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[S390] rework smp code
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / s390 / kernel / entry64.S
CommitLineData
1da177e4 1/*
54dfe5dd 2 * arch/s390/kernel/entry64.S
1da177e4
LT		 3 * S390 low-level entry points.
4 *
8b646bd7 5 * Copyright (C) IBM Corp. 1999,2012
1da177e4 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
25d83cbf
HC		 7 * Hartmut Penner (hp@de.ibm.com),
8 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
77fa2245 9 * Heiko Carstens <heiko.carstens@de.ibm.com>
1da177e4
LT		 10 */
11
2bc89b5e 12#include <linux/init.h>
144d634a 13#include <linux/linkage.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>
21
c5328901
MS		 22__PT_R0 = __PT_GPRS
23__PT_R1 = __PT_GPRS + 8
24__PT_R2 = __PT_GPRS + 16
25__PT_R3 = __PT_GPRS + 24
26__PT_R4 = __PT_GPRS + 32
27__PT_R5 = __PT_GPRS + 40
28__PT_R6 = __PT_GPRS + 48
29__PT_R7 = __PT_GPRS + 56
30__PT_R8 = __PT_GPRS + 64
31__PT_R9 = __PT_GPRS + 72
32__PT_R10 = __PT_GPRS + 80
33__PT_R11 = __PT_GPRS + 88
34__PT_R12 = __PT_GPRS + 96
35__PT_R13 = __PT_GPRS + 104
36__PT_R14 = __PT_GPRS + 112
37__PT_R15 = __PT_GPRS + 120
1da177e4
LT		 38
39STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
40STACK_SIZE = 1 << STACK_SHIFT
41
753c4dd6 42_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
b6ef5bb3 43 _TIF_MCCK_PENDING | _TIF_PER_TRAP )
753c4dd6 44_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
54dfe5dd 45 _TIF_MCCK_PENDING)
b6ef5bb3
MS		 46_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
47 _TIF_SYSCALL_TRACEPOINT)
603d1a50 48_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
1da177e4
LT		 49
50#define BASED(name) name-system_call(%r13)
51
1f194a4c 52 .macro TRACE_IRQS_ON
c5328901 53#ifdef CONFIG_TRACE_IRQFLAGS
6a2df3a8
MS		 54 basr %r2,%r0
55 brasl %r14,trace_hardirqs_on_caller
c5328901 56#endif
1f194a4c
HC		 57 .endm
58
59 .macro TRACE_IRQS_OFF
c5328901 60#ifdef CONFIG_TRACE_IRQFLAGS
6a2df3a8
MS		 61 basr %r2,%r0
62 brasl %r14,trace_hardirqs_off_caller
411788ea 63#endif
c5328901 64 .endm
411788ea 65
411788ea 66 .macro LOCKDEP_SYS_EXIT
c5328901
MS		 67#ifdef CONFIG_LOCKDEP
68 tm __PT_PSW+1(%r11),0x01 # returning to user ?
69 jz .+10
411788ea 70 brasl %r14,lockdep_sys_exit
1f194a4c 71#endif
1da177e4 72 .endm
1da177e4 73
c5328901
MS		 74 .macro SPP newpp
75#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
76 tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP
77 jz .+8
78 .insn s,0xb2800000,\newpp
79#endif
80 .endm
1da177e4 81
c5328901
MS		 82 .macro HANDLE_SIE_INTERCEPT scratch
83#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
84 tm __TI_flags+6(%r12),_TIF_SIE>>8
85 jz .+42
86 tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP
87 jz .+8
88 .insn s,0xb2800000,BASED(.Lhost_id) # set host id
89 lgr \scratch,%r9
90 slg \scratch,BASED(.Lsie_loop)
91 clg \scratch,BASED(.Lsie_length)
92 jhe .+10
93 lg %r9,BASED(.Lsie_loop)
94#endif
987ad70a
MS		 95 .endm
96
c5328901 97 .macro CHECK_STACK stacksize,savearea
63b12246 98#ifdef CONFIG_CHECK_STACK
c5328901
MS		 99 tml %r15,\stacksize - CONFIG_STACK_GUARD
100 lghi %r14,\savearea
101 jz stack_overflow
63b12246 102#endif
63b12246
MS		 103 .endm
104
c5328901
MS		 105 .macro SWITCH_ASYNC savearea,stack,shift
106 tmhh %r8,0x0001 # interrupting from user ?
107 jnz 1f
108 lgr %r14,%r9
109 slg %r14,BASED(.Lcritical_start)
110 clg %r14,BASED(.Lcritical_length)
1da177e4 111 jhe 0f
c5328901 112 lghi %r11,\savearea # inside critical section, do cleanup
1da177e4 113 brasl %r14,cleanup_critical
c5328901 114 tmhh %r8,0x0001 # retest problem state after cleanup
1da177e4 115 jnz 1f
c5328901 1160: lg %r14,\stack # are we already on the target stack?
1da177e4 117 slgr %r14,%r15
c5328901 118 srag %r14,%r14,\shift
86f2552b 119 jnz 1f
c5328901
MS		 120 CHECK_STACK 1<<\shift,\savearea
121 j 2f
1221: lg %r15,\stack # load target stack
1232: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
124 la %r11,STACK_FRAME_OVERHEAD(%r15)
25d83cbf 125 .endm
1da177e4 126
c5328901
MS		 127 .macro UPDATE_VTIME scratch,enter_timer
128 lg \scratch,__LC_EXIT_TIMER
129 slg \scratch,\enter_timer
130 alg \scratch,__LC_USER_TIMER
131 stg \scratch,__LC_USER_TIMER
132 lg \scratch,__LC_LAST_UPDATE_TIMER
133 slg \scratch,__LC_EXIT_TIMER
134 alg \scratch,__LC_SYSTEM_TIMER
135 stg \scratch,__LC_SYSTEM_TIMER
136 mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer
1da177e4
LT		 137 .endm
138
c5328901
MS		 139 .macro LAST_BREAK scratch
140 srag \scratch,%r10,23
141 jz .+10
142 stg %r10,__TI_last_break(%r12)
86f2552b
MS		 143 .endm
144
1e54622e 145 .macro REENABLE_IRQS
c5328901
MS		 146 stg %r8,__LC_RETURN_PSW
147 ni __LC_RETURN_PSW,0xbf
148 ssm __LC_RETURN_PSW
1e54622e
MS		 149 .endm
150
860dba45
MS		 151 .section .kprobes.text, "ax"
152
1da177e4
LT		 153/*
154 * Scheduler resume function, called by switch_to
155 * gpr2 = (task_struct *) prev
156 * gpr3 = (task_struct *) next
157 * Returns:
158 * gpr2 = prev
159 */
144d634a 160ENTRY(__switch_to)
5e9a2692
MS		 161 lg %r4,__THREAD_info(%r2) # get thread_info of prev
162 lg %r5,__THREAD_info(%r3) # get thread_info of next
77fa2245 163 tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
5e9a2692
MS		 164 jz 0f
165 ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
166 oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next
1670: stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
168 stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev
169 lg %r15,__THREAD_ksp(%r3) # load kernel stack of next
170 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
171 lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
172 stg %r3,__LC_CURRENT # store task struct of next
f2db2e6c 173 mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
5e9a2692
MS		 174 stg %r5,__LC_THREAD_INFO # store thread info of next
175 aghi %r5,STACK_SIZE # end of kernel stack of next
176 stg %r5,__LC_KERNEL_STACK # store end of kernel stack
1da177e4
LT		 177 br %r14
178
179__critical_start:
180/*
181 * SVC interrupt handler routine. System calls are synchronous events and
182 * are executed with interrupts enabled.
183 */
184
144d634a 185ENTRY(system_call)
c185b783 186 stpt __LC_SYNC_ENTER_TIMER
c5328901
MS		 187sysc_stmg:
188 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
189 lg %r10,__LC_LAST_BREAK
190 lg %r12,__LC_THREAD_INFO
191 larl %r13,system_call
192sysc_per:
193 lg %r15,__LC_KERNEL_STACK
194 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
195 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
1da177e4 196sysc_vtime:
c5328901
MS		 197 UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER
198 LAST_BREAK %r13
199 stmg %r0,%r7,__PT_R0(%r11)
200 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
201 mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
aa33c8cb 202 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
1da177e4 203sysc_do_svc:
c5328901 204 oi __TI_flags+7(%r12),_TIF_SYSCALL
aa33c8cb 205 llgh %r8,__PT_INT_CODE+2(%r11)
c5328901 206 slag %r8,%r8,2 # shift and test for svc 0
1da177e4
LT		 207 jnz sysc_nr_ok
208 # svc 0: system call number in %r1
c5328901 209 llgfr %r1,%r1 # clear high word in r1
86f2552b 210 cghi %r1,NR_syscalls
1da177e4 211 jnl sysc_nr_ok
aa33c8cb 212 sth %r1,__PT_INT_CODE+2(%r11)
c5328901 213 slag %r8,%r1,2
1da177e4 214sysc_nr_ok:
c5328901 215 larl %r10,sys_call_table # 64 bit system call table
347a8dc3 216#ifdef CONFIG_COMPAT
c5328901 217 tm __TI_flags+5(%r12),(_TIF_31BIT>>16)
c563077e 218 jno sysc_noemu
c5328901 219 larl %r10,sys_call_table_emu # 31 bit system call table
1da177e4
LT		 220sysc_noemu:
221#endif
c5328901
MS		 222 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
223 stg %r2,__PT_ORIG_GPR2(%r11)
224 stg %r7,STACK_FRAME_OVERHEAD(%r15)
225 lgf %r9,0(%r8,%r10) # get system call add.
b6ef5bb3 226 tm __TI_flags+6(%r12),_TIF_TRACE >> 8
25d83cbf 227 jnz sysc_tracesys
c5328901
MS		 228 basr %r14,%r9 # call sys_xxxx
229 stg %r2,__PT_R2(%r11) # store return value
1da177e4
LT		 230
231sysc_return:
6a2df3a8
MS		 232 LOCKDEP_SYS_EXIT
233sysc_tif:
c5328901 234 tm __PT_PSW+1(%r11),0x01 # returning to user ?
b6ef5bb3 235 jno sysc_restore
86f2552b 236 tm __TI_flags+7(%r12),_TIF_WORK_SVC
c5328901 237 jnz sysc_work # check for work
b6ef5bb3 238 ni __TI_flags+7(%r12),255-_TIF_SYSCALL
411788ea 239sysc_restore:
c5328901
MS		 240 lg %r14,__LC_VDSO_PER_CPU
241 lmg %r0,%r10,__PT_R0(%r11)
242 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
243 stpt __LC_EXIT_TIMER
244 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
245 lmg %r11,%r15,__PT_R11(%r11)
246 lpswe __LC_RETURN_PSW
411788ea
HC		 247sysc_done:
248
43d399d2
MS		 249#
250# One of the work bits is on. Find out which one.
251#
b6ef5bb3 252sysc_work:
86f2552b 253 tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
77fa2245 254 jo sysc_mcck_pending
86f2552b 255 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
1da177e4 256 jo sysc_reschedule
86f2552b 257 tm __TI_flags+7(%r12),_TIF_SIGPENDING
43d399d2 258 jo sysc_sigpending
86f2552b 259 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
43d399d2 260 jo sysc_notify_resume
5e9a2692 261 tm __TI_flags+7(%r12),_TIF_PER_TRAP
1da177e4 262 jo sysc_singlestep
43d399d2 263 j sysc_return # beware of critical section cleanup
1da177e4
LT		 264
265#
266# _TIF_NEED_RESCHED is set, call schedule
25d83cbf
HC		 267#
268sysc_reschedule:
6a2df3a8 269 larl %r14,sysc_return
c5328901 270 jg schedule
1da177e4 271
77fa2245
HC		 272#
273# _TIF_MCCK_PENDING is set, call handler
274#
275sysc_mcck_pending:
6a2df3a8 276 larl %r14,sysc_return
25d83cbf 277 jg s390_handle_mcck # TIF bit will be cleared by handler
77fa2245 278
1da177e4 279#
02a029b3 280# _TIF_SIGPENDING is set, call do_signal
1da177e4 281#
25d83cbf 282sysc_sigpending:
5e9a2692 283 ni __TI_flags+7(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
c5328901
MS		 284 lgr %r2,%r11 # pass pointer to pt_regs
285 brasl %r14,do_signal
b6ef5bb3
MS		 286 tm __TI_flags+7(%r12),_TIF_SYSCALL
287 jno sysc_return
c5328901
MS		 288 lmg %r2,%r7,__PT_R2(%r11) # load svc arguments
289 lghi %r8,0 # svc 0 returns -ENOSYS
aa33c8cb 290 lh %r1,__PT_INT_CODE+2(%r11) # load new svc number
b6ef5bb3
MS		 291 cghi %r1,NR_syscalls
292 jnl sysc_nr_ok # invalid svc number -> do svc 0
c5328901 293 slag %r8,%r1,2
b6ef5bb3 294 j sysc_nr_ok # restart svc
1da177e4 295
753c4dd6
MS		 296#
297# _TIF_NOTIFY_RESUME is set, call do_notify_resume
298#
299sysc_notify_resume:
c5328901 300 lgr %r2,%r11 # pass pointer to pt_regs
6a2df3a8 301 larl %r14,sysc_return
c5328901 302 jg do_notify_resume
753c4dd6 303
1da177e4 304#
5e9a2692 305# _TIF_PER_TRAP is set, call do_per_trap
1da177e4
LT		 306#
307sysc_singlestep:
b6ef5bb3 308 ni __TI_flags+7(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP)
c5328901
MS		 309 lgr %r2,%r11 # pass pointer to pt_regs
310 larl %r14,sysc_return
5e9a2692 311 jg do_per_trap
1da177e4 312
1da177e4 313#
753c4dd6
MS		 314# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
315# and after the system call
1da177e4
LT		 316#
317sysc_tracesys:
c5328901 318 lgr %r2,%r11 # pass pointer to pt_regs
1da177e4 319 la %r3,0
aa33c8cb 320 llgh %r0,__PT_INT_CODE+2(%r11)
c5328901 321 stg %r0,__PT_R2(%r11)
753c4dd6 322 brasl %r14,do_syscall_trace_enter
1da177e4 323 lghi %r0,NR_syscalls
753c4dd6 324 clgr %r0,%r2
1da177e4 325 jnh sysc_tracenogo
c5328901
MS		 326 sllg %r8,%r2,2
327 lgf %r9,0(%r8,%r10)
1da177e4 328sysc_tracego:
c5328901
MS		 329 lmg %r3,%r7,__PT_R3(%r11)
330 stg %r7,STACK_FRAME_OVERHEAD(%r15)
331 lg %r2,__PT_ORIG_GPR2(%r11)
332 basr %r14,%r9 # call sys_xxx
333 stg %r2,__PT_R2(%r11) # store return value
1da177e4 334sysc_tracenogo:
b6ef5bb3 335 tm __TI_flags+6(%r12),_TIF_TRACE >> 8
25d83cbf 336 jz sysc_return
c5328901
MS		 337 lgr %r2,%r11 # pass pointer to pt_regs
338 larl %r14,sysc_return
753c4dd6 339 jg do_syscall_trace_exit
1da177e4
LT		 340
341#
342# a new process exits the kernel with ret_from_fork
343#
144d634a 344ENTRY(ret_from_fork)
c5328901
MS		 345 la %r11,STACK_FRAME_OVERHEAD(%r15)
346 lg %r12,__LC_THREAD_INFO
347 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
1da177e4 348 jo 0f
c5328901 349 stg %r15,__PT_R15(%r11) # store stack pointer for new kthread
25d83cbf 3500: brasl %r14,schedule_tail
1f194a4c 351 TRACE_IRQS_ON
c5328901 352 ssm __LC_SVC_NEW_PSW # reenable interrupts
8f2961c3 353 j sysc_tracenogo
1da177e4
LT		 354
355#
03ff9a23
MS		 356# kernel_execve function needs to deal with pt_regs that is not
357# at the usual place
1da177e4 358#
144d634a 359ENTRY(kernel_execve)
03ff9a23
MS		 360 stmg %r12,%r15,96(%r15)
361 lgr %r14,%r15
c5328901 362 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
03ff9a23 363 stg %r14,__SF_BACKCHAIN(%r15)
c5328901 364 la %r12,STACK_FRAME_OVERHEAD(%r15)
03ff9a23
MS		 365 xc 0(__PT_SIZE,%r12),0(%r12)
366 lgr %r5,%r12
367 brasl %r14,do_execve
368 ltgfr %r2,%r2
369 je 0f
c5328901 370 aghi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE)
03ff9a23
MS		 371 lmg %r12,%r15,96(%r15)
372 br %r14
373 # execve succeeded.
c5328901 3740: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
03ff9a23 375 lg %r15,__LC_KERNEL_STACK # load ksp
c5328901
MS		 376 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
377 la %r11,STACK_FRAME_OVERHEAD(%r15)
378 mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs
86f2552b 379 lg %r12,__LC_THREAD_INFO
03ff9a23 380 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
c5328901 381 ssm __LC_SVC_NEW_PSW # reenable interrupts
03ff9a23
MS		 382 brasl %r14,execve_tail
383 j sysc_return
1da177e4
LT		 384
385/*
386 * Program check handler routine
387 */
388
144d634a 389ENTRY(pgm_check_handler)
c185b783 390 stpt __LC_SYNC_ENTER_TIMER
c5328901
MS		 391 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
392 lg %r10,__LC_LAST_BREAK
393 lg %r12,__LC_THREAD_INFO
394 larl %r13,system_call
395 lmg %r8,%r9,__LC_PGM_OLD_PSW
396 HANDLE_SIE_INTERCEPT %r14
397 tmhh %r8,0x0001 # test problem state bit
398 jnz 1f # -> fault in user space
399 tmhh %r8,0x4000 # PER bit set in old PSW ?
400 jnz 0f # -> enabled, can't be a double fault
401 tm __LC_PGM_ILC+3,0x80 # check for per exception
402 jnz pgm_svcper # -> single stepped svc
4030: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
404 j 2f
4051: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER
406 LAST_BREAK %r14
407 lg %r15,__LC_KERNEL_STACK
4082: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
409 la %r11,STACK_FRAME_OVERHEAD(%r15)
410 stmg %r0,%r7,__PT_R0(%r11)
411 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
412 stmg %r8,%r9,__PT_PSW(%r11)
aa33c8cb
MS		 413 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
414 mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
c5328901
MS		 415 stg %r10,__PT_ARGS(%r11)
416 tm __LC_PGM_ILC+3,0x80 # check for per exception
417 jz 0f
86f2552b 418 lg %r1,__TI_task(%r12)
c5328901
MS		 419 tmhh %r8,0x0001 # kernel per event ?
420 jz pgm_kprobe
421 oi __TI_flags+7(%r12),_TIF_PER_TRAP
5e9a2692 422 mvc __THREAD_per_address(8,%r1),__LC_PER_ADDRESS
c5328901 423 mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE
5e9a2692 424 mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID
aa33c8cb 4250: REENABLE_IRQS
c5328901 426 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
f5cdac27 427 larl %r1,pgm_check_table
aa33c8cb
MS		 428 llgh %r10,__PT_INT_CODE+2(%r11)
429 nill %r10,0x007f
430 sll %r10,3
431 je sysc_return
c5328901
MS		 432 lg %r1,0(%r10,%r1) # load address of handler routine
433 lgr %r2,%r11 # pass pointer to pt_regs
f5cdac27 434 basr %r14,%r1 # branch to interrupt-handler
f5cdac27 435 j sysc_return
1da177e4
LT		 436
437#
c5328901 438# PER event in supervisor state, must be kprobes
1da177e4 439#
c5328901
MS		 440pgm_kprobe:
441 REENABLE_IRQS
442 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
443 lgr %r2,%r11 # pass pointer to pt_regs
444 brasl %r14,do_per_trap
445 j sysc_return
1da177e4 446
4ba069b8 447#
c5328901 448# single stepped system call
4ba069b8 449#
c5328901
MS		 450pgm_svcper:
451 oi __TI_flags+7(%r12),_TIF_PER_TRAP
452 mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
453 larl %r14,sysc_per
454 stg %r14,__LC_RETURN_PSW+8
455 lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs
4ba069b8 456
1da177e4
LT		 457/*
458 * IO interrupt handler routine
459 */
144d634a 460ENTRY(io_int_handler)
1da177e4 461 stck __LC_INT_CLOCK
9cfb9b3c 462 stpt __LC_ASYNC_ENTER_TIMER
c5328901
MS		 463 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
464 lg %r10,__LC_LAST_BREAK
465 lg %r12,__LC_THREAD_INFO
466 larl %r13,system_call
467 lmg %r8,%r9,__LC_IO_OLD_PSW
468 HANDLE_SIE_INTERCEPT %r14
469 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
470 tmhh %r8,0x0001 # interrupting from user?
471 jz io_skip
472 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
473 LAST_BREAK %r14
474io_skip:
475 stmg %r0,%r7,__PT_R0(%r11)
476 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
477 stmg %r8,%r9,__PT_PSW(%r11)
1f194a4c 478 TRACE_IRQS_OFF
c5328901
MS		 479 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
480 lgr %r2,%r11 # pass pointer to pt_regs
481 brasl %r14,do_IRQ
1da177e4 482io_return:
6a2df3a8
MS		 483 LOCKDEP_SYS_EXIT
484 TRACE_IRQS_ON
485io_tif:
86f2552b 486 tm __TI_flags+7(%r12),_TIF_WORK_INT
25d83cbf 487 jnz io_work # there is work to do (signals etc.)
411788ea 488io_restore:
c5328901
MS		 489 lg %r14,__LC_VDSO_PER_CPU
490 lmg %r0,%r10,__PT_R0(%r11)
491 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
492 ni __LC_RETURN_PSW+1,0xfd # clear wait state bit
493 stpt __LC_EXIT_TIMER
494 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
495 lmg %r11,%r15,__PT_R11(%r11)
496 lpswe __LC_RETURN_PSW
ae6aa2ea 497io_done:
1da177e4 498
2688905e 499#
43d399d2
MS		 500# There is work todo, find out in which context we have been interrupted:
501# 1) if we return to user space we can do all _TIF_WORK_INT work
502# 2) if we return to kernel code and kvm is enabled check if we need to
503# modify the psw to leave SIE
504# 3) if we return to kernel code and preemptive scheduling is enabled check
505# the preemption counter and if it is zero call preempt_schedule_irq
506# Before any work can be done, a switch to the kernel stack is required.
2688905e
MS		 507#
508io_work:
c5328901 509 tm __PT_PSW+1(%r11),0x01 # returning to user ?
43d399d2 510 jo io_work_user # yes -> do resched & signal
43d399d2 511#ifdef CONFIG_PREEMPT
2688905e 512 # check for preemptive scheduling
86f2552b 513 icm %r0,15,__TI_precount(%r12)
2688905e 514 jnz io_restore # preemption is disabled
6a2df3a8
MS		 515 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
516 jno io_restore
1da177e4 517 # switch to kernel stack
c5328901
MS		 518 lg %r1,__PT_R15(%r11)
519 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
520 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
521 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
522 la %r11,STACK_FRAME_OVERHEAD(%r1)
1da177e4 523 lgr %r15,%r1
6a2df3a8
MS		 524 # TRACE_IRQS_ON already done at io_return, call
525 # TRACE_IRQS_OFF to keep things symmetrical
526 TRACE_IRQS_OFF
527 brasl %r14,preempt_schedule_irq
528 j io_return
529#else
43d399d2 530 j io_restore
6a2df3a8 531#endif
1da177e4 532
43d399d2
MS		 533#
534# Need to do work before returning to userspace, switch to kernel stack
535#
2688905e 536io_work_user:
1da177e4 537 lg %r1,__LC_KERNEL_STACK
c5328901
MS		 538 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
539 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
540 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
541 la %r11,STACK_FRAME_OVERHEAD(%r1)
1da177e4 542 lgr %r15,%r1
43d399d2 543
1da177e4
LT		 544#
545# One of the work bits is on. Find out which one.
43d399d2 546# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED
54dfe5dd 547# and _TIF_MCCK_PENDING
1da177e4 548#
6a2df3a8 549io_work_tif:
86f2552b 550 tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
77fa2245 551 jo io_mcck_pending
86f2552b 552 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
1da177e4 553 jo io_reschedule
86f2552b 554 tm __TI_flags+7(%r12),_TIF_SIGPENDING
43d399d2 555 jo io_sigpending
86f2552b 556 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
43d399d2
MS		 557 jo io_notify_resume
558 j io_return # beware of critical section cleanup
0eaeafa1 559
77fa2245
HC		 560#
561# _TIF_MCCK_PENDING is set, call handler
562#
563io_mcck_pending:
6a2df3a8 564 # TRACE_IRQS_ON already done at io_return
b771aeac 565 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler
6a2df3a8
MS		 566 TRACE_IRQS_OFF
567 j io_return
77fa2245 568
1da177e4
LT		 569#
570# _TIF_NEED_RESCHED is set, call schedule
25d83cbf
HC		 571#
572io_reschedule:
6a2df3a8 573 # TRACE_IRQS_ON already done at io_return
c5328901 574 ssm __LC_SVC_NEW_PSW # reenable interrupts
25d83cbf 575 brasl %r14,schedule # call scheduler
c5328901 576 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
411788ea 577 TRACE_IRQS_OFF
6a2df3a8 578 j io_return
1da177e4
LT		 579
580#
02a029b3 581# _TIF_SIGPENDING or is set, call do_signal
1da177e4 582#
25d83cbf 583io_sigpending:
6a2df3a8 584 # TRACE_IRQS_ON already done at io_return
c5328901
MS		 585 ssm __LC_SVC_NEW_PSW # reenable interrupts
586 lgr %r2,%r11 # pass pointer to pt_regs
587 brasl %r14,do_signal
588 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
411788ea 589 TRACE_IRQS_OFF
6a2df3a8 590 j io_return
1da177e4 591
753c4dd6
MS		 592#
593# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
594#
595io_notify_resume:
6a2df3a8 596 # TRACE_IRQS_ON already done at io_return
c5328901
MS		 597 ssm __LC_SVC_NEW_PSW # reenable interrupts
598 lgr %r2,%r11 # pass pointer to pt_regs
599 brasl %r14,do_notify_resume
600 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
753c4dd6 601 TRACE_IRQS_OFF
6a2df3a8 602 j io_return
753c4dd6 603
1da177e4
LT		 604/*
605 * External interrupt handler routine
606 */
144d634a 607ENTRY(ext_int_handler)
1da177e4 608 stck __LC_INT_CLOCK
9cfb9b3c 609 stpt __LC_ASYNC_ENTER_TIMER
c5328901
MS		 610 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
611 lg %r10,__LC_LAST_BREAK
612 lg %r12,__LC_THREAD_INFO
613 larl %r13,system_call
614 lmg %r8,%r9,__LC_EXT_OLD_PSW
615 HANDLE_SIE_INTERCEPT %r14
616 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
617 tmhh %r8,0x0001 # interrupting from user ?
618 jz ext_skip
619 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
620 LAST_BREAK %r14
621ext_skip:
622 stmg %r0,%r7,__PT_R0(%r11)
623 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
624 stmg %r8,%r9,__PT_PSW(%r11)
1f194a4c 625 TRACE_IRQS_OFF
f6649a7e 626 lghi %r1,4096
c5328901 627 lgr %r2,%r11 # pass pointer to pt_regs
7e180bd8 628 llgf %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code
f6649a7e
MS		 629 llgf %r4,__LC_EXT_PARAMS # get external parameter
630 lg %r5,__LC_EXT_PARAMS2-4096(%r1) # get 64 bit external parameter
25d83cbf 631 brasl %r14,do_extint
1da177e4
LT		 632 j io_return
633
ae6aa2ea
MS		 634__critical_end:
635
1da177e4
LT		 636/*
637 * Machine check handler routines
638 */
144d634a 639ENTRY(mcck_int_handler)
6377981f 640 stck __LC_MCCK_CLOCK
77fa2245
HC		 641 la %r1,4095 # revalidate r1
642 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
25d83cbf 643 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
c5328901
MS		 644 lg %r10,__LC_LAST_BREAK
645 lg %r12,__LC_THREAD_INFO
86f2552b 646 larl %r13,system_call
c5328901
MS		 647 lmg %r8,%r9,__LC_MCK_OLD_PSW
648 HANDLE_SIE_INTERCEPT %r14
25d83cbf 649 tm __LC_MCCK_CODE,0x80 # system damage?
c5328901
MS		 650 jo mcck_panic # yes -> rest of mcck code invalid
651 lghi %r14,__LC_CPU_TIMER_SAVE_AREA
652 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
63b12246 653 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
c5328901 654 jo 3f
63b12246
MS		 655 la %r14,__LC_SYNC_ENTER_TIMER
656 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
657 jl 0f
658 la %r14,__LC_ASYNC_ENTER_TIMER
6590: clc 0(8,%r14),__LC_EXIT_TIMER
c5328901 660 jl 1f
63b12246 661 la %r14,__LC_EXIT_TIMER
c5328901
MS		 6621: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
663 jl 2f
63b12246 664 la %r14,__LC_LAST_UPDATE_TIMER
c5328901 6652: spt 0(%r14)
6377981f 666 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
c5328901
MS		 6673: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
668 jno mcck_panic # no -> skip cleanup critical
669 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT
670 tm %r8,0x0001 # interrupting from user ?
671 jz mcck_skip
672 UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER
673 LAST_BREAK %r14
674mcck_skip:
675 lghi %r14,__LC_GPREGS_SAVE_AREA
676 mvc __PT_R0(128,%r11),0(%r14)
677 stmg %r8,%r9,__PT_PSW(%r11)
678 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
679 lgr %r2,%r11 # pass pointer to pt_regs
77fa2245 680 brasl %r14,s390_do_machine_check
c5328901 681 tm __PT_PSW+1(%r11),0x01 # returning to user ?
77fa2245
HC		 682 jno mcck_return
683 lg %r1,__LC_KERNEL_STACK # switch to kernel stack
c5328901
MS		 684 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
685 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
686 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
687 la %r11,STACK_FRAME_OVERHEAD(%r1)
77fa2245 688 lgr %r15,%r1
c5328901 689 ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off
86f2552b 690 tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
77fa2245 691 jno mcck_return
1f194a4c 692 TRACE_IRQS_OFF
77fa2245 693 brasl %r14,s390_handle_mcck
1f194a4c 694 TRACE_IRQS_ON
1da177e4 695mcck_return:
c5328901
MS		 696 lg %r14,__LC_VDSO_PER_CPU
697 lmg %r0,%r10,__PT_R0(%r11)
698 mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
63b12246 699 ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
63b12246
MS		 700 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
701 jno 0f
702 stpt __LC_EXIT_TIMER
c5328901
MS		 703 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
7040: lmg %r11,%r15,__PT_R11(%r11)
705 lpswe __LC_RETURN_MCCK_PSW
706
707mcck_panic:
708 lg %r14,__LC_PANIC_STACK
709 slgr %r14,%r15
710 srag %r14,%r14,PAGE_SHIFT
711 jz 0f
712 lg %r15,__LC_PANIC_STACK
7130: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
714 j mcck_skip
1da177e4 715
7dd6b334
MH		 716#
717# PSW restart interrupt handler
718#
8b646bd7 719ENTRY(restart_int_handler)
c5328901 720 stg %r15,__LC_SAVE_AREA_RESTART
8b646bd7 721 lg %r15,__LC_RESTART_STACK
c5328901 722 aghi %r15,-__PT_SIZE # create pt_regs on stack
8b646bd7 723 xc 0(__PT_SIZE,%r15),0(%r15)
c5328901
MS		 724 stmg %r0,%r14,__PT_R0(%r15)
725 mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
726 mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw
8b646bd7
MS		 727 aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack
728 xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
729 lmg %r1,%r3,__LC_RESTART_FN # load fn, parm & source cpu
730 ltgr %r3,%r3 # test source cpu address
731 jm 1f # negative -> skip source stop
7320: sigp %r4,%r3,1 # sigp sense to source cpu
733 brc 10,0b # wait for status stored
7341: basr %r14,%r1 # call function
735 stap __SF_EMPTY(%r15) # store cpu address
736 llgh %r3,__SF_EMPTY(%r15)
7372: sigp %r4,%r3,5 # sigp stop to current cpu
738 brc 2,2b
7393: j 3b
7dd6b334 740
860dba45
MS		 741 .section .kprobes.text, "ax"
742
1da177e4
LT		 743#ifdef CONFIG_CHECK_STACK
744/*
745 * The synchronous or the asynchronous stack overflowed. We are dead.
746 * No need to properly save the registers, we are going to panic anyway.
747 * Setup a pt_regs so that show_trace can provide a good call trace.
748 */
749stack_overflow:
c5328901
MS		 750 lg %r11,__LC_PANIC_STACK # change to panic stack
751 aghi %r11,-__PT_SIZE # create pt_regs
752 stmg %r0,%r7,__PT_R0(%r11)
753 stmg %r8,%r9,__PT_PSW(%r11)
754 mvc __PT_R8(64,%r11),0(%r14)
755 stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2
756 lgr %r15,%r11
757 aghi %r15,-STACK_FRAME_OVERHEAD
758 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
759 lgr %r2,%r11 # pass pointer to pt_regs
1da177e4
LT		 760 jg kernel_stack_overflow
761#endif
762
c5328901
MS		 763 .align 8
764cleanup_table:
765 .quad system_call
766 .quad sysc_do_svc
767 .quad sysc_tif
768 .quad sysc_restore
769 .quad sysc_done
770 .quad io_tif
771 .quad io_restore
772 .quad io_done
1da177e4
LT		 773
774cleanup_critical:
c5328901 775 clg %r9,BASED(cleanup_table) # system_call
1da177e4 776 jl 0f
c5328901 777 clg %r9,BASED(cleanup_table+8) # sysc_do_svc
1da177e4 778 jl cleanup_system_call
c5328901 779 clg %r9,BASED(cleanup_table+16) # sysc_tif
1da177e4 780 jl 0f
c5328901 781 clg %r9,BASED(cleanup_table+24) # sysc_restore
6a2df3a8 782 jl cleanup_sysc_tif
c5328901 783 clg %r9,BASED(cleanup_table+32) # sysc_done
6a2df3a8 784 jl cleanup_sysc_restore
c5328901 785 clg %r9,BASED(cleanup_table+40) # io_tif
63b12246 786 jl 0f
c5328901 787 clg %r9,BASED(cleanup_table+48) # io_restore
6a2df3a8 788 jl cleanup_io_tif
c5328901 789 clg %r9,BASED(cleanup_table+56) # io_done
6a2df3a8 790 jl cleanup_io_restore
c5328901
MS		 7910: br %r14
792
1da177e4
LT		 793
794cleanup_system_call:
c5328901
MS		 795 # check if stpt has been executed
796 clg %r9,BASED(cleanup_system_call_insn)
1da177e4
LT		 797 jh 0f
798 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
c5328901 799 cghi %r11,__LC_SAVE_AREA_ASYNC
6377981f 800 je 0f
c5328901
MS		 801 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
8020: # check if stmg has been executed
803 clg %r9,BASED(cleanup_system_call_insn+8)
1da177e4 804 jh 0f
c5328901
MS		 805 mvc __LC_SAVE_AREA_SYNC(64),0(%r11)
8060: # check if base register setup + TIF bit load has been done
807 clg %r9,BASED(cleanup_system_call_insn+16)
808 jhe 0f
809 # set up saved registers r10 and r12
810 stg %r10,16(%r11) # r10 last break
811 stg %r12,32(%r11) # r12 thread-info pointer
8120: # check if the user time update has been done
813 clg %r9,BASED(cleanup_system_call_insn+24)
814 jh 0f
815 lg %r15,__LC_EXIT_TIMER
816 slg %r15,__LC_SYNC_ENTER_TIMER
817 alg %r15,__LC_USER_TIMER
818 stg %r15,__LC_USER_TIMER
8190: # check if the system time update has been done
820 clg %r9,BASED(cleanup_system_call_insn+32)
821 jh 0f
822 lg %r15,__LC_LAST_UPDATE_TIMER
823 slg %r15,__LC_EXIT_TIMER
824 alg %r15,__LC_SYSTEM_TIMER
825 stg %r15,__LC_SYSTEM_TIMER
8260: # update accounting time stamp
1da177e4 827 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
c5328901
MS		 828 # do LAST_BREAK
829 lg %r9,16(%r11)
830 srag %r9,%r9,23
86f2552b 831 jz 0f
c5328901
MS		 832 mvc __TI_last_break(8,%r12),16(%r11)
8330: # set up saved register r11
834 lg %r15,__LC_KERNEL_STACK
835 aghi %r15,-__PT_SIZE
836 stg %r15,24(%r11) # r11 pt_regs pointer
837 # fill pt_regs
838 mvc __PT_R8(64,%r15),__LC_SAVE_AREA_SYNC
839 stmg %r0,%r7,__PT_R0(%r15)
840 mvc __PT_PSW(16,%r15),__LC_SVC_OLD_PSW
aa33c8cb 841 mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC
c5328901
MS		 842 # setup saved register r15
843 aghi %r15,-STACK_FRAME_OVERHEAD
844 stg %r15,56(%r11) # r15 stack pointer
845 # set new psw address and exit
846 larl %r9,sysc_do_svc
1da177e4
LT		 847 br %r14
848cleanup_system_call_insn:
25d83cbf 849 .quad system_call
c5328901
MS		 850 .quad sysc_stmg
851 .quad sysc_per
852 .quad sysc_vtime+18
853 .quad sysc_vtime+42
1da177e4 854
6a2df3a8 855cleanup_sysc_tif:
c5328901 856 larl %r9,sysc_tif
1da177e4
LT		 857 br %r14
858
6a2df3a8 859cleanup_sysc_restore:
c5328901 860 clg %r9,BASED(cleanup_sysc_restore_insn)
6377981f 861 je 0f
c5328901
MS		 862 lg %r9,24(%r11) # get saved pointer to pt_regs
863 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
864 mvc 0(64,%r11),__PT_R8(%r9)
865 lmg %r0,%r7,__PT_R0(%r9)
8660: lmg %r8,%r9,__LC_RETURN_PSW
1da177e4 867 br %r14
6a2df3a8 868cleanup_sysc_restore_insn:
411788ea 869 .quad sysc_done - 4
1da177e4 870
6a2df3a8 871cleanup_io_tif:
c5328901 872 larl %r9,io_tif
176b1803
MS		 873 br %r14
874
6a2df3a8 875cleanup_io_restore:
c5328901
MS		 876 clg %r9,BASED(cleanup_io_restore_insn)
877 je 0f
878 lg %r9,24(%r11) # get saved r11 pointer to pt_regs
879 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
880 ni __LC_RETURN_PSW+1,0xfd # clear wait state bit
881 mvc 0(64,%r11),__PT_R8(%r9)
882 lmg %r0,%r7,__PT_R0(%r9)
8830: lmg %r8,%r9,__LC_RETURN_PSW
ae6aa2ea 884 br %r14
6a2df3a8 885cleanup_io_restore_insn:
411788ea 886 .quad io_done - 4
ae6aa2ea 887
1da177e4
LT		 888/*
889 * Integer constants
890 */
c5328901 891 .align 8
1da177e4 892.Lcritical_start:
c5328901
MS		 893 .quad __critical_start
894.Lcritical_length:
895 .quad __critical_end - __critical_start
896
1da177e4 897
603d1a50
MS		 898#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
899/*
900 * sie64a calling convention:
901 * %r2 pointer to sie control block
902 * %r3 guest register save area
903 */
144d634a 904ENTRY(sie64a)
603d1a50
MS		 905 stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers
906 stg %r2,__SF_EMPTY(%r15) # save control block pointer
907 stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
ddd6f953 908 xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # host id == 0
603d1a50
MS		 909 lmg %r0,%r13,0(%r3) # load guest gprs 0-13
910 lg %r14,__LC_THREAD_INFO # pointer thread_info struct
911 oi __TI_flags+6(%r14),_TIF_SIE>>8
912sie_loop:
913 lg %r14,__LC_THREAD_INFO # pointer thread_info struct
914 tm __TI_flags+7(%r14),_TIF_EXIT_SIE
915 jnz sie_exit
480e5926
CB		 916 lg %r14,__LC_GMAP # get gmap pointer
917 ltgr %r14,%r14
918 jz sie_gmap
919 lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce
920sie_gmap:
603d1a50
MS		 921 lg %r14,__SF_EMPTY(%r15) # get control block pointer
922 SPP __SF_EMPTY(%r15) # set guest id
923 sie 0(%r14)
924sie_done:
ddd6f953 925 SPP __SF_EMPTY+16(%r15) # set host id
603d1a50
MS		 926 lg %r14,__LC_THREAD_INFO # pointer thread_info struct
927sie_exit:
480e5926 928 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
603d1a50
MS		 929 ni __TI_flags+6(%r14),255-(_TIF_SIE>>8)
930 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
931 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
932 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
933 lghi %r2,0
934 br %r14
935sie_fault:
69ba9743 936 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
603d1a50
MS		 937 lg %r14,__LC_THREAD_INFO # pointer thread_info struct
938 ni __TI_flags+6(%r14),255-(_TIF_SIE>>8)
939 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
940 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
941 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
942 lghi %r2,-EFAULT
943 br %r14
944
945 .align 8
946.Lsie_loop:
947 .quad sie_loop
c5328901
MS		 948.Lsie_length:
949 .quad sie_done - sie_loop
ddd6f953
MS		 950.Lhost_id:
951 .quad 0
603d1a50
MS		 952
953 .section __ex_table,"a"
954 .quad sie_loop,sie_fault
955 .previous
956#endif
957
25d83cbf 958 .section .rodata, "a"
1da177e4 959#define SYSCALL(esa,esame,emu) .long esame
9bf1226b 960 .globl sys_call_table
1da177e4
LT		 961sys_call_table:
962#include "syscalls.S"
963#undef SYSCALL
964
347a8dc3 965#ifdef CONFIG_COMPAT
1da177e4
LT		 966
967#define SYSCALL(esa,esame,emu) .long emu
1da177e4
LT		 968sys_call_table_emu:
969#include "syscalls.S"
970#undef SYSCALL
971#endif
kernel source for telekom puls (alcatel/mediatek)