summaryrefslogtreecommitdiffstats
path: root/arch/s390/kernel/entry64.S
blob: d0c9ffaa25db7b02c0bb77c76097e2cdceee852c (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
/*
 *  arch/s390/kernel/entry.S
 *    S390 low-level entry points.
 *
 *  S390 version
 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    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/config.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_TRAP      =  STACK_FRAME_OVERHEAD + __PT_TRAP
SP_SIZE      =  STACK_FRAME_OVERHEAD + __PT_SIZE

STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE  = 1 << STACK_SHIFT

_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING | \
		 _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)

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

	.macro  STORE_TIMER lc_offset
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	stpt	\lc_offset
#endif
	.endm

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.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
#endif

/*
 * 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 psworg,savearea,sync
	la	%r12,\psworg
	.if	\sync
	tm	\psworg+1,0x01		# test problem state bit
	jz	2f			# skip stack setup save
	lg	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
	.else
	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	0(%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
	.endif
#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
	la	%r12,\psworg
	stg	%r2,SP_ORIG_R2(%r15)	# store original content of gpr 2
	icm	%r12,12,__LC_SVC_ILC
	stmg	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
	st	%r12,SP_ILC(%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
	lmg	%r0,%r15,SP_R0(%r15)	# load gprs 0-15 of user
	STORE_TIMER __LC_EXIT_TIMER
	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:
	STORE_TIMER __LC_SYNC_ENTER_TIMER
sysc_saveall:
	SAVE_ALL_BASE __LC_SAVE_AREA
        SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
        CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	llgh    %r7,__LC_SVC_INT_CODE # get svc number from lowcore
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
sysc_vtime:
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	sysc_do_svc
	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
#endif
sysc_do_svc:
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
        slag    %r7,%r7,2         # *4 and 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
	slag    %r7,%r7,2         # svc 0: system call number in %r1
sysc_nr_ok:
	mvc	SP_ARGS(8,%r15),SP_R7(%r15)
sysc_do_restart:
	larl    %r10,sys_call_table
#ifdef CONFIG_S390_SUPPORT
	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+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
        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)
                                  # ATTENTION: check sys_execve_glue before
                                  # changing anything here !!

sysc_return:
        tm      SP_PSW+1(%r15),0x01    # returning to user ?
        jno     sysc_leave
	tm	__TI_flags+7(%r9),_TIF_WORK_SVC
	jnz	sysc_work         # there is work to do (signals etc.)
sysc_leave:
        RESTORE_ALL __LC_RETURN_PSW,1

#
# recheck if there is more work to do
#
sysc_work_loop:
	tm	__TI_flags+7(%r9),_TIF_WORK_SVC
	jz	sysc_leave        # there is no work to do
#
# One of the work bits is on. Find out which one.
#
sysc_work:
	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
	jo	sysc_sigpending
	tm	__TI_flags+7(%r9),_TIF_RESTART_SVC
	jo	sysc_restart
	tm	__TI_flags+7(%r9),_TIF_SINGLE_STEP
	jo	sysc_singlestep
	j	sysc_leave

#
# _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
        sgr     %r3,%r3           # clear *oldset
	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_leave        # out of here, do NOT recheck

#
# _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
        slag    %r7,%r7,2              # *4
	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
	lhi	%r0,__LC_PGM_OLD_PSW
	sth	%r0,SP_TRAP(%r15)	# set trap indication to pgm check
	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 syscall_trace before and after system call
# special linkage: %r12 contains the return address for trace_svc
#
sysc_tracesys:
	la	%r2,SP_PTREGS(%r15)    # load pt_regs
	la	%r3,0
	srl	%r7,2
	stg     %r7,SP_R2(%r15)
        brasl   %r14,syscall_trace
	lghi	%r0,NR_syscalls
	clg	%r0,SP_R2(%r15)
	jnh	sysc_tracenogo
	lg	%r7,SP_R2(%r15)   # strace might have changed the
	sll     %r7,2             #  system call
	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+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
        jz      sysc_return
	la	%r2,SP_PTREGS(%r15)    # load pt_regs
	la	%r3,1
	larl	%r14,sysc_return    # return point is sysc_return
	jg	syscall_trace

#
# 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
        stosm   24(%r15),0x03     # reenable interrupts
	j	sysc_return

#
# clone, fork, vfork, exec and sigreturn need glue,
# because they all expect pt_regs as parameter,
# but are called with different parameter.
# return-address is set up above
#
sys_clone_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        jg      sys_clone              # branch to sys_clone

#ifdef CONFIG_S390_SUPPORT
sys32_clone_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        jg      sys32_clone            # branch to sys32_clone
#endif

sys_fork_glue:  
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        jg      sys_fork               # branch to sys_fork

sys_vfork_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        jg      sys_vfork              # branch to sys_vfork

sys_execve_glue:        
        la      %r2,SP_PTREGS(%r15)   # load pt_regs
	lgr     %r12,%r14             # save return address
        brasl   %r14,sys_execve       # call sys_execve
        ltgr    %r2,%r2               # check if execve failed
        bnz     0(%r12)               # it did fail -> store result in gpr2
        b       6(%r12)               # SKIP STG 2,SP_R2(15) in
                                      # system_call/sysc_tracesys
#ifdef CONFIG_S390_SUPPORT
sys32_execve_glue:        
        la      %r2,SP_PTREGS(%r15)   # load pt_regs
	lgr     %r12,%r14             # save return address
        brasl   %r14,sys32_execve     # call sys32_execve
        ltgr    %r2,%r2               # check if execve failed
        bnz     0(%r12)               # it did fail -> store result in gpr2
        b       6(%r12)               # SKIP STG 2,SP_R2(15) in
                                      # system_call/sysc_tracesys
#endif

sys_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys_sigreturn         # branch to sys_sigreturn

#ifdef CONFIG_S390_SUPPORT
sys32_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys32_sigreturn       # branch to sys32_sigreturn
#endif

sys_rt_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys_rt_sigreturn      # branch to sys_sigreturn

#ifdef CONFIG_S390_SUPPORT
sys32_rt_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys32_rt_sigreturn    # branch to sys32_sigreturn
#endif

#
# sigsuspend and rt_sigsuspend need pt_regs as an additional
# parameter and they have to skip the store of %r2 into the
# user register %r2 because the return value was set in 
# sigsuspend and rt_sigsuspend already and must not be overwritten!
#

sys_sigsuspend_glue:    
        lgr     %r5,%r4               # move mask back
        lgr     %r4,%r3               # move history1 parameter
        lgr     %r3,%r2               # move history0 parameter
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as first parameter
	la      %r14,6(%r14)          # skip store of return value
        jg      sys_sigsuspend        # branch to sys_sigsuspend

#ifdef CONFIG_S390_SUPPORT
sys32_sigsuspend_glue:    
	llgfr	%r4,%r4               # unsigned long			
        lgr     %r5,%r4               # move mask back
	lgfr	%r3,%r3               # int			
        lgr     %r4,%r3               # move history1 parameter
	lgfr	%r2,%r2               # int			
        lgr     %r3,%r2               # move history0 parameter
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as first parameter
	la      %r14,6(%r14)          # skip store of return value
        jg      sys32_sigsuspend      # branch to sys32_sigsuspend
#endif

sys_rt_sigsuspend_glue: 
        lgr     %r4,%r3               # move sigsetsize parameter
        lgr     %r3,%r2               # move unewset parameter
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as first parameter
	la      %r14,6(%r14)          # skip store of return value
        jg      sys_rt_sigsuspend     # branch to sys_rt_sigsuspend

#ifdef CONFIG_S390_SUPPORT
sys32_rt_sigsuspend_glue: 
	llgfr	%r3,%r3               # size_t			
        lgr     %r4,%r3               # move sigsetsize parameter
	llgtr	%r2,%r2               # sigset_emu31_t *
        lgr     %r3,%r2               # move unewset parameter
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as first parameter
	la      %r14,6(%r14)          # skip store of return value
        jg      sys32_rt_sigsuspend   # branch to sys32_rt_sigsuspend
#endif

sys_sigaltstack_glue:
        la      %r4,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys_sigaltstack       # branch to sys_sigreturn

#ifdef CONFIG_S390_SUPPORT
sys32_sigaltstack_glue:
        la      %r4,SP_PTREGS(%r15)   # load pt_regs as parameter
        jg      sys32_sigaltstack_wrapper # branch to sys_sigreturn
#endif

/*
 * 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?).
 */
	STORE_TIMER __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 __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	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:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	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 __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	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:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	lg	%r1,__TI_task(%r9)
	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 __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	pgm_no_vtime3
	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_vtime3:
#endif
	llgh    %r7,__LC_SVC_INT_CODE	# get svc number from lowcore
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	lg	%r1,__TI_task(%r9)
	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
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	j	sysc_do_svc

/*
 * IO interrupt handler routine
 */
        .globl io_int_handler
io_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+32
        SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+32,0
	CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	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:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
        la      %r2,SP_PTREGS(%r15)    # address of register-save area
	brasl   %r14,do_IRQ            # call standard irq handler

io_return:
        tm      SP_PSW+1(%r15),0x01    # returning to user ?
#ifdef CONFIG_PREEMPT
	jno     io_preempt             # no -> check for preemptive scheduling
#else
        jno     io_leave               # no-> skip resched & signal
#endif
	tm	__TI_flags+7(%r9),_TIF_WORK_INT
	jnz	io_work                # there is work to do (signals etc.)
io_leave:
        RESTORE_ALL __LC_RETURN_PSW,0
io_done:

#ifdef CONFIG_PREEMPT
io_preempt:
	icm	%r0,15,__TI_precount(%r9)	
	jnz     io_leave
	# 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_leave
	larl    %r1,.Lc_pactive
	mvc     __TI_precount(4,%r9),0(%r1)
        stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
	brasl   %r14,schedule          # call schedule
        stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
	xc      __TI_precount(4,%r9),__TI_precount(%r9)
	j	io_resume_loop
#endif

#
# switch to kernel stack, then check TIF bits
#
io_work:
	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_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
	jo	io_sigpending
	j	io_leave

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

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

#
# _TIF_SIGPENDING is set, call do_signal
#
io_sigpending:     
	stosm   __SF_EMPTY(%r15),0x03	# reenable interrupts
	la      %r2,SP_PTREGS(%r15)	# load pt_regs
	slgr    %r3,%r3			# clear *oldset
	brasl	%r14,do_signal		# call do_signal
	stnsm   __SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
	j	sysc_leave		# out of here, do NOT recheck

/*
 * External interrupt handler routine
 */
        .globl  ext_int_handler
ext_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+32
        SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32,0
	CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	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:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	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:
	la	%r1,4095		# revalidate r1
	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r1)
  	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
	tm	__LC_MCCK_CODE+5,0x02   # stored cpu timer value valid?
	jo	0f
	spt	__LC_LAST_UPDATE_TIMER
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
	mvc	__LC_EXIT_TIMER(8),__LC_LAST_UPDATE_TIMER
#endif
0:	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
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	__LC_MCCK_CODE+2,0x08	# mwp of old psw valid?
	jno	mcck_no_vtime		# no -> no timer update
	tm      __LC_MCK_OLD_PSW+1,0x01 # 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:
#endif
	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
	brasl	%r14,s390_handle_mcck
mcck_return:
        RESTORE_ALL __LC_RETURN_MCCK_PSW,0

#ifdef CONFIG_SMP
/*
 * Restart interruption handler, kick starter for additional CPUs
 */
        .globl restart_int_handler
restart_int_handler:
        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
        stosm   __SF_EMPTY(%r15),0x04    # now we can turn dat on
	jg      start_secondary
#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	%r1,-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+16
0:	mvc	SP_R12(32,%r15),0(%r1)  # move %r12-%r15 to stack
        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_work_loop
cleanup_table_sysc_work_loop:
	.quad	sysc_work_loop, sysc_reschedule
cleanup_table_io_leave:
	.quad	io_leave, io_done
cleanup_table_io_work_loop:
	.quad	io_work_loop, io_mcck_pending

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_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:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	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
#endif
	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 __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
	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
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
cleanup_vtime:
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)
	jhe	cleanup_stime
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	cleanup_novtime
	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
cleanup_novtime:
#endif
	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
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.quad   system_call
	.quad   sysc_vtime
	.quad   sysc_stime
	.quad   sysc_update
#endif

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	2f
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	8(8,%r12),BASED(cleanup_sysc_leave_insn+8)
	je	2f
#endif
	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)
	cghi	%r12,__LC_MCK_OLD_PSW
	jne	0f
	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)
	j	1f
0:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)
1:	lmg	%r0,%r11,SP_R0(%r15)
	lg	%r15,SP_R15(%r15)
2:	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_sysc_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.quad	sysc_leave + 16
#endif
	.quad	sysc_leave + 12

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	2f
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	8(8,%r12),BASED(cleanup_io_leave_insn+8)
	je	2f
#endif
	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)
	cghi	%r12,__LC_MCK_OLD_PSW
	jne	0f
	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)
	j	1f
0:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)
1:	lmg	%r0,%r11,SP_R0(%r15)
	lg	%r15,SP_R15(%r15)
2:	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_io_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.quad	io_leave + 20
#endif
	.quad	io_leave + 16

/*
 * Integer constants
 */
               .align 4
.Lconst:
.Lc_pactive:   .long  PREEMPT_ACTIVE
.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

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

#ifdef CONFIG_S390_SUPPORT

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