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 | |
42 | ||
753c4dd6 | 43 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
b6ef5bb3 | 44 | _TIF_MCCK_PENDING | _TIF_PER_TRAP ) |
753c4dd6 | 45 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 46 | _TIF_MCCK_PENDING) |
b6ef5bb3 MS |
47 | _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
48 | _TIF_SYSCALL_TRACEPOINT) | |
603d1a50 | 49 | _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) |
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 | |
ce6a04ac | 83 | .macro HANDLE_SIE_INTERCEPT scratch,pgmcheck |
c5328901 | 84 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
6022afc0 MS |
85 | tmhh %r8,0x0001 # interrupting from user ? |
86 | jnz .+42 | |
c5328901 MS |
87 | lgr \scratch,%r9 |
88 | slg \scratch,BASED(.Lsie_loop) | |
89 | clg \scratch,BASED(.Lsie_length) | |
ce6a04ac CB |
90 | .if \pgmcheck |
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 | |
94 | jh .+22 | |
95 | .else | |
6022afc0 | 96 | jhe .+22 |
ce6a04ac | 97 | .endif |
c5328901 | 98 | lg %r9,BASED(.Lsie_loop) |
23d18e8d | 99 | LPP BASED(.Lhost_id) # set host id |
c5328901 | 100 | #endif |
987ad70a MS |
101 | .endm |
102 | ||
c5328901 | 103 | .macro CHECK_STACK stacksize,savearea |
63b12246 | 104 | #ifdef CONFIG_CHECK_STACK |
c5328901 MS |
105 | tml %r15,\stacksize - CONFIG_STACK_GUARD |
106 | lghi %r14,\savearea | |
107 | jz stack_overflow | |
63b12246 | 108 | #endif |
63b12246 MS |
109 | .endm |
110 | ||
c5328901 MS |
111 | .macro SWITCH_ASYNC savearea,stack,shift |
112 | tmhh %r8,0x0001 # interrupting from user ? | |
113 | jnz 1f | |
114 | lgr %r14,%r9 | |
115 | slg %r14,BASED(.Lcritical_start) | |
116 | clg %r14,BASED(.Lcritical_length) | |
1da177e4 | 117 | jhe 0f |
c5328901 | 118 | lghi %r11,\savearea # inside critical section, do cleanup |
1da177e4 | 119 | brasl %r14,cleanup_critical |
c5328901 | 120 | tmhh %r8,0x0001 # retest problem state after cleanup |
1da177e4 | 121 | jnz 1f |
c5328901 | 122 | 0: lg %r14,\stack # are we already on the target stack? |
1da177e4 | 123 | slgr %r14,%r15 |
c5328901 | 124 | srag %r14,%r14,\shift |
86f2552b | 125 | jnz 1f |
c5328901 MS |
126 | CHECK_STACK 1<<\shift,\savearea |
127 | j 2f | |
128 | 1: lg %r15,\stack # load target stack | |
129 | 2: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
130 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
25d83cbf | 131 | .endm |
1da177e4 | 132 | |
c5328901 MS |
133 | .macro UPDATE_VTIME scratch,enter_timer |
134 | lg \scratch,__LC_EXIT_TIMER | |
135 | slg \scratch,\enter_timer | |
136 | alg \scratch,__LC_USER_TIMER | |
137 | stg \scratch,__LC_USER_TIMER | |
138 | lg \scratch,__LC_LAST_UPDATE_TIMER | |
139 | slg \scratch,__LC_EXIT_TIMER | |
140 | alg \scratch,__LC_SYSTEM_TIMER | |
141 | stg \scratch,__LC_SYSTEM_TIMER | |
142 | mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer | |
1da177e4 LT |
143 | .endm |
144 | ||
c5328901 MS |
145 | .macro LAST_BREAK scratch |
146 | srag \scratch,%r10,23 | |
147 | jz .+10 | |
148 | stg %r10,__TI_last_break(%r12) | |
86f2552b MS |
149 | .endm |
150 | ||
1e54622e | 151 | .macro REENABLE_IRQS |
c5328901 MS |
152 | stg %r8,__LC_RETURN_PSW |
153 | ni __LC_RETURN_PSW,0xbf | |
154 | ssm __LC_RETURN_PSW | |
1e54622e MS |
155 | .endm |
156 | ||
473e66ba | 157 | .macro STCK savearea |
d652d596 | 158 | #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES |
473e66ba HC |
159 | .insn s,0xb27c0000,\savearea # store clock fast |
160 | #else | |
161 | .insn s,0xb2050000,\savearea # store clock | |
162 | #endif | |
163 | .endm | |
164 | ||
860dba45 MS |
165 | .section .kprobes.text, "ax" |
166 | ||
1da177e4 LT |
167 | /* |
168 | * Scheduler resume function, called by switch_to | |
169 | * gpr2 = (task_struct *) prev | |
170 | * gpr3 = (task_struct *) next | |
171 | * Returns: | |
172 | * gpr2 = prev | |
173 | */ | |
144d634a | 174 | ENTRY(__switch_to) |
eda0c6d6 MS |
175 | stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
176 | stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev | |
5e9a2692 MS |
177 | lg %r4,__THREAD_info(%r2) # get thread_info of prev |
178 | lg %r5,__THREAD_info(%r3) # get thread_info of next | |
eda0c6d6 MS |
179 | lgr %r15,%r5 |
180 | aghi %r15,STACK_SIZE # end of kernel stack of next | |
181 | stg %r3,__LC_CURRENT # store task struct of next | |
182 | stg %r5,__LC_THREAD_INFO # store thread info of next | |
183 | stg %r15,__LC_KERNEL_STACK # store end of kernel stack | |
184 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
185 | mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next | |
186 | lg %r15,__THREAD_ksp(%r3) # load kernel stack of next | |
77fa2245 | 187 | tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending? |
5e9a2692 MS |
188 | jz 0f |
189 | ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
190 | oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next | |
eda0c6d6 | 191 | 0: lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
1da177e4 LT |
192 | br %r14 |
193 | ||
194 | __critical_start: | |
195 | /* | |
196 | * SVC interrupt handler routine. System calls are synchronous events and | |
197 | * are executed with interrupts enabled. | |
198 | */ | |
199 | ||
144d634a | 200 | ENTRY(system_call) |
c185b783 | 201 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
202 | sysc_stmg: |
203 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC | |
204 | lg %r10,__LC_LAST_BREAK | |
205 | lg %r12,__LC_THREAD_INFO | |
206 | larl %r13,system_call | |
207 | sysc_per: | |
208 | lg %r15,__LC_KERNEL_STACK | |
209 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
210 | la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs | |
1da177e4 | 211 | sysc_vtime: |
c5328901 MS |
212 | UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER |
213 | LAST_BREAK %r13 | |
214 | stmg %r0,%r7,__PT_R0(%r11) | |
215 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
216 | mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW | |
aa33c8cb | 217 | mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
1da177e4 | 218 | sysc_do_svc: |
c5328901 | 219 | oi __TI_flags+7(%r12),_TIF_SYSCALL |
aa33c8cb | 220 | llgh %r8,__PT_INT_CODE+2(%r11) |
c5328901 | 221 | slag %r8,%r8,2 # shift and test for svc 0 |
1da177e4 LT |
222 | jnz sysc_nr_ok |
223 | # svc 0: system call number in %r1 | |
c5328901 | 224 | llgfr %r1,%r1 # clear high word in r1 |
86f2552b | 225 | cghi %r1,NR_syscalls |
1da177e4 | 226 | jnl sysc_nr_ok |
aa33c8cb | 227 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 | 228 | slag %r8,%r1,2 |
1da177e4 | 229 | sysc_nr_ok: |
c5328901 | 230 | larl %r10,sys_call_table # 64 bit system call table |
347a8dc3 | 231 | #ifdef CONFIG_COMPAT |
c5328901 | 232 | tm __TI_flags+5(%r12),(_TIF_31BIT>>16) |
c563077e | 233 | jno sysc_noemu |
c5328901 | 234 | larl %r10,sys_call_table_emu # 31 bit system call table |
1da177e4 LT |
235 | sysc_noemu: |
236 | #endif | |
c5328901 MS |
237 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
238 | stg %r2,__PT_ORIG_GPR2(%r11) | |
239 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
240 | lgf %r9,0(%r8,%r10) # get system call add. | |
b6ef5bb3 | 241 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 242 | jnz sysc_tracesys |
c5328901 MS |
243 | basr %r14,%r9 # call sys_xxxx |
244 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 LT |
245 | |
246 | sysc_return: | |
6a2df3a8 MS |
247 | LOCKDEP_SYS_EXIT |
248 | sysc_tif: | |
c5328901 | 249 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
b6ef5bb3 | 250 | jno sysc_restore |
86f2552b | 251 | tm __TI_flags+7(%r12),_TIF_WORK_SVC |
c5328901 | 252 | jnz sysc_work # check for work |
b6ef5bb3 | 253 | ni __TI_flags+7(%r12),255-_TIF_SYSCALL |
411788ea | 254 | sysc_restore: |
c5328901 MS |
255 | lg %r14,__LC_VDSO_PER_CPU |
256 | lmg %r0,%r10,__PT_R0(%r11) | |
257 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
258 | stpt __LC_EXIT_TIMER | |
259 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
260 | lmg %r11,%r15,__PT_R11(%r11) | |
261 | lpswe __LC_RETURN_PSW | |
411788ea HC |
262 | sysc_done: |
263 | ||
43d399d2 MS |
264 | # |
265 | # One of the work bits is on. Find out which one. | |
266 | # | |
b6ef5bb3 | 267 | sysc_work: |
86f2552b | 268 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 269 | jo sysc_mcck_pending |
86f2552b | 270 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 271 | jo sysc_reschedule |
39efd4ec MS |
272 | tm __TI_flags+7(%r12),_TIF_PER_TRAP |
273 | jo sysc_singlestep | |
86f2552b | 274 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 275 | jo sysc_sigpending |
86f2552b | 276 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 | 277 | jo sysc_notify_resume |
43d399d2 | 278 | j sysc_return # beware of critical section cleanup |
1da177e4 LT |
279 | |
280 | # | |
281 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
282 | # |
283 | sysc_reschedule: | |
6a2df3a8 | 284 | larl %r14,sysc_return |
c5328901 | 285 | jg schedule |
1da177e4 | 286 | |
77fa2245 HC |
287 | # |
288 | # _TIF_MCCK_PENDING is set, call handler | |
289 | # | |
290 | sysc_mcck_pending: | |
6a2df3a8 | 291 | larl %r14,sysc_return |
25d83cbf | 292 | jg s390_handle_mcck # TIF bit will be cleared by handler |
77fa2245 | 293 | |
1da177e4 | 294 | # |
02a029b3 | 295 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 296 | # |
25d83cbf | 297 | sysc_sigpending: |
c5328901 MS |
298 | lgr %r2,%r11 # pass pointer to pt_regs |
299 | brasl %r14,do_signal | |
b6ef5bb3 MS |
300 | tm __TI_flags+7(%r12),_TIF_SYSCALL |
301 | jno sysc_return | |
c5328901 MS |
302 | lmg %r2,%r7,__PT_R2(%r11) # load svc arguments |
303 | lghi %r8,0 # svc 0 returns -ENOSYS | |
450e47da | 304 | llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number |
b6ef5bb3 MS |
305 | cghi %r1,NR_syscalls |
306 | jnl sysc_nr_ok # invalid svc number -> do svc 0 | |
c5328901 | 307 | slag %r8,%r1,2 |
b6ef5bb3 | 308 | j sysc_nr_ok # restart svc |
1da177e4 | 309 | |
753c4dd6 MS |
310 | # |
311 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
312 | # | |
313 | sysc_notify_resume: | |
c5328901 | 314 | lgr %r2,%r11 # pass pointer to pt_regs |
6a2df3a8 | 315 | larl %r14,sysc_return |
c5328901 | 316 | jg do_notify_resume |
753c4dd6 | 317 | |
1da177e4 | 318 | # |
5e9a2692 | 319 | # _TIF_PER_TRAP is set, call do_per_trap |
1da177e4 LT |
320 | # |
321 | sysc_singlestep: | |
39efd4ec | 322 | ni __TI_flags+7(%r12),255-_TIF_PER_TRAP |
c5328901 MS |
323 | lgr %r2,%r11 # pass pointer to pt_regs |
324 | larl %r14,sysc_return | |
5e9a2692 | 325 | jg do_per_trap |
1da177e4 | 326 | |
1da177e4 | 327 | # |
753c4dd6 MS |
328 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
329 | # and after the system call | |
1da177e4 LT |
330 | # |
331 | sysc_tracesys: | |
c5328901 | 332 | lgr %r2,%r11 # pass pointer to pt_regs |
1da177e4 | 333 | la %r3,0 |
aa33c8cb | 334 | llgh %r0,__PT_INT_CODE+2(%r11) |
c5328901 | 335 | stg %r0,__PT_R2(%r11) |
753c4dd6 | 336 | brasl %r14,do_syscall_trace_enter |
1da177e4 | 337 | lghi %r0,NR_syscalls |
753c4dd6 | 338 | clgr %r0,%r2 |
1da177e4 | 339 | jnh sysc_tracenogo |
c5328901 MS |
340 | sllg %r8,%r2,2 |
341 | lgf %r9,0(%r8,%r10) | |
1da177e4 | 342 | sysc_tracego: |
c5328901 MS |
343 | lmg %r3,%r7,__PT_R3(%r11) |
344 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
345 | lg %r2,__PT_ORIG_GPR2(%r11) | |
346 | basr %r14,%r9 # call sys_xxx | |
347 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 | 348 | sysc_tracenogo: |
b6ef5bb3 | 349 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 350 | jz sysc_return |
c5328901 MS |
351 | lgr %r2,%r11 # pass pointer to pt_regs |
352 | larl %r14,sysc_return | |
753c4dd6 | 353 | jg do_syscall_trace_exit |
1da177e4 LT |
354 | |
355 | # | |
356 | # a new process exits the kernel with ret_from_fork | |
357 | # | |
144d634a | 358 | ENTRY(ret_from_fork) |
c5328901 MS |
359 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
360 | lg %r12,__LC_THREAD_INFO | |
37fe5d41 AV |
361 | brasl %r14,schedule_tail |
362 | TRACE_IRQS_ON | |
363 | ssm __LC_SVC_NEW_PSW # reenable interrupts | |
30dcb099 AV |
364 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? |
365 | jne sysc_tracenogo | |
366 | # it's a kernel thread | |
367 | lmg %r9,%r10,__PT_R9(%r11) # load gprs | |
37fe5d41 AV |
368 | ENTRY(kernel_thread_starter) |
369 | la %r2,0(%r10) | |
370 | basr %r14,%r9 | |
30dcb099 | 371 | j sysc_tracenogo |
1da177e4 LT |
372 | |
373 | /* | |
374 | * Program check handler routine | |
375 | */ | |
376 | ||
144d634a | 377 | ENTRY(pgm_check_handler) |
c185b783 | 378 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
379 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
380 | lg %r10,__LC_LAST_BREAK | |
381 | lg %r12,__LC_THREAD_INFO | |
382 | larl %r13,system_call | |
383 | lmg %r8,%r9,__LC_PGM_OLD_PSW | |
ce6a04ac | 384 | HANDLE_SIE_INTERCEPT %r14,1 |
c5328901 MS |
385 | tmhh %r8,0x0001 # test problem state bit |
386 | jnz 1f # -> fault in user space | |
387 | tmhh %r8,0x4000 # PER bit set in old PSW ? | |
388 | jnz 0f # -> enabled, can't be a double fault | |
389 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
390 | jnz pgm_svcper # -> single stepped svc | |
391 | 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC | |
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) | |
c5328901 MS |
401 | 2: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
402 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
403 | stmg %r0,%r7,__PT_R0(%r11) | |
404 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
405 | stmg %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
406 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
407 | mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE | |
c5328901 MS |
408 | stg %r10,__PT_ARGS(%r11) |
409 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
410 | jz 0f | |
c5328901 MS |
411 | tmhh %r8,0x0001 # kernel per event ? |
412 | jz pgm_kprobe | |
413 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
d35339a4 MS |
414 | mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS |
415 | mvc __THREAD_per_cause(2,%r14),__LC_PER_CAUSE | |
416 | mvc __THREAD_per_paid(1,%r14),__LC_PER_PAID | |
aa33c8cb | 417 | 0: REENABLE_IRQS |
c5328901 | 418 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f5cdac27 | 419 | larl %r1,pgm_check_table |
aa33c8cb MS |
420 | llgh %r10,__PT_INT_CODE+2(%r11) |
421 | nill %r10,0x007f | |
b01a37a7 | 422 | sll %r10,2 |
aa33c8cb | 423 | je sysc_return |
b01a37a7 | 424 | lgf %r1,0(%r10,%r1) # load address of handler routine |
c5328901 | 425 | lgr %r2,%r11 # pass pointer to pt_regs |
f5cdac27 | 426 | basr %r14,%r1 # branch to interrupt-handler |
f5cdac27 | 427 | j sysc_return |
1da177e4 LT |
428 | |
429 | # | |
c5328901 | 430 | # PER event in supervisor state, must be kprobes |
1da177e4 | 431 | # |
c5328901 MS |
432 | pgm_kprobe: |
433 | REENABLE_IRQS | |
434 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
435 | lgr %r2,%r11 # pass pointer to pt_regs | |
436 | brasl %r14,do_per_trap | |
437 | j sysc_return | |
1da177e4 | 438 | |
4ba069b8 | 439 | # |
c5328901 | 440 | # single stepped system call |
4ba069b8 | 441 | # |
c5328901 MS |
442 | pgm_svcper: |
443 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
444 | mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW | |
445 | larl %r14,sysc_per | |
446 | stg %r14,__LC_RETURN_PSW+8 | |
447 | lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs | |
4ba069b8 | 448 | |
1da177e4 LT |
449 | /* |
450 | * IO interrupt handler routine | |
451 | */ | |
144d634a | 452 | ENTRY(io_int_handler) |
473e66ba | 453 | STCK __LC_INT_CLOCK |
9cfb9b3c | 454 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
455 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
456 | lg %r10,__LC_LAST_BREAK | |
457 | lg %r12,__LC_THREAD_INFO | |
458 | larl %r13,system_call | |
459 | lmg %r8,%r9,__LC_IO_OLD_PSW | |
ce6a04ac | 460 | HANDLE_SIE_INTERCEPT %r14,0 |
c5328901 MS |
461 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT |
462 | tmhh %r8,0x0001 # interrupting from user? | |
463 | jz io_skip | |
464 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
465 | LAST_BREAK %r14 | |
466 | io_skip: | |
467 | stmg %r0,%r7,__PT_R0(%r11) | |
468 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
469 | stmg %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 470 | TRACE_IRQS_OFF |
c5328901 MS |
471 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
472 | lgr %r2,%r11 # pass pointer to pt_regs | |
473 | brasl %r14,do_IRQ | |
1da177e4 | 474 | io_return: |
6a2df3a8 MS |
475 | LOCKDEP_SYS_EXIT |
476 | TRACE_IRQS_ON | |
477 | io_tif: | |
86f2552b | 478 | tm __TI_flags+7(%r12),_TIF_WORK_INT |
25d83cbf | 479 | jnz io_work # there is work to do (signals etc.) |
411788ea | 480 | io_restore: |
c5328901 MS |
481 | lg %r14,__LC_VDSO_PER_CPU |
482 | lmg %r0,%r10,__PT_R0(%r11) | |
483 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
c5328901 MS |
484 | stpt __LC_EXIT_TIMER |
485 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
486 | lmg %r11,%r15,__PT_R11(%r11) | |
487 | lpswe __LC_RETURN_PSW | |
ae6aa2ea | 488 | io_done: |
1da177e4 | 489 | |
2688905e | 490 | # |
43d399d2 MS |
491 | # There is work todo, find out in which context we have been interrupted: |
492 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
493 | # 2) if we return to kernel code and kvm is enabled check if we need to | |
494 | # modify the psw to leave SIE | |
495 | # 3) if we return to kernel code and preemptive scheduling is enabled check | |
496 | # the preemption counter and if it is zero call preempt_schedule_irq | |
497 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
498 | # |
499 | io_work: | |
c5328901 | 500 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
43d399d2 | 501 | jo io_work_user # yes -> do resched & signal |
43d399d2 | 502 | #ifdef CONFIG_PREEMPT |
2688905e | 503 | # check for preemptive scheduling |
86f2552b | 504 | icm %r0,15,__TI_precount(%r12) |
2688905e | 505 | jnz io_restore # preemption is disabled |
6a2df3a8 MS |
506 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
507 | jno io_restore | |
1da177e4 | 508 | # switch to kernel stack |
c5328901 MS |
509 | lg %r1,__PT_R15(%r11) |
510 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
511 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
512 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
513 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 514 | lgr %r15,%r1 |
6a2df3a8 MS |
515 | # TRACE_IRQS_ON already done at io_return, call |
516 | # TRACE_IRQS_OFF to keep things symmetrical | |
517 | TRACE_IRQS_OFF | |
518 | brasl %r14,preempt_schedule_irq | |
519 | j io_return | |
520 | #else | |
43d399d2 | 521 | j io_restore |
6a2df3a8 | 522 | #endif |
1da177e4 | 523 | |
43d399d2 MS |
524 | # |
525 | # Need to do work before returning to userspace, switch to kernel stack | |
526 | # | |
2688905e | 527 | io_work_user: |
1da177e4 | 528 | lg %r1,__LC_KERNEL_STACK |
c5328901 MS |
529 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
530 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
531 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
532 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 533 | lgr %r15,%r1 |
43d399d2 | 534 | |
1da177e4 LT |
535 | # |
536 | # One of the work bits is on. Find out which one. | |
43d399d2 | 537 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
54dfe5dd | 538 | # and _TIF_MCCK_PENDING |
1da177e4 | 539 | # |
6a2df3a8 | 540 | io_work_tif: |
86f2552b | 541 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 542 | jo io_mcck_pending |
86f2552b | 543 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 544 | jo io_reschedule |
86f2552b | 545 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 546 | jo io_sigpending |
86f2552b | 547 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 MS |
548 | jo io_notify_resume |
549 | j io_return # beware of critical section cleanup | |
0eaeafa1 | 550 | |
77fa2245 HC |
551 | # |
552 | # _TIF_MCCK_PENDING is set, call handler | |
553 | # | |
554 | io_mcck_pending: | |
6a2df3a8 | 555 | # TRACE_IRQS_ON already done at io_return |
b771aeac | 556 | brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler |
6a2df3a8 MS |
557 | TRACE_IRQS_OFF |
558 | j io_return | |
77fa2245 | 559 | |
1da177e4 LT |
560 | # |
561 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
562 | # |
563 | io_reschedule: | |
6a2df3a8 | 564 | # TRACE_IRQS_ON already done at io_return |
c5328901 | 565 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 566 | brasl %r14,schedule # call scheduler |
c5328901 | 567 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 568 | TRACE_IRQS_OFF |
6a2df3a8 | 569 | j io_return |
1da177e4 LT |
570 | |
571 | # | |
02a029b3 | 572 | # _TIF_SIGPENDING or is set, call do_signal |
1da177e4 | 573 | # |
25d83cbf | 574 | io_sigpending: |
6a2df3a8 | 575 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
576 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
577 | lgr %r2,%r11 # pass pointer to pt_regs | |
578 | brasl %r14,do_signal | |
579 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
411788ea | 580 | TRACE_IRQS_OFF |
6a2df3a8 | 581 | j io_return |
1da177e4 | 582 | |
753c4dd6 MS |
583 | # |
584 | # _TIF_NOTIFY_RESUME or is set, call do_notify_resume | |
585 | # | |
586 | io_notify_resume: | |
6a2df3a8 | 587 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
588 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
589 | lgr %r2,%r11 # pass pointer to pt_regs | |
590 | brasl %r14,do_notify_resume | |
591 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 592 | TRACE_IRQS_OFF |
6a2df3a8 | 593 | j io_return |
753c4dd6 | 594 | |
1da177e4 LT |
595 | /* |
596 | * External interrupt handler routine | |
597 | */ | |
144d634a | 598 | ENTRY(ext_int_handler) |
473e66ba | 599 | STCK __LC_INT_CLOCK |
9cfb9b3c | 600 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
601 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
602 | lg %r10,__LC_LAST_BREAK | |
603 | lg %r12,__LC_THREAD_INFO | |
604 | larl %r13,system_call | |
605 | lmg %r8,%r9,__LC_EXT_OLD_PSW | |
ce6a04ac | 606 | HANDLE_SIE_INTERCEPT %r14,0 |
c5328901 MS |
607 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT |
608 | tmhh %r8,0x0001 # interrupting from user ? | |
609 | jz ext_skip | |
610 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
611 | LAST_BREAK %r14 | |
612 | ext_skip: | |
613 | stmg %r0,%r7,__PT_R0(%r11) | |
614 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
615 | stmg %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 616 | TRACE_IRQS_OFF |
0de9db37 | 617 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f6649a7e | 618 | lghi %r1,4096 |
c5328901 | 619 | lgr %r2,%r11 # pass pointer to pt_regs |
7e180bd8 | 620 | llgf %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code |
f6649a7e MS |
621 | llgf %r4,__LC_EXT_PARAMS # get external parameter |
622 | lg %r5,__LC_EXT_PARAMS2-4096(%r1) # get 64 bit external parameter | |
25d83cbf | 623 | brasl %r14,do_extint |
1da177e4 LT |
624 | j io_return |
625 | ||
4c1051e3 MS |
626 | /* |
627 | * Load idle PSW. The second "half" of this function is in cleanup_idle. | |
628 | */ | |
629 | ENTRY(psw_idle) | |
27f6b416 | 630 | stg %r3,__SF_EMPTY(%r15) |
4c1051e3 MS |
631 | larl %r1,psw_idle_lpsw+4 |
632 | stg %r1,__SF_EMPTY+8(%r15) | |
27f6b416 MS |
633 | STCK __CLOCK_IDLE_ENTER(%r2) |
634 | stpt __TIMER_IDLE_ENTER(%r2) | |
4c1051e3 MS |
635 | psw_idle_lpsw: |
636 | lpswe __SF_EMPTY(%r15) | |
637 | br %r14 | |
638 | psw_idle_end: | |
639 | ||
ae6aa2ea MS |
640 | __critical_end: |
641 | ||
1da177e4 LT |
642 | /* |
643 | * Machine check handler routines | |
644 | */ | |
144d634a | 645 | ENTRY(mcck_int_handler) |
473e66ba | 646 | STCK __LC_MCCK_CLOCK |
77fa2245 HC |
647 | la %r1,4095 # revalidate r1 |
648 | spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer | |
25d83cbf | 649 | lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs |
c5328901 MS |
650 | lg %r10,__LC_LAST_BREAK |
651 | lg %r12,__LC_THREAD_INFO | |
86f2552b | 652 | larl %r13,system_call |
c5328901 | 653 | lmg %r8,%r9,__LC_MCK_OLD_PSW |
ce6a04ac | 654 | HANDLE_SIE_INTERCEPT %r14,0 |
25d83cbf | 655 | tm __LC_MCCK_CODE,0x80 # system damage? |
c5328901 MS |
656 | jo mcck_panic # yes -> rest of mcck code invalid |
657 | lghi %r14,__LC_CPU_TIMER_SAVE_AREA | |
658 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
63b12246 | 659 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
c5328901 | 660 | jo 3f |
63b12246 MS |
661 | la %r14,__LC_SYNC_ENTER_TIMER |
662 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
663 | jl 0f | |
664 | la %r14,__LC_ASYNC_ENTER_TIMER | |
665 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 666 | jl 1f |
63b12246 | 667 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
668 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
669 | jl 2f | |
63b12246 | 670 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 671 | 2: spt 0(%r14) |
6377981f | 672 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c5328901 MS |
673 | 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
674 | jno mcck_panic # no -> skip cleanup critical | |
675 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT | |
676 | tm %r8,0x0001 # interrupting from user ? | |
677 | jz mcck_skip | |
678 | UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER | |
679 | LAST_BREAK %r14 | |
680 | mcck_skip: | |
6551fbdf MS |
681 | lghi %r14,__LC_GPREGS_SAVE_AREA+64 |
682 | stmg %r0,%r7,__PT_R0(%r11) | |
683 | mvc __PT_R8(64,%r11),0(%r14) | |
c5328901 MS |
684 | stmg %r8,%r9,__PT_PSW(%r11) |
685 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
686 | lgr %r2,%r11 # pass pointer to pt_regs | |
77fa2245 | 687 | brasl %r14,s390_do_machine_check |
c5328901 | 688 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
77fa2245 HC |
689 | jno mcck_return |
690 | lg %r1,__LC_KERNEL_STACK # switch to kernel stack | |
c5328901 MS |
691 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
692 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
693 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
694 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
77fa2245 | 695 | lgr %r15,%r1 |
c5328901 | 696 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
86f2552b | 697 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 698 | jno mcck_return |
1f194a4c | 699 | TRACE_IRQS_OFF |
77fa2245 | 700 | brasl %r14,s390_handle_mcck |
1f194a4c | 701 | TRACE_IRQS_ON |
1da177e4 | 702 | mcck_return: |
c5328901 MS |
703 | lg %r14,__LC_VDSO_PER_CPU |
704 | lmg %r0,%r10,__PT_R0(%r11) | |
705 | mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW | |
63b12246 MS |
706 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
707 | jno 0f | |
708 | stpt __LC_EXIT_TIMER | |
c5328901 MS |
709 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
710 | 0: lmg %r11,%r15,__PT_R11(%r11) | |
711 | lpswe __LC_RETURN_MCCK_PSW | |
712 | ||
713 | mcck_panic: | |
714 | lg %r14,__LC_PANIC_STACK | |
715 | slgr %r14,%r15 | |
716 | srag %r14,%r14,PAGE_SHIFT | |
717 | jz 0f | |
718 | lg %r15,__LC_PANIC_STACK | |
719 | 0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
720 | j mcck_skip | |
1da177e4 | 721 | |
7dd6b334 MH |
722 | # |
723 | # PSW restart interrupt handler | |
724 | # | |
8b646bd7 | 725 | ENTRY(restart_int_handler) |
c5328901 | 726 | stg %r15,__LC_SAVE_AREA_RESTART |
8b646bd7 | 727 | lg %r15,__LC_RESTART_STACK |
c5328901 | 728 | aghi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 729 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
730 | stmg %r0,%r14,__PT_R0(%r15) |
731 | mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART | |
732 | mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
733 | aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
734 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
735 | lg %r1,__LC_RESTART_FN # load fn, parm & source cpu |
736 | lg %r2,__LC_RESTART_DATA | |
737 | lg %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
738 | ltgr %r3,%r3 # test source cpu address |
739 | jm 1f # negative -> skip source stop | |
eb546195 | 740 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
741 | brc 10,0b # wait for status stored |
742 | 1: basr %r14,%r1 # call function | |
743 | stap __SF_EMPTY(%r15) # store cpu address | |
744 | llgh %r3,__SF_EMPTY(%r15) | |
eb546195 | 745 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
746 | brc 2,2b |
747 | 3: j 3b | |
7dd6b334 | 748 | |
860dba45 MS |
749 | .section .kprobes.text, "ax" |
750 | ||
1da177e4 LT |
751 | #ifdef CONFIG_CHECK_STACK |
752 | /* | |
753 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
754 | * No need to properly save the registers, we are going to panic anyway. | |
755 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
756 | */ | |
757 | stack_overflow: | |
c5328901 MS |
758 | lg %r11,__LC_PANIC_STACK # change to panic stack |
759 | aghi %r11,-__PT_SIZE # create pt_regs | |
760 | stmg %r0,%r7,__PT_R0(%r11) | |
761 | stmg %r8,%r9,__PT_PSW(%r11) | |
762 | mvc __PT_R8(64,%r11),0(%r14) | |
763 | stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 | |
764 | lgr %r15,%r11 | |
765 | aghi %r15,-STACK_FRAME_OVERHEAD | |
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 | |
849 | aghi %r15,-__PT_SIZE | |
850 | stg %r15,24(%r11) # r11 pt_regs pointer | |
851 | # fill pt_regs | |
852 | mvc __PT_R8(64,%r15),__LC_SAVE_AREA_SYNC | |
853 | stmg %r0,%r7,__PT_R0(%r15) | |
854 | mvc __PT_PSW(16,%r15),__LC_SVC_OLD_PSW | |
aa33c8cb | 855 | mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC |
c5328901 MS |
856 | # setup saved register r15 |
857 | aghi %r15,-STACK_FRAME_OVERHEAD | |
858 | stg %r15,56(%r11) # r15 stack pointer | |
859 | # set new psw address and exit | |
860 | larl %r9,sysc_do_svc | |
1da177e4 LT |
861 | br %r14 |
862 | cleanup_system_call_insn: | |
25d83cbf | 863 | .quad system_call |
c5328901 MS |
864 | .quad sysc_stmg |
865 | .quad sysc_per | |
866 | .quad sysc_vtime+18 | |
867 | .quad sysc_vtime+42 | |
1da177e4 | 868 | |
6a2df3a8 | 869 | cleanup_sysc_tif: |
c5328901 | 870 | larl %r9,sysc_tif |
1da177e4 LT |
871 | br %r14 |
872 | ||
6a2df3a8 | 873 | cleanup_sysc_restore: |
c5328901 | 874 | clg %r9,BASED(cleanup_sysc_restore_insn) |
6377981f | 875 | je 0f |
c5328901 MS |
876 | lg %r9,24(%r11) # get saved pointer to pt_regs |
877 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
878 | mvc 0(64,%r11),__PT_R8(%r9) | |
879 | lmg %r0,%r7,__PT_R0(%r9) | |
880 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
1da177e4 | 881 | br %r14 |
6a2df3a8 | 882 | cleanup_sysc_restore_insn: |
411788ea | 883 | .quad sysc_done - 4 |
1da177e4 | 884 | |
6a2df3a8 | 885 | cleanup_io_tif: |
c5328901 | 886 | larl %r9,io_tif |
176b1803 MS |
887 | br %r14 |
888 | ||
6a2df3a8 | 889 | cleanup_io_restore: |
c5328901 MS |
890 | clg %r9,BASED(cleanup_io_restore_insn) |
891 | je 0f | |
892 | lg %r9,24(%r11) # get saved r11 pointer to pt_regs | |
893 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
c5328901 MS |
894 | mvc 0(64,%r11),__PT_R8(%r9) |
895 | lmg %r0,%r7,__PT_R0(%r9) | |
896 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
ae6aa2ea | 897 | br %r14 |
6a2df3a8 | 898 | cleanup_io_restore_insn: |
411788ea | 899 | .quad io_done - 4 |
ae6aa2ea | 900 | |
4c1051e3 MS |
901 | cleanup_idle: |
902 | # copy interrupt clock & cpu timer | |
27f6b416 MS |
903 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK |
904 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER | |
4c1051e3 MS |
905 | cghi %r11,__LC_SAVE_AREA_ASYNC |
906 | je 0f | |
27f6b416 MS |
907 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK |
908 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER | |
4c1051e3 MS |
909 | 0: # check if stck & stpt have been executed |
910 | clg %r9,BASED(cleanup_idle_insn) | |
911 | jhe 1f | |
27f6b416 MS |
912 | mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) |
913 | mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) | |
914 | 1: # account system time going idle | |
4c1051e3 | 915 | lg %r9,__LC_STEAL_TIMER |
27f6b416 | 916 | alg %r9,__CLOCK_IDLE_ENTER(%r2) |
4c1051e3 MS |
917 | slg %r9,__LC_LAST_UPDATE_CLOCK |
918 | stg %r9,__LC_STEAL_TIMER | |
27f6b416 | 919 | mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) |
4c1051e3 MS |
920 | lg %r9,__LC_SYSTEM_TIMER |
921 | alg %r9,__LC_LAST_UPDATE_TIMER | |
27f6b416 | 922 | slg %r9,__TIMER_IDLE_ENTER(%r2) |
4c1051e3 | 923 | stg %r9,__LC_SYSTEM_TIMER |
27f6b416 | 924 | mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) |
4c1051e3 MS |
925 | # prepare return psw |
926 | nihh %r8,0xfffd # clear wait state bit | |
927 | lg %r9,48(%r11) # return from psw_idle | |
928 | br %r14 | |
929 | cleanup_idle_insn: | |
930 | .quad psw_idle_lpsw | |
931 | ||
1da177e4 LT |
932 | /* |
933 | * Integer constants | |
934 | */ | |
c5328901 | 935 | .align 8 |
1da177e4 | 936 | .Lcritical_start: |
c5328901 MS |
937 | .quad __critical_start |
938 | .Lcritical_length: | |
939 | .quad __critical_end - __critical_start | |
940 | ||
1da177e4 | 941 | |
603d1a50 MS |
942 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
943 | /* | |
944 | * sie64a calling convention: | |
945 | * %r2 pointer to sie control block | |
946 | * %r3 guest register save area | |
947 | */ | |
144d634a | 948 | ENTRY(sie64a) |
603d1a50 MS |
949 | stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers |
950 | stg %r2,__SF_EMPTY(%r15) # save control block pointer | |
951 | stg %r3,__SF_EMPTY+8(%r15) # save guest register save area | |
ddd6f953 | 952 | xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # host id == 0 |
603d1a50 | 953 | lmg %r0,%r13,0(%r3) # load guest gprs 0-13 |
ce6a04ac CB |
954 | # some program checks are suppressing. C code (e.g. do_protection_exception) |
955 | # will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other | |
956 | # instructions in the sie_loop should not cause program interrupts. So | |
957 | # lets use a nop (47 00 00 00) as a landing pad. | |
958 | # See also HANDLE_SIE_INTERCEPT | |
959 | rewind_pad: | |
960 | nop 0 | |
603d1a50 MS |
961 | sie_loop: |
962 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct | |
963 | tm __TI_flags+7(%r14),_TIF_EXIT_SIE | |
964 | jnz sie_exit | |
480e5926 CB |
965 | lg %r14,__LC_GMAP # get gmap pointer |
966 | ltgr %r14,%r14 | |
967 | jz sie_gmap | |
968 | lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce | |
969 | sie_gmap: | |
603d1a50 | 970 | lg %r14,__SF_EMPTY(%r15) # get control block pointer |
23d18e8d | 971 | LPP __SF_EMPTY(%r15) # set guest id |
603d1a50 MS |
972 | sie 0(%r14) |
973 | sie_done: | |
23d18e8d | 974 | LPP __SF_EMPTY+16(%r15) # set host id |
603d1a50 MS |
975 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
976 | sie_exit: | |
480e5926 | 977 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
603d1a50 MS |
978 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
979 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
980 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
981 | lghi %r2,0 | |
982 | br %r14 | |
983 | sie_fault: | |
69ba9743 | 984 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
603d1a50 | 985 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
603d1a50 MS |
986 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
987 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
988 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
989 | lghi %r2,-EFAULT | |
990 | br %r14 | |
991 | ||
992 | .align 8 | |
993 | .Lsie_loop: | |
994 | .quad sie_loop | |
c5328901 MS |
995 | .Lsie_length: |
996 | .quad sie_done - sie_loop | |
ddd6f953 MS |
997 | .Lhost_id: |
998 | .quad 0 | |
603d1a50 | 999 | |
ce6a04ac | 1000 | EX_TABLE(rewind_pad,sie_fault) |
eb608fb3 | 1001 | EX_TABLE(sie_loop,sie_fault) |
603d1a50 MS |
1002 | #endif |
1003 | ||
25d83cbf | 1004 | .section .rodata, "a" |
1da177e4 | 1005 | #define SYSCALL(esa,esame,emu) .long esame |
9bf1226b | 1006 | .globl sys_call_table |
1da177e4 LT |
1007 | sys_call_table: |
1008 | #include "syscalls.S" | |
1009 | #undef SYSCALL | |
1010 | ||
347a8dc3 | 1011 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
1012 | |
1013 | #define SYSCALL(esa,esame,emu) .long emu | |
1da177e4 LT |
1014 | sys_call_table_emu: |
1015 | #include "syscalls.S" | |
1016 | #undef SYSCALL | |
1017 | #endif |