Commit | Line | Data |
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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 | |
41 | STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER | |
42 | STACK_SIZE = 1 << STACK_SHIFT | |
dc7ee00d | 43 | STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE |
1da177e4 | 44 | |
753c4dd6 | 45 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
b6ef5bb3 | 46 | _TIF_MCCK_PENDING | _TIF_PER_TRAP ) |
753c4dd6 | 47 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 48 | _TIF_MCCK_PENDING) |
b6ef5bb3 MS |
49 | _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
50 | _TIF_SYSCALL_TRACEPOINT) | |
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 |
c5328901 | 77 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
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 |
c5328901 | 85 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
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. | |
94 | # do_protection_exception will rewind to rewind_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 | 127 | 0: 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 |
134 | 1: lg %r15,\stack # load target stack | |
dc7ee00d | 135 | 2: 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 | 179 | ENTRY(__switch_to) |
eda0c6d6 MS |
180 | stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
181 | stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev | |
5e9a2692 MS |
182 | lg %r4,__THREAD_info(%r2) # get thread_info of prev |
183 | lg %r5,__THREAD_info(%r3) # get thread_info of next | |
eda0c6d6 | 184 | lgr %r15,%r5 |
dc7ee00d | 185 | aghi %r15,STACK_INIT # end of kernel stack of next |
eda0c6d6 MS |
186 | stg %r3,__LC_CURRENT # store task struct of next |
187 | stg %r5,__LC_THREAD_INFO # store thread info of next | |
188 | stg %r15,__LC_KERNEL_STACK # store end of kernel stack | |
189 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
190 | mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next | |
191 | lg %r15,__THREAD_ksp(%r3) # load kernel stack of next | |
77fa2245 | 192 | tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending? |
5e9a2692 MS |
193 | jz 0f |
194 | ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
195 | oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next | |
eda0c6d6 | 196 | 0: lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
1da177e4 LT |
197 | br %r14 |
198 | ||
199 | __critical_start: | |
200 | /* | |
201 | * SVC interrupt handler routine. System calls are synchronous events and | |
202 | * are executed with interrupts enabled. | |
203 | */ | |
204 | ||
144d634a | 205 | ENTRY(system_call) |
c185b783 | 206 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
207 | sysc_stmg: |
208 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC | |
209 | lg %r10,__LC_LAST_BREAK | |
210 | lg %r12,__LC_THREAD_INFO | |
c5328901 MS |
211 | sysc_per: |
212 | lg %r15,__LC_KERNEL_STACK | |
c5328901 | 213 | la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs |
1da177e4 | 214 | sysc_vtime: |
c5328901 MS |
215 | UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER |
216 | LAST_BREAK %r13 | |
217 | stmg %r0,%r7,__PT_R0(%r11) | |
218 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
219 | mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW | |
aa33c8cb | 220 | mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
1da177e4 | 221 | sysc_do_svc: |
c5328901 | 222 | oi __TI_flags+7(%r12),_TIF_SYSCALL |
61649881 | 223 | lg %r10,__TI_sysc_table(%r12) # address of system call table |
aa33c8cb | 224 | llgh %r8,__PT_INT_CODE+2(%r11) |
c5328901 | 225 | slag %r8,%r8,2 # shift and test for svc 0 |
1da177e4 LT |
226 | jnz sysc_nr_ok |
227 | # svc 0: system call number in %r1 | |
c5328901 | 228 | llgfr %r1,%r1 # clear high word in r1 |
86f2552b | 229 | cghi %r1,NR_syscalls |
1da177e4 | 230 | jnl sysc_nr_ok |
aa33c8cb | 231 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 | 232 | slag %r8,%r1,2 |
1da177e4 | 233 | sysc_nr_ok: |
c5328901 MS |
234 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
235 | stg %r2,__PT_ORIG_GPR2(%r11) | |
236 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
237 | lgf %r9,0(%r8,%r10) # get system call add. | |
b6ef5bb3 | 238 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 239 | jnz sysc_tracesys |
c5328901 MS |
240 | basr %r14,%r9 # call sys_xxxx |
241 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 LT |
242 | |
243 | sysc_return: | |
6a2df3a8 MS |
244 | LOCKDEP_SYS_EXIT |
245 | sysc_tif: | |
c5328901 | 246 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
b6ef5bb3 | 247 | jno sysc_restore |
86f2552b | 248 | tm __TI_flags+7(%r12),_TIF_WORK_SVC |
c5328901 | 249 | jnz sysc_work # check for work |
b6ef5bb3 | 250 | ni __TI_flags+7(%r12),255-_TIF_SYSCALL |
411788ea | 251 | sysc_restore: |
c5328901 MS |
252 | lg %r14,__LC_VDSO_PER_CPU |
253 | lmg %r0,%r10,__PT_R0(%r11) | |
254 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
255 | stpt __LC_EXIT_TIMER | |
256 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
257 | lmg %r11,%r15,__PT_R11(%r11) | |
258 | lpswe __LC_RETURN_PSW | |
411788ea HC |
259 | sysc_done: |
260 | ||
43d399d2 MS |
261 | # |
262 | # One of the work bits is on. Find out which one. | |
263 | # | |
b6ef5bb3 | 264 | sysc_work: |
86f2552b | 265 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 266 | jo sysc_mcck_pending |
86f2552b | 267 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 268 | jo sysc_reschedule |
39efd4ec MS |
269 | tm __TI_flags+7(%r12),_TIF_PER_TRAP |
270 | jo sysc_singlestep | |
86f2552b | 271 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 272 | jo sysc_sigpending |
86f2552b | 273 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 | 274 | jo sysc_notify_resume |
43d399d2 | 275 | j sysc_return # beware of critical section cleanup |
1da177e4 LT |
276 | |
277 | # | |
278 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
279 | # |
280 | sysc_reschedule: | |
6a2df3a8 | 281 | larl %r14,sysc_return |
c5328901 | 282 | jg schedule |
1da177e4 | 283 | |
77fa2245 HC |
284 | # |
285 | # _TIF_MCCK_PENDING is set, call handler | |
286 | # | |
287 | sysc_mcck_pending: | |
6a2df3a8 | 288 | larl %r14,sysc_return |
25d83cbf | 289 | jg s390_handle_mcck # TIF bit will be cleared by handler |
77fa2245 | 290 | |
1da177e4 | 291 | # |
02a029b3 | 292 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 293 | # |
25d83cbf | 294 | sysc_sigpending: |
c5328901 MS |
295 | lgr %r2,%r11 # pass pointer to pt_regs |
296 | brasl %r14,do_signal | |
b6ef5bb3 MS |
297 | tm __TI_flags+7(%r12),_TIF_SYSCALL |
298 | jno sysc_return | |
c5328901 | 299 | lmg %r2,%r7,__PT_R2(%r11) # load svc arguments |
dbbfe487 | 300 | lg %r10,__TI_sysc_table(%r12) # address of system call table |
c5328901 | 301 | lghi %r8,0 # svc 0 returns -ENOSYS |
450e47da | 302 | llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number |
b6ef5bb3 MS |
303 | cghi %r1,NR_syscalls |
304 | jnl sysc_nr_ok # invalid svc number -> do svc 0 | |
c5328901 | 305 | slag %r8,%r1,2 |
b6ef5bb3 | 306 | j sysc_nr_ok # restart svc |
1da177e4 | 307 | |
753c4dd6 MS |
308 | # |
309 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
310 | # | |
311 | sysc_notify_resume: | |
c5328901 | 312 | lgr %r2,%r11 # pass pointer to pt_regs |
6a2df3a8 | 313 | larl %r14,sysc_return |
c5328901 | 314 | jg do_notify_resume |
753c4dd6 | 315 | |
1da177e4 | 316 | # |
5e9a2692 | 317 | # _TIF_PER_TRAP is set, call do_per_trap |
1da177e4 LT |
318 | # |
319 | sysc_singlestep: | |
39efd4ec | 320 | ni __TI_flags+7(%r12),255-_TIF_PER_TRAP |
c5328901 MS |
321 | lgr %r2,%r11 # pass pointer to pt_regs |
322 | larl %r14,sysc_return | |
5e9a2692 | 323 | jg do_per_trap |
1da177e4 | 324 | |
1da177e4 | 325 | # |
753c4dd6 MS |
326 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
327 | # and after the system call | |
1da177e4 LT |
328 | # |
329 | sysc_tracesys: | |
c5328901 | 330 | lgr %r2,%r11 # pass pointer to pt_regs |
1da177e4 | 331 | la %r3,0 |
aa33c8cb | 332 | llgh %r0,__PT_INT_CODE+2(%r11) |
c5328901 | 333 | stg %r0,__PT_R2(%r11) |
753c4dd6 | 334 | brasl %r14,do_syscall_trace_enter |
1da177e4 | 335 | lghi %r0,NR_syscalls |
753c4dd6 | 336 | clgr %r0,%r2 |
1da177e4 | 337 | jnh sysc_tracenogo |
c5328901 MS |
338 | sllg %r8,%r2,2 |
339 | lgf %r9,0(%r8,%r10) | |
1da177e4 | 340 | sysc_tracego: |
c5328901 MS |
341 | lmg %r3,%r7,__PT_R3(%r11) |
342 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
343 | lg %r2,__PT_ORIG_GPR2(%r11) | |
344 | basr %r14,%r9 # call sys_xxx | |
345 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 | 346 | sysc_tracenogo: |
b6ef5bb3 | 347 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 348 | jz sysc_return |
c5328901 MS |
349 | lgr %r2,%r11 # pass pointer to pt_regs |
350 | larl %r14,sysc_return | |
753c4dd6 | 351 | jg do_syscall_trace_exit |
1da177e4 LT |
352 | |
353 | # | |
354 | # a new process exits the kernel with ret_from_fork | |
355 | # | |
144d634a | 356 | ENTRY(ret_from_fork) |
c5328901 MS |
357 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
358 | lg %r12,__LC_THREAD_INFO | |
37fe5d41 AV |
359 | brasl %r14,schedule_tail |
360 | TRACE_IRQS_ON | |
361 | ssm __LC_SVC_NEW_PSW # reenable interrupts | |
30dcb099 AV |
362 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? |
363 | jne sysc_tracenogo | |
364 | # it's a kernel thread | |
365 | lmg %r9,%r10,__PT_R9(%r11) # load gprs | |
37fe5d41 AV |
366 | ENTRY(kernel_thread_starter) |
367 | la %r2,0(%r10) | |
368 | basr %r14,%r9 | |
30dcb099 | 369 | j sysc_tracenogo |
1da177e4 LT |
370 | |
371 | /* | |
372 | * Program check handler routine | |
373 | */ | |
374 | ||
144d634a | 375 | ENTRY(pgm_check_handler) |
c185b783 | 376 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
377 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
378 | lg %r10,__LC_LAST_BREAK | |
379 | lg %r12,__LC_THREAD_INFO | |
380 | larl %r13,system_call | |
381 | lmg %r8,%r9,__LC_PGM_OLD_PSW | |
ce6a04ac | 382 | HANDLE_SIE_INTERCEPT %r14,1 |
c5328901 MS |
383 | tmhh %r8,0x0001 # test problem state bit |
384 | jnz 1f # -> fault in user space | |
385 | tmhh %r8,0x4000 # PER bit set in old PSW ? | |
386 | jnz 0f # -> enabled, can't be a double fault | |
387 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
388 | jnz pgm_svcper # -> single stepped svc | |
389 | 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC | |
dc7ee00d | 390 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
c5328901 MS |
391 | j 2f |
392 | 1: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER | |
393 | LAST_BREAK %r14 | |
394 | lg %r15,__LC_KERNEL_STACK | |
d35339a4 MS |
395 | lg %r14,__TI_task(%r12) |
396 | lghi %r13,__LC_PGM_TDB | |
397 | tm __LC_PGM_ILC+2,0x02 # check for transaction abort | |
398 | jz 2f | |
399 | mvc __THREAD_trap_tdb(256,%r14),0(%r13) | |
dc7ee00d | 400 | 2: la %r11,STACK_FRAME_OVERHEAD(%r15) |
c5328901 MS |
401 | stmg %r0,%r7,__PT_R0(%r11) |
402 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
403 | stmg %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
404 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
405 | mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE | |
c5328901 MS |
406 | stg %r10,__PT_ARGS(%r11) |
407 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
408 | jz 0f | |
c5328901 MS |
409 | tmhh %r8,0x0001 # kernel per event ? |
410 | jz pgm_kprobe | |
411 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
d35339a4 MS |
412 | mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS |
413 | mvc __THREAD_per_cause(2,%r14),__LC_PER_CAUSE | |
414 | mvc __THREAD_per_paid(1,%r14),__LC_PER_PAID | |
aa33c8cb | 415 | 0: REENABLE_IRQS |
c5328901 | 416 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f5cdac27 | 417 | larl %r1,pgm_check_table |
aa33c8cb MS |
418 | llgh %r10,__PT_INT_CODE+2(%r11) |
419 | nill %r10,0x007f | |
b01a37a7 | 420 | sll %r10,2 |
aa33c8cb | 421 | je sysc_return |
b01a37a7 | 422 | lgf %r1,0(%r10,%r1) # load address of handler routine |
c5328901 | 423 | lgr %r2,%r11 # pass pointer to pt_regs |
f5cdac27 | 424 | basr %r14,%r1 # branch to interrupt-handler |
f5cdac27 | 425 | j sysc_return |
1da177e4 LT |
426 | |
427 | # | |
c5328901 | 428 | # PER event in supervisor state, must be kprobes |
1da177e4 | 429 | # |
c5328901 MS |
430 | pgm_kprobe: |
431 | REENABLE_IRQS | |
432 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
433 | lgr %r2,%r11 # pass pointer to pt_regs | |
434 | brasl %r14,do_per_trap | |
435 | j sysc_return | |
1da177e4 | 436 | |
4ba069b8 | 437 | # |
c5328901 | 438 | # single stepped system call |
4ba069b8 | 439 | # |
c5328901 MS |
440 | pgm_svcper: |
441 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
442 | mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW | |
443 | larl %r14,sysc_per | |
444 | stg %r14,__LC_RETURN_PSW+8 | |
445 | lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs | |
4ba069b8 | 446 | |
1da177e4 LT |
447 | /* |
448 | * IO interrupt handler routine | |
449 | */ | |
144d634a | 450 | ENTRY(io_int_handler) |
473e66ba | 451 | STCK __LC_INT_CLOCK |
9cfb9b3c | 452 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
453 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
454 | lg %r10,__LC_LAST_BREAK | |
455 | lg %r12,__LC_THREAD_INFO | |
456 | larl %r13,system_call | |
457 | lmg %r8,%r9,__LC_IO_OLD_PSW | |
7c470539 | 458 | HANDLE_SIE_INTERCEPT %r14,2 |
c5328901 MS |
459 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT |
460 | tmhh %r8,0x0001 # interrupting from user? | |
461 | jz io_skip | |
462 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
463 | LAST_BREAK %r14 | |
464 | io_skip: | |
465 | stmg %r0,%r7,__PT_R0(%r11) | |
466 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
467 | stmg %r8,%r9,__PT_PSW(%r11) | |
48f6b00c | 468 | mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID |
1f194a4c | 469 | TRACE_IRQS_OFF |
c5328901 | 470 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
48f6b00c | 471 | io_loop: |
c5328901 | 472 | lgr %r2,%r11 # pass pointer to pt_regs |
1f44a225 MS |
473 | lghi %r3,IO_INTERRUPT |
474 | tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ? | |
475 | jz io_call | |
476 | lghi %r3,THIN_INTERRUPT | |
477 | io_call: | |
c5328901 | 478 | brasl %r14,do_IRQ |
48f6b00c MS |
479 | tm __LC_MACHINE_FLAGS+6,0x10 # MACHINE_FLAG_LPAR |
480 | jz io_return | |
481 | tpi 0 | |
482 | jz io_return | |
483 | mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID | |
484 | j io_loop | |
1da177e4 | 485 | io_return: |
6a2df3a8 MS |
486 | LOCKDEP_SYS_EXIT |
487 | TRACE_IRQS_ON | |
488 | io_tif: | |
86f2552b | 489 | tm __TI_flags+7(%r12),_TIF_WORK_INT |
25d83cbf | 490 | jnz io_work # there is work to do (signals etc.) |
411788ea | 491 | io_restore: |
c5328901 MS |
492 | lg %r14,__LC_VDSO_PER_CPU |
493 | lmg %r0,%r10,__PT_R0(%r11) | |
494 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
c5328901 MS |
495 | stpt __LC_EXIT_TIMER |
496 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
497 | lmg %r11,%r15,__PT_R11(%r11) | |
498 | lpswe __LC_RETURN_PSW | |
ae6aa2ea | 499 | io_done: |
1da177e4 | 500 | |
2688905e | 501 | # |
43d399d2 MS |
502 | # There is work todo, find out in which context we have been interrupted: |
503 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
504 | # 2) if we return to kernel code and kvm is enabled check if we need to | |
505 | # modify the psw to leave SIE | |
506 | # 3) if we return to kernel code and preemptive scheduling is enabled check | |
507 | # the preemption counter and if it is zero call preempt_schedule_irq | |
508 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
509 | # |
510 | io_work: | |
c5328901 | 511 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
43d399d2 | 512 | jo io_work_user # yes -> do resched & signal |
43d399d2 | 513 | #ifdef CONFIG_PREEMPT |
2688905e | 514 | # check for preemptive scheduling |
86f2552b | 515 | icm %r0,15,__TI_precount(%r12) |
2688905e | 516 | jnz io_restore # preemption is disabled |
6a2df3a8 MS |
517 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
518 | jno io_restore | |
1da177e4 | 519 | # switch to kernel stack |
c5328901 MS |
520 | lg %r1,__PT_R15(%r11) |
521 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
522 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
523 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
524 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 525 | lgr %r15,%r1 |
6a2df3a8 MS |
526 | # TRACE_IRQS_ON already done at io_return, call |
527 | # TRACE_IRQS_OFF to keep things symmetrical | |
528 | TRACE_IRQS_OFF | |
529 | brasl %r14,preempt_schedule_irq | |
530 | j io_return | |
531 | #else | |
43d399d2 | 532 | j io_restore |
6a2df3a8 | 533 | #endif |
1da177e4 | 534 | |
43d399d2 MS |
535 | # |
536 | # Need to do work before returning to userspace, switch to kernel stack | |
537 | # | |
2688905e | 538 | io_work_user: |
1da177e4 | 539 | lg %r1,__LC_KERNEL_STACK |
c5328901 MS |
540 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
541 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
542 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 543 | lgr %r15,%r1 |
43d399d2 | 544 | |
1da177e4 LT |
545 | # |
546 | # One of the work bits is on. Find out which one. | |
43d399d2 | 547 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
54dfe5dd | 548 | # and _TIF_MCCK_PENDING |
1da177e4 | 549 | # |
6a2df3a8 | 550 | io_work_tif: |
86f2552b | 551 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 552 | jo io_mcck_pending |
86f2552b | 553 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 554 | jo io_reschedule |
86f2552b | 555 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 556 | jo io_sigpending |
86f2552b | 557 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 MS |
558 | jo io_notify_resume |
559 | j io_return # beware of critical section cleanup | |
0eaeafa1 | 560 | |
77fa2245 HC |
561 | # |
562 | # _TIF_MCCK_PENDING is set, call handler | |
563 | # | |
564 | io_mcck_pending: | |
6a2df3a8 | 565 | # TRACE_IRQS_ON already done at io_return |
b771aeac | 566 | brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler |
6a2df3a8 MS |
567 | TRACE_IRQS_OFF |
568 | j io_return | |
77fa2245 | 569 | |
1da177e4 LT |
570 | # |
571 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
572 | # |
573 | io_reschedule: | |
6a2df3a8 | 574 | # TRACE_IRQS_ON already done at io_return |
c5328901 | 575 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 576 | brasl %r14,schedule # call scheduler |
c5328901 | 577 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 578 | TRACE_IRQS_OFF |
6a2df3a8 | 579 | j io_return |
1da177e4 LT |
580 | |
581 | # | |
02a029b3 | 582 | # _TIF_SIGPENDING or is set, call do_signal |
1da177e4 | 583 | # |
25d83cbf | 584 | io_sigpending: |
6a2df3a8 | 585 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
586 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
587 | lgr %r2,%r11 # pass pointer to pt_regs | |
588 | brasl %r14,do_signal | |
589 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
411788ea | 590 | TRACE_IRQS_OFF |
6a2df3a8 | 591 | j io_return |
1da177e4 | 592 | |
753c4dd6 MS |
593 | # |
594 | # _TIF_NOTIFY_RESUME or is set, call do_notify_resume | |
595 | # | |
596 | io_notify_resume: | |
6a2df3a8 | 597 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
598 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
599 | lgr %r2,%r11 # pass pointer to pt_regs | |
600 | brasl %r14,do_notify_resume | |
601 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 602 | TRACE_IRQS_OFF |
6a2df3a8 | 603 | j io_return |
753c4dd6 | 604 | |
1da177e4 LT |
605 | /* |
606 | * External interrupt handler routine | |
607 | */ | |
144d634a | 608 | ENTRY(ext_int_handler) |
473e66ba | 609 | STCK __LC_INT_CLOCK |
9cfb9b3c | 610 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
611 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
612 | lg %r10,__LC_LAST_BREAK | |
613 | lg %r12,__LC_THREAD_INFO | |
614 | larl %r13,system_call | |
615 | lmg %r8,%r9,__LC_EXT_OLD_PSW | |
7c470539 | 616 | HANDLE_SIE_INTERCEPT %r14,3 |
c5328901 MS |
617 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT |
618 | tmhh %r8,0x0001 # interrupting from user ? | |
619 | jz ext_skip | |
620 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
621 | LAST_BREAK %r14 | |
622 | ext_skip: | |
623 | stmg %r0,%r7,__PT_R0(%r11) | |
624 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
625 | stmg %r8,%r9,__PT_PSW(%r11) | |
48f6b00c MS |
626 | lghi %r1,__LC_EXT_PARAMS2 |
627 | mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR | |
628 | mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS | |
629 | mvc __PT_INT_PARM_LONG(8,%r11),0(%r1) | |
1f194a4c | 630 | TRACE_IRQS_OFF |
0de9db37 | 631 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
c5328901 | 632 | lgr %r2,%r11 # pass pointer to pt_regs |
1f44a225 MS |
633 | lghi %r3,EXT_INTERRUPT |
634 | brasl %r14,do_IRQ | |
1da177e4 LT |
635 | j io_return |
636 | ||
4c1051e3 MS |
637 | /* |
638 | * Load idle PSW. The second "half" of this function is in cleanup_idle. | |
639 | */ | |
640 | ENTRY(psw_idle) | |
27f6b416 | 641 | stg %r3,__SF_EMPTY(%r15) |
4c1051e3 MS |
642 | larl %r1,psw_idle_lpsw+4 |
643 | stg %r1,__SF_EMPTY+8(%r15) | |
27f6b416 MS |
644 | STCK __CLOCK_IDLE_ENTER(%r2) |
645 | stpt __TIMER_IDLE_ENTER(%r2) | |
4c1051e3 MS |
646 | psw_idle_lpsw: |
647 | lpswe __SF_EMPTY(%r15) | |
648 | br %r14 | |
649 | psw_idle_end: | |
650 | ||
ae6aa2ea MS |
651 | __critical_end: |
652 | ||
1da177e4 LT |
653 | /* |
654 | * Machine check handler routines | |
655 | */ | |
144d634a | 656 | ENTRY(mcck_int_handler) |
473e66ba | 657 | STCK __LC_MCCK_CLOCK |
77fa2245 HC |
658 | la %r1,4095 # revalidate r1 |
659 | spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer | |
25d83cbf | 660 | lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs |
c5328901 MS |
661 | lg %r10,__LC_LAST_BREAK |
662 | lg %r12,__LC_THREAD_INFO | |
86f2552b | 663 | larl %r13,system_call |
c5328901 | 664 | lmg %r8,%r9,__LC_MCK_OLD_PSW |
7c470539 | 665 | HANDLE_SIE_INTERCEPT %r14,4 |
25d83cbf | 666 | tm __LC_MCCK_CODE,0x80 # system damage? |
c5328901 MS |
667 | jo mcck_panic # yes -> rest of mcck code invalid |
668 | lghi %r14,__LC_CPU_TIMER_SAVE_AREA | |
669 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
63b12246 | 670 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
c5328901 | 671 | jo 3f |
63b12246 MS |
672 | la %r14,__LC_SYNC_ENTER_TIMER |
673 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
674 | jl 0f | |
675 | la %r14,__LC_ASYNC_ENTER_TIMER | |
676 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 677 | jl 1f |
63b12246 | 678 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
679 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
680 | jl 2f | |
63b12246 | 681 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 682 | 2: spt 0(%r14) |
6377981f | 683 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c5328901 MS |
684 | 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
685 | jno mcck_panic # no -> skip cleanup critical | |
686 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT | |
687 | tm %r8,0x0001 # interrupting from user ? | |
688 | jz mcck_skip | |
689 | UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER | |
690 | LAST_BREAK %r14 | |
691 | mcck_skip: | |
6551fbdf MS |
692 | lghi %r14,__LC_GPREGS_SAVE_AREA+64 |
693 | stmg %r0,%r7,__PT_R0(%r11) | |
694 | mvc __PT_R8(64,%r11),0(%r14) | |
c5328901 MS |
695 | stmg %r8,%r9,__PT_PSW(%r11) |
696 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
697 | lgr %r2,%r11 # pass pointer to pt_regs | |
77fa2245 | 698 | brasl %r14,s390_do_machine_check |
c5328901 | 699 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
77fa2245 HC |
700 | jno mcck_return |
701 | lg %r1,__LC_KERNEL_STACK # switch to kernel stack | |
c5328901 MS |
702 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
703 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
704 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
77fa2245 | 705 | lgr %r15,%r1 |
c5328901 | 706 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
86f2552b | 707 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 708 | jno mcck_return |
1f194a4c | 709 | TRACE_IRQS_OFF |
77fa2245 | 710 | brasl %r14,s390_handle_mcck |
1f194a4c | 711 | TRACE_IRQS_ON |
1da177e4 | 712 | mcck_return: |
c5328901 MS |
713 | lg %r14,__LC_VDSO_PER_CPU |
714 | lmg %r0,%r10,__PT_R0(%r11) | |
715 | mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW | |
63b12246 MS |
716 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
717 | jno 0f | |
718 | stpt __LC_EXIT_TIMER | |
c5328901 MS |
719 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
720 | 0: lmg %r11,%r15,__PT_R11(%r11) | |
721 | lpswe __LC_RETURN_MCCK_PSW | |
722 | ||
723 | mcck_panic: | |
724 | lg %r14,__LC_PANIC_STACK | |
725 | slgr %r14,%r15 | |
726 | srag %r14,%r14,PAGE_SHIFT | |
727 | jz 0f | |
728 | lg %r15,__LC_PANIC_STACK | |
729 | 0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
730 | j mcck_skip | |
1da177e4 | 731 | |
7dd6b334 MH |
732 | # |
733 | # PSW restart interrupt handler | |
734 | # | |
8b646bd7 | 735 | ENTRY(restart_int_handler) |
c5328901 | 736 | stg %r15,__LC_SAVE_AREA_RESTART |
8b646bd7 | 737 | lg %r15,__LC_RESTART_STACK |
c5328901 | 738 | aghi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 739 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
740 | stmg %r0,%r14,__PT_R0(%r15) |
741 | mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART | |
742 | mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
743 | aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
744 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
745 | lg %r1,__LC_RESTART_FN # load fn, parm & source cpu |
746 | lg %r2,__LC_RESTART_DATA | |
747 | lg %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
748 | ltgr %r3,%r3 # test source cpu address |
749 | jm 1f # negative -> skip source stop | |
eb546195 | 750 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
751 | brc 10,0b # wait for status stored |
752 | 1: basr %r14,%r1 # call function | |
753 | stap __SF_EMPTY(%r15) # store cpu address | |
754 | llgh %r3,__SF_EMPTY(%r15) | |
eb546195 | 755 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
756 | brc 2,2b |
757 | 3: j 3b | |
7dd6b334 | 758 | |
860dba45 MS |
759 | .section .kprobes.text, "ax" |
760 | ||
1da177e4 LT |
761 | #ifdef CONFIG_CHECK_STACK |
762 | /* | |
763 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
764 | * No need to properly save the registers, we are going to panic anyway. | |
765 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
766 | */ | |
767 | stack_overflow: | |
dc7ee00d MS |
768 | lg %r15,__LC_PANIC_STACK # change to panic stack |
769 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
c5328901 MS |
770 | stmg %r0,%r7,__PT_R0(%r11) |
771 | stmg %r8,%r9,__PT_PSW(%r11) | |
772 | mvc __PT_R8(64,%r11),0(%r14) | |
773 | stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 | |
c5328901 MS |
774 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
775 | lgr %r2,%r11 # pass pointer to pt_regs | |
1da177e4 LT |
776 | jg kernel_stack_overflow |
777 | #endif | |
778 | ||
c5328901 MS |
779 | .align 8 |
780 | cleanup_table: | |
781 | .quad system_call | |
782 | .quad sysc_do_svc | |
783 | .quad sysc_tif | |
784 | .quad sysc_restore | |
785 | .quad sysc_done | |
786 | .quad io_tif | |
787 | .quad io_restore | |
788 | .quad io_done | |
4c1051e3 MS |
789 | .quad psw_idle |
790 | .quad psw_idle_end | |
1da177e4 LT |
791 | |
792 | cleanup_critical: | |
c5328901 | 793 | clg %r9,BASED(cleanup_table) # system_call |
1da177e4 | 794 | jl 0f |
c5328901 | 795 | clg %r9,BASED(cleanup_table+8) # sysc_do_svc |
1da177e4 | 796 | jl cleanup_system_call |
c5328901 | 797 | clg %r9,BASED(cleanup_table+16) # sysc_tif |
1da177e4 | 798 | jl 0f |
c5328901 | 799 | clg %r9,BASED(cleanup_table+24) # sysc_restore |
6a2df3a8 | 800 | jl cleanup_sysc_tif |
c5328901 | 801 | clg %r9,BASED(cleanup_table+32) # sysc_done |
6a2df3a8 | 802 | jl cleanup_sysc_restore |
c5328901 | 803 | clg %r9,BASED(cleanup_table+40) # io_tif |
63b12246 | 804 | jl 0f |
c5328901 | 805 | clg %r9,BASED(cleanup_table+48) # io_restore |
6a2df3a8 | 806 | jl cleanup_io_tif |
c5328901 | 807 | clg %r9,BASED(cleanup_table+56) # io_done |
6a2df3a8 | 808 | jl cleanup_io_restore |
4c1051e3 MS |
809 | clg %r9,BASED(cleanup_table+64) # psw_idle |
810 | jl 0f | |
811 | clg %r9,BASED(cleanup_table+72) # psw_idle_end | |
812 | jl cleanup_idle | |
c5328901 MS |
813 | 0: br %r14 |
814 | ||
1da177e4 LT |
815 | |
816 | cleanup_system_call: | |
c5328901 MS |
817 | # check if stpt has been executed |
818 | clg %r9,BASED(cleanup_system_call_insn) | |
1da177e4 LT |
819 | jh 0f |
820 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
c5328901 | 821 | cghi %r11,__LC_SAVE_AREA_ASYNC |
6377981f | 822 | je 0f |
c5328901 MS |
823 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
824 | 0: # check if stmg has been executed | |
825 | clg %r9,BASED(cleanup_system_call_insn+8) | |
1da177e4 | 826 | jh 0f |
c5328901 MS |
827 | mvc __LC_SAVE_AREA_SYNC(64),0(%r11) |
828 | 0: # check if base register setup + TIF bit load has been done | |
829 | clg %r9,BASED(cleanup_system_call_insn+16) | |
830 | jhe 0f | |
831 | # set up saved registers r10 and r12 | |
832 | stg %r10,16(%r11) # r10 last break | |
833 | stg %r12,32(%r11) # r12 thread-info pointer | |
834 | 0: # check if the user time update has been done | |
835 | clg %r9,BASED(cleanup_system_call_insn+24) | |
836 | jh 0f | |
837 | lg %r15,__LC_EXIT_TIMER | |
838 | slg %r15,__LC_SYNC_ENTER_TIMER | |
839 | alg %r15,__LC_USER_TIMER | |
840 | stg %r15,__LC_USER_TIMER | |
841 | 0: # check if the system time update has been done | |
842 | clg %r9,BASED(cleanup_system_call_insn+32) | |
843 | jh 0f | |
844 | lg %r15,__LC_LAST_UPDATE_TIMER | |
845 | slg %r15,__LC_EXIT_TIMER | |
846 | alg %r15,__LC_SYSTEM_TIMER | |
847 | stg %r15,__LC_SYSTEM_TIMER | |
848 | 0: # update accounting time stamp | |
1da177e4 | 849 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
c5328901 MS |
850 | # do LAST_BREAK |
851 | lg %r9,16(%r11) | |
852 | srag %r9,%r9,23 | |
86f2552b | 853 | jz 0f |
c5328901 MS |
854 | mvc __TI_last_break(8,%r12),16(%r11) |
855 | 0: # set up saved register r11 | |
856 | lg %r15,__LC_KERNEL_STACK | |
dc7ee00d MS |
857 | la %r9,STACK_FRAME_OVERHEAD(%r15) |
858 | stg %r9,24(%r11) # r11 pt_regs pointer | |
c5328901 | 859 | # fill pt_regs |
dc7ee00d MS |
860 | mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC |
861 | stmg %r0,%r7,__PT_R0(%r9) | |
862 | mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW | |
863 | mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC | |
c5328901 | 864 | # setup saved register r15 |
c5328901 MS |
865 | stg %r15,56(%r11) # r15 stack pointer |
866 | # set new psw address and exit | |
867 | larl %r9,sysc_do_svc | |
1da177e4 LT |
868 | br %r14 |
869 | cleanup_system_call_insn: | |
25d83cbf | 870 | .quad system_call |
c5328901 MS |
871 | .quad sysc_stmg |
872 | .quad sysc_per | |
873 | .quad sysc_vtime+18 | |
874 | .quad sysc_vtime+42 | |
1da177e4 | 875 | |
6a2df3a8 | 876 | cleanup_sysc_tif: |
c5328901 | 877 | larl %r9,sysc_tif |
1da177e4 LT |
878 | br %r14 |
879 | ||
6a2df3a8 | 880 | cleanup_sysc_restore: |
c5328901 | 881 | clg %r9,BASED(cleanup_sysc_restore_insn) |
6377981f | 882 | je 0f |
c5328901 MS |
883 | lg %r9,24(%r11) # get saved pointer to pt_regs |
884 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
885 | mvc 0(64,%r11),__PT_R8(%r9) | |
886 | lmg %r0,%r7,__PT_R0(%r9) | |
887 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
1da177e4 | 888 | br %r14 |
6a2df3a8 | 889 | cleanup_sysc_restore_insn: |
411788ea | 890 | .quad sysc_done - 4 |
1da177e4 | 891 | |
6a2df3a8 | 892 | cleanup_io_tif: |
c5328901 | 893 | larl %r9,io_tif |
176b1803 MS |
894 | br %r14 |
895 | ||
6a2df3a8 | 896 | cleanup_io_restore: |
c5328901 MS |
897 | clg %r9,BASED(cleanup_io_restore_insn) |
898 | je 0f | |
899 | lg %r9,24(%r11) # get saved r11 pointer to pt_regs | |
900 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
c5328901 MS |
901 | mvc 0(64,%r11),__PT_R8(%r9) |
902 | lmg %r0,%r7,__PT_R0(%r9) | |
903 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
ae6aa2ea | 904 | br %r14 |
6a2df3a8 | 905 | cleanup_io_restore_insn: |
411788ea | 906 | .quad io_done - 4 |
ae6aa2ea | 907 | |
4c1051e3 MS |
908 | cleanup_idle: |
909 | # copy interrupt clock & cpu timer | |
27f6b416 MS |
910 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK |
911 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER | |
4c1051e3 MS |
912 | cghi %r11,__LC_SAVE_AREA_ASYNC |
913 | je 0f | |
27f6b416 MS |
914 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK |
915 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER | |
4c1051e3 MS |
916 | 0: # check if stck & stpt have been executed |
917 | clg %r9,BASED(cleanup_idle_insn) | |
918 | jhe 1f | |
27f6b416 MS |
919 | mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) |
920 | mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) | |
921 | 1: # account system time going idle | |
4c1051e3 | 922 | lg %r9,__LC_STEAL_TIMER |
27f6b416 | 923 | alg %r9,__CLOCK_IDLE_ENTER(%r2) |
4c1051e3 MS |
924 | slg %r9,__LC_LAST_UPDATE_CLOCK |
925 | stg %r9,__LC_STEAL_TIMER | |
27f6b416 | 926 | mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) |
4c1051e3 MS |
927 | lg %r9,__LC_SYSTEM_TIMER |
928 | alg %r9,__LC_LAST_UPDATE_TIMER | |
27f6b416 | 929 | slg %r9,__TIMER_IDLE_ENTER(%r2) |
4c1051e3 | 930 | stg %r9,__LC_SYSTEM_TIMER |
27f6b416 | 931 | mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) |
4c1051e3 | 932 | # prepare return psw |
0587d409 | 933 | nihh %r8,0xfcfd # clear irq & wait state bits |
4c1051e3 MS |
934 | lg %r9,48(%r11) # return from psw_idle |
935 | br %r14 | |
936 | cleanup_idle_insn: | |
937 | .quad psw_idle_lpsw | |
938 | ||
1da177e4 LT |
939 | /* |
940 | * Integer constants | |
941 | */ | |
c5328901 | 942 | .align 8 |
1da177e4 | 943 | .Lcritical_start: |
c5328901 MS |
944 | .quad __critical_start |
945 | .Lcritical_length: | |
946 | .quad __critical_end - __critical_start | |
947 | ||
1da177e4 | 948 | |
603d1a50 MS |
949 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
950 | /* | |
951 | * sie64a calling convention: | |
952 | * %r2 pointer to sie control block | |
953 | * %r3 guest register save area | |
954 | */ | |
144d634a | 955 | ENTRY(sie64a) |
603d1a50 MS |
956 | stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers |
957 | stg %r2,__SF_EMPTY(%r15) # save control block pointer | |
958 | stg %r3,__SF_EMPTY+8(%r15) # save guest register save area | |
7c470539 | 959 | xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason |
603d1a50 | 960 | lmg %r0,%r13,0(%r3) # load guest gprs 0-13 |
480e5926 CB |
961 | lg %r14,__LC_GMAP # get gmap pointer |
962 | ltgr %r14,%r14 | |
963 | jz sie_gmap | |
964 | lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce | |
965 | sie_gmap: | |
603d1a50 | 966 | lg %r14,__SF_EMPTY(%r15) # get control block pointer |
49b99e1e CB |
967 | oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now |
968 | tm __SIE_PROG20+3(%r14),1 # last exit... | |
969 | jnz sie_done | |
23d18e8d | 970 | LPP __SF_EMPTY(%r15) # set guest id |
603d1a50 MS |
971 | sie 0(%r14) |
972 | sie_done: | |
23d18e8d | 973 | LPP __SF_EMPTY+16(%r15) # set host id |
95d38fd0 | 974 | ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE |
480e5926 | 975 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
7c470539 MS |
976 | # some program checks are suppressing. C code (e.g. do_protection_exception) |
977 | # will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other | |
978 | # instructions beween sie64a and sie_done should not cause program | |
979 | # interrupts. So lets use a nop (47 00 00 00) as a landing pad. | |
980 | # See also HANDLE_SIE_INTERCEPT | |
981 | rewind_pad: | |
982 | nop 0 | |
b764bb1c | 983 | .globl sie_exit |
7c470539 | 984 | sie_exit: |
603d1a50 MS |
985 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
986 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
987 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
7c470539 | 988 | lg %r2,__SF_EMPTY+24(%r15) # return exit reason code |
603d1a50 MS |
989 | br %r14 |
990 | sie_fault: | |
7c470539 MS |
991 | lghi %r14,-EFAULT |
992 | stg %r14,__SF_EMPTY+24(%r15) # set exit reason code | |
993 | j sie_exit | |
603d1a50 MS |
994 | |
995 | .align 8 | |
7c470539 MS |
996 | .Lsie_critical: |
997 | .quad sie_gmap | |
998 | .Lsie_critical_length: | |
999 | .quad sie_done - sie_gmap | |
603d1a50 | 1000 | |
ce6a04ac | 1001 | EX_TABLE(rewind_pad,sie_fault) |
7c470539 | 1002 | EX_TABLE(sie_exit,sie_fault) |
603d1a50 MS |
1003 | #endif |
1004 | ||
25d83cbf | 1005 | .section .rodata, "a" |
1da177e4 | 1006 | #define SYSCALL(esa,esame,emu) .long esame |
9bf1226b | 1007 | .globl sys_call_table |
1da177e4 LT |
1008 | sys_call_table: |
1009 | #include "syscalls.S" | |
1010 | #undef SYSCALL | |
1011 | ||
347a8dc3 | 1012 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
1013 | |
1014 | #define SYSCALL(esa,esame,emu) .long emu | |
61649881 | 1015 | .globl sys_call_table_emu |
1da177e4 LT |
1016 | sys_call_table_emu: |
1017 | #include "syscalls.S" | |
1018 | #undef SYSCALL | |
1019 | #endif |