entry.S 31.8 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4
/*
 *  arch/s390/kernel/entry.S
 *    S390 low-level entry points.
 *
5
 *    Copyright (C) IBM Corp. 1999,2006
L
Linus Torvalds 已提交
6
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
H
Heiko Carstens 已提交
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>
L
Linus Torvalds 已提交
10 11 12 13
 */

#include <linux/sys.h>
#include <linux/linkage.h>
14
#include <linux/init.h>
L
Linus Torvalds 已提交
15 16 17 18
#include <asm/cache.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
19
#include <asm/asm-offsets.h>
L
Linus Torvalds 已提交
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.
 */
H
Heiko Carstens 已提交
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
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 + 4
SP_R2	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 8
SP_R3	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 12
SP_R4	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 16
SP_R5	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 20
SP_R6	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 24
SP_R7	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 28
SP_R8	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 32
SP_R9	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 36
SP_R10	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 40
SP_R11	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 44
SP_R12	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 48
SP_R13	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 52
SP_R14	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 56
SP_R15	     =	STACK_FRAME_OVERHEAD + __PT_GPRS + 60
SP_ORIG_R2   =	STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
SP_ILC	     =	STACK_FRAME_OVERHEAD + __PT_ILC
48
SP_SVCNR     =	STACK_FRAME_OVERHEAD + __PT_SVCNR
H
Heiko Carstens 已提交
49
SP_SIZE      =	STACK_FRAME_OVERHEAD + __PT_SIZE
L
Linus Torvalds 已提交
50

M
Martin Schwidefsky 已提交
51
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
52
		 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
M
Martin Schwidefsky 已提交
53
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
54
		 _TIF_MCCK_PENDING)
55
_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
56
		_TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8)
L
Linus Torvalds 已提交
57 58 59 60 61 62

STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE  = 1 << STACK_SHIFT

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

63 64
#ifdef CONFIG_TRACE_IRQFLAGS
	.macro	TRACE_IRQS_ON
65 66
	basr	%r2,%r0
	l	%r1,BASED(.Ltrace_irq_on_caller)
67 68 69 70
	basr	%r14,%r1
	.endm

	.macro	TRACE_IRQS_OFF
71 72
	basr	%r2,%r0
	l	%r1,BASED(.Ltrace_irq_off_caller)
73 74 75 76 77
	basr	%r14,%r1
	.endm
#else
#define TRACE_IRQS_ON
#define TRACE_IRQS_OFF
78 79 80 81 82 83 84 85 86 87 88
#endif

#ifdef CONFIG_LOCKDEP
	.macro	LOCKDEP_SYS_EXIT
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
	jz	0f
	l	%r1,BASED(.Llockdep_sys_exit)
	basr	%r14,%r1
0:
	.endm
#else
89
#define LOCKDEP_SYS_EXIT
90 91
#endif

L
Linus Torvalds 已提交
92 93 94 95 96 97 98 99
/*
 * 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
 */

H
Heiko Carstens 已提交
100
	.macro	UPDATE_VTIME lc_from,lc_to,lc_sum
L
Linus Torvalds 已提交
101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117
	lm	%r10,%r11,\lc_from
	sl	%r10,\lc_to
	sl	%r11,\lc_to+4
	bc	3,BASED(0f)
	sl	%r10,BASED(.Lc_1)
0:	al	%r10,\lc_sum
	al	%r11,\lc_sum+4
	bc	12,BASED(1f)
	al	%r10,BASED(.Lc_1)
1:	stm	%r10,%r11,\lc_sum
	.endm

	.macro	SAVE_ALL_BASE savearea
	stm	%r12,%r15,\savearea
	l	%r13,__LC_SVC_NEW_PSW+4	# load &system_call to %r13
	.endm

118 119 120 121 122
	.macro	SAVE_ALL_SVC psworg,savearea
	la	%r12,\psworg
	l	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
	.endm

123
	.macro	SAVE_ALL_SYNC psworg,savearea
L
Linus Torvalds 已提交
124 125 126 127
	la	%r12,\psworg
	tm	\psworg+1,0x01		# test problem state bit
	bz	BASED(2f)		# skip stack setup save
	l	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
128 129 130 131 132 133 134 135 136 137 138
#ifdef CONFIG_CHECK_STACK
	b	BASED(3f)
2:	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
	bz	BASED(stack_overflow)
3:
#endif
2:
	.endm

	.macro	SAVE_ALL_ASYNC psworg,savearea
	la	%r12,\psworg
L
Linus Torvalds 已提交
139 140 141 142 143 144 145 146
	tm	\psworg+1,0x01		# test problem state bit
	bnz	BASED(1f)		# from user -> load async stack
	clc	\psworg+4(4),BASED(.Lcritical_end)
	bhe	BASED(0f)
	clc	\psworg+4(4),BASED(.Lcritical_start)
	bl	BASED(0f)
	l	%r14,BASED(.Lcleanup_critical)
	basr	%r14,%r14
147
	tm	1(%r12),0x01		# retest problem state after cleanup
L
Linus Torvalds 已提交
148 149 150 151 152 153 154 155 156 157 158 159
	bnz	BASED(1f)
0:	l	%r14,__LC_ASYNC_STACK	# are we already on the async stack ?
	slr	%r14,%r15
	sra	%r14,STACK_SHIFT
	be	BASED(2f)
1:	l	%r15,__LC_ASYNC_STACK
#ifdef CONFIG_CHECK_STACK
	b	BASED(3f)
2:	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
	bz	BASED(stack_overflow)
3:
#endif
160 161 162
2:
	.endm

H
Heiko Carstens 已提交
163
	.macro	CREATE_STACK_FRAME psworg,savearea
164
	s	%r15,BASED(.Lc_spsize)	# make room for registers & psw
L
Linus Torvalds 已提交
165 166
	mvc	SP_PSW(8,%r15),0(%r12)	# move user PSW to stack
	st	%r2,SP_ORIG_R2(%r15)	# store original content of gpr 2
167
	icm	%r12,12,__LC_SVC_ILC
L
Linus Torvalds 已提交
168
	stm	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
169
	st	%r12,SP_ILC(%r15)
L
Linus Torvalds 已提交
170 171 172 173 174
	mvc	SP_R12(16,%r15),\savearea # move %r12-%r15 to stack
	la	%r12,0
	st	%r12,__SF_BACKCHAIN(%r15)	# clear back chain
	.endm

H
Heiko Carstens 已提交
175
	.macro	RESTORE_ALL psworg,sync
176
	mvc	\psworg(8),SP_PSW(%r15) # move user PSW to lowcore
L
Linus Torvalds 已提交
177
	.if !\sync
178
	ni	\psworg+1,0xfd		# clear wait state bit
L
Linus Torvalds 已提交
179 180
	.endif
	lm	%r0,%r15,SP_R0(%r15)	# load gprs 0-15 of user
M
Martin Schwidefsky 已提交
181
	stpt	__LC_EXIT_TIMER
182
	lpsw	\psworg			# back to caller
L
Linus Torvalds 已提交
183 184
	.endm

185 186 187 188 189 190
	.macro REENABLE_IRQS
	mvc	__SF_EMPTY(1,%r15),SP_PSW(%r15)
	ni	__SF_EMPTY(%r15),0xbf
	ssm	__SF_EMPTY(%r15)
	.endm

L
Linus Torvalds 已提交
191 192 193 194 195 196 197
/*
 * Scheduler resume function, called by switch_to
 *  gpr2 = (task_struct *) prev
 *  gpr3 = (task_struct *) next
 * Returns:
 *  gpr2 = prev
 */
H
Heiko Carstens 已提交
198
	.globl	__switch_to
L
Linus Torvalds 已提交
199
__switch_to:
H
Heiko Carstens 已提交
200
	basr	%r1,0
L
Linus Torvalds 已提交
201 202 203
__switch_to_base:
	tm	__THREAD_per(%r3),0xe8		# new process is using per ?
	bz	__switch_to_noper-__switch_to_base(%r1)	# if not we're fine
H
Heiko Carstens 已提交
204 205 206 207
	stctl	%c9,%c11,__SF_EMPTY(%r15)	# We are using per stuff
	clc	__THREAD_per(12,%r3),__SF_EMPTY(%r15)
	be	__switch_to_noper-__switch_to_base(%r1)	# we got away w/o bashing TLB's
	lctl	%c9,%c11,__THREAD_per(%r3)	# Nope we didn't
L
Linus Torvalds 已提交
208
__switch_to_noper:
209 210 211 212 213 214 215
	l	%r4,__THREAD_info(%r2)		# get thread_info of prev
	tm	__TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
	bz	__switch_to_no_mcck-__switch_to_base(%r1)
	ni	__TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
	l	%r4,__THREAD_info(%r3)		# get thread_info of next
	oi	__TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
__switch_to_no_mcck:
H
Heiko Carstens 已提交
216
	stm	%r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
L
Linus Torvalds 已提交
217 218 219 220 221
	st	%r15,__THREAD_ksp(%r2)	# store kernel stack to prev->tss.ksp
	l	%r15,__THREAD_ksp(%r3)	# load kernel stack from next->tss.ksp
	lm	%r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
	st	%r3,__LC_CURRENT	# __LC_CURRENT = current task struct
	lctl	%c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
H
Heiko Carstens 已提交
222
	l	%r3,__THREAD_info(%r3)	# load thread_info from task struct
L
Linus Torvalds 已提交
223 224 225 226 227 228 229 230 231 232 233
	st	%r3,__LC_THREAD_INFO
	ahi	%r3,STACK_SIZE
	st	%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.
 */

H
Heiko Carstens 已提交
234
	.globl	system_call
L
Linus Torvalds 已提交
235
system_call:
M
Martin Schwidefsky 已提交
236
	stpt	__LC_SYNC_ENTER_TIMER
L
Linus Torvalds 已提交
237 238
sysc_saveall:
	SAVE_ALL_BASE __LC_SAVE_AREA
239
	SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
240
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
L
Linus Torvalds 已提交
241 242 243 244 245 246 247 248 249
	lh	%r7,0x8a	  # get svc number from lowcore
sysc_vtime:
	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
sysc_do_svc:
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
250
	ltr	%r7,%r7			# test for svc 0
H
Heiko Carstens 已提交
251
	bnz	BASED(sysc_nr_ok)	# svc number > 0
L
Linus Torvalds 已提交
252 253 254
	# svc 0: system call number in %r1
	cl	%r1,BASED(.Lnr_syscalls)
	bnl	BASED(sysc_nr_ok)
H
Heiko Carstens 已提交
255
	lr	%r7,%r1 	  # copy svc number to %r7
L
Linus Torvalds 已提交
256 257 258
sysc_nr_ok:
	mvc	SP_ARGS(4,%r15),SP_R7(%r15)
sysc_do_restart:
259 260
	sth	%r7,SP_SVCNR(%r15)
	sll	%r7,2		  # svc number *4
261
	l	%r8,BASED(.Lsysc_table)
262
	tm	__TI_flags+2(%r9),_TIF_SYSCALL
263
	l	%r8,0(%r7,%r8)	  # get system call addr.
H
Heiko Carstens 已提交
264 265 266
	bnz	BASED(sysc_tracesys)
	basr	%r14,%r8	  # call sys_xxxx
	st	%r2,SP_R2(%r15)   # store return value (change R2 on stack)
L
Linus Torvalds 已提交
267 268

sysc_return:
269 270
	LOCKDEP_SYS_EXIT
sysc_tif:
L
Linus Torvalds 已提交
271 272
	tm	__TI_flags+3(%r9),_TIF_WORK_SVC
	bnz	BASED(sysc_work)  # there is work to do (signals etc.)
273
sysc_restore:
H
Heiko Carstens 已提交
274
	RESTORE_ALL __LC_RETURN_PSW,1
275 276
sysc_done:

L
Linus Torvalds 已提交
277
#
278
# There is work to do, but first we need to check if we return to userspace.
L
Linus Torvalds 已提交
279 280
#
sysc_work:
281 282
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
	bno	BASED(sysc_restore)
283 284 285 286

#
# One of the work bits is on. Find out which one.
#
287
sysc_work_tif:
288 289
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
	bo	BASED(sysc_mcck_pending)
L
Linus Torvalds 已提交
290 291
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bo	BASED(sysc_reschedule)
292
	tm	__TI_flags+3(%r9),_TIF_SIGPENDING
293
	bo	BASED(sysc_sigpending)
M
Martin Schwidefsky 已提交
294
	tm	__TI_flags+3(%r9),_TIF_NOTIFY_RESUME
295
	bo	BASED(sysc_notify_resume)
L
Linus Torvalds 已提交
296 297 298 299
	tm	__TI_flags+3(%r9),_TIF_RESTART_SVC
	bo	BASED(sysc_restart)
	tm	__TI_flags+3(%r9),_TIF_SINGLE_STEP
	bo	BASED(sysc_singlestep)
300
	b	BASED(sysc_return)	# beware of critical section cleanup
L
Linus Torvalds 已提交
301 302 303

#
# _TIF_NEED_RESCHED is set, call schedule
H
Heiko Carstens 已提交
304 305 306
#
sysc_reschedule:
	l	%r1,BASED(.Lschedule)
307
	la	%r14,BASED(sysc_return)
H
Heiko Carstens 已提交
308
	br	%r1			# call scheduler
L
Linus Torvalds 已提交
309

310 311 312 313 314
#
# _TIF_MCCK_PENDING is set, call handler
#
sysc_mcck_pending:
	l	%r1,BASED(.Ls390_handle_mcck)
315
	la	%r14,BASED(sysc_return)
316 317
	br	%r1			# TIF bit will be cleared by handler

L
Linus Torvalds 已提交
318
#
319
# _TIF_SIGPENDING is set, call do_signal
L
Linus Torvalds 已提交
320
#
H
Heiko Carstens 已提交
321
sysc_sigpending:
L
Linus Torvalds 已提交
322
	ni	__TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
H
Heiko Carstens 已提交
323 324 325
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	l	%r1,BASED(.Ldo_signal)
	basr	%r14,%r1		# call do_signal
L
Linus Torvalds 已提交
326 327 328 329
	tm	__TI_flags+3(%r9),_TIF_RESTART_SVC
	bo	BASED(sysc_restart)
	tm	__TI_flags+3(%r9),_TIF_SINGLE_STEP
	bo	BASED(sysc_singlestep)
330
	b	BASED(sysc_return)
L
Linus Torvalds 已提交
331

M
Martin Schwidefsky 已提交
332 333 334 335 336 337
#
# _TIF_NOTIFY_RESUME is set, call do_notify_resume
#
sysc_notify_resume:
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	l	%r1,BASED(.Ldo_notify_resume)
338
	la	%r14,BASED(sysc_return)
M
Martin Schwidefsky 已提交
339 340 341
	br	%r1			# call do_notify_resume


L
Linus Torvalds 已提交
342 343 344 345 346
#
# _TIF_RESTART_SVC is set, set up registers and restart svc
#
sysc_restart:
	ni	__TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
H
Heiko Carstens 已提交
347
	l	%r7,SP_R2(%r15) 	# load new svc number
L
Linus Torvalds 已提交
348
	mvc	SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
H
Heiko Carstens 已提交
349 350
	lm	%r2,%r6,SP_R2(%r15)	# load svc arguments
	b	BASED(sysc_do_restart)	# restart svc
L
Linus Torvalds 已提交
351 352 353 354 355 356

#
# _TIF_SINGLE_STEP is set, call do_single_step
#
sysc_singlestep:
	ni	__TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
357 358
	mvi	SP_SVCNR(%r15),0xff	# set trap indication to pgm check
	mvi	SP_SVCNR+1(%r15),0xff
L
Linus Torvalds 已提交
359 360
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	l	%r1,BASED(.Lhandle_per)	# load adr. of per handler
361
	la	%r14,BASED(sysc_return)	# load adr. of system return
L
Linus Torvalds 已提交
362 363 364
	br	%r1			# branch to do_single_step

#
M
Martin Schwidefsky 已提交
365 366
# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
# and after the system call
L
Linus Torvalds 已提交
367 368
#
sysc_tracesys:
M
Martin Schwidefsky 已提交
369
	l	%r1,BASED(.Ltrace_entry)
H
Heiko Carstens 已提交
370
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
L
Linus Torvalds 已提交
371 372 373 374
	la	%r3,0
	srl	%r7,2
	st	%r7,SP_R2(%r15)
	basr	%r14,%r1
M
Martin Schwidefsky 已提交
375
	cl	%r2,BASED(.Lnr_syscalls)
L
Linus Torvalds 已提交
376
	bnl	BASED(sysc_tracenogo)
377
	l	%r8,BASED(.Lsysc_table)
M
Martin Schwidefsky 已提交
378
	lr	%r7,%r2
379
	sll	%r7,2			# svc number *4
380
	l	%r8,0(%r7,%r8)
L
Linus Torvalds 已提交
381 382 383
sysc_tracego:
	lm	%r3,%r6,SP_R3(%r15)
	l	%r2,SP_ORIG_R2(%r15)
H
Heiko Carstens 已提交
384 385
	basr	%r14,%r8		# call sys_xxx
	st	%r2,SP_R2(%r15)		# store return value
L
Linus Torvalds 已提交
386
sysc_tracenogo:
387
	tm	__TI_flags+2(%r9),_TIF_SYSCALL
H
Heiko Carstens 已提交
388
	bz	BASED(sysc_return)
M
Martin Schwidefsky 已提交
389
	l	%r1,BASED(.Ltrace_exit)
H
Heiko Carstens 已提交
390
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
L
Linus Torvalds 已提交
391 392 393 394 395 396
	la	%r14,BASED(sysc_return)
	br	%r1

#
# a new process exits the kernel with ret_from_fork
#
H
Heiko Carstens 已提交
397
	.globl	ret_from_fork
L
Linus Torvalds 已提交
398 399 400 401 402 403
ret_from_fork:
	l	%r13,__LC_SVC_NEW_PSW+4
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	tm	SP_PSW+1(%r15),0x01	# forking a kernel thread ?
	bo	BASED(0f)
	st	%r15,SP_R15(%r15)	# store stack pointer for new kthread
H
Heiko Carstens 已提交
404 405
0:	l	%r1,BASED(.Lschedtail)
	basr	%r14,%r1
406
	TRACE_IRQS_ON
H
Heiko Carstens 已提交
407
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
408
	b	BASED(sysc_tracenogo)
L
Linus Torvalds 已提交
409 410

#
M
Martin Schwidefsky 已提交
411 412
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
L
Linus Torvalds 已提交
413
#
M
Martin Schwidefsky 已提交
414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441
	.globl	kernel_execve
kernel_execve:
	stm	%r12,%r15,48(%r15)
	lr	%r14,%r15
	l	%r13,__LC_SVC_NEW_PSW+4
	s	%r15,BASED(.Lc_spsize)
	st	%r14,__SF_BACKCHAIN(%r15)
	la	%r12,SP_PTREGS(%r15)
	xc	0(__PT_SIZE,%r12),0(%r12)
	l	%r1,BASED(.Ldo_execve)
	lr	%r5,%r12
	basr	%r14,%r1
	ltr	%r2,%r2
	be	BASED(0f)
	a	%r15,BASED(.Lc_spsize)
	lm	%r12,%r15,48(%r15)
	br	%r14
	# execve succeeded.
0:	stnsm	__SF_EMPTY(%r15),0xfc	# disable interrupts
	l	%r15,__LC_KERNEL_STACK	# load ksp
	s	%r15,BASED(.Lc_spsize)	# make room for registers & psw
	l	%r9,__LC_THREAD_INFO
	mvc	SP_PTREGS(__PT_SIZE,%r15),0(%r12)	# copy pt_regs
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	l	%r1,BASED(.Lexecve_tail)
	basr	%r14,%r1
	b	BASED(sysc_return)
L
Linus Torvalds 已提交
442 443 444 445 446

/*
 * Program check handler routine
 */

H
Heiko Carstens 已提交
447
	.globl	pgm_check_handler
L
Linus Torvalds 已提交
448 449 450 451 452 453 454 455 456 457 458 459 460 461
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?).
 */
M
Martin Schwidefsky 已提交
462
	stpt	__LC_SYNC_ENTER_TIMER
L
Linus Torvalds 已提交
463
	SAVE_ALL_BASE __LC_SAVE_AREA
H
Heiko Carstens 已提交
464 465
	tm	__LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
	bnz	BASED(pgm_per)		# got per exception -> special case
466
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
467
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
L
Linus Torvalds 已提交
468 469 470 471 472 473 474
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	bz	BASED(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:
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
H
Heiko Carstens 已提交
475
	l	%r3,__LC_PGM_ILC	# load program interruption code
476 477
	l	%r4,__LC_TRANS_EXC_CODE
	REENABLE_IRQS
L
Linus Torvalds 已提交
478 479 480
	la	%r8,0x7f
	nr	%r8,%r3
pgm_do_call:
H
Heiko Carstens 已提交
481 482 483 484
	l	%r7,BASED(.Ljump_table)
	sll	%r8,2
	l	%r7,0(%r8,%r7)		# load address of handler routine
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
485 486 487
	basr	%r14,%r7		# branch to interrupt-handler
pgm_exit:
	b	BASED(sysc_return)
L
Linus Torvalds 已提交
488 489 490 491 492

#
# handle per exception
#
pgm_per:
H
Heiko Carstens 已提交
493 494
	tm	__LC_PGM_OLD_PSW,0x40	# test if per event recording is on
	bnz	BASED(pgm_per_std)	# ok, normal per event from user space
L
Linus Torvalds 已提交
495
# ok its one of the special cases, now we need to find out which one
H
Heiko Carstens 已提交
496 497
	clc	__LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW
	be	BASED(pgm_svcper)
L
Linus Torvalds 已提交
498
# no interesting special case, ignore PER event
H
Heiko Carstens 已提交
499 500
	lm	%r12,%r15,__LC_SAVE_AREA
	lpsw	0x28
L
Linus Torvalds 已提交
501 502 503 504 505

#
# Normal per exception
#
pgm_per_std:
506
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
507
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
L
Linus Torvalds 已提交
508 509 510 511 512 513 514 515
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	bz	BASED(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:
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	l	%r1,__TI_task(%r9)
516 517
	tm	SP_PSW+1(%r15),0x01	# kernel per event ?
	bz	BASED(kernel_per)
L
Linus Torvalds 已提交
518 519 520 521
	mvc	__THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
	mvc	__THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
	mvc	__THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
	oi	__TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
H
Heiko Carstens 已提交
522
	l	%r3,__LC_PGM_ILC	# load program interruption code
523 524
	l	%r4,__LC_TRANS_EXC_CODE
	REENABLE_IRQS
L
Linus Torvalds 已提交
525
	la	%r8,0x7f
H
Heiko Carstens 已提交
526
	nr	%r8,%r3 		# clear per-event-bit and ilc
527 528 529 530 531 532 533 534
	be	BASED(pgm_exit2)	# only per or per+check ?
	l	%r7,BASED(.Ljump_table)
	sll	%r8,2
	l	%r7,0(%r8,%r7)		# load address of handler routine
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	basr	%r14,%r7		# branch to interrupt-handler
pgm_exit2:
	b	BASED(sysc_return)
L
Linus Torvalds 已提交
535 536 537 538 539

#
# it was a single stepped SVC that is causing all the trouble
#
pgm_svcper:
540
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
541
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
L
Linus Torvalds 已提交
542 543 544 545 546
	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
	lh	%r7,0x8a		# get svc number from lowcore
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
547 548 549 550
	l	%r8,__TI_task(%r9)
	mvc	__THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
	mvc	__THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS
	mvc	__THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
L
Linus Torvalds 已提交
551 552
	oi	__TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
553
	lm	%r2,%r6,SP_R2(%r15)	# load svc arguments
L
Linus Torvalds 已提交
554 555
	b	BASED(sysc_do_svc)

M
Michael Grundy 已提交
556 557 558 559
#
# per was called from kernel, must be kprobes
#
kernel_per:
560 561
	mvi	SP_SVCNR(%r15),0xff	# set trap indication to pgm check
	mvi	SP_SVCNR+1(%r15),0xff
M
Michael Grundy 已提交
562 563
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	l	%r1,BASED(.Lhandle_per)	# load adr. of per handler
564 565
	basr	%r14,%r1		# branch to do_single_step
	b	BASED(pgm_exit)
M
Michael Grundy 已提交
566

L
Linus Torvalds 已提交
567 568 569 570
/*
 * IO interrupt handler routine
 */

H
Heiko Carstens 已提交
571
	.globl io_int_handler
L
Linus Torvalds 已提交
572 573
io_int_handler:
	stck	__LC_INT_CLOCK
574
	stpt	__LC_ASYNC_ENTER_TIMER
L
Linus Torvalds 已提交
575
	SAVE_ALL_BASE __LC_SAVE_AREA+16
576
	SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
577
	CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
L
Linus Torvalds 已提交
578 579 580 581 582 583
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	bz	BASED(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:
584
	TRACE_IRQS_OFF
585
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
H
Heiko Carstens 已提交
586 587 588
	l	%r1,BASED(.Ldo_IRQ)	# load address of do_IRQ
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	basr	%r14,%r1		# branch to standard irq handler
L
Linus Torvalds 已提交
589
io_return:
590 591 592
	LOCKDEP_SYS_EXIT
	TRACE_IRQS_ON
io_tif:
L
Linus Torvalds 已提交
593
	tm	__TI_flags+3(%r9),_TIF_WORK_INT
H
Heiko Carstens 已提交
594
	bnz	BASED(io_work)		# there is work to do (signals etc.)
595
io_restore:
H
Heiko Carstens 已提交
596
	RESTORE_ALL __LC_RETURN_PSW,0
597
io_done:
L
Linus Torvalds 已提交
598

599
#
600 601 602 603 604
# 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.
605 606 607
#
io_work:
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
608 609
	bo	BASED(io_work_user)	# yes -> do resched & signal
#ifdef CONFIG_PREEMPT
610
	# check for preemptive scheduling
L
Linus Torvalds 已提交
611
	icm	%r0,15,__TI_precount(%r9)
612
	bnz	BASED(io_restore)	# preemption disabled
613 614
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bno	BASED(io_restore)
615
	# switch to kernel stack
L
Linus Torvalds 已提交
616 617 618
	l	%r1,SP_R15(%r15)
	s	%r1,BASED(.Lc_spsize)
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
H
Heiko Carstens 已提交
619
	xc	__SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
L
Linus Torvalds 已提交
620
	lr	%r15,%r1
621 622 623
	# TRACE_IRQS_ON already done at io_return, call
	# TRACE_IRQS_OFF to keep things symmetrical
	TRACE_IRQS_OFF
H
Heiko Carstens 已提交
624
	l	%r1,BASED(.Lpreempt_schedule_irq)
625 626 627
	basr	%r14,%r1		# call preempt_schedule_irq
	b	BASED(io_return)
#else
628
	b	BASED(io_restore)
629
#endif
L
Linus Torvalds 已提交
630

631 632 633
#
# Need to do work before returning to userspace, switch to kernel stack
#
634
io_work_user:
L
Linus Torvalds 已提交
635 636 637
	l	%r1,__LC_KERNEL_STACK
	s	%r1,BASED(.Lc_spsize)
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
H
Heiko Carstens 已提交
638
	xc	__SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
L
Linus Torvalds 已提交
639
	lr	%r15,%r1
640

L
Linus Torvalds 已提交
641 642
#
# One of the work bits is on. Find out which one.
643
# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED
H
Heiko Carstens 已提交
644
#		and _TIF_MCCK_PENDING
L
Linus Torvalds 已提交
645
#
646
io_work_tif:
647
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
H
Heiko Carstens 已提交
648
	bo	BASED(io_mcck_pending)
L
Linus Torvalds 已提交
649 650
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bo	BASED(io_reschedule)
651
	tm	__TI_flags+3(%r9),_TIF_SIGPENDING
652
	bo	BASED(io_sigpending)
M
Martin Schwidefsky 已提交
653
	tm	__TI_flags+3(%r9),_TIF_NOTIFY_RESUME
654 655
	bo	BASED(io_notify_resume)
	b	BASED(io_return)	# beware of critical section cleanup
L
Linus Torvalds 已提交
656

657 658 659 660
#
# _TIF_MCCK_PENDING is set, call handler
#
io_mcck_pending:
661
	# TRACE_IRQS_ON already done at io_return
662
	l	%r1,BASED(.Ls390_handle_mcck)
H
Heiko Carstens 已提交
663
	basr	%r14,%r1		# TIF bit will be cleared by handler
664 665
	TRACE_IRQS_OFF
	b	BASED(io_return)
666

L
Linus Torvalds 已提交
667 668
#
# _TIF_NEED_RESCHED is set, call schedule
H
Heiko Carstens 已提交
669 670
#
io_reschedule:
671
	# TRACE_IRQS_ON already done at io_return
H
Heiko Carstens 已提交
672 673 674 675
	l	%r1,BASED(.Lschedule)
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	basr	%r14,%r1		# call scheduler
	stnsm	__SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
676
	TRACE_IRQS_OFF
677
	b	BASED(io_return)
L
Linus Torvalds 已提交
678 679

#
680
# _TIF_SIGPENDING is set, call do_signal
L
Linus Torvalds 已提交
681
#
H
Heiko Carstens 已提交
682
io_sigpending:
683
	# TRACE_IRQS_ON already done at io_return
H
Heiko Carstens 已提交
684 685 686 687 688
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	l	%r1,BASED(.Ldo_signal)
	basr	%r14,%r1		# call do_signal
	stnsm	__SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
689
	TRACE_IRQS_OFF
690
	b	BASED(io_return)
L
Linus Torvalds 已提交
691

M
Martin Schwidefsky 已提交
692 693 694 695
#
# _TIF_SIGPENDING is set, call do_signal
#
io_notify_resume:
696
	# TRACE_IRQS_ON already done at io_return
M
Martin Schwidefsky 已提交
697 698 699 700 701 702
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	l	%r1,BASED(.Ldo_notify_resume)
	basr	%r14,%r1		# call do_signal
	stnsm	__SF_EMPTY(%r15),0xfc	# disable I/O and ext. interrupts
	TRACE_IRQS_OFF
703
	b	BASED(io_return)
M
Martin Schwidefsky 已提交
704

L
Linus Torvalds 已提交
705 706 707 708
/*
 * External interrupt handler routine
 */

H
Heiko Carstens 已提交
709
	.globl	ext_int_handler
L
Linus Torvalds 已提交
710 711
ext_int_handler:
	stck	__LC_INT_CLOCK
712
	stpt	__LC_ASYNC_ENTER_TIMER
L
Linus Torvalds 已提交
713
	SAVE_ALL_BASE __LC_SAVE_AREA+16
714
	SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
715
	CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
L
Linus Torvalds 已提交
716 717 718 719 720 721 722
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	bz	BASED(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:
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
723
	TRACE_IRQS_OFF
H
Heiko Carstens 已提交
724
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
725 726
	l	%r3,__LC_CPU_ADDRESS	# get cpu address + interruption code
	l	%r4,__LC_EXT_PARAMS	# get external parameters
L
Linus Torvalds 已提交
727 728 729 730
	l	%r1,BASED(.Ldo_extint)
	basr	%r14,%r1
	b	BASED(io_return)

731 732
__critical_end:

L
Linus Torvalds 已提交
733 734 735 736
/*
 * Machine check handler routines
 */

H
Heiko Carstens 已提交
737
	.globl mcck_int_handler
L
Linus Torvalds 已提交
738
mcck_int_handler:
739
	stck	__LC_MCCK_CLOCK
740 741
	spt	__LC_CPU_TIMER_SAVE_AREA	# revalidate cpu timer
	lm	%r0,%r15,__LC_GPREGS_SAVE_AREA	# revalidate gprs
L
Linus Torvalds 已提交
742
	SAVE_ALL_BASE __LC_SAVE_AREA+32
743
	la	%r12,__LC_MCK_OLD_PSW
H
Heiko Carstens 已提交
744
	tm	__LC_MCCK_CODE,0x80	# system damage?
745
	bo	BASED(mcck_int_main)	# yes -> rest of mcck code invalid
746
	mvc	__LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
747 748 749 750 751 752 753 754 755 756 757 758 759
	tm	__LC_MCCK_CODE+5,0x02	# stored cpu timer value valid?
	bo	BASED(1f)
	la	%r14,__LC_SYNC_ENTER_TIMER
	clc	0(8,%r14),__LC_ASYNC_ENTER_TIMER
	bl	BASED(0f)
	la	%r14,__LC_ASYNC_ENTER_TIMER
0:	clc	0(8,%r14),__LC_EXIT_TIMER
	bl	BASED(0f)
	la	%r14,__LC_EXIT_TIMER
0:	clc	0(8,%r14),__LC_LAST_UPDATE_TIMER
	bl	BASED(0f)
	la	%r14,__LC_LAST_UPDATE_TIMER
0:	spt	0(%r14)
760
	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
M
Martin Schwidefsky 已提交
761
1:	tm	__LC_MCCK_CODE+2,0x09	# mwp + ia of old psw valid?
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777
	bno	BASED(mcck_int_main)	# no -> skip cleanup critical
	tm	__LC_MCK_OLD_PSW+1,0x01	# test problem state bit
	bnz	BASED(mcck_int_main)	# from user -> load async stack
	clc	__LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end)
	bhe	BASED(mcck_int_main)
	clc	__LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start)
	bl	BASED(mcck_int_main)
	l	%r14,BASED(.Lcleanup_critical)
	basr	%r14,%r14
mcck_int_main:
	l	%r14,__LC_PANIC_STACK	# are we already on the panic stack?
	slr	%r14,%r15
	sra	%r14,PAGE_SHIFT
	be	BASED(0f)
	l	%r15,__LC_PANIC_STACK	# load panic stack
0:	CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
H
Heiko Carstens 已提交
778
	tm	__LC_MCCK_CODE+2,0x08	# mwp of old psw valid?
779
	bno	BASED(mcck_no_vtime)	# no -> skip cleanup critical
780
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
781
	bz	BASED(mcck_no_vtime)
782
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER
783
	UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
784
	mvc	__LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER
785
mcck_no_vtime:
786 787
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
H
Heiko Carstens 已提交
788 789 790
	l	%r1,BASED(.Ls390_mcck)
	basr	%r14,%r1		# call machine check handler
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
791
	bno	BASED(mcck_return)
H
Heiko Carstens 已提交
792
	l	%r1,__LC_KERNEL_STACK	# switch to kernel stack
793 794
	s	%r1,BASED(.Lc_spsize)
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
H
Heiko Carstens 已提交
795
	xc	__SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
796 797 798 799
	lr	%r15,%r1
	stosm	__SF_EMPTY(%r15),0x04	# turn dat on
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
	bno	BASED(mcck_return)
800
	TRACE_IRQS_OFF
801 802
	l	%r1,BASED(.Ls390_handle_mcck)
	basr	%r14,%r1		# call machine check handler
803
	TRACE_IRQS_ON
L
Linus Torvalds 已提交
804
mcck_return:
805 806 807 808 809 810 811
	mvc	__LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW
	ni	__LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
	tm	__LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
	bno	BASED(0f)
	lm	%r0,%r15,SP_R0(%r15)	# load gprs 0-15
	stpt	__LC_EXIT_TIMER
	lpsw	__LC_RETURN_MCCK_PSW	# back to caller
M
Martin Schwidefsky 已提交
812
0:	lm	%r0,%r15,SP_R0(%r15)	# load gprs 0-15
813 814
	lpsw	__LC_RETURN_MCCK_PSW	# back to caller

H
Heiko Carstens 已提交
815
	RESTORE_ALL __LC_RETURN_MCCK_PSW,0
L
Linus Torvalds 已提交
816 817 818 819

/*
 * Restart interruption handler, kick starter for additional CPUs
 */
820
#ifdef CONFIG_SMP
821
	__CPUINIT
H
Heiko Carstens 已提交
822
	.globl restart_int_handler
L
Linus Torvalds 已提交
823
restart_int_handler:
824 825 826 827 828 829
	basr	%r1,0
restart_base:
	spt	restart_vtime-restart_base(%r1)
	stck	__LC_LAST_UPDATE_CLOCK
	mvc	__LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
	mvc	__LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
H
Heiko Carstens 已提交
830 831 832 833
	l	%r15,__LC_SAVE_AREA+60	# load ksp
	lctl	%c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
	lam	%a0,%a15,__LC_AREGS_SAVE_AREA
	lm	%r6,%r15,__SF_GPRS(%r15) # load registers from clone
834 835 836 837
	l	%r1,__LC_THREAD_INFO
	mvc	__LC_USER_TIMER(8),__TI_user_timer(%r1)
	mvc	__LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
	xc	__LC_STEAL_TIMER(8),__LC_STEAL_TIMER
H
Heiko Carstens 已提交
838 839 840 841
	stosm	__SF_EMPTY(%r15),0x04	# now we can turn dat on
	basr	%r14,0
	l	%r14,restart_addr-.(%r14)
	br	%r14			# branch to start_secondary
L
Linus Torvalds 已提交
842
restart_addr:
H
Heiko Carstens 已提交
843
	.long	start_secondary
844 845 846
	.align	8
restart_vtime:
	.long	0x7fffffff,0xffffffff
847
	.previous
L
Linus Torvalds 已提交
848 849 850 851
#else
/*
 * If we do not run with SMP enabled, let the new CPU crash ...
 */
H
Heiko Carstens 已提交
852
	.globl restart_int_handler
L
Linus Torvalds 已提交
853
restart_int_handler:
H
Heiko Carstens 已提交
854
	basr	%r1,0
L
Linus Torvalds 已提交
855
restart_base:
H
Heiko Carstens 已提交
856 857
	lpsw	restart_crash-restart_base(%r1)
	.align	8
L
Linus Torvalds 已提交
858
restart_crash:
H
Heiko Carstens 已提交
859
	.long	0x000a0000,0x00000000
L
Linus Torvalds 已提交
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
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:
	l	%r15,__LC_PANIC_STACK	# change to panic stack
	sl	%r15,BASED(.Lc_spsize)
	mvc	SP_PSW(8,%r15),0(%r12)	# move user PSW to stack
	stm	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
	la	%r1,__LC_SAVE_AREA
	ch	%r12,BASED(.L0x020)	# old psw addr == __LC_SVC_OLD_PSW ?
	be	BASED(0f)
	ch	%r12,BASED(.L0x028)	# old psw addr == __LC_PGM_OLD_PSW ?
	be	BASED(0f)
	la	%r1,__LC_SAVE_AREA+16
0:	mvc	SP_R12(16,%r15),0(%r1)	# move %r12-%r15 to stack
H
Heiko Carstens 已提交
881
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
L
Linus Torvalds 已提交
882
	l	%r1,BASED(1f)		# branch to kernel_stack_overflow
H
Heiko Carstens 已提交
883
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
L
Linus Torvalds 已提交
884
	br	%r1
H
Heiko Carstens 已提交
885
1:	.long	kernel_stack_overflow
L
Linus Torvalds 已提交
886 887 888 889
#endif

cleanup_table_system_call:
	.long	system_call + 0x80000000, sysc_do_svc + 0x80000000
890 891 892 893 894 895 896 897
cleanup_table_sysc_tif:
	.long	sysc_tif + 0x80000000, sysc_restore + 0x80000000
cleanup_table_sysc_restore:
	.long	sysc_restore + 0x80000000, sysc_done + 0x80000000
cleanup_table_io_tif:
	.long	io_tif + 0x80000000, io_restore + 0x80000000
cleanup_table_io_restore:
	.long	io_restore + 0x80000000, io_done + 0x80000000
L
Linus Torvalds 已提交
898 899 900 901 902 903 904

cleanup_critical:
	clc	4(4,%r12),BASED(cleanup_table_system_call)
	bl	BASED(0f)
	clc	4(4,%r12),BASED(cleanup_table_system_call+4)
	bl	BASED(cleanup_system_call)
0:
905
	clc	4(4,%r12),BASED(cleanup_table_sysc_tif)
L
Linus Torvalds 已提交
906
	bl	BASED(0f)
907 908
	clc	4(4,%r12),BASED(cleanup_table_sysc_tif+4)
	bl	BASED(cleanup_sysc_tif)
L
Linus Torvalds 已提交
909
0:
910
	clc	4(4,%r12),BASED(cleanup_table_sysc_restore)
L
Linus Torvalds 已提交
911
	bl	BASED(0f)
912 913
	clc	4(4,%r12),BASED(cleanup_table_sysc_restore+4)
	bl	BASED(cleanup_sysc_restore)
914
0:
915
	clc	4(4,%r12),BASED(cleanup_table_io_tif)
916
	bl	BASED(0f)
917 918
	clc	4(4,%r12),BASED(cleanup_table_io_tif+4)
	bl	BASED(cleanup_io_tif)
919
0:
920
	clc	4(4,%r12),BASED(cleanup_table_io_restore)
921
	bl	BASED(0f)
922 923
	clc	4(4,%r12),BASED(cleanup_table_io_restore+4)
	bl	BASED(cleanup_io_restore)
L
Linus Torvalds 已提交
924 925 926 927 928 929 930
0:
	br	%r14

cleanup_system_call:
	mvc	__LC_RETURN_PSW(8),0(%r12)
	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
	bh	BASED(0f)
931 932 933
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
	c	%r12,BASED(.Lmck_old_psw)
	be	BASED(0f)
L
Linus Torvalds 已提交
934
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
935 936 937 938
0:	c	%r12,BASED(.Lmck_old_psw)
	la	%r12,__LC_SAVE_AREA+32
	be	BASED(0f)
	la	%r12,__LC_SAVE_AREA+16
L
Linus Torvalds 已提交
939 940 941 942
0:	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8)
	bhe	BASED(cleanup_vtime)
	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
	bh	BASED(0f)
943 944 945
	mvc	__LC_SAVE_AREA(16),0(%r12)
0:	st	%r13,4(%r12)
	st	%r12,__LC_SAVE_AREA+48	# argh
946
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
947
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
948 949
	l	%r12,__LC_SAVE_AREA+48	# argh
	st	%r15,12(%r12)
L
Linus Torvalds 已提交
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965
	lh	%r7,0x8a
cleanup_vtime:
	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
	bhe	BASED(cleanup_stime)
	UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
cleanup_stime:
	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16)
	bh	BASED(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
	mvc	__LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4)
	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_system_call_insn:
	.long	sysc_saveall + 0x80000000
H
Heiko Carstens 已提交
966 967 968 969
	.long	system_call + 0x80000000
	.long	sysc_vtime + 0x80000000
	.long	sysc_stime + 0x80000000
	.long	sysc_update + 0x80000000
L
Linus Torvalds 已提交
970

971
cleanup_sysc_tif:
L
Linus Torvalds 已提交
972
	mvc	__LC_RETURN_PSW(4),0(%r12)
973
	mvc	__LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif)
L
Linus Torvalds 已提交
974 975 976
	la	%r12,__LC_RETURN_PSW
	br	%r14

977 978
cleanup_sysc_restore:
	clc	4(4,%r12),BASED(cleanup_sysc_restore_insn)
979
	be	BASED(2f)
980 981 982
	mvc	__LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
	c	%r12,BASED(.Lmck_old_psw)
	be	BASED(0f)
L
Linus Torvalds 已提交
983
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
984
0:	clc	4(4,%r12),BASED(cleanup_sysc_restore_insn+4)
985
	be	BASED(2f)
L
Linus Torvalds 已提交
986
	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15)
987
	c	%r12,BASED(.Lmck_old_psw)
988 989 990 991 992
	la	%r12,__LC_SAVE_AREA+32
	be	BASED(1f)
	la	%r12,__LC_SAVE_AREA+16
1:	mvc	0(16,%r12),SP_R12(%r15)
	lm	%r0,%r11,SP_R0(%r15)
L
Linus Torvalds 已提交
993
	l	%r15,SP_R15(%r15)
994
2:	la	%r12,__LC_RETURN_PSW
L
Linus Torvalds 已提交
995
	br	%r14
996
cleanup_sysc_restore_insn:
997 998
	.long	sysc_done - 4 + 0x80000000
	.long	sysc_done - 8 + 0x80000000
L
Linus Torvalds 已提交
999

1000
cleanup_io_tif:
1001
	mvc	__LC_RETURN_PSW(4),0(%r12)
1002
	mvc	__LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif)
1003 1004 1005
	la	%r12,__LC_RETURN_PSW
	br	%r14

1006 1007
cleanup_io_restore:
	clc	4(4,%r12),BASED(cleanup_io_restore_insn)
1008 1009
	be	BASED(1f)
	mvc	__LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
1010
	clc	4(4,%r12),BASED(cleanup_io_restore_insn+4)
1011
	be	BASED(1f)
1012 1013
	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15)
	mvc	__LC_SAVE_AREA+32(16),SP_R12(%r15)
1014
	lm	%r0,%r11,SP_R0(%r15)
1015
	l	%r15,SP_R15(%r15)
1016
1:	la	%r12,__LC_RETURN_PSW
1017
	br	%r14
1018
cleanup_io_restore_insn:
1019 1020
	.long	io_done - 4 + 0x80000000
	.long	io_done - 8 + 0x80000000
1021

L
Linus Torvalds 已提交
1022 1023 1024
/*
 * Integer constants
 */
H
Heiko Carstens 已提交
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
		.align	4
.Lc_spsize:	.long	SP_SIZE
.Lc_overhead:	.long	STACK_FRAME_OVERHEAD
.Lnr_syscalls:	.long	NR_syscalls
.L0x018:	.short	0x018
.L0x020:	.short	0x020
.L0x028:	.short	0x028
.L0x030:	.short	0x030
.L0x038:	.short	0x038
.Lc_1:		.long	1
L
Linus Torvalds 已提交
1035 1036 1037 1038

/*
 * Symbol constants
 */
H
Heiko Carstens 已提交
1039
.Ls390_mcck:	.long	s390_do_machine_check
1040
.Ls390_handle_mcck:
H
Heiko Carstens 已提交
1041 1042 1043 1044 1045
		.long	s390_handle_mcck
.Lmck_old_psw:	.long	__LC_MCK_OLD_PSW
.Ldo_IRQ:	.long	do_IRQ
.Ldo_extint:	.long	do_extint
.Ldo_signal:	.long	do_signal
M
Martin Schwidefsky 已提交
1046 1047
.Ldo_notify_resume:
		.long	do_notify_resume
H
Heiko Carstens 已提交
1048
.Lhandle_per:	.long	do_single_step
M
Martin Schwidefsky 已提交
1049 1050
.Ldo_execve:	.long	do_execve
.Lexecve_tail:	.long	execve_tail
H
Heiko Carstens 已提交
1051 1052
.Ljump_table:	.long	pgm_check_table
.Lschedule:	.long	schedule
1053
#ifdef CONFIG_PREEMPT
H
Heiko Carstens 已提交
1054 1055
.Lpreempt_schedule_irq:
		.long	preempt_schedule_irq
1056
#endif
M
Martin Schwidefsky 已提交
1057 1058
.Ltrace_entry:	.long	do_syscall_trace_enter
.Ltrace_exit:	.long	do_syscall_trace_exit
H
Heiko Carstens 已提交
1059 1060
.Lschedtail:	.long	schedule_tail
.Lsysc_table:	.long	sys_call_table
1061
#ifdef CONFIG_TRACE_IRQFLAGS
1062 1063 1064 1065
.Ltrace_irq_on_caller:
		.long	trace_hardirqs_on_caller
.Ltrace_irq_off_caller:
		.long	trace_hardirqs_off_caller
H
Heiko Carstens 已提交
1066 1067
#endif
#ifdef CONFIG_LOCKDEP
1068 1069
.Llockdep_sys_exit:
		.long	lockdep_sys_exit
1070
#endif
L
Linus Torvalds 已提交
1071
.Lcritical_start:
H
Heiko Carstens 已提交
1072
		.long	__critical_start + 0x80000000
L
Linus Torvalds 已提交
1073
.Lcritical_end:
H
Heiko Carstens 已提交
1074
		.long	__critical_end + 0x80000000
L
Linus Torvalds 已提交
1075
.Lcleanup_critical:
H
Heiko Carstens 已提交
1076
		.long	cleanup_critical
L
Linus Torvalds 已提交
1077

H
Heiko Carstens 已提交
1078
		.section .rodata, "a"
L
Linus Torvalds 已提交
1079
#define SYSCALL(esa,esame,emu)	.long esa
1080
	.globl	sys_call_table
L
Linus Torvalds 已提交
1081 1082 1083
sys_call_table:
#include "syscalls.S"
#undef SYSCALL