entry.S 30.9 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4
/*
 *  arch/s390/kernel/entry.S
 *    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 + 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
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 54
_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
55 56 57 58 59 60

STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE  = 1 << STACK_SHIFT

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

61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
#ifdef CONFIG_TRACE_IRQFLAGS
	.macro	TRACE_IRQS_ON
	l	%r1,BASED(.Ltrace_irq_on)
	basr	%r14,%r1
	.endm

	.macro	TRACE_IRQS_OFF
	l	%r1,BASED(.Ltrace_irq_off)
	basr	%r14,%r1
	.endm
#else
#define TRACE_IRQS_ON
#define TRACE_IRQS_OFF
#endif

Linus Torvalds's avatar
Linus Torvalds committed
76 77 78 79 80 81 82 83
/*
 * 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
84
	.macro	STORE_TIMER lc_offset
Linus Torvalds's avatar
Linus Torvalds committed
85 86 87 88 89 90
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	stpt	\lc_offset
#endif
	.endm

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Heiko Carstens's avatar
Heiko Carstens committed
91
	.macro	UPDATE_VTIME lc_from,lc_to,lc_sum
Linus Torvalds's avatar
Linus Torvalds committed
92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109
	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
#endif

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

110 111 112 113 114
	.macro	SAVE_ALL_SVC psworg,savearea
	la	%r12,\psworg
	l	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
	.endm

115
	.macro	SAVE_ALL_SYNC psworg,savearea
Linus Torvalds's avatar
Linus Torvalds committed
116 117 118 119
	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
120 121 122 123 124 125 126 127 128 129 130
#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
Linus Torvalds's avatar
Linus Torvalds committed
131 132 133 134 135 136 137 138
	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
139
	tm	1(%r12),0x01		# retest problem state after cleanup
Linus Torvalds's avatar
Linus Torvalds committed
140 141 142 143 144 145 146 147 148 149 150 151
	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
152 153 154
2:
	.endm

Heiko Carstens's avatar
Heiko Carstens committed
155
	.macro	CREATE_STACK_FRAME psworg,savearea
156
	s	%r15,BASED(.Lc_spsize)	# make room for registers & psw
Linus Torvalds's avatar
Linus Torvalds committed
157 158 159 160 161 162 163 164 165 166 167
	mvc	SP_PSW(8,%r15),0(%r12)	# move user PSW to stack
	la	%r12,\psworg
	st	%r2,SP_ORIG_R2(%r15)	# store original content of gpr 2
	icm	%r12,12,__LC_SVC_ILC
	stm	%r0,%r11,SP_R0(%r15)	# store gprs %r0-%r11 to kernel stack
	st	%r12,SP_ILC(%r15)
	mvc	SP_R12(16,%r15),\savearea # move %r12-%r15 to stack
	la	%r12,0
	st	%r12,__SF_BACKCHAIN(%r15)	# clear back chain
	.endm

Heiko Carstens's avatar
Heiko Carstens committed
168
	.macro	RESTORE_ALL psworg,sync
169
	mvc	\psworg(8),SP_PSW(%r15) # move user PSW to lowcore
Linus Torvalds's avatar
Linus Torvalds committed
170
	.if !\sync
171
	ni	\psworg+1,0xfd		# clear wait state bit
Linus Torvalds's avatar
Linus Torvalds committed
172 173 174
	.endif
	lm	%r0,%r15,SP_R0(%r15)	# load gprs 0-15 of user
	STORE_TIMER __LC_EXIT_TIMER
175
	lpsw	\psworg			# back to caller
Linus Torvalds's avatar
Linus Torvalds committed
176 177 178 179 180 181 182 183 184
	.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
185
	.globl	__switch_to
Linus Torvalds's avatar
Linus Torvalds committed
186
__switch_to:
Heiko Carstens's avatar
Heiko Carstens committed
187
	basr	%r1,0
Linus Torvalds's avatar
Linus Torvalds committed
188 189 190
__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
Heiko Carstens's avatar
Heiko Carstens committed
191 192 193 194
	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
Linus Torvalds's avatar
Linus Torvalds committed
195
__switch_to_noper:
196 197 198 199 200 201 202
	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:
Heiko Carstens's avatar
Heiko Carstens committed
203
	stm	%r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
Linus Torvalds's avatar
Linus Torvalds committed
204 205 206 207 208
	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
Heiko Carstens's avatar
Heiko Carstens committed
209
	l	%r3,__THREAD_info(%r3)	# load thread_info from task struct
Linus Torvalds's avatar
Linus Torvalds committed
210 211 212 213 214 215 216 217 218 219 220
	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.
 */

Heiko Carstens's avatar
Heiko Carstens committed
221
	.globl	system_call
Linus Torvalds's avatar
Linus Torvalds committed
222 223 224 225
system_call:
	STORE_TIMER __LC_SYNC_ENTER_TIMER
sysc_saveall:
	SAVE_ALL_BASE __LC_SAVE_AREA
226
	SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
227
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
228 229 230 231 232 233 234 235 236 237 238 239 240
	lh	%r7,0x8a	  # get svc number from lowcore
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
sysc_vtime:
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	bz	BASED(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:
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
Heiko Carstens's avatar
Heiko Carstens committed
241 242
	sla	%r7,2			# *4 and test for svc 0
	bnz	BASED(sysc_nr_ok)	# svc number > 0
Linus Torvalds's avatar
Linus Torvalds committed
243 244 245
	# svc 0: system call number in %r1
	cl	%r1,BASED(.Lnr_syscalls)
	bnl	BASED(sysc_nr_ok)
Heiko Carstens's avatar
Heiko Carstens committed
246 247
	lr	%r7,%r1 	  # copy svc number to %r7
	sla	%r7,2		  # *4
Linus Torvalds's avatar
Linus Torvalds committed
248 249 250
sysc_nr_ok:
	mvc	SP_ARGS(4,%r15),SP_R7(%r15)
sysc_do_restart:
251
	l	%r8,BASED(.Lsysc_table)
Linus Torvalds's avatar
Linus Torvalds committed
252
	tm	__TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
253
	l	%r8,0(%r7,%r8)	  # get system call addr.
Heiko Carstens's avatar
Heiko Carstens committed
254 255 256
	bnz	BASED(sysc_tracesys)
	basr	%r14,%r8	  # call sys_xxxx
	st	%r2,SP_R2(%r15)   # store return value (change R2 on stack)
Linus Torvalds's avatar
Linus Torvalds committed
257 258 259 260 261 262 263

sysc_return:
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
	bno	BASED(sysc_leave)
	tm	__TI_flags+3(%r9),_TIF_WORK_SVC
	bnz	BASED(sysc_work)  # there is work to do (signals etc.)
sysc_leave:
Heiko Carstens's avatar
Heiko Carstens committed
264
	RESTORE_ALL __LC_RETURN_PSW,1
Linus Torvalds's avatar
Linus Torvalds committed
265 266 267 268 269 270

#
# recheck if there is more work to do
#
sysc_work_loop:
	tm	__TI_flags+3(%r9),_TIF_WORK_SVC
Heiko Carstens's avatar
Heiko Carstens committed
271
	bz	BASED(sysc_leave)	# there is no work to do
Linus Torvalds's avatar
Linus Torvalds committed
272 273 274 275
#
# One of the work bits is on. Find out which one.
#
sysc_work:
276 277
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
	bo	BASED(sysc_mcck_pending)
Linus Torvalds's avatar
Linus Torvalds committed
278 279
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bo	BASED(sysc_reschedule)
280 281
	tm	__TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
	bnz	BASED(sysc_sigpending)
Linus Torvalds's avatar
Linus Torvalds committed
282 283 284 285 286 287 288 289
	tm	__TI_flags+3(%r9),_TIF_RESTART_SVC
	bo	BASED(sysc_restart)
	tm	__TI_flags+3(%r9),_TIF_SINGLE_STEP
	bo	BASED(sysc_singlestep)
	b	BASED(sysc_leave)

#
# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens's avatar
Heiko Carstens committed
290 291 292 293 294
#
sysc_reschedule:
	l	%r1,BASED(.Lschedule)
	la	%r14,BASED(sysc_work_loop)
	br	%r1			# call scheduler
Linus Torvalds's avatar
Linus Torvalds committed
295

296 297 298 299 300 301 302 303
#
# _TIF_MCCK_PENDING is set, call handler
#
sysc_mcck_pending:
	l	%r1,BASED(.Ls390_handle_mcck)
	la	%r14,BASED(sysc_work_loop)
	br	%r1			# TIF bit will be cleared by handler

Linus Torvalds's avatar
Linus Torvalds committed
304
#
305
# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
Linus Torvalds's avatar
Linus Torvalds committed
306
#
Heiko Carstens's avatar
Heiko Carstens committed
307
sysc_sigpending:
Linus Torvalds's avatar
Linus Torvalds committed
308
	ni	__TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
Heiko Carstens's avatar
Heiko Carstens committed
309 310 311
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
	l	%r1,BASED(.Ldo_signal)
	basr	%r14,%r1		# call do_signal
Linus Torvalds's avatar
Linus Torvalds committed
312 313 314 315
	tm	__TI_flags+3(%r9),_TIF_RESTART_SVC
	bo	BASED(sysc_restart)
	tm	__TI_flags+3(%r9),_TIF_SINGLE_STEP
	bo	BASED(sysc_singlestep)
Heiko Carstens's avatar
Heiko Carstens committed
316
	b	BASED(sysc_work_loop)
Linus Torvalds's avatar
Linus Torvalds committed
317 318 319 320 321 322

#
# _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
Heiko Carstens's avatar
Heiko Carstens committed
323
	l	%r7,SP_R2(%r15) 	# load new svc number
Linus Torvalds's avatar
Linus Torvalds committed
324 325
	sla	%r7,2
	mvc	SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
Heiko Carstens's avatar
Heiko Carstens committed
326 327
	lm	%r2,%r6,SP_R2(%r15)	# load svc arguments
	b	BASED(sysc_do_restart)	# restart svc
Linus Torvalds's avatar
Linus Torvalds committed
328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343

#
# _TIF_SINGLE_STEP is set, call do_single_step
#
sysc_singlestep:
	ni	__TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
	mvi	SP_TRAP+1(%r15),0x28	# set trap indication to pgm check
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	l	%r1,BASED(.Lhandle_per)	# load adr. of per handler
	la	%r14,BASED(sysc_return)	# load adr. of system return
	br	%r1			# branch to do_single_step

#
# call trace before and after sys_call
#
sysc_tracesys:
Heiko Carstens's avatar
Heiko Carstens committed
344 345
	l	%r1,BASED(.Ltrace)
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
346 347 348 349 350 351
	la	%r3,0
	srl	%r7,2
	st	%r7,SP_R2(%r15)
	basr	%r14,%r1
	clc	SP_R2(4,%r15),BASED(.Lnr_syscalls)
	bnl	BASED(sysc_tracenogo)
352
	l	%r8,BASED(.Lsysc_table)
Heiko Carstens's avatar
Heiko Carstens committed
353 354
	l	%r7,SP_R2(%r15) 	# strace might have changed the
	sll	%r7,2			#  system call
355
	l	%r8,0(%r7,%r8)
Linus Torvalds's avatar
Linus Torvalds committed
356 357 358
sysc_tracego:
	lm	%r3,%r6,SP_R3(%r15)
	l	%r2,SP_ORIG_R2(%r15)
Heiko Carstens's avatar
Heiko Carstens committed
359 360
	basr	%r14,%r8		# call sys_xxx
	st	%r2,SP_R2(%r15)		# store return value
Linus Torvalds's avatar
Linus Torvalds committed
361 362
sysc_tracenogo:
	tm	__TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
Heiko Carstens's avatar
Heiko Carstens committed
363
	bz	BASED(sysc_return)
Linus Torvalds's avatar
Linus Torvalds committed
364
	l	%r1,BASED(.Ltrace)
Heiko Carstens's avatar
Heiko Carstens committed
365
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
366 367 368 369 370 371 372
	la	%r3,1
	la	%r14,BASED(sysc_return)
	br	%r1

#
# a new process exits the kernel with ret_from_fork
#
Heiko Carstens's avatar
Heiko Carstens committed
373
	.globl	ret_from_fork
Linus Torvalds's avatar
Linus Torvalds committed
374 375 376 377 378 379
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
Heiko Carstens's avatar
Heiko Carstens committed
380 381
0:	l	%r1,BASED(.Lschedtail)
	basr	%r14,%r1
382
	TRACE_IRQS_ON
Heiko Carstens's avatar
Heiko Carstens committed
383
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
Linus Torvalds's avatar
Linus Torvalds committed
384 385 386
	b	BASED(sysc_return)

#
387 388
# kernel_execve function needs to deal with pt_regs that is not
# at the usual place
Linus Torvalds's avatar
Linus Torvalds committed
389
#
390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417
	.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)
Linus Torvalds's avatar
Linus Torvalds committed
418 419 420 421 422

/*
 * Program check handler routine
 */

Heiko Carstens's avatar
Heiko Carstens committed
423
	.globl	pgm_check_handler
Linus Torvalds's avatar
Linus Torvalds committed
424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
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
440 441
	tm	__LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
	bnz	BASED(pgm_per)		# got per exception -> special case
442
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
443
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
444 445 446 447 448 449 450 451 452
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	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:
#endif
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
Heiko Carstens's avatar
Heiko Carstens committed
453
	l	%r3,__LC_PGM_ILC	# load program interruption code
Linus Torvalds's avatar
Linus Torvalds committed
454 455 456
	la	%r8,0x7f
	nr	%r8,%r3
pgm_do_call:
Heiko Carstens's avatar
Heiko Carstens committed
457 458 459 460 461 462
	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
	la	%r14,BASED(sysc_return)
	br	%r7			# branch to interrupt-handler
Linus Torvalds's avatar
Linus Torvalds committed
463 464 465 466 467

#
# handle per exception
#
pgm_per:
Heiko Carstens's avatar
Heiko Carstens committed
468 469
	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
Linus Torvalds's avatar
Linus Torvalds committed
470
# ok its one of the special cases, now we need to find out which one
Heiko Carstens's avatar
Heiko Carstens committed
471 472
	clc	__LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW
	be	BASED(pgm_svcper)
Linus Torvalds's avatar
Linus Torvalds committed
473
# no interesting special case, ignore PER event
Heiko Carstens's avatar
Heiko Carstens committed
474 475
	lm	%r12,%r15,__LC_SAVE_AREA
	lpsw	0x28
Linus Torvalds's avatar
Linus Torvalds committed
476 477 478 479 480

#
# Normal per exception
#
pgm_per_std:
481
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
482
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
483 484 485 486 487 488 489 490 491 492 493 494 495 496
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	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:
#endif
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	l	%r1,__TI_task(%r9)
	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
Michael Grundy's avatar
Michael Grundy committed
497 498
	tm	SP_PSW+1(%r15),0x01	# kernel per event ?
	bz	BASED(kernel_per)
Heiko Carstens's avatar
Heiko Carstens committed
499
	l	%r3,__LC_PGM_ILC	# load program interruption code
Linus Torvalds's avatar
Linus Torvalds committed
500
	la	%r8,0x7f
Heiko Carstens's avatar
Heiko Carstens committed
501 502
	nr	%r8,%r3 		# clear per-event-bit and ilc
	be	BASED(sysc_return)	# only per or per+check ?
Linus Torvalds's avatar
Linus Torvalds committed
503 504 505 506 507 508
	b	BASED(pgm_do_call)

#
# it was a single stepped SVC that is causing all the trouble
#
pgm_svcper:
509
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
510
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
511 512 513 514 515 516 517 518 519 520 521 522 523 524 525
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	bz	BASED(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
	lh	%r7,0x8a		# get svc number from lowcore
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	l	%r1,__TI_task(%r9)
	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
526
	TRACE_IRQS_ON
Linus Torvalds's avatar
Linus Torvalds committed
527 528 529
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	b	BASED(sysc_do_svc)

Michael Grundy's avatar
Michael Grundy committed
530 531 532 533 534 535 536 537 538 539
#
# per was called from kernel, must be kprobes
#
kernel_per:
	mvi	SP_TRAP+1(%r15),0x28	# set trap indication to pgm check
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	l	%r1,BASED(.Lhandle_per)	# load adr. of per handler
	la	%r14,BASED(sysc_leave)	# load adr. of system return
	br	%r1			# branch to do_single_step

Linus Torvalds's avatar
Linus Torvalds committed
540 541 542 543
/*
 * IO interrupt handler routine
 */

Heiko Carstens's avatar
Heiko Carstens committed
544
	.globl io_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
545 546 547 548
io_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+16
549
	SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
550
	CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
Linus Torvalds's avatar
Linus Torvalds committed
551 552 553 554 555 556 557 558 559
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	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:
#endif
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
560
	TRACE_IRQS_OFF
Heiko Carstens's avatar
Heiko Carstens committed
561 562 563
	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
564
	TRACE_IRQS_ON
Linus Torvalds's avatar
Linus Torvalds committed
565 566

io_return:
Heiko Carstens's avatar
Heiko Carstens committed
567
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
Linus Torvalds's avatar
Linus Torvalds committed
568
#ifdef CONFIG_PREEMPT
Heiko Carstens's avatar
Heiko Carstens committed
569
	bno	BASED(io_preempt)	# no -> check for preemptive scheduling
Linus Torvalds's avatar
Linus Torvalds committed
570
#else
Heiko Carstens's avatar
Heiko Carstens committed
571
	bno	BASED(io_leave) 	# no-> skip resched & signal
Linus Torvalds's avatar
Linus Torvalds committed
572 573
#endif
	tm	__TI_flags+3(%r9),_TIF_WORK_INT
Heiko Carstens's avatar
Heiko Carstens committed
574
	bnz	BASED(io_work)		# there is work to do (signals etc.)
Linus Torvalds's avatar
Linus Torvalds committed
575
io_leave:
Heiko Carstens's avatar
Heiko Carstens committed
576
	RESTORE_ALL __LC_RETURN_PSW,0
577
io_done:
Linus Torvalds's avatar
Linus Torvalds committed
578 579 580 581

#ifdef CONFIG_PREEMPT
io_preempt:
	icm	%r0,15,__TI_precount(%r9)
Heiko Carstens's avatar
Heiko Carstens committed
582
	bnz	BASED(io_leave)
Linus Torvalds's avatar
Linus Torvalds committed
583 584 585
	l	%r1,SP_R15(%r15)
	s	%r1,BASED(.Lc_spsize)
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens's avatar
Heiko Carstens committed
586
	xc	__SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds's avatar
Linus Torvalds committed
587 588 589 590
	lr	%r15,%r1
io_resume_loop:
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bno	BASED(io_leave)
Heiko Carstens's avatar
Heiko Carstens committed
591 592 593
	mvc	__TI_precount(4,%r9),BASED(.Lc_pactive)
	stosm	__SF_EMPTY(%r15),0x03  # reenable interrupts
	l	%r1,BASED(.Lschedule)
Linus Torvalds's avatar
Linus Torvalds committed
594
	basr	%r14,%r1	       # call schedule
Heiko Carstens's avatar
Heiko Carstens committed
595 596
	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
597 598 599 600 601 602 603 604 605 606
	b	BASED(io_resume_loop)
#endif

#
# switch to kernel stack, then check the TIF bits
#
io_work:
	l	%r1,__LC_KERNEL_STACK
	s	%r1,BASED(.Lc_spsize)
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens's avatar
Heiko Carstens committed
607
	xc	__SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds's avatar
Linus Torvalds committed
608 609 610
	lr	%r15,%r1
#
# One of the work bits is on. Find out which one.
611
# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGMASK, _TIF_NEED_RESCHED
Heiko Carstens's avatar
Heiko Carstens committed
612
#		and _TIF_MCCK_PENDING
Linus Torvalds's avatar
Linus Torvalds committed
613 614
#
io_work_loop:
615
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
Heiko Carstens's avatar
Heiko Carstens committed
616
	bo	BASED(io_mcck_pending)
Linus Torvalds's avatar
Linus Torvalds committed
617 618
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bo	BASED(io_reschedule)
619 620
	tm	__TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
	bnz	BASED(io_sigpending)
Linus Torvalds's avatar
Linus Torvalds committed
621 622
	b	BASED(io_leave)

623 624 625 626 627
#
# _TIF_MCCK_PENDING is set, call handler
#
io_mcck_pending:
	l	%r1,BASED(.Ls390_handle_mcck)
628
	la	%r14,BASED(io_work_loop)
Heiko Carstens's avatar
Heiko Carstens committed
629
	br	%r1			# TIF bit will be cleared by handler
630

Linus Torvalds's avatar
Linus Torvalds committed
631 632
#
# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens's avatar
Heiko Carstens committed
633 634 635 636 637 638
#
io_reschedule:
	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
Linus Torvalds's avatar
Linus Torvalds committed
639
	tm	__TI_flags+3(%r9),_TIF_WORK_INT
Heiko Carstens's avatar
Heiko Carstens committed
640
	bz	BASED(io_leave) 	# there is no work to do
Linus Torvalds's avatar
Linus Torvalds committed
641 642 643
	b	BASED(io_work_loop)

#
644
# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
Linus Torvalds's avatar
Linus Torvalds committed
645
#
Heiko Carstens's avatar
Heiko Carstens committed
646 647 648 649 650 651
io_sigpending:
	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
Heiko Carstens's avatar
Heiko Carstens committed
652
	b	BASED(io_work_loop)
Linus Torvalds's avatar
Linus Torvalds committed
653 654 655 656 657

/*
 * External interrupt handler routine
 */

Heiko Carstens's avatar
Heiko Carstens committed
658
	.globl	ext_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
659 660 661 662
ext_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+16
663
	SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
664
	CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
Linus Torvalds's avatar
Linus Torvalds committed
665 666 667 668 669 670 671 672 673
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	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:
#endif
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
674
	TRACE_IRQS_OFF
Heiko Carstens's avatar
Heiko Carstens committed
675 676
	la	%r2,SP_PTREGS(%r15)	# address of register-save area
	lh	%r3,__LC_EXT_INT_CODE	# get interruption code
Linus Torvalds's avatar
Linus Torvalds committed
677 678
	l	%r1,BASED(.Ldo_extint)
	basr	%r14,%r1
679
	TRACE_IRQS_ON
Linus Torvalds's avatar
Linus Torvalds committed
680 681
	b	BASED(io_return)

682 683
__critical_end:

Linus Torvalds's avatar
Linus Torvalds committed
684 685 686 687
/*
 * Machine check handler routines
 */

Heiko Carstens's avatar
Heiko Carstens committed
688
	.globl mcck_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
689
mcck_int_handler:
690 691
	spt	__LC_CPU_TIMER_SAVE_AREA	# revalidate cpu timer
	lm	%r0,%r15,__LC_GPREGS_SAVE_AREA	# revalidate gprs
Linus Torvalds's avatar
Linus Torvalds committed
692
	SAVE_ALL_BASE __LC_SAVE_AREA+32
693
	la	%r12,__LC_MCK_OLD_PSW
Heiko Carstens's avatar
Heiko Carstens committed
694
	tm	__LC_MCCK_CODE,0x80	# system damage?
695
	bo	BASED(mcck_int_main)	# yes -> rest of mcck code invalid
Linus Torvalds's avatar
Linus Torvalds committed
696
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
	mvc	__LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
	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)
	mvc	__LC_ASYNC_ENTER_TIMER(8),0(%r14)
1:
Linus Torvalds's avatar
Linus Torvalds committed
714
#endif
715
	tm	__LC_MCCK_CODE+2,0x09	# mwp + ia of old psw valid?
716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
	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
732
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Heiko Carstens's avatar
Heiko Carstens committed
733
	tm	__LC_MCCK_CODE+2,0x08	# mwp of old psw valid?
734
	bno	BASED(mcck_no_vtime)	# no -> skip cleanup critical
735
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
736 737 738 739 740 741
	bz	BASED(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
742 743
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
Heiko Carstens's avatar
Heiko Carstens committed
744 745 746
	l	%r1,BASED(.Ls390_mcck)
	basr	%r14,%r1		# call machine check handler
	tm	SP_PSW+1(%r15),0x01	# returning to user ?
747
	bno	BASED(mcck_return)
Heiko Carstens's avatar
Heiko Carstens committed
748
	l	%r1,__LC_KERNEL_STACK	# switch to kernel stack
749 750
	s	%r1,BASED(.Lc_spsize)
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens's avatar
Heiko Carstens committed
751
	xc	__SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
752 753 754 755
	lr	%r15,%r1
	stosm	__SF_EMPTY(%r15),0x04	# turn dat on
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
	bno	BASED(mcck_return)
756
	TRACE_IRQS_OFF
757 758
	l	%r1,BASED(.Ls390_handle_mcck)
	basr	%r14,%r1		# call machine check handler
759
	TRACE_IRQS_ON
Linus Torvalds's avatar
Linus Torvalds committed
760
mcck_return:
761 762 763 764 765 766 767 768 769 770 771 772 773 774
	mvc	__LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW
	ni	__LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52
	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
0:
#endif
	lm	%r0,%r15,SP_R0(%r15)	# load gprs 0-15
	lpsw	__LC_RETURN_MCCK_PSW	# back to caller

Heiko Carstens's avatar
Heiko Carstens committed
775
	RESTORE_ALL __LC_RETURN_MCCK_PSW,0
Linus Torvalds's avatar
Linus Torvalds committed
776 777 778 779

/*
 * Restart interruption handler, kick starter for additional CPUs
 */
780 781 782 783
#ifdef CONFIG_SMP
#ifndef CONFIG_HOTPLUG_CPU
	.section .init.text,"ax"
#endif
Heiko Carstens's avatar
Heiko Carstens committed
784
	.globl restart_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
785
restart_int_handler:
Heiko Carstens's avatar
Heiko Carstens committed
786 787 788 789 790 791 792 793
	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
	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
Linus Torvalds's avatar
Linus Torvalds committed
794
restart_addr:
Heiko Carstens's avatar
Heiko Carstens committed
795
	.long	start_secondary
796 797 798
#ifndef CONFIG_HOTPLUG_CPU
	.previous
#endif
Linus Torvalds's avatar
Linus Torvalds committed
799 800 801 802
#else
/*
 * If we do not run with SMP enabled, let the new CPU crash ...
 */
Heiko Carstens's avatar
Heiko Carstens committed
803
	.globl restart_int_handler
Linus Torvalds's avatar
Linus Torvalds committed
804
restart_int_handler:
Heiko Carstens's avatar
Heiko Carstens committed
805
	basr	%r1,0
Linus Torvalds's avatar
Linus Torvalds committed
806
restart_base:
Heiko Carstens's avatar
Heiko Carstens committed
807 808
	lpsw	restart_crash-restart_base(%r1)
	.align	8
Linus Torvalds's avatar
Linus Torvalds committed
809
restart_crash:
Heiko Carstens's avatar
Heiko Carstens committed
810
	.long	0x000a0000,0x00000000
Linus Torvalds's avatar
Linus Torvalds committed
811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831
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
Heiko Carstens's avatar
Heiko Carstens committed
832
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
Linus Torvalds's avatar
Linus Torvalds committed
833
	l	%r1,BASED(1f)		# branch to kernel_stack_overflow
Heiko Carstens's avatar
Heiko Carstens committed
834
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
835
	br	%r1
Heiko Carstens's avatar
Heiko Carstens committed
836
1:	.long	kernel_stack_overflow
Linus Torvalds's avatar
Linus Torvalds committed
837 838 839 840 841 842 843 844 845 846
#endif

cleanup_table_system_call:
	.long	system_call + 0x80000000, sysc_do_svc + 0x80000000
cleanup_table_sysc_return:
	.long	sysc_return + 0x80000000, sysc_leave + 0x80000000
cleanup_table_sysc_leave:
	.long	sysc_leave + 0x80000000, sysc_work_loop + 0x80000000
cleanup_table_sysc_work_loop:
	.long	sysc_work_loop + 0x80000000, sysc_reschedule + 0x80000000
847 848
cleanup_table_io_return:
	.long	io_return + 0x80000000, io_leave + 0x80000000
849 850 851 852
cleanup_table_io_leave:
	.long	io_leave + 0x80000000, io_done + 0x80000000
cleanup_table_io_work_loop:
	.long	io_work_loop + 0x80000000, io_mcck_pending + 0x80000000
Linus Torvalds's avatar
Linus Torvalds committed
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872

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:
	clc	4(4,%r12),BASED(cleanup_table_sysc_return)
	bl	BASED(0f)
	clc	4(4,%r12),BASED(cleanup_table_sysc_return+4)
	bl	BASED(cleanup_sysc_return)
0:
	clc	4(4,%r12),BASED(cleanup_table_sysc_leave)
	bl	BASED(0f)
	clc	4(4,%r12),BASED(cleanup_table_sysc_leave+4)
	bl	BASED(cleanup_sysc_leave)
0:
	clc	4(4,%r12),BASED(cleanup_table_sysc_work_loop)
	bl	BASED(0f)
	clc	4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)
873
	bl	BASED(cleanup_sysc_return)
874 875 876 877 878
0:
	clc	4(4,%r12),BASED(cleanup_table_io_return)
	bl	BASED(0f)
	clc	4(4,%r12),BASED(cleanup_table_io_return+4)
	bl	BASED(cleanup_io_return)
879 880 881 882 883 884 885 886 887 888
0:
	clc	4(4,%r12),BASED(cleanup_table_io_leave)
	bl	BASED(0f)
	clc	4(4,%r12),BASED(cleanup_table_io_leave+4)
	bl	BASED(cleanup_io_leave)
0:
	clc	4(4,%r12),BASED(cleanup_table_io_work_loop)
	bl	BASED(0f)
	clc	4(4,%r12),BASED(cleanup_table_io_work_loop+4)
	bl	BASED(cleanup_io_return)
Linus Torvalds's avatar
Linus Torvalds committed
889 890 891 892 893
0:
	br	%r14

cleanup_system_call:
	mvc	__LC_RETURN_PSW(8),0(%r12)
894 895 896 897 898 899
	c	%r12,BASED(.Lmck_old_psw)
	be	BASED(0f)
	la	%r12,__LC_SAVE_AREA+16
	b	BASED(1f)
0:	la	%r12,__LC_SAVE_AREA+32
1:
Linus Torvalds's avatar
Linus Torvalds committed
900 901 902 903 904 905 906 907 908
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
	bh	BASED(0f)
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
0:	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8)
	bhe	BASED(cleanup_vtime)
#endif
	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
	bh	BASED(0f)
909 910 911
	mvc	__LC_SAVE_AREA(16),0(%r12)
0:	st	%r13,4(%r12)
	st	%r12,__LC_SAVE_AREA+48	# argh
912
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
913
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
914 915
	l	%r12,__LC_SAVE_AREA+48	# argh
	st	%r15,12(%r12)
Linus Torvalds's avatar
Linus Torvalds committed
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937
	lh	%r7,0x8a
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
cleanup_vtime:
	clc	__LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
	bhe	BASED(cleanup_stime)
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
	bz	BASED(cleanup_novtime)
	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
cleanup_novtime:
#endif
	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
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Heiko Carstens's avatar
Heiko Carstens committed
938 939 940 941
	.long	system_call + 0x80000000
	.long	sysc_vtime + 0x80000000
	.long	sysc_stime + 0x80000000
	.long	sysc_update + 0x80000000
Linus Torvalds's avatar
Linus Torvalds committed
942 943 944 945 946 947 948 949 950 951
#endif

cleanup_sysc_return:
	mvc	__LC_RETURN_PSW(4),0(%r12)
	mvc	__LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return)
	la	%r12,__LC_RETURN_PSW
	br	%r14

cleanup_sysc_leave:
	clc	4(4,%r12),BASED(cleanup_sysc_leave_insn)
952
	be	BASED(2f)
Linus Torvalds's avatar
Linus Torvalds committed
953 954 955
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	4(4,%r12),BASED(cleanup_sysc_leave_insn+4)
956
	be	BASED(2f)
Linus Torvalds's avatar
Linus Torvalds committed
957 958
#endif
	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15)
959 960 961 962 963 964
	c	%r12,BASED(.Lmck_old_psw)
	bne	BASED(0f)
	mvc	__LC_SAVE_AREA+32(16),SP_R12(%r15)
	b	BASED(1f)
0:	mvc	__LC_SAVE_AREA+16(16),SP_R12(%r15)
1:	lm	%r0,%r11,SP_R0(%r15)
Linus Torvalds's avatar
Linus Torvalds committed
965
	l	%r15,SP_R15(%r15)
966
2:	la	%r12,__LC_RETURN_PSW
Linus Torvalds's avatar
Linus Torvalds committed
967 968 969 970 971 972 973
	br	%r14
cleanup_sysc_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.long	sysc_leave + 14 + 0x80000000
#endif
	.long	sysc_leave + 10 + 0x80000000

974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003
cleanup_io_return:
	mvc	__LC_RETURN_PSW(4),0(%r12)
	mvc	__LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop)
	la	%r12,__LC_RETURN_PSW
	br	%r14

cleanup_io_leave:
	clc	4(4,%r12),BASED(cleanup_io_leave_insn)
	be	BASED(2f)
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	4(4,%r12),BASED(cleanup_io_leave_insn+4)
	be	BASED(2f)
#endif
	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15)
	c	%r12,BASED(.Lmck_old_psw)
	bne	BASED(0f)
	mvc	__LC_SAVE_AREA+32(16),SP_R12(%r15)
	b	BASED(1f)
0:	mvc	__LC_SAVE_AREA+16(16),SP_R12(%r15)
1:	lm	%r0,%r11,SP_R0(%r15)
	l	%r15,SP_R15(%r15)
2:	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_io_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.long	io_leave + 18 + 0x80000000
#endif
	.long	io_leave + 14 + 0x80000000

Linus Torvalds's avatar
Linus Torvalds committed
1004 1005 1006
/*
 * Integer constants
 */
Heiko Carstens's avatar
Heiko Carstens committed
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
		.align	4
.Lc_spsize:	.long	SP_SIZE
.Lc_overhead:	.long	STACK_FRAME_OVERHEAD
.Lc_pactive:	.long	PREEMPT_ACTIVE
.Lnr_syscalls:	.long	NR_syscalls
.L0x018:	.short	0x018
.L0x020:	.short	0x020
.L0x028:	.short	0x028
.L0x030:	.short	0x030
.L0x038:	.short	0x038
.Lc_1:		.long	1
Linus Torvalds's avatar
Linus Torvalds committed
1018 1019 1020 1021

/*
 * Symbol constants
 */
Heiko Carstens's avatar
Heiko Carstens committed
1022
.Ls390_mcck:	.long	s390_do_machine_check
1023
.Ls390_handle_mcck:
Heiko Carstens's avatar
Heiko Carstens committed
1024 1025 1026 1027 1028 1029
		.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
.Lhandle_per:	.long	do_single_step
1030 1031
.Ldo_execve:	.long	do_execve
.Lexecve_tail:	.long	execve_tail
Heiko Carstens's avatar
Heiko Carstens committed
1032 1033 1034 1035 1036
.Ljump_table:	.long	pgm_check_table
.Lschedule:	.long	schedule
.Ltrace:	.long	syscall_trace
.Lschedtail:	.long	schedule_tail
.Lsysc_table:	.long	sys_call_table
1037
#ifdef CONFIG_TRACE_IRQFLAGS
Heiko Carstens's avatar
Heiko Carstens committed
1038
.Ltrace_irq_on: .long	trace_hardirqs_on
1039
.Ltrace_irq_off:
Heiko Carstens's avatar
Heiko Carstens committed
1040
		.long	trace_hardirqs_off
1041
#endif
Linus Torvalds's avatar
Linus Torvalds committed
1042
.Lcritical_start:
Heiko Carstens's avatar
Heiko Carstens committed
1043
		.long	__critical_start + 0x80000000
Linus Torvalds's avatar
Linus Torvalds committed
1044
.Lcritical_end:
Heiko Carstens's avatar
Heiko Carstens committed
1045
		.long	__critical_end + 0x80000000
Linus Torvalds's avatar
Linus Torvalds committed
1046
.Lcleanup_critical:
Heiko Carstens's avatar
Heiko Carstens committed
1047
		.long	cleanup_critical
Linus Torvalds's avatar
Linus Torvalds committed
1048

Heiko Carstens's avatar
Heiko Carstens committed
1049
		.section .rodata, "a"
Linus Torvalds's avatar
Linus Torvalds committed
1050 1051 1052 1053
#define SYSCALL(esa,esame,emu)	.long esa
sys_call_table:
#include "syscalls.S"
#undef SYSCALL