entry64.S 28.8 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
/*
2
 *  arch/s390/kernel/entry64.S
Linus Torvalds's avatar
Linus Torvalds committed
3
4
 *    S390 low-level entry points.
 *
5
 *    Copyright (C) IBM Corp. 1999,2006
Linus Torvalds's avatar
Linus Torvalds committed
6
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
Heiko Carstens's avatar
Heiko Carstens committed
7
8
 *		 Hartmut Penner (hp@de.ibm.com),
 *		 Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
9
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
Linus Torvalds's avatar
Linus Torvalds committed
10
11
12
13
14
15
16
17
18
 */

#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/cache.h>
#include <asm/lowcore.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
19
#include <asm/asm-offsets.h>
Linus Torvalds's avatar
Linus Torvalds committed
20
21
22
23
24
25
26
#include <asm/unistd.h>
#include <asm/page.h>

/*
 * Stack layout for the system_call stack entry.
 * The first few entries are identical to the user_regs_struct.
 */
Heiko Carstens's avatar
Heiko Carstens committed
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
SP_PTREGS    =	STACK_FRAME_OVERHEAD
SP_ARGS      =	STACK_FRAME_OVERHEAD + __PT_ARGS
SP_PSW	     =	STACK_FRAME_OVERHEAD + __PT_PSW
SP_R0	     =	STACK_FRAME_OVERHEAD + __PT_GPRS
SP_R1	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 8
SP_R2	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 16
SP_R3	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 24
SP_R4	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 32
SP_R5	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 40
SP_R6	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 48
SP_R7	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 56
SP_R8	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 64
SP_R9	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 72
SP_R10	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 80
SP_R11	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 88
SP_R12	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 96
SP_R13	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 104
SP_R14	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 112
SP_R15	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 120
SP_ORIG_R2   =	STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
SP_ILC	     =	STACK_FRAME_OVERHEAD + __PT_ILC
SP_TRAP      =	STACK_FRAME_OVERHEAD + __PT_TRAP
SP_SIZE      =	STACK_FRAME_OVERHEAD + __PT_SIZE
Linus Torvalds's avatar
Linus Torvalds committed
50
51
52
53

STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE  = 1 << STACK_SHIFT

54
55
56
57
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
		 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
		 _TIF_MCCK_PENDING)
Linus Torvalds's avatar
Linus Torvalds committed
58
59
60

#define BASED(name) name-system_call(%r13)

61
62
63
64
65
66
67
68
69
70
71
72
73
#ifdef CONFIG_TRACE_IRQFLAGS
	.macro	TRACE_IRQS_ON
	 brasl	%r14,trace_hardirqs_on
	.endm

	.macro	TRACE_IRQS_OFF
	 brasl	%r14,trace_hardirqs_off
	.endm
#else
#define TRACE_IRQS_ON
#define TRACE_IRQS_OFF
#endif

Heiko Carstens's avatar
Heiko Carstens committed
74
	.macro	STORE_TIMER lc_offset
Linus Torvalds's avatar
Linus Torvalds committed
75
76
77
78
79
80
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	stpt	\lc_offset
#endif
	.endm

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Heiko Carstens's avatar
Heiko Carstens committed
81
	.macro	UPDATE_VTIME lc_from,lc_to,lc_sum
Linus Torvalds's avatar
Linus Torvalds committed
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
	lg	%r10,\lc_from
	slg	%r10,\lc_to
	alg	%r10,\lc_sum
	stg	%r10,\lc_sum
	.endm
#endif

/*
 * Register usage in interrupt handlers:
 *    R9  - pointer to current task structure
 *    R13 - pointer to literal pool
 *    R14 - return register for function calls
 *    R15 - kernel stack pointer
 */

Heiko Carstens's avatar
Heiko Carstens committed
97
	.macro	SAVE_ALL_BASE savearea
Linus Torvalds's avatar
Linus Torvalds committed
98
99
100
101
	stmg	%r12,%r15,\savearea
	larl	%r13,system_call
	.endm

102
103
104
105
106
	.macro	SAVE_ALL_SVC psworg,savearea
	la	%r12,\psworg
	lg	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
	.endm

107
	.macro	SAVE_ALL_SYNC psworg,savearea
Linus Torvalds's avatar
Linus Torvalds committed
108
109
110
111
	la	%r12,\psworg
	tm	\psworg+1,0x01		# test problem state bit
	jz	2f			# skip stack setup save
	lg	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
112
113
114
115
116
117
118
119
120
121
122
#ifdef CONFIG_CHECK_STACK
	j	3f
2:	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
	jz	stack_overflow
3:
#endif
2:
	.endm

	.macro	SAVE_ALL_ASYNC psworg,savearea
	la	%r12,\psworg
Linus Torvalds's avatar
Linus Torvalds committed
123
124
125
126
127
128
129
	tm	\psworg+1,0x01		# test problem state bit
	jnz	1f			# from user -> load kernel stack
	clc	\psworg+8(8),BASED(.Lcritical_end)
	jhe	0f
	clc	\psworg+8(8),BASED(.Lcritical_start)
	jl	0f
	brasl	%r14,cleanup_critical
130
	tm	1(%r12),0x01		# retest problem state after cleanup
Linus Torvalds's avatar
Linus Torvalds committed
131
132
133
134
135
136
137
138
139
140
141
142
	jnz	1f
0:	lg	%r14,__LC_ASYNC_STACK	# are we already on the async. stack ?
	slgr	%r14,%r15
	srag	%r14,%r14,STACK_SHIFT
	jz	2f
1:	lg	%r15,__LC_ASYNC_STACK	# load async stack
#ifdef CONFIG_CHECK_STACK
	j	3f
2:	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
	jz	stack_overflow
3:
#endif
143
144
145
146
2:
	.endm

	.macro	CREATE_STACK_FRAME psworg,savearea
Heiko Carstens's avatar
Heiko Carstens committed
147
148
	aghi	%r15,-SP_SIZE		# make room for registers & psw
	mvc	SP_PSW(16,%r15),0(%r12)	# move user PSW to stack
Linus Torvalds's avatar
Linus Torvalds committed
149
150
151
152
153
154
155
156
	la	%r12,\psworg
	stg	%r2,SP_ORIG_R2(%r15)	# store original content of gpr 2
	icm	%r12,12,__LC_SVC_ILC
	stmg	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
	st	%r12,SP_ILC(%r15)
	mvc	SP_R12(32,%r15),\savearea # move %r12-%r15 to stack
	la	%r12,0
	stg	%r12,__SF_BACKCHAIN(%r15)
Heiko Carstens's avatar
Heiko Carstens committed
157
	.endm
Linus Torvalds's avatar
Linus Torvalds committed
158

159
160
	.macro	RESTORE_ALL psworg,sync
	mvc	\psworg(16),SP_PSW(%r15) # move user PSW to lowcore
Linus Torvalds's avatar
Linus Torvalds committed
161
	.if !\sync
162
	ni	\psworg+1,0xfd		# clear wait state bit
Linus Torvalds's avatar
Linus Torvalds committed
163
164
165
	.endif
	lmg	%r0,%r15,SP_R0(%r15)	# load gprs 0-15 of user
	STORE_TIMER __LC_EXIT_TIMER
166
	lpswe	\psworg			# back to caller
Linus Torvalds's avatar
Linus Torvalds committed
167
168
169
170
171
172
173
174
175
	.endm

/*
 * Scheduler resume function, called by switch_to
 *  gpr2 = (task_struct *) prev
 *  gpr3 = (task_struct *) next
 * Returns:
 *  gpr2 = prev
 */
Heiko Carstens's avatar
Heiko Carstens committed
176
	.globl	__switch_to
Linus Torvalds's avatar
Linus Torvalds committed
177
178
179
__switch_to:
	tm	__THREAD_per+4(%r3),0xe8 # is the new process using per ?
	jz	__switch_to_noper		# if not we're fine
Heiko Carstens's avatar
Heiko Carstens committed
180
181
182
183
	stctg	%c9,%c11,__SF_EMPTY(%r15)# We are using per stuff
	clc	__THREAD_per(24,%r3),__SF_EMPTY(%r15)
	je	__switch_to_noper	     # we got away without bashing TLB's
	lctlg	%c9,%c11,__THREAD_per(%r3)	# Nope we didn't
Linus Torvalds's avatar
Linus Torvalds committed
184
__switch_to_noper:
Heiko Carstens's avatar
Heiko Carstens committed
185
	lg	%r4,__THREAD_info(%r2)		    # get thread_info of prev
186
187
188
189
190
191
	tm	__TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
	jz	__switch_to_no_mcck
	ni	__TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
	lg	%r4,__THREAD_info(%r3)		    # get thread_info of next
	oi	__TI_flags+7(%r4),_TIF_MCCK_PENDING # set it in next
__switch_to_no_mcck:
Heiko Carstens's avatar
Heiko Carstens committed
192
	stmg	%r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
Linus Torvalds's avatar
Linus Torvalds committed
193
194
	stg	%r15,__THREAD_ksp(%r2)	# store kernel stack to prev->tss.ksp
	lg	%r15,__THREAD_ksp(%r3)	# load kernel stack from next->tss.ksp
Heiko Carstens's avatar
Heiko Carstens committed
195
	lmg	%r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
Linus Torvalds's avatar
Linus Torvalds committed
196
197
	stg	%r3,__LC_CURRENT	# __LC_CURRENT = current task struct
	lctl	%c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
Heiko Carstens's avatar
Heiko Carstens committed
198
	lg	%r3,__THREAD_info(%r3)	# load thread_info from task struct
Linus Torvalds's avatar
Linus Torvalds committed
199
200
201
202
203
204
205
206
207
208
209
	stg	%r3,__LC_THREAD_INFO
	aghi	%r3,STACK_SIZE
	stg	%r3,__LC_KERNEL_STACK	# __LC_KERNEL_STACK = new kernel stack
	br	%r14

__critical_start:
/*
 * SVC interrupt handler routine. System calls are synchronous events and
 * are executed with interrupts enabled.
 */

Heiko Carstens's avatar
Heiko Carstens committed
210
	.globl	system_call
Linus Torvalds's avatar
Linus Torvalds committed
211
212
213
214
system_call:
	STORE_TIMER __LC_SYNC_ENTER_TIMER
sysc_saveall:
	SAVE_ALL_BASE __LC_SAVE_AREA
215
	SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens's avatar
Heiko Carstens committed
216
217
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
	llgh	%r7,__LC_SVC_INT_CODE	# get svc number from lowcore
Linus Torvalds's avatar
Linus Torvalds committed
218
219
220
221
222
223
224
225
226
227
228
229
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
sysc_vtime:
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	sysc_do_svc
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
sysc_stime:
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
sysc_update:
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
#endif
sysc_do_svc:
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
Heiko Carstens's avatar
Heiko Carstens committed
230
	slag	%r7,%r7,2	# *4 and test for svc 0
Linus Torvalds's avatar
Linus Torvalds committed
231
232
233
234
	jnz	sysc_nr_ok
	# svc 0: system call number in %r1
	cl	%r1,BASED(.Lnr_syscalls)
	jnl	sysc_nr_ok
Heiko Carstens's avatar
Heiko Carstens committed
235
236
	lgfr	%r7,%r1 	# clear high word in r1
	slag	%r7,%r7,2	# svc 0: system call number in %r1
Linus Torvalds's avatar
Linus Torvalds committed
237
238
239
sysc_nr_ok:
	mvc	SP_ARGS(8,%r15),SP_R7(%r15)
sysc_do_restart:
Heiko Carstens's avatar
Heiko Carstens committed
240
	larl	%r10,sys_call_table
241
#ifdef CONFIG_COMPAT
242
243
	tm	__TI_flags+5(%r9),(_TIF_31BIT>>16)  # running in 31 bit mode ?
	jno	sysc_noemu
Heiko Carstens's avatar
Heiko Carstens committed
244
	larl	%r10,sys_call_table_emu  # use 31 bit emulation system calls
Linus Torvalds's avatar
Linus Torvalds committed
245
246
247
sysc_noemu:
#endif
	tm	__TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
Heiko Carstens's avatar
Heiko Carstens committed
248
249
250
251
	lgf	%r8,0(%r7,%r10) # load address of system call routine
	jnz	sysc_tracesys
	basr	%r14,%r8	# call sys_xxxx
	stg	%r2,SP_R2(%r15) # store return value (change R2 on stack)
Linus Torvalds's avatar
Linus Torvalds committed
252
253

sysc_return:
Heiko Carstens's avatar
Heiko Carstens committed
254
255
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
	jno	sysc_leave
Linus Torvalds's avatar
Linus Torvalds committed
256
	tm	__TI_flags+7(%r9),_TIF_WORK_SVC
Heiko Carstens's avatar
Heiko Carstens committed
257
	jnz	sysc_work	# there is work to do (signals etc.)
Linus Torvalds's avatar
Linus Torvalds committed
258
sysc_leave:
Heiko Carstens's avatar
Heiko Carstens committed
259
	RESTORE_ALL __LC_RETURN_PSW,1
Linus Torvalds's avatar
Linus Torvalds committed
260
261
262
263
264
265

#
# recheck if there is more work to do
#
sysc_work_loop:
	tm	__TI_flags+7(%r9),_TIF_WORK_SVC
Heiko Carstens's avatar
Heiko Carstens committed
266
	jz	sysc_leave	  # there is no work to do
Linus Torvalds's avatar
Linus Torvalds committed
267
268
269
270
#
# One of the work bits is on. Find out which one.
#
sysc_work:
271
272
	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING
	jo	sysc_mcck_pending
Linus Torvalds's avatar
Linus Torvalds committed
273
274
	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
	jo	sysc_reschedule
275
276
	tm	__TI_flags+7(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
	jnz	sysc_sigpending
Linus Torvalds's avatar
Linus Torvalds committed
277
278
279
280
281
282
283
284
	tm	__TI_flags+7(%r9),_TIF_RESTART_SVC
	jo	sysc_restart
	tm	__TI_flags+7(%r9),_TIF_SINGLE_STEP
	jo	sysc_singlestep
	j	sysc_leave

#
# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens's avatar
Heiko Carstens committed
285
286
287
288
#
sysc_reschedule:
	larl	%r14,sysc_work_loop
	jg	schedule	# return point is sysc_return
Linus Torvalds's avatar
Linus Torvalds committed
289

290
291
292
293
294
#
# _TIF_MCCK_PENDING is set, call handler
#
sysc_mcck_pending:
	larl	%r14,sysc_work_loop
Heiko Carstens's avatar
Heiko Carstens committed
295
	jg	s390_handle_mcck	# TIF bit will be cleared by handler
296

Linus Torvalds's avatar
Linus Torvalds committed
297
#
298
# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
Linus Torvalds's avatar
Linus Torvalds committed
299
#
Heiko Carstens's avatar
Heiko Carstens committed
300
sysc_sigpending:
Linus Torvalds's avatar
Linus Torvalds committed
301
	ni	__TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
Heiko Carstens's avatar
Heiko Carstens committed
302
303
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	brasl	%r14,do_signal		# call do_signal
Linus Torvalds's avatar
Linus Torvalds committed
304
305
306
307
	tm	__TI_flags+7(%r9),_TIF_RESTART_SVC
	jo	sysc_restart
	tm	__TI_flags+7(%r9),_TIF_SINGLE_STEP
	jo	sysc_singlestep
Heiko Carstens's avatar
Heiko Carstens committed
308
	j	sysc_work_loop
Linus Torvalds's avatar
Linus Torvalds committed
309
310
311
312
313
314

#
# _TIF_RESTART_SVC is set, set up registers and restart svc
#
sysc_restart:
	ni	__TI_flags+7(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
Heiko Carstens's avatar
Heiko Carstens committed
315
316
	lg	%r7,SP_R2(%r15)		# load new svc number
	slag	%r7,%r7,2		# *4
Linus Torvalds's avatar
Linus Torvalds committed
317
	mvc	SP_R2(8,%r15),SP_ORIG_R2(%r15) # restore first argument
Heiko Carstens's avatar
Heiko Carstens committed
318
319
	lmg	%r2,%r6,SP_R2(%r15)	# load svc arguments
	j	sysc_do_restart 	# restart svc
Linus Torvalds's avatar
Linus Torvalds committed
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336

#
# _TIF_SINGLE_STEP is set, call do_single_step
#
sysc_singlestep:
	ni	__TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
	lhi	%r0,__LC_PGM_OLD_PSW
	sth	%r0,SP_TRAP(%r15)	# set trap indication to pgm check
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	larl	%r14,sysc_return	# load adr. of system return
	jg	do_single_step		# branch to do_sigtrap

#
# call syscall_trace before and after system call
# special linkage: %r12 contains the return address for trace_svc
#
sysc_tracesys:
Heiko Carstens's avatar
Heiko Carstens committed
337
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
338
339
	la	%r3,0
	srl	%r7,2
Heiko Carstens's avatar
Heiko Carstens committed
340
341
	stg	%r7,SP_R2(%r15)
	brasl	%r14,syscall_trace
Linus Torvalds's avatar
Linus Torvalds committed
342
343
344
	lghi	%r0,NR_syscalls
	clg	%r0,SP_R2(%r15)
	jnh	sysc_tracenogo
Heiko Carstens's avatar
Heiko Carstens committed
345
346
	lg	%r7,SP_R2(%r15)		# strace might have changed the
	sll	%r7,2			# system call
Linus Torvalds's avatar
Linus Torvalds committed
347
348
	lgf	%r8,0(%r7,%r10)
sysc_tracego:
Heiko Carstens's avatar
Heiko Carstens committed
349
350
351
352
	lmg	%r3,%r6,SP_R3(%r15)
	lg	%r2,SP_ORIG_R2(%r15)
	basr	%r14,%r8		# call sys_xxx
	stg	%r2,SP_R2(%r15)		# store return value
Linus Torvalds's avatar
Linus Torvalds committed
353
354
sysc_tracenogo:
	tm	__TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
Heiko Carstens's avatar
Heiko Carstens committed
355
356
	jz	sysc_return
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
357
	la	%r3,1
Heiko Carstens's avatar
Heiko Carstens committed
358
	larl	%r14,sysc_return	# return point is sysc_return
Linus Torvalds's avatar
Linus Torvalds committed
359
360
361
362
363
	jg	syscall_trace

#
# a new process exits the kernel with ret_from_fork
#
Heiko Carstens's avatar
Heiko Carstens committed
364
	.globl	ret_from_fork
Linus Torvalds's avatar
Linus Torvalds committed
365
366
367
368
369
370
ret_from_fork:
	lg	%r13,__LC_SVC_NEW_PSW+8
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	tm	SP_PSW+1(%r15),0x01	# forking a kernel thread ?
	jo	0f
	stg	%r15,SP_R15(%r15)	# store stack pointer for new kthread
Heiko Carstens's avatar
Heiko Carstens committed
371
0:	brasl	%r14,schedule_tail
372
	TRACE_IRQS_ON
Heiko Carstens's avatar
Heiko Carstens committed
373
	stosm	24(%r15),0x03		# reenable interrupts
Linus Torvalds's avatar
Linus Torvalds committed
374
375
376
	j	sysc_return

#
377
378
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
Linus Torvalds's avatar
Linus Torvalds committed
379
#
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
	.globl	kernel_execve
kernel_execve:
	stmg	%r12,%r15,96(%r15)
	lgr	%r14,%r15
	aghi	%r15,-SP_SIZE
	stg	%r14,__SF_BACKCHAIN(%r15)
	la	%r12,SP_PTREGS(%r15)
	xc	0(__PT_SIZE,%r12),0(%r12)
	lgr	%r5,%r12
	brasl	%r14,do_execve
	ltgfr	%r2,%r2
	je	0f
	aghi	%r15,SP_SIZE
	lmg	%r12,%r15,96(%r15)
	br	%r14
	# execve succeeded.
0:	stnsm	__SF_EMPTY(%r15),0xfc	# disable interrupts
	lg	%r15,__LC_KERNEL_STACK	# load ksp
	aghi	%r15,-SP_SIZE		# make room for registers & psw
	lg	%r13,__LC_SVC_NEW_PSW+8
	lg	%r9,__LC_THREAD_INFO
	mvc	SP_PTREGS(__PT_SIZE,%r15),0(%r12)	# copy pt_regs
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	brasl	%r14,execve_tail
	j	sysc_return
Linus Torvalds's avatar
Linus Torvalds committed
406
407
408
409
410

/*
 * Program check handler routine
 */

Heiko Carstens's avatar
Heiko Carstens committed
411
	.globl	pgm_check_handler
Linus Torvalds's avatar
Linus Torvalds committed
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
pgm_check_handler:
/*
 * First we need to check for a special case:
 * Single stepping an instruction that disables the PER event mask will
 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
 * For a single stepped SVC the program check handler gets control after
 * the SVC new PSW has been loaded. But we want to execute the SVC first and
 * then handle the PER event. Therefore we update the SVC old PSW to point
 * to the pgm_check_handler and branch to the SVC handler after we checked
 * if we have to load the kernel stack register.
 * For every other possible cause for PER event without the PER mask set
 * we just ignore the PER event (FIXME: is there anything we have to do
 * for LPSW?).
 */
	STORE_TIMER __LC_SYNC_ENTER_TIMER
	SAVE_ALL_BASE __LC_SAVE_AREA
Heiko Carstens's avatar
Heiko Carstens committed
428
429
	tm	__LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
	jnz	pgm_per 		 # got per exception -> special case
430
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
431
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
432
433
434
435
436
437
438
439
440
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	pgm_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
Heiko Carstens's avatar
Heiko Carstens committed
441
	lgf	%r3,__LC_PGM_ILC	# load program interruption code
Linus Torvalds's avatar
Linus Torvalds committed
442
443
444
	lghi	%r8,0x7f
	ngr	%r8,%r3
pgm_do_call:
Heiko Carstens's avatar
Heiko Carstens committed
445
446
447
448
	sll	%r8,3
	larl	%r1,pgm_check_table
	lg	%r1,0(%r8,%r1)		# load address of handler routine
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
Linus Torvalds's avatar
Linus Torvalds committed
449
	larl	%r14,sysc_return
Heiko Carstens's avatar
Heiko Carstens committed
450
	br	%r1			# branch to interrupt-handler
Linus Torvalds's avatar
Linus Torvalds committed
451
452
453
454
455

#
# handle per exception
#
pgm_per:
Heiko Carstens's avatar
Heiko Carstens committed
456
457
	tm	__LC_PGM_OLD_PSW,0x40	# test if per event recording is on
	jnz	pgm_per_std		# ok, normal per event from user space
Linus Torvalds's avatar
Linus Torvalds committed
458
# ok its one of the special cases, now we need to find out which one
Heiko Carstens's avatar
Heiko Carstens committed
459
460
	clc	__LC_PGM_OLD_PSW(16),__LC_SVC_NEW_PSW
	je	pgm_svcper
Linus Torvalds's avatar
Linus Torvalds committed
461
462
# no interesting special case, ignore PER event
	lmg	%r12,%r15,__LC_SAVE_AREA
Heiko Carstens's avatar
Heiko Carstens committed
463
	lpswe	__LC_PGM_OLD_PSW
Linus Torvalds's avatar
Linus Torvalds committed
464
465
466
467
468

#
# Normal per exception
#
pgm_per_std:
469
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
470
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
471
472
473
474
475
476
477
478
479
480
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	pgm_no_vtime2
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime2:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	lg	%r1,__TI_task(%r9)
Michael Grundy's avatar
Michael Grundy committed
481
482
	tm	SP_PSW+1(%r15),0x01	# kernel per event ?
	jz	kernel_per
Linus Torvalds's avatar
Linus Torvalds committed
483
484
485
486
	mvc	__THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
	mvc	__THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
	mvc	__THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
	oi	__TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
Heiko Carstens's avatar
Heiko Carstens committed
487
	lgf	%r3,__LC_PGM_ILC	# load program interruption code
Linus Torvalds's avatar
Linus Torvalds committed
488
	lghi	%r8,0x7f
Heiko Carstens's avatar
Heiko Carstens committed
489
	ngr	%r8,%r3			# clear per-event-bit and ilc
Linus Torvalds's avatar
Linus Torvalds committed
490
491
492
493
494
495
496
	je	sysc_return
	j	pgm_do_call

#
# it was a single stepped SVC that is causing all the trouble
#
pgm_svcper:
497
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
498
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
499
500
501
502
503
504
505
506
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	pgm_no_vtime3
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime3:
#endif
Heiko Carstens's avatar
Heiko Carstens committed
507
	llgh	%r7,__LC_SVC_INT_CODE	# get svc number from lowcore
Linus Torvalds's avatar
Linus Torvalds committed
508
509
510
511
512
513
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	lg	%r1,__TI_task(%r9)
	mvc	__THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
	mvc	__THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
	mvc	__THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
	oi	__TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
514
	TRACE_IRQS_ON
Linus Torvalds's avatar
Linus Torvalds committed
515
516
517
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	j	sysc_do_svc

Michael Grundy's avatar
Michael Grundy committed
518
519
520
521
522
523
524
525
526
527
#
# per was called from kernel, must be kprobes
#
kernel_per:
	lhi	%r0,__LC_PGM_OLD_PSW
	sth	%r0,SP_TRAP(%r15)	# set trap indication to pgm check
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	larl	%r14,sysc_leave		# load adr. of system ret, no work
	jg	do_single_step		# branch to do_single_step

Linus Torvalds's avatar
Linus Torvalds committed
528
529
530
/*
 * IO interrupt handler routine
 */
Heiko Carstens's avatar
Heiko Carstens committed
531
	.globl io_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
532
533
534
535
io_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+32
536
	SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
537
	CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
Linus Torvalds's avatar
Linus Torvalds committed
538
539
540
541
542
543
544
545
546
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	io_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
io_no_vtime:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
547
	TRACE_IRQS_OFF
Heiko Carstens's avatar
Heiko Carstens committed
548
549
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	brasl	%r14,do_IRQ		# call standard irq handler
550
	TRACE_IRQS_ON
Linus Torvalds's avatar
Linus Torvalds committed
551
552

io_return:
Heiko Carstens's avatar
Heiko Carstens committed
553
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
Linus Torvalds's avatar
Linus Torvalds committed
554
#ifdef CONFIG_PREEMPT
Heiko Carstens's avatar
Heiko Carstens committed
555
	jno	io_preempt		# no -> check for preemptive scheduling
Linus Torvalds's avatar
Linus Torvalds committed
556
#else
Heiko Carstens's avatar
Heiko Carstens committed
557
	jno	io_leave		# no-> skip resched & signal
Linus Torvalds's avatar
Linus Torvalds committed
558
559
#endif
	tm	__TI_flags+7(%r9),_TIF_WORK_INT
Heiko Carstens's avatar
Heiko Carstens committed
560
	jnz	io_work 		# there is work to do (signals etc.)
Linus Torvalds's avatar
Linus Torvalds committed
561
io_leave:
Heiko Carstens's avatar
Heiko Carstens committed
562
	RESTORE_ALL __LC_RETURN_PSW,0
563
io_done:
Linus Torvalds's avatar
Linus Torvalds committed
564
565
566

#ifdef CONFIG_PREEMPT
io_preempt:
Heiko Carstens's avatar
Heiko Carstens committed
567
568
	icm	%r0,15,__TI_precount(%r9)
	jnz	io_leave
Linus Torvalds's avatar
Linus Torvalds committed
569
570
571
572
	# switch to kernel stack
	lg	%r1,SP_R15(%r15)
	aghi	%r1,-SP_SIZE
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens's avatar
Heiko Carstens committed
573
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds's avatar
Linus Torvalds committed
574
575
576
577
	lgr	%r15,%r1
io_resume_loop:
	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
	jno	io_leave
Heiko Carstens's avatar
Heiko Carstens committed
578
579
580
581
582
583
	larl	%r1,.Lc_pactive
	mvc	__TI_precount(4,%r9),0(%r1)
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	brasl	%r14,schedule		# call schedule
	stnsm	__SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
	xc	__TI_precount(4,%r9),__TI_precount(%r9)
Linus Torvalds's avatar
Linus Torvalds committed
584
585
586
587
588
589
590
591
592
593
	j	io_resume_loop
#endif

#
# switch to kernel stack, then check TIF bits
#
io_work:
	lg	%r1,__LC_KERNEL_STACK
	aghi	%r1,-SP_SIZE
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens's avatar
Heiko Carstens committed
594
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds's avatar
Linus Torvalds committed
595
596
597
	lgr	%r15,%r1
#
# One of the work bits is on. Find out which one.
598
599
# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGPENDING, _TIF_NEED_RESCHED
#	       and _TIF_MCCK_PENDING
Linus Torvalds's avatar
Linus Torvalds committed
600
601
#
io_work_loop:
602
603
	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING
	jo	io_mcck_pending
Linus Torvalds's avatar
Linus Torvalds committed
604
605
	tm	__TI_flags+7(%r9),_TIF_NEED_RESCHED
	jo	io_reschedule
606
607
	tm	__TI_flags+7(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
	jnz	io_sigpending
Linus Torvalds's avatar
Linus Torvalds committed
608
609
	j	io_leave

610
611
612
613
614
615
616
#
# _TIF_MCCK_PENDING is set, call handler
#
io_mcck_pending:
	larl	%r14,io_work_loop
	jg	s390_handle_mcck	# TIF bit will be cleared by handler

Linus Torvalds's avatar
Linus Torvalds committed
617
618
#
# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens's avatar
Heiko Carstens committed
619
620
621
622
623
#
io_reschedule:
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	brasl	%r14,schedule		# call scheduler
	stnsm	__SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
Linus Torvalds's avatar
Linus Torvalds committed
624
625
626
627
628
	tm	__TI_flags+7(%r9),_TIF_WORK_INT
	jz	io_leave		# there is no work to do
	j	io_work_loop

#
629
# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
Linus Torvalds's avatar
Linus Torvalds committed
630
#
Heiko Carstens's avatar
Heiko Carstens committed
631
632
633
io_sigpending:
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
634
	brasl	%r14,do_signal		# call do_signal
Heiko Carstens's avatar
Heiko Carstens committed
635
	stnsm	__SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
Heiko Carstens's avatar
Heiko Carstens committed
636
	j	io_work_loop
Linus Torvalds's avatar
Linus Torvalds committed
637
638
639
640

/*
 * External interrupt handler routine
 */
Heiko Carstens's avatar
Heiko Carstens committed
641
	.globl	ext_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
642
643
644
645
ext_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+32
646
	SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
647
	CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
Linus Torvalds's avatar
Linus Torvalds committed
648
649
650
651
652
653
654
655
656
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	ext_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
ext_no_vtime:
#endif
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
657
	TRACE_IRQS_OFF
Heiko Carstens's avatar
Heiko Carstens committed
658
659
660
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	llgh	%r3,__LC_EXT_INT_CODE	# get interruption code
	brasl	%r14,do_extint
661
	TRACE_IRQS_ON
Linus Torvalds's avatar
Linus Torvalds committed
662
663
	j	io_return

664
665
__critical_end:

Linus Torvalds's avatar
Linus Torvalds committed
666
667
668
/*
 * Machine check handler routines
 */
Heiko Carstens's avatar
Heiko Carstens committed
669
	.globl mcck_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
670
mcck_int_handler:
671
672
	la	%r1,4095		# revalidate r1
	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
Heiko Carstens's avatar
Heiko Carstens committed
673
	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
Linus Torvalds's avatar
Linus Torvalds committed
674
	SAVE_ALL_BASE __LC_SAVE_AREA+64
675
	la	%r12,__LC_MCK_OLD_PSW
Heiko Carstens's avatar
Heiko Carstens committed
676
	tm	__LC_MCCK_CODE,0x80	# system damage?
677
	jo	mcck_int_main		# yes -> rest of mcck code invalid
Linus Torvalds's avatar
Linus Torvalds committed
678
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
	la	%r14,4095
	mvc	__LC_SAVE_AREA+104(8),__LC_ASYNC_ENTER_TIMER
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r14)
	tm	__LC_MCCK_CODE+5,0x02	# stored cpu timer value valid?
	jo	1f
	la	%r14,__LC_SYNC_ENTER_TIMER
	clc	0(8,%r14),__LC_ASYNC_ENTER_TIMER
	jl	0f
	la	%r14,__LC_ASYNC_ENTER_TIMER
0:	clc	0(8,%r14),__LC_EXIT_TIMER
	jl	0f
	la	%r14,__LC_EXIT_TIMER
0:	clc	0(8,%r14),__LC_LAST_UPDATE_TIMER
	jl	0f
	la	%r14,__LC_LAST_UPDATE_TIMER
0:	spt	0(%r14)
	mvc	__LC_ASYNC_ENTER_TIMER(8),0(%r14)
1:
Linus Torvalds's avatar
Linus Torvalds committed
697
#endif
698
	tm	__LC_MCCK_CODE+2,0x09	# mwp + ia of old psw valid?
699
	jno	mcck_int_main		# no -> skip cleanup critical
Heiko Carstens's avatar
Heiko Carstens committed
700
	tm	__LC_MCK_OLD_PSW+1,0x01 # test problem state bit
701
702
703
	jnz	mcck_int_main		# from user -> load kernel stack
	clc	__LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_end)
	jhe	mcck_int_main
Heiko Carstens's avatar
Heiko Carstens committed
704
	clc	__LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_start)
705
	jl	mcck_int_main
Heiko Carstens's avatar
Heiko Carstens committed
706
	brasl	%r14,cleanup_critical
707
mcck_int_main:
Heiko Carstens's avatar
Heiko Carstens committed
708
	lg	%r14,__LC_PANIC_STACK	# are we already on the panic stack?
709
710
711
	slgr	%r14,%r15
	srag	%r14,%r14,PAGE_SHIFT
	jz	0f
Heiko Carstens's avatar
Heiko Carstens committed
712
	lg	%r15,__LC_PANIC_STACK	# load panic stack
713
0:	CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64
714
715
716
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	__LC_MCCK_CODE+2,0x08	# mwp of old psw valid?
	jno	mcck_no_vtime		# no -> no timer update
717
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
718
719
720
721
722
723
	jz	mcck_no_vtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
mcck_no_vtime:
#endif
724
725
726
	lg	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	brasl	%r14,s390_do_machine_check
Heiko Carstens's avatar
Heiko Carstens committed
727
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
728
729
730
731
732
733
734
735
736
	jno	mcck_return
	lg	%r1,__LC_KERNEL_STACK	# switch to kernel stack
	aghi	%r1,-SP_SIZE
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lgr	%r15,%r1
	stosm	__SF_EMPTY(%r15),0x04	# turn dat on
	tm	__TI_flags+7(%r9),_TIF_MCCK_PENDING
	jno	mcck_return
737
	TRACE_IRQS_OFF
738
	brasl	%r14,s390_handle_mcck
739
	TRACE_IRQS_ON
Linus Torvalds's avatar
Linus Torvalds committed
740
mcck_return:
741
742
743
744
745
746
747
748
749
750
751
	mvc	__LC_RETURN_MCCK_PSW(16),SP_PSW(%r15) # move return PSW
	ni	__LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
	lmg	%r0,%r15,SP_R0(%r15)	# load gprs 0-15
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+104
	tm	__LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
	jno	0f
	stpt	__LC_EXIT_TIMER
0:
#endif
	lpswe	__LC_RETURN_MCCK_PSW	# back to caller
Linus Torvalds's avatar
Linus Torvalds committed
752
753
754
755

/*
 * Restart interruption handler, kick starter for additional CPUs
 */
756
757
758
759
#ifdef CONFIG_SMP
#ifndef CONFIG_HOTPLUG_CPU
	.section .init.text,"ax"
#endif
Heiko Carstens's avatar
Heiko Carstens committed
760
	.globl restart_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
761
restart_int_handler:
Heiko Carstens's avatar
Heiko Carstens committed
762
763
764
765
766
767
768
769
	lg	%r15,__LC_SAVE_AREA+120 # load ksp
	lghi	%r10,__LC_CREGS_SAVE_AREA
	lctlg	%c0,%c15,0(%r10) # get new ctl regs
	lghi	%r10,__LC_AREGS_SAVE_AREA
	lam	%a0,%a15,0(%r10)
	lmg	%r6,%r15,__SF_GPRS(%r15) # load registers from clone
	stosm	__SF_EMPTY(%r15),0x04	# now we can turn dat on
	jg	start_secondary
770
771
772
#ifndef CONFIG_HOTPLUG_CPU
	.previous
#endif
Linus Torvalds's avatar
Linus Torvalds committed
773
774
775
776
#else
/*
 * If we do not run with SMP enabled, let the new CPU crash ...
 */
Heiko Carstens's avatar
Heiko Carstens committed
777
	.globl restart_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
778
restart_int_handler:
Heiko Carstens's avatar
Heiko Carstens committed
779
	basr	%r1,0
Linus Torvalds's avatar
Linus Torvalds committed
780
restart_base:
Heiko Carstens's avatar
Heiko Carstens committed
781
782
	lpswe	restart_crash-restart_base(%r1)
	.align 8
Linus Torvalds's avatar
Linus Torvalds committed
783
restart_crash:
Heiko Carstens's avatar
Heiko Carstens committed
784
	.long  0x000a0000,0x00000000,0x00000000,0x00000000
Linus Torvalds's avatar
Linus Torvalds committed
785
786
787
788
789
790
791
792
793
794
795
restart_go:
#endif

#ifdef CONFIG_CHECK_STACK
/*
 * The synchronous or the asynchronous stack overflowed. We are dead.
 * No need to properly save the registers, we are going to panic anyway.
 * Setup a pt_regs so that show_trace can provide a good call trace.
 */
stack_overflow:
	lg	%r15,__LC_PANIC_STACK	# change to panic stack
796
	aghi	%r15,-SP_SIZE
Linus Torvalds's avatar
Linus Torvalds committed
797
798
799
800
801
802
803
	mvc	SP_PSW(16,%r15),0(%r12)	# move user PSW to stack
	stmg	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
	la	%r1,__LC_SAVE_AREA
	chi	%r12,__LC_SVC_OLD_PSW
	je	0f
	chi	%r12,__LC_PGM_OLD_PSW
	je	0f
804
	la	%r1,__LC_SAVE_AREA+32
Heiko Carstens's avatar
Heiko Carstens committed
805
806
807
0:	mvc	SP_R12(32,%r15),0(%r1)	# move %r12-%r15 to stack
	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
808
809
810
811
812
813
814
815
816
817
818
	jg	kernel_stack_overflow
#endif

cleanup_table_system_call:
	.quad	system_call, sysc_do_svc
cleanup_table_sysc_return:
	.quad	sysc_return, sysc_leave
cleanup_table_sysc_leave:
	.quad	sysc_leave, sysc_work_loop
cleanup_table_sysc_work_loop:
	.quad	sysc_work_loop, sysc_reschedule
819
820
cleanup_table_io_return:
	.quad	io_return, io_leave
821
822
823
824
cleanup_table_io_leave:
	.quad	io_leave, io_done
cleanup_table_io_work_loop:
	.quad	io_work_loop, io_mcck_pending
Linus Torvalds's avatar
Linus Torvalds committed
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844

cleanup_critical:
	clc	8(8,%r12),BASED(cleanup_table_system_call)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_system_call+8)
	jl	cleanup_system_call
0:
	clc	8(8,%r12),BASED(cleanup_table_sysc_return)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_sysc_return+8)
	jl	cleanup_sysc_return
0:
	clc	8(8,%r12),BASED(cleanup_table_sysc_leave)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_sysc_leave+8)
	jl	cleanup_sysc_leave
0:
	clc	8(8,%r12),BASED(cleanup_table_sysc_work_loop)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)
845
	jl	cleanup_sysc_return
846
847
848
849
850
0:
	clc	8(8,%r12),BASED(cleanup_table_io_return)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_io_return+8)
	jl	cleanup_io_return
851
852
853
854
855
856
857
858
859
860
0:
	clc	8(8,%r12),BASED(cleanup_table_io_leave)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_io_leave+8)
	jl	cleanup_io_leave
0:
	clc	8(8,%r12),BASED(cleanup_table_io_work_loop)
	jl	0f
	clc	8(8,%r12),BASED(cleanup_table_io_work_loop+8)
	jl	cleanup_io_return
Linus Torvalds's avatar
Linus Torvalds committed
861
862
863
864
865
0:
	br	%r14

cleanup_system_call:
	mvc	__LC_RETURN_PSW(16),0(%r12)
866
867
868
869
870
871
	cghi	%r12,__LC_MCK_OLD_PSW
	je	0f
	la	%r12,__LC_SAVE_AREA+32
	j	1f
0:	la	%r12,__LC_SAVE_AREA+64
1:
Linus Torvalds's avatar
Linus Torvalds committed
872
873
874
875
876
877
878
879
880
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8)
	jh	0f
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
0:	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16)
	jhe	cleanup_vtime
#endif
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn)
	jh	0f
881
882
883
	mvc	__LC_SAVE_AREA(32),0(%r12)
0:	stg	%r13,8(%r12)
	stg	%r12,__LC_SAVE_AREA+96	# argh
884
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
885
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
886
887
	lg	%r12,__LC_SAVE_AREA+96	# argh
	stg	%r15,24(%r12)
Linus Torvalds's avatar
Linus Torvalds committed
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
	llgh	%r7,__LC_SVC_INT_CODE
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
cleanup_vtime:
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)
	jhe	cleanup_stime
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	jz	cleanup_novtime
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
cleanup_stime:
	clc	__LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+32)
	jh	cleanup_update
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
cleanup_update:
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
cleanup_novtime:
#endif
	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8)
	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_system_call_insn:
	.quad	sysc_saveall
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Heiko Carstens's avatar
Heiko Carstens committed
910
911
912
913
	.quad	system_call
	.quad	sysc_vtime
	.quad	sysc_stime
	.quad	sysc_update
Linus Torvalds's avatar
Linus Torvalds committed
914
915
916
917
918
919
920
921
922
923
#endif

cleanup_sysc_return:
	mvc	__LC_RETURN_PSW(8),0(%r12)
	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return)
	la	%r12,__LC_RETURN_PSW
	br	%r14

cleanup_sysc_leave:
	clc	8(8,%r12),BASED(cleanup_sysc_leave_insn)
924
	je	2f
Linus Torvalds's avatar
Linus Torvalds committed
925
926
927
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	8(8,%r12),BASED(cleanup_sysc_leave_insn+8)
928
	je	2f
Linus Torvalds's avatar
Linus Torvalds committed
929
930
#endif
	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)
931
932
933
934
935
936
	cghi	%r12,__LC_MCK_OLD_PSW
	jne	0f
	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)
	j	1f
0:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)
1:	lmg	%r0,%r11,SP_R0(%r15)
Linus Torvalds's avatar
Linus Torvalds committed
937
	lg	%r15,SP_R15(%r15)
938
2:	la	%r12,__LC_RETURN_PSW
Linus Torvalds's avatar
Linus Torvalds committed
939
940
941
942
943
944
945
	br	%r14
cleanup_sysc_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.quad	sysc_leave + 16
#endif
	.quad	sysc_leave + 12

946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
cleanup_io_return:
	mvc	__LC_RETURN_PSW(8),0(%r12)
	mvc	__LC_RETURN_PSW+8(8),BASED(cleanup_table_io_work_loop)
	la	%r12,__LC_RETURN_PSW
	br	%r14

cleanup_io_leave:
	clc	8(8,%r12),BASED(cleanup_io_leave_insn)
	je	2f
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	8(8,%r12),BASED(cleanup_io_leave_insn+8)
	je	2f
#endif
	mvc	__LC_RETURN_PSW(16),SP_PSW(%r15)
	cghi	%r12,__LC_MCK_OLD_PSW
	jne	0f
	mvc	__LC_SAVE_AREA+64(32),SP_R12(%r15)
	j	1f
0:	mvc	__LC_SAVE_AREA+32(32),SP_R12(%r15)
1:	lmg	%r0,%r11,SP_R0(%r15)
	lg	%r15,SP_R15(%r15)
2:	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_io_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.quad	io_leave + 20
#endif
	.quad	io_leave + 16

Linus Torvalds's avatar
Linus Torvalds committed
976
977
978
/*
 * Integer constants
 */
Heiko Carstens's avatar
Heiko Carstens committed
979
		.align	4
Linus Torvalds's avatar
Linus Torvalds committed
980
.Lconst:
Heiko Carstens's avatar
Heiko Carstens committed
981
982
983
984
985
986
987
.Lc_pactive:	.long	PREEMPT_ACTIVE
.Lnr_syscalls:	.long	NR_syscalls
.L0x0130:	.short	0x130
.L0x0140:	.short	0x140
.L0x0150:	.short	0x150
.L0x0160:	.short	0x160
.L0x0170:	.short	0x170
Linus Torvalds's avatar
Linus Torvalds committed
988
.Lcritical_start:
Heiko Carstens's avatar
Heiko Carstens committed
989
		.quad	__critical_start
Linus Torvalds's avatar
Linus Torvalds committed
990
.Lcritical_end:
Heiko Carstens's avatar
Heiko Carstens committed
991
		.quad	__critical_end
Linus Torvalds's avatar
Linus Torvalds committed
992

Heiko Carstens's avatar
Heiko Carstens committed
993
		.section .rodata, "a"
Linus Torvalds's avatar
Linus Torvalds committed
994
995
996
997
998
#define SYSCALL(esa,esame,emu)	.long esame
sys_call_table:
#include "syscalls.S"
#undef SYSCALL

999
#ifdef CONFIG_COMPAT
Linus Torvalds's avatar
Linus Torvalds committed
1000
1001
1002
1003
1004
1005

#define SYSCALL(esa,esame,emu)	.long emu
sys_call_table_emu:
#include "syscalls.S"
#undef SYSCALL
#endif