entry.S 32.5 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 7 8
 *    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),
9
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
L
Linus Torvalds 已提交
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>
L
Linus Torvalds 已提交
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
#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

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)
L
Linus Torvalds 已提交
55 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

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

95
	.macro	SAVE_ALL_SYNC psworg,savearea
L
Linus Torvalds 已提交
96 97 98 99
	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
100 101 102 103 104 105 106 107 108 109 110
#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
111 112 113 114 115 116 117 118
	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
119
	tm	1(%r12),0x01		# retest problem state after cleanup
L
Linus Torvalds 已提交
120 121 122 123 124 125 126 127 128 129 130 131
	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
132 133 134 135 136
2:
	.endm

	.macro  CREATE_STACK_FRAME psworg,savearea
	s	%r15,BASED(.Lc_spsize)	# make room for registers & psw
L
Linus Torvalds 已提交
137 138 139 140 141 142 143 144 145 146 147
	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

148 149
	.macro  RESTORE_ALL psworg,sync
	mvc	\psworg(8),SP_PSW(%r15) # move user PSW to lowcore
L
Linus Torvalds 已提交
150
	.if !\sync
151
	ni	\psworg+1,0xfd		# clear wait state bit
L
Linus Torvalds 已提交
152 153 154
	.endif
	lm	%r0,%r15,SP_R0(%r15)	# load gprs 0-15 of user
	STORE_TIMER __LC_EXIT_TIMER
155
	lpsw	\psworg			# back to caller
L
Linus Torvalds 已提交
156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
	.endm

/*
 * Scheduler resume function, called by switch_to
 *  gpr2 = (task_struct *) prev
 *  gpr3 = (task_struct *) next
 * Returns:
 *  gpr2 = prev
 */
        .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:
176 177 178 179 180 181 182
	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:
L
Linus Torvalds 已提交
183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205
        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
206
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
207
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
L
Linus Torvalds 已提交
208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230
	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:
231
	l	%r8,BASED(.Lsysc_table)
L
Linus Torvalds 已提交
232
	tm	__TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
233
	l	%r8,0(%r7,%r8)	  # get system call addr.
L
Linus Torvalds 已提交
234 235 236 237 238 239 240 241 242 243 244 245
        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:
246
        RESTORE_ALL __LC_RETURN_PSW,1
L
Linus Torvalds 已提交
247 248 249 250 251 252 253 254 255 256 257

#
# 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:
258 259
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
	bo	BASED(sysc_mcck_pending)
L
Linus Torvalds 已提交
260 261
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bo	BASED(sysc_reschedule)
262 263
	tm	__TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
	bnz	BASED(sysc_sigpending)
L
Linus Torvalds 已提交
264 265 266 267 268 269 270 271 272 273 274 275 276 277
	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

278 279 280 281 282 283 284 285
#
# _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

L
Linus Torvalds 已提交
286
#
287
# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
L
Linus Torvalds 已提交
288 289 290 291 292 293 294 295 296 297
#
sysc_sigpending:     
	ni	__TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        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)
H
Heiko Carstens 已提交
298
	b	BASED(sysc_work_loop)
L
Linus Torvalds 已提交
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

#
# _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

#
# 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)
334
	l	%r8,BASED(.Lsysc_table)
L
Linus Torvalds 已提交
335 336
	l	%r7,SP_R2(%r15)        # strace might have changed the 
	sll	%r7,2                  #  system call
337
	l	%r8,0(%r7,%r8)
L
Linus Torvalds 已提交
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
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

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
437
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
438
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
L
Linus Torvalds 已提交
439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475
#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:
476
	SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
477
	CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
L
Linus Torvalds 已提交
478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501
#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:
502
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
503
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
L
Linus Torvalds 已提交
504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530
#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
531
	SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
532
	CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
L
Linus Torvalds 已提交
533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555
#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:
556 557
        RESTORE_ALL __LC_RETURN_PSW,0
io_done:
L
Linus Torvalds 已提交
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

#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.
591 592
# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGMASK, _TIF_NEED_RESCHED
#	        and _TIF_MCCK_PENDING
L
Linus Torvalds 已提交
593 594
#
io_work_loop:
595 596
	tm	__TI_flags+3(%r9),_TIF_MCCK_PENDING
	bo      BASED(io_mcck_pending)
L
Linus Torvalds 已提交
597 598
	tm	__TI_flags+3(%r9),_TIF_NEED_RESCHED
	bo	BASED(io_reschedule)
599 600
	tm	__TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
	bnz	BASED(io_sigpending)
L
Linus Torvalds 已提交
601 602
	b	BASED(io_leave)

603 604 605 606 607
#
# _TIF_MCCK_PENDING is set, call handler
#
io_mcck_pending:
	l	%r1,BASED(.Ls390_handle_mcck)
608
	la	%r14,BASED(io_work_loop)
609 610
	br	%r1		       # TIF bit will be cleared by handler

L
Linus Torvalds 已提交
611 612 613 614 615 616 617 618 619 620 621 622 623
#
# _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)

#
624
# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
L
Linus Torvalds 已提交
625 626 627 628 629 630 631
#
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
H
Heiko Carstens 已提交
632
	b	BASED(io_work_loop)
L
Linus Torvalds 已提交
633 634 635 636 637 638 639 640 641 642

/*
 * 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
643
	SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
644
	CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
L
Linus Torvalds 已提交
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659
#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)

660 661
__critical_end:

L
Linus Torvalds 已提交
662 663 664 665 666 667
/*
 * Machine check handler routines
 */

        .globl mcck_int_handler
mcck_int_handler:
668 669
	spt	__LC_CPU_TIMER_SAVE_AREA	# revalidate cpu timer
	lm	%r0,%r15,__LC_GPREGS_SAVE_AREA	# revalidate gprs
L
Linus Torvalds 已提交
670
	SAVE_ALL_BASE __LC_SAVE_AREA+32
671 672 673
	la	%r12,__LC_MCK_OLD_PSW
	tm	__LC_MCCK_CODE,0x80     # system damage?
	bo	BASED(mcck_int_main)	# yes -> rest of mcck code invalid
L
Linus Torvalds 已提交
674
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691
	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:
L
Linus Torvalds 已提交
692
#endif
693
	tm	__LC_MCCK_CODE+2,0x09	# mwp + ia of old psw valid?
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709
	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
710 711 712
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	tm	__LC_MCCK_CODE+2,0x08   # mwp of old psw valid?
	bno	BASED(mcck_no_vtime)	# no -> skip cleanup critical
713
	tm	SP_PSW+1(%r15),0x01	# interrupting from user ?
714 715 716 717 718 719
	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
720 721
	l	%r9,__LC_THREAD_INFO	# load pointer to thread_info struct
	la	%r2,SP_PTREGS(%r15)	# load pt_regs
L
Linus Torvalds 已提交
722
	l       %r1,BASED(.Ls390_mcck)
723 724 725 726 727 728 729 730 731 732 733 734 735
	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
L
Linus Torvalds 已提交
736
mcck_return:
737 738 739 740 741 742 743 744 745 746 747 748 749 750
	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

751
        RESTORE_ALL __LC_RETURN_MCCK_PSW,0
L
Linus Torvalds 已提交
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

#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
817 818
cleanup_table_io_return:
	.long	io_return + 0x80000000, io_leave + 0x80000000
819 820 821 822
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
L
Linus Torvalds 已提交
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842

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)
843
	bl	BASED(cleanup_sysc_return)
844 845 846 847 848
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)
849 850 851 852 853 854 855 856 857 858
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)
L
Linus Torvalds 已提交
859 860 861 862 863
0:
	br	%r14

cleanup_system_call:
	mvc	__LC_RETURN_PSW(8),0(%r12)
864 865 866 867 868 869
	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:
L
Linus Torvalds 已提交
870 871 872 873 874 875 876 877 878
#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)
879 880 881
	mvc	__LC_SAVE_AREA(16),0(%r12)
0:	st	%r13,4(%r12)
	st	%r12,__LC_SAVE_AREA+48	# argh
882
	SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
883
	CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
884 885
	l	%r12,__LC_SAVE_AREA+48	# argh
	st	%r15,12(%r12)
L
Linus Torvalds 已提交
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
	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)
922
	be	BASED(2f)
L
Linus Torvalds 已提交
923 924 925
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	mvc	__LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
	clc	4(4,%r12),BASED(cleanup_sysc_leave_insn+4)
926
	be	BASED(2f)
L
Linus Torvalds 已提交
927 928
#endif
	mvc	__LC_RETURN_PSW(8),SP_PSW(%r15)
929 930 931 932 933 934
	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
Linus Torvalds 已提交
935
	l	%r15,SP_R15(%r15)
936
2:	la	%r12,__LC_RETURN_PSW
L
Linus Torvalds 已提交
937 938 939 940 941 942 943
	br	%r14
cleanup_sysc_leave_insn:
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	.long	sysc_leave + 14 + 0x80000000
#endif
	.long	sysc_leave + 10 + 0x80000000

944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
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

L
Linus Torvalds 已提交
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992
/*
 * 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
993 994
.Ls390_handle_mcck:
	       .long  s390_handle_mcck
995
.Lmck_old_psw: .long  __LC_MCK_OLD_PSW
L
Linus Torvalds 已提交
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013
.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
1014
.Lsysc_table:  .long  sys_call_table
L
Linus Torvalds 已提交
1015 1016 1017 1018 1019 1020 1021 1022

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

1023
	       .section .rodata, "a"
L
Linus Torvalds 已提交
1024 1025 1026 1027
#define SYSCALL(esa,esame,emu)	.long esa
sys_call_table:
#include "syscalls.S"
#undef SYSCALL