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s390/exceptions: switch to relative exception table entries
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / s390 / kernel / entry64.S
CommitLineData
1da177e4 1/*
1da177e4
LT		 2 * S390 low-level entry points.
3 *
a53c8fab 4 * Copyright IBM Corp. 1999, 2012
1da177e4 5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
25d83cbf
HC		 6 * Hartmut Penner (hp@de.ibm.com),
7 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
77fa2245 8 * Heiko Carstens <heiko.carstens@de.ibm.com>
1da177e4
LT		 9 */
10
2bc89b5e 11#include <linux/init.h>
144d634a 12#include <linux/linkage.h>
eb608fb3 13#include <asm/processor.h>
1da177e4 14#include <asm/cache.h>
1da177e4
LT		 15#include <asm/errno.h>
16#include <asm/ptrace.h>
17#include <asm/thread_info.h>
0013a854 18#include <asm/asm-offsets.h>
1da177e4
LT		 19#include <asm/unistd.h>
20#include <asm/page.h>
eb546195 21#include <asm/sigp.h>
1da177e4 22
c5328901
MS		 23__PT_R0 = __PT_GPRS
24__PT_R1 = __PT_GPRS + 8
25__PT_R2 = __PT_GPRS + 16
26__PT_R3 = __PT_GPRS + 24
27__PT_R4 = __PT_GPRS + 32
28__PT_R5 = __PT_GPRS + 40
29__PT_R6 = __PT_GPRS + 48
30__PT_R7 = __PT_GPRS + 56
31__PT_R8 = __PT_GPRS + 64
32__PT_R9 = __PT_GPRS + 72
33__PT_R10 = __PT_GPRS + 80
34__PT_R11 = __PT_GPRS + 88
35__PT_R12 = __PT_GPRS + 96
36__PT_R13 = __PT_GPRS + 104
37__PT_R14 = __PT_GPRS + 112
38__PT_R15 = __PT_GPRS + 120
1da177e4
LT		 39
40STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
41STACK_SIZE = 1 << STACK_SHIFT
42
753c4dd6 43_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
b6ef5bb3 44 _TIF_MCCK_PENDING | _TIF_PER_TRAP )
753c4dd6 45_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
54dfe5dd 46 _TIF_MCCK_PENDING)
b6ef5bb3
MS		 47_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
48 _TIF_SYSCALL_TRACEPOINT)
603d1a50 49_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
1da177e4
LT		 50
51#define BASED(name) name-system_call(%r13)
52
1f194a4c 53 .macro TRACE_IRQS_ON
c5328901 54#ifdef CONFIG_TRACE_IRQFLAGS
6a2df3a8
MS		 55 basr %r2,%r0
56 brasl %r14,trace_hardirqs_on_caller
c5328901 57#endif
1f194a4c
HC		 58 .endm
59
60 .macro TRACE_IRQS_OFF
c5328901 61#ifdef CONFIG_TRACE_IRQFLAGS
6a2df3a8
MS		 62 basr %r2,%r0
63 brasl %r14,trace_hardirqs_off_caller
411788ea 64#endif
c5328901 65 .endm
411788ea 66
411788ea 67 .macro LOCKDEP_SYS_EXIT
c5328901
MS		 68#ifdef CONFIG_LOCKDEP
69 tm __PT_PSW+1(%r11),0x01 # returning to user ?
70 jz .+10
411788ea 71 brasl %r14,lockdep_sys_exit
1f194a4c 72#endif
1da177e4 73 .endm
1da177e4 74
c5328901
MS		 75 .macro SPP newpp
76#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
77 tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP
78 jz .+8
79 .insn s,0xb2800000,\newpp
80#endif
81 .endm
1da177e4 82
c5328901
MS		 83 .macro HANDLE_SIE_INTERCEPT scratch
84#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
6022afc0
MS		 85 tmhh %r8,0x0001 # interrupting from user ?
86 jnz .+42
c5328901
MS		 87 lgr \scratch,%r9
88 slg \scratch,BASED(.Lsie_loop)
89 clg \scratch,BASED(.Lsie_length)
6022afc0 90 jhe .+22
c5328901 91 lg %r9,BASED(.Lsie_loop)
9ee39e4b 92 SPP BASED(.Lhost_id) # set host id
c5328901 93#endif
987ad70a
MS		 94 .endm
95
c5328901 96 .macro CHECK_STACK stacksize,savearea
63b12246 97#ifdef CONFIG_CHECK_STACK
c5328901
MS		 98 tml %r15,\stacksize - CONFIG_STACK_GUARD
99 lghi %r14,\savearea
100 jz stack_overflow
63b12246 101#endif
63b12246
MS		 102 .endm
103
c5328901
MS		 104 .macro SWITCH_ASYNC savearea,stack,shift
105 tmhh %r8,0x0001 # interrupting from user ?
106 jnz 1f
107 lgr %r14,%r9
108 slg %r14,BASED(.Lcritical_start)
109 clg %r14,BASED(.Lcritical_length)
1da177e4 110 jhe 0f
c5328901 111 lghi %r11,\savearea # inside critical section, do cleanup
1da177e4 112 brasl %r14,cleanup_critical
c5328901 113 tmhh %r8,0x0001 # retest problem state after cleanup
1da177e4 114 jnz 1f
c5328901 1150: lg %r14,\stack # are we already on the target stack?
1da177e4 116 slgr %r14,%r15
c5328901 117 srag %r14,%r14,\shift
86f2552b 118 jnz 1f
c5328901
MS		 119 CHECK_STACK 1<<\shift,\savearea
120 j 2f
1211: lg %r15,\stack # load target stack
1222: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
123 la %r11,STACK_FRAME_OVERHEAD(%r15)
25d83cbf 124 .endm
1da177e4 125
c5328901
MS		 126 .macro UPDATE_VTIME scratch,enter_timer
127 lg \scratch,__LC_EXIT_TIMER
128 slg \scratch,\enter_timer
129 alg \scratch,__LC_USER_TIMER
130 stg \scratch,__LC_USER_TIMER
131 lg \scratch,__LC_LAST_UPDATE_TIMER
132 slg \scratch,__LC_EXIT_TIMER
133 alg \scratch,__LC_SYSTEM_TIMER
134 stg \scratch,__LC_SYSTEM_TIMER
135 mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer
1da177e4
LT		 136 .endm
137
c5328901
MS		 138 .macro LAST_BREAK scratch
139 srag \scratch,%r10,23
140 jz .+10
141 stg %r10,__TI_last_break(%r12)
86f2552b
MS		 142 .endm
143
1e54622e 144 .macro REENABLE_IRQS
c5328901
MS		 145 stg %r8,__LC_RETURN_PSW
146 ni __LC_RETURN_PSW,0xbf
147 ssm __LC_RETURN_PSW
1e54622e
MS		 148 .endm
149
473e66ba 150 .macro STCK savearea
d652d596 151#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
473e66ba
HC		 152 .insn s,0xb27c0000,\savearea # store clock fast
153#else
154 .insn s,0xb2050000,\savearea # store clock
155#endif
156 .endm
157
860dba45
MS		 158 .section .kprobes.text, "ax"
159
1da177e4
LT		 160/*
161 * Scheduler resume function, called by switch_to
162 * gpr2 = (task_struct *) prev
163 * gpr3 = (task_struct *) next
164 * Returns:
165 * gpr2 = prev
166 */
144d634a 167ENTRY(__switch_to)
eda0c6d6
MS		 168 stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
169 stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev
5e9a2692
MS		 170 lg %r4,__THREAD_info(%r2) # get thread_info of prev
171 lg %r5,__THREAD_info(%r3) # get thread_info of next
eda0c6d6
MS		 172 lgr %r15,%r5
173 aghi %r15,STACK_SIZE # end of kernel stack of next
174 stg %r3,__LC_CURRENT # store task struct of next
175 stg %r5,__LC_THREAD_INFO # store thread info of next
176 stg %r15,__LC_KERNEL_STACK # store end of kernel stack
177 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
178 mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
179 lg %r15,__THREAD_ksp(%r3) # load kernel stack of next
77fa2245 180 tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
5e9a2692
MS		 181 jz 0f
182 ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
183 oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next
eda0c6d6 1840: lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
1da177e4
LT		 185 br %r14
186
187__critical_start:
188/*
189 * SVC interrupt handler routine. System calls are synchronous events and
190 * are executed with interrupts enabled.
191 */
192
144d634a 193ENTRY(system_call)
c185b783 194 stpt __LC_SYNC_ENTER_TIMER
c5328901
MS		 195sysc_stmg:
196 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
197 lg %r10,__LC_LAST_BREAK
198 lg %r12,__LC_THREAD_INFO
199 larl %r13,system_call
200sysc_per:
201 lg %r15,__LC_KERNEL_STACK
202 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
203 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
1da177e4 204sysc_vtime:
c5328901
MS		 205 UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER
206 LAST_BREAK %r13
207 stmg %r0,%r7,__PT_R0(%r11)
208 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
209 mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
aa33c8cb 210 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
1da177e4 211sysc_do_svc:
c5328901 212 oi __TI_flags+7(%r12),_TIF_SYSCALL
aa33c8cb 213 llgh %r8,__PT_INT_CODE+2(%r11)
c5328901 214 slag %r8,%r8,2 # shift and test for svc 0
1da177e4
LT		 215 jnz sysc_nr_ok
216 # svc 0: system call number in %r1
c5328901 217 llgfr %r1,%r1 # clear high word in r1
86f2552b 218 cghi %r1,NR_syscalls
1da177e4 219 jnl sysc_nr_ok
aa33c8cb 220 sth %r1,__PT_INT_CODE+2(%r11)
c5328901 221 slag %r8,%r1,2
1da177e4 222sysc_nr_ok:
c5328901 223 larl %r10,sys_call_table # 64 bit system call table
347a8dc3 224#ifdef CONFIG_COMPAT
c5328901 225 tm __TI_flags+5(%r12),(_TIF_31BIT>>16)
c563077e 226 jno sysc_noemu
c5328901 227 larl %r10,sys_call_table_emu # 31 bit system call table
1da177e4
LT		 228sysc_noemu:
229#endif
c5328901
MS		 230 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
231 stg %r2,__PT_ORIG_GPR2(%r11)
232 stg %r7,STACK_FRAME_OVERHEAD(%r15)
233 lgf %r9,0(%r8,%r10) # get system call add.
b6ef5bb3 234 tm __TI_flags+6(%r12),_TIF_TRACE >> 8
25d83cbf 235 jnz sysc_tracesys
c5328901
MS		 236 basr %r14,%r9 # call sys_xxxx
237 stg %r2,__PT_R2(%r11) # store return value
1da177e4
LT		 238
239sysc_return:
6a2df3a8
MS		 240 LOCKDEP_SYS_EXIT
241sysc_tif:
c5328901 242 tm __PT_PSW+1(%r11),0x01 # returning to user ?
b6ef5bb3 243 jno sysc_restore
86f2552b 244 tm __TI_flags+7(%r12),_TIF_WORK_SVC
c5328901 245 jnz sysc_work # check for work
b6ef5bb3 246 ni __TI_flags+7(%r12),255-_TIF_SYSCALL
411788ea 247sysc_restore:
c5328901
MS		 248 lg %r14,__LC_VDSO_PER_CPU
249 lmg %r0,%r10,__PT_R0(%r11)
250 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
251 stpt __LC_EXIT_TIMER
252 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
253 lmg %r11,%r15,__PT_R11(%r11)
254 lpswe __LC_RETURN_PSW
411788ea
HC		 255sysc_done:
256
43d399d2
MS		 257#
258# One of the work bits is on. Find out which one.
259#
b6ef5bb3 260sysc_work:
86f2552b 261 tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
77fa2245 262 jo sysc_mcck_pending
86f2552b 263 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
1da177e4 264 jo sysc_reschedule
86f2552b 265 tm __TI_flags+7(%r12),_TIF_SIGPENDING
43d399d2 266 jo sysc_sigpending
86f2552b 267 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
43d399d2 268 jo sysc_notify_resume
5e9a2692 269 tm __TI_flags+7(%r12),_TIF_PER_TRAP
1da177e4 270 jo sysc_singlestep
43d399d2 271 j sysc_return # beware of critical section cleanup
1da177e4
LT		 272
273#
274# _TIF_NEED_RESCHED is set, call schedule
25d83cbf
HC		 275#
276sysc_reschedule:
6a2df3a8 277 larl %r14,sysc_return
c5328901 278 jg schedule
1da177e4 279
77fa2245
HC		 280#
281# _TIF_MCCK_PENDING is set, call handler
282#
283sysc_mcck_pending:
6a2df3a8 284 larl %r14,sysc_return
25d83cbf 285 jg s390_handle_mcck # TIF bit will be cleared by handler
77fa2245 286
1da177e4 287#
02a029b3 288# _TIF_SIGPENDING is set, call do_signal
1da177e4 289#
25d83cbf 290sysc_sigpending:
5e9a2692 291 ni __TI_flags+7(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
c5328901
MS		 292 lgr %r2,%r11 # pass pointer to pt_regs
293 brasl %r14,do_signal
b6ef5bb3
MS		 294 tm __TI_flags+7(%r12),_TIF_SYSCALL
295 jno sysc_return
c5328901
MS		 296 lmg %r2,%r7,__PT_R2(%r11) # load svc arguments
297 lghi %r8,0 # svc 0 returns -ENOSYS
aa33c8cb 298 lh %r1,__PT_INT_CODE+2(%r11) # load new svc number
b6ef5bb3
MS		 299 cghi %r1,NR_syscalls
300 jnl sysc_nr_ok # invalid svc number -> do svc 0
c5328901 301 slag %r8,%r1,2
b6ef5bb3 302 j sysc_nr_ok # restart svc
1da177e4 303
753c4dd6
MS		 304#
305# _TIF_NOTIFY_RESUME is set, call do_notify_resume
306#
307sysc_notify_resume:
c5328901 308 lgr %r2,%r11 # pass pointer to pt_regs
6a2df3a8 309 larl %r14,sysc_return
c5328901 310 jg do_notify_resume
753c4dd6 311
1da177e4 312#
5e9a2692 313# _TIF_PER_TRAP is set, call do_per_trap
1da177e4
LT		 314#
315sysc_singlestep:
b6ef5bb3 316 ni __TI_flags+7(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP)
c5328901
MS		 317 lgr %r2,%r11 # pass pointer to pt_regs
318 larl %r14,sysc_return
5e9a2692 319 jg do_per_trap
1da177e4 320
1da177e4 321#
753c4dd6
MS		 322# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
323# and after the system call
1da177e4
LT		 324#
325sysc_tracesys:
c5328901 326 lgr %r2,%r11 # pass pointer to pt_regs
1da177e4 327 la %r3,0
aa33c8cb 328 llgh %r0,__PT_INT_CODE+2(%r11)
c5328901 329 stg %r0,__PT_R2(%r11)
753c4dd6 330 brasl %r14,do_syscall_trace_enter
1da177e4 331 lghi %r0,NR_syscalls
753c4dd6 332 clgr %r0,%r2
1da177e4 333 jnh sysc_tracenogo
c5328901
MS		 334 sllg %r8,%r2,2
335 lgf %r9,0(%r8,%r10)
1da177e4 336sysc_tracego:
c5328901
MS		 337 lmg %r3,%r7,__PT_R3(%r11)
338 stg %r7,STACK_FRAME_OVERHEAD(%r15)
339 lg %r2,__PT_ORIG_GPR2(%r11)
340 basr %r14,%r9 # call sys_xxx
341 stg %r2,__PT_R2(%r11) # store return value
1da177e4 342sysc_tracenogo:
b6ef5bb3 343 tm __TI_flags+6(%r12),_TIF_TRACE >> 8
25d83cbf 344 jz sysc_return
c5328901
MS		 345 lgr %r2,%r11 # pass pointer to pt_regs
346 larl %r14,sysc_return
753c4dd6 347 jg do_syscall_trace_exit
1da177e4
LT		 348
349#
350# a new process exits the kernel with ret_from_fork
351#
144d634a 352ENTRY(ret_from_fork)
c5328901
MS		 353 la %r11,STACK_FRAME_OVERHEAD(%r15)
354 lg %r12,__LC_THREAD_INFO
355 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
1da177e4 356 jo 0f
c5328901 357 stg %r15,__PT_R15(%r11) # store stack pointer for new kthread
25d83cbf 3580: brasl %r14,schedule_tail
1f194a4c 359 TRACE_IRQS_ON
c5328901 360 ssm __LC_SVC_NEW_PSW # reenable interrupts
8f2961c3 361 j sysc_tracenogo
1da177e4
LT		 362
363#
03ff9a23
MS		 364# kernel_execve function needs to deal with pt_regs that is not
365# at the usual place
1da177e4 366#
144d634a 367ENTRY(kernel_execve)
03ff9a23
MS		 368 stmg %r12,%r15,96(%r15)
369 lgr %r14,%r15
c5328901 370 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
03ff9a23 371 stg %r14,__SF_BACKCHAIN(%r15)
c5328901 372 la %r12,STACK_FRAME_OVERHEAD(%r15)
03ff9a23
MS		 373 xc 0(__PT_SIZE,%r12),0(%r12)
374 lgr %r5,%r12
375 brasl %r14,do_execve
376 ltgfr %r2,%r2
377 je 0f
c5328901 378 aghi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE)
03ff9a23
MS		 379 lmg %r12,%r15,96(%r15)
380 br %r14
381 # execve succeeded.
c5328901 3820: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
03ff9a23 383 lg %r15,__LC_KERNEL_STACK # load ksp
c5328901
MS		 384 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
385 la %r11,STACK_FRAME_OVERHEAD(%r15)
386 mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs
86f2552b 387 lg %r12,__LC_THREAD_INFO
03ff9a23 388 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
c5328901 389 ssm __LC_SVC_NEW_PSW # reenable interrupts
03ff9a23
MS		 390 brasl %r14,execve_tail
391 j sysc_return
1da177e4
LT		 392
393/*
394 * Program check handler routine
395 */
396
144d634a 397ENTRY(pgm_check_handler)
c185b783 398 stpt __LC_SYNC_ENTER_TIMER
c5328901
MS		 399 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
400 lg %r10,__LC_LAST_BREAK
401 lg %r12,__LC_THREAD_INFO
402 larl %r13,system_call
403 lmg %r8,%r9,__LC_PGM_OLD_PSW
404 HANDLE_SIE_INTERCEPT %r14
405 tmhh %r8,0x0001 # test problem state bit
406 jnz 1f # -> fault in user space
407 tmhh %r8,0x4000 # PER bit set in old PSW ?
408 jnz 0f # -> enabled, can't be a double fault
409 tm __LC_PGM_ILC+3,0x80 # check for per exception
410 jnz pgm_svcper # -> single stepped svc
4110: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
412 j 2f
4131: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER
414 LAST_BREAK %r14
415 lg %r15,__LC_KERNEL_STACK
d35339a4
MS		 416 lg %r14,__TI_task(%r12)
417 lghi %r13,__LC_PGM_TDB
418 tm __LC_PGM_ILC+2,0x02 # check for transaction abort
419 jz 2f
420 mvc __THREAD_trap_tdb(256,%r14),0(%r13)
c5328901
MS		 4212: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
422 la %r11,STACK_FRAME_OVERHEAD(%r15)
423 stmg %r0,%r7,__PT_R0(%r11)
424 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
425 stmg %r8,%r9,__PT_PSW(%r11)
aa33c8cb
MS		 426 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
427 mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
c5328901
MS		 428 stg %r10,__PT_ARGS(%r11)
429 tm __LC_PGM_ILC+3,0x80 # check for per exception
430 jz 0f
c5328901
MS		 431 tmhh %r8,0x0001 # kernel per event ?
432 jz pgm_kprobe
433 oi __TI_flags+7(%r12),_TIF_PER_TRAP
d35339a4
MS		 434 mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS
435 mvc __THREAD_per_cause(2,%r14),__LC_PER_CAUSE
436 mvc __THREAD_per_paid(1,%r14),__LC_PER_PAID
aa33c8cb 4370: REENABLE_IRQS
c5328901 438 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
f5cdac27 439 larl %r1,pgm_check_table
aa33c8cb
MS		 440 llgh %r10,__PT_INT_CODE+2(%r11)
441 nill %r10,0x007f
442 sll %r10,3
443 je sysc_return
c5328901
MS		 444 lg %r1,0(%r10,%r1) # load address of handler routine
445 lgr %r2,%r11 # pass pointer to pt_regs
f5cdac27 446 basr %r14,%r1 # branch to interrupt-handler
f5cdac27 447 j sysc_return
1da177e4
LT		 448
449#
c5328901 450# PER event in supervisor state, must be kprobes
1da177e4 451#
c5328901
MS		 452pgm_kprobe:
453 REENABLE_IRQS
454 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
455 lgr %r2,%r11 # pass pointer to pt_regs
456 brasl %r14,do_per_trap
457 j sysc_return
1da177e4 458
4ba069b8 459#
c5328901 460# single stepped system call
4ba069b8 461#
c5328901
MS		 462pgm_svcper:
463 oi __TI_flags+7(%r12),_TIF_PER_TRAP
464 mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
465 larl %r14,sysc_per
466 stg %r14,__LC_RETURN_PSW+8
467 lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs
4ba069b8 468
1da177e4
LT		 469/*
470 * IO interrupt handler routine
471 */
144d634a 472ENTRY(io_int_handler)
473e66ba 473 STCK __LC_INT_CLOCK
9cfb9b3c 474 stpt __LC_ASYNC_ENTER_TIMER
c5328901
MS		 475 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
476 lg %r10,__LC_LAST_BREAK
477 lg %r12,__LC_THREAD_INFO
478 larl %r13,system_call
479 lmg %r8,%r9,__LC_IO_OLD_PSW
480 HANDLE_SIE_INTERCEPT %r14
481 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
482 tmhh %r8,0x0001 # interrupting from user?
483 jz io_skip
484 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
485 LAST_BREAK %r14
486io_skip:
487 stmg %r0,%r7,__PT_R0(%r11)
488 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
489 stmg %r8,%r9,__PT_PSW(%r11)
1f194a4c 490 TRACE_IRQS_OFF
c5328901
MS		 491 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
492 lgr %r2,%r11 # pass pointer to pt_regs
493 brasl %r14,do_IRQ
1da177e4 494io_return:
6a2df3a8
MS		 495 LOCKDEP_SYS_EXIT
496 TRACE_IRQS_ON
497io_tif:
86f2552b 498 tm __TI_flags+7(%r12),_TIF_WORK_INT
25d83cbf 499 jnz io_work # there is work to do (signals etc.)
411788ea 500io_restore:
c5328901
MS		 501 lg %r14,__LC_VDSO_PER_CPU
502 lmg %r0,%r10,__PT_R0(%r11)
503 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
c5328901
MS		 504 stpt __LC_EXIT_TIMER
505 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
506 lmg %r11,%r15,__PT_R11(%r11)
507 lpswe __LC_RETURN_PSW
ae6aa2ea 508io_done:
1da177e4 509
2688905e 510#
43d399d2
MS		 511# There is work todo, find out in which context we have been interrupted:
512# 1) if we return to user space we can do all _TIF_WORK_INT work
513# 2) if we return to kernel code and kvm is enabled check if we need to
514# modify the psw to leave SIE
515# 3) if we return to kernel code and preemptive scheduling is enabled check
516# the preemption counter and if it is zero call preempt_schedule_irq
517# Before any work can be done, a switch to the kernel stack is required.
2688905e
MS		 518#
519io_work:
c5328901 520 tm __PT_PSW+1(%r11),0x01 # returning to user ?
43d399d2 521 jo io_work_user # yes -> do resched & signal
43d399d2 522#ifdef CONFIG_PREEMPT
2688905e 523 # check for preemptive scheduling
86f2552b 524 icm %r0,15,__TI_precount(%r12)
2688905e 525 jnz io_restore # preemption is disabled
6a2df3a8
MS		 526 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
527 jno io_restore
1da177e4 528 # switch to kernel stack
c5328901
MS		 529 lg %r1,__PT_R15(%r11)
530 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
531 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
532 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
533 la %r11,STACK_FRAME_OVERHEAD(%r1)
1da177e4 534 lgr %r15,%r1
6a2df3a8
MS		 535 # TRACE_IRQS_ON already done at io_return, call
536 # TRACE_IRQS_OFF to keep things symmetrical
537 TRACE_IRQS_OFF
538 brasl %r14,preempt_schedule_irq
539 j io_return
540#else
43d399d2 541 j io_restore
6a2df3a8 542#endif
1da177e4 543
43d399d2
MS		 544#
545# Need to do work before returning to userspace, switch to kernel stack
546#
2688905e 547io_work_user:
1da177e4 548 lg %r1,__LC_KERNEL_STACK
c5328901
MS		 549 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
550 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
551 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
552 la %r11,STACK_FRAME_OVERHEAD(%r1)
1da177e4 553 lgr %r15,%r1
43d399d2 554
1da177e4
LT		 555#
556# One of the work bits is on. Find out which one.
43d399d2 557# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED
54dfe5dd 558# and _TIF_MCCK_PENDING
1da177e4 559#
6a2df3a8 560io_work_tif:
86f2552b 561 tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
77fa2245 562 jo io_mcck_pending
86f2552b 563 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
1da177e4 564 jo io_reschedule
86f2552b 565 tm __TI_flags+7(%r12),_TIF_SIGPENDING
43d399d2 566 jo io_sigpending
86f2552b 567 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
43d399d2
MS		 568 jo io_notify_resume
569 j io_return # beware of critical section cleanup
0eaeafa1 570
77fa2245
HC		 571#
572# _TIF_MCCK_PENDING is set, call handler
573#
574io_mcck_pending:
6a2df3a8 575 # TRACE_IRQS_ON already done at io_return
b771aeac 576 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler
6a2df3a8
MS		 577 TRACE_IRQS_OFF
578 j io_return
77fa2245 579
1da177e4
LT		 580#
581# _TIF_NEED_RESCHED is set, call schedule
25d83cbf
HC		 582#
583io_reschedule:
6a2df3a8 584 # TRACE_IRQS_ON already done at io_return
c5328901 585 ssm __LC_SVC_NEW_PSW # reenable interrupts
25d83cbf 586 brasl %r14,schedule # call scheduler
c5328901 587 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
411788ea 588 TRACE_IRQS_OFF
6a2df3a8 589 j io_return
1da177e4
LT		 590
591#
02a029b3 592# _TIF_SIGPENDING or is set, call do_signal
1da177e4 593#
25d83cbf 594io_sigpending:
6a2df3a8 595 # TRACE_IRQS_ON already done at io_return
c5328901
MS		 596 ssm __LC_SVC_NEW_PSW # reenable interrupts
597 lgr %r2,%r11 # pass pointer to pt_regs
598 brasl %r14,do_signal
599 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
411788ea 600 TRACE_IRQS_OFF
6a2df3a8 601 j io_return
1da177e4 602
753c4dd6
MS		 603#
604# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
605#
606io_notify_resume:
6a2df3a8 607 # TRACE_IRQS_ON already done at io_return
c5328901
MS		 608 ssm __LC_SVC_NEW_PSW # reenable interrupts
609 lgr %r2,%r11 # pass pointer to pt_regs
610 brasl %r14,do_notify_resume
611 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
753c4dd6 612 TRACE_IRQS_OFF
6a2df3a8 613 j io_return
753c4dd6 614
1da177e4
LT		 615/*
616 * External interrupt handler routine
617 */
144d634a 618ENTRY(ext_int_handler)
473e66ba 619 STCK __LC_INT_CLOCK
9cfb9b3c 620 stpt __LC_ASYNC_ENTER_TIMER
c5328901
MS		 621 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
622 lg %r10,__LC_LAST_BREAK
623 lg %r12,__LC_THREAD_INFO
624 larl %r13,system_call
625 lmg %r8,%r9,__LC_EXT_OLD_PSW
626 HANDLE_SIE_INTERCEPT %r14
627 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
628 tmhh %r8,0x0001 # interrupting from user ?
629 jz ext_skip
630 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
631 LAST_BREAK %r14
632ext_skip:
633 stmg %r0,%r7,__PT_R0(%r11)
634 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
635 stmg %r8,%r9,__PT_PSW(%r11)
1f194a4c 636 TRACE_IRQS_OFF
0de9db37 637 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
f6649a7e 638 lghi %r1,4096
c5328901 639 lgr %r2,%r11 # pass pointer to pt_regs
7e180bd8 640 llgf %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code
f6649a7e
MS		 641 llgf %r4,__LC_EXT_PARAMS # get external parameter
642 lg %r5,__LC_EXT_PARAMS2-4096(%r1) # get 64 bit external parameter
25d83cbf 643 brasl %r14,do_extint
1da177e4
LT		 644 j io_return
645
4c1051e3
MS		 646/*
647 * Load idle PSW. The second "half" of this function is in cleanup_idle.
648 */
649ENTRY(psw_idle)
27f6b416 650 stg %r3,__SF_EMPTY(%r15)
4c1051e3
MS		 651 larl %r1,psw_idle_lpsw+4
652 stg %r1,__SF_EMPTY+8(%r15)
27f6b416
MS		 653 STCK __CLOCK_IDLE_ENTER(%r2)
654 stpt __TIMER_IDLE_ENTER(%r2)
4c1051e3
MS		 655psw_idle_lpsw:
656 lpswe __SF_EMPTY(%r15)
657 br %r14
658psw_idle_end:
659
ae6aa2ea
MS		 660__critical_end:
661
1da177e4
LT		 662/*
663 * Machine check handler routines
664 */
144d634a 665ENTRY(mcck_int_handler)
473e66ba 666 STCK __LC_MCCK_CLOCK
77fa2245
HC		 667 la %r1,4095 # revalidate r1
668 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
25d83cbf 669 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
c5328901
MS		 670 lg %r10,__LC_LAST_BREAK
671 lg %r12,__LC_THREAD_INFO
86f2552b 672 larl %r13,system_call
c5328901
MS		 673 lmg %r8,%r9,__LC_MCK_OLD_PSW
674 HANDLE_SIE_INTERCEPT %r14
25d83cbf 675 tm __LC_MCCK_CODE,0x80 # system damage?
c5328901
MS		 676 jo mcck_panic # yes -> rest of mcck code invalid
677 lghi %r14,__LC_CPU_TIMER_SAVE_AREA
678 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
63b12246 679 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
c5328901 680 jo 3f
63b12246
MS		 681 la %r14,__LC_SYNC_ENTER_TIMER
682 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
683 jl 0f
684 la %r14,__LC_ASYNC_ENTER_TIMER
6850: clc 0(8,%r14),__LC_EXIT_TIMER
c5328901 686 jl 1f
63b12246 687 la %r14,__LC_EXIT_TIMER
c5328901
MS		 6881: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
689 jl 2f
63b12246 690 la %r14,__LC_LAST_UPDATE_TIMER
c5328901 6912: spt 0(%r14)
6377981f 692 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
c5328901
MS		 6933: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
694 jno mcck_panic # no -> skip cleanup critical
695 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT
696 tm %r8,0x0001 # interrupting from user ?
697 jz mcck_skip
698 UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER
699 LAST_BREAK %r14
700mcck_skip:
701 lghi %r14,__LC_GPREGS_SAVE_AREA
702 mvc __PT_R0(128,%r11),0(%r14)
703 stmg %r8,%r9,__PT_PSW(%r11)
704 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
705 lgr %r2,%r11 # pass pointer to pt_regs
77fa2245 706 brasl %r14,s390_do_machine_check
c5328901 707 tm __PT_PSW+1(%r11),0x01 # returning to user ?
77fa2245
HC		 708 jno mcck_return
709 lg %r1,__LC_KERNEL_STACK # switch to kernel stack
c5328901
MS		 710 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
711 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
712 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
713 la %r11,STACK_FRAME_OVERHEAD(%r1)
77fa2245 714 lgr %r15,%r1
c5328901 715 ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off
86f2552b 716 tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
77fa2245 717 jno mcck_return
1f194a4c 718 TRACE_IRQS_OFF
77fa2245 719 brasl %r14,s390_handle_mcck
1f194a4c 720 TRACE_IRQS_ON
1da177e4 721mcck_return:
c5328901
MS		 722 lg %r14,__LC_VDSO_PER_CPU
723 lmg %r0,%r10,__PT_R0(%r11)
724 mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
63b12246
MS		 725 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
726 jno 0f
727 stpt __LC_EXIT_TIMER
c5328901
MS		 728 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
7290: lmg %r11,%r15,__PT_R11(%r11)
730 lpswe __LC_RETURN_MCCK_PSW
731
732mcck_panic:
733 lg %r14,__LC_PANIC_STACK
734 slgr %r14,%r15
735 srag %r14,%r14,PAGE_SHIFT
736 jz 0f
737 lg %r15,__LC_PANIC_STACK
7380: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
739 j mcck_skip
1da177e4 740
7dd6b334
MH		 741#
742# PSW restart interrupt handler
743#
8b646bd7 744ENTRY(restart_int_handler)
c5328901 745 stg %r15,__LC_SAVE_AREA_RESTART
8b646bd7 746 lg %r15,__LC_RESTART_STACK
c5328901 747 aghi %r15,-__PT_SIZE # create pt_regs on stack
8b646bd7 748 xc 0(__PT_SIZE,%r15),0(%r15)
c5328901
MS		 749 stmg %r0,%r14,__PT_R0(%r15)
750 mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
751 mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw
8b646bd7
MS		 752 aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack
753 xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
fbe76568
HC		 754 lg %r1,__LC_RESTART_FN # load fn, parm & source cpu
755 lg %r2,__LC_RESTART_DATA
756 lg %r3,__LC_RESTART_SOURCE
8b646bd7
MS		 757 ltgr %r3,%r3 # test source cpu address
758 jm 1f # negative -> skip source stop
eb546195 7590: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu
8b646bd7
MS		 760 brc 10,0b # wait for status stored
7611: basr %r14,%r1 # call function
762 stap __SF_EMPTY(%r15) # store cpu address
763 llgh %r3,__SF_EMPTY(%r15)
eb546195 7642: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu
8b646bd7
MS		 765 brc 2,2b
7663: j 3b
7dd6b334 767
860dba45
MS		 768 .section .kprobes.text, "ax"
769
1da177e4
LT		 770#ifdef CONFIG_CHECK_STACK
771/*
772 * The synchronous or the asynchronous stack overflowed. We are dead.
773 * No need to properly save the registers, we are going to panic anyway.
774 * Setup a pt_regs so that show_trace can provide a good call trace.
775 */
776stack_overflow:
c5328901
MS		 777 lg %r11,__LC_PANIC_STACK # change to panic stack
778 aghi %r11,-__PT_SIZE # create pt_regs
779 stmg %r0,%r7,__PT_R0(%r11)
780 stmg %r8,%r9,__PT_PSW(%r11)
781 mvc __PT_R8(64,%r11),0(%r14)
782 stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2
783 lgr %r15,%r11
784 aghi %r15,-STACK_FRAME_OVERHEAD
785 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
786 lgr %r2,%r11 # pass pointer to pt_regs
1da177e4
LT		 787 jg kernel_stack_overflow
788#endif
789
c5328901
MS		 790 .align 8
791cleanup_table:
792 .quad system_call
793 .quad sysc_do_svc
794 .quad sysc_tif
795 .quad sysc_restore
796 .quad sysc_done
797 .quad io_tif
798 .quad io_restore
799 .quad io_done
4c1051e3
MS		 800 .quad psw_idle
801 .quad psw_idle_end
1da177e4
LT		 802
803cleanup_critical:
c5328901 804 clg %r9,BASED(cleanup_table) # system_call
1da177e4 805 jl 0f
c5328901 806 clg %r9,BASED(cleanup_table+8) # sysc_do_svc
1da177e4 807 jl cleanup_system_call
c5328901 808 clg %r9,BASED(cleanup_table+16) # sysc_tif
1da177e4 809 jl 0f
c5328901 810 clg %r9,BASED(cleanup_table+24) # sysc_restore
6a2df3a8 811 jl cleanup_sysc_tif
c5328901 812 clg %r9,BASED(cleanup_table+32) # sysc_done
6a2df3a8 813 jl cleanup_sysc_restore
c5328901 814 clg %r9,BASED(cleanup_table+40) # io_tif
63b12246 815 jl 0f
c5328901 816 clg %r9,BASED(cleanup_table+48) # io_restore
6a2df3a8 817 jl cleanup_io_tif
c5328901 818 clg %r9,BASED(cleanup_table+56) # io_done
6a2df3a8 819 jl cleanup_io_restore
4c1051e3
MS		 820 clg %r9,BASED(cleanup_table+64) # psw_idle
821 jl 0f
822 clg %r9,BASED(cleanup_table+72) # psw_idle_end
823 jl cleanup_idle
c5328901
MS		 8240: br %r14
825
1da177e4
LT		 826
827cleanup_system_call:
c5328901
MS		 828 # check if stpt has been executed
829 clg %r9,BASED(cleanup_system_call_insn)
1da177e4
LT		 830 jh 0f
831 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
c5328901 832 cghi %r11,__LC_SAVE_AREA_ASYNC
6377981f 833 je 0f
c5328901
MS		 834 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
8350: # check if stmg has been executed
836 clg %r9,BASED(cleanup_system_call_insn+8)
1da177e4 837 jh 0f
c5328901
MS		 838 mvc __LC_SAVE_AREA_SYNC(64),0(%r11)
8390: # check if base register setup + TIF bit load has been done
840 clg %r9,BASED(cleanup_system_call_insn+16)
841 jhe 0f
842 # set up saved registers r10 and r12
843 stg %r10,16(%r11) # r10 last break
844 stg %r12,32(%r11) # r12 thread-info pointer
8450: # check if the user time update has been done
846 clg %r9,BASED(cleanup_system_call_insn+24)
847 jh 0f
848 lg %r15,__LC_EXIT_TIMER
849 slg %r15,__LC_SYNC_ENTER_TIMER
850 alg %r15,__LC_USER_TIMER
851 stg %r15,__LC_USER_TIMER
8520: # check if the system time update has been done
853 clg %r9,BASED(cleanup_system_call_insn+32)
854 jh 0f
855 lg %r15,__LC_LAST_UPDATE_TIMER
856 slg %r15,__LC_EXIT_TIMER
857 alg %r15,__LC_SYSTEM_TIMER
858 stg %r15,__LC_SYSTEM_TIMER
8590: # update accounting time stamp
1da177e4 860 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
c5328901
MS		 861 # do LAST_BREAK
862 lg %r9,16(%r11)
863 srag %r9,%r9,23
86f2552b 864 jz 0f
c5328901
MS		 865 mvc __TI_last_break(8,%r12),16(%r11)
8660: # set up saved register r11
867 lg %r15,__LC_KERNEL_STACK
868 aghi %r15,-__PT_SIZE
869 stg %r15,24(%r11) # r11 pt_regs pointer
870 # fill pt_regs
871 mvc __PT_R8(64,%r15),__LC_SAVE_AREA_SYNC
872 stmg %r0,%r7,__PT_R0(%r15)
873 mvc __PT_PSW(16,%r15),__LC_SVC_OLD_PSW
aa33c8cb 874 mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC
c5328901
MS		 875 # setup saved register r15
876 aghi %r15,-STACK_FRAME_OVERHEAD
877 stg %r15,56(%r11) # r15 stack pointer
878 # set new psw address and exit
879 larl %r9,sysc_do_svc
1da177e4
LT		 880 br %r14
881cleanup_system_call_insn:
25d83cbf 882 .quad system_call
c5328901
MS		 883 .quad sysc_stmg
884 .quad sysc_per
885 .quad sysc_vtime+18
886 .quad sysc_vtime+42
1da177e4 887
6a2df3a8 888cleanup_sysc_tif:
c5328901 889 larl %r9,sysc_tif
1da177e4
LT		 890 br %r14
891
6a2df3a8 892cleanup_sysc_restore:
c5328901 893 clg %r9,BASED(cleanup_sysc_restore_insn)
6377981f 894 je 0f
c5328901
MS		 895 lg %r9,24(%r11) # get saved pointer to pt_regs
896 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
897 mvc 0(64,%r11),__PT_R8(%r9)
898 lmg %r0,%r7,__PT_R0(%r9)
8990: lmg %r8,%r9,__LC_RETURN_PSW
1da177e4 900 br %r14
6a2df3a8 901cleanup_sysc_restore_insn:
411788ea 902 .quad sysc_done - 4
1da177e4 903
6a2df3a8 904cleanup_io_tif:
c5328901 905 larl %r9,io_tif
176b1803
MS		 906 br %r14
907
6a2df3a8 908cleanup_io_restore:
c5328901
MS		 909 clg %r9,BASED(cleanup_io_restore_insn)
910 je 0f
911 lg %r9,24(%r11) # get saved r11 pointer to pt_regs
912 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
c5328901
MS		 913 mvc 0(64,%r11),__PT_R8(%r9)
914 lmg %r0,%r7,__PT_R0(%r9)
9150: lmg %r8,%r9,__LC_RETURN_PSW
ae6aa2ea 916 br %r14
6a2df3a8 917cleanup_io_restore_insn:
411788ea 918 .quad io_done - 4
ae6aa2ea 919
4c1051e3
MS		 920cleanup_idle:
921 # copy interrupt clock & cpu timer
27f6b416
MS		 922 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK
923 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER
4c1051e3
MS		 924 cghi %r11,__LC_SAVE_AREA_ASYNC
925 je 0f
27f6b416
MS		 926 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
927 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER
4c1051e3
MS		 9280: # check if stck & stpt have been executed
929 clg %r9,BASED(cleanup_idle_insn)
930 jhe 1f
27f6b416
MS		 931 mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
932 mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
9331: # account system time going idle
4c1051e3 934 lg %r9,__LC_STEAL_TIMER
27f6b416 935 alg %r9,__CLOCK_IDLE_ENTER(%r2)
4c1051e3
MS		 936 slg %r9,__LC_LAST_UPDATE_CLOCK
937 stg %r9,__LC_STEAL_TIMER
27f6b416 938 mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
4c1051e3
MS		 939 lg %r9,__LC_SYSTEM_TIMER
940 alg %r9,__LC_LAST_UPDATE_TIMER
27f6b416 941 slg %r9,__TIMER_IDLE_ENTER(%r2)
4c1051e3 942 stg %r9,__LC_SYSTEM_TIMER
27f6b416 943 mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
4c1051e3
MS		 944 # prepare return psw
945 nihh %r8,0xfffd # clear wait state bit
946 lg %r9,48(%r11) # return from psw_idle
947 br %r14
948cleanup_idle_insn:
949 .quad psw_idle_lpsw
950
1da177e4
LT		 951/*
952 * Integer constants
953 */
c5328901 954 .align 8
1da177e4 955.Lcritical_start:
c5328901
MS		 956 .quad __critical_start
957.Lcritical_length:
958 .quad __critical_end - __critical_start
959
1da177e4 960
603d1a50
MS		 961#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
962/*
963 * sie64a calling convention:
964 * %r2 pointer to sie control block
965 * %r3 guest register save area
966 */
144d634a 967ENTRY(sie64a)
603d1a50
MS		 968 stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers
969 stg %r2,__SF_EMPTY(%r15) # save control block pointer
970 stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
ddd6f953 971 xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # host id == 0
603d1a50 972 lmg %r0,%r13,0(%r3) # load guest gprs 0-13
603d1a50
MS		 973sie_loop:
974 lg %r14,__LC_THREAD_INFO # pointer thread_info struct
975 tm __TI_flags+7(%r14),_TIF_EXIT_SIE
976 jnz sie_exit
480e5926
CB		 977 lg %r14,__LC_GMAP # get gmap pointer
978 ltgr %r14,%r14
979 jz sie_gmap
980 lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce
981sie_gmap:
603d1a50
MS		 982 lg %r14,__SF_EMPTY(%r15) # get control block pointer
983 SPP __SF_EMPTY(%r15) # set guest id
984 sie 0(%r14)
985sie_done:
ddd6f953 986 SPP __SF_EMPTY+16(%r15) # set host id
603d1a50
MS		 987 lg %r14,__LC_THREAD_INFO # pointer thread_info struct
988sie_exit:
480e5926 989 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
603d1a50
MS		 990 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
991 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
992 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
993 lghi %r2,0
994 br %r14
995sie_fault:
69ba9743 996 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
603d1a50 997 lg %r14,__LC_THREAD_INFO # pointer thread_info struct
603d1a50
MS		 998 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
999 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
1000 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
1001 lghi %r2,-EFAULT
1002 br %r14
1003
1004 .align 8
1005.Lsie_loop:
1006 .quad sie_loop
c5328901
MS		 1007.Lsie_length:
1008 .quad sie_done - sie_loop
ddd6f953
MS		 1009.Lhost_id:
1010 .quad 0
603d1a50 1011
eb608fb3 1012 EX_TABLE(sie_loop,sie_fault)
603d1a50
MS		 1013#endif
1014
25d83cbf 1015 .section .rodata, "a"
1da177e4 1016#define SYSCALL(esa,esame,emu) .long esame
9bf1226b 1017 .globl sys_call_table
1da177e4
LT		 1018sys_call_table:
1019#include "syscalls.S"
1020#undef SYSCALL
1021
347a8dc3 1022#ifdef CONFIG_COMPAT
1da177e4
LT		 1023
1024#define SYSCALL(esa,esame,emu) .long emu
1da177e4
LT		 1025sys_call_table_emu:
1026#include "syscalls.S"
1027#undef SYSCALL
1028#endif
kernel source for telekom puls (alcatel/mediatek)