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 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 unsigned P = fieldFromInstruction32(Insn, 24, 1); 1238 unsigned W = fieldFromInstruction32(Insn, 21, 1); 1239 1240 bool writeback = (P == 0) || (W == 1); 1241 unsigned idx_mode = 0; 1242 if (P && writeback) 1243 idx_mode = ARMII::IndexModePre; 1244 else if (!P && writeback) 1245 idx_mode = ARMII::IndexModePost; 1246 1247 switch (Inst.getOpcode()) { 1248 case ARM::t2LDC2_OFFSET: 1249 case ARM::t2LDC2L_OFFSET: 1250 case ARM::t2LDC2_PRE: 1251 case ARM::t2LDC2L_PRE: 1252 case ARM::t2STC2_OFFSET: 1253 case ARM::t2STC2L_OFFSET: 1254 case ARM::t2STC2_PRE: 1255 case ARM::t2STC2L_PRE: 1256 case ARM::LDC2_OFFSET: 1257 case ARM::LDC2L_OFFSET: 1258 case ARM::LDC2_PRE: 1259 case ARM::LDC2L_PRE: 1260 case ARM::STC2_OFFSET: 1261 case ARM::STC2L_OFFSET: 1262 case ARM::STC2_PRE: 1263 case ARM::STC2L_PRE: 1264 case ARM::t2LDC_OFFSET: 1265 case ARM::t2LDCL_OFFSET: 1266 case ARM::t2LDC_PRE: 1267 case ARM::t2LDCL_PRE: 1268 case ARM::t2STC_OFFSET: 1269 case ARM::t2STCL_OFFSET: 1270 case ARM::t2STC_PRE: 1271 case ARM::t2STCL_PRE: 1272 case ARM::LDC_OFFSET: 1273 case ARM::LDCL_OFFSET: 1274 case ARM::LDC_PRE: 1275 case ARM::LDCL_PRE: 1276 case ARM::STC_OFFSET: 1277 case ARM::STCL_OFFSET: 1278 case ARM::STC_PRE: 1279 case ARM::STCL_PRE: 1280 imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm); 1281 Inst.addOperand(MCOperand::CreateImm(imm)); 1282 break; 1283 case ARM::t2LDC2_POST: 1284 case ARM::t2LDC2L_POST: 1285 case ARM::t2STC2_POST: 1286 case ARM::t2STC2L_POST: 1287 case ARM::LDC2_POST: 1288 case ARM::LDC2L_POST: 1289 case ARM::STC2_POST: 1290 case ARM::STC2L_POST: 1291 case ARM::t2LDC_POST: 1292 case ARM::t2LDCL_POST: 1293 case ARM::t2STC_POST: 1294 case ARM::t2STCL_POST: 1295 case ARM::LDC_POST: 1296 case ARM::LDCL_POST: 1297 case ARM::STC_POST: 1298 case ARM::STCL_POST: 1299 imm |= U << 8; 1300 // fall through. 1301 default: 1302 // The 'option' variant doesn't encode 'U' in the immediate since 1303 // the immediate is unsigned [0,255]. 1304 Inst.addOperand(MCOperand::CreateImm(imm)); 1305 break; 1306 } 1307 1308 switch (Inst.getOpcode()) { 1309 case ARM::LDC_OFFSET: 1310 case ARM::LDC_PRE: 1311 case ARM::LDC_POST: 1312 case ARM::LDC_OPTION: 1313 case ARM::LDCL_OFFSET: 1314 case ARM::LDCL_PRE: 1315 case ARM::LDCL_POST: 1316 case ARM::LDCL_OPTION: 1317 case ARM::STC_OFFSET: 1318 case ARM::STC_PRE: 1319 case ARM::STC_POST: 1320 case ARM::STC_OPTION: 1321 case ARM::STCL_OFFSET: 1322 case ARM::STCL_PRE: 1323 case ARM::STCL_POST: 1324 case ARM::STCL_OPTION: 1325 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1326 return MCDisassembler::Fail; 1327 break; 1328 default: 1329 break; 1330 } 1331 1332 return S; 1333 } 1334 1335 static DecodeStatus 1336 DecodeAddrMode2IdxInstruction(llvm::MCInst &Inst, unsigned Insn, 1337 uint64_t Address, const void *Decoder) { 1338 DecodeStatus S = MCDisassembler::Success; 1339 1340 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1341 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 1342 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 1343 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 1344 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1345 unsigned reg = fieldFromInstruction32(Insn, 25, 1); 1346 unsigned P = fieldFromInstruction32(Insn, 24, 1); 1347 unsigned W = fieldFromInstruction32(Insn, 21, 1); 1348 1349 // On stores, the writeback operand precedes Rt. 1350 switch (Inst.getOpcode()) { 1351 case ARM::STR_POST_IMM: 1352 case ARM::STR_POST_REG: 1353 case ARM::STRB_POST_IMM: 1354 case ARM::STRB_POST_REG: 1355 case ARM::STRT_POST_REG: 1356 case ARM::STRT_POST_IMM: 1357 case ARM::STRBT_POST_REG: 1358 case ARM::STRBT_POST_IMM: 1359 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1360 return MCDisassembler::Fail; 1361 break; 1362 default: 1363 break; 1364 } 1365 1366 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 1367 return MCDisassembler::Fail; 1368 1369 // On loads, the writeback operand comes after Rt. 1370 switch (Inst.getOpcode()) { 1371 case ARM::LDR_POST_IMM: 1372 case ARM::LDR_POST_REG: 1373 case ARM::LDRB_POST_IMM: 1374 case ARM::LDRB_POST_REG: 1375 case ARM::LDRBT_POST_REG: 1376 case ARM::LDRBT_POST_IMM: 1377 case ARM::LDRT_POST_REG: 1378 case ARM::LDRT_POST_IMM: 1379 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1380 return MCDisassembler::Fail; 1381 break; 1382 default: 1383 break; 1384 } 1385 1386 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1387 return MCDisassembler::Fail; 1388 1389 ARM_AM::AddrOpc Op = ARM_AM::add; 1390 if (!fieldFromInstruction32(Insn, 23, 1)) 1391 Op = ARM_AM::sub; 1392 1393 bool writeback = (P == 0) || (W == 1); 1394 unsigned idx_mode = 0; 1395 if (P && writeback) 1396 idx_mode = ARMII::IndexModePre; 1397 else if (!P && writeback) 1398 idx_mode = ARMII::IndexModePost; 1399 1400 if (writeback && (Rn == 15 || Rn == Rt)) 1401 S = MCDisassembler::SoftFail; // UNPREDICTABLE 1402 1403 if (reg) { 1404 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1405 return MCDisassembler::Fail; 1406 ARM_AM::ShiftOpc Opc = ARM_AM::lsl; 1407 switch( fieldFromInstruction32(Insn, 5, 2)) { 1408 case 0: 1409 Opc = ARM_AM::lsl; 1410 break; 1411 case 1: 1412 Opc = ARM_AM::lsr; 1413 break; 1414 case 2: 1415 Opc = ARM_AM::asr; 1416 break; 1417 case 3: 1418 Opc = ARM_AM::ror; 1419 break; 1420 default: 1421 return MCDisassembler::Fail; 1422 } 1423 unsigned amt = fieldFromInstruction32(Insn, 7, 5); 1424 unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode); 1425 1426 Inst.addOperand(MCOperand::CreateImm(imm)); 1427 } else { 1428 Inst.addOperand(MCOperand::CreateReg(0)); 1429 unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode); 1430 Inst.addOperand(MCOperand::CreateImm(tmp)); 1431 } 1432 1433 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1434 return MCDisassembler::Fail; 1435 1436 return S; 1437 } 1438 1439 static DecodeStatus DecodeSORegMemOperand(llvm::MCInst &Inst, unsigned Val, 1440 uint64_t Address, const void *Decoder) { 1441 DecodeStatus S = MCDisassembler::Success; 1442 1443 unsigned Rn = fieldFromInstruction32(Val, 13, 4); 1444 unsigned Rm = fieldFromInstruction32(Val, 0, 4); 1445 unsigned type = fieldFromInstruction32(Val, 5, 2); 1446 unsigned imm = fieldFromInstruction32(Val, 7, 5); 1447 unsigned U = fieldFromInstruction32(Val, 12, 1); 1448 1449 ARM_AM::ShiftOpc ShOp = ARM_AM::lsl; 1450 switch (type) { 1451 case 0: 1452 ShOp = ARM_AM::lsl; 1453 break; 1454 case 1: 1455 ShOp = ARM_AM::lsr; 1456 break; 1457 case 2: 1458 ShOp = ARM_AM::asr; 1459 break; 1460 case 3: 1461 ShOp = ARM_AM::ror; 1462 break; 1463 } 1464 1465 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1466 return MCDisassembler::Fail; 1467 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1468 return MCDisassembler::Fail; 1469 unsigned shift; 1470 if (U) 1471 shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp); 1472 else 1473 shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp); 1474 Inst.addOperand(MCOperand::CreateImm(shift)); 1475 1476 return S; 1477 } 1478 1479 static DecodeStatus 1480 DecodeAddrMode3Instruction(llvm::MCInst &Inst, unsigned Insn, 1481 uint64_t Address, const void *Decoder) { 1482 DecodeStatus S = MCDisassembler::Success; 1483 1484 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 1485 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1486 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 1487 unsigned type = fieldFromInstruction32(Insn, 22, 1); 1488 unsigned imm = fieldFromInstruction32(Insn, 8, 4); 1489 unsigned U = ((~fieldFromInstruction32(Insn, 23, 1)) & 1) << 8; 1490 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1491 unsigned W = fieldFromInstruction32(Insn, 21, 1); 1492 unsigned P = fieldFromInstruction32(Insn, 24, 1); 1493 1494 bool writeback = (W == 1) | (P == 0); 1495 1496 // For {LD,ST}RD, Rt must be even, else undefined. 1497 switch (Inst.getOpcode()) { 1498 case ARM::STRD: 1499 case ARM::STRD_PRE: 1500 case ARM::STRD_POST: 1501 case ARM::LDRD: 1502 case ARM::LDRD_PRE: 1503 case ARM::LDRD_POST: 1504 if (Rt & 0x1) return MCDisassembler::Fail; 1505 break; 1506 default: 1507 break; 1508 } 1509 1510 if (writeback) { // Writeback 1511 if (P) 1512 U |= ARMII::IndexModePre << 9; 1513 else 1514 U |= ARMII::IndexModePost << 9; 1515 1516 // On stores, the writeback operand precedes Rt. 1517 switch (Inst.getOpcode()) { 1518 case ARM::STRD: 1519 case ARM::STRD_PRE: 1520 case ARM::STRD_POST: 1521 case ARM::STRH: 1522 case ARM::STRH_PRE: 1523 case ARM::STRH_POST: 1524 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1525 return MCDisassembler::Fail; 1526 break; 1527 default: 1528 break; 1529 } 1530 } 1531 1532 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 1533 return MCDisassembler::Fail; 1534 switch (Inst.getOpcode()) { 1535 case ARM::STRD: 1536 case ARM::STRD_PRE: 1537 case ARM::STRD_POST: 1538 case ARM::LDRD: 1539 case ARM::LDRD_PRE: 1540 case ARM::LDRD_POST: 1541 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 1542 return MCDisassembler::Fail; 1543 break; 1544 default: 1545 break; 1546 } 1547 1548 if (writeback) { 1549 // On loads, the writeback operand comes after Rt. 1550 switch (Inst.getOpcode()) { 1551 case ARM::LDRD: 1552 case ARM::LDRD_PRE: 1553 case ARM::LDRD_POST: 1554 case ARM::LDRH: 1555 case ARM::LDRH_PRE: 1556 case ARM::LDRH_POST: 1557 case ARM::LDRSH: 1558 case ARM::LDRSH_PRE: 1559 case ARM::LDRSH_POST: 1560 case ARM::LDRSB: 1561 case ARM::LDRSB_PRE: 1562 case ARM::LDRSB_POST: 1563 case ARM::LDRHTr: 1564 case ARM::LDRSBTr: 1565 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1566 return MCDisassembler::Fail; 1567 break; 1568 default: 1569 break; 1570 } 1571 } 1572 1573 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1574 return MCDisassembler::Fail; 1575 1576 if (type) { 1577 Inst.addOperand(MCOperand::CreateReg(0)); 1578 Inst.addOperand(MCOperand::CreateImm(U | (imm << 4) | Rm)); 1579 } else { 1580 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1581 return MCDisassembler::Fail; 1582 Inst.addOperand(MCOperand::CreateImm(U)); 1583 } 1584 1585 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1586 return MCDisassembler::Fail; 1587 1588 return S; 1589 } 1590 1591 static DecodeStatus DecodeRFEInstruction(llvm::MCInst &Inst, unsigned Insn, 1592 uint64_t Address, const void *Decoder) { 1593 DecodeStatus S = MCDisassembler::Success; 1594 1595 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1596 unsigned mode = fieldFromInstruction32(Insn, 23, 2); 1597 1598 switch (mode) { 1599 case 0: 1600 mode = ARM_AM::da; 1601 break; 1602 case 1: 1603 mode = ARM_AM::ia; 1604 break; 1605 case 2: 1606 mode = ARM_AM::db; 1607 break; 1608 case 3: 1609 mode = ARM_AM::ib; 1610 break; 1611 } 1612 1613 Inst.addOperand(MCOperand::CreateImm(mode)); 1614 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1615 return MCDisassembler::Fail; 1616 1617 return S; 1618 } 1619 1620 static DecodeStatus DecodeMemMultipleWritebackInstruction(llvm::MCInst &Inst, 1621 unsigned Insn, 1622 uint64_t Address, const void *Decoder) { 1623 DecodeStatus S = MCDisassembler::Success; 1624 1625 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1626 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1627 unsigned reglist = fieldFromInstruction32(Insn, 0, 16); 1628 1629 if (pred == 0xF) { 1630 switch (Inst.getOpcode()) { 1631 case ARM::LDMDA: 1632 Inst.setOpcode(ARM::RFEDA); 1633 break; 1634 case ARM::LDMDA_UPD: 1635 Inst.setOpcode(ARM::RFEDA_UPD); 1636 break; 1637 case ARM::LDMDB: 1638 Inst.setOpcode(ARM::RFEDB); 1639 break; 1640 case ARM::LDMDB_UPD: 1641 Inst.setOpcode(ARM::RFEDB_UPD); 1642 break; 1643 case ARM::LDMIA: 1644 Inst.setOpcode(ARM::RFEIA); 1645 break; 1646 case ARM::LDMIA_UPD: 1647 Inst.setOpcode(ARM::RFEIA_UPD); 1648 break; 1649 case ARM::LDMIB: 1650 Inst.setOpcode(ARM::RFEIB); 1651 break; 1652 case ARM::LDMIB_UPD: 1653 Inst.setOpcode(ARM::RFEIB_UPD); 1654 break; 1655 case ARM::STMDA: 1656 Inst.setOpcode(ARM::SRSDA); 1657 break; 1658 case ARM::STMDA_UPD: 1659 Inst.setOpcode(ARM::SRSDA_UPD); 1660 break; 1661 case ARM::STMDB: 1662 Inst.setOpcode(ARM::SRSDB); 1663 break; 1664 case ARM::STMDB_UPD: 1665 Inst.setOpcode(ARM::SRSDB_UPD); 1666 break; 1667 case ARM::STMIA: 1668 Inst.setOpcode(ARM::SRSIA); 1669 break; 1670 case ARM::STMIA_UPD: 1671 Inst.setOpcode(ARM::SRSIA_UPD); 1672 break; 1673 case ARM::STMIB: 1674 Inst.setOpcode(ARM::SRSIB); 1675 break; 1676 case ARM::STMIB_UPD: 1677 Inst.setOpcode(ARM::SRSIB_UPD); 1678 break; 1679 default: 1680 if (!Check(S, MCDisassembler::Fail)) return MCDisassembler::Fail; 1681 } 1682 1683 // For stores (which become SRS's, the only operand is the mode. 1684 if (fieldFromInstruction32(Insn, 20, 1) == 0) { 1685 Inst.addOperand( 1686 MCOperand::CreateImm(fieldFromInstruction32(Insn, 0, 4))); 1687 return S; 1688 } 1689 1690 return DecodeRFEInstruction(Inst, Insn, Address, Decoder); 1691 } 1692 1693 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1694 return MCDisassembler::Fail; 1695 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1696 return MCDisassembler::Fail; // Tied 1697 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1698 return MCDisassembler::Fail; 1699 if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder))) 1700 return MCDisassembler::Fail; 1701 1702 return S; 1703 } 1704 1705 static DecodeStatus DecodeCPSInstruction(llvm::MCInst &Inst, unsigned Insn, 1706 uint64_t Address, const void *Decoder) { 1707 unsigned imod = fieldFromInstruction32(Insn, 18, 2); 1708 unsigned M = fieldFromInstruction32(Insn, 17, 1); 1709 unsigned iflags = fieldFromInstruction32(Insn, 6, 3); 1710 unsigned mode = fieldFromInstruction32(Insn, 0, 5); 1711 1712 DecodeStatus S = MCDisassembler::Success; 1713 1714 // imod == '01' --> UNPREDICTABLE 1715 // NOTE: Even though this is technically UNPREDICTABLE, we choose to 1716 // return failure here. The '01' imod value is unprintable, so there's 1717 // nothing useful we could do even if we returned UNPREDICTABLE. 1718 1719 if (imod == 1) return MCDisassembler::Fail; 1720 1721 if (imod && M) { 1722 Inst.setOpcode(ARM::CPS3p); 1723 Inst.addOperand(MCOperand::CreateImm(imod)); 1724 Inst.addOperand(MCOperand::CreateImm(iflags)); 1725 Inst.addOperand(MCOperand::CreateImm(mode)); 1726 } else if (imod && !M) { 1727 Inst.setOpcode(ARM::CPS2p); 1728 Inst.addOperand(MCOperand::CreateImm(imod)); 1729 Inst.addOperand(MCOperand::CreateImm(iflags)); 1730 if (mode) S = MCDisassembler::SoftFail; 1731 } else if (!imod && M) { 1732 Inst.setOpcode(ARM::CPS1p); 1733 Inst.addOperand(MCOperand::CreateImm(mode)); 1734 if (iflags) S = MCDisassembler::SoftFail; 1735 } else { 1736 // imod == '00' && M == '0' --> UNPREDICTABLE 1737 Inst.setOpcode(ARM::CPS1p); 1738 Inst.addOperand(MCOperand::CreateImm(mode)); 1739 S = MCDisassembler::SoftFail; 1740 } 1741 1742 return S; 1743 } 1744 1745 static DecodeStatus DecodeT2CPSInstruction(llvm::MCInst &Inst, unsigned Insn, 1746 uint64_t Address, const void *Decoder) { 1747 unsigned imod = fieldFromInstruction32(Insn, 9, 2); 1748 unsigned M = fieldFromInstruction32(Insn, 8, 1); 1749 unsigned iflags = fieldFromInstruction32(Insn, 5, 3); 1750 unsigned mode = fieldFromInstruction32(Insn, 0, 5); 1751 1752 DecodeStatus S = MCDisassembler::Success; 1753 1754 // imod == '01' --> UNPREDICTABLE 1755 // NOTE: Even though this is technically UNPREDICTABLE, we choose to 1756 // return failure here. The '01' imod value is unprintable, so there's 1757 // nothing useful we could do even if we returned UNPREDICTABLE. 1758 1759 if (imod == 1) return MCDisassembler::Fail; 1760 1761 if (imod && M) { 1762 Inst.setOpcode(ARM::t2CPS3p); 1763 Inst.addOperand(MCOperand::CreateImm(imod)); 1764 Inst.addOperand(MCOperand::CreateImm(iflags)); 1765 Inst.addOperand(MCOperand::CreateImm(mode)); 1766 } else if (imod && !M) { 1767 Inst.setOpcode(ARM::t2CPS2p); 1768 Inst.addOperand(MCOperand::CreateImm(imod)); 1769 Inst.addOperand(MCOperand::CreateImm(iflags)); 1770 if (mode) S = MCDisassembler::SoftFail; 1771 } else if (!imod && M) { 1772 Inst.setOpcode(ARM::t2CPS1p); 1773 Inst.addOperand(MCOperand::CreateImm(mode)); 1774 if (iflags) S = MCDisassembler::SoftFail; 1775 } else { 1776 // imod == '00' && M == '0' --> UNPREDICTABLE 1777 Inst.setOpcode(ARM::t2CPS1p); 1778 Inst.addOperand(MCOperand::CreateImm(mode)); 1779 S = MCDisassembler::SoftFail; 1780 } 1781 1782 return S; 1783 } 1784 1785 static DecodeStatus DecodeT2MOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, 1786 uint64_t Address, const void *Decoder) { 1787 DecodeStatus S = MCDisassembler::Success; 1788 1789 unsigned Rd = fieldFromInstruction32(Insn, 8, 4); 1790 unsigned imm = 0; 1791 1792 imm |= (fieldFromInstruction32(Insn, 0, 8) << 0); 1793 imm |= (fieldFromInstruction32(Insn, 12, 3) << 8); 1794 imm |= (fieldFromInstruction32(Insn, 16, 4) << 12); 1795 imm |= (fieldFromInstruction32(Insn, 26, 1) << 11); 1796 1797 if (Inst.getOpcode() == ARM::t2MOVTi16) 1798 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1799 return MCDisassembler::Fail; 1800 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1801 return MCDisassembler::Fail; 1802 1803 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) 1804 Inst.addOperand(MCOperand::CreateImm(imm)); 1805 1806 return S; 1807 } 1808 1809 static DecodeStatus DecodeArmMOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, 1810 uint64_t Address, const void *Decoder) { 1811 DecodeStatus S = MCDisassembler::Success; 1812 1813 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 1814 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1815 unsigned imm = 0; 1816 1817 imm |= (fieldFromInstruction32(Insn, 0, 12) << 0); 1818 imm |= (fieldFromInstruction32(Insn, 16, 4) << 12); 1819 1820 if (Inst.getOpcode() == ARM::MOVTi16) 1821 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1822 return MCDisassembler::Fail; 1823 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1824 return MCDisassembler::Fail; 1825 1826 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) 1827 Inst.addOperand(MCOperand::CreateImm(imm)); 1828 1829 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1830 return MCDisassembler::Fail; 1831 1832 return S; 1833 } 1834 1835 static DecodeStatus DecodeSMLAInstruction(llvm::MCInst &Inst, unsigned Insn, 1836 uint64_t Address, const void *Decoder) { 1837 DecodeStatus S = MCDisassembler::Success; 1838 1839 unsigned Rd = fieldFromInstruction32(Insn, 16, 4); 1840 unsigned Rn = fieldFromInstruction32(Insn, 0, 4); 1841 unsigned Rm = fieldFromInstruction32(Insn, 8, 4); 1842 unsigned Ra = fieldFromInstruction32(Insn, 12, 4); 1843 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1844 1845 if (pred == 0xF) 1846 return DecodeCPSInstruction(Inst, Insn, Address, Decoder); 1847 1848 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) 1849 return MCDisassembler::Fail; 1850 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 1851 return MCDisassembler::Fail; 1852 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1853 return MCDisassembler::Fail; 1854 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder))) 1855 return MCDisassembler::Fail; 1856 1857 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1858 return MCDisassembler::Fail; 1859 1860 return S; 1861 } 1862 1863 static DecodeStatus DecodeAddrModeImm12Operand(llvm::MCInst &Inst, unsigned Val, 1864 uint64_t Address, const void *Decoder) { 1865 DecodeStatus S = MCDisassembler::Success; 1866 1867 unsigned add = fieldFromInstruction32(Val, 12, 1); 1868 unsigned imm = fieldFromInstruction32(Val, 0, 12); 1869 unsigned Rn = fieldFromInstruction32(Val, 13, 4); 1870 1871 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1872 return MCDisassembler::Fail; 1873 1874 if (!add) imm *= -1; 1875 if (imm == 0 && !add) imm = INT32_MIN; 1876 Inst.addOperand(MCOperand::CreateImm(imm)); 1877 if (Rn == 15) 1878 tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder); 1879 1880 return S; 1881 } 1882 1883 static DecodeStatus DecodeAddrMode5Operand(llvm::MCInst &Inst, unsigned Val, 1884 uint64_t Address, const void *Decoder) { 1885 DecodeStatus S = MCDisassembler::Success; 1886 1887 unsigned Rn = fieldFromInstruction32(Val, 9, 4); 1888 unsigned U = fieldFromInstruction32(Val, 8, 1); 1889 unsigned imm = fieldFromInstruction32(Val, 0, 8); 1890 1891 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1892 return MCDisassembler::Fail; 1893 1894 if (U) 1895 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add, imm))); 1896 else 1897 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm))); 1898 1899 return S; 1900 } 1901 1902 static DecodeStatus DecodeAddrMode7Operand(llvm::MCInst &Inst, unsigned Val, 1903 uint64_t Address, const void *Decoder) { 1904 return DecodeGPRRegisterClass(Inst, Val, Address, Decoder); 1905 } 1906 1907 static DecodeStatus 1908 DecodeBranchImmInstruction(llvm::MCInst &Inst, unsigned Insn, 1909 uint64_t Address, const void *Decoder) { 1910 DecodeStatus S = MCDisassembler::Success; 1911 1912 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 1913 unsigned imm = fieldFromInstruction32(Insn, 0, 24) << 2; 1914 1915 if (pred == 0xF) { 1916 Inst.setOpcode(ARM::BLXi); 1917 imm |= fieldFromInstruction32(Insn, 24, 1) << 1; 1918 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm))); 1919 return S; 1920 } 1921 1922 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8, true, 1923 4, Inst, Decoder)) 1924 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm))); 1925 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1926 return MCDisassembler::Fail; 1927 1928 return S; 1929 } 1930 1931 1932 static DecodeStatus DecodeVCVTImmOperand(llvm::MCInst &Inst, unsigned Val, 1933 uint64_t Address, const void *Decoder) { 1934 Inst.addOperand(MCOperand::CreateImm(64 - Val)); 1935 return MCDisassembler::Success; 1936 } 1937 1938 static DecodeStatus DecodeAddrMode6Operand(llvm::MCInst &Inst, unsigned Val, 1939 uint64_t Address, const void *Decoder) { 1940 DecodeStatus S = MCDisassembler::Success; 1941 1942 unsigned Rm = fieldFromInstruction32(Val, 0, 4); 1943 unsigned align = fieldFromInstruction32(Val, 4, 2); 1944 1945 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1946 return MCDisassembler::Fail; 1947 if (!align) 1948 Inst.addOperand(MCOperand::CreateImm(0)); 1949 else 1950 Inst.addOperand(MCOperand::CreateImm(4 << align)); 1951 1952 return S; 1953 } 1954 1955 static DecodeStatus DecodeVLDInstruction(llvm::MCInst &Inst, unsigned Insn, 1956 uint64_t Address, const void *Decoder) { 1957 DecodeStatus S = MCDisassembler::Success; 1958 1959 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 1960 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 1961 unsigned wb = fieldFromInstruction32(Insn, 16, 4); 1962 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 1963 Rn |= fieldFromInstruction32(Insn, 4, 2) << 4; 1964 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 1965 1966 // First output register 1967 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 1968 return MCDisassembler::Fail; 1969 1970 // Second output register 1971 switch (Inst.getOpcode()) { 1972 case ARM::VLD1q8: 1973 case ARM::VLD1q16: 1974 case ARM::VLD1q32: 1975 case ARM::VLD1q64: 1976 case ARM::VLD1q8_UPD: 1977 case ARM::VLD1q16_UPD: 1978 case ARM::VLD1q32_UPD: 1979 case ARM::VLD1q64_UPD: 1980 case ARM::VLD1d8T: 1981 case ARM::VLD1d16T: 1982 case ARM::VLD1d32T: 1983 case ARM::VLD1d64T: 1984 case ARM::VLD1d8T_UPD: 1985 case ARM::VLD1d16T_UPD: 1986 case ARM::VLD1d32T_UPD: 1987 case ARM::VLD1d64T_UPD: 1988 case ARM::VLD1d8Q: 1989 case ARM::VLD1d16Q: 1990 case ARM::VLD1d32Q: 1991 case ARM::VLD1d64Q: 1992 case ARM::VLD1d8Q_UPD: 1993 case ARM::VLD1d16Q_UPD: 1994 case ARM::VLD1d32Q_UPD: 1995 case ARM::VLD1d64Q_UPD: 1996 case ARM::VLD2d8: 1997 case ARM::VLD2d16: 1998 case ARM::VLD2d32: 1999 case ARM::VLD2d8_UPD: 2000 case ARM::VLD2d16_UPD: 2001 case ARM::VLD2d32_UPD: 2002 case ARM::VLD2q8: 2003 case ARM::VLD2q16: 2004 case ARM::VLD2q32: 2005 case ARM::VLD2q8_UPD: 2006 case ARM::VLD2q16_UPD: 2007 case ARM::VLD2q32_UPD: 2008 case ARM::VLD3d8: 2009 case ARM::VLD3d16: 2010 case ARM::VLD3d32: 2011 case ARM::VLD3d8_UPD: 2012 case ARM::VLD3d16_UPD: 2013 case ARM::VLD3d32_UPD: 2014 case ARM::VLD4d8: 2015 case ARM::VLD4d16: 2016 case ARM::VLD4d32: 2017 case ARM::VLD4d8_UPD: 2018 case ARM::VLD4d16_UPD: 2019 case ARM::VLD4d32_UPD: 2020 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 2021 return MCDisassembler::Fail; 2022 break; 2023 case ARM::VLD2b8: 2024 case ARM::VLD2b16: 2025 case ARM::VLD2b32: 2026 case ARM::VLD2b8_UPD: 2027 case ARM::VLD2b16_UPD: 2028 case ARM::VLD2b32_UPD: 2029 case ARM::VLD3q8: 2030 case ARM::VLD3q16: 2031 case ARM::VLD3q32: 2032 case ARM::VLD3q8_UPD: 2033 case ARM::VLD3q16_UPD: 2034 case ARM::VLD3q32_UPD: 2035 case ARM::VLD4q8: 2036 case ARM::VLD4q16: 2037 case ARM::VLD4q32: 2038 case ARM::VLD4q8_UPD: 2039 case ARM::VLD4q16_UPD: 2040 case ARM::VLD4q32_UPD: 2041 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2042 return MCDisassembler::Fail; 2043 default: 2044 break; 2045 } 2046 2047 // Third output register 2048 switch(Inst.getOpcode()) { 2049 case ARM::VLD1d8T: 2050 case ARM::VLD1d16T: 2051 case ARM::VLD1d32T: 2052 case ARM::VLD1d64T: 2053 case ARM::VLD1d8T_UPD: 2054 case ARM::VLD1d16T_UPD: 2055 case ARM::VLD1d32T_UPD: 2056 case ARM::VLD1d64T_UPD: 2057 case ARM::VLD1d8Q: 2058 case ARM::VLD1d16Q: 2059 case ARM::VLD1d32Q: 2060 case ARM::VLD1d64Q: 2061 case ARM::VLD1d8Q_UPD: 2062 case ARM::VLD1d16Q_UPD: 2063 case ARM::VLD1d32Q_UPD: 2064 case ARM::VLD1d64Q_UPD: 2065 case ARM::VLD2q8: 2066 case ARM::VLD2q16: 2067 case ARM::VLD2q32: 2068 case ARM::VLD2q8_UPD: 2069 case ARM::VLD2q16_UPD: 2070 case ARM::VLD2q32_UPD: 2071 case ARM::VLD3d8: 2072 case ARM::VLD3d16: 2073 case ARM::VLD3d32: 2074 case ARM::VLD3d8_UPD: 2075 case ARM::VLD3d16_UPD: 2076 case ARM::VLD3d32_UPD: 2077 case ARM::VLD4d8: 2078 case ARM::VLD4d16: 2079 case ARM::VLD4d32: 2080 case ARM::VLD4d8_UPD: 2081 case ARM::VLD4d16_UPD: 2082 case ARM::VLD4d32_UPD: 2083 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2084 return MCDisassembler::Fail; 2085 break; 2086 case ARM::VLD3q8: 2087 case ARM::VLD3q16: 2088 case ARM::VLD3q32: 2089 case ARM::VLD3q8_UPD: 2090 case ARM::VLD3q16_UPD: 2091 case ARM::VLD3q32_UPD: 2092 case ARM::VLD4q8: 2093 case ARM::VLD4q16: 2094 case ARM::VLD4q32: 2095 case ARM::VLD4q8_UPD: 2096 case ARM::VLD4q16_UPD: 2097 case ARM::VLD4q32_UPD: 2098 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) 2099 return MCDisassembler::Fail; 2100 break; 2101 default: 2102 break; 2103 } 2104 2105 // Fourth output register 2106 switch (Inst.getOpcode()) { 2107 case ARM::VLD1d8Q: 2108 case ARM::VLD1d16Q: 2109 case ARM::VLD1d32Q: 2110 case ARM::VLD1d64Q: 2111 case ARM::VLD1d8Q_UPD: 2112 case ARM::VLD1d16Q_UPD: 2113 case ARM::VLD1d32Q_UPD: 2114 case ARM::VLD1d64Q_UPD: 2115 case ARM::VLD2q8: 2116 case ARM::VLD2q16: 2117 case ARM::VLD2q32: 2118 case ARM::VLD2q8_UPD: 2119 case ARM::VLD2q16_UPD: 2120 case ARM::VLD2q32_UPD: 2121 case ARM::VLD4d8: 2122 case ARM::VLD4d16: 2123 case ARM::VLD4d32: 2124 case ARM::VLD4d8_UPD: 2125 case ARM::VLD4d16_UPD: 2126 case ARM::VLD4d32_UPD: 2127 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) 2128 return MCDisassembler::Fail; 2129 break; 2130 case ARM::VLD4q8: 2131 case ARM::VLD4q16: 2132 case ARM::VLD4q32: 2133 case ARM::VLD4q8_UPD: 2134 case ARM::VLD4q16_UPD: 2135 case ARM::VLD4q32_UPD: 2136 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) 2137 return MCDisassembler::Fail; 2138 break; 2139 default: 2140 break; 2141 } 2142 2143 // Writeback operand 2144 switch (Inst.getOpcode()) { 2145 case ARM::VLD1d8_UPD: 2146 case ARM::VLD1d16_UPD: 2147 case ARM::VLD1d32_UPD: 2148 case ARM::VLD1d64_UPD: 2149 case ARM::VLD1q8_UPD: 2150 case ARM::VLD1q16_UPD: 2151 case ARM::VLD1q32_UPD: 2152 case ARM::VLD1q64_UPD: 2153 case ARM::VLD1d8T_UPD: 2154 case ARM::VLD1d16T_UPD: 2155 case ARM::VLD1d32T_UPD: 2156 case ARM::VLD1d64T_UPD: 2157 case ARM::VLD1d8Q_UPD: 2158 case ARM::VLD1d16Q_UPD: 2159 case ARM::VLD1d32Q_UPD: 2160 case ARM::VLD1d64Q_UPD: 2161 case ARM::VLD2d8_UPD: 2162 case ARM::VLD2d16_UPD: 2163 case ARM::VLD2d32_UPD: 2164 case ARM::VLD2q8_UPD: 2165 case ARM::VLD2q16_UPD: 2166 case ARM::VLD2q32_UPD: 2167 case ARM::VLD2b8_UPD: 2168 case ARM::VLD2b16_UPD: 2169 case ARM::VLD2b32_UPD: 2170 case ARM::VLD3d8_UPD: 2171 case ARM::VLD3d16_UPD: 2172 case ARM::VLD3d32_UPD: 2173 case ARM::VLD3q8_UPD: 2174 case ARM::VLD3q16_UPD: 2175 case ARM::VLD3q32_UPD: 2176 case ARM::VLD4d8_UPD: 2177 case ARM::VLD4d16_UPD: 2178 case ARM::VLD4d32_UPD: 2179 case ARM::VLD4q8_UPD: 2180 case ARM::VLD4q16_UPD: 2181 case ARM::VLD4q32_UPD: 2182 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) 2183 return MCDisassembler::Fail; 2184 break; 2185 default: 2186 break; 2187 } 2188 2189 // AddrMode6 Base (register+alignment) 2190 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) 2191 return MCDisassembler::Fail; 2192 2193 // AddrMode6 Offset (register) 2194 if (Rm == 0xD) 2195 Inst.addOperand(MCOperand::CreateReg(0)); 2196 else if (Rm != 0xF) { 2197 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2198 return MCDisassembler::Fail; 2199 } 2200 2201 return S; 2202 } 2203 2204 static DecodeStatus DecodeVSTInstruction(llvm::MCInst &Inst, unsigned Insn, 2205 uint64_t Address, const void *Decoder) { 2206 DecodeStatus S = MCDisassembler::Success; 2207 2208 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2209 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2210 unsigned wb = fieldFromInstruction32(Insn, 16, 4); 2211 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2212 Rn |= fieldFromInstruction32(Insn, 4, 2) << 4; 2213 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2214 2215 // Writeback Operand 2216 switch (Inst.getOpcode()) { 2217 case ARM::VST1d8_UPD: 2218 case ARM::VST1d16_UPD: 2219 case ARM::VST1d32_UPD: 2220 case ARM::VST1d64_UPD: 2221 case ARM::VST1q8_UPD: 2222 case ARM::VST1q16_UPD: 2223 case ARM::VST1q32_UPD: 2224 case ARM::VST1q64_UPD: 2225 case ARM::VST1d8T_UPD: 2226 case ARM::VST1d16T_UPD: 2227 case ARM::VST1d32T_UPD: 2228 case ARM::VST1d64T_UPD: 2229 case ARM::VST1d8Q_UPD: 2230 case ARM::VST1d16Q_UPD: 2231 case ARM::VST1d32Q_UPD: 2232 case ARM::VST1d64Q_UPD: 2233 case ARM::VST2d8_UPD: 2234 case ARM::VST2d16_UPD: 2235 case ARM::VST2d32_UPD: 2236 case ARM::VST2q8_UPD: 2237 case ARM::VST2q16_UPD: 2238 case ARM::VST2q32_UPD: 2239 case ARM::VST2b8_UPD: 2240 case ARM::VST2b16_UPD: 2241 case ARM::VST2b32_UPD: 2242 case ARM::VST3d8_UPD: 2243 case ARM::VST3d16_UPD: 2244 case ARM::VST3d32_UPD: 2245 case ARM::VST3q8_UPD: 2246 case ARM::VST3q16_UPD: 2247 case ARM::VST3q32_UPD: 2248 case ARM::VST4d8_UPD: 2249 case ARM::VST4d16_UPD: 2250 case ARM::VST4d32_UPD: 2251 case ARM::VST4q8_UPD: 2252 case ARM::VST4q16_UPD: 2253 case ARM::VST4q32_UPD: 2254 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) 2255 return MCDisassembler::Fail; 2256 break; 2257 default: 2258 break; 2259 } 2260 2261 // AddrMode6 Base (register+alignment) 2262 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) 2263 return MCDisassembler::Fail; 2264 2265 // AddrMode6 Offset (register) 2266 if (Rm == 0xD) 2267 Inst.addOperand(MCOperand::CreateReg(0)); 2268 else if (Rm != 0xF) { 2269 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2270 return MCDisassembler::Fail; 2271 } 2272 2273 // First input register 2274 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2275 return MCDisassembler::Fail; 2276 2277 // Second input register 2278 switch (Inst.getOpcode()) { 2279 case ARM::VST1q8: 2280 case ARM::VST1q16: 2281 case ARM::VST1q32: 2282 case ARM::VST1q64: 2283 case ARM::VST1q8_UPD: 2284 case ARM::VST1q16_UPD: 2285 case ARM::VST1q32_UPD: 2286 case ARM::VST1q64_UPD: 2287 case ARM::VST1d8T: 2288 case ARM::VST1d16T: 2289 case ARM::VST1d32T: 2290 case ARM::VST1d64T: 2291 case ARM::VST1d8T_UPD: 2292 case ARM::VST1d16T_UPD: 2293 case ARM::VST1d32T_UPD: 2294 case ARM::VST1d64T_UPD: 2295 case ARM::VST1d8Q: 2296 case ARM::VST1d16Q: 2297 case ARM::VST1d32Q: 2298 case ARM::VST1d64Q: 2299 case ARM::VST1d8Q_UPD: 2300 case ARM::VST1d16Q_UPD: 2301 case ARM::VST1d32Q_UPD: 2302 case ARM::VST1d64Q_UPD: 2303 case ARM::VST2d8: 2304 case ARM::VST2d16: 2305 case ARM::VST2d32: 2306 case ARM::VST2d8_UPD: 2307 case ARM::VST2d16_UPD: 2308 case ARM::VST2d32_UPD: 2309 case ARM::VST2q8: 2310 case ARM::VST2q16: 2311 case ARM::VST2q32: 2312 case ARM::VST2q8_UPD: 2313 case ARM::VST2q16_UPD: 2314 case ARM::VST2q32_UPD: 2315 case ARM::VST3d8: 2316 case ARM::VST3d16: 2317 case ARM::VST3d32: 2318 case ARM::VST3d8_UPD: 2319 case ARM::VST3d16_UPD: 2320 case ARM::VST3d32_UPD: 2321 case ARM::VST4d8: 2322 case ARM::VST4d16: 2323 case ARM::VST4d32: 2324 case ARM::VST4d8_UPD: 2325 case ARM::VST4d16_UPD: 2326 case ARM::VST4d32_UPD: 2327 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 2328 return MCDisassembler::Fail; 2329 break; 2330 case ARM::VST2b8: 2331 case ARM::VST2b16: 2332 case ARM::VST2b32: 2333 case ARM::VST2b8_UPD: 2334 case ARM::VST2b16_UPD: 2335 case ARM::VST2b32_UPD: 2336 case ARM::VST3q8: 2337 case ARM::VST3q16: 2338 case ARM::VST3q32: 2339 case ARM::VST3q8_UPD: 2340 case ARM::VST3q16_UPD: 2341 case ARM::VST3q32_UPD: 2342 case ARM::VST4q8: 2343 case ARM::VST4q16: 2344 case ARM::VST4q32: 2345 case ARM::VST4q8_UPD: 2346 case ARM::VST4q16_UPD: 2347 case ARM::VST4q32_UPD: 2348 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2349 return MCDisassembler::Fail; 2350 break; 2351 default: 2352 break; 2353 } 2354 2355 // Third input register 2356 switch (Inst.getOpcode()) { 2357 case ARM::VST1d8T: 2358 case ARM::VST1d16T: 2359 case ARM::VST1d32T: 2360 case ARM::VST1d64T: 2361 case ARM::VST1d8T_UPD: 2362 case ARM::VST1d16T_UPD: 2363 case ARM::VST1d32T_UPD: 2364 case ARM::VST1d64T_UPD: 2365 case ARM::VST1d8Q: 2366 case ARM::VST1d16Q: 2367 case ARM::VST1d32Q: 2368 case ARM::VST1d64Q: 2369 case ARM::VST1d8Q_UPD: 2370 case ARM::VST1d16Q_UPD: 2371 case ARM::VST1d32Q_UPD: 2372 case ARM::VST1d64Q_UPD: 2373 case ARM::VST2q8: 2374 case ARM::VST2q16: 2375 case ARM::VST2q32: 2376 case ARM::VST2q8_UPD: 2377 case ARM::VST2q16_UPD: 2378 case ARM::VST2q32_UPD: 2379 case ARM::VST3d8: 2380 case ARM::VST3d16: 2381 case ARM::VST3d32: 2382 case ARM::VST3d8_UPD: 2383 case ARM::VST3d16_UPD: 2384 case ARM::VST3d32_UPD: 2385 case ARM::VST4d8: 2386 case ARM::VST4d16: 2387 case ARM::VST4d32: 2388 case ARM::VST4d8_UPD: 2389 case ARM::VST4d16_UPD: 2390 case ARM::VST4d32_UPD: 2391 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2392 return MCDisassembler::Fail; 2393 break; 2394 case ARM::VST3q8: 2395 case ARM::VST3q16: 2396 case ARM::VST3q32: 2397 case ARM::VST3q8_UPD: 2398 case ARM::VST3q16_UPD: 2399 case ARM::VST3q32_UPD: 2400 case ARM::VST4q8: 2401 case ARM::VST4q16: 2402 case ARM::VST4q32: 2403 case ARM::VST4q8_UPD: 2404 case ARM::VST4q16_UPD: 2405 case ARM::VST4q32_UPD: 2406 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) 2407 return MCDisassembler::Fail; 2408 break; 2409 default: 2410 break; 2411 } 2412 2413 // Fourth input register 2414 switch (Inst.getOpcode()) { 2415 case ARM::VST1d8Q: 2416 case ARM::VST1d16Q: 2417 case ARM::VST1d32Q: 2418 case ARM::VST1d64Q: 2419 case ARM::VST1d8Q_UPD: 2420 case ARM::VST1d16Q_UPD: 2421 case ARM::VST1d32Q_UPD: 2422 case ARM::VST1d64Q_UPD: 2423 case ARM::VST2q8: 2424 case ARM::VST2q16: 2425 case ARM::VST2q32: 2426 case ARM::VST2q8_UPD: 2427 case ARM::VST2q16_UPD: 2428 case ARM::VST2q32_UPD: 2429 case ARM::VST4d8: 2430 case ARM::VST4d16: 2431 case ARM::VST4d32: 2432 case ARM::VST4d8_UPD: 2433 case ARM::VST4d16_UPD: 2434 case ARM::VST4d32_UPD: 2435 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) 2436 return MCDisassembler::Fail; 2437 break; 2438 case ARM::VST4q8: 2439 case ARM::VST4q16: 2440 case ARM::VST4q32: 2441 case ARM::VST4q8_UPD: 2442 case ARM::VST4q16_UPD: 2443 case ARM::VST4q32_UPD: 2444 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) 2445 return MCDisassembler::Fail; 2446 break; 2447 default: 2448 break; 2449 } 2450 2451 return S; 2452 } 2453 2454 static DecodeStatus DecodeVLD1DupInstruction(llvm::MCInst &Inst, unsigned Insn, 2455 uint64_t Address, const void *Decoder) { 2456 DecodeStatus S = MCDisassembler::Success; 2457 2458 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2459 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2460 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2461 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2462 unsigned align = fieldFromInstruction32(Insn, 4, 1); 2463 unsigned size = fieldFromInstruction32(Insn, 6, 2); 2464 unsigned regs = fieldFromInstruction32(Insn, 5, 1) + 1; 2465 2466 align *= (1 << size); 2467 2468 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2469 return MCDisassembler::Fail; 2470 if (regs == 2) { 2471 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 2472 return MCDisassembler::Fail; 2473 } 2474 if (Rm != 0xF) { 2475 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2476 return MCDisassembler::Fail; 2477 } 2478 2479 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2480 return MCDisassembler::Fail; 2481 Inst.addOperand(MCOperand::CreateImm(align)); 2482 2483 if (Rm == 0xD) 2484 Inst.addOperand(MCOperand::CreateReg(0)); 2485 else if (Rm != 0xF) { 2486 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2487 return MCDisassembler::Fail; 2488 } 2489 2490 return S; 2491 } 2492 2493 static DecodeStatus DecodeVLD2DupInstruction(llvm::MCInst &Inst, unsigned Insn, 2494 uint64_t Address, const void *Decoder) { 2495 DecodeStatus S = MCDisassembler::Success; 2496 2497 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2498 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2499 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2500 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2501 unsigned align = fieldFromInstruction32(Insn, 4, 1); 2502 unsigned size = 1 << fieldFromInstruction32(Insn, 6, 2); 2503 unsigned inc = fieldFromInstruction32(Insn, 5, 1) + 1; 2504 align *= 2*size; 2505 2506 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2507 return MCDisassembler::Fail; 2508 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 2509 return MCDisassembler::Fail; 2510 if (Rm != 0xF) { 2511 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2512 return MCDisassembler::Fail; 2513 } 2514 2515 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2516 return MCDisassembler::Fail; 2517 Inst.addOperand(MCOperand::CreateImm(align)); 2518 2519 if (Rm == 0xD) 2520 Inst.addOperand(MCOperand::CreateReg(0)); 2521 else if (Rm != 0xF) { 2522 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2523 return MCDisassembler::Fail; 2524 } 2525 2526 return S; 2527 } 2528 2529 static DecodeStatus DecodeVLD3DupInstruction(llvm::MCInst &Inst, unsigned Insn, 2530 uint64_t Address, const void *Decoder) { 2531 DecodeStatus S = MCDisassembler::Success; 2532 2533 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2534 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2535 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2536 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2537 unsigned inc = fieldFromInstruction32(Insn, 5, 1) + 1; 2538 2539 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2540 return MCDisassembler::Fail; 2541 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 2542 return MCDisassembler::Fail; 2543 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) 2544 return MCDisassembler::Fail; 2545 if (Rm != 0xF) { 2546 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2547 return MCDisassembler::Fail; 2548 } 2549 2550 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2551 return MCDisassembler::Fail; 2552 Inst.addOperand(MCOperand::CreateImm(0)); 2553 2554 if (Rm == 0xD) 2555 Inst.addOperand(MCOperand::CreateReg(0)); 2556 else if (Rm != 0xF) { 2557 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2558 return MCDisassembler::Fail; 2559 } 2560 2561 return S; 2562 } 2563 2564 static DecodeStatus DecodeVLD4DupInstruction(llvm::MCInst &Inst, unsigned Insn, 2565 uint64_t Address, const void *Decoder) { 2566 DecodeStatus S = MCDisassembler::Success; 2567 2568 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2569 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2570 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2571 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2572 unsigned size = fieldFromInstruction32(Insn, 6, 2); 2573 unsigned inc = fieldFromInstruction32(Insn, 5, 1) + 1; 2574 unsigned align = fieldFromInstruction32(Insn, 4, 1); 2575 2576 if (size == 0x3) { 2577 size = 4; 2578 align = 16; 2579 } else { 2580 if (size == 2) { 2581 size = 1 << size; 2582 align *= 8; 2583 } else { 2584 size = 1 << size; 2585 align *= 4*size; 2586 } 2587 } 2588 2589 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2590 return MCDisassembler::Fail; 2591 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 2592 return MCDisassembler::Fail; 2593 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) 2594 return MCDisassembler::Fail; 2595 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder))) 2596 return MCDisassembler::Fail; 2597 if (Rm != 0xF) { 2598 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2599 return MCDisassembler::Fail; 2600 } 2601 2602 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2603 return MCDisassembler::Fail; 2604 Inst.addOperand(MCOperand::CreateImm(align)); 2605 2606 if (Rm == 0xD) 2607 Inst.addOperand(MCOperand::CreateReg(0)); 2608 else if (Rm != 0xF) { 2609 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2610 return MCDisassembler::Fail; 2611 } 2612 2613 return S; 2614 } 2615 2616 static DecodeStatus 2617 DecodeNEONModImmInstruction(llvm::MCInst &Inst, unsigned Insn, 2618 uint64_t Address, const void *Decoder) { 2619 DecodeStatus S = MCDisassembler::Success; 2620 2621 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2622 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2623 unsigned imm = fieldFromInstruction32(Insn, 0, 4); 2624 imm |= fieldFromInstruction32(Insn, 16, 3) << 4; 2625 imm |= fieldFromInstruction32(Insn, 24, 1) << 7; 2626 imm |= fieldFromInstruction32(Insn, 8, 4) << 8; 2627 imm |= fieldFromInstruction32(Insn, 5, 1) << 12; 2628 unsigned Q = fieldFromInstruction32(Insn, 6, 1); 2629 2630 if (Q) { 2631 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 2632 return MCDisassembler::Fail; 2633 } else { 2634 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2635 return MCDisassembler::Fail; 2636 } 2637 2638 Inst.addOperand(MCOperand::CreateImm(imm)); 2639 2640 switch (Inst.getOpcode()) { 2641 case ARM::VORRiv4i16: 2642 case ARM::VORRiv2i32: 2643 case ARM::VBICiv4i16: 2644 case ARM::VBICiv2i32: 2645 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2646 return MCDisassembler::Fail; 2647 break; 2648 case ARM::VORRiv8i16: 2649 case ARM::VORRiv4i32: 2650 case ARM::VBICiv8i16: 2651 case ARM::VBICiv4i32: 2652 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 2653 return MCDisassembler::Fail; 2654 break; 2655 default: 2656 break; 2657 } 2658 2659 return S; 2660 } 2661 2662 static DecodeStatus DecodeVSHLMaxInstruction(llvm::MCInst &Inst, unsigned Insn, 2663 uint64_t Address, const void *Decoder) { 2664 DecodeStatus S = MCDisassembler::Success; 2665 2666 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2667 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2668 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2669 Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; 2670 unsigned size = fieldFromInstruction32(Insn, 18, 2); 2671 2672 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 2673 return MCDisassembler::Fail; 2674 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) 2675 return MCDisassembler::Fail; 2676 Inst.addOperand(MCOperand::CreateImm(8 << size)); 2677 2678 return S; 2679 } 2680 2681 static DecodeStatus DecodeShiftRight8Imm(llvm::MCInst &Inst, unsigned Val, 2682 uint64_t Address, const void *Decoder) { 2683 Inst.addOperand(MCOperand::CreateImm(8 - Val)); 2684 return MCDisassembler::Success; 2685 } 2686 2687 static DecodeStatus DecodeShiftRight16Imm(llvm::MCInst &Inst, unsigned Val, 2688 uint64_t Address, const void *Decoder) { 2689 Inst.addOperand(MCOperand::CreateImm(16 - Val)); 2690 return MCDisassembler::Success; 2691 } 2692 2693 static DecodeStatus DecodeShiftRight32Imm(llvm::MCInst &Inst, unsigned Val, 2694 uint64_t Address, const void *Decoder) { 2695 Inst.addOperand(MCOperand::CreateImm(32 - Val)); 2696 return MCDisassembler::Success; 2697 } 2698 2699 static DecodeStatus DecodeShiftRight64Imm(llvm::MCInst &Inst, unsigned Val, 2700 uint64_t Address, const void *Decoder) { 2701 Inst.addOperand(MCOperand::CreateImm(64 - Val)); 2702 return MCDisassembler::Success; 2703 } 2704 2705 static DecodeStatus DecodeTBLInstruction(llvm::MCInst &Inst, unsigned Insn, 2706 uint64_t Address, const void *Decoder) { 2707 DecodeStatus S = MCDisassembler::Success; 2708 2709 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 2710 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 2711 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2712 Rn |= fieldFromInstruction32(Insn, 7, 1) << 4; 2713 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 2714 Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; 2715 unsigned op = fieldFromInstruction32(Insn, 6, 1); 2716 unsigned length = fieldFromInstruction32(Insn, 8, 2) + 1; 2717 2718 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2719 return MCDisassembler::Fail; 2720 if (op) { 2721 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2722 return MCDisassembler::Fail; // Writeback 2723 } 2724 2725 for (unsigned i = 0; i < length; ++i) { 2726 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rn+i)%32, Address, Decoder))) 2727 return MCDisassembler::Fail; 2728 } 2729 2730 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) 2731 return MCDisassembler::Fail; 2732 2733 return S; 2734 } 2735 2736 static DecodeStatus DecodeThumbAddSpecialReg(llvm::MCInst &Inst, uint16_t Insn, 2737 uint64_t Address, const void *Decoder) { 2738 DecodeStatus S = MCDisassembler::Success; 2739 2740 unsigned dst = fieldFromInstruction16(Insn, 8, 3); 2741 unsigned imm = fieldFromInstruction16(Insn, 0, 8); 2742 2743 if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder))) 2744 return MCDisassembler::Fail; 2745 2746 switch(Inst.getOpcode()) { 2747 default: 2748 return MCDisassembler::Fail; 2749 case ARM::tADR: 2750 break; // tADR does not explicitly represent the PC as an operand. 2751 case ARM::tADDrSPi: 2752 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 2753 break; 2754 } 2755 2756 Inst.addOperand(MCOperand::CreateImm(imm)); 2757 return S; 2758 } 2759 2760 static DecodeStatus DecodeThumbBROperand(llvm::MCInst &Inst, unsigned Val, 2761 uint64_t Address, const void *Decoder) { 2762 Inst.addOperand(MCOperand::CreateImm(SignExtend32<12>(Val << 1))); 2763 return MCDisassembler::Success; 2764 } 2765 2766 static DecodeStatus DecodeT2BROperand(llvm::MCInst &Inst, unsigned Val, 2767 uint64_t Address, const void *Decoder) { 2768 Inst.addOperand(MCOperand::CreateImm(SignExtend32<21>(Val))); 2769 return MCDisassembler::Success; 2770 } 2771 2772 static DecodeStatus DecodeThumbCmpBROperand(llvm::MCInst &Inst, unsigned Val, 2773 uint64_t Address, const void *Decoder) { 2774 Inst.addOperand(MCOperand::CreateImm(SignExtend32<7>(Val << 1))); 2775 return MCDisassembler::Success; 2776 } 2777 2778 static DecodeStatus DecodeThumbAddrModeRR(llvm::MCInst &Inst, unsigned Val, 2779 uint64_t Address, const void *Decoder) { 2780 DecodeStatus S = MCDisassembler::Success; 2781 2782 unsigned Rn = fieldFromInstruction32(Val, 0, 3); 2783 unsigned Rm = fieldFromInstruction32(Val, 3, 3); 2784 2785 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) 2786 return MCDisassembler::Fail; 2787 if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder))) 2788 return MCDisassembler::Fail; 2789 2790 return S; 2791 } 2792 2793 static DecodeStatus DecodeThumbAddrModeIS(llvm::MCInst &Inst, unsigned Val, 2794 uint64_t Address, const void *Decoder) { 2795 DecodeStatus S = MCDisassembler::Success; 2796 2797 unsigned Rn = fieldFromInstruction32(Val, 0, 3); 2798 unsigned imm = fieldFromInstruction32(Val, 3, 5); 2799 2800 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) 2801 return MCDisassembler::Fail; 2802 Inst.addOperand(MCOperand::CreateImm(imm)); 2803 2804 return S; 2805 } 2806 2807 static DecodeStatus DecodeThumbAddrModePC(llvm::MCInst &Inst, unsigned Val, 2808 uint64_t Address, const void *Decoder) { 2809 unsigned imm = Val << 2; 2810 2811 Inst.addOperand(MCOperand::CreateImm(imm)); 2812 tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder); 2813 2814 return MCDisassembler::Success; 2815 } 2816 2817 static DecodeStatus DecodeThumbAddrModeSP(llvm::MCInst &Inst, unsigned Val, 2818 uint64_t Address, const void *Decoder) { 2819 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 2820 Inst.addOperand(MCOperand::CreateImm(Val)); 2821 2822 return MCDisassembler::Success; 2823 } 2824 2825 static DecodeStatus DecodeT2AddrModeSOReg(llvm::MCInst &Inst, unsigned Val, 2826 uint64_t Address, const void *Decoder) { 2827 DecodeStatus S = MCDisassembler::Success; 2828 2829 unsigned Rn = fieldFromInstruction32(Val, 6, 4); 2830 unsigned Rm = fieldFromInstruction32(Val, 2, 4); 2831 unsigned imm = fieldFromInstruction32(Val, 0, 2); 2832 2833 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2834 return MCDisassembler::Fail; 2835 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) 2836 return MCDisassembler::Fail; 2837 Inst.addOperand(MCOperand::CreateImm(imm)); 2838 2839 return S; 2840 } 2841 2842 static DecodeStatus DecodeT2LoadShift(llvm::MCInst &Inst, unsigned Insn, 2843 uint64_t Address, const void *Decoder) { 2844 DecodeStatus S = MCDisassembler::Success; 2845 2846 switch (Inst.getOpcode()) { 2847 case ARM::t2PLDs: 2848 case ARM::t2PLDWs: 2849 case ARM::t2PLIs: 2850 break; 2851 default: { 2852 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 2853 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 2854 return MCDisassembler::Fail; 2855 } 2856 } 2857 2858 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2859 if (Rn == 0xF) { 2860 switch (Inst.getOpcode()) { 2861 case ARM::t2LDRBs: 2862 Inst.setOpcode(ARM::t2LDRBpci); 2863 break; 2864 case ARM::t2LDRHs: 2865 Inst.setOpcode(ARM::t2LDRHpci); 2866 break; 2867 case ARM::t2LDRSHs: 2868 Inst.setOpcode(ARM::t2LDRSHpci); 2869 break; 2870 case ARM::t2LDRSBs: 2871 Inst.setOpcode(ARM::t2LDRSBpci); 2872 break; 2873 case ARM::t2PLDs: 2874 Inst.setOpcode(ARM::t2PLDi12); 2875 Inst.addOperand(MCOperand::CreateReg(ARM::PC)); 2876 break; 2877 default: 2878 return MCDisassembler::Fail; 2879 } 2880 2881 int imm = fieldFromInstruction32(Insn, 0, 12); 2882 if (!fieldFromInstruction32(Insn, 23, 1)) imm *= -1; 2883 Inst.addOperand(MCOperand::CreateImm(imm)); 2884 2885 return S; 2886 } 2887 2888 unsigned addrmode = fieldFromInstruction32(Insn, 4, 2); 2889 addrmode |= fieldFromInstruction32(Insn, 0, 4) << 2; 2890 addrmode |= fieldFromInstruction32(Insn, 16, 4) << 6; 2891 if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder))) 2892 return MCDisassembler::Fail; 2893 2894 return S; 2895 } 2896 2897 static DecodeStatus DecodeT2Imm8S4(llvm::MCInst &Inst, unsigned Val, 2898 uint64_t Address, const void *Decoder) { 2899 int imm = Val & 0xFF; 2900 if (!(Val & 0x100)) imm *= -1; 2901 Inst.addOperand(MCOperand::CreateImm(imm << 2)); 2902 2903 return MCDisassembler::Success; 2904 } 2905 2906 static DecodeStatus DecodeT2AddrModeImm8s4(llvm::MCInst &Inst, unsigned Val, 2907 uint64_t Address, const void *Decoder) { 2908 DecodeStatus S = MCDisassembler::Success; 2909 2910 unsigned Rn = fieldFromInstruction32(Val, 9, 4); 2911 unsigned imm = fieldFromInstruction32(Val, 0, 9); 2912 2913 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2914 return MCDisassembler::Fail; 2915 if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder))) 2916 return MCDisassembler::Fail; 2917 2918 return S; 2919 } 2920 2921 static DecodeStatus DecodeT2AddrModeImm0_1020s4(llvm::MCInst &Inst,unsigned Val, 2922 uint64_t Address, const void *Decoder) { 2923 DecodeStatus S = MCDisassembler::Success; 2924 2925 unsigned Rn = fieldFromInstruction32(Val, 8, 4); 2926 unsigned imm = fieldFromInstruction32(Val, 0, 8); 2927 2928 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 2929 return MCDisassembler::Fail; 2930 2931 Inst.addOperand(MCOperand::CreateImm(imm)); 2932 2933 return S; 2934 } 2935 2936 static DecodeStatus DecodeT2Imm8(llvm::MCInst &Inst, unsigned Val, 2937 uint64_t Address, const void *Decoder) { 2938 int imm = Val & 0xFF; 2939 if (Val == 0) 2940 imm = INT32_MIN; 2941 else if (!(Val & 0x100)) 2942 imm *= -1; 2943 Inst.addOperand(MCOperand::CreateImm(imm)); 2944 2945 return MCDisassembler::Success; 2946 } 2947 2948 2949 static DecodeStatus DecodeT2AddrModeImm8(llvm::MCInst &Inst, unsigned Val, 2950 uint64_t Address, const void *Decoder) { 2951 DecodeStatus S = MCDisassembler::Success; 2952 2953 unsigned Rn = fieldFromInstruction32(Val, 9, 4); 2954 unsigned imm = fieldFromInstruction32(Val, 0, 9); 2955 2956 // Some instructions always use an additive offset. 2957 switch (Inst.getOpcode()) { 2958 case ARM::t2LDRT: 2959 case ARM::t2LDRBT: 2960 case ARM::t2LDRHT: 2961 case ARM::t2LDRSBT: 2962 case ARM::t2LDRSHT: 2963 case ARM::t2STRT: 2964 case ARM::t2STRBT: 2965 case ARM::t2STRHT: 2966 imm |= 0x100; 2967 break; 2968 default: 2969 break; 2970 } 2971 2972 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2973 return MCDisassembler::Fail; 2974 if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder))) 2975 return MCDisassembler::Fail; 2976 2977 return S; 2978 } 2979 2980 static DecodeStatus DecodeT2LdStPre(llvm::MCInst &Inst, unsigned Insn, 2981 uint64_t Address, const void *Decoder) { 2982 DecodeStatus S = MCDisassembler::Success; 2983 2984 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 2985 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 2986 unsigned addr = fieldFromInstruction32(Insn, 0, 8); 2987 addr |= fieldFromInstruction32(Insn, 9, 1) << 8; 2988 addr |= Rn << 9; 2989 unsigned load = fieldFromInstruction32(Insn, 20, 1); 2990 2991 if (!load) { 2992 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2993 return MCDisassembler::Fail; 2994 } 2995 2996 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 2997 return MCDisassembler::Fail; 2998 2999 if (load) { 3000 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3001 return MCDisassembler::Fail; 3002 } 3003 3004 if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder))) 3005 return MCDisassembler::Fail; 3006 3007 return S; 3008 } 3009 3010 static DecodeStatus DecodeT2AddrModeImm12(llvm::MCInst &Inst, unsigned Val, 3011 uint64_t Address, const void *Decoder) { 3012 DecodeStatus S = MCDisassembler::Success; 3013 3014 unsigned Rn = fieldFromInstruction32(Val, 13, 4); 3015 unsigned imm = fieldFromInstruction32(Val, 0, 12); 3016 3017 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3018 return MCDisassembler::Fail; 3019 Inst.addOperand(MCOperand::CreateImm(imm)); 3020 3021 return S; 3022 } 3023 3024 3025 static DecodeStatus DecodeThumbAddSPImm(llvm::MCInst &Inst, uint16_t Insn, 3026 uint64_t Address, const void *Decoder) { 3027 unsigned imm = fieldFromInstruction16(Insn, 0, 7); 3028 3029 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3030 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3031 Inst.addOperand(MCOperand::CreateImm(imm)); 3032 3033 return MCDisassembler::Success; 3034 } 3035 3036 static DecodeStatus DecodeThumbAddSPReg(llvm::MCInst &Inst, uint16_t Insn, 3037 uint64_t Address, const void *Decoder) { 3038 DecodeStatus S = MCDisassembler::Success; 3039 3040 if (Inst.getOpcode() == ARM::tADDrSP) { 3041 unsigned Rdm = fieldFromInstruction16(Insn, 0, 3); 3042 Rdm |= fieldFromInstruction16(Insn, 7, 1) << 3; 3043 3044 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) 3045 return MCDisassembler::Fail; 3046 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) 3047 return MCDisassembler::Fail; 3048 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3049 } else if (Inst.getOpcode() == ARM::tADDspr) { 3050 unsigned Rm = fieldFromInstruction16(Insn, 3, 4); 3051 3052 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3053 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3054 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3055 return MCDisassembler::Fail; 3056 } 3057 3058 return S; 3059 } 3060 3061 static DecodeStatus DecodeThumbCPS(llvm::MCInst &Inst, uint16_t Insn, 3062 uint64_t Address, const void *Decoder) { 3063 unsigned imod = fieldFromInstruction16(Insn, 4, 1) | 0x2; 3064 unsigned flags = fieldFromInstruction16(Insn, 0, 3); 3065 3066 Inst.addOperand(MCOperand::CreateImm(imod)); 3067 Inst.addOperand(MCOperand::CreateImm(flags)); 3068 3069 return MCDisassembler::Success; 3070 } 3071 3072 static DecodeStatus DecodePostIdxReg(llvm::MCInst &Inst, unsigned Insn, 3073 uint64_t Address, const void *Decoder) { 3074 DecodeStatus S = MCDisassembler::Success; 3075 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3076 unsigned add = fieldFromInstruction32(Insn, 4, 1); 3077 3078 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3079 return MCDisassembler::Fail; 3080 Inst.addOperand(MCOperand::CreateImm(add)); 3081 3082 return S; 3083 } 3084 3085 static DecodeStatus DecodeThumbBLXOffset(llvm::MCInst &Inst, unsigned Val, 3086 uint64_t Address, const void *Decoder) { 3087 if (!tryAddingSymbolicOperand(Address, 3088 (Address & ~2u) + SignExtend32<22>(Val << 1) + 4, 3089 true, 4, Inst, Decoder)) 3090 Inst.addOperand(MCOperand::CreateImm(SignExtend32<22>(Val << 1))); 3091 return MCDisassembler::Success; 3092 } 3093 3094 static DecodeStatus DecodeCoprocessor(llvm::MCInst &Inst, unsigned Val, 3095 uint64_t Address, const void *Decoder) { 3096 if (Val == 0xA || Val == 0xB) 3097 return MCDisassembler::Fail; 3098 3099 Inst.addOperand(MCOperand::CreateImm(Val)); 3100 return MCDisassembler::Success; 3101 } 3102 3103 static DecodeStatus 3104 DecodeThumbTableBranch(llvm::MCInst &Inst, unsigned Insn, 3105 uint64_t Address, const void *Decoder) { 3106 DecodeStatus S = MCDisassembler::Success; 3107 3108 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3109 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3110 3111 if (Rn == ARM::SP) S = MCDisassembler::SoftFail; 3112 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3113 return MCDisassembler::Fail; 3114 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) 3115 return MCDisassembler::Fail; 3116 return S; 3117 } 3118 3119 static DecodeStatus 3120 DecodeThumb2BCCInstruction(llvm::MCInst &Inst, unsigned Insn, 3121 uint64_t Address, const void *Decoder) { 3122 DecodeStatus S = MCDisassembler::Success; 3123 3124 unsigned pred = fieldFromInstruction32(Insn, 22, 4); 3125 if (pred == 0xE || pred == 0xF) { 3126 unsigned opc = fieldFromInstruction32(Insn, 4, 28); 3127 switch (opc) { 3128 default: 3129 return MCDisassembler::Fail; 3130 case 0xf3bf8f4: 3131 Inst.setOpcode(ARM::t2DSB); 3132 break; 3133 case 0xf3bf8f5: 3134 Inst.setOpcode(ARM::t2DMB); 3135 break; 3136 case 0xf3bf8f6: 3137 Inst.setOpcode(ARM::t2ISB); 3138 break; 3139 } 3140 3141 unsigned imm = fieldFromInstruction32(Insn, 0, 4); 3142 return DecodeMemBarrierOption(Inst, imm, Address, Decoder); 3143 } 3144 3145 unsigned brtarget = fieldFromInstruction32(Insn, 0, 11) << 1; 3146 brtarget |= fieldFromInstruction32(Insn, 11, 1) << 19; 3147 brtarget |= fieldFromInstruction32(Insn, 13, 1) << 18; 3148 brtarget |= fieldFromInstruction32(Insn, 16, 6) << 12; 3149 brtarget |= fieldFromInstruction32(Insn, 26, 1) << 20; 3150 3151 if (!Check(S, DecodeT2BROperand(Inst, brtarget, Address, Decoder))) 3152 return MCDisassembler::Fail; 3153 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3154 return MCDisassembler::Fail; 3155 3156 return S; 3157 } 3158 3159 // Decode a shifted immediate operand. These basically consist 3160 // of an 8-bit value, and a 4-bit directive that specifies either 3161 // a splat operation or a rotation. 3162 static DecodeStatus DecodeT2SOImm(llvm::MCInst &Inst, unsigned Val, 3163 uint64_t Address, const void *Decoder) { 3164 unsigned ctrl = fieldFromInstruction32(Val, 10, 2); 3165 if (ctrl == 0) { 3166 unsigned byte = fieldFromInstruction32(Val, 8, 2); 3167 unsigned imm = fieldFromInstruction32(Val, 0, 8); 3168 switch (byte) { 3169 case 0: 3170 Inst.addOperand(MCOperand::CreateImm(imm)); 3171 break; 3172 case 1: 3173 Inst.addOperand(MCOperand::CreateImm((imm << 16) | imm)); 3174 break; 3175 case 2: 3176 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 8))); 3177 break; 3178 case 3: 3179 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 16) | 3180 (imm << 8) | imm)); 3181 break; 3182 } 3183 } else { 3184 unsigned unrot = fieldFromInstruction32(Val, 0, 7) | 0x80; 3185 unsigned rot = fieldFromInstruction32(Val, 7, 5); 3186 unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31)); 3187 Inst.addOperand(MCOperand::CreateImm(imm)); 3188 } 3189 3190 return MCDisassembler::Success; 3191 } 3192 3193 static DecodeStatus 3194 DecodeThumbBCCTargetOperand(llvm::MCInst &Inst, unsigned Val, 3195 uint64_t Address, const void *Decoder){ 3196 Inst.addOperand(MCOperand::CreateImm(Val << 1)); 3197 return MCDisassembler::Success; 3198 } 3199 3200 static DecodeStatus DecodeThumbBLTargetOperand(llvm::MCInst &Inst, unsigned Val, 3201 uint64_t Address, const void *Decoder){ 3202 Inst.addOperand(MCOperand::CreateImm(SignExtend32<22>(Val << 1))); 3203 return MCDisassembler::Success; 3204 } 3205 3206 static DecodeStatus DecodeMemBarrierOption(llvm::MCInst &Inst, unsigned Val, 3207 uint64_t Address, const void *Decoder) { 3208 switch (Val) { 3209 default: 3210 return MCDisassembler::Fail; 3211 case 0xF: // SY 3212 case 0xE: // ST 3213 case 0xB: // ISH 3214 case 0xA: // ISHST 3215 case 0x7: // NSH 3216 case 0x6: // NSHST 3217 case 0x3: // OSH 3218 case 0x2: // OSHST 3219 break; 3220 } 3221 3222 Inst.addOperand(MCOperand::CreateImm(Val)); 3223 return MCDisassembler::Success; 3224 } 3225 3226 static DecodeStatus DecodeMSRMask(llvm::MCInst &Inst, unsigned Val, 3227 uint64_t Address, const void *Decoder) { 3228 if (!Val) return MCDisassembler::Fail; 3229 Inst.addOperand(MCOperand::CreateImm(Val)); 3230 return MCDisassembler::Success; 3231 } 3232 3233 static DecodeStatus DecodeDoubleRegLoad(llvm::MCInst &Inst, unsigned Insn, 3234 uint64_t Address, const void *Decoder) { 3235 DecodeStatus S = MCDisassembler::Success; 3236 3237 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3238 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3239 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3240 3241 if ((Rt & 1) || Rt == 0xE || Rn == 0xF) return MCDisassembler::Fail; 3242 3243 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3244 return MCDisassembler::Fail; 3245 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 3246 return MCDisassembler::Fail; 3247 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3248 return MCDisassembler::Fail; 3249 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3250 return MCDisassembler::Fail; 3251 3252 return S; 3253 } 3254 3255 3256 static DecodeStatus DecodeDoubleRegStore(llvm::MCInst &Inst, unsigned Insn, 3257 uint64_t Address, const void *Decoder){ 3258 DecodeStatus S = MCDisassembler::Success; 3259 3260 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3261 unsigned Rt = fieldFromInstruction32(Insn, 0, 4); 3262 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3263 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3264 3265 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 3266 return MCDisassembler::Fail; 3267 3268 if ((Rt & 1) || Rt == 0xE || Rn == 0xF) return MCDisassembler::Fail; 3269 if (Rd == Rn || Rd == Rt || Rd == Rt+1) return MCDisassembler::Fail; 3270 3271 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3272 return MCDisassembler::Fail; 3273 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 3274 return MCDisassembler::Fail; 3275 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3276 return MCDisassembler::Fail; 3277 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3278 return MCDisassembler::Fail; 3279 3280 return S; 3281 } 3282 3283 static DecodeStatus DecodeLDRPreImm(llvm::MCInst &Inst, unsigned Insn, 3284 uint64_t Address, const void *Decoder) { 3285 DecodeStatus S = MCDisassembler::Success; 3286 3287 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3288 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3289 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 3290 imm |= fieldFromInstruction32(Insn, 16, 4) << 13; 3291 imm |= fieldFromInstruction32(Insn, 23, 1) << 12; 3292 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3293 3294 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3295 3296 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3297 return MCDisassembler::Fail; 3298 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3299 return MCDisassembler::Fail; 3300 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) 3301 return MCDisassembler::Fail; 3302 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3303 return MCDisassembler::Fail; 3304 3305 return S; 3306 } 3307 3308 static DecodeStatus DecodeLDRPreReg(llvm::MCInst &Inst, unsigned Insn, 3309 uint64_t Address, const void *Decoder) { 3310 DecodeStatus S = MCDisassembler::Success; 3311 3312 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3313 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3314 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 3315 imm |= fieldFromInstruction32(Insn, 16, 4) << 13; 3316 imm |= fieldFromInstruction32(Insn, 23, 1) << 12; 3317 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3318 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3319 3320 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3321 if (Rm == 0xF) S = MCDisassembler::SoftFail; 3322 3323 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3324 return MCDisassembler::Fail; 3325 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3326 return MCDisassembler::Fail; 3327 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) 3328 return MCDisassembler::Fail; 3329 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3330 return MCDisassembler::Fail; 3331 3332 return S; 3333 } 3334 3335 3336 static DecodeStatus DecodeSTRPreImm(llvm::MCInst &Inst, unsigned Insn, 3337 uint64_t Address, const void *Decoder) { 3338 DecodeStatus S = MCDisassembler::Success; 3339 3340 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3341 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3342 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 3343 imm |= fieldFromInstruction32(Insn, 16, 4) << 13; 3344 imm |= fieldFromInstruction32(Insn, 23, 1) << 12; 3345 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3346 3347 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3348 3349 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3350 return MCDisassembler::Fail; 3351 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3352 return MCDisassembler::Fail; 3353 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) 3354 return MCDisassembler::Fail; 3355 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3356 return MCDisassembler::Fail; 3357 3358 return S; 3359 } 3360 3361 static DecodeStatus DecodeSTRPreReg(llvm::MCInst &Inst, unsigned Insn, 3362 uint64_t Address, const void *Decoder) { 3363 DecodeStatus S = MCDisassembler::Success; 3364 3365 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3366 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3367 unsigned imm = fieldFromInstruction32(Insn, 0, 12); 3368 imm |= fieldFromInstruction32(Insn, 16, 4) << 13; 3369 imm |= fieldFromInstruction32(Insn, 23, 1) << 12; 3370 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3371 3372 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3373 3374 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3375 return MCDisassembler::Fail; 3376 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3377 return MCDisassembler::Fail; 3378 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) 3379 return MCDisassembler::Fail; 3380 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3381 return MCDisassembler::Fail; 3382 3383 return S; 3384 } 3385 3386 static DecodeStatus DecodeVLD1LN(llvm::MCInst &Inst, unsigned Insn, 3387 uint64_t Address, const void *Decoder) { 3388 DecodeStatus S = MCDisassembler::Success; 3389 3390 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3391 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3392 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3393 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3394 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3395 3396 unsigned align = 0; 3397 unsigned index = 0; 3398 switch (size) { 3399 default: 3400 return MCDisassembler::Fail; 3401 case 0: 3402 if (fieldFromInstruction32(Insn, 4, 1)) 3403 return MCDisassembler::Fail; // UNDEFINED 3404 index = fieldFromInstruction32(Insn, 5, 3); 3405 break; 3406 case 1: 3407 if (fieldFromInstruction32(Insn, 5, 1)) 3408 return MCDisassembler::Fail; // UNDEFINED 3409 index = fieldFromInstruction32(Insn, 6, 2); 3410 if (fieldFromInstruction32(Insn, 4, 1)) 3411 align = 2; 3412 break; 3413 case 2: 3414 if (fieldFromInstruction32(Insn, 6, 1)) 3415 return MCDisassembler::Fail; // UNDEFINED 3416 index = fieldFromInstruction32(Insn, 7, 1); 3417 if (fieldFromInstruction32(Insn, 4, 2) != 0) 3418 align = 4; 3419 } 3420 3421 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3422 return MCDisassembler::Fail; 3423 if (Rm != 0xF) { // Writeback 3424 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3425 return MCDisassembler::Fail; 3426 } 3427 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3428 return MCDisassembler::Fail; 3429 Inst.addOperand(MCOperand::CreateImm(align)); 3430 if (Rm != 0xF) { 3431 if (Rm != 0xD) { 3432 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3433 return MCDisassembler::Fail; 3434 } else 3435 Inst.addOperand(MCOperand::CreateReg(0)); 3436 } 3437 3438 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3439 return MCDisassembler::Fail; 3440 Inst.addOperand(MCOperand::CreateImm(index)); 3441 3442 return S; 3443 } 3444 3445 static DecodeStatus DecodeVST1LN(llvm::MCInst &Inst, unsigned Insn, 3446 uint64_t Address, const void *Decoder) { 3447 DecodeStatus S = MCDisassembler::Success; 3448 3449 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3450 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3451 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3452 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3453 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3454 3455 unsigned align = 0; 3456 unsigned index = 0; 3457 switch (size) { 3458 default: 3459 return MCDisassembler::Fail; 3460 case 0: 3461 if (fieldFromInstruction32(Insn, 4, 1)) 3462 return MCDisassembler::Fail; // UNDEFINED 3463 index = fieldFromInstruction32(Insn, 5, 3); 3464 break; 3465 case 1: 3466 if (fieldFromInstruction32(Insn, 5, 1)) 3467 return MCDisassembler::Fail; // UNDEFINED 3468 index = fieldFromInstruction32(Insn, 6, 2); 3469 if (fieldFromInstruction32(Insn, 4, 1)) 3470 align = 2; 3471 break; 3472 case 2: 3473 if (fieldFromInstruction32(Insn, 6, 1)) 3474 return MCDisassembler::Fail; // UNDEFINED 3475 index = fieldFromInstruction32(Insn, 7, 1); 3476 if (fieldFromInstruction32(Insn, 4, 2) != 0) 3477 align = 4; 3478 } 3479 3480 if (Rm != 0xF) { // Writeback 3481 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3482 return MCDisassembler::Fail; 3483 } 3484 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3485 return MCDisassembler::Fail; 3486 Inst.addOperand(MCOperand::CreateImm(align)); 3487 if (Rm != 0xF) { 3488 if (Rm != 0xD) { 3489 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3490 return MCDisassembler::Fail; 3491 } else 3492 Inst.addOperand(MCOperand::CreateReg(0)); 3493 } 3494 3495 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3496 return MCDisassembler::Fail; 3497 Inst.addOperand(MCOperand::CreateImm(index)); 3498 3499 return S; 3500 } 3501 3502 3503 static DecodeStatus DecodeVLD2LN(llvm::MCInst &Inst, unsigned Insn, 3504 uint64_t Address, const void *Decoder) { 3505 DecodeStatus S = MCDisassembler::Success; 3506 3507 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3508 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3509 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3510 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3511 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3512 3513 unsigned align = 0; 3514 unsigned index = 0; 3515 unsigned inc = 1; 3516 switch (size) { 3517 default: 3518 return MCDisassembler::Fail; 3519 case 0: 3520 index = fieldFromInstruction32(Insn, 5, 3); 3521 if (fieldFromInstruction32(Insn, 4, 1)) 3522 align = 2; 3523 break; 3524 case 1: 3525 index = fieldFromInstruction32(Insn, 6, 2); 3526 if (fieldFromInstruction32(Insn, 4, 1)) 3527 align = 4; 3528 if (fieldFromInstruction32(Insn, 5, 1)) 3529 inc = 2; 3530 break; 3531 case 2: 3532 if (fieldFromInstruction32(Insn, 5, 1)) 3533 return MCDisassembler::Fail; // UNDEFINED 3534 index = fieldFromInstruction32(Insn, 7, 1); 3535 if (fieldFromInstruction32(Insn, 4, 1) != 0) 3536 align = 8; 3537 if (fieldFromInstruction32(Insn, 6, 1)) 3538 inc = 2; 3539 break; 3540 } 3541 3542 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3543 return MCDisassembler::Fail; 3544 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3545 return MCDisassembler::Fail; 3546 if (Rm != 0xF) { // Writeback 3547 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3548 return MCDisassembler::Fail; 3549 } 3550 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3551 return MCDisassembler::Fail; 3552 Inst.addOperand(MCOperand::CreateImm(align)); 3553 if (Rm != 0xF) { 3554 if (Rm != 0xD) { 3555 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3556 return MCDisassembler::Fail; 3557 } else 3558 Inst.addOperand(MCOperand::CreateReg(0)); 3559 } 3560 3561 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3562 return MCDisassembler::Fail; 3563 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3564 return MCDisassembler::Fail; 3565 Inst.addOperand(MCOperand::CreateImm(index)); 3566 3567 return S; 3568 } 3569 3570 static DecodeStatus DecodeVST2LN(llvm::MCInst &Inst, unsigned Insn, 3571 uint64_t Address, const void *Decoder) { 3572 DecodeStatus S = MCDisassembler::Success; 3573 3574 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3575 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3576 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3577 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3578 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3579 3580 unsigned align = 0; 3581 unsigned index = 0; 3582 unsigned inc = 1; 3583 switch (size) { 3584 default: 3585 return MCDisassembler::Fail; 3586 case 0: 3587 index = fieldFromInstruction32(Insn, 5, 3); 3588 if (fieldFromInstruction32(Insn, 4, 1)) 3589 align = 2; 3590 break; 3591 case 1: 3592 index = fieldFromInstruction32(Insn, 6, 2); 3593 if (fieldFromInstruction32(Insn, 4, 1)) 3594 align = 4; 3595 if (fieldFromInstruction32(Insn, 5, 1)) 3596 inc = 2; 3597 break; 3598 case 2: 3599 if (fieldFromInstruction32(Insn, 5, 1)) 3600 return MCDisassembler::Fail; // UNDEFINED 3601 index = fieldFromInstruction32(Insn, 7, 1); 3602 if (fieldFromInstruction32(Insn, 4, 1) != 0) 3603 align = 8; 3604 if (fieldFromInstruction32(Insn, 6, 1)) 3605 inc = 2; 3606 break; 3607 } 3608 3609 if (Rm != 0xF) { // Writeback 3610 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3611 return MCDisassembler::Fail; 3612 } 3613 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3614 return MCDisassembler::Fail; 3615 Inst.addOperand(MCOperand::CreateImm(align)); 3616 if (Rm != 0xF) { 3617 if (Rm != 0xD) { 3618 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3619 return MCDisassembler::Fail; 3620 } else 3621 Inst.addOperand(MCOperand::CreateReg(0)); 3622 } 3623 3624 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3625 return MCDisassembler::Fail; 3626 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3627 return MCDisassembler::Fail; 3628 Inst.addOperand(MCOperand::CreateImm(index)); 3629 3630 return S; 3631 } 3632 3633 3634 static DecodeStatus DecodeVLD3LN(llvm::MCInst &Inst, unsigned Insn, 3635 uint64_t Address, const void *Decoder) { 3636 DecodeStatus S = MCDisassembler::Success; 3637 3638 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3639 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3640 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3641 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3642 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3643 3644 unsigned align = 0; 3645 unsigned index = 0; 3646 unsigned inc = 1; 3647 switch (size) { 3648 default: 3649 return MCDisassembler::Fail; 3650 case 0: 3651 if (fieldFromInstruction32(Insn, 4, 1)) 3652 return MCDisassembler::Fail; // UNDEFINED 3653 index = fieldFromInstruction32(Insn, 5, 3); 3654 break; 3655 case 1: 3656 if (fieldFromInstruction32(Insn, 4, 1)) 3657 return MCDisassembler::Fail; // UNDEFINED 3658 index = fieldFromInstruction32(Insn, 6, 2); 3659 if (fieldFromInstruction32(Insn, 5, 1)) 3660 inc = 2; 3661 break; 3662 case 2: 3663 if (fieldFromInstruction32(Insn, 4, 2)) 3664 return MCDisassembler::Fail; // UNDEFINED 3665 index = fieldFromInstruction32(Insn, 7, 1); 3666 if (fieldFromInstruction32(Insn, 6, 1)) 3667 inc = 2; 3668 break; 3669 } 3670 3671 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3672 return MCDisassembler::Fail; 3673 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3674 return MCDisassembler::Fail; 3675 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3676 return MCDisassembler::Fail; 3677 3678 if (Rm != 0xF) { // Writeback 3679 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3680 return MCDisassembler::Fail; 3681 } 3682 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3683 return MCDisassembler::Fail; 3684 Inst.addOperand(MCOperand::CreateImm(align)); 3685 if (Rm != 0xF) { 3686 if (Rm != 0xD) { 3687 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3688 return MCDisassembler::Fail; 3689 } else 3690 Inst.addOperand(MCOperand::CreateReg(0)); 3691 } 3692 3693 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3694 return MCDisassembler::Fail; 3695 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3696 return MCDisassembler::Fail; 3697 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3698 return MCDisassembler::Fail; 3699 Inst.addOperand(MCOperand::CreateImm(index)); 3700 3701 return S; 3702 } 3703 3704 static DecodeStatus DecodeVST3LN(llvm::MCInst &Inst, unsigned Insn, 3705 uint64_t Address, const void *Decoder) { 3706 DecodeStatus S = MCDisassembler::Success; 3707 3708 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3709 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3710 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3711 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3712 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3713 3714 unsigned align = 0; 3715 unsigned index = 0; 3716 unsigned inc = 1; 3717 switch (size) { 3718 default: 3719 return MCDisassembler::Fail; 3720 case 0: 3721 if (fieldFromInstruction32(Insn, 4, 1)) 3722 return MCDisassembler::Fail; // UNDEFINED 3723 index = fieldFromInstruction32(Insn, 5, 3); 3724 break; 3725 case 1: 3726 if (fieldFromInstruction32(Insn, 4, 1)) 3727 return MCDisassembler::Fail; // UNDEFINED 3728 index = fieldFromInstruction32(Insn, 6, 2); 3729 if (fieldFromInstruction32(Insn, 5, 1)) 3730 inc = 2; 3731 break; 3732 case 2: 3733 if (fieldFromInstruction32(Insn, 4, 2)) 3734 return MCDisassembler::Fail; // UNDEFINED 3735 index = fieldFromInstruction32(Insn, 7, 1); 3736 if (fieldFromInstruction32(Insn, 6, 1)) 3737 inc = 2; 3738 break; 3739 } 3740 3741 if (Rm != 0xF) { // Writeback 3742 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3743 return MCDisassembler::Fail; 3744 } 3745 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3746 return MCDisassembler::Fail; 3747 Inst.addOperand(MCOperand::CreateImm(align)); 3748 if (Rm != 0xF) { 3749 if (Rm != 0xD) { 3750 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3751 return MCDisassembler::Fail; 3752 } else 3753 Inst.addOperand(MCOperand::CreateReg(0)); 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 Inst.addOperand(MCOperand::CreateImm(index)); 3763 3764 return S; 3765 } 3766 3767 3768 static DecodeStatus DecodeVLD4LN(llvm::MCInst &Inst, unsigned Insn, 3769 uint64_t Address, const void *Decoder) { 3770 DecodeStatus S = MCDisassembler::Success; 3771 3772 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3773 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3774 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3775 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3776 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3777 3778 unsigned align = 0; 3779 unsigned index = 0; 3780 unsigned inc = 1; 3781 switch (size) { 3782 default: 3783 return MCDisassembler::Fail; 3784 case 0: 3785 if (fieldFromInstruction32(Insn, 4, 1)) 3786 align = 4; 3787 index = fieldFromInstruction32(Insn, 5, 3); 3788 break; 3789 case 1: 3790 if (fieldFromInstruction32(Insn, 4, 1)) 3791 align = 8; 3792 index = fieldFromInstruction32(Insn, 6, 2); 3793 if (fieldFromInstruction32(Insn, 5, 1)) 3794 inc = 2; 3795 break; 3796 case 2: 3797 if (fieldFromInstruction32(Insn, 4, 2)) 3798 align = 4 << fieldFromInstruction32(Insn, 4, 2); 3799 index = fieldFromInstruction32(Insn, 7, 1); 3800 if (fieldFromInstruction32(Insn, 6, 1)) 3801 inc = 2; 3802 break; 3803 } 3804 3805 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3806 return MCDisassembler::Fail; 3807 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3808 return MCDisassembler::Fail; 3809 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3810 return MCDisassembler::Fail; 3811 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 3812 return MCDisassembler::Fail; 3813 3814 if (Rm != 0xF) { // Writeback 3815 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3816 return MCDisassembler::Fail; 3817 } 3818 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3819 return MCDisassembler::Fail; 3820 Inst.addOperand(MCOperand::CreateImm(align)); 3821 if (Rm != 0xF) { 3822 if (Rm != 0xD) { 3823 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3824 return MCDisassembler::Fail; 3825 } else 3826 Inst.addOperand(MCOperand::CreateReg(0)); 3827 } 3828 3829 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3830 return MCDisassembler::Fail; 3831 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3832 return MCDisassembler::Fail; 3833 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3834 return MCDisassembler::Fail; 3835 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 3836 return MCDisassembler::Fail; 3837 Inst.addOperand(MCOperand::CreateImm(index)); 3838 3839 return S; 3840 } 3841 3842 static DecodeStatus DecodeVST4LN(llvm::MCInst &Inst, unsigned Insn, 3843 uint64_t Address, const void *Decoder) { 3844 DecodeStatus S = MCDisassembler::Success; 3845 3846 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3847 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3848 unsigned Rd = fieldFromInstruction32(Insn, 12, 4); 3849 Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; 3850 unsigned size = fieldFromInstruction32(Insn, 10, 2); 3851 3852 unsigned align = 0; 3853 unsigned index = 0; 3854 unsigned inc = 1; 3855 switch (size) { 3856 default: 3857 return MCDisassembler::Fail; 3858 case 0: 3859 if (fieldFromInstruction32(Insn, 4, 1)) 3860 align = 4; 3861 index = fieldFromInstruction32(Insn, 5, 3); 3862 break; 3863 case 1: 3864 if (fieldFromInstruction32(Insn, 4, 1)) 3865 align = 8; 3866 index = fieldFromInstruction32(Insn, 6, 2); 3867 if (fieldFromInstruction32(Insn, 5, 1)) 3868 inc = 2; 3869 break; 3870 case 2: 3871 if (fieldFromInstruction32(Insn, 4, 2)) 3872 align = 4 << fieldFromInstruction32(Insn, 4, 2); 3873 index = fieldFromInstruction32(Insn, 7, 1); 3874 if (fieldFromInstruction32(Insn, 6, 1)) 3875 inc = 2; 3876 break; 3877 } 3878 3879 if (Rm != 0xF) { // Writeback 3880 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3881 return MCDisassembler::Fail; 3882 } 3883 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3884 return MCDisassembler::Fail; 3885 Inst.addOperand(MCOperand::CreateImm(align)); 3886 if (Rm != 0xF) { 3887 if (Rm != 0xD) { 3888 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3889 return MCDisassembler::Fail; 3890 } else 3891 Inst.addOperand(MCOperand::CreateReg(0)); 3892 } 3893 3894 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3895 return MCDisassembler::Fail; 3896 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3897 return MCDisassembler::Fail; 3898 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3899 return MCDisassembler::Fail; 3900 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 3901 return MCDisassembler::Fail; 3902 Inst.addOperand(MCOperand::CreateImm(index)); 3903 3904 return S; 3905 } 3906 3907 static DecodeStatus DecodeVMOVSRR(llvm::MCInst &Inst, unsigned Insn, 3908 uint64_t Address, const void *Decoder) { 3909 DecodeStatus S = MCDisassembler::Success; 3910 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3911 unsigned Rt2 = fieldFromInstruction32(Insn, 16, 4); 3912 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3913 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3914 Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; 3915 3916 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) 3917 S = MCDisassembler::SoftFail; 3918 3919 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) 3920 return MCDisassembler::Fail; 3921 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) 3922 return MCDisassembler::Fail; 3923 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) 3924 return MCDisassembler::Fail; 3925 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) 3926 return MCDisassembler::Fail; 3927 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3928 return MCDisassembler::Fail; 3929 3930 return S; 3931 } 3932 3933 static DecodeStatus DecodeVMOVRRS(llvm::MCInst &Inst, unsigned Insn, 3934 uint64_t Address, const void *Decoder) { 3935 DecodeStatus S = MCDisassembler::Success; 3936 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3937 unsigned Rt2 = fieldFromInstruction32(Insn, 16, 4); 3938 unsigned Rm = fieldFromInstruction32(Insn, 0, 4); 3939 unsigned pred = fieldFromInstruction32(Insn, 28, 4); 3940 Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; 3941 3942 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) 3943 S = MCDisassembler::SoftFail; 3944 3945 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) 3946 return MCDisassembler::Fail; 3947 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) 3948 return MCDisassembler::Fail; 3949 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) 3950 return MCDisassembler::Fail; 3951 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) 3952 return MCDisassembler::Fail; 3953 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3954 return MCDisassembler::Fail; 3955 3956 return S; 3957 } 3958 3959 static DecodeStatus DecodeIT(llvm::MCInst &Inst, unsigned Insn, 3960 uint64_t Address, const void *Decoder) { 3961 DecodeStatus S = MCDisassembler::Success; 3962 unsigned pred = fieldFromInstruction16(Insn, 4, 4); 3963 // The InstPrinter needs to have the low bit of the predicate in 3964 // the mask operand to be able to print it properly. 3965 unsigned mask = fieldFromInstruction16(Insn, 0, 5); 3966 3967 if (pred == 0xF) { 3968 pred = 0xE; 3969 S = MCDisassembler::SoftFail; 3970 } 3971 3972 if ((mask & 0xF) == 0) { 3973 // Preserve the high bit of the mask, which is the low bit of 3974 // the predicate. 3975 mask &= 0x10; 3976 mask |= 0x8; 3977 S = MCDisassembler::SoftFail; 3978 } 3979 3980 Inst.addOperand(MCOperand::CreateImm(pred)); 3981 Inst.addOperand(MCOperand::CreateImm(mask)); 3982 return S; 3983 } 3984 3985 static DecodeStatus 3986 DecodeT2LDRDPreInstruction(llvm::MCInst &Inst, unsigned Insn, 3987 uint64_t Address, const void *Decoder) { 3988 DecodeStatus S = MCDisassembler::Success; 3989 3990 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 3991 unsigned Rt2 = fieldFromInstruction32(Insn, 8, 4); 3992 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 3993 unsigned addr = fieldFromInstruction32(Insn, 0, 8); 3994 unsigned W = fieldFromInstruction32(Insn, 21, 1); 3995 unsigned U = fieldFromInstruction32(Insn, 23, 1); 3996 unsigned P = fieldFromInstruction32(Insn, 24, 1); 3997 bool writeback = (W == 1) | (P == 0); 3998 3999 addr |= (U << 8) | (Rn << 9); 4000 4001 if (writeback && (Rn == Rt || Rn == Rt2)) 4002 Check(S, MCDisassembler::SoftFail); 4003 if (Rt == Rt2) 4004 Check(S, MCDisassembler::SoftFail); 4005 4006 // Rt 4007 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 4008 return MCDisassembler::Fail; 4009 // Rt2 4010 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) 4011 return MCDisassembler::Fail; 4012 // Writeback operand 4013 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) 4014 return MCDisassembler::Fail; 4015 // addr 4016 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) 4017 return MCDisassembler::Fail; 4018 4019 return S; 4020 } 4021 4022 static DecodeStatus 4023 DecodeT2STRDPreInstruction(llvm::MCInst &Inst, unsigned Insn, 4024 uint64_t Address, const void *Decoder) { 4025 DecodeStatus S = MCDisassembler::Success; 4026 4027 unsigned Rt = fieldFromInstruction32(Insn, 12, 4); 4028 unsigned Rt2 = fieldFromInstruction32(Insn, 8, 4); 4029 unsigned Rn = fieldFromInstruction32(Insn, 16, 4); 4030 unsigned addr = fieldFromInstruction32(Insn, 0, 8); 4031 unsigned W = fieldFromInstruction32(Insn, 21, 1); 4032 unsigned U = fieldFromInstruction32(Insn, 23, 1); 4033 unsigned P = fieldFromInstruction32(Insn, 24, 1); 4034 bool writeback = (W == 1) | (P == 0); 4035 4036 addr |= (U << 8) | (Rn << 9); 4037 4038 if (writeback && (Rn == Rt || Rn == Rt2)) 4039 Check(S, MCDisassembler::SoftFail); 4040 4041 // Writeback operand 4042 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) 4043 return MCDisassembler::Fail; 4044 // Rt 4045 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 4046 return MCDisassembler::Fail; 4047 // Rt2 4048 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) 4049 return MCDisassembler::Fail; 4050 // addr 4051 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) 4052 return MCDisassembler::Fail; 4053 4054 return S; 4055 } 4056 4057 static DecodeStatus DecodeT2Adr(llvm::MCInst &Inst, uint32_t Insn, 4058 uint64_t Address, const void *Decoder) { 4059 unsigned sign1 = fieldFromInstruction32(Insn, 21, 1); 4060 unsigned sign2 = fieldFromInstruction32(Insn, 23, 1); 4061 if (sign1 != sign2) return MCDisassembler::Fail; 4062 4063 unsigned Val = fieldFromInstruction32(Insn, 0, 8); 4064 Val |= fieldFromInstruction32(Insn, 12, 3) << 8; 4065 Val |= fieldFromInstruction32(Insn, 26, 1) << 11; 4066 Val |= sign1 << 12; 4067 Inst.addOperand(MCOperand::CreateImm(SignExtend32<13>(Val))); 4068 4069 return MCDisassembler::Success; 4070 } 4071 4072 static DecodeStatus DecodeT2ShifterImmOperand(llvm::MCInst &Inst, uint32_t Val, 4073 uint64_t Address, 4074 const void *Decoder) { 4075 DecodeStatus S = MCDisassembler::Success; 4076 4077 // Shift of "asr #32" is not allowed in Thumb2 mode. 4078 if (Val == 0x20) S = MCDisassembler::SoftFail; 4079 Inst.addOperand(MCOperand::CreateImm(Val)); 4080 return S; 4081 } 4082 4083
