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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/entry.S | |
3 | * S390 low-level entry points. | |
4 | * | |
54dfe5dd | 5 | * Copyright (C) IBM Corp. 1999,2006 |
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 | ||
12 | #include <linux/sys.h> | |
13 | #include <linux/linkage.h> | |
2bc89b5e | 14 | #include <linux/init.h> |
1da177e4 | 15 | #include <asm/cache.h> |
1da177e4 LT |
16 | #include <asm/errno.h> |
17 | #include <asm/ptrace.h> | |
18 | #include <asm/thread_info.h> | |
0013a854 | 19 | #include <asm/asm-offsets.h> |
1da177e4 LT |
20 | #include <asm/unistd.h> |
21 | #include <asm/page.h> | |
22 | ||
23 | /* | |
24 | * Stack layout for the system_call stack entry. | |
25 | * The first few entries are identical to the user_regs_struct. | |
26 | */ | |
25d83cbf HC |
27 | SP_PTREGS = STACK_FRAME_OVERHEAD |
28 | SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS | |
29 | SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW | |
30 | SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS | |
31 | SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 | |
32 | SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 | |
33 | SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 | |
34 | SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 | |
35 | SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 | |
36 | SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 | |
37 | SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 | |
38 | SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 | |
39 | SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 | |
40 | SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 | |
41 | SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 | |
42 | SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 | |
43 | SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 | |
44 | SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 | |
45 | SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 | |
46 | SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 | |
47 | SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC | |
59da2139 | 48 | SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR |
25d83cbf | 49 | SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE |
1da177e4 | 50 | |
753c4dd6 | 51 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 52 | _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) |
753c4dd6 | 53 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 54 | _TIF_MCCK_PENDING) |
9bf1226b | 55 | _TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ |
66700001 | 56 | _TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8) |
1da177e4 LT |
57 | |
58 | STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER | |
59 | STACK_SIZE = 1 << STACK_SHIFT | |
60 | ||
61 | #define BASED(name) name-system_call(%r13) | |
62 | ||
1f194a4c HC |
63 | #ifdef CONFIG_TRACE_IRQFLAGS |
64 | .macro TRACE_IRQS_ON | |
50bec4ce HC |
65 | basr %r2,%r0 |
66 | l %r1,BASED(.Ltrace_irq_on_caller) | |
1f194a4c HC |
67 | basr %r14,%r1 |
68 | .endm | |
69 | ||
70 | .macro TRACE_IRQS_OFF | |
50bec4ce HC |
71 | basr %r2,%r0 |
72 | l %r1,BASED(.Ltrace_irq_off_caller) | |
1f194a4c HC |
73 | basr %r14,%r1 |
74 | .endm | |
75 | #else | |
76 | #define TRACE_IRQS_ON | |
77 | #define TRACE_IRQS_OFF | |
411788ea HC |
78 | #endif |
79 | ||
80 | #ifdef CONFIG_LOCKDEP | |
81 | .macro LOCKDEP_SYS_EXIT | |
82 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
83 | jz 0f | |
84 | l %r1,BASED(.Llockdep_sys_exit) | |
85 | basr %r14,%r1 | |
86 | 0: | |
87 | .endm | |
88 | #else | |
523b44cf | 89 | #define LOCKDEP_SYS_EXIT |
1f194a4c HC |
90 | #endif |
91 | ||
1da177e4 LT |
92 | /* |
93 | * Register usage in interrupt handlers: | |
94 | * R9 - pointer to current task structure | |
95 | * R13 - pointer to literal pool | |
96 | * R14 - return register for function calls | |
97 | * R15 - kernel stack pointer | |
98 | */ | |
99 | ||
25d83cbf | 100 | .macro UPDATE_VTIME lc_from,lc_to,lc_sum |
1da177e4 LT |
101 | lm %r10,%r11,\lc_from |
102 | sl %r10,\lc_to | |
103 | sl %r11,\lc_to+4 | |
104 | bc 3,BASED(0f) | |
105 | sl %r10,BASED(.Lc_1) | |
106 | 0: al %r10,\lc_sum | |
107 | al %r11,\lc_sum+4 | |
108 | bc 12,BASED(1f) | |
109 | al %r10,BASED(.Lc_1) | |
110 | 1: stm %r10,%r11,\lc_sum | |
111 | .endm | |
1da177e4 LT |
112 | |
113 | .macro SAVE_ALL_BASE savearea | |
114 | stm %r12,%r15,\savearea | |
115 | l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 | |
116 | .endm | |
117 | ||
987ad70a MS |
118 | .macro SAVE_ALL_SVC psworg,savearea |
119 | la %r12,\psworg | |
120 | l %r15,__LC_KERNEL_STACK # problem state -> load ksp | |
121 | .endm | |
122 | ||
63b12246 | 123 | .macro SAVE_ALL_SYNC psworg,savearea |
1da177e4 | 124 | la %r12,\psworg |
1da177e4 LT |
125 | tm \psworg+1,0x01 # test problem state bit |
126 | bz BASED(2f) # skip stack setup save | |
127 | l %r15,__LC_KERNEL_STACK # problem state -> load ksp | |
63b12246 MS |
128 | #ifdef CONFIG_CHECK_STACK |
129 | b BASED(3f) | |
130 | 2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD | |
131 | bz BASED(stack_overflow) | |
132 | 3: | |
133 | #endif | |
134 | 2: | |
135 | .endm | |
136 | ||
137 | .macro SAVE_ALL_ASYNC psworg,savearea | |
138 | la %r12,\psworg | |
1da177e4 LT |
139 | tm \psworg+1,0x01 # test problem state bit |
140 | bnz BASED(1f) # from user -> load async stack | |
141 | clc \psworg+4(4),BASED(.Lcritical_end) | |
142 | bhe BASED(0f) | |
143 | clc \psworg+4(4),BASED(.Lcritical_start) | |
144 | bl BASED(0f) | |
145 | l %r14,BASED(.Lcleanup_critical) | |
146 | basr %r14,%r14 | |
6add9f7f | 147 | tm 1(%r12),0x01 # retest problem state after cleanup |
1da177e4 LT |
148 | bnz BASED(1f) |
149 | 0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? | |
150 | slr %r14,%r15 | |
151 | sra %r14,STACK_SHIFT | |
152 | be BASED(2f) | |
153 | 1: l %r15,__LC_ASYNC_STACK | |
1da177e4 LT |
154 | #ifdef CONFIG_CHECK_STACK |
155 | b BASED(3f) | |
156 | 2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD | |
157 | bz BASED(stack_overflow) | |
158 | 3: | |
159 | #endif | |
77fa2245 HC |
160 | 2: |
161 | .endm | |
162 | ||
25d83cbf | 163 | .macro CREATE_STACK_FRAME psworg,savearea |
77fa2245 | 164 | s %r15,BASED(.Lc_spsize) # make room for registers & psw |
1da177e4 | 165 | mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack |
1da177e4 | 166 | st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 |
86f2552b | 167 | icm %r12,12,__LC_SVC_ILC |
1da177e4 | 168 | stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack |
86f2552b | 169 | st %r12,SP_ILC(%r15) |
1da177e4 LT |
170 | mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack |
171 | la %r12,0 | |
172 | st %r12,__SF_BACKCHAIN(%r15) # clear back chain | |
173 | .endm | |
174 | ||
25d83cbf | 175 | .macro RESTORE_ALL psworg,sync |
ae6aa2ea | 176 | mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore |
1da177e4 | 177 | .if !\sync |
ae6aa2ea | 178 | ni \psworg+1,0xfd # clear wait state bit |
1da177e4 LT |
179 | .endif |
180 | lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user | |
c185b783 | 181 | stpt __LC_EXIT_TIMER |
ae6aa2ea | 182 | lpsw \psworg # back to caller |
1da177e4 LT |
183 | .endm |
184 | ||
1e54622e MS |
185 | .macro REENABLE_IRQS |
186 | mvc __SF_EMPTY(1,%r15),SP_PSW(%r15) | |
187 | ni __SF_EMPTY(%r15),0xbf | |
188 | ssm __SF_EMPTY(%r15) | |
189 | .endm | |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Scheduler resume function, called by switch_to | |
193 | * gpr2 = (task_struct *) prev | |
194 | * gpr3 = (task_struct *) next | |
195 | * Returns: | |
196 | * gpr2 = prev | |
197 | */ | |
25d83cbf | 198 | .globl __switch_to |
1da177e4 | 199 | __switch_to: |
25d83cbf | 200 | basr %r1,0 |
1da177e4 LT |
201 | __switch_to_base: |
202 | tm __THREAD_per(%r3),0xe8 # new process is using per ? | |
203 | bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine | |
25d83cbf HC |
204 | stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff |
205 | clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) | |
206 | be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's | |
207 | lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't | |
1da177e4 | 208 | __switch_to_noper: |
77fa2245 HC |
209 | l %r4,__THREAD_info(%r2) # get thread_info of prev |
210 | tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? | |
211 | bz __switch_to_no_mcck-__switch_to_base(%r1) | |
212 | ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
213 | l %r4,__THREAD_info(%r3) # get thread_info of next | |
214 | oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next | |
215 | __switch_to_no_mcck: | |
25d83cbf | 216 | stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task |
1da177e4 LT |
217 | st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp |
218 | l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp | |
219 | lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task | |
220 | st %r3,__LC_CURRENT # __LC_CURRENT = current task struct | |
221 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
25d83cbf | 222 | l %r3,__THREAD_info(%r3) # load thread_info from task struct |
1da177e4 LT |
223 | st %r3,__LC_THREAD_INFO |
224 | ahi %r3,STACK_SIZE | |
225 | st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack | |
226 | br %r14 | |
227 | ||
228 | __critical_start: | |
229 | /* | |
230 | * SVC interrupt handler routine. System calls are synchronous events and | |
231 | * are executed with interrupts enabled. | |
232 | */ | |
233 | ||
25d83cbf | 234 | .globl system_call |
1da177e4 | 235 | system_call: |
c185b783 | 236 | stpt __LC_SYNC_ENTER_TIMER |
1da177e4 LT |
237 | sysc_saveall: |
238 | SAVE_ALL_BASE __LC_SAVE_AREA | |
987ad70a | 239 | SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 240 | CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
1da177e4 | 241 | lh %r7,0x8a # get svc number from lowcore |
1da177e4 | 242 | sysc_vtime: |
1da177e4 LT |
243 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
244 | sysc_stime: | |
245 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
246 | sysc_update: | |
247 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
248 | sysc_do_svc: |
249 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct | |
59da2139 | 250 | ltr %r7,%r7 # test for svc 0 |
25d83cbf | 251 | bnz BASED(sysc_nr_ok) # svc number > 0 |
1da177e4 LT |
252 | # svc 0: system call number in %r1 |
253 | cl %r1,BASED(.Lnr_syscalls) | |
254 | bnl BASED(sysc_nr_ok) | |
25d83cbf | 255 | lr %r7,%r1 # copy svc number to %r7 |
1da177e4 LT |
256 | sysc_nr_ok: |
257 | mvc SP_ARGS(4,%r15),SP_R7(%r15) | |
258 | sysc_do_restart: | |
59da2139 MS |
259 | sth %r7,SP_SVCNR(%r15) |
260 | sll %r7,2 # svc number *4 | |
d882b172 | 261 | l %r8,BASED(.Lsysc_table) |
bcf5cef7 | 262 | tm __TI_flags+2(%r9),_TIF_SYSCALL |
d882b172 | 263 | l %r8,0(%r7,%r8) # get system call addr. |
25d83cbf HC |
264 | bnz BASED(sysc_tracesys) |
265 | basr %r14,%r8 # call sys_xxxx | |
266 | st %r2,SP_R2(%r15) # store return value (change R2 on stack) | |
1da177e4 LT |
267 | |
268 | sysc_return: | |
6a2df3a8 MS |
269 | LOCKDEP_SYS_EXIT |
270 | sysc_tif: | |
1da177e4 LT |
271 | tm __TI_flags+3(%r9),_TIF_WORK_SVC |
272 | bnz BASED(sysc_work) # there is work to do (signals etc.) | |
411788ea | 273 | sysc_restore: |
25d83cbf | 274 | RESTORE_ALL __LC_RETURN_PSW,1 |
411788ea HC |
275 | sysc_done: |
276 | ||
1da177e4 | 277 | # |
43d399d2 | 278 | # There is work to do, but first we need to check if we return to userspace. |
1da177e4 LT |
279 | # |
280 | sysc_work: | |
2688905e MS |
281 | tm SP_PSW+1(%r15),0x01 # returning to user ? |
282 | bno BASED(sysc_restore) | |
43d399d2 MS |
283 | |
284 | # | |
285 | # One of the work bits is on. Find out which one. | |
286 | # | |
6a2df3a8 | 287 | sysc_work_tif: |
77fa2245 HC |
288 | tm __TI_flags+3(%r9),_TIF_MCCK_PENDING |
289 | bo BASED(sysc_mcck_pending) | |
1da177e4 LT |
290 | tm __TI_flags+3(%r9),_TIF_NEED_RESCHED |
291 | bo BASED(sysc_reschedule) | |
02a029b3 | 292 | tm __TI_flags+3(%r9),_TIF_SIGPENDING |
43d399d2 | 293 | bo BASED(sysc_sigpending) |
753c4dd6 | 294 | tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME |
43d399d2 | 295 | bo BASED(sysc_notify_resume) |
1da177e4 LT |
296 | tm __TI_flags+3(%r9),_TIF_RESTART_SVC |
297 | bo BASED(sysc_restart) | |
298 | tm __TI_flags+3(%r9),_TIF_SINGLE_STEP | |
299 | bo BASED(sysc_singlestep) | |
43d399d2 | 300 | b BASED(sysc_return) # beware of critical section cleanup |
1da177e4 LT |
301 | |
302 | # | |
303 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
304 | # |
305 | sysc_reschedule: | |
306 | l %r1,BASED(.Lschedule) | |
6a2df3a8 | 307 | la %r14,BASED(sysc_return) |
25d83cbf | 308 | br %r1 # call scheduler |
1da177e4 | 309 | |
77fa2245 HC |
310 | # |
311 | # _TIF_MCCK_PENDING is set, call handler | |
312 | # | |
313 | sysc_mcck_pending: | |
314 | l %r1,BASED(.Ls390_handle_mcck) | |
6a2df3a8 | 315 | la %r14,BASED(sysc_return) |
77fa2245 HC |
316 | br %r1 # TIF bit will be cleared by handler |
317 | ||
1da177e4 | 318 | # |
02a029b3 | 319 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 320 | # |
25d83cbf | 321 | sysc_sigpending: |
1da177e4 | 322 | ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP |
25d83cbf HC |
323 | la %r2,SP_PTREGS(%r15) # load pt_regs |
324 | l %r1,BASED(.Ldo_signal) | |
325 | basr %r14,%r1 # call do_signal | |
1da177e4 LT |
326 | tm __TI_flags+3(%r9),_TIF_RESTART_SVC |
327 | bo BASED(sysc_restart) | |
328 | tm __TI_flags+3(%r9),_TIF_SINGLE_STEP | |
329 | bo BASED(sysc_singlestep) | |
6a2df3a8 | 330 | b BASED(sysc_return) |
1da177e4 | 331 | |
753c4dd6 MS |
332 | # |
333 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
334 | # | |
335 | sysc_notify_resume: | |
336 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
337 | l %r1,BASED(.Ldo_notify_resume) | |
6a2df3a8 | 338 | la %r14,BASED(sysc_return) |
753c4dd6 MS |
339 | br %r1 # call do_notify_resume |
340 | ||
341 | ||
1da177e4 LT |
342 | # |
343 | # _TIF_RESTART_SVC is set, set up registers and restart svc | |
344 | # | |
345 | sysc_restart: | |
346 | ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC | |
25d83cbf | 347 | l %r7,SP_R2(%r15) # load new svc number |
1da177e4 | 348 | mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument |
25d83cbf HC |
349 | lm %r2,%r6,SP_R2(%r15) # load svc arguments |
350 | b BASED(sysc_do_restart) # restart svc | |
1da177e4 LT |
351 | |
352 | # | |
353 | # _TIF_SINGLE_STEP is set, call do_single_step | |
354 | # | |
355 | sysc_singlestep: | |
356 | ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP | |
59da2139 MS |
357 | mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check |
358 | mvi SP_SVCNR+1(%r15),0xff | |
1da177e4 LT |
359 | la %r2,SP_PTREGS(%r15) # address of register-save area |
360 | l %r1,BASED(.Lhandle_per) # load adr. of per handler | |
6a2df3a8 | 361 | la %r14,BASED(sysc_return) # load adr. of system return |
1da177e4 LT |
362 | br %r1 # branch to do_single_step |
363 | ||
1da177e4 | 364 | # |
753c4dd6 MS |
365 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
366 | # and after the system call | |
1da177e4 LT |
367 | # |
368 | sysc_tracesys: | |
753c4dd6 | 369 | l %r1,BASED(.Ltrace_entry) |
25d83cbf | 370 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 LT |
371 | la %r3,0 |
372 | srl %r7,2 | |
373 | st %r7,SP_R2(%r15) | |
374 | basr %r14,%r1 | |
753c4dd6 | 375 | cl %r2,BASED(.Lnr_syscalls) |
1da177e4 | 376 | bnl BASED(sysc_tracenogo) |
d882b172 | 377 | l %r8,BASED(.Lsysc_table) |
753c4dd6 | 378 | lr %r7,%r2 |
59da2139 | 379 | sll %r7,2 # svc number *4 |
d882b172 | 380 | l %r8,0(%r7,%r8) |
1da177e4 LT |
381 | sysc_tracego: |
382 | lm %r3,%r6,SP_R3(%r15) | |
383 | l %r2,SP_ORIG_R2(%r15) | |
25d83cbf HC |
384 | basr %r14,%r8 # call sys_xxx |
385 | st %r2,SP_R2(%r15) # store return value | |
1da177e4 | 386 | sysc_tracenogo: |
bcf5cef7 | 387 | tm __TI_flags+2(%r9),_TIF_SYSCALL |
25d83cbf | 388 | bz BASED(sysc_return) |
753c4dd6 | 389 | l %r1,BASED(.Ltrace_exit) |
25d83cbf | 390 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 LT |
391 | la %r14,BASED(sysc_return) |
392 | br %r1 | |
393 | ||
394 | # | |
395 | # a new process exits the kernel with ret_from_fork | |
396 | # | |
25d83cbf | 397 | .globl ret_from_fork |
1da177e4 LT |
398 | ret_from_fork: |
399 | l %r13,__LC_SVC_NEW_PSW+4 | |
400 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct | |
401 | tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? | |
402 | bo BASED(0f) | |
403 | st %r15,SP_R15(%r15) # store stack pointer for new kthread | |
25d83cbf HC |
404 | 0: l %r1,BASED(.Lschedtail) |
405 | basr %r14,%r1 | |
1f194a4c | 406 | TRACE_IRQS_ON |
25d83cbf | 407 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
8f2961c3 | 408 | b BASED(sysc_tracenogo) |
1da177e4 LT |
409 | |
410 | # | |
03ff9a23 MS |
411 | # kernel_execve function needs to deal with pt_regs that is not |
412 | # at the usual place | |
1da177e4 | 413 | # |
03ff9a23 MS |
414 | .globl kernel_execve |
415 | kernel_execve: | |
416 | stm %r12,%r15,48(%r15) | |
417 | lr %r14,%r15 | |
418 | l %r13,__LC_SVC_NEW_PSW+4 | |
419 | s %r15,BASED(.Lc_spsize) | |
420 | st %r14,__SF_BACKCHAIN(%r15) | |
421 | la %r12,SP_PTREGS(%r15) | |
422 | xc 0(__PT_SIZE,%r12),0(%r12) | |
423 | l %r1,BASED(.Ldo_execve) | |
424 | lr %r5,%r12 | |
425 | basr %r14,%r1 | |
426 | ltr %r2,%r2 | |
427 | be BASED(0f) | |
428 | a %r15,BASED(.Lc_spsize) | |
429 | lm %r12,%r15,48(%r15) | |
430 | br %r14 | |
431 | # execve succeeded. | |
432 | 0: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts | |
433 | l %r15,__LC_KERNEL_STACK # load ksp | |
434 | s %r15,BASED(.Lc_spsize) # make room for registers & psw | |
435 | l %r9,__LC_THREAD_INFO | |
436 | mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs | |
437 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
438 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
439 | l %r1,BASED(.Lexecve_tail) | |
440 | basr %r14,%r1 | |
441 | b BASED(sysc_return) | |
1da177e4 LT |
442 | |
443 | /* | |
444 | * Program check handler routine | |
445 | */ | |
446 | ||
25d83cbf | 447 | .globl pgm_check_handler |
1da177e4 LT |
448 | pgm_check_handler: |
449 | /* | |
450 | * First we need to check for a special case: | |
451 | * Single stepping an instruction that disables the PER event mask will | |
452 | * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. | |
453 | * For a single stepped SVC the program check handler gets control after | |
454 | * the SVC new PSW has been loaded. But we want to execute the SVC first and | |
455 | * then handle the PER event. Therefore we update the SVC old PSW to point | |
456 | * to the pgm_check_handler and branch to the SVC handler after we checked | |
457 | * if we have to load the kernel stack register. | |
458 | * For every other possible cause for PER event without the PER mask set | |
459 | * we just ignore the PER event (FIXME: is there anything we have to do | |
460 | * for LPSW?). | |
461 | */ | |
c185b783 | 462 | stpt __LC_SYNC_ENTER_TIMER |
1da177e4 | 463 | SAVE_ALL_BASE __LC_SAVE_AREA |
25d83cbf HC |
464 | tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception |
465 | bnz BASED(pgm_per) # got per exception -> special case | |
63b12246 | 466 | SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 467 | CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
1da177e4 LT |
468 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
469 | bz BASED(pgm_no_vtime) | |
470 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER | |
471 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
472 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
473 | pgm_no_vtime: | |
1da177e4 | 474 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
25d83cbf | 475 | l %r3,__LC_PGM_ILC # load program interruption code |
1e54622e MS |
476 | l %r4,__LC_TRANS_EXC_CODE |
477 | REENABLE_IRQS | |
1da177e4 LT |
478 | la %r8,0x7f |
479 | nr %r8,%r3 | |
480 | pgm_do_call: | |
25d83cbf HC |
481 | l %r7,BASED(.Ljump_table) |
482 | sll %r8,2 | |
483 | l %r7,0(%r8,%r7) # load address of handler routine | |
484 | la %r2,SP_PTREGS(%r15) # address of register-save area | |
6a2df3a8 MS |
485 | basr %r14,%r7 # branch to interrupt-handler |
486 | pgm_exit: | |
6a2df3a8 | 487 | b BASED(sysc_return) |
1da177e4 LT |
488 | |
489 | # | |
490 | # handle per exception | |
491 | # | |
492 | pgm_per: | |
25d83cbf HC |
493 | tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on |
494 | bnz BASED(pgm_per_std) # ok, normal per event from user space | |
1da177e4 | 495 | # ok its one of the special cases, now we need to find out which one |
25d83cbf HC |
496 | clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW |
497 | be BASED(pgm_svcper) | |
1da177e4 | 498 | # no interesting special case, ignore PER event |
25d83cbf HC |
499 | lm %r12,%r15,__LC_SAVE_AREA |
500 | lpsw 0x28 | |
1da177e4 LT |
501 | |
502 | # | |
503 | # Normal per exception | |
504 | # | |
505 | pgm_per_std: | |
63b12246 | 506 | SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 507 | CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
1da177e4 LT |
508 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
509 | bz BASED(pgm_no_vtime2) | |
510 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER | |
511 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
512 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
513 | pgm_no_vtime2: | |
1da177e4 LT |
514 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
515 | l %r1,__TI_task(%r9) | |
6a2df3a8 MS |
516 | tm SP_PSW+1(%r15),0x01 # kernel per event ? |
517 | bz BASED(kernel_per) | |
1da177e4 LT |
518 | mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID |
519 | mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS | |
520 | mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID | |
521 | oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP | |
25d83cbf | 522 | l %r3,__LC_PGM_ILC # load program interruption code |
1e54622e MS |
523 | l %r4,__LC_TRANS_EXC_CODE |
524 | REENABLE_IRQS | |
1da177e4 | 525 | la %r8,0x7f |
25d83cbf | 526 | nr %r8,%r3 # clear per-event-bit and ilc |
f5cdac27 HC |
527 | be BASED(pgm_exit2) # only per or per+check ? |
528 | l %r7,BASED(.Ljump_table) | |
529 | sll %r8,2 | |
530 | l %r7,0(%r8,%r7) # load address of handler routine | |
531 | la %r2,SP_PTREGS(%r15) # address of register-save area | |
532 | basr %r14,%r7 # branch to interrupt-handler | |
533 | pgm_exit2: | |
f5cdac27 | 534 | b BASED(sysc_return) |
1da177e4 LT |
535 | |
536 | # | |
537 | # it was a single stepped SVC that is causing all the trouble | |
538 | # | |
539 | pgm_svcper: | |
63b12246 | 540 | SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 541 | CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
1da177e4 LT |
542 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
543 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
544 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
545 | lh %r7,0x8a # get svc number from lowcore |
546 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct | |
bcc6525f CB |
547 | l %r8,__TI_task(%r9) |
548 | mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID | |
549 | mvc __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS | |
550 | mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID | |
1da177e4 LT |
551 | oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP |
552 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
6a2df3a8 | 553 | lm %r2,%r6,SP_R2(%r15) # load svc arguments |
1da177e4 LT |
554 | b BASED(sysc_do_svc) |
555 | ||
4ba069b8 MG |
556 | # |
557 | # per was called from kernel, must be kprobes | |
558 | # | |
559 | kernel_per: | |
59da2139 MS |
560 | mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check |
561 | mvi SP_SVCNR+1(%r15),0xff | |
4ba069b8 MG |
562 | la %r2,SP_PTREGS(%r15) # address of register-save area |
563 | l %r1,BASED(.Lhandle_per) # load adr. of per handler | |
6a2df3a8 MS |
564 | basr %r14,%r1 # branch to do_single_step |
565 | b BASED(pgm_exit) | |
4ba069b8 | 566 | |
1da177e4 LT |
567 | /* |
568 | * IO interrupt handler routine | |
569 | */ | |
570 | ||
25d83cbf | 571 | .globl io_int_handler |
1da177e4 | 572 | io_int_handler: |
1da177e4 | 573 | stck __LC_INT_CLOCK |
9cfb9b3c | 574 | stpt __LC_ASYNC_ENTER_TIMER |
1da177e4 | 575 | SAVE_ALL_BASE __LC_SAVE_AREA+16 |
63b12246 | 576 | SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 |
77fa2245 | 577 | CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 |
1da177e4 LT |
578 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
579 | bz BASED(io_no_vtime) | |
580 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER | |
581 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
582 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
583 | io_no_vtime: | |
1f194a4c | 584 | TRACE_IRQS_OFF |
6a2df3a8 | 585 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
25d83cbf HC |
586 | l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ |
587 | la %r2,SP_PTREGS(%r15) # address of register-save area | |
588 | basr %r14,%r1 # branch to standard irq handler | |
1da177e4 | 589 | io_return: |
6a2df3a8 MS |
590 | LOCKDEP_SYS_EXIT |
591 | TRACE_IRQS_ON | |
592 | io_tif: | |
1da177e4 | 593 | tm __TI_flags+3(%r9),_TIF_WORK_INT |
25d83cbf | 594 | bnz BASED(io_work) # there is work to do (signals etc.) |
411788ea | 595 | io_restore: |
25d83cbf | 596 | RESTORE_ALL __LC_RETURN_PSW,0 |
ae6aa2ea | 597 | io_done: |
1da177e4 | 598 | |
2688905e | 599 | # |
43d399d2 MS |
600 | # There is work todo, find out in which context we have been interrupted: |
601 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
602 | # 2) if we return to kernel code and preemptive scheduling is enabled check | |
603 | # the preemption counter and if it is zero call preempt_schedule_irq | |
604 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
605 | # |
606 | io_work: | |
607 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
43d399d2 MS |
608 | bo BASED(io_work_user) # yes -> do resched & signal |
609 | #ifdef CONFIG_PREEMPT | |
2688905e | 610 | # check for preemptive scheduling |
1da177e4 | 611 | icm %r0,15,__TI_precount(%r9) |
2688905e | 612 | bnz BASED(io_restore) # preemption disabled |
6a2df3a8 MS |
613 | tm __TI_flags+3(%r9),_TIF_NEED_RESCHED |
614 | bno BASED(io_restore) | |
43d399d2 | 615 | # switch to kernel stack |
1da177e4 LT |
616 | l %r1,SP_R15(%r15) |
617 | s %r1,BASED(.Lc_spsize) | |
618 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 619 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
1da177e4 | 620 | lr %r15,%r1 |
6a2df3a8 MS |
621 | # TRACE_IRQS_ON already done at io_return, call |
622 | # TRACE_IRQS_OFF to keep things symmetrical | |
623 | TRACE_IRQS_OFF | |
b8e7a54c | 624 | l %r1,BASED(.Lpreempt_schedule_irq) |
6a2df3a8 MS |
625 | basr %r14,%r1 # call preempt_schedule_irq |
626 | b BASED(io_return) | |
627 | #else | |
43d399d2 | 628 | b BASED(io_restore) |
6a2df3a8 | 629 | #endif |
1da177e4 | 630 | |
43d399d2 MS |
631 | # |
632 | # Need to do work before returning to userspace, switch to kernel stack | |
633 | # | |
2688905e | 634 | io_work_user: |
1da177e4 LT |
635 | l %r1,__LC_KERNEL_STACK |
636 | s %r1,BASED(.Lc_spsize) | |
637 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 638 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
1da177e4 | 639 | lr %r15,%r1 |
6a2df3a8 | 640 | |
1da177e4 LT |
641 | # |
642 | # One of the work bits is on. Find out which one. | |
43d399d2 | 643 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
25d83cbf | 644 | # and _TIF_MCCK_PENDING |
1da177e4 | 645 | # |
6a2df3a8 | 646 | io_work_tif: |
77fa2245 | 647 | tm __TI_flags+3(%r9),_TIF_MCCK_PENDING |
25d83cbf | 648 | bo BASED(io_mcck_pending) |
1da177e4 LT |
649 | tm __TI_flags+3(%r9),_TIF_NEED_RESCHED |
650 | bo BASED(io_reschedule) | |
02a029b3 | 651 | tm __TI_flags+3(%r9),_TIF_SIGPENDING |
43d399d2 | 652 | bo BASED(io_sigpending) |
753c4dd6 | 653 | tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME |
43d399d2 MS |
654 | bo BASED(io_notify_resume) |
655 | b BASED(io_return) # beware of critical section cleanup | |
1da177e4 | 656 | |
77fa2245 HC |
657 | # |
658 | # _TIF_MCCK_PENDING is set, call handler | |
659 | # | |
660 | io_mcck_pending: | |
6a2df3a8 | 661 | # TRACE_IRQS_ON already done at io_return |
77fa2245 | 662 | l %r1,BASED(.Ls390_handle_mcck) |
b771aeac | 663 | basr %r14,%r1 # TIF bit will be cleared by handler |
6a2df3a8 MS |
664 | TRACE_IRQS_OFF |
665 | b BASED(io_return) | |
77fa2245 | 666 | |
1da177e4 LT |
667 | # |
668 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
669 | # |
670 | io_reschedule: | |
6a2df3a8 | 671 | # TRACE_IRQS_ON already done at io_return |
25d83cbf HC |
672 | l %r1,BASED(.Lschedule) |
673 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
674 | basr %r14,%r1 # call scheduler | |
675 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
411788ea | 676 | TRACE_IRQS_OFF |
6a2df3a8 | 677 | b BASED(io_return) |
1da177e4 LT |
678 | |
679 | # | |
02a029b3 | 680 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 681 | # |
25d83cbf | 682 | io_sigpending: |
6a2df3a8 | 683 | # TRACE_IRQS_ON already done at io_return |
25d83cbf HC |
684 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
685 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
686 | l %r1,BASED(.Ldo_signal) | |
687 | basr %r14,%r1 # call do_signal | |
688 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
411788ea | 689 | TRACE_IRQS_OFF |
6a2df3a8 | 690 | b BASED(io_return) |
1da177e4 | 691 | |
753c4dd6 MS |
692 | # |
693 | # _TIF_SIGPENDING is set, call do_signal | |
694 | # | |
695 | io_notify_resume: | |
6a2df3a8 | 696 | # TRACE_IRQS_ON already done at io_return |
753c4dd6 MS |
697 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
698 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
699 | l %r1,BASED(.Ldo_notify_resume) | |
700 | basr %r14,%r1 # call do_signal | |
701 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
702 | TRACE_IRQS_OFF | |
6a2df3a8 | 703 | b BASED(io_return) |
753c4dd6 | 704 | |
1da177e4 LT |
705 | /* |
706 | * External interrupt handler routine | |
707 | */ | |
708 | ||
25d83cbf | 709 | .globl ext_int_handler |
1da177e4 | 710 | ext_int_handler: |
1da177e4 | 711 | stck __LC_INT_CLOCK |
9cfb9b3c | 712 | stpt __LC_ASYNC_ENTER_TIMER |
1da177e4 | 713 | SAVE_ALL_BASE __LC_SAVE_AREA+16 |
63b12246 | 714 | SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 |
77fa2245 | 715 | CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 |
1da177e4 LT |
716 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
717 | bz BASED(ext_no_vtime) | |
718 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER | |
719 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
720 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
721 | ext_no_vtime: | |
1da177e4 | 722 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
1f194a4c | 723 | TRACE_IRQS_OFF |
25d83cbf HC |
724 | la %r2,SP_PTREGS(%r15) # address of register-save area |
725 | lh %r3,__LC_EXT_INT_CODE # get interruption code | |
1da177e4 LT |
726 | l %r1,BASED(.Ldo_extint) |
727 | basr %r14,%r1 | |
728 | b BASED(io_return) | |
729 | ||
ae6aa2ea MS |
730 | __critical_end: |
731 | ||
1da177e4 LT |
732 | /* |
733 | * Machine check handler routines | |
734 | */ | |
735 | ||
25d83cbf | 736 | .globl mcck_int_handler |
1da177e4 | 737 | mcck_int_handler: |
6377981f | 738 | stck __LC_MCCK_CLOCK |
77fa2245 HC |
739 | spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer |
740 | lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs | |
1da177e4 | 741 | SAVE_ALL_BASE __LC_SAVE_AREA+32 |
77fa2245 | 742 | la %r12,__LC_MCK_OLD_PSW |
25d83cbf | 743 | tm __LC_MCCK_CODE,0x80 # system damage? |
77fa2245 | 744 | bo BASED(mcck_int_main) # yes -> rest of mcck code invalid |
6377981f | 745 | mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA |
63b12246 MS |
746 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
747 | bo BASED(1f) | |
748 | la %r14,__LC_SYNC_ENTER_TIMER | |
749 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
750 | bl BASED(0f) | |
751 | la %r14,__LC_ASYNC_ENTER_TIMER | |
752 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
753 | bl BASED(0f) | |
754 | la %r14,__LC_EXIT_TIMER | |
755 | 0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER | |
756 | bl BASED(0f) | |
757 | la %r14,__LC_LAST_UPDATE_TIMER | |
758 | 0: spt 0(%r14) | |
6377981f | 759 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c185b783 | 760 | 1: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
77fa2245 HC |
761 | bno BASED(mcck_int_main) # no -> skip cleanup critical |
762 | tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit | |
763 | bnz BASED(mcck_int_main) # from user -> load async stack | |
764 | clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) | |
765 | bhe BASED(mcck_int_main) | |
766 | clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) | |
767 | bl BASED(mcck_int_main) | |
768 | l %r14,BASED(.Lcleanup_critical) | |
769 | basr %r14,%r14 | |
770 | mcck_int_main: | |
771 | l %r14,__LC_PANIC_STACK # are we already on the panic stack? | |
772 | slr %r14,%r15 | |
773 | sra %r14,PAGE_SHIFT | |
774 | be BASED(0f) | |
775 | l %r15,__LC_PANIC_STACK # load panic stack | |
776 | 0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 | |
25d83cbf | 777 | tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? |
ae6aa2ea | 778 | bno BASED(mcck_no_vtime) # no -> skip cleanup critical |
63b12246 | 779 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
ae6aa2ea | 780 | bz BASED(mcck_no_vtime) |
6377981f | 781 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER |
ae6aa2ea | 782 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER |
6377981f | 783 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER |
ae6aa2ea | 784 | mcck_no_vtime: |
77fa2245 HC |
785 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
786 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
25d83cbf HC |
787 | l %r1,BASED(.Ls390_mcck) |
788 | basr %r14,%r1 # call machine check handler | |
789 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
77fa2245 | 790 | bno BASED(mcck_return) |
25d83cbf | 791 | l %r1,__LC_KERNEL_STACK # switch to kernel stack |
77fa2245 HC |
792 | s %r1,BASED(.Lc_spsize) |
793 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 794 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
77fa2245 HC |
795 | lr %r15,%r1 |
796 | stosm __SF_EMPTY(%r15),0x04 # turn dat on | |
797 | tm __TI_flags+3(%r9),_TIF_MCCK_PENDING | |
798 | bno BASED(mcck_return) | |
1f194a4c | 799 | TRACE_IRQS_OFF |
77fa2245 HC |
800 | l %r1,BASED(.Ls390_handle_mcck) |
801 | basr %r14,%r1 # call machine check handler | |
1f194a4c | 802 | TRACE_IRQS_ON |
1da177e4 | 803 | mcck_return: |
63b12246 MS |
804 | mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW |
805 | ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit | |
63b12246 MS |
806 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
807 | bno BASED(0f) | |
808 | lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 | |
809 | stpt __LC_EXIT_TIMER | |
810 | lpsw __LC_RETURN_MCCK_PSW # back to caller | |
c185b783 | 811 | 0: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 |
63b12246 MS |
812 | lpsw __LC_RETURN_MCCK_PSW # back to caller |
813 | ||
25d83cbf | 814 | RESTORE_ALL __LC_RETURN_MCCK_PSW,0 |
1da177e4 | 815 | |
1da177e4 LT |
816 | /* |
817 | * Restart interruption handler, kick starter for additional CPUs | |
818 | */ | |
84b36a8e | 819 | #ifdef CONFIG_SMP |
2bc89b5e | 820 | __CPUINIT |
25d83cbf | 821 | .globl restart_int_handler |
1da177e4 | 822 | restart_int_handler: |
5b409ed1 MS |
823 | basr %r1,0 |
824 | restart_base: | |
825 | spt restart_vtime-restart_base(%r1) | |
826 | stck __LC_LAST_UPDATE_CLOCK | |
827 | mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) | |
828 | mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) | |
25d83cbf HC |
829 | l %r15,__LC_SAVE_AREA+60 # load ksp |
830 | lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs | |
831 | lam %a0,%a15,__LC_AREGS_SAVE_AREA | |
832 | lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone | |
5b409ed1 MS |
833 | l %r1,__LC_THREAD_INFO |
834 | mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) | |
835 | mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) | |
836 | xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER | |
25d83cbf HC |
837 | stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on |
838 | basr %r14,0 | |
839 | l %r14,restart_addr-.(%r14) | |
840 | br %r14 # branch to start_secondary | |
1da177e4 | 841 | restart_addr: |
25d83cbf | 842 | .long start_secondary |
5b409ed1 MS |
843 | .align 8 |
844 | restart_vtime: | |
845 | .long 0x7fffffff,0xffffffff | |
84b36a8e | 846 | .previous |
1da177e4 LT |
847 | #else |
848 | /* | |
849 | * If we do not run with SMP enabled, let the new CPU crash ... | |
850 | */ | |
25d83cbf | 851 | .globl restart_int_handler |
1da177e4 | 852 | restart_int_handler: |
25d83cbf | 853 | basr %r1,0 |
1da177e4 | 854 | restart_base: |
25d83cbf HC |
855 | lpsw restart_crash-restart_base(%r1) |
856 | .align 8 | |
1da177e4 | 857 | restart_crash: |
25d83cbf | 858 | .long 0x000a0000,0x00000000 |
1da177e4 LT |
859 | restart_go: |
860 | #endif | |
861 | ||
862 | #ifdef CONFIG_CHECK_STACK | |
863 | /* | |
864 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
865 | * No need to properly save the registers, we are going to panic anyway. | |
866 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
867 | */ | |
868 | stack_overflow: | |
869 | l %r15,__LC_PANIC_STACK # change to panic stack | |
870 | sl %r15,BASED(.Lc_spsize) | |
871 | mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack | |
872 | stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack | |
873 | la %r1,__LC_SAVE_AREA | |
874 | ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? | |
875 | be BASED(0f) | |
876 | ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? | |
877 | be BASED(0f) | |
878 | la %r1,__LC_SAVE_AREA+16 | |
879 | 0: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack | |
25d83cbf | 880 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain |
1da177e4 | 881 | l %r1,BASED(1f) # branch to kernel_stack_overflow |
25d83cbf | 882 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 | 883 | br %r1 |
25d83cbf | 884 | 1: .long kernel_stack_overflow |
1da177e4 LT |
885 | #endif |
886 | ||
887 | cleanup_table_system_call: | |
888 | .long system_call + 0x80000000, sysc_do_svc + 0x80000000 | |
6a2df3a8 MS |
889 | cleanup_table_sysc_tif: |
890 | .long sysc_tif + 0x80000000, sysc_restore + 0x80000000 | |
891 | cleanup_table_sysc_restore: | |
892 | .long sysc_restore + 0x80000000, sysc_done + 0x80000000 | |
893 | cleanup_table_io_tif: | |
894 | .long io_tif + 0x80000000, io_restore + 0x80000000 | |
895 | cleanup_table_io_restore: | |
896 | .long io_restore + 0x80000000, io_done + 0x80000000 | |
1da177e4 LT |
897 | |
898 | cleanup_critical: | |
899 | clc 4(4,%r12),BASED(cleanup_table_system_call) | |
900 | bl BASED(0f) | |
901 | clc 4(4,%r12),BASED(cleanup_table_system_call+4) | |
902 | bl BASED(cleanup_system_call) | |
903 | 0: | |
6a2df3a8 | 904 | clc 4(4,%r12),BASED(cleanup_table_sysc_tif) |
1da177e4 | 905 | bl BASED(0f) |
6a2df3a8 MS |
906 | clc 4(4,%r12),BASED(cleanup_table_sysc_tif+4) |
907 | bl BASED(cleanup_sysc_tif) | |
1da177e4 | 908 | 0: |
6a2df3a8 | 909 | clc 4(4,%r12),BASED(cleanup_table_sysc_restore) |
1da177e4 | 910 | bl BASED(0f) |
6a2df3a8 MS |
911 | clc 4(4,%r12),BASED(cleanup_table_sysc_restore+4) |
912 | bl BASED(cleanup_sysc_restore) | |
63b12246 | 913 | 0: |
6a2df3a8 | 914 | clc 4(4,%r12),BASED(cleanup_table_io_tif) |
63b12246 | 915 | bl BASED(0f) |
6a2df3a8 MS |
916 | clc 4(4,%r12),BASED(cleanup_table_io_tif+4) |
917 | bl BASED(cleanup_io_tif) | |
ae6aa2ea | 918 | 0: |
6a2df3a8 | 919 | clc 4(4,%r12),BASED(cleanup_table_io_restore) |
ae6aa2ea | 920 | bl BASED(0f) |
6a2df3a8 MS |
921 | clc 4(4,%r12),BASED(cleanup_table_io_restore+4) |
922 | bl BASED(cleanup_io_restore) | |
1da177e4 LT |
923 | 0: |
924 | br %r14 | |
925 | ||
926 | cleanup_system_call: | |
927 | mvc __LC_RETURN_PSW(8),0(%r12) | |
1da177e4 LT |
928 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) |
929 | bh BASED(0f) | |
6377981f MS |
930 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
931 | c %r12,BASED(.Lmck_old_psw) | |
932 | be BASED(0f) | |
1da177e4 | 933 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER |
6377981f MS |
934 | 0: c %r12,BASED(.Lmck_old_psw) |
935 | la %r12,__LC_SAVE_AREA+32 | |
936 | be BASED(0f) | |
937 | la %r12,__LC_SAVE_AREA+16 | |
1da177e4 LT |
938 | 0: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) |
939 | bhe BASED(cleanup_vtime) | |
1da177e4 LT |
940 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) |
941 | bh BASED(0f) | |
ae6aa2ea MS |
942 | mvc __LC_SAVE_AREA(16),0(%r12) |
943 | 0: st %r13,4(%r12) | |
944 | st %r12,__LC_SAVE_AREA+48 # argh | |
63b12246 | 945 | SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 946 | CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
ae6aa2ea MS |
947 | l %r12,__LC_SAVE_AREA+48 # argh |
948 | st %r15,12(%r12) | |
1da177e4 | 949 | lh %r7,0x8a |
1da177e4 LT |
950 | cleanup_vtime: |
951 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) | |
952 | bhe BASED(cleanup_stime) | |
1da177e4 LT |
953 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
954 | cleanup_stime: | |
955 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) | |
956 | bh BASED(cleanup_update) | |
957 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
958 | cleanup_update: | |
959 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
960 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) |
961 | la %r12,__LC_RETURN_PSW | |
962 | br %r14 | |
963 | cleanup_system_call_insn: | |
964 | .long sysc_saveall + 0x80000000 | |
25d83cbf HC |
965 | .long system_call + 0x80000000 |
966 | .long sysc_vtime + 0x80000000 | |
967 | .long sysc_stime + 0x80000000 | |
968 | .long sysc_update + 0x80000000 | |
1da177e4 | 969 | |
6a2df3a8 | 970 | cleanup_sysc_tif: |
1da177e4 | 971 | mvc __LC_RETURN_PSW(4),0(%r12) |
6a2df3a8 | 972 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif) |
1da177e4 LT |
973 | la %r12,__LC_RETURN_PSW |
974 | br %r14 | |
975 | ||
6a2df3a8 MS |
976 | cleanup_sysc_restore: |
977 | clc 4(4,%r12),BASED(cleanup_sysc_restore_insn) | |
ae6aa2ea | 978 | be BASED(2f) |
6377981f MS |
979 | mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER |
980 | c %r12,BASED(.Lmck_old_psw) | |
981 | be BASED(0f) | |
1da177e4 | 982 | mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER |
6377981f | 983 | 0: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4) |
ae6aa2ea | 984 | be BASED(2f) |
1da177e4 | 985 | mvc __LC_RETURN_PSW(8),SP_PSW(%r15) |
ae6aa2ea | 986 | c %r12,BASED(.Lmck_old_psw) |
6377981f MS |
987 | la %r12,__LC_SAVE_AREA+32 |
988 | be BASED(1f) | |
989 | la %r12,__LC_SAVE_AREA+16 | |
990 | 1: mvc 0(16,%r12),SP_R12(%r15) | |
991 | lm %r0,%r11,SP_R0(%r15) | |
1da177e4 | 992 | l %r15,SP_R15(%r15) |
ae6aa2ea | 993 | 2: la %r12,__LC_RETURN_PSW |
1da177e4 | 994 | br %r14 |
6a2df3a8 | 995 | cleanup_sysc_restore_insn: |
411788ea | 996 | .long sysc_done - 4 + 0x80000000 |
411788ea | 997 | .long sysc_done - 8 + 0x80000000 |
1da177e4 | 998 | |
6a2df3a8 | 999 | cleanup_io_tif: |
176b1803 | 1000 | mvc __LC_RETURN_PSW(4),0(%r12) |
6a2df3a8 | 1001 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif) |
176b1803 MS |
1002 | la %r12,__LC_RETURN_PSW |
1003 | br %r14 | |
1004 | ||
6a2df3a8 MS |
1005 | cleanup_io_restore: |
1006 | clc 4(4,%r12),BASED(cleanup_io_restore_insn) | |
6377981f MS |
1007 | be BASED(1f) |
1008 | mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER | |
6a2df3a8 | 1009 | clc 4(4,%r12),BASED(cleanup_io_restore_insn+4) |
6377981f | 1010 | be BASED(1f) |
ae6aa2ea | 1011 | mvc __LC_RETURN_PSW(8),SP_PSW(%r15) |
ae6aa2ea | 1012 | mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) |
6377981f | 1013 | lm %r0,%r11,SP_R0(%r15) |
ae6aa2ea | 1014 | l %r15,SP_R15(%r15) |
6377981f | 1015 | 1: la %r12,__LC_RETURN_PSW |
ae6aa2ea | 1016 | br %r14 |
6a2df3a8 | 1017 | cleanup_io_restore_insn: |
411788ea | 1018 | .long io_done - 4 + 0x80000000 |
411788ea | 1019 | .long io_done - 8 + 0x80000000 |
ae6aa2ea | 1020 | |
1da177e4 LT |
1021 | /* |
1022 | * Integer constants | |
1023 | */ | |
25d83cbf HC |
1024 | .align 4 |
1025 | .Lc_spsize: .long SP_SIZE | |
1026 | .Lc_overhead: .long STACK_FRAME_OVERHEAD | |
25d83cbf HC |
1027 | .Lnr_syscalls: .long NR_syscalls |
1028 | .L0x018: .short 0x018 | |
1029 | .L0x020: .short 0x020 | |
1030 | .L0x028: .short 0x028 | |
1031 | .L0x030: .short 0x030 | |
1032 | .L0x038: .short 0x038 | |
1033 | .Lc_1: .long 1 | |
1da177e4 LT |
1034 | |
1035 | /* | |
1036 | * Symbol constants | |
1037 | */ | |
25d83cbf | 1038 | .Ls390_mcck: .long s390_do_machine_check |
77fa2245 | 1039 | .Ls390_handle_mcck: |
25d83cbf HC |
1040 | .long s390_handle_mcck |
1041 | .Lmck_old_psw: .long __LC_MCK_OLD_PSW | |
1042 | .Ldo_IRQ: .long do_IRQ | |
1043 | .Ldo_extint: .long do_extint | |
1044 | .Ldo_signal: .long do_signal | |
753c4dd6 MS |
1045 | .Ldo_notify_resume: |
1046 | .long do_notify_resume | |
25d83cbf | 1047 | .Lhandle_per: .long do_single_step |
03ff9a23 MS |
1048 | .Ldo_execve: .long do_execve |
1049 | .Lexecve_tail: .long execve_tail | |
25d83cbf HC |
1050 | .Ljump_table: .long pgm_check_table |
1051 | .Lschedule: .long schedule | |
ab1809b4 | 1052 | #ifdef CONFIG_PREEMPT |
b8e7a54c HC |
1053 | .Lpreempt_schedule_irq: |
1054 | .long preempt_schedule_irq | |
ab1809b4 | 1055 | #endif |
753c4dd6 MS |
1056 | .Ltrace_entry: .long do_syscall_trace_enter |
1057 | .Ltrace_exit: .long do_syscall_trace_exit | |
25d83cbf HC |
1058 | .Lschedtail: .long schedule_tail |
1059 | .Lsysc_table: .long sys_call_table | |
1f194a4c | 1060 | #ifdef CONFIG_TRACE_IRQFLAGS |
50bec4ce HC |
1061 | .Ltrace_irq_on_caller: |
1062 | .long trace_hardirqs_on_caller | |
1063 | .Ltrace_irq_off_caller: | |
1064 | .long trace_hardirqs_off_caller | |
af4c6874 HC |
1065 | #endif |
1066 | #ifdef CONFIG_LOCKDEP | |
523b44cf HC |
1067 | .Llockdep_sys_exit: |
1068 | .long lockdep_sys_exit | |
1f194a4c | 1069 | #endif |
1da177e4 | 1070 | .Lcritical_start: |
25d83cbf | 1071 | .long __critical_start + 0x80000000 |
1da177e4 | 1072 | .Lcritical_end: |
25d83cbf | 1073 | .long __critical_end + 0x80000000 |
1da177e4 | 1074 | .Lcleanup_critical: |
25d83cbf | 1075 | .long cleanup_critical |
1da177e4 | 1076 | |
25d83cbf | 1077 | .section .rodata, "a" |
1da177e4 | 1078 | #define SYSCALL(esa,esame,emu) .long esa |
9bf1226b | 1079 | .globl sys_call_table |
1da177e4 LT |
1080 | sys_call_table: |
1081 | #include "syscalls.S" | |
1082 | #undef SYSCALL |