blob: c4c80a22bc1f315215111d240a8756b479e2fe37 [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 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 + 4
33SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
34SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12
35SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
36SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20
37SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
38SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28
39SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
40SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36
41SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
42SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44
43SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
44SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52
45SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
46SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60
47SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
48SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC
Martin Schwidefsky59da2132008-11-27 11:05:55 +010049SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR
Heiko Carstens25d83cb2006-09-28 16:56:37 +020050SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +020052_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -080053 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +020054_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -080055 _TIF_MCCK_PENDING)
Heiko Carstens9bf12262009-06-12 10:26:47 +020056_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
57 _TIF_SECCOMP>>8 | _TIF_SYSCALL_FTRACE>>8)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
60STACK_SIZE = 1 << STACK_SHIFT
61
62#define BASED(name) name-system_call(%r13)
63
Heiko Carstens1f194a42006-07-03 00:24:46 -070064#ifdef CONFIG_TRACE_IRQFLAGS
65 .macro TRACE_IRQS_ON
Heiko Carstens50bec4c2008-11-14 18:18:05 +010066 basr %r2,%r0
67 l %r1,BASED(.Ltrace_irq_on_caller)
Heiko Carstens1f194a42006-07-03 00:24:46 -070068 basr %r14,%r1
69 .endm
70
71 .macro TRACE_IRQS_OFF
Heiko Carstens50bec4c2008-11-14 18:18:05 +010072 basr %r2,%r0
73 l %r1,BASED(.Ltrace_irq_off_caller)
Heiko Carstens1f194a42006-07-03 00:24:46 -070074 basr %r14,%r1
75 .endm
Heiko Carstens523b44c2007-10-11 22:11:12 +020076
Heiko Carstens411788e2007-11-20 11:13:32 +010077 .macro TRACE_IRQS_CHECK
Heiko Carstens50bec4c2008-11-14 18:18:05 +010078 basr %r2,%r0
Heiko Carstens411788e2007-11-20 11:13:32 +010079 tm SP_PSW(%r15),0x03 # irqs enabled?
80 jz 0f
Heiko Carstens50bec4c2008-11-14 18:18:05 +010081 l %r1,BASED(.Ltrace_irq_on_caller)
Heiko Carstens523b44c2007-10-11 22:11:12 +020082 basr %r14,%r1
Heiko Carstens411788e2007-11-20 11:13:32 +010083 j 1f
Heiko Carstens50bec4c2008-11-14 18:18:05 +0100840: l %r1,BASED(.Ltrace_irq_off_caller)
Heiko Carstens411788e2007-11-20 11:13:32 +010085 basr %r14,%r1
861:
Heiko Carstens523b44c2007-10-11 22:11:12 +020087 .endm
Heiko Carstens1f194a42006-07-03 00:24:46 -070088#else
89#define TRACE_IRQS_ON
90#define TRACE_IRQS_OFF
Heiko Carstens411788e2007-11-20 11:13:32 +010091#define TRACE_IRQS_CHECK
92#endif
93
94#ifdef CONFIG_LOCKDEP
95 .macro LOCKDEP_SYS_EXIT
96 tm SP_PSW+1(%r15),0x01 # returning to user ?
97 jz 0f
98 l %r1,BASED(.Llockdep_sys_exit)
99 basr %r14,%r1
1000:
101 .endm
102#else
Heiko Carstens523b44c2007-10-11 22:11:12 +0200103#define LOCKDEP_SYS_EXIT
Heiko Carstens1f194a42006-07-03 00:24:46 -0700104#endif
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106/*
107 * Register usage in interrupt handlers:
108 * R9 - pointer to current task structure
109 * R13 - pointer to literal pool
110 * R14 - return register for function calls
111 * R15 - kernel stack pointer
112 */
113
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200114 .macro UPDATE_VTIME lc_from,lc_to,lc_sum
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 lm %r10,%r11,\lc_from
116 sl %r10,\lc_to
117 sl %r11,\lc_to+4
118 bc 3,BASED(0f)
119 sl %r10,BASED(.Lc_1)
1200: al %r10,\lc_sum
121 al %r11,\lc_sum+4
122 bc 12,BASED(1f)
123 al %r10,BASED(.Lc_1)
1241: stm %r10,%r11,\lc_sum
125 .endm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
127 .macro SAVE_ALL_BASE savearea
128 stm %r12,%r15,\savearea
129 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
130 .endm
131
Martin Schwidefsky987ad702007-07-10 11:24:18 +0200132 .macro SAVE_ALL_SVC psworg,savearea
133 la %r12,\psworg
134 l %r15,__LC_KERNEL_STACK # problem state -> load ksp
135 .endm
136
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200137 .macro SAVE_ALL_SYNC psworg,savearea
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 la %r12,\psworg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 tm \psworg+1,0x01 # test problem state bit
140 bz BASED(2f) # skip stack setup save
141 l %r15,__LC_KERNEL_STACK # problem state -> load ksp
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200142#ifdef CONFIG_CHECK_STACK
143 b BASED(3f)
1442: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
145 bz BASED(stack_overflow)
1463:
147#endif
1482:
149 .endm
150
151 .macro SAVE_ALL_ASYNC psworg,savearea
152 la %r12,\psworg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 tm \psworg+1,0x01 # test problem state bit
154 bnz BASED(1f) # from user -> load async stack
155 clc \psworg+4(4),BASED(.Lcritical_end)
156 bhe BASED(0f)
157 clc \psworg+4(4),BASED(.Lcritical_start)
158 bl BASED(0f)
159 l %r14,BASED(.Lcleanup_critical)
160 basr %r14,%r14
Peter Oberparleiter6add9f72005-09-16 19:27:42 -0700161 tm 1(%r12),0x01 # retest problem state after cleanup
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 bnz BASED(1f)
1630: l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
164 slr %r14,%r15
165 sra %r14,STACK_SHIFT
166 be BASED(2f)
1671: l %r15,__LC_ASYNC_STACK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168#ifdef CONFIG_CHECK_STACK
169 b BASED(3f)
1702: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
171 bz BASED(stack_overflow)
1723:
173#endif
Heiko Carstens77fa2242005-06-25 14:55:30 -07001742:
175 .endm
176
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200177 .macro CREATE_STACK_FRAME psworg,savearea
Heiko Carstens77fa2242005-06-25 14:55:30 -0700178 s %r15,BASED(.Lc_spsize) # make room for registers & psw
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100181 icm %r12,3,__LC_SVC_ILC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100183 st %r12,SP_SVCNR(%r15)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack
185 la %r12,0
186 st %r12,__SF_BACKCHAIN(%r15) # clear back chain
187 .endm
188
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200189 .macro RESTORE_ALL psworg,sync
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700190 mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 .if !\sync
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700192 ni \psworg+1,0xfd # clear wait state bit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 .endif
194 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100195 stpt __LC_EXIT_TIMER
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700196 lpsw \psworg # back to caller
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 .endm
198
199/*
200 * Scheduler resume function, called by switch_to
201 * gpr2 = (task_struct *) prev
202 * gpr3 = (task_struct *) next
203 * Returns:
204 * gpr2 = prev
205 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200206 .globl __switch_to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207__switch_to:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200208 basr %r1,0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209__switch_to_base:
210 tm __THREAD_per(%r3),0xe8 # new process is using per ?
211 bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200212 stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff
213 clc __THREAD_per(12,%r3),__SF_EMPTY(%r15)
214 be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's
215 lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216__switch_to_noper:
Heiko Carstens77fa2242005-06-25 14:55:30 -0700217 l %r4,__THREAD_info(%r2) # get thread_info of prev
218 tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
219 bz __switch_to_no_mcck-__switch_to_base(%r1)
220 ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
221 l %r4,__THREAD_info(%r3) # get thread_info of next
222 oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
223__switch_to_no_mcck:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200224 stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
226 l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
227 lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
228 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct
229 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200230 l %r3,__THREAD_info(%r3) # load thread_info from task struct
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 st %r3,__LC_THREAD_INFO
232 ahi %r3,STACK_SIZE
233 st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
234 br %r14
235
236__critical_start:
237/*
238 * SVC interrupt handler routine. System calls are synchronous events and
239 * are executed with interrupts enabled.
240 */
241
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200242 .globl system_call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243system_call:
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100244 stpt __LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245sysc_saveall:
246 SAVE_ALL_BASE __LC_SAVE_AREA
Martin Schwidefsky987ad702007-07-10 11:24:18 +0200247 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700248 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 lh %r7,0x8a # get svc number from lowcore
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250sysc_vtime:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
252sysc_stime:
253 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
254sysc_update:
255 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256sysc_do_svc:
257 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100258 ltr %r7,%r7 # test for svc 0
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200259 bnz BASED(sysc_nr_ok) # svc number > 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 # svc 0: system call number in %r1
261 cl %r1,BASED(.Lnr_syscalls)
262 bnl BASED(sysc_nr_ok)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200263 lr %r7,%r1 # copy svc number to %r7
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264sysc_nr_ok:
265 mvc SP_ARGS(4,%r15),SP_R7(%r15)
266sysc_do_restart:
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100267 sth %r7,SP_SVCNR(%r15)
268 sll %r7,2 # svc number *4
Heiko Carstensd882b172006-07-01 04:36:31 -0700269 l %r8,BASED(.Lsysc_table)
Heiko Carstensbcf5cef2009-06-12 10:26:26 +0200270 tm __TI_flags+2(%r9),_TIF_SYSCALL
Heiko Carstensd882b172006-07-01 04:36:31 -0700271 l %r8,0(%r7,%r8) # get system call addr.
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200272 bnz BASED(sysc_tracesys)
273 basr %r14,%r8 # call sys_xxxx
274 st %r2,SP_R2(%r15) # store return value (change R2 on stack)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
276sysc_return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 tm __TI_flags+3(%r9),_TIF_WORK_SVC
278 bnz BASED(sysc_work) # there is work to do (signals etc.)
Heiko Carstens411788e2007-11-20 11:13:32 +0100279sysc_restore:
280#ifdef CONFIG_TRACE_IRQFLAGS
281 la %r1,BASED(sysc_restore_trace_psw)
282 lpsw 0(%r1)
283sysc_restore_trace:
284 TRACE_IRQS_CHECK
Heiko Carstens523b44c2007-10-11 22:11:12 +0200285 LOCKDEP_SYS_EXIT
Heiko Carstens411788e2007-11-20 11:13:32 +0100286#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287sysc_leave:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200288 RESTORE_ALL __LC_RETURN_PSW,1
Heiko Carstens411788e2007-11-20 11:13:32 +0100289sysc_done:
290
291#ifdef CONFIG_TRACE_IRQFLAGS
292 .align 8
293 .globl sysc_restore_trace_psw
294sysc_restore_trace_psw:
295 .long 0, sysc_restore_trace + 0x80000000
296#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
298#
299# recheck if there is more work to do
300#
301sysc_work_loop:
302 tm __TI_flags+3(%r9),_TIF_WORK_SVC
Heiko Carstens411788e2007-11-20 11:13:32 +0100303 bz BASED(sysc_restore) # there is no work to do
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304#
305# One of the work bits is on. Find out which one.
306#
307sysc_work:
Martin Schwidefsky26889052008-05-07 09:22:52 +0200308 tm SP_PSW+1(%r15),0x01 # returning to user ?
309 bno BASED(sysc_restore)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700310 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
311 bo BASED(sysc_mcck_pending)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
313 bo BASED(sysc_reschedule)
Roland McGrath02a029b2008-04-30 00:53:08 -0700314 tm __TI_flags+3(%r9),_TIF_SIGPENDING
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -0800315 bnz BASED(sysc_sigpending)
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200316 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
317 bnz BASED(sysc_notify_resume)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 tm __TI_flags+3(%r9),_TIF_RESTART_SVC
319 bo BASED(sysc_restart)
320 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
321 bo BASED(sysc_singlestep)
Heiko Carstens411788e2007-11-20 11:13:32 +0100322 b BASED(sysc_restore)
323sysc_work_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325#
326# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200327#
328sysc_reschedule:
329 l %r1,BASED(.Lschedule)
330 la %r14,BASED(sysc_work_loop)
331 br %r1 # call scheduler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333#
Heiko Carstens77fa2242005-06-25 14:55:30 -0700334# _TIF_MCCK_PENDING is set, call handler
335#
336sysc_mcck_pending:
337 l %r1,BASED(.Ls390_handle_mcck)
338 la %r14,BASED(sysc_work_loop)
339 br %r1 # TIF bit will be cleared by handler
340
341#
Roland McGrath02a029b2008-04-30 00:53:08 -0700342# _TIF_SIGPENDING is set, call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343#
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200344sysc_sigpending:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200346 la %r2,SP_PTREGS(%r15) # load pt_regs
347 l %r1,BASED(.Ldo_signal)
348 basr %r14,%r1 # call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 tm __TI_flags+3(%r9),_TIF_RESTART_SVC
350 bo BASED(sysc_restart)
351 tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
352 bo BASED(sysc_singlestep)
Heiko Carstense1c3ad92005-11-07 00:59:02 -0800353 b BASED(sysc_work_loop)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355#
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200356# _TIF_NOTIFY_RESUME is set, call do_notify_resume
357#
358sysc_notify_resume:
359 la %r2,SP_PTREGS(%r15) # load pt_regs
360 l %r1,BASED(.Ldo_notify_resume)
361 la %r14,BASED(sysc_work_loop)
362 br %r1 # call do_notify_resume
363
364
365#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366# _TIF_RESTART_SVC is set, set up registers and restart svc
367#
368sysc_restart:
369 ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200370 l %r7,SP_R2(%r15) # load new svc number
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200372 lm %r2,%r6,SP_R2(%r15) # load svc arguments
373 b BASED(sysc_do_restart) # restart svc
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
375#
376# _TIF_SINGLE_STEP is set, call do_single_step
377#
378sysc_singlestep:
379 ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100380 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check
381 mvi SP_SVCNR+1(%r15),0xff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 la %r2,SP_PTREGS(%r15) # address of register-save area
383 l %r1,BASED(.Lhandle_per) # load adr. of per handler
384 la %r14,BASED(sysc_return) # load adr. of system return
385 br %r1 # branch to do_single_step
386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387#
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200388# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
389# and after the system call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390#
391sysc_tracesys:
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200392 l %r1,BASED(.Ltrace_entry)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200393 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 la %r3,0
395 srl %r7,2
396 st %r7,SP_R2(%r15)
397 basr %r14,%r1
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200398 cl %r2,BASED(.Lnr_syscalls)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 bnl BASED(sysc_tracenogo)
Heiko Carstensd882b172006-07-01 04:36:31 -0700400 l %r8,BASED(.Lsysc_table)
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200401 lr %r7,%r2
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100402 sll %r7,2 # svc number *4
Heiko Carstensd882b172006-07-01 04:36:31 -0700403 l %r8,0(%r7,%r8)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404sysc_tracego:
405 lm %r3,%r6,SP_R3(%r15)
406 l %r2,SP_ORIG_R2(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200407 basr %r14,%r8 # call sys_xxx
408 st %r2,SP_R2(%r15) # store return value
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409sysc_tracenogo:
Heiko Carstensbcf5cef2009-06-12 10:26:26 +0200410 tm __TI_flags+2(%r9),_TIF_SYSCALL
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200411 bz BASED(sysc_return)
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200412 l %r1,BASED(.Ltrace_exit)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200413 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 la %r14,BASED(sysc_return)
415 br %r1
416
417#
418# a new process exits the kernel with ret_from_fork
419#
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200420 .globl ret_from_fork
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421ret_from_fork:
422 l %r13,__LC_SVC_NEW_PSW+4
423 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
424 tm SP_PSW+1(%r15),0x01 # forking a kernel thread ?
425 bo BASED(0f)
426 st %r15,SP_R15(%r15) # store stack pointer for new kthread
Heiko Carstens25d83cb2006-09-28 16:56:37 +02004270: l %r1,BASED(.Lschedtail)
428 basr %r14,%r1
Heiko Carstens1f194a42006-07-03 00:24:46 -0700429 TRACE_IRQS_ON
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200430 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
Al Viro8f2961c2008-12-25 13:37:58 +0100431 b BASED(sysc_tracenogo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433#
Martin Schwidefsky03ff9a22007-04-27 16:01:40 +0200434# kernel_execve function needs to deal with pt_regs that is not
435# at the usual place
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436#
Martin Schwidefsky03ff9a22007-04-27 16:01:40 +0200437 .globl kernel_execve
438kernel_execve:
439 stm %r12,%r15,48(%r15)
440 lr %r14,%r15
441 l %r13,__LC_SVC_NEW_PSW+4
442 s %r15,BASED(.Lc_spsize)
443 st %r14,__SF_BACKCHAIN(%r15)
444 la %r12,SP_PTREGS(%r15)
445 xc 0(__PT_SIZE,%r12),0(%r12)
446 l %r1,BASED(.Ldo_execve)
447 lr %r5,%r12
448 basr %r14,%r1
449 ltr %r2,%r2
450 be BASED(0f)
451 a %r15,BASED(.Lc_spsize)
452 lm %r12,%r15,48(%r15)
453 br %r14
454 # execve succeeded.
4550: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts
456 l %r15,__LC_KERNEL_STACK # load ksp
457 s %r15,BASED(.Lc_spsize) # make room for registers & psw
458 l %r9,__LC_THREAD_INFO
459 mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs
460 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
461 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
462 l %r1,BASED(.Lexecve_tail)
463 basr %r14,%r1
464 b BASED(sysc_return)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
466/*
467 * Program check handler routine
468 */
469
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200470 .globl pgm_check_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471pgm_check_handler:
472/*
473 * First we need to check for a special case:
474 * Single stepping an instruction that disables the PER event mask will
475 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
476 * For a single stepped SVC the program check handler gets control after
477 * the SVC new PSW has been loaded. But we want to execute the SVC first and
478 * then handle the PER event. Therefore we update the SVC old PSW to point
479 * to the pgm_check_handler and branch to the SVC handler after we checked
480 * if we have to load the kernel stack register.
481 * For every other possible cause for PER event without the PER mask set
482 * we just ignore the PER event (FIXME: is there anything we have to do
483 * for LPSW?).
484 */
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100485 stpt __LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 SAVE_ALL_BASE __LC_SAVE_AREA
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200487 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
488 bnz BASED(pgm_per) # got per exception -> special case
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200489 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700490 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
492 bz BASED(pgm_no_vtime)
493 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
494 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
495 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
496pgm_no_vtime:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens411788e2007-11-20 11:13:32 +0100498 TRACE_IRQS_OFF
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200499 l %r3,__LC_PGM_ILC # load program interruption code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 la %r8,0x7f
501 nr %r8,%r3
502pgm_do_call:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200503 l %r7,BASED(.Ljump_table)
504 sll %r8,2
505 l %r7,0(%r8,%r7) # load address of handler routine
506 la %r2,SP_PTREGS(%r15) # address of register-save area
507 la %r14,BASED(sysc_return)
508 br %r7 # branch to interrupt-handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510#
511# handle per exception
512#
513pgm_per:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200514 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on
515 bnz BASED(pgm_per_std) # ok, normal per event from user space
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516# ok its one of the special cases, now we need to find out which one
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200517 clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW
518 be BASED(pgm_svcper)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519# no interesting special case, ignore PER event
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200520 lm %r12,%r15,__LC_SAVE_AREA
521 lpsw 0x28
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523#
524# Normal per exception
525#
526pgm_per_std:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200527 SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700528 CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
530 bz BASED(pgm_no_vtime2)
531 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
532 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
533 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
534pgm_no_vtime2:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens411788e2007-11-20 11:13:32 +0100536 TRACE_IRQS_OFF
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 l %r1,__TI_task(%r9)
538 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
539 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
540 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
541 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
Michael Grundy4ba069b2006-09-20 15:58:39 +0200542 tm SP_PSW+1(%r15),0x01 # kernel per event ?
543 bz BASED(kernel_per)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200544 l %r3,__LC_PGM_ILC # load program interruption code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 la %r8,0x7f
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200546 nr %r8,%r3 # clear per-event-bit and ilc
547 be BASED(sysc_return) # only per or per+check ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 b BASED(pgm_do_call)
549
550#
551# it was a single stepped SVC that is causing all the trouble
552#
553pgm_svcper:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200554 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700555 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
557 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
558 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 lh %r7,0x8a # get svc number from lowcore
560 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens411788e2007-11-20 11:13:32 +0100561 TRACE_IRQS_OFF
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 l %r1,__TI_task(%r9)
563 mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
564 mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
565 mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
566 oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
Heiko Carstens1f194a42006-07-03 00:24:46 -0700567 TRACE_IRQS_ON
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
569 b BASED(sysc_do_svc)
570
Michael Grundy4ba069b2006-09-20 15:58:39 +0200571#
572# per was called from kernel, must be kprobes
573#
574kernel_per:
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100575 mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check
576 mvi SP_SVCNR+1(%r15),0xff
Michael Grundy4ba069b2006-09-20 15:58:39 +0200577 la %r2,SP_PTREGS(%r15) # address of register-save area
578 l %r1,BASED(.Lhandle_per) # load adr. of per handler
Heiko Carstens411788e2007-11-20 11:13:32 +0100579 la %r14,BASED(sysc_restore)# load adr. of system return
Michael Grundy4ba069b2006-09-20 15:58:39 +0200580 br %r1 # branch to do_single_step
581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582/*
583 * IO interrupt handler routine
584 */
585
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200586 .globl io_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587io_int_handler:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 stck __LC_INT_CLOCK
Martin Schwidefsky9cfb9b32008-12-31 15:11:41 +0100589 stpt __LC_ASYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 SAVE_ALL_BASE __LC_SAVE_AREA+16
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200591 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
Heiko Carstens77fa2242005-06-25 14:55:30 -0700592 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
594 bz BASED(io_no_vtime)
595 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
596 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
597 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
598io_no_vtime:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens1f194a42006-07-03 00:24:46 -0700600 TRACE_IRQS_OFF
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200601 l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ
602 la %r2,SP_PTREGS(%r15) # address of register-save area
603 basr %r14,%r1 # branch to standard irq handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604io_return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 tm __TI_flags+3(%r9),_TIF_WORK_INT
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200606 bnz BASED(io_work) # there is work to do (signals etc.)
Heiko Carstens411788e2007-11-20 11:13:32 +0100607io_restore:
608#ifdef CONFIG_TRACE_IRQFLAGS
609 la %r1,BASED(io_restore_trace_psw)
610 lpsw 0(%r1)
611io_restore_trace:
612 TRACE_IRQS_CHECK
Heiko Carstens523b44c2007-10-11 22:11:12 +0200613 LOCKDEP_SYS_EXIT
Heiko Carstens411788e2007-11-20 11:13:32 +0100614#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615io_leave:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200616 RESTORE_ALL __LC_RETURN_PSW,0
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700617io_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Heiko Carstens411788e2007-11-20 11:13:32 +0100619#ifdef CONFIG_TRACE_IRQFLAGS
620 .align 8
621 .globl io_restore_trace_psw
622io_restore_trace_psw:
623 .long 0, io_restore_trace + 0x80000000
624#endif
625
Martin Schwidefsky26889052008-05-07 09:22:52 +0200626#
627# switch to kernel stack, then check the TIF bits
628#
629io_work:
630 tm SP_PSW+1(%r15),0x01 # returning to user ?
631#ifndef CONFIG_PREEMPT
632 bno BASED(io_restore) # no-> skip resched & signal
633#else
634 bnz BASED(io_work_user) # no -> check for preemptive scheduling
635 # check for preemptive scheduling
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 icm %r0,15,__TI_precount(%r9)
Martin Schwidefsky26889052008-05-07 09:22:52 +0200637 bnz BASED(io_restore) # preemption disabled
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 l %r1,SP_R15(%r15)
639 s %r1,BASED(.Lc_spsize)
640 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200641 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 lr %r15,%r1
643io_resume_loop:
644 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
Heiko Carstens411788e2007-11-20 11:13:32 +0100645 bno BASED(io_restore)
Heiko Carstensb8e7a542007-11-20 11:13:35 +0100646 l %r1,BASED(.Lpreempt_schedule_irq)
647 la %r14,BASED(io_resume_loop)
648 br %r1 # call schedule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649#endif
650
Martin Schwidefsky26889052008-05-07 09:22:52 +0200651io_work_user:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 l %r1,__LC_KERNEL_STACK
653 s %r1,BASED(.Lc_spsize)
654 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200655 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 lr %r15,%r1
657#
658# One of the work bits is on. Find out which one.
Roland McGrath02a029b2008-04-30 00:53:08 -0700659# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200660# and _TIF_MCCK_PENDING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661#
662io_work_loop:
Heiko Carstens77fa2242005-06-25 14:55:30 -0700663 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200664 bo BASED(io_mcck_pending)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
666 bo BASED(io_reschedule)
Roland McGrath02a029b2008-04-30 00:53:08 -0700667 tm __TI_flags+3(%r9),_TIF_SIGPENDING
Heiko Carstens54dfe5dd2006-02-01 03:06:38 -0800668 bnz BASED(io_sigpending)
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200669 tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
670 bnz BASED(io_notify_resume)
Heiko Carstens411788e2007-11-20 11:13:32 +0100671 b BASED(io_restore)
672io_work_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673
674#
Heiko Carstens77fa2242005-06-25 14:55:30 -0700675# _TIF_MCCK_PENDING is set, call handler
676#
677io_mcck_pending:
678 l %r1,BASED(.Ls390_handle_mcck)
Heiko Carstensb771aea2007-07-27 12:29:18 +0200679 basr %r14,%r1 # TIF bit will be cleared by handler
Heiko Carstensb771aea2007-07-27 12:29:18 +0200680 b BASED(io_work_loop)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700681
682#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683# _TIF_NEED_RESCHED is set, call schedule
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200684#
685io_reschedule:
Heiko Carstens411788e2007-11-20 11:13:32 +0100686 TRACE_IRQS_ON
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200687 l %r1,BASED(.Lschedule)
688 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
689 basr %r14,%r1 # call scheduler
690 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
Heiko Carstens411788e2007-11-20 11:13:32 +0100691 TRACE_IRQS_OFF
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 tm __TI_flags+3(%r9),_TIF_WORK_INT
Heiko Carstens411788e2007-11-20 11:13:32 +0100693 bz BASED(io_restore) # there is no work to do
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 b BASED(io_work_loop)
695
696#
Roland McGrath02a029b2008-04-30 00:53:08 -0700697# _TIF_SIGPENDING is set, call do_signal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698#
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200699io_sigpending:
Heiko Carstens411788e2007-11-20 11:13:32 +0100700 TRACE_IRQS_ON
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200701 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
702 la %r2,SP_PTREGS(%r15) # load pt_regs
703 l %r1,BASED(.Ldo_signal)
704 basr %r14,%r1 # call do_signal
705 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
Heiko Carstens411788e2007-11-20 11:13:32 +0100706 TRACE_IRQS_OFF
Heiko Carstense1c3ad92005-11-07 00:59:02 -0800707 b BASED(io_work_loop)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200709#
710# _TIF_SIGPENDING is set, call do_signal
711#
712io_notify_resume:
713 TRACE_IRQS_ON
714 stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
715 la %r2,SP_PTREGS(%r15) # load pt_regs
716 l %r1,BASED(.Ldo_notify_resume)
717 basr %r14,%r1 # call do_signal
718 stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
719 TRACE_IRQS_OFF
720 b BASED(io_work_loop)
721
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722/*
723 * External interrupt handler routine
724 */
725
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200726 .globl ext_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727ext_int_handler:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 stck __LC_INT_CLOCK
Martin Schwidefsky9cfb9b32008-12-31 15:11:41 +0100729 stpt __LC_ASYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 SAVE_ALL_BASE __LC_SAVE_AREA+16
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200731 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
Heiko Carstens77fa2242005-06-25 14:55:30 -0700732 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
734 bz BASED(ext_no_vtime)
735 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
736 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
737 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
738ext_no_vtime:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
Heiko Carstens1f194a42006-07-03 00:24:46 -0700740 TRACE_IRQS_OFF
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200741 la %r2,SP_PTREGS(%r15) # address of register-save area
742 lh %r3,__LC_EXT_INT_CODE # get interruption code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 l %r1,BASED(.Ldo_extint)
744 basr %r14,%r1
745 b BASED(io_return)
746
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700747__critical_end:
748
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749/*
750 * Machine check handler routines
751 */
752
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200753 .globl mcck_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754mcck_int_handler:
Martin Schwidefsky9cfb9b32008-12-31 15:11:41 +0100755 stck __LC_INT_CLOCK
Heiko Carstens77fa2242005-06-25 14:55:30 -0700756 spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer
757 lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 SAVE_ALL_BASE __LC_SAVE_AREA+32
Heiko Carstens77fa2242005-06-25 14:55:30 -0700759 la %r12,__LC_MCK_OLD_PSW
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200760 tm __LC_MCCK_CODE,0x80 # system damage?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700761 bo BASED(mcck_int_main) # yes -> rest of mcck code invalid
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200762 mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER
763 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
764 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
765 bo BASED(1f)
766 la %r14,__LC_SYNC_ENTER_TIMER
767 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
768 bl BASED(0f)
769 la %r14,__LC_ASYNC_ENTER_TIMER
7700: clc 0(8,%r14),__LC_EXIT_TIMER
771 bl BASED(0f)
772 la %r14,__LC_EXIT_TIMER
7730: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
774 bl BASED(0f)
775 la %r14,__LC_LAST_UPDATE_TIMER
7760: spt 0(%r14)
777 mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14)
Martin Schwidefskyc185b782008-12-25 13:39:25 +01007781: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700779 bno BASED(mcck_int_main) # no -> skip cleanup critical
780 tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
781 bnz BASED(mcck_int_main) # from user -> load async stack
782 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end)
783 bhe BASED(mcck_int_main)
784 clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start)
785 bl BASED(mcck_int_main)
786 l %r14,BASED(.Lcleanup_critical)
787 basr %r14,%r14
788mcck_int_main:
789 l %r14,__LC_PANIC_STACK # are we already on the panic stack?
790 slr %r14,%r15
791 sra %r14,PAGE_SHIFT
792 be BASED(0f)
793 l %r15,__LC_PANIC_STACK # load panic stack
7940: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200795 tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700796 bno BASED(mcck_no_vtime) # no -> skip cleanup critical
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200797 tm SP_PSW+1(%r15),0x01 # interrupting from user ?
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700798 bz BASED(mcck_no_vtime)
799 UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
800 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
801 mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
802mcck_no_vtime:
Heiko Carstens77fa2242005-06-25 14:55:30 -0700803 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
804 la %r2,SP_PTREGS(%r15) # load pt_regs
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200805 l %r1,BASED(.Ls390_mcck)
806 basr %r14,%r1 # call machine check handler
807 tm SP_PSW+1(%r15),0x01 # returning to user ?
Heiko Carstens77fa2242005-06-25 14:55:30 -0700808 bno BASED(mcck_return)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200809 l %r1,__LC_KERNEL_STACK # switch to kernel stack
Heiko Carstens77fa2242005-06-25 14:55:30 -0700810 s %r1,BASED(.Lc_spsize)
811 mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200812 xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
Heiko Carstens77fa2242005-06-25 14:55:30 -0700813 lr %r15,%r1
814 stosm __SF_EMPTY(%r15),0x04 # turn dat on
815 tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
816 bno BASED(mcck_return)
Heiko Carstens1f194a42006-07-03 00:24:46 -0700817 TRACE_IRQS_OFF
Heiko Carstens77fa2242005-06-25 14:55:30 -0700818 l %r1,BASED(.Ls390_handle_mcck)
819 basr %r14,%r1 # call machine check handler
Heiko Carstens1f194a42006-07-03 00:24:46 -0700820 TRACE_IRQS_ON
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821mcck_return:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200822 mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW
823 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200824 mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52
825 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
826 bno BASED(0f)
827 lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
828 stpt __LC_EXIT_TIMER
829 lpsw __LC_RETURN_MCCK_PSW # back to caller
Martin Schwidefskyc185b782008-12-25 13:39:25 +01008300: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200831 lpsw __LC_RETURN_MCCK_PSW # back to caller
832
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200833 RESTORE_ALL __LC_RETURN_MCCK_PSW,0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835/*
836 * Restart interruption handler, kick starter for additional CPUs
837 */
Heiko Carstens84b36a82007-06-19 13:10:03 +0200838#ifdef CONFIG_SMP
Heiko Carstens2bc89b52008-02-05 16:50:40 +0100839 __CPUINIT
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200840 .globl restart_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841restart_int_handler:
Martin Schwidefsky5b409ed2009-04-14 15:36:27 +0200842 basr %r1,0
843restart_base:
844 spt restart_vtime-restart_base(%r1)
845 stck __LC_LAST_UPDATE_CLOCK
846 mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
847 mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200848 l %r15,__LC_SAVE_AREA+60 # load ksp
849 lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
850 lam %a0,%a15,__LC_AREGS_SAVE_AREA
851 lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone
Martin Schwidefsky5b409ed2009-04-14 15:36:27 +0200852 l %r1,__LC_THREAD_INFO
853 mvc __LC_USER_TIMER(8),__TI_user_timer(%r1)
854 mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
855 xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200856 stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on
857 basr %r14,0
858 l %r14,restart_addr-.(%r14)
859 br %r14 # branch to start_secondary
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860restart_addr:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200861 .long start_secondary
Martin Schwidefsky5b409ed2009-04-14 15:36:27 +0200862 .align 8
863restart_vtime:
864 .long 0x7fffffff,0xffffffff
Heiko Carstens84b36a82007-06-19 13:10:03 +0200865 .previous
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866#else
867/*
868 * If we do not run with SMP enabled, let the new CPU crash ...
869 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200870 .globl restart_int_handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871restart_int_handler:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200872 basr %r1,0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873restart_base:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200874 lpsw restart_crash-restart_base(%r1)
875 .align 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876restart_crash:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200877 .long 0x000a0000,0x00000000
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878restart_go:
879#endif
880
881#ifdef CONFIG_CHECK_STACK
882/*
883 * The synchronous or the asynchronous stack overflowed. We are dead.
884 * No need to properly save the registers, we are going to panic anyway.
885 * Setup a pt_regs so that show_trace can provide a good call trace.
886 */
887stack_overflow:
888 l %r15,__LC_PANIC_STACK # change to panic stack
889 sl %r15,BASED(.Lc_spsize)
890 mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
891 stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
892 la %r1,__LC_SAVE_AREA
893 ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ?
894 be BASED(0f)
895 ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ?
896 be BASED(0f)
897 la %r1,__LC_SAVE_AREA+16
8980: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200899 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 l %r1,BASED(1f) # branch to kernel_stack_overflow
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200901 la %r2,SP_PTREGS(%r15) # load pt_regs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 br %r1
Heiko Carstens25d83cb2006-09-28 16:56:37 +02009031: .long kernel_stack_overflow
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904#endif
905
906cleanup_table_system_call:
907 .long system_call + 0x80000000, sysc_do_svc + 0x80000000
908cleanup_table_sysc_return:
909 .long sysc_return + 0x80000000, sysc_leave + 0x80000000
910cleanup_table_sysc_leave:
Heiko Carstens411788e2007-11-20 11:13:32 +0100911 .long sysc_leave + 0x80000000, sysc_done + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912cleanup_table_sysc_work_loop:
Heiko Carstens411788e2007-11-20 11:13:32 +0100913 .long sysc_work_loop + 0x80000000, sysc_work_done + 0x80000000
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200914cleanup_table_io_return:
915 .long io_return + 0x80000000, io_leave + 0x80000000
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700916cleanup_table_io_leave:
917 .long io_leave + 0x80000000, io_done + 0x80000000
918cleanup_table_io_work_loop:
Heiko Carstens411788e2007-11-20 11:13:32 +0100919 .long io_work_loop + 0x80000000, io_work_done + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
921cleanup_critical:
922 clc 4(4,%r12),BASED(cleanup_table_system_call)
923 bl BASED(0f)
924 clc 4(4,%r12),BASED(cleanup_table_system_call+4)
925 bl BASED(cleanup_system_call)
9260:
927 clc 4(4,%r12),BASED(cleanup_table_sysc_return)
928 bl BASED(0f)
929 clc 4(4,%r12),BASED(cleanup_table_sysc_return+4)
930 bl BASED(cleanup_sysc_return)
9310:
932 clc 4(4,%r12),BASED(cleanup_table_sysc_leave)
933 bl BASED(0f)
934 clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4)
935 bl BASED(cleanup_sysc_leave)
9360:
937 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop)
938 bl BASED(0f)
939 clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700940 bl BASED(cleanup_sysc_return)
Linus Torvalds1da177e2005-04-16 15:20:36 -07009410:
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200942 clc 4(4,%r12),BASED(cleanup_table_io_return)
943 bl BASED(0f)
944 clc 4(4,%r12),BASED(cleanup_table_io_return+4)
945 bl BASED(cleanup_io_return)
9460:
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700947 clc 4(4,%r12),BASED(cleanup_table_io_leave)
948 bl BASED(0f)
949 clc 4(4,%r12),BASED(cleanup_table_io_leave+4)
950 bl BASED(cleanup_io_leave)
9510:
952 clc 4(4,%r12),BASED(cleanup_table_io_work_loop)
953 bl BASED(0f)
954 clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4)
955 bl BASED(cleanup_io_return)
9560:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 br %r14
958
959cleanup_system_call:
960 mvc __LC_RETURN_PSW(8),0(%r12)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700961 c %r12,BASED(.Lmck_old_psw)
962 be BASED(0f)
963 la %r12,__LC_SAVE_AREA+16
964 b BASED(1f)
9650: la %r12,__LC_SAVE_AREA+32
9661:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
968 bh BASED(0f)
969 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
9700: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8)
971 bhe BASED(cleanup_vtime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
973 bh BASED(0f)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700974 mvc __LC_SAVE_AREA(16),0(%r12)
9750: st %r13,4(%r12)
976 st %r12,__LC_SAVE_AREA+48 # argh
Martin Schwidefsky63b12242006-06-29 14:58:05 +0200977 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Heiko Carstens77fa2242005-06-25 14:55:30 -0700978 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -0700979 l %r12,__LC_SAVE_AREA+48 # argh
980 st %r15,12(%r12)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 lh %r7,0x8a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982cleanup_vtime:
983 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
984 bhe BASED(cleanup_stime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
986cleanup_stime:
987 clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16)
988 bh BASED(cleanup_update)
989 UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
990cleanup_update:
991 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4)
993 la %r12,__LC_RETURN_PSW
994 br %r14
995cleanup_system_call_insn:
996 .long sysc_saveall + 0x80000000
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200997 .long system_call + 0x80000000
998 .long sysc_vtime + 0x80000000
999 .long sysc_stime + 0x80000000
1000 .long sysc_update + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
1002cleanup_sysc_return:
1003 mvc __LC_RETURN_PSW(4),0(%r12)
1004 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return)
1005 la %r12,__LC_RETURN_PSW
1006 br %r14
1007
1008cleanup_sysc_leave:
1009 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001010 be BASED(2f)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
1012 clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001013 be BASED(2f)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001015 c %r12,BASED(.Lmck_old_psw)
1016 bne BASED(0f)
1017 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15)
1018 b BASED(1f)
10190: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15)
10201: lm %r0,%r11,SP_R0(%r15)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 l %r15,SP_R15(%r15)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -070010222: la %r12,__LC_RETURN_PSW
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 br %r14
1024cleanup_sysc_leave_insn:
Heiko Carstens411788e2007-11-20 11:13:32 +01001025 .long sysc_done - 4 + 0x80000000
Heiko Carstens411788e2007-11-20 11:13:32 +01001026 .long sysc_done - 8 + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001028cleanup_io_return:
1029 mvc __LC_RETURN_PSW(4),0(%r12)
1030 mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop)
1031 la %r12,__LC_RETURN_PSW
1032 br %r14
1033
1034cleanup_io_leave:
1035 clc 4(4,%r12),BASED(cleanup_io_leave_insn)
1036 be BASED(2f)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001037 mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
1038 clc 4(4,%r12),BASED(cleanup_io_leave_insn+4)
1039 be BASED(2f)
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001040 mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
1041 c %r12,BASED(.Lmck_old_psw)
1042 bne BASED(0f)
1043 mvc __LC_SAVE_AREA+32(16),SP_R12(%r15)
1044 b BASED(1f)
10450: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15)
10461: lm %r0,%r11,SP_R0(%r15)
1047 l %r15,SP_R15(%r15)
10482: la %r12,__LC_RETURN_PSW
1049 br %r14
1050cleanup_io_leave_insn:
Heiko Carstens411788e2007-11-20 11:13:32 +01001051 .long io_done - 4 + 0x80000000
Heiko Carstens411788e2007-11-20 11:13:32 +01001052 .long io_done - 8 + 0x80000000
Martin Schwidefskyae6aa2e2005-09-03 15:57:56 -07001053
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054/*
1055 * Integer constants
1056 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001057 .align 4
1058.Lc_spsize: .long SP_SIZE
1059.Lc_overhead: .long STACK_FRAME_OVERHEAD
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001060.Lnr_syscalls: .long NR_syscalls
1061.L0x018: .short 0x018
1062.L0x020: .short 0x020
1063.L0x028: .short 0x028
1064.L0x030: .short 0x030
1065.L0x038: .short 0x038
1066.Lc_1: .long 1
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067
1068/*
1069 * Symbol constants
1070 */
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001071.Ls390_mcck: .long s390_do_machine_check
Heiko Carstens77fa2242005-06-25 14:55:30 -07001072.Ls390_handle_mcck:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001073 .long s390_handle_mcck
1074.Lmck_old_psw: .long __LC_MCK_OLD_PSW
1075.Ldo_IRQ: .long do_IRQ
1076.Ldo_extint: .long do_extint
1077.Ldo_signal: .long do_signal
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +02001078.Ldo_notify_resume:
1079 .long do_notify_resume
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001080.Lhandle_per: .long do_single_step
Martin Schwidefsky03ff9a22007-04-27 16:01:40 +02001081.Ldo_execve: .long do_execve
1082.Lexecve_tail: .long execve_tail
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001083.Ljump_table: .long pgm_check_table
1084.Lschedule: .long schedule
Christian Borntraegerab1809b2007-12-04 16:09:04 +01001085#ifdef CONFIG_PREEMPT
Heiko Carstensb8e7a542007-11-20 11:13:35 +01001086.Lpreempt_schedule_irq:
1087 .long preempt_schedule_irq
Christian Borntraegerab1809b2007-12-04 16:09:04 +01001088#endif
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +02001089.Ltrace_entry: .long do_syscall_trace_enter
1090.Ltrace_exit: .long do_syscall_trace_exit
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001091.Lschedtail: .long schedule_tail
1092.Lsysc_table: .long sys_call_table
Heiko Carstens1f194a42006-07-03 00:24:46 -07001093#ifdef CONFIG_TRACE_IRQFLAGS
Heiko Carstens50bec4c2008-11-14 18:18:05 +01001094.Ltrace_irq_on_caller:
1095 .long trace_hardirqs_on_caller
1096.Ltrace_irq_off_caller:
1097 .long trace_hardirqs_off_caller
Heiko Carstensaf4c68742008-11-14 18:18:03 +01001098#endif
1099#ifdef CONFIG_LOCKDEP
Heiko Carstens523b44c2007-10-11 22:11:12 +02001100.Llockdep_sys_exit:
1101 .long lockdep_sys_exit
Heiko Carstens1f194a42006-07-03 00:24:46 -07001102#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103.Lcritical_start:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001104 .long __critical_start + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105.Lcritical_end:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001106 .long __critical_end + 0x80000000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107.Lcleanup_critical:
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001108 .long cleanup_critical
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109
Heiko Carstens25d83cb2006-09-28 16:56:37 +02001110 .section .rodata, "a"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111#define SYSCALL(esa,esame,emu) .long esa
Heiko Carstens9bf12262009-06-12 10:26:47 +02001112 .globl sys_call_table
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113sys_call_table:
1114#include "syscalls.S"
1115#undef SYSCALL