1 //===-- ARMDisassembler.cpp - Disassembler for ARM/Thumb ISA --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #define DEBUG_TYPE "arm-disassembler"
12 #include "llvm/MC/MCDisassembler.h"
13 #include "MCTargetDesc/ARMAddressingModes.h"
14 #include "MCTargetDesc/ARMBaseInfo.h"
15 #include "MCTargetDesc/ARMMCExpr.h"
16 #include "llvm/MC/MCContext.h"
17 #include "llvm/MC/MCExpr.h"
18 #include "llvm/MC/MCFixedLenDisassembler.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/MC/MCInstrDesc.h"
21 #include "llvm/MC/MCSubtargetInfo.h"
22 #include "llvm/Support/Debug.h"
23 #include "llvm/Support/ErrorHandling.h"
24 #include "llvm/Support/LEB128.h"
25 #include "llvm/Support/MemoryObject.h"
26 #include "llvm/Support/TargetRegistry.h"
27 #include "llvm/Support/raw_ostream.h"
32 typedef MCDisassembler::DecodeStatus DecodeStatus;
35 // Handles the condition code status of instructions in IT blocks
39 // Returns the condition code for instruction in IT block
41 unsigned CC = ARMCC::AL;
47 // Advances the IT block state to the next T or E
48 void advanceITState() {
52 // Returns true if the current instruction is in an IT block
53 bool instrInITBlock() {
54 return !ITStates.empty();
57 // Returns true if current instruction is the last instruction in an IT block
58 bool instrLastInITBlock() {
59 return ITStates.size() == 1;
62 // Called when decoding an IT instruction. Sets the IT state for the following
63 // instructions that for the IT block. Firstcond and Mask correspond to the
64 // fields in the IT instruction encoding.
65 void setITState(char Firstcond, char Mask) {
66 // (3 - the number of trailing zeros) is the number of then / else.
67 unsigned CondBit0 = Firstcond & 1;
68 unsigned NumTZ = countTrailingZeros<uint8_t>(Mask);
69 unsigned char CCBits = static_cast<unsigned char>(Firstcond & 0xf);
70 assert(NumTZ <= 3 && "Invalid IT mask!");
71 // push condition codes onto the stack the correct order for the pops
72 for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) {
73 bool T = ((Mask >> Pos) & 1) == CondBit0;
75 ITStates.push_back(CCBits);
77 ITStates.push_back(CCBits ^ 1);
79 ITStates.push_back(CCBits);
83 std::vector<unsigned char> ITStates;
88 /// ARMDisassembler - ARM disassembler for all ARM platforms.
89 class ARMDisassembler : public MCDisassembler {
91 /// Constructor - Initializes the disassembler.
93 ARMDisassembler(const MCSubtargetInfo &STI) :
100 /// getInstruction - See MCDisassembler.
101 DecodeStatus getInstruction(MCInst &instr,
103 const MemoryObject ®ion,
105 raw_ostream &vStream,
106 raw_ostream &cStream) const;
109 /// ThumbDisassembler - Thumb disassembler for all Thumb platforms.
110 class ThumbDisassembler : public MCDisassembler {
112 /// Constructor - Initializes the disassembler.
114 ThumbDisassembler(const MCSubtargetInfo &STI) :
115 MCDisassembler(STI) {
118 ~ThumbDisassembler() {
121 /// getInstruction - See MCDisassembler.
122 DecodeStatus getInstruction(MCInst &instr,
124 const MemoryObject ®ion,
126 raw_ostream &vStream,
127 raw_ostream &cStream) const;
130 mutable ITStatus ITBlock;
131 DecodeStatus AddThumbPredicate(MCInst&) const;
132 void UpdateThumbVFPPredicate(MCInst&) const;
136 static bool Check(DecodeStatus &Out, DecodeStatus In) {
138 case MCDisassembler::Success:
139 // Out stays the same.
141 case MCDisassembler::SoftFail:
144 case MCDisassembler::Fail:
148 llvm_unreachable("Invalid DecodeStatus!");
152 // Forward declare these because the autogenerated code will reference them.
153 // Definitions are further down.
154 static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
155 uint64_t Address, const void *Decoder);
156 static DecodeStatus DecodeGPRnopcRegisterClass(MCInst &Inst,
157 unsigned RegNo, uint64_t Address,
158 const void *Decoder);
159 static DecodeStatus DecodeGPRwithAPSRRegisterClass(MCInst &Inst,
160 unsigned RegNo, uint64_t Address,
161 const void *Decoder);
162 static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
163 uint64_t Address, const void *Decoder);
164 static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
165 uint64_t Address, const void *Decoder);
166 static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
167 uint64_t Address, const void *Decoder);
168 static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
169 uint64_t Address, const void *Decoder);
170 static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
171 uint64_t Address, const void *Decoder);
172 static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
173 uint64_t Address, const void *Decoder);
174 static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
175 uint64_t Address, const void *Decoder);
176 static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst &Inst,
179 const void *Decoder);
180 static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
181 uint64_t Address, const void *Decoder);
182 static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
183 uint64_t Address, const void *Decoder);
184 static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst &Inst,
185 unsigned RegNo, uint64_t Address,
186 const void *Decoder);
188 static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
189 uint64_t Address, const void *Decoder);
190 static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
191 uint64_t Address, const void *Decoder);
192 static DecodeStatus DecodeSOImmOperand(MCInst &Inst, unsigned Val,
193 uint64_t Address, const void *Decoder);
194 static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
195 uint64_t Address, const void *Decoder);
196 static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
197 uint64_t Address, const void *Decoder);
198 static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
199 uint64_t Address, const void *Decoder);
201 static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Insn,
202 uint64_t Address, const void *Decoder);
203 static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
204 uint64_t Address, const void *Decoder);
205 static DecodeStatus DecodeAddrMode2IdxInstruction(MCInst &Inst,
208 const void *Decoder);
209 static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Insn,
210 uint64_t Address, const void *Decoder);
211 static DecodeStatus DecodeAddrMode3Instruction(MCInst &Inst,unsigned Insn,
212 uint64_t Address, const void *Decoder);
213 static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Insn,
214 uint64_t Address, const void *Decoder);
215 static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Insn,
216 uint64_t Address, const void *Decoder);
218 static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst & Inst,
221 const void *Decoder);
222 static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
223 uint64_t Address, const void *Decoder);
224 static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
225 uint64_t Address, const void *Decoder);
226 static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
227 uint64_t Address, const void *Decoder);
228 static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
229 uint64_t Address, const void *Decoder);
230 static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
231 uint64_t Address, const void *Decoder);
232 static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
233 uint64_t Address, const void *Decoder);
234 static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
235 uint64_t Address, const void *Decoder);
236 static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
237 uint64_t Address, const void *Decoder);
238 static DecodeStatus DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
239 uint64_t Address, const void *Decoder);
240 static DecodeStatus DecodeBranchImmInstruction(MCInst &Inst,unsigned Insn,
241 uint64_t Address, const void *Decoder);
242 static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
243 uint64_t Address, const void *Decoder);
244 static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Val,
245 uint64_t Address, const void *Decoder);
246 static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Val,
247 uint64_t Address, const void *Decoder);
248 static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Val,
249 uint64_t Address, const void *Decoder);
250 static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Val,
251 uint64_t Address, const void *Decoder);
252 static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Val,
253 uint64_t Address, const void *Decoder);
254 static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Val,
255 uint64_t Address, const void *Decoder);
256 static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Val,
257 uint64_t Address, const void *Decoder);
258 static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Val,
259 uint64_t Address, const void *Decoder);
260 static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Val,
261 uint64_t Address, const void *Decoder);
262 static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Val,
263 uint64_t Address, const void *Decoder);
264 static DecodeStatus DecodeNEONModImmInstruction(MCInst &Inst,unsigned Val,
265 uint64_t Address, const void *Decoder);
266 static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Val,
267 uint64_t Address, const void *Decoder);
268 static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
269 uint64_t Address, const void *Decoder);
270 static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
271 uint64_t Address, const void *Decoder);
272 static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
273 uint64_t Address, const void *Decoder);
274 static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
275 uint64_t Address, const void *Decoder);
276 static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
277 uint64_t Address, const void *Decoder);
278 static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn,
279 uint64_t Address, const void *Decoder);
280 static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Insn,
281 uint64_t Address, const void *Decoder);
282 static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Insn,
283 uint64_t Address, const void *Decoder);
284 static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Insn,
285 uint64_t Address, const void *Decoder);
286 static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Insn,
287 uint64_t Address, const void *Decoder);
288 static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn,
289 uint64_t Address, const void *Decoder);
290 static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn,
291 uint64_t Address, const void *Decoder);
292 static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn,
293 uint64_t Address, const void *Decoder);
294 static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn,
295 uint64_t Address, const void *Decoder);
296 static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn,
297 uint64_t Address, const void *Decoder);
298 static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn,
299 uint64_t Address, const void *Decoder);
300 static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn,
301 uint64_t Address, const void *Decoder);
302 static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn,
303 uint64_t Address, const void *Decoder);
304 static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn,
305 uint64_t Address, const void *Decoder);
306 static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn,
307 uint64_t Address, const void *Decoder);
308 static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn,
309 uint64_t Address, const void *Decoder);
310 static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn,
311 uint64_t Address, const void *Decoder);
312 static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn,
313 uint64_t Address, const void *Decoder);
314 static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn,
315 uint64_t Address, const void *Decoder);
316 static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn,
317 uint64_t Address, const void *Decoder);
318 static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn,
319 uint64_t Address, const void *Decoder);
320 static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn,
321 uint64_t Address, const void *Decoder);
322 static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn,
323 uint64_t Address, const void *Decoder);
324 static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn,
325 uint64_t Address, const void *Decoder);
326 static DecodeStatus DecodeImm0_4(MCInst &Inst, unsigned Insn, uint64_t Address,
327 const void *Decoder);
330 static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
331 uint64_t Address, const void *Decoder);
332 static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
333 uint64_t Address, const void *Decoder);
334 static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
335 uint64_t Address, const void *Decoder);
336 static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
337 uint64_t Address, const void *Decoder);
338 static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
339 uint64_t Address, const void *Decoder);
340 static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
341 uint64_t Address, const void *Decoder);
342 static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
343 uint64_t Address, const void *Decoder);
344 static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
345 uint64_t Address, const void *Decoder);
346 static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
347 uint64_t Address, const void *Decoder);
348 static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Val,
349 uint64_t Address, const void *Decoder);
350 static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
351 uint64_t Address, const void* Decoder);
352 static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
353 uint64_t Address, const void* Decoder);
354 static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn,
355 uint64_t Address, const void* Decoder);
356 static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
357 uint64_t Address, const void* Decoder);
358 static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val,
359 uint64_t Address, const void *Decoder);
360 static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
361 uint64_t Address, const void *Decoder);
362 static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val,
363 uint64_t Address, const void *Decoder);
364 static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val,
365 uint64_t Address, const void *Decoder);
366 static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
367 uint64_t Address, const void *Decoder);
368 static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Val,
369 uint64_t Address, const void *Decoder);
370 static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
371 uint64_t Address, const void *Decoder);
372 static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn,
373 uint64_t Address, const void *Decoder);
374 static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
375 uint64_t Address, const void *Decoder);
376 static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Insn,
377 uint64_t Address, const void *Decoder);
378 static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
379 uint64_t Address, const void *Decoder);
380 static DecodeStatus DecodeThumbTableBranch(MCInst &Inst, unsigned Val,
381 uint64_t Address, const void *Decoder);
382 static DecodeStatus DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Val,
383 uint64_t Address, const void *Decoder);
384 static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val,
385 uint64_t Address, const void *Decoder);
386 static DecodeStatus DecodeThumbBCCTargetOperand(MCInst &Inst,unsigned Val,
387 uint64_t Address, const void *Decoder);
388 static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val,
389 uint64_t Address, const void *Decoder);
390 static DecodeStatus DecodeIT(MCInst &Inst, unsigned Val,
391 uint64_t Address, const void *Decoder);
392 static DecodeStatus DecodeT2LDRDPreInstruction(MCInst &Inst,unsigned Insn,
393 uint64_t Address, const void *Decoder);
394 static DecodeStatus DecodeT2STRDPreInstruction(MCInst &Inst,unsigned Insn,
395 uint64_t Address, const void *Decoder);
396 static DecodeStatus DecodeT2Adr(MCInst &Inst, unsigned Val,
397 uint64_t Address, const void *Decoder);
398 static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Val,
399 uint64_t Address, const void *Decoder);
400 static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, unsigned Val,
401 uint64_t Address, const void *Decoder);
403 static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val,
404 uint64_t Address, const void *Decoder);
405 static DecodeStatus DecodeMRRC2(llvm::MCInst &Inst, unsigned Val,
406 uint64_t Address, const void *Decoder);
407 #include "ARMGenDisassemblerTables.inc"
409 static MCDisassembler *createARMDisassembler(const Target &T, const MCSubtargetInfo &STI) {
410 return new ARMDisassembler(STI);
413 static MCDisassembler *createThumbDisassembler(const Target &T, const MCSubtargetInfo &STI) {
414 return new ThumbDisassembler(STI);
417 DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
418 const MemoryObject &Region,
421 raw_ostream &cs) const {
426 assert(!(STI.getFeatureBits() & ARM::ModeThumb) &&
427 "Asked to disassemble an ARM instruction but Subtarget is in Thumb mode!");
429 // We want to read exactly 4 bytes of data.
430 if (Region.readBytes(Address, 4, bytes) == -1) {
432 return MCDisassembler::Fail;
435 // Encoded as a small-endian 32-bit word in the stream.
436 uint32_t insn = (bytes[3] << 24) |
441 // Calling the auto-generated decoder function.
442 DecodeStatus result = decodeInstruction(DecoderTableARM32, MI, insn,
444 if (result != MCDisassembler::Fail) {
449 // VFP and NEON instructions, similarly, are shared between ARM
452 result = decodeInstruction(DecoderTableVFP32, MI, insn, Address, this, STI);
453 if (result != MCDisassembler::Fail) {
459 result = decodeInstruction(DecoderTableNEONData32, MI, insn, Address,
461 if (result != MCDisassembler::Fail) {
463 // Add a fake predicate operand, because we share these instruction
464 // definitions with Thumb2 where these instructions are predicable.
465 if (!DecodePredicateOperand(MI, 0xE, Address, this))
466 return MCDisassembler::Fail;
471 result = decodeInstruction(DecoderTableNEONLoadStore32, MI, insn, Address,
473 if (result != MCDisassembler::Fail) {
475 // Add a fake predicate operand, because we share these instruction
476 // definitions with Thumb2 where these instructions are predicable.
477 if (!DecodePredicateOperand(MI, 0xE, Address, this))
478 return MCDisassembler::Fail;
483 result = decodeInstruction(DecoderTableNEONDup32, MI, insn, Address,
485 if (result != MCDisassembler::Fail) {
487 // Add a fake predicate operand, because we share these instruction
488 // definitions with Thumb2 where these instructions are predicable.
489 if (!DecodePredicateOperand(MI, 0xE, Address, this))
490 return MCDisassembler::Fail;
497 return MCDisassembler::Fail;
501 extern const MCInstrDesc ARMInsts[];
504 /// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the
505 /// immediate Value in the MCInst. The immediate Value has had any PC
506 /// adjustment made by the caller. If the instruction is a branch instruction
507 /// then isBranch is true, else false. If the getOpInfo() function was set as
508 /// part of the setupForSymbolicDisassembly() call then that function is called
509 /// to get any symbolic information at the Address for this instruction. If
510 /// that returns non-zero then the symbolic information it returns is used to
511 /// create an MCExpr and that is added as an operand to the MCInst. If
512 /// getOpInfo() returns zero and isBranch is true then a symbol look up for
513 /// Value is done and if a symbol is found an MCExpr is created with that, else
514 /// an MCExpr with Value is created. This function returns true if it adds an
515 /// operand to the MCInst and false otherwise.
516 static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value,
517 bool isBranch, uint64_t InstSize,
518 MCInst &MI, const void *Decoder) {
519 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
520 // FIXME: Does it make sense for value to be negative?
521 return Dis->tryAddingSymbolicOperand(MI, (uint32_t)Value, Address, isBranch,
522 /* Offset */ 0, InstSize);
525 /// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being
526 /// referenced by a load instruction with the base register that is the Pc.
527 /// These can often be values in a literal pool near the Address of the
528 /// instruction. The Address of the instruction and its immediate Value are
529 /// used as a possible literal pool entry. The SymbolLookUp call back will
530 /// return the name of a symbol referenced by the literal pool's entry if
531 /// the referenced address is that of a symbol. Or it will return a pointer to
532 /// a literal 'C' string if the referenced address of the literal pool's entry
533 /// is an address into a section with 'C' string literals.
534 static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value,
535 const void *Decoder) {
536 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
537 Dis->tryAddingPcLoadReferenceComment(Value, Address);
540 // Thumb1 instructions don't have explicit S bits. Rather, they
541 // implicitly set CPSR. Since it's not represented in the encoding, the
542 // auto-generated decoder won't inject the CPSR operand. We need to fix
543 // that as a post-pass.
544 static void AddThumb1SBit(MCInst &MI, bool InITBlock) {
545 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
546 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
547 MCInst::iterator I = MI.begin();
548 for (unsigned i = 0; i < NumOps; ++i, ++I) {
549 if (I == MI.end()) break;
550 if (OpInfo[i].isOptionalDef() && OpInfo[i].RegClass == ARM::CCRRegClassID) {
551 if (i > 0 && OpInfo[i-1].isPredicate()) continue;
552 MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR));
557 MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR));
560 // Most Thumb instructions don't have explicit predicates in the
561 // encoding, but rather get their predicates from IT context. We need
562 // to fix up the predicate operands using this context information as a
564 MCDisassembler::DecodeStatus
565 ThumbDisassembler::AddThumbPredicate(MCInst &MI) const {
566 MCDisassembler::DecodeStatus S = Success;
568 // A few instructions actually have predicates encoded in them. Don't
569 // try to overwrite it if we're seeing one of those.
570 switch (MI.getOpcode()) {
581 // Some instructions (mostly conditional branches) are not
582 // allowed in IT blocks.
583 if (ITBlock.instrInITBlock())
592 // Some instructions (mostly unconditional branches) can
593 // only appears at the end of, or outside of, an IT.
594 if (ITBlock.instrInITBlock() && !ITBlock.instrLastInITBlock())
601 // If we're in an IT block, base the predicate on that. Otherwise,
602 // assume a predicate of AL.
604 CC = ITBlock.getITCC();
607 if (ITBlock.instrInITBlock())
608 ITBlock.advanceITState();
610 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
611 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
612 MCInst::iterator I = MI.begin();
613 for (unsigned i = 0; i < NumOps; ++i, ++I) {
614 if (I == MI.end()) break;
615 if (OpInfo[i].isPredicate()) {
616 I = MI.insert(I, MCOperand::CreateImm(CC));
619 MI.insert(I, MCOperand::CreateReg(0));
621 MI.insert(I, MCOperand::CreateReg(ARM::CPSR));
626 I = MI.insert(I, MCOperand::CreateImm(CC));
629 MI.insert(I, MCOperand::CreateReg(0));
631 MI.insert(I, MCOperand::CreateReg(ARM::CPSR));
636 // Thumb VFP instructions are a special case. Because we share their
637 // encodings between ARM and Thumb modes, and they are predicable in ARM
638 // mode, the auto-generated decoder will give them an (incorrect)
639 // predicate operand. We need to rewrite these operands based on the IT
640 // context as a post-pass.
641 void ThumbDisassembler::UpdateThumbVFPPredicate(MCInst &MI) const {
643 CC = ITBlock.getITCC();
644 if (ITBlock.instrInITBlock())
645 ITBlock.advanceITState();
647 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
648 MCInst::iterator I = MI.begin();
649 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
650 for (unsigned i = 0; i < NumOps; ++i, ++I) {
651 if (OpInfo[i].isPredicate() ) {
657 I->setReg(ARM::CPSR);
663 DecodeStatus ThumbDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
664 const MemoryObject &Region,
667 raw_ostream &cs) const {
672 assert((STI.getFeatureBits() & ARM::ModeThumb) &&
673 "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!");
675 // We want to read exactly 2 bytes of data.
676 if (Region.readBytes(Address, 2, bytes) == -1) {
678 return MCDisassembler::Fail;
681 uint16_t insn16 = (bytes[1] << 8) | bytes[0];
682 DecodeStatus result = decodeInstruction(DecoderTableThumb16, MI, insn16,
684 if (result != MCDisassembler::Fail) {
686 Check(result, AddThumbPredicate(MI));
691 result = decodeInstruction(DecoderTableThumbSBit16, MI, insn16,
695 bool InITBlock = ITBlock.instrInITBlock();
696 Check(result, AddThumbPredicate(MI));
697 AddThumb1SBit(MI, InITBlock);
702 result = decodeInstruction(DecoderTableThumb216, MI, insn16,
704 if (result != MCDisassembler::Fail) {
707 // Nested IT blocks are UNPREDICTABLE. Must be checked before we add
708 // the Thumb predicate.
709 if (MI.getOpcode() == ARM::t2IT && ITBlock.instrInITBlock())
710 result = MCDisassembler::SoftFail;
712 Check(result, AddThumbPredicate(MI));
714 // If we find an IT instruction, we need to parse its condition
715 // code and mask operands so that we can apply them correctly
716 // to the subsequent instructions.
717 if (MI.getOpcode() == ARM::t2IT) {
719 unsigned Firstcond = MI.getOperand(0).getImm();
720 unsigned Mask = MI.getOperand(1).getImm();
721 ITBlock.setITState(Firstcond, Mask);
727 // We want to read exactly 4 bytes of data.
728 if (Region.readBytes(Address, 4, bytes) == -1) {
730 return MCDisassembler::Fail;
733 uint32_t insn32 = (bytes[3] << 8) |
738 result = decodeInstruction(DecoderTableThumb32, MI, insn32, Address,
740 if (result != MCDisassembler::Fail) {
742 bool InITBlock = ITBlock.instrInITBlock();
743 Check(result, AddThumbPredicate(MI));
744 AddThumb1SBit(MI, InITBlock);
749 result = decodeInstruction(DecoderTableThumb232, MI, insn32, Address,
751 if (result != MCDisassembler::Fail) {
753 Check(result, AddThumbPredicate(MI));
758 result = decodeInstruction(DecoderTableVFP32, MI, insn32, Address, this, STI);
759 if (result != MCDisassembler::Fail) {
761 UpdateThumbVFPPredicate(MI);
766 result = decodeInstruction(DecoderTableNEONDup32, MI, insn32, Address,
768 if (result != MCDisassembler::Fail) {
770 Check(result, AddThumbPredicate(MI));
774 if (fieldFromInstruction(insn32, 24, 8) == 0xF9) {
776 uint32_t NEONLdStInsn = insn32;
777 NEONLdStInsn &= 0xF0FFFFFF;
778 NEONLdStInsn |= 0x04000000;
779 result = decodeInstruction(DecoderTableNEONLoadStore32, MI, NEONLdStInsn,
781 if (result != MCDisassembler::Fail) {
783 Check(result, AddThumbPredicate(MI));
788 if (fieldFromInstruction(insn32, 24, 4) == 0xF) {
790 uint32_t NEONDataInsn = insn32;
791 NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24
792 NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
793 NEONDataInsn |= 0x12000000; // Set bits 28 and 25
794 result = decodeInstruction(DecoderTableNEONData32, MI, NEONDataInsn,
796 if (result != MCDisassembler::Fail) {
798 Check(result, AddThumbPredicate(MI));
804 return MCDisassembler::Fail;
808 extern "C" void LLVMInitializeARMDisassembler() {
809 TargetRegistry::RegisterMCDisassembler(TheARMTarget,
810 createARMDisassembler);
811 TargetRegistry::RegisterMCDisassembler(TheThumbTarget,
812 createThumbDisassembler);
815 static const uint16_t GPRDecoderTable[] = {
816 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
817 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
818 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
819 ARM::R12, ARM::SP, ARM::LR, ARM::PC
822 static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
823 uint64_t Address, const void *Decoder) {
825 return MCDisassembler::Fail;
827 unsigned Register = GPRDecoderTable[RegNo];
828 Inst.addOperand(MCOperand::CreateReg(Register));
829 return MCDisassembler::Success;
833 DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo,
834 uint64_t Address, const void *Decoder) {
835 DecodeStatus S = MCDisassembler::Success;
838 S = MCDisassembler::SoftFail;
840 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
846 DecodeGPRwithAPSRRegisterClass(MCInst &Inst, unsigned RegNo,
847 uint64_t Address, const void *Decoder) {
848 DecodeStatus S = MCDisassembler::Success;
852 Inst.addOperand(MCOperand::CreateReg(ARM::APSR_NZCV));
853 return MCDisassembler::Success;
856 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
860 static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
861 uint64_t Address, const void *Decoder) {
863 return MCDisassembler::Fail;
864 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder);
867 static const uint16_t GPRPairDecoderTable[] = {
868 ARM::R0_R1, ARM::R2_R3, ARM::R4_R5, ARM::R6_R7,
869 ARM::R8_R9, ARM::R10_R11, ARM::R12_SP
872 static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
873 uint64_t Address, const void *Decoder) {
874 DecodeStatus S = MCDisassembler::Success;
877 return MCDisassembler::Fail;
879 if ((RegNo & 1) || RegNo == 0xe)
880 S = MCDisassembler::SoftFail;
882 unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
883 Inst.addOperand(MCOperand::CreateReg(RegisterPair));
887 static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
888 uint64_t Address, const void *Decoder) {
889 unsigned Register = 0;
910 return MCDisassembler::Fail;
913 Inst.addOperand(MCOperand::CreateReg(Register));
914 return MCDisassembler::Success;
917 static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
918 uint64_t Address, const void *Decoder) {
919 DecodeStatus S = MCDisassembler::Success;
920 if (RegNo == 13 || RegNo == 15)
921 S = MCDisassembler::SoftFail;
922 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
926 static const uint16_t SPRDecoderTable[] = {
927 ARM::S0, ARM::S1, ARM::S2, ARM::S3,
928 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
929 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
930 ARM::S12, ARM::S13, ARM::S14, ARM::S15,
931 ARM::S16, ARM::S17, ARM::S18, ARM::S19,
932 ARM::S20, ARM::S21, ARM::S22, ARM::S23,
933 ARM::S24, ARM::S25, ARM::S26, ARM::S27,
934 ARM::S28, ARM::S29, ARM::S30, ARM::S31
937 static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
938 uint64_t Address, const void *Decoder) {
940 return MCDisassembler::Fail;
942 unsigned Register = SPRDecoderTable[RegNo];
943 Inst.addOperand(MCOperand::CreateReg(Register));
944 return MCDisassembler::Success;
947 static const uint16_t DPRDecoderTable[] = {
948 ARM::D0, ARM::D1, ARM::D2, ARM::D3,
949 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
950 ARM::D8, ARM::D9, ARM::D10, ARM::D11,
951 ARM::D12, ARM::D13, ARM::D14, ARM::D15,
952 ARM::D16, ARM::D17, ARM::D18, ARM::D19,
953 ARM::D20, ARM::D21, ARM::D22, ARM::D23,
954 ARM::D24, ARM::D25, ARM::D26, ARM::D27,
955 ARM::D28, ARM::D29, ARM::D30, ARM::D31
958 static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
959 uint64_t Address, const void *Decoder) {
961 return MCDisassembler::Fail;
963 unsigned Register = DPRDecoderTable[RegNo];
964 Inst.addOperand(MCOperand::CreateReg(Register));
965 return MCDisassembler::Success;
968 static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
969 uint64_t Address, const void *Decoder) {
971 return MCDisassembler::Fail;
972 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
976 DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo,
977 uint64_t Address, const void *Decoder) {
979 return MCDisassembler::Fail;
980 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
983 static const uint16_t QPRDecoderTable[] = {
984 ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3,
985 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7,
986 ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11,
987 ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15
991 static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
992 uint64_t Address, const void *Decoder) {
993 if (RegNo > 31 || (RegNo & 1) != 0)
994 return MCDisassembler::Fail;
997 unsigned Register = QPRDecoderTable[RegNo];
998 Inst.addOperand(MCOperand::CreateReg(Register));
999 return MCDisassembler::Success;
1002 static const uint16_t DPairDecoderTable[] = {
1003 ARM::Q0, ARM::D1_D2, ARM::Q1, ARM::D3_D4, ARM::Q2, ARM::D5_D6,
1004 ARM::Q3, ARM::D7_D8, ARM::Q4, ARM::D9_D10, ARM::Q5, ARM::D11_D12,
1005 ARM::Q6, ARM::D13_D14, ARM::Q7, ARM::D15_D16, ARM::Q8, ARM::D17_D18,
1006 ARM::Q9, ARM::D19_D20, ARM::Q10, ARM::D21_D22, ARM::Q11, ARM::D23_D24,
1007 ARM::Q12, ARM::D25_D26, ARM::Q13, ARM::D27_D28, ARM::Q14, ARM::D29_D30,
1011 static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
1012 uint64_t Address, const void *Decoder) {
1014 return MCDisassembler::Fail;
1016 unsigned Register = DPairDecoderTable[RegNo];
1017 Inst.addOperand(MCOperand::CreateReg(Register));
1018 return MCDisassembler::Success;
1021 static const uint16_t DPairSpacedDecoderTable[] = {
1022 ARM::D0_D2, ARM::D1_D3, ARM::D2_D4, ARM::D3_D5,
1023 ARM::D4_D6, ARM::D5_D7, ARM::D6_D8, ARM::D7_D9,
1024 ARM::D8_D10, ARM::D9_D11, ARM::D10_D12, ARM::D11_D13,
1025 ARM::D12_D14, ARM::D13_D15, ARM::D14_D16, ARM::D15_D17,
1026 ARM::D16_D18, ARM::D17_D19, ARM::D18_D20, ARM::D19_D21,
1027 ARM::D20_D22, ARM::D21_D23, ARM::D22_D24, ARM::D23_D25,
1028 ARM::D24_D26, ARM::D25_D27, ARM::D26_D28, ARM::D27_D29,
1029 ARM::D28_D30, ARM::D29_D31
1032 static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst &Inst,
1035 const void *Decoder) {
1037 return MCDisassembler::Fail;
1039 unsigned Register = DPairSpacedDecoderTable[RegNo];
1040 Inst.addOperand(MCOperand::CreateReg(Register));
1041 return MCDisassembler::Success;
1044 static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
1045 uint64_t Address, const void *Decoder) {
1046 if (Val == 0xF) return MCDisassembler::Fail;
1047 // AL predicate is not allowed on Thumb1 branches.
1048 if (Inst.getOpcode() == ARM::tBcc && Val == 0xE)
1049 return MCDisassembler::Fail;
1050 Inst.addOperand(MCOperand::CreateImm(Val));
1051 if (Val == ARMCC::AL) {
1052 Inst.addOperand(MCOperand::CreateReg(0));
1054 Inst.addOperand(MCOperand::CreateReg(ARM::CPSR));
1055 return MCDisassembler::Success;
1058 static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
1059 uint64_t Address, const void *Decoder) {
1061 Inst.addOperand(MCOperand::CreateReg(ARM::CPSR));
1063 Inst.addOperand(MCOperand::CreateReg(0));
1064 return MCDisassembler::Success;
1067 static DecodeStatus DecodeSOImmOperand(MCInst &Inst, unsigned Val,
1068 uint64_t Address, const void *Decoder) {
1069 uint32_t imm = Val & 0xFF;
1070 uint32_t rot = (Val & 0xF00) >> 7;
1071 uint32_t rot_imm = (imm >> rot) | (imm << ((32-rot) & 0x1F));
1072 Inst.addOperand(MCOperand::CreateImm(rot_imm));
1073 return MCDisassembler::Success;
1076 static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Val,
1077 uint64_t Address, const void *Decoder) {
1078 DecodeStatus S = MCDisassembler::Success;
1080 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1081 unsigned type = fieldFromInstruction(Val, 5, 2);
1082 unsigned imm = fieldFromInstruction(Val, 7, 5);
1084 // Register-immediate
1085 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
1086 return MCDisassembler::Fail;
1088 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1091 Shift = ARM_AM::lsl;
1094 Shift = ARM_AM::lsr;
1097 Shift = ARM_AM::asr;
1100 Shift = ARM_AM::ror;
1104 if (Shift == ARM_AM::ror && imm == 0)
1105 Shift = ARM_AM::rrx;
1107 unsigned Op = Shift | (imm << 3);
1108 Inst.addOperand(MCOperand::CreateImm(Op));
1113 static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Val,
1114 uint64_t Address, const void *Decoder) {
1115 DecodeStatus S = MCDisassembler::Success;
1117 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1118 unsigned type = fieldFromInstruction(Val, 5, 2);
1119 unsigned Rs = fieldFromInstruction(Val, 8, 4);
1121 // Register-register
1122 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1123 return MCDisassembler::Fail;
1124 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder)))
1125 return MCDisassembler::Fail;
1127 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1130 Shift = ARM_AM::lsl;
1133 Shift = ARM_AM::lsr;
1136 Shift = ARM_AM::asr;
1139 Shift = ARM_AM::ror;
1143 Inst.addOperand(MCOperand::CreateImm(Shift));
1148 static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
1149 uint64_t Address, const void *Decoder) {
1150 DecodeStatus S = MCDisassembler::Success;
1152 bool writebackLoad = false;
1153 unsigned writebackReg = 0;
1154 switch (Inst.getOpcode()) {
1157 case ARM::LDMIA_UPD:
1158 case ARM::LDMDB_UPD:
1159 case ARM::LDMIB_UPD:
1160 case ARM::LDMDA_UPD:
1161 case ARM::t2LDMIA_UPD:
1162 case ARM::t2LDMDB_UPD:
1163 writebackLoad = true;
1164 writebackReg = Inst.getOperand(0).getReg();
1168 // Empty register lists are not allowed.
1169 if (Val == 0) return MCDisassembler::Fail;
1170 for (unsigned i = 0; i < 16; ++i) {
1171 if (Val & (1 << i)) {
1172 if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder)))
1173 return MCDisassembler::Fail;
1174 // Writeback not allowed if Rn is in the target list.
1175 if (writebackLoad && writebackReg == Inst.end()[-1].getReg())
1176 Check(S, MCDisassembler::SoftFail);
1183 static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
1184 uint64_t Address, const void *Decoder) {
1185 DecodeStatus S = MCDisassembler::Success;
1187 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1188 unsigned regs = fieldFromInstruction(Val, 0, 8);
1190 // In case of unpredictable encoding, tweak the operands.
1191 if (regs == 0 || (Vd + regs) > 32) {
1192 regs = Vd + regs > 32 ? 32 - Vd : regs;
1193 regs = std::max( 1u, regs);
1194 S = MCDisassembler::SoftFail;
1197 if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder)))
1198 return MCDisassembler::Fail;
1199 for (unsigned i = 0; i < (regs - 1); ++i) {
1200 if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1201 return MCDisassembler::Fail;
1207 static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
1208 uint64_t Address, const void *Decoder) {
1209 DecodeStatus S = MCDisassembler::Success;
1211 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1212 unsigned regs = fieldFromInstruction(Val, 1, 7);
1214 // In case of unpredictable encoding, tweak the operands.
1215 if (regs == 0 || regs > 16 || (Vd + regs) > 32) {
1216 regs = Vd + regs > 32 ? 32 - Vd : regs;
1217 regs = std::max( 1u, regs);
1218 regs = std::min(16u, regs);
1219 S = MCDisassembler::SoftFail;
1222 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
1223 return MCDisassembler::Fail;
1224 for (unsigned i = 0; i < (regs - 1); ++i) {
1225 if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1226 return MCDisassembler::Fail;
1232 static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Val,
1233 uint64_t Address, const void *Decoder) {
1234 // This operand encodes a mask of contiguous zeros between a specified MSB
1235 // and LSB. To decode it, we create the mask of all bits MSB-and-lower,
1236 // the mask of all bits LSB-and-lower, and then xor them to create
1237 // the mask of that's all ones on [msb, lsb]. Finally we not it to
1238 // create the final mask.
1239 unsigned msb = fieldFromInstruction(Val, 5, 5);
1240 unsigned lsb = fieldFromInstruction(Val, 0, 5);
1242 DecodeStatus S = MCDisassembler::Success;
1244 Check(S, MCDisassembler::SoftFail);
1245 // The check above will cause the warning for the "potentially undefined
1246 // instruction encoding" but we can't build a bad MCOperand value here
1247 // with a lsb > msb or else printing the MCInst will cause a crash.
1251 uint32_t msb_mask = 0xFFFFFFFF;
1252 if (msb != 31) msb_mask = (1U << (msb+1)) - 1;
1253 uint32_t lsb_mask = (1U << lsb) - 1;
1255 Inst.addOperand(MCOperand::CreateImm(~(msb_mask ^ lsb_mask)));
1259 static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
1260 uint64_t Address, const void *Decoder) {
1261 DecodeStatus S = MCDisassembler::Success;
1263 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1264 unsigned CRd = fieldFromInstruction(Insn, 12, 4);
1265 unsigned coproc = fieldFromInstruction(Insn, 8, 4);
1266 unsigned imm = fieldFromInstruction(Insn, 0, 8);
1267 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1268 unsigned U = fieldFromInstruction(Insn, 23, 1);
1270 switch (Inst.getOpcode()) {
1271 case ARM::LDC_OFFSET:
1274 case ARM::LDC_OPTION:
1275 case ARM::LDCL_OFFSET:
1277 case ARM::LDCL_POST:
1278 case ARM::LDCL_OPTION:
1279 case ARM::STC_OFFSET:
1282 case ARM::STC_OPTION:
1283 case ARM::STCL_OFFSET:
1285 case ARM::STCL_POST:
1286 case ARM::STCL_OPTION:
1287 case ARM::t2LDC_OFFSET:
1288 case ARM::t2LDC_PRE:
1289 case ARM::t2LDC_POST:
1290 case ARM::t2LDC_OPTION:
1291 case ARM::t2LDCL_OFFSET:
1292 case ARM::t2LDCL_PRE:
1293 case ARM::t2LDCL_POST:
1294 case ARM::t2LDCL_OPTION:
1295 case ARM::t2STC_OFFSET:
1296 case ARM::t2STC_PRE:
1297 case ARM::t2STC_POST:
1298 case ARM::t2STC_OPTION:
1299 case ARM::t2STCL_OFFSET:
1300 case ARM::t2STCL_PRE:
1301 case ARM::t2STCL_POST:
1302 case ARM::t2STCL_OPTION:
1303 if (coproc == 0xA || coproc == 0xB)
1304 return MCDisassembler::Fail;
1310 Inst.addOperand(MCOperand::CreateImm(coproc));
1311 Inst.addOperand(MCOperand::CreateImm(CRd));
1312 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1313 return MCDisassembler::Fail;
1315 switch (Inst.getOpcode()) {
1316 case ARM::t2LDC2_OFFSET:
1317 case ARM::t2LDC2L_OFFSET:
1318 case ARM::t2LDC2_PRE:
1319 case ARM::t2LDC2L_PRE:
1320 case ARM::t2STC2_OFFSET:
1321 case ARM::t2STC2L_OFFSET:
1322 case ARM::t2STC2_PRE:
1323 case ARM::t2STC2L_PRE:
1324 case ARM::LDC2_OFFSET:
1325 case ARM::LDC2L_OFFSET:
1327 case ARM::LDC2L_PRE:
1328 case ARM::STC2_OFFSET:
1329 case ARM::STC2L_OFFSET:
1331 case ARM::STC2L_PRE:
1332 case ARM::t2LDC_OFFSET:
1333 case ARM::t2LDCL_OFFSET:
1334 case ARM::t2LDC_PRE:
1335 case ARM::t2LDCL_PRE:
1336 case ARM::t2STC_OFFSET:
1337 case ARM::t2STCL_OFFSET:
1338 case ARM::t2STC_PRE:
1339 case ARM::t2STCL_PRE:
1340 case ARM::LDC_OFFSET:
1341 case ARM::LDCL_OFFSET:
1344 case ARM::STC_OFFSET:
1345 case ARM::STCL_OFFSET:
1348 imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm);
1349 Inst.addOperand(MCOperand::CreateImm(imm));
1351 case ARM::t2LDC2_POST:
1352 case ARM::t2LDC2L_POST:
1353 case ARM::t2STC2_POST:
1354 case ARM::t2STC2L_POST:
1355 case ARM::LDC2_POST:
1356 case ARM::LDC2L_POST:
1357 case ARM::STC2_POST:
1358 case ARM::STC2L_POST:
1359 case ARM::t2LDC_POST:
1360 case ARM::t2LDCL_POST:
1361 case ARM::t2STC_POST:
1362 case ARM::t2STCL_POST:
1364 case ARM::LDCL_POST:
1366 case ARM::STCL_POST:
1370 // The 'option' variant doesn't encode 'U' in the immediate since
1371 // the immediate is unsigned [0,255].
1372 Inst.addOperand(MCOperand::CreateImm(imm));
1376 switch (Inst.getOpcode()) {
1377 case ARM::LDC_OFFSET:
1380 case ARM::LDC_OPTION:
1381 case ARM::LDCL_OFFSET:
1383 case ARM::LDCL_POST:
1384 case ARM::LDCL_OPTION:
1385 case ARM::STC_OFFSET:
1388 case ARM::STC_OPTION:
1389 case ARM::STCL_OFFSET:
1391 case ARM::STCL_POST:
1392 case ARM::STCL_OPTION:
1393 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1394 return MCDisassembler::Fail;
1404 DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn,
1405 uint64_t Address, const void *Decoder) {
1406 DecodeStatus S = MCDisassembler::Success;
1408 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1409 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
1410 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
1411 unsigned imm = fieldFromInstruction(Insn, 0, 12);
1412 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1413 unsigned reg = fieldFromInstruction(Insn, 25, 1);
1414 unsigned P = fieldFromInstruction(Insn, 24, 1);
1415 unsigned W = fieldFromInstruction(Insn, 21, 1);
1417 // On stores, the writeback operand precedes Rt.
1418 switch (Inst.getOpcode()) {
1419 case ARM::STR_POST_IMM:
1420 case ARM::STR_POST_REG:
1421 case ARM::STRB_POST_IMM:
1422 case ARM::STRB_POST_REG:
1423 case ARM::STRT_POST_REG:
1424 case ARM::STRT_POST_IMM:
1425 case ARM::STRBT_POST_REG:
1426 case ARM::STRBT_POST_IMM:
1427 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1428 return MCDisassembler::Fail;
1434 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
1435 return MCDisassembler::Fail;
1437 // On loads, the writeback operand comes after Rt.
1438 switch (Inst.getOpcode()) {
1439 case ARM::LDR_POST_IMM:
1440 case ARM::LDR_POST_REG:
1441 case ARM::LDRB_POST_IMM:
1442 case ARM::LDRB_POST_REG:
1443 case ARM::LDRBT_POST_REG:
1444 case ARM::LDRBT_POST_IMM:
1445 case ARM::LDRT_POST_REG:
1446 case ARM::LDRT_POST_IMM:
1447 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1448 return MCDisassembler::Fail;
1454 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1455 return MCDisassembler::Fail;
1457 ARM_AM::AddrOpc Op = ARM_AM::add;
1458 if (!fieldFromInstruction(Insn, 23, 1))
1461 bool writeback = (P == 0) || (W == 1);
1462 unsigned idx_mode = 0;
1464 idx_mode = ARMII::IndexModePre;
1465 else if (!P && writeback)
1466 idx_mode = ARMII::IndexModePost;
1468 if (writeback && (Rn == 15 || Rn == Rt))
1469 S = MCDisassembler::SoftFail; // UNPREDICTABLE
1472 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1473 return MCDisassembler::Fail;
1474 ARM_AM::ShiftOpc Opc = ARM_AM::lsl;
1475 switch( fieldFromInstruction(Insn, 5, 2)) {
1489 return MCDisassembler::Fail;
1491 unsigned amt = fieldFromInstruction(Insn, 7, 5);
1492 if (Opc == ARM_AM::ror && amt == 0)
1494 unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode);
1496 Inst.addOperand(MCOperand::CreateImm(imm));
1498 Inst.addOperand(MCOperand::CreateReg(0));
1499 unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode);
1500 Inst.addOperand(MCOperand::CreateImm(tmp));
1503 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1504 return MCDisassembler::Fail;
1509 static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Val,
1510 uint64_t Address, const void *Decoder) {
1511 DecodeStatus S = MCDisassembler::Success;
1513 unsigned Rn = fieldFromInstruction(Val, 13, 4);
1514 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1515 unsigned type = fieldFromInstruction(Val, 5, 2);
1516 unsigned imm = fieldFromInstruction(Val, 7, 5);
1517 unsigned U = fieldFromInstruction(Val, 12, 1);
1519 ARM_AM::ShiftOpc ShOp = ARM_AM::lsl;
1535 if (ShOp == ARM_AM::ror && imm == 0)
1538 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1539 return MCDisassembler::Fail;
1540 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
1541 return MCDisassembler::Fail;
1544 shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp);
1546 shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp);
1547 Inst.addOperand(MCOperand::CreateImm(shift));
1553 DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn,
1554 uint64_t Address, const void *Decoder) {
1555 DecodeStatus S = MCDisassembler::Success;
1557 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
1558 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1559 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
1560 unsigned type = fieldFromInstruction(Insn, 22, 1);
1561 unsigned imm = fieldFromInstruction(Insn, 8, 4);
1562 unsigned U = ((~fieldFromInstruction(Insn, 23, 1)) & 1) << 8;
1563 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1564 unsigned W = fieldFromInstruction(Insn, 21, 1);
1565 unsigned P = fieldFromInstruction(Insn, 24, 1);
1566 unsigned Rt2 = Rt + 1;
1568 bool writeback = (W == 1) | (P == 0);
1570 // For {LD,ST}RD, Rt must be even, else undefined.
1571 switch (Inst.getOpcode()) {
1574 case ARM::STRD_POST:
1577 case ARM::LDRD_POST:
1578 if (Rt & 0x1) S = MCDisassembler::SoftFail;
1583 switch (Inst.getOpcode()) {
1586 case ARM::STRD_POST:
1587 if (P == 0 && W == 1)
1588 S = MCDisassembler::SoftFail;
1590 if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2))
1591 S = MCDisassembler::SoftFail;
1592 if (type && Rm == 15)
1593 S = MCDisassembler::SoftFail;
1595 S = MCDisassembler::SoftFail;
1596 if (!type && fieldFromInstruction(Insn, 8, 4))
1597 S = MCDisassembler::SoftFail;
1601 case ARM::STRH_POST:
1603 S = MCDisassembler::SoftFail;
1604 if (writeback && (Rn == 15 || Rn == Rt))
1605 S = MCDisassembler::SoftFail;
1606 if (!type && Rm == 15)
1607 S = MCDisassembler::SoftFail;
1611 case ARM::LDRD_POST:
1612 if (type && Rn == 15){
1614 S = MCDisassembler::SoftFail;
1617 if (P == 0 && W == 1)
1618 S = MCDisassembler::SoftFail;
1619 if (!type && (Rt2 == 15 || Rm == 15 || Rm == Rt || Rm == Rt2))
1620 S = MCDisassembler::SoftFail;
1621 if (!type && writeback && Rn == 15)
1622 S = MCDisassembler::SoftFail;
1623 if (writeback && (Rn == Rt || Rn == Rt2))
1624 S = MCDisassembler::SoftFail;
1628 case ARM::LDRH_POST:
1629 if (type && Rn == 15){
1631 S = MCDisassembler::SoftFail;
1635 S = MCDisassembler::SoftFail;
1636 if (!type && Rm == 15)
1637 S = MCDisassembler::SoftFail;
1638 if (!type && writeback && (Rn == 15 || Rn == Rt))
1639 S = MCDisassembler::SoftFail;
1642 case ARM::LDRSH_PRE:
1643 case ARM::LDRSH_POST:
1645 case ARM::LDRSB_PRE:
1646 case ARM::LDRSB_POST:
1647 if (type && Rn == 15){
1649 S = MCDisassembler::SoftFail;
1652 if (type && (Rt == 15 || (writeback && Rn == Rt)))
1653 S = MCDisassembler::SoftFail;
1654 if (!type && (Rt == 15 || Rm == 15))
1655 S = MCDisassembler::SoftFail;
1656 if (!type && writeback && (Rn == 15 || Rn == Rt))
1657 S = MCDisassembler::SoftFail;
1663 if (writeback) { // Writeback
1665 U |= ARMII::IndexModePre << 9;
1667 U |= ARMII::IndexModePost << 9;
1669 // On stores, the writeback operand precedes Rt.
1670 switch (Inst.getOpcode()) {
1673 case ARM::STRD_POST:
1676 case ARM::STRH_POST:
1677 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1678 return MCDisassembler::Fail;
1685 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
1686 return MCDisassembler::Fail;
1687 switch (Inst.getOpcode()) {
1690 case ARM::STRD_POST:
1693 case ARM::LDRD_POST:
1694 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder)))
1695 return MCDisassembler::Fail;
1702 // On loads, the writeback operand comes after Rt.
1703 switch (Inst.getOpcode()) {
1706 case ARM::LDRD_POST:
1709 case ARM::LDRH_POST:
1711 case ARM::LDRSH_PRE:
1712 case ARM::LDRSH_POST:
1714 case ARM::LDRSB_PRE:
1715 case ARM::LDRSB_POST:
1718 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1719 return MCDisassembler::Fail;
1726 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1727 return MCDisassembler::Fail;
1730 Inst.addOperand(MCOperand::CreateReg(0));
1731 Inst.addOperand(MCOperand::CreateImm(U | (imm << 4) | Rm));
1733 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
1734 return MCDisassembler::Fail;
1735 Inst.addOperand(MCOperand::CreateImm(U));
1738 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1739 return MCDisassembler::Fail;
1744 static DecodeStatus DecodeRFEInstruction(MCInst &Inst, unsigned Insn,
1745 uint64_t Address, const void *Decoder) {
1746 DecodeStatus S = MCDisassembler::Success;
1748 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1749 unsigned mode = fieldFromInstruction(Insn, 23, 2);
1766 Inst.addOperand(MCOperand::CreateImm(mode));
1767 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1768 return MCDisassembler::Fail;
1773 static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
1774 uint64_t Address, const void *Decoder) {
1775 DecodeStatus S = MCDisassembler::Success;
1777 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
1778 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
1779 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1780 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1783 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
1785 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
1786 return MCDisassembler::Fail;
1787 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1788 return MCDisassembler::Fail;
1789 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
1790 return MCDisassembler::Fail;
1791 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1792 return MCDisassembler::Fail;
1796 static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst &Inst,
1798 uint64_t Address, const void *Decoder) {
1799 DecodeStatus S = MCDisassembler::Success;
1801 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1802 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1803 unsigned reglist = fieldFromInstruction(Insn, 0, 16);
1806 // Ambiguous with RFE and SRS
1807 switch (Inst.getOpcode()) {
1809 Inst.setOpcode(ARM::RFEDA);
1811 case ARM::LDMDA_UPD:
1812 Inst.setOpcode(ARM::RFEDA_UPD);
1815 Inst.setOpcode(ARM::RFEDB);
1817 case ARM::LDMDB_UPD:
1818 Inst.setOpcode(ARM::RFEDB_UPD);
1821 Inst.setOpcode(ARM::RFEIA);
1823 case ARM::LDMIA_UPD:
1824 Inst.setOpcode(ARM::RFEIA_UPD);
1827 Inst.setOpcode(ARM::RFEIB);
1829 case ARM::LDMIB_UPD:
1830 Inst.setOpcode(ARM::RFEIB_UPD);
1833 Inst.setOpcode(ARM::SRSDA);
1835 case ARM::STMDA_UPD:
1836 Inst.setOpcode(ARM::SRSDA_UPD);
1839 Inst.setOpcode(ARM::SRSDB);
1841 case ARM::STMDB_UPD:
1842 Inst.setOpcode(ARM::SRSDB_UPD);
1845 Inst.setOpcode(ARM::SRSIA);
1847 case ARM::STMIA_UPD:
1848 Inst.setOpcode(ARM::SRSIA_UPD);
1851 Inst.setOpcode(ARM::SRSIB);
1853 case ARM::STMIB_UPD:
1854 Inst.setOpcode(ARM::SRSIB_UPD);
1857 return MCDisassembler::Fail;
1860 // For stores (which become SRS's, the only operand is the mode.
1861 if (fieldFromInstruction(Insn, 20, 1) == 0) {
1862 // Check SRS encoding constraints
1863 if (!(fieldFromInstruction(Insn, 22, 1) == 1 &&
1864 fieldFromInstruction(Insn, 20, 1) == 0))
1865 return MCDisassembler::Fail;
1868 MCOperand::CreateImm(fieldFromInstruction(Insn, 0, 4)));
1872 return DecodeRFEInstruction(Inst, Insn, Address, Decoder);
1875 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1876 return MCDisassembler::Fail;
1877 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1878 return MCDisassembler::Fail; // Tied
1879 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1880 return MCDisassembler::Fail;
1881 if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder)))
1882 return MCDisassembler::Fail;
1887 static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
1888 uint64_t Address, const void *Decoder) {
1889 unsigned imod = fieldFromInstruction(Insn, 18, 2);
1890 unsigned M = fieldFromInstruction(Insn, 17, 1);
1891 unsigned iflags = fieldFromInstruction(Insn, 6, 3);
1892 unsigned mode = fieldFromInstruction(Insn, 0, 5);
1894 DecodeStatus S = MCDisassembler::Success;
1896 // This decoder is called from multiple location that do not check
1897 // the full encoding is valid before they do.
1898 if (fieldFromInstruction(Insn, 5, 1) != 0 ||
1899 fieldFromInstruction(Insn, 16, 1) != 0 ||
1900 fieldFromInstruction(Insn, 20, 8) != 0x10)
1901 return MCDisassembler::Fail;
1903 // imod == '01' --> UNPREDICTABLE
1904 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
1905 // return failure here. The '01' imod value is unprintable, so there's
1906 // nothing useful we could do even if we returned UNPREDICTABLE.
1908 if (imod == 1) return MCDisassembler::Fail;
1911 Inst.setOpcode(ARM::CPS3p);
1912 Inst.addOperand(MCOperand::CreateImm(imod));
1913 Inst.addOperand(MCOperand::CreateImm(iflags));
1914 Inst.addOperand(MCOperand::CreateImm(mode));
1915 } else if (imod && !M) {
1916 Inst.setOpcode(ARM::CPS2p);
1917 Inst.addOperand(MCOperand::CreateImm(imod));
1918 Inst.addOperand(MCOperand::CreateImm(iflags));
1919 if (mode) S = MCDisassembler::SoftFail;
1920 } else if (!imod && M) {
1921 Inst.setOpcode(ARM::CPS1p);
1922 Inst.addOperand(MCOperand::CreateImm(mode));
1923 if (iflags) S = MCDisassembler::SoftFail;
1925 // imod == '00' && M == '0' --> UNPREDICTABLE
1926 Inst.setOpcode(ARM::CPS1p);
1927 Inst.addOperand(MCOperand::CreateImm(mode));
1928 S = MCDisassembler::SoftFail;
1934 static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
1935 uint64_t Address, const void *Decoder) {
1936 unsigned imod = fieldFromInstruction(Insn, 9, 2);
1937 unsigned M = fieldFromInstruction(Insn, 8, 1);
1938 unsigned iflags = fieldFromInstruction(Insn, 5, 3);
1939 unsigned mode = fieldFromInstruction(Insn, 0, 5);
1941 DecodeStatus S = MCDisassembler::Success;
1943 // imod == '01' --> UNPREDICTABLE
1944 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
1945 // return failure here. The '01' imod value is unprintable, so there's
1946 // nothing useful we could do even if we returned UNPREDICTABLE.
1948 if (imod == 1) return MCDisassembler::Fail;
1951 Inst.setOpcode(ARM::t2CPS3p);
1952 Inst.addOperand(MCOperand::CreateImm(imod));
1953 Inst.addOperand(MCOperand::CreateImm(iflags));
1954 Inst.addOperand(MCOperand::CreateImm(mode));
1955 } else if (imod && !M) {
1956 Inst.setOpcode(ARM::t2CPS2p);
1957 Inst.addOperand(MCOperand::CreateImm(imod));
1958 Inst.addOperand(MCOperand::CreateImm(iflags));
1959 if (mode) S = MCDisassembler::SoftFail;
1960 } else if (!imod && M) {
1961 Inst.setOpcode(ARM::t2CPS1p);
1962 Inst.addOperand(MCOperand::CreateImm(mode));
1963 if (iflags) S = MCDisassembler::SoftFail;
1965 // imod == '00' && M == '0' --> this is a HINT instruction
1966 int imm = fieldFromInstruction(Insn, 0, 8);
1967 // HINT are defined only for immediate in [0..4]
1968 if(imm > 4) return MCDisassembler::Fail;
1969 Inst.setOpcode(ARM::t2HINT);
1970 Inst.addOperand(MCOperand::CreateImm(imm));
1976 static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
1977 uint64_t Address, const void *Decoder) {
1978 DecodeStatus S = MCDisassembler::Success;
1980 unsigned Rd = fieldFromInstruction(Insn, 8, 4);
1983 imm |= (fieldFromInstruction(Insn, 0, 8) << 0);
1984 imm |= (fieldFromInstruction(Insn, 12, 3) << 8);
1985 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
1986 imm |= (fieldFromInstruction(Insn, 26, 1) << 11);
1988 if (Inst.getOpcode() == ARM::t2MOVTi16)
1989 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
1990 return MCDisassembler::Fail;
1991 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
1992 return MCDisassembler::Fail;
1994 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
1995 Inst.addOperand(MCOperand::CreateImm(imm));
2000 static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
2001 uint64_t Address, const void *Decoder) {
2002 DecodeStatus S = MCDisassembler::Success;
2004 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2005 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2008 imm |= (fieldFromInstruction(Insn, 0, 12) << 0);
2009 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2011 if (Inst.getOpcode() == ARM::MOVTi16)
2012 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2013 return MCDisassembler::Fail;
2015 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2016 return MCDisassembler::Fail;
2018 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2019 Inst.addOperand(MCOperand::CreateImm(imm));
2021 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2022 return MCDisassembler::Fail;
2027 static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
2028 uint64_t Address, const void *Decoder) {
2029 DecodeStatus S = MCDisassembler::Success;
2031 unsigned Rd = fieldFromInstruction(Insn, 16, 4);
2032 unsigned Rn = fieldFromInstruction(Insn, 0, 4);
2033 unsigned Rm = fieldFromInstruction(Insn, 8, 4);
2034 unsigned Ra = fieldFromInstruction(Insn, 12, 4);
2035 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2038 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2040 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2041 return MCDisassembler::Fail;
2042 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2043 return MCDisassembler::Fail;
2044 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2045 return MCDisassembler::Fail;
2046 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder)))
2047 return MCDisassembler::Fail;
2049 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2050 return MCDisassembler::Fail;
2055 static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
2056 uint64_t Address, const void *Decoder) {
2057 DecodeStatus S = MCDisassembler::Success;
2059 unsigned add = fieldFromInstruction(Val, 12, 1);
2060 unsigned imm = fieldFromInstruction(Val, 0, 12);
2061 unsigned Rn = fieldFromInstruction(Val, 13, 4);
2063 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2064 return MCDisassembler::Fail;
2066 if (!add) imm *= -1;
2067 if (imm == 0 && !add) imm = INT32_MIN;
2068 Inst.addOperand(MCOperand::CreateImm(imm));
2070 tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder);
2075 static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
2076 uint64_t Address, const void *Decoder) {
2077 DecodeStatus S = MCDisassembler::Success;
2079 unsigned Rn = fieldFromInstruction(Val, 9, 4);
2080 unsigned U = fieldFromInstruction(Val, 8, 1);
2081 unsigned imm = fieldFromInstruction(Val, 0, 8);
2083 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2084 return MCDisassembler::Fail;
2087 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add, imm)));
2089 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm)));
2094 static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
2095 uint64_t Address, const void *Decoder) {
2096 return DecodeGPRRegisterClass(Inst, Val, Address, Decoder);
2100 DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
2101 uint64_t Address, const void *Decoder) {
2102 DecodeStatus Status = MCDisassembler::Success;
2104 // Note the J1 and J2 values are from the encoded instruction. So here
2105 // change them to I1 and I2 values via as documented:
2106 // I1 = NOT(J1 EOR S);
2107 // I2 = NOT(J2 EOR S);
2108 // and build the imm32 with one trailing zero as documented:
2109 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
2110 unsigned S = fieldFromInstruction(Insn, 26, 1);
2111 unsigned J1 = fieldFromInstruction(Insn, 13, 1);
2112 unsigned J2 = fieldFromInstruction(Insn, 11, 1);
2113 unsigned I1 = !(J1 ^ S);
2114 unsigned I2 = !(J2 ^ S);
2115 unsigned imm10 = fieldFromInstruction(Insn, 16, 10);
2116 unsigned imm11 = fieldFromInstruction(Insn, 0, 11);
2117 unsigned tmp = (S << 23) | (I1 << 22) | (I2 << 21) | (imm10 << 11) | imm11;
2118 int imm32 = SignExtend32<25>(tmp << 1);
2119 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
2120 true, 4, Inst, Decoder))
2121 Inst.addOperand(MCOperand::CreateImm(imm32));
2127 DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn,
2128 uint64_t Address, const void *Decoder) {
2129 DecodeStatus S = MCDisassembler::Success;
2131 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2132 unsigned imm = fieldFromInstruction(Insn, 0, 24) << 2;
2135 Inst.setOpcode(ARM::BLXi);
2136 imm |= fieldFromInstruction(Insn, 24, 1) << 1;
2137 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2138 true, 4, Inst, Decoder))
2139 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm)));
2143 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2144 true, 4, Inst, Decoder))
2145 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm)));
2146 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2147 return MCDisassembler::Fail;
2153 static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
2154 uint64_t Address, const void *Decoder) {
2155 DecodeStatus S = MCDisassembler::Success;
2157 unsigned Rm = fieldFromInstruction(Val, 0, 4);
2158 unsigned align = fieldFromInstruction(Val, 4, 2);
2160 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2161 return MCDisassembler::Fail;
2163 Inst.addOperand(MCOperand::CreateImm(0));
2165 Inst.addOperand(MCOperand::CreateImm(4 << align));
2170 static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Insn,
2171 uint64_t Address, const void *Decoder) {
2172 DecodeStatus S = MCDisassembler::Success;
2174 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2175 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2176 unsigned wb = fieldFromInstruction(Insn, 16, 4);
2177 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2178 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
2179 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2181 // First output register
2182 switch (Inst.getOpcode()) {
2183 case ARM::VLD1q16: case ARM::VLD1q32: case ARM::VLD1q64: case ARM::VLD1q8:
2184 case ARM::VLD1q16wb_fixed: case ARM::VLD1q16wb_register:
2185 case ARM::VLD1q32wb_fixed: case ARM::VLD1q32wb_register:
2186 case ARM::VLD1q64wb_fixed: case ARM::VLD1q64wb_register:
2187 case ARM::VLD1q8wb_fixed: case ARM::VLD1q8wb_register:
2188 case ARM::VLD2d16: case ARM::VLD2d32: case ARM::VLD2d8:
2189 case ARM::VLD2d16wb_fixed: case ARM::VLD2d16wb_register:
2190 case ARM::VLD2d32wb_fixed: case ARM::VLD2d32wb_register:
2191 case ARM::VLD2d8wb_fixed: case ARM::VLD2d8wb_register:
2192 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2193 return MCDisassembler::Fail;
2198 case ARM::VLD2b16wb_fixed:
2199 case ARM::VLD2b16wb_register:
2200 case ARM::VLD2b32wb_fixed:
2201 case ARM::VLD2b32wb_register:
2202 case ARM::VLD2b8wb_fixed:
2203 case ARM::VLD2b8wb_register:
2204 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2205 return MCDisassembler::Fail;
2208 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2209 return MCDisassembler::Fail;
2212 // Second output register
2213 switch (Inst.getOpcode()) {
2217 case ARM::VLD3d8_UPD:
2218 case ARM::VLD3d16_UPD:
2219 case ARM::VLD3d32_UPD:
2223 case ARM::VLD4d8_UPD:
2224 case ARM::VLD4d16_UPD:
2225 case ARM::VLD4d32_UPD:
2226 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
2227 return MCDisassembler::Fail;
2232 case ARM::VLD3q8_UPD:
2233 case ARM::VLD3q16_UPD:
2234 case ARM::VLD3q32_UPD:
2238 case ARM::VLD4q8_UPD:
2239 case ARM::VLD4q16_UPD:
2240 case ARM::VLD4q32_UPD:
2241 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2242 return MCDisassembler::Fail;
2247 // Third output register
2248 switch(Inst.getOpcode()) {
2252 case ARM::VLD3d8_UPD:
2253 case ARM::VLD3d16_UPD:
2254 case ARM::VLD3d32_UPD:
2258 case ARM::VLD4d8_UPD:
2259 case ARM::VLD4d16_UPD:
2260 case ARM::VLD4d32_UPD:
2261 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2262 return MCDisassembler::Fail;
2267 case ARM::VLD3q8_UPD:
2268 case ARM::VLD3q16_UPD:
2269 case ARM::VLD3q32_UPD:
2273 case ARM::VLD4q8_UPD:
2274 case ARM::VLD4q16_UPD:
2275 case ARM::VLD4q32_UPD:
2276 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
2277 return MCDisassembler::Fail;
2283 // Fourth output register
2284 switch (Inst.getOpcode()) {
2288 case ARM::VLD4d8_UPD:
2289 case ARM::VLD4d16_UPD:
2290 case ARM::VLD4d32_UPD:
2291 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
2292 return MCDisassembler::Fail;
2297 case ARM::VLD4q8_UPD:
2298 case ARM::VLD4q16_UPD:
2299 case ARM::VLD4q32_UPD:
2300 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
2301 return MCDisassembler::Fail;
2307 // Writeback operand
2308 switch (Inst.getOpcode()) {
2309 case ARM::VLD1d8wb_fixed:
2310 case ARM::VLD1d16wb_fixed:
2311 case ARM::VLD1d32wb_fixed:
2312 case ARM::VLD1d64wb_fixed:
2313 case ARM::VLD1d8wb_register:
2314 case ARM::VLD1d16wb_register:
2315 case ARM::VLD1d32wb_register:
2316 case ARM::VLD1d64wb_register:
2317 case ARM::VLD1q8wb_fixed:
2318 case ARM::VLD1q16wb_fixed:
2319 case ARM::VLD1q32wb_fixed:
2320 case ARM::VLD1q64wb_fixed:
2321 case ARM::VLD1q8wb_register:
2322 case ARM::VLD1q16wb_register:
2323 case ARM::VLD1q32wb_register:
2324 case ARM::VLD1q64wb_register:
2325 case ARM::VLD1d8Twb_fixed:
2326 case ARM::VLD1d8Twb_register:
2327 case ARM::VLD1d16Twb_fixed:
2328 case ARM::VLD1d16Twb_register:
2329 case ARM::VLD1d32Twb_fixed:
2330 case ARM::VLD1d32Twb_register:
2331 case ARM::VLD1d64Twb_fixed:
2332 case ARM::VLD1d64Twb_register:
2333 case ARM::VLD1d8Qwb_fixed:
2334 case ARM::VLD1d8Qwb_register:
2335 case ARM::VLD1d16Qwb_fixed:
2336 case ARM::VLD1d16Qwb_register:
2337 case ARM::VLD1d32Qwb_fixed:
2338 case ARM::VLD1d32Qwb_register:
2339 case ARM::VLD1d64Qwb_fixed:
2340 case ARM::VLD1d64Qwb_register:
2341 case ARM::VLD2d8wb_fixed:
2342 case ARM::VLD2d16wb_fixed:
2343 case ARM::VLD2d32wb_fixed:
2344 case ARM::VLD2q8wb_fixed:
2345 case ARM::VLD2q16wb_fixed:
2346 case ARM::VLD2q32wb_fixed:
2347 case ARM::VLD2d8wb_register:
2348 case ARM::VLD2d16wb_register:
2349 case ARM::VLD2d32wb_register:
2350 case ARM::VLD2q8wb_register:
2351 case ARM::VLD2q16wb_register:
2352 case ARM::VLD2q32wb_register:
2353 case ARM::VLD2b8wb_fixed:
2354 case ARM::VLD2b16wb_fixed:
2355 case ARM::VLD2b32wb_fixed:
2356 case ARM::VLD2b8wb_register:
2357 case ARM::VLD2b16wb_register:
2358 case ARM::VLD2b32wb_register:
2359 Inst.addOperand(MCOperand::CreateImm(0));
2361 case ARM::VLD3d8_UPD:
2362 case ARM::VLD3d16_UPD:
2363 case ARM::VLD3d32_UPD:
2364 case ARM::VLD3q8_UPD:
2365 case ARM::VLD3q16_UPD:
2366 case ARM::VLD3q32_UPD:
2367 case ARM::VLD4d8_UPD:
2368 case ARM::VLD4d16_UPD:
2369 case ARM::VLD4d32_UPD:
2370 case ARM::VLD4q8_UPD:
2371 case ARM::VLD4q16_UPD:
2372 case ARM::VLD4q32_UPD:
2373 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
2374 return MCDisassembler::Fail;
2380 // AddrMode6 Base (register+alignment)
2381 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
2382 return MCDisassembler::Fail;
2384 // AddrMode6 Offset (register)
2385 switch (Inst.getOpcode()) {
2387 // The below have been updated to have explicit am6offset split
2388 // between fixed and register offset. For those instructions not
2389 // yet updated, we need to add an additional reg0 operand for the
2392 // The fixed offset encodes as Rm == 0xd, so we check for that.
2394 Inst.addOperand(MCOperand::CreateReg(0));
2397 // Fall through to handle the register offset variant.
2398 case ARM::VLD1d8wb_fixed:
2399 case ARM::VLD1d16wb_fixed:
2400 case ARM::VLD1d32wb_fixed:
2401 case ARM::VLD1d64wb_fixed:
2402 case ARM::VLD1d8Twb_fixed:
2403 case ARM::VLD1d16Twb_fixed:
2404 case ARM::VLD1d32Twb_fixed:
2405 case ARM::VLD1d64Twb_fixed:
2406 case ARM::VLD1d8Qwb_fixed:
2407 case ARM::VLD1d16Qwb_fixed:
2408 case ARM::VLD1d32Qwb_fixed:
2409 case ARM::VLD1d64Qwb_fixed:
2410 case ARM::VLD1d8wb_register:
2411 case ARM::VLD1d16wb_register:
2412 case ARM::VLD1d32wb_register:
2413 case ARM::VLD1d64wb_register:
2414 case ARM::VLD1q8wb_fixed:
2415 case ARM::VLD1q16wb_fixed:
2416 case ARM::VLD1q32wb_fixed:
2417 case ARM::VLD1q64wb_fixed:
2418 case ARM::VLD1q8wb_register:
2419 case ARM::VLD1q16wb_register:
2420 case ARM::VLD1q32wb_register:
2421 case ARM::VLD1q64wb_register:
2422 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
2423 // variant encodes Rm == 0xf. Anything else is a register offset post-
2424 // increment and we need to add the register operand to the instruction.
2425 if (Rm != 0xD && Rm != 0xF &&
2426 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2427 return MCDisassembler::Fail;
2429 case ARM::VLD2d8wb_fixed:
2430 case ARM::VLD2d16wb_fixed:
2431 case ARM::VLD2d32wb_fixed:
2432 case ARM::VLD2b8wb_fixed:
2433 case ARM::VLD2b16wb_fixed:
2434 case ARM::VLD2b32wb_fixed:
2435 case ARM::VLD2q8wb_fixed:
2436 case ARM::VLD2q16wb_fixed:
2437 case ARM::VLD2q32wb_fixed:
2444 static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Insn,
2445 uint64_t Address, const void *Decoder) {
2446 unsigned type = fieldFromInstruction(Insn, 8, 4);
2447 unsigned align = fieldFromInstruction(Insn, 4, 2);
2448 if (type == 6 && (align & 2)) return MCDisassembler::Fail;
2449 if (type == 7 && (align & 2)) return MCDisassembler::Fail;
2450 if (type == 10 && align == 3) return MCDisassembler::Fail;
2452 unsigned load = fieldFromInstruction(Insn, 21, 1);
2453 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
2454 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
2457 static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Insn,
2458 uint64_t Address, const void *Decoder) {
2459 unsigned size = fieldFromInstruction(Insn, 6, 2);
2460 if (size == 3) return MCDisassembler::Fail;
2462 unsigned type = fieldFromInstruction(Insn, 8, 4);
2463 unsigned align = fieldFromInstruction(Insn, 4, 2);
2464 if (type == 8 && align == 3) return MCDisassembler::Fail;
2465 if (type == 9 && align == 3) return MCDisassembler::Fail;
2467 unsigned load = fieldFromInstruction(Insn, 21, 1);
2468 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
2469 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
2472 static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Insn,
2473 uint64_t Address, const void *Decoder) {
2474 unsigned size = fieldFromInstruction(Insn, 6, 2);
2475 if (size == 3) return MCDisassembler::Fail;
2477 unsigned align = fieldFromInstruction(Insn, 4, 2);
2478 if (align & 2) return MCDisassembler::Fail;
2480 unsigned load = fieldFromInstruction(Insn, 21, 1);
2481 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
2482 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
2485 static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Insn,
2486 uint64_t Address, const void *Decoder) {
2487 unsigned size = fieldFromInstruction(Insn, 6, 2);
2488 if (size == 3) return MCDisassembler::Fail;
2490 unsigned load = fieldFromInstruction(Insn, 21, 1);
2491 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
2492 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
2495 static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Insn,
2496 uint64_t Address, const void *Decoder) {
2497 DecodeStatus S = MCDisassembler::Success;
2499 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2500 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2501 unsigned wb = fieldFromInstruction(Insn, 16, 4);
2502 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2503 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
2504 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2506 // Writeback Operand
2507 switch (Inst.getOpcode()) {
2508 case ARM::VST1d8wb_fixed:
2509 case ARM::VST1d16wb_fixed:
2510 case ARM::VST1d32wb_fixed:
2511 case ARM::VST1d64wb_fixed:
2512 case ARM::VST1d8wb_register:
2513 case ARM::VST1d16wb_register:
2514 case ARM::VST1d32wb_register:
2515 case ARM::VST1d64wb_register:
2516 case ARM::VST1q8wb_fixed:
2517 case ARM::VST1q16wb_fixed:
2518 case ARM::VST1q32wb_fixed:
2519 case ARM::VST1q64wb_fixed:
2520 case ARM::VST1q8wb_register:
2521 case ARM::VST1q16wb_register:
2522 case ARM::VST1q32wb_register:
2523 case ARM::VST1q64wb_register:
2524 case ARM::VST1d8Twb_fixed:
2525 case ARM::VST1d16Twb_fixed:
2526 case ARM::VST1d32Twb_fixed:
2527 case ARM::VST1d64Twb_fixed:
2528 case ARM::VST1d8Twb_register:
2529 case ARM::VST1d16Twb_register:
2530 case ARM::VST1d32Twb_register:
2531 case ARM::VST1d64Twb_register:
2532 case ARM::VST1d8Qwb_fixed:
2533 case ARM::VST1d16Qwb_fixed:
2534 case ARM::VST1d32Qwb_fixed:
2535 case ARM::VST1d64Qwb_fixed:
2536 case ARM::VST1d8Qwb_register:
2537 case ARM::VST1d16Qwb_register:
2538 case ARM::VST1d32Qwb_register:
2539 case ARM::VST1d64Qwb_register:
2540 case ARM::VST2d8wb_fixed:
2541 case ARM::VST2d16wb_fixed:
2542 case ARM::VST2d32wb_fixed:
2543 case ARM::VST2d8wb_register:
2544 case ARM::VST2d16wb_register:
2545 case ARM::VST2d32wb_register:
2546 case ARM::VST2q8wb_fixed:
2547 case ARM::VST2q16wb_fixed:
2548 case ARM::VST2q32wb_fixed:
2549 case ARM::VST2q8wb_register:
2550 case ARM::VST2q16wb_register:
2551 case ARM::VST2q32wb_register:
2552 case ARM::VST2b8wb_fixed:
2553 case ARM::VST2b16wb_fixed:
2554 case ARM::VST2b32wb_fixed:
2555 case ARM::VST2b8wb_register:
2556 case ARM::VST2b16wb_register:
2557 case ARM::VST2b32wb_register:
2559 return MCDisassembler::Fail;
2560 Inst.addOperand(MCOperand::CreateImm(0));
2562 case ARM::VST3d8_UPD:
2563 case ARM::VST3d16_UPD:
2564 case ARM::VST3d32_UPD:
2565 case ARM::VST3q8_UPD:
2566 case ARM::VST3q16_UPD:
2567 case ARM::VST3q32_UPD:
2568 case ARM::VST4d8_UPD:
2569 case ARM::VST4d16_UPD:
2570 case ARM::VST4d32_UPD:
2571 case ARM::VST4q8_UPD:
2572 case ARM::VST4q16_UPD:
2573 case ARM::VST4q32_UPD:
2574 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
2575 return MCDisassembler::Fail;
2581 // AddrMode6 Base (register+alignment)
2582 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
2583 return MCDisassembler::Fail;
2585 // AddrMode6 Offset (register)
2586 switch (Inst.getOpcode()) {
2589 Inst.addOperand(MCOperand::CreateReg(0));
2590 else if (Rm != 0xF) {
2591 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2592 return MCDisassembler::Fail;
2595 case ARM::VST1d8wb_fixed:
2596 case ARM::VST1d16wb_fixed:
2597 case ARM::VST1d32wb_fixed:
2598 case ARM::VST1d64wb_fixed:
2599 case ARM::VST1q8wb_fixed:
2600 case ARM::VST1q16wb_fixed:
2601 case ARM::VST1q32wb_fixed:
2602 case ARM::VST1q64wb_fixed:
2603 case ARM::VST1d8Twb_fixed:
2604 case ARM::VST1d16Twb_fixed:
2605 case ARM::VST1d32Twb_fixed:
2606 case ARM::VST1d64Twb_fixed:
2607 case ARM::VST1d8Qwb_fixed:
2608 case ARM::VST1d16Qwb_fixed:
2609 case ARM::VST1d32Qwb_fixed:
2610 case ARM::VST1d64Qwb_fixed:
2611 case ARM::VST2d8wb_fixed:
2612 case ARM::VST2d16wb_fixed:
2613 case ARM::VST2d32wb_fixed:
2614 case ARM::VST2q8wb_fixed:
2615 case ARM::VST2q16wb_fixed:
2616 case ARM::VST2q32wb_fixed:
2617 case ARM::VST2b8wb_fixed:
2618 case ARM::VST2b16wb_fixed:
2619 case ARM::VST2b32wb_fixed:
2624 // First input register
2625 switch (Inst.getOpcode()) {
2630 case ARM::VST1q16wb_fixed:
2631 case ARM::VST1q16wb_register:
2632 case ARM::VST1q32wb_fixed:
2633 case ARM::VST1q32wb_register:
2634 case ARM::VST1q64wb_fixed:
2635 case ARM::VST1q64wb_register:
2636 case ARM::VST1q8wb_fixed:
2637 case ARM::VST1q8wb_register:
2641 case ARM::VST2d16wb_fixed:
2642 case ARM::VST2d16wb_register:
2643 case ARM::VST2d32wb_fixed:
2644 case ARM::VST2d32wb_register:
2645 case ARM::VST2d8wb_fixed:
2646 case ARM::VST2d8wb_register:
2647 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2648 return MCDisassembler::Fail;
2653 case ARM::VST2b16wb_fixed:
2654 case ARM::VST2b16wb_register:
2655 case ARM::VST2b32wb_fixed:
2656 case ARM::VST2b32wb_register:
2657 case ARM::VST2b8wb_fixed:
2658 case ARM::VST2b8wb_register:
2659 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2660 return MCDisassembler::Fail;
2663 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2664 return MCDisassembler::Fail;
2667 // Second input register
2668 switch (Inst.getOpcode()) {
2672 case ARM::VST3d8_UPD:
2673 case ARM::VST3d16_UPD:
2674 case ARM::VST3d32_UPD:
2678 case ARM::VST4d8_UPD:
2679 case ARM::VST4d16_UPD:
2680 case ARM::VST4d32_UPD:
2681 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
2682 return MCDisassembler::Fail;
2687 case ARM::VST3q8_UPD:
2688 case ARM::VST3q16_UPD:
2689 case ARM::VST3q32_UPD:
2693 case ARM::VST4q8_UPD:
2694 case ARM::VST4q16_UPD:
2695 case ARM::VST4q32_UPD:
2696 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2697 return MCDisassembler::Fail;
2703 // Third input register
2704 switch (Inst.getOpcode()) {
2708 case ARM::VST3d8_UPD:
2709 case ARM::VST3d16_UPD:
2710 case ARM::VST3d32_UPD:
2714 case ARM::VST4d8_UPD:
2715 case ARM::VST4d16_UPD:
2716 case ARM::VST4d32_UPD:
2717 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2718 return MCDisassembler::Fail;
2723 case ARM::VST3q8_UPD:
2724 case ARM::VST3q16_UPD:
2725 case ARM::VST3q32_UPD:
2729 case ARM::VST4q8_UPD:
2730 case ARM::VST4q16_UPD:
2731 case ARM::VST4q32_UPD:
2732 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
2733 return MCDisassembler::Fail;
2739 // Fourth input register
2740 switch (Inst.getOpcode()) {
2744 case ARM::VST4d8_UPD:
2745 case ARM::VST4d16_UPD:
2746 case ARM::VST4d32_UPD:
2747 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
2748 return MCDisassembler::Fail;
2753 case ARM::VST4q8_UPD:
2754 case ARM::VST4q16_UPD:
2755 case ARM::VST4q32_UPD:
2756 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
2757 return MCDisassembler::Fail;
2766 static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Insn,
2767 uint64_t Address, const void *Decoder) {
2768 DecodeStatus S = MCDisassembler::Success;
2770 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2771 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2772 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2773 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2774 unsigned align = fieldFromInstruction(Insn, 4, 1);
2775 unsigned size = fieldFromInstruction(Insn, 6, 2);
2777 if (size == 0 && align == 1)
2778 return MCDisassembler::Fail;
2779 align *= (1 << size);
2781 switch (Inst.getOpcode()) {
2782 case ARM::VLD1DUPq16: case ARM::VLD1DUPq32: case ARM::VLD1DUPq8:
2783 case ARM::VLD1DUPq16wb_fixed: case ARM::VLD1DUPq16wb_register:
2784 case ARM::VLD1DUPq32wb_fixed: case ARM::VLD1DUPq32wb_register:
2785 case ARM::VLD1DUPq8wb_fixed: case ARM::VLD1DUPq8wb_register:
2786 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2787 return MCDisassembler::Fail;
2790 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2791 return MCDisassembler::Fail;
2795 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2796 return MCDisassembler::Fail;
2799 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2800 return MCDisassembler::Fail;
2801 Inst.addOperand(MCOperand::CreateImm(align));
2803 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
2804 // variant encodes Rm == 0xf. Anything else is a register offset post-
2805 // increment and we need to add the register operand to the instruction.
2806 if (Rm != 0xD && Rm != 0xF &&
2807 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2808 return MCDisassembler::Fail;
2813 static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Insn,
2814 uint64_t Address, const void *Decoder) {
2815 DecodeStatus S = MCDisassembler::Success;
2817 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2818 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2819 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2820 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2821 unsigned align = fieldFromInstruction(Insn, 4, 1);
2822 unsigned size = 1 << fieldFromInstruction(Insn, 6, 2);
2825 switch (Inst.getOpcode()) {
2826 case ARM::VLD2DUPd16: case ARM::VLD2DUPd32: case ARM::VLD2DUPd8:
2827 case ARM::VLD2DUPd16wb_fixed: case ARM::VLD2DUPd16wb_register:
2828 case ARM::VLD2DUPd32wb_fixed: case ARM::VLD2DUPd32wb_register:
2829 case ARM::VLD2DUPd8wb_fixed: case ARM::VLD2DUPd8wb_register:
2830 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2831 return MCDisassembler::Fail;
2833 case ARM::VLD2DUPd16x2: case ARM::VLD2DUPd32x2: case ARM::VLD2DUPd8x2:
2834 case ARM::VLD2DUPd16x2wb_fixed: case ARM::VLD2DUPd16x2wb_register:
2835 case ARM::VLD2DUPd32x2wb_fixed: case ARM::VLD2DUPd32x2wb_register:
2836 case ARM::VLD2DUPd8x2wb_fixed: case ARM::VLD2DUPd8x2wb_register:
2837 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2838 return MCDisassembler::Fail;
2841 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2842 return MCDisassembler::Fail;
2847 Inst.addOperand(MCOperand::CreateImm(0));
2849 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2850 return MCDisassembler::Fail;
2851 Inst.addOperand(MCOperand::CreateImm(align));
2853 if (Rm != 0xD && Rm != 0xF) {
2854 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2855 return MCDisassembler::Fail;
2861 static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Insn,
2862 uint64_t Address, const void *Decoder) {
2863 DecodeStatus S = MCDisassembler::Success;
2865 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2866 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2867 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2868 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2869 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
2871 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2872 return MCDisassembler::Fail;
2873 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
2874 return MCDisassembler::Fail;
2875 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
2876 return MCDisassembler::Fail;
2878 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2879 return MCDisassembler::Fail;
2882 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2883 return MCDisassembler::Fail;
2884 Inst.addOperand(MCOperand::CreateImm(0));
2887 Inst.addOperand(MCOperand::CreateReg(0));
2888 else if (Rm != 0xF) {
2889 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2890 return MCDisassembler::Fail;
2896 static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Insn,
2897 uint64_t Address, const void *Decoder) {
2898 DecodeStatus S = MCDisassembler::Success;
2900 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2901 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2902 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2903 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2904 unsigned size = fieldFromInstruction(Insn, 6, 2);
2905 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
2906 unsigned align = fieldFromInstruction(Insn, 4, 1);
2910 return MCDisassembler::Fail;
2923 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2924 return MCDisassembler::Fail;
2925 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
2926 return MCDisassembler::Fail;
2927 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
2928 return MCDisassembler::Fail;
2929 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder)))
2930 return MCDisassembler::Fail;
2932 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2933 return MCDisassembler::Fail;
2936 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2937 return MCDisassembler::Fail;
2938 Inst.addOperand(MCOperand::CreateImm(align));
2941 Inst.addOperand(MCOperand::CreateReg(0));
2942 else if (Rm != 0xF) {
2943 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2944 return MCDisassembler::Fail;
2951 DecodeNEONModImmInstruction(MCInst &Inst, unsigned Insn,
2952 uint64_t Address, const void *Decoder) {
2953 DecodeStatus S = MCDisassembler::Success;
2955 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2956 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2957 unsigned imm = fieldFromInstruction(Insn, 0, 4);
2958 imm |= fieldFromInstruction(Insn, 16, 3) << 4;
2959 imm |= fieldFromInstruction(Insn, 24, 1) << 7;
2960 imm |= fieldFromInstruction(Insn, 8, 4) << 8;
2961 imm |= fieldFromInstruction(Insn, 5, 1) << 12;
2962 unsigned Q = fieldFromInstruction(Insn, 6, 1);
2965 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
2966 return MCDisassembler::Fail;
2968 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2969 return MCDisassembler::Fail;
2972 Inst.addOperand(MCOperand::CreateImm(imm));
2974 switch (Inst.getOpcode()) {
2975 case ARM::VORRiv4i16:
2976 case ARM::VORRiv2i32:
2977 case ARM::VBICiv4i16:
2978 case ARM::VBICiv2i32:
2979 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2980 return MCDisassembler::Fail;
2982 case ARM::VORRiv8i16:
2983 case ARM::VORRiv4i32:
2984 case ARM::VBICiv8i16:
2985 case ARM::VBICiv4i32:
2986 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
2987 return MCDisassembler::Fail;
2996 static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Insn,
2997 uint64_t Address, const void *Decoder) {
2998 DecodeStatus S = MCDisassembler::Success;
3000 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3001 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3002 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3003 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3004 unsigned size = fieldFromInstruction(Insn, 18, 2);
3006 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3007 return MCDisassembler::Fail;
3008 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3009 return MCDisassembler::Fail;
3010 Inst.addOperand(MCOperand::CreateImm(8 << size));
3015 static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
3016 uint64_t Address, const void *Decoder) {
3017 Inst.addOperand(MCOperand::CreateImm(8 - Val));
3018 return MCDisassembler::Success;
3021 static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
3022 uint64_t Address, const void *Decoder) {
3023 Inst.addOperand(MCOperand::CreateImm(16 - Val));
3024 return MCDisassembler::Success;
3027 static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
3028 uint64_t Address, const void *Decoder) {
3029 Inst.addOperand(MCOperand::CreateImm(32 - Val));
3030 return MCDisassembler::Success;
3033 static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
3034 uint64_t Address, const void *Decoder) {
3035 Inst.addOperand(MCOperand::CreateImm(64 - Val));
3036 return MCDisassembler::Success;
3039 static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
3040 uint64_t Address, const void *Decoder) {
3041 DecodeStatus S = MCDisassembler::Success;
3043 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3044 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3045 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3046 Rn |= fieldFromInstruction(Insn, 7, 1) << 4;
3047 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3048 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3049 unsigned op = fieldFromInstruction(Insn, 6, 1);
3051 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3052 return MCDisassembler::Fail;
3054 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3055 return MCDisassembler::Fail; // Writeback
3058 switch (Inst.getOpcode()) {
3061 if (!Check(S, DecodeDPairRegisterClass(Inst, Rn, Address, Decoder)))
3062 return MCDisassembler::Fail;
3065 if (!Check(S, DecodeDPRRegisterClass(Inst, Rn, Address, Decoder)))
3066 return MCDisassembler::Fail;
3069 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3070 return MCDisassembler::Fail;
3075 static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
3076 uint64_t Address, const void *Decoder) {
3077 DecodeStatus S = MCDisassembler::Success;
3079 unsigned dst = fieldFromInstruction(Insn, 8, 3);
3080 unsigned imm = fieldFromInstruction(Insn, 0, 8);
3082 if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder)))
3083 return MCDisassembler::Fail;
3085 switch(Inst.getOpcode()) {
3087 return MCDisassembler::Fail;
3089 break; // tADR does not explicitly represent the PC as an operand.
3091 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3095 Inst.addOperand(MCOperand::CreateImm(imm));
3099 static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
3100 uint64_t Address, const void *Decoder) {
3101 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<12>(Val<<1) + 4,
3102 true, 2, Inst, Decoder))
3103 Inst.addOperand(MCOperand::CreateImm(SignExtend32<12>(Val << 1)));
3104 return MCDisassembler::Success;
3107 static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
3108 uint64_t Address, const void *Decoder) {
3109 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<21>(Val) + 4,
3110 true, 4, Inst, Decoder))
3111 Inst.addOperand(MCOperand::CreateImm(SignExtend32<21>(Val)));
3112 return MCDisassembler::Success;
3115 static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
3116 uint64_t Address, const void *Decoder) {
3117 if (!tryAddingSymbolicOperand(Address, Address + (Val<<1) + 4,
3118 true, 2, Inst, Decoder))
3119 Inst.addOperand(MCOperand::CreateImm(Val << 1));
3120 return MCDisassembler::Success;
3123 static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
3124 uint64_t Address, const void *Decoder) {
3125 DecodeStatus S = MCDisassembler::Success;
3127 unsigned Rn = fieldFromInstruction(Val, 0, 3);
3128 unsigned Rm = fieldFromInstruction(Val, 3, 3);
3130 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
3131 return MCDisassembler::Fail;
3132 if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder)))
3133 return MCDisassembler::Fail;
3138 static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
3139 uint64_t Address, const void *Decoder) {
3140 DecodeStatus S = MCDisassembler::Success;
3142 unsigned Rn = fieldFromInstruction(Val, 0, 3);
3143 unsigned imm = fieldFromInstruction(Val, 3, 5);
3145 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
3146 return MCDisassembler::Fail;
3147 Inst.addOperand(MCOperand::CreateImm(imm));
3152 static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
3153 uint64_t Address, const void *Decoder) {
3154 unsigned imm = Val << 2;
3156 Inst.addOperand(MCOperand::CreateImm(imm));
3157 tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder);
3159 return MCDisassembler::Success;
3162 static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
3163 uint64_t Address, const void *Decoder) {
3164 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3165 Inst.addOperand(MCOperand::CreateImm(Val));
3167 return MCDisassembler::Success;
3170 static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
3171 uint64_t Address, const void *Decoder) {
3172 DecodeStatus S = MCDisassembler::Success;
3174 unsigned Rn = fieldFromInstruction(Val, 6, 4);
3175 unsigned Rm = fieldFromInstruction(Val, 2, 4);
3176 unsigned imm = fieldFromInstruction(Val, 0, 2);
3178 // Thumb stores cannot use PC as dest register.
3179 switch (Inst.getOpcode()) {
3184 return MCDisassembler::Fail;
3189 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3190 return MCDisassembler::Fail;
3191 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
3192 return MCDisassembler::Fail;
3193 Inst.addOperand(MCOperand::CreateImm(imm));
3198 static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Insn,
3199 uint64_t Address, const void *Decoder) {
3200 DecodeStatus S = MCDisassembler::Success;
3202 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3203 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3206 switch (Inst.getOpcode()) {
3208 Inst.setOpcode(ARM::t2LDRBpci);
3211 Inst.setOpcode(ARM::t2LDRHpci);
3214 Inst.setOpcode(ARM::t2LDRSHpci);
3217 Inst.setOpcode(ARM::t2LDRSBpci);
3220 Inst.setOpcode(ARM::t2LDRpci);
3223 Inst.setOpcode(ARM::t2PLDpci);
3226 Inst.setOpcode(ARM::t2PLIpci);
3229 return MCDisassembler::Fail;
3232 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3236 switch (Inst.getOpcode()) {
3238 return MCDisassembler::Fail;
3240 // FIXME: this instruction is only available with MP extensions,
3241 // this should be checked first but we don't have access to the
3242 // feature bits here.
3243 Inst.setOpcode(ARM::t2PLDWs);
3250 switch (Inst.getOpcode()) {
3256 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3257 return MCDisassembler::Fail;
3260 unsigned addrmode = fieldFromInstruction(Insn, 4, 2);
3261 addrmode |= fieldFromInstruction(Insn, 0, 4) << 2;
3262 addrmode |= fieldFromInstruction(Insn, 16, 4) << 6;
3263 if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder)))
3264 return MCDisassembler::Fail;
3269 static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
3270 uint64_t Address, const void* Decoder) {
3271 DecodeStatus S = MCDisassembler::Success;
3273 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3274 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3275 unsigned U = fieldFromInstruction(Insn, 9, 1);
3276 unsigned imm = fieldFromInstruction(Insn, 0, 8);
3281 switch (Inst.getOpcode()) {
3283 Inst.setOpcode(ARM::t2LDRpci);
3286 Inst.setOpcode(ARM::t2LDRBpci);
3288 case ARM::t2LDRSBi8:
3289 Inst.setOpcode(ARM::t2LDRSBpci);
3292 Inst.setOpcode(ARM::t2LDRHpci);
3294 case ARM::t2LDRSHi8:
3295 Inst.setOpcode(ARM::t2LDRSHpci);
3298 Inst.setOpcode(ARM::t2PLDpci);
3301 Inst.setOpcode(ARM::t2PLIpci);
3304 return MCDisassembler::Fail;
3306 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3310 switch (Inst.getOpcode()) {
3311 case ARM::t2LDRSHi8:
3312 return MCDisassembler::Fail;
3318 switch (Inst.getOpcode()) {
3323 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3324 return MCDisassembler::Fail;
3327 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
3328 return MCDisassembler::Fail;
3332 static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
3333 uint64_t Address, const void* Decoder) {
3334 DecodeStatus S = MCDisassembler::Success;
3336 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3337 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3338 unsigned imm = fieldFromInstruction(Insn, 0, 12);
3342 switch (Inst.getOpcode()) {
3344 Inst.setOpcode(ARM::t2LDRpci);
3346 case ARM::t2LDRHi12:
3347 Inst.setOpcode(ARM::t2LDRHpci);
3349 case ARM::t2LDRSHi12:
3350 Inst.setOpcode(ARM::t2LDRSHpci);
3352 case ARM::t2LDRBi12:
3353 Inst.setOpcode(ARM::t2LDRBpci);
3355 case ARM::t2LDRSBi12:
3356 Inst.setOpcode(ARM::t2LDRSBpci);
3359 Inst.setOpcode(ARM::t2PLDpci);
3362 Inst.setOpcode(ARM::t2PLIpci);
3365 return MCDisassembler::Fail;
3367 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3371 switch (Inst.getOpcode()) {
3372 case ARM::t2LDRSHi12:
3373 return MCDisassembler::Fail;
3374 case ARM::t2LDRHi12:
3375 Inst.setOpcode(ARM::t2PLDi12);
3382 switch (Inst.getOpcode()) {
3387 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3388 return MCDisassembler::Fail;
3391 if (!Check(S, DecodeT2AddrModeImm12(Inst, imm, Address, Decoder)))
3392 return MCDisassembler::Fail;
3396 static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn,
3397 uint64_t Address, const void* Decoder) {
3398 DecodeStatus S = MCDisassembler::Success;
3400 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3401 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3402 unsigned imm = fieldFromInstruction(Insn, 0, 8);
3406 switch (Inst.getOpcode()) {
3408 Inst.setOpcode(ARM::t2LDRpci);
3411 Inst.setOpcode(ARM::t2LDRBpci);
3414 Inst.setOpcode(ARM::t2LDRHpci);
3417 Inst.setOpcode(ARM::t2LDRSBpci);
3420 Inst.setOpcode(ARM::t2LDRSHpci);
3423 return MCDisassembler::Fail;
3425 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3428 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
3429 return MCDisassembler::Fail;
3430 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
3431 return MCDisassembler::Fail;
3435 static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
3436 uint64_t Address, const void* Decoder) {
3437 DecodeStatus S = MCDisassembler::Success;
3439 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3440 unsigned U = fieldFromInstruction(Insn, 23, 1);
3441 int imm = fieldFromInstruction(Insn, 0, 12);
3444 switch (Inst.getOpcode()) {
3445 case ARM::t2LDRBpci:
3446 case ARM::t2LDRHpci:
3447 Inst.setOpcode(ARM::t2PLDpci);
3449 case ARM::t2LDRSBpci:
3450 Inst.setOpcode(ARM::t2PLIpci);
3452 case ARM::t2LDRSHpci:
3453 return MCDisassembler::Fail;
3459 switch(Inst.getOpcode()) {
3464 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3465 return MCDisassembler::Fail;
3469 // Special case for #-0.
3475 Inst.addOperand(MCOperand::CreateImm(imm));
3480 static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val,
3481 uint64_t Address, const void *Decoder) {
3483 Inst.addOperand(MCOperand::CreateImm(INT32_MIN));
3485 int imm = Val & 0xFF;
3487 if (!(Val & 0x100)) imm *= -1;
3488 Inst.addOperand(MCOperand::CreateImm(imm * 4));
3491 return MCDisassembler::Success;
3494 static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
3495 uint64_t Address, const void *Decoder) {
3496 DecodeStatus S = MCDisassembler::Success;
3498 unsigned Rn = fieldFromInstruction(Val, 9, 4);
3499 unsigned imm = fieldFromInstruction(Val, 0, 9);
3501 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3502 return MCDisassembler::Fail;
3503 if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder)))
3504 return MCDisassembler::Fail;
3509 static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val,
3510 uint64_t Address, const void *Decoder) {
3511 DecodeStatus S = MCDisassembler::Success;
3513 unsigned Rn = fieldFromInstruction(Val, 8, 4);
3514 unsigned imm = fieldFromInstruction(Val, 0, 8);
3516 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
3517 return MCDisassembler::Fail;
3519 Inst.addOperand(MCOperand::CreateImm(imm));
3524 static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val,
3525 uint64_t Address, const void *Decoder) {
3526 int imm = Val & 0xFF;
3529 else if (!(Val & 0x100))
3531 Inst.addOperand(MCOperand::CreateImm(imm));
3533 return MCDisassembler::Success;
3537 static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
3538 uint64_t Address, const void *Decoder) {
3539 DecodeStatus S = MCDisassembler::Success;
3541 unsigned Rn = fieldFromInstruction(Val, 9, 4);
3542 unsigned imm = fieldFromInstruction(Val, 0, 9);
3544 // Thumb stores cannot use PC as dest register.
3545 switch (Inst.getOpcode()) {
3553 return MCDisassembler::Fail;
3559 // Some instructions always use an additive offset.
3560 switch (Inst.getOpcode()) {
3575 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3576 return MCDisassembler::Fail;
3577 if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder)))
3578 return MCDisassembler::Fail;
3583 static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Insn,
3584 uint64_t Address, const void *Decoder) {
3585 DecodeStatus S = MCDisassembler::Success;
3587 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3588 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3589 unsigned addr = fieldFromInstruction(Insn, 0, 8);
3590 addr |= fieldFromInstruction(Insn, 9, 1) << 8;
3592 unsigned load = fieldFromInstruction(Insn, 20, 1);
3595 switch (Inst.getOpcode()) {
3596 case ARM::t2LDR_PRE:
3597 case ARM::t2LDR_POST:
3598 Inst.setOpcode(ARM::t2LDRpci);
3600 case ARM::t2LDRB_PRE:
3601 case ARM::t2LDRB_POST:
3602 Inst.setOpcode(ARM::t2LDRBpci);
3604 case ARM::t2LDRH_PRE:
3605 case ARM::t2LDRH_POST:
3606 Inst.setOpcode(ARM::t2LDRHpci);
3608 case ARM::t2LDRSB_PRE:
3609 case ARM::t2LDRSB_POST:
3611 Inst.setOpcode(ARM::t2PLIpci);
3613 Inst.setOpcode(ARM::t2LDRSBpci);
3615 case ARM::t2LDRSH_PRE:
3616 case ARM::t2LDRSH_POST:
3617 Inst.setOpcode(ARM::t2LDRSHpci);
3620 return MCDisassembler::Fail;
3622 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3626 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3627 return MCDisassembler::Fail;
3630 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3631 return MCDisassembler::Fail;
3634 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3635 return MCDisassembler::Fail;
3638 if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder)))
3639 return MCDisassembler::Fail;
3644 static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
3645 uint64_t Address, const void *Decoder) {
3646 DecodeStatus S = MCDisassembler::Success;
3648 unsigned Rn = fieldFromInstruction(Val, 13, 4);
3649 unsigned imm = fieldFromInstruction(Val, 0, 12);
3651 // Thumb stores cannot use PC as dest register.
3652 switch (Inst.getOpcode()) {
3654 case ARM::t2STRBi12:
3655 case ARM::t2STRHi12:
3657 return MCDisassembler::Fail;
3662 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3663 return MCDisassembler::Fail;
3664 Inst.addOperand(MCOperand::CreateImm(imm));
3670 static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Insn,
3671 uint64_t Address, const void *Decoder) {
3672 unsigned imm = fieldFromInstruction(Insn, 0, 7);
3674 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3675 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3676 Inst.addOperand(MCOperand::CreateImm(imm));
3678 return MCDisassembler::Success;
3681 static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
3682 uint64_t Address, const void *Decoder) {
3683 DecodeStatus S = MCDisassembler::Success;
3685 if (Inst.getOpcode() == ARM::tADDrSP) {
3686 unsigned Rdm = fieldFromInstruction(Insn, 0, 3);
3687 Rdm |= fieldFromInstruction(Insn, 7, 1) << 3;
3689 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
3690 return MCDisassembler::Fail;
3691 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3692 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
3693 return MCDisassembler::Fail;
3694 } else if (Inst.getOpcode() == ARM::tADDspr) {
3695 unsigned Rm = fieldFromInstruction(Insn, 3, 4);
3697 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3698 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3699 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3700 return MCDisassembler::Fail;
3706 static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn,
3707 uint64_t Address, const void *Decoder) {
3708 unsigned imod = fieldFromInstruction(Insn, 4, 1) | 0x2;
3709 unsigned flags = fieldFromInstruction(Insn, 0, 3);
3711 Inst.addOperand(MCOperand::CreateImm(imod));
3712 Inst.addOperand(MCOperand::CreateImm(flags));
3714 return MCDisassembler::Success;
3717 static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn,
3718 uint64_t Address, const void *Decoder) {
3719 DecodeStatus S = MCDisassembler::Success;
3720 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3721 unsigned add = fieldFromInstruction(Insn, 4, 1);
3723 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
3724 return MCDisassembler::Fail;
3725 Inst.addOperand(MCOperand::CreateImm(add));
3730 static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Val,
3731 uint64_t Address, const void *Decoder) {
3732 // Val is passed in as S:J1:J2:imm10H:imm10L:'0'
3733 // Note only one trailing zero not two. Also the J1 and J2 values are from
3734 // the encoded instruction. So here change to I1 and I2 values via:
3735 // I1 = NOT(J1 EOR S);
3736 // I2 = NOT(J2 EOR S);
3737 // and build the imm32 with two trailing zeros as documented:
3738 // imm32 = SignExtend(S:I1:I2:imm10H:imm10L:'00', 32);
3739 unsigned S = (Val >> 23) & 1;
3740 unsigned J1 = (Val >> 22) & 1;
3741 unsigned J2 = (Val >> 21) & 1;
3742 unsigned I1 = !(J1 ^ S);
3743 unsigned I2 = !(J2 ^ S);
3744 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21);
3745 int imm32 = SignExtend32<25>(tmp << 1);
3747 if (!tryAddingSymbolicOperand(Address,
3748 (Address & ~2u) + imm32 + 4,
3749 true, 4, Inst, Decoder))
3750 Inst.addOperand(MCOperand::CreateImm(imm32));
3751 return MCDisassembler::Success;
3754 static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Val,
3755 uint64_t Address, const void *Decoder) {
3756 if (Val == 0xA || Val == 0xB)
3757 return MCDisassembler::Fail;
3759 Inst.addOperand(MCOperand::CreateImm(Val));
3760 return MCDisassembler::Success;
3764 DecodeThumbTableBranch(MCInst &Inst, unsigned Insn,
3765 uint64_t Address, const void *Decoder) {
3766 DecodeStatus S = MCDisassembler::Success;
3768 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3769 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3771 if (Rn == ARM::SP) S = MCDisassembler::SoftFail;
3772 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3773 return MCDisassembler::Fail;
3774 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
3775 return MCDisassembler::Fail;
3780 DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Insn,
3781 uint64_t Address, const void *Decoder) {
3782 DecodeStatus S = MCDisassembler::Success;
3784 unsigned pred = fieldFromInstruction(Insn, 22, 4);
3785 if (pred == 0xE || pred == 0xF) {
3786 unsigned opc = fieldFromInstruction(Insn, 4, 28);
3789 return MCDisassembler::Fail;
3791 Inst.setOpcode(ARM::t2DSB);
3794 Inst.setOpcode(ARM::t2DMB);
3797 Inst.setOpcode(ARM::t2ISB);
3801 unsigned imm = fieldFromInstruction(Insn, 0, 4);
3802 return DecodeMemBarrierOption(Inst, imm, Address, Decoder);
3805 unsigned brtarget = fieldFromInstruction(Insn, 0, 11) << 1;
3806 brtarget |= fieldFromInstruction(Insn, 11, 1) << 19;
3807 brtarget |= fieldFromInstruction(Insn, 13, 1) << 18;
3808 brtarget |= fieldFromInstruction(Insn, 16, 6) << 12;
3809 brtarget |= fieldFromInstruction(Insn, 26, 1) << 20;
3811 if (!Check(S, DecodeT2BROperand(Inst, brtarget, Address, Decoder)))
3812 return MCDisassembler::Fail;
3813 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
3814 return MCDisassembler::Fail;
3819 // Decode a shifted immediate operand. These basically consist
3820 // of an 8-bit value, and a 4-bit directive that specifies either
3821 // a splat operation or a rotation.
3822 static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val,
3823 uint64_t Address, const void *Decoder) {
3824 unsigned ctrl = fieldFromInstruction(Val, 10, 2);
3826 unsigned byte = fieldFromInstruction(Val, 8, 2);
3827 unsigned imm = fieldFromInstruction(Val, 0, 8);
3830 Inst.addOperand(MCOperand::CreateImm(imm));
3833 Inst.addOperand(MCOperand::CreateImm((imm << 16) | imm));
3836 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 8)));
3839 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 16) |
3844 unsigned unrot = fieldFromInstruction(Val, 0, 7) | 0x80;
3845 unsigned rot = fieldFromInstruction(Val, 7, 5);
3846 unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31));
3847 Inst.addOperand(MCOperand::CreateImm(imm));
3850 return MCDisassembler::Success;
3854 DecodeThumbBCCTargetOperand(MCInst &Inst, unsigned Val,
3855 uint64_t Address, const void *Decoder){
3856 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<9>(Val<<1) + 4,
3857 true, 2, Inst, Decoder))
3858 Inst.addOperand(MCOperand::CreateImm(SignExtend32<9>(Val << 1)));
3859 return MCDisassembler::Success;
3862 static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val,
3863 uint64_t Address, const void *Decoder){
3864 // Val is passed in as S:J1:J2:imm10:imm11
3865 // Note no trailing zero after imm11. Also the J1 and J2 values are from
3866 // the encoded instruction. So here change to I1 and I2 values via:
3867 // I1 = NOT(J1 EOR S);
3868 // I2 = NOT(J2 EOR S);
3869 // and build the imm32 with one trailing zero as documented:
3870 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
3871 unsigned S = (Val >> 23) & 1;
3872 unsigned J1 = (Val >> 22) & 1;
3873 unsigned J2 = (Val >> 21) & 1;
3874 unsigned I1 = !(J1 ^ S);
3875 unsigned I2 = !(J2 ^ S);
3876 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21);
3877 int imm32 = SignExtend32<25>(tmp << 1);
3879 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
3880 true, 4, Inst, Decoder))
3881 Inst.addOperand(MCOperand::CreateImm(imm32));
3882 return MCDisassembler::Success;
3885 static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Val,
3886 uint64_t Address, const void *Decoder) {
3888 return MCDisassembler::Fail;
3890 Inst.addOperand(MCOperand::CreateImm(Val));
3891 return MCDisassembler::Success;
3894 static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Val,
3895 uint64_t Address, const void *Decoder) {
3897 return MCDisassembler::Fail;
3899 Inst.addOperand(MCOperand::CreateImm(Val));
3900 return MCDisassembler::Success;
3903 static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Val,
3904 uint64_t Address, const void *Decoder) {
3905 if (!Val) return MCDisassembler::Fail;
3906 Inst.addOperand(MCOperand::CreateImm(Val));
3907 return MCDisassembler::Success;
3910 static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn,
3911 uint64_t Address, const void *Decoder) {
3912 DecodeStatus S = MCDisassembler::Success;
3914 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3915 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3916 unsigned pred = fieldFromInstruction(Insn, 28, 4);
3919 S = MCDisassembler::SoftFail;
3921 if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder)))
3922 return MCDisassembler::Fail;
3923 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3924 return MCDisassembler::Fail;
3925 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
3926 return MCDisassembler::Fail;
3931 static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn,
3932 uint64_t Address, const void *Decoder){
3933 DecodeStatus S = MCDisassembler::Success;
3935 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3936 unsigned Rt = fieldFromInstruction(Insn, 0, 4);
3937 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3938 unsigned pred = fieldFromInstruction(Insn, 28, 4);
3940 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
3941 return MCDisassembler::Fail;
3943 if (Rn == 0xF || Rd == Rn || Rd == Rt || Rd == Rt+1)
3944 S = MCDisassembler::SoftFail;
3946 if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder)))
3947 return MCDisassembler::Fail;
3948 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3949 return MCDisassembler::Fail;
3950 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
3951 return MCDisassembler::Fail;
3956 static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn,
3957 uint64_t Address, const void *Decoder) {
3958 DecodeStatus S = MCDisassembler::Success;
3960 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3961 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3962 unsigned imm = fieldFromInstruction(Insn, 0, 12);
3963 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
3964 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
3965 unsigned pred = fieldFromInstruction(Insn, 28, 4);
3967 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
3969 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3970 return MCDisassembler::Fail;
3971 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3972 return MCDisassembler::Fail;
3973 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder)))
3974 return MCDisassembler::Fail;
3975 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
3976 return MCDisassembler::Fail;
3981 static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn,
3982 uint64_t Address, const void *Decoder) {
3983 DecodeStatus S = MCDisassembler::Success;
3985 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3986 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3987 unsigned imm = fieldFromInstruction(Insn, 0, 12);
3988 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
3989 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
3990 unsigned pred = fieldFromInstruction(Insn, 28, 4);
3991 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3993 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
3994 if (Rm == 0xF) S = MCDisassembler::SoftFail;
3996 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3997 return MCDisassembler::Fail;
3998 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3999 return MCDisassembler::Fail;
4000 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder)))
4001 return MCDisassembler::Fail;
4002 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4003 return MCDisassembler::Fail;
4009 static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn,
4010 uint64_t Address, const void *Decoder) {
4011 DecodeStatus S = MCDisassembler::Success;
4013 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4014 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4015 unsigned imm = fieldFromInstruction(Insn, 0, 12);
4016 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
4017 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
4018 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4020 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
4022 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4023 return MCDisassembler::Fail;
4024 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4025 return MCDisassembler::Fail;
4026 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder)))
4027 return MCDisassembler::Fail;
4028 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4029 return MCDisassembler::Fail;
4034 static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn,
4035 uint64_t Address, const void *Decoder) {
4036 DecodeStatus S = MCDisassembler::Success;
4038 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4039 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4040 unsigned imm = fieldFromInstruction(Insn, 0, 12);
4041 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
4042 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
4043 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4045 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
4047 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4048 return MCDisassembler::Fail;
4049 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4050 return MCDisassembler::Fail;
4051 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder)))
4052 return MCDisassembler::Fail;
4053 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4054 return MCDisassembler::Fail;
4059 static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn,
4060 uint64_t Address, const void *Decoder) {
4061 DecodeStatus S = MCDisassembler::Success;
4063 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4064 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4065 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4066 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4067 unsigned size = fieldFromInstruction(Insn, 10, 2);
4073 return MCDisassembler::Fail;
4075 if (fieldFromInstruction(Insn, 4, 1))
4076 return MCDisassembler::Fail; // UNDEFINED
4077 index = fieldFromInstruction(Insn, 5, 3);
4080 if (fieldFromInstruction(Insn, 5, 1))
4081 return MCDisassembler::Fail; // UNDEFINED
4082 index = fieldFromInstruction(Insn, 6, 2);
4083 if (fieldFromInstruction(Insn, 4, 1))
4087 if (fieldFromInstruction(Insn, 6, 1))
4088 return MCDisassembler::Fail; // UNDEFINED
4089 index = fieldFromInstruction(Insn, 7, 1);
4091 switch (fieldFromInstruction(Insn, 4, 2)) {
4097 return MCDisassembler::Fail;
4102 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4103 return MCDisassembler::Fail;
4104 if (Rm != 0xF) { // Writeback
4105 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4106 return MCDisassembler::Fail;
4108 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4109 return MCDisassembler::Fail;
4110 Inst.addOperand(MCOperand::CreateImm(align));
4113 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4114 return MCDisassembler::Fail;
4116 Inst.addOperand(MCOperand::CreateReg(0));
4119 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4120 return MCDisassembler::Fail;
4121 Inst.addOperand(MCOperand::CreateImm(index));
4126 static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn,
4127 uint64_t Address, const void *Decoder) {
4128 DecodeStatus S = MCDisassembler::Success;
4130 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4131 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4132 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4133 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4134 unsigned size = fieldFromInstruction(Insn, 10, 2);
4140 return MCDisassembler::Fail;
4142 if (fieldFromInstruction(Insn, 4, 1))
4143 return MCDisassembler::Fail; // UNDEFINED
4144 index = fieldFromInstruction(Insn, 5, 3);
4147 if (fieldFromInstruction(Insn, 5, 1))
4148 return MCDisassembler::Fail; // UNDEFINED
4149 index = fieldFromInstruction(Insn, 6, 2);
4150 if (fieldFromInstruction(Insn, 4, 1))
4154 if (fieldFromInstruction(Insn, 6, 1))
4155 return MCDisassembler::Fail; // UNDEFINED
4156 index = fieldFromInstruction(Insn, 7, 1);
4158 switch (fieldFromInstruction(Insn, 4, 2)) {
4164 return MCDisassembler::Fail;
4169 if (Rm != 0xF) { // Writeback
4170 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4171 return MCDisassembler::Fail;
4173 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4174 return MCDisassembler::Fail;
4175 Inst.addOperand(MCOperand::CreateImm(align));
4178 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4179 return MCDisassembler::Fail;
4181 Inst.addOperand(MCOperand::CreateReg(0));
4184 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4185 return MCDisassembler::Fail;
4186 Inst.addOperand(MCOperand::CreateImm(index));
4192 static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn,
4193 uint64_t Address, const void *Decoder) {
4194 DecodeStatus S = MCDisassembler::Success;
4196 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4197 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4198 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4199 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4200 unsigned size = fieldFromInstruction(Insn, 10, 2);
4207 return MCDisassembler::Fail;
4209 index = fieldFromInstruction(Insn, 5, 3);
4210 if (fieldFromInstruction(Insn, 4, 1))
4214 index = fieldFromInstruction(Insn, 6, 2);
4215 if (fieldFromInstruction(Insn, 4, 1))
4217 if (fieldFromInstruction(Insn, 5, 1))
4221 if (fieldFromInstruction(Insn, 5, 1))
4222 return MCDisassembler::Fail; // UNDEFINED
4223 index = fieldFromInstruction(Insn, 7, 1);
4224 if (fieldFromInstruction(Insn, 4, 1) != 0)
4226 if (fieldFromInstruction(Insn, 6, 1))
4231 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4232 return MCDisassembler::Fail;
4233 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4234 return MCDisassembler::Fail;
4235 if (Rm != 0xF) { // Writeback
4236 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4237 return MCDisassembler::Fail;
4239 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4240 return MCDisassembler::Fail;
4241 Inst.addOperand(MCOperand::CreateImm(align));
4244 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4245 return MCDisassembler::Fail;
4247 Inst.addOperand(MCOperand::CreateReg(0));
4250 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4251 return MCDisassembler::Fail;
4252 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4253 return MCDisassembler::Fail;
4254 Inst.addOperand(MCOperand::CreateImm(index));
4259 static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn,
4260 uint64_t Address, const void *Decoder) {
4261 DecodeStatus S = MCDisassembler::Success;
4263 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4264 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4265 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4266 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4267 unsigned size = fieldFromInstruction(Insn, 10, 2);
4274 return MCDisassembler::Fail;
4276 index = fieldFromInstruction(Insn, 5, 3);
4277 if (fieldFromInstruction(Insn, 4, 1))
4281 index = fieldFromInstruction(Insn, 6, 2);
4282 if (fieldFromInstruction(Insn, 4, 1))
4284 if (fieldFromInstruction(Insn, 5, 1))
4288 if (fieldFromInstruction(Insn, 5, 1))
4289 return MCDisassembler::Fail; // UNDEFINED
4290 index = fieldFromInstruction(Insn, 7, 1);
4291 if (fieldFromInstruction(Insn, 4, 1) != 0)
4293 if (fieldFromInstruction(Insn, 6, 1))
4298 if (Rm != 0xF) { // Writeback
4299 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4300 return MCDisassembler::Fail;
4302 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4303 return MCDisassembler::Fail;
4304 Inst.addOperand(MCOperand::CreateImm(align));
4307 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4308 return MCDisassembler::Fail;
4310 Inst.addOperand(MCOperand::CreateReg(0));
4313 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4314 return MCDisassembler::Fail;
4315 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4316 return MCDisassembler::Fail;
4317 Inst.addOperand(MCOperand::CreateImm(index));
4323 static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn,
4324 uint64_t Address, const void *Decoder) {
4325 DecodeStatus S = MCDisassembler::Success;
4327 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4328 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4329 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4330 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4331 unsigned size = fieldFromInstruction(Insn, 10, 2);
4338 return MCDisassembler::Fail;
4340 if (fieldFromInstruction(Insn, 4, 1))
4341 return MCDisassembler::Fail; // UNDEFINED
4342 index = fieldFromInstruction(Insn, 5, 3);
4345 if (fieldFromInstruction(Insn, 4, 1))
4346 return MCDisassembler::Fail; // UNDEFINED
4347 index = fieldFromInstruction(Insn, 6, 2);
4348 if (fieldFromInstruction(Insn, 5, 1))
4352 if (fieldFromInstruction(Insn, 4, 2))
4353 return MCDisassembler::Fail; // UNDEFINED
4354 index = fieldFromInstruction(Insn, 7, 1);
4355 if (fieldFromInstruction(Insn, 6, 1))
4360 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4361 return MCDisassembler::Fail;
4362 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4363 return MCDisassembler::Fail;
4364 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4365 return MCDisassembler::Fail;
4367 if (Rm != 0xF) { // Writeback
4368 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4369 return MCDisassembler::Fail;
4371 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4372 return MCDisassembler::Fail;
4373 Inst.addOperand(MCOperand::CreateImm(align));
4376 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4377 return MCDisassembler::Fail;
4379 Inst.addOperand(MCOperand::CreateReg(0));
4382 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4383 return MCDisassembler::Fail;
4384 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4385 return MCDisassembler::Fail;
4386 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4387 return MCDisassembler::Fail;
4388 Inst.addOperand(MCOperand::CreateImm(index));
4393 static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn,
4394 uint64_t Address, const void *Decoder) {
4395 DecodeStatus S = MCDisassembler::Success;
4397 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4398 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4399 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4400 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4401 unsigned size = fieldFromInstruction(Insn, 10, 2);
4408 return MCDisassembler::Fail;
4410 if (fieldFromInstruction(Insn, 4, 1))
4411 return MCDisassembler::Fail; // UNDEFINED
4412 index = fieldFromInstruction(Insn, 5, 3);
4415 if (fieldFromInstruction(Insn, 4, 1))
4416 return MCDisassembler::Fail; // UNDEFINED
4417 index = fieldFromInstruction(Insn, 6, 2);
4418 if (fieldFromInstruction(Insn, 5, 1))
4422 if (fieldFromInstruction(Insn, 4, 2))
4423 return MCDisassembler::Fail; // UNDEFINED
4424 index = fieldFromInstruction(Insn, 7, 1);
4425 if (fieldFromInstruction(Insn, 6, 1))
4430 if (Rm != 0xF) { // Writeback
4431 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4432 return MCDisassembler::Fail;
4434 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4435 return MCDisassembler::Fail;
4436 Inst.addOperand(MCOperand::CreateImm(align));
4439 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4440 return MCDisassembler::Fail;
4442 Inst.addOperand(MCOperand::CreateReg(0));
4445 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4446 return MCDisassembler::Fail;
4447 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4448 return MCDisassembler::Fail;
4449 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4450 return MCDisassembler::Fail;
4451 Inst.addOperand(MCOperand::CreateImm(index));
4457 static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn,
4458 uint64_t Address, const void *Decoder) {
4459 DecodeStatus S = MCDisassembler::Success;
4461 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4462 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4463 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4464 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4465 unsigned size = fieldFromInstruction(Insn, 10, 2);
4472 return MCDisassembler::Fail;
4474 if (fieldFromInstruction(Insn, 4, 1))
4476 index = fieldFromInstruction(Insn, 5, 3);
4479 if (fieldFromInstruction(Insn, 4, 1))
4481 index = fieldFromInstruction(Insn, 6, 2);
4482 if (fieldFromInstruction(Insn, 5, 1))
4486 switch (fieldFromInstruction(Insn, 4, 2)) {
4490 return MCDisassembler::Fail;
4492 align = 4 << fieldFromInstruction(Insn, 4, 2); break;
4495 index = fieldFromInstruction(Insn, 7, 1);
4496 if (fieldFromInstruction(Insn, 6, 1))
4501 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4502 return MCDisassembler::Fail;
4503 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4504 return MCDisassembler::Fail;
4505 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4506 return MCDisassembler::Fail;
4507 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder)))
4508 return MCDisassembler::Fail;
4510 if (Rm != 0xF) { // Writeback
4511 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4512 return MCDisassembler::Fail;
4514 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4515 return MCDisassembler::Fail;
4516 Inst.addOperand(MCOperand::CreateImm(align));
4519 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4520 return MCDisassembler::Fail;
4522 Inst.addOperand(MCOperand::CreateReg(0));
4525 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4526 return MCDisassembler::Fail;
4527 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4528 return MCDisassembler::Fail;
4529 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4530 return MCDisassembler::Fail;
4531 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder)))
4532 return MCDisassembler::Fail;
4533 Inst.addOperand(MCOperand::CreateImm(index));
4538 static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn,
4539 uint64_t Address, const void *Decoder) {
4540 DecodeStatus S = MCDisassembler::Success;
4542 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4543 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4544 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4545 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4546 unsigned size = fieldFromInstruction(Insn, 10, 2);
4553 return MCDisassembler::Fail;
4555 if (fieldFromInstruction(Insn, 4, 1))
4557 index = fieldFromInstruction(Insn, 5, 3);
4560 if (fieldFromInstruction(Insn, 4, 1))
4562 index = fieldFromInstruction(Insn, 6, 2);
4563 if (fieldFromInstruction(Insn, 5, 1))
4567 switch (fieldFromInstruction(Insn, 4, 2)) {
4571 return MCDisassembler::Fail;
4573 align = 4 << fieldFromInstruction(Insn, 4, 2); break;
4576 index = fieldFromInstruction(Insn, 7, 1);
4577 if (fieldFromInstruction(Insn, 6, 1))
4582 if (Rm != 0xF) { // Writeback
4583 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4584 return MCDisassembler::Fail;
4586 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4587 return MCDisassembler::Fail;
4588 Inst.addOperand(MCOperand::CreateImm(align));
4591 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4592 return MCDisassembler::Fail;
4594 Inst.addOperand(MCOperand::CreateReg(0));
4597 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4598 return MCDisassembler::Fail;
4599 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4600 return MCDisassembler::Fail;
4601 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4602 return MCDisassembler::Fail;
4603 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder)))
4604 return MCDisassembler::Fail;
4605 Inst.addOperand(MCOperand::CreateImm(index));
4610 static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn,
4611 uint64_t Address, const void *Decoder) {
4612 DecodeStatus S = MCDisassembler::Success;
4613 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4614 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
4615 unsigned Rm = fieldFromInstruction(Insn, 5, 1);
4616 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4617 Rm |= fieldFromInstruction(Insn, 0, 4) << 1;
4619 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F)
4620 S = MCDisassembler::SoftFail;
4622 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder)))
4623 return MCDisassembler::Fail;
4624 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder)))
4625 return MCDisassembler::Fail;
4626 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder)))
4627 return MCDisassembler::Fail;
4628 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder)))
4629 return MCDisassembler::Fail;
4630 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4631 return MCDisassembler::Fail;
4636 static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn,
4637 uint64_t Address, const void *Decoder) {
4638 DecodeStatus S = MCDisassembler::Success;
4639 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4640 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
4641 unsigned Rm = fieldFromInstruction(Insn, 5, 1);
4642 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4643 Rm |= fieldFromInstruction(Insn, 0, 4) << 1;
4645 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F)
4646 S = MCDisassembler::SoftFail;
4648 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder)))
4649 return MCDisassembler::Fail;
4650 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder)))
4651 return MCDisassembler::Fail;
4652 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder)))
4653 return MCDisassembler::Fail;
4654 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder)))
4655 return MCDisassembler::Fail;
4656 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4657 return MCDisassembler::Fail;
4662 static DecodeStatus DecodeIT(MCInst &Inst, unsigned Insn,
4663 uint64_t Address, const void *Decoder) {
4664 DecodeStatus S = MCDisassembler::Success;
4665 unsigned pred = fieldFromInstruction(Insn, 4, 4);
4666 unsigned mask = fieldFromInstruction(Insn, 0, 4);
4670 S = MCDisassembler::SoftFail;
4674 return MCDisassembler::Fail;
4676 Inst.addOperand(MCOperand::CreateImm(pred));
4677 Inst.addOperand(MCOperand::CreateImm(mask));
4682 DecodeT2LDRDPreInstruction(MCInst &Inst, unsigned Insn,
4683 uint64_t Address, const void *Decoder) {
4684 DecodeStatus S = MCDisassembler::Success;
4686 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4687 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4);
4688 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4689 unsigned addr = fieldFromInstruction(Insn, 0, 8);
4690 unsigned W = fieldFromInstruction(Insn, 21, 1);
4691 unsigned U = fieldFromInstruction(Insn, 23, 1);
4692 unsigned P = fieldFromInstruction(Insn, 24, 1);
4693 bool writeback = (W == 1) | (P == 0);
4695 addr |= (U << 8) | (Rn << 9);
4697 if (writeback && (Rn == Rt || Rn == Rt2))
4698 Check(S, MCDisassembler::SoftFail);
4700 Check(S, MCDisassembler::SoftFail);
4703 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
4704 return MCDisassembler::Fail;
4706 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder)))
4707 return MCDisassembler::Fail;
4708 // Writeback operand
4709 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
4710 return MCDisassembler::Fail;
4712 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder)))
4713 return MCDisassembler::Fail;
4719 DecodeT2STRDPreInstruction(MCInst &Inst, unsigned Insn,
4720 uint64_t Address, const void *Decoder) {
4721 DecodeStatus S = MCDisassembler::Success;
4723 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4724 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4);
4725 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4726 unsigned addr = fieldFromInstruction(Insn, 0, 8);
4727 unsigned W = fieldFromInstruction(Insn, 21, 1);
4728 unsigned U = fieldFromInstruction(Insn, 23, 1);
4729 unsigned P = fieldFromInstruction(Insn, 24, 1);
4730 bool writeback = (W == 1) | (P == 0);
4732 addr |= (U << 8) | (Rn << 9);
4734 if (writeback && (Rn == Rt || Rn == Rt2))
4735 Check(S, MCDisassembler::SoftFail);
4737 // Writeback operand
4738 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
4739 return MCDisassembler::Fail;
4741 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
4742 return MCDisassembler::Fail;
4744 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder)))
4745 return MCDisassembler::Fail;
4747 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder)))
4748 return MCDisassembler::Fail;
4753 static DecodeStatus DecodeT2Adr(MCInst &Inst, uint32_t Insn,
4754 uint64_t Address, const void *Decoder) {
4755 unsigned sign1 = fieldFromInstruction(Insn, 21, 1);
4756 unsigned sign2 = fieldFromInstruction(Insn, 23, 1);
4757 if (sign1 != sign2) return MCDisassembler::Fail;
4759 unsigned Val = fieldFromInstruction(Insn, 0, 8);
4760 Val |= fieldFromInstruction(Insn, 12, 3) << 8;
4761 Val |= fieldFromInstruction(Insn, 26, 1) << 11;
4763 Inst.addOperand(MCOperand::CreateImm(SignExtend32<13>(Val)));
4765 return MCDisassembler::Success;
4768 static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, uint32_t Val,
4770 const void *Decoder) {
4771 DecodeStatus S = MCDisassembler::Success;
4773 // Shift of "asr #32" is not allowed in Thumb2 mode.
4774 if (Val == 0x20) S = MCDisassembler::SoftFail;
4775 Inst.addOperand(MCOperand::CreateImm(Val));
4779 static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn,
4780 uint64_t Address, const void *Decoder) {
4781 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4782 unsigned Rt2 = fieldFromInstruction(Insn, 0, 4);
4783 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4784 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4787 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
4789 DecodeStatus S = MCDisassembler::Success;
4791 if (Rt == Rn || Rn == Rt2)
4792 S = MCDisassembler::SoftFail;
4794 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
4795 return MCDisassembler::Fail;
4796 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder)))
4797 return MCDisassembler::Fail;
4798 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4799 return MCDisassembler::Fail;
4800 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4801 return MCDisassembler::Fail;
4806 static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn,
4807 uint64_t Address, const void *Decoder) {
4808 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0);
4809 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4);
4810 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0);
4811 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4);
4812 unsigned imm = fieldFromInstruction(Insn, 16, 6);
4813 unsigned cmode = fieldFromInstruction(Insn, 8, 4);
4814 unsigned op = fieldFromInstruction(Insn, 5, 1);
4816 DecodeStatus S = MCDisassembler::Success;
4818 // VMOVv2f32 is ambiguous with these decodings.
4819 if (!(imm & 0x38) && cmode == 0xF) {
4820 if (op == 1) return MCDisassembler::Fail;
4821 Inst.setOpcode(ARM::VMOVv2f32);
4822 return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder);
4825 if (!(imm & 0x20)) return MCDisassembler::Fail;
4827 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
4828 return MCDisassembler::Fail;
4829 if (!Check(S, DecodeDPRRegisterClass(Inst, Vm, Address, Decoder)))
4830 return MCDisassembler::Fail;
4831 Inst.addOperand(MCOperand::CreateImm(64 - imm));
4836 static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn,
4837 uint64_t Address, const void *Decoder) {
4838 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0);
4839 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4);
4840 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0);
4841 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4);
4842 unsigned imm = fieldFromInstruction(Insn, 16, 6);
4843 unsigned cmode = fieldFromInstruction(Insn, 8, 4);
4844 unsigned op = fieldFromInstruction(Insn, 5, 1);
4846 DecodeStatus S = MCDisassembler::Success;
4848 // VMOVv4f32 is ambiguous with these decodings.
4849 if (!(imm & 0x38) && cmode == 0xF) {
4850 if (op == 1) return MCDisassembler::Fail;
4851 Inst.setOpcode(ARM::VMOVv4f32);
4852 return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder);
4855 if (!(imm & 0x20)) return MCDisassembler::Fail;
4857 if (!Check(S, DecodeQPRRegisterClass(Inst, Vd, Address, Decoder)))
4858 return MCDisassembler::Fail;
4859 if (!Check(S, DecodeQPRRegisterClass(Inst, Vm, Address, Decoder)))
4860 return MCDisassembler::Fail;
4861 Inst.addOperand(MCOperand::CreateImm(64 - imm));
4866 static DecodeStatus DecodeImm0_4(MCInst &Inst, unsigned Insn, uint64_t Address,
4867 const void *Decoder)
4869 unsigned Imm = fieldFromInstruction(Insn, 0, 3);
4870 if (Imm > 4) return MCDisassembler::Fail;
4871 Inst.addOperand(MCOperand::CreateImm(Imm));
4872 return MCDisassembler::Success;
4875 static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val,
4876 uint64_t Address, const void *Decoder) {
4877 DecodeStatus S = MCDisassembler::Success;
4879 unsigned Rn = fieldFromInstruction(Val, 16, 4);
4880 unsigned Rt = fieldFromInstruction(Val, 12, 4);
4881 unsigned Rm = fieldFromInstruction(Val, 0, 4);
4882 Rm |= (fieldFromInstruction(Val, 23, 1) << 4);
4883 unsigned Cond = fieldFromInstruction(Val, 28, 4);
4885 if (fieldFromInstruction(Val, 8, 4) != 0 || Rn == Rt)
4886 S = MCDisassembler::SoftFail;
4888 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
4889 return MCDisassembler::Fail;
4890 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4891 return MCDisassembler::Fail;
4892 if (!Check(S, DecodeAddrMode7Operand(Inst, Rn, Address, Decoder)))
4893 return MCDisassembler::Fail;
4894 if (!Check(S, DecodePostIdxReg(Inst, Rm, Address, Decoder)))
4895 return MCDisassembler::Fail;
4896 if (!Check(S, DecodePredicateOperand(Inst, Cond, Address, Decoder)))
4897 return MCDisassembler::Fail;
4902 static DecodeStatus DecodeMRRC2(llvm::MCInst &Inst, unsigned Val,
4903 uint64_t Address, const void *Decoder) {
4905 DecodeStatus S = MCDisassembler::Success;
4907 unsigned CRm = fieldFromInstruction(Val, 0, 4);
4908 unsigned opc1 = fieldFromInstruction(Val, 4, 4);
4909 unsigned cop = fieldFromInstruction(Val, 8, 4);
4910 unsigned Rt = fieldFromInstruction(Val, 12, 4);
4911 unsigned Rt2 = fieldFromInstruction(Val, 16, 4);
4913 if ((cop & ~0x1) == 0xa)
4914 return MCDisassembler::Fail;
4917 S = MCDisassembler::SoftFail;
4919 Inst.addOperand(MCOperand::CreateImm(cop));
4920 Inst.addOperand(MCOperand::CreateImm(opc1));
4921 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
4922 return MCDisassembler::Fail;
4923 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder)))
4924 return MCDisassembler::Fail;
4925 Inst.addOperand(MCOperand::CreateImm(CRm));