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      1 //===- MBlazeDisassembler.cpp - Disassembler for MicroBlaze  ----*- 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 MBlaze Disassembler. It contains code to translate
     11 // the data produced by the decoder into MCInsts.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #include "MBlaze.h"
     16 #include "MBlazeInstrInfo.h"
     17 #include "MBlazeDisassembler.h"
     18 
     19 #include "llvm/MC/EDInstInfo.h"
     20 #include "llvm/MC/MCDisassembler.h"
     21 #include "llvm/MC/MCDisassembler.h"
     22 #include "llvm/MC/MCInst.h"
     23 #include "llvm/Support/Debug.h"
     24 #include "llvm/Support/MemoryObject.h"
     25 #include "llvm/Support/TargetRegistry.h"
     26 #include "llvm/Support/raw_ostream.h"
     27 
     28 // #include "MBlazeGenDecoderTables.inc"
     29 // #include "MBlazeGenRegisterNames.inc"
     30 #include "MBlazeGenEDInfo.inc"
     31 
     32 namespace llvm {
     33 extern MCInstrDesc MBlazeInsts[];
     34 }
     35 
     36 using namespace llvm;
     37 
     38 const unsigned UNSUPPORTED = -1;
     39 
     40 static unsigned mblazeBinary2Opcode[] = {
     41   MBlaze::ADD,   MBlaze::RSUB,   MBlaze::ADDC,   MBlaze::RSUBC,   //00,01,02,03
     42   MBlaze::ADDK,  MBlaze::RSUBK,  MBlaze::ADDKC,  MBlaze::RSUBKC,  //04,05,06,07
     43   MBlaze::ADDI,  MBlaze::RSUBI,  MBlaze::ADDIC,  MBlaze::RSUBIC,  //08,09,0A,0B
     44   MBlaze::ADDIK, MBlaze::RSUBIK, MBlaze::ADDIKC, MBlaze::RSUBIKC, //0C,0D,0E,0F
     45 
     46   MBlaze::MUL,   MBlaze::BSRL,   MBlaze::IDIV,   MBlaze::GETD,    //10,11,12,13
     47   UNSUPPORTED,   UNSUPPORTED,    MBlaze::FADD,   UNSUPPORTED,     //14,15,16,17
     48   MBlaze::MULI,  MBlaze::BSRLI,  UNSUPPORTED,    MBlaze::GET,     //18,19,1A,1B
     49   UNSUPPORTED,   UNSUPPORTED,    UNSUPPORTED,    UNSUPPORTED,     //1C,1D,1E,1F
     50 
     51   MBlaze::OR,    MBlaze::AND,    MBlaze::XOR,    MBlaze::ANDN,    //20,21,22,23
     52   MBlaze::SEXT8, MBlaze::MFS,    MBlaze::BR,     MBlaze::BEQ,     //24,25,26,27
     53   MBlaze::ORI,   MBlaze::ANDI,   MBlaze::XORI,   MBlaze::ANDNI,   //28,29,2A,2B
     54   MBlaze::IMM,   MBlaze::RTSD,   MBlaze::BRI,    MBlaze::BEQI,    //2C,2D,2E,2F
     55 
     56   MBlaze::LBU,   MBlaze::LHU,    MBlaze::LW,     UNSUPPORTED,     //30,31,32,33
     57   MBlaze::SB,    MBlaze::SH,     MBlaze::SW,     UNSUPPORTED,     //34,35,36,37
     58   MBlaze::LBUI,  MBlaze::LHUI,   MBlaze::LWI,    UNSUPPORTED,     //38,39,3A,3B
     59   MBlaze::SBI,   MBlaze::SHI,    MBlaze::SWI,    UNSUPPORTED,     //3C,3D,3E,3F
     60 };
     61 
     62 static unsigned getRD(uint32_t insn) {
     63   if (!isMBlazeRegister((insn>>21)&0x1F))
     64     return UNSUPPORTED;
     65   return getMBlazeRegisterFromNumbering((insn>>21)&0x1F);
     66 }
     67 
     68 static unsigned getRA(uint32_t insn) {
     69   if (!getMBlazeRegisterFromNumbering((insn>>16)&0x1F))
     70     return UNSUPPORTED;
     71   return getMBlazeRegisterFromNumbering((insn>>16)&0x1F);
     72 }
     73 
     74 static unsigned getRB(uint32_t insn) {
     75   if (!getMBlazeRegisterFromNumbering((insn>>11)&0x1F))
     76     return UNSUPPORTED;
     77   return getMBlazeRegisterFromNumbering((insn>>11)&0x1F);
     78 }
     79 
     80 static int64_t getRS(uint32_t insn) {
     81   if (!isSpecialMBlazeRegister(insn&0x3FFF))
     82     return UNSUPPORTED;
     83   return getSpecialMBlazeRegisterFromNumbering(insn&0x3FFF);
     84 }
     85 
     86 static int64_t getIMM(uint32_t insn) {
     87     int16_t val = (insn & 0xFFFF);
     88     return val;
     89 }
     90 
     91 static int64_t getSHT(uint32_t insn) {
     92     int16_t val = (insn & 0x1F);
     93     return val;
     94 }
     95 
     96 static unsigned getFLAGS(int32_t insn) {
     97     return (insn & 0x7FF);
     98 }
     99 
    100 static int64_t getFSL(uint32_t insn) {
    101     int16_t val = (insn & 0xF);
    102     return val;
    103 }
    104 
    105 static unsigned decodeMUL(uint32_t insn) {
    106     switch (getFLAGS(insn)) {
    107     default: return UNSUPPORTED;
    108     case 0:  return MBlaze::MUL;
    109     case 1:  return MBlaze::MULH;
    110     case 2:  return MBlaze::MULHSU;
    111     case 3:  return MBlaze::MULHU;
    112     }
    113 }
    114 
    115 static unsigned decodeSEXT(uint32_t insn) {
    116     switch (insn&0x7FF) {
    117     default:   return UNSUPPORTED;
    118     case 0x60: return MBlaze::SEXT8;
    119     case 0x68: return MBlaze::WIC;
    120     case 0x64: return MBlaze::WDC;
    121     case 0x66: return MBlaze::WDCC;
    122     case 0x74: return MBlaze::WDCF;
    123     case 0x61: return MBlaze::SEXT16;
    124     case 0x41: return MBlaze::SRL;
    125     case 0x21: return MBlaze::SRC;
    126     case 0x01: return MBlaze::SRA;
    127     }
    128 }
    129 
    130 static unsigned decodeBEQ(uint32_t insn) {
    131     switch ((insn>>21)&0x1F) {
    132     default:    return UNSUPPORTED;
    133     case 0x00:  return MBlaze::BEQ;
    134     case 0x10:  return MBlaze::BEQD;
    135     case 0x05:  return MBlaze::BGE;
    136     case 0x15:  return MBlaze::BGED;
    137     case 0x04:  return MBlaze::BGT;
    138     case 0x14:  return MBlaze::BGTD;
    139     case 0x03:  return MBlaze::BLE;
    140     case 0x13:  return MBlaze::BLED;
    141     case 0x02:  return MBlaze::BLT;
    142     case 0x12:  return MBlaze::BLTD;
    143     case 0x01:  return MBlaze::BNE;
    144     case 0x11:  return MBlaze::BNED;
    145     }
    146 }
    147 
    148 static unsigned decodeBEQI(uint32_t insn) {
    149     switch ((insn>>21)&0x1F) {
    150     default:    return UNSUPPORTED;
    151     case 0x00:  return MBlaze::BEQI;
    152     case 0x10:  return MBlaze::BEQID;
    153     case 0x05:  return MBlaze::BGEI;
    154     case 0x15:  return MBlaze::BGEID;
    155     case 0x04:  return MBlaze::BGTI;
    156     case 0x14:  return MBlaze::BGTID;
    157     case 0x03:  return MBlaze::BLEI;
    158     case 0x13:  return MBlaze::BLEID;
    159     case 0x02:  return MBlaze::BLTI;
    160     case 0x12:  return MBlaze::BLTID;
    161     case 0x01:  return MBlaze::BNEI;
    162     case 0x11:  return MBlaze::BNEID;
    163     }
    164 }
    165 
    166 static unsigned decodeBR(uint32_t insn) {
    167     switch ((insn>>16)&0x1F) {
    168     default:   return UNSUPPORTED;
    169     case 0x00: return MBlaze::BR;
    170     case 0x08: return MBlaze::BRA;
    171     case 0x0C: return MBlaze::BRK;
    172     case 0x10: return MBlaze::BRD;
    173     case 0x14: return MBlaze::BRLD;
    174     case 0x18: return MBlaze::BRAD;
    175     case 0x1C: return MBlaze::BRALD;
    176     }
    177 }
    178 
    179 static unsigned decodeBRI(uint32_t insn) {
    180     switch ((insn>>16)&0x1F) {
    181     default:   return UNSUPPORTED;
    182     case 0x00: return MBlaze::BRI;
    183     case 0x08: return MBlaze::BRAI;
    184     case 0x0C: return MBlaze::BRKI;
    185     case 0x10: return MBlaze::BRID;
    186     case 0x14: return MBlaze::BRLID;
    187     case 0x18: return MBlaze::BRAID;
    188     case 0x1C: return MBlaze::BRALID;
    189     }
    190 }
    191 
    192 static unsigned decodeBSRL(uint32_t insn) {
    193     switch ((insn>>9)&0x3) {
    194     default:  return UNSUPPORTED;
    195     case 0x2: return MBlaze::BSLL;
    196     case 0x1: return MBlaze::BSRA;
    197     case 0x0: return MBlaze::BSRL;
    198     }
    199 }
    200 
    201 static unsigned decodeBSRLI(uint32_t insn) {
    202     switch ((insn>>9)&0x3) {
    203     default:  return UNSUPPORTED;
    204     case 0x2: return MBlaze::BSLLI;
    205     case 0x1: return MBlaze::BSRAI;
    206     case 0x0: return MBlaze::BSRLI;
    207     }
    208 }
    209 
    210 static unsigned decodeRSUBK(uint32_t insn) {
    211     switch (getFLAGS(insn)) {
    212     default:  return UNSUPPORTED;
    213     case 0x0: return MBlaze::RSUBK;
    214     case 0x1: return MBlaze::CMP;
    215     case 0x3: return MBlaze::CMPU;
    216     }
    217 }
    218 
    219 static unsigned decodeFADD(uint32_t insn) {
    220     switch (getFLAGS(insn)) {
    221     default:    return UNSUPPORTED;
    222     case 0x000: return MBlaze::FADD;
    223     case 0x080: return MBlaze::FRSUB;
    224     case 0x100: return MBlaze::FMUL;
    225     case 0x180: return MBlaze::FDIV;
    226     case 0x200: return MBlaze::FCMP_UN;
    227     case 0x210: return MBlaze::FCMP_LT;
    228     case 0x220: return MBlaze::FCMP_EQ;
    229     case 0x230: return MBlaze::FCMP_LE;
    230     case 0x240: return MBlaze::FCMP_GT;
    231     case 0x250: return MBlaze::FCMP_NE;
    232     case 0x260: return MBlaze::FCMP_GE;
    233     case 0x280: return MBlaze::FLT;
    234     case 0x300: return MBlaze::FINT;
    235     case 0x380: return MBlaze::FSQRT;
    236     }
    237 }
    238 
    239 static unsigned decodeGET(uint32_t insn) {
    240     switch ((insn>>10)&0x3F) {
    241     default:   return UNSUPPORTED;
    242     case 0x00: return MBlaze::GET;
    243     case 0x01: return MBlaze::EGET;
    244     case 0x02: return MBlaze::AGET;
    245     case 0x03: return MBlaze::EAGET;
    246     case 0x04: return MBlaze::TGET;
    247     case 0x05: return MBlaze::TEGET;
    248     case 0x06: return MBlaze::TAGET;
    249     case 0x07: return MBlaze::TEAGET;
    250     case 0x08: return MBlaze::CGET;
    251     case 0x09: return MBlaze::ECGET;
    252     case 0x0A: return MBlaze::CAGET;
    253     case 0x0B: return MBlaze::ECAGET;
    254     case 0x0C: return MBlaze::TCGET;
    255     case 0x0D: return MBlaze::TECGET;
    256     case 0x0E: return MBlaze::TCAGET;
    257     case 0x0F: return MBlaze::TECAGET;
    258     case 0x10: return MBlaze::NGET;
    259     case 0x11: return MBlaze::NEGET;
    260     case 0x12: return MBlaze::NAGET;
    261     case 0x13: return MBlaze::NEAGET;
    262     case 0x14: return MBlaze::TNGET;
    263     case 0x15: return MBlaze::TNEGET;
    264     case 0x16: return MBlaze::TNAGET;
    265     case 0x17: return MBlaze::TNEAGET;
    266     case 0x18: return MBlaze::NCGET;
    267     case 0x19: return MBlaze::NECGET;
    268     case 0x1A: return MBlaze::NCAGET;
    269     case 0x1B: return MBlaze::NECAGET;
    270     case 0x1C: return MBlaze::TNCGET;
    271     case 0x1D: return MBlaze::TNECGET;
    272     case 0x1E: return MBlaze::TNCAGET;
    273     case 0x1F: return MBlaze::TNECAGET;
    274     case 0x20: return MBlaze::PUT;
    275     case 0x22: return MBlaze::APUT;
    276     case 0x24: return MBlaze::TPUT;
    277     case 0x26: return MBlaze::TAPUT;
    278     case 0x28: return MBlaze::CPUT;
    279     case 0x2A: return MBlaze::CAPUT;
    280     case 0x2C: return MBlaze::TCPUT;
    281     case 0x2E: return MBlaze::TCAPUT;
    282     case 0x30: return MBlaze::NPUT;
    283     case 0x32: return MBlaze::NAPUT;
    284     case 0x34: return MBlaze::TNPUT;
    285     case 0x36: return MBlaze::TNAPUT;
    286     case 0x38: return MBlaze::NCPUT;
    287     case 0x3A: return MBlaze::NCAPUT;
    288     case 0x3C: return MBlaze::TNCPUT;
    289     case 0x3E: return MBlaze::TNCAPUT;
    290     }
    291 }
    292 
    293 static unsigned decodeGETD(uint32_t insn) {
    294     switch ((insn>>5)&0x3F) {
    295     default:   return UNSUPPORTED;
    296     case 0x00: return MBlaze::GETD;
    297     case 0x01: return MBlaze::EGETD;
    298     case 0x02: return MBlaze::AGETD;
    299     case 0x03: return MBlaze::EAGETD;
    300     case 0x04: return MBlaze::TGETD;
    301     case 0x05: return MBlaze::TEGETD;
    302     case 0x06: return MBlaze::TAGETD;
    303     case 0x07: return MBlaze::TEAGETD;
    304     case 0x08: return MBlaze::CGETD;
    305     case 0x09: return MBlaze::ECGETD;
    306     case 0x0A: return MBlaze::CAGETD;
    307     case 0x0B: return MBlaze::ECAGETD;
    308     case 0x0C: return MBlaze::TCGETD;
    309     case 0x0D: return MBlaze::TECGETD;
    310     case 0x0E: return MBlaze::TCAGETD;
    311     case 0x0F: return MBlaze::TECAGETD;
    312     case 0x10: return MBlaze::NGETD;
    313     case 0x11: return MBlaze::NEGETD;
    314     case 0x12: return MBlaze::NAGETD;
    315     case 0x13: return MBlaze::NEAGETD;
    316     case 0x14: return MBlaze::TNGETD;
    317     case 0x15: return MBlaze::TNEGETD;
    318     case 0x16: return MBlaze::TNAGETD;
    319     case 0x17: return MBlaze::TNEAGETD;
    320     case 0x18: return MBlaze::NCGETD;
    321     case 0x19: return MBlaze::NECGETD;
    322     case 0x1A: return MBlaze::NCAGETD;
    323     case 0x1B: return MBlaze::NECAGETD;
    324     case 0x1C: return MBlaze::TNCGETD;
    325     case 0x1D: return MBlaze::TNECGETD;
    326     case 0x1E: return MBlaze::TNCAGETD;
    327     case 0x1F: return MBlaze::TNECAGETD;
    328     case 0x20: return MBlaze::PUTD;
    329     case 0x22: return MBlaze::APUTD;
    330     case 0x24: return MBlaze::TPUTD;
    331     case 0x26: return MBlaze::TAPUTD;
    332     case 0x28: return MBlaze::CPUTD;
    333     case 0x2A: return MBlaze::CAPUTD;
    334     case 0x2C: return MBlaze::TCPUTD;
    335     case 0x2E: return MBlaze::TCAPUTD;
    336     case 0x30: return MBlaze::NPUTD;
    337     case 0x32: return MBlaze::NAPUTD;
    338     case 0x34: return MBlaze::TNPUTD;
    339     case 0x36: return MBlaze::TNAPUTD;
    340     case 0x38: return MBlaze::NCPUTD;
    341     case 0x3A: return MBlaze::NCAPUTD;
    342     case 0x3C: return MBlaze::TNCPUTD;
    343     case 0x3E: return MBlaze::TNCAPUTD;
    344     }
    345 }
    346 
    347 static unsigned decodeIDIV(uint32_t insn) {
    348     switch (insn&0x3) {
    349     default:  return UNSUPPORTED;
    350     case 0x0: return MBlaze::IDIV;
    351     case 0x2: return MBlaze::IDIVU;
    352     }
    353 }
    354 
    355 static unsigned decodeLBU(uint32_t insn) {
    356     switch ((insn>>9)&0x1) {
    357     default:  return UNSUPPORTED;
    358     case 0x0: return MBlaze::LBU;
    359     case 0x1: return MBlaze::LBUR;
    360     }
    361 }
    362 
    363 static unsigned decodeLHU(uint32_t insn) {
    364     switch ((insn>>9)&0x1) {
    365     default:  return UNSUPPORTED;
    366     case 0x0: return MBlaze::LHU;
    367     case 0x1: return MBlaze::LHUR;
    368     }
    369 }
    370 
    371 static unsigned decodeLW(uint32_t insn) {
    372     switch ((insn>>9)&0x3) {
    373     default:  return UNSUPPORTED;
    374     case 0x0: return MBlaze::LW;
    375     case 0x1: return MBlaze::LWR;
    376     case 0x2: return MBlaze::LWX;
    377     }
    378 }
    379 
    380 static unsigned decodeSB(uint32_t insn) {
    381     switch ((insn>>9)&0x1) {
    382     default:  return UNSUPPORTED;
    383     case 0x0: return MBlaze::SB;
    384     case 0x1: return MBlaze::SBR;
    385     }
    386 }
    387 
    388 static unsigned decodeSH(uint32_t insn) {
    389     switch ((insn>>9)&0x1) {
    390     default:  return UNSUPPORTED;
    391     case 0x0: return MBlaze::SH;
    392     case 0x1: return MBlaze::SHR;
    393     }
    394 }
    395 
    396 static unsigned decodeSW(uint32_t insn) {
    397     switch ((insn>>9)&0x3) {
    398     default:  return UNSUPPORTED;
    399     case 0x0: return MBlaze::SW;
    400     case 0x1: return MBlaze::SWR;
    401     case 0x2: return MBlaze::SWX;
    402     }
    403 }
    404 
    405 static unsigned decodeMFS(uint32_t insn) {
    406     switch ((insn>>15)&0x1) {
    407     default:   return UNSUPPORTED;
    408     case 0x0:
    409       switch ((insn>>16)&0x1) {
    410       default:   return UNSUPPORTED;
    411       case 0x0: return MBlaze::MSRSET;
    412       case 0x1: return MBlaze::MSRCLR;
    413       }
    414     case 0x1:
    415       switch ((insn>>14)&0x1) {
    416       default:   return UNSUPPORTED;
    417       case 0x0: return MBlaze::MFS;
    418       case 0x1: return MBlaze::MTS;
    419       }
    420     }
    421 }
    422 
    423 static unsigned decodeOR(uint32_t insn) {
    424     switch (getFLAGS(insn)) {
    425     default:    return UNSUPPORTED;
    426     case 0x000: return MBlaze::OR;
    427     case 0x400: return MBlaze::PCMPBF;
    428     }
    429 }
    430 
    431 static unsigned decodeXOR(uint32_t insn) {
    432     switch (getFLAGS(insn)) {
    433     default:    return UNSUPPORTED;
    434     case 0x000: return MBlaze::XOR;
    435     case 0x400: return MBlaze::PCMPEQ;
    436     }
    437 }
    438 
    439 static unsigned decodeANDN(uint32_t insn) {
    440     switch (getFLAGS(insn)) {
    441     default:    return UNSUPPORTED;
    442     case 0x000: return MBlaze::ANDN;
    443     case 0x400: return MBlaze::PCMPNE;
    444     }
    445 }
    446 
    447 static unsigned decodeRTSD(uint32_t insn) {
    448     switch ((insn>>21)&0x1F) {
    449     default:   return UNSUPPORTED;
    450     case 0x10: return MBlaze::RTSD;
    451     case 0x11: return MBlaze::RTID;
    452     case 0x12: return MBlaze::RTBD;
    453     case 0x14: return MBlaze::RTED;
    454     }
    455 }
    456 
    457 static unsigned getOPCODE(uint32_t insn) {
    458   unsigned opcode = mblazeBinary2Opcode[ (insn>>26)&0x3F ];
    459   switch (opcode) {
    460   case MBlaze::MUL:     return decodeMUL(insn);
    461   case MBlaze::SEXT8:   return decodeSEXT(insn);
    462   case MBlaze::BEQ:     return decodeBEQ(insn);
    463   case MBlaze::BEQI:    return decodeBEQI(insn);
    464   case MBlaze::BR:      return decodeBR(insn);
    465   case MBlaze::BRI:     return decodeBRI(insn);
    466   case MBlaze::BSRL:    return decodeBSRL(insn);
    467   case MBlaze::BSRLI:   return decodeBSRLI(insn);
    468   case MBlaze::RSUBK:   return decodeRSUBK(insn);
    469   case MBlaze::FADD:    return decodeFADD(insn);
    470   case MBlaze::GET:     return decodeGET(insn);
    471   case MBlaze::GETD:    return decodeGETD(insn);
    472   case MBlaze::IDIV:    return decodeIDIV(insn);
    473   case MBlaze::LBU:     return decodeLBU(insn);
    474   case MBlaze::LHU:     return decodeLHU(insn);
    475   case MBlaze::LW:      return decodeLW(insn);
    476   case MBlaze::SB:      return decodeSB(insn);
    477   case MBlaze::SH:      return decodeSH(insn);
    478   case MBlaze::SW:      return decodeSW(insn);
    479   case MBlaze::MFS:     return decodeMFS(insn);
    480   case MBlaze::OR:      return decodeOR(insn);
    481   case MBlaze::XOR:     return decodeXOR(insn);
    482   case MBlaze::ANDN:    return decodeANDN(insn);
    483   case MBlaze::RTSD:    return decodeRTSD(insn);
    484   default:              return opcode;
    485   }
    486 }
    487 
    488 EDInstInfo *MBlazeDisassembler::getEDInfo() const {
    489   return instInfoMBlaze;
    490 }
    491 
    492 //
    493 // Public interface for the disassembler
    494 //
    495 
    496 MCDisassembler::DecodeStatus MBlazeDisassembler::getInstruction(MCInst &instr,
    497                                         uint64_t &size,
    498                                         const MemoryObject &region,
    499                                         uint64_t address,
    500                                         raw_ostream &vStream,
    501                                         raw_ostream &cStream) const {
    502   // The machine instruction.
    503   uint32_t insn;
    504   uint64_t read;
    505   uint8_t bytes[4];
    506 
    507   // By default we consume 1 byte on failure
    508   size = 1;
    509 
    510   // We want to read exactly 4 bytes of data.
    511   if (region.readBytes(address, 4, (uint8_t*)bytes, &read) == -1 || read < 4)
    512     return Fail;
    513 
    514   // Encoded as a big-endian 32-bit word in the stream.
    515   insn = (bytes[0]<<24) | (bytes[1]<<16) | (bytes[2]<< 8) | (bytes[3]<<0);
    516 
    517   // Get the MCInst opcode from the binary instruction and make sure
    518   // that it is a valid instruction.
    519   unsigned opcode = getOPCODE(insn);
    520   if (opcode == UNSUPPORTED)
    521     return Fail;
    522 
    523   instr.setOpcode(opcode);
    524 
    525   unsigned RD = getRD(insn);
    526   unsigned RA = getRA(insn);
    527   unsigned RB = getRB(insn);
    528   unsigned RS = getRS(insn);
    529 
    530   uint64_t tsFlags = MBlazeInsts[opcode].TSFlags;
    531   switch ((tsFlags & MBlazeII::FormMask)) {
    532   default:
    533     return Fail;
    534 
    535   case MBlazeII::FRRRR:
    536     if (RD == UNSUPPORTED || RA == UNSUPPORTED || RB == UNSUPPORTED)
    537       return Fail;
    538     instr.addOperand(MCOperand::CreateReg(RD));
    539     instr.addOperand(MCOperand::CreateReg(RB));
    540     instr.addOperand(MCOperand::CreateReg(RA));
    541     break;
    542 
    543   case MBlazeII::FRRR:
    544     if (RD == UNSUPPORTED || RA == UNSUPPORTED || RB == UNSUPPORTED)
    545       return Fail;
    546     instr.addOperand(MCOperand::CreateReg(RD));
    547     instr.addOperand(MCOperand::CreateReg(RA));
    548     instr.addOperand(MCOperand::CreateReg(RB));
    549     break;
    550 
    551   case MBlazeII::FRI:
    552     switch (opcode) {
    553     default:
    554       return Fail;
    555     case MBlaze::MFS:
    556       if (RD == UNSUPPORTED)
    557         return Fail;
    558       instr.addOperand(MCOperand::CreateReg(RD));
    559       instr.addOperand(MCOperand::CreateImm(insn&0x3FFF));
    560       break;
    561     case MBlaze::MTS:
    562       if (RA == UNSUPPORTED)
    563         return Fail;
    564       instr.addOperand(MCOperand::CreateImm(insn&0x3FFF));
    565       instr.addOperand(MCOperand::CreateReg(RA));
    566       break;
    567     case MBlaze::MSRSET:
    568     case MBlaze::MSRCLR:
    569       if (RD == UNSUPPORTED)
    570         return Fail;
    571       instr.addOperand(MCOperand::CreateReg(RD));
    572       instr.addOperand(MCOperand::CreateImm(insn&0x7FFF));
    573       break;
    574     }
    575     break;
    576 
    577   case MBlazeII::FRRI:
    578     if (RD == UNSUPPORTED || RA == UNSUPPORTED)
    579       return Fail;
    580     instr.addOperand(MCOperand::CreateReg(RD));
    581     instr.addOperand(MCOperand::CreateReg(RA));
    582     switch (opcode) {
    583     default:
    584       instr.addOperand(MCOperand::CreateImm(getIMM(insn)));
    585       break;
    586     case MBlaze::BSRLI:
    587     case MBlaze::BSRAI:
    588     case MBlaze::BSLLI:
    589       instr.addOperand(MCOperand::CreateImm(insn&0x1F));
    590       break;
    591     }
    592     break;
    593 
    594   case MBlazeII::FCRR:
    595     if (RA == UNSUPPORTED || RB == UNSUPPORTED)
    596       return Fail;
    597     instr.addOperand(MCOperand::CreateReg(RA));
    598     instr.addOperand(MCOperand::CreateReg(RB));
    599     break;
    600 
    601   case MBlazeII::FCRI:
    602     if (RA == UNSUPPORTED)
    603       return Fail;
    604     instr.addOperand(MCOperand::CreateReg(RA));
    605     instr.addOperand(MCOperand::CreateImm(getIMM(insn)));
    606     break;
    607 
    608   case MBlazeII::FRCR:
    609     if (RD == UNSUPPORTED || RB == UNSUPPORTED)
    610       return Fail;
    611     instr.addOperand(MCOperand::CreateReg(RD));
    612     instr.addOperand(MCOperand::CreateReg(RB));
    613     break;
    614 
    615   case MBlazeII::FRCI:
    616     if (RD == UNSUPPORTED)
    617       return Fail;
    618     instr.addOperand(MCOperand::CreateReg(RD));
    619     instr.addOperand(MCOperand::CreateImm(getIMM(insn)));
    620     break;
    621 
    622   case MBlazeII::FCCR:
    623     if (RB == UNSUPPORTED)
    624       return Fail;
    625     instr.addOperand(MCOperand::CreateReg(RB));
    626     break;
    627 
    628   case MBlazeII::FCCI:
    629     instr.addOperand(MCOperand::CreateImm(getIMM(insn)));
    630     break;
    631 
    632   case MBlazeII::FRRCI:
    633     if (RD == UNSUPPORTED || RA == UNSUPPORTED)
    634       return Fail;
    635     instr.addOperand(MCOperand::CreateReg(RD));
    636     instr.addOperand(MCOperand::CreateReg(RA));
    637     instr.addOperand(MCOperand::CreateImm(getSHT(insn)));
    638     break;
    639 
    640   case MBlazeII::FRRC:
    641     if (RD == UNSUPPORTED || RA == UNSUPPORTED)
    642       return Fail;
    643     instr.addOperand(MCOperand::CreateReg(RD));
    644     instr.addOperand(MCOperand::CreateReg(RA));
    645     break;
    646 
    647   case MBlazeII::FRCX:
    648     if (RD == UNSUPPORTED)
    649       return Fail;
    650     instr.addOperand(MCOperand::CreateReg(RD));
    651     instr.addOperand(MCOperand::CreateImm(getFSL(insn)));
    652     break;
    653 
    654   case MBlazeII::FRCS:
    655     if (RD == UNSUPPORTED || RS == UNSUPPORTED)
    656       return Fail;
    657     instr.addOperand(MCOperand::CreateReg(RD));
    658     instr.addOperand(MCOperand::CreateReg(RS));
    659     break;
    660 
    661   case MBlazeII::FCRCS:
    662     if (RS == UNSUPPORTED || RA == UNSUPPORTED)
    663       return Fail;
    664     instr.addOperand(MCOperand::CreateReg(RS));
    665     instr.addOperand(MCOperand::CreateReg(RA));
    666     break;
    667 
    668   case MBlazeII::FCRCX:
    669     if (RA == UNSUPPORTED)
    670       return Fail;
    671     instr.addOperand(MCOperand::CreateReg(RA));
    672     instr.addOperand(MCOperand::CreateImm(getFSL(insn)));
    673     break;
    674 
    675   case MBlazeII::FCX:
    676     instr.addOperand(MCOperand::CreateImm(getFSL(insn)));
    677     break;
    678 
    679   case MBlazeII::FCR:
    680     if (RB == UNSUPPORTED)
    681       return Fail;
    682     instr.addOperand(MCOperand::CreateReg(RB));
    683     break;
    684 
    685   case MBlazeII::FRIR:
    686     if (RD == UNSUPPORTED || RA == UNSUPPORTED)
    687       return Fail;
    688     instr.addOperand(MCOperand::CreateReg(RD));
    689     instr.addOperand(MCOperand::CreateImm(getIMM(insn)));
    690     instr.addOperand(MCOperand::CreateReg(RA));
    691     break;
    692   }
    693 
    694   // We always consume 4 bytes of data on success
    695   size = 4;
    696 
    697   return Success;
    698 }
    699 
    700 static MCDisassembler *createMBlazeDisassembler(const Target &T,
    701                                                 const MCSubtargetInfo &STI) {
    702   return new MBlazeDisassembler(STI);
    703 }
    704 
    705 extern "C" void LLVMInitializeMBlazeDisassembler() {
    706   // Register the disassembler.
    707   TargetRegistry::RegisterMCDisassembler(TheMBlazeTarget,
    708                                          createMBlazeDisassembler);
    709 }
    710