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> |
1da177e4 | 13 | #include <asm/cache.h> |
1da177e4 LT |
14 | #include <asm/errno.h> |
15 | #include <asm/ptrace.h> | |
16 | #include <asm/thread_info.h> | |
0013a854 | 17 | #include <asm/asm-offsets.h> |
1da177e4 LT |
18 | #include <asm/unistd.h> |
19 | #include <asm/page.h> | |
eb546195 | 20 | #include <asm/sigp.h> |
1da177e4 | 21 | |
c5328901 MS |
22 | __PT_R0 = __PT_GPRS |
23 | __PT_R1 = __PT_GPRS + 8 | |
24 | __PT_R2 = __PT_GPRS + 16 | |
25 | __PT_R3 = __PT_GPRS + 24 | |
26 | __PT_R4 = __PT_GPRS + 32 | |
27 | __PT_R5 = __PT_GPRS + 40 | |
28 | __PT_R6 = __PT_GPRS + 48 | |
29 | __PT_R7 = __PT_GPRS + 56 | |
30 | __PT_R8 = __PT_GPRS + 64 | |
31 | __PT_R9 = __PT_GPRS + 72 | |
32 | __PT_R10 = __PT_GPRS + 80 | |
33 | __PT_R11 = __PT_GPRS + 88 | |
34 | __PT_R12 = __PT_GPRS + 96 | |
35 | __PT_R13 = __PT_GPRS + 104 | |
36 | __PT_R14 = __PT_GPRS + 112 | |
37 | __PT_R15 = __PT_GPRS + 120 | |
1da177e4 LT |
38 | |
39 | STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER | |
40 | STACK_SIZE = 1 << STACK_SHIFT | |
41 | ||
753c4dd6 | 42 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
b6ef5bb3 | 43 | _TIF_MCCK_PENDING | _TIF_PER_TRAP ) |
753c4dd6 | 44 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 45 | _TIF_MCCK_PENDING) |
b6ef5bb3 MS |
46 | _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
47 | _TIF_SYSCALL_TRACEPOINT) | |
603d1a50 | 48 | _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) |
1da177e4 LT |
49 | |
50 | #define BASED(name) name-system_call(%r13) | |
51 | ||
1f194a4c | 52 | .macro TRACE_IRQS_ON |
c5328901 | 53 | #ifdef CONFIG_TRACE_IRQFLAGS |
6a2df3a8 MS |
54 | basr %r2,%r0 |
55 | brasl %r14,trace_hardirqs_on_caller | |
c5328901 | 56 | #endif |
1f194a4c HC |
57 | .endm |
58 | ||
59 | .macro TRACE_IRQS_OFF | |
c5328901 | 60 | #ifdef CONFIG_TRACE_IRQFLAGS |
6a2df3a8 MS |
61 | basr %r2,%r0 |
62 | brasl %r14,trace_hardirqs_off_caller | |
411788ea | 63 | #endif |
c5328901 | 64 | .endm |
411788ea | 65 | |
411788ea | 66 | .macro LOCKDEP_SYS_EXIT |
c5328901 MS |
67 | #ifdef CONFIG_LOCKDEP |
68 | tm __PT_PSW+1(%r11),0x01 # returning to user ? | |
69 | jz .+10 | |
411788ea | 70 | brasl %r14,lockdep_sys_exit |
1f194a4c | 71 | #endif |
1da177e4 | 72 | .endm |
1da177e4 | 73 | |
c5328901 MS |
74 | .macro SPP newpp |
75 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) | |
76 | tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP | |
77 | jz .+8 | |
78 | .insn s,0xb2800000,\newpp | |
79 | #endif | |
80 | .endm | |
1da177e4 | 81 | |
c5328901 MS |
82 | .macro HANDLE_SIE_INTERCEPT scratch |
83 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) | |
6022afc0 MS |
84 | tmhh %r8,0x0001 # interrupting from user ? |
85 | jnz .+42 | |
c5328901 MS |
86 | lgr \scratch,%r9 |
87 | slg \scratch,BASED(.Lsie_loop) | |
88 | clg \scratch,BASED(.Lsie_length) | |
6022afc0 | 89 | jhe .+22 |
c5328901 | 90 | lg %r9,BASED(.Lsie_loop) |
9ee39e4b | 91 | SPP BASED(.Lhost_id) # set host id |
c5328901 | 92 | #endif |
987ad70a MS |
93 | .endm |
94 | ||
c5328901 | 95 | .macro CHECK_STACK stacksize,savearea |
63b12246 | 96 | #ifdef CONFIG_CHECK_STACK |
c5328901 MS |
97 | tml %r15,\stacksize - CONFIG_STACK_GUARD |
98 | lghi %r14,\savearea | |
99 | jz stack_overflow | |
63b12246 | 100 | #endif |
63b12246 MS |
101 | .endm |
102 | ||
c5328901 MS |
103 | .macro SWITCH_ASYNC savearea,stack,shift |
104 | tmhh %r8,0x0001 # interrupting from user ? | |
105 | jnz 1f | |
106 | lgr %r14,%r9 | |
107 | slg %r14,BASED(.Lcritical_start) | |
108 | clg %r14,BASED(.Lcritical_length) | |
1da177e4 | 109 | jhe 0f |
c5328901 | 110 | lghi %r11,\savearea # inside critical section, do cleanup |
1da177e4 | 111 | brasl %r14,cleanup_critical |
c5328901 | 112 | tmhh %r8,0x0001 # retest problem state after cleanup |
1da177e4 | 113 | jnz 1f |
c5328901 | 114 | 0: lg %r14,\stack # are we already on the target stack? |
1da177e4 | 115 | slgr %r14,%r15 |
c5328901 | 116 | srag %r14,%r14,\shift |
86f2552b | 117 | jnz 1f |
c5328901 MS |
118 | CHECK_STACK 1<<\shift,\savearea |
119 | j 2f | |
120 | 1: lg %r15,\stack # load target stack | |
121 | 2: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
122 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
25d83cbf | 123 | .endm |
1da177e4 | 124 | |
c5328901 MS |
125 | .macro UPDATE_VTIME scratch,enter_timer |
126 | lg \scratch,__LC_EXIT_TIMER | |
127 | slg \scratch,\enter_timer | |
128 | alg \scratch,__LC_USER_TIMER | |
129 | stg \scratch,__LC_USER_TIMER | |
130 | lg \scratch,__LC_LAST_UPDATE_TIMER | |
131 | slg \scratch,__LC_EXIT_TIMER | |
132 | alg \scratch,__LC_SYSTEM_TIMER | |
133 | stg \scratch,__LC_SYSTEM_TIMER | |
134 | mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer | |
1da177e4 LT |
135 | .endm |
136 | ||
c5328901 MS |
137 | .macro LAST_BREAK scratch |
138 | srag \scratch,%r10,23 | |
139 | jz .+10 | |
140 | stg %r10,__TI_last_break(%r12) | |
86f2552b MS |
141 | .endm |
142 | ||
1e54622e | 143 | .macro REENABLE_IRQS |
c5328901 MS |
144 | stg %r8,__LC_RETURN_PSW |
145 | ni __LC_RETURN_PSW,0xbf | |
146 | ssm __LC_RETURN_PSW | |
1e54622e MS |
147 | .endm |
148 | ||
473e66ba | 149 | .macro STCK savearea |
d652d596 | 150 | #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES |
473e66ba HC |
151 | .insn s,0xb27c0000,\savearea # store clock fast |
152 | #else | |
153 | .insn s,0xb2050000,\savearea # store clock | |
154 | #endif | |
155 | .endm | |
156 | ||
860dba45 MS |
157 | .section .kprobes.text, "ax" |
158 | ||
1da177e4 LT |
159 | /* |
160 | * Scheduler resume function, called by switch_to | |
161 | * gpr2 = (task_struct *) prev | |
162 | * gpr3 = (task_struct *) next | |
163 | * Returns: | |
164 | * gpr2 = prev | |
165 | */ | |
144d634a | 166 | ENTRY(__switch_to) |
eda0c6d6 MS |
167 | stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
168 | stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev | |
5e9a2692 MS |
169 | lg %r4,__THREAD_info(%r2) # get thread_info of prev |
170 | lg %r5,__THREAD_info(%r3) # get thread_info of next | |
eda0c6d6 MS |
171 | lgr %r15,%r5 |
172 | aghi %r15,STACK_SIZE # end of kernel stack of next | |
173 | stg %r3,__LC_CURRENT # store task struct of next | |
174 | stg %r5,__LC_THREAD_INFO # store thread info of next | |
175 | stg %r15,__LC_KERNEL_STACK # store end of kernel stack | |
176 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
177 | mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next | |
178 | lg %r15,__THREAD_ksp(%r3) # load kernel stack of next | |
77fa2245 | 179 | tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending? |
5e9a2692 MS |
180 | jz 0f |
181 | ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
182 | oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next | |
eda0c6d6 | 183 | 0: lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
1da177e4 LT |
184 | br %r14 |
185 | ||
186 | __critical_start: | |
187 | /* | |
188 | * SVC interrupt handler routine. System calls are synchronous events and | |
189 | * are executed with interrupts enabled. | |
190 | */ | |
191 | ||
144d634a | 192 | ENTRY(system_call) |
c185b783 | 193 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
194 | sysc_stmg: |
195 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC | |
196 | lg %r10,__LC_LAST_BREAK | |
197 | lg %r12,__LC_THREAD_INFO | |
198 | larl %r13,system_call | |
199 | sysc_per: | |
200 | lg %r15,__LC_KERNEL_STACK | |
201 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
202 | la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs | |
1da177e4 | 203 | sysc_vtime: |
c5328901 MS |
204 | UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER |
205 | LAST_BREAK %r13 | |
206 | stmg %r0,%r7,__PT_R0(%r11) | |
207 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
208 | mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW | |
aa33c8cb | 209 | mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
1da177e4 | 210 | sysc_do_svc: |
c5328901 | 211 | oi __TI_flags+7(%r12),_TIF_SYSCALL |
aa33c8cb | 212 | llgh %r8,__PT_INT_CODE+2(%r11) |
c5328901 | 213 | slag %r8,%r8,2 # shift and test for svc 0 |
1da177e4 LT |
214 | jnz sysc_nr_ok |
215 | # svc 0: system call number in %r1 | |
c5328901 | 216 | llgfr %r1,%r1 # clear high word in r1 |
86f2552b | 217 | cghi %r1,NR_syscalls |
1da177e4 | 218 | jnl sysc_nr_ok |
aa33c8cb | 219 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 | 220 | slag %r8,%r1,2 |
1da177e4 | 221 | sysc_nr_ok: |
c5328901 | 222 | larl %r10,sys_call_table # 64 bit system call table |
347a8dc3 | 223 | #ifdef CONFIG_COMPAT |
c5328901 | 224 | tm __TI_flags+5(%r12),(_TIF_31BIT>>16) |
c563077e | 225 | jno sysc_noemu |
c5328901 | 226 | larl %r10,sys_call_table_emu # 31 bit system call table |
1da177e4 LT |
227 | sysc_noemu: |
228 | #endif | |
c5328901 MS |
229 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
230 | stg %r2,__PT_ORIG_GPR2(%r11) | |
231 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
232 | lgf %r9,0(%r8,%r10) # get system call add. | |
b6ef5bb3 | 233 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 234 | jnz sysc_tracesys |
c5328901 MS |
235 | basr %r14,%r9 # call sys_xxxx |
236 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 LT |
237 | |
238 | sysc_return: | |
6a2df3a8 MS |
239 | LOCKDEP_SYS_EXIT |
240 | sysc_tif: | |
c5328901 | 241 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
b6ef5bb3 | 242 | jno sysc_restore |
86f2552b | 243 | tm __TI_flags+7(%r12),_TIF_WORK_SVC |
c5328901 | 244 | jnz sysc_work # check for work |
b6ef5bb3 | 245 | ni __TI_flags+7(%r12),255-_TIF_SYSCALL |
411788ea | 246 | sysc_restore: |
c5328901 MS |
247 | lg %r14,__LC_VDSO_PER_CPU |
248 | lmg %r0,%r10,__PT_R0(%r11) | |
249 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
250 | stpt __LC_EXIT_TIMER | |
251 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
252 | lmg %r11,%r15,__PT_R11(%r11) | |
253 | lpswe __LC_RETURN_PSW | |
411788ea HC |
254 | sysc_done: |
255 | ||
43d399d2 MS |
256 | # |
257 | # One of the work bits is on. Find out which one. | |
258 | # | |
b6ef5bb3 | 259 | sysc_work: |
86f2552b | 260 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 261 | jo sysc_mcck_pending |
86f2552b | 262 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 263 | jo sysc_reschedule |
86f2552b | 264 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 265 | jo sysc_sigpending |
86f2552b | 266 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 | 267 | jo sysc_notify_resume |
5e9a2692 | 268 | tm __TI_flags+7(%r12),_TIF_PER_TRAP |
1da177e4 | 269 | jo sysc_singlestep |
43d399d2 | 270 | j sysc_return # beware of critical section cleanup |
1da177e4 LT |
271 | |
272 | # | |
273 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
274 | # |
275 | sysc_reschedule: | |
6a2df3a8 | 276 | larl %r14,sysc_return |
c5328901 | 277 | jg schedule |
1da177e4 | 278 | |
77fa2245 HC |
279 | # |
280 | # _TIF_MCCK_PENDING is set, call handler | |
281 | # | |
282 | sysc_mcck_pending: | |
6a2df3a8 | 283 | larl %r14,sysc_return |
25d83cbf | 284 | jg s390_handle_mcck # TIF bit will be cleared by handler |
77fa2245 | 285 | |
1da177e4 | 286 | # |
02a029b3 | 287 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 288 | # |
25d83cbf | 289 | sysc_sigpending: |
5e9a2692 | 290 | ni __TI_flags+7(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP |
c5328901 MS |
291 | lgr %r2,%r11 # pass pointer to pt_regs |
292 | brasl %r14,do_signal | |
b6ef5bb3 MS |
293 | tm __TI_flags+7(%r12),_TIF_SYSCALL |
294 | jno sysc_return | |
c5328901 MS |
295 | lmg %r2,%r7,__PT_R2(%r11) # load svc arguments |
296 | lghi %r8,0 # svc 0 returns -ENOSYS | |
aa33c8cb | 297 | lh %r1,__PT_INT_CODE+2(%r11) # load new svc number |
b6ef5bb3 MS |
298 | cghi %r1,NR_syscalls |
299 | jnl sysc_nr_ok # invalid svc number -> do svc 0 | |
c5328901 | 300 | slag %r8,%r1,2 |
b6ef5bb3 | 301 | j sysc_nr_ok # restart svc |
1da177e4 | 302 | |
753c4dd6 MS |
303 | # |
304 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
305 | # | |
306 | sysc_notify_resume: | |
c5328901 | 307 | lgr %r2,%r11 # pass pointer to pt_regs |
6a2df3a8 | 308 | larl %r14,sysc_return |
c5328901 | 309 | jg do_notify_resume |
753c4dd6 | 310 | |
1da177e4 | 311 | # |
5e9a2692 | 312 | # _TIF_PER_TRAP is set, call do_per_trap |
1da177e4 LT |
313 | # |
314 | sysc_singlestep: | |
b6ef5bb3 | 315 | ni __TI_flags+7(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP) |
c5328901 MS |
316 | lgr %r2,%r11 # pass pointer to pt_regs |
317 | larl %r14,sysc_return | |
5e9a2692 | 318 | jg do_per_trap |
1da177e4 | 319 | |
1da177e4 | 320 | # |
753c4dd6 MS |
321 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
322 | # and after the system call | |
1da177e4 LT |
323 | # |
324 | sysc_tracesys: | |
c5328901 | 325 | lgr %r2,%r11 # pass pointer to pt_regs |
1da177e4 | 326 | la %r3,0 |
aa33c8cb | 327 | llgh %r0,__PT_INT_CODE+2(%r11) |
c5328901 | 328 | stg %r0,__PT_R2(%r11) |
753c4dd6 | 329 | brasl %r14,do_syscall_trace_enter |
1da177e4 | 330 | lghi %r0,NR_syscalls |
753c4dd6 | 331 | clgr %r0,%r2 |
1da177e4 | 332 | jnh sysc_tracenogo |
c5328901 MS |
333 | sllg %r8,%r2,2 |
334 | lgf %r9,0(%r8,%r10) | |
1da177e4 | 335 | sysc_tracego: |
c5328901 MS |
336 | lmg %r3,%r7,__PT_R3(%r11) |
337 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
338 | lg %r2,__PT_ORIG_GPR2(%r11) | |
339 | basr %r14,%r9 # call sys_xxx | |
340 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 | 341 | sysc_tracenogo: |
b6ef5bb3 | 342 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 343 | jz sysc_return |
c5328901 MS |
344 | lgr %r2,%r11 # pass pointer to pt_regs |
345 | larl %r14,sysc_return | |
753c4dd6 | 346 | jg do_syscall_trace_exit |
1da177e4 LT |
347 | |
348 | # | |
349 | # a new process exits the kernel with ret_from_fork | |
350 | # | |
144d634a | 351 | ENTRY(ret_from_fork) |
c5328901 MS |
352 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
353 | lg %r12,__LC_THREAD_INFO | |
354 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? | |
1da177e4 | 355 | jo 0f |
c5328901 | 356 | stg %r15,__PT_R15(%r11) # store stack pointer for new kthread |
25d83cbf | 357 | 0: brasl %r14,schedule_tail |
1f194a4c | 358 | TRACE_IRQS_ON |
c5328901 | 359 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
8f2961c3 | 360 | j sysc_tracenogo |
1da177e4 LT |
361 | |
362 | # | |
03ff9a23 MS |
363 | # kernel_execve function needs to deal with pt_regs that is not |
364 | # at the usual place | |
1da177e4 | 365 | # |
144d634a | 366 | ENTRY(kernel_execve) |
03ff9a23 MS |
367 | stmg %r12,%r15,96(%r15) |
368 | lgr %r14,%r15 | |
c5328901 | 369 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
03ff9a23 | 370 | stg %r14,__SF_BACKCHAIN(%r15) |
c5328901 | 371 | la %r12,STACK_FRAME_OVERHEAD(%r15) |
03ff9a23 MS |
372 | xc 0(__PT_SIZE,%r12),0(%r12) |
373 | lgr %r5,%r12 | |
374 | brasl %r14,do_execve | |
375 | ltgfr %r2,%r2 | |
376 | je 0f | |
c5328901 | 377 | aghi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE) |
03ff9a23 MS |
378 | lmg %r12,%r15,96(%r15) |
379 | br %r14 | |
380 | # execve succeeded. | |
c5328901 | 381 | 0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
03ff9a23 | 382 | lg %r15,__LC_KERNEL_STACK # load ksp |
c5328901 MS |
383 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
384 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
385 | mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs | |
86f2552b | 386 | lg %r12,__LC_THREAD_INFO |
03ff9a23 | 387 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
c5328901 | 388 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
03ff9a23 MS |
389 | brasl %r14,execve_tail |
390 | j sysc_return | |
1da177e4 LT |
391 | |
392 | /* | |
393 | * Program check handler routine | |
394 | */ | |
395 | ||
144d634a | 396 | ENTRY(pgm_check_handler) |
c185b783 | 397 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
398 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
399 | lg %r10,__LC_LAST_BREAK | |
400 | lg %r12,__LC_THREAD_INFO | |
401 | larl %r13,system_call | |
402 | lmg %r8,%r9,__LC_PGM_OLD_PSW | |
403 | HANDLE_SIE_INTERCEPT %r14 | |
404 | tmhh %r8,0x0001 # test problem state bit | |
405 | jnz 1f # -> fault in user space | |
406 | tmhh %r8,0x4000 # PER bit set in old PSW ? | |
407 | jnz 0f # -> enabled, can't be a double fault | |
408 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
409 | jnz pgm_svcper # -> single stepped svc | |
410 | 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC | |
411 | j 2f | |
412 | 1: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER | |
413 | LAST_BREAK %r14 | |
414 | lg %r15,__LC_KERNEL_STACK | |
415 | 2: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
416 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
417 | stmg %r0,%r7,__PT_R0(%r11) | |
418 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
419 | stmg %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
420 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
421 | mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE | |
c5328901 MS |
422 | stg %r10,__PT_ARGS(%r11) |
423 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
424 | jz 0f | |
86f2552b | 425 | lg %r1,__TI_task(%r12) |
c5328901 MS |
426 | tmhh %r8,0x0001 # kernel per event ? |
427 | jz pgm_kprobe | |
428 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
5e9a2692 | 429 | mvc __THREAD_per_address(8,%r1),__LC_PER_ADDRESS |
c5328901 | 430 | mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE |
5e9a2692 | 431 | mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID |
aa33c8cb | 432 | 0: REENABLE_IRQS |
c5328901 | 433 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f5cdac27 | 434 | larl %r1,pgm_check_table |
aa33c8cb MS |
435 | llgh %r10,__PT_INT_CODE+2(%r11) |
436 | nill %r10,0x007f | |
437 | sll %r10,3 | |
438 | je sysc_return | |
c5328901 MS |
439 | lg %r1,0(%r10,%r1) # load address of handler routine |
440 | lgr %r2,%r11 # pass pointer to pt_regs | |
f5cdac27 | 441 | basr %r14,%r1 # branch to interrupt-handler |
f5cdac27 | 442 | j sysc_return |
1da177e4 LT |
443 | |
444 | # | |
c5328901 | 445 | # PER event in supervisor state, must be kprobes |
1da177e4 | 446 | # |
c5328901 MS |
447 | pgm_kprobe: |
448 | REENABLE_IRQS | |
449 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
450 | lgr %r2,%r11 # pass pointer to pt_regs | |
451 | brasl %r14,do_per_trap | |
452 | j sysc_return | |
1da177e4 | 453 | |
4ba069b8 | 454 | # |
c5328901 | 455 | # single stepped system call |
4ba069b8 | 456 | # |
c5328901 MS |
457 | pgm_svcper: |
458 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
459 | mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW | |
460 | larl %r14,sysc_per | |
461 | stg %r14,__LC_RETURN_PSW+8 | |
462 | lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs | |
4ba069b8 | 463 | |
1da177e4 LT |
464 | /* |
465 | * IO interrupt handler routine | |
466 | */ | |
144d634a | 467 | ENTRY(io_int_handler) |
473e66ba | 468 | STCK __LC_INT_CLOCK |
9cfb9b3c | 469 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
470 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
471 | lg %r10,__LC_LAST_BREAK | |
472 | lg %r12,__LC_THREAD_INFO | |
473 | larl %r13,system_call | |
474 | lmg %r8,%r9,__LC_IO_OLD_PSW | |
475 | HANDLE_SIE_INTERCEPT %r14 | |
476 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
477 | tmhh %r8,0x0001 # interrupting from user? | |
478 | jz io_skip | |
479 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
480 | LAST_BREAK %r14 | |
481 | io_skip: | |
482 | stmg %r0,%r7,__PT_R0(%r11) | |
483 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
484 | stmg %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 485 | TRACE_IRQS_OFF |
c5328901 MS |
486 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
487 | lgr %r2,%r11 # pass pointer to pt_regs | |
488 | brasl %r14,do_IRQ | |
1da177e4 | 489 | io_return: |
6a2df3a8 MS |
490 | LOCKDEP_SYS_EXIT |
491 | TRACE_IRQS_ON | |
492 | io_tif: | |
86f2552b | 493 | tm __TI_flags+7(%r12),_TIF_WORK_INT |
25d83cbf | 494 | jnz io_work # there is work to do (signals etc.) |
411788ea | 495 | io_restore: |
c5328901 MS |
496 | lg %r14,__LC_VDSO_PER_CPU |
497 | lmg %r0,%r10,__PT_R0(%r11) | |
498 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
c5328901 MS |
499 | stpt __LC_EXIT_TIMER |
500 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
501 | lmg %r11,%r15,__PT_R11(%r11) | |
502 | lpswe __LC_RETURN_PSW | |
ae6aa2ea | 503 | io_done: |
1da177e4 | 504 | |
2688905e | 505 | # |
43d399d2 MS |
506 | # There is work todo, find out in which context we have been interrupted: |
507 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
508 | # 2) if we return to kernel code and kvm is enabled check if we need to | |
509 | # modify the psw to leave SIE | |
510 | # 3) if we return to kernel code and preemptive scheduling is enabled check | |
511 | # the preemption counter and if it is zero call preempt_schedule_irq | |
512 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
513 | # |
514 | io_work: | |
c5328901 | 515 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
43d399d2 | 516 | jo io_work_user # yes -> do resched & signal |
43d399d2 | 517 | #ifdef CONFIG_PREEMPT |
2688905e | 518 | # check for preemptive scheduling |
86f2552b | 519 | icm %r0,15,__TI_precount(%r12) |
2688905e | 520 | jnz io_restore # preemption is disabled |
6a2df3a8 MS |
521 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
522 | jno io_restore | |
1da177e4 | 523 | # switch to kernel stack |
c5328901 MS |
524 | lg %r1,__PT_R15(%r11) |
525 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
526 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
527 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
528 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 529 | lgr %r15,%r1 |
6a2df3a8 MS |
530 | # TRACE_IRQS_ON already done at io_return, call |
531 | # TRACE_IRQS_OFF to keep things symmetrical | |
532 | TRACE_IRQS_OFF | |
533 | brasl %r14,preempt_schedule_irq | |
534 | j io_return | |
535 | #else | |
43d399d2 | 536 | j io_restore |
6a2df3a8 | 537 | #endif |
1da177e4 | 538 | |
43d399d2 MS |
539 | # |
540 | # Need to do work before returning to userspace, switch to kernel stack | |
541 | # | |
2688905e | 542 | io_work_user: |
1da177e4 | 543 | lg %r1,__LC_KERNEL_STACK |
c5328901 MS |
544 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
545 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
546 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
547 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 548 | lgr %r15,%r1 |
43d399d2 | 549 | |
1da177e4 LT |
550 | # |
551 | # One of the work bits is on. Find out which one. | |
43d399d2 | 552 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
54dfe5dd | 553 | # and _TIF_MCCK_PENDING |
1da177e4 | 554 | # |
6a2df3a8 | 555 | io_work_tif: |
86f2552b | 556 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 557 | jo io_mcck_pending |
86f2552b | 558 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 559 | jo io_reschedule |
86f2552b | 560 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 561 | jo io_sigpending |
86f2552b | 562 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 MS |
563 | jo io_notify_resume |
564 | j io_return # beware of critical section cleanup | |
0eaeafa1 | 565 | |
77fa2245 HC |
566 | # |
567 | # _TIF_MCCK_PENDING is set, call handler | |
568 | # | |
569 | io_mcck_pending: | |
6a2df3a8 | 570 | # TRACE_IRQS_ON already done at io_return |
b771aeac | 571 | brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler |
6a2df3a8 MS |
572 | TRACE_IRQS_OFF |
573 | j io_return | |
77fa2245 | 574 | |
1da177e4 LT |
575 | # |
576 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
577 | # |
578 | io_reschedule: | |
6a2df3a8 | 579 | # TRACE_IRQS_ON already done at io_return |
c5328901 | 580 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 581 | brasl %r14,schedule # call scheduler |
c5328901 | 582 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 583 | TRACE_IRQS_OFF |
6a2df3a8 | 584 | j io_return |
1da177e4 LT |
585 | |
586 | # | |
02a029b3 | 587 | # _TIF_SIGPENDING or is set, call do_signal |
1da177e4 | 588 | # |
25d83cbf | 589 | io_sigpending: |
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_signal | |
594 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
411788ea | 595 | TRACE_IRQS_OFF |
6a2df3a8 | 596 | j io_return |
1da177e4 | 597 | |
753c4dd6 MS |
598 | # |
599 | # _TIF_NOTIFY_RESUME or is set, call do_notify_resume | |
600 | # | |
601 | io_notify_resume: | |
6a2df3a8 | 602 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
603 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
604 | lgr %r2,%r11 # pass pointer to pt_regs | |
605 | brasl %r14,do_notify_resume | |
606 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 607 | TRACE_IRQS_OFF |
6a2df3a8 | 608 | j io_return |
753c4dd6 | 609 | |
1da177e4 LT |
610 | /* |
611 | * External interrupt handler routine | |
612 | */ | |
144d634a | 613 | ENTRY(ext_int_handler) |
473e66ba | 614 | STCK __LC_INT_CLOCK |
9cfb9b3c | 615 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
616 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
617 | lg %r10,__LC_LAST_BREAK | |
618 | lg %r12,__LC_THREAD_INFO | |
619 | larl %r13,system_call | |
620 | lmg %r8,%r9,__LC_EXT_OLD_PSW | |
621 | HANDLE_SIE_INTERCEPT %r14 | |
622 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
623 | tmhh %r8,0x0001 # interrupting from user ? | |
624 | jz ext_skip | |
625 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
626 | LAST_BREAK %r14 | |
627 | ext_skip: | |
628 | stmg %r0,%r7,__PT_R0(%r11) | |
629 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
630 | stmg %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 631 | TRACE_IRQS_OFF |
0de9db37 | 632 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f6649a7e | 633 | lghi %r1,4096 |
c5328901 | 634 | lgr %r2,%r11 # pass pointer to pt_regs |
7e180bd8 | 635 | llgf %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code |
f6649a7e MS |
636 | llgf %r4,__LC_EXT_PARAMS # get external parameter |
637 | lg %r5,__LC_EXT_PARAMS2-4096(%r1) # get 64 bit external parameter | |
25d83cbf | 638 | brasl %r14,do_extint |
1da177e4 LT |
639 | j io_return |
640 | ||
4c1051e3 MS |
641 | /* |
642 | * Load idle PSW. The second "half" of this function is in cleanup_idle. | |
643 | */ | |
644 | ENTRY(psw_idle) | |
645 | stg %r4,__SF_EMPTY(%r15) | |
646 | larl %r1,psw_idle_lpsw+4 | |
647 | stg %r1,__SF_EMPTY+8(%r15) | |
648 | larl %r1,.Lvtimer_max | |
473e66ba | 649 | STCK __IDLE_ENTER(%r2) |
4c1051e3 MS |
650 | ltr %r5,%r5 |
651 | stpt __VQ_IDLE_ENTER(%r3) | |
652 | jz psw_idle_lpsw | |
653 | spt 0(%r1) | |
654 | psw_idle_lpsw: | |
655 | lpswe __SF_EMPTY(%r15) | |
656 | br %r14 | |
657 | psw_idle_end: | |
658 | ||
ae6aa2ea MS |
659 | __critical_end: |
660 | ||
1da177e4 LT |
661 | /* |
662 | * Machine check handler routines | |
663 | */ | |
144d634a | 664 | ENTRY(mcck_int_handler) |
473e66ba | 665 | STCK __LC_MCCK_CLOCK |
77fa2245 HC |
666 | la %r1,4095 # revalidate r1 |
667 | spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer | |
25d83cbf | 668 | lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs |
c5328901 MS |
669 | lg %r10,__LC_LAST_BREAK |
670 | lg %r12,__LC_THREAD_INFO | |
86f2552b | 671 | larl %r13,system_call |
c5328901 MS |
672 | lmg %r8,%r9,__LC_MCK_OLD_PSW |
673 | HANDLE_SIE_INTERCEPT %r14 | |
25d83cbf | 674 | tm __LC_MCCK_CODE,0x80 # system damage? |
c5328901 MS |
675 | jo mcck_panic # yes -> rest of mcck code invalid |
676 | lghi %r14,__LC_CPU_TIMER_SAVE_AREA | |
677 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
63b12246 | 678 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
c5328901 | 679 | jo 3f |
63b12246 MS |
680 | la %r14,__LC_SYNC_ENTER_TIMER |
681 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
682 | jl 0f | |
683 | la %r14,__LC_ASYNC_ENTER_TIMER | |
684 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 685 | jl 1f |
63b12246 | 686 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
687 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
688 | jl 2f | |
63b12246 | 689 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 690 | 2: spt 0(%r14) |
6377981f | 691 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c5328901 MS |
692 | 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
693 | jno mcck_panic # no -> skip cleanup critical | |
694 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT | |
695 | tm %r8,0x0001 # interrupting from user ? | |
696 | jz mcck_skip | |
697 | UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER | |
698 | LAST_BREAK %r14 | |
699 | mcck_skip: | |
700 | lghi %r14,__LC_GPREGS_SAVE_AREA | |
701 | mvc __PT_R0(128,%r11),0(%r14) | |
702 | stmg %r8,%r9,__PT_PSW(%r11) | |
703 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
704 | lgr %r2,%r11 # pass pointer to pt_regs | |
77fa2245 | 705 | brasl %r14,s390_do_machine_check |
c5328901 | 706 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
77fa2245 HC |
707 | jno mcck_return |
708 | lg %r1,__LC_KERNEL_STACK # switch to kernel stack | |
c5328901 MS |
709 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
710 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
711 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
712 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
77fa2245 | 713 | lgr %r15,%r1 |
c5328901 | 714 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
86f2552b | 715 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 716 | jno mcck_return |
1f194a4c | 717 | TRACE_IRQS_OFF |
77fa2245 | 718 | brasl %r14,s390_handle_mcck |
1f194a4c | 719 | TRACE_IRQS_ON |
1da177e4 | 720 | mcck_return: |
c5328901 MS |
721 | lg %r14,__LC_VDSO_PER_CPU |
722 | lmg %r0,%r10,__PT_R0(%r11) | |
723 | mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW | |
63b12246 MS |
724 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
725 | jno 0f | |
726 | stpt __LC_EXIT_TIMER | |
c5328901 MS |
727 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
728 | 0: lmg %r11,%r15,__PT_R11(%r11) | |
729 | lpswe __LC_RETURN_MCCK_PSW | |
730 | ||
731 | mcck_panic: | |
732 | lg %r14,__LC_PANIC_STACK | |
733 | slgr %r14,%r15 | |
734 | srag %r14,%r14,PAGE_SHIFT | |
735 | jz 0f | |
736 | lg %r15,__LC_PANIC_STACK | |
737 | 0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
738 | j mcck_skip | |
1da177e4 | 739 | |
7dd6b334 MH |
740 | # |
741 | # PSW restart interrupt handler | |
742 | # | |
8b646bd7 | 743 | ENTRY(restart_int_handler) |
c5328901 | 744 | stg %r15,__LC_SAVE_AREA_RESTART |
8b646bd7 | 745 | lg %r15,__LC_RESTART_STACK |
c5328901 | 746 | aghi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 747 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
748 | stmg %r0,%r14,__PT_R0(%r15) |
749 | mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART | |
750 | mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
751 | aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
752 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
753 | lg %r1,__LC_RESTART_FN # load fn, parm & source cpu |
754 | lg %r2,__LC_RESTART_DATA | |
755 | lg %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
756 | ltgr %r3,%r3 # test source cpu address |
757 | jm 1f # negative -> skip source stop | |
eb546195 | 758 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
759 | brc 10,0b # wait for status stored |
760 | 1: basr %r14,%r1 # call function | |
761 | stap __SF_EMPTY(%r15) # store cpu address | |
762 | llgh %r3,__SF_EMPTY(%r15) | |
eb546195 | 763 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
764 | brc 2,2b |
765 | 3: j 3b | |
7dd6b334 | 766 | |
860dba45 MS |
767 | .section .kprobes.text, "ax" |
768 | ||
1da177e4 LT |
769 | #ifdef CONFIG_CHECK_STACK |
770 | /* | |
771 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
772 | * No need to properly save the registers, we are going to panic anyway. | |
773 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
774 | */ | |
775 | stack_overflow: | |
c5328901 MS |
776 | lg %r11,__LC_PANIC_STACK # change to panic stack |
777 | aghi %r11,-__PT_SIZE # create pt_regs | |
778 | stmg %r0,%r7,__PT_R0(%r11) | |
779 | stmg %r8,%r9,__PT_PSW(%r11) | |
780 | mvc __PT_R8(64,%r11),0(%r14) | |
781 | stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 | |
782 | lgr %r15,%r11 | |
783 | aghi %r15,-STACK_FRAME_OVERHEAD | |
784 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
785 | lgr %r2,%r11 # pass pointer to pt_regs | |
1da177e4 LT |
786 | jg kernel_stack_overflow |
787 | #endif | |
788 | ||
c5328901 MS |
789 | .align 8 |
790 | cleanup_table: | |
791 | .quad system_call | |
792 | .quad sysc_do_svc | |
793 | .quad sysc_tif | |
794 | .quad sysc_restore | |
795 | .quad sysc_done | |
796 | .quad io_tif | |
797 | .quad io_restore | |
798 | .quad io_done | |
4c1051e3 MS |
799 | .quad psw_idle |
800 | .quad psw_idle_end | |
1da177e4 LT |
801 | |
802 | cleanup_critical: | |
c5328901 | 803 | clg %r9,BASED(cleanup_table) # system_call |
1da177e4 | 804 | jl 0f |
c5328901 | 805 | clg %r9,BASED(cleanup_table+8) # sysc_do_svc |
1da177e4 | 806 | jl cleanup_system_call |
c5328901 | 807 | clg %r9,BASED(cleanup_table+16) # sysc_tif |
1da177e4 | 808 | jl 0f |
c5328901 | 809 | clg %r9,BASED(cleanup_table+24) # sysc_restore |
6a2df3a8 | 810 | jl cleanup_sysc_tif |
c5328901 | 811 | clg %r9,BASED(cleanup_table+32) # sysc_done |
6a2df3a8 | 812 | jl cleanup_sysc_restore |
c5328901 | 813 | clg %r9,BASED(cleanup_table+40) # io_tif |
63b12246 | 814 | jl 0f |
c5328901 | 815 | clg %r9,BASED(cleanup_table+48) # io_restore |
6a2df3a8 | 816 | jl cleanup_io_tif |
c5328901 | 817 | clg %r9,BASED(cleanup_table+56) # io_done |
6a2df3a8 | 818 | jl cleanup_io_restore |
4c1051e3 MS |
819 | clg %r9,BASED(cleanup_table+64) # psw_idle |
820 | jl 0f | |
821 | clg %r9,BASED(cleanup_table+72) # psw_idle_end | |
822 | jl cleanup_idle | |
c5328901 MS |
823 | 0: br %r14 |
824 | ||
1da177e4 LT |
825 | |
826 | cleanup_system_call: | |
c5328901 MS |
827 | # check if stpt has been executed |
828 | clg %r9,BASED(cleanup_system_call_insn) | |
1da177e4 LT |
829 | jh 0f |
830 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
c5328901 | 831 | cghi %r11,__LC_SAVE_AREA_ASYNC |
6377981f | 832 | je 0f |
c5328901 MS |
833 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
834 | 0: # check if stmg has been executed | |
835 | clg %r9,BASED(cleanup_system_call_insn+8) | |
1da177e4 | 836 | jh 0f |
c5328901 MS |
837 | mvc __LC_SAVE_AREA_SYNC(64),0(%r11) |
838 | 0: # check if base register setup + TIF bit load has been done | |
839 | clg %r9,BASED(cleanup_system_call_insn+16) | |
840 | jhe 0f | |
841 | # set up saved registers r10 and r12 | |
842 | stg %r10,16(%r11) # r10 last break | |
843 | stg %r12,32(%r11) # r12 thread-info pointer | |
844 | 0: # check if the user time update has been done | |
845 | clg %r9,BASED(cleanup_system_call_insn+24) | |
846 | jh 0f | |
847 | lg %r15,__LC_EXIT_TIMER | |
848 | slg %r15,__LC_SYNC_ENTER_TIMER | |
849 | alg %r15,__LC_USER_TIMER | |
850 | stg %r15,__LC_USER_TIMER | |
851 | 0: # check if the system time update has been done | |
852 | clg %r9,BASED(cleanup_system_call_insn+32) | |
853 | jh 0f | |
854 | lg %r15,__LC_LAST_UPDATE_TIMER | |
855 | slg %r15,__LC_EXIT_TIMER | |
856 | alg %r15,__LC_SYSTEM_TIMER | |
857 | stg %r15,__LC_SYSTEM_TIMER | |
858 | 0: # update accounting time stamp | |
1da177e4 | 859 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
c5328901 MS |
860 | # do LAST_BREAK |
861 | lg %r9,16(%r11) | |
862 | srag %r9,%r9,23 | |
86f2552b | 863 | jz 0f |
c5328901 MS |
864 | mvc __TI_last_break(8,%r12),16(%r11) |
865 | 0: # set up saved register r11 | |
866 | lg %r15,__LC_KERNEL_STACK | |
867 | aghi %r15,-__PT_SIZE | |
868 | stg %r15,24(%r11) # r11 pt_regs pointer | |
869 | # fill pt_regs | |
870 | mvc __PT_R8(64,%r15),__LC_SAVE_AREA_SYNC | |
871 | stmg %r0,%r7,__PT_R0(%r15) | |
872 | mvc __PT_PSW(16,%r15),__LC_SVC_OLD_PSW | |
aa33c8cb | 873 | mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC |
c5328901 MS |
874 | # setup saved register r15 |
875 | aghi %r15,-STACK_FRAME_OVERHEAD | |
876 | stg %r15,56(%r11) # r15 stack pointer | |
877 | # set new psw address and exit | |
878 | larl %r9,sysc_do_svc | |
1da177e4 LT |
879 | br %r14 |
880 | cleanup_system_call_insn: | |
25d83cbf | 881 | .quad system_call |
c5328901 MS |
882 | .quad sysc_stmg |
883 | .quad sysc_per | |
884 | .quad sysc_vtime+18 | |
885 | .quad sysc_vtime+42 | |
1da177e4 | 886 | |
6a2df3a8 | 887 | cleanup_sysc_tif: |
c5328901 | 888 | larl %r9,sysc_tif |
1da177e4 LT |
889 | br %r14 |
890 | ||
6a2df3a8 | 891 | cleanup_sysc_restore: |
c5328901 | 892 | clg %r9,BASED(cleanup_sysc_restore_insn) |
6377981f | 893 | je 0f |
c5328901 MS |
894 | lg %r9,24(%r11) # get saved pointer to pt_regs |
895 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
896 | mvc 0(64,%r11),__PT_R8(%r9) | |
897 | lmg %r0,%r7,__PT_R0(%r9) | |
898 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
1da177e4 | 899 | br %r14 |
6a2df3a8 | 900 | cleanup_sysc_restore_insn: |
411788ea | 901 | .quad sysc_done - 4 |
1da177e4 | 902 | |
6a2df3a8 | 903 | cleanup_io_tif: |
c5328901 | 904 | larl %r9,io_tif |
176b1803 MS |
905 | br %r14 |
906 | ||
6a2df3a8 | 907 | cleanup_io_restore: |
c5328901 MS |
908 | clg %r9,BASED(cleanup_io_restore_insn) |
909 | je 0f | |
910 | lg %r9,24(%r11) # get saved r11 pointer to pt_regs | |
911 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
c5328901 MS |
912 | mvc 0(64,%r11),__PT_R8(%r9) |
913 | lmg %r0,%r7,__PT_R0(%r9) | |
914 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
ae6aa2ea | 915 | br %r14 |
6a2df3a8 | 916 | cleanup_io_restore_insn: |
411788ea | 917 | .quad io_done - 4 |
ae6aa2ea | 918 | |
4c1051e3 MS |
919 | cleanup_idle: |
920 | # copy interrupt clock & cpu timer | |
921 | mvc __IDLE_EXIT(8,%r2),__LC_INT_CLOCK | |
922 | mvc __VQ_IDLE_EXIT(8,%r3),__LC_ASYNC_ENTER_TIMER | |
923 | cghi %r11,__LC_SAVE_AREA_ASYNC | |
924 | je 0f | |
925 | mvc __IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK | |
926 | mvc __VQ_IDLE_EXIT(8,%r3),__LC_MCCK_ENTER_TIMER | |
927 | 0: # check if stck & stpt have been executed | |
928 | clg %r9,BASED(cleanup_idle_insn) | |
929 | jhe 1f | |
930 | mvc __IDLE_ENTER(8,%r2),__IDLE_EXIT(%r2) | |
931 | mvc __VQ_IDLE_ENTER(8,%r3),__VQ_IDLE_EXIT(%r3) | |
932 | j 2f | |
933 | 1: # check if the cpu timer has been reprogrammed | |
934 | ltr %r5,%r5 | |
935 | jz 2f | |
936 | spt __VQ_IDLE_ENTER(%r3) | |
937 | 2: # account system time going idle | |
938 | lg %r9,__LC_STEAL_TIMER | |
939 | alg %r9,__IDLE_ENTER(%r2) | |
940 | slg %r9,__LC_LAST_UPDATE_CLOCK | |
941 | stg %r9,__LC_STEAL_TIMER | |
942 | mvc __LC_LAST_UPDATE_CLOCK(8),__IDLE_EXIT(%r2) | |
943 | lg %r9,__LC_SYSTEM_TIMER | |
944 | alg %r9,__LC_LAST_UPDATE_TIMER | |
945 | slg %r9,__VQ_IDLE_ENTER(%r3) | |
946 | stg %r9,__LC_SYSTEM_TIMER | |
947 | mvc __LC_LAST_UPDATE_TIMER(8),__VQ_IDLE_EXIT(%r3) | |
948 | # prepare return psw | |
949 | nihh %r8,0xfffd # clear wait state bit | |
950 | lg %r9,48(%r11) # return from psw_idle | |
951 | br %r14 | |
952 | cleanup_idle_insn: | |
953 | .quad psw_idle_lpsw | |
954 | ||
1da177e4 LT |
955 | /* |
956 | * Integer constants | |
957 | */ | |
c5328901 | 958 | .align 8 |
1da177e4 | 959 | .Lcritical_start: |
c5328901 MS |
960 | .quad __critical_start |
961 | .Lcritical_length: | |
962 | .quad __critical_end - __critical_start | |
4c1051e3 MS |
963 | .Lvtimer_max: |
964 | .quad 0x7fffffffffffffff | |
c5328901 | 965 | |
1da177e4 | 966 | |
603d1a50 MS |
967 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
968 | /* | |
969 | * sie64a calling convention: | |
970 | * %r2 pointer to sie control block | |
971 | * %r3 guest register save area | |
972 | */ | |
144d634a | 973 | ENTRY(sie64a) |
603d1a50 MS |
974 | stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers |
975 | stg %r2,__SF_EMPTY(%r15) # save control block pointer | |
976 | stg %r3,__SF_EMPTY+8(%r15) # save guest register save area | |
ddd6f953 | 977 | xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # host id == 0 |
603d1a50 | 978 | lmg %r0,%r13,0(%r3) # load guest gprs 0-13 |
603d1a50 MS |
979 | sie_loop: |
980 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct | |
981 | tm __TI_flags+7(%r14),_TIF_EXIT_SIE | |
982 | jnz sie_exit | |
480e5926 CB |
983 | lg %r14,__LC_GMAP # get gmap pointer |
984 | ltgr %r14,%r14 | |
985 | jz sie_gmap | |
986 | lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce | |
987 | sie_gmap: | |
603d1a50 MS |
988 | lg %r14,__SF_EMPTY(%r15) # get control block pointer |
989 | SPP __SF_EMPTY(%r15) # set guest id | |
990 | sie 0(%r14) | |
991 | sie_done: | |
ddd6f953 | 992 | SPP __SF_EMPTY+16(%r15) # set host id |
603d1a50 MS |
993 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
994 | sie_exit: | |
480e5926 | 995 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
603d1a50 MS |
996 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
997 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
998 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
999 | lghi %r2,0 | |
1000 | br %r14 | |
1001 | sie_fault: | |
69ba9743 | 1002 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
603d1a50 | 1003 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
603d1a50 MS |
1004 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
1005 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
1006 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
1007 | lghi %r2,-EFAULT | |
1008 | br %r14 | |
1009 | ||
1010 | .align 8 | |
1011 | .Lsie_loop: | |
1012 | .quad sie_loop | |
c5328901 MS |
1013 | .Lsie_length: |
1014 | .quad sie_done - sie_loop | |
ddd6f953 MS |
1015 | .Lhost_id: |
1016 | .quad 0 | |
603d1a50 MS |
1017 | |
1018 | .section __ex_table,"a" | |
1019 | .quad sie_loop,sie_fault | |
1020 | .previous | |
1021 | #endif | |
1022 | ||
25d83cbf | 1023 | .section .rodata, "a" |
1da177e4 | 1024 | #define SYSCALL(esa,esame,emu) .long esame |
9bf1226b | 1025 | .globl sys_call_table |
1da177e4 LT |
1026 | sys_call_table: |
1027 | #include "syscalls.S" | |
1028 | #undef SYSCALL | |
1029 | ||
347a8dc3 | 1030 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
1031 | |
1032 | #define SYSCALL(esa,esame,emu) .long emu | |
1da177e4 LT |
1033 | sys_call_table_emu: |
1034 | #include "syscalls.S" | |
1035 | #undef SYSCALL | |
1036 | #endif |