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_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
46 _TIF_MCCK_PENDING | _TIF_PER_TRAP | _TIF_ASCE)
47 _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
48 _TIF_MCCK_PENDING | _TIF_ASCE)
49 _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
50 _TIF_SYSCALL_TRACEPOINT)
51 _TIF_TRANSFER = (_TIF_MCCK_PENDING | _TIF_TLB_WAIT)
53 #define BASED(name) name-system_call(%r13)
56 #ifdef CONFIG_TRACE_IRQFLAGS
58 brasl %r14,trace_hardirqs_on_caller
63 #ifdef CONFIG_TRACE_IRQFLAGS
65 brasl %r14,trace_hardirqs_off_caller
69 .macro LOCKDEP_SYS_EXIT
71 tm __PT_PSW+1(%r11),0x01 # returning to user ?
73 brasl %r14,lockdep_sys_exit
78 #if IS_ENABLED(CONFIG_KVM)
79 tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_LPP
81 .insn s,0xb2800000,\newpp
85 .macro HANDLE_SIE_INTERCEPT scratch,reason
86 #if IS_ENABLED(CONFIG_KVM)
87 tmhh %r8,0x0001 # interrupting from user ?
90 slg \scratch,BASED(.Lsie_critical)
91 clg \scratch,BASED(.Lsie_critical_length)
93 # Some program interrupts are suppressing (e.g. protection).
94 # We must also check the instruction after SIE in that case.
95 # do_protection_exception will rewind to rewind_pad
100 lg %r14,__SF_EMPTY(%r15) # get control block pointer
101 LPP __SF_EMPTY+16(%r15) # set host id
102 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
103 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
104 larl %r9,sie_exit # skip forward to sie_exit
105 mvi __SF_EMPTY+31(%r15),\reason # set exit reason
109 .macro CHECK_STACK stacksize,savearea
110 #ifdef CONFIG_CHECK_STACK
111 tml %r15,\stacksize - CONFIG_STACK_GUARD
117 .macro SWITCH_ASYNC savearea,stack,shift
118 tmhh %r8,0x0001 # interrupting from user ?
121 slg %r14,BASED(.Lcritical_start)
122 clg %r14,BASED(.Lcritical_length)
124 lghi %r11,\savearea # inside critical section, do cleanup
125 brasl %r14,cleanup_critical
126 tmhh %r8,0x0001 # retest problem state after cleanup
128 0: lg %r14,\stack # are we already on the target stack?
130 srag %r14,%r14,\shift
132 CHECK_STACK 1<<\shift,\savearea
133 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
135 1: lg %r15,\stack # load target stack
136 2: la %r11,STACK_FRAME_OVERHEAD(%r15)
139 .macro UPDATE_VTIME scratch,enter_timer
140 lg \scratch,__LC_EXIT_TIMER
141 slg \scratch,\enter_timer
142 alg \scratch,__LC_USER_TIMER
143 stg \scratch,__LC_USER_TIMER
144 lg \scratch,__LC_LAST_UPDATE_TIMER
145 slg \scratch,__LC_EXIT_TIMER
146 alg \scratch,__LC_SYSTEM_TIMER
147 stg \scratch,__LC_SYSTEM_TIMER
148 mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer
151 .macro LAST_BREAK scratch
152 srag \scratch,%r10,23
154 stg %r10,__TI_last_break(%r12)
158 stg %r8,__LC_RETURN_PSW
159 ni __LC_RETURN_PSW,0xbf
164 #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
165 .insn s,0xb27c0000,\savearea # store clock fast
167 .insn s,0xb2050000,\savearea # store clock
171 .section .kprobes.text, "ax"
174 * Scheduler resume function, called by switch_to
175 * gpr2 = (task_struct *) prev
176 * gpr3 = (task_struct *) next
181 stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
182 stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev
183 lg %r4,__THREAD_info(%r2) # get thread_info of prev
184 lg %r5,__THREAD_info(%r3) # get thread_info of next
186 aghi %r15,STACK_INIT # end of kernel stack of next
187 stg %r3,__LC_CURRENT # store task struct of next
188 stg %r5,__LC_THREAD_INFO # store thread info of next
189 stg %r15,__LC_KERNEL_STACK # store end of kernel stack
190 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
191 mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
192 lg %r15,__THREAD_ksp(%r3) # load kernel stack of next
193 llill %r6,_TIF_TRANSFER # transfer TIF bits
194 ng %r6,__TI_flags(%r4) # isolate TIF bits
196 og %r6,__TI_flags(%r5) # set TIF bits of next
197 stg %r6,__TI_flags(%r5)
198 ni __TI_flags+7(%r4),255-_TIF_TRANSFER # clear TIF bits of prev
199 0: lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
204 * SVC interrupt handler routine. System calls are synchronous events and
205 * are executed with interrupts enabled.
209 stpt __LC_SYNC_ENTER_TIMER
211 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
212 lg %r10,__LC_LAST_BREAK
213 lg %r12,__LC_THREAD_INFO
215 lg %r15,__LC_KERNEL_STACK
216 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
218 UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER
220 stmg %r0,%r7,__PT_R0(%r11)
221 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
222 mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
223 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
225 oi __TI_flags+7(%r12),_TIF_SYSCALL
226 lg %r10,__TI_sysc_table(%r12) # address of system call table
227 llgh %r8,__PT_INT_CODE+2(%r11)
228 slag %r8,%r8,2 # shift and test for svc 0
230 # svc 0: system call number in %r1
231 llgfr %r1,%r1 # clear high word in r1
234 sth %r1,__PT_INT_CODE+2(%r11)
237 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
238 stg %r2,__PT_ORIG_GPR2(%r11)
239 stg %r7,STACK_FRAME_OVERHEAD(%r15)
240 lgf %r9,0(%r8,%r10) # get system call add.
241 tm __TI_flags+6(%r12),_TIF_TRACE >> 8
243 basr %r14,%r9 # call sys_xxxx
244 stg %r2,__PT_R2(%r11) # store return value
249 tm __PT_PSW+1(%r11),0x01 # returning to user ?
251 tm __TI_flags+7(%r12),_TIF_WORK_SVC
252 jnz sysc_work # check for work
253 ni __TI_flags+7(%r12),255-_TIF_SYSCALL
255 lg %r14,__LC_VDSO_PER_CPU
256 lmg %r0,%r10,__PT_R0(%r11)
257 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
259 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
260 lmg %r11,%r15,__PT_R11(%r11)
261 lpswe __LC_RETURN_PSW
265 # One of the work bits is on. Find out which one.
268 tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
270 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
272 tm __TI_flags+7(%r12),_TIF_PER_TRAP
274 tm __TI_flags+7(%r12),_TIF_SIGPENDING
276 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
277 jo sysc_notify_resume
278 tm __TI_flags+7(%r12),_TIF_ASCE
280 j sysc_return # beware of critical section cleanup
283 # _TIF_NEED_RESCHED is set, call schedule
286 larl %r14,sysc_return
290 # _TIF_MCCK_PENDING is set, call handler
293 larl %r14,sysc_return
294 jg s390_handle_mcck # TIF bit will be cleared by handler
297 # _TIF_ASCE is set, load user space asce
300 ni __TI_flags+7(%r12),255-_TIF_ASCE
301 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
305 # _TIF_SIGPENDING is set, call do_signal
308 lgr %r2,%r11 # pass pointer to pt_regs
310 tm __TI_flags+7(%r12),_TIF_SYSCALL
312 lmg %r2,%r7,__PT_R2(%r11) # load svc arguments
313 lg %r10,__TI_sysc_table(%r12) # address of system call table
314 lghi %r8,0 # svc 0 returns -ENOSYS
315 llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number
317 jnl sysc_nr_ok # invalid svc number -> do svc 0
319 j sysc_nr_ok # restart svc
322 # _TIF_NOTIFY_RESUME is set, call do_notify_resume
325 lgr %r2,%r11 # pass pointer to pt_regs
326 larl %r14,sysc_return
330 # _TIF_PER_TRAP is set, call do_per_trap
333 ni __TI_flags+7(%r12),255-_TIF_PER_TRAP
334 lgr %r2,%r11 # pass pointer to pt_regs
335 larl %r14,sysc_return
339 # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
340 # and after the system call
343 lgr %r2,%r11 # pass pointer to pt_regs
345 llgh %r0,__PT_INT_CODE+2(%r11)
346 stg %r0,__PT_R2(%r11)
347 brasl %r14,do_syscall_trace_enter
354 lmg %r3,%r7,__PT_R3(%r11)
355 stg %r7,STACK_FRAME_OVERHEAD(%r15)
356 lg %r2,__PT_ORIG_GPR2(%r11)
357 basr %r14,%r9 # call sys_xxx
358 stg %r2,__PT_R2(%r11) # store return value
360 tm __TI_flags+6(%r12),_TIF_TRACE >> 8
362 lgr %r2,%r11 # pass pointer to pt_regs
363 larl %r14,sysc_return
364 jg do_syscall_trace_exit
367 # a new process exits the kernel with ret_from_fork
370 la %r11,STACK_FRAME_OVERHEAD(%r15)
371 lg %r12,__LC_THREAD_INFO
372 brasl %r14,schedule_tail
374 ssm __LC_SVC_NEW_PSW # reenable interrupts
375 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
377 # it's a kernel thread
378 lmg %r9,%r10,__PT_R9(%r11) # load gprs
379 ENTRY(kernel_thread_starter)
385 * Program check handler routine
388 ENTRY(pgm_check_handler)
389 stpt __LC_SYNC_ENTER_TIMER
390 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
391 lg %r10,__LC_LAST_BREAK
392 lg %r12,__LC_THREAD_INFO
393 larl %r13,system_call
394 lmg %r8,%r9,__LC_PGM_OLD_PSW
395 HANDLE_SIE_INTERCEPT %r14,1
396 tmhh %r8,0x0001 # test problem state bit
397 jnz 1f # -> fault in user space
398 tmhh %r8,0x4000 # PER bit set in old PSW ?
399 jnz 0f # -> enabled, can't be a double fault
400 tm __LC_PGM_ILC+3,0x80 # check for per exception
401 jnz pgm_svcper # -> single stepped svc
402 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
403 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
405 1: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER
407 lg %r15,__LC_KERNEL_STACK
408 lg %r14,__TI_task(%r12)
409 lghi %r13,__LC_PGM_TDB
410 tm __LC_PGM_ILC+2,0x02 # check for transaction abort
412 mvc __THREAD_trap_tdb(256,%r14),0(%r13)
413 2: la %r11,STACK_FRAME_OVERHEAD(%r15)
414 stmg %r0,%r7,__PT_R0(%r11)
415 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
416 stmg %r8,%r9,__PT_PSW(%r11)
417 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
418 mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
419 stg %r10,__PT_ARGS(%r11)
420 tm __LC_PGM_ILC+3,0x80 # check for per exception
422 tmhh %r8,0x0001 # kernel per event ?
424 oi __TI_flags+7(%r12),_TIF_PER_TRAP
425 mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS
426 mvc __THREAD_per_cause(2,%r14),__LC_PER_CAUSE
427 mvc __THREAD_per_paid(1,%r14),__LC_PER_PAID
429 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
430 larl %r1,pgm_check_table
431 llgh %r10,__PT_INT_CODE+2(%r11)
435 lgf %r1,0(%r10,%r1) # load address of handler routine
436 lgr %r2,%r11 # pass pointer to pt_regs
437 basr %r14,%r1 # branch to interrupt-handler
441 # PER event in supervisor state, must be kprobes
445 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
446 lgr %r2,%r11 # pass pointer to pt_regs
447 brasl %r14,do_per_trap
451 # single stepped system call
454 oi __TI_flags+7(%r12),_TIF_PER_TRAP
455 mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
457 stg %r14,__LC_RETURN_PSW+8
458 lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs
461 * IO interrupt handler routine
463 ENTRY(io_int_handler)
465 stpt __LC_ASYNC_ENTER_TIMER
466 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
467 lg %r10,__LC_LAST_BREAK
468 lg %r12,__LC_THREAD_INFO
469 larl %r13,system_call
470 lmg %r8,%r9,__LC_IO_OLD_PSW
471 HANDLE_SIE_INTERCEPT %r14,2
472 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
473 tmhh %r8,0x0001 # interrupting from user?
475 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
478 stmg %r0,%r7,__PT_R0(%r11)
479 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
480 stmg %r8,%r9,__PT_PSW(%r11)
481 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
483 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
485 lgr %r2,%r11 # pass pointer to pt_regs
486 lghi %r3,IO_INTERRUPT
487 tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ?
489 lghi %r3,THIN_INTERRUPT
492 tm __LC_MACHINE_FLAGS+6,0x10 # MACHINE_FLAG_LPAR
496 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
502 tm __TI_flags+7(%r12),_TIF_WORK_INT
503 jnz io_work # there is work to do (signals etc.)
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_INT 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.
560 # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED
561 # and _TIF_MCCK_PENDING
564 tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
566 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
568 tm __TI_flags+7(%r12),_TIF_SIGPENDING
570 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
572 tm __TI_flags+7(%r12),_TIF_ASCE
574 j io_return # beware of critical section cleanup
577 # _TIF_MCCK_PENDING is set, call handler
580 # TRACE_IRQS_ON already done at io_return
581 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler
586 # _TIF_ASCE is set, load user space asce
589 ni __TI_flags+7(%r12),255-_TIF_ASCE
590 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
594 # _TIF_NEED_RESCHED is set, call schedule
597 # TRACE_IRQS_ON already done at io_return
598 ssm __LC_SVC_NEW_PSW # reenable interrupts
599 brasl %r14,schedule # call scheduler
600 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
605 # _TIF_SIGPENDING or is set, call do_signal
608 # TRACE_IRQS_ON already done at io_return
609 ssm __LC_SVC_NEW_PSW # reenable interrupts
610 lgr %r2,%r11 # pass pointer to pt_regs
612 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
617 # _TIF_NOTIFY_RESUME or is set, call do_notify_resume
620 # TRACE_IRQS_ON already done at io_return
621 ssm __LC_SVC_NEW_PSW # reenable interrupts
622 lgr %r2,%r11 # pass pointer to pt_regs
623 brasl %r14,do_notify_resume
624 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
629 * External interrupt handler routine
631 ENTRY(ext_int_handler)
633 stpt __LC_ASYNC_ENTER_TIMER
634 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
635 lg %r10,__LC_LAST_BREAK
636 lg %r12,__LC_THREAD_INFO
637 larl %r13,system_call
638 lmg %r8,%r9,__LC_EXT_OLD_PSW
639 HANDLE_SIE_INTERCEPT %r14,3
640 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
641 tmhh %r8,0x0001 # interrupting from user ?
643 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
646 stmg %r0,%r7,__PT_R0(%r11)
647 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
648 stmg %r8,%r9,__PT_PSW(%r11)
649 lghi %r1,__LC_EXT_PARAMS2
650 mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR
651 mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS
652 mvc __PT_INT_PARM_LONG(8,%r11),0(%r1)
654 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
655 lgr %r2,%r11 # pass pointer to pt_regs
656 lghi %r3,EXT_INTERRUPT
661 * Load idle PSW. The second "half" of this function is in cleanup_idle.
664 stg %r3,__SF_EMPTY(%r15)
665 larl %r1,psw_idle_lpsw+4
666 stg %r1,__SF_EMPTY+8(%r15)
667 STCK __CLOCK_IDLE_ENTER(%r2)
668 stpt __TIMER_IDLE_ENTER(%r2)
670 lpswe __SF_EMPTY(%r15)
677 * Machine check handler routines
679 ENTRY(mcck_int_handler)
681 la %r1,4095 # revalidate r1
682 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
683 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
684 lg %r10,__LC_LAST_BREAK
685 lg %r12,__LC_THREAD_INFO
686 larl %r13,system_call
687 lmg %r8,%r9,__LC_MCK_OLD_PSW
688 HANDLE_SIE_INTERCEPT %r14,4
689 tm __LC_MCCK_CODE,0x80 # system damage?
690 jo mcck_panic # yes -> rest of mcck code invalid
691 lghi %r14,__LC_CPU_TIMER_SAVE_AREA
692 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
693 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
695 la %r14,__LC_SYNC_ENTER_TIMER
696 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
698 la %r14,__LC_ASYNC_ENTER_TIMER
699 0: clc 0(8,%r14),__LC_EXIT_TIMER
701 la %r14,__LC_EXIT_TIMER
702 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
704 la %r14,__LC_LAST_UPDATE_TIMER
706 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
707 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
708 jno mcck_panic # no -> skip cleanup critical
709 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT
710 tm %r8,0x0001 # interrupting from user ?
712 UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER
715 lghi %r14,__LC_GPREGS_SAVE_AREA+64
716 stmg %r0,%r7,__PT_R0(%r11)
717 mvc __PT_R8(64,%r11),0(%r14)
718 stmg %r8,%r9,__PT_PSW(%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 __TI_flags+7(%r12),_TIF_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 # setup saved register r15
888 stg %r15,56(%r11) # r15 stack pointer
889 # set new psw address and exit
892 cleanup_system_call_insn:
903 cleanup_sysc_restore:
904 clg %r9,BASED(cleanup_sysc_restore_insn)
906 lg %r9,24(%r11) # get saved pointer to pt_regs
907 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
908 mvc 0(64,%r11),__PT_R8(%r9)
909 lmg %r0,%r7,__PT_R0(%r9)
910 0: lmg %r8,%r9,__LC_RETURN_PSW
912 cleanup_sysc_restore_insn:
920 clg %r9,BASED(cleanup_io_restore_insn)
922 lg %r9,24(%r11) # get saved r11 pointer to pt_regs
923 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
924 mvc 0(64,%r11),__PT_R8(%r9)
925 lmg %r0,%r7,__PT_R0(%r9)
926 0: lmg %r8,%r9,__LC_RETURN_PSW
928 cleanup_io_restore_insn:
932 # copy interrupt clock & cpu timer
933 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK
934 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER
935 cghi %r11,__LC_SAVE_AREA_ASYNC
937 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
938 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER
939 0: # check if stck & stpt have been executed
940 clg %r9,BASED(cleanup_idle_insn)
942 mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
943 mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
944 1: # account system time going idle
945 lg %r9,__LC_STEAL_TIMER
946 alg %r9,__CLOCK_IDLE_ENTER(%r2)
947 slg %r9,__LC_LAST_UPDATE_CLOCK
948 stg %r9,__LC_STEAL_TIMER
949 mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
950 lg %r9,__LC_SYSTEM_TIMER
951 alg %r9,__LC_LAST_UPDATE_TIMER
952 slg %r9,__TIMER_IDLE_ENTER(%r2)
953 stg %r9,__LC_SYSTEM_TIMER
954 mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
956 nihh %r8,0xfcfd # clear irq & wait state bits
957 lg %r9,48(%r11) # return from psw_idle
967 .quad __critical_start
969 .quad __critical_end - __critical_start
972 #if IS_ENABLED(CONFIG_KVM)
974 * sie64a calling convention:
975 * %r2 pointer to sie control block
976 * %r3 guest register save area
979 stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers
980 stg %r2,__SF_EMPTY(%r15) # save control block pointer
981 stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
982 xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason
983 lmg %r0,%r13,0(%r3) # load guest gprs 0-13
984 lg %r14,__LC_GMAP # get gmap pointer
987 lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce
989 lg %r14,__SF_EMPTY(%r15) # get control block pointer
990 oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now
991 tm __SIE_PROG20+3(%r14),1 # last exit...
993 LPP __SF_EMPTY(%r15) # set guest id
996 LPP __SF_EMPTY+16(%r15) # set host id
997 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
998 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
999 # some program checks are suppressing. C code (e.g. do_protection_exception)
1000 # will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other
1001 # instructions between sie64a and sie_done should not cause program
1002 # interrupts. So lets use a nop (47 00 00 00) as a landing pad.
1003 # See also HANDLE_SIE_INTERCEPT
1008 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
1009 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
1010 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
1011 lg %r2,__SF_EMPTY+24(%r15) # return exit reason code
1015 stg %r14,__SF_EMPTY+24(%r15) # set exit reason code
1021 .Lsie_critical_length:
1022 .quad sie_done - sie_gmap
1024 EX_TABLE(rewind_pad,sie_fault)
1025 EX_TABLE(sie_exit,sie_fault)
1028 .section .rodata, "a"
1029 #define SYSCALL(esa,esame,emu) .long esame
1030 .globl sys_call_table
1032 #include "syscalls.S"
1035 #ifdef CONFIG_COMPAT
1037 #define SYSCALL(esa,esame,emu) .long emu
1038 .globl sys_call_table_emu
1040 #include "syscalls.S"