ARMDisassembler.cpp revision 960fb7437003dcb96c6af093e2d55e06e4c8bd43
1//===-- ARMDisassembler.cpp - Disassembler for ARM/Thumb ISA --------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#define DEBUG_TYPE "arm-disassembler" 11 12#include "MCTargetDesc/ARMAddressingModes.h" 13#include "MCTargetDesc/ARMMCExpr.h" 14#include "MCTargetDesc/ARMBaseInfo.h" 15#include "llvm/MC/EDInstInfo.h" 16#include "llvm/MC/MCInst.h" 17#include "llvm/MC/MCInstrDesc.h" 18#include "llvm/MC/MCExpr.h" 19#include "llvm/MC/MCContext.h" 20#include "llvm/MC/MCDisassembler.h" 21#include "llvm/MC/MCFixedLenDisassembler.h" 22#include "llvm/MC/MCSubtargetInfo.h" 23#include "llvm/Support/Debug.h" 24#include "llvm/Support/MemoryObject.h" 25#include "llvm/Support/ErrorHandling.h" 26#include "llvm/Support/LEB128.h" 27#include "llvm/Support/TargetRegistry.h" 28#include "llvm/Support/raw_ostream.h" 29#include <vector> 30 31using namespace llvm; 32 33typedef MCDisassembler::DecodeStatus DecodeStatus; 34 35namespace { 36 // Handles the condition code status of instructions in IT blocks 37 class ITStatus 38 { 39 public: 40 // Returns the condition code for instruction in IT block 41 unsigned getITCC() { 42 unsigned CC = ARMCC::AL; 43 if (instrInITBlock()) 44 CC = ITStates.back(); 45 return CC; 46 } 47 48 // Advances the IT block state to the next T or E 49 void advanceITState() { 50 ITStates.pop_back(); 51 } 52 53 // Returns true if the current instruction is in an IT block 54 bool instrInITBlock() { 55 return !ITStates.empty(); 56 } 57 58 // Returns true if current instruction is the last instruction in an IT block 59 bool instrLastInITBlock() { 60 return ITStates.size() == 1; 61 } 62 63 // Called when decoding an IT instruction. Sets the IT state for the following 64 // instructions that for the IT block. Firstcond and Mask correspond to the 65 // fields in the IT instruction encoding. 66 void setITState(char Firstcond, char Mask) { 67 // (3 - the number of trailing zeros) is the number of then / else. 68 unsigned CondBit0 = Firstcond & 1; 69 unsigned NumTZ = CountTrailingZeros_32(Mask); 70 unsigned char CCBits = static_cast<unsigned char>(Firstcond & 0xf); 71 assert(NumTZ <= 3 && "Invalid IT mask!"); 72 // push condition codes onto the stack the correct order for the pops 73 for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) { 74 bool T = ((Mask >> Pos) & 1) == CondBit0; 75 if (T) 76 ITStates.push_back(CCBits); 77 else 78 ITStates.push_back(CCBits ^ 1); 79 } 80 ITStates.push_back(CCBits); 81 } 82 83 private: 84 std::vector<unsigned char> ITStates; 85 }; 86} 87 88namespace { 89/// ARMDisassembler - ARM disassembler for all ARM platforms. 90class ARMDisassembler : public MCDisassembler { 91public: 92 /// Constructor - Initializes the disassembler. 93 /// 94 ARMDisassembler(const MCSubtargetInfo &STI) : 95 MCDisassembler(STI) { 96 } 97 98 ~ARMDisassembler() { 99 } 100 101 /// getInstruction - See MCDisassembler. 102 DecodeStatus getInstruction(MCInst &instr, 103 uint64_t &size, 104 const MemoryObject ®ion, 105 uint64_t address, 106 raw_ostream &vStream, 107 raw_ostream &cStream) const; 108 109 /// getEDInfo - See MCDisassembler. 110 const EDInstInfo *getEDInfo() const; 111private: 112}; 113 114/// ThumbDisassembler - Thumb disassembler for all Thumb platforms. 115class ThumbDisassembler : public MCDisassembler { 116public: 117 /// Constructor - Initializes the disassembler. 118 /// 119 ThumbDisassembler(const MCSubtargetInfo &STI) : 120 MCDisassembler(STI) { 121 } 122 123 ~ThumbDisassembler() { 124 } 125 126 /// getInstruction - See MCDisassembler. 127 DecodeStatus getInstruction(MCInst &instr, 128 uint64_t &size, 129 const MemoryObject ®ion, 130 uint64_t address, 131 raw_ostream &vStream, 132 raw_ostream &cStream) const; 133 134 /// getEDInfo - See MCDisassembler. 135 const EDInstInfo *getEDInfo() const; 136private: 137 mutable ITStatus ITBlock; 138 DecodeStatus AddThumbPredicate(MCInst&) const; 139 void UpdateThumbVFPPredicate(MCInst&) const; 140}; 141} 142 143static bool Check(DecodeStatus &Out, DecodeStatus In) { 144 switch (In) { 145 case MCDisassembler::Success: 146 // Out stays the same. 147 return true; 148 case MCDisassembler::SoftFail: 149 Out = In; 150 return true; 151 case MCDisassembler::Fail: 152 Out = In; 153 return false; 154 } 155 llvm_unreachable("Invalid DecodeStatus!"); 156} 157 158 159// Forward declare these because the autogenerated code will reference them. 160// Definitions are further down. 161static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo, 162 uint64_t Address, const void *Decoder); 163static DecodeStatus DecodeGPRnopcRegisterClass(MCInst &Inst, 164 unsigned RegNo, uint64_t Address, 165 const void *Decoder); 166static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo, 167 uint64_t Address, const void *Decoder); 168static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo, 169 uint64_t Address, const void *Decoder); 170static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo, 171 uint64_t Address, const void *Decoder); 172static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo, 173 uint64_t Address, const void *Decoder); 174static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo, 175 uint64_t Address, const void *Decoder); 176static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo, 177 uint64_t Address, const void *Decoder); 178static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst &Inst, 179 unsigned RegNo, 180 uint64_t Address, 181 const void *Decoder); 182static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo, 183 uint64_t Address, const void *Decoder); 184static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo, 185 uint64_t Address, const void *Decoder); 186static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst &Inst, 187 unsigned RegNo, uint64_t Address, 188 const void *Decoder); 189 190static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val, 191 uint64_t Address, const void *Decoder); 192static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val, 193 uint64_t Address, const void *Decoder); 194static DecodeStatus DecodeSOImmOperand(MCInst &Inst, unsigned Val, 195 uint64_t Address, const void *Decoder); 196static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val, 197 uint64_t Address, const void *Decoder); 198static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val, 199 uint64_t Address, const void *Decoder); 200static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val, 201 uint64_t Address, const void *Decoder); 202 203static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Insn, 204 uint64_t Address, const void *Decoder); 205static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn, 206 uint64_t Address, const void *Decoder); 207static DecodeStatus DecodeAddrMode2IdxInstruction(MCInst &Inst, 208 unsigned Insn, 209 uint64_t Address, 210 const void *Decoder); 211static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Insn, 212 uint64_t Address, const void *Decoder); 213static DecodeStatus DecodeAddrMode3Instruction(MCInst &Inst,unsigned Insn, 214 uint64_t Address, const void *Decoder); 215static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Insn, 216 uint64_t Address, const void *Decoder); 217static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Insn, 218 uint64_t Address, const void *Decoder); 219 220static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst & Inst, 221 unsigned Insn, 222 uint64_t Adddress, 223 const void *Decoder); 224static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn, 225 uint64_t Address, const void *Decoder); 226static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn, 227 uint64_t Address, const void *Decoder); 228static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn, 229 uint64_t Address, const void *Decoder); 230static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn, 231 uint64_t Address, const void *Decoder); 232static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn, 233 uint64_t Address, const void *Decoder); 234static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val, 235 uint64_t Address, const void *Decoder); 236static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val, 237 uint64_t Address, const void *Decoder); 238static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val, 239 uint64_t Address, const void *Decoder); 240static DecodeStatus DecodeT2BInstruction(MCInst &Inst, unsigned Insn, 241 uint64_t Address, const void *Decoder); 242static DecodeStatus DecodeBranchImmInstruction(MCInst &Inst,unsigned Insn, 243 uint64_t Address, const void *Decoder); 244static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val, 245 uint64_t Address, const void *Decoder); 246static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Val, 247 uint64_t Address, const void *Decoder); 248static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Val, 249 uint64_t Address, const void *Decoder); 250static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Val, 251 uint64_t Address, const void *Decoder); 252static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Val, 253 uint64_t Address, const void *Decoder); 254static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Val, 255 uint64_t Address, const void *Decoder); 256static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Val, 257 uint64_t Address, const void *Decoder); 258static DecodeStatus DecodeNEONModImmInstruction(MCInst &Inst,unsigned Val, 259 uint64_t Address, const void *Decoder); 260static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Val, 261 uint64_t Address, const void *Decoder); 262static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val, 263 uint64_t Address, const void *Decoder); 264static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val, 265 uint64_t Address, const void *Decoder); 266static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val, 267 uint64_t Address, const void *Decoder); 268static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val, 269 uint64_t Address, const void *Decoder); 270static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn, 271 uint64_t Address, const void *Decoder); 272static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn, 273 uint64_t Address, const void *Decoder); 274static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Insn, 275 uint64_t Address, const void *Decoder); 276static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Insn, 277 uint64_t Address, const void *Decoder); 278static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Insn, 279 uint64_t Address, const void *Decoder); 280static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn, 281 uint64_t Address, const void *Decoder); 282static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn, 283 uint64_t Address, const void *Decoder); 284static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn, 285 uint64_t Address, const void *Decoder); 286static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn, 287 uint64_t Address, const void *Decoder); 288static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn, 289 uint64_t Address, const void *Decoder); 290static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn, 291 uint64_t Address, const void *Decoder); 292static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn, 293 uint64_t Address, const void *Decoder); 294static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn, 295 uint64_t Address, const void *Decoder); 296static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn, 297 uint64_t Address, const void *Decoder); 298static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn, 299 uint64_t Address, const void *Decoder); 300static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn, 301 uint64_t Address, const void *Decoder); 302static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn, 303 uint64_t Address, const void *Decoder); 304static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn, 305 uint64_t Address, const void *Decoder); 306static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn, 307 uint64_t Address, const void *Decoder); 308static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn, 309 uint64_t Address, const void *Decoder); 310static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn, 311 uint64_t Address, const void *Decoder); 312static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn, 313 uint64_t Address, const void *Decoder); 314static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn, 315 uint64_t Address, const void *Decoder); 316static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn, 317 uint64_t Address, const void *Decoder); 318 319 320static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn, 321 uint64_t Address, const void *Decoder); 322static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val, 323 uint64_t Address, const void *Decoder); 324static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val, 325 uint64_t Address, const void *Decoder); 326static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val, 327 uint64_t Address, const void *Decoder); 328static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val, 329 uint64_t Address, const void *Decoder); 330static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val, 331 uint64_t Address, const void *Decoder); 332static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val, 333 uint64_t Address, const void *Decoder); 334static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val, 335 uint64_t Address, const void *Decoder); 336static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val, 337 uint64_t Address, const void *Decoder); 338static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Val, 339 uint64_t Address, const void *Decoder); 340static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val, 341 uint64_t Address, const void *Decoder); 342static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val, 343 uint64_t Address, const void *Decoder); 344static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val, 345 uint64_t Address, const void *Decoder); 346static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val, 347 uint64_t Address, const void *Decoder); 348static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val, 349 uint64_t Address, const void *Decoder); 350static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Val, 351 uint64_t Address, const void *Decoder); 352static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn, 353 uint64_t Address, const void *Decoder); 354static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn, 355 uint64_t Address, const void *Decoder); 356static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Insn, 357 uint64_t Address, const void *Decoder); 358static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val, 359 uint64_t Address, const void *Decoder); 360static DecodeStatus DecodeThumbTableBranch(MCInst &Inst, unsigned Val, 361 uint64_t Address, const void *Decoder); 362static DecodeStatus DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Val, 363 uint64_t Address, const void *Decoder); 364static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val, 365 uint64_t Address, const void *Decoder); 366static DecodeStatus DecodeThumbBCCTargetOperand(MCInst &Inst,unsigned Val, 367 uint64_t Address, const void *Decoder); 368static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val, 369 uint64_t Address, const void *Decoder); 370static DecodeStatus DecodeIT(MCInst &Inst, unsigned Val, 371 uint64_t Address, const void *Decoder); 372static DecodeStatus DecodeT2LDRDPreInstruction(MCInst &Inst,unsigned Insn, 373 uint64_t Address, const void *Decoder); 374static DecodeStatus DecodeT2STRDPreInstruction(MCInst &Inst,unsigned Insn, 375 uint64_t Address, const void *Decoder); 376static DecodeStatus DecodeT2Adr(MCInst &Inst, unsigned Val, 377 uint64_t Address, const void *Decoder); 378static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Val, 379 uint64_t Address, const void *Decoder); 380static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, unsigned Val, 381 uint64_t Address, const void *Decoder); 382 383static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val, 384 uint64_t Address, const void *Decoder); 385static DecodeStatus DecodeMRRC2(llvm::MCInst &Inst, unsigned Val, 386 uint64_t Address, const void *Decoder); 387#include "ARMGenDisassemblerTables.inc" 388#include "ARMGenEDInfo.inc" 389 390static MCDisassembler *createARMDisassembler(const Target &T, const MCSubtargetInfo &STI) { 391 return new ARMDisassembler(STI); 392} 393 394static MCDisassembler *createThumbDisassembler(const Target &T, const MCSubtargetInfo &STI) { 395 return new ThumbDisassembler(STI); 396} 397 398const EDInstInfo *ARMDisassembler::getEDInfo() const { 399 return instInfoARM; 400} 401 402const EDInstInfo *ThumbDisassembler::getEDInfo() const { 403 return instInfoARM; 404} 405 406DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size, 407 const MemoryObject &Region, 408 uint64_t Address, 409 raw_ostream &os, 410 raw_ostream &cs) const { 411 CommentStream = &cs; 412 413 uint8_t bytes[4]; 414 415 assert(!(STI.getFeatureBits() & ARM::ModeThumb) && 416 "Asked to disassemble an ARM instruction but Subtarget is in Thumb mode!"); 417 418 // We want to read exactly 4 bytes of data. 419 if (Region.readBytes(Address, 4, (uint8_t*)bytes, NULL) == -1) { 420 Size = 0; 421 return MCDisassembler::Fail; 422 } 423 424 // Encoded as a small-endian 32-bit word in the stream. 425 uint32_t insn = (bytes[3] << 24) | 426 (bytes[2] << 16) | 427 (bytes[1] << 8) | 428 (bytes[0] << 0); 429 430 // Calling the auto-generated decoder function. 431 DecodeStatus result = decodeInstruction(DecoderTableARM32, MI, insn, 432 Address, this, STI); 433 if (result != MCDisassembler::Fail) { 434 Size = 4; 435 return result; 436 } 437 438 // VFP and NEON instructions, similarly, are shared between ARM 439 // and Thumb modes. 440 MI.clear(); 441 result = decodeInstruction(DecoderTableVFP32, MI, insn, Address, this, STI); 442 if (result != MCDisassembler::Fail) { 443 Size = 4; 444 return result; 445 } 446 447 MI.clear(); 448 result = decodeInstruction(DecoderTableNEONData32, MI, insn, Address, 449 this, STI); 450 if (result != MCDisassembler::Fail) { 451 Size = 4; 452 // Add a fake predicate operand, because we share these instruction 453 // definitions with Thumb2 where these instructions are predicable. 454 if (!DecodePredicateOperand(MI, 0xE, Address, this)) 455 return MCDisassembler::Fail; 456 return result; 457 } 458 459 MI.clear(); 460 result = decodeInstruction(DecoderTableNEONLoadStore32, MI, insn, Address, 461 this, STI); 462 if (result != MCDisassembler::Fail) { 463 Size = 4; 464 // Add a fake predicate operand, because we share these instruction 465 // definitions with Thumb2 where these instructions are predicable. 466 if (!DecodePredicateOperand(MI, 0xE, Address, this)) 467 return MCDisassembler::Fail; 468 return result; 469 } 470 471 MI.clear(); 472 result = decodeInstruction(DecoderTableNEONDup32, MI, insn, Address, 473 this, STI); 474 if (result != MCDisassembler::Fail) { 475 Size = 4; 476 // Add a fake predicate operand, because we share these instruction 477 // definitions with Thumb2 where these instructions are predicable. 478 if (!DecodePredicateOperand(MI, 0xE, Address, this)) 479 return MCDisassembler::Fail; 480 return result; 481 } 482 483 MI.clear(); 484 485 Size = 0; 486 return MCDisassembler::Fail; 487} 488 489namespace llvm { 490extern const MCInstrDesc ARMInsts[]; 491} 492 493/// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the 494/// immediate Value in the MCInst. The immediate Value has had any PC 495/// adjustment made by the caller. If the instruction is a branch instruction 496/// then isBranch is true, else false. If the getOpInfo() function was set as 497/// part of the setupForSymbolicDisassembly() call then that function is called 498/// to get any symbolic information at the Address for this instruction. If 499/// that returns non-zero then the symbolic information it returns is used to 500/// create an MCExpr and that is added as an operand to the MCInst. If 501/// getOpInfo() returns zero and isBranch is true then a symbol look up for 502/// Value is done and if a symbol is found an MCExpr is created with that, else 503/// an MCExpr with Value is created. This function returns true if it adds an 504/// operand to the MCInst and false otherwise. 505static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value, 506 bool isBranch, uint64_t InstSize, 507 MCInst &MI, const void *Decoder) { 508 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); 509 LLVMOpInfoCallback getOpInfo = Dis->getLLVMOpInfoCallback(); 510 struct LLVMOpInfo1 SymbolicOp; 511 memset(&SymbolicOp, '\0', sizeof(struct LLVMOpInfo1)); 512 SymbolicOp.Value = Value; 513 void *DisInfo = Dis->getDisInfoBlock(); 514 515 if (!getOpInfo || 516 !getOpInfo(DisInfo, Address, 0 /* Offset */, InstSize, 1, &SymbolicOp)) { 517 // Clear SymbolicOp.Value from above and also all other fields. 518 memset(&SymbolicOp, '\0', sizeof(struct LLVMOpInfo1)); 519 LLVMSymbolLookupCallback SymbolLookUp = Dis->getLLVMSymbolLookupCallback(); 520 if (!SymbolLookUp) 521 return false; 522 uint64_t ReferenceType; 523 if (isBranch) 524 ReferenceType = LLVMDisassembler_ReferenceType_In_Branch; 525 else 526 ReferenceType = LLVMDisassembler_ReferenceType_InOut_None; 527 const char *ReferenceName; 528 const char *Name = SymbolLookUp(DisInfo, Value, &ReferenceType, Address, 529 &ReferenceName); 530 if (Name) { 531 SymbolicOp.AddSymbol.Name = Name; 532 SymbolicOp.AddSymbol.Present = true; 533 } 534 // For branches always create an MCExpr so it gets printed as hex address. 535 else if (isBranch) { 536 SymbolicOp.Value = Value; 537 } 538 if(ReferenceType == LLVMDisassembler_ReferenceType_Out_SymbolStub) 539 (*Dis->CommentStream) << "symbol stub for: " << ReferenceName; 540 if (!Name && !isBranch) 541 return false; 542 } 543 544 MCContext *Ctx = Dis->getMCContext(); 545 const MCExpr *Add = NULL; 546 if (SymbolicOp.AddSymbol.Present) { 547 if (SymbolicOp.AddSymbol.Name) { 548 StringRef Name(SymbolicOp.AddSymbol.Name); 549 MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name); 550 Add = MCSymbolRefExpr::Create(Sym, *Ctx); 551 } else { 552 Add = MCConstantExpr::Create(SymbolicOp.AddSymbol.Value, *Ctx); 553 } 554 } 555 556 const MCExpr *Sub = NULL; 557 if (SymbolicOp.SubtractSymbol.Present) { 558 if (SymbolicOp.SubtractSymbol.Name) { 559 StringRef Name(SymbolicOp.SubtractSymbol.Name); 560 MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name); 561 Sub = MCSymbolRefExpr::Create(Sym, *Ctx); 562 } else { 563 Sub = MCConstantExpr::Create(SymbolicOp.SubtractSymbol.Value, *Ctx); 564 } 565 } 566 567 const MCExpr *Off = NULL; 568 if (SymbolicOp.Value != 0) 569 Off = MCConstantExpr::Create(SymbolicOp.Value, *Ctx); 570 571 const MCExpr *Expr; 572 if (Sub) { 573 const MCExpr *LHS; 574 if (Add) 575 LHS = MCBinaryExpr::CreateSub(Add, Sub, *Ctx); 576 else 577 LHS = MCUnaryExpr::CreateMinus(Sub, *Ctx); 578 if (Off != 0) 579 Expr = MCBinaryExpr::CreateAdd(LHS, Off, *Ctx); 580 else 581 Expr = LHS; 582 } else if (Add) { 583 if (Off != 0) 584 Expr = MCBinaryExpr::CreateAdd(Add, Off, *Ctx); 585 else 586 Expr = Add; 587 } else { 588 if (Off != 0) 589 Expr = Off; 590 else 591 Expr = MCConstantExpr::Create(0, *Ctx); 592 } 593 594 if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_HI16) 595 MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateUpper16(Expr, *Ctx))); 596 else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_LO16) 597 MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateLower16(Expr, *Ctx))); 598 else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_None) 599 MI.addOperand(MCOperand::CreateExpr(Expr)); 600 else 601 llvm_unreachable("bad SymbolicOp.VariantKind"); 602 603 return true; 604} 605 606/// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being 607/// referenced by a load instruction with the base register that is the Pc. 608/// These can often be values in a literal pool near the Address of the 609/// instruction. The Address of the instruction and its immediate Value are 610/// used as a possible literal pool entry. The SymbolLookUp call back will 611/// return the name of a symbol referenced by the literal pool's entry if 612/// the referenced address is that of a symbol. Or it will return a pointer to 613/// a literal 'C' string if the referenced address of the literal pool's entry 614/// is an address into a section with 'C' string literals. 615static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value, 616 const void *Decoder) { 617 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); 618 LLVMSymbolLookupCallback SymbolLookUp = Dis->getLLVMSymbolLookupCallback(); 619 if (SymbolLookUp) { 620 void *DisInfo = Dis->getDisInfoBlock(); 621 uint64_t ReferenceType; 622 ReferenceType = LLVMDisassembler_ReferenceType_In_PCrel_Load; 623 const char *ReferenceName; 624 (void)SymbolLookUp(DisInfo, Value, &ReferenceType, Address, &ReferenceName); 625 if(ReferenceType == LLVMDisassembler_ReferenceType_Out_LitPool_SymAddr || 626 ReferenceType == LLVMDisassembler_ReferenceType_Out_LitPool_CstrAddr) 627 (*Dis->CommentStream) << "literal pool for: " << ReferenceName; 628 } 629} 630 631// Thumb1 instructions don't have explicit S bits. Rather, they 632// implicitly set CPSR. Since it's not represented in the encoding, the 633// auto-generated decoder won't inject the CPSR operand. We need to fix 634// that as a post-pass. 635static void AddThumb1SBit(MCInst &MI, bool InITBlock) { 636 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; 637 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; 638 MCInst::iterator I = MI.begin(); 639 for (unsigned i = 0; i < NumOps; ++i, ++I) { 640 if (I == MI.end()) break; 641 if (OpInfo[i].isOptionalDef() && OpInfo[i].RegClass == ARM::CCRRegClassID) { 642 if (i > 0 && OpInfo[i-1].isPredicate()) continue; 643 MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR)); 644 return; 645 } 646 } 647 648 MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR)); 649} 650 651// Most Thumb instructions don't have explicit predicates in the 652// encoding, but rather get their predicates from IT context. We need 653// to fix up the predicate operands using this context information as a 654// post-pass. 655MCDisassembler::DecodeStatus 656ThumbDisassembler::AddThumbPredicate(MCInst &MI) const { 657 MCDisassembler::DecodeStatus S = Success; 658 659 // A few instructions actually have predicates encoded in them. Don't 660 // try to overwrite it if we're seeing one of those. 661 switch (MI.getOpcode()) { 662 case ARM::tBcc: 663 case ARM::t2Bcc: 664 case ARM::tCBZ: 665 case ARM::tCBNZ: 666 case ARM::tCPS: 667 case ARM::t2CPS3p: 668 case ARM::t2CPS2p: 669 case ARM::t2CPS1p: 670 case ARM::tMOVSr: 671 case ARM::tSETEND: 672 // Some instructions (mostly conditional branches) are not 673 // allowed in IT blocks. 674 if (ITBlock.instrInITBlock()) 675 S = SoftFail; 676 else 677 return Success; 678 break; 679 case ARM::tB: 680 case ARM::t2B: 681 case ARM::t2TBB: 682 case ARM::t2TBH: 683 // Some instructions (mostly unconditional branches) can 684 // only appears at the end of, or outside of, an IT. 685 if (ITBlock.instrInITBlock() && !ITBlock.instrLastInITBlock()) 686 S = SoftFail; 687 break; 688 default: 689 break; 690 } 691 692 // If we're in an IT block, base the predicate on that. Otherwise, 693 // assume a predicate of AL. 694 unsigned CC; 695 CC = ITBlock.getITCC(); 696 if (CC == 0xF) 697 CC = ARMCC::AL; 698 if (ITBlock.instrInITBlock()) 699 ITBlock.advanceITState(); 700 701 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; 702 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; 703 MCInst::iterator I = MI.begin(); 704 for (unsigned i = 0; i < NumOps; ++i, ++I) { 705 if (I == MI.end()) break; 706 if (OpInfo[i].isPredicate()) { 707 I = MI.insert(I, MCOperand::CreateImm(CC)); 708 ++I; 709 if (CC == ARMCC::AL) 710 MI.insert(I, MCOperand::CreateReg(0)); 711 else 712 MI.insert(I, MCOperand::CreateReg(ARM::CPSR)); 713 return S; 714 } 715 } 716 717 I = MI.insert(I, MCOperand::CreateImm(CC)); 718 ++I; 719 if (CC == ARMCC::AL) 720 MI.insert(I, MCOperand::CreateReg(0)); 721 else 722 MI.insert(I, MCOperand::CreateReg(ARM::CPSR)); 723 724 return S; 725} 726 727// Thumb VFP instructions are a special case. Because we share their 728// encodings between ARM and Thumb modes, and they are predicable in ARM 729// mode, the auto-generated decoder will give them an (incorrect) 730// predicate operand. We need to rewrite these operands based on the IT 731// context as a post-pass. 732void ThumbDisassembler::UpdateThumbVFPPredicate(MCInst &MI) const { 733 unsigned CC; 734 CC = ITBlock.getITCC(); 735 if (ITBlock.instrInITBlock()) 736 ITBlock.advanceITState(); 737 738 const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; 739 MCInst::iterator I = MI.begin(); 740 unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; 741 for (unsigned i = 0; i < NumOps; ++i, ++I) { 742 if (OpInfo[i].isPredicate() ) { 743 I->setImm(CC); 744 ++I; 745 if (CC == ARMCC::AL) 746 I->setReg(0); 747 else 748 I->setReg(ARM::CPSR); 749 return; 750 } 751 } 752} 753 754DecodeStatus ThumbDisassembler::getInstruction(MCInst &MI, uint64_t &Size, 755 const MemoryObject &Region, 756 uint64_t Address, 757 raw_ostream &os, 758 raw_ostream &cs) const { 759 CommentStream = &cs; 760 761 uint8_t bytes[4]; 762 763 assert((STI.getFeatureBits() & ARM::ModeThumb) && 764 "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!"); 765 766 // We want to read exactly 2 bytes of data. 767 if (Region.readBytes(Address, 2, (uint8_t*)bytes, NULL) == -1) { 768 Size = 0; 769 return MCDisassembler::Fail; 770 } 771 772 uint16_t insn16 = (bytes[1] << 8) | bytes[0]; 773 DecodeStatus result = decodeInstruction(DecoderTableThumb16, MI, insn16, 774 Address, this, STI); 775 if (result != MCDisassembler::Fail) { 776 Size = 2; 777 Check(result, AddThumbPredicate(MI)); 778 return result; 779 } 780 781 MI.clear(); 782 result = decodeInstruction(DecoderTableThumbSBit16, MI, insn16, 783 Address, this, STI); 784 if (result) { 785 Size = 2; 786 bool InITBlock = ITBlock.instrInITBlock(); 787 Check(result, AddThumbPredicate(MI)); 788 AddThumb1SBit(MI, InITBlock); 789 return result; 790 } 791 792 MI.clear(); 793 result = decodeInstruction(DecoderTableThumb216, MI, insn16, 794 Address, this, STI); 795 if (result != MCDisassembler::Fail) { 796 Size = 2; 797 798 // Nested IT blocks are UNPREDICTABLE. Must be checked before we add 799 // the Thumb predicate. 800 if (MI.getOpcode() == ARM::t2IT && ITBlock.instrInITBlock()) 801 result = MCDisassembler::SoftFail; 802 803 Check(result, AddThumbPredicate(MI)); 804 805 // If we find an IT instruction, we need to parse its condition 806 // code and mask operands so that we can apply them correctly 807 // to the subsequent instructions. 808 if (MI.getOpcode() == ARM::t2IT) { 809 810 unsigned Firstcond = MI.getOperand(0).getImm(); 811 unsigned Mask = MI.getOperand(1).getImm(); 812 ITBlock.setITState(Firstcond, Mask); 813 } 814 815 return result; 816 } 817 818 // We want to read exactly 4 bytes of data. 819 if (Region.readBytes(Address, 4, (uint8_t*)bytes, NULL) == -1) { 820 Size = 0; 821 return MCDisassembler::Fail; 822 } 823 824 uint32_t insn32 = (bytes[3] << 8) | 825 (bytes[2] << 0) | 826 (bytes[1] << 24) | 827 (bytes[0] << 16); 828 MI.clear(); 829 result = decodeInstruction(DecoderTableThumb32, MI, insn32, Address, 830 this, STI); 831 if (result != MCDisassembler::Fail) { 832 Size = 4; 833 bool InITBlock = ITBlock.instrInITBlock(); 834 Check(result, AddThumbPredicate(MI)); 835 AddThumb1SBit(MI, InITBlock); 836 return result; 837 } 838 839 MI.clear(); 840 result = decodeInstruction(DecoderTableThumb232, MI, insn32, Address, 841 this, STI); 842 if (result != MCDisassembler::Fail) { 843 Size = 4; 844 Check(result, AddThumbPredicate(MI)); 845 return result; 846 } 847 848 MI.clear(); 849 result = decodeInstruction(DecoderTableVFP32, MI, insn32, Address, this, STI); 850 if (result != MCDisassembler::Fail) { 851 Size = 4; 852 UpdateThumbVFPPredicate(MI); 853 return result; 854 } 855 856 MI.clear(); 857 result = decodeInstruction(DecoderTableNEONDup32, MI, insn32, Address, 858 this, STI); 859 if (result != MCDisassembler::Fail) { 860 Size = 4; 861 Check(result, AddThumbPredicate(MI)); 862 return result; 863 } 864 865 if (fieldFromInstruction(insn32, 24, 8) == 0xF9) { 866 MI.clear(); 867 uint32_t NEONLdStInsn = insn32; 868 NEONLdStInsn &= 0xF0FFFFFF; 869 NEONLdStInsn |= 0x04000000; 870 result = decodeInstruction(DecoderTableNEONLoadStore32, MI, NEONLdStInsn, 871 Address, this, STI); 872 if (result != MCDisassembler::Fail) { 873 Size = 4; 874 Check(result, AddThumbPredicate(MI)); 875 return result; 876 } 877 } 878 879 if (fieldFromInstruction(insn32, 24, 4) == 0xF) { 880 MI.clear(); 881 uint32_t NEONDataInsn = insn32; 882 NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24 883 NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24 884 NEONDataInsn |= 0x12000000; // Set bits 28 and 25 885 result = decodeInstruction(DecoderTableNEONData32, MI, NEONDataInsn, 886 Address, this, STI); 887 if (result != MCDisassembler::Fail) { 888 Size = 4; 889 Check(result, AddThumbPredicate(MI)); 890 return result; 891 } 892 } 893 894 Size = 0; 895 return MCDisassembler::Fail; 896} 897 898 899extern "C" void LLVMInitializeARMDisassembler() { 900 TargetRegistry::RegisterMCDisassembler(TheARMTarget, 901 createARMDisassembler); 902 TargetRegistry::RegisterMCDisassembler(TheThumbTarget, 903 createThumbDisassembler); 904} 905 906static const uint16_t GPRDecoderTable[] = { 907 ARM::R0, ARM::R1, ARM::R2, ARM::R3, 908 ARM::R4, ARM::R5, ARM::R6, ARM::R7, 909 ARM::R8, ARM::R9, ARM::R10, ARM::R11, 910 ARM::R12, ARM::SP, ARM::LR, ARM::PC 911}; 912 913static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, unsigned RegNo, 914 uint64_t Address, const void *Decoder) { 915 if (RegNo > 15) 916 return MCDisassembler::Fail; 917 918 unsigned Register = GPRDecoderTable[RegNo]; 919 Inst.addOperand(MCOperand::CreateReg(Register)); 920 return MCDisassembler::Success; 921} 922 923static DecodeStatus 924DecodeGPRnopcRegisterClass(MCInst &Inst, unsigned RegNo, 925 uint64_t Address, const void *Decoder) { 926 DecodeStatus S = MCDisassembler::Success; 927 928 if (RegNo == 15) 929 S = MCDisassembler::SoftFail; 930 931 Check(S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder)); 932 933 return S; 934} 935 936static DecodeStatus DecodetGPRRegisterClass(MCInst &Inst, unsigned RegNo, 937 uint64_t Address, const void *Decoder) { 938 if (RegNo > 7) 939 return MCDisassembler::Fail; 940 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); 941} 942 943static DecodeStatus DecodetcGPRRegisterClass(MCInst &Inst, unsigned RegNo, 944 uint64_t Address, const void *Decoder) { 945 unsigned Register = 0; 946 switch (RegNo) { 947 case 0: 948 Register = ARM::R0; 949 break; 950 case 1: 951 Register = ARM::R1; 952 break; 953 case 2: 954 Register = ARM::R2; 955 break; 956 case 3: 957 Register = ARM::R3; 958 break; 959 case 9: 960 Register = ARM::R9; 961 break; 962 case 12: 963 Register = ARM::R12; 964 break; 965 default: 966 return MCDisassembler::Fail; 967 } 968 969 Inst.addOperand(MCOperand::CreateReg(Register)); 970 return MCDisassembler::Success; 971} 972 973static DecodeStatus DecoderGPRRegisterClass(MCInst &Inst, unsigned RegNo, 974 uint64_t Address, const void *Decoder) { 975 if (RegNo == 13 || RegNo == 15) return MCDisassembler::Fail; 976 return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); 977} 978 979static const uint16_t SPRDecoderTable[] = { 980 ARM::S0, ARM::S1, ARM::S2, ARM::S3, 981 ARM::S4, ARM::S5, ARM::S6, ARM::S7, 982 ARM::S8, ARM::S9, ARM::S10, ARM::S11, 983 ARM::S12, ARM::S13, ARM::S14, ARM::S15, 984 ARM::S16, ARM::S17, ARM::S18, ARM::S19, 985 ARM::S20, ARM::S21, ARM::S22, ARM::S23, 986 ARM::S24, ARM::S25, ARM::S26, ARM::S27, 987 ARM::S28, ARM::S29, ARM::S30, ARM::S31 988}; 989 990static DecodeStatus DecodeSPRRegisterClass(MCInst &Inst, unsigned RegNo, 991 uint64_t Address, const void *Decoder) { 992 if (RegNo > 31) 993 return MCDisassembler::Fail; 994 995 unsigned Register = SPRDecoderTable[RegNo]; 996 Inst.addOperand(MCOperand::CreateReg(Register)); 997 return MCDisassembler::Success; 998} 999 1000static const uint16_t DPRDecoderTable[] = { 1001 ARM::D0, ARM::D1, ARM::D2, ARM::D3, 1002 ARM::D4, ARM::D5, ARM::D6, ARM::D7, 1003 ARM::D8, ARM::D9, ARM::D10, ARM::D11, 1004 ARM::D12, ARM::D13, ARM::D14, ARM::D15, 1005 ARM::D16, ARM::D17, ARM::D18, ARM::D19, 1006 ARM::D20, ARM::D21, ARM::D22, ARM::D23, 1007 ARM::D24, ARM::D25, ARM::D26, ARM::D27, 1008 ARM::D28, ARM::D29, ARM::D30, ARM::D31 1009}; 1010 1011static DecodeStatus DecodeDPRRegisterClass(MCInst &Inst, unsigned RegNo, 1012 uint64_t Address, const void *Decoder) { 1013 if (RegNo > 31) 1014 return MCDisassembler::Fail; 1015 1016 unsigned Register = DPRDecoderTable[RegNo]; 1017 Inst.addOperand(MCOperand::CreateReg(Register)); 1018 return MCDisassembler::Success; 1019} 1020 1021static DecodeStatus DecodeDPR_8RegisterClass(MCInst &Inst, unsigned RegNo, 1022 uint64_t Address, const void *Decoder) { 1023 if (RegNo > 7) 1024 return MCDisassembler::Fail; 1025 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); 1026} 1027 1028static DecodeStatus 1029DecodeDPR_VFP2RegisterClass(MCInst &Inst, unsigned RegNo, 1030 uint64_t Address, const void *Decoder) { 1031 if (RegNo > 15) 1032 return MCDisassembler::Fail; 1033 return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); 1034} 1035 1036static const uint16_t QPRDecoderTable[] = { 1037 ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3, 1038 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7, 1039 ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11, 1040 ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15 1041}; 1042 1043 1044static DecodeStatus DecodeQPRRegisterClass(MCInst &Inst, unsigned RegNo, 1045 uint64_t Address, const void *Decoder) { 1046 if (RegNo > 31) 1047 return MCDisassembler::Fail; 1048 RegNo >>= 1; 1049 1050 unsigned Register = QPRDecoderTable[RegNo]; 1051 Inst.addOperand(MCOperand::CreateReg(Register)); 1052 return MCDisassembler::Success; 1053} 1054 1055static const uint16_t DPairDecoderTable[] = { 1056 ARM::Q0, ARM::D1_D2, ARM::Q1, ARM::D3_D4, ARM::Q2, ARM::D5_D6, 1057 ARM::Q3, ARM::D7_D8, ARM::Q4, ARM::D9_D10, ARM::Q5, ARM::D11_D12, 1058 ARM::Q6, ARM::D13_D14, ARM::Q7, ARM::D15_D16, ARM::Q8, ARM::D17_D18, 1059 ARM::Q9, ARM::D19_D20, ARM::Q10, ARM::D21_D22, ARM::Q11, ARM::D23_D24, 1060 ARM::Q12, ARM::D25_D26, ARM::Q13, ARM::D27_D28, ARM::Q14, ARM::D29_D30, 1061 ARM::Q15 1062}; 1063 1064static DecodeStatus DecodeDPairRegisterClass(MCInst &Inst, unsigned RegNo, 1065 uint64_t Address, const void *Decoder) { 1066 if (RegNo > 30) 1067 return MCDisassembler::Fail; 1068 1069 unsigned Register = DPairDecoderTable[RegNo]; 1070 Inst.addOperand(MCOperand::CreateReg(Register)); 1071 return MCDisassembler::Success; 1072} 1073 1074static const uint16_t DPairSpacedDecoderTable[] = { 1075 ARM::D0_D2, ARM::D1_D3, ARM::D2_D4, ARM::D3_D5, 1076 ARM::D4_D6, ARM::D5_D7, ARM::D6_D8, ARM::D7_D9, 1077 ARM::D8_D10, ARM::D9_D11, ARM::D10_D12, ARM::D11_D13, 1078 ARM::D12_D14, ARM::D13_D15, ARM::D14_D16, ARM::D15_D17, 1079 ARM::D16_D18, ARM::D17_D19, ARM::D18_D20, ARM::D19_D21, 1080 ARM::D20_D22, ARM::D21_D23, ARM::D22_D24, ARM::D23_D25, 1081 ARM::D24_D26, ARM::D25_D27, ARM::D26_D28, ARM::D27_D29, 1082 ARM::D28_D30, ARM::D29_D31 1083}; 1084 1085static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst &Inst, 1086 unsigned RegNo, 1087 uint64_t Address, 1088 const void *Decoder) { 1089 if (RegNo > 29) 1090 return MCDisassembler::Fail; 1091 1092 unsigned Register = DPairSpacedDecoderTable[RegNo]; 1093 Inst.addOperand(MCOperand::CreateReg(Register)); 1094 return MCDisassembler::Success; 1095} 1096 1097static DecodeStatus DecodePredicateOperand(MCInst &Inst, unsigned Val, 1098 uint64_t Address, const void *Decoder) { 1099 if (Val == 0xF) return MCDisassembler::Fail; 1100 // AL predicate is not allowed on Thumb1 branches. 1101 if (Inst.getOpcode() == ARM::tBcc && Val == 0xE) 1102 return MCDisassembler::Fail; 1103 Inst.addOperand(MCOperand::CreateImm(Val)); 1104 if (Val == ARMCC::AL) { 1105 Inst.addOperand(MCOperand::CreateReg(0)); 1106 } else 1107 Inst.addOperand(MCOperand::CreateReg(ARM::CPSR)); 1108 return MCDisassembler::Success; 1109} 1110 1111static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val, 1112 uint64_t Address, const void *Decoder) { 1113 if (Val) 1114 Inst.addOperand(MCOperand::CreateReg(ARM::CPSR)); 1115 else 1116 Inst.addOperand(MCOperand::CreateReg(0)); 1117 return MCDisassembler::Success; 1118} 1119 1120static DecodeStatus DecodeSOImmOperand(MCInst &Inst, unsigned Val, 1121 uint64_t Address, const void *Decoder) { 1122 uint32_t imm = Val & 0xFF; 1123 uint32_t rot = (Val & 0xF00) >> 7; 1124 uint32_t rot_imm = (imm >> rot) | (imm << ((32-rot) & 0x1F)); 1125 Inst.addOperand(MCOperand::CreateImm(rot_imm)); 1126 return MCDisassembler::Success; 1127} 1128 1129static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Val, 1130 uint64_t Address, const void *Decoder) { 1131 DecodeStatus S = MCDisassembler::Success; 1132 1133 unsigned Rm = fieldFromInstruction(Val, 0, 4); 1134 unsigned type = fieldFromInstruction(Val, 5, 2); 1135 unsigned imm = fieldFromInstruction(Val, 7, 5); 1136 1137 // Register-immediate 1138 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1139 return MCDisassembler::Fail; 1140 1141 ARM_AM::ShiftOpc Shift = ARM_AM::lsl; 1142 switch (type) { 1143 case 0: 1144 Shift = ARM_AM::lsl; 1145 break; 1146 case 1: 1147 Shift = ARM_AM::lsr; 1148 break; 1149 case 2: 1150 Shift = ARM_AM::asr; 1151 break; 1152 case 3: 1153 Shift = ARM_AM::ror; 1154 break; 1155 } 1156 1157 if (Shift == ARM_AM::ror && imm == 0) 1158 Shift = ARM_AM::rrx; 1159 1160 unsigned Op = Shift | (imm << 3); 1161 Inst.addOperand(MCOperand::CreateImm(Op)); 1162 1163 return S; 1164} 1165 1166static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Val, 1167 uint64_t Address, const void *Decoder) { 1168 DecodeStatus S = MCDisassembler::Success; 1169 1170 unsigned Rm = fieldFromInstruction(Val, 0, 4); 1171 unsigned type = fieldFromInstruction(Val, 5, 2); 1172 unsigned Rs = fieldFromInstruction(Val, 8, 4); 1173 1174 // Register-register 1175 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1176 return MCDisassembler::Fail; 1177 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder))) 1178 return MCDisassembler::Fail; 1179 1180 ARM_AM::ShiftOpc Shift = ARM_AM::lsl; 1181 switch (type) { 1182 case 0: 1183 Shift = ARM_AM::lsl; 1184 break; 1185 case 1: 1186 Shift = ARM_AM::lsr; 1187 break; 1188 case 2: 1189 Shift = ARM_AM::asr; 1190 break; 1191 case 3: 1192 Shift = ARM_AM::ror; 1193 break; 1194 } 1195 1196 Inst.addOperand(MCOperand::CreateImm(Shift)); 1197 1198 return S; 1199} 1200 1201static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val, 1202 uint64_t Address, const void *Decoder) { 1203 DecodeStatus S = MCDisassembler::Success; 1204 1205 bool writebackLoad = false; 1206 unsigned writebackReg = 0; 1207 switch (Inst.getOpcode()) { 1208 default: 1209 break; 1210 case ARM::LDMIA_UPD: 1211 case ARM::LDMDB_UPD: 1212 case ARM::LDMIB_UPD: 1213 case ARM::LDMDA_UPD: 1214 case ARM::t2LDMIA_UPD: 1215 case ARM::t2LDMDB_UPD: 1216 writebackLoad = true; 1217 writebackReg = Inst.getOperand(0).getReg(); 1218 break; 1219 } 1220 1221 // Empty register lists are not allowed. 1222 if (CountPopulation_32(Val) == 0) return MCDisassembler::Fail; 1223 for (unsigned i = 0; i < 16; ++i) { 1224 if (Val & (1 << i)) { 1225 if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder))) 1226 return MCDisassembler::Fail; 1227 // Writeback not allowed if Rn is in the target list. 1228 if (writebackLoad && writebackReg == Inst.end()[-1].getReg()) 1229 Check(S, MCDisassembler::SoftFail); 1230 } 1231 } 1232 1233 return S; 1234} 1235 1236static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val, 1237 uint64_t Address, const void *Decoder) { 1238 DecodeStatus S = MCDisassembler::Success; 1239 1240 unsigned Vd = fieldFromInstruction(Val, 8, 5); 1241 unsigned regs = fieldFromInstruction(Val, 0, 8); 1242 1243 if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder))) 1244 return MCDisassembler::Fail; 1245 for (unsigned i = 0; i < (regs - 1); ++i) { 1246 if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder))) 1247 return MCDisassembler::Fail; 1248 } 1249 1250 return S; 1251} 1252 1253static DecodeStatus DecodeDPRRegListOperand(MCInst &Inst, unsigned Val, 1254 uint64_t Address, const void *Decoder) { 1255 DecodeStatus S = MCDisassembler::Success; 1256 1257 unsigned Vd = fieldFromInstruction(Val, 8, 5); 1258 unsigned regs = fieldFromInstruction(Val, 0, 8); 1259 1260 regs = regs >> 1; 1261 1262 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder))) 1263 return MCDisassembler::Fail; 1264 for (unsigned i = 0; i < (regs - 1); ++i) { 1265 if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder))) 1266 return MCDisassembler::Fail; 1267 } 1268 1269 return S; 1270} 1271 1272static DecodeStatus DecodeBitfieldMaskOperand(MCInst &Inst, unsigned Val, 1273 uint64_t Address, const void *Decoder) { 1274 // This operand encodes a mask of contiguous zeros between a specified MSB 1275 // and LSB. To decode it, we create the mask of all bits MSB-and-lower, 1276 // the mask of all bits LSB-and-lower, and then xor them to create 1277 // the mask of that's all ones on [msb, lsb]. Finally we not it to 1278 // create the final mask. 1279 unsigned msb = fieldFromInstruction(Val, 5, 5); 1280 unsigned lsb = fieldFromInstruction(Val, 0, 5); 1281 1282 DecodeStatus S = MCDisassembler::Success; 1283 if (lsb > msb) Check(S, MCDisassembler::SoftFail); 1284 1285 uint32_t msb_mask = 0xFFFFFFFF; 1286 if (msb != 31) msb_mask = (1U << (msb+1)) - 1; 1287 uint32_t lsb_mask = (1U << lsb) - 1; 1288 1289 Inst.addOperand(MCOperand::CreateImm(~(msb_mask ^ lsb_mask))); 1290 return S; 1291} 1292 1293static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn, 1294 uint64_t Address, const void *Decoder) { 1295 DecodeStatus S = MCDisassembler::Success; 1296 1297 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1298 unsigned CRd = fieldFromInstruction(Insn, 12, 4); 1299 unsigned coproc = fieldFromInstruction(Insn, 8, 4); 1300 unsigned imm = fieldFromInstruction(Insn, 0, 8); 1301 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1302 unsigned U = fieldFromInstruction(Insn, 23, 1); 1303 1304 switch (Inst.getOpcode()) { 1305 case ARM::LDC_OFFSET: 1306 case ARM::LDC_PRE: 1307 case ARM::LDC_POST: 1308 case ARM::LDC_OPTION: 1309 case ARM::LDCL_OFFSET: 1310 case ARM::LDCL_PRE: 1311 case ARM::LDCL_POST: 1312 case ARM::LDCL_OPTION: 1313 case ARM::STC_OFFSET: 1314 case ARM::STC_PRE: 1315 case ARM::STC_POST: 1316 case ARM::STC_OPTION: 1317 case ARM::STCL_OFFSET: 1318 case ARM::STCL_PRE: 1319 case ARM::STCL_POST: 1320 case ARM::STCL_OPTION: 1321 case ARM::t2LDC_OFFSET: 1322 case ARM::t2LDC_PRE: 1323 case ARM::t2LDC_POST: 1324 case ARM::t2LDC_OPTION: 1325 case ARM::t2LDCL_OFFSET: 1326 case ARM::t2LDCL_PRE: 1327 case ARM::t2LDCL_POST: 1328 case ARM::t2LDCL_OPTION: 1329 case ARM::t2STC_OFFSET: 1330 case ARM::t2STC_PRE: 1331 case ARM::t2STC_POST: 1332 case ARM::t2STC_OPTION: 1333 case ARM::t2STCL_OFFSET: 1334 case ARM::t2STCL_PRE: 1335 case ARM::t2STCL_POST: 1336 case ARM::t2STCL_OPTION: 1337 if (coproc == 0xA || coproc == 0xB) 1338 return MCDisassembler::Fail; 1339 break; 1340 default: 1341 break; 1342 } 1343 1344 Inst.addOperand(MCOperand::CreateImm(coproc)); 1345 Inst.addOperand(MCOperand::CreateImm(CRd)); 1346 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1347 return MCDisassembler::Fail; 1348 1349 switch (Inst.getOpcode()) { 1350 case ARM::t2LDC2_OFFSET: 1351 case ARM::t2LDC2L_OFFSET: 1352 case ARM::t2LDC2_PRE: 1353 case ARM::t2LDC2L_PRE: 1354 case ARM::t2STC2_OFFSET: 1355 case ARM::t2STC2L_OFFSET: 1356 case ARM::t2STC2_PRE: 1357 case ARM::t2STC2L_PRE: 1358 case ARM::LDC2_OFFSET: 1359 case ARM::LDC2L_OFFSET: 1360 case ARM::LDC2_PRE: 1361 case ARM::LDC2L_PRE: 1362 case ARM::STC2_OFFSET: 1363 case ARM::STC2L_OFFSET: 1364 case ARM::STC2_PRE: 1365 case ARM::STC2L_PRE: 1366 case ARM::t2LDC_OFFSET: 1367 case ARM::t2LDCL_OFFSET: 1368 case ARM::t2LDC_PRE: 1369 case ARM::t2LDCL_PRE: 1370 case ARM::t2STC_OFFSET: 1371 case ARM::t2STCL_OFFSET: 1372 case ARM::t2STC_PRE: 1373 case ARM::t2STCL_PRE: 1374 case ARM::LDC_OFFSET: 1375 case ARM::LDCL_OFFSET: 1376 case ARM::LDC_PRE: 1377 case ARM::LDCL_PRE: 1378 case ARM::STC_OFFSET: 1379 case ARM::STCL_OFFSET: 1380 case ARM::STC_PRE: 1381 case ARM::STCL_PRE: 1382 imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm); 1383 Inst.addOperand(MCOperand::CreateImm(imm)); 1384 break; 1385 case ARM::t2LDC2_POST: 1386 case ARM::t2LDC2L_POST: 1387 case ARM::t2STC2_POST: 1388 case ARM::t2STC2L_POST: 1389 case ARM::LDC2_POST: 1390 case ARM::LDC2L_POST: 1391 case ARM::STC2_POST: 1392 case ARM::STC2L_POST: 1393 case ARM::t2LDC_POST: 1394 case ARM::t2LDCL_POST: 1395 case ARM::t2STC_POST: 1396 case ARM::t2STCL_POST: 1397 case ARM::LDC_POST: 1398 case ARM::LDCL_POST: 1399 case ARM::STC_POST: 1400 case ARM::STCL_POST: 1401 imm |= U << 8; 1402 // fall through. 1403 default: 1404 // The 'option' variant doesn't encode 'U' in the immediate since 1405 // the immediate is unsigned [0,255]. 1406 Inst.addOperand(MCOperand::CreateImm(imm)); 1407 break; 1408 } 1409 1410 switch (Inst.getOpcode()) { 1411 case ARM::LDC_OFFSET: 1412 case ARM::LDC_PRE: 1413 case ARM::LDC_POST: 1414 case ARM::LDC_OPTION: 1415 case ARM::LDCL_OFFSET: 1416 case ARM::LDCL_PRE: 1417 case ARM::LDCL_POST: 1418 case ARM::LDCL_OPTION: 1419 case ARM::STC_OFFSET: 1420 case ARM::STC_PRE: 1421 case ARM::STC_POST: 1422 case ARM::STC_OPTION: 1423 case ARM::STCL_OFFSET: 1424 case ARM::STCL_PRE: 1425 case ARM::STCL_POST: 1426 case ARM::STCL_OPTION: 1427 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1428 return MCDisassembler::Fail; 1429 break; 1430 default: 1431 break; 1432 } 1433 1434 return S; 1435} 1436 1437static DecodeStatus 1438DecodeAddrMode2IdxInstruction(MCInst &Inst, unsigned Insn, 1439 uint64_t Address, const void *Decoder) { 1440 DecodeStatus S = MCDisassembler::Success; 1441 1442 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1443 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 1444 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 1445 unsigned imm = fieldFromInstruction(Insn, 0, 12); 1446 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1447 unsigned reg = fieldFromInstruction(Insn, 25, 1); 1448 unsigned P = fieldFromInstruction(Insn, 24, 1); 1449 unsigned W = fieldFromInstruction(Insn, 21, 1); 1450 1451 // On stores, the writeback operand precedes Rt. 1452 switch (Inst.getOpcode()) { 1453 case ARM::STR_POST_IMM: 1454 case ARM::STR_POST_REG: 1455 case ARM::STRB_POST_IMM: 1456 case ARM::STRB_POST_REG: 1457 case ARM::STRT_POST_REG: 1458 case ARM::STRT_POST_IMM: 1459 case ARM::STRBT_POST_REG: 1460 case ARM::STRBT_POST_IMM: 1461 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1462 return MCDisassembler::Fail; 1463 break; 1464 default: 1465 break; 1466 } 1467 1468 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 1469 return MCDisassembler::Fail; 1470 1471 // On loads, the writeback operand comes after Rt. 1472 switch (Inst.getOpcode()) { 1473 case ARM::LDR_POST_IMM: 1474 case ARM::LDR_POST_REG: 1475 case ARM::LDRB_POST_IMM: 1476 case ARM::LDRB_POST_REG: 1477 case ARM::LDRBT_POST_REG: 1478 case ARM::LDRBT_POST_IMM: 1479 case ARM::LDRT_POST_REG: 1480 case ARM::LDRT_POST_IMM: 1481 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1482 return MCDisassembler::Fail; 1483 break; 1484 default: 1485 break; 1486 } 1487 1488 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1489 return MCDisassembler::Fail; 1490 1491 ARM_AM::AddrOpc Op = ARM_AM::add; 1492 if (!fieldFromInstruction(Insn, 23, 1)) 1493 Op = ARM_AM::sub; 1494 1495 bool writeback = (P == 0) || (W == 1); 1496 unsigned idx_mode = 0; 1497 if (P && writeback) 1498 idx_mode = ARMII::IndexModePre; 1499 else if (!P && writeback) 1500 idx_mode = ARMII::IndexModePost; 1501 1502 if (writeback && (Rn == 15 || Rn == Rt)) 1503 S = MCDisassembler::SoftFail; // UNPREDICTABLE 1504 1505 if (reg) { 1506 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 1507 return MCDisassembler::Fail; 1508 ARM_AM::ShiftOpc Opc = ARM_AM::lsl; 1509 switch( fieldFromInstruction(Insn, 5, 2)) { 1510 case 0: 1511 Opc = ARM_AM::lsl; 1512 break; 1513 case 1: 1514 Opc = ARM_AM::lsr; 1515 break; 1516 case 2: 1517 Opc = ARM_AM::asr; 1518 break; 1519 case 3: 1520 Opc = ARM_AM::ror; 1521 break; 1522 default: 1523 return MCDisassembler::Fail; 1524 } 1525 unsigned amt = fieldFromInstruction(Insn, 7, 5); 1526 unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode); 1527 1528 Inst.addOperand(MCOperand::CreateImm(imm)); 1529 } else { 1530 Inst.addOperand(MCOperand::CreateReg(0)); 1531 unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode); 1532 Inst.addOperand(MCOperand::CreateImm(tmp)); 1533 } 1534 1535 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1536 return MCDisassembler::Fail; 1537 1538 return S; 1539} 1540 1541static DecodeStatus DecodeSORegMemOperand(MCInst &Inst, unsigned Val, 1542 uint64_t Address, const void *Decoder) { 1543 DecodeStatus S = MCDisassembler::Success; 1544 1545 unsigned Rn = fieldFromInstruction(Val, 13, 4); 1546 unsigned Rm = fieldFromInstruction(Val, 0, 4); 1547 unsigned type = fieldFromInstruction(Val, 5, 2); 1548 unsigned imm = fieldFromInstruction(Val, 7, 5); 1549 unsigned U = fieldFromInstruction(Val, 12, 1); 1550 1551 ARM_AM::ShiftOpc ShOp = ARM_AM::lsl; 1552 switch (type) { 1553 case 0: 1554 ShOp = ARM_AM::lsl; 1555 break; 1556 case 1: 1557 ShOp = ARM_AM::lsr; 1558 break; 1559 case 2: 1560 ShOp = ARM_AM::asr; 1561 break; 1562 case 3: 1563 ShOp = ARM_AM::ror; 1564 break; 1565 } 1566 1567 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1568 return MCDisassembler::Fail; 1569 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1570 return MCDisassembler::Fail; 1571 unsigned shift; 1572 if (U) 1573 shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp); 1574 else 1575 shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp); 1576 Inst.addOperand(MCOperand::CreateImm(shift)); 1577 1578 return S; 1579} 1580 1581static DecodeStatus 1582DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn, 1583 uint64_t Address, const void *Decoder) { 1584 DecodeStatus S = MCDisassembler::Success; 1585 1586 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 1587 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1588 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 1589 unsigned type = fieldFromInstruction(Insn, 22, 1); 1590 unsigned imm = fieldFromInstruction(Insn, 8, 4); 1591 unsigned U = ((~fieldFromInstruction(Insn, 23, 1)) & 1) << 8; 1592 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1593 unsigned W = fieldFromInstruction(Insn, 21, 1); 1594 unsigned P = fieldFromInstruction(Insn, 24, 1); 1595 unsigned Rt2 = Rt + 1; 1596 1597 bool writeback = (W == 1) | (P == 0); 1598 1599 // For {LD,ST}RD, Rt must be even, else undefined. 1600 switch (Inst.getOpcode()) { 1601 case ARM::STRD: 1602 case ARM::STRD_PRE: 1603 case ARM::STRD_POST: 1604 case ARM::LDRD: 1605 case ARM::LDRD_PRE: 1606 case ARM::LDRD_POST: 1607 if (Rt & 0x1) S = MCDisassembler::SoftFail; 1608 break; 1609 default: 1610 break; 1611 } 1612 switch (Inst.getOpcode()) { 1613 case ARM::STRD: 1614 case ARM::STRD_PRE: 1615 case ARM::STRD_POST: 1616 if (P == 0 && W == 1) 1617 S = MCDisassembler::SoftFail; 1618 1619 if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2)) 1620 S = MCDisassembler::SoftFail; 1621 if (type && Rm == 15) 1622 S = MCDisassembler::SoftFail; 1623 if (Rt2 == 15) 1624 S = MCDisassembler::SoftFail; 1625 if (!type && fieldFromInstruction(Insn, 8, 4)) 1626 S = MCDisassembler::SoftFail; 1627 break; 1628 case ARM::STRH: 1629 case ARM::STRH_PRE: 1630 case ARM::STRH_POST: 1631 if (Rt == 15) 1632 S = MCDisassembler::SoftFail; 1633 if (writeback && (Rn == 15 || Rn == Rt)) 1634 S = MCDisassembler::SoftFail; 1635 if (!type && Rm == 15) 1636 S = MCDisassembler::SoftFail; 1637 break; 1638 case ARM::LDRD: 1639 case ARM::LDRD_PRE: 1640 case ARM::LDRD_POST: 1641 if (type && Rn == 15){ 1642 if (Rt2 == 15) 1643 S = MCDisassembler::SoftFail; 1644 break; 1645 } 1646 if (P == 0 && W == 1) 1647 S = MCDisassembler::SoftFail; 1648 if (!type && (Rt2 == 15 || Rm == 15 || Rm == Rt || Rm == Rt2)) 1649 S = MCDisassembler::SoftFail; 1650 if (!type && writeback && Rn == 15) 1651 S = MCDisassembler::SoftFail; 1652 if (writeback && (Rn == Rt || Rn == Rt2)) 1653 S = MCDisassembler::SoftFail; 1654 break; 1655 case ARM::LDRH: 1656 case ARM::LDRH_PRE: 1657 case ARM::LDRH_POST: 1658 if (type && Rn == 15){ 1659 if (Rt == 15) 1660 S = MCDisassembler::SoftFail; 1661 break; 1662 } 1663 if (Rt == 15) 1664 S = MCDisassembler::SoftFail; 1665 if (!type && Rm == 15) 1666 S = MCDisassembler::SoftFail; 1667 if (!type && writeback && (Rn == 15 || Rn == Rt)) 1668 S = MCDisassembler::SoftFail; 1669 break; 1670 case ARM::LDRSH: 1671 case ARM::LDRSH_PRE: 1672 case ARM::LDRSH_POST: 1673 case ARM::LDRSB: 1674 case ARM::LDRSB_PRE: 1675 case ARM::LDRSB_POST: 1676 if (type && Rn == 15){ 1677 if (Rt == 15) 1678 S = MCDisassembler::SoftFail; 1679 break; 1680 } 1681 if (type && (Rt == 15 || (writeback && Rn == Rt))) 1682 S = MCDisassembler::SoftFail; 1683 if (!type && (Rt == 15 || Rm == 15)) 1684 S = MCDisassembler::SoftFail; 1685 if (!type && writeback && (Rn == 15 || Rn == Rt)) 1686 S = MCDisassembler::SoftFail; 1687 break; 1688 default: 1689 break; 1690 } 1691 1692 if (writeback) { // Writeback 1693 if (P) 1694 U |= ARMII::IndexModePre << 9; 1695 else 1696 U |= ARMII::IndexModePost << 9; 1697 1698 // On stores, the writeback operand precedes Rt. 1699 switch (Inst.getOpcode()) { 1700 case ARM::STRD: 1701 case ARM::STRD_PRE: 1702 case ARM::STRD_POST: 1703 case ARM::STRH: 1704 case ARM::STRH_PRE: 1705 case ARM::STRH_POST: 1706 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1707 return MCDisassembler::Fail; 1708 break; 1709 default: 1710 break; 1711 } 1712 } 1713 1714 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 1715 return MCDisassembler::Fail; 1716 switch (Inst.getOpcode()) { 1717 case ARM::STRD: 1718 case ARM::STRD_PRE: 1719 case ARM::STRD_POST: 1720 case ARM::LDRD: 1721 case ARM::LDRD_PRE: 1722 case ARM::LDRD_POST: 1723 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 1724 return MCDisassembler::Fail; 1725 break; 1726 default: 1727 break; 1728 } 1729 1730 if (writeback) { 1731 // On loads, the writeback operand comes after Rt. 1732 switch (Inst.getOpcode()) { 1733 case ARM::LDRD: 1734 case ARM::LDRD_PRE: 1735 case ARM::LDRD_POST: 1736 case ARM::LDRH: 1737 case ARM::LDRH_PRE: 1738 case ARM::LDRH_POST: 1739 case ARM::LDRSH: 1740 case ARM::LDRSH_PRE: 1741 case ARM::LDRSH_POST: 1742 case ARM::LDRSB: 1743 case ARM::LDRSB_PRE: 1744 case ARM::LDRSB_POST: 1745 case ARM::LDRHTr: 1746 case ARM::LDRSBTr: 1747 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1748 return MCDisassembler::Fail; 1749 break; 1750 default: 1751 break; 1752 } 1753 } 1754 1755 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1756 return MCDisassembler::Fail; 1757 1758 if (type) { 1759 Inst.addOperand(MCOperand::CreateReg(0)); 1760 Inst.addOperand(MCOperand::CreateImm(U | (imm << 4) | Rm)); 1761 } else { 1762 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 1763 return MCDisassembler::Fail; 1764 Inst.addOperand(MCOperand::CreateImm(U)); 1765 } 1766 1767 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1768 return MCDisassembler::Fail; 1769 1770 return S; 1771} 1772 1773static DecodeStatus DecodeRFEInstruction(MCInst &Inst, unsigned Insn, 1774 uint64_t Address, const void *Decoder) { 1775 DecodeStatus S = MCDisassembler::Success; 1776 1777 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1778 unsigned mode = fieldFromInstruction(Insn, 23, 2); 1779 1780 switch (mode) { 1781 case 0: 1782 mode = ARM_AM::da; 1783 break; 1784 case 1: 1785 mode = ARM_AM::ia; 1786 break; 1787 case 2: 1788 mode = ARM_AM::db; 1789 break; 1790 case 3: 1791 mode = ARM_AM::ib; 1792 break; 1793 } 1794 1795 Inst.addOperand(MCOperand::CreateImm(mode)); 1796 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1797 return MCDisassembler::Fail; 1798 1799 return S; 1800} 1801 1802static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst &Inst, 1803 unsigned Insn, 1804 uint64_t Address, const void *Decoder) { 1805 DecodeStatus S = MCDisassembler::Success; 1806 1807 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 1808 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1809 unsigned reglist = fieldFromInstruction(Insn, 0, 16); 1810 1811 if (pred == 0xF) { 1812 switch (Inst.getOpcode()) { 1813 case ARM::LDMDA: 1814 Inst.setOpcode(ARM::RFEDA); 1815 break; 1816 case ARM::LDMDA_UPD: 1817 Inst.setOpcode(ARM::RFEDA_UPD); 1818 break; 1819 case ARM::LDMDB: 1820 Inst.setOpcode(ARM::RFEDB); 1821 break; 1822 case ARM::LDMDB_UPD: 1823 Inst.setOpcode(ARM::RFEDB_UPD); 1824 break; 1825 case ARM::LDMIA: 1826 Inst.setOpcode(ARM::RFEIA); 1827 break; 1828 case ARM::LDMIA_UPD: 1829 Inst.setOpcode(ARM::RFEIA_UPD); 1830 break; 1831 case ARM::LDMIB: 1832 Inst.setOpcode(ARM::RFEIB); 1833 break; 1834 case ARM::LDMIB_UPD: 1835 Inst.setOpcode(ARM::RFEIB_UPD); 1836 break; 1837 case ARM::STMDA: 1838 Inst.setOpcode(ARM::SRSDA); 1839 break; 1840 case ARM::STMDA_UPD: 1841 Inst.setOpcode(ARM::SRSDA_UPD); 1842 break; 1843 case ARM::STMDB: 1844 Inst.setOpcode(ARM::SRSDB); 1845 break; 1846 case ARM::STMDB_UPD: 1847 Inst.setOpcode(ARM::SRSDB_UPD); 1848 break; 1849 case ARM::STMIA: 1850 Inst.setOpcode(ARM::SRSIA); 1851 break; 1852 case ARM::STMIA_UPD: 1853 Inst.setOpcode(ARM::SRSIA_UPD); 1854 break; 1855 case ARM::STMIB: 1856 Inst.setOpcode(ARM::SRSIB); 1857 break; 1858 case ARM::STMIB_UPD: 1859 Inst.setOpcode(ARM::SRSIB_UPD); 1860 break; 1861 default: 1862 if (!Check(S, MCDisassembler::Fail)) return MCDisassembler::Fail; 1863 } 1864 1865 // For stores (which become SRS's, the only operand is the mode. 1866 if (fieldFromInstruction(Insn, 20, 1) == 0) { 1867 Inst.addOperand( 1868 MCOperand::CreateImm(fieldFromInstruction(Insn, 0, 4))); 1869 return S; 1870 } 1871 1872 return DecodeRFEInstruction(Inst, Insn, Address, Decoder); 1873 } 1874 1875 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1876 return MCDisassembler::Fail; 1877 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 1878 return MCDisassembler::Fail; // Tied 1879 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 1880 return MCDisassembler::Fail; 1881 if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder))) 1882 return MCDisassembler::Fail; 1883 1884 return S; 1885} 1886 1887static DecodeStatus DecodeCPSInstruction(MCInst &Inst, unsigned Insn, 1888 uint64_t Address, const void *Decoder) { 1889 unsigned imod = fieldFromInstruction(Insn, 18, 2); 1890 unsigned M = fieldFromInstruction(Insn, 17, 1); 1891 unsigned iflags = fieldFromInstruction(Insn, 6, 3); 1892 unsigned mode = fieldFromInstruction(Insn, 0, 5); 1893 1894 DecodeStatus S = MCDisassembler::Success; 1895 1896 // imod == '01' --> UNPREDICTABLE 1897 // NOTE: Even though this is technically UNPREDICTABLE, we choose to 1898 // return failure here. The '01' imod value is unprintable, so there's 1899 // nothing useful we could do even if we returned UNPREDICTABLE. 1900 1901 if (imod == 1) return MCDisassembler::Fail; 1902 1903 if (imod && M) { 1904 Inst.setOpcode(ARM::CPS3p); 1905 Inst.addOperand(MCOperand::CreateImm(imod)); 1906 Inst.addOperand(MCOperand::CreateImm(iflags)); 1907 Inst.addOperand(MCOperand::CreateImm(mode)); 1908 } else if (imod && !M) { 1909 Inst.setOpcode(ARM::CPS2p); 1910 Inst.addOperand(MCOperand::CreateImm(imod)); 1911 Inst.addOperand(MCOperand::CreateImm(iflags)); 1912 if (mode) S = MCDisassembler::SoftFail; 1913 } else if (!imod && M) { 1914 Inst.setOpcode(ARM::CPS1p); 1915 Inst.addOperand(MCOperand::CreateImm(mode)); 1916 if (iflags) S = MCDisassembler::SoftFail; 1917 } else { 1918 // imod == '00' && M == '0' --> UNPREDICTABLE 1919 Inst.setOpcode(ARM::CPS1p); 1920 Inst.addOperand(MCOperand::CreateImm(mode)); 1921 S = MCDisassembler::SoftFail; 1922 } 1923 1924 return S; 1925} 1926 1927static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn, 1928 uint64_t Address, const void *Decoder) { 1929 unsigned imod = fieldFromInstruction(Insn, 9, 2); 1930 unsigned M = fieldFromInstruction(Insn, 8, 1); 1931 unsigned iflags = fieldFromInstruction(Insn, 5, 3); 1932 unsigned mode = fieldFromInstruction(Insn, 0, 5); 1933 1934 DecodeStatus S = MCDisassembler::Success; 1935 1936 // imod == '01' --> UNPREDICTABLE 1937 // NOTE: Even though this is technically UNPREDICTABLE, we choose to 1938 // return failure here. The '01' imod value is unprintable, so there's 1939 // nothing useful we could do even if we returned UNPREDICTABLE. 1940 1941 if (imod == 1) return MCDisassembler::Fail; 1942 1943 if (imod && M) { 1944 Inst.setOpcode(ARM::t2CPS3p); 1945 Inst.addOperand(MCOperand::CreateImm(imod)); 1946 Inst.addOperand(MCOperand::CreateImm(iflags)); 1947 Inst.addOperand(MCOperand::CreateImm(mode)); 1948 } else if (imod && !M) { 1949 Inst.setOpcode(ARM::t2CPS2p); 1950 Inst.addOperand(MCOperand::CreateImm(imod)); 1951 Inst.addOperand(MCOperand::CreateImm(iflags)); 1952 if (mode) S = MCDisassembler::SoftFail; 1953 } else if (!imod && M) { 1954 Inst.setOpcode(ARM::t2CPS1p); 1955 Inst.addOperand(MCOperand::CreateImm(mode)); 1956 if (iflags) S = MCDisassembler::SoftFail; 1957 } else { 1958 // imod == '00' && M == '0' --> UNPREDICTABLE 1959 Inst.setOpcode(ARM::t2CPS1p); 1960 Inst.addOperand(MCOperand::CreateImm(mode)); 1961 S = MCDisassembler::SoftFail; 1962 } 1963 1964 return S; 1965} 1966 1967static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn, 1968 uint64_t Address, const void *Decoder) { 1969 DecodeStatus S = MCDisassembler::Success; 1970 1971 unsigned Rd = fieldFromInstruction(Insn, 8, 4); 1972 unsigned imm = 0; 1973 1974 imm |= (fieldFromInstruction(Insn, 0, 8) << 0); 1975 imm |= (fieldFromInstruction(Insn, 12, 3) << 8); 1976 imm |= (fieldFromInstruction(Insn, 16, 4) << 12); 1977 imm |= (fieldFromInstruction(Insn, 26, 1) << 11); 1978 1979 if (Inst.getOpcode() == ARM::t2MOVTi16) 1980 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1981 return MCDisassembler::Fail; 1982 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 1983 return MCDisassembler::Fail; 1984 1985 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) 1986 Inst.addOperand(MCOperand::CreateImm(imm)); 1987 1988 return S; 1989} 1990 1991static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn, 1992 uint64_t Address, const void *Decoder) { 1993 DecodeStatus S = MCDisassembler::Success; 1994 1995 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 1996 unsigned pred = fieldFromInstruction(Insn, 28, 4); 1997 unsigned imm = 0; 1998 1999 imm |= (fieldFromInstruction(Insn, 0, 12) << 0); 2000 imm |= (fieldFromInstruction(Insn, 16, 4) << 12); 2001 2002 if (Inst.getOpcode() == ARM::MOVTi16) 2003 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 2004 return MCDisassembler::Fail; 2005 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 2006 return MCDisassembler::Fail; 2007 2008 if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) 2009 Inst.addOperand(MCOperand::CreateImm(imm)); 2010 2011 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 2012 return MCDisassembler::Fail; 2013 2014 return S; 2015} 2016 2017static DecodeStatus DecodeSMLAInstruction(MCInst &Inst, unsigned Insn, 2018 uint64_t Address, const void *Decoder) { 2019 DecodeStatus S = MCDisassembler::Success; 2020 2021 unsigned Rd = fieldFromInstruction(Insn, 16, 4); 2022 unsigned Rn = fieldFromInstruction(Insn, 0, 4); 2023 unsigned Rm = fieldFromInstruction(Insn, 8, 4); 2024 unsigned Ra = fieldFromInstruction(Insn, 12, 4); 2025 unsigned pred = fieldFromInstruction(Insn, 28, 4); 2026 2027 if (pred == 0xF) 2028 return DecodeCPSInstruction(Inst, Insn, Address, Decoder); 2029 2030 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) 2031 return MCDisassembler::Fail; 2032 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 2033 return MCDisassembler::Fail; 2034 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 2035 return MCDisassembler::Fail; 2036 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder))) 2037 return MCDisassembler::Fail; 2038 2039 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 2040 return MCDisassembler::Fail; 2041 2042 return S; 2043} 2044 2045static DecodeStatus DecodeAddrModeImm12Operand(MCInst &Inst, unsigned Val, 2046 uint64_t Address, const void *Decoder) { 2047 DecodeStatus S = MCDisassembler::Success; 2048 2049 unsigned add = fieldFromInstruction(Val, 12, 1); 2050 unsigned imm = fieldFromInstruction(Val, 0, 12); 2051 unsigned Rn = fieldFromInstruction(Val, 13, 4); 2052 2053 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2054 return MCDisassembler::Fail; 2055 2056 if (!add) imm *= -1; 2057 if (imm == 0 && !add) imm = INT32_MIN; 2058 Inst.addOperand(MCOperand::CreateImm(imm)); 2059 if (Rn == 15) 2060 tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder); 2061 2062 return S; 2063} 2064 2065static DecodeStatus DecodeAddrMode5Operand(MCInst &Inst, unsigned Val, 2066 uint64_t Address, const void *Decoder) { 2067 DecodeStatus S = MCDisassembler::Success; 2068 2069 unsigned Rn = fieldFromInstruction(Val, 9, 4); 2070 unsigned U = fieldFromInstruction(Val, 8, 1); 2071 unsigned imm = fieldFromInstruction(Val, 0, 8); 2072 2073 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2074 return MCDisassembler::Fail; 2075 2076 if (U) 2077 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add, imm))); 2078 else 2079 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm))); 2080 2081 return S; 2082} 2083 2084static DecodeStatus DecodeAddrMode7Operand(MCInst &Inst, unsigned Val, 2085 uint64_t Address, const void *Decoder) { 2086 return DecodeGPRRegisterClass(Inst, Val, Address, Decoder); 2087} 2088 2089static DecodeStatus 2090DecodeT2BInstruction(MCInst &Inst, unsigned Insn, 2091 uint64_t Address, const void *Decoder) { 2092 DecodeStatus S = MCDisassembler::Success; 2093 unsigned imm = (fieldFromInstruction(Insn, 0, 11) << 0) | 2094 (fieldFromInstruction(Insn, 11, 1) << 18) | 2095 (fieldFromInstruction(Insn, 13, 1) << 17) | 2096 (fieldFromInstruction(Insn, 16, 6) << 11) | 2097 (fieldFromInstruction(Insn, 26, 1) << 19); 2098 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<20>(imm<<1) + 4, 2099 true, 4, Inst, Decoder)) 2100 Inst.addOperand(MCOperand::CreateImm(SignExtend32<20>(imm << 1))); 2101 return S; 2102} 2103 2104static DecodeStatus 2105DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn, 2106 uint64_t Address, const void *Decoder) { 2107 DecodeStatus S = MCDisassembler::Success; 2108 2109 unsigned pred = fieldFromInstruction(Insn, 28, 4); 2110 unsigned imm = fieldFromInstruction(Insn, 0, 24) << 2; 2111 2112 if (pred == 0xF) { 2113 Inst.setOpcode(ARM::BLXi); 2114 imm |= fieldFromInstruction(Insn, 24, 1) << 1; 2115 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8, 2116 true, 4, Inst, Decoder)) 2117 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm))); 2118 return S; 2119 } 2120 2121 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8, 2122 true, 4, Inst, Decoder)) 2123 Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm))); 2124 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 2125 return MCDisassembler::Fail; 2126 2127 return S; 2128} 2129 2130 2131static DecodeStatus DecodeAddrMode6Operand(MCInst &Inst, unsigned Val, 2132 uint64_t Address, const void *Decoder) { 2133 DecodeStatus S = MCDisassembler::Success; 2134 2135 unsigned Rm = fieldFromInstruction(Val, 0, 4); 2136 unsigned align = fieldFromInstruction(Val, 4, 2); 2137 2138 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2139 return MCDisassembler::Fail; 2140 if (!align) 2141 Inst.addOperand(MCOperand::CreateImm(0)); 2142 else 2143 Inst.addOperand(MCOperand::CreateImm(4 << align)); 2144 2145 return S; 2146} 2147 2148static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Insn, 2149 uint64_t Address, const void *Decoder) { 2150 DecodeStatus S = MCDisassembler::Success; 2151 2152 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2153 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2154 unsigned wb = fieldFromInstruction(Insn, 16, 4); 2155 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2156 Rn |= fieldFromInstruction(Insn, 4, 2) << 4; 2157 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2158 2159 // First output register 2160 switch (Inst.getOpcode()) { 2161 case ARM::VLD1q16: case ARM::VLD1q32: case ARM::VLD1q64: case ARM::VLD1q8: 2162 case ARM::VLD1q16wb_fixed: case ARM::VLD1q16wb_register: 2163 case ARM::VLD1q32wb_fixed: case ARM::VLD1q32wb_register: 2164 case ARM::VLD1q64wb_fixed: case ARM::VLD1q64wb_register: 2165 case ARM::VLD1q8wb_fixed: case ARM::VLD1q8wb_register: 2166 case ARM::VLD2d16: case ARM::VLD2d32: case ARM::VLD2d8: 2167 case ARM::VLD2d16wb_fixed: case ARM::VLD2d16wb_register: 2168 case ARM::VLD2d32wb_fixed: case ARM::VLD2d32wb_register: 2169 case ARM::VLD2d8wb_fixed: case ARM::VLD2d8wb_register: 2170 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) 2171 return MCDisassembler::Fail; 2172 break; 2173 case ARM::VLD2b16: 2174 case ARM::VLD2b32: 2175 case ARM::VLD2b8: 2176 case ARM::VLD2b16wb_fixed: 2177 case ARM::VLD2b16wb_register: 2178 case ARM::VLD2b32wb_fixed: 2179 case ARM::VLD2b32wb_register: 2180 case ARM::VLD2b8wb_fixed: 2181 case ARM::VLD2b8wb_register: 2182 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder))) 2183 return MCDisassembler::Fail; 2184 break; 2185 default: 2186 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2187 return MCDisassembler::Fail; 2188 } 2189 2190 // Second output register 2191 switch (Inst.getOpcode()) { 2192 case ARM::VLD3d8: 2193 case ARM::VLD3d16: 2194 case ARM::VLD3d32: 2195 case ARM::VLD3d8_UPD: 2196 case ARM::VLD3d16_UPD: 2197 case ARM::VLD3d32_UPD: 2198 case ARM::VLD4d8: 2199 case ARM::VLD4d16: 2200 case ARM::VLD4d32: 2201 case ARM::VLD4d8_UPD: 2202 case ARM::VLD4d16_UPD: 2203 case ARM::VLD4d32_UPD: 2204 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 2205 return MCDisassembler::Fail; 2206 break; 2207 case ARM::VLD3q8: 2208 case ARM::VLD3q16: 2209 case ARM::VLD3q32: 2210 case ARM::VLD3q8_UPD: 2211 case ARM::VLD3q16_UPD: 2212 case ARM::VLD3q32_UPD: 2213 case ARM::VLD4q8: 2214 case ARM::VLD4q16: 2215 case ARM::VLD4q32: 2216 case ARM::VLD4q8_UPD: 2217 case ARM::VLD4q16_UPD: 2218 case ARM::VLD4q32_UPD: 2219 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2220 return MCDisassembler::Fail; 2221 default: 2222 break; 2223 } 2224 2225 // Third output register 2226 switch(Inst.getOpcode()) { 2227 case ARM::VLD3d8: 2228 case ARM::VLD3d16: 2229 case ARM::VLD3d32: 2230 case ARM::VLD3d8_UPD: 2231 case ARM::VLD3d16_UPD: 2232 case ARM::VLD3d32_UPD: 2233 case ARM::VLD4d8: 2234 case ARM::VLD4d16: 2235 case ARM::VLD4d32: 2236 case ARM::VLD4d8_UPD: 2237 case ARM::VLD4d16_UPD: 2238 case ARM::VLD4d32_UPD: 2239 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2240 return MCDisassembler::Fail; 2241 break; 2242 case ARM::VLD3q8: 2243 case ARM::VLD3q16: 2244 case ARM::VLD3q32: 2245 case ARM::VLD3q8_UPD: 2246 case ARM::VLD3q16_UPD: 2247 case ARM::VLD3q32_UPD: 2248 case ARM::VLD4q8: 2249 case ARM::VLD4q16: 2250 case ARM::VLD4q32: 2251 case ARM::VLD4q8_UPD: 2252 case ARM::VLD4q16_UPD: 2253 case ARM::VLD4q32_UPD: 2254 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) 2255 return MCDisassembler::Fail; 2256 break; 2257 default: 2258 break; 2259 } 2260 2261 // Fourth output register 2262 switch (Inst.getOpcode()) { 2263 case ARM::VLD4d8: 2264 case ARM::VLD4d16: 2265 case ARM::VLD4d32: 2266 case ARM::VLD4d8_UPD: 2267 case ARM::VLD4d16_UPD: 2268 case ARM::VLD4d32_UPD: 2269 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) 2270 return MCDisassembler::Fail; 2271 break; 2272 case ARM::VLD4q8: 2273 case ARM::VLD4q16: 2274 case ARM::VLD4q32: 2275 case ARM::VLD4q8_UPD: 2276 case ARM::VLD4q16_UPD: 2277 case ARM::VLD4q32_UPD: 2278 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) 2279 return MCDisassembler::Fail; 2280 break; 2281 default: 2282 break; 2283 } 2284 2285 // Writeback operand 2286 switch (Inst.getOpcode()) { 2287 case ARM::VLD1d8wb_fixed: 2288 case ARM::VLD1d16wb_fixed: 2289 case ARM::VLD1d32wb_fixed: 2290 case ARM::VLD1d64wb_fixed: 2291 case ARM::VLD1d8wb_register: 2292 case ARM::VLD1d16wb_register: 2293 case ARM::VLD1d32wb_register: 2294 case ARM::VLD1d64wb_register: 2295 case ARM::VLD1q8wb_fixed: 2296 case ARM::VLD1q16wb_fixed: 2297 case ARM::VLD1q32wb_fixed: 2298 case ARM::VLD1q64wb_fixed: 2299 case ARM::VLD1q8wb_register: 2300 case ARM::VLD1q16wb_register: 2301 case ARM::VLD1q32wb_register: 2302 case ARM::VLD1q64wb_register: 2303 case ARM::VLD1d8Twb_fixed: 2304 case ARM::VLD1d8Twb_register: 2305 case ARM::VLD1d16Twb_fixed: 2306 case ARM::VLD1d16Twb_register: 2307 case ARM::VLD1d32Twb_fixed: 2308 case ARM::VLD1d32Twb_register: 2309 case ARM::VLD1d64Twb_fixed: 2310 case ARM::VLD1d64Twb_register: 2311 case ARM::VLD1d8Qwb_fixed: 2312 case ARM::VLD1d8Qwb_register: 2313 case ARM::VLD1d16Qwb_fixed: 2314 case ARM::VLD1d16Qwb_register: 2315 case ARM::VLD1d32Qwb_fixed: 2316 case ARM::VLD1d32Qwb_register: 2317 case ARM::VLD1d64Qwb_fixed: 2318 case ARM::VLD1d64Qwb_register: 2319 case ARM::VLD2d8wb_fixed: 2320 case ARM::VLD2d16wb_fixed: 2321 case ARM::VLD2d32wb_fixed: 2322 case ARM::VLD2q8wb_fixed: 2323 case ARM::VLD2q16wb_fixed: 2324 case ARM::VLD2q32wb_fixed: 2325 case ARM::VLD2d8wb_register: 2326 case ARM::VLD2d16wb_register: 2327 case ARM::VLD2d32wb_register: 2328 case ARM::VLD2q8wb_register: 2329 case ARM::VLD2q16wb_register: 2330 case ARM::VLD2q32wb_register: 2331 case ARM::VLD2b8wb_fixed: 2332 case ARM::VLD2b16wb_fixed: 2333 case ARM::VLD2b32wb_fixed: 2334 case ARM::VLD2b8wb_register: 2335 case ARM::VLD2b16wb_register: 2336 case ARM::VLD2b32wb_register: 2337 Inst.addOperand(MCOperand::CreateImm(0)); 2338 break; 2339 case ARM::VLD3d8_UPD: 2340 case ARM::VLD3d16_UPD: 2341 case ARM::VLD3d32_UPD: 2342 case ARM::VLD3q8_UPD: 2343 case ARM::VLD3q16_UPD: 2344 case ARM::VLD3q32_UPD: 2345 case ARM::VLD4d8_UPD: 2346 case ARM::VLD4d16_UPD: 2347 case ARM::VLD4d32_UPD: 2348 case ARM::VLD4q8_UPD: 2349 case ARM::VLD4q16_UPD: 2350 case ARM::VLD4q32_UPD: 2351 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) 2352 return MCDisassembler::Fail; 2353 break; 2354 default: 2355 break; 2356 } 2357 2358 // AddrMode6 Base (register+alignment) 2359 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) 2360 return MCDisassembler::Fail; 2361 2362 // AddrMode6 Offset (register) 2363 switch (Inst.getOpcode()) { 2364 default: 2365 // The below have been updated to have explicit am6offset split 2366 // between fixed and register offset. For those instructions not 2367 // yet updated, we need to add an additional reg0 operand for the 2368 // fixed variant. 2369 // 2370 // The fixed offset encodes as Rm == 0xd, so we check for that. 2371 if (Rm == 0xd) { 2372 Inst.addOperand(MCOperand::CreateReg(0)); 2373 break; 2374 } 2375 // Fall through to handle the register offset variant. 2376 case ARM::VLD1d8wb_fixed: 2377 case ARM::VLD1d16wb_fixed: 2378 case ARM::VLD1d32wb_fixed: 2379 case ARM::VLD1d64wb_fixed: 2380 case ARM::VLD1d8Twb_fixed: 2381 case ARM::VLD1d16Twb_fixed: 2382 case ARM::VLD1d32Twb_fixed: 2383 case ARM::VLD1d64Twb_fixed: 2384 case ARM::VLD1d8Qwb_fixed: 2385 case ARM::VLD1d16Qwb_fixed: 2386 case ARM::VLD1d32Qwb_fixed: 2387 case ARM::VLD1d64Qwb_fixed: 2388 case ARM::VLD1d8wb_register: 2389 case ARM::VLD1d16wb_register: 2390 case ARM::VLD1d32wb_register: 2391 case ARM::VLD1d64wb_register: 2392 case ARM::VLD1q8wb_fixed: 2393 case ARM::VLD1q16wb_fixed: 2394 case ARM::VLD1q32wb_fixed: 2395 case ARM::VLD1q64wb_fixed: 2396 case ARM::VLD1q8wb_register: 2397 case ARM::VLD1q16wb_register: 2398 case ARM::VLD1q32wb_register: 2399 case ARM::VLD1q64wb_register: 2400 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback 2401 // variant encodes Rm == 0xf. Anything else is a register offset post- 2402 // increment and we need to add the register operand to the instruction. 2403 if (Rm != 0xD && Rm != 0xF && 2404 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2405 return MCDisassembler::Fail; 2406 break; 2407 case ARM::VLD2d8wb_fixed: 2408 case ARM::VLD2d16wb_fixed: 2409 case ARM::VLD2d32wb_fixed: 2410 case ARM::VLD2b8wb_fixed: 2411 case ARM::VLD2b16wb_fixed: 2412 case ARM::VLD2b32wb_fixed: 2413 case ARM::VLD2q8wb_fixed: 2414 case ARM::VLD2q16wb_fixed: 2415 case ARM::VLD2q32wb_fixed: 2416 break; 2417 } 2418 2419 return S; 2420} 2421 2422static DecodeStatus DecodeVSTInstruction(MCInst &Inst, unsigned Insn, 2423 uint64_t Address, const void *Decoder) { 2424 DecodeStatus S = MCDisassembler::Success; 2425 2426 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2427 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2428 unsigned wb = fieldFromInstruction(Insn, 16, 4); 2429 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2430 Rn |= fieldFromInstruction(Insn, 4, 2) << 4; 2431 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2432 2433 // Writeback Operand 2434 switch (Inst.getOpcode()) { 2435 case ARM::VST1d8wb_fixed: 2436 case ARM::VST1d16wb_fixed: 2437 case ARM::VST1d32wb_fixed: 2438 case ARM::VST1d64wb_fixed: 2439 case ARM::VST1d8wb_register: 2440 case ARM::VST1d16wb_register: 2441 case ARM::VST1d32wb_register: 2442 case ARM::VST1d64wb_register: 2443 case ARM::VST1q8wb_fixed: 2444 case ARM::VST1q16wb_fixed: 2445 case ARM::VST1q32wb_fixed: 2446 case ARM::VST1q64wb_fixed: 2447 case ARM::VST1q8wb_register: 2448 case ARM::VST1q16wb_register: 2449 case ARM::VST1q32wb_register: 2450 case ARM::VST1q64wb_register: 2451 case ARM::VST1d8Twb_fixed: 2452 case ARM::VST1d16Twb_fixed: 2453 case ARM::VST1d32Twb_fixed: 2454 case ARM::VST1d64Twb_fixed: 2455 case ARM::VST1d8Twb_register: 2456 case ARM::VST1d16Twb_register: 2457 case ARM::VST1d32Twb_register: 2458 case ARM::VST1d64Twb_register: 2459 case ARM::VST1d8Qwb_fixed: 2460 case ARM::VST1d16Qwb_fixed: 2461 case ARM::VST1d32Qwb_fixed: 2462 case ARM::VST1d64Qwb_fixed: 2463 case ARM::VST1d8Qwb_register: 2464 case ARM::VST1d16Qwb_register: 2465 case ARM::VST1d32Qwb_register: 2466 case ARM::VST1d64Qwb_register: 2467 case ARM::VST2d8wb_fixed: 2468 case ARM::VST2d16wb_fixed: 2469 case ARM::VST2d32wb_fixed: 2470 case ARM::VST2d8wb_register: 2471 case ARM::VST2d16wb_register: 2472 case ARM::VST2d32wb_register: 2473 case ARM::VST2q8wb_fixed: 2474 case ARM::VST2q16wb_fixed: 2475 case ARM::VST2q32wb_fixed: 2476 case ARM::VST2q8wb_register: 2477 case ARM::VST2q16wb_register: 2478 case ARM::VST2q32wb_register: 2479 case ARM::VST2b8wb_fixed: 2480 case ARM::VST2b16wb_fixed: 2481 case ARM::VST2b32wb_fixed: 2482 case ARM::VST2b8wb_register: 2483 case ARM::VST2b16wb_register: 2484 case ARM::VST2b32wb_register: 2485 if (Rm == 0xF) 2486 return MCDisassembler::Fail; 2487 Inst.addOperand(MCOperand::CreateImm(0)); 2488 break; 2489 case ARM::VST3d8_UPD: 2490 case ARM::VST3d16_UPD: 2491 case ARM::VST3d32_UPD: 2492 case ARM::VST3q8_UPD: 2493 case ARM::VST3q16_UPD: 2494 case ARM::VST3q32_UPD: 2495 case ARM::VST4d8_UPD: 2496 case ARM::VST4d16_UPD: 2497 case ARM::VST4d32_UPD: 2498 case ARM::VST4q8_UPD: 2499 case ARM::VST4q16_UPD: 2500 case ARM::VST4q32_UPD: 2501 if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) 2502 return MCDisassembler::Fail; 2503 break; 2504 default: 2505 break; 2506 } 2507 2508 // AddrMode6 Base (register+alignment) 2509 if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) 2510 return MCDisassembler::Fail; 2511 2512 // AddrMode6 Offset (register) 2513 switch (Inst.getOpcode()) { 2514 default: 2515 if (Rm == 0xD) 2516 Inst.addOperand(MCOperand::CreateReg(0)); 2517 else if (Rm != 0xF) { 2518 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2519 return MCDisassembler::Fail; 2520 } 2521 break; 2522 case ARM::VST1d8wb_fixed: 2523 case ARM::VST1d16wb_fixed: 2524 case ARM::VST1d32wb_fixed: 2525 case ARM::VST1d64wb_fixed: 2526 case ARM::VST1q8wb_fixed: 2527 case ARM::VST1q16wb_fixed: 2528 case ARM::VST1q32wb_fixed: 2529 case ARM::VST1q64wb_fixed: 2530 case ARM::VST1d8Twb_fixed: 2531 case ARM::VST1d16Twb_fixed: 2532 case ARM::VST1d32Twb_fixed: 2533 case ARM::VST1d64Twb_fixed: 2534 case ARM::VST1d8Qwb_fixed: 2535 case ARM::VST1d16Qwb_fixed: 2536 case ARM::VST1d32Qwb_fixed: 2537 case ARM::VST1d64Qwb_fixed: 2538 case ARM::VST2d8wb_fixed: 2539 case ARM::VST2d16wb_fixed: 2540 case ARM::VST2d32wb_fixed: 2541 case ARM::VST2q8wb_fixed: 2542 case ARM::VST2q16wb_fixed: 2543 case ARM::VST2q32wb_fixed: 2544 case ARM::VST2b8wb_fixed: 2545 case ARM::VST2b16wb_fixed: 2546 case ARM::VST2b32wb_fixed: 2547 break; 2548 } 2549 2550 2551 // First input register 2552 switch (Inst.getOpcode()) { 2553 case ARM::VST1q16: 2554 case ARM::VST1q32: 2555 case ARM::VST1q64: 2556 case ARM::VST1q8: 2557 case ARM::VST1q16wb_fixed: 2558 case ARM::VST1q16wb_register: 2559 case ARM::VST1q32wb_fixed: 2560 case ARM::VST1q32wb_register: 2561 case ARM::VST1q64wb_fixed: 2562 case ARM::VST1q64wb_register: 2563 case ARM::VST1q8wb_fixed: 2564 case ARM::VST1q8wb_register: 2565 case ARM::VST2d16: 2566 case ARM::VST2d32: 2567 case ARM::VST2d8: 2568 case ARM::VST2d16wb_fixed: 2569 case ARM::VST2d16wb_register: 2570 case ARM::VST2d32wb_fixed: 2571 case ARM::VST2d32wb_register: 2572 case ARM::VST2d8wb_fixed: 2573 case ARM::VST2d8wb_register: 2574 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) 2575 return MCDisassembler::Fail; 2576 break; 2577 case ARM::VST2b16: 2578 case ARM::VST2b32: 2579 case ARM::VST2b8: 2580 case ARM::VST2b16wb_fixed: 2581 case ARM::VST2b16wb_register: 2582 case ARM::VST2b32wb_fixed: 2583 case ARM::VST2b32wb_register: 2584 case ARM::VST2b8wb_fixed: 2585 case ARM::VST2b8wb_register: 2586 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder))) 2587 return MCDisassembler::Fail; 2588 break; 2589 default: 2590 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2591 return MCDisassembler::Fail; 2592 } 2593 2594 // Second input register 2595 switch (Inst.getOpcode()) { 2596 case ARM::VST3d8: 2597 case ARM::VST3d16: 2598 case ARM::VST3d32: 2599 case ARM::VST3d8_UPD: 2600 case ARM::VST3d16_UPD: 2601 case ARM::VST3d32_UPD: 2602 case ARM::VST4d8: 2603 case ARM::VST4d16: 2604 case ARM::VST4d32: 2605 case ARM::VST4d8_UPD: 2606 case ARM::VST4d16_UPD: 2607 case ARM::VST4d32_UPD: 2608 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) 2609 return MCDisassembler::Fail; 2610 break; 2611 case ARM::VST3q8: 2612 case ARM::VST3q16: 2613 case ARM::VST3q32: 2614 case ARM::VST3q8_UPD: 2615 case ARM::VST3q16_UPD: 2616 case ARM::VST3q32_UPD: 2617 case ARM::VST4q8: 2618 case ARM::VST4q16: 2619 case ARM::VST4q32: 2620 case ARM::VST4q8_UPD: 2621 case ARM::VST4q16_UPD: 2622 case ARM::VST4q32_UPD: 2623 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2624 return MCDisassembler::Fail; 2625 break; 2626 default: 2627 break; 2628 } 2629 2630 // Third input register 2631 switch (Inst.getOpcode()) { 2632 case ARM::VST3d8: 2633 case ARM::VST3d16: 2634 case ARM::VST3d32: 2635 case ARM::VST3d8_UPD: 2636 case ARM::VST3d16_UPD: 2637 case ARM::VST3d32_UPD: 2638 case ARM::VST4d8: 2639 case ARM::VST4d16: 2640 case ARM::VST4d32: 2641 case ARM::VST4d8_UPD: 2642 case ARM::VST4d16_UPD: 2643 case ARM::VST4d32_UPD: 2644 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) 2645 return MCDisassembler::Fail; 2646 break; 2647 case ARM::VST3q8: 2648 case ARM::VST3q16: 2649 case ARM::VST3q32: 2650 case ARM::VST3q8_UPD: 2651 case ARM::VST3q16_UPD: 2652 case ARM::VST3q32_UPD: 2653 case ARM::VST4q8: 2654 case ARM::VST4q16: 2655 case ARM::VST4q32: 2656 case ARM::VST4q8_UPD: 2657 case ARM::VST4q16_UPD: 2658 case ARM::VST4q32_UPD: 2659 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) 2660 return MCDisassembler::Fail; 2661 break; 2662 default: 2663 break; 2664 } 2665 2666 // Fourth input register 2667 switch (Inst.getOpcode()) { 2668 case ARM::VST4d8: 2669 case ARM::VST4d16: 2670 case ARM::VST4d32: 2671 case ARM::VST4d8_UPD: 2672 case ARM::VST4d16_UPD: 2673 case ARM::VST4d32_UPD: 2674 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) 2675 return MCDisassembler::Fail; 2676 break; 2677 case ARM::VST4q8: 2678 case ARM::VST4q16: 2679 case ARM::VST4q32: 2680 case ARM::VST4q8_UPD: 2681 case ARM::VST4q16_UPD: 2682 case ARM::VST4q32_UPD: 2683 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) 2684 return MCDisassembler::Fail; 2685 break; 2686 default: 2687 break; 2688 } 2689 2690 return S; 2691} 2692 2693static DecodeStatus DecodeVLD1DupInstruction(MCInst &Inst, unsigned Insn, 2694 uint64_t Address, const void *Decoder) { 2695 DecodeStatus S = MCDisassembler::Success; 2696 2697 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2698 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2699 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2700 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2701 unsigned align = fieldFromInstruction(Insn, 4, 1); 2702 unsigned size = fieldFromInstruction(Insn, 6, 2); 2703 2704 align *= (1 << size); 2705 2706 switch (Inst.getOpcode()) { 2707 case ARM::VLD1DUPq16: case ARM::VLD1DUPq32: case ARM::VLD1DUPq8: 2708 case ARM::VLD1DUPq16wb_fixed: case ARM::VLD1DUPq16wb_register: 2709 case ARM::VLD1DUPq32wb_fixed: case ARM::VLD1DUPq32wb_register: 2710 case ARM::VLD1DUPq8wb_fixed: case ARM::VLD1DUPq8wb_register: 2711 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) 2712 return MCDisassembler::Fail; 2713 break; 2714 default: 2715 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2716 return MCDisassembler::Fail; 2717 break; 2718 } 2719 if (Rm != 0xF) { 2720 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2721 return MCDisassembler::Fail; 2722 } 2723 2724 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2725 return MCDisassembler::Fail; 2726 Inst.addOperand(MCOperand::CreateImm(align)); 2727 2728 // The fixed offset post-increment encodes Rm == 0xd. The no-writeback 2729 // variant encodes Rm == 0xf. Anything else is a register offset post- 2730 // increment and we need to add the register operand to the instruction. 2731 if (Rm != 0xD && Rm != 0xF && 2732 !Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2733 return MCDisassembler::Fail; 2734 2735 return S; 2736} 2737 2738static DecodeStatus DecodeVLD2DupInstruction(MCInst &Inst, unsigned Insn, 2739 uint64_t Address, const void *Decoder) { 2740 DecodeStatus S = MCDisassembler::Success; 2741 2742 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2743 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2744 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2745 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2746 unsigned align = fieldFromInstruction(Insn, 4, 1); 2747 unsigned size = 1 << fieldFromInstruction(Insn, 6, 2); 2748 align *= 2*size; 2749 2750 switch (Inst.getOpcode()) { 2751 case ARM::VLD2DUPd16: case ARM::VLD2DUPd32: case ARM::VLD2DUPd8: 2752 case ARM::VLD2DUPd16wb_fixed: case ARM::VLD2DUPd16wb_register: 2753 case ARM::VLD2DUPd32wb_fixed: case ARM::VLD2DUPd32wb_register: 2754 case ARM::VLD2DUPd8wb_fixed: case ARM::VLD2DUPd8wb_register: 2755 if (!Check(S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) 2756 return MCDisassembler::Fail; 2757 break; 2758 case ARM::VLD2DUPd16x2: case ARM::VLD2DUPd32x2: case ARM::VLD2DUPd8x2: 2759 case ARM::VLD2DUPd16x2wb_fixed: case ARM::VLD2DUPd16x2wb_register: 2760 case ARM::VLD2DUPd32x2wb_fixed: case ARM::VLD2DUPd32x2wb_register: 2761 case ARM::VLD2DUPd8x2wb_fixed: case ARM::VLD2DUPd8x2wb_register: 2762 if (!Check(S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder))) 2763 return MCDisassembler::Fail; 2764 break; 2765 default: 2766 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2767 return MCDisassembler::Fail; 2768 break; 2769 } 2770 2771 if (Rm != 0xF) 2772 Inst.addOperand(MCOperand::CreateImm(0)); 2773 2774 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2775 return MCDisassembler::Fail; 2776 Inst.addOperand(MCOperand::CreateImm(align)); 2777 2778 if (Rm != 0xD && Rm != 0xF) { 2779 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2780 return MCDisassembler::Fail; 2781 } 2782 2783 return S; 2784} 2785 2786static DecodeStatus DecodeVLD3DupInstruction(MCInst &Inst, unsigned Insn, 2787 uint64_t Address, const void *Decoder) { 2788 DecodeStatus S = MCDisassembler::Success; 2789 2790 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2791 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2792 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2793 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2794 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1; 2795 2796 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2797 return MCDisassembler::Fail; 2798 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 2799 return MCDisassembler::Fail; 2800 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) 2801 return MCDisassembler::Fail; 2802 if (Rm != 0xF) { 2803 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2804 return MCDisassembler::Fail; 2805 } 2806 2807 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2808 return MCDisassembler::Fail; 2809 Inst.addOperand(MCOperand::CreateImm(0)); 2810 2811 if (Rm == 0xD) 2812 Inst.addOperand(MCOperand::CreateReg(0)); 2813 else if (Rm != 0xF) { 2814 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2815 return MCDisassembler::Fail; 2816 } 2817 2818 return S; 2819} 2820 2821static DecodeStatus DecodeVLD4DupInstruction(MCInst &Inst, unsigned Insn, 2822 uint64_t Address, const void *Decoder) { 2823 DecodeStatus S = MCDisassembler::Success; 2824 2825 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2826 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2827 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2828 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2829 unsigned size = fieldFromInstruction(Insn, 6, 2); 2830 unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1; 2831 unsigned align = fieldFromInstruction(Insn, 4, 1); 2832 2833 if (size == 0x3) { 2834 size = 4; 2835 align = 16; 2836 } else { 2837 if (size == 2) { 2838 size = 1 << size; 2839 align *= 8; 2840 } else { 2841 size = 1 << size; 2842 align *= 4*size; 2843 } 2844 } 2845 2846 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2847 return MCDisassembler::Fail; 2848 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) 2849 return MCDisassembler::Fail; 2850 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) 2851 return MCDisassembler::Fail; 2852 if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder))) 2853 return MCDisassembler::Fail; 2854 if (Rm != 0xF) { 2855 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2856 return MCDisassembler::Fail; 2857 } 2858 2859 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 2860 return MCDisassembler::Fail; 2861 Inst.addOperand(MCOperand::CreateImm(align)); 2862 2863 if (Rm == 0xD) 2864 Inst.addOperand(MCOperand::CreateReg(0)); 2865 else if (Rm != 0xF) { 2866 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 2867 return MCDisassembler::Fail; 2868 } 2869 2870 return S; 2871} 2872 2873static DecodeStatus 2874DecodeNEONModImmInstruction(MCInst &Inst, unsigned Insn, 2875 uint64_t Address, const void *Decoder) { 2876 DecodeStatus S = MCDisassembler::Success; 2877 2878 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2879 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2880 unsigned imm = fieldFromInstruction(Insn, 0, 4); 2881 imm |= fieldFromInstruction(Insn, 16, 3) << 4; 2882 imm |= fieldFromInstruction(Insn, 24, 1) << 7; 2883 imm |= fieldFromInstruction(Insn, 8, 4) << 8; 2884 imm |= fieldFromInstruction(Insn, 5, 1) << 12; 2885 unsigned Q = fieldFromInstruction(Insn, 6, 1); 2886 2887 if (Q) { 2888 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 2889 return MCDisassembler::Fail; 2890 } else { 2891 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2892 return MCDisassembler::Fail; 2893 } 2894 2895 Inst.addOperand(MCOperand::CreateImm(imm)); 2896 2897 switch (Inst.getOpcode()) { 2898 case ARM::VORRiv4i16: 2899 case ARM::VORRiv2i32: 2900 case ARM::VBICiv4i16: 2901 case ARM::VBICiv2i32: 2902 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2903 return MCDisassembler::Fail; 2904 break; 2905 case ARM::VORRiv8i16: 2906 case ARM::VORRiv4i32: 2907 case ARM::VBICiv8i16: 2908 case ARM::VBICiv4i32: 2909 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 2910 return MCDisassembler::Fail; 2911 break; 2912 default: 2913 break; 2914 } 2915 2916 return S; 2917} 2918 2919static DecodeStatus DecodeVSHLMaxInstruction(MCInst &Inst, unsigned Insn, 2920 uint64_t Address, const void *Decoder) { 2921 DecodeStatus S = MCDisassembler::Success; 2922 2923 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2924 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2925 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2926 Rm |= fieldFromInstruction(Insn, 5, 1) << 4; 2927 unsigned size = fieldFromInstruction(Insn, 18, 2); 2928 2929 if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) 2930 return MCDisassembler::Fail; 2931 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) 2932 return MCDisassembler::Fail; 2933 Inst.addOperand(MCOperand::CreateImm(8 << size)); 2934 2935 return S; 2936} 2937 2938static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val, 2939 uint64_t Address, const void *Decoder) { 2940 Inst.addOperand(MCOperand::CreateImm(8 - Val)); 2941 return MCDisassembler::Success; 2942} 2943 2944static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val, 2945 uint64_t Address, const void *Decoder) { 2946 Inst.addOperand(MCOperand::CreateImm(16 - Val)); 2947 return MCDisassembler::Success; 2948} 2949 2950static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val, 2951 uint64_t Address, const void *Decoder) { 2952 Inst.addOperand(MCOperand::CreateImm(32 - Val)); 2953 return MCDisassembler::Success; 2954} 2955 2956static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val, 2957 uint64_t Address, const void *Decoder) { 2958 Inst.addOperand(MCOperand::CreateImm(64 - Val)); 2959 return MCDisassembler::Success; 2960} 2961 2962static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn, 2963 uint64_t Address, const void *Decoder) { 2964 DecodeStatus S = MCDisassembler::Success; 2965 2966 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 2967 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 2968 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 2969 Rn |= fieldFromInstruction(Insn, 7, 1) << 4; 2970 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 2971 Rm |= fieldFromInstruction(Insn, 5, 1) << 4; 2972 unsigned op = fieldFromInstruction(Insn, 6, 1); 2973 2974 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2975 return MCDisassembler::Fail; 2976 if (op) { 2977 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 2978 return MCDisassembler::Fail; // Writeback 2979 } 2980 2981 switch (Inst.getOpcode()) { 2982 case ARM::VTBL2: 2983 case ARM::VTBX2: 2984 if (!Check(S, DecodeDPairRegisterClass(Inst, Rn, Address, Decoder))) 2985 return MCDisassembler::Fail; 2986 break; 2987 default: 2988 if (!Check(S, DecodeDPRRegisterClass(Inst, Rn, Address, Decoder))) 2989 return MCDisassembler::Fail; 2990 } 2991 2992 if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) 2993 return MCDisassembler::Fail; 2994 2995 return S; 2996} 2997 2998static DecodeStatus DecodeThumbAddSpecialReg(MCInst &Inst, uint16_t Insn, 2999 uint64_t Address, const void *Decoder) { 3000 DecodeStatus S = MCDisassembler::Success; 3001 3002 unsigned dst = fieldFromInstruction(Insn, 8, 3); 3003 unsigned imm = fieldFromInstruction(Insn, 0, 8); 3004 3005 if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder))) 3006 return MCDisassembler::Fail; 3007 3008 switch(Inst.getOpcode()) { 3009 default: 3010 return MCDisassembler::Fail; 3011 case ARM::tADR: 3012 break; // tADR does not explicitly represent the PC as an operand. 3013 case ARM::tADDrSPi: 3014 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3015 break; 3016 } 3017 3018 Inst.addOperand(MCOperand::CreateImm(imm)); 3019 return S; 3020} 3021 3022static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val, 3023 uint64_t Address, const void *Decoder) { 3024 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<12>(Val<<1) + 4, 3025 true, 2, Inst, Decoder)) 3026 Inst.addOperand(MCOperand::CreateImm(SignExtend32<12>(Val << 1))); 3027 return MCDisassembler::Success; 3028} 3029 3030static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val, 3031 uint64_t Address, const void *Decoder) { 3032 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<21>(Val) + 4, 3033 true, 4, Inst, Decoder)) 3034 Inst.addOperand(MCOperand::CreateImm(SignExtend32<21>(Val))); 3035 return MCDisassembler::Success; 3036} 3037 3038static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val, 3039 uint64_t Address, const void *Decoder) { 3040 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<7>(Val<<1) + 4, 3041 true, 2, Inst, Decoder)) 3042 Inst.addOperand(MCOperand::CreateImm(SignExtend32<7>(Val << 1))); 3043 return MCDisassembler::Success; 3044} 3045 3046static DecodeStatus DecodeThumbAddrModeRR(MCInst &Inst, unsigned Val, 3047 uint64_t Address, const void *Decoder) { 3048 DecodeStatus S = MCDisassembler::Success; 3049 3050 unsigned Rn = fieldFromInstruction(Val, 0, 3); 3051 unsigned Rm = fieldFromInstruction(Val, 3, 3); 3052 3053 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) 3054 return MCDisassembler::Fail; 3055 if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder))) 3056 return MCDisassembler::Fail; 3057 3058 return S; 3059} 3060 3061static DecodeStatus DecodeThumbAddrModeIS(MCInst &Inst, unsigned Val, 3062 uint64_t Address, const void *Decoder) { 3063 DecodeStatus S = MCDisassembler::Success; 3064 3065 unsigned Rn = fieldFromInstruction(Val, 0, 3); 3066 unsigned imm = fieldFromInstruction(Val, 3, 5); 3067 3068 if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) 3069 return MCDisassembler::Fail; 3070 Inst.addOperand(MCOperand::CreateImm(imm)); 3071 3072 return S; 3073} 3074 3075static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val, 3076 uint64_t Address, const void *Decoder) { 3077 unsigned imm = Val << 2; 3078 3079 Inst.addOperand(MCOperand::CreateImm(imm)); 3080 tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder); 3081 3082 return MCDisassembler::Success; 3083} 3084 3085static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val, 3086 uint64_t Address, const void *Decoder) { 3087 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3088 Inst.addOperand(MCOperand::CreateImm(Val)); 3089 3090 return MCDisassembler::Success; 3091} 3092 3093static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val, 3094 uint64_t Address, const void *Decoder) { 3095 DecodeStatus S = MCDisassembler::Success; 3096 3097 unsigned Rn = fieldFromInstruction(Val, 6, 4); 3098 unsigned Rm = fieldFromInstruction(Val, 2, 4); 3099 unsigned imm = fieldFromInstruction(Val, 0, 2); 3100 3101 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3102 return MCDisassembler::Fail; 3103 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) 3104 return MCDisassembler::Fail; 3105 Inst.addOperand(MCOperand::CreateImm(imm)); 3106 3107 return S; 3108} 3109 3110static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Insn, 3111 uint64_t Address, const void *Decoder) { 3112 DecodeStatus S = MCDisassembler::Success; 3113 3114 switch (Inst.getOpcode()) { 3115 case ARM::t2PLDs: 3116 case ARM::t2PLDWs: 3117 case ARM::t2PLIs: 3118 break; 3119 default: { 3120 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3121 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 3122 return MCDisassembler::Fail; 3123 } 3124 } 3125 3126 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3127 if (Rn == 0xF) { 3128 switch (Inst.getOpcode()) { 3129 case ARM::t2LDRBs: 3130 Inst.setOpcode(ARM::t2LDRBpci); 3131 break; 3132 case ARM::t2LDRHs: 3133 Inst.setOpcode(ARM::t2LDRHpci); 3134 break; 3135 case ARM::t2LDRSHs: 3136 Inst.setOpcode(ARM::t2LDRSHpci); 3137 break; 3138 case ARM::t2LDRSBs: 3139 Inst.setOpcode(ARM::t2LDRSBpci); 3140 break; 3141 case ARM::t2PLDs: 3142 Inst.setOpcode(ARM::t2PLDi12); 3143 Inst.addOperand(MCOperand::CreateReg(ARM::PC)); 3144 break; 3145 default: 3146 return MCDisassembler::Fail; 3147 } 3148 3149 int imm = fieldFromInstruction(Insn, 0, 12); 3150 if (!fieldFromInstruction(Insn, 23, 1)) imm *= -1; 3151 Inst.addOperand(MCOperand::CreateImm(imm)); 3152 3153 return S; 3154 } 3155 3156 unsigned addrmode = fieldFromInstruction(Insn, 4, 2); 3157 addrmode |= fieldFromInstruction(Insn, 0, 4) << 2; 3158 addrmode |= fieldFromInstruction(Insn, 16, 4) << 6; 3159 if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder))) 3160 return MCDisassembler::Fail; 3161 3162 return S; 3163} 3164 3165static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val, 3166 uint64_t Address, const void *Decoder) { 3167 if (Val == 0) 3168 Inst.addOperand(MCOperand::CreateImm(INT32_MIN)); 3169 else { 3170 int imm = Val & 0xFF; 3171 3172 if (!(Val & 0x100)) imm *= -1; 3173 Inst.addOperand(MCOperand::CreateImm(imm << 2)); 3174 } 3175 3176 return MCDisassembler::Success; 3177} 3178 3179static DecodeStatus DecodeT2AddrModeImm8s4(MCInst &Inst, unsigned Val, 3180 uint64_t Address, const void *Decoder) { 3181 DecodeStatus S = MCDisassembler::Success; 3182 3183 unsigned Rn = fieldFromInstruction(Val, 9, 4); 3184 unsigned imm = fieldFromInstruction(Val, 0, 9); 3185 3186 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3187 return MCDisassembler::Fail; 3188 if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder))) 3189 return MCDisassembler::Fail; 3190 3191 return S; 3192} 3193 3194static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst &Inst,unsigned Val, 3195 uint64_t Address, const void *Decoder) { 3196 DecodeStatus S = MCDisassembler::Success; 3197 3198 unsigned Rn = fieldFromInstruction(Val, 8, 4); 3199 unsigned imm = fieldFromInstruction(Val, 0, 8); 3200 3201 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 3202 return MCDisassembler::Fail; 3203 3204 Inst.addOperand(MCOperand::CreateImm(imm)); 3205 3206 return S; 3207} 3208 3209static DecodeStatus DecodeT2Imm8(MCInst &Inst, unsigned Val, 3210 uint64_t Address, const void *Decoder) { 3211 int imm = Val & 0xFF; 3212 if (Val == 0) 3213 imm = INT32_MIN; 3214 else if (!(Val & 0x100)) 3215 imm *= -1; 3216 Inst.addOperand(MCOperand::CreateImm(imm)); 3217 3218 return MCDisassembler::Success; 3219} 3220 3221 3222static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val, 3223 uint64_t Address, const void *Decoder) { 3224 DecodeStatus S = MCDisassembler::Success; 3225 3226 unsigned Rn = fieldFromInstruction(Val, 9, 4); 3227 unsigned imm = fieldFromInstruction(Val, 0, 9); 3228 3229 // Some instructions always use an additive offset. 3230 switch (Inst.getOpcode()) { 3231 case ARM::t2LDRT: 3232 case ARM::t2LDRBT: 3233 case ARM::t2LDRHT: 3234 case ARM::t2LDRSBT: 3235 case ARM::t2LDRSHT: 3236 case ARM::t2STRT: 3237 case ARM::t2STRBT: 3238 case ARM::t2STRHT: 3239 imm |= 0x100; 3240 break; 3241 default: 3242 break; 3243 } 3244 3245 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3246 return MCDisassembler::Fail; 3247 if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder))) 3248 return MCDisassembler::Fail; 3249 3250 return S; 3251} 3252 3253static DecodeStatus DecodeT2LdStPre(MCInst &Inst, unsigned Insn, 3254 uint64_t Address, const void *Decoder) { 3255 DecodeStatus S = MCDisassembler::Success; 3256 3257 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3258 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3259 unsigned addr = fieldFromInstruction(Insn, 0, 8); 3260 addr |= fieldFromInstruction(Insn, 9, 1) << 8; 3261 addr |= Rn << 9; 3262 unsigned load = fieldFromInstruction(Insn, 20, 1); 3263 3264 if (!load) { 3265 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3266 return MCDisassembler::Fail; 3267 } 3268 3269 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 3270 return MCDisassembler::Fail; 3271 3272 if (load) { 3273 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3274 return MCDisassembler::Fail; 3275 } 3276 3277 if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder))) 3278 return MCDisassembler::Fail; 3279 3280 return S; 3281} 3282 3283static DecodeStatus DecodeT2AddrModeImm12(MCInst &Inst, unsigned Val, 3284 uint64_t Address, const void *Decoder) { 3285 DecodeStatus S = MCDisassembler::Success; 3286 3287 unsigned Rn = fieldFromInstruction(Val, 13, 4); 3288 unsigned imm = fieldFromInstruction(Val, 0, 12); 3289 3290 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3291 return MCDisassembler::Fail; 3292 Inst.addOperand(MCOperand::CreateImm(imm)); 3293 3294 return S; 3295} 3296 3297 3298static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Insn, 3299 uint64_t Address, const void *Decoder) { 3300 unsigned imm = fieldFromInstruction(Insn, 0, 7); 3301 3302 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3303 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3304 Inst.addOperand(MCOperand::CreateImm(imm)); 3305 3306 return MCDisassembler::Success; 3307} 3308 3309static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn, 3310 uint64_t Address, const void *Decoder) { 3311 DecodeStatus S = MCDisassembler::Success; 3312 3313 if (Inst.getOpcode() == ARM::tADDrSP) { 3314 unsigned Rdm = fieldFromInstruction(Insn, 0, 3); 3315 Rdm |= fieldFromInstruction(Insn, 7, 1) << 3; 3316 3317 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) 3318 return MCDisassembler::Fail; 3319 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3320 if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) 3321 return MCDisassembler::Fail; 3322 } else if (Inst.getOpcode() == ARM::tADDspr) { 3323 unsigned Rm = fieldFromInstruction(Insn, 3, 4); 3324 3325 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3326 Inst.addOperand(MCOperand::CreateReg(ARM::SP)); 3327 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3328 return MCDisassembler::Fail; 3329 } 3330 3331 return S; 3332} 3333 3334static DecodeStatus DecodeThumbCPS(MCInst &Inst, uint16_t Insn, 3335 uint64_t Address, const void *Decoder) { 3336 unsigned imod = fieldFromInstruction(Insn, 4, 1) | 0x2; 3337 unsigned flags = fieldFromInstruction(Insn, 0, 3); 3338 3339 Inst.addOperand(MCOperand::CreateImm(imod)); 3340 Inst.addOperand(MCOperand::CreateImm(flags)); 3341 3342 return MCDisassembler::Success; 3343} 3344 3345static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn, 3346 uint64_t Address, const void *Decoder) { 3347 DecodeStatus S = MCDisassembler::Success; 3348 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3349 unsigned add = fieldFromInstruction(Insn, 4, 1); 3350 3351 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) 3352 return MCDisassembler::Fail; 3353 Inst.addOperand(MCOperand::CreateImm(add)); 3354 3355 return S; 3356} 3357 3358static DecodeStatus DecodeThumbBLXOffset(MCInst &Inst, unsigned Val, 3359 uint64_t Address, const void *Decoder) { 3360 // Val is passed in as S:J1:J2:imm10H:imm10L:'0' 3361 // Note only one trailing zero not two. Also the J1 and J2 values are from 3362 // the encoded instruction. So here change to I1 and I2 values via: 3363 // I1 = NOT(J1 EOR S); 3364 // I2 = NOT(J2 EOR S); 3365 // and build the imm32 with two trailing zeros as documented: 3366 // imm32 = SignExtend(S:I1:I2:imm10H:imm10L:'00', 32); 3367 unsigned S = (Val >> 23) & 1; 3368 unsigned J1 = (Val >> 22) & 1; 3369 unsigned J2 = (Val >> 21) & 1; 3370 unsigned I1 = !(J1 ^ S); 3371 unsigned I2 = !(J2 ^ S); 3372 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21); 3373 int imm32 = SignExtend32<25>(tmp << 1); 3374 3375 if (!tryAddingSymbolicOperand(Address, 3376 (Address & ~2u) + imm32 + 4, 3377 true, 4, Inst, Decoder)) 3378 Inst.addOperand(MCOperand::CreateImm(imm32)); 3379 return MCDisassembler::Success; 3380} 3381 3382static DecodeStatus DecodeCoprocessor(MCInst &Inst, unsigned Val, 3383 uint64_t Address, const void *Decoder) { 3384 if (Val == 0xA || Val == 0xB) 3385 return MCDisassembler::Fail; 3386 3387 Inst.addOperand(MCOperand::CreateImm(Val)); 3388 return MCDisassembler::Success; 3389} 3390 3391static DecodeStatus 3392DecodeThumbTableBranch(MCInst &Inst, unsigned Insn, 3393 uint64_t Address, const void *Decoder) { 3394 DecodeStatus S = MCDisassembler::Success; 3395 3396 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3397 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3398 3399 if (Rn == ARM::SP) S = MCDisassembler::SoftFail; 3400 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3401 return MCDisassembler::Fail; 3402 if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) 3403 return MCDisassembler::Fail; 3404 return S; 3405} 3406 3407static DecodeStatus 3408DecodeThumb2BCCInstruction(MCInst &Inst, unsigned Insn, 3409 uint64_t Address, const void *Decoder) { 3410 DecodeStatus S = MCDisassembler::Success; 3411 3412 unsigned pred = fieldFromInstruction(Insn, 22, 4); 3413 if (pred == 0xE || pred == 0xF) { 3414 unsigned opc = fieldFromInstruction(Insn, 4, 28); 3415 switch (opc) { 3416 default: 3417 return MCDisassembler::Fail; 3418 case 0xf3bf8f4: 3419 Inst.setOpcode(ARM::t2DSB); 3420 break; 3421 case 0xf3bf8f5: 3422 Inst.setOpcode(ARM::t2DMB); 3423 break; 3424 case 0xf3bf8f6: 3425 Inst.setOpcode(ARM::t2ISB); 3426 break; 3427 } 3428 3429 unsigned imm = fieldFromInstruction(Insn, 0, 4); 3430 return DecodeMemBarrierOption(Inst, imm, Address, Decoder); 3431 } 3432 3433 unsigned brtarget = fieldFromInstruction(Insn, 0, 11) << 1; 3434 brtarget |= fieldFromInstruction(Insn, 11, 1) << 19; 3435 brtarget |= fieldFromInstruction(Insn, 13, 1) << 18; 3436 brtarget |= fieldFromInstruction(Insn, 16, 6) << 12; 3437 brtarget |= fieldFromInstruction(Insn, 26, 1) << 20; 3438 3439 if (!Check(S, DecodeT2BROperand(Inst, brtarget, Address, Decoder))) 3440 return MCDisassembler::Fail; 3441 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3442 return MCDisassembler::Fail; 3443 3444 return S; 3445} 3446 3447// Decode a shifted immediate operand. These basically consist 3448// of an 8-bit value, and a 4-bit directive that specifies either 3449// a splat operation or a rotation. 3450static DecodeStatus DecodeT2SOImm(MCInst &Inst, unsigned Val, 3451 uint64_t Address, const void *Decoder) { 3452 unsigned ctrl = fieldFromInstruction(Val, 10, 2); 3453 if (ctrl == 0) { 3454 unsigned byte = fieldFromInstruction(Val, 8, 2); 3455 unsigned imm = fieldFromInstruction(Val, 0, 8); 3456 switch (byte) { 3457 case 0: 3458 Inst.addOperand(MCOperand::CreateImm(imm)); 3459 break; 3460 case 1: 3461 Inst.addOperand(MCOperand::CreateImm((imm << 16) | imm)); 3462 break; 3463 case 2: 3464 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 8))); 3465 break; 3466 case 3: 3467 Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 16) | 3468 (imm << 8) | imm)); 3469 break; 3470 } 3471 } else { 3472 unsigned unrot = fieldFromInstruction(Val, 0, 7) | 0x80; 3473 unsigned rot = fieldFromInstruction(Val, 7, 5); 3474 unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31)); 3475 Inst.addOperand(MCOperand::CreateImm(imm)); 3476 } 3477 3478 return MCDisassembler::Success; 3479} 3480 3481static DecodeStatus 3482DecodeThumbBCCTargetOperand(MCInst &Inst, unsigned Val, 3483 uint64_t Address, const void *Decoder){ 3484 if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<9>(Val<<1) + 4, 3485 true, 2, Inst, Decoder)) 3486 Inst.addOperand(MCOperand::CreateImm(SignExtend32<9>(Val << 1))); 3487 return MCDisassembler::Success; 3488} 3489 3490static DecodeStatus DecodeThumbBLTargetOperand(MCInst &Inst, unsigned Val, 3491 uint64_t Address, const void *Decoder){ 3492 // Val is passed in as S:J1:J2:imm10:imm11 3493 // Note no trailing zero after imm11. Also the J1 and J2 values are from 3494 // the encoded instruction. So here change to I1 and I2 values via: 3495 // I1 = NOT(J1 EOR S); 3496 // I2 = NOT(J2 EOR S); 3497 // and build the imm32 with one trailing zero as documented: 3498 // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32); 3499 unsigned S = (Val >> 23) & 1; 3500 unsigned J1 = (Val >> 22) & 1; 3501 unsigned J2 = (Val >> 21) & 1; 3502 unsigned I1 = !(J1 ^ S); 3503 unsigned I2 = !(J2 ^ S); 3504 unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21); 3505 int imm32 = SignExtend32<25>(tmp << 1); 3506 3507 if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4, 3508 true, 4, Inst, Decoder)) 3509 Inst.addOperand(MCOperand::CreateImm(imm32)); 3510 return MCDisassembler::Success; 3511} 3512 3513static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Val, 3514 uint64_t Address, const void *Decoder) { 3515 if (Val & ~0xf) 3516 return MCDisassembler::Fail; 3517 3518 Inst.addOperand(MCOperand::CreateImm(Val)); 3519 return MCDisassembler::Success; 3520} 3521 3522static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Val, 3523 uint64_t Address, const void *Decoder) { 3524 if (!Val) return MCDisassembler::Fail; 3525 Inst.addOperand(MCOperand::CreateImm(Val)); 3526 return MCDisassembler::Success; 3527} 3528 3529static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn, 3530 uint64_t Address, const void *Decoder) { 3531 DecodeStatus S = MCDisassembler::Success; 3532 3533 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3534 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3535 unsigned pred = fieldFromInstruction(Insn, 28, 4); 3536 3537 if ((Rt & 1) || Rt == 0xE || Rn == 0xF) return MCDisassembler::Fail; 3538 3539 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3540 return MCDisassembler::Fail; 3541 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 3542 return MCDisassembler::Fail; 3543 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3544 return MCDisassembler::Fail; 3545 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3546 return MCDisassembler::Fail; 3547 3548 return S; 3549} 3550 3551 3552static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn, 3553 uint64_t Address, const void *Decoder){ 3554 DecodeStatus S = MCDisassembler::Success; 3555 3556 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3557 unsigned Rt = fieldFromInstruction(Insn, 0, 4); 3558 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3559 unsigned pred = fieldFromInstruction(Insn, 28, 4); 3560 3561 if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) 3562 return MCDisassembler::Fail; 3563 3564 if ((Rt & 1) || Rt == 0xE || Rn == 0xF) return MCDisassembler::Fail; 3565 if (Rd == Rn || Rd == Rt || Rd == Rt+1) return MCDisassembler::Fail; 3566 3567 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3568 return MCDisassembler::Fail; 3569 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) 3570 return MCDisassembler::Fail; 3571 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3572 return MCDisassembler::Fail; 3573 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3574 return MCDisassembler::Fail; 3575 3576 return S; 3577} 3578 3579static DecodeStatus DecodeLDRPreImm(MCInst &Inst, unsigned Insn, 3580 uint64_t Address, const void *Decoder) { 3581 DecodeStatus S = MCDisassembler::Success; 3582 3583 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3584 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3585 unsigned imm = fieldFromInstruction(Insn, 0, 12); 3586 imm |= fieldFromInstruction(Insn, 16, 4) << 13; 3587 imm |= fieldFromInstruction(Insn, 23, 1) << 12; 3588 unsigned pred = fieldFromInstruction(Insn, 28, 4); 3589 3590 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3591 3592 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3593 return MCDisassembler::Fail; 3594 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3595 return MCDisassembler::Fail; 3596 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) 3597 return MCDisassembler::Fail; 3598 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3599 return MCDisassembler::Fail; 3600 3601 return S; 3602} 3603 3604static DecodeStatus DecodeLDRPreReg(MCInst &Inst, unsigned Insn, 3605 uint64_t Address, const void *Decoder) { 3606 DecodeStatus S = MCDisassembler::Success; 3607 3608 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3609 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3610 unsigned imm = fieldFromInstruction(Insn, 0, 12); 3611 imm |= fieldFromInstruction(Insn, 16, 4) << 13; 3612 imm |= fieldFromInstruction(Insn, 23, 1) << 12; 3613 unsigned pred = fieldFromInstruction(Insn, 28, 4); 3614 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3615 3616 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3617 if (Rm == 0xF) S = MCDisassembler::SoftFail; 3618 3619 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3620 return MCDisassembler::Fail; 3621 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3622 return MCDisassembler::Fail; 3623 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) 3624 return MCDisassembler::Fail; 3625 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3626 return MCDisassembler::Fail; 3627 3628 return S; 3629} 3630 3631 3632static DecodeStatus DecodeSTRPreImm(MCInst &Inst, unsigned Insn, 3633 uint64_t Address, const void *Decoder) { 3634 DecodeStatus S = MCDisassembler::Success; 3635 3636 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3637 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3638 unsigned imm = fieldFromInstruction(Insn, 0, 12); 3639 imm |= fieldFromInstruction(Insn, 16, 4) << 13; 3640 imm |= fieldFromInstruction(Insn, 23, 1) << 12; 3641 unsigned pred = fieldFromInstruction(Insn, 28, 4); 3642 3643 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3644 3645 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3646 return MCDisassembler::Fail; 3647 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3648 return MCDisassembler::Fail; 3649 if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) 3650 return MCDisassembler::Fail; 3651 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3652 return MCDisassembler::Fail; 3653 3654 return S; 3655} 3656 3657static DecodeStatus DecodeSTRPreReg(MCInst &Inst, unsigned Insn, 3658 uint64_t Address, const void *Decoder) { 3659 DecodeStatus S = MCDisassembler::Success; 3660 3661 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3662 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 3663 unsigned imm = fieldFromInstruction(Insn, 0, 12); 3664 imm |= fieldFromInstruction(Insn, 16, 4) << 13; 3665 imm |= fieldFromInstruction(Insn, 23, 1) << 12; 3666 unsigned pred = fieldFromInstruction(Insn, 28, 4); 3667 3668 if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; 3669 3670 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3671 return MCDisassembler::Fail; 3672 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) 3673 return MCDisassembler::Fail; 3674 if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) 3675 return MCDisassembler::Fail; 3676 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 3677 return MCDisassembler::Fail; 3678 3679 return S; 3680} 3681 3682static DecodeStatus DecodeVLD1LN(MCInst &Inst, unsigned Insn, 3683 uint64_t Address, const void *Decoder) { 3684 DecodeStatus S = MCDisassembler::Success; 3685 3686 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3687 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3688 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3689 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3690 unsigned size = fieldFromInstruction(Insn, 10, 2); 3691 3692 unsigned align = 0; 3693 unsigned index = 0; 3694 switch (size) { 3695 default: 3696 return MCDisassembler::Fail; 3697 case 0: 3698 if (fieldFromInstruction(Insn, 4, 1)) 3699 return MCDisassembler::Fail; // UNDEFINED 3700 index = fieldFromInstruction(Insn, 5, 3); 3701 break; 3702 case 1: 3703 if (fieldFromInstruction(Insn, 5, 1)) 3704 return MCDisassembler::Fail; // UNDEFINED 3705 index = fieldFromInstruction(Insn, 6, 2); 3706 if (fieldFromInstruction(Insn, 4, 1)) 3707 align = 2; 3708 break; 3709 case 2: 3710 if (fieldFromInstruction(Insn, 6, 1)) 3711 return MCDisassembler::Fail; // UNDEFINED 3712 index = fieldFromInstruction(Insn, 7, 1); 3713 if (fieldFromInstruction(Insn, 4, 2) != 0) 3714 align = 4; 3715 } 3716 3717 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3718 return MCDisassembler::Fail; 3719 if (Rm != 0xF) { // Writeback 3720 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3721 return MCDisassembler::Fail; 3722 } 3723 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3724 return MCDisassembler::Fail; 3725 Inst.addOperand(MCOperand::CreateImm(align)); 3726 if (Rm != 0xF) { 3727 if (Rm != 0xD) { 3728 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3729 return MCDisassembler::Fail; 3730 } else 3731 Inst.addOperand(MCOperand::CreateReg(0)); 3732 } 3733 3734 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3735 return MCDisassembler::Fail; 3736 Inst.addOperand(MCOperand::CreateImm(index)); 3737 3738 return S; 3739} 3740 3741static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn, 3742 uint64_t Address, const void *Decoder) { 3743 DecodeStatus S = MCDisassembler::Success; 3744 3745 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3746 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3747 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3748 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3749 unsigned size = fieldFromInstruction(Insn, 10, 2); 3750 3751 unsigned align = 0; 3752 unsigned index = 0; 3753 switch (size) { 3754 default: 3755 return MCDisassembler::Fail; 3756 case 0: 3757 if (fieldFromInstruction(Insn, 4, 1)) 3758 return MCDisassembler::Fail; // UNDEFINED 3759 index = fieldFromInstruction(Insn, 5, 3); 3760 break; 3761 case 1: 3762 if (fieldFromInstruction(Insn, 5, 1)) 3763 return MCDisassembler::Fail; // UNDEFINED 3764 index = fieldFromInstruction(Insn, 6, 2); 3765 if (fieldFromInstruction(Insn, 4, 1)) 3766 align = 2; 3767 break; 3768 case 2: 3769 if (fieldFromInstruction(Insn, 6, 1)) 3770 return MCDisassembler::Fail; // UNDEFINED 3771 index = fieldFromInstruction(Insn, 7, 1); 3772 if (fieldFromInstruction(Insn, 4, 2) != 0) 3773 align = 4; 3774 } 3775 3776 if (Rm != 0xF) { // Writeback 3777 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3778 return MCDisassembler::Fail; 3779 } 3780 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3781 return MCDisassembler::Fail; 3782 Inst.addOperand(MCOperand::CreateImm(align)); 3783 if (Rm != 0xF) { 3784 if (Rm != 0xD) { 3785 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3786 return MCDisassembler::Fail; 3787 } else 3788 Inst.addOperand(MCOperand::CreateReg(0)); 3789 } 3790 3791 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3792 return MCDisassembler::Fail; 3793 Inst.addOperand(MCOperand::CreateImm(index)); 3794 3795 return S; 3796} 3797 3798 3799static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn, 3800 uint64_t Address, const void *Decoder) { 3801 DecodeStatus S = MCDisassembler::Success; 3802 3803 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3804 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3805 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3806 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3807 unsigned size = fieldFromInstruction(Insn, 10, 2); 3808 3809 unsigned align = 0; 3810 unsigned index = 0; 3811 unsigned inc = 1; 3812 switch (size) { 3813 default: 3814 return MCDisassembler::Fail; 3815 case 0: 3816 index = fieldFromInstruction(Insn, 5, 3); 3817 if (fieldFromInstruction(Insn, 4, 1)) 3818 align = 2; 3819 break; 3820 case 1: 3821 index = fieldFromInstruction(Insn, 6, 2); 3822 if (fieldFromInstruction(Insn, 4, 1)) 3823 align = 4; 3824 if (fieldFromInstruction(Insn, 5, 1)) 3825 inc = 2; 3826 break; 3827 case 2: 3828 if (fieldFromInstruction(Insn, 5, 1)) 3829 return MCDisassembler::Fail; // UNDEFINED 3830 index = fieldFromInstruction(Insn, 7, 1); 3831 if (fieldFromInstruction(Insn, 4, 1) != 0) 3832 align = 8; 3833 if (fieldFromInstruction(Insn, 6, 1)) 3834 inc = 2; 3835 break; 3836 } 3837 3838 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3839 return MCDisassembler::Fail; 3840 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3841 return MCDisassembler::Fail; 3842 if (Rm != 0xF) { // Writeback 3843 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3844 return MCDisassembler::Fail; 3845 } 3846 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3847 return MCDisassembler::Fail; 3848 Inst.addOperand(MCOperand::CreateImm(align)); 3849 if (Rm != 0xF) { 3850 if (Rm != 0xD) { 3851 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3852 return MCDisassembler::Fail; 3853 } else 3854 Inst.addOperand(MCOperand::CreateReg(0)); 3855 } 3856 3857 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3858 return MCDisassembler::Fail; 3859 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3860 return MCDisassembler::Fail; 3861 Inst.addOperand(MCOperand::CreateImm(index)); 3862 3863 return S; 3864} 3865 3866static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn, 3867 uint64_t Address, const void *Decoder) { 3868 DecodeStatus S = MCDisassembler::Success; 3869 3870 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3871 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3872 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3873 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3874 unsigned size = fieldFromInstruction(Insn, 10, 2); 3875 3876 unsigned align = 0; 3877 unsigned index = 0; 3878 unsigned inc = 1; 3879 switch (size) { 3880 default: 3881 return MCDisassembler::Fail; 3882 case 0: 3883 index = fieldFromInstruction(Insn, 5, 3); 3884 if (fieldFromInstruction(Insn, 4, 1)) 3885 align = 2; 3886 break; 3887 case 1: 3888 index = fieldFromInstruction(Insn, 6, 2); 3889 if (fieldFromInstruction(Insn, 4, 1)) 3890 align = 4; 3891 if (fieldFromInstruction(Insn, 5, 1)) 3892 inc = 2; 3893 break; 3894 case 2: 3895 if (fieldFromInstruction(Insn, 5, 1)) 3896 return MCDisassembler::Fail; // UNDEFINED 3897 index = fieldFromInstruction(Insn, 7, 1); 3898 if (fieldFromInstruction(Insn, 4, 1) != 0) 3899 align = 8; 3900 if (fieldFromInstruction(Insn, 6, 1)) 3901 inc = 2; 3902 break; 3903 } 3904 3905 if (Rm != 0xF) { // Writeback 3906 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3907 return MCDisassembler::Fail; 3908 } 3909 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3910 return MCDisassembler::Fail; 3911 Inst.addOperand(MCOperand::CreateImm(align)); 3912 if (Rm != 0xF) { 3913 if (Rm != 0xD) { 3914 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3915 return MCDisassembler::Fail; 3916 } else 3917 Inst.addOperand(MCOperand::CreateReg(0)); 3918 } 3919 3920 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3921 return MCDisassembler::Fail; 3922 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3923 return MCDisassembler::Fail; 3924 Inst.addOperand(MCOperand::CreateImm(index)); 3925 3926 return S; 3927} 3928 3929 3930static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn, 3931 uint64_t Address, const void *Decoder) { 3932 DecodeStatus S = MCDisassembler::Success; 3933 3934 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 3935 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 3936 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 3937 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 3938 unsigned size = fieldFromInstruction(Insn, 10, 2); 3939 3940 unsigned align = 0; 3941 unsigned index = 0; 3942 unsigned inc = 1; 3943 switch (size) { 3944 default: 3945 return MCDisassembler::Fail; 3946 case 0: 3947 if (fieldFromInstruction(Insn, 4, 1)) 3948 return MCDisassembler::Fail; // UNDEFINED 3949 index = fieldFromInstruction(Insn, 5, 3); 3950 break; 3951 case 1: 3952 if (fieldFromInstruction(Insn, 4, 1)) 3953 return MCDisassembler::Fail; // UNDEFINED 3954 index = fieldFromInstruction(Insn, 6, 2); 3955 if (fieldFromInstruction(Insn, 5, 1)) 3956 inc = 2; 3957 break; 3958 case 2: 3959 if (fieldFromInstruction(Insn, 4, 2)) 3960 return MCDisassembler::Fail; // UNDEFINED 3961 index = fieldFromInstruction(Insn, 7, 1); 3962 if (fieldFromInstruction(Insn, 6, 1)) 3963 inc = 2; 3964 break; 3965 } 3966 3967 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3968 return MCDisassembler::Fail; 3969 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3970 return MCDisassembler::Fail; 3971 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3972 return MCDisassembler::Fail; 3973 3974 if (Rm != 0xF) { // Writeback 3975 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3976 return MCDisassembler::Fail; 3977 } 3978 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 3979 return MCDisassembler::Fail; 3980 Inst.addOperand(MCOperand::CreateImm(align)); 3981 if (Rm != 0xF) { 3982 if (Rm != 0xD) { 3983 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 3984 return MCDisassembler::Fail; 3985 } else 3986 Inst.addOperand(MCOperand::CreateReg(0)); 3987 } 3988 3989 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 3990 return MCDisassembler::Fail; 3991 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 3992 return MCDisassembler::Fail; 3993 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 3994 return MCDisassembler::Fail; 3995 Inst.addOperand(MCOperand::CreateImm(index)); 3996 3997 return S; 3998} 3999 4000static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn, 4001 uint64_t Address, const void *Decoder) { 4002 DecodeStatus S = MCDisassembler::Success; 4003 4004 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4005 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4006 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4007 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4008 unsigned size = fieldFromInstruction(Insn, 10, 2); 4009 4010 unsigned align = 0; 4011 unsigned index = 0; 4012 unsigned inc = 1; 4013 switch (size) { 4014 default: 4015 return MCDisassembler::Fail; 4016 case 0: 4017 if (fieldFromInstruction(Insn, 4, 1)) 4018 return MCDisassembler::Fail; // UNDEFINED 4019 index = fieldFromInstruction(Insn, 5, 3); 4020 break; 4021 case 1: 4022 if (fieldFromInstruction(Insn, 4, 1)) 4023 return MCDisassembler::Fail; // UNDEFINED 4024 index = fieldFromInstruction(Insn, 6, 2); 4025 if (fieldFromInstruction(Insn, 5, 1)) 4026 inc = 2; 4027 break; 4028 case 2: 4029 if (fieldFromInstruction(Insn, 4, 2)) 4030 return MCDisassembler::Fail; // UNDEFINED 4031 index = fieldFromInstruction(Insn, 7, 1); 4032 if (fieldFromInstruction(Insn, 6, 1)) 4033 inc = 2; 4034 break; 4035 } 4036 4037 if (Rm != 0xF) { // Writeback 4038 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4039 return MCDisassembler::Fail; 4040 } 4041 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4042 return MCDisassembler::Fail; 4043 Inst.addOperand(MCOperand::CreateImm(align)); 4044 if (Rm != 0xF) { 4045 if (Rm != 0xD) { 4046 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4047 return MCDisassembler::Fail; 4048 } else 4049 Inst.addOperand(MCOperand::CreateReg(0)); 4050 } 4051 4052 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4053 return MCDisassembler::Fail; 4054 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4055 return MCDisassembler::Fail; 4056 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4057 return MCDisassembler::Fail; 4058 Inst.addOperand(MCOperand::CreateImm(index)); 4059 4060 return S; 4061} 4062 4063 4064static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn, 4065 uint64_t Address, const void *Decoder) { 4066 DecodeStatus S = MCDisassembler::Success; 4067 4068 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4069 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4070 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4071 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4072 unsigned size = fieldFromInstruction(Insn, 10, 2); 4073 4074 unsigned align = 0; 4075 unsigned index = 0; 4076 unsigned inc = 1; 4077 switch (size) { 4078 default: 4079 return MCDisassembler::Fail; 4080 case 0: 4081 if (fieldFromInstruction(Insn, 4, 1)) 4082 align = 4; 4083 index = fieldFromInstruction(Insn, 5, 3); 4084 break; 4085 case 1: 4086 if (fieldFromInstruction(Insn, 4, 1)) 4087 align = 8; 4088 index = fieldFromInstruction(Insn, 6, 2); 4089 if (fieldFromInstruction(Insn, 5, 1)) 4090 inc = 2; 4091 break; 4092 case 2: 4093 if (fieldFromInstruction(Insn, 4, 2)) 4094 align = 4 << fieldFromInstruction(Insn, 4, 2); 4095 index = fieldFromInstruction(Insn, 7, 1); 4096 if (fieldFromInstruction(Insn, 6, 1)) 4097 inc = 2; 4098 break; 4099 } 4100 4101 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4102 return MCDisassembler::Fail; 4103 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4104 return MCDisassembler::Fail; 4105 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4106 return MCDisassembler::Fail; 4107 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 4108 return MCDisassembler::Fail; 4109 4110 if (Rm != 0xF) { // Writeback 4111 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4112 return MCDisassembler::Fail; 4113 } 4114 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4115 return MCDisassembler::Fail; 4116 Inst.addOperand(MCOperand::CreateImm(align)); 4117 if (Rm != 0xF) { 4118 if (Rm != 0xD) { 4119 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4120 return MCDisassembler::Fail; 4121 } else 4122 Inst.addOperand(MCOperand::CreateReg(0)); 4123 } 4124 4125 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4126 return MCDisassembler::Fail; 4127 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4128 return MCDisassembler::Fail; 4129 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4130 return MCDisassembler::Fail; 4131 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 4132 return MCDisassembler::Fail; 4133 Inst.addOperand(MCOperand::CreateImm(index)); 4134 4135 return S; 4136} 4137 4138static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn, 4139 uint64_t Address, const void *Decoder) { 4140 DecodeStatus S = MCDisassembler::Success; 4141 4142 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4143 unsigned Rm = fieldFromInstruction(Insn, 0, 4); 4144 unsigned Rd = fieldFromInstruction(Insn, 12, 4); 4145 Rd |= fieldFromInstruction(Insn, 22, 1) << 4; 4146 unsigned size = fieldFromInstruction(Insn, 10, 2); 4147 4148 unsigned align = 0; 4149 unsigned index = 0; 4150 unsigned inc = 1; 4151 switch (size) { 4152 default: 4153 return MCDisassembler::Fail; 4154 case 0: 4155 if (fieldFromInstruction(Insn, 4, 1)) 4156 align = 4; 4157 index = fieldFromInstruction(Insn, 5, 3); 4158 break; 4159 case 1: 4160 if (fieldFromInstruction(Insn, 4, 1)) 4161 align = 8; 4162 index = fieldFromInstruction(Insn, 6, 2); 4163 if (fieldFromInstruction(Insn, 5, 1)) 4164 inc = 2; 4165 break; 4166 case 2: 4167 if (fieldFromInstruction(Insn, 4, 2)) 4168 align = 4 << fieldFromInstruction(Insn, 4, 2); 4169 index = fieldFromInstruction(Insn, 7, 1); 4170 if (fieldFromInstruction(Insn, 6, 1)) 4171 inc = 2; 4172 break; 4173 } 4174 4175 if (Rm != 0xF) { // Writeback 4176 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4177 return MCDisassembler::Fail; 4178 } 4179 if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) 4180 return MCDisassembler::Fail; 4181 Inst.addOperand(MCOperand::CreateImm(align)); 4182 if (Rm != 0xF) { 4183 if (Rm != 0xD) { 4184 if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) 4185 return MCDisassembler::Fail; 4186 } else 4187 Inst.addOperand(MCOperand::CreateReg(0)); 4188 } 4189 4190 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) 4191 return MCDisassembler::Fail; 4192 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) 4193 return MCDisassembler::Fail; 4194 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) 4195 return MCDisassembler::Fail; 4196 if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) 4197 return MCDisassembler::Fail; 4198 Inst.addOperand(MCOperand::CreateImm(index)); 4199 4200 return S; 4201} 4202 4203static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn, 4204 uint64_t Address, const void *Decoder) { 4205 DecodeStatus S = MCDisassembler::Success; 4206 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4207 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4); 4208 unsigned Rm = fieldFromInstruction(Insn, 5, 1); 4209 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4210 Rm |= fieldFromInstruction(Insn, 0, 4) << 1; 4211 4212 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) 4213 S = MCDisassembler::SoftFail; 4214 4215 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) 4216 return MCDisassembler::Fail; 4217 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) 4218 return MCDisassembler::Fail; 4219 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) 4220 return MCDisassembler::Fail; 4221 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) 4222 return MCDisassembler::Fail; 4223 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4224 return MCDisassembler::Fail; 4225 4226 return S; 4227} 4228 4229static DecodeStatus DecodeVMOVRRS(MCInst &Inst, unsigned Insn, 4230 uint64_t Address, const void *Decoder) { 4231 DecodeStatus S = MCDisassembler::Success; 4232 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4233 unsigned Rt2 = fieldFromInstruction(Insn, 16, 4); 4234 unsigned Rm = fieldFromInstruction(Insn, 5, 1); 4235 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4236 Rm |= fieldFromInstruction(Insn, 0, 4) << 1; 4237 4238 if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) 4239 S = MCDisassembler::SoftFail; 4240 4241 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) 4242 return MCDisassembler::Fail; 4243 if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) 4244 return MCDisassembler::Fail; 4245 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) 4246 return MCDisassembler::Fail; 4247 if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) 4248 return MCDisassembler::Fail; 4249 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4250 return MCDisassembler::Fail; 4251 4252 return S; 4253} 4254 4255static DecodeStatus DecodeIT(MCInst &Inst, unsigned Insn, 4256 uint64_t Address, const void *Decoder) { 4257 DecodeStatus S = MCDisassembler::Success; 4258 unsigned pred = fieldFromInstruction(Insn, 4, 4); 4259 unsigned mask = fieldFromInstruction(Insn, 0, 4); 4260 4261 if (pred == 0xF) { 4262 pred = 0xE; 4263 S = MCDisassembler::SoftFail; 4264 } 4265 4266 if (mask == 0x0) { 4267 mask |= 0x8; 4268 S = MCDisassembler::SoftFail; 4269 } 4270 4271 Inst.addOperand(MCOperand::CreateImm(pred)); 4272 Inst.addOperand(MCOperand::CreateImm(mask)); 4273 return S; 4274} 4275 4276static DecodeStatus 4277DecodeT2LDRDPreInstruction(MCInst &Inst, unsigned Insn, 4278 uint64_t Address, const void *Decoder) { 4279 DecodeStatus S = MCDisassembler::Success; 4280 4281 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4282 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4); 4283 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4284 unsigned addr = fieldFromInstruction(Insn, 0, 8); 4285 unsigned W = fieldFromInstruction(Insn, 21, 1); 4286 unsigned U = fieldFromInstruction(Insn, 23, 1); 4287 unsigned P = fieldFromInstruction(Insn, 24, 1); 4288 bool writeback = (W == 1) | (P == 0); 4289 4290 addr |= (U << 8) | (Rn << 9); 4291 4292 if (writeback && (Rn == Rt || Rn == Rt2)) 4293 Check(S, MCDisassembler::SoftFail); 4294 if (Rt == Rt2) 4295 Check(S, MCDisassembler::SoftFail); 4296 4297 // Rt 4298 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 4299 return MCDisassembler::Fail; 4300 // Rt2 4301 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) 4302 return MCDisassembler::Fail; 4303 // Writeback operand 4304 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) 4305 return MCDisassembler::Fail; 4306 // addr 4307 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) 4308 return MCDisassembler::Fail; 4309 4310 return S; 4311} 4312 4313static DecodeStatus 4314DecodeT2STRDPreInstruction(MCInst &Inst, unsigned Insn, 4315 uint64_t Address, const void *Decoder) { 4316 DecodeStatus S = MCDisassembler::Success; 4317 4318 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4319 unsigned Rt2 = fieldFromInstruction(Insn, 8, 4); 4320 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4321 unsigned addr = fieldFromInstruction(Insn, 0, 8); 4322 unsigned W = fieldFromInstruction(Insn, 21, 1); 4323 unsigned U = fieldFromInstruction(Insn, 23, 1); 4324 unsigned P = fieldFromInstruction(Insn, 24, 1); 4325 bool writeback = (W == 1) | (P == 0); 4326 4327 addr |= (U << 8) | (Rn << 9); 4328 4329 if (writeback && (Rn == Rt || Rn == Rt2)) 4330 Check(S, MCDisassembler::SoftFail); 4331 4332 // Writeback operand 4333 if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) 4334 return MCDisassembler::Fail; 4335 // Rt 4336 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) 4337 return MCDisassembler::Fail; 4338 // Rt2 4339 if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) 4340 return MCDisassembler::Fail; 4341 // addr 4342 if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) 4343 return MCDisassembler::Fail; 4344 4345 return S; 4346} 4347 4348static DecodeStatus DecodeT2Adr(MCInst &Inst, uint32_t Insn, 4349 uint64_t Address, const void *Decoder) { 4350 unsigned sign1 = fieldFromInstruction(Insn, 21, 1); 4351 unsigned sign2 = fieldFromInstruction(Insn, 23, 1); 4352 if (sign1 != sign2) return MCDisassembler::Fail; 4353 4354 unsigned Val = fieldFromInstruction(Insn, 0, 8); 4355 Val |= fieldFromInstruction(Insn, 12, 3) << 8; 4356 Val |= fieldFromInstruction(Insn, 26, 1) << 11; 4357 Val |= sign1 << 12; 4358 Inst.addOperand(MCOperand::CreateImm(SignExtend32<13>(Val))); 4359 4360 return MCDisassembler::Success; 4361} 4362 4363static DecodeStatus DecodeT2ShifterImmOperand(MCInst &Inst, uint32_t Val, 4364 uint64_t Address, 4365 const void *Decoder) { 4366 DecodeStatus S = MCDisassembler::Success; 4367 4368 // Shift of "asr #32" is not allowed in Thumb2 mode. 4369 if (Val == 0x20) S = MCDisassembler::SoftFail; 4370 Inst.addOperand(MCOperand::CreateImm(Val)); 4371 return S; 4372} 4373 4374static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn, 4375 uint64_t Address, const void *Decoder) { 4376 unsigned Rt = fieldFromInstruction(Insn, 12, 4); 4377 unsigned Rt2 = fieldFromInstruction(Insn, 0, 4); 4378 unsigned Rn = fieldFromInstruction(Insn, 16, 4); 4379 unsigned pred = fieldFromInstruction(Insn, 28, 4); 4380 4381 if (pred == 0xF) 4382 return DecodeCPSInstruction(Inst, Insn, Address, Decoder); 4383 4384 DecodeStatus S = MCDisassembler::Success; 4385 4386 if (Rt == Rn || Rn == Rt2) 4387 S = MCDisassembler::SoftFail; 4388 4389 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) 4390 return MCDisassembler::Fail; 4391 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder))) 4392 return MCDisassembler::Fail; 4393 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 4394 return MCDisassembler::Fail; 4395 if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) 4396 return MCDisassembler::Fail; 4397 4398 return S; 4399} 4400 4401static DecodeStatus DecodeVCVTD(MCInst &Inst, unsigned Insn, 4402 uint64_t Address, const void *Decoder) { 4403 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0); 4404 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4); 4405 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0); 4406 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4); 4407 unsigned imm = fieldFromInstruction(Insn, 16, 6); 4408 unsigned cmode = fieldFromInstruction(Insn, 8, 4); 4409 4410 DecodeStatus S = MCDisassembler::Success; 4411 4412 // VMOVv2f32 is ambiguous with these decodings. 4413 if (!(imm & 0x38) && cmode == 0xF) { 4414 Inst.setOpcode(ARM::VMOVv2f32); 4415 return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder); 4416 } 4417 4418 if (!(imm & 0x20)) Check(S, MCDisassembler::SoftFail); 4419 4420 if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder))) 4421 return MCDisassembler::Fail; 4422 if (!Check(S, DecodeDPRRegisterClass(Inst, Vm, Address, Decoder))) 4423 return MCDisassembler::Fail; 4424 Inst.addOperand(MCOperand::CreateImm(64 - imm)); 4425 4426 return S; 4427} 4428 4429static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn, 4430 uint64_t Address, const void *Decoder) { 4431 unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0); 4432 Vd |= (fieldFromInstruction(Insn, 22, 1) << 4); 4433 unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0); 4434 Vm |= (fieldFromInstruction(Insn, 5, 1) << 4); 4435 unsigned imm = fieldFromInstruction(Insn, 16, 6); 4436 unsigned cmode = fieldFromInstruction(Insn, 8, 4); 4437 4438 DecodeStatus S = MCDisassembler::Success; 4439 4440 // VMOVv4f32 is ambiguous with these decodings. 4441 if (!(imm & 0x38) && cmode == 0xF) { 4442 Inst.setOpcode(ARM::VMOVv4f32); 4443 return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder); 4444 } 4445 4446 if (!(imm & 0x20)) Check(S, MCDisassembler::SoftFail); 4447 4448 if (!Check(S, DecodeQPRRegisterClass(Inst, Vd, Address, Decoder))) 4449 return MCDisassembler::Fail; 4450 if (!Check(S, DecodeQPRRegisterClass(Inst, Vm, Address, Decoder))) 4451 return MCDisassembler::Fail; 4452 Inst.addOperand(MCOperand::CreateImm(64 - imm)); 4453 4454 return S; 4455} 4456 4457static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val, 4458 uint64_t Address, const void *Decoder) { 4459 DecodeStatus S = MCDisassembler::Success; 4460 4461 unsigned Rn = fieldFromInstruction(Val, 16, 4); 4462 unsigned Rt = fieldFromInstruction(Val, 12, 4); 4463 unsigned Rm = fieldFromInstruction(Val, 0, 4); 4464 Rm |= (fieldFromInstruction(Val, 23, 1) << 4); 4465 unsigned Cond = fieldFromInstruction(Val, 28, 4); 4466 4467 if (fieldFromInstruction(Val, 8, 4) != 0 || Rn == Rt) 4468 S = MCDisassembler::SoftFail; 4469 4470 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) 4471 return MCDisassembler::Fail; 4472 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) 4473 return MCDisassembler::Fail; 4474 if (!Check(S, DecodeAddrMode7Operand(Inst, Rn, Address, Decoder))) 4475 return MCDisassembler::Fail; 4476 if (!Check(S, DecodePostIdxReg(Inst, Rm, Address, Decoder))) 4477 return MCDisassembler::Fail; 4478 if (!Check(S, DecodePredicateOperand(Inst, Cond, Address, Decoder))) 4479 return MCDisassembler::Fail; 4480 4481 return S; 4482} 4483 4484static DecodeStatus DecodeMRRC2(llvm::MCInst &Inst, unsigned Val, 4485 uint64_t Address, const void *Decoder) { 4486 4487 DecodeStatus S = MCDisassembler::Success; 4488 4489 unsigned CRm = fieldFromInstruction(Val, 0, 4); 4490 unsigned opc1 = fieldFromInstruction(Val, 4, 4); 4491 unsigned cop = fieldFromInstruction(Val, 8, 4); 4492 unsigned Rt = fieldFromInstruction(Val, 12, 4); 4493 unsigned Rt2 = fieldFromInstruction(Val, 16, 4); 4494 4495 if ((cop & ~0x1) == 0xa) 4496 return MCDisassembler::Fail; 4497 4498 if (Rt == Rt2) 4499 S = MCDisassembler::SoftFail; 4500 4501 Inst.addOperand(MCOperand::CreateImm(cop)); 4502 Inst.addOperand(MCOperand::CreateImm(opc1)); 4503 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) 4504 return MCDisassembler::Fail; 4505 if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder))) 4506 return MCDisassembler::Fail; 4507 Inst.addOperand(MCOperand::CreateImm(CRm)); 4508 4509 return S; 4510} 4511 4512