1 //===- ARMDisassembler.cpp - Disassembler for ARM/Thumb ISA -----*- C++ -*-===// 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 #define DEBUG_TYPE "arm-disassembler" 11 12 #include "ARM.h" 13 #include "ARMRegisterInfo.h" 14 #include "ARMSubtarget.h" 15 #include "MCTargetDesc/ARMAddressingModes.h" 16 #include "MCTargetDesc/ARMMCExpr.h" 17 #include "MCTargetDesc/ARMBaseInfo.h" 18 #include "llvm/MC/EDInstInfo.h" 19 #include "llvm/MC/MCInst.h" 20 #include "llvm/MC/MCExpr.h" 21 #include "llvm/MC/MCContext.h" 22 #include "llvm/MC/MCDisassembler.h" 23 #include "llvm/Support/Debug.h" 24 #include "llvm/Support/MemoryObject.h" 25 #include "llvm/Support/ErrorHandling.h" 26 #include "llvm/Support/TargetRegistry.h" 27 #include "llvm/Support/raw_ostream.h" 28 29 using namespace llvm; 30 31 typedef MCDisassembler::DecodeStatus DecodeStatus; 32 33 namespace { 34 /// ARMDisassembler - ARM disassembler for all ARM platforms. 35 class ARMDisassembler : public MCDisassembler { 36 public: 37 /// Constructor - Initializes the disassembler. 38 /// 39 ARMDisassembler(const MCSubtargetInfo &STI) : 40 MCDisassembler(STI) { 41 } 42 43 ~ARMDisassembler() { 44 } 45 46 /// getInstruction - See MCDisassembler. 47 DecodeStatus getInstruction(MCInst &instr, 48 uint64_t &size, 49 const MemoryObject ®ion, 50 uint64_t address, 51 raw_ostream &vStream, 52 raw_ostream &cStream) const; 53 54 /// getEDInfo - See MCDisassembler. 55 EDInstInfo *getEDInfo() const; 56 private: 57 }; 58 59 /// ThumbDisassembler - Thumb disassembler for all Thumb platforms. 60 class ThumbDisassembler : public MCDisassembler { 61 public: 62 /// Constructor - Initializes the disassembler. 63 /// 64 ThumbDisassembler(const MCSubtargetInfo &STI) : 65 MCDisassembler(STI) { 66 } 67 68 ~ThumbDisassembler() { 69 } 70 71 /// getInstruction - See MCDisassembler. 72 DecodeStatus getInstruction(MCInst &instr, 73 uint64_t &size, 74 const MemoryObject ®ion, 75 uint64_t address, 76 raw_ostream &vStream, 77 raw_ostream &cStream) const; 78 79 /// getEDInfo - See MCDisassembler. 80 EDInstInfo *getEDInfo() const; 81 private: 82 mutable std::vector<unsigned> ITBlock; 83 DecodeStatus AddThumbPredicate(MCInst&) const; 84 void UpdateThumbVFPPredicate(MCInst&) const; 85 }; 86 } 87 88 static bool Check(DecodeStatus &Out, DecodeStatus In) { 89 switch (In) { 90 case MCDisassembler::Success: 91 // Out stays the same. 92 return true; 93 case MCDisassembler::SoftFail: 94 Out = In; 95 return true; 96 case MCDisassembler::Fail: 97 Out = In; 98 return false; 99 } 100 return false; 101 } 102 103 104 // Forward declare these because the autogenerated code will reference them. 105 // Definitions are further down. 106 static DecodeStatus DecodeGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 107 uint64_t Address, const void *Decoder); 108 static DecodeStatus DecodeGPRnopcRegisterClass(llvm::MCInst &Inst, 109 unsigned RegNo, uint64_t Address, 110 const void *Decoder); 111 static DecodeStatus DecodetGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 112 uint64_t Address, const void *Decoder); 113 static DecodeStatus DecodetcGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 114 uint64_t Address, const void *Decoder); 115 static DecodeStatus DecoderGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 116 uint64_t Address, const void *Decoder); 117 static DecodeStatus DecodeSPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 118 uint64_t Address, const void *Decoder); 119 static DecodeStatus DecodeDPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 120 uint64_t Address, const void *Decoder); 121 static DecodeStatus DecodeDPR_8RegisterClass(llvm::MCInst &Inst, unsigned RegNo, 122 uint64_t Address, const void *Decoder); 123 static DecodeStatus DecodeDPR_VFP2RegisterClass(llvm::MCInst &Inst, 124 unsigned RegNo, 125 uint64_t Address, 126 const void *Decoder); 127 static DecodeStatus DecodeQPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 128 uint64_t Address, const void *Decoder); 129 130 static DecodeStatus DecodePredicateOperand(llvm::MCInst &Inst, unsigned Val, 131 uint64_t Address, const void *Decoder); 132 static DecodeStatus DecodeCCOutOperand(llvm::MCInst &Inst, unsigned Val, 133 uint64_t Address, const void *Decoder); 134 static DecodeStatus DecodeSOImmOperand(llvm::MCInst &Inst, unsigned Val, 135 uint64_t Address, const void *Decoder); 136 static DecodeStatus DecodeRegListOperand(llvm::MCInst &Inst, unsigned Val, 137 uint64_t Address, const void *Decoder); 138 static DecodeStatus DecodeSPRRegListOperand(llvm::MCInst &Inst, unsigned Val, 139 uint64_t Address, const void *Decoder); 140 static DecodeStatus DecodeDPRRegListOperand(llvm::MCInst &Inst, unsigned Val, 141 uint64_t Address, const void *Decoder); 142 143 static DecodeStatus DecodeBitfieldMaskOperand(llvm::MCInst &Inst, unsigned Insn, 144 uint64_t Address, const void *Decoder); 145 static DecodeStatus DecodeCopMemInstruction(llvm::MCInst &Inst, unsigned Insn, 146 uint64_t Address, const void *Decoder); 147 static DecodeStatus DecodeAddrMode2IdxInstruction(llvm::MCInst &Inst, 148 unsigned Insn, 149 uint64_t Address, 150 const void *Decoder); 151 static DecodeStatus DecodeSORegMemOperand(llvm::MCInst &Inst, unsigned Insn, 152 uint64_t Address, const void *Decoder); 153 static DecodeStatus DecodeAddrMode3Instruction(llvm::MCInst &Inst,unsigned Insn, 154 uint64_t Address, const void *Decoder); 155 static DecodeStatus DecodeSORegImmOperand(llvm::MCInst &Inst, unsigned Insn, 156 uint64_t Address, const void *Decoder); 157 static DecodeStatus DecodeSORegRegOperand(llvm::MCInst &Inst, unsigned Insn, 158 uint64_t Address, const void *Decoder); 159 160 static DecodeStatus DecodeMemMultipleWritebackInstruction(llvm::MCInst & Inst, 161 unsigned Insn, 162 uint64_t Adddress, 163 const void *Decoder); 164 static DecodeStatus DecodeT2MOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, 165 uint64_t Address, const void *Decoder); 166 static DecodeStatus DecodeArmMOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, 167 uint64_t Address, const void *Decoder); 168 static DecodeStatus DecodeSMLAInstruction(llvm::MCInst &Inst, unsigned Insn, 169 uint64_t Address, const void *Decoder); 170 static DecodeStatus DecodeCPSInstruction(llvm::MCInst &Inst, unsigned Insn, 171 uint64_t Address, const void *Decoder); 172 static DecodeStatus DecodeT2CPSInstruction(llvm::MCInst &Inst, unsigned Insn, 173 uint64_t Address, const void *Decoder); 174 static DecodeStatus DecodeAddrModeImm12Operand(llvm::MCInst &Inst, unsigned Val, 175 uint64_t Address, const void *Decoder); 176 static DecodeStatus DecodeAddrMode5Operand(llvm::MCInst &Inst, unsigned Val, 177 uint64_t Address, const void *Decoder); 178 static DecodeStatus DecodeAddrMode7Operand(llvm::MCInst &Inst, unsigned Val, 179 uint64_t Address, const void *Decoder); 180 static DecodeStatus DecodeBranchImmInstruction(llvm::MCInst &Inst,unsigned Insn, 181 uint64_t Address, const void *Decoder); 182 static DecodeStatus DecodeVCVTImmOperand(llvm::MCInst &Inst, unsigned Val, 183 uint64_t Address, const void *Decoder); 184 static DecodeStatus DecodeAddrMode6Operand(llvm::MCInst &Inst, unsigned Val, 185 uint64_t Address, const void *Decoder); 186 static DecodeStatus DecodeVLDInstruction(llvm::MCInst &Inst, unsigned Val, 187 uint64_t Address, const void *Decoder); 188 static DecodeStatus DecodeVSTInstruction(llvm::MCInst &Inst, unsigned Val, 189 uint64_t Address, const void *Decoder); 190 static DecodeStatus DecodeVLD1DupInstruction(llvm::MCInst &Inst, unsigned Val, 191 uint64_t Address, const void *Decoder); 192 static DecodeStatus DecodeVLD2DupInstruction(llvm::MCInst &Inst, unsigned Val, 193 uint64_t Address, const void *Decoder); 194 static DecodeStatus DecodeVLD3DupInstruction(llvm::MCInst &Inst, unsigned Val, 195 uint64_t Address, const void *Decoder); 196 static DecodeStatus DecodeVLD4DupInstruction(llvm::MCInst &Inst, unsigned Val, 197 uint64_t Address, const void *Decoder); 198 static DecodeStatus DecodeNEONModImmInstruction(llvm::MCInst &Inst,unsigned Val, 199 uint64_t Address, const void *Decoder); 200 static DecodeStatus DecodeVSHLMaxInstruction(llvm::MCInst &Inst, unsigned Val, 201 uint64_t Address, const void *Decoder); 202 static DecodeStatus DecodeShiftRight8Imm(llvm::MCInst &Inst, unsigned Val, 203 uint64_t Address, const void *Decoder); 204 static DecodeStatus DecodeShiftRight16Imm(llvm::MCInst &Inst, unsigned Val, 205 uint64_t Address, const void *Decoder); 206 static DecodeStatus DecodeShiftRight32Imm(llvm::MCInst &Inst, unsigned Val, 207 uint64_t Address, const void *Decoder); 208 static DecodeStatus DecodeShiftRight64Imm(llvm::MCInst &Inst, unsigned Val, 209 uint64_t Address, const void *Decoder); 210 static DecodeStatus DecodeTBLInstruction(llvm::MCInst &Inst, unsigned Insn, 211 uint64_t Address, const void *Decoder); 212 static DecodeStatus DecodePostIdxReg(llvm::MCInst &Inst, unsigned Insn, 213 uint64_t Address, const void *Decoder); 214 static DecodeStatus DecodeCoprocessor(llvm::MCInst &Inst, unsigned Insn, 215 uint64_t Address, const void *Decoder); 216 static DecodeStatus DecodeMemBarrierOption(llvm::MCInst &Inst, unsigned Insn, 217 uint64_t Address, const void *Decoder); 218 static DecodeStatus DecodeMSRMask(llvm::MCInst &Inst, unsigned Insn, 219 uint64_t Address, const void *Decoder); 220 static DecodeStatus DecodeDoubleRegLoad(llvm::MCInst &Inst, unsigned Insn, 221 uint64_t Address, const void *Decoder); 222 static DecodeStatus DecodeDoubleRegStore(llvm::MCInst &Inst, unsigned Insn, 223 uint64_t Address, const void *Decoder); 224 static DecodeStatus DecodeLDRPreImm(llvm::MCInst &Inst, unsigned Insn, 225 uint64_t Address, const void *Decoder); 226 static DecodeStatus DecodeLDRPreReg(llvm::MCInst &Inst, unsigned Insn, 227 uint64_t Address, const void *Decoder); 228 static DecodeStatus DecodeSTRPreImm(llvm::MCInst &Inst, unsigned Insn, 229 uint64_t Address, const void *Decoder); 230 static DecodeStatus DecodeSTRPreReg(llvm::MCInst &Inst, unsigned Insn, 231 uint64_t Address, const void *Decoder); 232 static DecodeStatus DecodeVLD1LN(llvm::MCInst &Inst, unsigned Insn, 233 uint64_t Address, const void *Decoder); 234 static DecodeStatus DecodeVLD2LN(llvm::MCInst &Inst, unsigned Insn, 235 uint64_t Address, const void *Decoder); 236 static DecodeStatus DecodeVLD3LN(llvm::MCInst &Inst, unsigned Insn, 237 uint64_t Address, const void *Decoder); 238 static DecodeStatus DecodeVLD4LN(llvm::MCInst &Inst, unsigned Insn, 239 uint64_t Address, const void *Decoder); 240 static DecodeStatus DecodeVST1LN(llvm::MCInst &Inst, unsigned Insn, 241 uint64_t Address, const void *Decoder); 242 static DecodeStatus DecodeVST2LN(llvm::MCInst &Inst, unsigned Insn, 243 uint64_t Address, const void *Decoder); 244 static DecodeStatus DecodeVST3LN(llvm::MCInst &Inst, unsigned Insn, 245 uint64_t Address, const void *Decoder); 246 static DecodeStatus DecodeVST4LN(llvm::MCInst &Inst, unsigned Insn, 247 uint64_t Address, const void *Decoder); 248 static DecodeStatus DecodeVMOVSRR(llvm::MCInst &Inst, unsigned Insn, 249 uint64_t Address, const void *Decoder); 250 static DecodeStatus DecodeVMOVRRS(llvm::MCInst &Inst, unsigned Insn, 251 uint64_t Address, const void *Decoder); 252 253 static DecodeStatus DecodeThumbAddSpecialReg(llvm::MCInst &Inst, uint16_t Insn, 254 uint64_t Address, const void *Decoder); 255 static DecodeStatus DecodeThumbBROperand(llvm::MCInst &Inst, unsigned Val, 256 uint64_t Address, const void *Decoder); 257 static DecodeStatus DecodeT2BROperand(llvm::MCInst &Inst, unsigned Val, 258 uint64_t Address, const void *Decoder); 259 static DecodeStatus DecodeThumbCmpBROperand(llvm::MCInst &Inst, unsigned Val, 260 uint64_t Address, const void *Decoder); 261 static DecodeStatus DecodeThumbAddrModeRR(llvm::MCInst &Inst, unsigned Val, 262 uint64_t Address, const void *Decoder); 263 static DecodeStatus DecodeThumbAddrModeIS(llvm::MCInst &Inst, unsigned Val, 264 uint64_t Address, const void *Decoder); 265 static DecodeStatus DecodeThumbAddrModePC(llvm::MCInst &Inst, unsigned Val, 266 uint64_t Address, const void *Decoder); 267 static DecodeStatus DecodeThumbAddrModeSP(llvm::MCInst &Inst, unsigned Val, 268 uint64_t Address, const void *Decoder); 269 static DecodeStatus DecodeT2AddrModeSOReg(llvm::MCInst &Inst, unsigned Val, 270 uint64_t Address, const void *Decoder); 271 static DecodeStatus DecodeT2LoadShift(llvm::MCInst &Inst, unsigned Val, 272 uint64_t Address, const void *Decoder); 273 static DecodeStatus DecodeT2Imm8S4(llvm::MCInst &Inst, unsigned Val, 274 uint64_t Address, const void *Decoder); 275 static DecodeStatus DecodeT2AddrModeImm8s4(llvm::MCInst &Inst, unsigned Val, 276 uint64_t Address, const void *Decoder); 277 static DecodeStatus DecodeT2AddrModeImm0_1020s4(llvm::MCInst &Inst,unsigned Val, 278 uint64_t Address, const void *Decoder); 279 static DecodeStatus DecodeT2Imm8(llvm::MCInst &Inst, unsigned Val, 280 uint64_t Address, const void *Decoder); 281 static DecodeStatus DecodeT2AddrModeImm8(llvm::MCInst &Inst, unsigned Val, 282 uint64_t Address, const void *Decoder); 283 static DecodeStatus DecodeThumbAddSPImm(llvm::MCInst &Inst, uint16_t Val, 284 uint64_t Address, const void *Decoder); 285 static DecodeStatus DecodeThumbAddSPReg(llvm::MCInst &Inst, uint16_t Insn, 286 uint64_t Address, const void *Decoder); 287 static DecodeStatus DecodeThumbCPS(llvm::MCInst &Inst, uint16_t Insn, 288 uint64_t Address, const void *Decoder); 289 static DecodeStatus DecodeThumbBLXOffset(llvm::MCInst &Inst, unsigned Insn, 290 uint64_t Address, const void *Decoder); 291 static DecodeStatus DecodeT2AddrModeImm12(llvm::MCInst &Inst, unsigned Val, 292 uint64_t Address, const void *Decoder); 293 static DecodeStatus DecodeThumbTableBranch(llvm::MCInst &Inst, unsigned Val, 294 uint64_t Address, const void *Decoder); 295 static DecodeStatus DecodeThumb2BCCInstruction(llvm::MCInst &Inst, unsigned Val, 296 uint64_t Address, const void *Decoder); 297 static DecodeStatus DecodeT2SOImm(llvm::MCInst &Inst, unsigned Val, 298 uint64_t Address, const void *Decoder); 299 static DecodeStatus DecodeThumbBCCTargetOperand(llvm::MCInst &Inst,unsigned Val, 300 uint64_t Address, const void *Decoder); 301 static DecodeStatus DecodeThumbBLTargetOperand(llvm::MCInst &Inst, unsigned Val, 302 uint64_t Address, const void *Decoder); 303 static DecodeStatus DecodeIT(llvm::MCInst &Inst, unsigned Val, 304 uint64_t Address, const void *Decoder); 305 static DecodeStatus DecodeT2LDRDPreInstruction(llvm::MCInst &Inst,unsigned Insn, 306 uint64_t Address, const void *Decoder); 307 static DecodeStatus DecodeT2STRDPreInstruction(llvm::MCInst &Inst,unsigned Insn, 308 uint64_t Address, const void *Decoder); 309 static DecodeStatus DecodeT2Adr(llvm::MCInst &Inst, unsigned Val, 310 uint64_t Address, const void *Decoder); 311 static DecodeStatus DecodeT2LdStPre(llvm::MCInst &Inst, unsigned Val, 312 uint64_t Address, const void *Decoder); 313 static DecodeStatus DecodeT2ShifterImmOperand(llvm::MCInst &Inst, unsigned Val, 314 uint64_t Address, const void *Decoder); 315 316 317 318 #include "ARMGenDisassemblerTables.inc" 319 #include "ARMGenInstrInfo.inc" 320 #include "ARMGenEDInfo.inc" 321 322 static MCDisassembler *createARMDisassembler(const Target &T, const MCSubtargetInfo &STI) { 323 return new ARMDisassembler(STI); 324 } 325 326 static MCDisassembler *createThumbDisassembler(const Target &T, const MCSubtargetInfo &STI) { 327 return new ThumbDisassembler(STI); 328 } 329 330 EDInstInfo *ARMDisassembler::getEDInfo() const { 331 return instInfoARM; 332 } 333 334 EDInstInfo *ThumbDisassembler::getEDInfo() const { 335 return instInfoARM; 336 } 337 338 DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size, 339 const MemoryObject &Region, 340 uint64_t Address, 341 raw_ostream &os, 342 raw_ostream &cs) const { 343 CommentStream = &cs; 344 345 uint8_t bytes[4]; 346 347 assert(!(STI.getFeatureBits() & ARM::ModeThumb) && 348 "Asked to disassemble an ARM instruction but Subtarget is in Thumb mode!"); 349 350 // We want to read exactly 4 bytes of data. 351 if (Region.readBytes(Address, 4, (uint8_t*)bytes, NULL) == -1) { 352 Size = 0; 353 return MCDisassembler::Fail; 354 } 355 356 // Encoded as a small-endian 32-bit word in the stream. 357 uint32_t insn = (bytes[3] << 24) | 358 (bytes[2] << 16) | 359 (bytes[1] << 8) | 360 (bytes[0] << 0); 361 362 // Calling the auto-generated decoder function. 363 DecodeStatus result = decodeARMInstruction32(MI, insn, Address, this, STI); 364 if (result != MCDisassembler::Fail) { 365 Size = 4; 366 return result; 367 } 368 369 // VFP and NEON instructions, similarly, are shared between ARM 370 // and Thumb modes. 371 MI.clear(); 372 result = decodeVFPInstruction32(MI, insn, Address, this, STI); 373 if (result != MCDisassembler::Fail) { 374 Size = 4; 375 return result; 376 } 377 378 MI.clear(); 379 result = decodeNEONDataInstruction32(MI, insn, Address, this, STI); 380 if (result != MCDisassembler::Fail) { 381 Size = 4; 382 // Add a fake predicate operand, because we share these instruction 383 // definitions with Thumb2 where these instructions are predicable. 384 if (!DecodePredicateOperand(MI, 0xE, Address, this)) 385 return MCDisassembler::Fail; 386 return result; 387 } 388 389 MI.clear(); 390 result = decodeNEONLoadStoreInstruction32(MI, insn, Address, this, STI); 391 if (result != MCDisassembler::Fail) { 392 Size = 4; 393 // Add a fake predicate operand, because we share these instruction 394 // definitions with Thumb2 where these instructions are predicable. 395 if (!DecodePredicateOperand(MI, 0xE, Address, this)) 396 return MCDisassembler::Fail; 397 return result; 398 } 399 400 MI.clear(); 401 result = decodeNEONDupInstruction32(MI, insn, Address, this, STI); 402 if (result != MCDisassembler::Fail) { 403 Size = 4; 404 // Add a fake predicate operand, because we share these instruction 405 // definitions with Thumb2 where these instructions are predicable. 406 if (!DecodePredicateOperand(MI, 0xE, Address, this)) 407 return MCDisassembler::Fail; 408 return result; 409 } 410 411 MI.clear(); 412 413 Size = 0; 414 return MCDisassembler::Fail; 415 } 416 417 namespace llvm { 418 extern const MCInstrDesc ARMInsts[]; 419 } 420 421 /// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the 422 /// immediate Value in the MCInst. The immediate Value has had any PC 423 /// adjustment made by the caller. If the instruction is a branch instruction 424 /// then isBranch is true, else false. If the getOpInfo() function was set as 425 /// part of the setupForSymbolicDisassembly() call then that function is called 426 /// to get any symbolic information at the Address for this instruction. If 427 /// that returns non-zero then the symbolic information it returns is used to 428 /// create an MCExpr and that is added as an operand to the MCInst. If 429 /// getOpInfo() returns zero and isBranch is true then a symbol look up for 430 /// Value is done and if a symbol is found an MCExpr is created with that, else 431 /// an MCExpr with Value is created. This function returns true if it adds an 432 /// operand to the MCInst and false otherwise. 433 static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value, 434 bool isBranch, uint64_t InstSize, 435 MCInst &MI, const void *Decoder) { 436 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); 437 LLVMOpInfoCallback getOpInfo = Dis->getLLVMOpInfoCallback(); 438 if (!getOpInfo) 439 return false; 440 441 struct LLVMOpInfo1 SymbolicOp; 442 SymbolicOp.Value = Value; 443 void *DisInfo = Dis->getDisInfoBlock(); 444 if (!getOpInfo(DisInfo, Address, 0 /* Offset */, InstSize, 1, &SymbolicOp)) { 445 if (isBranch) { 446 LLVMSymbolLookupCallback SymbolLookUp = 447 Dis->getLLVMSymbolLookupCallback(); 448 if (SymbolLookUp) { 449 uint64_t ReferenceType; 450 ReferenceType = LLVMDisassembler_ReferenceType_In_Branch; 451 const char *ReferenceName; 452 const char *Name = SymbolLookUp(DisInfo, Value, &ReferenceType, Address, 453 &ReferenceName); 454 if (Name) { 455 SymbolicOp.AddSymbol.Name = Name; 456 SymbolicOp.AddSymbol.Present = true; 457 SymbolicOp.Value = 0; 458 } 459 else { 460 SymbolicOp.Value = Value; 461 } 462 if(ReferenceType == LLVMDisassembler_ReferenceType_Out_SymbolStub) 463 (*Dis->CommentStream) << "symbol stub for: " << ReferenceName; 464 } 465 else { 466 return false; 467 } 468 } 469 else { 470 return false; 471 } 472 } 473 474 MCContext *Ctx = Dis->getMCContext(); 475 const MCExpr *Add = NULL; 476 if (SymbolicOp.AddSymbol.Present) { 477 if (SymbolicOp.AddSymbol.Name) { 478 StringRef Name(SymbolicOp.AddSymbol.Name); 479 MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name); 480 Add = MCSymbolRefExpr::Create(Sym, *Ctx); 481 } else { 482 Add = MCConstantExpr::Create(SymbolicOp.AddSymbol.Value, *Ctx); 483 } 484 } 485 486 const MCExpr *Sub = NULL; 487 if (SymbolicOp.SubtractSymbol.Present) { 488 if (SymbolicOp.SubtractSymbol.Name) { 489 StringRef Name(SymbolicOp.SubtractSymbol.Name); 490 MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name); 491 Sub = MCSymbolRefExpr::Create(Sym, *Ctx); 492 } else { 493 Sub = MCConstantExpr::Create(SymbolicOp.SubtractSymbol.Value, *Ctx); 494 } 495 } 496 497 const MCExpr *Off = NULL; 498 if (SymbolicOp.Value != 0) 499 Off = MCConstantExpr::Create(SymbolicOp.Value, *Ctx); 500 501 const MCExpr *Expr; 502 if (Sub) { 503 const MCExpr *LHS; 504 if (Add) 505 LHS = MCBinaryExpr::CreateSub(Add, Sub, *Ctx); 506 else 507 LHS = MCUnaryExpr::CreateMinus(Sub, *Ctx); 508 if (Off != 0) 509 Expr = MCBinaryExpr::CreateAdd(LHS, Off, *Ctx); 510 else 511 Expr = LHS; 512 } else if (Add) { 513 if (Off != 0) 514 Expr = MCBinaryExpr::CreateAdd(Add, Off, *Ctx); 515 else 516 Expr = Add; 517 } else { 518 if (Off != 0) 519 Expr = Off; 520 else 521 Expr = MCConstantExpr::Create(0, *Ctx); 522 } 523 524 if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_HI16) 525 MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateUpper16(Expr, *Ctx))); 526 else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_LO16) 527 MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateLower16(Expr, *Ctx))); 528 else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_None) 529 MI.addOperand(MCOperand::CreateExpr(Expr)); 530 else 531 assert(0 && "bad SymbolicOp.VariantKind"); 532 533 return true; 534 } 535 536 /// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being 537 /// referenced by a load instruction with the base register that is the Pc. 538 /// These can often be values in a literal pool near the Address of the 539 /// instruction. The Address of the instruction and its immediate Value are 540 /// used as a possible literal pool entry. The SymbolLookUp call back will 541 /// return the name of a symbol referenced by the the literal pool's entry if 542 /// the referenced address is that of a symbol. Or it will return a pointer to 543 /// a literal 'C' string if the referenced address of the literal pool's entry 544 /// is an address into a section with 'C' string literals. 545 static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value, 546 const void *Decoder) { 547 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); 548 LLVMSymbolLookupCallback SymbolLookUp = Dis->getLLVMSymbolLookupCallback(); 549 if (SymbolLookUp) { 550 void *DisInfo = Dis->getDisInfoBlock(); 551 uint64_t ReferenceType; 552 ReferenceType = LLVMDisassembler_ReferenceType_In_PCrel_Load; 553 const char *ReferenceName; 554 (void)SymbolLookUp(DisInfo, Value, &ReferenceType, Address, &ReferenceName); 555 if(ReferenceType == LLVMDisassembler_ReferenceType_Out_LitPool_SymAddr || 556 ReferenceType == LLVMDisassembler_ReferenceType_Out_LitPool_CstrAddr) 557 (*Dis->CommentStream) << "literal pool for: " << ReferenceName; 558 } 559 } 560 561 // Thumb1 instructions don't have explicit S bits. Rather, they 562 // implicitly set CPSR. Since it's not represented in the encoding, the 563 // auto-generated decoder won't inject the CPSR operand. We need to fix 564 // that as a post-pass. 565 static void AddThumb1SBit(MCInst &MI, bool InITBlock) { 566 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; 567 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; 568 MCInst::iterator I = MI.begin(); 569 for (unsigned i = 0; i < NumOps; ++i, ++I) { 570 if (I == MI.end()) break; 571 if (OpInfo[i].isOptionalDef() && OpInfo[i].RegClass == ARM::CCRRegClassID) { 572 if (i > 0 && OpInfo[i-1].isPredicate()) continue; 573 MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR)); 574 return; 575 } 576 } 577 578 MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR)); 579 } 580 581 // Most Thumb instructions don't have explicit predicates in the 582 // encoding, but rather get their predicates from IT context. We need 583 // to fix up the predicate operands using this context information as a 584 // post-pass. 585 MCDisassembler::DecodeStatus 586 ThumbDisassembler::AddThumbPredicate(MCInst &MI) const { 587 MCDisassembler::DecodeStatus S = Success; 588 589 // A few instructions actually have predicates encoded in them. Don't 590 // try to overwrite it if we're seeing one of those. 591 switch (MI.getOpcode()) { 592 case ARM::tBcc: 593 case ARM::t2Bcc: 594 case ARM::tCBZ: 595 case ARM::tCBNZ: 596 case ARM::tCPS: 597 case ARM::t2CPS3p: 598 case ARM::t2CPS2p: 599 case ARM::t2CPS1p: 600 case ARM::tMOVSr: 601 case ARM::tSETEND: 602 // Some instructions (mostly conditional branches) are not 603 // allowed in IT blocks. 604 if (!ITBlock.empty()) 605 S = SoftFail; 606 else 607 return Success; 608 break; 609 case ARM::tB: 610 case ARM::t2B: 611 case ARM::t2TBB: 612 case ARM::t2TBH: 613 // Some instructions (mostly unconditional branches) can 614 // only appears at the end of, or outside of, an IT. 615 if (ITBlock.size() > 1) 616 S = SoftFail; 617 break; 618 default: 619 break; 620 } 621 622 // If we're in an IT block, base the predicate on that. Otherwise, 623 // assume a predicate of AL. 624 unsigned CC; 625 if (!ITBlock.empty()) { 626 CC = ITBlock.back(); 627 if (CC == 0xF) 628 CC = ARMCC::AL; 629 ITBlock.pop_back(); 630 } else 631 CC = ARMCC::AL; 632 633 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; 634 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; 635 MCInst::iterator I = MI.begin(); 636 for (unsigned i = 0; i < NumOps; ++i, ++I) { 637 if (I == MI.end()) break; 638 if (OpInfo[i].isPredicate()) { 639 I = MI.insert(I, MCOperand::CreateImm(CC)); 640 ++I; 641 if (CC == ARMCC::AL) 642 MI.insert(I, MCOperand::CreateReg(0)); 643 else 644 MI.insert(I, MCOperand::CreateReg(ARM::CPSR)); 645 return S; 646 } 647 } 648 649 I = MI.insert(I, MCOperand::CreateImm(CC)); 650 ++I; 651 if (CC == ARMCC::AL) 652 MI.insert(I, MCOperand::CreateReg(0)); 653 else 654 MI.insert(I, MCOperand::CreateReg(ARM::CPSR)); 655 656 return S; 657 } 658 659 // Thumb VFP instructions are a special case. Because we share their 660 // encodings between ARM and Thumb modes, and they are predicable in ARM 661 // mode, the auto-generated decoder will give them an (incorrect) 662 // predicate operand. We need to rewrite these operands based on the IT 663 // context as a post-pass. 664 void ThumbDisassembler::UpdateThumbVFPPredicate(MCInst &MI) const { 665 unsigned CC; 666 if (!ITBlock.empty()) { 667 CC = ITBlock.back(); 668 ITBlock.pop_back(); 669 } else 670 CC = ARMCC::AL; 671 672 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; 673 MCInst::iterator I = MI.begin(); 674 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; 675 for (unsigned i = 0; i < NumOps; ++i, ++I) { 676 if (OpInfo[i].isPredicate() ) { 677 I->setImm(CC); 678 ++I; 679 if (CC == ARMCC::AL) 680 I->setReg(0); 681 else 682 I->setReg(ARM::CPSR); 683 return; 684 } 685 } 686 } 687 688 DecodeStatus ThumbDisassembler::getInstruction(MCInst &MI, uint64_t &Size, 689 const MemoryObject &Region, 690 uint64_t Address, 691 raw_ostream &os, 692 raw_ostream &cs) const { 693 CommentStream = &cs; 694 695 uint8_t bytes[4]; 696 697 assert((STI.getFeatureBits() & ARM::ModeThumb) && 698 "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!"); 699 700 // We want to read exactly 2 bytes of data. 701 if (Region.readBytes(Address, 2, (uint8_t*)bytes, NULL) == -1) { 702 Size = 0; 703 return MCDisassembler::Fail; 704 } 705 706 uint16_t insn16 = (bytes[1] << 8) | bytes[0]; 707 DecodeStatus result = decodeThumbInstruction16(MI, insn16, Address, this, STI); 708 if (result != MCDisassembler::Fail) { 709 Size = 2; 710 Check(result, AddThumbPredicate(MI)); 711 return result; 712 } 713 714 MI.clear(); 715 result = decodeThumbSBitInstruction16(MI, insn16, Address, this, STI); 716 if (result) { 717 Size = 2; 718 bool InITBlock = !ITBlock.empty(); 719 Check(result, AddThumbPredicate(MI)); 720 AddThumb1SBit(MI, InITBlock); 721 return result; 722 } 723 724 MI.clear(); 725 result = decodeThumb2Instruction16(MI, insn16, Address, this, STI); 726 if (result != MCDisassembler::Fail) { 727 Size = 2; 728 729 // Nested IT blocks are UNPREDICTABLE. Must be checked before we add 730 // the Thumb predicate. 731 if (MI.getOpcode() == ARM::t2IT && !ITBlock.empty()) 732 result = MCDisassembler::SoftFail; 733 734 Check(result, AddThumbPredicate(MI)); 735 736 // If we find an IT instruction, we need to parse its condition 737 // code and mask operands so that we can apply them correctly 738 // to the subsequent instructions. 739 if (MI.getOpcode() == ARM::t2IT) { 740 741 // (3 - the number of trailing zeros) is the number of then / else. 742 unsigned firstcond = MI.getOperand(0).getImm(); 743 unsigned Mask = MI.getOperand(1).getImm(); 744 unsigned CondBit0 = Mask >> 4 & 1; 745 unsigned NumTZ = CountTrailingZeros_32(Mask); 746 assert(NumTZ <= 3 && "Invalid IT mask!"); 747 for (unsigned Pos = 3, e = NumTZ; Pos > e; --Pos) { 748 bool T = ((Mask >> Pos) & 1) == CondBit0; 749 if (T) 750 ITBlock.insert(ITBlock.begin(), firstcond); 751 else 752 ITBlock.insert(ITBlock.begin(), firstcond ^ 1); 753 } 754 755 ITBlock.push_back(firstcond); 756 } 757 758 return result; 759 } 760 761 // We want to read exactly 4 bytes of data. 762 if (Region.readBytes(Address, 4, (uint8_t*)bytes, NULL) == -1) { 763 Size = 0; 764 return MCDisassembler::Fail; 765 } 766 767 uint32_t insn32 = (bytes[3] << 8) | 768 (bytes[2] << 0) | 769 (bytes[1] << 24) | 770 (bytes[0] << 16); 771 MI.clear(); 772 result = decodeThumbInstruction32(MI, insn32, Address, this, STI); 773 if (result != MCDisassembler::Fail) { 774 Size = 4; 775 bool InITBlock = ITBlock.size(); 776 Check(result, AddThumbPredicate(MI)); 777 AddThumb1SBit(MI, InITBlock); 778 return result; 779 } 780 781 MI.clear(); 782 result = decodeThumb2Instruction32(MI, insn32, Address, this, STI); 783 if (result != MCDisassembler::Fail) { 784 Size = 4; 785 Check(result, AddThumbPredicate(MI)); 786 return result; 787 } 788 789 MI.clear(); 790 result = decodeVFPInstruction32(MI, insn32, Address, this, STI); 791 if (result != MCDisassembler::Fail) { 792 Size = 4; 793 UpdateThumbVFPPredicate(MI); 794 return result; 795 } 796 797 MI.clear(); 798 result = decodeNEONDupInstruction32(MI, insn32, Address, this, STI); 799 if (result != MCDisassembler::Fail) { 800 Size = 4; 801 Check(result, AddThumbPredicate(MI)); 802 return result; 803 } 804 805 if (fieldFromInstruction32(insn32, 24, 8) == 0xF9) { 806 MI.clear(); 807 uint32_t NEONLdStInsn = insn32; 808 NEONLdStInsn &= 0xF0FFFFFF; 809 NEONLdStInsn |= 0x04000000; 810 result = decodeNEONLoadStoreInstruction32(MI, NEONLdStInsn, Address, this, STI); 811 if (result != MCDisassembler::Fail) { 812 Size = 4; 813 Check(result, AddThumbPredicate(MI)); 814 return result; 815 } 816 } 817 818 if (fieldFromInstruction32(insn32, 24, 4) == 0xF) { 819 MI.clear(); 820 uint32_t NEONDataInsn = insn32; 821 NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24 822 NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24 823 NEONDataInsn |= 0x12000000; // Set bits 28 and 25 824 result = decodeNEONDataInstruction32(MI, NEONDataInsn, Address, this, STI); 825 if (result != MCDisassembler::Fail) { 826 Size = 4; 827 Check(result, AddThumbPredicate(MI)); 828 return result; 829 } 830 } 831 832 Size = 0; 833 return MCDisassembler::Fail; 834 } 835 836 837 extern "C" void LLVMInitializeARMDisassembler() { 838 TargetRegistry::RegisterMCDisassembler(TheARMTarget, 839 createARMDisassembler); 840 TargetRegistry::RegisterMCDisassembler(TheThumbTarget, 841 createThumbDisassembler); 842 } 843 844 static const unsigned GPRDecoderTable[] = { 845 ARM::R0, ARM::R1, ARM::R2, ARM::R3, 846 ARM::R4, ARM::R5, ARM::R6, ARM::R7, 847 ARM::R8, ARM::R9, ARM::R10, ARM::R11, 848 ARM::R12, ARM::SP, ARM::LR, ARM::PC 849 }; 850 851 static DecodeStatus DecodeGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 852 uint64_t Address, const void *Decoder) { 853 if (RegNo > 15) 854 return MCDisassembler::Fail; 855 856 unsigned Register = GPRDecoderTable[RegNo]; 857 Inst.addOperand(MCOperand::CreateReg(Register)); 858 return MCDisassembler::Success; 859 } 860 861 static DecodeStatus 862 DecodeGPRnopcRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 863 uint64_t Address, const void *Decoder) { 864 if (RegNo == 15) return MCDisassembler::Fail; 865 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); 866 } 867 868 static DecodeStatus DecodetGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 869 uint64_t Address, const void *Decoder) { 870 if (RegNo > 7) 871 return MCDisassembler::Fail; 872 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); 873 } 874 875 static DecodeStatus DecodetcGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 876 uint64_t Address, const void *Decoder) { 877 unsigned Register = 0; 878 switch (RegNo) { 879 case 0: 880 Register = ARM::R0; 881 break; 882 case 1: 883 Register = ARM::R1; 884 break; 885 case 2: 886 Register = ARM::R2; 887 break; 888 case 3: 889 Register = ARM::R3; 890 break; 891 case 9: 892 Register = ARM::R9; 893 break; 894 case 12: 895 Register = ARM::R12; 896 break; 897 default: 898 return MCDisassembler::Fail; 899 } 900 901 Inst.addOperand(MCOperand::CreateReg(Register)); 902 return MCDisassembler::Success; 903 } 904 905 static DecodeStatus DecoderGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 906 uint64_t Address, const void *Decoder) { 907 if (RegNo == 13 || RegNo == 15) return MCDisassembler::Fail; 908 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); 909 } 910 911 static const unsigned SPRDecoderTable[] = { 912 ARM::S0, ARM::S1, ARM::S2, ARM::S3, 913 ARM::S4, ARM::S5, ARM::S6, ARM::S7, 914 ARM::S8, ARM::S9, ARM::S10, ARM::S11, 915 ARM::S12, ARM::S13, ARM::S14, ARM::S15, 916 ARM::S16, ARM::S17, ARM::S18, ARM::S19, 917 ARM::S20, ARM::S21, ARM::S22, ARM::S23, 918 ARM::S24, ARM::S25, ARM::S26, ARM::S27, 919 ARM::S28, ARM::S29, ARM::S30, ARM::S31 920 }; 921 922 static DecodeStatus DecodeSPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 923 uint64_t Address, const void *Decoder) { 924 if (RegNo > 31) 925 return MCDisassembler::Fail; 926 927 unsigned Register = SPRDecoderTable[RegNo]; 928 Inst.addOperand(MCOperand::CreateReg(Register)); 929 return MCDisassembler::Success; 930 } 931 932 static const unsigned DPRDecoderTable[] = { 933 ARM::D0, ARM::D1, ARM::D2, ARM::D3, 934 ARM::D4, ARM::D5, ARM::D6, ARM::D7, 935 ARM::D8, ARM::D9, ARM::D10, ARM::D11, 936 ARM::D12, ARM::D13, ARM::D14, ARM::D15, 937 ARM::D16, ARM::D17, ARM::D18, ARM::D19, 938 ARM::D20, ARM::D21, ARM::D22, ARM::D23, 939 ARM::D24, ARM::D25, ARM::D26, ARM::D27, 940 ARM::D28, ARM::D29, ARM::D30, ARM::D31 941 }; 942 943 static DecodeStatus DecodeDPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 944 uint64_t Address, const void *Decoder) { 945 if (RegNo > 31) 946 return MCDisassembler::Fail; 947 948 unsigned Register = DPRDecoderTable[RegNo]; 949 Inst.addOperand(MCOperand::CreateReg(Register)); 950 return MCDisassembler::Success; 951 } 952 953 static DecodeStatus DecodeDPR_8RegisterClass(llvm::MCInst &Inst, unsigned RegNo, 954 uint64_t Address, const void *Decoder) { 955 if (RegNo > 7) 956 return MCDisassembler::Fail; 957 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); 958 } 959 960 static DecodeStatus 961 DecodeDPR_VFP2RegisterClass(llvm::MCInst &Inst, unsigned RegNo, 962 uint64_t Address, const void *Decoder) { 963 if (RegNo > 15) 964 return MCDisassembler::Fail; 965 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); 966 } 967 968 static const unsigned QPRDecoderTable[] = { 969 ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3, 970 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7, 971 ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11, 972 ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15 973 }; 974 975 976 static DecodeStatus DecodeQPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, 977 uint64_t Address, const void *Decoder) { 978 if (RegNo > 31) 979 return MCDisassembler::Fail; 980 RegNo >>= 1; 981 982 unsigned Register = QPRDecoderTable[RegNo]; 983 Inst.addOperand(MCOperand::CreateReg(Register)); 984 return MCDisassembler::Success; 985 } 986 987 static DecodeStatus DecodePredicateOperand(llvm::MCInst &Inst, unsigned Val, 988 uint64_t Address, const void *Decoder) { 989 if (Val == 0xF) return MCDisassembler::Fail; 990 // AL predicate is not allowed on Thumb1 branches. 991 if (Inst.getOpcode() == ARM::tBcc && Val == 0xE) 992 return MCDisassembler::Fail; 993 Inst.addOperand(MCOperand::CreateImm(Val)); 994 if (Val == ARMCC::AL) { 995 Inst.addOperand(MCOperand::CreateReg(0)); 996 } else 997 Inst.addOperand(MCOperand::CreateReg(ARM::CPSR)); 998 return MCDisassembler::Success; 999 } 1000 1001 static DecodeStatus DecodeCCOutOperand(llvm::MCInst &Inst, unsigned Val, 1002 uint64_t Address, const void *Decoder) { 1003 if (Val) 1004 Inst.addOperand(MCOperand::CreateReg(ARM::CPSR)); 1005 else 1006 Inst.addOperand(MCOperand::CreateReg(0)); 1007 return MCDisassembler::Success; 1008 } 1009 1010 static DecodeStatus DecodeSOImmOperand(llvm::MCInst &Inst, unsigned Val, 1011 uint64_t Address, const void *Decoder) { 1012 uint32_t imm = Val & 0xFF; 1013 uint32_t rot = (Val & 0xF00) >> 7; 1014 uint32_t rot_imm = (imm >> rot) | (imm << ((32-rot) & 0x1F)); 1015 Inst.addOperand(MCOperand::CreateImm(rot_imm)); 1016 return MCDisassembler::Success; 1017 } 1018 1019 static DecodeStatus DecodeSORegImmOperand(llvm::MCInst &Inst, unsigned Val, 1020 uint64_t Address, const void *Decoder) { 1021 DecodeStatus S = MCDisassembler::Success; 1022 1023 unsigned Rm = fieldFromInstruction32(Val, 0, 4); 1024 unsigned type = fieldFromInstruction32(Val, 5, 2); 1025 unsigned imm = fieldFromInstruction32(Val, 7, 5); 1026 1027 // Register-immediate 1028 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1029 return MCDisassembler::Fail; 1030 1031 ARM_AM::ShiftOpc Shift = ARM_AM::lsl; 1032 switch (type) { 1033 case 0: 1034 Shift = ARM_AM::lsl; 1035 break; 1036 case 1: 1037 Shift = ARM_AM::lsr; 1038 break; 1039 case 2: 1040 Shift = ARM_AM::asr; 1041 break; 1042 case 3: 1043 Shift = ARM_AM::ror; 1044 break; 1045 } 1046 1047 if (Shift == ARM_AM::ror && imm == 0) 1048 Shift = ARM_AM::rrx; 1049 1050 unsigned Op = Shift | (imm << 3); 1051 Inst.addOperand(MCOperand::CreateImm(Op)); 1052 1053 return S; 1054 } 1055 1056 static DecodeStatus DecodeSORegRegOperand(llvm::MCInst &Inst, unsigned Val, 1057 uint64_t Address, const void *Decoder) { 1058 DecodeStatus S = MCDisassembler::Success; 1059 1060 unsigned Rm = fieldFromInstruction32(Val, 0, 4); 1061 unsigned type = fieldFromInstruction32(Val, 5, 2); 1062 unsigned Rs = fieldFromInstruction32(Val, 8, 4); 1063 1064 // Register-register 1065 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1066 return MCDisassembler::Fail; 1067 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder))) 1068 return MCDisassembler::Fail; 1069 1070 ARM_AM::ShiftOpc Shift = ARM_AM::lsl; 1071 switch (type) { 1072 case 0: 1073 Shift = ARM_AM::lsl; 1074 break; 1075 case 1: 1076 Shift = ARM_AM::lsr; 1077 break; 1078 case 2: 1079 Shift = ARM_AM::asr; 1080 break; 1081 case 3: 1082 Shift = ARM_AM::ror; 1083 break; 1084 } 1085 1086 Inst.addOperand(MCOperand::CreateImm(Shift)); 1087 1088 return S; 1089 } 1090 1091 static DecodeStatus DecodeRegListOperand(llvm::MCInst &Inst, unsigned Val, 1092 uint64_t Address, const void *Decoder) { 1093 DecodeStatus S = MCDisassembler::Success; 1094 1095 bool writebackLoad = false; 1096 unsigned writebackReg = 0; 1097 switch (Inst.getOpcode()) { 1098 default: 1099 break; 1100 case ARM::LDMIA_UPD: 1101 case ARM::LDMDB_UPD: 1102 case ARM::LDMIB_UPD: 1103 case ARM::LDMDA_UPD: 1104 case ARM::t2LDMIA_UPD: 1105 case ARM::t2LDMDB_UPD: 1106 writebackLoad = true; 1107 writebackReg = Inst.getOperand(0).getReg(); 1108 break; 1109 } 1110 1111 // Empty register lists are not allowed. 1112 if (CountPopulation_32(Val) == 0) return MCDisassembler::Fail; 1113 for (unsigned i = 0; i < 16; ++i) { 1114 if (Val & (1 << i)) { 1115 if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder))) 1116 return MCDisassembler::Fail; 1117 // Writeback not allowed if Rn is in the target list. 1118 if (writebackLoad && writebackReg == Inst.end()[-1].getReg()) 1119 Check(S, MCDisassembler::SoftFail); 1120 } 1121 } 1122 1123 return S; 1124 } 1125 1126 static DecodeStatus DecodeSPRRegListOperand(llvm::MCInst &Inst, unsigned Val, 1127 uint64_t Address, const void *Decoder) { 1128 DecodeStatus S = MCDisassembler::Success; 1129 1130 unsigned Vd = fieldFromInstruction32(Val, 8, 4); 1131 unsigned regs = Val & 0xFF; 1132 1133 if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder))) 1134 return MCDisassembler::Fail; 1135 for (unsigned i = 0; i < (regs - 1); ++i) { 1136 if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder))) 1137 return MCDisassembler::Fail; 1138 } 1139 1140 return S; 1141 } 1142 1143 static DecodeStatus DecodeDPRRegListOperand(llvm::MCInst &Inst, unsigned Val, 1144 uint64_t Address, const void *Decoder) { 1145 DecodeStatus S = MCDisassembler::Success; 1146 1147 unsigned Vd = fieldFromInstruction32(Val, 8, 4); 1148 unsigned regs = (Val & 0xFF) / 2; 1149 1150 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder))) 1151 return MCDisassembler::Fail; 1152 for (unsigned i = 0; i < (regs - 1); ++i) { 1153 if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder))) 1154 return MCDisassembler::Fail; 1155 } 1156 1157 return S; 1158 } 1159 1160 static DecodeStatus DecodeBitfieldMaskOperand(llvm::MCInst &Inst, unsigned Val, 1161 uint64_t Address, const void *Decoder) { 1162 // This operand encodes a mask of contiguous zeros between a specified MSB 1163 // and LSB. To decode it, we create the mask of all bits MSB-and-lower, 1164 // the mask of all bits LSB-and-lower, and then xor them to create 1165 // the mask of that's all ones on [msb, lsb]. Finally we not it to 1166 // create the final mask. 1167 unsigned msb = fieldFromInstruction32(Val, 5, 5); 1168 unsigned lsb = fieldFromInstruction32(Val, 0, 5); 1169 1170 DecodeStatus S = MCDisassembler::Success; 1171 if (lsb > msb) Check(S, MCDisassembler::SoftFail); 1172 1173 uint32_t msb_mask = 0xFFFFFFFF; 1174 if (msb != 31) msb_mask = (1U << (msb+1)) - 1; 1175 uint32_t lsb_mask = (1U << lsb) - 1; 1176 1177 Inst.addOperand(MCOperand::CreateImm(~(msb_mask ^ lsb_mask))); 1178 return S; 1179 } 1180 1181 static DecodeStatus DecodeCopMemInstruction(llvm::MCInst &Inst, unsigned Insn, 1182 uint64_t Address, const void *Decoder) { 1183 DecodeStatus S = MCDisassembler::Success; 1184 1185 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1186 unsigned CRd = fieldFromInstruction32(Insn, 12, 4); 1187 unsigned coproc = fieldFromInstruction32(Insn, 8, 4); 1188 unsigned imm = fieldFromInstruction32(Insn, 0, 8); 1189 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1190 unsigned U = fieldFromInstruction32(Insn, 23, 1); 1191 1192 switch (Inst.getOpcode()) { 1193 case ARM::LDC_OFFSET: 1194 case ARM::LDC_PRE: 1195 case ARM::LDC_POST: 1196 case ARM::LDC_OPTION: 1197 case ARM::LDCL_OFFSET: 1198 case ARM::LDCL_PRE: 1199 case ARM::LDCL_POST: 1200 case ARM::LDCL_OPTION: 1201 case ARM::STC_OFFSET: 1202 case ARM::STC_PRE: 1203 case ARM::STC_POST: 1204 case ARM::STC_OPTION: 1205 case ARM::STCL_OFFSET: 1206 case ARM::STCL_PRE: 1207 case ARM::STCL_POST: 1208 case ARM::STCL_OPTION: 1209 case ARM::t2LDC_OFFSET: 1210 case ARM::t2LDC_PRE: 1211 case ARM::t2LDC_POST: 1212 case ARM::t2LDC_OPTION: 1213 case ARM::t2LDCL_OFFSET: 1214 case ARM::t2LDCL_PRE: 1215 case ARM::t2LDCL_POST: 1216 case ARM::t2LDCL_OPTION: 1217 case ARM::t2STC_OFFSET: 1218 case ARM::t2STC_PRE: 1219 case ARM::t2STC_POST: 1220 case ARM::t2STC_OPTION: 1221 case ARM::t2STCL_OFFSET: 1222 case ARM::t2STCL_PRE: 1223 case ARM::t2STCL_POST: 1224 case ARM::t2STCL_OPTION: 1225 if (coproc == 0xA || coproc == 0xB) 1226 return MCDisassembler::Fail; 1227 break; 1228 default: 1229 break; 1230 } 1231 1232 Inst.addOperand(MCOperand::CreateImm(coproc)); 1233 Inst.addOperand(MCOperand::CreateImm(CRd)); 1234 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1235 return MCDisassembler::Fail; 1236 1237 switch (Inst.getOpcode()) { 1238 case ARM::t2LDC2_OFFSET: 1239 case ARM::t2LDC2L_OFFSET: 1240 case ARM::t2LDC2_PRE: 1241 case ARM::t2LDC2L_PRE: 1242 case ARM::t2STC2_OFFSET: 1243 case ARM::t2STC2L_OFFSET: 1244 case ARM::t2STC2_PRE: 1245 case ARM::t2STC2L_PRE: 1246 case ARM::LDC2_OFFSET: 1247 case ARM::LDC2L_OFFSET: 1248 case ARM::LDC2_PRE: 1249 case ARM::LDC2L_PRE: 1250 case ARM::STC2_OFFSET: 1251 case ARM::STC2L_OFFSET: 1252 case ARM::STC2_PRE: 1253 case ARM::STC2L_PRE: 1254 case ARM::t2LDC_OFFSET: 1255 case ARM::t2LDCL_OFFSET: 1256 case ARM::t2LDC_PRE: 1257 case ARM::t2LDCL_PRE: 1258 case ARM::t2STC_OFFSET: 1259 case ARM::t2STCL_OFFSET: 1260 case ARM::t2STC_PRE: 1261 case ARM::t2STCL_PRE: 1262 case ARM::LDC_OFFSET: 1263 case ARM::LDCL_OFFSET: 1264 case ARM::LDC_PRE: 1265 case ARM::LDCL_PRE: 1266 case ARM::STC_OFFSET: 1267 case ARM::STCL_OFFSET: 1268 case ARM::STC_PRE: 1269 case ARM::STCL_PRE: 1270 imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm); 1271 Inst.addOperand(MCOperand::CreateImm(imm)); 1272 break; 1273 case ARM::t2LDC2_POST: 1274 case ARM::t2LDC2L_POST: 1275 case ARM::t2STC2_POST: 1276 case ARM::t2STC2L_POST: 1277 case ARM::LDC2_POST: 1278 case ARM::LDC2L_POST: 1279 case ARM::STC2_POST: 1280 case ARM::STC2L_POST: 1281 case ARM::t2LDC_POST: 1282 case ARM::t2LDCL_POST: 1283 case ARM::t2STC_POST: 1284 case ARM::t2STCL_POST: 1285 case ARM::LDC_POST: 1286 case ARM::LDCL_POST: 1287 case ARM::STC_POST: 1288 case ARM::STCL_POST: 1289 imm |= U << 8; 1290 // fall through. 1291 default: 1292 // The 'option' variant doesn't encode 'U' in the immediate since 1293 // the immediate is unsigned [0,255]. 1294 Inst.addOperand(MCOperand::CreateImm(imm)); 1295 break; 1296 } 1297 1298 switch (Inst.getOpcode()) { 1299 case ARM::LDC_OFFSET: 1300 case ARM::LDC_PRE: 1301 case ARM::LDC_POST: 1302 case ARM::LDC_OPTION: 1303 case ARM::LDCL_OFFSET: 1304 case ARM::LDCL_PRE: 1305 case ARM::LDCL_POST: 1306 case ARM::LDCL_OPTION: 1307 case ARM::STC_OFFSET: 1308 case ARM::STC_PRE: 1309 case ARM::STC_POST: 1310 case ARM::STC_OPTION: 1311 case ARM::STCL_OFFSET: 1312 case ARM::STCL_PRE: 1313 case ARM::STCL_POST: 1314 case ARM::STCL_OPTION: 1315 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1316 return MCDisassembler::Fail; 1317 break; 1318 default: 1319 break; 1320 } 1321 1322 return S; 1323 } 1324 1325 static DecodeStatus 1326 DecodeAddrMode2IdxInstruction(llvm::MCInst &Inst, unsigned Insn, 1327 uint64_t Address, const void *Decoder) { 1328 DecodeStatus S = MCDisassembler::Success; 1329 1330 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1331 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 1332 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 1333 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 1334 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1335 unsigned reg = fieldFromInstruction32(Insn, 25, 1); 1336 unsigned P = fieldFromInstruction32(Insn, 24, 1); 1337 unsigned W = fieldFromInstruction32(Insn, 21, 1); 1338 1339 // On stores, the writeback operand precedes Rt. 1340 switch (Inst.getOpcode()) { 1341 case ARM::STR_POST_IMM: 1342 case ARM::STR_POST_REG: 1343 case ARM::STRB_POST_IMM: 1344 case ARM::STRB_POST_REG: 1345 case ARM::STRT_POST_REG: 1346 case ARM::STRT_POST_IMM: 1347 case ARM::STRBT_POST_REG: 1348 case ARM::STRBT_POST_IMM: 1349 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1350 return MCDisassembler::Fail; 1351 break; 1352 default: 1353 break; 1354 } 1355 1356 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 1357 return MCDisassembler::Fail; 1358 1359 // On loads, the writeback operand comes after Rt. 1360 switch (Inst.getOpcode()) { 1361 case ARM::LDR_POST_IMM: 1362 case ARM::LDR_POST_REG: 1363 case ARM::LDRB_POST_IMM: 1364 case ARM::LDRB_POST_REG: 1365 case ARM::LDRBT_POST_REG: 1366 case ARM::LDRBT_POST_IMM: 1367 case ARM::LDRT_POST_REG: 1368 case ARM::LDRT_POST_IMM: 1369 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1370 return MCDisassembler::Fail; 1371 break; 1372 default: 1373 break; 1374 } 1375 1376 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1377 return MCDisassembler::Fail; 1378 1379 ARM_AM::AddrOpc Op = ARM_AM::add; 1380 if (!fieldFromInstruction32(Insn, 23, 1)) 1381 Op = ARM_AM::sub; 1382 1383 bool writeback = (P == 0) || (W == 1); 1384 unsigned idx_mode = 0; 1385 if (P && writeback) 1386 idx_mode = ARMII::IndexModePre; 1387 else if (!P && writeback) 1388 idx_mode = ARMII::IndexModePost; 1389 1390 if (writeback && (Rn == 15 || Rn == Rt)) 1391 S = MCDisassembler::SoftFail; // UNPREDICTABLE 1392 1393 if (reg) { 1394 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1395 return MCDisassembler::Fail; 1396 ARM_AM::ShiftOpc Opc = ARM_AM::lsl; 1397 switch( fieldFromInstruction32(Insn, 5, 2)) { 1398 case 0: 1399 Opc = ARM_AM::lsl; 1400 break; 1401 case 1: 1402 Opc = ARM_AM::lsr; 1403 break; 1404 case 2: 1405 Opc = ARM_AM::asr; 1406 break; 1407 case 3: 1408 Opc = ARM_AM::ror; 1409 break; 1410 default: 1411 return MCDisassembler::Fail; 1412 } 1413 unsigned amt = fieldFromInstruction32(Insn, 7, 5); 1414 unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode); 1415 1416 Inst.addOperand(MCOperand::CreateImm(imm)); 1417 } else { 1418 Inst.addOperand(MCOperand::CreateReg(0)); 1419 unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode); 1420 Inst.addOperand(MCOperand::CreateImm(tmp)); 1421 } 1422 1423 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1424 return MCDisassembler::Fail; 1425 1426 return S; 1427 } 1428 1429 static DecodeStatus DecodeSORegMemOperand(llvm::MCInst &Inst, unsigned Val, 1430 uint64_t Address, const void *Decoder) { 1431 DecodeStatus S = MCDisassembler::Success; 1432 1433 unsigned Rn = fieldFromInstruction32(Val, 13, 4); 1434 unsigned Rm = fieldFromInstruction32(Val, 0, 4); 1435 unsigned type = fieldFromInstruction32(Val, 5, 2); 1436 unsigned imm = fieldFromInstruction32(Val, 7, 5); 1437 unsigned U = fieldFromInstruction32(Val, 12, 1); 1438 1439 ARM_AM::ShiftOpc ShOp = ARM_AM::lsl; 1440 switch (type) { 1441 case 0: 1442 ShOp = ARM_AM::lsl; 1443 break; 1444 case 1: 1445 ShOp = ARM_AM::lsr; 1446 break; 1447 case 2: 1448 ShOp = ARM_AM::asr; 1449 break; 1450 case 3: 1451 ShOp = ARM_AM::ror; 1452 break; 1453 } 1454 1455 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1456 return MCDisassembler::Fail; 1457 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1458 return MCDisassembler::Fail; 1459 unsigned shift; 1460 if (U) 1461 shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp); 1462 else 1463 shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp); 1464 Inst.addOperand(MCOperand::CreateImm(shift)); 1465 1466 return S; 1467 } 1468 1469 static DecodeStatus 1470 DecodeAddrMode3Instruction(llvm::MCInst &Inst, unsigned Insn, 1471 uint64_t Address, const void *Decoder) { 1472 DecodeStatus S = MCDisassembler::Success; 1473 1474 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 1475 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1476 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 1477 unsigned type = fieldFromInstruction32(Insn, 22, 1); 1478 unsigned imm = fieldFromInstruction32(Insn, 8, 4); 1479 unsigned U = ((~fieldFromInstruction32(Insn, 23, 1)) & 1) << 8; 1480 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1481 unsigned W = fieldFromInstruction32(Insn, 21, 1); 1482 unsigned P = fieldFromInstruction32(Insn, 24, 1); 1483 1484 bool writeback = (W == 1) | (P == 0); 1485 1486 // For {LD,ST}RD, Rt must be even, else undefined. 1487 switch (Inst.getOpcode()) { 1488 case ARM::STRD: 1489 case ARM::STRD_PRE: 1490 case ARM::STRD_POST: 1491 case ARM::LDRD: 1492 case ARM::LDRD_PRE: 1493 case ARM::LDRD_POST: 1494 if (Rt & 0x1) return MCDisassembler::Fail; 1495 break; 1496 default: 1497 break; 1498 } 1499 1500 if (writeback) { // Writeback 1501 if (P) 1502 U |= ARMII::IndexModePre << 9; 1503 else 1504 U |= ARMII::IndexModePost << 9; 1505 1506 // On stores, the writeback operand precedes Rt. 1507 switch (Inst.getOpcode()) { 1508 case ARM::STRD: 1509 case ARM::STRD_PRE: 1510 case ARM::STRD_POST: 1511 case ARM::STRH: 1512 case ARM::STRH_PRE: 1513 case ARM::STRH_POST: 1514 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1515 return MCDisassembler::Fail; 1516 break; 1517 default: 1518 break; 1519 } 1520 } 1521 1522 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 1523 return MCDisassembler::Fail; 1524 switch (Inst.getOpcode()) { 1525 case ARM::STRD: 1526 case ARM::STRD_PRE: 1527 case ARM::STRD_POST: 1528 case ARM::LDRD: 1529 case ARM::LDRD_PRE: 1530 case ARM::LDRD_POST: 1531 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 1532 return MCDisassembler::Fail; 1533 break; 1534 default: 1535 break; 1536 } 1537 1538 if (writeback) { 1539 // On loads, the writeback operand comes after Rt. 1540 switch (Inst.getOpcode()) { 1541 case ARM::LDRD: 1542 case ARM::LDRD_PRE: 1543 case ARM::LDRD_POST: 1544 case ARM::LDRH: 1545 case ARM::LDRH_PRE: 1546 case ARM::LDRH_POST: 1547 case ARM::LDRSH: 1548 case ARM::LDRSH_PRE: 1549 case ARM::LDRSH_POST: 1550 case ARM::LDRSB: 1551 case ARM::LDRSB_PRE: 1552 case ARM::LDRSB_POST: 1553 case ARM::LDRHTr: 1554 case ARM::LDRSBTr: 1555 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1556 return MCDisassembler::Fail; 1557 break; 1558 default: 1559 break; 1560 } 1561 } 1562 1563 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1564 return MCDisassembler::Fail; 1565 1566 if (type) { 1567 Inst.addOperand(MCOperand::CreateReg(0)); 1568 Inst.addOperand(MCOperand::CreateImm(U | (imm << 4) | Rm)); 1569 } else { 1570 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1571 return MCDisassembler::Fail; 1572 Inst.addOperand(MCOperand::CreateImm(U)); 1573 } 1574 1575 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1576 return MCDisassembler::Fail; 1577 1578 return S; 1579 } 1580 1581 static DecodeStatus DecodeRFEInstruction(llvm::MCInst &Inst, unsigned Insn, 1582 uint64_t Address, const void *Decoder) { 1583 DecodeStatus S = MCDisassembler::Success; 1584 1585 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1586 unsigned mode = fieldFromInstruction32(Insn, 23, 2); 1587 1588 switch (mode) { 1589 case 0: 1590 mode = ARM_AM::da; 1591 break; 1592 case 1: 1593 mode = ARM_AM::ia; 1594 break; 1595 case 2: 1596 mode = ARM_AM::db; 1597 break; 1598 case 3: 1599 mode = ARM_AM::ib; 1600 break; 1601 } 1602 1603 Inst.addOperand(MCOperand::CreateImm(mode)); 1604 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1605 return MCDisassembler::Fail; 1606 1607 return S; 1608 } 1609 1610 static DecodeStatus DecodeMemMultipleWritebackInstruction(llvm::MCInst &Inst, 1611 unsigned Insn, 1612 uint64_t Address, const void *Decoder) { 1613 DecodeStatus S = MCDisassembler::Success; 1614 1615 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1616 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1617 unsigned reglist = fieldFromInstruction32(Insn, 0, 16); 1618 1619 if (pred == 0xF) { 1620 switch (Inst.getOpcode()) { 1621 case ARM::LDMDA: 1622 Inst.setOpcode(ARM::RFEDA); 1623 break; 1624 case ARM::LDMDA_UPD: 1625 Inst.setOpcode(ARM::RFEDA_UPD); 1626 break; 1627 case ARM::LDMDB: 1628 Inst.setOpcode(ARM::RFEDB); 1629 break; 1630 case ARM::LDMDB_UPD: 1631 Inst.setOpcode(ARM::RFEDB_UPD); 1632 break; 1633 case ARM::LDMIA: 1634 Inst.setOpcode(ARM::RFEIA); 1635 break; 1636 case ARM::LDMIA_UPD: 1637 Inst.setOpcode(ARM::RFEIA_UPD); 1638 break; 1639 case ARM::LDMIB: 1640 Inst.setOpcode(ARM::RFEIB); 1641 break; 1642 case ARM::LDMIB_UPD: 1643 Inst.setOpcode(ARM::RFEIB_UPD); 1644 break; 1645 case ARM::STMDA: 1646 Inst.setOpcode(ARM::SRSDA); 1647 break; 1648 case ARM::STMDA_UPD: 1649 Inst.setOpcode(ARM::SRSDA_UPD); 1650 break; 1651 case ARM::STMDB: 1652 Inst.setOpcode(ARM::SRSDB); 1653 break; 1654 case ARM::STMDB_UPD: 1655 Inst.setOpcode(ARM::SRSDB_UPD); 1656 break; 1657 case ARM::STMIA: 1658 Inst.setOpcode(ARM::SRSIA); 1659 break; 1660 case ARM::STMIA_UPD: 1661 Inst.setOpcode(ARM::SRSIA_UPD); 1662 break; 1663 case ARM::STMIB: 1664 Inst.setOpcode(ARM::SRSIB); 1665 break; 1666 case ARM::STMIB_UPD: 1667 Inst.setOpcode(ARM::SRSIB_UPD); 1668 break; 1669 default: 1670 if (!Check(S, MCDisassembler::Fail)) return MCDisassembler::Fail; 1671 } 1672 1673 // For stores (which become SRS's, the only operand is the mode. 1674 if (fieldFromInstruction32(Insn, 20, 1) == 0) { 1675 Inst.addOperand( 1676 MCOperand::CreateImm(fieldFromInstruction32(Insn, 0, 4))); 1677 return S; 1678 } 1679 1680 return DecodeRFEInstruction(Inst, Insn, Address, Decoder); 1681 } 1682 1683 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1684 return MCDisassembler::Fail; 1685 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1686 return MCDisassembler::Fail; // Tied 1687 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1688 return MCDisassembler::Fail; 1689 if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder))) 1690 return MCDisassembler::Fail; 1691 1692 return S; 1693 } 1694 1695 static DecodeStatus DecodeCPSInstruction(llvm::MCInst &Inst, unsigned Insn, 1696 uint64_t Address, const void *Decoder) { 1697 unsigned imod = fieldFromInstruction32(Insn, 18, 2); 1698 unsigned M = fieldFromInstruction32(Insn, 17, 1); 1699 unsigned iflags = fieldFromInstruction32(Insn, 6, 3); 1700 unsigned mode = fieldFromInstruction32(Insn, 0, 5); 1701 1702 DecodeStatus S = MCDisassembler::Success; 1703 1704 // imod == '01' --> UNPREDICTABLE 1705 // NOTE: Even though this is technically UNPREDICTABLE, we choose to 1706 // return failure here. The '01' imod value is unprintable, so there's 1707 // nothing useful we could do even if we returned UNPREDICTABLE. 1708 1709 if (imod == 1) return MCDisassembler::Fail; 1710 1711 if (imod && M) { 1712 Inst.setOpcode(ARM::CPS3p); 1713 Inst.addOperand(MCOperand::CreateImm(imod)); 1714 Inst.addOperand(MCOperand::CreateImm(iflags)); 1715 Inst.addOperand(MCOperand::CreateImm(mode)); 1716 } else if (imod && !M) { 1717 Inst.setOpcode(ARM::CPS2p); 1718 Inst.addOperand(MCOperand::CreateImm(imod)); 1719 Inst.addOperand(MCOperand::CreateImm(iflags)); 1720 if (mode) S = MCDisassembler::SoftFail; 1721 } else if (!imod && M) { 1722 Inst.setOpcode(ARM::CPS1p); 1723 Inst.addOperand(MCOperand::CreateImm(mode)); 1724 if (iflags) S = MCDisassembler::SoftFail; 1725 } else { 1726 // imod == '00' && M == '0' --> UNPREDICTABLE 1727 Inst.setOpcode(ARM::CPS1p); 1728 Inst.addOperand(MCOperand::CreateImm(mode)); 1729 S = MCDisassembler::SoftFail; 1730 } 1731 1732 return S; 1733 } 1734 1735 static DecodeStatus DecodeT2CPSInstruction(llvm::MCInst &Inst, unsigned Insn, 1736 uint64_t Address, const void *Decoder) { 1737 unsigned imod = fieldFromInstruction32(Insn, 9, 2); 1738 unsigned M = fieldFromInstruction32(Insn, 8, 1); 1739 unsigned iflags = fieldFromInstruction32(Insn, 5, 3); 1740 unsigned mode = fieldFromInstruction32(Insn, 0, 5); 1741 1742 DecodeStatus S = MCDisassembler::Success; 1743 1744 // imod == '01' --> UNPREDICTABLE 1745 // NOTE: Even though this is technically UNPREDICTABLE, we choose to 1746 // return failure here. The '01' imod value is unprintable, so there's 1747 // nothing useful we could do even if we returned UNPREDICTABLE. 1748 1749 if (imod == 1) return MCDisassembler::Fail; 1750 1751 if (imod && M) { 1752 Inst.setOpcode(ARM::t2CPS3p); 1753 Inst.addOperand(MCOperand::CreateImm(imod)); 1754 Inst.addOperand(MCOperand::CreateImm(iflags)); 1755 Inst.addOperand(MCOperand::CreateImm(mode)); 1756 } else if (imod && !M) { 1757 Inst.setOpcode(ARM::t2CPS2p); 1758 Inst.addOperand(MCOperand::CreateImm(imod)); 1759 Inst.addOperand(MCOperand::CreateImm(iflags)); 1760 if (mode) S = MCDisassembler::SoftFail; 1761 } else if (!imod && M) { 1762 Inst.setOpcode(ARM::t2CPS1p); 1763 Inst.addOperand(MCOperand::CreateImm(mode)); 1764 if (iflags) S = MCDisassembler::SoftFail; 1765 } else { 1766 // imod == '00' && M == '0' --> UNPREDICTABLE 1767 Inst.setOpcode(ARM::t2CPS1p); 1768 Inst.addOperand(MCOperand::CreateImm(mode)); 1769 S = MCDisassembler::SoftFail; 1770 } 1771 1772 return S; 1773 } 1774 1775 static DecodeStatus DecodeT2MOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, 1776 uint64_t Address, const void *Decoder) { 1777 DecodeStatus S = MCDisassembler::Success; 1778 1779 unsigned Rd = fieldFromInstruction32(Insn, 8, 4); 1780 unsigned imm = 0; 1781 1782 imm |= (fieldFromInstruction32(Insn, 0, 8) << 0); 1783 imm |= (fieldFromInstruction32(Insn, 12, 3) << 8); 1784 imm |= (fieldFromInstruction32(Insn, 16, 4) << 12); 1785 imm |= (fieldFromInstruction32(Insn, 26, 1) << 11); 1786 1787 if (Inst.getOpcode() == ARM::t2MOVTi16) 1788 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1789 return MCDisassembler::Fail; 1790 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1791 return MCDisassembler::Fail; 1792 1793 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) 1794 Inst.addOperand(MCOperand::CreateImm(imm)); 1795 1796 return S; 1797 } 1798 1799 static DecodeStatus DecodeArmMOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, 1800 uint64_t Address, const void *Decoder) { 1801 DecodeStatus S = MCDisassembler::Success; 1802 1803 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 1804 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1805 unsigned imm = 0; 1806 1807 imm |= (fieldFromInstruction32(Insn, 0, 12) << 0); 1808 imm |= (fieldFromInstruction32(Insn, 16, 4) << 12); 1809 1810 if (Inst.getOpcode() == ARM::MOVTi16) 1811 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1812 return MCDisassembler::Fail; 1813 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1814 return MCDisassembler::Fail; 1815 1816 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) 1817 Inst.addOperand(MCOperand::CreateImm(imm)); 1818 1819 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1820 return MCDisassembler::Fail; 1821 1822 return S; 1823 } 1824 1825 static DecodeStatus DecodeSMLAInstruction(llvm::MCInst &Inst, unsigned Insn, 1826 uint64_t Address, const void *Decoder) { 1827 DecodeStatus S = MCDisassembler::Success; 1828 1829 unsigned Rd = fieldFromInstruction32(Insn, 16, 4); 1830 unsigned Rn = fieldFromInstruction32(Insn, 0, 4); 1831 unsigned Rm = fieldFromInstruction32(Insn, 8, 4); 1832 unsigned Ra = fieldFromInstruction32(Insn, 12, 4); 1833 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1834 1835 if (pred == 0xF) 1836 return DecodeCPSInstruction(Inst, Insn, Address, Decoder); 1837 1838 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) 1839 return MCDisassembler::Fail; 1840 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 1841 return MCDisassembler::Fail; 1842 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1843 return MCDisassembler::Fail; 1844 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder))) 1845 return MCDisassembler::Fail; 1846 1847 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1848 return MCDisassembler::Fail; 1849 1850 return S; 1851 } 1852 1853 static DecodeStatus DecodeAddrModeImm12Operand(llvm::MCInst &Inst, unsigned Val, 1854 uint64_t Address, const void *Decoder) { 1855 DecodeStatus S = MCDisassembler::Success; 1856 1857 unsigned add = fieldFromInstruction32(Val, 12, 1); 1858 unsigned imm = fieldFromInstruction32(Val, 0, 12); 1859 unsigned Rn = fieldFromInstruction32(Val, 13, 4); 1860 1861 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1862 return MCDisassembler::Fail; 1863 1864 if (!add) imm *= -1; 1865 if (imm == 0 && !add) imm = INT32_MIN; 1866 Inst.addOperand(MCOperand::CreateImm(imm)); 1867 if (Rn == 15) 1868 tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder); 1869 1870 return S; 1871 } 1872 1873 static DecodeStatus DecodeAddrMode5Operand(llvm::MCInst &Inst, unsigned Val, 1874 uint64_t Address, const void *Decoder) { 1875 DecodeStatus S = MCDisassembler::Success; 1876 1877 unsigned Rn = fieldFromInstruction32(Val, 9, 4); 1878 unsigned U = fieldFromInstruction32(Val, 8, 1); 1879 unsigned imm = fieldFromInstruction32(Val, 0, 8); 1880 1881 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1882 return MCDisassembler::Fail; 1883 1884 if (U) 1885 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add, imm))); 1886 else 1887 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm))); 1888 1889 return S; 1890 } 1891 1892 static DecodeStatus DecodeAddrMode7Operand(llvm::MCInst &Inst, unsigned Val, 1893 uint64_t Address, const void *Decoder) { 1894 return DecodeGPRRegisterClass(Inst, Val, Address, Decoder); 1895 } 1896 1897 static DecodeStatus 1898 DecodeBranchImmInstruction(llvm::MCInst &Inst, unsigned Insn, 1899 uint64_t Address, const void *Decoder) { 1900 DecodeStatus S = MCDisassembler::Success; 1901 1902 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1903 unsigned imm = fieldFromInstruction32(Insn, 0, 24) << 2; 1904 1905 if (pred == 0xF) { 1906 Inst.setOpcode(ARM::BLXi); 1907 imm |= fieldFromInstruction32(Insn, 24, 1) << 1; 1908 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm))); 1909 return S; 1910 } 1911 1912 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8, true, 1913 4, Inst, Decoder)) 1914 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm))); 1915 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1916 return MCDisassembler::Fail; 1917 1918 return S; 1919 } 1920 1921 1922 static DecodeStatus DecodeVCVTImmOperand(llvm::MCInst &Inst, unsigned Val, 1923 uint64_t Address, const void *Decoder) { 1924 Inst.addOperand(MCOperand::CreateImm(64 - Val)); 1925 return MCDisassembler::Success; 1926 } 1927 1928 static DecodeStatus DecodeAddrMode6Operand(llvm::MCInst &Inst, unsigned Val, 1929 uint64_t Address, const void *Decoder) { 1930 DecodeStatus S = MCDisassembler::Success; 1931 1932 unsigned Rm = fieldFromInstruction32(Val, 0, 4); 1933 unsigned align = fieldFromInstruction32(Val, 4, 2); 1934 1935 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1936 return MCDisassembler::Fail; 1937 if (!align) 1938 Inst.addOperand(MCOperand::CreateImm(0)); 1939 else 1940 Inst.addOperand(MCOperand::CreateImm(4 << align)); 1941 1942 return S; 1943 } 1944 1945 static DecodeStatus DecodeVLDInstruction(llvm::MCInst &Inst, unsigned Insn, 1946 uint64_t Address, const void *Decoder) { 1947 DecodeStatus S = MCDisassembler::Success; 1948 1949 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 1950 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 1951 unsigned wb = fieldFromInstruction32(Insn, 16, 4); 1952 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1953 Rn |= fieldFromInstruction32(Insn, 4, 2) << 4; 1954 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 1955 1956 // First output register 1957 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 1958 return MCDisassembler::Fail; 1959 1960 // Second output register 1961 switch (Inst.getOpcode()) { 1962 case ARM::VLD3d8: 1963 case ARM::VLD3d16: 1964 case ARM::VLD3d32: 1965 case ARM::VLD3d8_UPD: 1966 case ARM::VLD3d16_UPD: 1967 case ARM::VLD3d32_UPD: 1968 case ARM::VLD4d8: 1969 case ARM::VLD4d16: 1970 case ARM::VLD4d32: 1971 case ARM::VLD4d8_UPD: 1972 case ARM::VLD4d16_UPD: 1973 case ARM::VLD4d32_UPD: 1974 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 1975 return MCDisassembler::Fail; 1976 break; 1977 case ARM::VLD3q8: 1978 case ARM::VLD3q16: 1979 case ARM::VLD3q32: 1980 case ARM::VLD3q8_UPD: 1981 case ARM::VLD3q16_UPD: 1982 case ARM::VLD3q32_UPD: 1983 case ARM::VLD4q8: 1984 case ARM::VLD4q16: 1985 case ARM::VLD4q32: 1986 case ARM::VLD4q8_UPD: 1987 case ARM::VLD4q16_UPD: 1988 case ARM::VLD4q32_UPD: 1989 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 1990 return MCDisassembler::Fail; 1991 default: 1992 break; 1993 } 1994 1995 // Third output register 1996 switch(Inst.getOpcode()) { 1997 case ARM::VLD3d8: 1998 case ARM::VLD3d16: 1999 case ARM::VLD3d32: 2000 case ARM::VLD3d8_UPD: 2001 case ARM::VLD3d16_UPD: 2002 case ARM::VLD3d32_UPD: 2003 case ARM::VLD4d8: 2004 case ARM::VLD4d16: 2005 case ARM::VLD4d32: 2006 case ARM::VLD4d8_UPD: 2007 case ARM::VLD4d16_UPD: 2008 case ARM::VLD4d32_UPD: 2009 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2010 return MCDisassembler::Fail; 2011 break; 2012 case ARM::VLD3q8: 2013 case ARM::VLD3q16: 2014 case ARM::VLD3q32: 2015 case ARM::VLD3q8_UPD: 2016 case ARM::VLD3q16_UPD: 2017 case ARM::VLD3q32_UPD: 2018 case ARM::VLD4q8: 2019 case ARM::VLD4q16: 2020 case ARM::VLD4q32: 2021 case ARM::VLD4q8_UPD: 2022 case ARM::VLD4q16_UPD: 2023 case ARM::VLD4q32_UPD: 2024 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) 2025 return MCDisassembler::Fail; 2026 break; 2027 default: 2028 break; 2029 } 2030 2031 // Fourth output register 2032 switch (Inst.getOpcode()) { 2033 case ARM::VLD4d8: 2034 case ARM::VLD4d16: 2035 case ARM::VLD4d32: 2036 case ARM::VLD4d8_UPD: 2037 case ARM::VLD4d16_UPD: 2038 case ARM::VLD4d32_UPD: 2039 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) 2040 return MCDisassembler::Fail; 2041 break; 2042 case ARM::VLD4q8: 2043 case ARM::VLD4q16: 2044 case ARM::VLD4q32: 2045 case ARM::VLD4q8_UPD: 2046 case ARM::VLD4q16_UPD: 2047 case ARM::VLD4q32_UPD: 2048 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) 2049 return MCDisassembler::Fail; 2050 break; 2051 default: 2052 break; 2053 } 2054 2055 // Writeback operand 2056 switch (Inst.getOpcode()) { 2057 case ARM::VLD1d8wb_fixed: 2058 case ARM::VLD1d16wb_fixed: 2059 case ARM::VLD1d32wb_fixed: 2060 case ARM::VLD1d64wb_fixed: 2061 case ARM::VLD1d8wb_register: 2062 case ARM::VLD1d16wb_register: 2063 case ARM::VLD1d32wb_register: 2064 case ARM::VLD1d64wb_register: 2065 case ARM::VLD1q8wb_fixed: 2066 case ARM::VLD1q16wb_fixed: 2067 case ARM::VLD1q32wb_fixed: 2068 case ARM::VLD1q64wb_fixed: 2069 case ARM::VLD1q8wb_register: 2070 case ARM::VLD1q16wb_register: 2071 case ARM::VLD1q32wb_register: 2072 case ARM::VLD1q64wb_register: 2073 case ARM::VLD1d8T_UPD: 2074 case ARM::VLD1d16T_UPD: 2075 case ARM::VLD1d32T_UPD: 2076 case ARM::VLD1d64T_UPD: 2077 case ARM::VLD1d8Q_UPD: 2078 case ARM::VLD1d16Q_UPD: 2079 case ARM::VLD1d32Q_UPD: 2080 case ARM::VLD1d64Q_UPD: 2081 case ARM::VLD2d8_UPD: 2082 case ARM::VLD2d16_UPD: 2083 case ARM::VLD2d32_UPD: 2084 case ARM::VLD2q8_UPD: 2085 case ARM::VLD2q16_UPD: 2086 case ARM::VLD2q32_UPD: 2087 case ARM::VLD2b8_UPD: 2088 case ARM::VLD2b16_UPD: 2089 case ARM::VLD2b32_UPD: 2090 case ARM::VLD3d8_UPD: 2091 case ARM::VLD3d16_UPD: 2092 case ARM::VLD3d32_UPD: 2093 case ARM::VLD3q8_UPD: 2094 case ARM::VLD3q16_UPD: 2095 case ARM::VLD3q32_UPD: 2096 case ARM::VLD4d8_UPD: 2097 case ARM::VLD4d16_UPD: 2098 case ARM::VLD4d32_UPD: 2099 case ARM::VLD4q8_UPD: 2100 case ARM::VLD4q16_UPD: 2101 case ARM::VLD4q32_UPD: 2102 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) 2103 return MCDisassembler::Fail; 2104 break; 2105 default: 2106 break; 2107 } 2108 2109 // AddrMode6 Base (register+alignment) 2110 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) 2111 return MCDisassembler::Fail; 2112 2113 // AddrMode6 Offset (register) 2114 switch (Inst.getOpcode()) { 2115 default: 2116 // The below have been updated to have explicit am6offset split 2117 // between fixed and register offset. For those instructions not 2118 // yet updated, we need to add an additional reg0 operand for the 2119 // fixed variant. 2120 // 2121 // The fixed offset encodes as Rm == 0xd, so we check for that. 2122 if (Rm == 0xd) { 2123 Inst.addOperand(MCOperand::CreateReg(0)); 2124 break; 2125 } 2126 // Fall through to handle the register offset variant. 2127 case ARM::VLD1d8wb_fixed: 2128 case ARM::VLD1d16wb_fixed: 2129 case ARM::VLD1d32wb_fixed: 2130 case ARM::VLD1d64wb_fixed: 2131 case ARM::VLD1d8wb_register: 2132 case ARM::VLD1d16wb_register: 2133 case ARM::VLD1d32wb_register: 2134 case ARM::VLD1d64wb_register: 2135 case ARM::VLD1q8wb_fixed: 2136 case ARM::VLD1q16wb_fixed: 2137 case ARM::VLD1q32wb_fixed: 2138 case ARM::VLD1q64wb_fixed: 2139 case ARM::VLD1q8wb_register: 2140 case ARM::VLD1q16wb_register: 2141 case ARM::VLD1q32wb_register: 2142 case ARM::VLD1q64wb_register: 2143 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback 2144 // variant encodes Rm == 0xf. Anything else is a register offset post- 2145 // increment and we need to add the register operand to the instruction. 2146 if (Rm != 0xD && Rm != 0xF && 2147 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2148 return MCDisassembler::Fail; 2149 break; 2150 } 2151 2152 return S; 2153 } 2154 2155 static DecodeStatus DecodeVSTInstruction(llvm::MCInst &Inst, unsigned Insn, 2156 uint64_t Address, const void *Decoder) { 2157 DecodeStatus S = MCDisassembler::Success; 2158 2159 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2160 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2161 unsigned wb = fieldFromInstruction32(Insn, 16, 4); 2162 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2163 Rn |= fieldFromInstruction32(Insn, 4, 2) << 4; 2164 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2165 2166 // Writeback Operand 2167 switch (Inst.getOpcode()) { 2168 case ARM::VST1d8_UPD: 2169 case ARM::VST1d16_UPD: 2170 case ARM::VST1d32_UPD: 2171 case ARM::VST1d64_UPD: 2172 case ARM::VST1q8_UPD: 2173 case ARM::VST1q16_UPD: 2174 case ARM::VST1q32_UPD: 2175 case ARM::VST1q64_UPD: 2176 case ARM::VST1d8T_UPD: 2177 case ARM::VST1d16T_UPD: 2178 case ARM::VST1d32T_UPD: 2179 case ARM::VST1d64T_UPD: 2180 case ARM::VST1d8Q_UPD: 2181 case ARM::VST1d16Q_UPD: 2182 case ARM::VST1d32Q_UPD: 2183 case ARM::VST1d64Q_UPD: 2184 case ARM::VST2d8_UPD: 2185 case ARM::VST2d16_UPD: 2186 case ARM::VST2d32_UPD: 2187 case ARM::VST2q8_UPD: 2188 case ARM::VST2q16_UPD: 2189 case ARM::VST2q32_UPD: 2190 case ARM::VST2b8_UPD: 2191 case ARM::VST2b16_UPD: 2192 case ARM::VST2b32_UPD: 2193 case ARM::VST3d8_UPD: 2194 case ARM::VST3d16_UPD: 2195 case ARM::VST3d32_UPD: 2196 case ARM::VST3q8_UPD: 2197 case ARM::VST3q16_UPD: 2198 case ARM::VST3q32_UPD: 2199 case ARM::VST4d8_UPD: 2200 case ARM::VST4d16_UPD: 2201 case ARM::VST4d32_UPD: 2202 case ARM::VST4q8_UPD: 2203 case ARM::VST4q16_UPD: 2204 case ARM::VST4q32_UPD: 2205 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) 2206 return MCDisassembler::Fail; 2207 break; 2208 default: 2209 break; 2210 } 2211 2212 // AddrMode6 Base (register+alignment) 2213 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) 2214 return MCDisassembler::Fail; 2215 2216 // AddrMode6 Offset (register) 2217 if (Rm == 0xD) 2218 Inst.addOperand(MCOperand::CreateReg(0)); 2219 else if (Rm != 0xF) { 2220 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2221 return MCDisassembler::Fail; 2222 } 2223 2224 // First input register 2225 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2226 return MCDisassembler::Fail; 2227 2228 // Second input register 2229 switch (Inst.getOpcode()) { 2230 case ARM::VST1q8: 2231 case ARM::VST1q16: 2232 case ARM::VST1q32: 2233 case ARM::VST1q64: 2234 case ARM::VST1q8_UPD: 2235 case ARM::VST1q16_UPD: 2236 case ARM::VST1q32_UPD: 2237 case ARM::VST1q64_UPD: 2238 case ARM::VST1d8T: 2239 case ARM::VST1d16T: 2240 case ARM::VST1d32T: 2241 case ARM::VST1d64T: 2242 case ARM::VST1d8T_UPD: 2243 case ARM::VST1d16T_UPD: 2244 case ARM::VST1d32T_UPD: 2245 case ARM::VST1d64T_UPD: 2246 case ARM::VST1d8Q: 2247 case ARM::VST1d16Q: 2248 case ARM::VST1d32Q: 2249 case ARM::VST1d64Q: 2250 case ARM::VST1d8Q_UPD: 2251 case ARM::VST1d16Q_UPD: 2252 case ARM::VST1d32Q_UPD: 2253 case ARM::VST1d64Q_UPD: 2254 case ARM::VST2d8: 2255 case ARM::VST2d16: 2256 case ARM::VST2d32: 2257 case ARM::VST2d8_UPD: 2258 case ARM::VST2d16_UPD: 2259 case ARM::VST2d32_UPD: 2260 case ARM::VST2q8: 2261 case ARM::VST2q16: 2262 case ARM::VST2q32: 2263 case ARM::VST2q8_UPD: 2264 case ARM::VST2q16_UPD: 2265 case ARM::VST2q32_UPD: 2266 case ARM::VST3d8: 2267 case ARM::VST3d16: 2268 case ARM::VST3d32: 2269 case ARM::VST3d8_UPD: 2270 case ARM::VST3d16_UPD: 2271 case ARM::VST3d32_UPD: 2272 case ARM::VST4d8: 2273 case ARM::VST4d16: 2274 case ARM::VST4d32: 2275 case ARM::VST4d8_UPD: 2276 case ARM::VST4d16_UPD: 2277 case ARM::VST4d32_UPD: 2278 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 2279 return MCDisassembler::Fail; 2280 break; 2281 case ARM::VST2b8: 2282 case ARM::VST2b16: 2283 case ARM::VST2b32: 2284 case ARM::VST2b8_UPD: 2285 case ARM::VST2b16_UPD: 2286 case ARM::VST2b32_UPD: 2287 case ARM::VST3q8: 2288 case ARM::VST3q16: 2289 case ARM::VST3q32: 2290 case ARM::VST3q8_UPD: 2291 case ARM::VST3q16_UPD: 2292 case ARM::VST3q32_UPD: 2293 case ARM::VST4q8: 2294 case ARM::VST4q16: 2295 case ARM::VST4q32: 2296 case ARM::VST4q8_UPD: 2297 case ARM::VST4q16_UPD: 2298 case ARM::VST4q32_UPD: 2299 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2300 return MCDisassembler::Fail; 2301 break; 2302 default: 2303 break; 2304 } 2305 2306 // Third input register 2307 switch (Inst.getOpcode()) { 2308 case ARM::VST1d8T: 2309 case ARM::VST1d16T: 2310 case ARM::VST1d32T: 2311 case ARM::VST1d64T: 2312 case ARM::VST1d8T_UPD: 2313 case ARM::VST1d16T_UPD: 2314 case ARM::VST1d32T_UPD: 2315 case ARM::VST1d64T_UPD: 2316 case ARM::VST1d8Q: 2317 case ARM::VST1d16Q: 2318 case ARM::VST1d32Q: 2319 case ARM::VST1d64Q: 2320 case ARM::VST1d8Q_UPD: 2321 case ARM::VST1d16Q_UPD: 2322 case ARM::VST1d32Q_UPD: 2323 case ARM::VST1d64Q_UPD: 2324 case ARM::VST2q8: 2325 case ARM::VST2q16: 2326 case ARM::VST2q32: 2327 case ARM::VST2q8_UPD: 2328 case ARM::VST2q16_UPD: 2329 case ARM::VST2q32_UPD: 2330 case ARM::VST3d8: 2331 case ARM::VST3d16: 2332 case ARM::VST3d32: 2333 case ARM::VST3d8_UPD: 2334 case ARM::VST3d16_UPD: 2335 case ARM::VST3d32_UPD: 2336 case ARM::VST4d8: 2337 case ARM::VST4d16: 2338 case ARM::VST4d32: 2339 case ARM::VST4d8_UPD: 2340 case ARM::VST4d16_UPD: 2341 case ARM::VST4d32_UPD: 2342 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2343 return MCDisassembler::Fail; 2344 break; 2345 case ARM::VST3q8: 2346 case ARM::VST3q16: 2347 case ARM::VST3q32: 2348 case ARM::VST3q8_UPD: 2349 case ARM::VST3q16_UPD: 2350 case ARM::VST3q32_UPD: 2351 case ARM::VST4q8: 2352 case ARM::VST4q16: 2353 case ARM::VST4q32: 2354 case ARM::VST4q8_UPD: 2355 case ARM::VST4q16_UPD: 2356 case ARM::VST4q32_UPD: 2357 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) 2358 return MCDisassembler::Fail; 2359 break; 2360 default: 2361 break; 2362 } 2363 2364 // Fourth input register 2365 switch (Inst.getOpcode()) { 2366 case ARM::VST1d8Q: 2367 case ARM::VST1d16Q: 2368 case ARM::VST1d32Q: 2369 case ARM::VST1d64Q: 2370 case ARM::VST1d8Q_UPD: 2371 case ARM::VST1d16Q_UPD: 2372 case ARM::VST1d32Q_UPD: 2373 case ARM::VST1d64Q_UPD: 2374 case ARM::VST2q8: 2375 case ARM::VST2q16: 2376 case ARM::VST2q32: 2377 case ARM::VST2q8_UPD: 2378 case ARM::VST2q16_UPD: 2379 case ARM::VST2q32_UPD: 2380 case ARM::VST4d8: 2381 case ARM::VST4d16: 2382 case ARM::VST4d32: 2383 case ARM::VST4d8_UPD: 2384 case ARM::VST4d16_UPD: 2385 case ARM::VST4d32_UPD: 2386 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) 2387 return MCDisassembler::Fail; 2388 break; 2389 case ARM::VST4q8: 2390 case ARM::VST4q16: 2391 case ARM::VST4q32: 2392 case ARM::VST4q8_UPD: 2393 case ARM::VST4q16_UPD: 2394 case ARM::VST4q32_UPD: 2395 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) 2396 return MCDisassembler::Fail; 2397 break; 2398 default: 2399 break; 2400 } 2401 2402 return S; 2403 } 2404 2405 static DecodeStatus DecodeVLD1DupInstruction(llvm::MCInst &Inst, unsigned Insn, 2406 uint64_t Address, const void *Decoder) { 2407 DecodeStatus S = MCDisassembler::Success; 2408 2409 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2410 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2411 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2412 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2413 unsigned align = fieldFromInstruction32(Insn, 4, 1); 2414 unsigned size = fieldFromInstruction32(Insn, 6, 2); 2415 unsigned regs = fieldFromInstruction32(Insn, 5, 1) + 1; 2416 2417 align *= (1 << size); 2418 2419 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2420 return MCDisassembler::Fail; 2421 if (regs == 2) { 2422 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 2423 return MCDisassembler::Fail; 2424 } 2425 if (Rm != 0xF) { 2426 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2427 return MCDisassembler::Fail; 2428 } 2429 2430 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2431 return MCDisassembler::Fail; 2432 Inst.addOperand(MCOperand::CreateImm(align)); 2433 2434 if (Rm == 0xD) 2435 Inst.addOperand(MCOperand::CreateReg(0)); 2436 else if (Rm != 0xF) { 2437 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2438 return MCDisassembler::Fail; 2439 } 2440 2441 return S; 2442 } 2443 2444 static DecodeStatus DecodeVLD2DupInstruction(llvm::MCInst &Inst, unsigned Insn, 2445 uint64_t Address, const void *Decoder) { 2446 DecodeStatus S = MCDisassembler::Success; 2447 2448 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2449 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2450 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2451 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2452 unsigned align = fieldFromInstruction32(Insn, 4, 1); 2453 unsigned size = 1 << fieldFromInstruction32(Insn, 6, 2); 2454 unsigned inc = fieldFromInstruction32(Insn, 5, 1) + 1; 2455 align *= 2*size; 2456 2457 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2458 return MCDisassembler::Fail; 2459 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 2460 return MCDisassembler::Fail; 2461 if (Rm != 0xF) { 2462 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2463 return MCDisassembler::Fail; 2464 } 2465 2466 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2467 return MCDisassembler::Fail; 2468 Inst.addOperand(MCOperand::CreateImm(align)); 2469 2470 if (Rm == 0xD) 2471 Inst.addOperand(MCOperand::CreateReg(0)); 2472 else if (Rm != 0xF) { 2473 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2474 return MCDisassembler::Fail; 2475 } 2476 2477 return S; 2478 } 2479 2480 static DecodeStatus DecodeVLD3DupInstruction(llvm::MCInst &Inst, unsigned Insn, 2481 uint64_t Address, const void *Decoder) { 2482 DecodeStatus S = MCDisassembler::Success; 2483 2484 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2485 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2486 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2487 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2488 unsigned inc = fieldFromInstruction32(Insn, 5, 1) + 1; 2489 2490 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2491 return MCDisassembler::Fail; 2492 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 2493 return MCDisassembler::Fail; 2494 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) 2495 return MCDisassembler::Fail; 2496 if (Rm != 0xF) { 2497 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2498 return MCDisassembler::Fail; 2499 } 2500 2501 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2502 return MCDisassembler::Fail; 2503 Inst.addOperand(MCOperand::CreateImm(0)); 2504 2505 if (Rm == 0xD) 2506 Inst.addOperand(MCOperand::CreateReg(0)); 2507 else if (Rm != 0xF) { 2508 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2509 return MCDisassembler::Fail; 2510 } 2511 2512 return S; 2513 } 2514 2515 static DecodeStatus DecodeVLD4DupInstruction(llvm::MCInst &Inst, unsigned Insn, 2516 uint64_t Address, const void *Decoder) { 2517 DecodeStatus S = MCDisassembler::Success; 2518 2519 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2520 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2521 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2522 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2523 unsigned size = fieldFromInstruction32(Insn, 6, 2); 2524 unsigned inc = fieldFromInstruction32(Insn, 5, 1) + 1; 2525 unsigned align = fieldFromInstruction32(Insn, 4, 1); 2526 2527 if (size == 0x3) { 2528 size = 4; 2529 align = 16; 2530 } else { 2531 if (size == 2) { 2532 size = 1 << size; 2533 align *= 8; 2534 } else { 2535 size = 1 << size; 2536 align *= 4*size; 2537 } 2538 } 2539 2540 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2541 return MCDisassembler::Fail; 2542 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 2543 return MCDisassembler::Fail; 2544 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) 2545 return MCDisassembler::Fail; 2546 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder))) 2547 return MCDisassembler::Fail; 2548 if (Rm != 0xF) { 2549 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2550 return MCDisassembler::Fail; 2551 } 2552 2553 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2554 return MCDisassembler::Fail; 2555 Inst.addOperand(MCOperand::CreateImm(align)); 2556 2557 if (Rm == 0xD) 2558 Inst.addOperand(MCOperand::CreateReg(0)); 2559 else if (Rm != 0xF) { 2560 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2561 return MCDisassembler::Fail; 2562 } 2563 2564 return S; 2565 } 2566 2567 static DecodeStatus 2568 DecodeNEONModImmInstruction(llvm::MCInst &Inst, unsigned Insn, 2569 uint64_t Address, const void *Decoder) { 2570 DecodeStatus S = MCDisassembler::Success; 2571 2572 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2573 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2574 unsigned imm = fieldFromInstruction32(Insn, 0, 4); 2575 imm |= fieldFromInstruction32(Insn, 16, 3) << 4; 2576 imm |= fieldFromInstruction32(Insn, 24, 1) << 7; 2577 imm |= fieldFromInstruction32(Insn, 8, 4) << 8; 2578 imm |= fieldFromInstruction32(Insn, 5, 1) << 12; 2579 unsigned Q = fieldFromInstruction32(Insn, 6, 1); 2580 2581 if (Q) { 2582 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 2583 return MCDisassembler::Fail; 2584 } else { 2585 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2586 return MCDisassembler::Fail; 2587 } 2588 2589 Inst.addOperand(MCOperand::CreateImm(imm)); 2590 2591 switch (Inst.getOpcode()) { 2592 case ARM::VORRiv4i16: 2593 case ARM::VORRiv2i32: 2594 case ARM::VBICiv4i16: 2595 case ARM::VBICiv2i32: 2596 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2597 return MCDisassembler::Fail; 2598 break; 2599 case ARM::VORRiv8i16: 2600 case ARM::VORRiv4i32: 2601 case ARM::VBICiv8i16: 2602 case ARM::VBICiv4i32: 2603 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 2604 return MCDisassembler::Fail; 2605 break; 2606 default: 2607 break; 2608 } 2609 2610 return S; 2611 } 2612 2613 static DecodeStatus DecodeVSHLMaxInstruction(llvm::MCInst &Inst, unsigned Insn, 2614 uint64_t Address, const void *Decoder) { 2615 DecodeStatus S = MCDisassembler::Success; 2616 2617 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2618 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2619 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2620 Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; 2621 unsigned size = fieldFromInstruction32(Insn, 18, 2); 2622 2623 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 2624 return MCDisassembler::Fail; 2625 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) 2626 return MCDisassembler::Fail; 2627 Inst.addOperand(MCOperand::CreateImm(8 << size)); 2628 2629 return S; 2630 } 2631 2632 static DecodeStatus DecodeShiftRight8Imm(llvm::MCInst &Inst, unsigned Val, 2633 uint64_t Address, const void *Decoder) { 2634 Inst.addOperand(MCOperand::CreateImm(8 - Val)); 2635 return MCDisassembler::Success; 2636 } 2637 2638 static DecodeStatus DecodeShiftRight16Imm(llvm::MCInst &Inst, unsigned Val, 2639 uint64_t Address, const void *Decoder) { 2640 Inst.addOperand(MCOperand::CreateImm(16 - Val)); 2641 return MCDisassembler::Success; 2642 } 2643 2644 static DecodeStatus DecodeShiftRight32Imm(llvm::MCInst &Inst, unsigned Val, 2645 uint64_t Address, const void *Decoder) { 2646 Inst.addOperand(MCOperand::CreateImm(32 - Val)); 2647 return MCDisassembler::Success; 2648 } 2649 2650 static DecodeStatus DecodeShiftRight64Imm(llvm::MCInst &Inst, unsigned Val, 2651 uint64_t Address, const void *Decoder) { 2652 Inst.addOperand(MCOperand::CreateImm(64 - Val)); 2653 return MCDisassembler::Success; 2654 } 2655 2656 static DecodeStatus DecodeTBLInstruction(llvm::MCInst &Inst, unsigned Insn, 2657 uint64_t Address, const void *Decoder) { 2658 DecodeStatus S = MCDisassembler::Success; 2659 2660 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2661 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2662 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2663 Rn |= fieldFromInstruction32(Insn, 7, 1) << 4; 2664 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2665 Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; 2666 unsigned op = fieldFromInstruction32(Insn, 6, 1); 2667 unsigned length = fieldFromInstruction32(Insn, 8, 2) + 1; 2668 2669 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2670 return MCDisassembler::Fail; 2671 if (op) { 2672 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2673 return MCDisassembler::Fail; // Writeback 2674 } 2675 2676 for (unsigned i = 0; i < length; ++i) { 2677 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rn+i)%32, Address, Decoder))) 2678 return MCDisassembler::Fail; 2679 } 2680 2681 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) 2682 return MCDisassembler::Fail; 2683 2684 return S; 2685 } 2686 2687 static DecodeStatus DecodeThumbAddSpecialReg(llvm::MCInst &Inst, uint16_t Insn, 2688 uint64_t Address, const void *Decoder) { 2689 DecodeStatus S = MCDisassembler::Success; 2690 2691 unsigned dst = fieldFromInstruction16(Insn, 8, 3); 2692 unsigned imm = fieldFromInstruction16(Insn, 0, 8); 2693 2694 if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder))) 2695 return MCDisassembler::Fail; 2696 2697 switch(Inst.getOpcode()) { 2698 default: 2699 return MCDisassembler::Fail; 2700 case ARM::tADR: 2701 break; // tADR does not explicitly represent the PC as an operand. 2702 case ARM::tADDrSPi: 2703 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 2704 break; 2705 } 2706 2707 Inst.addOperand(MCOperand::CreateImm(imm)); 2708 return S; 2709 } 2710 2711 static DecodeStatus DecodeThumbBROperand(llvm::MCInst &Inst, unsigned Val, 2712 uint64_t Address, const void *Decoder) { 2713 Inst.addOperand(MCOperand::CreateImm(SignExtend32<12>(Val << 1))); 2714 return MCDisassembler::Success; 2715 } 2716 2717 static DecodeStatus DecodeT2BROperand(llvm::MCInst &Inst, unsigned Val, 2718 uint64_t Address, const void *Decoder) { 2719 Inst.addOperand(MCOperand::CreateImm(SignExtend32<21>(Val))); 2720 return MCDisassembler::Success; 2721 } 2722 2723 static DecodeStatus DecodeThumbCmpBROperand(llvm::MCInst &Inst, unsigned Val, 2724 uint64_t Address, const void *Decoder) { 2725 Inst.addOperand(MCOperand::CreateImm(SignExtend32<7>(Val << 1))); 2726 return MCDisassembler::Success; 2727 } 2728 2729 static DecodeStatus DecodeThumbAddrModeRR(llvm::MCInst &Inst, unsigned Val, 2730 uint64_t Address, const void *Decoder) { 2731 DecodeStatus S = MCDisassembler::Success; 2732 2733 unsigned Rn = fieldFromInstruction32(Val, 0, 3); 2734 unsigned Rm = fieldFromInstruction32(Val, 3, 3); 2735 2736 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) 2737 return MCDisassembler::Fail; 2738 if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder))) 2739 return MCDisassembler::Fail; 2740 2741 return S; 2742 } 2743 2744 static DecodeStatus DecodeThumbAddrModeIS(llvm::MCInst &Inst, unsigned Val, 2745 uint64_t Address, const void *Decoder) { 2746 DecodeStatus S = MCDisassembler::Success; 2747 2748 unsigned Rn = fieldFromInstruction32(Val, 0, 3); 2749 unsigned imm = fieldFromInstruction32(Val, 3, 5); 2750 2751 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) 2752 return MCDisassembler::Fail; 2753 Inst.addOperand(MCOperand::CreateImm(imm)); 2754 2755 return S; 2756 } 2757 2758 static DecodeStatus DecodeThumbAddrModePC(llvm::MCInst &Inst, unsigned Val, 2759 uint64_t Address, const void *Decoder) { 2760 unsigned imm = Val << 2; 2761 2762 Inst.addOperand(MCOperand::CreateImm(imm)); 2763 tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder); 2764 2765 return MCDisassembler::Success; 2766 } 2767 2768 static DecodeStatus DecodeThumbAddrModeSP(llvm::MCInst &Inst, unsigned Val, 2769 uint64_t Address, const void *Decoder) { 2770 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 2771 Inst.addOperand(MCOperand::CreateImm(Val)); 2772 2773 return MCDisassembler::Success; 2774 } 2775 2776 static DecodeStatus DecodeT2AddrModeSOReg(llvm::MCInst &Inst, unsigned Val, 2777 uint64_t Address, const void *Decoder) { 2778 DecodeStatus S = MCDisassembler::Success; 2779 2780 unsigned Rn = fieldFromInstruction32(Val, 6, 4); 2781 unsigned Rm = fieldFromInstruction32(Val, 2, 4); 2782 unsigned imm = fieldFromInstruction32(Val, 0, 2); 2783 2784 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2785 return MCDisassembler::Fail; 2786 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) 2787 return MCDisassembler::Fail; 2788 Inst.addOperand(MCOperand::CreateImm(imm)); 2789 2790 return S; 2791 } 2792 2793 static DecodeStatus DecodeT2LoadShift(llvm::MCInst &Inst, unsigned Insn, 2794 uint64_t Address, const void *Decoder) { 2795 DecodeStatus S = MCDisassembler::Success; 2796 2797 switch (Inst.getOpcode()) { 2798 case ARM::t2PLDs: 2799 case ARM::t2PLDWs: 2800 case ARM::t2PLIs: 2801 break; 2802 default: { 2803 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 2804 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 2805 return MCDisassembler::Fail; 2806 } 2807 } 2808 2809 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2810 if (Rn == 0xF) { 2811 switch (Inst.getOpcode()) { 2812 case ARM::t2LDRBs: 2813 Inst.setOpcode(ARM::t2LDRBpci); 2814 break; 2815 case ARM::t2LDRHs: 2816 Inst.setOpcode(ARM::t2LDRHpci); 2817 break; 2818 case ARM::t2LDRSHs: 2819 Inst.setOpcode(ARM::t2LDRSHpci); 2820 break; 2821 case ARM::t2LDRSBs: 2822 Inst.setOpcode(ARM::t2LDRSBpci); 2823 break; 2824 case ARM::t2PLDs: 2825 Inst.setOpcode(ARM::t2PLDi12); 2826 Inst.addOperand(MCOperand::CreateReg(ARM::PC)); 2827 break; 2828 default: 2829 return MCDisassembler::Fail; 2830 } 2831 2832 int imm = fieldFromInstruction32(Insn, 0, 12); 2833 if (!fieldFromInstruction32(Insn, 23, 1)) imm *= -1; 2834 Inst.addOperand(MCOperand::CreateImm(imm)); 2835 2836 return S; 2837 } 2838 2839 unsigned addrmode = fieldFromInstruction32(Insn, 4, 2); 2840 addrmode |= fieldFromInstruction32(Insn, 0, 4) << 2; 2841 addrmode |= fieldFromInstruction32(Insn, 16, 4) << 6; 2842 if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder))) 2843 return MCDisassembler::Fail; 2844 2845 return S; 2846 } 2847 2848 static DecodeStatus DecodeT2Imm8S4(llvm::MCInst &Inst, unsigned Val, 2849 uint64_t Address, const void *Decoder) { 2850 int imm = Val & 0xFF; 2851 if (!(Val & 0x100)) imm *= -1; 2852 Inst.addOperand(MCOperand::CreateImm(imm << 2)); 2853 2854 return MCDisassembler::Success; 2855 } 2856 2857 static DecodeStatus DecodeT2AddrModeImm8s4(llvm::MCInst &Inst, unsigned Val, 2858 uint64_t Address, const void *Decoder) { 2859 DecodeStatus S = MCDisassembler::Success; 2860 2861 unsigned Rn = fieldFromInstruction32(Val, 9, 4); 2862 unsigned imm = fieldFromInstruction32(Val, 0, 9); 2863 2864 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2865 return MCDisassembler::Fail; 2866 if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder))) 2867 return MCDisassembler::Fail; 2868 2869 return S; 2870 } 2871 2872 static DecodeStatus DecodeT2AddrModeImm0_1020s4(llvm::MCInst &Inst,unsigned Val, 2873 uint64_t Address, const void *Decoder) { 2874 DecodeStatus S = MCDisassembler::Success; 2875 2876 unsigned Rn = fieldFromInstruction32(Val, 8, 4); 2877 unsigned imm = fieldFromInstruction32(Val, 0, 8); 2878 2879 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 2880 return MCDisassembler::Fail; 2881 2882 Inst.addOperand(MCOperand::CreateImm(imm)); 2883 2884 return S; 2885 } 2886 2887 static DecodeStatus DecodeT2Imm8(llvm::MCInst &Inst, unsigned Val, 2888 uint64_t Address, const void *Decoder) { 2889 int imm = Val & 0xFF; 2890 if (Val == 0) 2891 imm = INT32_MIN; 2892 else if (!(Val & 0x100)) 2893 imm *= -1; 2894 Inst.addOperand(MCOperand::CreateImm(imm)); 2895 2896 return MCDisassembler::Success; 2897 } 2898 2899 2900 static DecodeStatus DecodeT2AddrModeImm8(llvm::MCInst &Inst, unsigned Val, 2901 uint64_t Address, const void *Decoder) { 2902 DecodeStatus S = MCDisassembler::Success; 2903 2904 unsigned Rn = fieldFromInstruction32(Val, 9, 4); 2905 unsigned imm = fieldFromInstruction32(Val, 0, 9); 2906 2907 // Some instructions always use an additive offset. 2908 switch (Inst.getOpcode()) { 2909 case ARM::t2LDRT: 2910 case ARM::t2LDRBT: 2911 case ARM::t2LDRHT: 2912 case ARM::t2LDRSBT: 2913 case ARM::t2LDRSHT: 2914 case ARM::t2STRT: 2915 case ARM::t2STRBT: 2916 case ARM::t2STRHT: 2917 imm |= 0x100; 2918 break; 2919 default: 2920 break; 2921 } 2922 2923 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2924 return MCDisassembler::Fail; 2925 if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder))) 2926 return MCDisassembler::Fail; 2927 2928 return S; 2929 } 2930 2931 static DecodeStatus DecodeT2LdStPre(llvm::MCInst &Inst, unsigned Insn, 2932 uint64_t Address, const void *Decoder) { 2933 DecodeStatus S = MCDisassembler::Success; 2934 2935 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 2936 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2937 unsigned addr = fieldFromInstruction32(Insn, 0, 8); 2938 addr |= fieldFromInstruction32(Insn, 9, 1) << 8; 2939 addr |= Rn << 9; 2940 unsigned load = fieldFromInstruction32(Insn, 20, 1); 2941 2942 if (!load) { 2943 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2944 return MCDisassembler::Fail; 2945 } 2946 2947 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 2948 return MCDisassembler::Fail; 2949 2950 if (load) { 2951 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2952 return MCDisassembler::Fail; 2953 } 2954 2955 if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder))) 2956 return MCDisassembler::Fail; 2957 2958 return S; 2959 } 2960 2961 static DecodeStatus DecodeT2AddrModeImm12(llvm::MCInst &Inst, unsigned Val, 2962 uint64_t Address, const void *Decoder) { 2963 DecodeStatus S = MCDisassembler::Success; 2964 2965 unsigned Rn = fieldFromInstruction32(Val, 13, 4); 2966 unsigned imm = fieldFromInstruction32(Val, 0, 12); 2967 2968 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2969 return MCDisassembler::Fail; 2970 Inst.addOperand(MCOperand::CreateImm(imm)); 2971 2972 return S; 2973 } 2974 2975 2976 static DecodeStatus DecodeThumbAddSPImm(llvm::MCInst &Inst, uint16_t Insn, 2977 uint64_t Address, const void *Decoder) { 2978 unsigned imm = fieldFromInstruction16(Insn, 0, 7); 2979 2980 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 2981 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 2982 Inst.addOperand(MCOperand::CreateImm(imm)); 2983 2984 return MCDisassembler::Success; 2985 } 2986 2987 static DecodeStatus DecodeThumbAddSPReg(llvm::MCInst &Inst, uint16_t Insn, 2988 uint64_t Address, const void *Decoder) { 2989 DecodeStatus S = MCDisassembler::Success; 2990 2991 if (Inst.getOpcode() == ARM::tADDrSP) { 2992 unsigned Rdm = fieldFromInstruction16(Insn, 0, 3); 2993 Rdm |= fieldFromInstruction16(Insn, 7, 1) << 3; 2994 2995 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) 2996 return MCDisassembler::Fail; 2997 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) 2998 return MCDisassembler::Fail; 2999 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3000 } else if (Inst.getOpcode() == ARM::tADDspr) { 3001 unsigned Rm = fieldFromInstruction16(Insn, 3, 4); 3002 3003 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3004 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3005 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3006 return MCDisassembler::Fail; 3007 } 3008 3009 return S; 3010 } 3011 3012 static DecodeStatus DecodeThumbCPS(llvm::MCInst &Inst, uint16_t Insn, 3013 uint64_t Address, const void *Decoder) { 3014 unsigned imod = fieldFromInstruction16(Insn, 4, 1) | 0x2; 3015 unsigned flags = fieldFromInstruction16(Insn, 0, 3); 3016 3017 Inst.addOperand(MCOperand::CreateImm(imod)); 3018 Inst.addOperand(MCOperand::CreateImm(flags)); 3019 3020 return MCDisassembler::Success; 3021 } 3022 3023 static DecodeStatus DecodePostIdxReg(llvm::MCInst &Inst, unsigned Insn, 3024 uint64_t Address, const void *Decoder) { 3025 DecodeStatus S = MCDisassembler::Success; 3026 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3027 unsigned add = fieldFromInstruction32(Insn, 4, 1); 3028 3029 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3030 return MCDisassembler::Fail; 3031 Inst.addOperand(MCOperand::CreateImm(add)); 3032 3033 return S; 3034 } 3035 3036 static DecodeStatus DecodeThumbBLXOffset(llvm::MCInst &Inst, unsigned Val, 3037 uint64_t Address, const void *Decoder) { 3038 if (!tryAddingSymbolicOperand(Address, 3039 (Address & ~2u) + SignExtend32<22>(Val << 1) + 4, 3040 true, 4, Inst, Decoder)) 3041 Inst.addOperand(MCOperand::CreateImm(SignExtend32<22>(Val << 1))); 3042 return MCDisassembler::Success; 3043 } 3044 3045 static DecodeStatus DecodeCoprocessor(llvm::MCInst &Inst, unsigned Val, 3046 uint64_t Address, const void *Decoder) { 3047 if (Val == 0xA || Val == 0xB) 3048 return MCDisassembler::Fail; 3049 3050 Inst.addOperand(MCOperand::CreateImm(Val)); 3051 return MCDisassembler::Success; 3052 } 3053 3054 static DecodeStatus 3055 DecodeThumbTableBranch(llvm::MCInst &Inst, unsigned Insn, 3056 uint64_t Address, const void *Decoder) { 3057 DecodeStatus S = MCDisassembler::Success; 3058 3059 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3060 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3061 3062 if (Rn == ARM::SP) S = MCDisassembler::SoftFail; 3063 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3064 return MCDisassembler::Fail; 3065 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) 3066 return MCDisassembler::Fail; 3067 return S; 3068 } 3069 3070 static DecodeStatus 3071 DecodeThumb2BCCInstruction(llvm::MCInst &Inst, unsigned Insn, 3072 uint64_t Address, const void *Decoder) { 3073 DecodeStatus S = MCDisassembler::Success; 3074 3075 unsigned pred = fieldFromInstruction32(Insn, 22, 4); 3076 if (pred == 0xE || pred == 0xF) { 3077 unsigned opc = fieldFromInstruction32(Insn, 4, 28); 3078 switch (opc) { 3079 default: 3080 return MCDisassembler::Fail; 3081 case 0xf3bf8f4: 3082 Inst.setOpcode(ARM::t2DSB); 3083 break; 3084 case 0xf3bf8f5: 3085 Inst.setOpcode(ARM::t2DMB); 3086 break; 3087 case 0xf3bf8f6: 3088 Inst.setOpcode(ARM::t2ISB); 3089 break; 3090 } 3091 3092 unsigned imm = fieldFromInstruction32(Insn, 0, 4); 3093 return DecodeMemBarrierOption(Inst, imm, Address, Decoder); 3094 } 3095 3096 unsigned brtarget = fieldFromInstruction32(Insn, 0, 11) << 1; 3097 brtarget |= fieldFromInstruction32(Insn, 11, 1) << 19; 3098 brtarget |= fieldFromInstruction32(Insn, 13, 1) << 18; 3099 brtarget |= fieldFromInstruction32(Insn, 16, 6) << 12; 3100 brtarget |= fieldFromInstruction32(Insn, 26, 1) << 20; 3101 3102 if (!Check(S, DecodeT2BROperand(Inst, brtarget, Address, Decoder))) 3103 return MCDisassembler::Fail; 3104 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3105 return MCDisassembler::Fail; 3106 3107 return S; 3108 } 3109 3110 // Decode a shifted immediate operand. These basically consist 3111 // of an 8-bit value, and a 4-bit directive that specifies either 3112 // a splat operation or a rotation. 3113 static DecodeStatus DecodeT2SOImm(llvm::MCInst &Inst, unsigned Val, 3114 uint64_t Address, const void *Decoder) { 3115 unsigned ctrl = fieldFromInstruction32(Val, 10, 2); 3116 if (ctrl == 0) { 3117 unsigned byte = fieldFromInstruction32(Val, 8, 2); 3118 unsigned imm = fieldFromInstruction32(Val, 0, 8); 3119 switch (byte) { 3120 case 0: 3121 Inst.addOperand(MCOperand::CreateImm(imm)); 3122 break; 3123 case 1: 3124 Inst.addOperand(MCOperand::CreateImm((imm << 16) | imm)); 3125 break; 3126 case 2: 3127 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 8))); 3128 break; 3129 case 3: 3130 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 16) | 3131 (imm << 8) | imm)); 3132 break; 3133 } 3134 } else { 3135 unsigned unrot = fieldFromInstruction32(Val, 0, 7) | 0x80; 3136 unsigned rot = fieldFromInstruction32(Val, 7, 5); 3137 unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31)); 3138 Inst.addOperand(MCOperand::CreateImm(imm)); 3139 } 3140 3141 return MCDisassembler::Success; 3142 } 3143 3144 static DecodeStatus 3145 DecodeThumbBCCTargetOperand(llvm::MCInst &Inst, unsigned Val, 3146 uint64_t Address, const void *Decoder){ 3147 Inst.addOperand(MCOperand::CreateImm(Val << 1)); 3148 return MCDisassembler::Success; 3149 } 3150 3151 static DecodeStatus DecodeThumbBLTargetOperand(llvm::MCInst &Inst, unsigned Val, 3152 uint64_t Address, const void *Decoder){ 3153 Inst.addOperand(MCOperand::CreateImm(SignExtend32<22>(Val << 1))); 3154 return MCDisassembler::Success; 3155 } 3156 3157 static DecodeStatus DecodeMemBarrierOption(llvm::MCInst &Inst, unsigned Val, 3158 uint64_t Address, const void *Decoder) { 3159 switch (Val) { 3160 default: 3161 return MCDisassembler::Fail; 3162 case 0xF: // SY 3163 case 0xE: // ST 3164 case 0xB: // ISH 3165 case 0xA: // ISHST 3166 case 0x7: // NSH 3167 case 0x6: // NSHST 3168 case 0x3: // OSH 3169 case 0x2: // OSHST 3170 break; 3171 } 3172 3173 Inst.addOperand(MCOperand::CreateImm(Val)); 3174 return MCDisassembler::Success; 3175 } 3176 3177 static DecodeStatus DecodeMSRMask(llvm::MCInst &Inst, unsigned Val, 3178 uint64_t Address, const void *Decoder) { 3179 if (!Val) return MCDisassembler::Fail; 3180 Inst.addOperand(MCOperand::CreateImm(Val)); 3181 return MCDisassembler::Success; 3182 } 3183 3184 static DecodeStatus DecodeDoubleRegLoad(llvm::MCInst &Inst, unsigned Insn, 3185 uint64_t Address, const void *Decoder) { 3186 DecodeStatus S = MCDisassembler::Success; 3187 3188 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3189 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3190 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3191 3192 if ((Rt & 1) || Rt == 0xE || Rn == 0xF) return MCDisassembler::Fail; 3193 3194 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3195 return MCDisassembler::Fail; 3196 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 3197 return MCDisassembler::Fail; 3198 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3199 return MCDisassembler::Fail; 3200 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3201 return MCDisassembler::Fail; 3202 3203 return S; 3204 } 3205 3206 3207 static DecodeStatus DecodeDoubleRegStore(llvm::MCInst &Inst, unsigned Insn, 3208 uint64_t Address, const void *Decoder){ 3209 DecodeStatus S = MCDisassembler::Success; 3210 3211 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3212 unsigned Rt = fieldFromInstruction32(Insn, 0, 4); 3213 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3214 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3215 3216 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 3217 return MCDisassembler::Fail; 3218 3219 if ((Rt & 1) || Rt == 0xE || Rn == 0xF) return MCDisassembler::Fail; 3220 if (Rd == Rn || Rd == Rt || Rd == Rt+1) return MCDisassembler::Fail; 3221 3222 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3223 return MCDisassembler::Fail; 3224 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 3225 return MCDisassembler::Fail; 3226 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3227 return MCDisassembler::Fail; 3228 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3229 return MCDisassembler::Fail; 3230 3231 return S; 3232 } 3233 3234 static DecodeStatus DecodeLDRPreImm(llvm::MCInst &Inst, unsigned Insn, 3235 uint64_t Address, const void *Decoder) { 3236 DecodeStatus S = MCDisassembler::Success; 3237 3238 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3239 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3240 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 3241 imm |= fieldFromInstruction32(Insn, 16, 4) << 13; 3242 imm |= fieldFromInstruction32(Insn, 23, 1) << 12; 3243 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3244 3245 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3246 3247 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3248 return MCDisassembler::Fail; 3249 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3250 return MCDisassembler::Fail; 3251 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) 3252 return MCDisassembler::Fail; 3253 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3254 return MCDisassembler::Fail; 3255 3256 return S; 3257 } 3258 3259 static DecodeStatus DecodeLDRPreReg(llvm::MCInst &Inst, unsigned Insn, 3260 uint64_t Address, const void *Decoder) { 3261 DecodeStatus S = MCDisassembler::Success; 3262 3263 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3264 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3265 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 3266 imm |= fieldFromInstruction32(Insn, 16, 4) << 13; 3267 imm |= fieldFromInstruction32(Insn, 23, 1) << 12; 3268 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3269 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3270 3271 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3272 if (Rm == 0xF) S = MCDisassembler::SoftFail; 3273 3274 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3275 return MCDisassembler::Fail; 3276 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3277 return MCDisassembler::Fail; 3278 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) 3279 return MCDisassembler::Fail; 3280 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3281 return MCDisassembler::Fail; 3282 3283 return S; 3284 } 3285 3286 3287 static DecodeStatus DecodeSTRPreImm(llvm::MCInst &Inst, unsigned Insn, 3288 uint64_t Address, const void *Decoder) { 3289 DecodeStatus S = MCDisassembler::Success; 3290 3291 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3292 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3293 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 3294 imm |= fieldFromInstruction32(Insn, 16, 4) << 13; 3295 imm |= fieldFromInstruction32(Insn, 23, 1) << 12; 3296 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3297 3298 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3299 3300 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3301 return MCDisassembler::Fail; 3302 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3303 return MCDisassembler::Fail; 3304 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) 3305 return MCDisassembler::Fail; 3306 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3307 return MCDisassembler::Fail; 3308 3309 return S; 3310 } 3311 3312 static DecodeStatus DecodeSTRPreReg(llvm::MCInst &Inst, unsigned Insn, 3313 uint64_t Address, const void *Decoder) { 3314 DecodeStatus S = MCDisassembler::Success; 3315 3316 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3317 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3318 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 3319 imm |= fieldFromInstruction32(Insn, 16, 4) << 13; 3320 imm |= fieldFromInstruction32(Insn, 23, 1) << 12; 3321 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3322 3323 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3324 3325 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3326 return MCDisassembler::Fail; 3327 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3328 return MCDisassembler::Fail; 3329 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) 3330 return MCDisassembler::Fail; 3331 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3332 return MCDisassembler::Fail; 3333 3334 return S; 3335 } 3336 3337 static DecodeStatus DecodeVLD1LN(llvm::MCInst &Inst, unsigned Insn, 3338 uint64_t Address, const void *Decoder) { 3339 DecodeStatus S = MCDisassembler::Success; 3340 3341 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3342 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3343 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3344 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3345 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3346 3347 unsigned align = 0; 3348 unsigned index = 0; 3349 switch (size) { 3350 default: 3351 return MCDisassembler::Fail; 3352 case 0: 3353 if (fieldFromInstruction32(Insn, 4, 1)) 3354 return MCDisassembler::Fail; // UNDEFINED 3355 index = fieldFromInstruction32(Insn, 5, 3); 3356 break; 3357 case 1: 3358 if (fieldFromInstruction32(Insn, 5, 1)) 3359 return MCDisassembler::Fail; // UNDEFINED 3360 index = fieldFromInstruction32(Insn, 6, 2); 3361 if (fieldFromInstruction32(Insn, 4, 1)) 3362 align = 2; 3363 break; 3364 case 2: 3365 if (fieldFromInstruction32(Insn, 6, 1)) 3366 return MCDisassembler::Fail; // UNDEFINED 3367 index = fieldFromInstruction32(Insn, 7, 1); 3368 if (fieldFromInstruction32(Insn, 4, 2) != 0) 3369 align = 4; 3370 } 3371 3372 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3373 return MCDisassembler::Fail; 3374 if (Rm != 0xF) { // Writeback 3375 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3376 return MCDisassembler::Fail; 3377 } 3378 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3379 return MCDisassembler::Fail; 3380 Inst.addOperand(MCOperand::CreateImm(align)); 3381 if (Rm != 0xF) { 3382 if (Rm != 0xD) { 3383 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3384 return MCDisassembler::Fail; 3385 } else 3386 Inst.addOperand(MCOperand::CreateReg(0)); 3387 } 3388 3389 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3390 return MCDisassembler::Fail; 3391 Inst.addOperand(MCOperand::CreateImm(index)); 3392 3393 return S; 3394 } 3395 3396 static DecodeStatus DecodeVST1LN(llvm::MCInst &Inst, unsigned Insn, 3397 uint64_t Address, const void *Decoder) { 3398 DecodeStatus S = MCDisassembler::Success; 3399 3400 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3401 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3402 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3403 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3404 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3405 3406 unsigned align = 0; 3407 unsigned index = 0; 3408 switch (size) { 3409 default: 3410 return MCDisassembler::Fail; 3411 case 0: 3412 if (fieldFromInstruction32(Insn, 4, 1)) 3413 return MCDisassembler::Fail; // UNDEFINED 3414 index = fieldFromInstruction32(Insn, 5, 3); 3415 break; 3416 case 1: 3417 if (fieldFromInstruction32(Insn, 5, 1)) 3418 return MCDisassembler::Fail; // UNDEFINED 3419 index = fieldFromInstruction32(Insn, 6, 2); 3420 if (fieldFromInstruction32(Insn, 4, 1)) 3421 align = 2; 3422 break; 3423 case 2: 3424 if (fieldFromInstruction32(Insn, 6, 1)) 3425 return MCDisassembler::Fail; // UNDEFINED 3426 index = fieldFromInstruction32(Insn, 7, 1); 3427 if (fieldFromInstruction32(Insn, 4, 2) != 0) 3428 align = 4; 3429 } 3430 3431 if (Rm != 0xF) { // Writeback 3432 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3433 return MCDisassembler::Fail; 3434 } 3435 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3436 return MCDisassembler::Fail; 3437 Inst.addOperand(MCOperand::CreateImm(align)); 3438 if (Rm != 0xF) { 3439 if (Rm != 0xD) { 3440 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3441 return MCDisassembler::Fail; 3442 } else 3443 Inst.addOperand(MCOperand::CreateReg(0)); 3444 } 3445 3446 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3447 return MCDisassembler::Fail; 3448 Inst.addOperand(MCOperand::CreateImm(index)); 3449 3450 return S; 3451 } 3452 3453 3454 static DecodeStatus DecodeVLD2LN(llvm::MCInst &Inst, unsigned Insn, 3455 uint64_t Address, const void *Decoder) { 3456 DecodeStatus S = MCDisassembler::Success; 3457 3458 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3459 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3460 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3461 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3462 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3463 3464 unsigned align = 0; 3465 unsigned index = 0; 3466 unsigned inc = 1; 3467 switch (size) { 3468 default: 3469 return MCDisassembler::Fail; 3470 case 0: 3471 index = fieldFromInstruction32(Insn, 5, 3); 3472 if (fieldFromInstruction32(Insn, 4, 1)) 3473 align = 2; 3474 break; 3475 case 1: 3476 index = fieldFromInstruction32(Insn, 6, 2); 3477 if (fieldFromInstruction32(Insn, 4, 1)) 3478 align = 4; 3479 if (fieldFromInstruction32(Insn, 5, 1)) 3480 inc = 2; 3481 break; 3482 case 2: 3483 if (fieldFromInstruction32(Insn, 5, 1)) 3484 return MCDisassembler::Fail; // UNDEFINED 3485 index = fieldFromInstruction32(Insn, 7, 1); 3486 if (fieldFromInstruction32(Insn, 4, 1) != 0) 3487 align = 8; 3488 if (fieldFromInstruction32(Insn, 6, 1)) 3489 inc = 2; 3490 break; 3491 } 3492 3493 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3494 return MCDisassembler::Fail; 3495 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3496 return MCDisassembler::Fail; 3497 if (Rm != 0xF) { // Writeback 3498 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3499 return MCDisassembler::Fail; 3500 } 3501 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3502 return MCDisassembler::Fail; 3503 Inst.addOperand(MCOperand::CreateImm(align)); 3504 if (Rm != 0xF) { 3505 if (Rm != 0xD) { 3506 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3507 return MCDisassembler::Fail; 3508 } else 3509 Inst.addOperand(MCOperand::CreateReg(0)); 3510 } 3511 3512 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3513 return MCDisassembler::Fail; 3514 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3515 return MCDisassembler::Fail; 3516 Inst.addOperand(MCOperand::CreateImm(index)); 3517 3518 return S; 3519 } 3520 3521 static DecodeStatus DecodeVST2LN(llvm::MCInst &Inst, unsigned Insn, 3522 uint64_t Address, const void *Decoder) { 3523 DecodeStatus S = MCDisassembler::Success; 3524 3525 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3526 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3527 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3528 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3529 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3530 3531 unsigned align = 0; 3532 unsigned index = 0; 3533 unsigned inc = 1; 3534 switch (size) { 3535 default: 3536 return MCDisassembler::Fail; 3537 case 0: 3538 index = fieldFromInstruction32(Insn, 5, 3); 3539 if (fieldFromInstruction32(Insn, 4, 1)) 3540 align = 2; 3541 break; 3542 case 1: 3543 index = fieldFromInstruction32(Insn, 6, 2); 3544 if (fieldFromInstruction32(Insn, 4, 1)) 3545 align = 4; 3546 if (fieldFromInstruction32(Insn, 5, 1)) 3547 inc = 2; 3548 break; 3549 case 2: 3550 if (fieldFromInstruction32(Insn, 5, 1)) 3551 return MCDisassembler::Fail; // UNDEFINED 3552 index = fieldFromInstruction32(Insn, 7, 1); 3553 if (fieldFromInstruction32(Insn, 4, 1) != 0) 3554 align = 8; 3555 if (fieldFromInstruction32(Insn, 6, 1)) 3556 inc = 2; 3557 break; 3558 } 3559 3560 if (Rm != 0xF) { // Writeback 3561 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3562 return MCDisassembler::Fail; 3563 } 3564 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3565 return MCDisassembler::Fail; 3566 Inst.addOperand(MCOperand::CreateImm(align)); 3567 if (Rm != 0xF) { 3568 if (Rm != 0xD) { 3569 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3570 return MCDisassembler::Fail; 3571 } else 3572 Inst.addOperand(MCOperand::CreateReg(0)); 3573 } 3574 3575 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3576 return MCDisassembler::Fail; 3577 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3578 return MCDisassembler::Fail; 3579 Inst.addOperand(MCOperand::CreateImm(index)); 3580 3581 return S; 3582 } 3583 3584 3585 static DecodeStatus DecodeVLD3LN(llvm::MCInst &Inst, unsigned Insn, 3586 uint64_t Address, const void *Decoder) { 3587 DecodeStatus S = MCDisassembler::Success; 3588 3589 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3590 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3591 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3592 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3593 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3594 3595 unsigned align = 0; 3596 unsigned index = 0; 3597 unsigned inc = 1; 3598 switch (size) { 3599 default: 3600 return MCDisassembler::Fail; 3601 case 0: 3602 if (fieldFromInstruction32(Insn, 4, 1)) 3603 return MCDisassembler::Fail; // UNDEFINED 3604 index = fieldFromInstruction32(Insn, 5, 3); 3605 break; 3606 case 1: 3607 if (fieldFromInstruction32(Insn, 4, 1)) 3608 return MCDisassembler::Fail; // UNDEFINED 3609 index = fieldFromInstruction32(Insn, 6, 2); 3610 if (fieldFromInstruction32(Insn, 5, 1)) 3611 inc = 2; 3612 break; 3613 case 2: 3614 if (fieldFromInstruction32(Insn, 4, 2)) 3615 return MCDisassembler::Fail; // UNDEFINED 3616 index = fieldFromInstruction32(Insn, 7, 1); 3617 if (fieldFromInstruction32(Insn, 6, 1)) 3618 inc = 2; 3619 break; 3620 } 3621 3622 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3623 return MCDisassembler::Fail; 3624 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3625 return MCDisassembler::Fail; 3626 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3627 return MCDisassembler::Fail; 3628 3629 if (Rm != 0xF) { // Writeback 3630 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3631 return MCDisassembler::Fail; 3632 } 3633 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3634 return MCDisassembler::Fail; 3635 Inst.addOperand(MCOperand::CreateImm(align)); 3636 if (Rm != 0xF) { 3637 if (Rm != 0xD) { 3638 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3639 return MCDisassembler::Fail; 3640 } else 3641 Inst.addOperand(MCOperand::CreateReg(0)); 3642 } 3643 3644 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3645 return MCDisassembler::Fail; 3646 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3647 return MCDisassembler::Fail; 3648 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3649 return MCDisassembler::Fail; 3650 Inst.addOperand(MCOperand::CreateImm(index)); 3651 3652 return S; 3653 } 3654 3655 static DecodeStatus DecodeVST3LN(llvm::MCInst &Inst, unsigned Insn, 3656 uint64_t Address, const void *Decoder) { 3657 DecodeStatus S = MCDisassembler::Success; 3658 3659 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3660 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3661 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3662 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3663 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3664 3665 unsigned align = 0; 3666 unsigned index = 0; 3667 unsigned inc = 1; 3668 switch (size) { 3669 default: 3670 return MCDisassembler::Fail; 3671 case 0: 3672 if (fieldFromInstruction32(Insn, 4, 1)) 3673 return MCDisassembler::Fail; // UNDEFINED 3674 index = fieldFromInstruction32(Insn, 5, 3); 3675 break; 3676 case 1: 3677 if (fieldFromInstruction32(Insn, 4, 1)) 3678 return MCDisassembler::Fail; // UNDEFINED 3679 index = fieldFromInstruction32(Insn, 6, 2); 3680 if (fieldFromInstruction32(Insn, 5, 1)) 3681 inc = 2; 3682 break; 3683 case 2: 3684 if (fieldFromInstruction32(Insn, 4, 2)) 3685 return MCDisassembler::Fail; // UNDEFINED 3686 index = fieldFromInstruction32(Insn, 7, 1); 3687 if (fieldFromInstruction32(Insn, 6, 1)) 3688 inc = 2; 3689 break; 3690 } 3691 3692 if (Rm != 0xF) { // Writeback 3693 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3694 return MCDisassembler::Fail; 3695 } 3696 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3697 return MCDisassembler::Fail; 3698 Inst.addOperand(MCOperand::CreateImm(align)); 3699 if (Rm != 0xF) { 3700 if (Rm != 0xD) { 3701 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3702 return MCDisassembler::Fail; 3703 } else 3704 Inst.addOperand(MCOperand::CreateReg(0)); 3705 } 3706 3707 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3708 return MCDisassembler::Fail; 3709 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3710 return MCDisassembler::Fail; 3711 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3712 return MCDisassembler::Fail; 3713 Inst.addOperand(MCOperand::CreateImm(index)); 3714 3715 return S; 3716 } 3717 3718 3719 static DecodeStatus DecodeVLD4LN(llvm::MCInst &Inst, unsigned Insn, 3720 uint64_t Address, const void *Decoder) { 3721 DecodeStatus S = MCDisassembler::Success; 3722 3723 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3724 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3725 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3726 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3727 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3728 3729 unsigned align = 0; 3730 unsigned index = 0; 3731 unsigned inc = 1; 3732 switch (size) { 3733 default: 3734 return MCDisassembler::Fail; 3735 case 0: 3736 if (fieldFromInstruction32(Insn, 4, 1)) 3737 align = 4; 3738 index = fieldFromInstruction32(Insn, 5, 3); 3739 break; 3740 case 1: 3741 if (fieldFromInstruction32(Insn, 4, 1)) 3742 align = 8; 3743 index = fieldFromInstruction32(Insn, 6, 2); 3744 if (fieldFromInstruction32(Insn, 5, 1)) 3745 inc = 2; 3746 break; 3747 case 2: 3748 if (fieldFromInstruction32(Insn, 4, 2)) 3749 align = 4 << fieldFromInstruction32(Insn, 4, 2); 3750 index = fieldFromInstruction32(Insn, 7, 1); 3751 if (fieldFromInstruction32(Insn, 6, 1)) 3752 inc = 2; 3753 break; 3754 } 3755 3756 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3757 return MCDisassembler::Fail; 3758 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3759 return MCDisassembler::Fail; 3760 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3761 return MCDisassembler::Fail; 3762 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 3763 return MCDisassembler::Fail; 3764 3765 if (Rm != 0xF) { // Writeback 3766 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3767 return MCDisassembler::Fail; 3768 } 3769 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3770 return MCDisassembler::Fail; 3771 Inst.addOperand(MCOperand::CreateImm(align)); 3772 if (Rm != 0xF) { 3773 if (Rm != 0xD) { 3774 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3775 return MCDisassembler::Fail; 3776 } else 3777 Inst.addOperand(MCOperand::CreateReg(0)); 3778 } 3779 3780 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3781 return MCDisassembler::Fail; 3782 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3783 return MCDisassembler::Fail; 3784 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3785 return MCDisassembler::Fail; 3786 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 3787 return MCDisassembler::Fail; 3788 Inst.addOperand(MCOperand::CreateImm(index)); 3789 3790 return S; 3791 } 3792 3793 static DecodeStatus DecodeVST4LN(llvm::MCInst &Inst, unsigned Insn, 3794 uint64_t Address, const void *Decoder) { 3795 DecodeStatus S = MCDisassembler::Success; 3796 3797 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3798 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3799 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3800 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3801 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3802 3803 unsigned align = 0; 3804 unsigned index = 0; 3805 unsigned inc = 1; 3806 switch (size) { 3807 default: 3808 return MCDisassembler::Fail; 3809 case 0: 3810 if (fieldFromInstruction32(Insn, 4, 1)) 3811 align = 4; 3812 index = fieldFromInstruction32(Insn, 5, 3); 3813 break; 3814 case 1: 3815 if (fieldFromInstruction32(Insn, 4, 1)) 3816 align = 8; 3817 index = fieldFromInstruction32(Insn, 6, 2); 3818 if (fieldFromInstruction32(Insn, 5, 1)) 3819 inc = 2; 3820 break; 3821 case 2: 3822 if (fieldFromInstruction32(Insn, 4, 2)) 3823 align = 4 << fieldFromInstruction32(Insn, 4, 2); 3824 index = fieldFromInstruction32(Insn, 7, 1); 3825 if (fieldFromInstruction32(Insn, 6, 1)) 3826 inc = 2; 3827 break; 3828 } 3829 3830 if (Rm != 0xF) { // Writeback 3831 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3832 return MCDisassembler::Fail; 3833 } 3834 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3835 return MCDisassembler::Fail; 3836 Inst.addOperand(MCOperand::CreateImm(align)); 3837 if (Rm != 0xF) { 3838 if (Rm != 0xD) { 3839 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3840 return MCDisassembler::Fail; 3841 } else 3842 Inst.addOperand(MCOperand::CreateReg(0)); 3843 } 3844 3845 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3846 return MCDisassembler::Fail; 3847 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3848 return MCDisassembler::Fail; 3849 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3850 return MCDisassembler::Fail; 3851 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 3852 return MCDisassembler::Fail; 3853 Inst.addOperand(MCOperand::CreateImm(index)); 3854 3855 return S; 3856 } 3857 3858 static DecodeStatus DecodeVMOVSRR(llvm::MCInst &Inst, unsigned Insn, 3859 uint64_t Address, const void *Decoder) { 3860 DecodeStatus S = MCDisassembler::Success; 3861 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3862 unsigned Rt2 = fieldFromInstruction32(Insn, 16, 4); 3863 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3864 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3865 Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; 3866 3867 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) 3868 S = MCDisassembler::SoftFail; 3869 3870 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) 3871 return MCDisassembler::Fail; 3872 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) 3873 return MCDisassembler::Fail; 3874 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) 3875 return MCDisassembler::Fail; 3876 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) 3877 return MCDisassembler::Fail; 3878 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3879 return MCDisassembler::Fail; 3880 3881 return S; 3882 } 3883 3884 static DecodeStatus DecodeVMOVRRS(llvm::MCInst &Inst, unsigned Insn, 3885 uint64_t Address, const void *Decoder) { 3886 DecodeStatus S = MCDisassembler::Success; 3887 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3888 unsigned Rt2 = fieldFromInstruction32(Insn, 16, 4); 3889 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3890 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3891 Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; 3892 3893 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) 3894 S = MCDisassembler::SoftFail; 3895 3896 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) 3897 return MCDisassembler::Fail; 3898 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) 3899 return MCDisassembler::Fail; 3900 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) 3901 return MCDisassembler::Fail; 3902 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) 3903 return MCDisassembler::Fail; 3904 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3905 return MCDisassembler::Fail; 3906 3907 return S; 3908 } 3909 3910 static DecodeStatus DecodeIT(llvm::MCInst &Inst, unsigned Insn, 3911 uint64_t Address, const void *Decoder) { 3912 DecodeStatus S = MCDisassembler::Success; 3913 unsigned pred = fieldFromInstruction16(Insn, 4, 4); 3914 // The InstPrinter needs to have the low bit of the predicate in 3915 // the mask operand to be able to print it properly. 3916 unsigned mask = fieldFromInstruction16(Insn, 0, 5); 3917 3918 if (pred == 0xF) { 3919 pred = 0xE; 3920 S = MCDisassembler::SoftFail; 3921 } 3922 3923 if ((mask & 0xF) == 0) { 3924 // Preserve the high bit of the mask, which is the low bit of 3925 // the predicate. 3926 mask &= 0x10; 3927 mask |= 0x8; 3928 S = MCDisassembler::SoftFail; 3929 } 3930 3931 Inst.addOperand(MCOperand::CreateImm(pred)); 3932 Inst.addOperand(MCOperand::CreateImm(mask)); 3933 return S; 3934 } 3935 3936 static DecodeStatus 3937 DecodeT2LDRDPreInstruction(llvm::MCInst &Inst, unsigned Insn, 3938 uint64_t Address, const void *Decoder) { 3939 DecodeStatus S = MCDisassembler::Success; 3940 3941 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3942 unsigned Rt2 = fieldFromInstruction32(Insn, 8, 4); 3943 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3944 unsigned addr = fieldFromInstruction32(Insn, 0, 8); 3945 unsigned W = fieldFromInstruction32(Insn, 21, 1); 3946 unsigned U = fieldFromInstruction32(Insn, 23, 1); 3947 unsigned P = fieldFromInstruction32(Insn, 24, 1); 3948 bool writeback = (W == 1) | (P == 0); 3949 3950 addr |= (U << 8) | (Rn << 9); 3951 3952 if (writeback && (Rn == Rt || Rn == Rt2)) 3953 Check(S, MCDisassembler::SoftFail); 3954 if (Rt == Rt2) 3955 Check(S, MCDisassembler::SoftFail); 3956 3957 // Rt 3958 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 3959 return MCDisassembler::Fail; 3960 // Rt2 3961 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) 3962 return MCDisassembler::Fail; 3963 // Writeback operand 3964 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) 3965 return MCDisassembler::Fail; 3966 // addr 3967 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) 3968 return MCDisassembler::Fail; 3969 3970 return S; 3971 } 3972 3973 static DecodeStatus 3974 DecodeT2STRDPreInstruction(llvm::MCInst &Inst, unsigned Insn, 3975 uint64_t Address, const void *Decoder) { 3976 DecodeStatus S = MCDisassembler::Success; 3977 3978 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3979 unsigned Rt2 = fieldFromInstruction32(Insn, 8, 4); 3980 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3981 unsigned addr = fieldFromInstruction32(Insn, 0, 8); 3982 unsigned W = fieldFromInstruction32(Insn, 21, 1); 3983 unsigned U = fieldFromInstruction32(Insn, 23, 1); 3984 unsigned P = fieldFromInstruction32(Insn, 24, 1); 3985 bool writeback = (W == 1) | (P == 0); 3986 3987 addr |= (U << 8) | (Rn << 9); 3988 3989 if (writeback && (Rn == Rt || Rn == Rt2)) 3990 Check(S, MCDisassembler::SoftFail); 3991 3992 // Writeback operand 3993 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) 3994 return MCDisassembler::Fail; 3995 // Rt 3996 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 3997 return MCDisassembler::Fail; 3998 // Rt2 3999 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) 4000 return MCDisassembler::Fail; 4001 // addr 4002 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) 4003 return MCDisassembler::Fail; 4004 4005 return S; 4006 } 4007 4008 static DecodeStatus DecodeT2Adr(llvm::MCInst &Inst, uint32_t Insn, 4009 uint64_t Address, const void *Decoder) { 4010 unsigned sign1 = fieldFromInstruction32(Insn, 21, 1); 4011 unsigned sign2 = fieldFromInstruction32(Insn, 23, 1); 4012 if (sign1 != sign2) return MCDisassembler::Fail; 4013 4014 unsigned Val = fieldFromInstruction32(Insn, 0, 8); 4015 Val |= fieldFromInstruction32(Insn, 12, 3) << 8; 4016 Val |= fieldFromInstruction32(Insn, 26, 1) << 11; 4017 Val |= sign1 << 12; 4018 Inst.addOperand(MCOperand::CreateImm(SignExtend32<13>(Val))); 4019 4020 return MCDisassembler::Success; 4021 } 4022 4023 static DecodeStatus DecodeT2ShifterImmOperand(llvm::MCInst &Inst, uint32_t Val, 4024 uint64_t Address, 4025 const void *Decoder) { 4026 DecodeStatus S = MCDisassembler::Success; 4027 4028 // Shift of "asr #32" is not allowed in Thumb2 mode. 4029 if (Val == 0x20) S = MCDisassembler::SoftFail; 4030 Inst.addOperand(MCOperand::CreateImm(Val)); 4031 return S; 4032 } 4033 4034