aboutsummaryrefslogtreecommitdiff
path: root/target/mips/op_helper.c
blob: 89c7d4556a016d1e020cc65298dade249f349e77 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
/*
 *  MIPS emulation helpers for qemu.
 *
 *  Copyright (c) 2004-2005 Jocelyn Mayer
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "qemu/osdep.h"
#include "cpu.h"
#include "internal.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/memop.h"
#include "fpu_helper.h"

/*****************************************************************************/
/* Exceptions processing helpers */

void helper_raise_exception_err(CPUMIPSState *env, uint32_t exception,
                                int error_code)
{
    do_raise_exception_err(env, exception, error_code, 0);
}

void helper_raise_exception(CPUMIPSState *env, uint32_t exception)
{
    do_raise_exception(env, exception, GETPC());
}

void helper_raise_exception_debug(CPUMIPSState *env)
{
    do_raise_exception(env, EXCP_DEBUG, 0);
}

static void raise_exception(CPUMIPSState *env, uint32_t exception)
{
    do_raise_exception(env, exception, 0);
}

/* 64 bits arithmetic for 32 bits hosts */
static inline uint64_t get_HILO(CPUMIPSState *env)
{
    return ((uint64_t)(env->active_tc.HI[0]) << 32) |
           (uint32_t)env->active_tc.LO[0];
}

static inline target_ulong set_HIT0_LO(CPUMIPSState *env, uint64_t HILO)
{
    env->active_tc.LO[0] = (int32_t)(HILO & 0xFFFFFFFF);
    return env->active_tc.HI[0] = (int32_t)(HILO >> 32);
}

static inline target_ulong set_HI_LOT0(CPUMIPSState *env, uint64_t HILO)
{
    target_ulong tmp = env->active_tc.LO[0] = (int32_t)(HILO & 0xFFFFFFFF);
    env->active_tc.HI[0] = (int32_t)(HILO >> 32);
    return tmp;
}

/* Multiplication variants of the vr54xx. */
target_ulong helper_muls(CPUMIPSState *env, target_ulong arg1,
                         target_ulong arg2)
{
    return set_HI_LOT0(env, 0 - ((int64_t)(int32_t)arg1 *
                                 (int64_t)(int32_t)arg2));
}

target_ulong helper_mulsu(CPUMIPSState *env, target_ulong arg1,
                          target_ulong arg2)
{
    return set_HI_LOT0(env, 0 - (uint64_t)(uint32_t)arg1 *
                       (uint64_t)(uint32_t)arg2);
}

target_ulong helper_macc(CPUMIPSState *env, target_ulong arg1,
                         target_ulong arg2)
{
    return set_HI_LOT0(env, (int64_t)get_HILO(env) + (int64_t)(int32_t)arg1 *
                       (int64_t)(int32_t)arg2);
}

target_ulong helper_macchi(CPUMIPSState *env, target_ulong arg1,
                           target_ulong arg2)
{
    return set_HIT0_LO(env, (int64_t)get_HILO(env) + (int64_t)(int32_t)arg1 *
                       (int64_t)(int32_t)arg2);
}

target_ulong helper_maccu(CPUMIPSState *env, target_ulong arg1,
                          target_ulong arg2)
{
    return set_HI_LOT0(env, (uint64_t)get_HILO(env) +
                       (uint64_t)(uint32_t)arg1 * (uint64_t)(uint32_t)arg2);
}

target_ulong helper_macchiu(CPUMIPSState *env, target_ulong arg1,
                            target_ulong arg2)
{
    return set_HIT0_LO(env, (uint64_t)get_HILO(env) +
                       (uint64_t)(uint32_t)arg1 * (uint64_t)(uint32_t)arg2);
}

target_ulong helper_msac(CPUMIPSState *env, target_ulong arg1,
                         target_ulong arg2)
{
    return set_HI_LOT0(env, (int64_t)get_HILO(env) - (int64_t)(int32_t)arg1 *
                       (int64_t)(int32_t)arg2);
}

target_ulong helper_msachi(CPUMIPSState *env, target_ulong arg1,
                           target_ulong arg2)
{
    return set_HIT0_LO(env, (int64_t)get_HILO(env) - (int64_t)(int32_t)arg1 *
                       (int64_t)(int32_t)arg2);
}

target_ulong helper_msacu(CPUMIPSState *env, target_ulong arg1,
                          target_ulong arg2)
{
    return set_HI_LOT0(env, (uint64_t)get_HILO(env) -
                       (uint64_t)(uint32_t)arg1 * (uint64_t)(uint32_t)arg2);
}

target_ulong helper_msachiu(CPUMIPSState *env, target_ulong arg1,
                            target_ulong arg2)
{
    return set_HIT0_LO(env, (uint64_t)get_HILO(env) -
                       (uint64_t)(uint32_t)arg1 * (uint64_t)(uint32_t)arg2);
}

target_ulong helper_mulhi(CPUMIPSState *env, target_ulong arg1,
                          target_ulong arg2)
{
    return set_HIT0_LO(env, (int64_t)(int32_t)arg1 * (int64_t)(int32_t)arg2);
}

target_ulong helper_mulhiu(CPUMIPSState *env, target_ulong arg1,
                           target_ulong arg2)
{
    return set_HIT0_LO(env, (uint64_t)(uint32_t)arg1 *
                       (uint64_t)(uint32_t)arg2);
}

target_ulong helper_mulshi(CPUMIPSState *env, target_ulong arg1,
                           target_ulong arg2)
{
    return set_HIT0_LO(env, 0 - (int64_t)(int32_t)arg1 *
                       (int64_t)(int32_t)arg2);
}

target_ulong helper_mulshiu(CPUMIPSState *env, target_ulong arg1,
                            target_ulong arg2)
{
    return set_HIT0_LO(env, 0 - (uint64_t)(uint32_t)arg1 *
                       (uint64_t)(uint32_t)arg2);
}

static inline target_ulong bitswap(target_ulong v)
{
    v = ((v >> 1) & (target_ulong)0x5555555555555555ULL) |
              ((v & (target_ulong)0x5555555555555555ULL) << 1);
    v = ((v >> 2) & (target_ulong)0x3333333333333333ULL) |
              ((v & (target_ulong)0x3333333333333333ULL) << 2);
    v = ((v >> 4) & (target_ulong)0x0F0F0F0F0F0F0F0FULL) |
              ((v & (target_ulong)0x0F0F0F0F0F0F0F0FULL) << 4);
    return v;
}

#ifdef TARGET_MIPS64
target_ulong helper_dbitswap(target_ulong rt)
{
    return bitswap(rt);
}
#endif

target_ulong helper_bitswap(target_ulong rt)
{
    return (int32_t)bitswap(rt);
}

target_ulong helper_rotx(target_ulong rs, uint32_t shift, uint32_t shiftx,
                        uint32_t stripe)
{
    int i;
    uint64_t tmp0 = ((uint64_t)rs) << 32 | ((uint64_t)rs & 0xffffffff);
    uint64_t tmp1 = tmp0;
    for (i = 0; i <= 46; i++) {
        int s;
        if (i & 0x8) {
            s = shift;
        } else {
            s = shiftx;
        }

        if (stripe != 0 && !(i & 0x4)) {
            s = ~s;
        }
        if (s & 0x10) {
            if (tmp0 & (1LL << (i + 16))) {
                tmp1 |= 1LL << i;
            } else {
                tmp1 &= ~(1LL << i);
            }
        }
    }

    uint64_t tmp2 = tmp1;
    for (i = 0; i <= 38; i++) {
        int s;
        if (i & 0x4) {
            s = shift;
        } else {
            s = shiftx;
        }

        if (s & 0x8) {
            if (tmp1 & (1LL << (i + 8))) {
                tmp2 |= 1LL << i;
            } else {
                tmp2 &= ~(1LL << i);
            }
        }
    }

    uint64_t tmp3 = tmp2;
    for (i = 0; i <= 34; i++) {
        int s;
        if (i & 0x2) {
            s = shift;
        } else {
            s = shiftx;
        }
        if (s & 0x4) {
            if (tmp2 & (1LL << (i + 4))) {
                tmp3 |= 1LL << i;
            } else {
                tmp3 &= ~(1LL << i);
            }
        }
    }

    uint64_t tmp4 = tmp3;
    for (i = 0; i <= 32; i++) {
        int s;
        if (i & 0x1) {
            s = shift;
        } else {
            s = shiftx;
        }
        if (s & 0x2) {
            if (tmp3 & (1LL << (i + 2))) {
                tmp4 |= 1LL << i;
            } else {
                tmp4 &= ~(1LL << i);
            }
        }
    }

    uint64_t tmp5 = tmp4;
    for (i = 0; i <= 31; i++) {
        int s;
        s = shift;
        if (s & 0x1) {
            if (tmp4 & (1LL << (i + 1))) {
                tmp5 |= 1LL << i;
            } else {
                tmp5 &= ~(1LL << i);
            }
        }
    }

    return (int64_t)(int32_t)(uint32_t)tmp5;
}

#ifndef CONFIG_USER_ONLY

static inline hwaddr do_translate_address(CPUMIPSState *env,
                                                      target_ulong address,
                                                      int rw, uintptr_t retaddr)
{
    hwaddr paddr;
    CPUState *cs = env_cpu(env);

    paddr = cpu_mips_translate_address(env, address, rw);

    if (paddr == -1LL) {
        cpu_loop_exit_restore(cs, retaddr);
    } else {
        return paddr;
    }
}

#define HELPER_LD_ATOMIC(name, insn, almask, do_cast)                         \
target_ulong helper_##name(CPUMIPSState *env, target_ulong arg, int mem_idx)  \
{                                                                             \
    if (arg & almask) {                                                       \
        if (!(env->hflags & MIPS_HFLAG_DM)) {                                 \
            env->CP0_BadVAddr = arg;                                          \
        }                                                                     \
        do_raise_exception(env, EXCP_AdEL, GETPC());                          \
    }                                                                         \
    env->CP0_LLAddr = do_translate_address(env, arg, 0, GETPC());             \
    env->lladdr = arg;                                                        \
    env->llval = do_cast cpu_##insn##_mmuidx_ra(env, arg, mem_idx, GETPC());  \
    return env->llval;                                                        \
}
HELPER_LD_ATOMIC(ll, ldl, 0x3, (target_long)(int32_t))
#ifdef TARGET_MIPS64
HELPER_LD_ATOMIC(lld, ldq, 0x7, (target_ulong))
#endif
#undef HELPER_LD_ATOMIC
#endif

#ifdef TARGET_WORDS_BIGENDIAN
#define GET_LMASK(v) ((v) & 3)
#define GET_OFFSET(addr, offset) (addr + (offset))
#else
#define GET_LMASK(v) (((v) & 3) ^ 3)
#define GET_OFFSET(addr, offset) (addr - (offset))
#endif

void helper_swl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                int mem_idx)
{
    cpu_stb_mmuidx_ra(env, arg2, (uint8_t)(arg1 >> 24), mem_idx, GETPC());

    if (GET_LMASK(arg2) <= 2) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 1), (uint8_t)(arg1 >> 16),
                          mem_idx, GETPC());
    }

    if (GET_LMASK(arg2) <= 1) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 2), (uint8_t)(arg1 >> 8),
                          mem_idx, GETPC());
    }

    if (GET_LMASK(arg2) == 0) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 3), (uint8_t)arg1,
                          mem_idx, GETPC());
    }
}

void helper_swr(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                int mem_idx)
{
    cpu_stb_mmuidx_ra(env, arg2, (uint8_t)arg1, mem_idx, GETPC());

    if (GET_LMASK(arg2) >= 1) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -1), (uint8_t)(arg1 >> 8),
                          mem_idx, GETPC());
    }

    if (GET_LMASK(arg2) >= 2) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -2), (uint8_t)(arg1 >> 16),
                          mem_idx, GETPC());
    }

    if (GET_LMASK(arg2) == 3) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -3), (uint8_t)(arg1 >> 24),
                          mem_idx, GETPC());
    }
}

#if defined(TARGET_MIPS64)
/*
 * "half" load and stores.  We must do the memory access inline,
 * or fault handling won't work.
 */
#ifdef TARGET_WORDS_BIGENDIAN
#define GET_LMASK64(v) ((v) & 7)
#else
#define GET_LMASK64(v) (((v) & 7) ^ 7)
#endif

void helper_sdl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                int mem_idx)
{
    cpu_stb_mmuidx_ra(env, arg2, (uint8_t)(arg1 >> 56), mem_idx, GETPC());

    if (GET_LMASK64(arg2) <= 6) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 1), (uint8_t)(arg1 >> 48),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) <= 5) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 2), (uint8_t)(arg1 >> 40),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) <= 4) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 3), (uint8_t)(arg1 >> 32),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) <= 3) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 4), (uint8_t)(arg1 >> 24),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) <= 2) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 5), (uint8_t)(arg1 >> 16),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) <= 1) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 6), (uint8_t)(arg1 >> 8),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) <= 0) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 7), (uint8_t)arg1,
                          mem_idx, GETPC());
    }
}

void helper_sdr(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                int mem_idx)
{
    cpu_stb_mmuidx_ra(env, arg2, (uint8_t)arg1, mem_idx, GETPC());

    if (GET_LMASK64(arg2) >= 1) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -1), (uint8_t)(arg1 >> 8),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) >= 2) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -2), (uint8_t)(arg1 >> 16),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) >= 3) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -3), (uint8_t)(arg1 >> 24),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) >= 4) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -4), (uint8_t)(arg1 >> 32),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) >= 5) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -5), (uint8_t)(arg1 >> 40),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) >= 6) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -6), (uint8_t)(arg1 >> 48),
                          mem_idx, GETPC());
    }

    if (GET_LMASK64(arg2) == 7) {
        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -7), (uint8_t)(arg1 >> 56),
                          mem_idx, GETPC());
    }
}
#endif /* TARGET_MIPS64 */

static const int multiple_regs[] = { 16, 17, 18, 19, 20, 21, 22, 23, 30 };

void helper_lwm(CPUMIPSState *env, target_ulong addr, target_ulong reglist,
                uint32_t mem_idx)
{
    target_ulong base_reglist = reglist & 0xf;
    target_ulong do_r31 = reglist & 0x10;

    if (base_reglist > 0 && base_reglist <= ARRAY_SIZE(multiple_regs)) {
        target_ulong i;

        for (i = 0; i < base_reglist; i++) {
            env->active_tc.gpr[multiple_regs[i]] =
                (target_long)cpu_ldl_mmuidx_ra(env, addr, mem_idx, GETPC());
            addr += 4;
        }
    }

    if (do_r31) {
        env->active_tc.gpr[31] =
            (target_long)cpu_ldl_mmuidx_ra(env, addr, mem_idx, GETPC());
    }
}

void helper_swm(CPUMIPSState *env, target_ulong addr, target_ulong reglist,
                uint32_t mem_idx)
{
    target_ulong base_reglist = reglist & 0xf;
    target_ulong do_r31 = reglist & 0x10;

    if (base_reglist > 0 && base_reglist <= ARRAY_SIZE(multiple_regs)) {
        target_ulong i;

        for (i = 0; i < base_reglist; i++) {
            cpu_stw_mmuidx_ra(env, addr, env->active_tc.gpr[multiple_regs[i]],
                              mem_idx, GETPC());
            addr += 4;
        }
    }

    if (do_r31) {
        cpu_stw_mmuidx_ra(env, addr, env->active_tc.gpr[31], mem_idx, GETPC());
    }
}

#if defined(TARGET_MIPS64)
void helper_ldm(CPUMIPSState *env, target_ulong addr, target_ulong reglist,
                uint32_t mem_idx)
{
    target_ulong base_reglist = reglist & 0xf;
    target_ulong do_r31 = reglist & 0x10;

    if (base_reglist > 0 && base_reglist <= ARRAY_SIZE(multiple_regs)) {
        target_ulong i;

        for (i = 0; i < base_reglist; i++) {
            env->active_tc.gpr[multiple_regs[i]] =
                cpu_ldq_mmuidx_ra(env, addr, mem_idx, GETPC());
            addr += 8;
        }
    }

    if (do_r31) {
        env->active_tc.gpr[31] =
            cpu_ldq_mmuidx_ra(env, addr, mem_idx, GETPC());
    }
}

void helper_sdm(CPUMIPSState *env, target_ulong addr, target_ulong reglist,
                uint32_t mem_idx)
{
    target_ulong base_reglist = reglist & 0xf;
    target_ulong do_r31 = reglist & 0x10;

    if (base_reglist > 0 && base_reglist <= ARRAY_SIZE(multiple_regs)) {
        target_ulong i;

        for (i = 0; i < base_reglist; i++) {
            cpu_stq_mmuidx_ra(env, addr, env->active_tc.gpr[multiple_regs[i]],
                              mem_idx, GETPC());
            addr += 8;
        }
    }

    if (do_r31) {
        cpu_stq_mmuidx_ra(env, addr, env->active_tc.gpr[31], mem_idx, GETPC());
    }
}
#endif


void helper_fork(target_ulong arg1, target_ulong arg2)
{
    /*
     * arg1 = rt, arg2 = rs
     * TODO: store to TC register
     */
}

target_ulong helper_yield(CPUMIPSState *env, target_ulong arg)
{
    target_long arg1 = arg;

    if (arg1 < 0) {
        /* No scheduling policy implemented. */
        if (arg1 != -2) {
            if (env->CP0_VPEControl & (1 << CP0VPECo_YSI) &&
                env->active_tc.CP0_TCStatus & (1 << CP0TCSt_DT)) {
                env->CP0_VPEControl &= ~(0x7 << CP0VPECo_EXCPT);
                env->CP0_VPEControl |= 4 << CP0VPECo_EXCPT;
                do_raise_exception(env, EXCP_THREAD, GETPC());
            }
        }
    } else if (arg1 == 0) {
        if (0) {
            /* TODO: TC underflow */
            env->CP0_VPEControl &= ~(0x7 << CP0VPECo_EXCPT);
            do_raise_exception(env, EXCP_THREAD, GETPC());
        } else {
            /* TODO: Deallocate TC */
        }
    } else if (arg1 > 0) {
        /* Yield qualifier inputs not implemented. */
        env->CP0_VPEControl &= ~(0x7 << CP0VPECo_EXCPT);
        env->CP0_VPEControl |= 2 << CP0VPECo_EXCPT;
        do_raise_exception(env, EXCP_THREAD, GETPC());
    }
    return env->CP0_YQMask;
}

#ifndef CONFIG_USER_ONLY
/* TLB management */
static void r4k_mips_tlb_flush_extra(CPUMIPSState *env, int first)
{
    /* Discard entries from env->tlb[first] onwards.  */
    while (env->tlb->tlb_in_use > first) {
        r4k_invalidate_tlb(env, --env->tlb->tlb_in_use, 0);
    }
}

static inline uint64_t get_tlb_pfn_from_entrylo(uint64_t entrylo)
{
#if defined(TARGET_MIPS64)
    return extract64(entrylo, 6, 54);
#else
    return extract64(entrylo, 6, 24) | /* PFN */
           (extract64(entrylo, 32, 32) << 24); /* PFNX */
#endif
}

static void r4k_fill_tlb(CPUMIPSState *env, int idx)
{
    r4k_tlb_t *tlb;
    uint64_t mask = env->CP0_PageMask >> (TARGET_PAGE_BITS + 1);

    /* XXX: detect conflicting TLBs and raise a MCHECK exception when needed */
    tlb = &env->tlb->mmu.r4k.tlb[idx];
    if (env->CP0_EntryHi & (1 << CP0EnHi_EHINV)) {
        tlb->EHINV = 1;
        return;
    }
    tlb->EHINV = 0;
    tlb->VPN = env->CP0_EntryHi & (TARGET_PAGE_MASK << 1);
#if defined(TARGET_MIPS64)
    tlb->VPN &= env->SEGMask;
#endif
    tlb->ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask;
    tlb->MMID = env->CP0_MemoryMapID;
    tlb->PageMask = env->CP0_PageMask;
    tlb->G = env->CP0_EntryLo0 & env->CP0_EntryLo1 & 1;
    tlb->V0 = (env->CP0_EntryLo0 & 2) != 0;
    tlb->D0 = (env->CP0_EntryLo0 & 4) != 0;
    tlb->C0 = (env->CP0_EntryLo0 >> 3) & 0x7;
    tlb->XI0 = (env->CP0_EntryLo0 >> CP0EnLo_XI) & 1;
    tlb->RI0 = (env->CP0_EntryLo0 >> CP0EnLo_RI) & 1;
    tlb->PFN[0] = (get_tlb_pfn_from_entrylo(env->CP0_EntryLo0) & ~mask) << 12;
    tlb->V1 = (env->CP0_EntryLo1 & 2) != 0;
    tlb->D1 = (env->CP0_EntryLo1 & 4) != 0;
    tlb->C1 = (env->CP0_EntryLo1 >> 3) & 0x7;
    tlb->XI1 = (env->CP0_EntryLo1 >> CP0EnLo_XI) & 1;
    tlb->RI1 = (env->CP0_EntryLo1 >> CP0EnLo_RI) & 1;
    tlb->PFN[1] = (get_tlb_pfn_from_entrylo(env->CP0_EntryLo1) & ~mask) << 12;
}

void r4k_helper_tlbinv(CPUMIPSState *env)
{
    bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1);
    uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask;
    uint32_t MMID = env->CP0_MemoryMapID;
    uint32_t tlb_mmid;
    r4k_tlb_t *tlb;
    int idx;

    MMID = mi ? MMID : (uint32_t) ASID;
    for (idx = 0; idx < env->tlb->nb_tlb; idx++) {
        tlb = &env->tlb->mmu.r4k.tlb[idx];
        tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID;
        if (!tlb->G && tlb_mmid == MMID) {
            tlb->EHINV = 1;
        }
    }
    cpu_mips_tlb_flush(env);
}

void r4k_helper_tlbinvf(CPUMIPSState *env)
{
    int idx;

    for (idx = 0; idx < env->tlb->nb_tlb; idx++) {
        env->tlb->mmu.r4k.tlb[idx].EHINV = 1;
    }
    cpu_mips_tlb_flush(env);
}

void r4k_helper_tlbwi(CPUMIPSState *env)
{
    bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1);
    target_ulong VPN;
    uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask;
    uint32_t MMID = env->CP0_MemoryMapID;
    uint32_t tlb_mmid;
    bool EHINV, G, V0, D0, V1, D1, XI0, XI1, RI0, RI1;
    r4k_tlb_t *tlb;
    int idx;

    MMID = mi ? MMID : (uint32_t) ASID;

    idx = (env->CP0_Index & ~0x80000000) % env->tlb->nb_tlb;
    tlb = &env->tlb->mmu.r4k.tlb[idx];
    VPN = env->CP0_EntryHi & (TARGET_PAGE_MASK << 1);
#if defined(TARGET_MIPS64)
    VPN &= env->SEGMask;
#endif
    EHINV = (env->CP0_EntryHi & (1 << CP0EnHi_EHINV)) != 0;
    G = env->CP0_EntryLo0 & env->CP0_EntryLo1 & 1;
    V0 = (env->CP0_EntryLo0 & 2) != 0;
    D0 = (env->CP0_EntryLo0 & 4) != 0;
    XI0 = (env->CP0_EntryLo0 >> CP0EnLo_XI) &1;
    RI0 = (env->CP0_EntryLo0 >> CP0EnLo_RI) &1;
    V1 = (env->CP0_EntryLo1 & 2) != 0;
    D1 = (env->CP0_EntryLo1 & 4) != 0;
    XI1 = (env->CP0_EntryLo1 >> CP0EnLo_XI) &1;
    RI1 = (env->CP0_EntryLo1 >> CP0EnLo_RI) &1;

    tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID;
    /*
     * Discard cached TLB entries, unless tlbwi is just upgrading access
     * permissions on the current entry.
     */
    if (tlb->VPN != VPN || tlb_mmid != MMID || tlb->G != G ||
        (!tlb->EHINV && EHINV) ||
        (tlb->V0 && !V0) || (tlb->D0 && !D0) ||
        (!tlb->XI0 && XI0) || (!tlb->RI0 && RI0) ||
        (tlb->V1 && !V1) || (tlb->D1 && !D1) ||
        (!tlb->XI1 && XI1) || (!tlb->RI1 && RI1)) {
        r4k_mips_tlb_flush_extra(env, env->tlb->nb_tlb);
    }

    r4k_invalidate_tlb(env, idx, 0);
    r4k_fill_tlb(env, idx);
}

void r4k_helper_tlbwr(CPUMIPSState *env)
{
    int r = cpu_mips_get_random(env);

    r4k_invalidate_tlb(env, r, 1);
    r4k_fill_tlb(env, r);
}

void r4k_helper_tlbp(CPUMIPSState *env)
{
    bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1);
    r4k_tlb_t *tlb;
    target_ulong mask;
    target_ulong tag;
    target_ulong VPN;
    uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask;
    uint32_t MMID = env->CP0_MemoryMapID;
    uint32_t tlb_mmid;
    int i;

    MMID = mi ? MMID : (uint32_t) ASID;
    for (i = 0; i < env->tlb->nb_tlb; i++) {
        tlb = &env->tlb->mmu.r4k.tlb[i];
        /* 1k pages are not supported. */
        mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
        tag = env->CP0_EntryHi & ~mask;
        VPN = tlb->VPN & ~mask;
#if defined(TARGET_MIPS64)
        tag &= env->SEGMask;
#endif
        tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID;
        /* Check ASID/MMID, virtual page number & size */
        if ((tlb->G == 1 || tlb_mmid == MMID) && VPN == tag && !tlb->EHINV) {
            /* TLB match */
            env->CP0_Index = i;
            break;
        }
    }
    if (i == env->tlb->nb_tlb) {
        /* No match.  Discard any shadow entries, if any of them match.  */
        for (i = env->tlb->nb_tlb; i < env->tlb->tlb_in_use; i++) {
            tlb = &env->tlb->mmu.r4k.tlb[i];
            /* 1k pages are not supported. */
            mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
            tag = env->CP0_EntryHi & ~mask;
            VPN = tlb->VPN & ~mask;
#if defined(TARGET_MIPS64)
            tag &= env->SEGMask;
#endif
            tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID;
            /* Check ASID/MMID, virtual page number & size */
            if ((tlb->G == 1 || tlb_mmid == MMID) && VPN == tag) {
                r4k_mips_tlb_flush_extra(env, i);
                break;
            }
        }

        env->CP0_Index |= 0x80000000;
    }
}

static inline uint64_t get_entrylo_pfn_from_tlb(uint64_t tlb_pfn)
{
#if defined(TARGET_MIPS64)
    return tlb_pfn << 6;
#else
    return (extract64(tlb_pfn, 0, 24) << 6) | /* PFN */
           (extract64(tlb_pfn, 24, 32) << 32); /* PFNX */
#endif
}

void r4k_helper_tlbr(CPUMIPSState *env)
{
    bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1);
    uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask;
    uint32_t MMID = env->CP0_MemoryMapID;
    uint32_t tlb_mmid;
    r4k_tlb_t *tlb;
    int idx;

    MMID = mi ? MMID : (uint32_t) ASID;
    idx = (env->CP0_Index & ~0x80000000) % env->tlb->nb_tlb;
    tlb = &env->tlb->mmu.r4k.tlb[idx];

    tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID;
    /* If this will change the current ASID/MMID, flush qemu's TLB.  */
    if (MMID != tlb_mmid) {
        cpu_mips_tlb_flush(env);
    }

    r4k_mips_tlb_flush_extra(env, env->tlb->nb_tlb);

    if (tlb->EHINV) {
        env->CP0_EntryHi = 1 << CP0EnHi_EHINV;
        env->CP0_PageMask = 0;
        env->CP0_EntryLo0 = 0;
        env->CP0_EntryLo1 = 0;
    } else {
        env->CP0_EntryHi = mi ? tlb->VPN : tlb->VPN | tlb->ASID;
        env->CP0_MemoryMapID = tlb->MMID;
        env->CP0_PageMask = tlb->PageMask;
        env->CP0_EntryLo0 = tlb->G | (tlb->V0 << 1) | (tlb->D0 << 2) |
                        ((uint64_t)tlb->RI0 << CP0EnLo_RI) |
                        ((uint64_t)tlb->XI0 << CP0EnLo_XI) | (tlb->C0 << 3) |
                        get_entrylo_pfn_from_tlb(tlb->PFN[0] >> 12);
        env->CP0_EntryLo1 = tlb->G | (tlb->V1 << 1) | (tlb->D1 << 2) |
                        ((uint64_t)tlb->RI1 << CP0EnLo_RI) |
                        ((uint64_t)tlb->XI1 << CP0EnLo_XI) | (tlb->C1 << 3) |
                        get_entrylo_pfn_from_tlb(tlb->PFN[1] >> 12);
    }
}

void helper_tlbwi(CPUMIPSState *env)
{
    env->tlb->helper_tlbwi(env);
}

void helper_tlbwr(CPUMIPSState *env)
{
    env->tlb->helper_tlbwr(env);
}

void helper_tlbp(CPUMIPSState *env)
{
    env->tlb->helper_tlbp(env);
}

void helper_tlbr(CPUMIPSState *env)
{
    env->tlb->helper_tlbr(env);
}

void helper_tlbinv(CPUMIPSState *env)
{
    env->tlb->helper_tlbinv(env);
}

void helper_tlbinvf(CPUMIPSState *env)
{
    env->tlb->helper_tlbinvf(env);
}

static void global_invalidate_tlb(CPUMIPSState *env,
                           uint32_t invMsgVPN2,
                           uint8_t invMsgR,
                           uint32_t invMsgMMid,
                           bool invAll,
                           bool invVAMMid,
                           bool invMMid,
                           bool invVA)
{

    int idx;
    r4k_tlb_t *tlb;
    bool VAMatch;
    bool MMidMatch;

    for (idx = 0; idx < env->tlb->nb_tlb; idx++) {
        tlb = &env->tlb->mmu.r4k.tlb[idx];
        VAMatch =
            (((tlb->VPN & ~tlb->PageMask) == (invMsgVPN2 & ~tlb->PageMask))
#ifdef TARGET_MIPS64
            &&
            (extract64(env->CP0_EntryHi, 62, 2) == invMsgR)
#endif
            );
        MMidMatch = tlb->MMID == invMsgMMid;
        if ((invAll && (idx > env->CP0_Wired)) ||
            (VAMatch && invVAMMid && (tlb->G || MMidMatch)) ||
            (VAMatch && invVA) ||
            (MMidMatch && !(tlb->G) && invMMid)) {
            tlb->EHINV = 1;
        }
    }
    cpu_mips_tlb_flush(env);
}

void helper_ginvt(CPUMIPSState *env, target_ulong arg, uint32_t type)
{
    bool invAll = type == 0;
    bool invVA = type == 1;
    bool invMMid = type == 2;
    bool invVAMMid = type == 3;
    uint32_t invMsgVPN2 = arg & (TARGET_PAGE_MASK << 1);
    uint8_t invMsgR = 0;
    uint32_t invMsgMMid = env->CP0_MemoryMapID;
    CPUState *other_cs = first_cpu;

#ifdef TARGET_MIPS64
    invMsgR = extract64(arg, 62, 2);
#endif

    CPU_FOREACH(other_cs) {
        MIPSCPU *other_cpu = MIPS_CPU(other_cs);
        global_invalidate_tlb(&other_cpu->env, invMsgVPN2, invMsgR, invMsgMMid,
                              invAll, invVAMMid, invMMid, invVA);
    }
}

/* Specials */
target_ulong helper_di(CPUMIPSState *env)
{
    target_ulong t0 = env->CP0_Status;

    env->CP0_Status = t0 & ~(1 << CP0St_IE);
    return t0;
}

target_ulong helper_ei(CPUMIPSState *env)
{
    target_ulong t0 = env->CP0_Status;

    env->CP0_Status = t0 | (1 << CP0St_IE);
    return t0;
}

static void debug_pre_eret(CPUMIPSState *env)
{
    if (qemu_loglevel_mask(CPU_LOG_EXEC)) {
        qemu_log("ERET: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx,
                env->active_tc.PC, env->CP0_EPC);
        if (env->CP0_Status & (1 << CP0St_ERL)) {
            qemu_log(" ErrorEPC " TARGET_FMT_lx, env->CP0_ErrorEPC);
        }
        if (env->hflags & MIPS_HFLAG_DM) {
            qemu_log(" DEPC " TARGET_FMT_lx, env->CP0_DEPC);
        }
        qemu_log("\n");
    }
}

static void debug_post_eret(CPUMIPSState *env)
{
    if (qemu_loglevel_mask(CPU_LOG_EXEC)) {
        qemu_log("  =>  PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx,
                env->active_tc.PC, env->CP0_EPC);
        if (env->CP0_Status & (1 << CP0St_ERL)) {
            qemu_log(" ErrorEPC " TARGET_FMT_lx, env->CP0_ErrorEPC);
        }
        if (env->hflags & MIPS_HFLAG_DM) {
            qemu_log(" DEPC " TARGET_FMT_lx, env->CP0_DEPC);
        }
        switch (cpu_mmu_index(env, false)) {
        case 3:
            qemu_log(", ERL\n");
            break;
        case MIPS_HFLAG_UM:
            qemu_log(", UM\n");
            break;
        case MIPS_HFLAG_SM:
            qemu_log(", SM\n");
            break;
        case MIPS_HFLAG_KM:
            qemu_log("\n");
            break;
        default:
            cpu_abort(env_cpu(env), "Invalid MMU mode!\n");
            break;
        }
    }
}

static void set_pc(CPUMIPSState *env, target_ulong error_pc)
{
    env->active_tc.PC = error_pc & ~(target_ulong)1;
    if (error_pc & 1) {
        env->hflags |= MIPS_HFLAG_M16;
    } else {
        env->hflags &= ~(MIPS_HFLAG_M16);
    }
}

static inline void exception_return(CPUMIPSState *env)
{
    debug_pre_eret(env);
    if (env->CP0_Status & (1 << CP0St_ERL)) {
        set_pc(env, env->CP0_ErrorEPC);
        env->CP0_Status &= ~(1 << CP0St_ERL);
    } else {
        set_pc(env, env->CP0_EPC);
        env->CP0_Status &= ~(1 << CP0St_EXL);
    }
    compute_hflags(env);
    debug_post_eret(env);
}

void helper_eret(CPUMIPSState *env)
{
    exception_return(env);
    env->CP0_LLAddr = 1;
    env->lladdr = 1;
}

void helper_eretnc(CPUMIPSState *env)
{
    exception_return(env);
}

void helper_deret(CPUMIPSState *env)
{
    debug_pre_eret(env);

    env->hflags &= ~MIPS_HFLAG_DM;
    compute_hflags(env);

    set_pc(env, env->CP0_DEPC);

    debug_post_eret(env);
}
#endif /* !CONFIG_USER_ONLY */

static inline void check_hwrena(CPUMIPSState *env, int reg, uintptr_t pc)
{
    if ((env->hflags & MIPS_HFLAG_CP0) || (env->CP0_HWREna & (1 << reg))) {
        return;
    }
    do_raise_exception(env, EXCP_RI, pc);
}

target_ulong helper_rdhwr_cpunum(CPUMIPSState *env)
{
    check_hwrena(env, 0, GETPC());
    return env->CP0_EBase & 0x3ff;
}

target_ulong helper_rdhwr_synci_step(CPUMIPSState *env)
{
    check_hwrena(env, 1, GETPC());
    return env->SYNCI_Step;
}

target_ulong helper_rdhwr_cc(CPUMIPSState *env)
{
    check_hwrena(env, 2, GETPC());
#ifdef CONFIG_USER_ONLY
    return env->CP0_Count;
#else
    return (int32_t)cpu_mips_get_count(env);
#endif
}

target_ulong helper_rdhwr_ccres(CPUMIPSState *env)
{
    check_hwrena(env, 3, GETPC());
    return env->CCRes;
}

target_ulong helper_rdhwr_performance(CPUMIPSState *env)
{
    check_hwrena(env, 4, GETPC());
    return env->CP0_Performance0;
}

target_ulong helper_rdhwr_xnp(CPUMIPSState *env)
{
    check_hwrena(env, 5, GETPC());
    return (env->CP0_Config5 >> CP0C5_XNP) & 1;
}

void helper_pmon(CPUMIPSState *env, int function)
{
    function /= 2;
    switch (function) {
    case 2: /* TODO: char inbyte(int waitflag); */
        if (env->active_tc.gpr[4] == 0) {
            env->active_tc.gpr[2] = -1;
        }
        /* Fall through */
    case 11: /* TODO: char inbyte (void); */
        env->active_tc.gpr[2] = -1;
        break;
    case 3:
    case 12:
        printf("%c", (char)(env->active_tc.gpr[4] & 0xFF));
        break;
    case 17:
        break;
    case 158:
        {
            unsigned char *fmt = (void *)(uintptr_t)env->active_tc.gpr[4];
            printf("%s", fmt);
        }
        break;
    }
}

void helper_wait(CPUMIPSState *env)
{
    CPUState *cs = env_cpu(env);

    cs->halted = 1;
    cpu_reset_interrupt(cs, CPU_INTERRUPT_WAKE);
    /*
     * Last instruction in the block, PC was updated before
     * - no need to recover PC and icount.
     */
    raise_exception(env, EXCP_HLT);
}

#if !defined(CONFIG_USER_ONLY)

void mips_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
                                  MMUAccessType access_type,
                                  int mmu_idx, uintptr_t retaddr)
{
    MIPSCPU *cpu = MIPS_CPU(cs);
    CPUMIPSState *env = &cpu->env;
    int error_code = 0;
    int excp;

    if (!(env->hflags & MIPS_HFLAG_DM)) {
        env->CP0_BadVAddr = addr;
    }

    if (access_type == MMU_DATA_STORE) {
        excp = EXCP_AdES;
    } else {
        excp = EXCP_AdEL;
        if (access_type == MMU_INST_FETCH) {
            error_code |= EXCP_INST_NOTAVAIL;
        }
    }

    do_raise_exception_err(env, excp, error_code, retaddr);
}

void mips_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
                                    vaddr addr, unsigned size,
                                    MMUAccessType access_type,
                                    int mmu_idx, MemTxAttrs attrs,
                                    MemTxResult response, uintptr_t retaddr)
{
    MIPSCPU *cpu = MIPS_CPU(cs);
    CPUMIPSState *env = &cpu->env;

    if (access_type == MMU_INST_FETCH) {
        do_raise_exception(env, EXCP_IBE, retaddr);
    } else {
        do_raise_exception(env, EXCP_DBE, retaddr);
    }
}
#endif /* !CONFIG_USER_ONLY */

void helper_cache(CPUMIPSState *env, target_ulong addr, uint32_t op)
{
#ifndef CONFIG_USER_ONLY
    static const char *const type_name[] = {
        "Primary Instruction",
        "Primary Data or Unified Primary",
        "Tertiary",
        "Secondary"
    };
    uint32_t cache_type = extract32(op, 0, 2);
    uint32_t cache_operation = extract32(op, 2, 3);
    target_ulong index = addr & 0x1fffffff;

    switch (cache_operation) {
    case 0b010: /* Index Store Tag */
        memory_region_dispatch_write(env->itc_tag, index, env->CP0_TagLo,
                                     MO_64, MEMTXATTRS_UNSPECIFIED);
        break;
    case 0b001: /* Index Load Tag */
        memory_region_dispatch_read(env->itc_tag, index, &env->CP0_TagLo,
                                    MO_64, MEMTXATTRS_UNSPECIFIED);
        break;
    case 0b000: /* Index Invalidate */
    case 0b100: /* Hit Invalidate */
    case 0b110: /* Hit Writeback */
        /* no-op */
        break;
    default:
        qemu_log_mask(LOG_UNIMP, "cache operation:%u (type: %s cache)\n",
                      cache_operation, type_name[cache_type]);
        break;
    }
#endif
}