2 * arch/s390/kernel/entry64.S
3 * S390 low-level entry points.
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>
12 #include <linux/sys.h>
13 #include <linux/linkage.h>
14 #include <asm/cache.h>
15 #include <asm/lowcore.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>
24 * Stack layout for the system_call stack entry.
25 * The first few entries are identical to the user_regs_struct.
27 SP_PTREGS = STACK_FRAME_OVERHEAD
28 SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS
29 SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
30 SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS
31 SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
32 SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
33 SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
34 SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
35 SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
36 SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
37 SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
38 SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 64
39 SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 72
40 SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 80
41 SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 88
42 SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 96
43 SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 104
44 SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 112
45 SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 120
46 SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
47 SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC
48 SP_TRAP = STACK_FRAME_OVERHEAD + __PT_TRAP
49 SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
51 STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
52 STACK_SIZE = 1 << STACK_SHIFT
54 _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
55 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
56 _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
59 #define BASED(name) name-system_call(%r13)
61 #ifdef CONFIG_TRACE_IRQFLAGS
63 brasl %r14,trace_hardirqs_on
67 brasl %r14,trace_hardirqs_off
71 #define TRACE_IRQS_OFF
74 .macro STORE_TIMER lc_offset
75 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
80 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
81 .macro UPDATE_VTIME lc_from,lc_to,lc_sum
90 * Register usage in interrupt handlers:
91 * R9 - pointer to current task structure
92 * R13 - pointer to literal pool
93 * R14 - return register for function calls
94 * R15 - kernel stack pointer
97 .macro SAVE_ALL_BASE savearea
98 stmg %r12,%r15,\savearea
102 .macro SAVE_ALL_SYNC psworg,savearea
104 tm \psworg+1,0x01 # test problem state bit
105 jz 2f # skip stack setup save
106 lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
107 #ifdef CONFIG_CHECK_STACK
109 2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
116 .macro SAVE_ALL_ASYNC psworg,savearea
118 tm \psworg+1,0x01 # test problem state bit
119 jnz 1f # from user -> load kernel stack
120 clc \psworg+8(8),BASED(.Lcritical_end)
122 clc \psworg+8(8),BASED(.Lcritical_start)
124 brasl %r14,cleanup_critical
125 tm 1(%r12),0x01 # retest problem state after cleanup
127 0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ?
129 srag %r14,%r14,STACK_SHIFT
131 1: lg %r15,__LC_ASYNC_STACK # load async stack
132 #ifdef CONFIG_CHECK_STACK
134 2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
141 .macro CREATE_STACK_FRAME psworg,savearea
142 aghi %r15,-SP_SIZE # make room for registers & psw
143 mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
145 stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
146 icm %r12,12,__LC_SVC_ILC
147 stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
149 mvc SP_R12(32,%r15),\savearea # move %r12-%r15 to stack
151 stg %r12,__SF_BACKCHAIN(%r15)
154 .macro RESTORE_ALL psworg,sync
155 mvc \psworg(16),SP_PSW(%r15) # move user PSW to lowcore
157 ni \psworg+1,0xfd # clear wait state bit
159 lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
160 STORE_TIMER __LC_EXIT_TIMER
161 lpswe \psworg # back to caller
165 * Scheduler resume function, called by switch_to
166 * gpr2 = (task_struct *) prev
167 * gpr3 = (task_struct *) next
173 tm __THREAD_per+4(%r3),0xe8 # is the new process using per ?
174 jz __switch_to_noper # if not we're fine
175 stctg %c9,%c11,__SF_EMPTY(%r15)# We are using per stuff
176 clc __THREAD_per(24,%r3),__SF_EMPTY(%r15)
177 je __switch_to_noper # we got away without bashing TLB's
178 lctlg %c9,%c11,__THREAD_per(%r3) # Nope we didn't
180 lg %r4,__THREAD_info(%r2) # get thread_info of prev
181 tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
182 jz __switch_to_no_mcck
183 ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
184 lg %r4,__THREAD_info(%r3) # get thread_info of next
185 oi __TI_flags+7(%r4),_TIF_MCCK_PENDING # set it in next
187 stmg %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
188 stg %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
189 lg %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
190 lmg %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
191 stg %r3,__LC_CURRENT # __LC_CURRENT = current task struct
192 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
193 lg %r3,__THREAD_info(%r3) # load thread_info from task struct
194 stg %r3,__LC_THREAD_INFO
196 stg %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
201 * SVC interrupt handler routine. System calls are synchronous events and
202 * are executed with interrupts enabled.
207 STORE_TIMER __LC_SYNC_ENTER_TIMER
209 SAVE_ALL_BASE __LC_SAVE_AREA
210 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
211 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
212 llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
213 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
215 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
217 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
219 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
221 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
224 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
225 slag %r7,%r7,2 # *4 and test for svc 0
227 # svc 0: system call number in %r1
228 cl %r1,BASED(.Lnr_syscalls)
230 lgfr %r7,%r1 # clear high word in r1
231 slag %r7,%r7,2 # svc 0: system call number in %r1
233 mvc SP_ARGS(8,%r15),SP_R7(%r15)
235 larl %r10,sys_call_table
237 tm __TI_flags+5(%r9),(_TIF_31BIT>>16) # running in 31 bit mode ?
239 larl %r10,sys_call_table_emu # use 31 bit emulation system calls
242 tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
243 lgf %r8,0(%r7,%r10) # load address of system call routine
245 basr %r14,%r8 # call sys_xxxx
246 stg %r2,SP_R2(%r15) # store return value (change R2 on stack)
249 tm SP_PSW+1(%r15),0x01 # returning to user ?
251 tm __TI_flags+7(%r9),_TIF_WORK_SVC
252 jnz sysc_work # there is work to do (signals etc.)
254 RESTORE_ALL __LC_RETURN_PSW,1
257 # recheck if there is more work to do
260 tm __TI_flags+7(%r9),_TIF_WORK_SVC
261 jz sysc_leave # there is no work to do
263 # One of the work bits is on. Find out which one.
266 tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
268 tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
270 tm __TI_flags+7(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
272 tm __TI_flags+7(%r9),_TIF_RESTART_SVC
274 tm __TI_flags+7(%r9),_TIF_SINGLE_STEP
279 # _TIF_NEED_RESCHED is set, call schedule
282 larl %r14,sysc_work_loop
283 jg schedule # return point is sysc_return
286 # _TIF_MCCK_PENDING is set, call handler
289 larl %r14,sysc_work_loop
290 jg s390_handle_mcck # TIF bit will be cleared by handler
293 # _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
296 ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
297 la %r2,SP_PTREGS(%r15) # load pt_regs
298 brasl %r14,do_signal # call do_signal
299 tm __TI_flags+7(%r9),_TIF_RESTART_SVC
301 tm __TI_flags+7(%r9),_TIF_SINGLE_STEP
306 # _TIF_RESTART_SVC is set, set up registers and restart svc
309 ni __TI_flags+7(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
310 lg %r7,SP_R2(%r15) # load new svc number
312 mvc SP_R2(8,%r15),SP_ORIG_R2(%r15) # restore first argument
313 lmg %r2,%r6,SP_R2(%r15) # load svc arguments
314 j sysc_do_restart # restart svc
317 # _TIF_SINGLE_STEP is set, call do_single_step
320 ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
321 lhi %r0,__LC_PGM_OLD_PSW
322 sth %r0,SP_TRAP(%r15) # set trap indication to pgm check
323 la %r2,SP_PTREGS(%r15) # address of register-save area
324 larl %r14,sysc_return # load adr. of system return
325 jg do_single_step # branch to do_sigtrap
328 # call syscall_trace before and after system call
329 # special linkage: %r12 contains the return address for trace_svc
332 la %r2,SP_PTREGS(%r15) # load pt_regs
336 brasl %r14,syscall_trace
340 lg %r7,SP_R2(%r15) # strace might have changed the
341 sll %r7,2 # system call
344 lmg %r3,%r6,SP_R3(%r15)
345 lg %r2,SP_ORIG_R2(%r15)
346 basr %r14,%r8 # call sys_xxx
347 stg %r2,SP_R2(%r15) # store return value
349 tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
351 la %r2,SP_PTREGS(%r15) # load pt_regs
353 larl %r14,sysc_return # return point is sysc_return
357 # a new process exits the kernel with ret_from_fork
361 lg %r13,__LC_SVC_NEW_PSW+8
362 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
363 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ?
365 stg %r15,SP_R15(%r15) # store stack pointer for new kthread
366 0: brasl %r14,schedule_tail
368 stosm 24(%r15),0x03 # reenable interrupts
372 # kernel_execve function needs to deal with pt_regs that is not
377 stmg %r12,%r15,96(%r15)
380 stg %r14,__SF_BACKCHAIN(%r15)
381 la %r12,SP_PTREGS(%r15)
382 xc 0(__PT_SIZE,%r12),0(%r12)
388 lmg %r12,%r15,96(%r15)
391 0: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts
392 lg %r15,__LC_KERNEL_STACK # load ksp
393 aghi %r15,-SP_SIZE # make room for registers & psw
394 lg %r13,__LC_SVC_NEW_PSW+8
395 lg %r9,__LC_THREAD_INFO
396 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs
397 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
398 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
399 brasl %r14,execve_tail
403 * Program check handler routine
406 .globl pgm_check_handler
409 * First we need to check for a special case:
410 * Single stepping an instruction that disables the PER event mask will
411 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
412 * For a single stepped SVC the program check handler gets control after
413 * the SVC new PSW has been loaded. But we want to execute the SVC first and
414 * then handle the PER event. Therefore we update the SVC old PSW to point
415 * to the pgm_check_handler and branch to the SVC handler after we checked
416 * if we have to load the kernel stack register.
417 * For every other possible cause for PER event without the PER mask set
418 * we just ignore the PER event (FIXME: is there anything we have to do
421 STORE_TIMER __LC_SYNC_ENTER_TIMER
422 SAVE_ALL_BASE __LC_SAVE_AREA
423 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
424 jnz pgm_per # got per exception -> special case
425 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
426 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
427 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
428 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
430 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
431 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
432 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
435 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
436 lgf %r3,__LC_PGM_ILC # load program interruption code
441 larl %r1,pgm_check_table
442 lg %r1,0(%r8,%r1) # load address of handler routine
443 la %r2,SP_PTREGS(%r15) # address of register-save area
444 larl %r14,sysc_return
445 br %r1 # branch to interrupt-handler
448 # handle per exception
451 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on
452 jnz pgm_per_std # ok, normal per event from user space
453 # ok its one of the special cases, now we need to find out which one
454 clc __LC_PGM_OLD_PSW(16),__LC_SVC_NEW_PSW
456 # no interesting special case, ignore PER event
457 lmg %r12,%r15,__LC_SAVE_AREA
458 lpswe __LC_PGM_OLD_PSW
461 # Normal per exception
464 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
465 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
466 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
467 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
469 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
470 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
471 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
474 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
475 lg %r1,__TI_task(%r9)
476 tm SP_PSW+1(%r15),0x01 # kernel per event ?
478 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
479 mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
480 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
481 oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
482 lgf %r3,__LC_PGM_ILC # load program interruption code
484 ngr %r8,%r3 # clear per-event-bit and ilc
489 # it was a single stepped SVC that is causing all the trouble
492 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
493 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
494 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
495 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
497 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
498 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
499 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
502 llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
503 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
504 lg %r1,__TI_task(%r9)
505 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
506 mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
507 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
508 oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
510 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
514 # per was called from kernel, must be kprobes
517 lhi %r0,__LC_PGM_OLD_PSW
518 sth %r0,SP_TRAP(%r15) # set trap indication to pgm check
519 la %r2,SP_PTREGS(%r15) # address of register-save area
520 larl %r14,sysc_leave # load adr. of system ret, no work
521 jg do_single_step # branch to do_single_step
524 * IO interrupt handler routine
526 .globl io_int_handler
528 STORE_TIMER __LC_ASYNC_ENTER_TIMER
530 SAVE_ALL_BASE __LC_SAVE_AREA+32
531 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
532 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
533 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
534 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
536 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
537 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
538 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
541 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
543 la %r2,SP_PTREGS(%r15) # address of register-save area
544 brasl %r14,do_IRQ # call standard irq handler
548 tm SP_PSW+1(%r15),0x01 # returning to user ?
549 #ifdef CONFIG_PREEMPT
550 jno io_preempt # no -> check for preemptive scheduling
552 jno io_leave # no-> skip resched & signal
554 tm __TI_flags+7(%r9),_TIF_WORK_INT
555 jnz io_work # there is work to do (signals etc.)
557 RESTORE_ALL __LC_RETURN_PSW,0
560 #ifdef CONFIG_PREEMPT
562 icm %r0,15,__TI_precount(%r9)
564 # switch to kernel stack
567 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
568 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
571 tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
574 mvc __TI_precount(4,%r9),0(%r1)
575 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
576 brasl %r14,schedule # call schedule
577 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
578 xc __TI_precount(4,%r9),__TI_precount(%r9)
583 # switch to kernel stack, then check TIF bits
586 lg %r1,__LC_KERNEL_STACK
588 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
589 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
592 # One of the work bits is on. Find out which one.
593 # Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGPENDING, _TIF_NEED_RESCHED
594 # and _TIF_MCCK_PENDING
597 tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
599 tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
601 tm __TI_flags+7(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
606 # _TIF_MCCK_PENDING is set, call handler
609 larl %r14,io_work_loop
610 jg s390_handle_mcck # TIF bit will be cleared by handler
613 # _TIF_NEED_RESCHED is set, call schedule
616 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
617 brasl %r14,schedule # call scheduler
618 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
619 tm __TI_flags+7(%r9),_TIF_WORK_INT
620 jz io_leave # there is no work to do
624 # _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
627 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
628 la %r2,SP_PTREGS(%r15) # load pt_regs
629 brasl %r14,do_signal # call do_signal
630 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
634 * External interrupt handler routine
636 .globl ext_int_handler
638 STORE_TIMER __LC_ASYNC_ENTER_TIMER
640 SAVE_ALL_BASE __LC_SAVE_AREA+32
641 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
642 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
643 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
644 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
646 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
647 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
648 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
651 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
653 la %r2,SP_PTREGS(%r15) # address of register-save area
654 llgh %r3,__LC_EXT_INT_CODE # get interruption code
662 * Machine check handler routines
664 .globl mcck_int_handler
666 la %r1,4095 # revalidate r1
667 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
668 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
669 SAVE_ALL_BASE __LC_SAVE_AREA+64
670 la %r12,__LC_MCK_OLD_PSW
671 tm __LC_MCCK_CODE,0x80 # system damage?
672 jo mcck_int_main # yes -> rest of mcck code invalid
673 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
675 mvc __LC_SAVE_AREA+104(8),__LC_ASYNC_ENTER_TIMER
676 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r14)
677 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
679 la %r14,__LC_SYNC_ENTER_TIMER
680 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
682 la %r14,__LC_ASYNC_ENTER_TIMER
683 0: clc 0(8,%r14),__LC_EXIT_TIMER
685 la %r14,__LC_EXIT_TIMER
686 0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
688 la %r14,__LC_LAST_UPDATE_TIMER
690 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14)
693 tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
694 jno mcck_int_main # no -> skip cleanup critical
695 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
696 jnz mcck_int_main # from user -> load kernel stack
697 clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_end)
699 clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_start)
701 brasl %r14,cleanup_critical
703 lg %r14,__LC_PANIC_STACK # are we already on the panic stack?
705 srag %r14,%r14,PAGE_SHIFT
707 lg %r15,__LC_PANIC_STACK # load panic stack
708 0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64
709 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
710 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
711 jno mcck_no_vtime # no -> no timer update
712 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
714 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
715 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
716 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
719 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
720 la %r2,SP_PTREGS(%r15) # load pt_regs
721 brasl %r14,s390_do_machine_check
722 tm SP_PSW+1(%r15),0x01 # returning to user ?
724 lg %r1,__LC_KERNEL_STACK # switch to kernel stack
726 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
727 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
729 stosm __SF_EMPTY(%r15),0x04 # turn dat on
730 tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
733 brasl %r14,s390_handle_mcck
736 mvc __LC_RETURN_MCCK_PSW(16),SP_PSW(%r15) # move return PSW
737 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
738 lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15
739 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
740 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+104
741 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
746 lpswe __LC_RETURN_MCCK_PSW # back to caller
750 * Restart interruption handler, kick starter for additional CPUs
752 .globl restart_int_handler
754 lg %r15,__LC_SAVE_AREA+120 # load ksp
755 lghi %r10,__LC_CREGS_SAVE_AREA
756 lctlg %c0,%c15,0(%r10) # get new ctl regs
757 lghi %r10,__LC_AREGS_SAVE_AREA
759 lmg %r6,%r15,__SF_GPRS(%r15) # load registers from clone
760 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on
764 * If we do not run with SMP enabled, let the new CPU crash ...
766 .globl restart_int_handler
770 lpswe restart_crash-restart_base(%r1)
773 .long 0x000a0000,0x00000000,0x00000000,0x00000000
777 #ifdef CONFIG_CHECK_STACK
779 * The synchronous or the asynchronous stack overflowed. We are dead.
780 * No need to properly save the registers, we are going to panic anyway.
781 * Setup a pt_regs so that show_trace can provide a good call trace.
784 lg %r15,__LC_PANIC_STACK # change to panic stack
786 mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
787 stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
788 la %r1,__LC_SAVE_AREA
789 chi %r12,__LC_SVC_OLD_PSW
791 chi %r12,__LC_PGM_OLD_PSW
793 la %r1,__LC_SAVE_AREA+32
794 0: mvc SP_R12(32,%r15),0(%r1) # move %r12-%r15 to stack
795 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain
796 la %r2,SP_PTREGS(%r15) # load pt_regs
797 jg kernel_stack_overflow
800 cleanup_table_system_call:
801 .quad system_call, sysc_do_svc
802 cleanup_table_sysc_return:
803 .quad sysc_return, sysc_leave
804 cleanup_table_sysc_leave:
805 .quad sysc_leave, sysc_work_loop
806 cleanup_table_sysc_work_loop:
807 .quad sysc_work_loop, sysc_reschedule
808 cleanup_table_io_return:
809 .quad io_return, io_leave
810 cleanup_table_io_leave:
811 .quad io_leave, io_done
812 cleanup_table_io_work_loop:
813 .quad io_work_loop, io_mcck_pending
816 clc 8(8,%r12),BASED(cleanup_table_system_call)
818 clc 8(8,%r12),BASED(cleanup_table_system_call+8)
819 jl cleanup_system_call
821 clc 8(8,%r12),BASED(cleanup_table_sysc_return)
823 clc 8(8,%r12),BASED(cleanup_table_sysc_return+8)
824 jl cleanup_sysc_return
826 clc 8(8,%r12),BASED(cleanup_table_sysc_leave)
828 clc 8(8,%r12),BASED(cleanup_table_sysc_leave+8)
829 jl cleanup_sysc_leave
831 clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop)
833 clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)
834 jl cleanup_sysc_return
836 clc 8(8,%r12),BASED(cleanup_table_io_return)
838 clc 8(8,%r12),BASED(cleanup_table_io_return+8)
841 clc 8(8,%r12),BASED(cleanup_table_io_leave)
843 clc 8(8,%r12),BASED(cleanup_table_io_leave+8)
846 clc 8(8,%r12),BASED(cleanup_table_io_work_loop)
848 clc 8(8,%r12),BASED(cleanup_table_io_work_loop+8)
854 mvc __LC_RETURN_PSW(16),0(%r12)
855 cghi %r12,__LC_MCK_OLD_PSW
857 la %r12,__LC_SAVE_AREA+32
859 0: la %r12,__LC_SAVE_AREA+64
861 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
862 clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8)
864 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
865 0: clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16)
868 clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn)
870 mvc __LC_SAVE_AREA(32),0(%r12)
872 stg %r12,__LC_SAVE_AREA+96 # argh
873 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
874 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
875 lg %r12,__LC_SAVE_AREA+96 # argh
877 llgh %r7,__LC_SVC_INT_CODE
878 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
880 clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)
882 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
884 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
886 clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+32)
888 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
890 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
893 mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8)
894 la %r12,__LC_RETURN_PSW
896 cleanup_system_call_insn:
898 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
906 mvc __LC_RETURN_PSW(8),0(%r12)
907 mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return)
908 la %r12,__LC_RETURN_PSW
912 clc 8(8,%r12),BASED(cleanup_sysc_leave_insn)
914 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
915 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
916 clc 8(8,%r12),BASED(cleanup_sysc_leave_insn+8)
919 mvc __LC_RETURN_PSW(16),SP_PSW(%r15)
920 cghi %r12,__LC_MCK_OLD_PSW
922 mvc __LC_SAVE_AREA+64(32),SP_R12(%r15)
924 0: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15)
925 1: lmg %r0,%r11,SP_R0(%r15)
927 2: la %r12,__LC_RETURN_PSW
929 cleanup_sysc_leave_insn:
930 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
931 .quad sysc_leave + 16
933 .quad sysc_leave + 12
936 mvc __LC_RETURN_PSW(8),0(%r12)
937 mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_io_work_loop)
938 la %r12,__LC_RETURN_PSW
942 clc 8(8,%r12),BASED(cleanup_io_leave_insn)
944 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
945 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
946 clc 8(8,%r12),BASED(cleanup_io_leave_insn+8)
949 mvc __LC_RETURN_PSW(16),SP_PSW(%r15)
950 cghi %r12,__LC_MCK_OLD_PSW
952 mvc __LC_SAVE_AREA+64(32),SP_R12(%r15)
954 0: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15)
955 1: lmg %r0,%r11,SP_R0(%r15)
957 2: la %r12,__LC_RETURN_PSW
959 cleanup_io_leave_insn:
960 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
970 .Lc_pactive: .long PREEMPT_ACTIVE
971 .Lnr_syscalls: .long NR_syscalls
972 .L0x0130: .short 0x130
973 .L0x0140: .short 0x140
974 .L0x0150: .short 0x150
975 .L0x0160: .short 0x160
976 .L0x0170: .short 0x170
978 .quad __critical_start
982 .section .rodata, "a"
983 #define SYSCALL(esa,esame,emu) .long esame
985 #include "syscalls.S"
990 #define SYSCALL(esa,esame,emu) .long emu
992 #include "syscalls.S"