ARMDisassembler.cpp revision 341825
1//===- ARMDisassembler.cpp - Disassembler for ARM/Thumb ISA ---------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#include "MCTargetDesc/ARMAddressingModes.h" 11#include "MCTargetDesc/ARMBaseInfo.h" 12#include "MCTargetDesc/ARMMCTargetDesc.h" 13#include "Utils/ARMBaseInfo.h" 14#include "llvm/MC/MCContext.h" 15#include "llvm/MC/MCDisassembler/MCDisassembler.h" 16#include "llvm/MC/MCFixedLenDisassembler.h" 17#include "llvm/MC/MCInst.h" 18#include "llvm/MC/MCInstrDesc.h" 19#include "llvm/MC/MCSubtargetInfo.h" 20#include "llvm/MC/SubtargetFeature.h" 21#include "llvm/Support/Compiler.h" 22#include "llvm/Support/ErrorHandling.h" 23#include "llvm/Support/MathExtras.h" 24#include "llvm/Support/TargetRegistry.h" 25#include "llvm/Support/raw_ostream.h" 26#include <algorithm> 27#include <cassert> 28#include <cstdint> 29#include <vector> 30 31using namespace llvm; 32 33#define DEBUG_TYPE "arm-disassembler" 34 35using DecodeStatus = MCDisassembler::DecodeStatus; 36 37namespace { 38 39 // Handles the condition code status of instructions in IT blocks 40 class ITStatus 41 { 42 public: 43 // Returns the condition code for instruction in IT block 44 unsigned getITCC() { 45 unsigned CC = ARMCC::AL; 46 if (instrInITBlock()) 47 CC = ITStates.back(); 48 return CC; 49 } 50 51 // Advances the IT block state to the next T or E 52 void advanceITState() { 53 ITStates.pop_back(); 54 } 55 56 // Returns true if the current instruction is in an IT block 57 bool instrInITBlock() { 58 return !ITStates.empty(); 59 } 60 61 // Returns true if current instruction is the last instruction in an IT block 62 bool instrLastInITBlock() { 63 return ITStates.size() == 1; 64 } 65 66 // Called when decoding an IT instruction. Sets the IT state for the following 67 // instructions that for the IT block. Firstcond and Mask correspond to the 68 // fields in the IT instruction encoding. 69 void setITState(char Firstcond, char Mask) { 70 // (3 - the number of trailing zeros) is the number of then / else. 71 unsigned CondBit0 = Firstcond & 1; 72 unsigned NumTZ = countTrailingZeros<uint8_t>(Mask); 73 unsigned char CCBits = static_cast<unsigned char>(Firstcond & 0xf); 74 assert(NumTZ <= 3 && "Invalid IT mask!"); 75 // push condition codes onto the stack the correct order for the pops 76 for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) { 77 bool T = ((Mask >> Pos) & 1) == CondBit0; 78 if (T) 79 ITStates.push_back(CCBits); 80 else 81 ITStates.push_back(CCBits ^ 1); 82 } 83 ITStates.push_back(CCBits); 84 } 85 86 private: 87 std::vector<unsigned char> ITStates; 88 }; 89 90/// ARM disassembler for all ARM platforms. 91class ARMDisassembler : public MCDisassembler { 92public: 93 ARMDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx) : 94 MCDisassembler(STI, Ctx) { 95 } 96 97 ~ARMDisassembler() override = default; 98 99 DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size, 100 ArrayRef<uint8_t> Bytes, uint64_t Address, 101 raw_ostream &VStream, 102 raw_ostream &CStream) const override; 103}; 104 105/// Thumb disassembler for all Thumb platforms. 106class ThumbDisassembler : public MCDisassembler { 107public: 108 ThumbDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx) : 109 MCDisassembler(STI, Ctx) { 110 } 111 112 ~ThumbDisassembler() override = default; 113 114 DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size, 115 ArrayRef<uint8_t> Bytes, uint64_t Address, 116 raw_ostream &VStream, 117 raw_ostream &CStream) const override; 118 119private: 120 mutable ITStatus ITBlock; 121 122 DecodeStatus AddThumbPredicate(MCInst&) const; 123 void UpdateThumbVFPPredicate(MCInst&) const; 124}; 125 126} // end anonymous namespace 127 128static bool Check(DecodeStatus &Out, DecodeStatus In) { 129 switch (In) { 130 case MCDisassembler::Success: 131 // Out stays the same. 132 return true; 133 case MCDisassembler::SoftFail: 134 Out = In; 135 return true; 136 case MCDisassembler::Fail: 137 Out = In; 138 return false; 139 } 140 llvm_unreachable("Invalid DecodeStatus!"); 141} 142 143// Forward declare these because the autogenerated code will reference them. 144// Definitions are further down. 145static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo, 146 uint64_t Address, const void *Decoder); 147static DecodeStatus DecodeGPRnopcRegisterClass(MCInst &Inst, 148 unsigned RegNo, uint64_t Address, 149 const void *Decoder); 150static DecodeStatus DecodeGPRwithAPSRRegisterClass(MCInst &Inst, 151 unsigned RegNo, uint64_t Address, 152 const void *Decoder); 153static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo, 154 uint64_t Address, const void *Decoder); 155static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo, 156 uint64_t Address, const void *Decoder); 157static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo, 158 uint64_t Address, const void *Decoder); 159static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo, 160 uint64_t Address, const void *Decoder); 161static DecodeStatus DecodeHPRRegisterClass(MCInst &Inst, unsigned RegNo, 162 uint64_t Address, const void *Decoder); 163static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo, 164 uint64_t Address, const void *Decoder); 165static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo, 166 uint64_t Address, const void *Decoder); 167static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo, 168 uint64_t Address, const void *Decoder); 169static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst &Inst, 170 unsigned RegNo, 171 uint64_t Address, 172 const void *Decoder); 173static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo, 174 uint64_t Address, const void *Decoder); 175static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo, 176 uint64_t Address, const void *Decoder); 177static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst &Inst, 178 unsigned RegNo, uint64_t Address, 179 const void *Decoder); 180 181static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val, 182 uint64_t Address, const void *Decoder); 183static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val, 184 uint64_t Address, const void *Decoder); 185static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val, 186 uint64_t Address, const void *Decoder); 187static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val, 188 uint64_t Address, const void *Decoder); 189static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val, 190 uint64_t Address, const void *Decoder); 191 192static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Insn, 193 uint64_t Address, const void *Decoder); 194static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn, 195 uint64_t Address, const void *Decoder); 196static DecodeStatus DecodeAddrMode2IdxInstruction(MCInst &Inst, 197 unsigned Insn, 198 uint64_t Address, 199 const void *Decoder); 200static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Insn, 201 uint64_t Address, const void *Decoder); 202static DecodeStatus DecodeAddrMode3Instruction(MCInst &Inst,unsigned Insn, 203 uint64_t Address, const void *Decoder); 204static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Insn, 205 uint64_t Address, const void *Decoder); 206static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Insn, 207 uint64_t Address, const void *Decoder); 208 209static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst & Inst, 210 unsigned Insn, 211 uint64_t Adddress, 212 const void *Decoder); 213static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn, 214 uint64_t Address, const void *Decoder); 215static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn, 216 uint64_t Address, const void *Decoder); 217static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn, 218 uint64_t Address, const void *Decoder); 219static DecodeStatus DecodeHINTInstruction(MCInst &Inst, unsigned Insn, 220 uint64_t Address, const void *Decoder); 221static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn, 222 uint64_t Address, const void *Decoder); 223static DecodeStatus DecodeTSTInstruction(MCInst &Inst, unsigned Insn, 224 uint64_t Address, const void *Decoder); 225static DecodeStatus DecodeSETPANInstruction(MCInst &Inst, unsigned Insn, 226 uint64_t Address, const void *Decoder); 227static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn, 228 uint64_t Address, const void *Decoder); 229static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val, 230 uint64_t Address, const void *Decoder); 231static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val, 232 uint64_t Address, const void *Decoder); 233static DecodeStatus DecodeAddrMode5FP16Operand(MCInst &Inst, unsigned Val, 234 uint64_t Address, const void *Decoder); 235static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val, 236 uint64_t Address, const void *Decoder); 237static DecodeStatus DecodeT2BInstruction(MCInst &Inst, unsigned Insn, 238 uint64_t Address, const void *Decoder); 239static DecodeStatus DecodeBranchImmInstruction(MCInst &Inst,unsigned Insn, 240 uint64_t Address, const void *Decoder); 241static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val, 242 uint64_t Address, const void *Decoder); 243static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Val, 244 uint64_t Address, const void *Decoder); 245static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Val, 246 uint64_t Address, const void *Decoder); 247static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Val, 248 uint64_t Address, const void *Decoder); 249static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Val, 250 uint64_t Address, const void *Decoder); 251static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Val, 252 uint64_t Address, const void *Decoder); 253static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Val, 254 uint64_t Address, const void *Decoder); 255static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Val, 256 uint64_t Address, const void *Decoder); 257static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Val, 258 uint64_t Address, const void *Decoder); 259static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Val, 260 uint64_t Address, const void *Decoder); 261static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Val, 262 uint64_t Address, const void *Decoder); 263static DecodeStatus DecodeNEONModImmInstruction(MCInst &Inst,unsigned Val, 264 uint64_t Address, const void *Decoder); 265static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Val, 266 uint64_t Address, const void *Decoder); 267static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val, 268 uint64_t Address, const void *Decoder); 269static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val, 270 uint64_t Address, const void *Decoder); 271static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val, 272 uint64_t Address, const void *Decoder); 273static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val, 274 uint64_t Address, const void *Decoder); 275static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn, 276 uint64_t Address, const void *Decoder); 277static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn, 278 uint64_t Address, const void *Decoder); 279static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Insn, 280 uint64_t Address, const void *Decoder); 281static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Insn, 282 uint64_t Address, const void *Decoder); 283static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Insn, 284 uint64_t Address, const void *Decoder); 285static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Insn, 286 uint64_t Address, const void *Decoder); 287static DecodeStatus DecodeBankedReg(MCInst &Inst, unsigned Insn, 288 uint64_t Address, const void *Decoder); 289static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn, 290 uint64_t Address, const void *Decoder); 291static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn, 292 uint64_t Address, const void *Decoder); 293static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn, 294 uint64_t Address, const void *Decoder); 295static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn, 296 uint64_t Address, const void *Decoder); 297static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn, 298 uint64_t Address, const void *Decoder); 299static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn, 300 uint64_t Address, const void *Decoder); 301static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn, 302 uint64_t Address, const void *Decoder); 303static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn, 304 uint64_t Address, const void *Decoder); 305static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn, 306 uint64_t Address, const void *Decoder); 307static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn, 308 uint64_t Address, const void *Decoder); 309static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn, 310 uint64_t Address, const void *Decoder); 311static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn, 312 uint64_t Address, const void *Decoder); 313static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn, 314 uint64_t Address, const void *Decoder); 315static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn, 316 uint64_t Address, const void *Decoder); 317static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn, 318 uint64_t Address, const void *Decoder); 319static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn, 320 uint64_t Address, const void *Decoder); 321static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn, 322 uint64_t Address, const void *Decoder); 323static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn, 324 uint64_t Address, const void *Decoder); 325static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn, 326 uint64_t Address, const void *Decoder); 327static DecodeStatus DecodeNEONComplexLane64Instruction(MCInst &Inst, 328 unsigned Val, 329 uint64_t Address, 330 const void *Decoder); 331 332static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn, 333 uint64_t Address, const void *Decoder); 334static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val, 335 uint64_t Address, const void *Decoder); 336static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val, 337 uint64_t Address, const void *Decoder); 338static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val, 339 uint64_t Address, const void *Decoder); 340static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val, 341 uint64_t Address, const void *Decoder); 342static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val, 343 uint64_t Address, const void *Decoder); 344static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val, 345 uint64_t Address, const void *Decoder); 346static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val, 347 uint64_t Address, const void *Decoder); 348static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val, 349 uint64_t Address, const void *Decoder); 350static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Val, 351 uint64_t Address, const void *Decoder); 352static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn, 353 uint64_t Address, const void* Decoder); 354static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn, 355 uint64_t Address, const void* Decoder); 356static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn, 357 uint64_t Address, const void* Decoder); 358static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn, 359 uint64_t Address, const void* Decoder); 360static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val, 361 uint64_t Address, const void *Decoder); 362static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val, 363 uint64_t Address, const void *Decoder); 364static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val, 365 uint64_t Address, const void *Decoder); 366static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val, 367 uint64_t Address, const void *Decoder); 368static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val, 369 uint64_t Address, const void *Decoder); 370static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Val, 371 uint64_t Address, const void *Decoder); 372static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn, 373 uint64_t Address, const void *Decoder); 374static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn, 375 uint64_t Address, const void *Decoder); 376static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn, 377 uint64_t Address, const void *Decoder); 378static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Insn, 379 uint64_t Address, const void *Decoder); 380static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val, 381 uint64_t Address, const void *Decoder); 382static DecodeStatus DecodeThumbTableBranch(MCInst &Inst, unsigned Val, 383 uint64_t Address, const void *Decoder); 384static DecodeStatus DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Val, 385 uint64_t Address, const void *Decoder); 386static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val, 387 uint64_t Address, const void *Decoder); 388static DecodeStatus DecodeThumbBCCTargetOperand(MCInst &Inst,unsigned Val, 389 uint64_t Address, const void *Decoder); 390static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val, 391 uint64_t Address, const void *Decoder); 392static DecodeStatus DecodeIT(MCInst &Inst, unsigned Val, 393 uint64_t Address, const void *Decoder); 394static DecodeStatus DecodeT2LDRDPreInstruction(MCInst &Inst,unsigned Insn, 395 uint64_t Address, const void *Decoder); 396static DecodeStatus DecodeT2STRDPreInstruction(MCInst &Inst,unsigned Insn, 397 uint64_t Address, const void *Decoder); 398static DecodeStatus DecodeT2Adr(MCInst &Inst, unsigned Val, 399 uint64_t Address, const void *Decoder); 400static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Val, 401 uint64_t Address, const void *Decoder); 402static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, unsigned Val, 403 uint64_t Address, const void *Decoder); 404 405static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val, 406 uint64_t Address, const void *Decoder); 407static DecodeStatus DecoderForMRRC2AndMCRR2(MCInst &Inst, unsigned Val, 408 uint64_t Address, const void *Decoder); 409static DecodeStatus DecodeForVMRSandVMSR(MCInst &Inst, unsigned Val, 410 uint64_t Address, const void *Decoder); 411 412#include "ARMGenDisassemblerTables.inc" 413 414static MCDisassembler *createARMDisassembler(const Target &T, 415 const MCSubtargetInfo &STI, 416 MCContext &Ctx) { 417 return new ARMDisassembler(STI, Ctx); 418} 419 420static MCDisassembler *createThumbDisassembler(const Target &T, 421 const MCSubtargetInfo &STI, 422 MCContext &Ctx) { 423 return new ThumbDisassembler(STI, Ctx); 424} 425 426// Post-decoding checks 427static DecodeStatus checkDecodedInstruction(MCInst &MI, uint64_t &Size, 428 uint64_t Address, raw_ostream &OS, 429 raw_ostream &CS, 430 uint32_t Insn, 431 DecodeStatus Result) { 432 switch (MI.getOpcode()) { 433 case ARM::HVC: { 434 // HVC is undefined if condition = 0xf otherwise upredictable 435 // if condition != 0xe 436 uint32_t Cond = (Insn >> 28) & 0xF; 437 if (Cond == 0xF) 438 return MCDisassembler::Fail; 439 if (Cond != 0xE) 440 return MCDisassembler::SoftFail; 441 return Result; 442 } 443 default: return Result; 444 } 445} 446 447DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size, 448 ArrayRef<uint8_t> Bytes, 449 uint64_t Address, raw_ostream &OS, 450 raw_ostream &CS) const { 451 CommentStream = &CS; 452 453 assert(!STI.getFeatureBits()[ARM::ModeThumb] && 454 "Asked to disassemble an ARM instruction but Subtarget is in Thumb " 455 "mode!"); 456 457 // We want to read exactly 4 bytes of data. 458 if (Bytes.size() < 4) { 459 Size = 0; 460 return MCDisassembler::Fail; 461 } 462 463 // Encoded as a small-endian 32-bit word in the stream. 464 uint32_t Insn = 465 (Bytes[3] << 24) | (Bytes[2] << 16) | (Bytes[1] << 8) | (Bytes[0] << 0); 466 467 // Calling the auto-generated decoder function. 468 DecodeStatus Result = 469 decodeInstruction(DecoderTableARM32, MI, Insn, Address, this, STI); 470 if (Result != MCDisassembler::Fail) { 471 Size = 4; 472 return checkDecodedInstruction(MI, Size, Address, OS, CS, Insn, Result); 473 } 474 475 struct DecodeTable { 476 const uint8_t *P; 477 bool DecodePred; 478 }; 479 480 const DecodeTable Tables[] = { 481 {DecoderTableVFP32, false}, {DecoderTableVFPV832, false}, 482 {DecoderTableNEONData32, true}, {DecoderTableNEONLoadStore32, true}, 483 {DecoderTableNEONDup32, true}, {DecoderTablev8NEON32, false}, 484 {DecoderTablev8Crypto32, false}, 485 }; 486 487 for (auto Table : Tables) { 488 Result = decodeInstruction(Table.P, MI, Insn, Address, this, STI); 489 if (Result != MCDisassembler::Fail) { 490 Size = 4; 491 // Add a fake predicate operand, because we share these instruction 492 // definitions with Thumb2 where these instructions are predicable. 493 if (Table.DecodePred && !DecodePredicateOperand(MI, 0xE, Address, this)) 494 return MCDisassembler::Fail; 495 return Result; 496 } 497 } 498 499 Result = 500 decodeInstruction(DecoderTableCoProc32, MI, Insn, Address, this, STI); 501 if (Result != MCDisassembler::Fail) { 502 Size = 4; 503 return checkDecodedInstruction(MI, Size, Address, OS, CS, Insn, Result); 504 } 505 506 Size = 4; 507 return MCDisassembler::Fail; 508} 509 510namespace llvm { 511 512extern const MCInstrDesc ARMInsts[]; 513 514} // end namespace llvm 515 516/// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the 517/// immediate Value in the MCInst. The immediate Value has had any PC 518/// adjustment made by the caller. If the instruction is a branch instruction 519/// then isBranch is true, else false. If the getOpInfo() function was set as 520/// part of the setupForSymbolicDisassembly() call then that function is called 521/// to get any symbolic information at the Address for this instruction. If 522/// that returns non-zero then the symbolic information it returns is used to 523/// create an MCExpr and that is added as an operand to the MCInst. If 524/// getOpInfo() returns zero and isBranch is true then a symbol look up for 525/// Value is done and if a symbol is found an MCExpr is created with that, else 526/// an MCExpr with Value is created. This function returns true if it adds an 527/// operand to the MCInst and false otherwise. 528static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value, 529 bool isBranch, uint64_t InstSize, 530 MCInst &MI, const void *Decoder) { 531 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); 532 // FIXME: Does it make sense for value to be negative? 533 return Dis->tryAddingSymbolicOperand(MI, (uint32_t)Value, Address, isBranch, 534 /* Offset */ 0, InstSize); 535} 536 537/// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being 538/// referenced by a load instruction with the base register that is the Pc. 539/// These can often be values in a literal pool near the Address of the 540/// instruction. The Address of the instruction and its immediate Value are 541/// used as a possible literal pool entry. The SymbolLookUp call back will 542/// return the name of a symbol referenced by the literal pool's entry if 543/// the referenced address is that of a symbol. Or it will return a pointer to 544/// a literal 'C' string if the referenced address of the literal pool's entry 545/// is an address into a section with 'C' string literals. 546static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value, 547 const void *Decoder) { 548 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); 549 Dis->tryAddingPcLoadReferenceComment(Value, Address); 550} 551 552// Thumb1 instructions don't have explicit S bits. Rather, they 553// implicitly set CPSR. Since it's not represented in the encoding, the 554// auto-generated decoder won't inject the CPSR operand. We need to fix 555// that as a post-pass. 556static void AddThumb1SBit(MCInst &MI, bool InITBlock) { 557 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; 558 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; 559 MCInst::iterator I = MI.begin(); 560 for (unsigned i = 0; i < NumOps; ++i, ++I) { 561 if (I == MI.end()) break; 562 if (OpInfo[i].isOptionalDef() && OpInfo[i].RegClass == ARM::CCRRegClassID) { 563 if (i > 0 && OpInfo[i-1].isPredicate()) continue; 564 MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR)); 565 return; 566 } 567 } 568 569 MI.insert(I, MCOperand::createReg(InITBlock ? 0 : ARM::CPSR)); 570} 571 572// Most Thumb instructions don't have explicit predicates in the 573// encoding, but rather get their predicates from IT context. We need 574// to fix up the predicate operands using this context information as a 575// post-pass. 576MCDisassembler::DecodeStatus 577ThumbDisassembler::AddThumbPredicate(MCInst &MI) const { 578 MCDisassembler::DecodeStatus S = Success; 579 580 const FeatureBitset &FeatureBits = getSubtargetInfo().getFeatureBits(); 581 582 // A few instructions actually have predicates encoded in them. Don't 583 // try to overwrite it if we're seeing one of those. 584 switch (MI.getOpcode()) { 585 case ARM::tBcc: 586 case ARM::t2Bcc: 587 case ARM::tCBZ: 588 case ARM::tCBNZ: 589 case ARM::tCPS: 590 case ARM::t2CPS3p: 591 case ARM::t2CPS2p: 592 case ARM::t2CPS1p: 593 case ARM::tMOVSr: 594 case ARM::tSETEND: 595 // Some instructions (mostly conditional branches) are not 596 // allowed in IT blocks. 597 if (ITBlock.instrInITBlock()) 598 S = SoftFail; 599 else 600 return Success; 601 break; 602 case ARM::t2HINT: 603 if (MI.getOperand(0).getImm() == 0x10 && (FeatureBits[ARM::FeatureRAS]) != 0) 604 S = SoftFail; 605 break; 606 case ARM::tB: 607 case ARM::t2B: 608 case ARM::t2TBB: 609 case ARM::t2TBH: 610 // Some instructions (mostly unconditional branches) can 611 // only appears at the end of, or outside of, an IT. 612 if (ITBlock.instrInITBlock() && !ITBlock.instrLastInITBlock()) 613 S = SoftFail; 614 break; 615 default: 616 break; 617 } 618 619 // If we're in an IT block, base the predicate on that. Otherwise, 620 // assume a predicate of AL. 621 unsigned CC; 622 CC = ITBlock.getITCC(); 623 if (CC == 0xF) 624 CC = ARMCC::AL; 625 if (ITBlock.instrInITBlock()) 626 ITBlock.advanceITState(); 627 628 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; 629 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; 630 MCInst::iterator I = MI.begin(); 631 for (unsigned i = 0; i < NumOps; ++i, ++I) { 632 if (I == MI.end()) break; 633 if (OpInfo[i].isPredicate()) { 634 I = MI.insert(I, MCOperand::createImm(CC)); 635 ++I; 636 if (CC == ARMCC::AL) 637 MI.insert(I, MCOperand::createReg(0)); 638 else 639 MI.insert(I, MCOperand::createReg(ARM::CPSR)); 640 return S; 641 } 642 } 643 644 I = MI.insert(I, MCOperand::createImm(CC)); 645 ++I; 646 if (CC == ARMCC::AL) 647 MI.insert(I, MCOperand::createReg(0)); 648 else 649 MI.insert(I, MCOperand::createReg(ARM::CPSR)); 650 651 return S; 652} 653 654// Thumb VFP instructions are a special case. Because we share their 655// encodings between ARM and Thumb modes, and they are predicable in ARM 656// mode, the auto-generated decoder will give them an (incorrect) 657// predicate operand. We need to rewrite these operands based on the IT 658// context as a post-pass. 659void ThumbDisassembler::UpdateThumbVFPPredicate(MCInst &MI) const { 660 unsigned CC; 661 CC = ITBlock.getITCC(); 662 if (CC == 0xF) 663 CC = ARMCC::AL; 664 if (ITBlock.instrInITBlock()) 665 ITBlock.advanceITState(); 666 667 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() ) { 672 I->setImm(CC); 673 ++I; 674 if (CC == ARMCC::AL) 675 I->setReg(0); 676 else 677 I->setReg(ARM::CPSR); 678 return; 679 } 680 } 681} 682 683DecodeStatus ThumbDisassembler::getInstruction(MCInst &MI, uint64_t &Size, 684 ArrayRef<uint8_t> Bytes, 685 uint64_t Address, 686 raw_ostream &OS, 687 raw_ostream &CS) const { 688 CommentStream = &CS; 689 690 assert(STI.getFeatureBits()[ARM::ModeThumb] && 691 "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!"); 692 693 // We want to read exactly 2 bytes of data. 694 if (Bytes.size() < 2) { 695 Size = 0; 696 return MCDisassembler::Fail; 697 } 698 699 uint16_t Insn16 = (Bytes[1] << 8) | Bytes[0]; 700 DecodeStatus Result = 701 decodeInstruction(DecoderTableThumb16, MI, Insn16, Address, this, STI); 702 if (Result != MCDisassembler::Fail) { 703 Size = 2; 704 Check(Result, AddThumbPredicate(MI)); 705 return Result; 706 } 707 708 Result = decodeInstruction(DecoderTableThumbSBit16, MI, Insn16, Address, this, 709 STI); 710 if (Result) { 711 Size = 2; 712 bool InITBlock = ITBlock.instrInITBlock(); 713 Check(Result, AddThumbPredicate(MI)); 714 AddThumb1SBit(MI, InITBlock); 715 return Result; 716 } 717 718 Result = 719 decodeInstruction(DecoderTableThumb216, MI, Insn16, Address, this, STI); 720 if (Result != MCDisassembler::Fail) { 721 Size = 2; 722 723 // Nested IT blocks are UNPREDICTABLE. Must be checked before we add 724 // the Thumb predicate. 725 if (MI.getOpcode() == ARM::t2IT && ITBlock.instrInITBlock()) 726 Result = MCDisassembler::SoftFail; 727 728 Check(Result, AddThumbPredicate(MI)); 729 730 // If we find an IT instruction, we need to parse its condition 731 // code and mask operands so that we can apply them correctly 732 // to the subsequent instructions. 733 if (MI.getOpcode() == ARM::t2IT) { 734 unsigned Firstcond = MI.getOperand(0).getImm(); 735 unsigned Mask = MI.getOperand(1).getImm(); 736 ITBlock.setITState(Firstcond, Mask); 737 738 // An IT instruction that would give a 'NV' predicate is unpredictable. 739 if (Firstcond == ARMCC::AL && !isPowerOf2_32(Mask)) 740 CS << "unpredictable IT predicate sequence"; 741 } 742 743 return Result; 744 } 745 746 // We want to read exactly 4 bytes of data. 747 if (Bytes.size() < 4) { 748 Size = 0; 749 return MCDisassembler::Fail; 750 } 751 752 uint32_t Insn32 = 753 (Bytes[3] << 8) | (Bytes[2] << 0) | (Bytes[1] << 24) | (Bytes[0] << 16); 754 Result = 755 decodeInstruction(DecoderTableThumb32, MI, Insn32, Address, this, STI); 756 if (Result != MCDisassembler::Fail) { 757 Size = 4; 758 bool InITBlock = ITBlock.instrInITBlock(); 759 Check(Result, AddThumbPredicate(MI)); 760 AddThumb1SBit(MI, InITBlock); 761 return Result; 762 } 763 764 Result = 765 decodeInstruction(DecoderTableThumb232, MI, Insn32, Address, this, STI); 766 if (Result != MCDisassembler::Fail) { 767 Size = 4; 768 Check(Result, AddThumbPredicate(MI)); 769 return Result; 770 } 771 772 if (fieldFromInstruction(Insn32, 28, 4) == 0xE) { 773 Result = 774 decodeInstruction(DecoderTableVFP32, MI, Insn32, Address, this, STI); 775 if (Result != MCDisassembler::Fail) { 776 Size = 4; 777 UpdateThumbVFPPredicate(MI); 778 return Result; 779 } 780 } 781 782 Result = 783 decodeInstruction(DecoderTableVFPV832, MI, Insn32, Address, this, STI); 784 if (Result != MCDisassembler::Fail) { 785 Size = 4; 786 return Result; 787 } 788 789 if (fieldFromInstruction(Insn32, 28, 4) == 0xE) { 790 Result = decodeInstruction(DecoderTableNEONDup32, MI, Insn32, Address, this, 791 STI); 792 if (Result != MCDisassembler::Fail) { 793 Size = 4; 794 Check(Result, AddThumbPredicate(MI)); 795 return Result; 796 } 797 } 798 799 if (fieldFromInstruction(Insn32, 24, 8) == 0xF9) { 800 uint32_t NEONLdStInsn = Insn32; 801 NEONLdStInsn &= 0xF0FFFFFF; 802 NEONLdStInsn |= 0x04000000; 803 Result = decodeInstruction(DecoderTableNEONLoadStore32, MI, NEONLdStInsn, 804 Address, this, STI); 805 if (Result != MCDisassembler::Fail) { 806 Size = 4; 807 Check(Result, AddThumbPredicate(MI)); 808 return Result; 809 } 810 } 811 812 if (fieldFromInstruction(Insn32, 24, 4) == 0xF) { 813 uint32_t NEONDataInsn = Insn32; 814 NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24 815 NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24 816 NEONDataInsn |= 0x12000000; // Set bits 28 and 25 817 Result = decodeInstruction(DecoderTableNEONData32, MI, NEONDataInsn, 818 Address, this, STI); 819 if (Result != MCDisassembler::Fail) { 820 Size = 4; 821 Check(Result, AddThumbPredicate(MI)); 822 return Result; 823 } 824 825 uint32_t NEONCryptoInsn = Insn32; 826 NEONCryptoInsn &= 0xF0FFFFFF; // Clear bits 27-24 827 NEONCryptoInsn |= (NEONCryptoInsn & 0x10000000) >> 4; // Move bit 28 to bit 24 828 NEONCryptoInsn |= 0x12000000; // Set bits 28 and 25 829 Result = decodeInstruction(DecoderTablev8Crypto32, MI, NEONCryptoInsn, 830 Address, this, STI); 831 if (Result != MCDisassembler::Fail) { 832 Size = 4; 833 return Result; 834 } 835 836 uint32_t NEONv8Insn = Insn32; 837 NEONv8Insn &= 0xF3FFFFFF; // Clear bits 27-26 838 Result = decodeInstruction(DecoderTablev8NEON32, MI, NEONv8Insn, Address, 839 this, STI); 840 if (Result != MCDisassembler::Fail) { 841 Size = 4; 842 return Result; 843 } 844 } 845 846 Result = 847 decodeInstruction(DecoderTableThumb2CoProc32, MI, Insn32, Address, this, STI); 848 if (Result != MCDisassembler::Fail) { 849 Size = 4; 850 Check(Result, AddThumbPredicate(MI)); 851 return Result; 852 } 853 854 Size = 0; 855 return MCDisassembler::Fail; 856} 857 858extern "C" void LLVMInitializeARMDisassembler() { 859 TargetRegistry::RegisterMCDisassembler(getTheARMLETarget(), 860 createARMDisassembler); 861 TargetRegistry::RegisterMCDisassembler(getTheARMBETarget(), 862 createARMDisassembler); 863 TargetRegistry::RegisterMCDisassembler(getTheThumbLETarget(), 864 createThumbDisassembler); 865 TargetRegistry::RegisterMCDisassembler(getTheThumbBETarget(), 866 createThumbDisassembler); 867} 868 869static 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 874}; 875 876static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo, 877 uint64_t Address, const void *Decoder) { 878 if (RegNo > 15) 879 return MCDisassembler::Fail; 880 881 unsigned Register = GPRDecoderTable[RegNo]; 882 Inst.addOperand(MCOperand::createReg(Register)); 883 return MCDisassembler::Success; 884} 885 886static DecodeStatus 887DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo, 888 uint64_t Address, const void *Decoder) { 889 DecodeStatus S = MCDisassembler::Success; 890 891 if (RegNo == 15) 892 S = MCDisassembler::SoftFail; 893 894 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder)); 895 896 return S; 897} 898 899static DecodeStatus 900DecodeGPRwithAPSRRegisterClass(MCInst &Inst, unsigned RegNo, 901 uint64_t Address, const void *Decoder) { 902 DecodeStatus S = MCDisassembler::Success; 903 904 if (RegNo == 15) 905 { 906 Inst.addOperand(MCOperand::createReg(ARM::APSR_NZCV)); 907 return MCDisassembler::Success; 908 } 909 910 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder)); 911 return S; 912} 913 914static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo, 915 uint64_t Address, const void *Decoder) { 916 if (RegNo > 7) 917 return MCDisassembler::Fail; 918 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); 919} 920 921static 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 924}; 925 926static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo, 927 uint64_t Address, const void *Decoder) { 928 DecodeStatus S = MCDisassembler::Success; 929 930 if (RegNo > 13) 931 return MCDisassembler::Fail; 932 933 if ((RegNo & 1) || RegNo == 0xe) 934 S = MCDisassembler::SoftFail; 935 936 unsigned RegisterPair = GPRPairDecoderTable[RegNo/2]; 937 Inst.addOperand(MCOperand::createReg(RegisterPair)); 938 return S; 939} 940 941static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo, 942 uint64_t Address, const void *Decoder) { 943 unsigned Register = 0; 944 switch (RegNo) { 945 case 0: 946 Register = ARM::R0; 947 break; 948 case 1: 949 Register = ARM::R1; 950 break; 951 case 2: 952 Register = ARM::R2; 953 break; 954 case 3: 955 Register = ARM::R3; 956 break; 957 case 9: 958 Register = ARM::R9; 959 break; 960 case 12: 961 Register = ARM::R12; 962 break; 963 default: 964 return MCDisassembler::Fail; 965 } 966 967 Inst.addOperand(MCOperand::createReg(Register)); 968 return MCDisassembler::Success; 969} 970 971static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo, 972 uint64_t Address, const void *Decoder) { 973 DecodeStatus S = MCDisassembler::Success; 974 975 const FeatureBitset &featureBits = 976 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits(); 977 978 if ((RegNo == 13 && !featureBits[ARM::HasV8Ops]) || RegNo == 15) 979 S = MCDisassembler::SoftFail; 980 981 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder)); 982 return S; 983} 984 985static const uint16_t SPRDecoderTable[] = { 986 ARM::S0, ARM::S1, ARM::S2, ARM::S3, 987 ARM::S4, ARM::S5, ARM::S6, ARM::S7, 988 ARM::S8, ARM::S9, ARM::S10, ARM::S11, 989 ARM::S12, ARM::S13, ARM::S14, ARM::S15, 990 ARM::S16, ARM::S17, ARM::S18, ARM::S19, 991 ARM::S20, ARM::S21, ARM::S22, ARM::S23, 992 ARM::S24, ARM::S25, ARM::S26, ARM::S27, 993 ARM::S28, ARM::S29, ARM::S30, ARM::S31 994}; 995 996static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo, 997 uint64_t Address, const void *Decoder) { 998 if (RegNo > 31) 999 return MCDisassembler::Fail; 1000 1001 unsigned Register = SPRDecoderTable[RegNo]; 1002 Inst.addOperand(MCOperand::createReg(Register)); 1003 return MCDisassembler::Success; 1004} 1005 1006static DecodeStatus DecodeHPRRegisterClass(MCInst &Inst, unsigned RegNo, 1007 uint64_t Address, const void *Decoder) { 1008 return DecodeSPRRegisterClass(Inst, RegNo, Address, Decoder); 1009} 1010 1011static const uint16_t DPRDecoderTable[] = { 1012 ARM::D0, ARM::D1, ARM::D2, ARM::D3, 1013 ARM::D4, ARM::D5, ARM::D6, ARM::D7, 1014 ARM::D8, ARM::D9, ARM::D10, ARM::D11, 1015 ARM::D12, ARM::D13, ARM::D14, ARM::D15, 1016 ARM::D16, ARM::D17, ARM::D18, ARM::D19, 1017 ARM::D20, ARM::D21, ARM::D22, ARM::D23, 1018 ARM::D24, ARM::D25, ARM::D26, ARM::D27, 1019 ARM::D28, ARM::D29, ARM::D30, ARM::D31 1020}; 1021 1022static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo, 1023 uint64_t Address, const void *Decoder) { 1024 const FeatureBitset &featureBits = 1025 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits(); 1026 1027 bool hasD16 = featureBits[ARM::FeatureD16]; 1028 1029 if (RegNo > 31 || (hasD16 && RegNo > 15)) 1030 return MCDisassembler::Fail; 1031 1032 unsigned Register = DPRDecoderTable[RegNo]; 1033 Inst.addOperand(MCOperand::createReg(Register)); 1034 return MCDisassembler::Success; 1035} 1036 1037static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo, 1038 uint64_t Address, const void *Decoder) { 1039 if (RegNo > 7) 1040 return MCDisassembler::Fail; 1041 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); 1042} 1043 1044static DecodeStatus 1045DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo, 1046 uint64_t Address, const void *Decoder) { 1047 if (RegNo > 15) 1048 return MCDisassembler::Fail; 1049 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); 1050} 1051 1052static const uint16_t QPRDecoderTable[] = { 1053 ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3, 1054 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7, 1055 ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11, 1056 ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15 1057}; 1058 1059static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo, 1060 uint64_t Address, const void *Decoder) { 1061 if (RegNo > 31 || (RegNo & 1) != 0) 1062 return MCDisassembler::Fail; 1063 RegNo >>= 1; 1064 1065 unsigned Register = QPRDecoderTable[RegNo]; 1066 Inst.addOperand(MCOperand::createReg(Register)); 1067 return MCDisassembler::Success; 1068} 1069 1070static const uint16_t DPairDecoderTable[] = { 1071 ARM::Q0, ARM::D1_D2, ARM::Q1, ARM::D3_D4, ARM::Q2, ARM::D5_D6, 1072 ARM::Q3, ARM::D7_D8, ARM::Q4, ARM::D9_D10, ARM::Q5, ARM::D11_D12, 1073 ARM::Q6, ARM::D13_D14, ARM::Q7, ARM::D15_D16, ARM::Q8, ARM::D17_D18, 1074 ARM::Q9, ARM::D19_D20, ARM::Q10, ARM::D21_D22, ARM::Q11, ARM::D23_D24, 1075 ARM::Q12, ARM::D25_D26, ARM::Q13, ARM::D27_D28, ARM::Q14, ARM::D29_D30, 1076 ARM::Q15 1077}; 1078 1079static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo, 1080 uint64_t Address, const void *Decoder) { 1081 if (RegNo > 30) 1082 return MCDisassembler::Fail; 1083 1084 unsigned Register = DPairDecoderTable[RegNo]; 1085 Inst.addOperand(MCOperand::createReg(Register)); 1086 return MCDisassembler::Success; 1087} 1088 1089static const uint16_t DPairSpacedDecoderTable[] = { 1090 ARM::D0_D2, ARM::D1_D3, ARM::D2_D4, ARM::D3_D5, 1091 ARM::D4_D6, ARM::D5_D7, ARM::D6_D8, ARM::D7_D9, 1092 ARM::D8_D10, ARM::D9_D11, ARM::D10_D12, ARM::D11_D13, 1093 ARM::D12_D14, ARM::D13_D15, ARM::D14_D16, ARM::D15_D17, 1094 ARM::D16_D18, ARM::D17_D19, ARM::D18_D20, ARM::D19_D21, 1095 ARM::D20_D22, ARM::D21_D23, ARM::D22_D24, ARM::D23_D25, 1096 ARM::D24_D26, ARM::D25_D27, ARM::D26_D28, ARM::D27_D29, 1097 ARM::D28_D30, ARM::D29_D31 1098}; 1099 1100static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst &Inst, 1101 unsigned RegNo, 1102 uint64_t Address, 1103 const void *Decoder) { 1104 if (RegNo > 29) 1105 return MCDisassembler::Fail; 1106 1107 unsigned Register = DPairSpacedDecoderTable[RegNo]; 1108 Inst.addOperand(MCOperand::createReg(Register)); 1109 return MCDisassembler::Success; 1110} 1111 1112static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val, 1113 uint64_t Address, const void *Decoder) { 1114 if (Val == 0xF) return MCDisassembler::Fail; 1115 // AL predicate is not allowed on Thumb1 branches. 1116 if (Inst.getOpcode() == ARM::tBcc && Val == 0xE) 1117 return MCDisassembler::Fail; 1118 Inst.addOperand(MCOperand::createImm(Val)); 1119 if (Val == ARMCC::AL) { 1120 Inst.addOperand(MCOperand::createReg(0)); 1121 } else 1122 Inst.addOperand(MCOperand::createReg(ARM::CPSR)); 1123 return MCDisassembler::Success; 1124} 1125 1126static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val, 1127 uint64_t Address, const void *Decoder) { 1128 if (Val) 1129 Inst.addOperand(MCOperand::createReg(ARM::CPSR)); 1130 else 1131 Inst.addOperand(MCOperand::createReg(0)); 1132 return MCDisassembler::Success; 1133} 1134 1135static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Val, 1136 uint64_t Address, const void *Decoder) { 1137 DecodeStatus S = MCDisassembler::Success; 1138 1139 unsigned Rm = fieldFromInstruction(Val, 0, 4); 1140 unsigned type = fieldFromInstruction(Val, 5, 2); 1141 unsigned imm = fieldFromInstruction(Val, 7, 5); 1142 1143 // Register-immediate 1144 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) 1145 return MCDisassembler::Fail; 1146 1147 ARM_AM::ShiftOpc Shift = ARM_AM::lsl; 1148 switch (type) { 1149 case 0: 1150 Shift = ARM_AM::lsl; 1151 break; 1152 case 1: 1153 Shift = ARM_AM::lsr; 1154 break; 1155 case 2: 1156 Shift = ARM_AM::asr; 1157 break; 1158 case 3: 1159 Shift = ARM_AM::ror; 1160 break; 1161 } 1162 1163 if (Shift == ARM_AM::ror && imm == 0) 1164 Shift = ARM_AM::rrx; 1165 1166 unsigned Op = Shift | (imm << 3); 1167 Inst.addOperand(MCOperand::createImm(Op)); 1168 1169 return S; 1170} 1171 1172static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Val, 1173 uint64_t Address, const void *Decoder) { 1174 DecodeStatus S = MCDisassembler::Success; 1175 1176 unsigned Rm = fieldFromInstruction(Val, 0, 4); 1177 unsigned type = fieldFromInstruction(Val, 5, 2); 1178 unsigned Rs = fieldFromInstruction(Val, 8, 4); 1179 1180 // Register-register 1181 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1182 return MCDisassembler::Fail; 1183 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder))) 1184 return MCDisassembler::Fail; 1185 1186 ARM_AM::ShiftOpc Shift = ARM_AM::lsl; 1187 switch (type) { 1188 case 0: 1189 Shift = ARM_AM::lsl; 1190 break; 1191 case 1: 1192 Shift = ARM_AM::lsr; 1193 break; 1194 case 2: 1195 Shift = ARM_AM::asr; 1196 break; 1197 case 3: 1198 Shift = ARM_AM::ror; 1199 break; 1200 } 1201 1202 Inst.addOperand(MCOperand::createImm(Shift)); 1203 1204 return S; 1205} 1206 1207static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val, 1208 uint64_t Address, const void *Decoder) { 1209 DecodeStatus S = MCDisassembler::Success; 1210 1211 bool NeedDisjointWriteback = false; 1212 unsigned WritebackReg = 0; 1213 switch (Inst.getOpcode()) { 1214 default: 1215 break; 1216 case ARM::LDMIA_UPD: 1217 case ARM::LDMDB_UPD: 1218 case ARM::LDMIB_UPD: 1219 case ARM::LDMDA_UPD: 1220 case ARM::t2LDMIA_UPD: 1221 case ARM::t2LDMDB_UPD: 1222 case ARM::t2STMIA_UPD: 1223 case ARM::t2STMDB_UPD: 1224 NeedDisjointWriteback = true; 1225 WritebackReg = Inst.getOperand(0).getReg(); 1226 break; 1227 } 1228 1229 // Empty register lists are not allowed. 1230 if (Val == 0) return MCDisassembler::Fail; 1231 for (unsigned i = 0; i < 16; ++i) { 1232 if (Val & (1 << i)) { 1233 if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder))) 1234 return MCDisassembler::Fail; 1235 // Writeback not allowed if Rn is in the target list. 1236 if (NeedDisjointWriteback && WritebackReg == Inst.end()[-1].getReg()) 1237 Check(S, MCDisassembler::SoftFail); 1238 } 1239 } 1240 1241 return S; 1242} 1243 1244static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val, 1245 uint64_t Address, const void *Decoder) { 1246 DecodeStatus S = MCDisassembler::Success; 1247 1248 unsigned Vd = fieldFromInstruction(Val, 8, 5); 1249 unsigned regs = fieldFromInstruction(Val, 0, 8); 1250 1251 // In case of unpredictable encoding, tweak the operands. 1252 if (regs == 0 || (Vd + regs) > 32) { 1253 regs = Vd + regs > 32 ? 32 - Vd : regs; 1254 regs = std::max( 1u, regs); 1255 S = MCDisassembler::SoftFail; 1256 } 1257 1258 if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder))) 1259 return MCDisassembler::Fail; 1260 for (unsigned i = 0; i < (regs - 1); ++i) { 1261 if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder))) 1262 return MCDisassembler::Fail; 1263 } 1264 1265 return S; 1266} 1267 1268static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val, 1269 uint64_t Address, const void *Decoder) { 1270 DecodeStatus S = MCDisassembler::Success; 1271 1272 unsigned Vd = fieldFromInstruction(Val, 8, 5); 1273 unsigned regs = fieldFromInstruction(Val, 1, 7); 1274 1275 // In case of unpredictable encoding, tweak the operands. 1276 if (regs == 0 || regs > 16 || (Vd + regs) > 32) { 1277 regs = Vd + regs > 32 ? 32 - Vd : regs; 1278 regs = std::max( 1u, regs); 1279 regs = std::min(16u, regs); 1280 S = MCDisassembler::SoftFail; 1281 } 1282 1283 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder))) 1284 return MCDisassembler::Fail; 1285 for (unsigned i = 0; i < (regs - 1); ++i) { 1286 if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder))) 1287 return MCDisassembler::Fail; 1288 } 1289 1290 return S; 1291} 1292 1293static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Val, 1294 uint64_t Address, const void *Decoder) { 1295 // This operand encodes a mask of contiguous zeros between a specified MSB 1296 // and LSB. To decode it, we create the mask of all bits MSB-and-lower, 1297 // the mask of all bits LSB-and-lower, and then xor them to create 1298 // the mask of that's all ones on [msb, lsb]. Finally we not it to 1299 // create the final mask. 1300 unsigned msb = fieldFromInstruction(Val, 5, 5); 1301 unsigned lsb = fieldFromInstruction(Val, 0, 5); 1302 1303 DecodeStatus S = MCDisassembler::Success; 1304 if (lsb > msb) { 1305 Check(S, MCDisassembler::SoftFail); 1306 // The check above will cause the warning for the "potentially undefined 1307 // instruction encoding" but we can't build a bad MCOperand value here 1308 // with a lsb > msb or else printing the MCInst will cause a crash. 1309 lsb = msb; 1310 } 1311 1312 uint32_t msb_mask = 0xFFFFFFFF; 1313 if (msb != 31) msb_mask = (1U << (msb+1)) - 1; 1314 uint32_t lsb_mask = (1U << lsb) - 1; 1315 1316 Inst.addOperand(MCOperand::createImm(~(msb_mask ^ lsb_mask))); 1317 return S; 1318} 1319 1320static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn, 1321 uint64_t Address, const void *Decoder) { 1322 DecodeStatus S = MCDisassembler::Success; 1323 1324 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1325 unsigned CRd = fieldFromInstruction(Insn, 12, 4); 1326 unsigned coproc = fieldFromInstruction(Insn, 8, 4); 1327 unsigned imm = fieldFromInstruction(Insn, 0, 8); 1328 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1329 unsigned U = fieldFromInstruction(Insn, 23, 1); 1330 1331 switch (Inst.getOpcode()) { 1332 case ARM::LDC_OFFSET: 1333 case ARM::LDC_PRE: 1334 case ARM::LDC_POST: 1335 case ARM::LDC_OPTION: 1336 case ARM::LDCL_OFFSET: 1337 case ARM::LDCL_PRE: 1338 case ARM::LDCL_POST: 1339 case ARM::LDCL_OPTION: 1340 case ARM::STC_OFFSET: 1341 case ARM::STC_PRE: 1342 case ARM::STC_POST: 1343 case ARM::STC_OPTION: 1344 case ARM::STCL_OFFSET: 1345 case ARM::STCL_PRE: 1346 case ARM::STCL_POST: 1347 case ARM::STCL_OPTION: 1348 case ARM::t2LDC_OFFSET: 1349 case ARM::t2LDC_PRE: 1350 case ARM::t2LDC_POST: 1351 case ARM::t2LDC_OPTION: 1352 case ARM::t2LDCL_OFFSET: 1353 case ARM::t2LDCL_PRE: 1354 case ARM::t2LDCL_POST: 1355 case ARM::t2LDCL_OPTION: 1356 case ARM::t2STC_OFFSET: 1357 case ARM::t2STC_PRE: 1358 case ARM::t2STC_POST: 1359 case ARM::t2STC_OPTION: 1360 case ARM::t2STCL_OFFSET: 1361 case ARM::t2STCL_PRE: 1362 case ARM::t2STCL_POST: 1363 case ARM::t2STCL_OPTION: 1364 if (coproc == 0xA || coproc == 0xB) 1365 return MCDisassembler::Fail; 1366 break; 1367 default: 1368 break; 1369 } 1370 1371 const FeatureBitset &featureBits = 1372 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits(); 1373 if (featureBits[ARM::HasV8Ops] && (coproc != 14)) 1374 return MCDisassembler::Fail; 1375 1376 Inst.addOperand(MCOperand::createImm(coproc)); 1377 Inst.addOperand(MCOperand::createImm(CRd)); 1378 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1379 return MCDisassembler::Fail; 1380 1381 switch (Inst.getOpcode()) { 1382 case ARM::t2LDC2_OFFSET: 1383 case ARM::t2LDC2L_OFFSET: 1384 case ARM::t2LDC2_PRE: 1385 case ARM::t2LDC2L_PRE: 1386 case ARM::t2STC2_OFFSET: 1387 case ARM::t2STC2L_OFFSET: 1388 case ARM::t2STC2_PRE: 1389 case ARM::t2STC2L_PRE: 1390 case ARM::LDC2_OFFSET: 1391 case ARM::LDC2L_OFFSET: 1392 case ARM::LDC2_PRE: 1393 case ARM::LDC2L_PRE: 1394 case ARM::STC2_OFFSET: 1395 case ARM::STC2L_OFFSET: 1396 case ARM::STC2_PRE: 1397 case ARM::STC2L_PRE: 1398 case ARM::t2LDC_OFFSET: 1399 case ARM::t2LDCL_OFFSET: 1400 case ARM::t2LDC_PRE: 1401 case ARM::t2LDCL_PRE: 1402 case ARM::t2STC_OFFSET: 1403 case ARM::t2STCL_OFFSET: 1404 case ARM::t2STC_PRE: 1405 case ARM::t2STCL_PRE: 1406 case ARM::LDC_OFFSET: 1407 case ARM::LDCL_OFFSET: 1408 case ARM::LDC_PRE: 1409 case ARM::LDCL_PRE: 1410 case ARM::STC_OFFSET: 1411 case ARM::STCL_OFFSET: 1412 case ARM::STC_PRE: 1413 case ARM::STCL_PRE: 1414 imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm); 1415 Inst.addOperand(MCOperand::createImm(imm)); 1416 break; 1417 case ARM::t2LDC2_POST: 1418 case ARM::t2LDC2L_POST: 1419 case ARM::t2STC2_POST: 1420 case ARM::t2STC2L_POST: 1421 case ARM::LDC2_POST: 1422 case ARM::LDC2L_POST: 1423 case ARM::STC2_POST: 1424 case ARM::STC2L_POST: 1425 case ARM::t2LDC_POST: 1426 case ARM::t2LDCL_POST: 1427 case ARM::t2STC_POST: 1428 case ARM::t2STCL_POST: 1429 case ARM::LDC_POST: 1430 case ARM::LDCL_POST: 1431 case ARM::STC_POST: 1432 case ARM::STCL_POST: 1433 imm |= U << 8; 1434 LLVM_FALLTHROUGH; 1435 default: 1436 // The 'option' variant doesn't encode 'U' in the immediate since 1437 // the immediate is unsigned [0,255]. 1438 Inst.addOperand(MCOperand::createImm(imm)); 1439 break; 1440 } 1441 1442 switch (Inst.getOpcode()) { 1443 case ARM::LDC_OFFSET: 1444 case ARM::LDC_PRE: 1445 case ARM::LDC_POST: 1446 case ARM::LDC_OPTION: 1447 case ARM::LDCL_OFFSET: 1448 case ARM::LDCL_PRE: 1449 case ARM::LDCL_POST: 1450 case ARM::LDCL_OPTION: 1451 case ARM::STC_OFFSET: 1452 case ARM::STC_PRE: 1453 case ARM::STC_POST: 1454 case ARM::STC_OPTION: 1455 case ARM::STCL_OFFSET: 1456 case ARM::STCL_PRE: 1457 case ARM::STCL_POST: 1458 case ARM::STCL_OPTION: 1459 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1460 return MCDisassembler::Fail; 1461 break; 1462 default: 1463 break; 1464 } 1465 1466 return S; 1467} 1468 1469static DecodeStatus 1470DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn, 1471 uint64_t Address, const void *Decoder) { 1472 DecodeStatus S = MCDisassembler::Success; 1473 1474 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1475 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 1476 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 1477 unsigned imm = fieldFromInstruction(Insn, 0, 12); 1478 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1479 unsigned reg = fieldFromInstruction(Insn, 25, 1); 1480 unsigned P = fieldFromInstruction(Insn, 24, 1); 1481 unsigned W = fieldFromInstruction(Insn, 21, 1); 1482 1483 // On stores, the writeback operand precedes Rt. 1484 switch (Inst.getOpcode()) { 1485 case ARM::STR_POST_IMM: 1486 case ARM::STR_POST_REG: 1487 case ARM::STRB_POST_IMM: 1488 case ARM::STRB_POST_REG: 1489 case ARM::STRT_POST_REG: 1490 case ARM::STRT_POST_IMM: 1491 case ARM::STRBT_POST_REG: 1492 case ARM::STRBT_POST_IMM: 1493 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1494 return MCDisassembler::Fail; 1495 break; 1496 default: 1497 break; 1498 } 1499 1500 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 1501 return MCDisassembler::Fail; 1502 1503 // On loads, the writeback operand comes after Rt. 1504 switch (Inst.getOpcode()) { 1505 case ARM::LDR_POST_IMM: 1506 case ARM::LDR_POST_REG: 1507 case ARM::LDRB_POST_IMM: 1508 case ARM::LDRB_POST_REG: 1509 case ARM::LDRBT_POST_REG: 1510 case ARM::LDRBT_POST_IMM: 1511 case ARM::LDRT_POST_REG: 1512 case ARM::LDRT_POST_IMM: 1513 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1514 return MCDisassembler::Fail; 1515 break; 1516 default: 1517 break; 1518 } 1519 1520 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1521 return MCDisassembler::Fail; 1522 1523 ARM_AM::AddrOpc Op = ARM_AM::add; 1524 if (!fieldFromInstruction(Insn, 23, 1)) 1525 Op = ARM_AM::sub; 1526 1527 bool writeback = (P == 0) || (W == 1); 1528 unsigned idx_mode = 0; 1529 if (P && writeback) 1530 idx_mode = ARMII::IndexModePre; 1531 else if (!P && writeback) 1532 idx_mode = ARMII::IndexModePost; 1533 1534 if (writeback && (Rn == 15 || Rn == Rt)) 1535 S = MCDisassembler::SoftFail; // UNPREDICTABLE 1536 1537 if (reg) { 1538 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1539 return MCDisassembler::Fail; 1540 ARM_AM::ShiftOpc Opc = ARM_AM::lsl; 1541 switch( fieldFromInstruction(Insn, 5, 2)) { 1542 case 0: 1543 Opc = ARM_AM::lsl; 1544 break; 1545 case 1: 1546 Opc = ARM_AM::lsr; 1547 break; 1548 case 2: 1549 Opc = ARM_AM::asr; 1550 break; 1551 case 3: 1552 Opc = ARM_AM::ror; 1553 break; 1554 default: 1555 return MCDisassembler::Fail; 1556 } 1557 unsigned amt = fieldFromInstruction(Insn, 7, 5); 1558 if (Opc == ARM_AM::ror && amt == 0) 1559 Opc = ARM_AM::rrx; 1560 unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode); 1561 1562 Inst.addOperand(MCOperand::createImm(imm)); 1563 } else { 1564 Inst.addOperand(MCOperand::createReg(0)); 1565 unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode); 1566 Inst.addOperand(MCOperand::createImm(tmp)); 1567 } 1568 1569 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1570 return MCDisassembler::Fail; 1571 1572 return S; 1573} 1574 1575static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Val, 1576 uint64_t Address, const void *Decoder) { 1577 DecodeStatus S = MCDisassembler::Success; 1578 1579 unsigned Rn = fieldFromInstruction(Val, 13, 4); 1580 unsigned Rm = fieldFromInstruction(Val, 0, 4); 1581 unsigned type = fieldFromInstruction(Val, 5, 2); 1582 unsigned imm = fieldFromInstruction(Val, 7, 5); 1583 unsigned U = fieldFromInstruction(Val, 12, 1); 1584 1585 ARM_AM::ShiftOpc ShOp = ARM_AM::lsl; 1586 switch (type) { 1587 case 0: 1588 ShOp = ARM_AM::lsl; 1589 break; 1590 case 1: 1591 ShOp = ARM_AM::lsr; 1592 break; 1593 case 2: 1594 ShOp = ARM_AM::asr; 1595 break; 1596 case 3: 1597 ShOp = ARM_AM::ror; 1598 break; 1599 } 1600 1601 if (ShOp == ARM_AM::ror && imm == 0) 1602 ShOp = ARM_AM::rrx; 1603 1604 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1605 return MCDisassembler::Fail; 1606 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1607 return MCDisassembler::Fail; 1608 unsigned shift; 1609 if (U) 1610 shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp); 1611 else 1612 shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp); 1613 Inst.addOperand(MCOperand::createImm(shift)); 1614 1615 return S; 1616} 1617 1618static DecodeStatus 1619DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn, 1620 uint64_t Address, const void *Decoder) { 1621 DecodeStatus S = MCDisassembler::Success; 1622 1623 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 1624 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1625 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 1626 unsigned type = fieldFromInstruction(Insn, 22, 1); 1627 unsigned imm = fieldFromInstruction(Insn, 8, 4); 1628 unsigned U = ((~fieldFromInstruction(Insn, 23, 1)) & 1) << 8; 1629 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1630 unsigned W = fieldFromInstruction(Insn, 21, 1); 1631 unsigned P = fieldFromInstruction(Insn, 24, 1); 1632 unsigned Rt2 = Rt + 1; 1633 1634 bool writeback = (W == 1) | (P == 0); 1635 1636 // For {LD,ST}RD, Rt must be even, else undefined. 1637 switch (Inst.getOpcode()) { 1638 case ARM::STRD: 1639 case ARM::STRD_PRE: 1640 case ARM::STRD_POST: 1641 case ARM::LDRD: 1642 case ARM::LDRD_PRE: 1643 case ARM::LDRD_POST: 1644 if (Rt & 0x1) S = MCDisassembler::SoftFail; 1645 break; 1646 default: 1647 break; 1648 } 1649 switch (Inst.getOpcode()) { 1650 case ARM::STRD: 1651 case ARM::STRD_PRE: 1652 case ARM::STRD_POST: 1653 if (P == 0 && W == 1) 1654 S = MCDisassembler::SoftFail; 1655 1656 if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2)) 1657 S = MCDisassembler::SoftFail; 1658 if (type && Rm == 15) 1659 S = MCDisassembler::SoftFail; 1660 if (Rt2 == 15) 1661 S = MCDisassembler::SoftFail; 1662 if (!type && fieldFromInstruction(Insn, 8, 4)) 1663 S = MCDisassembler::SoftFail; 1664 break; 1665 case ARM::STRH: 1666 case ARM::STRH_PRE: 1667 case ARM::STRH_POST: 1668 if (Rt == 15) 1669 S = MCDisassembler::SoftFail; 1670 if (writeback && (Rn == 15 || Rn == Rt)) 1671 S = MCDisassembler::SoftFail; 1672 if (!type && Rm == 15) 1673 S = MCDisassembler::SoftFail; 1674 break; 1675 case ARM::LDRD: 1676 case ARM::LDRD_PRE: 1677 case ARM::LDRD_POST: 1678 if (type && Rn == 15) { 1679 if (Rt2 == 15) 1680 S = MCDisassembler::SoftFail; 1681 break; 1682 } 1683 if (P == 0 && W == 1) 1684 S = MCDisassembler::SoftFail; 1685 if (!type && (Rt2 == 15 || Rm == 15 || Rm == Rt || Rm == Rt2)) 1686 S = MCDisassembler::SoftFail; 1687 if (!type && writeback && Rn == 15) 1688 S = MCDisassembler::SoftFail; 1689 if (writeback && (Rn == Rt || Rn == Rt2)) 1690 S = MCDisassembler::SoftFail; 1691 break; 1692 case ARM::LDRH: 1693 case ARM::LDRH_PRE: 1694 case ARM::LDRH_POST: 1695 if (type && Rn == 15) { 1696 if (Rt == 15) 1697 S = MCDisassembler::SoftFail; 1698 break; 1699 } 1700 if (Rt == 15) 1701 S = MCDisassembler::SoftFail; 1702 if (!type && Rm == 15) 1703 S = MCDisassembler::SoftFail; 1704 if (!type && writeback && (Rn == 15 || Rn == Rt)) 1705 S = MCDisassembler::SoftFail; 1706 break; 1707 case ARM::LDRSH: 1708 case ARM::LDRSH_PRE: 1709 case ARM::LDRSH_POST: 1710 case ARM::LDRSB: 1711 case ARM::LDRSB_PRE: 1712 case ARM::LDRSB_POST: 1713 if (type && Rn == 15) { 1714 if (Rt == 15) 1715 S = MCDisassembler::SoftFail; 1716 break; 1717 } 1718 if (type && (Rt == 15 || (writeback && Rn == Rt))) 1719 S = MCDisassembler::SoftFail; 1720 if (!type && (Rt == 15 || Rm == 15)) 1721 S = MCDisassembler::SoftFail; 1722 if (!type && writeback && (Rn == 15 || Rn == Rt)) 1723 S = MCDisassembler::SoftFail; 1724 break; 1725 default: 1726 break; 1727 } 1728 1729 if (writeback) { // Writeback 1730 if (P) 1731 U |= ARMII::IndexModePre << 9; 1732 else 1733 U |= ARMII::IndexModePost << 9; 1734 1735 // On stores, the writeback operand precedes Rt. 1736 switch (Inst.getOpcode()) { 1737 case ARM::STRD: 1738 case ARM::STRD_PRE: 1739 case ARM::STRD_POST: 1740 case ARM::STRH: 1741 case ARM::STRH_PRE: 1742 case ARM::STRH_POST: 1743 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1744 return MCDisassembler::Fail; 1745 break; 1746 default: 1747 break; 1748 } 1749 } 1750 1751 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 1752 return MCDisassembler::Fail; 1753 switch (Inst.getOpcode()) { 1754 case ARM::STRD: 1755 case ARM::STRD_PRE: 1756 case ARM::STRD_POST: 1757 case ARM::LDRD: 1758 case ARM::LDRD_PRE: 1759 case ARM::LDRD_POST: 1760 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 1761 return MCDisassembler::Fail; 1762 break; 1763 default: 1764 break; 1765 } 1766 1767 if (writeback) { 1768 // On loads, the writeback operand comes after Rt. 1769 switch (Inst.getOpcode()) { 1770 case ARM::LDRD: 1771 case ARM::LDRD_PRE: 1772 case ARM::LDRD_POST: 1773 case ARM::LDRH: 1774 case ARM::LDRH_PRE: 1775 case ARM::LDRH_POST: 1776 case ARM::LDRSH: 1777 case ARM::LDRSH_PRE: 1778 case ARM::LDRSH_POST: 1779 case ARM::LDRSB: 1780 case ARM::LDRSB_PRE: 1781 case ARM::LDRSB_POST: 1782 case ARM::LDRHTr: 1783 case ARM::LDRSBTr: 1784 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1785 return MCDisassembler::Fail; 1786 break; 1787 default: 1788 break; 1789 } 1790 } 1791 1792 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1793 return MCDisassembler::Fail; 1794 1795 if (type) { 1796 Inst.addOperand(MCOperand::createReg(0)); 1797 Inst.addOperand(MCOperand::createImm(U | (imm << 4) | Rm)); 1798 } else { 1799 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1800 return MCDisassembler::Fail; 1801 Inst.addOperand(MCOperand::createImm(U)); 1802 } 1803 1804 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1805 return MCDisassembler::Fail; 1806 1807 return S; 1808} 1809 1810static DecodeStatus DecodeRFEInstruction(MCInst &Inst, unsigned Insn, 1811 uint64_t Address, const void *Decoder) { 1812 DecodeStatus S = MCDisassembler::Success; 1813 1814 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1815 unsigned mode = fieldFromInstruction(Insn, 23, 2); 1816 1817 switch (mode) { 1818 case 0: 1819 mode = ARM_AM::da; 1820 break; 1821 case 1: 1822 mode = ARM_AM::ia; 1823 break; 1824 case 2: 1825 mode = ARM_AM::db; 1826 break; 1827 case 3: 1828 mode = ARM_AM::ib; 1829 break; 1830 } 1831 1832 Inst.addOperand(MCOperand::createImm(mode)); 1833 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1834 return MCDisassembler::Fail; 1835 1836 return S; 1837} 1838 1839static DecodeStatus DecodeQADDInstruction(MCInst &Inst, unsigned Insn, 1840 uint64_t Address, const void *Decoder) { 1841 DecodeStatus S = MCDisassembler::Success; 1842 1843 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 1844 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 1845 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1846 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1847 1848 if (pred == 0xF) 1849 return DecodeCPSInstruction(Inst, Insn, Address, Decoder); 1850 1851 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) 1852 return MCDisassembler::Fail; 1853 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1854 return MCDisassembler::Fail; 1855 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 1856 return MCDisassembler::Fail; 1857 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1858 return MCDisassembler::Fail; 1859 return S; 1860} 1861 1862static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst &Inst, 1863 unsigned Insn, 1864 uint64_t Address, const void *Decoder) { 1865 DecodeStatus S = MCDisassembler::Success; 1866 1867 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1868 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1869 unsigned reglist = fieldFromInstruction(Insn, 0, 16); 1870 1871 if (pred == 0xF) { 1872 // Ambiguous with RFE and SRS 1873 switch (Inst.getOpcode()) { 1874 case ARM::LDMDA: 1875 Inst.setOpcode(ARM::RFEDA); 1876 break; 1877 case ARM::LDMDA_UPD: 1878 Inst.setOpcode(ARM::RFEDA_UPD); 1879 break; 1880 case ARM::LDMDB: 1881 Inst.setOpcode(ARM::RFEDB); 1882 break; 1883 case ARM::LDMDB_UPD: 1884 Inst.setOpcode(ARM::RFEDB_UPD); 1885 break; 1886 case ARM::LDMIA: 1887 Inst.setOpcode(ARM::RFEIA); 1888 break; 1889 case ARM::LDMIA_UPD: 1890 Inst.setOpcode(ARM::RFEIA_UPD); 1891 break; 1892 case ARM::LDMIB: 1893 Inst.setOpcode(ARM::RFEIB); 1894 break; 1895 case ARM::LDMIB_UPD: 1896 Inst.setOpcode(ARM::RFEIB_UPD); 1897 break; 1898 case ARM::STMDA: 1899 Inst.setOpcode(ARM::SRSDA); 1900 break; 1901 case ARM::STMDA_UPD: 1902 Inst.setOpcode(ARM::SRSDA_UPD); 1903 break; 1904 case ARM::STMDB: 1905 Inst.setOpcode(ARM::SRSDB); 1906 break; 1907 case ARM::STMDB_UPD: 1908 Inst.setOpcode(ARM::SRSDB_UPD); 1909 break; 1910 case ARM::STMIA: 1911 Inst.setOpcode(ARM::SRSIA); 1912 break; 1913 case ARM::STMIA_UPD: 1914 Inst.setOpcode(ARM::SRSIA_UPD); 1915 break; 1916 case ARM::STMIB: 1917 Inst.setOpcode(ARM::SRSIB); 1918 break; 1919 case ARM::STMIB_UPD: 1920 Inst.setOpcode(ARM::SRSIB_UPD); 1921 break; 1922 default: 1923 return MCDisassembler::Fail; 1924 } 1925 1926 // For stores (which become SRS's, the only operand is the mode. 1927 if (fieldFromInstruction(Insn, 20, 1) == 0) { 1928 // Check SRS encoding constraints 1929 if (!(fieldFromInstruction(Insn, 22, 1) == 1 && 1930 fieldFromInstruction(Insn, 20, 1) == 0)) 1931 return MCDisassembler::Fail; 1932 1933 Inst.addOperand( 1934 MCOperand::createImm(fieldFromInstruction(Insn, 0, 4))); 1935 return S; 1936 } 1937 1938 return DecodeRFEInstruction(Inst, Insn, Address, Decoder); 1939 } 1940 1941 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1942 return MCDisassembler::Fail; 1943 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1944 return MCDisassembler::Fail; // Tied 1945 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1946 return MCDisassembler::Fail; 1947 if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder))) 1948 return MCDisassembler::Fail; 1949 1950 return S; 1951} 1952 1953// Check for UNPREDICTABLE predicated ESB instruction 1954static DecodeStatus DecodeHINTInstruction(MCInst &Inst, unsigned Insn, 1955 uint64_t Address, const void *Decoder) { 1956 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1957 unsigned imm8 = fieldFromInstruction(Insn, 0, 8); 1958 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); 1959 const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits(); 1960 1961 DecodeStatus S = MCDisassembler::Success; 1962 1963 Inst.addOperand(MCOperand::createImm(imm8)); 1964 1965 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1966 return MCDisassembler::Fail; 1967 1968 // ESB is unpredictable if pred != AL. Without the RAS extension, it is a NOP, 1969 // so all predicates should be allowed. 1970 if (imm8 == 0x10 && pred != 0xe && ((FeatureBits[ARM::FeatureRAS]) != 0)) 1971 S = MCDisassembler::SoftFail; 1972 1973 return S; 1974} 1975 1976static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn, 1977 uint64_t Address, const void *Decoder) { 1978 unsigned imod = fieldFromInstruction(Insn, 18, 2); 1979 unsigned M = fieldFromInstruction(Insn, 17, 1); 1980 unsigned iflags = fieldFromInstruction(Insn, 6, 3); 1981 unsigned mode = fieldFromInstruction(Insn, 0, 5); 1982 1983 DecodeStatus S = MCDisassembler::Success; 1984 1985 // This decoder is called from multiple location that do not check 1986 // the full encoding is valid before they do. 1987 if (fieldFromInstruction(Insn, 5, 1) != 0 || 1988 fieldFromInstruction(Insn, 16, 1) != 0 || 1989 fieldFromInstruction(Insn, 20, 8) != 0x10) 1990 return MCDisassembler::Fail; 1991 1992 // imod == '01' --> UNPREDICTABLE 1993 // NOTE: Even though this is technically UNPREDICTABLE, we choose to 1994 // return failure here. The '01' imod value is unprintable, so there's 1995 // nothing useful we could do even if we returned UNPREDICTABLE. 1996 1997 if (imod == 1) return MCDisassembler::Fail; 1998 1999 if (imod && M) { 2000 Inst.setOpcode(ARM::CPS3p); 2001 Inst.addOperand(MCOperand::createImm(imod)); 2002 Inst.addOperand(MCOperand::createImm(iflags)); 2003 Inst.addOperand(MCOperand::createImm(mode)); 2004 } else if (imod && !M) { 2005 Inst.setOpcode(ARM::CPS2p); 2006 Inst.addOperand(MCOperand::createImm(imod)); 2007 Inst.addOperand(MCOperand::createImm(iflags)); 2008 if (mode) S = MCDisassembler::SoftFail; 2009 } else if (!imod && M) { 2010 Inst.setOpcode(ARM::CPS1p); 2011 Inst.addOperand(MCOperand::createImm(mode)); 2012 if (iflags) S = MCDisassembler::SoftFail; 2013 } else { 2014 // imod == '00' && M == '0' --> UNPREDICTABLE 2015 Inst.setOpcode(ARM::CPS1p); 2016 Inst.addOperand(MCOperand::createImm(mode)); 2017 S = MCDisassembler::SoftFail; 2018 } 2019 2020 return S; 2021} 2022 2023static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn, 2024 uint64_t Address, const void *Decoder) { 2025 unsigned imod = fieldFromInstruction(Insn, 9, 2); 2026 unsigned M = fieldFromInstruction(Insn, 8, 1); 2027 unsigned iflags = fieldFromInstruction(Insn, 5, 3); 2028 unsigned mode = fieldFromInstruction(Insn, 0, 5); 2029 2030 DecodeStatus S = MCDisassembler::Success; 2031 2032 // imod == '01' --> UNPREDICTABLE 2033 // NOTE: Even though this is technically UNPREDICTABLE, we choose to 2034 // return failure here. The '01' imod value is unprintable, so there's 2035 // nothing useful we could do even if we returned UNPREDICTABLE. 2036 2037 if (imod == 1) return MCDisassembler::Fail; 2038 2039 if (imod && M) { 2040 Inst.setOpcode(ARM::t2CPS3p); 2041 Inst.addOperand(MCOperand::createImm(imod)); 2042 Inst.addOperand(MCOperand::createImm(iflags)); 2043 Inst.addOperand(MCOperand::createImm(mode)); 2044 } else if (imod && !M) { 2045 Inst.setOpcode(ARM::t2CPS2p); 2046 Inst.addOperand(MCOperand::createImm(imod)); 2047 Inst.addOperand(MCOperand::createImm(iflags)); 2048 if (mode) S = MCDisassembler::SoftFail; 2049 } else if (!imod && M) { 2050 Inst.setOpcode(ARM::t2CPS1p); 2051 Inst.addOperand(MCOperand::createImm(mode)); 2052 if (iflags) S = MCDisassembler::SoftFail; 2053 } else { 2054 // imod == '00' && M == '0' --> this is a HINT instruction 2055 int imm = fieldFromInstruction(Insn, 0, 8); 2056 // HINT are defined only for immediate in [0..4] 2057 if(imm > 4) return MCDisassembler::Fail; 2058 Inst.setOpcode(ARM::t2HINT); 2059 Inst.addOperand(MCOperand::createImm(imm)); 2060 } 2061 2062 return S; 2063} 2064 2065static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn, 2066 uint64_t Address, const void *Decoder) { 2067 DecodeStatus S = MCDisassembler::Success; 2068 2069 unsigned Rd = fieldFromInstruction(Insn, 8, 4); 2070 unsigned imm = 0; 2071 2072 imm |= (fieldFromInstruction(Insn, 0, 8) << 0); 2073 imm |= (fieldFromInstruction(Insn, 12, 3) << 8); 2074 imm |= (fieldFromInstruction(Insn, 16, 4) << 12); 2075 imm |= (fieldFromInstruction(Insn, 26, 1) << 11); 2076 2077 if (Inst.getOpcode() == ARM::t2MOVTi16) 2078 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 2079 return MCDisassembler::Fail; 2080 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 2081 return MCDisassembler::Fail; 2082 2083 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) 2084 Inst.addOperand(MCOperand::createImm(imm)); 2085 2086 return S; 2087} 2088 2089static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn, 2090 uint64_t Address, const void *Decoder) { 2091 DecodeStatus S = MCDisassembler::Success; 2092 2093 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2094 unsigned pred = fieldFromInstruction(Insn, 28, 4); 2095 unsigned imm = 0; 2096 2097 imm |= (fieldFromInstruction(Insn, 0, 12) << 0); 2098 imm |= (fieldFromInstruction(Insn, 16, 4) << 12); 2099 2100 if (Inst.getOpcode() == ARM::MOVTi16) 2101 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) 2102 return MCDisassembler::Fail; 2103 2104 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) 2105 return MCDisassembler::Fail; 2106 2107 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) 2108 Inst.addOperand(MCOperand::createImm(imm)); 2109 2110 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 2111 return MCDisassembler::Fail; 2112 2113 return S; 2114} 2115 2116static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn, 2117 uint64_t Address, const void *Decoder) { 2118 DecodeStatus S = MCDisassembler::Success; 2119 2120 unsigned Rd = fieldFromInstruction(Insn, 16, 4); 2121 unsigned Rn = fieldFromInstruction(Insn, 0, 4); 2122 unsigned Rm = fieldFromInstruction(Insn, 8, 4); 2123 unsigned Ra = fieldFromInstruction(Insn, 12, 4); 2124 unsigned pred = fieldFromInstruction(Insn, 28, 4); 2125 2126 if (pred == 0xF) 2127 return DecodeCPSInstruction(Inst, Insn, Address, Decoder); 2128 2129 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) 2130 return MCDisassembler::Fail; 2131 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 2132 return MCDisassembler::Fail; 2133 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 2134 return MCDisassembler::Fail; 2135 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder))) 2136 return MCDisassembler::Fail; 2137 2138 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 2139 return MCDisassembler::Fail; 2140 2141 return S; 2142} 2143 2144static DecodeStatus DecodeTSTInstruction(MCInst &Inst, unsigned Insn, 2145 uint64_t Address, const void *Decoder) { 2146 DecodeStatus S = MCDisassembler::Success; 2147 2148 unsigned Pred = fieldFromInstruction(Insn, 28, 4); 2149 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2150 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2151 2152 if (Pred == 0xF) 2153 return DecodeSETPANInstruction(Inst, Insn, Address, Decoder); 2154 2155 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2156 return MCDisassembler::Fail; 2157 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2158 return MCDisassembler::Fail; 2159 if (!Check(S, DecodePredicateOperand(Inst, Pred, Address, Decoder))) 2160 return MCDisassembler::Fail; 2161 2162 return S; 2163} 2164 2165static DecodeStatus DecodeSETPANInstruction(MCInst &Inst, unsigned Insn, 2166 uint64_t Address, const void *Decoder) { 2167 DecodeStatus S = MCDisassembler::Success; 2168 2169 unsigned Imm = fieldFromInstruction(Insn, 9, 1); 2170 2171 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); 2172 const FeatureBitset &FeatureBits = Dis->getSubtargetInfo().getFeatureBits(); 2173 2174 if (!FeatureBits[ARM::HasV8_1aOps] || 2175 !FeatureBits[ARM::HasV8Ops]) 2176 return MCDisassembler::Fail; 2177 2178 // Decoder can be called from DecodeTST, which does not check the full 2179 // encoding is valid. 2180 if (fieldFromInstruction(Insn, 20,12) != 0xf11 || 2181 fieldFromInstruction(Insn, 4,4) != 0) 2182 return MCDisassembler::Fail; 2183 if (fieldFromInstruction(Insn, 10,10) != 0 || 2184 fieldFromInstruction(Insn, 0,4) != 0) 2185 S = MCDisassembler::SoftFail; 2186 2187 Inst.setOpcode(ARM::SETPAN); 2188 Inst.addOperand(MCOperand::createImm(Imm)); 2189 2190 return S; 2191} 2192 2193static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val, 2194 uint64_t Address, const void *Decoder) { 2195 DecodeStatus S = MCDisassembler::Success; 2196 2197 unsigned add = fieldFromInstruction(Val, 12, 1); 2198 unsigned imm = fieldFromInstruction(Val, 0, 12); 2199 unsigned Rn = fieldFromInstruction(Val, 13, 4); 2200 2201 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2202 return MCDisassembler::Fail; 2203 2204 if (!add) imm *= -1; 2205 if (imm == 0 && !add) imm = INT32_MIN; 2206 Inst.addOperand(MCOperand::createImm(imm)); 2207 if (Rn == 15) 2208 tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder); 2209 2210 return S; 2211} 2212 2213static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val, 2214 uint64_t Address, const void *Decoder) { 2215 DecodeStatus S = MCDisassembler::Success; 2216 2217 unsigned Rn = fieldFromInstruction(Val, 9, 4); 2218 // U == 1 to add imm, 0 to subtract it. 2219 unsigned U = fieldFromInstruction(Val, 8, 1); 2220 unsigned imm = fieldFromInstruction(Val, 0, 8); 2221 2222 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2223 return MCDisassembler::Fail; 2224 2225 if (U) 2226 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::add, imm))); 2227 else 2228 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm))); 2229 2230 return S; 2231} 2232 2233static DecodeStatus DecodeAddrMode5FP16Operand(MCInst &Inst, unsigned Val, 2234 uint64_t Address, const void *Decoder) { 2235 DecodeStatus S = MCDisassembler::Success; 2236 2237 unsigned Rn = fieldFromInstruction(Val, 9, 4); 2238 // U == 1 to add imm, 0 to subtract it. 2239 unsigned U = fieldFromInstruction(Val, 8, 1); 2240 unsigned imm = fieldFromInstruction(Val, 0, 8); 2241 2242 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2243 return MCDisassembler::Fail; 2244 2245 if (U) 2246 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::add, imm))); 2247 else 2248 Inst.addOperand(MCOperand::createImm(ARM_AM::getAM5FP16Opc(ARM_AM::sub, imm))); 2249 2250 return S; 2251} 2252 2253static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val, 2254 uint64_t Address, const void *Decoder) { 2255 return DecodeGPRRegisterClass(Inst, Val, Address, Decoder); 2256} 2257 2258static DecodeStatus 2259DecodeT2BInstruction(MCInst &Inst, unsigned Insn, 2260 uint64_t Address, const void *Decoder) { 2261 DecodeStatus Status = MCDisassembler::Success; 2262 2263 // Note the J1 and J2 values are from the encoded instruction. So here 2264 // change them to I1 and I2 values via as documented: 2265 // I1 = NOT(J1 EOR S); 2266 // I2 = NOT(J2 EOR S); 2267 // and build the imm32 with one trailing zero as documented: 2268 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32); 2269 unsigned S = fieldFromInstruction(Insn, 26, 1); 2270 unsigned J1 = fieldFromInstruction(Insn, 13, 1); 2271 unsigned J2 = fieldFromInstruction(Insn, 11, 1); 2272 unsigned I1 = !(J1 ^ S); 2273 unsigned I2 = !(J2 ^ S); 2274 unsigned imm10 = fieldFromInstruction(Insn, 16, 10); 2275 unsigned imm11 = fieldFromInstruction(Insn, 0, 11); 2276 unsigned tmp = (S << 23) | (I1 << 22) | (I2 << 21) | (imm10 << 11) | imm11; 2277 int imm32 = SignExtend32<25>(tmp << 1); 2278 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4, 2279 true, 4, Inst, Decoder)) 2280 Inst.addOperand(MCOperand::createImm(imm32)); 2281 2282 return Status; 2283} 2284 2285static DecodeStatus 2286DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn, 2287 uint64_t Address, const void *Decoder) { 2288 DecodeStatus S = MCDisassembler::Success; 2289 2290 unsigned pred = fieldFromInstruction(Insn, 28, 4); 2291 unsigned imm = fieldFromInstruction(Insn, 0, 24) << 2; 2292 2293 if (pred == 0xF) { 2294 Inst.setOpcode(ARM::BLXi); 2295 imm |= fieldFromInstruction(Insn, 24, 1) << 1; 2296 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8, 2297 true, 4, Inst, Decoder)) 2298 Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm))); 2299 return S; 2300 } 2301 2302 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8, 2303 true, 4, Inst, Decoder)) 2304 Inst.addOperand(MCOperand::createImm(SignExtend32<26>(imm))); 2305 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 2306 return MCDisassembler::Fail; 2307 2308 return S; 2309} 2310 2311static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val, 2312 uint64_t Address, const void *Decoder) { 2313 DecodeStatus S = MCDisassembler::Success; 2314 2315 unsigned Rm = fieldFromInstruction(Val, 0, 4); 2316 unsigned align = fieldFromInstruction(Val, 4, 2); 2317 2318 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2319 return MCDisassembler::Fail; 2320 if (!align) 2321 Inst.addOperand(MCOperand::createImm(0)); 2322 else 2323 Inst.addOperand(MCOperand::createImm(4 << align)); 2324 2325 return S; 2326} 2327 2328static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Insn, 2329 uint64_t Address, const void *Decoder) { 2330 DecodeStatus S = MCDisassembler::Success; 2331 2332 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2333 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2334 unsigned wb = fieldFromInstruction(Insn, 16, 4); 2335 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2336 Rn |= fieldFromInstruction(Insn, 4, 2) << 4; 2337 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2338 2339 // First output register 2340 switch (Inst.getOpcode()) { 2341 case ARM::VLD1q16: case ARM::VLD1q32: case ARM::VLD1q64: case ARM::VLD1q8: 2342 case ARM::VLD1q16wb_fixed: case ARM::VLD1q16wb_register: 2343 case ARM::VLD1q32wb_fixed: case ARM::VLD1q32wb_register: 2344 case ARM::VLD1q64wb_fixed: case ARM::VLD1q64wb_register: 2345 case ARM::VLD1q8wb_fixed: case ARM::VLD1q8wb_register: 2346 case ARM::VLD2d16: case ARM::VLD2d32: case ARM::VLD2d8: 2347 case ARM::VLD2d16wb_fixed: case ARM::VLD2d16wb_register: 2348 case ARM::VLD2d32wb_fixed: case ARM::VLD2d32wb_register: 2349 case ARM::VLD2d8wb_fixed: case ARM::VLD2d8wb_register: 2350 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) 2351 return MCDisassembler::Fail; 2352 break; 2353 case ARM::VLD2b16: 2354 case ARM::VLD2b32: 2355 case ARM::VLD2b8: 2356 case ARM::VLD2b16wb_fixed: 2357 case ARM::VLD2b16wb_register: 2358 case ARM::VLD2b32wb_fixed: 2359 case ARM::VLD2b32wb_register: 2360 case ARM::VLD2b8wb_fixed: 2361 case ARM::VLD2b8wb_register: 2362 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder))) 2363 return MCDisassembler::Fail; 2364 break; 2365 default: 2366 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2367 return MCDisassembler::Fail; 2368 } 2369 2370 // Second output register 2371 switch (Inst.getOpcode()) { 2372 case ARM::VLD3d8: 2373 case ARM::VLD3d16: 2374 case ARM::VLD3d32: 2375 case ARM::VLD3d8_UPD: 2376 case ARM::VLD3d16_UPD: 2377 case ARM::VLD3d32_UPD: 2378 case ARM::VLD4d8: 2379 case ARM::VLD4d16: 2380 case ARM::VLD4d32: 2381 case ARM::VLD4d8_UPD: 2382 case ARM::VLD4d16_UPD: 2383 case ARM::VLD4d32_UPD: 2384 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 2385 return MCDisassembler::Fail; 2386 break; 2387 case ARM::VLD3q8: 2388 case ARM::VLD3q16: 2389 case ARM::VLD3q32: 2390 case ARM::VLD3q8_UPD: 2391 case ARM::VLD3q16_UPD: 2392 case ARM::VLD3q32_UPD: 2393 case ARM::VLD4q8: 2394 case ARM::VLD4q16: 2395 case ARM::VLD4q32: 2396 case ARM::VLD4q8_UPD: 2397 case ARM::VLD4q16_UPD: 2398 case ARM::VLD4q32_UPD: 2399 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2400 return MCDisassembler::Fail; 2401 break; 2402 default: 2403 break; 2404 } 2405 2406 // Third output register 2407 switch(Inst.getOpcode()) { 2408 case ARM::VLD3d8: 2409 case ARM::VLD3d16: 2410 case ARM::VLD3d32: 2411 case ARM::VLD3d8_UPD: 2412 case ARM::VLD3d16_UPD: 2413 case ARM::VLD3d32_UPD: 2414 case ARM::VLD4d8: 2415 case ARM::VLD4d16: 2416 case ARM::VLD4d32: 2417 case ARM::VLD4d8_UPD: 2418 case ARM::VLD4d16_UPD: 2419 case ARM::VLD4d32_UPD: 2420 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2421 return MCDisassembler::Fail; 2422 break; 2423 case ARM::VLD3q8: 2424 case ARM::VLD3q16: 2425 case ARM::VLD3q32: 2426 case ARM::VLD3q8_UPD: 2427 case ARM::VLD3q16_UPD: 2428 case ARM::VLD3q32_UPD: 2429 case ARM::VLD4q8: 2430 case ARM::VLD4q16: 2431 case ARM::VLD4q32: 2432 case ARM::VLD4q8_UPD: 2433 case ARM::VLD4q16_UPD: 2434 case ARM::VLD4q32_UPD: 2435 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) 2436 return MCDisassembler::Fail; 2437 break; 2438 default: 2439 break; 2440 } 2441 2442 // Fourth output register 2443 switch (Inst.getOpcode()) { 2444 case ARM::VLD4d8: 2445 case ARM::VLD4d16: 2446 case ARM::VLD4d32: 2447 case ARM::VLD4d8_UPD: 2448 case ARM::VLD4d16_UPD: 2449 case ARM::VLD4d32_UPD: 2450 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) 2451 return MCDisassembler::Fail; 2452 break; 2453 case ARM::VLD4q8: 2454 case ARM::VLD4q16: 2455 case ARM::VLD4q32: 2456 case ARM::VLD4q8_UPD: 2457 case ARM::VLD4q16_UPD: 2458 case ARM::VLD4q32_UPD: 2459 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) 2460 return MCDisassembler::Fail; 2461 break; 2462 default: 2463 break; 2464 } 2465 2466 // Writeback operand 2467 switch (Inst.getOpcode()) { 2468 case ARM::VLD1d8wb_fixed: 2469 case ARM::VLD1d16wb_fixed: 2470 case ARM::VLD1d32wb_fixed: 2471 case ARM::VLD1d64wb_fixed: 2472 case ARM::VLD1d8wb_register: 2473 case ARM::VLD1d16wb_register: 2474 case ARM::VLD1d32wb_register: 2475 case ARM::VLD1d64wb_register: 2476 case ARM::VLD1q8wb_fixed: 2477 case ARM::VLD1q16wb_fixed: 2478 case ARM::VLD1q32wb_fixed: 2479 case ARM::VLD1q64wb_fixed: 2480 case ARM::VLD1q8wb_register: 2481 case ARM::VLD1q16wb_register: 2482 case ARM::VLD1q32wb_register: 2483 case ARM::VLD1q64wb_register: 2484 case ARM::VLD1d8Twb_fixed: 2485 case ARM::VLD1d8Twb_register: 2486 case ARM::VLD1d16Twb_fixed: 2487 case ARM::VLD1d16Twb_register: 2488 case ARM::VLD1d32Twb_fixed: 2489 case ARM::VLD1d32Twb_register: 2490 case ARM::VLD1d64Twb_fixed: 2491 case ARM::VLD1d64Twb_register: 2492 case ARM::VLD1d8Qwb_fixed: 2493 case ARM::VLD1d8Qwb_register: 2494 case ARM::VLD1d16Qwb_fixed: 2495 case ARM::VLD1d16Qwb_register: 2496 case ARM::VLD1d32Qwb_fixed: 2497 case ARM::VLD1d32Qwb_register: 2498 case ARM::VLD1d64Qwb_fixed: 2499 case ARM::VLD1d64Qwb_register: 2500 case ARM::VLD2d8wb_fixed: 2501 case ARM::VLD2d16wb_fixed: 2502 case ARM::VLD2d32wb_fixed: 2503 case ARM::VLD2q8wb_fixed: 2504 case ARM::VLD2q16wb_fixed: 2505 case ARM::VLD2q32wb_fixed: 2506 case ARM::VLD2d8wb_register: 2507 case ARM::VLD2d16wb_register: 2508 case ARM::VLD2d32wb_register: 2509 case ARM::VLD2q8wb_register: 2510 case ARM::VLD2q16wb_register: 2511 case ARM::VLD2q32wb_register: 2512 case ARM::VLD2b8wb_fixed: 2513 case ARM::VLD2b16wb_fixed: 2514 case ARM::VLD2b32wb_fixed: 2515 case ARM::VLD2b8wb_register: 2516 case ARM::VLD2b16wb_register: 2517 case ARM::VLD2b32wb_register: 2518 Inst.addOperand(MCOperand::createImm(0)); 2519 break; 2520 case ARM::VLD3d8_UPD: 2521 case ARM::VLD3d16_UPD: 2522 case ARM::VLD3d32_UPD: 2523 case ARM::VLD3q8_UPD: 2524 case ARM::VLD3q16_UPD: 2525 case ARM::VLD3q32_UPD: 2526 case ARM::VLD4d8_UPD: 2527 case ARM::VLD4d16_UPD: 2528 case ARM::VLD4d32_UPD: 2529 case ARM::VLD4q8_UPD: 2530 case ARM::VLD4q16_UPD: 2531 case ARM::VLD4q32_UPD: 2532 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) 2533 return MCDisassembler::Fail; 2534 break; 2535 default: 2536 break; 2537 } 2538 2539 // AddrMode6 Base (register+alignment) 2540 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) 2541 return MCDisassembler::Fail; 2542 2543 // AddrMode6 Offset (register) 2544 switch (Inst.getOpcode()) { 2545 default: 2546 // The below have been updated to have explicit am6offset split 2547 // between fixed and register offset. For those instructions not 2548 // yet updated, we need to add an additional reg0 operand for the 2549 // fixed variant. 2550 // 2551 // The fixed offset encodes as Rm == 0xd, so we check for that. 2552 if (Rm == 0xd) { 2553 Inst.addOperand(MCOperand::createReg(0)); 2554 break; 2555 } 2556 // Fall through to handle the register offset variant. 2557 LLVM_FALLTHROUGH; 2558 case ARM::VLD1d8wb_fixed: 2559 case ARM::VLD1d16wb_fixed: 2560 case ARM::VLD1d32wb_fixed: 2561 case ARM::VLD1d64wb_fixed: 2562 case ARM::VLD1d8Twb_fixed: 2563 case ARM::VLD1d16Twb_fixed: 2564 case ARM::VLD1d32Twb_fixed: 2565 case ARM::VLD1d64Twb_fixed: 2566 case ARM::VLD1d8Qwb_fixed: 2567 case ARM::VLD1d16Qwb_fixed: 2568 case ARM::VLD1d32Qwb_fixed: 2569 case ARM::VLD1d64Qwb_fixed: 2570 case ARM::VLD1d8wb_register: 2571 case ARM::VLD1d16wb_register: 2572 case ARM::VLD1d32wb_register: 2573 case ARM::VLD1d64wb_register: 2574 case ARM::VLD1q8wb_fixed: 2575 case ARM::VLD1q16wb_fixed: 2576 case ARM::VLD1q32wb_fixed: 2577 case ARM::VLD1q64wb_fixed: 2578 case ARM::VLD1q8wb_register: 2579 case ARM::VLD1q16wb_register: 2580 case ARM::VLD1q32wb_register: 2581 case ARM::VLD1q64wb_register: 2582 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback 2583 // variant encodes Rm == 0xf. Anything else is a register offset post- 2584 // increment and we need to add the register operand to the instruction. 2585 if (Rm != 0xD && Rm != 0xF && 2586 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2587 return MCDisassembler::Fail; 2588 break; 2589 case ARM::VLD2d8wb_fixed: 2590 case ARM::VLD2d16wb_fixed: 2591 case ARM::VLD2d32wb_fixed: 2592 case ARM::VLD2b8wb_fixed: 2593 case ARM::VLD2b16wb_fixed: 2594 case ARM::VLD2b32wb_fixed: 2595 case ARM::VLD2q8wb_fixed: 2596 case ARM::VLD2q16wb_fixed: 2597 case ARM::VLD2q32wb_fixed: 2598 break; 2599 } 2600 2601 return S; 2602} 2603 2604static DecodeStatus DecodeVLDST1Instruction(MCInst &Inst, unsigned Insn, 2605 uint64_t Address, const void *Decoder) { 2606 unsigned type = fieldFromInstruction(Insn, 8, 4); 2607 unsigned align = fieldFromInstruction(Insn, 4, 2); 2608 if (type == 6 && (align & 2)) return MCDisassembler::Fail; 2609 if (type == 7 && (align & 2)) return MCDisassembler::Fail; 2610 if (type == 10 && align == 3) return MCDisassembler::Fail; 2611 2612 unsigned load = fieldFromInstruction(Insn, 21, 1); 2613 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder) 2614 : DecodeVSTInstruction(Inst, Insn, Address, Decoder); 2615} 2616 2617static DecodeStatus DecodeVLDST2Instruction(MCInst &Inst, unsigned Insn, 2618 uint64_t Address, const void *Decoder) { 2619 unsigned size = fieldFromInstruction(Insn, 6, 2); 2620 if (size == 3) return MCDisassembler::Fail; 2621 2622 unsigned type = fieldFromInstruction(Insn, 8, 4); 2623 unsigned align = fieldFromInstruction(Insn, 4, 2); 2624 if (type == 8 && align == 3) return MCDisassembler::Fail; 2625 if (type == 9 && align == 3) return MCDisassembler::Fail; 2626 2627 unsigned load = fieldFromInstruction(Insn, 21, 1); 2628 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder) 2629 : DecodeVSTInstruction(Inst, Insn, Address, Decoder); 2630} 2631 2632static DecodeStatus DecodeVLDST3Instruction(MCInst &Inst, unsigned Insn, 2633 uint64_t Address, const void *Decoder) { 2634 unsigned size = fieldFromInstruction(Insn, 6, 2); 2635 if (size == 3) return MCDisassembler::Fail; 2636 2637 unsigned align = fieldFromInstruction(Insn, 4, 2); 2638 if (align & 2) return MCDisassembler::Fail; 2639 2640 unsigned load = fieldFromInstruction(Insn, 21, 1); 2641 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder) 2642 : DecodeVSTInstruction(Inst, Insn, Address, Decoder); 2643} 2644 2645static DecodeStatus DecodeVLDST4Instruction(MCInst &Inst, unsigned Insn, 2646 uint64_t Address, const void *Decoder) { 2647 unsigned size = fieldFromInstruction(Insn, 6, 2); 2648 if (size == 3) return MCDisassembler::Fail; 2649 2650 unsigned load = fieldFromInstruction(Insn, 21, 1); 2651 return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder) 2652 : DecodeVSTInstruction(Inst, Insn, Address, Decoder); 2653} 2654 2655static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Insn, 2656 uint64_t Address, const void *Decoder) { 2657 DecodeStatus S = MCDisassembler::Success; 2658 2659 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2660 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2661 unsigned wb = fieldFromInstruction(Insn, 16, 4); 2662 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2663 Rn |= fieldFromInstruction(Insn, 4, 2) << 4; 2664 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2665 2666 // Writeback Operand 2667 switch (Inst.getOpcode()) { 2668 case ARM::VST1d8wb_fixed: 2669 case ARM::VST1d16wb_fixed: 2670 case ARM::VST1d32wb_fixed: 2671 case ARM::VST1d64wb_fixed: 2672 case ARM::VST1d8wb_register: 2673 case ARM::VST1d16wb_register: 2674 case ARM::VST1d32wb_register: 2675 case ARM::VST1d64wb_register: 2676 case ARM::VST1q8wb_fixed: 2677 case ARM::VST1q16wb_fixed: 2678 case ARM::VST1q32wb_fixed: 2679 case ARM::VST1q64wb_fixed: 2680 case ARM::VST1q8wb_register: 2681 case ARM::VST1q16wb_register: 2682 case ARM::VST1q32wb_register: 2683 case ARM::VST1q64wb_register: 2684 case ARM::VST1d8Twb_fixed: 2685 case ARM::VST1d16Twb_fixed: 2686 case ARM::VST1d32Twb_fixed: 2687 case ARM::VST1d64Twb_fixed: 2688 case ARM::VST1d8Twb_register: 2689 case ARM::VST1d16Twb_register: 2690 case ARM::VST1d32Twb_register: 2691 case ARM::VST1d64Twb_register: 2692 case ARM::VST1d8Qwb_fixed: 2693 case ARM::VST1d16Qwb_fixed: 2694 case ARM::VST1d32Qwb_fixed: 2695 case ARM::VST1d64Qwb_fixed: 2696 case ARM::VST1d8Qwb_register: 2697 case ARM::VST1d16Qwb_register: 2698 case ARM::VST1d32Qwb_register: 2699 case ARM::VST1d64Qwb_register: 2700 case ARM::VST2d8wb_fixed: 2701 case ARM::VST2d16wb_fixed: 2702 case ARM::VST2d32wb_fixed: 2703 case ARM::VST2d8wb_register: 2704 case ARM::VST2d16wb_register: 2705 case ARM::VST2d32wb_register: 2706 case ARM::VST2q8wb_fixed: 2707 case ARM::VST2q16wb_fixed: 2708 case ARM::VST2q32wb_fixed: 2709 case ARM::VST2q8wb_register: 2710 case ARM::VST2q16wb_register: 2711 case ARM::VST2q32wb_register: 2712 case ARM::VST2b8wb_fixed: 2713 case ARM::VST2b16wb_fixed: 2714 case ARM::VST2b32wb_fixed: 2715 case ARM::VST2b8wb_register: 2716 case ARM::VST2b16wb_register: 2717 case ARM::VST2b32wb_register: 2718 if (Rm == 0xF) 2719 return MCDisassembler::Fail; 2720 Inst.addOperand(MCOperand::createImm(0)); 2721 break; 2722 case ARM::VST3d8_UPD: 2723 case ARM::VST3d16_UPD: 2724 case ARM::VST3d32_UPD: 2725 case ARM::VST3q8_UPD: 2726 case ARM::VST3q16_UPD: 2727 case ARM::VST3q32_UPD: 2728 case ARM::VST4d8_UPD: 2729 case ARM::VST4d16_UPD: 2730 case ARM::VST4d32_UPD: 2731 case ARM::VST4q8_UPD: 2732 case ARM::VST4q16_UPD: 2733 case ARM::VST4q32_UPD: 2734 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) 2735 return MCDisassembler::Fail; 2736 break; 2737 default: 2738 break; 2739 } 2740 2741 // AddrMode6 Base (register+alignment) 2742 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) 2743 return MCDisassembler::Fail; 2744 2745 // AddrMode6 Offset (register) 2746 switch (Inst.getOpcode()) { 2747 default: 2748 if (Rm == 0xD) 2749 Inst.addOperand(MCOperand::createReg(0)); 2750 else if (Rm != 0xF) { 2751 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2752 return MCDisassembler::Fail; 2753 } 2754 break; 2755 case ARM::VST1d8wb_fixed: 2756 case ARM::VST1d16wb_fixed: 2757 case ARM::VST1d32wb_fixed: 2758 case ARM::VST1d64wb_fixed: 2759 case ARM::VST1q8wb_fixed: 2760 case ARM::VST1q16wb_fixed: 2761 case ARM::VST1q32wb_fixed: 2762 case ARM::VST1q64wb_fixed: 2763 case ARM::VST1d8Twb_fixed: 2764 case ARM::VST1d16Twb_fixed: 2765 case ARM::VST1d32Twb_fixed: 2766 case ARM::VST1d64Twb_fixed: 2767 case ARM::VST1d8Qwb_fixed: 2768 case ARM::VST1d16Qwb_fixed: 2769 case ARM::VST1d32Qwb_fixed: 2770 case ARM::VST1d64Qwb_fixed: 2771 case ARM::VST2d8wb_fixed: 2772 case ARM::VST2d16wb_fixed: 2773 case ARM::VST2d32wb_fixed: 2774 case ARM::VST2q8wb_fixed: 2775 case ARM::VST2q16wb_fixed: 2776 case ARM::VST2q32wb_fixed: 2777 case ARM::VST2b8wb_fixed: 2778 case ARM::VST2b16wb_fixed: 2779 case ARM::VST2b32wb_fixed: 2780 break; 2781 } 2782 2783 // First input register 2784 switch (Inst.getOpcode()) { 2785 case ARM::VST1q16: 2786 case ARM::VST1q32: 2787 case ARM::VST1q64: 2788 case ARM::VST1q8: 2789 case ARM::VST1q16wb_fixed: 2790 case ARM::VST1q16wb_register: 2791 case ARM::VST1q32wb_fixed: 2792 case ARM::VST1q32wb_register: 2793 case ARM::VST1q64wb_fixed: 2794 case ARM::VST1q64wb_register: 2795 case ARM::VST1q8wb_fixed: 2796 case ARM::VST1q8wb_register: 2797 case ARM::VST2d16: 2798 case ARM::VST2d32: 2799 case ARM::VST2d8: 2800 case ARM::VST2d16wb_fixed: 2801 case ARM::VST2d16wb_register: 2802 case ARM::VST2d32wb_fixed: 2803 case ARM::VST2d32wb_register: 2804 case ARM::VST2d8wb_fixed: 2805 case ARM::VST2d8wb_register: 2806 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) 2807 return MCDisassembler::Fail; 2808 break; 2809 case ARM::VST2b16: 2810 case ARM::VST2b32: 2811 case ARM::VST2b8: 2812 case ARM::VST2b16wb_fixed: 2813 case ARM::VST2b16wb_register: 2814 case ARM::VST2b32wb_fixed: 2815 case ARM::VST2b32wb_register: 2816 case ARM::VST2b8wb_fixed: 2817 case ARM::VST2b8wb_register: 2818 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder))) 2819 return MCDisassembler::Fail; 2820 break; 2821 default: 2822 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2823 return MCDisassembler::Fail; 2824 } 2825 2826 // Second input register 2827 switch (Inst.getOpcode()) { 2828 case ARM::VST3d8: 2829 case ARM::VST3d16: 2830 case ARM::VST3d32: 2831 case ARM::VST3d8_UPD: 2832 case ARM::VST3d16_UPD: 2833 case ARM::VST3d32_UPD: 2834 case ARM::VST4d8: 2835 case ARM::VST4d16: 2836 case ARM::VST4d32: 2837 case ARM::VST4d8_UPD: 2838 case ARM::VST4d16_UPD: 2839 case ARM::VST4d32_UPD: 2840 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 2841 return MCDisassembler::Fail; 2842 break; 2843 case ARM::VST3q8: 2844 case ARM::VST3q16: 2845 case ARM::VST3q32: 2846 case ARM::VST3q8_UPD: 2847 case ARM::VST3q16_UPD: 2848 case ARM::VST3q32_UPD: 2849 case ARM::VST4q8: 2850 case ARM::VST4q16: 2851 case ARM::VST4q32: 2852 case ARM::VST4q8_UPD: 2853 case ARM::VST4q16_UPD: 2854 case ARM::VST4q32_UPD: 2855 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2856 return MCDisassembler::Fail; 2857 break; 2858 default: 2859 break; 2860 } 2861 2862 // Third input register 2863 switch (Inst.getOpcode()) { 2864 case ARM::VST3d8: 2865 case ARM::VST3d16: 2866 case ARM::VST3d32: 2867 case ARM::VST3d8_UPD: 2868 case ARM::VST3d16_UPD: 2869 case ARM::VST3d32_UPD: 2870 case ARM::VST4d8: 2871 case ARM::VST4d16: 2872 case ARM::VST4d32: 2873 case ARM::VST4d8_UPD: 2874 case ARM::VST4d16_UPD: 2875 case ARM::VST4d32_UPD: 2876 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2877 return MCDisassembler::Fail; 2878 break; 2879 case ARM::VST3q8: 2880 case ARM::VST3q16: 2881 case ARM::VST3q32: 2882 case ARM::VST3q8_UPD: 2883 case ARM::VST3q16_UPD: 2884 case ARM::VST3q32_UPD: 2885 case ARM::VST4q8: 2886 case ARM::VST4q16: 2887 case ARM::VST4q32: 2888 case ARM::VST4q8_UPD: 2889 case ARM::VST4q16_UPD: 2890 case ARM::VST4q32_UPD: 2891 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) 2892 return MCDisassembler::Fail; 2893 break; 2894 default: 2895 break; 2896 } 2897 2898 // Fourth input register 2899 switch (Inst.getOpcode()) { 2900 case ARM::VST4d8: 2901 case ARM::VST4d16: 2902 case ARM::VST4d32: 2903 case ARM::VST4d8_UPD: 2904 case ARM::VST4d16_UPD: 2905 case ARM::VST4d32_UPD: 2906 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) 2907 return MCDisassembler::Fail; 2908 break; 2909 case ARM::VST4q8: 2910 case ARM::VST4q16: 2911 case ARM::VST4q32: 2912 case ARM::VST4q8_UPD: 2913 case ARM::VST4q16_UPD: 2914 case ARM::VST4q32_UPD: 2915 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) 2916 return MCDisassembler::Fail; 2917 break; 2918 default: 2919 break; 2920 } 2921 2922 return S; 2923} 2924 2925static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Insn, 2926 uint64_t Address, const void *Decoder) { 2927 DecodeStatus S = MCDisassembler::Success; 2928 2929 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2930 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2931 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2932 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2933 unsigned align = fieldFromInstruction(Insn, 4, 1); 2934 unsigned size = fieldFromInstruction(Insn, 6, 2); 2935 2936 if (size == 0 && align == 1) 2937 return MCDisassembler::Fail; 2938 align *= (1 << size); 2939 2940 switch (Inst.getOpcode()) { 2941 case ARM::VLD1DUPq16: case ARM::VLD1DUPq32: case ARM::VLD1DUPq8: 2942 case ARM::VLD1DUPq16wb_fixed: case ARM::VLD1DUPq16wb_register: 2943 case ARM::VLD1DUPq32wb_fixed: case ARM::VLD1DUPq32wb_register: 2944 case ARM::VLD1DUPq8wb_fixed: case ARM::VLD1DUPq8wb_register: 2945 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) 2946 return MCDisassembler::Fail; 2947 break; 2948 default: 2949 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2950 return MCDisassembler::Fail; 2951 break; 2952 } 2953 if (Rm != 0xF) { 2954 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2955 return MCDisassembler::Fail; 2956 } 2957 2958 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2959 return MCDisassembler::Fail; 2960 Inst.addOperand(MCOperand::createImm(align)); 2961 2962 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback 2963 // variant encodes Rm == 0xf. Anything else is a register offset post- 2964 // increment and we need to add the register operand to the instruction. 2965 if (Rm != 0xD && Rm != 0xF && 2966 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2967 return MCDisassembler::Fail; 2968 2969 return S; 2970} 2971 2972static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Insn, 2973 uint64_t Address, const void *Decoder) { 2974 DecodeStatus S = MCDisassembler::Success; 2975 2976 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2977 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2978 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2979 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2980 unsigned align = fieldFromInstruction(Insn, 4, 1); 2981 unsigned size = 1 << fieldFromInstruction(Insn, 6, 2); 2982 align *= 2*size; 2983 2984 switch (Inst.getOpcode()) { 2985 case ARM::VLD2DUPd16: case ARM::VLD2DUPd32: case ARM::VLD2DUPd8: 2986 case ARM::VLD2DUPd16wb_fixed: case ARM::VLD2DUPd16wb_register: 2987 case ARM::VLD2DUPd32wb_fixed: case ARM::VLD2DUPd32wb_register: 2988 case ARM::VLD2DUPd8wb_fixed: case ARM::VLD2DUPd8wb_register: 2989 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) 2990 return MCDisassembler::Fail; 2991 break; 2992 case ARM::VLD2DUPd16x2: case ARM::VLD2DUPd32x2: case ARM::VLD2DUPd8x2: 2993 case ARM::VLD2DUPd16x2wb_fixed: case ARM::VLD2DUPd16x2wb_register: 2994 case ARM::VLD2DUPd32x2wb_fixed: case ARM::VLD2DUPd32x2wb_register: 2995 case ARM::VLD2DUPd8x2wb_fixed: case ARM::VLD2DUPd8x2wb_register: 2996 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder))) 2997 return MCDisassembler::Fail; 2998 break; 2999 default: 3000 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3001 return MCDisassembler::Fail; 3002 break; 3003 } 3004 3005 if (Rm != 0xF) 3006 Inst.addOperand(MCOperand::createImm(0)); 3007 3008 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3009 return MCDisassembler::Fail; 3010 Inst.addOperand(MCOperand::createImm(align)); 3011 3012 if (Rm != 0xD && Rm != 0xF) { 3013 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3014 return MCDisassembler::Fail; 3015 } 3016 3017 return S; 3018} 3019 3020static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Insn, 3021 uint64_t Address, const void *Decoder) { 3022 DecodeStatus S = MCDisassembler::Success; 3023 3024 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3025 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3026 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3027 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3028 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1; 3029 3030 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3031 return MCDisassembler::Fail; 3032 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 3033 return MCDisassembler::Fail; 3034 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) 3035 return MCDisassembler::Fail; 3036 if (Rm != 0xF) { 3037 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3038 return MCDisassembler::Fail; 3039 } 3040 3041 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3042 return MCDisassembler::Fail; 3043 Inst.addOperand(MCOperand::createImm(0)); 3044 3045 if (Rm == 0xD) 3046 Inst.addOperand(MCOperand::createReg(0)); 3047 else if (Rm != 0xF) { 3048 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3049 return MCDisassembler::Fail; 3050 } 3051 3052 return S; 3053} 3054 3055static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Insn, 3056 uint64_t Address, const void *Decoder) { 3057 DecodeStatus S = MCDisassembler::Success; 3058 3059 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3060 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3061 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3062 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3063 unsigned size = fieldFromInstruction(Insn, 6, 2); 3064 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1; 3065 unsigned align = fieldFromInstruction(Insn, 4, 1); 3066 3067 if (size == 0x3) { 3068 if (align == 0) 3069 return MCDisassembler::Fail; 3070 align = 16; 3071 } else { 3072 if (size == 2) { 3073 align *= 8; 3074 } else { 3075 size = 1 << size; 3076 align *= 4*size; 3077 } 3078 } 3079 3080 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3081 return MCDisassembler::Fail; 3082 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 3083 return MCDisassembler::Fail; 3084 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) 3085 return MCDisassembler::Fail; 3086 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder))) 3087 return MCDisassembler::Fail; 3088 if (Rm != 0xF) { 3089 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3090 return MCDisassembler::Fail; 3091 } 3092 3093 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3094 return MCDisassembler::Fail; 3095 Inst.addOperand(MCOperand::createImm(align)); 3096 3097 if (Rm == 0xD) 3098 Inst.addOperand(MCOperand::createReg(0)); 3099 else if (Rm != 0xF) { 3100 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3101 return MCDisassembler::Fail; 3102 } 3103 3104 return S; 3105} 3106 3107static DecodeStatus 3108DecodeNEONModImmInstruction(MCInst &Inst, unsigned Insn, 3109 uint64_t Address, const void *Decoder) { 3110 DecodeStatus S = MCDisassembler::Success; 3111 3112 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3113 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3114 unsigned imm = fieldFromInstruction(Insn, 0, 4); 3115 imm |= fieldFromInstruction(Insn, 16, 3) << 4; 3116 imm |= fieldFromInstruction(Insn, 24, 1) << 7; 3117 imm |= fieldFromInstruction(Insn, 8, 4) << 8; 3118 imm |= fieldFromInstruction(Insn, 5, 1) << 12; 3119 unsigned Q = fieldFromInstruction(Insn, 6, 1); 3120 3121 if (Q) { 3122 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 3123 return MCDisassembler::Fail; 3124 } else { 3125 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3126 return MCDisassembler::Fail; 3127 } 3128 3129 Inst.addOperand(MCOperand::createImm(imm)); 3130 3131 switch (Inst.getOpcode()) { 3132 case ARM::VORRiv4i16: 3133 case ARM::VORRiv2i32: 3134 case ARM::VBICiv4i16: 3135 case ARM::VBICiv2i32: 3136 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3137 return MCDisassembler::Fail; 3138 break; 3139 case ARM::VORRiv8i16: 3140 case ARM::VORRiv4i32: 3141 case ARM::VBICiv8i16: 3142 case ARM::VBICiv4i32: 3143 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 3144 return MCDisassembler::Fail; 3145 break; 3146 default: 3147 break; 3148 } 3149 3150 return S; 3151} 3152 3153static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Insn, 3154 uint64_t Address, const void *Decoder) { 3155 DecodeStatus S = MCDisassembler::Success; 3156 3157 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3158 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3159 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3160 Rm |= fieldFromInstruction(Insn, 5, 1) << 4; 3161 unsigned size = fieldFromInstruction(Insn, 18, 2); 3162 3163 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 3164 return MCDisassembler::Fail; 3165 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) 3166 return MCDisassembler::Fail; 3167 Inst.addOperand(MCOperand::createImm(8 << size)); 3168 3169 return S; 3170} 3171 3172static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val, 3173 uint64_t Address, const void *Decoder) { 3174 Inst.addOperand(MCOperand::createImm(8 - Val)); 3175 return MCDisassembler::Success; 3176} 3177 3178static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val, 3179 uint64_t Address, const void *Decoder) { 3180 Inst.addOperand(MCOperand::createImm(16 - Val)); 3181 return MCDisassembler::Success; 3182} 3183 3184static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val, 3185 uint64_t Address, const void *Decoder) { 3186 Inst.addOperand(MCOperand::createImm(32 - Val)); 3187 return MCDisassembler::Success; 3188} 3189 3190static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val, 3191 uint64_t Address, const void *Decoder) { 3192 Inst.addOperand(MCOperand::createImm(64 - Val)); 3193 return MCDisassembler::Success; 3194} 3195 3196static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn, 3197 uint64_t Address, const void *Decoder) { 3198 DecodeStatus S = MCDisassembler::Success; 3199 3200 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3201 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3202 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3203 Rn |= fieldFromInstruction(Insn, 7, 1) << 4; 3204 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3205 Rm |= fieldFromInstruction(Insn, 5, 1) << 4; 3206 unsigned op = fieldFromInstruction(Insn, 6, 1); 3207 3208 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3209 return MCDisassembler::Fail; 3210 if (op) { 3211 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3212 return MCDisassembler::Fail; // Writeback 3213 } 3214 3215 switch (Inst.getOpcode()) { 3216 case ARM::VTBL2: 3217 case ARM::VTBX2: 3218 if (!Check(S, DecodeDPairRegisterClass(Inst, Rn, Address, Decoder))) 3219 return MCDisassembler::Fail; 3220 break; 3221 default: 3222 if (!Check(S, DecodeDPRRegisterClass(Inst, Rn, Address, Decoder))) 3223 return MCDisassembler::Fail; 3224 } 3225 3226 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) 3227 return MCDisassembler::Fail; 3228 3229 return S; 3230} 3231 3232static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn, 3233 uint64_t Address, const void *Decoder) { 3234 DecodeStatus S = MCDisassembler::Success; 3235 3236 unsigned dst = fieldFromInstruction(Insn, 8, 3); 3237 unsigned imm = fieldFromInstruction(Insn, 0, 8); 3238 3239 if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder))) 3240 return MCDisassembler::Fail; 3241 3242 switch(Inst.getOpcode()) { 3243 default: 3244 return MCDisassembler::Fail; 3245 case ARM::tADR: 3246 break; // tADR does not explicitly represent the PC as an operand. 3247 case ARM::tADDrSPi: 3248 Inst.addOperand(MCOperand::createReg(ARM::SP)); 3249 break; 3250 } 3251 3252 Inst.addOperand(MCOperand::createImm(imm)); 3253 return S; 3254} 3255 3256static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val, 3257 uint64_t Address, const void *Decoder) { 3258 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<12>(Val<<1) + 4, 3259 true, 2, Inst, Decoder)) 3260 Inst.addOperand(MCOperand::createImm(SignExtend32<12>(Val << 1))); 3261 return MCDisassembler::Success; 3262} 3263 3264static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val, 3265 uint64_t Address, const void *Decoder) { 3266 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<21>(Val) + 4, 3267 true, 4, Inst, Decoder)) 3268 Inst.addOperand(MCOperand::createImm(SignExtend32<21>(Val))); 3269 return MCDisassembler::Success; 3270} 3271 3272static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val, 3273 uint64_t Address, const void *Decoder) { 3274 if (!tryAddingSymbolicOperand(Address, Address + (Val<<1) + 4, 3275 true, 2, Inst, Decoder)) 3276 Inst.addOperand(MCOperand::createImm(Val << 1)); 3277 return MCDisassembler::Success; 3278} 3279 3280static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val, 3281 uint64_t Address, const void *Decoder) { 3282 DecodeStatus S = MCDisassembler::Success; 3283 3284 unsigned Rn = fieldFromInstruction(Val, 0, 3); 3285 unsigned Rm = fieldFromInstruction(Val, 3, 3); 3286 3287 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) 3288 return MCDisassembler::Fail; 3289 if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder))) 3290 return MCDisassembler::Fail; 3291 3292 return S; 3293} 3294 3295static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val, 3296 uint64_t Address, const void *Decoder) { 3297 DecodeStatus S = MCDisassembler::Success; 3298 3299 unsigned Rn = fieldFromInstruction(Val, 0, 3); 3300 unsigned imm = fieldFromInstruction(Val, 3, 5); 3301 3302 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) 3303 return MCDisassembler::Fail; 3304 Inst.addOperand(MCOperand::createImm(imm)); 3305 3306 return S; 3307} 3308 3309static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val, 3310 uint64_t Address, const void *Decoder) { 3311 unsigned imm = Val << 2; 3312 3313 Inst.addOperand(MCOperand::createImm(imm)); 3314 tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder); 3315 3316 return MCDisassembler::Success; 3317} 3318 3319static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val, 3320 uint64_t Address, const void *Decoder) { 3321 Inst.addOperand(MCOperand::createReg(ARM::SP)); 3322 Inst.addOperand(MCOperand::createImm(Val)); 3323 3324 return MCDisassembler::Success; 3325} 3326 3327static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val, 3328 uint64_t Address, const void *Decoder) { 3329 DecodeStatus S = MCDisassembler::Success; 3330 3331 unsigned Rn = fieldFromInstruction(Val, 6, 4); 3332 unsigned Rm = fieldFromInstruction(Val, 2, 4); 3333 unsigned imm = fieldFromInstruction(Val, 0, 2); 3334 3335 // Thumb stores cannot use PC as dest register. 3336 switch (Inst.getOpcode()) { 3337 case ARM::t2STRHs: 3338 case ARM::t2STRBs: 3339 case ARM::t2STRs: 3340 if (Rn == 15) 3341 return MCDisassembler::Fail; 3342 break; 3343 default: 3344 break; 3345 } 3346 3347 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3348 return MCDisassembler::Fail; 3349 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) 3350 return MCDisassembler::Fail; 3351 Inst.addOperand(MCOperand::createImm(imm)); 3352 3353 return S; 3354} 3355 3356static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Insn, 3357 uint64_t Address, const void *Decoder) { 3358 DecodeStatus S = MCDisassembler::Success; 3359 3360 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3361 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3362 3363 const FeatureBitset &featureBits = 3364 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits(); 3365 3366 bool hasMP = featureBits[ARM::FeatureMP]; 3367 bool hasV7Ops = featureBits[ARM::HasV7Ops]; 3368 3369 if (Rn == 15) { 3370 switch (Inst.getOpcode()) { 3371 case ARM::t2LDRBs: 3372 Inst.setOpcode(ARM::t2LDRBpci); 3373 break; 3374 case ARM::t2LDRHs: 3375 Inst.setOpcode(ARM::t2LDRHpci); 3376 break; 3377 case ARM::t2LDRSHs: 3378 Inst.setOpcode(ARM::t2LDRSHpci); 3379 break; 3380 case ARM::t2LDRSBs: 3381 Inst.setOpcode(ARM::t2LDRSBpci); 3382 break; 3383 case ARM::t2LDRs: 3384 Inst.setOpcode(ARM::t2LDRpci); 3385 break; 3386 case ARM::t2PLDs: 3387 Inst.setOpcode(ARM::t2PLDpci); 3388 break; 3389 case ARM::t2PLIs: 3390 Inst.setOpcode(ARM::t2PLIpci); 3391 break; 3392 default: 3393 return MCDisassembler::Fail; 3394 } 3395 3396 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); 3397 } 3398 3399 if (Rt == 15) { 3400 switch (Inst.getOpcode()) { 3401 case ARM::t2LDRSHs: 3402 return MCDisassembler::Fail; 3403 case ARM::t2LDRHs: 3404 Inst.setOpcode(ARM::t2PLDWs); 3405 break; 3406 case ARM::t2LDRSBs: 3407 Inst.setOpcode(ARM::t2PLIs); 3408 break; 3409 default: 3410 break; 3411 } 3412 } 3413 3414 switch (Inst.getOpcode()) { 3415 case ARM::t2PLDs: 3416 break; 3417 case ARM::t2PLIs: 3418 if (!hasV7Ops) 3419 return MCDisassembler::Fail; 3420 break; 3421 case ARM::t2PLDWs: 3422 if (!hasV7Ops || !hasMP) 3423 return MCDisassembler::Fail; 3424 break; 3425 default: 3426 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3427 return MCDisassembler::Fail; 3428 } 3429 3430 unsigned addrmode = fieldFromInstruction(Insn, 4, 2); 3431 addrmode |= fieldFromInstruction(Insn, 0, 4) << 2; 3432 addrmode |= fieldFromInstruction(Insn, 16, 4) << 6; 3433 if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder))) 3434 return MCDisassembler::Fail; 3435 3436 return S; 3437} 3438 3439static DecodeStatus DecodeT2LoadImm8(MCInst &Inst, unsigned Insn, 3440 uint64_t Address, const void* Decoder) { 3441 DecodeStatus S = MCDisassembler::Success; 3442 3443 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3444 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3445 unsigned U = fieldFromInstruction(Insn, 9, 1); 3446 unsigned imm = fieldFromInstruction(Insn, 0, 8); 3447 imm |= (U << 8); 3448 imm |= (Rn << 9); 3449 unsigned add = fieldFromInstruction(Insn, 9, 1); 3450 3451 const FeatureBitset &featureBits = 3452 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits(); 3453 3454 bool hasMP = featureBits[ARM::FeatureMP]; 3455 bool hasV7Ops = featureBits[ARM::HasV7Ops]; 3456 3457 if (Rn == 15) { 3458 switch (Inst.getOpcode()) { 3459 case ARM::t2LDRi8: 3460 Inst.setOpcode(ARM::t2LDRpci); 3461 break; 3462 case ARM::t2LDRBi8: 3463 Inst.setOpcode(ARM::t2LDRBpci); 3464 break; 3465 case ARM::t2LDRSBi8: 3466 Inst.setOpcode(ARM::t2LDRSBpci); 3467 break; 3468 case ARM::t2LDRHi8: 3469 Inst.setOpcode(ARM::t2LDRHpci); 3470 break; 3471 case ARM::t2LDRSHi8: 3472 Inst.setOpcode(ARM::t2LDRSHpci); 3473 break; 3474 case ARM::t2PLDi8: 3475 Inst.setOpcode(ARM::t2PLDpci); 3476 break; 3477 case ARM::t2PLIi8: 3478 Inst.setOpcode(ARM::t2PLIpci); 3479 break; 3480 default: 3481 return MCDisassembler::Fail; 3482 } 3483 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); 3484 } 3485 3486 if (Rt == 15) { 3487 switch (Inst.getOpcode()) { 3488 case ARM::t2LDRSHi8: 3489 return MCDisassembler::Fail; 3490 case ARM::t2LDRHi8: 3491 if (!add) 3492 Inst.setOpcode(ARM::t2PLDWi8); 3493 break; 3494 case ARM::t2LDRSBi8: 3495 Inst.setOpcode(ARM::t2PLIi8); 3496 break; 3497 default: 3498 break; 3499 } 3500 } 3501 3502 switch (Inst.getOpcode()) { 3503 case ARM::t2PLDi8: 3504 break; 3505 case ARM::t2PLIi8: 3506 if (!hasV7Ops) 3507 return MCDisassembler::Fail; 3508 break; 3509 case ARM::t2PLDWi8: 3510 if (!hasV7Ops || !hasMP) 3511 return MCDisassembler::Fail; 3512 break; 3513 default: 3514 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3515 return MCDisassembler::Fail; 3516 } 3517 3518 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder))) 3519 return MCDisassembler::Fail; 3520 return S; 3521} 3522 3523static DecodeStatus DecodeT2LoadImm12(MCInst &Inst, unsigned Insn, 3524 uint64_t Address, const void* Decoder) { 3525 DecodeStatus S = MCDisassembler::Success; 3526 3527 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3528 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3529 unsigned imm = fieldFromInstruction(Insn, 0, 12); 3530 imm |= (Rn << 13); 3531 3532 const FeatureBitset &featureBits = 3533 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits(); 3534 3535 bool hasMP = featureBits[ARM::FeatureMP]; 3536 bool hasV7Ops = featureBits[ARM::HasV7Ops]; 3537 3538 if (Rn == 15) { 3539 switch (Inst.getOpcode()) { 3540 case ARM::t2LDRi12: 3541 Inst.setOpcode(ARM::t2LDRpci); 3542 break; 3543 case ARM::t2LDRHi12: 3544 Inst.setOpcode(ARM::t2LDRHpci); 3545 break; 3546 case ARM::t2LDRSHi12: 3547 Inst.setOpcode(ARM::t2LDRSHpci); 3548 break; 3549 case ARM::t2LDRBi12: 3550 Inst.setOpcode(ARM::t2LDRBpci); 3551 break; 3552 case ARM::t2LDRSBi12: 3553 Inst.setOpcode(ARM::t2LDRSBpci); 3554 break; 3555 case ARM::t2PLDi12: 3556 Inst.setOpcode(ARM::t2PLDpci); 3557 break; 3558 case ARM::t2PLIi12: 3559 Inst.setOpcode(ARM::t2PLIpci); 3560 break; 3561 default: 3562 return MCDisassembler::Fail; 3563 } 3564 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); 3565 } 3566 3567 if (Rt == 15) { 3568 switch (Inst.getOpcode()) { 3569 case ARM::t2LDRSHi12: 3570 return MCDisassembler::Fail; 3571 case ARM::t2LDRHi12: 3572 Inst.setOpcode(ARM::t2PLDWi12); 3573 break; 3574 case ARM::t2LDRSBi12: 3575 Inst.setOpcode(ARM::t2PLIi12); 3576 break; 3577 default: 3578 break; 3579 } 3580 } 3581 3582 switch (Inst.getOpcode()) { 3583 case ARM::t2PLDi12: 3584 break; 3585 case ARM::t2PLIi12: 3586 if (!hasV7Ops) 3587 return MCDisassembler::Fail; 3588 break; 3589 case ARM::t2PLDWi12: 3590 if (!hasV7Ops || !hasMP) 3591 return MCDisassembler::Fail; 3592 break; 3593 default: 3594 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3595 return MCDisassembler::Fail; 3596 } 3597 3598 if (!Check(S, DecodeT2AddrModeImm12(Inst, imm, Address, Decoder))) 3599 return MCDisassembler::Fail; 3600 return S; 3601} 3602 3603static DecodeStatus DecodeT2LoadT(MCInst &Inst, unsigned Insn, 3604 uint64_t Address, const void* Decoder) { 3605 DecodeStatus S = MCDisassembler::Success; 3606 3607 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3608 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3609 unsigned imm = fieldFromInstruction(Insn, 0, 8); 3610 imm |= (Rn << 9); 3611 3612 if (Rn == 15) { 3613 switch (Inst.getOpcode()) { 3614 case ARM::t2LDRT: 3615 Inst.setOpcode(ARM::t2LDRpci); 3616 break; 3617 case ARM::t2LDRBT: 3618 Inst.setOpcode(ARM::t2LDRBpci); 3619 break; 3620 case ARM::t2LDRHT: 3621 Inst.setOpcode(ARM::t2LDRHpci); 3622 break; 3623 case ARM::t2LDRSBT: 3624 Inst.setOpcode(ARM::t2LDRSBpci); 3625 break; 3626 case ARM::t2LDRSHT: 3627 Inst.setOpcode(ARM::t2LDRSHpci); 3628 break; 3629 default: 3630 return MCDisassembler::Fail; 3631 } 3632 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); 3633 } 3634 3635 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 3636 return MCDisassembler::Fail; 3637 if (!Check(S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder))) 3638 return MCDisassembler::Fail; 3639 return S; 3640} 3641 3642static DecodeStatus DecodeT2LoadLabel(MCInst &Inst, unsigned Insn, 3643 uint64_t Address, const void* Decoder) { 3644 DecodeStatus S = MCDisassembler::Success; 3645 3646 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3647 unsigned U = fieldFromInstruction(Insn, 23, 1); 3648 int imm = fieldFromInstruction(Insn, 0, 12); 3649 3650 const FeatureBitset &featureBits = 3651 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits(); 3652 3653 bool hasV7Ops = featureBits[ARM::HasV7Ops]; 3654 3655 if (Rt == 15) { 3656 switch (Inst.getOpcode()) { 3657 case ARM::t2LDRBpci: 3658 case ARM::t2LDRHpci: 3659 Inst.setOpcode(ARM::t2PLDpci); 3660 break; 3661 case ARM::t2LDRSBpci: 3662 Inst.setOpcode(ARM::t2PLIpci); 3663 break; 3664 case ARM::t2LDRSHpci: 3665 return MCDisassembler::Fail; 3666 default: 3667 break; 3668 } 3669 } 3670 3671 switch(Inst.getOpcode()) { 3672 case ARM::t2PLDpci: 3673 break; 3674 case ARM::t2PLIpci: 3675 if (!hasV7Ops) 3676 return MCDisassembler::Fail; 3677 break; 3678 default: 3679 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3680 return MCDisassembler::Fail; 3681 } 3682 3683 if (!U) { 3684 // Special case for #-0. 3685 if (imm == 0) 3686 imm = INT32_MIN; 3687 else 3688 imm = -imm; 3689 } 3690 Inst.addOperand(MCOperand::createImm(imm)); 3691 3692 return S; 3693} 3694 3695static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val, 3696 uint64_t Address, const void *Decoder) { 3697 if (Val == 0) 3698 Inst.addOperand(MCOperand::createImm(INT32_MIN)); 3699 else { 3700 int imm = Val & 0xFF; 3701 3702 if (!(Val & 0x100)) imm *= -1; 3703 Inst.addOperand(MCOperand::createImm(imm * 4)); 3704 } 3705 3706 return MCDisassembler::Success; 3707} 3708 3709static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val, 3710 uint64_t Address, const void *Decoder) { 3711 DecodeStatus S = MCDisassembler::Success; 3712 3713 unsigned Rn = fieldFromInstruction(Val, 9, 4); 3714 unsigned imm = fieldFromInstruction(Val, 0, 9); 3715 3716 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3717 return MCDisassembler::Fail; 3718 if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder))) 3719 return MCDisassembler::Fail; 3720 3721 return S; 3722} 3723 3724static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val, 3725 uint64_t Address, const void *Decoder) { 3726 DecodeStatus S = MCDisassembler::Success; 3727 3728 unsigned Rn = fieldFromInstruction(Val, 8, 4); 3729 unsigned imm = fieldFromInstruction(Val, 0, 8); 3730 3731 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 3732 return MCDisassembler::Fail; 3733 3734 Inst.addOperand(MCOperand::createImm(imm)); 3735 3736 return S; 3737} 3738 3739static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val, 3740 uint64_t Address, const void *Decoder) { 3741 int imm = Val & 0xFF; 3742 if (Val == 0) 3743 imm = INT32_MIN; 3744 else if (!(Val & 0x100)) 3745 imm *= -1; 3746 Inst.addOperand(MCOperand::createImm(imm)); 3747 3748 return MCDisassembler::Success; 3749} 3750 3751static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val, 3752 uint64_t Address, const void *Decoder) { 3753 DecodeStatus S = MCDisassembler::Success; 3754 3755 unsigned Rn = fieldFromInstruction(Val, 9, 4); 3756 unsigned imm = fieldFromInstruction(Val, 0, 9); 3757 3758 // Thumb stores cannot use PC as dest register. 3759 switch (Inst.getOpcode()) { 3760 case ARM::t2STRT: 3761 case ARM::t2STRBT: 3762 case ARM::t2STRHT: 3763 case ARM::t2STRi8: 3764 case ARM::t2STRHi8: 3765 case ARM::t2STRBi8: 3766 if (Rn == 15) 3767 return MCDisassembler::Fail; 3768 break; 3769 default: 3770 break; 3771 } 3772 3773 // Some instructions always use an additive offset. 3774 switch (Inst.getOpcode()) { 3775 case ARM::t2LDRT: 3776 case ARM::t2LDRBT: 3777 case ARM::t2LDRHT: 3778 case ARM::t2LDRSBT: 3779 case ARM::t2LDRSHT: 3780 case ARM::t2STRT: 3781 case ARM::t2STRBT: 3782 case ARM::t2STRHT: 3783 imm |= 0x100; 3784 break; 3785 default: 3786 break; 3787 } 3788 3789 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3790 return MCDisassembler::Fail; 3791 if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder))) 3792 return MCDisassembler::Fail; 3793 3794 return S; 3795} 3796 3797static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Insn, 3798 uint64_t Address, const void *Decoder) { 3799 DecodeStatus S = MCDisassembler::Success; 3800 3801 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3802 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3803 unsigned addr = fieldFromInstruction(Insn, 0, 8); 3804 addr |= fieldFromInstruction(Insn, 9, 1) << 8; 3805 addr |= Rn << 9; 3806 unsigned load = fieldFromInstruction(Insn, 20, 1); 3807 3808 if (Rn == 15) { 3809 switch (Inst.getOpcode()) { 3810 case ARM::t2LDR_PRE: 3811 case ARM::t2LDR_POST: 3812 Inst.setOpcode(ARM::t2LDRpci); 3813 break; 3814 case ARM::t2LDRB_PRE: 3815 case ARM::t2LDRB_POST: 3816 Inst.setOpcode(ARM::t2LDRBpci); 3817 break; 3818 case ARM::t2LDRH_PRE: 3819 case ARM::t2LDRH_POST: 3820 Inst.setOpcode(ARM::t2LDRHpci); 3821 break; 3822 case ARM::t2LDRSB_PRE: 3823 case ARM::t2LDRSB_POST: 3824 if (Rt == 15) 3825 Inst.setOpcode(ARM::t2PLIpci); 3826 else 3827 Inst.setOpcode(ARM::t2LDRSBpci); 3828 break; 3829 case ARM::t2LDRSH_PRE: 3830 case ARM::t2LDRSH_POST: 3831 Inst.setOpcode(ARM::t2LDRSHpci); 3832 break; 3833 default: 3834 return MCDisassembler::Fail; 3835 } 3836 return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); 3837 } 3838 3839 if (!load) { 3840 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3841 return MCDisassembler::Fail; 3842 } 3843 3844 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3845 return MCDisassembler::Fail; 3846 3847 if (load) { 3848 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3849 return MCDisassembler::Fail; 3850 } 3851 3852 if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder))) 3853 return MCDisassembler::Fail; 3854 3855 return S; 3856} 3857 3858static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val, 3859 uint64_t Address, const void *Decoder) { 3860 DecodeStatus S = MCDisassembler::Success; 3861 3862 unsigned Rn = fieldFromInstruction(Val, 13, 4); 3863 unsigned imm = fieldFromInstruction(Val, 0, 12); 3864 3865 // Thumb stores cannot use PC as dest register. 3866 switch (Inst.getOpcode()) { 3867 case ARM::t2STRi12: 3868 case ARM::t2STRBi12: 3869 case ARM::t2STRHi12: 3870 if (Rn == 15) 3871 return MCDisassembler::Fail; 3872 break; 3873 default: 3874 break; 3875 } 3876 3877 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3878 return MCDisassembler::Fail; 3879 Inst.addOperand(MCOperand::createImm(imm)); 3880 3881 return S; 3882} 3883 3884static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Insn, 3885 uint64_t Address, const void *Decoder) { 3886 unsigned imm = fieldFromInstruction(Insn, 0, 7); 3887 3888 Inst.addOperand(MCOperand::createReg(ARM::SP)); 3889 Inst.addOperand(MCOperand::createReg(ARM::SP)); 3890 Inst.addOperand(MCOperand::createImm(imm)); 3891 3892 return MCDisassembler::Success; 3893} 3894 3895static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn, 3896 uint64_t Address, const void *Decoder) { 3897 DecodeStatus S = MCDisassembler::Success; 3898 3899 if (Inst.getOpcode() == ARM::tADDrSP) { 3900 unsigned Rdm = fieldFromInstruction(Insn, 0, 3); 3901 Rdm |= fieldFromInstruction(Insn, 7, 1) << 3; 3902 3903 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) 3904 return MCDisassembler::Fail; 3905 Inst.addOperand(MCOperand::createReg(ARM::SP)); 3906 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) 3907 return MCDisassembler::Fail; 3908 } else if (Inst.getOpcode() == ARM::tADDspr) { 3909 unsigned Rm = fieldFromInstruction(Insn, 3, 4); 3910 3911 Inst.addOperand(MCOperand::createReg(ARM::SP)); 3912 Inst.addOperand(MCOperand::createReg(ARM::SP)); 3913 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3914 return MCDisassembler::Fail; 3915 } 3916 3917 return S; 3918} 3919 3920static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn, 3921 uint64_t Address, const void *Decoder) { 3922 unsigned imod = fieldFromInstruction(Insn, 4, 1) | 0x2; 3923 unsigned flags = fieldFromInstruction(Insn, 0, 3); 3924 3925 Inst.addOperand(MCOperand::createImm(imod)); 3926 Inst.addOperand(MCOperand::createImm(flags)); 3927 3928 return MCDisassembler::Success; 3929} 3930 3931static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn, 3932 uint64_t Address, const void *Decoder) { 3933 DecodeStatus S = MCDisassembler::Success; 3934 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3935 unsigned add = fieldFromInstruction(Insn, 4, 1); 3936 3937 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 3938 return MCDisassembler::Fail; 3939 Inst.addOperand(MCOperand::createImm(add)); 3940 3941 return S; 3942} 3943 3944static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Val, 3945 uint64_t Address, const void *Decoder) { 3946 // Val is passed in as S:J1:J2:imm10H:imm10L:'0' 3947 // Note only one trailing zero not two. Also the J1 and J2 values are from 3948 // the encoded instruction. So here change to I1 and I2 values via: 3949 // I1 = NOT(J1 EOR S); 3950 // I2 = NOT(J2 EOR S); 3951 // and build the imm32 with two trailing zeros as documented: 3952 // imm32 = SignExtend(S:I1:I2:imm10H:imm10L:'00', 32); 3953 unsigned S = (Val >> 23) & 1; 3954 unsigned J1 = (Val >> 22) & 1; 3955 unsigned J2 = (Val >> 21) & 1; 3956 unsigned I1 = !(J1 ^ S); 3957 unsigned I2 = !(J2 ^ S); 3958 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21); 3959 int imm32 = SignExtend32<25>(tmp << 1); 3960 3961 if (!tryAddingSymbolicOperand(Address, 3962 (Address & ~2u) + imm32 + 4, 3963 true, 4, Inst, Decoder)) 3964 Inst.addOperand(MCOperand::createImm(imm32)); 3965 return MCDisassembler::Success; 3966} 3967 3968static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Val, 3969 uint64_t Address, const void *Decoder) { 3970 if (Val == 0xA || Val == 0xB) 3971 return MCDisassembler::Fail; 3972 3973 const FeatureBitset &featureBits = 3974 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits(); 3975 3976 if (featureBits[ARM::HasV8Ops] && !(Val == 14 || Val == 15)) 3977 return MCDisassembler::Fail; 3978 3979 Inst.addOperand(MCOperand::createImm(Val)); 3980 return MCDisassembler::Success; 3981} 3982 3983static DecodeStatus 3984DecodeThumbTableBranch(MCInst &Inst, unsigned Insn, 3985 uint64_t Address, const void *Decoder) { 3986 DecodeStatus S = MCDisassembler::Success; 3987 3988 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3989 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3990 3991 if (Rn == ARM::SP) S = MCDisassembler::SoftFail; 3992 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3993 return MCDisassembler::Fail; 3994 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) 3995 return MCDisassembler::Fail; 3996 return S; 3997} 3998 3999static DecodeStatus 4000DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Insn, 4001 uint64_t Address, const void *Decoder) { 4002 DecodeStatus S = MCDisassembler::Success; 4003 4004 unsigned pred = fieldFromInstruction(Insn, 22, 4); 4005 if (pred == 0xE || pred == 0xF) { 4006 unsigned opc = fieldFromInstruction(Insn, 4, 28); 4007 switch (opc) { 4008 default: 4009 return MCDisassembler::Fail; 4010 case 0xf3bf8f4: 4011 Inst.setOpcode(ARM::t2DSB); 4012 break; 4013 case 0xf3bf8f5: 4014 Inst.setOpcode(ARM::t2DMB); 4015 break; 4016 case 0xf3bf8f6: 4017 Inst.setOpcode(ARM::t2ISB); 4018 break; 4019 } 4020 4021 unsigned imm = fieldFromInstruction(Insn, 0, 4); 4022 return DecodeMemBarrierOption(Inst, imm, Address, Decoder); 4023 } 4024 4025 unsigned brtarget = fieldFromInstruction(Insn, 0, 11) << 1; 4026 brtarget |= fieldFromInstruction(Insn, 11, 1) << 19; 4027 brtarget |= fieldFromInstruction(Insn, 13, 1) << 18; 4028 brtarget |= fieldFromInstruction(Insn, 16, 6) << 12; 4029 brtarget |= fieldFromInstruction(Insn, 26, 1) << 20; 4030 4031 if (!Check(S, DecodeT2BROperand(Inst, brtarget, Address, Decoder))) 4032 return MCDisassembler::Fail; 4033 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4034 return MCDisassembler::Fail; 4035 4036 return S; 4037} 4038 4039// Decode a shifted immediate operand. These basically consist 4040// of an 8-bit value, and a 4-bit directive that specifies either 4041// a splat operation or a rotation. 4042static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val, 4043 uint64_t Address, const void *Decoder) { 4044 unsigned ctrl = fieldFromInstruction(Val, 10, 2); 4045 if (ctrl == 0) { 4046 unsigned byte = fieldFromInstruction(Val, 8, 2); 4047 unsigned imm = fieldFromInstruction(Val, 0, 8); 4048 switch (byte) { 4049 case 0: 4050 Inst.addOperand(MCOperand::createImm(imm)); 4051 break; 4052 case 1: 4053 Inst.addOperand(MCOperand::createImm((imm << 16) | imm)); 4054 break; 4055 case 2: 4056 Inst.addOperand(MCOperand::createImm((imm << 24) | (imm << 8))); 4057 break; 4058 case 3: 4059 Inst.addOperand(MCOperand::createImm((imm << 24) | (imm << 16) | 4060 (imm << 8) | imm)); 4061 break; 4062 } 4063 } else { 4064 unsigned unrot = fieldFromInstruction(Val, 0, 7) | 0x80; 4065 unsigned rot = fieldFromInstruction(Val, 7, 5); 4066 unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31)); 4067 Inst.addOperand(MCOperand::createImm(imm)); 4068 } 4069 4070 return MCDisassembler::Success; 4071} 4072 4073static DecodeStatus 4074DecodeThumbBCCTargetOperand(MCInst &Inst, unsigned Val, 4075 uint64_t Address, const void *Decoder) { 4076 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<9>(Val<<1) + 4, 4077 true, 2, Inst, Decoder)) 4078 Inst.addOperand(MCOperand::createImm(SignExtend32<9>(Val << 1))); 4079 return MCDisassembler::Success; 4080} 4081 4082static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val, 4083 uint64_t Address, 4084 const void *Decoder) { 4085 // Val is passed in as S:J1:J2:imm10:imm11 4086 // Note no trailing zero after imm11. Also the J1 and J2 values are from 4087 // the encoded instruction. So here change to I1 and I2 values via: 4088 // I1 = NOT(J1 EOR S); 4089 // I2 = NOT(J2 EOR S); 4090 // and build the imm32 with one trailing zero as documented: 4091 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32); 4092 unsigned S = (Val >> 23) & 1; 4093 unsigned J1 = (Val >> 22) & 1; 4094 unsigned J2 = (Val >> 21) & 1; 4095 unsigned I1 = !(J1 ^ S); 4096 unsigned I2 = !(J2 ^ S); 4097 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21); 4098 int imm32 = SignExtend32<25>(tmp << 1); 4099 4100 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4, 4101 true, 4, Inst, Decoder)) 4102 Inst.addOperand(MCOperand::createImm(imm32)); 4103 return MCDisassembler::Success; 4104} 4105 4106static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Val, 4107 uint64_t Address, const void *Decoder) { 4108 if (Val & ~0xf) 4109 return MCDisassembler::Fail; 4110 4111 Inst.addOperand(MCOperand::createImm(Val)); 4112 return MCDisassembler::Success; 4113} 4114 4115static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Val, 4116 uint64_t Address, const void *Decoder) { 4117 if (Val & ~0xf) 4118 return MCDisassembler::Fail; 4119 4120 Inst.addOperand(MCOperand::createImm(Val)); 4121 return MCDisassembler::Success; 4122} 4123 4124static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Val, 4125 uint64_t Address, const void *Decoder) { 4126 DecodeStatus S = MCDisassembler::Success; 4127 const FeatureBitset &FeatureBits = 4128 ((const MCDisassembler*)Decoder)->getSubtargetInfo().getFeatureBits(); 4129 4130 if (FeatureBits[ARM::FeatureMClass]) { 4131 unsigned ValLow = Val & 0xff; 4132 4133 // Validate the SYSm value first. 4134 switch (ValLow) { 4135 case 0: // apsr 4136 case 1: // iapsr 4137 case 2: // eapsr 4138 case 3: // xpsr 4139 case 5: // ipsr 4140 case 6: // epsr 4141 case 7: // iepsr 4142 case 8: // msp 4143 case 9: // psp 4144 case 16: // primask 4145 case 20: // control 4146 break; 4147 case 17: // basepri 4148 case 18: // basepri_max 4149 case 19: // faultmask 4150 if (!(FeatureBits[ARM::HasV7Ops])) 4151 // Values basepri, basepri_max and faultmask are only valid for v7m. 4152 return MCDisassembler::Fail; 4153 break; 4154 case 0x8a: // msplim_ns 4155 case 0x8b: // psplim_ns 4156 case 0x91: // basepri_ns 4157 case 0x93: // faultmask_ns 4158 if (!(FeatureBits[ARM::HasV8MMainlineOps])) 4159 return MCDisassembler::Fail; 4160 LLVM_FALLTHROUGH; 4161 case 10: // msplim 4162 case 11: // psplim 4163 case 0x88: // msp_ns 4164 case 0x89: // psp_ns 4165 case 0x90: // primask_ns 4166 case 0x94: // control_ns 4167 case 0x98: // sp_ns 4168 if (!(FeatureBits[ARM::Feature8MSecExt])) 4169 return MCDisassembler::Fail; 4170 break; 4171 default: 4172 // Architecturally defined as unpredictable 4173 S = MCDisassembler::SoftFail; 4174 break; 4175 } 4176 4177 if (Inst.getOpcode() == ARM::t2MSR_M) { 4178 unsigned Mask = fieldFromInstruction(Val, 10, 2); 4179 if (!(FeatureBits[ARM::HasV7Ops])) { 4180 // The ARMv6-M MSR bits {11-10} can be only 0b10, other values are 4181 // unpredictable. 4182 if (Mask != 2) 4183 S = MCDisassembler::SoftFail; 4184 } 4185 else { 4186 // The ARMv7-M architecture stores an additional 2-bit mask value in 4187 // MSR bits {11-10}. The mask is used only with apsr, iapsr, eapsr and 4188 // xpsr, it has to be 0b10 in other cases. Bit mask{1} indicates if 4189 // the NZCVQ bits should be moved by the instruction. Bit mask{0} 4190 // indicates the move for the GE{3:0} bits, the mask{0} bit can be set 4191 // only if the processor includes the DSP extension. 4192 if (Mask == 0 || (Mask != 2 && ValLow > 3) || 4193 (!(FeatureBits[ARM::FeatureDSP]) && (Mask & 1))) 4194 S = MCDisassembler::SoftFail; 4195 } 4196 } 4197 } else { 4198 // A/R class 4199 if (Val == 0) 4200 return MCDisassembler::Fail; 4201 } 4202 Inst.addOperand(MCOperand::createImm(Val)); 4203 return S; 4204} 4205 4206static DecodeStatus DecodeBankedReg(MCInst &Inst, unsigned Val, 4207 uint64_t Address, const void *Decoder) { 4208 unsigned R = fieldFromInstruction(Val, 5, 1); 4209 unsigned SysM = fieldFromInstruction(Val, 0, 5); 4210 4211 // The table of encodings for these banked registers comes from B9.2.3 of the 4212 // ARM ARM. There are patterns, but nothing regular enough to make this logic 4213 // neater. So by fiat, these values are UNPREDICTABLE: 4214 if (!ARMBankedReg::lookupBankedRegByEncoding((R << 5) | SysM)) 4215 return MCDisassembler::Fail; 4216 4217 Inst.addOperand(MCOperand::createImm(Val)); 4218 return MCDisassembler::Success; 4219} 4220 4221static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn, 4222 uint64_t Address, const void *Decoder) { 4223 DecodeStatus S = MCDisassembler::Success; 4224 4225 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4226 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4227 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4228 4229 if (Rn == 0xF) 4230 S = MCDisassembler::SoftFail; 4231 4232 if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder))) 4233 return MCDisassembler::Fail; 4234 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4235 return MCDisassembler::Fail; 4236 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4237 return MCDisassembler::Fail; 4238 4239 return S; 4240} 4241 4242static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn, 4243 uint64_t Address, 4244 const void *Decoder) { 4245 DecodeStatus S = MCDisassembler::Success; 4246 4247 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4248 unsigned Rt = fieldFromInstruction(Insn, 0, 4); 4249 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4250 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4251 4252 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) 4253 return MCDisassembler::Fail; 4254 4255 if (Rn == 0xF || Rd == Rn || Rd == Rt || Rd == Rt+1) 4256 S = MCDisassembler::SoftFail; 4257 4258 if (!Check(S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder))) 4259 return MCDisassembler::Fail; 4260 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4261 return MCDisassembler::Fail; 4262 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4263 return MCDisassembler::Fail; 4264 4265 return S; 4266} 4267 4268static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn, 4269 uint64_t Address, const void *Decoder) { 4270 DecodeStatus S = MCDisassembler::Success; 4271 4272 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4273 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4274 unsigned imm = fieldFromInstruction(Insn, 0, 12); 4275 imm |= fieldFromInstruction(Insn, 16, 4) << 13; 4276 imm |= fieldFromInstruction(Insn, 23, 1) << 12; 4277 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4278 4279 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 4280 4281 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 4282 return MCDisassembler::Fail; 4283 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4284 return MCDisassembler::Fail; 4285 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) 4286 return MCDisassembler::Fail; 4287 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4288 return MCDisassembler::Fail; 4289 4290 return S; 4291} 4292 4293static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn, 4294 uint64_t Address, const void *Decoder) { 4295 DecodeStatus S = MCDisassembler::Success; 4296 4297 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4298 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4299 unsigned imm = fieldFromInstruction(Insn, 0, 12); 4300 imm |= fieldFromInstruction(Insn, 16, 4) << 13; 4301 imm |= fieldFromInstruction(Insn, 23, 1) << 12; 4302 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4303 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4304 4305 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 4306 if (Rm == 0xF) S = MCDisassembler::SoftFail; 4307 4308 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 4309 return MCDisassembler::Fail; 4310 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4311 return MCDisassembler::Fail; 4312 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) 4313 return MCDisassembler::Fail; 4314 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4315 return MCDisassembler::Fail; 4316 4317 return S; 4318} 4319 4320static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn, 4321 uint64_t Address, const void *Decoder) { 4322 DecodeStatus S = MCDisassembler::Success; 4323 4324 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4325 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4326 unsigned imm = fieldFromInstruction(Insn, 0, 12); 4327 imm |= fieldFromInstruction(Insn, 16, 4) << 13; 4328 imm |= fieldFromInstruction(Insn, 23, 1) << 12; 4329 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4330 4331 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 4332 4333 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4334 return MCDisassembler::Fail; 4335 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 4336 return MCDisassembler::Fail; 4337 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) 4338 return MCDisassembler::Fail; 4339 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4340 return MCDisassembler::Fail; 4341 4342 return S; 4343} 4344 4345static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn, 4346 uint64_t Address, const void *Decoder) { 4347 DecodeStatus S = MCDisassembler::Success; 4348 4349 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4350 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4351 unsigned imm = fieldFromInstruction(Insn, 0, 12); 4352 imm |= fieldFromInstruction(Insn, 16, 4) << 13; 4353 imm |= fieldFromInstruction(Insn, 23, 1) << 12; 4354 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4355 4356 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 4357 4358 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4359 return MCDisassembler::Fail; 4360 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 4361 return MCDisassembler::Fail; 4362 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) 4363 return MCDisassembler::Fail; 4364 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4365 return MCDisassembler::Fail; 4366 4367 return S; 4368} 4369 4370static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn, 4371 uint64_t Address, const void *Decoder) { 4372 DecodeStatus S = MCDisassembler::Success; 4373 4374 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4375 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4376 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4377 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4378 unsigned size = fieldFromInstruction(Insn, 10, 2); 4379 4380 unsigned align = 0; 4381 unsigned index = 0; 4382 switch (size) { 4383 default: 4384 return MCDisassembler::Fail; 4385 case 0: 4386 if (fieldFromInstruction(Insn, 4, 1)) 4387 return MCDisassembler::Fail; // UNDEFINED 4388 index = fieldFromInstruction(Insn, 5, 3); 4389 break; 4390 case 1: 4391 if (fieldFromInstruction(Insn, 5, 1)) 4392 return MCDisassembler::Fail; // UNDEFINED 4393 index = fieldFromInstruction(Insn, 6, 2); 4394 if (fieldFromInstruction(Insn, 4, 1)) 4395 align = 2; 4396 break; 4397 case 2: 4398 if (fieldFromInstruction(Insn, 6, 1)) 4399 return MCDisassembler::Fail; // UNDEFINED 4400 index = fieldFromInstruction(Insn, 7, 1); 4401 4402 switch (fieldFromInstruction(Insn, 4, 2)) { 4403 case 0 : 4404 align = 0; break; 4405 case 3: 4406 align = 4; break; 4407 default: 4408 return MCDisassembler::Fail; 4409 } 4410 break; 4411 } 4412 4413 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4414 return MCDisassembler::Fail; 4415 if (Rm != 0xF) { // Writeback 4416 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4417 return MCDisassembler::Fail; 4418 } 4419 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4420 return MCDisassembler::Fail; 4421 Inst.addOperand(MCOperand::createImm(align)); 4422 if (Rm != 0xF) { 4423 if (Rm != 0xD) { 4424 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4425 return MCDisassembler::Fail; 4426 } else 4427 Inst.addOperand(MCOperand::createReg(0)); 4428 } 4429 4430 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4431 return MCDisassembler::Fail; 4432 Inst.addOperand(MCOperand::createImm(index)); 4433 4434 return S; 4435} 4436 4437static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn, 4438 uint64_t Address, const void *Decoder) { 4439 DecodeStatus S = MCDisassembler::Success; 4440 4441 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4442 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4443 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4444 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4445 unsigned size = fieldFromInstruction(Insn, 10, 2); 4446 4447 unsigned align = 0; 4448 unsigned index = 0; 4449 switch (size) { 4450 default: 4451 return MCDisassembler::Fail; 4452 case 0: 4453 if (fieldFromInstruction(Insn, 4, 1)) 4454 return MCDisassembler::Fail; // UNDEFINED 4455 index = fieldFromInstruction(Insn, 5, 3); 4456 break; 4457 case 1: 4458 if (fieldFromInstruction(Insn, 5, 1)) 4459 return MCDisassembler::Fail; // UNDEFINED 4460 index = fieldFromInstruction(Insn, 6, 2); 4461 if (fieldFromInstruction(Insn, 4, 1)) 4462 align = 2; 4463 break; 4464 case 2: 4465 if (fieldFromInstruction(Insn, 6, 1)) 4466 return MCDisassembler::Fail; // UNDEFINED 4467 index = fieldFromInstruction(Insn, 7, 1); 4468 4469 switch (fieldFromInstruction(Insn, 4, 2)) { 4470 case 0: 4471 align = 0; break; 4472 case 3: 4473 align = 4; break; 4474 default: 4475 return MCDisassembler::Fail; 4476 } 4477 break; 4478 } 4479 4480 if (Rm != 0xF) { // Writeback 4481 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4482 return MCDisassembler::Fail; 4483 } 4484 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4485 return MCDisassembler::Fail; 4486 Inst.addOperand(MCOperand::createImm(align)); 4487 if (Rm != 0xF) { 4488 if (Rm != 0xD) { 4489 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4490 return MCDisassembler::Fail; 4491 } else 4492 Inst.addOperand(MCOperand::createReg(0)); 4493 } 4494 4495 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4496 return MCDisassembler::Fail; 4497 Inst.addOperand(MCOperand::createImm(index)); 4498 4499 return S; 4500} 4501 4502static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn, 4503 uint64_t Address, const void *Decoder) { 4504 DecodeStatus S = MCDisassembler::Success; 4505 4506 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4507 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4508 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4509 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4510 unsigned size = fieldFromInstruction(Insn, 10, 2); 4511 4512 unsigned align = 0; 4513 unsigned index = 0; 4514 unsigned inc = 1; 4515 switch (size) { 4516 default: 4517 return MCDisassembler::Fail; 4518 case 0: 4519 index = fieldFromInstruction(Insn, 5, 3); 4520 if (fieldFromInstruction(Insn, 4, 1)) 4521 align = 2; 4522 break; 4523 case 1: 4524 index = fieldFromInstruction(Insn, 6, 2); 4525 if (fieldFromInstruction(Insn, 4, 1)) 4526 align = 4; 4527 if (fieldFromInstruction(Insn, 5, 1)) 4528 inc = 2; 4529 break; 4530 case 2: 4531 if (fieldFromInstruction(Insn, 5, 1)) 4532 return MCDisassembler::Fail; // UNDEFINED 4533 index = fieldFromInstruction(Insn, 7, 1); 4534 if (fieldFromInstruction(Insn, 4, 1) != 0) 4535 align = 8; 4536 if (fieldFromInstruction(Insn, 6, 1)) 4537 inc = 2; 4538 break; 4539 } 4540 4541 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4542 return MCDisassembler::Fail; 4543 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4544 return MCDisassembler::Fail; 4545 if (Rm != 0xF) { // Writeback 4546 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4547 return MCDisassembler::Fail; 4548 } 4549 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4550 return MCDisassembler::Fail; 4551 Inst.addOperand(MCOperand::createImm(align)); 4552 if (Rm != 0xF) { 4553 if (Rm != 0xD) { 4554 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4555 return MCDisassembler::Fail; 4556 } else 4557 Inst.addOperand(MCOperand::createReg(0)); 4558 } 4559 4560 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4561 return MCDisassembler::Fail; 4562 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4563 return MCDisassembler::Fail; 4564 Inst.addOperand(MCOperand::createImm(index)); 4565 4566 return S; 4567} 4568 4569static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn, 4570 uint64_t Address, const void *Decoder) { 4571 DecodeStatus S = MCDisassembler::Success; 4572 4573 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4574 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4575 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4576 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4577 unsigned size = fieldFromInstruction(Insn, 10, 2); 4578 4579 unsigned align = 0; 4580 unsigned index = 0; 4581 unsigned inc = 1; 4582 switch (size) { 4583 default: 4584 return MCDisassembler::Fail; 4585 case 0: 4586 index = fieldFromInstruction(Insn, 5, 3); 4587 if (fieldFromInstruction(Insn, 4, 1)) 4588 align = 2; 4589 break; 4590 case 1: 4591 index = fieldFromInstruction(Insn, 6, 2); 4592 if (fieldFromInstruction(Insn, 4, 1)) 4593 align = 4; 4594 if (fieldFromInstruction(Insn, 5, 1)) 4595 inc = 2; 4596 break; 4597 case 2: 4598 if (fieldFromInstruction(Insn, 5, 1)) 4599 return MCDisassembler::Fail; // UNDEFINED 4600 index = fieldFromInstruction(Insn, 7, 1); 4601 if (fieldFromInstruction(Insn, 4, 1) != 0) 4602 align = 8; 4603 if (fieldFromInstruction(Insn, 6, 1)) 4604 inc = 2; 4605 break; 4606 } 4607 4608 if (Rm != 0xF) { // Writeback 4609 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4610 return MCDisassembler::Fail; 4611 } 4612 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4613 return MCDisassembler::Fail; 4614 Inst.addOperand(MCOperand::createImm(align)); 4615 if (Rm != 0xF) { 4616 if (Rm != 0xD) { 4617 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4618 return MCDisassembler::Fail; 4619 } else 4620 Inst.addOperand(MCOperand::createReg(0)); 4621 } 4622 4623 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4624 return MCDisassembler::Fail; 4625 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4626 return MCDisassembler::Fail; 4627 Inst.addOperand(MCOperand::createImm(index)); 4628 4629 return S; 4630} 4631 4632static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn, 4633 uint64_t Address, const void *Decoder) { 4634 DecodeStatus S = MCDisassembler::Success; 4635 4636 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4637 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4638 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4639 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4640 unsigned size = fieldFromInstruction(Insn, 10, 2); 4641 4642 unsigned align = 0; 4643 unsigned index = 0; 4644 unsigned inc = 1; 4645 switch (size) { 4646 default: 4647 return MCDisassembler::Fail; 4648 case 0: 4649 if (fieldFromInstruction(Insn, 4, 1)) 4650 return MCDisassembler::Fail; // UNDEFINED 4651 index = fieldFromInstruction(Insn, 5, 3); 4652 break; 4653 case 1: 4654 if (fieldFromInstruction(Insn, 4, 1)) 4655 return MCDisassembler::Fail; // UNDEFINED 4656 index = fieldFromInstruction(Insn, 6, 2); 4657 if (fieldFromInstruction(Insn, 5, 1)) 4658 inc = 2; 4659 break; 4660 case 2: 4661 if (fieldFromInstruction(Insn, 4, 2)) 4662 return MCDisassembler::Fail; // UNDEFINED 4663 index = fieldFromInstruction(Insn, 7, 1); 4664 if (fieldFromInstruction(Insn, 6, 1)) 4665 inc = 2; 4666 break; 4667 } 4668 4669 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4670 return MCDisassembler::Fail; 4671 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4672 return MCDisassembler::Fail; 4673 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4674 return MCDisassembler::Fail; 4675 4676 if (Rm != 0xF) { // Writeback 4677 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4678 return MCDisassembler::Fail; 4679 } 4680 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4681 return MCDisassembler::Fail; 4682 Inst.addOperand(MCOperand::createImm(align)); 4683 if (Rm != 0xF) { 4684 if (Rm != 0xD) { 4685 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4686 return MCDisassembler::Fail; 4687 } else 4688 Inst.addOperand(MCOperand::createReg(0)); 4689 } 4690 4691 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4692 return MCDisassembler::Fail; 4693 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4694 return MCDisassembler::Fail; 4695 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4696 return MCDisassembler::Fail; 4697 Inst.addOperand(MCOperand::createImm(index)); 4698 4699 return S; 4700} 4701 4702static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn, 4703 uint64_t Address, const void *Decoder) { 4704 DecodeStatus S = MCDisassembler::Success; 4705 4706 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4707 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4708 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4709 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4710 unsigned size = fieldFromInstruction(Insn, 10, 2); 4711 4712 unsigned align = 0; 4713 unsigned index = 0; 4714 unsigned inc = 1; 4715 switch (size) { 4716 default: 4717 return MCDisassembler::Fail; 4718 case 0: 4719 if (fieldFromInstruction(Insn, 4, 1)) 4720 return MCDisassembler::Fail; // UNDEFINED 4721 index = fieldFromInstruction(Insn, 5, 3); 4722 break; 4723 case 1: 4724 if (fieldFromInstruction(Insn, 4, 1)) 4725 return MCDisassembler::Fail; // UNDEFINED 4726 index = fieldFromInstruction(Insn, 6, 2); 4727 if (fieldFromInstruction(Insn, 5, 1)) 4728 inc = 2; 4729 break; 4730 case 2: 4731 if (fieldFromInstruction(Insn, 4, 2)) 4732 return MCDisassembler::Fail; // UNDEFINED 4733 index = fieldFromInstruction(Insn, 7, 1); 4734 if (fieldFromInstruction(Insn, 6, 1)) 4735 inc = 2; 4736 break; 4737 } 4738 4739 if (Rm != 0xF) { // Writeback 4740 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4741 return MCDisassembler::Fail; 4742 } 4743 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4744 return MCDisassembler::Fail; 4745 Inst.addOperand(MCOperand::createImm(align)); 4746 if (Rm != 0xF) { 4747 if (Rm != 0xD) { 4748 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4749 return MCDisassembler::Fail; 4750 } else 4751 Inst.addOperand(MCOperand::createReg(0)); 4752 } 4753 4754 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4755 return MCDisassembler::Fail; 4756 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4757 return MCDisassembler::Fail; 4758 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4759 return MCDisassembler::Fail; 4760 Inst.addOperand(MCOperand::createImm(index)); 4761 4762 return S; 4763} 4764 4765static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn, 4766 uint64_t Address, const void *Decoder) { 4767 DecodeStatus S = MCDisassembler::Success; 4768 4769 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4770 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4771 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4772 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4773 unsigned size = fieldFromInstruction(Insn, 10, 2); 4774 4775 unsigned align = 0; 4776 unsigned index = 0; 4777 unsigned inc = 1; 4778 switch (size) { 4779 default: 4780 return MCDisassembler::Fail; 4781 case 0: 4782 if (fieldFromInstruction(Insn, 4, 1)) 4783 align = 4; 4784 index = fieldFromInstruction(Insn, 5, 3); 4785 break; 4786 case 1: 4787 if (fieldFromInstruction(Insn, 4, 1)) 4788 align = 8; 4789 index = fieldFromInstruction(Insn, 6, 2); 4790 if (fieldFromInstruction(Insn, 5, 1)) 4791 inc = 2; 4792 break; 4793 case 2: 4794 switch (fieldFromInstruction(Insn, 4, 2)) { 4795 case 0: 4796 align = 0; break; 4797 case 3: 4798 return MCDisassembler::Fail; 4799 default: 4800 align = 4 << fieldFromInstruction(Insn, 4, 2); break; 4801 } 4802 4803 index = fieldFromInstruction(Insn, 7, 1); 4804 if (fieldFromInstruction(Insn, 6, 1)) 4805 inc = 2; 4806 break; 4807 } 4808 4809 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4810 return MCDisassembler::Fail; 4811 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4812 return MCDisassembler::Fail; 4813 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4814 return MCDisassembler::Fail; 4815 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 4816 return MCDisassembler::Fail; 4817 4818 if (Rm != 0xF) { // Writeback 4819 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4820 return MCDisassembler::Fail; 4821 } 4822 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4823 return MCDisassembler::Fail; 4824 Inst.addOperand(MCOperand::createImm(align)); 4825 if (Rm != 0xF) { 4826 if (Rm != 0xD) { 4827 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4828 return MCDisassembler::Fail; 4829 } else 4830 Inst.addOperand(MCOperand::createReg(0)); 4831 } 4832 4833 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4834 return MCDisassembler::Fail; 4835 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4836 return MCDisassembler::Fail; 4837 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4838 return MCDisassembler::Fail; 4839 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 4840 return MCDisassembler::Fail; 4841 Inst.addOperand(MCOperand::createImm(index)); 4842 4843 return S; 4844} 4845 4846static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn, 4847 uint64_t Address, const void *Decoder) { 4848 DecodeStatus S = MCDisassembler::Success; 4849 4850 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4851 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4852 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4853 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4854 unsigned size = fieldFromInstruction(Insn, 10, 2); 4855 4856 unsigned align = 0; 4857 unsigned index = 0; 4858 unsigned inc = 1; 4859 switch (size) { 4860 default: 4861 return MCDisassembler::Fail; 4862 case 0: 4863 if (fieldFromInstruction(Insn, 4, 1)) 4864 align = 4; 4865 index = fieldFromInstruction(Insn, 5, 3); 4866 break; 4867 case 1: 4868 if (fieldFromInstruction(Insn, 4, 1)) 4869 align = 8; 4870 index = fieldFromInstruction(Insn, 6, 2); 4871 if (fieldFromInstruction(Insn, 5, 1)) 4872 inc = 2; 4873 break; 4874 case 2: 4875 switch (fieldFromInstruction(Insn, 4, 2)) { 4876 case 0: 4877 align = 0; break; 4878 case 3: 4879 return MCDisassembler::Fail; 4880 default: 4881 align = 4 << fieldFromInstruction(Insn, 4, 2); break; 4882 } 4883 4884 index = fieldFromInstruction(Insn, 7, 1); 4885 if (fieldFromInstruction(Insn, 6, 1)) 4886 inc = 2; 4887 break; 4888 } 4889 4890 if (Rm != 0xF) { // Writeback 4891 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4892 return MCDisassembler::Fail; 4893 } 4894 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4895 return MCDisassembler::Fail; 4896 Inst.addOperand(MCOperand::createImm(align)); 4897 if (Rm != 0xF) { 4898 if (Rm != 0xD) { 4899 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4900 return MCDisassembler::Fail; 4901 } else 4902 Inst.addOperand(MCOperand::createReg(0)); 4903 } 4904 4905 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4906 return MCDisassembler::Fail; 4907 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4908 return MCDisassembler::Fail; 4909 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4910 return MCDisassembler::Fail; 4911 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 4912 return MCDisassembler::Fail; 4913 Inst.addOperand(MCOperand::createImm(index)); 4914 4915 return S; 4916} 4917 4918static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn, 4919 uint64_t Address, const void *Decoder) { 4920 DecodeStatus S = MCDisassembler::Success; 4921 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4922 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4); 4923 unsigned Rm = fieldFromInstruction(Insn, 5, 1); 4924 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4925 Rm |= fieldFromInstruction(Insn, 0, 4) << 1; 4926 4927 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) 4928 S = MCDisassembler::SoftFail; 4929 4930 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) 4931 return MCDisassembler::Fail; 4932 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) 4933 return MCDisassembler::Fail; 4934 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) 4935 return MCDisassembler::Fail; 4936 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) 4937 return MCDisassembler::Fail; 4938 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4939 return MCDisassembler::Fail; 4940 4941 return S; 4942} 4943 4944static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn, 4945 uint64_t Address, const void *Decoder) { 4946 DecodeStatus S = MCDisassembler::Success; 4947 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4948 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4); 4949 unsigned Rm = fieldFromInstruction(Insn, 5, 1); 4950 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4951 Rm |= fieldFromInstruction(Insn, 0, 4) << 1; 4952 4953 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) 4954 S = MCDisassembler::SoftFail; 4955 4956 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) 4957 return MCDisassembler::Fail; 4958 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) 4959 return MCDisassembler::Fail; 4960 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) 4961 return MCDisassembler::Fail; 4962 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) 4963 return MCDisassembler::Fail; 4964 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4965 return MCDisassembler::Fail; 4966 4967 return S; 4968} 4969 4970static DecodeStatus DecodeIT(MCInst &Inst, unsigned Insn, 4971 uint64_t Address, const void *Decoder) { 4972 DecodeStatus S = MCDisassembler::Success; 4973 unsigned pred = fieldFromInstruction(Insn, 4, 4); 4974 unsigned mask = fieldFromInstruction(Insn, 0, 4); 4975 4976 if (pred == 0xF) { 4977 pred = 0xE; 4978 S = MCDisassembler::SoftFail; 4979 } 4980 4981 if (mask == 0x0) 4982 return MCDisassembler::Fail; 4983 4984 Inst.addOperand(MCOperand::createImm(pred)); 4985 Inst.addOperand(MCOperand::createImm(mask)); 4986 return S; 4987} 4988 4989static DecodeStatus 4990DecodeT2LDRDPreInstruction(MCInst &Inst, unsigned Insn, 4991 uint64_t Address, const void *Decoder) { 4992 DecodeStatus S = MCDisassembler::Success; 4993 4994 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4995 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4); 4996 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4997 unsigned addr = fieldFromInstruction(Insn, 0, 8); 4998 unsigned W = fieldFromInstruction(Insn, 21, 1); 4999 unsigned U = fieldFromInstruction(Insn, 23, 1); 5000 unsigned P = fieldFromInstruction(Insn, 24, 1); 5001 bool writeback = (W == 1) | (P == 0); 5002 5003 addr |= (U << 8) | (Rn << 9); 5004 5005 if (writeback && (Rn == Rt || Rn == Rt2)) 5006 Check(S, MCDisassembler::SoftFail); 5007 if (Rt == Rt2) 5008 Check(S, MCDisassembler::SoftFail); 5009 5010 // Rt 5011 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 5012 return MCDisassembler::Fail; 5013 // Rt2 5014 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) 5015 return MCDisassembler::Fail; 5016 // Writeback operand 5017 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) 5018 return MCDisassembler::Fail; 5019 // addr 5020 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) 5021 return MCDisassembler::Fail; 5022 5023 return S; 5024} 5025 5026static DecodeStatus 5027DecodeT2STRDPreInstruction(MCInst &Inst, unsigned Insn, 5028 uint64_t Address, const void *Decoder) { 5029 DecodeStatus S = MCDisassembler::Success; 5030 5031 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 5032 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4); 5033 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 5034 unsigned addr = fieldFromInstruction(Insn, 0, 8); 5035 unsigned W = fieldFromInstruction(Insn, 21, 1); 5036 unsigned U = fieldFromInstruction(Insn, 23, 1); 5037 unsigned P = fieldFromInstruction(Insn, 24, 1); 5038 bool writeback = (W == 1) | (P == 0); 5039 5040 addr |= (U << 8) | (Rn << 9); 5041 5042 if (writeback && (Rn == Rt || Rn == Rt2)) 5043 Check(S, MCDisassembler::SoftFail); 5044 5045 // Writeback operand 5046 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) 5047 return MCDisassembler::Fail; 5048 // Rt 5049 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 5050 return MCDisassembler::Fail; 5051 // Rt2 5052 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) 5053 return MCDisassembler::Fail; 5054 // addr 5055 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) 5056 return MCDisassembler::Fail; 5057 5058 return S; 5059} 5060 5061static DecodeStatus DecodeT2Adr(MCInst &Inst, uint32_t Insn, 5062 uint64_t Address, const void *Decoder) { 5063 unsigned sign1 = fieldFromInstruction(Insn, 21, 1); 5064 unsigned sign2 = fieldFromInstruction(Insn, 23, 1); 5065 if (sign1 != sign2) return MCDisassembler::Fail; 5066 5067 unsigned Val = fieldFromInstruction(Insn, 0, 8); 5068 Val |= fieldFromInstruction(Insn, 12, 3) << 8; 5069 Val |= fieldFromInstruction(Insn, 26, 1) << 11; 5070 Val |= sign1 << 12; 5071 Inst.addOperand(MCOperand::createImm(SignExtend32<13>(Val))); 5072 5073 return MCDisassembler::Success; 5074} 5075 5076static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, uint32_t Val, 5077 uint64_t Address, 5078 const void *Decoder) { 5079 DecodeStatus S = MCDisassembler::Success; 5080 5081 // Shift of "asr #32" is not allowed in Thumb2 mode. 5082 if (Val == 0x20) S = MCDisassembler::Fail; 5083 Inst.addOperand(MCOperand::createImm(Val)); 5084 return S; 5085} 5086 5087static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn, 5088 uint64_t Address, const void *Decoder) { 5089 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 5090 unsigned Rt2 = fieldFromInstruction(Insn, 0, 4); 5091 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 5092 unsigned pred = fieldFromInstruction(Insn, 28, 4); 5093 5094 if (pred == 0xF) 5095 return DecodeCPSInstruction(Inst, Insn, Address, Decoder); 5096 5097 DecodeStatus S = MCDisassembler::Success; 5098 5099 if (Rt == Rn || Rn == Rt2) 5100 S = MCDisassembler::SoftFail; 5101 5102 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) 5103 return MCDisassembler::Fail; 5104 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder))) 5105 return MCDisassembler::Fail; 5106 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 5107 return MCDisassembler::Fail; 5108 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 5109 return MCDisassembler::Fail; 5110 5111 return S; 5112} 5113 5114static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn, 5115 uint64_t Address, const void *Decoder) { 5116 const FeatureBitset &featureBits = 5117 ((const MCDisassembler *)Decoder)->getSubtargetInfo().getFeatureBits(); 5118 bool hasFullFP16 = featureBits[ARM::FeatureFullFP16]; 5119 5120 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0); 5121 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4); 5122 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0); 5123 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4); 5124 unsigned imm = fieldFromInstruction(Insn, 16, 6); 5125 unsigned cmode = fieldFromInstruction(Insn, 8, 4); 5126 unsigned op = fieldFromInstruction(Insn, 5, 1); 5127 5128 DecodeStatus S = MCDisassembler::Success; 5129 5130 // If the top 3 bits of imm are clear, this is a VMOV (immediate) 5131 if (!(imm & 0x38)) { 5132 if (cmode == 0xF) { 5133 if (op == 1) return MCDisassembler::Fail; 5134 Inst.setOpcode(ARM::VMOVv2f32); 5135 } 5136 if (hasFullFP16) { 5137 if (cmode == 0xE) { 5138 if (op == 1) { 5139 Inst.setOpcode(ARM::VMOVv1i64); 5140 } else { 5141 Inst.setOpcode(ARM::VMOVv8i8); 5142 } 5143 } 5144 if (cmode == 0xD) { 5145 if (op == 1) { 5146 Inst.setOpcode(ARM::VMVNv2i32); 5147 } else { 5148 Inst.setOpcode(ARM::VMOVv2i32); 5149 } 5150 } 5151 if (cmode == 0xC) { 5152 if (op == 1) { 5153 Inst.setOpcode(ARM::VMVNv2i32); 5154 } else { 5155 Inst.setOpcode(ARM::VMOVv2i32); 5156 } 5157 } 5158 } 5159 return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder); 5160 } 5161 5162 if (!(imm & 0x20)) return MCDisassembler::Fail; 5163 5164 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder))) 5165 return MCDisassembler::Fail; 5166 if (!Check(S, DecodeDPRRegisterClass(Inst, Vm, Address, Decoder))) 5167 return MCDisassembler::Fail; 5168 Inst.addOperand(MCOperand::createImm(64 - imm)); 5169 5170 return S; 5171} 5172 5173static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn, 5174 uint64_t Address, const void *Decoder) { 5175 const FeatureBitset &featureBits = 5176 ((const MCDisassembler *)Decoder)->getSubtargetInfo().getFeatureBits(); 5177 bool hasFullFP16 = featureBits[ARM::FeatureFullFP16]; 5178 5179 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0); 5180 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4); 5181 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0); 5182 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4); 5183 unsigned imm = fieldFromInstruction(Insn, 16, 6); 5184 unsigned cmode = fieldFromInstruction(Insn, 8, 4); 5185 unsigned op = fieldFromInstruction(Insn, 5, 1); 5186 5187 DecodeStatus S = MCDisassembler::Success; 5188 5189 // If the top 3 bits of imm are clear, this is a VMOV (immediate) 5190 if (!(imm & 0x38)) { 5191 if (cmode == 0xF) { 5192 if (op == 1) return MCDisassembler::Fail; 5193 Inst.setOpcode(ARM::VMOVv4f32); 5194 } 5195 if (hasFullFP16) { 5196 if (cmode == 0xE) { 5197 if (op == 1) { 5198 Inst.setOpcode(ARM::VMOVv2i64); 5199 } else { 5200 Inst.setOpcode(ARM::VMOVv16i8); 5201 } 5202 } 5203 if (cmode == 0xD) { 5204 if (op == 1) { 5205 Inst.setOpcode(ARM::VMVNv4i32); 5206 } else { 5207 Inst.setOpcode(ARM::VMOVv4i32); 5208 } 5209 } 5210 if (cmode == 0xC) { 5211 if (op == 1) { 5212 Inst.setOpcode(ARM::VMVNv4i32); 5213 } else { 5214 Inst.setOpcode(ARM::VMOVv4i32); 5215 } 5216 } 5217 } 5218 return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder); 5219 } 5220 5221 if (!(imm & 0x20)) return MCDisassembler::Fail; 5222 5223 if (!Check(S, DecodeQPRRegisterClass(Inst, Vd, Address, Decoder))) 5224 return MCDisassembler::Fail; 5225 if (!Check(S, DecodeQPRRegisterClass(Inst, Vm, Address, Decoder))) 5226 return MCDisassembler::Fail; 5227 Inst.addOperand(MCOperand::createImm(64 - imm)); 5228 5229 return S; 5230} 5231 5232static DecodeStatus DecodeNEONComplexLane64Instruction(MCInst &Inst, 5233 unsigned Insn, 5234 uint64_t Address, 5235 const void *Decoder) { 5236 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0); 5237 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4); 5238 unsigned Vn = (fieldFromInstruction(Insn, 16, 4) << 0); 5239 Vn |= (fieldFromInstruction(Insn, 7, 1) << 4); 5240 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0); 5241 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4); 5242 unsigned q = (fieldFromInstruction(Insn, 6, 1) << 0); 5243 unsigned rotate = (fieldFromInstruction(Insn, 20, 2) << 0); 5244 5245 DecodeStatus S = MCDisassembler::Success; 5246 5247 auto DestRegDecoder = q ? DecodeQPRRegisterClass : DecodeDPRRegisterClass; 5248 5249 if (!Check(S, DestRegDecoder(Inst, Vd, Address, Decoder))) 5250 return MCDisassembler::Fail; 5251 if (!Check(S, DestRegDecoder(Inst, Vd, Address, Decoder))) 5252 return MCDisassembler::Fail; 5253 if (!Check(S, DestRegDecoder(Inst, Vn, Address, Decoder))) 5254 return MCDisassembler::Fail; 5255 if (!Check(S, DecodeDPRRegisterClass(Inst, Vm, Address, Decoder))) 5256 return MCDisassembler::Fail; 5257 // The lane index does not have any bits in the encoding, because it can only 5258 // be 0. 5259 Inst.addOperand(MCOperand::createImm(0)); 5260 Inst.addOperand(MCOperand::createImm(rotate)); 5261 5262 return S; 5263} 5264 5265static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val, 5266 uint64_t Address, const void *Decoder) { 5267 DecodeStatus S = MCDisassembler::Success; 5268 5269 unsigned Rn = fieldFromInstruction(Val, 16, 4); 5270 unsigned Rt = fieldFromInstruction(Val, 12, 4); 5271 unsigned Rm = fieldFromInstruction(Val, 0, 4); 5272 Rm |= (fieldFromInstruction(Val, 23, 1) << 4); 5273 unsigned Cond = fieldFromInstruction(Val, 28, 4); 5274 5275 if (fieldFromInstruction(Val, 8, 4) != 0 || Rn == Rt) 5276 S = MCDisassembler::SoftFail; 5277 5278 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) 5279 return MCDisassembler::Fail; 5280 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 5281 return MCDisassembler::Fail; 5282 if (!Check(S, DecodeAddrMode7Operand(Inst, Rn, Address, Decoder))) 5283 return MCDisassembler::Fail; 5284 if (!Check(S, DecodePostIdxReg(Inst, Rm, Address, Decoder))) 5285 return MCDisassembler::Fail; 5286 if (!Check(S, DecodePredicateOperand(Inst, Cond, Address, Decoder))) 5287 return MCDisassembler::Fail; 5288 5289 return S; 5290} 5291 5292static DecodeStatus DecoderForMRRC2AndMCRR2(MCInst &Inst, unsigned Val, 5293 uint64_t Address, const void *Decoder) { 5294 DecodeStatus S = MCDisassembler::Success; 5295 5296 unsigned CRm = fieldFromInstruction(Val, 0, 4); 5297 unsigned opc1 = fieldFromInstruction(Val, 4, 4); 5298 unsigned cop = fieldFromInstruction(Val, 8, 4); 5299 unsigned Rt = fieldFromInstruction(Val, 12, 4); 5300 unsigned Rt2 = fieldFromInstruction(Val, 16, 4); 5301 5302 if ((cop & ~0x1) == 0xa) 5303 return MCDisassembler::Fail; 5304 5305 if (Rt == Rt2) 5306 S = MCDisassembler::SoftFail; 5307 5308 // We have to check if the instruction is MRRC2 5309 // or MCRR2 when constructing the operands for 5310 // Inst. Reason is because MRRC2 stores to two 5311 // registers so it's tablegen desc has has two 5312 // outputs whereas MCRR doesn't store to any 5313 // registers so all of it's operands are listed 5314 // as inputs, therefore the operand order for 5315 // MRRC2 needs to be [Rt, Rt2, cop, opc1, CRm] 5316 // and MCRR2 operand order is [cop, opc1, Rt, Rt2, CRm] 5317 5318 if (Inst.getOpcode() == ARM::MRRC2) { 5319 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) 5320 return MCDisassembler::Fail; 5321 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder))) 5322 return MCDisassembler::Fail; 5323 } 5324 Inst.addOperand(MCOperand::createImm(cop)); 5325 Inst.addOperand(MCOperand::createImm(opc1)); 5326 if (Inst.getOpcode() == ARM::MCRR2) { 5327 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) 5328 return MCDisassembler::Fail; 5329 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder))) 5330 return MCDisassembler::Fail; 5331 } 5332 Inst.addOperand(MCOperand::createImm(CRm)); 5333 5334 return S; 5335} 5336 5337static DecodeStatus DecodeForVMRSandVMSR(MCInst &Inst, unsigned Val, 5338 uint64_t Address, 5339 const void *Decoder) { 5340 const FeatureBitset &featureBits = 5341 ((const MCDisassembler *)Decoder)->getSubtargetInfo().getFeatureBits(); 5342 DecodeStatus S = MCDisassembler::Success; 5343 5344 unsigned Rt = fieldFromInstruction(Val, 12, 4); 5345 5346 if (featureBits[ARM::ModeThumb] && !featureBits[ARM::HasV8Ops]) { 5347 if (Rt == 13 || Rt == 15) 5348 S = MCDisassembler::SoftFail; 5349 Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)); 5350 } else 5351 Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)); 5352 5353 if (featureBits[ARM::ModeThumb]) { 5354 Inst.addOperand(MCOperand::createImm(ARMCC::AL)); 5355 Inst.addOperand(MCOperand::createReg(0)); 5356 } else { 5357 unsigned pred = fieldFromInstruction(Val, 28, 4); 5358 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 5359 return MCDisassembler::Fail; 5360 } 5361 5362 return S; 5363} 5364