lib/Target/XCore/Disassembler/XCoreDisassembler.cpp

   1 //===- XCoreDisassembler.cpp - Disassembler for XCore -----------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 ///
   9 /// \file
  10 /// This file is part of the XCore Disassembler.
  11 ///
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "TargetInfo/XCoreTargetInfo.h"
  15 #include "XCore.h"
  16 #include "XCoreRegisterInfo.h"
  17 #include "llvm/MC/MCContext.h"
  18 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
  19 #include "llvm/MC/MCFixedLenDisassembler.h"
  20 #include "llvm/MC/MCInst.h"
  21 #include "llvm/MC/MCSubtargetInfo.h"
  22 #include "llvm/Support/TargetRegistry.h"
  23
  24 using namespace llvm;
  25
  26 #define DEBUG_TYPE "xcore-disassembler"
  27
  28 typedef MCDisassembler::DecodeStatus DecodeStatus;
  29
  30 namespace {
  31
  32 /// A disassembler class for XCore.
  33 class XCoreDisassembler : public MCDisassembler {
  34 public:
  35   XCoreDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx) :
  36     MCDisassembler(STI, Ctx) {}
  37
  38   DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
  39                               ArrayRef<uint8_t> Bytes, uint64_t Address,
  40                               raw_ostream &VStream,
  41                               raw_ostream &CStream) const override;
  42 };
  43 }
  44
  45 static bool readInstruction16(ArrayRef<uint8_t> Bytes, uint64_t Address,
  46                               uint64_t &Size, uint16_t &Insn) {
  47   // We want to read exactly 2 Bytes of data.
  48   if (Bytes.size() < 2) {
  49     Size = 0;
  50     return false;
  51   }
  52   // Encoded as a little-endian 16-bit word in the stream.
  53   Insn = (Bytes[0] << 0) | (Bytes[1] << 8);
  54   return true;
  55 }
  56
  57 static bool readInstruction32(ArrayRef<uint8_t> Bytes, uint64_t Address,
  58                               uint64_t &Size, uint32_t &Insn) {
  59   // We want to read exactly 4 Bytes of data.
  60   if (Bytes.size() < 4) {
  61     Size = 0;
  62     return false;
  63   }
  64   // Encoded as a little-endian 32-bit word in the stream.
  65   Insn =
  66       (Bytes[0] << 0) | (Bytes[1] << 8) | (Bytes[2] << 16) | (Bytes[3] << 24);
  67   return true;
  68 }
  69
  70 static unsigned getReg(const void *D, unsigned RC, unsigned RegNo) {
  71   const XCoreDisassembler *Dis = static_cast<const XCoreDisassembler*>(D);
  72   const MCRegisterInfo *RegInfo = Dis->getContext().getRegisterInfo();
  73   return *(RegInfo->getRegClass(RC).begin() + RegNo);
  74 }
  75
  76 static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst,
  77                                               unsigned RegNo,
  78                                               uint64_t Address,
  79                                               const void *Decoder);
  80
  81 static DecodeStatus DecodeRRegsRegisterClass(MCInst &Inst,
  82                                              unsigned RegNo,
  83                                              uint64_t Address,
  84                                              const void *Decoder);
  85
  86 static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val,
  87                                       uint64_t Address, const void *Decoder);
  88
  89 static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val,
  90                                         uint64_t Address, const void *Decoder);
  91
  92 static DecodeStatus Decode2RInstruction(MCInst &Inst,
  93                                         unsigned Insn,
  94                                         uint64_t Address,
  95                                         const void *Decoder);
  96
  97 static DecodeStatus Decode2RImmInstruction(MCInst &Inst,
  98                                            unsigned Insn,
  99                                            uint64_t Address,
 100                                            const void *Decoder);
 101
 102 static DecodeStatus DecodeR2RInstruction(MCInst &Inst,
 103                                          unsigned Insn,
 104                                          uint64_t Address,
 105                                          const void *Decoder);
 106
 107 static DecodeStatus Decode2RSrcDstInstruction(MCInst &Inst,
 108                                               unsigned Insn,
 109                                               uint64_t Address,
 110                                               const void *Decoder);
 111
 112 static DecodeStatus DecodeRUSInstruction(MCInst &Inst,
 113                                          unsigned Insn,
 114                                          uint64_t Address,
 115                                          const void *Decoder);
 116
 117 static DecodeStatus DecodeRUSBitpInstruction(MCInst &Inst,
 118                                              unsigned Insn,
 119                                              uint64_t Address,
 120                                              const void *Decoder);
 121
 122 static DecodeStatus DecodeRUSSrcDstBitpInstruction(MCInst &Inst,
 123                                                    unsigned Insn,
 124                                                    uint64_t Address,
 125                                                    const void *Decoder);
 126
 127 static DecodeStatus DecodeL2RInstruction(MCInst &Inst,
 128                                          unsigned Insn,
 129                                          uint64_t Address,
 130                                          const void *Decoder);
 131
 132 static DecodeStatus DecodeLR2RInstruction(MCInst &Inst,
 133                                           unsigned Insn,
 134                                           uint64_t Address,
 135                                           const void *Decoder);
 136
 137 static DecodeStatus Decode3RInstruction(MCInst &Inst,
 138                                         unsigned Insn,
 139                                         uint64_t Address,
 140                                         const void *Decoder);
 141
 142 static DecodeStatus Decode3RImmInstruction(MCInst &Inst,
 143                                            unsigned Insn,
 144                                            uint64_t Address,
 145                                            const void *Decoder);
 146
 147 static DecodeStatus Decode2RUSInstruction(MCInst &Inst,
 148                                           unsigned Insn,
 149                                           uint64_t Address,
 150                                           const void *Decoder);
 151
 152 static DecodeStatus Decode2RUSBitpInstruction(MCInst &Inst,
 153                                               unsigned Insn,
 154                                               uint64_t Address,
 155                                               const void *Decoder);
 156
 157 static DecodeStatus DecodeL3RInstruction(MCInst &Inst,
 158                                          unsigned Insn,
 159                                          uint64_t Address,
 160                                          const void *Decoder);
 161
 162 static DecodeStatus DecodeL3RSrcDstInstruction(MCInst &Inst,
 163                                                unsigned Insn,
 164                                                uint64_t Address,
 165                                                const void *Decoder);
 166
 167 static DecodeStatus DecodeL2RUSInstruction(MCInst &Inst,
 168                                            unsigned Insn,
 169                                            uint64_t Address,
 170                                            const void *Decoder);
 171
 172 static DecodeStatus DecodeL2RUSBitpInstruction(MCInst &Inst,
 173                                                unsigned Insn,
 174                                                uint64_t Address,
 175                                                const void *Decoder);
 176
 177 static DecodeStatus DecodeL6RInstruction(MCInst &Inst,
 178                                          unsigned Insn,
 179                                          uint64_t Address,
 180                                          const void *Decoder);
 181
 182 static DecodeStatus DecodeL5RInstruction(MCInst &Inst,
 183                                          unsigned Insn,
 184                                          uint64_t Address,
 185                                          const void *Decoder);
 186
 187 static DecodeStatus DecodeL4RSrcDstInstruction(MCInst &Inst,
 188                                                unsigned Insn,
 189                                                uint64_t Address,
 190                                                const void *Decoder);
 191
 192 static DecodeStatus DecodeL4RSrcDstSrcDstInstruction(MCInst &Inst,
 193                                                      unsigned Insn,
 194                                                      uint64_t Address,
 195                                                      const void *Decoder);
 196
 197 #include "XCoreGenDisassemblerTables.inc"
 198
 199 static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst,
 200                                               unsigned RegNo,
 201                                               uint64_t Address,
 202                                               const void *Decoder)
 203 {
 204   if (RegNo > 11)
 205     return MCDisassembler::Fail;
 206   unsigned Reg = getReg(Decoder, XCore::GRRegsRegClassID, RegNo);
 207   Inst.addOperand(MCOperand::createReg(Reg));
 208   return MCDisassembler::Success;
 209 }
 210
 211 static DecodeStatus DecodeRRegsRegisterClass(MCInst &Inst,
 212                                              unsigned RegNo,
 213                                              uint64_t Address,
 214                                              const void *Decoder)
 215 {
 216   if (RegNo > 15)
 217     return MCDisassembler::Fail;
 218   unsigned Reg = getReg(Decoder, XCore::RRegsRegClassID, RegNo);
 219   Inst.addOperand(MCOperand::createReg(Reg));
 220   return MCDisassembler::Success;
 221 }
 222
 223 static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val,
 224                                       uint64_t Address, const void *Decoder) {
 225   if (Val > 11)
 226     return MCDisassembler::Fail;
 227   static const unsigned Values[] = {
 228     32 /*bpw*/, 1, 2, 3, 4, 5, 6, 7, 8, 16, 24, 32
 229   };
 230   Inst.addOperand(MCOperand::createImm(Values[Val]));
 231   return MCDisassembler::Success;
 232 }
 233
 234 static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val,
 235                                         uint64_t Address, const void *Decoder) {
 236   Inst.addOperand(MCOperand::createImm(-(int64_t)Val));
 237   return MCDisassembler::Success;
 238 }
 239
 240 static DecodeStatus
 241 Decode2OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2) {
 242   unsigned Combined = fieldFromInstruction(Insn, 6, 5);
 243   if (Combined < 27)
 244     return MCDisassembler::Fail;
 245   if (fieldFromInstruction(Insn, 5, 1)) {
 246     if (Combined == 31)
 247       return MCDisassembler::Fail;
 248     Combined += 5;
 249   }
 250   Combined -= 27;
 251   unsigned Op1High = Combined % 3;
 252   unsigned Op2High = Combined / 3;
 253   Op1 = (Op1High << 2) | fieldFromInstruction(Insn, 2, 2);
 254   Op2 = (Op2High << 2) | fieldFromInstruction(Insn, 0, 2);
 255   return MCDisassembler::Success;
 256 }
 257
 258 static DecodeStatus
 259 Decode3OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2,
 260                      unsigned &Op3) {
 261   unsigned Combined = fieldFromInstruction(Insn, 6, 5);
 262   if (Combined >= 27)
 263     return MCDisassembler::Fail;
 264
 265   unsigned Op1High = Combined % 3;
 266   unsigned Op2High = (Combined / 3) % 3;
 267   unsigned Op3High = Combined / 9;
 268   Op1 = (Op1High << 2) | fieldFromInstruction(Insn, 4, 2);
 269   Op2 = (Op2High << 2) | fieldFromInstruction(Insn, 2, 2);
 270   Op3 = (Op3High << 2) | fieldFromInstruction(Insn, 0, 2);
 271   return MCDisassembler::Success;
 272 }
 273
 274 static DecodeStatus
 275 Decode2OpInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address,
 276                          const void *Decoder) {
 277   // Try and decode as a 3R instruction.
 278   unsigned Opcode = fieldFromInstruction(Insn, 11, 5);
 279   switch (Opcode) {
 280   case 0x0:
 281     Inst.setOpcode(XCore::STW_2rus);
 282     return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
 283   case 0x1:
 284     Inst.setOpcode(XCore::LDW_2rus);
 285     return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
 286   case 0x2:
 287     Inst.setOpcode(XCore::ADD_3r);
 288     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 289   case 0x3:
 290     Inst.setOpcode(XCore::SUB_3r);
 291     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 292   case 0x4:
 293     Inst.setOpcode(XCore::SHL_3r);
 294     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 295   case 0x5:
 296     Inst.setOpcode(XCore::SHR_3r);
 297     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 298   case 0x6:
 299     Inst.setOpcode(XCore::EQ_3r);
 300     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 301   case 0x7:
 302     Inst.setOpcode(XCore::AND_3r);
 303     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 304   case 0x8:
 305     Inst.setOpcode(XCore::OR_3r);
 306     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 307   case 0x9:
 308     Inst.setOpcode(XCore::LDW_3r);
 309     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 310   case 0x10:
 311     Inst.setOpcode(XCore::LD16S_3r);
 312     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 313   case 0x11:
 314     Inst.setOpcode(XCore::LD8U_3r);
 315     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 316   case 0x12:
 317     Inst.setOpcode(XCore::ADD_2rus);
 318     return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
 319   case 0x13:
 320     Inst.setOpcode(XCore::SUB_2rus);
 321     return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
 322   case 0x14:
 323     Inst.setOpcode(XCore::SHL_2rus);
 324     return Decode2RUSBitpInstruction(Inst, Insn, Address, Decoder);
 325   case 0x15:
 326     Inst.setOpcode(XCore::SHR_2rus);
 327     return Decode2RUSBitpInstruction(Inst, Insn, Address, Decoder);
 328   case 0x16:
 329     Inst.setOpcode(XCore::EQ_2rus);
 330     return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
 331   case 0x17:
 332     Inst.setOpcode(XCore::TSETR_3r);
 333     return Decode3RImmInstruction(Inst, Insn, Address, Decoder);
 334   case 0x18:
 335     Inst.setOpcode(XCore::LSS_3r);
 336     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 337   case 0x19:
 338     Inst.setOpcode(XCore::LSU_3r);
 339     return Decode3RInstruction(Inst, Insn, Address, Decoder);
 340   }
 341   return MCDisassembler::Fail;
 342 }
 343
 344 static DecodeStatus
 345 Decode2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 346                     const void *Decoder) {
 347   unsigned Op1, Op2;
 348   DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
 349   if (S != MCDisassembler::Success)
 350     return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
 351
 352   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 353   DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 354   return S;
 355 }
 356
 357 static DecodeStatus
 358 Decode2RImmInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 359                        const void *Decoder) {
 360   unsigned Op1, Op2;
 361   DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
 362   if (S != MCDisassembler::Success)
 363     return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
 364
 365   Inst.addOperand(MCOperand::createImm(Op1));
 366   DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 367   return S;
 368 }
 369
 370 static DecodeStatus
 371 DecodeR2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 372                      const void *Decoder) {
 373   unsigned Op1, Op2;
 374   DecodeStatus S = Decode2OpInstruction(Insn, Op2, Op1);
 375   if (S != MCDisassembler::Success)
 376     return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
 377
 378   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 379   DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 380   return S;
 381 }
 382
 383 static DecodeStatus
 384 Decode2RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 385                           const void *Decoder) {
 386   unsigned Op1, Op2;
 387   DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
 388   if (S != MCDisassembler::Success)
 389     return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
 390
 391   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 392   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 393   DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 394   return S;
 395 }
 396
 397 static DecodeStatus
 398 DecodeRUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 399                      const void *Decoder) {
 400   unsigned Op1, Op2;
 401   DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
 402   if (S != MCDisassembler::Success)
 403     return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
 404
 405   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 406   Inst.addOperand(MCOperand::createImm(Op2));
 407   return S;
 408 }
 409
 410 static DecodeStatus
 411 DecodeRUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 412                          const void *Decoder) {
 413   unsigned Op1, Op2;
 414   DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
 415   if (S != MCDisassembler::Success)
 416     return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
 417
 418   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 419   DecodeBitpOperand(Inst, Op2, Address, Decoder);
 420   return S;
 421 }
 422
 423 static DecodeStatus
 424 DecodeRUSSrcDstBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 425                                const void *Decoder) {
 426   unsigned Op1, Op2;
 427   DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
 428   if (S != MCDisassembler::Success)
 429     return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
 430
 431   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 432   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 433   DecodeBitpOperand(Inst, Op2, Address, Decoder);
 434   return S;
 435 }
 436
 437 static DecodeStatus
 438 DecodeL2OpInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address,
 439                           const void *Decoder) {
 440   // Try and decode as a L3R / L2RUS instruction.
 441   unsigned Opcode = fieldFromInstruction(Insn, 16, 4) |
 442                     fieldFromInstruction(Insn, 27, 5) << 4;
 443   switch (Opcode) {
 444   case 0x0c:
 445     Inst.setOpcode(XCore::STW_l3r);
 446     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 447   case 0x1c:
 448     Inst.setOpcode(XCore::XOR_l3r);
 449     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 450   case 0x2c:
 451     Inst.setOpcode(XCore::ASHR_l3r);
 452     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 453   case 0x3c:
 454     Inst.setOpcode(XCore::LDAWF_l3r);
 455     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 456   case 0x4c:
 457     Inst.setOpcode(XCore::LDAWB_l3r);
 458     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 459   case 0x5c:
 460     Inst.setOpcode(XCore::LDA16F_l3r);
 461     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 462   case 0x6c:
 463     Inst.setOpcode(XCore::LDA16B_l3r);
 464     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 465   case 0x7c:
 466     Inst.setOpcode(XCore::MUL_l3r);
 467     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 468   case 0x8c:
 469     Inst.setOpcode(XCore::DIVS_l3r);
 470     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 471   case 0x9c:
 472     Inst.setOpcode(XCore::DIVU_l3r);
 473     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 474   case 0x10c:
 475     Inst.setOpcode(XCore::ST16_l3r);
 476     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 477   case 0x11c:
 478     Inst.setOpcode(XCore::ST8_l3r);
 479     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 480   case 0x12c:
 481     Inst.setOpcode(XCore::ASHR_l2rus);
 482     return DecodeL2RUSBitpInstruction(Inst, Insn, Address, Decoder);
 483   case 0x12d:
 484     Inst.setOpcode(XCore::OUTPW_l2rus);
 485     return DecodeL2RUSBitpInstruction(Inst, Insn, Address, Decoder);
 486   case 0x12e:
 487     Inst.setOpcode(XCore::INPW_l2rus);
 488     return DecodeL2RUSBitpInstruction(Inst, Insn, Address, Decoder);
 489   case 0x13c:
 490     Inst.setOpcode(XCore::LDAWF_l2rus);
 491     return DecodeL2RUSInstruction(Inst, Insn, Address, Decoder);
 492   case 0x14c:
 493     Inst.setOpcode(XCore::LDAWB_l2rus);
 494     return DecodeL2RUSInstruction(Inst, Insn, Address, Decoder);
 495   case 0x15c:
 496     Inst.setOpcode(XCore::CRC_l3r);
 497     return DecodeL3RSrcDstInstruction(Inst, Insn, Address, Decoder);
 498   case 0x18c:
 499     Inst.setOpcode(XCore::REMS_l3r);
 500     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 501   case 0x19c:
 502     Inst.setOpcode(XCore::REMU_l3r);
 503     return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
 504   }
 505   return MCDisassembler::Fail;
 506 }
 507
 508 static DecodeStatus
 509 DecodeL2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 510                                const void *Decoder) {
 511   unsigned Op1, Op2;
 512   DecodeStatus S = Decode2OpInstruction(fieldFromInstruction(Insn, 0, 16),
 513                                         Op1, Op2);
 514   if (S != MCDisassembler::Success)
 515     return DecodeL2OpInstructionFail(Inst, Insn, Address, Decoder);
 516
 517   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 518   DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 519   return S;
 520 }
 521
 522 static DecodeStatus
 523 DecodeLR2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 524                                const void *Decoder) {
 525   unsigned Op1, Op2;
 526   DecodeStatus S = Decode2OpInstruction(fieldFromInstruction(Insn, 0, 16),
 527                                         Op1, Op2);
 528   if (S != MCDisassembler::Success)
 529     return DecodeL2OpInstructionFail(Inst, Insn, Address, Decoder);
 530
 531   DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 532   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 533   return S;
 534 }
 535
 536 static DecodeStatus
 537 Decode3RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 538                     const void *Decoder) {
 539   unsigned Op1, Op2, Op3;
 540   DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
 541   if (S == MCDisassembler::Success) {
 542     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 543     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 544     DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
 545   }
 546   return S;
 547 }
 548
 549 static DecodeStatus
 550 Decode3RImmInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 551                        const void *Decoder) {
 552   unsigned Op1, Op2, Op3;
 553   DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
 554   if (S == MCDisassembler::Success) {
 555     Inst.addOperand(MCOperand::createImm(Op1));
 556     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 557     DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
 558   }
 559   return S;
 560 }
 561
 562 static DecodeStatus
 563 Decode2RUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 564                       const void *Decoder) {
 565   unsigned Op1, Op2, Op3;
 566   DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
 567   if (S == MCDisassembler::Success) {
 568     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 569     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 570     Inst.addOperand(MCOperand::createImm(Op3));
 571   }
 572   return S;
 573 }
 574
 575 static DecodeStatus
 576 Decode2RUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 577                       const void *Decoder) {
 578   unsigned Op1, Op2, Op3;
 579   DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
 580   if (S == MCDisassembler::Success) {
 581     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 582     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 583     DecodeBitpOperand(Inst, Op3, Address, Decoder);
 584   }
 585   return S;
 586 }
 587
 588 static DecodeStatus
 589 DecodeL3RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 590                      const void *Decoder) {
 591   unsigned Op1, Op2, Op3;
 592   DecodeStatus S =
 593     Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
 594   if (S == MCDisassembler::Success) {
 595     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 596     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 597     DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
 598   }
 599   return S;
 600 }
 601
 602 static DecodeStatus
 603 DecodeL3RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 604                            const void *Decoder) {
 605   unsigned Op1, Op2, Op3;
 606   DecodeStatus S =
 607   Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
 608   if (S == MCDisassembler::Success) {
 609     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 610     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 611     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 612     DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
 613   }
 614   return S;
 615 }
 616
 617 static DecodeStatus
 618 DecodeL2RUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 619                        const void *Decoder) {
 620   unsigned Op1, Op2, Op3;
 621   DecodeStatus S =
 622   Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
 623   if (S == MCDisassembler::Success) {
 624     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 625     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 626     Inst.addOperand(MCOperand::createImm(Op3));
 627   }
 628   return S;
 629 }
 630
 631 static DecodeStatus
 632 DecodeL2RUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 633                            const void *Decoder) {
 634   unsigned Op1, Op2, Op3;
 635   DecodeStatus S =
 636   Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
 637   if (S == MCDisassembler::Success) {
 638     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 639     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 640     DecodeBitpOperand(Inst, Op3, Address, Decoder);
 641   }
 642   return S;
 643 }
 644
 645 static DecodeStatus
 646 DecodeL6RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 647                      const void *Decoder) {
 648   unsigned Op1, Op2, Op3, Op4, Op5, Op6;
 649   DecodeStatus S =
 650     Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
 651   if (S != MCDisassembler::Success)
 652     return S;
 653   S = Decode3OpInstruction(fieldFromInstruction(Insn, 16, 16), Op4, Op5, Op6);
 654   if (S != MCDisassembler::Success)
 655     return S;
 656   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 657   DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
 658   DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 659   DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
 660   DecodeGRRegsRegisterClass(Inst, Op5, Address, Decoder);
 661   DecodeGRRegsRegisterClass(Inst, Op6, Address, Decoder);
 662   return S;
 663 }
 664
 665 static DecodeStatus
 666 DecodeL5RInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address,
 667                      const void *Decoder) {
 668   // Try and decode as a L6R instruction.
 669   Inst.clear();
 670   unsigned Opcode = fieldFromInstruction(Insn, 27, 5);
 671   switch (Opcode) {
 672   case 0x00:
 673     Inst.setOpcode(XCore::LMUL_l6r);
 674     return DecodeL6RInstruction(Inst, Insn, Address, Decoder);
 675   }
 676   return MCDisassembler::Fail;
 677 }
 678
 679 static DecodeStatus
 680 DecodeL5RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 681                      const void *Decoder) {
 682   unsigned Op1, Op2, Op3, Op4, Op5;
 683   DecodeStatus S =
 684     Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
 685   if (S != MCDisassembler::Success)
 686     return DecodeL5RInstructionFail(Inst, Insn, Address, Decoder);
 687   S = Decode2OpInstruction(fieldFromInstruction(Insn, 16, 16), Op4, Op5);
 688   if (S != MCDisassembler::Success)
 689     return DecodeL5RInstructionFail(Inst, Insn, Address, Decoder);
 690
 691   DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 692   DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
 693   DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 694   DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
 695   DecodeGRRegsRegisterClass(Inst, Op5, Address, Decoder);
 696   return S;
 697 }
 698
 699 static DecodeStatus
 700 DecodeL4RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 701                            const void *Decoder) {
 702   unsigned Op1, Op2, Op3;
 703   unsigned Op4 = fieldFromInstruction(Insn, 16, 4);
 704   DecodeStatus S =
 705     Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
 706   if (S == MCDisassembler::Success) {
 707     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 708     S = DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
 709   }
 710   if (S == MCDisassembler::Success) {
 711     DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
 712     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 713     DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
 714   }
 715   return S;
 716 }
 717
 718 static DecodeStatus
 719 DecodeL4RSrcDstSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
 720                                  const void *Decoder) {
 721   unsigned Op1, Op2, Op3;
 722   unsigned Op4 = fieldFromInstruction(Insn, 16, 4);
 723   DecodeStatus S =
 724   Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
 725   if (S == MCDisassembler::Success) {
 726     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 727     S = DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
 728   }
 729   if (S == MCDisassembler::Success) {
 730     DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
 731     DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
 732     DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
 733     DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
 734   }
 735   return S;
 736 }
 737
 738 MCDisassembler::DecodeStatus XCoreDisassembler::getInstruction(
 739     MCInst &instr, uint64_t &Size, ArrayRef<uint8_t> Bytes, uint64_t Address,
 740     raw_ostream &vStream, raw_ostream &cStream) const {
 741   uint16_t insn16;
 742
 743   if (!readInstruction16(Bytes, Address, Size, insn16)) {
 744     return Fail;
 745   }
 746
 747   // Calling the auto-generated decoder function.
 748   DecodeStatus Result = decodeInstruction(DecoderTable16, instr, insn16,
 749                                           Address, this, STI);
 750   if (Result != Fail) {
 751     Size = 2;
 752     return Result;
 753   }
 754
 755   uint32_t insn32;
 756
 757   if (!readInstruction32(Bytes, Address, Size, insn32)) {
 758     return Fail;
 759   }
 760
 761   // Calling the auto-generated decoder function.
 762   Result = decodeInstruction(DecoderTable32, instr, insn32, Address, this, STI);
 763   if (Result != Fail) {
 764     Size = 4;
 765     return Result;
 766   }
 767
 768   return Fail;
 769 }
 770
 771 static MCDisassembler *createXCoreDisassembler(const Target &T,
 772                                                const MCSubtargetInfo &STI,
 773                                                MCContext &Ctx) {
 774   return new XCoreDisassembler(STI, Ctx);
 775 }
 776
 777 extern "C" void LLVMInitializeXCoreDisassembler() {
 778   // Register the disassembler.
 779   TargetRegistry::RegisterMCDisassembler(getTheXCoreTarget(),
 780                                          createXCoreDisassembler);
 781 }