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);
328 static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
329 uint64_t Address, const void *Decoder);
330 static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
331 uint64_t Address, const void *Decoder);
332 static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
333 uint64_t Address, const void *Decoder);
334 static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
335 uint64_t Address, const void *Decoder);
336 static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
337 uint64_t Address, const void *Decoder);
338 static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
339 uint64_t Address, const void *Decoder);
340 static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
341 uint64_t Address, const void *Decoder);
342 static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
343 uint64_t Address, const void *Decoder);
344 static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
345 uint64_t Address, const void *Decoder);
346 static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Val,
347 uint64_t Address, const void *Decoder);
348 static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
349 uint64_t Address, const void* Decoder);
350 static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
351 uint64_t Address, const void* Decoder);
352 static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn,
353 uint64_t Address, const void* Decoder);
354 static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
355 uint64_t Address, const void* Decoder);
356 static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val,
357 uint64_t Address, const void *Decoder);
358 static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
359 uint64_t Address, const void *Decoder);
360 static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val,
361 uint64_t Address, const void *Decoder);
362 static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val,
363 uint64_t Address, const void *Decoder);
364 static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
365 uint64_t Address, const void *Decoder);
366 static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Val,
367 uint64_t Address, const void *Decoder);
368 static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
369 uint64_t Address, const void *Decoder);
370 static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn,
371 uint64_t Address, const void *Decoder);
372 static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
373 uint64_t Address, const void *Decoder);
374 static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Insn,
375 uint64_t Address, const void *Decoder);
376 static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
377 uint64_t Address, const void *Decoder);
378 static DecodeStatus DecodeThumbTableBranch(MCInst &Inst, unsigned Val,
379 uint64_t Address, const void *Decoder);
380 static DecodeStatus DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Val,
381 uint64_t Address, const void *Decoder);
382 static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val,
383 uint64_t Address, const void *Decoder);
384 static DecodeStatus DecodeThumbBCCTargetOperand(MCInst &Inst,unsigned Val,
385 uint64_t Address, const void *Decoder);
386 static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val,
387 uint64_t Address, const void *Decoder);
388 static DecodeStatus DecodeIT(MCInst &Inst, unsigned Val,
389 uint64_t Address, const void *Decoder);
390 static DecodeStatus DecodeT2LDRDPreInstruction(MCInst &Inst,unsigned Insn,
391 uint64_t Address, const void *Decoder);
392 static DecodeStatus DecodeT2STRDPreInstruction(MCInst &Inst,unsigned Insn,
393 uint64_t Address, const void *Decoder);
394 static DecodeStatus DecodeT2Adr(MCInst &Inst, unsigned Val,
395 uint64_t Address, const void *Decoder);
396 static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Val,
397 uint64_t Address, const void *Decoder);
398 static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, unsigned Val,
399 uint64_t Address, const void *Decoder);
401 static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val,
402 uint64_t Address, const void *Decoder);
403 static DecodeStatus DecodeMRRC2(llvm::MCInst &Inst, unsigned Val,
404 uint64_t Address, const void *Decoder);
405 #include "ARMGenDisassemblerTables.inc"
407 static MCDisassembler *createARMDisassembler(const Target &T, const MCSubtargetInfo &STI) {
408 return new ARMDisassembler(STI);
411 static MCDisassembler *createThumbDisassembler(const Target &T, const MCSubtargetInfo &STI) {
412 return new ThumbDisassembler(STI);
415 DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
416 const MemoryObject &Region,
419 raw_ostream &cs) const {
424 assert(!(STI.getFeatureBits() & ARM::ModeThumb) &&
425 "Asked to disassemble an ARM instruction but Subtarget is in Thumb mode!");
427 // We want to read exactly 4 bytes of data.
428 if (Region.readBytes(Address, 4, bytes) == -1) {
430 return MCDisassembler::Fail;
433 // Encoded as a small-endian 32-bit word in the stream.
434 uint32_t insn = (bytes[3] << 24) |
439 // Calling the auto-generated decoder function.
440 DecodeStatus result = decodeInstruction(DecoderTableARM32, MI, insn,
442 if (result != MCDisassembler::Fail) {
447 // VFP and NEON instructions, similarly, are shared between ARM
450 result = decodeInstruction(DecoderTableVFP32, MI, insn, Address, this, STI);
451 if (result != MCDisassembler::Fail) {
457 result = decodeInstruction(DecoderTableVFPV832, MI, insn, Address, this, STI);
458 if (result != MCDisassembler::Fail) {
464 result = decodeInstruction(DecoderTableNEONData32, MI, insn, Address,
466 if (result != MCDisassembler::Fail) {
468 // Add a fake predicate operand, because we share these instruction
469 // definitions with Thumb2 where these instructions are predicable.
470 if (!DecodePredicateOperand(MI, 0xE, Address, this))
471 return MCDisassembler::Fail;
476 result = decodeInstruction(DecoderTableNEONLoadStore32, MI, insn, Address,
478 if (result != MCDisassembler::Fail) {
480 // Add a fake predicate operand, because we share these instruction
481 // definitions with Thumb2 where these instructions are predicable.
482 if (!DecodePredicateOperand(MI, 0xE, Address, this))
483 return MCDisassembler::Fail;
488 result = decodeInstruction(DecoderTableNEONDup32, MI, insn, Address,
490 if (result != MCDisassembler::Fail) {
492 // Add a fake predicate operand, because we share these instruction
493 // definitions with Thumb2 where these instructions are predicable.
494 if (!DecodePredicateOperand(MI, 0xE, Address, this))
495 return MCDisassembler::Fail;
500 result = decodeInstruction(DecoderTablev8NEON32, MI, insn, Address,
502 if (result != MCDisassembler::Fail) {
508 result = decodeInstruction(DecoderTablev8Crypto32, MI, insn, Address,
510 if (result != MCDisassembler::Fail) {
517 return MCDisassembler::Fail;
521 extern const MCInstrDesc ARMInsts[];
524 /// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the
525 /// immediate Value in the MCInst. The immediate Value has had any PC
526 /// adjustment made by the caller. If the instruction is a branch instruction
527 /// then isBranch is true, else false. If the getOpInfo() function was set as
528 /// part of the setupForSymbolicDisassembly() call then that function is called
529 /// to get any symbolic information at the Address for this instruction. If
530 /// that returns non-zero then the symbolic information it returns is used to
531 /// create an MCExpr and that is added as an operand to the MCInst. If
532 /// getOpInfo() returns zero and isBranch is true then a symbol look up for
533 /// Value is done and if a symbol is found an MCExpr is created with that, else
534 /// an MCExpr with Value is created. This function returns true if it adds an
535 /// operand to the MCInst and false otherwise.
536 static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value,
537 bool isBranch, uint64_t InstSize,
538 MCInst &MI, const void *Decoder) {
539 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
540 // FIXME: Does it make sense for value to be negative?
541 return Dis->tryAddingSymbolicOperand(MI, (uint32_t)Value, Address, isBranch,
542 /* Offset */ 0, InstSize);
545 /// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being
546 /// referenced by a load instruction with the base register that is the Pc.
547 /// These can often be values in a literal pool near the Address of the
548 /// instruction. The Address of the instruction and its immediate Value are
549 /// used as a possible literal pool entry. The SymbolLookUp call back will
550 /// return the name of a symbol referenced by the literal pool's entry if
551 /// the referenced address is that of a symbol. Or it will return a pointer to
552 /// a literal 'C' string if the referenced address of the literal pool's entry
553 /// is an address into a section with 'C' string literals.
554 static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value,
555 const void *Decoder) {
556 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
557 Dis->tryAddingPcLoadReferenceComment(Value, Address);
560 // Thumb1 instructions don't have explicit S bits. Rather, they
561 // implicitly set CPSR. Since it's not represented in the encoding, the
562 // auto-generated decoder won't inject the CPSR operand. We need to fix
563 // that as a post-pass.
564 static void AddThumb1SBit(MCInst &MI, bool InITBlock) {
565 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
566 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
567 MCInst::iterator I = MI.begin();
568 for (unsigned i = 0; i < NumOps; ++i, ++I) {
569 if (I == MI.end()) break;
570 if (OpInfo[i].isOptionalDef() && OpInfo[i].RegClass == ARM::CCRRegClassID) {
571 if (i > 0 && OpInfo[i-1].isPredicate()) continue;
572 MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR));
577 MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR));
580 // Most Thumb instructions don't have explicit predicates in the
581 // encoding, but rather get their predicates from IT context. We need
582 // to fix up the predicate operands using this context information as a
584 MCDisassembler::DecodeStatus
585 ThumbDisassembler::AddThumbPredicate(MCInst &MI) const {
586 MCDisassembler::DecodeStatus S = Success;
588 // A few instructions actually have predicates encoded in them. Don't
589 // try to overwrite it if we're seeing one of those.
590 switch (MI.getOpcode()) {
601 // Some instructions (mostly conditional branches) are not
602 // allowed in IT blocks.
603 if (ITBlock.instrInITBlock())
612 // Some instructions (mostly unconditional branches) can
613 // only appears at the end of, or outside of, an IT.
614 if (ITBlock.instrInITBlock() && !ITBlock.instrLastInITBlock())
621 // If we're in an IT block, base the predicate on that. Otherwise,
622 // assume a predicate of AL.
624 CC = ITBlock.getITCC();
627 if (ITBlock.instrInITBlock())
628 ITBlock.advanceITState();
630 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
631 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
632 MCInst::iterator I = MI.begin();
633 for (unsigned i = 0; i < NumOps; ++i, ++I) {
634 if (I == MI.end()) break;
635 if (OpInfo[i].isPredicate()) {
636 I = MI.insert(I, MCOperand::CreateImm(CC));
639 MI.insert(I, MCOperand::CreateReg(0));
641 MI.insert(I, MCOperand::CreateReg(ARM::CPSR));
646 I = MI.insert(I, MCOperand::CreateImm(CC));
649 MI.insert(I, MCOperand::CreateReg(0));
651 MI.insert(I, MCOperand::CreateReg(ARM::CPSR));
656 // Thumb VFP instructions are a special case. Because we share their
657 // encodings between ARM and Thumb modes, and they are predicable in ARM
658 // mode, the auto-generated decoder will give them an (incorrect)
659 // predicate operand. We need to rewrite these operands based on the IT
660 // context as a post-pass.
661 void ThumbDisassembler::UpdateThumbVFPPredicate(MCInst &MI) const {
663 CC = ITBlock.getITCC();
664 if (ITBlock.instrInITBlock())
665 ITBlock.advanceITState();
667 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
668 MCInst::iterator I = MI.begin();
669 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
670 for (unsigned i = 0; i < NumOps; ++i, ++I) {
671 if (OpInfo[i].isPredicate() ) {
677 I->setReg(ARM::CPSR);
683 DecodeStatus ThumbDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
684 const MemoryObject &Region,
687 raw_ostream &cs) const {
692 assert((STI.getFeatureBits() & ARM::ModeThumb) &&
693 "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!");
695 // We want to read exactly 2 bytes of data.
696 if (Region.readBytes(Address, 2, bytes) == -1) {
698 return MCDisassembler::Fail;
701 uint16_t insn16 = (bytes[1] << 8) | bytes[0];
702 DecodeStatus result = decodeInstruction(DecoderTableThumb16, MI, insn16,
704 if (result != MCDisassembler::Fail) {
706 Check(result, AddThumbPredicate(MI));
711 result = decodeInstruction(DecoderTableThumbSBit16, MI, insn16,
715 bool InITBlock = ITBlock.instrInITBlock();
716 Check(result, AddThumbPredicate(MI));
717 AddThumb1SBit(MI, InITBlock);
722 result = decodeInstruction(DecoderTableThumb216, MI, insn16,
724 if (result != MCDisassembler::Fail) {
727 // Nested IT blocks are UNPREDICTABLE. Must be checked before we add
728 // the Thumb predicate.
729 if (MI.getOpcode() == ARM::t2IT && ITBlock.instrInITBlock())
730 result = MCDisassembler::SoftFail;
732 Check(result, AddThumbPredicate(MI));
734 // If we find an IT instruction, we need to parse its condition
735 // code and mask operands so that we can apply them correctly
736 // to the subsequent instructions.
737 if (MI.getOpcode() == ARM::t2IT) {
739 unsigned Firstcond = MI.getOperand(0).getImm();
740 unsigned Mask = MI.getOperand(1).getImm();
741 ITBlock.setITState(Firstcond, Mask);
747 // We want to read exactly 4 bytes of data.
748 if (Region.readBytes(Address, 4, bytes) == -1) {
750 return MCDisassembler::Fail;
753 uint32_t insn32 = (bytes[3] << 8) |
758 result = decodeInstruction(DecoderTableThumb32, MI, insn32, Address,
760 if (result != MCDisassembler::Fail) {
762 bool InITBlock = ITBlock.instrInITBlock();
763 Check(result, AddThumbPredicate(MI));
764 AddThumb1SBit(MI, InITBlock);
769 result = decodeInstruction(DecoderTableThumb232, MI, insn32, Address,
771 if (result != MCDisassembler::Fail) {
773 Check(result, AddThumbPredicate(MI));
777 if (fieldFromInstruction(insn32, 28, 4) == 0xE) {
779 result = decodeInstruction(DecoderTableVFP32, MI, insn32, Address, this, STI);
780 if (result != MCDisassembler::Fail) {
782 UpdateThumbVFPPredicate(MI);
788 result = decodeInstruction(DecoderTableVFPV832, MI, insn32, Address, this, STI);
789 if (result != MCDisassembler::Fail) {
794 if (fieldFromInstruction(insn32, 28, 4) == 0xE) {
796 result = decodeInstruction(DecoderTableNEONDup32, MI, insn32, Address,
798 if (result != MCDisassembler::Fail) {
800 Check(result, AddThumbPredicate(MI));
805 if (fieldFromInstruction(insn32, 24, 8) == 0xF9) {
807 uint32_t NEONLdStInsn = insn32;
808 NEONLdStInsn &= 0xF0FFFFFF;
809 NEONLdStInsn |= 0x04000000;
810 result = decodeInstruction(DecoderTableNEONLoadStore32, MI, NEONLdStInsn,
812 if (result != MCDisassembler::Fail) {
814 Check(result, AddThumbPredicate(MI));
819 if (fieldFromInstruction(insn32, 24, 4) == 0xF) {
821 uint32_t NEONDataInsn = insn32;
822 NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24
823 NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
824 NEONDataInsn |= 0x12000000; // Set bits 28 and 25
825 result = decodeInstruction(DecoderTableNEONData32, MI, NEONDataInsn,
827 if (result != MCDisassembler::Fail) {
829 Check(result, AddThumbPredicate(MI));
835 uint32_t NEONCryptoInsn = insn32;
836 NEONCryptoInsn &= 0xF0FFFFFF; // Clear bits 27-24
837 NEONCryptoInsn |= (NEONCryptoInsn & 0x10000000) >> 4; // Move bit 28 to bit 24
838 NEONCryptoInsn |= 0x12000000; // Set bits 28 and 25
839 result = decodeInstruction(DecoderTablev8Crypto32, MI, NEONCryptoInsn,
841 if (result != MCDisassembler::Fail) {
847 uint32_t NEONv8Insn = insn32;
848 NEONv8Insn &= 0xF3FFFFFF; // Clear bits 27-26
849 result = decodeInstruction(DecoderTablev8NEON32, MI, NEONv8Insn, Address,
851 if (result != MCDisassembler::Fail) {
858 return MCDisassembler::Fail;
862 extern "C" void LLVMInitializeARMDisassembler() {
863 TargetRegistry::RegisterMCDisassembler(TheARMTarget,
864 createARMDisassembler);
865 TargetRegistry::RegisterMCDisassembler(TheThumbTarget,
866 createThumbDisassembler);
869 static const uint16_t GPRDecoderTable[] = {
870 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
871 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
872 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
873 ARM::R12, ARM::SP, ARM::LR, ARM::PC
876 static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo,
877 uint64_t Address, const void *Decoder) {
879 return MCDisassembler::Fail;
881 unsigned Register = GPRDecoderTable[RegNo];
882 Inst.addOperand(MCOperand::CreateReg(Register));
883 return MCDisassembler::Success;
887 DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo,
888 uint64_t Address, const void *Decoder) {
889 DecodeStatus S = MCDisassembler::Success;
892 S = MCDisassembler::SoftFail;
894 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
900 DecodeGPRwithAPSRRegisterClass(MCInst &Inst, unsigned RegNo,
901 uint64_t Address, const void *Decoder) {
902 DecodeStatus S = MCDisassembler::Success;
906 Inst.addOperand(MCOperand::CreateReg(ARM::APSR_NZCV));
907 return MCDisassembler::Success;
910 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
914 static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo,
915 uint64_t Address, const void *Decoder) {
917 return MCDisassembler::Fail;
918 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder);
921 static const uint16_t GPRPairDecoderTable[] = {
922 ARM::R0_R1, ARM::R2_R3, ARM::R4_R5, ARM::R6_R7,
923 ARM::R8_R9, ARM::R10_R11, ARM::R12_SP
926 static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
927 uint64_t Address, const void *Decoder) {
928 DecodeStatus S = MCDisassembler::Success;
931 return MCDisassembler::Fail;
933 if ((RegNo & 1) || RegNo == 0xe)
934 S = MCDisassembler::SoftFail;
936 unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
937 Inst.addOperand(MCOperand::CreateReg(RegisterPair));
941 static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo,
942 uint64_t Address, const void *Decoder) {
943 unsigned Register = 0;
964 return MCDisassembler::Fail;
967 Inst.addOperand(MCOperand::CreateReg(Register));
968 return MCDisassembler::Success;
971 static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo,
972 uint64_t Address, const void *Decoder) {
973 DecodeStatus S = MCDisassembler::Success;
974 if (RegNo == 13 || RegNo == 15)
975 S = MCDisassembler::SoftFail;
976 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder));
980 static const uint16_t SPRDecoderTable[] = {
981 ARM::S0, ARM::S1, ARM::S2, ARM::S3,
982 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
983 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
984 ARM::S12, ARM::S13, ARM::S14, ARM::S15,
985 ARM::S16, ARM::S17, ARM::S18, ARM::S19,
986 ARM::S20, ARM::S21, ARM::S22, ARM::S23,
987 ARM::S24, ARM::S25, ARM::S26, ARM::S27,
988 ARM::S28, ARM::S29, ARM::S30, ARM::S31
991 static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo,
992 uint64_t Address, const void *Decoder) {
994 return MCDisassembler::Fail;
996 unsigned Register = SPRDecoderTable[RegNo];
997 Inst.addOperand(MCOperand::CreateReg(Register));
998 return MCDisassembler::Success;
1001 static const uint16_t DPRDecoderTable[] = {
1002 ARM::D0, ARM::D1, ARM::D2, ARM::D3,
1003 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
1004 ARM::D8, ARM::D9, ARM::D10, ARM::D11,
1005 ARM::D12, ARM::D13, ARM::D14, ARM::D15,
1006 ARM::D16, ARM::D17, ARM::D18, ARM::D19,
1007 ARM::D20, ARM::D21, ARM::D22, ARM::D23,
1008 ARM::D24, ARM::D25, ARM::D26, ARM::D27,
1009 ARM::D28, ARM::D29, ARM::D30, ARM::D31
1012 static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo,
1013 uint64_t Address, const void *Decoder) {
1015 return MCDisassembler::Fail;
1017 unsigned Register = DPRDecoderTable[RegNo];
1018 Inst.addOperand(MCOperand::CreateReg(Register));
1019 return MCDisassembler::Success;
1022 static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo,
1023 uint64_t Address, const void *Decoder) {
1025 return MCDisassembler::Fail;
1026 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1030 DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo,
1031 uint64_t Address, const void *Decoder) {
1033 return MCDisassembler::Fail;
1034 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder);
1037 static const uint16_t QPRDecoderTable[] = {
1038 ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3,
1039 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7,
1040 ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11,
1041 ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15
1045 static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo,
1046 uint64_t Address, const void *Decoder) {
1047 if (RegNo > 31 || (RegNo & 1) != 0)
1048 return MCDisassembler::Fail;
1051 unsigned Register = QPRDecoderTable[RegNo];
1052 Inst.addOperand(MCOperand::CreateReg(Register));
1053 return MCDisassembler::Success;
1056 static const uint16_t DPairDecoderTable[] = {
1057 ARM::Q0, ARM::D1_D2, ARM::Q1, ARM::D3_D4, ARM::Q2, ARM::D5_D6,
1058 ARM::Q3, ARM::D7_D8, ARM::Q4, ARM::D9_D10, ARM::Q5, ARM::D11_D12,
1059 ARM::Q6, ARM::D13_D14, ARM::Q7, ARM::D15_D16, ARM::Q8, ARM::D17_D18,
1060 ARM::Q9, ARM::D19_D20, ARM::Q10, ARM::D21_D22, ARM::Q11, ARM::D23_D24,
1061 ARM::Q12, ARM::D25_D26, ARM::Q13, ARM::D27_D28, ARM::Q14, ARM::D29_D30,
1065 static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo,
1066 uint64_t Address, const void *Decoder) {
1068 return MCDisassembler::Fail;
1070 unsigned Register = DPairDecoderTable[RegNo];
1071 Inst.addOperand(MCOperand::CreateReg(Register));
1072 return MCDisassembler::Success;
1075 static const uint16_t DPairSpacedDecoderTable[] = {
1076 ARM::D0_D2, ARM::D1_D3, ARM::D2_D4, ARM::D3_D5,
1077 ARM::D4_D6, ARM::D5_D7, ARM::D6_D8, ARM::D7_D9,
1078 ARM::D8_D10, ARM::D9_D11, ARM::D10_D12, ARM::D11_D13,
1079 ARM::D12_D14, ARM::D13_D15, ARM::D14_D16, ARM::D15_D17,
1080 ARM::D16_D18, ARM::D17_D19, ARM::D18_D20, ARM::D19_D21,
1081 ARM::D20_D22, ARM::D21_D23, ARM::D22_D24, ARM::D23_D25,
1082 ARM::D24_D26, ARM::D25_D27, ARM::D26_D28, ARM::D27_D29,
1083 ARM::D28_D30, ARM::D29_D31
1086 static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst &Inst,
1089 const void *Decoder) {
1091 return MCDisassembler::Fail;
1093 unsigned Register = DPairSpacedDecoderTable[RegNo];
1094 Inst.addOperand(MCOperand::CreateReg(Register));
1095 return MCDisassembler::Success;
1098 static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val,
1099 uint64_t Address, const void *Decoder) {
1100 if (Val == 0xF) return MCDisassembler::Fail;
1101 // AL predicate is not allowed on Thumb1 branches.
1102 if (Inst.getOpcode() == ARM::tBcc && Val == 0xE)
1103 return MCDisassembler::Fail;
1104 Inst.addOperand(MCOperand::CreateImm(Val));
1105 if (Val == ARMCC::AL) {
1106 Inst.addOperand(MCOperand::CreateReg(0));
1108 Inst.addOperand(MCOperand::CreateReg(ARM::CPSR));
1109 return MCDisassembler::Success;
1112 static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
1113 uint64_t Address, const void *Decoder) {
1115 Inst.addOperand(MCOperand::CreateReg(ARM::CPSR));
1117 Inst.addOperand(MCOperand::CreateReg(0));
1118 return MCDisassembler::Success;
1121 static DecodeStatus DecodeSOImmOperand(MCInst &Inst, unsigned Val,
1122 uint64_t Address, const void *Decoder) {
1123 uint32_t imm = Val & 0xFF;
1124 uint32_t rot = (Val & 0xF00) >> 7;
1125 uint32_t rot_imm = (imm >> rot) | (imm << ((32-rot) & 0x1F));
1126 Inst.addOperand(MCOperand::CreateImm(rot_imm));
1127 return MCDisassembler::Success;
1130 static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Val,
1131 uint64_t Address, const void *Decoder) {
1132 DecodeStatus S = MCDisassembler::Success;
1134 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1135 unsigned type = fieldFromInstruction(Val, 5, 2);
1136 unsigned imm = fieldFromInstruction(Val, 7, 5);
1138 // Register-immediate
1139 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
1140 return MCDisassembler::Fail;
1142 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1145 Shift = ARM_AM::lsl;
1148 Shift = ARM_AM::lsr;
1151 Shift = ARM_AM::asr;
1154 Shift = ARM_AM::ror;
1158 if (Shift == ARM_AM::ror && imm == 0)
1159 Shift = ARM_AM::rrx;
1161 unsigned Op = Shift | (imm << 3);
1162 Inst.addOperand(MCOperand::CreateImm(Op));
1167 static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Val,
1168 uint64_t Address, const void *Decoder) {
1169 DecodeStatus S = MCDisassembler::Success;
1171 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1172 unsigned type = fieldFromInstruction(Val, 5, 2);
1173 unsigned Rs = fieldFromInstruction(Val, 8, 4);
1175 // Register-register
1176 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1177 return MCDisassembler::Fail;
1178 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder)))
1179 return MCDisassembler::Fail;
1181 ARM_AM::ShiftOpc Shift = ARM_AM::lsl;
1184 Shift = ARM_AM::lsl;
1187 Shift = ARM_AM::lsr;
1190 Shift = ARM_AM::asr;
1193 Shift = ARM_AM::ror;
1197 Inst.addOperand(MCOperand::CreateImm(Shift));
1202 static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
1203 uint64_t Address, const void *Decoder) {
1204 DecodeStatus S = MCDisassembler::Success;
1206 bool writebackLoad = false;
1207 unsigned writebackReg = 0;
1208 switch (Inst.getOpcode()) {
1211 case ARM::LDMIA_UPD:
1212 case ARM::LDMDB_UPD:
1213 case ARM::LDMIB_UPD:
1214 case ARM::LDMDA_UPD:
1215 case ARM::t2LDMIA_UPD:
1216 case ARM::t2LDMDB_UPD:
1217 writebackLoad = true;
1218 writebackReg = Inst.getOperand(0).getReg();
1222 // Empty register lists are not allowed.
1223 if (Val == 0) return MCDisassembler::Fail;
1224 for (unsigned i = 0; i < 16; ++i) {
1225 if (Val & (1 << i)) {
1226 if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder)))
1227 return MCDisassembler::Fail;
1228 // Writeback not allowed if Rn is in the target list.
1229 if (writebackLoad && writebackReg == Inst.end()[-1].getReg())
1230 Check(S, MCDisassembler::SoftFail);
1237 static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
1238 uint64_t Address, const void *Decoder) {
1239 DecodeStatus S = MCDisassembler::Success;
1241 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1242 unsigned regs = fieldFromInstruction(Val, 0, 8);
1244 // In case of unpredictable encoding, tweak the operands.
1245 if (regs == 0 || (Vd + regs) > 32) {
1246 regs = Vd + regs > 32 ? 32 - Vd : regs;
1247 regs = std::max( 1u, regs);
1248 S = MCDisassembler::SoftFail;
1251 if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder)))
1252 return MCDisassembler::Fail;
1253 for (unsigned i = 0; i < (regs - 1); ++i) {
1254 if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1255 return MCDisassembler::Fail;
1261 static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val,
1262 uint64_t Address, const void *Decoder) {
1263 DecodeStatus S = MCDisassembler::Success;
1265 unsigned Vd = fieldFromInstruction(Val, 8, 5);
1266 unsigned regs = fieldFromInstruction(Val, 1, 7);
1268 // In case of unpredictable encoding, tweak the operands.
1269 if (regs == 0 || regs > 16 || (Vd + regs) > 32) {
1270 regs = Vd + regs > 32 ? 32 - Vd : regs;
1271 regs = std::max( 1u, regs);
1272 regs = std::min(16u, regs);
1273 S = MCDisassembler::SoftFail;
1276 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
1277 return MCDisassembler::Fail;
1278 for (unsigned i = 0; i < (regs - 1); ++i) {
1279 if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder)))
1280 return MCDisassembler::Fail;
1286 static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Val,
1287 uint64_t Address, const void *Decoder) {
1288 // This operand encodes a mask of contiguous zeros between a specified MSB
1289 // and LSB. To decode it, we create the mask of all bits MSB-and-lower,
1290 // the mask of all bits LSB-and-lower, and then xor them to create
1291 // the mask of that's all ones on [msb, lsb]. Finally we not it to
1292 // create the final mask.
1293 unsigned msb = fieldFromInstruction(Val, 5, 5);
1294 unsigned lsb = fieldFromInstruction(Val, 0, 5);
1296 DecodeStatus S = MCDisassembler::Success;
1298 Check(S, MCDisassembler::SoftFail);
1299 // The check above will cause the warning for the "potentially undefined
1300 // instruction encoding" but we can't build a bad MCOperand value here
1301 // with a lsb > msb or else printing the MCInst will cause a crash.
1305 uint32_t msb_mask = 0xFFFFFFFF;
1306 if (msb != 31) msb_mask = (1U << (msb+1)) - 1;
1307 uint32_t lsb_mask = (1U << lsb) - 1;
1309 Inst.addOperand(MCOperand::CreateImm(~(msb_mask ^ lsb_mask)));
1313 static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
1314 uint64_t Address, const void *Decoder) {
1315 DecodeStatus S = MCDisassembler::Success;
1317 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1318 unsigned CRd = fieldFromInstruction(Insn, 12, 4);
1319 unsigned coproc = fieldFromInstruction(Insn, 8, 4);
1320 unsigned imm = fieldFromInstruction(Insn, 0, 8);
1321 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1322 unsigned U = fieldFromInstruction(Insn, 23, 1);
1324 switch (Inst.getOpcode()) {
1325 case ARM::LDC_OFFSET:
1328 case ARM::LDC_OPTION:
1329 case ARM::LDCL_OFFSET:
1331 case ARM::LDCL_POST:
1332 case ARM::LDCL_OPTION:
1333 case ARM::STC_OFFSET:
1336 case ARM::STC_OPTION:
1337 case ARM::STCL_OFFSET:
1339 case ARM::STCL_POST:
1340 case ARM::STCL_OPTION:
1341 case ARM::t2LDC_OFFSET:
1342 case ARM::t2LDC_PRE:
1343 case ARM::t2LDC_POST:
1344 case ARM::t2LDC_OPTION:
1345 case ARM::t2LDCL_OFFSET:
1346 case ARM::t2LDCL_PRE:
1347 case ARM::t2LDCL_POST:
1348 case ARM::t2LDCL_OPTION:
1349 case ARM::t2STC_OFFSET:
1350 case ARM::t2STC_PRE:
1351 case ARM::t2STC_POST:
1352 case ARM::t2STC_OPTION:
1353 case ARM::t2STCL_OFFSET:
1354 case ARM::t2STCL_PRE:
1355 case ARM::t2STCL_POST:
1356 case ARM::t2STCL_OPTION:
1357 if (coproc == 0xA || coproc == 0xB)
1358 return MCDisassembler::Fail;
1364 Inst.addOperand(MCOperand::CreateImm(coproc));
1365 Inst.addOperand(MCOperand::CreateImm(CRd));
1366 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1367 return MCDisassembler::Fail;
1369 switch (Inst.getOpcode()) {
1370 case ARM::t2LDC2_OFFSET:
1371 case ARM::t2LDC2L_OFFSET:
1372 case ARM::t2LDC2_PRE:
1373 case ARM::t2LDC2L_PRE:
1374 case ARM::t2STC2_OFFSET:
1375 case ARM::t2STC2L_OFFSET:
1376 case ARM::t2STC2_PRE:
1377 case ARM::t2STC2L_PRE:
1378 case ARM::LDC2_OFFSET:
1379 case ARM::LDC2L_OFFSET:
1381 case ARM::LDC2L_PRE:
1382 case ARM::STC2_OFFSET:
1383 case ARM::STC2L_OFFSET:
1385 case ARM::STC2L_PRE:
1386 case ARM::t2LDC_OFFSET:
1387 case ARM::t2LDCL_OFFSET:
1388 case ARM::t2LDC_PRE:
1389 case ARM::t2LDCL_PRE:
1390 case ARM::t2STC_OFFSET:
1391 case ARM::t2STCL_OFFSET:
1392 case ARM::t2STC_PRE:
1393 case ARM::t2STCL_PRE:
1394 case ARM::LDC_OFFSET:
1395 case ARM::LDCL_OFFSET:
1398 case ARM::STC_OFFSET:
1399 case ARM::STCL_OFFSET:
1402 imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm);
1403 Inst.addOperand(MCOperand::CreateImm(imm));
1405 case ARM::t2LDC2_POST:
1406 case ARM::t2LDC2L_POST:
1407 case ARM::t2STC2_POST:
1408 case ARM::t2STC2L_POST:
1409 case ARM::LDC2_POST:
1410 case ARM::LDC2L_POST:
1411 case ARM::STC2_POST:
1412 case ARM::STC2L_POST:
1413 case ARM::t2LDC_POST:
1414 case ARM::t2LDCL_POST:
1415 case ARM::t2STC_POST:
1416 case ARM::t2STCL_POST:
1418 case ARM::LDCL_POST:
1420 case ARM::STCL_POST:
1424 // The 'option' variant doesn't encode 'U' in the immediate since
1425 // the immediate is unsigned [0,255].
1426 Inst.addOperand(MCOperand::CreateImm(imm));
1430 switch (Inst.getOpcode()) {
1431 case ARM::LDC_OFFSET:
1434 case ARM::LDC_OPTION:
1435 case ARM::LDCL_OFFSET:
1437 case ARM::LDCL_POST:
1438 case ARM::LDCL_OPTION:
1439 case ARM::STC_OFFSET:
1442 case ARM::STC_OPTION:
1443 case ARM::STCL_OFFSET:
1445 case ARM::STCL_POST:
1446 case ARM::STCL_OPTION:
1447 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1448 return MCDisassembler::Fail;
1458 DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn,
1459 uint64_t Address, const void *Decoder) {
1460 DecodeStatus S = MCDisassembler::Success;
1462 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1463 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
1464 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
1465 unsigned imm = fieldFromInstruction(Insn, 0, 12);
1466 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1467 unsigned reg = fieldFromInstruction(Insn, 25, 1);
1468 unsigned P = fieldFromInstruction(Insn, 24, 1);
1469 unsigned W = fieldFromInstruction(Insn, 21, 1);
1471 // On stores, the writeback operand precedes Rt.
1472 switch (Inst.getOpcode()) {
1473 case ARM::STR_POST_IMM:
1474 case ARM::STR_POST_REG:
1475 case ARM::STRB_POST_IMM:
1476 case ARM::STRB_POST_REG:
1477 case ARM::STRT_POST_REG:
1478 case ARM::STRT_POST_IMM:
1479 case ARM::STRBT_POST_REG:
1480 case ARM::STRBT_POST_IMM:
1481 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1482 return MCDisassembler::Fail;
1488 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
1489 return MCDisassembler::Fail;
1491 // On loads, the writeback operand comes after Rt.
1492 switch (Inst.getOpcode()) {
1493 case ARM::LDR_POST_IMM:
1494 case ARM::LDR_POST_REG:
1495 case ARM::LDRB_POST_IMM:
1496 case ARM::LDRB_POST_REG:
1497 case ARM::LDRBT_POST_REG:
1498 case ARM::LDRBT_POST_IMM:
1499 case ARM::LDRT_POST_REG:
1500 case ARM::LDRT_POST_IMM:
1501 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1502 return MCDisassembler::Fail;
1508 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1509 return MCDisassembler::Fail;
1511 ARM_AM::AddrOpc Op = ARM_AM::add;
1512 if (!fieldFromInstruction(Insn, 23, 1))
1515 bool writeback = (P == 0) || (W == 1);
1516 unsigned idx_mode = 0;
1518 idx_mode = ARMII::IndexModePre;
1519 else if (!P && writeback)
1520 idx_mode = ARMII::IndexModePost;
1522 if (writeback && (Rn == 15 || Rn == Rt))
1523 S = MCDisassembler::SoftFail; // UNPREDICTABLE
1526 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1527 return MCDisassembler::Fail;
1528 ARM_AM::ShiftOpc Opc = ARM_AM::lsl;
1529 switch( fieldFromInstruction(Insn, 5, 2)) {
1543 return MCDisassembler::Fail;
1545 unsigned amt = fieldFromInstruction(Insn, 7, 5);
1546 if (Opc == ARM_AM::ror && amt == 0)
1548 unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode);
1550 Inst.addOperand(MCOperand::CreateImm(imm));
1552 Inst.addOperand(MCOperand::CreateReg(0));
1553 unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode);
1554 Inst.addOperand(MCOperand::CreateImm(tmp));
1557 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1558 return MCDisassembler::Fail;
1563 static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Val,
1564 uint64_t Address, const void *Decoder) {
1565 DecodeStatus S = MCDisassembler::Success;
1567 unsigned Rn = fieldFromInstruction(Val, 13, 4);
1568 unsigned Rm = fieldFromInstruction(Val, 0, 4);
1569 unsigned type = fieldFromInstruction(Val, 5, 2);
1570 unsigned imm = fieldFromInstruction(Val, 7, 5);
1571 unsigned U = fieldFromInstruction(Val, 12, 1);
1573 ARM_AM::ShiftOpc ShOp = ARM_AM::lsl;
1589 if (ShOp == ARM_AM::ror && imm == 0)
1592 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1593 return MCDisassembler::Fail;
1594 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
1595 return MCDisassembler::Fail;
1598 shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp);
1600 shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp);
1601 Inst.addOperand(MCOperand::CreateImm(shift));
1607 DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn,
1608 uint64_t Address, const void *Decoder) {
1609 DecodeStatus S = MCDisassembler::Success;
1611 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
1612 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1613 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
1614 unsigned type = fieldFromInstruction(Insn, 22, 1);
1615 unsigned imm = fieldFromInstruction(Insn, 8, 4);
1616 unsigned U = ((~fieldFromInstruction(Insn, 23, 1)) & 1) << 8;
1617 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1618 unsigned W = fieldFromInstruction(Insn, 21, 1);
1619 unsigned P = fieldFromInstruction(Insn, 24, 1);
1620 unsigned Rt2 = Rt + 1;
1622 bool writeback = (W == 1) | (P == 0);
1624 // For {LD,ST}RD, Rt must be even, else undefined.
1625 switch (Inst.getOpcode()) {
1628 case ARM::STRD_POST:
1631 case ARM::LDRD_POST:
1632 if (Rt & 0x1) S = MCDisassembler::SoftFail;
1637 switch (Inst.getOpcode()) {
1640 case ARM::STRD_POST:
1641 if (P == 0 && W == 1)
1642 S = MCDisassembler::SoftFail;
1644 if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2))
1645 S = MCDisassembler::SoftFail;
1646 if (type && Rm == 15)
1647 S = MCDisassembler::SoftFail;
1649 S = MCDisassembler::SoftFail;
1650 if (!type && fieldFromInstruction(Insn, 8, 4))
1651 S = MCDisassembler::SoftFail;
1655 case ARM::STRH_POST:
1657 S = MCDisassembler::SoftFail;
1658 if (writeback && (Rn == 15 || Rn == Rt))
1659 S = MCDisassembler::SoftFail;
1660 if (!type && Rm == 15)
1661 S = MCDisassembler::SoftFail;
1665 case ARM::LDRD_POST:
1666 if (type && Rn == 15){
1668 S = MCDisassembler::SoftFail;
1671 if (P == 0 && W == 1)
1672 S = MCDisassembler::SoftFail;
1673 if (!type && (Rt2 == 15 || Rm == 15 || Rm == Rt || Rm == Rt2))
1674 S = MCDisassembler::SoftFail;
1675 if (!type && writeback && Rn == 15)
1676 S = MCDisassembler::SoftFail;
1677 if (writeback && (Rn == Rt || Rn == Rt2))
1678 S = MCDisassembler::SoftFail;
1682 case ARM::LDRH_POST:
1683 if (type && Rn == 15){
1685 S = MCDisassembler::SoftFail;
1689 S = MCDisassembler::SoftFail;
1690 if (!type && Rm == 15)
1691 S = MCDisassembler::SoftFail;
1692 if (!type && writeback && (Rn == 15 || Rn == Rt))
1693 S = MCDisassembler::SoftFail;
1696 case ARM::LDRSH_PRE:
1697 case ARM::LDRSH_POST:
1699 case ARM::LDRSB_PRE:
1700 case ARM::LDRSB_POST:
1701 if (type && Rn == 15){
1703 S = MCDisassembler::SoftFail;
1706 if (type && (Rt == 15 || (writeback && Rn == Rt)))
1707 S = MCDisassembler::SoftFail;
1708 if (!type && (Rt == 15 || Rm == 15))
1709 S = MCDisassembler::SoftFail;
1710 if (!type && writeback && (Rn == 15 || Rn == Rt))
1711 S = MCDisassembler::SoftFail;
1717 if (writeback) { // Writeback
1719 U |= ARMII::IndexModePre << 9;
1721 U |= ARMII::IndexModePost << 9;
1723 // On stores, the writeback operand precedes Rt.
1724 switch (Inst.getOpcode()) {
1727 case ARM::STRD_POST:
1730 case ARM::STRH_POST:
1731 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1732 return MCDisassembler::Fail;
1739 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
1740 return MCDisassembler::Fail;
1741 switch (Inst.getOpcode()) {
1744 case ARM::STRD_POST:
1747 case ARM::LDRD_POST:
1748 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder)))
1749 return MCDisassembler::Fail;
1756 // On loads, the writeback operand comes after Rt.
1757 switch (Inst.getOpcode()) {
1760 case ARM::LDRD_POST:
1763 case ARM::LDRH_POST:
1765 case ARM::LDRSH_PRE:
1766 case ARM::LDRSH_POST:
1768 case ARM::LDRSB_PRE:
1769 case ARM::LDRSB_POST:
1772 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1773 return MCDisassembler::Fail;
1780 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1781 return MCDisassembler::Fail;
1784 Inst.addOperand(MCOperand::CreateReg(0));
1785 Inst.addOperand(MCOperand::CreateImm(U | (imm << 4) | Rm));
1787 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
1788 return MCDisassembler::Fail;
1789 Inst.addOperand(MCOperand::CreateImm(U));
1792 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1793 return MCDisassembler::Fail;
1798 static DecodeStatus DecodeRFEInstruction(MCInst &Inst, unsigned Insn,
1799 uint64_t Address, const void *Decoder) {
1800 DecodeStatus S = MCDisassembler::Success;
1802 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1803 unsigned mode = fieldFromInstruction(Insn, 23, 2);
1820 Inst.addOperand(MCOperand::CreateImm(mode));
1821 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1822 return MCDisassembler::Fail;
1827 static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn,
1828 uint64_t Address, const void *Decoder) {
1829 DecodeStatus S = MCDisassembler::Success;
1831 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
1832 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
1833 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1834 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1837 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
1839 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
1840 return MCDisassembler::Fail;
1841 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
1842 return MCDisassembler::Fail;
1843 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
1844 return MCDisassembler::Fail;
1845 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1846 return MCDisassembler::Fail;
1850 static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst &Inst,
1852 uint64_t Address, const void *Decoder) {
1853 DecodeStatus S = MCDisassembler::Success;
1855 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
1856 unsigned pred = fieldFromInstruction(Insn, 28, 4);
1857 unsigned reglist = fieldFromInstruction(Insn, 0, 16);
1860 // Ambiguous with RFE and SRS
1861 switch (Inst.getOpcode()) {
1863 Inst.setOpcode(ARM::RFEDA);
1865 case ARM::LDMDA_UPD:
1866 Inst.setOpcode(ARM::RFEDA_UPD);
1869 Inst.setOpcode(ARM::RFEDB);
1871 case ARM::LDMDB_UPD:
1872 Inst.setOpcode(ARM::RFEDB_UPD);
1875 Inst.setOpcode(ARM::RFEIA);
1877 case ARM::LDMIA_UPD:
1878 Inst.setOpcode(ARM::RFEIA_UPD);
1881 Inst.setOpcode(ARM::RFEIB);
1883 case ARM::LDMIB_UPD:
1884 Inst.setOpcode(ARM::RFEIB_UPD);
1887 Inst.setOpcode(ARM::SRSDA);
1889 case ARM::STMDA_UPD:
1890 Inst.setOpcode(ARM::SRSDA_UPD);
1893 Inst.setOpcode(ARM::SRSDB);
1895 case ARM::STMDB_UPD:
1896 Inst.setOpcode(ARM::SRSDB_UPD);
1899 Inst.setOpcode(ARM::SRSIA);
1901 case ARM::STMIA_UPD:
1902 Inst.setOpcode(ARM::SRSIA_UPD);
1905 Inst.setOpcode(ARM::SRSIB);
1907 case ARM::STMIB_UPD:
1908 Inst.setOpcode(ARM::SRSIB_UPD);
1911 return MCDisassembler::Fail;
1914 // For stores (which become SRS's, the only operand is the mode.
1915 if (fieldFromInstruction(Insn, 20, 1) == 0) {
1916 // Check SRS encoding constraints
1917 if (!(fieldFromInstruction(Insn, 22, 1) == 1 &&
1918 fieldFromInstruction(Insn, 20, 1) == 0))
1919 return MCDisassembler::Fail;
1922 MCOperand::CreateImm(fieldFromInstruction(Insn, 0, 4)));
1926 return DecodeRFEInstruction(Inst, Insn, Address, Decoder);
1929 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1930 return MCDisassembler::Fail;
1931 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
1932 return MCDisassembler::Fail; // Tied
1933 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
1934 return MCDisassembler::Fail;
1935 if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder)))
1936 return MCDisassembler::Fail;
1941 static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn,
1942 uint64_t Address, const void *Decoder) {
1943 unsigned imod = fieldFromInstruction(Insn, 18, 2);
1944 unsigned M = fieldFromInstruction(Insn, 17, 1);
1945 unsigned iflags = fieldFromInstruction(Insn, 6, 3);
1946 unsigned mode = fieldFromInstruction(Insn, 0, 5);
1948 DecodeStatus S = MCDisassembler::Success;
1950 // This decoder is called from multiple location that do not check
1951 // the full encoding is valid before they do.
1952 if (fieldFromInstruction(Insn, 5, 1) != 0 ||
1953 fieldFromInstruction(Insn, 16, 1) != 0 ||
1954 fieldFromInstruction(Insn, 20, 8) != 0x10)
1955 return MCDisassembler::Fail;
1957 // imod == '01' --> UNPREDICTABLE
1958 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
1959 // return failure here. The '01' imod value is unprintable, so there's
1960 // nothing useful we could do even if we returned UNPREDICTABLE.
1962 if (imod == 1) return MCDisassembler::Fail;
1965 Inst.setOpcode(ARM::CPS3p);
1966 Inst.addOperand(MCOperand::CreateImm(imod));
1967 Inst.addOperand(MCOperand::CreateImm(iflags));
1968 Inst.addOperand(MCOperand::CreateImm(mode));
1969 } else if (imod && !M) {
1970 Inst.setOpcode(ARM::CPS2p);
1971 Inst.addOperand(MCOperand::CreateImm(imod));
1972 Inst.addOperand(MCOperand::CreateImm(iflags));
1973 if (mode) S = MCDisassembler::SoftFail;
1974 } else if (!imod && M) {
1975 Inst.setOpcode(ARM::CPS1p);
1976 Inst.addOperand(MCOperand::CreateImm(mode));
1977 if (iflags) S = MCDisassembler::SoftFail;
1979 // imod == '00' && M == '0' --> UNPREDICTABLE
1980 Inst.setOpcode(ARM::CPS1p);
1981 Inst.addOperand(MCOperand::CreateImm(mode));
1982 S = MCDisassembler::SoftFail;
1988 static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
1989 uint64_t Address, const void *Decoder) {
1990 unsigned imod = fieldFromInstruction(Insn, 9, 2);
1991 unsigned M = fieldFromInstruction(Insn, 8, 1);
1992 unsigned iflags = fieldFromInstruction(Insn, 5, 3);
1993 unsigned mode = fieldFromInstruction(Insn, 0, 5);
1995 DecodeStatus S = MCDisassembler::Success;
1997 // imod == '01' --> UNPREDICTABLE
1998 // NOTE: Even though this is technically UNPREDICTABLE, we choose to
1999 // return failure here. The '01' imod value is unprintable, so there's
2000 // nothing useful we could do even if we returned UNPREDICTABLE.
2002 if (imod == 1) return MCDisassembler::Fail;
2005 Inst.setOpcode(ARM::t2CPS3p);
2006 Inst.addOperand(MCOperand::CreateImm(imod));
2007 Inst.addOperand(MCOperand::CreateImm(iflags));
2008 Inst.addOperand(MCOperand::CreateImm(mode));
2009 } else if (imod && !M) {
2010 Inst.setOpcode(ARM::t2CPS2p);
2011 Inst.addOperand(MCOperand::CreateImm(imod));
2012 Inst.addOperand(MCOperand::CreateImm(iflags));
2013 if (mode) S = MCDisassembler::SoftFail;
2014 } else if (!imod && M) {
2015 Inst.setOpcode(ARM::t2CPS1p);
2016 Inst.addOperand(MCOperand::CreateImm(mode));
2017 if (iflags) S = MCDisassembler::SoftFail;
2019 // imod == '00' && M == '0' --> this is a HINT instruction
2020 int imm = fieldFromInstruction(Insn, 0, 8);
2021 // HINT are defined only for immediate in [0..4]
2022 if(imm > 4) return MCDisassembler::Fail;
2023 Inst.setOpcode(ARM::t2HINT);
2024 Inst.addOperand(MCOperand::CreateImm(imm));
2030 static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
2031 uint64_t Address, const void *Decoder) {
2032 DecodeStatus S = MCDisassembler::Success;
2034 unsigned Rd = fieldFromInstruction(Insn, 8, 4);
2037 imm |= (fieldFromInstruction(Insn, 0, 8) << 0);
2038 imm |= (fieldFromInstruction(Insn, 12, 3) << 8);
2039 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2040 imm |= (fieldFromInstruction(Insn, 26, 1) << 11);
2042 if (Inst.getOpcode() == ARM::t2MOVTi16)
2043 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2044 return MCDisassembler::Fail;
2045 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
2046 return MCDisassembler::Fail;
2048 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2049 Inst.addOperand(MCOperand::CreateImm(imm));
2054 static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
2055 uint64_t Address, const void *Decoder) {
2056 DecodeStatus S = MCDisassembler::Success;
2058 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2059 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2062 imm |= (fieldFromInstruction(Insn, 0, 12) << 0);
2063 imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
2065 if (Inst.getOpcode() == ARM::MOVTi16)
2066 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2067 return MCDisassembler::Fail;
2069 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2070 return MCDisassembler::Fail;
2072 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
2073 Inst.addOperand(MCOperand::CreateImm(imm));
2075 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2076 return MCDisassembler::Fail;
2081 static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn,
2082 uint64_t Address, const void *Decoder) {
2083 DecodeStatus S = MCDisassembler::Success;
2085 unsigned Rd = fieldFromInstruction(Insn, 16, 4);
2086 unsigned Rn = fieldFromInstruction(Insn, 0, 4);
2087 unsigned Rm = fieldFromInstruction(Insn, 8, 4);
2088 unsigned Ra = fieldFromInstruction(Insn, 12, 4);
2089 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2092 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
2094 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
2095 return MCDisassembler::Fail;
2096 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
2097 return MCDisassembler::Fail;
2098 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
2099 return MCDisassembler::Fail;
2100 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder)))
2101 return MCDisassembler::Fail;
2103 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2104 return MCDisassembler::Fail;
2109 static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val,
2110 uint64_t Address, const void *Decoder) {
2111 DecodeStatus S = MCDisassembler::Success;
2113 unsigned add = fieldFromInstruction(Val, 12, 1);
2114 unsigned imm = fieldFromInstruction(Val, 0, 12);
2115 unsigned Rn = fieldFromInstruction(Val, 13, 4);
2117 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2118 return MCDisassembler::Fail;
2120 if (!add) imm *= -1;
2121 if (imm == 0 && !add) imm = INT32_MIN;
2122 Inst.addOperand(MCOperand::CreateImm(imm));
2124 tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder);
2129 static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val,
2130 uint64_t Address, const void *Decoder) {
2131 DecodeStatus S = MCDisassembler::Success;
2133 unsigned Rn = fieldFromInstruction(Val, 9, 4);
2134 unsigned U = fieldFromInstruction(Val, 8, 1);
2135 unsigned imm = fieldFromInstruction(Val, 0, 8);
2137 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2138 return MCDisassembler::Fail;
2141 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add, imm)));
2143 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm)));
2148 static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val,
2149 uint64_t Address, const void *Decoder) {
2150 return DecodeGPRRegisterClass(Inst, Val, Address, Decoder);
2154 DecodeT2BInstruction(MCInst &Inst, unsigned Insn,
2155 uint64_t Address, const void *Decoder) {
2156 DecodeStatus Status = MCDisassembler::Success;
2158 // Note the J1 and J2 values are from the encoded instruction. So here
2159 // change them to I1 and I2 values via as documented:
2160 // I1 = NOT(J1 EOR S);
2161 // I2 = NOT(J2 EOR S);
2162 // and build the imm32 with one trailing zero as documented:
2163 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
2164 unsigned S = fieldFromInstruction(Insn, 26, 1);
2165 unsigned J1 = fieldFromInstruction(Insn, 13, 1);
2166 unsigned J2 = fieldFromInstruction(Insn, 11, 1);
2167 unsigned I1 = !(J1 ^ S);
2168 unsigned I2 = !(J2 ^ S);
2169 unsigned imm10 = fieldFromInstruction(Insn, 16, 10);
2170 unsigned imm11 = fieldFromInstruction(Insn, 0, 11);
2171 unsigned tmp = (S << 23) | (I1 << 22) | (I2 << 21) | (imm10 << 11) | imm11;
2172 int imm32 = SignExtend32<25>(tmp << 1);
2173 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
2174 true, 4, Inst, Decoder))
2175 Inst.addOperand(MCOperand::CreateImm(imm32));
2181 DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn,
2182 uint64_t Address, const void *Decoder) {
2183 DecodeStatus S = MCDisassembler::Success;
2185 unsigned pred = fieldFromInstruction(Insn, 28, 4);
2186 unsigned imm = fieldFromInstruction(Insn, 0, 24) << 2;
2189 Inst.setOpcode(ARM::BLXi);
2190 imm |= fieldFromInstruction(Insn, 24, 1) << 1;
2191 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2192 true, 4, Inst, Decoder))
2193 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm)));
2197 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
2198 true, 4, Inst, Decoder))
2199 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm)));
2200 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
2201 return MCDisassembler::Fail;
2207 static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val,
2208 uint64_t Address, const void *Decoder) {
2209 DecodeStatus S = MCDisassembler::Success;
2211 unsigned Rm = fieldFromInstruction(Val, 0, 4);
2212 unsigned align = fieldFromInstruction(Val, 4, 2);
2214 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2215 return MCDisassembler::Fail;
2217 Inst.addOperand(MCOperand::CreateImm(0));
2219 Inst.addOperand(MCOperand::CreateImm(4 << align));
2224 static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Insn,
2225 uint64_t Address, const void *Decoder) {
2226 DecodeStatus S = MCDisassembler::Success;
2228 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2229 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2230 unsigned wb = fieldFromInstruction(Insn, 16, 4);
2231 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2232 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
2233 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2235 // First output register
2236 switch (Inst.getOpcode()) {
2237 case ARM::VLD1q16: case ARM::VLD1q32: case ARM::VLD1q64: case ARM::VLD1q8:
2238 case ARM::VLD1q16wb_fixed: case ARM::VLD1q16wb_register:
2239 case ARM::VLD1q32wb_fixed: case ARM::VLD1q32wb_register:
2240 case ARM::VLD1q64wb_fixed: case ARM::VLD1q64wb_register:
2241 case ARM::VLD1q8wb_fixed: case ARM::VLD1q8wb_register:
2242 case ARM::VLD2d16: case ARM::VLD2d32: case ARM::VLD2d8:
2243 case ARM::VLD2d16wb_fixed: case ARM::VLD2d16wb_register:
2244 case ARM::VLD2d32wb_fixed: case ARM::VLD2d32wb_register:
2245 case ARM::VLD2d8wb_fixed: case ARM::VLD2d8wb_register:
2246 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2247 return MCDisassembler::Fail;
2252 case ARM::VLD2b16wb_fixed:
2253 case ARM::VLD2b16wb_register:
2254 case ARM::VLD2b32wb_fixed:
2255 case ARM::VLD2b32wb_register:
2256 case ARM::VLD2b8wb_fixed:
2257 case ARM::VLD2b8wb_register:
2258 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2259 return MCDisassembler::Fail;
2262 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2263 return MCDisassembler::Fail;
2266 // Second output register
2267 switch (Inst.getOpcode()) {
2271 case ARM::VLD3d8_UPD:
2272 case ARM::VLD3d16_UPD:
2273 case ARM::VLD3d32_UPD:
2277 case ARM::VLD4d8_UPD:
2278 case ARM::VLD4d16_UPD:
2279 case ARM::VLD4d32_UPD:
2280 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
2281 return MCDisassembler::Fail;
2286 case ARM::VLD3q8_UPD:
2287 case ARM::VLD3q16_UPD:
2288 case ARM::VLD3q32_UPD:
2292 case ARM::VLD4q8_UPD:
2293 case ARM::VLD4q16_UPD:
2294 case ARM::VLD4q32_UPD:
2295 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2296 return MCDisassembler::Fail;
2301 // Third output register
2302 switch(Inst.getOpcode()) {
2306 case ARM::VLD3d8_UPD:
2307 case ARM::VLD3d16_UPD:
2308 case ARM::VLD3d32_UPD:
2312 case ARM::VLD4d8_UPD:
2313 case ARM::VLD4d16_UPD:
2314 case ARM::VLD4d32_UPD:
2315 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2316 return MCDisassembler::Fail;
2321 case ARM::VLD3q8_UPD:
2322 case ARM::VLD3q16_UPD:
2323 case ARM::VLD3q32_UPD:
2327 case ARM::VLD4q8_UPD:
2328 case ARM::VLD4q16_UPD:
2329 case ARM::VLD4q32_UPD:
2330 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
2331 return MCDisassembler::Fail;
2337 // Fourth output register
2338 switch (Inst.getOpcode()) {
2342 case ARM::VLD4d8_UPD:
2343 case ARM::VLD4d16_UPD:
2344 case ARM::VLD4d32_UPD:
2345 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
2346 return MCDisassembler::Fail;
2351 case ARM::VLD4q8_UPD:
2352 case ARM::VLD4q16_UPD:
2353 case ARM::VLD4q32_UPD:
2354 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
2355 return MCDisassembler::Fail;
2361 // Writeback operand
2362 switch (Inst.getOpcode()) {
2363 case ARM::VLD1d8wb_fixed:
2364 case ARM::VLD1d16wb_fixed:
2365 case ARM::VLD1d32wb_fixed:
2366 case ARM::VLD1d64wb_fixed:
2367 case ARM::VLD1d8wb_register:
2368 case ARM::VLD1d16wb_register:
2369 case ARM::VLD1d32wb_register:
2370 case ARM::VLD1d64wb_register:
2371 case ARM::VLD1q8wb_fixed:
2372 case ARM::VLD1q16wb_fixed:
2373 case ARM::VLD1q32wb_fixed:
2374 case ARM::VLD1q64wb_fixed:
2375 case ARM::VLD1q8wb_register:
2376 case ARM::VLD1q16wb_register:
2377 case ARM::VLD1q32wb_register:
2378 case ARM::VLD1q64wb_register:
2379 case ARM::VLD1d8Twb_fixed:
2380 case ARM::VLD1d8Twb_register:
2381 case ARM::VLD1d16Twb_fixed:
2382 case ARM::VLD1d16Twb_register:
2383 case ARM::VLD1d32Twb_fixed:
2384 case ARM::VLD1d32Twb_register:
2385 case ARM::VLD1d64Twb_fixed:
2386 case ARM::VLD1d64Twb_register:
2387 case ARM::VLD1d8Qwb_fixed:
2388 case ARM::VLD1d8Qwb_register:
2389 case ARM::VLD1d16Qwb_fixed:
2390 case ARM::VLD1d16Qwb_register:
2391 case ARM::VLD1d32Qwb_fixed:
2392 case ARM::VLD1d32Qwb_register:
2393 case ARM::VLD1d64Qwb_fixed:
2394 case ARM::VLD1d64Qwb_register:
2395 case ARM::VLD2d8wb_fixed:
2396 case ARM::VLD2d16wb_fixed:
2397 case ARM::VLD2d32wb_fixed:
2398 case ARM::VLD2q8wb_fixed:
2399 case ARM::VLD2q16wb_fixed:
2400 case ARM::VLD2q32wb_fixed:
2401 case ARM::VLD2d8wb_register:
2402 case ARM::VLD2d16wb_register:
2403 case ARM::VLD2d32wb_register:
2404 case ARM::VLD2q8wb_register:
2405 case ARM::VLD2q16wb_register:
2406 case ARM::VLD2q32wb_register:
2407 case ARM::VLD2b8wb_fixed:
2408 case ARM::VLD2b16wb_fixed:
2409 case ARM::VLD2b32wb_fixed:
2410 case ARM::VLD2b8wb_register:
2411 case ARM::VLD2b16wb_register:
2412 case ARM::VLD2b32wb_register:
2413 Inst.addOperand(MCOperand::CreateImm(0));
2415 case ARM::VLD3d8_UPD:
2416 case ARM::VLD3d16_UPD:
2417 case ARM::VLD3d32_UPD:
2418 case ARM::VLD3q8_UPD:
2419 case ARM::VLD3q16_UPD:
2420 case ARM::VLD3q32_UPD:
2421 case ARM::VLD4d8_UPD:
2422 case ARM::VLD4d16_UPD:
2423 case ARM::VLD4d32_UPD:
2424 case ARM::VLD4q8_UPD:
2425 case ARM::VLD4q16_UPD:
2426 case ARM::VLD4q32_UPD:
2427 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
2428 return MCDisassembler::Fail;
2434 // AddrMode6 Base (register+alignment)
2435 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
2436 return MCDisassembler::Fail;
2438 // AddrMode6 Offset (register)
2439 switch (Inst.getOpcode()) {
2441 // The below have been updated to have explicit am6offset split
2442 // between fixed and register offset. For those instructions not
2443 // yet updated, we need to add an additional reg0 operand for the
2446 // The fixed offset encodes as Rm == 0xd, so we check for that.
2448 Inst.addOperand(MCOperand::CreateReg(0));
2451 // Fall through to handle the register offset variant.
2452 case ARM::VLD1d8wb_fixed:
2453 case ARM::VLD1d16wb_fixed:
2454 case ARM::VLD1d32wb_fixed:
2455 case ARM::VLD1d64wb_fixed:
2456 case ARM::VLD1d8Twb_fixed:
2457 case ARM::VLD1d16Twb_fixed:
2458 case ARM::VLD1d32Twb_fixed:
2459 case ARM::VLD1d64Twb_fixed:
2460 case ARM::VLD1d8Qwb_fixed:
2461 case ARM::VLD1d16Qwb_fixed:
2462 case ARM::VLD1d32Qwb_fixed:
2463 case ARM::VLD1d64Qwb_fixed:
2464 case ARM::VLD1d8wb_register:
2465 case ARM::VLD1d16wb_register:
2466 case ARM::VLD1d32wb_register:
2467 case ARM::VLD1d64wb_register:
2468 case ARM::VLD1q8wb_fixed:
2469 case ARM::VLD1q16wb_fixed:
2470 case ARM::VLD1q32wb_fixed:
2471 case ARM::VLD1q64wb_fixed:
2472 case ARM::VLD1q8wb_register:
2473 case ARM::VLD1q16wb_register:
2474 case ARM::VLD1q32wb_register:
2475 case ARM::VLD1q64wb_register:
2476 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
2477 // variant encodes Rm == 0xf. Anything else is a register offset post-
2478 // increment and we need to add the register operand to the instruction.
2479 if (Rm != 0xD && Rm != 0xF &&
2480 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2481 return MCDisassembler::Fail;
2483 case ARM::VLD2d8wb_fixed:
2484 case ARM::VLD2d16wb_fixed:
2485 case ARM::VLD2d32wb_fixed:
2486 case ARM::VLD2b8wb_fixed:
2487 case ARM::VLD2b16wb_fixed:
2488 case ARM::VLD2b32wb_fixed:
2489 case ARM::VLD2q8wb_fixed:
2490 case ARM::VLD2q16wb_fixed:
2491 case ARM::VLD2q32wb_fixed:
2498 static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Insn,
2499 uint64_t Address, const void *Decoder) {
2500 unsigned type = fieldFromInstruction(Insn, 8, 4);
2501 unsigned align = fieldFromInstruction(Insn, 4, 2);
2502 if (type == 6 && (align & 2)) return MCDisassembler::Fail;
2503 if (type == 7 && (align & 2)) return MCDisassembler::Fail;
2504 if (type == 10 && align == 3) return MCDisassembler::Fail;
2506 unsigned load = fieldFromInstruction(Insn, 21, 1);
2507 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
2508 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
2511 static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Insn,
2512 uint64_t Address, const void *Decoder) {
2513 unsigned size = fieldFromInstruction(Insn, 6, 2);
2514 if (size == 3) return MCDisassembler::Fail;
2516 unsigned type = fieldFromInstruction(Insn, 8, 4);
2517 unsigned align = fieldFromInstruction(Insn, 4, 2);
2518 if (type == 8 && align == 3) return MCDisassembler::Fail;
2519 if (type == 9 && align == 3) return MCDisassembler::Fail;
2521 unsigned load = fieldFromInstruction(Insn, 21, 1);
2522 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
2523 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
2526 static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Insn,
2527 uint64_t Address, const void *Decoder) {
2528 unsigned size = fieldFromInstruction(Insn, 6, 2);
2529 if (size == 3) return MCDisassembler::Fail;
2531 unsigned align = fieldFromInstruction(Insn, 4, 2);
2532 if (align & 2) return MCDisassembler::Fail;
2534 unsigned load = fieldFromInstruction(Insn, 21, 1);
2535 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
2536 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
2539 static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Insn,
2540 uint64_t Address, const void *Decoder) {
2541 unsigned size = fieldFromInstruction(Insn, 6, 2);
2542 if (size == 3) return MCDisassembler::Fail;
2544 unsigned load = fieldFromInstruction(Insn, 21, 1);
2545 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder)
2546 : DecodeVSTInstruction(Inst, Insn, Address, Decoder);
2549 static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Insn,
2550 uint64_t Address, const void *Decoder) {
2551 DecodeStatus S = MCDisassembler::Success;
2553 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2554 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2555 unsigned wb = fieldFromInstruction(Insn, 16, 4);
2556 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2557 Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
2558 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2560 // Writeback Operand
2561 switch (Inst.getOpcode()) {
2562 case ARM::VST1d8wb_fixed:
2563 case ARM::VST1d16wb_fixed:
2564 case ARM::VST1d32wb_fixed:
2565 case ARM::VST1d64wb_fixed:
2566 case ARM::VST1d8wb_register:
2567 case ARM::VST1d16wb_register:
2568 case ARM::VST1d32wb_register:
2569 case ARM::VST1d64wb_register:
2570 case ARM::VST1q8wb_fixed:
2571 case ARM::VST1q16wb_fixed:
2572 case ARM::VST1q32wb_fixed:
2573 case ARM::VST1q64wb_fixed:
2574 case ARM::VST1q8wb_register:
2575 case ARM::VST1q16wb_register:
2576 case ARM::VST1q32wb_register:
2577 case ARM::VST1q64wb_register:
2578 case ARM::VST1d8Twb_fixed:
2579 case ARM::VST1d16Twb_fixed:
2580 case ARM::VST1d32Twb_fixed:
2581 case ARM::VST1d64Twb_fixed:
2582 case ARM::VST1d8Twb_register:
2583 case ARM::VST1d16Twb_register:
2584 case ARM::VST1d32Twb_register:
2585 case ARM::VST1d64Twb_register:
2586 case ARM::VST1d8Qwb_fixed:
2587 case ARM::VST1d16Qwb_fixed:
2588 case ARM::VST1d32Qwb_fixed:
2589 case ARM::VST1d64Qwb_fixed:
2590 case ARM::VST1d8Qwb_register:
2591 case ARM::VST1d16Qwb_register:
2592 case ARM::VST1d32Qwb_register:
2593 case ARM::VST1d64Qwb_register:
2594 case ARM::VST2d8wb_fixed:
2595 case ARM::VST2d16wb_fixed:
2596 case ARM::VST2d32wb_fixed:
2597 case ARM::VST2d8wb_register:
2598 case ARM::VST2d16wb_register:
2599 case ARM::VST2d32wb_register:
2600 case ARM::VST2q8wb_fixed:
2601 case ARM::VST2q16wb_fixed:
2602 case ARM::VST2q32wb_fixed:
2603 case ARM::VST2q8wb_register:
2604 case ARM::VST2q16wb_register:
2605 case ARM::VST2q32wb_register:
2606 case ARM::VST2b8wb_fixed:
2607 case ARM::VST2b16wb_fixed:
2608 case ARM::VST2b32wb_fixed:
2609 case ARM::VST2b8wb_register:
2610 case ARM::VST2b16wb_register:
2611 case ARM::VST2b32wb_register:
2613 return MCDisassembler::Fail;
2614 Inst.addOperand(MCOperand::CreateImm(0));
2616 case ARM::VST3d8_UPD:
2617 case ARM::VST3d16_UPD:
2618 case ARM::VST3d32_UPD:
2619 case ARM::VST3q8_UPD:
2620 case ARM::VST3q16_UPD:
2621 case ARM::VST3q32_UPD:
2622 case ARM::VST4d8_UPD:
2623 case ARM::VST4d16_UPD:
2624 case ARM::VST4d32_UPD:
2625 case ARM::VST4q8_UPD:
2626 case ARM::VST4q16_UPD:
2627 case ARM::VST4q32_UPD:
2628 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder)))
2629 return MCDisassembler::Fail;
2635 // AddrMode6 Base (register+alignment)
2636 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder)))
2637 return MCDisassembler::Fail;
2639 // AddrMode6 Offset (register)
2640 switch (Inst.getOpcode()) {
2643 Inst.addOperand(MCOperand::CreateReg(0));
2644 else if (Rm != 0xF) {
2645 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2646 return MCDisassembler::Fail;
2649 case ARM::VST1d8wb_fixed:
2650 case ARM::VST1d16wb_fixed:
2651 case ARM::VST1d32wb_fixed:
2652 case ARM::VST1d64wb_fixed:
2653 case ARM::VST1q8wb_fixed:
2654 case ARM::VST1q16wb_fixed:
2655 case ARM::VST1q32wb_fixed:
2656 case ARM::VST1q64wb_fixed:
2657 case ARM::VST1d8Twb_fixed:
2658 case ARM::VST1d16Twb_fixed:
2659 case ARM::VST1d32Twb_fixed:
2660 case ARM::VST1d64Twb_fixed:
2661 case ARM::VST1d8Qwb_fixed:
2662 case ARM::VST1d16Qwb_fixed:
2663 case ARM::VST1d32Qwb_fixed:
2664 case ARM::VST1d64Qwb_fixed:
2665 case ARM::VST2d8wb_fixed:
2666 case ARM::VST2d16wb_fixed:
2667 case ARM::VST2d32wb_fixed:
2668 case ARM::VST2q8wb_fixed:
2669 case ARM::VST2q16wb_fixed:
2670 case ARM::VST2q32wb_fixed:
2671 case ARM::VST2b8wb_fixed:
2672 case ARM::VST2b16wb_fixed:
2673 case ARM::VST2b32wb_fixed:
2678 // First input register
2679 switch (Inst.getOpcode()) {
2684 case ARM::VST1q16wb_fixed:
2685 case ARM::VST1q16wb_register:
2686 case ARM::VST1q32wb_fixed:
2687 case ARM::VST1q32wb_register:
2688 case ARM::VST1q64wb_fixed:
2689 case ARM::VST1q64wb_register:
2690 case ARM::VST1q8wb_fixed:
2691 case ARM::VST1q8wb_register:
2695 case ARM::VST2d16wb_fixed:
2696 case ARM::VST2d16wb_register:
2697 case ARM::VST2d32wb_fixed:
2698 case ARM::VST2d32wb_register:
2699 case ARM::VST2d8wb_fixed:
2700 case ARM::VST2d8wb_register:
2701 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2702 return MCDisassembler::Fail;
2707 case ARM::VST2b16wb_fixed:
2708 case ARM::VST2b16wb_register:
2709 case ARM::VST2b32wb_fixed:
2710 case ARM::VST2b32wb_register:
2711 case ARM::VST2b8wb_fixed:
2712 case ARM::VST2b8wb_register:
2713 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2714 return MCDisassembler::Fail;
2717 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2718 return MCDisassembler::Fail;
2721 // Second input register
2722 switch (Inst.getOpcode()) {
2726 case ARM::VST3d8_UPD:
2727 case ARM::VST3d16_UPD:
2728 case ARM::VST3d32_UPD:
2732 case ARM::VST4d8_UPD:
2733 case ARM::VST4d16_UPD:
2734 case ARM::VST4d32_UPD:
2735 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder)))
2736 return MCDisassembler::Fail;
2741 case ARM::VST3q8_UPD:
2742 case ARM::VST3q16_UPD:
2743 case ARM::VST3q32_UPD:
2747 case ARM::VST4q8_UPD:
2748 case ARM::VST4q16_UPD:
2749 case ARM::VST4q32_UPD:
2750 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2751 return MCDisassembler::Fail;
2757 // Third input register
2758 switch (Inst.getOpcode()) {
2762 case ARM::VST3d8_UPD:
2763 case ARM::VST3d16_UPD:
2764 case ARM::VST3d32_UPD:
2768 case ARM::VST4d8_UPD:
2769 case ARM::VST4d16_UPD:
2770 case ARM::VST4d32_UPD:
2771 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder)))
2772 return MCDisassembler::Fail;
2777 case ARM::VST3q8_UPD:
2778 case ARM::VST3q16_UPD:
2779 case ARM::VST3q32_UPD:
2783 case ARM::VST4q8_UPD:
2784 case ARM::VST4q16_UPD:
2785 case ARM::VST4q32_UPD:
2786 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder)))
2787 return MCDisassembler::Fail;
2793 // Fourth input register
2794 switch (Inst.getOpcode()) {
2798 case ARM::VST4d8_UPD:
2799 case ARM::VST4d16_UPD:
2800 case ARM::VST4d32_UPD:
2801 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder)))
2802 return MCDisassembler::Fail;
2807 case ARM::VST4q8_UPD:
2808 case ARM::VST4q16_UPD:
2809 case ARM::VST4q32_UPD:
2810 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder)))
2811 return MCDisassembler::Fail;
2820 static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Insn,
2821 uint64_t Address, const void *Decoder) {
2822 DecodeStatus S = MCDisassembler::Success;
2824 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2825 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2826 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2827 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2828 unsigned align = fieldFromInstruction(Insn, 4, 1);
2829 unsigned size = fieldFromInstruction(Insn, 6, 2);
2831 if (size == 0 && align == 1)
2832 return MCDisassembler::Fail;
2833 align *= (1 << size);
2835 switch (Inst.getOpcode()) {
2836 case ARM::VLD1DUPq16: case ARM::VLD1DUPq32: case ARM::VLD1DUPq8:
2837 case ARM::VLD1DUPq16wb_fixed: case ARM::VLD1DUPq16wb_register:
2838 case ARM::VLD1DUPq32wb_fixed: case ARM::VLD1DUPq32wb_register:
2839 case ARM::VLD1DUPq8wb_fixed: case ARM::VLD1DUPq8wb_register:
2840 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2841 return MCDisassembler::Fail;
2844 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2845 return MCDisassembler::Fail;
2849 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2850 return MCDisassembler::Fail;
2853 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2854 return MCDisassembler::Fail;
2855 Inst.addOperand(MCOperand::CreateImm(align));
2857 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback
2858 // variant encodes Rm == 0xf. Anything else is a register offset post-
2859 // increment and we need to add the register operand to the instruction.
2860 if (Rm != 0xD && Rm != 0xF &&
2861 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2862 return MCDisassembler::Fail;
2867 static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Insn,
2868 uint64_t Address, const void *Decoder) {
2869 DecodeStatus S = MCDisassembler::Success;
2871 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2872 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2873 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2874 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2875 unsigned align = fieldFromInstruction(Insn, 4, 1);
2876 unsigned size = 1 << fieldFromInstruction(Insn, 6, 2);
2879 switch (Inst.getOpcode()) {
2880 case ARM::VLD2DUPd16: case ARM::VLD2DUPd32: case ARM::VLD2DUPd8:
2881 case ARM::VLD2DUPd16wb_fixed: case ARM::VLD2DUPd16wb_register:
2882 case ARM::VLD2DUPd32wb_fixed: case ARM::VLD2DUPd32wb_register:
2883 case ARM::VLD2DUPd8wb_fixed: case ARM::VLD2DUPd8wb_register:
2884 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder)))
2885 return MCDisassembler::Fail;
2887 case ARM::VLD2DUPd16x2: case ARM::VLD2DUPd32x2: case ARM::VLD2DUPd8x2:
2888 case ARM::VLD2DUPd16x2wb_fixed: case ARM::VLD2DUPd16x2wb_register:
2889 case ARM::VLD2DUPd32x2wb_fixed: case ARM::VLD2DUPd32x2wb_register:
2890 case ARM::VLD2DUPd8x2wb_fixed: case ARM::VLD2DUPd8x2wb_register:
2891 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder)))
2892 return MCDisassembler::Fail;
2895 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2896 return MCDisassembler::Fail;
2901 Inst.addOperand(MCOperand::CreateImm(0));
2903 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2904 return MCDisassembler::Fail;
2905 Inst.addOperand(MCOperand::CreateImm(align));
2907 if (Rm != 0xD && Rm != 0xF) {
2908 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2909 return MCDisassembler::Fail;
2915 static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Insn,
2916 uint64_t Address, const void *Decoder) {
2917 DecodeStatus S = MCDisassembler::Success;
2919 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2920 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2921 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2922 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2923 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
2925 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2926 return MCDisassembler::Fail;
2927 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
2928 return MCDisassembler::Fail;
2929 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*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(0));
2941 Inst.addOperand(MCOperand::CreateReg(0));
2942 else if (Rm != 0xF) {
2943 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2944 return MCDisassembler::Fail;
2950 static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Insn,
2951 uint64_t Address, const void *Decoder) {
2952 DecodeStatus S = MCDisassembler::Success;
2954 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
2955 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
2956 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
2957 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
2958 unsigned size = fieldFromInstruction(Insn, 6, 2);
2959 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
2960 unsigned align = fieldFromInstruction(Insn, 4, 1);
2964 return MCDisassembler::Fail;
2977 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
2978 return MCDisassembler::Fail;
2979 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder)))
2980 return MCDisassembler::Fail;
2981 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder)))
2982 return MCDisassembler::Fail;
2983 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder)))
2984 return MCDisassembler::Fail;
2986 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2987 return MCDisassembler::Fail;
2990 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
2991 return MCDisassembler::Fail;
2992 Inst.addOperand(MCOperand::CreateImm(align));
2995 Inst.addOperand(MCOperand::CreateReg(0));
2996 else if (Rm != 0xF) {
2997 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
2998 return MCDisassembler::Fail;
3005 DecodeNEONModImmInstruction(MCInst &Inst, unsigned Insn,
3006 uint64_t Address, const void *Decoder) {
3007 DecodeStatus S = MCDisassembler::Success;
3009 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3010 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3011 unsigned imm = fieldFromInstruction(Insn, 0, 4);
3012 imm |= fieldFromInstruction(Insn, 16, 3) << 4;
3013 imm |= fieldFromInstruction(Insn, 24, 1) << 7;
3014 imm |= fieldFromInstruction(Insn, 8, 4) << 8;
3015 imm |= fieldFromInstruction(Insn, 5, 1) << 12;
3016 unsigned Q = fieldFromInstruction(Insn, 6, 1);
3019 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3020 return MCDisassembler::Fail;
3022 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3023 return MCDisassembler::Fail;
3026 Inst.addOperand(MCOperand::CreateImm(imm));
3028 switch (Inst.getOpcode()) {
3029 case ARM::VORRiv4i16:
3030 case ARM::VORRiv2i32:
3031 case ARM::VBICiv4i16:
3032 case ARM::VBICiv2i32:
3033 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3034 return MCDisassembler::Fail;
3036 case ARM::VORRiv8i16:
3037 case ARM::VORRiv4i32:
3038 case ARM::VBICiv8i16:
3039 case ARM::VBICiv4i32:
3040 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3041 return MCDisassembler::Fail;
3050 static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Insn,
3051 uint64_t Address, const void *Decoder) {
3052 DecodeStatus S = MCDisassembler::Success;
3054 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3055 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3056 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3057 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3058 unsigned size = fieldFromInstruction(Insn, 18, 2);
3060 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder)))
3061 return MCDisassembler::Fail;
3062 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3063 return MCDisassembler::Fail;
3064 Inst.addOperand(MCOperand::CreateImm(8 << size));
3069 static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
3070 uint64_t Address, const void *Decoder) {
3071 Inst.addOperand(MCOperand::CreateImm(8 - Val));
3072 return MCDisassembler::Success;
3075 static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
3076 uint64_t Address, const void *Decoder) {
3077 Inst.addOperand(MCOperand::CreateImm(16 - Val));
3078 return MCDisassembler::Success;
3081 static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
3082 uint64_t Address, const void *Decoder) {
3083 Inst.addOperand(MCOperand::CreateImm(32 - Val));
3084 return MCDisassembler::Success;
3087 static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
3088 uint64_t Address, const void *Decoder) {
3089 Inst.addOperand(MCOperand::CreateImm(64 - Val));
3090 return MCDisassembler::Success;
3093 static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
3094 uint64_t Address, const void *Decoder) {
3095 DecodeStatus S = MCDisassembler::Success;
3097 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3098 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
3099 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3100 Rn |= fieldFromInstruction(Insn, 7, 1) << 4;
3101 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3102 Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
3103 unsigned op = fieldFromInstruction(Insn, 6, 1);
3105 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3106 return MCDisassembler::Fail;
3108 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
3109 return MCDisassembler::Fail; // Writeback
3112 switch (Inst.getOpcode()) {
3115 if (!Check(S, DecodeDPairRegisterClass(Inst, Rn, Address, Decoder)))
3116 return MCDisassembler::Fail;
3119 if (!Check(S, DecodeDPRRegisterClass(Inst, Rn, Address, Decoder)))
3120 return MCDisassembler::Fail;
3123 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder)))
3124 return MCDisassembler::Fail;
3129 static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn,
3130 uint64_t Address, const void *Decoder) {
3131 DecodeStatus S = MCDisassembler::Success;
3133 unsigned dst = fieldFromInstruction(Insn, 8, 3);
3134 unsigned imm = fieldFromInstruction(Insn, 0, 8);
3136 if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder)))
3137 return MCDisassembler::Fail;
3139 switch(Inst.getOpcode()) {
3141 return MCDisassembler::Fail;
3143 break; // tADR does not explicitly represent the PC as an operand.
3145 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3149 Inst.addOperand(MCOperand::CreateImm(imm));
3153 static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
3154 uint64_t Address, const void *Decoder) {
3155 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<12>(Val<<1) + 4,
3156 true, 2, Inst, Decoder))
3157 Inst.addOperand(MCOperand::CreateImm(SignExtend32<12>(Val << 1)));
3158 return MCDisassembler::Success;
3161 static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
3162 uint64_t Address, const void *Decoder) {
3163 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<21>(Val) + 4,
3164 true, 4, Inst, Decoder))
3165 Inst.addOperand(MCOperand::CreateImm(SignExtend32<21>(Val)));
3166 return MCDisassembler::Success;
3169 static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
3170 uint64_t Address, const void *Decoder) {
3171 if (!tryAddingSymbolicOperand(Address, Address + (Val<<1) + 4,
3172 true, 2, Inst, Decoder))
3173 Inst.addOperand(MCOperand::CreateImm(Val << 1));
3174 return MCDisassembler::Success;
3177 static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val,
3178 uint64_t Address, const void *Decoder) {
3179 DecodeStatus S = MCDisassembler::Success;
3181 unsigned Rn = fieldFromInstruction(Val, 0, 3);
3182 unsigned Rm = fieldFromInstruction(Val, 3, 3);
3184 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
3185 return MCDisassembler::Fail;
3186 if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder)))
3187 return MCDisassembler::Fail;
3192 static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val,
3193 uint64_t Address, const void *Decoder) {
3194 DecodeStatus S = MCDisassembler::Success;
3196 unsigned Rn = fieldFromInstruction(Val, 0, 3);
3197 unsigned imm = fieldFromInstruction(Val, 3, 5);
3199 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
3200 return MCDisassembler::Fail;
3201 Inst.addOperand(MCOperand::CreateImm(imm));
3206 static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
3207 uint64_t Address, const void *Decoder) {
3208 unsigned imm = Val << 2;
3210 Inst.addOperand(MCOperand::CreateImm(imm));
3211 tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder);
3213 return MCDisassembler::Success;
3216 static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
3217 uint64_t Address, const void *Decoder) {
3218 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3219 Inst.addOperand(MCOperand::CreateImm(Val));
3221 return MCDisassembler::Success;
3224 static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
3225 uint64_t Address, const void *Decoder) {
3226 DecodeStatus S = MCDisassembler::Success;
3228 unsigned Rn = fieldFromInstruction(Val, 6, 4);
3229 unsigned Rm = fieldFromInstruction(Val, 2, 4);
3230 unsigned imm = fieldFromInstruction(Val, 0, 2);
3232 // Thumb stores cannot use PC as dest register.
3233 switch (Inst.getOpcode()) {
3238 return MCDisassembler::Fail;
3243 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3244 return MCDisassembler::Fail;
3245 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
3246 return MCDisassembler::Fail;
3247 Inst.addOperand(MCOperand::CreateImm(imm));
3252 static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Insn,
3253 uint64_t Address, const void *Decoder) {
3254 DecodeStatus S = MCDisassembler::Success;
3256 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3257 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3260 switch (Inst.getOpcode()) {
3262 Inst.setOpcode(ARM::t2LDRBpci);
3265 Inst.setOpcode(ARM::t2LDRHpci);
3268 Inst.setOpcode(ARM::t2LDRSHpci);
3271 Inst.setOpcode(ARM::t2LDRSBpci);
3274 Inst.setOpcode(ARM::t2LDRpci);
3277 Inst.setOpcode(ARM::t2PLDpci);
3280 Inst.setOpcode(ARM::t2PLIpci);
3283 return MCDisassembler::Fail;
3286 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3290 switch (Inst.getOpcode()) {
3292 return MCDisassembler::Fail;
3294 // FIXME: this instruction is only available with MP extensions,
3295 // this should be checked first but we don't have access to the
3296 // feature bits here.
3297 Inst.setOpcode(ARM::t2PLDWs);
3304 switch (Inst.getOpcode()) {
3310 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3311 return MCDisassembler::Fail;
3314 unsigned addrmode = fieldFromInstruction(Insn, 4, 2);
3315 addrmode |= fieldFromInstruction(Insn, 0, 4) << 2;
3316 addrmode |= fieldFromInstruction(Insn, 16, 4) << 6;
3317 if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder)))
3318 return MCDisassembler::Fail;
3323 static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn,
3324 uint64_t Address, const void* Decoder) {
3325 DecodeStatus S = MCDisassembler::Success;
3327 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3328 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3329 unsigned U = fieldFromInstruction(Insn, 9, 1);
3330 unsigned imm = fieldFromInstruction(Insn, 0, 8);
3335 switch (Inst.getOpcode()) {
3337 Inst.setOpcode(ARM::t2LDRpci);
3340 Inst.setOpcode(ARM::t2LDRBpci);
3342 case ARM::t2LDRSBi8:
3343 Inst.setOpcode(ARM::t2LDRSBpci);
3346 Inst.setOpcode(ARM::t2LDRHpci);
3348 case ARM::t2LDRSHi8:
3349 Inst.setOpcode(ARM::t2LDRSHpci);
3352 Inst.setOpcode(ARM::t2PLDpci);
3355 Inst.setOpcode(ARM::t2PLIpci);
3358 return MCDisassembler::Fail;
3360 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3364 switch (Inst.getOpcode()) {
3365 case ARM::t2LDRSHi8:
3366 return MCDisassembler::Fail;
3372 switch (Inst.getOpcode()) {
3378 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3379 return MCDisassembler::Fail;
3382 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
3383 return MCDisassembler::Fail;
3387 static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn,
3388 uint64_t Address, const void* Decoder) {
3389 DecodeStatus S = MCDisassembler::Success;
3391 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3392 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3393 unsigned imm = fieldFromInstruction(Insn, 0, 12);
3397 switch (Inst.getOpcode()) {
3399 Inst.setOpcode(ARM::t2LDRpci);
3401 case ARM::t2LDRHi12:
3402 Inst.setOpcode(ARM::t2LDRHpci);
3404 case ARM::t2LDRSHi12:
3405 Inst.setOpcode(ARM::t2LDRSHpci);
3407 case ARM::t2LDRBi12:
3408 Inst.setOpcode(ARM::t2LDRBpci);
3410 case ARM::t2LDRSBi12:
3411 Inst.setOpcode(ARM::t2LDRSBpci);
3414 Inst.setOpcode(ARM::t2PLDpci);
3417 Inst.setOpcode(ARM::t2PLIpci);
3420 return MCDisassembler::Fail;
3422 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3426 switch (Inst.getOpcode()) {
3427 case ARM::t2LDRSHi12:
3428 return MCDisassembler::Fail;
3429 case ARM::t2LDRHi12:
3430 Inst.setOpcode(ARM::t2PLDi12);
3437 switch (Inst.getOpcode()) {
3439 case ARM::t2PLDWi12:
3443 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3444 return MCDisassembler::Fail;
3447 if (!Check(S, DecodeT2AddrModeImm12(Inst, imm, Address, Decoder)))
3448 return MCDisassembler::Fail;
3452 static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn,
3453 uint64_t Address, const void* Decoder) {
3454 DecodeStatus S = MCDisassembler::Success;
3456 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3457 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3458 unsigned imm = fieldFromInstruction(Insn, 0, 8);
3462 switch (Inst.getOpcode()) {
3464 Inst.setOpcode(ARM::t2LDRpci);
3467 Inst.setOpcode(ARM::t2LDRBpci);
3470 Inst.setOpcode(ARM::t2LDRHpci);
3473 Inst.setOpcode(ARM::t2LDRSBpci);
3476 Inst.setOpcode(ARM::t2LDRSHpci);
3479 return MCDisassembler::Fail;
3481 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3484 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
3485 return MCDisassembler::Fail;
3486 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder)))
3487 return MCDisassembler::Fail;
3491 static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn,
3492 uint64_t Address, const void* Decoder) {
3493 DecodeStatus S = MCDisassembler::Success;
3495 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3496 unsigned U = fieldFromInstruction(Insn, 23, 1);
3497 int imm = fieldFromInstruction(Insn, 0, 12);
3500 switch (Inst.getOpcode()) {
3501 case ARM::t2LDRBpci:
3502 case ARM::t2LDRHpci:
3503 Inst.setOpcode(ARM::t2PLDpci);
3505 case ARM::t2LDRSBpci:
3506 Inst.setOpcode(ARM::t2PLIpci);
3508 case ARM::t2LDRSHpci:
3509 return MCDisassembler::Fail;
3515 switch(Inst.getOpcode()) {
3520 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3521 return MCDisassembler::Fail;
3525 // Special case for #-0.
3531 Inst.addOperand(MCOperand::CreateImm(imm));
3536 static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val,
3537 uint64_t Address, const void *Decoder) {
3539 Inst.addOperand(MCOperand::CreateImm(INT32_MIN));
3541 int imm = Val & 0xFF;
3543 if (!(Val & 0x100)) imm *= -1;
3544 Inst.addOperand(MCOperand::CreateImm(imm * 4));
3547 return MCDisassembler::Success;
3550 static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val,
3551 uint64_t Address, const void *Decoder) {
3552 DecodeStatus S = MCDisassembler::Success;
3554 unsigned Rn = fieldFromInstruction(Val, 9, 4);
3555 unsigned imm = fieldFromInstruction(Val, 0, 9);
3557 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3558 return MCDisassembler::Fail;
3559 if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder)))
3560 return MCDisassembler::Fail;
3565 static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val,
3566 uint64_t Address, const void *Decoder) {
3567 DecodeStatus S = MCDisassembler::Success;
3569 unsigned Rn = fieldFromInstruction(Val, 8, 4);
3570 unsigned imm = fieldFromInstruction(Val, 0, 8);
3572 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
3573 return MCDisassembler::Fail;
3575 Inst.addOperand(MCOperand::CreateImm(imm));
3580 static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val,
3581 uint64_t Address, const void *Decoder) {
3582 int imm = Val & 0xFF;
3585 else if (!(Val & 0x100))
3587 Inst.addOperand(MCOperand::CreateImm(imm));
3589 return MCDisassembler::Success;
3593 static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
3594 uint64_t Address, const void *Decoder) {
3595 DecodeStatus S = MCDisassembler::Success;
3597 unsigned Rn = fieldFromInstruction(Val, 9, 4);
3598 unsigned imm = fieldFromInstruction(Val, 0, 9);
3600 // Thumb stores cannot use PC as dest register.
3601 switch (Inst.getOpcode()) {
3609 return MCDisassembler::Fail;
3615 // Some instructions always use an additive offset.
3616 switch (Inst.getOpcode()) {
3631 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3632 return MCDisassembler::Fail;
3633 if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder)))
3634 return MCDisassembler::Fail;
3639 static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Insn,
3640 uint64_t Address, const void *Decoder) {
3641 DecodeStatus S = MCDisassembler::Success;
3643 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3644 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3645 unsigned addr = fieldFromInstruction(Insn, 0, 8);
3646 addr |= fieldFromInstruction(Insn, 9, 1) << 8;
3648 unsigned load = fieldFromInstruction(Insn, 20, 1);
3651 switch (Inst.getOpcode()) {
3652 case ARM::t2LDR_PRE:
3653 case ARM::t2LDR_POST:
3654 Inst.setOpcode(ARM::t2LDRpci);
3656 case ARM::t2LDRB_PRE:
3657 case ARM::t2LDRB_POST:
3658 Inst.setOpcode(ARM::t2LDRBpci);
3660 case ARM::t2LDRH_PRE:
3661 case ARM::t2LDRH_POST:
3662 Inst.setOpcode(ARM::t2LDRHpci);
3664 case ARM::t2LDRSB_PRE:
3665 case ARM::t2LDRSB_POST:
3667 Inst.setOpcode(ARM::t2PLIpci);
3669 Inst.setOpcode(ARM::t2LDRSBpci);
3671 case ARM::t2LDRSH_PRE:
3672 case ARM::t2LDRSH_POST:
3673 Inst.setOpcode(ARM::t2LDRSHpci);
3676 return MCDisassembler::Fail;
3678 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
3682 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3683 return MCDisassembler::Fail;
3686 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
3687 return MCDisassembler::Fail;
3690 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3691 return MCDisassembler::Fail;
3694 if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder)))
3695 return MCDisassembler::Fail;
3700 static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val,
3701 uint64_t Address, const void *Decoder) {
3702 DecodeStatus S = MCDisassembler::Success;
3704 unsigned Rn = fieldFromInstruction(Val, 13, 4);
3705 unsigned imm = fieldFromInstruction(Val, 0, 12);
3707 // Thumb stores cannot use PC as dest register.
3708 switch (Inst.getOpcode()) {
3710 case ARM::t2STRBi12:
3711 case ARM::t2STRHi12:
3713 return MCDisassembler::Fail;
3718 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3719 return MCDisassembler::Fail;
3720 Inst.addOperand(MCOperand::CreateImm(imm));
3726 static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Insn,
3727 uint64_t Address, const void *Decoder) {
3728 unsigned imm = fieldFromInstruction(Insn, 0, 7);
3730 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3731 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3732 Inst.addOperand(MCOperand::CreateImm(imm));
3734 return MCDisassembler::Success;
3737 static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
3738 uint64_t Address, const void *Decoder) {
3739 DecodeStatus S = MCDisassembler::Success;
3741 if (Inst.getOpcode() == ARM::tADDrSP) {
3742 unsigned Rdm = fieldFromInstruction(Insn, 0, 3);
3743 Rdm |= fieldFromInstruction(Insn, 7, 1) << 3;
3745 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
3746 return MCDisassembler::Fail;
3747 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3748 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
3749 return MCDisassembler::Fail;
3750 } else if (Inst.getOpcode() == ARM::tADDspr) {
3751 unsigned Rm = fieldFromInstruction(Insn, 3, 4);
3753 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3754 Inst.addOperand(MCOperand::CreateReg(ARM::SP));
3755 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
3756 return MCDisassembler::Fail;
3762 static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn,
3763 uint64_t Address, const void *Decoder) {
3764 unsigned imod = fieldFromInstruction(Insn, 4, 1) | 0x2;
3765 unsigned flags = fieldFromInstruction(Insn, 0, 3);
3767 Inst.addOperand(MCOperand::CreateImm(imod));
3768 Inst.addOperand(MCOperand::CreateImm(flags));
3770 return MCDisassembler::Success;
3773 static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn,
3774 uint64_t Address, const void *Decoder) {
3775 DecodeStatus S = MCDisassembler::Success;
3776 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3777 unsigned add = fieldFromInstruction(Insn, 4, 1);
3779 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
3780 return MCDisassembler::Fail;
3781 Inst.addOperand(MCOperand::CreateImm(add));
3786 static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Val,
3787 uint64_t Address, const void *Decoder) {
3788 // Val is passed in as S:J1:J2:imm10H:imm10L:'0'
3789 // Note only one trailing zero not two. Also the J1 and J2 values are from
3790 // the encoded instruction. So here change to I1 and I2 values via:
3791 // I1 = NOT(J1 EOR S);
3792 // I2 = NOT(J2 EOR S);
3793 // and build the imm32 with two trailing zeros as documented:
3794 // imm32 = SignExtend(S:I1:I2:imm10H:imm10L:'00', 32);
3795 unsigned S = (Val >> 23) & 1;
3796 unsigned J1 = (Val >> 22) & 1;
3797 unsigned J2 = (Val >> 21) & 1;
3798 unsigned I1 = !(J1 ^ S);
3799 unsigned I2 = !(J2 ^ S);
3800 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21);
3801 int imm32 = SignExtend32<25>(tmp << 1);
3803 if (!tryAddingSymbolicOperand(Address,
3804 (Address & ~2u) + imm32 + 4,
3805 true, 4, Inst, Decoder))
3806 Inst.addOperand(MCOperand::CreateImm(imm32));
3807 return MCDisassembler::Success;
3810 static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Val,
3811 uint64_t Address, const void *Decoder) {
3812 if (Val == 0xA || Val == 0xB)
3813 return MCDisassembler::Fail;
3815 Inst.addOperand(MCOperand::CreateImm(Val));
3816 return MCDisassembler::Success;
3820 DecodeThumbTableBranch(MCInst &Inst, unsigned Insn,
3821 uint64_t Address, const void *Decoder) {
3822 DecodeStatus S = MCDisassembler::Success;
3824 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3825 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
3827 if (Rn == ARM::SP) S = MCDisassembler::SoftFail;
3828 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3829 return MCDisassembler::Fail;
3830 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder)))
3831 return MCDisassembler::Fail;
3836 DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Insn,
3837 uint64_t Address, const void *Decoder) {
3838 DecodeStatus S = MCDisassembler::Success;
3840 unsigned pred = fieldFromInstruction(Insn, 22, 4);
3841 if (pred == 0xE || pred == 0xF) {
3842 unsigned opc = fieldFromInstruction(Insn, 4, 28);
3845 return MCDisassembler::Fail;
3847 Inst.setOpcode(ARM::t2DSB);
3850 Inst.setOpcode(ARM::t2DMB);
3853 Inst.setOpcode(ARM::t2ISB);
3857 unsigned imm = fieldFromInstruction(Insn, 0, 4);
3858 return DecodeMemBarrierOption(Inst, imm, Address, Decoder);
3861 unsigned brtarget = fieldFromInstruction(Insn, 0, 11) << 1;
3862 brtarget |= fieldFromInstruction(Insn, 11, 1) << 19;
3863 brtarget |= fieldFromInstruction(Insn, 13, 1) << 18;
3864 brtarget |= fieldFromInstruction(Insn, 16, 6) << 12;
3865 brtarget |= fieldFromInstruction(Insn, 26, 1) << 20;
3867 if (!Check(S, DecodeT2BROperand(Inst, brtarget, Address, Decoder)))
3868 return MCDisassembler::Fail;
3869 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
3870 return MCDisassembler::Fail;
3875 // Decode a shifted immediate operand. These basically consist
3876 // of an 8-bit value, and a 4-bit directive that specifies either
3877 // a splat operation or a rotation.
3878 static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val,
3879 uint64_t Address, const void *Decoder) {
3880 unsigned ctrl = fieldFromInstruction(Val, 10, 2);
3882 unsigned byte = fieldFromInstruction(Val, 8, 2);
3883 unsigned imm = fieldFromInstruction(Val, 0, 8);
3886 Inst.addOperand(MCOperand::CreateImm(imm));
3889 Inst.addOperand(MCOperand::CreateImm((imm << 16) | imm));
3892 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 8)));
3895 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 16) |
3900 unsigned unrot = fieldFromInstruction(Val, 0, 7) | 0x80;
3901 unsigned rot = fieldFromInstruction(Val, 7, 5);
3902 unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31));
3903 Inst.addOperand(MCOperand::CreateImm(imm));
3906 return MCDisassembler::Success;
3910 DecodeThumbBCCTargetOperand(MCInst &Inst, unsigned Val,
3911 uint64_t Address, const void *Decoder){
3912 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<9>(Val<<1) + 4,
3913 true, 2, Inst, Decoder))
3914 Inst.addOperand(MCOperand::CreateImm(SignExtend32<9>(Val << 1)));
3915 return MCDisassembler::Success;
3918 static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val,
3919 uint64_t Address, const void *Decoder){
3920 // Val is passed in as S:J1:J2:imm10:imm11
3921 // Note no trailing zero after imm11. Also the J1 and J2 values are from
3922 // the encoded instruction. So here change to I1 and I2 values via:
3923 // I1 = NOT(J1 EOR S);
3924 // I2 = NOT(J2 EOR S);
3925 // and build the imm32 with one trailing zero as documented:
3926 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32);
3927 unsigned S = (Val >> 23) & 1;
3928 unsigned J1 = (Val >> 22) & 1;
3929 unsigned J2 = (Val >> 21) & 1;
3930 unsigned I1 = !(J1 ^ S);
3931 unsigned I2 = !(J2 ^ S);
3932 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21);
3933 int imm32 = SignExtend32<25>(tmp << 1);
3935 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
3936 true, 4, Inst, Decoder))
3937 Inst.addOperand(MCOperand::CreateImm(imm32));
3938 return MCDisassembler::Success;
3941 static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Val,
3942 uint64_t Address, const void *Decoder) {
3944 return MCDisassembler::Fail;
3946 Inst.addOperand(MCOperand::CreateImm(Val));
3947 return MCDisassembler::Success;
3950 static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Val,
3951 uint64_t Address, const void *Decoder) {
3953 return MCDisassembler::Fail;
3955 Inst.addOperand(MCOperand::CreateImm(Val));
3956 return MCDisassembler::Success;
3959 static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Val,
3960 uint64_t Address, const void *Decoder) {
3961 if (!Val) return MCDisassembler::Fail;
3962 Inst.addOperand(MCOperand::CreateImm(Val));
3963 return MCDisassembler::Success;
3966 static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn,
3967 uint64_t Address, const void *Decoder) {
3968 DecodeStatus S = MCDisassembler::Success;
3970 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
3971 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3972 unsigned pred = fieldFromInstruction(Insn, 28, 4);
3975 S = MCDisassembler::SoftFail;
3977 if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder)))
3978 return MCDisassembler::Fail;
3979 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
3980 return MCDisassembler::Fail;
3981 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
3982 return MCDisassembler::Fail;
3987 static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn,
3988 uint64_t Address, const void *Decoder){
3989 DecodeStatus S = MCDisassembler::Success;
3991 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
3992 unsigned Rt = fieldFromInstruction(Insn, 0, 4);
3993 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
3994 unsigned pred = fieldFromInstruction(Insn, 28, 4);
3996 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
3997 return MCDisassembler::Fail;
3999 if (Rn == 0xF || Rd == Rn || Rd == Rt || Rd == Rt+1)
4000 S = MCDisassembler::SoftFail;
4002 if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder)))
4003 return MCDisassembler::Fail;
4004 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4005 return MCDisassembler::Fail;
4006 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4007 return MCDisassembler::Fail;
4012 static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn,
4013 uint64_t Address, const void *Decoder) {
4014 DecodeStatus S = MCDisassembler::Success;
4016 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4017 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4018 unsigned imm = fieldFromInstruction(Insn, 0, 12);
4019 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
4020 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
4021 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4023 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
4025 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4026 return MCDisassembler::Fail;
4027 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4028 return MCDisassembler::Fail;
4029 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder)))
4030 return MCDisassembler::Fail;
4031 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4032 return MCDisassembler::Fail;
4037 static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn,
4038 uint64_t Address, const void *Decoder) {
4039 DecodeStatus S = MCDisassembler::Success;
4041 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4042 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4043 unsigned imm = fieldFromInstruction(Insn, 0, 12);
4044 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
4045 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
4046 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4047 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4049 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
4050 if (Rm == 0xF) S = MCDisassembler::SoftFail;
4052 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4053 return MCDisassembler::Fail;
4054 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4055 return MCDisassembler::Fail;
4056 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder)))
4057 return MCDisassembler::Fail;
4058 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4059 return MCDisassembler::Fail;
4065 static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn,
4066 uint64_t Address, const void *Decoder) {
4067 DecodeStatus S = MCDisassembler::Success;
4069 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4070 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4071 unsigned imm = fieldFromInstruction(Insn, 0, 12);
4072 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
4073 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
4074 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4076 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
4078 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4079 return MCDisassembler::Fail;
4080 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4081 return MCDisassembler::Fail;
4082 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder)))
4083 return MCDisassembler::Fail;
4084 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4085 return MCDisassembler::Fail;
4090 static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn,
4091 uint64_t Address, const void *Decoder) {
4092 DecodeStatus S = MCDisassembler::Success;
4094 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4095 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4096 unsigned imm = fieldFromInstruction(Insn, 0, 12);
4097 imm |= fieldFromInstruction(Insn, 16, 4) << 13;
4098 imm |= fieldFromInstruction(Insn, 23, 1) << 12;
4099 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4101 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail;
4103 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4104 return MCDisassembler::Fail;
4105 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
4106 return MCDisassembler::Fail;
4107 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder)))
4108 return MCDisassembler::Fail;
4109 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4110 return MCDisassembler::Fail;
4115 static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn,
4116 uint64_t Address, const void *Decoder) {
4117 DecodeStatus S = MCDisassembler::Success;
4119 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4120 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4121 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4122 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4123 unsigned size = fieldFromInstruction(Insn, 10, 2);
4129 return MCDisassembler::Fail;
4131 if (fieldFromInstruction(Insn, 4, 1))
4132 return MCDisassembler::Fail; // UNDEFINED
4133 index = fieldFromInstruction(Insn, 5, 3);
4136 if (fieldFromInstruction(Insn, 5, 1))
4137 return MCDisassembler::Fail; // UNDEFINED
4138 index = fieldFromInstruction(Insn, 6, 2);
4139 if (fieldFromInstruction(Insn, 4, 1))
4143 if (fieldFromInstruction(Insn, 6, 1))
4144 return MCDisassembler::Fail; // UNDEFINED
4145 index = fieldFromInstruction(Insn, 7, 1);
4147 switch (fieldFromInstruction(Insn, 4, 2)) {
4153 return MCDisassembler::Fail;
4158 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4159 return MCDisassembler::Fail;
4160 if (Rm != 0xF) { // Writeback
4161 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4162 return MCDisassembler::Fail;
4164 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4165 return MCDisassembler::Fail;
4166 Inst.addOperand(MCOperand::CreateImm(align));
4169 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4170 return MCDisassembler::Fail;
4172 Inst.addOperand(MCOperand::CreateReg(0));
4175 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4176 return MCDisassembler::Fail;
4177 Inst.addOperand(MCOperand::CreateImm(index));
4182 static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn,
4183 uint64_t Address, const void *Decoder) {
4184 DecodeStatus S = MCDisassembler::Success;
4186 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4187 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4188 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4189 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4190 unsigned size = fieldFromInstruction(Insn, 10, 2);
4196 return MCDisassembler::Fail;
4198 if (fieldFromInstruction(Insn, 4, 1))
4199 return MCDisassembler::Fail; // UNDEFINED
4200 index = fieldFromInstruction(Insn, 5, 3);
4203 if (fieldFromInstruction(Insn, 5, 1))
4204 return MCDisassembler::Fail; // UNDEFINED
4205 index = fieldFromInstruction(Insn, 6, 2);
4206 if (fieldFromInstruction(Insn, 4, 1))
4210 if (fieldFromInstruction(Insn, 6, 1))
4211 return MCDisassembler::Fail; // UNDEFINED
4212 index = fieldFromInstruction(Insn, 7, 1);
4214 switch (fieldFromInstruction(Insn, 4, 2)) {
4220 return MCDisassembler::Fail;
4225 if (Rm != 0xF) { // Writeback
4226 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4227 return MCDisassembler::Fail;
4229 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4230 return MCDisassembler::Fail;
4231 Inst.addOperand(MCOperand::CreateImm(align));
4234 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4235 return MCDisassembler::Fail;
4237 Inst.addOperand(MCOperand::CreateReg(0));
4240 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4241 return MCDisassembler::Fail;
4242 Inst.addOperand(MCOperand::CreateImm(index));
4248 static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn,
4249 uint64_t Address, const void *Decoder) {
4250 DecodeStatus S = MCDisassembler::Success;
4252 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4253 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4254 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4255 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4256 unsigned size = fieldFromInstruction(Insn, 10, 2);
4263 return MCDisassembler::Fail;
4265 index = fieldFromInstruction(Insn, 5, 3);
4266 if (fieldFromInstruction(Insn, 4, 1))
4270 index = fieldFromInstruction(Insn, 6, 2);
4271 if (fieldFromInstruction(Insn, 4, 1))
4273 if (fieldFromInstruction(Insn, 5, 1))
4277 if (fieldFromInstruction(Insn, 5, 1))
4278 return MCDisassembler::Fail; // UNDEFINED
4279 index = fieldFromInstruction(Insn, 7, 1);
4280 if (fieldFromInstruction(Insn, 4, 1) != 0)
4282 if (fieldFromInstruction(Insn, 6, 1))
4287 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4288 return MCDisassembler::Fail;
4289 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4290 return MCDisassembler::Fail;
4291 if (Rm != 0xF) { // Writeback
4292 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4293 return MCDisassembler::Fail;
4295 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4296 return MCDisassembler::Fail;
4297 Inst.addOperand(MCOperand::CreateImm(align));
4300 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4301 return MCDisassembler::Fail;
4303 Inst.addOperand(MCOperand::CreateReg(0));
4306 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4307 return MCDisassembler::Fail;
4308 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4309 return MCDisassembler::Fail;
4310 Inst.addOperand(MCOperand::CreateImm(index));
4315 static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn,
4316 uint64_t Address, const void *Decoder) {
4317 DecodeStatus S = MCDisassembler::Success;
4319 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4320 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4321 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4322 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4323 unsigned size = fieldFromInstruction(Insn, 10, 2);
4330 return MCDisassembler::Fail;
4332 index = fieldFromInstruction(Insn, 5, 3);
4333 if (fieldFromInstruction(Insn, 4, 1))
4337 index = fieldFromInstruction(Insn, 6, 2);
4338 if (fieldFromInstruction(Insn, 4, 1))
4340 if (fieldFromInstruction(Insn, 5, 1))
4344 if (fieldFromInstruction(Insn, 5, 1))
4345 return MCDisassembler::Fail; // UNDEFINED
4346 index = fieldFromInstruction(Insn, 7, 1);
4347 if (fieldFromInstruction(Insn, 4, 1) != 0)
4349 if (fieldFromInstruction(Insn, 6, 1))
4354 if (Rm != 0xF) { // Writeback
4355 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4356 return MCDisassembler::Fail;
4358 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4359 return MCDisassembler::Fail;
4360 Inst.addOperand(MCOperand::CreateImm(align));
4363 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4364 return MCDisassembler::Fail;
4366 Inst.addOperand(MCOperand::CreateReg(0));
4369 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4370 return MCDisassembler::Fail;
4371 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4372 return MCDisassembler::Fail;
4373 Inst.addOperand(MCOperand::CreateImm(index));
4379 static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn,
4380 uint64_t Address, const void *Decoder) {
4381 DecodeStatus S = MCDisassembler::Success;
4383 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4384 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4385 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4386 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4387 unsigned size = fieldFromInstruction(Insn, 10, 2);
4394 return MCDisassembler::Fail;
4396 if (fieldFromInstruction(Insn, 4, 1))
4397 return MCDisassembler::Fail; // UNDEFINED
4398 index = fieldFromInstruction(Insn, 5, 3);
4401 if (fieldFromInstruction(Insn, 4, 1))
4402 return MCDisassembler::Fail; // UNDEFINED
4403 index = fieldFromInstruction(Insn, 6, 2);
4404 if (fieldFromInstruction(Insn, 5, 1))
4408 if (fieldFromInstruction(Insn, 4, 2))
4409 return MCDisassembler::Fail; // UNDEFINED
4410 index = fieldFromInstruction(Insn, 7, 1);
4411 if (fieldFromInstruction(Insn, 6, 1))
4416 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4417 return MCDisassembler::Fail;
4418 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4419 return MCDisassembler::Fail;
4420 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4421 return MCDisassembler::Fail;
4423 if (Rm != 0xF) { // Writeback
4424 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4425 return MCDisassembler::Fail;
4427 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4428 return MCDisassembler::Fail;
4429 Inst.addOperand(MCOperand::CreateImm(align));
4432 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4433 return MCDisassembler::Fail;
4435 Inst.addOperand(MCOperand::CreateReg(0));
4438 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4439 return MCDisassembler::Fail;
4440 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4441 return MCDisassembler::Fail;
4442 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4443 return MCDisassembler::Fail;
4444 Inst.addOperand(MCOperand::CreateImm(index));
4449 static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn,
4450 uint64_t Address, const void *Decoder) {
4451 DecodeStatus S = MCDisassembler::Success;
4453 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4454 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4455 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4456 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4457 unsigned size = fieldFromInstruction(Insn, 10, 2);
4464 return MCDisassembler::Fail;
4466 if (fieldFromInstruction(Insn, 4, 1))
4467 return MCDisassembler::Fail; // UNDEFINED
4468 index = fieldFromInstruction(Insn, 5, 3);
4471 if (fieldFromInstruction(Insn, 4, 1))
4472 return MCDisassembler::Fail; // UNDEFINED
4473 index = fieldFromInstruction(Insn, 6, 2);
4474 if (fieldFromInstruction(Insn, 5, 1))
4478 if (fieldFromInstruction(Insn, 4, 2))
4479 return MCDisassembler::Fail; // UNDEFINED
4480 index = fieldFromInstruction(Insn, 7, 1);
4481 if (fieldFromInstruction(Insn, 6, 1))
4486 if (Rm != 0xF) { // Writeback
4487 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4488 return MCDisassembler::Fail;
4490 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4491 return MCDisassembler::Fail;
4492 Inst.addOperand(MCOperand::CreateImm(align));
4495 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4496 return MCDisassembler::Fail;
4498 Inst.addOperand(MCOperand::CreateReg(0));
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 Inst.addOperand(MCOperand::CreateImm(index));
4513 static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn,
4514 uint64_t Address, const void *Decoder) {
4515 DecodeStatus S = MCDisassembler::Success;
4517 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4518 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4519 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4520 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4521 unsigned size = fieldFromInstruction(Insn, 10, 2);
4528 return MCDisassembler::Fail;
4530 if (fieldFromInstruction(Insn, 4, 1))
4532 index = fieldFromInstruction(Insn, 5, 3);
4535 if (fieldFromInstruction(Insn, 4, 1))
4537 index = fieldFromInstruction(Insn, 6, 2);
4538 if (fieldFromInstruction(Insn, 5, 1))
4542 switch (fieldFromInstruction(Insn, 4, 2)) {
4546 return MCDisassembler::Fail;
4548 align = 4 << fieldFromInstruction(Insn, 4, 2); break;
4551 index = fieldFromInstruction(Insn, 7, 1);
4552 if (fieldFromInstruction(Insn, 6, 1))
4557 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4558 return MCDisassembler::Fail;
4559 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4560 return MCDisassembler::Fail;
4561 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4562 return MCDisassembler::Fail;
4563 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder)))
4564 return MCDisassembler::Fail;
4566 if (Rm != 0xF) { // Writeback
4567 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4568 return MCDisassembler::Fail;
4570 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4571 return MCDisassembler::Fail;
4572 Inst.addOperand(MCOperand::CreateImm(align));
4575 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4576 return MCDisassembler::Fail;
4578 Inst.addOperand(MCOperand::CreateReg(0));
4581 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4582 return MCDisassembler::Fail;
4583 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4584 return MCDisassembler::Fail;
4585 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4586 return MCDisassembler::Fail;
4587 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder)))
4588 return MCDisassembler::Fail;
4589 Inst.addOperand(MCOperand::CreateImm(index));
4594 static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn,
4595 uint64_t Address, const void *Decoder) {
4596 DecodeStatus S = MCDisassembler::Success;
4598 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4599 unsigned Rm = fieldFromInstruction(Insn, 0, 4);
4600 unsigned Rd = fieldFromInstruction(Insn, 12, 4);
4601 Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
4602 unsigned size = fieldFromInstruction(Insn, 10, 2);
4609 return MCDisassembler::Fail;
4611 if (fieldFromInstruction(Insn, 4, 1))
4613 index = fieldFromInstruction(Insn, 5, 3);
4616 if (fieldFromInstruction(Insn, 4, 1))
4618 index = fieldFromInstruction(Insn, 6, 2);
4619 if (fieldFromInstruction(Insn, 5, 1))
4623 switch (fieldFromInstruction(Insn, 4, 2)) {
4627 return MCDisassembler::Fail;
4629 align = 4 << fieldFromInstruction(Insn, 4, 2); break;
4632 index = fieldFromInstruction(Insn, 7, 1);
4633 if (fieldFromInstruction(Insn, 6, 1))
4638 if (Rm != 0xF) { // Writeback
4639 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4640 return MCDisassembler::Fail;
4642 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
4643 return MCDisassembler::Fail;
4644 Inst.addOperand(MCOperand::CreateImm(align));
4647 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
4648 return MCDisassembler::Fail;
4650 Inst.addOperand(MCOperand::CreateReg(0));
4653 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
4654 return MCDisassembler::Fail;
4655 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
4656 return MCDisassembler::Fail;
4657 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder)))
4658 return MCDisassembler::Fail;
4659 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder)))
4660 return MCDisassembler::Fail;
4661 Inst.addOperand(MCOperand::CreateImm(index));
4666 static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn,
4667 uint64_t Address, const void *Decoder) {
4668 DecodeStatus S = MCDisassembler::Success;
4669 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4670 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
4671 unsigned Rm = fieldFromInstruction(Insn, 5, 1);
4672 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4673 Rm |= fieldFromInstruction(Insn, 0, 4) << 1;
4675 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F)
4676 S = MCDisassembler::SoftFail;
4678 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder)))
4679 return MCDisassembler::Fail;
4680 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder)))
4681 return MCDisassembler::Fail;
4682 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder)))
4683 return MCDisassembler::Fail;
4684 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder)))
4685 return MCDisassembler::Fail;
4686 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4687 return MCDisassembler::Fail;
4692 static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn,
4693 uint64_t Address, const void *Decoder) {
4694 DecodeStatus S = MCDisassembler::Success;
4695 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4696 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
4697 unsigned Rm = fieldFromInstruction(Insn, 5, 1);
4698 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4699 Rm |= fieldFromInstruction(Insn, 0, 4) << 1;
4701 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F)
4702 S = MCDisassembler::SoftFail;
4704 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder)))
4705 return MCDisassembler::Fail;
4706 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder)))
4707 return MCDisassembler::Fail;
4708 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder)))
4709 return MCDisassembler::Fail;
4710 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder)))
4711 return MCDisassembler::Fail;
4712 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4713 return MCDisassembler::Fail;
4718 static DecodeStatus DecodeIT(MCInst &Inst, unsigned Insn,
4719 uint64_t Address, const void *Decoder) {
4720 DecodeStatus S = MCDisassembler::Success;
4721 unsigned pred = fieldFromInstruction(Insn, 4, 4);
4722 unsigned mask = fieldFromInstruction(Insn, 0, 4);
4726 S = MCDisassembler::SoftFail;
4730 return MCDisassembler::Fail;
4732 Inst.addOperand(MCOperand::CreateImm(pred));
4733 Inst.addOperand(MCOperand::CreateImm(mask));
4738 DecodeT2LDRDPreInstruction(MCInst &Inst, unsigned Insn,
4739 uint64_t Address, const void *Decoder) {
4740 DecodeStatus S = MCDisassembler::Success;
4742 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4743 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4);
4744 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4745 unsigned addr = fieldFromInstruction(Insn, 0, 8);
4746 unsigned W = fieldFromInstruction(Insn, 21, 1);
4747 unsigned U = fieldFromInstruction(Insn, 23, 1);
4748 unsigned P = fieldFromInstruction(Insn, 24, 1);
4749 bool writeback = (W == 1) | (P == 0);
4751 addr |= (U << 8) | (Rn << 9);
4753 if (writeback && (Rn == Rt || Rn == Rt2))
4754 Check(S, MCDisassembler::SoftFail);
4756 Check(S, MCDisassembler::SoftFail);
4759 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
4760 return MCDisassembler::Fail;
4762 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder)))
4763 return MCDisassembler::Fail;
4764 // Writeback operand
4765 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
4766 return MCDisassembler::Fail;
4768 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder)))
4769 return MCDisassembler::Fail;
4775 DecodeT2STRDPreInstruction(MCInst &Inst, unsigned Insn,
4776 uint64_t Address, const void *Decoder) {
4777 DecodeStatus S = MCDisassembler::Success;
4779 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4780 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4);
4781 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4782 unsigned addr = fieldFromInstruction(Insn, 0, 8);
4783 unsigned W = fieldFromInstruction(Insn, 21, 1);
4784 unsigned U = fieldFromInstruction(Insn, 23, 1);
4785 unsigned P = fieldFromInstruction(Insn, 24, 1);
4786 bool writeback = (W == 1) | (P == 0);
4788 addr |= (U << 8) | (Rn << 9);
4790 if (writeback && (Rn == Rt || Rn == Rt2))
4791 Check(S, MCDisassembler::SoftFail);
4793 // Writeback operand
4794 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
4795 return MCDisassembler::Fail;
4797 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
4798 return MCDisassembler::Fail;
4800 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder)))
4801 return MCDisassembler::Fail;
4803 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder)))
4804 return MCDisassembler::Fail;
4809 static DecodeStatus DecodeT2Adr(MCInst &Inst, uint32_t Insn,
4810 uint64_t Address, const void *Decoder) {
4811 unsigned sign1 = fieldFromInstruction(Insn, 21, 1);
4812 unsigned sign2 = fieldFromInstruction(Insn, 23, 1);
4813 if (sign1 != sign2) return MCDisassembler::Fail;
4815 unsigned Val = fieldFromInstruction(Insn, 0, 8);
4816 Val |= fieldFromInstruction(Insn, 12, 3) << 8;
4817 Val |= fieldFromInstruction(Insn, 26, 1) << 11;
4819 Inst.addOperand(MCOperand::CreateImm(SignExtend32<13>(Val)));
4821 return MCDisassembler::Success;
4824 static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, uint32_t Val,
4826 const void *Decoder) {
4827 DecodeStatus S = MCDisassembler::Success;
4829 // Shift of "asr #32" is not allowed in Thumb2 mode.
4830 if (Val == 0x20) S = MCDisassembler::SoftFail;
4831 Inst.addOperand(MCOperand::CreateImm(Val));
4835 static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn,
4836 uint64_t Address, const void *Decoder) {
4837 unsigned Rt = fieldFromInstruction(Insn, 12, 4);
4838 unsigned Rt2 = fieldFromInstruction(Insn, 0, 4);
4839 unsigned Rn = fieldFromInstruction(Insn, 16, 4);
4840 unsigned pred = fieldFromInstruction(Insn, 28, 4);
4843 return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
4845 DecodeStatus S = MCDisassembler::Success;
4847 if (Rt == Rn || Rn == Rt2)
4848 S = MCDisassembler::SoftFail;
4850 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
4851 return MCDisassembler::Fail;
4852 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder)))
4853 return MCDisassembler::Fail;
4854 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4855 return MCDisassembler::Fail;
4856 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder)))
4857 return MCDisassembler::Fail;
4862 static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn,
4863 uint64_t Address, const void *Decoder) {
4864 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0);
4865 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4);
4866 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0);
4867 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4);
4868 unsigned imm = fieldFromInstruction(Insn, 16, 6);
4869 unsigned cmode = fieldFromInstruction(Insn, 8, 4);
4870 unsigned op = fieldFromInstruction(Insn, 5, 1);
4872 DecodeStatus S = MCDisassembler::Success;
4874 // VMOVv2f32 is ambiguous with these decodings.
4875 if (!(imm & 0x38) && cmode == 0xF) {
4876 if (op == 1) return MCDisassembler::Fail;
4877 Inst.setOpcode(ARM::VMOVv2f32);
4878 return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder);
4881 if (!(imm & 0x20)) return MCDisassembler::Fail;
4883 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
4884 return MCDisassembler::Fail;
4885 if (!Check(S, DecodeDPRRegisterClass(Inst, Vm, Address, Decoder)))
4886 return MCDisassembler::Fail;
4887 Inst.addOperand(MCOperand::CreateImm(64 - imm));
4892 static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn,
4893 uint64_t Address, const void *Decoder) {
4894 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0);
4895 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4);
4896 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0);
4897 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4);
4898 unsigned imm = fieldFromInstruction(Insn, 16, 6);
4899 unsigned cmode = fieldFromInstruction(Insn, 8, 4);
4900 unsigned op = fieldFromInstruction(Insn, 5, 1);
4902 DecodeStatus S = MCDisassembler::Success;
4904 // VMOVv4f32 is ambiguous with these decodings.
4905 if (!(imm & 0x38) && cmode == 0xF) {
4906 if (op == 1) return MCDisassembler::Fail;
4907 Inst.setOpcode(ARM::VMOVv4f32);
4908 return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder);
4911 if (!(imm & 0x20)) return MCDisassembler::Fail;
4913 if (!Check(S, DecodeQPRRegisterClass(Inst, Vd, Address, Decoder)))
4914 return MCDisassembler::Fail;
4915 if (!Check(S, DecodeQPRRegisterClass(Inst, Vm, Address, Decoder)))
4916 return MCDisassembler::Fail;
4917 Inst.addOperand(MCOperand::CreateImm(64 - imm));
4922 static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val,
4923 uint64_t Address, const void *Decoder) {
4924 DecodeStatus S = MCDisassembler::Success;
4926 unsigned Rn = fieldFromInstruction(Val, 16, 4);
4927 unsigned Rt = fieldFromInstruction(Val, 12, 4);
4928 unsigned Rm = fieldFromInstruction(Val, 0, 4);
4929 Rm |= (fieldFromInstruction(Val, 23, 1) << 4);
4930 unsigned Cond = fieldFromInstruction(Val, 28, 4);
4932 if (fieldFromInstruction(Val, 8, 4) != 0 || Rn == Rt)
4933 S = MCDisassembler::SoftFail;
4935 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
4936 return MCDisassembler::Fail;
4937 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
4938 return MCDisassembler::Fail;
4939 if (!Check(S, DecodeAddrMode7Operand(Inst, Rn, Address, Decoder)))
4940 return MCDisassembler::Fail;
4941 if (!Check(S, DecodePostIdxReg(Inst, Rm, Address, Decoder)))
4942 return MCDisassembler::Fail;
4943 if (!Check(S, DecodePredicateOperand(Inst, Cond, Address, Decoder)))
4944 return MCDisassembler::Fail;
4949 static DecodeStatus DecodeMRRC2(llvm::MCInst &Inst, unsigned Val,
4950 uint64_t Address, const void *Decoder) {
4952 DecodeStatus S = MCDisassembler::Success;
4954 unsigned CRm = fieldFromInstruction(Val, 0, 4);
4955 unsigned opc1 = fieldFromInstruction(Val, 4, 4);
4956 unsigned cop = fieldFromInstruction(Val, 8, 4);
4957 unsigned Rt = fieldFromInstruction(Val, 12, 4);
4958 unsigned Rt2 = fieldFromInstruction(Val, 16, 4);
4960 if ((cop & ~0x1) == 0xa)
4961 return MCDisassembler::Fail;
4964 S = MCDisassembler::SoftFail;
4966 Inst.addOperand(MCOperand::CreateImm(cop));
4967 Inst.addOperand(MCOperand::CreateImm(opc1));
4968 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
4969 return MCDisassembler::Fail;
4970 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder)))
4971 return MCDisassembler::Fail;
4972 Inst.addOperand(MCOperand::CreateImm(CRm));