Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/entry.S | |
3 | * S390 low-level entry points. | |
4 | * | |
8b646bd7 | 5 | * Copyright (C) IBM Corp. 1999,2012 |
1da177e4 | 6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
25d83cbf HC |
7 | * Hartmut Penner (hp@de.ibm.com), |
8 | * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), | |
77fa2245 | 9 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
1da177e4 LT |
10 | */ |
11 | ||
2bc89b5e | 12 | #include <linux/init.h> |
144d634a | 13 | #include <linux/linkage.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 + 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 | |
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 | |
101 | j 2f | |
102 | 1: l %r15,\stack # load target stack | |
103 | 2: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
104 | 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 MS |
153 | lr %r15,%r5 |
154 | ahi %r15,STACK_SIZE # end of kernel stack of next | |
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 | |
182 | ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
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 |
aa33c8cb | 192 | lh %r8,__PT_INT_CODE+2(%r11) |
c5328901 MS |
193 | sla %r8,2 # shift and test for svc0 |
194 | jnz sysc_nr_ok | |
1da177e4 LT |
195 | # svc 0: system call number in %r1 |
196 | cl %r1,BASED(.Lnr_syscalls) | |
c5328901 | 197 | jnl sysc_nr_ok |
aa33c8cb | 198 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 MS |
199 | lr %r8,%r1 |
200 | sla %r8,2 | |
1da177e4 | 201 | sysc_nr_ok: |
c5328901 MS |
202 | l %r10,BASED(.Lsys_call_table) # 31 bit system call table |
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 |
1de3447a | 235 | tm __TI_flags+3(%r12),_TIF_SIGPENDING |
c5328901 | 236 | jo sysc_sigpending |
1de3447a | 237 | tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME |
c5328901 | 238 | jo sysc_notify_resume |
5e9a2692 | 239 | tm __TI_flags+3(%r12),_TIF_PER_TRAP |
c5328901 MS |
240 | jo sysc_singlestep |
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: |
5e9a2692 | 263 | ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP |
c5328901 | 264 | lr %r2,%r11 # pass pointer to pt_regs |
25d83cbf HC |
265 | l %r1,BASED(.Ldo_signal) |
266 | basr %r14,%r1 # call do_signal | |
b6ef5bb3 | 267 | tm __TI_flags+3(%r12),_TIF_SYSCALL |
c5328901 MS |
268 | jno sysc_return |
269 | lm %r2,%r7,__PT_R2(%r11) # load svc arguments | |
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: | |
b6ef5bb3 | 290 | ni __TI_flags+3(%r12),255-(_TIF_SYSCALL | _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 |
c5328901 MS |
334 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? |
335 | jo 0f | |
336 | st %r15,__PT_R15(%r11) # store stack pointer for new kthread | |
337 | 0: l %r1,BASED(.Lschedule_tail) | |
338 | basr %r14,%r1 # call schedule_tail | |
1f194a4c | 339 | TRACE_IRQS_ON |
c5328901 MS |
340 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
341 | j sysc_tracenogo | |
1da177e4 LT |
342 | |
343 | # | |
03ff9a23 MS |
344 | # kernel_execve function needs to deal with pt_regs that is not |
345 | # at the usual place | |
1da177e4 | 346 | # |
144d634a | 347 | ENTRY(kernel_execve) |
03ff9a23 MS |
348 | stm %r12,%r15,48(%r15) |
349 | lr %r14,%r15 | |
350 | l %r13,__LC_SVC_NEW_PSW+4 | |
c5328901 | 351 | ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
03ff9a23 | 352 | st %r14,__SF_BACKCHAIN(%r15) |
c5328901 | 353 | la %r12,STACK_FRAME_OVERHEAD(%r15) |
03ff9a23 MS |
354 | xc 0(__PT_SIZE,%r12),0(%r12) |
355 | l %r1,BASED(.Ldo_execve) | |
356 | lr %r5,%r12 | |
c5328901 | 357 | basr %r14,%r1 # call do_execve |
03ff9a23 | 358 | ltr %r2,%r2 |
c5328901 MS |
359 | je 0f |
360 | ahi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
03ff9a23 MS |
361 | lm %r12,%r15,48(%r15) |
362 | br %r14 | |
363 | # execve succeeded. | |
c5328901 | 364 | 0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
03ff9a23 | 365 | l %r15,__LC_KERNEL_STACK # load ksp |
c5328901 MS |
366 | ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
367 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
368 | mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs | |
1de3447a | 369 | l %r12,__LC_THREAD_INFO |
03ff9a23 | 370 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) |
c5328901 | 371 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
03ff9a23 | 372 | l %r1,BASED(.Lexecve_tail) |
c5328901 MS |
373 | basr %r14,%r1 # call execve_tail |
374 | j sysc_return | |
1da177e4 LT |
375 | |
376 | /* | |
377 | * Program check handler routine | |
378 | */ | |
379 | ||
144d634a | 380 | ENTRY(pgm_check_handler) |
c185b783 | 381 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
382 | stm %r8,%r15,__LC_SAVE_AREA_SYNC |
383 | l %r12,__LC_THREAD_INFO | |
384 | l %r13,__LC_SVC_NEW_PSW+4 | |
385 | lm %r8,%r9,__LC_PGM_OLD_PSW | |
386 | tmh %r8,0x0001 # test problem state bit | |
387 | jnz 1f # -> fault in user space | |
388 | tmh %r8,0x4000 # PER bit set in old PSW ? | |
389 | jnz 0f # -> enabled, can't be a double fault | |
390 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
391 | jnz pgm_svcper # -> single stepped svc | |
392 | 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC | |
393 | j 2f | |
394 | 1: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER | |
395 | l %r15,__LC_KERNEL_STACK | |
396 | 2: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
397 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
398 | stm %r0,%r7,__PT_R0(%r11) | |
399 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC | |
400 | stm %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
401 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
402 | mvc __PT_INT_PARM_LONG(4,%r11),__LC_TRANS_EXC_CODE | |
c5328901 MS |
403 | tm __LC_PGM_ILC+3,0x80 # check for per exception |
404 | jz 0f | |
1de3447a | 405 | l %r1,__TI_task(%r12) |
c5328901 MS |
406 | tmh %r8,0x0001 # kernel per event ? |
407 | jz pgm_kprobe | |
408 | oi __TI_flags+3(%r12),_TIF_PER_TRAP | |
5e9a2692 | 409 | mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS |
c5328901 | 410 | mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE |
5e9a2692 | 411 | mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID |
aa33c8cb | 412 | 0: REENABLE_IRQS |
c5328901 | 413 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) |
1de3447a | 414 | l %r1,BASED(.Ljump_table) |
c5328901 | 415 | la %r10,0x7f |
aa33c8cb | 416 | n %r10,__PT_INT_CODE(%r11) |
c5328901 MS |
417 | je sysc_return |
418 | sll %r10,2 | |
419 | l %r1,0(%r10,%r1) # load address of handler routine | |
420 | lr %r2,%r11 # pass pointer to pt_regs | |
1de3447a | 421 | basr %r14,%r1 # branch to interrupt-handler |
c5328901 | 422 | j sysc_return |
1da177e4 LT |
423 | |
424 | # | |
c5328901 | 425 | # PER event in supervisor state, must be kprobes |
1da177e4 | 426 | # |
c5328901 MS |
427 | pgm_kprobe: |
428 | REENABLE_IRQS | |
429 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
430 | l %r1,BASED(.Ldo_per_trap) | |
431 | lr %r2,%r11 # pass pointer to pt_regs | |
432 | basr %r14,%r1 # call do_per_trap | |
433 | j sysc_return | |
1da177e4 | 434 | |
4ba069b8 | 435 | # |
c5328901 | 436 | # single stepped system call |
4ba069b8 | 437 | # |
c5328901 MS |
438 | pgm_svcper: |
439 | oi __TI_flags+3(%r12),_TIF_PER_TRAP | |
440 | mvc __LC_RETURN_PSW(4),__LC_SVC_NEW_PSW | |
441 | mvc __LC_RETURN_PSW+4(4),BASED(.Lsysc_per) | |
442 | lpsw __LC_RETURN_PSW # branch to sysc_per and enable irqs | |
4ba069b8 | 443 | |
1da177e4 LT |
444 | /* |
445 | * IO interrupt handler routine | |
446 | */ | |
447 | ||
144d634a | 448 | ENTRY(io_int_handler) |
1da177e4 | 449 | stck __LC_INT_CLOCK |
9cfb9b3c | 450 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
451 | stm %r8,%r15,__LC_SAVE_AREA_ASYNC |
452 | l %r12,__LC_THREAD_INFO | |
453 | l %r13,__LC_SVC_NEW_PSW+4 | |
454 | lm %r8,%r9,__LC_IO_OLD_PSW | |
455 | tmh %r8,0x0001 # interrupting from user ? | |
456 | jz io_skip | |
457 | UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER | |
458 | io_skip: | |
459 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
460 | stm %r0,%r7,__PT_R0(%r11) | |
461 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC | |
462 | stm %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 463 | TRACE_IRQS_OFF |
c5328901 MS |
464 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) |
465 | l %r1,BASED(.Ldo_IRQ) | |
466 | lr %r2,%r11 # pass pointer to pt_regs | |
467 | basr %r14,%r1 # call do_IRQ | |
1da177e4 | 468 | io_return: |
6a2df3a8 MS |
469 | LOCKDEP_SYS_EXIT |
470 | TRACE_IRQS_ON | |
471 | io_tif: | |
1de3447a | 472 | tm __TI_flags+3(%r12),_TIF_WORK_INT |
c5328901 | 473 | jnz io_work # there is work to do (signals etc.) |
411788ea | 474 | io_restore: |
c5328901 | 475 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) |
c5328901 MS |
476 | stpt __LC_EXIT_TIMER |
477 | lm %r0,%r15,__PT_R0(%r11) | |
478 | lpsw __LC_RETURN_PSW | |
ae6aa2ea | 479 | io_done: |
1da177e4 | 480 | |
2688905e | 481 | # |
43d399d2 MS |
482 | # There is work todo, find out in which context we have been interrupted: |
483 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
484 | # 2) if we return to kernel code and preemptive scheduling is enabled check | |
485 | # the preemption counter and if it is zero call preempt_schedule_irq | |
486 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
487 | # |
488 | io_work: | |
c5328901 MS |
489 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
490 | jo io_work_user # yes -> do resched & signal | |
43d399d2 | 491 | #ifdef CONFIG_PREEMPT |
2688905e | 492 | # check for preemptive scheduling |
1de3447a | 493 | icm %r0,15,__TI_precount(%r12) |
c5328901 | 494 | jnz io_restore # preemption disabled |
1de3447a | 495 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
c5328901 | 496 | jno io_restore |
43d399d2 | 497 | # switch to kernel stack |
c5328901 MS |
498 | l %r1,__PT_R15(%r11) |
499 | ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
500 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
501 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) | |
502 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 503 | lr %r15,%r1 |
6a2df3a8 MS |
504 | # TRACE_IRQS_ON already done at io_return, call |
505 | # TRACE_IRQS_OFF to keep things symmetrical | |
506 | TRACE_IRQS_OFF | |
c5328901 | 507 | l %r1,BASED(.Lpreempt_irq) |
6a2df3a8 | 508 | basr %r14,%r1 # call preempt_schedule_irq |
c5328901 | 509 | j io_return |
6a2df3a8 | 510 | #else |
c5328901 | 511 | j io_restore |
6a2df3a8 | 512 | #endif |
1da177e4 | 513 | |
43d399d2 MS |
514 | # |
515 | # Need to do work before returning to userspace, switch to kernel stack | |
516 | # | |
2688905e | 517 | io_work_user: |
1da177e4 | 518 | l %r1,__LC_KERNEL_STACK |
c5328901 MS |
519 | ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
520 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
521 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) | |
522 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 523 | lr %r15,%r1 |
6a2df3a8 | 524 | |
1da177e4 LT |
525 | # |
526 | # One of the work bits is on. Find out which one. | |
43d399d2 | 527 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
25d83cbf | 528 | # and _TIF_MCCK_PENDING |
1da177e4 | 529 | # |
6a2df3a8 | 530 | io_work_tif: |
1de3447a | 531 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
c5328901 | 532 | jo io_mcck_pending |
1de3447a | 533 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
c5328901 | 534 | jo io_reschedule |
1de3447a | 535 | tm __TI_flags+3(%r12),_TIF_SIGPENDING |
c5328901 | 536 | jo io_sigpending |
1de3447a | 537 | tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME |
c5328901 MS |
538 | jo io_notify_resume |
539 | j io_return # beware of critical section cleanup | |
1da177e4 | 540 | |
77fa2245 HC |
541 | # |
542 | # _TIF_MCCK_PENDING is set, call handler | |
543 | # | |
544 | io_mcck_pending: | |
6a2df3a8 | 545 | # TRACE_IRQS_ON already done at io_return |
c5328901 | 546 | l %r1,BASED(.Lhandle_mcck) |
b771aeac | 547 | basr %r14,%r1 # TIF bit will be cleared by handler |
6a2df3a8 | 548 | TRACE_IRQS_OFF |
c5328901 | 549 | j io_return |
77fa2245 | 550 | |
1da177e4 LT |
551 | # |
552 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
553 | # |
554 | io_reschedule: | |
6a2df3a8 | 555 | # TRACE_IRQS_ON already done at io_return |
25d83cbf | 556 | l %r1,BASED(.Lschedule) |
c5328901 | 557 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 558 | basr %r14,%r1 # call scheduler |
c5328901 | 559 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 560 | TRACE_IRQS_OFF |
c5328901 | 561 | j io_return |
1da177e4 LT |
562 | |
563 | # | |
02a029b3 | 564 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 565 | # |
25d83cbf | 566 | io_sigpending: |
6a2df3a8 | 567 | # TRACE_IRQS_ON already done at io_return |
25d83cbf | 568 | l %r1,BASED(.Ldo_signal) |
c5328901 MS |
569 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
570 | lr %r2,%r11 # pass pointer to pt_regs | |
25d83cbf | 571 | basr %r14,%r1 # call do_signal |
c5328901 | 572 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 573 | TRACE_IRQS_OFF |
c5328901 | 574 | j io_return |
1da177e4 | 575 | |
753c4dd6 MS |
576 | # |
577 | # _TIF_SIGPENDING is set, call do_signal | |
578 | # | |
579 | io_notify_resume: | |
6a2df3a8 | 580 | # TRACE_IRQS_ON already done at io_return |
753c4dd6 | 581 | l %r1,BASED(.Ldo_notify_resume) |
c5328901 MS |
582 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
583 | lr %r2,%r11 # pass pointer to pt_regs | |
584 | basr %r14,%r1 # call do_notify_resume | |
585 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 586 | TRACE_IRQS_OFF |
c5328901 | 587 | j io_return |
753c4dd6 | 588 | |
1da177e4 LT |
589 | /* |
590 | * External interrupt handler routine | |
591 | */ | |
592 | ||
144d634a | 593 | ENTRY(ext_int_handler) |
1da177e4 | 594 | stck __LC_INT_CLOCK |
9cfb9b3c | 595 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
596 | stm %r8,%r15,__LC_SAVE_AREA_ASYNC |
597 | l %r12,__LC_THREAD_INFO | |
598 | l %r13,__LC_SVC_NEW_PSW+4 | |
599 | lm %r8,%r9,__LC_EXT_OLD_PSW | |
600 | tmh %r8,0x0001 # interrupting from user ? | |
601 | jz ext_skip | |
602 | UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER | |
603 | ext_skip: | |
604 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
605 | stm %r0,%r7,__PT_R0(%r11) | |
606 | mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC | |
607 | stm %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 608 | TRACE_IRQS_OFF |
c5328901 | 609 | lr %r2,%r11 # pass pointer to pt_regs |
7e180bd8 | 610 | l %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code |
f6649a7e | 611 | l %r4,__LC_EXT_PARAMS # get external parameters |
1da177e4 | 612 | l %r1,BASED(.Ldo_extint) |
c5328901 MS |
613 | basr %r14,%r1 # call do_extint |
614 | j io_return | |
1da177e4 | 615 | |
4c1051e3 MS |
616 | /* |
617 | * Load idle PSW. The second "half" of this function is in cleanup_idle. | |
618 | */ | |
619 | ENTRY(psw_idle) | |
620 | st %r4,__SF_EMPTY(%r15) | |
621 | basr %r1,0 | |
622 | la %r1,psw_idle_lpsw+4-.(%r1) | |
623 | st %r1,__SF_EMPTY+4(%r15) | |
624 | oi __SF_EMPTY+4(%r15),0x80 | |
625 | la %r1,.Lvtimer_max-psw_idle_lpsw-4(%r1) | |
626 | stck __IDLE_ENTER(%r2) | |
627 | ltr %r5,%r5 | |
628 | stpt __VQ_IDLE_ENTER(%r3) | |
629 | jz psw_idle_lpsw | |
630 | spt 0(%r1) | |
631 | psw_idle_lpsw: | |
632 | lpsw __SF_EMPTY(%r15) | |
633 | br %r14 | |
634 | psw_idle_end: | |
635 | ||
ae6aa2ea MS |
636 | __critical_end: |
637 | ||
1da177e4 LT |
638 | /* |
639 | * Machine check handler routines | |
640 | */ | |
641 | ||
144d634a | 642 | ENTRY(mcck_int_handler) |
6377981f | 643 | stck __LC_MCCK_CLOCK |
77fa2245 HC |
644 | spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer |
645 | lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs | |
c5328901 MS |
646 | l %r12,__LC_THREAD_INFO |
647 | l %r13,__LC_SVC_NEW_PSW+4 | |
648 | lm %r8,%r9,__LC_MCK_OLD_PSW | |
25d83cbf | 649 | tm __LC_MCCK_CODE,0x80 # system damage? |
c5328901 MS |
650 | jo mcck_panic # yes -> rest of mcck code invalid |
651 | la %r14,__LC_CPU_TIMER_SAVE_AREA | |
652 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
63b12246 | 653 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
c5328901 | 654 | jo 3f |
63b12246 MS |
655 | la %r14,__LC_SYNC_ENTER_TIMER |
656 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
c5328901 | 657 | jl 0f |
63b12246 MS |
658 | la %r14,__LC_ASYNC_ENTER_TIMER |
659 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 660 | jl 1f |
63b12246 | 661 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
662 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
663 | jl 2f | |
63b12246 | 664 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 665 | 2: spt 0(%r14) |
6377981f | 666 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c5328901 MS |
667 | 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
668 | jno mcck_panic # no -> skip cleanup critical | |
669 | tm %r8,0x0001 # interrupting from user ? | |
670 | jz mcck_skip | |
671 | UPDATE_VTIME %r14,%r15,__LC_MCCK_ENTER_TIMER | |
672 | mcck_skip: | |
673 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+32,__LC_PANIC_STACK,PAGE_SHIFT | |
674 | mvc __PT_R0(64,%r11),__LC_GPREGS_SAVE_AREA | |
675 | stm %r8,%r9,__PT_PSW(%r11) | |
676 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
677 | l %r1,BASED(.Ldo_machine_check) | |
678 | lr %r2,%r11 # pass pointer to pt_regs | |
679 | basr %r14,%r1 # call s390_do_machine_check | |
680 | tm __PT_PSW+1(%r11),0x01 # returning to user ? | |
681 | jno mcck_return | |
25d83cbf | 682 | l %r1,__LC_KERNEL_STACK # switch to kernel stack |
c5328901 MS |
683 | ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
684 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
685 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) | |
686 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
77fa2245 | 687 | lr %r15,%r1 |
c5328901 | 688 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
1de3447a | 689 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
c5328901 | 690 | jno mcck_return |
1f194a4c | 691 | TRACE_IRQS_OFF |
c5328901 MS |
692 | l %r1,BASED(.Lhandle_mcck) |
693 | basr %r14,%r1 # call s390_handle_mcck | |
1f194a4c | 694 | TRACE_IRQS_ON |
1da177e4 | 695 | mcck_return: |
c5328901 | 696 | mvc __LC_RETURN_MCCK_PSW(8),__PT_PSW(%r11) # move return PSW |
63b12246 | 697 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
c5328901 MS |
698 | jno 0f |
699 | lm %r0,%r15,__PT_R0(%r11) | |
63b12246 | 700 | stpt __LC_EXIT_TIMER |
c5328901 MS |
701 | lpsw __LC_RETURN_MCCK_PSW |
702 | 0: lm %r0,%r15,__PT_R0(%r11) | |
703 | lpsw __LC_RETURN_MCCK_PSW | |
63b12246 | 704 | |
c5328901 MS |
705 | mcck_panic: |
706 | l %r14,__LC_PANIC_STACK | |
707 | slr %r14,%r15 | |
708 | sra %r14,PAGE_SHIFT | |
709 | jz 0f | |
710 | l %r15,__LC_PANIC_STACK | |
711 | 0: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
712 | j mcck_skip | |
1da177e4 | 713 | |
7dd6b334 MH |
714 | # |
715 | # PSW restart interrupt handler | |
716 | # | |
8b646bd7 | 717 | ENTRY(restart_int_handler) |
c5328901 | 718 | st %r15,__LC_SAVE_AREA_RESTART |
8b646bd7 | 719 | l %r15,__LC_RESTART_STACK |
c5328901 | 720 | ahi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 721 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
722 | stm %r0,%r14,__PT_R0(%r15) |
723 | mvc __PT_R15(4,%r15),__LC_SAVE_AREA_RESTART | |
724 | mvc __PT_PSW(8,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
725 | ahi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
726 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
727 | l %r1,__LC_RESTART_FN # load fn, parm & source cpu |
728 | l %r2,__LC_RESTART_DATA | |
729 | l %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
730 | ltr %r3,%r3 # test source cpu address |
731 | jm 1f # negative -> skip source stop | |
eb546195 | 732 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
733 | brc 10,0b # wait for status stored |
734 | 1: basr %r14,%r1 # call function | |
735 | stap __SF_EMPTY(%r15) # store cpu address | |
736 | lh %r3,__SF_EMPTY(%r15) | |
eb546195 | 737 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
738 | brc 2,2b |
739 | 3: j 3b | |
7dd6b334 | 740 | |
860dba45 MS |
741 | .section .kprobes.text, "ax" |
742 | ||
1da177e4 LT |
743 | #ifdef CONFIG_CHECK_STACK |
744 | /* | |
745 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
746 | * No need to properly save the registers, we are going to panic anyway. | |
747 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
748 | */ | |
749 | stack_overflow: | |
750 | l %r15,__LC_PANIC_STACK # change to panic stack | |
c5328901 MS |
751 | ahi %r15,-__PT_SIZE # create pt_regs |
752 | stm %r0,%r7,__PT_R0(%r15) | |
753 | stm %r8,%r9,__PT_PSW(%r15) | |
754 | mvc __PT_R8(32,%r11),0(%r14) | |
755 | lr %r15,%r11 | |
756 | ahi %r15,-STACK_FRAME_OVERHEAD | |
757 | l %r1,BASED(1f) | |
758 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
759 | lr %r2,%r11 # pass pointer to pt_regs | |
760 | br %r1 # branch to kernel_stack_overflow | |
25d83cbf | 761 | 1: .long kernel_stack_overflow |
1da177e4 LT |
762 | #endif |
763 | ||
c5328901 MS |
764 | cleanup_table: |
765 | .long system_call + 0x80000000 | |
766 | .long sysc_do_svc + 0x80000000 | |
767 | .long sysc_tif + 0x80000000 | |
768 | .long sysc_restore + 0x80000000 | |
769 | .long sysc_done + 0x80000000 | |
770 | .long io_tif + 0x80000000 | |
771 | .long io_restore + 0x80000000 | |
772 | .long io_done + 0x80000000 | |
4c1051e3 MS |
773 | .long psw_idle + 0x80000000 |
774 | .long psw_idle_end + 0x80000000 | |
1da177e4 LT |
775 | |
776 | cleanup_critical: | |
c5328901 MS |
777 | cl %r9,BASED(cleanup_table) # system_call |
778 | jl 0f | |
779 | cl %r9,BASED(cleanup_table+4) # sysc_do_svc | |
780 | jl cleanup_system_call | |
781 | cl %r9,BASED(cleanup_table+8) # sysc_tif | |
782 | jl 0f | |
783 | cl %r9,BASED(cleanup_table+12) # sysc_restore | |
784 | jl cleanup_sysc_tif | |
785 | cl %r9,BASED(cleanup_table+16) # sysc_done | |
786 | jl cleanup_sysc_restore | |
787 | cl %r9,BASED(cleanup_table+20) # io_tif | |
788 | jl 0f | |
789 | cl %r9,BASED(cleanup_table+24) # io_restore | |
790 | jl cleanup_io_tif | |
791 | cl %r9,BASED(cleanup_table+28) # io_done | |
792 | jl cleanup_io_restore | |
4c1051e3 MS |
793 | cl %r9,BASED(cleanup_table+32) # psw_idle |
794 | jl 0f | |
795 | cl %r9,BASED(cleanup_table+36) # psw_idle_end | |
796 | jl cleanup_idle | |
c5328901 | 797 | 0: br %r14 |
1da177e4 LT |
798 | |
799 | cleanup_system_call: | |
c5328901 MS |
800 | # check if stpt has been executed |
801 | cl %r9,BASED(cleanup_system_call_insn) | |
802 | jh 0f | |
1da177e4 | 803 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER |
c5328901 MS |
804 | chi %r11,__LC_SAVE_AREA_ASYNC |
805 | je 0f | |
806 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER | |
807 | 0: # check if stm has been executed | |
808 | cl %r9,BASED(cleanup_system_call_insn+4) | |
809 | jh 0f | |
810 | mvc __LC_SAVE_AREA_SYNC(32),0(%r11) | |
811 | 0: # set up saved registers r12, and r13 | |
812 | st %r12,16(%r11) # r12 thread-info pointer | |
813 | st %r13,20(%r11) # r13 literal-pool pointer | |
814 | # check if the user time calculation has been done | |
815 | cl %r9,BASED(cleanup_system_call_insn+8) | |
816 | jh 0f | |
817 | l %r10,__LC_EXIT_TIMER | |
818 | l %r15,__LC_EXIT_TIMER+4 | |
819 | SUB64 %r10,%r15,__LC_SYNC_ENTER_TIMER | |
820 | ADD64 %r10,%r15,__LC_USER_TIMER | |
821 | st %r10,__LC_USER_TIMER | |
822 | st %r15,__LC_USER_TIMER+4 | |
823 | 0: # check if the system time calculation has been done | |
824 | cl %r9,BASED(cleanup_system_call_insn+12) | |
825 | jh 0f | |
826 | l %r10,__LC_LAST_UPDATE_TIMER | |
827 | l %r15,__LC_LAST_UPDATE_TIMER+4 | |
828 | SUB64 %r10,%r15,__LC_EXIT_TIMER | |
829 | ADD64 %r10,%r15,__LC_SYSTEM_TIMER | |
830 | st %r10,__LC_SYSTEM_TIMER | |
831 | st %r15,__LC_SYSTEM_TIMER+4 | |
832 | 0: # update accounting time stamp | |
1da177e4 | 833 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
c5328901 MS |
834 | # set up saved register 11 |
835 | l %r15,__LC_KERNEL_STACK | |
836 | ahi %r15,-__PT_SIZE | |
837 | st %r15,12(%r11) # r11 pt_regs pointer | |
838 | # fill pt_regs | |
839 | mvc __PT_R8(32,%r15),__LC_SAVE_AREA_SYNC | |
840 | stm %r0,%r7,__PT_R0(%r15) | |
841 | mvc __PT_PSW(8,%r15),__LC_SVC_OLD_PSW | |
aa33c8cb | 842 | mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC |
c5328901 MS |
843 | # setup saved register 15 |
844 | ahi %r15,-STACK_FRAME_OVERHEAD | |
845 | st %r15,28(%r11) # r15 stack pointer | |
846 | # set new psw address and exit | |
847 | l %r9,BASED(cleanup_table+4) # sysc_do_svc + 0x80000000 | |
1da177e4 LT |
848 | br %r14 |
849 | cleanup_system_call_insn: | |
25d83cbf | 850 | .long system_call + 0x80000000 |
c5328901 MS |
851 | .long sysc_stm + 0x80000000 |
852 | .long sysc_vtime + 0x80000000 + 36 | |
853 | .long sysc_vtime + 0x80000000 + 76 | |
1da177e4 | 854 | |
6a2df3a8 | 855 | cleanup_sysc_tif: |
c5328901 | 856 | l %r9,BASED(cleanup_table+8) # sysc_tif + 0x80000000 |
1da177e4 LT |
857 | br %r14 |
858 | ||
6a2df3a8 | 859 | cleanup_sysc_restore: |
c5328901 MS |
860 | cl %r9,BASED(cleanup_sysc_restore_insn) |
861 | jhe 0f | |
862 | l %r9,12(%r11) # get saved pointer to pt_regs | |
863 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) | |
864 | mvc 0(32,%r11),__PT_R8(%r9) | |
865 | lm %r0,%r7,__PT_R0(%r9) | |
866 | 0: lm %r8,%r9,__LC_RETURN_PSW | |
1da177e4 | 867 | br %r14 |
6a2df3a8 | 868 | cleanup_sysc_restore_insn: |
411788ea | 869 | .long sysc_done - 4 + 0x80000000 |
1da177e4 | 870 | |
6a2df3a8 | 871 | cleanup_io_tif: |
c5328901 | 872 | l %r9,BASED(cleanup_table+20) # io_tif + 0x80000000 |
176b1803 MS |
873 | br %r14 |
874 | ||
6a2df3a8 | 875 | cleanup_io_restore: |
c5328901 MS |
876 | cl %r9,BASED(cleanup_io_restore_insn) |
877 | jhe 0f | |
878 | l %r9,12(%r11) # get saved r11 pointer to pt_regs | |
879 | mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) | |
c5328901 MS |
880 | mvc 0(32,%r11),__PT_R8(%r9) |
881 | lm %r0,%r7,__PT_R0(%r9) | |
882 | 0: lm %r8,%r9,__LC_RETURN_PSW | |
ae6aa2ea | 883 | br %r14 |
6a2df3a8 | 884 | cleanup_io_restore_insn: |
411788ea | 885 | .long io_done - 4 + 0x80000000 |
ae6aa2ea | 886 | |
4c1051e3 MS |
887 | cleanup_idle: |
888 | # copy interrupt clock & cpu timer | |
889 | mvc __IDLE_EXIT(8,%r2),__LC_INT_CLOCK | |
890 | mvc __VQ_IDLE_EXIT(8,%r3),__LC_ASYNC_ENTER_TIMER | |
891 | chi %r11,__LC_SAVE_AREA_ASYNC | |
892 | je 0f | |
893 | mvc __IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK | |
894 | mvc __VQ_IDLE_EXIT(8,%r3),__LC_MCCK_ENTER_TIMER | |
895 | 0: # check if stck has been executed | |
896 | cl %r9,BASED(cleanup_idle_insn) | |
897 | jhe 1f | |
898 | mvc __IDLE_ENTER(8,%r2),__IDLE_EXIT(%r2) | |
899 | mvc __VQ_IDLE_ENTER(8,%r3),__VQ_IDLE_EXIT(%r3) | |
900 | j 2f | |
901 | 1: # check if the cpu timer has been reprogrammed | |
902 | ltr %r5,%r5 | |
903 | jz 2f | |
904 | spt __VQ_IDLE_ENTER(%r3) | |
905 | 2: # account system time going idle | |
906 | lm %r9,%r10,__LC_STEAL_TIMER | |
907 | ADD64 %r9,%r10,__IDLE_ENTER(%r2) | |
908 | SUB64 %r9,%r10,__LC_LAST_UPDATE_CLOCK | |
909 | stm %r9,%r10,__LC_STEAL_TIMER | |
910 | mvc __LC_LAST_UPDATE_CLOCK(8),__IDLE_EXIT(%r2) | |
911 | lm %r9,%r10,__LC_SYSTEM_TIMER | |
912 | ADD64 %r9,%r10,__LC_LAST_UPDATE_TIMER | |
913 | SUB64 %r9,%r10,__VQ_IDLE_ENTER(%r3) | |
914 | stm %r9,%r10,__LC_SYSTEM_TIMER | |
915 | mvc __LC_LAST_UPDATE_TIMER(8),__VQ_IDLE_EXIT(%r3) | |
916 | # prepare return psw | |
917 | n %r8,BASED(cleanup_idle_wait) # clear wait state bit | |
918 | l %r9,24(%r11) # return from psw_idle | |
919 | br %r14 | |
920 | cleanup_idle_insn: | |
921 | .long psw_idle_lpsw + 0x80000000 | |
922 | cleanup_idle_wait: | |
923 | .long 0xfffdffff | |
924 | ||
1da177e4 LT |
925 | /* |
926 | * Integer constants | |
927 | */ | |
c5328901 | 928 | .align 4 |
4c1051e3 MS |
929 | .Lnr_syscalls: |
930 | .long NR_syscalls | |
931 | .Lvtimer_max: | |
932 | .quad 0x7fffffffffffffff | |
1da177e4 LT |
933 | |
934 | /* | |
935 | * Symbol constants | |
936 | */ | |
c5328901 MS |
937 | .Ldo_machine_check: .long s390_do_machine_check |
938 | .Lhandle_mcck: .long s390_handle_mcck | |
939 | .Ldo_IRQ: .long do_IRQ | |
940 | .Ldo_extint: .long do_extint | |
941 | .Ldo_signal: .long do_signal | |
942 | .Ldo_notify_resume: .long do_notify_resume | |
943 | .Ldo_per_trap: .long do_per_trap | |
944 | .Ldo_execve: .long do_execve | |
945 | .Lexecve_tail: .long execve_tail | |
946 | .Ljump_table: .long pgm_check_table | |
947 | .Lschedule: .long schedule | |
ab1809b4 | 948 | #ifdef CONFIG_PREEMPT |
c5328901 | 949 | .Lpreempt_irq: .long preempt_schedule_irq |
ab1809b4 | 950 | #endif |
c5328901 MS |
951 | .Ltrace_enter: .long do_syscall_trace_enter |
952 | .Ltrace_exit: .long do_syscall_trace_exit | |
953 | .Lschedule_tail: .long schedule_tail | |
954 | .Lsys_call_table: .long sys_call_table | |
955 | .Lsysc_per: .long sysc_per + 0x80000000 | |
1f194a4c | 956 | #ifdef CONFIG_TRACE_IRQFLAGS |
c5328901 MS |
957 | .Lhardirqs_on: .long trace_hardirqs_on_caller |
958 | .Lhardirqs_off: .long trace_hardirqs_off_caller | |
af4c6874 HC |
959 | #endif |
960 | #ifdef CONFIG_LOCKDEP | |
c5328901 | 961 | .Llockdep_sys_exit: .long lockdep_sys_exit |
1f194a4c | 962 | #endif |
c5328901 MS |
963 | .Lcritical_start: .long __critical_start + 0x80000000 |
964 | .Lcritical_length: .long __critical_end - __critical_start | |
1da177e4 | 965 | |
25d83cbf | 966 | .section .rodata, "a" |
1da177e4 | 967 | #define SYSCALL(esa,esame,emu) .long esa |
9bf1226b | 968 | .globl sys_call_table |
1da177e4 LT |
969 | sys_call_table: |
970 | #include "syscalls.S" | |
971 | #undef SYSCALL |