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[S390] cleanup lowcore access from program checks
[net-next-2.6.git] / arch / s390 / kernel / entry.S
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1/*
2 * arch/s390/kernel/entry.S
3 * S390 low-level entry points.
4 *
5 * Copyright (C) IBM Corp. 1999,2006
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
7 * Hartmut Penner (hp@de.ibm.com),
8 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
9 * Heiko Carstens <heiko.carstens@de.ibm.com>
10 */
11
12#include <linux/sys.h>
13#include <linux/linkage.h>
14#include <linux/init.h>
15#include <asm/cache.h>
16#include <asm/errno.h>
17#include <asm/ptrace.h>
18#include <asm/thread_info.h>
19#include <asm/asm-offsets.h>
20#include <asm/unistd.h>
21#include <asm/page.h>
22
23/*
24 * Stack layout for the system_call stack entry.
25 * The first few entries are identical to the user_regs_struct.
26 */
27SP_PTREGS = STACK_FRAME_OVERHEAD
28SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS
29SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
30SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS
31SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4
32SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
33SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12
34SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
35SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20
36SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
37SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28
38SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
39SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36
40SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
41SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44
42SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
43SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52
44SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
45SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60
46SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
47SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC
48SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR
49SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
50
51_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
52 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
53_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
54 _TIF_MCCK_PENDING)
55_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
56 _TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8)
57
58STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
59STACK_SIZE = 1 << STACK_SHIFT
60
61#define BASED(name) name-system_call(%r13)
62
63#ifdef CONFIG_TRACE_IRQFLAGS
64 .macro TRACE_IRQS_ON
65 basr %r2,%r0
66 l %r1,BASED(.Ltrace_irq_on_caller)
67 basr %r14,%r1
68 .endm
69
70 .macro TRACE_IRQS_OFF
71 basr %r2,%r0
72 l %r1,BASED(.Ltrace_irq_off_caller)
73 basr %r14,%r1
74 .endm
75#else
76#define TRACE_IRQS_ON
77#define TRACE_IRQS_OFF
78#endif
79
80#ifdef CONFIG_LOCKDEP
81 .macro LOCKDEP_SYS_EXIT
82 tm SP_PSW+1(%r15),0x01 # returning to user ?
83 jz 0f
84 l %r1,BASED(.Llockdep_sys_exit)
85 basr %r14,%r1
860:
87 .endm
88#else
89#define LOCKDEP_SYS_EXIT
90#endif
91
92/*
93 * Register usage in interrupt handlers:
94 * R9 - pointer to current task structure
95 * R13 - pointer to literal pool
96 * R14 - return register for function calls
97 * R15 - kernel stack pointer
98 */
99
100 .macro UPDATE_VTIME lc_from,lc_to,lc_sum
101 lm %r10,%r11,\lc_from
102 sl %r10,\lc_to
103 sl %r11,\lc_to+4
104 bc 3,BASED(0f)
105 sl %r10,BASED(.Lc_1)
1060: al %r10,\lc_sum
107 al %r11,\lc_sum+4
108 bc 12,BASED(1f)
109 al %r10,BASED(.Lc_1)
1101: stm %r10,%r11,\lc_sum
111 .endm
112
113 .macro SAVE_ALL_BASE savearea
114 stm %r12,%r15,\savearea
115 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
116 .endm
117
118 .macro SAVE_ALL_SVC psworg,savearea
119 la %r12,\psworg
120 l %r15,__LC_KERNEL_STACK # problem state -> load ksp
121 .endm
122
123 .macro SAVE_ALL_SYNC psworg,savearea
124 la %r12,\psworg
125 tm \psworg+1,0x01 # test problem state bit
126 bz BASED(2f) # skip stack setup save
127 l %r15,__LC_KERNEL_STACK # problem state -> load ksp
128#ifdef CONFIG_CHECK_STACK
129 b BASED(3f)
1302: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
131 bz BASED(stack_overflow)
1323:
133#endif
1342:
135 .endm
136
137 .macro SAVE_ALL_ASYNC psworg,savearea
138 la %r12,\psworg
139 tm \psworg+1,0x01 # test problem state bit
140 bnz BASED(1f) # from user -> load async stack
141 clc \psworg+4(4),BASED(.Lcritical_end)
142 bhe BASED(0f)
143 clc \psworg+4(4),BASED(.Lcritical_start)
144 bl BASED(0f)
145 l %r14,BASED(.Lcleanup_critical)
146 basr %r14,%r14
147 tm 1(%r12),0x01 # retest problem state after cleanup
148 bnz BASED(1f)
1490: l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
150 slr %r14,%r15
151 sra %r14,STACK_SHIFT
152 be BASED(2f)
1531: l %r15,__LC_ASYNC_STACK
154#ifdef CONFIG_CHECK_STACK
155 b BASED(3f)
1562: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
157 bz BASED(stack_overflow)
1583:
159#endif
1602:
161 .endm
162
163 .macro CREATE_STACK_FRAME psworg,savearea
164 s %r15,BASED(.Lc_spsize) # make room for registers & psw
165 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
166 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
167 icm %r12,12,__LC_SVC_ILC
168 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
169 st %r12,SP_ILC(%r15)
170 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack
171 la %r12,0
172 st %r12,__SF_BACKCHAIN(%r15) # clear back chain
173 .endm
174
175 .macro RESTORE_ALL psworg,sync
176 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore
177 .if !\sync
178 ni \psworg+1,0xfd # clear wait state bit
179 .endif
180 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
181 stpt __LC_EXIT_TIMER
182 lpsw \psworg # back to caller
183 .endm
184
185 .macro REENABLE_IRQS
186 mvc __SF_EMPTY(1,%r15),SP_PSW(%r15)
187 ni __SF_EMPTY(%r15),0xbf
188 ssm __SF_EMPTY(%r15)
189 .endm
190
191/*
192 * Scheduler resume function, called by switch_to
193 * gpr2 = (task_struct *) prev
194 * gpr3 = (task_struct *) next
195 * Returns:
196 * gpr2 = prev
197 */
198 .globl __switch_to
199__switch_to:
200 basr %r1,0
201__switch_to_base:
202 tm __THREAD_per(%r3),0xe8 # new process is using per ?
203 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine
204 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff
205 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15)
206 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's
207 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't
208__switch_to_noper:
209 l %r4,__THREAD_info(%r2) # get thread_info of prev
210 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
211 bz __switch_to_no_mcck-__switch_to_base(%r1)
212 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
213 l %r4,__THREAD_info(%r3) # get thread_info of next
214 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
215__switch_to_no_mcck:
216 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
217 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
218 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
219 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
220 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct
221 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
222 l %r3,__THREAD_info(%r3) # load thread_info from task struct
223 st %r3,__LC_THREAD_INFO
224 ahi %r3,STACK_SIZE
225 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
226 br %r14
227
228__critical_start:
229/*
230 * SVC interrupt handler routine. System calls are synchronous events and
231 * are executed with interrupts enabled.
232 */
233
234 .globl system_call
235system_call:
236 stpt __LC_SYNC_ENTER_TIMER
237sysc_saveall:
238 SAVE_ALL_BASE __LC_SAVE_AREA
239 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
240 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
241 lh %r7,0x8a # get svc number from lowcore
242sysc_vtime:
243 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
244sysc_stime:
245 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
246sysc_update:
247 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
248sysc_do_svc:
249 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
250 ltr %r7,%r7 # test for svc 0
251 bnz BASED(sysc_nr_ok) # svc number > 0
252 # svc 0: system call number in %r1
253 cl %r1,BASED(.Lnr_syscalls)
254 bnl BASED(sysc_nr_ok)
255 lr %r7,%r1 # copy svc number to %r7
256sysc_nr_ok:
257 mvc SP_ARGS(4,%r15),SP_R7(%r15)
258sysc_do_restart:
259 sth %r7,SP_SVCNR(%r15)
260 sll %r7,2 # svc number *4
261 l %r8,BASED(.Lsysc_table)
262 tm __TI_flags+2(%r9),_TIF_SYSCALL
263 l %r8,0(%r7,%r8) # get system call addr.
264 bnz BASED(sysc_tracesys)
265 basr %r14,%r8 # call sys_xxxx
266 st %r2,SP_R2(%r15) # store return value (change R2 on stack)
267
268sysc_return:
269 LOCKDEP_SYS_EXIT
270sysc_tif:
271 tm __TI_flags+3(%r9),_TIF_WORK_SVC
272 bnz BASED(sysc_work) # there is work to do (signals etc.)
273sysc_restore:
274 RESTORE_ALL __LC_RETURN_PSW,1
275sysc_done:
276
277#
278# There is work to do, but first we need to check if we return to userspace.
279#
280sysc_work:
281 tm SP_PSW+1(%r15),0x01 # returning to user ?
282 bno BASED(sysc_restore)
283
284#
285# One of the work bits is on. Find out which one.
286#
287sysc_work_tif:
288 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
289 bo BASED(sysc_mcck_pending)
290 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
291 bo BASED(sysc_reschedule)
292 tm __TI_flags+3(%r9),_TIF_SIGPENDING
293 bo BASED(sysc_sigpending)
294 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
295 bo BASED(sysc_notify_resume)
296 tm __TI_flags+3(%r9),_TIF_RESTART_SVC
297 bo BASED(sysc_restart)
298 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
299 bo BASED(sysc_singlestep)
300 b BASED(sysc_return) # beware of critical section cleanup
301
302#
303# _TIF_NEED_RESCHED is set, call schedule
304#
305sysc_reschedule:
306 l %r1,BASED(.Lschedule)
307 la %r14,BASED(sysc_return)
308 br %r1 # call scheduler
309
310#
311# _TIF_MCCK_PENDING is set, call handler
312#
313sysc_mcck_pending:
314 l %r1,BASED(.Ls390_handle_mcck)
315 la %r14,BASED(sysc_return)
316 br %r1 # TIF bit will be cleared by handler
317
318#
319# _TIF_SIGPENDING is set, call do_signal
320#
321sysc_sigpending:
322 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
323 la %r2,SP_PTREGS(%r15) # load pt_regs
324 l %r1,BASED(.Ldo_signal)
325 basr %r14,%r1 # call do_signal
326 tm __TI_flags+3(%r9),_TIF_RESTART_SVC
327 bo BASED(sysc_restart)
328 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
329 bo BASED(sysc_singlestep)
330 b BASED(sysc_return)
331
332#
333# _TIF_NOTIFY_RESUME is set, call do_notify_resume
334#
335sysc_notify_resume:
336 la %r2,SP_PTREGS(%r15) # load pt_regs
337 l %r1,BASED(.Ldo_notify_resume)
338 la %r14,BASED(sysc_return)
339 br %r1 # call do_notify_resume
340
341
342#
343# _TIF_RESTART_SVC is set, set up registers and restart svc
344#
345sysc_restart:
346 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
347 l %r7,SP_R2(%r15) # load new svc number
348 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
349 lm %r2,%r6,SP_R2(%r15) # load svc arguments
350 b BASED(sysc_do_restart) # restart svc
351
352#
353# _TIF_SINGLE_STEP is set, call do_single_step
354#
355sysc_singlestep:
356 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
357 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check
358 mvi SP_SVCNR+1(%r15),0xff
359 la %r2,SP_PTREGS(%r15) # address of register-save area
360 l %r1,BASED(.Lhandle_per) # load adr. of per handler
361 la %r14,BASED(sysc_return) # load adr. of system return
362 br %r1 # branch to do_single_step
363
364#
365# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
366# and after the system call
367#
368sysc_tracesys:
369 l %r1,BASED(.Ltrace_entry)
370 la %r2,SP_PTREGS(%r15) # load pt_regs
371 la %r3,0
372 srl %r7,2
373 st %r7,SP_R2(%r15)
374 basr %r14,%r1
375 cl %r2,BASED(.Lnr_syscalls)
376 bnl BASED(sysc_tracenogo)
377 l %r8,BASED(.Lsysc_table)
378 lr %r7,%r2
379 sll %r7,2 # svc number *4
380 l %r8,0(%r7,%r8)
381sysc_tracego:
382 lm %r3,%r6,SP_R3(%r15)
383 l %r2,SP_ORIG_R2(%r15)
384 basr %r14,%r8 # call sys_xxx
385 st %r2,SP_R2(%r15) # store return value
386sysc_tracenogo:
387 tm __TI_flags+2(%r9),_TIF_SYSCALL
388 bz BASED(sysc_return)
389 l %r1,BASED(.Ltrace_exit)
390 la %r2,SP_PTREGS(%r15) # load pt_regs
391 la %r14,BASED(sysc_return)
392 br %r1
393
394#
395# a new process exits the kernel with ret_from_fork
396#
397 .globl ret_from_fork
398ret_from_fork:
399 l %r13,__LC_SVC_NEW_PSW+4
400 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
401 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ?
402 bo BASED(0f)
403 st %r15,SP_R15(%r15) # store stack pointer for new kthread
4040: l %r1,BASED(.Lschedtail)
405 basr %r14,%r1
406 TRACE_IRQS_ON
407 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
408 b BASED(sysc_tracenogo)
409
410#
411# kernel_execve function needs to deal with pt_regs that is not
412# at the usual place
413#
414 .globl kernel_execve
415kernel_execve:
416 stm %r12,%r15,48(%r15)
417 lr %r14,%r15
418 l %r13,__LC_SVC_NEW_PSW+4
419 s %r15,BASED(.Lc_spsize)
420 st %r14,__SF_BACKCHAIN(%r15)
421 la %r12,SP_PTREGS(%r15)
422 xc 0(__PT_SIZE,%r12),0(%r12)
423 l %r1,BASED(.Ldo_execve)
424 lr %r5,%r12
425 basr %r14,%r1
426 ltr %r2,%r2
427 be BASED(0f)
428 a %r15,BASED(.Lc_spsize)
429 lm %r12,%r15,48(%r15)
430 br %r14
431 # execve succeeded.
4320: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts
433 l %r15,__LC_KERNEL_STACK # load ksp
434 s %r15,BASED(.Lc_spsize) # make room for registers & psw
435 l %r9,__LC_THREAD_INFO
436 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs
437 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
438 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
439 l %r1,BASED(.Lexecve_tail)
440 basr %r14,%r1
441 b BASED(sysc_return)
442
443/*
444 * Program check handler routine
445 */
446
447 .globl pgm_check_handler
448pgm_check_handler:
449/*
450 * First we need to check for a special case:
451 * Single stepping an instruction that disables the PER event mask will
452 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
453 * For a single stepped SVC the program check handler gets control after
454 * the SVC new PSW has been loaded. But we want to execute the SVC first and
455 * then handle the PER event. Therefore we update the SVC old PSW to point
456 * to the pgm_check_handler and branch to the SVC handler after we checked
457 * if we have to load the kernel stack register.
458 * For every other possible cause for PER event without the PER mask set
459 * we just ignore the PER event (FIXME: is there anything we have to do
460 * for LPSW?).
461 */
462 stpt __LC_SYNC_ENTER_TIMER
463 SAVE_ALL_BASE __LC_SAVE_AREA
464 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
465 bnz BASED(pgm_per) # got per exception -> special case
466 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
467 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
468 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
469 bz BASED(pgm_no_vtime)
470 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
471 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
472 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
473pgm_no_vtime:
474 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
475 l %r3,__LC_PGM_ILC # load program interruption code
476 l %r4,__LC_TRANS_EXC_CODE
477 REENABLE_IRQS
478 la %r8,0x7f
479 nr %r8,%r3
480pgm_do_call:
481 l %r7,BASED(.Ljump_table)
482 sll %r8,2
483 l %r7,0(%r8,%r7) # load address of handler routine
484 la %r2,SP_PTREGS(%r15) # address of register-save area
485 basr %r14,%r7 # branch to interrupt-handler
486pgm_exit:
487 b BASED(sysc_return)
488
489#
490# handle per exception
491#
492pgm_per:
493 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on
494 bnz BASED(pgm_per_std) # ok, normal per event from user space
495# ok its one of the special cases, now we need to find out which one
496 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW
497 be BASED(pgm_svcper)
498# no interesting special case, ignore PER event
499 lm %r12,%r15,__LC_SAVE_AREA
500 lpsw 0x28
501
502#
503# Normal per exception
504#
505pgm_per_std:
506 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
507 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
508 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
509 bz BASED(pgm_no_vtime2)
510 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
511 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
512 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
513pgm_no_vtime2:
514 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
515 l %r1,__TI_task(%r9)
516 tm SP_PSW+1(%r15),0x01 # kernel per event ?
517 bz BASED(kernel_per)
518 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
519 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
520 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
521 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
522 l %r3,__LC_PGM_ILC # load program interruption code
523 l %r4,__LC_TRANS_EXC_CODE
524 REENABLE_IRQS
525 la %r8,0x7f
526 nr %r8,%r3 # clear per-event-bit and ilc
527 be BASED(pgm_exit2) # only per or per+check ?
528 l %r7,BASED(.Ljump_table)
529 sll %r8,2
530 l %r7,0(%r8,%r7) # load address of handler routine
531 la %r2,SP_PTREGS(%r15) # address of register-save area
532 basr %r14,%r7 # branch to interrupt-handler
533pgm_exit2:
534 b BASED(sysc_return)
535
536#
537# it was a single stepped SVC that is causing all the trouble
538#
539pgm_svcper:
540 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
541 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
542 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
543 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
544 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
545 lh %r7,0x8a # get svc number from lowcore
546 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
547 l %r8,__TI_task(%r9)
548 mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
549 mvc __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS
550 mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
551 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
552 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
553 lm %r2,%r6,SP_R2(%r15) # load svc arguments
554 b BASED(sysc_do_svc)
555
556#
557# per was called from kernel, must be kprobes
558#
559kernel_per:
560 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check
561 mvi SP_SVCNR+1(%r15),0xff
562 la %r2,SP_PTREGS(%r15) # address of register-save area
563 l %r1,BASED(.Lhandle_per) # load adr. of per handler
564 basr %r14,%r1 # branch to do_single_step
565 b BASED(pgm_exit)
566
567/*
568 * IO interrupt handler routine
569 */
570
571 .globl io_int_handler
572io_int_handler:
573 stck __LC_INT_CLOCK
574 stpt __LC_ASYNC_ENTER_TIMER
575 SAVE_ALL_BASE __LC_SAVE_AREA+16
576 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
577 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
578 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
579 bz BASED(io_no_vtime)
580 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
581 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
582 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
583io_no_vtime:
584 TRACE_IRQS_OFF
585 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
586 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ
587 la %r2,SP_PTREGS(%r15) # address of register-save area
588 basr %r14,%r1 # branch to standard irq handler
589io_return:
590 LOCKDEP_SYS_EXIT
591 TRACE_IRQS_ON
592io_tif:
593 tm __TI_flags+3(%r9),_TIF_WORK_INT
594 bnz BASED(io_work) # there is work to do (signals etc.)
595io_restore:
596 RESTORE_ALL __LC_RETURN_PSW,0
597io_done:
598
599#
600# There is work todo, find out in which context we have been interrupted:
601# 1) if we return to user space we can do all _TIF_WORK_INT work
602# 2) if we return to kernel code and preemptive scheduling is enabled check
603# the preemption counter and if it is zero call preempt_schedule_irq
604# Before any work can be done, a switch to the kernel stack is required.
605#
606io_work:
607 tm SP_PSW+1(%r15),0x01 # returning to user ?
608 bo BASED(io_work_user) # yes -> do resched & signal
609#ifdef CONFIG_PREEMPT
610 # check for preemptive scheduling
611 icm %r0,15,__TI_precount(%r9)
612 bnz BASED(io_restore) # preemption disabled
613 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
614 bno BASED(io_restore)
615 # switch to kernel stack
616 l %r1,SP_R15(%r15)
617 s %r1,BASED(.Lc_spsize)
618 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
619 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
620 lr %r15,%r1
621 # TRACE_IRQS_ON already done at io_return, call
622 # TRACE_IRQS_OFF to keep things symmetrical
623 TRACE_IRQS_OFF
624 l %r1,BASED(.Lpreempt_schedule_irq)
625 basr %r14,%r1 # call preempt_schedule_irq
626 b BASED(io_return)
627#else
628 b BASED(io_restore)
629#endif
630
631#
632# Need to do work before returning to userspace, switch to kernel stack
633#
634io_work_user:
635 l %r1,__LC_KERNEL_STACK
636 s %r1,BASED(.Lc_spsize)
637 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
638 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
639 lr %r15,%r1
640
641#
642# One of the work bits is on. Find out which one.
643# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED
644# and _TIF_MCCK_PENDING
645#
646io_work_tif:
647 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
648 bo BASED(io_mcck_pending)
649 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
650 bo BASED(io_reschedule)
651 tm __TI_flags+3(%r9),_TIF_SIGPENDING
652 bo BASED(io_sigpending)
653 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
654 bo BASED(io_notify_resume)
655 b BASED(io_return) # beware of critical section cleanup
656
657#
658# _TIF_MCCK_PENDING is set, call handler
659#
660io_mcck_pending:
661 # TRACE_IRQS_ON already done at io_return
662 l %r1,BASED(.Ls390_handle_mcck)
663 basr %r14,%r1 # TIF bit will be cleared by handler
664 TRACE_IRQS_OFF
665 b BASED(io_return)
666
667#
668# _TIF_NEED_RESCHED is set, call schedule
669#
670io_reschedule:
671 # TRACE_IRQS_ON already done at io_return
672 l %r1,BASED(.Lschedule)
673 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
674 basr %r14,%r1 # call scheduler
675 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
676 TRACE_IRQS_OFF
677 b BASED(io_return)
678
679#
680# _TIF_SIGPENDING is set, call do_signal
681#
682io_sigpending:
683 # TRACE_IRQS_ON already done at io_return
684 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
685 la %r2,SP_PTREGS(%r15) # load pt_regs
686 l %r1,BASED(.Ldo_signal)
687 basr %r14,%r1 # call do_signal
688 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
689 TRACE_IRQS_OFF
690 b BASED(io_return)
691
692#
693# _TIF_SIGPENDING is set, call do_signal
694#
695io_notify_resume:
696 # TRACE_IRQS_ON already done at io_return
697 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
698 la %r2,SP_PTREGS(%r15) # load pt_regs
699 l %r1,BASED(.Ldo_notify_resume)
700 basr %r14,%r1 # call do_signal
701 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
702 TRACE_IRQS_OFF
703 b BASED(io_return)
704
705/*
706 * External interrupt handler routine
707 */
708
709 .globl ext_int_handler
710ext_int_handler:
711 stck __LC_INT_CLOCK
712 stpt __LC_ASYNC_ENTER_TIMER
713 SAVE_ALL_BASE __LC_SAVE_AREA+16
714 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
715 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
716 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
717 bz BASED(ext_no_vtime)
718 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
719 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
720 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
721ext_no_vtime:
722 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
723 TRACE_IRQS_OFF
724 la %r2,SP_PTREGS(%r15) # address of register-save area
725 lh %r3,__LC_EXT_INT_CODE # get interruption code
726 l %r1,BASED(.Ldo_extint)
727 basr %r14,%r1
728 b BASED(io_return)
729
730__critical_end:
731
732/*
733 * Machine check handler routines
734 */
735
736 .globl mcck_int_handler
737mcck_int_handler:
738 stck __LC_MCCK_CLOCK
739 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer
740 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs
741 SAVE_ALL_BASE __LC_SAVE_AREA+32
742 la %r12,__LC_MCK_OLD_PSW
743 tm __LC_MCCK_CODE,0x80 # system damage?
744 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid
745 mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
746 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
747 bo BASED(1f)
748 la %r14,__LC_SYNC_ENTER_TIMER
749 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
750 bl BASED(0f)
751 la %r14,__LC_ASYNC_ENTER_TIMER
7520: clc 0(8,%r14),__LC_EXIT_TIMER
753 bl BASED(0f)
754 la %r14,__LC_EXIT_TIMER
7550: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
756 bl BASED(0f)
757 la %r14,__LC_LAST_UPDATE_TIMER
7580: spt 0(%r14)
759 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
7601: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
761 bno BASED(mcck_int_main) # no -> skip cleanup critical
762 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
763 bnz BASED(mcck_int_main) # from user -> load async stack
764 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end)
765 bhe BASED(mcck_int_main)
766 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start)
767 bl BASED(mcck_int_main)
768 l %r14,BASED(.Lcleanup_critical)
769 basr %r14,%r14
770mcck_int_main:
771 l %r14,__LC_PANIC_STACK # are we already on the panic stack?
772 slr %r14,%r15
773 sra %r14,PAGE_SHIFT
774 be BASED(0f)
775 l %r15,__LC_PANIC_STACK # load panic stack
7760: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
777 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
778 bno BASED(mcck_no_vtime) # no -> skip cleanup critical
779 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
780 bz BASED(mcck_no_vtime)
781 UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER
782 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
783 mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER
784mcck_no_vtime:
785 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
786 la %r2,SP_PTREGS(%r15) # load pt_regs
787 l %r1,BASED(.Ls390_mcck)
788 basr %r14,%r1 # call machine check handler
789 tm SP_PSW+1(%r15),0x01 # returning to user ?
790 bno BASED(mcck_return)
791 l %r1,__LC_KERNEL_STACK # switch to kernel stack
792 s %r1,BASED(.Lc_spsize)
793 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
794 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
795 lr %r15,%r1
796 stosm __SF_EMPTY(%r15),0x04 # turn dat on
797 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
798 bno BASED(mcck_return)
799 TRACE_IRQS_OFF
800 l %r1,BASED(.Ls390_handle_mcck)
801 basr %r14,%r1 # call machine check handler
802 TRACE_IRQS_ON
803mcck_return:
804 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW
805 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
806 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
807 bno BASED(0f)
808 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
809 stpt __LC_EXIT_TIMER
810 lpsw __LC_RETURN_MCCK_PSW # back to caller
8110: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
812 lpsw __LC_RETURN_MCCK_PSW # back to caller
813
814 RESTORE_ALL __LC_RETURN_MCCK_PSW,0
815
816/*
817 * Restart interruption handler, kick starter for additional CPUs
818 */
819#ifdef CONFIG_SMP
820 __CPUINIT
821 .globl restart_int_handler
822restart_int_handler:
823 basr %r1,0
824restart_base:
825 spt restart_vtime-restart_base(%r1)
826 stck __LC_LAST_UPDATE_CLOCK
827 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
828 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
829 l %r15,__LC_SAVE_AREA+60 # load ksp
830 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
831 lam %a0,%a15,__LC_AREGS_SAVE_AREA
832 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone
833 l %r1,__LC_THREAD_INFO
834 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1)
835 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
836 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER
837 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on
838 basr %r14,0
839 l %r14,restart_addr-.(%r14)
840 br %r14 # branch to start_secondary
841restart_addr:
842 .long start_secondary
843 .align 8
844restart_vtime:
845 .long 0x7fffffff,0xffffffff
846 .previous
847#else
848/*
849 * If we do not run with SMP enabled, let the new CPU crash ...
850 */
851 .globl restart_int_handler
852restart_int_handler:
853 basr %r1,0
854restart_base:
855 lpsw restart_crash-restart_base(%r1)
856 .align 8
857restart_crash:
858 .long 0x000a0000,0x00000000
859restart_go:
860#endif
861
862#ifdef CONFIG_CHECK_STACK
863/*
864 * The synchronous or the asynchronous stack overflowed. We are dead.
865 * No need to properly save the registers, we are going to panic anyway.
866 * Setup a pt_regs so that show_trace can provide a good call trace.
867 */
868stack_overflow:
869 l %r15,__LC_PANIC_STACK # change to panic stack
870 sl %r15,BASED(.Lc_spsize)
871 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
872 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
873 la %r1,__LC_SAVE_AREA
874 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ?
875 be BASED(0f)
876 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ?
877 be BASED(0f)
878 la %r1,__LC_SAVE_AREA+16
8790: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack
880 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
881 l %r1,BASED(1f) # branch to kernel_stack_overflow
882 la %r2,SP_PTREGS(%r15) # load pt_regs
883 br %r1
8841: .long kernel_stack_overflow
885#endif
886
887cleanup_table_system_call:
888 .long system_call + 0x80000000, sysc_do_svc + 0x80000000
889cleanup_table_sysc_tif:
890 .long sysc_tif + 0x80000000, sysc_restore + 0x80000000
891cleanup_table_sysc_restore:
892 .long sysc_restore + 0x80000000, sysc_done + 0x80000000
893cleanup_table_io_tif:
894 .long io_tif + 0x80000000, io_restore + 0x80000000
895cleanup_table_io_restore:
896 .long io_restore + 0x80000000, io_done + 0x80000000
897
898cleanup_critical:
899 clc 4(4,%r12),BASED(cleanup_table_system_call)
900 bl BASED(0f)
901 clc 4(4,%r12),BASED(cleanup_table_system_call+4)
902 bl BASED(cleanup_system_call)
9030:
904 clc 4(4,%r12),BASED(cleanup_table_sysc_tif)
905 bl BASED(0f)
906 clc 4(4,%r12),BASED(cleanup_table_sysc_tif+4)
907 bl BASED(cleanup_sysc_tif)
9080:
909 clc 4(4,%r12),BASED(cleanup_table_sysc_restore)
910 bl BASED(0f)
911 clc 4(4,%r12),BASED(cleanup_table_sysc_restore+4)
912 bl BASED(cleanup_sysc_restore)
9130:
914 clc 4(4,%r12),BASED(cleanup_table_io_tif)
915 bl BASED(0f)
916 clc 4(4,%r12),BASED(cleanup_table_io_tif+4)
917 bl BASED(cleanup_io_tif)
9180:
919 clc 4(4,%r12),BASED(cleanup_table_io_restore)
920 bl BASED(0f)
921 clc 4(4,%r12),BASED(cleanup_table_io_restore+4)
922 bl BASED(cleanup_io_restore)
9230:
924 br %r14
925
926cleanup_system_call:
927 mvc __LC_RETURN_PSW(8),0(%r12)
928 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
929 bh BASED(0f)
930 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
931 c %r12,BASED(.Lmck_old_psw)
932 be BASED(0f)
933 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
9340: c %r12,BASED(.Lmck_old_psw)
935 la %r12,__LC_SAVE_AREA+32
936 be BASED(0f)
937 la %r12,__LC_SAVE_AREA+16
9380: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8)
939 bhe BASED(cleanup_vtime)
940 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
941 bh BASED(0f)
942 mvc __LC_SAVE_AREA(16),0(%r12)
9430: st %r13,4(%r12)
944 st %r12,__LC_SAVE_AREA+48 # argh
945 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
946 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
947 l %r12,__LC_SAVE_AREA+48 # argh
948 st %r15,12(%r12)
949 lh %r7,0x8a
950cleanup_vtime:
951 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
952 bhe BASED(cleanup_stime)
953 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
954cleanup_stime:
955 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16)
956 bh BASED(cleanup_update)
957 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
958cleanup_update:
959 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
960 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4)
961 la %r12,__LC_RETURN_PSW
962 br %r14
963cleanup_system_call_insn:
964 .long sysc_saveall + 0x80000000
965 .long system_call + 0x80000000
966 .long sysc_vtime + 0x80000000
967 .long sysc_stime + 0x80000000
968 .long sysc_update + 0x80000000
969
970cleanup_sysc_tif:
971 mvc __LC_RETURN_PSW(4),0(%r12)
972 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif)
973 la %r12,__LC_RETURN_PSW
974 br %r14
975
976cleanup_sysc_restore:
977 clc 4(4,%r12),BASED(cleanup_sysc_restore_insn)
978 be BASED(2f)
979 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
980 c %r12,BASED(.Lmck_old_psw)
981 be BASED(0f)
982 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
9830: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4)
984 be BASED(2f)
985 mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
986 c %r12,BASED(.Lmck_old_psw)
987 la %r12,__LC_SAVE_AREA+32
988 be BASED(1f)
989 la %r12,__LC_SAVE_AREA+16
9901: mvc 0(16,%r12),SP_R12(%r15)
991 lm %r0,%r11,SP_R0(%r15)
992 l %r15,SP_R15(%r15)
9932: la %r12,__LC_RETURN_PSW
994 br %r14
995cleanup_sysc_restore_insn:
996 .long sysc_done - 4 + 0x80000000
997 .long sysc_done - 8 + 0x80000000
998
999cleanup_io_tif:
1000 mvc __LC_RETURN_PSW(4),0(%r12)
1001 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif)
1002 la %r12,__LC_RETURN_PSW
1003 br %r14
1004
1005cleanup_io_restore:
1006 clc 4(4,%r12),BASED(cleanup_io_restore_insn)
1007 be BASED(1f)
1008 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
1009 clc 4(4,%r12),BASED(cleanup_io_restore_insn+4)
1010 be BASED(1f)
1011 mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
1012 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15)
1013 lm %r0,%r11,SP_R0(%r15)
1014 l %r15,SP_R15(%r15)
10151: la %r12,__LC_RETURN_PSW
1016 br %r14
1017cleanup_io_restore_insn:
1018 .long io_done - 4 + 0x80000000
1019 .long io_done - 8 + 0x80000000
1020
1021/*
1022 * Integer constants
1023 */
1024 .align 4
1025.Lc_spsize: .long SP_SIZE
1026.Lc_overhead: .long STACK_FRAME_OVERHEAD
1027.Lnr_syscalls: .long NR_syscalls
1028.L0x018: .short 0x018
1029.L0x020: .short 0x020
1030.L0x028: .short 0x028
1031.L0x030: .short 0x030
1032.L0x038: .short 0x038
1033.Lc_1: .long 1
1034
1035/*
1036 * Symbol constants
1037 */
1038.Ls390_mcck: .long s390_do_machine_check
1039.Ls390_handle_mcck:
1040 .long s390_handle_mcck
1041.Lmck_old_psw: .long __LC_MCK_OLD_PSW
1042.Ldo_IRQ: .long do_IRQ
1043.Ldo_extint: .long do_extint
1044.Ldo_signal: .long do_signal
1045.Ldo_notify_resume:
1046 .long do_notify_resume
1047.Lhandle_per: .long do_single_step
1048.Ldo_execve: .long do_execve
1049.Lexecve_tail: .long execve_tail
1050.Ljump_table: .long pgm_check_table
1051.Lschedule: .long schedule
1052#ifdef CONFIG_PREEMPT
1053.Lpreempt_schedule_irq:
1054 .long preempt_schedule_irq
1055#endif
1056.Ltrace_entry: .long do_syscall_trace_enter
1057.Ltrace_exit: .long do_syscall_trace_exit
1058.Lschedtail: .long schedule_tail
1059.Lsysc_table: .long sys_call_table
1060#ifdef CONFIG_TRACE_IRQFLAGS
1061.Ltrace_irq_on_caller:
1062 .long trace_hardirqs_on_caller
1063.Ltrace_irq_off_caller:
1064 .long trace_hardirqs_off_caller
1065#endif
1066#ifdef CONFIG_LOCKDEP
1067.Llockdep_sys_exit:
1068 .long lockdep_sys_exit
1069#endif
1070.Lcritical_start:
1071 .long __critical_start + 0x80000000
1072.Lcritical_end:
1073 .long __critical_end + 0x80000000
1074.Lcleanup_critical:
1075 .long cleanup_critical
1076
1077 .section .rodata, "a"
1078#define SYSCALL(esa,esame,emu) .long esa
1079 .globl sys_call_table
1080sys_call_table:
1081#include "syscalls.S"
1082#undef SYSCALL
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