1 //===- MipsDisassembler.cpp - Disassembler for Mips -------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file is part of the Mips Disassembler. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "Mips.h" 15 #include "MipsRegisterInfo.h" 16 #include "MipsSubtarget.h" 17 #include "llvm/MC/MCContext.h" 18 #include "llvm/MC/MCDisassembler.h" 19 #include "llvm/MC/MCFixedLenDisassembler.h" 20 #include "llvm/MC/MCInst.h" 21 #include "llvm/MC/MCSubtargetInfo.h" 22 #include "llvm/Support/MathExtras.h" 23 #include "llvm/Support/TargetRegistry.h" 24 25 using namespace llvm; 26 27 #define DEBUG_TYPE "mips-disassembler" 28 29 typedef MCDisassembler::DecodeStatus DecodeStatus; 30 31 namespace { 32 33 class MipsDisassembler : public MCDisassembler { 34 bool IsMicroMips; 35 bool IsBigEndian; 36 public: 37 MipsDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx, bool IsBigEndian) 38 : MCDisassembler(STI, Ctx), 39 IsMicroMips(STI.getFeatureBits()[Mips::FeatureMicroMips]), 40 IsBigEndian(IsBigEndian) {} 41 42 bool hasMips3() const { return STI.getFeatureBits()[Mips::FeatureMips3]; } 43 bool hasMips32() const { return STI.getFeatureBits()[Mips::FeatureMips32]; } 44 bool hasMips32r6() const { 45 return STI.getFeatureBits()[Mips::FeatureMips32r6]; 46 } 47 48 bool isGP64() const { return STI.getFeatureBits()[Mips::FeatureGP64Bit]; } 49 50 bool hasCnMips() const { return STI.getFeatureBits()[Mips::FeatureCnMips]; } 51 52 bool hasCOP3() const { 53 // Only present in MIPS-I and MIPS-II 54 return !hasMips32() && !hasMips3(); 55 } 56 57 DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size, 58 ArrayRef<uint8_t> Bytes, uint64_t Address, 59 raw_ostream &VStream, 60 raw_ostream &CStream) const override; 61 }; 62 63 } // end anonymous namespace 64 65 // Forward declare these because the autogenerated code will reference them. 66 // Definitions are further down. 67 static DecodeStatus DecodeGPR64RegisterClass(MCInst &Inst, 68 unsigned RegNo, 69 uint64_t Address, 70 const void *Decoder); 71 72 static DecodeStatus DecodeCPU16RegsRegisterClass(MCInst &Inst, 73 unsigned RegNo, 74 uint64_t Address, 75 const void *Decoder); 76 77 static DecodeStatus DecodeGPRMM16RegisterClass(MCInst &Inst, 78 unsigned RegNo, 79 uint64_t Address, 80 const void *Decoder); 81 82 static DecodeStatus DecodeGPRMM16ZeroRegisterClass(MCInst &Inst, 83 unsigned RegNo, 84 uint64_t Address, 85 const void *Decoder); 86 87 static DecodeStatus DecodeGPRMM16MovePRegisterClass(MCInst &Inst, 88 unsigned RegNo, 89 uint64_t Address, 90 const void *Decoder); 91 92 static DecodeStatus DecodeGPR32RegisterClass(MCInst &Inst, 93 unsigned RegNo, 94 uint64_t Address, 95 const void *Decoder); 96 97 static DecodeStatus DecodePtrRegisterClass(MCInst &Inst, 98 unsigned Insn, 99 uint64_t Address, 100 const void *Decoder); 101 102 static DecodeStatus DecodeDSPRRegisterClass(MCInst &Inst, 103 unsigned RegNo, 104 uint64_t Address, 105 const void *Decoder); 106 107 static DecodeStatus DecodeFGR64RegisterClass(MCInst &Inst, 108 unsigned RegNo, 109 uint64_t Address, 110 const void *Decoder); 111 112 static DecodeStatus DecodeFGR32RegisterClass(MCInst &Inst, 113 unsigned RegNo, 114 uint64_t Address, 115 const void *Decoder); 116 117 static DecodeStatus DecodeCCRRegisterClass(MCInst &Inst, 118 unsigned RegNo, 119 uint64_t Address, 120 const void *Decoder); 121 122 static DecodeStatus DecodeFCCRegisterClass(MCInst &Inst, 123 unsigned RegNo, 124 uint64_t Address, 125 const void *Decoder); 126 127 static DecodeStatus DecodeFGRCCRegisterClass(MCInst &Inst, unsigned RegNo, 128 uint64_t Address, 129 const void *Decoder); 130 131 static DecodeStatus DecodeHWRegsRegisterClass(MCInst &Inst, 132 unsigned Insn, 133 uint64_t Address, 134 const void *Decoder); 135 136 static DecodeStatus DecodeAFGR64RegisterClass(MCInst &Inst, 137 unsigned RegNo, 138 uint64_t Address, 139 const void *Decoder); 140 141 static DecodeStatus DecodeACC64DSPRegisterClass(MCInst &Inst, 142 unsigned RegNo, 143 uint64_t Address, 144 const void *Decoder); 145 146 static DecodeStatus DecodeHI32DSPRegisterClass(MCInst &Inst, 147 unsigned RegNo, 148 uint64_t Address, 149 const void *Decoder); 150 151 static DecodeStatus DecodeLO32DSPRegisterClass(MCInst &Inst, 152 unsigned RegNo, 153 uint64_t Address, 154 const void *Decoder); 155 156 static DecodeStatus DecodeMSA128BRegisterClass(MCInst &Inst, 157 unsigned RegNo, 158 uint64_t Address, 159 const void *Decoder); 160 161 static DecodeStatus DecodeMSA128HRegisterClass(MCInst &Inst, 162 unsigned RegNo, 163 uint64_t Address, 164 const void *Decoder); 165 166 static DecodeStatus DecodeMSA128WRegisterClass(MCInst &Inst, 167 unsigned RegNo, 168 uint64_t Address, 169 const void *Decoder); 170 171 static DecodeStatus DecodeMSA128DRegisterClass(MCInst &Inst, 172 unsigned RegNo, 173 uint64_t Address, 174 const void *Decoder); 175 176 static DecodeStatus DecodeMSACtrlRegisterClass(MCInst &Inst, 177 unsigned RegNo, 178 uint64_t Address, 179 const void *Decoder); 180 181 static DecodeStatus DecodeCOP0RegisterClass(MCInst &Inst, 182 unsigned RegNo, 183 uint64_t Address, 184 const void *Decoder); 185 186 static DecodeStatus DecodeCOP2RegisterClass(MCInst &Inst, 187 unsigned RegNo, 188 uint64_t Address, 189 const void *Decoder); 190 191 static DecodeStatus DecodeBranchTarget(MCInst &Inst, 192 unsigned Offset, 193 uint64_t Address, 194 const void *Decoder); 195 196 static DecodeStatus DecodeJumpTarget(MCInst &Inst, 197 unsigned Insn, 198 uint64_t Address, 199 const void *Decoder); 200 201 static DecodeStatus DecodeBranchTarget21(MCInst &Inst, 202 unsigned Offset, 203 uint64_t Address, 204 const void *Decoder); 205 206 static DecodeStatus DecodeBranchTarget26(MCInst &Inst, 207 unsigned Offset, 208 uint64_t Address, 209 const void *Decoder); 210 211 // DecodeBranchTarget7MM - Decode microMIPS branch offset, which is 212 // shifted left by 1 bit. 213 static DecodeStatus DecodeBranchTarget7MM(MCInst &Inst, 214 unsigned Offset, 215 uint64_t Address, 216 const void *Decoder); 217 218 // DecodeBranchTarget10MM - Decode microMIPS branch offset, which is 219 // shifted left by 1 bit. 220 static DecodeStatus DecodeBranchTarget10MM(MCInst &Inst, 221 unsigned Offset, 222 uint64_t Address, 223 const void *Decoder); 224 225 // DecodeBranchTargetMM - Decode microMIPS branch offset, which is 226 // shifted left by 1 bit. 227 static DecodeStatus DecodeBranchTargetMM(MCInst &Inst, 228 unsigned Offset, 229 uint64_t Address, 230 const void *Decoder); 231 232 // DecodeBranchTarget26MM - Decode microMIPS branch offset, which is 233 // shifted left by 1 bit. 234 static DecodeStatus DecodeBranchTarget26MM(MCInst &Inst, 235 unsigned Offset, 236 uint64_t Address, 237 const void *Decoder); 238 239 // DecodeJumpTargetMM - Decode microMIPS jump target, which is 240 // shifted left by 1 bit. 241 static DecodeStatus DecodeJumpTargetMM(MCInst &Inst, 242 unsigned Insn, 243 uint64_t Address, 244 const void *Decoder); 245 246 static DecodeStatus DecodeMem(MCInst &Inst, 247 unsigned Insn, 248 uint64_t Address, 249 const void *Decoder); 250 251 static DecodeStatus DecodeMemEVA(MCInst &Inst, 252 unsigned Insn, 253 uint64_t Address, 254 const void *Decoder); 255 256 static DecodeStatus DecodeLoadByte9(MCInst &Inst, 257 unsigned Insn, 258 uint64_t Address, 259 const void *Decoder); 260 261 static DecodeStatus DecodeLoadByte15(MCInst &Inst, 262 unsigned Insn, 263 uint64_t Address, 264 const void *Decoder); 265 266 static DecodeStatus DecodeCacheOp(MCInst &Inst, 267 unsigned Insn, 268 uint64_t Address, 269 const void *Decoder); 270 271 static DecodeStatus DecodeCacheeOp_CacheOpR6(MCInst &Inst, 272 unsigned Insn, 273 uint64_t Address, 274 const void *Decoder); 275 276 static DecodeStatus DecodeCacheOpMM(MCInst &Inst, 277 unsigned Insn, 278 uint64_t Address, 279 const void *Decoder); 280 281 static DecodeStatus DecodeStoreEvaOpMM(MCInst &Inst, 282 unsigned Insn, 283 uint64_t Address, 284 const void *Decoder); 285 286 static DecodeStatus DecodePrefeOpMM(MCInst &Inst, 287 unsigned Insn, 288 uint64_t Address, 289 const void *Decoder); 290 291 static DecodeStatus DecodeSyncI(MCInst &Inst, 292 unsigned Insn, 293 uint64_t Address, 294 const void *Decoder); 295 296 static DecodeStatus DecodeSynciR6(MCInst &Inst, 297 unsigned Insn, 298 uint64_t Address, 299 const void *Decoder); 300 301 static DecodeStatus DecodeMSA128Mem(MCInst &Inst, unsigned Insn, 302 uint64_t Address, const void *Decoder); 303 304 static DecodeStatus DecodeMemMMImm4(MCInst &Inst, 305 unsigned Insn, 306 uint64_t Address, 307 const void *Decoder); 308 309 static DecodeStatus DecodeMemMMSPImm5Lsl2(MCInst &Inst, 310 unsigned Insn, 311 uint64_t Address, 312 const void *Decoder); 313 314 static DecodeStatus DecodeMemMMGPImm7Lsl2(MCInst &Inst, 315 unsigned Insn, 316 uint64_t Address, 317 const void *Decoder); 318 319 static DecodeStatus DecodeMemMMReglistImm4Lsl2(MCInst &Inst, 320 unsigned Insn, 321 uint64_t Address, 322 const void *Decoder); 323 324 static DecodeStatus DecodeMemMMImm9(MCInst &Inst, 325 unsigned Insn, 326 uint64_t Address, 327 const void *Decoder); 328 329 static DecodeStatus DecodeMemMMImm12(MCInst &Inst, 330 unsigned Insn, 331 uint64_t Address, 332 const void *Decoder); 333 334 static DecodeStatus DecodeMemMMImm16(MCInst &Inst, 335 unsigned Insn, 336 uint64_t Address, 337 const void *Decoder); 338 339 static DecodeStatus DecodeFMem(MCInst &Inst, unsigned Insn, 340 uint64_t Address, 341 const void *Decoder); 342 343 static DecodeStatus DecodeFMem2(MCInst &Inst, unsigned Insn, 344 uint64_t Address, 345 const void *Decoder); 346 347 static DecodeStatus DecodeFMem3(MCInst &Inst, unsigned Insn, 348 uint64_t Address, 349 const void *Decoder); 350 351 static DecodeStatus DecodeFMemCop2R6(MCInst &Inst, unsigned Insn, 352 uint64_t Address, 353 const void *Decoder); 354 355 static DecodeStatus DecodeSpecial3LlSc(MCInst &Inst, 356 unsigned Insn, 357 uint64_t Address, 358 const void *Decoder); 359 360 static DecodeStatus DecodeAddiur2Simm7(MCInst &Inst, 361 unsigned Value, 362 uint64_t Address, 363 const void *Decoder); 364 365 static DecodeStatus DecodeUImm6Lsl2(MCInst &Inst, 366 unsigned Value, 367 uint64_t Address, 368 const void *Decoder); 369 370 static DecodeStatus DecodeLiSimm7(MCInst &Inst, 371 unsigned Value, 372 uint64_t Address, 373 const void *Decoder); 374 375 static DecodeStatus DecodePOOL16BEncodedField(MCInst &Inst, 376 unsigned Value, 377 uint64_t Address, 378 const void *Decoder); 379 380 static DecodeStatus DecodeSimm4(MCInst &Inst, 381 unsigned Value, 382 uint64_t Address, 383 const void *Decoder); 384 385 static DecodeStatus DecodeSimm16(MCInst &Inst, 386 unsigned Insn, 387 uint64_t Address, 388 const void *Decoder); 389 390 template <unsigned Bits, int Offset> 391 static DecodeStatus DecodeUImmWithOffset(MCInst &Inst, unsigned Value, 392 uint64_t Address, const void *Decoder); 393 394 static DecodeStatus DecodeInsSize(MCInst &Inst, 395 unsigned Insn, 396 uint64_t Address, 397 const void *Decoder); 398 399 static DecodeStatus DecodeSimm19Lsl2(MCInst &Inst, unsigned Insn, 400 uint64_t Address, const void *Decoder); 401 402 static DecodeStatus DecodeSimm18Lsl3(MCInst &Inst, unsigned Insn, 403 uint64_t Address, const void *Decoder); 404 405 static DecodeStatus DecodeSimm9SP(MCInst &Inst, unsigned Insn, 406 uint64_t Address, const void *Decoder); 407 408 static DecodeStatus DecodeANDI16Imm(MCInst &Inst, unsigned Insn, 409 uint64_t Address, const void *Decoder); 410 411 static DecodeStatus DecodeUImm5lsl2(MCInst &Inst, unsigned Insn, 412 uint64_t Address, const void *Decoder); 413 414 static DecodeStatus DecodeSimm23Lsl2(MCInst &Inst, unsigned Insn, 415 uint64_t Address, const void *Decoder); 416 417 /// INSVE_[BHWD] have an implicit operand that the generated decoder doesn't 418 /// handle. 419 template <typename InsnType> 420 static DecodeStatus DecodeINSVE_DF(MCInst &MI, InsnType insn, uint64_t Address, 421 const void *Decoder); 422 423 template <typename InsnType> 424 static DecodeStatus 425 DecodeAddiGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, 426 const void *Decoder); 427 428 template <typename InsnType> 429 static DecodeStatus 430 DecodeDaddiGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, 431 const void *Decoder); 432 433 template <typename InsnType> 434 static DecodeStatus 435 DecodeBlezlGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, 436 const void *Decoder); 437 438 template <typename InsnType> 439 static DecodeStatus 440 DecodeBgtzlGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, 441 const void *Decoder); 442 443 template <typename InsnType> 444 static DecodeStatus 445 DecodeBgtzGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, 446 const void *Decoder); 447 448 template <typename InsnType> 449 static DecodeStatus 450 DecodeBlezGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, 451 const void *Decoder); 452 453 static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Insn, 454 uint64_t Address, 455 const void *Decoder); 456 457 static DecodeStatus DecodeRegListOperand16(MCInst &Inst, unsigned Insn, 458 uint64_t Address, 459 const void *Decoder); 460 461 static DecodeStatus DecodeMovePRegPair(MCInst &Inst, unsigned Insn, 462 uint64_t Address, 463 const void *Decoder); 464 465 namespace llvm { 466 extern Target TheMipselTarget, TheMipsTarget, TheMips64Target, 467 TheMips64elTarget; 468 } 469 470 static MCDisassembler *createMipsDisassembler( 471 const Target &T, 472 const MCSubtargetInfo &STI, 473 MCContext &Ctx) { 474 return new MipsDisassembler(STI, Ctx, true); 475 } 476 477 static MCDisassembler *createMipselDisassembler( 478 const Target &T, 479 const MCSubtargetInfo &STI, 480 MCContext &Ctx) { 481 return new MipsDisassembler(STI, Ctx, false); 482 } 483 484 extern "C" void LLVMInitializeMipsDisassembler() { 485 // Register the disassembler. 486 TargetRegistry::RegisterMCDisassembler(TheMipsTarget, 487 createMipsDisassembler); 488 TargetRegistry::RegisterMCDisassembler(TheMipselTarget, 489 createMipselDisassembler); 490 TargetRegistry::RegisterMCDisassembler(TheMips64Target, 491 createMipsDisassembler); 492 TargetRegistry::RegisterMCDisassembler(TheMips64elTarget, 493 createMipselDisassembler); 494 } 495 496 #include "MipsGenDisassemblerTables.inc" 497 498 static unsigned getReg(const void *D, unsigned RC, unsigned RegNo) { 499 const MipsDisassembler *Dis = static_cast<const MipsDisassembler*>(D); 500 const MCRegisterInfo *RegInfo = Dis->getContext().getRegisterInfo(); 501 return *(RegInfo->getRegClass(RC).begin() + RegNo); 502 } 503 504 template <typename InsnType> 505 static DecodeStatus DecodeINSVE_DF(MCInst &MI, InsnType insn, uint64_t Address, 506 const void *Decoder) { 507 typedef DecodeStatus (*DecodeFN)(MCInst &, unsigned, uint64_t, const void *); 508 // The size of the n field depends on the element size 509 // The register class also depends on this. 510 InsnType tmp = fieldFromInstruction(insn, 17, 5); 511 unsigned NSize = 0; 512 DecodeFN RegDecoder = nullptr; 513 if ((tmp & 0x18) == 0x00) { // INSVE_B 514 NSize = 4; 515 RegDecoder = DecodeMSA128BRegisterClass; 516 } else if ((tmp & 0x1c) == 0x10) { // INSVE_H 517 NSize = 3; 518 RegDecoder = DecodeMSA128HRegisterClass; 519 } else if ((tmp & 0x1e) == 0x18) { // INSVE_W 520 NSize = 2; 521 RegDecoder = DecodeMSA128WRegisterClass; 522 } else if ((tmp & 0x1f) == 0x1c) { // INSVE_D 523 NSize = 1; 524 RegDecoder = DecodeMSA128DRegisterClass; 525 } else 526 llvm_unreachable("Invalid encoding"); 527 528 assert(NSize != 0 && RegDecoder != nullptr); 529 530 // $wd 531 tmp = fieldFromInstruction(insn, 6, 5); 532 if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler::Fail) 533 return MCDisassembler::Fail; 534 // $wd_in 535 if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler::Fail) 536 return MCDisassembler::Fail; 537 // $n 538 tmp = fieldFromInstruction(insn, 16, NSize); 539 MI.addOperand(MCOperand::createImm(tmp)); 540 // $ws 541 tmp = fieldFromInstruction(insn, 11, 5); 542 if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler::Fail) 543 return MCDisassembler::Fail; 544 // $n2 545 MI.addOperand(MCOperand::createImm(0)); 546 547 return MCDisassembler::Success; 548 } 549 550 template <typename InsnType> 551 static DecodeStatus DecodeAddiGroupBranch(MCInst &MI, InsnType insn, 552 uint64_t Address, 553 const void *Decoder) { 554 // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled 555 // (otherwise we would have matched the ADDI instruction from the earlier 556 // ISA's instead). 557 // 558 // We have: 559 // 0b001000 sssss ttttt iiiiiiiiiiiiiiii 560 // BOVC if rs >= rt 561 // BEQZALC if rs == 0 && rt != 0 562 // BEQC if rs < rt && rs != 0 563 564 InsnType Rs = fieldFromInstruction(insn, 21, 5); 565 InsnType Rt = fieldFromInstruction(insn, 16, 5); 566 InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; 567 bool HasRs = false; 568 569 if (Rs >= Rt) { 570 MI.setOpcode(Mips::BOVC); 571 HasRs = true; 572 } else if (Rs != 0 && Rs < Rt) { 573 MI.setOpcode(Mips::BEQC); 574 HasRs = true; 575 } else 576 MI.setOpcode(Mips::BEQZALC); 577 578 if (HasRs) 579 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 580 Rs))); 581 582 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 583 Rt))); 584 MI.addOperand(MCOperand::createImm(Imm)); 585 586 return MCDisassembler::Success; 587 } 588 589 template <typename InsnType> 590 static DecodeStatus DecodeDaddiGroupBranch(MCInst &MI, InsnType insn, 591 uint64_t Address, 592 const void *Decoder) { 593 // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled 594 // (otherwise we would have matched the ADDI instruction from the earlier 595 // ISA's instead). 596 // 597 // We have: 598 // 0b011000 sssss ttttt iiiiiiiiiiiiiiii 599 // BNVC if rs >= rt 600 // BNEZALC if rs == 0 && rt != 0 601 // BNEC if rs < rt && rs != 0 602 603 InsnType Rs = fieldFromInstruction(insn, 21, 5); 604 InsnType Rt = fieldFromInstruction(insn, 16, 5); 605 InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; 606 bool HasRs = false; 607 608 if (Rs >= Rt) { 609 MI.setOpcode(Mips::BNVC); 610 HasRs = true; 611 } else if (Rs != 0 && Rs < Rt) { 612 MI.setOpcode(Mips::BNEC); 613 HasRs = true; 614 } else 615 MI.setOpcode(Mips::BNEZALC); 616 617 if (HasRs) 618 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 619 Rs))); 620 621 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 622 Rt))); 623 MI.addOperand(MCOperand::createImm(Imm)); 624 625 return MCDisassembler::Success; 626 } 627 628 template <typename InsnType> 629 static DecodeStatus DecodeBlezlGroupBranch(MCInst &MI, InsnType insn, 630 uint64_t Address, 631 const void *Decoder) { 632 // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled 633 // (otherwise we would have matched the BLEZL instruction from the earlier 634 // ISA's instead). 635 // 636 // We have: 637 // 0b010110 sssss ttttt iiiiiiiiiiiiiiii 638 // Invalid if rs == 0 639 // BLEZC if rs == 0 && rt != 0 640 // BGEZC if rs == rt && rt != 0 641 // BGEC if rs != rt && rs != 0 && rt != 0 642 643 InsnType Rs = fieldFromInstruction(insn, 21, 5); 644 InsnType Rt = fieldFromInstruction(insn, 16, 5); 645 InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; 646 bool HasRs = false; 647 648 if (Rt == 0) 649 return MCDisassembler::Fail; 650 else if (Rs == 0) 651 MI.setOpcode(Mips::BLEZC); 652 else if (Rs == Rt) 653 MI.setOpcode(Mips::BGEZC); 654 else { 655 HasRs = true; 656 MI.setOpcode(Mips::BGEC); 657 } 658 659 if (HasRs) 660 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 661 Rs))); 662 663 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 664 Rt))); 665 666 MI.addOperand(MCOperand::createImm(Imm)); 667 668 return MCDisassembler::Success; 669 } 670 671 template <typename InsnType> 672 static DecodeStatus DecodeBgtzlGroupBranch(MCInst &MI, InsnType insn, 673 uint64_t Address, 674 const void *Decoder) { 675 // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled 676 // (otherwise we would have matched the BGTZL instruction from the earlier 677 // ISA's instead). 678 // 679 // We have: 680 // 0b010111 sssss ttttt iiiiiiiiiiiiiiii 681 // Invalid if rs == 0 682 // BGTZC if rs == 0 && rt != 0 683 // BLTZC if rs == rt && rt != 0 684 // BLTC if rs != rt && rs != 0 && rt != 0 685 686 bool HasRs = false; 687 688 InsnType Rs = fieldFromInstruction(insn, 21, 5); 689 InsnType Rt = fieldFromInstruction(insn, 16, 5); 690 InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; 691 692 if (Rt == 0) 693 return MCDisassembler::Fail; 694 else if (Rs == 0) 695 MI.setOpcode(Mips::BGTZC); 696 else if (Rs == Rt) 697 MI.setOpcode(Mips::BLTZC); 698 else { 699 MI.setOpcode(Mips::BLTC); 700 HasRs = true; 701 } 702 703 if (HasRs) 704 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 705 Rs))); 706 707 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 708 Rt))); 709 710 MI.addOperand(MCOperand::createImm(Imm)); 711 712 return MCDisassembler::Success; 713 } 714 715 template <typename InsnType> 716 static DecodeStatus DecodeBgtzGroupBranch(MCInst &MI, InsnType insn, 717 uint64_t Address, 718 const void *Decoder) { 719 // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled 720 // (otherwise we would have matched the BGTZ instruction from the earlier 721 // ISA's instead). 722 // 723 // We have: 724 // 0b000111 sssss ttttt iiiiiiiiiiiiiiii 725 // BGTZ if rt == 0 726 // BGTZALC if rs == 0 && rt != 0 727 // BLTZALC if rs != 0 && rs == rt 728 // BLTUC if rs != 0 && rs != rt 729 730 InsnType Rs = fieldFromInstruction(insn, 21, 5); 731 InsnType Rt = fieldFromInstruction(insn, 16, 5); 732 InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; 733 bool HasRs = false; 734 bool HasRt = false; 735 736 if (Rt == 0) { 737 MI.setOpcode(Mips::BGTZ); 738 HasRs = true; 739 } else if (Rs == 0) { 740 MI.setOpcode(Mips::BGTZALC); 741 HasRt = true; 742 } else if (Rs == Rt) { 743 MI.setOpcode(Mips::BLTZALC); 744 HasRs = true; 745 } else { 746 MI.setOpcode(Mips::BLTUC); 747 HasRs = true; 748 HasRt = true; 749 } 750 751 if (HasRs) 752 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 753 Rs))); 754 755 if (HasRt) 756 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 757 Rt))); 758 759 MI.addOperand(MCOperand::createImm(Imm)); 760 761 return MCDisassembler::Success; 762 } 763 764 template <typename InsnType> 765 static DecodeStatus DecodeBlezGroupBranch(MCInst &MI, InsnType insn, 766 uint64_t Address, 767 const void *Decoder) { 768 // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled 769 // (otherwise we would have matched the BLEZL instruction from the earlier 770 // ISA's instead). 771 // 772 // We have: 773 // 0b000110 sssss ttttt iiiiiiiiiiiiiiii 774 // Invalid if rs == 0 775 // BLEZALC if rs == 0 && rt != 0 776 // BGEZALC if rs == rt && rt != 0 777 // BGEUC if rs != rt && rs != 0 && rt != 0 778 779 InsnType Rs = fieldFromInstruction(insn, 21, 5); 780 InsnType Rt = fieldFromInstruction(insn, 16, 5); 781 InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; 782 bool HasRs = false; 783 784 if (Rt == 0) 785 return MCDisassembler::Fail; 786 else if (Rs == 0) 787 MI.setOpcode(Mips::BLEZALC); 788 else if (Rs == Rt) 789 MI.setOpcode(Mips::BGEZALC); 790 else { 791 HasRs = true; 792 MI.setOpcode(Mips::BGEUC); 793 } 794 795 if (HasRs) 796 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 797 Rs))); 798 MI.addOperand(MCOperand::createReg(getReg(Decoder, Mips::GPR32RegClassID, 799 Rt))); 800 801 MI.addOperand(MCOperand::createImm(Imm)); 802 803 return MCDisassembler::Success; 804 } 805 806 /// Read two bytes from the ArrayRef and return 16 bit halfword sorted 807 /// according to the given endianess. 808 static DecodeStatus readInstruction16(ArrayRef<uint8_t> Bytes, uint64_t Address, 809 uint64_t &Size, uint32_t &Insn, 810 bool IsBigEndian) { 811 // We want to read exactly 2 Bytes of data. 812 if (Bytes.size() < 2) { 813 Size = 0; 814 return MCDisassembler::Fail; 815 } 816 817 if (IsBigEndian) { 818 Insn = (Bytes[0] << 8) | Bytes[1]; 819 } else { 820 Insn = (Bytes[1] << 8) | Bytes[0]; 821 } 822 823 return MCDisassembler::Success; 824 } 825 826 /// Read four bytes from the ArrayRef and return 32 bit word sorted 827 /// according to the given endianess 828 static DecodeStatus readInstruction32(ArrayRef<uint8_t> Bytes, uint64_t Address, 829 uint64_t &Size, uint32_t &Insn, 830 bool IsBigEndian, bool IsMicroMips) { 831 // We want to read exactly 4 Bytes of data. 832 if (Bytes.size() < 4) { 833 Size = 0; 834 return MCDisassembler::Fail; 835 } 836 837 // High 16 bits of a 32-bit microMIPS instruction (where the opcode is) 838 // always precede the low 16 bits in the instruction stream (that is, they 839 // are placed at lower addresses in the instruction stream). 840 // 841 // microMIPS byte ordering: 842 // Big-endian: 0 | 1 | 2 | 3 843 // Little-endian: 1 | 0 | 3 | 2 844 845 if (IsBigEndian) { 846 // Encoded as a big-endian 32-bit word in the stream. 847 Insn = 848 (Bytes[3] << 0) | (Bytes[2] << 8) | (Bytes[1] << 16) | (Bytes[0] << 24); 849 } else { 850 if (IsMicroMips) { 851 Insn = (Bytes[2] << 0) | (Bytes[3] << 8) | (Bytes[0] << 16) | 852 (Bytes[1] << 24); 853 } else { 854 Insn = (Bytes[0] << 0) | (Bytes[1] << 8) | (Bytes[2] << 16) | 855 (Bytes[3] << 24); 856 } 857 } 858 859 return MCDisassembler::Success; 860 } 861 862 DecodeStatus MipsDisassembler::getInstruction(MCInst &Instr, uint64_t &Size, 863 ArrayRef<uint8_t> Bytes, 864 uint64_t Address, 865 raw_ostream &VStream, 866 raw_ostream &CStream) const { 867 uint32_t Insn; 868 DecodeStatus Result; 869 870 if (IsMicroMips) { 871 Result = readInstruction16(Bytes, Address, Size, Insn, IsBigEndian); 872 if (Result == MCDisassembler::Fail) 873 return MCDisassembler::Fail; 874 875 if (hasMips32r6()) { 876 DEBUG(dbgs() << "Trying MicroMipsR616 table (16-bit instructions):\n"); 877 // Calling the auto-generated decoder function for microMIPS32R6 878 // (and microMIPS64R6) 16-bit instructions. 879 Result = decodeInstruction(DecoderTableMicroMipsR616, Instr, Insn, 880 Address, this, STI); 881 if (Result != MCDisassembler::Fail) { 882 Size = 2; 883 return Result; 884 } 885 } 886 887 DEBUG(dbgs() << "Trying MicroMips16 table (16-bit instructions):\n"); 888 // Calling the auto-generated decoder function for microMIPS 16-bit 889 // instructions. 890 Result = decodeInstruction(DecoderTableMicroMips16, Instr, Insn, Address, 891 this, STI); 892 if (Result != MCDisassembler::Fail) { 893 Size = 2; 894 return Result; 895 } 896 897 Result = readInstruction32(Bytes, Address, Size, Insn, IsBigEndian, true); 898 if (Result == MCDisassembler::Fail) 899 return MCDisassembler::Fail; 900 901 if (hasMips32r6()) { 902 DEBUG(dbgs() << "Trying MicroMips32r632 table (32-bit instructions):\n"); 903 // Calling the auto-generated decoder function. 904 Result = decodeInstruction(DecoderTableMicroMipsR632, Instr, Insn, Address, 905 this, STI); 906 if (Result != MCDisassembler::Fail) { 907 Size = 4; 908 return Result; 909 } 910 } 911 912 DEBUG(dbgs() << "Trying MicroMips32 table (32-bit instructions):\n"); 913 // Calling the auto-generated decoder function. 914 Result = decodeInstruction(DecoderTableMicroMips32, Instr, Insn, Address, 915 this, STI); 916 if (Result != MCDisassembler::Fail) { 917 Size = 4; 918 return Result; 919 } 920 // This is an invalid instruction. Let the disassembler move forward by the 921 // minimum instruction size. 922 Size = 2; 923 return MCDisassembler::Fail; 924 } 925 926 Result = readInstruction32(Bytes, Address, Size, Insn, IsBigEndian, false); 927 if (Result == MCDisassembler::Fail) { 928 Size = 4; 929 return MCDisassembler::Fail; 930 } 931 932 if (hasCOP3()) { 933 DEBUG(dbgs() << "Trying COP3_ table (32-bit opcodes):\n"); 934 Result = 935 decodeInstruction(DecoderTableCOP3_32, Instr, Insn, Address, this, STI); 936 if (Result != MCDisassembler::Fail) { 937 Size = 4; 938 return Result; 939 } 940 } 941 942 if (hasMips32r6() && isGP64()) { 943 DEBUG(dbgs() << "Trying Mips32r6_64r6 (GPR64) table (32-bit opcodes):\n"); 944 Result = decodeInstruction(DecoderTableMips32r6_64r6_GP6432, Instr, Insn, 945 Address, this, STI); 946 if (Result != MCDisassembler::Fail) { 947 Size = 4; 948 return Result; 949 } 950 } 951 952 if (hasMips32r6()) { 953 DEBUG(dbgs() << "Trying Mips32r6_64r6 table (32-bit opcodes):\n"); 954 Result = decodeInstruction(DecoderTableMips32r6_64r632, Instr, Insn, 955 Address, this, STI); 956 if (Result != MCDisassembler::Fail) { 957 Size = 4; 958 return Result; 959 } 960 } 961 962 if (hasCnMips()) { 963 DEBUG(dbgs() << "Trying CnMips table (32-bit opcodes):\n"); 964 Result = decodeInstruction(DecoderTableCnMips32, Instr, Insn, 965 Address, this, STI); 966 if (Result != MCDisassembler::Fail) { 967 Size = 4; 968 return Result; 969 } 970 } 971 972 if (isGP64()) { 973 DEBUG(dbgs() << "Trying Mips64 (GPR64) table (32-bit opcodes):\n"); 974 Result = decodeInstruction(DecoderTableMips6432, Instr, Insn, 975 Address, this, STI); 976 if (Result != MCDisassembler::Fail) { 977 Size = 4; 978 return Result; 979 } 980 } 981 982 DEBUG(dbgs() << "Trying Mips table (32-bit opcodes):\n"); 983 // Calling the auto-generated decoder function. 984 Result = 985 decodeInstruction(DecoderTableMips32, Instr, Insn, Address, this, STI); 986 if (Result != MCDisassembler::Fail) { 987 Size = 4; 988 return Result; 989 } 990 991 Size = 4; 992 return MCDisassembler::Fail; 993 } 994 995 static DecodeStatus DecodeCPU16RegsRegisterClass(MCInst &Inst, 996 unsigned RegNo, 997 uint64_t Address, 998 const void *Decoder) { 999 1000 return MCDisassembler::Fail; 1001 1002 } 1003 1004 static DecodeStatus DecodeGPR64RegisterClass(MCInst &Inst, 1005 unsigned RegNo, 1006 uint64_t Address, 1007 const void *Decoder) { 1008 1009 if (RegNo > 31) 1010 return MCDisassembler::Fail; 1011 1012 unsigned Reg = getReg(Decoder, Mips::GPR64RegClassID, RegNo); 1013 Inst.addOperand(MCOperand::createReg(Reg)); 1014 return MCDisassembler::Success; 1015 } 1016 1017 static DecodeStatus DecodeGPRMM16RegisterClass(MCInst &Inst, 1018 unsigned RegNo, 1019 uint64_t Address, 1020 const void *Decoder) { 1021 if (RegNo > 7) 1022 return MCDisassembler::Fail; 1023 unsigned Reg = getReg(Decoder, Mips::GPRMM16RegClassID, RegNo); 1024 Inst.addOperand(MCOperand::createReg(Reg)); 1025 return MCDisassembler::Success; 1026 } 1027 1028 static DecodeStatus DecodeGPRMM16ZeroRegisterClass(MCInst &Inst, 1029 unsigned RegNo, 1030 uint64_t Address, 1031 const void *Decoder) { 1032 if (RegNo > 7) 1033 return MCDisassembler::Fail; 1034 unsigned Reg = getReg(Decoder, Mips::GPRMM16ZeroRegClassID, RegNo); 1035 Inst.addOperand(MCOperand::createReg(Reg)); 1036 return MCDisassembler::Success; 1037 } 1038 1039 static DecodeStatus DecodeGPRMM16MovePRegisterClass(MCInst &Inst, 1040 unsigned RegNo, 1041 uint64_t Address, 1042 const void *Decoder) { 1043 if (RegNo > 7) 1044 return MCDisassembler::Fail; 1045 unsigned Reg = getReg(Decoder, Mips::GPRMM16MovePRegClassID, RegNo); 1046 Inst.addOperand(MCOperand::createReg(Reg)); 1047 return MCDisassembler::Success; 1048 } 1049 1050 static DecodeStatus DecodeGPR32RegisterClass(MCInst &Inst, 1051 unsigned RegNo, 1052 uint64_t Address, 1053 const void *Decoder) { 1054 if (RegNo > 31) 1055 return MCDisassembler::Fail; 1056 unsigned Reg = getReg(Decoder, Mips::GPR32RegClassID, RegNo); 1057 Inst.addOperand(MCOperand::createReg(Reg)); 1058 return MCDisassembler::Success; 1059 } 1060 1061 static DecodeStatus DecodePtrRegisterClass(MCInst &Inst, 1062 unsigned RegNo, 1063 uint64_t Address, 1064 const void *Decoder) { 1065 if (static_cast<const MipsDisassembler *>(Decoder)->isGP64()) 1066 return DecodeGPR64RegisterClass(Inst, RegNo, Address, Decoder); 1067 1068 return DecodeGPR32RegisterClass(Inst, RegNo, Address, Decoder); 1069 } 1070 1071 static DecodeStatus DecodeDSPRRegisterClass(MCInst &Inst, 1072 unsigned RegNo, 1073 uint64_t Address, 1074 const void *Decoder) { 1075 return DecodeGPR32RegisterClass(Inst, RegNo, Address, Decoder); 1076 } 1077 1078 static DecodeStatus DecodeFGR64RegisterClass(MCInst &Inst, 1079 unsigned RegNo, 1080 uint64_t Address, 1081 const void *Decoder) { 1082 if (RegNo > 31) 1083 return MCDisassembler::Fail; 1084 1085 unsigned Reg = getReg(Decoder, Mips::FGR64RegClassID, RegNo); 1086 Inst.addOperand(MCOperand::createReg(Reg)); 1087 return MCDisassembler::Success; 1088 } 1089 1090 static DecodeStatus DecodeFGR32RegisterClass(MCInst &Inst, 1091 unsigned RegNo, 1092 uint64_t Address, 1093 const void *Decoder) { 1094 if (RegNo > 31) 1095 return MCDisassembler::Fail; 1096 1097 unsigned Reg = getReg(Decoder, Mips::FGR32RegClassID, RegNo); 1098 Inst.addOperand(MCOperand::createReg(Reg)); 1099 return MCDisassembler::Success; 1100 } 1101 1102 static DecodeStatus DecodeCCRRegisterClass(MCInst &Inst, 1103 unsigned RegNo, 1104 uint64_t Address, 1105 const void *Decoder) { 1106 if (RegNo > 31) 1107 return MCDisassembler::Fail; 1108 unsigned Reg = getReg(Decoder, Mips::CCRRegClassID, RegNo); 1109 Inst.addOperand(MCOperand::createReg(Reg)); 1110 return MCDisassembler::Success; 1111 } 1112 1113 static DecodeStatus DecodeFCCRegisterClass(MCInst &Inst, 1114 unsigned RegNo, 1115 uint64_t Address, 1116 const void *Decoder) { 1117 if (RegNo > 7) 1118 return MCDisassembler::Fail; 1119 unsigned Reg = getReg(Decoder, Mips::FCCRegClassID, RegNo); 1120 Inst.addOperand(MCOperand::createReg(Reg)); 1121 return MCDisassembler::Success; 1122 } 1123 1124 static DecodeStatus DecodeFGRCCRegisterClass(MCInst &Inst, unsigned RegNo, 1125 uint64_t Address, 1126 const void *Decoder) { 1127 if (RegNo > 31) 1128 return MCDisassembler::Fail; 1129 1130 unsigned Reg = getReg(Decoder, Mips::FGRCCRegClassID, RegNo); 1131 Inst.addOperand(MCOperand::createReg(Reg)); 1132 return MCDisassembler::Success; 1133 } 1134 1135 static DecodeStatus DecodeMem(MCInst &Inst, 1136 unsigned Insn, 1137 uint64_t Address, 1138 const void *Decoder) { 1139 int Offset = SignExtend32<16>(Insn & 0xffff); 1140 unsigned Reg = fieldFromInstruction(Insn, 16, 5); 1141 unsigned Base = fieldFromInstruction(Insn, 21, 5); 1142 1143 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1144 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1145 1146 if (Inst.getOpcode() == Mips::SC || 1147 Inst.getOpcode() == Mips::SCD) 1148 Inst.addOperand(MCOperand::createReg(Reg)); 1149 1150 Inst.addOperand(MCOperand::createReg(Reg)); 1151 Inst.addOperand(MCOperand::createReg(Base)); 1152 Inst.addOperand(MCOperand::createImm(Offset)); 1153 1154 return MCDisassembler::Success; 1155 } 1156 1157 static DecodeStatus DecodeMemEVA(MCInst &Inst, 1158 unsigned Insn, 1159 uint64_t Address, 1160 const void *Decoder) { 1161 int Offset = SignExtend32<9>(Insn >> 7); 1162 unsigned Reg = fieldFromInstruction(Insn, 16, 5); 1163 unsigned Base = fieldFromInstruction(Insn, 21, 5); 1164 1165 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1166 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1167 1168 if (Inst.getOpcode() == Mips::SCE) 1169 Inst.addOperand(MCOperand::createReg(Reg)); 1170 1171 Inst.addOperand(MCOperand::createReg(Reg)); 1172 Inst.addOperand(MCOperand::createReg(Base)); 1173 Inst.addOperand(MCOperand::createImm(Offset)); 1174 1175 return MCDisassembler::Success; 1176 } 1177 1178 static DecodeStatus DecodeLoadByte9(MCInst &Inst, 1179 unsigned Insn, 1180 uint64_t Address, 1181 const void *Decoder) { 1182 int Offset = SignExtend32<9>(Insn & 0x1ff); 1183 unsigned Base = fieldFromInstruction(Insn, 16, 5); 1184 unsigned Reg = fieldFromInstruction(Insn, 21, 5); 1185 1186 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1187 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1188 1189 Inst.addOperand(MCOperand::createReg(Reg)); 1190 Inst.addOperand(MCOperand::createReg(Base)); 1191 Inst.addOperand(MCOperand::createImm(Offset)); 1192 1193 return MCDisassembler::Success; 1194 } 1195 1196 static DecodeStatus DecodeLoadByte15(MCInst &Inst, 1197 unsigned Insn, 1198 uint64_t Address, 1199 const void *Decoder) { 1200 int Offset = SignExtend32<16>(Insn & 0xffff); 1201 unsigned Base = fieldFromInstruction(Insn, 16, 5); 1202 unsigned Reg = fieldFromInstruction(Insn, 21, 5); 1203 1204 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1205 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1206 1207 Inst.addOperand(MCOperand::createReg(Reg)); 1208 Inst.addOperand(MCOperand::createReg(Base)); 1209 Inst.addOperand(MCOperand::createImm(Offset)); 1210 1211 return MCDisassembler::Success; 1212 } 1213 1214 static DecodeStatus DecodeCacheOp(MCInst &Inst, 1215 unsigned Insn, 1216 uint64_t Address, 1217 const void *Decoder) { 1218 int Offset = SignExtend32<16>(Insn & 0xffff); 1219 unsigned Hint = fieldFromInstruction(Insn, 16, 5); 1220 unsigned Base = fieldFromInstruction(Insn, 21, 5); 1221 1222 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1223 1224 Inst.addOperand(MCOperand::createReg(Base)); 1225 Inst.addOperand(MCOperand::createImm(Offset)); 1226 Inst.addOperand(MCOperand::createImm(Hint)); 1227 1228 return MCDisassembler::Success; 1229 } 1230 1231 static DecodeStatus DecodeCacheOpMM(MCInst &Inst, 1232 unsigned Insn, 1233 uint64_t Address, 1234 const void *Decoder) { 1235 int Offset = SignExtend32<12>(Insn & 0xfff); 1236 unsigned Base = fieldFromInstruction(Insn, 16, 5); 1237 unsigned Hint = fieldFromInstruction(Insn, 21, 5); 1238 1239 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1240 1241 Inst.addOperand(MCOperand::createReg(Base)); 1242 Inst.addOperand(MCOperand::createImm(Offset)); 1243 Inst.addOperand(MCOperand::createImm(Hint)); 1244 1245 return MCDisassembler::Success; 1246 } 1247 1248 static DecodeStatus DecodePrefeOpMM(MCInst &Inst, 1249 unsigned Insn, 1250 uint64_t Address, 1251 const void *Decoder) { 1252 int Offset = SignExtend32<9>(Insn & 0x1ff); 1253 unsigned Base = fieldFromInstruction(Insn, 16, 5); 1254 unsigned Hint = fieldFromInstruction(Insn, 21, 5); 1255 1256 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1257 1258 Inst.addOperand(MCOperand::createReg(Base)); 1259 Inst.addOperand(MCOperand::createImm(Offset)); 1260 Inst.addOperand(MCOperand::createImm(Hint)); 1261 1262 return MCDisassembler::Success; 1263 } 1264 1265 static DecodeStatus DecodeCacheeOp_CacheOpR6(MCInst &Inst, 1266 unsigned Insn, 1267 uint64_t Address, 1268 const void *Decoder) { 1269 int Offset = SignExtend32<9>(Insn >> 7); 1270 unsigned Hint = fieldFromInstruction(Insn, 16, 5); 1271 unsigned Base = fieldFromInstruction(Insn, 21, 5); 1272 1273 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1274 1275 Inst.addOperand(MCOperand::createReg(Base)); 1276 Inst.addOperand(MCOperand::createImm(Offset)); 1277 Inst.addOperand(MCOperand::createImm(Hint)); 1278 1279 return MCDisassembler::Success; 1280 } 1281 1282 static DecodeStatus DecodeStoreEvaOpMM(MCInst &Inst, 1283 unsigned Insn, 1284 uint64_t Address, 1285 const void *Decoder) { 1286 int Offset = SignExtend32<9>(Insn & 0x1ff); 1287 unsigned Reg = fieldFromInstruction(Insn, 21, 5); 1288 unsigned Base = fieldFromInstruction(Insn, 16, 5); 1289 1290 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1291 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1292 1293 Inst.addOperand(MCOperand::createReg(Reg)); 1294 Inst.addOperand(MCOperand::createReg(Base)); 1295 Inst.addOperand(MCOperand::createImm(Offset)); 1296 1297 return MCDisassembler::Success; 1298 } 1299 1300 static DecodeStatus DecodeSyncI(MCInst &Inst, 1301 unsigned Insn, 1302 uint64_t Address, 1303 const void *Decoder) { 1304 int Offset = SignExtend32<16>(Insn & 0xffff); 1305 unsigned Base = fieldFromInstruction(Insn, 21, 5); 1306 1307 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1308 1309 Inst.addOperand(MCOperand::createReg(Base)); 1310 Inst.addOperand(MCOperand::createImm(Offset)); 1311 1312 return MCDisassembler::Success; 1313 } 1314 1315 static DecodeStatus DecodeSynciR6(MCInst &Inst, 1316 unsigned Insn, 1317 uint64_t Address, 1318 const void *Decoder) { 1319 int Immediate = SignExtend32<16>(Insn & 0xffff); 1320 unsigned Base = fieldFromInstruction(Insn, 16, 5); 1321 1322 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1323 1324 Inst.addOperand(MCOperand::createReg(Base)); 1325 Inst.addOperand(MCOperand::createImm(Immediate)); 1326 1327 return MCDisassembler::Success; 1328 } 1329 1330 static DecodeStatus DecodeMSA128Mem(MCInst &Inst, unsigned Insn, 1331 uint64_t Address, const void *Decoder) { 1332 int Offset = SignExtend32<10>(fieldFromInstruction(Insn, 16, 10)); 1333 unsigned Reg = fieldFromInstruction(Insn, 6, 5); 1334 unsigned Base = fieldFromInstruction(Insn, 11, 5); 1335 1336 Reg = getReg(Decoder, Mips::MSA128BRegClassID, Reg); 1337 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1338 1339 Inst.addOperand(MCOperand::createReg(Reg)); 1340 Inst.addOperand(MCOperand::createReg(Base)); 1341 1342 // The immediate field of an LD/ST instruction is scaled which means it must 1343 // be multiplied (when decoding) by the size (in bytes) of the instructions' 1344 // data format. 1345 // .b - 1 byte 1346 // .h - 2 bytes 1347 // .w - 4 bytes 1348 // .d - 8 bytes 1349 switch(Inst.getOpcode()) 1350 { 1351 default: 1352 assert (0 && "Unexpected instruction"); 1353 return MCDisassembler::Fail; 1354 break; 1355 case Mips::LD_B: 1356 case Mips::ST_B: 1357 Inst.addOperand(MCOperand::createImm(Offset)); 1358 break; 1359 case Mips::LD_H: 1360 case Mips::ST_H: 1361 Inst.addOperand(MCOperand::createImm(Offset * 2)); 1362 break; 1363 case Mips::LD_W: 1364 case Mips::ST_W: 1365 Inst.addOperand(MCOperand::createImm(Offset * 4)); 1366 break; 1367 case Mips::LD_D: 1368 case Mips::ST_D: 1369 Inst.addOperand(MCOperand::createImm(Offset * 8)); 1370 break; 1371 } 1372 1373 return MCDisassembler::Success; 1374 } 1375 1376 static DecodeStatus DecodeMemMMImm4(MCInst &Inst, 1377 unsigned Insn, 1378 uint64_t Address, 1379 const void *Decoder) { 1380 unsigned Offset = Insn & 0xf; 1381 unsigned Reg = fieldFromInstruction(Insn, 7, 3); 1382 unsigned Base = fieldFromInstruction(Insn, 4, 3); 1383 1384 switch (Inst.getOpcode()) { 1385 case Mips::LBU16_MM: 1386 case Mips::LHU16_MM: 1387 case Mips::LW16_MM: 1388 if (DecodeGPRMM16RegisterClass(Inst, Reg, Address, Decoder) 1389 == MCDisassembler::Fail) 1390 return MCDisassembler::Fail; 1391 break; 1392 case Mips::SB16_MM: 1393 case Mips::SB16_MMR6: 1394 case Mips::SH16_MM: 1395 case Mips::SH16_MMR6: 1396 case Mips::SW16_MM: 1397 case Mips::SW16_MMR6: 1398 if (DecodeGPRMM16ZeroRegisterClass(Inst, Reg, Address, Decoder) 1399 == MCDisassembler::Fail) 1400 return MCDisassembler::Fail; 1401 break; 1402 } 1403 1404 if (DecodeGPRMM16RegisterClass(Inst, Base, Address, Decoder) 1405 == MCDisassembler::Fail) 1406 return MCDisassembler::Fail; 1407 1408 switch (Inst.getOpcode()) { 1409 case Mips::LBU16_MM: 1410 if (Offset == 0xf) 1411 Inst.addOperand(MCOperand::createImm(-1)); 1412 else 1413 Inst.addOperand(MCOperand::createImm(Offset)); 1414 break; 1415 case Mips::SB16_MM: 1416 case Mips::SB16_MMR6: 1417 Inst.addOperand(MCOperand::createImm(Offset)); 1418 break; 1419 case Mips::LHU16_MM: 1420 case Mips::SH16_MM: 1421 case Mips::SH16_MMR6: 1422 Inst.addOperand(MCOperand::createImm(Offset << 1)); 1423 break; 1424 case Mips::LW16_MM: 1425 case Mips::SW16_MM: 1426 case Mips::SW16_MMR6: 1427 Inst.addOperand(MCOperand::createImm(Offset << 2)); 1428 break; 1429 } 1430 1431 return MCDisassembler::Success; 1432 } 1433 1434 static DecodeStatus DecodeMemMMSPImm5Lsl2(MCInst &Inst, 1435 unsigned Insn, 1436 uint64_t Address, 1437 const void *Decoder) { 1438 unsigned Offset = Insn & 0x1F; 1439 unsigned Reg = fieldFromInstruction(Insn, 5, 5); 1440 1441 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1442 1443 Inst.addOperand(MCOperand::createReg(Reg)); 1444 Inst.addOperand(MCOperand::createReg(Mips::SP)); 1445 Inst.addOperand(MCOperand::createImm(Offset << 2)); 1446 1447 return MCDisassembler::Success; 1448 } 1449 1450 static DecodeStatus DecodeMemMMGPImm7Lsl2(MCInst &Inst, 1451 unsigned Insn, 1452 uint64_t Address, 1453 const void *Decoder) { 1454 unsigned Offset = Insn & 0x7F; 1455 unsigned Reg = fieldFromInstruction(Insn, 7, 3); 1456 1457 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1458 1459 Inst.addOperand(MCOperand::createReg(Reg)); 1460 Inst.addOperand(MCOperand::createReg(Mips::GP)); 1461 Inst.addOperand(MCOperand::createImm(Offset << 2)); 1462 1463 return MCDisassembler::Success; 1464 } 1465 1466 static DecodeStatus DecodeMemMMReglistImm4Lsl2(MCInst &Inst, 1467 unsigned Insn, 1468 uint64_t Address, 1469 const void *Decoder) { 1470 int Offset; 1471 switch (Inst.getOpcode()) { 1472 case Mips::LWM16_MMR6: 1473 case Mips::SWM16_MMR6: 1474 Offset = fieldFromInstruction(Insn, 4, 4); 1475 break; 1476 default: 1477 Offset = SignExtend32<4>(Insn & 0xf); 1478 break; 1479 } 1480 1481 if (DecodeRegListOperand16(Inst, Insn, Address, Decoder) 1482 == MCDisassembler::Fail) 1483 return MCDisassembler::Fail; 1484 1485 Inst.addOperand(MCOperand::createReg(Mips::SP)); 1486 Inst.addOperand(MCOperand::createImm(Offset << 2)); 1487 1488 return MCDisassembler::Success; 1489 } 1490 1491 static DecodeStatus DecodeMemMMImm9(MCInst &Inst, 1492 unsigned Insn, 1493 uint64_t Address, 1494 const void *Decoder) { 1495 int Offset = SignExtend32<9>(Insn & 0x1ff); 1496 unsigned Reg = fieldFromInstruction(Insn, 21, 5); 1497 unsigned Base = fieldFromInstruction(Insn, 16, 5); 1498 1499 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1500 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1501 1502 if (Inst.getOpcode() == Mips::SCE_MM) 1503 Inst.addOperand(MCOperand::createReg(Reg)); 1504 1505 Inst.addOperand(MCOperand::createReg(Reg)); 1506 Inst.addOperand(MCOperand::createReg(Base)); 1507 Inst.addOperand(MCOperand::createImm(Offset)); 1508 1509 return MCDisassembler::Success; 1510 } 1511 1512 static DecodeStatus DecodeMemMMImm12(MCInst &Inst, 1513 unsigned Insn, 1514 uint64_t Address, 1515 const void *Decoder) { 1516 int Offset = SignExtend32<12>(Insn & 0x0fff); 1517 unsigned Reg = fieldFromInstruction(Insn, 21, 5); 1518 unsigned Base = fieldFromInstruction(Insn, 16, 5); 1519 1520 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1521 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1522 1523 switch (Inst.getOpcode()) { 1524 case Mips::SWM32_MM: 1525 case Mips::LWM32_MM: 1526 if (DecodeRegListOperand(Inst, Insn, Address, Decoder) 1527 == MCDisassembler::Fail) 1528 return MCDisassembler::Fail; 1529 Inst.addOperand(MCOperand::createReg(Base)); 1530 Inst.addOperand(MCOperand::createImm(Offset)); 1531 break; 1532 case Mips::SC_MM: 1533 Inst.addOperand(MCOperand::createReg(Reg)); 1534 // fallthrough 1535 default: 1536 Inst.addOperand(MCOperand::createReg(Reg)); 1537 if (Inst.getOpcode() == Mips::LWP_MM || Inst.getOpcode() == Mips::SWP_MM) 1538 Inst.addOperand(MCOperand::createReg(Reg+1)); 1539 1540 Inst.addOperand(MCOperand::createReg(Base)); 1541 Inst.addOperand(MCOperand::createImm(Offset)); 1542 } 1543 1544 return MCDisassembler::Success; 1545 } 1546 1547 static DecodeStatus DecodeMemMMImm16(MCInst &Inst, 1548 unsigned Insn, 1549 uint64_t Address, 1550 const void *Decoder) { 1551 int Offset = SignExtend32<16>(Insn & 0xffff); 1552 unsigned Reg = fieldFromInstruction(Insn, 21, 5); 1553 unsigned Base = fieldFromInstruction(Insn, 16, 5); 1554 1555 Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); 1556 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1557 1558 Inst.addOperand(MCOperand::createReg(Reg)); 1559 Inst.addOperand(MCOperand::createReg(Base)); 1560 Inst.addOperand(MCOperand::createImm(Offset)); 1561 1562 return MCDisassembler::Success; 1563 } 1564 1565 static DecodeStatus DecodeFMem(MCInst &Inst, 1566 unsigned Insn, 1567 uint64_t Address, 1568 const void *Decoder) { 1569 int Offset = SignExtend32<16>(Insn & 0xffff); 1570 unsigned Reg = fieldFromInstruction(Insn, 16, 5); 1571 unsigned Base = fieldFromInstruction(Insn, 21, 5); 1572 1573 Reg = getReg(Decoder, Mips::FGR64RegClassID, Reg); 1574 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1575 1576 Inst.addOperand(MCOperand::createReg(Reg)); 1577 Inst.addOperand(MCOperand::createReg(Base)); 1578 Inst.addOperand(MCOperand::createImm(Offset)); 1579 1580 return MCDisassembler::Success; 1581 } 1582 1583 static DecodeStatus DecodeFMem2(MCInst &Inst, 1584 unsigned Insn, 1585 uint64_t Address, 1586 const void *Decoder) { 1587 int Offset = SignExtend32<16>(Insn & 0xffff); 1588 unsigned Reg = fieldFromInstruction(Insn, 16, 5); 1589 unsigned Base = fieldFromInstruction(Insn, 21, 5); 1590 1591 Reg = getReg(Decoder, Mips::COP2RegClassID, Reg); 1592 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1593 1594 Inst.addOperand(MCOperand::createReg(Reg)); 1595 Inst.addOperand(MCOperand::createReg(Base)); 1596 Inst.addOperand(MCOperand::createImm(Offset)); 1597 1598 return MCDisassembler::Success; 1599 } 1600 1601 static DecodeStatus DecodeFMem3(MCInst &Inst, 1602 unsigned Insn, 1603 uint64_t Address, 1604 const void *Decoder) { 1605 int Offset = SignExtend32<16>(Insn & 0xffff); 1606 unsigned Reg = fieldFromInstruction(Insn, 16, 5); 1607 unsigned Base = fieldFromInstruction(Insn, 21, 5); 1608 1609 Reg = getReg(Decoder, Mips::COP3RegClassID, Reg); 1610 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1611 1612 Inst.addOperand(MCOperand::createReg(Reg)); 1613 Inst.addOperand(MCOperand::createReg(Base)); 1614 Inst.addOperand(MCOperand::createImm(Offset)); 1615 1616 return MCDisassembler::Success; 1617 } 1618 1619 static DecodeStatus DecodeFMemCop2R6(MCInst &Inst, 1620 unsigned Insn, 1621 uint64_t Address, 1622 const void *Decoder) { 1623 int Offset = SignExtend32<11>(Insn & 0x07ff); 1624 unsigned Reg = fieldFromInstruction(Insn, 16, 5); 1625 unsigned Base = fieldFromInstruction(Insn, 11, 5); 1626 1627 Reg = getReg(Decoder, Mips::COP2RegClassID, Reg); 1628 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1629 1630 Inst.addOperand(MCOperand::createReg(Reg)); 1631 Inst.addOperand(MCOperand::createReg(Base)); 1632 Inst.addOperand(MCOperand::createImm(Offset)); 1633 1634 return MCDisassembler::Success; 1635 } 1636 static DecodeStatus DecodeSpecial3LlSc(MCInst &Inst, 1637 unsigned Insn, 1638 uint64_t Address, 1639 const void *Decoder) { 1640 int64_t Offset = SignExtend64<9>((Insn >> 7) & 0x1ff); 1641 unsigned Rt = fieldFromInstruction(Insn, 16, 5); 1642 unsigned Base = fieldFromInstruction(Insn, 21, 5); 1643 1644 Rt = getReg(Decoder, Mips::GPR32RegClassID, Rt); 1645 Base = getReg(Decoder, Mips::GPR32RegClassID, Base); 1646 1647 if(Inst.getOpcode() == Mips::SC_R6 || Inst.getOpcode() == Mips::SCD_R6){ 1648 Inst.addOperand(MCOperand::createReg(Rt)); 1649 } 1650 1651 Inst.addOperand(MCOperand::createReg(Rt)); 1652 Inst.addOperand(MCOperand::createReg(Base)); 1653 Inst.addOperand(MCOperand::createImm(Offset)); 1654 1655 return MCDisassembler::Success; 1656 } 1657 1658 static DecodeStatus DecodeHWRegsRegisterClass(MCInst &Inst, 1659 unsigned RegNo, 1660 uint64_t Address, 1661 const void *Decoder) { 1662 // Currently only hardware register 29 is supported. 1663 if (RegNo != 29) 1664 return MCDisassembler::Fail; 1665 Inst.addOperand(MCOperand::createReg(Mips::HWR29)); 1666 return MCDisassembler::Success; 1667 } 1668 1669 static DecodeStatus DecodeAFGR64RegisterClass(MCInst &Inst, 1670 unsigned RegNo, 1671 uint64_t Address, 1672 const void *Decoder) { 1673 if (RegNo > 30 || RegNo %2) 1674 return MCDisassembler::Fail; 1675 1676 ; 1677 unsigned Reg = getReg(Decoder, Mips::AFGR64RegClassID, RegNo /2); 1678 Inst.addOperand(MCOperand::createReg(Reg)); 1679 return MCDisassembler::Success; 1680 } 1681 1682 static DecodeStatus DecodeACC64DSPRegisterClass(MCInst &Inst, 1683 unsigned RegNo, 1684 uint64_t Address, 1685 const void *Decoder) { 1686 if (RegNo >= 4) 1687 return MCDisassembler::Fail; 1688 1689 unsigned Reg = getReg(Decoder, Mips::ACC64DSPRegClassID, RegNo); 1690 Inst.addOperand(MCOperand::createReg(Reg)); 1691 return MCDisassembler::Success; 1692 } 1693 1694 static DecodeStatus DecodeHI32DSPRegisterClass(MCInst &Inst, 1695 unsigned RegNo, 1696 uint64_t Address, 1697 const void *Decoder) { 1698 if (RegNo >= 4) 1699 return MCDisassembler::Fail; 1700 1701 unsigned Reg = getReg(Decoder, Mips::HI32DSPRegClassID, RegNo); 1702 Inst.addOperand(MCOperand::createReg(Reg)); 1703 return MCDisassembler::Success; 1704 } 1705 1706 static DecodeStatus DecodeLO32DSPRegisterClass(MCInst &Inst, 1707 unsigned RegNo, 1708 uint64_t Address, 1709 const void *Decoder) { 1710 if (RegNo >= 4) 1711 return MCDisassembler::Fail; 1712 1713 unsigned Reg = getReg(Decoder, Mips::LO32DSPRegClassID, RegNo); 1714 Inst.addOperand(MCOperand::createReg(Reg)); 1715 return MCDisassembler::Success; 1716 } 1717 1718 static DecodeStatus DecodeMSA128BRegisterClass(MCInst &Inst, 1719 unsigned RegNo, 1720 uint64_t Address, 1721 const void *Decoder) { 1722 if (RegNo > 31) 1723 return MCDisassembler::Fail; 1724 1725 unsigned Reg = getReg(Decoder, Mips::MSA128BRegClassID, RegNo); 1726 Inst.addOperand(MCOperand::createReg(Reg)); 1727 return MCDisassembler::Success; 1728 } 1729 1730 static DecodeStatus DecodeMSA128HRegisterClass(MCInst &Inst, 1731 unsigned RegNo, 1732 uint64_t Address, 1733 const void *Decoder) { 1734 if (RegNo > 31) 1735 return MCDisassembler::Fail; 1736 1737 unsigned Reg = getReg(Decoder, Mips::MSA128HRegClassID, RegNo); 1738 Inst.addOperand(MCOperand::createReg(Reg)); 1739 return MCDisassembler::Success; 1740 } 1741 1742 static DecodeStatus DecodeMSA128WRegisterClass(MCInst &Inst, 1743 unsigned RegNo, 1744 uint64_t Address, 1745 const void *Decoder) { 1746 if (RegNo > 31) 1747 return MCDisassembler::Fail; 1748 1749 unsigned Reg = getReg(Decoder, Mips::MSA128WRegClassID, RegNo); 1750 Inst.addOperand(MCOperand::createReg(Reg)); 1751 return MCDisassembler::Success; 1752 } 1753 1754 static DecodeStatus DecodeMSA128DRegisterClass(MCInst &Inst, 1755 unsigned RegNo, 1756 uint64_t Address, 1757 const void *Decoder) { 1758 if (RegNo > 31) 1759 return MCDisassembler::Fail; 1760 1761 unsigned Reg = getReg(Decoder, Mips::MSA128DRegClassID, RegNo); 1762 Inst.addOperand(MCOperand::createReg(Reg)); 1763 return MCDisassembler::Success; 1764 } 1765 1766 static DecodeStatus DecodeMSACtrlRegisterClass(MCInst &Inst, 1767 unsigned RegNo, 1768 uint64_t Address, 1769 const void *Decoder) { 1770 if (RegNo > 7) 1771 return MCDisassembler::Fail; 1772 1773 unsigned Reg = getReg(Decoder, Mips::MSACtrlRegClassID, RegNo); 1774 Inst.addOperand(MCOperand::createReg(Reg)); 1775 return MCDisassembler::Success; 1776 } 1777 1778 static DecodeStatus DecodeCOP0RegisterClass(MCInst &Inst, 1779 unsigned RegNo, 1780 uint64_t Address, 1781 const void *Decoder) { 1782 if (RegNo > 31) 1783 return MCDisassembler::Fail; 1784 1785 unsigned Reg = getReg(Decoder, Mips::COP0RegClassID, RegNo); 1786 Inst.addOperand(MCOperand::createReg(Reg)); 1787 return MCDisassembler::Success; 1788 } 1789 1790 static DecodeStatus DecodeCOP2RegisterClass(MCInst &Inst, 1791 unsigned RegNo, 1792 uint64_t Address, 1793 const void *Decoder) { 1794 if (RegNo > 31) 1795 return MCDisassembler::Fail; 1796 1797 unsigned Reg = getReg(Decoder, Mips::COP2RegClassID, RegNo); 1798 Inst.addOperand(MCOperand::createReg(Reg)); 1799 return MCDisassembler::Success; 1800 } 1801 1802 static DecodeStatus DecodeBranchTarget(MCInst &Inst, 1803 unsigned Offset, 1804 uint64_t Address, 1805 const void *Decoder) { 1806 int32_t BranchOffset = (SignExtend32<16>(Offset) * 4) + 4; 1807 Inst.addOperand(MCOperand::createImm(BranchOffset)); 1808 return MCDisassembler::Success; 1809 } 1810 1811 static DecodeStatus DecodeJumpTarget(MCInst &Inst, 1812 unsigned Insn, 1813 uint64_t Address, 1814 const void *Decoder) { 1815 1816 unsigned JumpOffset = fieldFromInstruction(Insn, 0, 26) << 2; 1817 Inst.addOperand(MCOperand::createImm(JumpOffset)); 1818 return MCDisassembler::Success; 1819 } 1820 1821 static DecodeStatus DecodeBranchTarget21(MCInst &Inst, 1822 unsigned Offset, 1823 uint64_t Address, 1824 const void *Decoder) { 1825 int32_t BranchOffset = SignExtend32<21>(Offset) * 4; 1826 1827 Inst.addOperand(MCOperand::createImm(BranchOffset)); 1828 return MCDisassembler::Success; 1829 } 1830 1831 static DecodeStatus DecodeBranchTarget26(MCInst &Inst, 1832 unsigned Offset, 1833 uint64_t Address, 1834 const void *Decoder) { 1835 int32_t BranchOffset = SignExtend32<26>(Offset) * 4; 1836 1837 Inst.addOperand(MCOperand::createImm(BranchOffset)); 1838 return MCDisassembler::Success; 1839 } 1840 1841 static DecodeStatus DecodeBranchTarget7MM(MCInst &Inst, 1842 unsigned Offset, 1843 uint64_t Address, 1844 const void *Decoder) { 1845 int32_t BranchOffset = SignExtend32<7>(Offset) << 1; 1846 Inst.addOperand(MCOperand::createImm(BranchOffset)); 1847 return MCDisassembler::Success; 1848 } 1849 1850 static DecodeStatus DecodeBranchTarget10MM(MCInst &Inst, 1851 unsigned Offset, 1852 uint64_t Address, 1853 const void *Decoder) { 1854 int32_t BranchOffset = SignExtend32<10>(Offset) << 1; 1855 Inst.addOperand(MCOperand::createImm(BranchOffset)); 1856 return MCDisassembler::Success; 1857 } 1858 1859 static DecodeStatus DecodeBranchTargetMM(MCInst &Inst, 1860 unsigned Offset, 1861 uint64_t Address, 1862 const void *Decoder) { 1863 int32_t BranchOffset = SignExtend32<16>(Offset) * 2; 1864 Inst.addOperand(MCOperand::createImm(BranchOffset)); 1865 return MCDisassembler::Success; 1866 } 1867 1868 static DecodeStatus DecodeBranchTarget26MM(MCInst &Inst, 1869 unsigned Offset, 1870 uint64_t Address, 1871 const void *Decoder) { 1872 int32_t BranchOffset = SignExtend32<26>(Offset) << 1; 1873 1874 Inst.addOperand(MCOperand::createImm(BranchOffset)); 1875 return MCDisassembler::Success; 1876 } 1877 1878 static DecodeStatus DecodeJumpTargetMM(MCInst &Inst, 1879 unsigned Insn, 1880 uint64_t Address, 1881 const void *Decoder) { 1882 unsigned JumpOffset = fieldFromInstruction(Insn, 0, 26) << 1; 1883 Inst.addOperand(MCOperand::createImm(JumpOffset)); 1884 return MCDisassembler::Success; 1885 } 1886 1887 static DecodeStatus DecodeAddiur2Simm7(MCInst &Inst, 1888 unsigned Value, 1889 uint64_t Address, 1890 const void *Decoder) { 1891 if (Value == 0) 1892 Inst.addOperand(MCOperand::createImm(1)); 1893 else if (Value == 0x7) 1894 Inst.addOperand(MCOperand::createImm(-1)); 1895 else 1896 Inst.addOperand(MCOperand::createImm(Value << 2)); 1897 return MCDisassembler::Success; 1898 } 1899 1900 static DecodeStatus DecodeUImm6Lsl2(MCInst &Inst, 1901 unsigned Value, 1902 uint64_t Address, 1903 const void *Decoder) { 1904 Inst.addOperand(MCOperand::createImm(Value << 2)); 1905 return MCDisassembler::Success; 1906 } 1907 1908 static DecodeStatus DecodeLiSimm7(MCInst &Inst, 1909 unsigned Value, 1910 uint64_t Address, 1911 const void *Decoder) { 1912 if (Value == 0x7F) 1913 Inst.addOperand(MCOperand::createImm(-1)); 1914 else 1915 Inst.addOperand(MCOperand::createImm(Value)); 1916 return MCDisassembler::Success; 1917 } 1918 1919 static DecodeStatus DecodePOOL16BEncodedField(MCInst &Inst, 1920 unsigned Value, 1921 uint64_t Address, 1922 const void *Decoder) { 1923 Inst.addOperand(MCOperand::createImm(Value == 0x0 ? 8 : Value)); 1924 return MCDisassembler::Success; 1925 } 1926 1927 static DecodeStatus DecodeSimm4(MCInst &Inst, 1928 unsigned Value, 1929 uint64_t Address, 1930 const void *Decoder) { 1931 Inst.addOperand(MCOperand::createImm(SignExtend32<4>(Value))); 1932 return MCDisassembler::Success; 1933 } 1934 1935 static DecodeStatus DecodeSimm16(MCInst &Inst, 1936 unsigned Insn, 1937 uint64_t Address, 1938 const void *Decoder) { 1939 Inst.addOperand(MCOperand::createImm(SignExtend32<16>(Insn))); 1940 return MCDisassembler::Success; 1941 } 1942 1943 template <unsigned Bits, int Offset> 1944 static DecodeStatus DecodeUImmWithOffset(MCInst &Inst, unsigned Value, 1945 uint64_t Address, 1946 const void *Decoder) { 1947 Value &= ((1 << Bits) - 1); 1948 Inst.addOperand(MCOperand::createImm(Value + Offset)); 1949 return MCDisassembler::Success; 1950 } 1951 1952 static DecodeStatus DecodeInsSize(MCInst &Inst, 1953 unsigned Insn, 1954 uint64_t Address, 1955 const void *Decoder) { 1956 // First we need to grab the pos(lsb) from MCInst. 1957 int Pos = Inst.getOperand(2).getImm(); 1958 int Size = (int) Insn - Pos + 1; 1959 Inst.addOperand(MCOperand::createImm(SignExtend32<16>(Size))); 1960 return MCDisassembler::Success; 1961 } 1962 1963 static DecodeStatus DecodeSimm19Lsl2(MCInst &Inst, unsigned Insn, 1964 uint64_t Address, const void *Decoder) { 1965 Inst.addOperand(MCOperand::createImm(SignExtend32<19>(Insn) * 4)); 1966 return MCDisassembler::Success; 1967 } 1968 1969 static DecodeStatus DecodeSimm18Lsl3(MCInst &Inst, unsigned Insn, 1970 uint64_t Address, const void *Decoder) { 1971 Inst.addOperand(MCOperand::createImm(SignExtend32<18>(Insn) * 8)); 1972 return MCDisassembler::Success; 1973 } 1974 1975 static DecodeStatus DecodeSimm9SP(MCInst &Inst, unsigned Insn, 1976 uint64_t Address, const void *Decoder) { 1977 int32_t DecodedValue; 1978 switch (Insn) { 1979 case 0: DecodedValue = 256; break; 1980 case 1: DecodedValue = 257; break; 1981 case 510: DecodedValue = -258; break; 1982 case 511: DecodedValue = -257; break; 1983 default: DecodedValue = SignExtend32<9>(Insn); break; 1984 } 1985 Inst.addOperand(MCOperand::createImm(DecodedValue * 4)); 1986 return MCDisassembler::Success; 1987 } 1988 1989 static DecodeStatus DecodeANDI16Imm(MCInst &Inst, unsigned Insn, 1990 uint64_t Address, const void *Decoder) { 1991 // Insn must be >= 0, since it is unsigned that condition is always true. 1992 assert(Insn < 16); 1993 int32_t DecodedValues[] = {128, 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 1994 255, 32768, 65535}; 1995 Inst.addOperand(MCOperand::createImm(DecodedValues[Insn])); 1996 return MCDisassembler::Success; 1997 } 1998 1999 static DecodeStatus DecodeUImm5lsl2(MCInst &Inst, unsigned Insn, 2000 uint64_t Address, const void *Decoder) { 2001 Inst.addOperand(MCOperand::createImm(Insn << 2)); 2002 return MCDisassembler::Success; 2003 } 2004 2005 static DecodeStatus DecodeRegListOperand(MCInst &Inst, 2006 unsigned Insn, 2007 uint64_t Address, 2008 const void *Decoder) { 2009 unsigned Regs[] = {Mips::S0, Mips::S1, Mips::S2, Mips::S3, Mips::S4, Mips::S5, 2010 Mips::S6, Mips::S7, Mips::FP}; 2011 unsigned RegNum; 2012 2013 unsigned RegLst = fieldFromInstruction(Insn, 21, 5); 2014 2015 // Empty register lists are not allowed. 2016 if (RegLst == 0) 2017 return MCDisassembler::Fail; 2018 2019 RegNum = RegLst & 0xf; 2020 2021 // RegLst values 10-15, and 26-31 are reserved. 2022 if (RegNum > 9) 2023 return MCDisassembler::Fail; 2024 2025 for (unsigned i = 0; i < RegNum; i++) 2026 Inst.addOperand(MCOperand::createReg(Regs[i])); 2027 2028 if (RegLst & 0x10) 2029 Inst.addOperand(MCOperand::createReg(Mips::RA)); 2030 2031 return MCDisassembler::Success; 2032 } 2033 2034 static DecodeStatus DecodeRegListOperand16(MCInst &Inst, unsigned Insn, 2035 uint64_t Address, 2036 const void *Decoder) { 2037 unsigned Regs[] = {Mips::S0, Mips::S1, Mips::S2, Mips::S3}; 2038 unsigned RegLst; 2039 switch(Inst.getOpcode()) { 2040 default: 2041 RegLst = fieldFromInstruction(Insn, 4, 2); 2042 break; 2043 case Mips::LWM16_MMR6: 2044 case Mips::SWM16_MMR6: 2045 RegLst = fieldFromInstruction(Insn, 8, 2); 2046 break; 2047 } 2048 unsigned RegNum = RegLst & 0x3; 2049 2050 for (unsigned i = 0; i <= RegNum; i++) 2051 Inst.addOperand(MCOperand::createReg(Regs[i])); 2052 2053 Inst.addOperand(MCOperand::createReg(Mips::RA)); 2054 2055 return MCDisassembler::Success; 2056 } 2057 2058 static DecodeStatus DecodeMovePRegPair(MCInst &Inst, unsigned Insn, 2059 uint64_t Address, const void *Decoder) { 2060 2061 unsigned RegPair = fieldFromInstruction(Insn, 7, 3); 2062 2063 switch (RegPair) { 2064 default: 2065 return MCDisassembler::Fail; 2066 case 0: 2067 Inst.addOperand(MCOperand::createReg(Mips::A1)); 2068 Inst.addOperand(MCOperand::createReg(Mips::A2)); 2069 break; 2070 case 1: 2071 Inst.addOperand(MCOperand::createReg(Mips::A1)); 2072 Inst.addOperand(MCOperand::createReg(Mips::A3)); 2073 break; 2074 case 2: 2075 Inst.addOperand(MCOperand::createReg(Mips::A2)); 2076 Inst.addOperand(MCOperand::createReg(Mips::A3)); 2077 break; 2078 case 3: 2079 Inst.addOperand(MCOperand::createReg(Mips::A0)); 2080 Inst.addOperand(MCOperand::createReg(Mips::S5)); 2081 break; 2082 case 4: 2083 Inst.addOperand(MCOperand::createReg(Mips::A0)); 2084 Inst.addOperand(MCOperand::createReg(Mips::S6)); 2085 break; 2086 case 5: 2087 Inst.addOperand(MCOperand::createReg(Mips::A0)); 2088 Inst.addOperand(MCOperand::createReg(Mips::A1)); 2089 break; 2090 case 6: 2091 Inst.addOperand(MCOperand::createReg(Mips::A0)); 2092 Inst.addOperand(MCOperand::createReg(Mips::A2)); 2093 break; 2094 case 7: 2095 Inst.addOperand(MCOperand::createReg(Mips::A0)); 2096 Inst.addOperand(MCOperand::createReg(Mips::A3)); 2097 break; 2098 } 2099 2100 return MCDisassembler::Success; 2101 } 2102 2103 static DecodeStatus DecodeSimm23Lsl2(MCInst &Inst, unsigned Insn, 2104 uint64_t Address, const void *Decoder) { 2105 Inst.addOperand(MCOperand::createImm(SignExtend32<25>(Insn << 2))); 2106 return MCDisassembler::Success; 2107 } 2108
