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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -08002 * arch/s390/kernel/entry64.S
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * S390 low-level entry points.
4 *
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -08005 * Copyright (C) IBM Corp. 1999,2006
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
Heiko Carstens25d83cb2006-09-28 16:56:37 +02007 * Hartmut Penner (hp@de.ibm.com),
8 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
Heiko Carstens77fa2242005-06-25 14:55:30 -07009 * Heiko Carstens <heiko.carstens@de.ibm.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
12#include <linux/sys.h>
13#include <linux/linkage.h>
Heiko Carstens2bc89b52008-02-05 16:50:40 +010014#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <asm/cache.h>
16#include <asm/lowcore.h>
17#include <asm/errno.h>
18#include <asm/ptrace.h>
19#include <asm/thread_info.h>
Sam Ravnborg0013a852005-09-09 20:57:26 +020020#include <asm/asm-offsets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <asm/unistd.h>
22#include <asm/page.h>
23
24/*
25 * Stack layout for the system_call stack entry.
26 * The first few entries are identical to the user_regs_struct.
27 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +020028SP_PTREGS = STACK_FRAME_OVERHEAD
29SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS
30SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
31SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS
32SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
33SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
34SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
35SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
36SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
37SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
38SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
39SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 64
40SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 72
41SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 80
42SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 88
43SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 96
44SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 104
45SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 112
46SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 120
47SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
48SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC
49SP_TRAP = STACK_FRAME_OVERHEAD + __PT_TRAP
50SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
53STACK_SIZE = 1 << STACK_SHIFT
54
Roland McGrath02a029b2008-04-30 00:53:08 -070055_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -080056 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
Roland McGrath02a029b2008-04-30 00:53:08 -070057_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -080058 _TIF_MCCK_PENDING)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60#define BASED(name) name-system_call(%r13)
61
Heiko Carstens1f194a42006-07-03 00:24:46 -070062#ifdef CONFIG_TRACE_IRQFLAGS
63 .macro TRACE_IRQS_ON
64 brasl %r14,trace_hardirqs_on
65 .endm
66
67 .macro TRACE_IRQS_OFF
68 brasl %r14,trace_hardirqs_off
69 .endm
Heiko Carstens523b44c2007-10-11 22:11:12 +020070
Heiko Carstens411788e2007-11-20 11:13:32 +010071 .macro TRACE_IRQS_CHECK
72 tm SP_PSW(%r15),0x03 # irqs enabled?
73 jz 0f
74 brasl %r14,trace_hardirqs_on
75 j 1f
760: brasl %r14,trace_hardirqs_off
771:
Heiko Carstens523b44c2007-10-11 22:11:12 +020078 .endm
Heiko Carstens1f194a42006-07-03 00:24:46 -070079#else
80#define TRACE_IRQS_ON
81#define TRACE_IRQS_OFF
Heiko Carstens411788e2007-11-20 11:13:32 +010082#define TRACE_IRQS_CHECK
83#endif
84
85#ifdef CONFIG_LOCKDEP
86 .macro LOCKDEP_SYS_EXIT
87 tm SP_PSW+1(%r15),0x01 # returning to user ?
88 jz 0f
89 brasl %r14,lockdep_sys_exit
900:
91 .endm
92#else
Heiko Carstens523b44c2007-10-11 22:11:12 +020093#define LOCKDEP_SYS_EXIT
Heiko Carstens1f194a42006-07-03 00:24:46 -070094#endif
95
Heiko Carstens25d83cb2006-09-28 16:56:37 +020096 .macro STORE_TIMER lc_offset
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#ifdef CONFIG_VIRT_CPU_ACCOUNTING
98 stpt \lc_offset
99#endif
100 .endm
101
102#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200103 .macro UPDATE_VTIME lc_from,lc_to,lc_sum
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 lg %r10,\lc_from
105 slg %r10,\lc_to
106 alg %r10,\lc_sum
107 stg %r10,\lc_sum
108 .endm
109#endif
110
111/*
112 * Register usage in interrupt handlers:
113 * R9 - pointer to current task structure
114 * R13 - pointer to literal pool
115 * R14 - return register for function calls
116 * R15 - kernel stack pointer
117 */
118
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200119 .macro SAVE_ALL_BASE savearea
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 stmg %r12,%r15,\savearea
121 larl %r13,system_call
122 .endm
123
Martin Schwidefsky987ad702007-07-10 11:24:18 +0200124 .macro SAVE_ALL_SVC psworg,savearea
125 la %r12,\psworg
126 lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
127 .endm
128
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200129 .macro SAVE_ALL_SYNC psworg,savearea
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 la %r12,\psworg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 tm \psworg+1,0x01 # test problem state bit
132 jz 2f # skip stack setup save
133 lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200134#ifdef CONFIG_CHECK_STACK
135 j 3f
1362: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
137 jz stack_overflow
1383:
139#endif
1402:
141 .endm
142
143 .macro SAVE_ALL_ASYNC psworg,savearea
144 la %r12,\psworg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 tm \psworg+1,0x01 # test problem state bit
146 jnz 1f # from user -> load kernel stack
147 clc \psworg+8(8),BASED(.Lcritical_end)
148 jhe 0f
149 clc \psworg+8(8),BASED(.Lcritical_start)
150 jl 0f
151 brasl %r14,cleanup_critical
Peter Oberparleiter6add9f72005-09-16 19:27:42 -0700152 tm 1(%r12),0x01 # retest problem state after cleanup
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 jnz 1f
1540: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ?
155 slgr %r14,%r15
156 srag %r14,%r14,STACK_SHIFT
157 jz 2f
1581: lg %r15,__LC_ASYNC_STACK # load async stack
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159#ifdef CONFIG_CHECK_STACK
160 j 3f
1612: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
162 jz stack_overflow
1633:
164#endif
Heiko Carstens77fa2242005-06-25 14:55:30 -07001652:
166 .endm
167
168 .macro CREATE_STACK_FRAME psworg,savearea
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200169 aghi %r15,-SP_SIZE # make room for registers & psw
170 mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 la %r12,\psworg
172 stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
173 icm %r12,12,__LC_SVC_ILC
174 stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
175 st %r12,SP_ILC(%r15)
176 mvc SP_R12(32,%r15),\savearea # move %r12-%r15 to stack
177 la %r12,0
178 stg %r12,__SF_BACKCHAIN(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200179 .endm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700181 .macro RESTORE_ALL psworg,sync
182 mvc \psworg(16),SP_PSW(%r15) # move user PSW to lowcore
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 .if !\sync
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700184 ni \psworg+1,0xfd # clear wait state bit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 .endif
186 lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
187 STORE_TIMER __LC_EXIT_TIMER
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700188 lpswe \psworg # back to caller
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 .endm
190
191/*
192 * Scheduler resume function, called by switch_to
193 * gpr2 = (task_struct *) prev
194 * gpr3 = (task_struct *) next
195 * Returns:
196 * gpr2 = prev
197 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200198 .globl __switch_to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199__switch_to:
200 tm __THREAD_per+4(%r3),0xe8 # is the new process using per ?
201 jz __switch_to_noper # if not we're fine
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200202 stctg %c9,%c11,__SF_EMPTY(%r15)# We are using per stuff
203 clc __THREAD_per(24,%r3),__SF_EMPTY(%r15)
204 je __switch_to_noper # we got away without bashing TLB's
205 lctlg %c9,%c11,__THREAD_per(%r3) # Nope we didn't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206__switch_to_noper:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200207 lg %r4,__THREAD_info(%r2) # get thread_info of prev
Heiko Carstens77fa2242005-06-25 14:55:30 -0700208 tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
209 jz __switch_to_no_mcck
210 ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
211 lg %r4,__THREAD_info(%r3) # get thread_info of next
212 oi __TI_flags+7(%r4),_TIF_MCCK_PENDING # set it in next
213__switch_to_no_mcck:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200214 stmg %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 stg %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
216 lg %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200217 lmg %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 stg %r3,__LC_CURRENT # __LC_CURRENT = current task struct
219 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200220 lg %r3,__THREAD_info(%r3) # load thread_info from task struct
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 stg %r3,__LC_THREAD_INFO
222 aghi %r3,STACK_SIZE
223 stg %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
224 br %r14
225
226__critical_start:
227/*
228 * SVC interrupt handler routine. System calls are synchronous events and
229 * are executed with interrupts enabled.
230 */
231
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200232 .globl system_call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233system_call:
234 STORE_TIMER __LC_SYNC_ENTER_TIMER
235sysc_saveall:
236 SAVE_ALL_BASE __LC_SAVE_AREA
Martin Schwidefsky987ad702007-07-10 11:24:18 +0200237 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200238 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
239 llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240#ifdef CONFIG_VIRT_CPU_ACCOUNTING
241sysc_vtime:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
243sysc_stime:
244 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
245sysc_update:
246 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
247#endif
248sysc_do_svc:
249 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200250 slag %r7,%r7,2 # *4 and test for svc 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 jnz sysc_nr_ok
252 # svc 0: system call number in %r1
253 cl %r1,BASED(.Lnr_syscalls)
254 jnl sysc_nr_ok
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200255 lgfr %r7,%r1 # clear high word in r1
256 slag %r7,%r7,2 # svc 0: system call number in %r1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257sysc_nr_ok:
258 mvc SP_ARGS(8,%r15),SP_R7(%r15)
259sysc_do_restart:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200260 larl %r10,sys_call_table
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800261#ifdef CONFIG_COMPAT
Heiko Carstensc5630772005-09-03 15:58:04 -0700262 tm __TI_flags+5(%r9),(_TIF_31BIT>>16) # running in 31 bit mode ?
263 jno sysc_noemu
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200264 larl %r10,sys_call_table_emu # use 31 bit emulation system calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265sysc_noemu:
266#endif
267 tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200268 lgf %r8,0(%r7,%r10) # load address of system call routine
269 jnz sysc_tracesys
270 basr %r14,%r8 # call sys_xxxx
271 stg %r2,SP_R2(%r15) # store return value (change R2 on stack)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273sysc_return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 tm __TI_flags+7(%r9),_TIF_WORK_SVC
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200275 jnz sysc_work # there is work to do (signals etc.)
Heiko Carstens411788e2007-11-20 11:13:32 +0100276sysc_restore:
277#ifdef CONFIG_TRACE_IRQFLAGS
278 larl %r1,sysc_restore_trace_psw
279 lpswe 0(%r1)
280sysc_restore_trace:
281 TRACE_IRQS_CHECK
Heiko Carstens523b44c2007-10-11 22:11:12 +0200282 LOCKDEP_SYS_EXIT
Heiko Carstens411788e2007-11-20 11:13:32 +0100283#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284sysc_leave:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200285 RESTORE_ALL __LC_RETURN_PSW,1
Heiko Carstens411788e2007-11-20 11:13:32 +0100286sysc_done:
287
288#ifdef CONFIG_TRACE_IRQFLAGS
289 .align 8
290 .globl sysc_restore_trace_psw
291sysc_restore_trace_psw:
292 .quad 0, sysc_restore_trace
293#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295#
296# recheck if there is more work to do
297#
298sysc_work_loop:
299 tm __TI_flags+7(%r9),_TIF_WORK_SVC
Heiko Carstens411788e2007-11-20 11:13:32 +0100300 jz sysc_restore # there is no work to do
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301#
302# One of the work bits is on. Find out which one.
303#
304sysc_work:
Martin Schwidefsky26889052008-05-07 09:22:52 +0200305 tm SP_PSW+1(%r15),0x01 # returning to user ?
306 jno sysc_restore
Heiko Carstens77fa2242005-06-25 14:55:30 -0700307 tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
308 jo sysc_mcck_pending
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
310 jo sysc_reschedule
Roland McGrath02a029b2008-04-30 00:53:08 -0700311 tm __TI_flags+7(%r9),_TIF_SIGPENDING
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -0800312 jnz sysc_sigpending
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 tm __TI_flags+7(%r9),_TIF_RESTART_SVC
314 jo sysc_restart
315 tm __TI_flags+7(%r9),_TIF_SINGLE_STEP
316 jo sysc_singlestep
Heiko Carstens411788e2007-11-20 11:13:32 +0100317 j sysc_restore
318sysc_work_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320#
321# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200322#
323sysc_reschedule:
324 larl %r14,sysc_work_loop
325 jg schedule # return point is sysc_return
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327#
Heiko Carstens77fa2242005-06-25 14:55:30 -0700328# _TIF_MCCK_PENDING is set, call handler
329#
330sysc_mcck_pending:
331 larl %r14,sysc_work_loop
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200332 jg s390_handle_mcck # TIF bit will be cleared by handler
Heiko Carstens77fa2242005-06-25 14:55:30 -0700333
334#
Roland McGrath02a029b2008-04-30 00:53:08 -0700335# _TIF_SIGPENDING is set, call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336#
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200337sysc_sigpending:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200339 la %r2,SP_PTREGS(%r15) # load pt_regs
340 brasl %r14,do_signal # call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 tm __TI_flags+7(%r9),_TIF_RESTART_SVC
342 jo sysc_restart
343 tm __TI_flags+7(%r9),_TIF_SINGLE_STEP
344 jo sysc_singlestep
Heiko Carstense1c3ad92005-11-07 00:59:02 -0800345 j sysc_work_loop
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
347#
348# _TIF_RESTART_SVC is set, set up registers and restart svc
349#
350sysc_restart:
351 ni __TI_flags+7(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200352 lg %r7,SP_R2(%r15) # load new svc number
353 slag %r7,%r7,2 # *4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 mvc SP_R2(8,%r15),SP_ORIG_R2(%r15) # restore first argument
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200355 lmg %r2,%r6,SP_R2(%r15) # load svc arguments
356 j sysc_do_restart # restart svc
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358#
359# _TIF_SINGLE_STEP is set, call do_single_step
360#
361sysc_singlestep:
362 ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
363 lhi %r0,__LC_PGM_OLD_PSW
364 sth %r0,SP_TRAP(%r15) # set trap indication to pgm check
365 la %r2,SP_PTREGS(%r15) # address of register-save area
366 larl %r14,sysc_return # load adr. of system return
367 jg do_single_step # branch to do_sigtrap
368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369#
370# call syscall_trace before and after system call
371# special linkage: %r12 contains the return address for trace_svc
372#
373sysc_tracesys:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200374 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 la %r3,0
376 srl %r7,2
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200377 stg %r7,SP_R2(%r15)
378 brasl %r14,syscall_trace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 lghi %r0,NR_syscalls
380 clg %r0,SP_R2(%r15)
381 jnh sysc_tracenogo
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200382 lg %r7,SP_R2(%r15) # strace might have changed the
383 sll %r7,2 # system call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 lgf %r8,0(%r7,%r10)
385sysc_tracego:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200386 lmg %r3,%r6,SP_R3(%r15)
387 lg %r2,SP_ORIG_R2(%r15)
388 basr %r14,%r8 # call sys_xxx
389 stg %r2,SP_R2(%r15) # store return value
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390sysc_tracenogo:
391 tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200392 jz sysc_return
393 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 la %r3,1
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200395 larl %r14,sysc_return # return point is sysc_return
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 jg syscall_trace
397
398#
399# a new process exits the kernel with ret_from_fork
400#
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200401 .globl ret_from_fork
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402ret_from_fork:
403 lg %r13,__LC_SVC_NEW_PSW+8
404 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
405 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ?
406 jo 0f
407 stg %r15,SP_R15(%r15) # store stack pointer for new kthread
Heiko Carstens25d83cb2006-09-28 16:56:37 +02004080: brasl %r14,schedule_tail
Heiko Carstens1f194a42006-07-03 00:24:46 -0700409 TRACE_IRQS_ON
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200410 stosm 24(%r15),0x03 # reenable interrupts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 j sysc_return
412
413#
Martin Schwidefsky03ff9a22007-04-27 16:01:40 +0200414# kernel_execve function needs to deal with pt_regs that is not
415# at the usual place
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416#
Martin Schwidefsky03ff9a22007-04-27 16:01:40 +0200417 .globl kernel_execve
418kernel_execve:
419 stmg %r12,%r15,96(%r15)
420 lgr %r14,%r15
421 aghi %r15,-SP_SIZE
422 stg %r14,__SF_BACKCHAIN(%r15)
423 la %r12,SP_PTREGS(%r15)
424 xc 0(__PT_SIZE,%r12),0(%r12)
425 lgr %r5,%r12
426 brasl %r14,do_execve
427 ltgfr %r2,%r2
428 je 0f
429 aghi %r15,SP_SIZE
430 lmg %r12,%r15,96(%r15)
431 br %r14
432 # execve succeeded.
4330: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts
434 lg %r15,__LC_KERNEL_STACK # load ksp
435 aghi %r15,-SP_SIZE # make room for registers & psw
436 lg %r13,__LC_SVC_NEW_PSW+8
437 lg %r9,__LC_THREAD_INFO
438 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs
439 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
440 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
441 brasl %r14,execve_tail
442 j sysc_return
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444/*
445 * Program check handler routine
446 */
447
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200448 .globl pgm_check_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449pgm_check_handler:
450/*
451 * First we need to check for a special case:
452 * Single stepping an instruction that disables the PER event mask will
453 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
454 * For a single stepped SVC the program check handler gets control after
455 * the SVC new PSW has been loaded. But we want to execute the SVC first and
456 * then handle the PER event. Therefore we update the SVC old PSW to point
457 * to the pgm_check_handler and branch to the SVC handler after we checked
458 * if we have to load the kernel stack register.
459 * For every other possible cause for PER event without the PER mask set
460 * we just ignore the PER event (FIXME: is there anything we have to do
461 * for LPSW?).
462 */
463 STORE_TIMER __LC_SYNC_ENTER_TIMER
464 SAVE_ALL_BASE __LC_SAVE_AREA
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200465 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
466 jnz pgm_per # got per exception -> special case
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200467 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700468 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469#ifdef CONFIG_VIRT_CPU_ACCOUNTING
470 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
471 jz pgm_no_vtime
472 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
473 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
474 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
475pgm_no_vtime:
476#endif
477 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Christian Borntraeger9e74a6b82008-04-17 07:46:30 +0200478 mvc SP_ARGS(8,%r15),__LC_LAST_BREAK
Heiko Carstens411788e2007-11-20 11:13:32 +0100479 TRACE_IRQS_OFF
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200480 lgf %r3,__LC_PGM_ILC # load program interruption code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 lghi %r8,0x7f
482 ngr %r8,%r3
483pgm_do_call:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200484 sll %r8,3
485 larl %r1,pgm_check_table
486 lg %r1,0(%r8,%r1) # load address of handler routine
487 la %r2,SP_PTREGS(%r15) # address of register-save area
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 larl %r14,sysc_return
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200489 br %r1 # branch to interrupt-handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491#
492# handle per exception
493#
494pgm_per:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200495 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on
496 jnz pgm_per_std # ok, normal per event from user space
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497# ok its one of the special cases, now we need to find out which one
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200498 clc __LC_PGM_OLD_PSW(16),__LC_SVC_NEW_PSW
499 je pgm_svcper
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500# no interesting special case, ignore PER event
501 lmg %r12,%r15,__LC_SAVE_AREA
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200502 lpswe __LC_PGM_OLD_PSW
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504#
505# Normal per exception
506#
507pgm_per_std:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200508 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700509 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510#ifdef CONFIG_VIRT_CPU_ACCOUNTING
511 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
512 jz pgm_no_vtime2
513 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
514 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
515 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
516pgm_no_vtime2:
517#endif
518 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens411788e2007-11-20 11:13:32 +0100519 TRACE_IRQS_OFF
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 lg %r1,__TI_task(%r9)
Michael Grundy4ba069b2006-09-20 15:58:39 +0200521 tm SP_PSW+1(%r15),0x01 # kernel per event ?
522 jz kernel_per
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
524 mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
525 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
526 oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200527 lgf %r3,__LC_PGM_ILC # load program interruption code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 lghi %r8,0x7f
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200529 ngr %r8,%r3 # clear per-event-bit and ilc
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 je sysc_return
531 j pgm_do_call
532
533#
534# it was a single stepped SVC that is causing all the trouble
535#
536pgm_svcper:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200537 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700538 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
541 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
542 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543#endif
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200544 llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
546 lg %r1,__TI_task(%r9)
547 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
548 mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
549 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
550 oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
Heiko Carstens1f194a42006-07-03 00:24:46 -0700551 TRACE_IRQS_ON
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
553 j sysc_do_svc
554
Michael Grundy4ba069b2006-09-20 15:58:39 +0200555#
556# per was called from kernel, must be kprobes
557#
558kernel_per:
559 lhi %r0,__LC_PGM_OLD_PSW
560 sth %r0,SP_TRAP(%r15) # set trap indication to pgm check
561 la %r2,SP_PTREGS(%r15) # address of register-save area
Heiko Carstens411788e2007-11-20 11:13:32 +0100562 larl %r14,sysc_restore # load adr. of system ret, no work
Michael Grundy4ba069b2006-09-20 15:58:39 +0200563 jg do_single_step # branch to do_single_step
564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565/*
566 * IO interrupt handler routine
567 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200568 .globl io_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569io_int_handler:
570 STORE_TIMER __LC_ASYNC_ENTER_TIMER
571 stck __LC_INT_CLOCK
572 SAVE_ALL_BASE __LC_SAVE_AREA+32
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200573 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
Heiko Carstens77fa2242005-06-25 14:55:30 -0700574 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575#ifdef CONFIG_VIRT_CPU_ACCOUNTING
576 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
577 jz io_no_vtime
578 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
579 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
580 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
581io_no_vtime:
582#endif
583 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens1f194a42006-07-03 00:24:46 -0700584 TRACE_IRQS_OFF
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200585 la %r2,SP_PTREGS(%r15) # address of register-save area
586 brasl %r14,do_IRQ # call standard irq handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587io_return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 tm __TI_flags+7(%r9),_TIF_WORK_INT
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200589 jnz io_work # there is work to do (signals etc.)
Heiko Carstens411788e2007-11-20 11:13:32 +0100590io_restore:
591#ifdef CONFIG_TRACE_IRQFLAGS
592 larl %r1,io_restore_trace_psw
593 lpswe 0(%r1)
594io_restore_trace:
595 TRACE_IRQS_CHECK
Heiko Carstens523b44c2007-10-11 22:11:12 +0200596 LOCKDEP_SYS_EXIT
Heiko Carstens411788e2007-11-20 11:13:32 +0100597#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598io_leave:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200599 RESTORE_ALL __LC_RETURN_PSW,0
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700600io_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
Heiko Carstens411788e2007-11-20 11:13:32 +0100602#ifdef CONFIG_TRACE_IRQFLAGS
603 .align 8
604 .globl io_restore_trace_psw
605io_restore_trace_psw:
606 .quad 0, io_restore_trace
607#endif
608
Martin Schwidefsky26889052008-05-07 09:22:52 +0200609#
Christian Borntraeger0eaeafa2008-05-07 09:22:53 +0200610# There is work todo, we need to check if we return to userspace, then
611# check, if we are in SIE, if yes leave it
Martin Schwidefsky26889052008-05-07 09:22:52 +0200612#
613io_work:
614 tm SP_PSW+1(%r15),0x01 # returning to user ?
615#ifndef CONFIG_PREEMPT
Christian Borntraeger0eaeafa2008-05-07 09:22:53 +0200616#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
617 jnz io_work_user # yes -> no need to check for SIE
618 la %r1, BASED(sie_opcode) # we return to kernel here
619 lg %r2, SP_PSW+8(%r15)
620 clc 0(2,%r1), 0(%r2) # is current instruction = SIE?
621 jne io_restore # no-> return to kernel
622 lg %r1, SP_PSW+8(%r15) # yes-> add 4 bytes to leave SIE
623 aghi %r1, 4
624 stg %r1, SP_PSW+8(%r15)
625 j io_restore # return to kernel
626#else
Martin Schwidefsky26889052008-05-07 09:22:52 +0200627 jno io_restore # no-> skip resched & signal
Christian Borntraeger0eaeafa2008-05-07 09:22:53 +0200628#endif
Martin Schwidefsky26889052008-05-07 09:22:52 +0200629#else
630 jnz io_work_user # yes -> do resched & signal
Christian Borntraeger0eaeafa2008-05-07 09:22:53 +0200631#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
632 la %r1, BASED(sie_opcode)
633 lg %r2, SP_PSW+8(%r15)
634 clc 0(2,%r1), 0(%r2) # is current instruction = SIE?
635 jne 0f # no -> leave PSW alone
636 lg %r1, SP_PSW+8(%r15) # yes-> add 4 bytes to leave SIE
637 aghi %r1, 4
638 stg %r1, SP_PSW+8(%r15)
6390:
640#endif
Martin Schwidefsky26889052008-05-07 09:22:52 +0200641 # check for preemptive scheduling
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200642 icm %r0,15,__TI_precount(%r9)
Martin Schwidefsky26889052008-05-07 09:22:52 +0200643 jnz io_restore # preemption is disabled
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 # switch to kernel stack
645 lg %r1,SP_R15(%r15)
646 aghi %r1,-SP_SIZE
647 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200648 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 lgr %r15,%r1
650io_resume_loop:
651 tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
Heiko Carstens411788e2007-11-20 11:13:32 +0100652 jno io_restore
Heiko Carstensb8e7a542007-11-20 11:13:35 +0100653 larl %r14,io_resume_loop
654 jg preempt_schedule_irq
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655#endif
656
Martin Schwidefsky26889052008-05-07 09:22:52 +0200657io_work_user:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 lg %r1,__LC_KERNEL_STACK
659 aghi %r1,-SP_SIZE
660 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200661 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 lgr %r15,%r1
663#
664# One of the work bits is on. Find out which one.
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -0800665# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGPENDING, _TIF_NEED_RESCHED
666# and _TIF_MCCK_PENDING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667#
668io_work_loop:
Heiko Carstens77fa2242005-06-25 14:55:30 -0700669 tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
670 jo io_mcck_pending
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
672 jo io_reschedule
Roland McGrath02a029b2008-04-30 00:53:08 -0700673 tm __TI_flags+7(%r9),_TIF_SIGPENDING
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -0800674 jnz io_sigpending
Heiko Carstens411788e2007-11-20 11:13:32 +0100675 j io_restore
676io_work_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
Christian Borntraeger0eaeafa2008-05-07 09:22:53 +0200678#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
679sie_opcode:
680 .long 0xb2140000
681#endif
682
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683#
Heiko Carstens77fa2242005-06-25 14:55:30 -0700684# _TIF_MCCK_PENDING is set, call handler
685#
686io_mcck_pending:
Heiko Carstensb771aea2007-07-27 12:29:18 +0200687 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler
Heiko Carstensb771aea2007-07-27 12:29:18 +0200688 j io_work_loop
Heiko Carstens77fa2242005-06-25 14:55:30 -0700689
690#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200692#
693io_reschedule:
Heiko Carstens411788e2007-11-20 11:13:32 +0100694 TRACE_IRQS_ON
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200695 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
696 brasl %r14,schedule # call scheduler
697 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
Heiko Carstens411788e2007-11-20 11:13:32 +0100698 TRACE_IRQS_OFF
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 tm __TI_flags+7(%r9),_TIF_WORK_INT
Heiko Carstens411788e2007-11-20 11:13:32 +0100700 jz io_restore # there is no work to do
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 j io_work_loop
702
703#
Roland McGrath02a029b2008-04-30 00:53:08 -0700704# _TIF_SIGPENDING or is set, call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705#
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200706io_sigpending:
Heiko Carstens411788e2007-11-20 11:13:32 +0100707 TRACE_IRQS_ON
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200708 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
709 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 brasl %r14,do_signal # call do_signal
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200711 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
Heiko Carstens411788e2007-11-20 11:13:32 +0100712 TRACE_IRQS_OFF
Heiko Carstense1c3ad92005-11-07 00:59:02 -0800713 j io_work_loop
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
715/*
716 * External interrupt handler routine
717 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200718 .globl ext_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719ext_int_handler:
720 STORE_TIMER __LC_ASYNC_ENTER_TIMER
721 stck __LC_INT_CLOCK
722 SAVE_ALL_BASE __LC_SAVE_AREA+32
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200723 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
Heiko Carstens77fa2242005-06-25 14:55:30 -0700724 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725#ifdef CONFIG_VIRT_CPU_ACCOUNTING
726 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
727 jz ext_no_vtime
728 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
729 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
730 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
731ext_no_vtime:
732#endif
733 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens1f194a42006-07-03 00:24:46 -0700734 TRACE_IRQS_OFF
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200735 la %r2,SP_PTREGS(%r15) # address of register-save area
736 llgh %r3,__LC_EXT_INT_CODE # get interruption code
737 brasl %r14,do_extint
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 j io_return
739
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700740__critical_end:
741
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742/*
743 * Machine check handler routines
744 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200745 .globl mcck_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746mcck_int_handler:
Heiko Carstens77fa2242005-06-25 14:55:30 -0700747 la %r1,4095 # revalidate r1
748 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200749 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 SAVE_ALL_BASE __LC_SAVE_AREA+64
Heiko Carstens77fa2242005-06-25 14:55:30 -0700751 la %r12,__LC_MCK_OLD_PSW
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200752 tm __LC_MCCK_CODE,0x80 # system damage?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700753 jo mcck_int_main # yes -> rest of mcck code invalid
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200755 la %r14,4095
756 mvc __LC_SAVE_AREA+104(8),__LC_ASYNC_ENTER_TIMER
757 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r14)
758 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
759 jo 1f
760 la %r14,__LC_SYNC_ENTER_TIMER
761 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
762 jl 0f
763 la %r14,__LC_ASYNC_ENTER_TIMER
7640: clc 0(8,%r14),__LC_EXIT_TIMER
765 jl 0f
766 la %r14,__LC_EXIT_TIMER
7670: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
768 jl 0f
769 la %r14,__LC_LAST_UPDATE_TIMER
7700: spt 0(%r14)
771 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14)
7721:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773#endif
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200774 tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700775 jno mcck_int_main # no -> skip cleanup critical
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200776 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
Heiko Carstens77fa2242005-06-25 14:55:30 -0700777 jnz mcck_int_main # from user -> load kernel stack
778 clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_end)
779 jhe mcck_int_main
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200780 clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_start)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700781 jl mcck_int_main
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200782 brasl %r14,cleanup_critical
Heiko Carstens77fa2242005-06-25 14:55:30 -0700783mcck_int_main:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200784 lg %r14,__LC_PANIC_STACK # are we already on the panic stack?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700785 slgr %r14,%r15
786 srag %r14,%r14,PAGE_SHIFT
787 jz 0f
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200788 lg %r15,__LC_PANIC_STACK # load panic stack
Heiko Carstens77fa2242005-06-25 14:55:30 -07007890: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700790#ifdef CONFIG_VIRT_CPU_ACCOUNTING
791 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
792 jno mcck_no_vtime # no -> no timer update
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200793 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700794 jz mcck_no_vtime
795 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
796 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
797 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
798mcck_no_vtime:
799#endif
Heiko Carstens77fa2242005-06-25 14:55:30 -0700800 lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
801 la %r2,SP_PTREGS(%r15) # load pt_regs
802 brasl %r14,s390_do_machine_check
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200803 tm SP_PSW+1(%r15),0x01 # returning to user ?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700804 jno mcck_return
805 lg %r1,__LC_KERNEL_STACK # switch to kernel stack
806 aghi %r1,-SP_SIZE
807 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
808 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
809 lgr %r15,%r1
810 stosm __SF_EMPTY(%r15),0x04 # turn dat on
811 tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
812 jno mcck_return
Heiko Carstens1f194a42006-07-03 00:24:46 -0700813 TRACE_IRQS_OFF
Heiko Carstens77fa2242005-06-25 14:55:30 -0700814 brasl %r14,s390_handle_mcck
Heiko Carstens1f194a42006-07-03 00:24:46 -0700815 TRACE_IRQS_ON
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816mcck_return:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200817 mvc __LC_RETURN_MCCK_PSW(16),SP_PSW(%r15) # move return PSW
818 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
819 lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15
820#ifdef CONFIG_VIRT_CPU_ACCOUNTING
821 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+104
822 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
823 jno 0f
824 stpt __LC_EXIT_TIMER
8250:
826#endif
827 lpswe __LC_RETURN_MCCK_PSW # back to caller
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829/*
830 * Restart interruption handler, kick starter for additional CPUs
831 */
Heiko Carstens84b36a82007-06-19 13:10:03 +0200832#ifdef CONFIG_SMP
Heiko Carstens2bc89b52008-02-05 16:50:40 +0100833 __CPUINIT
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200834 .globl restart_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835restart_int_handler:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200836 lg %r15,__LC_SAVE_AREA+120 # load ksp
837 lghi %r10,__LC_CREGS_SAVE_AREA
838 lctlg %c0,%c15,0(%r10) # get new ctl regs
839 lghi %r10,__LC_AREGS_SAVE_AREA
840 lam %a0,%a15,0(%r10)
841 lmg %r6,%r15,__SF_GPRS(%r15) # load registers from clone
842 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on
843 jg start_secondary
Heiko Carstens84b36a82007-06-19 13:10:03 +0200844 .previous
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845#else
846/*
847 * If we do not run with SMP enabled, let the new CPU crash ...
848 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200849 .globl restart_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850restart_int_handler:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200851 basr %r1,0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852restart_base:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200853 lpswe restart_crash-restart_base(%r1)
854 .align 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855restart_crash:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200856 .long 0x000a0000,0x00000000,0x00000000,0x00000000
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857restart_go:
858#endif
859
860#ifdef CONFIG_CHECK_STACK
861/*
862 * The synchronous or the asynchronous stack overflowed. We are dead.
863 * No need to properly save the registers, we are going to panic anyway.
864 * Setup a pt_regs so that show_trace can provide a good call trace.
865 */
866stack_overflow:
867 lg %r15,__LC_PANIC_STACK # change to panic stack
Heiko Carstens9514e232006-09-20 15:59:22 +0200868 aghi %r15,-SP_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
870 stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
871 la %r1,__LC_SAVE_AREA
872 chi %r12,__LC_SVC_OLD_PSW
873 je 0f
874 chi %r12,__LC_PGM_OLD_PSW
875 je 0f
Heiko Carstens9514e232006-09-20 15:59:22 +0200876 la %r1,__LC_SAVE_AREA+32
Heiko Carstens25d83cb2006-09-28 16:56:37 +02008770: mvc SP_R12(32,%r15),0(%r1) # move %r12-%r15 to stack
Christian Borntraeger9e74a6b82008-04-17 07:46:30 +0200878 mvc SP_ARGS(8,%r15),__LC_LAST_BREAK
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200879 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain
880 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 jg kernel_stack_overflow
882#endif
883
884cleanup_table_system_call:
885 .quad system_call, sysc_do_svc
886cleanup_table_sysc_return:
887 .quad sysc_return, sysc_leave
888cleanup_table_sysc_leave:
Heiko Carstens411788e2007-11-20 11:13:32 +0100889 .quad sysc_leave, sysc_done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890cleanup_table_sysc_work_loop:
Heiko Carstens411788e2007-11-20 11:13:32 +0100891 .quad sysc_work_loop, sysc_work_done
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200892cleanup_table_io_return:
893 .quad io_return, io_leave
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700894cleanup_table_io_leave:
895 .quad io_leave, io_done
896cleanup_table_io_work_loop:
Heiko Carstens411788e2007-11-20 11:13:32 +0100897 .quad io_work_loop, io_work_done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899cleanup_critical:
900 clc 8(8,%r12),BASED(cleanup_table_system_call)
901 jl 0f
902 clc 8(8,%r12),BASED(cleanup_table_system_call+8)
903 jl cleanup_system_call
9040:
905 clc 8(8,%r12),BASED(cleanup_table_sysc_return)
906 jl 0f
907 clc 8(8,%r12),BASED(cleanup_table_sysc_return+8)
908 jl cleanup_sysc_return
9090:
910 clc 8(8,%r12),BASED(cleanup_table_sysc_leave)
911 jl 0f
912 clc 8(8,%r12),BASED(cleanup_table_sysc_leave+8)
913 jl cleanup_sysc_leave
9140:
915 clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop)
916 jl 0f
917 clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700918 jl cleanup_sysc_return
Linus Torvalds1da177e2005-04-16 15:20:36 -07009190:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200920 clc 8(8,%r12),BASED(cleanup_table_io_return)
921 jl 0f
922 clc 8(8,%r12),BASED(cleanup_table_io_return+8)
923 jl cleanup_io_return
9240:
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700925 clc 8(8,%r12),BASED(cleanup_table_io_leave)
926 jl 0f
927 clc 8(8,%r12),BASED(cleanup_table_io_leave+8)
928 jl cleanup_io_leave
9290:
930 clc 8(8,%r12),BASED(cleanup_table_io_work_loop)
931 jl 0f
932 clc 8(8,%r12),BASED(cleanup_table_io_work_loop+8)
933 jl cleanup_io_return
9340:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 br %r14
936
937cleanup_system_call:
938 mvc __LC_RETURN_PSW(16),0(%r12)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700939 cghi %r12,__LC_MCK_OLD_PSW
940 je 0f
941 la %r12,__LC_SAVE_AREA+32
942 j 1f
9430: la %r12,__LC_SAVE_AREA+64
9441:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945#ifdef CONFIG_VIRT_CPU_ACCOUNTING
946 clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8)
947 jh 0f
948 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
9490: clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16)
950 jhe cleanup_vtime
951#endif
952 clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn)
953 jh 0f
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700954 mvc __LC_SAVE_AREA(32),0(%r12)
9550: stg %r13,8(%r12)
956 stg %r12,__LC_SAVE_AREA+96 # argh
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200957 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700958 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700959 lg %r12,__LC_SAVE_AREA+96 # argh
960 stg %r15,24(%r12)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 llgh %r7,__LC_SVC_INT_CODE
962#ifdef CONFIG_VIRT_CPU_ACCOUNTING
963cleanup_vtime:
964 clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)
965 jhe cleanup_stime
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
967cleanup_stime:
968 clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+32)
969 jh cleanup_update
970 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
971cleanup_update:
972 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973#endif
974 mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8)
975 la %r12,__LC_RETURN_PSW
976 br %r14
977cleanup_system_call_insn:
978 .quad sysc_saveall
979#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200980 .quad system_call
981 .quad sysc_vtime
982 .quad sysc_stime
983 .quad sysc_update
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984#endif
985
986cleanup_sysc_return:
987 mvc __LC_RETURN_PSW(8),0(%r12)
988 mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return)
989 la %r12,__LC_RETURN_PSW
990 br %r14
991
992cleanup_sysc_leave:
993 clc 8(8,%r12),BASED(cleanup_sysc_leave_insn)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700994 je 2f
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995#ifdef CONFIG_VIRT_CPU_ACCOUNTING
996 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
997 clc 8(8,%r12),BASED(cleanup_sysc_leave_insn+8)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700998 je 2f
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999#endif
1000 mvc __LC_RETURN_PSW(16),SP_PSW(%r15)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001001 cghi %r12,__LC_MCK_OLD_PSW
1002 jne 0f
1003 mvc __LC_SAVE_AREA+64(32),SP_R12(%r15)
1004 j 1f
10050: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15)
10061: lmg %r0,%r11,SP_R0(%r15)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 lg %r15,SP_R15(%r15)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -070010082: la %r12,__LC_RETURN_PSW
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 br %r14
1010cleanup_sysc_leave_insn:
Heiko Carstens411788e2007-11-20 11:13:32 +01001011 .quad sysc_done - 4
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Heiko Carstens411788e2007-11-20 11:13:32 +01001013 .quad sysc_done - 8
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001016cleanup_io_return:
1017 mvc __LC_RETURN_PSW(8),0(%r12)
1018 mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_io_work_loop)
1019 la %r12,__LC_RETURN_PSW
1020 br %r14
1021
1022cleanup_io_leave:
1023 clc 8(8,%r12),BASED(cleanup_io_leave_insn)
1024 je 2f
1025#ifdef CONFIG_VIRT_CPU_ACCOUNTING
1026 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
1027 clc 8(8,%r12),BASED(cleanup_io_leave_insn+8)
1028 je 2f
1029#endif
1030 mvc __LC_RETURN_PSW(16),SP_PSW(%r15)
1031 cghi %r12,__LC_MCK_OLD_PSW
1032 jne 0f
1033 mvc __LC_SAVE_AREA+64(32),SP_R12(%r15)
1034 j 1f
10350: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15)
10361: lmg %r0,%r11,SP_R0(%r15)
1037 lg %r15,SP_R15(%r15)
10382: la %r12,__LC_RETURN_PSW
1039 br %r14
1040cleanup_io_leave_insn:
Heiko Carstens411788e2007-11-20 11:13:32 +01001041 .quad io_done - 4
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001042#ifdef CONFIG_VIRT_CPU_ACCOUNTING
Heiko Carstens411788e2007-11-20 11:13:32 +01001043 .quad io_done - 8
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001044#endif
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001045
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046/*
1047 * Integer constants
1048 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001049 .align 4
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050.Lconst:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001051.Lnr_syscalls: .long NR_syscalls
1052.L0x0130: .short 0x130
1053.L0x0140: .short 0x140
1054.L0x0150: .short 0x150
1055.L0x0160: .short 0x160
1056.L0x0170: .short 0x170
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057.Lcritical_start:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001058 .quad __critical_start
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059.Lcritical_end:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001060 .quad __critical_end
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001062 .section .rodata, "a"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063#define SYSCALL(esa,esame,emu) .long esame
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064sys_call_table:
1065#include "syscalls.S"
1066#undef SYSCALL
1067
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -08001068#ifdef CONFIG_COMPAT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069
1070#define SYSCALL(esa,esame,emu) .long emu
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071sys_call_table_emu:
1072#include "syscalls.S"
1073#undef SYSCALL
1074#endif