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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 | ||
860dba45 MS |
191 | .section .kprobes.text, "ax" |
192 | ||
1da177e4 LT |
193 | /* |
194 | * Scheduler resume function, called by switch_to | |
195 | * gpr2 = (task_struct *) prev | |
196 | * gpr3 = (task_struct *) next | |
197 | * Returns: | |
198 | * gpr2 = prev | |
199 | */ | |
25d83cbf | 200 | .globl __switch_to |
1da177e4 | 201 | __switch_to: |
25d83cbf | 202 | basr %r1,0 |
1da177e4 LT |
203 | __switch_to_base: |
204 | tm __THREAD_per(%r3),0xe8 # new process is using per ? | |
205 | bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine | |
25d83cbf HC |
206 | stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff |
207 | clc __THREAD_per(12,%r3),__SF_EMPTY(%r15) | |
208 | be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's | |
209 | lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't | |
1da177e4 | 210 | __switch_to_noper: |
77fa2245 HC |
211 | l %r4,__THREAD_info(%r2) # get thread_info of prev |
212 | tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? | |
213 | bz __switch_to_no_mcck-__switch_to_base(%r1) | |
214 | ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
215 | l %r4,__THREAD_info(%r3) # get thread_info of next | |
216 | oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next | |
217 | __switch_to_no_mcck: | |
25d83cbf | 218 | stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task |
1da177e4 LT |
219 | st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp |
220 | l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp | |
221 | lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task | |
222 | st %r3,__LC_CURRENT # __LC_CURRENT = current task struct | |
223 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
25d83cbf | 224 | l %r3,__THREAD_info(%r3) # load thread_info from task struct |
1da177e4 LT |
225 | st %r3,__LC_THREAD_INFO |
226 | ahi %r3,STACK_SIZE | |
227 | st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack | |
228 | br %r14 | |
229 | ||
230 | __critical_start: | |
231 | /* | |
232 | * SVC interrupt handler routine. System calls are synchronous events and | |
233 | * are executed with interrupts enabled. | |
234 | */ | |
235 | ||
25d83cbf | 236 | .globl system_call |
1da177e4 | 237 | system_call: |
c185b783 | 238 | stpt __LC_SYNC_ENTER_TIMER |
1da177e4 LT |
239 | sysc_saveall: |
240 | SAVE_ALL_BASE __LC_SAVE_AREA | |
987ad70a | 241 | SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 242 | CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
1da177e4 | 243 | lh %r7,0x8a # get svc number from lowcore |
1da177e4 | 244 | sysc_vtime: |
1da177e4 LT |
245 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
246 | sysc_stime: | |
247 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
248 | sysc_update: | |
249 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
250 | sysc_do_svc: |
251 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct | |
59da2139 | 252 | ltr %r7,%r7 # test for svc 0 |
25d83cbf | 253 | bnz BASED(sysc_nr_ok) # svc number > 0 |
1da177e4 LT |
254 | # svc 0: system call number in %r1 |
255 | cl %r1,BASED(.Lnr_syscalls) | |
256 | bnl BASED(sysc_nr_ok) | |
25d83cbf | 257 | lr %r7,%r1 # copy svc number to %r7 |
1da177e4 | 258 | sysc_nr_ok: |
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 |
baa07158 | 263 | mvc SP_ARGS(4,%r15),SP_R7(%r15) |
d882b172 | 264 | l %r8,0(%r7,%r8) # get system call addr. |
25d83cbf HC |
265 | bnz BASED(sysc_tracesys) |
266 | basr %r14,%r8 # call sys_xxxx | |
267 | st %r2,SP_R2(%r15) # store return value (change R2 on stack) | |
1da177e4 LT |
268 | |
269 | sysc_return: | |
6a2df3a8 MS |
270 | LOCKDEP_SYS_EXIT |
271 | sysc_tif: | |
1da177e4 LT |
272 | tm __TI_flags+3(%r9),_TIF_WORK_SVC |
273 | bnz BASED(sysc_work) # there is work to do (signals etc.) | |
411788ea | 274 | sysc_restore: |
25d83cbf | 275 | RESTORE_ALL __LC_RETURN_PSW,1 |
411788ea HC |
276 | sysc_done: |
277 | ||
1da177e4 | 278 | # |
43d399d2 | 279 | # There is work to do, but first we need to check if we return to userspace. |
1da177e4 LT |
280 | # |
281 | sysc_work: | |
2688905e MS |
282 | tm SP_PSW+1(%r15),0x01 # returning to user ? |
283 | bno BASED(sysc_restore) | |
43d399d2 MS |
284 | |
285 | # | |
286 | # One of the work bits is on. Find out which one. | |
287 | # | |
6a2df3a8 | 288 | sysc_work_tif: |
77fa2245 HC |
289 | tm __TI_flags+3(%r9),_TIF_MCCK_PENDING |
290 | bo BASED(sysc_mcck_pending) | |
1da177e4 LT |
291 | tm __TI_flags+3(%r9),_TIF_NEED_RESCHED |
292 | bo BASED(sysc_reschedule) | |
02a029b3 | 293 | tm __TI_flags+3(%r9),_TIF_SIGPENDING |
43d399d2 | 294 | bo BASED(sysc_sigpending) |
753c4dd6 | 295 | tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME |
43d399d2 | 296 | bo BASED(sysc_notify_resume) |
1da177e4 LT |
297 | tm __TI_flags+3(%r9),_TIF_RESTART_SVC |
298 | bo BASED(sysc_restart) | |
299 | tm __TI_flags+3(%r9),_TIF_SINGLE_STEP | |
300 | bo BASED(sysc_singlestep) | |
43d399d2 | 301 | b BASED(sysc_return) # beware of critical section cleanup |
1da177e4 LT |
302 | |
303 | # | |
304 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
305 | # |
306 | sysc_reschedule: | |
307 | l %r1,BASED(.Lschedule) | |
6a2df3a8 | 308 | la %r14,BASED(sysc_return) |
25d83cbf | 309 | br %r1 # call scheduler |
1da177e4 | 310 | |
77fa2245 HC |
311 | # |
312 | # _TIF_MCCK_PENDING is set, call handler | |
313 | # | |
314 | sysc_mcck_pending: | |
315 | l %r1,BASED(.Ls390_handle_mcck) | |
6a2df3a8 | 316 | la %r14,BASED(sysc_return) |
77fa2245 HC |
317 | br %r1 # TIF bit will be cleared by handler |
318 | ||
1da177e4 | 319 | # |
02a029b3 | 320 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 321 | # |
25d83cbf | 322 | sysc_sigpending: |
1da177e4 | 323 | ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP |
25d83cbf HC |
324 | la %r2,SP_PTREGS(%r15) # load pt_regs |
325 | l %r1,BASED(.Ldo_signal) | |
326 | basr %r14,%r1 # call do_signal | |
1da177e4 LT |
327 | tm __TI_flags+3(%r9),_TIF_RESTART_SVC |
328 | bo BASED(sysc_restart) | |
329 | tm __TI_flags+3(%r9),_TIF_SINGLE_STEP | |
330 | bo BASED(sysc_singlestep) | |
6a2df3a8 | 331 | b BASED(sysc_return) |
1da177e4 | 332 | |
753c4dd6 MS |
333 | # |
334 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
335 | # | |
336 | sysc_notify_resume: | |
337 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
338 | l %r1,BASED(.Ldo_notify_resume) | |
6a2df3a8 | 339 | la %r14,BASED(sysc_return) |
753c4dd6 MS |
340 | br %r1 # call do_notify_resume |
341 | ||
342 | ||
1da177e4 LT |
343 | # |
344 | # _TIF_RESTART_SVC is set, set up registers and restart svc | |
345 | # | |
346 | sysc_restart: | |
347 | ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC | |
25d83cbf | 348 | l %r7,SP_R2(%r15) # load new svc number |
1da177e4 | 349 | mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument |
25d83cbf | 350 | lm %r2,%r6,SP_R2(%r15) # load svc arguments |
baa07158 | 351 | b BASED(sysc_nr_ok) # restart svc |
1da177e4 LT |
352 | |
353 | # | |
354 | # _TIF_SINGLE_STEP is set, call do_single_step | |
355 | # | |
356 | sysc_singlestep: | |
357 | ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP | |
59da2139 MS |
358 | mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check |
359 | mvi SP_SVCNR+1(%r15),0xff | |
1da177e4 LT |
360 | la %r2,SP_PTREGS(%r15) # address of register-save area |
361 | l %r1,BASED(.Lhandle_per) # load adr. of per handler | |
6a2df3a8 | 362 | la %r14,BASED(sysc_return) # load adr. of system return |
1da177e4 LT |
363 | br %r1 # branch to do_single_step |
364 | ||
1da177e4 | 365 | # |
753c4dd6 MS |
366 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
367 | # and after the system call | |
1da177e4 LT |
368 | # |
369 | sysc_tracesys: | |
753c4dd6 | 370 | l %r1,BASED(.Ltrace_entry) |
25d83cbf | 371 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 LT |
372 | la %r3,0 |
373 | srl %r7,2 | |
374 | st %r7,SP_R2(%r15) | |
375 | basr %r14,%r1 | |
753c4dd6 | 376 | cl %r2,BASED(.Lnr_syscalls) |
1da177e4 | 377 | bnl BASED(sysc_tracenogo) |
d882b172 | 378 | l %r8,BASED(.Lsysc_table) |
753c4dd6 | 379 | lr %r7,%r2 |
59da2139 | 380 | sll %r7,2 # svc number *4 |
d882b172 | 381 | l %r8,0(%r7,%r8) |
1da177e4 LT |
382 | sysc_tracego: |
383 | lm %r3,%r6,SP_R3(%r15) | |
baa07158 | 384 | mvc SP_ARGS(4,%r15),SP_R7(%r15) |
1da177e4 | 385 | l %r2,SP_ORIG_R2(%r15) |
25d83cbf HC |
386 | basr %r14,%r8 # call sys_xxx |
387 | st %r2,SP_R2(%r15) # store return value | |
1da177e4 | 388 | sysc_tracenogo: |
bcf5cef7 | 389 | tm __TI_flags+2(%r9),_TIF_SYSCALL |
25d83cbf | 390 | bz BASED(sysc_return) |
753c4dd6 | 391 | l %r1,BASED(.Ltrace_exit) |
25d83cbf | 392 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 LT |
393 | la %r14,BASED(sysc_return) |
394 | br %r1 | |
395 | ||
396 | # | |
397 | # a new process exits the kernel with ret_from_fork | |
398 | # | |
25d83cbf | 399 | .globl ret_from_fork |
1da177e4 LT |
400 | ret_from_fork: |
401 | l %r13,__LC_SVC_NEW_PSW+4 | |
402 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct | |
403 | tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? | |
404 | bo BASED(0f) | |
405 | st %r15,SP_R15(%r15) # store stack pointer for new kthread | |
25d83cbf HC |
406 | 0: l %r1,BASED(.Lschedtail) |
407 | basr %r14,%r1 | |
1f194a4c | 408 | TRACE_IRQS_ON |
25d83cbf | 409 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
8f2961c3 | 410 | b BASED(sysc_tracenogo) |
1da177e4 LT |
411 | |
412 | # | |
03ff9a23 MS |
413 | # kernel_execve function needs to deal with pt_regs that is not |
414 | # at the usual place | |
1da177e4 | 415 | # |
03ff9a23 MS |
416 | .globl kernel_execve |
417 | kernel_execve: | |
418 | stm %r12,%r15,48(%r15) | |
419 | lr %r14,%r15 | |
420 | l %r13,__LC_SVC_NEW_PSW+4 | |
421 | s %r15,BASED(.Lc_spsize) | |
422 | st %r14,__SF_BACKCHAIN(%r15) | |
423 | la %r12,SP_PTREGS(%r15) | |
424 | xc 0(__PT_SIZE,%r12),0(%r12) | |
425 | l %r1,BASED(.Ldo_execve) | |
426 | lr %r5,%r12 | |
427 | basr %r14,%r1 | |
428 | ltr %r2,%r2 | |
429 | be BASED(0f) | |
430 | a %r15,BASED(.Lc_spsize) | |
431 | lm %r12,%r15,48(%r15) | |
432 | br %r14 | |
433 | # execve succeeded. | |
434 | 0: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts | |
435 | l %r15,__LC_KERNEL_STACK # load ksp | |
436 | s %r15,BASED(.Lc_spsize) # make room for registers & psw | |
437 | l %r9,__LC_THREAD_INFO | |
438 | mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs | |
439 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
440 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
441 | l %r1,BASED(.Lexecve_tail) | |
442 | basr %r14,%r1 | |
443 | b BASED(sysc_return) | |
1da177e4 LT |
444 | |
445 | /* | |
446 | * Program check handler routine | |
447 | */ | |
448 | ||
25d83cbf | 449 | .globl pgm_check_handler |
1da177e4 LT |
450 | pgm_check_handler: |
451 | /* | |
452 | * First we need to check for a special case: | |
453 | * Single stepping an instruction that disables the PER event mask will | |
454 | * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. | |
455 | * For a single stepped SVC the program check handler gets control after | |
456 | * the SVC new PSW has been loaded. But we want to execute the SVC first and | |
457 | * then handle the PER event. Therefore we update the SVC old PSW to point | |
458 | * to the pgm_check_handler and branch to the SVC handler after we checked | |
459 | * if we have to load the kernel stack register. | |
460 | * For every other possible cause for PER event without the PER mask set | |
461 | * we just ignore the PER event (FIXME: is there anything we have to do | |
462 | * for LPSW?). | |
463 | */ | |
c185b783 | 464 | stpt __LC_SYNC_ENTER_TIMER |
1da177e4 | 465 | SAVE_ALL_BASE __LC_SAVE_AREA |
25d83cbf HC |
466 | tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception |
467 | bnz BASED(pgm_per) # got per exception -> special case | |
63b12246 | 468 | SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 469 | CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
1da177e4 LT |
470 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
471 | bz BASED(pgm_no_vtime) | |
472 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER | |
473 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
474 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
475 | pgm_no_vtime: | |
1da177e4 | 476 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
25d83cbf | 477 | l %r3,__LC_PGM_ILC # load program interruption code |
1e54622e MS |
478 | l %r4,__LC_TRANS_EXC_CODE |
479 | REENABLE_IRQS | |
1da177e4 LT |
480 | la %r8,0x7f |
481 | nr %r8,%r3 | |
482 | pgm_do_call: | |
25d83cbf HC |
483 | l %r7,BASED(.Ljump_table) |
484 | sll %r8,2 | |
485 | l %r7,0(%r8,%r7) # load address of handler routine | |
486 | la %r2,SP_PTREGS(%r15) # address of register-save area | |
6a2df3a8 MS |
487 | basr %r14,%r7 # branch to interrupt-handler |
488 | pgm_exit: | |
6a2df3a8 | 489 | b BASED(sysc_return) |
1da177e4 LT |
490 | |
491 | # | |
492 | # handle per exception | |
493 | # | |
494 | pgm_per: | |
25d83cbf HC |
495 | tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on |
496 | bnz BASED(pgm_per_std) # ok, normal per event from user space | |
1da177e4 | 497 | # ok its one of the special cases, now we need to find out which one |
25d83cbf HC |
498 | clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW |
499 | be BASED(pgm_svcper) | |
1da177e4 | 500 | # no interesting special case, ignore PER event |
25d83cbf HC |
501 | lm %r12,%r15,__LC_SAVE_AREA |
502 | lpsw 0x28 | |
1da177e4 LT |
503 | |
504 | # | |
505 | # Normal per exception | |
506 | # | |
507 | pgm_per_std: | |
63b12246 | 508 | SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 509 | CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
1da177e4 LT |
510 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
511 | bz BASED(pgm_no_vtime2) | |
512 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER | |
513 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
514 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
515 | pgm_no_vtime2: | |
1da177e4 LT |
516 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
517 | l %r1,__TI_task(%r9) | |
6a2df3a8 MS |
518 | tm SP_PSW+1(%r15),0x01 # kernel per event ? |
519 | bz BASED(kernel_per) | |
1da177e4 LT |
520 | mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID |
521 | mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS | |
522 | mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID | |
523 | oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP | |
25d83cbf | 524 | l %r3,__LC_PGM_ILC # load program interruption code |
1e54622e MS |
525 | l %r4,__LC_TRANS_EXC_CODE |
526 | REENABLE_IRQS | |
1da177e4 | 527 | la %r8,0x7f |
25d83cbf | 528 | nr %r8,%r3 # clear per-event-bit and ilc |
f5cdac27 HC |
529 | be BASED(pgm_exit2) # only per or per+check ? |
530 | l %r7,BASED(.Ljump_table) | |
531 | sll %r8,2 | |
532 | l %r7,0(%r8,%r7) # load address of handler routine | |
533 | la %r2,SP_PTREGS(%r15) # address of register-save area | |
534 | basr %r14,%r7 # branch to interrupt-handler | |
535 | pgm_exit2: | |
f5cdac27 | 536 | b BASED(sysc_return) |
1da177e4 LT |
537 | |
538 | # | |
539 | # it was a single stepped SVC that is causing all the trouble | |
540 | # | |
541 | pgm_svcper: | |
63b12246 | 542 | SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 543 | CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
1da177e4 LT |
544 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
545 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
546 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
547 | lh %r7,0x8a # get svc number from lowcore |
548 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct | |
bcc6525f CB |
549 | l %r8,__TI_task(%r9) |
550 | mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID | |
551 | mvc __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS | |
552 | mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID | |
1da177e4 LT |
553 | oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP |
554 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
6a2df3a8 | 555 | lm %r2,%r6,SP_R2(%r15) # load svc arguments |
1da177e4 LT |
556 | b BASED(sysc_do_svc) |
557 | ||
4ba069b8 MG |
558 | # |
559 | # per was called from kernel, must be kprobes | |
560 | # | |
561 | kernel_per: | |
9ec27080 | 562 | REENABLE_IRQS |
59da2139 MS |
563 | mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check |
564 | mvi SP_SVCNR+1(%r15),0xff | |
4ba069b8 MG |
565 | la %r2,SP_PTREGS(%r15) # address of register-save area |
566 | l %r1,BASED(.Lhandle_per) # load adr. of per handler | |
6a2df3a8 MS |
567 | basr %r14,%r1 # branch to do_single_step |
568 | b BASED(pgm_exit) | |
4ba069b8 | 569 | |
1da177e4 LT |
570 | /* |
571 | * IO interrupt handler routine | |
572 | */ | |
573 | ||
25d83cbf | 574 | .globl io_int_handler |
1da177e4 | 575 | io_int_handler: |
1da177e4 | 576 | stck __LC_INT_CLOCK |
9cfb9b3c | 577 | stpt __LC_ASYNC_ENTER_TIMER |
1da177e4 | 578 | SAVE_ALL_BASE __LC_SAVE_AREA+16 |
63b12246 | 579 | SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 |
77fa2245 | 580 | CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 |
1da177e4 LT |
581 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
582 | bz BASED(io_no_vtime) | |
583 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER | |
584 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
585 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
586 | io_no_vtime: | |
1f194a4c | 587 | TRACE_IRQS_OFF |
6a2df3a8 | 588 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
25d83cbf HC |
589 | l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ |
590 | la %r2,SP_PTREGS(%r15) # address of register-save area | |
591 | basr %r14,%r1 # branch to standard irq handler | |
1da177e4 | 592 | io_return: |
6a2df3a8 MS |
593 | LOCKDEP_SYS_EXIT |
594 | TRACE_IRQS_ON | |
595 | io_tif: | |
1da177e4 | 596 | tm __TI_flags+3(%r9),_TIF_WORK_INT |
25d83cbf | 597 | bnz BASED(io_work) # there is work to do (signals etc.) |
411788ea | 598 | io_restore: |
25d83cbf | 599 | RESTORE_ALL __LC_RETURN_PSW,0 |
ae6aa2ea | 600 | io_done: |
1da177e4 | 601 | |
2688905e | 602 | # |
43d399d2 MS |
603 | # There is work todo, find out in which context we have been interrupted: |
604 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
605 | # 2) if we return to kernel code and preemptive scheduling is enabled check | |
606 | # the preemption counter and if it is zero call preempt_schedule_irq | |
607 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
608 | # |
609 | io_work: | |
610 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
43d399d2 MS |
611 | bo BASED(io_work_user) # yes -> do resched & signal |
612 | #ifdef CONFIG_PREEMPT | |
2688905e | 613 | # check for preemptive scheduling |
1da177e4 | 614 | icm %r0,15,__TI_precount(%r9) |
2688905e | 615 | bnz BASED(io_restore) # preemption disabled |
6a2df3a8 MS |
616 | tm __TI_flags+3(%r9),_TIF_NEED_RESCHED |
617 | bno BASED(io_restore) | |
43d399d2 | 618 | # switch to kernel stack |
1da177e4 LT |
619 | l %r1,SP_R15(%r15) |
620 | s %r1,BASED(.Lc_spsize) | |
621 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 622 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
1da177e4 | 623 | lr %r15,%r1 |
6a2df3a8 MS |
624 | # TRACE_IRQS_ON already done at io_return, call |
625 | # TRACE_IRQS_OFF to keep things symmetrical | |
626 | TRACE_IRQS_OFF | |
b8e7a54c | 627 | l %r1,BASED(.Lpreempt_schedule_irq) |
6a2df3a8 MS |
628 | basr %r14,%r1 # call preempt_schedule_irq |
629 | b BASED(io_return) | |
630 | #else | |
43d399d2 | 631 | b BASED(io_restore) |
6a2df3a8 | 632 | #endif |
1da177e4 | 633 | |
43d399d2 MS |
634 | # |
635 | # Need to do work before returning to userspace, switch to kernel stack | |
636 | # | |
2688905e | 637 | io_work_user: |
1da177e4 LT |
638 | l %r1,__LC_KERNEL_STACK |
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 | 642 | lr %r15,%r1 |
6a2df3a8 | 643 | |
1da177e4 LT |
644 | # |
645 | # One of the work bits is on. Find out which one. | |
43d399d2 | 646 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
25d83cbf | 647 | # and _TIF_MCCK_PENDING |
1da177e4 | 648 | # |
6a2df3a8 | 649 | io_work_tif: |
77fa2245 | 650 | tm __TI_flags+3(%r9),_TIF_MCCK_PENDING |
25d83cbf | 651 | bo BASED(io_mcck_pending) |
1da177e4 LT |
652 | tm __TI_flags+3(%r9),_TIF_NEED_RESCHED |
653 | bo BASED(io_reschedule) | |
02a029b3 | 654 | tm __TI_flags+3(%r9),_TIF_SIGPENDING |
43d399d2 | 655 | bo BASED(io_sigpending) |
753c4dd6 | 656 | tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME |
43d399d2 MS |
657 | bo BASED(io_notify_resume) |
658 | b BASED(io_return) # beware of critical section cleanup | |
1da177e4 | 659 | |
77fa2245 HC |
660 | # |
661 | # _TIF_MCCK_PENDING is set, call handler | |
662 | # | |
663 | io_mcck_pending: | |
6a2df3a8 | 664 | # TRACE_IRQS_ON already done at io_return |
77fa2245 | 665 | l %r1,BASED(.Ls390_handle_mcck) |
b771aeac | 666 | basr %r14,%r1 # TIF bit will be cleared by handler |
6a2df3a8 MS |
667 | TRACE_IRQS_OFF |
668 | b BASED(io_return) | |
77fa2245 | 669 | |
1da177e4 LT |
670 | # |
671 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
672 | # |
673 | io_reschedule: | |
6a2df3a8 | 674 | # TRACE_IRQS_ON already done at io_return |
25d83cbf HC |
675 | l %r1,BASED(.Lschedule) |
676 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
677 | basr %r14,%r1 # call scheduler | |
678 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
411788ea | 679 | TRACE_IRQS_OFF |
6a2df3a8 | 680 | b BASED(io_return) |
1da177e4 LT |
681 | |
682 | # | |
02a029b3 | 683 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 684 | # |
25d83cbf | 685 | io_sigpending: |
6a2df3a8 | 686 | # TRACE_IRQS_ON already done at io_return |
25d83cbf HC |
687 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
688 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
689 | l %r1,BASED(.Ldo_signal) | |
690 | basr %r14,%r1 # call do_signal | |
691 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
411788ea | 692 | TRACE_IRQS_OFF |
6a2df3a8 | 693 | b BASED(io_return) |
1da177e4 | 694 | |
753c4dd6 MS |
695 | # |
696 | # _TIF_SIGPENDING is set, call do_signal | |
697 | # | |
698 | io_notify_resume: | |
6a2df3a8 | 699 | # TRACE_IRQS_ON already done at io_return |
753c4dd6 MS |
700 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
701 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
702 | l %r1,BASED(.Ldo_notify_resume) | |
703 | basr %r14,%r1 # call do_signal | |
704 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
705 | TRACE_IRQS_OFF | |
6a2df3a8 | 706 | b BASED(io_return) |
753c4dd6 | 707 | |
1da177e4 LT |
708 | /* |
709 | * External interrupt handler routine | |
710 | */ | |
711 | ||
25d83cbf | 712 | .globl ext_int_handler |
1da177e4 | 713 | ext_int_handler: |
1da177e4 | 714 | stck __LC_INT_CLOCK |
9cfb9b3c | 715 | stpt __LC_ASYNC_ENTER_TIMER |
1da177e4 | 716 | SAVE_ALL_BASE __LC_SAVE_AREA+16 |
63b12246 | 717 | SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 |
77fa2245 | 718 | CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 |
1da177e4 LT |
719 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
720 | bz BASED(ext_no_vtime) | |
721 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER | |
722 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
723 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
724 | ext_no_vtime: | |
1da177e4 | 725 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
1f194a4c | 726 | TRACE_IRQS_OFF |
25d83cbf | 727 | la %r2,SP_PTREGS(%r15) # address of register-save area |
f6649a7e MS |
728 | l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code |
729 | l %r4,__LC_EXT_PARAMS # get external parameters | |
1da177e4 LT |
730 | l %r1,BASED(.Ldo_extint) |
731 | basr %r14,%r1 | |
732 | b BASED(io_return) | |
733 | ||
ae6aa2ea MS |
734 | __critical_end: |
735 | ||
1da177e4 LT |
736 | /* |
737 | * Machine check handler routines | |
738 | */ | |
739 | ||
25d83cbf | 740 | .globl mcck_int_handler |
1da177e4 | 741 | mcck_int_handler: |
6377981f | 742 | stck __LC_MCCK_CLOCK |
77fa2245 HC |
743 | spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer |
744 | lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs | |
1da177e4 | 745 | SAVE_ALL_BASE __LC_SAVE_AREA+32 |
77fa2245 | 746 | la %r12,__LC_MCK_OLD_PSW |
25d83cbf | 747 | tm __LC_MCCK_CODE,0x80 # system damage? |
77fa2245 | 748 | bo BASED(mcck_int_main) # yes -> rest of mcck code invalid |
6377981f | 749 | mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA |
63b12246 MS |
750 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
751 | bo BASED(1f) | |
752 | la %r14,__LC_SYNC_ENTER_TIMER | |
753 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
754 | bl BASED(0f) | |
755 | la %r14,__LC_ASYNC_ENTER_TIMER | |
756 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
757 | bl BASED(0f) | |
758 | la %r14,__LC_EXIT_TIMER | |
759 | 0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER | |
760 | bl BASED(0f) | |
761 | la %r14,__LC_LAST_UPDATE_TIMER | |
762 | 0: spt 0(%r14) | |
6377981f | 763 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c185b783 | 764 | 1: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
77fa2245 HC |
765 | bno BASED(mcck_int_main) # no -> skip cleanup critical |
766 | tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit | |
767 | bnz BASED(mcck_int_main) # from user -> load async stack | |
768 | clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) | |
769 | bhe BASED(mcck_int_main) | |
770 | clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) | |
771 | bl BASED(mcck_int_main) | |
772 | l %r14,BASED(.Lcleanup_critical) | |
773 | basr %r14,%r14 | |
774 | mcck_int_main: | |
775 | l %r14,__LC_PANIC_STACK # are we already on the panic stack? | |
776 | slr %r14,%r15 | |
777 | sra %r14,PAGE_SHIFT | |
778 | be BASED(0f) | |
779 | l %r15,__LC_PANIC_STACK # load panic stack | |
780 | 0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 | |
25d83cbf | 781 | tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? |
ae6aa2ea | 782 | bno BASED(mcck_no_vtime) # no -> skip cleanup critical |
63b12246 | 783 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
ae6aa2ea | 784 | bz BASED(mcck_no_vtime) |
6377981f | 785 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER |
ae6aa2ea | 786 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER |
6377981f | 787 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER |
ae6aa2ea | 788 | mcck_no_vtime: |
77fa2245 HC |
789 | l %r9,__LC_THREAD_INFO # load pointer to thread_info struct |
790 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
25d83cbf HC |
791 | l %r1,BASED(.Ls390_mcck) |
792 | basr %r14,%r1 # call machine check handler | |
793 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
77fa2245 | 794 | bno BASED(mcck_return) |
25d83cbf | 795 | l %r1,__LC_KERNEL_STACK # switch to kernel stack |
77fa2245 HC |
796 | s %r1,BASED(.Lc_spsize) |
797 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 798 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
77fa2245 HC |
799 | lr %r15,%r1 |
800 | stosm __SF_EMPTY(%r15),0x04 # turn dat on | |
801 | tm __TI_flags+3(%r9),_TIF_MCCK_PENDING | |
802 | bno BASED(mcck_return) | |
1f194a4c | 803 | TRACE_IRQS_OFF |
77fa2245 HC |
804 | l %r1,BASED(.Ls390_handle_mcck) |
805 | basr %r14,%r1 # call machine check handler | |
1f194a4c | 806 | TRACE_IRQS_ON |
1da177e4 | 807 | mcck_return: |
63b12246 MS |
808 | mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW |
809 | ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit | |
63b12246 MS |
810 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
811 | bno BASED(0f) | |
812 | lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 | |
813 | stpt __LC_EXIT_TIMER | |
814 | lpsw __LC_RETURN_MCCK_PSW # back to caller | |
c185b783 | 815 | 0: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 |
63b12246 MS |
816 | lpsw __LC_RETURN_MCCK_PSW # back to caller |
817 | ||
25d83cbf | 818 | RESTORE_ALL __LC_RETURN_MCCK_PSW,0 |
1da177e4 | 819 | |
1da177e4 LT |
820 | /* |
821 | * Restart interruption handler, kick starter for additional CPUs | |
822 | */ | |
84b36a8e | 823 | #ifdef CONFIG_SMP |
2bc89b5e | 824 | __CPUINIT |
25d83cbf | 825 | .globl restart_int_handler |
1da177e4 | 826 | restart_int_handler: |
5b409ed1 MS |
827 | basr %r1,0 |
828 | restart_base: | |
829 | spt restart_vtime-restart_base(%r1) | |
830 | stck __LC_LAST_UPDATE_CLOCK | |
831 | mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) | |
832 | mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) | |
25d83cbf HC |
833 | l %r15,__LC_SAVE_AREA+60 # load ksp |
834 | lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs | |
835 | lam %a0,%a15,__LC_AREGS_SAVE_AREA | |
836 | lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone | |
5b409ed1 MS |
837 | l %r1,__LC_THREAD_INFO |
838 | mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) | |
839 | mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) | |
840 | xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER | |
25d83cbf HC |
841 | stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on |
842 | basr %r14,0 | |
843 | l %r14,restart_addr-.(%r14) | |
844 | br %r14 # branch to start_secondary | |
1da177e4 | 845 | restart_addr: |
25d83cbf | 846 | .long start_secondary |
5b409ed1 MS |
847 | .align 8 |
848 | restart_vtime: | |
849 | .long 0x7fffffff,0xffffffff | |
84b36a8e | 850 | .previous |
1da177e4 LT |
851 | #else |
852 | /* | |
853 | * If we do not run with SMP enabled, let the new CPU crash ... | |
854 | */ | |
25d83cbf | 855 | .globl restart_int_handler |
1da177e4 | 856 | restart_int_handler: |
25d83cbf | 857 | basr %r1,0 |
1da177e4 | 858 | restart_base: |
25d83cbf HC |
859 | lpsw restart_crash-restart_base(%r1) |
860 | .align 8 | |
1da177e4 | 861 | restart_crash: |
25d83cbf | 862 | .long 0x000a0000,0x00000000 |
1da177e4 LT |
863 | restart_go: |
864 | #endif | |
865 | ||
860dba45 MS |
866 | .section .kprobes.text, "ax" |
867 | ||
1da177e4 LT |
868 | #ifdef CONFIG_CHECK_STACK |
869 | /* | |
870 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
871 | * No need to properly save the registers, we are going to panic anyway. | |
872 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
873 | */ | |
874 | stack_overflow: | |
875 | l %r15,__LC_PANIC_STACK # change to panic stack | |
876 | sl %r15,BASED(.Lc_spsize) | |
877 | mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack | |
878 | stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack | |
879 | la %r1,__LC_SAVE_AREA | |
880 | ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? | |
881 | be BASED(0f) | |
882 | ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? | |
883 | be BASED(0f) | |
884 | la %r1,__LC_SAVE_AREA+16 | |
885 | 0: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack | |
25d83cbf | 886 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain |
1da177e4 | 887 | l %r1,BASED(1f) # branch to kernel_stack_overflow |
25d83cbf | 888 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 | 889 | br %r1 |
25d83cbf | 890 | 1: .long kernel_stack_overflow |
1da177e4 LT |
891 | #endif |
892 | ||
893 | cleanup_table_system_call: | |
894 | .long system_call + 0x80000000, sysc_do_svc + 0x80000000 | |
6a2df3a8 MS |
895 | cleanup_table_sysc_tif: |
896 | .long sysc_tif + 0x80000000, sysc_restore + 0x80000000 | |
897 | cleanup_table_sysc_restore: | |
898 | .long sysc_restore + 0x80000000, sysc_done + 0x80000000 | |
899 | cleanup_table_io_tif: | |
900 | .long io_tif + 0x80000000, io_restore + 0x80000000 | |
901 | cleanup_table_io_restore: | |
902 | .long io_restore + 0x80000000, io_done + 0x80000000 | |
1da177e4 LT |
903 | |
904 | cleanup_critical: | |
905 | clc 4(4,%r12),BASED(cleanup_table_system_call) | |
906 | bl BASED(0f) | |
907 | clc 4(4,%r12),BASED(cleanup_table_system_call+4) | |
908 | bl BASED(cleanup_system_call) | |
909 | 0: | |
6a2df3a8 | 910 | clc 4(4,%r12),BASED(cleanup_table_sysc_tif) |
1da177e4 | 911 | bl BASED(0f) |
6a2df3a8 MS |
912 | clc 4(4,%r12),BASED(cleanup_table_sysc_tif+4) |
913 | bl BASED(cleanup_sysc_tif) | |
1da177e4 | 914 | 0: |
6a2df3a8 | 915 | clc 4(4,%r12),BASED(cleanup_table_sysc_restore) |
1da177e4 | 916 | bl BASED(0f) |
6a2df3a8 MS |
917 | clc 4(4,%r12),BASED(cleanup_table_sysc_restore+4) |
918 | bl BASED(cleanup_sysc_restore) | |
63b12246 | 919 | 0: |
6a2df3a8 | 920 | clc 4(4,%r12),BASED(cleanup_table_io_tif) |
63b12246 | 921 | bl BASED(0f) |
6a2df3a8 MS |
922 | clc 4(4,%r12),BASED(cleanup_table_io_tif+4) |
923 | bl BASED(cleanup_io_tif) | |
ae6aa2ea | 924 | 0: |
6a2df3a8 | 925 | clc 4(4,%r12),BASED(cleanup_table_io_restore) |
ae6aa2ea | 926 | bl BASED(0f) |
6a2df3a8 MS |
927 | clc 4(4,%r12),BASED(cleanup_table_io_restore+4) |
928 | bl BASED(cleanup_io_restore) | |
1da177e4 LT |
929 | 0: |
930 | br %r14 | |
931 | ||
932 | cleanup_system_call: | |
933 | mvc __LC_RETURN_PSW(8),0(%r12) | |
1da177e4 LT |
934 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) |
935 | bh BASED(0f) | |
6377981f MS |
936 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
937 | c %r12,BASED(.Lmck_old_psw) | |
938 | be BASED(0f) | |
1da177e4 | 939 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER |
6377981f MS |
940 | 0: c %r12,BASED(.Lmck_old_psw) |
941 | la %r12,__LC_SAVE_AREA+32 | |
942 | be BASED(0f) | |
943 | la %r12,__LC_SAVE_AREA+16 | |
1da177e4 LT |
944 | 0: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) |
945 | bhe BASED(cleanup_vtime) | |
1da177e4 LT |
946 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) |
947 | bh BASED(0f) | |
ae6aa2ea MS |
948 | mvc __LC_SAVE_AREA(16),0(%r12) |
949 | 0: st %r13,4(%r12) | |
950 | st %r12,__LC_SAVE_AREA+48 # argh | |
63b12246 | 951 | SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
77fa2245 | 952 | CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
ae6aa2ea MS |
953 | l %r12,__LC_SAVE_AREA+48 # argh |
954 | st %r15,12(%r12) | |
1da177e4 | 955 | lh %r7,0x8a |
1da177e4 LT |
956 | cleanup_vtime: |
957 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) | |
958 | bhe BASED(cleanup_stime) | |
1da177e4 LT |
959 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
960 | cleanup_stime: | |
961 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) | |
962 | bh BASED(cleanup_update) | |
963 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
964 | cleanup_update: | |
965 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
966 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) |
967 | la %r12,__LC_RETURN_PSW | |
968 | br %r14 | |
969 | cleanup_system_call_insn: | |
970 | .long sysc_saveall + 0x80000000 | |
25d83cbf HC |
971 | .long system_call + 0x80000000 |
972 | .long sysc_vtime + 0x80000000 | |
973 | .long sysc_stime + 0x80000000 | |
974 | .long sysc_update + 0x80000000 | |
1da177e4 | 975 | |
6a2df3a8 | 976 | cleanup_sysc_tif: |
1da177e4 | 977 | mvc __LC_RETURN_PSW(4),0(%r12) |
6a2df3a8 | 978 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif) |
1da177e4 LT |
979 | la %r12,__LC_RETURN_PSW |
980 | br %r14 | |
981 | ||
6a2df3a8 MS |
982 | cleanup_sysc_restore: |
983 | clc 4(4,%r12),BASED(cleanup_sysc_restore_insn) | |
ae6aa2ea | 984 | be BASED(2f) |
6377981f MS |
985 | mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER |
986 | c %r12,BASED(.Lmck_old_psw) | |
987 | be BASED(0f) | |
1da177e4 | 988 | mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER |
6377981f | 989 | 0: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4) |
ae6aa2ea | 990 | be BASED(2f) |
1da177e4 | 991 | mvc __LC_RETURN_PSW(8),SP_PSW(%r15) |
ae6aa2ea | 992 | c %r12,BASED(.Lmck_old_psw) |
6377981f MS |
993 | la %r12,__LC_SAVE_AREA+32 |
994 | be BASED(1f) | |
995 | la %r12,__LC_SAVE_AREA+16 | |
996 | 1: mvc 0(16,%r12),SP_R12(%r15) | |
997 | lm %r0,%r11,SP_R0(%r15) | |
1da177e4 | 998 | l %r15,SP_R15(%r15) |
ae6aa2ea | 999 | 2: la %r12,__LC_RETURN_PSW |
1da177e4 | 1000 | br %r14 |
6a2df3a8 | 1001 | cleanup_sysc_restore_insn: |
411788ea | 1002 | .long sysc_done - 4 + 0x80000000 |
411788ea | 1003 | .long sysc_done - 8 + 0x80000000 |
1da177e4 | 1004 | |
6a2df3a8 | 1005 | cleanup_io_tif: |
176b1803 | 1006 | mvc __LC_RETURN_PSW(4),0(%r12) |
6a2df3a8 | 1007 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif) |
176b1803 MS |
1008 | la %r12,__LC_RETURN_PSW |
1009 | br %r14 | |
1010 | ||
6a2df3a8 MS |
1011 | cleanup_io_restore: |
1012 | clc 4(4,%r12),BASED(cleanup_io_restore_insn) | |
6377981f MS |
1013 | be BASED(1f) |
1014 | mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER | |
6a2df3a8 | 1015 | clc 4(4,%r12),BASED(cleanup_io_restore_insn+4) |
6377981f | 1016 | be BASED(1f) |
ae6aa2ea | 1017 | mvc __LC_RETURN_PSW(8),SP_PSW(%r15) |
ae6aa2ea | 1018 | mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) |
6377981f | 1019 | lm %r0,%r11,SP_R0(%r15) |
ae6aa2ea | 1020 | l %r15,SP_R15(%r15) |
6377981f | 1021 | 1: la %r12,__LC_RETURN_PSW |
ae6aa2ea | 1022 | br %r14 |
6a2df3a8 | 1023 | cleanup_io_restore_insn: |
411788ea | 1024 | .long io_done - 4 + 0x80000000 |
411788ea | 1025 | .long io_done - 8 + 0x80000000 |
ae6aa2ea | 1026 | |
1da177e4 LT |
1027 | /* |
1028 | * Integer constants | |
1029 | */ | |
25d83cbf HC |
1030 | .align 4 |
1031 | .Lc_spsize: .long SP_SIZE | |
1032 | .Lc_overhead: .long STACK_FRAME_OVERHEAD | |
25d83cbf HC |
1033 | .Lnr_syscalls: .long NR_syscalls |
1034 | .L0x018: .short 0x018 | |
1035 | .L0x020: .short 0x020 | |
1036 | .L0x028: .short 0x028 | |
1037 | .L0x030: .short 0x030 | |
1038 | .L0x038: .short 0x038 | |
1039 | .Lc_1: .long 1 | |
1da177e4 LT |
1040 | |
1041 | /* | |
1042 | * Symbol constants | |
1043 | */ | |
25d83cbf | 1044 | .Ls390_mcck: .long s390_do_machine_check |
77fa2245 | 1045 | .Ls390_handle_mcck: |
25d83cbf HC |
1046 | .long s390_handle_mcck |
1047 | .Lmck_old_psw: .long __LC_MCK_OLD_PSW | |
1048 | .Ldo_IRQ: .long do_IRQ | |
1049 | .Ldo_extint: .long do_extint | |
1050 | .Ldo_signal: .long do_signal | |
753c4dd6 MS |
1051 | .Ldo_notify_resume: |
1052 | .long do_notify_resume | |
25d83cbf | 1053 | .Lhandle_per: .long do_single_step |
03ff9a23 MS |
1054 | .Ldo_execve: .long do_execve |
1055 | .Lexecve_tail: .long execve_tail | |
25d83cbf HC |
1056 | .Ljump_table: .long pgm_check_table |
1057 | .Lschedule: .long schedule | |
ab1809b4 | 1058 | #ifdef CONFIG_PREEMPT |
b8e7a54c HC |
1059 | .Lpreempt_schedule_irq: |
1060 | .long preempt_schedule_irq | |
ab1809b4 | 1061 | #endif |
753c4dd6 MS |
1062 | .Ltrace_entry: .long do_syscall_trace_enter |
1063 | .Ltrace_exit: .long do_syscall_trace_exit | |
25d83cbf HC |
1064 | .Lschedtail: .long schedule_tail |
1065 | .Lsysc_table: .long sys_call_table | |
1f194a4c | 1066 | #ifdef CONFIG_TRACE_IRQFLAGS |
50bec4ce HC |
1067 | .Ltrace_irq_on_caller: |
1068 | .long trace_hardirqs_on_caller | |
1069 | .Ltrace_irq_off_caller: | |
1070 | .long trace_hardirqs_off_caller | |
af4c6874 HC |
1071 | #endif |
1072 | #ifdef CONFIG_LOCKDEP | |
523b44cf HC |
1073 | .Llockdep_sys_exit: |
1074 | .long lockdep_sys_exit | |
1f194a4c | 1075 | #endif |
1da177e4 | 1076 | .Lcritical_start: |
25d83cbf | 1077 | .long __critical_start + 0x80000000 |
1da177e4 | 1078 | .Lcritical_end: |
25d83cbf | 1079 | .long __critical_end + 0x80000000 |
1da177e4 | 1080 | .Lcleanup_critical: |
25d83cbf | 1081 | .long cleanup_critical |
1da177e4 | 1082 | |
25d83cbf | 1083 | .section .rodata, "a" |
1da177e4 | 1084 | #define SYSCALL(esa,esame,emu) .long esa |
9bf1226b | 1085 | .globl sys_call_table |
1da177e4 LT |
1086 | sys_call_table: |
1087 | #include "syscalls.S" | |
1088 | #undef SYSCALL |