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) | |
603d1a50 | 50 | _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) |
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 | |
ce6a04ac | 84 | .macro HANDLE_SIE_INTERCEPT scratch,pgmcheck |
c5328901 | 85 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
6022afc0 MS |
86 | tmhh %r8,0x0001 # interrupting from user ? |
87 | jnz .+42 | |
c5328901 MS |
88 | lgr \scratch,%r9 |
89 | slg \scratch,BASED(.Lsie_loop) | |
90 | clg \scratch,BASED(.Lsie_length) | |
ce6a04ac CB |
91 | .if \pgmcheck |
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 | |
95 | jh .+22 | |
96 | .else | |
6022afc0 | 97 | jhe .+22 |
ce6a04ac | 98 | .endif |
c5328901 | 99 | lg %r9,BASED(.Lsie_loop) |
23d18e8d | 100 | LPP BASED(.Lhost_id) # set host id |
c5328901 | 101 | #endif |
987ad70a MS |
102 | .endm |
103 | ||
c5328901 | 104 | .macro CHECK_STACK stacksize,savearea |
63b12246 | 105 | #ifdef CONFIG_CHECK_STACK |
c5328901 MS |
106 | tml %r15,\stacksize - CONFIG_STACK_GUARD |
107 | lghi %r14,\savearea | |
108 | jz stack_overflow | |
63b12246 | 109 | #endif |
63b12246 MS |
110 | .endm |
111 | ||
c5328901 MS |
112 | .macro SWITCH_ASYNC savearea,stack,shift |
113 | tmhh %r8,0x0001 # interrupting from user ? | |
114 | jnz 1f | |
115 | lgr %r14,%r9 | |
116 | slg %r14,BASED(.Lcritical_start) | |
117 | clg %r14,BASED(.Lcritical_length) | |
1da177e4 | 118 | jhe 0f |
c5328901 | 119 | lghi %r11,\savearea # inside critical section, do cleanup |
1da177e4 | 120 | brasl %r14,cleanup_critical |
c5328901 | 121 | tmhh %r8,0x0001 # retest problem state after cleanup |
1da177e4 | 122 | jnz 1f |
c5328901 | 123 | 0: lg %r14,\stack # are we already on the target stack? |
1da177e4 | 124 | slgr %r14,%r15 |
c5328901 | 125 | srag %r14,%r14,\shift |
86f2552b | 126 | jnz 1f |
c5328901 | 127 | CHECK_STACK 1<<\shift,\savearea |
dc7ee00d | 128 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
c5328901 MS |
129 | j 2f |
130 | 1: lg %r15,\stack # load target stack | |
dc7ee00d | 131 | 2: la %r11,STACK_FRAME_OVERHEAD(%r15) |
25d83cbf | 132 | .endm |
1da177e4 | 133 | |
c5328901 MS |
134 | .macro UPDATE_VTIME scratch,enter_timer |
135 | lg \scratch,__LC_EXIT_TIMER | |
136 | slg \scratch,\enter_timer | |
137 | alg \scratch,__LC_USER_TIMER | |
138 | stg \scratch,__LC_USER_TIMER | |
139 | lg \scratch,__LC_LAST_UPDATE_TIMER | |
140 | slg \scratch,__LC_EXIT_TIMER | |
141 | alg \scratch,__LC_SYSTEM_TIMER | |
142 | stg \scratch,__LC_SYSTEM_TIMER | |
143 | mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer | |
1da177e4 LT |
144 | .endm |
145 | ||
c5328901 MS |
146 | .macro LAST_BREAK scratch |
147 | srag \scratch,%r10,23 | |
148 | jz .+10 | |
149 | stg %r10,__TI_last_break(%r12) | |
86f2552b MS |
150 | .endm |
151 | ||
1e54622e | 152 | .macro REENABLE_IRQS |
c5328901 MS |
153 | stg %r8,__LC_RETURN_PSW |
154 | ni __LC_RETURN_PSW,0xbf | |
155 | ssm __LC_RETURN_PSW | |
1e54622e MS |
156 | .endm |
157 | ||
473e66ba | 158 | .macro STCK savearea |
d652d596 | 159 | #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES |
473e66ba HC |
160 | .insn s,0xb27c0000,\savearea # store clock fast |
161 | #else | |
162 | .insn s,0xb2050000,\savearea # store clock | |
163 | #endif | |
164 | .endm | |
165 | ||
860dba45 MS |
166 | .section .kprobes.text, "ax" |
167 | ||
1da177e4 LT |
168 | /* |
169 | * Scheduler resume function, called by switch_to | |
170 | * gpr2 = (task_struct *) prev | |
171 | * gpr3 = (task_struct *) next | |
172 | * Returns: | |
173 | * gpr2 = prev | |
174 | */ | |
144d634a | 175 | ENTRY(__switch_to) |
eda0c6d6 MS |
176 | stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
177 | stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev | |
5e9a2692 MS |
178 | lg %r4,__THREAD_info(%r2) # get thread_info of prev |
179 | lg %r5,__THREAD_info(%r3) # get thread_info of next | |
eda0c6d6 | 180 | lgr %r15,%r5 |
dc7ee00d | 181 | aghi %r15,STACK_INIT # end of kernel stack of next |
eda0c6d6 MS |
182 | stg %r3,__LC_CURRENT # store task struct of next |
183 | stg %r5,__LC_THREAD_INFO # store thread info of next | |
184 | stg %r15,__LC_KERNEL_STACK # store end of kernel stack | |
185 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
186 | mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next | |
187 | lg %r15,__THREAD_ksp(%r3) # load kernel stack of next | |
77fa2245 | 188 | tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending? |
5e9a2692 MS |
189 | jz 0f |
190 | ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
191 | oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next | |
eda0c6d6 | 192 | 0: lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
1da177e4 LT |
193 | br %r14 |
194 | ||
195 | __critical_start: | |
196 | /* | |
197 | * SVC interrupt handler routine. System calls are synchronous events and | |
198 | * are executed with interrupts enabled. | |
199 | */ | |
200 | ||
144d634a | 201 | ENTRY(system_call) |
c185b783 | 202 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
203 | sysc_stmg: |
204 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC | |
205 | lg %r10,__LC_LAST_BREAK | |
206 | lg %r12,__LC_THREAD_INFO | |
c5328901 MS |
207 | sysc_per: |
208 | lg %r15,__LC_KERNEL_STACK | |
c5328901 | 209 | la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs |
1da177e4 | 210 | sysc_vtime: |
c5328901 MS |
211 | UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER |
212 | LAST_BREAK %r13 | |
213 | stmg %r0,%r7,__PT_R0(%r11) | |
214 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
215 | mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW | |
aa33c8cb | 216 | mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
1da177e4 | 217 | sysc_do_svc: |
c5328901 | 218 | oi __TI_flags+7(%r12),_TIF_SYSCALL |
aa33c8cb | 219 | llgh %r8,__PT_INT_CODE+2(%r11) |
c5328901 | 220 | slag %r8,%r8,2 # shift and test for svc 0 |
1da177e4 LT |
221 | jnz sysc_nr_ok |
222 | # svc 0: system call number in %r1 | |
c5328901 | 223 | llgfr %r1,%r1 # clear high word in r1 |
86f2552b | 224 | cghi %r1,NR_syscalls |
1da177e4 | 225 | jnl sysc_nr_ok |
aa33c8cb | 226 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 | 227 | slag %r8,%r1,2 |
1da177e4 | 228 | sysc_nr_ok: |
c5328901 | 229 | larl %r10,sys_call_table # 64 bit system call table |
347a8dc3 | 230 | #ifdef CONFIG_COMPAT |
c5328901 | 231 | tm __TI_flags+5(%r12),(_TIF_31BIT>>16) |
c563077e | 232 | jno sysc_noemu |
c5328901 | 233 | larl %r10,sys_call_table_emu # 31 bit system call table |
1da177e4 LT |
234 | sysc_noemu: |
235 | #endif | |
c5328901 MS |
236 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
237 | stg %r2,__PT_ORIG_GPR2(%r11) | |
238 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
239 | lgf %r9,0(%r8,%r10) # get system call add. | |
b6ef5bb3 | 240 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 241 | jnz sysc_tracesys |
c5328901 MS |
242 | basr %r14,%r9 # call sys_xxxx |
243 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 LT |
244 | |
245 | sysc_return: | |
6a2df3a8 MS |
246 | LOCKDEP_SYS_EXIT |
247 | sysc_tif: | |
c5328901 | 248 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
b6ef5bb3 | 249 | jno sysc_restore |
86f2552b | 250 | tm __TI_flags+7(%r12),_TIF_WORK_SVC |
c5328901 | 251 | jnz sysc_work # check for work |
b6ef5bb3 | 252 | ni __TI_flags+7(%r12),255-_TIF_SYSCALL |
411788ea | 253 | sysc_restore: |
c5328901 MS |
254 | lg %r14,__LC_VDSO_PER_CPU |
255 | lmg %r0,%r10,__PT_R0(%r11) | |
256 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
257 | stpt __LC_EXIT_TIMER | |
258 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
259 | lmg %r11,%r15,__PT_R11(%r11) | |
260 | lpswe __LC_RETURN_PSW | |
411788ea HC |
261 | sysc_done: |
262 | ||
43d399d2 MS |
263 | # |
264 | # One of the work bits is on. Find out which one. | |
265 | # | |
b6ef5bb3 | 266 | sysc_work: |
86f2552b | 267 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 268 | jo sysc_mcck_pending |
86f2552b | 269 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 270 | jo sysc_reschedule |
39efd4ec MS |
271 | tm __TI_flags+7(%r12),_TIF_PER_TRAP |
272 | jo sysc_singlestep | |
86f2552b | 273 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 274 | jo sysc_sigpending |
86f2552b | 275 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 | 276 | jo sysc_notify_resume |
43d399d2 | 277 | j sysc_return # beware of critical section cleanup |
1da177e4 LT |
278 | |
279 | # | |
280 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
281 | # |
282 | sysc_reschedule: | |
6a2df3a8 | 283 | larl %r14,sysc_return |
c5328901 | 284 | jg schedule |
1da177e4 | 285 | |
77fa2245 HC |
286 | # |
287 | # _TIF_MCCK_PENDING is set, call handler | |
288 | # | |
289 | sysc_mcck_pending: | |
6a2df3a8 | 290 | larl %r14,sysc_return |
25d83cbf | 291 | jg s390_handle_mcck # TIF bit will be cleared by handler |
77fa2245 | 292 | |
1da177e4 | 293 | # |
02a029b3 | 294 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 295 | # |
25d83cbf | 296 | sysc_sigpending: |
c5328901 MS |
297 | lgr %r2,%r11 # pass pointer to pt_regs |
298 | brasl %r14,do_signal | |
b6ef5bb3 MS |
299 | tm __TI_flags+7(%r12),_TIF_SYSCALL |
300 | jno sysc_return | |
c5328901 MS |
301 | lmg %r2,%r7,__PT_R2(%r11) # load svc arguments |
302 | lghi %r8,0 # svc 0 returns -ENOSYS | |
450e47da | 303 | llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number |
b6ef5bb3 MS |
304 | cghi %r1,NR_syscalls |
305 | jnl sysc_nr_ok # invalid svc number -> do svc 0 | |
c5328901 | 306 | slag %r8,%r1,2 |
b6ef5bb3 | 307 | j sysc_nr_ok # restart svc |
1da177e4 | 308 | |
753c4dd6 MS |
309 | # |
310 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
311 | # | |
312 | sysc_notify_resume: | |
c5328901 | 313 | lgr %r2,%r11 # pass pointer to pt_regs |
6a2df3a8 | 314 | larl %r14,sysc_return |
c5328901 | 315 | jg do_notify_resume |
753c4dd6 | 316 | |
1da177e4 | 317 | # |
5e9a2692 | 318 | # _TIF_PER_TRAP is set, call do_per_trap |
1da177e4 LT |
319 | # |
320 | sysc_singlestep: | |
39efd4ec | 321 | ni __TI_flags+7(%r12),255-_TIF_PER_TRAP |
c5328901 MS |
322 | lgr %r2,%r11 # pass pointer to pt_regs |
323 | larl %r14,sysc_return | |
5e9a2692 | 324 | jg do_per_trap |
1da177e4 | 325 | |
1da177e4 | 326 | # |
753c4dd6 MS |
327 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
328 | # and after the system call | |
1da177e4 LT |
329 | # |
330 | sysc_tracesys: | |
c5328901 | 331 | lgr %r2,%r11 # pass pointer to pt_regs |
1da177e4 | 332 | la %r3,0 |
aa33c8cb | 333 | llgh %r0,__PT_INT_CODE+2(%r11) |
c5328901 | 334 | stg %r0,__PT_R2(%r11) |
753c4dd6 | 335 | brasl %r14,do_syscall_trace_enter |
1da177e4 | 336 | lghi %r0,NR_syscalls |
753c4dd6 | 337 | clgr %r0,%r2 |
1da177e4 | 338 | jnh sysc_tracenogo |
c5328901 MS |
339 | sllg %r8,%r2,2 |
340 | lgf %r9,0(%r8,%r10) | |
1da177e4 | 341 | sysc_tracego: |
c5328901 MS |
342 | lmg %r3,%r7,__PT_R3(%r11) |
343 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
344 | lg %r2,__PT_ORIG_GPR2(%r11) | |
345 | basr %r14,%r9 # call sys_xxx | |
346 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 | 347 | sysc_tracenogo: |
b6ef5bb3 | 348 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 349 | jz sysc_return |
c5328901 MS |
350 | lgr %r2,%r11 # pass pointer to pt_regs |
351 | larl %r14,sysc_return | |
753c4dd6 | 352 | jg do_syscall_trace_exit |
1da177e4 LT |
353 | |
354 | # | |
355 | # a new process exits the kernel with ret_from_fork | |
356 | # | |
144d634a | 357 | ENTRY(ret_from_fork) |
c5328901 MS |
358 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
359 | lg %r12,__LC_THREAD_INFO | |
37fe5d41 AV |
360 | brasl %r14,schedule_tail |
361 | TRACE_IRQS_ON | |
362 | ssm __LC_SVC_NEW_PSW # reenable interrupts | |
30dcb099 AV |
363 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? |
364 | jne sysc_tracenogo | |
365 | # it's a kernel thread | |
366 | lmg %r9,%r10,__PT_R9(%r11) # load gprs | |
37fe5d41 AV |
367 | ENTRY(kernel_thread_starter) |
368 | la %r2,0(%r10) | |
369 | basr %r14,%r9 | |
30dcb099 | 370 | j sysc_tracenogo |
1da177e4 LT |
371 | |
372 | /* | |
373 | * Program check handler routine | |
374 | */ | |
375 | ||
144d634a | 376 | ENTRY(pgm_check_handler) |
c185b783 | 377 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
378 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
379 | lg %r10,__LC_LAST_BREAK | |
380 | lg %r12,__LC_THREAD_INFO | |
381 | larl %r13,system_call | |
382 | lmg %r8,%r9,__LC_PGM_OLD_PSW | |
ce6a04ac | 383 | HANDLE_SIE_INTERCEPT %r14,1 |
c5328901 MS |
384 | tmhh %r8,0x0001 # test problem state bit |
385 | jnz 1f # -> fault in user space | |
386 | tmhh %r8,0x4000 # PER bit set in old PSW ? | |
387 | jnz 0f # -> enabled, can't be a double fault | |
388 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
389 | jnz pgm_svcper # -> single stepped svc | |
390 | 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC | |
dc7ee00d | 391 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
c5328901 MS |
392 | j 2f |
393 | 1: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER | |
394 | LAST_BREAK %r14 | |
395 | lg %r15,__LC_KERNEL_STACK | |
d35339a4 MS |
396 | lg %r14,__TI_task(%r12) |
397 | lghi %r13,__LC_PGM_TDB | |
398 | tm __LC_PGM_ILC+2,0x02 # check for transaction abort | |
399 | jz 2f | |
400 | mvc __THREAD_trap_tdb(256,%r14),0(%r13) | |
dc7ee00d | 401 | 2: la %r11,STACK_FRAME_OVERHEAD(%r15) |
c5328901 MS |
402 | stmg %r0,%r7,__PT_R0(%r11) |
403 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
404 | stmg %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
405 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
406 | mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE | |
c5328901 MS |
407 | stg %r10,__PT_ARGS(%r11) |
408 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
409 | jz 0f | |
c5328901 MS |
410 | tmhh %r8,0x0001 # kernel per event ? |
411 | jz pgm_kprobe | |
412 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
d35339a4 MS |
413 | mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS |
414 | mvc __THREAD_per_cause(2,%r14),__LC_PER_CAUSE | |
415 | mvc __THREAD_per_paid(1,%r14),__LC_PER_PAID | |
aa33c8cb | 416 | 0: REENABLE_IRQS |
c5328901 | 417 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f5cdac27 | 418 | larl %r1,pgm_check_table |
aa33c8cb MS |
419 | llgh %r10,__PT_INT_CODE+2(%r11) |
420 | nill %r10,0x007f | |
b01a37a7 | 421 | sll %r10,2 |
aa33c8cb | 422 | je sysc_return |
b01a37a7 | 423 | lgf %r1,0(%r10,%r1) # load address of handler routine |
c5328901 | 424 | lgr %r2,%r11 # pass pointer to pt_regs |
f5cdac27 | 425 | basr %r14,%r1 # branch to interrupt-handler |
f5cdac27 | 426 | j sysc_return |
1da177e4 LT |
427 | |
428 | # | |
c5328901 | 429 | # PER event in supervisor state, must be kprobes |
1da177e4 | 430 | # |
c5328901 MS |
431 | pgm_kprobe: |
432 | REENABLE_IRQS | |
433 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
434 | lgr %r2,%r11 # pass pointer to pt_regs | |
435 | brasl %r14,do_per_trap | |
436 | j sysc_return | |
1da177e4 | 437 | |
4ba069b8 | 438 | # |
c5328901 | 439 | # single stepped system call |
4ba069b8 | 440 | # |
c5328901 MS |
441 | pgm_svcper: |
442 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
443 | mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW | |
444 | larl %r14,sysc_per | |
445 | stg %r14,__LC_RETURN_PSW+8 | |
446 | lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs | |
4ba069b8 | 447 | |
1da177e4 LT |
448 | /* |
449 | * IO interrupt handler routine | |
450 | */ | |
144d634a | 451 | ENTRY(io_int_handler) |
473e66ba | 452 | STCK __LC_INT_CLOCK |
9cfb9b3c | 453 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
454 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
455 | lg %r10,__LC_LAST_BREAK | |
456 | lg %r12,__LC_THREAD_INFO | |
457 | larl %r13,system_call | |
458 | lmg %r8,%r9,__LC_IO_OLD_PSW | |
ce6a04ac | 459 | HANDLE_SIE_INTERCEPT %r14,0 |
c5328901 MS |
460 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT |
461 | tmhh %r8,0x0001 # interrupting from user? | |
462 | jz io_skip | |
463 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
464 | LAST_BREAK %r14 | |
465 | io_skip: | |
466 | stmg %r0,%r7,__PT_R0(%r11) | |
467 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
468 | stmg %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 469 | TRACE_IRQS_OFF |
c5328901 MS |
470 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
471 | lgr %r2,%r11 # pass pointer to pt_regs | |
472 | brasl %r14,do_IRQ | |
1da177e4 | 473 | io_return: |
6a2df3a8 MS |
474 | LOCKDEP_SYS_EXIT |
475 | TRACE_IRQS_ON | |
476 | io_tif: | |
86f2552b | 477 | tm __TI_flags+7(%r12),_TIF_WORK_INT |
25d83cbf | 478 | jnz io_work # there is work to do (signals etc.) |
411788ea | 479 | io_restore: |
c5328901 MS |
480 | lg %r14,__LC_VDSO_PER_CPU |
481 | lmg %r0,%r10,__PT_R0(%r11) | |
482 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
c5328901 MS |
483 | stpt __LC_EXIT_TIMER |
484 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
485 | lmg %r11,%r15,__PT_R11(%r11) | |
486 | lpswe __LC_RETURN_PSW | |
ae6aa2ea | 487 | io_done: |
1da177e4 | 488 | |
2688905e | 489 | # |
43d399d2 MS |
490 | # There is work todo, find out in which context we have been interrupted: |
491 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
492 | # 2) if we return to kernel code and kvm is enabled check if we need to | |
493 | # modify the psw to leave SIE | |
494 | # 3) if we return to kernel code and preemptive scheduling is enabled check | |
495 | # the preemption counter and if it is zero call preempt_schedule_irq | |
496 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
497 | # |
498 | io_work: | |
c5328901 | 499 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
43d399d2 | 500 | jo io_work_user # yes -> do resched & signal |
43d399d2 | 501 | #ifdef CONFIG_PREEMPT |
2688905e | 502 | # check for preemptive scheduling |
86f2552b | 503 | icm %r0,15,__TI_precount(%r12) |
2688905e | 504 | jnz io_restore # preemption is disabled |
6a2df3a8 MS |
505 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
506 | jno io_restore | |
1da177e4 | 507 | # switch to kernel stack |
c5328901 MS |
508 | lg %r1,__PT_R15(%r11) |
509 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
510 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
511 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
512 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 513 | lgr %r15,%r1 |
6a2df3a8 MS |
514 | # TRACE_IRQS_ON already done at io_return, call |
515 | # TRACE_IRQS_OFF to keep things symmetrical | |
516 | TRACE_IRQS_OFF | |
517 | brasl %r14,preempt_schedule_irq | |
518 | j io_return | |
519 | #else | |
43d399d2 | 520 | j io_restore |
6a2df3a8 | 521 | #endif |
1da177e4 | 522 | |
43d399d2 MS |
523 | # |
524 | # Need to do work before returning to userspace, switch to kernel stack | |
525 | # | |
2688905e | 526 | io_work_user: |
1da177e4 | 527 | lg %r1,__LC_KERNEL_STACK |
c5328901 MS |
528 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
529 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
530 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 531 | lgr %r15,%r1 |
43d399d2 | 532 | |
1da177e4 LT |
533 | # |
534 | # One of the work bits is on. Find out which one. | |
43d399d2 | 535 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
54dfe5dd | 536 | # and _TIF_MCCK_PENDING |
1da177e4 | 537 | # |
6a2df3a8 | 538 | io_work_tif: |
86f2552b | 539 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 540 | jo io_mcck_pending |
86f2552b | 541 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 542 | jo io_reschedule |
86f2552b | 543 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 544 | jo io_sigpending |
86f2552b | 545 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 MS |
546 | jo io_notify_resume |
547 | j io_return # beware of critical section cleanup | |
0eaeafa1 | 548 | |
77fa2245 HC |
549 | # |
550 | # _TIF_MCCK_PENDING is set, call handler | |
551 | # | |
552 | io_mcck_pending: | |
6a2df3a8 | 553 | # TRACE_IRQS_ON already done at io_return |
b771aeac | 554 | brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler |
6a2df3a8 MS |
555 | TRACE_IRQS_OFF |
556 | j io_return | |
77fa2245 | 557 | |
1da177e4 LT |
558 | # |
559 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
560 | # |
561 | io_reschedule: | |
6a2df3a8 | 562 | # TRACE_IRQS_ON already done at io_return |
c5328901 | 563 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 564 | brasl %r14,schedule # call scheduler |
c5328901 | 565 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 566 | TRACE_IRQS_OFF |
6a2df3a8 | 567 | j io_return |
1da177e4 LT |
568 | |
569 | # | |
02a029b3 | 570 | # _TIF_SIGPENDING or is set, call do_signal |
1da177e4 | 571 | # |
25d83cbf | 572 | io_sigpending: |
6a2df3a8 | 573 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
574 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
575 | lgr %r2,%r11 # pass pointer to pt_regs | |
576 | brasl %r14,do_signal | |
577 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
411788ea | 578 | TRACE_IRQS_OFF |
6a2df3a8 | 579 | j io_return |
1da177e4 | 580 | |
753c4dd6 MS |
581 | # |
582 | # _TIF_NOTIFY_RESUME or is set, call do_notify_resume | |
583 | # | |
584 | io_notify_resume: | |
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_notify_resume | |
589 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 590 | TRACE_IRQS_OFF |
6a2df3a8 | 591 | j io_return |
753c4dd6 | 592 | |
1da177e4 LT |
593 | /* |
594 | * External interrupt handler routine | |
595 | */ | |
144d634a | 596 | ENTRY(ext_int_handler) |
473e66ba | 597 | STCK __LC_INT_CLOCK |
9cfb9b3c | 598 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
599 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
600 | lg %r10,__LC_LAST_BREAK | |
601 | lg %r12,__LC_THREAD_INFO | |
602 | larl %r13,system_call | |
603 | lmg %r8,%r9,__LC_EXT_OLD_PSW | |
ce6a04ac | 604 | HANDLE_SIE_INTERCEPT %r14,0 |
c5328901 MS |
605 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT |
606 | tmhh %r8,0x0001 # interrupting from user ? | |
607 | jz ext_skip | |
608 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
609 | LAST_BREAK %r14 | |
610 | ext_skip: | |
611 | stmg %r0,%r7,__PT_R0(%r11) | |
612 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
613 | stmg %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 614 | TRACE_IRQS_OFF |
0de9db37 | 615 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f6649a7e | 616 | lghi %r1,4096 |
c5328901 | 617 | lgr %r2,%r11 # pass pointer to pt_regs |
7e180bd8 | 618 | llgf %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code |
f6649a7e MS |
619 | llgf %r4,__LC_EXT_PARAMS # get external parameter |
620 | lg %r5,__LC_EXT_PARAMS2-4096(%r1) # get 64 bit external parameter | |
25d83cbf | 621 | brasl %r14,do_extint |
1da177e4 LT |
622 | j io_return |
623 | ||
4c1051e3 MS |
624 | /* |
625 | * Load idle PSW. The second "half" of this function is in cleanup_idle. | |
626 | */ | |
627 | ENTRY(psw_idle) | |
27f6b416 | 628 | stg %r3,__SF_EMPTY(%r15) |
4c1051e3 MS |
629 | larl %r1,psw_idle_lpsw+4 |
630 | stg %r1,__SF_EMPTY+8(%r15) | |
27f6b416 MS |
631 | STCK __CLOCK_IDLE_ENTER(%r2) |
632 | stpt __TIMER_IDLE_ENTER(%r2) | |
4c1051e3 MS |
633 | psw_idle_lpsw: |
634 | lpswe __SF_EMPTY(%r15) | |
635 | br %r14 | |
636 | psw_idle_end: | |
637 | ||
ae6aa2ea MS |
638 | __critical_end: |
639 | ||
1da177e4 LT |
640 | /* |
641 | * Machine check handler routines | |
642 | */ | |
144d634a | 643 | ENTRY(mcck_int_handler) |
473e66ba | 644 | STCK __LC_MCCK_CLOCK |
77fa2245 HC |
645 | la %r1,4095 # revalidate r1 |
646 | spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer | |
25d83cbf | 647 | lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs |
c5328901 MS |
648 | lg %r10,__LC_LAST_BREAK |
649 | lg %r12,__LC_THREAD_INFO | |
86f2552b | 650 | larl %r13,system_call |
c5328901 | 651 | lmg %r8,%r9,__LC_MCK_OLD_PSW |
ce6a04ac | 652 | HANDLE_SIE_INTERCEPT %r14,0 |
25d83cbf | 653 | tm __LC_MCCK_CODE,0x80 # system damage? |
c5328901 MS |
654 | jo mcck_panic # yes -> rest of mcck code invalid |
655 | lghi %r14,__LC_CPU_TIMER_SAVE_AREA | |
656 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
63b12246 | 657 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
c5328901 | 658 | jo 3f |
63b12246 MS |
659 | la %r14,__LC_SYNC_ENTER_TIMER |
660 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
661 | jl 0f | |
662 | la %r14,__LC_ASYNC_ENTER_TIMER | |
663 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 664 | jl 1f |
63b12246 | 665 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
666 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
667 | jl 2f | |
63b12246 | 668 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 669 | 2: spt 0(%r14) |
6377981f | 670 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c5328901 MS |
671 | 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
672 | jno mcck_panic # no -> skip cleanup critical | |
673 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT | |
674 | tm %r8,0x0001 # interrupting from user ? | |
675 | jz mcck_skip | |
676 | UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER | |
677 | LAST_BREAK %r14 | |
678 | mcck_skip: | |
6551fbdf MS |
679 | lghi %r14,__LC_GPREGS_SAVE_AREA+64 |
680 | stmg %r0,%r7,__PT_R0(%r11) | |
681 | mvc __PT_R8(64,%r11),0(%r14) | |
c5328901 MS |
682 | stmg %r8,%r9,__PT_PSW(%r11) |
683 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
684 | lgr %r2,%r11 # pass pointer to pt_regs | |
77fa2245 | 685 | brasl %r14,s390_do_machine_check |
c5328901 | 686 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
77fa2245 HC |
687 | jno mcck_return |
688 | lg %r1,__LC_KERNEL_STACK # switch to kernel stack | |
c5328901 MS |
689 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
690 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
691 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
77fa2245 | 692 | lgr %r15,%r1 |
c5328901 | 693 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
86f2552b | 694 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 695 | jno mcck_return |
1f194a4c | 696 | TRACE_IRQS_OFF |
77fa2245 | 697 | brasl %r14,s390_handle_mcck |
1f194a4c | 698 | TRACE_IRQS_ON |
1da177e4 | 699 | mcck_return: |
c5328901 MS |
700 | lg %r14,__LC_VDSO_PER_CPU |
701 | lmg %r0,%r10,__PT_R0(%r11) | |
702 | mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW | |
63b12246 MS |
703 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
704 | jno 0f | |
705 | stpt __LC_EXIT_TIMER | |
c5328901 MS |
706 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
707 | 0: lmg %r11,%r15,__PT_R11(%r11) | |
708 | lpswe __LC_RETURN_MCCK_PSW | |
709 | ||
710 | mcck_panic: | |
711 | lg %r14,__LC_PANIC_STACK | |
712 | slgr %r14,%r15 | |
713 | srag %r14,%r14,PAGE_SHIFT | |
714 | jz 0f | |
715 | lg %r15,__LC_PANIC_STACK | |
716 | 0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
717 | j mcck_skip | |
1da177e4 | 718 | |
7dd6b334 MH |
719 | # |
720 | # PSW restart interrupt handler | |
721 | # | |
8b646bd7 | 722 | ENTRY(restart_int_handler) |
c5328901 | 723 | stg %r15,__LC_SAVE_AREA_RESTART |
8b646bd7 | 724 | lg %r15,__LC_RESTART_STACK |
c5328901 | 725 | aghi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 726 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
727 | stmg %r0,%r14,__PT_R0(%r15) |
728 | mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART | |
729 | mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
730 | aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
731 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
732 | lg %r1,__LC_RESTART_FN # load fn, parm & source cpu |
733 | lg %r2,__LC_RESTART_DATA | |
734 | lg %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
735 | ltgr %r3,%r3 # test source cpu address |
736 | jm 1f # negative -> skip source stop | |
eb546195 | 737 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
738 | brc 10,0b # wait for status stored |
739 | 1: basr %r14,%r1 # call function | |
740 | stap __SF_EMPTY(%r15) # store cpu address | |
741 | llgh %r3,__SF_EMPTY(%r15) | |
eb546195 | 742 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
743 | brc 2,2b |
744 | 3: j 3b | |
7dd6b334 | 745 | |
860dba45 MS |
746 | .section .kprobes.text, "ax" |
747 | ||
1da177e4 LT |
748 | #ifdef CONFIG_CHECK_STACK |
749 | /* | |
750 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
751 | * No need to properly save the registers, we are going to panic anyway. | |
752 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
753 | */ | |
754 | stack_overflow: | |
dc7ee00d MS |
755 | lg %r15,__LC_PANIC_STACK # change to panic stack |
756 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
c5328901 MS |
757 | stmg %r0,%r7,__PT_R0(%r11) |
758 | stmg %r8,%r9,__PT_PSW(%r11) | |
759 | mvc __PT_R8(64,%r11),0(%r14) | |
760 | stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 | |
c5328901 MS |
761 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
762 | lgr %r2,%r11 # pass pointer to pt_regs | |
1da177e4 LT |
763 | jg kernel_stack_overflow |
764 | #endif | |
765 | ||
c5328901 MS |
766 | .align 8 |
767 | cleanup_table: | |
768 | .quad system_call | |
769 | .quad sysc_do_svc | |
770 | .quad sysc_tif | |
771 | .quad sysc_restore | |
772 | .quad sysc_done | |
773 | .quad io_tif | |
774 | .quad io_restore | |
775 | .quad io_done | |
4c1051e3 MS |
776 | .quad psw_idle |
777 | .quad psw_idle_end | |
1da177e4 LT |
778 | |
779 | cleanup_critical: | |
c5328901 | 780 | clg %r9,BASED(cleanup_table) # system_call |
1da177e4 | 781 | jl 0f |
c5328901 | 782 | clg %r9,BASED(cleanup_table+8) # sysc_do_svc |
1da177e4 | 783 | jl cleanup_system_call |
c5328901 | 784 | clg %r9,BASED(cleanup_table+16) # sysc_tif |
1da177e4 | 785 | jl 0f |
c5328901 | 786 | clg %r9,BASED(cleanup_table+24) # sysc_restore |
6a2df3a8 | 787 | jl cleanup_sysc_tif |
c5328901 | 788 | clg %r9,BASED(cleanup_table+32) # sysc_done |
6a2df3a8 | 789 | jl cleanup_sysc_restore |
c5328901 | 790 | clg %r9,BASED(cleanup_table+40) # io_tif |
63b12246 | 791 | jl 0f |
c5328901 | 792 | clg %r9,BASED(cleanup_table+48) # io_restore |
6a2df3a8 | 793 | jl cleanup_io_tif |
c5328901 | 794 | clg %r9,BASED(cleanup_table+56) # io_done |
6a2df3a8 | 795 | jl cleanup_io_restore |
4c1051e3 MS |
796 | clg %r9,BASED(cleanup_table+64) # psw_idle |
797 | jl 0f | |
798 | clg %r9,BASED(cleanup_table+72) # psw_idle_end | |
799 | jl cleanup_idle | |
c5328901 MS |
800 | 0: br %r14 |
801 | ||
1da177e4 LT |
802 | |
803 | cleanup_system_call: | |
c5328901 MS |
804 | # check if stpt has been executed |
805 | clg %r9,BASED(cleanup_system_call_insn) | |
1da177e4 LT |
806 | jh 0f |
807 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
c5328901 | 808 | cghi %r11,__LC_SAVE_AREA_ASYNC |
6377981f | 809 | je 0f |
c5328901 MS |
810 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
811 | 0: # check if stmg has been executed | |
812 | clg %r9,BASED(cleanup_system_call_insn+8) | |
1da177e4 | 813 | jh 0f |
c5328901 MS |
814 | mvc __LC_SAVE_AREA_SYNC(64),0(%r11) |
815 | 0: # check if base register setup + TIF bit load has been done | |
816 | clg %r9,BASED(cleanup_system_call_insn+16) | |
817 | jhe 0f | |
818 | # set up saved registers r10 and r12 | |
819 | stg %r10,16(%r11) # r10 last break | |
820 | stg %r12,32(%r11) # r12 thread-info pointer | |
821 | 0: # check if the user time update has been done | |
822 | clg %r9,BASED(cleanup_system_call_insn+24) | |
823 | jh 0f | |
824 | lg %r15,__LC_EXIT_TIMER | |
825 | slg %r15,__LC_SYNC_ENTER_TIMER | |
826 | alg %r15,__LC_USER_TIMER | |
827 | stg %r15,__LC_USER_TIMER | |
828 | 0: # check if the system time update has been done | |
829 | clg %r9,BASED(cleanup_system_call_insn+32) | |
830 | jh 0f | |
831 | lg %r15,__LC_LAST_UPDATE_TIMER | |
832 | slg %r15,__LC_EXIT_TIMER | |
833 | alg %r15,__LC_SYSTEM_TIMER | |
834 | stg %r15,__LC_SYSTEM_TIMER | |
835 | 0: # update accounting time stamp | |
1da177e4 | 836 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
c5328901 MS |
837 | # do LAST_BREAK |
838 | lg %r9,16(%r11) | |
839 | srag %r9,%r9,23 | |
86f2552b | 840 | jz 0f |
c5328901 MS |
841 | mvc __TI_last_break(8,%r12),16(%r11) |
842 | 0: # set up saved register r11 | |
843 | lg %r15,__LC_KERNEL_STACK | |
dc7ee00d MS |
844 | la %r9,STACK_FRAME_OVERHEAD(%r15) |
845 | stg %r9,24(%r11) # r11 pt_regs pointer | |
c5328901 | 846 | # fill pt_regs |
dc7ee00d MS |
847 | mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC |
848 | stmg %r0,%r7,__PT_R0(%r9) | |
849 | mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW | |
850 | mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC | |
c5328901 | 851 | # setup saved register r15 |
c5328901 MS |
852 | stg %r15,56(%r11) # r15 stack pointer |
853 | # set new psw address and exit | |
854 | larl %r9,sysc_do_svc | |
1da177e4 LT |
855 | br %r14 |
856 | cleanup_system_call_insn: | |
25d83cbf | 857 | .quad system_call |
c5328901 MS |
858 | .quad sysc_stmg |
859 | .quad sysc_per | |
860 | .quad sysc_vtime+18 | |
861 | .quad sysc_vtime+42 | |
1da177e4 | 862 | |
6a2df3a8 | 863 | cleanup_sysc_tif: |
c5328901 | 864 | larl %r9,sysc_tif |
1da177e4 LT |
865 | br %r14 |
866 | ||
6a2df3a8 | 867 | cleanup_sysc_restore: |
c5328901 | 868 | clg %r9,BASED(cleanup_sysc_restore_insn) |
6377981f | 869 | je 0f |
c5328901 MS |
870 | lg %r9,24(%r11) # get saved pointer to pt_regs |
871 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
872 | mvc 0(64,%r11),__PT_R8(%r9) | |
873 | lmg %r0,%r7,__PT_R0(%r9) | |
874 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
1da177e4 | 875 | br %r14 |
6a2df3a8 | 876 | cleanup_sysc_restore_insn: |
411788ea | 877 | .quad sysc_done - 4 |
1da177e4 | 878 | |
6a2df3a8 | 879 | cleanup_io_tif: |
c5328901 | 880 | larl %r9,io_tif |
176b1803 MS |
881 | br %r14 |
882 | ||
6a2df3a8 | 883 | cleanup_io_restore: |
c5328901 MS |
884 | clg %r9,BASED(cleanup_io_restore_insn) |
885 | je 0f | |
886 | lg %r9,24(%r11) # get saved r11 pointer to pt_regs | |
887 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
c5328901 MS |
888 | mvc 0(64,%r11),__PT_R8(%r9) |
889 | lmg %r0,%r7,__PT_R0(%r9) | |
890 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
ae6aa2ea | 891 | br %r14 |
6a2df3a8 | 892 | cleanup_io_restore_insn: |
411788ea | 893 | .quad io_done - 4 |
ae6aa2ea | 894 | |
4c1051e3 MS |
895 | cleanup_idle: |
896 | # copy interrupt clock & cpu timer | |
27f6b416 MS |
897 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK |
898 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER | |
4c1051e3 MS |
899 | cghi %r11,__LC_SAVE_AREA_ASYNC |
900 | je 0f | |
27f6b416 MS |
901 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK |
902 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER | |
4c1051e3 MS |
903 | 0: # check if stck & stpt have been executed |
904 | clg %r9,BASED(cleanup_idle_insn) | |
905 | jhe 1f | |
27f6b416 MS |
906 | mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) |
907 | mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) | |
908 | 1: # account system time going idle | |
4c1051e3 | 909 | lg %r9,__LC_STEAL_TIMER |
27f6b416 | 910 | alg %r9,__CLOCK_IDLE_ENTER(%r2) |
4c1051e3 MS |
911 | slg %r9,__LC_LAST_UPDATE_CLOCK |
912 | stg %r9,__LC_STEAL_TIMER | |
27f6b416 | 913 | mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) |
4c1051e3 MS |
914 | lg %r9,__LC_SYSTEM_TIMER |
915 | alg %r9,__LC_LAST_UPDATE_TIMER | |
27f6b416 | 916 | slg %r9,__TIMER_IDLE_ENTER(%r2) |
4c1051e3 | 917 | stg %r9,__LC_SYSTEM_TIMER |
27f6b416 | 918 | mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) |
4c1051e3 MS |
919 | # prepare return psw |
920 | nihh %r8,0xfffd # clear wait state bit | |
921 | lg %r9,48(%r11) # return from psw_idle | |
922 | br %r14 | |
923 | cleanup_idle_insn: | |
924 | .quad psw_idle_lpsw | |
925 | ||
1da177e4 LT |
926 | /* |
927 | * Integer constants | |
928 | */ | |
c5328901 | 929 | .align 8 |
1da177e4 | 930 | .Lcritical_start: |
c5328901 MS |
931 | .quad __critical_start |
932 | .Lcritical_length: | |
933 | .quad __critical_end - __critical_start | |
934 | ||
1da177e4 | 935 | |
603d1a50 MS |
936 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
937 | /* | |
938 | * sie64a calling convention: | |
939 | * %r2 pointer to sie control block | |
940 | * %r3 guest register save area | |
941 | */ | |
144d634a | 942 | ENTRY(sie64a) |
603d1a50 MS |
943 | stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers |
944 | stg %r2,__SF_EMPTY(%r15) # save control block pointer | |
945 | stg %r3,__SF_EMPTY+8(%r15) # save guest register save area | |
ddd6f953 | 946 | xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # host id == 0 |
603d1a50 | 947 | lmg %r0,%r13,0(%r3) # load guest gprs 0-13 |
ce6a04ac CB |
948 | # some program checks are suppressing. C code (e.g. do_protection_exception) |
949 | # will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other | |
950 | # instructions in the sie_loop should not cause program interrupts. So | |
951 | # lets use a nop (47 00 00 00) as a landing pad. | |
952 | # See also HANDLE_SIE_INTERCEPT | |
953 | rewind_pad: | |
954 | nop 0 | |
603d1a50 MS |
955 | sie_loop: |
956 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct | |
957 | tm __TI_flags+7(%r14),_TIF_EXIT_SIE | |
958 | jnz sie_exit | |
480e5926 CB |
959 | lg %r14,__LC_GMAP # get gmap pointer |
960 | ltgr %r14,%r14 | |
961 | jz sie_gmap | |
962 | lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce | |
963 | sie_gmap: | |
603d1a50 | 964 | lg %r14,__SF_EMPTY(%r15) # get control block pointer |
23d18e8d | 965 | LPP __SF_EMPTY(%r15) # set guest id |
603d1a50 MS |
966 | sie 0(%r14) |
967 | sie_done: | |
23d18e8d | 968 | LPP __SF_EMPTY+16(%r15) # set host id |
603d1a50 MS |
969 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
970 | sie_exit: | |
480e5926 | 971 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
603d1a50 MS |
972 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
973 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
974 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
975 | lghi %r2,0 | |
976 | br %r14 | |
977 | sie_fault: | |
69ba9743 | 978 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
603d1a50 | 979 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
603d1a50 MS |
980 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
981 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
982 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
983 | lghi %r2,-EFAULT | |
984 | br %r14 | |
985 | ||
986 | .align 8 | |
987 | .Lsie_loop: | |
988 | .quad sie_loop | |
c5328901 MS |
989 | .Lsie_length: |
990 | .quad sie_done - sie_loop | |
ddd6f953 MS |
991 | .Lhost_id: |
992 | .quad 0 | |
603d1a50 | 993 | |
ce6a04ac | 994 | EX_TABLE(rewind_pad,sie_fault) |
eb608fb3 | 995 | EX_TABLE(sie_loop,sie_fault) |
603d1a50 MS |
996 | #endif |
997 | ||
25d83cbf | 998 | .section .rodata, "a" |
1da177e4 | 999 | #define SYSCALL(esa,esame,emu) .long esame |
9bf1226b | 1000 | .globl sys_call_table |
1da177e4 LT |
1001 | sys_call_table: |
1002 | #include "syscalls.S" | |
1003 | #undef SYSCALL | |
1004 | ||
347a8dc3 | 1005 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
1006 | |
1007 | #define SYSCALL(esa,esame,emu) .long emu | |
1da177e4 LT |
1008 | sys_call_table_emu: |
1009 | #include "syscalls.S" | |
1010 | #undef SYSCALL | |
1011 | #endif |