xref: /openbmc/linux/arch/s390/kernel/entry.S (revision b830f94f) 
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 *    S390 low-level entry points.
4 *
5 *    Copyright 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>
10 */
11
12#include <linux/init.h>
13#include <linux/linkage.h>
14#include <asm/alternative-asm.h>
15#include <asm/processor.h>
16#include <asm/cache.h>
17#include <asm/ctl_reg.h>
18#include <asm/dwarf.h>
19#include <asm/errno.h>
20#include <asm/ptrace.h>
21#include <asm/thread_info.h>
22#include <asm/asm-offsets.h>
23#include <asm/unistd.h>
24#include <asm/page.h>
25#include <asm/sigp.h>
26#include <asm/irq.h>
27#include <asm/vx-insn.h>
28#include <asm/setup.h>
29#include <asm/nmi.h>
30#include <asm/export.h>
31#include <asm/nospec-insn.h>
32
33__PT_R0      =	__PT_GPRS
34__PT_R1      =	__PT_GPRS + 8
35__PT_R2      =	__PT_GPRS + 16
36__PT_R3      =	__PT_GPRS + 24
37__PT_R4      =	__PT_GPRS + 32
38__PT_R5      =	__PT_GPRS + 40
39__PT_R6      =	__PT_GPRS + 48
40__PT_R7      =	__PT_GPRS + 56
41__PT_R8      =	__PT_GPRS + 64
42__PT_R9      =	__PT_GPRS + 72
43__PT_R10     =	__PT_GPRS + 80
44__PT_R11     =	__PT_GPRS + 88
45__PT_R12     =	__PT_GPRS + 96
46__PT_R13     =	__PT_GPRS + 104
47__PT_R14     =	__PT_GPRS + 112
48__PT_R15     =	__PT_GPRS + 120
49
50STACK_SHIFT = PAGE_SHIFT + THREAD_SIZE_ORDER
51STACK_SIZE  = 1 << STACK_SHIFT
52STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
53
54_TIF_WORK	= (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
55		   _TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING)
56_TIF_TRACE	= (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
57		   _TIF_SYSCALL_TRACEPOINT)
58_CIF_WORK	= (_CIF_MCCK_PENDING | _CIF_ASCE_PRIMARY | \
59		   _CIF_ASCE_SECONDARY | _CIF_FPU)
60_PIF_WORK	= (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART)
61
62_LPP_OFFSET	= __LC_LPP
63
64#define BASED(name) name-cleanup_critical(%r13)
65
66	.macro	TRACE_IRQS_ON
67#ifdef CONFIG_TRACE_IRQFLAGS
68	basr	%r2,%r0
69	brasl	%r14,trace_hardirqs_on_caller
70#endif
71	.endm
72
73	.macro	TRACE_IRQS_OFF
74#ifdef CONFIG_TRACE_IRQFLAGS
75	basr	%r2,%r0
76	brasl	%r14,trace_hardirqs_off_caller
77#endif
78	.endm
79
80	.macro	LOCKDEP_SYS_EXIT
81#ifdef CONFIG_LOCKDEP
82	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
83	jz	.+10
84	brasl	%r14,lockdep_sys_exit
85#endif
86	.endm
87
88	.macro	CHECK_STACK savearea
89#ifdef CONFIG_CHECK_STACK
90	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
91	lghi	%r14,\savearea
92	jz	stack_overflow
93#endif
94	.endm
95
96	.macro	CHECK_VMAP_STACK savearea,oklabel
97#ifdef CONFIG_VMAP_STACK
98	lgr	%r14,%r15
99	nill	%r14,0x10000 - STACK_SIZE
100	oill	%r14,STACK_INIT
101	clg	%r14,__LC_KERNEL_STACK
102	je	\oklabel
103	clg	%r14,__LC_ASYNC_STACK
104	je	\oklabel
105	clg	%r14,__LC_NODAT_STACK
106	je	\oklabel
107	clg	%r14,__LC_RESTART_STACK
108	je	\oklabel
109	lghi	%r14,\savearea
110	j	stack_overflow
111#else
112	j	\oklabel
113#endif
114	.endm
115
116	.macro	SWITCH_ASYNC savearea,timer
117	tmhh	%r8,0x0001		# interrupting from user ?
118	jnz	1f
119	lgr	%r14,%r9
120	slg	%r14,BASED(.Lcritical_start)
121	clg	%r14,BASED(.Lcritical_length)
122	jhe	0f
123	lghi	%r11,\savearea		# inside critical section, do cleanup
124	brasl	%r14,cleanup_critical
125	tmhh	%r8,0x0001		# retest problem state after cleanup
126	jnz	1f
1270:	lg	%r14,__LC_ASYNC_STACK	# are we already on the target stack?
128	slgr	%r14,%r15
129	srag	%r14,%r14,STACK_SHIFT
130	jnz	2f
131	CHECK_STACK \savearea
132	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
133	j	3f
1341:	UPDATE_VTIME %r14,%r15,\timer
135	BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
1362:	lg	%r15,__LC_ASYNC_STACK	# load async stack
1373:	la	%r11,STACK_FRAME_OVERHEAD(%r15)
138	.endm
139
140	.macro UPDATE_VTIME w1,w2,enter_timer
141	lg	\w1,__LC_EXIT_TIMER
142	lg	\w2,__LC_LAST_UPDATE_TIMER
143	slg	\w1,\enter_timer
144	slg	\w2,__LC_EXIT_TIMER
145	alg	\w1,__LC_USER_TIMER
146	alg	\w2,__LC_SYSTEM_TIMER
147	stg	\w1,__LC_USER_TIMER
148	stg	\w2,__LC_SYSTEM_TIMER
149	mvc	__LC_LAST_UPDATE_TIMER(8),\enter_timer
150	.endm
151
152	.macro REENABLE_IRQS
153	stg	%r8,__LC_RETURN_PSW
154	ni	__LC_RETURN_PSW,0xbf
155	ssm	__LC_RETURN_PSW
156	.endm
157
158	.macro STCK savearea
159#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
160	.insn	s,0xb27c0000,\savearea		# store clock fast
161#else
162	.insn	s,0xb2050000,\savearea		# store clock
163#endif
164	.endm
165
166	/*
167	 * The TSTMSK macro generates a test-under-mask instruction by
168	 * calculating the memory offset for the specified mask value.
169	 * Mask value can be any constant.  The macro shifts the mask
170	 * value to calculate the memory offset for the test-under-mask
171	 * instruction.
172	 */
173	.macro TSTMSK addr, mask, size=8, bytepos=0
174		.if (\bytepos < \size) && (\mask >> 8)
175			.if (\mask & 0xff)
176				.error "Mask exceeds byte boundary"
177			.endif
178			TSTMSK \addr, "(\mask >> 8)", \size, "(\bytepos + 1)"
179			.exitm
180		.endif
181		.ifeq \mask
182			.error "Mask must not be zero"
183		.endif
184		off = \size - \bytepos - 1
185		tm	off+\addr, \mask
186	.endm
187
188	.macro BPOFF
189	ALTERNATIVE "", ".long 0xb2e8c000", 82
190	.endm
191
192	.macro BPON
193	ALTERNATIVE "", ".long 0xb2e8d000", 82
194	.endm
195
196	.macro BPENTER tif_ptr,tif_mask
197	ALTERNATIVE "TSTMSK \tif_ptr,\tif_mask; jz .+8; .long 0xb2e8d000", \
198		    "", 82
199	.endm
200
201	.macro BPEXIT tif_ptr,tif_mask
202	TSTMSK	\tif_ptr,\tif_mask
203	ALTERNATIVE "jz .+8;  .long 0xb2e8c000", \
204		    "jnz .+8; .long 0xb2e8d000", 82
205	.endm
206
207	GEN_BR_THUNK %r9
208	GEN_BR_THUNK %r14
209	GEN_BR_THUNK %r14,%r11
210
211	.section .kprobes.text, "ax"
212.Ldummy:
213	/*
214	 * This nop exists only in order to avoid that __switch_to starts at
215	 * the beginning of the kprobes text section. In that case we would
216	 * have several symbols at the same address. E.g. objdump would take
217	 * an arbitrary symbol name when disassembling this code.
218	 * With the added nop in between the __switch_to symbol is unique
219	 * again.
220	 */
221	nop	0
222
223ENTRY(__bpon)
224	.globl __bpon
225	BPON
226	BR_EX	%r14
227ENDPROC(__bpon)
228
229/*
230 * Scheduler resume function, called by switch_to
231 *  gpr2 = (task_struct *) prev
232 *  gpr3 = (task_struct *) next
233 * Returns:
234 *  gpr2 = prev
235 */
236ENTRY(__switch_to)
237	stmg	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
238	lghi	%r4,__TASK_stack
239	lghi	%r1,__TASK_thread
240	llill	%r5,STACK_INIT
241	stg	%r15,__THREAD_ksp(%r1,%r2)	# store kernel stack of prev
242	lg	%r15,0(%r4,%r3)			# start of kernel stack of next
243	agr	%r15,%r5			# end of kernel stack of next
244	stg	%r3,__LC_CURRENT		# store task struct of next
245	stg	%r15,__LC_KERNEL_STACK		# store end of kernel stack
246	lg	%r15,__THREAD_ksp(%r1,%r3)	# load kernel stack of next
247	aghi	%r3,__TASK_pid
248	mvc	__LC_CURRENT_PID(4,%r0),0(%r3)	# store pid of next
249	lmg	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
250	ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40
251	BR_EX	%r14
252ENDPROC(__switch_to)
253
254.L__critical_start:
255
256#if IS_ENABLED(CONFIG_KVM)
257/*
258 * sie64a calling convention:
259 * %r2 pointer to sie control block
260 * %r3 guest register save area
261 */
262ENTRY(sie64a)
263	stmg	%r6,%r14,__SF_GPRS(%r15)	# save kernel registers
264	lg	%r12,__LC_CURRENT
265	stg	%r2,__SF_SIE_CONTROL(%r15)	# save control block pointer
266	stg	%r3,__SF_SIE_SAVEAREA(%r15)	# save guest register save area
267	xc	__SF_SIE_REASON(8,%r15),__SF_SIE_REASON(%r15) # reason code = 0
268	mvc	__SF_SIE_FLAGS(8,%r15),__TI_flags(%r12) # copy thread flags
269	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU		# load guest fp/vx registers ?
270	jno	.Lsie_load_guest_gprs
271	brasl	%r14,load_fpu_regs		# load guest fp/vx regs
272.Lsie_load_guest_gprs:
273	lmg	%r0,%r13,0(%r3)			# load guest gprs 0-13
274	lg	%r14,__LC_GMAP			# get gmap pointer
275	ltgr	%r14,%r14
276	jz	.Lsie_gmap
277	lctlg	%c1,%c1,__GMAP_ASCE(%r14)	# load primary asce
278.Lsie_gmap:
279	lg	%r14,__SF_SIE_CONTROL(%r15)	# get control block pointer
280	oi	__SIE_PROG0C+3(%r14),1		# we are going into SIE now
281	tm	__SIE_PROG20+3(%r14),3		# last exit...
282	jnz	.Lsie_skip
283	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
284	jo	.Lsie_skip			# exit if fp/vx regs changed
285	BPEXIT	__SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
286.Lsie_entry:
287	sie	0(%r14)
288.Lsie_exit:
289	BPOFF
290	BPENTER	__SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
291.Lsie_skip:
292	ni	__SIE_PROG0C+3(%r14),0xfe	# no longer in SIE
293	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
294.Lsie_done:
295# some program checks are suppressing. C code (e.g. do_protection_exception)
296# will rewind the PSW by the ILC, which is often 4 bytes in case of SIE. There
297# are some corner cases (e.g. runtime instrumentation) where ILC is unpredictable.
298# Other instructions between sie64a and .Lsie_done should not cause program
299# interrupts. So lets use 3 nops as a landing pad for all possible rewinds.
300# See also .Lcleanup_sie
301.Lrewind_pad6:
302	nopr	7
303.Lrewind_pad4:
304	nopr	7
305.Lrewind_pad2:
306	nopr	7
307	.globl sie_exit
308sie_exit:
309	lg	%r14,__SF_SIE_SAVEAREA(%r15)	# load guest register save area
310	stmg	%r0,%r13,0(%r14)		# save guest gprs 0-13
311	xgr	%r0,%r0				# clear guest registers to
312	xgr	%r1,%r1				# prevent speculative use
313	xgr	%r2,%r2
314	xgr	%r3,%r3
315	xgr	%r4,%r4
316	xgr	%r5,%r5
317	lmg	%r6,%r14,__SF_GPRS(%r15)	# restore kernel registers
318	lg	%r2,__SF_SIE_REASON(%r15)	# return exit reason code
319	BR_EX	%r14
320.Lsie_fault:
321	lghi	%r14,-EFAULT
322	stg	%r14,__SF_SIE_REASON(%r15)	# set exit reason code
323	j	sie_exit
324
325	EX_TABLE(.Lrewind_pad6,.Lsie_fault)
326	EX_TABLE(.Lrewind_pad4,.Lsie_fault)
327	EX_TABLE(.Lrewind_pad2,.Lsie_fault)
328	EX_TABLE(sie_exit,.Lsie_fault)
329ENDPROC(sie64a)
330EXPORT_SYMBOL(sie64a)
331EXPORT_SYMBOL(sie_exit)
332#endif
333
334/*
335 * SVC interrupt handler routine. System calls are synchronous events and
336 * are executed with interrupts enabled.
337 */
338
339ENTRY(system_call)
340	stpt	__LC_SYNC_ENTER_TIMER
341.Lsysc_stmg:
342	stmg	%r8,%r15,__LC_SAVE_AREA_SYNC
343	BPOFF
344	lg	%r12,__LC_CURRENT
345	lghi	%r13,__TASK_thread
346	lghi	%r14,_PIF_SYSCALL
347.Lsysc_per:
348	lg	%r15,__LC_KERNEL_STACK
349	la	%r11,STACK_FRAME_OVERHEAD(%r15)	# pointer to pt_regs
350.Lsysc_vtime:
351	UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER
352	BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
353	stmg	%r0,%r7,__PT_R0(%r11)
354	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
355	mvc	__PT_PSW(16,%r11),__LC_SVC_OLD_PSW
356	mvc	__PT_INT_CODE(4,%r11),__LC_SVC_ILC
357	stg	%r14,__PT_FLAGS(%r11)
358.Lsysc_do_svc:
359	# clear user controlled register to prevent speculative use
360	xgr	%r0,%r0
361	# load address of system call table
362	lg	%r10,__THREAD_sysc_table(%r13,%r12)
363	llgh	%r8,__PT_INT_CODE+2(%r11)
364	slag	%r8,%r8,3			# shift and test for svc 0
365	jnz	.Lsysc_nr_ok
366	# svc 0: system call number in %r1
367	llgfr	%r1,%r1				# clear high word in r1
368	cghi	%r1,NR_syscalls
369	jnl	.Lsysc_nr_ok
370	sth	%r1,__PT_INT_CODE+2(%r11)
371	slag	%r8,%r1,3
372.Lsysc_nr_ok:
373	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
374	stg	%r2,__PT_ORIG_GPR2(%r11)
375	stg	%r7,STACK_FRAME_OVERHEAD(%r15)
376	lg	%r9,0(%r8,%r10)			# get system call add.
377	TSTMSK	__TI_flags(%r12),_TIF_TRACE
378	jnz	.Lsysc_tracesys
379	BASR_EX	%r14,%r9			# call sys_xxxx
380	stg	%r2,__PT_R2(%r11)		# store return value
381
382.Lsysc_return:
383#ifdef CONFIG_DEBUG_RSEQ
384	lgr	%r2,%r11
385	brasl	%r14,rseq_syscall
386#endif
387	LOCKDEP_SYS_EXIT
388.Lsysc_tif:
389	TSTMSK	__PT_FLAGS(%r11),_PIF_WORK
390	jnz	.Lsysc_work
391	TSTMSK	__TI_flags(%r12),_TIF_WORK
392	jnz	.Lsysc_work			# check for work
393	TSTMSK	__LC_CPU_FLAGS,_CIF_WORK
394	jnz	.Lsysc_work
395	BPEXIT	__TI_flags(%r12),_TIF_ISOLATE_BP
396.Lsysc_restore:
397	lg	%r14,__LC_VDSO_PER_CPU
398	lmg	%r0,%r10,__PT_R0(%r11)
399	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r11)
400.Lsysc_exit_timer:
401	stpt	__LC_EXIT_TIMER
402	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
403	lmg	%r11,%r15,__PT_R11(%r11)
404	lpswe	__LC_RETURN_PSW
405.Lsysc_done:
406
407#
408# One of the work bits is on. Find out which one.
409#
410.Lsysc_work:
411	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
412	jo	.Lsysc_mcck_pending
413	TSTMSK	__TI_flags(%r12),_TIF_NEED_RESCHED
414	jo	.Lsysc_reschedule
415	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL_RESTART
416	jo	.Lsysc_syscall_restart
417#ifdef CONFIG_UPROBES
418	TSTMSK	__TI_flags(%r12),_TIF_UPROBE
419	jo	.Lsysc_uprobe_notify
420#endif
421	TSTMSK	__TI_flags(%r12),_TIF_GUARDED_STORAGE
422	jo	.Lsysc_guarded_storage
423	TSTMSK	__PT_FLAGS(%r11),_PIF_PER_TRAP
424	jo	.Lsysc_singlestep
425#ifdef CONFIG_LIVEPATCH
426	TSTMSK	__TI_flags(%r12),_TIF_PATCH_PENDING
427	jo	.Lsysc_patch_pending	# handle live patching just before
428					# signals and possible syscall restart
429#endif
430	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL_RESTART
431	jo	.Lsysc_syscall_restart
432	TSTMSK	__TI_flags(%r12),_TIF_SIGPENDING
433	jo	.Lsysc_sigpending
434	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_RESUME
435	jo	.Lsysc_notify_resume
436	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
437	jo	.Lsysc_vxrs
438	TSTMSK	__LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY)
439	jnz	.Lsysc_asce
440	j	.Lsysc_return		# beware of critical section cleanup
441
442#
443# _TIF_NEED_RESCHED is set, call schedule
444#
445.Lsysc_reschedule:
446	larl	%r14,.Lsysc_return
447	jg	schedule
448
449#
450# _CIF_MCCK_PENDING is set, call handler
451#
452.Lsysc_mcck_pending:
453	larl	%r14,.Lsysc_return
454	jg	s390_handle_mcck	# TIF bit will be cleared by handler
455
456#
457# _CIF_ASCE_PRIMARY and/or _CIF_ASCE_SECONDARY set, load user space asce
458#
459.Lsysc_asce:
460	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE_SECONDARY
461	lctlg	%c7,%c7,__LC_VDSO_ASCE		# load secondary asce
462	TSTMSK	__LC_CPU_FLAGS,_CIF_ASCE_PRIMARY
463	jz	.Lsysc_return
464#ifndef CONFIG_HAVE_MARCH_Z10_FEATURES
465	tm	__LC_STFLE_FAC_LIST+3,0x10	# has MVCOS ?
466	jnz	.Lsysc_set_fs_fixup
467	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
468	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
469	j	.Lsysc_return
470.Lsysc_set_fs_fixup:
471#endif
472	larl	%r14,.Lsysc_return
473	jg	set_fs_fixup
474
475#
476# CIF_FPU is set, restore floating-point controls and floating-point registers.
477#
478.Lsysc_vxrs:
479	larl	%r14,.Lsysc_return
480	jg	load_fpu_regs
481
482#
483# _TIF_SIGPENDING is set, call do_signal
484#
485.Lsysc_sigpending:
486	lgr	%r2,%r11		# pass pointer to pt_regs
487	brasl	%r14,do_signal
488	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL
489	jno	.Lsysc_return
490.Lsysc_do_syscall:
491	lghi	%r13,__TASK_thread
492	lmg	%r2,%r7,__PT_R2(%r11)	# load svc arguments
493	lghi	%r1,0			# svc 0 returns -ENOSYS
494	j	.Lsysc_do_svc
495
496#
497# _TIF_NOTIFY_RESUME is set, call do_notify_resume
498#
499.Lsysc_notify_resume:
500	lgr	%r2,%r11		# pass pointer to pt_regs
501	larl	%r14,.Lsysc_return
502	jg	do_notify_resume
503
504#
505# _TIF_UPROBE is set, call uprobe_notify_resume
506#
507#ifdef CONFIG_UPROBES
508.Lsysc_uprobe_notify:
509	lgr	%r2,%r11		# pass pointer to pt_regs
510	larl	%r14,.Lsysc_return
511	jg	uprobe_notify_resume
512#endif
513
514#
515# _TIF_GUARDED_STORAGE is set, call guarded_storage_load
516#
517.Lsysc_guarded_storage:
518	lgr	%r2,%r11		# pass pointer to pt_regs
519	larl	%r14,.Lsysc_return
520	jg	gs_load_bc_cb
521#
522# _TIF_PATCH_PENDING is set, call klp_update_patch_state
523#
524#ifdef CONFIG_LIVEPATCH
525.Lsysc_patch_pending:
526	lg	%r2,__LC_CURRENT	# pass pointer to task struct
527	larl	%r14,.Lsysc_return
528	jg	klp_update_patch_state
529#endif
530
531#
532# _PIF_PER_TRAP is set, call do_per_trap
533#
534.Lsysc_singlestep:
535	ni	__PT_FLAGS+7(%r11),255-_PIF_PER_TRAP
536	lgr	%r2,%r11		# pass pointer to pt_regs
537	larl	%r14,.Lsysc_return
538	jg	do_per_trap
539
540#
541# _PIF_SYSCALL_RESTART is set, repeat the current system call
542#
543.Lsysc_syscall_restart:
544	ni	__PT_FLAGS+7(%r11),255-_PIF_SYSCALL_RESTART
545	lmg	%r1,%r7,__PT_R1(%r11)	# load svc arguments
546	lg	%r2,__PT_ORIG_GPR2(%r11)
547	j	.Lsysc_do_svc
548
549#
550# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
551# and after the system call
552#
553.Lsysc_tracesys:
554	lgr	%r2,%r11		# pass pointer to pt_regs
555	la	%r3,0
556	llgh	%r0,__PT_INT_CODE+2(%r11)
557	stg	%r0,__PT_R2(%r11)
558	brasl	%r14,do_syscall_trace_enter
559	lghi	%r0,NR_syscalls
560	clgr	%r0,%r2
561	jnh	.Lsysc_tracenogo
562	sllg	%r8,%r2,3
563	lg	%r9,0(%r8,%r10)
564.Lsysc_tracego:
565	lmg	%r3,%r7,__PT_R3(%r11)
566	stg	%r7,STACK_FRAME_OVERHEAD(%r15)
567	lg	%r2,__PT_ORIG_GPR2(%r11)
568	BASR_EX	%r14,%r9		# call sys_xxx
569	stg	%r2,__PT_R2(%r11)	# store return value
570.Lsysc_tracenogo:
571	TSTMSK	__TI_flags(%r12),_TIF_TRACE
572	jz	.Lsysc_return
573	lgr	%r2,%r11		# pass pointer to pt_regs
574	larl	%r14,.Lsysc_return
575	jg	do_syscall_trace_exit
576ENDPROC(system_call)
577
578#
579# a new process exits the kernel with ret_from_fork
580#
581ENTRY(ret_from_fork)
582	la	%r11,STACK_FRAME_OVERHEAD(%r15)
583	lg	%r12,__LC_CURRENT
584	brasl	%r14,schedule_tail
585	TRACE_IRQS_ON
586	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
587	tm	__PT_PSW+1(%r11),0x01	# forking a kernel thread ?
588	jne	.Lsysc_tracenogo
589	# it's a kernel thread
590	lmg	%r9,%r10,__PT_R9(%r11)	# load gprs
591	la	%r2,0(%r10)
592	BASR_EX	%r14,%r9
593	j	.Lsysc_tracenogo
594ENDPROC(ret_from_fork)
595
596ENTRY(kernel_thread_starter)
597	la	%r2,0(%r10)
598	BASR_EX	%r14,%r9
599	j	.Lsysc_tracenogo
600ENDPROC(kernel_thread_starter)
601
602/*
603 * Program check handler routine
604 */
605
606ENTRY(pgm_check_handler)
607	stpt	__LC_SYNC_ENTER_TIMER
608	BPOFF
609	stmg	%r8,%r15,__LC_SAVE_AREA_SYNC
610	lg	%r10,__LC_LAST_BREAK
611	lg	%r12,__LC_CURRENT
612	lghi	%r11,0
613	larl	%r13,cleanup_critical
614	lmg	%r8,%r9,__LC_PGM_OLD_PSW
615	tmhh	%r8,0x0001		# test problem state bit
616	jnz	2f			# -> fault in user space
617#if IS_ENABLED(CONFIG_KVM)
618	# cleanup critical section for program checks in sie64a
619	lgr	%r14,%r9
620	slg	%r14,BASED(.Lsie_critical_start)
621	clg	%r14,BASED(.Lsie_critical_length)
622	jhe	0f
623	lg	%r14,__SF_SIE_CONTROL(%r15)	# get control block pointer
624	ni	__SIE_PROG0C+3(%r14),0xfe	# no longer in SIE
625	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
626	larl	%r9,sie_exit			# skip forward to sie_exit
627	lghi	%r11,_PIF_GUEST_FAULT
628#endif
6290:	tmhh	%r8,0x4000		# PER bit set in old PSW ?
630	jnz	1f			# -> enabled, can't be a double fault
631	tm	__LC_PGM_ILC+3,0x80	# check for per exception
632	jnz	.Lpgm_svcper		# -> single stepped svc
6331:	CHECK_STACK __LC_SAVE_AREA_SYNC
634	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
635	# CHECK_VMAP_STACK branches to stack_overflow or 4f
636	CHECK_VMAP_STACK __LC_SAVE_AREA_SYNC,4f
6372:	UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER
638	BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
639	lg	%r15,__LC_KERNEL_STACK
640	lgr	%r14,%r12
641	aghi	%r14,__TASK_thread	# pointer to thread_struct
642	lghi	%r13,__LC_PGM_TDB
643	tm	__LC_PGM_ILC+2,0x02	# check for transaction abort
644	jz	3f
645	mvc	__THREAD_trap_tdb(256,%r14),0(%r13)
6463:	stg	%r10,__THREAD_last_break(%r14)
6474:	lgr	%r13,%r11
648	la	%r11,STACK_FRAME_OVERHEAD(%r15)
649	stmg	%r0,%r7,__PT_R0(%r11)
650	# clear user controlled registers to prevent speculative use
651	xgr	%r0,%r0
652	xgr	%r1,%r1
653	xgr	%r2,%r2
654	xgr	%r3,%r3
655	xgr	%r4,%r4
656	xgr	%r5,%r5
657	xgr	%r6,%r6
658	xgr	%r7,%r7
659	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
660	stmg	%r8,%r9,__PT_PSW(%r11)
661	mvc	__PT_INT_CODE(4,%r11),__LC_PGM_ILC
662	mvc	__PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
663	stg	%r13,__PT_FLAGS(%r11)
664	stg	%r10,__PT_ARGS(%r11)
665	tm	__LC_PGM_ILC+3,0x80	# check for per exception
666	jz	5f
667	tmhh	%r8,0x0001		# kernel per event ?
668	jz	.Lpgm_kprobe
669	oi	__PT_FLAGS+7(%r11),_PIF_PER_TRAP
670	mvc	__THREAD_per_address(8,%r14),__LC_PER_ADDRESS
671	mvc	__THREAD_per_cause(2,%r14),__LC_PER_CODE
672	mvc	__THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID
6735:	REENABLE_IRQS
674	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
675	larl	%r1,pgm_check_table
676	llgh	%r10,__PT_INT_CODE+2(%r11)
677	nill	%r10,0x007f
678	sll	%r10,3
679	je	.Lpgm_return
680	lg	%r9,0(%r10,%r1)		# load address of handler routine
681	lgr	%r2,%r11		# pass pointer to pt_regs
682	BASR_EX	%r14,%r9		# branch to interrupt-handler
683.Lpgm_return:
684	LOCKDEP_SYS_EXIT
685	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
686	jno	.Lsysc_restore
687	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL
688	jo	.Lsysc_do_syscall
689	j	.Lsysc_tif
690
691#
692# PER event in supervisor state, must be kprobes
693#
694.Lpgm_kprobe:
695	REENABLE_IRQS
696	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
697	lgr	%r2,%r11		# pass pointer to pt_regs
698	brasl	%r14,do_per_trap
699	j	.Lpgm_return
700
701#
702# single stepped system call
703#
704.Lpgm_svcper:
705	mvc	__LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
706	lghi	%r13,__TASK_thread
707	larl	%r14,.Lsysc_per
708	stg	%r14,__LC_RETURN_PSW+8
709	lghi	%r14,_PIF_SYSCALL | _PIF_PER_TRAP
710	lpswe	__LC_RETURN_PSW		# branch to .Lsysc_per and enable irqs
711ENDPROC(pgm_check_handler)
712
713/*
714 * IO interrupt handler routine
715 */
716ENTRY(io_int_handler)
717	STCK	__LC_INT_CLOCK
718	stpt	__LC_ASYNC_ENTER_TIMER
719	BPOFF
720	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
721	lg	%r12,__LC_CURRENT
722	larl	%r13,cleanup_critical
723	lmg	%r8,%r9,__LC_IO_OLD_PSW
724	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
725	stmg	%r0,%r7,__PT_R0(%r11)
726	# clear user controlled registers to prevent speculative use
727	xgr	%r0,%r0
728	xgr	%r1,%r1
729	xgr	%r2,%r2
730	xgr	%r3,%r3
731	xgr	%r4,%r4
732	xgr	%r5,%r5
733	xgr	%r6,%r6
734	xgr	%r7,%r7
735	xgr	%r10,%r10
736	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
737	stmg	%r8,%r9,__PT_PSW(%r11)
738	mvc	__PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
739	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
740	TSTMSK	__LC_CPU_FLAGS,_CIF_IGNORE_IRQ
741	jo	.Lio_restore
742	TRACE_IRQS_OFF
743	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
744.Lio_loop:
745	lgr	%r2,%r11		# pass pointer to pt_regs
746	lghi	%r3,IO_INTERRUPT
747	tm	__PT_INT_CODE+8(%r11),0x80	# adapter interrupt ?
748	jz	.Lio_call
749	lghi	%r3,THIN_INTERRUPT
750.Lio_call:
751	brasl	%r14,do_IRQ
752	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_LPAR
753	jz	.Lio_return
754	tpi	0
755	jz	.Lio_return
756	mvc	__PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
757	j	.Lio_loop
758.Lio_return:
759	LOCKDEP_SYS_EXIT
760	TRACE_IRQS_ON
761.Lio_tif:
762	TSTMSK	__TI_flags(%r12),_TIF_WORK
763	jnz	.Lio_work		# there is work to do (signals etc.)
764	TSTMSK	__LC_CPU_FLAGS,_CIF_WORK
765	jnz	.Lio_work
766.Lio_restore:
767	lg	%r14,__LC_VDSO_PER_CPU
768	lmg	%r0,%r10,__PT_R0(%r11)
769	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r11)
770	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
771	jno	.Lio_exit_kernel
772	BPEXIT	__TI_flags(%r12),_TIF_ISOLATE_BP
773.Lio_exit_timer:
774	stpt	__LC_EXIT_TIMER
775	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
776.Lio_exit_kernel:
777	lmg	%r11,%r15,__PT_R11(%r11)
778	lpswe	__LC_RETURN_PSW
779.Lio_done:
780
781#
782# There is work todo, find out in which context we have been interrupted:
783# 1) if we return to user space we can do all _TIF_WORK work
784# 2) if we return to kernel code and kvm is enabled check if we need to
785#    modify the psw to leave SIE
786# 3) if we return to kernel code and preemptive scheduling is enabled check
787#    the preemption counter and if it is zero call preempt_schedule_irq
788# Before any work can be done, a switch to the kernel stack is required.
789#
790.Lio_work:
791	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
792	jo	.Lio_work_user		# yes -> do resched & signal
793#ifdef CONFIG_PREEMPT
794	# check for preemptive scheduling
795	icm	%r0,15,__LC_PREEMPT_COUNT
796	jnz	.Lio_restore		# preemption is disabled
797	TSTMSK	__TI_flags(%r12),_TIF_NEED_RESCHED
798	jno	.Lio_restore
799	# switch to kernel stack
800	lg	%r1,__PT_R15(%r11)
801	aghi	%r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
802	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
803	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
804	la	%r11,STACK_FRAME_OVERHEAD(%r1)
805	lgr	%r15,%r1
806	# TRACE_IRQS_ON already done at .Lio_return, call
807	# TRACE_IRQS_OFF to keep things symmetrical
808	TRACE_IRQS_OFF
809	brasl	%r14,preempt_schedule_irq
810	j	.Lio_return
811#else
812	j	.Lio_restore
813#endif
814
815#
816# Need to do work before returning to userspace, switch to kernel stack
817#
818.Lio_work_user:
819	lg	%r1,__LC_KERNEL_STACK
820	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
821	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
822	la	%r11,STACK_FRAME_OVERHEAD(%r1)
823	lgr	%r15,%r1
824
825#
826# One of the work bits is on. Find out which one.
827#
828.Lio_work_tif:
829	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
830	jo	.Lio_mcck_pending
831	TSTMSK	__TI_flags(%r12),_TIF_NEED_RESCHED
832	jo	.Lio_reschedule
833#ifdef CONFIG_LIVEPATCH
834	TSTMSK	__TI_flags(%r12),_TIF_PATCH_PENDING
835	jo	.Lio_patch_pending
836#endif
837	TSTMSK	__TI_flags(%r12),_TIF_SIGPENDING
838	jo	.Lio_sigpending
839	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_RESUME
840	jo	.Lio_notify_resume
841	TSTMSK	__TI_flags(%r12),_TIF_GUARDED_STORAGE
842	jo	.Lio_guarded_storage
843	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
844	jo	.Lio_vxrs
845	TSTMSK	__LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY)
846	jnz	.Lio_asce
847	j	.Lio_return		# beware of critical section cleanup
848
849#
850# _CIF_MCCK_PENDING is set, call handler
851#
852.Lio_mcck_pending:
853	# TRACE_IRQS_ON already done at .Lio_return
854	brasl	%r14,s390_handle_mcck	# TIF bit will be cleared by handler
855	TRACE_IRQS_OFF
856	j	.Lio_return
857
858#
859# _CIF_ASCE_PRIMARY and/or CIF_ASCE_SECONDARY set, load user space asce
860#
861.Lio_asce:
862	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE_SECONDARY
863	lctlg	%c7,%c7,__LC_VDSO_ASCE		# load secondary asce
864	TSTMSK	__LC_CPU_FLAGS,_CIF_ASCE_PRIMARY
865	jz	.Lio_return
866#ifndef CONFIG_HAVE_MARCH_Z10_FEATURES
867	tm	__LC_STFLE_FAC_LIST+3,0x10	# has MVCOS ?
868	jnz	.Lio_set_fs_fixup
869	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
870	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
871	j	.Lio_return
872.Lio_set_fs_fixup:
873#endif
874	larl	%r14,.Lio_return
875	jg	set_fs_fixup
876
877#
878# CIF_FPU is set, restore floating-point controls and floating-point registers.
879#
880.Lio_vxrs:
881	larl	%r14,.Lio_return
882	jg	load_fpu_regs
883
884#
885# _TIF_GUARDED_STORAGE is set, call guarded_storage_load
886#
887.Lio_guarded_storage:
888	# TRACE_IRQS_ON already done at .Lio_return
889	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
890	lgr	%r2,%r11		# pass pointer to pt_regs
891	brasl	%r14,gs_load_bc_cb
892	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
893	TRACE_IRQS_OFF
894	j	.Lio_return
895
896#
897# _TIF_NEED_RESCHED is set, call schedule
898#
899.Lio_reschedule:
900	# TRACE_IRQS_ON already done at .Lio_return
901	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
902	brasl	%r14,schedule		# call scheduler
903	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
904	TRACE_IRQS_OFF
905	j	.Lio_return
906
907#
908# _TIF_PATCH_PENDING is set, call klp_update_patch_state
909#
910#ifdef CONFIG_LIVEPATCH
911.Lio_patch_pending:
912	lg	%r2,__LC_CURRENT	# pass pointer to task struct
913	larl	%r14,.Lio_return
914	jg	klp_update_patch_state
915#endif
916
917#
918# _TIF_SIGPENDING or is set, call do_signal
919#
920.Lio_sigpending:
921	# TRACE_IRQS_ON already done at .Lio_return
922	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
923	lgr	%r2,%r11		# pass pointer to pt_regs
924	brasl	%r14,do_signal
925	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
926	TRACE_IRQS_OFF
927	j	.Lio_return
928
929#
930# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
931#
932.Lio_notify_resume:
933	# TRACE_IRQS_ON already done at .Lio_return
934	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
935	lgr	%r2,%r11		# pass pointer to pt_regs
936	brasl	%r14,do_notify_resume
937	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
938	TRACE_IRQS_OFF
939	j	.Lio_return
940ENDPROC(io_int_handler)
941
942/*
943 * External interrupt handler routine
944 */
945ENTRY(ext_int_handler)
946	STCK	__LC_INT_CLOCK
947	stpt	__LC_ASYNC_ENTER_TIMER
948	BPOFF
949	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
950	lg	%r12,__LC_CURRENT
951	larl	%r13,cleanup_critical
952	lmg	%r8,%r9,__LC_EXT_OLD_PSW
953	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
954	stmg	%r0,%r7,__PT_R0(%r11)
955	# clear user controlled registers to prevent speculative use
956	xgr	%r0,%r0
957	xgr	%r1,%r1
958	xgr	%r2,%r2
959	xgr	%r3,%r3
960	xgr	%r4,%r4
961	xgr	%r5,%r5
962	xgr	%r6,%r6
963	xgr	%r7,%r7
964	xgr	%r10,%r10
965	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
966	stmg	%r8,%r9,__PT_PSW(%r11)
967	lghi	%r1,__LC_EXT_PARAMS2
968	mvc	__PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR
969	mvc	__PT_INT_PARM(4,%r11),__LC_EXT_PARAMS
970	mvc	__PT_INT_PARM_LONG(8,%r11),0(%r1)
971	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
972	TSTMSK	__LC_CPU_FLAGS,_CIF_IGNORE_IRQ
973	jo	.Lio_restore
974	TRACE_IRQS_OFF
975	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
976	lgr	%r2,%r11		# pass pointer to pt_regs
977	lghi	%r3,EXT_INTERRUPT
978	brasl	%r14,do_IRQ
979	j	.Lio_return
980ENDPROC(ext_int_handler)
981
982/*
983 * Load idle PSW. The second "half" of this function is in .Lcleanup_idle.
984 */
985ENTRY(psw_idle)
986	stg	%r3,__SF_EMPTY(%r15)
987	larl	%r1,.Lpsw_idle_lpsw+4
988	stg	%r1,__SF_EMPTY+8(%r15)
989	larl	%r1,smp_cpu_mtid
990	llgf	%r1,0(%r1)
991	ltgr	%r1,%r1
992	jz	.Lpsw_idle_stcctm
993	.insn	rsy,0xeb0000000017,%r1,5,__SF_EMPTY+16(%r15)
994.Lpsw_idle_stcctm:
995	oi	__LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT
996	BPON
997	STCK	__CLOCK_IDLE_ENTER(%r2)
998	stpt	__TIMER_IDLE_ENTER(%r2)
999.Lpsw_idle_lpsw:
1000	lpswe	__SF_EMPTY(%r15)
1001	BR_EX	%r14
1002.Lpsw_idle_end:
1003ENDPROC(psw_idle)
1004
1005/*
1006 * Store floating-point controls and floating-point or vector register
1007 * depending whether the vector facility is available.	A critical section
1008 * cleanup assures that the registers are stored even if interrupted for
1009 * some other work.  The CIF_FPU flag is set to trigger a lazy restore
1010 * of the register contents at return from io or a system call.
1011 */
1012ENTRY(save_fpu_regs)
1013	lg	%r2,__LC_CURRENT
1014	aghi	%r2,__TASK_thread
1015	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
1016	jo	.Lsave_fpu_regs_exit
1017	stfpc	__THREAD_FPU_fpc(%r2)
1018	lg	%r3,__THREAD_FPU_regs(%r2)
1019	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_VX
1020	jz	.Lsave_fpu_regs_fp	  # no -> store FP regs
1021	VSTM	%v0,%v15,0,%r3		  # vstm 0,15,0(3)
1022	VSTM	%v16,%v31,256,%r3	  # vstm 16,31,256(3)
1023	j	.Lsave_fpu_regs_done	  # -> set CIF_FPU flag
1024.Lsave_fpu_regs_fp:
1025	std	0,0(%r3)
1026	std	1,8(%r3)
1027	std	2,16(%r3)
1028	std	3,24(%r3)
1029	std	4,32(%r3)
1030	std	5,40(%r3)
1031	std	6,48(%r3)
1032	std	7,56(%r3)
1033	std	8,64(%r3)
1034	std	9,72(%r3)
1035	std	10,80(%r3)
1036	std	11,88(%r3)
1037	std	12,96(%r3)
1038	std	13,104(%r3)
1039	std	14,112(%r3)
1040	std	15,120(%r3)
1041.Lsave_fpu_regs_done:
1042	oi	__LC_CPU_FLAGS+7,_CIF_FPU
1043.Lsave_fpu_regs_exit:
1044	BR_EX	%r14
1045.Lsave_fpu_regs_end:
1046ENDPROC(save_fpu_regs)
1047EXPORT_SYMBOL(save_fpu_regs)
1048
1049/*
1050 * Load floating-point controls and floating-point or vector registers.
1051 * A critical section cleanup assures that the register contents are
1052 * loaded even if interrupted for some other work.
1053 *
1054 * There are special calling conventions to fit into sysc and io return work:
1055 *	%r15:	<kernel stack>
1056 * The function requires:
1057 *	%r4
1058 */
1059load_fpu_regs:
1060	lg	%r4,__LC_CURRENT
1061	aghi	%r4,__TASK_thread
1062	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
1063	jno	.Lload_fpu_regs_exit
1064	lfpc	__THREAD_FPU_fpc(%r4)
1065	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_VX
1066	lg	%r4,__THREAD_FPU_regs(%r4)	# %r4 <- reg save area
1067	jz	.Lload_fpu_regs_fp		# -> no VX, load FP regs
1068	VLM	%v0,%v15,0,%r4
1069	VLM	%v16,%v31,256,%r4
1070	j	.Lload_fpu_regs_done
1071.Lload_fpu_regs_fp:
1072	ld	0,0(%r4)
1073	ld	1,8(%r4)
1074	ld	2,16(%r4)
1075	ld	3,24(%r4)
1076	ld	4,32(%r4)
1077	ld	5,40(%r4)
1078	ld	6,48(%r4)
1079	ld	7,56(%r4)
1080	ld	8,64(%r4)
1081	ld	9,72(%r4)
1082	ld	10,80(%r4)
1083	ld	11,88(%r4)
1084	ld	12,96(%r4)
1085	ld	13,104(%r4)
1086	ld	14,112(%r4)
1087	ld	15,120(%r4)
1088.Lload_fpu_regs_done:
1089	ni	__LC_CPU_FLAGS+7,255-_CIF_FPU
1090.Lload_fpu_regs_exit:
1091	BR_EX	%r14
1092.Lload_fpu_regs_end:
1093ENDPROC(load_fpu_regs)
1094
1095.L__critical_end:
1096
1097/*
1098 * Machine check handler routines
1099 */
1100ENTRY(mcck_int_handler)
1101	STCK	__LC_MCCK_CLOCK
1102	BPOFF
1103	la	%r1,4095		# validate r1
1104	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# validate cpu timer
1105	sckc	__LC_CLOCK_COMPARATOR			# validate comparator
1106	lam	%a0,%a15,__LC_AREGS_SAVE_AREA-4095(%r1) # validate acrs
1107	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# validate gprs
1108	lg	%r12,__LC_CURRENT
1109	larl	%r13,cleanup_critical
1110	lmg	%r8,%r9,__LC_MCK_OLD_PSW
1111	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_SYSTEM_DAMAGE
1112	jo	.Lmcck_panic		# yes -> rest of mcck code invalid
1113	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_CR_VALID
1114	jno	.Lmcck_panic		# control registers invalid -> panic
1115	la	%r14,4095
1116	lctlg	%c0,%c15,__LC_CREGS_SAVE_AREA-4095(%r14) # validate ctl regs
1117	ptlb
1118	lg	%r11,__LC_MCESAD-4095(%r14) # extended machine check save area
1119	nill	%r11,0xfc00		# MCESA_ORIGIN_MASK
1120	TSTMSK	__LC_CREGS_SAVE_AREA+16-4095(%r14),CR2_GUARDED_STORAGE
1121	jno	0f
1122	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_GS_VALID
1123	jno	0f
1124	.insn	 rxy,0xe3000000004d,0,__MCESA_GS_SAVE_AREA(%r11) # LGSC
11250:	l	%r14,__LC_FP_CREG_SAVE_AREA-4095(%r14)
1126	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_FC_VALID
1127	jo	0f
1128	sr	%r14,%r14
11290:	sfpc	%r14
1130	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_VX
1131	jo	0f
1132	lghi	%r14,__LC_FPREGS_SAVE_AREA
1133	ld	%f0,0(%r14)
1134	ld	%f1,8(%r14)
1135	ld	%f2,16(%r14)
1136	ld	%f3,24(%r14)
1137	ld	%f4,32(%r14)
1138	ld	%f5,40(%r14)
1139	ld	%f6,48(%r14)
1140	ld	%f7,56(%r14)
1141	ld	%f8,64(%r14)
1142	ld	%f9,72(%r14)
1143	ld	%f10,80(%r14)
1144	ld	%f11,88(%r14)
1145	ld	%f12,96(%r14)
1146	ld	%f13,104(%r14)
1147	ld	%f14,112(%r14)
1148	ld	%f15,120(%r14)
1149	j	1f
11500:	VLM	%v0,%v15,0,%r11
1151	VLM	%v16,%v31,256,%r11
11521:	lghi	%r14,__LC_CPU_TIMER_SAVE_AREA
1153	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
1154	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_CPU_TIMER_VALID
1155	jo	3f
1156	la	%r14,__LC_SYNC_ENTER_TIMER
1157	clc	0(8,%r14),__LC_ASYNC_ENTER_TIMER
1158	jl	0f
1159	la	%r14,__LC_ASYNC_ENTER_TIMER
11600:	clc	0(8,%r14),__LC_EXIT_TIMER
1161	jl	1f
1162	la	%r14,__LC_EXIT_TIMER
11631:	clc	0(8,%r14),__LC_LAST_UPDATE_TIMER
1164	jl	2f
1165	la	%r14,__LC_LAST_UPDATE_TIMER
11662:	spt	0(%r14)
1167	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
11683:	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_PSW_MWP_VALID
1169	jno	.Lmcck_panic
1170	tmhh	%r8,0x0001		# interrupting from user ?
1171	jnz	4f
1172	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_PSW_IA_VALID
1173	jno	.Lmcck_panic
11744:	ssm	__LC_PGM_NEW_PSW	# turn dat on, keep irqs off
1175	SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER
1176.Lmcck_skip:
1177	lghi	%r14,__LC_GPREGS_SAVE_AREA+64
1178	stmg	%r0,%r7,__PT_R0(%r11)
1179	# clear user controlled registers to prevent speculative use
1180	xgr	%r0,%r0
1181	xgr	%r1,%r1
1182	xgr	%r2,%r2
1183	xgr	%r3,%r3
1184	xgr	%r4,%r4
1185	xgr	%r5,%r5
1186	xgr	%r6,%r6
1187	xgr	%r7,%r7
1188	xgr	%r10,%r10
1189	mvc	__PT_R8(64,%r11),0(%r14)
1190	stmg	%r8,%r9,__PT_PSW(%r11)
1191	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
1192	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
1193	lgr	%r2,%r11		# pass pointer to pt_regs
1194	brasl	%r14,s390_do_machine_check
1195	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
1196	jno	.Lmcck_return
1197	lg	%r1,__LC_KERNEL_STACK	# switch to kernel stack
1198	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
1199	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
1200	la	%r11,STACK_FRAME_OVERHEAD(%r1)
1201	lgr	%r15,%r1
1202	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
1203	jno	.Lmcck_return
1204	TRACE_IRQS_OFF
1205	brasl	%r14,s390_handle_mcck
1206	TRACE_IRQS_ON
1207.Lmcck_return:
1208	lg	%r14,__LC_VDSO_PER_CPU
1209	lmg	%r0,%r10,__PT_R0(%r11)
1210	mvc	__LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
1211	tm	__LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
1212	jno	0f
1213	BPEXIT	__TI_flags(%r12),_TIF_ISOLATE_BP
1214	stpt	__LC_EXIT_TIMER
1215	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
12160:	lmg	%r11,%r15,__PT_R11(%r11)
1217	lpswe	__LC_RETURN_MCCK_PSW
1218
1219.Lmcck_panic:
1220	lg	%r15,__LC_NODAT_STACK
1221	la	%r11,STACK_FRAME_OVERHEAD(%r15)
1222	j	.Lmcck_skip
1223ENDPROC(mcck_int_handler)
1224
1225#
1226# PSW restart interrupt handler
1227#
1228ENTRY(restart_int_handler)
1229	ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40
1230	stg	%r15,__LC_SAVE_AREA_RESTART
1231	lg	%r15,__LC_RESTART_STACK
1232	xc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r15),STACK_FRAME_OVERHEAD(%r15)
1233	stmg	%r0,%r14,STACK_FRAME_OVERHEAD+__PT_R0(%r15)
1234	mvc	STACK_FRAME_OVERHEAD+__PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
1235	mvc	STACK_FRAME_OVERHEAD+__PT_PSW(16,%r15),__LC_RST_OLD_PSW
1236	xc	0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
1237	lg	%r1,__LC_RESTART_FN		# load fn, parm & source cpu
1238	lg	%r2,__LC_RESTART_DATA
1239	lg	%r3,__LC_RESTART_SOURCE
1240	ltgr	%r3,%r3				# test source cpu address
1241	jm	1f				# negative -> skip source stop
12420:	sigp	%r4,%r3,SIGP_SENSE		# sigp sense to source cpu
1243	brc	10,0b				# wait for status stored
12441:	basr	%r14,%r1			# call function
1245	stap	__SF_EMPTY(%r15)		# store cpu address
1246	llgh	%r3,__SF_EMPTY(%r15)
12472:	sigp	%r4,%r3,SIGP_STOP		# sigp stop to current cpu
1248	brc	2,2b
12493:	j	3b
1250ENDPROC(restart_int_handler)
1251
1252	.section .kprobes.text, "ax"
1253
1254#if defined(CONFIG_CHECK_STACK) || defined(CONFIG_VMAP_STACK)
1255/*
1256 * The synchronous or the asynchronous stack overflowed. We are dead.
1257 * No need to properly save the registers, we are going to panic anyway.
1258 * Setup a pt_regs so that show_trace can provide a good call trace.
1259 */
1260ENTRY(stack_overflow)
1261	lg	%r15,__LC_NODAT_STACK	# change to panic stack
1262	la	%r11,STACK_FRAME_OVERHEAD(%r15)
1263	stmg	%r0,%r7,__PT_R0(%r11)
1264	stmg	%r8,%r9,__PT_PSW(%r11)
1265	mvc	__PT_R8(64,%r11),0(%r14)
1266	stg	%r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2
1267	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
1268	lgr	%r2,%r11		# pass pointer to pt_regs
1269	jg	kernel_stack_overflow
1270ENDPROC(stack_overflow)
1271#endif
1272
1273ENTRY(cleanup_critical)
1274#if IS_ENABLED(CONFIG_KVM)
1275	clg	%r9,BASED(.Lcleanup_table_sie)	# .Lsie_gmap
1276	jl	0f
1277	clg	%r9,BASED(.Lcleanup_table_sie+8)# .Lsie_done
1278	jl	.Lcleanup_sie
1279#endif
1280	clg	%r9,BASED(.Lcleanup_table)	# system_call
1281	jl	0f
1282	clg	%r9,BASED(.Lcleanup_table+8)	# .Lsysc_do_svc
1283	jl	.Lcleanup_system_call
1284	clg	%r9,BASED(.Lcleanup_table+16)	# .Lsysc_tif
1285	jl	0f
1286	clg	%r9,BASED(.Lcleanup_table+24)	# .Lsysc_restore
1287	jl	.Lcleanup_sysc_tif
1288	clg	%r9,BASED(.Lcleanup_table+32)	# .Lsysc_done
1289	jl	.Lcleanup_sysc_restore
1290	clg	%r9,BASED(.Lcleanup_table+40)	# .Lio_tif
1291	jl	0f
1292	clg	%r9,BASED(.Lcleanup_table+48)	# .Lio_restore
1293	jl	.Lcleanup_io_tif
1294	clg	%r9,BASED(.Lcleanup_table+56)	# .Lio_done
1295	jl	.Lcleanup_io_restore
1296	clg	%r9,BASED(.Lcleanup_table+64)	# psw_idle
1297	jl	0f
1298	clg	%r9,BASED(.Lcleanup_table+72)	# .Lpsw_idle_end
1299	jl	.Lcleanup_idle
1300	clg	%r9,BASED(.Lcleanup_table+80)	# save_fpu_regs
1301	jl	0f
1302	clg	%r9,BASED(.Lcleanup_table+88)	# .Lsave_fpu_regs_end
1303	jl	.Lcleanup_save_fpu_regs
1304	clg	%r9,BASED(.Lcleanup_table+96)	# load_fpu_regs
1305	jl	0f
1306	clg	%r9,BASED(.Lcleanup_table+104)	# .Lload_fpu_regs_end
1307	jl	.Lcleanup_load_fpu_regs
13080:	BR_EX	%r14,%r11
1309ENDPROC(cleanup_critical)
1310
1311	.align	8
1312.Lcleanup_table:
1313	.quad	system_call
1314	.quad	.Lsysc_do_svc
1315	.quad	.Lsysc_tif
1316	.quad	.Lsysc_restore
1317	.quad	.Lsysc_done
1318	.quad	.Lio_tif
1319	.quad	.Lio_restore
1320	.quad	.Lio_done
1321	.quad	psw_idle
1322	.quad	.Lpsw_idle_end
1323	.quad	save_fpu_regs
1324	.quad	.Lsave_fpu_regs_end
1325	.quad	load_fpu_regs
1326	.quad	.Lload_fpu_regs_end
1327
1328#if IS_ENABLED(CONFIG_KVM)
1329.Lcleanup_table_sie:
1330	.quad	.Lsie_gmap
1331	.quad	.Lsie_done
1332
1333.Lcleanup_sie:
1334	cghi    %r11,__LC_SAVE_AREA_ASYNC 	#Is this in normal interrupt?
1335	je      1f
1336	slg     %r9,BASED(.Lsie_crit_mcck_start)
1337	clg     %r9,BASED(.Lsie_crit_mcck_length)
1338	jh      1f
1339	oi      __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST
13401:	BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
1341	lg	%r9,__SF_SIE_CONTROL(%r15)	# get control block pointer
1342	ni	__SIE_PROG0C+3(%r9),0xfe	# no longer in SIE
1343	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
1344	larl	%r9,sie_exit			# skip forward to sie_exit
1345	BR_EX	%r14,%r11
1346#endif
1347
1348.Lcleanup_system_call:
1349	# check if stpt has been executed
1350	clg	%r9,BASED(.Lcleanup_system_call_insn)
1351	jh	0f
1352	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
1353	cghi	%r11,__LC_SAVE_AREA_ASYNC
1354	je	0f
1355	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
13560:	# check if stmg has been executed
1357	clg	%r9,BASED(.Lcleanup_system_call_insn+8)
1358	jh	0f
1359	mvc	__LC_SAVE_AREA_SYNC(64),0(%r11)
13600:	# check if base register setup + TIF bit load has been done
1361	clg	%r9,BASED(.Lcleanup_system_call_insn+16)
1362	jhe	0f
1363	# set up saved register r12 task struct pointer
1364	stg	%r12,32(%r11)
1365	# set up saved register r13 __TASK_thread offset
1366	mvc	40(8,%r11),BASED(.Lcleanup_system_call_const)
13670:	# check if the user time update has been done
1368	clg	%r9,BASED(.Lcleanup_system_call_insn+24)
1369	jh	0f
1370	lg	%r15,__LC_EXIT_TIMER
1371	slg	%r15,__LC_SYNC_ENTER_TIMER
1372	alg	%r15,__LC_USER_TIMER
1373	stg	%r15,__LC_USER_TIMER
13740:	# check if the system time update has been done
1375	clg	%r9,BASED(.Lcleanup_system_call_insn+32)
1376	jh	0f
1377	lg	%r15,__LC_LAST_UPDATE_TIMER
1378	slg	%r15,__LC_EXIT_TIMER
1379	alg	%r15,__LC_SYSTEM_TIMER
1380	stg	%r15,__LC_SYSTEM_TIMER
13810:	# update accounting time stamp
1382	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
1383	BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
1384	# set up saved register r11
1385	lg	%r15,__LC_KERNEL_STACK
1386	la	%r9,STACK_FRAME_OVERHEAD(%r15)
1387	stg	%r9,24(%r11)		# r11 pt_regs pointer
1388	# fill pt_regs
1389	mvc	__PT_R8(64,%r9),__LC_SAVE_AREA_SYNC
1390	stmg	%r0,%r7,__PT_R0(%r9)
1391	mvc	__PT_PSW(16,%r9),__LC_SVC_OLD_PSW
1392	mvc	__PT_INT_CODE(4,%r9),__LC_SVC_ILC
1393	xc	__PT_FLAGS(8,%r9),__PT_FLAGS(%r9)
1394	mvi	__PT_FLAGS+7(%r9),_PIF_SYSCALL
1395	# setup saved register r15
1396	stg	%r15,56(%r11)		# r15 stack pointer
1397	# set new psw address and exit
1398	larl	%r9,.Lsysc_do_svc
1399	BR_EX	%r14,%r11
1400.Lcleanup_system_call_insn:
1401	.quad	system_call
1402	.quad	.Lsysc_stmg
1403	.quad	.Lsysc_per
1404	.quad	.Lsysc_vtime+36
1405	.quad	.Lsysc_vtime+42
1406.Lcleanup_system_call_const:
1407	.quad	__TASK_thread
1408
1409.Lcleanup_sysc_tif:
1410	larl	%r9,.Lsysc_tif
1411	BR_EX	%r14,%r11
1412
1413.Lcleanup_sysc_restore:
1414	# check if stpt has been executed
1415	clg	%r9,BASED(.Lcleanup_sysc_restore_insn)
1416	jh	0f
1417	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
1418	cghi	%r11,__LC_SAVE_AREA_ASYNC
1419	je	0f
1420	mvc	__LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
14210:	clg	%r9,BASED(.Lcleanup_sysc_restore_insn+8)
1422	je	1f
1423	lg	%r9,24(%r11)		# get saved pointer to pt_regs
1424	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r9)
1425	mvc	0(64,%r11),__PT_R8(%r9)
1426	lmg	%r0,%r7,__PT_R0(%r9)
14271:	lmg	%r8,%r9,__LC_RETURN_PSW
1428	BR_EX	%r14,%r11
1429.Lcleanup_sysc_restore_insn:
1430	.quad	.Lsysc_exit_timer
1431	.quad	.Lsysc_done - 4
1432
1433.Lcleanup_io_tif:
1434	larl	%r9,.Lio_tif
1435	BR_EX	%r14,%r11
1436
1437.Lcleanup_io_restore:
1438	# check if stpt has been executed
1439	clg	%r9,BASED(.Lcleanup_io_restore_insn)
1440	jh	0f
1441	mvc	__LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
14420:	clg	%r9,BASED(.Lcleanup_io_restore_insn+8)
1443	je	1f
1444	lg	%r9,24(%r11)		# get saved r11 pointer to pt_regs
1445	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r9)
1446	mvc	0(64,%r11),__PT_R8(%r9)
1447	lmg	%r0,%r7,__PT_R0(%r9)
14481:	lmg	%r8,%r9,__LC_RETURN_PSW
1449	BR_EX	%r14,%r11
1450.Lcleanup_io_restore_insn:
1451	.quad	.Lio_exit_timer
1452	.quad	.Lio_done - 4
1453
1454.Lcleanup_idle:
1455	ni	__LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT
1456	# copy interrupt clock & cpu timer
1457	mvc	__CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK
1458	mvc	__TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER
1459	cghi	%r11,__LC_SAVE_AREA_ASYNC
1460	je	0f
1461	mvc	__CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
1462	mvc	__TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER
14630:	# check if stck & stpt have been executed
1464	clg	%r9,BASED(.Lcleanup_idle_insn)
1465	jhe	1f
1466	mvc	__CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
1467	mvc	__TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
14681:	# calculate idle cycles
1469	clg	%r9,BASED(.Lcleanup_idle_insn)
1470	jl	3f
1471	larl	%r1,smp_cpu_mtid
1472	llgf	%r1,0(%r1)
1473	ltgr	%r1,%r1
1474	jz	3f
1475	.insn	rsy,0xeb0000000017,%r1,5,__SF_EMPTY+80(%r15)
1476	larl	%r3,mt_cycles
1477	ag	%r3,__LC_PERCPU_OFFSET
1478	la	%r4,__SF_EMPTY+16(%r15)
14792:	lg	%r0,0(%r3)
1480	slg	%r0,0(%r4)
1481	alg	%r0,64(%r4)
1482	stg	%r0,0(%r3)
1483	la	%r3,8(%r3)
1484	la	%r4,8(%r4)
1485	brct	%r1,2b
14863:	# account system time going idle
1487	lg	%r9,__LC_STEAL_TIMER
1488	alg	%r9,__CLOCK_IDLE_ENTER(%r2)
1489	slg	%r9,__LC_LAST_UPDATE_CLOCK
1490	stg	%r9,__LC_STEAL_TIMER
1491	mvc	__LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
1492	lg	%r9,__LC_SYSTEM_TIMER
1493	alg	%r9,__LC_LAST_UPDATE_TIMER
1494	slg	%r9,__TIMER_IDLE_ENTER(%r2)
1495	stg	%r9,__LC_SYSTEM_TIMER
1496	mvc	__LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
1497	# prepare return psw
1498	nihh	%r8,0xfcfd		# clear irq & wait state bits
1499	lg	%r9,48(%r11)		# return from psw_idle
1500	BR_EX	%r14,%r11
1501.Lcleanup_idle_insn:
1502	.quad	.Lpsw_idle_lpsw
1503
1504.Lcleanup_save_fpu_regs:
1505	larl	%r9,save_fpu_regs
1506	BR_EX	%r14,%r11
1507
1508.Lcleanup_load_fpu_regs:
1509	larl	%r9,load_fpu_regs
1510	BR_EX	%r14,%r11
1511
1512/*
1513 * Integer constants
1514 */
1515	.align	8
1516.Lcritical_start:
1517	.quad	.L__critical_start
1518.Lcritical_length:
1519	.quad	.L__critical_end - .L__critical_start
1520#if IS_ENABLED(CONFIG_KVM)
1521.Lsie_critical_start:
1522	.quad	.Lsie_gmap
1523.Lsie_critical_length:
1524	.quad	.Lsie_done - .Lsie_gmap
1525.Lsie_crit_mcck_start:
1526	.quad   .Lsie_entry
1527.Lsie_crit_mcck_length:
1528	.quad   .Lsie_skip - .Lsie_entry
1529#endif
1530	.section .rodata, "a"
1531#define SYSCALL(esame,emu)	.quad __s390x_ ## esame
1532	.globl	sys_call_table
1533sys_call_table:
1534#include "asm/syscall_table.h"
1535#undef SYSCALL
1536
1537#ifdef CONFIG_COMPAT
1538
1539#define SYSCALL(esame,emu)	.quad __s390_ ## emu
1540	.globl	sys_call_table_emu
1541sys_call_table_emu:
1542#include "asm/syscall_table.h"
1543#undef SYSCALL
1544#endif
1545