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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * S390 low-level entry points. |
3 | * | |
a53c8fab | 4 | * Copyright IBM Corp. 1999, 2012 |
1da177e4 | 5 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
25d83cbf HC |
6 | * Hartmut Penner (hp@de.ibm.com), |
7 | * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), | |
77fa2245 | 8 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
1da177e4 LT |
9 | */ |
10 | ||
2bc89b5e | 11 | #include <linux/init.h> |
144d634a | 12 | #include <linux/linkage.h> |
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> |
1f44a225 | 21 | #include <asm/irq.h> |
1da177e4 | 22 | |
c5328901 MS |
23 | __PT_R0 = __PT_GPRS |
24 | __PT_R1 = __PT_GPRS + 4 | |
25 | __PT_R2 = __PT_GPRS + 8 | |
26 | __PT_R3 = __PT_GPRS + 12 | |
27 | __PT_R4 = __PT_GPRS + 16 | |
28 | __PT_R5 = __PT_GPRS + 20 | |
29 | __PT_R6 = __PT_GPRS + 24 | |
30 | __PT_R7 = __PT_GPRS + 28 | |
31 | __PT_R8 = __PT_GPRS + 32 | |
32 | __PT_R9 = __PT_GPRS + 36 | |
33 | __PT_R10 = __PT_GPRS + 40 | |
34 | __PT_R11 = __PT_GPRS + 44 | |
35 | __PT_R12 = __PT_GPRS + 48 | |
36 | __PT_R13 = __PT_GPRS + 524 | |
37 | __PT_R14 = __PT_GPRS + 56 | |
38 | __PT_R15 = __PT_GPRS + 60 | |
1da177e4 | 39 | |
753c4dd6 | 40 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
b6ef5bb3 | 41 | _TIF_MCCK_PENDING | _TIF_PER_TRAP ) |
753c4dd6 | 42 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 43 | _TIF_MCCK_PENDING) |
b6ef5bb3 MS |
44 | _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
45 | _TIF_SYSCALL_TRACEPOINT) | |
1da177e4 LT |
46 | |
47 | STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER | |
48 | STACK_SIZE = 1 << STACK_SHIFT | |
dc7ee00d | 49 | STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE |
1da177e4 LT |
50 | |
51 | #define BASED(name) name-system_call(%r13) | |
52 | ||
1f194a4c | 53 | .macro TRACE_IRQS_ON |
c5328901 | 54 | #ifdef CONFIG_TRACE_IRQFLAGS |
50bec4ce | 55 | basr %r2,%r0 |
c5328901 MS |
56 | l %r1,BASED(.Lhardirqs_on) |
57 | basr %r14,%r1 # call trace_hardirqs_on_caller | |
58 | #endif | |
1f194a4c HC |
59 | .endm |
60 | ||
61 | .macro TRACE_IRQS_OFF | |
c5328901 | 62 | #ifdef CONFIG_TRACE_IRQFLAGS |
50bec4ce | 63 | basr %r2,%r0 |
c5328901 MS |
64 | l %r1,BASED(.Lhardirqs_off) |
65 | basr %r14,%r1 # call trace_hardirqs_off_caller | |
411788ea | 66 | #endif |
c5328901 | 67 | .endm |
411788ea | 68 | |
411788ea | 69 | .macro LOCKDEP_SYS_EXIT |
c5328901 MS |
70 | #ifdef CONFIG_LOCKDEP |
71 | tm __PT_PSW+1(%r11),0x01 # returning to user ? | |
72 | jz .+10 | |
411788ea | 73 | l %r1,BASED(.Llockdep_sys_exit) |
c5328901 | 74 | basr %r14,%r1 # call lockdep_sys_exit |
1f194a4c | 75 | #endif |
987ad70a MS |
76 | .endm |
77 | ||
c5328901 | 78 | .macro CHECK_STACK stacksize,savearea |
63b12246 | 79 | #ifdef CONFIG_CHECK_STACK |
c5328901 MS |
80 | tml %r15,\stacksize - CONFIG_STACK_GUARD |
81 | la %r14,\savearea | |
82 | jz stack_overflow | |
63b12246 | 83 | #endif |
63b12246 MS |
84 | .endm |
85 | ||
c5328901 MS |
86 | .macro SWITCH_ASYNC savearea,stack,shift |
87 | tmh %r8,0x0001 # interrupting from user ? | |
88 | jnz 1f | |
89 | lr %r14,%r9 | |
90 | sl %r14,BASED(.Lcritical_start) | |
91 | cl %r14,BASED(.Lcritical_length) | |
92 | jhe 0f | |
93 | la %r11,\savearea # inside critical section, do cleanup | |
94 | bras %r14,cleanup_critical | |
95 | tmh %r8,0x0001 # retest problem state after cleanup | |
96 | jnz 1f | |
97 | 0: l %r14,\stack # are we already on the target stack? | |
1da177e4 | 98 | slr %r14,%r15 |
c5328901 MS |
99 | sra %r14,\shift |
100 | jnz 1f | |
101 | CHECK_STACK 1<<\shift,\savearea | |
dc7ee00d | 102 | ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
c5328901 MS |
103 | j 2f |
104 | 1: l %r15,\stack # load target stack | |
dc7ee00d | 105 | 2: la %r11,STACK_FRAME_OVERHEAD(%r15) |
77fa2245 HC |
106 | .endm |
107 | ||
c5328901 MS |
108 | .macro ADD64 high,low,timer |
109 | al \high,\timer | |
4c1051e3 | 110 | al \low,4+\timer |
c5328901 MS |
111 | brc 12,.+8 |
112 | ahi \high,1 | |
1da177e4 LT |
113 | .endm |
114 | ||
c5328901 MS |
115 | .macro SUB64 high,low,timer |
116 | sl \high,\timer | |
4c1051e3 | 117 | sl \low,4+\timer |
c5328901 MS |
118 | brc 3,.+8 |
119 | ahi \high,-1 | |
120 | .endm | |
121 | ||
122 | .macro UPDATE_VTIME high,low,enter_timer | |
123 | lm \high,\low,__LC_EXIT_TIMER | |
124 | SUB64 \high,\low,\enter_timer | |
125 | ADD64 \high,\low,__LC_USER_TIMER | |
126 | stm \high,\low,__LC_USER_TIMER | |
127 | lm \high,\low,__LC_LAST_UPDATE_TIMER | |
128 | SUB64 \high,\low,__LC_EXIT_TIMER | |
129 | ADD64 \high,\low,__LC_SYSTEM_TIMER | |
130 | stm \high,\low,__LC_SYSTEM_TIMER | |
131 | mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer | |
1da177e4 LT |
132 | .endm |
133 | ||
1e54622e | 134 | .macro REENABLE_IRQS |
c5328901 MS |
135 | st %r8,__LC_RETURN_PSW |
136 | ni __LC_RETURN_PSW,0xbf | |
137 | ssm __LC_RETURN_PSW | |
1e54622e MS |
138 | .endm |
139 | ||
860dba45 MS |
140 | .section .kprobes.text, "ax" |
141 | ||
1da177e4 LT |
142 | /* |
143 | * Scheduler resume function, called by switch_to | |
144 | * gpr2 = (task_struct *) prev | |
145 | * gpr3 = (task_struct *) next | |
146 | * Returns: | |
147 | * gpr2 = prev | |
148 | */ | |
144d634a | 149 | ENTRY(__switch_to) |
eda0c6d6 MS |
150 | stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
151 | st %r15,__THREAD_ksp(%r2) # store kernel stack of prev | |
c5328901 | 152 | l %r4,__THREAD_info(%r2) # get thread_info of prev |
5e9a2692 | 153 | l %r5,__THREAD_info(%r3) # get thread_info of next |
eda0c6d6 | 154 | lr %r15,%r5 |
dc7ee00d | 155 | ahi %r15,STACK_INIT # end of kernel stack of next |
eda0c6d6 MS |
156 | st %r3,__LC_CURRENT # store task struct of next |
157 | st %r5,__LC_THREAD_INFO # store thread info of next | |
158 | st %r15,__LC_KERNEL_STACK # store end of kernel stack | |
159 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
160 | mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next | |
161 | l %r15,__THREAD_ksp(%r3) # load kernel stack of next | |
77fa2245 | 162 | tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? |
c5328901 | 163 | jz 0f |
5e9a2692 MS |
164 | ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev |
165 | oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next | |
eda0c6d6 | 166 | 0: lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
1da177e4 LT |
167 | br %r14 |
168 | ||
169 | __critical_start: | |
170 | /* | |
171 | * SVC interrupt handler routine. System calls are synchronous events and | |
172 | * are executed with interrupts enabled. | |
173 | */ | |
174 | ||
144d634a | 175 | ENTRY(system_call) |
c185b783 | 176 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
177 | sysc_stm: |
178 | stm %r8,%r15,__LC_SAVE_AREA_SYNC | |
179 | l %r12,__LC_THREAD_INFO | |
180 | l %r13,__LC_SVC_NEW_PSW+4 | |
181 | sysc_per: | |
182 | l %r15,__LC_KERNEL_STACK | |
c5328901 | 183 | la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs |
1da177e4 | 184 | sysc_vtime: |
c5328901 MS |
185 | UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER |
186 | stm %r0,%r7,__PT_R0(%r11) | |
187 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC | |
188 | mvc __PT_PSW(8,%r11),__LC_SVC_OLD_PSW | |
aa33c8cb | 189 | mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
1da177e4 | 190 | sysc_do_svc: |
c5328901 | 191 | oi __TI_flags+3(%r12),_TIF_SYSCALL |
61649881 | 192 | l %r10,__TI_sysc_table(%r12) # 31 bit system call table |
aa33c8cb | 193 | lh %r8,__PT_INT_CODE+2(%r11) |
c5328901 MS |
194 | sla %r8,2 # shift and test for svc0 |
195 | jnz sysc_nr_ok | |
1da177e4 LT |
196 | # svc 0: system call number in %r1 |
197 | cl %r1,BASED(.Lnr_syscalls) | |
c5328901 | 198 | jnl sysc_nr_ok |
aa33c8cb | 199 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 MS |
200 | lr %r8,%r1 |
201 | sla %r8,2 | |
1da177e4 | 202 | sysc_nr_ok: |
c5328901 MS |
203 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) |
204 | st %r2,__PT_ORIG_GPR2(%r11) | |
205 | st %r7,STACK_FRAME_OVERHEAD(%r15) | |
206 | l %r9,0(%r8,%r10) # get system call addr. | |
b6ef5bb3 | 207 | tm __TI_flags+2(%r12),_TIF_TRACE >> 8 |
c5328901 MS |
208 | jnz sysc_tracesys |
209 | basr %r14,%r9 # call sys_xxxx | |
210 | st %r2,__PT_R2(%r11) # store return value | |
1da177e4 LT |
211 | |
212 | sysc_return: | |
6a2df3a8 MS |
213 | LOCKDEP_SYS_EXIT |
214 | sysc_tif: | |
c5328901 MS |
215 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
216 | jno sysc_restore | |
1de3447a | 217 | tm __TI_flags+3(%r12),_TIF_WORK_SVC |
c5328901 | 218 | jnz sysc_work # check for work |
b6ef5bb3 | 219 | ni __TI_flags+3(%r12),255-_TIF_SYSCALL |
411788ea | 220 | sysc_restore: |
c5328901 MS |
221 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) |
222 | stpt __LC_EXIT_TIMER | |
223 | lm %r0,%r15,__PT_R0(%r11) | |
224 | lpsw __LC_RETURN_PSW | |
411788ea HC |
225 | sysc_done: |
226 | ||
43d399d2 MS |
227 | # |
228 | # One of the work bits is on. Find out which one. | |
229 | # | |
b6ef5bb3 | 230 | sysc_work: |
1de3447a | 231 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
c5328901 | 232 | jo sysc_mcck_pending |
1de3447a | 233 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
c5328901 | 234 | jo sysc_reschedule |
39efd4ec MS |
235 | tm __TI_flags+3(%r12),_TIF_PER_TRAP |
236 | jo sysc_singlestep | |
1de3447a | 237 | tm __TI_flags+3(%r12),_TIF_SIGPENDING |
c5328901 | 238 | jo sysc_sigpending |
1de3447a | 239 | tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME |
c5328901 | 240 | jo sysc_notify_resume |
c5328901 | 241 | j sysc_return # beware of critical section cleanup |
1da177e4 LT |
242 | |
243 | # | |
244 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
245 | # |
246 | sysc_reschedule: | |
247 | l %r1,BASED(.Lschedule) | |
6a2df3a8 | 248 | la %r14,BASED(sysc_return) |
c5328901 | 249 | br %r1 # call schedule |
1da177e4 | 250 | |
77fa2245 HC |
251 | # |
252 | # _TIF_MCCK_PENDING is set, call handler | |
253 | # | |
254 | sysc_mcck_pending: | |
c5328901 | 255 | l %r1,BASED(.Lhandle_mcck) |
6a2df3a8 | 256 | la %r14,BASED(sysc_return) |
77fa2245 HC |
257 | br %r1 # TIF bit will be cleared by handler |
258 | ||
1da177e4 | 259 | # |
02a029b3 | 260 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 261 | # |
25d83cbf | 262 | sysc_sigpending: |
c5328901 | 263 | lr %r2,%r11 # pass pointer to pt_regs |
25d83cbf HC |
264 | l %r1,BASED(.Ldo_signal) |
265 | basr %r14,%r1 # call do_signal | |
b6ef5bb3 | 266 | tm __TI_flags+3(%r12),_TIF_SYSCALL |
c5328901 MS |
267 | jno sysc_return |
268 | lm %r2,%r7,__PT_R2(%r11) # load svc arguments | |
dbbfe487 | 269 | l %r10,__TI_sysc_table(%r12) # 31 bit system call table |
c5328901 | 270 | xr %r8,%r8 # svc 0 returns -ENOSYS |
aa33c8cb | 271 | clc __PT_INT_CODE+2(2,%r11),BASED(.Lnr_syscalls+2) |
c5328901 | 272 | jnl sysc_nr_ok # invalid svc number -> do svc 0 |
aa33c8cb | 273 | lh %r8,__PT_INT_CODE+2(%r11) # load new svc number |
c5328901 MS |
274 | sla %r8,2 |
275 | j sysc_nr_ok # restart svc | |
1da177e4 | 276 | |
753c4dd6 MS |
277 | # |
278 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
279 | # | |
280 | sysc_notify_resume: | |
c5328901 | 281 | lr %r2,%r11 # pass pointer to pt_regs |
753c4dd6 | 282 | l %r1,BASED(.Ldo_notify_resume) |
6a2df3a8 | 283 | la %r14,BASED(sysc_return) |
753c4dd6 MS |
284 | br %r1 # call do_notify_resume |
285 | ||
1da177e4 | 286 | # |
5e9a2692 | 287 | # _TIF_PER_TRAP is set, call do_per_trap |
1da177e4 LT |
288 | # |
289 | sysc_singlestep: | |
39efd4ec | 290 | ni __TI_flags+3(%r12),255-_TIF_PER_TRAP |
c5328901 MS |
291 | lr %r2,%r11 # pass pointer to pt_regs |
292 | l %r1,BASED(.Ldo_per_trap) | |
293 | la %r14,BASED(sysc_return) | |
294 | br %r1 # call do_per_trap | |
1da177e4 | 295 | |
1da177e4 | 296 | # |
753c4dd6 MS |
297 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
298 | # and after the system call | |
1da177e4 LT |
299 | # |
300 | sysc_tracesys: | |
c5328901 MS |
301 | l %r1,BASED(.Ltrace_enter) |
302 | lr %r2,%r11 # pass pointer to pt_regs | |
1da177e4 | 303 | la %r3,0 |
1de3447a | 304 | xr %r0,%r0 |
aa33c8cb | 305 | icm %r0,3,__PT_INT_CODE+2(%r11) |
c5328901 MS |
306 | st %r0,__PT_R2(%r11) |
307 | basr %r14,%r1 # call do_syscall_trace_enter | |
753c4dd6 | 308 | cl %r2,BASED(.Lnr_syscalls) |
c5328901 MS |
309 | jnl sysc_tracenogo |
310 | lr %r8,%r2 | |
311 | sll %r8,2 | |
312 | l %r9,0(%r8,%r10) | |
1da177e4 | 313 | sysc_tracego: |
c5328901 MS |
314 | lm %r3,%r7,__PT_R3(%r11) |
315 | st %r7,STACK_FRAME_OVERHEAD(%r15) | |
316 | l %r2,__PT_ORIG_GPR2(%r11) | |
317 | basr %r14,%r9 # call sys_xxx | |
318 | st %r2,__PT_R2(%r11) # store return value | |
1da177e4 | 319 | sysc_tracenogo: |
b6ef5bb3 | 320 | tm __TI_flags+2(%r12),_TIF_TRACE >> 8 |
c5328901 | 321 | jz sysc_return |
753c4dd6 | 322 | l %r1,BASED(.Ltrace_exit) |
c5328901 | 323 | lr %r2,%r11 # pass pointer to pt_regs |
1da177e4 | 324 | la %r14,BASED(sysc_return) |
c5328901 | 325 | br %r1 # call do_syscall_trace_exit |
1da177e4 LT |
326 | |
327 | # | |
328 | # a new process exits the kernel with ret_from_fork | |
329 | # | |
144d634a | 330 | ENTRY(ret_from_fork) |
c5328901 MS |
331 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
332 | l %r12,__LC_THREAD_INFO | |
1da177e4 | 333 | l %r13,__LC_SVC_NEW_PSW+4 |
37fe5d41 AV |
334 | l %r1,BASED(.Lschedule_tail) |
335 | basr %r14,%r1 # call schedule_tail | |
336 | TRACE_IRQS_ON | |
337 | ssm __LC_SVC_NEW_PSW # reenable interrupts | |
30dcb099 AV |
338 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? |
339 | jne sysc_tracenogo | |
340 | # it's a kernel thread | |
341 | lm %r9,%r10,__PT_R9(%r11) # load gprs | |
37fe5d41 AV |
342 | ENTRY(kernel_thread_starter) |
343 | la %r2,0(%r10) | |
344 | basr %r14,%r9 | |
30dcb099 | 345 | j sysc_tracenogo |
1da177e4 LT |
346 | |
347 | /* | |
348 | * Program check handler routine | |
349 | */ | |
350 | ||
144d634a | 351 | ENTRY(pgm_check_handler) |
c185b783 | 352 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
353 | stm %r8,%r15,__LC_SAVE_AREA_SYNC |
354 | l %r12,__LC_THREAD_INFO | |
355 | l %r13,__LC_SVC_NEW_PSW+4 | |
356 | lm %r8,%r9,__LC_PGM_OLD_PSW | |
357 | tmh %r8,0x0001 # test problem state bit | |
358 | jnz 1f # -> fault in user space | |
359 | tmh %r8,0x4000 # PER bit set in old PSW ? | |
360 | jnz 0f # -> enabled, can't be a double fault | |
361 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
362 | jnz pgm_svcper # -> single stepped svc | |
363 | 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC | |
dc7ee00d | 364 | ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
c5328901 MS |
365 | j 2f |
366 | 1: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER | |
367 | l %r15,__LC_KERNEL_STACK | |
dc7ee00d | 368 | 2: la %r11,STACK_FRAME_OVERHEAD(%r15) |
c5328901 MS |
369 | stm %r0,%r7,__PT_R0(%r11) |
370 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC | |
371 | stm %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
372 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
373 | mvc __PT_INT_PARM_LONG(4,%r11),__LC_TRANS_EXC_CODE | |
c5328901 MS |
374 | tm __LC_PGM_ILC+3,0x80 # check for per exception |
375 | jz 0f | |
1de3447a | 376 | l %r1,__TI_task(%r12) |
c5328901 MS |
377 | tmh %r8,0x0001 # kernel per event ? |
378 | jz pgm_kprobe | |
379 | oi __TI_flags+3(%r12),_TIF_PER_TRAP | |
5e9a2692 | 380 | mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS |
c5328901 | 381 | mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE |
5e9a2692 | 382 | mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID |
aa33c8cb | 383 | 0: REENABLE_IRQS |
c5328901 | 384 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) |
1de3447a | 385 | l %r1,BASED(.Ljump_table) |
c5328901 | 386 | la %r10,0x7f |
aa33c8cb | 387 | n %r10,__PT_INT_CODE(%r11) |
c5328901 MS |
388 | je sysc_return |
389 | sll %r10,2 | |
390 | l %r1,0(%r10,%r1) # load address of handler routine | |
391 | lr %r2,%r11 # pass pointer to pt_regs | |
1de3447a | 392 | basr %r14,%r1 # branch to interrupt-handler |
c5328901 | 393 | j sysc_return |
1da177e4 LT |
394 | |
395 | # | |
c5328901 | 396 | # PER event in supervisor state, must be kprobes |
1da177e4 | 397 | # |
c5328901 MS |
398 | pgm_kprobe: |
399 | REENABLE_IRQS | |
400 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
401 | l %r1,BASED(.Ldo_per_trap) | |
402 | lr %r2,%r11 # pass pointer to pt_regs | |
403 | basr %r14,%r1 # call do_per_trap | |
404 | j sysc_return | |
1da177e4 | 405 | |
4ba069b8 | 406 | # |
c5328901 | 407 | # single stepped system call |
4ba069b8 | 408 | # |
c5328901 MS |
409 | pgm_svcper: |
410 | oi __TI_flags+3(%r12),_TIF_PER_TRAP | |
411 | mvc __LC_RETURN_PSW(4),__LC_SVC_NEW_PSW | |
412 | mvc __LC_RETURN_PSW+4(4),BASED(.Lsysc_per) | |
413 | lpsw __LC_RETURN_PSW # branch to sysc_per and enable irqs | |
4ba069b8 | 414 | |
1da177e4 LT |
415 | /* |
416 | * IO interrupt handler routine | |
417 | */ | |
418 | ||
144d634a | 419 | ENTRY(io_int_handler) |
1da177e4 | 420 | stck __LC_INT_CLOCK |
9cfb9b3c | 421 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
422 | stm %r8,%r15,__LC_SAVE_AREA_ASYNC |
423 | l %r12,__LC_THREAD_INFO | |
424 | l %r13,__LC_SVC_NEW_PSW+4 | |
425 | lm %r8,%r9,__LC_IO_OLD_PSW | |
426 | tmh %r8,0x0001 # interrupting from user ? | |
427 | jz io_skip | |
428 | UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER | |
429 | io_skip: | |
430 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
431 | stm %r0,%r7,__PT_R0(%r11) | |
432 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC | |
433 | stm %r8,%r9,__PT_PSW(%r11) | |
48f6b00c | 434 | mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID |
1f194a4c | 435 | TRACE_IRQS_OFF |
c5328901 | 436 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) |
48f6b00c | 437 | io_loop: |
c5328901 MS |
438 | l %r1,BASED(.Ldo_IRQ) |
439 | lr %r2,%r11 # pass pointer to pt_regs | |
1f44a225 MS |
440 | lhi %r3,IO_INTERRUPT |
441 | tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ? | |
442 | jz io_call | |
443 | lhi %r3,THIN_INTERRUPT | |
444 | io_call: | |
c5328901 | 445 | basr %r14,%r1 # call do_IRQ |
48f6b00c MS |
446 | tm __LC_MACHINE_FLAGS+2,0x10 # MACHINE_FLAG_LPAR |
447 | jz io_return | |
448 | tpi 0 | |
449 | jz io_return | |
450 | mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID | |
451 | j io_loop | |
1da177e4 | 452 | io_return: |
6a2df3a8 MS |
453 | LOCKDEP_SYS_EXIT |
454 | TRACE_IRQS_ON | |
455 | io_tif: | |
1de3447a | 456 | tm __TI_flags+3(%r12),_TIF_WORK_INT |
c5328901 | 457 | jnz io_work # there is work to do (signals etc.) |
411788ea | 458 | io_restore: |
c5328901 | 459 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) |
c5328901 MS |
460 | stpt __LC_EXIT_TIMER |
461 | lm %r0,%r15,__PT_R0(%r11) | |
462 | lpsw __LC_RETURN_PSW | |
ae6aa2ea | 463 | io_done: |
1da177e4 | 464 | |
2688905e | 465 | # |
43d399d2 MS |
466 | # There is work todo, find out in which context we have been interrupted: |
467 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
468 | # 2) if we return to kernel code and preemptive scheduling is enabled check | |
469 | # the preemption counter and if it is zero call preempt_schedule_irq | |
470 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
471 | # |
472 | io_work: | |
c5328901 MS |
473 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
474 | jo io_work_user # yes -> do resched & signal | |
43d399d2 | 475 | #ifdef CONFIG_PREEMPT |
2688905e | 476 | # check for preemptive scheduling |
1de3447a | 477 | icm %r0,15,__TI_precount(%r12) |
c5328901 | 478 | jnz io_restore # preemption disabled |
1de3447a | 479 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
c5328901 | 480 | jno io_restore |
43d399d2 | 481 | # switch to kernel stack |
c5328901 MS |
482 | l %r1,__PT_R15(%r11) |
483 | ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
484 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
485 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) | |
486 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 487 | lr %r15,%r1 |
6a2df3a8 MS |
488 | # TRACE_IRQS_ON already done at io_return, call |
489 | # TRACE_IRQS_OFF to keep things symmetrical | |
490 | TRACE_IRQS_OFF | |
c5328901 | 491 | l %r1,BASED(.Lpreempt_irq) |
6a2df3a8 | 492 | basr %r14,%r1 # call preempt_schedule_irq |
c5328901 | 493 | j io_return |
6a2df3a8 | 494 | #else |
c5328901 | 495 | j io_restore |
6a2df3a8 | 496 | #endif |
1da177e4 | 497 | |
43d399d2 MS |
498 | # |
499 | # Need to do work before returning to userspace, switch to kernel stack | |
500 | # | |
2688905e | 501 | io_work_user: |
1da177e4 | 502 | l %r1,__LC_KERNEL_STACK |
c5328901 MS |
503 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
504 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) | |
505 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 506 | lr %r15,%r1 |
6a2df3a8 | 507 | |
1da177e4 LT |
508 | # |
509 | # One of the work bits is on. Find out which one. | |
43d399d2 | 510 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
25d83cbf | 511 | # and _TIF_MCCK_PENDING |
1da177e4 | 512 | # |
6a2df3a8 | 513 | io_work_tif: |
1de3447a | 514 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
c5328901 | 515 | jo io_mcck_pending |
1de3447a | 516 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
c5328901 | 517 | jo io_reschedule |
1de3447a | 518 | tm __TI_flags+3(%r12),_TIF_SIGPENDING |
c5328901 | 519 | jo io_sigpending |
1de3447a | 520 | tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME |
c5328901 MS |
521 | jo io_notify_resume |
522 | j io_return # beware of critical section cleanup | |
1da177e4 | 523 | |
77fa2245 HC |
524 | # |
525 | # _TIF_MCCK_PENDING is set, call handler | |
526 | # | |
527 | io_mcck_pending: | |
6a2df3a8 | 528 | # TRACE_IRQS_ON already done at io_return |
c5328901 | 529 | l %r1,BASED(.Lhandle_mcck) |
b771aeac | 530 | basr %r14,%r1 # TIF bit will be cleared by handler |
6a2df3a8 | 531 | TRACE_IRQS_OFF |
c5328901 | 532 | j io_return |
77fa2245 | 533 | |
1da177e4 LT |
534 | # |
535 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
536 | # |
537 | io_reschedule: | |
6a2df3a8 | 538 | # TRACE_IRQS_ON already done at io_return |
25d83cbf | 539 | l %r1,BASED(.Lschedule) |
c5328901 | 540 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 541 | basr %r14,%r1 # call scheduler |
c5328901 | 542 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 543 | TRACE_IRQS_OFF |
c5328901 | 544 | j io_return |
1da177e4 LT |
545 | |
546 | # | |
02a029b3 | 547 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 548 | # |
25d83cbf | 549 | io_sigpending: |
6a2df3a8 | 550 | # TRACE_IRQS_ON already done at io_return |
25d83cbf | 551 | l %r1,BASED(.Ldo_signal) |
c5328901 MS |
552 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
553 | lr %r2,%r11 # pass pointer to pt_regs | |
25d83cbf | 554 | basr %r14,%r1 # call do_signal |
c5328901 | 555 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 556 | TRACE_IRQS_OFF |
c5328901 | 557 | j io_return |
1da177e4 | 558 | |
753c4dd6 MS |
559 | # |
560 | # _TIF_SIGPENDING is set, call do_signal | |
561 | # | |
562 | io_notify_resume: | |
6a2df3a8 | 563 | # TRACE_IRQS_ON already done at io_return |
753c4dd6 | 564 | l %r1,BASED(.Ldo_notify_resume) |
c5328901 MS |
565 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
566 | lr %r2,%r11 # pass pointer to pt_regs | |
567 | basr %r14,%r1 # call do_notify_resume | |
568 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 569 | TRACE_IRQS_OFF |
c5328901 | 570 | j io_return |
753c4dd6 | 571 | |
1da177e4 LT |
572 | /* |
573 | * External interrupt handler routine | |
574 | */ | |
575 | ||
144d634a | 576 | ENTRY(ext_int_handler) |
1da177e4 | 577 | stck __LC_INT_CLOCK |
9cfb9b3c | 578 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
579 | stm %r8,%r15,__LC_SAVE_AREA_ASYNC |
580 | l %r12,__LC_THREAD_INFO | |
581 | l %r13,__LC_SVC_NEW_PSW+4 | |
582 | lm %r8,%r9,__LC_EXT_OLD_PSW | |
583 | tmh %r8,0x0001 # interrupting from user ? | |
584 | jz ext_skip | |
585 | UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER | |
586 | ext_skip: | |
587 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
588 | stm %r0,%r7,__PT_R0(%r11) | |
589 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC | |
590 | stm %r8,%r9,__PT_PSW(%r11) | |
48f6b00c MS |
591 | mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR |
592 | mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS | |
1f194a4c | 593 | TRACE_IRQS_OFF |
1f44a225 | 594 | l %r1,BASED(.Ldo_IRQ) |
c5328901 | 595 | lr %r2,%r11 # pass pointer to pt_regs |
1f44a225 MS |
596 | lhi %r3,EXT_INTERRUPT |
597 | basr %r14,%r1 # call do_IRQ | |
c5328901 | 598 | j io_return |
1da177e4 | 599 | |
4c1051e3 MS |
600 | /* |
601 | * Load idle PSW. The second "half" of this function is in cleanup_idle. | |
602 | */ | |
603 | ENTRY(psw_idle) | |
27f6b416 | 604 | st %r3,__SF_EMPTY(%r15) |
4c1051e3 MS |
605 | basr %r1,0 |
606 | la %r1,psw_idle_lpsw+4-.(%r1) | |
607 | st %r1,__SF_EMPTY+4(%r15) | |
608 | oi __SF_EMPTY+4(%r15),0x80 | |
27f6b416 MS |
609 | stck __CLOCK_IDLE_ENTER(%r2) |
610 | stpt __TIMER_IDLE_ENTER(%r2) | |
4c1051e3 MS |
611 | psw_idle_lpsw: |
612 | lpsw __SF_EMPTY(%r15) | |
613 | br %r14 | |
614 | psw_idle_end: | |
615 | ||
ae6aa2ea MS |
616 | __critical_end: |
617 | ||
1da177e4 LT |
618 | /* |
619 | * Machine check handler routines | |
620 | */ | |
621 | ||
144d634a | 622 | ENTRY(mcck_int_handler) |
6377981f | 623 | stck __LC_MCCK_CLOCK |
77fa2245 HC |
624 | spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer |
625 | lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs | |
c5328901 MS |
626 | l %r12,__LC_THREAD_INFO |
627 | l %r13,__LC_SVC_NEW_PSW+4 | |
628 | lm %r8,%r9,__LC_MCK_OLD_PSW | |
25d83cbf | 629 | tm __LC_MCCK_CODE,0x80 # system damage? |
c5328901 MS |
630 | jo mcck_panic # yes -> rest of mcck code invalid |
631 | la %r14,__LC_CPU_TIMER_SAVE_AREA | |
632 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
63b12246 | 633 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
c5328901 | 634 | jo 3f |
63b12246 MS |
635 | la %r14,__LC_SYNC_ENTER_TIMER |
636 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
c5328901 | 637 | jl 0f |
63b12246 MS |
638 | la %r14,__LC_ASYNC_ENTER_TIMER |
639 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 640 | jl 1f |
63b12246 | 641 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
642 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
643 | jl 2f | |
63b12246 | 644 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 645 | 2: spt 0(%r14) |
6377981f | 646 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c5328901 MS |
647 | 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
648 | jno mcck_panic # no -> skip cleanup critical | |
649 | tm %r8,0x0001 # interrupting from user ? | |
650 | jz mcck_skip | |
651 | UPDATE_VTIME %r14,%r15,__LC_MCCK_ENTER_TIMER | |
652 | mcck_skip: | |
653 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+32,__LC_PANIC_STACK,PAGE_SHIFT | |
6551fbdf MS |
654 | stm %r0,%r7,__PT_R0(%r11) |
655 | mvc __PT_R8(32,%r11),__LC_GPREGS_SAVE_AREA+32 | |
c5328901 MS |
656 | stm %r8,%r9,__PT_PSW(%r11) |
657 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
658 | l %r1,BASED(.Ldo_machine_check) | |
659 | lr %r2,%r11 # pass pointer to pt_regs | |
660 | basr %r14,%r1 # call s390_do_machine_check | |
661 | tm __PT_PSW+1(%r11),0x01 # returning to user ? | |
662 | jno mcck_return | |
25d83cbf | 663 | l %r1,__LC_KERNEL_STACK # switch to kernel stack |
c5328901 MS |
664 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
665 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) | |
666 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
77fa2245 | 667 | lr %r15,%r1 |
c5328901 | 668 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
1de3447a | 669 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
c5328901 | 670 | jno mcck_return |
1f194a4c | 671 | TRACE_IRQS_OFF |
c5328901 MS |
672 | l %r1,BASED(.Lhandle_mcck) |
673 | basr %r14,%r1 # call s390_handle_mcck | |
1f194a4c | 674 | TRACE_IRQS_ON |
1da177e4 | 675 | mcck_return: |
c5328901 | 676 | mvc __LC_RETURN_MCCK_PSW(8),__PT_PSW(%r11) # move return PSW |
63b12246 | 677 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
c5328901 MS |
678 | jno 0f |
679 | lm %r0,%r15,__PT_R0(%r11) | |
63b12246 | 680 | stpt __LC_EXIT_TIMER |
c5328901 MS |
681 | lpsw __LC_RETURN_MCCK_PSW |
682 | 0: lm %r0,%r15,__PT_R0(%r11) | |
683 | lpsw __LC_RETURN_MCCK_PSW | |
63b12246 | 684 | |
c5328901 MS |
685 | mcck_panic: |
686 | l %r14,__LC_PANIC_STACK | |
687 | slr %r14,%r15 | |
688 | sra %r14,PAGE_SHIFT | |
689 | jz 0f | |
690 | l %r15,__LC_PANIC_STACK | |
dc7ee00d | 691 | j mcck_skip |
c5328901 MS |
692 | 0: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
693 | j mcck_skip | |
1da177e4 | 694 | |
7dd6b334 MH |
695 | # |
696 | # PSW restart interrupt handler | |
697 | # | |
8b646bd7 | 698 | ENTRY(restart_int_handler) |
c5328901 | 699 | st %r15,__LC_SAVE_AREA_RESTART |
8b646bd7 | 700 | l %r15,__LC_RESTART_STACK |
c5328901 | 701 | ahi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 702 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
703 | stm %r0,%r14,__PT_R0(%r15) |
704 | mvc __PT_R15(4,%r15),__LC_SAVE_AREA_RESTART | |
705 | mvc __PT_PSW(8,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
706 | ahi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
707 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
708 | l %r1,__LC_RESTART_FN # load fn, parm & source cpu |
709 | l %r2,__LC_RESTART_DATA | |
710 | l %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
711 | ltr %r3,%r3 # test source cpu address |
712 | jm 1f # negative -> skip source stop | |
eb546195 | 713 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
714 | brc 10,0b # wait for status stored |
715 | 1: basr %r14,%r1 # call function | |
716 | stap __SF_EMPTY(%r15) # store cpu address | |
717 | lh %r3,__SF_EMPTY(%r15) | |
eb546195 | 718 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
719 | brc 2,2b |
720 | 3: j 3b | |
7dd6b334 | 721 | |
860dba45 MS |
722 | .section .kprobes.text, "ax" |
723 | ||
1da177e4 LT |
724 | #ifdef CONFIG_CHECK_STACK |
725 | /* | |
726 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
727 | * No need to properly save the registers, we are going to panic anyway. | |
728 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
729 | */ | |
730 | stack_overflow: | |
731 | l %r15,__LC_PANIC_STACK # change to panic stack | |
dc7ee00d MS |
732 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
733 | stm %r0,%r7,__PT_R0(%r11) | |
734 | stm %r8,%r9,__PT_PSW(%r11) | |
c5328901 | 735 | mvc __PT_R8(32,%r11),0(%r14) |
c5328901 MS |
736 | l %r1,BASED(1f) |
737 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
738 | lr %r2,%r11 # pass pointer to pt_regs | |
739 | br %r1 # branch to kernel_stack_overflow | |
25d83cbf | 740 | 1: .long kernel_stack_overflow |
1da177e4 LT |
741 | #endif |
742 | ||
c5328901 MS |
743 | cleanup_table: |
744 | .long system_call + 0x80000000 | |
745 | .long sysc_do_svc + 0x80000000 | |
746 | .long sysc_tif + 0x80000000 | |
747 | .long sysc_restore + 0x80000000 | |
748 | .long sysc_done + 0x80000000 | |
749 | .long io_tif + 0x80000000 | |
750 | .long io_restore + 0x80000000 | |
751 | .long io_done + 0x80000000 | |
4c1051e3 MS |
752 | .long psw_idle + 0x80000000 |
753 | .long psw_idle_end + 0x80000000 | |
1da177e4 LT |
754 | |
755 | cleanup_critical: | |
c5328901 MS |
756 | cl %r9,BASED(cleanup_table) # system_call |
757 | jl 0f | |
758 | cl %r9,BASED(cleanup_table+4) # sysc_do_svc | |
759 | jl cleanup_system_call | |
760 | cl %r9,BASED(cleanup_table+8) # sysc_tif | |
761 | jl 0f | |
762 | cl %r9,BASED(cleanup_table+12) # sysc_restore | |
763 | jl cleanup_sysc_tif | |
764 | cl %r9,BASED(cleanup_table+16) # sysc_done | |
765 | jl cleanup_sysc_restore | |
766 | cl %r9,BASED(cleanup_table+20) # io_tif | |
767 | jl 0f | |
768 | cl %r9,BASED(cleanup_table+24) # io_restore | |
769 | jl cleanup_io_tif | |
770 | cl %r9,BASED(cleanup_table+28) # io_done | |
771 | jl cleanup_io_restore | |
4c1051e3 MS |
772 | cl %r9,BASED(cleanup_table+32) # psw_idle |
773 | jl 0f | |
774 | cl %r9,BASED(cleanup_table+36) # psw_idle_end | |
775 | jl cleanup_idle | |
c5328901 | 776 | 0: br %r14 |
1da177e4 LT |
777 | |
778 | cleanup_system_call: | |
c5328901 MS |
779 | # check if stpt has been executed |
780 | cl %r9,BASED(cleanup_system_call_insn) | |
781 | jh 0f | |
1da177e4 | 782 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER |
c5328901 MS |
783 | chi %r11,__LC_SAVE_AREA_ASYNC |
784 | je 0f | |
785 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER | |
786 | 0: # check if stm has been executed | |
787 | cl %r9,BASED(cleanup_system_call_insn+4) | |
788 | jh 0f | |
789 | mvc __LC_SAVE_AREA_SYNC(32),0(%r11) | |
790 | 0: # set up saved registers r12, and r13 | |
791 | st %r12,16(%r11) # r12 thread-info pointer | |
792 | st %r13,20(%r11) # r13 literal-pool pointer | |
793 | # check if the user time calculation has been done | |
794 | cl %r9,BASED(cleanup_system_call_insn+8) | |
795 | jh 0f | |
796 | l %r10,__LC_EXIT_TIMER | |
797 | l %r15,__LC_EXIT_TIMER+4 | |
798 | SUB64 %r10,%r15,__LC_SYNC_ENTER_TIMER | |
799 | ADD64 %r10,%r15,__LC_USER_TIMER | |
800 | st %r10,__LC_USER_TIMER | |
801 | st %r15,__LC_USER_TIMER+4 | |
802 | 0: # check if the system time calculation has been done | |
803 | cl %r9,BASED(cleanup_system_call_insn+12) | |
804 | jh 0f | |
805 | l %r10,__LC_LAST_UPDATE_TIMER | |
806 | l %r15,__LC_LAST_UPDATE_TIMER+4 | |
807 | SUB64 %r10,%r15,__LC_EXIT_TIMER | |
808 | ADD64 %r10,%r15,__LC_SYSTEM_TIMER | |
809 | st %r10,__LC_SYSTEM_TIMER | |
810 | st %r15,__LC_SYSTEM_TIMER+4 | |
811 | 0: # update accounting time stamp | |
1da177e4 | 812 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
c5328901 MS |
813 | # set up saved register 11 |
814 | l %r15,__LC_KERNEL_STACK | |
dc7ee00d MS |
815 | la %r9,STACK_FRAME_OVERHEAD(%r15) |
816 | st %r9,12(%r11) # r11 pt_regs pointer | |
c5328901 | 817 | # fill pt_regs |
dc7ee00d MS |
818 | mvc __PT_R8(32,%r9),__LC_SAVE_AREA_SYNC |
819 | stm %r0,%r7,__PT_R0(%r9) | |
820 | mvc __PT_PSW(8,%r9),__LC_SVC_OLD_PSW | |
821 | mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC | |
c5328901 | 822 | # setup saved register 15 |
c5328901 MS |
823 | st %r15,28(%r11) # r15 stack pointer |
824 | # set new psw address and exit | |
825 | l %r9,BASED(cleanup_table+4) # sysc_do_svc + 0x80000000 | |
1da177e4 LT |
826 | br %r14 |
827 | cleanup_system_call_insn: | |
25d83cbf | 828 | .long system_call + 0x80000000 |
c5328901 MS |
829 | .long sysc_stm + 0x80000000 |
830 | .long sysc_vtime + 0x80000000 + 36 | |
831 | .long sysc_vtime + 0x80000000 + 76 | |
1da177e4 | 832 | |
6a2df3a8 | 833 | cleanup_sysc_tif: |
c5328901 | 834 | l %r9,BASED(cleanup_table+8) # sysc_tif + 0x80000000 |
1da177e4 LT |
835 | br %r14 |
836 | ||
6a2df3a8 | 837 | cleanup_sysc_restore: |
c5328901 MS |
838 | cl %r9,BASED(cleanup_sysc_restore_insn) |
839 | jhe 0f | |
840 | l %r9,12(%r11) # get saved pointer to pt_regs | |
841 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) | |
842 | mvc 0(32,%r11),__PT_R8(%r9) | |
843 | lm %r0,%r7,__PT_R0(%r9) | |
844 | 0: lm %r8,%r9,__LC_RETURN_PSW | |
1da177e4 | 845 | br %r14 |
6a2df3a8 | 846 | cleanup_sysc_restore_insn: |
411788ea | 847 | .long sysc_done - 4 + 0x80000000 |
1da177e4 | 848 | |
6a2df3a8 | 849 | cleanup_io_tif: |
c5328901 | 850 | l %r9,BASED(cleanup_table+20) # io_tif + 0x80000000 |
176b1803 MS |
851 | br %r14 |
852 | ||
6a2df3a8 | 853 | cleanup_io_restore: |
c5328901 MS |
854 | cl %r9,BASED(cleanup_io_restore_insn) |
855 | jhe 0f | |
856 | l %r9,12(%r11) # get saved r11 pointer to pt_regs | |
857 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) | |
c5328901 MS |
858 | mvc 0(32,%r11),__PT_R8(%r9) |
859 | lm %r0,%r7,__PT_R0(%r9) | |
860 | 0: lm %r8,%r9,__LC_RETURN_PSW | |
ae6aa2ea | 861 | br %r14 |
6a2df3a8 | 862 | cleanup_io_restore_insn: |
411788ea | 863 | .long io_done - 4 + 0x80000000 |
ae6aa2ea | 864 | |
4c1051e3 MS |
865 | cleanup_idle: |
866 | # copy interrupt clock & cpu timer | |
27f6b416 MS |
867 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK |
868 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER | |
4c1051e3 MS |
869 | chi %r11,__LC_SAVE_AREA_ASYNC |
870 | je 0f | |
27f6b416 MS |
871 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK |
872 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER | |
4c1051e3 MS |
873 | 0: # check if stck has been executed |
874 | cl %r9,BASED(cleanup_idle_insn) | |
875 | jhe 1f | |
27f6b416 MS |
876 | mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) |
877 | mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r3) | |
878 | 1: # account system time going idle | |
4c1051e3 | 879 | lm %r9,%r10,__LC_STEAL_TIMER |
27f6b416 | 880 | ADD64 %r9,%r10,__CLOCK_IDLE_ENTER(%r2) |
4c1051e3 MS |
881 | SUB64 %r9,%r10,__LC_LAST_UPDATE_CLOCK |
882 | stm %r9,%r10,__LC_STEAL_TIMER | |
27f6b416 | 883 | mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) |
4c1051e3 MS |
884 | lm %r9,%r10,__LC_SYSTEM_TIMER |
885 | ADD64 %r9,%r10,__LC_LAST_UPDATE_TIMER | |
27f6b416 | 886 | SUB64 %r9,%r10,__TIMER_IDLE_ENTER(%r2) |
4c1051e3 | 887 | stm %r9,%r10,__LC_SYSTEM_TIMER |
27f6b416 | 888 | mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) |
4c1051e3 | 889 | # prepare return psw |
0587d409 | 890 | n %r8,BASED(cleanup_idle_wait) # clear irq & wait state bits |
4c1051e3 MS |
891 | l %r9,24(%r11) # return from psw_idle |
892 | br %r14 | |
893 | cleanup_idle_insn: | |
894 | .long psw_idle_lpsw + 0x80000000 | |
895 | cleanup_idle_wait: | |
0587d409 | 896 | .long 0xfcfdffff |
4c1051e3 | 897 | |
1da177e4 LT |
898 | /* |
899 | * Integer constants | |
900 | */ | |
c5328901 | 901 | .align 4 |
4c1051e3 MS |
902 | .Lnr_syscalls: |
903 | .long NR_syscalls | |
904 | .Lvtimer_max: | |
905 | .quad 0x7fffffffffffffff | |
1da177e4 LT |
906 | |
907 | /* | |
908 | * Symbol constants | |
909 | */ | |
c5328901 MS |
910 | .Ldo_machine_check: .long s390_do_machine_check |
911 | .Lhandle_mcck: .long s390_handle_mcck | |
912 | .Ldo_IRQ: .long do_IRQ | |
c5328901 MS |
913 | .Ldo_signal: .long do_signal |
914 | .Ldo_notify_resume: .long do_notify_resume | |
915 | .Ldo_per_trap: .long do_per_trap | |
c5328901 MS |
916 | .Ljump_table: .long pgm_check_table |
917 | .Lschedule: .long schedule | |
ab1809b4 | 918 | #ifdef CONFIG_PREEMPT |
c5328901 | 919 | .Lpreempt_irq: .long preempt_schedule_irq |
ab1809b4 | 920 | #endif |
c5328901 MS |
921 | .Ltrace_enter: .long do_syscall_trace_enter |
922 | .Ltrace_exit: .long do_syscall_trace_exit | |
923 | .Lschedule_tail: .long schedule_tail | |
c5328901 | 924 | .Lsysc_per: .long sysc_per + 0x80000000 |
1f194a4c | 925 | #ifdef CONFIG_TRACE_IRQFLAGS |
c5328901 MS |
926 | .Lhardirqs_on: .long trace_hardirqs_on_caller |
927 | .Lhardirqs_off: .long trace_hardirqs_off_caller | |
af4c6874 HC |
928 | #endif |
929 | #ifdef CONFIG_LOCKDEP | |
c5328901 | 930 | .Llockdep_sys_exit: .long lockdep_sys_exit |
1f194a4c | 931 | #endif |
c5328901 MS |
932 | .Lcritical_start: .long __critical_start + 0x80000000 |
933 | .Lcritical_length: .long __critical_end - __critical_start | |
1da177e4 | 934 | |
25d83cbf | 935 | .section .rodata, "a" |
1da177e4 | 936 | #define SYSCALL(esa,esame,emu) .long esa |
9bf1226b | 937 | .globl sys_call_table |
1da177e4 LT |
938 | sys_call_table: |
939 | #include "syscalls.S" | |
940 | #undef SYSCALL |