xref: /openbmc/linux/arch/s390/kernel/entry.S (revision 606aa4aa0b2c6d7c4f5d2e459922675ea1d7e459)
14bfc86ceSHeiko Carstens/*
24bfc86ceSHeiko Carstens *    S390 low-level entry points.
34bfc86ceSHeiko Carstens *
44bfc86ceSHeiko Carstens *    Copyright IBM Corp. 1999, 2012
54bfc86ceSHeiko Carstens *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
64bfc86ceSHeiko Carstens *		 Hartmut Penner (hp@de.ibm.com),
74bfc86ceSHeiko Carstens *		 Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
84bfc86ceSHeiko Carstens *		 Heiko Carstens <heiko.carstens@de.ibm.com>
94bfc86ceSHeiko Carstens */
104bfc86ceSHeiko Carstens
114bfc86ceSHeiko Carstens#include <linux/init.h>
124bfc86ceSHeiko Carstens#include <linux/linkage.h>
134bfc86ceSHeiko Carstens#include <asm/processor.h>
144bfc86ceSHeiko Carstens#include <asm/cache.h>
154bfc86ceSHeiko Carstens#include <asm/errno.h>
164bfc86ceSHeiko Carstens#include <asm/ptrace.h>
174bfc86ceSHeiko Carstens#include <asm/thread_info.h>
184bfc86ceSHeiko Carstens#include <asm/asm-offsets.h>
194bfc86ceSHeiko Carstens#include <asm/unistd.h>
204bfc86ceSHeiko Carstens#include <asm/page.h>
214bfc86ceSHeiko Carstens#include <asm/sigp.h>
224bfc86ceSHeiko Carstens#include <asm/irq.h>
239977e886SHendrik Brueckner#include <asm/vx-insn.h>
2483abeffbSHendrik Brueckner#include <asm/setup.h>
2583abeffbSHendrik Brueckner#include <asm/nmi.h>
26711f5df7SAl Viro#include <asm/export.h>
274bfc86ceSHeiko Carstens
284bfc86ceSHeiko Carstens__PT_R0      =	__PT_GPRS
294bfc86ceSHeiko Carstens__PT_R1      =	__PT_GPRS + 8
304bfc86ceSHeiko Carstens__PT_R2      =	__PT_GPRS + 16
314bfc86ceSHeiko Carstens__PT_R3      =	__PT_GPRS + 24
324bfc86ceSHeiko Carstens__PT_R4      =	__PT_GPRS + 32
334bfc86ceSHeiko Carstens__PT_R5      =	__PT_GPRS + 40
344bfc86ceSHeiko Carstens__PT_R6      =	__PT_GPRS + 48
354bfc86ceSHeiko Carstens__PT_R7      =	__PT_GPRS + 56
364bfc86ceSHeiko Carstens__PT_R8      =	__PT_GPRS + 64
374bfc86ceSHeiko Carstens__PT_R9      =	__PT_GPRS + 72
384bfc86ceSHeiko Carstens__PT_R10     =	__PT_GPRS + 80
394bfc86ceSHeiko Carstens__PT_R11     =	__PT_GPRS + 88
404bfc86ceSHeiko Carstens__PT_R12     =	__PT_GPRS + 96
414bfc86ceSHeiko Carstens__PT_R13     =	__PT_GPRS + 104
424bfc86ceSHeiko Carstens__PT_R14     =	__PT_GPRS + 112
434bfc86ceSHeiko Carstens__PT_R15     =	__PT_GPRS + 120
444bfc86ceSHeiko Carstens
453a890380SHeiko CarstensSTACK_SHIFT = PAGE_SHIFT + THREAD_SIZE_ORDER
464bfc86ceSHeiko CarstensSTACK_SIZE  = 1 << STACK_SHIFT
474bfc86ceSHeiko CarstensSTACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
484bfc86ceSHeiko Carstens
494bfc86ceSHeiko Carstens_TIF_WORK	= (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
504bfc86ceSHeiko Carstens		   _TIF_UPROBE)
514bfc86ceSHeiko Carstens_TIF_TRACE	= (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
524bfc86ceSHeiko Carstens		   _TIF_SYSCALL_TRACEPOINT)
53*606aa4aaSHeiko Carstens_CIF_WORK	= (_CIF_MCCK_PENDING | _CIF_ASCE_PRIMARY | _CIF_FPU)
544bfc86ceSHeiko Carstens_PIF_WORK	= (_PIF_PER_TRAP)
554bfc86ceSHeiko Carstens
569977e886SHendrik Brueckner#define BASED(name) name-cleanup_critical(%r13)
574bfc86ceSHeiko Carstens
584bfc86ceSHeiko Carstens	.macro	TRACE_IRQS_ON
594bfc86ceSHeiko Carstens#ifdef CONFIG_TRACE_IRQFLAGS
604bfc86ceSHeiko Carstens	basr	%r2,%r0
614bfc86ceSHeiko Carstens	brasl	%r14,trace_hardirqs_on_caller
624bfc86ceSHeiko Carstens#endif
634bfc86ceSHeiko Carstens	.endm
644bfc86ceSHeiko Carstens
654bfc86ceSHeiko Carstens	.macro	TRACE_IRQS_OFF
664bfc86ceSHeiko Carstens#ifdef CONFIG_TRACE_IRQFLAGS
674bfc86ceSHeiko Carstens	basr	%r2,%r0
684bfc86ceSHeiko Carstens	brasl	%r14,trace_hardirqs_off_caller
694bfc86ceSHeiko Carstens#endif
704bfc86ceSHeiko Carstens	.endm
714bfc86ceSHeiko Carstens
724bfc86ceSHeiko Carstens	.macro	LOCKDEP_SYS_EXIT
734bfc86ceSHeiko Carstens#ifdef CONFIG_LOCKDEP
744bfc86ceSHeiko Carstens	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
754bfc86ceSHeiko Carstens	jz	.+10
764bfc86ceSHeiko Carstens	brasl	%r14,lockdep_sys_exit
774bfc86ceSHeiko Carstens#endif
784bfc86ceSHeiko Carstens	.endm
794bfc86ceSHeiko Carstens
804bfc86ceSHeiko Carstens	.macro	CHECK_STACK stacksize,savearea
814bfc86ceSHeiko Carstens#ifdef CONFIG_CHECK_STACK
824bfc86ceSHeiko Carstens	tml	%r15,\stacksize - CONFIG_STACK_GUARD
834bfc86ceSHeiko Carstens	lghi	%r14,\savearea
844bfc86ceSHeiko Carstens	jz	stack_overflow
854bfc86ceSHeiko Carstens#endif
864bfc86ceSHeiko Carstens	.endm
874bfc86ceSHeiko Carstens
882acb94f4SMartin Schwidefsky	.macro	SWITCH_ASYNC savearea,timer
894bfc86ceSHeiko Carstens	tmhh	%r8,0x0001		# interrupting from user ?
904bfc86ceSHeiko Carstens	jnz	1f
914bfc86ceSHeiko Carstens	lgr	%r14,%r9
924bfc86ceSHeiko Carstens	slg	%r14,BASED(.Lcritical_start)
934bfc86ceSHeiko Carstens	clg	%r14,BASED(.Lcritical_length)
944bfc86ceSHeiko Carstens	jhe	0f
954bfc86ceSHeiko Carstens	lghi	%r11,\savearea		# inside critical section, do cleanup
964bfc86ceSHeiko Carstens	brasl	%r14,cleanup_critical
974bfc86ceSHeiko Carstens	tmhh	%r8,0x0001		# retest problem state after cleanup
984bfc86ceSHeiko Carstens	jnz	1f
992acb94f4SMartin Schwidefsky0:	lg	%r14,__LC_ASYNC_STACK	# are we already on the async stack?
1004bfc86ceSHeiko Carstens	slgr	%r14,%r15
1012acb94f4SMartin Schwidefsky	srag	%r14,%r14,STACK_SHIFT
102a359bb11SMartin Schwidefsky	jnz	2f
1032acb94f4SMartin Schwidefsky	CHECK_STACK 1<<STACK_SHIFT,\savearea
1044bfc86ceSHeiko Carstens	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
105a359bb11SMartin Schwidefsky	j	3f
10634525e1fSMartin Schwidefsky1:	UPDATE_VTIME %r14,%r15,\timer
1072acb94f4SMartin Schwidefsky2:	lg	%r15,__LC_ASYNC_STACK	# load async stack
108a359bb11SMartin Schwidefsky3:	la	%r11,STACK_FRAME_OVERHEAD(%r15)
1094bfc86ceSHeiko Carstens	.endm
1104bfc86ceSHeiko Carstens
111a359bb11SMartin Schwidefsky	.macro UPDATE_VTIME w1,w2,enter_timer
112a359bb11SMartin Schwidefsky	lg	\w1,__LC_EXIT_TIMER
113a359bb11SMartin Schwidefsky	lg	\w2,__LC_LAST_UPDATE_TIMER
114a359bb11SMartin Schwidefsky	slg	\w1,\enter_timer
115a359bb11SMartin Schwidefsky	slg	\w2,__LC_EXIT_TIMER
116a359bb11SMartin Schwidefsky	alg	\w1,__LC_USER_TIMER
117a359bb11SMartin Schwidefsky	alg	\w2,__LC_SYSTEM_TIMER
118a359bb11SMartin Schwidefsky	stg	\w1,__LC_USER_TIMER
119a359bb11SMartin Schwidefsky	stg	\w2,__LC_SYSTEM_TIMER
1204bfc86ceSHeiko Carstens	mvc	__LC_LAST_UPDATE_TIMER(8),\enter_timer
1214bfc86ceSHeiko Carstens	.endm
1224bfc86ceSHeiko Carstens
1234bfc86ceSHeiko Carstens	.macro REENABLE_IRQS
1244bfc86ceSHeiko Carstens	stg	%r8,__LC_RETURN_PSW
1254bfc86ceSHeiko Carstens	ni	__LC_RETURN_PSW,0xbf
1264bfc86ceSHeiko Carstens	ssm	__LC_RETURN_PSW
1274bfc86ceSHeiko Carstens	.endm
1284bfc86ceSHeiko Carstens
1294bfc86ceSHeiko Carstens	.macro STCK savearea
1304bfc86ceSHeiko Carstens#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
1314bfc86ceSHeiko Carstens	.insn	s,0xb27c0000,\savearea		# store clock fast
1324bfc86ceSHeiko Carstens#else
1334bfc86ceSHeiko Carstens	.insn	s,0xb2050000,\savearea		# store clock
1344bfc86ceSHeiko Carstens#endif
1354bfc86ceSHeiko Carstens	.endm
1364bfc86ceSHeiko Carstens
13783abeffbSHendrik Brueckner	/*
13883abeffbSHendrik Brueckner	 * The TSTMSK macro generates a test-under-mask instruction by
13983abeffbSHendrik Brueckner	 * calculating the memory offset for the specified mask value.
14083abeffbSHendrik Brueckner	 * Mask value can be any constant.  The macro shifts the mask
14183abeffbSHendrik Brueckner	 * value to calculate the memory offset for the test-under-mask
14283abeffbSHendrik Brueckner	 * instruction.
14383abeffbSHendrik Brueckner	 */
14483abeffbSHendrik Brueckner	.macro TSTMSK addr, mask, size=8, bytepos=0
14583abeffbSHendrik Brueckner		.if (\bytepos < \size) && (\mask >> 8)
14683abeffbSHendrik Brueckner			.if (\mask & 0xff)
14783abeffbSHendrik Brueckner				.error "Mask exceeds byte boundary"
14883abeffbSHendrik Brueckner			.endif
14983abeffbSHendrik Brueckner			TSTMSK \addr, "(\mask >> 8)", \size, "(\bytepos + 1)"
15083abeffbSHendrik Brueckner			.exitm
15183abeffbSHendrik Brueckner		.endif
15283abeffbSHendrik Brueckner		.ifeq \mask
15383abeffbSHendrik Brueckner			.error "Mask must not be zero"
15483abeffbSHendrik Brueckner		.endif
15583abeffbSHendrik Brueckner		off = \size - \bytepos - 1
15683abeffbSHendrik Brueckner		tm	off+\addr, \mask
15783abeffbSHendrik Brueckner	.endm
15883abeffbSHendrik Brueckner
1594bfc86ceSHeiko Carstens	.section .kprobes.text, "ax"
16046210c44SHeiko Carstens.Ldummy:
16146210c44SHeiko Carstens	/*
16246210c44SHeiko Carstens	 * This nop exists only in order to avoid that __switch_to starts at
16346210c44SHeiko Carstens	 * the beginning of the kprobes text section. In that case we would
16446210c44SHeiko Carstens	 * have several symbols at the same address. E.g. objdump would take
16546210c44SHeiko Carstens	 * an arbitrary symbol name when disassembling this code.
16646210c44SHeiko Carstens	 * With the added nop in between the __switch_to symbol is unique
16746210c44SHeiko Carstens	 * again.
16846210c44SHeiko Carstens	 */
16946210c44SHeiko Carstens	nop	0
1704bfc86ceSHeiko Carstens
1714bfc86ceSHeiko Carstens/*
1724bfc86ceSHeiko Carstens * Scheduler resume function, called by switch_to
1734bfc86ceSHeiko Carstens *  gpr2 = (task_struct *) prev
1744bfc86ceSHeiko Carstens *  gpr3 = (task_struct *) next
1754bfc86ceSHeiko Carstens * Returns:
1764bfc86ceSHeiko Carstens *  gpr2 = prev
1774bfc86ceSHeiko Carstens */
1784bfc86ceSHeiko CarstensENTRY(__switch_to)
1794bfc86ceSHeiko Carstens	stmg	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
1803827ec3dSMartin Schwidefsky	lgr	%r1,%r2
1813827ec3dSMartin Schwidefsky	aghi	%r1,__TASK_thread		# thread_struct of prev task
182d5c352cdSHeiko Carstens	lg	%r5,__TASK_stack(%r3)		# start of kernel stack of next
1833827ec3dSMartin Schwidefsky	stg	%r15,__THREAD_ksp(%r1)		# store kernel stack of prev
1843827ec3dSMartin Schwidefsky	lgr	%r1,%r3
1853827ec3dSMartin Schwidefsky	aghi	%r1,__TASK_thread		# thread_struct of next task
1864bfc86ceSHeiko Carstens	lgr	%r15,%r5
1874bfc86ceSHeiko Carstens	aghi	%r15,STACK_INIT			# end of kernel stack of next
1884bfc86ceSHeiko Carstens	stg	%r3,__LC_CURRENT		# store task struct of next
1894bfc86ceSHeiko Carstens	stg	%r15,__LC_KERNEL_STACK		# store end of kernel stack
1903827ec3dSMartin Schwidefsky	lg	%r15,__THREAD_ksp(%r1)		# load kernel stack of next
191b1685ab9SChristian Borntraeger	/* c4 is used in guest detection: arch/s390/kernel/perf_cpum_sf.c */
1924bfc86ceSHeiko Carstens	lctl	%c4,%c4,__TASK_pid(%r3)		# load pid to control reg. 4
193e22cf8caSChristian Borntraeger	mvc	__LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next
1944bfc86ceSHeiko Carstens	lmg	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
195e22cf8caSChristian Borntraeger	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
196e22cf8caSChristian Borntraeger	bzr	%r14
197e22cf8caSChristian Borntraeger	.insn	s,0xb2800000,__LC_LPP		# set program parameter
1984bfc86ceSHeiko Carstens	br	%r14
1994bfc86ceSHeiko Carstens
2004bfc86ceSHeiko Carstens.L__critical_start:
201d0fc4107SMartin Schwidefsky
202d0fc4107SMartin Schwidefsky#if IS_ENABLED(CONFIG_KVM)
203d0fc4107SMartin Schwidefsky/*
204d0fc4107SMartin Schwidefsky * sie64a calling convention:
205d0fc4107SMartin Schwidefsky * %r2 pointer to sie control block
206d0fc4107SMartin Schwidefsky * %r3 guest register save area
207d0fc4107SMartin Schwidefsky */
208d0fc4107SMartin SchwidefskyENTRY(sie64a)
209d0fc4107SMartin Schwidefsky	stmg	%r6,%r14,__SF_GPRS(%r15)	# save kernel registers
210d0fc4107SMartin Schwidefsky	stg	%r2,__SF_EMPTY(%r15)		# save control block pointer
211d0fc4107SMartin Schwidefsky	stg	%r3,__SF_EMPTY+8(%r15)		# save guest register save area
212e22cf8caSChristian Borntraeger	xc	__SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # reason code = 0
21383abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU		# load guest fp/vx registers ?
214d0fc4107SMartin Schwidefsky	jno	.Lsie_load_guest_gprs
215d0fc4107SMartin Schwidefsky	brasl	%r14,load_fpu_regs		# load guest fp/vx regs
216d0fc4107SMartin Schwidefsky.Lsie_load_guest_gprs:
217d0fc4107SMartin Schwidefsky	lmg	%r0,%r13,0(%r3)			# load guest gprs 0-13
218d0fc4107SMartin Schwidefsky	lg	%r14,__LC_GMAP			# get gmap pointer
219d0fc4107SMartin Schwidefsky	ltgr	%r14,%r14
220d0fc4107SMartin Schwidefsky	jz	.Lsie_gmap
221d0fc4107SMartin Schwidefsky	lctlg	%c1,%c1,__GMAP_ASCE(%r14)	# load primary asce
222d0fc4107SMartin Schwidefsky.Lsie_gmap:
223d0fc4107SMartin Schwidefsky	lg	%r14,__SF_EMPTY(%r15)		# get control block pointer
224d0fc4107SMartin Schwidefsky	oi	__SIE_PROG0C+3(%r14),1		# we are going into SIE now
225d0fc4107SMartin Schwidefsky	tm	__SIE_PROG20+3(%r14),3		# last exit...
226d0fc4107SMartin Schwidefsky	jnz	.Lsie_skip
22783abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
228d0fc4107SMartin Schwidefsky	jo	.Lsie_skip			# exit if fp/vx regs changed
229d0fc4107SMartin Schwidefsky	sie	0(%r14)
230d0fc4107SMartin Schwidefsky.Lsie_skip:
231d0fc4107SMartin Schwidefsky	ni	__SIE_PROG0C+3(%r14),0xfe	# no longer in SIE
232d0fc4107SMartin Schwidefsky	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
233d0fc4107SMartin Schwidefsky.Lsie_done:
234d0fc4107SMartin Schwidefsky# some program checks are suppressing. C code (e.g. do_protection_exception)
235d0fc4107SMartin Schwidefsky# will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other
236d0fc4107SMartin Schwidefsky# instructions between sie64a and .Lsie_done should not cause program
237d0fc4107SMartin Schwidefsky# interrupts. So lets use a nop (47 00 00 00) as a landing pad.
238d0fc4107SMartin Schwidefsky# See also .Lcleanup_sie
239d0fc4107SMartin Schwidefsky.Lrewind_pad:
240d0fc4107SMartin Schwidefsky	nop	0
241d0fc4107SMartin Schwidefsky	.globl sie_exit
242d0fc4107SMartin Schwidefskysie_exit:
243d0fc4107SMartin Schwidefsky	lg	%r14,__SF_EMPTY+8(%r15)		# load guest register save area
244d0fc4107SMartin Schwidefsky	stmg	%r0,%r13,0(%r14)		# save guest gprs 0-13
245d0fc4107SMartin Schwidefsky	lmg	%r6,%r14,__SF_GPRS(%r15)	# restore kernel registers
246e22cf8caSChristian Borntraeger	lg	%r2,__SF_EMPTY+16(%r15)		# return exit reason code
247d0fc4107SMartin Schwidefsky	br	%r14
248d0fc4107SMartin Schwidefsky.Lsie_fault:
249d0fc4107SMartin Schwidefsky	lghi	%r14,-EFAULT
250e22cf8caSChristian Borntraeger	stg	%r14,__SF_EMPTY+16(%r15)	# set exit reason code
251d0fc4107SMartin Schwidefsky	j	sie_exit
252d0fc4107SMartin Schwidefsky
253d0fc4107SMartin Schwidefsky	EX_TABLE(.Lrewind_pad,.Lsie_fault)
254d0fc4107SMartin Schwidefsky	EX_TABLE(sie_exit,.Lsie_fault)
255711f5df7SAl ViroEXPORT_SYMBOL(sie64a)
256711f5df7SAl ViroEXPORT_SYMBOL(sie_exit)
257d0fc4107SMartin Schwidefsky#endif
258d0fc4107SMartin Schwidefsky
2594bfc86ceSHeiko Carstens/*
2604bfc86ceSHeiko Carstens * SVC interrupt handler routine. System calls are synchronous events and
2614bfc86ceSHeiko Carstens * are executed with interrupts enabled.
2624bfc86ceSHeiko Carstens */
2634bfc86ceSHeiko Carstens
2644bfc86ceSHeiko CarstensENTRY(system_call)
2654bfc86ceSHeiko Carstens	stpt	__LC_SYNC_ENTER_TIMER
2664bfc86ceSHeiko Carstens.Lsysc_stmg:
2674bfc86ceSHeiko Carstens	stmg	%r8,%r15,__LC_SAVE_AREA_SYNC
268d5c352cdSHeiko Carstens	lg	%r12,__LC_CURRENT
26934525e1fSMartin Schwidefsky	lghi	%r13,__TASK_thread
2704bfc86ceSHeiko Carstens	lghi	%r14,_PIF_SYSCALL
2714bfc86ceSHeiko Carstens.Lsysc_per:
2724bfc86ceSHeiko Carstens	lg	%r15,__LC_KERNEL_STACK
2734bfc86ceSHeiko Carstens	la	%r11,STACK_FRAME_OVERHEAD(%r15)	# pointer to pt_regs
274a359bb11SMartin Schwidefsky.Lsysc_vtime:
27534525e1fSMartin Schwidefsky	UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER
2764bfc86ceSHeiko Carstens	stmg	%r0,%r7,__PT_R0(%r11)
2774bfc86ceSHeiko Carstens	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
2784bfc86ceSHeiko Carstens	mvc	__PT_PSW(16,%r11),__LC_SVC_OLD_PSW
2794bfc86ceSHeiko Carstens	mvc	__PT_INT_CODE(4,%r11),__LC_SVC_ILC
2804bfc86ceSHeiko Carstens	stg	%r14,__PT_FLAGS(%r11)
2814bfc86ceSHeiko Carstens.Lsysc_do_svc:
282ef280c85SMartin Schwidefsky	# load address of system call table
283ef280c85SMartin Schwidefsky	lg	%r10,__THREAD_sysc_table(%r13,%r12)
2844bfc86ceSHeiko Carstens	llgh	%r8,__PT_INT_CODE+2(%r11)
2854bfc86ceSHeiko Carstens	slag	%r8,%r8,2			# shift and test for svc 0
2864bfc86ceSHeiko Carstens	jnz	.Lsysc_nr_ok
2874bfc86ceSHeiko Carstens	# svc 0: system call number in %r1
2884bfc86ceSHeiko Carstens	llgfr	%r1,%r1				# clear high word in r1
2894bfc86ceSHeiko Carstens	cghi	%r1,NR_syscalls
2904bfc86ceSHeiko Carstens	jnl	.Lsysc_nr_ok
2914bfc86ceSHeiko Carstens	sth	%r1,__PT_INT_CODE+2(%r11)
2924bfc86ceSHeiko Carstens	slag	%r8,%r1,2
2934bfc86ceSHeiko Carstens.Lsysc_nr_ok:
2944bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
2954bfc86ceSHeiko Carstens	stg	%r2,__PT_ORIG_GPR2(%r11)
2964bfc86ceSHeiko Carstens	stg	%r7,STACK_FRAME_OVERHEAD(%r15)
2974bfc86ceSHeiko Carstens	lgf	%r9,0(%r8,%r10)			# get system call add.
29883abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_TRACE
2994bfc86ceSHeiko Carstens	jnz	.Lsysc_tracesys
3004bfc86ceSHeiko Carstens	basr	%r14,%r9			# call sys_xxxx
3014bfc86ceSHeiko Carstens	stg	%r2,__PT_R2(%r11)		# store return value
3024bfc86ceSHeiko Carstens
3034bfc86ceSHeiko Carstens.Lsysc_return:
3044bfc86ceSHeiko Carstens	LOCKDEP_SYS_EXIT
3054bfc86ceSHeiko Carstens.Lsysc_tif:
30683abeffbSHendrik Brueckner	TSTMSK	__PT_FLAGS(%r11),_PIF_WORK
3074bfc86ceSHeiko Carstens	jnz	.Lsysc_work
30883abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_WORK
3094bfc86ceSHeiko Carstens	jnz	.Lsysc_work			# check for work
31083abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_WORK
3114bfc86ceSHeiko Carstens	jnz	.Lsysc_work
3124bfc86ceSHeiko Carstens.Lsysc_restore:
3134bfc86ceSHeiko Carstens	lg	%r14,__LC_VDSO_PER_CPU
3144bfc86ceSHeiko Carstens	lmg	%r0,%r10,__PT_R0(%r11)
3154bfc86ceSHeiko Carstens	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r11)
3164bfc86ceSHeiko Carstens	stpt	__LC_EXIT_TIMER
3174bfc86ceSHeiko Carstens	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
3184bfc86ceSHeiko Carstens	lmg	%r11,%r15,__PT_R11(%r11)
3194bfc86ceSHeiko Carstens	lpswe	__LC_RETURN_PSW
3204bfc86ceSHeiko Carstens.Lsysc_done:
3214bfc86ceSHeiko Carstens
3224bfc86ceSHeiko Carstens#
3234bfc86ceSHeiko Carstens# One of the work bits is on. Find out which one.
3244bfc86ceSHeiko Carstens#
3254bfc86ceSHeiko Carstens.Lsysc_work:
32683abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
3274bfc86ceSHeiko Carstens	jo	.Lsysc_mcck_pending
32883abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_NEED_RESCHED
3294bfc86ceSHeiko Carstens	jo	.Lsysc_reschedule
3304bfc86ceSHeiko Carstens#ifdef CONFIG_UPROBES
33183abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_UPROBE
3324bfc86ceSHeiko Carstens	jo	.Lsysc_uprobe_notify
3334bfc86ceSHeiko Carstens#endif
33483abeffbSHendrik Brueckner	TSTMSK	__PT_FLAGS(%r11),_PIF_PER_TRAP
3354bfc86ceSHeiko Carstens	jo	.Lsysc_singlestep
33683abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_SIGPENDING
3374bfc86ceSHeiko Carstens	jo	.Lsysc_sigpending
33883abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_RESUME
3394bfc86ceSHeiko Carstens	jo	.Lsysc_notify_resume
34083abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
3419977e886SHendrik Brueckner	jo	.Lsysc_vxrs
342*606aa4aaSHeiko Carstens	TSTMSK	__LC_CPU_FLAGS,_CIF_ASCE_PRIMARY
343*606aa4aaSHeiko Carstens	jo	.Lsysc_asce_primary
3444bfc86ceSHeiko Carstens	j	.Lsysc_return		# beware of critical section cleanup
3454bfc86ceSHeiko Carstens
3464bfc86ceSHeiko Carstens#
3474bfc86ceSHeiko Carstens# _TIF_NEED_RESCHED is set, call schedule
3484bfc86ceSHeiko Carstens#
3494bfc86ceSHeiko Carstens.Lsysc_reschedule:
3504bfc86ceSHeiko Carstens	larl	%r14,.Lsysc_return
3514bfc86ceSHeiko Carstens	jg	schedule
3524bfc86ceSHeiko Carstens
3534bfc86ceSHeiko Carstens#
3544bfc86ceSHeiko Carstens# _CIF_MCCK_PENDING is set, call handler
3554bfc86ceSHeiko Carstens#
3564bfc86ceSHeiko Carstens.Lsysc_mcck_pending:
3574bfc86ceSHeiko Carstens	larl	%r14,.Lsysc_return
3584bfc86ceSHeiko Carstens	jg	s390_handle_mcck	# TIF bit will be cleared by handler
3594bfc86ceSHeiko Carstens
3604bfc86ceSHeiko Carstens#
361*606aa4aaSHeiko Carstens# _CIF_ASCE_PRIMARY is set, load user space asce
3624bfc86ceSHeiko Carstens#
363*606aa4aaSHeiko Carstens.Lsysc_asce_primary:
364*606aa4aaSHeiko Carstens	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
3654bfc86ceSHeiko Carstens	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
3664bfc86ceSHeiko Carstens	j	.Lsysc_return
3674bfc86ceSHeiko Carstens
3684bfc86ceSHeiko Carstens#
3699977e886SHendrik Brueckner# CIF_FPU is set, restore floating-point controls and floating-point registers.
3709977e886SHendrik Brueckner#
3719977e886SHendrik Brueckner.Lsysc_vxrs:
3729977e886SHendrik Brueckner	larl	%r14,.Lsysc_return
3739977e886SHendrik Brueckner	jg	load_fpu_regs
3749977e886SHendrik Brueckner
3759977e886SHendrik Brueckner#
3764bfc86ceSHeiko Carstens# _TIF_SIGPENDING is set, call do_signal
3774bfc86ceSHeiko Carstens#
3784bfc86ceSHeiko Carstens.Lsysc_sigpending:
3794bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
3804bfc86ceSHeiko Carstens	brasl	%r14,do_signal
38183abeffbSHendrik Brueckner	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL
3824bfc86ceSHeiko Carstens	jno	.Lsysc_return
38357d7f939SMartin Schwidefsky.Lsysc_do_syscall:
38457d7f939SMartin Schwidefsky	lghi	%r13,__TASK_thread
3854bfc86ceSHeiko Carstens	lmg	%r2,%r7,__PT_R2(%r11)	# load svc arguments
38657d7f939SMartin Schwidefsky	lghi	%r1,0			# svc 0 returns -ENOSYS
38757d7f939SMartin Schwidefsky	j	.Lsysc_do_svc
3884bfc86ceSHeiko Carstens
3894bfc86ceSHeiko Carstens#
3904bfc86ceSHeiko Carstens# _TIF_NOTIFY_RESUME is set, call do_notify_resume
3914bfc86ceSHeiko Carstens#
3924bfc86ceSHeiko Carstens.Lsysc_notify_resume:
3934bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
3944bfc86ceSHeiko Carstens	larl	%r14,.Lsysc_return
3954bfc86ceSHeiko Carstens	jg	do_notify_resume
3964bfc86ceSHeiko Carstens
3974bfc86ceSHeiko Carstens#
3984bfc86ceSHeiko Carstens# _TIF_UPROBE is set, call uprobe_notify_resume
3994bfc86ceSHeiko Carstens#
4004bfc86ceSHeiko Carstens#ifdef CONFIG_UPROBES
4014bfc86ceSHeiko Carstens.Lsysc_uprobe_notify:
4024bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
4034bfc86ceSHeiko Carstens	larl	%r14,.Lsysc_return
4044bfc86ceSHeiko Carstens	jg	uprobe_notify_resume
4054bfc86ceSHeiko Carstens#endif
4064bfc86ceSHeiko Carstens
4074bfc86ceSHeiko Carstens#
4084bfc86ceSHeiko Carstens# _PIF_PER_TRAP is set, call do_per_trap
4094bfc86ceSHeiko Carstens#
4104bfc86ceSHeiko Carstens.Lsysc_singlestep:
4114bfc86ceSHeiko Carstens	ni	__PT_FLAGS+7(%r11),255-_PIF_PER_TRAP
4124bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
4134bfc86ceSHeiko Carstens	larl	%r14,.Lsysc_return
4144bfc86ceSHeiko Carstens	jg	do_per_trap
4154bfc86ceSHeiko Carstens
4164bfc86ceSHeiko Carstens#
4174bfc86ceSHeiko Carstens# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
4184bfc86ceSHeiko Carstens# and after the system call
4194bfc86ceSHeiko Carstens#
4204bfc86ceSHeiko Carstens.Lsysc_tracesys:
4214bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
4224bfc86ceSHeiko Carstens	la	%r3,0
4234bfc86ceSHeiko Carstens	llgh	%r0,__PT_INT_CODE+2(%r11)
4244bfc86ceSHeiko Carstens	stg	%r0,__PT_R2(%r11)
4254bfc86ceSHeiko Carstens	brasl	%r14,do_syscall_trace_enter
4264bfc86ceSHeiko Carstens	lghi	%r0,NR_syscalls
4274bfc86ceSHeiko Carstens	clgr	%r0,%r2
4284bfc86ceSHeiko Carstens	jnh	.Lsysc_tracenogo
4294bfc86ceSHeiko Carstens	sllg	%r8,%r2,2
4304bfc86ceSHeiko Carstens	lgf	%r9,0(%r8,%r10)
4314bfc86ceSHeiko Carstens.Lsysc_tracego:
4324bfc86ceSHeiko Carstens	lmg	%r3,%r7,__PT_R3(%r11)
4334bfc86ceSHeiko Carstens	stg	%r7,STACK_FRAME_OVERHEAD(%r15)
4344bfc86ceSHeiko Carstens	lg	%r2,__PT_ORIG_GPR2(%r11)
4354bfc86ceSHeiko Carstens	basr	%r14,%r9		# call sys_xxx
4364bfc86ceSHeiko Carstens	stg	%r2,__PT_R2(%r11)	# store return value
4374bfc86ceSHeiko Carstens.Lsysc_tracenogo:
43883abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_TRACE
4394bfc86ceSHeiko Carstens	jz	.Lsysc_return
4404bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
4414bfc86ceSHeiko Carstens	larl	%r14,.Lsysc_return
4424bfc86ceSHeiko Carstens	jg	do_syscall_trace_exit
4434bfc86ceSHeiko Carstens
4444bfc86ceSHeiko Carstens#
4454bfc86ceSHeiko Carstens# a new process exits the kernel with ret_from_fork
4464bfc86ceSHeiko Carstens#
4474bfc86ceSHeiko CarstensENTRY(ret_from_fork)
4484bfc86ceSHeiko Carstens	la	%r11,STACK_FRAME_OVERHEAD(%r15)
449d5c352cdSHeiko Carstens	lg	%r12,__LC_CURRENT
4504bfc86ceSHeiko Carstens	brasl	%r14,schedule_tail
4514bfc86ceSHeiko Carstens	TRACE_IRQS_ON
4524bfc86ceSHeiko Carstens	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
4534bfc86ceSHeiko Carstens	tm	__PT_PSW+1(%r11),0x01	# forking a kernel thread ?
4544bfc86ceSHeiko Carstens	jne	.Lsysc_tracenogo
4554bfc86ceSHeiko Carstens	# it's a kernel thread
4564bfc86ceSHeiko Carstens	lmg	%r9,%r10,__PT_R9(%r11)	# load gprs
4574bfc86ceSHeiko CarstensENTRY(kernel_thread_starter)
4584bfc86ceSHeiko Carstens	la	%r2,0(%r10)
4594bfc86ceSHeiko Carstens	basr	%r14,%r9
4604bfc86ceSHeiko Carstens	j	.Lsysc_tracenogo
4614bfc86ceSHeiko Carstens
4624bfc86ceSHeiko Carstens/*
4634bfc86ceSHeiko Carstens * Program check handler routine
4644bfc86ceSHeiko Carstens */
4654bfc86ceSHeiko Carstens
4664bfc86ceSHeiko CarstensENTRY(pgm_check_handler)
4674bfc86ceSHeiko Carstens	stpt	__LC_SYNC_ENTER_TIMER
4684bfc86ceSHeiko Carstens	stmg	%r8,%r15,__LC_SAVE_AREA_SYNC
4694bfc86ceSHeiko Carstens	lg	%r10,__LC_LAST_BREAK
470d5c352cdSHeiko Carstens	lg	%r12,__LC_CURRENT
4719977e886SHendrik Brueckner	larl	%r13,cleanup_critical
4724bfc86ceSHeiko Carstens	lmg	%r8,%r9,__LC_PGM_OLD_PSW
4734bfc86ceSHeiko Carstens	tmhh	%r8,0x0001		# test problem state bit
474d0fc4107SMartin Schwidefsky	jnz	2f			# -> fault in user space
475d0fc4107SMartin Schwidefsky#if IS_ENABLED(CONFIG_KVM)
476d0fc4107SMartin Schwidefsky	# cleanup critical section for sie64a
477d0fc4107SMartin Schwidefsky	lgr	%r14,%r9
478d0fc4107SMartin Schwidefsky	slg	%r14,BASED(.Lsie_critical_start)
479d0fc4107SMartin Schwidefsky	clg	%r14,BASED(.Lsie_critical_length)
480d0fc4107SMartin Schwidefsky	jhe	0f
481d0fc4107SMartin Schwidefsky	brasl	%r14,.Lcleanup_sie
482d0fc4107SMartin Schwidefsky#endif
483d0fc4107SMartin Schwidefsky0:	tmhh	%r8,0x4000		# PER bit set in old PSW ?
484d0fc4107SMartin Schwidefsky	jnz	1f			# -> enabled, can't be a double fault
4854bfc86ceSHeiko Carstens	tm	__LC_PGM_ILC+3,0x80	# check for per exception
4864bfc86ceSHeiko Carstens	jnz	.Lpgm_svcper		# -> single stepped svc
487d0fc4107SMartin Schwidefsky1:	CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
4884bfc86ceSHeiko Carstens	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
489d0fc4107SMartin Schwidefsky	j	3f
49034525e1fSMartin Schwidefsky2:	UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER
4914bfc86ceSHeiko Carstens	lg	%r15,__LC_KERNEL_STACK
492d5c352cdSHeiko Carstens	lgr	%r14,%r12
4933827ec3dSMartin Schwidefsky	aghi	%r14,__TASK_thread	# pointer to thread_struct
4944bfc86ceSHeiko Carstens	lghi	%r13,__LC_PGM_TDB
4954bfc86ceSHeiko Carstens	tm	__LC_PGM_ILC+2,0x02	# check for transaction abort
496d0fc4107SMartin Schwidefsky	jz	3f
4974bfc86ceSHeiko Carstens	mvc	__THREAD_trap_tdb(256,%r14),0(%r13)
498d0fc4107SMartin Schwidefsky3:	la	%r11,STACK_FRAME_OVERHEAD(%r15)
49934525e1fSMartin Schwidefsky	stg	%r10,__THREAD_last_break(%r14)
5004bfc86ceSHeiko Carstens	stmg	%r0,%r7,__PT_R0(%r11)
5014bfc86ceSHeiko Carstens	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
5024bfc86ceSHeiko Carstens	stmg	%r8,%r9,__PT_PSW(%r11)
5034bfc86ceSHeiko Carstens	mvc	__PT_INT_CODE(4,%r11),__LC_PGM_ILC
5044bfc86ceSHeiko Carstens	mvc	__PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
5054bfc86ceSHeiko Carstens	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
5064bfc86ceSHeiko Carstens	stg	%r10,__PT_ARGS(%r11)
5074bfc86ceSHeiko Carstens	tm	__LC_PGM_ILC+3,0x80	# check for per exception
508d0fc4107SMartin Schwidefsky	jz	4f
5094bfc86ceSHeiko Carstens	tmhh	%r8,0x0001		# kernel per event ?
5104bfc86ceSHeiko Carstens	jz	.Lpgm_kprobe
5114bfc86ceSHeiko Carstens	oi	__PT_FLAGS+7(%r11),_PIF_PER_TRAP
5124bfc86ceSHeiko Carstens	mvc	__THREAD_per_address(8,%r14),__LC_PER_ADDRESS
5134bfc86ceSHeiko Carstens	mvc	__THREAD_per_cause(2,%r14),__LC_PER_CODE
5144bfc86ceSHeiko Carstens	mvc	__THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID
515d0fc4107SMartin Schwidefsky4:	REENABLE_IRQS
5164bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
5174bfc86ceSHeiko Carstens	larl	%r1,pgm_check_table
5184bfc86ceSHeiko Carstens	llgh	%r10,__PT_INT_CODE+2(%r11)
5194bfc86ceSHeiko Carstens	nill	%r10,0x007f
5204bfc86ceSHeiko Carstens	sll	%r10,2
521a359bb11SMartin Schwidefsky	je	.Lpgm_return
5224bfc86ceSHeiko Carstens	lgf	%r1,0(%r10,%r1)		# load address of handler routine
5234bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
5244bfc86ceSHeiko Carstens	basr	%r14,%r1		# branch to interrupt-handler
525a359bb11SMartin Schwidefsky.Lpgm_return:
526a359bb11SMartin Schwidefsky	LOCKDEP_SYS_EXIT
527a359bb11SMartin Schwidefsky	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
528a359bb11SMartin Schwidefsky	jno	.Lsysc_restore
52957d7f939SMartin Schwidefsky	TSTMSK	__PT_FLAGS(%r11),_PIF_SYSCALL
53057d7f939SMartin Schwidefsky	jo	.Lsysc_do_syscall
531a359bb11SMartin Schwidefsky	j	.Lsysc_tif
5324bfc86ceSHeiko Carstens
5334bfc86ceSHeiko Carstens#
5344bfc86ceSHeiko Carstens# PER event in supervisor state, must be kprobes
5354bfc86ceSHeiko Carstens#
5364bfc86ceSHeiko Carstens.Lpgm_kprobe:
5374bfc86ceSHeiko Carstens	REENABLE_IRQS
5384bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
5394bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
5404bfc86ceSHeiko Carstens	brasl	%r14,do_per_trap
541a359bb11SMartin Schwidefsky	j	.Lpgm_return
5424bfc86ceSHeiko Carstens
5434bfc86ceSHeiko Carstens#
5444bfc86ceSHeiko Carstens# single stepped system call
5454bfc86ceSHeiko Carstens#
5464bfc86ceSHeiko Carstens.Lpgm_svcper:
5474bfc86ceSHeiko Carstens	mvc	__LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
548d24b98e3SMartin Schwidefsky	lghi	%r13,__TASK_thread
5494bfc86ceSHeiko Carstens	larl	%r14,.Lsysc_per
5504bfc86ceSHeiko Carstens	stg	%r14,__LC_RETURN_PSW+8
5514bfc86ceSHeiko Carstens	lghi	%r14,_PIF_SYSCALL | _PIF_PER_TRAP
5524bfc86ceSHeiko Carstens	lpswe	__LC_RETURN_PSW		# branch to .Lsysc_per and enable irqs
5534bfc86ceSHeiko Carstens
5544bfc86ceSHeiko Carstens/*
5554bfc86ceSHeiko Carstens * IO interrupt handler routine
5564bfc86ceSHeiko Carstens */
5574bfc86ceSHeiko CarstensENTRY(io_int_handler)
5584bfc86ceSHeiko Carstens	STCK	__LC_INT_CLOCK
5594bfc86ceSHeiko Carstens	stpt	__LC_ASYNC_ENTER_TIMER
5604bfc86ceSHeiko Carstens	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
561d5c352cdSHeiko Carstens	lg	%r12,__LC_CURRENT
5629977e886SHendrik Brueckner	larl	%r13,cleanup_critical
5634bfc86ceSHeiko Carstens	lmg	%r8,%r9,__LC_IO_OLD_PSW
5642acb94f4SMartin Schwidefsky	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
5654bfc86ceSHeiko Carstens	stmg	%r0,%r7,__PT_R0(%r11)
5664bfc86ceSHeiko Carstens	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
5674bfc86ceSHeiko Carstens	stmg	%r8,%r9,__PT_PSW(%r11)
5684bfc86ceSHeiko Carstens	mvc	__PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
5694bfc86ceSHeiko Carstens	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
570db7e007fSHeiko Carstens	TSTMSK	__LC_CPU_FLAGS,_CIF_IGNORE_IRQ
571db7e007fSHeiko Carstens	jo	.Lio_restore
5724bfc86ceSHeiko Carstens	TRACE_IRQS_OFF
5734bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
5744bfc86ceSHeiko Carstens.Lio_loop:
5754bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
5764bfc86ceSHeiko Carstens	lghi	%r3,IO_INTERRUPT
5774bfc86ceSHeiko Carstens	tm	__PT_INT_CODE+8(%r11),0x80	# adapter interrupt ?
5784bfc86ceSHeiko Carstens	jz	.Lio_call
5794bfc86ceSHeiko Carstens	lghi	%r3,THIN_INTERRUPT
5804bfc86ceSHeiko Carstens.Lio_call:
5814bfc86ceSHeiko Carstens	brasl	%r14,do_IRQ
58283abeffbSHendrik Brueckner	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_LPAR
5834bfc86ceSHeiko Carstens	jz	.Lio_return
5844bfc86ceSHeiko Carstens	tpi	0
5854bfc86ceSHeiko Carstens	jz	.Lio_return
5864bfc86ceSHeiko Carstens	mvc	__PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
5874bfc86ceSHeiko Carstens	j	.Lio_loop
5884bfc86ceSHeiko Carstens.Lio_return:
5894bfc86ceSHeiko Carstens	LOCKDEP_SYS_EXIT
5904bfc86ceSHeiko Carstens	TRACE_IRQS_ON
5914bfc86ceSHeiko Carstens.Lio_tif:
59283abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_WORK
5934bfc86ceSHeiko Carstens	jnz	.Lio_work		# there is work to do (signals etc.)
59483abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_WORK
5954bfc86ceSHeiko Carstens	jnz	.Lio_work
5964bfc86ceSHeiko Carstens.Lio_restore:
5974bfc86ceSHeiko Carstens	lg	%r14,__LC_VDSO_PER_CPU
5984bfc86ceSHeiko Carstens	lmg	%r0,%r10,__PT_R0(%r11)
5994bfc86ceSHeiko Carstens	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r11)
6004bfc86ceSHeiko Carstens	stpt	__LC_EXIT_TIMER
6014bfc86ceSHeiko Carstens	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
6024bfc86ceSHeiko Carstens	lmg	%r11,%r15,__PT_R11(%r11)
6034bfc86ceSHeiko Carstens	lpswe	__LC_RETURN_PSW
6044bfc86ceSHeiko Carstens.Lio_done:
6054bfc86ceSHeiko Carstens
6064bfc86ceSHeiko Carstens#
6074bfc86ceSHeiko Carstens# There is work todo, find out in which context we have been interrupted:
6084bfc86ceSHeiko Carstens# 1) if we return to user space we can do all _TIF_WORK work
6094bfc86ceSHeiko Carstens# 2) if we return to kernel code and kvm is enabled check if we need to
6104bfc86ceSHeiko Carstens#    modify the psw to leave SIE
6114bfc86ceSHeiko Carstens# 3) if we return to kernel code and preemptive scheduling is enabled check
6124bfc86ceSHeiko Carstens#    the preemption counter and if it is zero call preempt_schedule_irq
6134bfc86ceSHeiko Carstens# Before any work can be done, a switch to the kernel stack is required.
6144bfc86ceSHeiko Carstens#
6154bfc86ceSHeiko Carstens.Lio_work:
6164bfc86ceSHeiko Carstens	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
6174bfc86ceSHeiko Carstens	jo	.Lio_work_user		# yes -> do resched & signal
6184bfc86ceSHeiko Carstens#ifdef CONFIG_PREEMPT
6194bfc86ceSHeiko Carstens	# check for preemptive scheduling
620c360192bSMartin Schwidefsky	icm	%r0,15,__LC_PREEMPT_COUNT
6214bfc86ceSHeiko Carstens	jnz	.Lio_restore		# preemption is disabled
62283abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_NEED_RESCHED
6234bfc86ceSHeiko Carstens	jno	.Lio_restore
6244bfc86ceSHeiko Carstens	# switch to kernel stack
6254bfc86ceSHeiko Carstens	lg	%r1,__PT_R15(%r11)
6264bfc86ceSHeiko Carstens	aghi	%r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
6274bfc86ceSHeiko Carstens	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
6284bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
6294bfc86ceSHeiko Carstens	la	%r11,STACK_FRAME_OVERHEAD(%r1)
6304bfc86ceSHeiko Carstens	lgr	%r15,%r1
6314bfc86ceSHeiko Carstens	# TRACE_IRQS_ON already done at .Lio_return, call
6324bfc86ceSHeiko Carstens	# TRACE_IRQS_OFF to keep things symmetrical
6334bfc86ceSHeiko Carstens	TRACE_IRQS_OFF
6344bfc86ceSHeiko Carstens	brasl	%r14,preempt_schedule_irq
6354bfc86ceSHeiko Carstens	j	.Lio_return
6364bfc86ceSHeiko Carstens#else
6374bfc86ceSHeiko Carstens	j	.Lio_restore
6384bfc86ceSHeiko Carstens#endif
6394bfc86ceSHeiko Carstens
6404bfc86ceSHeiko Carstens#
6414bfc86ceSHeiko Carstens# Need to do work before returning to userspace, switch to kernel stack
6424bfc86ceSHeiko Carstens#
6434bfc86ceSHeiko Carstens.Lio_work_user:
6444bfc86ceSHeiko Carstens	lg	%r1,__LC_KERNEL_STACK
6454bfc86ceSHeiko Carstens	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
6464bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
6474bfc86ceSHeiko Carstens	la	%r11,STACK_FRAME_OVERHEAD(%r1)
6484bfc86ceSHeiko Carstens	lgr	%r15,%r1
6494bfc86ceSHeiko Carstens
6504bfc86ceSHeiko Carstens#
6514bfc86ceSHeiko Carstens# One of the work bits is on. Find out which one.
6524bfc86ceSHeiko Carstens#
6534bfc86ceSHeiko Carstens.Lio_work_tif:
65483abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
6554bfc86ceSHeiko Carstens	jo	.Lio_mcck_pending
65683abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_NEED_RESCHED
6574bfc86ceSHeiko Carstens	jo	.Lio_reschedule
65883abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_SIGPENDING
6594bfc86ceSHeiko Carstens	jo	.Lio_sigpending
66083abeffbSHendrik Brueckner	TSTMSK	__TI_flags(%r12),_TIF_NOTIFY_RESUME
6614bfc86ceSHeiko Carstens	jo	.Lio_notify_resume
66283abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
6639977e886SHendrik Brueckner	jo	.Lio_vxrs
664*606aa4aaSHeiko Carstens	TSTMSK	__LC_CPU_FLAGS,_CIF_ASCE_PRIMARY
665*606aa4aaSHeiko Carstens	jo	.Lio_asce_primary
6664bfc86ceSHeiko Carstens	j	.Lio_return		# beware of critical section cleanup
6674bfc86ceSHeiko Carstens
6684bfc86ceSHeiko Carstens#
6694bfc86ceSHeiko Carstens# _CIF_MCCK_PENDING is set, call handler
6704bfc86ceSHeiko Carstens#
6714bfc86ceSHeiko Carstens.Lio_mcck_pending:
6724bfc86ceSHeiko Carstens	# TRACE_IRQS_ON already done at .Lio_return
6734bfc86ceSHeiko Carstens	brasl	%r14,s390_handle_mcck	# TIF bit will be cleared by handler
6744bfc86ceSHeiko Carstens	TRACE_IRQS_OFF
6754bfc86ceSHeiko Carstens	j	.Lio_return
6764bfc86ceSHeiko Carstens
6774bfc86ceSHeiko Carstens#
678*606aa4aaSHeiko Carstens# _CIF_ASCE_PRIMARY is set, load user space asce
6794bfc86ceSHeiko Carstens#
680*606aa4aaSHeiko Carstens.Lio_asce_primary:
681*606aa4aaSHeiko Carstens	ni	__LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
6824bfc86ceSHeiko Carstens	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
6834bfc86ceSHeiko Carstens	j	.Lio_return
6844bfc86ceSHeiko Carstens
6854bfc86ceSHeiko Carstens#
6869977e886SHendrik Brueckner# CIF_FPU is set, restore floating-point controls and floating-point registers.
6879977e886SHendrik Brueckner#
6889977e886SHendrik Brueckner.Lio_vxrs:
6899977e886SHendrik Brueckner	larl	%r14,.Lio_return
6909977e886SHendrik Brueckner	jg	load_fpu_regs
6919977e886SHendrik Brueckner
6929977e886SHendrik Brueckner#
6934bfc86ceSHeiko Carstens# _TIF_NEED_RESCHED is set, call schedule
6944bfc86ceSHeiko Carstens#
6954bfc86ceSHeiko Carstens.Lio_reschedule:
6964bfc86ceSHeiko Carstens	# TRACE_IRQS_ON already done at .Lio_return
6974bfc86ceSHeiko Carstens	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
6984bfc86ceSHeiko Carstens	brasl	%r14,schedule		# call scheduler
6994bfc86ceSHeiko Carstens	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
7004bfc86ceSHeiko Carstens	TRACE_IRQS_OFF
7014bfc86ceSHeiko Carstens	j	.Lio_return
7024bfc86ceSHeiko Carstens
7034bfc86ceSHeiko Carstens#
7044bfc86ceSHeiko Carstens# _TIF_SIGPENDING or is set, call do_signal
7054bfc86ceSHeiko Carstens#
7064bfc86ceSHeiko Carstens.Lio_sigpending:
7074bfc86ceSHeiko Carstens	# TRACE_IRQS_ON already done at .Lio_return
7084bfc86ceSHeiko Carstens	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
7094bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
7104bfc86ceSHeiko Carstens	brasl	%r14,do_signal
7114bfc86ceSHeiko Carstens	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
7124bfc86ceSHeiko Carstens	TRACE_IRQS_OFF
7134bfc86ceSHeiko Carstens	j	.Lio_return
7144bfc86ceSHeiko Carstens
7154bfc86ceSHeiko Carstens#
7164bfc86ceSHeiko Carstens# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
7174bfc86ceSHeiko Carstens#
7184bfc86ceSHeiko Carstens.Lio_notify_resume:
7194bfc86ceSHeiko Carstens	# TRACE_IRQS_ON already done at .Lio_return
7204bfc86ceSHeiko Carstens	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
7214bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
7224bfc86ceSHeiko Carstens	brasl	%r14,do_notify_resume
7234bfc86ceSHeiko Carstens	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
7244bfc86ceSHeiko Carstens	TRACE_IRQS_OFF
7254bfc86ceSHeiko Carstens	j	.Lio_return
7264bfc86ceSHeiko Carstens
7274bfc86ceSHeiko Carstens/*
7284bfc86ceSHeiko Carstens * External interrupt handler routine
7294bfc86ceSHeiko Carstens */
7304bfc86ceSHeiko CarstensENTRY(ext_int_handler)
7314bfc86ceSHeiko Carstens	STCK	__LC_INT_CLOCK
7324bfc86ceSHeiko Carstens	stpt	__LC_ASYNC_ENTER_TIMER
7334bfc86ceSHeiko Carstens	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
734d5c352cdSHeiko Carstens	lg	%r12,__LC_CURRENT
7359977e886SHendrik Brueckner	larl	%r13,cleanup_critical
7364bfc86ceSHeiko Carstens	lmg	%r8,%r9,__LC_EXT_OLD_PSW
7372acb94f4SMartin Schwidefsky	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
7384bfc86ceSHeiko Carstens	stmg	%r0,%r7,__PT_R0(%r11)
7394bfc86ceSHeiko Carstens	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
7404bfc86ceSHeiko Carstens	stmg	%r8,%r9,__PT_PSW(%r11)
7414bfc86ceSHeiko Carstens	lghi	%r1,__LC_EXT_PARAMS2
7424bfc86ceSHeiko Carstens	mvc	__PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR
7434bfc86ceSHeiko Carstens	mvc	__PT_INT_PARM(4,%r11),__LC_EXT_PARAMS
7444bfc86ceSHeiko Carstens	mvc	__PT_INT_PARM_LONG(8,%r11),0(%r1)
7454bfc86ceSHeiko Carstens	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
746db7e007fSHeiko Carstens	TSTMSK	__LC_CPU_FLAGS,_CIF_IGNORE_IRQ
747db7e007fSHeiko Carstens	jo	.Lio_restore
7484bfc86ceSHeiko Carstens	TRACE_IRQS_OFF
7494bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
7504bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
7514bfc86ceSHeiko Carstens	lghi	%r3,EXT_INTERRUPT
7524bfc86ceSHeiko Carstens	brasl	%r14,do_IRQ
7534bfc86ceSHeiko Carstens	j	.Lio_return
7544bfc86ceSHeiko Carstens
7554bfc86ceSHeiko Carstens/*
7564bfc86ceSHeiko Carstens * Load idle PSW. The second "half" of this function is in .Lcleanup_idle.
7574bfc86ceSHeiko Carstens */
7584bfc86ceSHeiko CarstensENTRY(psw_idle)
7594bfc86ceSHeiko Carstens	stg	%r3,__SF_EMPTY(%r15)
7604bfc86ceSHeiko Carstens	larl	%r1,.Lpsw_idle_lpsw+4
7614bfc86ceSHeiko Carstens	stg	%r1,__SF_EMPTY+8(%r15)
76272d38b19SMartin Schwidefsky#ifdef CONFIG_SMP
76372d38b19SMartin Schwidefsky	larl	%r1,smp_cpu_mtid
76472d38b19SMartin Schwidefsky	llgf	%r1,0(%r1)
76572d38b19SMartin Schwidefsky	ltgr	%r1,%r1
76672d38b19SMartin Schwidefsky	jz	.Lpsw_idle_stcctm
76772d38b19SMartin Schwidefsky	.insn	rsy,0xeb0000000017,%r1,5,__SF_EMPTY+16(%r15)
76872d38b19SMartin Schwidefsky.Lpsw_idle_stcctm:
76972d38b19SMartin Schwidefsky#endif
770419123f9SMartin Schwidefsky	oi	__LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT
7714bfc86ceSHeiko Carstens	STCK	__CLOCK_IDLE_ENTER(%r2)
7724bfc86ceSHeiko Carstens	stpt	__TIMER_IDLE_ENTER(%r2)
7734bfc86ceSHeiko Carstens.Lpsw_idle_lpsw:
7744bfc86ceSHeiko Carstens	lpswe	__SF_EMPTY(%r15)
7754bfc86ceSHeiko Carstens	br	%r14
7764bfc86ceSHeiko Carstens.Lpsw_idle_end:
7774bfc86ceSHeiko Carstens
778b5510d9bSHendrik Brueckner/*
779b5510d9bSHendrik Brueckner * Store floating-point controls and floating-point or vector register
780b5510d9bSHendrik Brueckner * depending whether the vector facility is available.	A critical section
781b5510d9bSHendrik Brueckner * cleanup assures that the registers are stored even if interrupted for
782b5510d9bSHendrik Brueckner * some other work.  The CIF_FPU flag is set to trigger a lazy restore
783b5510d9bSHendrik Brueckner * of the register contents at return from io or a system call.
7849977e886SHendrik Brueckner */
7859977e886SHendrik BruecknerENTRY(save_fpu_regs)
786d0164ee2SHendrik Brueckner	lg	%r2,__LC_CURRENT
787d0164ee2SHendrik Brueckner	aghi	%r2,__TASK_thread
78883abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
7899977e886SHendrik Brueckner	bor	%r14
790d0164ee2SHendrik Brueckner	stfpc	__THREAD_FPU_fpc(%r2)
791d0164ee2SHendrik Brueckner	lg	%r3,__THREAD_FPU_regs(%r2)
79283abeffbSHendrik Brueckner	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_VX
7939977e886SHendrik Brueckner	jz	.Lsave_fpu_regs_fp	  # no -> store FP regs
7949977e886SHendrik Brueckner	VSTM	%v0,%v15,0,%r3		  # vstm 0,15,0(3)
7959977e886SHendrik Brueckner	VSTM	%v16,%v31,256,%r3	  # vstm 16,31,256(3)
7969977e886SHendrik Brueckner	j	.Lsave_fpu_regs_done	  # -> set CIF_FPU flag
7979977e886SHendrik Brueckner.Lsave_fpu_regs_fp:
7989977e886SHendrik Brueckner	std	0,0(%r3)
7999977e886SHendrik Brueckner	std	1,8(%r3)
8009977e886SHendrik Brueckner	std	2,16(%r3)
8019977e886SHendrik Brueckner	std	3,24(%r3)
8029977e886SHendrik Brueckner	std	4,32(%r3)
8039977e886SHendrik Brueckner	std	5,40(%r3)
8049977e886SHendrik Brueckner	std	6,48(%r3)
8059977e886SHendrik Brueckner	std	7,56(%r3)
8069977e886SHendrik Brueckner	std	8,64(%r3)
8079977e886SHendrik Brueckner	std	9,72(%r3)
8089977e886SHendrik Brueckner	std	10,80(%r3)
8099977e886SHendrik Brueckner	std	11,88(%r3)
8109977e886SHendrik Brueckner	std	12,96(%r3)
8119977e886SHendrik Brueckner	std	13,104(%r3)
8129977e886SHendrik Brueckner	std	14,112(%r3)
8139977e886SHendrik Brueckner	std	15,120(%r3)
8149977e886SHendrik Brueckner.Lsave_fpu_regs_done:
8159977e886SHendrik Brueckner	oi	__LC_CPU_FLAGS+7,_CIF_FPU
8169977e886SHendrik Brueckner	br	%r14
8179977e886SHendrik Brueckner.Lsave_fpu_regs_end:
818711f5df7SAl Viro#if IS_ENABLED(CONFIG_KVM)
819711f5df7SAl ViroEXPORT_SYMBOL(save_fpu_regs)
820711f5df7SAl Viro#endif
8219977e886SHendrik Brueckner
822b5510d9bSHendrik Brueckner/*
823b5510d9bSHendrik Brueckner * Load floating-point controls and floating-point or vector registers.
824b5510d9bSHendrik Brueckner * A critical section cleanup assures that the register contents are
825b5510d9bSHendrik Brueckner * loaded even if interrupted for some other work.
8269977e886SHendrik Brueckner *
8279977e886SHendrik Brueckner * There are special calling conventions to fit into sysc and io return work:
8289977e886SHendrik Brueckner *	%r15:	<kernel stack>
8299977e886SHendrik Brueckner * The function requires:
830b5510d9bSHendrik Brueckner *	%r4
8319977e886SHendrik Brueckner */
8329977e886SHendrik Bruecknerload_fpu_regs:
833d0164ee2SHendrik Brueckner	lg	%r4,__LC_CURRENT
834d0164ee2SHendrik Brueckner	aghi	%r4,__TASK_thread
83583abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU
8369977e886SHendrik Brueckner	bnor	%r14
837d0164ee2SHendrik Brueckner	lfpc	__THREAD_FPU_fpc(%r4)
83883abeffbSHendrik Brueckner	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_VX
839d0164ee2SHendrik Brueckner	lg	%r4,__THREAD_FPU_regs(%r4)	# %r4 <- reg save area
840b5510d9bSHendrik Brueckner	jz	.Lload_fpu_regs_fp		# -> no VX, load FP regs
8419977e886SHendrik Brueckner	VLM	%v0,%v15,0,%r4
8429977e886SHendrik Brueckner	VLM	%v16,%v31,256,%r4
8439977e886SHendrik Brueckner	j	.Lload_fpu_regs_done
8449977e886SHendrik Brueckner.Lload_fpu_regs_fp:
8459977e886SHendrik Brueckner	ld	0,0(%r4)
8469977e886SHendrik Brueckner	ld	1,8(%r4)
8479977e886SHendrik Brueckner	ld	2,16(%r4)
8489977e886SHendrik Brueckner	ld	3,24(%r4)
8499977e886SHendrik Brueckner	ld	4,32(%r4)
8509977e886SHendrik Brueckner	ld	5,40(%r4)
8519977e886SHendrik Brueckner	ld	6,48(%r4)
8529977e886SHendrik Brueckner	ld	7,56(%r4)
8539977e886SHendrik Brueckner	ld	8,64(%r4)
8549977e886SHendrik Brueckner	ld	9,72(%r4)
8559977e886SHendrik Brueckner	ld	10,80(%r4)
8569977e886SHendrik Brueckner	ld	11,88(%r4)
8579977e886SHendrik Brueckner	ld	12,96(%r4)
8589977e886SHendrik Brueckner	ld	13,104(%r4)
8599977e886SHendrik Brueckner	ld	14,112(%r4)
8609977e886SHendrik Brueckner	ld	15,120(%r4)
8619977e886SHendrik Brueckner.Lload_fpu_regs_done:
8629977e886SHendrik Brueckner	ni	__LC_CPU_FLAGS+7,255-_CIF_FPU
8639977e886SHendrik Brueckner	br	%r14
8649977e886SHendrik Brueckner.Lload_fpu_regs_end:
8659977e886SHendrik Brueckner
8664bfc86ceSHeiko Carstens.L__critical_end:
8674bfc86ceSHeiko Carstens
8684bfc86ceSHeiko Carstens/*
8694bfc86ceSHeiko Carstens * Machine check handler routines
8704bfc86ceSHeiko Carstens */
8714bfc86ceSHeiko CarstensENTRY(mcck_int_handler)
8724bfc86ceSHeiko Carstens	STCK	__LC_MCCK_CLOCK
8734bfc86ceSHeiko Carstens	la	%r1,4095		# revalidate r1
8744bfc86ceSHeiko Carstens	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
8754bfc86ceSHeiko Carstens	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
876d5c352cdSHeiko Carstens	lg	%r12,__LC_CURRENT
8779977e886SHendrik Brueckner	larl	%r13,cleanup_critical
8784bfc86ceSHeiko Carstens	lmg	%r8,%r9,__LC_MCK_OLD_PSW
87983abeffbSHendrik Brueckner	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_SYSTEM_DAMAGE
8804bfc86ceSHeiko Carstens	jo	.Lmcck_panic		# yes -> rest of mcck code invalid
8814bfc86ceSHeiko Carstens	lghi	%r14,__LC_CPU_TIMER_SAVE_AREA
8824bfc86ceSHeiko Carstens	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
88383abeffbSHendrik Brueckner	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_CPU_TIMER_VALID
8844bfc86ceSHeiko Carstens	jo	3f
8854bfc86ceSHeiko Carstens	la	%r14,__LC_SYNC_ENTER_TIMER
8864bfc86ceSHeiko Carstens	clc	0(8,%r14),__LC_ASYNC_ENTER_TIMER
8874bfc86ceSHeiko Carstens	jl	0f
8884bfc86ceSHeiko Carstens	la	%r14,__LC_ASYNC_ENTER_TIMER
8894bfc86ceSHeiko Carstens0:	clc	0(8,%r14),__LC_EXIT_TIMER
8904bfc86ceSHeiko Carstens	jl	1f
8914bfc86ceSHeiko Carstens	la	%r14,__LC_EXIT_TIMER
8924bfc86ceSHeiko Carstens1:	clc	0(8,%r14),__LC_LAST_UPDATE_TIMER
8934bfc86ceSHeiko Carstens	jl	2f
8944bfc86ceSHeiko Carstens	la	%r14,__LC_LAST_UPDATE_TIMER
8954bfc86ceSHeiko Carstens2:	spt	0(%r14)
8964bfc86ceSHeiko Carstens	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
89783abeffbSHendrik Brueckner3:	TSTMSK	__LC_MCCK_CODE,(MCCK_CODE_PSW_MWP_VALID|MCCK_CODE_PSW_IA_VALID)
8984bfc86ceSHeiko Carstens	jno	.Lmcck_panic		# no -> skip cleanup critical
8992acb94f4SMartin Schwidefsky	SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER
9004bfc86ceSHeiko Carstens.Lmcck_skip:
9014bfc86ceSHeiko Carstens	lghi	%r14,__LC_GPREGS_SAVE_AREA+64
9024bfc86ceSHeiko Carstens	stmg	%r0,%r7,__PT_R0(%r11)
9034bfc86ceSHeiko Carstens	mvc	__PT_R8(64,%r11),0(%r14)
9044bfc86ceSHeiko Carstens	stmg	%r8,%r9,__PT_PSW(%r11)
9054bfc86ceSHeiko Carstens	xc	__PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
9064bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
9074bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
9084bfc86ceSHeiko Carstens	brasl	%r14,s390_do_machine_check
9094bfc86ceSHeiko Carstens	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
9104bfc86ceSHeiko Carstens	jno	.Lmcck_return
9114bfc86ceSHeiko Carstens	lg	%r1,__LC_KERNEL_STACK	# switch to kernel stack
9124bfc86ceSHeiko Carstens	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
9134bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
9144bfc86ceSHeiko Carstens	la	%r11,STACK_FRAME_OVERHEAD(%r1)
9154bfc86ceSHeiko Carstens	lgr	%r15,%r1
9164bfc86ceSHeiko Carstens	ssm	__LC_PGM_NEW_PSW	# turn dat on, keep irqs off
91783abeffbSHendrik Brueckner	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
9184bfc86ceSHeiko Carstens	jno	.Lmcck_return
9194bfc86ceSHeiko Carstens	TRACE_IRQS_OFF
9204bfc86ceSHeiko Carstens	brasl	%r14,s390_handle_mcck
9214bfc86ceSHeiko Carstens	TRACE_IRQS_ON
9224bfc86ceSHeiko Carstens.Lmcck_return:
9234bfc86ceSHeiko Carstens	lg	%r14,__LC_VDSO_PER_CPU
9244bfc86ceSHeiko Carstens	lmg	%r0,%r10,__PT_R0(%r11)
9254bfc86ceSHeiko Carstens	mvc	__LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
9264bfc86ceSHeiko Carstens	tm	__LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
9274bfc86ceSHeiko Carstens	jno	0f
9284bfc86ceSHeiko Carstens	stpt	__LC_EXIT_TIMER
9294bfc86ceSHeiko Carstens	mvc	__VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
9304bfc86ceSHeiko Carstens0:	lmg	%r11,%r15,__PT_R11(%r11)
9314bfc86ceSHeiko Carstens	lpswe	__LC_RETURN_MCCK_PSW
9324bfc86ceSHeiko Carstens
9334bfc86ceSHeiko Carstens.Lmcck_panic:
9344bfc86ceSHeiko Carstens	lg	%r15,__LC_PANIC_STACK
935ce4dda3fSMartin Schwidefsky	la	%r11,STACK_FRAME_OVERHEAD(%r15)
9364bfc86ceSHeiko Carstens	j	.Lmcck_skip
9374bfc86ceSHeiko Carstens
9384bfc86ceSHeiko Carstens#
9394bfc86ceSHeiko Carstens# PSW restart interrupt handler
9404bfc86ceSHeiko Carstens#
9414bfc86ceSHeiko CarstensENTRY(restart_int_handler)
942e22cf8caSChristian Borntraeger	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
943e22cf8caSChristian Borntraeger	jz	0f
944e22cf8caSChristian Borntraeger	.insn	s,0xb2800000,__LC_LPP
945e22cf8caSChristian Borntraeger0:	stg	%r15,__LC_SAVE_AREA_RESTART
9464bfc86ceSHeiko Carstens	lg	%r15,__LC_RESTART_STACK
9474bfc86ceSHeiko Carstens	aghi	%r15,-__PT_SIZE			# create pt_regs on stack
9484bfc86ceSHeiko Carstens	xc	0(__PT_SIZE,%r15),0(%r15)
9494bfc86ceSHeiko Carstens	stmg	%r0,%r14,__PT_R0(%r15)
9504bfc86ceSHeiko Carstens	mvc	__PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
9514bfc86ceSHeiko Carstens	mvc	__PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw
9524bfc86ceSHeiko Carstens	aghi	%r15,-STACK_FRAME_OVERHEAD	# create stack frame on stack
9534bfc86ceSHeiko Carstens	xc	0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
9544bfc86ceSHeiko Carstens	lg	%r1,__LC_RESTART_FN		# load fn, parm & source cpu
9554bfc86ceSHeiko Carstens	lg	%r2,__LC_RESTART_DATA
9564bfc86ceSHeiko Carstens	lg	%r3,__LC_RESTART_SOURCE
9574bfc86ceSHeiko Carstens	ltgr	%r3,%r3				# test source cpu address
9584bfc86ceSHeiko Carstens	jm	1f				# negative -> skip source stop
9594bfc86ceSHeiko Carstens0:	sigp	%r4,%r3,SIGP_SENSE		# sigp sense to source cpu
9604bfc86ceSHeiko Carstens	brc	10,0b				# wait for status stored
9614bfc86ceSHeiko Carstens1:	basr	%r14,%r1			# call function
9624bfc86ceSHeiko Carstens	stap	__SF_EMPTY(%r15)		# store cpu address
9634bfc86ceSHeiko Carstens	llgh	%r3,__SF_EMPTY(%r15)
9644bfc86ceSHeiko Carstens2:	sigp	%r4,%r3,SIGP_STOP		# sigp stop to current cpu
9654bfc86ceSHeiko Carstens	brc	2,2b
9664bfc86ceSHeiko Carstens3:	j	3b
9674bfc86ceSHeiko Carstens
9684bfc86ceSHeiko Carstens	.section .kprobes.text, "ax"
9694bfc86ceSHeiko Carstens
9704bfc86ceSHeiko Carstens#ifdef CONFIG_CHECK_STACK
9714bfc86ceSHeiko Carstens/*
9724bfc86ceSHeiko Carstens * The synchronous or the asynchronous stack overflowed. We are dead.
9734bfc86ceSHeiko Carstens * No need to properly save the registers, we are going to panic anyway.
9744bfc86ceSHeiko Carstens * Setup a pt_regs so that show_trace can provide a good call trace.
9754bfc86ceSHeiko Carstens */
9764bfc86ceSHeiko Carstensstack_overflow:
9774bfc86ceSHeiko Carstens	lg	%r15,__LC_PANIC_STACK	# change to panic stack
9784bfc86ceSHeiko Carstens	la	%r11,STACK_FRAME_OVERHEAD(%r15)
9794bfc86ceSHeiko Carstens	stmg	%r0,%r7,__PT_R0(%r11)
9804bfc86ceSHeiko Carstens	stmg	%r8,%r9,__PT_PSW(%r11)
9814bfc86ceSHeiko Carstens	mvc	__PT_R8(64,%r11),0(%r14)
9824bfc86ceSHeiko Carstens	stg	%r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2
9834bfc86ceSHeiko Carstens	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
9844bfc86ceSHeiko Carstens	lgr	%r2,%r11		# pass pointer to pt_regs
9854bfc86ceSHeiko Carstens	jg	kernel_stack_overflow
9864bfc86ceSHeiko Carstens#endif
9874bfc86ceSHeiko Carstens
9884bfc86ceSHeiko Carstenscleanup_critical:
989d0fc4107SMartin Schwidefsky#if IS_ENABLED(CONFIG_KVM)
990d0fc4107SMartin Schwidefsky	clg	%r9,BASED(.Lcleanup_table_sie)	# .Lsie_gmap
991d0fc4107SMartin Schwidefsky	jl	0f
992d0fc4107SMartin Schwidefsky	clg	%r9,BASED(.Lcleanup_table_sie+8)# .Lsie_done
993d0fc4107SMartin Schwidefsky	jl	.Lcleanup_sie
994d0fc4107SMartin Schwidefsky#endif
9954bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table)	# system_call
9964bfc86ceSHeiko Carstens	jl	0f
9974bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table+8)	# .Lsysc_do_svc
9984bfc86ceSHeiko Carstens	jl	.Lcleanup_system_call
9994bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table+16)	# .Lsysc_tif
10004bfc86ceSHeiko Carstens	jl	0f
10014bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table+24)	# .Lsysc_restore
10024bfc86ceSHeiko Carstens	jl	.Lcleanup_sysc_tif
10034bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table+32)	# .Lsysc_done
10044bfc86ceSHeiko Carstens	jl	.Lcleanup_sysc_restore
10054bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table+40)	# .Lio_tif
10064bfc86ceSHeiko Carstens	jl	0f
10074bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table+48)	# .Lio_restore
10084bfc86ceSHeiko Carstens	jl	.Lcleanup_io_tif
10094bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table+56)	# .Lio_done
10104bfc86ceSHeiko Carstens	jl	.Lcleanup_io_restore
10114bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table+64)	# psw_idle
10124bfc86ceSHeiko Carstens	jl	0f
10134bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_table+72)	# .Lpsw_idle_end
10144bfc86ceSHeiko Carstens	jl	.Lcleanup_idle
10159977e886SHendrik Brueckner	clg	%r9,BASED(.Lcleanup_table+80)	# save_fpu_regs
10169977e886SHendrik Brueckner	jl	0f
10179977e886SHendrik Brueckner	clg	%r9,BASED(.Lcleanup_table+88)	# .Lsave_fpu_regs_end
10189977e886SHendrik Brueckner	jl	.Lcleanup_save_fpu_regs
10199977e886SHendrik Brueckner	clg	%r9,BASED(.Lcleanup_table+96)	# load_fpu_regs
10209977e886SHendrik Brueckner	jl	0f
10219977e886SHendrik Brueckner	clg	%r9,BASED(.Lcleanup_table+104)	# .Lload_fpu_regs_end
10229977e886SHendrik Brueckner	jl	.Lcleanup_load_fpu_regs
10234bfc86ceSHeiko Carstens0:	br	%r14
10244bfc86ceSHeiko Carstens
1025d0fc4107SMartin Schwidefsky	.align	8
1026d0fc4107SMartin Schwidefsky.Lcleanup_table:
1027d0fc4107SMartin Schwidefsky	.quad	system_call
1028d0fc4107SMartin Schwidefsky	.quad	.Lsysc_do_svc
1029d0fc4107SMartin Schwidefsky	.quad	.Lsysc_tif
1030d0fc4107SMartin Schwidefsky	.quad	.Lsysc_restore
1031d0fc4107SMartin Schwidefsky	.quad	.Lsysc_done
1032d0fc4107SMartin Schwidefsky	.quad	.Lio_tif
1033d0fc4107SMartin Schwidefsky	.quad	.Lio_restore
1034d0fc4107SMartin Schwidefsky	.quad	.Lio_done
1035d0fc4107SMartin Schwidefsky	.quad	psw_idle
1036d0fc4107SMartin Schwidefsky	.quad	.Lpsw_idle_end
1037d0fc4107SMartin Schwidefsky	.quad	save_fpu_regs
1038d0fc4107SMartin Schwidefsky	.quad	.Lsave_fpu_regs_end
1039d0fc4107SMartin Schwidefsky	.quad	load_fpu_regs
1040d0fc4107SMartin Schwidefsky	.quad	.Lload_fpu_regs_end
1041d0fc4107SMartin Schwidefsky
1042d0fc4107SMartin Schwidefsky#if IS_ENABLED(CONFIG_KVM)
1043d0fc4107SMartin Schwidefsky.Lcleanup_table_sie:
1044d0fc4107SMartin Schwidefsky	.quad	.Lsie_gmap
1045d0fc4107SMartin Schwidefsky	.quad	.Lsie_done
1046d0fc4107SMartin Schwidefsky
1047d0fc4107SMartin Schwidefsky.Lcleanup_sie:
1048d0fc4107SMartin Schwidefsky	lg	%r9,__SF_EMPTY(%r15)		# get control block pointer
1049e22cf8caSChristian Borntraeger	ni	__SIE_PROG0C+3(%r9),0xfe	# no longer in SIE
1050d0fc4107SMartin Schwidefsky	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
1051d0fc4107SMartin Schwidefsky	larl	%r9,sie_exit			# skip forward to sie_exit
1052d0fc4107SMartin Schwidefsky	br	%r14
1053d0fc4107SMartin Schwidefsky#endif
10544bfc86ceSHeiko Carstens
10554bfc86ceSHeiko Carstens.Lcleanup_system_call:
10564bfc86ceSHeiko Carstens	# check if stpt has been executed
10574bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_system_call_insn)
10584bfc86ceSHeiko Carstens	jh	0f
10594bfc86ceSHeiko Carstens	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
10604bfc86ceSHeiko Carstens	cghi	%r11,__LC_SAVE_AREA_ASYNC
10614bfc86ceSHeiko Carstens	je	0f
10624bfc86ceSHeiko Carstens	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
10634bfc86ceSHeiko Carstens0:	# check if stmg has been executed
10644bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_system_call_insn+8)
10654bfc86ceSHeiko Carstens	jh	0f
10664bfc86ceSHeiko Carstens	mvc	__LC_SAVE_AREA_SYNC(64),0(%r11)
10674bfc86ceSHeiko Carstens0:	# check if base register setup + TIF bit load has been done
10684bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_system_call_insn+16)
10694bfc86ceSHeiko Carstens	jhe	0f
107034525e1fSMartin Schwidefsky	# set up saved register r12 task struct pointer
107134525e1fSMartin Schwidefsky	stg	%r12,32(%r11)
107234525e1fSMartin Schwidefsky	# set up saved register r13 __TASK_thread offset
107334525e1fSMartin Schwidefsky	mvc	40(8,%r11),BASED(.Lcleanup_system_call_const)
10744bfc86ceSHeiko Carstens0:	# check if the user time update has been done
10754bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_system_call_insn+24)
10764bfc86ceSHeiko Carstens	jh	0f
10774bfc86ceSHeiko Carstens	lg	%r15,__LC_EXIT_TIMER
10784bfc86ceSHeiko Carstens	slg	%r15,__LC_SYNC_ENTER_TIMER
10794bfc86ceSHeiko Carstens	alg	%r15,__LC_USER_TIMER
10804bfc86ceSHeiko Carstens	stg	%r15,__LC_USER_TIMER
10814bfc86ceSHeiko Carstens0:	# check if the system time update has been done
10824bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_system_call_insn+32)
10834bfc86ceSHeiko Carstens	jh	0f
10844bfc86ceSHeiko Carstens	lg	%r15,__LC_LAST_UPDATE_TIMER
10854bfc86ceSHeiko Carstens	slg	%r15,__LC_EXIT_TIMER
10864bfc86ceSHeiko Carstens	alg	%r15,__LC_SYSTEM_TIMER
10874bfc86ceSHeiko Carstens	stg	%r15,__LC_SYSTEM_TIMER
10884bfc86ceSHeiko Carstens0:	# update accounting time stamp
10894bfc86ceSHeiko Carstens	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
109034525e1fSMartin Schwidefsky	# set up saved register r11
10914bfc86ceSHeiko Carstens	lg	%r15,__LC_KERNEL_STACK
10924bfc86ceSHeiko Carstens	la	%r9,STACK_FRAME_OVERHEAD(%r15)
10934bfc86ceSHeiko Carstens	stg	%r9,24(%r11)		# r11 pt_regs pointer
10944bfc86ceSHeiko Carstens	# fill pt_regs
10954bfc86ceSHeiko Carstens	mvc	__PT_R8(64,%r9),__LC_SAVE_AREA_SYNC
10964bfc86ceSHeiko Carstens	stmg	%r0,%r7,__PT_R0(%r9)
10974bfc86ceSHeiko Carstens	mvc	__PT_PSW(16,%r9),__LC_SVC_OLD_PSW
10984bfc86ceSHeiko Carstens	mvc	__PT_INT_CODE(4,%r9),__LC_SVC_ILC
10994bfc86ceSHeiko Carstens	xc	__PT_FLAGS(8,%r9),__PT_FLAGS(%r9)
11004bfc86ceSHeiko Carstens	mvi	__PT_FLAGS+7(%r9),_PIF_SYSCALL
11014bfc86ceSHeiko Carstens	# setup saved register r15
11024bfc86ceSHeiko Carstens	stg	%r15,56(%r11)		# r15 stack pointer
11034bfc86ceSHeiko Carstens	# set new psw address and exit
11044bfc86ceSHeiko Carstens	larl	%r9,.Lsysc_do_svc
11054bfc86ceSHeiko Carstens	br	%r14
11064bfc86ceSHeiko Carstens.Lcleanup_system_call_insn:
11074bfc86ceSHeiko Carstens	.quad	system_call
11084bfc86ceSHeiko Carstens	.quad	.Lsysc_stmg
11094bfc86ceSHeiko Carstens	.quad	.Lsysc_per
1110a359bb11SMartin Schwidefsky	.quad	.Lsysc_vtime+36
11114bfc86ceSHeiko Carstens	.quad	.Lsysc_vtime+42
111234525e1fSMartin Schwidefsky.Lcleanup_system_call_const:
111334525e1fSMartin Schwidefsky	.quad	__TASK_thread
11144bfc86ceSHeiko Carstens
11154bfc86ceSHeiko Carstens.Lcleanup_sysc_tif:
11164bfc86ceSHeiko Carstens	larl	%r9,.Lsysc_tif
11174bfc86ceSHeiko Carstens	br	%r14
11184bfc86ceSHeiko Carstens
11194bfc86ceSHeiko Carstens.Lcleanup_sysc_restore:
11204bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_sysc_restore_insn)
11214bfc86ceSHeiko Carstens	je	0f
11224bfc86ceSHeiko Carstens	lg	%r9,24(%r11)		# get saved pointer to pt_regs
11234bfc86ceSHeiko Carstens	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r9)
11244bfc86ceSHeiko Carstens	mvc	0(64,%r11),__PT_R8(%r9)
11254bfc86ceSHeiko Carstens	lmg	%r0,%r7,__PT_R0(%r9)
11264bfc86ceSHeiko Carstens0:	lmg	%r8,%r9,__LC_RETURN_PSW
11274bfc86ceSHeiko Carstens	br	%r14
11284bfc86ceSHeiko Carstens.Lcleanup_sysc_restore_insn:
11294bfc86ceSHeiko Carstens	.quad	.Lsysc_done - 4
11304bfc86ceSHeiko Carstens
11314bfc86ceSHeiko Carstens.Lcleanup_io_tif:
11324bfc86ceSHeiko Carstens	larl	%r9,.Lio_tif
11334bfc86ceSHeiko Carstens	br	%r14
11344bfc86ceSHeiko Carstens
11354bfc86ceSHeiko Carstens.Lcleanup_io_restore:
11364bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_io_restore_insn)
11374bfc86ceSHeiko Carstens	je	0f
11384bfc86ceSHeiko Carstens	lg	%r9,24(%r11)		# get saved r11 pointer to pt_regs
11394bfc86ceSHeiko Carstens	mvc	__LC_RETURN_PSW(16),__PT_PSW(%r9)
11404bfc86ceSHeiko Carstens	mvc	0(64,%r11),__PT_R8(%r9)
11414bfc86ceSHeiko Carstens	lmg	%r0,%r7,__PT_R0(%r9)
11424bfc86ceSHeiko Carstens0:	lmg	%r8,%r9,__LC_RETURN_PSW
11434bfc86ceSHeiko Carstens	br	%r14
11444bfc86ceSHeiko Carstens.Lcleanup_io_restore_insn:
11454bfc86ceSHeiko Carstens	.quad	.Lio_done - 4
11464bfc86ceSHeiko Carstens
11474bfc86ceSHeiko Carstens.Lcleanup_idle:
1148419123f9SMartin Schwidefsky	ni	__LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT
11494bfc86ceSHeiko Carstens	# copy interrupt clock & cpu timer
11504bfc86ceSHeiko Carstens	mvc	__CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK
11514bfc86ceSHeiko Carstens	mvc	__TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER
11524bfc86ceSHeiko Carstens	cghi	%r11,__LC_SAVE_AREA_ASYNC
11534bfc86ceSHeiko Carstens	je	0f
11544bfc86ceSHeiko Carstens	mvc	__CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
11554bfc86ceSHeiko Carstens	mvc	__TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER
11564bfc86ceSHeiko Carstens0:	# check if stck & stpt have been executed
11574bfc86ceSHeiko Carstens	clg	%r9,BASED(.Lcleanup_idle_insn)
11584bfc86ceSHeiko Carstens	jhe	1f
11594bfc86ceSHeiko Carstens	mvc	__CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
11604bfc86ceSHeiko Carstens	mvc	__TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
116172d38b19SMartin Schwidefsky1:	# calculate idle cycles
116272d38b19SMartin Schwidefsky#ifdef CONFIG_SMP
116372d38b19SMartin Schwidefsky	clg	%r9,BASED(.Lcleanup_idle_insn)
116472d38b19SMartin Schwidefsky	jl	3f
116572d38b19SMartin Schwidefsky	larl	%r1,smp_cpu_mtid
116672d38b19SMartin Schwidefsky	llgf	%r1,0(%r1)
116772d38b19SMartin Schwidefsky	ltgr	%r1,%r1
116872d38b19SMartin Schwidefsky	jz	3f
116972d38b19SMartin Schwidefsky	.insn	rsy,0xeb0000000017,%r1,5,__SF_EMPTY+80(%r15)
117072d38b19SMartin Schwidefsky	larl	%r3,mt_cycles
117172d38b19SMartin Schwidefsky	ag	%r3,__LC_PERCPU_OFFSET
117272d38b19SMartin Schwidefsky	la	%r4,__SF_EMPTY+16(%r15)
117372d38b19SMartin Schwidefsky2:	lg	%r0,0(%r3)
117472d38b19SMartin Schwidefsky	slg	%r0,0(%r4)
117572d38b19SMartin Schwidefsky	alg	%r0,64(%r4)
117672d38b19SMartin Schwidefsky	stg	%r0,0(%r3)
117772d38b19SMartin Schwidefsky	la	%r3,8(%r3)
117872d38b19SMartin Schwidefsky	la	%r4,8(%r4)
117972d38b19SMartin Schwidefsky	brct	%r1,2b
118072d38b19SMartin Schwidefsky#endif
118172d38b19SMartin Schwidefsky3:	# account system time going idle
11824bfc86ceSHeiko Carstens	lg	%r9,__LC_STEAL_TIMER
11834bfc86ceSHeiko Carstens	alg	%r9,__CLOCK_IDLE_ENTER(%r2)
11844bfc86ceSHeiko Carstens	slg	%r9,__LC_LAST_UPDATE_CLOCK
11854bfc86ceSHeiko Carstens	stg	%r9,__LC_STEAL_TIMER
11864bfc86ceSHeiko Carstens	mvc	__LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
11874bfc86ceSHeiko Carstens	lg	%r9,__LC_SYSTEM_TIMER
11884bfc86ceSHeiko Carstens	alg	%r9,__LC_LAST_UPDATE_TIMER
11894bfc86ceSHeiko Carstens	slg	%r9,__TIMER_IDLE_ENTER(%r2)
11904bfc86ceSHeiko Carstens	stg	%r9,__LC_SYSTEM_TIMER
11914bfc86ceSHeiko Carstens	mvc	__LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
11924bfc86ceSHeiko Carstens	# prepare return psw
11934bfc86ceSHeiko Carstens	nihh	%r8,0xfcfd		# clear irq & wait state bits
11944bfc86ceSHeiko Carstens	lg	%r9,48(%r11)		# return from psw_idle
11954bfc86ceSHeiko Carstens	br	%r14
11964bfc86ceSHeiko Carstens.Lcleanup_idle_insn:
11974bfc86ceSHeiko Carstens	.quad	.Lpsw_idle_lpsw
11984bfc86ceSHeiko Carstens
11999977e886SHendrik Brueckner.Lcleanup_save_fpu_regs:
1200e370e476SMartin Schwidefsky	larl	%r9,save_fpu_regs
12019977e886SHendrik Brueckner	br	%r14
12029977e886SHendrik Brueckner
12039977e886SHendrik Brueckner.Lcleanup_load_fpu_regs:
1204e370e476SMartin Schwidefsky	larl	%r9,load_fpu_regs
12059977e886SHendrik Brueckner	br	%r14
12069977e886SHendrik Brueckner
12074bfc86ceSHeiko Carstens/*
12084bfc86ceSHeiko Carstens * Integer constants
12094bfc86ceSHeiko Carstens */
12104bfc86ceSHeiko Carstens	.align	8
12114bfc86ceSHeiko Carstens.Lcritical_start:
12124bfc86ceSHeiko Carstens	.quad	.L__critical_start
12134bfc86ceSHeiko Carstens.Lcritical_length:
12144bfc86ceSHeiko Carstens	.quad	.L__critical_end - .L__critical_start
12154bfc86ceSHeiko Carstens#if IS_ENABLED(CONFIG_KVM)
1216d0fc4107SMartin Schwidefsky.Lsie_critical_start:
12174bfc86ceSHeiko Carstens	.quad	.Lsie_gmap
12184bfc86ceSHeiko Carstens.Lsie_critical_length:
12194bfc86ceSHeiko Carstens	.quad	.Lsie_done - .Lsie_gmap
12204bfc86ceSHeiko Carstens#endif
12214bfc86ceSHeiko Carstens
12224bfc86ceSHeiko Carstens	.section .rodata, "a"
1223a876cb3fSHeiko Carstens#define SYSCALL(esame,emu)	.long esame
12244bfc86ceSHeiko Carstens	.globl	sys_call_table
12254bfc86ceSHeiko Carstenssys_call_table:
12264bfc86ceSHeiko Carstens#include "syscalls.S"
12274bfc86ceSHeiko Carstens#undef SYSCALL
12284bfc86ceSHeiko Carstens
12294bfc86ceSHeiko Carstens#ifdef CONFIG_COMPAT
12304bfc86ceSHeiko Carstens
1231a876cb3fSHeiko Carstens#define SYSCALL(esame,emu)	.long emu
12324bfc86ceSHeiko Carstens	.globl	sys_call_table_emu
12334bfc86ceSHeiko Carstenssys_call_table_emu:
12344bfc86ceSHeiko Carstens#include "syscalls.S"
12354bfc86ceSHeiko Carstens#undef SYSCALL
12364bfc86ceSHeiko Carstens#endif
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