summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/entry.S
blob: 2f96256dc5153bf04e06b176bff63da240495c3f (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
/* arch/sparc/kernel/entry.S:  Sparc trap low-level entry points.
 *
 * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1996 Eddie C. Dost   (ecd@skynet.be)
 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
 * Copyright (C) 1996-1999 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 Anton Blanchard (anton@progsoc.uts.edu.au)
 */

#include <linux/errno.h>

#include <asm/head.h>
#include <asm/asi.h>
#include <asm/smp.h>
#include <asm/contregs.h>
#include <asm/ptrace.h>
#include <asm/asm-offsets.h>
#include <asm/psr.h>
#include <asm/vaddrs.h>
#include <asm/memreg.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#ifdef CONFIG_SUN4
#include <asm/pgtsun4.h>
#else
#include <asm/pgtsun4c.h>
#endif
#include <asm/winmacro.h>
#include <asm/signal.h>
#include <asm/obio.h>
#include <asm/mxcc.h>
#include <asm/thread_info.h>
#include <asm/param.h>
#include <asm/unistd.h>

#include <asm/asmmacro.h>

#define curptr      g6

/* These are just handy. */
#define _SV	save	%sp, -STACKFRAME_SZ, %sp
#define _RS     restore 

#define FLUSH_ALL_KERNEL_WINDOWS \
	_SV; _SV; _SV; _SV; _SV; _SV; _SV; \
	_RS; _RS; _RS; _RS; _RS; _RS; _RS;

	.text

#ifdef CONFIG_KGDB
	.align	4
	.globl		arch_kgdb_breakpoint
	.type		arch_kgdb_breakpoint,#function
arch_kgdb_breakpoint:
	ta		0x7d
	retl
	 nop
	.size		arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
#endif

#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
	.align	4
	.globl	floppy_hardint
floppy_hardint:
	/*
	 * This code cannot touch registers %l0 %l1 and %l2
	 * because SAVE_ALL depends on their values. It depends
	 * on %l3 also, but we regenerate it before a call.
	 * Other registers are:
	 * %l3 -- base address of fdc registers
	 * %l4 -- pdma_vaddr
	 * %l5 -- scratch for ld/st address
	 * %l6 -- pdma_size
	 * %l7 -- scratch [floppy byte, ld/st address, aux. data]
	 */

	/* Do we have work to do? */
	sethi	%hi(doing_pdma), %l7
	ld	[%l7 + %lo(doing_pdma)], %l7
	cmp	%l7, 0
	be	floppy_dosoftint
	 nop

	/* Load fdc register base */
	sethi	%hi(fdc_status), %l3
	ld	[%l3 + %lo(fdc_status)], %l3

	/* Setup register addresses */
	sethi	%hi(pdma_vaddr), %l5	! transfer buffer
	ld	[%l5 + %lo(pdma_vaddr)], %l4
	sethi	%hi(pdma_size), %l5	! bytes to go
	ld	[%l5 + %lo(pdma_size)], %l6
next_byte:
  	ldub	[%l3], %l7

	andcc	%l7, 0x80, %g0		! Does fifo still have data
	bz	floppy_fifo_emptied	! fifo has been emptied...
	 andcc	%l7, 0x20, %g0		! in non-dma mode still?
	bz	floppy_overrun		! nope, overrun
	 andcc	%l7, 0x40, %g0		! 0=write 1=read
	bz	floppy_write
	 sub	%l6, 0x1, %l6

	/* Ok, actually read this byte */
	ldub	[%l3 + 1], %l7
	orcc	%g0, %l6, %g0
	stb	%l7, [%l4]
	bne	next_byte
	 add	%l4, 0x1, %l4

	b	floppy_tdone
	 nop

floppy_write:
	/* Ok, actually write this byte */
	ldub	[%l4], %l7
	orcc	%g0, %l6, %g0
	stb	%l7, [%l3 + 1]
	bne	next_byte
	 add	%l4, 0x1, %l4

	/* fall through... */
floppy_tdone:
	sethi	%hi(pdma_vaddr), %l5
	st	%l4, [%l5 + %lo(pdma_vaddr)]
	sethi	%hi(pdma_size), %l5
	st	%l6, [%l5 + %lo(pdma_size)]
	/* Flip terminal count pin */
	set	auxio_register, %l7
	ld	[%l7], %l7

	set	sparc_cpu_model, %l5
	ld	[%l5], %l5
	subcc   %l5, 1, %g0		/* enum { sun4c = 1 }; */
	be	1f
	 ldub	[%l7], %l5

	or	%l5, 0xc2, %l5
	stb	%l5, [%l7]
	andn    %l5, 0x02, %l5
	b	2f
	 nop

1:
	or      %l5, 0xf4, %l5
	stb     %l5, [%l7]
	andn    %l5, 0x04, %l5

2:
	/* Kill some time so the bits set */
	WRITE_PAUSE
	WRITE_PAUSE

	stb     %l5, [%l7]

	/* Prevent recursion */
	sethi	%hi(doing_pdma), %l7
	b	floppy_dosoftint
	 st	%g0, [%l7 + %lo(doing_pdma)]

	/* We emptied the FIFO, but we haven't read everything
	 * as of yet.  Store the current transfer address and
	 * bytes left to read so we can continue when the next
	 * fast IRQ comes in.
	 */
floppy_fifo_emptied:
	sethi	%hi(pdma_vaddr), %l5
	st	%l4, [%l5 + %lo(pdma_vaddr)]
	sethi	%hi(pdma_size), %l7
	st	%l6, [%l7 + %lo(pdma_size)]

	/* Restore condition codes */
	wr	%l0, 0x0, %psr
	WRITE_PAUSE

	jmp	%l1
	rett	%l2

floppy_overrun:
	sethi	%hi(pdma_vaddr), %l5
	st	%l4, [%l5 + %lo(pdma_vaddr)]
	sethi	%hi(pdma_size), %l5
	st	%l6, [%l5 + %lo(pdma_size)]
	/* Prevent recursion */
	sethi	%hi(doing_pdma), %l7
	st	%g0, [%l7 + %lo(doing_pdma)]

	/* fall through... */
floppy_dosoftint:
	rd	%wim, %l3
	SAVE_ALL

	/* Set all IRQs off. */
	or	%l0, PSR_PIL, %l4
	wr	%l4, 0x0, %psr
	WRITE_PAUSE
	wr	%l4, PSR_ET, %psr
	WRITE_PAUSE

	mov	11, %o0			! floppy irq level (unused anyway)
	mov	%g0, %o1		! devid is not used in fast interrupts
	call	sparc_floppy_irq
	 add	%sp, STACKFRAME_SZ, %o2	! struct pt_regs *regs

	RESTORE_ALL
	
#endif /* (CONFIG_BLK_DEV_FD) */

	/* Bad trap handler */
	.globl	bad_trap_handler
bad_trap_handler:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0	! pt_regs
	call	do_hw_interrupt
	 mov	%l7, %o1		! trap number

	RESTORE_ALL
	
/* For now all IRQ's not registered get sent here. handler_irq() will
 * see if a routine is registered to handle this interrupt and if not
 * it will say so on the console.
 */

	.align	4
	.globl	real_irq_entry, patch_handler_irq
real_irq_entry:
	SAVE_ALL

#ifdef CONFIG_SMP
	.globl	patchme_maybe_smp_msg

	cmp	%l7, 12
patchme_maybe_smp_msg:
	bgu	maybe_smp4m_msg
	 nop
#endif

real_irq_continue:
	or	%l0, PSR_PIL, %g2
	wr	%g2, 0x0, %psr
	WRITE_PAUSE
	wr	%g2, PSR_ET, %psr
	WRITE_PAUSE
	mov	%l7, %o0		! irq level
patch_handler_irq:
	call	handler_irq
	 add	%sp, STACKFRAME_SZ, %o1	! pt_regs ptr
	or	%l0, PSR_PIL, %g2	! restore PIL after handler_irq
	wr	%g2, PSR_ET, %psr	! keep ET up
	WRITE_PAUSE

	RESTORE_ALL

#ifdef CONFIG_SMP
	/* SMP per-cpu ticker interrupts are handled specially. */
smp4m_ticker:
	bne	real_irq_continue+4
	 or	%l0, PSR_PIL, %g2
	wr	%g2, 0x0, %psr
	WRITE_PAUSE
	wr	%g2, PSR_ET, %psr
	WRITE_PAUSE
	call	smp4m_percpu_timer_interrupt
	 add	%sp, STACKFRAME_SZ, %o0
	wr	%l0, PSR_ET, %psr
	WRITE_PAUSE
	RESTORE_ALL

	/* Here is where we check for possible SMP IPI passed to us
	 * on some level other than 15 which is the NMI and only used
	 * for cross calls.  That has a separate entry point below.
	 */
maybe_smp4m_msg:
	GET_PROCESSOR4M_ID(o3)
	set	sun4m_interrupts, %l5
	ld	[%l5], %o5
	sethi	%hi(0x40000000), %o2
	sll	%o3, 12, %o3
	ld	[%o5 + %o3], %o1
	andcc	%o1, %o2, %g0
	be,a	smp4m_ticker
	 cmp	%l7, 14
	st	%o2, [%o5 + 0x4]
	WRITE_PAUSE
	ld	[%o5], %g0
	WRITE_PAUSE
	or	%l0, PSR_PIL, %l4
	wr	%l4, 0x0, %psr
	WRITE_PAUSE
	wr	%l4, PSR_ET, %psr
	WRITE_PAUSE
	call	smp_reschedule_irq
	 nop

	RESTORE_ALL

	.align	4
	.globl	linux_trap_ipi15_sun4m
linux_trap_ipi15_sun4m:
	SAVE_ALL
	sethi	%hi(0x80000000), %o2
	GET_PROCESSOR4M_ID(o0)
	set	sun4m_interrupts, %l5
	ld	[%l5], %o5
	sll	%o0, 12, %o0
	add	%o5, %o0, %o5
	ld	[%o5], %o3
	andcc	%o3, %o2, %g0
	be	1f			! Must be an NMI async memory error
	 st	%o2, [%o5 + 4]
	WRITE_PAUSE
	ld	[%o5], %g0
	WRITE_PAUSE
	or	%l0, PSR_PIL, %l4
	wr	%l4, 0x0, %psr
	WRITE_PAUSE
	wr	%l4, PSR_ET, %psr
	WRITE_PAUSE
	call	smp4m_cross_call_irq
	 nop
	b	ret_trap_lockless_ipi
	 clr	%l6
1:
	/* NMI async memory error handling. */
	sethi	%hi(0x80000000), %l4
	sethi	%hi(0x4000), %o3
	sub	%o5, %o0, %o5
	add	%o5, %o3, %l5
	st	%l4, [%l5 + 0xc]
	WRITE_PAUSE
	ld	[%l5], %g0
	WRITE_PAUSE
	or	%l0, PSR_PIL, %l4
	wr	%l4, 0x0, %psr
	WRITE_PAUSE
	wr	%l4, PSR_ET, %psr
	WRITE_PAUSE
	call	sun4m_nmi
	 nop
	st	%l4, [%l5 + 0x8]
	WRITE_PAUSE
	ld	[%l5], %g0
	WRITE_PAUSE
	RESTORE_ALL

	.globl	smp4d_ticker
	/* SMP per-cpu ticker interrupts are handled specially. */
smp4d_ticker:
	SAVE_ALL
	or	%l0, PSR_PIL, %g2
	sethi	%hi(CC_ICLR), %o0
	sethi	%hi(1 << 14), %o1
	or	%o0, %lo(CC_ICLR), %o0
	stha	%o1, [%o0] ASI_M_MXCC	/* Clear PIL 14 in MXCC's ICLR */
	wr	%g2, 0x0, %psr
	WRITE_PAUSE
	wr	%g2, PSR_ET, %psr
	WRITE_PAUSE
	call	smp4d_percpu_timer_interrupt
	 add	%sp, STACKFRAME_SZ, %o0
	wr	%l0, PSR_ET, %psr
	WRITE_PAUSE
	RESTORE_ALL

	.align	4
	.globl	linux_trap_ipi15_sun4d
linux_trap_ipi15_sun4d:
	SAVE_ALL
	sethi	%hi(CC_BASE), %o4
	sethi	%hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
	or	%o4, (CC_EREG - CC_BASE), %o0
	ldda	[%o0] ASI_M_MXCC, %o0
	andcc	%o0, %o2, %g0
	bne	1f
	 sethi	%hi(BB_STAT2), %o2
	lduba	[%o2] ASI_M_CTL, %o2
	andcc	%o2, BB_STAT2_MASK, %g0
	bne	2f
	 or	%o4, (CC_ICLR - CC_BASE), %o0
	sethi	%hi(1 << 15), %o1
	stha	%o1, [%o0] ASI_M_MXCC	/* Clear PIL 15 in MXCC's ICLR */
	or	%l0, PSR_PIL, %l4
	wr	%l4, 0x0, %psr
	WRITE_PAUSE
	wr	%l4, PSR_ET, %psr
	WRITE_PAUSE
	call	smp4d_cross_call_irq
	 nop
	b	ret_trap_lockless_ipi
	 clr	%l6

1:	/* MXCC error */
2:	/* BB error */
	/* Disable PIL 15 */
	set	CC_IMSK, %l4
	lduha	[%l4] ASI_M_MXCC, %l5
	sethi	%hi(1 << 15), %l7
	or	%l5, %l7, %l5
	stha	%l5, [%l4] ASI_M_MXCC
	/* FIXME */
1:	b,a	1b

#endif /* CONFIG_SMP */

	/* This routine handles illegal instructions and privileged
	 * instruction attempts from user code.
	 */
	.align	4
	.globl	bad_instruction
bad_instruction:
	sethi	%hi(0xc1f80000), %l4
	ld	[%l1], %l5
	sethi	%hi(0x81d80000), %l7
	and	%l5, %l4, %l5
	cmp	%l5, %l7
	be	1f
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	do_illegal_instruction
	 mov	%l0, %o3

	RESTORE_ALL

1:	/* unimplemented flush - just skip */
	jmpl	%l2, %g0
	 rett	%l2 + 4

	.align	4
	.globl	priv_instruction
priv_instruction:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	do_priv_instruction
	 mov	%l0, %o3

	RESTORE_ALL

	/* This routine handles unaligned data accesses. */
	.align	4
	.globl	mna_handler
mna_handler:
	andcc	%l0, PSR_PS, %g0
	be	mna_fromuser
	 nop

	SAVE_ALL

	wr	%l0, PSR_ET, %psr
	WRITE_PAUSE

	ld	[%l1], %o1
	call	kernel_unaligned_trap
	 add	%sp, STACKFRAME_SZ, %o0

	RESTORE_ALL

mna_fromuser:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	ld	[%l1], %o1
	call	user_unaligned_trap
	 add	%sp, STACKFRAME_SZ, %o0

	RESTORE_ALL

	/* This routine handles floating point disabled traps. */
	.align	4
	.globl	fpd_trap_handler
fpd_trap_handler:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	do_fpd_trap
	 mov	%l0, %o3

	RESTORE_ALL

	/* This routine handles Floating Point Exceptions. */
	.align	4
	.globl	fpe_trap_handler
fpe_trap_handler:
	set	fpsave_magic, %l5
	cmp	%l1, %l5
	be	1f
	 sethi	%hi(fpsave), %l5
	or	%l5, %lo(fpsave), %l5
	cmp	%l1, %l5
	bne	2f
	 sethi	%hi(fpsave_catch2), %l5
	or	%l5, %lo(fpsave_catch2), %l5
	wr	%l0, 0x0, %psr
	WRITE_PAUSE
	jmp	%l5
	 rett	%l5 + 4
1:	
	sethi	%hi(fpsave_catch), %l5
	or	%l5, %lo(fpsave_catch), %l5
	wr	%l0, 0x0, %psr
	WRITE_PAUSE
	jmp	%l5
	 rett	%l5 + 4

2:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	do_fpe_trap
	 mov	%l0, %o3

	RESTORE_ALL

	/* This routine handles Tag Overflow Exceptions. */
	.align	4
	.globl	do_tag_overflow
do_tag_overflow:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	handle_tag_overflow
	 mov	%l0, %o3

	RESTORE_ALL

	/* This routine handles Watchpoint Exceptions. */
	.align	4
	.globl	do_watchpoint
do_watchpoint:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	handle_watchpoint
	 mov	%l0, %o3

	RESTORE_ALL

	/* This routine handles Register Access Exceptions. */
	.align	4
	.globl	do_reg_access
do_reg_access:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	handle_reg_access
	 mov	%l0, %o3

	RESTORE_ALL

	/* This routine handles Co-Processor Disabled Exceptions. */
	.align	4
	.globl	do_cp_disabled
do_cp_disabled:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	handle_cp_disabled
	 mov	%l0, %o3

	RESTORE_ALL

	/* This routine handles Co-Processor Exceptions. */
	.align	4
	.globl	do_cp_exception
do_cp_exception:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	handle_cp_exception
	 mov	%l0, %o3

	RESTORE_ALL

	/* This routine handles Hardware Divide By Zero Exceptions. */
	.align	4
	.globl	do_hw_divzero
do_hw_divzero:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr		! re-enable traps
	WRITE_PAUSE

	add	%sp, STACKFRAME_SZ, %o0
	mov	%l1, %o1
	mov	%l2, %o2
	call	handle_hw_divzero
	 mov	%l0, %o3

	RESTORE_ALL

	.align	4
	.globl	do_flush_windows
do_flush_windows:
	SAVE_ALL

	wr	%l0, PSR_ET, %psr
	WRITE_PAUSE

	andcc	%l0, PSR_PS, %g0
	bne	dfw_kernel
	 nop

	call	flush_user_windows
	 nop

	/* Advance over the trap instruction. */
	ld	[%sp + STACKFRAME_SZ + PT_NPC], %l1
	add	%l1, 0x4, %l2
	st	%l1, [%sp + STACKFRAME_SZ + PT_PC]
	st	%l2, [%sp + STACKFRAME_SZ + PT_NPC]

	RESTORE_ALL

	.globl	flush_patch_one

	/* We get these for debugging routines using __builtin_return_address() */
dfw_kernel:
flush_patch_one:
	FLUSH_ALL_KERNEL_WINDOWS

	/* Advance over the trap instruction. */
	ld	[%sp + STACKFRAME_SZ + PT_NPC], %l1
	add	%l1, 0x4, %l2
	st	%l1, [%sp + STACKFRAME_SZ + PT_PC]
	st	%l2, [%sp + STACKFRAME_SZ + PT_NPC]

	RESTORE_ALL

	/* The getcc software trap.  The user wants the condition codes from
	 * the %psr in register %g1.
	 */

	.align	4
	.globl	getcc_trap_handler
getcc_trap_handler:
	srl	%l0, 20, %g1	! give user
	and	%g1, 0xf, %g1	! only ICC bits in %psr
	jmp	%l2		! advance over trap instruction
	rett	%l2 + 0x4	! like this...

	/* The setcc software trap.  The user has condition codes in %g1
	 * that it would like placed in the %psr.  Be careful not to flip
	 * any unintentional bits!
	 */

	.align	4
	.globl	setcc_trap_handler
setcc_trap_handler:
	sll	%g1, 0x14, %l4
	set	PSR_ICC, %l5
	andn	%l0, %l5, %l0	! clear ICC bits in %psr
	and	%l4, %l5, %l4	! clear non-ICC bits in user value
	or	%l4, %l0, %l4	! or them in... mix mix mix

	wr	%l4, 0x0, %psr	! set new %psr
	WRITE_PAUSE		! TI scumbags...

	jmp	%l2		! advance over trap instruction
	rett	%l2 + 0x4	! like this...

	.align	4
	.globl	linux_trap_nmi_sun4c
linux_trap_nmi_sun4c:
	SAVE_ALL

	/* Ugh, we need to clear the IRQ line.  This is now
	 * a very sun4c specific trap handler...
	 */
	sethi	%hi(interrupt_enable), %l5
	ld	[%l5 + %lo(interrupt_enable)], %l5
	ldub	[%l5], %l6
	andn	%l6, INTS_ENAB, %l6
	stb	%l6, [%l5]

	/* Now it is safe to re-enable traps without recursion. */
	or	%l0, PSR_PIL, %l0
	wr	%l0, PSR_ET, %psr
	WRITE_PAUSE

	/* Now call the c-code with the pt_regs frame ptr and the
	 * memory error registers as arguments.  The ordering chosen
	 * here is due to unlatching semantics.
	 */
	sethi	%hi(AC_SYNC_ERR), %o0
	add	%o0, 0x4, %o0
	lda	[%o0] ASI_CONTROL, %o2	! sync vaddr
	sub	%o0, 0x4, %o0
	lda	[%o0] ASI_CONTROL, %o1	! sync error
	add	%o0, 0xc, %o0
	lda	[%o0] ASI_CONTROL, %o4	! async vaddr
	sub	%o0, 0x4, %o0
	lda	[%o0] ASI_CONTROL, %o3	! async error
	call	sparc_lvl15_nmi
	 add	%sp, STACKFRAME_SZ, %o0

	RESTORE_ALL

	.align	4
	.globl	invalid_segment_patch1_ff
	.globl	invalid_segment_patch2_ff
invalid_segment_patch1_ff:	cmp	%l4, 0xff
invalid_segment_patch2_ff:	mov	0xff, %l3

	.align	4
	.globl	invalid_segment_patch1_1ff
	.globl	invalid_segment_patch2_1ff
invalid_segment_patch1_1ff:	cmp	%l4, 0x1ff
invalid_segment_patch2_1ff:	mov	0x1ff, %l3

	.align	4
	.globl	num_context_patch1_16, num_context_patch2_16
num_context_patch1_16:		mov	0x10, %l7
num_context_patch2_16:		mov	0x10, %l7

	.align	4
	.globl	vac_linesize_patch_32
vac_linesize_patch_32:		subcc	%l7, 32, %l7

	.align	4
	.globl	vac_hwflush_patch1_on, vac_hwflush_patch2_on

/*
 * Ugly, but we cant use hardware flushing on the sun4 and we'd require
 * two instructions (Anton)
 */
#ifdef CONFIG_SUN4
vac_hwflush_patch1_on:		nop
#else
vac_hwflush_patch1_on:		addcc	%l7, -PAGE_SIZE, %l7
#endif

vac_hwflush_patch2_on:		sta	%g0, [%l3 + %l7] ASI_HWFLUSHSEG

	.globl	invalid_segment_patch1, invalid_segment_patch2
	.globl	num_context_patch1
	.globl	vac_linesize_patch, vac_hwflush_patch1
	.globl	vac_hwflush_patch2

	.align	4
	.globl	sun4c_fault

! %l0 = %psr
! %l1 = %pc
! %l2 = %npc
! %l3 = %wim
! %l7 = 1 for textfault
! We want error in %l5, vaddr in %l6
sun4c_fault:
#ifdef CONFIG_SUN4
	sethi	%hi(sun4c_memerr_reg), %l4
	ld	[%l4+%lo(sun4c_memerr_reg)], %l4  ! memerr ctrl reg addr
	ld	[%l4], %l6		! memerr ctrl reg
	ld	[%l4 + 4], %l5		! memerr vaddr reg
	andcc	%l6, 0x80, %g0		! check for error type
	st	%g0, [%l4 + 4]		! clear the error
	be	0f			! normal error
	 sethi	%hi(AC_BUS_ERROR), %l4	! bus err reg addr

	call	prom_halt	! something weird happened
					! what exactly did happen?
					! what should we do here?

0:	or	%l4, %lo(AC_BUS_ERROR), %l4	! bus err reg addr
	lduba	[%l4] ASI_CONTROL, %l6	! bus err reg

	cmp    %l7, 1			! text fault?
	be	1f			! yes
	 nop

	ld     [%l1], %l4		! load instruction that caused fault
	srl	%l4, 21, %l4
	andcc	%l4, 1, %g0		! store instruction?

	be	1f			! no
	 sethi	%hi(SUN4C_SYNC_BADWRITE), %l4 ! yep
					! %lo(SUN4C_SYNC_BADWRITE) = 0
	or	%l4, %l6, %l6		! set write bit to emulate sun4c
1:
#else
	sethi	%hi(AC_SYNC_ERR), %l4
	add	%l4, 0x4, %l6			! AC_SYNC_VA in %l6
	lda	[%l6] ASI_CONTROL, %l5		! Address
	lda	[%l4] ASI_CONTROL, %l6		! Error, retained for a bit
#endif

	andn	%l5, 0xfff, %l5			! Encode all info into l7
	srl	%l6, 14, %l4

	and	%l4, 2, %l4
	or	%l5, %l4, %l4

	or	%l4, %l7, %l7			! l7 = [addr,write,txtfault]

	andcc	%l0, PSR_PS, %g0
	be	sun4c_fault_fromuser
	 andcc	%l7, 1, %g0			! Text fault?

	be	1f
	 sethi	%hi(KERNBASE), %l4

	mov	%l1, %l5			! PC

1:
	cmp	%l5, %l4
	blu	sun4c_fault_fromuser
	 sethi	%hi(~((1 << SUN4C_REAL_PGDIR_SHIFT) - 1)), %l4

	/* If the kernel references a bum kernel pointer, or a pte which
	 * points to a non existant page in ram, we will run this code
	 * _forever_ and lock up the machine!!!!! So we must check for
	 * this condition, the AC_SYNC_ERR bits are what we must examine.
	 * Also a parity error would make this happen as well.  So we just
	 * check that we are in fact servicing a tlb miss and not some
	 * other type of fault for the kernel.
	 */
	andcc	%l6, 0x80, %g0
	be	sun4c_fault_fromuser
	 and	%l5, %l4, %l5

	/* Test for NULL pte_t * in vmalloc area. */
	sethi   %hi(VMALLOC_START), %l4
	cmp     %l5, %l4
	blu,a   invalid_segment_patch1
	 lduXa	[%l5] ASI_SEGMAP, %l4

	sethi   %hi(swapper_pg_dir), %l4
	srl     %l5, SUN4C_PGDIR_SHIFT, %l6
	or      %l4, %lo(swapper_pg_dir), %l4
	sll     %l6, 2, %l6
	ld      [%l4 + %l6], %l4
#ifdef CONFIG_SUN4
	sethi	%hi(PAGE_MASK), %l6
	andcc	%l4, %l6, %g0
#else
	andcc   %l4, PAGE_MASK, %g0
#endif
	be      sun4c_fault_fromuser
	 lduXa  [%l5] ASI_SEGMAP, %l4

invalid_segment_patch1:
	cmp	%l4, 0x7f
	bne	1f
	 sethi	%hi(sun4c_kfree_ring), %l4
	or	%l4, %lo(sun4c_kfree_ring), %l4
	ld	[%l4 + 0x18], %l3
	deccc	%l3			! do we have a free entry?
	bcs,a	2f			! no, unmap one.
	 sethi	%hi(sun4c_kernel_ring), %l4

	st	%l3, [%l4 + 0x18]	! sun4c_kfree_ring.num_entries--

	ld	[%l4 + 0x00], %l6	! entry = sun4c_kfree_ring.ringhd.next
	st	%l5, [%l6 + 0x08]	! entry->vaddr = address

	ld	[%l6 + 0x00], %l3	! next = entry->next
	ld	[%l6 + 0x04], %l7	! entry->prev

	st	%l7, [%l3 + 0x04]	! next->prev = entry->prev
	st	%l3, [%l7 + 0x00]	! entry->prev->next = next

	sethi	%hi(sun4c_kernel_ring), %l4
	or	%l4, %lo(sun4c_kernel_ring), %l4
					! head = &sun4c_kernel_ring.ringhd

	ld	[%l4 + 0x00], %l7	! head->next

	st	%l4, [%l6 + 0x04]	! entry->prev = head
	st	%l7, [%l6 + 0x00]	! entry->next = head->next
	st	%l6, [%l7 + 0x04]	! head->next->prev = entry

	st	%l6, [%l4 + 0x00]	! head->next = entry

	ld	[%l4 + 0x18], %l3
	inc	%l3			! sun4c_kernel_ring.num_entries++
	st	%l3, [%l4 + 0x18]
	b	4f
	 ld	[%l6 + 0x08], %l5

2:
	or	%l4, %lo(sun4c_kernel_ring), %l4
					! head = &sun4c_kernel_ring.ringhd

	ld	[%l4 + 0x04], %l6	! entry = head->prev

	ld	[%l6 + 0x08], %l3	! tmp = entry->vaddr

	! Flush segment from the cache.
#ifdef CONFIG_SUN4
	sethi	%hi((128 * 1024)), %l7
#else
	sethi	%hi((64 * 1024)), %l7
#endif
9:
vac_hwflush_patch1:
vac_linesize_patch:
	subcc	%l7, 16, %l7
	bne	9b
vac_hwflush_patch2:
	 sta	%g0, [%l3 + %l7] ASI_FLUSHSEG

	st	%l5, [%l6 + 0x08]	! entry->vaddr = address

	ld	[%l6 + 0x00], %l5	! next = entry->next
	ld	[%l6 + 0x04], %l7	! entry->prev

	st	%l7, [%l5 + 0x04]	! next->prev = entry->prev
	st	%l5, [%l7 + 0x00]	! entry->prev->next = next
	st	%l4, [%l6 + 0x04]	! entry->prev = head

	ld	[%l4 + 0x00], %l7	! head->next

	st	%l7, [%l6 + 0x00]	! entry->next = head->next
	st	%l6, [%l7 + 0x04]	! head->next->prev = entry
	st	%l6, [%l4 + 0x00]	! head->next = entry

	mov	%l3, %l5		! address = tmp

4:
num_context_patch1:
	mov	0x08, %l7

	ld	[%l6 + 0x08], %l4
	ldub	[%l6 + 0x0c], %l3
	or	%l4, %l3, %l4		! encode new vaddr/pseg into l4

	sethi	%hi(AC_CONTEXT), %l3
	lduba	[%l3] ASI_CONTROL, %l6

	/* Invalidate old mapping, instantiate new mapping,
	 * for each context.  Registers l6/l7 are live across
	 * this loop.
	 */
3:	deccc	%l7
	sethi	%hi(AC_CONTEXT), %l3
	stba	%l7, [%l3] ASI_CONTROL
invalid_segment_patch2:
	mov	0x7f, %l3
	stXa	%l3, [%l5] ASI_SEGMAP
	andn	%l4, 0x1ff, %l3
	bne	3b
	 stXa	%l4, [%l3] ASI_SEGMAP

	sethi	%hi(AC_CONTEXT), %l3
	stba	%l6, [%l3] ASI_CONTROL

	andn	%l4, 0x1ff, %l5

1:
	sethi	%hi(VMALLOC_START), %l4
	cmp	%l5, %l4

	bgeu	1f
	 mov	1 << (SUN4C_REAL_PGDIR_SHIFT - PAGE_SHIFT), %l7

	sethi	%hi(KERNBASE), %l6

	sub	%l5, %l6, %l4
	srl	%l4, PAGE_SHIFT, %l4
	sethi	%hi((SUN4C_PAGE_KERNEL & 0xf4000000)), %l3
	or	%l3, %l4, %l3

	sethi	%hi(PAGE_SIZE), %l4

2:
	sta	%l3, [%l5] ASI_PTE
	deccc	%l7
	inc	%l3
	bne	2b
	 add	%l5, %l4, %l5

	b	7f
	 sethi	%hi(sun4c_kernel_faults), %l4

1:
	srl	%l5, SUN4C_PGDIR_SHIFT, %l3
	sethi	%hi(swapper_pg_dir), %l4
	or	%l4, %lo(swapper_pg_dir), %l4
	sll	%l3, 2, %l3
	ld	[%l4 + %l3], %l4
#ifndef CONFIG_SUN4
	and	%l4, PAGE_MASK, %l4
#else
	sethi	%hi(PAGE_MASK), %l6
	and	%l4, %l6, %l4
#endif

	srl	%l5, (PAGE_SHIFT - 2), %l6
	and	%l6, ((SUN4C_PTRS_PER_PTE - 1) << 2), %l6
	add	%l6, %l4, %l6

	sethi	%hi(PAGE_SIZE), %l4

2:
	ld	[%l6], %l3
	deccc	%l7
	sta	%l3, [%l5] ASI_PTE
	add	%l6, 0x4, %l6
	bne	2b
	 add	%l5, %l4, %l5

	sethi	%hi(sun4c_kernel_faults), %l4
7:
	ld	[%l4 + %lo(sun4c_kernel_faults)], %l3
	inc	%l3
	st	%l3, [%l4 + %lo(sun4c_kernel_faults)]

	/* Restore condition codes */
	wr	%l0, 0x0, %psr
	WRITE_PAUSE
	jmp	%l1
	 rett	%l2

sun4c_fault_fromuser:
	SAVE_ALL
	 nop
	
	mov	%l7, %o1		! Decode the info from %l7
	mov	%l7, %o2
	and	%o1, 1, %o1		! arg2 = text_faultp
	mov	%l7, %o3
	and	%o2, 2, %o2		! arg3 = writep
	andn	%o3, 0xfff, %o3		! arg4 = faulting address

	wr	%l0, PSR_ET, %psr
	WRITE_PAUSE

	call	do_sun4c_fault
	 add	%sp, STACKFRAME_SZ, %o0	! arg1 = pt_regs ptr

	RESTORE_ALL

	.align	4
	.globl	srmmu_fault
srmmu_fault:
	mov	0x400, %l5
	mov	0x300, %l4

	lda	[%l5] ASI_M_MMUREGS, %l6	! read sfar first
	lda	[%l4] ASI_M_MMUREGS, %l5	! read sfsr last

	andn	%l6, 0xfff, %l6
	srl	%l5, 6, %l5			! and encode all info into l7

	and	%l5, 2, %l5
	or	%l5, %l6, %l6

	or	%l6, %l7, %l7			! l7 = [addr,write,txtfault]

	SAVE_ALL

	mov	%l7, %o1
	mov	%l7, %o2
	and	%o1, 1, %o1		! arg2 = text_faultp
	mov	%l7, %o3
	and	%o2, 2, %o2		! arg3 = writep
	andn	%o3, 0xfff, %o3		! arg4 = faulting address

	wr	%l0, PSR_ET, %psr
	WRITE_PAUSE

	call	do_sparc_fault
	 add	%sp, STACKFRAME_SZ, %o0	! arg1 = pt_regs ptr

	RESTORE_ALL

	.align	4
	.globl	sys_nis_syscall
sys_nis_syscall:
	mov	%o7, %l5
	add	%sp, STACKFRAME_SZ, %o0		! pt_regs *regs arg
	call	c_sys_nis_syscall
	 mov	%l5, %o7

	.align	4
	.globl	sys_execve
sys_execve:
	mov	%o7, %l5
	add	%sp, STACKFRAME_SZ, %o0		! pt_regs *regs arg
	call	sparc_execve
	 mov	%l5, %o7

	.globl	sunos_execv
sunos_execv:
	st	%g0, [%sp + STACKFRAME_SZ + PT_I2]

	call	sparc_execve
	 add	%sp, STACKFRAME_SZ, %o0

	b	ret_sys_call
	 ld	[%sp + STACKFRAME_SZ + PT_I0], %o0

	.align	4
	.globl	sys_pipe
sys_pipe:
	mov	%o7, %l5
	add	%sp, STACKFRAME_SZ, %o0		! pt_regs *regs arg
	call	sparc_pipe
	 mov	%l5, %o7

	.align	4
	.globl	sys_sigaltstack
sys_sigaltstack:
	mov	%o7, %l5
	mov	%fp, %o2
	call	do_sigaltstack
	 mov	%l5, %o7

	.align	4
	.globl	sys_sigstack
sys_sigstack:
	mov	%o7, %l5
	mov	%fp, %o2
	call	do_sys_sigstack
	 mov	%l5, %o7

	.align	4
	.globl	sys_sigreturn
sys_sigreturn:
	call	do_sigreturn
	 add	%sp, STACKFRAME_SZ, %o0

	ld	[%curptr + TI_FLAGS], %l5
	andcc	%l5, _TIF_SYSCALL_TRACE, %g0
	be	1f
	 nop

	call	syscall_trace
	 nop

1:
	/* We don't want to muck with user registers like a
	 * normal syscall, just return.
	 */
	RESTORE_ALL

	.align	4
	.globl	sys_rt_sigreturn
sys_rt_sigreturn:
	call	do_rt_sigreturn
	 add	%sp, STACKFRAME_SZ, %o0

	ld	[%curptr + TI_FLAGS], %l5
	andcc	%l5, _TIF_SYSCALL_TRACE, %g0
	be	1f
	 nop

	call	syscall_trace
	 nop

1:
	/* We are returning to a signal handler. */
	RESTORE_ALL

	/* Now that we have a real sys_clone, sys_fork() is
	 * implemented in terms of it.  Our _real_ implementation
	 * of SunOS vfork() will use sys_vfork().
	 *
	 * XXX These three should be consolidated into mostly shared
	 * XXX code just like on sparc64... -DaveM
	 */
	.align	4
	.globl	sys_fork, flush_patch_two
sys_fork:
	mov	%o7, %l5
flush_patch_two:
	FLUSH_ALL_KERNEL_WINDOWS;
	ld	[%curptr + TI_TASK], %o4
	rd	%psr, %g4
	WRITE_PAUSE
	mov	SIGCHLD, %o0			! arg0:	clone flags
	rd	%wim, %g5
	WRITE_PAUSE
	mov	%fp, %o1			! arg1:	usp
	std	%g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
	add	%sp, STACKFRAME_SZ, %o2		! arg2:	pt_regs ptr
	mov	0, %o3
	call	sparc_do_fork
	 mov	%l5, %o7

	/* Whee, kernel threads! */
	.globl	sys_clone, flush_patch_three
sys_clone:
	mov	%o7, %l5
flush_patch_three:
	FLUSH_ALL_KERNEL_WINDOWS;
	ld	[%curptr + TI_TASK], %o4
	rd	%psr, %g4
	WRITE_PAUSE

	/* arg0,1: flags,usp  -- loaded already */
	cmp	%o1, 0x0			! Is new_usp NULL?
	rd	%wim, %g5
	WRITE_PAUSE
	be,a	1f
	 mov	%fp, %o1			! yes, use callers usp
	andn	%o1, 7, %o1			! no, align to 8 bytes
1:
	std	%g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
	add	%sp, STACKFRAME_SZ, %o2		! arg2:	pt_regs ptr
	mov	0, %o3
	call	sparc_do_fork
	 mov	%l5, %o7

	/* Whee, real vfork! */
	.globl	sys_vfork, flush_patch_four
sys_vfork:
flush_patch_four:
	FLUSH_ALL_KERNEL_WINDOWS;
	ld	[%curptr + TI_TASK], %o4
	rd	%psr, %g4
	WRITE_PAUSE
	rd	%wim, %g5
	WRITE_PAUSE
	std	%g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
	sethi	%hi(0x4000 | 0x0100 | SIGCHLD), %o0
	mov	%fp, %o1
	or	%o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
	sethi	%hi(sparc_do_fork), %l1
	mov	0, %o3
	jmpl	%l1 + %lo(sparc_do_fork), %g0
	 add	%sp, STACKFRAME_SZ, %o2

        .align  4
linux_sparc_ni_syscall:
	sethi   %hi(sys_ni_syscall), %l7
	b       syscall_is_too_hard
	 or     %l7, %lo(sys_ni_syscall), %l7

linux_fast_syscall:
	andn	%l7, 3, %l7
	mov	%i0, %o0
	mov	%i1, %o1
	mov 	%i2, %o2
	jmpl	%l7 + %g0, %g0
	 mov	%i3, %o3

linux_syscall_trace:
	call	syscall_trace
	 nop
	mov	%i0, %o0
	mov	%i1, %o1
	mov	%i2, %o2
	mov	%i3, %o3
	b	2f
	 mov	%i4, %o4

	.globl	ret_from_fork
ret_from_fork:
	call	schedule_tail
	 mov	%g3, %o0
	b	ret_sys_call
	 ld	[%sp + STACKFRAME_SZ + PT_I0], %o0

	/* Linux native system calls enter here... */
	.align	4
	.globl	linux_sparc_syscall
linux_sparc_syscall:
	sethi	%hi(PSR_SYSCALL), %l4
	or	%l0, %l4, %l0
	/* Direct access to user regs, must faster. */
	cmp	%g1, NR_SYSCALLS
	bgeu	linux_sparc_ni_syscall
	 sll	%g1, 2, %l4
	ld	[%l7 + %l4], %l7
	andcc	%l7, 1, %g0
	bne	linux_fast_syscall
	 /* Just do first insn from SAVE_ALL in the delay slot */

syscall_is_too_hard:
	SAVE_ALL_HEAD
	 rd	%wim, %l3

	wr	%l0, PSR_ET, %psr
	mov	%i0, %o0
	mov	%i1, %o1
	mov	%i2, %o2

	ld	[%curptr + TI_FLAGS], %l5
	mov	%i3, %o3
	andcc	%l5, _TIF_SYSCALL_TRACE, %g0
	mov	%i4, %o4
	bne	linux_syscall_trace
	 mov	%i0, %l5
2:
	call	%l7
	 mov	%i5, %o5

	st	%o0, [%sp + STACKFRAME_SZ + PT_I0]

ret_sys_call:
	ld	[%curptr + TI_FLAGS], %l6
	cmp	%o0, -ERESTART_RESTARTBLOCK
	ld	[%sp + STACKFRAME_SZ + PT_PSR], %g3
	set	PSR_C, %g2
	bgeu	1f
	 andcc	%l6, _TIF_SYSCALL_TRACE, %g0

	/* System call success, clear Carry condition code. */
	andn	%g3, %g2, %g3
	clr	%l6
	st	%g3, [%sp + STACKFRAME_SZ + PT_PSR]	
	bne	linux_syscall_trace2
	 ld	[%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
	add	%l1, 0x4, %l2			/* npc = npc+4 */
	st	%l1, [%sp + STACKFRAME_SZ + PT_PC]
	b	ret_trap_entry
	 st	%l2, [%sp + STACKFRAME_SZ + PT_NPC]
1:
	/* System call failure, set Carry condition code.
	 * Also, get abs(errno) to return to the process.
	 */
	sub	%g0, %o0, %o0
	or	%g3, %g2, %g3
	st	%o0, [%sp + STACKFRAME_SZ + PT_I0]
	mov	1, %l6
	st	%g3, [%sp + STACKFRAME_SZ + PT_PSR]
	bne	linux_syscall_trace2
	 ld	[%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
	add	%l1, 0x4, %l2			/* npc = npc+4 */
	st	%l1, [%sp + STACKFRAME_SZ + PT_PC]
	b	ret_trap_entry
	 st	%l2, [%sp + STACKFRAME_SZ + PT_NPC]

linux_syscall_trace2:
	call	syscall_trace
	 add	%l1, 0x4, %l2			/* npc = npc+4 */
	st	%l1, [%sp + STACKFRAME_SZ + PT_PC]
	b	ret_trap_entry
	 st	%l2, [%sp + STACKFRAME_SZ + PT_NPC]


/* Saving and restoring the FPU state is best done from lowlevel code.
 *
 * void fpsave(unsigned long *fpregs, unsigned long *fsr,
 *             void *fpqueue, unsigned long *fpqdepth)
 */

	.globl	fpsave
fpsave:
	st	%fsr, [%o1]	! this can trap on us if fpu is in bogon state
	ld	[%o1], %g1
	set	0x2000, %g4
	andcc	%g1, %g4, %g0
	be	2f
	 mov	0, %g2

	/* We have an fpqueue to save. */
1:
	std	%fq, [%o2]
fpsave_magic:
	st	%fsr, [%o1]
	ld	[%o1], %g3
	andcc	%g3, %g4, %g0
	add	%g2, 1, %g2
	bne	1b
	 add	%o2, 8, %o2

2:
	st	%g2, [%o3]

	std	%f0, [%o0 + 0x00]
	std	%f2, [%o0 + 0x08]
	std	%f4, [%o0 + 0x10]
	std	%f6, [%o0 + 0x18]
	std	%f8, [%o0 + 0x20]
	std	%f10, [%o0 + 0x28]
	std	%f12, [%o0 + 0x30]
	std	%f14, [%o0 + 0x38]
	std	%f16, [%o0 + 0x40]
	std	%f18, [%o0 + 0x48]
	std	%f20, [%o0 + 0x50]
	std	%f22, [%o0 + 0x58]
	std	%f24, [%o0 + 0x60]
	std	%f26, [%o0 + 0x68]
	std	%f28, [%o0 + 0x70]
	retl
	 std	%f30, [%o0 + 0x78]

	/* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
	 * code for pointing out this possible deadlock, while we save state
	 * above we could trap on the fsr store so our low level fpu trap
	 * code has to know how to deal with this.
	 */
fpsave_catch:
	b	fpsave_magic + 4
	 st	%fsr, [%o1]

fpsave_catch2:
	b	fpsave + 4
	 st	%fsr, [%o1]

	/* void fpload(unsigned long *fpregs, unsigned long *fsr); */

	.globl	fpload
fpload:
	ldd	[%o0 + 0x00], %f0
	ldd	[%o0 + 0x08], %f2
	ldd	[%o0 + 0x10], %f4
	ldd	[%o0 + 0x18], %f6
	ldd	[%o0 + 0x20], %f8
	ldd	[%o0 + 0x28], %f10
	ldd	[%o0 + 0x30], %f12
	ldd	[%o0 + 0x38], %f14
	ldd	[%o0 + 0x40], %f16
	ldd	[%o0 + 0x48], %f18
	ldd	[%o0 + 0x50], %f20
	ldd	[%o0 + 0x58], %f22
	ldd	[%o0 + 0x60], %f24
	ldd	[%o0 + 0x68], %f26
	ldd	[%o0 + 0x70], %f28
	ldd	[%o0 + 0x78], %f30
	ld	[%o1], %fsr
	retl
	 nop

	/* __ndelay and __udelay take two arguments:
	 * 0 - nsecs or usecs to delay
	 * 1 - per_cpu udelay_val (loops per jiffy)
	 *
	 * Note that ndelay gives HZ times higher resolution but has a 10ms
	 * limit.  udelay can handle up to 1s.
	 */
	.globl	__ndelay
__ndelay:
	save	%sp, -STACKFRAME_SZ, %sp
	mov	%i0, %o0
	call	.umul			! round multiplier up so large ns ok
	 mov	0x1ae, %o1		! 2**32 / (1 000 000 000 / HZ)
	call	.umul
	 mov	%i1, %o1		! udelay_val
	ba	delay_continue
	 mov	%o1, %o0		! >>32 later for better resolution

	.globl	__udelay
__udelay:
	save	%sp, -STACKFRAME_SZ, %sp
	mov	%i0, %o0
	sethi	%hi(0x10c7), %o1	! round multiplier up so large us ok
	call	.umul
	 or	%o1, %lo(0x10c7), %o1	! 2**32 / 1 000 000
	call	.umul
	 mov	%i1, %o1		! udelay_val
	sethi	%hi(0x028f4b62), %l0	! Add in rounding constant * 2**32,
	or	%g0, %lo(0x028f4b62), %l0
	addcc	%o0, %l0, %o0		! 2**32 * 0.009 999
	bcs,a	3f
	 add	%o1, 0x01, %o1
3:
	call	.umul
	 mov	HZ, %o0			! >>32 earlier for wider range

delay_continue:
	cmp	%o0, 0x0
1:
	bne	1b
	 subcc	%o0, 1, %o0
	
	ret
	restore

	/* Handle a software breakpoint */
	/* We have to inform parent that child has stopped */
	.align 4
	.globl breakpoint_trap
breakpoint_trap:
	rd	%wim,%l3
	SAVE_ALL
	wr 	%l0, PSR_ET, %psr
	WRITE_PAUSE

	st	%i0, [%sp + STACKFRAME_SZ + PT_G0] ! for restarting syscalls
	call	sparc_breakpoint
	 add	%sp, STACKFRAME_SZ, %o0

	RESTORE_ALL

#ifdef CONFIG_KGDB
	.align	4
	.globl	kgdb_trap_low
	.type	kgdb_trap_low,#function
kgdb_trap_low:
	rd	%wim,%l3
	SAVE_ALL
	wr 	%l0, PSR_ET, %psr
	WRITE_PAUSE

	call	kgdb_trap
	 add	%sp, STACKFRAME_SZ, %o0

	RESTORE_ALL
	.size	kgdb_trap_low,.-kgdb_trap_low
#endif

	.align	4
	.globl	flush_patch_exception
flush_patch_exception:
	FLUSH_ALL_KERNEL_WINDOWS;
	ldd	[%o0], %o6
	jmpl	%o7 + 0xc, %g0			! see asm-sparc/processor.h
	 mov	1, %g1				! signal EFAULT condition

	.align	4
	.globl	kill_user_windows, kuw_patch1_7win
	.globl	kuw_patch1
kuw_patch1_7win:	sll	%o3, 6, %o3

	/* No matter how much overhead this routine has in the worst
	 * case scenerio, it is several times better than taking the
	 * traps with the old method of just doing flush_user_windows().
	 */
kill_user_windows:
	ld	[%g6 + TI_UWINMASK], %o0	! get current umask
	orcc	%g0, %o0, %g0			! if no bits set, we are done
	be	3f				! nothing to do
	 rd	%psr, %o5			! must clear interrupts
	or	%o5, PSR_PIL, %o4		! or else that could change
	wr	%o4, 0x0, %psr			! the uwinmask state
	WRITE_PAUSE				! burn them cycles
1:
	ld	[%g6 + TI_UWINMASK], %o0	! get consistent state
	orcc	%g0, %o0, %g0			! did an interrupt come in?
	be	4f				! yep, we are done
	 rd	%wim, %o3			! get current wim
	srl	%o3, 1, %o4			! simulate a save
kuw_patch1:
	sll	%o3, 7, %o3			! compute next wim
	or	%o4, %o3, %o3			! result
	andncc	%o0, %o3, %o0			! clean this bit in umask
	bne	kuw_patch1			! not done yet
	 srl	%o3, 1, %o4			! begin another save simulation
	wr	%o3, 0x0, %wim			! set the new wim
	st	%g0, [%g6 + TI_UWINMASK]	! clear uwinmask
4:
	wr	%o5, 0x0, %psr			! re-enable interrupts
	WRITE_PAUSE				! burn baby burn
3:
	retl					! return
	 st	%g0, [%g6 + TI_W_SAVED]		! no windows saved

	.align	4
	.globl	restore_current
restore_current:
	LOAD_CURRENT(g6, o0)
	retl
	 nop

#ifdef CONFIG_PCI
#include <asm/pcic.h>

	.align	4
	.globl	linux_trap_ipi15_pcic
linux_trap_ipi15_pcic:
	rd	%wim, %l3
	SAVE_ALL

	/*
	 * First deactivate NMI
	 * or we cannot drop ET, cannot get window spill traps.
	 * The busy loop is necessary because the PIO error
	 * sometimes does not go away quickly and we trap again.
	 */
	sethi	%hi(pcic_regs), %o1
	ld	[%o1 + %lo(pcic_regs)], %o2

	! Get pending status for printouts later.
	ld	[%o2 + PCI_SYS_INT_PENDING], %o0

	mov	PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
	stb	%o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
1:
	ld	[%o2 + PCI_SYS_INT_PENDING], %o1
	andcc	%o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
	bne	1b
	 nop

	or	%l0, PSR_PIL, %l4
	wr	%l4, 0x0, %psr
	WRITE_PAUSE
	wr	%l4, PSR_ET, %psr
	WRITE_PAUSE

	call	pcic_nmi
	 add	%sp, STACKFRAME_SZ, %o1	! struct pt_regs *regs
	RESTORE_ALL

	.globl	pcic_nmi_trap_patch
pcic_nmi_trap_patch:
	sethi	%hi(linux_trap_ipi15_pcic), %l3
	jmpl	%l3 + %lo(linux_trap_ipi15_pcic), %g0
	 rd	%psr, %l0
	.word	0

#endif /* CONFIG_PCI */

	.globl	flushw_all
flushw_all:
	save	%sp, -0x40, %sp
	save	%sp, -0x40, %sp
	save	%sp, -0x40, %sp
	save	%sp, -0x40, %sp
	save	%sp, -0x40, %sp
	save	%sp, -0x40, %sp
	save	%sp, -0x40, %sp
	restore
	restore
	restore
	restore
	restore
	restore
	ret
	 restore

/* End of entry.S */
OpenPOWER on IntegriCloud