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 LT |
15 | #include <asm/cache.h> |
16 | #include <asm/lowcore.h> | |
17 | #include <asm/errno.h> | |
18 | #include <asm/ptrace.h> | |
19 | #include <asm/thread_info.h> | |
0013a854 | 20 | #include <asm/asm-offsets.h> |
1da177e4 LT |
21 | #include <asm/unistd.h> |
22 | #include <asm/page.h> | |
23 | ||
24 | /* | |
25 | * Stack layout for the system_call stack entry. | |
26 | * The first few entries are identical to the user_regs_struct. | |
27 | */ | |
25d83cbf HC |
28 | SP_PTREGS = STACK_FRAME_OVERHEAD |
29 | SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS | |
30 | SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW | |
31 | SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS | |
32 | SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 | |
33 | SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 | |
34 | SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 | |
35 | SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 | |
36 | SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 | |
37 | SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 | |
38 | SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 | |
39 | SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 | |
40 | SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 | |
41 | SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 | |
42 | SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 | |
43 | SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 | |
44 | SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 | |
45 | SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 | |
46 | SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 | |
47 | SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 | |
48 | SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC | |
59da2139 | 49 | SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR |
25d83cbf | 50 | SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE |
1da177e4 | 51 | |
753c4dd6 | 52 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 53 | _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) |
753c4dd6 | 54 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 55 | _TIF_MCCK_PENDING) |
9bf1226b HC |
56 | _TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ |
57 | _TIF_SECCOMP>>8 | _TIF_SYSCALL_FTRACE>>8) | |
1da177e4 LT |
58 | |
59 | STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER | |
60 | STACK_SIZE = 1 << STACK_SHIFT | |
61 | ||
62 | #define BASED(name) name-system_call(%r13) | |
63 | ||
1f194a4c HC |
64 | #ifdef CONFIG_TRACE_IRQFLAGS |
65 | .macro TRACE_IRQS_ON | |
50bec4ce HC |
66 | basr %r2,%r0 |
67 | l %r1,BASED(.Ltrace_irq_on_caller) | |
1f194a4c HC |
68 | basr %r14,%r1 |
69 | .endm | |
70 | ||
71 | .macro TRACE_IRQS_OFF | |
50bec4ce HC |
72 | basr %r2,%r0 |
73 | l %r1,BASED(.Ltrace_irq_off_caller) | |
1f194a4c HC |
74 | basr %r14,%r1 |
75 | .endm | |
523b44cf | 76 | |
411788ea | 77 | .macro TRACE_IRQS_CHECK |
50bec4ce | 78 | basr %r2,%r0 |
411788ea HC |
79 | tm SP_PSW(%r15),0x03 # irqs enabled? |
80 | jz 0f | |
50bec4ce | 81 | l %r1,BASED(.Ltrace_irq_on_caller) |
523b44cf | 82 | basr %r14,%r1 |
411788ea | 83 | j 1f |
50bec4ce | 84 | 0: l %r1,BASED(.Ltrace_irq_off_caller) |
411788ea HC |
85 | basr %r14,%r1 |
86 | 1: | |
523b44cf | 87 | .endm |
1f194a4c HC |
88 | #else |
89 | #define TRACE_IRQS_ON | |
90 | #define TRACE_IRQS_OFF | |
411788ea HC |
91 | #define TRACE_IRQS_CHECK |
92 | #endif | |
93 | ||
94 | #ifdef CONFIG_LOCKDEP | |
95 | .macro LOCKDEP_SYS_EXIT | |
96 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
97 | jz 0f | |
98 | l %r1,BASED(.Llockdep_sys_exit) | |
99 | basr %r14,%r1 | |
100 | 0: | |
101 | .endm | |
102 | #else | |
523b44cf | 103 | #define LOCKDEP_SYS_EXIT |
1f194a4c HC |
104 | #endif |
105 | ||
1da177e4 LT |
106 | /* |
107 | * Register usage in interrupt handlers: | |
108 | * R9 - pointer to current task structure | |
109 | * R13 - pointer to literal pool | |
110 | * R14 - return register for function calls | |
111 | * R15 - kernel stack pointer | |
112 | */ | |
113 | ||
25d83cbf | 114 | .macro UPDATE_VTIME lc_from,lc_to,lc_sum |
1da177e4 LT |
115 | lm %r10,%r11,\lc_from |
116 | sl %r10,\lc_to | |
117 | sl %r11,\lc_to+4 | |
118 | bc 3,BASED(0f) | |
119 | sl %r10,BASED(.Lc_1) | |
120 | 0: al %r10,\lc_sum | |
121 | al %r11,\lc_sum+4 | |
122 | bc 12,BASED(1f) | |
123 | al %r10,BASED(.Lc_1) | |
124 | 1: stm %r10,%r11,\lc_sum | |
125 | .endm | |
1da177e4 LT |
126 | |
127 | .macro SAVE_ALL_BASE savearea | |
128 | stm %r12,%r15,\savearea | |
129 | l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 | |
130 | .endm | |
131 | ||
987ad70a MS |
132 | .macro SAVE_ALL_SVC psworg,savearea |
133 | la %r12,\psworg | |
134 | l %r15,__LC_KERNEL_STACK # problem state -> load ksp | |
135 | .endm | |
136 | ||
63b12246 | 137 | .macro SAVE_ALL_SYNC psworg,savearea |
1da177e4 | 138 | la %r12,\psworg |
1da177e4 LT |
139 | tm \psworg+1,0x01 # test problem state bit |
140 | bz BASED(2f) # skip stack setup save | |
141 | l %r15,__LC_KERNEL_STACK # problem state -> load ksp | |
63b12246 MS |
142 | #ifdef CONFIG_CHECK_STACK |
143 | b BASED(3f) | |
144 | 2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD | |
145 | bz BASED(stack_overflow) | |
146 | 3: | |
147 | #endif | |
148 | 2: | |
149 | .endm | |
150 | ||
151 | .macro SAVE_ALL_ASYNC psworg,savearea | |
152 | la %r12,\psworg | |
1da177e4 LT |
153 | tm \psworg+1,0x01 # test problem state bit |
154 | bnz BASED(1f) # from user -> load async stack | |
155 | clc \psworg+4(4),BASED(.Lcritical_end) | |
156 | bhe BASED(0f) | |
157 | clc \psworg+4(4),BASED(.Lcritical_start) | |
158 | bl BASED(0f) | |
159 | l %r14,BASED(.Lcleanup_critical) | |
160 | basr %r14,%r14 | |
6add9f7f | 161 | tm 1(%r12),0x01 # retest problem state after cleanup |
1da177e4 LT |
162 | bnz BASED(1f) |
163 | 0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? | |
164 | slr %r14,%r15 | |
165 | sra %r14,STACK_SHIFT | |
166 | be BASED(2f) | |
167 | 1: l %r15,__LC_ASYNC_STACK | |
1da177e4 LT |
168 | #ifdef CONFIG_CHECK_STACK |
169 | b BASED(3f) | |
170 | 2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD | |
171 | bz BASED(stack_overflow) | |
172 | 3: | |
173 | #endif | |
77fa2245 HC |
174 | 2: |
175 | .endm | |
176 | ||
25d83cbf | 177 | .macro CREATE_STACK_FRAME psworg,savearea |
77fa2245 | 178 | s %r15,BASED(.Lc_spsize) # make room for registers & psw |
1da177e4 | 179 | mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack |
1da177e4 | 180 | st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 |
59da2139 | 181 | icm %r12,3,__LC_SVC_ILC |
1da177e4 | 182 | stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack |
59da2139 | 183 | st %r12,SP_SVCNR(%r15) |
1da177e4 LT |
184 | mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack |
185 | la %r12,0 | |
186 | st %r12,__SF_BACKCHAIN(%r15) # clear back chain | |
187 | .endm | |
188 | ||
25d83cbf | 189 | .macro RESTORE_ALL psworg,sync |
ae6aa2ea | 190 | mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore |
1da177e4 | 191 | .if !\sync |
ae6aa2ea | 192 | ni \psworg+1,0xfd # clear wait state bit |
1da177e4 LT |
193 | .endif |
194 | lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user | |
c185b783 | 195 | stpt __LC_EXIT_TIMER |
ae6aa2ea | 196 | lpsw \psworg # back to caller |
1da177e4 LT |
197 | .endm |
198 | ||
199 | /* | |
200 | * Scheduler resume function, called by switch_to | |
201 | * gpr2 = (task_struct *) prev | |
202 | * gpr3 = (task_struct *) next | |
203 | * Returns: | |
204 | * gpr2 = prev | |
205 | */ | |
25d83cbf | 206 | .globl __switch_to |
1da177e4 | 207 | __switch_to: |
25d83cbf | 208 | basr %r1,0 |
1da177e4 LT |
209 | __switch_to_base: |
210 | tm __THREAD_per(%r3),0xe8 # new process is using per ? | |
211 | bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine | |
25d83cbf HC |
212 | stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff |
213 | clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) | |
214 | be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's | |
215 | lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't | |
1da177e4 | 216 | __switch_to_noper: |
77fa2245 HC |
217 | l %r4,__THREAD_info(%r2) # get thread_info of prev |
218 | tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? | |
219 | bz __switch_to_no_mcck-__switch_to_base(%r1) | |
220 | ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
221 | l %r4,__THREAD_info(%r3) # get thread_info of next | |
222 | oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next | |
223 | __switch_to_no_mcck: | |
25d83cbf | 224 | stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task |
1da177e4 LT |
225 | st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp |
226 | l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp | |
227 | lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task | |
228 | st %r3,__LC_CURRENT # __LC_CURRENT = current task struct | |
229 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
25d83cbf | 230 | l %r3,__THREAD_info(%r3) # load thread_info from task struct |
1da177e4 LT |
231 | st %r3,__LC_THREAD_INFO |
232 | ahi %r3,STACK_SIZE | |
233 | st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack | |
234 | br %r14 | |
235 | ||
236 | __critical_start: | |
237 | /* | |
238 | * SVC interrupt handler routine. System calls are synchronous events and | |
239 | * are executed with interrupts enabled. | |
240 | */ | |
241 | ||
25d83cbf | 242 | .globl system_call |
1da177e4 | 243 | system_call: |
c185b783 | 244 | stpt __LC_SYNC_ENTER_TIMER |
1da177e4 LT |
245 | sysc_saveall: |
246 | SAVE_ALL_BASE __LC_SAVE_AREA | |
987ad70a | 247 | SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 248 | CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
1da177e4 | 249 | lh %r7,0x8a # get svc number from lowcore |
1da177e4 | 250 | sysc_vtime: |
1da177e4 LT |
251 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
252 | sysc_stime: | |
253 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
254 | sysc_update: | |
255 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
256 | sysc_do_svc: |
257 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct | |
59da2139 | 258 | ltr %r7,%r7 # test for svc 0 |
25d83cbf | 259 | bnz BASED(sysc_nr_ok) # svc number > 0 |
1da177e4 LT |
260 | # svc 0: system call number in %r1 |
261 | cl %r1,BASED(.Lnr_syscalls) | |
262 | bnl BASED(sysc_nr_ok) | |
25d83cbf | 263 | lr %r7,%r1 # copy svc number to %r7 |
1da177e4 LT |
264 | sysc_nr_ok: |
265 | mvc SP_ARGS(4,%r15),SP_R7(%r15) | |
266 | sysc_do_restart: | |
59da2139 MS |
267 | sth %r7,SP_SVCNR(%r15) |
268 | sll %r7,2 # svc number *4 | |
d882b172 | 269 | l %r8,BASED(.Lsysc_table) |
bcf5cef7 | 270 | tm __TI_flags+2(%r9),_TIF_SYSCALL |
d882b172 | 271 | l %r8,0(%r7,%r8) # get system call addr. |
25d83cbf HC |
272 | bnz BASED(sysc_tracesys) |
273 | basr %r14,%r8 # call sys_xxxx | |
274 | st %r2,SP_R2(%r15) # store return value (change R2 on stack) | |
1da177e4 LT |
275 | |
276 | sysc_return: | |
1da177e4 LT |
277 | tm __TI_flags+3(%r9),_TIF_WORK_SVC |
278 | bnz BASED(sysc_work) # there is work to do (signals etc.) | |
411788ea HC |
279 | sysc_restore: |
280 | #ifdef CONFIG_TRACE_IRQFLAGS | |
281 | la %r1,BASED(sysc_restore_trace_psw) | |
282 | lpsw 0(%r1) | |
283 | sysc_restore_trace: | |
284 | TRACE_IRQS_CHECK | |
523b44cf | 285 | LOCKDEP_SYS_EXIT |
411788ea | 286 | #endif |
1da177e4 | 287 | sysc_leave: |
25d83cbf | 288 | RESTORE_ALL __LC_RETURN_PSW,1 |
411788ea HC |
289 | sysc_done: |
290 | ||
291 | #ifdef CONFIG_TRACE_IRQFLAGS | |
292 | .align 8 | |
293 | .globl sysc_restore_trace_psw | |
294 | sysc_restore_trace_psw: | |
295 | .long 0, sysc_restore_trace + 0x80000000 | |
296 | #endif | |
1da177e4 LT |
297 | |
298 | # | |
299 | # recheck if there is more work to do | |
300 | # | |
301 | sysc_work_loop: | |
302 | tm __TI_flags+3(%r9),_TIF_WORK_SVC | |
411788ea | 303 | bz BASED(sysc_restore) # there is no work to do |
1da177e4 LT |
304 | # |
305 | # One of the work bits is on. Find out which one. | |
306 | # | |
307 | sysc_work: | |
2688905e MS |
308 | tm SP_PSW+1(%r15),0x01 # returning to user ? |
309 | bno BASED(sysc_restore) | |
77fa2245 HC |
310 | tm __TI_flags+3(%r9),_TIF_MCCK_PENDING |
311 | bo BASED(sysc_mcck_pending) | |
1da177e4 LT |
312 | tm __TI_flags+3(%r9),_TIF_NEED_RESCHED |
313 | bo BASED(sysc_reschedule) | |
02a029b3 | 314 | tm __TI_flags+3(%r9),_TIF_SIGPENDING |
54dfe5dd | 315 | bnz BASED(sysc_sigpending) |
753c4dd6 MS |
316 | tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME |
317 | bnz BASED(sysc_notify_resume) | |
1da177e4 LT |
318 | tm __TI_flags+3(%r9),_TIF_RESTART_SVC |
319 | bo BASED(sysc_restart) | |
320 | tm __TI_flags+3(%r9),_TIF_SINGLE_STEP | |
321 | bo BASED(sysc_singlestep) | |
411788ea HC |
322 | b BASED(sysc_restore) |
323 | sysc_work_done: | |
1da177e4 LT |
324 | |
325 | # | |
326 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
327 | # |
328 | sysc_reschedule: | |
329 | l %r1,BASED(.Lschedule) | |
330 | la %r14,BASED(sysc_work_loop) | |
331 | br %r1 # call scheduler | |
1da177e4 | 332 | |
77fa2245 HC |
333 | # |
334 | # _TIF_MCCK_PENDING is set, call handler | |
335 | # | |
336 | sysc_mcck_pending: | |
337 | l %r1,BASED(.Ls390_handle_mcck) | |
338 | la %r14,BASED(sysc_work_loop) | |
339 | br %r1 # TIF bit will be cleared by handler | |
340 | ||
1da177e4 | 341 | # |
02a029b3 | 342 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 343 | # |
25d83cbf | 344 | sysc_sigpending: |
1da177e4 | 345 | ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP |
25d83cbf HC |
346 | la %r2,SP_PTREGS(%r15) # load pt_regs |
347 | l %r1,BASED(.Ldo_signal) | |
348 | basr %r14,%r1 # call do_signal | |
1da177e4 LT |
349 | tm __TI_flags+3(%r9),_TIF_RESTART_SVC |
350 | bo BASED(sysc_restart) | |
351 | tm __TI_flags+3(%r9),_TIF_SINGLE_STEP | |
352 | bo BASED(sysc_singlestep) | |
e1c3ad96 | 353 | b BASED(sysc_work_loop) |
1da177e4 | 354 | |
753c4dd6 MS |
355 | # |
356 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
357 | # | |
358 | sysc_notify_resume: | |
359 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
360 | l %r1,BASED(.Ldo_notify_resume) | |
361 | la %r14,BASED(sysc_work_loop) | |
362 | br %r1 # call do_notify_resume | |
363 | ||
364 | ||
1da177e4 LT |
365 | # |
366 | # _TIF_RESTART_SVC is set, set up registers and restart svc | |
367 | # | |
368 | sysc_restart: | |
369 | ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC | |
25d83cbf | 370 | l %r7,SP_R2(%r15) # load new svc number |
1da177e4 | 371 | mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument |
25d83cbf HC |
372 | lm %r2,%r6,SP_R2(%r15) # load svc arguments |
373 | b BASED(sysc_do_restart) # restart svc | |
1da177e4 LT |
374 | |
375 | # | |
376 | # _TIF_SINGLE_STEP is set, call do_single_step | |
377 | # | |
378 | sysc_singlestep: | |
379 | ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP | |
59da2139 MS |
380 | mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check |
381 | mvi SP_SVCNR+1(%r15),0xff | |
1da177e4 LT |
382 | la %r2,SP_PTREGS(%r15) # address of register-save area |
383 | l %r1,BASED(.Lhandle_per) # load adr. of per handler | |
384 | la %r14,BASED(sysc_return) # load adr. of system return | |
385 | br %r1 # branch to do_single_step | |
386 | ||
1da177e4 | 387 | # |
753c4dd6 MS |
388 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
389 | # and after the system call | |
1da177e4 LT |
390 | # |
391 | sysc_tracesys: | |
753c4dd6 | 392 | l %r1,BASED(.Ltrace_entry) |
25d83cbf | 393 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 LT |
394 | la %r3,0 |
395 | srl %r7,2 | |
396 | st %r7,SP_R2(%r15) | |
397 | basr %r14,%r1 | |
753c4dd6 | 398 | cl %r2,BASED(.Lnr_syscalls) |
1da177e4 | 399 | bnl BASED(sysc_tracenogo) |
d882b172 | 400 | l %r8,BASED(.Lsysc_table) |
753c4dd6 | 401 | lr %r7,%r2 |
59da2139 | 402 | sll %r7,2 # svc number *4 |
d882b172 | 403 | l %r8,0(%r7,%r8) |
1da177e4 LT |
404 | sysc_tracego: |
405 | lm %r3,%r6,SP_R3(%r15) | |
406 | l %r2,SP_ORIG_R2(%r15) | |
25d83cbf HC |
407 | basr %r14,%r8 # call sys_xxx |
408 | st %r2,SP_R2(%r15) # store return value | |
1da177e4 | 409 | sysc_tracenogo: |
bcf5cef7 | 410 | tm __TI_flags+2(%r9),_TIF_SYSCALL |
25d83cbf | 411 | bz BASED(sysc_return) |
753c4dd6 | 412 | l %r1,BASED(.Ltrace_exit) |
25d83cbf | 413 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 LT |
414 | la %r14,BASED(sysc_return) |
415 | br %r1 | |
416 | ||
417 | # | |
418 | # a new process exits the kernel with ret_from_fork | |
419 | # | |
25d83cbf | 420 | .globl ret_from_fork |
1da177e4 LT |
421 | ret_from_fork: |
422 | l %r13,__LC_SVC_NEW_PSW+4 | |
423 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct | |
424 | tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? | |
425 | bo BASED(0f) | |
426 | st %r15,SP_R15(%r15) # store stack pointer for new kthread | |
25d83cbf HC |
427 | 0: l %r1,BASED(.Lschedtail) |
428 | basr %r14,%r1 | |
1f194a4c | 429 | TRACE_IRQS_ON |
25d83cbf | 430 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
8f2961c3 | 431 | b BASED(sysc_tracenogo) |
1da177e4 LT |
432 | |
433 | # | |
03ff9a23 MS |
434 | # kernel_execve function needs to deal with pt_regs that is not |
435 | # at the usual place | |
1da177e4 | 436 | # |
03ff9a23 MS |
437 | .globl kernel_execve |
438 | kernel_execve: | |
439 | stm %r12,%r15,48(%r15) | |
440 | lr %r14,%r15 | |
441 | l %r13,__LC_SVC_NEW_PSW+4 | |
442 | s %r15,BASED(.Lc_spsize) | |
443 | st %r14,__SF_BACKCHAIN(%r15) | |
444 | la %r12,SP_PTREGS(%r15) | |
445 | xc 0(__PT_SIZE,%r12),0(%r12) | |
446 | l %r1,BASED(.Ldo_execve) | |
447 | lr %r5,%r12 | |
448 | basr %r14,%r1 | |
449 | ltr %r2,%r2 | |
450 | be BASED(0f) | |
451 | a %r15,BASED(.Lc_spsize) | |
452 | lm %r12,%r15,48(%r15) | |
453 | br %r14 | |
454 | # execve succeeded. | |
455 | 0: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts | |
456 | l %r15,__LC_KERNEL_STACK # load ksp | |
457 | s %r15,BASED(.Lc_spsize) # make room for registers & psw | |
458 | l %r9,__LC_THREAD_INFO | |
459 | mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs | |
460 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
461 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
462 | l %r1,BASED(.Lexecve_tail) | |
463 | basr %r14,%r1 | |
464 | b BASED(sysc_return) | |
1da177e4 LT |
465 | |
466 | /* | |
467 | * Program check handler routine | |
468 | */ | |
469 | ||
25d83cbf | 470 | .globl pgm_check_handler |
1da177e4 LT |
471 | pgm_check_handler: |
472 | /* | |
473 | * First we need to check for a special case: | |
474 | * Single stepping an instruction that disables the PER event mask will | |
475 | * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. | |
476 | * For a single stepped SVC the program check handler gets control after | |
477 | * the SVC new PSW has been loaded. But we want to execute the SVC first and | |
478 | * then handle the PER event. Therefore we update the SVC old PSW to point | |
479 | * to the pgm_check_handler and branch to the SVC handler after we checked | |
480 | * if we have to load the kernel stack register. | |
481 | * For every other possible cause for PER event without the PER mask set | |
482 | * we just ignore the PER event (FIXME: is there anything we have to do | |
483 | * for LPSW?). | |
484 | */ | |
c185b783 | 485 | stpt __LC_SYNC_ENTER_TIMER |
1da177e4 | 486 | SAVE_ALL_BASE __LC_SAVE_AREA |
25d83cbf HC |
487 | tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception |
488 | bnz BASED(pgm_per) # got per exception -> special case | |
63b12246 | 489 | SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 490 | CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
1da177e4 LT |
491 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
492 | bz BASED(pgm_no_vtime) | |
493 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER | |
494 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
495 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
496 | pgm_no_vtime: | |
1da177e4 | 497 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
411788ea | 498 | TRACE_IRQS_OFF |
25d83cbf | 499 | l %r3,__LC_PGM_ILC # load program interruption code |
1da177e4 LT |
500 | la %r8,0x7f |
501 | nr %r8,%r3 | |
502 | pgm_do_call: | |
25d83cbf HC |
503 | l %r7,BASED(.Ljump_table) |
504 | sll %r8,2 | |
505 | l %r7,0(%r8,%r7) # load address of handler routine | |
506 | la %r2,SP_PTREGS(%r15) # address of register-save area | |
507 | la %r14,BASED(sysc_return) | |
508 | br %r7 # branch to interrupt-handler | |
1da177e4 LT |
509 | |
510 | # | |
511 | # handle per exception | |
512 | # | |
513 | pgm_per: | |
25d83cbf HC |
514 | tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on |
515 | bnz BASED(pgm_per_std) # ok, normal per event from user space | |
1da177e4 | 516 | # ok its one of the special cases, now we need to find out which one |
25d83cbf HC |
517 | clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW |
518 | be BASED(pgm_svcper) | |
1da177e4 | 519 | # no interesting special case, ignore PER event |
25d83cbf HC |
520 | lm %r12,%r15,__LC_SAVE_AREA |
521 | lpsw 0x28 | |
1da177e4 LT |
522 | |
523 | # | |
524 | # Normal per exception | |
525 | # | |
526 | pgm_per_std: | |
63b12246 | 527 | SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 528 | CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
1da177e4 LT |
529 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
530 | bz BASED(pgm_no_vtime2) | |
531 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER | |
532 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
533 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
534 | pgm_no_vtime2: | |
1da177e4 | 535 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
411788ea | 536 | TRACE_IRQS_OFF |
1da177e4 LT |
537 | l %r1,__TI_task(%r9) |
538 | mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID | |
539 | mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS | |
540 | mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID | |
541 | oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP | |
4ba069b8 MG |
542 | tm SP_PSW+1(%r15),0x01 # kernel per event ? |
543 | bz BASED(kernel_per) | |
25d83cbf | 544 | l %r3,__LC_PGM_ILC # load program interruption code |
1da177e4 | 545 | la %r8,0x7f |
25d83cbf HC |
546 | nr %r8,%r3 # clear per-event-bit and ilc |
547 | be BASED(sysc_return) # only per or per+check ? | |
1da177e4 LT |
548 | b BASED(pgm_do_call) |
549 | ||
550 | # | |
551 | # it was a single stepped SVC that is causing all the trouble | |
552 | # | |
553 | pgm_svcper: | |
63b12246 | 554 | SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 555 | CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
1da177e4 LT |
556 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
557 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
558 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
559 | lh %r7,0x8a # get svc number from lowcore |
560 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct | |
411788ea | 561 | TRACE_IRQS_OFF |
1da177e4 LT |
562 | l %r1,__TI_task(%r9) |
563 | mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID | |
564 | mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS | |
565 | mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID | |
566 | oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP | |
1f194a4c | 567 | TRACE_IRQS_ON |
1da177e4 LT |
568 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
569 | b BASED(sysc_do_svc) | |
570 | ||
4ba069b8 MG |
571 | # |
572 | # per was called from kernel, must be kprobes | |
573 | # | |
574 | kernel_per: | |
59da2139 MS |
575 | mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check |
576 | mvi SP_SVCNR+1(%r15),0xff | |
4ba069b8 MG |
577 | la %r2,SP_PTREGS(%r15) # address of register-save area |
578 | l %r1,BASED(.Lhandle_per) # load adr. of per handler | |
411788ea | 579 | la %r14,BASED(sysc_restore)# load adr. of system return |
4ba069b8 MG |
580 | br %r1 # branch to do_single_step |
581 | ||
1da177e4 LT |
582 | /* |
583 | * IO interrupt handler routine | |
584 | */ | |
585 | ||
25d83cbf | 586 | .globl io_int_handler |
1da177e4 | 587 | io_int_handler: |
1da177e4 | 588 | stck __LC_INT_CLOCK |
9cfb9b3c | 589 | stpt __LC_ASYNC_ENTER_TIMER |
1da177e4 | 590 | SAVE_ALL_BASE __LC_SAVE_AREA+16 |
63b12246 | 591 | SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 |
77fa2245 | 592 | CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 |
1da177e4 LT |
593 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
594 | bz BASED(io_no_vtime) | |
595 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER | |
596 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
597 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
598 | io_no_vtime: | |
1da177e4 | 599 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
1f194a4c | 600 | TRACE_IRQS_OFF |
25d83cbf HC |
601 | l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ |
602 | la %r2,SP_PTREGS(%r15) # address of register-save area | |
603 | basr %r14,%r1 # branch to standard irq handler | |
1da177e4 | 604 | io_return: |
1da177e4 | 605 | tm __TI_flags+3(%r9),_TIF_WORK_INT |
25d83cbf | 606 | bnz BASED(io_work) # there is work to do (signals etc.) |
411788ea HC |
607 | io_restore: |
608 | #ifdef CONFIG_TRACE_IRQFLAGS | |
609 | la %r1,BASED(io_restore_trace_psw) | |
610 | lpsw 0(%r1) | |
611 | io_restore_trace: | |
612 | TRACE_IRQS_CHECK | |
523b44cf | 613 | LOCKDEP_SYS_EXIT |
411788ea | 614 | #endif |
1da177e4 | 615 | io_leave: |
25d83cbf | 616 | RESTORE_ALL __LC_RETURN_PSW,0 |
ae6aa2ea | 617 | io_done: |
1da177e4 | 618 | |
411788ea HC |
619 | #ifdef CONFIG_TRACE_IRQFLAGS |
620 | .align 8 | |
621 | .globl io_restore_trace_psw | |
622 | io_restore_trace_psw: | |
623 | .long 0, io_restore_trace + 0x80000000 | |
624 | #endif | |
625 | ||
2688905e MS |
626 | # |
627 | # switch to kernel stack, then check the TIF bits | |
628 | # | |
629 | io_work: | |
630 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
631 | #ifndef CONFIG_PREEMPT | |
632 | bno BASED(io_restore) # no-> skip resched & signal | |
633 | #else | |
634 | bnz BASED(io_work_user) # no -> check for preemptive scheduling | |
635 | # check for preemptive scheduling | |
1da177e4 | 636 | icm %r0,15,__TI_precount(%r9) |
2688905e | 637 | bnz BASED(io_restore) # preemption disabled |
1da177e4 LT |
638 | l %r1,SP_R15(%r15) |
639 | s %r1,BASED(.Lc_spsize) | |
640 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 641 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
1da177e4 LT |
642 | lr %r15,%r1 |
643 | io_resume_loop: | |
644 | tm __TI_flags+3(%r9),_TIF_NEED_RESCHED | |
411788ea | 645 | bno BASED(io_restore) |
b8e7a54c HC |
646 | l %r1,BASED(.Lpreempt_schedule_irq) |
647 | la %r14,BASED(io_resume_loop) | |
648 | br %r1 # call schedule | |
1da177e4 LT |
649 | #endif |
650 | ||
2688905e | 651 | io_work_user: |
1da177e4 LT |
652 | l %r1,__LC_KERNEL_STACK |
653 | s %r1,BASED(.Lc_spsize) | |
654 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 655 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
1da177e4 LT |
656 | lr %r15,%r1 |
657 | # | |
658 | # One of the work bits is on. Find out which one. | |
02a029b3 | 659 | # Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED |
25d83cbf | 660 | # and _TIF_MCCK_PENDING |
1da177e4 LT |
661 | # |
662 | io_work_loop: | |
77fa2245 | 663 | tm __TI_flags+3(%r9),_TIF_MCCK_PENDING |
25d83cbf | 664 | bo BASED(io_mcck_pending) |
1da177e4 LT |
665 | tm __TI_flags+3(%r9),_TIF_NEED_RESCHED |
666 | bo BASED(io_reschedule) | |
02a029b3 | 667 | tm __TI_flags+3(%r9),_TIF_SIGPENDING |
54dfe5dd | 668 | bnz BASED(io_sigpending) |
753c4dd6 MS |
669 | tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME |
670 | bnz BASED(io_notify_resume) | |
411788ea HC |
671 | b BASED(io_restore) |
672 | io_work_done: | |
1da177e4 | 673 | |
77fa2245 HC |
674 | # |
675 | # _TIF_MCCK_PENDING is set, call handler | |
676 | # | |
677 | io_mcck_pending: | |
678 | l %r1,BASED(.Ls390_handle_mcck) | |
b771aeac | 679 | basr %r14,%r1 # TIF bit will be cleared by handler |
b771aeac | 680 | b BASED(io_work_loop) |
77fa2245 | 681 | |
1da177e4 LT |
682 | # |
683 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
684 | # |
685 | io_reschedule: | |
411788ea | 686 | TRACE_IRQS_ON |
25d83cbf HC |
687 | l %r1,BASED(.Lschedule) |
688 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
689 | basr %r14,%r1 # call scheduler | |
690 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
411788ea | 691 | TRACE_IRQS_OFF |
1da177e4 | 692 | tm __TI_flags+3(%r9),_TIF_WORK_INT |
411788ea | 693 | bz BASED(io_restore) # there is no work to do |
1da177e4 LT |
694 | b BASED(io_work_loop) |
695 | ||
696 | # | |
02a029b3 | 697 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 698 | # |
25d83cbf | 699 | io_sigpending: |
411788ea | 700 | TRACE_IRQS_ON |
25d83cbf HC |
701 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
702 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
703 | l %r1,BASED(.Ldo_signal) | |
704 | basr %r14,%r1 # call do_signal | |
705 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
411788ea | 706 | TRACE_IRQS_OFF |
e1c3ad96 | 707 | b BASED(io_work_loop) |
1da177e4 | 708 | |
753c4dd6 MS |
709 | # |
710 | # _TIF_SIGPENDING is set, call do_signal | |
711 | # | |
712 | io_notify_resume: | |
713 | TRACE_IRQS_ON | |
714 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
715 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
716 | l %r1,BASED(.Ldo_notify_resume) | |
717 | basr %r14,%r1 # call do_signal | |
718 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
719 | TRACE_IRQS_OFF | |
720 | b BASED(io_work_loop) | |
721 | ||
1da177e4 LT |
722 | /* |
723 | * External interrupt handler routine | |
724 | */ | |
725 | ||
25d83cbf | 726 | .globl ext_int_handler |
1da177e4 | 727 | ext_int_handler: |
1da177e4 | 728 | stck __LC_INT_CLOCK |
9cfb9b3c | 729 | stpt __LC_ASYNC_ENTER_TIMER |
1da177e4 | 730 | SAVE_ALL_BASE __LC_SAVE_AREA+16 |
63b12246 | 731 | SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 |
77fa2245 | 732 | CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 |
1da177e4 LT |
733 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
734 | bz BASED(ext_no_vtime) | |
735 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER | |
736 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
737 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
738 | ext_no_vtime: | |
1da177e4 | 739 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
1f194a4c | 740 | TRACE_IRQS_OFF |
25d83cbf HC |
741 | la %r2,SP_PTREGS(%r15) # address of register-save area |
742 | lh %r3,__LC_EXT_INT_CODE # get interruption code | |
1da177e4 LT |
743 | l %r1,BASED(.Ldo_extint) |
744 | basr %r14,%r1 | |
745 | b BASED(io_return) | |
746 | ||
ae6aa2ea MS |
747 | __critical_end: |
748 | ||
1da177e4 LT |
749 | /* |
750 | * Machine check handler routines | |
751 | */ | |
752 | ||
25d83cbf | 753 | .globl mcck_int_handler |
1da177e4 | 754 | mcck_int_handler: |
9cfb9b3c | 755 | stck __LC_INT_CLOCK |
77fa2245 HC |
756 | spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer |
757 | lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs | |
1da177e4 | 758 | SAVE_ALL_BASE __LC_SAVE_AREA+32 |
77fa2245 | 759 | la %r12,__LC_MCK_OLD_PSW |
25d83cbf | 760 | tm __LC_MCCK_CODE,0x80 # system damage? |
77fa2245 | 761 | bo BASED(mcck_int_main) # yes -> rest of mcck code invalid |
63b12246 MS |
762 | mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER |
763 | mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA | |
764 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? | |
765 | bo BASED(1f) | |
766 | la %r14,__LC_SYNC_ENTER_TIMER | |
767 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
768 | bl BASED(0f) | |
769 | la %r14,__LC_ASYNC_ENTER_TIMER | |
770 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
771 | bl BASED(0f) | |
772 | la %r14,__LC_EXIT_TIMER | |
773 | 0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER | |
774 | bl BASED(0f) | |
775 | la %r14,__LC_LAST_UPDATE_TIMER | |
776 | 0: spt 0(%r14) | |
777 | mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) | |
c185b783 | 778 | 1: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
77fa2245 HC |
779 | bno BASED(mcck_int_main) # no -> skip cleanup critical |
780 | tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit | |
781 | bnz BASED(mcck_int_main) # from user -> load async stack | |
782 | clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) | |
783 | bhe BASED(mcck_int_main) | |
784 | clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) | |
785 | bl BASED(mcck_int_main) | |
786 | l %r14,BASED(.Lcleanup_critical) | |
787 | basr %r14,%r14 | |
788 | mcck_int_main: | |
789 | l %r14,__LC_PANIC_STACK # are we already on the panic stack? | |
790 | slr %r14,%r15 | |
791 | sra %r14,PAGE_SHIFT | |
792 | be BASED(0f) | |
793 | l %r15,__LC_PANIC_STACK # load panic stack | |
794 | 0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 | |
25d83cbf | 795 | tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? |
ae6aa2ea | 796 | bno BASED(mcck_no_vtime) # no -> skip cleanup critical |
63b12246 | 797 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
ae6aa2ea MS |
798 | bz BASED(mcck_no_vtime) |
799 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER | |
800 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
801 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
802 | mcck_no_vtime: | |
77fa2245 HC |
803 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
804 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
25d83cbf HC |
805 | l %r1,BASED(.Ls390_mcck) |
806 | basr %r14,%r1 # call machine check handler | |
807 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
77fa2245 | 808 | bno BASED(mcck_return) |
25d83cbf | 809 | l %r1,__LC_KERNEL_STACK # switch to kernel stack |
77fa2245 HC |
810 | s %r1,BASED(.Lc_spsize) |
811 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 812 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
77fa2245 HC |
813 | lr %r15,%r1 |
814 | stosm __SF_EMPTY(%r15),0x04 # turn dat on | |
815 | tm __TI_flags+3(%r9),_TIF_MCCK_PENDING | |
816 | bno BASED(mcck_return) | |
1f194a4c | 817 | TRACE_IRQS_OFF |
77fa2245 HC |
818 | l %r1,BASED(.Ls390_handle_mcck) |
819 | basr %r14,%r1 # call machine check handler | |
1f194a4c | 820 | TRACE_IRQS_ON |
1da177e4 | 821 | mcck_return: |
63b12246 MS |
822 | mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW |
823 | ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit | |
63b12246 MS |
824 | mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52 |
825 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? | |
826 | bno BASED(0f) | |
827 | lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 | |
828 | stpt __LC_EXIT_TIMER | |
829 | lpsw __LC_RETURN_MCCK_PSW # back to caller | |
c185b783 | 830 | 0: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 |
63b12246 MS |
831 | lpsw __LC_RETURN_MCCK_PSW # back to caller |
832 | ||
25d83cbf | 833 | RESTORE_ALL __LC_RETURN_MCCK_PSW,0 |
1da177e4 | 834 | |
1da177e4 LT |
835 | /* |
836 | * Restart interruption handler, kick starter for additional CPUs | |
837 | */ | |
84b36a8e | 838 | #ifdef CONFIG_SMP |
2bc89b5e | 839 | __CPUINIT |
25d83cbf | 840 | .globl restart_int_handler |
1da177e4 | 841 | restart_int_handler: |
5b409ed1 MS |
842 | basr %r1,0 |
843 | restart_base: | |
844 | spt restart_vtime-restart_base(%r1) | |
845 | stck __LC_LAST_UPDATE_CLOCK | |
846 | mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) | |
847 | mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) | |
25d83cbf HC |
848 | l %r15,__LC_SAVE_AREA+60 # load ksp |
849 | lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs | |
850 | lam %a0,%a15,__LC_AREGS_SAVE_AREA | |
851 | lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone | |
5b409ed1 MS |
852 | l %r1,__LC_THREAD_INFO |
853 | mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) | |
854 | mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) | |
855 | xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER | |
25d83cbf HC |
856 | stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on |
857 | basr %r14,0 | |
858 | l %r14,restart_addr-.(%r14) | |
859 | br %r14 # branch to start_secondary | |
1da177e4 | 860 | restart_addr: |
25d83cbf | 861 | .long start_secondary |
5b409ed1 MS |
862 | .align 8 |
863 | restart_vtime: | |
864 | .long 0x7fffffff,0xffffffff | |
84b36a8e | 865 | .previous |
1da177e4 LT |
866 | #else |
867 | /* | |
868 | * If we do not run with SMP enabled, let the new CPU crash ... | |
869 | */ | |
25d83cbf | 870 | .globl restart_int_handler |
1da177e4 | 871 | restart_int_handler: |
25d83cbf | 872 | basr %r1,0 |
1da177e4 | 873 | restart_base: |
25d83cbf HC |
874 | lpsw restart_crash-restart_base(%r1) |
875 | .align 8 | |
1da177e4 | 876 | restart_crash: |
25d83cbf | 877 | .long 0x000a0000,0x00000000 |
1da177e4 LT |
878 | restart_go: |
879 | #endif | |
880 | ||
881 | #ifdef CONFIG_CHECK_STACK | |
882 | /* | |
883 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
884 | * No need to properly save the registers, we are going to panic anyway. | |
885 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
886 | */ | |
887 | stack_overflow: | |
888 | l %r15,__LC_PANIC_STACK # change to panic stack | |
889 | sl %r15,BASED(.Lc_spsize) | |
890 | mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack | |
891 | stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack | |
892 | la %r1,__LC_SAVE_AREA | |
893 | ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? | |
894 | be BASED(0f) | |
895 | ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? | |
896 | be BASED(0f) | |
897 | la %r1,__LC_SAVE_AREA+16 | |
898 | 0: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack | |
25d83cbf | 899 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain |
1da177e4 | 900 | l %r1,BASED(1f) # branch to kernel_stack_overflow |
25d83cbf | 901 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 | 902 | br %r1 |
25d83cbf | 903 | 1: .long kernel_stack_overflow |
1da177e4 LT |
904 | #endif |
905 | ||
906 | cleanup_table_system_call: | |
907 | .long system_call + 0x80000000, sysc_do_svc + 0x80000000 | |
908 | cleanup_table_sysc_return: | |
909 | .long sysc_return + 0x80000000, sysc_leave + 0x80000000 | |
910 | cleanup_table_sysc_leave: | |
411788ea | 911 | .long sysc_leave + 0x80000000, sysc_done + 0x80000000 |
1da177e4 | 912 | cleanup_table_sysc_work_loop: |
411788ea | 913 | .long sysc_work_loop + 0x80000000, sysc_work_done + 0x80000000 |
63b12246 MS |
914 | cleanup_table_io_return: |
915 | .long io_return + 0x80000000, io_leave + 0x80000000 | |
ae6aa2ea MS |
916 | cleanup_table_io_leave: |
917 | .long io_leave + 0x80000000, io_done + 0x80000000 | |
918 | cleanup_table_io_work_loop: | |
411788ea | 919 | .long io_work_loop + 0x80000000, io_work_done + 0x80000000 |
1da177e4 LT |
920 | |
921 | cleanup_critical: | |
922 | clc 4(4,%r12),BASED(cleanup_table_system_call) | |
923 | bl BASED(0f) | |
924 | clc 4(4,%r12),BASED(cleanup_table_system_call+4) | |
925 | bl BASED(cleanup_system_call) | |
926 | 0: | |
927 | clc 4(4,%r12),BASED(cleanup_table_sysc_return) | |
928 | bl BASED(0f) | |
929 | clc 4(4,%r12),BASED(cleanup_table_sysc_return+4) | |
930 | bl BASED(cleanup_sysc_return) | |
931 | 0: | |
932 | clc 4(4,%r12),BASED(cleanup_table_sysc_leave) | |
933 | bl BASED(0f) | |
934 | clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4) | |
935 | bl BASED(cleanup_sysc_leave) | |
936 | 0: | |
937 | clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop) | |
938 | bl BASED(0f) | |
939 | clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4) | |
77fa2245 | 940 | bl BASED(cleanup_sysc_return) |
63b12246 MS |
941 | 0: |
942 | clc 4(4,%r12),BASED(cleanup_table_io_return) | |
943 | bl BASED(0f) | |
944 | clc 4(4,%r12),BASED(cleanup_table_io_return+4) | |
945 | bl BASED(cleanup_io_return) | |
ae6aa2ea MS |
946 | 0: |
947 | clc 4(4,%r12),BASED(cleanup_table_io_leave) | |
948 | bl BASED(0f) | |
949 | clc 4(4,%r12),BASED(cleanup_table_io_leave+4) | |
950 | bl BASED(cleanup_io_leave) | |
951 | 0: | |
952 | clc 4(4,%r12),BASED(cleanup_table_io_work_loop) | |
953 | bl BASED(0f) | |
954 | clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4) | |
955 | bl BASED(cleanup_io_return) | |
1da177e4 LT |
956 | 0: |
957 | br %r14 | |
958 | ||
959 | cleanup_system_call: | |
960 | mvc __LC_RETURN_PSW(8),0(%r12) | |
ae6aa2ea MS |
961 | c %r12,BASED(.Lmck_old_psw) |
962 | be BASED(0f) | |
963 | la %r12,__LC_SAVE_AREA+16 | |
964 | b BASED(1f) | |
965 | 0: la %r12,__LC_SAVE_AREA+32 | |
966 | 1: | |
1da177e4 LT |
967 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) |
968 | bh BASED(0f) | |
969 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
970 | 0: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) | |
971 | bhe BASED(cleanup_vtime) | |
1da177e4 LT |
972 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) |
973 | bh BASED(0f) | |
ae6aa2ea MS |
974 | mvc __LC_SAVE_AREA(16),0(%r12) |
975 | 0: st %r13,4(%r12) | |
976 | st %r12,__LC_SAVE_AREA+48 # argh | |
63b12246 | 977 | SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 978 | CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
ae6aa2ea MS |
979 | l %r12,__LC_SAVE_AREA+48 # argh |
980 | st %r15,12(%r12) | |
1da177e4 | 981 | lh %r7,0x8a |
1da177e4 LT |
982 | cleanup_vtime: |
983 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) | |
984 | bhe BASED(cleanup_stime) | |
1da177e4 LT |
985 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
986 | cleanup_stime: | |
987 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) | |
988 | bh BASED(cleanup_update) | |
989 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
990 | cleanup_update: | |
991 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
992 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) |
993 | la %r12,__LC_RETURN_PSW | |
994 | br %r14 | |
995 | cleanup_system_call_insn: | |
996 | .long sysc_saveall + 0x80000000 | |
25d83cbf HC |
997 | .long system_call + 0x80000000 |
998 | .long sysc_vtime + 0x80000000 | |
999 | .long sysc_stime + 0x80000000 | |
1000 | .long sysc_update + 0x80000000 | |
1da177e4 LT |
1001 | |
1002 | cleanup_sysc_return: | |
1003 | mvc __LC_RETURN_PSW(4),0(%r12) | |
1004 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return) | |
1005 | la %r12,__LC_RETURN_PSW | |
1006 | br %r14 | |
1007 | ||
1008 | cleanup_sysc_leave: | |
1009 | clc 4(4,%r12),BASED(cleanup_sysc_leave_insn) | |
ae6aa2ea | 1010 | be BASED(2f) |
1da177e4 LT |
1011 | mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER |
1012 | clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4) | |
ae6aa2ea | 1013 | be BASED(2f) |
1da177e4 | 1014 | mvc __LC_RETURN_PSW(8),SP_PSW(%r15) |
ae6aa2ea MS |
1015 | c %r12,BASED(.Lmck_old_psw) |
1016 | bne BASED(0f) | |
1017 | mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) | |
1018 | b BASED(1f) | |
1019 | 0: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) | |
1020 | 1: lm %r0,%r11,SP_R0(%r15) | |
1da177e4 | 1021 | l %r15,SP_R15(%r15) |
ae6aa2ea | 1022 | 2: la %r12,__LC_RETURN_PSW |
1da177e4 LT |
1023 | br %r14 |
1024 | cleanup_sysc_leave_insn: | |
411788ea | 1025 | .long sysc_done - 4 + 0x80000000 |
411788ea | 1026 | .long sysc_done - 8 + 0x80000000 |
1da177e4 | 1027 | |
ae6aa2ea MS |
1028 | cleanup_io_return: |
1029 | mvc __LC_RETURN_PSW(4),0(%r12) | |
1030 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop) | |
1031 | la %r12,__LC_RETURN_PSW | |
1032 | br %r14 | |
1033 | ||
1034 | cleanup_io_leave: | |
1035 | clc 4(4,%r12),BASED(cleanup_io_leave_insn) | |
1036 | be BASED(2f) | |
ae6aa2ea MS |
1037 | mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER |
1038 | clc 4(4,%r12),BASED(cleanup_io_leave_insn+4) | |
1039 | be BASED(2f) | |
ae6aa2ea MS |
1040 | mvc __LC_RETURN_PSW(8),SP_PSW(%r15) |
1041 | c %r12,BASED(.Lmck_old_psw) | |
1042 | bne BASED(0f) | |
1043 | mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) | |
1044 | b BASED(1f) | |
1045 | 0: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) | |
1046 | 1: lm %r0,%r11,SP_R0(%r15) | |
1047 | l %r15,SP_R15(%r15) | |
1048 | 2: la %r12,__LC_RETURN_PSW | |
1049 | br %r14 | |
1050 | cleanup_io_leave_insn: | |
411788ea | 1051 | .long io_done - 4 + 0x80000000 |
411788ea | 1052 | .long io_done - 8 + 0x80000000 |
ae6aa2ea | 1053 | |
1da177e4 LT |
1054 | /* |
1055 | * Integer constants | |
1056 | */ | |
25d83cbf HC |
1057 | .align 4 |
1058 | .Lc_spsize: .long SP_SIZE | |
1059 | .Lc_overhead: .long STACK_FRAME_OVERHEAD | |
25d83cbf HC |
1060 | .Lnr_syscalls: .long NR_syscalls |
1061 | .L0x018: .short 0x018 | |
1062 | .L0x020: .short 0x020 | |
1063 | .L0x028: .short 0x028 | |
1064 | .L0x030: .short 0x030 | |
1065 | .L0x038: .short 0x038 | |
1066 | .Lc_1: .long 1 | |
1da177e4 LT |
1067 | |
1068 | /* | |
1069 | * Symbol constants | |
1070 | */ | |
25d83cbf | 1071 | .Ls390_mcck: .long s390_do_machine_check |
77fa2245 | 1072 | .Ls390_handle_mcck: |
25d83cbf HC |
1073 | .long s390_handle_mcck |
1074 | .Lmck_old_psw: .long __LC_MCK_OLD_PSW | |
1075 | .Ldo_IRQ: .long do_IRQ | |
1076 | .Ldo_extint: .long do_extint | |
1077 | .Ldo_signal: .long do_signal | |
753c4dd6 MS |
1078 | .Ldo_notify_resume: |
1079 | .long do_notify_resume | |
25d83cbf | 1080 | .Lhandle_per: .long do_single_step |
03ff9a23 MS |
1081 | .Ldo_execve: .long do_execve |
1082 | .Lexecve_tail: .long execve_tail | |
25d83cbf HC |
1083 | .Ljump_table: .long pgm_check_table |
1084 | .Lschedule: .long schedule | |
ab1809b4 | 1085 | #ifdef CONFIG_PREEMPT |
b8e7a54c HC |
1086 | .Lpreempt_schedule_irq: |
1087 | .long preempt_schedule_irq | |
ab1809b4 | 1088 | #endif |
753c4dd6 MS |
1089 | .Ltrace_entry: .long do_syscall_trace_enter |
1090 | .Ltrace_exit: .long do_syscall_trace_exit | |
25d83cbf HC |
1091 | .Lschedtail: .long schedule_tail |
1092 | .Lsysc_table: .long sys_call_table | |
1f194a4c | 1093 | #ifdef CONFIG_TRACE_IRQFLAGS |
50bec4ce HC |
1094 | .Ltrace_irq_on_caller: |
1095 | .long trace_hardirqs_on_caller | |
1096 | .Ltrace_irq_off_caller: | |
1097 | .long trace_hardirqs_off_caller | |
af4c6874 HC |
1098 | #endif |
1099 | #ifdef CONFIG_LOCKDEP | |
523b44cf HC |
1100 | .Llockdep_sys_exit: |
1101 | .long lockdep_sys_exit | |
1f194a4c | 1102 | #endif |
1da177e4 | 1103 | .Lcritical_start: |
25d83cbf | 1104 | .long __critical_start + 0x80000000 |
1da177e4 | 1105 | .Lcritical_end: |
25d83cbf | 1106 | .long __critical_end + 0x80000000 |
1da177e4 | 1107 | .Lcleanup_critical: |
25d83cbf | 1108 | .long cleanup_critical |
1da177e4 | 1109 | |
25d83cbf | 1110 | .section .rodata, "a" |
1da177e4 | 1111 | #define SYSCALL(esa,esame,emu) .long esa |
9bf1226b | 1112 | .globl sys_call_table |
1da177e4 LT |
1113 | sys_call_table: |
1114 | #include "syscalls.S" | |
1115 | #undef SYSCALL |