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 + 4 | |
24 | __PT_R2 = __PT_GPRS + 8 | |
25 | __PT_R3 = __PT_GPRS + 12 | |
26 | __PT_R4 = __PT_GPRS + 16 | |
27 | __PT_R5 = __PT_GPRS + 20 | |
28 | __PT_R6 = __PT_GPRS + 24 | |
29 | __PT_R7 = __PT_GPRS + 28 | |
30 | __PT_R8 = __PT_GPRS + 32 | |
31 | __PT_R9 = __PT_GPRS + 36 | |
32 | __PT_R10 = __PT_GPRS + 40 | |
33 | __PT_R11 = __PT_GPRS + 44 | |
34 | __PT_R12 = __PT_GPRS + 48 | |
35 | __PT_R13 = __PT_GPRS + 524 | |
36 | __PT_R14 = __PT_GPRS + 56 | |
37 | __PT_R15 = __PT_GPRS + 60 | |
1da177e4 | 38 | |
753c4dd6 | 39 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
b6ef5bb3 | 40 | _TIF_MCCK_PENDING | _TIF_PER_TRAP ) |
753c4dd6 | 41 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 42 | _TIF_MCCK_PENDING) |
b6ef5bb3 MS |
43 | _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
44 | _TIF_SYSCALL_TRACEPOINT) | |
1da177e4 LT |
45 | |
46 | STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER | |
47 | STACK_SIZE = 1 << STACK_SHIFT | |
dc7ee00d | 48 | STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE |
1da177e4 LT |
49 | |
50 | #define BASED(name) name-system_call(%r13) | |
51 | ||
1f194a4c | 52 | .macro TRACE_IRQS_ON |
c5328901 | 53 | #ifdef CONFIG_TRACE_IRQFLAGS |
50bec4ce | 54 | basr %r2,%r0 |
c5328901 MS |
55 | l %r1,BASED(.Lhardirqs_on) |
56 | basr %r14,%r1 # call trace_hardirqs_on_caller | |
57 | #endif | |
1f194a4c HC |
58 | .endm |
59 | ||
60 | .macro TRACE_IRQS_OFF | |
c5328901 | 61 | #ifdef CONFIG_TRACE_IRQFLAGS |
50bec4ce | 62 | basr %r2,%r0 |
c5328901 MS |
63 | l %r1,BASED(.Lhardirqs_off) |
64 | basr %r14,%r1 # call 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 | l %r1,BASED(.Llockdep_sys_exit) |
c5328901 | 73 | basr %r14,%r1 # call lockdep_sys_exit |
1f194a4c | 74 | #endif |
987ad70a MS |
75 | .endm |
76 | ||
c5328901 | 77 | .macro CHECK_STACK stacksize,savearea |
63b12246 | 78 | #ifdef CONFIG_CHECK_STACK |
c5328901 MS |
79 | tml %r15,\stacksize - CONFIG_STACK_GUARD |
80 | la %r14,\savearea | |
81 | jz stack_overflow | |
63b12246 | 82 | #endif |
63b12246 MS |
83 | .endm |
84 | ||
c5328901 MS |
85 | .macro SWITCH_ASYNC savearea,stack,shift |
86 | tmh %r8,0x0001 # interrupting from user ? | |
87 | jnz 1f | |
88 | lr %r14,%r9 | |
89 | sl %r14,BASED(.Lcritical_start) | |
90 | cl %r14,BASED(.Lcritical_length) | |
91 | jhe 0f | |
92 | la %r11,\savearea # inside critical section, do cleanup | |
93 | bras %r14,cleanup_critical | |
94 | tmh %r8,0x0001 # retest problem state after cleanup | |
95 | jnz 1f | |
96 | 0: l %r14,\stack # are we already on the target stack? | |
1da177e4 | 97 | slr %r14,%r15 |
c5328901 MS |
98 | sra %r14,\shift |
99 | jnz 1f | |
100 | CHECK_STACK 1<<\shift,\savearea | |
dc7ee00d | 101 | ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
c5328901 MS |
102 | j 2f |
103 | 1: l %r15,\stack # load target stack | |
dc7ee00d | 104 | 2: la %r11,STACK_FRAME_OVERHEAD(%r15) |
77fa2245 HC |
105 | .endm |
106 | ||
c5328901 MS |
107 | .macro ADD64 high,low,timer |
108 | al \high,\timer | |
4c1051e3 | 109 | al \low,4+\timer |
c5328901 MS |
110 | brc 12,.+8 |
111 | ahi \high,1 | |
1da177e4 LT |
112 | .endm |
113 | ||
c5328901 MS |
114 | .macro SUB64 high,low,timer |
115 | sl \high,\timer | |
4c1051e3 | 116 | sl \low,4+\timer |
c5328901 MS |
117 | brc 3,.+8 |
118 | ahi \high,-1 | |
119 | .endm | |
120 | ||
121 | .macro UPDATE_VTIME high,low,enter_timer | |
122 | lm \high,\low,__LC_EXIT_TIMER | |
123 | SUB64 \high,\low,\enter_timer | |
124 | ADD64 \high,\low,__LC_USER_TIMER | |
125 | stm \high,\low,__LC_USER_TIMER | |
126 | lm \high,\low,__LC_LAST_UPDATE_TIMER | |
127 | SUB64 \high,\low,__LC_EXIT_TIMER | |
128 | ADD64 \high,\low,__LC_SYSTEM_TIMER | |
129 | stm \high,\low,__LC_SYSTEM_TIMER | |
130 | mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer | |
1da177e4 LT |
131 | .endm |
132 | ||
1e54622e | 133 | .macro REENABLE_IRQS |
c5328901 MS |
134 | st %r8,__LC_RETURN_PSW |
135 | ni __LC_RETURN_PSW,0xbf | |
136 | ssm __LC_RETURN_PSW | |
1e54622e MS |
137 | .endm |
138 | ||
860dba45 MS |
139 | .section .kprobes.text, "ax" |
140 | ||
1da177e4 LT |
141 | /* |
142 | * Scheduler resume function, called by switch_to | |
143 | * gpr2 = (task_struct *) prev | |
144 | * gpr3 = (task_struct *) next | |
145 | * Returns: | |
146 | * gpr2 = prev | |
147 | */ | |
144d634a | 148 | ENTRY(__switch_to) |
eda0c6d6 MS |
149 | stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
150 | st %r15,__THREAD_ksp(%r2) # store kernel stack of prev | |
c5328901 | 151 | l %r4,__THREAD_info(%r2) # get thread_info of prev |
5e9a2692 | 152 | l %r5,__THREAD_info(%r3) # get thread_info of next |
eda0c6d6 | 153 | lr %r15,%r5 |
dc7ee00d | 154 | ahi %r15,STACK_INIT # end of kernel stack of next |
eda0c6d6 MS |
155 | st %r3,__LC_CURRENT # store task struct of next |
156 | st %r5,__LC_THREAD_INFO # store thread info of next | |
157 | st %r15,__LC_KERNEL_STACK # store end of kernel stack | |
158 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
159 | mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next | |
160 | l %r15,__THREAD_ksp(%r3) # load kernel stack of next | |
77fa2245 | 161 | tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? |
c5328901 | 162 | jz 0f |
5e9a2692 MS |
163 | ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev |
164 | oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next | |
eda0c6d6 | 165 | 0: lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
1da177e4 LT |
166 | br %r14 |
167 | ||
168 | __critical_start: | |
169 | /* | |
170 | * SVC interrupt handler routine. System calls are synchronous events and | |
171 | * are executed with interrupts enabled. | |
172 | */ | |
173 | ||
144d634a | 174 | ENTRY(system_call) |
c185b783 | 175 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
176 | sysc_stm: |
177 | stm %r8,%r15,__LC_SAVE_AREA_SYNC | |
178 | l %r12,__LC_THREAD_INFO | |
179 | l %r13,__LC_SVC_NEW_PSW+4 | |
180 | sysc_per: | |
181 | l %r15,__LC_KERNEL_STACK | |
c5328901 | 182 | la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs |
1da177e4 | 183 | sysc_vtime: |
c5328901 MS |
184 | UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER |
185 | stm %r0,%r7,__PT_R0(%r11) | |
186 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC | |
187 | mvc __PT_PSW(8,%r11),__LC_SVC_OLD_PSW | |
aa33c8cb | 188 | mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
1da177e4 | 189 | sysc_do_svc: |
c5328901 | 190 | oi __TI_flags+3(%r12),_TIF_SYSCALL |
aa33c8cb | 191 | lh %r8,__PT_INT_CODE+2(%r11) |
c5328901 MS |
192 | sla %r8,2 # shift and test for svc0 |
193 | jnz sysc_nr_ok | |
1da177e4 LT |
194 | # svc 0: system call number in %r1 |
195 | cl %r1,BASED(.Lnr_syscalls) | |
c5328901 | 196 | jnl sysc_nr_ok |
aa33c8cb | 197 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 MS |
198 | lr %r8,%r1 |
199 | sla %r8,2 | |
1da177e4 | 200 | sysc_nr_ok: |
c5328901 MS |
201 | l %r10,BASED(.Lsys_call_table) # 31 bit system call table |
202 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
203 | st %r2,__PT_ORIG_GPR2(%r11) | |
204 | st %r7,STACK_FRAME_OVERHEAD(%r15) | |
205 | l %r9,0(%r8,%r10) # get system call addr. | |
b6ef5bb3 | 206 | tm __TI_flags+2(%r12),_TIF_TRACE >> 8 |
c5328901 MS |
207 | jnz sysc_tracesys |
208 | basr %r14,%r9 # call sys_xxxx | |
209 | st %r2,__PT_R2(%r11) # store return value | |
1da177e4 LT |
210 | |
211 | sysc_return: | |
6a2df3a8 MS |
212 | LOCKDEP_SYS_EXIT |
213 | sysc_tif: | |
c5328901 MS |
214 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
215 | jno sysc_restore | |
1de3447a | 216 | tm __TI_flags+3(%r12),_TIF_WORK_SVC |
c5328901 | 217 | jnz sysc_work # check for work |
b6ef5bb3 | 218 | ni __TI_flags+3(%r12),255-_TIF_SYSCALL |
411788ea | 219 | sysc_restore: |
c5328901 MS |
220 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) |
221 | stpt __LC_EXIT_TIMER | |
222 | lm %r0,%r15,__PT_R0(%r11) | |
223 | lpsw __LC_RETURN_PSW | |
411788ea HC |
224 | sysc_done: |
225 | ||
43d399d2 MS |
226 | # |
227 | # One of the work bits is on. Find out which one. | |
228 | # | |
b6ef5bb3 | 229 | sysc_work: |
1de3447a | 230 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
c5328901 | 231 | jo sysc_mcck_pending |
1de3447a | 232 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
c5328901 | 233 | jo sysc_reschedule |
39efd4ec MS |
234 | tm __TI_flags+3(%r12),_TIF_PER_TRAP |
235 | jo sysc_singlestep | |
1de3447a | 236 | tm __TI_flags+3(%r12),_TIF_SIGPENDING |
c5328901 | 237 | jo sysc_sigpending |
1de3447a | 238 | tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME |
c5328901 | 239 | jo sysc_notify_resume |
c5328901 | 240 | j sysc_return # beware of critical section cleanup |
1da177e4 LT |
241 | |
242 | # | |
243 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
244 | # |
245 | sysc_reschedule: | |
246 | l %r1,BASED(.Lschedule) | |
6a2df3a8 | 247 | la %r14,BASED(sysc_return) |
c5328901 | 248 | br %r1 # call schedule |
1da177e4 | 249 | |
77fa2245 HC |
250 | # |
251 | # _TIF_MCCK_PENDING is set, call handler | |
252 | # | |
253 | sysc_mcck_pending: | |
c5328901 | 254 | l %r1,BASED(.Lhandle_mcck) |
6a2df3a8 | 255 | la %r14,BASED(sysc_return) |
77fa2245 HC |
256 | br %r1 # TIF bit will be cleared by handler |
257 | ||
1da177e4 | 258 | # |
02a029b3 | 259 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 260 | # |
25d83cbf | 261 | sysc_sigpending: |
c5328901 | 262 | lr %r2,%r11 # pass pointer to pt_regs |
25d83cbf HC |
263 | l %r1,BASED(.Ldo_signal) |
264 | basr %r14,%r1 # call do_signal | |
b6ef5bb3 | 265 | tm __TI_flags+3(%r12),_TIF_SYSCALL |
c5328901 MS |
266 | jno sysc_return |
267 | lm %r2,%r7,__PT_R2(%r11) # load svc arguments | |
268 | xr %r8,%r8 # svc 0 returns -ENOSYS | |
aa33c8cb | 269 | clc __PT_INT_CODE+2(2,%r11),BASED(.Lnr_syscalls+2) |
c5328901 | 270 | jnl sysc_nr_ok # invalid svc number -> do svc 0 |
aa33c8cb | 271 | lh %r8,__PT_INT_CODE+2(%r11) # load new svc number |
c5328901 MS |
272 | sla %r8,2 |
273 | j sysc_nr_ok # restart svc | |
1da177e4 | 274 | |
753c4dd6 MS |
275 | # |
276 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
277 | # | |
278 | sysc_notify_resume: | |
c5328901 | 279 | lr %r2,%r11 # pass pointer to pt_regs |
753c4dd6 | 280 | l %r1,BASED(.Ldo_notify_resume) |
6a2df3a8 | 281 | la %r14,BASED(sysc_return) |
753c4dd6 MS |
282 | br %r1 # call do_notify_resume |
283 | ||
1da177e4 | 284 | # |
5e9a2692 | 285 | # _TIF_PER_TRAP is set, call do_per_trap |
1da177e4 LT |
286 | # |
287 | sysc_singlestep: | |
39efd4ec | 288 | ni __TI_flags+3(%r12),255-_TIF_PER_TRAP |
c5328901 MS |
289 | lr %r2,%r11 # pass pointer to pt_regs |
290 | l %r1,BASED(.Ldo_per_trap) | |
291 | la %r14,BASED(sysc_return) | |
292 | br %r1 # call do_per_trap | |
1da177e4 | 293 | |
1da177e4 | 294 | # |
753c4dd6 MS |
295 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
296 | # and after the system call | |
1da177e4 LT |
297 | # |
298 | sysc_tracesys: | |
c5328901 MS |
299 | l %r1,BASED(.Ltrace_enter) |
300 | lr %r2,%r11 # pass pointer to pt_regs | |
1da177e4 | 301 | la %r3,0 |
1de3447a | 302 | xr %r0,%r0 |
aa33c8cb | 303 | icm %r0,3,__PT_INT_CODE+2(%r11) |
c5328901 MS |
304 | st %r0,__PT_R2(%r11) |
305 | basr %r14,%r1 # call do_syscall_trace_enter | |
753c4dd6 | 306 | cl %r2,BASED(.Lnr_syscalls) |
c5328901 MS |
307 | jnl sysc_tracenogo |
308 | lr %r8,%r2 | |
309 | sll %r8,2 | |
310 | l %r9,0(%r8,%r10) | |
1da177e4 | 311 | sysc_tracego: |
c5328901 MS |
312 | lm %r3,%r7,__PT_R3(%r11) |
313 | st %r7,STACK_FRAME_OVERHEAD(%r15) | |
314 | l %r2,__PT_ORIG_GPR2(%r11) | |
315 | basr %r14,%r9 # call sys_xxx | |
316 | st %r2,__PT_R2(%r11) # store return value | |
1da177e4 | 317 | sysc_tracenogo: |
b6ef5bb3 | 318 | tm __TI_flags+2(%r12),_TIF_TRACE >> 8 |
c5328901 | 319 | jz sysc_return |
753c4dd6 | 320 | l %r1,BASED(.Ltrace_exit) |
c5328901 | 321 | lr %r2,%r11 # pass pointer to pt_regs |
1da177e4 | 322 | la %r14,BASED(sysc_return) |
c5328901 | 323 | br %r1 # call do_syscall_trace_exit |
1da177e4 LT |
324 | |
325 | # | |
326 | # a new process exits the kernel with ret_from_fork | |
327 | # | |
144d634a | 328 | ENTRY(ret_from_fork) |
c5328901 MS |
329 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
330 | l %r12,__LC_THREAD_INFO | |
1da177e4 | 331 | l %r13,__LC_SVC_NEW_PSW+4 |
37fe5d41 AV |
332 | l %r1,BASED(.Lschedule_tail) |
333 | basr %r14,%r1 # call schedule_tail | |
334 | TRACE_IRQS_ON | |
335 | ssm __LC_SVC_NEW_PSW # reenable interrupts | |
30dcb099 AV |
336 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? |
337 | jne sysc_tracenogo | |
338 | # it's a kernel thread | |
339 | lm %r9,%r10,__PT_R9(%r11) # load gprs | |
37fe5d41 AV |
340 | ENTRY(kernel_thread_starter) |
341 | la %r2,0(%r10) | |
342 | basr %r14,%r9 | |
30dcb099 | 343 | j sysc_tracenogo |
1da177e4 LT |
344 | |
345 | /* | |
346 | * Program check handler routine | |
347 | */ | |
348 | ||
144d634a | 349 | ENTRY(pgm_check_handler) |
c185b783 | 350 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
351 | stm %r8,%r15,__LC_SAVE_AREA_SYNC |
352 | l %r12,__LC_THREAD_INFO | |
353 | l %r13,__LC_SVC_NEW_PSW+4 | |
354 | lm %r8,%r9,__LC_PGM_OLD_PSW | |
355 | tmh %r8,0x0001 # test problem state bit | |
356 | jnz 1f # -> fault in user space | |
357 | tmh %r8,0x4000 # PER bit set in old PSW ? | |
358 | jnz 0f # -> enabled, can't be a double fault | |
359 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
360 | jnz pgm_svcper # -> single stepped svc | |
361 | 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC | |
dc7ee00d | 362 | ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
c5328901 MS |
363 | j 2f |
364 | 1: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER | |
365 | l %r15,__LC_KERNEL_STACK | |
dc7ee00d | 366 | 2: la %r11,STACK_FRAME_OVERHEAD(%r15) |
c5328901 MS |
367 | stm %r0,%r7,__PT_R0(%r11) |
368 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC | |
369 | stm %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
370 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
371 | mvc __PT_INT_PARM_LONG(4,%r11),__LC_TRANS_EXC_CODE | |
c5328901 MS |
372 | tm __LC_PGM_ILC+3,0x80 # check for per exception |
373 | jz 0f | |
1de3447a | 374 | l %r1,__TI_task(%r12) |
c5328901 MS |
375 | tmh %r8,0x0001 # kernel per event ? |
376 | jz pgm_kprobe | |
377 | oi __TI_flags+3(%r12),_TIF_PER_TRAP | |
5e9a2692 | 378 | mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS |
c5328901 | 379 | mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE |
5e9a2692 | 380 | mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID |
aa33c8cb | 381 | 0: REENABLE_IRQS |
c5328901 | 382 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) |
1de3447a | 383 | l %r1,BASED(.Ljump_table) |
c5328901 | 384 | la %r10,0x7f |
aa33c8cb | 385 | n %r10,__PT_INT_CODE(%r11) |
c5328901 MS |
386 | je sysc_return |
387 | sll %r10,2 | |
388 | l %r1,0(%r10,%r1) # load address of handler routine | |
389 | lr %r2,%r11 # pass pointer to pt_regs | |
1de3447a | 390 | basr %r14,%r1 # branch to interrupt-handler |
c5328901 | 391 | j sysc_return |
1da177e4 LT |
392 | |
393 | # | |
c5328901 | 394 | # PER event in supervisor state, must be kprobes |
1da177e4 | 395 | # |
c5328901 MS |
396 | pgm_kprobe: |
397 | REENABLE_IRQS | |
398 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
399 | l %r1,BASED(.Ldo_per_trap) | |
400 | lr %r2,%r11 # pass pointer to pt_regs | |
401 | basr %r14,%r1 # call do_per_trap | |
402 | j sysc_return | |
1da177e4 | 403 | |
4ba069b8 | 404 | # |
c5328901 | 405 | # single stepped system call |
4ba069b8 | 406 | # |
c5328901 MS |
407 | pgm_svcper: |
408 | oi __TI_flags+3(%r12),_TIF_PER_TRAP | |
409 | mvc __LC_RETURN_PSW(4),__LC_SVC_NEW_PSW | |
410 | mvc __LC_RETURN_PSW+4(4),BASED(.Lsysc_per) | |
411 | lpsw __LC_RETURN_PSW # branch to sysc_per and enable irqs | |
4ba069b8 | 412 | |
1da177e4 LT |
413 | /* |
414 | * IO interrupt handler routine | |
415 | */ | |
416 | ||
144d634a | 417 | ENTRY(io_int_handler) |
1da177e4 | 418 | stck __LC_INT_CLOCK |
9cfb9b3c | 419 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
420 | stm %r8,%r15,__LC_SAVE_AREA_ASYNC |
421 | l %r12,__LC_THREAD_INFO | |
422 | l %r13,__LC_SVC_NEW_PSW+4 | |
423 | lm %r8,%r9,__LC_IO_OLD_PSW | |
424 | tmh %r8,0x0001 # interrupting from user ? | |
425 | jz io_skip | |
426 | UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER | |
427 | io_skip: | |
428 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
429 | stm %r0,%r7,__PT_R0(%r11) | |
430 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC | |
431 | stm %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 432 | TRACE_IRQS_OFF |
c5328901 MS |
433 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) |
434 | l %r1,BASED(.Ldo_IRQ) | |
435 | lr %r2,%r11 # pass pointer to pt_regs | |
436 | basr %r14,%r1 # call do_IRQ | |
1da177e4 | 437 | io_return: |
6a2df3a8 MS |
438 | LOCKDEP_SYS_EXIT |
439 | TRACE_IRQS_ON | |
440 | io_tif: | |
1de3447a | 441 | tm __TI_flags+3(%r12),_TIF_WORK_INT |
c5328901 | 442 | jnz io_work # there is work to do (signals etc.) |
411788ea | 443 | io_restore: |
c5328901 | 444 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) |
c5328901 MS |
445 | stpt __LC_EXIT_TIMER |
446 | lm %r0,%r15,__PT_R0(%r11) | |
447 | lpsw __LC_RETURN_PSW | |
ae6aa2ea | 448 | io_done: |
1da177e4 | 449 | |
2688905e | 450 | # |
43d399d2 MS |
451 | # There is work todo, find out in which context we have been interrupted: |
452 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
453 | # 2) if we return to kernel code and preemptive scheduling is enabled check | |
454 | # the preemption counter and if it is zero call preempt_schedule_irq | |
455 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
456 | # |
457 | io_work: | |
c5328901 MS |
458 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
459 | jo io_work_user # yes -> do resched & signal | |
43d399d2 | 460 | #ifdef CONFIG_PREEMPT |
2688905e | 461 | # check for preemptive scheduling |
1de3447a | 462 | icm %r0,15,__TI_precount(%r12) |
c5328901 | 463 | jnz io_restore # preemption disabled |
1de3447a | 464 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
c5328901 | 465 | jno io_restore |
43d399d2 | 466 | # switch to kernel stack |
c5328901 MS |
467 | l %r1,__PT_R15(%r11) |
468 | ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
469 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
470 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) | |
471 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 472 | lr %r15,%r1 |
6a2df3a8 MS |
473 | # TRACE_IRQS_ON already done at io_return, call |
474 | # TRACE_IRQS_OFF to keep things symmetrical | |
475 | TRACE_IRQS_OFF | |
c5328901 | 476 | l %r1,BASED(.Lpreempt_irq) |
6a2df3a8 | 477 | basr %r14,%r1 # call preempt_schedule_irq |
c5328901 | 478 | j io_return |
6a2df3a8 | 479 | #else |
c5328901 | 480 | j io_restore |
6a2df3a8 | 481 | #endif |
1da177e4 | 482 | |
43d399d2 MS |
483 | # |
484 | # Need to do work before returning to userspace, switch to kernel stack | |
485 | # | |
2688905e | 486 | io_work_user: |
1da177e4 | 487 | l %r1,__LC_KERNEL_STACK |
c5328901 MS |
488 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
489 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) | |
490 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 491 | lr %r15,%r1 |
6a2df3a8 | 492 | |
1da177e4 LT |
493 | # |
494 | # One of the work bits is on. Find out which one. | |
43d399d2 | 495 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
25d83cbf | 496 | # and _TIF_MCCK_PENDING |
1da177e4 | 497 | # |
6a2df3a8 | 498 | io_work_tif: |
1de3447a | 499 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
c5328901 | 500 | jo io_mcck_pending |
1de3447a | 501 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
c5328901 | 502 | jo io_reschedule |
1de3447a | 503 | tm __TI_flags+3(%r12),_TIF_SIGPENDING |
c5328901 | 504 | jo io_sigpending |
1de3447a | 505 | tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME |
c5328901 MS |
506 | jo io_notify_resume |
507 | j io_return # beware of critical section cleanup | |
1da177e4 | 508 | |
77fa2245 HC |
509 | # |
510 | # _TIF_MCCK_PENDING is set, call handler | |
511 | # | |
512 | io_mcck_pending: | |
6a2df3a8 | 513 | # TRACE_IRQS_ON already done at io_return |
c5328901 | 514 | l %r1,BASED(.Lhandle_mcck) |
b771aeac | 515 | basr %r14,%r1 # TIF bit will be cleared by handler |
6a2df3a8 | 516 | TRACE_IRQS_OFF |
c5328901 | 517 | j io_return |
77fa2245 | 518 | |
1da177e4 LT |
519 | # |
520 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
521 | # |
522 | io_reschedule: | |
6a2df3a8 | 523 | # TRACE_IRQS_ON already done at io_return |
25d83cbf | 524 | l %r1,BASED(.Lschedule) |
c5328901 | 525 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 526 | basr %r14,%r1 # call scheduler |
c5328901 | 527 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 528 | TRACE_IRQS_OFF |
c5328901 | 529 | j io_return |
1da177e4 LT |
530 | |
531 | # | |
02a029b3 | 532 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 533 | # |
25d83cbf | 534 | io_sigpending: |
6a2df3a8 | 535 | # TRACE_IRQS_ON already done at io_return |
25d83cbf | 536 | l %r1,BASED(.Ldo_signal) |
c5328901 MS |
537 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
538 | lr %r2,%r11 # pass pointer to pt_regs | |
25d83cbf | 539 | basr %r14,%r1 # call do_signal |
c5328901 | 540 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 541 | TRACE_IRQS_OFF |
c5328901 | 542 | j io_return |
1da177e4 | 543 | |
753c4dd6 MS |
544 | # |
545 | # _TIF_SIGPENDING is set, call do_signal | |
546 | # | |
547 | io_notify_resume: | |
6a2df3a8 | 548 | # TRACE_IRQS_ON already done at io_return |
753c4dd6 | 549 | l %r1,BASED(.Ldo_notify_resume) |
c5328901 MS |
550 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
551 | lr %r2,%r11 # pass pointer to pt_regs | |
552 | basr %r14,%r1 # call do_notify_resume | |
553 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 554 | TRACE_IRQS_OFF |
c5328901 | 555 | j io_return |
753c4dd6 | 556 | |
1da177e4 LT |
557 | /* |
558 | * External interrupt handler routine | |
559 | */ | |
560 | ||
144d634a | 561 | ENTRY(ext_int_handler) |
1da177e4 | 562 | stck __LC_INT_CLOCK |
9cfb9b3c | 563 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
564 | stm %r8,%r15,__LC_SAVE_AREA_ASYNC |
565 | l %r12,__LC_THREAD_INFO | |
566 | l %r13,__LC_SVC_NEW_PSW+4 | |
567 | lm %r8,%r9,__LC_EXT_OLD_PSW | |
568 | tmh %r8,0x0001 # interrupting from user ? | |
569 | jz ext_skip | |
570 | UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER | |
571 | ext_skip: | |
572 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
573 | stm %r0,%r7,__PT_R0(%r11) | |
574 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC | |
575 | stm %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 576 | TRACE_IRQS_OFF |
c5328901 | 577 | lr %r2,%r11 # pass pointer to pt_regs |
7e180bd8 | 578 | l %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code |
f6649a7e | 579 | l %r4,__LC_EXT_PARAMS # get external parameters |
1da177e4 | 580 | l %r1,BASED(.Ldo_extint) |
c5328901 MS |
581 | basr %r14,%r1 # call do_extint |
582 | j io_return | |
1da177e4 | 583 | |
4c1051e3 MS |
584 | /* |
585 | * Load idle PSW. The second "half" of this function is in cleanup_idle. | |
586 | */ | |
587 | ENTRY(psw_idle) | |
27f6b416 | 588 | st %r3,__SF_EMPTY(%r15) |
4c1051e3 MS |
589 | basr %r1,0 |
590 | la %r1,psw_idle_lpsw+4-.(%r1) | |
591 | st %r1,__SF_EMPTY+4(%r15) | |
592 | oi __SF_EMPTY+4(%r15),0x80 | |
27f6b416 MS |
593 | stck __CLOCK_IDLE_ENTER(%r2) |
594 | stpt __TIMER_IDLE_ENTER(%r2) | |
4c1051e3 MS |
595 | psw_idle_lpsw: |
596 | lpsw __SF_EMPTY(%r15) | |
597 | br %r14 | |
598 | psw_idle_end: | |
599 | ||
ae6aa2ea MS |
600 | __critical_end: |
601 | ||
1da177e4 LT |
602 | /* |
603 | * Machine check handler routines | |
604 | */ | |
605 | ||
144d634a | 606 | ENTRY(mcck_int_handler) |
6377981f | 607 | stck __LC_MCCK_CLOCK |
77fa2245 HC |
608 | spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer |
609 | lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs | |
c5328901 MS |
610 | l %r12,__LC_THREAD_INFO |
611 | l %r13,__LC_SVC_NEW_PSW+4 | |
612 | lm %r8,%r9,__LC_MCK_OLD_PSW | |
25d83cbf | 613 | tm __LC_MCCK_CODE,0x80 # system damage? |
c5328901 MS |
614 | jo mcck_panic # yes -> rest of mcck code invalid |
615 | la %r14,__LC_CPU_TIMER_SAVE_AREA | |
616 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
63b12246 | 617 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
c5328901 | 618 | jo 3f |
63b12246 MS |
619 | la %r14,__LC_SYNC_ENTER_TIMER |
620 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
c5328901 | 621 | jl 0f |
63b12246 MS |
622 | la %r14,__LC_ASYNC_ENTER_TIMER |
623 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 624 | jl 1f |
63b12246 | 625 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
626 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
627 | jl 2f | |
63b12246 | 628 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 629 | 2: spt 0(%r14) |
6377981f | 630 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c5328901 MS |
631 | 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
632 | jno mcck_panic # no -> skip cleanup critical | |
633 | tm %r8,0x0001 # interrupting from user ? | |
634 | jz mcck_skip | |
635 | UPDATE_VTIME %r14,%r15,__LC_MCCK_ENTER_TIMER | |
636 | mcck_skip: | |
637 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+32,__LC_PANIC_STACK,PAGE_SHIFT | |
6551fbdf MS |
638 | stm %r0,%r7,__PT_R0(%r11) |
639 | mvc __PT_R8(32,%r11),__LC_GPREGS_SAVE_AREA+32 | |
c5328901 MS |
640 | stm %r8,%r9,__PT_PSW(%r11) |
641 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
642 | l %r1,BASED(.Ldo_machine_check) | |
643 | lr %r2,%r11 # pass pointer to pt_regs | |
644 | basr %r14,%r1 # call s390_do_machine_check | |
645 | tm __PT_PSW+1(%r11),0x01 # returning to user ? | |
646 | jno mcck_return | |
25d83cbf | 647 | l %r1,__LC_KERNEL_STACK # switch to kernel stack |
c5328901 MS |
648 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
649 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) | |
650 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
77fa2245 | 651 | lr %r15,%r1 |
c5328901 | 652 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
1de3447a | 653 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
c5328901 | 654 | jno mcck_return |
1f194a4c | 655 | TRACE_IRQS_OFF |
c5328901 MS |
656 | l %r1,BASED(.Lhandle_mcck) |
657 | basr %r14,%r1 # call s390_handle_mcck | |
1f194a4c | 658 | TRACE_IRQS_ON |
1da177e4 | 659 | mcck_return: |
c5328901 | 660 | mvc __LC_RETURN_MCCK_PSW(8),__PT_PSW(%r11) # move return PSW |
63b12246 | 661 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
c5328901 MS |
662 | jno 0f |
663 | lm %r0,%r15,__PT_R0(%r11) | |
63b12246 | 664 | stpt __LC_EXIT_TIMER |
c5328901 MS |
665 | lpsw __LC_RETURN_MCCK_PSW |
666 | 0: lm %r0,%r15,__PT_R0(%r11) | |
667 | lpsw __LC_RETURN_MCCK_PSW | |
63b12246 | 668 | |
c5328901 MS |
669 | mcck_panic: |
670 | l %r14,__LC_PANIC_STACK | |
671 | slr %r14,%r15 | |
672 | sra %r14,PAGE_SHIFT | |
673 | jz 0f | |
674 | l %r15,__LC_PANIC_STACK | |
dc7ee00d | 675 | j mcck_skip |
c5328901 MS |
676 | 0: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
677 | j mcck_skip | |
1da177e4 | 678 | |
7dd6b334 MH |
679 | # |
680 | # PSW restart interrupt handler | |
681 | # | |
8b646bd7 | 682 | ENTRY(restart_int_handler) |
c5328901 | 683 | st %r15,__LC_SAVE_AREA_RESTART |
8b646bd7 | 684 | l %r15,__LC_RESTART_STACK |
c5328901 | 685 | ahi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 686 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
687 | stm %r0,%r14,__PT_R0(%r15) |
688 | mvc __PT_R15(4,%r15),__LC_SAVE_AREA_RESTART | |
689 | mvc __PT_PSW(8,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
690 | ahi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
691 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
692 | l %r1,__LC_RESTART_FN # load fn, parm & source cpu |
693 | l %r2,__LC_RESTART_DATA | |
694 | l %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
695 | ltr %r3,%r3 # test source cpu address |
696 | jm 1f # negative -> skip source stop | |
eb546195 | 697 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
698 | brc 10,0b # wait for status stored |
699 | 1: basr %r14,%r1 # call function | |
700 | stap __SF_EMPTY(%r15) # store cpu address | |
701 | lh %r3,__SF_EMPTY(%r15) | |
eb546195 | 702 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
703 | brc 2,2b |
704 | 3: j 3b | |
7dd6b334 | 705 | |
860dba45 MS |
706 | .section .kprobes.text, "ax" |
707 | ||
1da177e4 LT |
708 | #ifdef CONFIG_CHECK_STACK |
709 | /* | |
710 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
711 | * No need to properly save the registers, we are going to panic anyway. | |
712 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
713 | */ | |
714 | stack_overflow: | |
715 | l %r15,__LC_PANIC_STACK # change to panic stack | |
dc7ee00d MS |
716 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
717 | stm %r0,%r7,__PT_R0(%r11) | |
718 | stm %r8,%r9,__PT_PSW(%r11) | |
c5328901 | 719 | mvc __PT_R8(32,%r11),0(%r14) |
c5328901 MS |
720 | l %r1,BASED(1f) |
721 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
722 | lr %r2,%r11 # pass pointer to pt_regs | |
723 | br %r1 # branch to kernel_stack_overflow | |
25d83cbf | 724 | 1: .long kernel_stack_overflow |
1da177e4 LT |
725 | #endif |
726 | ||
c5328901 MS |
727 | cleanup_table: |
728 | .long system_call + 0x80000000 | |
729 | .long sysc_do_svc + 0x80000000 | |
730 | .long sysc_tif + 0x80000000 | |
731 | .long sysc_restore + 0x80000000 | |
732 | .long sysc_done + 0x80000000 | |
733 | .long io_tif + 0x80000000 | |
734 | .long io_restore + 0x80000000 | |
735 | .long io_done + 0x80000000 | |
4c1051e3 MS |
736 | .long psw_idle + 0x80000000 |
737 | .long psw_idle_end + 0x80000000 | |
1da177e4 LT |
738 | |
739 | cleanup_critical: | |
c5328901 MS |
740 | cl %r9,BASED(cleanup_table) # system_call |
741 | jl 0f | |
742 | cl %r9,BASED(cleanup_table+4) # sysc_do_svc | |
743 | jl cleanup_system_call | |
744 | cl %r9,BASED(cleanup_table+8) # sysc_tif | |
745 | jl 0f | |
746 | cl %r9,BASED(cleanup_table+12) # sysc_restore | |
747 | jl cleanup_sysc_tif | |
748 | cl %r9,BASED(cleanup_table+16) # sysc_done | |
749 | jl cleanup_sysc_restore | |
750 | cl %r9,BASED(cleanup_table+20) # io_tif | |
751 | jl 0f | |
752 | cl %r9,BASED(cleanup_table+24) # io_restore | |
753 | jl cleanup_io_tif | |
754 | cl %r9,BASED(cleanup_table+28) # io_done | |
755 | jl cleanup_io_restore | |
4c1051e3 MS |
756 | cl %r9,BASED(cleanup_table+32) # psw_idle |
757 | jl 0f | |
758 | cl %r9,BASED(cleanup_table+36) # psw_idle_end | |
759 | jl cleanup_idle | |
c5328901 | 760 | 0: br %r14 |
1da177e4 LT |
761 | |
762 | cleanup_system_call: | |
c5328901 MS |
763 | # check if stpt has been executed |
764 | cl %r9,BASED(cleanup_system_call_insn) | |
765 | jh 0f | |
1da177e4 | 766 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER |
c5328901 MS |
767 | chi %r11,__LC_SAVE_AREA_ASYNC |
768 | je 0f | |
769 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER | |
770 | 0: # check if stm has been executed | |
771 | cl %r9,BASED(cleanup_system_call_insn+4) | |
772 | jh 0f | |
773 | mvc __LC_SAVE_AREA_SYNC(32),0(%r11) | |
774 | 0: # set up saved registers r12, and r13 | |
775 | st %r12,16(%r11) # r12 thread-info pointer | |
776 | st %r13,20(%r11) # r13 literal-pool pointer | |
777 | # check if the user time calculation has been done | |
778 | cl %r9,BASED(cleanup_system_call_insn+8) | |
779 | jh 0f | |
780 | l %r10,__LC_EXIT_TIMER | |
781 | l %r15,__LC_EXIT_TIMER+4 | |
782 | SUB64 %r10,%r15,__LC_SYNC_ENTER_TIMER | |
783 | ADD64 %r10,%r15,__LC_USER_TIMER | |
784 | st %r10,__LC_USER_TIMER | |
785 | st %r15,__LC_USER_TIMER+4 | |
786 | 0: # check if the system time calculation has been done | |
787 | cl %r9,BASED(cleanup_system_call_insn+12) | |
788 | jh 0f | |
789 | l %r10,__LC_LAST_UPDATE_TIMER | |
790 | l %r15,__LC_LAST_UPDATE_TIMER+4 | |
791 | SUB64 %r10,%r15,__LC_EXIT_TIMER | |
792 | ADD64 %r10,%r15,__LC_SYSTEM_TIMER | |
793 | st %r10,__LC_SYSTEM_TIMER | |
794 | st %r15,__LC_SYSTEM_TIMER+4 | |
795 | 0: # update accounting time stamp | |
1da177e4 | 796 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
c5328901 MS |
797 | # set up saved register 11 |
798 | l %r15,__LC_KERNEL_STACK | |
dc7ee00d MS |
799 | la %r9,STACK_FRAME_OVERHEAD(%r15) |
800 | st %r9,12(%r11) # r11 pt_regs pointer | |
c5328901 | 801 | # fill pt_regs |
dc7ee00d MS |
802 | mvc __PT_R8(32,%r9),__LC_SAVE_AREA_SYNC |
803 | stm %r0,%r7,__PT_R0(%r9) | |
804 | mvc __PT_PSW(8,%r9),__LC_SVC_OLD_PSW | |
805 | mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC | |
c5328901 | 806 | # setup saved register 15 |
c5328901 MS |
807 | st %r15,28(%r11) # r15 stack pointer |
808 | # set new psw address and exit | |
809 | l %r9,BASED(cleanup_table+4) # sysc_do_svc + 0x80000000 | |
1da177e4 LT |
810 | br %r14 |
811 | cleanup_system_call_insn: | |
25d83cbf | 812 | .long system_call + 0x80000000 |
c5328901 MS |
813 | .long sysc_stm + 0x80000000 |
814 | .long sysc_vtime + 0x80000000 + 36 | |
815 | .long sysc_vtime + 0x80000000 + 76 | |
1da177e4 | 816 | |
6a2df3a8 | 817 | cleanup_sysc_tif: |
c5328901 | 818 | l %r9,BASED(cleanup_table+8) # sysc_tif + 0x80000000 |
1da177e4 LT |
819 | br %r14 |
820 | ||
6a2df3a8 | 821 | cleanup_sysc_restore: |
c5328901 MS |
822 | cl %r9,BASED(cleanup_sysc_restore_insn) |
823 | jhe 0f | |
824 | l %r9,12(%r11) # get saved pointer to pt_regs | |
825 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) | |
826 | mvc 0(32,%r11),__PT_R8(%r9) | |
827 | lm %r0,%r7,__PT_R0(%r9) | |
828 | 0: lm %r8,%r9,__LC_RETURN_PSW | |
1da177e4 | 829 | br %r14 |
6a2df3a8 | 830 | cleanup_sysc_restore_insn: |
411788ea | 831 | .long sysc_done - 4 + 0x80000000 |
1da177e4 | 832 | |
6a2df3a8 | 833 | cleanup_io_tif: |
c5328901 | 834 | l %r9,BASED(cleanup_table+20) # io_tif + 0x80000000 |
176b1803 MS |
835 | br %r14 |
836 | ||
6a2df3a8 | 837 | cleanup_io_restore: |
c5328901 MS |
838 | cl %r9,BASED(cleanup_io_restore_insn) |
839 | jhe 0f | |
840 | l %r9,12(%r11) # get saved r11 pointer to pt_regs | |
841 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) | |
c5328901 MS |
842 | mvc 0(32,%r11),__PT_R8(%r9) |
843 | lm %r0,%r7,__PT_R0(%r9) | |
844 | 0: lm %r8,%r9,__LC_RETURN_PSW | |
ae6aa2ea | 845 | br %r14 |
6a2df3a8 | 846 | cleanup_io_restore_insn: |
411788ea | 847 | .long io_done - 4 + 0x80000000 |
ae6aa2ea | 848 | |
4c1051e3 MS |
849 | cleanup_idle: |
850 | # copy interrupt clock & cpu timer | |
27f6b416 MS |
851 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK |
852 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER | |
4c1051e3 MS |
853 | chi %r11,__LC_SAVE_AREA_ASYNC |
854 | je 0f | |
27f6b416 MS |
855 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK |
856 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER | |
4c1051e3 MS |
857 | 0: # check if stck has been executed |
858 | cl %r9,BASED(cleanup_idle_insn) | |
859 | jhe 1f | |
27f6b416 MS |
860 | mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) |
861 | mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r3) | |
862 | 1: # account system time going idle | |
4c1051e3 | 863 | lm %r9,%r10,__LC_STEAL_TIMER |
27f6b416 | 864 | ADD64 %r9,%r10,__CLOCK_IDLE_ENTER(%r2) |
4c1051e3 MS |
865 | SUB64 %r9,%r10,__LC_LAST_UPDATE_CLOCK |
866 | stm %r9,%r10,__LC_STEAL_TIMER | |
27f6b416 | 867 | mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) |
4c1051e3 MS |
868 | lm %r9,%r10,__LC_SYSTEM_TIMER |
869 | ADD64 %r9,%r10,__LC_LAST_UPDATE_TIMER | |
27f6b416 | 870 | SUB64 %r9,%r10,__TIMER_IDLE_ENTER(%r2) |
4c1051e3 | 871 | stm %r9,%r10,__LC_SYSTEM_TIMER |
27f6b416 | 872 | mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) |
4c1051e3 MS |
873 | # prepare return psw |
874 | n %r8,BASED(cleanup_idle_wait) # clear wait state bit | |
875 | l %r9,24(%r11) # return from psw_idle | |
876 | br %r14 | |
877 | cleanup_idle_insn: | |
878 | .long psw_idle_lpsw + 0x80000000 | |
879 | cleanup_idle_wait: | |
880 | .long 0xfffdffff | |
881 | ||
1da177e4 LT |
882 | /* |
883 | * Integer constants | |
884 | */ | |
c5328901 | 885 | .align 4 |
4c1051e3 MS |
886 | .Lnr_syscalls: |
887 | .long NR_syscalls | |
888 | .Lvtimer_max: | |
889 | .quad 0x7fffffffffffffff | |
1da177e4 LT |
890 | |
891 | /* | |
892 | * Symbol constants | |
893 | */ | |
c5328901 MS |
894 | .Ldo_machine_check: .long s390_do_machine_check |
895 | .Lhandle_mcck: .long s390_handle_mcck | |
896 | .Ldo_IRQ: .long do_IRQ | |
897 | .Ldo_extint: .long do_extint | |
898 | .Ldo_signal: .long do_signal | |
899 | .Ldo_notify_resume: .long do_notify_resume | |
900 | .Ldo_per_trap: .long do_per_trap | |
c5328901 MS |
901 | .Ljump_table: .long pgm_check_table |
902 | .Lschedule: .long schedule | |
ab1809b4 | 903 | #ifdef CONFIG_PREEMPT |
c5328901 | 904 | .Lpreempt_irq: .long preempt_schedule_irq |
ab1809b4 | 905 | #endif |
c5328901 MS |
906 | .Ltrace_enter: .long do_syscall_trace_enter |
907 | .Ltrace_exit: .long do_syscall_trace_exit | |
908 | .Lschedule_tail: .long schedule_tail | |
909 | .Lsys_call_table: .long sys_call_table | |
910 | .Lsysc_per: .long sysc_per + 0x80000000 | |
1f194a4c | 911 | #ifdef CONFIG_TRACE_IRQFLAGS |
c5328901 MS |
912 | .Lhardirqs_on: .long trace_hardirqs_on_caller |
913 | .Lhardirqs_off: .long trace_hardirqs_off_caller | |
af4c6874 HC |
914 | #endif |
915 | #ifdef CONFIG_LOCKDEP | |
c5328901 | 916 | .Llockdep_sys_exit: .long lockdep_sys_exit |
1f194a4c | 917 | #endif |
c5328901 MS |
918 | .Lcritical_start: .long __critical_start + 0x80000000 |
919 | .Lcritical_length: .long __critical_end - __critical_start | |
1da177e4 | 920 | |
25d83cbf | 921 | .section .rodata, "a" |
1da177e4 | 922 | #define SYSCALL(esa,esame,emu) .long esa |
9bf1226b | 923 | .globl sys_call_table |
1da177e4 LT |
924 | sys_call_table: |
925 | #include "syscalls.S" | |
926 | #undef SYSCALL |