2 * S390 low-level entry points.
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
6 * Hartmut Penner (hp@de.ibm.com),
7 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
8 * Heiko Carstens <heiko.carstens@de.ibm.com>
11 #include <linux/init.h>
12 #include <linux/linkage.h>
13 #include <asm/processor.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>
25 __PT_R1 = __PT_GPRS + 8
26 __PT_R2 = __PT_GPRS + 16
27 __PT_R3 = __PT_GPRS + 24
28 __PT_R4 = __PT_GPRS + 32
29 __PT_R5 = __PT_GPRS + 40
30 __PT_R6 = __PT_GPRS + 48
31 __PT_R7 = __PT_GPRS + 56
32 __PT_R8 = __PT_GPRS + 64
33 __PT_R9 = __PT_GPRS + 72
34 __PT_R10 = __PT_GPRS + 80
35 __PT_R11 = __PT_GPRS + 88
36 __PT_R12 = __PT_GPRS + 96
37 __PT_R13 = __PT_GPRS + 104
38 __PT_R14 = __PT_GPRS + 112
39 __PT_R15 = __PT_GPRS + 120
41 STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
42 STACK_SIZE = 1 << STACK_SHIFT
43 STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
45 _TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED)
46 _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
47 _TIF_SYSCALL_TRACEPOINT)
48 _CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE)
49 _PIF_WORK = (_PIF_PER_TRAP)
51 #define BASED(name) name-system_call(%r13)
54 #ifdef CONFIG_TRACE_IRQFLAGS
56 brasl %r14,trace_hardirqs_on_caller
61 #ifdef CONFIG_TRACE_IRQFLAGS
63 brasl %r14,trace_hardirqs_off_caller
67 .macro LOCKDEP_SYS_EXIT
69 tm __PT_PSW+1(%r11),0x01 # returning to user ?
71 brasl %r14,lockdep_sys_exit
76 #if IS_ENABLED(CONFIG_KVM)
77 tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_LPP
79 .insn s,0xb2800000,\newpp
83 .macro HANDLE_SIE_INTERCEPT scratch,reason
84 #if IS_ENABLED(CONFIG_KVM)
85 tmhh %r8,0x0001 # interrupting from user ?
88 slg \scratch,BASED(.Lsie_critical)
89 clg \scratch,BASED(.Lsie_critical_length)
91 # Some program interrupts are suppressing (e.g. protection).
92 # We must also check the instruction after SIE in that case.
93 # do_protection_exception will rewind to rewind_pad
98 lg %r14,__SF_EMPTY(%r15) # get control block pointer
99 LPP __SF_EMPTY+16(%r15) # set host id
100 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
101 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
102 larl %r9,sie_exit # skip forward to sie_exit
103 mvi __SF_EMPTY+31(%r15),\reason # set exit reason
107 .macro CHECK_STACK stacksize,savearea
108 #ifdef CONFIG_CHECK_STACK
109 tml %r15,\stacksize - CONFIG_STACK_GUARD
115 .macro SWITCH_ASYNC savearea,stack,shift
116 tmhh %r8,0x0001 # interrupting from user ?
119 slg %r14,BASED(.Lcritical_start)
120 clg %r14,BASED(.Lcritical_length)
122 lghi %r11,\savearea # inside critical section, do cleanup
123 brasl %r14,cleanup_critical
124 tmhh %r8,0x0001 # retest problem state after cleanup
126 0: lg %r14,\stack # are we already on the target stack?
128 srag %r14,%r14,\shift
130 CHECK_STACK 1<<\shift,\savearea
131 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
133 1: lg %r15,\stack # load target stack
134 2: la %r11,STACK_FRAME_OVERHEAD(%r15)
137 .macro UPDATE_VTIME scratch,enter_timer
138 lg \scratch,__LC_EXIT_TIMER
139 slg \scratch,\enter_timer
140 alg \scratch,__LC_USER_TIMER
141 stg \scratch,__LC_USER_TIMER
142 lg \scratch,__LC_LAST_UPDATE_TIMER
143 slg \scratch,__LC_EXIT_TIMER
144 alg \scratch,__LC_SYSTEM_TIMER
145 stg \scratch,__LC_SYSTEM_TIMER
146 mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer
149 .macro LAST_BREAK scratch
150 srag \scratch,%r10,23
152 stg %r10,__TI_last_break(%r12)
156 stg %r8,__LC_RETURN_PSW
157 ni __LC_RETURN_PSW,0xbf
162 #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
163 .insn s,0xb27c0000,\savearea # store clock fast
165 .insn s,0xb2050000,\savearea # store clock
169 .section .kprobes.text, "ax"
172 * Scheduler resume function, called by switch_to
173 * gpr2 = (task_struct *) prev
174 * gpr3 = (task_struct *) next
179 stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
180 stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev
181 lg %r4,__THREAD_info(%r2) # get thread_info of prev
182 lg %r5,__THREAD_info(%r3) # get thread_info of next
184 aghi %r15,STACK_INIT # end of kernel stack of next
185 stg %r3,__LC_CURRENT # store task struct of next
186 stg %r5,__LC_THREAD_INFO # store thread info of next
187 stg %r15,__LC_KERNEL_STACK # store end of kernel stack
188 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
189 mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
190 lg %r15,__THREAD_ksp(%r3) # load kernel stack of next
191 lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
196 * SVC interrupt handler routine. System calls are synchronous events and
197 * are executed with interrupts enabled.
201 stpt __LC_SYNC_ENTER_TIMER
203 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
204 lg %r10,__LC_LAST_BREAK
205 lg %r12,__LC_THREAD_INFO
206 lghi %r14,_PIF_SYSCALL
208 lg %r15,__LC_KERNEL_STACK
209 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
211 UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER
213 stmg %r0,%r7,__PT_R0(%r11)
214 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
215 mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
216 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
217 stg %r14,__PT_FLAGS(%r11)
219 lg %r10,__TI_sysc_table(%r12) # address of system call table
220 llgh %r8,__PT_INT_CODE+2(%r11)
221 slag %r8,%r8,2 # shift and test for svc 0
223 # svc 0: system call number in %r1
224 llgfr %r1,%r1 # clear high word in r1
227 sth %r1,__PT_INT_CODE+2(%r11)
230 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
231 stg %r2,__PT_ORIG_GPR2(%r11)
232 stg %r7,STACK_FRAME_OVERHEAD(%r15)
233 lgf %r9,0(%r8,%r10) # get system call add.
234 tm __TI_flags+7(%r12),_TIF_TRACE
236 basr %r14,%r9 # call sys_xxxx
237 stg %r2,__PT_R2(%r11) # store return value
242 tm __PT_PSW+1(%r11),0x01 # returning to user ?
244 tm __PT_FLAGS+7(%r11),_PIF_WORK
246 tm __TI_flags+7(%r12),_TIF_WORK
247 jnz sysc_work # check for work
248 tm __LC_CPU_FLAGS+7,_CIF_WORK
251 lg %r14,__LC_VDSO_PER_CPU
252 lmg %r0,%r10,__PT_R0(%r11)
253 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
255 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
256 lmg %r11,%r15,__PT_R11(%r11)
257 lpswe __LC_RETURN_PSW
261 # One of the work bits is on. Find out which one.
264 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING
266 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
268 tm __PT_FLAGS+7(%r11),_PIF_PER_TRAP
270 tm __TI_flags+7(%r12),_TIF_SIGPENDING
272 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
273 jo sysc_notify_resume
274 tm __LC_CPU_FLAGS+7,_CIF_ASCE
276 j sysc_return # beware of critical section cleanup
279 # _TIF_NEED_RESCHED is set, call schedule
282 larl %r14,sysc_return
286 # _CIF_MCCK_PENDING is set, call handler
289 larl %r14,sysc_return
290 jg s390_handle_mcck # TIF bit will be cleared by handler
293 # _CIF_ASCE is set, load user space asce
296 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE
297 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
301 # _TIF_SIGPENDING is set, call do_signal
304 lgr %r2,%r11 # pass pointer to pt_regs
306 tm __PT_FLAGS+7(%r11),_PIF_SYSCALL
308 lmg %r2,%r7,__PT_R2(%r11) # load svc arguments
309 lg %r10,__TI_sysc_table(%r12) # address of system call table
310 lghi %r8,0 # svc 0 returns -ENOSYS
311 llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number
313 jnl sysc_nr_ok # invalid svc number -> do svc 0
315 j sysc_nr_ok # restart svc
318 # _TIF_NOTIFY_RESUME is set, call do_notify_resume
321 lgr %r2,%r11 # pass pointer to pt_regs
322 larl %r14,sysc_return
326 # _PIF_PER_TRAP is set, call do_per_trap
329 ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP
330 lgr %r2,%r11 # pass pointer to pt_regs
331 larl %r14,sysc_return
335 # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
336 # and after the system call
339 lgr %r2,%r11 # pass pointer to pt_regs
341 llgh %r0,__PT_INT_CODE+2(%r11)
342 stg %r0,__PT_R2(%r11)
343 brasl %r14,do_syscall_trace_enter
350 lmg %r3,%r7,__PT_R3(%r11)
351 stg %r7,STACK_FRAME_OVERHEAD(%r15)
352 lg %r2,__PT_ORIG_GPR2(%r11)
353 basr %r14,%r9 # call sys_xxx
354 stg %r2,__PT_R2(%r11) # store return value
356 tm __TI_flags+7(%r12),_TIF_TRACE
358 lgr %r2,%r11 # pass pointer to pt_regs
359 larl %r14,sysc_return
360 jg do_syscall_trace_exit
363 # a new process exits the kernel with ret_from_fork
366 la %r11,STACK_FRAME_OVERHEAD(%r15)
367 lg %r12,__LC_THREAD_INFO
368 brasl %r14,schedule_tail
370 ssm __LC_SVC_NEW_PSW # reenable interrupts
371 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
373 # it's a kernel thread
374 lmg %r9,%r10,__PT_R9(%r11) # load gprs
375 ENTRY(kernel_thread_starter)
381 * Program check handler routine
384 ENTRY(pgm_check_handler)
385 stpt __LC_SYNC_ENTER_TIMER
386 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
387 lg %r10,__LC_LAST_BREAK
388 lg %r12,__LC_THREAD_INFO
389 larl %r13,system_call
390 lmg %r8,%r9,__LC_PGM_OLD_PSW
391 HANDLE_SIE_INTERCEPT %r14,1
392 tmhh %r8,0x0001 # test problem state bit
393 jnz 1f # -> fault in user space
394 tmhh %r8,0x4000 # PER bit set in old PSW ?
395 jnz 0f # -> enabled, can't be a double fault
396 tm __LC_PGM_ILC+3,0x80 # check for per exception
397 jnz pgm_svcper # -> single stepped svc
398 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
399 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
401 1: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER
403 lg %r15,__LC_KERNEL_STACK
404 lg %r14,__TI_task(%r12)
405 lghi %r13,__LC_PGM_TDB
406 tm __LC_PGM_ILC+2,0x02 # check for transaction abort
408 mvc __THREAD_trap_tdb(256,%r14),0(%r13)
409 2: la %r11,STACK_FRAME_OVERHEAD(%r15)
410 stmg %r0,%r7,__PT_R0(%r11)
411 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
412 stmg %r8,%r9,__PT_PSW(%r11)
413 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
414 mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
415 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
416 stg %r10,__PT_ARGS(%r11)
417 tm __LC_PGM_ILC+3,0x80 # check for per exception
419 tmhh %r8,0x0001 # kernel per event ?
421 oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP
422 mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS
423 mvc __THREAD_per_cause(2,%r14),__LC_PER_CAUSE
424 mvc __THREAD_per_paid(1,%r14),__LC_PER_PAID
426 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
427 larl %r1,pgm_check_table
428 llgh %r10,__PT_INT_CODE+2(%r11)
432 lgf %r1,0(%r10,%r1) # load address of handler routine
433 lgr %r2,%r11 # pass pointer to pt_regs
434 basr %r14,%r1 # branch to interrupt-handler
438 # PER event in supervisor state, must be kprobes
442 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
443 lgr %r2,%r11 # pass pointer to pt_regs
444 brasl %r14,do_per_trap
448 # single stepped system call
451 mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
453 stg %r14,__LC_RETURN_PSW+8
454 lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP
455 lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs
458 * IO interrupt handler routine
460 ENTRY(io_int_handler)
462 stpt __LC_ASYNC_ENTER_TIMER
463 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
464 lg %r10,__LC_LAST_BREAK
465 lg %r12,__LC_THREAD_INFO
466 larl %r13,system_call
467 lmg %r8,%r9,__LC_IO_OLD_PSW
468 HANDLE_SIE_INTERCEPT %r14,2
469 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
470 tmhh %r8,0x0001 # interrupting from user?
472 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
475 stmg %r0,%r7,__PT_R0(%r11)
476 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
477 stmg %r8,%r9,__PT_PSW(%r11)
478 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
479 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
481 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
483 lgr %r2,%r11 # pass pointer to pt_regs
484 lghi %r3,IO_INTERRUPT
485 tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ?
487 lghi %r3,THIN_INTERRUPT
490 tm __LC_MACHINE_FLAGS+6,0x10 # MACHINE_FLAG_LPAR
494 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
500 tm __TI_flags+7(%r12),_TIF_WORK
501 jnz io_work # there is work to do (signals etc.)
502 tm __LC_CPU_FLAGS+7,_CIF_WORK
505 lg %r14,__LC_VDSO_PER_CPU
506 lmg %r0,%r10,__PT_R0(%r11)
507 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
509 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
510 lmg %r11,%r15,__PT_R11(%r11)
511 lpswe __LC_RETURN_PSW
515 # There is work todo, find out in which context we have been interrupted:
516 # 1) if we return to user space we can do all _TIF_WORK work
517 # 2) if we return to kernel code and kvm is enabled check if we need to
518 # modify the psw to leave SIE
519 # 3) if we return to kernel code and preemptive scheduling is enabled check
520 # the preemption counter and if it is zero call preempt_schedule_irq
521 # Before any work can be done, a switch to the kernel stack is required.
524 tm __PT_PSW+1(%r11),0x01 # returning to user ?
525 jo io_work_user # yes -> do resched & signal
526 #ifdef CONFIG_PREEMPT
527 # check for preemptive scheduling
528 icm %r0,15,__TI_precount(%r12)
529 jnz io_restore # preemption is disabled
530 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
532 # switch to kernel stack
533 lg %r1,__PT_R15(%r11)
534 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
535 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
536 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
537 la %r11,STACK_FRAME_OVERHEAD(%r1)
539 # TRACE_IRQS_ON already done at io_return, call
540 # TRACE_IRQS_OFF to keep things symmetrical
542 brasl %r14,preempt_schedule_irq
549 # Need to do work before returning to userspace, switch to kernel stack
552 lg %r1,__LC_KERNEL_STACK
553 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
554 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
555 la %r11,STACK_FRAME_OVERHEAD(%r1)
559 # One of the work bits is on. Find out which one.
562 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING
564 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
566 tm __TI_flags+7(%r12),_TIF_SIGPENDING
568 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
570 tm __LC_CPU_FLAGS+7,_CIF_ASCE
572 j io_return # beware of critical section cleanup
575 # _CIF_MCCK_PENDING is set, call handler
578 # TRACE_IRQS_ON already done at io_return
579 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler
584 # _CIF_ASCE is set, load user space asce
587 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE
588 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
592 # _TIF_NEED_RESCHED is set, call schedule
595 # TRACE_IRQS_ON already done at io_return
596 ssm __LC_SVC_NEW_PSW # reenable interrupts
597 brasl %r14,schedule # call scheduler
598 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
603 # _TIF_SIGPENDING or is set, call do_signal
606 # TRACE_IRQS_ON already done at io_return
607 ssm __LC_SVC_NEW_PSW # reenable interrupts
608 lgr %r2,%r11 # pass pointer to pt_regs
610 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
615 # _TIF_NOTIFY_RESUME or is set, call do_notify_resume
618 # TRACE_IRQS_ON already done at io_return
619 ssm __LC_SVC_NEW_PSW # reenable interrupts
620 lgr %r2,%r11 # pass pointer to pt_regs
621 brasl %r14,do_notify_resume
622 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
627 * External interrupt handler routine
629 ENTRY(ext_int_handler)
631 stpt __LC_ASYNC_ENTER_TIMER
632 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
633 lg %r10,__LC_LAST_BREAK
634 lg %r12,__LC_THREAD_INFO
635 larl %r13,system_call
636 lmg %r8,%r9,__LC_EXT_OLD_PSW
637 HANDLE_SIE_INTERCEPT %r14,3
638 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
639 tmhh %r8,0x0001 # interrupting from user ?
641 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
644 stmg %r0,%r7,__PT_R0(%r11)
645 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
646 stmg %r8,%r9,__PT_PSW(%r11)
647 lghi %r1,__LC_EXT_PARAMS2
648 mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR
649 mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS
650 mvc __PT_INT_PARM_LONG(8,%r11),0(%r1)
651 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
653 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
654 lgr %r2,%r11 # pass pointer to pt_regs
655 lghi %r3,EXT_INTERRUPT
660 * Load idle PSW. The second "half" of this function is in cleanup_idle.
663 stg %r3,__SF_EMPTY(%r15)
664 larl %r1,psw_idle_lpsw+4
665 stg %r1,__SF_EMPTY+8(%r15)
666 STCK __CLOCK_IDLE_ENTER(%r2)
667 stpt __TIMER_IDLE_ENTER(%r2)
669 lpswe __SF_EMPTY(%r15)
676 * Machine check handler routines
678 ENTRY(mcck_int_handler)
680 la %r1,4095 # revalidate r1
681 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
682 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
683 lg %r10,__LC_LAST_BREAK
684 lg %r12,__LC_THREAD_INFO
685 larl %r13,system_call
686 lmg %r8,%r9,__LC_MCK_OLD_PSW
687 HANDLE_SIE_INTERCEPT %r14,4
688 tm __LC_MCCK_CODE,0x80 # system damage?
689 jo mcck_panic # yes -> rest of mcck code invalid
690 lghi %r14,__LC_CPU_TIMER_SAVE_AREA
691 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
692 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
694 la %r14,__LC_SYNC_ENTER_TIMER
695 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
697 la %r14,__LC_ASYNC_ENTER_TIMER
698 0: clc 0(8,%r14),__LC_EXIT_TIMER
700 la %r14,__LC_EXIT_TIMER
701 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
703 la %r14,__LC_LAST_UPDATE_TIMER
705 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
706 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
707 jno mcck_panic # no -> skip cleanup critical
708 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT
709 tm %r8,0x0001 # interrupting from user ?
711 UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER
714 lghi %r14,__LC_GPREGS_SAVE_AREA+64
715 stmg %r0,%r7,__PT_R0(%r11)
716 mvc __PT_R8(64,%r11),0(%r14)
717 stmg %r8,%r9,__PT_PSW(%r11)
718 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
719 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
720 lgr %r2,%r11 # pass pointer to pt_regs
721 brasl %r14,s390_do_machine_check
722 tm __PT_PSW+1(%r11),0x01 # returning to user ?
724 lg %r1,__LC_KERNEL_STACK # switch to kernel stack
725 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
726 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
727 la %r11,STACK_FRAME_OVERHEAD(%r1)
729 ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off
730 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING
733 brasl %r14,s390_handle_mcck
736 lg %r14,__LC_VDSO_PER_CPU
737 lmg %r0,%r10,__PT_R0(%r11)
738 mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
739 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
742 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
743 0: lmg %r11,%r15,__PT_R11(%r11)
744 lpswe __LC_RETURN_MCCK_PSW
747 lg %r14,__LC_PANIC_STACK
749 srag %r14,%r14,PAGE_SHIFT
751 lg %r15,__LC_PANIC_STACK
752 0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
756 # PSW restart interrupt handler
758 ENTRY(restart_int_handler)
759 stg %r15,__LC_SAVE_AREA_RESTART
760 lg %r15,__LC_RESTART_STACK
761 aghi %r15,-__PT_SIZE # create pt_regs on stack
762 xc 0(__PT_SIZE,%r15),0(%r15)
763 stmg %r0,%r14,__PT_R0(%r15)
764 mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
765 mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw
766 aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack
767 xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
768 lg %r1,__LC_RESTART_FN # load fn, parm & source cpu
769 lg %r2,__LC_RESTART_DATA
770 lg %r3,__LC_RESTART_SOURCE
771 ltgr %r3,%r3 # test source cpu address
772 jm 1f # negative -> skip source stop
773 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu
774 brc 10,0b # wait for status stored
775 1: basr %r14,%r1 # call function
776 stap __SF_EMPTY(%r15) # store cpu address
777 llgh %r3,__SF_EMPTY(%r15)
778 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu
782 .section .kprobes.text, "ax"
784 #ifdef CONFIG_CHECK_STACK
786 * The synchronous or the asynchronous stack overflowed. We are dead.
787 * No need to properly save the registers, we are going to panic anyway.
788 * Setup a pt_regs so that show_trace can provide a good call trace.
791 lg %r15,__LC_PANIC_STACK # change to panic stack
792 la %r11,STACK_FRAME_OVERHEAD(%r15)
793 stmg %r0,%r7,__PT_R0(%r11)
794 stmg %r8,%r9,__PT_PSW(%r11)
795 mvc __PT_R8(64,%r11),0(%r14)
796 stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2
797 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
798 lgr %r2,%r11 # pass pointer to pt_regs
799 jg kernel_stack_overflow
816 clg %r9,BASED(cleanup_table) # system_call
818 clg %r9,BASED(cleanup_table+8) # sysc_do_svc
819 jl cleanup_system_call
820 clg %r9,BASED(cleanup_table+16) # sysc_tif
822 clg %r9,BASED(cleanup_table+24) # sysc_restore
824 clg %r9,BASED(cleanup_table+32) # sysc_done
825 jl cleanup_sysc_restore
826 clg %r9,BASED(cleanup_table+40) # io_tif
828 clg %r9,BASED(cleanup_table+48) # io_restore
830 clg %r9,BASED(cleanup_table+56) # io_done
831 jl cleanup_io_restore
832 clg %r9,BASED(cleanup_table+64) # psw_idle
834 clg %r9,BASED(cleanup_table+72) # psw_idle_end
840 # check if stpt has been executed
841 clg %r9,BASED(cleanup_system_call_insn)
843 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
844 cghi %r11,__LC_SAVE_AREA_ASYNC
846 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
847 0: # check if stmg has been executed
848 clg %r9,BASED(cleanup_system_call_insn+8)
850 mvc __LC_SAVE_AREA_SYNC(64),0(%r11)
851 0: # check if base register setup + TIF bit load has been done
852 clg %r9,BASED(cleanup_system_call_insn+16)
854 # set up saved registers r10 and r12
855 stg %r10,16(%r11) # r10 last break
856 stg %r12,32(%r11) # r12 thread-info pointer
857 0: # check if the user time update has been done
858 clg %r9,BASED(cleanup_system_call_insn+24)
860 lg %r15,__LC_EXIT_TIMER
861 slg %r15,__LC_SYNC_ENTER_TIMER
862 alg %r15,__LC_USER_TIMER
863 stg %r15,__LC_USER_TIMER
864 0: # check if the system time update has been done
865 clg %r9,BASED(cleanup_system_call_insn+32)
867 lg %r15,__LC_LAST_UPDATE_TIMER
868 slg %r15,__LC_EXIT_TIMER
869 alg %r15,__LC_SYSTEM_TIMER
870 stg %r15,__LC_SYSTEM_TIMER
871 0: # update accounting time stamp
872 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
877 mvc __TI_last_break(8,%r12),16(%r11)
878 0: # set up saved register r11
879 lg %r15,__LC_KERNEL_STACK
880 la %r9,STACK_FRAME_OVERHEAD(%r15)
881 stg %r9,24(%r11) # r11 pt_regs pointer
883 mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC
884 stmg %r0,%r7,__PT_R0(%r9)
885 mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW
886 mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC
887 xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9)
888 mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL
889 # setup saved register r15
890 stg %r15,56(%r11) # r15 stack pointer
891 # set new psw address and exit
894 cleanup_system_call_insn:
905 cleanup_sysc_restore:
906 clg %r9,BASED(cleanup_sysc_restore_insn)
908 lg %r9,24(%r11) # get saved pointer to pt_regs
909 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
910 mvc 0(64,%r11),__PT_R8(%r9)
911 lmg %r0,%r7,__PT_R0(%r9)
912 0: lmg %r8,%r9,__LC_RETURN_PSW
914 cleanup_sysc_restore_insn:
922 clg %r9,BASED(cleanup_io_restore_insn)
924 lg %r9,24(%r11) # get saved r11 pointer to pt_regs
925 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
926 mvc 0(64,%r11),__PT_R8(%r9)
927 lmg %r0,%r7,__PT_R0(%r9)
928 0: lmg %r8,%r9,__LC_RETURN_PSW
930 cleanup_io_restore_insn:
934 # copy interrupt clock & cpu timer
935 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK
936 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER
937 cghi %r11,__LC_SAVE_AREA_ASYNC
939 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
940 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER
941 0: # check if stck & stpt have been executed
942 clg %r9,BASED(cleanup_idle_insn)
944 mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
945 mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
946 1: # account system time going idle
947 lg %r9,__LC_STEAL_TIMER
948 alg %r9,__CLOCK_IDLE_ENTER(%r2)
949 slg %r9,__LC_LAST_UPDATE_CLOCK
950 stg %r9,__LC_STEAL_TIMER
951 mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
952 lg %r9,__LC_SYSTEM_TIMER
953 alg %r9,__LC_LAST_UPDATE_TIMER
954 slg %r9,__TIMER_IDLE_ENTER(%r2)
955 stg %r9,__LC_SYSTEM_TIMER
956 mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
958 nihh %r8,0xfcfd # clear irq & wait state bits
959 lg %r9,48(%r11) # return from psw_idle
969 .quad __critical_start
971 .quad __critical_end - __critical_start
974 #if IS_ENABLED(CONFIG_KVM)
976 * sie64a calling convention:
977 * %r2 pointer to sie control block
978 * %r3 guest register save area
981 stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers
982 stg %r2,__SF_EMPTY(%r15) # save control block pointer
983 stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
984 xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason
985 lmg %r0,%r13,0(%r3) # load guest gprs 0-13
986 lg %r14,__LC_GMAP # get gmap pointer
989 lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce
991 lg %r14,__SF_EMPTY(%r15) # get control block pointer
992 oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now
993 tm __SIE_PROG20+3(%r14),1 # last exit...
995 LPP __SF_EMPTY(%r15) # set guest id
998 LPP __SF_EMPTY+16(%r15) # set host id
999 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
1000 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
1001 # some program checks are suppressing. C code (e.g. do_protection_exception)
1002 # will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other
1003 # instructions between sie64a and sie_done should not cause program
1004 # interrupts. So lets use a nop (47 00 00 00) as a landing pad.
1005 # See also HANDLE_SIE_INTERCEPT
1010 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
1011 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
1012 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
1013 lg %r2,__SF_EMPTY+24(%r15) # return exit reason code
1017 stg %r14,__SF_EMPTY+24(%r15) # set exit reason code
1023 .Lsie_critical_length:
1024 .quad sie_done - sie_gmap
1026 EX_TABLE(rewind_pad,sie_fault)
1027 EX_TABLE(sie_exit,sie_fault)
1030 .section .rodata, "a"
1031 #define SYSCALL(esa,esame,emu) .long esame
1032 .globl sys_call_table
1034 #include "syscalls.S"
1037 #ifdef CONFIG_COMPAT
1039 #define SYSCALL(esa,esame,emu) .long emu
1040 .globl sys_call_table_emu
1042 #include "syscalls.S"