
3650 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3651 return MCDisassembler::Fail;
3652 }
3653
3654 return S;
3655}
3656
3657static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Insn,
3658 uint64_t Address,
3659 const MCDisassembler *Decoder) {
3660 DecodeStatus S = MCDisassembler::Success;
3661
3662 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3663 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3664 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3665 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3666 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
3667
3668 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3669 return MCDisassembler::Fail;
3670 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
3671 return MCDisassembler::Fail;
3672 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
3673 return MCDisassembler::Fail;
3674 if (Rm != 0xF) {
3675 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3676 return MCDisassembler::Fail;
3677 }
3678
3679 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3680 return MCDisassembler::Fail;
3681 Inst.addOperand(MCOperand::createImm(0));
3682
3683 if (Rm == 0xD)
3684 Inst.addOperand(MCOperand::createReg(0));
3685 else if (Rm != 0xF) {
3686 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3687 return MCDisassembler::Fail;
3688 }
3689
3690 return S;
3691}
3692
3693static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Insn,
3694 uint64_t Address,
3695 const MCDisassembler *Decoder) {
3696 DecodeStatus S = MCDisassembler::Success;
3697
3698 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3699 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3700 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3701 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3702 unsigned size = fieldFromInstruction(Insn, 6, 2);
3703 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
3704 unsigned align = fieldFromInstruction(Insn, 4, 1);
3705
3706 if (size == 0x3) {
3707 if (align == 0)
3708 return MCDisassembler::Fail;
3709 align = 16;
3710 } else {
3711 if (size == 2) {
3712 align *= 8;
3713 } else {
3714 size = 1 << size;
3715 align *= 4*size;
3716 }
3717 }
3718
3719 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3720 return MCDisassembler::Fail;
3721 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
3722 return MCDisassembler::Fail;
3723 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
3724 return MCDisassembler::Fail;
3725 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder)))
3726 return MCDisassembler::Fail;
3727 if (Rm != 0xF) {
3728 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3729 return MCDisassembler::Fail;
3730 }
3731
3732 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3733 return MCDisassembler::Fail;
3734 Inst.addOperand(MCOperand::createImm(align));
3735
3736 if (Rm == 0xD)
3737 Inst.addOperand(MCOperand::createReg(0));
3738 else if (Rm != 0xF) {
3739 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3740 return MCDisassembler::Fail;
3741 }
3742
3743 return S;
3744}
3745
3746static DecodeStatus DecodeVMOVModImmInstruction(MCInst &Inst, unsigned Insn,
3747 uint64_t Address,
3748 const MCDisassembler *Decoder) {
3749 DecodeStatus S = MCDisassembler::Success;
3750
3751 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3752 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3753 unsigned imm = fieldFromInstruction(Insn, 0, 4);
3754 imm |= fieldFromInstruction(Insn, 16, 3) << 4;
3755 imm |= fieldFromInstruction(Insn, 24, 1) << 7;
3756 imm |= fieldFromInstruction(Insn, 8, 4) << 8;
3757 imm |= fieldFromInstruction(Insn, 5, 1) << 12;
3758 unsigned Q = fieldFromInstruction(Insn, 6, 1);
3759
3760 if (Q) {
3761 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3762 return MCDisassembler::Fail;
3763 } else {
3764 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3765 return MCDisassembler::Fail;
3766 }
3767
3768 Inst.addOperand(MCOperand::createImm(imm));
3769
3770 switch (Inst.getOpcode()) {
3771 case ARM::VORRiv4i16:
3772 case ARM::VORRiv2i32:
3773 case ARM::VBICiv4i16:
3774 case ARM::VBICiv2i32:
3775 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3776 return MCDisassembler::Fail;
3777 break;
3778 case ARM::VORRiv8i16:
3779 case ARM::VORRiv4i32:
3780 case ARM::VBICiv8i16:
3781 case ARM::VBICiv4i32:
3782 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3783 return MCDisassembler::Fail;
3784 break;
3785 default:
3786 break;
3787 }
3788
3789 return S;
3790}
3791
3792static DecodeStatus DecodeMVEModImmInstruction(MCInst &Inst, unsigned Insn,
3793 uint64_t Address,
3794 const MCDisassembler *Decoder) {
3795 DecodeStatus S = MCDisassembler::Success;
3796
3797 unsigned Qd = ((fieldFromInstruction(Insn, 22, 1) << 3) |
3798 fieldFromInstruction(Insn, 13, 3));
3799 unsigned cmode = fieldFromInstruction(Insn, 8, 4);
3800 unsigned imm = fieldFromInstruction(Insn, 0, 4);
3801 imm |= fieldFromInstruction(Insn, 16, 3) << 4;
3802 imm |= fieldFromInstruction(Insn, 28, 1) << 7;
3803 imm |= cmode << 8;
3804 imm |= fieldFromInstruction(Insn, 5, 1) << 12;
3805
3806 if (cmode == 0xF && Inst.getOpcode() == ARM::MVE_VMVNimmi32)
3807 return MCDisassembler::Fail;
3808
3809 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
3810 return MCDisassembler::Fail;
3811
3812 Inst.addOperand(MCOperand::createImm(imm));
3813
3814 Inst.addOperand(MCOperand::createImm(ARMVCC::None));
3815 Inst.addOperand(MCOperand::createReg(0));
3816 Inst.addOperand(MCOperand::createImm(0));
3817
3818 return S;
3819}
3820
3821static DecodeStatus DecodeMVEVADCInstruction(MCInst &Inst, unsigned Insn,
3822 uint64_t Address,
3823 const MCDisassembler *Decoder) {
3824 DecodeStatus S = MCDisassembler::Success;
3825
3826 unsigned Qd = fieldFromInstruction(Insn, 13, 3);
3827 Qd |= fieldFromInstruction(Insn, 22, 1) << 3;
3828 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
3829 return MCDisassembler::Fail;
3830 Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
3831
3832 unsigned Qn = fieldFromInstruction(Insn, 17, 3);
3833 Qn |= fieldFromInstruction(Insn, 7, 1) << 3;
3834 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qn, Address, Decoder)))
3835 return MCDisassembler::Fail;
3836 unsigned Qm = fieldFromInstruction(Insn, 1, 3);
3837 Qm |= fieldFromInstruction(Insn, 5, 1) << 3;
3838 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
3839 return MCDisassembler::Fail;
3840 if (!fieldFromInstruction(Insn, 12, 1)) // I bit clear => need input FPSCR
3841 Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
3842 Inst.addOperand(MCOperand::createImm(Qd));
3843
3844 return S;
3845}
3846
3847static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Insn,
3848 uint64_t Address,
3849 const MCDisassembler *Decoder) {
3850 DecodeStatus S = MCDisassembler::Success;
3851
3852 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3853 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3854 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3855 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3856 unsigned size = fieldFromInstruction(Insn, 18, 2);
3857
3858 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3859 return MCDisassembler::Fail;
3860 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3861 return MCDisassembler::Fail;
3862 Inst.addOperand(MCOperand::createImm(8 << size));
3863
3864 return S;
3865}
3866
3867static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
3868 uint64_t Address,
3869 const MCDisassembler *Decoder) {
3870 Inst.addOperand(MCOperand::createImm(8 - Val));
3871 return MCDisassembler::Success;
3872}
3873
3874static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
3875 uint64_t Address,
3876 const MCDisassembler *Decoder) {
3877 Inst.addOperand(MCOperand::createImm(16 - Val));
3878 return MCDisassembler::Success;
3879}
3880
3881static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
3882 uint64_t Address,
3883 const MCDisassembler *Decoder) {
3884 Inst.addOperand(MCOperand::createImm(32 - Val));
3885 return MCDisassembler::Success;
3886}
3887
3888static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
3889 uint64_t Address,
3890 const MCDisassembler *Decoder) {
3891 Inst.addOperand(MCOperand::createImm(64 - Val));
3892 return MCDisassembler::Success;
3893}
3894
3895static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
3896 uint64_t Address,
3897 const MCDisassembler *Decoder) {
3898 DecodeStatus S = MCDisassembler::Success;
3899
3900 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3901 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3902 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3903 Rn |= fieldFromInstruction(Insn, 7, 1) << 4;
3904 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3905 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3906 unsigned op = fieldFromInstruction(Insn, 6, 1);
3907
3908 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3909 return MCDisassembler::Fail;
3910 if (op) {
3911 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3912 return MCDisassembler::Fail; // Writeback
3913 }
3914
3915 switch (Inst.getOpcode()) {
3916 case ARM::VTBL2:
3917 case ARM::VTBX2:
3918 if (!Check(S, DecodeDPairRegisterClass(Inst, Rn, Address, Decoder)))
3919 return MCDisassembler::Fail;
3920 break;
3921 default:
3922 if (!Check(S, DecodeDPRRegisterClass(Inst, Rn, Address, Decoder)))
3923 return MCDisassembler::Fail;
3924 }
3925
3926 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3927 return MCDisassembler::Fail;
3928
3929 return S;
3930}
3931
3932static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
3933 uint64_t Address,
3934 const MCDisassembler *Decoder) {
3935 DecodeStatus S = MCDisassembler::Success;
3936
3937 unsigned dst = fieldFromInstruction(Insn, 8, 3);
3938 unsigned imm = fieldFromInstruction(Insn, 0, 8);
3939
3940 if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder)))
3941 return MCDisassembler::Fail;
3942
3943 switch(Inst.getOpcode()) {
3944 default:
3945 return MCDisassembler::Fail;
3946 case ARM::tADR:
3947 break; // tADR does not explicitly represent the PC as an operand.
3948 case ARM::tADDrSPi:
3949 Inst.addOperand(MCOperand::createReg(ARM::SP));
3950 break;
3951 }
3952
3953 Inst.addOperand(MCOperand::createImm(imm));
3954 return S;
3955}
3956
3957static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
3958 uint64_t Address,
3959 const MCDisassembler *Decoder) {
3960 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<12>(Val<<1) + 4,
3961 true, 2, Inst, Decoder))
3962 Inst.addOperand(MCOperand::createImm(SignExtend32<12>(Val << 1)));
3963 return MCDisassembler::Success;
3964}
3965
3966static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
3967 uint64_t Address,
3968 const MCDisassembler *Decoder) {
3969 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<21>(Val) + 4,
3970 true, 4, Inst, Decoder))
3971 Inst.addOperand(MCOperand::createImm(SignExtend32<21>(Val)));
3972 return MCDisassembler::Success;
3973}
3974
3975static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
3976 uint64_t Address,
3977 const MCDisassembler *Decoder) {
3978 if (!tryAddingSymbolicOperand(Address, Address + (Val<<1) + 4,
3979 true, 2, Inst, Decoder))
3980 Inst.addOperand(MCOperand::createImm(Val << 1));
3981 return MCDisassembler::Success;
3982}
3983
3984static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
3985 uint64_t Address,
3986 const MCDisassembler *Decoder) {
3987 DecodeStatus S = MCDisassembler::Success;
3988
3989 unsigned Rn = fieldFromInstruction(Val, 0, 3);
3990 unsigned Rm = fieldFromInstruction(Val, 3, 3);
3991
3992 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
3993 return MCDisassembler::Fail;
3994 if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder)))
3995 return MCDisassembler::Fail;
3996
3997 return S;
3998}
3999
4000static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
4001 uint64_t Address,
4002 const MCDisassembler *Decoder) {
4003 DecodeStatus S = MCDisassembler::Success;
4004
4005 unsigned Rn = fieldFromInstruction(Val, 0, 3);
4006 unsigned imm = fieldFromInstruction(Val, 3, 5);
4007
4008 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
4009 return MCDisassembler::Fail;
4010 Inst.addOperand(MCOperand::createImm(imm));
4011
4012 return S;
4013}
4014
4015static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
4016 uint64_t Address,
4017 const MCDisassembler *Decoder) {
4018 unsigned imm = Val << 2;
4019
4020 Inst.addOperand(MCOperand::createImm(imm));
4021 tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder);
4022
4023 return MCDisassembler::Success;
4024}
4025
4026static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
4027 uint64_t Address,
4028 const MCDisassembler *Decoder) {
4029 Inst.addOperand(MCOperand::createReg(ARM::SP));
4030 Inst.addOperand(MCOperand::createImm(Val));
4031
4032 return MCDisassembler::Success;
4033}
4034
4035static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
4036 uint64_t Address,
4037 const MCDisassembler *Decoder) {
4038 DecodeStatus S = MCDisassembler::Success;
4039
4040 unsigned Rn = fieldFromInstruction(Val, 6, 4);
4041 unsigned Rm = fieldFromInstruction(Val, 2, 4);
4042 unsigned imm = fieldFromInstruction(Val, 0, 2);
4043
4044 // Thumb stores cannot use PC as dest register.
4045 switch (Inst.getOpcode()) {
4046 case ARM::t2STRHs:
4047 case ARM::t2STRBs:
4048 case ARM::t2STRs:
4049 if (Rn == 15)
4050 return MCDisassembler::Fail;
4051 break;
4052 default:
4053 break;
4054 }
4055
4056 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4057 return MCDisassembler::Fail;
4058 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
4059 return MCDisassembler::Fail;
4060 Inst.addOperand(MCOperand::createImm(imm));
4061
4062 return S;
4063}
4064
4065static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Insn,
4066 uint64_t Address,
4067 const MCDisassembler *Decoder) {
4068 DecodeStatus S = MCDisassembler::Success;
4069
4070 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4071 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4072
4073 const FeatureBitset &featureBits =
4074 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4075
4076 bool hasMP = featureBits[ARM::FeatureMP];
4077 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4078
4079 if (Rn == 15) {
4080 switch (Inst.getOpcode()) {
4081 case ARM::t2LDRBs:
4082 Inst.setOpcode(ARM::t2LDRBpci);
4083 break;
4084 case ARM::t2LDRHs:
4085 Inst.setOpcode(ARM::t2LDRHpci);
4086 break;
4087 case ARM::t2LDRSHs:
4088 Inst.setOpcode(ARM::t2LDRSHpci);
4089 break;
4090 case ARM::t2LDRSBs:
4091 Inst.setOpcode(ARM::t2LDRSBpci);
4092 break;
4093 case ARM::t2LDRs:
4094 Inst.setOpcode(ARM::t2LDRpci);
4095 break;
4096 case ARM::t2PLDs:
4097 Inst.setOpcode(ARM::t2PLDpci);
4098 break;
4099 case ARM::t2PLIs:
4100 Inst.setOpcode(ARM::t2PLIpci);
4101 break;
4102 default:
4103 return MCDisassembler::Fail;
4104 }
4105
4106 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4107 }
4108
4109 if (Rt == 15) {
4110 switch (Inst.getOpcode()) {
4111 case ARM::t2LDRSHs:
4112 return MCDisassembler::Fail;
4113 case ARM::t2LDRHs:
4114 Inst.setOpcode(ARM::t2PLDWs);
4115 break;
4116 case ARM::t2LDRSBs:
4117 Inst.setOpcode(ARM::t2PLIs);
4118 break;
4119 default:
4120 break;
4121 }
4122 }
4123
4124 switch (Inst.getOpcode()) {
4125 case ARM::t2PLDs:
4126 break;
4127 case ARM::t2PLIs:
4128 if (!hasV7Ops)
4129 return MCDisassembler::Fail;
4130 break;
4131 case ARM::t2PLDWs:
4132 if (!hasV7Ops || !hasMP)
4133 return MCDisassembler::Fail;
4134 break;
4135 default:
4136 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4137 return MCDisassembler::Fail;
4138 }
4139
4140 unsigned addrmode = fieldFromInstruction(Insn, 4, 2);
4141 addrmode |= fieldFromInstruction(Insn, 0, 4) << 2;
4142 addrmode |= fieldFromInstruction(Insn, 16, 4) << 6;
4143 if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder)))
4144 return MCDisassembler::Fail;
4145
4146 return S;
4147}
4148
4149static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
4150 uint64_t Address,
4151 const MCDisassembler *Decoder) {
4152 DecodeStatus S = MCDisassembler::Success;
4153
4154 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4155 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4156 unsigned U = fieldFromInstruction(Insn, 9, 1);
4157 unsigned imm = fieldFromInstruction(Insn, 0, 8);
4158 imm |= (U << 8);
4159 imm |= (Rn << 9);
4160 unsigned add = fieldFromInstruction(Insn, 9, 1);
4161
4162 const FeatureBitset &featureBits =
4163 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4164
4165 bool hasMP = featureBits[ARM::FeatureMP];
4166 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4167
4168 if (Rn == 15) {
4169 switch (Inst.getOpcode()) {
4170 case ARM::t2LDRi8:
4171 Inst.setOpcode(ARM::t2LDRpci);
4172 break;
4173 case ARM::t2LDRBi8:
4174 Inst.setOpcode(ARM::t2LDRBpci);
4175 break;
4176 case ARM::t2LDRSBi8:
4177 Inst.setOpcode(ARM::t2LDRSBpci);
4178 break;
4179 case ARM::t2LDRHi8:
4180 Inst.setOpcode(ARM::t2LDRHpci);
4181 break;
4182 case ARM::t2LDRSHi8:
4183 Inst.setOpcode(ARM::t2LDRSHpci);
4184 break;
4185 case ARM::t2PLDi8:
4186 Inst.setOpcode(ARM::t2PLDpci);
4187 break;
4188 case ARM::t2PLIi8:
4189 Inst.setOpcode(ARM::t2PLIpci);
4190 break;
4191 default:
4192 return MCDisassembler::Fail;
4193 }
4194 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4195 }
4196
4197 if (Rt == 15) {
4198 switch (Inst.getOpcode()) {
4199 case ARM::t2LDRSHi8:
4200 return MCDisassembler::Fail;
4201 case ARM::t2LDRHi8:
4202 if (!add)
4203 Inst.setOpcode(ARM::t2PLDWi8);
4204 break;
4205 case ARM::t2LDRSBi8:
4206 Inst.setOpcode(ARM::t2PLIi8);
4207 break;
4208 default:
4209 break;
4210 }
4211 }
4212
4213 switch (Inst.getOpcode()) {
4214 case ARM::t2PLDi8:
4215 break;
4216 case ARM::t2PLIi8:
4217 if (!hasV7Ops)
4218 return MCDisassembler::Fail;
4219 break;
4220 case ARM::t2PLDWi8:
4221 if (!hasV7Ops || !hasMP)
4222 return MCDisassembler::Fail;
4223 break;
4224 default:
4225 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4226 return MCDisassembler::Fail;
4227 }
4228
4229 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
4230 return MCDisassembler::Fail;
4231 return S;
4232}
4233
4234static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
4235 uint64_t Address,
4236 const MCDisassembler *Decoder) {
4237 DecodeStatus S = MCDisassembler::Success;
4238
4239 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4240 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4241 unsigned imm = fieldFromInstruction(Insn, 0, 12);
4242 imm |= (Rn << 13);
4243
4244 const FeatureBitset &featureBits =
4245 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4246
4247 bool hasMP = featureBits[ARM::FeatureMP];
4248 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4249
4250 if (Rn == 15) {
4251 switch (Inst.getOpcode()) {
4252 case ARM::t2LDRi12:
4253 Inst.setOpcode(ARM::t2LDRpci);
4254 break;
4255 case ARM::t2LDRHi12:
4256 Inst.setOpcode(ARM::t2LDRHpci);
4257 break;
4258 case ARM::t2LDRSHi12:
4259 Inst.setOpcode(ARM::t2LDRSHpci);
4260 break;
4261 case ARM::t2LDRBi12:
4262 Inst.setOpcode(ARM::t2LDRBpci);
4263 break;
4264 case ARM::t2LDRSBi12:
4265 Inst.setOpcode(ARM::t2LDRSBpci);
4266 break;
4267 case ARM::t2PLDi12:
4268 Inst.setOpcode(ARM::t2PLDpci);
4269 break;
4270 case ARM::t2PLIi12:
4271 Inst.setOpcode(ARM::t2PLIpci);
4272 break;
4273 default:
4274 return MCDisassembler::Fail;
4275 }
4276 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4277 }
4278
4279 if (Rt == 15) {
4280 switch (Inst.getOpcode()) {
4281 case ARM::t2LDRSHi12:
4282 return MCDisassembler::Fail;
4283 case ARM::t2LDRHi12:
4284 Inst.setOpcode(ARM::t2PLDWi12);
4285 break;
4286 case ARM::t2LDRSBi12:
4287 Inst.setOpcode(ARM::t2PLIi12);
4288 break;
4289 default:
4290 break;
4291 }
4292 }
4293
4294 switch (Inst.getOpcode()) {
4295 case ARM::t2PLDi12:
4296 break;
4297 case ARM::t2PLIi12:
4298 if (!hasV7Ops)
4299 return MCDisassembler::Fail;
4300 break;
4301 case ARM::t2PLDWi12:
4302 if (!hasV7Ops || !hasMP)
4303 return MCDisassembler::Fail;
4304 break;
4305 default:
4306 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4307 return MCDisassembler::Fail;
4308 }
4309
4310 if (!Check(S, DecodeT2AddrModeImm12(Inst, imm, Address, Decoder)))
4311 return MCDisassembler::Fail;
4312 return S;
4313}
4314
4315static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn, uint64_t Address,
4316 const MCDisassembler *Decoder) {
4317 DecodeStatus S = MCDisassembler::Success;
4318
4319 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4320 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4321 unsigned imm = fieldFromInstruction(Insn, 0, 8);
4322 imm |= (Rn << 9);
4323
4324 if (Rn == 15) {
4325 switch (Inst.getOpcode()) {
4326 case ARM::t2LDRT:
4327 Inst.setOpcode(ARM::t2LDRpci);
4328 break;
4329 case ARM::t2LDRBT:
4330 Inst.setOpcode(ARM::t2LDRBpci);
4331 break;
4332 case ARM::t2LDRHT:
4333 Inst.setOpcode(ARM::t2LDRHpci);
4334 break;
4335 case ARM::t2LDRSBT:
4336 Inst.setOpcode(ARM::t2LDRSBpci);
4337 break;
4338 case ARM::t2LDRSHT:
4339 Inst.setOpcode(ARM::t2LDRSHpci);
4340 break;
4341 default:
4342 return MCDisassembler::Fail;
4343 }
4344 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4345 }
4346
4347 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
4348 return MCDisassembler::Fail;
4349 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
4350 return MCDisassembler::Fail;
4351 return S;
4352}
4353
4354static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
4355 uint64_t Address,
4356 const MCDisassembler *Decoder) {
4357 DecodeStatus S = MCDisassembler::Success;
4358
4359 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4360 unsigned U = fieldFromInstruction(Insn, 23, 1);
4361 int imm = fieldFromInstruction(Insn, 0, 12);
4362
4363 const FeatureBitset &featureBits =
4364 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4365
4366 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4367
4368 if (Rt == 15) {
4369 switch (Inst.getOpcode()) {
4370 case ARM::t2LDRBpci:
4371 case ARM::t2LDRHpci:
4372 Inst.setOpcode(ARM::t2PLDpci);
4373 break;
4374 case ARM::t2LDRSBpci:
4375 Inst.setOpcode(ARM::t2PLIpci);
4376 break;
4377 case ARM::t2LDRSHpci:
4378 return MCDisassembler::Fail;
4379 default:
4380 break;
4381 }
4382 }
4383
4384 switch(Inst.getOpcode()) {
4385 case ARM::t2PLDpci:
4386 break;
4387 case ARM::t2PLIpci:
4388 if (!hasV7Ops)
4389 return MCDisassembler::Fail;
4390 break;
4391 default:
4392 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4393 return MCDisassembler::Fail;
4394 }
4395
4396 if (!U) {
4397 // Special case for #-0.
4398 if (imm == 0)
4399 imm = INT32_MIN;
4400 else
4401 imm = -imm;
4402 }
4403 Inst.addOperand(MCOperand::createImm(imm));
4404
4405 return S;
4406}
4407
4408static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val, uint64_t Address,
4409 const MCDisassembler *Decoder) {
4410 if (Val == 0)
4411 Inst.addOperand(MCOperand::createImm(INT32_MIN));
4412 else {
4413 int imm = Val & 0xFF;
4414
4415 if (!(Val & 0x100)) imm *= -1;
4416 Inst.addOperand(MCOperand::createImm(imm * 4));
4417 }
4418
4419 return MCDisassembler::Success;
4420}
4421
4422static DecodeStatus DecodeT2Imm7S4(MCInst &Inst, unsigned Val, uint64_t Address,
4423 const MCDisassembler *Decoder) {
4424 if (Val == 0)
4425 Inst.addOperand(MCOperand::createImm(INT32_MIN));
4426 else {
4427 int imm = Val & 0x7F;
4428
4429 if (!(Val & 0x80))
4430 imm *= -1;
4431 Inst.addOperand(MCOperand::createImm(imm * 4));
4432 }
4433
4434 return MCDisassembler::Success;
4435}
4436
4437static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
4438 uint64_t Address,
4439 const MCDisassembler *Decoder) {
4440 DecodeStatus S = MCDisassembler::Success;
4441
4442 unsigned Rn = fieldFromInstruction(Val, 9, 4);
4443 unsigned imm = fieldFromInstruction(Val, 0, 9);
4444
4445 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4446 return MCDisassembler::Fail;
4447 if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder)))
4448 return MCDisassembler::Fail;
4449
4450 return S;
4451}
4452
4453static DecodeStatus DecodeT2AddrModeImm7s4(MCInst &Inst, unsigned Val,
4454 uint64_t Address,
4455 const MCDisassembler *Decoder) {
4456 DecodeStatus S = MCDisassembler::Success;
4457
4458 unsigned Rn = fieldFromInstruction(Val, 8, 4);
4459 unsigned imm = fieldFromInstruction(Val, 0, 8);
4460
4461 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4462 return MCDisassembler::Fail;
4463 if (!Check(S, DecodeT2Imm7S4(Inst, imm, Address, Decoder)))
4464 return MCDisassembler::Fail;
4465
4466 return S;
4467}
4468
4469static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst, unsigned Val,
4470 uint64_t Address,
4471 const MCDisassembler *Decoder) {
4472 DecodeStatus S = MCDisassembler::Success;
4473
4474 unsigned Rn = fieldFromInstruction(Val, 8, 4);
4475 unsigned imm = fieldFromInstruction(Val, 0, 8);
4476
4477 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4478 return MCDisassembler::Fail;
4479
4480 Inst.addOperand(MCOperand::createImm(imm));
4481
4482 return S;
4483}
4484
4485static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val, uint64_t Address,
4486 const MCDisassembler *Decoder) {
4487 int imm = Val & 0xFF;
4488 if (Val == 0)
4489 imm = INT32_MIN;
4490 else if (!(Val & 0x100))
4491 imm *= -1;
4492 Inst.addOperand(MCOperand::createImm(imm));
4493
4494 return MCDisassembler::Success;
4495}
4496
4497template <int shift>
4498static DecodeStatus DecodeT2Imm7(MCInst &Inst, unsigned Val, uint64_t Address,
4499 const MCDisassembler *Decoder) {
4500 int imm = Val & 0x7F;
4501 if (Val == 0)
4502 imm = INT32_MIN;
4503 else if (!(Val & 0x80))
4504 imm *= -1;
4505 if (imm != INT32_MIN)
4506 imm *= (1U << shift);
4507 Inst.addOperand(MCOperand::createImm(imm));
4508
4509 return MCDisassembler::Success;
4510}
4511
4512static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
4513 uint64_t Address,
4514 const MCDisassembler *Decoder) {
4515 DecodeStatus S = MCDisassembler::Success;
4516
4517 unsigned Rn = fieldFromInstruction(Val, 9, 4);
4518 unsigned imm = fieldFromInstruction(Val, 0, 9);
4519
4520 // Thumb stores cannot use PC as dest register.
4521 switch (Inst.getOpcode()) {
4522 case ARM::t2STRT:
4523 case ARM::t2STRBT:
4524 case ARM::t2STRHT:
4525 case ARM::t2STRi8:
4526 case ARM::t2STRHi8:
4527 case ARM::t2STRBi8:
4528 if (Rn == 15)
4529 return MCDisassembler::Fail;
4530 break;
4531 default:
4532 break;
4533 }
4534
4535 // Some instructions always use an additive offset.
4536 switch (Inst.getOpcode()) {
4537 case ARM::t2LDRT:
4538 case ARM::t2LDRBT:
4539 case ARM::t2LDRHT:
4540 case ARM::t2LDRSBT:
4541 case ARM::t2LDRSHT:
4542 case ARM::t2STRT:
4543 case ARM::t2STRBT:
4544 case ARM::t2STRHT:
4545 imm |= 0x100;
4546 break;
4547 default:
4548 break;
4549 }
4550
4551 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4552 return MCDisassembler::Fail;
4553 if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder)))
4554 return MCDisassembler::Fail;
4555
4556 return S;
4557}
4558
4559template <int shift>
4560static DecodeStatus DecodeTAddrModeImm7(MCInst &Inst, unsigned Val,
4561 uint64_t Address,
4562 const MCDisassembler *Decoder) {
4563 DecodeStatus S = MCDisassembler::Success;
4564
4565 unsigned Rn = fieldFromInstruction(Val, 8, 3);
4566 unsigned imm = fieldFromInstruction(Val, 0, 8);
4567
4568 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
4569 return MCDisassembler::Fail;
4570 if (!Check(S, DecodeT2Imm7<shift>(Inst, imm, Address, Decoder)))
4571 return MCDisassembler::Fail;
4572
4573 return S;
4574}
4575
4576template <int shift, int WriteBack>
4577static DecodeStatus DecodeT2AddrModeImm7(MCInst &Inst, unsigned Val,
4578 uint64_t Address,
4579 const MCDisassembler *Decoder) {
4580 DecodeStatus S = MCDisassembler::Success;
4581
4582 unsigned Rn = fieldFromInstruction(Val, 8, 4);
4583 unsigned imm = fieldFromInstruction(Val, 0, 8);
4584 if (WriteBack) {
4585 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
4586 return MCDisassembler::Fail;
4587 } else if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4588 return MCDisassembler::Fail;
4589 if (!Check(S, DecodeT2Imm7<shift>(Inst, imm, Address, Decoder)))
4590 return MCDisassembler::Fail;
4591
4592 return S;
4593}
4594
4595static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Insn,
4596 uint64_t Address,
4597 const MCDisassembler *Decoder) {
4598 DecodeStatus S = MCDisassembler::Success;
4599
4600 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4601 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4602 unsigned addr = fieldFromInstruction(Insn, 0, 8);
4603 addr |= fieldFromInstruction(Insn, 9, 1) << 8;
4604 addr |= Rn << 9;
4605 unsigned load = fieldFromInstruction(Insn, 20, 1);
4606
4607 if (Rn == 15) {
4608 switch (Inst.getOpcode()) {
4609 case ARM::t2LDR_PRE:
4610 case ARM::t2LDR_POST:
4611 Inst.setOpcode(ARM::t2LDRpci);
4612 break;
4613 case ARM::t2LDRB_PRE:
4614 case ARM::t2LDRB_POST:
4615 Inst.setOpcode(ARM::t2LDRBpci);
4616 break;
4617 case ARM::t2LDRH_PRE:
4618 case ARM::t2LDRH_POST:
4619 Inst.setOpcode(ARM::t2LDRHpci);
4620 break;
4621 case ARM::t2LDRSB_PRE:
4622 case ARM::t2LDRSB_POST:
4623 if (Rt == 15)
4624 Inst.setOpcode(ARM::t2PLIpci);
4625 else
4626 Inst.setOpcode(ARM::t2LDRSBpci);
4627 break;
4628 case ARM::t2LDRSH_PRE:
4629 case ARM::t2LDRSH_POST:
4630 Inst.setOpcode(ARM::t2LDRSHpci);
4631 break;
4632 default:
4633 return MCDisassembler::Fail;
4634 }
4635 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4636 }
4637
4638 if (!load) {
4639 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4640 return MCDisassembler::Fail;
4641 }
4642
4643 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4644 return MCDisassembler::Fail;
4645
4646 if (load) {
4647 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4648 return MCDisassembler::Fail;
4649 }
4650
4651 if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder)))
4652 return MCDisassembler::Fail;
4653
4654 return S;
4655}
4656
4657static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
4658 uint64_t Address,
4659 const MCDisassembler *Decoder) {
4660