aboutsummaryrefslogtreecommitdiff
path: root/tcg/mips/tcg-target.c
blob: c08418c413d725a232258d871df1e06fa54f594d (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
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
/*
 * Tiny Code Generator for QEMU
 *
 * Copyright (c) 2008-2009 Arnaud Patard <arnaud.patard@rtp-net.org>
 * Copyright (c) 2009 Aurelien Jarno <aurelien@aurel32.net>
 * Based on i386/tcg-target.c - Copyright (c) 2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "tcg-be-ldst.h"

#ifdef HOST_WORDS_BIGENDIAN
# define MIPS_BE  1
#else
# define MIPS_BE  0
#endif

#define LO_OFF    (MIPS_BE * 4)
#define HI_OFF    (4 - LO_OFF)

#ifndef NDEBUG
static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
    "zero",
    "at",
    "v0",
    "v1",
    "a0",
    "a1",
    "a2",
    "a3",
    "t0",
    "t1",
    "t2",
    "t3",
    "t4",
    "t5",
    "t6",
    "t7",
    "s0",
    "s1",
    "s2",
    "s3",
    "s4",
    "s5",
    "s6",
    "s7",
    "t8",
    "t9",
    "k0",
    "k1",
    "gp",
    "sp",
    "s8",
    "ra",
};
#endif

#define TCG_TMP0  TCG_REG_AT
#define TCG_TMP1  TCG_REG_T9

/* check if we really need so many registers :P */
static const TCGReg tcg_target_reg_alloc_order[] = {
    /* Call saved registers.  */
    TCG_REG_S0,
    TCG_REG_S1,
    TCG_REG_S2,
    TCG_REG_S3,
    TCG_REG_S4,
    TCG_REG_S5,
    TCG_REG_S6,
    TCG_REG_S7,
    TCG_REG_S8,

    /* Call clobbered registers.  */
    TCG_REG_T0,
    TCG_REG_T1,
    TCG_REG_T2,
    TCG_REG_T3,
    TCG_REG_T4,
    TCG_REG_T5,
    TCG_REG_T6,
    TCG_REG_T7,
    TCG_REG_T8,
    TCG_REG_T9,
    TCG_REG_V1,
    TCG_REG_V0,

    /* Argument registers, opposite order of allocation.  */
    TCG_REG_A3,
    TCG_REG_A2,
    TCG_REG_A1,
    TCG_REG_A0,
};

static const TCGReg tcg_target_call_iarg_regs[4] = {
    TCG_REG_A0,
    TCG_REG_A1,
    TCG_REG_A2,
    TCG_REG_A3
};

static const TCGReg tcg_target_call_oarg_regs[2] = {
    TCG_REG_V0,
    TCG_REG_V1
};

static tcg_insn_unit *tb_ret_addr;

static inline uint32_t reloc_pc16_val(tcg_insn_unit *pc, tcg_insn_unit *target)
{
    /* Let the compiler perform the right-shift as part of the arithmetic.  */
    ptrdiff_t disp = target - (pc + 1);
    assert(disp == (int16_t)disp);
    return disp & 0xffff;
}

static inline void reloc_pc16(tcg_insn_unit *pc, tcg_insn_unit *target)
{
    *pc = deposit32(*pc, 0, 16, reloc_pc16_val(pc, target));
}

static inline uint32_t reloc_26_val(tcg_insn_unit *pc, tcg_insn_unit *target)
{
    assert((((uintptr_t)pc ^ (uintptr_t)target) & 0xf0000000) == 0);
    return ((uintptr_t)target >> 2) & 0x3ffffff;
}

static inline void reloc_26(tcg_insn_unit *pc, tcg_insn_unit *target)
{
    *pc = deposit32(*pc, 0, 26, reloc_26_val(pc, target));
}

static void patch_reloc(tcg_insn_unit *code_ptr, int type,
                        intptr_t value, intptr_t addend)
{
    assert(type == R_MIPS_PC16);
    assert(addend == 0);
    reloc_pc16(code_ptr, (tcg_insn_unit *)value);
}

#define TCG_CT_CONST_ZERO 0x100
#define TCG_CT_CONST_U16  0x200    /* Unsigned 16-bit: 0 - 0xffff.  */
#define TCG_CT_CONST_S16  0x400    /* Signed 16-bit: -32768 - 32767 */
#define TCG_CT_CONST_P2M1 0x800    /* Power of 2 minus 1.  */
#define TCG_CT_CONST_N16  0x1000   /* "Negatable" 16-bit: -32767 - 32767 */

static inline bool is_p2m1(tcg_target_long val)
{
    return val && ((val + 1) & val) == 0;
}

/* parse target specific constraints */
static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)
{
    const char *ct_str;

    ct_str = *pct_str;
    switch(ct_str[0]) {
    case 'r':
        ct->ct |= TCG_CT_REG;
        tcg_regset_set(ct->u.regs, 0xffffffff);
        break;
    case 'L': /* qemu_ld output arg constraint */
        ct->ct |= TCG_CT_REG;
        tcg_regset_set(ct->u.regs, 0xffffffff);
        tcg_regset_reset_reg(ct->u.regs, TCG_REG_V0);
        break;
    case 'l': /* qemu_ld input arg constraint */
        ct->ct |= TCG_CT_REG;
        tcg_regset_set(ct->u.regs, 0xffffffff);
        tcg_regset_reset_reg(ct->u.regs, TCG_REG_A0);
#if defined(CONFIG_SOFTMMU)
        if (TARGET_LONG_BITS == 64) {
            tcg_regset_reset_reg(ct->u.regs, TCG_REG_A2);
        }
#endif
        break;
    case 'S': /* qemu_st constraint */
        ct->ct |= TCG_CT_REG;
        tcg_regset_set(ct->u.regs, 0xffffffff);
        tcg_regset_reset_reg(ct->u.regs, TCG_REG_A0);
#if defined(CONFIG_SOFTMMU)
        if (TARGET_LONG_BITS == 32) {
            tcg_regset_reset_reg(ct->u.regs, TCG_REG_A1);
        } else {
            tcg_regset_reset_reg(ct->u.regs, TCG_REG_A2);
            tcg_regset_reset_reg(ct->u.regs, TCG_REG_A3);
        }
#endif
        break;
    case 'I':
        ct->ct |= TCG_CT_CONST_U16;
        break;
    case 'J':
        ct->ct |= TCG_CT_CONST_S16;
        break;
    case 'K':
        ct->ct |= TCG_CT_CONST_P2M1;
        break;
    case 'N':
        ct->ct |= TCG_CT_CONST_N16;
        break;
    case 'Z':
        /* We are cheating a bit here, using the fact that the register
           ZERO is also the register number 0. Hence there is no need
           to check for const_args in each instruction. */
        ct->ct |= TCG_CT_CONST_ZERO;
        break;
    default:
        return -1;
    }
    ct_str++;
    *pct_str = ct_str;
    return 0;
}

/* test if a constant matches the constraint */
static inline int tcg_target_const_match(tcg_target_long val, TCGType type,
                                         const TCGArgConstraint *arg_ct)
{
    int ct;
    ct = arg_ct->ct;
    if (ct & TCG_CT_CONST) {
        return 1;
    } else if ((ct & TCG_CT_CONST_ZERO) && val == 0) {
        return 1;
    } else if ((ct & TCG_CT_CONST_U16) && val == (uint16_t)val) {
        return 1;
    } else if ((ct & TCG_CT_CONST_S16) && val == (int16_t)val) {
        return 1;
    } else if ((ct & TCG_CT_CONST_N16) && val >= -32767 && val <= 32767) {
        return 1;
    } else if ((ct & TCG_CT_CONST_P2M1)
               && use_mips32r2_instructions && is_p2m1(val)) {
        return 1;
    }
    return 0;
}

/* instruction opcodes */
typedef enum {
    OPC_J        = 0x02 << 26,
    OPC_JAL      = 0x03 << 26,
    OPC_BEQ      = 0x04 << 26,
    OPC_BNE      = 0x05 << 26,
    OPC_BLEZ     = 0x06 << 26,
    OPC_BGTZ     = 0x07 << 26,
    OPC_ADDIU    = 0x09 << 26,
    OPC_SLTI     = 0x0A << 26,
    OPC_SLTIU    = 0x0B << 26,
    OPC_ANDI     = 0x0C << 26,
    OPC_ORI      = 0x0D << 26,
    OPC_XORI     = 0x0E << 26,
    OPC_LUI      = 0x0F << 26,
    OPC_LB       = 0x20 << 26,
    OPC_LH       = 0x21 << 26,
    OPC_LW       = 0x23 << 26,
    OPC_LBU      = 0x24 << 26,
    OPC_LHU      = 0x25 << 26,
    OPC_LWU      = 0x27 << 26,
    OPC_SB       = 0x28 << 26,
    OPC_SH       = 0x29 << 26,
    OPC_SW       = 0x2B << 26,

    OPC_SPECIAL  = 0x00 << 26,
    OPC_SLL      = OPC_SPECIAL | 0x00,
    OPC_SRL      = OPC_SPECIAL | 0x02,
    OPC_ROTR     = OPC_SPECIAL | (0x01 << 21) | 0x02,
    OPC_SRA      = OPC_SPECIAL | 0x03,
    OPC_SLLV     = OPC_SPECIAL | 0x04,
    OPC_SRLV     = OPC_SPECIAL | 0x06,
    OPC_ROTRV    = OPC_SPECIAL | (0x01 <<  6) | 0x06,
    OPC_SRAV     = OPC_SPECIAL | 0x07,
    OPC_JR_R5    = OPC_SPECIAL | 0x08,
    OPC_JALR     = OPC_SPECIAL | 0x09,
    OPC_MOVZ     = OPC_SPECIAL | 0x0A,
    OPC_MOVN     = OPC_SPECIAL | 0x0B,
    OPC_MFHI     = OPC_SPECIAL | 0x10,
    OPC_MFLO     = OPC_SPECIAL | 0x12,
    OPC_MULT     = OPC_SPECIAL | 0x18,
    OPC_MULTU    = OPC_SPECIAL | 0x19,
    OPC_DIV      = OPC_SPECIAL | 0x1A,
    OPC_DIVU     = OPC_SPECIAL | 0x1B,
    OPC_ADDU     = OPC_SPECIAL | 0x21,
    OPC_SUBU     = OPC_SPECIAL | 0x23,
    OPC_AND      = OPC_SPECIAL | 0x24,
    OPC_OR       = OPC_SPECIAL | 0x25,
    OPC_XOR      = OPC_SPECIAL | 0x26,
    OPC_NOR      = OPC_SPECIAL | 0x27,
    OPC_SLT      = OPC_SPECIAL | 0x2A,
    OPC_SLTU     = OPC_SPECIAL | 0x2B,

    OPC_REGIMM   = 0x01 << 26,
    OPC_BLTZ     = OPC_REGIMM | (0x00 << 16),
    OPC_BGEZ     = OPC_REGIMM | (0x01 << 16),

    OPC_SPECIAL2 = 0x1c << 26,
    OPC_MUL      = OPC_SPECIAL2 | 0x002,

    OPC_SPECIAL3 = 0x1f << 26,
    OPC_EXT      = OPC_SPECIAL3 | 0x000,
    OPC_INS      = OPC_SPECIAL3 | 0x004,
    OPC_WSBH     = OPC_SPECIAL3 | 0x0a0,
    OPC_SEB      = OPC_SPECIAL3 | 0x420,
    OPC_SEH      = OPC_SPECIAL3 | 0x620,

    /* MIPS r6 doesn't have JR, JALR should be used instead */
    OPC_JR       = use_mips32r6_instructions ? OPC_JALR : OPC_JR_R5,
} MIPSInsn;

/*
 * Type reg
 */
static inline void tcg_out_opc_reg(TCGContext *s, MIPSInsn opc,
                                   TCGReg rd, TCGReg rs, TCGReg rt)
{
    int32_t inst;

    inst = opc;
    inst |= (rs & 0x1F) << 21;
    inst |= (rt & 0x1F) << 16;
    inst |= (rd & 0x1F) << 11;
    tcg_out32(s, inst);
}

/*
 * Type immediate
 */
static inline void tcg_out_opc_imm(TCGContext *s, MIPSInsn opc,
                                   TCGReg rt, TCGReg rs, TCGArg imm)
{
    int32_t inst;

    inst = opc;
    inst |= (rs & 0x1F) << 21;
    inst |= (rt & 0x1F) << 16;
    inst |= (imm & 0xffff);
    tcg_out32(s, inst);
}

/*
 * Type bitfield
 */
static inline void tcg_out_opc_bf(TCGContext *s, MIPSInsn opc, TCGReg rt,
                                  TCGReg rs, int msb, int lsb)
{
    int32_t inst;

    inst = opc;
    inst |= (rs & 0x1F) << 21;
    inst |= (rt & 0x1F) << 16;
    inst |= (msb & 0x1F) << 11;
    inst |= (lsb & 0x1F) << 6;
    tcg_out32(s, inst);
}

/*
 * Type branch
 */
static inline void tcg_out_opc_br(TCGContext *s, MIPSInsn opc,
                                  TCGReg rt, TCGReg rs)
{
    /* We pay attention here to not modify the branch target by reading
       the existing value and using it again. This ensure that caches and
       memory are kept coherent during retranslation. */
    uint16_t offset = (uint16_t)*s->code_ptr;

    tcg_out_opc_imm(s, opc, rt, rs, offset);
}

/*
 * Type sa
 */
static inline void tcg_out_opc_sa(TCGContext *s, MIPSInsn opc,
                                  TCGReg rd, TCGReg rt, TCGArg sa)
{
    int32_t inst;

    inst = opc;
    inst |= (rt & 0x1F) << 16;
    inst |= (rd & 0x1F) << 11;
    inst |= (sa & 0x1F) <<  6;
    tcg_out32(s, inst);

}

/*
 * Type jump.
 * Returns true if the branch was in range and the insn was emitted.
 */
static bool tcg_out_opc_jmp(TCGContext *s, MIPSInsn opc, void *target)
{
    uintptr_t dest = (uintptr_t)target;
    uintptr_t from = (uintptr_t)s->code_ptr + 4;
    int32_t inst;

    /* The pc-region branch happens within the 256MB region of
       the delay slot (thus the +4).  */
    if ((from ^ dest) & -(1 << 28)) {
        return false;
    }
    assert((dest & 3) == 0);

    inst = opc;
    inst |= (dest >> 2) & 0x3ffffff;
    tcg_out32(s, inst);
    return true;
}

static inline void tcg_out_nop(TCGContext *s)
{
    tcg_out32(s, 0);
}

static inline void tcg_out_mov(TCGContext *s, TCGType type,
                               TCGReg ret, TCGReg arg)
{
    /* Simple reg-reg move, optimising out the 'do nothing' case */
    if (ret != arg) {
        tcg_out_opc_reg(s, OPC_ADDU, ret, arg, TCG_REG_ZERO);
    }
}

static inline void tcg_out_movi(TCGContext *s, TCGType type,
                                TCGReg reg, tcg_target_long arg)
{
    if (arg == (int16_t)arg) {
        tcg_out_opc_imm(s, OPC_ADDIU, reg, TCG_REG_ZERO, arg);
    } else if (arg == (uint16_t)arg) {
        tcg_out_opc_imm(s, OPC_ORI, reg, TCG_REG_ZERO, arg);
    } else {
        tcg_out_opc_imm(s, OPC_LUI, reg, TCG_REG_ZERO, arg >> 16);
        if (arg & 0xffff) {
            tcg_out_opc_imm(s, OPC_ORI, reg, reg, arg & 0xffff);
        }
    }
}

static inline void tcg_out_bswap16(TCGContext *s, TCGReg ret, TCGReg arg)
{
    if (use_mips32r2_instructions) {
        tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg);
    } else {
        /* ret and arg can't be register at */
        if (ret == TCG_TMP0 || arg == TCG_TMP0) {
            tcg_abort();
        }

        tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, arg, 8);
        tcg_out_opc_sa(s, OPC_SLL, ret, arg, 8);
        tcg_out_opc_imm(s, OPC_ANDI, ret, ret, 0xff00);
        tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0);
    }
}

static inline void tcg_out_bswap16s(TCGContext *s, TCGReg ret, TCGReg arg)
{
    if (use_mips32r2_instructions) {
        tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg);
        tcg_out_opc_reg(s, OPC_SEH, ret, 0, ret);
    } else {
        /* ret and arg can't be register at */
        if (ret == TCG_TMP0 || arg == TCG_TMP0) {
            tcg_abort();
        }

        tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, arg, 8);
        tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24);
        tcg_out_opc_sa(s, OPC_SRA, ret, ret, 16);
        tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0);
    }
}

static inline void tcg_out_bswap32(TCGContext *s, TCGReg ret, TCGReg arg)
{
    if (use_mips32r2_instructions) {
        tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg);
        tcg_out_opc_sa(s, OPC_ROTR, ret, ret, 16);
    } else {
        /* ret and arg must be different and can't be register at */
        if (ret == arg || ret == TCG_TMP0 || arg == TCG_TMP0) {
            tcg_abort();
        }

        tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24);

        tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, arg, 24);
        tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0);

        tcg_out_opc_imm(s, OPC_ANDI, TCG_TMP0, arg, 0xff00);
        tcg_out_opc_sa(s, OPC_SLL, TCG_TMP0, TCG_TMP0, 8);
        tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0);

        tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, arg, 8);
        tcg_out_opc_imm(s, OPC_ANDI, TCG_TMP0, TCG_TMP0, 0xff00);
        tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_TMP0);
    }
}

static inline void tcg_out_ext8s(TCGContext *s, TCGReg ret, TCGReg arg)
{
    if (use_mips32r2_instructions) {
        tcg_out_opc_reg(s, OPC_SEB, ret, 0, arg);
    } else {
        tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24);
        tcg_out_opc_sa(s, OPC_SRA, ret, ret, 24);
    }
}

static inline void tcg_out_ext16s(TCGContext *s, TCGReg ret, TCGReg arg)
{
    if (use_mips32r2_instructions) {
        tcg_out_opc_reg(s, OPC_SEH, ret, 0, arg);
    } else {
        tcg_out_opc_sa(s, OPC_SLL, ret, arg, 16);
        tcg_out_opc_sa(s, OPC_SRA, ret, ret, 16);
    }
}

static void tcg_out_ldst(TCGContext *s, MIPSInsn opc, TCGReg data,
                         TCGReg addr, intptr_t ofs)
{
    int16_t lo = ofs;
    if (ofs != lo) {
        tcg_out_movi(s, TCG_TYPE_PTR, TCG_TMP0, ofs - lo);
        if (addr != TCG_REG_ZERO) {
            tcg_out_opc_reg(s, OPC_ADDU, TCG_TMP0, TCG_TMP0, addr);
        }
        addr = TCG_TMP0;
    }
    tcg_out_opc_imm(s, opc, data, addr, lo);
}

static inline void tcg_out_ld(TCGContext *s, TCGType type, TCGReg arg,
                              TCGReg arg1, intptr_t arg2)
{
    tcg_out_ldst(s, OPC_LW, arg, arg1, arg2);
}

static inline void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
                              TCGReg arg1, intptr_t arg2)
{
    tcg_out_ldst(s, OPC_SW, arg, arg1, arg2);
}

static inline void tcg_out_addi(TCGContext *s, TCGReg reg, TCGArg val)
{
    if (val == (int16_t)val) {
        tcg_out_opc_imm(s, OPC_ADDIU, reg, reg, val);
    } else {
        tcg_out_movi(s, TCG_TYPE_PTR, TCG_TMP0, val);
        tcg_out_opc_reg(s, OPC_ADDU, reg, reg, TCG_TMP0);
    }
}

static void tcg_out_addsub2(TCGContext *s, TCGReg rl, TCGReg rh, TCGReg al,
                            TCGReg ah, TCGArg bl, TCGArg bh, bool cbl,
                            bool cbh, bool is_sub)
{
    TCGReg th = TCG_TMP1;

    /* If we have a negative constant such that negating it would
       make the high part zero, we can (usually) eliminate one insn.  */
    if (cbl && cbh && bh == -1 && bl != 0) {
        bl = -bl;
        bh = 0;
        is_sub = !is_sub;
    }

    /* By operating on the high part first, we get to use the final
       carry operation to move back from the temporary.  */
    if (!cbh) {
        tcg_out_opc_reg(s, (is_sub ? OPC_SUBU : OPC_ADDU), th, ah, bh);
    } else if (bh != 0 || ah == rl) {
        tcg_out_opc_imm(s, OPC_ADDIU, th, ah, (is_sub ? -bh : bh));
    } else {
        th = ah;
    }

    /* Note that tcg optimization should eliminate the bl == 0 case.  */
    if (is_sub) {
        if (cbl) {
            tcg_out_opc_imm(s, OPC_SLTIU, TCG_TMP0, al, bl);
            tcg_out_opc_imm(s, OPC_ADDIU, rl, al, -bl);
        } else {
            tcg_out_opc_reg(s, OPC_SLTU, TCG_TMP0, al, bl);
            tcg_out_opc_reg(s, OPC_SUBU, rl, al, bl);
        }
        tcg_out_opc_reg(s, OPC_SUBU, rh, th, TCG_TMP0);
    } else {
        if (cbl) {
            tcg_out_opc_imm(s, OPC_ADDIU, rl, al, bl);
            tcg_out_opc_imm(s, OPC_SLTIU, TCG_TMP0, rl, bl);
        } else if (rl == al && rl == bl) {
            tcg_out_opc_sa(s, OPC_SRL, TCG_TMP0, al, 31);
            tcg_out_opc_reg(s, OPC_ADDU, rl, al, bl);
        } else {
            tcg_out_opc_reg(s, OPC_ADDU, rl, al, bl);
            tcg_out_opc_reg(s, OPC_SLTU, TCG_TMP0, rl, (rl == bl ? al : bl));
        }
        tcg_out_opc_reg(s, OPC_ADDU, rh, th, TCG_TMP0);
    }
}

/* Bit 0 set if inversion required; bit 1 set if swapping required.  */
#define MIPS_CMP_INV  1
#define MIPS_CMP_SWAP 2

static const uint8_t mips_cmp_map[16] = {
    [TCG_COND_LT]  = 0,
    [TCG_COND_LTU] = 0,
    [TCG_COND_GE]  = MIPS_CMP_INV,
    [TCG_COND_GEU] = MIPS_CMP_INV,
    [TCG_COND_LE]  = MIPS_CMP_INV | MIPS_CMP_SWAP,
    [TCG_COND_LEU] = MIPS_CMP_INV | MIPS_CMP_SWAP,
    [TCG_COND_GT]  = MIPS_CMP_SWAP,
    [TCG_COND_GTU] = MIPS_CMP_SWAP,
};

static void tcg_out_setcond(TCGContext *s, TCGCond cond, TCGReg ret,
                            TCGReg arg1, TCGReg arg2)
{
    MIPSInsn s_opc = OPC_SLTU;
    int cmp_map;

    switch (cond) {
    case TCG_COND_EQ:
        if (arg2 != 0) {
            tcg_out_opc_reg(s, OPC_XOR, ret, arg1, arg2);
            arg1 = ret;
        }
        tcg_out_opc_imm(s, OPC_SLTIU, ret, arg1, 1);
        break;

    case TCG_COND_NE:
        if (arg2 != 0) {
            tcg_out_opc_reg(s, OPC_XOR, ret, arg1, arg2);
            arg1 = ret;
        }
        tcg_out_opc_reg(s, OPC_SLTU, ret, TCG_REG_ZERO, arg1);
        break;

    case TCG_COND_LT:
    case TCG_COND_GE:
    case TCG_COND_LE:
    case TCG_COND_GT:
        s_opc = OPC_SLT;
        /* FALLTHRU */

    case TCG_COND_LTU:
    case TCG_COND_GEU:
    case TCG_COND_LEU:
    case TCG_COND_GTU:
        cmp_map = mips_cmp_map[cond];
        if (cmp_map & MIPS_CMP_SWAP) {
            TCGReg t = arg1;
            arg1 = arg2;
            arg2 = t;
        }
        tcg_out_opc_reg(s, s_opc, ret, arg1, arg2);
        if (cmp_map & MIPS_CMP_INV) {
            tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1);
        }
        break;

     default:
         tcg_abort();
         break;
     }
}

static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1,
                           TCGReg arg2, TCGLabel *l)
{
    static const MIPSInsn b_zero[16] = {
        [TCG_COND_LT] = OPC_BLTZ,
        [TCG_COND_GT] = OPC_BGTZ,
        [TCG_COND_LE] = OPC_BLEZ,
        [TCG_COND_GE] = OPC_BGEZ,
    };

    MIPSInsn s_opc = OPC_SLTU;
    MIPSInsn b_opc;
    int cmp_map;

    switch (cond) {
    case TCG_COND_EQ:
        b_opc = OPC_BEQ;
        break;
    case TCG_COND_NE:
        b_opc = OPC_BNE;
        break;

    case TCG_COND_LT:
    case TCG_COND_GT:
    case TCG_COND_LE:
    case TCG_COND_GE:
        if (arg2 == 0) {
            b_opc = b_zero[cond];
            arg2 = arg1;
            arg1 = 0;
            break;
        }
        s_opc = OPC_SLT;
        /* FALLTHRU */

    case TCG_COND_LTU:
    case TCG_COND_GTU:
    case TCG_COND_LEU:
    case TCG_COND_GEU:
        cmp_map = mips_cmp_map[cond];
        if (cmp_map & MIPS_CMP_SWAP) {
            TCGReg t = arg1;
            arg1 = arg2;
            arg2 = t;
        }
        tcg_out_opc_reg(s, s_opc, TCG_TMP0, arg1, arg2);
        b_opc = (cmp_map & MIPS_CMP_INV ? OPC_BEQ : OPC_BNE);
        arg1 = TCG_TMP0;
        arg2 = TCG_REG_ZERO;
        break;

    default:
        tcg_abort();
        break;
    }

    tcg_out_opc_br(s, b_opc, arg1, arg2);
    if (l->has_value) {
        reloc_pc16(s->code_ptr - 1, l->u.value_ptr);
    } else {
        tcg_out_reloc(s, s->code_ptr - 1, R_MIPS_PC16, l, 0);
    }
    tcg_out_nop(s);
}

static TCGReg tcg_out_reduce_eq2(TCGContext *s, TCGReg tmp0, TCGReg tmp1,
                                 TCGReg al, TCGReg ah,
                                 TCGReg bl, TCGReg bh)
{
    /* Merge highpart comparison into AH.  */
    if (bh != 0) {
        if (ah != 0) {
            tcg_out_opc_reg(s, OPC_XOR, tmp0, ah, bh);
            ah = tmp0;
        } else {
            ah = bh;
        }
    }
    /* Merge lowpart comparison into AL.  */
    if (bl != 0) {
        if (al != 0) {
            tcg_out_opc_reg(s, OPC_XOR, tmp1, al, bl);
            al = tmp1;
        } else {
            al = bl;
        }
    }
    /* Merge high and low part comparisons into AL.  */
    if (ah != 0) {
        if (al != 0) {
            tcg_out_opc_reg(s, OPC_OR, tmp0, ah, al);
            al = tmp0;
        } else {
            al = ah;
        }
    }
    return al;
}

static void tcg_out_setcond2(TCGContext *s, TCGCond cond, TCGReg ret,
                             TCGReg al, TCGReg ah, TCGReg bl, TCGReg bh)
{
    TCGReg tmp0 = TCG_TMP0;
    TCGReg tmp1 = ret;

    assert(ret != TCG_TMP0);
    if (ret == ah || ret == bh) {
        assert(ret != TCG_TMP1);
        tmp1 = TCG_TMP1;
    }

    switch (cond) {
    case TCG_COND_EQ:
    case TCG_COND_NE:
        tmp1 = tcg_out_reduce_eq2(s, tmp0, tmp1, al, ah, bl, bh);
        tcg_out_setcond(s, cond, ret, tmp1, TCG_REG_ZERO);
        break;

    default:
        tcg_out_setcond(s, TCG_COND_EQ, tmp0, ah, bh);
        tcg_out_setcond(s, tcg_unsigned_cond(cond), tmp1, al, bl);
        tcg_out_opc_reg(s, OPC_AND, tmp1, tmp1, tmp0);
        tcg_out_setcond(s, tcg_high_cond(cond), tmp0, ah, bh);
        tcg_out_opc_reg(s, OPC_OR, ret, tmp1, tmp0);
        break;
    }
}

static void tcg_out_brcond2(TCGContext *s, TCGCond cond, TCGReg al, TCGReg ah,
                            TCGReg bl, TCGReg bh, TCGLabel *l)
{
    TCGCond b_cond = TCG_COND_NE;
    TCGReg tmp = TCG_TMP1;

    /* With branches, we emit between 4 and 9 insns with 2 or 3 branches.
       With setcond, we emit between 3 and 10 insns and only 1 branch,
       which ought to get better branch prediction.  */
     switch (cond) {
     case TCG_COND_EQ:
     case TCG_COND_NE:
        b_cond = cond;
        tmp = tcg_out_reduce_eq2(s, TCG_TMP0, TCG_TMP1, al, ah, bl, bh);
        break;

    default:
        /* Minimize code size by preferring a compare not requiring INV.  */
        if (mips_cmp_map[cond] & MIPS_CMP_INV) {
            cond = tcg_invert_cond(cond);
            b_cond = TCG_COND_EQ;
        }
        tcg_out_setcond2(s, cond, tmp, al, ah, bl, bh);
        break;
    }

    tcg_out_brcond(s, b_cond, tmp, TCG_REG_ZERO, l);
}

static void tcg_out_movcond(TCGContext *s, TCGCond cond, TCGReg ret,
                            TCGReg c1, TCGReg c2, TCGReg v)
{
    MIPSInsn m_opc = OPC_MOVN;

    switch (cond) {
    case TCG_COND_EQ:
        m_opc = OPC_MOVZ;
        /* FALLTHRU */
    case TCG_COND_NE:
        if (c2 != 0) {
            tcg_out_opc_reg(s, OPC_XOR, TCG_TMP0, c1, c2);
            c1 = TCG_TMP0;
        }
        break;

    default:
        /* Minimize code size by preferring a compare not requiring INV.  */
        if (mips_cmp_map[cond] & MIPS_CMP_INV) {
            cond = tcg_invert_cond(cond);
            m_opc = OPC_MOVZ;
        }
        tcg_out_setcond(s, cond, TCG_TMP0, c1, c2);
        c1 = TCG_TMP0;
        break;
    }

    tcg_out_opc_reg(s, m_opc, ret, v, c1);
}

static void tcg_out_call_int(TCGContext *s, tcg_insn_unit *arg, bool tail)
{
    /* Note that the ABI requires the called function's address to be
       loaded into T9, even if a direct branch is in range.  */
    tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_T9, (uintptr_t)arg);

    /* But do try a direct branch, allowing the cpu better insn prefetch.  */
    if (tail) {
        if (!tcg_out_opc_jmp(s, OPC_J, arg)) {
            tcg_out_opc_reg(s, OPC_JR, 0, TCG_REG_T9, 0);
        }
    } else {
        if (!tcg_out_opc_jmp(s, OPC_JAL, arg)) {
            tcg_out_opc_reg(s, OPC_JALR, TCG_REG_RA, TCG_REG_T9, 0);
        }
    }
}

static void tcg_out_call(TCGContext *s, tcg_insn_unit *arg)
{
    tcg_out_call_int(s, arg, false);
    tcg_out_nop(s);
}

#if defined(CONFIG_SOFTMMU)
static void * const qemu_ld_helpers[16] = {
    [MO_UB]   = helper_ret_ldub_mmu,
    [MO_SB]   = helper_ret_ldsb_mmu,
    [MO_LEUW] = helper_le_lduw_mmu,
    [MO_LESW] = helper_le_ldsw_mmu,
    [MO_LEUL] = helper_le_ldul_mmu,
    [MO_LEQ]  = helper_le_ldq_mmu,
    [MO_BEUW] = helper_be_lduw_mmu,
    [MO_BESW] = helper_be_ldsw_mmu,
    [MO_BEUL] = helper_be_ldul_mmu,
    [MO_BEQ]  = helper_be_ldq_mmu,
};

static void * const qemu_st_helpers[16] = {
    [MO_UB]   = helper_ret_stb_mmu,
    [MO_LEUW] = helper_le_stw_mmu,
    [MO_LEUL] = helper_le_stl_mmu,
    [MO_LEQ]  = helper_le_stq_mmu,
    [MO_BEUW] = helper_be_stw_mmu,
    [MO_BEUL] = helper_be_stl_mmu,
    [MO_BEQ]  = helper_be_stq_mmu,
};

/* Helper routines for marshalling helper function arguments into
 * the correct registers and stack.
 * I is where we want to put this argument, and is updated and returned
 * for the next call. ARG is the argument itself.
 *
 * We provide routines for arguments which are: immediate, 32 bit
 * value in register, 16 and 8 bit values in register (which must be zero
 * extended before use) and 64 bit value in a lo:hi register pair.
 */

static int tcg_out_call_iarg_reg(TCGContext *s, int i, TCGReg arg)
{
    if (i < ARRAY_SIZE(tcg_target_call_iarg_regs)) {
        tcg_out_mov(s, TCG_TYPE_REG, tcg_target_call_iarg_regs[i], arg);
    } else {
        tcg_out_st(s, TCG_TYPE_REG, arg, TCG_REG_SP, 4 * i);
    }
    return i + 1;
}

static int tcg_out_call_iarg_reg8(TCGContext *s, int i, TCGReg arg)
{
    TCGReg tmp = TCG_TMP0;
    if (i < ARRAY_SIZE(tcg_target_call_iarg_regs)) {
        tmp = tcg_target_call_iarg_regs[i];
    }
    tcg_out_opc_imm(s, OPC_ANDI, tmp, arg, 0xff);
    return tcg_out_call_iarg_reg(s, i, tmp);
}

static int tcg_out_call_iarg_reg16(TCGContext *s, int i, TCGReg arg)
{
    TCGReg tmp = TCG_TMP0;
    if (i < ARRAY_SIZE(tcg_target_call_iarg_regs)) {
        tmp = tcg_target_call_iarg_regs[i];
    }
    tcg_out_opc_imm(s, OPC_ANDI, tmp, arg, 0xffff);
    return tcg_out_call_iarg_reg(s, i, tmp);
}

static int tcg_out_call_iarg_imm(TCGContext *s, int i, TCGArg arg)
{
    TCGReg tmp = TCG_TMP0;
    if (arg == 0) {
        tmp = TCG_REG_ZERO;
    } else {
        if (i < ARRAY_SIZE(tcg_target_call_iarg_regs)) {
            tmp = tcg_target_call_iarg_regs[i];
        }
        tcg_out_movi(s, TCG_TYPE_REG, tmp, arg);
    }
    return tcg_out_call_iarg_reg(s, i, tmp);
}

static int tcg_out_call_iarg_reg2(TCGContext *s, int i, TCGReg al, TCGReg ah)
{
    i = (i + 1) & ~1;
    i = tcg_out_call_iarg_reg(s, i, (MIPS_BE ? ah : al));
    i = tcg_out_call_iarg_reg(s, i, (MIPS_BE ? al : ah));
    return i;
}

/* Perform the tlb comparison operation.  The complete host address is
   placed in BASE.  Clobbers AT, T0, A0.  */
static void tcg_out_tlb_load(TCGContext *s, TCGReg base, TCGReg addrl,
                             TCGReg addrh, TCGMemOpIdx oi,
                             tcg_insn_unit *label_ptr[2], bool is_load)
{
    TCGMemOp s_bits = get_memop(oi) & MO_SIZE;
    int mem_index = get_mmuidx(oi);
    int cmp_off
        = (is_load
           ? offsetof(CPUArchState, tlb_table[mem_index][0].addr_read)
           : offsetof(CPUArchState, tlb_table[mem_index][0].addr_write));
    int add_off = offsetof(CPUArchState, tlb_table[mem_index][0].addend);

    tcg_out_opc_sa(s, OPC_SRL, TCG_REG_A0, addrl,
                   TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
    tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_A0, TCG_REG_A0,
                    (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS);
    tcg_out_opc_reg(s, OPC_ADDU, TCG_REG_A0, TCG_REG_A0, TCG_AREG0);

    /* Compensate for very large offsets.  */
    if (add_off >= 0x8000) {
        /* Most target env are smaller than 32k; none are larger than 64k.
           Simplify the logic here merely to offset by 0x7ff0, giving us a
           range just shy of 64k.  Check this assumption.  */
        QEMU_BUILD_BUG_ON(offsetof(CPUArchState,
                                   tlb_table[NB_MMU_MODES - 1][1])
                          > 0x7ff0 + 0x7fff);
        tcg_out_opc_imm(s, OPC_ADDIU, TCG_REG_A0, TCG_REG_A0, 0x7ff0);
        cmp_off -= 0x7ff0;
        add_off -= 0x7ff0;
    }

    /* Load the (low half) tlb comparator.  */
    tcg_out_opc_imm(s, OPC_LW, TCG_TMP0, TCG_REG_A0,
                    cmp_off + (TARGET_LONG_BITS == 64 ? LO_OFF : 0));

    /* Mask the page bits, keeping the alignment bits to compare against.
       In between on 32-bit targets, load the tlb addend for the fast path.  */
    tcg_out_movi(s, TCG_TYPE_I32, TCG_TMP1,
                 TARGET_PAGE_MASK | ((1 << s_bits) - 1));
    if (TARGET_LONG_BITS == 32) {
        tcg_out_opc_imm(s, OPC_LW, TCG_REG_A0, TCG_REG_A0, add_off);
    }
    tcg_out_opc_reg(s, OPC_AND, TCG_TMP1, TCG_TMP1, addrl);

    label_ptr[0] = s->code_ptr;
    tcg_out_opc_br(s, OPC_BNE, TCG_TMP1, TCG_TMP0);

    /* Load and test the high half tlb comparator.  */
    if (TARGET_LONG_BITS == 64) {
        /* delay slot */
        tcg_out_opc_imm(s, OPC_LW, TCG_TMP0, TCG_REG_A0, cmp_off + HI_OFF);

        /* Load the tlb addend for the fast path. We can't do it earlier with
           64-bit targets or we'll clobber a0 before reading the high half tlb
           comparator.  */
        tcg_out_opc_imm(s, OPC_LW, TCG_REG_A0, TCG_REG_A0, add_off);

        label_ptr[1] = s->code_ptr;
        tcg_out_opc_br(s, OPC_BNE, addrh, TCG_TMP0);
    }

    /* delay slot */
    tcg_out_opc_reg(s, OPC_ADDU, base, TCG_REG_A0, addrl);
}

static void add_qemu_ldst_label(TCGContext *s, int is_ld, TCGMemOpIdx oi,
                                TCGReg datalo, TCGReg datahi,
                                TCGReg addrlo, TCGReg addrhi,
                                void *raddr, tcg_insn_unit *label_ptr[2])
{
    TCGLabelQemuLdst *label = new_ldst_label(s);

    label->is_ld = is_ld;
    label->oi = oi;
    label->datalo_reg = datalo;
    label->datahi_reg = datahi;
    label->addrlo_reg = addrlo;
    label->addrhi_reg = addrhi;
    label->raddr = raddr;
    label->label_ptr[0] = label_ptr[0];
    if (TARGET_LONG_BITS == 64) {
        label->label_ptr[1] = label_ptr[1];
    }
}

static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
    TCGMemOpIdx oi = l->oi;
    TCGMemOp opc = get_memop(oi);
    TCGReg v0;
    int i;

    /* resolve label address */
    reloc_pc16(l->label_ptr[0], s->code_ptr);
    if (TARGET_LONG_BITS == 64) {
        reloc_pc16(l->label_ptr[1], s->code_ptr);
    }

    i = 1;
    if (TARGET_LONG_BITS == 64) {
        i = tcg_out_call_iarg_reg2(s, i, l->addrlo_reg, l->addrhi_reg);
    } else {
        i = tcg_out_call_iarg_reg(s, i, l->addrlo_reg);
    }
    i = tcg_out_call_iarg_imm(s, i, oi);
    i = tcg_out_call_iarg_imm(s, i, (intptr_t)l->raddr);
    tcg_out_call_int(s, qemu_ld_helpers[opc & (MO_BSWAP | MO_SSIZE)], false);
    /* delay slot */
    tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0], TCG_AREG0);

    v0 = l->datalo_reg;
    if ((opc & MO_SIZE) == MO_64) {
        /* We eliminated V0 from the possible output registers, so it
           cannot be clobbered here.  So we must move V1 first.  */
        if (MIPS_BE) {
            tcg_out_mov(s, TCG_TYPE_I32, v0, TCG_REG_V1);
            v0 = l->datahi_reg;
        } else {
            tcg_out_mov(s, TCG_TYPE_I32, l->datahi_reg, TCG_REG_V1);
        }
    }

    reloc_pc16(s->code_ptr, l->raddr);
    tcg_out_opc_br(s, OPC_BEQ, TCG_REG_ZERO, TCG_REG_ZERO);
    /* delay slot */
    tcg_out_mov(s, TCG_TYPE_REG, v0, TCG_REG_V0);
}

static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
    TCGMemOpIdx oi = l->oi;
    TCGMemOp opc = get_memop(oi);
    TCGMemOp s_bits = opc & MO_SIZE;
    int i;

    /* resolve label address */
    reloc_pc16(l->label_ptr[0], s->code_ptr);
    if (TARGET_LONG_BITS == 64) {
        reloc_pc16(l->label_ptr[1], s->code_ptr);
    }

    i = 1;
    if (TARGET_LONG_BITS == 64) {
        i = tcg_out_call_iarg_reg2(s, i, l->addrlo_reg, l->addrhi_reg);
    } else {
        i = tcg_out_call_iarg_reg(s, i, l->addrlo_reg);
    }
    switch (s_bits) {
    case MO_8:
        i = tcg_out_call_iarg_reg8(s, i, l->datalo_reg);
        break;
    case MO_16:
        i = tcg_out_call_iarg_reg16(s, i, l->datalo_reg);
        break;
    case MO_32:
        i = tcg_out_call_iarg_reg(s, i, l->datalo_reg);
        break;
    case MO_64:
        i = tcg_out_call_iarg_reg2(s, i, l->datalo_reg, l->datahi_reg);
        break;
    default:
        tcg_abort();
    }
    i = tcg_out_call_iarg_imm(s, i, oi);

    /* Tail call to the store helper.  Thus force the return address
       computation to take place in the return address register.  */
    tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_RA, (intptr_t)l->raddr);
    i = tcg_out_call_iarg_reg(s, i, TCG_REG_RA);
    tcg_out_call_int(s, qemu_st_helpers[opc & (MO_BSWAP | MO_SIZE)], true);
    /* delay slot */
    tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0], TCG_AREG0);
}
#endif

static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
                                   TCGReg base, TCGMemOp opc)
{
    switch (opc & (MO_SSIZE | MO_BSWAP)) {
    case MO_UB:
        tcg_out_opc_imm(s, OPC_LBU, datalo, base, 0);
        break;
    case MO_SB:
        tcg_out_opc_imm(s, OPC_LB, datalo, base, 0);
        break;
    case MO_UW | MO_BSWAP:
        tcg_out_opc_imm(s, OPC_LHU, TCG_TMP1, base, 0);
        tcg_out_bswap16(s, datalo, TCG_TMP1);
        break;
    case MO_UW:
        tcg_out_opc_imm(s, OPC_LHU, datalo, base, 0);
        break;
    case MO_SW | MO_BSWAP:
        tcg_out_opc_imm(s, OPC_LHU, TCG_TMP1, base, 0);
        tcg_out_bswap16s(s, datalo, TCG_TMP1);
        break;
    case MO_SW:
        tcg_out_opc_imm(s, OPC_LH, datalo, base, 0);
        break;
    case MO_UL | MO_BSWAP:
        tcg_out_opc_imm(s, OPC_LW, TCG_TMP1, base, 0);
        tcg_out_bswap32(s, datalo, TCG_TMP1);
        break;
    case MO_UL:
        tcg_out_opc_imm(s, OPC_LW, datalo, base, 0);
        break;
    case MO_Q | MO_BSWAP:
        tcg_out_opc_imm(s, OPC_LW, TCG_TMP1, base, HI_OFF);
        tcg_out_bswap32(s, datalo, TCG_TMP1);
        tcg_out_opc_imm(s, OPC_LW, TCG_TMP1, base, LO_OFF);
        tcg_out_bswap32(s, datahi, TCG_TMP1);
        break;
    case MO_Q:
        tcg_out_opc_imm(s, OPC_LW, datalo, base, LO_OFF);
        tcg_out_opc_imm(s, OPC_LW, datahi, base, HI_OFF);
        break;
    default:
        tcg_abort();
    }
}

static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is_64)
{
    TCGReg addr_regl, addr_regh __attribute__((unused));
    TCGReg data_regl, data_regh;
    TCGMemOpIdx oi;
    TCGMemOp opc;
#if defined(CONFIG_SOFTMMU)
    tcg_insn_unit *label_ptr[2];
#endif
    /* Note that we've eliminated V0 from the output registers,
       so we won't overwrite the base register during loading.  */
    TCGReg base = TCG_REG_V0;

    data_regl = *args++;
    data_regh = (is_64 ? *args++ : 0);
    addr_regl = *args++;
    addr_regh = (TARGET_LONG_BITS == 64 ? *args++ : 0);
    oi = *args++;
    opc = get_memop(oi);

#if defined(CONFIG_SOFTMMU)
    tcg_out_tlb_load(s, base, addr_regl, addr_regh, oi, label_ptr, 1);
    tcg_out_qemu_ld_direct(s, data_regl, data_regh, base, opc);
    add_qemu_ldst_label(s, 1, oi, data_regl, data_regh, addr_regl, addr_regh,
                        s->code_ptr, label_ptr);
#else
    if (guest_base == 0 && data_regl != addr_regl) {
        base = addr_regl;
    } else if (guest_base == (int16_t)guest_base) {
        tcg_out_opc_imm(s, OPC_ADDIU, base, addr_regl, guest_base);
    } else {
        tcg_out_movi(s, TCG_TYPE_PTR, base, guest_base);
        tcg_out_opc_reg(s, OPC_ADDU, base, base, addr_regl);
    }
    tcg_out_qemu_ld_direct(s, data_regl, data_regh, base, opc);
#endif
}

static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
                                   TCGReg base, TCGMemOp opc)
{
    switch (opc & (MO_SIZE | MO_BSWAP)) {
    case MO_8:
        tcg_out_opc_imm(s, OPC_SB, datalo, base, 0);
        break;

    case MO_16 | MO_BSWAP:
        tcg_out_opc_imm(s, OPC_ANDI, TCG_TMP1, datalo, 0xffff);
        tcg_out_bswap16(s, TCG_TMP1, TCG_TMP1);
        datalo = TCG_TMP1;
        /* FALLTHRU */
    case MO_16:
        tcg_out_opc_imm(s, OPC_SH, datalo, base, 0);
        break;

    case MO_32 | MO_BSWAP:
        tcg_out_bswap32(s, TCG_TMP1, datalo);
        datalo = TCG_TMP1;
        /* FALLTHRU */
    case MO_32:
        tcg_out_opc_imm(s, OPC_SW, datalo, base, 0);
        break;

    case MO_64 | MO_BSWAP:
        tcg_out_bswap32(s, TCG_TMP1, datalo);
        tcg_out_opc_imm(s, OPC_SW, TCG_TMP1, base, HI_OFF);
        tcg_out_bswap32(s, TCG_TMP1, datahi);
        tcg_out_opc_imm(s, OPC_SW, TCG_TMP1, base, LO_OFF);
        break;
    case MO_64:
        tcg_out_opc_imm(s, OPC_SW, datalo, base, LO_OFF);
        tcg_out_opc_imm(s, OPC_SW, datahi, base, HI_OFF);
        break;

    default:
        tcg_abort();
    }
}

static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is_64)
{
    TCGReg addr_regl, addr_regh __attribute__((unused));
    TCGReg data_regl, data_regh, base;
    TCGMemOpIdx oi;
    TCGMemOp opc;
#if defined(CONFIG_SOFTMMU)
    tcg_insn_unit *label_ptr[2];
#endif

    data_regl = *args++;
    data_regh = (is_64 ? *args++ : 0);
    addr_regl = *args++;
    addr_regh = (TARGET_LONG_BITS == 64 ? *args++ : 0);
    oi = *args++;
    opc = get_memop(oi);

#if defined(CONFIG_SOFTMMU)
    /* Note that we eliminated the helper's address argument,
       so we can reuse that for the base.  */
    base = (TARGET_LONG_BITS == 32 ? TCG_REG_A1 : TCG_REG_A2);
    tcg_out_tlb_load(s, base, addr_regl, addr_regh, oi, label_ptr, 0);
    tcg_out_qemu_st_direct(s, data_regl, data_regh, base, opc);
    add_qemu_ldst_label(s, 0, oi, data_regl, data_regh, addr_regl, addr_regh,
                        s->code_ptr, label_ptr);
#else
    if (guest_base == 0) {
        base = addr_regl;
    } else {
        base = TCG_REG_A0;
        if (guest_base == (int16_t)guest_base) {
            tcg_out_opc_imm(s, OPC_ADDIU, base, addr_regl, guest_base);
        } else {
            tcg_out_movi(s, TCG_TYPE_PTR, base, guest_base);
            tcg_out_opc_reg(s, OPC_ADDU, base, base, addr_regl);
        }
    }
    tcg_out_qemu_st_direct(s, data_regl, data_regh, base, opc);
#endif
}

static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
                              const TCGArg *args, const int *const_args)
{
    MIPSInsn i1, i2;
    TCGArg a0, a1, a2;
    int c2;

    a0 = args[0];
    a1 = args[1];
    a2 = args[2];
    c2 = const_args[2];

    switch (opc) {
    case INDEX_op_exit_tb:
        {
            TCGReg b0 = TCG_REG_ZERO;

            if (a0 & ~0xffff) {
                tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_V0, a0 & ~0xffff);
                b0 = TCG_REG_V0;
            }
            if (!tcg_out_opc_jmp(s, OPC_J, tb_ret_addr)) {
                tcg_out_movi(s, TCG_TYPE_PTR, TCG_TMP0,
                             (uintptr_t)tb_ret_addr);
                tcg_out_opc_reg(s, OPC_JR, 0, TCG_TMP0, 0);
            }
            tcg_out_opc_imm(s, OPC_ORI, TCG_REG_V0, b0, a0 & 0xffff);
        }
        break;
    case INDEX_op_goto_tb:
        if (s->tb_jmp_offset) {
            /* direct jump method */
            s->tb_jmp_offset[a0] = tcg_current_code_size(s);
            /* Avoid clobbering the address during retranslation.  */
            tcg_out32(s, OPC_J | (*(uint32_t *)s->code_ptr & 0x3ffffff));
        } else {
            /* indirect jump method */
            tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP0, TCG_REG_ZERO,
                       (uintptr_t)(s->tb_next + a0));
            tcg_out_opc_reg(s, OPC_JR, 0, TCG_TMP0, 0);
        }
        tcg_out_nop(s);
        s->tb_next_offset[a0] = tcg_current_code_size(s);
        break;
    case INDEX_op_br:
        tcg_out_brcond(s, TCG_COND_EQ, TCG_REG_ZERO, TCG_REG_ZERO,
                       arg_label(a0));
        break;

    case INDEX_op_ld8u_i32:
        i1 = OPC_LBU;
        goto do_ldst;
    case INDEX_op_ld8s_i32:
        i1 = OPC_LB;
        goto do_ldst;
    case INDEX_op_ld16u_i32:
        i1 = OPC_LHU;
        goto do_ldst;
    case INDEX_op_ld16s_i32:
        i1 = OPC_LH;
        goto do_ldst;
    case INDEX_op_ld_i32:
        i1 = OPC_LW;
        goto do_ldst;
    case INDEX_op_st8_i32:
        i1 = OPC_SB;
        goto do_ldst;
    case INDEX_op_st16_i32:
        i1 = OPC_SH;
        goto do_ldst;
    case INDEX_op_st_i32:
        i1 = OPC_SW;
    do_ldst:
        tcg_out_ldst(s, i1, a0, a1, a2);
        break;

    case INDEX_op_add_i32:
        i1 = OPC_ADDU, i2 = OPC_ADDIU;
        goto do_binary;
    case INDEX_op_or_i32:
        i1 = OPC_OR, i2 = OPC_ORI;
        goto do_binary;
    case INDEX_op_xor_i32:
        i1 = OPC_XOR, i2 = OPC_XORI;
    do_binary:
        if (c2) {
            tcg_out_opc_imm(s, i2, a0, a1, a2);
            break;
        }
    do_binaryv:
        tcg_out_opc_reg(s, i1, a0, a1, a2);
        break;

    case INDEX_op_sub_i32:
        if (c2) {
            tcg_out_opc_imm(s, OPC_ADDIU, a0, a1, -a2);
            break;
        }
        i1 = OPC_SUBU;
        goto do_binary;
    case INDEX_op_and_i32:
        if (c2 && a2 != (uint16_t)a2) {
            int msb = ctz32(~a2) - 1;
            assert(use_mips32r2_instructions);
            assert(is_p2m1(a2));
            tcg_out_opc_bf(s, OPC_EXT, a0, a1, msb, 0);
            break;
        }
        i1 = OPC_AND, i2 = OPC_ANDI;
        goto do_binary;
    case INDEX_op_nor_i32:
        i1 = OPC_NOR;
        goto do_binaryv;

    case INDEX_op_mul_i32:
        if (use_mips32_instructions) {
            tcg_out_opc_reg(s, OPC_MUL, a0, a1, a2);
            break;
        }
        i1 = OPC_MULT, i2 = OPC_MFLO;
        goto do_hilo1;
    case INDEX_op_mulsh_i32:
        i1 = OPC_MULT, i2 = OPC_MFHI;
        goto do_hilo1;
    case INDEX_op_muluh_i32:
        i1 = OPC_MULTU, i2 = OPC_MFHI;
        goto do_hilo1;
    case INDEX_op_div_i32:
        i1 = OPC_DIV, i2 = OPC_MFLO;
        goto do_hilo1;
    case INDEX_op_divu_i32:
        i1 = OPC_DIVU, i2 = OPC_MFLO;
        goto do_hilo1;
    case INDEX_op_rem_i32:
        i1 = OPC_DIV, i2 = OPC_MFHI;
        goto do_hilo1;
    case INDEX_op_remu_i32:
        i1 = OPC_DIVU, i2 = OPC_MFHI;
    do_hilo1:
        tcg_out_opc_reg(s, i1, 0, a1, a2);
        tcg_out_opc_reg(s, i2, a0, 0, 0);
        break;

    case INDEX_op_muls2_i32:
        i1 = OPC_MULT;
        goto do_hilo2;
    case INDEX_op_mulu2_i32:
        i1 = OPC_MULTU;
    do_hilo2:
        tcg_out_opc_reg(s, i1, 0, a2, args[3]);
        tcg_out_opc_reg(s, OPC_MFLO, a0, 0, 0);
        tcg_out_opc_reg(s, OPC_MFHI, a1, 0, 0);
        break;

    case INDEX_op_not_i32:
        i1 = OPC_NOR;
        goto do_unary;
    case INDEX_op_bswap16_i32:
        i1 = OPC_WSBH;
        goto do_unary;
    case INDEX_op_ext8s_i32:
        i1 = OPC_SEB;
        goto do_unary;
    case INDEX_op_ext16s_i32:
        i1 = OPC_SEH;
    do_unary:
        tcg_out_opc_reg(s, i1, a0, TCG_REG_ZERO, a1);
        break;

    case INDEX_op_sar_i32:
        i1 = OPC_SRAV, i2 = OPC_SRA;
        goto do_shift;
    case INDEX_op_shl_i32:
        i1 = OPC_SLLV, i2 = OPC_SLL;
        goto do_shift;
    case INDEX_op_shr_i32:
        i1 = OPC_SRLV, i2 = OPC_SRL;
        goto do_shift;
    case INDEX_op_rotr_i32:
        i1 = OPC_ROTRV, i2 = OPC_ROTR;
    do_shift:
        if (c2) {
            tcg_out_opc_sa(s, i2, a0, a1, a2);
        } else {
            tcg_out_opc_reg(s, i1, a0, a2, a1);
        }
        break;
    case INDEX_op_rotl_i32:
        if (c2) {
            tcg_out_opc_sa(s, OPC_ROTR, a0, a1, 32 - a2);
        } else {
            tcg_out_opc_reg(s, OPC_SUBU, TCG_TMP0, TCG_REG_ZERO, a2);
            tcg_out_opc_reg(s, OPC_ROTRV, a0, TCG_TMP0, a1);
        }
        break;

    case INDEX_op_bswap32_i32:
        tcg_out_opc_reg(s, OPC_WSBH, a0, 0, a1);
        tcg_out_opc_sa(s, OPC_ROTR, a0, a0, 16);
        break;

    case INDEX_op_deposit_i32:
        tcg_out_opc_bf(s, OPC_INS, a0, a2, args[3] + args[4] - 1, args[3]);
        break;

    case INDEX_op_brcond_i32:
        tcg_out_brcond(s, a2, a0, a1, arg_label(args[3]));
        break;
    case INDEX_op_brcond2_i32:
        tcg_out_brcond2(s, args[4], a0, a1, a2, args[3], arg_label(args[5]));
        break;

    case INDEX_op_movcond_i32:
        tcg_out_movcond(s, args[5], a0, a1, a2, args[3]);
        break;

    case INDEX_op_setcond_i32:
        tcg_out_setcond(s, args[3], a0, a1, a2);
        break;
    case INDEX_op_setcond2_i32:
        tcg_out_setcond2(s, args[5], a0, a1, a2, args[3], args[4]);
        break;

    case INDEX_op_qemu_ld_i32:
        tcg_out_qemu_ld(s, args, false);
        break;
    case INDEX_op_qemu_ld_i64:
        tcg_out_qemu_ld(s, args, true);
        break;
    case INDEX_op_qemu_st_i32:
        tcg_out_qemu_st(s, args, false);
        break;
    case INDEX_op_qemu_st_i64:
        tcg_out_qemu_st(s, args, true);
        break;

    case INDEX_op_add2_i32:
        tcg_out_addsub2(s, a0, a1, a2, args[3], args[4], args[5],
                        const_args[4], const_args[5], false);
        break;
    case INDEX_op_sub2_i32:
        tcg_out_addsub2(s, a0, a1, a2, args[3], args[4], args[5],
                        const_args[4], const_args[5], true);
        break;

    case INDEX_op_mov_i32:  /* Always emitted via tcg_out_mov.  */
    case INDEX_op_movi_i32: /* Always emitted via tcg_out_movi.  */
    case INDEX_op_call:     /* Always emitted via tcg_out_call.  */
    default:
        tcg_abort();
    }
}

static const TCGTargetOpDef mips_op_defs[] = {
    { INDEX_op_exit_tb, { } },
    { INDEX_op_goto_tb, { } },
    { INDEX_op_br, { } },

    { INDEX_op_ld8u_i32, { "r", "r" } },
    { INDEX_op_ld8s_i32, { "r", "r" } },
    { INDEX_op_ld16u_i32, { "r", "r" } },
    { INDEX_op_ld16s_i32, { "r", "r" } },
    { INDEX_op_ld_i32, { "r", "r" } },
    { INDEX_op_st8_i32, { "rZ", "r" } },
    { INDEX_op_st16_i32, { "rZ", "r" } },
    { INDEX_op_st_i32, { "rZ", "r" } },

    { INDEX_op_add_i32, { "r", "rZ", "rJ" } },
    { INDEX_op_mul_i32, { "r", "rZ", "rZ" } },
    { INDEX_op_muls2_i32, { "r", "r", "rZ", "rZ" } },
    { INDEX_op_mulu2_i32, { "r", "r", "rZ", "rZ" } },
    { INDEX_op_mulsh_i32, { "r", "rZ", "rZ" } },
    { INDEX_op_muluh_i32, { "r", "rZ", "rZ" } },
    { INDEX_op_div_i32, { "r", "rZ", "rZ" } },
    { INDEX_op_divu_i32, { "r", "rZ", "rZ" } },
    { INDEX_op_rem_i32, { "r", "rZ", "rZ" } },
    { INDEX_op_remu_i32, { "r", "rZ", "rZ" } },
    { INDEX_op_sub_i32, { "r", "rZ", "rN" } },

    { INDEX_op_and_i32, { "r", "rZ", "rIK" } },
    { INDEX_op_nor_i32, { "r", "rZ", "rZ" } },
    { INDEX_op_not_i32, { "r", "rZ" } },
    { INDEX_op_or_i32, { "r", "rZ", "rIZ" } },
    { INDEX_op_xor_i32, { "r", "rZ", "rIZ" } },

    { INDEX_op_shl_i32, { "r", "rZ", "ri" } },
    { INDEX_op_shr_i32, { "r", "rZ", "ri" } },
    { INDEX_op_sar_i32, { "r", "rZ", "ri" } },
    { INDEX_op_rotr_i32, { "r", "rZ", "ri" } },
    { INDEX_op_rotl_i32, { "r", "rZ", "ri" } },

    { INDEX_op_bswap16_i32, { "r", "r" } },
    { INDEX_op_bswap32_i32, { "r", "r" } },

    { INDEX_op_ext8s_i32, { "r", "rZ" } },
    { INDEX_op_ext16s_i32, { "r", "rZ" } },

    { INDEX_op_deposit_i32, { "r", "0", "rZ" } },

    { INDEX_op_brcond_i32, { "rZ", "rZ" } },
    { INDEX_op_movcond_i32, { "r", "rZ", "rZ", "rZ", "0" } },
    { INDEX_op_setcond_i32, { "r", "rZ", "rZ" } },
    { INDEX_op_setcond2_i32, { "r", "rZ", "rZ", "rZ", "rZ" } },

    { INDEX_op_add2_i32, { "r", "r", "rZ", "rZ", "rN", "rN" } },
    { INDEX_op_sub2_i32, { "r", "r", "rZ", "rZ", "rN", "rN" } },
    { INDEX_op_brcond2_i32, { "rZ", "rZ", "rZ", "rZ" } },

#if TARGET_LONG_BITS == 32
    { INDEX_op_qemu_ld_i32, { "L", "lZ" } },
    { INDEX_op_qemu_st_i32, { "SZ", "SZ" } },
    { INDEX_op_qemu_ld_i64, { "L", "L", "lZ" } },
    { INDEX_op_qemu_st_i64, { "SZ", "SZ", "SZ" } },
#else
    { INDEX_op_qemu_ld_i32, { "L", "lZ", "lZ" } },
    { INDEX_op_qemu_st_i32, { "SZ", "SZ", "SZ" } },
    { INDEX_op_qemu_ld_i64, { "L", "L", "lZ", "lZ" } },
    { INDEX_op_qemu_st_i64, { "SZ", "SZ", "SZ", "SZ" } },
#endif
    { -1 },
};

static int tcg_target_callee_save_regs[] = {
    TCG_REG_S0,       /* used for the global env (TCG_AREG0) */
    TCG_REG_S1,
    TCG_REG_S2,
    TCG_REG_S3,
    TCG_REG_S4,
    TCG_REG_S5,
    TCG_REG_S6,
    TCG_REG_S7,
    TCG_REG_S8,
    TCG_REG_RA,       /* should be last for ABI compliance */
};

/* The Linux kernel doesn't provide any information about the available
   instruction set. Probe it using a signal handler. */

#include <signal.h>

#ifndef use_movnz_instructions
bool use_movnz_instructions = false;
#endif

#ifndef use_mips32_instructions
bool use_mips32_instructions = false;
#endif

#ifndef use_mips32r2_instructions
bool use_mips32r2_instructions = false;
#endif

static volatile sig_atomic_t got_sigill;

static void sigill_handler(int signo, siginfo_t *si, void *data)
{
    /* Skip the faulty instruction */
    ucontext_t *uc = (ucontext_t *)data;
    uc->uc_mcontext.pc += 4;

    got_sigill = 1;
}

static void tcg_target_detect_isa(void)
{
    struct sigaction sa_old, sa_new;

    memset(&sa_new, 0, sizeof(sa_new));
    sa_new.sa_flags = SA_SIGINFO;
    sa_new.sa_sigaction = sigill_handler;
    sigaction(SIGILL, &sa_new, &sa_old);

    /* Probe for movn/movz, necessary to implement movcond. */
#ifndef use_movnz_instructions
    got_sigill = 0;
    asm volatile(".set push\n"
                 ".set mips32\n"
                 "movn $zero, $zero, $zero\n"
                 "movz $zero, $zero, $zero\n"
                 ".set pop\n"
                 : : : );
    use_movnz_instructions = !got_sigill;
#endif

    /* Probe for MIPS32 instructions. As no subsetting is allowed
       by the specification, it is only necessary to probe for one
       of the instructions. */
#ifndef use_mips32_instructions
    got_sigill = 0;
    asm volatile(".set push\n"
                 ".set mips32\n"
                 "mul $zero, $zero\n"
                 ".set pop\n"
                 : : : );
    use_mips32_instructions = !got_sigill;
#endif

    /* Probe for MIPS32r2 instructions if MIPS32 instructions are
       available. As no subsetting is allowed by the specification,
       it is only necessary to probe for one of the instructions. */
#ifndef use_mips32r2_instructions
    if (use_mips32_instructions) {
        got_sigill = 0;
        asm volatile(".set push\n"
                     ".set mips32r2\n"
                     "seb $zero, $zero\n"
                     ".set pop\n"
                     : : : );
        use_mips32r2_instructions = !got_sigill;
    }
#endif

    sigaction(SIGILL, &sa_old, NULL);
}

/* Generate global QEMU prologue and epilogue code */
static void tcg_target_qemu_prologue(TCGContext *s)
{
    int i, frame_size;

    /* reserve some stack space, also for TCG temps. */
    frame_size = ARRAY_SIZE(tcg_target_callee_save_regs) * 4
                 + TCG_STATIC_CALL_ARGS_SIZE
                 + CPU_TEMP_BUF_NLONGS * sizeof(long);
    frame_size = (frame_size + TCG_TARGET_STACK_ALIGN - 1) &
                 ~(TCG_TARGET_STACK_ALIGN - 1);
    tcg_set_frame(s, TCG_REG_SP, ARRAY_SIZE(tcg_target_callee_save_regs) * 4
                  + TCG_STATIC_CALL_ARGS_SIZE,
                  CPU_TEMP_BUF_NLONGS * sizeof(long));

    /* TB prologue */
    tcg_out_addi(s, TCG_REG_SP, -frame_size);
    for(i = 0 ; i < ARRAY_SIZE(tcg_target_callee_save_regs) ; i++) {
        tcg_out_st(s, TCG_TYPE_I32, tcg_target_callee_save_regs[i],
                   TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE + i * 4);
    }

    /* Call generated code */
    tcg_out_opc_reg(s, OPC_JR, 0, tcg_target_call_iarg_regs[1], 0);
    tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]);
    tb_ret_addr = s->code_ptr;

    /* TB epilogue */
    for(i = 0 ; i < ARRAY_SIZE(tcg_target_callee_save_regs) ; i++) {
        tcg_out_ld(s, TCG_TYPE_I32, tcg_target_callee_save_regs[i],
                   TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE + i * 4);
    }

    tcg_out_opc_reg(s, OPC_JR, 0, TCG_REG_RA, 0);
    tcg_out_addi(s, TCG_REG_SP, frame_size);
}

static void tcg_target_init(TCGContext *s)
{
    tcg_target_detect_isa();
    tcg_regset_set(tcg_target_available_regs[TCG_TYPE_I32], 0xffffffff);
    tcg_regset_set(tcg_target_call_clobber_regs,
                   (1 << TCG_REG_V0) |
                   (1 << TCG_REG_V1) |
                   (1 << TCG_REG_A0) |
                   (1 << TCG_REG_A1) |
                   (1 << TCG_REG_A2) |
                   (1 << TCG_REG_A3) |
                   (1 << TCG_REG_T0) |
                   (1 << TCG_REG_T1) |
                   (1 << TCG_REG_T2) |
                   (1 << TCG_REG_T3) |
                   (1 << TCG_REG_T4) |
                   (1 << TCG_REG_T5) |
                   (1 << TCG_REG_T6) |
                   (1 << TCG_REG_T7) |
                   (1 << TCG_REG_T8) |
                   (1 << TCG_REG_T9));

    tcg_regset_clear(s->reserved_regs);
    tcg_regset_set_reg(s->reserved_regs, TCG_REG_ZERO); /* zero register */
    tcg_regset_set_reg(s->reserved_regs, TCG_REG_K0);   /* kernel use only */
    tcg_regset_set_reg(s->reserved_regs, TCG_REG_K1);   /* kernel use only */
    tcg_regset_set_reg(s->reserved_regs, TCG_TMP0);     /* internal use */
    tcg_regset_set_reg(s->reserved_regs, TCG_TMP1);     /* internal use */
    tcg_regset_set_reg(s->reserved_regs, TCG_REG_RA);   /* return address */
    tcg_regset_set_reg(s->reserved_regs, TCG_REG_SP);   /* stack pointer */
    tcg_regset_set_reg(s->reserved_regs, TCG_REG_GP);   /* global pointer */

    tcg_add_target_add_op_defs(mips_op_defs);
}

void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
{
    uint32_t *ptr = (uint32_t *)jmp_addr;
    *ptr = deposit32(*ptr, 0, 26, addr >> 2);
    flush_icache_range(jmp_addr, jmp_addr + 4);
}