entry.S 25.8 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3
/*
 *    S390 low-level entry points.
 *
4
 *    Copyright IBM Corp. 1999, 2012
Linus Torvalds's avatar
Linus Torvalds committed
5
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
Heiko Carstens's avatar
Heiko Carstens committed
6 7
 *		 Hartmut Penner (hp@de.ibm.com),
 *		 Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
8
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
Linus Torvalds's avatar
Linus Torvalds committed
9 10
 */

11
#include <linux/init.h>
12
#include <linux/linkage.h>
Linus Torvalds's avatar
Linus Torvalds committed
13 14 15 16
#include <asm/cache.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
17
#include <asm/asm-offsets.h>
Linus Torvalds's avatar
Linus Torvalds committed
18 19
#include <asm/unistd.h>
#include <asm/page.h>
20
#include <asm/sigp.h>
Linus Torvalds's avatar
Linus Torvalds committed
21

22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
__PT_R0      =	__PT_GPRS
__PT_R1      =	__PT_GPRS + 4
__PT_R2      =	__PT_GPRS + 8
__PT_R3      =	__PT_GPRS + 12
__PT_R4      =	__PT_GPRS + 16
__PT_R5      =	__PT_GPRS + 20
__PT_R6      =	__PT_GPRS + 24
__PT_R7      =	__PT_GPRS + 28
__PT_R8      =	__PT_GPRS + 32
__PT_R9      =	__PT_GPRS + 36
__PT_R10     =	__PT_GPRS + 40
__PT_R11     =	__PT_GPRS + 44
__PT_R12     =	__PT_GPRS + 48
__PT_R13     =	__PT_GPRS + 524
__PT_R14     =	__PT_GPRS + 56
__PT_R15     =	__PT_GPRS + 60
Linus Torvalds's avatar
Linus Torvalds committed
38

Martin Schwidefsky's avatar
Martin Schwidefsky committed
39
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
40
		 _TIF_MCCK_PENDING | _TIF_PER_TRAP )
Martin Schwidefsky's avatar
Martin Schwidefsky committed
41
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
42
		 _TIF_MCCK_PENDING)
43 44
_TIF_TRACE    = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
		 _TIF_SYSCALL_TRACEPOINT)
Linus Torvalds's avatar
Linus Torvalds committed
45 46 47 48 49 50

STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE  = 1 << STACK_SHIFT

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

51
	.macro	TRACE_IRQS_ON
52
#ifdef CONFIG_TRACE_IRQFLAGS
53
	basr	%r2,%r0
54 55 56
	l	%r1,BASED(.Lhardirqs_on)
	basr	%r14,%r1		# call trace_hardirqs_on_caller
#endif
57 58 59
	.endm

	.macro	TRACE_IRQS_OFF
60
#ifdef CONFIG_TRACE_IRQFLAGS
61
	basr	%r2,%r0
62 63
	l	%r1,BASED(.Lhardirqs_off)
	basr	%r14,%r1		# call trace_hardirqs_off_caller
64
#endif
65
	.endm
66 67

	.macro	LOCKDEP_SYS_EXIT
68 69 70
#ifdef CONFIG_LOCKDEP
	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
	jz	.+10
71
	l	%r1,BASED(.Llockdep_sys_exit)
72
	basr	%r14,%r1		# call lockdep_sys_exit
73
#endif
74 75
	.endm

76
	.macro	CHECK_STACK stacksize,savearea
77
#ifdef CONFIG_CHECK_STACK
78 79 80
	tml	%r15,\stacksize - CONFIG_STACK_GUARD
	la	%r14,\savearea
	jz	stack_overflow
81 82 83
#endif
	.endm

84 85 86 87 88 89 90 91 92 93 94 95
	.macro	SWITCH_ASYNC savearea,stack,shift
	tmh	%r8,0x0001		# interrupting from user ?
	jnz	1f
	lr	%r14,%r9
	sl	%r14,BASED(.Lcritical_start)
	cl	%r14,BASED(.Lcritical_length)
	jhe	0f
	la	%r11,\savearea		# inside critical section, do cleanup
	bras	%r14,cleanup_critical
	tmh	%r8,0x0001		# retest problem state after cleanup
	jnz	1f
0:	l	%r14,\stack		# are we already on the target stack?
Linus Torvalds's avatar
Linus Torvalds committed
96
	slr	%r14,%r15
97 98 99 100 101 102 103
	sra	%r14,\shift
	jnz	1f
	CHECK_STACK 1<<\shift,\savearea
	j	2f
1:	l	%r15,\stack		# load target stack
2:	ahi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
	la	%r11,STACK_FRAME_OVERHEAD(%r15)
104 105
	.endm

106 107
	.macro	ADD64 high,low,timer
	al	\high,\timer
Martin Schwidefsky's avatar
Martin Schwidefsky committed
108
	al	\low,4+\timer
109 110
	brc	12,.+8
	ahi	\high,1
Linus Torvalds's avatar
Linus Torvalds committed
111 112
	.endm

113 114
	.macro	SUB64 high,low,timer
	sl	\high,\timer
Martin Schwidefsky's avatar
Martin Schwidefsky committed
115
	sl	\low,4+\timer
116 117 118 119 120 121 122 123 124 125 126 127 128 129
	brc	3,.+8
	ahi	\high,-1
	.endm

	.macro	UPDATE_VTIME high,low,enter_timer
	lm	\high,\low,__LC_EXIT_TIMER
	SUB64	\high,\low,\enter_timer
	ADD64	\high,\low,__LC_USER_TIMER
	stm	\high,\low,__LC_USER_TIMER
	lm	\high,\low,__LC_LAST_UPDATE_TIMER
	SUB64	\high,\low,__LC_EXIT_TIMER
	ADD64	\high,\low,__LC_SYSTEM_TIMER
	stm	\high,\low,__LC_SYSTEM_TIMER
	mvc	__LC_LAST_UPDATE_TIMER(8),\enter_timer
Linus Torvalds's avatar
Linus Torvalds committed
130 131
	.endm

132
	.macro REENABLE_IRQS
133 134 135
	st	%r8,__LC_RETURN_PSW
	ni	__LC_RETURN_PSW,0xbf
	ssm	__LC_RETURN_PSW
136 137
	.endm

138 139
	.section .kprobes.text, "ax"

Linus Torvalds's avatar
Linus Torvalds committed
140 141 142 143 144 145 146
/*
 * Scheduler resume function, called by switch_to
 *  gpr2 = (task_struct *) prev
 *  gpr3 = (task_struct *) next
 * Returns:
 *  gpr2 = prev
 */
147
ENTRY(__switch_to)
148 149
	stm	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
	st	%r15,__THREAD_ksp(%r2)		# store kernel stack of prev
150
	l	%r4,__THREAD_info(%r2)		# get thread_info of prev
Martin Schwidefsky's avatar
Martin Schwidefsky committed
151
	l	%r5,__THREAD_info(%r3)		# get thread_info of next
152 153 154 155 156 157 158 159
	lr	%r15,%r5
	ahi	%r15,STACK_SIZE			# end of kernel stack of next
	st	%r3,__LC_CURRENT		# store task struct of next
	st	%r5,__LC_THREAD_INFO		# store thread info of next
	st	%r15,__LC_KERNEL_STACK		# store end of kernel stack
	lctl	%c4,%c4,__TASK_pid(%r3)		# load pid to control reg. 4
	mvc	__LC_CURRENT_PID(4,%r0),__TASK_pid(%r3)	# store pid of next
	l	%r15,__THREAD_ksp(%r3)		# load kernel stack of next
160
	tm	__TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
161
	jz	0f
Martin Schwidefsky's avatar
Martin Schwidefsky committed
162 163
	ni	__TI_flags+3(%r4),255-_TIF_MCCK_PENDING	# clear flag in prev
	oi	__TI_flags+3(%r5),_TIF_MCCK_PENDING	# set it in next
164
0:	lm	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
Linus Torvalds's avatar
Linus Torvalds committed
165 166 167 168 169 170 171 172
	br	%r14

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

173
ENTRY(system_call)
174
	stpt	__LC_SYNC_ENTER_TIMER
175 176 177 178 179 180 181 182
sysc_stm:
	stm	%r8,%r15,__LC_SAVE_AREA_SYNC
	l	%r12,__LC_THREAD_INFO
	l	%r13,__LC_SVC_NEW_PSW+4
sysc_per:
	l	%r15,__LC_KERNEL_STACK
	ahi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
	la	%r11,STACK_FRAME_OVERHEAD(%r15)	# pointer to pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
183
sysc_vtime:
184 185 186 187
	UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER
	stm	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(32,%r11),__LC_SAVE_AREA_SYNC
	mvc	__PT_PSW(8,%r11),__LC_SVC_OLD_PSW
188
	mvc	__PT_INT_CODE(4,%r11),__LC_SVC_ILC
Linus Torvalds's avatar
Linus Torvalds committed
189
sysc_do_svc:
190
	oi	__TI_flags+3(%r12),_TIF_SYSCALL
191
	lh	%r8,__PT_INT_CODE+2(%r11)
192 193
	sla	%r8,2				# shift and test for svc0
	jnz	sysc_nr_ok
Linus Torvalds's avatar
Linus Torvalds committed
194 195
	# svc 0: system call number in %r1
	cl	%r1,BASED(.Lnr_syscalls)
196
	jnl	sysc_nr_ok
197
	sth	%r1,__PT_INT_CODE+2(%r11)
198 199
	lr	%r8,%r1
	sla	%r8,2
Linus Torvalds's avatar
Linus Torvalds committed
200
sysc_nr_ok:
201 202 203 204 205
	l	%r10,BASED(.Lsys_call_table)	# 31 bit system call table
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
	st	%r2,__PT_ORIG_GPR2(%r11)
	st	%r7,STACK_FRAME_OVERHEAD(%r15)
	l	%r9,0(%r8,%r10)			# get system call addr.
206
	tm	__TI_flags+2(%r12),_TIF_TRACE >> 8
207 208 209
	jnz	sysc_tracesys
	basr	%r14,%r9			# call sys_xxxx
	st	%r2,__PT_R2(%r11)		# store return value
Linus Torvalds's avatar
Linus Torvalds committed
210 211

sysc_return:
212 213
	LOCKDEP_SYS_EXIT
sysc_tif:
214 215
	tm	__PT_PSW+1(%r11),0x01		# returning to user ?
	jno	sysc_restore
216
	tm	__TI_flags+3(%r12),_TIF_WORK_SVC
217
	jnz	sysc_work			# check for work
218
	ni	__TI_flags+3(%r12),255-_TIF_SYSCALL
219
sysc_restore:
220 221 222 223
	mvc	__LC_RETURN_PSW(8),__PT_PSW(%r11)
	stpt	__LC_EXIT_TIMER
	lm	%r0,%r15,__PT_R0(%r11)
	lpsw	__LC_RETURN_PSW
224 225
sysc_done:

226 227 228
#
# One of the work bits is on. Find out which one.
#
229
sysc_work:
230
	tm	__TI_flags+3(%r12),_TIF_MCCK_PENDING
231
	jo	sysc_mcck_pending
232
	tm	__TI_flags+3(%r12),_TIF_NEED_RESCHED
233
	jo	sysc_reschedule
234 235
	tm	__TI_flags+3(%r12),_TIF_PER_TRAP
	jo	sysc_singlestep
236
	tm	__TI_flags+3(%r12),_TIF_SIGPENDING
237
	jo	sysc_sigpending
238
	tm	__TI_flags+3(%r12),_TIF_NOTIFY_RESUME
239 240
	jo	sysc_notify_resume
	j	sysc_return		# beware of critical section cleanup
Linus Torvalds's avatar
Linus Torvalds committed
241 242 243

#
# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens's avatar
Heiko Carstens committed
244 245 246
#
sysc_reschedule:
	l	%r1,BASED(.Lschedule)
247
	la	%r14,BASED(sysc_return)
248
	br	%r1			# call schedule
Linus Torvalds's avatar
Linus Torvalds committed
249

250 251 252 253
#
# _TIF_MCCK_PENDING is set, call handler
#
sysc_mcck_pending:
254
	l	%r1,BASED(.Lhandle_mcck)
255
	la	%r14,BASED(sysc_return)
256 257
	br	%r1			# TIF bit will be cleared by handler

Linus Torvalds's avatar
Linus Torvalds committed
258
#
259
# _TIF_SIGPENDING is set, call do_signal
Linus Torvalds's avatar
Linus Torvalds committed
260
#
Heiko Carstens's avatar
Heiko Carstens committed
261
sysc_sigpending:
262
	lr	%r2,%r11		# pass pointer to pt_regs
Heiko Carstens's avatar
Heiko Carstens committed
263 264
	l	%r1,BASED(.Ldo_signal)
	basr	%r14,%r1		# call do_signal
265
	tm	__TI_flags+3(%r12),_TIF_SYSCALL
266 267 268
	jno	sysc_return
	lm	%r2,%r7,__PT_R2(%r11)	# load svc arguments
	xr	%r8,%r8			# svc 0 returns -ENOSYS
269
	clc	__PT_INT_CODE+2(2,%r11),BASED(.Lnr_syscalls+2)
270
	jnl	sysc_nr_ok		# invalid svc number -> do svc 0
271
	lh	%r8,__PT_INT_CODE+2(%r11)	# load new svc number
272 273
	sla	%r8,2
	j	sysc_nr_ok		# restart svc
Linus Torvalds's avatar
Linus Torvalds committed
274

Martin Schwidefsky's avatar
Martin Schwidefsky committed
275 276 277 278
#
# _TIF_NOTIFY_RESUME is set, call do_notify_resume
#
sysc_notify_resume:
279
	lr	%r2,%r11		# pass pointer to pt_regs
Martin Schwidefsky's avatar
Martin Schwidefsky committed
280
	l	%r1,BASED(.Ldo_notify_resume)
281
	la	%r14,BASED(sysc_return)
Martin Schwidefsky's avatar
Martin Schwidefsky committed
282 283
	br	%r1			# call do_notify_resume

Linus Torvalds's avatar
Linus Torvalds committed
284
#
Martin Schwidefsky's avatar
Martin Schwidefsky committed
285
# _TIF_PER_TRAP is set, call do_per_trap
Linus Torvalds's avatar
Linus Torvalds committed
286 287
#
sysc_singlestep:
288
	ni	__TI_flags+3(%r12),255-_TIF_PER_TRAP
289 290 291 292
	lr	%r2,%r11		# pass pointer to pt_regs
	l	%r1,BASED(.Ldo_per_trap)
	la	%r14,BASED(sysc_return)
	br	%r1			# call do_per_trap
Linus Torvalds's avatar
Linus Torvalds committed
293 294

#
Martin Schwidefsky's avatar
Martin Schwidefsky committed
295 296
# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
# and after the system call
Linus Torvalds's avatar
Linus Torvalds committed
297 298
#
sysc_tracesys:
299 300
	l	%r1,BASED(.Ltrace_enter)
	lr	%r2,%r11		# pass pointer to pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
301
	la	%r3,0
302
	xr	%r0,%r0
303
	icm	%r0,3,__PT_INT_CODE+2(%r11)
304 305
	st	%r0,__PT_R2(%r11)
	basr	%r14,%r1		# call do_syscall_trace_enter
Martin Schwidefsky's avatar
Martin Schwidefsky committed
306
	cl	%r2,BASED(.Lnr_syscalls)
307 308 309 310
	jnl	sysc_tracenogo
	lr	%r8,%r2
	sll	%r8,2
	l	%r9,0(%r8,%r10)
Linus Torvalds's avatar
Linus Torvalds committed
311
sysc_tracego:
312 313 314 315 316
	lm	%r3,%r7,__PT_R3(%r11)
	st	%r7,STACK_FRAME_OVERHEAD(%r15)
	l	%r2,__PT_ORIG_GPR2(%r11)
	basr	%r14,%r9		# call sys_xxx
	st	%r2,__PT_R2(%r11)	# store return value
Linus Torvalds's avatar
Linus Torvalds committed
317
sysc_tracenogo:
318
	tm	__TI_flags+2(%r12),_TIF_TRACE >> 8
319
	jz	sysc_return
Martin Schwidefsky's avatar
Martin Schwidefsky committed
320
	l	%r1,BASED(.Ltrace_exit)
321
	lr	%r2,%r11		# pass pointer to pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
322
	la	%r14,BASED(sysc_return)
323
	br	%r1			# call do_syscall_trace_exit
Linus Torvalds's avatar
Linus Torvalds committed
324 325 326 327

#
# a new process exits the kernel with ret_from_fork
#
328
ENTRY(ret_from_fork)
329 330
	la	%r11,STACK_FRAME_OVERHEAD(%r15)
	l	%r12,__LC_THREAD_INFO
Linus Torvalds's avatar
Linus Torvalds committed
331
	l	%r13,__LC_SVC_NEW_PSW+4
332
	tm	__PT_PSW+1(%r11),0x01	# forking a kernel thread ?
333 334
	je	1f
	l	%r1,BASED(.Lschedule_tail)
335
	basr	%r14,%r1		# call schedule_tail
336
	TRACE_IRQS_ON
337 338
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
	j	sysc_tracenogo
Linus Torvalds's avatar
Linus Torvalds committed
339

340 341 342 343 344 345 346 347 348 349 350 351 352
1:	# it's a kernel thread
	st	%r15,__PT_R15(%r11)	# store stack pointer for new kthread
	l	%r1,BASED(.Lschedule_tail)
	basr	%r14,%r1		# call schedule_tail
	TRACE_IRQS_ON
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
	lm	%r9,%r11,__PT_R9(%r11)	# load gprs
ENTRY(kernel_thread_starter)
	la	%r2,0(%r10)
	basr	%r14,%r9
	la	%r2,0
	br	%r11			# do_exit

Linus Torvalds's avatar
Linus Torvalds committed
353
#
354 355
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
Linus Torvalds's avatar
Linus Torvalds committed
356
#
357 358 359 360 361
ENTRY(ret_from_kernel_execve)
	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
	lr	%r15,%r2
	lr	%r11,%r2
	ahi	%r15,-STACK_FRAME_OVERHEAD
362
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
363
	l	%r12,__LC_THREAD_INFO
364 365
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
	j	sysc_return
Linus Torvalds's avatar
Linus Torvalds committed
366 367 368 369 370

/*
 * Program check handler routine
 */

371
ENTRY(pgm_check_handler)
372
	stpt	__LC_SYNC_ENTER_TIMER
373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391
	stm	%r8,%r15,__LC_SAVE_AREA_SYNC
	l	%r12,__LC_THREAD_INFO
	l	%r13,__LC_SVC_NEW_PSW+4
	lm	%r8,%r9,__LC_PGM_OLD_PSW
	tmh	%r8,0x0001		# test problem state bit
	jnz	1f			# -> fault in user space
	tmh	%r8,0x4000		# PER bit set in old PSW ?
	jnz	0f			# -> enabled, can't be a double fault
	tm	__LC_PGM_ILC+3,0x80	# check for per exception
	jnz	pgm_svcper		# -> single stepped svc
0:	CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
	j	2f
1:	UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER
	l	%r15,__LC_KERNEL_STACK
2:	ahi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
	la	%r11,STACK_FRAME_OVERHEAD(%r15)
	stm	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(32,%r11),__LC_SAVE_AREA_SYNC
	stm	%r8,%r9,__PT_PSW(%r11)
392 393
	mvc	__PT_INT_CODE(4,%r11),__LC_PGM_ILC
	mvc	__PT_INT_PARM_LONG(4,%r11),__LC_TRANS_EXC_CODE
394 395
	tm	__LC_PGM_ILC+3,0x80	# check for per exception
	jz	0f
396
	l	%r1,__TI_task(%r12)
397 398 399
	tmh	%r8,0x0001		# kernel per event ?
	jz	pgm_kprobe
	oi	__TI_flags+3(%r12),_TIF_PER_TRAP
Martin Schwidefsky's avatar
Martin Schwidefsky committed
400
	mvc	__THREAD_per_address(4,%r1),__LC_PER_ADDRESS
401
	mvc	__THREAD_per_cause(2,%r1),__LC_PER_CAUSE
Martin Schwidefsky's avatar
Martin Schwidefsky committed
402
	mvc	__THREAD_per_paid(1,%r1),__LC_PER_PAID
403
0:	REENABLE_IRQS
404
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
405
	l	%r1,BASED(.Ljump_table)
406
	la	%r10,0x7f
407
	n	%r10,__PT_INT_CODE(%r11)
408 409 410 411
	je	sysc_return
	sll	%r10,2
	l	%r1,0(%r10,%r1)		# load address of handler routine
	lr	%r2,%r11		# pass pointer to pt_regs
412
	basr	%r14,%r1		# branch to interrupt-handler
413
	j	sysc_return
Linus Torvalds's avatar
Linus Torvalds committed
414 415

#
416
# PER event in supervisor state, must be kprobes
Linus Torvalds's avatar
Linus Torvalds committed
417
#
418 419 420 421 422 423 424
pgm_kprobe:
	REENABLE_IRQS
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
	l	%r1,BASED(.Ldo_per_trap)
	lr	%r2,%r11		# pass pointer to pt_regs
	basr	%r14,%r1		# call do_per_trap
	j	sysc_return
Linus Torvalds's avatar
Linus Torvalds committed
425

Michael Grundy's avatar
Michael Grundy committed
426
#
427
# single stepped system call
Michael Grundy's avatar
Michael Grundy committed
428
#
429 430 431 432 433
pgm_svcper:
	oi	__TI_flags+3(%r12),_TIF_PER_TRAP
	mvc	__LC_RETURN_PSW(4),__LC_SVC_NEW_PSW
	mvc	__LC_RETURN_PSW+4(4),BASED(.Lsysc_per)
	lpsw	__LC_RETURN_PSW		# branch to sysc_per and enable irqs
Michael Grundy's avatar
Michael Grundy committed
434

Linus Torvalds's avatar
Linus Torvalds committed
435 436 437 438
/*
 * IO interrupt handler routine
 */

439
ENTRY(io_int_handler)
Linus Torvalds's avatar
Linus Torvalds committed
440
	stck	__LC_INT_CLOCK
441
	stpt	__LC_ASYNC_ENTER_TIMER
442 443 444 445 446 447 448 449 450 451 452 453
	stm	%r8,%r15,__LC_SAVE_AREA_ASYNC
	l	%r12,__LC_THREAD_INFO
	l	%r13,__LC_SVC_NEW_PSW+4
	lm	%r8,%r9,__LC_IO_OLD_PSW
	tmh	%r8,0x0001		# interrupting from user ?
	jz	io_skip
	UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER
io_skip:
	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
	stm	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC
	stm	%r8,%r9,__PT_PSW(%r11)
454
	TRACE_IRQS_OFF
455 456 457 458
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
	l	%r1,BASED(.Ldo_IRQ)
	lr	%r2,%r11		# pass pointer to pt_regs
	basr	%r14,%r1		# call do_IRQ
Linus Torvalds's avatar
Linus Torvalds committed
459
io_return:
460 461 462
	LOCKDEP_SYS_EXIT
	TRACE_IRQS_ON
io_tif:
463
	tm	__TI_flags+3(%r12),_TIF_WORK_INT
464
	jnz	io_work			# there is work to do (signals etc.)
465
io_restore:
466 467 468 469
	mvc	__LC_RETURN_PSW(8),__PT_PSW(%r11)
	stpt	__LC_EXIT_TIMER
	lm	%r0,%r15,__PT_R0(%r11)
	lpsw	__LC_RETURN_PSW
470
io_done:
Linus Torvalds's avatar
Linus Torvalds committed
471

472
#
473 474 475 476 477
# There is work todo, find out in which context we have been interrupted:
# 1) if we return to user space we can do all _TIF_WORK_INT work
# 2) if we return to kernel code and preemptive scheduling is enabled check
#    the preemption counter and if it is zero call preempt_schedule_irq
# Before any work can be done, a switch to the kernel stack is required.
478 479
#
io_work:
480 481
	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
	jo	io_work_user		# yes -> do resched & signal
482
#ifdef CONFIG_PREEMPT
483
	# check for preemptive scheduling
484
	icm	%r0,15,__TI_precount(%r12)
485
	jnz	io_restore		# preemption disabled
486
	tm	__TI_flags+3(%r12),_TIF_NEED_RESCHED
487
	jno	io_restore
488
	# switch to kernel stack
489 490 491 492 493
	l	%r1,__PT_R15(%r11)
	ahi	%r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
	xc	__SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1)
	la	%r11,STACK_FRAME_OVERHEAD(%r1)
Linus Torvalds's avatar
Linus Torvalds committed
494
	lr	%r15,%r1
495 496 497
	# TRACE_IRQS_ON already done at io_return, call
	# TRACE_IRQS_OFF to keep things symmetrical
	TRACE_IRQS_OFF
498
	l	%r1,BASED(.Lpreempt_irq)
499
	basr	%r14,%r1		# call preempt_schedule_irq
500
	j	io_return
501
#else
502
	j	io_restore
503
#endif
Linus Torvalds's avatar
Linus Torvalds committed
504

505 506 507
#
# Need to do work before returning to userspace, switch to kernel stack
#
508
io_work_user:
Linus Torvalds's avatar
Linus Torvalds committed
509
	l	%r1,__LC_KERNEL_STACK
510 511 512 513
	ahi	%r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
	xc	__SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1)
	la	%r11,STACK_FRAME_OVERHEAD(%r1)
Linus Torvalds's avatar
Linus Torvalds committed
514
	lr	%r15,%r1
515

Linus Torvalds's avatar
Linus Torvalds committed
516 517
#
# One of the work bits is on. Find out which one.
518
# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED
Heiko Carstens's avatar
Heiko Carstens committed
519
#		and _TIF_MCCK_PENDING
Linus Torvalds's avatar
Linus Torvalds committed
520
#
521
io_work_tif:
522
	tm	__TI_flags+3(%r12),_TIF_MCCK_PENDING
523
	jo	io_mcck_pending
524
	tm	__TI_flags+3(%r12),_TIF_NEED_RESCHED
525
	jo	io_reschedule
526
	tm	__TI_flags+3(%r12),_TIF_SIGPENDING
527
	jo	io_sigpending
528
	tm	__TI_flags+3(%r12),_TIF_NOTIFY_RESUME
529 530
	jo	io_notify_resume
	j	io_return		# beware of critical section cleanup
Linus Torvalds's avatar
Linus Torvalds committed
531

532 533 534 535
#
# _TIF_MCCK_PENDING is set, call handler
#
io_mcck_pending:
536
	# TRACE_IRQS_ON already done at io_return
537
	l	%r1,BASED(.Lhandle_mcck)
Heiko Carstens's avatar
Heiko Carstens committed
538
	basr	%r14,%r1		# TIF bit will be cleared by handler
539
	TRACE_IRQS_OFF
540
	j	io_return
541

Linus Torvalds's avatar
Linus Torvalds committed
542 543
#
# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens's avatar
Heiko Carstens committed
544 545
#
io_reschedule:
546
	# TRACE_IRQS_ON already done at io_return
Heiko Carstens's avatar
Heiko Carstens committed
547
	l	%r1,BASED(.Lschedule)
548
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
Heiko Carstens's avatar
Heiko Carstens committed
549
	basr	%r14,%r1		# call scheduler
550
	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
551
	TRACE_IRQS_OFF
552
	j	io_return
Linus Torvalds's avatar
Linus Torvalds committed
553 554

#
555
# _TIF_SIGPENDING is set, call do_signal
Linus Torvalds's avatar
Linus Torvalds committed
556
#
Heiko Carstens's avatar
Heiko Carstens committed
557
io_sigpending:
558
	# TRACE_IRQS_ON already done at io_return
Heiko Carstens's avatar
Heiko Carstens committed
559
	l	%r1,BASED(.Ldo_signal)
560 561
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
	lr	%r2,%r11		# pass pointer to pt_regs
Heiko Carstens's avatar
Heiko Carstens committed
562
	basr	%r14,%r1		# call do_signal
563
	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
564
	TRACE_IRQS_OFF
565
	j	io_return
Linus Torvalds's avatar
Linus Torvalds committed
566

Martin Schwidefsky's avatar
Martin Schwidefsky committed
567 568 569 570
#
# _TIF_SIGPENDING is set, call do_signal
#
io_notify_resume:
571
	# TRACE_IRQS_ON already done at io_return
Martin Schwidefsky's avatar
Martin Schwidefsky committed
572
	l	%r1,BASED(.Ldo_notify_resume)
573 574 575 576
	ssm	__LC_SVC_NEW_PSW	# reenable interrupts
	lr	%r2,%r11		# pass pointer to pt_regs
	basr	%r14,%r1		# call do_notify_resume
	ssm	__LC_PGM_NEW_PSW	# disable I/O and ext. interrupts
Martin Schwidefsky's avatar
Martin Schwidefsky committed
577
	TRACE_IRQS_OFF
578
	j	io_return
Martin Schwidefsky's avatar
Martin Schwidefsky committed
579

Linus Torvalds's avatar
Linus Torvalds committed
580 581 582 583
/*
 * External interrupt handler routine
 */

584
ENTRY(ext_int_handler)
Linus Torvalds's avatar
Linus Torvalds committed
585
	stck	__LC_INT_CLOCK
586
	stpt	__LC_ASYNC_ENTER_TIMER
587 588 589 590 591 592 593 594 595 596 597 598
	stm	%r8,%r15,__LC_SAVE_AREA_ASYNC
	l	%r12,__LC_THREAD_INFO
	l	%r13,__LC_SVC_NEW_PSW+4
	lm	%r8,%r9,__LC_EXT_OLD_PSW
	tmh	%r8,0x0001		# interrupting from user ?
	jz	ext_skip
	UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER
ext_skip:
	SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
	stm	%r0,%r7,__PT_R0(%r11)
	mvc	__PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC
	stm	%r8,%r9,__PT_PSW(%r11)
599
	TRACE_IRQS_OFF
600
	lr	%r2,%r11		# pass pointer to pt_regs
601
	l	%r3,__LC_EXT_CPU_ADDR	# get cpu address + interruption code
602
	l	%r4,__LC_EXT_PARAMS	# get external parameters
Linus Torvalds's avatar
Linus Torvalds committed
603
	l	%r1,BASED(.Ldo_extint)
604 605
	basr	%r14,%r1		# call do_extint
	j	io_return
Linus Torvalds's avatar
Linus Torvalds committed
606

Martin Schwidefsky's avatar
Martin Schwidefsky committed
607 608 609 610
/*
 * Load idle PSW. The second "half" of this function is in cleanup_idle.
 */
ENTRY(psw_idle)
611
	st	%r3,__SF_EMPTY(%r15)
Martin Schwidefsky's avatar
Martin Schwidefsky committed
612 613 614 615
	basr	%r1,0
	la	%r1,psw_idle_lpsw+4-.(%r1)
	st	%r1,__SF_EMPTY+4(%r15)
	oi	__SF_EMPTY+4(%r15),0x80
616 617
	stck	__CLOCK_IDLE_ENTER(%r2)
	stpt	__TIMER_IDLE_ENTER(%r2)
Martin Schwidefsky's avatar
Martin Schwidefsky committed
618 619 620 621 622
psw_idle_lpsw:
	lpsw	__SF_EMPTY(%r15)
	br	%r14
psw_idle_end:

623 624
__critical_end:

Linus Torvalds's avatar
Linus Torvalds committed
625 626 627 628
/*
 * Machine check handler routines
 */

629
ENTRY(mcck_int_handler)
630
	stck	__LC_MCCK_CLOCK
631 632
	spt	__LC_CPU_TIMER_SAVE_AREA	# revalidate cpu timer
	lm	%r0,%r15,__LC_GPREGS_SAVE_AREA	# revalidate gprs
633 634 635
	l	%r12,__LC_THREAD_INFO
	l	%r13,__LC_SVC_NEW_PSW+4
	lm	%r8,%r9,__LC_MCK_OLD_PSW
Heiko Carstens's avatar
Heiko Carstens committed
636
	tm	__LC_MCCK_CODE,0x80	# system damage?
637 638 639
	jo	mcck_panic		# yes -> rest of mcck code invalid
	la	%r14,__LC_CPU_TIMER_SAVE_AREA
	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
640
	tm	__LC_MCCK_CODE+5,0x02	# stored cpu timer value valid?
641
	jo	3f
642 643
	la	%r14,__LC_SYNC_ENTER_TIMER
	clc	0(8,%r14),__LC_ASYNC_ENTER_TIMER
644
	jl	0f
645 646
	la	%r14,__LC_ASYNC_ENTER_TIMER
0:	clc	0(8,%r14),__LC_EXIT_TIMER
647
	jl	1f
648
	la	%r14,__LC_EXIT_TIMER
649 650
1:	clc	0(8,%r14),__LC_LAST_UPDATE_TIMER
	jl	2f
651
	la	%r14,__LC_LAST_UPDATE_TIMER
652
2:	spt	0(%r14)
653
	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668
3:	tm	__LC_MCCK_CODE+2,0x09	# mwp + ia of old psw valid?
	jno	mcck_panic		# no -> skip cleanup critical
	tm	%r8,0x0001		# interrupting from user ?
	jz	mcck_skip
	UPDATE_VTIME %r14,%r15,__LC_MCCK_ENTER_TIMER
mcck_skip:
	SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+32,__LC_PANIC_STACK,PAGE_SHIFT
	mvc	__PT_R0(64,%r11),__LC_GPREGS_SAVE_AREA
	stm	%r8,%r9,__PT_PSW(%r11)
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
	l	%r1,BASED(.Ldo_machine_check)
	lr	%r2,%r11		# pass pointer to pt_regs
	basr	%r14,%r1		# call s390_do_machine_check
	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
	jno	mcck_return
Heiko Carstens's avatar
Heiko Carstens committed
669
	l	%r1,__LC_KERNEL_STACK	# switch to kernel stack
670 671 672 673
	ahi	%r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
	xc	__SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1)
	la	%r11,STACK_FRAME_OVERHEAD(%r15)
674
	lr	%r15,%r1
675
	ssm	__LC_PGM_NEW_PSW	# turn dat on, keep irqs off
676
	tm	__TI_flags+3(%r12),_TIF_MCCK_PENDING
677
	jno	mcck_return
678
	TRACE_IRQS_OFF
679 680
	l	%r1,BASED(.Lhandle_mcck)
	basr	%r14,%r1		# call s390_handle_mcck
681
	TRACE_IRQS_ON
Linus Torvalds's avatar
Linus Torvalds committed
682
mcck_return:
683
	mvc	__LC_RETURN_MCCK_PSW(8),__PT_PSW(%r11) # move return PSW
684
	tm	__LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
685 686
	jno	0f
	lm	%r0,%r15,__PT_R0(%r11)
687
	stpt	__LC_EXIT_TIMER
688 689 690
	lpsw	__LC_RETURN_MCCK_PSW
0:	lm	%r0,%r15,__PT_R0(%r11)
	lpsw	__LC_RETURN_MCCK_PSW
691

692 693 694 695 696 697 698 699
mcck_panic:
	l	%r14,__LC_PANIC_STACK
	slr	%r14,%r15
	sra	%r14,PAGE_SHIFT
	jz	0f
	l	%r15,__LC_PANIC_STACK
0:	ahi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
	j	mcck_skip
Linus Torvalds's avatar
Linus Torvalds committed
700

701 702 703
#
# PSW restart interrupt handler
#
Martin Schwidefsky's avatar
Martin Schwidefsky committed
704
ENTRY(restart_int_handler)
705
	st	%r15,__LC_SAVE_AREA_RESTART
Martin Schwidefsky's avatar
Martin Schwidefsky committed
706
	l	%r15,__LC_RESTART_STACK
707
	ahi	%r15,-__PT_SIZE			# create pt_regs on stack
Martin Schwidefsky's avatar
Martin Schwidefsky committed
708
	xc	0(__PT_SIZE,%r15),0(%r15)
709 710 711
	stm	%r0,%r14,__PT_R0(%r15)
	mvc	__PT_R15(4,%r15),__LC_SAVE_AREA_RESTART
	mvc	__PT_PSW(8,%r15),__LC_RST_OLD_PSW # store restart old psw
Martin Schwidefsky's avatar
Martin Schwidefsky committed
712 713
	ahi	%r15,-STACK_FRAME_OVERHEAD	# create stack frame on stack
	xc	0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
714 715 716
	l	%r1,__LC_RESTART_FN		# load fn, parm & source cpu
	l	%r2,__LC_RESTART_DATA
	l	%r3,__LC_RESTART_SOURCE
Martin Schwidefsky's avatar
Martin Schwidefsky committed
717 718
	ltr	%r3,%r3				# test source cpu address
	jm	1f				# negative -> skip source stop
719
0:	sigp	%r4,%r3,SIGP_SENSE		# sigp sense to source cpu
Martin Schwidefsky's avatar
Martin Schwidefsky committed
720 721 722 723
	brc	10,0b				# wait for status stored
1:	basr	%r14,%r1			# call function
	stap	__SF_EMPTY(%r15)		# store cpu address
	lh	%r3,__SF_EMPTY(%r15)
724
2:	sigp	%r4,%r3,SIGP_STOP		# sigp stop to current cpu
Martin Schwidefsky's avatar
Martin Schwidefsky committed
725 726
	brc	2,2b
3:	j	3b
727

728 729
	.section .kprobes.text, "ax"

Linus Torvalds's avatar
Linus Torvalds committed
730 731 732 733 734 735 736 737
#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:
	l	%r15,__LC_PANIC_STACK	# change to panic stack
738 739 740 741 742 743 744 745 746 747
	ahi	%r15,-__PT_SIZE		# create pt_regs
	stm	%r0,%r7,__PT_R0(%r15)
	stm	%r8,%r9,__PT_PSW(%r15)
	mvc	__PT_R8(32,%r11),0(%r14)
	lr	%r15,%r11
	ahi	%r15,-STACK_FRAME_OVERHEAD
	l	%r1,BASED(1f)
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
	lr	%r2,%r11		# pass pointer to pt_regs
	br	%r1			# branch to kernel_stack_overflow
Heiko Carstens's avatar
Heiko Carstens committed
748
1:	.long	kernel_stack_overflow
Linus Torvalds's avatar
Linus Torvalds committed
749 750
#endif

751 752 753 754 755 756 757 758 759
cleanup_table:
	.long	system_call + 0x80000000
	.long	sysc_do_svc + 0x80000000
	.long	sysc_tif + 0x80000000
	.long	sysc_restore + 0x80000000
	.long	sysc_done + 0x80000000
	.long	io_tif + 0x80000000
	.long	io_restore + 0x80000000
	.long	io_done + 0x80000000
Martin Schwidefsky's avatar
Martin Schwidefsky committed
760 761
	.long	psw_idle + 0x80000000
	.long	psw_idle_end + 0x80000000
Linus Torvalds's avatar
Linus Torvalds committed
762 763

cleanup_critical:
764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779
	cl	%r9,BASED(cleanup_table)	# system_call
	jl	0f
	cl	%r9,BASED(cleanup_table+4)	# sysc_do_svc
	jl	cleanup_system_call
	cl	%r9,BASED(cleanup_table+8)	# sysc_tif
	jl	0f
	cl	%r9,BASED(cleanup_table+12)	# sysc_restore
	jl	cleanup_sysc_tif
	cl	%r9,BASED(cleanup_table+16)	# sysc_done
	jl	cleanup_sysc_restore
	cl	%r9,BASED(cleanup_table+20)	# io_tif
	jl	0f
	cl	%r9,BASED(cleanup_table+24)	# io_restore
	jl	cleanup_io_tif
	cl	%r9,BASED(cleanup_table+28)	# io_done
	jl	cleanup_io_restore
Martin Schwidefsky's avatar
Martin Schwidefsky committed
780 781 782 783
	cl	%r9,BASED(cleanup_table+32)	# psw_idle
	jl	0f
	cl	%r9,BASED(cleanup_table+36)	# psw_idle_end
	jl	cleanup_idle
784
0:	br	%r14
Linus Torvalds's avatar
Linus Torvalds committed
785 786

cleanup_system_call:
787 788 789
	# check if stpt has been executed
	cl	%r9,BASED(cleanup_system_call_insn)
	jh	0f
Linus Torvalds's avatar
Linus Torvalds committed
790
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
	chi	%r11,__LC_SAVE_AREA_ASYNC
	je	0f
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
0:	# check if stm has been executed
	cl	%r9,BASED(cleanup_system_call_insn+4)
	jh	0f
	mvc	__LC_SAVE_AREA_SYNC(32),0(%r11)
0:	# set up saved registers r12, and r13
	st	%r12,16(%r11)		# r12 thread-info pointer
	st	%r13,20(%r11)		# r13 literal-pool pointer
	# check if the user time calculation has been done
	cl	%r9,BASED(cleanup_system_call_insn+8)
	jh	0f
	l	%r10,__LC_EXIT_TIMER
	l	%r15,__LC_EXIT_TIMER+4
	SUB64	%r10,%r15,__LC_SYNC_ENTER_TIMER
	ADD64	%r10,%r15,__LC_USER_TIMER
	st	%r10,__LC_USER_TIMER
	st	%r15,__LC_USER_TIMER+4
0:	# check if the system time calculation has been done
	cl	%r9,BASED(cleanup_system_call_insn+12)
	jh	0f
	l	%r10,__LC_LAST_UPDATE_TIMER
	l	%r15,__LC_LAST_UPDATE_TIMER+4
	SUB64	%r10,%r15,__LC_EXIT_TIMER
	ADD64	%r10,%r15,__LC_SYSTEM_TIMER
	st	%r10,__LC_SYSTEM_TIMER
	st	%r15,__LC_SYSTEM_TIMER+4
0:	# update accounting time stamp
Linus Torvalds's avatar
Linus Torvalds committed
820
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
821 822 823 824 825 826 827 828
	# set up saved register 11
	l	%r15,__LC_KERNEL_STACK
	ahi	%r15,-__PT_SIZE
	st	%r15,12(%r11)		# r11 pt_regs pointer
	# fill pt_regs
	mvc	__PT_R8(32,%r15),__LC_SAVE_AREA_SYNC
	stm	%r0,%r7,__PT_R0(%r15)
	mvc	__PT_PSW(8,%r15),__LC_SVC_OLD_PSW
829
	mvc	__PT_INT_CODE(4,%r15),__LC_SVC_ILC
830 831 832 833 834
	# setup saved register 15
	ahi	%r15,-STACK_FRAME_OVERHEAD
	st	%r15,28(%r11)		# r15 stack pointer
	# set new psw address and exit
	l	%r9,BASED(cleanup_table+4)	# sysc_do_svc + 0x80000000
Linus Torvalds's avatar
Linus Torvalds committed
835 836
	br	%r14
cleanup_system_call_insn:
Heiko Carstens's avatar
Heiko Carstens committed
837
	.long	system_call + 0x80000000
838 839 840
	.long	sysc_stm + 0x80000000
	.long	sysc_vtime + 0x80000000 + 36
	.long	sysc_vtime + 0x80000000 + 76
Linus Torvalds's avatar
Linus Torvalds committed
841

842
cleanup_sysc_tif:
843
	l	%r9,BASED(cleanup_table+8)	# sysc_tif + 0x80000000
Linus Torvalds's avatar
Linus Torvalds committed
844 845
	br	%r14

846
cleanup_sysc_restore:
847 848 849 850 851 852 853
	cl	%r9,BASED(cleanup_sysc_restore_insn)
	jhe	0f
	l	%r9,12(%r11)		# get saved pointer to pt_regs
	mvc	__LC_RETURN_PSW(8),__PT_PSW(%r9)
	mvc	0(32,%r11),__PT_R8(%r9)
	lm	%r0,%r7,__PT_R0(%r9)
0:	lm	%r8,%r9,__LC_RETURN_PSW
Linus Torvalds's avatar
Linus Torvalds committed
854
	br	%r14
855
cleanup_sysc_restore_insn:
856
	.long	sysc_done - 4 + 0x80000000
Linus Torvalds's avatar
Linus Torvalds committed
857

858
cleanup_io_tif:
859
	l	%r9,BASED(cleanup_table+20)	# io_tif + 0x80000000
860 861
	br	%r14

862
cleanup_io_restore:
863 864 865 866 867 868 869
	cl	%r9,BASED(cleanup_io_restore_insn)
	jhe	0f
	l	%r9,12(%r11)		# get saved r11 pointer to pt_regs
	mvc	__LC_RETURN_PSW(8),__PT_PSW(%r9)
	mvc	0(32,%r11),__PT_R8(%r9)
	lm	%r0,%r7,__PT_R0(%r9)
0:	lm	%r8,%r9,__LC_RETURN_PSW
870
	br	%r14
871
cleanup_io_restore_insn:
872
	.long	io_done - 4 + 0x80000000
873

Martin Schwidefsky's avatar
Martin Schwidefsky committed
874 875
cleanup_idle:
	# copy interrupt clock & cpu timer
876 877
	mvc	__CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK
	mvc	__TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER
Martin Schwidefsky's avatar
Martin Schwidefsky committed
878 879
	chi	%r11,__LC_SAVE_AREA_ASYNC
	je	0f
880 881
	mvc	__CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
	mvc	__TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER
Martin Schwidefsky's avatar
Martin Schwidefsky committed
882 883 884
0:	# check if stck has been executed
	cl	%r9,BASED(cleanup_idle_insn)
	jhe	1f
885 886 887
	mvc	__CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
	mvc	__TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r3)
1:	# account system time going idle
Martin Schwidefsky's avatar
Martin Schwidefsky committed
888
	lm	%r9,%r10,__LC_STEAL_TIMER
889
	ADD64	%r9,%r10,__CLOCK_IDLE_ENTER(%r2)
Martin Schwidefsky's avatar
Martin Schwidefsky committed
890 891
	SUB64	%r9,%r10,__LC_LAST_UPDATE_CLOCK
	stm	%r9,%r10,__LC_STEAL_TIMER
892
	mvc	__LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
Martin Schwidefsky's avatar
Martin Schwidefsky committed
893 894
	lm	%r9,%r10,__LC_SYSTEM_TIMER
	ADD64	%r9,%r10,__LC_LAST_UPDATE_TIMER
895
	SUB64	%r9,%r10,__TIMER_IDLE_ENTER(%r2)
Martin Schwidefsky's avatar
Martin Schwidefsky committed
896
	stm	%r9,%r10,__LC_SYSTEM_TIMER
897
	mvc	__LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
Martin Schwidefsky's avatar
Martin Schwidefsky committed
898 899 900 901 902 903 904 905 906
	# prepare return psw
	n	%r8,BASED(cleanup_idle_wait)	# clear wait state bit
	l	%r9,24(%r11)			# return from psw_idle
	br	%r14
cleanup_idle_insn:
	.long	psw_idle_lpsw + 0x80000000
cleanup_idle_wait:
	.long	0xfffdffff

Linus Torvalds's avatar
Linus Torvalds committed
907 908 909
/*
 * Integer constants
 */
910
	.align	4
Martin Schwidefsky's avatar
Martin Schwidefsky committed
911 912 913 914
.Lnr_syscalls:
	.long	NR_syscalls
.Lvtimer_max:
	.quad	0x7fffffffffffffff
Linus Torvalds's avatar
Linus Torvalds committed
915 916 917 918

/*
 * Symbol constants
 */
919 920 921 922 923 924 925 926 927
.Ldo_machine_check:	.long	s390_do_machine_check
.Lhandle_mcck:		.long	s390_handle_mcck
.Ldo_IRQ:		.long	do_IRQ
.Ldo_extint:		.long	do_extint
.Ldo_signal:		.long	do_signal
.Ldo_notify_resume:	.long	do_notify_resume
.Ldo_per_trap:		.long	do_per_trap
.Ljump_table:		.long	pgm_check_table
.Lschedule:		.long	schedule
928
#ifdef CONFIG_PREEMPT
929
.Lpreempt_irq:		.long	preempt_schedule_irq
930
#endif
931 932 933 934 935
.Ltrace_enter:		.long	do_syscall_trace_enter
.Ltrace_exit:		.long	do_syscall_trace_exit
.Lschedule_tail:	.long	schedule_tail
.Lsys_call_table:	.long	sys_call_table
.Lsysc_per:		.long	sysc_per + 0x80000000
936
#ifdef CONFIG_TRACE_IRQFLAGS
937 938
.Lhardirqs_on:		.long	trace_hardirqs_on_caller
.Lhardirqs_off:		.long	trace_hardirqs_off_caller
939 940
#endif
#ifdef CONFIG_LOCKDEP
941
.Llockdep_sys_exit:	.long	lockdep_sys_exit
942
#endif
943 944
.Lcritical_start:	.long	__critical_start + 0x80000000
.Lcritical_length:	.long	__critical_end - __critical_start
Linus Torvalds's avatar
Linus Torvalds committed
945

Heiko Carstens's avatar
Heiko Carstens committed
946
		.section .rodata, "a"
Linus Torvalds's avatar
Linus Torvalds committed
947
#define SYSCALL(esa,esame,emu)	.long esa
948
	.globl	sys_call_table
Linus Torvalds's avatar
Linus Torvalds committed
949 950 951
sys_call_table:
#include "syscalls.S"
#undef SYSCALL