aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/kernel/entry64.S
blob: f33658f09dd7ef97262ce6abc01d3d1833a461f4 (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
/*
 *  arch/s390/kernel/entry64.S
 *    S390 low-level entry points.
 *
 *    Copyright (C) IBM Corp. 1999,2006
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *		 Hartmut Penner (hp@de.ibm.com),
 *		 Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
 */

#include <linux/sys.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/cache.h>
#include <asm/lowcore.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
#include <asm/page.h>

/*
 * Stack layout for the system_call stack entry.
 * The first few entries are identical to the user_regs_struct.
 */
SP_PTREGS    =	STACK_FRAME_OVERHEAD
SP_ARGS      =	STACK_FRAME_OVERHEAD + __PT_ARGS
SP_PSW	     =	STACK_FRAME_OVERHEAD + __PT_PSW
SP_R0	     =	STACK_FRAME_OVERHEAD + __PT_GPRS
SP_R1	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 8
SP_R2	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 16
SP_R3	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 24
SP_R4	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 32
SP_R5	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 40
SP_R6	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 48
SP_R7	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 56
SP_R8	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 64
SP_R9	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 72
SP_R10	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 80
SP_R11	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 88
SP_R12	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 96
SP_R13	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 104
SP_R14	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 112
SP_R15	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 120
SP_ORIG_R2   =	STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
SP_ILC	     =	STACK_FRAME_OVERHEAD + __PT_ILC
SP_SVCNR      =	STACK_FRAME_OVERHEAD + __PT_SVCNR
SP_SIZE      =	STACK_FRAME_OVERHEAD + __PT_SIZE

STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE  = 1 << STACK_SHIFT

_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
		 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
		 _TIF_MCCK_PENDING)
_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
		_TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8)

#define BASED(name) name-system_call(%r13)

#ifdef CONFIG_TRACE_IRQFLAGS
	.macro	TRACE_IRQS_ON
	 basr	%r2,%r0
	 brasl	%r14,trace_hardirqs_on_caller
	.endm

	.macro	TRACE_IRQS_OFF
	 basr	%r2,%r0
	 brasl	%r14,trace_hardirqs_off_caller
	.endm

	.macro TRACE_IRQS_CHECK
	basr	%r2,%r0
	tm	SP_PSW(%r15),0x03	# irqs enabled?
	jz	0f
	brasl	%r14,trace_hardirqs_on_caller
	j	1f
0:	brasl	%r14,trace_hardirqs_off_caller
1:
	.endm
#else
#define TRACE_IRQS_ON
#define TRACE_IRQS_OFF
#define TRACE_IRQS_CHECK
#endif

#ifdef CONFIG_LOCKDEP
	.macro	LOCKDEP_SYS_EXIT
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
	jz	0f
	brasl	%r14,lockdep_sys_exit
0:
	.endm
#else
#define LOCKDEP_SYS_EXIT
#endif

	.macro	UPDATE_VTIME lc_from,lc_to,lc_sum
	lg	%r10,\lc_from
	slg	%r10,\lc_to
	alg	%r10,\lc_sum
	stg	%r10,\lc_sum
	.endm

/*
 * Register usage in interrupt handlers:
 *    R9  - pointer to current task structure
 *    R13 - pointer to literal pool
 *    R14 - return register for function calls
 *    R15 - kernel stack pointer
 */

	.macro	SAVE_ALL_BASE savearea
	stmg	%r12,%r15,\savearea
	larl	%r13,system_call
	.endm

	.macro	SAVE_ALL_SVC psworg,savearea
	la	%r12,\psworg
	lg	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
	.endm

	.macro	SAVE_ALL_SYNC psworg,savearea
	la	%r12,\psworg
	tm	\psworg+1,0x01		# test problem state bit
	jz	2f			# skip stack setup save
	lg	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
#ifdef CONFIG_CHECK_STACK
	j	3f
2:	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
	jz	stack_overflow
3:
#endif
2:
	.endm

	.macro	SAVE_ALL_ASYNC psworg,savearea
	la	%r12,\psworg
	tm	\psworg+1,0x01		# test problem state bit
	jnz	1f			# from user -> load kernel stack
	clc	\psworg+8(8),BASED(.Lcritical_end)
	jhe	0f
	clc	\psworg+8(8),BASED(.Lcritical_start)
	jl	0f
	brasl	%r14,cleanup_critical
	tm	1(%r12),0x01		# retest problem state after cleanup
	jnz	1f
0:	lg	%r14,__LC_ASYNC_STACK	# are we already on the async. stack ?
	slgr	%r14,%r15
	srag	%r14,%r14,STACK_SHIFT
	jz	2f
1:	lg	%r15,__LC_ASYNC_STACK	# load async stack
#ifdef CONFIG_CHECK_STACK
	j	3f
2:	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
	jz	stack_overflow
3:
#endif
2:
	.endm

	.macro	CREATE_STACK_FRAME psworg,savearea
	aghi	%r15,-SP_SIZE		# make room for registers & psw
	mvc	SP_PSW(16,%r15),0(%r12)	# move user PSW to stack
	stg	%r2,SP_ORIG_R2(%r15)	# store original content of gpr 2
	icm	%r12,3,__LC_SVC_ILC
	stmg	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
	st	%r12,SP_SVCNR(%r15)
	mvc	SP_R12(32,%r15),\savearea # move %r12-%r15 to stack
	la	%r12,0
	stg	%r12,__SF_BACKCHAIN(%r15)
	.endm

	.macro	RESTORE_ALL psworg,sync
	mvc	\psworg(16),SP_PSW(%r15) # move user PSW to lowcore
	.if !\sync
	ni	\psworg+1,0xfd		# clear wait state bit
	.endif
	lg	%r14,__LC_VDSO_PER_CPU
	lmg	%r0,%r13,SP_R0(%r15)	# load gprs 0-13 of user
	stpt	__LC_EXIT_TIMER
	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
	lmg	%r14,%r15,SP_R14(%r15)	# load grps 14-15 of user
	lpswe	\psworg			# back to caller
	.endm

/*
 * Scheduler resume function, called by switch_to
 *  gpr2 = (task_struct *) prev
 *  gpr3 = (task_struct *) next
 * Returns:
 *  gpr2 = prev
 */
	.globl	__switch_to
__switch_to:
	tm	__THREAD_per+4(%r3),0xe8 # is the new process using per ?
	jz	__switch_to_noper		# if not we're fine
	stctg	%c9,%c11,__SF_EMPTY(%r15)# We are using per stuff
	clc	__THREAD_per(24,%r3),__SF_EMPTY(%r15)
	je	__switch_to_noper	     # we got away without bashing TLB's
	lctlg	%c9,%c11,__THREAD_per(%r3)	# Nope we didn't
__switch_to_noper:
	lg	%r4,__THREAD_info(%r2)		    # get thread_info of prev
	tm	__TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
	jz	__switch_to_no_mcck
	ni	__TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
	lg	%r4,__THREAD_info(%r3)		    # get thread_info of next
	oi	__TI_flags+7(%r4),_TIF_MCCK_PENDING # set it in next
__switch_to_no_mcck:
	stmg	%r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
	stg	%r15,__THREAD_ksp(%r2)	# store kernel stack to prev->tss.ksp
	lg	%r15,__THREAD_ksp(%r3)	# load kernel stack from next->tss.ksp
	lmg	%r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
	stg	%r3,__LC_CURRENT	# __LC_CURRENT = current task struct
	lctl	%c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
	lg	%r3,__THREAD_info(%r3)	# load thread_info from task struct
	stg	%r3,__LC_THREAD_INFO
	aghi	%r3,STACK_SIZE
	stg	%r3,__LC_KERNEL_STACK	# __LC_KERNEL_STACK = new kernel stack
	br	%r14

__critical_start:
/*
 * SVC interrupt handler routine. System calls are synchronous events and
 * are executed with interrupts enabled.
 */

	.globl	system_call
system_call:
	stpt	__LC_SYNC_ENTER_TIMER
sysc_saveall:
	SAVE_ALL_BASE __LC_SAVE_AREA
	SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	llgh	%r7,__LC_SVC_INT_CODE	# get svc number from lowcore
sysc_vtime:
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
sysc_stime:
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
sysc_update:
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
sysc_do_svc:
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	ltgr	%r7,%r7		# test for svc 0
	jnz	sysc_nr_ok
	# svc 0: system call number in %r1
	cl	%r1,BASED(.Lnr_syscalls)
	jnl	sysc_nr_ok
	lgfr	%r7,%r1 	# clear high word in r1
sysc_nr_ok:
	mvc	SP_ARGS(8,%r15),SP_R7(%r15)
sysc_do_restart:
	sth	%r7,SP_SVCNR(%r15)
	sllg	%r7,%r7,2	# svc number * 4
	larl	%r10,sys_call_table
#ifdef CONFIG_COMPAT
	tm	__TI_flags+5(%r9),(_TIF_31BIT>>16)  # running in 31 bit mode ?
	jno	sysc_noemu
	larl	%r10,sys_call_table_emu  # use 31 bit emulation system calls
sysc_noemu:
#endif
	tm	__TI_flags+6(%r9),_TIF_SYSCALL
	lgf	%r8,0(%r7,%r10) # load address of system call routine
	jnz	sysc_tracesys
	basr	%r14,%r8	# call sys_xxxx
	stg	%r2,SP_R2(%r15) # store return value (change R2 on stack)

sysc_return:
	tm	__TI_flags+7(%r9),_TIF_WORK_SVC
	jnz	sysc_work	# there is work to do (signals etc.)
sysc_restore:
#ifdef CONFIG_TRACE_IRQFLAGS
	larl	%r1,sysc_restore_trace_psw
	lpswe	0(%r1)
sysc_restore_trace:
	TRACE_IRQS_CHECK
	LOCKDEP_SYS_EXIT
#endif
sysc_leave:
	RESTORE_ALL __LC_RETURN_PSW,1
sysc_done:

#ifdef CONFIG_TRACE_IRQFLAGS
	.section .data,"aw",@progbits
	.align	8
	.globl sysc_restore_trace_psw
sysc_restore_trace_psw:
	.quad	0, sysc_restore_trace
	.previous
#endif

#
# recheck if there is more work to do
#
sysc_work_loop:
	tm	__TI_flags+7(%r9),_TIF_WORK_SVC
	jz	sysc_restore	  # there is no work to do
#
# One of the work bits is on. Find out which one.
#
sysc_work:
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
	jno	sysc_restore
	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING
	jo	sysc_mcck_pending
	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
	jo	sysc_reschedule
	tm	__TI_flags+7(%r9),_TIF_SIGPENDING
	jnz	sysc_sigpending
	tm	__TI_flags+7(%r9),_TIF_NOTIFY_RESUME
	jnz	sysc_notify_resume
	tm	__TI_flags+7(%r9),_TIF_RESTART_SVC
	jo	sysc_restart
	tm	__TI_flags+7(%r9),_TIF_SINGLE_STEP
	jo	sysc_singlestep
	j	sysc_restore
sysc_work_done:

#
# _TIF_NEED_RESCHED is set, call schedule
#
sysc_reschedule:
	larl	%r14,sysc_work_loop
	jg	schedule	# return point is sysc_return

#
# _TIF_MCCK_PENDING is set, call handler
#
sysc_mcck_pending:
	larl	%r14,sysc_work_loop
	jg	s390_handle_mcck	# TIF bit will be cleared by handler

#
# _TIF_SIGPENDING is set, call do_signal
#
sysc_sigpending:
	ni	__TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	brasl	%r14,do_signal		# call do_signal
	tm	__TI_flags+7(%r9),_TIF_RESTART_SVC
	jo	sysc_restart
	tm	__TI_flags+7(%r9),_TIF_SINGLE_STEP
	jo	sysc_singlestep
	j	sysc_work_loop

#
# _TIF_NOTIFY_RESUME is set, call do_notify_resume
#
sysc_notify_resume:
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	larl	%r14,sysc_work_loop
	jg	do_notify_resume	# call do_notify_resume

#
# _TIF_RESTART_SVC is set, set up registers and restart svc
#
sysc_restart:
	ni	__TI_flags+7(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
	lg	%r7,SP_R2(%r15)		# load new svc number
	mvc	SP_R2(8,%r15),SP_ORIG_R2(%r15) # restore first argument
	lmg	%r2,%r6,SP_R2(%r15)	# load svc arguments
	j	sysc_do_restart 	# restart svc

#
# _TIF_SINGLE_STEP is set, call do_single_step
#
sysc_singlestep:
	ni	__TI_flags+7(%r9),255-_TIF_SINGLE_STEP	# clear TIF_SINGLE_STEP
	xc	SP_SVCNR(2,%r15),SP_SVCNR(%r15)		# clear svc number
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	larl	%r14,sysc_return	# load adr. of system return
	jg	do_single_step		# branch to do_sigtrap

#
# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
# and after the system call
#
sysc_tracesys:
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	la	%r3,0
	srl	%r7,2
	stg	%r7,SP_R2(%r15)
	brasl	%r14,do_syscall_trace_enter
	lghi	%r0,NR_syscalls
	clgr	%r0,%r2
	jnh	sysc_tracenogo
	sllg	%r7,%r2,2		# svc number *4
	lgf	%r8,0(%r7,%r10)
sysc_tracego:
	lmg	%r3,%r6,SP_R3(%r15)
	lg	%r2,SP_ORIG_R2(%r15)
	basr	%r14,%r8		# call sys_xxx
	stg	%r2,SP_R2(%r15)		# store return value
sysc_tracenogo:
	tm	__TI_flags+6(%r9),_TIF_SYSCALL
	jz	sysc_return
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	larl	%r14,sysc_return	# return point is sysc_return
	jg	do_syscall_trace_exit

#
# a new process exits the kernel with ret_from_fork
#
	.globl	ret_from_fork
ret_from_fork:
	lg	%r13,__LC_SVC_NEW_PSW+8
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	tm	SP_PSW+1(%r15),0x01	# forking a kernel thread ?
	jo	0f
	stg	%r15,SP_R15(%r15)	# store stack pointer for new kthread
0:	brasl	%r14,schedule_tail
	TRACE_IRQS_ON
	stosm	24(%r15),0x03		# reenable interrupts
	j	sysc_tracenogo

#
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
#
	.globl	kernel_execve
kernel_execve:
	stmg	%r12,%r15,96(%r15)
	lgr	%r14,%r15
	aghi	%r15,-SP_SIZE
	stg	%r14,__SF_BACKCHAIN(%r15)
	la	%r12,SP_PTREGS(%r15)
	xc	0(__PT_SIZE,%r12),0(%r12)
	lgr	%r5,%r12
	brasl	%r14,do_execve
	ltgfr	%r2,%r2
	je	0f
	aghi	%r15,SP_SIZE
	lmg	%r12,%r15,96(%r15)
	br	%r14
	# execve succeeded.
0:	stnsm	__SF_EMPTY(%r15),0xfc	# disable interrupts
	lg	%r15,__LC_KERNEL_STACK	# load ksp
	aghi	%r15,-SP_SIZE		# make room for registers & psw
	lg	%r13,__LC_SVC_NEW_PSW+8
	lg	%r9,__LC_THREAD_INFO
	mvc	SP_PTREGS(__PT_SIZE,%r15),0(%r12)	# copy pt_regs
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	brasl	%r14,execve_tail
	j	sysc_return

/*
 * Program check handler routine
 */

	.globl	pgm_check_handler
pgm_check_handler:
/*
 * First we need to check for a special case:
 * Single stepping an instruction that disables the PER event mask will
 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
 * For a single stepped SVC the program check handler gets control after
 * the SVC new PSW has been loaded. But we want to execute the SVC first and
 * then handle the PER event. Therefore we update the SVC old PSW to point
 * to the pgm_check_handler and branch to the SVC handler after we checked
 * if we have to load the kernel stack register.
 * For every other possible cause for PER event without the PER mask set
 * we just ignore the PER event (FIXME: is there anything we have to do
 * for LPSW?).
 */
	stpt	__LC_SYNC_ENTER_TIMER
	SAVE_ALL_BASE __LC_SAVE_AREA
	tm	__LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
	jnz	pgm_per 		 # got per exception -> special case
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	pgm_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime:
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	mvc	SP_ARGS(8,%r15),__LC_LAST_BREAK
	TRACE_IRQS_OFF
	lgf	%r3,__LC_PGM_ILC	# load program interruption code
	lghi	%r8,0x7f
	ngr	%r8,%r3
pgm_do_call:
	sll	%r8,3
	larl	%r1,pgm_check_table
	lg	%r1,0(%r8,%r1)		# load address of handler routine
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	larl	%r14,sysc_return
	br	%r1			# branch to interrupt-handler

#
# handle per exception
#
pgm_per:
	tm	__LC_PGM_OLD_PSW,0x40	# test if per event recording is on
	jnz	pgm_per_std		# ok, normal per event from user space
# ok its one of the special cases, now we need to find out which one
	clc	__LC_PGM_OLD_PSW(16),__LC_SVC_NEW_PSW
	je	pgm_svcper
# no interesting special case, ignore PER event
	lmg	%r12,%r15,__LC_SAVE_AREA
	lpswe	__LC_PGM_OLD_PSW

#
# Normal per exception
#
pgm_per_std:
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	pgm_no_vtime2
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime2:
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	TRACE_IRQS_OFF
	lg	%r1,__TI_task(%r9)
	tm	SP_PSW+1(%r15),0x01	# kernel per event ?
	jz	kernel_per
	mvc	__THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
	mvc	__THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
	mvc	__THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
	oi	__TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
	lgf	%r3,__LC_PGM_ILC	# load program interruption code
	lghi	%r8,0x7f
	ngr	%r8,%r3			# clear per-event-bit and ilc
	je	sysc_return
	j	pgm_do_call

#
# it was a single stepped SVC that is causing all the trouble
#
pgm_svcper:
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
	llgh	%r7,__LC_SVC_INT_CODE	# get svc number from lowcore
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	lg	%r8,__TI_task(%r9)
	mvc	__THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
	mvc	__THREAD_per+__PER_address(8,%r8),__LC_PER_ADDRESS
	mvc	__THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
	oi	__TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
	TRACE_IRQS_ON
	lmg	%r2,%r6,SP_R2(%r15)	# load svc arguments
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	j	sysc_do_svc

#
# per was called from kernel, must be kprobes
#
kernel_per:
	xc	SP_SVCNR(2,%r15),SP_SVCNR(%r15)	# clear svc number
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	larl	%r14,sysc_restore	# load adr. of system ret, no work
	jg	do_single_step		# branch to do_single_step

/*
 * IO interrupt handler routine
 */
	.globl io_int_handler
io_int_handler:
	stck	__LC_INT_CLOCK
	stpt	__LC_ASYNC_ENTER_TIMER
	SAVE_ALL_BASE __LC_SAVE_AREA+32
	SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
	CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	io_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
io_no_vtime:
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	TRACE_IRQS_OFF
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	brasl	%r14,do_IRQ		# call standard irq handler
io_return:
	tm	__TI_flags+7(%r9),_TIF_WORK_INT
	jnz	io_work 		# there is work to do (signals etc.)
io_restore:
#ifdef CONFIG_TRACE_IRQFLAGS
	larl	%r1,io_restore_trace_psw
	lpswe	0(%r1)
io_restore_trace:
	TRACE_IRQS_CHECK
	LOCKDEP_SYS_EXIT
#endif
io_leave:
	RESTORE_ALL __LC_RETURN_PSW,0
io_done:

#ifdef CONFIG_TRACE_IRQFLAGS
	.section .data,"aw",@progbits
	.align	8
	.globl io_restore_trace_psw
io_restore_trace_psw:
	.quad	0, io_restore_trace
	.previous
#endif

#
# There is work todo, we need to check if we return to userspace, then
# check, if we are in SIE, if yes leave it
#
io_work:
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
#ifndef CONFIG_PREEMPT
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
	jnz	io_work_user		# yes -> no need to check for SIE
	la	%r1, BASED(sie_opcode)	# we return to kernel here
	lg	%r2, SP_PSW+8(%r15)
	clc	0(2,%r1), 0(%r2)	# is current instruction = SIE?
	jne	io_restore		# no-> return to kernel
	lg	%r1, SP_PSW+8(%r15)	# yes-> add 4 bytes to leave SIE
	aghi	%r1, 4
	stg	%r1, SP_PSW+8(%r15)
	j	io_restore		# return to kernel
#else
	jno	io_restore		# no-> skip resched & signal
#endif
#else
	jnz	io_work_user		# yes -> do resched & signal
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
	la	%r1, BASED(sie_opcode)
	lg	%r2, SP_PSW+8(%r15)
	clc	0(2,%r1), 0(%r2)	# is current instruction = SIE?
	jne	0f			# no -> leave PSW alone
	lg	%r1, SP_PSW+8(%r15)	# yes-> add 4 bytes to leave SIE
	aghi	%r1, 4
	stg	%r1, SP_PSW+8(%r15)
0:
#endif
	# check for preemptive scheduling
	icm	%r0,15,__TI_precount(%r9)
	jnz	io_restore		# preemption is disabled
	# switch to kernel stack
	lg	%r1,SP_R15(%r15)
	aghi	%r1,-SP_SIZE
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lgr	%r15,%r1
io_resume_loop:
	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
	jno	io_restore
	larl	%r14,io_resume_loop
	jg	preempt_schedule_irq
#endif

io_work_user:
	lg	%r1,__LC_KERNEL_STACK
	aghi	%r1,-SP_SIZE
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lgr	%r15,%r1
#
# One of the work bits is on. Find out which one.
# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGPENDING, _TIF_NEED_RESCHED
#	       and _TIF_MCCK_PENDING
#
io_work_loop:
	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING
	jo	io_mcck_pending
	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
	jo	io_reschedule
	tm	__TI_flags+7(%r9),_TIF_SIGPENDING
	jnz	io_sigpending
	tm	__TI_flags+7(%r9),_TIF_NOTIFY_RESUME
	jnz	io_notify_resume
	j	io_restore
io_work_done:

#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
sie_opcode:
	.long 0xb2140000
#endif

#
# _TIF_MCCK_PENDING is set, call handler
#
io_mcck_pending:
	brasl	%r14,s390_handle_mcck	# TIF bit will be cleared by handler
	j	io_work_loop

#
# _TIF_NEED_RESCHED is set, call schedule
#
io_reschedule:
	TRACE_IRQS_ON
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	brasl	%r14,schedule		# call scheduler
	stnsm	__SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
	TRACE_IRQS_OFF
	tm	__TI_flags+7(%r9),_TIF_WORK_INT
	jz	io_restore		# there is no work to do
	j	io_work_loop

#
# _TIF_SIGPENDING or is set, call do_signal
#
io_sigpending:
	TRACE_IRQS_ON
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	brasl	%r14,do_signal		# call do_signal
	stnsm	__SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
	TRACE_IRQS_OFF
	j	io_work_loop

#
# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
#
io_notify_resume:
	TRACE_IRQS_ON
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	brasl	%r14,do_notify_resume	# call do_notify_resume
	stnsm	__SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
	TRACE_IRQS_OFF
	j	io_work_loop

/*
 * External interrupt handler routine
 */
	.globl	ext_int_handler
ext_int_handler:
	stck	__LC_INT_CLOCK
	stpt	__LC_ASYNC_ENTER_TIMER
	SAVE_ALL_BASE __LC_SAVE_AREA+32
	SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
	CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	ext_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
ext_no_vtime:
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	TRACE_IRQS_OFF
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	llgh	%r3,__LC_EXT_INT_CODE	# get interruption code
	brasl	%r14,do_extint
	j	io_return

__critical_end:

/*
 * Machine check handler routines
 */
	.globl mcck_int_handler
mcck_int_handler:
	stck	__LC_INT_CLOCK
	la	%r1,4095		# revalidate r1
	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
	SAVE_ALL_BASE __LC_SAVE_AREA+64
	la	%r12,__LC_MCK_OLD_PSW
	tm	__LC_MCCK_CODE,0x80	# system damage?
	jo	mcck_int_main		# yes -> rest of mcck code invalid
	la	%r14,4095
	mvc	__LC_SAVE_AREA+104(8),__LC_ASYNC_ENTER_TIMER
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r14)
	tm	__LC_MCCK_CODE+5,0x02	# stored cpu timer value valid?
	jo	1f
	la	%r14,__LC_SYNC_ENTER_TIMER
	clc	0(8,%r14),__LC_ASYNC_ENTER_TIMER
	jl	0f
	la	%r14,__LC_ASYNC_ENTER_TIMER
0:	clc	0(8,%r14),__LC_EXIT_TIMER
	jl	0f
	la	%r14,__LC_EXIT_TIMER
0:	clc	0(8,%r14),__LC_LAST_UPDATE_TIMER
	jl	0f
	la	%r14,__LC_LAST_UPDATE_TIMER
0:	spt	0(%r14)
	mvc	__LC_ASYNC_ENTER_TIMER(8),0(%r14)
1:	tm	__LC_MCCK_CODE+2,0x09	# mwp + ia of old psw valid?
	jno	mcck_int_main		# no -> skip cleanup critical
	tm	__LC_MCK_OLD_PSW+1,0x01 # test problem state bit
	jnz	mcck_int_main		# from user -> load kernel stack
	clc	__LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_end)
	jhe	mcck_int_main
	clc	__LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_start)
	jl	mcck_int_main
	brasl	%r14,cleanup_critical
mcck_int_main:
	lg	%r14,__LC_PANIC_STACK	# are we already on the panic stack?
	slgr	%r14,%r15
	srag	%r14,%r14,PAGE_SHIFT
	jz	0f
	lg	%r15,__LC_PANIC_STACK	# load panic stack
0:	CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64
	tm	__LC_MCCK_CODE+2,0x08	# mwp of old psw valid?
	jno	mcck_no_vtime		# no -> no timer update
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	mcck_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
mcck_no_vtime:
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	brasl	%r14,s390_do_machine_check
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
	jno	mcck_return
	lg	%r1,__LC_KERNEL_STACK	# switch to kernel stack
	aghi	%r1,-SP_SIZE
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lgr	%r15,%r1
	stosm	__SF_EMPTY(%r15),0x04	# turn dat on
	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING
	jno	mcck_return
	TRACE_IRQS_OFF
	brasl	%r14,s390_handle_mcck
	TRACE_IRQS_ON
mcck_return:
	mvc	__LC_RETURN_MCCK_PSW(16),SP_PSW(%r15) # move return PSW
	ni	__LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
	lmg	%r0,%r15,SP_R0(%r15)	# load gprs 0-15
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+104
	tm	__LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
	jno	0f
	stpt	__LC_EXIT_TIMER
0:	lpswe	__LC_RETURN_MCCK_PSW	# back to caller

/*
 * Restart interruption handler, kick starter for additional CPUs
 */
#ifdef CONFIG_SMP
	__CPUINIT
	.globl restart_int_handler
restart_int_handler:
	basr	%r1,0
restart_base:
	spt	restart_vtime-restart_base(%r1)
	stck	__LC_LAST_UPDATE_CLOCK
	mvc	__LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
	mvc	__LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
	lg	%r15,__LC_SAVE_AREA+120 # load ksp
	lghi	%r10,__LC_CREGS_SAVE_AREA
	lctlg	%c0,%c15,0(%r10) # get new ctl regs
	lghi	%r10,__LC_AREGS_SAVE_AREA
	lam	%a0,%a15,0(%r10)
	lmg	%r6,%r15,__SF_GPRS(%r15) # load registers from clone
	lg	%r1,__LC_THREAD_INFO
	mvc	__LC_USER_TIMER(8),__TI_user_timer(%r1)
	mvc	__LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
	xc	__LC_STEAL_TIMER(8),__LC_STEAL_TIMER
	stosm	__SF_EMPTY(%r15),0x04	# now we can turn dat on
	jg	start_secondary
	.align	8
restart_vtime:
	.long	0x7fffffff,0xffffffff
	.previous
#else
/*
 * If we do not run with SMP enabled, let the new CPU crash ...
 */
	.globl restart_int_handler
restart_int_handler:
	basr	%r1,0
restart_base:
	lpswe	restart_crash-restart_base(%r1)
	.align 8
restart_crash:
	.long  0x000a0000,0x00000000,0x00000000,0x00000000
restart_go:
#endif

#ifdef CONFIG_CHECK_STACK
/*
 * The synchronous or the asynchronous stack overflowed. We are dead.
 * No need to properly save the registers, we are going to panic anyway.
 * Setup a pt_regs so that show_trace can provide a good call trace.
 */
stack_overflow:
	lg	%r15,__LC_PANIC_STACK	# change to panic stack
	aghi	%r15,-SP_SIZE
	mvc	SP_PSW(16,%r15),0(%r12)	# move user PSW to stack
	stmg	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
	la	%r1,__LC_SAVE_AREA
	chi	%r12,__LC_SVC_OLD_PSW
	je	0f
	chi	%r12,__LC_PGM_OLD_PSW
	je	0f
	la	%r1,__LC_SAVE_AREA+32
0:	mvc	SP_R12(32,%r15),0(%r1)	# move %r12-%r15 to stack
	mvc	SP_ARGS(8,%r15),__LC_LAST_BREAK
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	jg	kernel_stack_overflow
#endif

cleanup_table_system_call:
	.quad	system_call, sysc_do_svc
cleanup_table_sysc_return:
	.quad	sysc_return, sysc_leave
cleanup_table_sysc_leave:
	.quad	sysc_leave, sysc_done
cleanup_table_sysc_work_loop:
	.quad	sysc_work_loop, sysc_work_done
cleanup_table_io_return:
	.quad	io_return, io_leave
cleanup_table_io_leave:
	.quad	io_leave, io_done
cleanup_table_io_work_loop:
	.quad	io_work_loop, io_work_done

cleanup_critical:
	clc	8(8,%r12),BASED(cleanup_table_system_call)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_system_call+8)
	jl	cleanup_system_call
0:
	clc	8(8,%r12),BASED(cleanup_table_sysc_return)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_sysc_return+8)
	jl	cleanup_sysc_return
0:
	clc	8(8,%r12),BASED(cleanup_table_sysc_leave)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_sysc_leave+8)
	jl	cleanup_sysc_leave
0:
	clc	8(8,%r12),BASED(cleanup_table_sysc_work_loop)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)
	jl	cleanup_sysc_return
0:
	clc	8(8,%r12),BASED(cleanup_table_io_return)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_io_return+8)
	jl	cleanup_io_return
0:
	clc	8(8,%r12),BASED(cleanup_table_io_leave)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_io_leave+8)
	jl	cleanup_io_leave
0:
	clc	8(8,%r12),BASED(cleanup_table_io_work_loop)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_io_work_loop+8)
	jl	cleanup_io_return
0:
	br	%r14

cleanup_system_call:
	mvc	__LC_RETURN_PSW(16),0(%r12)
	cghi	%r12,__LC_MCK_OLD_PSW
	je	0f
	la	%r12,__LC_SAVE_AREA+32
	j	1f
0:	la	%r12,__LC_SAVE_AREA+64
1:
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8)
	jh	0f
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
0:	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16)
	jhe	cleanup_vtime
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn)
	jh	0f
	mvc	__LC_SAVE_AREA(32),0(%r12)
0:	stg	%r13,8(%r12)
	stg	%r12,__LC_SAVE_AREA+96	# argh
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	lg	%r12,__LC_SAVE_AREA+96	# argh
	stg	%r15,24(%r12)
	llgh	%r7,__LC_SVC_INT_CODE
cleanup_vtime:
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)
	jhe	cleanup_stime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
cleanup_stime:
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+32)
	jh	cleanup_update
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
cleanup_update:
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8)
	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_system_call_insn:
	.quad	sysc_saveall
	.quad	system_call
	.quad	sysc_vtime
	.quad	sysc_stime
	.quad	sysc_update

cleanup_sysc_return:
	mvc	__LC_RETURN_PSW(8),0(%r12)
	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return)
	la	%r12,__LC_RETURN_PSW
	br	%r14

cleanup_sysc_leave:
	clc	8(8,%r12),BASED(cleanup_sysc_leave_insn)
	je	3f
	clc	8(8,%r12),BASED(cleanup_sysc_leave_insn+8)
	jhe	0f
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
0:	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)
	cghi	%r12,__LC_MCK_OLD_PSW
	jne	1f
	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)
	j	2f
1:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)
2:	lmg	%r0,%r11,SP_R0(%r15)
	lg	%r15,SP_R15(%r15)
3:	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_sysc_leave_insn:
	.quad	sysc_done - 4
	.quad	sysc_done - 16

cleanup_io_return:
	mvc	__LC_RETURN_PSW(8),0(%r12)
	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_io_work_loop)
	la	%r12,__LC_RETURN_PSW
	br	%r14

cleanup_io_leave:
	clc	8(8,%r12),BASED(cleanup_io_leave_insn)
	je	3f
	clc	8(8,%r12),BASED(cleanup_io_leave_insn+8)
	jhe	0f
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
0:	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)
	cghi	%r12,__LC_MCK_OLD_PSW
	jne	1f
	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)
	j	2f
1:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)
2:	lmg	%r0,%r11,SP_R0(%r15)
	lg	%r15,SP_R15(%r15)
3:	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_io_leave_insn:
	.quad	io_done - 4
	.quad	io_done - 16

/*
 * Integer constants
 */
		.align	4
.Lconst:
.Lnr_syscalls:	.long	NR_syscalls
.L0x0130:	.short	0x130
.L0x0140:	.short	0x140
.L0x0150:	.short	0x150
.L0x0160:	.short	0x160
.L0x0170:	.short	0x170
.Lcritical_start:
		.quad	__critical_start
.Lcritical_end:
		.quad	__critical_end

		.section .rodata, "a"
#define SYSCALL(esa,esame,emu)	.long esame
	.globl	sys_call_table
sys_call_table:
#include "syscalls.S"
#undef SYSCALL

#ifdef CONFIG_COMPAT

#define SYSCALL(esa,esame,emu)	.long emu
sys_call_table_emu:
#include "syscalls.S"
#undef SYSCALL
#endif