LLVM 20.0.0git
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::endianness::big
140 : llvm::endianness::little;
141 }
142
143 ~ARMDisassembler() override = default;
144
145 DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
146 ArrayRef<uint8_t> Bytes, uint64_t Address,
147 raw_ostream &CStream) const override;
148
149 uint64_t suggestBytesToSkip(ArrayRef<uint8_t> Bytes,
150 uint64_t Address) const override;
151
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::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);
703static DecodeStatus DecodeLazyLoadStoreMul(MCInst &Inst, unsigned Insn,
704 uint64_t Address,
705 const MCDisassembler *Decoder);
706
707#include "ARMGenDisassemblerTables.inc"
708
709static MCDisassembler *createARMDisassembler(const Target &T,
710 const MCSubtargetInfo &STI,
711 MCContext &Ctx) {
712 return new ARMDisassembler(STI, Ctx, T.createMCInstrInfo());
713}
714
715// Post-decoding checks
716static DecodeStatus checkDecodedInstruction(MCInst &MI, uint64_t &Size,
717 uint64_t Address, raw_ostream &CS,
718 uint32_t Insn,
719 DecodeStatus Result) {
720 switch (MI.getOpcode()) {
721 case ARM::HVC: {
722 // HVC is undefined if condition = 0xf otherwise upredictable
723 // if condition != 0xe
724 uint32_t Cond = (Insn >> 28) & 0xF;
725 if (Cond == 0xF)
726 return MCDisassembler::Fail;
727 if (Cond != 0xE)
728 return MCDisassembler::SoftFail;
729 return Result;
730 }
731 case ARM::t2ADDri:
732 case ARM::t2ADDri12:
733 case ARM::t2ADDrr:
734 case ARM::t2ADDrs:
735 case ARM::t2SUBri:
736 case ARM::t2SUBri12:
737 case ARM::t2SUBrr:
738 case ARM::t2SUBrs:
739 if (MI.getOperand(0).getReg() == ARM::SP &&
740 MI.getOperand(1).getReg() != ARM::SP)
741 return MCDisassembler::SoftFail;
742 return Result;
743 default: return Result;
744 }
745}
746
747uint64_t ARMDisassembler::suggestBytesToSkip(ArrayRef<uint8_t> Bytes,
748 uint64_t Address) const {
749 // In Arm state, instructions are always 4 bytes wide, so there's no
750 // point in skipping any smaller number of bytes if an instruction
751 // can't be decoded.
752 if (!STI.hasFeature(ARM::ModeThumb))
753 return 4;
754
755 // In a Thumb instruction stream, a halfword is a standalone 2-byte
756 // instruction if and only if its value is less than 0xE800.
757 // Otherwise, it's the first halfword of a 4-byte instruction.
758 //
759 // So, if we can see the upcoming halfword, we can judge on that
760 // basis, and maybe skip a whole 4-byte instruction that we don't
761 // know how to decode, without accidentally trying to interpret its
762 // second half as something else.
763 //
764 // If we don't have the instruction data available, we just have to
765 // recommend skipping the minimum sensible distance, which is 2
766 // bytes.
767 if (Bytes.size() < 2)
768 return 2;
769
770 uint16_t Insn16 = llvm::support::endian::read<uint16_t>(
771 Bytes.data(), InstructionEndianness);
772 return Insn16 < 0xE800 ? 2 : 4;
773}
774
775DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
776 ArrayRef<uint8_t> Bytes,
777 uint64_t Address,
778 raw_ostream &CS) const {
779 if (STI.hasFeature(ARM::ModeThumb))
780 return getThumbInstruction(MI, Size, Bytes, Address, CS);
781 return getARMInstruction(MI, Size, Bytes, Address, CS);
782}
783
784DecodeStatus ARMDisassembler::getARMInstruction(MCInst &MI, uint64_t &Size,
785 ArrayRef<uint8_t> Bytes,
786 uint64_t Address,
787 raw_ostream &CS) const {
788 CommentStream = &CS;
789
790 assert(!STI.hasFeature(ARM::ModeThumb) &&
791 "Asked to disassemble an ARM instruction but Subtarget is in Thumb "
792 "mode!");
793
794 // We want to read exactly 4 bytes of data.
795 if (Bytes.size() < 4) {
796 Size = 0;
797 return MCDisassembler::Fail;
798 }
799
800 // Encoded as a 32-bit word in the stream.
801 uint32_t Insn = llvm::support::endian::read<uint32_t>(Bytes.data(),
802 InstructionEndianness);
803
804 // Calling the auto-generated decoder function.
805 DecodeStatus Result =
806 decodeInstruction(DecoderTableARM32, MI, Insn, Address, this, STI);
807 if (Result != MCDisassembler::Fail) {
808 Size = 4;
809 return checkDecodedInstruction(MI, Size, Address, CS, Insn, Result);
810 }
811
812 struct DecodeTable {
813 const uint8_t *P;
814 bool DecodePred;
815 };
816
817 const DecodeTable Tables[] = {
818 {DecoderTableVFP32, false}, {DecoderTableVFPV832, false},
819 {DecoderTableNEONData32, true}, {DecoderTableNEONLoadStore32, true},
820 {DecoderTableNEONDup32, true}, {DecoderTablev8NEON32, false},
821 {DecoderTablev8Crypto32, false},
822 };
823
824 for (auto Table : Tables) {
825 Result = decodeInstruction(Table.P, MI, Insn, Address, this, STI);
826 if (Result != MCDisassembler::Fail) {
827 Size = 4;
828 // Add a fake predicate operand, because we share these instruction
829 // definitions with Thumb2 where these instructions are predicable.
830 if (Table.DecodePred && !DecodePredicateOperand(MI, 0xE, Address, this))
831 return MCDisassembler::Fail;
832 return Result;
833 }
834 }
835
836 Result =
837 decodeInstruction(DecoderTableCoProc32, MI, Insn, Address, this, STI);
838 if (Result != MCDisassembler::Fail) {
839 Size = 4;
840 return checkDecodedInstruction(MI, Size, Address, CS, Insn, Result);
841 }
842
843 Size = 4;
844 return MCDisassembler::Fail;
845}
846
847/// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the
848/// immediate Value in the MCInst. The immediate Value has had any PC
849/// adjustment made by the caller. If the instruction is a branch instruction
850/// then isBranch is true, else false. If the getOpInfo() function was set as
851/// part of the setupForSymbolicDisassembly() call then that function is called
852/// to get any symbolic information at the Address for this instruction. If
853/// that returns non-zero then the symbolic information it returns is used to
854/// create an MCExpr and that is added as an operand to the MCInst. If
855/// getOpInfo() returns zero and isBranch is true then a symbol look up for
856/// Value is done and if a symbol is found an MCExpr is created with that, else
857/// an MCExpr with Value is created. This function returns true if it adds an
858/// operand to the MCInst and false otherwise.
859static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value,
860 bool isBranch, uint64_t InstSize,
861 MCInst &MI,
862 const MCDisassembler *Decoder) {
863 // FIXME: Does it make sense for value to be negative?
864 return Decoder->tryAddingSymbolicOperand(MI, (uint32_t)Value, Address,
865 isBranch, /*Offset=*/0, /*OpSize=*/0,
866 InstSize);
867}
868
869/// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being
870/// referenced by a load instruction with the base register that is the Pc.
871/// These can often be values in a literal pool near the Address of the
872/// instruction. The Address of the instruction and its immediate Value are
873/// used as a possible literal pool entry. The SymbolLookUp call back will
874/// return the name of a symbol referenced by the literal pool's entry if
875/// the referenced address is that of a symbol. Or it will return a pointer to
876/// a literal 'C' string if the referenced address of the literal pool's entry
877/// is an address into a section with 'C' string literals.
878static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value,
879 const MCDisassembler *Decoder) {
880 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
881 Dis->tryAddingPcLoadReferenceComment(Value, Address);
882}
883
884// Thumb1 instructions don't have explicit S bits. Rather, they
885// implicitly set CPSR. Since it's not represented in the encoding, the
886// auto-generated decoder won't inject the CPSR operand. We need to fix
887// that as a post-pass.
888void ARMDisassembler::AddThumb1SBit(MCInst &MI, bool InITBlock) const {
889 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
890 MCInst::iterator I = MI.begin();
891 for (unsigned i = 0; i < MCID.NumOperands; ++i, ++I) {
892 if (I == MI.end()) break;
893 if (MCID.operands()[i].isOptionalDef() &&
894 MCID.operands()[i].RegClass == ARM::CCRRegClassID) {
895 if (i > 0 && MCID.operands()[i - 1].isPredicate())
896 continue;
897 MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR));
898 return;
899 }
900 }
901
902 MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR));
903}
904
905bool ARMDisassembler::isVectorPredicable(const MCInst &MI) const {
906 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
907 for (unsigned i = 0; i < MCID.NumOperands; ++i) {
908 if (ARM::isVpred(MCID.operands()[i].OperandType))
909 return true;
910 }
911 return false;
912}
913
914// Most Thumb instructions don't have explicit predicates in the
915// encoding, but rather get their predicates from IT context. We need
916// to fix up the predicate operands using this context information as a
917// post-pass.
918MCDisassembler::DecodeStatus
919ARMDisassembler::AddThumbPredicate(MCInst &MI) const {
920 MCDisassembler::DecodeStatus S = Success;
921
922 const FeatureBitset &FeatureBits = getSubtargetInfo().getFeatureBits();
923
924 // A few instructions actually have predicates encoded in them. Don't
925 // try to overwrite it if we're seeing one of those.
926 switch (MI.getOpcode()) {
927 case ARM::tBcc:
928 case ARM::t2Bcc:
929 case ARM::tCBZ:
930 case ARM::tCBNZ:
931 case ARM::tCPS:
932 case ARM::t2CPS3p:
933 case ARM::t2CPS2p:
934 case ARM::t2CPS1p:
935 case ARM::t2CSEL:
936 case ARM::t2CSINC:
937 case ARM::t2CSINV:
938 case ARM::t2CSNEG:
939 case ARM::tMOVSr:
940 case ARM::tSETEND:
941 // Some instructions (mostly conditional branches) are not
942 // allowed in IT blocks.
943 if (ITBlock.instrInITBlock())
944 S = SoftFail;
945 else
946 return Success;
947 break;
948 case ARM::t2HINT:
949 if (MI.getOperand(0).getImm() == 0x10 && (FeatureBits[ARM::FeatureRAS]) != 0)
950 S = SoftFail;
951 break;
952 case ARM::tB:
953 case ARM::t2B:
954 case ARM::t2TBB:
955 case ARM::t2TBH:
956 // Some instructions (mostly unconditional branches) can
957 // only appears at the end of, or outside of, an IT.
958 if (ITBlock.instrInITBlock() && !ITBlock.instrLastInITBlock())
959 S = SoftFail;
960 break;
961 default:
962 break;
963 }
964
965 // Warn on non-VPT predicable instruction in a VPT block and a VPT
966 // predicable instruction in an IT block
967 if ((!isVectorPredicable(MI) && VPTBlock.instrInVPTBlock()) ||
968 (isVectorPredicable(MI) && ITBlock.instrInITBlock()))
969 S = SoftFail;
970
971 // If we're in an IT/VPT block, base the predicate on that. Otherwise,
972 // assume a predicate of AL.
973 unsigned CC = ARMCC::AL;
974 unsigned VCC = ARMVCC::None;
975 if (ITBlock.instrInITBlock()) {
976 CC = ITBlock.getITCC();
977 ITBlock.advanceITState();
978 } else if (VPTBlock.instrInVPTBlock()) {
979 VCC = VPTBlock.getVPTPred();
980 VPTBlock.advanceVPTState();
981 }
982
983 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
984
985 MCInst::iterator CCI = MI.begin();
986 for (unsigned i = 0; i < MCID.NumOperands; ++i, ++CCI) {
987 if (MCID.operands()[i].isPredicate() || CCI == MI.end())
988 break;
989 }
990
991 if (MCID.isPredicable()) {
992 CCI = MI.insert(CCI, MCOperand::createImm(CC));
993 ++CCI;
994 if (CC == ARMCC::AL)
995 MI.insert(CCI, MCOperand::createReg(0));
996 else
997 MI.insert(CCI, MCOperand::createReg(ARM::CPSR));
998 } else if (CC != ARMCC::AL) {
999 Check(S, SoftFail);
1000 }
1001
1002 MCInst::iterator VCCI = MI.begin();
1003 unsigned VCCPos;
1004 for (VCCPos = 0; VCCPos < MCID.NumOperands; ++VCCPos, ++VCCI) {
1005 if (ARM::isVpred(MCID.operands()[VCCPos].OperandType) || VCCI == MI.end())
1006 break;
1007 }
1008
1009 if (isVectorPredicable(MI)) {
1010 VCCI = MI.insert(VCCI, MCOperand::createImm(VCC));
1011 ++VCCI;
1012 if (VCC == ARMVCC::None)
1013 VCCI = MI.insert(VCCI, MCOperand::createReg(0));
1014 else
1015 VCCI = MI.insert(VCCI, MCOperand::createReg(ARM::P0));
1016 ++VCCI;
1017 VCCI = MI.insert(VCCI, MCOperand::createReg(0));
1018 ++VCCI;
1019 if (MCID.operands()[VCCPos].OperandType == ARM::OPERAND_VPRED_R) {
1020 int TiedOp = MCID.getOperandConstraint(VCCPos + 3, MCOI::TIED_TO);
1021 assert(TiedOp >= 0 &&
1022 "Inactive register in vpred_r is not tied to an output!");
1023 // Copy the operand to ensure it's not invalidated when MI grows.
1024 MI.insert(VCCI, MCOperand(MI.getOperand(TiedOp)));
1025 }
1026 } else if (VCC != ARMVCC::None) {
1027 Check(S, SoftFail);
1028 }
1029
1030 return S;
1031}
1032
1033// Thumb VFP instructions are a special case. Because we share their
1034// encodings between ARM and Thumb modes, and they are predicable in ARM
1035// mode, the auto-generated decoder will give them an (incorrect)
1036// predicate operand. We need to rewrite these operands based on the IT
1037// context as a post-pass.
1038void ARMDisassembler::UpdateThumbVFPPredicate(
1039 DecodeStatus &S, MCInst &MI) const {
1040 unsigned CC;
1041 CC = ITBlock.getITCC();
1042 if (CC == 0xF)
1043 CC = ARMCC::AL;
1044 if (ITBlock.instrInITBlock())
1045 ITBlock.advanceITState();
1046 else if (VPTBlock.instrInVPTBlock()) {
1047 CC = VPTBlock.getVPTPred();
1048 VPTBlock.advanceVPTState();
1049 }
1050
1051 const MCInstrDesc &MCID = MCII->get(MI.getOpcode());
1052 ArrayRef<MCOperandInfo> OpInfo = MCID.operands();
1053 MCInst::iterator I = MI.begin();
1054 unsigned short NumOps = MCID.NumOperands;
1055 for (unsigned i = 0; i < NumOps; ++i, ++I) {
1056 if (OpInfo[i].isPredicate() ) {
1057 if (CC != ARMCC::AL && !MCID.isPredicable())
1058 Check(S, SoftFail);
1059 I->setImm(CC);
1060 ++I;
1061 if (CC == ARMCC::AL)
1062 I->setReg(0);
1063 else
1064 I->setReg(ARM::CPSR);
1065 return;
1066 }
1067 }
1068}
1069
1070DecodeStatus ARMDisassembler::getThumbInstruction(MCInst &MI, uint64_t &Size,
1071 ArrayRef<uint8_t> Bytes,
1072 uint64_t Address,
1073 raw_ostream &CS) const {
1074 CommentStream = &CS;
1075
1076 assert(STI.hasFeature(ARM::ModeThumb) &&
1077 "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!");
1078
1079 // We want to read exactly 2 bytes of data.
1080 if (Bytes.size() < 2) {
1081 Size = 0;
1082 return MCDisassembler::Fail;
1083 }
1084
1085 uint16_t Insn16 = llvm::support::endian::read<uint16_t>(
1086 Bytes.data(), InstructionEndianness);
1087 DecodeStatus Result =
1088 decodeInstruction(DecoderTableThumb16, MI, Insn16, Address, this, STI);
1089 if (Result != MCDisassembler::Fail) {
1090 Size = 2;
1091 Check(Result, AddThumbPredicate(MI));
1092 return Result;
1093 }
1094
1095 Result = decodeInstruction(DecoderTableThumbSBit16, MI, Insn16, Address, this,
1096 STI);
1097 if (Result) {
1098 Size = 2;
1099 bool InITBlock = ITBlock.instrInITBlock();
1100 Check(Result, AddThumbPredicate(MI));
1101 AddThumb1SBit(MI, InITBlock);
1102 return Result;
1103 }
1104
1105 Result =
1106 decodeInstruction(DecoderTableThumb216, MI, Insn16, Address, this, STI);
1107 if (Result != MCDisassembler::Fail) {
1108 Size = 2;
1109
1110 // Nested IT blocks are UNPREDICTABLE. Must be checked before we add
1111 // the Thumb predicate.
1112 if (MI.getOpcode() == ARM::t2IT && ITBlock.instrInITBlock())
1113 Result = MCDisassembler::SoftFail;
1114
1115 Check(Result, AddThumbPredicate(MI));
1116
1117 // If we find an IT instruction, we need to parse its condition
1118 // code and mask operands so that we can apply them correctly
1119 // to the subsequent instructions.
1120 if (MI.getOpcode() == ARM::t2IT) {
1121 unsigned Firstcond = MI.getOperand(0).getImm();
1122 unsigned Mask = MI.getOperand(1).getImm();
1123 ITBlock.setITState(Firstcond, Mask);
1124
1125 // An IT instruction that would give a 'NV' predicate is unpredictable.
1126 if (Firstcond == ARMCC::AL && !isPowerOf2_32(Mask))
1127 CS << "unpredictable IT predicate sequence";
1128 }
1129
1130 return Result;
1131 }
1132
1133 // We want to read exactly 4 bytes of data.
1134 if (Bytes.size() < 4) {
1135 Size = 0;
1136 return MCDisassembler::Fail;
1137 }
1138
1139 uint32_t Insn32 =
1140 (uint32_t(Insn16) << 16) | llvm::support::endian::read<uint16_t>(
1141 Bytes.data() + 2, InstructionEndianness);
1142
1143 Result =
1144 decodeInstruction(DecoderTableMVE32, MI, Insn32, Address, this, STI);
1145 if (Result != MCDisassembler::Fail) {
1146 Size = 4;
1147
1148 // Nested VPT blocks are UNPREDICTABLE. Must be checked before we add
1149 // the VPT predicate.
1150 if (isVPTOpcode(MI.getOpcode()) && VPTBlock.instrInVPTBlock())
1151 Result = MCDisassembler::SoftFail;
1152
1153 Check(Result, AddThumbPredicate(MI));
1154
1155 if (isVPTOpcode(MI.getOpcode())) {
1156 unsigned Mask = MI.getOperand(0).getImm();
1157 VPTBlock.setVPTState(Mask);
1158 }
1159
1160 return Result;
1161 }
1162
1163 Result =
1164 decodeInstruction(DecoderTableThumb32, MI, Insn32, Address, this, STI);
1165 if (Result != MCDisassembler::Fail) {
1166 Size = 4;
1167 bool InITBlock = ITBlock.instrInITBlock();
1168 Check(Result, AddThumbPredicate(MI));
1169 AddThumb1SBit(MI, InITBlock);
1170 return Result;
1171 }
1172
1173 Result =
1174 decodeInstruction(DecoderTableThumb232, MI, Insn32, Address, this, STI);
1175 if (Result != MCDisassembler::Fail) {
1176 Size = 4;
1177 Check(Result, AddThumbPredicate(MI));
1178 return checkDecodedInstruction(MI, Size, Address, CS, Insn32, Result);
1179 }
1180
1181 if (fieldFromInstruction(Insn32, 28, 4) == 0xE) {
1182 Result =
1183 decodeInstruction(DecoderTableVFP32, MI, Insn32, Address, this, STI);
1184 if (Result != MCDisassembler::Fail) {
1185 Size = 4;
1186 UpdateThumbVFPPredicate(Result, MI);
1187 return Result;
1188 }
1189 }
1190
1191 Result =
1192 decodeInstruction(DecoderTableVFPV832, MI, Insn32, Address, this, STI);
1193 if (Result != MCDisassembler::Fail) {
1194 Size = 4;
1195 return Result;
1196 }
1197
1198 if (fieldFromInstruction(Insn32, 28, 4) == 0xE) {
1199 Result = decodeInstruction(DecoderTableNEONDup32, MI, Insn32, Address, this,
1200 STI);
1201 if (Result != MCDisassembler::Fail) {
1202 Size = 4;
1203 Check(Result, AddThumbPredicate(MI));
1204 return Result;
1205 }
1206 }
1207
1208 if (fieldFromInstruction(Insn32, 24, 8) == 0xF9) {
1209 uint32_t NEONLdStInsn = Insn32;
1210 NEONLdStInsn &= 0xF0FFFFFF;
1211 NEONLdStInsn |= 0x04000000;
1212 Result = decodeInstruction(DecoderTableNEONLoadStore32, MI, NEONLdStInsn,
1213 Address, this, STI);
1214 if (Result != MCDisassembler::Fail) {
1215 Size = 4;
1216 Check(Result, AddThumbPredicate(MI));
1217 return Result;
1218 }
1219 }
1220
1221 if (fieldFromInstruction(Insn32, 24, 4) == 0xF) {
1222 uint32_t NEONDataInsn = Insn32;
1223 NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24
1224 NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
1225 NEONDataInsn |= 0x12000000; // Set bits 28 and 25
1226 Result = decodeInstruction(DecoderTableNEONData32, MI, NEONDataInsn,
1227 Address, this, STI);
1228 if (Result != MCDisassembler::Fail) {
1229 Size = 4;
1230 Check(Result, AddThumbPredicate(MI));
1231 return Result;
1232 }
1233
1234 uint32_t NEONCryptoInsn = Insn32;
1235 NEONCryptoInsn &= 0xF0FFFFFF; // Clear bits 27-24
1236 NEONCryptoInsn |= (NEONCryptoInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
1237 NEONCryptoInsn |= 0x12000000; // Set bits 28 and 25
1238 Result = decodeInstruction(DecoderTablev8Crypto32, MI, NEONCryptoInsn,
1239 Address, this, STI);
1240 if (Result != MCDisassembler::Fail) {
1241 Size = 4;
1242 return Result;
1243 }
1244
1245 uint32_t NEONv8Insn = Insn32;
1246 NEONv8Insn &= 0xF3FFFFFF; // Clear bits 27-26
1247 Result = decodeInstruction(DecoderTablev8NEON32, MI, NEONv8Insn, Address,
1248 this, STI);
1249 if (Result != MCDisassembler::Fail) {
1250 Size = 4;
1251 return Result;
1252 }
1253 }
1254
1255 uint32_t Coproc = fieldFromInstruction(Insn32, 8, 4);
1256 const uint8_t *DecoderTable = ARM::isCDECoproc(Coproc, STI)
1257 ? DecoderTableThumb2CDE32
1258 : DecoderTableThumb2CoProc32;
1259 Result =
1260 decodeInstruction(DecoderTable, MI, Insn32, Address, this, STI);
1261 if (Result != MCDisassembler::Fail) {
1262 Size = 4;
1263 Check(Result, AddThumbPredicate(MI));
1264 return Result;
1265 }
1266
1267 Size = 0;
1268 return MCDisassembler::Fail;
1269}
1270
1271extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMDisassembler() {
1272 TargetRegistry::RegisterMCDisassembler(getTheARMLETarget(),
1273 createARMDisassembler);
1274 TargetRegistry::RegisterMCDisassembler(getTheARMBETarget(),
1275 createARMDisassembler);
1276 TargetRegistry::RegisterMCDisassembler(getTheThumbLETarget(),
1277 createARMDisassembler);
1278 TargetRegistry::RegisterMCDisassembler(getTheThumbBETarget(),
1279 createARMDisassembler);
1280}
1281
1282static const uint16_t GPRDecoderTable[] = {
1283 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1284 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1285 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1286 ARM::R12, ARM::SP, ARM::LR, ARM::PC
1287};
1288
1289static const uint16_t CLRMGPRDecoderTable[] = {
1290 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
1291 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
1292 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
1293 ARM::R12, 0, ARM::LR, ARM::APSR
1294};
1295
1296static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1297 uint64_t Address,
1298 const MCDisassembler *Decoder) {
1299 if (RegNo > 15)
1300 return MCDisassembler::Fail;
1301
1302 unsigned Register = GPRDecoderTable[RegNo];
1303 Inst.addOperand(MCOperand::createReg(Register));
1304 return MCDisassembler::Success;
1305}
1306
1307static DecodeStatus DecodeCLRMGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1308 uint64_t Address,
1309 const MCDisassembler *Decoder) {
1310 if (RegNo > 15)
1311 return MCDisassembler::Fail;
1312
1313 unsigned Register = CLRMGPRDecoderTable[RegNo];
1314 if (Register == 0)
1315 return MCDisassembler::Fail;
1316
1317 Inst.addOperand(MCOperand::createReg(Register));
1318 return MCDisassembler::Success;
1319}
1320
1321static DecodeStatus DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo,
1322 uint64_t Address,
1323 const MCDisassembler *Decoder) {
1324 DecodeStatus S = MCDisassembler::Success;
1325
1326 if (RegNo == 15)
1327 S = MCDisassembler::SoftFail;
1328
1329 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1330
1331 return S;
1332}
1333
1334static DecodeStatus DecodeGPRnospRegisterClass(MCInst &Inst, unsigned RegNo,
1335 uint64_t Address,
1336 const MCDisassembler *Decoder) {
1337 DecodeStatus S = MCDisassembler::Success;
1338
1339 if (RegNo == 13)
1340 S = MCDisassembler::SoftFail;
1341
1342 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1343
1344 return S;
1345}
1346
1347static DecodeStatus
1348DecodeGPRwithAPSRRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1349 const MCDisassembler *Decoder) {
1350 DecodeStatus S = MCDisassembler::Success;
1351
1352 if (RegNo == 15)
1353 {
1354 Inst.addOperand(MCOperand::createReg(ARM::APSR_NZCV));
1355 return MCDisassembler::Success;
1356 }
1357
1358 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1359 return S;
1360}
1361
1362static DecodeStatus
1363DecodeGPRwithZRRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1364 const MCDisassembler *Decoder) {
1365 DecodeStatus S = MCDisassembler::Success;
1366
1367 if (RegNo == 15)
1368 {
1369 Inst.addOperand(MCOperand::createReg(ARM::ZR));
1370 return MCDisassembler::Success;
1371 }
1372
1373 if (RegNo == 13)
1374 Check(S, MCDisassembler::SoftFail);
1375
1376 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1377 return S;
1378}
1379
1380static DecodeStatus
1381DecodeGPRwithZRnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1382 const MCDisassembler *Decoder) {
1383 DecodeStatus S = MCDisassembler::Success;
1384 if (RegNo == 13)
1385 return MCDisassembler::Fail;
1386 Check(S, DecodeGPRwithZRRegisterClass(Inst, RegNo, Address, Decoder));
1387 return S;
1388}
1389
1390static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1391 uint64_t Address,
1392 const MCDisassembler *Decoder) {
1393 if (RegNo > 7)
1394 return MCDisassembler::Fail;
1395 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder);
1396}
1397
1398static const uint16_t GPRPairDecoderTable[] = {
1399 ARM::R0_R1, ARM::R2_R3, ARM::R4_R5, ARM::R6_R7,
1400 ARM::R8_R9, ARM::R10_R11, ARM::R12_SP
1401};
1402
1403static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
1404 uint64_t Address,
1405 const MCDisassembler *Decoder) {
1406 DecodeStatus S = MCDisassembler::Success;
1407
1408 // According to the Arm ARM RegNo = 14 is undefined, but we return fail
1409 // rather than SoftFail as there is no GPRPair table entry for index 7.
1410 if (RegNo > 13)
1411 return MCDisassembler::Fail;
1412
1413 if (RegNo & 1)
1414 S = MCDisassembler::SoftFail;
1415
1416 unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
1417 Inst.addOperand(MCOperand::createReg(RegisterPair));
1418 return S;
1419}
1420
1421static DecodeStatus
1422DecodeGPRPairnospRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1423 const MCDisassembler *Decoder) {
1424 if (RegNo > 13)
1425 return MCDisassembler::Fail;
1426
1427 unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
1428 Inst.addOperand(MCOperand::createReg(RegisterPair));
1429
1430 if ((RegNo & 1) || RegNo > 10)
1431 return MCDisassembler::SoftFail;
1432 return MCDisassembler::Success;
1433}
1434
1435static DecodeStatus DecodeGPRspRegisterClass(MCInst &Inst, unsigned RegNo,
1436 uint64_t Address,
1437 const MCDisassembler *Decoder) {
1438 if (RegNo != 13)
1439 return MCDisassembler::Fail;
1440
1441 unsigned Register = GPRDecoderTable[RegNo];
1442 Inst.addOperand(MCOperand::createReg(Register));
1443 return MCDisassembler::Success;
1444}
1445
1446static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1447 uint64_t Address,
1448 const MCDisassembler *Decoder) {
1449 unsigned Register = 0;
1450 switch (RegNo) {
1451 case 0:
1452 Register = ARM::R0;
1453 break;
1454 case 1:
1455 Register = ARM::R1;
1456 break;
1457 case 2:
1458 Register = ARM::R2;
1459 break;
1460 case 3:
1461 Register = ARM::R3;
1462 break;
1463 case 9:
1464 Register = ARM::R9;
1465 break;
1466 case 12:
1467 Register = ARM::R12;
1468 break;
1469 default:
1470 return MCDisassembler::Fail;
1471 }
1472
1473 Inst.addOperand(MCOperand::createReg(Register));
1474 return MCDisassembler::Success;
1475}
1476
1477static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
1478 uint64_t Address,
1479 const MCDisassembler *Decoder) {
1480 DecodeStatus S = MCDisassembler::Success;
1481
1482 const FeatureBitset &featureBits =
1483 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1484
1485 if ((RegNo == 13 && !featureBits[ARM::HasV8Ops]) || RegNo == 15)
1486 S = MCDisassembler::SoftFail;
1487
1488 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
1489 return S;
1490}
1491
1492static const uint16_t SPRDecoderTable[] = {
1493 ARM::S0, ARM::S1, ARM::S2, ARM::S3,
1494 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
1495 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
1496 ARM::S12, ARM::S13, ARM::S14, ARM::S15,
1497 ARM::S16, ARM::S17, ARM::S18, ARM::S19,
1498 ARM::S20, ARM::S21, ARM::S22, ARM::S23,
1499 ARM::S24, ARM::S25, ARM::S26, ARM::S27,
1500 ARM::S28, ARM::S29, ARM::S30, ARM::S31
1501};
1502
1503static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
1504 uint64_t Address,
1505 const MCDisassembler *Decoder) {
1506 if (RegNo > 31)
1507 return MCDisassembler::Fail;
1508
1509 unsigned Register = SPRDecoderTable[RegNo];
1510 Inst.addOperand(MCOperand::createReg(Register));
1511 return MCDisassembler::Success;
1512}
1513
1514static DecodeStatus DecodeHPRRegisterClass(MCInst &Inst, unsigned RegNo,
1515 uint64_t Address,
1516 const MCDisassembler *Decoder) {
1517 return DecodeSPRRegisterClass(Inst, RegNo, Address, Decoder);
1518}
1519
1520static const uint16_t DPRDecoderTable[] = {
1521 ARM::D0, ARM::D1, ARM::D2, ARM::D3,
1522 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
1523 ARM::D8, ARM::D9, ARM::D10, ARM::D11,
1524 ARM::D12, ARM::D13, ARM::D14, ARM::D15,
1525 ARM::D16, ARM::D17, ARM::D18, ARM::D19,
1526 ARM::D20, ARM::D21, ARM::D22, ARM::D23,
1527 ARM::D24, ARM::D25, ARM::D26, ARM::D27,
1528 ARM::D28, ARM::D29, ARM::D30, ARM::D31
1529};
1530
1531static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
1532 uint64_t Address,
1533 const MCDisassembler *Decoder) {
1534 const FeatureBitset &featureBits =
1535 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1536
1537 bool hasD32 = featureBits[ARM::FeatureD32];
1538
1539 if (RegNo > 31 || (!hasD32 && RegNo > 15))
1540 return MCDisassembler::Fail;
1541
1542 unsigned Register = DPRDecoderTable[RegNo];
1543 Inst.addOperand(MCOperand::createReg(Register));
1544 return MCDisassembler::Success;
1545}
1546
1547static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
1548 uint64_t Address,
1549 const MCDisassembler *Decoder) {
1550 if (RegNo > 7)
1551 return MCDisassembler::Fail;
1552 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1553}
1554
1555static DecodeStatus DecodeSPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
1556 uint64_t Address,
1557 const MCDisassembler *Decoder) {
1558 if (RegNo > 15)
1559 return MCDisassembler::Fail;
1560 return DecodeSPRRegisterClass(Inst, RegNo, Address, Decoder);
1561}
1562
1563static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo,
1564 uint64_t Address,
1565 const MCDisassembler *Decoder) {
1566 if (RegNo > 15)
1567 return MCDisassembler::Fail;
1568 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1569}
1570
1571static const uint16_t QPRDecoderTable[] = {
1572 ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3,
1573 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7,
1574 ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11,
1575 ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15
1576};
1577
1578static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
1579 uint64_t Address,
1580 const MCDisassembler *Decoder) {
1581 if (RegNo > 31 || (RegNo & 1) != 0)
1582 return MCDisassembler::Fail;
1583 RegNo >>= 1;
1584
1585 unsigned Register = QPRDecoderTable[RegNo];
1586 Inst.addOperand(MCOperand::createReg(Register));
1587 return MCDisassembler::Success;
1588}
1589
1590static const uint16_t DPairDecoderTable[] = {
1591 ARM::Q0, ARM::D1_D2, ARM::Q1, ARM::D3_D4, ARM::Q2, ARM::D5_D6,
1592 ARM::Q3, ARM::D7_D8, ARM::Q4, ARM::D9_D10, ARM::Q5, ARM::D11_D12,
1593 ARM::Q6, ARM::D13_D14, ARM::Q7, ARM::D15_D16, ARM::Q8, ARM::D17_D18,
1594 ARM::Q9, ARM::D19_D20, ARM::Q10, ARM::D21_D22, ARM::Q11, ARM::D23_D24,
1595 ARM::Q12, ARM::D25_D26, ARM::Q13, ARM::D27_D28, ARM::Q14, ARM::D29_D30,
1596 ARM::Q15
1597};
1598
1599static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
1600 uint64_t Address,
1601 const MCDisassembler *Decoder) {
1602 if (RegNo > 30)
1603 return MCDisassembler::Fail;
1604
1605 unsigned Register = DPairDecoderTable[RegNo];
1606 Inst.addOperand(MCOperand::createReg(Register));
1607 return MCDisassembler::Success;
1608}
1609
1610static const uint16_t DPairSpacedDecoderTable[] = {
1611 ARM::D0_D2, ARM::D1_D3, ARM::D2_D4, ARM::D3_D5,
1612 ARM::D4_D6, ARM::D5_D7, ARM::D6_D8, ARM::D7_D9,
1613 ARM::D8_D10, ARM::D9_D11, ARM::D10_D12, ARM::D11_D13,
1614 ARM::D12_D14, ARM::D13_D15, ARM::D14_D16, ARM::D15_D17,
1615 ARM::D16_D18, ARM::D17_D19, ARM::D18_D20, ARM::D19_D21,
1616 ARM::D20_D22, ARM::D21_D23, ARM::D22_D24, ARM::D23_D25,
1617 ARM::D24_D26, ARM::D25_D27, ARM::D26_D28, ARM::D27_D29,
1618 ARM::D28_D30, ARM::D29_D31
1619};
1620
1621static DecodeStatus
1622DecodeDPairSpacedRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
1623 const MCDisassembler *Decoder) {
1624 if (RegNo > 29)
1625 return MCDisassembler::Fail;
1626
1627 unsigned Register = DPairSpacedDecoderTable[RegNo];
1628 Inst.addOperand(MCOperand::createReg(Register));
1629 return MCDisassembler::Success;
1630}
1631
1632static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
1633 uint64_t Address,
1634 const MCDisassembler *Decoder) {
1635 DecodeStatus S = MCDisassembler::Success;
1636 if (Val == 0xF) return MCDisassembler::Fail;
1637 // AL predicate is not allowed on Thumb1 branches.
1638 if (Inst.getOpcode() == ARM::tBcc && Val == 0xE)
1639 return MCDisassembler::Fail;
1640 const MCInstrInfo *MCII =
1641 static_cast<const ARMDisassembler *>(Decoder)->MCII.get();
1642 if (Val != ARMCC::AL && !MCII->get(Inst.getOpcode()).isPredicable())
1643 Check(S, MCDisassembler::SoftFail);
1644 Inst.addOperand(MCOperand::createImm(Val));
1645 if (Val == ARMCC::AL) {
1646 Inst.addOperand(MCOperand::createReg(0));
1647 } else
1648 Inst.addOperand(MCOperand::createReg(ARM::CPSR));
1649 return S;
1650}
1651
1652static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
1653 uint64_t Address,
1654 const MCDisassembler *Decoder) {
1655 if (Val)
1656 Inst.addOperand(MCOperand::createReg(ARM::CPSR));
1657 else
1658 Inst.addOperand(MCOperand::createReg(0));
1659 return MCDisassembler::Success;
1660}
1661
1662static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Val,
1663 uint64_t Address,
1664 const MCDisassembler *Decoder) {
1665 DecodeStatus S = MCDisassembler::Success;
1666
1667 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1668 unsigned type = fieldFromInstruction(Val, 5, 2);
1669 unsigned imm = fieldFromInstruction(Val, 7, 5);
1670
1671 // Register-immediate
1672 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
1673 return MCDisassembler::Fail;
1674
1675 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1676 switch (type) {
1677 case 0:
1678 Shift = ARM_AM::lsl;
1679 break;
1680 case 1:
1681 Shift = ARM_AM::lsr;
1682 break;
1683 case 2:
1684 Shift = ARM_AM::asr;
1685 break;
1686 case 3:
1687 Shift = ARM_AM::ror;
1688 break;
1689 }
1690
1691 if (Shift == ARM_AM::ror && imm == 0)
1692 Shift = ARM_AM::rrx;
1693
1694 unsigned Op = Shift | (imm << 3);
1695 Inst.addOperand(MCOperand::createImm(Op));
1696
1697 return S;
1698}
1699
1700static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Val,
1701 uint64_t Address,
1702 const MCDisassembler *Decoder) {
1703 DecodeStatus S = MCDisassembler::Success;
1704
1705 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1706 unsigned type = fieldFromInstruction(Val, 5, 2);
1707 unsigned Rs = fieldFromInstruction(Val, 8, 4);
1708
1709 // Register-register
1710 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1711 return MCDisassembler::Fail;
1712 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder)))
1713 return MCDisassembler::Fail;
1714
1715 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1716 switch (type) {
1717 case 0:
1718 Shift = ARM_AM::lsl;
1719 break;
1720 case 1:
1721 Shift = ARM_AM::lsr;
1722 break;
1723 case 2:
1724 Shift = ARM_AM::asr;
1725 break;
1726 case 3:
1727 Shift = ARM_AM::ror;
1728 break;
1729 }
1730
1731 Inst.addOperand(MCOperand::createImm(Shift));
1732
1733 return S;
1734}
1735
1736static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
1737 uint64_t Address,
1738 const MCDisassembler *Decoder) {
1739 DecodeStatus S = MCDisassembler::Success;
1740
1741 bool NeedDisjointWriteback = false;
1742 unsigned WritebackReg = 0;
1743 bool CLRM = false;
1744 switch (Inst.getOpcode()) {
1745 default:
1746 break;
1747 case ARM::LDMIA_UPD:
1748 case ARM::LDMDB_UPD:
1749 case ARM::LDMIB_UPD:
1750 case ARM::LDMDA_UPD:
1751 case ARM::t2LDMIA_UPD:
1752 case ARM::t2LDMDB_UPD:
1753 case ARM::t2STMIA_UPD:
1754 case ARM::t2STMDB_UPD:
1755 NeedDisjointWriteback = true;
1756 WritebackReg = Inst.getOperand(0).getReg();
1757 break;
1758 case ARM::t2CLRM:
1759 CLRM = true;
1760 break;
1761 }
1762
1763 // Empty register lists are not allowed.
1764 if (Val == 0) return MCDisassembler::Fail;
1765 for (unsigned i = 0; i < 16; ++i) {
1766 if (Val & (1 << i)) {
1767 if (CLRM) {
1768 if (!Check(S, DecodeCLRMGPRRegisterClass(Inst, i, Address, Decoder))) {
1769 return MCDisassembler::Fail;
1770 }
1771 } else {
1772 if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder)))
1773 return MCDisassembler::Fail;
1774 // Writeback not allowed if Rn is in the target list.
1775 if (NeedDisjointWriteback && WritebackReg == Inst.end()[-1].getReg())
1776 Check(S, MCDisassembler::SoftFail);
1777 }
1778 }
1779 }
1780
1781 return S;
1782}
1783
1784static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
1785 uint64_t Address,
1786 const MCDisassembler *Decoder) {
1787 DecodeStatus S = MCDisassembler::Success;
1788
1789 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1790 unsigned regs = fieldFromInstruction(Val, 0, 8);
1791
1792 // In case of unpredictable encoding, tweak the operands.
1793 if (regs == 0 || (Vd + regs) > 32) {
1794 regs = Vd + regs > 32 ? 32 - Vd : regs;
1795 regs = std::max( 1u, regs);
1796 S = MCDisassembler::SoftFail;
1797 }
1798
1799 if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder)))
1800 return MCDisassembler::Fail;
1801 for (unsigned i = 0; i < (regs - 1); ++i) {
1802 if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1803 return MCDisassembler::Fail;
1804 }
1805
1806 return S;
1807}
1808
1809static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
1810 uint64_t Address,
1811 const MCDisassembler *Decoder) {
1812 DecodeStatus S = MCDisassembler::Success;
1813
1814 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1815 unsigned regs = fieldFromInstruction(Val, 1, 7);
1816
1817 // In case of unpredictable encoding, tweak the operands.
1818 if (regs == 0 || regs > 16 || (Vd + regs) > 32) {
1819 regs = Vd + regs > 32 ? 32 - Vd : regs;
1820 regs = std::max( 1u, regs);
1821 regs = std::min(16u, regs);
1822 S = MCDisassembler::SoftFail;
1823 }
1824
1825 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
1826 return MCDisassembler::Fail;
1827 for (unsigned i = 0; i < (regs - 1); ++i) {
1828 if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1829 return MCDisassembler::Fail;
1830 }
1831
1832 return S;
1833}
1834
1835static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Val,
1836 uint64_t Address,
1837 const MCDisassembler *Decoder) {
1838 // This operand encodes a mask of contiguous zeros between a specified MSB
1839 // and LSB. To decode it, we create the mask of all bits MSB-and-lower,
1840 // the mask of all bits LSB-and-lower, and then xor them to create
1841 // the mask of that's all ones on [msb, lsb]. Finally we not it to
1842 // create the final mask.
1843 unsigned msb = fieldFromInstruction(Val, 5, 5);
1844 unsigned lsb = fieldFromInstruction(Val, 0, 5);
1845
1846 DecodeStatus S = MCDisassembler::Success;
1847 if (lsb > msb) {
1848 Check(S, MCDisassembler::SoftFail);
1849 // The check above will cause the warning for the "potentially undefined
1850 // instruction encoding" but we can't build a bad MCOperand value here
1851 // with a lsb > msb or else printing the MCInst will cause a crash.
1852 lsb = msb;
1853 }
1854
1855 uint32_t msb_mask = 0xFFFFFFFF;
1856 if (msb != 31) msb_mask = (1U << (msb+1)) - 1;
1857 uint32_t lsb_mask = (1U << lsb) - 1;
1858
1859 Inst.addOperand(MCOperand::createImm(~(msb_mask ^ lsb_mask)));
1860 return S;
1861}
1862
1863static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
1864 uint64_t Address,
1865 const MCDisassembler *Decoder) {
1866 DecodeStatus S = MCDisassembler::Success;
1867
1868 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1869 unsigned CRd = fieldFromInstruction(Insn, 12, 4);
1870 unsigned coproc = fieldFromInstruction(Insn, 8, 4);
1871 unsigned imm = fieldFromInstruction(Insn, 0, 8);
1872 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1873 unsigned U = fieldFromInstruction(Insn, 23, 1);
1874 const FeatureBitset &featureBits =
1875 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
1876
1877 switch (Inst.getOpcode()) {
1878 case ARM::LDC_OFFSET:
1879 case ARM::LDC_PRE:
1880 case ARM::LDC_POST:
1881 case ARM::LDC_OPTION:
1882 case ARM::LDCL_OFFSET:
1883 case ARM::LDCL_PRE:
1884 case ARM::LDCL_POST:
1885 case ARM::LDCL_OPTION:
1886 case ARM::STC_OFFSET:
1887 case ARM::STC_PRE:
1888 case ARM::STC_POST:
1889 case ARM::STC_OPTION:
1890 case ARM::STCL_OFFSET:
1891 case ARM::STCL_PRE:
1892 case ARM::STCL_POST:
1893 case ARM::STCL_OPTION:
1894 case ARM::t2LDC_OFFSET:
1895 case ARM::t2LDC_PRE:
1896 case ARM::t2LDC_POST:
1897 case ARM::t2LDC_OPTION:
1898 case ARM::t2LDCL_OFFSET:
1899 case ARM::t2LDCL_PRE:
1900 case ARM::t2LDCL_POST:
1901 case ARM::t2LDCL_OPTION:
1902 case ARM::t2STC_OFFSET:
1903 case ARM::t2STC_PRE:
1904 case ARM::t2STC_POST:
1905 case ARM::t2STC_OPTION:
1906 case ARM::t2STCL_OFFSET:
1907 case ARM::t2STCL_PRE:
1908 case ARM::t2STCL_POST:
1909 case ARM::t2STCL_OPTION:
1910 case ARM::t2LDC2_OFFSET:
1911 case ARM::t2LDC2L_OFFSET:
1912 case ARM::t2LDC2_PRE:
1913 case ARM::t2LDC2L_PRE:
1914 case ARM::t2STC2_OFFSET:
1915 case ARM::t2STC2L_OFFSET:
1916 case ARM::t2STC2_PRE:
1917 case ARM::t2STC2L_PRE:
1918 case ARM::LDC2_OFFSET:
1919 case ARM::LDC2L_OFFSET:
1920 case ARM::LDC2_PRE:
1921 case ARM::LDC2L_PRE:
1922 case ARM::STC2_OFFSET:
1923 case ARM::STC2L_OFFSET:
1924 case ARM::STC2_PRE:
1925 case ARM::STC2L_PRE:
1926 case ARM::t2LDC2_OPTION:
1927 case ARM::t2STC2_OPTION:
1928 case ARM::t2LDC2_POST:
1929 case ARM::t2LDC2L_POST:
1930 case ARM::t2STC2_POST:
1931 case ARM::t2STC2L_POST:
1932 case ARM::LDC2_POST:
1933 case ARM::LDC2L_POST:
1934 case ARM::STC2_POST:
1935 case ARM::STC2L_POST:
1936 if (coproc == 0xA || coproc == 0xB ||
1937 (featureBits[ARM::HasV8_1MMainlineOps] &&
1938 (coproc == 0x8 || coproc == 0x9 || coproc == 0xA || coproc == 0xB ||
1939 coproc == 0xE || coproc == 0xF)))
1940 return MCDisassembler::Fail;
1941 break;
1942 default:
1943 break;
1944 }
1945
1946 if (featureBits[ARM::HasV8Ops] && (coproc != 14))
1947 return MCDisassembler::Fail;
1948
1949 Inst.addOperand(MCOperand::createImm(coproc));
1950 Inst.addOperand(MCOperand::createImm(CRd));
1951 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1952 return MCDisassembler::Fail;
1953
1954 switch (Inst.getOpcode()) {
1955 case ARM::t2LDC2_OFFSET:
1956 case ARM::t2LDC2L_OFFSET:
1957 case ARM::t2LDC2_PRE:
1958 case ARM::t2LDC2L_PRE:
1959 case ARM::t2STC2_OFFSET:
1960 case ARM::t2STC2L_OFFSET:
1961 case ARM::t2STC2_PRE:
1962 case ARM::t2STC2L_PRE:
1963 case ARM::LDC2_OFFSET:
1964 case ARM::LDC2L_OFFSET:
1965 case ARM::LDC2_PRE:
1966 case ARM::LDC2L_PRE:
1967 case ARM::STC2_OFFSET:
1968 case ARM::STC2L_OFFSET:
1969 case ARM::STC2_PRE:
1970 case ARM::STC2L_PRE:
1971 case ARM::t2LDC_OFFSET:
1972 case ARM::t2LDCL_OFFSET:
1973 case ARM::t2LDC_PRE:
1974 case ARM::t2LDCL_PRE:
1975 case ARM::t2STC_OFFSET:
1976 case ARM::t2STCL_OFFSET:
1977 case ARM::t2STC_PRE:
1978 case ARM::t2STCL_PRE:
1979 case ARM::LDC_OFFSET:
1980 case ARM::LDCL_OFFSET:
1981 case ARM::LDC_PRE:
1982 case ARM::LDCL_PRE:
1983 case ARM::STC_OFFSET:
1984 case ARM::STCL_OFFSET:
1985 case ARM::STC_PRE:
1986 case ARM::STCL_PRE:
1987 imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm);
1988 Inst.addOperand(MCOperand::createImm(imm));
1989 break;
1990 case ARM::t2LDC2_POST:
1991 case ARM::t2LDC2L_POST:
1992 case ARM::t2STC2_POST:
1993 case ARM::t2STC2L_POST:
1994 case ARM::LDC2_POST:
1995 case ARM::LDC2L_POST:
1996 case ARM::STC2_POST:
1997 case ARM::STC2L_POST:
1998 case ARM::t2LDC_POST:
1999 case ARM::t2LDCL_POST:
2000 case ARM::t2STC_POST:
2001 case ARM::t2STCL_POST:
2002 case ARM::LDC_POST:
2003 case ARM::LDCL_POST:
2004 case ARM::STC_POST:
2005 case ARM::STCL_POST:
2006 imm |= U << 8;
2007 [[fallthrough]];
2008 default:
2009 // The 'option' variant doesn't encode 'U' in the immediate since
2010 // the immediate is unsigned [0,255].
2011 Inst.addOperand(MCOperand::createImm(imm));
2012 break;
2013 }
2014
2015 switch (Inst.getOpcode()) {
2016 case ARM::LDC_OFFSET:
2017 case ARM::LDC_PRE:
2018 case ARM::LDC_POST:
2019 case ARM::LDC_OPTION:
2020 case ARM::LDCL_OFFSET:
2021 case ARM::LDCL_PRE:
2022 case ARM::LDCL_POST:
2023 case ARM::LDCL_OPTION:
2024 case ARM::STC_OFFSET:
2025 case ARM::STC_PRE:
2026 case ARM::STC_POST:
2027 case ARM::STC_OPTION:
2028 case ARM::STCL_OFFSET:
2029 case ARM::STCL_PRE:
2030 case ARM::STCL_POST:
2031 case ARM::STCL_OPTION:
2032 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2033 return MCDisassembler::Fail;
2034 break;
2035 default:
2036 break;
2037 }
2038
2039 return S;
2040}
2041
2042static DecodeStatus
2043DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
2044 const MCDisassembler *Decoder) {
2045 DecodeStatus S = MCDisassembler::Success;
2046
2047 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2048 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
2049 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2050 unsigned imm = fieldFromInstruction(Insn, 0, 12);
2051 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2052 unsigned reg = fieldFromInstruction(Insn, 25, 1);
2053 unsigned P = fieldFromInstruction(Insn, 24, 1);
2054 unsigned W = fieldFromInstruction(Insn, 21, 1);
2055
2056 // On stores, the writeback operand precedes Rt.
2057 switch (Inst.getOpcode()) {
2058 case ARM::STR_POST_IMM:
2059 case ARM::STR_POST_REG:
2060 case ARM::STRB_POST_IMM:
2061 case ARM::STRB_POST_REG:
2062 case ARM::STRT_POST_REG:
2063 case ARM::STRT_POST_IMM:
2064 case ARM::STRBT_POST_REG:
2065 case ARM::STRBT_POST_IMM:
2066 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2067 return MCDisassembler::Fail;
2068 break;
2069 default:
2070 break;
2071 }
2072
2073 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
2074 return MCDisassembler::Fail;
2075
2076 // On loads, the writeback operand comes after Rt.
2077 switch (Inst.getOpcode()) {
2078 case ARM::LDR_POST_IMM:
2079 case ARM::LDR_POST_REG:
2080 case ARM::LDRB_POST_IMM:
2081 case ARM::LDRB_POST_REG:
2082 case ARM::LDRBT_POST_REG:
2083 case ARM::LDRBT_POST_IMM:
2084 case ARM::LDRT_POST_REG:
2085 case ARM::LDRT_POST_IMM:
2086 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2087 return MCDisassembler::Fail;
2088 break;
2089 default:
2090 break;
2091 }
2092
2093 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2094 return MCDisassembler::Fail;
2095
2096 ARM_AM::AddrOpc Op = ARM_AM::add;
2097 if (!fieldFromInstruction(Insn, 23, 1))
2098 Op = ARM_AM::sub;
2099
2100 bool writeback = (P == 0) || (W == 1);
2101 unsigned idx_mode = 0;
2102 if (P && writeback)
2103 idx_mode = ARMII::IndexModePre;
2104 else if (!P && writeback)
2105 idx_mode = ARMII::IndexModePost;
2106
2107 if (writeback && (Rn == 15 || Rn == Rt))
2108 S = MCDisassembler::SoftFail; // UNPREDICTABLE
2109
2110 if (reg) {
2111 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2112 return MCDisassembler::Fail;
2113 ARM_AM::ShiftOpc Opc = ARM_AM::lsl;
2114 switch( fieldFromInstruction(Insn, 5, 2)) {
2115 case 0:
2116 Opc = ARM_AM::lsl;
2117 break;
2118 case 1:
2119 Opc = ARM_AM::lsr;
2120 break;
2121 case 2:
2122 Opc = ARM_AM::asr;
2123 break;
2124 case 3:
2125 Opc = ARM_AM::ror;
2126 break;
2127 default:
2128 return MCDisassembler::Fail;
2129 }
2130 unsigned amt = fieldFromInstruction(Insn, 7, 5);
2131 if (Opc == ARM_AM::ror && amt == 0)
2132 Opc = ARM_AM::rrx;
2133 unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode);
2134
2135 Inst.addOperand(MCOperand::createImm(imm));
2136 } else {
2137 Inst.addOperand(MCOperand::createReg(0));
2138 unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode);
2139 Inst.addOperand(MCOperand::createImm(tmp));
2140 }
2141
2142 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2143 return MCDisassembler::Fail;
2144
2145 return S;
2146}
2147
2148static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Val,
2149 uint64_t Address,
2150 const MCDisassembler *Decoder) {
2151 DecodeStatus S = MCDisassembler::Success;
2152
2153 unsigned Rn = fieldFromInstruction(Val, 13, 4);
2154 unsigned Rm = fieldFromInstruction(Val, 0, 4);
2155 unsigned type = fieldFromInstruction(Val, 5, 2);
2156 unsigned imm = fieldFromInstruction(Val, 7, 5);
2157 unsigned U = fieldFromInstruction(Val, 12, 1);
2158
2159 ARM_AM::ShiftOpc ShOp = ARM_AM::lsl;
2160 switch (type) {
2161 case 0:
2162 ShOp = ARM_AM::lsl;
2163 break;
2164 case 1:
2165 ShOp = ARM_AM::lsr;
2166 break;
2167 case 2:
2168 ShOp = ARM_AM::asr;
2169 break;
2170 case 3:
2171 ShOp = ARM_AM::ror;
2172 break;
2173 }
2174
2175 if (ShOp == ARM_AM::ror && imm == 0)
2176 ShOp = ARM_AM::rrx;
2177
2178 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2179 return MCDisassembler::Fail;
2180 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2181 return MCDisassembler::Fail;
2182 unsigned shift;
2183 if (U)
2184 shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp);
2185 else
2186 shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp);
2187 Inst.addOperand(MCOperand::createImm(shift));
2188
2189 return S;
2190}
2191
2192static DecodeStatus DecodeTSBInstruction(MCInst &Inst, unsigned Insn,
2193 uint64_t Address,
2194 const MCDisassembler *Decoder) {
2195 if (Inst.getOpcode() != ARM::TSB && Inst.getOpcode() != ARM::t2TSB)
2196 return MCDisassembler::Fail;
2197
2198 // The "csync" operand is not encoded into the "tsb" instruction (as this is
2199 // the only available operand), but LLVM expects the instruction to have one
2200 // operand, so we need to add the csync when decoding.
2201 Inst.addOperand(MCOperand::createImm(ARM_TSB::CSYNC));
2202 return MCDisassembler::Success;
2203}
2204
2205static DecodeStatus DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn,
2206 uint64_t Address,
2207 const MCDisassembler *Decoder) {
2208 DecodeStatus S = MCDisassembler::Success;
2209
2210 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
2211 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2212 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2213 unsigned type = fieldFromInstruction(Insn, 22, 1);
2214 unsigned imm = fieldFromInstruction(Insn, 8, 4);
2215 unsigned U = ((~fieldFromInstruction(Insn, 23, 1)) & 1) << 8;
2216 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2217 unsigned W = fieldFromInstruction(Insn, 21, 1);
2218 unsigned P = fieldFromInstruction(Insn, 24, 1);
2219 unsigned Rt2 = Rt + 1;
2220
2221 bool writeback = (W == 1) | (P == 0);
2222
2223 // For {LD,ST}RD, Rt must be even, else undefined.
2224 switch (Inst.getOpcode()) {
2225 case ARM::STRD:
2226 case ARM::STRD_PRE:
2227 case ARM::STRD_POST:
2228 case ARM::LDRD:
2229 case ARM::LDRD_PRE:
2230 case ARM::LDRD_POST:
2231 if (Rt & 0x1) S = MCDisassembler::SoftFail;
2232 break;
2233 default:
2234 break;
2235 }
2236 switch (Inst.getOpcode()) {
2237 case ARM::STRD:
2238 case ARM::STRD_PRE:
2239 case ARM::STRD_POST:
2240 if (P == 0 && W == 1)
2241 S = MCDisassembler::SoftFail;
2242
2243 if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2))
2244 S = MCDisassembler::SoftFail;
2245 if (type && Rm == 15)
2246 S = MCDisassembler::SoftFail;
2247 if (Rt2 == 15)
2248 S = MCDisassembler::SoftFail;
2249 if (!type && fieldFromInstruction(Insn, 8, 4))
2250 S = MCDisassembler::SoftFail;
2251 break;
2252 case ARM::STRH:
2253 case ARM::STRH_PRE:
2254 case ARM::STRH_POST:
2255 if (Rt == 15)
2256 S = MCDisassembler::SoftFail;
2257 if (writeback && (Rn == 15 || Rn == Rt))
2258 S = MCDisassembler::SoftFail;
2259 if (!type && Rm == 15)
2260 S = MCDisassembler::SoftFail;
2261 break;
2262 case ARM::LDRD:
2263 case ARM::LDRD_PRE:
2264 case ARM::LDRD_POST:
2265 if (type && Rn == 15) {
2266 if (Rt2 == 15)
2267 S = MCDisassembler::SoftFail;
2268 break;
2269 }
2270 if (P == 0 && W == 1)
2271 S = MCDisassembler::SoftFail;
2272 if (!type && (Rt2 == 15 || Rm == 15 || Rm == Rt || Rm == Rt2))
2273 S = MCDisassembler::SoftFail;
2274 if (!type && writeback && Rn == 15)
2275 S = MCDisassembler::SoftFail;
2276 if (writeback && (Rn == Rt || Rn == Rt2))
2277 S = MCDisassembler::SoftFail;
2278 break;
2279 case ARM::LDRH:
2280 case ARM::LDRH_PRE:
2281 case ARM::LDRH_POST:
2282 if (type && Rn == 15) {
2283 if (Rt == 15)
2284 S = MCDisassembler::SoftFail;
2285 break;
2286 }
2287 if (Rt == 15)
2288 S = MCDisassembler::SoftFail;
2289 if (!type && Rm == 15)
2290 S = MCDisassembler::SoftFail;
2291 if (!type && writeback && (Rn == 15 || Rn == Rt))
2292 S = MCDisassembler::SoftFail;
2293 break;
2294 case ARM::LDRSH:
2295 case ARM::LDRSH_PRE:
2296 case ARM::LDRSH_POST:
2297 case ARM::LDRSB:
2298 case ARM::LDRSB_PRE:
2299 case ARM::LDRSB_POST:
2300 if (type && Rn == 15) {
2301 if (Rt == 15)
2302 S = MCDisassembler::SoftFail;
2303 break;
2304 }
2305 if (type && (Rt == 15 || (writeback && Rn == Rt)))
2306 S = MCDisassembler::SoftFail;
2307 if (!type && (Rt == 15 || Rm == 15))
2308 S = MCDisassembler::SoftFail;
2309 if (!type && writeback && (Rn == 15 || Rn == Rt))
2310 S = MCDisassembler::SoftFail;
2311 break;
2312 default:
2313 break;
2314 }
2315
2316 if (writeback) { // Writeback
2317 if (P)
2318 U |= ARMII::IndexModePre << 9;
2319 else
2320 U |= ARMII::IndexModePost << 9;
2321
2322 // On stores, the writeback operand precedes Rt.
2323 switch (Inst.getOpcode()) {
2324 case ARM::STRD:
2325 case ARM::STRD_PRE:
2326 case ARM::STRD_POST:
2327 case ARM::STRH:
2328 case ARM::STRH_PRE:
2329 case ARM::STRH_POST:
2330 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2331 return MCDisassembler::Fail;
2332 break;
2333 default:
2334 break;
2335 }
2336 }
2337
2338 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
2339 return MCDisassembler::Fail;
2340 switch (Inst.getOpcode()) {
2341 case ARM::STRD:
2342 case ARM::STRD_PRE:
2343 case ARM::STRD_POST:
2344 case ARM::LDRD:
2345 case ARM::LDRD_PRE:
2346 case ARM::LDRD_POST:
2347 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder)))
2348 return MCDisassembler::Fail;
2349 break;
2350 default:
2351 break;
2352 }
2353
2354 if (writeback) {
2355 // On loads, the writeback operand comes after Rt.
2356 switch (Inst.getOpcode()) {
2357 case ARM::LDRD:
2358 case ARM::LDRD_PRE:
2359 case ARM::LDRD_POST:
2360 case ARM::LDRH:
2361 case ARM::LDRH_PRE:
2362 case ARM::LDRH_POST:
2363 case ARM::LDRSH:
2364 case ARM::LDRSH_PRE:
2365 case ARM::LDRSH_POST:
2366 case ARM::LDRSB:
2367 case ARM::LDRSB_PRE:
2368 case ARM::LDRSB_POST:
2369 case ARM::LDRHTr:
2370 case ARM::LDRSBTr:
2371 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2372 return MCDisassembler::Fail;
2373 break;
2374 default:
2375 break;
2376 }
2377 }
2378
2379 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2380 return MCDisassembler::Fail;
2381
2382 if (type) {
2383 Inst.addOperand(MCOperand::createReg(0));
2384 Inst.addOperand(MCOperand::createImm(U | (imm << 4) | Rm));
2385 } else {
2386 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2387 return MCDisassembler::Fail;
2388 Inst.addOperand(MCOperand::createImm(U));
2389 }
2390
2391 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2392 return MCDisassembler::Fail;
2393
2394 return S;
2395}
2396
2397static DecodeStatus DecodeRFEInstruction(MCInst &Inst, unsigned Insn,
2398 uint64_t Address,
2399 const MCDisassembler *Decoder) {
2400 DecodeStatus S = MCDisassembler::Success;
2401
2402 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2403 unsigned mode = fieldFromInstruction(Insn, 23, 2);
2404
2405 switch (mode) {
2406 case 0:
2407 mode = ARM_AM::da;
2408 break;
2409 case 1:
2410 mode = ARM_AM::ia;
2411 break;
2412 case 2:
2413 mode = ARM_AM::db;
2414 break;
2415 case 3:
2416 mode = ARM_AM::ib;
2417 break;
2418 }
2419
2420 Inst.addOperand(MCOperand::createImm(mode));
2421 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2422 return MCDisassembler::Fail;
2423
2424 return S;
2425}
2426
2427static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
2428 uint64_t Address,
2429 const MCDisassembler *Decoder) {
2430 DecodeStatus S = MCDisassembler::Success;
2431
2432 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2433 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2434 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2435 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2436
2437 if (pred == 0xF)
2438 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2439
2440 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2441 return MCDisassembler::Fail;
2442 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2443 return MCDisassembler::Fail;
2444 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2445 return MCDisassembler::Fail;
2446 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2447 return MCDisassembler::Fail;
2448 return S;
2449}
2450
2451static DecodeStatus
2452DecodeMemMultipleWritebackInstruction(MCInst &Inst, unsigned Insn,
2453 uint64_t Address,
2454 const MCDisassembler *Decoder) {
2455 DecodeStatus S = MCDisassembler::Success;
2456
2457 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2458 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2459 unsigned reglist = fieldFromInstruction(Insn, 0, 16);
2460
2461 if (pred == 0xF) {
2462 // Ambiguous with RFE and SRS
2463 switch (Inst.getOpcode()) {
2464 case ARM::LDMDA:
2465 Inst.setOpcode(ARM::RFEDA);
2466 break;
2467 case ARM::LDMDA_UPD:
2468 Inst.setOpcode(ARM::RFEDA_UPD);
2469 break;
2470 case ARM::LDMDB:
2471 Inst.setOpcode(ARM::RFEDB);
2472 break;
2473 case ARM::LDMDB_UPD:
2474 Inst.setOpcode(ARM::RFEDB_UPD);
2475 break;
2476 case ARM::LDMIA:
2477 Inst.setOpcode(ARM::RFEIA);
2478 break;
2479 case ARM::LDMIA_UPD:
2480 Inst.setOpcode(ARM::RFEIA_UPD);
2481 break;
2482 case ARM::LDMIB:
2483 Inst.setOpcode(ARM::RFEIB);
2484 break;
2485 case ARM::LDMIB_UPD:
2486 Inst.setOpcode(ARM::RFEIB_UPD);
2487 break;
2488 case ARM::STMDA:
2489 Inst.setOpcode(ARM::SRSDA);
2490 break;
2491 case ARM::STMDA_UPD:
2492 Inst.setOpcode(ARM::SRSDA_UPD);
2493 break;
2494 case ARM::STMDB:
2495 Inst.setOpcode(ARM::SRSDB);
2496 break;
2497 case ARM::STMDB_UPD:
2498 Inst.setOpcode(ARM::SRSDB_UPD);
2499 break;
2500 case ARM::STMIA:
2501 Inst.setOpcode(ARM::SRSIA);
2502 break;
2503 case ARM::STMIA_UPD:
2504 Inst.setOpcode(ARM::SRSIA_UPD);
2505 break;
2506 case ARM::STMIB:
2507 Inst.setOpcode(ARM::SRSIB);
2508 break;
2509 case ARM::STMIB_UPD:
2510 Inst.setOpcode(ARM::SRSIB_UPD);
2511 break;
2512 default:
2513 return MCDisassembler::Fail;
2514 }
2515
2516 // For stores (which become SRS's, the only operand is the mode.
2517 if (fieldFromInstruction(Insn, 20, 1) == 0) {
2518 // Check SRS encoding constraints
2519 if (!(fieldFromInstruction(Insn, 22, 1) == 1 &&
2520 fieldFromInstruction(Insn, 20, 1) == 0))
2521 return MCDisassembler::Fail;
2522
2523 Inst.addOperand(
2524 MCOperand::createImm(fieldFromInstruction(Insn, 0, 4)));
2525 return S;
2526 }
2527
2528 return DecodeRFEInstruction(Inst, Insn, Address, Decoder);
2529 }
2530
2531 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2532 return MCDisassembler::Fail;
2533 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2534 return MCDisassembler::Fail; // Tied
2535 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2536 return MCDisassembler::Fail;
2537 if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder)))
2538 return MCDisassembler::Fail;
2539
2540 return S;
2541}
2542
2543// Check for UNPREDICTABLE predicated ESB instruction
2544static DecodeStatus DecodeHINTInstruction(MCInst &Inst, unsigned Insn,
2545 uint64_t Address,
2546 const MCDisassembler *Decoder) {
2547 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2548 unsigned imm8 = fieldFromInstruction(Insn, 0, 8);
2549 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
2550 const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits();
2551
2552 DecodeStatus S = MCDisassembler::Success;
2553
2554 Inst.addOperand(MCOperand::createImm(imm8));
2555
2556 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2557 return MCDisassembler::Fail;
2558
2559 // ESB is unpredictable if pred != AL. Without the RAS extension, it is a NOP,
2560 // so all predicates should be allowed.
2561 if (imm8 == 0x10 && pred != 0xe && ((FeatureBits[ARM::FeatureRAS]) != 0))
2562 S = MCDisassembler::SoftFail;
2563
2564 return S;
2565}
2566
2567static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
2568 uint64_t Address,
2569 const MCDisassembler *Decoder) {
2570 unsigned imod = fieldFromInstruction(Insn, 18, 2);
2571 unsigned M = fieldFromInstruction(Insn, 17, 1);
2572 unsigned iflags = fieldFromInstruction(Insn, 6, 3);
2573 unsigned mode = fieldFromInstruction(Insn, 0, 5);
2574
2575 DecodeStatus S = MCDisassembler::Success;
2576
2577 // This decoder is called from multiple location that do not check
2578 // the full encoding is valid before they do.
2579 if (fieldFromInstruction(Insn, 5, 1) != 0 ||
2580 fieldFromInstruction(Insn, 16, 1) != 0 ||
2581 fieldFromInstruction(Insn, 20, 8) != 0x10)
2582 return MCDisassembler::Fail;
2583
2584 // imod == '01' --> UNPREDICTABLE
2585 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
2586 // return failure here. The '01' imod value is unprintable, so there's
2587 // nothing useful we could do even if we returned UNPREDICTABLE.
2588
2589 if (imod == 1) return MCDisassembler::Fail;
2590
2591 if (imod && M) {
2592 Inst.setOpcode(ARM::CPS3p);
2593 Inst.addOperand(MCOperand::createImm(imod));
2594 Inst.addOperand(MCOperand::createImm(iflags));
2595 Inst.addOperand(MCOperand::createImm(mode));
2596 } else if (imod && !M) {
2597 Inst.setOpcode(ARM::CPS2p);
2598 Inst.addOperand(MCOperand::createImm(imod));
2599 Inst.addOperand(MCOperand::createImm(iflags));
2600 if (mode) S = MCDisassembler::SoftFail;
2601 } else if (!imod && M) {
2602 Inst.setOpcode(ARM::CPS1p);
2603 Inst.addOperand(MCOperand::createImm(mode));
2604 if (iflags) S = MCDisassembler::SoftFail;
2605 } else {
2606 // imod == '00' && M == '0' --> UNPREDICTABLE
2607 Inst.setOpcode(ARM::CPS1p);
2608 Inst.addOperand(MCOperand::createImm(mode));
2609 S = MCDisassembler::SoftFail;
2610 }
2611
2612 return S;
2613}
2614
2615static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
2616 uint64_t Address,
2617 const MCDisassembler *Decoder) {
2618 unsigned imod = fieldFromInstruction(Insn, 9, 2);
2619 unsigned M = fieldFromInstruction(Insn, 8, 1);
2620 unsigned iflags = fieldFromInstruction(Insn, 5, 3);
2621 unsigned mode = fieldFromInstruction(Insn, 0, 5);
2622
2623 DecodeStatus S = MCDisassembler::Success;
2624
2625 // imod == '01' --> UNPREDICTABLE
2626 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
2627 // return failure here. The '01' imod value is unprintable, so there's
2628 // nothing useful we could do even if we returned UNPREDICTABLE.
2629
2630 if (imod == 1) return MCDisassembler::Fail;
2631
2632 if (imod && M) {
2633 Inst.setOpcode(ARM::t2CPS3p);
2634 Inst.addOperand(MCOperand::createImm(imod));
2635 Inst.addOperand(MCOperand::createImm(iflags));
2636 Inst.addOperand(MCOperand::createImm(mode));
2637 } else if (imod && !M) {
2638 Inst.setOpcode(ARM::t2CPS2p);
2639 Inst.addOperand(MCOperand::createImm(imod));
2640 Inst.addOperand(MCOperand::createImm(iflags));
2641 if (mode) S = MCDisassembler::SoftFail;
2642 } else if (!imod && M) {
2643 Inst.setOpcode(ARM::t2CPS1p);
2644 Inst.addOperand(MCOperand::createImm(mode));
2645 if (iflags) S = MCDisassembler::SoftFail;
2646 } else {
2647 // imod == '00' && M == '0' --> this is a HINT instruction
2648 int imm = fieldFromInstruction(Insn, 0, 8);
2649 // HINT are defined only for immediate in [0..4]
2650 if(imm > 4) return MCDisassembler::Fail;
2651 Inst.setOpcode(ARM::t2HINT);
2652 Inst.addOperand(MCOperand::createImm(imm));
2653 }
2654
2655 return S;
2656}
2657
2658static DecodeStatus
2659DecodeT2HintSpaceInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
2660 const MCDisassembler *Decoder) {
2661 unsigned imm = fieldFromInstruction(Insn, 0, 8);
2662
2663 unsigned Opcode = ARM::t2HINT;
2664
2665 if (imm == 0x0D) {
2666 Opcode = ARM::t2PACBTI;
2667 } else if (imm == 0x1D) {
2668 Opcode = ARM::t2PAC;
2669 } else if (imm == 0x2D) {
2670 Opcode = ARM::t2AUT;
2671 } else if (imm == 0x0F) {
2672 Opcode = ARM::t2BTI;
2673 }
2674
2675 Inst.setOpcode(Opcode);
2676 if (Opcode == ARM::t2HINT) {
2677 Inst.addOperand(MCOperand::createImm(imm));
2678 }
2679
2680 return MCDisassembler::Success;
2681}
2682
2683static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
2684 uint64_t Address,
2685 const MCDisassembler *Decoder) {
2686 DecodeStatus S = MCDisassembler::Success;
2687
2688 unsigned Rd = fieldFromInstruction(Insn, 8, 4);
2689 unsigned imm = 0;
2690
2691 imm |= (fieldFromInstruction(Insn, 0, 8) << 0);
2692 imm |= (fieldFromInstruction(Insn, 12, 3) << 8);
2693 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2694 imm |= (fieldFromInstruction(Insn, 26, 1) << 11);
2695
2696 if (Inst.getOpcode() == ARM::t2MOVTi16)
2697 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2698 return MCDisassembler::Fail;
2699 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2700 return MCDisassembler::Fail;
2701
2702 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2703 Inst.addOperand(MCOperand::createImm(imm));
2704
2705 return S;
2706}
2707
2708static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
2709 uint64_t Address,
2710 const MCDisassembler *Decoder) {
2711 DecodeStatus S = MCDisassembler::Success;
2712
2713 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2714 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2715 unsigned imm = 0;
2716
2717 imm |= (fieldFromInstruction(Insn, 0, 12) << 0);
2718 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2719
2720 if (Inst.getOpcode() == ARM::MOVTi16)
2721 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2722 return MCDisassembler::Fail;
2723
2724 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2725 return MCDisassembler::Fail;
2726
2727 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2728 Inst.addOperand(MCOperand::createImm(imm));
2729
2730 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2731 return MCDisassembler::Fail;
2732
2733 return S;
2734}
2735
2736static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
2737 uint64_t Address,
2738 const MCDisassembler *Decoder) {
2739 DecodeStatus S = MCDisassembler::Success;
2740
2741 unsigned Rd = fieldFromInstruction(Insn, 16, 4);
2742 unsigned Rn = fieldFromInstruction(Insn, 0, 4);
2743 unsigned Rm = fieldFromInstruction(Insn, 8, 4);
2744 unsigned Ra = fieldFromInstruction(Insn, 12, 4);
2745 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2746
2747 if (pred == 0xF)
2748 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2749
2750 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2751 return MCDisassembler::Fail;
2752 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2753 return MCDisassembler::Fail;
2754 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2755 return MCDisassembler::Fail;
2756 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder)))
2757 return MCDisassembler::Fail;
2758
2759 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2760 return MCDisassembler::Fail;
2761
2762 return S;
2763}
2764
2765static DecodeStatus DecodeTSTInstruction(MCInst &Inst, unsigned Insn,
2766 uint64_t Address,
2767 const MCDisassembler *Decoder) {
2768 DecodeStatus S = MCDisassembler::Success;
2769
2770 unsigned Pred = fieldFromInstruction(Insn, 28, 4);
2771 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2772 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2773
2774 if (Pred == 0xF)
2775 return DecodeSETPANInstruction(Inst, Insn, Address, Decoder);
2776
2777 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2778 return MCDisassembler::Fail;
2779 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2780 return MCDisassembler::Fail;
2781 if (!Check(S, DecodePredicateOperand(Inst, Pred, Address, Decoder)))
2782 return MCDisassembler::Fail;
2783
2784 return S;
2785}
2786
2787static DecodeStatus DecodeSETPANInstruction(MCInst &Inst, unsigned Insn,
2788 uint64_t Address,
2789 const MCDisassembler *Decoder) {
2790 DecodeStatus S = MCDisassembler::Success;
2791
2792 unsigned Imm = fieldFromInstruction(Insn, 9, 1);
2793
2794 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
2795 const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits();
2796
2797 if (!FeatureBits[ARM::HasV8_1aOps] ||
2798 !FeatureBits[ARM::HasV8Ops])
2799 return MCDisassembler::Fail;
2800
2801 // Decoder can be called from DecodeTST, which does not check the full
2802 // encoding is valid.
2803 if (fieldFromInstruction(Insn, 20,12) != 0xf11 ||
2804 fieldFromInstruction(Insn, 4,4) != 0)
2805 return MCDisassembler::Fail;
2806 if (fieldFromInstruction(Insn, 10,10) != 0 ||
2807 fieldFromInstruction(Insn, 0,4) != 0)
2808 S = MCDisassembler::SoftFail;
2809
2810 Inst.setOpcode(ARM::SETPAN);
2811 Inst.addOperand(MCOperand::createImm(Imm));
2812
2813 return S;
2814}
2815
2816static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
2817 uint64_t Address,
2818 const MCDisassembler *Decoder) {
2819 DecodeStatus S = MCDisassembler::Success;
2820
2821 unsigned add = fieldFromInstruction(Val, 12, 1);
2822 unsigned imm = fieldFromInstruction(Val, 0, 12);
2823 unsigned Rn = fieldFromInstruction(Val, 13, 4);
2824
2825 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2826 return MCDisassembler::Fail;
2827
2828 if (!add) imm *= -1;
2829 if (imm == 0 && !add) imm = INT32_MIN;
2830 Inst.addOperand(MCOperand::createImm(imm));
2831 if (Rn == 15)
2832 tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder);
2833
2834 return S;
2835}
2836
2837static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
2838 uint64_t Address,
2839 const MCDisassembler *Decoder) {
2840 DecodeStatus S = MCDisassembler::Success;
2841
2842 unsigned Rn = fieldFromInstruction(Val, 9, 4);
2843 // U == 1 to add imm, 0 to subtract it.
2844 unsigned U = fieldFromInstruction(Val, 8, 1);
2845 unsigned imm = fieldFromInstruction(Val, 0, 8);
2846
2847 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2848 return MCDisassembler::Fail;
2849
2850 if (U)
2851 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::add, imm)));
2852 else
2853 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm)));
2854
2855 return S;
2856}
2857
2858static DecodeStatus DecodeAddrMode5FP16Operand(MCInst &Inst, unsigned Val,
2859 uint64_t Address,
2860 const MCDisassembler *Decoder) {
2861 DecodeStatus S = MCDisassembler::Success;
2862
2863 unsigned Rn = fieldFromInstruction(Val, 9, 4);
2864 // U == 1 to add imm, 0 to subtract it.
2865 unsigned U = fieldFromInstruction(Val, 8, 1);
2866 unsigned imm = fieldFromInstruction(Val, 0, 8);
2867
2868 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2869 return MCDisassembler::Fail;
2870
2871 if (U)
2872 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::add, imm)));
2873 else
2874 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::sub, imm)));
2875
2876 return S;
2877}
2878
2879static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
2880 uint64_t Address,
2881 const MCDisassembler *Decoder) {
2882 return DecodeGPRRegisterClass(Inst, Val, Address, Decoder);
2883}
2884
2885static DecodeStatus DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
2886 uint64_t Address,
2887 const MCDisassembler *Decoder) {
2888 DecodeStatus Status = MCDisassembler::Success;
2889
2890 // Note the J1 and J2 values are from the encoded instruction. So here
2891 // change them to I1 and I2 values via as documented:
2892 // I1 = NOT(J1 EOR S);
2893 // I2 = NOT(J2 EOR S);
2894 // and build the imm32 with one trailing zero as documented:
2895 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
2896 unsigned S = fieldFromInstruction(Insn, 26, 1);
2897 unsigned J1 = fieldFromInstruction(Insn, 13, 1);
2898 unsigned J2 = fieldFromInstruction(Insn, 11, 1);
2899 unsigned I1 = !(J1 ^ S);
2900 unsigned I2 = !(J2 ^ S);
2901 unsigned imm10 = fieldFromInstruction(Insn, 16, 10);
2902 unsigned imm11 = fieldFromInstruction(Insn, 0, 11);
2903 unsigned tmp = (S << 23) | (I1 << 22) | (I2 << 21) | (imm10 << 11) | imm11;
2904 int imm32 = SignExtend32<25>(tmp << 1);
2905 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
2906 true, 4, Inst, Decoder))
2907 Inst.addOperand(MCOperand::createImm(imm32));
2908
2909 return Status;
2910}
2911
2912static DecodeStatus DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn,
2913 uint64_t Address,
2914 const MCDisassembler *Decoder) {
2915 DecodeStatus S = MCDisassembler::Success;
2916
2917 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2918 unsigned imm = fieldFromInstruction(Insn, 0, 24) << 2;
2919
2920 if (pred == 0xF) {
2921 Inst.setOpcode(ARM::BLXi);
2922 imm |= fieldFromInstruction(Insn, 24, 1) << 1;
2923 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2924 true, 4, Inst, Decoder))
2925 Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm)));
2926 return S;
2927 }
2928
2929 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2930 true, 4, Inst, Decoder))
2931 Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm)));
2932
2933 // We already have BL_pred for BL w/ predicate, no need to add addition
2934 // predicate opreands for BL
2935 if (Inst.getOpcode() != ARM::BL)
2936 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2937 return MCDisassembler::Fail;
2938
2939 return S;
2940}
2941
2942static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
2943 uint64_t Address,
2944 const MCDisassembler *Decoder) {
2945 DecodeStatus S = MCDisassembler::Success;
2946
2947 unsigned Rm = fieldFromInstruction(Val, 0, 4);
2948 unsigned align = fieldFromInstruction(Val, 4, 2);
2949
2950 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2951 return MCDisassembler::Fail;
2952 if (!align)
2953 Inst.addOperand(MCOperand::createImm(0));
2954 else
2955 Inst.addOperand(MCOperand::createImm(4 << align));
2956
2957 return S;
2958}
2959
2960static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Insn,
2961 uint64_t Address,
2962 const MCDisassembler *Decoder) {
2963 DecodeStatus S = MCDisassembler::Success;
2964
2965 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2966 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2967 unsigned wb = fieldFromInstruction(Insn, 16, 4);
2968 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2969 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
2970 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2971
2972 // First output register
2973 switch (Inst.getOpcode()) {
2974 case ARM::VLD1q16: case ARM::VLD1q32: case ARM::VLD1q64: case ARM::VLD1q8:
2975 case ARM::VLD1q16wb_fixed: case ARM::VLD1q16wb_register:
2976 case ARM::VLD1q32wb_fixed: case ARM::VLD1q32wb_register:
2977 case ARM::VLD1q64wb_fixed: case ARM::VLD1q64wb_register:
2978 case ARM::VLD1q8wb_fixed: case ARM::VLD1q8wb_register:
2979 case ARM::VLD2d16: case ARM::VLD2d32: case ARM::VLD2d8:
2980 case ARM::VLD2d16wb_fixed: case ARM::VLD2d16wb_register:
2981 case ARM::VLD2d32wb_fixed: case ARM::VLD2d32wb_register:
2982 case ARM::VLD2d8wb_fixed: case ARM::VLD2d8wb_register:
2983 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2984 return MCDisassembler::Fail;
2985 break;
2986 case ARM::VLD2b16:
2987 case ARM::VLD2b32:
2988 case ARM::VLD2b8:
2989 case ARM::VLD2b16wb_fixed:
2990 case ARM::VLD2b16wb_register:
2991 case ARM::VLD2b32wb_fixed:
2992 case ARM::VLD2b32wb_register:
2993 case ARM::VLD2b8wb_fixed:
2994 case ARM::VLD2b8wb_register:
2995 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2996 return MCDisassembler::Fail;
2997 break;
2998 default:
2999 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3000 return MCDisassembler::Fail;
3001 }
3002
3003 // Second output register
3004 switch (Inst.getOpcode()) {
3005 case ARM::VLD3d8:
3006 case ARM::VLD3d16:
3007 case ARM::VLD3d32:
3008 case ARM::VLD3d8_UPD:
3009 case ARM::VLD3d16_UPD:
3010 case ARM::VLD3d32_UPD:
3011 case ARM::VLD4d8:
3012 case ARM::VLD4d16:
3013 case ARM::VLD4d32:
3014 case ARM::VLD4d8_UPD:
3015 case ARM::VLD4d16_UPD:
3016 case ARM::VLD4d32_UPD:
3017 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
3018 return MCDisassembler::Fail;
3019 break;
3020 case ARM::VLD3q8:
3021 case ARM::VLD3q16:
3022 case ARM::VLD3q32:
3023 case ARM::VLD3q8_UPD:
3024 case ARM::VLD3q16_UPD:
3025 case ARM::VLD3q32_UPD:
3026 case ARM::VLD4q8:
3027 case ARM::VLD4q16:
3028 case ARM::VLD4q32:
3029 case ARM::VLD4q8_UPD:
3030 case ARM::VLD4q16_UPD:
3031 case ARM::VLD4q32_UPD:
3032 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3033 return MCDisassembler::Fail;
3034 break;
3035 default:
3036 break;
3037 }
3038
3039 // Third output register
3040 switch(Inst.getOpcode()) {
3041 case ARM::VLD3d8:
3042 case ARM::VLD3d16:
3043 case ARM::VLD3d32:
3044 case ARM::VLD3d8_UPD:
3045 case ARM::VLD3d16_UPD:
3046 case ARM::VLD3d32_UPD:
3047 case ARM::VLD4d8:
3048 case ARM::VLD4d16:
3049 case ARM::VLD4d32:
3050 case ARM::VLD4d8_UPD:
3051 case ARM::VLD4d16_UPD:
3052 case ARM::VLD4d32_UPD:
3053 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3054 return MCDisassembler::Fail;
3055 break;
3056 case ARM::VLD3q8:
3057 case ARM::VLD3q16:
3058 case ARM::VLD3q32:
3059 case ARM::VLD3q8_UPD:
3060 case ARM::VLD3q16_UPD:
3061 case ARM::VLD3q32_UPD:
3062 case ARM::VLD4q8:
3063 case ARM::VLD4q16:
3064 case ARM::VLD4q32:
3065 case ARM::VLD4q8_UPD:
3066 case ARM::VLD4q16_UPD:
3067 case ARM::VLD4q32_UPD:
3068 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
3069 return MCDisassembler::Fail;
3070 break;
3071 default:
3072 break;
3073 }
3074
3075 // Fourth output register
3076 switch (Inst.getOpcode()) {
3077 case ARM::VLD4d8:
3078 case ARM::VLD4d16:
3079 case ARM::VLD4d32:
3080 case ARM::VLD4d8_UPD:
3081 case ARM::VLD4d16_UPD:
3082 case ARM::VLD4d32_UPD:
3083 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
3084 return MCDisassembler::Fail;
3085 break;
3086 case ARM::VLD4q8:
3087 case ARM::VLD4q16:
3088 case ARM::VLD4q32:
3089 case ARM::VLD4q8_UPD:
3090 case ARM::VLD4q16_UPD:
3091 case ARM::VLD4q32_UPD:
3092 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
3093 return MCDisassembler::Fail;
3094 break;
3095 default:
3096 break;
3097 }
3098
3099 // Writeback operand
3100 switch (Inst.getOpcode()) {
3101 case ARM::VLD1d8wb_fixed:
3102 case ARM::VLD1d16wb_fixed:
3103 case ARM::VLD1d32wb_fixed:
3104 case ARM::VLD1d64wb_fixed:
3105 case ARM::VLD1d8wb_register:
3106 case ARM::VLD1d16wb_register:
3107 case ARM::VLD1d32wb_register:
3108 case ARM::VLD1d64wb_register:
3109 case ARM::VLD1q8wb_fixed:
3110 case ARM::VLD1q16wb_fixed:
3111 case ARM::VLD1q32wb_fixed:
3112 case ARM::VLD1q64wb_fixed:
3113 case ARM::VLD1q8wb_register:
3114 case ARM::VLD1q16wb_register:
3115 case ARM::VLD1q32wb_register:
3116 case ARM::VLD1q64wb_register:
3117 case ARM::VLD1d8Twb_fixed:
3118 case ARM::VLD1d8Twb_register:
3119 case ARM::VLD1d16Twb_fixed:
3120 case ARM::VLD1d16Twb_register:
3121 case ARM::VLD1d32Twb_fixed:
3122 case ARM::VLD1d32Twb_register:
3123 case ARM::VLD1d64Twb_fixed:
3124 case ARM::VLD1d64Twb_register:
3125 case ARM::VLD1d8Qwb_fixed:
3126 case ARM::VLD1d8Qwb_register:
3127 case ARM::VLD1d16Qwb_fixed:
3128 case ARM::VLD1d16Qwb_register:
3129 case ARM::VLD1d32Qwb_fixed:
3130 case ARM::VLD1d32Qwb_register:
3131 case ARM::VLD1d64Qwb_fixed:
3132 case ARM::VLD1d64Qwb_register:
3133 case ARM::VLD2d8wb_fixed:
3134 case ARM::VLD2d16wb_fixed:
3135 case ARM::VLD2d32wb_fixed:
3136 case ARM::VLD2q8wb_fixed:
3137 case ARM::VLD2q16wb_fixed:
3138 case ARM::VLD2q32wb_fixed:
3139 case ARM::VLD2d8wb_register:
3140 case ARM::VLD2d16wb_register:
3141 case ARM::VLD2d32wb_register:
3142 case ARM::VLD2q8wb_register:
3143 case ARM::VLD2q16wb_register:
3144 case ARM::VLD2q32wb_register:
3145 case ARM::VLD2b8wb_fixed:
3146 case ARM::VLD2b16wb_fixed:
3147 case ARM::VLD2b32wb_fixed:
3148 case ARM::VLD2b8wb_register:
3149 case ARM::VLD2b16wb_register:
3150 case ARM::VLD2b32wb_register:
3151 Inst.addOperand(MCOperand::createImm(0));
3152 break;
3153 case ARM::VLD3d8_UPD:
3154 case ARM::VLD3d16_UPD:
3155 case ARM::VLD3d32_UPD:
3156 case ARM::VLD3q8_UPD:
3157 case ARM::VLD3q16_UPD:
3158 case ARM::VLD3q32_UPD:
3159 case ARM::VLD4d8_UPD:
3160 case ARM::VLD4d16_UPD:
3161 case ARM::VLD4d32_UPD:
3162 case ARM::VLD4q8_UPD:
3163 case ARM::VLD4q16_UPD:
3164 case ARM::VLD4q32_UPD:
3165 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
3166 return MCDisassembler::Fail;
3167 break;
3168 default:
3169 break;
3170 }
3171
3172 // AddrMode6 Base (register+alignment)
3173 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
3174 return MCDisassembler::Fail;
3175
3176 // AddrMode6 Offset (register)
3177 switch (Inst.getOpcode()) {
3178 default:
3179 // The below have been updated to have explicit am6offset split
3180 // between fixed and register offset. For those instructions not
3181 // yet updated, we need to add an additional reg0 operand for the
3182 // fixed variant.
3183 //
3184 // The fixed offset encodes as Rm == 0xd, so we check for that.
3185 if (Rm == 0xd) {
3186 Inst.addOperand(MCOperand::createReg(0));
3187 break;
3188 }
3189 // Fall through to handle the register offset variant.
3190 [[fallthrough]];
3191 case ARM::VLD1d8wb_fixed:
3192 case ARM::VLD1d16wb_fixed:
3193 case ARM::VLD1d32wb_fixed:
3194 case ARM::VLD1d64wb_fixed:
3195 case ARM::VLD1d8Twb_fixed:
3196 case ARM::VLD1d16Twb_fixed:
3197 case ARM::VLD1d32Twb_fixed:
3198 case ARM::VLD1d64Twb_fixed:
3199 case ARM::VLD1d8Qwb_fixed:
3200 case ARM::VLD1d16Qwb_fixed:
3201 case ARM::VLD1d32Qwb_fixed:
3202 case ARM::VLD1d64Qwb_fixed:
3203 case ARM::VLD1d8wb_register:
3204 case ARM::VLD1d16wb_register:
3205 case ARM::VLD1d32wb_register:
3206 case ARM::VLD1d64wb_register:
3207 case ARM::VLD1q8wb_fixed:
3208 case ARM::VLD1q16wb_fixed:
3209 case ARM::VLD1q32wb_fixed:
3210 case ARM::VLD1q64wb_fixed:
3211 case ARM::VLD1q8wb_register:
3212 case ARM::VLD1q16wb_register:
3213 case ARM::VLD1q32wb_register:
3214 case ARM::VLD1q64wb_register:
3215 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
3216 // variant encodes Rm == 0xf. Anything else is a register offset post-
3217 // increment and we need to add the register operand to the instruction.
3218 if (Rm != 0xD && Rm != 0xF &&
3219 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3220 return MCDisassembler::Fail;
3221 break;
3222 case ARM::VLD2d8wb_fixed:
3223 case ARM::VLD2d16wb_fixed:
3224 case ARM::VLD2d32wb_fixed:
3225 case ARM::VLD2b8wb_fixed:
3226 case ARM::VLD2b16wb_fixed:
3227 case ARM::VLD2b32wb_fixed:
3228 case ARM::VLD2q8wb_fixed:
3229 case ARM::VLD2q16wb_fixed:
3230 case ARM::VLD2q32wb_fixed:
3231 break;
3232 }
3233
3234 return S;
3235}
3236
3237static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Insn,
3238 uint64_t Address,
3239 const MCDisassembler *Decoder) {
3240 unsigned type = fieldFromInstruction(Insn, 8, 4);
3241 unsigned align = fieldFromInstruction(Insn, 4, 2);
3242 if (type == 6 && (align & 2)) return MCDisassembler::Fail;
3243 if (type == 7 && (align & 2)) return MCDisassembler::Fail;
3244 if (type == 10 && align == 3) return MCDisassembler::Fail;
3245
3246 unsigned load = fieldFromInstruction(Insn, 21, 1);
3247 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3248 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3249}
3250
3251static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Insn,
3252 uint64_t Address,
3253 const MCDisassembler *Decoder) {
3254 unsigned size = fieldFromInstruction(Insn, 6, 2);
3255 if (size == 3) return MCDisassembler::Fail;
3256
3257 unsigned type = fieldFromInstruction(Insn, 8, 4);
3258 unsigned align = fieldFromInstruction(Insn, 4, 2);
3259 if (type == 8 && align == 3) return MCDisassembler::Fail;
3260 if (type == 9 && align == 3) return MCDisassembler::Fail;
3261
3262 unsigned load = fieldFromInstruction(Insn, 21, 1);
3263 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3264 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3265}
3266
3267static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Insn,
3268 uint64_t Address,
3269 const MCDisassembler *Decoder) {
3270 unsigned size = fieldFromInstruction(Insn, 6, 2);
3271 if (size == 3) return MCDisassembler::Fail;
3272
3273 unsigned align = fieldFromInstruction(Insn, 4, 2);
3274 if (align & 2) return MCDisassembler::Fail;
3275
3276 unsigned load = fieldFromInstruction(Insn, 21, 1);
3277 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3278 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3279}
3280
3281static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Insn,
3282 uint64_t Address,
3283 const MCDisassembler *Decoder) {
3284 unsigned size = fieldFromInstruction(Insn, 6, 2);
3285 if (size == 3) return MCDisassembler::Fail;
3286
3287 unsigned load = fieldFromInstruction(Insn, 21, 1);
3288 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
3289 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
3290}
3291
3292static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Insn,
3293 uint64_t Address,
3294 const MCDisassembler *Decoder) {
3295 DecodeStatus S = MCDisassembler::Success;
3296
3297 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3298 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3299 unsigned wb = fieldFromInstruction(Insn, 16, 4);
3300 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3301 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
3302 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3303
3304 // Writeback Operand
3305 switch (Inst.getOpcode()) {
3306 case ARM::VST1d8wb_fixed:
3307 case ARM::VST1d16wb_fixed:
3308 case ARM::VST1d32wb_fixed:
3309 case ARM::VST1d64wb_fixed:
3310 case ARM::VST1d8wb_register:
3311 case ARM::VST1d16wb_register:
3312 case ARM::VST1d32wb_register:
3313 case ARM::VST1d64wb_register:
3314 case ARM::VST1q8wb_fixed:
3315 case ARM::VST1q16wb_fixed:
3316 case ARM::VST1q32wb_fixed:
3317 case ARM::VST1q64wb_fixed:
3318 case ARM::VST1q8wb_register:
3319 case ARM::VST1q16wb_register:
3320 case ARM::VST1q32wb_register:
3321 case ARM::VST1q64wb_register:
3322 case ARM::VST1d8Twb_fixed:
3323 case ARM::VST1d16Twb_fixed:
3324 case ARM::VST1d32Twb_fixed:
3325 case ARM::VST1d64Twb_fixed:
3326 case ARM::VST1d8Twb_register:
3327 case ARM::VST1d16Twb_register:
3328 case ARM::VST1d32Twb_register:
3329 case ARM::VST1d64Twb_register:
3330 case ARM::VST1d8Qwb_fixed:
3331 case ARM::VST1d16Qwb_fixed:
3332 case ARM::VST1d32Qwb_fixed:
3333 case ARM::VST1d64Qwb_fixed:
3334 case ARM::VST1d8Qwb_register:
3335 case ARM::VST1d16Qwb_register:
3336 case ARM::VST1d32Qwb_register:
3337 case ARM::VST1d64Qwb_register:
3338 case ARM::VST2d8wb_fixed:
3339 case ARM::VST2d16wb_fixed:
3340 case ARM::VST2d32wb_fixed:
3341 case ARM::VST2d8wb_register:
3342 case ARM::VST2d16wb_register:
3343 case ARM::VST2d32wb_register:
3344 case ARM::VST2q8wb_fixed:
3345 case ARM::VST2q16wb_fixed:
3346 case ARM::VST2q32wb_fixed:
3347 case ARM::VST2q8wb_register:
3348 case ARM::VST2q16wb_register:
3349 case ARM::VST2q32wb_register:
3350 case ARM::VST2b8wb_fixed:
3351 case ARM::VST2b16wb_fixed:
3352 case ARM::VST2b32wb_fixed:
3353 case ARM::VST2b8wb_register:
3354 case ARM::VST2b16wb_register:
3355 case ARM::VST2b32wb_register:
3356 if (Rm == 0xF)
3357 return MCDisassembler::Fail;
3358 Inst.addOperand(MCOperand::createImm(0));
3359 break;
3360 case ARM::VST3d8_UPD:
3361 case ARM::VST3d16_UPD:
3362 case ARM::VST3d32_UPD:
3363 case ARM::VST3q8_UPD:
3364 case ARM::VST3q16_UPD:
3365 case ARM::VST3q32_UPD:
3366 case ARM::VST4d8_UPD:
3367 case ARM::VST4d16_UPD:
3368 case ARM::VST4d32_UPD:
3369 case ARM::VST4q8_UPD:
3370 case ARM::VST4q16_UPD:
3371 case ARM::VST4q32_UPD:
3372 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
3373 return MCDisassembler::Fail;
3374 break;
3375 default:
3376 break;
3377 }
3378
3379 // AddrMode6 Base (register+alignment)
3380 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
3381 return MCDisassembler::Fail;
3382
3383 // AddrMode6 Offset (register)
3384 switch (Inst.getOpcode()) {
3385 default:
3386 if (Rm == 0xD)
3387 Inst.addOperand(MCOperand::createReg(0));
3388 else if (Rm != 0xF) {
3389 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3390 return MCDisassembler::Fail;
3391 }
3392 break;
3393 case ARM::VST1d8wb_fixed:
3394 case ARM::VST1d16wb_fixed:
3395 case ARM::VST1d32wb_fixed:
3396 case ARM::VST1d64wb_fixed:
3397 case ARM::VST1q8wb_fixed:
3398 case ARM::VST1q16wb_fixed:
3399 case ARM::VST1q32wb_fixed:
3400 case ARM::VST1q64wb_fixed:
3401 case ARM::VST1d8Twb_fixed:
3402 case ARM::VST1d16Twb_fixed:
3403 case ARM::VST1d32Twb_fixed:
3404 case ARM::VST1d64Twb_fixed:
3405 case ARM::VST1d8Qwb_fixed:
3406 case ARM::VST1d16Qwb_fixed:
3407 case ARM::VST1d32Qwb_fixed:
3408 case ARM::VST1d64Qwb_fixed:
3409 case ARM::VST2d8wb_fixed:
3410 case ARM::VST2d16wb_fixed:
3411 case ARM::VST2d32wb_fixed:
3412 case ARM::VST2q8wb_fixed:
3413 case ARM::VST2q16wb_fixed:
3414 case ARM::VST2q32wb_fixed:
3415 case ARM::VST2b8wb_fixed:
3416 case ARM::VST2b16wb_fixed:
3417 case ARM::VST2b32wb_fixed:
3418 break;
3419 }
3420
3421 // First input register
3422 switch (Inst.getOpcode()) {
3423 case ARM::VST1q16:
3424 case ARM::VST1q32:
3425 case ARM::VST1q64:
3426 case ARM::VST1q8:
3427 case ARM::VST1q16wb_fixed:
3428 case ARM::VST1q16wb_register:
3429 case ARM::VST1q32wb_fixed:
3430 case ARM::VST1q32wb_register:
3431 case ARM::VST1q64wb_fixed:
3432 case ARM::VST1q64wb_register:
3433 case ARM::VST1q8wb_fixed:
3434 case ARM::VST1q8wb_register:
3435 case ARM::VST2d16:
3436 case ARM::VST2d32:
3437 case ARM::VST2d8:
3438 case ARM::VST2d16wb_fixed:
3439 case ARM::VST2d16wb_register:
3440 case ARM::VST2d32wb_fixed:
3441 case ARM::VST2d32wb_register:
3442 case ARM::VST2d8wb_fixed:
3443 case ARM::VST2d8wb_register:
3444 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3445 return MCDisassembler::Fail;
3446 break;
3447 case ARM::VST2b16:
3448 case ARM::VST2b32:
3449 case ARM::VST2b8:
3450 case ARM::VST2b16wb_fixed:
3451 case ARM::VST2b16wb_register:
3452 case ARM::VST2b32wb_fixed:
3453 case ARM::VST2b32wb_register:
3454 case ARM::VST2b8wb_fixed:
3455 case ARM::VST2b8wb_register:
3456 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
3457 return MCDisassembler::Fail;
3458 break;
3459 default:
3460 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3461 return MCDisassembler::Fail;
3462 }
3463
3464 // Second input register
3465 switch (Inst.getOpcode()) {
3466 case ARM::VST3d8:
3467 case ARM::VST3d16:
3468 case ARM::VST3d32:
3469 case ARM::VST3d8_UPD:
3470 case ARM::VST3d16_UPD:
3471 case ARM::VST3d32_UPD:
3472 case ARM::VST4d8:
3473 case ARM::VST4d16:
3474 case ARM::VST4d32:
3475 case ARM::VST4d8_UPD:
3476 case ARM::VST4d16_UPD:
3477 case ARM::VST4d32_UPD:
3478 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
3479 return MCDisassembler::Fail;
3480 break;
3481 case ARM::VST3q8:
3482 case ARM::VST3q16:
3483 case ARM::VST3q32:
3484 case ARM::VST3q8_UPD:
3485 case ARM::VST3q16_UPD:
3486 case ARM::VST3q32_UPD:
3487 case ARM::VST4q8:
3488 case ARM::VST4q16:
3489 case ARM::VST4q32:
3490 case ARM::VST4q8_UPD:
3491 case ARM::VST4q16_UPD:
3492 case ARM::VST4q32_UPD:
3493 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3494 return MCDisassembler::Fail;
3495 break;
3496 default:
3497 break;
3498 }
3499
3500 // Third input register
3501 switch (Inst.getOpcode()) {
3502 case ARM::VST3d8:
3503 case ARM::VST3d16:
3504 case ARM::VST3d32:
3505 case ARM::VST3d8_UPD:
3506 case ARM::VST3d16_UPD:
3507 case ARM::VST3d32_UPD:
3508 case ARM::VST4d8:
3509 case ARM::VST4d16:
3510 case ARM::VST4d32:
3511 case ARM::VST4d8_UPD:
3512 case ARM::VST4d16_UPD:
3513 case ARM::VST4d32_UPD:
3514 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
3515 return MCDisassembler::Fail;
3516 break;
3517 case ARM::VST3q8:
3518 case ARM::VST3q16:
3519 case ARM::VST3q32:
3520 case ARM::VST3q8_UPD:
3521 case ARM::VST3q16_UPD:
3522 case ARM::VST3q32_UPD:
3523 case ARM::VST4q8:
3524 case ARM::VST4q16:
3525 case ARM::VST4q32:
3526 case ARM::VST4q8_UPD:
3527 case ARM::VST4q16_UPD:
3528 case ARM::VST4q32_UPD:
3529 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
3530 return MCDisassembler::Fail;
3531 break;
3532 default:
3533 break;
3534 }
3535
3536 // Fourth input register
3537 switch (Inst.getOpcode()) {
3538 case ARM::VST4d8:
3539 case ARM::VST4d16:
3540 case ARM::VST4d32:
3541 case ARM::VST4d8_UPD:
3542 case ARM::VST4d16_UPD:
3543 case ARM::VST4d32_UPD:
3544 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
3545 return MCDisassembler::Fail;
3546 break;
3547 case ARM::VST4q8:
3548 case ARM::VST4q16:
3549 case ARM::VST4q32:
3550 case ARM::VST4q8_UPD:
3551 case ARM::VST4q16_UPD:
3552 case ARM::VST4q32_UPD:
3553 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
3554 return MCDisassembler::Fail;
3555 break;
3556 default:
3557 break;
3558 }
3559
3560 return S;
3561}
3562
3563static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Insn,
3564 uint64_t Address,
3565 const MCDisassembler *Decoder) {
3566 DecodeStatus S = MCDisassembler::Success;
3567
3568 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3569 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3570 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3571 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3572 unsigned align = fieldFromInstruction(Insn, 4, 1);
3573 unsigned size = fieldFromInstruction(Insn, 6, 2);
3574
3575 if (size == 0 && align == 1)
3576 return MCDisassembler::Fail;
3577 align *= (1 << size);
3578
3579 switch (Inst.getOpcode()) {
3580 case ARM::VLD1DUPq16: case ARM::VLD1DUPq32: case ARM::VLD1DUPq8:
3581 case ARM::VLD1DUPq16wb_fixed: case ARM::VLD1DUPq16wb_register:
3582 case ARM::VLD1DUPq32wb_fixed: case ARM::VLD1DUPq32wb_register:
3583 case ARM::VLD1DUPq8wb_fixed: case ARM::VLD1DUPq8wb_register:
3584 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3585 return MCDisassembler::Fail;
3586 break;
3587 default:
3588 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3589 return MCDisassembler::Fail;
3590 break;
3591 }
3592 if (Rm != 0xF) {
3593 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3594 return MCDisassembler::Fail;
3595 }
3596
3597 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3598 return MCDisassembler::Fail;
3599 Inst.addOperand(MCOperand::createImm(align));
3600
3601 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
3602 // variant encodes Rm == 0xf. Anything else is a register offset post-
3603 // increment and we need to add the register operand to the instruction.
3604 if (Rm != 0xD && Rm != 0xF &&
3605 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3606 return MCDisassembler::Fail;
3607
3608 return S;
3609}
3610
3611static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Insn,
3612 uint64_t Address,
3613 const MCDisassembler *Decoder) {
3614 DecodeStatus S = MCDisassembler::Success;
3615
3616 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3617 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3618 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3619 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3620 unsigned align = fieldFromInstruction(Insn, 4, 1);
3621 unsigned size = 1 << fieldFromInstruction(Insn, 6, 2);
3622 align *= 2*size;
3623
3624 switch (Inst.getOpcode()) {
3625 case ARM::VLD2DUPd16: case ARM::VLD2DUPd32: case ARM::VLD2DUPd8:
3626 case ARM::VLD2DUPd16wb_fixed: case ARM::VLD2DUPd16wb_register:
3627 case ARM::VLD2DUPd32wb_fixed: case ARM::VLD2DUPd32wb_register:
3628 case ARM::VLD2DUPd8wb_fixed: case ARM::VLD2DUPd8wb_register:
3629 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
3630 return MCDisassembler::Fail;
3631 break;
3632 case ARM::VLD2DUPd16x2: case ARM::VLD2DUPd32x2: case ARM::VLD2DUPd8x2:
3633 case ARM::VLD2DUPd16x2wb_fixed: case ARM::VLD2DUPd16x2wb_register:
3634 case ARM::VLD2DUPd32x2wb_fixed: case ARM::VLD2DUPd32x2wb_register:
3635 case ARM::VLD2DUPd8x2wb_fixed: case ARM::VLD2DUPd8x2wb_register:
3636 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
3637 return MCDisassembler::Fail;
3638 break;
3639 default:
3640 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3641 return MCDisassembler::Fail;
3642 break;
3643 }
3644
3645 if (Rm != 0xF)
3646 Inst.addOperand(MCOperand::createImm(0));
3647
3648 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3649 return MCDisassembler::Fail;
3650 Inst.addOperand(MCOperand::createImm(align));
3651
3652 if (Rm != 0xD && Rm != 0xF) {
3653 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3654 return MCDisassembler::Fail;
3655 }
3656
3657 return S;
3658}
3659
3660static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Insn,
3661 uint64_t Address,
3662 const MCDisassembler *Decoder) {
3663 DecodeStatus S = MCDisassembler::Success;
3664
3665 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3666 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3667 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3668 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3669 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
3670
3671 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3672 return MCDisassembler::Fail;
3673 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
3674 return MCDisassembler::Fail;
3675 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
3676 return MCDisassembler::Fail;
3677 if (Rm != 0xF) {
3678 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3679 return MCDisassembler::Fail;
3680 }
3681
3682 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3683 return MCDisassembler::Fail;
3684 Inst.addOperand(MCOperand::createImm(0));
3685
3686 if (Rm == 0xD)
3687 Inst.addOperand(MCOperand::createReg(0));
3688 else if (Rm != 0xF) {
3689 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3690 return MCDisassembler::Fail;
3691 }
3692
3693 return S;
3694}
3695
3696static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Insn,
3697 uint64_t Address,
3698 const MCDisassembler *Decoder) {
3699 DecodeStatus S = MCDisassembler::Success;
3700
3701 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3702 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3703 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3704 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3705 unsigned size = fieldFromInstruction(Insn, 6, 2);
3706 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
3707 unsigned align = fieldFromInstruction(Insn, 4, 1);
3708
3709 if (size == 0x3) {
3710 if (align == 0)
3711 return MCDisassembler::Fail;
3712 align = 16;
3713 } else {
3714 if (size == 2) {
3715 align *= 8;
3716 } else {
3717 size = 1 << size;
3718 align *= 4*size;
3719 }
3720 }
3721
3722 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3723 return MCDisassembler::Fail;
3724 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
3725 return MCDisassembler::Fail;
3726 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
3727 return MCDisassembler::Fail;
3728 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder)))
3729 return MCDisassembler::Fail;
3730 if (Rm != 0xF) {
3731 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3732 return MCDisassembler::Fail;
3733 }
3734
3735 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3736 return MCDisassembler::Fail;
3737 Inst.addOperand(MCOperand::createImm(align));
3738
3739 if (Rm == 0xD)
3740 Inst.addOperand(MCOperand::createReg(0));
3741 else if (Rm != 0xF) {
3742 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3743 return MCDisassembler::Fail;
3744 }
3745
3746 return S;
3747}
3748
3749static DecodeStatus DecodeVMOVModImmInstruction(MCInst &Inst, unsigned Insn,
3750 uint64_t Address,
3751 const MCDisassembler *Decoder) {
3752 DecodeStatus S = MCDisassembler::Success;
3753
3754 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3755 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3756 unsigned imm = fieldFromInstruction(Insn, 0, 4);
3757 imm |= fieldFromInstruction(Insn, 16, 3) << 4;
3758 imm |= fieldFromInstruction(Insn, 24, 1) << 7;
3759 imm |= fieldFromInstruction(Insn, 8, 4) << 8;
3760 imm |= fieldFromInstruction(Insn, 5, 1) << 12;
3761 unsigned Q = fieldFromInstruction(Insn, 6, 1);
3762
3763 if (Q) {
3764 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3765 return MCDisassembler::Fail;
3766 } else {
3767 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3768 return MCDisassembler::Fail;
3769 }
3770
3771 Inst.addOperand(MCOperand::createImm(imm));
3772
3773 switch (Inst.getOpcode()) {
3774 case ARM::VORRiv4i16:
3775 case ARM::VORRiv2i32:
3776 case ARM::VBICiv4i16:
3777 case ARM::VBICiv2i32:
3778 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3779 return MCDisassembler::Fail;
3780 break;
3781 case ARM::VORRiv8i16:
3782 case ARM::VORRiv4i32:
3783 case ARM::VBICiv8i16:
3784 case ARM::VBICiv4i32:
3785 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3786 return MCDisassembler::Fail;
3787 break;
3788 default:
3789 break;
3790 }
3791
3792 return S;
3793}
3794
3795static DecodeStatus DecodeMVEModImmInstruction(MCInst &Inst, unsigned Insn,
3796 uint64_t Address,
3797 const MCDisassembler *Decoder) {
3798 DecodeStatus S = MCDisassembler::Success;
3799
3800 unsigned Qd = ((fieldFromInstruction(Insn, 22, 1) << 3) |
3801 fieldFromInstruction(Insn, 13, 3));
3802 unsigned cmode = fieldFromInstruction(Insn, 8, 4);
3803 unsigned imm = fieldFromInstruction(Insn, 0, 4);
3804 imm |= fieldFromInstruction(Insn, 16, 3) << 4;
3805 imm |= fieldFromInstruction(Insn, 28, 1) << 7;
3806 imm |= cmode << 8;
3807 imm |= fieldFromInstruction(Insn, 5, 1) << 12;
3808
3809 if (cmode == 0xF && Inst.getOpcode() == ARM::MVE_VMVNimmi32)
3810 return MCDisassembler::Fail;
3811
3812 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
3813 return MCDisassembler::Fail;
3814
3815 Inst.addOperand(MCOperand::createImm(imm));
3816
3817 Inst.addOperand(MCOperand::createImm(ARMVCC::None));
3818 Inst.addOperand(MCOperand::createReg(0));
3819 Inst.addOperand(MCOperand::createImm(0));
3820
3821 return S;
3822}
3823
3824static DecodeStatus DecodeMVEVADCInstruction(MCInst &Inst, unsigned Insn,
3825 uint64_t Address,
3826 const MCDisassembler *Decoder) {
3827 DecodeStatus S = MCDisassembler::Success;
3828
3829 unsigned Qd = fieldFromInstruction(Insn, 13, 3);
3830 Qd |= fieldFromInstruction(Insn, 22, 1) << 3;
3831 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
3832 return MCDisassembler::Fail;
3833 Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
3834
3835 unsigned Qn = fieldFromInstruction(Insn, 17, 3);
3836 Qn |= fieldFromInstruction(Insn, 7, 1) << 3;
3837 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qn, Address, Decoder)))
3838 return MCDisassembler::Fail;
3839 unsigned Qm = fieldFromInstruction(Insn, 1, 3);
3840 Qm |= fieldFromInstruction(Insn, 5, 1) << 3;
3841 if (!Check(S, DecodeMQPRRegisterClass(Inst, Qm, Address, Decoder)))
3842 return MCDisassembler::Fail;
3843 if (!fieldFromInstruction(Insn, 12, 1)) // I bit clear => need input FPSCR
3844 Inst.addOperand(MCOperand::createReg(ARM::FPSCR_NZCV));
3845 Inst.addOperand(MCOperand::createImm(Qd));
3846
3847 return S;
3848}
3849
3850static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Insn,
3851 uint64_t Address,
3852 const MCDisassembler *Decoder) {
3853 DecodeStatus S = MCDisassembler::Success;
3854
3855 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3856 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3857 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3858 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3859 unsigned size = fieldFromInstruction(Insn, 18, 2);
3860
3861 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3862 return MCDisassembler::Fail;
3863 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3864 return MCDisassembler::Fail;
3865 Inst.addOperand(MCOperand::createImm(8 << size));
3866
3867 return S;
3868}
3869
3870static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
3871 uint64_t Address,
3872 const MCDisassembler *Decoder) {
3873 Inst.addOperand(MCOperand::createImm(8 - Val));
3874 return MCDisassembler::Success;
3875}
3876
3877static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
3878 uint64_t Address,
3879 const MCDisassembler *Decoder) {
3880 Inst.addOperand(MCOperand::createImm(16 - Val));
3881 return MCDisassembler::Success;
3882}
3883
3884static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
3885 uint64_t Address,
3886 const MCDisassembler *Decoder) {
3887 Inst.addOperand(MCOperand::createImm(32 - Val));
3888 return MCDisassembler::Success;
3889}
3890
3891static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
3892 uint64_t Address,
3893 const MCDisassembler *Decoder) {
3894 Inst.addOperand(MCOperand::createImm(64 - Val));
3895 return MCDisassembler::Success;
3896}
3897
3898static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
3899 uint64_t Address,
3900 const MCDisassembler *Decoder) {
3901 DecodeStatus S = MCDisassembler::Success;
3902
3903 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3904 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3905 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3906 Rn |= fieldFromInstruction(Insn, 7, 1) << 4;
3907 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3908 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3909 unsigned op = fieldFromInstruction(Insn, 6, 1);
3910
3911 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3912 return MCDisassembler::Fail;
3913 if (op) {
3914 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3915 return MCDisassembler::Fail; // Writeback
3916 }
3917
3918 switch (Inst.getOpcode()) {
3919 case ARM::VTBL2:
3920 case ARM::VTBX2:
3921 if (!Check(S, DecodeDPairRegisterClass(Inst, Rn, Address, Decoder)))
3922 return MCDisassembler::Fail;
3923 break;
3924 default:
3925 if (!Check(S, DecodeDPRRegisterClass(Inst, Rn, Address, Decoder)))
3926 return MCDisassembler::Fail;
3927 }
3928
3929 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3930 return MCDisassembler::Fail;
3931
3932 return S;
3933}
3934
3935static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
3936 uint64_t Address,
3937 const MCDisassembler *Decoder) {
3938 DecodeStatus S = MCDisassembler::Success;
3939
3940 unsigned dst = fieldFromInstruction(Insn, 8, 3);
3941 unsigned imm = fieldFromInstruction(Insn, 0, 8);
3942
3943 if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder)))
3944 return MCDisassembler::Fail;
3945
3946 switch(Inst.getOpcode()) {
3947 default:
3948 return MCDisassembler::Fail;
3949 case ARM::tADR:
3950 break; // tADR does not explicitly represent the PC as an operand.
3951 case ARM::tADDrSPi:
3952 Inst.addOperand(MCOperand::createReg(ARM::SP));
3953 break;
3954 }
3955
3956 Inst.addOperand(MCOperand::createImm(imm));
3957 return S;
3958}
3959
3960static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
3961 uint64_t Address,
3962 const MCDisassembler *Decoder) {
3963 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<12>(Val<<1) + 4,
3964 true, 2, Inst, Decoder))
3965 Inst.addOperand(MCOperand::createImm(SignExtend32<12>(Val << 1)));
3966 return MCDisassembler::Success;
3967}
3968
3969static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
3970 uint64_t Address,
3971 const MCDisassembler *Decoder) {
3972 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<21>(Val) + 4,
3973 true, 4, Inst, Decoder))
3974 Inst.addOperand(MCOperand::createImm(SignExtend32<21>(Val)));
3975 return MCDisassembler::Success;
3976}
3977
3978static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
3979 uint64_t Address,
3980 const MCDisassembler *Decoder) {
3981 if (!tryAddingSymbolicOperand(Address, Address + (Val<<1) + 4,
3982 true, 2, Inst, Decoder))
3983 Inst.addOperand(MCOperand::createImm(Val << 1));
3984 return MCDisassembler::Success;
3985}
3986
3987static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
3988 uint64_t Address,
3989 const MCDisassembler *Decoder) {
3990 DecodeStatus S = MCDisassembler::Success;
3991
3992 unsigned Rn = fieldFromInstruction(Val, 0, 3);
3993 unsigned Rm = fieldFromInstruction(Val, 3, 3);
3994
3995 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
3996 return MCDisassembler::Fail;
3997 if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder)))
3998 return MCDisassembler::Fail;
3999
4000 return S;
4001}
4002
4003static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
4004 uint64_t Address,
4005 const MCDisassembler *Decoder) {
4006 DecodeStatus S = MCDisassembler::Success;
4007
4008 unsigned Rn = fieldFromInstruction(Val, 0, 3);
4009 unsigned imm = fieldFromInstruction(Val, 3, 5);
4010
4011 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
4012 return MCDisassembler::Fail;
4013 Inst.addOperand(MCOperand::createImm(imm));
4014
4015 return S;
4016}
4017
4018static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
4019 uint64_t Address,
4020 const MCDisassembler *Decoder) {
4021 unsigned imm = Val << 2;
4022
4023 Inst.addOperand(MCOperand::createImm(imm));
4024 tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder);
4025
4026 return MCDisassembler::Success;
4027}
4028
4029static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
4030 uint64_t Address,
4031 const MCDisassembler *Decoder) {
4032 Inst.addOperand(MCOperand::createReg(ARM::SP));
4033 Inst.addOperand(MCOperand::createImm(Val));
4034
4035 return MCDisassembler::Success;
4036}
4037
4038static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
4039 uint64_t Address,
4040 const MCDisassembler *Decoder) {
4041 DecodeStatus S = MCDisassembler::Success;
4042
4043 unsigned Rn = fieldFromInstruction(Val, 6, 4);
4044 unsigned Rm = fieldFromInstruction(Val, 2, 4);
4045 unsigned imm = fieldFromInstruction(Val, 0, 2);
4046
4047 // Thumb stores cannot use PC as dest register.
4048 switch (Inst.getOpcode()) {
4049 case ARM::t2STRHs:
4050 case ARM::t2STRBs:
4051 case ARM::t2STRs:
4052 if (Rn == 15)
4053 return MCDisassembler::Fail;
4054 break;
4055 default:
4056 break;
4057 }
4058
4059 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4060 return MCDisassembler::Fail;
4061 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
4062 return MCDisassembler::Fail;
4063 Inst.addOperand(MCOperand::createImm(imm));
4064
4065 return S;
4066}
4067
4068static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Insn,
4069 uint64_t Address,
4070 const MCDisassembler *Decoder) {
4071 DecodeStatus S = MCDisassembler::Success;
4072
4073 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4074 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4075
4076 const FeatureBitset &featureBits =
4077 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4078
4079 bool hasMP = featureBits[ARM::FeatureMP];
4080 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4081
4082 if (Rn == 15) {
4083 switch (Inst.getOpcode()) {
4084 case ARM::t2LDRBs:
4085 Inst.setOpcode(ARM::t2LDRBpci);
4086 break;
4087 case ARM::t2LDRHs:
4088 Inst.setOpcode(ARM::t2LDRHpci);
4089 break;
4090 case ARM::t2LDRSHs:
4091 Inst.setOpcode(ARM::t2LDRSHpci);
4092 break;
4093 case ARM::t2LDRSBs:
4094 Inst.setOpcode(ARM::t2LDRSBpci);
4095 break;
4096 case ARM::t2LDRs:
4097 Inst.setOpcode(ARM::t2LDRpci);
4098 break;
4099 case ARM::t2PLDs:
4100 Inst.setOpcode(ARM::t2PLDpci);
4101 break;
4102 case ARM::t2PLIs:
4103 Inst.setOpcode(ARM::t2PLIpci);
4104 break;
4105 default:
4106 return MCDisassembler::Fail;
4107 }
4108
4109 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4110 }
4111
4112 if (Rt == 15) {
4113 switch (Inst.getOpcode()) {
4114 case ARM::t2LDRSHs:
4115 return MCDisassembler::Fail;
4116 case ARM::t2LDRHs:
4117 Inst.setOpcode(ARM::t2PLDWs);
4118 break;
4119 case ARM::t2LDRSBs:
4120 Inst.setOpcode(ARM::t2PLIs);
4121 break;
4122 default:
4123 break;
4124 }
4125 }
4126
4127 switch (Inst.getOpcode()) {
4128 case ARM::t2PLDs:
4129 break;
4130 case ARM::t2PLIs:
4131 if (!hasV7Ops)
4132 return MCDisassembler::Fail;
4133 break;
4134 case ARM::t2PLDWs:
4135 if (!hasV7Ops || !hasMP)
4136 return MCDisassembler::Fail;
4137 break;
4138 default:
4139 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4140 return MCDisassembler::Fail;
4141 }
4142
4143 unsigned addrmode = fieldFromInstruction(Insn, 4, 2);
4144 addrmode |= fieldFromInstruction(Insn, 0, 4) << 2;
4145 addrmode |= fieldFromInstruction(Insn, 16, 4) << 6;
4146 if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder)))
4147 return MCDisassembler::Fail;
4148
4149 return S;
4150}
4151
4152static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
4153 uint64_t Address,
4154 const MCDisassembler *Decoder) {
4155 DecodeStatus S = MCDisassembler::Success;
4156
4157 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4158 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4159 unsigned U = fieldFromInstruction(Insn, 9, 1);
4160 unsigned imm = fieldFromInstruction(Insn, 0, 8);
4161 imm |= (U << 8);
4162 imm |= (Rn << 9);
4163 unsigned add = fieldFromInstruction(Insn, 9, 1);
4164
4165 const FeatureBitset &featureBits =
4166 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4167
4168 bool hasMP = featureBits[ARM::FeatureMP];
4169 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4170
4171 if (Rn == 15) {
4172 switch (Inst.getOpcode()) {
4173 case ARM::t2LDRi8:
4174 Inst.setOpcode(ARM::t2LDRpci);
4175 break;
4176 case ARM::t2LDRBi8:
4177 Inst.setOpcode(ARM::t2LDRBpci);
4178 break;
4179 case ARM::t2LDRSBi8:
4180 Inst.setOpcode(ARM::t2LDRSBpci);
4181 break;
4182 case ARM::t2LDRHi8:
4183 Inst.setOpcode(ARM::t2LDRHpci);
4184 break;
4185 case ARM::t2LDRSHi8:
4186 Inst.setOpcode(ARM::t2LDRSHpci);
4187 break;
4188 case ARM::t2PLDi8:
4189 Inst.setOpcode(ARM::t2PLDpci);
4190 break;
4191 case ARM::t2PLIi8:
4192 Inst.setOpcode(ARM::t2PLIpci);
4193 break;
4194 default:
4195 return MCDisassembler::Fail;
4196 }
4197 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4198 }
4199
4200 if (Rt == 15) {
4201 switch (Inst.getOpcode()) {
4202 case ARM::t2LDRSHi8:
4203 return MCDisassembler::Fail;
4204 case ARM::t2LDRHi8:
4205 if (!add)
4206 Inst.setOpcode(ARM::t2PLDWi8);
4207 break;
4208 case ARM::t2LDRSBi8:
4209 Inst.setOpcode(ARM::t2PLIi8);
4210 break;
4211 default:
4212 break;
4213 }
4214 }
4215
4216 switch (Inst.getOpcode()) {
4217 case ARM::t2PLDi8:
4218 break;
4219 case ARM::t2PLIi8:
4220 if (!hasV7Ops)
4221 return MCDisassembler::Fail;
4222 break;
4223 case ARM::t2PLDWi8:
4224 if (!hasV7Ops || !hasMP)
4225 return MCDisassembler::Fail;
4226 break;
4227 default:
4228 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4229 return MCDisassembler::Fail;
4230 }
4231
4232 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
4233 return MCDisassembler::Fail;
4234 return S;
4235}
4236
4237static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
4238 uint64_t Address,
4239 const MCDisassembler *Decoder) {
4240 DecodeStatus S = MCDisassembler::Success;
4241
4242 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4243 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4244 unsigned imm = fieldFromInstruction(Insn, 0, 12);
4245 imm |= (Rn << 13);
4246
4247 const FeatureBitset &featureBits =
4248 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4249
4250 bool hasMP = featureBits[ARM::FeatureMP];
4251 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4252
4253 if (Rn == 15) {
4254 switch (Inst.getOpcode()) {
4255 case ARM::t2LDRi12:
4256 Inst.setOpcode(ARM::t2LDRpci);
4257 break;
4258 case ARM::t2LDRHi12:
4259 Inst.setOpcode(ARM::t2LDRHpci);
4260 break;
4261 case ARM::t2LDRSHi12:
4262 Inst.setOpcode(ARM::t2LDRSHpci);
4263 break;
4264 case ARM::t2LDRBi12:
4265 Inst.setOpcode(ARM::t2LDRBpci);
4266 break;
4267 case ARM::t2LDRSBi12:
4268 Inst.setOpcode(ARM::t2LDRSBpci);
4269 break;
4270 case ARM::t2PLDi12:
4271 Inst.setOpcode(ARM::t2PLDpci);
4272 break;
4273 case ARM::t2PLIi12:
4274 Inst.setOpcode(ARM::t2PLIpci);
4275 break;
4276 default:
4277 return MCDisassembler::Fail;
4278 }
4279 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4280 }
4281
4282 if (Rt == 15) {
4283 switch (Inst.getOpcode()) {
4284 case ARM::t2LDRSHi12:
4285 return MCDisassembler::Fail;
4286 case ARM::t2LDRHi12:
4287 Inst.setOpcode(ARM::t2PLDWi12);
4288 break;
4289 case ARM::t2LDRSBi12:
4290 Inst.setOpcode(ARM::t2PLIi12);
4291 break;
4292 default:
4293 break;
4294 }
4295 }
4296
4297 switch (Inst.getOpcode()) {
4298 case ARM::t2PLDi12:
4299 break;
4300 case ARM::t2PLIi12:
4301 if (!hasV7Ops)
4302 return MCDisassembler::Fail;
4303 break;
4304 case ARM::t2PLDWi12:
4305 if (!hasV7Ops || !hasMP)
4306 return MCDisassembler::Fail;
4307 break;
4308 default:
4309 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4310 return MCDisassembler::Fail;
4311 }
4312
4313 if (!Check(S, DecodeT2AddrModeImm12(Inst, imm, Address, Decoder)))
4314 return MCDisassembler::Fail;
4315 return S;
4316}
4317
4318static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn, uint64_t Address,
4319 const MCDisassembler *Decoder) {
4320 DecodeStatus S = MCDisassembler::Success;
4321
4322 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4323 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4324 unsigned imm = fieldFromInstruction(Insn, 0, 8);
4325 imm |= (Rn << 9);
4326
4327 if (Rn == 15) {
4328 switch (Inst.getOpcode()) {
4329 case ARM::t2LDRT:
4330 Inst.setOpcode(ARM::t2LDRpci);
4331 break;
4332 case ARM::t2LDRBT:
4333 Inst.setOpcode(ARM::t2LDRBpci);
4334 break;
4335 case ARM::t2LDRHT:
4336 Inst.setOpcode(ARM::t2LDRHpci);
4337 break;
4338 case ARM::t2LDRSBT:
4339 Inst.setOpcode(ARM::t2LDRSBpci);
4340 break;
4341 case ARM::t2LDRSHT:
4342 Inst.setOpcode(ARM::t2LDRSHpci);
4343 break;
4344 default:
4345 return MCDisassembler::Fail;
4346 }
4347 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4348 }
4349
4350 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
4351 return MCDisassembler::Fail;
4352 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
4353 return MCDisassembler::Fail;
4354 return S;
4355}
4356
4357static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
4358 uint64_t Address,
4359 const MCDisassembler *Decoder) {
4360 DecodeStatus S = MCDisassembler::Success;
4361
4362 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4363 unsigned U = fieldFromInstruction(Insn, 23, 1);
4364 int imm = fieldFromInstruction(Insn, 0, 12);
4365
4366 const FeatureBitset &featureBits =
4367 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits();
4368
4369 bool hasV7Ops = featureBits[ARM::HasV7Ops];
4370
4371 if (Rt == 15) {
4372 switch (Inst.getOpcode()) {
4373 case ARM::t2LDRBpci:
4374 case ARM::t2LDRHpci:
4375 Inst.setOpcode(ARM::t2PLDpci);
4376 break;
4377 case ARM::t2LDRSBpci:
4378 Inst.setOpcode(ARM::t2PLIpci);
4379 break;
4380 case ARM::t2LDRSHpci:
4381 return MCDisassembler::Fail;
4382 default:
4383 break;
4384 }
4385 }
4386
4387 switch(Inst.getOpcode()) {
4388 case ARM::t2PLDpci:
4389 break;
4390 case ARM::t2PLIpci:
4391 if (!hasV7Ops)
4392 return MCDisassembler::Fail;
4393 break;
4394 default:
4395 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4396 return MCDisassembler::Fail;
4397 }
4398
4399 if (!U) {
4400 // Special case for #-0.
4401 if (imm == 0)
4402 imm = INT32_MIN;
4403 else
4404 imm = -imm;
4405 }
4406 Inst.addOperand(MCOperand::createImm(imm));
4407
4408 return S;
4409}
4410
4411static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val, uint64_t Address,
4412 const MCDisassembler *Decoder) {
4413 if (Val == 0)
4414 Inst.addOperand(MCOperand::createImm(INT32_MIN));
4415 else {
4416 int imm = Val & 0xFF;
4417
4418 if (!(Val & 0x100)) imm *= -1;
4419 Inst.addOperand(MCOperand::createImm(imm * 4));
4420 }
4421
4422 return MCDisassembler::Success;
4423}
4424
4425static DecodeStatus DecodeT2Imm7S4(MCInst &Inst, unsigned Val, uint64_t Address,
4426 const MCDisassembler *Decoder) {
4427 if (Val == 0)
4428 Inst.addOperand(MCOperand::createImm(INT32_MIN));
4429 else {
4430 int imm = Val & 0x7F;
4431
4432 if (!(Val & 0x80))
4433 imm *= -1;
4434 Inst.addOperand(MCOperand::createImm(imm * 4));
4435 }
4436
4437 return MCDisassembler::Success;
4438}
4439
4440static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
4441 uint64_t Address,
4442 const MCDisassembler *Decoder) {
4443 DecodeStatus S = MCDisassembler::Success;
4444
4445 unsigned Rn = fieldFromInstruction(Val, 9, 4);
4446 unsigned imm = fieldFromInstruction(Val, 0, 9);
4447
4448 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4449 return MCDisassembler::Fail;
4450 if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder)))
4451 return MCDisassembler::Fail;
4452
4453 return S;
4454}
4455
4456static DecodeStatus DecodeT2AddrModeImm7s4(MCInst &Inst, unsigned Val,
4457 uint64_t Address,
4458 const MCDisassembler *Decoder) {
4459 DecodeStatus S = MCDisassembler::Success;
4460
4461 unsigned Rn = fieldFromInstruction(Val, 8, 4);
4462 unsigned imm = fieldFromInstruction(Val, 0, 8);
4463
4464 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4465 return MCDisassembler::Fail;
4466 if (!Check(S, DecodeT2Imm7S4(Inst, imm, Address, Decoder)))
4467 return MCDisassembler::Fail;
4468
4469 return S;
4470}
4471
4472static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst, unsigned Val,
4473 uint64_t Address,
4474 const MCDisassembler *Decoder) {
4475 DecodeStatus S = MCDisassembler::Success;
4476
4477 unsigned Rn = fieldFromInstruction(Val, 8, 4);
4478 unsigned imm = fieldFromInstruction(Val, 0, 8);
4479
4480 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4481 return MCDisassembler::Fail;
4482
4483 Inst.addOperand(MCOperand::createImm(imm));
4484
4485 return S;
4486}
4487
4488static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val, uint64_t Address,
4489 const MCDisassembler *Decoder) {
4490 int imm = Val & 0xFF;
4491 if (Val == 0)
4492 imm = INT32_MIN;
4493 else if (!(Val & 0x100))
4494 imm *= -1;
4495 Inst.addOperand(MCOperand::createImm(imm));
4496
4497 return MCDisassembler::Success;
4498}
4499
4500template <int shift>
4501static DecodeStatus DecodeT2Imm7(MCInst &Inst, unsigned Val, uint64_t Address,
4502 const MCDisassembler *Decoder) {
4503 int imm = Val & 0x7F;
4504 if (Val == 0)
4505 imm = INT32_MIN;
4506 else if (!(Val & 0x80))
4507 imm *= -1;
4508 if (imm != INT32_MIN)
4509 imm *= (1U << shift);
4510 Inst.addOperand(MCOperand::createImm(imm));
4511
4512 return MCDisassembler::Success;
4513}
4514
4515static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
4516 uint64_t Address,
4517 const MCDisassembler *Decoder) {
4518 DecodeStatus S = MCDisassembler::Success;
4519
4520 unsigned Rn = fieldFromInstruction(Val, 9, 4);
4521 unsigned imm = fieldFromInstruction(Val, 0, 9);
4522
4523 // Thumb stores cannot use PC as dest register.
4524 switch (Inst.getOpcode()) {
4525 case ARM::t2STRT:
4526 case ARM::t2STRBT:
4527 case ARM::t2STRHT:
4528 case ARM::t2STRi8:
4529 case ARM::t2STRHi8:
4530 case ARM::t2STRBi8:
4531 if (Rn == 15)
4532 return MCDisassembler::Fail;
4533 break;
4534 default:
4535 break;
4536 }
4537
4538 // Some instructions always use an additive offset.
4539 switch (Inst.getOpcode()) {
4540 case ARM::t2LDRT:
4541 case ARM::t2LDRBT:
4542 case ARM::t2LDRHT:
4543 case ARM::t2LDRSBT:
4544 case ARM::t2LDRSHT:
4545 case ARM::t2STRT:
4546 case ARM::t2STRBT:
4547 case ARM::t2STRHT:
4548 imm |= 0x100;
4549 break;
4550 default:
4551 break;
4552 }
4553
4554 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4555 return MCDisassembler::Fail;
4556 if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder)))
4557 return MCDisassembler::Fail;
4558
4559 return S;
4560}
4561
4562template <int shift>
4563static DecodeStatus DecodeTAddrModeImm7(MCInst &Inst, unsigned Val,
4564 uint64_t Address,
4565 const MCDisassembler *Decoder) {
4566 DecodeStatus S = MCDisassembler::Success;
4567
4568 unsigned Rn = fieldFromInstruction(Val, 8, 3);
4569 unsigned imm = fieldFromInstruction(Val, 0, 8);
4570
4571 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
4572 return MCDisassembler::Fail;
4573 if (!Check(S, DecodeT2Imm7<shift>(Inst, imm, Address, Decoder)))
4574 return MCDisassembler::Fail;
4575
4576 return S;
4577}
4578
4579template <int shift, int WriteBack>
4580static DecodeStatus DecodeT2AddrModeImm7(MCInst &Inst, unsigned Val,
4581 uint64_t Address,
4582 const MCDisassembler *Decoder) {
4583 DecodeStatus S = MCDisassembler::Success;
4584
4585 unsigned Rn = fieldFromInstruction(Val, 8, 4);
4586 unsigned imm = fieldFromInstruction(Val, 0, 8);
4587 if (WriteBack) {
4588 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
4589 return MCDisassembler::Fail;
4590 } else if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4591 return MCDisassembler::Fail;
4592 if (!Check(S, DecodeT2Imm7<shift>(Inst, imm, Address, Decoder)))
4593 return MCDisassembler::Fail;
4594
4595 return S;
4596}
4597
4598static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Insn,
4599 uint64_t Address,
4600 const MCDisassembler *Decoder) {
4601 DecodeStatus S = MCDisassembler::Success;
4602
4603 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4604 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4605 unsigned addr = fieldFromInstruction(Insn, 0, 8);
4606 addr |= fieldFromInstruction(Insn, 9, 1) << 8;
4607 addr |= Rn << 9;
4608 unsigned load = fieldFromInstruction(Insn, 20, 1);
4609
4610 if (Rn == 15) {
4611 switch (Inst.getOpcode()) {
4612 case ARM::t2LDR_PRE:
4613 case ARM::t2LDR_POST:
4614 Inst.setOpcode(ARM::t2LDRpci);
4615 break;
4616 case ARM::t2LDRB_PRE:
4617 case ARM::t2LDRB_POST:
4618 Inst.setOpcode(ARM::t2LDRBpci);
4619 break;
4620 case ARM::t2LDRH_PRE:
4621 case ARM::t2LDRH_POST:
4622 Inst.setOpcode(ARM::t2LDRHpci);
4623 break;
4624 case ARM::t2LDRSB_PRE:
4625 case ARM::t2LDRSB_POST:
4626 if (Rt == 15)
4627 Inst.setOpcode(ARM::t2PLIpci);
4628 else
4629 Inst.setOpcode(ARM::t2LDRSBpci);
4630 break;
4631 case ARM::t2LDRSH_PRE:
4632 case ARM::t2LDRSH_POST:
4633 Inst.setOpcode(ARM::t2LDRSHpci);
4634 break;
4635 default:
4636 return MCDisassembler::Fail;
4637 }
4638 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
4639 }
4640
4641 if (!load) {
4642 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4643 return MCDisassembler::Fail;
4644 }
4645
4646 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4647 return MCDisassembler::Fail;
4648
4649 if (load) {
4650 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4651 return MCDisassembler::Fail;
4652 }
4653