blob: 1ecc337fb679045e968ef1915ea009c4777786de [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * arch/s390/kernel/entry.S
3 * S390 low-level entry points.
4 *
Heiko Carstens54dfe5d2006-02-01 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <asm/errno.h>
17#include <asm/ptrace.h>
18#include <asm/thread_info.h>
Sam Ravnborg0013a852005-09-09 20:57:26 +020019#include <asm/asm-offsets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <asm/unistd.h>
21#include <asm/page.h>
22
23/*
24 * Stack layout for the system_call stack entry.
25 * The first few entries are identical to the user_regs_struct.
26 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +020027SP_PTREGS = STACK_FRAME_OVERHEAD
28SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS
29SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
30SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS
31SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4
32SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
33SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12
34SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
35SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20
36SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
37SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28
38SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
39SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36
40SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
41SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44
42SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
43SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52
44SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
45SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60
46SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
47SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC
Martin Schwidefsky59da2132008-11-27 11:05:55 +010048SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR
Heiko Carstens25d83cb2006-09-28 16:56:37 +020049SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +020051_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
Heiko Carstens54dfe5d2006-02-01 03:06:38 -080052 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +020053_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
Heiko Carstens54dfe5d2006-02-01 03:06:38 -080054 _TIF_MCCK_PENDING)
Heiko Carstens9bf12262009-06-12 10:26:47 +020055_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
Josh Stone66700002009-08-24 14:43:11 -070056 _TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
59STACK_SIZE = 1 << STACK_SHIFT
60
61#define BASED(name) name-system_call(%r13)
62
Heiko Carstens1f194a42006-07-03 00:24:46 -070063#ifdef CONFIG_TRACE_IRQFLAGS
64 .macro TRACE_IRQS_ON
Heiko Carstens50bec4c2008-11-14 18:18:05 +010065 basr %r2,%r0
66 l %r1,BASED(.Ltrace_irq_on_caller)
Heiko Carstens1f194a42006-07-03 00:24:46 -070067 basr %r14,%r1
68 .endm
69
70 .macro TRACE_IRQS_OFF
Heiko Carstens50bec4c2008-11-14 18:18:05 +010071 basr %r2,%r0
72 l %r1,BASED(.Ltrace_irq_off_caller)
Heiko Carstens1f194a42006-07-03 00:24:46 -070073 basr %r14,%r1
74 .endm
75#else
76#define TRACE_IRQS_ON
77#define TRACE_IRQS_OFF
Heiko Carstens411788e2007-11-20 11:13:32 +010078#endif
79
80#ifdef CONFIG_LOCKDEP
81 .macro LOCKDEP_SYS_EXIT
82 tm SP_PSW+1(%r15),0x01 # returning to user ?
83 jz 0f
84 l %r1,BASED(.Llockdep_sys_exit)
85 basr %r14,%r1
860:
87 .endm
88#else
Heiko Carstens523b44c2007-10-11 22:11:12 +020089#define LOCKDEP_SYS_EXIT
Heiko Carstens1f194a42006-07-03 00:24:46 -070090#endif
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092/*
93 * Register usage in interrupt handlers:
94 * R9 - pointer to current task structure
95 * R13 - pointer to literal pool
96 * R14 - return register for function calls
97 * R15 - kernel stack pointer
98 */
99
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200100 .macro UPDATE_VTIME lc_from,lc_to,lc_sum
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 lm %r10,%r11,\lc_from
102 sl %r10,\lc_to
103 sl %r11,\lc_to+4
104 bc 3,BASED(0f)
105 sl %r10,BASED(.Lc_1)
1060: al %r10,\lc_sum
107 al %r11,\lc_sum+4
108 bc 12,BASED(1f)
109 al %r10,BASED(.Lc_1)
1101: stm %r10,%r11,\lc_sum
111 .endm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 .macro SAVE_ALL_BASE savearea
114 stm %r12,%r15,\savearea
115 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
116 .endm
117
Martin Schwidefsky987ad702007-07-10 11:24:18 +0200118 .macro SAVE_ALL_SVC psworg,savearea
119 la %r12,\psworg
120 l %r15,__LC_KERNEL_STACK # problem state -> load ksp
121 .endm
122
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200123 .macro SAVE_ALL_SYNC psworg,savearea
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 la %r12,\psworg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 tm \psworg+1,0x01 # test problem state bit
126 bz BASED(2f) # skip stack setup save
127 l %r15,__LC_KERNEL_STACK # problem state -> load ksp
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200128#ifdef CONFIG_CHECK_STACK
129 b BASED(3f)
1302: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
131 bz BASED(stack_overflow)
1323:
133#endif
1342:
135 .endm
136
137 .macro SAVE_ALL_ASYNC psworg,savearea
138 la %r12,\psworg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 tm \psworg+1,0x01 # test problem state bit
140 bnz BASED(1f) # from user -> load async stack
141 clc \psworg+4(4),BASED(.Lcritical_end)
142 bhe BASED(0f)
143 clc \psworg+4(4),BASED(.Lcritical_start)
144 bl BASED(0f)
145 l %r14,BASED(.Lcleanup_critical)
146 basr %r14,%r14
Peter Oberparleiter6add9f72005-09-16 19:27:42 -0700147 tm 1(%r12),0x01 # retest problem state after cleanup
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 bnz BASED(1f)
1490: l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
150 slr %r14,%r15
151 sra %r14,STACK_SHIFT
152 be BASED(2f)
1531: l %r15,__LC_ASYNC_STACK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154#ifdef CONFIG_CHECK_STACK
155 b BASED(3f)
1562: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
157 bz BASED(stack_overflow)
1583:
159#endif
Heiko Carstens77fa2242005-06-25 14:55:30 -07001602:
161 .endm
162
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200163 .macro CREATE_STACK_FRAME psworg,savearea
Heiko Carstens77fa2242005-06-25 14:55:30 -0700164 s %r15,BASED(.Lc_spsize) # make room for registers & psw
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
Martin Schwidefsky86f25522010-05-17 10:00:05 +0200167 icm %r12,12,__LC_SVC_ILC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
Martin Schwidefsky86f25522010-05-17 10:00:05 +0200169 st %r12,SP_ILC(%r15)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack
171 la %r12,0
172 st %r12,__SF_BACKCHAIN(%r15) # clear back chain
173 .endm
174
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200175 .macro RESTORE_ALL psworg,sync
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700176 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 .if !\sync
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700178 ni \psworg+1,0xfd # clear wait state bit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 .endif
180 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100181 stpt __LC_EXIT_TIMER
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700182 lpsw \psworg # back to caller
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 .endm
184
Martin Schwidefsky1e546222010-10-25 16:10:37 +0200185 .macro REENABLE_IRQS
186 mvc __SF_EMPTY(1,%r15),SP_PSW(%r15)
187 ni __SF_EMPTY(%r15),0xbf
188 ssm __SF_EMPTY(%r15)
189 .endm
190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191/*
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:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200200 basr %r1,0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201__switch_to_base:
202 tm __THREAD_per(%r3),0xe8 # new process is using per ?
203 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200204 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff
205 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15)
206 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's
207 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208__switch_to_noper:
Heiko Carstens77fa2242005-06-25 14:55:30 -0700209 l %r4,__THREAD_info(%r2) # get thread_info of prev
210 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
211 bz __switch_to_no_mcck-__switch_to_base(%r1)
212 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
213 l %r4,__THREAD_info(%r3) # get thread_info of next
214 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
215__switch_to_no_mcck:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200216 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
218 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
219 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
220 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct
221 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200222 l %r3,__THREAD_info(%r3) # load thread_info from task struct
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 st %r3,__LC_THREAD_INFO
224 ahi %r3,STACK_SIZE
225 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
226 br %r14
227
228__critical_start:
229/*
230 * SVC interrupt handler routine. System calls are synchronous events and
231 * are executed with interrupts enabled.
232 */
233
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200234 .globl system_call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235system_call:
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100236 stpt __LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237sysc_saveall:
238 SAVE_ALL_BASE __LC_SAVE_AREA
Martin Schwidefsky987ad702007-07-10 11:24:18 +0200239 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700240 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 lh %r7,0x8a # get svc number from lowcore
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242sysc_vtime:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
244sysc_stime:
245 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
246sysc_update:
247 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248sysc_do_svc:
249 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100250 ltr %r7,%r7 # test for svc 0
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200251 bnz BASED(sysc_nr_ok) # svc number > 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 # svc 0: system call number in %r1
253 cl %r1,BASED(.Lnr_syscalls)
254 bnl BASED(sysc_nr_ok)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200255 lr %r7,%r1 # copy svc number to %r7
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256sysc_nr_ok:
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100257 sth %r7,SP_SVCNR(%r15)
258 sll %r7,2 # svc number *4
Heiko Carstensd882b172006-07-01 04:36:31 -0700259 l %r8,BASED(.Lsysc_table)
Heiko Carstensbcf5cef2009-06-12 10:26:26 +0200260 tm __TI_flags+2(%r9),_TIF_SYSCALL
Martin Schwidefskybaa07152010-10-25 16:10:40 +0200261 mvc SP_ARGS(4,%r15),SP_R7(%r15)
Heiko Carstensd882b172006-07-01 04:36:31 -0700262 l %r8,0(%r7,%r8) # get system call addr.
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200263 bnz BASED(sysc_tracesys)
264 basr %r14,%r8 # call sys_xxxx
265 st %r2,SP_R2(%r15) # store return value (change R2 on stack)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267sysc_return:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200268 LOCKDEP_SYS_EXIT
269sysc_tif:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 tm __TI_flags+3(%r9),_TIF_WORK_SVC
271 bnz BASED(sysc_work) # there is work to do (signals etc.)
Heiko Carstens411788e2007-11-20 11:13:32 +0100272sysc_restore:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200273 RESTORE_ALL __LC_RETURN_PSW,1
Heiko Carstens411788e2007-11-20 11:13:32 +0100274sysc_done:
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276#
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200277# There is work to do, but first we need to check if we return to userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278#
279sysc_work:
Martin Schwidefsky26889052008-05-07 09:22:52 +0200280 tm SP_PSW+1(%r15),0x01 # returning to user ?
281 bno BASED(sysc_restore)
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200282
283#
284# One of the work bits is on. Find out which one.
285#
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200286sysc_work_tif:
Heiko Carstens77fa2242005-06-25 14:55:30 -0700287 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
288 bo BASED(sysc_mcck_pending)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
290 bo BASED(sysc_reschedule)
Roland McGrath02a029b2008-04-30 00:53:08 -0700291 tm __TI_flags+3(%r9),_TIF_SIGPENDING
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200292 bo BASED(sysc_sigpending)
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200293 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200294 bo BASED(sysc_notify_resume)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 tm __TI_flags+3(%r9),_TIF_RESTART_SVC
296 bo BASED(sysc_restart)
297 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
298 bo BASED(sysc_singlestep)
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200299 b BASED(sysc_return) # beware of critical section cleanup
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301#
302# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200303#
304sysc_reschedule:
305 l %r1,BASED(.Lschedule)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200306 la %r14,BASED(sysc_return)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200307 br %r1 # call scheduler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309#
Heiko Carstens77fa2242005-06-25 14:55:30 -0700310# _TIF_MCCK_PENDING is set, call handler
311#
312sysc_mcck_pending:
313 l %r1,BASED(.Ls390_handle_mcck)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200314 la %r14,BASED(sysc_return)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700315 br %r1 # TIF bit will be cleared by handler
316
317#
Roland McGrath02a029b2008-04-30 00:53:08 -0700318# _TIF_SIGPENDING is set, call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319#
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200320sysc_sigpending:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200322 la %r2,SP_PTREGS(%r15) # load pt_regs
323 l %r1,BASED(.Ldo_signal)
324 basr %r14,%r1 # call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 tm __TI_flags+3(%r9),_TIF_RESTART_SVC
326 bo BASED(sysc_restart)
327 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
328 bo BASED(sysc_singlestep)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200329 b BASED(sysc_return)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331#
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200332# _TIF_NOTIFY_RESUME is set, call do_notify_resume
333#
334sysc_notify_resume:
335 la %r2,SP_PTREGS(%r15) # load pt_regs
336 l %r1,BASED(.Ldo_notify_resume)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200337 la %r14,BASED(sysc_return)
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200338 br %r1 # call do_notify_resume
339
340
341#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342# _TIF_RESTART_SVC is set, set up registers and restart svc
343#
344sysc_restart:
345 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200346 l %r7,SP_R2(%r15) # load new svc number
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200348 lm %r2,%r6,SP_R2(%r15) # load svc arguments
Martin Schwidefskybaa07152010-10-25 16:10:40 +0200349 b BASED(sysc_nr_ok) # restart svc
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351#
352# _TIF_SINGLE_STEP is set, call do_single_step
353#
354sysc_singlestep:
355 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100356 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check
357 mvi SP_SVCNR+1(%r15),0xff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 la %r2,SP_PTREGS(%r15) # address of register-save area
359 l %r1,BASED(.Lhandle_per) # load adr. of per handler
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200360 la %r14,BASED(sysc_return) # load adr. of system return
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 br %r1 # branch to do_single_step
362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363#
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200364# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
365# and after the system call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366#
367sysc_tracesys:
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200368 l %r1,BASED(.Ltrace_entry)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200369 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 la %r3,0
371 srl %r7,2
372 st %r7,SP_R2(%r15)
373 basr %r14,%r1
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200374 cl %r2,BASED(.Lnr_syscalls)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 bnl BASED(sysc_tracenogo)
Heiko Carstensd882b172006-07-01 04:36:31 -0700376 l %r8,BASED(.Lsysc_table)
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200377 lr %r7,%r2
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100378 sll %r7,2 # svc number *4
Heiko Carstensd882b172006-07-01 04:36:31 -0700379 l %r8,0(%r7,%r8)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380sysc_tracego:
381 lm %r3,%r6,SP_R3(%r15)
Martin Schwidefskybaa07152010-10-25 16:10:40 +0200382 mvc SP_ARGS(4,%r15),SP_R7(%r15)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 l %r2,SP_ORIG_R2(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200384 basr %r14,%r8 # call sys_xxx
385 st %r2,SP_R2(%r15) # store return value
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386sysc_tracenogo:
Heiko Carstensbcf5cef2009-06-12 10:26:26 +0200387 tm __TI_flags+2(%r9),_TIF_SYSCALL
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200388 bz BASED(sysc_return)
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200389 l %r1,BASED(.Ltrace_exit)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200390 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 la %r14,BASED(sysc_return)
392 br %r1
393
394#
395# a new process exits the kernel with ret_from_fork
396#
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200397 .globl ret_from_fork
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398ret_from_fork:
399 l %r13,__LC_SVC_NEW_PSW+4
400 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
401 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ?
402 bo BASED(0f)
403 st %r15,SP_R15(%r15) # store stack pointer for new kthread
Heiko Carstens25d83cb2006-09-28 16:56:37 +02004040: l %r1,BASED(.Lschedtail)
405 basr %r14,%r1
Heiko Carstens1f194a42006-07-03 00:24:46 -0700406 TRACE_IRQS_ON
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200407 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
Al Viro8f2961c2008-12-25 13:37:58 +0100408 b BASED(sysc_tracenogo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
410#
Martin Schwidefsky03ff9a22007-04-27 16:01:40 +0200411# kernel_execve function needs to deal with pt_regs that is not
412# at the usual place
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413#
Martin Schwidefsky03ff9a22007-04-27 16:01:40 +0200414 .globl kernel_execve
415kernel_execve:
416 stm %r12,%r15,48(%r15)
417 lr %r14,%r15
418 l %r13,__LC_SVC_NEW_PSW+4
419 s %r15,BASED(.Lc_spsize)
420 st %r14,__SF_BACKCHAIN(%r15)
421 la %r12,SP_PTREGS(%r15)
422 xc 0(__PT_SIZE,%r12),0(%r12)
423 l %r1,BASED(.Ldo_execve)
424 lr %r5,%r12
425 basr %r14,%r1
426 ltr %r2,%r2
427 be BASED(0f)
428 a %r15,BASED(.Lc_spsize)
429 lm %r12,%r15,48(%r15)
430 br %r14
431 # execve succeeded.
4320: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts
433 l %r15,__LC_KERNEL_STACK # load ksp
434 s %r15,BASED(.Lc_spsize) # make room for registers & psw
435 l %r9,__LC_THREAD_INFO
436 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs
437 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
438 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
439 l %r1,BASED(.Lexecve_tail)
440 basr %r14,%r1
441 b BASED(sysc_return)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443/*
444 * Program check handler routine
445 */
446
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200447 .globl pgm_check_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448pgm_check_handler:
449/*
450 * First we need to check for a special case:
451 * Single stepping an instruction that disables the PER event mask will
452 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
453 * For a single stepped SVC the program check handler gets control after
454 * the SVC new PSW has been loaded. But we want to execute the SVC first and
455 * then handle the PER event. Therefore we update the SVC old PSW to point
456 * to the pgm_check_handler and branch to the SVC handler after we checked
457 * if we have to load the kernel stack register.
458 * For every other possible cause for PER event without the PER mask set
459 * we just ignore the PER event (FIXME: is there anything we have to do
460 * for LPSW?).
461 */
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100462 stpt __LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 SAVE_ALL_BASE __LC_SAVE_AREA
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200464 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
465 bnz BASED(pgm_per) # got per exception -> special case
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200466 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700467 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
469 bz BASED(pgm_no_vtime)
470 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
471 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
472 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
473pgm_no_vtime:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200475 l %r3,__LC_PGM_ILC # load program interruption code
Martin Schwidefsky1e546222010-10-25 16:10:37 +0200476 l %r4,__LC_TRANS_EXC_CODE
477 REENABLE_IRQS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 la %r8,0x7f
479 nr %r8,%r3
480pgm_do_call:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200481 l %r7,BASED(.Ljump_table)
482 sll %r8,2
483 l %r7,0(%r8,%r7) # load address of handler routine
484 la %r2,SP_PTREGS(%r15) # address of register-save area
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200485 basr %r14,%r7 # branch to interrupt-handler
486pgm_exit:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200487 b BASED(sysc_return)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489#
490# handle per exception
491#
492pgm_per:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200493 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on
494 bnz BASED(pgm_per_std) # ok, normal per event from user space
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495# ok its one of the special cases, now we need to find out which one
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200496 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW
497 be BASED(pgm_svcper)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498# no interesting special case, ignore PER event
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200499 lm %r12,%r15,__LC_SAVE_AREA
500 lpsw 0x28
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
502#
503# Normal per exception
504#
505pgm_per_std:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200506 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700507 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
509 bz BASED(pgm_no_vtime2)
510 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
511 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
512 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
513pgm_no_vtime2:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
515 l %r1,__TI_task(%r9)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200516 tm SP_PSW+1(%r15),0x01 # kernel per event ?
517 bz BASED(kernel_per)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
519 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
520 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
521 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200522 l %r3,__LC_PGM_ILC # load program interruption code
Martin Schwidefsky1e546222010-10-25 16:10:37 +0200523 l %r4,__LC_TRANS_EXC_CODE
524 REENABLE_IRQS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 la %r8,0x7f
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200526 nr %r8,%r3 # clear per-event-bit and ilc
Heiko Carstensf5cdac22010-07-27 19:29:37 +0200527 be BASED(pgm_exit2) # only per or per+check ?
528 l %r7,BASED(.Ljump_table)
529 sll %r8,2
530 l %r7,0(%r8,%r7) # load address of handler routine
531 la %r2,SP_PTREGS(%r15) # address of register-save area
532 basr %r14,%r7 # branch to interrupt-handler
533pgm_exit2:
Heiko Carstensf5cdac22010-07-27 19:29:37 +0200534 b BASED(sysc_return)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536#
537# it was a single stepped SVC that is causing all the trouble
538#
539pgm_svcper:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200540 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700541 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
543 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
544 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 lh %r7,0x8a # get svc number from lowcore
546 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Christian Borntraegerbcc65252009-11-13 15:43:54 +0100547 l %r8,__TI_task(%r9)
548 mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
549 mvc __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS
550 mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
552 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200553 lm %r2,%r6,SP_R2(%r15) # load svc arguments
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 b BASED(sysc_do_svc)
555
Michael Grundy4ba069b2006-09-20 15:58:39 +0200556#
557# per was called from kernel, must be kprobes
558#
559kernel_per:
Martin Schwidefsky9ec27082010-10-29 16:50:45 +0200560 REENABLE_IRQS
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100561 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check
562 mvi SP_SVCNR+1(%r15),0xff
Michael Grundy4ba069b2006-09-20 15:58:39 +0200563 la %r2,SP_PTREGS(%r15) # address of register-save area
564 l %r1,BASED(.Lhandle_per) # load adr. of per handler
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200565 basr %r14,%r1 # branch to do_single_step
566 b BASED(pgm_exit)
Michael Grundy4ba069b2006-09-20 15:58:39 +0200567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568/*
569 * IO interrupt handler routine
570 */
571
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200572 .globl io_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573io_int_handler:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 stck __LC_INT_CLOCK
Martin Schwidefsky9cfb9b32008-12-31 15:11:41 +0100575 stpt __LC_ASYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 SAVE_ALL_BASE __LC_SAVE_AREA+16
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200577 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
Heiko Carstens77fa2242005-06-25 14:55:30 -0700578 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
580 bz BASED(io_no_vtime)
581 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
582 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
583 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
584io_no_vtime:
Heiko Carstens1f194a42006-07-03 00:24:46 -0700585 TRACE_IRQS_OFF
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200586 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200587 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ
588 la %r2,SP_PTREGS(%r15) # address of register-save area
589 basr %r14,%r1 # branch to standard irq handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590io_return:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200591 LOCKDEP_SYS_EXIT
592 TRACE_IRQS_ON
593io_tif:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 tm __TI_flags+3(%r9),_TIF_WORK_INT
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200595 bnz BASED(io_work) # there is work to do (signals etc.)
Heiko Carstens411788e2007-11-20 11:13:32 +0100596io_restore:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200597 RESTORE_ALL __LC_RETURN_PSW,0
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700598io_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Martin Schwidefsky26889052008-05-07 09:22:52 +0200600#
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200601# There is work todo, find out in which context we have been interrupted:
602# 1) if we return to user space we can do all _TIF_WORK_INT work
603# 2) if we return to kernel code and preemptive scheduling is enabled check
604# the preemption counter and if it is zero call preempt_schedule_irq
605# Before any work can be done, a switch to the kernel stack is required.
Martin Schwidefsky26889052008-05-07 09:22:52 +0200606#
607io_work:
608 tm SP_PSW+1(%r15),0x01 # returning to user ?
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200609 bo BASED(io_work_user) # yes -> do resched & signal
610#ifdef CONFIG_PREEMPT
Martin Schwidefsky26889052008-05-07 09:22:52 +0200611 # check for preemptive scheduling
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 icm %r0,15,__TI_precount(%r9)
Martin Schwidefsky26889052008-05-07 09:22:52 +0200613 bnz BASED(io_restore) # preemption disabled
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200614 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
615 bno BASED(io_restore)
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200616 # switch to kernel stack
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 l %r1,SP_R15(%r15)
618 s %r1,BASED(.Lc_spsize)
619 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200620 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 lr %r15,%r1
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200622 # TRACE_IRQS_ON already done at io_return, call
623 # TRACE_IRQS_OFF to keep things symmetrical
624 TRACE_IRQS_OFF
Heiko Carstensb8e7a542007-11-20 11:13:35 +0100625 l %r1,BASED(.Lpreempt_schedule_irq)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200626 basr %r14,%r1 # call preempt_schedule_irq
627 b BASED(io_return)
628#else
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200629 b BASED(io_restore)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200630#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200632#
633# Need to do work before returning to userspace, switch to kernel stack
634#
Martin Schwidefsky26889052008-05-07 09:22:52 +0200635io_work_user:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 l %r1,__LC_KERNEL_STACK
637 s %r1,BASED(.Lc_spsize)
638 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200639 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 lr %r15,%r1
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200641
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642#
643# One of the work bits is on. Find out which one.
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200644# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200645# and _TIF_MCCK_PENDING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646#
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200647io_work_tif:
Heiko Carstens77fa2242005-06-25 14:55:30 -0700648 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200649 bo BASED(io_mcck_pending)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
651 bo BASED(io_reschedule)
Roland McGrath02a029b2008-04-30 00:53:08 -0700652 tm __TI_flags+3(%r9),_TIF_SIGPENDING
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200653 bo BASED(io_sigpending)
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200654 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
Martin Schwidefsky43d399d2010-05-17 10:00:01 +0200655 bo BASED(io_notify_resume)
656 b BASED(io_return) # beware of critical section cleanup
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
658#
Heiko Carstens77fa2242005-06-25 14:55:30 -0700659# _TIF_MCCK_PENDING is set, call handler
660#
661io_mcck_pending:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200662 # TRACE_IRQS_ON already done at io_return
Heiko Carstens77fa2242005-06-25 14:55:30 -0700663 l %r1,BASED(.Ls390_handle_mcck)
Heiko Carstensb771aea2007-07-27 12:29:18 +0200664 basr %r14,%r1 # TIF bit will be cleared by handler
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200665 TRACE_IRQS_OFF
666 b BASED(io_return)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700667
668#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200670#
671io_reschedule:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200672 # TRACE_IRQS_ON already done at io_return
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200673 l %r1,BASED(.Lschedule)
674 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
675 basr %r14,%r1 # call scheduler
676 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
Heiko Carstens411788e2007-11-20 11:13:32 +0100677 TRACE_IRQS_OFF
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200678 b BASED(io_return)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
680#
Roland McGrath02a029b2008-04-30 00:53:08 -0700681# _TIF_SIGPENDING is set, call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682#
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200683io_sigpending:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200684 # TRACE_IRQS_ON already done at io_return
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200685 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
686 la %r2,SP_PTREGS(%r15) # load pt_regs
687 l %r1,BASED(.Ldo_signal)
688 basr %r14,%r1 # call do_signal
689 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
Heiko Carstens411788e2007-11-20 11:13:32 +0100690 TRACE_IRQS_OFF
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200691 b BASED(io_return)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200693#
694# _TIF_SIGPENDING is set, call do_signal
695#
696io_notify_resume:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200697 # TRACE_IRQS_ON already done at io_return
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200698 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
699 la %r2,SP_PTREGS(%r15) # load pt_regs
700 l %r1,BASED(.Ldo_notify_resume)
701 basr %r14,%r1 # call do_signal
702 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
703 TRACE_IRQS_OFF
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200704 b BASED(io_return)
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +0200705
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706/*
707 * External interrupt handler routine
708 */
709
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200710 .globl ext_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711ext_int_handler:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 stck __LC_INT_CLOCK
Martin Schwidefsky9cfb9b32008-12-31 15:11:41 +0100713 stpt __LC_ASYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 SAVE_ALL_BASE __LC_SAVE_AREA+16
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200715 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
Heiko Carstens77fa2242005-06-25 14:55:30 -0700716 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
718 bz BASED(ext_no_vtime)
719 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
720 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
721 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
722ext_no_vtime:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens1f194a42006-07-03 00:24:46 -0700724 TRACE_IRQS_OFF
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200725 la %r2,SP_PTREGS(%r15) # address of register-save area
Martin Schwidefskyf6649a72010-10-25 16:10:38 +0200726 l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code
727 l %r4,__LC_EXT_PARAMS # get external parameters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 l %r1,BASED(.Ldo_extint)
729 basr %r14,%r1
730 b BASED(io_return)
731
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700732__critical_end:
733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734/*
735 * Machine check handler routines
736 */
737
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200738 .globl mcck_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739mcck_int_handler:
Martin Schwidefsky63779812010-05-17 10:00:03 +0200740 stck __LC_MCCK_CLOCK
Heiko Carstens77fa2242005-06-25 14:55:30 -0700741 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer
742 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 SAVE_ALL_BASE __LC_SAVE_AREA+32
Heiko Carstens77fa2242005-06-25 14:55:30 -0700744 la %r12,__LC_MCK_OLD_PSW
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200745 tm __LC_MCCK_CODE,0x80 # system damage?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700746 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid
Martin Schwidefsky63779812010-05-17 10:00:03 +0200747 mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200748 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
749 bo BASED(1f)
750 la %r14,__LC_SYNC_ENTER_TIMER
751 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
752 bl BASED(0f)
753 la %r14,__LC_ASYNC_ENTER_TIMER
7540: clc 0(8,%r14),__LC_EXIT_TIMER
755 bl BASED(0f)
756 la %r14,__LC_EXIT_TIMER
7570: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
758 bl BASED(0f)
759 la %r14,__LC_LAST_UPDATE_TIMER
7600: spt 0(%r14)
Martin Schwidefsky63779812010-05-17 10:00:03 +0200761 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
Martin Schwidefskyc185b782008-12-25 13:39:25 +01007621: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700763 bno BASED(mcck_int_main) # no -> skip cleanup critical
764 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
765 bnz BASED(mcck_int_main) # from user -> load async stack
766 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end)
767 bhe BASED(mcck_int_main)
768 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start)
769 bl BASED(mcck_int_main)
770 l %r14,BASED(.Lcleanup_critical)
771 basr %r14,%r14
772mcck_int_main:
773 l %r14,__LC_PANIC_STACK # are we already on the panic stack?
774 slr %r14,%r15
775 sra %r14,PAGE_SHIFT
776 be BASED(0f)
777 l %r15,__LC_PANIC_STACK # load panic stack
7780: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200779 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700780 bno BASED(mcck_no_vtime) # no -> skip cleanup critical
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200781 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700782 bz BASED(mcck_no_vtime)
Martin Schwidefsky63779812010-05-17 10:00:03 +0200783 UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700784 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
Martin Schwidefsky63779812010-05-17 10:00:03 +0200785 mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700786mcck_no_vtime:
Heiko Carstens77fa2242005-06-25 14:55:30 -0700787 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
788 la %r2,SP_PTREGS(%r15) # load pt_regs
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200789 l %r1,BASED(.Ls390_mcck)
790 basr %r14,%r1 # call machine check handler
791 tm SP_PSW+1(%r15),0x01 # returning to user ?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700792 bno BASED(mcck_return)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200793 l %r1,__LC_KERNEL_STACK # switch to kernel stack
Heiko Carstens77fa2242005-06-25 14:55:30 -0700794 s %r1,BASED(.Lc_spsize)
795 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200796 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Heiko Carstens77fa2242005-06-25 14:55:30 -0700797 lr %r15,%r1
798 stosm __SF_EMPTY(%r15),0x04 # turn dat on
799 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
800 bno BASED(mcck_return)
Heiko Carstens1f194a42006-07-03 00:24:46 -0700801 TRACE_IRQS_OFF
Heiko Carstens77fa2242005-06-25 14:55:30 -0700802 l %r1,BASED(.Ls390_handle_mcck)
803 basr %r14,%r1 # call machine check handler
Heiko Carstens1f194a42006-07-03 00:24:46 -0700804 TRACE_IRQS_ON
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805mcck_return:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200806 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW
807 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200808 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
809 bno BASED(0f)
810 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
811 stpt __LC_EXIT_TIMER
812 lpsw __LC_RETURN_MCCK_PSW # back to caller
Martin Schwidefskyc185b782008-12-25 13:39:25 +01008130: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200814 lpsw __LC_RETURN_MCCK_PSW # back to caller
815
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200816 RESTORE_ALL __LC_RETURN_MCCK_PSW,0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818/*
819 * Restart interruption handler, kick starter for additional CPUs
820 */
Heiko Carstens84b36a82007-06-19 13:10:03 +0200821#ifdef CONFIG_SMP
Heiko Carstens2bc89b52008-02-05 16:50:40 +0100822 __CPUINIT
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200823 .globl restart_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824restart_int_handler:
Martin Schwidefsky5b409ed2009-04-14 15:36:27 +0200825 basr %r1,0
826restart_base:
827 spt restart_vtime-restart_base(%r1)
828 stck __LC_LAST_UPDATE_CLOCK
829 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
830 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200831 l %r15,__LC_SAVE_AREA+60 # load ksp
832 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
833 lam %a0,%a15,__LC_AREGS_SAVE_AREA
834 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone
Martin Schwidefsky5b409ed2009-04-14 15:36:27 +0200835 l %r1,__LC_THREAD_INFO
836 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1)
837 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
838 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200839 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on
840 basr %r14,0
841 l %r14,restart_addr-.(%r14)
842 br %r14 # branch to start_secondary
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843restart_addr:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200844 .long start_secondary
Martin Schwidefsky5b409ed2009-04-14 15:36:27 +0200845 .align 8
846restart_vtime:
847 .long 0x7fffffff,0xffffffff
Heiko Carstens84b36a82007-06-19 13:10:03 +0200848 .previous
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849#else
850/*
851 * If we do not run with SMP enabled, let the new CPU crash ...
852 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200853 .globl restart_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854restart_int_handler:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200855 basr %r1,0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856restart_base:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200857 lpsw restart_crash-restart_base(%r1)
858 .align 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859restart_crash:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200860 .long 0x000a0000,0x00000000
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861restart_go:
862#endif
863
864#ifdef CONFIG_CHECK_STACK
865/*
866 * The synchronous or the asynchronous stack overflowed. We are dead.
867 * No need to properly save the registers, we are going to panic anyway.
868 * Setup a pt_regs so that show_trace can provide a good call trace.
869 */
870stack_overflow:
871 l %r15,__LC_PANIC_STACK # change to panic stack
872 sl %r15,BASED(.Lc_spsize)
873 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
874 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
875 la %r1,__LC_SAVE_AREA
876 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ?
877 be BASED(0f)
878 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ?
879 be BASED(0f)
880 la %r1,__LC_SAVE_AREA+16
8810: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200882 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 l %r1,BASED(1f) # branch to kernel_stack_overflow
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200884 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 br %r1
Heiko Carstens25d83cb2006-09-28 16:56:37 +02008861: .long kernel_stack_overflow
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887#endif
888
889cleanup_table_system_call:
890 .long system_call + 0x80000000, sysc_do_svc + 0x80000000
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200891cleanup_table_sysc_tif:
892 .long sysc_tif + 0x80000000, sysc_restore + 0x80000000
893cleanup_table_sysc_restore:
894 .long sysc_restore + 0x80000000, sysc_done + 0x80000000
895cleanup_table_io_tif:
896 .long io_tif + 0x80000000, io_restore + 0x80000000
897cleanup_table_io_restore:
898 .long io_restore + 0x80000000, io_done + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
900cleanup_critical:
901 clc 4(4,%r12),BASED(cleanup_table_system_call)
902 bl BASED(0f)
903 clc 4(4,%r12),BASED(cleanup_table_system_call+4)
904 bl BASED(cleanup_system_call)
9050:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200906 clc 4(4,%r12),BASED(cleanup_table_sysc_tif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 bl BASED(0f)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200908 clc 4(4,%r12),BASED(cleanup_table_sysc_tif+4)
909 bl BASED(cleanup_sysc_tif)
Linus Torvalds1da177e2005-04-16 15:20:36 -07009100:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200911 clc 4(4,%r12),BASED(cleanup_table_sysc_restore)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 bl BASED(0f)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200913 clc 4(4,%r12),BASED(cleanup_table_sysc_restore+4)
914 bl BASED(cleanup_sysc_restore)
Linus Torvalds1da177e2005-04-16 15:20:36 -07009150:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200916 clc 4(4,%r12),BASED(cleanup_table_io_tif)
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200917 bl BASED(0f)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200918 clc 4(4,%r12),BASED(cleanup_table_io_tif+4)
919 bl BASED(cleanup_io_tif)
Martin Schwidefsky63b12242006-06-29 14:58:05 +02009200:
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200921 clc 4(4,%r12),BASED(cleanup_table_io_restore)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700922 bl BASED(0f)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200923 clc 4(4,%r12),BASED(cleanup_table_io_restore+4)
924 bl BASED(cleanup_io_restore)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07009250:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 br %r14
927
928cleanup_system_call:
929 mvc __LC_RETURN_PSW(8),0(%r12)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
931 bh BASED(0f)
Martin Schwidefsky63779812010-05-17 10:00:03 +0200932 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
933 c %r12,BASED(.Lmck_old_psw)
934 be BASED(0f)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
Martin Schwidefsky63779812010-05-17 10:00:03 +02009360: c %r12,BASED(.Lmck_old_psw)
937 la %r12,__LC_SAVE_AREA+32
938 be BASED(0f)
939 la %r12,__LC_SAVE_AREA+16
Linus Torvalds1da177e2005-04-16 15:20:36 -07009400: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8)
941 bhe BASED(cleanup_vtime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
943 bh BASED(0f)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700944 mvc __LC_SAVE_AREA(16),0(%r12)
9450: st %r13,4(%r12)
946 st %r12,__LC_SAVE_AREA+48 # argh
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200947 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700948 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700949 l %r12,__LC_SAVE_AREA+48 # argh
950 st %r15,12(%r12)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 lh %r7,0x8a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952cleanup_vtime:
953 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
954 bhe BASED(cleanup_stime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
956cleanup_stime:
957 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16)
958 bh BASED(cleanup_update)
959 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
960cleanup_update:
961 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4)
963 la %r12,__LC_RETURN_PSW
964 br %r14
965cleanup_system_call_insn:
966 .long sysc_saveall + 0x80000000
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200967 .long system_call + 0x80000000
968 .long sysc_vtime + 0x80000000
969 .long sysc_stime + 0x80000000
970 .long sysc_update + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200972cleanup_sysc_tif:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 mvc __LC_RETURN_PSW(4),0(%r12)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200974 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 la %r12,__LC_RETURN_PSW
976 br %r14
977
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200978cleanup_sysc_restore:
979 clc 4(4,%r12),BASED(cleanup_sysc_restore_insn)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700980 be BASED(2f)
Martin Schwidefsky63779812010-05-17 10:00:03 +0200981 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
982 c %r12,BASED(.Lmck_old_psw)
983 be BASED(0f)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
Martin Schwidefsky63779812010-05-17 10:00:03 +02009850: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700986 be BASED(2f)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700988 c %r12,BASED(.Lmck_old_psw)
Martin Schwidefsky63779812010-05-17 10:00:03 +0200989 la %r12,__LC_SAVE_AREA+32
990 be BASED(1f)
991 la %r12,__LC_SAVE_AREA+16
9921: mvc 0(16,%r12),SP_R12(%r15)
993 lm %r0,%r11,SP_R0(%r15)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 l %r15,SP_R15(%r15)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07009952: la %r12,__LC_RETURN_PSW
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 br %r14
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +0200997cleanup_sysc_restore_insn:
Heiko Carstens411788e2007-11-20 11:13:32 +0100998 .long sysc_done - 4 + 0x80000000
Heiko Carstens411788e2007-11-20 11:13:32 +0100999 .long sysc_done - 8 + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +02001001cleanup_io_tif:
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001002 mvc __LC_RETURN_PSW(4),0(%r12)
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +02001003 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif)
Martin Schwidefsky176b1802010-04-09 13:43:00 +02001004 la %r12,__LC_RETURN_PSW
1005 br %r14
1006
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +02001007cleanup_io_restore:
1008 clc 4(4,%r12),BASED(cleanup_io_restore_insn)
Martin Schwidefsky63779812010-05-17 10:00:03 +02001009 be BASED(1f)
1010 mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +02001011 clc 4(4,%r12),BASED(cleanup_io_restore_insn+4)
Martin Schwidefsky63779812010-05-17 10:00:03 +02001012 be BASED(1f)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001013 mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001014 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15)
Martin Schwidefsky63779812010-05-17 10:00:03 +02001015 lm %r0,%r11,SP_R0(%r15)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001016 l %r15,SP_R15(%r15)
Martin Schwidefsky63779812010-05-17 10:00:03 +020010171: la %r12,__LC_RETURN_PSW
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001018 br %r14
Martin Schwidefsky6a2df3a2010-05-17 10:00:02 +02001019cleanup_io_restore_insn:
Heiko Carstens411788e2007-11-20 11:13:32 +01001020 .long io_done - 4 + 0x80000000
Heiko Carstens411788e2007-11-20 11:13:32 +01001021 .long io_done - 8 + 0x80000000
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001022
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023/*
1024 * Integer constants
1025 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001026 .align 4
1027.Lc_spsize: .long SP_SIZE
1028.Lc_overhead: .long STACK_FRAME_OVERHEAD
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001029.Lnr_syscalls: .long NR_syscalls
1030.L0x018: .short 0x018
1031.L0x020: .short 0x020
1032.L0x028: .short 0x028
1033.L0x030: .short 0x030
1034.L0x038: .short 0x038
1035.Lc_1: .long 1
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
1037/*
1038 * Symbol constants
1039 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001040.Ls390_mcck: .long s390_do_machine_check
Heiko Carstens77fa2242005-06-25 14:55:30 -07001041.Ls390_handle_mcck:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001042 .long s390_handle_mcck
1043.Lmck_old_psw: .long __LC_MCK_OLD_PSW
1044.Ldo_IRQ: .long do_IRQ
1045.Ldo_extint: .long do_extint
1046.Ldo_signal: .long do_signal
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +02001047.Ldo_notify_resume:
1048 .long do_notify_resume
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001049.Lhandle_per: .long do_single_step
Martin Schwidefsky03ff9a22007-04-27 16:01:40 +02001050.Ldo_execve: .long do_execve
1051.Lexecve_tail: .long execve_tail
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001052.Ljump_table: .long pgm_check_table
1053.Lschedule: .long schedule
Christian Borntraegerab1809b2007-12-04 16:09:04 +01001054#ifdef CONFIG_PREEMPT
Heiko Carstensb8e7a542007-11-20 11:13:35 +01001055.Lpreempt_schedule_irq:
1056 .long preempt_schedule_irq
Christian Borntraegerab1809b2007-12-04 16:09:04 +01001057#endif
Martin Schwidefsky753c4dd62008-10-10 21:33:20 +02001058.Ltrace_entry: .long do_syscall_trace_enter
1059.Ltrace_exit: .long do_syscall_trace_exit
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001060.Lschedtail: .long schedule_tail
1061.Lsysc_table: .long sys_call_table
Heiko Carstens1f194a42006-07-03 00:24:46 -07001062#ifdef CONFIG_TRACE_IRQFLAGS
Heiko Carstens50bec4c2008-11-14 18:18:05 +01001063.Ltrace_irq_on_caller:
1064 .long trace_hardirqs_on_caller
1065.Ltrace_irq_off_caller:
1066 .long trace_hardirqs_off_caller
Heiko Carstensaf4c68742008-11-14 18:18:03 +01001067#endif
1068#ifdef CONFIG_LOCKDEP
Heiko Carstens523b44c2007-10-11 22:11:12 +02001069.Llockdep_sys_exit:
1070 .long lockdep_sys_exit
Heiko Carstens1f194a42006-07-03 00:24:46 -07001071#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072.Lcritical_start:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001073 .long __critical_start + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074.Lcritical_end:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001075 .long __critical_end + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076.Lcleanup_critical:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001077 .long cleanup_critical
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001079 .section .rodata, "a"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080#define SYSCALL(esa,esame,emu) .long esa
Heiko Carstens9bf12262009-06-12 10:26:47 +02001081 .globl sys_call_table
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082sys_call_table:
1083#include "syscalls.S"
1084#undef SYSCALL