decoder.isa revision 2706:d88c27f75121
1// -*- mode:c++ -*-
2
3// Copyright (c) 2003-2006 The Regents of The University of Michigan
4// All rights reserved.
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16//
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23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28//
29// Authors: Korey Sewell
30
31////////////////////////////////////////////////////////////////////
32//
33// The actual MIPS32 ISA decoder
34// -----------------------------
35// The following instructions are specified in the MIPS32 ISA
36// Specification. Decoding closely follows the style specified
37// in the MIPS32 ISA specification document starting with Table
38// A-2 (document available @ www.mips.com)
39//
40decode OPCODE_HI default Unknown::unknown() {
41    //Table A-2
42    0x0: decode OPCODE_LO {
43        0x0: decode FUNCTION_HI {
44            0x0: decode FUNCTION_LO {
45                0x1: decode MOVCI {
46                    format BasicOp {
47                        0: movf({{ Rd = (getCondCode(FCSR, CC) == 0) ? Rd : Rs; }});
48                        1: movt({{ Rd = (getCondCode(FCSR, CC) == 1) ? Rd : Rs; }});
49                    }
50                }
51
52                format BasicOp {
53                    //Table A-3 Note: "Specific encodings of the rd, rs, and
54                    //rt fields are used to distinguish SLL, SSNOP, and EHB
55                    //functions
56                    0x0: decode RS  {
57                        0x0: decode RT_RD {
58                            0x0: decode SA default Nop::nop(){
59                                0x1: WarnUnimpl::ssnop();
60                                0x3: WarnUnimpl::ehb();
61                            }
62                            default: sll({{ Rd = Rt.uw << SA; }});
63                        }
64                    }
65
66                    0x2: decode RS_SRL {
67                        0x0:decode SRL {
68                            0: srl({{ Rd = Rt.uw >> SA; }});
69
70                            //Hardcoded assuming 32-bit ISA, probably need parameter here
71                            1: rotr({{ Rd = (Rt.uw << (32 - SA)) | (Rt.uw >> SA);}});
72                        }
73                    }
74
75                    0x3: decode RS {
76                        0x0: sra({{
77                            uint32_t temp = Rt >> SA;
78                            if ( (Rt & 0x80000000) > 0 ) {
79                                uint32_t mask = 0x80000000;
80                                for(int i=0; i < SA; i++) {
81                                    temp |= mask;
82                                    mask = mask >> 1;
83                                }
84                            }
85                            Rd = temp;
86                        }});
87                    }
88
89                    0x4: sllv({{ Rd = Rt.uw << Rs<4:0>; }});
90
91                    0x6: decode SRLV {
92                        0: srlv({{ Rd = Rt.uw >> Rs<4:0>; }});
93
94                        //Hardcoded assuming 32-bit ISA, probably need parameter here
95                        1: rotrv({{ Rd = (Rt.uw << (32 - Rs<4:0>)) | (Rt.uw >> Rs<4:0>);}});
96                    }
97
98                    0x7: srav({{
99                        int shift_amt = Rs<4:0>;
100
101                        uint32_t temp = Rt >> shift_amt;
102
103                        if ( (Rt & 0x80000000) > 0 ) {
104                                uint32_t mask = 0x80000000;
105                                for(int i=0; i < shift_amt; i++) {
106                                    temp |= mask;
107                                    mask = mask >> 1;
108                                }
109                            }
110
111                        Rd = temp;
112                    }});
113                }
114            }
115
116            0x1: decode FUNCTION_LO {
117                //Table A-3 Note: "Specific encodings of the hint field are
118                //used to distinguish JR from JR.HB and JALR from JALR.HB"
119                format Jump {
120                    0x0: decode HINT {
121                        0x1: jr_hb({{ NNPC = Rs & ~1; }}, IsReturn, ClearHazards);
122                        default: jr({{ NNPC = Rs & ~1; }}, IsReturn);
123                    }
124
125                    0x1: decode HINT {
126                        0x1: jalr_hb({{ Rd = NNPC; NNPC = Rs; }}, IsCall, Link
127                                     , ClearHazards);
128                        default: jalr({{ Rd = NNPC; NNPC = Rs; }}, IsCall,
129                                      Link);
130                    }
131                }
132
133                format BasicOp {
134                    0x2: movz({{ Rd = (Rt == 0) ? Rs : Rd; }});
135                    0x3: movn({{ Rd = (Rt != 0) ? Rs : Rd; }});
136                    0x4: syscall({{ xc->syscall(R2); }}, IsNonSpeculative);
137                    0x7: sync({{ ; }}, IsMemBarrier);
138                }
139
140                format FailUnimpl {
141                    0x5: break();
142                }
143            }
144
145            0x2: decode FUNCTION_LO {
146                format HiLoMiscOp {
147                    0x0: mfhi({{ Rd = HI; }});
148                    0x1: mthi({{ HI = Rs; }});
149                    0x2: mflo({{ Rd = LO; }});
150                    0x3: mtlo({{ LO = Rs; }});
151                }
152            }
153
154            0x3: decode FUNCTION_LO {
155                format HiLoOp {
156                    0x0: mult({{ val = Rs.sd * Rt.sd; }});
157                    0x1: multu({{ val = Rs.ud * Rt.ud; }});
158                }
159
160                format HiLoMiscOp {
161                    0x2: div({{
162                        HI = Rs.sd % Rt.sd;
163                        LO = Rs.sd / Rt.sd;
164                    }});
165                    0x3: divu({{
166                        HI = Rs.ud % Rt.ud;
167                        LO = Rs.ud / Rt.ud;
168                    }});
169                }
170            }
171
172            0x4: decode HINT {
173                0x0: decode FUNCTION_LO {
174                    format IntOp {
175                        0x0: add({{  Rd.sw = Rs.sw + Rt.sw; /*Trap on Overflow*/}});
176                        0x1: addu({{ Rd.sw = Rs.sw + Rt.sw;}});
177                        0x2: sub({{ Rd.sw = Rs.sw - Rt.sw;  /*Trap on Overflow*/}});
178                        0x3: subu({{ Rd.sw = Rs.sw - Rt.sw;}});
179                        0x4: and({{ Rd = Rs & Rt;}});
180                        0x5: or({{ Rd = Rs | Rt;}});
181                        0x6: xor({{ Rd = Rs ^ Rt;}});
182                        0x7: nor({{ Rd = ~(Rs | Rt);}});
183                    }
184                }
185            }
186
187            0x5: decode HINT {
188                0x0: decode FUNCTION_LO {
189                    format IntOp{
190                        0x2: slt({{  Rd.sw = ( Rs.sw < Rt.sw ) ? 1 : 0}});
191                        0x3: sltu({{ Rd.uw = ( Rs.uw < Rt.uw ) ? 1 : 0}});
192                    }
193                }
194            }
195
196            0x6: decode FUNCTION_LO {
197                format Trap {
198                    0x0: tge({{  cond = (Rs.sw >= Rt.sw); }});
199                    0x1: tgeu({{ cond = (Rs.uw >= Rt.uw); }});
200                    0x2: tlt({{ cond = (Rs.sw < Rt.sw); }});
201                    0x3: tltu({{ cond = (Rs.uw >= Rt.uw); }});
202                    0x4: teq({{ cond = (Rs.sw == Rt.sw); }});
203                    0x6: tne({{ cond = (Rs.sw != Rt.sw); }});
204                }
205            }
206        }
207
208        0x1: decode REGIMM_HI {
209            0x0: decode REGIMM_LO {
210                format Branch {
211                    0x0: bltz({{ cond = (Rs.sw < 0); }});
212                    0x1: bgez({{ cond = (Rs.sw >= 0); }});
213                    0x2: bltzl({{ cond = (Rs.sw < 0); }}, Likely);
214                    0x3: bgezl({{ cond = (Rs.sw >= 0); }}, Likely);
215                }
216            }
217
218            0x1: decode REGIMM_LO {
219                format Trap {
220                    0x0: tgei( {{ cond = (Rs.sw >= INTIMM); }});
221                    0x1: tgeiu({{ cond = (Rs.uw >= INTIMM); }});
222                    0x2: tlti( {{ cond = (Rs.sw < INTIMM); }});
223                    0x3: tltiu({{ cond = (Rs.uw < INTIMM); }});
224                    0x4: teqi( {{ cond = (Rs.sw == INTIMM);}});
225                    0x6: tnei( {{ cond = (Rs.sw != INTIMM);}});
226                }
227            }
228
229            0x2: decode REGIMM_LO {
230                format Branch {
231                    0x0: bltzal({{ cond = (Rs.sw < 0); }}, Link);
232                    0x1: decode RS {
233                        0x0: bal ({{ cond = 1; }}, IsCall, Link);
234                        default: bgezal({{ cond = (Rs.sw >= 0); }}, Link);
235                    }
236                    0x2: bltzall({{ cond = (Rs.sw < 0); }}, Link, Likely);
237                    0x3: bgezall({{ cond = (Rs.sw >= 0); }}, Link, Likely);
238                }
239            }
240
241            0x3: decode REGIMM_LO {
242                format WarnUnimpl {
243                    0x7: synci();
244                }
245            }
246        }
247
248        format Jump {
249            0x2: j({{ NNPC = (NPC & 0xF0000000) | (JMPTARG << 2);}});
250            0x3: jal({{ NNPC = (NPC & 0xF0000000) | (JMPTARG << 2); }}, IsCall,
251                     Link);
252        }
253
254        format Branch {
255            0x4: decode RS_RT  {
256                0x0: b({{ cond = 1; }});
257                default: beq({{ cond = (Rs.sw == Rt.sw); }});
258            }
259            0x5: bne({{ cond = (Rs.sw != Rt.sw); }});
260            0x6: blez({{ cond = (Rs.sw <= 0); }});
261            0x7: bgtz({{ cond = (Rs.sw > 0); }});
262        }
263    }
264
265    0x1: decode OPCODE_LO {
266        format IntImmOp {
267            0x0: addi({{ Rt.sw = Rs.sw + imm; /*Trap If Overflow*/}});
268            0x1: addiu({{ Rt.sw = Rs.sw + imm;}});
269            0x2: slti({{ Rt.sw = ( Rs.sw < imm) ? 1 : 0 }});
270            0x3: sltiu({{ Rt.uw = ( Rs.uw < (uint32_t)sextImm ) ? 1 : 0 }});
271            0x4: andi({{ Rt.sw = Rs.sw & zextImm;}});
272            0x5: ori({{ Rt.sw = Rs.sw | zextImm;}});
273            0x6: xori({{ Rt.sw = Rs.sw ^ zextImm;}});
274
275            0x7: decode RS {
276                0x0: lui({{ Rt = imm << 16}});
277            }
278        }
279    }
280
281    0x2: decode OPCODE_LO {
282        //Table A-11 MIPS32 COP0 Encoding of rs Field
283        0x0: decode RS_MSB {
284            0x0: decode RS {
285                format CP0Control {
286                    0x0: mfc0({{ Rt = xc->readMiscReg(RD << 5 | SEL); }});
287                    0x4: mtc0({{ xc->setMiscReg(RD << 5 | SEL, Rt); }});
288                }
289
290                format MipsMT {
291                    0x8: mftr();
292                    0xC: mttr();
293                    0xB: decode RD {
294                        0x0: decode SC {
295                            0x0: dvpe();
296                            0x1: evpe();
297                        }
298                        0x1: decode SC {
299                            0x0: dmt();
300                            0x1: emt();
301                            0xC: decode SC {
302                                0x0: di();
303                                0x1: ei();
304                            }
305                        }
306                    }
307                }
308
309                format FailUnimpl {
310                    0xA: rdpgpr();
311                    0xE: wrpgpr();
312                }
313            }
314
315            //Table A-12 MIPS32 COP0 Encoding of Function Field When rs=CO
316            0x1: decode FUNCTION {
317                format FailUnimpl {
318                    0x01: tlbr();
319                    0x02: tlbwi();
320                    0x06: tlbwr();
321                    0x08: tlbp();
322
323                    0x18: eret();
324                    0x1F: deret();
325                    0x20: wait();
326                }
327            }
328        }
329
330        //Table A-13 MIPS32 COP1 Encoding of rs Field
331        0x1: decode RS_MSB {
332
333            0x0: decode RS_HI {
334                0x0: decode RS_LO {
335                    format CP1Control {
336                        0x0: mfc1 ({{ Rt.uw = Fs.uw<31:0>; }});
337
338                        0x2: cfc1({{
339                            switch (FS)
340                            {
341                              case 0:
342                                Rt = FIR;
343                                break;
344                              case 25:
345                                Rt = 0 | (FCSR & 0xFE000000) >> 24 | (FCSR & 0x00800000) >> 23;
346                                break;
347                              case 26:
348                                Rt = 0 | (FCSR & 0x0003F07C);
349                                break;
350                              case 28:
351                                Rt = 0 | (FCSR & 0x00000F80) | (FCSR & 0x01000000) >> 21 | (FCSR & 0x00000003);
352                                break;
353                              case 31:
354                                Rt = FCSR;
355                                break;
356                              default:
357                                panic("FP Control Value (%d) Not Valid");
358                            }
359                        }});
360
361                        0x3: mfhc1({{ Rt.uw = Fs.ud<63:32>;}});
362
363                        0x4: mtc1 ({{ Fs.uw = Rt.uw;       }});
364
365                        0x6: ctc1({{
366                            switch (FS)
367                            {
368                              case 25:
369                                FCSR = 0 | (Rt.uw<7:1> << 25) // move 31...25
370                                    | (FCSR & 0x01000000) // bit 24
371                                    | (FCSR & 0x004FFFFF);// bit 22...0
372                                break;
373
374                              case 26:
375                                FCSR = 0 | (FCSR & 0xFFFC0000) // move 31...18
376                                    | Rt.uw<17:12> << 12           // bit 17...12
377                                    | (FCSR & 0x00000F80) << 7// bit 11...7
378                                    | Rt.uw<6:2> << 2              // bit 6...2
379                                    | (FCSR & 0x00000002);     // bit 1...0
380                                break;
381
382                              case 28:
383                                FCSR = 0 | (FCSR & 0xFE000000) // move 31...25
384                                    | Rt.uw<2:2> << 24       // bit 24
385                                    | (FCSR & 0x00FFF000) << 23// bit 23...12
386                                    | Rt.uw<11:7> << 7       // bit 24
387                                    | (FCSR & 0x000007E)
388                                    | Rt.uw<1:0>;// bit 22...0
389                                break;
390
391                              case 31:
392                                FCSR  = Rt.uw;
393                                break;
394
395                              default:
396                                panic("FP Control Value (%d) Not Available. Ignoring Access to"
397                                      "Floating Control Status Register", FS);
398                            }
399                        }});
400
401                        0x7: mthc1({{
402                             uint64_t fs_hi = Rt.uw;
403                             uint64_t fs_lo = Fs.ud & 0x0FFFFFFFF;
404                             Fs.ud = (fs_hi << 32) | fs_lo;
405                        }});
406
407                    }
408                }
409
410                0x1: decode ND {
411                    format Branch {
412                        0x0: decode TF {
413                            0x0: bc1f({{ cond = getCondCode(FCSR, BRANCH_CC) == 0;
414                                      }});
415                            0x1: bc1t({{ cond = getCondCode(FCSR, BRANCH_CC) == 1;
416                                      }});
417                        }
418                        0x1: decode TF {
419                            0x0: bc1fl({{ cond = getCondCode(FCSR, BRANCH_CC) == 0;
420                                       }}, Likely);
421                            0x1: bc1tl({{ cond = getCondCode(FCSR, BRANCH_CC) == 1;
422                                       }}, Likely);
423                        }
424                    }
425                }
426            }
427
428            0x1: decode RS_HI {
429                0x2: decode RS_LO {
430                    //Table A-14 MIPS32 COP1 Encoding of Function Field When rs=S
431                    //(( single-precision floating point))
432                    0x0: decode FUNCTION_HI {
433                        0x0: decode FUNCTION_LO {
434                            format FloatOp {
435                                0x0: add_s({{ Fd.sf = Fs.sf + Ft.sf;}});
436                                0x1: sub_s({{ Fd.sf = Fs.sf - Ft.sf;}});
437                                0x2: mul_s({{ Fd.sf = Fs.sf * Ft.sf;}});
438                                0x3: div_s({{ Fd.sf = Fs.sf / Ft.sf;}});
439                                0x4: sqrt_s({{ Fd.sf = sqrt(Fs.sf);}});
440                                0x5: abs_s({{ Fd.sf = fabs(Fs.sf);}});
441                                0x6: mov_s({{ Fd.sf = Fs.sf;}});
442                                0x7: neg_s({{ Fd.sf = -Fs.sf;}});
443                            }
444                        }
445
446                        0x1: decode FUNCTION_LO {
447                            format FloatConvertOp {
448                                0x0: round_l_s({{ val = Fs.sf; }}, ToLong,
449                                               Round);
450                                0x1: trunc_l_s({{ val = Fs.sf; }}, ToLong,
451                                               Trunc);
452                                0x2: ceil_l_s({{ val = Fs.sf; }}, ToLong,
453                                               Ceil);
454                                0x3: floor_l_s({{ val = Fs.sf; }}, ToLong,
455                                               Floor);
456                                0x4: round_w_s({{ val = Fs.sf; }}, ToWord,
457                                               Round);
458                                0x5: trunc_w_s({{ val = Fs.sf; }}, ToWord,
459                                               Trunc);
460                                0x6: ceil_w_s({{ val = Fs.sf; }}, ToWord,
461                                               Ceil);
462                                0x7: floor_w_s({{ val = Fs.sf; }}, ToWord,
463                                               Floor);
464                            }
465                        }
466
467                        0x2: decode FUNCTION_LO {
468                            0x1: decode MOVCF {
469                                format BasicOp {
470                                    0x0: movf_s({{ Fd = (getCondCode(FCSR,CC) == 0) ? Fs : Fd; }});
471                                    0x1: movt_s({{ Fd = (getCondCode(FCSR,CC) == 1) ? Fs : Fd; }});
472                                }
473                            }
474
475                            format BasicOp {
476                                0x2: movz_s({{ Fd = (Rt == 0) ? Fs : Fd; }});
477                                0x3: movn_s({{ Fd = (Rt != 0) ? Fs : Fd; }});
478                            }
479
480                            format FloatOp {
481                                0x5: recip_s({{ Fd = 1 / Fs; }});
482                                0x6: rsqrt_s({{ Fd = 1 / sqrt(Fs);}});
483                            }
484                        }
485
486                        0x4: decode FUNCTION_LO {
487                            format FloatConvertOp {
488                                0x1: cvt_d_s({{ val = Fs.sf; }}, ToDouble);
489                                0x4: cvt_w_s({{ val = Fs.sf; }}, ToWord);
490                                0x5: cvt_l_s({{ val = Fs.sf; }}, ToLong);
491                            }
492
493                            0x6: FloatOp::cvt_ps_s({{
494                                    Fd.ud = (uint64_t) Fs.uw << 32 |
495                                            (uint64_t) Ft.uw;
496                                }});
497                        }
498
499                        0x6: decode FUNCTION_LO {
500                            format FloatCompareOp {
501                                0x0: c_f_s({{ cond = 0; }}, SinglePrecision,
502                                           UnorderedFalse);
503                                0x1: c_un_s({{ cond = 0; }}, SinglePrecision,
504                                            UnorderedTrue);
505                                0x2: c_eq_s({{ cond = (Fs.sf == Ft.sf); }},
506                                            UnorderedFalse);
507                                0x3: c_ueq_s({{ cond = (Fs.sf == Ft.sf); }},
508                                             UnorderedTrue);
509                                0x4: c_olt_s({{ cond = (Fs.sf < Ft.sf);	}},
510                                             UnorderedFalse);
511                                0x5: c_ult_s({{ cond = (Fs.sf < Ft.sf); }},
512                                             UnorderedTrue);
513                                0x6: c_ole_s({{ cond = (Fs.sf <= Ft.sf); }},
514                                             UnorderedFalse);
515                                0x7: c_ule_s({{ cond = (Fs.sf <= Ft.sf); }},
516                                             UnorderedTrue);
517                            }
518                        }
519
520                        0x7: decode FUNCTION_LO {
521                            format FloatCompareOp {
522                                0x0: c_sf_s({{ cond = 0; }}, SinglePrecision,
523                                            UnorderedFalse, QnanException);
524                                0x1: c_ngle_s({{ cond = 0; }}, SinglePrecision,
525                                              UnorderedTrue, QnanException);
526                                0x2: c_seq_s({{ cond = (Fs.sf == Ft.sf);}},
527                                             UnorderedFalse, QnanException);
528                                0x3: c_ngl_s({{ cond = (Fs.sf == Ft.sf); }},
529                                             UnorderedTrue, QnanException);
530                                0x4: c_lt_s({{ cond = (Fs.sf < Ft.sf); }},
531                                            UnorderedFalse, QnanException);
532                                0x5: c_nge_s({{ cond = (Fs.sf < Ft.sf); }},
533                                             UnorderedTrue, QnanException);
534                                0x6: c_le_s({{ cond = (Fs.sf <= Ft.sf); }},
535                                            UnorderedFalse, QnanException);
536                                0x7: c_ngt_s({{ cond = (Fs.sf <= Ft.sf); }},
537                                             UnorderedTrue, QnanException);
538                            }
539                        }
540                    }
541
542                    //Table A-15 MIPS32 COP1 Encoding of Function Field When rs=D
543                    0x1: decode FUNCTION_HI {
544                        0x0: decode FUNCTION_LO {
545                            format FloatOp {
546                                0x0: add_d({{ Fd.df = Fs.df + Ft.df; }});
547                                0x1: sub_d({{ Fd.df = Fs.df - Ft.df; }});
548                                0x2: mul_d({{ Fd.df = Fs.df * Ft.df; }});
549                                0x3: div_d({{ Fd.df = Fs.df / Ft.df; }});
550                                0x4: sqrt_d({{ Fd.df = sqrt(Fs.df);  }});
551                                0x5: abs_d({{ Fd.df = fabs(Fs.df);   }});
552                                0x6: mov_d({{ Fd.df = Fs.df;         }});
553                                0x7: neg_d({{ Fd.df = -1 * Fs.df;    }});
554                            }
555                        }
556
557                        0x1: decode FUNCTION_LO {
558                            format FloatConvertOp {
559                                0x0: round_l_d({{ val = Fs.df; }}, ToLong,
560                                               Round);
561                                0x1: trunc_l_d({{ val = Fs.df; }}, ToLong,
562                                               Trunc);
563                                0x2: ceil_l_d({{ val = Fs.df; }}, ToLong,
564                                               Ceil);
565                                0x3: floor_l_d({{ val = Fs.df; }}, ToLong,
566                                               Floor);
567                                0x4: round_w_d({{ val = Fs.df; }}, ToWord,
568                                               Round);
569                                0x5: trunc_w_d({{ val = Fs.df; }}, ToWord,
570                                               Trunc);
571                                0x6: ceil_w_d({{ val = Fs.df; }}, ToWord,
572                                               Ceil);
573                                0x7: floor_w_d({{ val = Fs.df; }}, ToWord,
574                                               Floor);
575                            }
576                        }
577
578                        0x2: decode FUNCTION_LO {
579                            0x1: decode MOVCF {
580                                format BasicOp {
581                                    0x0: movf_d({{ Fd.df = (getCondCode(FCSR,CC) == 0) ?
582                                                       Fs.df : Fd.df;
583                                                }});
584                                    0x1: movt_d({{ Fd.df = (getCondCode(FCSR,CC) == 1) ?
585                                                       Fs.df : Fd.df;
586                                                }});
587                                }
588                            }
589
590                            format BasicOp {
591                                0x2: movz_d({{ Fd.df = (Rt == 0) ? Fs.df : Fd.df; }});
592                                0x3: movn_d({{ Fd.df = (Rt != 0) ? Fs.df : Fd.df; }});
593                            }
594
595                            format FloatOp {
596                                0x5: recip_d({{ Fd.df = 1 / Fs.df }});
597                                0x6: rsqrt_d({{ Fd.df = 1 / sqrt(Fs.df) }});
598                            }
599                        }
600
601                        0x4: decode FUNCTION_LO {
602                            format FloatConvertOp {
603                                0x0: cvt_s_d({{ val = Fs.df; }}, ToSingle);
604                                0x4: cvt_w_d({{ val = Fs.df; }}, ToWord);
605                                0x5: cvt_l_d({{ val = Fs.df; }}, ToLong);
606                            }
607                        }
608
609                        0x6: decode FUNCTION_LO {
610                            format FloatCompareOp {
611                                0x0: c_f_d({{ cond = 0; }}, DoublePrecision,
612                                           UnorderedFalse);
613                                0x1: c_un_d({{ cond = 0; }}, DoublePrecision,
614                                            UnorderedTrue);
615                                0x2: c_eq_d({{ cond = (Fs.df == Ft.df); }},
616                                            UnorderedFalse);
617                                0x3: c_ueq_d({{ cond = (Fs.df == Ft.df); }},
618                                             UnorderedTrue);
619                                0x4: c_olt_d({{ cond = (Fs.df < Ft.df);	}},
620                                             UnorderedFalse);
621                                0x5: c_ult_d({{ cond = (Fs.df < Ft.df); }},
622                                             UnorderedTrue);
623                                0x6: c_ole_d({{ cond = (Fs.df <= Ft.df); }},
624                                             UnorderedFalse);
625                                0x7: c_ule_d({{ cond = (Fs.df <= Ft.df); }},
626                                             UnorderedTrue);
627                            }
628                        }
629
630                        0x7: decode FUNCTION_LO {
631                            format FloatCompareOp {
632                                0x0: c_sf_d({{ cond = 0; }}, DoublePrecision,
633                                            UnorderedFalse, QnanException);
634                                0x1: c_ngle_d({{ cond = 0; }}, DoublePrecision,
635                                              UnorderedTrue, QnanException);
636                                0x2: c_seq_d({{ cond = (Fs.df == Ft.df); }},
637                                             UnorderedFalse, QnanException);
638                                0x3: c_ngl_d({{ cond = (Fs.df == Ft.df); }},
639                                             UnorderedTrue, QnanException);
640                                0x4: c_lt_d({{ cond = (Fs.df < Ft.df); }},
641                                            UnorderedFalse, QnanException);
642                                0x5: c_nge_d({{ cond = (Fs.df < Ft.df); }},
643                                             UnorderedTrue, QnanException);
644                                0x6: c_le_d({{ cond = (Fs.df <= Ft.df); }},
645                                            UnorderedFalse, QnanException);
646                                0x7: c_ngt_d({{ cond = (Fs.df <= Ft.df); }},
647                                             UnorderedTrue, QnanException);
648                            }
649                        }
650                    }
651
652                    //Table A-16 MIPS32 COP1 Encoding of Function Field When rs=W
653                    0x4: decode FUNCTION {
654                        format FloatConvertOp {
655                            0x20: cvt_s_w({{ val = Fs.uw; }}, ToSingle);
656                            0x21: cvt_d_w({{ val = Fs.uw; }}, ToDouble);
657                            0x26: FailUnimpl::cvt_ps_w();
658                        }
659                    }
660
661                    //Table A-16 MIPS32 COP1 Encoding of Function Field When rs=L1
662                    //Note: "1. Format type L is legal only if 64-bit floating point operations
663                    //are enabled."
664                    0x5: decode FUNCTION_HI {
665                        format FloatConvertOp {
666                            0x20: cvt_s_l({{ val = Fs.ud; }}, ToSingle);
667                            0x21: cvt_d_l({{ val = Fs.ud; }}, ToDouble);
668                            0x26: FailUnimpl::cvt_ps_l();
669                        }
670                    }
671
672                    //Table A-17 MIPS64 COP1 Encoding of Function Field When rs=PS1
673                    //Note: "1. Format type PS is legal only if 64-bit floating point operations
674                    //are enabled. "
675                    0x6: decode FUNCTION_HI {
676                        0x0: decode FUNCTION_LO {
677                            format Float64Op {
678                                0x0: add_ps({{
679                                    Fd1.sf = Fs1.sf + Ft2.sf;
680                                    Fd2.sf = Fs2.sf + Ft2.sf;
681                                }});
682                                0x1: sub_ps({{
683                                    Fd1.sf = Fs1.sf - Ft2.sf;
684                                    Fd2.sf = Fs2.sf - Ft2.sf;
685                                }});
686                                0x2: mul_ps({{
687                                    Fd1.sf = Fs1.sf * Ft2.sf;
688                                    Fd2.sf = Fs2.sf * Ft2.sf;
689                                }});
690                                0x5: abs_ps({{
691                                    Fd1.sf = fabs(Fs1.sf);
692                                    Fd2.sf = fabs(Fs2.sf);
693                                }});
694                                0x6: mov_ps({{
695                                    Fd1.sf = Fs1.sf;
696                                    Fd2.sf = Fs2.sf;
697                                }});
698                                0x7: neg_ps({{
699                                    Fd1.sf = -(Fs1.sf);
700                                    Fd2.sf = -(Fs2.sf);
701                                }});
702                            }
703                        }
704
705                        0x2: decode FUNCTION_LO {
706                            0x1: decode MOVCF {
707                                format Float64Op {
708                                    0x0: movf_ps({{
709                                        Fd1 = (getCondCode(FCSR, CC) == 0) ?
710                                            Fs1 : Fd1;
711                                        Fd2 = (getCondCode(FCSR, CC+1) == 0) ?
712                                            Fs2 : Fd2;
713                                    }});
714                                    0x1: movt_ps({{
715                                        Fd2 = (getCondCode(FCSR, CC) == 1) ?
716                                            Fs1 : Fd1;
717                                        Fd2 = (getCondCode(FCSR, CC+1) == 1) ?
718                                            Fs2 : Fd2;
719                                    }});
720                                }
721                            }
722
723                            format Float64Op {
724                                0x2: movz_ps({{
725                                    Fd1 = (getCondCode(FCSR, CC) == 0) ?
726                                        Fs1 : Fd1;
727                                    Fd2 = (getCondCode(FCSR, CC) == 0) ?
728                                        Fs2 : Fd2;
729                                }});
730                                0x3: movn_ps({{
731                                    Fd1 = (getCondCode(FCSR, CC) == 1) ?
732                                        Fs1 : Fd1;
733                                    Fd2 = (getCondCode(FCSR, CC) == 1) ?
734                                        Fs2 : Fd2;
735                                }});
736                            }
737
738                        }
739
740                        0x4: decode FUNCTION_LO {
741                            0x0: FloatOp::cvt_s_pu({{ Fd.sf = Fs2.sf; }});
742                        }
743
744                        0x5: decode FUNCTION_LO {
745                            0x0: FloatOp::cvt_s_pl({{ Fd.sf = Fs1.sf; }});
746
747                            format Float64Op {
748                                0x4: pll({{ Fd.ud = (uint64_t) Fs1.uw << 32 |
749                                                    Ft1.uw;
750                                         }});
751                                0x5: plu({{ Fd.ud = (uint64_t) Fs1.uw << 32 |
752                                                    Ft2.uw;
753                                         }});
754                                0x6: pul({{ Fd.ud = (uint64_t) Fs2.uw << 32 |
755                                                    Ft1.uw;
756                                         }});
757                                0x7: puu({{ Fd.ud = (uint64_t) Fs2.uw << 32 |
758                                                    Ft2.uw;
759                                         }});
760                            }
761                        }
762
763                        0x6: decode FUNCTION_LO {
764                            format FloatPSCompareOp {
765                                0x0: c_f_ps({{ cond1 = 0; }}, {{ cond2 = 0; }},
766                                            UnorderedFalse);
767                                0x1: c_un_ps({{ cond1 = 0; }}, {{ cond2 = 0; }},
768                                             UnorderedTrue);
769                                0x2: c_eq_ps({{ cond1 = (Fs1.sf == Ft1.sf); }},
770                                             {{ cond2 = (Fs2.sf == Ft2.sf); }},
771                                             UnorderedFalse);
772                                0x3: c_ueq_ps({{ cond1 = (Fs1.sf == Ft1.sf); }},
773                                              {{ cond2 = (Fs2.sf == Ft2.sf); }},
774                                              UnorderedTrue);
775                                0x4: c_olt_ps({{ cond1 = (Fs1.sf < Ft1.sf); }},
776                                              {{ cond2 = (Fs2.sf < Ft2.sf); }},
777                                              UnorderedFalse);
778                                0x5: c_ult_ps({{ cond1 = (Fs.sf < Ft.sf); }},
779                                              {{ cond2 = (Fs2.sf < Ft2.sf); }},
780                                              UnorderedTrue);
781                                0x6: c_ole_ps({{ cond1 = (Fs.sf <= Ft.sf); }},
782                                              {{ cond2 = (Fs2.sf <= Ft2.sf); }},
783                                              UnorderedFalse);
784                                0x7: c_ule_ps({{ cond1 = (Fs1.sf <= Ft1.sf); }},
785                                              {{ cond2 = (Fs2.sf <= Ft2.sf); }},
786                                              UnorderedTrue);
787                            }
788                        }
789
790                        0x7: decode FUNCTION_LO {
791                            format FloatPSCompareOp {
792                                0x0: c_sf_ps({{ cond1 = 0; }}, {{ cond2 = 0; }},
793                                             UnorderedFalse, QnanException);
794                                0x1: c_ngle_ps({{ cond1 = 0; }},
795                                               {{ cond2 = 0; }},
796                                               UnorderedTrue, QnanException);
797                                0x2: c_seq_ps({{ cond1 = (Fs1.sf == Ft1.sf); }},
798                                              {{ cond2 = (Fs2.sf == Ft2.sf); }},
799                                              UnorderedFalse, QnanException);
800                                0x3: c_ngl_ps({{ cond1 = (Fs1.sf == Ft1.sf); }},
801                                              {{ cond2 = (Fs2.sf == Ft2.sf); }},
802                                              UnorderedTrue, QnanException);
803                                0x4: c_lt_ps({{ cond1 = (Fs1.sf < Ft1.sf); }},
804                                             {{ cond2 = (Fs2.sf < Ft2.sf); }},
805                                             UnorderedFalse, QnanException);
806                                0x5: c_nge_ps({{ cond1 = (Fs1.sf < Ft1.sf); }},
807                                              {{ cond2 = (Fs2.sf < Ft2.sf); }},
808                                              UnorderedTrue, QnanException);
809                                0x6: c_le_ps({{ cond1 = (Fs1.sf <= Ft1.sf); }},
810                                             {{ cond2 = (Fs2.sf <= Ft2.sf); }},
811                                             UnorderedFalse, QnanException);
812                                0x7: c_ngt_ps({{ cond1 = (Fs1.sf <= Ft1.sf); }},
813                                              {{ cond2 = (Fs2.sf <= Ft2.sf); }},
814                                              UnorderedTrue, QnanException);
815                            }
816                        }
817                    }
818                }
819            }
820        }
821
822        //Table A-19 MIPS32 COP2 Encoding of rs Field
823        0x2: decode RS_MSB {
824            format FailUnimpl {
825                0x0: decode RS_HI {
826                    0x0: decode RS_LO {
827                        0x0: mfc2();
828                        0x2: cfc2();
829                        0x3: mfhc2();
830                        0x4: mtc2();
831                        0x6: ctc2();
832                        0x7: mftc2();
833                    }
834
835                    0x1: decode ND {
836                        0x0: decode TF {
837                            0x0: bc2f();
838                            0x1: bc2t();
839                        }
840
841                        0x1: decode TF {
842                            0x0: bc2fl();
843                            0x1: bc2tl();
844                        }
845                    }
846                }
847            }
848        }
849
850        //Table A-20 MIPS64 COP1X Encoding of Function Field 1
851        //Note: "COP1X instructions are legal only if 64-bit floating point
852        //operations are enabled."
853        0x3: decode FUNCTION_HI {
854            0x0: decode FUNCTION_LO {
855                format LoadIndexedMemory {
856                    0x0: lwxc1({{ Ft.uw = Mem.uw;}});
857                    0x1: ldxc1({{ Ft.ud = Mem.ud;}});
858                    0x5: luxc1({{ Ft.uw = Mem.ud;}});
859                }
860            }
861
862            0x1: decode FUNCTION_LO {
863                format StoreIndexedMemory {
864                    0x0: swxc1({{ Mem.uw = Ft.uw;}});
865                    0x1: sdxc1({{ Mem.ud = Ft.ud;}});
866                    0x5: suxc1({{ Mem.ud = Ft.ud;}});
867                }
868
869                0x7: Prefetch::prefx({{ EA = Rs + Rt; }});
870            }
871
872            0x3: decode FUNCTION_LO {
873                0x6: Float64Op::alnv_ps({{ if (Rs<2:0> == 0) {
874                                               Fd.ud = Fs.ud;
875                                           } else if (Rs<2:0> == 4) {
876                                             #if BYTE_ORDER == BIG_ENDIAN
877                                               Fd.ud = Fs.ud<31:0> << 32 |
878                                                       Ft.ud<63:32>;
879                                             #elif BYTE_ORDER == LITTLE_ENDIAN
880                                               Fd.ud = Ft.ud<31:0> << 32 |
881                                                       Fs.ud<63:32>;
882                                             #endif
883                                           } else {
884                                               Fd.ud = Fd.ud;
885                                           }
886                                        }});
887            }
888
889            format FloatAccOp {
890                0x4: decode FUNCTION_LO {
891                    0x0: madd_s({{ Fd.sf = (Fs.sf * Ft.sf) + Fr.sf; }});
892                    0x1: madd_d({{ Fd.df = (Fs.df * Ft.df) + Fr.df; }});
893                    0x6: madd_ps({{
894                        Fd1.sf = (Fs1.df * Ft1.df) + Fr1.df;
895                        Fd2.sf = (Fs2.df * Ft2.df) + Fr2.df;
896                    }});
897                }
898
899                0x5: decode FUNCTION_LO {
900                    0x0: msub_s({{ Fd.sf = (Fs.sf * Ft.sf) - Fr.sf; }});
901                    0x1: msub_d({{ Fd.df = (Fs.df * Ft.df) - Fr.df; }});
902                    0x6: msub_ps({{
903                        Fd1.sf = (Fs1.df * Ft1.df) - Fr1.df;
904                        Fd2.sf = (Fs2.df * Ft2.df) - Fr2.df;
905                    }});
906                }
907
908                0x6: decode FUNCTION_LO {
909                    0x0: nmadd_s({{ Fd.sf = (-1 * Fs.sf * Ft.sf) - Fr.sf; }});
910                    0x1: nmadd_d({{ Fd.df = (-1 * Fs.df * Ft.df) + Fr.df; }});
911                    0x6: nmadd_ps({{
912                        Fd1.sf = -((Fs1.df * Ft1.df) + Fr1.df);
913                        Fd2.sf = -((Fs2.df * Ft2.df) + Fr2.df);
914                    }});
915                }
916
917                0x7: decode FUNCTION_LO {
918                    0x0: nmsub_s({{ Fd.sf = (-1 * Fs.sf * Ft.sf) - Fr.sf; }});
919                    0x1: nmsub_d({{ Fd.df = (-1 * Fs.df * Ft.df) - Fr.df; }});
920                    0x6: nmsub_ps({{
921                        Fd1.sf = -((Fs1.df * Ft1.df) - Fr1.df);
922                        Fd2.sf = -((Fs2.df * Ft2.df) - Fr2.df);
923                    }});
924                }
925
926            }
927        }
928
929        format Branch {
930            0x4: beql({{ cond = (Rs.sw == Rt.sw); }}, Likely);
931            0x5: bnel({{ cond = (Rs.sw != Rt.sw); }}, Likely);
932            0x6: blezl({{ cond = (Rs.sw <= 0); }}, Likely);
933            0x7: bgtzl({{ cond = (Rs.sw > 0); }}, Likely);
934        }
935    }
936
937    0x3: decode OPCODE_LO {
938        //Table A-5 MIPS32 SPECIAL2 Encoding of Function Field
939        0x4: decode FUNCTION_HI {
940            0x0: decode FUNCTION_LO {
941                0x2: IntOp::mul({{ int64_t temp1 = Rs.sd * Rt.sd;
942                                   Rd.sw = temp1<31:0>
943                                }});
944
945                format HiLoOp {
946                    0x0: madd({{ val = ((int64_t) HI << 32 | LO) +
947                                       (Rs.sd * Rt.sd);
948                              }});
949                    0x1: maddu({{ val = ((uint64_t) HI << 32 | LO) +
950                                        (Rs.ud * Rt.ud);
951                               }});
952                    0x4: msub({{ val = ((int64_t) HI << 32 | LO) -
953                                       (Rs.sd * Rt.sd);
954                              }});
955                    0x5: msubu({{ val = ((uint64_t) HI << 32 | LO) -
956                                        (Rs.ud * Rt.ud);
957                               }});
958                }
959            }
960
961            0x4: decode FUNCTION_LO {
962                format BasicOp {
963                    0x0: clz({{ int cnt = 32;
964                                for (int idx = 31; idx >= 0; idx--) {
965                                    if( Rs<idx:idx> == 1) {
966                                        cnt = 31 - idx;
967                                        break;
968                                    }
969                                }
970                                Rd.uw = cnt;
971                             }});
972                    0x1: clo({{ int cnt = 32;
973                                for (int idx = 31; idx >= 0; idx--) {
974                                    if( Rs<idx:idx> == 0) {
975                                        cnt = 31 - idx;
976                                        break;
977                                    }
978                                }
979                                Rd.uw = cnt;
980                             }});
981                }
982            }
983
984            0x7: decode FUNCTION_LO {
985                0x7: FailUnimpl::sdbbp();
986            }
987        }
988
989        //Table A-6 MIPS32 SPECIAL3 Encoding of Function Field for Release 2
990        //of the Architecture
991        0x7: decode FUNCTION_HI {
992            0x0: decode FUNCTION_LO {
993                format BasicOp {
994                    0x1: ext({{ Rt.uw = bits(Rs.uw, MSB+LSB, LSB); }});
995                    0x4: ins({{ Rt.uw = bits(Rt.uw, 31, MSB+1) << (MSB+1) |
996                                        bits(Rs.uw, MSB-LSB, 0) << LSB |
997                                        bits(Rt.uw, LSB-1, 0);
998                             }});
999                }
1000            }
1001
1002            0x1: decode FUNCTION_LO {
1003                format MipsMT {
1004                    0x0: fork();
1005                    0x1: yield();
1006                }
1007            }
1008
1009            //Table A-10 MIPS32 BSHFL Encoding of sa Field
1010            0x4: decode SA {
1011                format BasicOp {
1012                    0x02: wsbh({{ Rd.uw = Rt.uw<23:16> << 24 |
1013                                          Rt.uw<31:24> << 16 |
1014                                          Rt.uw<7:0>   << 8  |
1015                                          Rt.uw<15:8>;
1016                    }});
1017                    0x10: seb({{ Rd.sw = Rt.sw<7:0>}});
1018                    0x18: seh({{ Rd.sw = Rt.sw<15:0>}});
1019                }
1020            }
1021
1022            0x6: decode FUNCTION_LO {
1023                0x7: FailUnimpl::rdhwr();
1024            }
1025        }
1026    }
1027
1028    0x4: decode OPCODE_LO {
1029        format LoadMemory {
1030            0x0: lb({{ Rt.sw = Mem.sb; }});
1031            0x1: lh({{ Rt.sw = Mem.sh; }});
1032            0x3: lw({{ Rt.sw = Mem.sw; }});
1033            0x4: lbu({{ Rt.uw = Mem.ub; }});
1034            0x5: lhu({{ Rt.uw = Mem.uh; }});
1035        }
1036
1037        format LoadUnalignedMemory {
1038            0x2: lwl({{ uint32_t mem_shift = 24 - (8 * byte_offset);
1039                        Rt.uw = mem_word << mem_shift |
1040                                Rt.uw & mask(mem_shift);
1041                     }});
1042            0x6: lwr({{ uint32_t mem_shift = 8 * byte_offset;
1043                        Rt.uw = Rt.uw & (mask(mem_shift) << (32 - mem_shift)) |
1044                                mem_word >> mem_shift;
1045                     }});
1046        }
1047    }
1048
1049    0x5: decode OPCODE_LO {
1050        format StoreMemory {
1051            0x0: sb({{ Mem.ub = Rt<7:0>; }});
1052            0x1: sh({{ Mem.uh = Rt<15:0>; }});
1053            0x3: sw({{ Mem.uw = Rt<31:0>; }});
1054        }
1055
1056        format StoreUnalignedMemory {
1057            0x2: swl({{ uint32_t reg_shift = 24 - (8 * byte_offset);
1058                        uint32_t mem_shift = 32 - reg_shift;
1059                        mem_word = mem_word & (mask(reg_shift) << mem_shift) |
1060                                   Rt.uw >> reg_shift;
1061                     }});
1062            0x6: swr({{ uint32_t reg_shift = 8 * byte_offset;
1063                        mem_word = Rt.uw << reg_shift |
1064                                   mem_word & (mask(reg_shift));
1065                     }});
1066        }
1067
1068        0x7: FailUnimpl::cache();
1069    }
1070
1071    0x6: decode OPCODE_LO {
1072        format LoadMemory {
1073            0x0: ll({{ Rt.uw = Mem.uw; }}, mem_flags=LOCKED);
1074            0x1: lwc1({{ Ft.uw = Mem.uw; }});
1075            0x5: ldc1({{ Ft.ud = Mem.ud; }});
1076        }
1077
1078        0x3: Prefetch::pref();
1079    }
1080
1081
1082    0x7: decode OPCODE_LO {
1083        0x0: StoreCond::sc({{ Mem.uw = Rt.uw;}},
1084                           {{ uint64_t tmp = write_result;
1085                              Rt.uw = (tmp == 0 || tmp == 1) ? tmp : Rt.uw;
1086                           }}, mem_flags=LOCKED);
1087
1088        format StoreMemory {
1089            0x1: swc1({{ Mem.uw = Ft.uw; }});
1090            0x5: sdc1({{ Mem.ud = Ft.ud; }});
1091        }
1092    }
1093}
1094
1095
1096