entry.S 31 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9
/*
 *  arch/s390/kernel/entry.S
 *    S390 low-level entry points.
 *
 *  S390 version
 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *               Hartmut Penner (hp@de.ibm.com),
 *               Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
10
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
Linus Torvalds's avatar
Linus Torvalds committed
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
 */

#include <linux/sys.h>
#include <linux/linkage.h>
#include <linux/config.h>
#include <asm/cache.h>
#include <asm/lowcore.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
#include <asm/offsets.h>
#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.
 */
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

53
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING | \
Linus Torvalds's avatar
Linus Torvalds committed
54
		 _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
55
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
Linus Torvalds's avatar
Linus Torvalds committed
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124

STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE  = 1 << STACK_SHIFT

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

/*
 * 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
 */

	.macro  STORE_TIMER lc_offset
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	stpt	\lc_offset
#endif
	.endm

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.macro  UPDATE_VTIME lc_from,lc_to,lc_sum
	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

	.macro	SAVE_ALL psworg,savearea,sync
	la	%r12,\psworg
	.if	\sync
	tm	\psworg+1,0x01		# test problem state bit
	bz	BASED(2f)		# skip stack setup save
	l	%r15,__LC_KERNEL_STACK	# problem state -> load ksp
	.else
	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
	tm	0(%r12),0x01		# retest problem state after cleanup
	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
	.endif
#ifdef CONFIG_CHECK_STACK
	b	BASED(3f)
2:	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
	bz	BASED(stack_overflow)
3:
#endif
125 126 127 128 129
2:
	.endm

	.macro  CREATE_STACK_FRAME psworg,savearea
	s	%r15,BASED(.Lc_spsize)	# make room for registers & psw
Linus Torvalds's avatar
Linus Torvalds committed
130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
	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

	.macro  RESTORE_ALL sync
	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15) # move user PSW to lowcore
	.if !\sync
	ni	__LC_RETURN_PSW+1,0xfd	# clear wait state bit
	.endif
	lm	%r0,%r15,SP_R0(%r15)	# load gprs 0-15 of user
	STORE_TIMER __LC_EXIT_TIMER
	lpsw	__LC_RETURN_PSW		# back to caller
	.endm

/*
 * Scheduler resume function, called by switch_to
 *  gpr2 = (task_struct *) prev
 *  gpr3 = (task_struct *) next
 * Returns:
 *  gpr2 = prev
 */
        .globl  __switch_to
__switch_to:
        basr    %r1,0
__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
        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
__switch_to_noper:
169 170 171 172 173 174 175
	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:
Linus Torvalds's avatar
Linus Torvalds committed
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
        stm     %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
	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
	l	%r3,__THREAD_info(%r3)  # load thread_info from task struct
	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.
 */

	.globl  system_call
system_call:
	STORE_TIMER __LC_SYNC_ENTER_TIMER
sysc_saveall:
	SAVE_ALL_BASE __LC_SAVE_AREA
        SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
200
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249
	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
	sla	%r7,2             # *4 and test for svc 0
	bnz	BASED(sysc_nr_ok) # svc number > 0
	# svc 0: system call number in %r1
	cl	%r1,BASED(.Lnr_syscalls)
	bnl	BASED(sysc_nr_ok)
	lr	%r7,%r1           # copy svc number to %r7
	sla	%r7,2             # *4
sysc_nr_ok:
	mvc	SP_ARGS(4,%r15),SP_R7(%r15)
sysc_do_restart:
	tm	__TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
        l       %r8,sys_call_table-system_call(%r7,%r13) # get system call addr.
        bnz     BASED(sysc_tracesys)
        basr    %r14,%r8          # call sys_xxxx
        st      %r2,SP_R2(%r15)   # store return value (change R2 on stack)
                                  # ATTENTION: check sys_execve_glue before
                                  # changing anything here !!

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:
        RESTORE_ALL 1

#
# recheck if there is more work to do
#
sysc_work_loop:
	tm	__TI_flags+3(%r9),_TIF_WORK_SVC
	bz	BASED(sysc_leave)      # there is no work to do
#
# One of the work bits is on. Find out which one.
#
sysc_work:
250 251
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
	bo	BASED(sysc_mcck_pending)
Linus Torvalds's avatar
Linus Torvalds committed
252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bo	BASED(sysc_reschedule)
	tm	__TI_flags+3(%r9),_TIF_SIGPENDING
	bo	BASED(sysc_sigpending)
	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
#	
sysc_reschedule:        
        l       %r1,BASED(.Lschedule)
	la      %r14,BASED(sysc_work_loop)
	br      %r1		       # call scheduler

270 271 272 273 274 275 276 277
#
# _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
278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
#
# _TIF_SIGPENDING is set, call do_signal
#
sysc_sigpending:     
	ni	__TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        sr      %r3,%r3                # clear *oldset
        l       %r1,BASED(.Ldo_signal)
	basr	%r14,%r1               # call do_signal
	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)      # out of here, do NOT recheck

#
# _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
	l	%r7,SP_R2(%r15)        # load new svc number
	sla	%r7,2
	mvc	SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
	lm	%r2,%r6,SP_R2(%r15)    # load svc arguments
	b	BASED(sysc_do_restart) # restart svc

#
# _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

__critical_end:

#
# call trace before and after sys_call
#
sysc_tracesys:
        l       %r1,BASED(.Ltrace)
	la	%r2,SP_PTREGS(%r15)    # load pt_regs
	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)
	l	%r7,SP_R2(%r15)        # strace might have changed the 
	sll	%r7,2                  #  system call
	l	%r8,sys_call_table-system_call(%r7,%r13)
sysc_tracego:
	lm	%r3,%r6,SP_R3(%r15)
	l	%r2,SP_ORIG_R2(%r15)
	basr	%r14,%r8          # call sys_xxx
	st	%r2,SP_R2(%r15)   # store return value
sysc_tracenogo:
	tm	__TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
        bz      BASED(sysc_return)
	l	%r1,BASED(.Ltrace)
	la	%r2,SP_PTREGS(%r15)    # load pt_regs
	la	%r3,1
	la	%r14,BASED(sysc_return)
	br	%r1

#
# a new process exits the kernel with ret_from_fork
#
        .globl  ret_from_fork
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
0:	l       %r1,BASED(.Lschedtail)
	basr    %r14,%r1
        stosm   __SF_EMPTY(%r15),0x03     # reenable interrupts
	b	BASED(sysc_return)

#
# clone, fork, vfork, exec and sigreturn need glue,
# because they all expect pt_regs as parameter,
# but are called with different parameter.
# return-address is set up above
#
sys_clone_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        l       %r1,BASED(.Lclone)
        br      %r1                   # branch to sys_clone

sys_fork_glue:  
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        l       %r1,BASED(.Lfork)
        br      %r1                   # branch to sys_fork

sys_vfork_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        l       %r1,BASED(.Lvfork)
        br      %r1                   # branch to sys_vfork

sys_execve_glue:        
        la      %r2,SP_PTREGS(%r15)   # load pt_regs
        l       %r1,BASED(.Lexecve)
	lr      %r12,%r14             # save return address
        basr    %r14,%r1              # call sys_execve
        ltr     %r2,%r2               # check if execve failed
        bnz     0(%r12)               # it did fail -> store result in gpr2
        b       4(%r12)               # SKIP ST 2,SP_R2(15) after BASR 14,8
                                      # in system_call/sysc_tracesys

sys_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        l       %r1,BASED(.Lsigreturn)
        br      %r1                   # branch to sys_sigreturn

sys_rt_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        l       %r1,BASED(.Lrt_sigreturn)
        br      %r1                   # branch to sys_sigreturn

#
# sigsuspend and rt_sigsuspend need pt_regs as an additional
# parameter and they have to skip the store of %r2 into the
# user register %r2 because the return value was set in 
# sigsuspend and rt_sigsuspend already and must not be overwritten!
#

sys_sigsuspend_glue:    
        lr      %r5,%r4               # move mask back
        lr      %r4,%r3               # move history1 parameter
        lr      %r3,%r2               # move history0 parameter
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as first parameter
        l       %r1,BASED(.Lsigsuspend)
	la      %r14,4(%r14)          # skip store of return value
        br      %r1                   # branch to sys_sigsuspend

sys_rt_sigsuspend_glue: 
        lr      %r4,%r3               # move sigsetsize parameter
        lr      %r3,%r2               # move unewset parameter
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as first parameter
        l       %r1,BASED(.Lrt_sigsuspend)
	la      %r14,4(%r14)          # skip store of return value
        br      %r1                   # branch to sys_rt_sigsuspend

sys_sigaltstack_glue:
        la      %r4,SP_PTREGS(%r15)   # load pt_regs as parameter
        l       %r1,BASED(.Lsigaltstack)
        br      %r1                   # branch to sys_sigreturn


/*
 * Program check handler routine
 */

        .globl  pgm_check_handler
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
        tm      __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
        bnz     BASED(pgm_per)           # got per exception -> special case
	SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
456
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494
#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
        l       %r3,__LC_PGM_ILC         # load program interruption code
	la	%r8,0x7f
	nr	%r8,%r3
pgm_do_call:
        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

#
# handle per exception
#
pgm_per:
        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
# ok its one of the special cases, now we need to find out which one
        clc     __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW
        be      BASED(pgm_svcper)
# no interesting special case, ignore PER event
        lm      %r12,%r15,__LC_SAVE_AREA
	lpsw    0x28

#
# Normal per exception
#
pgm_per_std:
	SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
495
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520
#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
	l	%r3,__LC_PGM_ILC	 # load program interruption code
	la	%r8,0x7f
	nr	%r8,%r3                  # clear per-event-bit and ilc
	be	BASED(sysc_return)       # only per or per+check ?
	b	BASED(pgm_do_call)

#
# it was a single stepped SVC that is causing all the trouble
#
pgm_svcper:
	SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
521
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
#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
	stosm	__SF_EMPTY(%r15),0x03	# reenable interrupts
	b	BASED(sysc_do_svc)

/*
 * IO interrupt handler routine
 */

        .globl io_int_handler
io_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+16
        SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0
550
	CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
Linus Torvalds's avatar
Linus Torvalds committed
551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607
#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
        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

io_return:
        tm      SP_PSW+1(%r15),0x01    # returning to user ?
#ifdef CONFIG_PREEMPT
	bno     BASED(io_preempt)      # no -> check for preemptive scheduling
#else
        bno     BASED(io_leave)        # no-> skip resched & signal
#endif
	tm	__TI_flags+3(%r9),_TIF_WORK_INT
	bnz	BASED(io_work)         # there is work to do (signals etc.)
io_leave:
        RESTORE_ALL 0

#ifdef CONFIG_PREEMPT
io_preempt:
	icm	%r0,15,__TI_precount(%r9)
	bnz     BASED(io_leave)
	l	%r1,SP_R15(%r15)
	s	%r1,BASED(.Lc_spsize)
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
        xc      __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lr	%r15,%r1
io_resume_loop:
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bno	BASED(io_leave)
	mvc     __TI_precount(4,%r9),BASED(.Lc_pactive)
        stosm   __SF_EMPTY(%r15),0x03  # reenable interrupts
        l       %r1,BASED(.Lschedule)
	basr	%r14,%r1	       # call schedule
        stnsm   __SF_EMPTY(%r15),0xfc  # disable I/O and ext. interrupts
	xc      __TI_precount(4,%r9),__TI_precount(%r9)
	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)
        xc      __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lr	%r15,%r1
#
# One of the work bits is on. Find out which one.
608
# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED and _TIF_MCCK_PENDING
Linus Torvalds's avatar
Linus Torvalds committed
609 610
#
io_work_loop:
611 612
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
	bo      BASED(io_mcck_pending)
Linus Torvalds's avatar
Linus Torvalds committed
613 614 615 616 617 618
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bo	BASED(io_reschedule)
	tm	__TI_flags+3(%r9),_TIF_SIGPENDING
	bo	BASED(io_sigpending)
	b	BASED(io_leave)

619 620 621 622 623 624 625 626
#
# _TIF_MCCK_PENDING is set, call handler
#
io_mcck_pending:
	l	%r1,BASED(.Ls390_handle_mcck)
	l	%r14,BASED(io_work_loop)
	br	%r1		       # TIF bit will be cleared by handler

Linus Torvalds's avatar
Linus Torvalds committed
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660
#
# _TIF_NEED_RESCHED is set, call schedule
#	
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
	tm	__TI_flags+3(%r9),_TIF_WORK_INT
	bz	BASED(io_leave)        # there is no work to do
	b	BASED(io_work_loop)

#
# _TIF_SIGPENDING is set, call do_signal
#
io_sigpending:     
        stosm   __SF_EMPTY(%r15),0x03  # reenable interrupts
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        sr      %r3,%r3                # clear *oldset
        l       %r1,BASED(.Ldo_signal)
	basr    %r14,%r1	       # call do_signal
        stnsm   __SF_EMPTY(%r15),0xfc  # disable I/O and ext. interrupts
	b	BASED(io_leave)        # out of here, do NOT recheck

/*
 * External interrupt handler routine
 */

        .globl  ext_int_handler
ext_int_handler:
	STORE_TIMER __LC_ASYNC_ENTER_TIMER
	stck	__LC_INT_CLOCK
	SAVE_ALL_BASE __LC_SAVE_AREA+16
        SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0
661
	CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
Linus Torvalds's avatar
Linus Torvalds committed
662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
#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
	la	%r2,SP_PTREGS(%r15)    # address of register-save area
	lh	%r3,__LC_EXT_INT_CODE  # get interruption code
	l	%r1,BASED(.Ldo_extint)
	basr	%r14,%r1
	b	BASED(io_return)

/*
 * Machine check handler routines
 */

        .globl mcck_int_handler
mcck_int_handler:
683 684
	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
685
	SAVE_ALL_BASE __LC_SAVE_AREA+32
686 687 688 689 690 691
	la	%r12,__LC_MCK_OLD_PSW
	tm	__LC_MCCK_CODE,0x80     # system damage?
	bo	BASED(mcck_int_main)	# yes -> rest of mcck code invalid
	tm	__LC_MCCK_CODE+5,0x02   # stored cpu timer value valid?
	bo	BASED(0f)
	spt	__LC_LAST_UPDATE_TIMER	# revalidate cpu timer
Linus Torvalds's avatar
Linus Torvalds committed
692
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
693 694 695
	mvc	__LC_ASYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
	mvc	__LC_SYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
	mvc	__LC_EXIT_TIMER(8),__LC_LAST_UPDATE_TIMER
696 697 698
0:	tm	__LC_MCCK_CODE+2,0x08   # mwp of old psw valid?
	bno	BASED(mcck_no_vtime)	# no -> skip cleanup critical
	tm	__LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?
Linus Torvalds's avatar
Linus Torvalds committed
699 700 701 702 703 704
	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
705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724
0:
	tm	__LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?
	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
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
Linus Torvalds's avatar
Linus Torvalds committed
725
	l       %r1,BASED(.Ls390_mcck)
726 727 728 729 730 731 732 733 734 735 736 737 738
	basr    %r14,%r1		# call machine check handler
	tm      SP_PSW+1(%r15),0x01	# returning to user ?
	bno	BASED(mcck_return)
	l	%r1,__LC_KERNEL_STACK   # switch to kernel stack
	s	%r1,BASED(.Lc_spsize)
	mvc	SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
	xc      __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
	lr	%r15,%r1
	stosm	__SF_EMPTY(%r15),0x04	# turn dat on
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
	bno	BASED(mcck_return)
	l	%r1,BASED(.Ls390_handle_mcck)
	basr	%r14,%r1		# call machine check handler
Linus Torvalds's avatar
Linus Torvalds committed
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
mcck_return:
        RESTORE_ALL 0

#ifdef CONFIG_SMP
/*
 * Restart interruption handler, kick starter for additional CPUs
 */
        .globl restart_int_handler
restart_int_handler:
        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
restart_addr:
        .long   start_secondary
#else
/*
 * If we do not run with SMP enabled, let the new CPU crash ...
 */
        .globl restart_int_handler
restart_int_handler:
        basr    %r1,0
restart_base:
        lpsw    restart_crash-restart_base(%r1)
        .align 8
restart_crash:
        .long  0x000a0000,0x00000000
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
        xc      __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
	l	%r1,BASED(1f)		# branch to kernel_stack_overflow
        la      %r2,SP_PTREGS(%r15)	# load pt_regs
	br	%r1
1:	.long  kernel_stack_overflow
#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

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)
826
	bl	BASED(cleanup_sysc_return)
Linus Torvalds's avatar
Linus Torvalds committed
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843
0:
	br	%r14

cleanup_system_call:
	mvc	__LC_RETURN_PSW(8),0(%r12)
#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)
	mvc	__LC_SAVE_AREA(16),__LC_SAVE_AREA+16
0:	st	%r13,__LC_SAVE_AREA+20
	SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
844
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds's avatar
Linus Torvalds committed
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
	st	%r15,__LC_SAVE_AREA+28
	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
	.long   system_call + 0x80000000
	.long   sysc_vtime + 0x80000000
	.long   sysc_stime + 0x80000000
	.long   sysc_update + 0x80000000
#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)
	be	BASED(0f)
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	4(4,%r12),BASED(cleanup_sysc_leave_insn+4)
	be	BASED(0f)
#endif
	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15)
	mvc	__LC_SAVE_AREA+16(16),SP_R12(%r15)
	lm	%r0,%r11,SP_R0(%r15)
	l	%r15,SP_R15(%r15)
0:	la	%r12,__LC_RETURN_PSW
	br	%r14
cleanup_sysc_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.long	sysc_leave + 14 + 0x80000000
#endif
	.long	sysc_leave + 10 + 0x80000000

/*
 * Integer constants
 */
               .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

/*
 * Symbol constants
 */
.Ls390_mcck:   .long  s390_do_machine_check
919 920
.Ls390_handle_mcck:
	       .long  s390_handle_mcck
Linus Torvalds's avatar
Linus Torvalds committed
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
.Ldo_IRQ:      .long  do_IRQ
.Ldo_extint:   .long  do_extint
.Ldo_signal:   .long  do_signal
.Lhandle_per:  .long  do_single_step
.Ljump_table:  .long  pgm_check_table
.Lschedule:    .long  schedule
.Lclone:       .long  sys_clone
.Lexecve:      .long  sys_execve
.Lfork:        .long  sys_fork
.Lrt_sigreturn:.long  sys_rt_sigreturn
.Lrt_sigsuspend:
               .long  sys_rt_sigsuspend
.Lsigreturn:   .long  sys_sigreturn
.Lsigsuspend:  .long  sys_sigsuspend
.Lsigaltstack: .long  sys_sigaltstack
.Ltrace:       .long  syscall_trace
.Lvfork:       .long  sys_vfork
.Lschedtail:   .long  schedule_tail

.Lcritical_start:
               .long  __critical_start + 0x80000000
.Lcritical_end:
               .long  __critical_end + 0x80000000
.Lcleanup_critical:
               .long  cleanup_critical

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