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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
[linux-2.6-block.git] / arch / s390 / kernel / entry.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>
1f44a225 22#include <asm/irq.h>
1da177e4 23
c5328901
MS		 24__PT_R0 = __PT_GPRS
25__PT_R1 = __PT_GPRS + 8
26__PT_R2 = __PT_GPRS + 16
27__PT_R3 = __PT_GPRS + 24
28__PT_R4 = __PT_GPRS + 32
29__PT_R5 = __PT_GPRS + 40
30__PT_R6 = __PT_GPRS + 48
31__PT_R7 = __PT_GPRS + 56
32__PT_R8 = __PT_GPRS + 64
33__PT_R9 = __PT_GPRS + 72
34__PT_R10 = __PT_GPRS + 80
35__PT_R11 = __PT_GPRS + 88
36__PT_R12 = __PT_GPRS + 96
37__PT_R13 = __PT_GPRS + 104
38__PT_R14 = __PT_GPRS + 112
39__PT_R15 = __PT_GPRS + 120
1da177e4
LT		 40
41STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
42STACK_SIZE = 1 << STACK_SHIFT
dc7ee00d 43STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
1da177e4 44
2a0a5b22
JW		 45_TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
46 _TIF_UPROBE)
d3a73acb
MS		 47_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
48 _TIF_SYSCALL_TRACEPOINT)
49_CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE)
50_PIF_WORK = (_PIF_PER_TRAP)
1da177e4
LT		 51
52#define BASED(name) name-system_call(%r13)
53
1f194a4c 54 .macro TRACE_IRQS_ON
c5328901 55#ifdef CONFIG_TRACE_IRQFLAGS
6a2df3a8
MS		 56 basr %r2,%r0
57 brasl %r14,trace_hardirqs_on_caller
c5328901 58#endif
1f194a4c
HC		 59 .endm
60
61 .macro TRACE_IRQS_OFF
c5328901 62#ifdef CONFIG_TRACE_IRQFLAGS
6a2df3a8
MS		 63 basr %r2,%r0
64 brasl %r14,trace_hardirqs_off_caller
411788ea 65#endif
c5328901 66 .endm
411788ea 67
411788ea 68 .macro LOCKDEP_SYS_EXIT
c5328901
MS		 69#ifdef CONFIG_LOCKDEP
70 tm __PT_PSW+1(%r11),0x01 # returning to user ?
71 jz .+10
411788ea 72 brasl %r14,lockdep_sys_exit
1f194a4c 73#endif
1da177e4 74 .endm
1da177e4 75
23d18e8d 76 .macro LPP newpp
61aa4884 77#if IS_ENABLED(CONFIG_KVM)
23d18e8d 78 tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_LPP
c5328901
MS		 79 jz .+8
80 .insn s,0xb2800000,\newpp
81#endif
82 .endm
1da177e4 83
7c470539 84 .macro HANDLE_SIE_INTERCEPT scratch,reason
61aa4884 85#if IS_ENABLED(CONFIG_KVM)
6022afc0 86 tmhh %r8,0x0001 # interrupting from user ?
7c470539 87 jnz .+62
c5328901 88 lgr \scratch,%r9
7c470539
MS		 89 slg \scratch,BASED(.Lsie_critical)
90 clg \scratch,BASED(.Lsie_critical_length)
91 .if \reason==1
ce6a04ac
CB		 92 # Some program interrupts are suppressing (e.g. protection).
93 # We must also check the instruction after SIE in that case.
86ed42f4 94 # do_protection_exception will rewind to .Lrewind_pad
7c470539 95 jh .+42
ce6a04ac 96 .else
7c470539 97 jhe .+42
ce6a04ac 98 .endif
7c470539
MS		 99 lg %r14,__SF_EMPTY(%r15) # get control block pointer
100 LPP __SF_EMPTY+16(%r15) # set host id
95d38fd0 101 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
7c470539
MS		 102 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
103 larl %r9,sie_exit # skip forward to sie_exit
104 mvi __SF_EMPTY+31(%r15),\reason # set exit reason
c5328901 105#endif
987ad70a
MS		 106 .endm
107
c5328901 108 .macro CHECK_STACK stacksize,savearea
63b12246 109#ifdef CONFIG_CHECK_STACK
c5328901
MS		 110 tml %r15,\stacksize - CONFIG_STACK_GUARD
111 lghi %r14,\savearea
112 jz stack_overflow
63b12246 113#endif
63b12246
MS		 114 .endm
115
c5328901
MS		 116 .macro SWITCH_ASYNC savearea,stack,shift
117 tmhh %r8,0x0001 # interrupting from user ?
118 jnz 1f
119 lgr %r14,%r9
120 slg %r14,BASED(.Lcritical_start)
121 clg %r14,BASED(.Lcritical_length)
1da177e4 122 jhe 0f
c5328901 123 lghi %r11,\savearea # inside critical section, do cleanup
1da177e4 124 brasl %r14,cleanup_critical
c5328901 125 tmhh %r8,0x0001 # retest problem state after cleanup
1da177e4 126 jnz 1f
c5328901 1270: lg %r14,\stack # are we already on the target stack?
1da177e4 128 slgr %r14,%r15
c5328901 129 srag %r14,%r14,\shift
86f2552b 130 jnz 1f
c5328901 131 CHECK_STACK 1<<\shift,\savearea
dc7ee00d 132 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
c5328901
MS		 133 j 2f
1341: lg %r15,\stack # load target stack
dc7ee00d 1352: la %r11,STACK_FRAME_OVERHEAD(%r15)
25d83cbf 136 .endm
1da177e4 137
c5328901
MS		 138 .macro UPDATE_VTIME scratch,enter_timer
139 lg \scratch,__LC_EXIT_TIMER
140 slg \scratch,\enter_timer
141 alg \scratch,__LC_USER_TIMER
142 stg \scratch,__LC_USER_TIMER
143 lg \scratch,__LC_LAST_UPDATE_TIMER
144 slg \scratch,__LC_EXIT_TIMER
145 alg \scratch,__LC_SYSTEM_TIMER
146 stg \scratch,__LC_SYSTEM_TIMER
147 mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer
1da177e4
LT		 148 .endm
149
c5328901
MS		 150 .macro LAST_BREAK scratch
151 srag \scratch,%r10,23
152 jz .+10
153 stg %r10,__TI_last_break(%r12)
86f2552b
MS		 154 .endm
155
1e54622e 156 .macro REENABLE_IRQS
c5328901
MS		 157 stg %r8,__LC_RETURN_PSW
158 ni __LC_RETURN_PSW,0xbf
159 ssm __LC_RETURN_PSW
1e54622e
MS		 160 .endm
161
473e66ba 162 .macro STCK savearea
d652d596 163#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
473e66ba
HC		 164 .insn s,0xb27c0000,\savearea # store clock fast
165#else
166 .insn s,0xb2050000,\savearea # store clock
167#endif
168 .endm
169
860dba45
MS		 170 .section .kprobes.text, "ax"
171
1da177e4
LT		 172/*
173 * Scheduler resume function, called by switch_to
174 * gpr2 = (task_struct *) prev
175 * gpr3 = (task_struct *) next
176 * Returns:
177 * gpr2 = prev
178 */
144d634a 179ENTRY(__switch_to)
eda0c6d6 180 stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
3827ec3d
MS		 181 lgr %r1,%r2
182 aghi %r1,__TASK_thread # thread_struct of prev task
183 lg %r4,__TASK_thread_info(%r2) # get thread_info of prev
184 lg %r5,__TASK_thread_info(%r3) # get thread_info of next
185 stg %r15,__THREAD_ksp(%r1) # store kernel stack of prev
186 lgr %r1,%r3
187 aghi %r1,__TASK_thread # thread_struct of next task
eda0c6d6 188 lgr %r15,%r5
dc7ee00d 189 aghi %r15,STACK_INIT # end of kernel stack of next
eda0c6d6
MS		 190 stg %r3,__LC_CURRENT # store task struct of next
191 stg %r5,__LC_THREAD_INFO # store thread info of next
192 stg %r15,__LC_KERNEL_STACK # store end of kernel stack
3827ec3d 193 lg %r15,__THREAD_ksp(%r1) # load kernel stack of next
eda0c6d6
MS		 194 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
195 mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
d3a73acb 196 lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
1da177e4
LT		 197 br %r14
198
86ed42f4 199.L__critical_start:
1da177e4
LT		 200/*
201 * SVC interrupt handler routine. System calls are synchronous events and
202 * are executed with interrupts enabled.
203 */
204
144d634a 205ENTRY(system_call)
c185b783 206 stpt __LC_SYNC_ENTER_TIMER
86ed42f4 207.Lsysc_stmg:
c5328901
MS		 208 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
209 lg %r10,__LC_LAST_BREAK
210 lg %r12,__LC_THREAD_INFO
d3a73acb 211 lghi %r14,_PIF_SYSCALL
86ed42f4 212.Lsysc_per:
c5328901 213 lg %r15,__LC_KERNEL_STACK
c5328901 214 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
86ed42f4 215.Lsysc_vtime:
c5328901
MS		 216 UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER
217 LAST_BREAK %r13
218 stmg %r0,%r7,__PT_R0(%r11)
219 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
220 mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
aa33c8cb 221 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
d3a73acb 222 stg %r14,__PT_FLAGS(%r11)
86ed42f4 223.Lsysc_do_svc:
61649881 224 lg %r10,__TI_sysc_table(%r12) # address of system call table
aa33c8cb 225 llgh %r8,__PT_INT_CODE+2(%r11)
c5328901 226 slag %r8,%r8,2 # shift and test for svc 0
86ed42f4 227 jnz .Lsysc_nr_ok
1da177e4 228 # svc 0: system call number in %r1
c5328901 229 llgfr %r1,%r1 # clear high word in r1
86f2552b 230 cghi %r1,NR_syscalls
86ed42f4 231 jnl .Lsysc_nr_ok
aa33c8cb 232 sth %r1,__PT_INT_CODE+2(%r11)
c5328901 233 slag %r8,%r1,2
86ed42f4 234.Lsysc_nr_ok:
c5328901
MS		 235 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
236 stg %r2,__PT_ORIG_GPR2(%r11)
237 stg %r7,STACK_FRAME_OVERHEAD(%r15)
238 lgf %r9,0(%r8,%r10) # get system call add.
d3a73acb 239 tm __TI_flags+7(%r12),_TIF_TRACE
86ed42f4 240 jnz .Lsysc_tracesys
c5328901
MS		 241 basr %r14,%r9 # call sys_xxxx
242 stg %r2,__PT_R2(%r11) # store return value
1da177e4 243
86ed42f4 244.Lsysc_return:
6a2df3a8 245 LOCKDEP_SYS_EXIT
86ed42f4 246.Lsysc_tif:
c5328901 247 tm __PT_PSW+1(%r11),0x01 # returning to user ?
86ed42f4 248 jno .Lsysc_restore
d3a73acb 249 tm __PT_FLAGS+7(%r11),_PIF_WORK
86ed42f4 250 jnz .Lsysc_work
d3a73acb 251 tm __TI_flags+7(%r12),_TIF_WORK
86ed42f4 252 jnz .Lsysc_work # check for work
d3a73acb 253 tm __LC_CPU_FLAGS+7,_CIF_WORK
86ed42f4
MS		 254 jnz .Lsysc_work
255.Lsysc_restore:
c5328901
MS		 256 lg %r14,__LC_VDSO_PER_CPU
257 lmg %r0,%r10,__PT_R0(%r11)
258 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
259 stpt __LC_EXIT_TIMER
260 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
261 lmg %r11,%r15,__PT_R11(%r11)
262 lpswe __LC_RETURN_PSW
86ed42f4 263.Lsysc_done:
411788ea 264
43d399d2
MS		 265#
266# One of the work bits is on. Find out which one.
267#
86ed42f4 268.Lsysc_work:
d3a73acb 269 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING
86ed42f4 270 jo .Lsysc_mcck_pending
86f2552b 271 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
86ed42f4 272 jo .Lsysc_reschedule
2a0a5b22
JW		 273#ifdef CONFIG_UPROBES
274 tm __TI_flags+7(%r12),_TIF_UPROBE
86ed42f4 275 jo .Lsysc_uprobe_notify
2a0a5b22 276#endif
d3a73acb 277 tm __PT_FLAGS+7(%r11),_PIF_PER_TRAP
86ed42f4 278 jo .Lsysc_singlestep
86f2552b 279 tm __TI_flags+7(%r12),_TIF_SIGPENDING
86ed42f4 280 jo .Lsysc_sigpending
86f2552b 281 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
86ed42f4 282 jo .Lsysc_notify_resume
d3a73acb 283 tm __LC_CPU_FLAGS+7,_CIF_ASCE
86ed42f4
MS		 284 jo .Lsysc_uaccess
285 j .Lsysc_return # beware of critical section cleanup
1da177e4
LT		 286
287#
288# _TIF_NEED_RESCHED is set, call schedule
25d83cbf 289#
86ed42f4
MS		 290.Lsysc_reschedule:
291 larl %r14,.Lsysc_return
c5328901 292 jg schedule
1da177e4 293
77fa2245 294#
d3a73acb 295# _CIF_MCCK_PENDING is set, call handler
77fa2245 296#
86ed42f4
MS		 297.Lsysc_mcck_pending:
298 larl %r14,.Lsysc_return
25d83cbf 299 jg s390_handle_mcck # TIF bit will be cleared by handler
77fa2245 300
457f2180 301#
d3a73acb 302# _CIF_ASCE is set, load user space asce
457f2180 303#
86ed42f4 304.Lsysc_uaccess:
d3a73acb 305 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE
457f2180 306 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
86ed42f4 307 j .Lsysc_return
457f2180 308
1da177e4 309#
02a029b3 310# _TIF_SIGPENDING is set, call do_signal
1da177e4 311#
86ed42f4 312.Lsysc_sigpending:
c5328901
MS		 313 lgr %r2,%r11 # pass pointer to pt_regs
314 brasl %r14,do_signal
d3a73acb 315 tm __PT_FLAGS+7(%r11),_PIF_SYSCALL
86ed42f4 316 jno .Lsysc_return
c5328901 317 lmg %r2,%r7,__PT_R2(%r11) # load svc arguments
dbbfe487 318 lg %r10,__TI_sysc_table(%r12) # address of system call table
c5328901 319 lghi %r8,0 # svc 0 returns -ENOSYS
450e47da 320 llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number
b6ef5bb3 321 cghi %r1,NR_syscalls
86ed42f4 322 jnl .Lsysc_nr_ok # invalid svc number -> do svc 0
c5328901 323 slag %r8,%r1,2
86ed42f4 324 j .Lsysc_nr_ok # restart svc
1da177e4 325
753c4dd6
MS		 326#
327# _TIF_NOTIFY_RESUME is set, call do_notify_resume
328#
86ed42f4 329.Lsysc_notify_resume:
c5328901 330 lgr %r2,%r11 # pass pointer to pt_regs
86ed42f4 331 larl %r14,.Lsysc_return
c5328901 332 jg do_notify_resume
753c4dd6 333
2a0a5b22
JW		 334#
335# _TIF_UPROBE is set, call uprobe_notify_resume
336#
337#ifdef CONFIG_UPROBES
86ed42f4 338.Lsysc_uprobe_notify:
2a0a5b22 339 lgr %r2,%r11 # pass pointer to pt_regs
86ed42f4 340 larl %r14,.Lsysc_return
2a0a5b22
JW		 341 jg uprobe_notify_resume
342#endif
343
1da177e4 344#
d3a73acb 345# _PIF_PER_TRAP is set, call do_per_trap
1da177e4 346#
86ed42f4 347.Lsysc_singlestep:
d3a73acb 348 ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP
c5328901 349 lgr %r2,%r11 # pass pointer to pt_regs
86ed42f4 350 larl %r14,.Lsysc_return
5e9a2692 351 jg do_per_trap
1da177e4 352
1da177e4 353#
753c4dd6
MS		 354# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
355# and after the system call
1da177e4 356#
86ed42f4 357.Lsysc_tracesys:
c5328901 358 lgr %r2,%r11 # pass pointer to pt_regs
1da177e4 359 la %r3,0
aa33c8cb 360 llgh %r0,__PT_INT_CODE+2(%r11)
c5328901 361 stg %r0,__PT_R2(%r11)
753c4dd6 362 brasl %r14,do_syscall_trace_enter
1da177e4 363 lghi %r0,NR_syscalls
753c4dd6 364 clgr %r0,%r2
86ed42f4 365 jnh .Lsysc_tracenogo
c5328901
MS		 366 sllg %r8,%r2,2
367 lgf %r9,0(%r8,%r10)
86ed42f4 368.Lsysc_tracego:
c5328901
MS		 369 lmg %r3,%r7,__PT_R3(%r11)
370 stg %r7,STACK_FRAME_OVERHEAD(%r15)
371 lg %r2,__PT_ORIG_GPR2(%r11)
372 basr %r14,%r9 # call sys_xxx
373 stg %r2,__PT_R2(%r11) # store return value
86ed42f4 374.Lsysc_tracenogo:
d3a73acb 375 tm __TI_flags+7(%r12),_TIF_TRACE
86ed42f4 376 jz .Lsysc_return
c5328901 377 lgr %r2,%r11 # pass pointer to pt_regs
86ed42f4 378 larl %r14,.Lsysc_return
753c4dd6 379 jg do_syscall_trace_exit
1da177e4
LT		 380
381#
382# a new process exits the kernel with ret_from_fork
383#
144d634a 384ENTRY(ret_from_fork)
c5328901
MS		 385 la %r11,STACK_FRAME_OVERHEAD(%r15)
386 lg %r12,__LC_THREAD_INFO
37fe5d41
AV		 387 brasl %r14,schedule_tail
388 TRACE_IRQS_ON
389 ssm __LC_SVC_NEW_PSW # reenable interrupts
30dcb099 390 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ?
86ed42f4 391 jne .Lsysc_tracenogo
30dcb099
AV		 392 # it's a kernel thread
393 lmg %r9,%r10,__PT_R9(%r11) # load gprs
37fe5d41
AV		 394ENTRY(kernel_thread_starter)
395 la %r2,0(%r10)
396 basr %r14,%r9
86ed42f4 397 j .Lsysc_tracenogo
1da177e4
LT		 398
399/*
400 * Program check handler routine
401 */
402
144d634a 403ENTRY(pgm_check_handler)
c185b783 404 stpt __LC_SYNC_ENTER_TIMER
c5328901
MS		 405 stmg %r8,%r15,__LC_SAVE_AREA_SYNC
406 lg %r10,__LC_LAST_BREAK
407 lg %r12,__LC_THREAD_INFO
408 larl %r13,system_call
409 lmg %r8,%r9,__LC_PGM_OLD_PSW
ce6a04ac 410 HANDLE_SIE_INTERCEPT %r14,1
c5328901
MS		 411 tmhh %r8,0x0001 # test problem state bit
412 jnz 1f # -> fault in user space
413 tmhh %r8,0x4000 # PER bit set in old PSW ?
414 jnz 0f # -> enabled, can't be a double fault
415 tm __LC_PGM_ILC+3,0x80 # check for per exception
86ed42f4 416 jnz .Lpgm_svcper # -> single stepped svc
c5328901 4170: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
dc7ee00d 418 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
c5328901
MS		 419 j 2f
4201: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER
421 LAST_BREAK %r14
422 lg %r15,__LC_KERNEL_STACK
d35339a4 423 lg %r14,__TI_task(%r12)
3827ec3d 424 aghi %r14,__TASK_thread # pointer to thread_struct
d35339a4
MS		 425 lghi %r13,__LC_PGM_TDB
426 tm __LC_PGM_ILC+2,0x02 # check for transaction abort
427 jz 2f
428 mvc __THREAD_trap_tdb(256,%r14),0(%r13)
dc7ee00d 4292: la %r11,STACK_FRAME_OVERHEAD(%r15)
c5328901
MS		 430 stmg %r0,%r7,__PT_R0(%r11)
431 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
432 stmg %r8,%r9,__PT_PSW(%r11)
aa33c8cb
MS		 433 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
434 mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE
d3a73acb 435 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
c5328901
MS		 436 stg %r10,__PT_ARGS(%r11)
437 tm __LC_PGM_ILC+3,0x80 # check for per exception
438 jz 0f
c5328901 439 tmhh %r8,0x0001 # kernel per event ?
86ed42f4 440 jz .Lpgm_kprobe
d3a73acb 441 oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP
d35339a4 442 mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS
21ee7ffd
JF		 443 mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE
444 mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID
aa33c8cb 4450: REENABLE_IRQS
c5328901 446 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
f5cdac27 447 larl %r1,pgm_check_table
aa33c8cb
MS		 448 llgh %r10,__PT_INT_CODE+2(%r11)
449 nill %r10,0x007f
b01a37a7 450 sll %r10,2
86ed42f4 451 je .Lsysc_return
b01a37a7 452 lgf %r1,0(%r10,%r1) # load address of handler routine
c5328901 453 lgr %r2,%r11 # pass pointer to pt_regs
f5cdac27 454 basr %r14,%r1 # branch to interrupt-handler
86ed42f4 455 j .Lsysc_return
1da177e4
LT		 456
457#
c5328901 458# PER event in supervisor state, must be kprobes
1da177e4 459#
86ed42f4 460.Lpgm_kprobe:
c5328901
MS		 461 REENABLE_IRQS
462 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
463 lgr %r2,%r11 # pass pointer to pt_regs
464 brasl %r14,do_per_trap
86ed42f4 465 j .Lsysc_return
1da177e4 466
4ba069b8 467#
c5328901 468# single stepped system call
4ba069b8 469#
86ed42f4 470.Lpgm_svcper:
c5328901 471 mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW
86ed42f4 472 larl %r14,.Lsysc_per
c5328901 473 stg %r14,__LC_RETURN_PSW+8
d3a73acb 474 lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP
86ed42f4 475 lpswe __LC_RETURN_PSW # branch to .Lsysc_per and enable irqs
4ba069b8 476
1da177e4
LT		 477/*
478 * IO interrupt handler routine
479 */
144d634a 480ENTRY(io_int_handler)
473e66ba 481 STCK __LC_INT_CLOCK
9cfb9b3c 482 stpt __LC_ASYNC_ENTER_TIMER
c5328901
MS		 483 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
484 lg %r10,__LC_LAST_BREAK
485 lg %r12,__LC_THREAD_INFO
486 larl %r13,system_call
487 lmg %r8,%r9,__LC_IO_OLD_PSW
7c470539 488 HANDLE_SIE_INTERCEPT %r14,2
c5328901
MS		 489 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
490 tmhh %r8,0x0001 # interrupting from user?
86ed42f4 491 jz .Lio_skip
c5328901
MS		 492 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
493 LAST_BREAK %r14
86ed42f4 494.Lio_skip:
c5328901
MS		 495 stmg %r0,%r7,__PT_R0(%r11)
496 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
497 stmg %r8,%r9,__PT_PSW(%r11)
48f6b00c 498 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
d3a73acb 499 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
1f194a4c 500 TRACE_IRQS_OFF
c5328901 501 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
86ed42f4 502.Lio_loop:
c5328901 503 lgr %r2,%r11 # pass pointer to pt_regs
1f44a225
MS		 504 lghi %r3,IO_INTERRUPT
505 tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ?
86ed42f4 506 jz .Lio_call
1f44a225 507 lghi %r3,THIN_INTERRUPT
86ed42f4 508.Lio_call:
c5328901 509 brasl %r14,do_IRQ
48f6b00c 510 tm __LC_MACHINE_FLAGS+6,0x10 # MACHINE_FLAG_LPAR
86ed42f4 511 jz .Lio_return
48f6b00c 512 tpi 0
86ed42f4 513 jz .Lio_return
48f6b00c 514 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
86ed42f4
MS		 515 j .Lio_loop
516.Lio_return:
6a2df3a8
MS		 517 LOCKDEP_SYS_EXIT
518 TRACE_IRQS_ON
86ed42f4 519.Lio_tif:
d3a73acb 520 tm __TI_flags+7(%r12),_TIF_WORK
86ed42f4 521 jnz .Lio_work # there is work to do (signals etc.)
d3a73acb 522 tm __LC_CPU_FLAGS+7,_CIF_WORK
86ed42f4
MS		 523 jnz .Lio_work
524.Lio_restore:
c5328901
MS		 525 lg %r14,__LC_VDSO_PER_CPU
526 lmg %r0,%r10,__PT_R0(%r11)
527 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
c5328901
MS		 528 stpt __LC_EXIT_TIMER
529 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
530 lmg %r11,%r15,__PT_R11(%r11)
531 lpswe __LC_RETURN_PSW
86ed42f4 532.Lio_done:
1da177e4 533
2688905e 534#
43d399d2 535# There is work todo, find out in which context we have been interrupted:
d3a73acb 536# 1) if we return to user space we can do all _TIF_WORK work
43d399d2
MS		 537# 2) if we return to kernel code and kvm is enabled check if we need to
538# modify the psw to leave SIE
539# 3) if we return to kernel code and preemptive scheduling is enabled check
540# the preemption counter and if it is zero call preempt_schedule_irq
541# Before any work can be done, a switch to the kernel stack is required.
2688905e 542#
86ed42f4 543.Lio_work:
c5328901 544 tm __PT_PSW+1(%r11),0x01 # returning to user ?
86ed42f4 545 jo .Lio_work_user # yes -> do resched & signal
43d399d2 546#ifdef CONFIG_PREEMPT
2688905e 547 # check for preemptive scheduling
86f2552b 548 icm %r0,15,__TI_precount(%r12)
86ed42f4 549 jnz .Lio_restore # preemption is disabled
6a2df3a8 550 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
86ed42f4 551 jno .Lio_restore
1da177e4 552 # switch to kernel stack
c5328901
MS		 553 lg %r1,__PT_R15(%r11)
554 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
555 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
556 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
557 la %r11,STACK_FRAME_OVERHEAD(%r1)
1da177e4 558 lgr %r15,%r1
86ed42f4 559 # TRACE_IRQS_ON already done at .Lio_return, call
6a2df3a8
MS		 560 # TRACE_IRQS_OFF to keep things symmetrical
561 TRACE_IRQS_OFF
562 brasl %r14,preempt_schedule_irq
86ed42f4 563 j .Lio_return
6a2df3a8 564#else
86ed42f4 565 j .Lio_restore
6a2df3a8 566#endif
1da177e4 567
43d399d2
MS		 568#
569# Need to do work before returning to userspace, switch to kernel stack
570#
86ed42f4 571.Lio_work_user:
1da177e4 572 lg %r1,__LC_KERNEL_STACK
c5328901
MS		 573 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
574 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
575 la %r11,STACK_FRAME_OVERHEAD(%r1)
1da177e4 576 lgr %r15,%r1
43d399d2 577
1da177e4
LT		 578#
579# One of the work bits is on. Find out which one.
1da177e4 580#
86ed42f4 581.Lio_work_tif:
d3a73acb 582 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING
86ed42f4 583 jo .Lio_mcck_pending
86f2552b 584 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
86ed42f4 585 jo .Lio_reschedule
86f2552b 586 tm __TI_flags+7(%r12),_TIF_SIGPENDING
86ed42f4 587 jo .Lio_sigpending
86f2552b 588 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
86ed42f4 589 jo .Lio_notify_resume
d3a73acb 590 tm __LC_CPU_FLAGS+7,_CIF_ASCE
86ed42f4
MS		 591 jo .Lio_uaccess
592 j .Lio_return # beware of critical section cleanup
0eaeafa1 593
77fa2245 594#
d3a73acb 595# _CIF_MCCK_PENDING is set, call handler
77fa2245 596#
86ed42f4
MS		 597.Lio_mcck_pending:
598 # TRACE_IRQS_ON already done at .Lio_return
b771aeac 599 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler
6a2df3a8 600 TRACE_IRQS_OFF
86ed42f4 601 j .Lio_return
77fa2245 602
457f2180 603#
d3a73acb 604# _CIF_ASCE is set, load user space asce
457f2180 605#
86ed42f4 606.Lio_uaccess:
d3a73acb 607 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE
457f2180 608 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
86ed42f4 609 j .Lio_return
457f2180 610
1da177e4
LT		 611#
612# _TIF_NEED_RESCHED is set, call schedule
25d83cbf 613#
86ed42f4
MS		 614.Lio_reschedule:
615 # TRACE_IRQS_ON already done at .Lio_return
c5328901 616 ssm __LC_SVC_NEW_PSW # reenable interrupts
25d83cbf 617 brasl %r14,schedule # call scheduler
c5328901 618 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
411788ea 619 TRACE_IRQS_OFF
86ed42f4 620 j .Lio_return
1da177e4
LT		 621
622#
02a029b3 623# _TIF_SIGPENDING or is set, call do_signal
1da177e4 624#
86ed42f4
MS		 625.Lio_sigpending:
626 # TRACE_IRQS_ON already done at .Lio_return
c5328901
MS		 627 ssm __LC_SVC_NEW_PSW # reenable interrupts
628 lgr %r2,%r11 # pass pointer to pt_regs
629 brasl %r14,do_signal
630 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
411788ea 631 TRACE_IRQS_OFF
86ed42f4 632 j .Lio_return
1da177e4 633
753c4dd6
MS		 634#
635# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
636#
86ed42f4
MS		 637.Lio_notify_resume:
638 # TRACE_IRQS_ON already done at .Lio_return
c5328901
MS		 639 ssm __LC_SVC_NEW_PSW # reenable interrupts
640 lgr %r2,%r11 # pass pointer to pt_regs
641 brasl %r14,do_notify_resume
642 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts
753c4dd6 643 TRACE_IRQS_OFF
86ed42f4 644 j .Lio_return
753c4dd6 645
1da177e4
LT		 646/*
647 * External interrupt handler routine
648 */
144d634a 649ENTRY(ext_int_handler)
473e66ba 650 STCK __LC_INT_CLOCK
9cfb9b3c 651 stpt __LC_ASYNC_ENTER_TIMER
c5328901
MS		 652 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
653 lg %r10,__LC_LAST_BREAK
654 lg %r12,__LC_THREAD_INFO
655 larl %r13,system_call
656 lmg %r8,%r9,__LC_EXT_OLD_PSW
7c470539 657 HANDLE_SIE_INTERCEPT %r14,3
c5328901
MS		 658 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT
659 tmhh %r8,0x0001 # interrupting from user ?
86ed42f4 660 jz .Lext_skip
c5328901
MS		 661 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER
662 LAST_BREAK %r14
86ed42f4 663.Lext_skip:
c5328901
MS		 664 stmg %r0,%r7,__PT_R0(%r11)
665 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
666 stmg %r8,%r9,__PT_PSW(%r11)
48f6b00c
MS		 667 lghi %r1,__LC_EXT_PARAMS2
668 mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR
669 mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS
670 mvc __PT_INT_PARM_LONG(8,%r11),0(%r1)
d3a73acb 671 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
1f194a4c 672 TRACE_IRQS_OFF
0de9db37 673 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
c5328901 674 lgr %r2,%r11 # pass pointer to pt_regs
1f44a225
MS		 675 lghi %r3,EXT_INTERRUPT
676 brasl %r14,do_IRQ
86ed42f4 677 j .Lio_return
1da177e4 678
4c1051e3 679/*
86ed42f4 680 * Load idle PSW. The second "half" of this function is in .Lcleanup_idle.
4c1051e3
MS		 681 */
682ENTRY(psw_idle)
27f6b416 683 stg %r3,__SF_EMPTY(%r15)
86ed42f4 684 larl %r1,.Lpsw_idle_lpsw+4
4c1051e3 685 stg %r1,__SF_EMPTY+8(%r15)
27f6b416
MS		 686 STCK __CLOCK_IDLE_ENTER(%r2)
687 stpt __TIMER_IDLE_ENTER(%r2)
86ed42f4 688.Lpsw_idle_lpsw:
4c1051e3
MS		 689 lpswe __SF_EMPTY(%r15)
690 br %r14
86ed42f4 691.Lpsw_idle_end:
4c1051e3 692
86ed42f4 693.L__critical_end:
ae6aa2ea 694
1da177e4
LT		 695/*
696 * Machine check handler routines
697 */
144d634a 698ENTRY(mcck_int_handler)
473e66ba 699 STCK __LC_MCCK_CLOCK
77fa2245
HC		 700 la %r1,4095 # revalidate r1
701 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
25d83cbf 702 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
c5328901
MS		 703 lg %r10,__LC_LAST_BREAK
704 lg %r12,__LC_THREAD_INFO
86f2552b 705 larl %r13,system_call
c5328901 706 lmg %r8,%r9,__LC_MCK_OLD_PSW
7c470539 707 HANDLE_SIE_INTERCEPT %r14,4
25d83cbf 708 tm __LC_MCCK_CODE,0x80 # system damage?
86ed42f4 709 jo .Lmcck_panic # yes -> rest of mcck code invalid
c5328901
MS		 710 lghi %r14,__LC_CPU_TIMER_SAVE_AREA
711 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
63b12246 712 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
c5328901 713 jo 3f
63b12246
MS		 714 la %r14,__LC_SYNC_ENTER_TIMER
715 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
716 jl 0f
717 la %r14,__LC_ASYNC_ENTER_TIMER
7180: clc 0(8,%r14),__LC_EXIT_TIMER
c5328901 719 jl 1f
63b12246 720 la %r14,__LC_EXIT_TIMER
c5328901
MS		 7211: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
722 jl 2f
63b12246 723 la %r14,__LC_LAST_UPDATE_TIMER
c5328901 7242: spt 0(%r14)
6377981f 725 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14)
c5328901 7263: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
86ed42f4 727 jno .Lmcck_panic # no -> skip cleanup critical
c5328901
MS		 728 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT
729 tm %r8,0x0001 # interrupting from user ?
86ed42f4 730 jz .Lmcck_skip
c5328901
MS		 731 UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER
732 LAST_BREAK %r14
86ed42f4 733.Lmcck_skip:
6551fbdf
MS		 734 lghi %r14,__LC_GPREGS_SAVE_AREA+64
735 stmg %r0,%r7,__PT_R0(%r11)
736 mvc __PT_R8(64,%r11),0(%r14)
c5328901 737 stmg %r8,%r9,__PT_PSW(%r11)
d3a73acb 738 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
c5328901
MS		 739 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
740 lgr %r2,%r11 # pass pointer to pt_regs
77fa2245 741 brasl %r14,s390_do_machine_check
c5328901 742 tm __PT_PSW+1(%r11),0x01 # returning to user ?
86ed42f4 743 jno .Lmcck_return
77fa2245 744 lg %r1,__LC_KERNEL_STACK # switch to kernel stack
c5328901
MS		 745 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
746 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
747 la %r11,STACK_FRAME_OVERHEAD(%r1)
77fa2245 748 lgr %r15,%r1
c5328901 749 ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off
d3a73acb 750 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING
86ed42f4 751 jno .Lmcck_return
1f194a4c 752 TRACE_IRQS_OFF
77fa2245 753 brasl %r14,s390_handle_mcck
1f194a4c 754 TRACE_IRQS_ON
86ed42f4 755.Lmcck_return:
c5328901
MS		 756 lg %r14,__LC_VDSO_PER_CPU
757 lmg %r0,%r10,__PT_R0(%r11)
758 mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
63b12246
MS		 759 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
760 jno 0f
761 stpt __LC_EXIT_TIMER
c5328901
MS		 762 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
7630: lmg %r11,%r15,__PT_R11(%r11)
764 lpswe __LC_RETURN_MCCK_PSW
765
86ed42f4 766.Lmcck_panic:
c5328901
MS		 767 lg %r14,__LC_PANIC_STACK
768 slgr %r14,%r15
769 srag %r14,%r14,PAGE_SHIFT
770 jz 0f
771 lg %r15,__LC_PANIC_STACK
7720: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
86ed42f4 773 j .Lmcck_skip
1da177e4 774
7dd6b334
MH		 775#
776# PSW restart interrupt handler
777#
8b646bd7 778ENTRY(restart_int_handler)
c5328901 779 stg %r15,__LC_SAVE_AREA_RESTART
8b646bd7 780 lg %r15,__LC_RESTART_STACK
c5328901 781 aghi %r15,-__PT_SIZE # create pt_regs on stack
8b646bd7 782 xc 0(__PT_SIZE,%r15),0(%r15)
c5328901
MS		 783 stmg %r0,%r14,__PT_R0(%r15)
784 mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
785 mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw
8b646bd7
MS		 786 aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack
787 xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
fbe76568
HC		 788 lg %r1,__LC_RESTART_FN # load fn, parm & source cpu
789 lg %r2,__LC_RESTART_DATA
790 lg %r3,__LC_RESTART_SOURCE
8b646bd7
MS		 791 ltgr %r3,%r3 # test source cpu address
792 jm 1f # negative -> skip source stop
eb546195 7930: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu
8b646bd7
MS		 794 brc 10,0b # wait for status stored
7951: basr %r14,%r1 # call function
796 stap __SF_EMPTY(%r15) # store cpu address
797 llgh %r3,__SF_EMPTY(%r15)
eb546195 7982: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu
8b646bd7
MS		 799 brc 2,2b
8003: j 3b
7dd6b334 801
860dba45
MS		 802 .section .kprobes.text, "ax"
803
1da177e4
LT		 804#ifdef CONFIG_CHECK_STACK
805/*
806 * The synchronous or the asynchronous stack overflowed. We are dead.
807 * No need to properly save the registers, we are going to panic anyway.
808 * Setup a pt_regs so that show_trace can provide a good call trace.
809 */
810stack_overflow:
dc7ee00d
MS		 811 lg %r15,__LC_PANIC_STACK # change to panic stack
812 la %r11,STACK_FRAME_OVERHEAD(%r15)
c5328901
MS		 813 stmg %r0,%r7,__PT_R0(%r11)
814 stmg %r8,%r9,__PT_PSW(%r11)
815 mvc __PT_R8(64,%r11),0(%r14)
816 stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2
c5328901
MS		 817 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
818 lgr %r2,%r11 # pass pointer to pt_regs
1da177e4
LT		 819 jg kernel_stack_overflow
820#endif
821
c5328901 822 .align 8
86ed42f4 823.Lcleanup_table:
c5328901 824 .quad system_call
86ed42f4
MS		 825 .quad .Lsysc_do_svc
826 .quad .Lsysc_tif
827 .quad .Lsysc_restore
828 .quad .Lsysc_done
829 .quad .Lio_tif
830 .quad .Lio_restore
831 .quad .Lio_done
4c1051e3 832 .quad psw_idle
86ed42f4 833 .quad .Lpsw_idle_end
1da177e4
LT		 834
835cleanup_critical:
86ed42f4 836 clg %r9,BASED(.Lcleanup_table) # system_call
1da177e4 837 jl 0f
86ed42f4
MS		 838 clg %r9,BASED(.Lcleanup_table+8) # .Lsysc_do_svc
839 jl .Lcleanup_system_call
840 clg %r9,BASED(.Lcleanup_table+16) # .Lsysc_tif
1da177e4 841 jl 0f
86ed42f4
MS		 842 clg %r9,BASED(.Lcleanup_table+24) # .Lsysc_restore
843 jl .Lcleanup_sysc_tif
844 clg %r9,BASED(.Lcleanup_table+32) # .Lsysc_done
845 jl .Lcleanup_sysc_restore
846 clg %r9,BASED(.Lcleanup_table+40) # .Lio_tif
63b12246 847 jl 0f
86ed42f4
MS		 848 clg %r9,BASED(.Lcleanup_table+48) # .Lio_restore
849 jl .Lcleanup_io_tif
850 clg %r9,BASED(.Lcleanup_table+56) # .Lio_done
851 jl .Lcleanup_io_restore
852 clg %r9,BASED(.Lcleanup_table+64) # psw_idle
4c1051e3 853 jl 0f
86ed42f4
MS		 854 clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end
855 jl .Lcleanup_idle
c5328901
MS		 8560: br %r14
857
1da177e4 858
86ed42f4 859.Lcleanup_system_call:
c5328901 860 # check if stpt has been executed
86ed42f4 861 clg %r9,BASED(.Lcleanup_system_call_insn)
1da177e4
LT		 862 jh 0f
863 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
c5328901 864 cghi %r11,__LC_SAVE_AREA_ASYNC
6377981f 865 je 0f
c5328901
MS		 866 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER
8670: # check if stmg has been executed
86ed42f4 868 clg %r9,BASED(.Lcleanup_system_call_insn+8)
1da177e4 869 jh 0f
c5328901
MS		 870 mvc __LC_SAVE_AREA_SYNC(64),0(%r11)
8710: # check if base register setup + TIF bit load has been done
86ed42f4 872 clg %r9,BASED(.Lcleanup_system_call_insn+16)
c5328901
MS		 873 jhe 0f
874 # set up saved registers r10 and r12
875 stg %r10,16(%r11) # r10 last break
876 stg %r12,32(%r11) # r12 thread-info pointer
8770: # check if the user time update has been done
86ed42f4 878 clg %r9,BASED(.Lcleanup_system_call_insn+24)
c5328901
MS		 879 jh 0f
880 lg %r15,__LC_EXIT_TIMER
881 slg %r15,__LC_SYNC_ENTER_TIMER
882 alg %r15,__LC_USER_TIMER
883 stg %r15,__LC_USER_TIMER
8840: # check if the system time update has been done
86ed42f4 885 clg %r9,BASED(.Lcleanup_system_call_insn+32)
c5328901
MS		 886 jh 0f
887 lg %r15,__LC_LAST_UPDATE_TIMER
888 slg %r15,__LC_EXIT_TIMER
889 alg %r15,__LC_SYSTEM_TIMER
890 stg %r15,__LC_SYSTEM_TIMER
8910: # update accounting time stamp
1da177e4 892 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
c5328901
MS		 893 # do LAST_BREAK
894 lg %r9,16(%r11)
895 srag %r9,%r9,23
86f2552b 896 jz 0f
c5328901
MS		 897 mvc __TI_last_break(8,%r12),16(%r11)
8980: # set up saved register r11
899 lg %r15,__LC_KERNEL_STACK
dc7ee00d
MS		 900 la %r9,STACK_FRAME_OVERHEAD(%r15)
901 stg %r9,24(%r11) # r11 pt_regs pointer
c5328901 902 # fill pt_regs
dc7ee00d
MS		 903 mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC
904 stmg %r0,%r7,__PT_R0(%r9)
905 mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW
906 mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC
d3a73acb
MS		 907 xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9)
908 mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL
c5328901 909 # setup saved register r15
c5328901
MS		 910 stg %r15,56(%r11) # r15 stack pointer
911 # set new psw address and exit
86ed42f4 912 larl %r9,.Lsysc_do_svc
1da177e4 913 br %r14
86ed42f4 914.Lcleanup_system_call_insn:
25d83cbf 915 .quad system_call
86ed42f4
MS		 916 .quad .Lsysc_stmg
917 .quad .Lsysc_per
918 .quad .Lsysc_vtime+18
919 .quad .Lsysc_vtime+42
1da177e4 920
86ed42f4
MS		 921.Lcleanup_sysc_tif:
922 larl %r9,.Lsysc_tif
1da177e4
LT		 923 br %r14
924
86ed42f4
MS		 925.Lcleanup_sysc_restore:
926 clg %r9,BASED(.Lcleanup_sysc_restore_insn)
6377981f 927 je 0f
c5328901
MS		 928 lg %r9,24(%r11) # get saved pointer to pt_regs
929 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
930 mvc 0(64,%r11),__PT_R8(%r9)
931 lmg %r0,%r7,__PT_R0(%r9)
9320: lmg %r8,%r9,__LC_RETURN_PSW
1da177e4 933 br %r14
86ed42f4
MS		 934.Lcleanup_sysc_restore_insn:
935 .quad .Lsysc_done - 4
1da177e4 936
86ed42f4
MS		 937.Lcleanup_io_tif:
938 larl %r9,.Lio_tif
176b1803
MS		 939 br %r14
940
86ed42f4
MS		 941.Lcleanup_io_restore:
942 clg %r9,BASED(.Lcleanup_io_restore_insn)
c5328901
MS		 943 je 0f
944 lg %r9,24(%r11) # get saved r11 pointer to pt_regs
945 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9)
c5328901
MS		 946 mvc 0(64,%r11),__PT_R8(%r9)
947 lmg %r0,%r7,__PT_R0(%r9)
9480: lmg %r8,%r9,__LC_RETURN_PSW
ae6aa2ea 949 br %r14
86ed42f4
MS		 950.Lcleanup_io_restore_insn:
951 .quad .Lio_done - 4
ae6aa2ea 952
86ed42f4 953.Lcleanup_idle:
4c1051e3 954 # copy interrupt clock & cpu timer
27f6b416
MS		 955 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK
956 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER
4c1051e3
MS		 957 cghi %r11,__LC_SAVE_AREA_ASYNC
958 je 0f
27f6b416
MS		 959 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK
960 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER
4c1051e3 9610: # check if stck & stpt have been executed
86ed42f4 962 clg %r9,BASED(.Lcleanup_idle_insn)
4c1051e3 963 jhe 1f
27f6b416
MS		 964 mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2)
965 mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2)
9661: # account system time going idle
4c1051e3 967 lg %r9,__LC_STEAL_TIMER
27f6b416 968 alg %r9,__CLOCK_IDLE_ENTER(%r2)
4c1051e3
MS		 969 slg %r9,__LC_LAST_UPDATE_CLOCK
970 stg %r9,__LC_STEAL_TIMER
27f6b416 971 mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
4c1051e3
MS		 972 lg %r9,__LC_SYSTEM_TIMER
973 alg %r9,__LC_LAST_UPDATE_TIMER
27f6b416 974 slg %r9,__TIMER_IDLE_ENTER(%r2)
4c1051e3 975 stg %r9,__LC_SYSTEM_TIMER
27f6b416 976 mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
4c1051e3 977 # prepare return psw
0587d409 978 nihh %r8,0xfcfd # clear irq & wait state bits
4c1051e3
MS		 979 lg %r9,48(%r11) # return from psw_idle
980 br %r14
86ed42f4
MS		 981.Lcleanup_idle_insn:
982 .quad .Lpsw_idle_lpsw
4c1051e3 983
1da177e4
LT		 984/*
985 * Integer constants
986 */
c5328901 987 .align 8
1da177e4 988.Lcritical_start:
86ed42f4 989 .quad .L__critical_start
c5328901 990.Lcritical_length:
86ed42f4 991 .quad .L__critical_end - .L__critical_start
c5328901 992
1da177e4 993
61aa4884 994#if IS_ENABLED(CONFIG_KVM)
603d1a50
MS		 995/*
996 * sie64a calling convention:
997 * %r2 pointer to sie control block
998 * %r3 guest register save area
999 */
144d634a 1000ENTRY(sie64a)
603d1a50
MS		 1001 stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers
1002 stg %r2,__SF_EMPTY(%r15) # save control block pointer
1003 stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
7c470539 1004 xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason
603d1a50 1005 lmg %r0,%r13,0(%r3) # load guest gprs 0-13
480e5926
CB		 1006 lg %r14,__LC_GMAP # get gmap pointer
1007 ltgr %r14,%r14
86ed42f4 1008 jz .Lsie_gmap
480e5926 1009 lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce
86ed42f4 1010.Lsie_gmap:
603d1a50 1011 lg %r14,__SF_EMPTY(%r15) # get control block pointer
49b99e1e 1012 oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now
8e236546 1013 tm __SIE_PROG20+3(%r14),3 # last exit...
86ed42f4 1014 jnz .Lsie_done
23d18e8d 1015 LPP __SF_EMPTY(%r15) # set guest id
603d1a50 1016 sie 0(%r14)
86ed42f4 1017.Lsie_done:
23d18e8d 1018 LPP __SF_EMPTY+16(%r15) # set host id
95d38fd0 1019 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
480e5926 1020 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
7c470539
MS		 1021# some program checks are suppressing. C code (e.g. do_protection_exception)
1022# will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other
86ed42f4 1023# instructions between sie64a and .Lsie_done should not cause program
7c470539
MS		 1024# interrupts. So lets use a nop (47 00 00 00) as a landing pad.
1025# See also HANDLE_SIE_INTERCEPT
86ed42f4 1026.Lrewind_pad:
7c470539 1027 nop 0
b764bb1c 1028 .globl sie_exit
7c470539 1029sie_exit:
603d1a50
MS		 1030 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
1031 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
1032 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
7c470539 1033 lg %r2,__SF_EMPTY+24(%r15) # return exit reason code
603d1a50 1034 br %r14
86ed42f4 1035.Lsie_fault:
7c470539
MS		 1036 lghi %r14,-EFAULT
1037 stg %r14,__SF_EMPTY+24(%r15) # set exit reason code
1038 j sie_exit
603d1a50
MS		 1039
1040 .align 8
7c470539 1041.Lsie_critical:
86ed42f4 1042 .quad .Lsie_gmap
7c470539 1043.Lsie_critical_length:
86ed42f4 1044 .quad .Lsie_done - .Lsie_gmap
603d1a50 1045
86ed42f4
MS		 1046 EX_TABLE(.Lrewind_pad,.Lsie_fault)
1047 EX_TABLE(sie_exit,.Lsie_fault)
603d1a50
MS		 1048#endif
1049
a876cb3f
HC		 1050 .section .rodata, "a"
1051#define SYSCALL(esame,emu) .long esame
9bf1226b 1052 .globl sys_call_table
1da177e4
LT		 1053sys_call_table:
1054#include "syscalls.S"
1055#undef SYSCALL
1056
347a8dc3 1057#ifdef CONFIG_COMPAT
1da177e4 1058
a876cb3f 1059#define SYSCALL(esame,emu) .long emu
61649881 1060 .globl sys_call_table_emu
1da177e4
LT		 1061sys_call_table_emu:
1062#include "syscalls.S"
1063#undef SYSCALL
1064#endif
Linux 6.x block layer and io_uring tree(s)