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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> |
1da177e4 | 22 | |
c5328901 MS |
23 | __PT_R0 = __PT_GPRS |
24 | __PT_R1 = __PT_GPRS + 8 | |
25 | __PT_R2 = __PT_GPRS + 16 | |
26 | __PT_R3 = __PT_GPRS + 24 | |
27 | __PT_R4 = __PT_GPRS + 32 | |
28 | __PT_R5 = __PT_GPRS + 40 | |
29 | __PT_R6 = __PT_GPRS + 48 | |
30 | __PT_R7 = __PT_GPRS + 56 | |
31 | __PT_R8 = __PT_GPRS + 64 | |
32 | __PT_R9 = __PT_GPRS + 72 | |
33 | __PT_R10 = __PT_GPRS + 80 | |
34 | __PT_R11 = __PT_GPRS + 88 | |
35 | __PT_R12 = __PT_GPRS + 96 | |
36 | __PT_R13 = __PT_GPRS + 104 | |
37 | __PT_R14 = __PT_GPRS + 112 | |
38 | __PT_R15 = __PT_GPRS + 120 | |
1da177e4 LT |
39 | |
40 | STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER | |
41 | STACK_SIZE = 1 << STACK_SHIFT | |
dc7ee00d | 42 | STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE |
1da177e4 | 43 | |
753c4dd6 | 44 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
b6ef5bb3 | 45 | _TIF_MCCK_PENDING | _TIF_PER_TRAP ) |
753c4dd6 | 46 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 47 | _TIF_MCCK_PENDING) |
b6ef5bb3 MS |
48 | _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
49 | _TIF_SYSCALL_TRACEPOINT) | |
1da177e4 LT |
50 | |
51 | #define BASED(name) name-system_call(%r13) | |
52 | ||
1f194a4c | 53 | .macro TRACE_IRQS_ON |
c5328901 | 54 | #ifdef CONFIG_TRACE_IRQFLAGS |
6a2df3a8 MS |
55 | basr %r2,%r0 |
56 | brasl %r14,trace_hardirqs_on_caller | |
c5328901 | 57 | #endif |
1f194a4c HC |
58 | .endm |
59 | ||
60 | .macro TRACE_IRQS_OFF | |
c5328901 | 61 | #ifdef CONFIG_TRACE_IRQFLAGS |
6a2df3a8 MS |
62 | basr %r2,%r0 |
63 | brasl %r14,trace_hardirqs_off_caller | |
411788ea | 64 | #endif |
c5328901 | 65 | .endm |
411788ea | 66 | |
411788ea | 67 | .macro LOCKDEP_SYS_EXIT |
c5328901 MS |
68 | #ifdef CONFIG_LOCKDEP |
69 | tm __PT_PSW+1(%r11),0x01 # returning to user ? | |
70 | jz .+10 | |
411788ea | 71 | brasl %r14,lockdep_sys_exit |
1f194a4c | 72 | #endif |
1da177e4 | 73 | .endm |
1da177e4 | 74 | |
23d18e8d | 75 | .macro LPP newpp |
c5328901 | 76 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
23d18e8d | 77 | tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_LPP |
c5328901 MS |
78 | jz .+8 |
79 | .insn s,0xb2800000,\newpp | |
80 | #endif | |
81 | .endm | |
1da177e4 | 82 | |
7c470539 | 83 | .macro HANDLE_SIE_INTERCEPT scratch,reason |
c5328901 | 84 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
6022afc0 | 85 | tmhh %r8,0x0001 # interrupting from user ? |
7c470539 | 86 | jnz .+62 |
c5328901 | 87 | lgr \scratch,%r9 |
7c470539 MS |
88 | slg \scratch,BASED(.Lsie_critical) |
89 | clg \scratch,BASED(.Lsie_critical_length) | |
90 | .if \reason==1 | |
ce6a04ac CB |
91 | # Some program interrupts are suppressing (e.g. protection). |
92 | # We must also check the instruction after SIE in that case. | |
93 | # do_protection_exception will rewind to rewind_pad | |
7c470539 | 94 | jh .+42 |
ce6a04ac | 95 | .else |
7c470539 | 96 | jhe .+42 |
ce6a04ac | 97 | .endif |
7c470539 MS |
98 | lg %r14,__SF_EMPTY(%r15) # get control block pointer |
99 | LPP __SF_EMPTY+16(%r15) # set host id | |
95d38fd0 | 100 | ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE |
7c470539 MS |
101 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
102 | larl %r9,sie_exit # skip forward to sie_exit | |
103 | mvi __SF_EMPTY+31(%r15),\reason # set exit reason | |
c5328901 | 104 | #endif |
987ad70a MS |
105 | .endm |
106 | ||
c5328901 | 107 | .macro CHECK_STACK stacksize,savearea |
63b12246 | 108 | #ifdef CONFIG_CHECK_STACK |
c5328901 MS |
109 | tml %r15,\stacksize - CONFIG_STACK_GUARD |
110 | lghi %r14,\savearea | |
111 | jz stack_overflow | |
63b12246 | 112 | #endif |
63b12246 MS |
113 | .endm |
114 | ||
c5328901 MS |
115 | .macro SWITCH_ASYNC savearea,stack,shift |
116 | tmhh %r8,0x0001 # interrupting from user ? | |
117 | jnz 1f | |
118 | lgr %r14,%r9 | |
119 | slg %r14,BASED(.Lcritical_start) | |
120 | clg %r14,BASED(.Lcritical_length) | |
1da177e4 | 121 | jhe 0f |
c5328901 | 122 | lghi %r11,\savearea # inside critical section, do cleanup |
1da177e4 | 123 | brasl %r14,cleanup_critical |
c5328901 | 124 | tmhh %r8,0x0001 # retest problem state after cleanup |
1da177e4 | 125 | jnz 1f |
c5328901 | 126 | 0: lg %r14,\stack # are we already on the target stack? |
1da177e4 | 127 | slgr %r14,%r15 |
c5328901 | 128 | srag %r14,%r14,\shift |
86f2552b | 129 | jnz 1f |
c5328901 | 130 | CHECK_STACK 1<<\shift,\savearea |
dc7ee00d | 131 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
c5328901 MS |
132 | j 2f |
133 | 1: lg %r15,\stack # load target stack | |
dc7ee00d | 134 | 2: la %r11,STACK_FRAME_OVERHEAD(%r15) |
25d83cbf | 135 | .endm |
1da177e4 | 136 | |
c5328901 MS |
137 | .macro UPDATE_VTIME scratch,enter_timer |
138 | lg \scratch,__LC_EXIT_TIMER | |
139 | slg \scratch,\enter_timer | |
140 | alg \scratch,__LC_USER_TIMER | |
141 | stg \scratch,__LC_USER_TIMER | |
142 | lg \scratch,__LC_LAST_UPDATE_TIMER | |
143 | slg \scratch,__LC_EXIT_TIMER | |
144 | alg \scratch,__LC_SYSTEM_TIMER | |
145 | stg \scratch,__LC_SYSTEM_TIMER | |
146 | mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer | |
1da177e4 LT |
147 | .endm |
148 | ||
c5328901 MS |
149 | .macro LAST_BREAK scratch |
150 | srag \scratch,%r10,23 | |
151 | jz .+10 | |
152 | stg %r10,__TI_last_break(%r12) | |
86f2552b MS |
153 | .endm |
154 | ||
1e54622e | 155 | .macro REENABLE_IRQS |
c5328901 MS |
156 | stg %r8,__LC_RETURN_PSW |
157 | ni __LC_RETURN_PSW,0xbf | |
158 | ssm __LC_RETURN_PSW | |
1e54622e MS |
159 | .endm |
160 | ||
473e66ba | 161 | .macro STCK savearea |
d652d596 | 162 | #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES |
473e66ba HC |
163 | .insn s,0xb27c0000,\savearea # store clock fast |
164 | #else | |
165 | .insn s,0xb2050000,\savearea # store clock | |
166 | #endif | |
167 | .endm | |
168 | ||
860dba45 MS |
169 | .section .kprobes.text, "ax" |
170 | ||
1da177e4 LT |
171 | /* |
172 | * Scheduler resume function, called by switch_to | |
173 | * gpr2 = (task_struct *) prev | |
174 | * gpr3 = (task_struct *) next | |
175 | * Returns: | |
176 | * gpr2 = prev | |
177 | */ | |
144d634a | 178 | ENTRY(__switch_to) |
eda0c6d6 MS |
179 | stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
180 | stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev | |
5e9a2692 MS |
181 | lg %r4,__THREAD_info(%r2) # get thread_info of prev |
182 | lg %r5,__THREAD_info(%r3) # get thread_info of next | |
eda0c6d6 | 183 | lgr %r15,%r5 |
dc7ee00d | 184 | aghi %r15,STACK_INIT # end of kernel stack of next |
eda0c6d6 MS |
185 | stg %r3,__LC_CURRENT # store task struct of next |
186 | stg %r5,__LC_THREAD_INFO # store thread info of next | |
187 | stg %r15,__LC_KERNEL_STACK # store end of kernel stack | |
188 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
189 | mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next | |
190 | lg %r15,__THREAD_ksp(%r3) # load kernel stack of next | |
77fa2245 | 191 | tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending? |
5e9a2692 MS |
192 | jz 0f |
193 | ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
194 | oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next | |
eda0c6d6 | 195 | 0: lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
1da177e4 LT |
196 | br %r14 |
197 | ||
198 | __critical_start: | |
199 | /* | |
200 | * SVC interrupt handler routine. System calls are synchronous events and | |
201 | * are executed with interrupts enabled. | |
202 | */ | |
203 | ||
144d634a | 204 | ENTRY(system_call) |
c185b783 | 205 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
206 | sysc_stmg: |
207 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC | |
208 | lg %r10,__LC_LAST_BREAK | |
209 | lg %r12,__LC_THREAD_INFO | |
c5328901 MS |
210 | sysc_per: |
211 | lg %r15,__LC_KERNEL_STACK | |
c5328901 | 212 | la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs |
1da177e4 | 213 | sysc_vtime: |
c5328901 MS |
214 | UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER |
215 | LAST_BREAK %r13 | |
216 | stmg %r0,%r7,__PT_R0(%r11) | |
217 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
218 | mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW | |
aa33c8cb | 219 | mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
1da177e4 | 220 | sysc_do_svc: |
c5328901 | 221 | oi __TI_flags+7(%r12),_TIF_SYSCALL |
61649881 | 222 | lg %r10,__TI_sysc_table(%r12) # address of system call table |
aa33c8cb | 223 | llgh %r8,__PT_INT_CODE+2(%r11) |
c5328901 | 224 | slag %r8,%r8,2 # shift and test for svc 0 |
1da177e4 LT |
225 | jnz sysc_nr_ok |
226 | # svc 0: system call number in %r1 | |
c5328901 | 227 | llgfr %r1,%r1 # clear high word in r1 |
86f2552b | 228 | cghi %r1,NR_syscalls |
1da177e4 | 229 | jnl sysc_nr_ok |
aa33c8cb | 230 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 | 231 | slag %r8,%r1,2 |
1da177e4 | 232 | sysc_nr_ok: |
c5328901 MS |
233 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
234 | stg %r2,__PT_ORIG_GPR2(%r11) | |
235 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
236 | lgf %r9,0(%r8,%r10) # get system call add. | |
b6ef5bb3 | 237 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 238 | jnz sysc_tracesys |
c5328901 MS |
239 | basr %r14,%r9 # call sys_xxxx |
240 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 LT |
241 | |
242 | sysc_return: | |
6a2df3a8 MS |
243 | LOCKDEP_SYS_EXIT |
244 | sysc_tif: | |
c5328901 | 245 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
b6ef5bb3 | 246 | jno sysc_restore |
86f2552b | 247 | tm __TI_flags+7(%r12),_TIF_WORK_SVC |
c5328901 | 248 | jnz sysc_work # check for work |
b6ef5bb3 | 249 | ni __TI_flags+7(%r12),255-_TIF_SYSCALL |
411788ea | 250 | sysc_restore: |
c5328901 MS |
251 | lg %r14,__LC_VDSO_PER_CPU |
252 | lmg %r0,%r10,__PT_R0(%r11) | |
253 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
254 | stpt __LC_EXIT_TIMER | |
255 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
256 | lmg %r11,%r15,__PT_R11(%r11) | |
257 | lpswe __LC_RETURN_PSW | |
411788ea HC |
258 | sysc_done: |
259 | ||
43d399d2 MS |
260 | # |
261 | # One of the work bits is on. Find out which one. | |
262 | # | |
b6ef5bb3 | 263 | sysc_work: |
86f2552b | 264 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 265 | jo sysc_mcck_pending |
86f2552b | 266 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 267 | jo sysc_reschedule |
39efd4ec MS |
268 | tm __TI_flags+7(%r12),_TIF_PER_TRAP |
269 | jo sysc_singlestep | |
86f2552b | 270 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 271 | jo sysc_sigpending |
86f2552b | 272 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 | 273 | jo sysc_notify_resume |
43d399d2 | 274 | j sysc_return # beware of critical section cleanup |
1da177e4 LT |
275 | |
276 | # | |
277 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
278 | # |
279 | sysc_reschedule: | |
6a2df3a8 | 280 | larl %r14,sysc_return |
c5328901 | 281 | jg schedule |
1da177e4 | 282 | |
77fa2245 HC |
283 | # |
284 | # _TIF_MCCK_PENDING is set, call handler | |
285 | # | |
286 | sysc_mcck_pending: | |
6a2df3a8 | 287 | larl %r14,sysc_return |
25d83cbf | 288 | jg s390_handle_mcck # TIF bit will be cleared by handler |
77fa2245 | 289 | |
1da177e4 | 290 | # |
02a029b3 | 291 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 292 | # |
25d83cbf | 293 | sysc_sigpending: |
c5328901 MS |
294 | lgr %r2,%r11 # pass pointer to pt_regs |
295 | brasl %r14,do_signal | |
b6ef5bb3 MS |
296 | tm __TI_flags+7(%r12),_TIF_SYSCALL |
297 | jno sysc_return | |
c5328901 MS |
298 | lmg %r2,%r7,__PT_R2(%r11) # load svc arguments |
299 | lghi %r8,0 # svc 0 returns -ENOSYS | |
450e47da | 300 | llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number |
b6ef5bb3 MS |
301 | cghi %r1,NR_syscalls |
302 | jnl sysc_nr_ok # invalid svc number -> do svc 0 | |
c5328901 | 303 | slag %r8,%r1,2 |
b6ef5bb3 | 304 | j sysc_nr_ok # restart svc |
1da177e4 | 305 | |
753c4dd6 MS |
306 | # |
307 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
308 | # | |
309 | sysc_notify_resume: | |
c5328901 | 310 | lgr %r2,%r11 # pass pointer to pt_regs |
6a2df3a8 | 311 | larl %r14,sysc_return |
c5328901 | 312 | jg do_notify_resume |
753c4dd6 | 313 | |
1da177e4 | 314 | # |
5e9a2692 | 315 | # _TIF_PER_TRAP is set, call do_per_trap |
1da177e4 LT |
316 | # |
317 | sysc_singlestep: | |
39efd4ec | 318 | ni __TI_flags+7(%r12),255-_TIF_PER_TRAP |
c5328901 MS |
319 | lgr %r2,%r11 # pass pointer to pt_regs |
320 | larl %r14,sysc_return | |
5e9a2692 | 321 | jg do_per_trap |
1da177e4 | 322 | |
1da177e4 | 323 | # |
753c4dd6 MS |
324 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
325 | # and after the system call | |
1da177e4 LT |
326 | # |
327 | sysc_tracesys: | |
c5328901 | 328 | lgr %r2,%r11 # pass pointer to pt_regs |
1da177e4 | 329 | la %r3,0 |
aa33c8cb | 330 | llgh %r0,__PT_INT_CODE+2(%r11) |
c5328901 | 331 | stg %r0,__PT_R2(%r11) |
753c4dd6 | 332 | brasl %r14,do_syscall_trace_enter |
1da177e4 | 333 | lghi %r0,NR_syscalls |
753c4dd6 | 334 | clgr %r0,%r2 |
1da177e4 | 335 | jnh sysc_tracenogo |
c5328901 MS |
336 | sllg %r8,%r2,2 |
337 | lgf %r9,0(%r8,%r10) | |
1da177e4 | 338 | sysc_tracego: |
c5328901 MS |
339 | lmg %r3,%r7,__PT_R3(%r11) |
340 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
341 | lg %r2,__PT_ORIG_GPR2(%r11) | |
342 | basr %r14,%r9 # call sys_xxx | |
343 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 | 344 | sysc_tracenogo: |
b6ef5bb3 | 345 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 346 | jz sysc_return |
c5328901 MS |
347 | lgr %r2,%r11 # pass pointer to pt_regs |
348 | larl %r14,sysc_return | |
753c4dd6 | 349 | jg do_syscall_trace_exit |
1da177e4 LT |
350 | |
351 | # | |
352 | # a new process exits the kernel with ret_from_fork | |
353 | # | |
144d634a | 354 | ENTRY(ret_from_fork) |
c5328901 MS |
355 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
356 | lg %r12,__LC_THREAD_INFO | |
37fe5d41 AV |
357 | brasl %r14,schedule_tail |
358 | TRACE_IRQS_ON | |
359 | ssm __LC_SVC_NEW_PSW # reenable interrupts | |
30dcb099 AV |
360 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? |
361 | jne sysc_tracenogo | |
362 | # it's a kernel thread | |
363 | lmg %r9,%r10,__PT_R9(%r11) # load gprs | |
37fe5d41 AV |
364 | ENTRY(kernel_thread_starter) |
365 | la %r2,0(%r10) | |
366 | basr %r14,%r9 | |
30dcb099 | 367 | j sysc_tracenogo |
1da177e4 LT |
368 | |
369 | /* | |
370 | * Program check handler routine | |
371 | */ | |
372 | ||
144d634a | 373 | ENTRY(pgm_check_handler) |
c185b783 | 374 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
375 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
376 | lg %r10,__LC_LAST_BREAK | |
377 | lg %r12,__LC_THREAD_INFO | |
378 | larl %r13,system_call | |
379 | lmg %r8,%r9,__LC_PGM_OLD_PSW | |
ce6a04ac | 380 | HANDLE_SIE_INTERCEPT %r14,1 |
c5328901 MS |
381 | tmhh %r8,0x0001 # test problem state bit |
382 | jnz 1f # -> fault in user space | |
383 | tmhh %r8,0x4000 # PER bit set in old PSW ? | |
384 | jnz 0f # -> enabled, can't be a double fault | |
385 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
386 | jnz pgm_svcper # -> single stepped svc | |
387 | 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC | |
dc7ee00d | 388 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
c5328901 MS |
389 | j 2f |
390 | 1: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER | |
391 | LAST_BREAK %r14 | |
392 | lg %r15,__LC_KERNEL_STACK | |
d35339a4 MS |
393 | lg %r14,__TI_task(%r12) |
394 | lghi %r13,__LC_PGM_TDB | |
395 | tm __LC_PGM_ILC+2,0x02 # check for transaction abort | |
396 | jz 2f | |
397 | mvc __THREAD_trap_tdb(256,%r14),0(%r13) | |
dc7ee00d | 398 | 2: la %r11,STACK_FRAME_OVERHEAD(%r15) |
c5328901 MS |
399 | stmg %r0,%r7,__PT_R0(%r11) |
400 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
401 | stmg %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
402 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
403 | mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE | |
c5328901 MS |
404 | stg %r10,__PT_ARGS(%r11) |
405 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
406 | jz 0f | |
c5328901 MS |
407 | tmhh %r8,0x0001 # kernel per event ? |
408 | jz pgm_kprobe | |
409 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
d35339a4 MS |
410 | mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS |
411 | mvc __THREAD_per_cause(2,%r14),__LC_PER_CAUSE | |
412 | mvc __THREAD_per_paid(1,%r14),__LC_PER_PAID | |
aa33c8cb | 413 | 0: REENABLE_IRQS |
c5328901 | 414 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f5cdac27 | 415 | larl %r1,pgm_check_table |
aa33c8cb MS |
416 | llgh %r10,__PT_INT_CODE+2(%r11) |
417 | nill %r10,0x007f | |
b01a37a7 | 418 | sll %r10,2 |
aa33c8cb | 419 | je sysc_return |
b01a37a7 | 420 | lgf %r1,0(%r10,%r1) # load address of handler routine |
c5328901 | 421 | lgr %r2,%r11 # pass pointer to pt_regs |
f5cdac27 | 422 | basr %r14,%r1 # branch to interrupt-handler |
f5cdac27 | 423 | j sysc_return |
1da177e4 LT |
424 | |
425 | # | |
c5328901 | 426 | # PER event in supervisor state, must be kprobes |
1da177e4 | 427 | # |
c5328901 MS |
428 | pgm_kprobe: |
429 | REENABLE_IRQS | |
430 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
431 | lgr %r2,%r11 # pass pointer to pt_regs | |
432 | brasl %r14,do_per_trap | |
433 | j sysc_return | |
1da177e4 | 434 | |
4ba069b8 | 435 | # |
c5328901 | 436 | # single stepped system call |
4ba069b8 | 437 | # |
c5328901 MS |
438 | pgm_svcper: |
439 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
440 | mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW | |
441 | larl %r14,sysc_per | |
442 | stg %r14,__LC_RETURN_PSW+8 | |
443 | lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs | |
4ba069b8 | 444 | |
1da177e4 LT |
445 | /* |
446 | * IO interrupt handler routine | |
447 | */ | |
144d634a | 448 | ENTRY(io_int_handler) |
473e66ba | 449 | STCK __LC_INT_CLOCK |
9cfb9b3c | 450 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
451 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
452 | lg %r10,__LC_LAST_BREAK | |
453 | lg %r12,__LC_THREAD_INFO | |
454 | larl %r13,system_call | |
455 | lmg %r8,%r9,__LC_IO_OLD_PSW | |
7c470539 | 456 | HANDLE_SIE_INTERCEPT %r14,2 |
c5328901 MS |
457 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT |
458 | tmhh %r8,0x0001 # interrupting from user? | |
459 | jz io_skip | |
460 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
461 | LAST_BREAK %r14 | |
462 | io_skip: | |
463 | stmg %r0,%r7,__PT_R0(%r11) | |
464 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
465 | stmg %r8,%r9,__PT_PSW(%r11) | |
48f6b00c | 466 | mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID |
1f194a4c | 467 | TRACE_IRQS_OFF |
c5328901 | 468 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
48f6b00c | 469 | io_loop: |
c5328901 MS |
470 | lgr %r2,%r11 # pass pointer to pt_regs |
471 | brasl %r14,do_IRQ | |
48f6b00c MS |
472 | tm __LC_MACHINE_FLAGS+6,0x10 # MACHINE_FLAG_LPAR |
473 | jz io_return | |
474 | tpi 0 | |
475 | jz io_return | |
476 | mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID | |
477 | j io_loop | |
1da177e4 | 478 | io_return: |
6a2df3a8 MS |
479 | LOCKDEP_SYS_EXIT |
480 | TRACE_IRQS_ON | |
481 | io_tif: | |
86f2552b | 482 | tm __TI_flags+7(%r12),_TIF_WORK_INT |
25d83cbf | 483 | jnz io_work # there is work to do (signals etc.) |
411788ea | 484 | io_restore: |
c5328901 MS |
485 | lg %r14,__LC_VDSO_PER_CPU |
486 | lmg %r0,%r10,__PT_R0(%r11) | |
487 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
c5328901 MS |
488 | stpt __LC_EXIT_TIMER |
489 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
490 | lmg %r11,%r15,__PT_R11(%r11) | |
491 | lpswe __LC_RETURN_PSW | |
ae6aa2ea | 492 | io_done: |
1da177e4 | 493 | |
2688905e | 494 | # |
43d399d2 MS |
495 | # There is work todo, find out in which context we have been interrupted: |
496 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
497 | # 2) if we return to kernel code and kvm is enabled check if we need to | |
498 | # modify the psw to leave SIE | |
499 | # 3) if we return to kernel code and preemptive scheduling is enabled check | |
500 | # the preemption counter and if it is zero call preempt_schedule_irq | |
501 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
502 | # |
503 | io_work: | |
c5328901 | 504 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
43d399d2 | 505 | jo io_work_user # yes -> do resched & signal |
43d399d2 | 506 | #ifdef CONFIG_PREEMPT |
2688905e | 507 | # check for preemptive scheduling |
86f2552b | 508 | icm %r0,15,__TI_precount(%r12) |
2688905e | 509 | jnz io_restore # preemption is disabled |
6a2df3a8 MS |
510 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
511 | jno io_restore | |
1da177e4 | 512 | # switch to kernel stack |
c5328901 MS |
513 | lg %r1,__PT_R15(%r11) |
514 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
515 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
516 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
517 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 518 | lgr %r15,%r1 |
6a2df3a8 MS |
519 | # TRACE_IRQS_ON already done at io_return, call |
520 | # TRACE_IRQS_OFF to keep things symmetrical | |
521 | TRACE_IRQS_OFF | |
522 | brasl %r14,preempt_schedule_irq | |
523 | j io_return | |
524 | #else | |
43d399d2 | 525 | j io_restore |
6a2df3a8 | 526 | #endif |
1da177e4 | 527 | |
43d399d2 MS |
528 | # |
529 | # Need to do work before returning to userspace, switch to kernel stack | |
530 | # | |
2688905e | 531 | io_work_user: |
1da177e4 | 532 | lg %r1,__LC_KERNEL_STACK |
c5328901 MS |
533 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
534 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
535 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 536 | lgr %r15,%r1 |
43d399d2 | 537 | |
1da177e4 LT |
538 | # |
539 | # One of the work bits is on. Find out which one. | |
43d399d2 | 540 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
54dfe5dd | 541 | # and _TIF_MCCK_PENDING |
1da177e4 | 542 | # |
6a2df3a8 | 543 | io_work_tif: |
86f2552b | 544 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 545 | jo io_mcck_pending |
86f2552b | 546 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 547 | jo io_reschedule |
86f2552b | 548 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 549 | jo io_sigpending |
86f2552b | 550 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 MS |
551 | jo io_notify_resume |
552 | j io_return # beware of critical section cleanup | |
0eaeafa1 | 553 | |
77fa2245 HC |
554 | # |
555 | # _TIF_MCCK_PENDING is set, call handler | |
556 | # | |
557 | io_mcck_pending: | |
6a2df3a8 | 558 | # TRACE_IRQS_ON already done at io_return |
b771aeac | 559 | brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler |
6a2df3a8 MS |
560 | TRACE_IRQS_OFF |
561 | j io_return | |
77fa2245 | 562 | |
1da177e4 LT |
563 | # |
564 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
565 | # |
566 | io_reschedule: | |
6a2df3a8 | 567 | # TRACE_IRQS_ON already done at io_return |
c5328901 | 568 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 569 | brasl %r14,schedule # call scheduler |
c5328901 | 570 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 571 | TRACE_IRQS_OFF |
6a2df3a8 | 572 | j io_return |
1da177e4 LT |
573 | |
574 | # | |
02a029b3 | 575 | # _TIF_SIGPENDING or is set, call do_signal |
1da177e4 | 576 | # |
25d83cbf | 577 | io_sigpending: |
6a2df3a8 | 578 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
579 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
580 | lgr %r2,%r11 # pass pointer to pt_regs | |
581 | brasl %r14,do_signal | |
582 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
411788ea | 583 | TRACE_IRQS_OFF |
6a2df3a8 | 584 | j io_return |
1da177e4 | 585 | |
753c4dd6 MS |
586 | # |
587 | # _TIF_NOTIFY_RESUME or is set, call do_notify_resume | |
588 | # | |
589 | io_notify_resume: | |
6a2df3a8 | 590 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
591 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
592 | lgr %r2,%r11 # pass pointer to pt_regs | |
593 | brasl %r14,do_notify_resume | |
594 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 595 | TRACE_IRQS_OFF |
6a2df3a8 | 596 | j io_return |
753c4dd6 | 597 | |
1da177e4 LT |
598 | /* |
599 | * External interrupt handler routine | |
600 | */ | |
144d634a | 601 | ENTRY(ext_int_handler) |
473e66ba | 602 | STCK __LC_INT_CLOCK |
9cfb9b3c | 603 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
604 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
605 | lg %r10,__LC_LAST_BREAK | |
606 | lg %r12,__LC_THREAD_INFO | |
607 | larl %r13,system_call | |
608 | lmg %r8,%r9,__LC_EXT_OLD_PSW | |
7c470539 | 609 | HANDLE_SIE_INTERCEPT %r14,3 |
c5328901 MS |
610 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT |
611 | tmhh %r8,0x0001 # interrupting from user ? | |
612 | jz ext_skip | |
613 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
614 | LAST_BREAK %r14 | |
615 | ext_skip: | |
616 | stmg %r0,%r7,__PT_R0(%r11) | |
617 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
618 | stmg %r8,%r9,__PT_PSW(%r11) | |
48f6b00c MS |
619 | lghi %r1,__LC_EXT_PARAMS2 |
620 | mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR | |
621 | mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS | |
622 | mvc __PT_INT_PARM_LONG(8,%r11),0(%r1) | |
1f194a4c | 623 | TRACE_IRQS_OFF |
0de9db37 | 624 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
c5328901 | 625 | lgr %r2,%r11 # pass pointer to pt_regs |
25d83cbf | 626 | brasl %r14,do_extint |
1da177e4 LT |
627 | j io_return |
628 | ||
4c1051e3 MS |
629 | /* |
630 | * Load idle PSW. The second "half" of this function is in cleanup_idle. | |
631 | */ | |
632 | ENTRY(psw_idle) | |
27f6b416 | 633 | stg %r3,__SF_EMPTY(%r15) |
4c1051e3 MS |
634 | larl %r1,psw_idle_lpsw+4 |
635 | stg %r1,__SF_EMPTY+8(%r15) | |
27f6b416 MS |
636 | STCK __CLOCK_IDLE_ENTER(%r2) |
637 | stpt __TIMER_IDLE_ENTER(%r2) | |
4c1051e3 MS |
638 | psw_idle_lpsw: |
639 | lpswe __SF_EMPTY(%r15) | |
640 | br %r14 | |
641 | psw_idle_end: | |
642 | ||
ae6aa2ea MS |
643 | __critical_end: |
644 | ||
1da177e4 LT |
645 | /* |
646 | * Machine check handler routines | |
647 | */ | |
144d634a | 648 | ENTRY(mcck_int_handler) |
473e66ba | 649 | STCK __LC_MCCK_CLOCK |
77fa2245 HC |
650 | la %r1,4095 # revalidate r1 |
651 | spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer | |
25d83cbf | 652 | lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs |
c5328901 MS |
653 | lg %r10,__LC_LAST_BREAK |
654 | lg %r12,__LC_THREAD_INFO | |
86f2552b | 655 | larl %r13,system_call |
c5328901 | 656 | lmg %r8,%r9,__LC_MCK_OLD_PSW |
7c470539 | 657 | HANDLE_SIE_INTERCEPT %r14,4 |
25d83cbf | 658 | tm __LC_MCCK_CODE,0x80 # system damage? |
c5328901 MS |
659 | jo mcck_panic # yes -> rest of mcck code invalid |
660 | lghi %r14,__LC_CPU_TIMER_SAVE_AREA | |
661 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
63b12246 | 662 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
c5328901 | 663 | jo 3f |
63b12246 MS |
664 | la %r14,__LC_SYNC_ENTER_TIMER |
665 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
666 | jl 0f | |
667 | la %r14,__LC_ASYNC_ENTER_TIMER | |
668 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 669 | jl 1f |
63b12246 | 670 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
671 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
672 | jl 2f | |
63b12246 | 673 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 674 | 2: spt 0(%r14) |
6377981f | 675 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c5328901 MS |
676 | 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
677 | jno mcck_panic # no -> skip cleanup critical | |
678 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT | |
679 | tm %r8,0x0001 # interrupting from user ? | |
680 | jz mcck_skip | |
681 | UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER | |
682 | LAST_BREAK %r14 | |
683 | mcck_skip: | |
6551fbdf MS |
684 | lghi %r14,__LC_GPREGS_SAVE_AREA+64 |
685 | stmg %r0,%r7,__PT_R0(%r11) | |
686 | mvc __PT_R8(64,%r11),0(%r14) | |
c5328901 MS |
687 | stmg %r8,%r9,__PT_PSW(%r11) |
688 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
689 | lgr %r2,%r11 # pass pointer to pt_regs | |
77fa2245 | 690 | brasl %r14,s390_do_machine_check |
c5328901 | 691 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
77fa2245 HC |
692 | jno mcck_return |
693 | lg %r1,__LC_KERNEL_STACK # switch to kernel stack | |
c5328901 MS |
694 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
695 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
696 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
77fa2245 | 697 | lgr %r15,%r1 |
c5328901 | 698 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
86f2552b | 699 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 700 | jno mcck_return |
1f194a4c | 701 | TRACE_IRQS_OFF |
77fa2245 | 702 | brasl %r14,s390_handle_mcck |
1f194a4c | 703 | TRACE_IRQS_ON |
1da177e4 | 704 | mcck_return: |
c5328901 MS |
705 | lg %r14,__LC_VDSO_PER_CPU |
706 | lmg %r0,%r10,__PT_R0(%r11) | |
707 | mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW | |
63b12246 MS |
708 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
709 | jno 0f | |
710 | stpt __LC_EXIT_TIMER | |
c5328901 MS |
711 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
712 | 0: lmg %r11,%r15,__PT_R11(%r11) | |
713 | lpswe __LC_RETURN_MCCK_PSW | |
714 | ||
715 | mcck_panic: | |
716 | lg %r14,__LC_PANIC_STACK | |
717 | slgr %r14,%r15 | |
718 | srag %r14,%r14,PAGE_SHIFT | |
719 | jz 0f | |
720 | lg %r15,__LC_PANIC_STACK | |
721 | 0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
722 | j mcck_skip | |
1da177e4 | 723 | |
7dd6b334 MH |
724 | # |
725 | # PSW restart interrupt handler | |
726 | # | |
8b646bd7 | 727 | ENTRY(restart_int_handler) |
c5328901 | 728 | stg %r15,__LC_SAVE_AREA_RESTART |
8b646bd7 | 729 | lg %r15,__LC_RESTART_STACK |
c5328901 | 730 | aghi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 731 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
732 | stmg %r0,%r14,__PT_R0(%r15) |
733 | mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART | |
734 | mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
735 | aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
736 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
737 | lg %r1,__LC_RESTART_FN # load fn, parm & source cpu |
738 | lg %r2,__LC_RESTART_DATA | |
739 | lg %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
740 | ltgr %r3,%r3 # test source cpu address |
741 | jm 1f # negative -> skip source stop | |
eb546195 | 742 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
743 | brc 10,0b # wait for status stored |
744 | 1: basr %r14,%r1 # call function | |
745 | stap __SF_EMPTY(%r15) # store cpu address | |
746 | llgh %r3,__SF_EMPTY(%r15) | |
eb546195 | 747 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
748 | brc 2,2b |
749 | 3: j 3b | |
7dd6b334 | 750 | |
860dba45 MS |
751 | .section .kprobes.text, "ax" |
752 | ||
1da177e4 LT |
753 | #ifdef CONFIG_CHECK_STACK |
754 | /* | |
755 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
756 | * No need to properly save the registers, we are going to panic anyway. | |
757 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
758 | */ | |
759 | stack_overflow: | |
dc7ee00d MS |
760 | lg %r15,__LC_PANIC_STACK # change to panic stack |
761 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
c5328901 MS |
762 | stmg %r0,%r7,__PT_R0(%r11) |
763 | stmg %r8,%r9,__PT_PSW(%r11) | |
764 | mvc __PT_R8(64,%r11),0(%r14) | |
765 | stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 | |
c5328901 MS |
766 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
767 | lgr %r2,%r11 # pass pointer to pt_regs | |
1da177e4 LT |
768 | jg kernel_stack_overflow |
769 | #endif | |
770 | ||
c5328901 MS |
771 | .align 8 |
772 | cleanup_table: | |
773 | .quad system_call | |
774 | .quad sysc_do_svc | |
775 | .quad sysc_tif | |
776 | .quad sysc_restore | |
777 | .quad sysc_done | |
778 | .quad io_tif | |
779 | .quad io_restore | |
780 | .quad io_done | |
4c1051e3 MS |
781 | .quad psw_idle |
782 | .quad psw_idle_end | |
1da177e4 LT |
783 | |
784 | cleanup_critical: | |
c5328901 | 785 | clg %r9,BASED(cleanup_table) # system_call |
1da177e4 | 786 | jl 0f |
c5328901 | 787 | clg %r9,BASED(cleanup_table+8) # sysc_do_svc |
1da177e4 | 788 | jl cleanup_system_call |
c5328901 | 789 | clg %r9,BASED(cleanup_table+16) # sysc_tif |
1da177e4 | 790 | jl 0f |
c5328901 | 791 | clg %r9,BASED(cleanup_table+24) # sysc_restore |
6a2df3a8 | 792 | jl cleanup_sysc_tif |
c5328901 | 793 | clg %r9,BASED(cleanup_table+32) # sysc_done |
6a2df3a8 | 794 | jl cleanup_sysc_restore |
c5328901 | 795 | clg %r9,BASED(cleanup_table+40) # io_tif |
63b12246 | 796 | jl 0f |
c5328901 | 797 | clg %r9,BASED(cleanup_table+48) # io_restore |
6a2df3a8 | 798 | jl cleanup_io_tif |
c5328901 | 799 | clg %r9,BASED(cleanup_table+56) # io_done |
6a2df3a8 | 800 | jl cleanup_io_restore |
4c1051e3 MS |
801 | clg %r9,BASED(cleanup_table+64) # psw_idle |
802 | jl 0f | |
803 | clg %r9,BASED(cleanup_table+72) # psw_idle_end | |
804 | jl cleanup_idle | |
c5328901 MS |
805 | 0: br %r14 |
806 | ||
1da177e4 LT |
807 | |
808 | cleanup_system_call: | |
c5328901 MS |
809 | # check if stpt has been executed |
810 | clg %r9,BASED(cleanup_system_call_insn) | |
1da177e4 LT |
811 | jh 0f |
812 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
c5328901 | 813 | cghi %r11,__LC_SAVE_AREA_ASYNC |
6377981f | 814 | je 0f |
c5328901 MS |
815 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
816 | 0: # check if stmg has been executed | |
817 | clg %r9,BASED(cleanup_system_call_insn+8) | |
1da177e4 | 818 | jh 0f |
c5328901 MS |
819 | mvc __LC_SAVE_AREA_SYNC(64),0(%r11) |
820 | 0: # check if base register setup + TIF bit load has been done | |
821 | clg %r9,BASED(cleanup_system_call_insn+16) | |
822 | jhe 0f | |
823 | # set up saved registers r10 and r12 | |
824 | stg %r10,16(%r11) # r10 last break | |
825 | stg %r12,32(%r11) # r12 thread-info pointer | |
826 | 0: # check if the user time update has been done | |
827 | clg %r9,BASED(cleanup_system_call_insn+24) | |
828 | jh 0f | |
829 | lg %r15,__LC_EXIT_TIMER | |
830 | slg %r15,__LC_SYNC_ENTER_TIMER | |
831 | alg %r15,__LC_USER_TIMER | |
832 | stg %r15,__LC_USER_TIMER | |
833 | 0: # check if the system time update has been done | |
834 | clg %r9,BASED(cleanup_system_call_insn+32) | |
835 | jh 0f | |
836 | lg %r15,__LC_LAST_UPDATE_TIMER | |
837 | slg %r15,__LC_EXIT_TIMER | |
838 | alg %r15,__LC_SYSTEM_TIMER | |
839 | stg %r15,__LC_SYSTEM_TIMER | |
840 | 0: # update accounting time stamp | |
1da177e4 | 841 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
c5328901 MS |
842 | # do LAST_BREAK |
843 | lg %r9,16(%r11) | |
844 | srag %r9,%r9,23 | |
86f2552b | 845 | jz 0f |
c5328901 MS |
846 | mvc __TI_last_break(8,%r12),16(%r11) |
847 | 0: # set up saved register r11 | |
848 | lg %r15,__LC_KERNEL_STACK | |
dc7ee00d MS |
849 | la %r9,STACK_FRAME_OVERHEAD(%r15) |
850 | stg %r9,24(%r11) # r11 pt_regs pointer | |
c5328901 | 851 | # fill pt_regs |
dc7ee00d MS |
852 | mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC |
853 | stmg %r0,%r7,__PT_R0(%r9) | |
854 | mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW | |
855 | mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC | |
c5328901 | 856 | # setup saved register r15 |
c5328901 MS |
857 | stg %r15,56(%r11) # r15 stack pointer |
858 | # set new psw address and exit | |
859 | larl %r9,sysc_do_svc | |
1da177e4 LT |
860 | br %r14 |
861 | cleanup_system_call_insn: | |
25d83cbf | 862 | .quad system_call |
c5328901 MS |
863 | .quad sysc_stmg |
864 | .quad sysc_per | |
865 | .quad sysc_vtime+18 | |
866 | .quad sysc_vtime+42 | |
1da177e4 | 867 | |
6a2df3a8 | 868 | cleanup_sysc_tif: |
c5328901 | 869 | larl %r9,sysc_tif |
1da177e4 LT |
870 | br %r14 |
871 | ||
6a2df3a8 | 872 | cleanup_sysc_restore: |
c5328901 | 873 | clg %r9,BASED(cleanup_sysc_restore_insn) |
6377981f | 874 | je 0f |
c5328901 MS |
875 | lg %r9,24(%r11) # get saved pointer to pt_regs |
876 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
877 | mvc 0(64,%r11),__PT_R8(%r9) | |
878 | lmg %r0,%r7,__PT_R0(%r9) | |
879 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
1da177e4 | 880 | br %r14 |
6a2df3a8 | 881 | cleanup_sysc_restore_insn: |
411788ea | 882 | .quad sysc_done - 4 |
1da177e4 | 883 | |
6a2df3a8 | 884 | cleanup_io_tif: |
c5328901 | 885 | larl %r9,io_tif |
176b1803 MS |
886 | br %r14 |
887 | ||
6a2df3a8 | 888 | cleanup_io_restore: |
c5328901 MS |
889 | clg %r9,BASED(cleanup_io_restore_insn) |
890 | je 0f | |
891 | lg %r9,24(%r11) # get saved r11 pointer to pt_regs | |
892 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
c5328901 MS |
893 | mvc 0(64,%r11),__PT_R8(%r9) |
894 | lmg %r0,%r7,__PT_R0(%r9) | |
895 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
ae6aa2ea | 896 | br %r14 |
6a2df3a8 | 897 | cleanup_io_restore_insn: |
411788ea | 898 | .quad io_done - 4 |
ae6aa2ea | 899 | |
4c1051e3 MS |
900 | cleanup_idle: |
901 | # copy interrupt clock & cpu timer | |
27f6b416 MS |
902 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK |
903 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER | |
4c1051e3 MS |
904 | cghi %r11,__LC_SAVE_AREA_ASYNC |
905 | je 0f | |
27f6b416 MS |
906 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK |
907 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER | |
4c1051e3 MS |
908 | 0: # check if stck & stpt have been executed |
909 | clg %r9,BASED(cleanup_idle_insn) | |
910 | jhe 1f | |
27f6b416 MS |
911 | mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) |
912 | mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) | |
913 | 1: # account system time going idle | |
4c1051e3 | 914 | lg %r9,__LC_STEAL_TIMER |
27f6b416 | 915 | alg %r9,__CLOCK_IDLE_ENTER(%r2) |
4c1051e3 MS |
916 | slg %r9,__LC_LAST_UPDATE_CLOCK |
917 | stg %r9,__LC_STEAL_TIMER | |
27f6b416 | 918 | mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) |
4c1051e3 MS |
919 | lg %r9,__LC_SYSTEM_TIMER |
920 | alg %r9,__LC_LAST_UPDATE_TIMER | |
27f6b416 | 921 | slg %r9,__TIMER_IDLE_ENTER(%r2) |
4c1051e3 | 922 | stg %r9,__LC_SYSTEM_TIMER |
27f6b416 | 923 | mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) |
4c1051e3 MS |
924 | # prepare return psw |
925 | nihh %r8,0xfffd # clear wait state bit | |
926 | lg %r9,48(%r11) # return from psw_idle | |
927 | br %r14 | |
928 | cleanup_idle_insn: | |
929 | .quad psw_idle_lpsw | |
930 | ||
1da177e4 LT |
931 | /* |
932 | * Integer constants | |
933 | */ | |
c5328901 | 934 | .align 8 |
1da177e4 | 935 | .Lcritical_start: |
c5328901 MS |
936 | .quad __critical_start |
937 | .Lcritical_length: | |
938 | .quad __critical_end - __critical_start | |
939 | ||
1da177e4 | 940 | |
603d1a50 MS |
941 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
942 | /* | |
943 | * sie64a calling convention: | |
944 | * %r2 pointer to sie control block | |
945 | * %r3 guest register save area | |
946 | */ | |
144d634a | 947 | ENTRY(sie64a) |
603d1a50 MS |
948 | stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers |
949 | stg %r2,__SF_EMPTY(%r15) # save control block pointer | |
950 | stg %r3,__SF_EMPTY+8(%r15) # save guest register save area | |
7c470539 | 951 | xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason |
603d1a50 | 952 | lmg %r0,%r13,0(%r3) # load guest gprs 0-13 |
480e5926 CB |
953 | lg %r14,__LC_GMAP # get gmap pointer |
954 | ltgr %r14,%r14 | |
955 | jz sie_gmap | |
956 | lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce | |
957 | sie_gmap: | |
603d1a50 | 958 | lg %r14,__SF_EMPTY(%r15) # get control block pointer |
49b99e1e CB |
959 | oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now |
960 | tm __SIE_PROG20+3(%r14),1 # last exit... | |
961 | jnz sie_done | |
23d18e8d | 962 | LPP __SF_EMPTY(%r15) # set guest id |
603d1a50 MS |
963 | sie 0(%r14) |
964 | sie_done: | |
23d18e8d | 965 | LPP __SF_EMPTY+16(%r15) # set host id |
95d38fd0 | 966 | ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE |
480e5926 | 967 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
7c470539 MS |
968 | # some program checks are suppressing. C code (e.g. do_protection_exception) |
969 | # will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other | |
970 | # instructions beween sie64a and sie_done should not cause program | |
971 | # interrupts. So lets use a nop (47 00 00 00) as a landing pad. | |
972 | # See also HANDLE_SIE_INTERCEPT | |
973 | rewind_pad: | |
974 | nop 0 | |
b764bb1c | 975 | .globl sie_exit |
7c470539 | 976 | sie_exit: |
603d1a50 MS |
977 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
978 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
979 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
7c470539 | 980 | lg %r2,__SF_EMPTY+24(%r15) # return exit reason code |
603d1a50 MS |
981 | br %r14 |
982 | sie_fault: | |
7c470539 MS |
983 | lghi %r14,-EFAULT |
984 | stg %r14,__SF_EMPTY+24(%r15) # set exit reason code | |
985 | j sie_exit | |
603d1a50 MS |
986 | |
987 | .align 8 | |
7c470539 MS |
988 | .Lsie_critical: |
989 | .quad sie_gmap | |
990 | .Lsie_critical_length: | |
991 | .quad sie_done - sie_gmap | |
603d1a50 | 992 | |
ce6a04ac | 993 | EX_TABLE(rewind_pad,sie_fault) |
7c470539 | 994 | EX_TABLE(sie_exit,sie_fault) |
603d1a50 MS |
995 | #endif |
996 | ||
25d83cbf | 997 | .section .rodata, "a" |
1da177e4 | 998 | #define SYSCALL(esa,esame,emu) .long esame |
9bf1226b | 999 | .globl sys_call_table |
1da177e4 LT |
1000 | sys_call_table: |
1001 | #include "syscalls.S" | |
1002 | #undef SYSCALL | |
1003 | ||
347a8dc3 | 1004 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
1005 | |
1006 | #define SYSCALL(esa,esame,emu) .long emu | |
61649881 | 1007 | .globl sys_call_table_emu |
1da177e4 LT |
1008 | sys_call_table_emu: |
1009 | #include "syscalls.S" | |
1010 | #undef SYSCALL | |
1011 | #endif |