2 * arch/s390/kernel/entry.S
3 * S390 low-level entry points.
5 * Copyright (C) IBM Corp. 1999,2012
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>
12 #include <linux/init.h>
13 #include <linux/linkage.h>
14 #include <asm/cache.h>
15 #include <asm/errno.h>
16 #include <asm/ptrace.h>
17 #include <asm/thread_info.h>
18 #include <asm/asm-offsets.h>
19 #include <asm/unistd.h>
23 __PT_R1 = __PT_GPRS + 4
24 __PT_R2 = __PT_GPRS + 8
25 __PT_R3 = __PT_GPRS + 12
26 __PT_R4 = __PT_GPRS + 16
27 __PT_R5 = __PT_GPRS + 20
28 __PT_R6 = __PT_GPRS + 24
29 __PT_R7 = __PT_GPRS + 28
30 __PT_R8 = __PT_GPRS + 32
31 __PT_R9 = __PT_GPRS + 36
32 __PT_R10 = __PT_GPRS + 40
33 __PT_R11 = __PT_GPRS + 44
34 __PT_R12 = __PT_GPRS + 48
35 __PT_R13 = __PT_GPRS + 524
36 __PT_R14 = __PT_GPRS + 56
37 __PT_R15 = __PT_GPRS + 60
39 _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
40 _TIF_MCCK_PENDING | _TIF_PER_TRAP )
41 _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
43 _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
44 _TIF_SYSCALL_TRACEPOINT)
46 STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
47 STACK_SIZE = 1 << STACK_SHIFT
49 #define BASED(name) name-system_call(%r13)
52 #ifdef CONFIG_TRACE_IRQFLAGS
54 l %r1,BASED(.Lhardirqs_on)
55 basr %r14,%r1 # call trace_hardirqs_on_caller
60 #ifdef CONFIG_TRACE_IRQFLAGS
62 l %r1,BASED(.Lhardirqs_off)
63 basr %r14,%r1 # call trace_hardirqs_off_caller
67 .macro LOCKDEP_SYS_EXIT
69 tm __PT_PSW+1(%r11),0x01 # returning to user ?
71 l %r1,BASED(.Llockdep_sys_exit)
72 basr %r14,%r1 # call lockdep_sys_exit
76 .macro CHECK_STACK stacksize,savearea
77 #ifdef CONFIG_CHECK_STACK
78 tml %r15,\stacksize - CONFIG_STACK_GUARD
84 .macro SWITCH_ASYNC savearea,stack,shift
85 tmh %r8,0x0001 # interrupting from user ?
88 sl %r14,BASED(.Lcritical_start)
89 cl %r14,BASED(.Lcritical_length)
91 la %r11,\savearea # inside critical section, do cleanup
92 bras %r14,cleanup_critical
93 tmh %r8,0x0001 # retest problem state after cleanup
95 0: l %r14,\stack # are we already on the target stack?
99 CHECK_STACK 1<<\shift,\savearea
101 1: l %r15,\stack # load target stack
102 2: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
103 la %r11,STACK_FRAME_OVERHEAD(%r15)
106 .macro ADD64 high,low,timer
113 .macro SUB64 high,low,timer
120 .macro UPDATE_VTIME high,low,enter_timer
121 lm \high,\low,__LC_EXIT_TIMER
122 SUB64 \high,\low,\enter_timer
123 ADD64 \high,\low,__LC_USER_TIMER
124 stm \high,\low,__LC_USER_TIMER
125 lm \high,\low,__LC_LAST_UPDATE_TIMER
126 SUB64 \high,\low,__LC_EXIT_TIMER
127 ADD64 \high,\low,__LC_SYSTEM_TIMER
128 stm \high,\low,__LC_SYSTEM_TIMER
129 mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer
133 st %r8,__LC_RETURN_PSW
134 ni __LC_RETURN_PSW,0xbf
138 .section .kprobes.text, "ax"
141 * Scheduler resume function, called by switch_to
142 * gpr2 = (task_struct *) prev
143 * gpr3 = (task_struct *) next
148 l %r4,__THREAD_info(%r2) # get thread_info of prev
149 l %r5,__THREAD_info(%r3) # get thread_info of next
150 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
152 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
153 oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next
154 0: stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
155 st %r15,__THREAD_ksp(%r2) # store kernel stack of prev
156 l %r15,__THREAD_ksp(%r3) # load kernel stack of next
157 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
158 lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
159 st %r3,__LC_CURRENT # store task struct of next
160 mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next
161 st %r5,__LC_THREAD_INFO # store thread info of next
162 ahi %r5,STACK_SIZE # end of kernel stack of next
163 st %r5,__LC_KERNEL_STACK # store end of kernel stack
168 * SVC interrupt handler routine. System calls are synchronous events and
169 * are executed with interrupts enabled.
173 stpt __LC_SYNC_ENTER_TIMER
175 stm %r8,%r15,__LC_SAVE_AREA_SYNC
176 l %r12,__LC_THREAD_INFO
177 l %r13,__LC_SVC_NEW_PSW+4
179 l %r15,__LC_KERNEL_STACK
180 ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
181 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
183 UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER
184 stm %r0,%r7,__PT_R0(%r11)
185 mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC
186 mvc __PT_PSW(8,%r11),__LC_SVC_OLD_PSW
187 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
189 oi __TI_flags+3(%r12),_TIF_SYSCALL
190 lh %r8,__PT_INT_CODE+2(%r11)
191 sla %r8,2 # shift and test for svc0
193 # svc 0: system call number in %r1
194 cl %r1,BASED(.Lnr_syscalls)
196 sth %r1,__PT_INT_CODE+2(%r11)
200 l %r10,BASED(.Lsys_call_table) # 31 bit system call table
201 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
202 st %r2,__PT_ORIG_GPR2(%r11)
203 st %r7,STACK_FRAME_OVERHEAD(%r15)
204 l %r9,0(%r8,%r10) # get system call addr.
205 tm __TI_flags+2(%r12),_TIF_TRACE >> 8
207 basr %r14,%r9 # call sys_xxxx
208 st %r2,__PT_R2(%r11) # store return value
213 tm __PT_PSW+1(%r11),0x01 # returning to user ?
215 tm __TI_flags+3(%r12),_TIF_WORK_SVC
216 jnz sysc_work # check for work
217 ni __TI_flags+3(%r12),255-_TIF_SYSCALL
219 mvc __LC_RETURN_PSW(8),__PT_PSW(%r11)
221 lm %r0,%r15,__PT_R0(%r11)
226 # One of the work bits is on. Find out which one.
229 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING
231 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED
233 tm __TI_flags+3(%r12),_TIF_SIGPENDING
235 tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME
236 jo sysc_notify_resume
237 tm __TI_flags+3(%r12),_TIF_PER_TRAP
239 j sysc_return # beware of critical section cleanup
242 # _TIF_NEED_RESCHED is set, call schedule
245 l %r1,BASED(.Lschedule)
246 la %r14,BASED(sysc_return)
247 br %r1 # call schedule
250 # _TIF_MCCK_PENDING is set, call handler
253 l %r1,BASED(.Lhandle_mcck)
254 la %r14,BASED(sysc_return)
255 br %r1 # TIF bit will be cleared by handler
258 # _TIF_SIGPENDING is set, call do_signal
261 ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
262 lr %r2,%r11 # pass pointer to pt_regs
263 l %r1,BASED(.Ldo_signal)
264 basr %r14,%r1 # call do_signal
265 tm __TI_flags+3(%r12),_TIF_SYSCALL
267 lm %r2,%r7,__PT_R2(%r11) # load svc arguments
268 xr %r8,%r8 # svc 0 returns -ENOSYS
269 clc __PT_INT_CODE+2(2,%r11),BASED(.Lnr_syscalls+2)
270 jnl sysc_nr_ok # invalid svc number -> do svc 0
271 lh %r8,__PT_INT_CODE+2(%r11) # load new svc number
273 j sysc_nr_ok # restart svc
276 # _TIF_NOTIFY_RESUME is set, call do_notify_resume
279 lr %r2,%r11 # pass pointer to pt_regs
280 l %r1,BASED(.Ldo_notify_resume)
281 la %r14,BASED(sysc_return)
282 br %r1 # call do_notify_resume
285 # _TIF_PER_TRAP is set, call do_per_trap
288 ni __TI_flags+3(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP)
289 lr %r2,%r11 # pass pointer to pt_regs
290 l %r1,BASED(.Ldo_per_trap)
291 la %r14,BASED(sysc_return)
292 br %r1 # call do_per_trap
295 # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
296 # and after the system call
299 l %r1,BASED(.Ltrace_enter)
300 lr %r2,%r11 # pass pointer to pt_regs
303 icm %r0,3,__PT_INT_CODE+2(%r11)
305 basr %r14,%r1 # call do_syscall_trace_enter
306 cl %r2,BASED(.Lnr_syscalls)
312 lm %r3,%r7,__PT_R3(%r11)
313 st %r7,STACK_FRAME_OVERHEAD(%r15)
314 l %r2,__PT_ORIG_GPR2(%r11)
315 basr %r14,%r9 # call sys_xxx
316 st %r2,__PT_R2(%r11) # store return value
318 tm __TI_flags+2(%r12),_TIF_TRACE >> 8
320 l %r1,BASED(.Ltrace_exit)
321 lr %r2,%r11 # pass pointer to pt_regs
322 la %r14,BASED(sysc_return)
323 br %r1 # call do_syscall_trace_exit
326 # a new process exits the kernel with ret_from_fork
329 la %r11,STACK_FRAME_OVERHEAD(%r15)
330 l %r12,__LC_THREAD_INFO
331 l %r13,__LC_SVC_NEW_PSW+4
332 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
334 st %r15,__PT_R15(%r11) # store stack pointer for new kthread
335 0: l %r1,BASED(.Lschedule_tail)
336 basr %r14,%r1 # call schedule_tail
338 ssm __LC_SVC_NEW_PSW # reenable interrupts
342 # kernel_execve function needs to deal with pt_regs that is not
346 stm %r12,%r15,48(%r15)
348 l %r13,__LC_SVC_NEW_PSW+4
349 ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
350 st %r14,__SF_BACKCHAIN(%r15)
351 la %r12,STACK_FRAME_OVERHEAD(%r15)
352 xc 0(__PT_SIZE,%r12),0(%r12)
353 l %r1,BASED(.Ldo_execve)
355 basr %r14,%r1 # call do_execve
358 ahi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE)
359 lm %r12,%r15,48(%r15)
362 0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
363 l %r15,__LC_KERNEL_STACK # load ksp
364 ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
365 la %r11,STACK_FRAME_OVERHEAD(%r15)
366 mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs
367 l %r12,__LC_THREAD_INFO
368 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
369 ssm __LC_SVC_NEW_PSW # reenable interrupts
370 l %r1,BASED(.Lexecve_tail)
371 basr %r14,%r1 # call execve_tail
375 * Program check handler routine
378 ENTRY(pgm_check_handler)
379 stpt __LC_SYNC_ENTER_TIMER
380 stm %r8,%r15,__LC_SAVE_AREA_SYNC
381 l %r12,__LC_THREAD_INFO
382 l %r13,__LC_SVC_NEW_PSW+4
383 lm %r8,%r9,__LC_PGM_OLD_PSW
384 tmh %r8,0x0001 # test problem state bit
385 jnz 1f # -> fault in user space
386 tmh %r8,0x4000 # PER bit set in old PSW ?
387 jnz 0f # -> enabled, can't be a double fault
388 tm __LC_PGM_ILC+3,0x80 # check for per exception
389 jnz pgm_svcper # -> single stepped svc
390 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
392 1: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER
393 l %r15,__LC_KERNEL_STACK
394 2: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
395 la %r11,STACK_FRAME_OVERHEAD(%r15)
396 stm %r0,%r7,__PT_R0(%r11)
397 mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC
398 stm %r8,%r9,__PT_PSW(%r11)
399 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
400 mvc __PT_INT_PARM_LONG(4,%r11),__LC_TRANS_EXC_CODE
401 tm __LC_PGM_ILC+3,0x80 # check for per exception
403 l %r1,__TI_task(%r12)
404 tmh %r8,0x0001 # kernel per event ?
406 oi __TI_flags+3(%r12),_TIF_PER_TRAP
407 mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS
408 mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE
409 mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID
411 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
412 l %r1,BASED(.Ljump_table)
414 n %r10,__PT_INT_CODE(%r11)
417 l %r1,0(%r10,%r1) # load address of handler routine
418 lr %r2,%r11 # pass pointer to pt_regs
419 basr %r14,%r1 # branch to interrupt-handler
423 # PER event in supervisor state, must be kprobes
427 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
428 l %r1,BASED(.Ldo_per_trap)
429 lr %r2,%r11 # pass pointer to pt_regs
430 basr %r14,%r1 # call do_per_trap
434 # single stepped system call
437 oi __TI_flags+3(%r12),_TIF_PER_TRAP
438 mvc __LC_RETURN_PSW(4),__LC_SVC_NEW_PSW
439 mvc __LC_RETURN_PSW+4(4),BASED(.Lsysc_per)
440 lpsw __LC_RETURN_PSW # branch to sysc_per and enable irqs
443 * IO interrupt handler routine
446 ENTRY(io_int_handler)
448 stpt __LC_ASYNC_ENTER_TIMER
449 stm %r8,%r15,__LC_SAVE_AREA_ASYNC
450 l %r12,__LC_THREAD_INFO
451 l %r13,__LC_SVC_NEW_PSW+4
452 lm %r8,%r9,__LC_IO_OLD_PSW
453 tmh %r8,0x0001 # interrupting from user ?
455 UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER
457 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
458 stm %r0,%r7,__PT_R0(%r11)
459 mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC
460 stm %r8,%r9,__PT_PSW(%r11)
462 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
463 l %r1,BASED(.Ldo_IRQ)
464 lr %r2,%r11 # pass pointer to pt_regs
465 basr %r14,%r1 # call do_IRQ
470 tm __TI_flags+3(%r12),_TIF_WORK_INT
471 jnz io_work # there is work to do (signals etc.)
473 mvc __LC_RETURN_PSW(8),__PT_PSW(%r11)
475 lm %r0,%r15,__PT_R0(%r11)
480 # There is work todo, find out in which context we have been interrupted:
481 # 1) if we return to user space we can do all _TIF_WORK_INT work
482 # 2) if we return to kernel code and preemptive scheduling is enabled check
483 # the preemption counter and if it is zero call preempt_schedule_irq
484 # Before any work can be done, a switch to the kernel stack is required.
487 tm __PT_PSW+1(%r11),0x01 # returning to user ?
488 jo io_work_user # yes -> do resched & signal
489 #ifdef CONFIG_PREEMPT
490 # check for preemptive scheduling
491 icm %r0,15,__TI_precount(%r12)
492 jnz io_restore # preemption disabled
493 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED
495 # switch to kernel stack
497 ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
498 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
499 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1)
500 la %r11,STACK_FRAME_OVERHEAD(%r1)
502 # TRACE_IRQS_ON already done at io_return, call
503 # TRACE_IRQS_OFF to keep things symmetrical
505 l %r1,BASED(.Lpreempt_irq)
506 basr %r14,%r1 # call preempt_schedule_irq
513 # Need to do work before returning to userspace, switch to kernel stack
516 l %r1,__LC_KERNEL_STACK
517 ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
518 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
519 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1)
520 la %r11,STACK_FRAME_OVERHEAD(%r1)
524 # One of the work bits is on. Find out which one.
525 # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED
526 # and _TIF_MCCK_PENDING
529 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING
531 tm __TI_flags+3(%r12),_TIF_NEED_RESCHED
533 tm __TI_flags+3(%r12),_TIF_SIGPENDING
535 tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME
537 j io_return # beware of critical section cleanup
540 # _TIF_MCCK_PENDING is set, call handler
543 # TRACE_IRQS_ON already done at io_return
544 l %r1,BASED(.Lhandle_mcck)
545 basr %r14,%r1 # TIF bit will be cleared by handler
550 # _TIF_NEED_RESCHED is set, call schedule
553 # TRACE_IRQS_ON already done at io_return
554 l %r1,BASED(.Lschedule)
555 ssm __LC_SVC_NEW_PSW # reenable interrupts
556 basr %r14,%r1 # call scheduler
557 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
562 # _TIF_SIGPENDING is set, call do_signal
565 # TRACE_IRQS_ON already done at io_return
566 l %r1,BASED(.Ldo_signal)
567 ssm __LC_SVC_NEW_PSW # reenable interrupts
568 lr %r2,%r11 # pass pointer to pt_regs
569 basr %r14,%r1 # call do_signal
570 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
575 # _TIF_SIGPENDING is set, call do_signal
578 # TRACE_IRQS_ON already done at io_return
579 l %r1,BASED(.Ldo_notify_resume)
580 ssm __LC_SVC_NEW_PSW # reenable interrupts
581 lr %r2,%r11 # pass pointer to pt_regs
582 basr %r14,%r1 # call do_notify_resume
583 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
588 * External interrupt handler routine
591 ENTRY(ext_int_handler)
593 stpt __LC_ASYNC_ENTER_TIMER
594 stm %r8,%r15,__LC_SAVE_AREA_ASYNC
595 l %r12,__LC_THREAD_INFO
596 l %r13,__LC_SVC_NEW_PSW+4
597 lm %r8,%r9,__LC_EXT_OLD_PSW
598 tmh %r8,0x0001 # interrupting from user ?
600 UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER
602 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
603 stm %r0,%r7,__PT_R0(%r11)
604 mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC
605 stm %r8,%r9,__PT_PSW(%r11)
607 lr %r2,%r11 # pass pointer to pt_regs
608 l %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code
609 l %r4,__LC_EXT_PARAMS # get external parameters
610 l %r1,BASED(.Ldo_extint)
611 basr %r14,%r1 # call do_extint
615 * Load idle PSW. The second "half" of this function is in cleanup_idle.
618 st %r4,__SF_EMPTY(%r15)
620 la %r1,psw_idle_lpsw+4-.(%r1)
621 st %r1,__SF_EMPTY+4(%r15)
622 oi __SF_EMPTY+4(%r15),0x80
623 la %r1,.Lvtimer_max-psw_idle_lpsw-4(%r1)
624 stck __IDLE_ENTER(%r2)
626 stpt __VQ_IDLE_ENTER(%r3)
630 lpsw __SF_EMPTY(%r15)
637 * Machine check handler routines
640 ENTRY(mcck_int_handler)
642 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer
643 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs
644 l %r12,__LC_THREAD_INFO
645 l %r13,__LC_SVC_NEW_PSW+4
646 lm %r8,%r9,__LC_MCK_OLD_PSW
647 tm __LC_MCCK_CODE,0x80 # system damage?
648 jo mcck_panic # yes -> rest of mcck code invalid
649 la %r14,__LC_CPU_TIMER_SAVE_AREA
650 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
651 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
653 la %r14,__LC_SYNC_ENTER_TIMER
654 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
656 la %r14,__LC_ASYNC_ENTER_TIMER
657 0: clc 0(8,%r14),__LC_EXIT_TIMER
659 la %r14,__LC_EXIT_TIMER
660 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
662 la %r14,__LC_LAST_UPDATE_TIMER
664 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
665 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
666 jno mcck_panic # no -> skip cleanup critical
667 tm %r8,0x0001 # interrupting from user ?
669 UPDATE_VTIME %r14,%r15,__LC_MCCK_ENTER_TIMER
671 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+32,__LC_PANIC_STACK,PAGE_SHIFT
672 mvc __PT_R0(64,%r11),__LC_GPREGS_SAVE_AREA
673 stm %r8,%r9,__PT_PSW(%r11)
674 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
675 l %r1,BASED(.Ldo_machine_check)
676 lr %r2,%r11 # pass pointer to pt_regs
677 basr %r14,%r1 # call s390_do_machine_check
678 tm __PT_PSW+1(%r11),0x01 # returning to user ?
680 l %r1,__LC_KERNEL_STACK # switch to kernel stack
681 ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
682 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
683 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1)
684 la %r11,STACK_FRAME_OVERHEAD(%r15)
686 ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off
687 tm __TI_flags+3(%r12),_TIF_MCCK_PENDING
690 l %r1,BASED(.Lhandle_mcck)
691 basr %r14,%r1 # call s390_handle_mcck
694 mvc __LC_RETURN_MCCK_PSW(8),__PT_PSW(%r11) # move return PSW
695 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
697 lm %r0,%r15,__PT_R0(%r11)
699 lpsw __LC_RETURN_MCCK_PSW
700 0: lm %r0,%r15,__PT_R0(%r11)
701 lpsw __LC_RETURN_MCCK_PSW
704 l %r14,__LC_PANIC_STACK
708 l %r15,__LC_PANIC_STACK
709 0: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
713 # PSW restart interrupt handler
715 ENTRY(restart_int_handler)
716 st %r15,__LC_SAVE_AREA_RESTART
717 l %r15,__LC_RESTART_STACK
718 ahi %r15,-__PT_SIZE # create pt_regs on stack
719 xc 0(__PT_SIZE,%r15),0(%r15)
720 stm %r0,%r14,__PT_R0(%r15)
721 mvc __PT_R15(4,%r15),__LC_SAVE_AREA_RESTART
722 mvc __PT_PSW(8,%r15),__LC_RST_OLD_PSW # store restart old psw
723 ahi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack
724 xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
725 lm %r1,%r3,__LC_RESTART_FN # load fn, parm & source cpu
726 ltr %r3,%r3 # test source cpu address
727 jm 1f # negative -> skip source stop
728 0: sigp %r4,%r3,1 # sigp sense to source cpu
729 brc 10,0b # wait for status stored
730 1: basr %r14,%r1 # call function
731 stap __SF_EMPTY(%r15) # store cpu address
732 lh %r3,__SF_EMPTY(%r15)
733 2: sigp %r4,%r3,5 # sigp stop to current cpu
737 .section .kprobes.text, "ax"
739 #ifdef CONFIG_CHECK_STACK
741 * The synchronous or the asynchronous stack overflowed. We are dead.
742 * No need to properly save the registers, we are going to panic anyway.
743 * Setup a pt_regs so that show_trace can provide a good call trace.
746 l %r15,__LC_PANIC_STACK # change to panic stack
747 ahi %r15,-__PT_SIZE # create pt_regs
748 stm %r0,%r7,__PT_R0(%r15)
749 stm %r8,%r9,__PT_PSW(%r15)
750 mvc __PT_R8(32,%r11),0(%r14)
752 ahi %r15,-STACK_FRAME_OVERHEAD
754 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
755 lr %r2,%r11 # pass pointer to pt_regs
756 br %r1 # branch to kernel_stack_overflow
757 1: .long kernel_stack_overflow
761 .long system_call + 0x80000000
762 .long sysc_do_svc + 0x80000000
763 .long sysc_tif + 0x80000000
764 .long sysc_restore + 0x80000000
765 .long sysc_done + 0x80000000
766 .long io_tif + 0x80000000
767 .long io_restore + 0x80000000
768 .long io_done + 0x80000000
769 .long psw_idle + 0x80000000
770 .long psw_idle_end + 0x80000000
773 cl %r9,BASED(cleanup_table) # system_call
775 cl %r9,BASED(cleanup_table+4) # sysc_do_svc
776 jl cleanup_system_call
777 cl %r9,BASED(cleanup_table+8) # sysc_tif
779 cl %r9,BASED(cleanup_table+12) # sysc_restore
781 cl %r9,BASED(cleanup_table+16) # sysc_done
782 jl cleanup_sysc_restore
783 cl %r9,BASED(cleanup_table+20) # io_tif
785 cl %r9,BASED(cleanup_table+24) # io_restore
787 cl %r9,BASED(cleanup_table+28) # io_done
788 jl cleanup_io_restore
789 cl %r9,BASED(cleanup_table+32) # psw_idle
791 cl %r9,BASED(cleanup_table+36) # psw_idle_end
796 # check if stpt has been executed
797 cl %r9,BASED(cleanup_system_call_insn)
799 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
800 chi %r11,__LC_SAVE_AREA_ASYNC
802 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
803 0: # check if stm has been executed
804 cl %r9,BASED(cleanup_system_call_insn+4)
806 mvc __LC_SAVE_AREA_SYNC(32),0(%r11)
807 0: # set up saved registers r12, and r13
808 st %r12,16(%r11) # r12 thread-info pointer
809 st %r13,20(%r11) # r13 literal-pool pointer
810 # check if the user time calculation has been done
811 cl %r9,BASED(cleanup_system_call_insn+8)
813 l %r10,__LC_EXIT_TIMER
814 l %r15,__LC_EXIT_TIMER+4
815 SUB64 %r10,%r15,__LC_SYNC_ENTER_TIMER
816 ADD64 %r10,%r15,__LC_USER_TIMER
817 st %r10,__LC_USER_TIMER
818 st %r15,__LC_USER_TIMER+4
819 0: # check if the system time calculation has been done
820 cl %r9,BASED(cleanup_system_call_insn+12)
822 l %r10,__LC_LAST_UPDATE_TIMER
823 l %r15,__LC_LAST_UPDATE_TIMER+4
824 SUB64 %r10,%r15,__LC_EXIT_TIMER
825 ADD64 %r10,%r15,__LC_SYSTEM_TIMER
826 st %r10,__LC_SYSTEM_TIMER
827 st %r15,__LC_SYSTEM_TIMER+4
828 0: # update accounting time stamp
829 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
830 # set up saved register 11
831 l %r15,__LC_KERNEL_STACK
833 st %r15,12(%r11) # r11 pt_regs pointer
835 mvc __PT_R8(32,%r15),__LC_SAVE_AREA_SYNC
836 stm %r0,%r7,__PT_R0(%r15)
837 mvc __PT_PSW(8,%r15),__LC_SVC_OLD_PSW
838 mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC
839 # setup saved register 15
840 ahi %r15,-STACK_FRAME_OVERHEAD
841 st %r15,28(%r11) # r15 stack pointer
842 # set new psw address and exit
843 l %r9,BASED(cleanup_table+4) # sysc_do_svc + 0x80000000
845 cleanup_system_call_insn:
846 .long system_call + 0x80000000
847 .long sysc_stm + 0x80000000
848 .long sysc_vtime + 0x80000000 + 36
849 .long sysc_vtime + 0x80000000 + 76
852 l %r9,BASED(cleanup_table+8) # sysc_tif + 0x80000000
855 cleanup_sysc_restore:
856 cl %r9,BASED(cleanup_sysc_restore_insn)
858 l %r9,12(%r11) # get saved pointer to pt_regs
859 mvc __LC_RETURN_PSW(8),__PT_PSW(%r9)
860 mvc 0(32,%r11),__PT_R8(%r9)
861 lm %r0,%r7,__PT_R0(%r9)
862 0: lm %r8,%r9,__LC_RETURN_PSW
864 cleanup_sysc_restore_insn:
865 .long sysc_done - 4 + 0x80000000
868 l %r9,BASED(cleanup_table+20) # io_tif + 0x80000000
872 cl %r9,BASED(cleanup_io_restore_insn)
874 l %r9,12(%r11) # get saved r11 pointer to pt_regs
875 mvc __LC_RETURN_PSW(8),__PT_PSW(%r9)
876 mvc 0(32,%r11),__PT_R8(%r9)
877 lm %r0,%r7,__PT_R0(%r9)
878 0: lm %r8,%r9,__LC_RETURN_PSW
880 cleanup_io_restore_insn:
881 .long io_done - 4 + 0x80000000
884 # copy interrupt clock & cpu timer
885 mvc __IDLE_EXIT(8,%r2),__LC_INT_CLOCK
886 mvc __VQ_IDLE_EXIT(8,%r3),__LC_ASYNC_ENTER_TIMER
887 chi %r11,__LC_SAVE_AREA_ASYNC
889 mvc __IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
890 mvc __VQ_IDLE_EXIT(8,%r3),__LC_MCCK_ENTER_TIMER
891 0: # check if stck has been executed
892 cl %r9,BASED(cleanup_idle_insn)
894 mvc __IDLE_ENTER(8,%r2),__IDLE_EXIT(%r2)
895 mvc __VQ_IDLE_ENTER(8,%r3),__VQ_IDLE_EXIT(%r3)
897 1: # check if the cpu timer has been reprogrammed
900 spt __VQ_IDLE_ENTER(%r3)
901 2: # account system time going idle
902 lm %r9,%r10,__LC_STEAL_TIMER
903 ADD64 %r9,%r10,__IDLE_ENTER(%r2)
904 SUB64 %r9,%r10,__LC_LAST_UPDATE_CLOCK
905 stm %r9,%r10,__LC_STEAL_TIMER
906 mvc __LC_LAST_UPDATE_CLOCK(8),__IDLE_EXIT(%r2)
907 lm %r9,%r10,__LC_SYSTEM_TIMER
908 ADD64 %r9,%r10,__LC_LAST_UPDATE_TIMER
909 SUB64 %r9,%r10,__VQ_IDLE_ENTER(%r3)
910 stm %r9,%r10,__LC_SYSTEM_TIMER
911 mvc __LC_LAST_UPDATE_TIMER(8),__VQ_IDLE_EXIT(%r3)
913 n %r8,BASED(cleanup_idle_wait) # clear wait state bit
914 l %r9,24(%r11) # return from psw_idle
917 .long psw_idle_lpsw + 0x80000000
928 .quad 0x7fffffffffffffff
933 .Ldo_machine_check: .long s390_do_machine_check
934 .Lhandle_mcck: .long s390_handle_mcck
935 .Ldo_IRQ: .long do_IRQ
936 .Ldo_extint: .long do_extint
937 .Ldo_signal: .long do_signal
938 .Ldo_notify_resume: .long do_notify_resume
939 .Ldo_per_trap: .long do_per_trap
940 .Ldo_execve: .long do_execve
941 .Lexecve_tail: .long execve_tail
942 .Ljump_table: .long pgm_check_table
943 .Lschedule: .long schedule
944 #ifdef CONFIG_PREEMPT
945 .Lpreempt_irq: .long preempt_schedule_irq
947 .Ltrace_enter: .long do_syscall_trace_enter
948 .Ltrace_exit: .long do_syscall_trace_exit
949 .Lschedule_tail: .long schedule_tail
950 .Lsys_call_table: .long sys_call_table
951 .Lsysc_per: .long sysc_per + 0x80000000
952 #ifdef CONFIG_TRACE_IRQFLAGS
953 .Lhardirqs_on: .long trace_hardirqs_on_caller
954 .Lhardirqs_off: .long trace_hardirqs_off_caller
956 #ifdef CONFIG_LOCKDEP
957 .Llockdep_sys_exit: .long lockdep_sys_exit
959 .Lcritical_start: .long __critical_start + 0x80000000
960 .Lcritical_length: .long __critical_end - __critical_start
962 .section .rodata, "a"
963 #define SYSCALL(esa,esame,emu) .long esa
964 .globl sys_call_table
966 #include "syscalls.S"