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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 | ||
1da177e4 | 12 | #include <linux/linkage.h> |
2bc89b5e | 13 | #include <linux/init.h> |
1da177e4 | 14 | #include <asm/cache.h> |
1da177e4 LT |
15 | #include <asm/errno.h> |
16 | #include <asm/ptrace.h> | |
17 | #include <asm/thread_info.h> | |
0013a854 | 18 | #include <asm/asm-offsets.h> |
1da177e4 LT |
19 | #include <asm/unistd.h> |
20 | #include <asm/page.h> | |
21 | ||
22 | /* | |
23 | * Stack layout for the system_call stack entry. | |
24 | * The first few entries are identical to the user_regs_struct. | |
25 | */ | |
25d83cbf HC |
26 | SP_PTREGS = STACK_FRAME_OVERHEAD |
27 | SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS | |
28 | SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW | |
29 | SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS | |
30 | SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 | |
31 | SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 | |
32 | SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 | |
33 | SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 | |
34 | SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 | |
35 | SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 | |
36 | SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 | |
37 | SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 | |
38 | SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 | |
39 | SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 | |
40 | SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 | |
41 | SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 | |
42 | SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 | |
43 | SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 | |
44 | SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 | |
45 | SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 | |
46 | SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC | |
59da2139 | 47 | SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR |
25d83cbf | 48 | SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE |
1da177e4 | 49 | |
753c4dd6 | 50 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
5e9a2692 | 51 | _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_PER_TRAP ) |
753c4dd6 | 52 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 53 | _TIF_MCCK_PENDING) |
9bf1226b | 54 | _TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ |
66700001 | 55 | _TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8) |
1da177e4 LT |
56 | |
57 | STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER | |
58 | STACK_SIZE = 1 << STACK_SHIFT | |
59 | ||
60 | #define BASED(name) name-system_call(%r13) | |
61 | ||
1f194a4c HC |
62 | #ifdef CONFIG_TRACE_IRQFLAGS |
63 | .macro TRACE_IRQS_ON | |
50bec4ce HC |
64 | basr %r2,%r0 |
65 | l %r1,BASED(.Ltrace_irq_on_caller) | |
1f194a4c HC |
66 | basr %r14,%r1 |
67 | .endm | |
68 | ||
69 | .macro TRACE_IRQS_OFF | |
50bec4ce HC |
70 | basr %r2,%r0 |
71 | l %r1,BASED(.Ltrace_irq_off_caller) | |
1f194a4c HC |
72 | basr %r14,%r1 |
73 | .endm | |
74 | #else | |
75 | #define TRACE_IRQS_ON | |
76 | #define TRACE_IRQS_OFF | |
411788ea HC |
77 | #endif |
78 | ||
79 | #ifdef CONFIG_LOCKDEP | |
80 | .macro LOCKDEP_SYS_EXIT | |
81 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
82 | jz 0f | |
83 | l %r1,BASED(.Llockdep_sys_exit) | |
84 | basr %r14,%r1 | |
85 | 0: | |
86 | .endm | |
87 | #else | |
523b44cf | 88 | #define LOCKDEP_SYS_EXIT |
1f194a4c HC |
89 | #endif |
90 | ||
1da177e4 LT |
91 | /* |
92 | * Register usage in interrupt handlers: | |
93 | * R9 - pointer to current task structure | |
94 | * R13 - pointer to literal pool | |
95 | * R14 - return register for function calls | |
96 | * R15 - kernel stack pointer | |
97 | */ | |
98 | ||
25d83cbf | 99 | .macro UPDATE_VTIME lc_from,lc_to,lc_sum |
1da177e4 LT |
100 | lm %r10,%r11,\lc_from |
101 | sl %r10,\lc_to | |
102 | sl %r11,\lc_to+4 | |
103 | bc 3,BASED(0f) | |
104 | sl %r10,BASED(.Lc_1) | |
105 | 0: al %r10,\lc_sum | |
106 | al %r11,\lc_sum+4 | |
107 | bc 12,BASED(1f) | |
108 | al %r10,BASED(.Lc_1) | |
109 | 1: stm %r10,%r11,\lc_sum | |
110 | .endm | |
1da177e4 | 111 | |
1de3447a | 112 | .macro SAVE_ALL_SVC psworg,savearea |
1da177e4 LT |
113 | stm %r12,%r15,\savearea |
114 | l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 | |
1de3447a MS |
115 | l %r15,__LC_KERNEL_STACK # problem state -> load ksp |
116 | s %r15,BASED(.Lc_spsize) # make room for registers & psw | |
1da177e4 LT |
117 | .endm |
118 | ||
1de3447a MS |
119 | .macro SAVE_ALL_BASE savearea |
120 | stm %r12,%r15,\savearea | |
121 | l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 | |
987ad70a MS |
122 | .endm |
123 | ||
1de3447a | 124 | .macro SAVE_ALL_PGM psworg,savearea |
1da177e4 | 125 | tm \psworg+1,0x01 # test problem state bit |
63b12246 | 126 | #ifdef CONFIG_CHECK_STACK |
1de3447a MS |
127 | bnz BASED(1f) |
128 | tml %r15,STACK_SIZE - CONFIG_STACK_GUARD | |
129 | bnz BASED(2f) | |
130 | la %r12,\psworg | |
131 | b BASED(stack_overflow) | |
132 | #else | |
133 | bz BASED(2f) | |
63b12246 | 134 | #endif |
1de3447a MS |
135 | 1: l %r15,__LC_KERNEL_STACK # problem state -> load ksp |
136 | 2: s %r15,BASED(.Lc_spsize) # make room for registers & psw | |
63b12246 MS |
137 | .endm |
138 | ||
139 | .macro SAVE_ALL_ASYNC psworg,savearea | |
1de3447a MS |
140 | stm %r12,%r15,\savearea |
141 | l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 | |
63b12246 | 142 | la %r12,\psworg |
1da177e4 LT |
143 | tm \psworg+1,0x01 # test problem state bit |
144 | bnz BASED(1f) # from user -> load async stack | |
145 | clc \psworg+4(4),BASED(.Lcritical_end) | |
146 | bhe BASED(0f) | |
147 | clc \psworg+4(4),BASED(.Lcritical_start) | |
148 | bl BASED(0f) | |
149 | l %r14,BASED(.Lcleanup_critical) | |
150 | basr %r14,%r14 | |
6add9f7f | 151 | tm 1(%r12),0x01 # retest problem state after cleanup |
1da177e4 LT |
152 | bnz BASED(1f) |
153 | 0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? | |
154 | slr %r14,%r15 | |
155 | sra %r14,STACK_SHIFT | |
1da177e4 | 156 | #ifdef CONFIG_CHECK_STACK |
1de3447a MS |
157 | bnz BASED(1f) |
158 | tml %r15,STACK_SIZE - CONFIG_STACK_GUARD | |
159 | bnz BASED(2f) | |
160 | b BASED(stack_overflow) | |
161 | #else | |
162 | bz BASED(2f) | |
1da177e4 | 163 | #endif |
1de3447a MS |
164 | 1: l %r15,__LC_ASYNC_STACK |
165 | 2: s %r15,BASED(.Lc_spsize) # make room for registers & psw | |
77fa2245 HC |
166 | .endm |
167 | ||
1de3447a MS |
168 | .macro CREATE_STACK_FRAME savearea |
169 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) | |
1da177e4 | 170 | st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 |
1da177e4 | 171 | mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack |
1de3447a | 172 | stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack |
1da177e4 LT |
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 |
5e9a2692 MS |
203 | 0: l %r4,__THREAD_info(%r2) # get thread_info of prev |
204 | l %r5,__THREAD_info(%r3) # get thread_info of next | |
77fa2245 | 205 | tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? |
5e9a2692 MS |
206 | bz 1f-0b(%r1) |
207 | ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
208 | oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next | |
209 | 1: stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task | |
210 | st %r15,__THREAD_ksp(%r2) # store kernel stack of prev | |
211 | l %r15,__THREAD_ksp(%r3) # load kernel stack of next | |
212 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
213 | lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task | |
214 | st %r3,__LC_CURRENT # store task struct of next | |
215 | st %r5,__LC_THREAD_INFO # store thread info of next | |
216 | ahi %r5,STACK_SIZE # end of kernel stack of next | |
217 | st %r5,__LC_KERNEL_STACK # store end of kernel stack | |
1da177e4 LT |
218 | br %r14 |
219 | ||
220 | __critical_start: | |
221 | /* | |
222 | * SVC interrupt handler routine. System calls are synchronous events and | |
223 | * are executed with interrupts enabled. | |
224 | */ | |
225 | ||
25d83cbf | 226 | .globl system_call |
1da177e4 | 227 | system_call: |
c185b783 | 228 | stpt __LC_SYNC_ENTER_TIMER |
1da177e4 | 229 | sysc_saveall: |
987ad70a | 230 | SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
1de3447a MS |
231 | CREATE_STACK_FRAME __LC_SAVE_AREA |
232 | mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW | |
233 | mvc SP_ILC(4,%r15),__LC_SVC_ILC | |
234 | l %r12,__LC_THREAD_INFO # load pointer to thread_info struct | |
1da177e4 | 235 | sysc_vtime: |
1da177e4 LT |
236 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
237 | sysc_stime: | |
238 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
239 | sysc_update: | |
240 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 | 241 | sysc_do_svc: |
1de3447a MS |
242 | xr %r7,%r7 |
243 | icm %r7,3,SP_SVCNR(%r15) # load svc number and test for svc 0 | |
25d83cbf | 244 | bnz BASED(sysc_nr_ok) # svc number > 0 |
1da177e4 LT |
245 | # svc 0: system call number in %r1 |
246 | cl %r1,BASED(.Lnr_syscalls) | |
247 | bnl BASED(sysc_nr_ok) | |
1de3447a | 248 | sth %r1,SP_SVCNR(%r15) |
25d83cbf | 249 | lr %r7,%r1 # copy svc number to %r7 |
1da177e4 | 250 | sysc_nr_ok: |
59da2139 | 251 | sll %r7,2 # svc number *4 |
1de3447a MS |
252 | l %r10,BASED(.Lsysc_table) |
253 | tm __TI_flags+2(%r12),_TIF_SYSCALL | |
baa07158 | 254 | mvc SP_ARGS(4,%r15),SP_R7(%r15) |
1de3447a | 255 | l %r8,0(%r7,%r10) # get system call addr. |
25d83cbf HC |
256 | bnz BASED(sysc_tracesys) |
257 | basr %r14,%r8 # call sys_xxxx | |
258 | st %r2,SP_R2(%r15) # store return value (change R2 on stack) | |
1da177e4 LT |
259 | |
260 | sysc_return: | |
6a2df3a8 MS |
261 | LOCKDEP_SYS_EXIT |
262 | sysc_tif: | |
1de3447a | 263 | tm __TI_flags+3(%r12),_TIF_WORK_SVC |
1da177e4 | 264 | bnz BASED(sysc_work) # there is work to do (signals etc.) |
411788ea | 265 | sysc_restore: |
25d83cbf | 266 | RESTORE_ALL __LC_RETURN_PSW,1 |
411788ea HC |
267 | sysc_done: |
268 | ||
1da177e4 | 269 | # |
43d399d2 | 270 | # There is work to do, but first we need to check if we return to userspace. |
1da177e4 LT |
271 | # |
272 | sysc_work: | |
2688905e MS |
273 | tm SP_PSW+1(%r15),0x01 # returning to user ? |
274 | bno BASED(sysc_restore) | |
43d399d2 MS |
275 | |
276 | # | |
277 | # One of the work bits is on. Find out which one. | |
278 | # | |
6a2df3a8 | 279 | sysc_work_tif: |
1de3447a | 280 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
77fa2245 | 281 | bo BASED(sysc_mcck_pending) |
1de3447a | 282 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
1da177e4 | 283 | bo BASED(sysc_reschedule) |
1de3447a | 284 | tm __TI_flags+3(%r12),_TIF_SIGPENDING |
43d399d2 | 285 | bo BASED(sysc_sigpending) |
1de3447a | 286 | tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME |
43d399d2 | 287 | bo BASED(sysc_notify_resume) |
1de3447a | 288 | tm __TI_flags+3(%r12),_TIF_RESTART_SVC |
1da177e4 | 289 | bo BASED(sysc_restart) |
5e9a2692 | 290 | tm __TI_flags+3(%r12),_TIF_PER_TRAP |
1da177e4 | 291 | bo BASED(sysc_singlestep) |
43d399d2 | 292 | b BASED(sysc_return) # beware of critical section cleanup |
1da177e4 LT |
293 | |
294 | # | |
295 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
296 | # |
297 | sysc_reschedule: | |
298 | l %r1,BASED(.Lschedule) | |
6a2df3a8 | 299 | la %r14,BASED(sysc_return) |
25d83cbf | 300 | br %r1 # call scheduler |
1da177e4 | 301 | |
77fa2245 HC |
302 | # |
303 | # _TIF_MCCK_PENDING is set, call handler | |
304 | # | |
305 | sysc_mcck_pending: | |
306 | l %r1,BASED(.Ls390_handle_mcck) | |
6a2df3a8 | 307 | la %r14,BASED(sysc_return) |
77fa2245 HC |
308 | br %r1 # TIF bit will be cleared by handler |
309 | ||
1da177e4 | 310 | # |
02a029b3 | 311 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 312 | # |
25d83cbf | 313 | sysc_sigpending: |
5e9a2692 | 314 | ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP |
25d83cbf HC |
315 | la %r2,SP_PTREGS(%r15) # load pt_regs |
316 | l %r1,BASED(.Ldo_signal) | |
317 | basr %r14,%r1 # call do_signal | |
1de3447a | 318 | tm __TI_flags+3(%r12),_TIF_RESTART_SVC |
1da177e4 | 319 | bo BASED(sysc_restart) |
5e9a2692 | 320 | tm __TI_flags+3(%r12),_TIF_PER_TRAP |
1da177e4 | 321 | bo BASED(sysc_singlestep) |
6a2df3a8 | 322 | b BASED(sysc_return) |
1da177e4 | 323 | |
753c4dd6 MS |
324 | # |
325 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
326 | # | |
327 | sysc_notify_resume: | |
328 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
329 | l %r1,BASED(.Ldo_notify_resume) | |
6a2df3a8 | 330 | la %r14,BASED(sysc_return) |
753c4dd6 MS |
331 | br %r1 # call do_notify_resume |
332 | ||
333 | ||
1da177e4 LT |
334 | # |
335 | # _TIF_RESTART_SVC is set, set up registers and restart svc | |
336 | # | |
337 | sysc_restart: | |
1de3447a | 338 | ni __TI_flags+3(%r12),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC |
25d83cbf | 339 | l %r7,SP_R2(%r15) # load new svc number |
1da177e4 | 340 | mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument |
25d83cbf | 341 | lm %r2,%r6,SP_R2(%r15) # load svc arguments |
1de3447a | 342 | sth %r7,SP_SVCNR(%r15) |
baa07158 | 343 | b BASED(sysc_nr_ok) # restart svc |
1da177e4 LT |
344 | |
345 | # | |
5e9a2692 | 346 | # _TIF_PER_TRAP is set, call do_per_trap |
1da177e4 LT |
347 | # |
348 | sysc_singlestep: | |
5e9a2692 | 349 | ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP |
1de3447a | 350 | xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number |
1da177e4 LT |
351 | la %r2,SP_PTREGS(%r15) # address of register-save area |
352 | l %r1,BASED(.Lhandle_per) # load adr. of per handler | |
6a2df3a8 | 353 | la %r14,BASED(sysc_return) # load adr. of system return |
5e9a2692 | 354 | br %r1 # branch to do_per_trap |
1da177e4 | 355 | |
1da177e4 | 356 | # |
753c4dd6 MS |
357 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
358 | # and after the system call | |
1da177e4 LT |
359 | # |
360 | sysc_tracesys: | |
753c4dd6 | 361 | l %r1,BASED(.Ltrace_entry) |
25d83cbf | 362 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 | 363 | la %r3,0 |
1de3447a MS |
364 | xr %r0,%r0 |
365 | icm %r0,3,SP_SVCNR(%r15) | |
366 | st %r0,SP_R2(%r15) | |
1da177e4 | 367 | basr %r14,%r1 |
753c4dd6 | 368 | cl %r2,BASED(.Lnr_syscalls) |
1da177e4 | 369 | bnl BASED(sysc_tracenogo) |
753c4dd6 | 370 | lr %r7,%r2 |
59da2139 | 371 | sll %r7,2 # svc number *4 |
1de3447a | 372 | l %r8,0(%r7,%r10) |
1da177e4 LT |
373 | sysc_tracego: |
374 | lm %r3,%r6,SP_R3(%r15) | |
baa07158 | 375 | mvc SP_ARGS(4,%r15),SP_R7(%r15) |
1da177e4 | 376 | l %r2,SP_ORIG_R2(%r15) |
25d83cbf HC |
377 | basr %r14,%r8 # call sys_xxx |
378 | st %r2,SP_R2(%r15) # store return value | |
1da177e4 | 379 | sysc_tracenogo: |
1de3447a | 380 | tm __TI_flags+2(%r12),_TIF_SYSCALL |
25d83cbf | 381 | bz BASED(sysc_return) |
753c4dd6 | 382 | l %r1,BASED(.Ltrace_exit) |
25d83cbf | 383 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 LT |
384 | la %r14,BASED(sysc_return) |
385 | br %r1 | |
386 | ||
387 | # | |
388 | # a new process exits the kernel with ret_from_fork | |
389 | # | |
25d83cbf | 390 | .globl ret_from_fork |
1da177e4 LT |
391 | ret_from_fork: |
392 | l %r13,__LC_SVC_NEW_PSW+4 | |
1de3447a | 393 | l %r12,__LC_THREAD_INFO # load pointer to thread_info struct |
1da177e4 LT |
394 | tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? |
395 | bo BASED(0f) | |
396 | st %r15,SP_R15(%r15) # store stack pointer for new kthread | |
25d83cbf HC |
397 | 0: l %r1,BASED(.Lschedtail) |
398 | basr %r14,%r1 | |
1f194a4c | 399 | TRACE_IRQS_ON |
25d83cbf | 400 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
8f2961c3 | 401 | b BASED(sysc_tracenogo) |
1da177e4 LT |
402 | |
403 | # | |
03ff9a23 MS |
404 | # kernel_execve function needs to deal with pt_regs that is not |
405 | # at the usual place | |
1da177e4 | 406 | # |
03ff9a23 MS |
407 | .globl kernel_execve |
408 | kernel_execve: | |
409 | stm %r12,%r15,48(%r15) | |
410 | lr %r14,%r15 | |
411 | l %r13,__LC_SVC_NEW_PSW+4 | |
412 | s %r15,BASED(.Lc_spsize) | |
413 | st %r14,__SF_BACKCHAIN(%r15) | |
414 | la %r12,SP_PTREGS(%r15) | |
415 | xc 0(__PT_SIZE,%r12),0(%r12) | |
416 | l %r1,BASED(.Ldo_execve) | |
417 | lr %r5,%r12 | |
418 | basr %r14,%r1 | |
419 | ltr %r2,%r2 | |
420 | be BASED(0f) | |
421 | a %r15,BASED(.Lc_spsize) | |
422 | lm %r12,%r15,48(%r15) | |
423 | br %r14 | |
424 | # execve succeeded. | |
425 | 0: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts | |
426 | l %r15,__LC_KERNEL_STACK # load ksp | |
427 | s %r15,BASED(.Lc_spsize) # make room for registers & psw | |
03ff9a23 | 428 | mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs |
1de3447a | 429 | l %r12,__LC_THREAD_INFO |
03ff9a23 MS |
430 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) |
431 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
432 | l %r1,BASED(.Lexecve_tail) | |
433 | basr %r14,%r1 | |
434 | b BASED(sysc_return) | |
1da177e4 LT |
435 | |
436 | /* | |
437 | * Program check handler routine | |
438 | */ | |
439 | ||
25d83cbf | 440 | .globl pgm_check_handler |
1da177e4 LT |
441 | pgm_check_handler: |
442 | /* | |
443 | * First we need to check for a special case: | |
444 | * Single stepping an instruction that disables the PER event mask will | |
445 | * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. | |
446 | * For a single stepped SVC the program check handler gets control after | |
447 | * the SVC new PSW has been loaded. But we want to execute the SVC first and | |
448 | * then handle the PER event. Therefore we update the SVC old PSW to point | |
449 | * to the pgm_check_handler and branch to the SVC handler after we checked | |
450 | * if we have to load the kernel stack register. | |
451 | * For every other possible cause for PER event without the PER mask set | |
452 | * we just ignore the PER event (FIXME: is there anything we have to do | |
453 | * for LPSW?). | |
454 | */ | |
c185b783 | 455 | stpt __LC_SYNC_ENTER_TIMER |
1da177e4 | 456 | SAVE_ALL_BASE __LC_SAVE_AREA |
25d83cbf HC |
457 | tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception |
458 | bnz BASED(pgm_per) # got per exception -> special case | |
1de3447a MS |
459 | SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
460 | CREATE_STACK_FRAME __LC_SAVE_AREA | |
461 | xc SP_ILC(4,%r15),SP_ILC(%r15) | |
462 | mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW | |
463 | l %r12,__LC_THREAD_INFO # load pointer to thread_info struct | |
1da177e4 LT |
464 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
465 | bz BASED(pgm_no_vtime) | |
466 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER | |
467 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
468 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
469 | pgm_no_vtime: | |
25d83cbf | 470 | l %r3,__LC_PGM_ILC # load program interruption code |
1e54622e MS |
471 | l %r4,__LC_TRANS_EXC_CODE |
472 | REENABLE_IRQS | |
1da177e4 LT |
473 | la %r8,0x7f |
474 | nr %r8,%r3 | |
25d83cbf | 475 | sll %r8,2 |
1de3447a MS |
476 | l %r1,BASED(.Ljump_table) |
477 | l %r1,0(%r8,%r1) # load address of handler routine | |
25d83cbf | 478 | la %r2,SP_PTREGS(%r15) # address of register-save area |
1de3447a | 479 | basr %r14,%r1 # branch to interrupt-handler |
6a2df3a8 | 480 | pgm_exit: |
6a2df3a8 | 481 | b BASED(sysc_return) |
1da177e4 LT |
482 | |
483 | # | |
484 | # handle per exception | |
485 | # | |
486 | pgm_per: | |
25d83cbf HC |
487 | tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on |
488 | bnz BASED(pgm_per_std) # ok, normal per event from user space | |
1da177e4 | 489 | # ok its one of the special cases, now we need to find out which one |
25d83cbf HC |
490 | clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW |
491 | be BASED(pgm_svcper) | |
1da177e4 | 492 | # no interesting special case, ignore PER event |
25d83cbf HC |
493 | lm %r12,%r15,__LC_SAVE_AREA |
494 | lpsw 0x28 | |
1da177e4 LT |
495 | |
496 | # | |
497 | # Normal per exception | |
498 | # | |
499 | pgm_per_std: | |
1de3447a MS |
500 | SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA |
501 | CREATE_STACK_FRAME __LC_SAVE_AREA | |
502 | mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW | |
503 | l %r12,__LC_THREAD_INFO # load pointer to thread_info struct | |
1da177e4 LT |
504 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
505 | bz BASED(pgm_no_vtime2) | |
506 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER | |
507 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
508 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
509 | pgm_no_vtime2: | |
1de3447a | 510 | l %r1,__TI_task(%r12) |
6a2df3a8 MS |
511 | tm SP_PSW+1(%r15),0x01 # kernel per event ? |
512 | bz BASED(kernel_per) | |
5e9a2692 MS |
513 | mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE |
514 | mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS | |
515 | mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID | |
516 | oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP | |
25d83cbf | 517 | l %r3,__LC_PGM_ILC # load program interruption code |
1e54622e MS |
518 | l %r4,__LC_TRANS_EXC_CODE |
519 | REENABLE_IRQS | |
1da177e4 | 520 | la %r8,0x7f |
25d83cbf | 521 | nr %r8,%r3 # clear per-event-bit and ilc |
f5cdac27 | 522 | be BASED(pgm_exit2) # only per or per+check ? |
f5cdac27 | 523 | sll %r8,2 |
1de3447a MS |
524 | l %r1,BASED(.Ljump_table) |
525 | l %r1,0(%r8,%r1) # load address of handler routine | |
f5cdac27 | 526 | la %r2,SP_PTREGS(%r15) # address of register-save area |
1de3447a | 527 | basr %r14,%r1 # branch to interrupt-handler |
f5cdac27 | 528 | pgm_exit2: |
f5cdac27 | 529 | b BASED(sysc_return) |
1da177e4 LT |
530 | |
531 | # | |
532 | # it was a single stepped SVC that is causing all the trouble | |
533 | # | |
534 | pgm_svcper: | |
1de3447a MS |
535 | SAVE_ALL_PGM __LC_SVC_OLD_PSW,__LC_SAVE_AREA |
536 | CREATE_STACK_FRAME __LC_SAVE_AREA | |
537 | mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW | |
538 | mvc SP_ILC(4,%r15),__LC_SVC_ILC | |
539 | l %r12,__LC_THREAD_INFO # load pointer to thread_info struct | |
1da177e4 LT |
540 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
541 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
542 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1de3447a | 543 | l %r8,__TI_task(%r12) |
5e9a2692 MS |
544 | mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE |
545 | mvc __THREAD_per_address(4,%r8),__LC_PER_ADDRESS | |
546 | mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID | |
547 | oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP | |
1da177e4 | 548 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
6a2df3a8 | 549 | lm %r2,%r6,SP_R2(%r15) # load svc arguments |
1da177e4 LT |
550 | b BASED(sysc_do_svc) |
551 | ||
4ba069b8 MG |
552 | # |
553 | # per was called from kernel, must be kprobes | |
554 | # | |
555 | kernel_per: | |
9ec27080 | 556 | REENABLE_IRQS |
1de3447a | 557 | xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) |
4ba069b8 MG |
558 | la %r2,SP_PTREGS(%r15) # address of register-save area |
559 | l %r1,BASED(.Lhandle_per) # load adr. of per handler | |
6a2df3a8 MS |
560 | basr %r14,%r1 # branch to do_single_step |
561 | b BASED(pgm_exit) | |
4ba069b8 | 562 | |
1da177e4 LT |
563 | /* |
564 | * IO interrupt handler routine | |
565 | */ | |
566 | ||
25d83cbf | 567 | .globl io_int_handler |
1da177e4 | 568 | io_int_handler: |
1da177e4 | 569 | stck __LC_INT_CLOCK |
9cfb9b3c | 570 | stpt __LC_ASYNC_ENTER_TIMER |
63b12246 | 571 | SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 |
1de3447a MS |
572 | CREATE_STACK_FRAME __LC_SAVE_AREA+16 |
573 | mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack | |
574 | l %r12,__LC_THREAD_INFO # load pointer to thread_info struct | |
1da177e4 LT |
575 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
576 | bz BASED(io_no_vtime) | |
577 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER | |
578 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
579 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
580 | io_no_vtime: | |
1f194a4c | 581 | TRACE_IRQS_OFF |
25d83cbf HC |
582 | l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ |
583 | la %r2,SP_PTREGS(%r15) # address of register-save area | |
584 | basr %r14,%r1 # branch to standard irq handler | |
1da177e4 | 585 | io_return: |
6a2df3a8 MS |
586 | LOCKDEP_SYS_EXIT |
587 | TRACE_IRQS_ON | |
588 | io_tif: | |
1de3447a | 589 | tm __TI_flags+3(%r12),_TIF_WORK_INT |
25d83cbf | 590 | bnz BASED(io_work) # there is work to do (signals etc.) |
411788ea | 591 | io_restore: |
25d83cbf | 592 | RESTORE_ALL __LC_RETURN_PSW,0 |
ae6aa2ea | 593 | io_done: |
1da177e4 | 594 | |
2688905e | 595 | # |
43d399d2 MS |
596 | # There is work todo, find out in which context we have been interrupted: |
597 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
598 | # 2) if we return to kernel code and preemptive scheduling is enabled check | |
599 | # the preemption counter and if it is zero call preempt_schedule_irq | |
600 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
601 | # |
602 | io_work: | |
603 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
43d399d2 MS |
604 | bo BASED(io_work_user) # yes -> do resched & signal |
605 | #ifdef CONFIG_PREEMPT | |
2688905e | 606 | # check for preemptive scheduling |
1de3447a | 607 | icm %r0,15,__TI_precount(%r12) |
2688905e | 608 | bnz BASED(io_restore) # preemption disabled |
1de3447a | 609 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
6a2df3a8 | 610 | bno BASED(io_restore) |
43d399d2 | 611 | # switch to kernel stack |
1da177e4 LT |
612 | l %r1,SP_R15(%r15) |
613 | s %r1,BASED(.Lc_spsize) | |
614 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 615 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
1da177e4 | 616 | lr %r15,%r1 |
6a2df3a8 MS |
617 | # TRACE_IRQS_ON already done at io_return, call |
618 | # TRACE_IRQS_OFF to keep things symmetrical | |
619 | TRACE_IRQS_OFF | |
b8e7a54c | 620 | l %r1,BASED(.Lpreempt_schedule_irq) |
6a2df3a8 MS |
621 | basr %r14,%r1 # call preempt_schedule_irq |
622 | b BASED(io_return) | |
623 | #else | |
43d399d2 | 624 | b BASED(io_restore) |
6a2df3a8 | 625 | #endif |
1da177e4 | 626 | |
43d399d2 MS |
627 | # |
628 | # Need to do work before returning to userspace, switch to kernel stack | |
629 | # | |
2688905e | 630 | io_work_user: |
1da177e4 LT |
631 | l %r1,__LC_KERNEL_STACK |
632 | s %r1,BASED(.Lc_spsize) | |
633 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 634 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
1da177e4 | 635 | lr %r15,%r1 |
6a2df3a8 | 636 | |
1da177e4 LT |
637 | # |
638 | # One of the work bits is on. Find out which one. | |
43d399d2 | 639 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
25d83cbf | 640 | # and _TIF_MCCK_PENDING |
1da177e4 | 641 | # |
6a2df3a8 | 642 | io_work_tif: |
1de3447a | 643 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
25d83cbf | 644 | bo BASED(io_mcck_pending) |
1de3447a | 645 | tm __TI_flags+3(%r12),_TIF_NEED_RESCHED |
1da177e4 | 646 | bo BASED(io_reschedule) |
1de3447a | 647 | tm __TI_flags+3(%r12),_TIF_SIGPENDING |
43d399d2 | 648 | bo BASED(io_sigpending) |
1de3447a | 649 | tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME |
43d399d2 MS |
650 | bo BASED(io_notify_resume) |
651 | b BASED(io_return) # beware of critical section cleanup | |
1da177e4 | 652 | |
77fa2245 HC |
653 | # |
654 | # _TIF_MCCK_PENDING is set, call handler | |
655 | # | |
656 | io_mcck_pending: | |
6a2df3a8 | 657 | # TRACE_IRQS_ON already done at io_return |
77fa2245 | 658 | l %r1,BASED(.Ls390_handle_mcck) |
b771aeac | 659 | basr %r14,%r1 # TIF bit will be cleared by handler |
6a2df3a8 MS |
660 | TRACE_IRQS_OFF |
661 | b BASED(io_return) | |
77fa2245 | 662 | |
1da177e4 LT |
663 | # |
664 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
665 | # |
666 | io_reschedule: | |
6a2df3a8 | 667 | # TRACE_IRQS_ON already done at io_return |
25d83cbf HC |
668 | l %r1,BASED(.Lschedule) |
669 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts | |
670 | basr %r14,%r1 # call scheduler | |
671 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
411788ea | 672 | TRACE_IRQS_OFF |
6a2df3a8 | 673 | b BASED(io_return) |
1da177e4 LT |
674 | |
675 | # | |
02a029b3 | 676 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 677 | # |
25d83cbf | 678 | io_sigpending: |
6a2df3a8 | 679 | # TRACE_IRQS_ON already done at io_return |
25d83cbf HC |
680 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
681 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
682 | l %r1,BASED(.Ldo_signal) | |
683 | basr %r14,%r1 # call do_signal | |
684 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
411788ea | 685 | TRACE_IRQS_OFF |
6a2df3a8 | 686 | b BASED(io_return) |
1da177e4 | 687 | |
753c4dd6 MS |
688 | # |
689 | # _TIF_SIGPENDING is set, call do_signal | |
690 | # | |
691 | io_notify_resume: | |
6a2df3a8 | 692 | # TRACE_IRQS_ON already done at io_return |
753c4dd6 MS |
693 | stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
694 | la %r2,SP_PTREGS(%r15) # load pt_regs | |
695 | l %r1,BASED(.Ldo_notify_resume) | |
696 | basr %r14,%r1 # call do_signal | |
697 | stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts | |
698 | TRACE_IRQS_OFF | |
6a2df3a8 | 699 | b BASED(io_return) |
753c4dd6 | 700 | |
1da177e4 LT |
701 | /* |
702 | * External interrupt handler routine | |
703 | */ | |
704 | ||
25d83cbf | 705 | .globl ext_int_handler |
1da177e4 | 706 | ext_int_handler: |
1da177e4 | 707 | stck __LC_INT_CLOCK |
9cfb9b3c | 708 | stpt __LC_ASYNC_ENTER_TIMER |
63b12246 | 709 | SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 |
1de3447a MS |
710 | CREATE_STACK_FRAME __LC_SAVE_AREA+16 |
711 | mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack | |
712 | l %r12,__LC_THREAD_INFO # load pointer to thread_info struct | |
1da177e4 LT |
713 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
714 | bz BASED(ext_no_vtime) | |
715 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER | |
716 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
717 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
718 | ext_no_vtime: | |
1f194a4c | 719 | TRACE_IRQS_OFF |
25d83cbf | 720 | la %r2,SP_PTREGS(%r15) # address of register-save area |
f6649a7e MS |
721 | l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code |
722 | l %r4,__LC_EXT_PARAMS # get external parameters | |
1da177e4 LT |
723 | l %r1,BASED(.Ldo_extint) |
724 | basr %r14,%r1 | |
725 | b BASED(io_return) | |
726 | ||
ae6aa2ea MS |
727 | __critical_end: |
728 | ||
1da177e4 LT |
729 | /* |
730 | * Machine check handler routines | |
731 | */ | |
732 | ||
25d83cbf | 733 | .globl mcck_int_handler |
1da177e4 | 734 | mcck_int_handler: |
6377981f | 735 | stck __LC_MCCK_CLOCK |
77fa2245 HC |
736 | spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer |
737 | lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs | |
1da177e4 | 738 | SAVE_ALL_BASE __LC_SAVE_AREA+32 |
77fa2245 | 739 | la %r12,__LC_MCK_OLD_PSW |
25d83cbf | 740 | tm __LC_MCCK_CODE,0x80 # system damage? |
77fa2245 | 741 | bo BASED(mcck_int_main) # yes -> rest of mcck code invalid |
6377981f | 742 | mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA |
63b12246 MS |
743 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
744 | bo BASED(1f) | |
745 | la %r14,__LC_SYNC_ENTER_TIMER | |
746 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
747 | bl BASED(0f) | |
748 | la %r14,__LC_ASYNC_ENTER_TIMER | |
749 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
750 | bl BASED(0f) | |
751 | la %r14,__LC_EXIT_TIMER | |
752 | 0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER | |
753 | bl BASED(0f) | |
754 | la %r14,__LC_LAST_UPDATE_TIMER | |
755 | 0: spt 0(%r14) | |
6377981f | 756 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c185b783 | 757 | 1: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
77fa2245 HC |
758 | bno BASED(mcck_int_main) # no -> skip cleanup critical |
759 | tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit | |
760 | bnz BASED(mcck_int_main) # from user -> load async stack | |
761 | clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) | |
762 | bhe BASED(mcck_int_main) | |
763 | clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) | |
764 | bl BASED(mcck_int_main) | |
765 | l %r14,BASED(.Lcleanup_critical) | |
766 | basr %r14,%r14 | |
767 | mcck_int_main: | |
768 | l %r14,__LC_PANIC_STACK # are we already on the panic stack? | |
769 | slr %r14,%r15 | |
770 | sra %r14,PAGE_SHIFT | |
771 | be BASED(0f) | |
772 | l %r15,__LC_PANIC_STACK # load panic stack | |
1de3447a MS |
773 | 0: s %r15,BASED(.Lc_spsize) # make room for registers & psw |
774 | CREATE_STACK_FRAME __LC_SAVE_AREA+32 | |
775 | mvc SP_PSW(8,%r15),0(%r12) | |
776 | l %r12,__LC_THREAD_INFO # load pointer to thread_info struct | |
25d83cbf | 777 | tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? |
ae6aa2ea | 778 | bno BASED(mcck_no_vtime) # no -> skip cleanup critical |
63b12246 | 779 | tm SP_PSW+1(%r15),0x01 # interrupting from user ? |
ae6aa2ea | 780 | bz BASED(mcck_no_vtime) |
6377981f | 781 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER |
ae6aa2ea | 782 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER |
6377981f | 783 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER |
ae6aa2ea | 784 | mcck_no_vtime: |
77fa2245 | 785 | la %r2,SP_PTREGS(%r15) # load pt_regs |
25d83cbf HC |
786 | l %r1,BASED(.Ls390_mcck) |
787 | basr %r14,%r1 # call machine check handler | |
788 | tm SP_PSW+1(%r15),0x01 # returning to user ? | |
77fa2245 | 789 | bno BASED(mcck_return) |
25d83cbf | 790 | l %r1,__LC_KERNEL_STACK # switch to kernel stack |
77fa2245 HC |
791 | s %r1,BASED(.Lc_spsize) |
792 | mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) | |
25d83cbf | 793 | xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain |
77fa2245 HC |
794 | lr %r15,%r1 |
795 | stosm __SF_EMPTY(%r15),0x04 # turn dat on | |
1de3447a | 796 | tm __TI_flags+3(%r12),_TIF_MCCK_PENDING |
77fa2245 | 797 | bno BASED(mcck_return) |
1f194a4c | 798 | TRACE_IRQS_OFF |
77fa2245 HC |
799 | l %r1,BASED(.Ls390_handle_mcck) |
800 | basr %r14,%r1 # call machine check handler | |
1f194a4c | 801 | TRACE_IRQS_ON |
1da177e4 | 802 | mcck_return: |
63b12246 MS |
803 | mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW |
804 | ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit | |
63b12246 MS |
805 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
806 | bno BASED(0f) | |
807 | lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 | |
808 | stpt __LC_EXIT_TIMER | |
809 | lpsw __LC_RETURN_MCCK_PSW # back to caller | |
c185b783 | 810 | 0: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 |
63b12246 MS |
811 | lpsw __LC_RETURN_MCCK_PSW # back to caller |
812 | ||
25d83cbf | 813 | RESTORE_ALL __LC_RETURN_MCCK_PSW,0 |
1da177e4 | 814 | |
1da177e4 LT |
815 | /* |
816 | * Restart interruption handler, kick starter for additional CPUs | |
817 | */ | |
84b36a8e | 818 | #ifdef CONFIG_SMP |
2bc89b5e | 819 | __CPUINIT |
25d83cbf | 820 | .globl restart_int_handler |
1da177e4 | 821 | restart_int_handler: |
5b409ed1 MS |
822 | basr %r1,0 |
823 | restart_base: | |
824 | spt restart_vtime-restart_base(%r1) | |
825 | stck __LC_LAST_UPDATE_CLOCK | |
826 | mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) | |
827 | mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) | |
25d83cbf HC |
828 | l %r15,__LC_SAVE_AREA+60 # load ksp |
829 | lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs | |
830 | lam %a0,%a15,__LC_AREGS_SAVE_AREA | |
831 | lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone | |
5b409ed1 MS |
832 | l %r1,__LC_THREAD_INFO |
833 | mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) | |
834 | mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) | |
835 | xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER | |
25d83cbf HC |
836 | stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on |
837 | basr %r14,0 | |
838 | l %r14,restart_addr-.(%r14) | |
839 | br %r14 # branch to start_secondary | |
1da177e4 | 840 | restart_addr: |
25d83cbf | 841 | .long start_secondary |
5b409ed1 MS |
842 | .align 8 |
843 | restart_vtime: | |
844 | .long 0x7fffffff,0xffffffff | |
84b36a8e | 845 | .previous |
1da177e4 LT |
846 | #else |
847 | /* | |
848 | * If we do not run with SMP enabled, let the new CPU crash ... | |
849 | */ | |
25d83cbf | 850 | .globl restart_int_handler |
1da177e4 | 851 | restart_int_handler: |
25d83cbf | 852 | basr %r1,0 |
1da177e4 | 853 | restart_base: |
25d83cbf HC |
854 | lpsw restart_crash-restart_base(%r1) |
855 | .align 8 | |
1da177e4 | 856 | restart_crash: |
25d83cbf | 857 | .long 0x000a0000,0x00000000 |
1da177e4 LT |
858 | restart_go: |
859 | #endif | |
860 | ||
860dba45 MS |
861 | .section .kprobes.text, "ax" |
862 | ||
1da177e4 LT |
863 | #ifdef CONFIG_CHECK_STACK |
864 | /* | |
865 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
866 | * No need to properly save the registers, we are going to panic anyway. | |
867 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
868 | */ | |
869 | stack_overflow: | |
870 | l %r15,__LC_PANIC_STACK # change to panic stack | |
871 | sl %r15,BASED(.Lc_spsize) | |
872 | mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack | |
873 | stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack | |
874 | la %r1,__LC_SAVE_AREA | |
875 | ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? | |
876 | be BASED(0f) | |
877 | ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? | |
878 | be BASED(0f) | |
879 | la %r1,__LC_SAVE_AREA+16 | |
880 | 0: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack | |
25d83cbf | 881 | xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain |
1da177e4 | 882 | l %r1,BASED(1f) # branch to kernel_stack_overflow |
25d83cbf | 883 | la %r2,SP_PTREGS(%r15) # load pt_regs |
1da177e4 | 884 | br %r1 |
25d83cbf | 885 | 1: .long kernel_stack_overflow |
1da177e4 LT |
886 | #endif |
887 | ||
888 | cleanup_table_system_call: | |
889 | .long system_call + 0x80000000, sysc_do_svc + 0x80000000 | |
6a2df3a8 MS |
890 | cleanup_table_sysc_tif: |
891 | .long sysc_tif + 0x80000000, sysc_restore + 0x80000000 | |
892 | cleanup_table_sysc_restore: | |
893 | .long sysc_restore + 0x80000000, sysc_done + 0x80000000 | |
894 | cleanup_table_io_tif: | |
895 | .long io_tif + 0x80000000, io_restore + 0x80000000 | |
896 | cleanup_table_io_restore: | |
897 | .long io_restore + 0x80000000, io_done + 0x80000000 | |
1da177e4 LT |
898 | |
899 | cleanup_critical: | |
900 | clc 4(4,%r12),BASED(cleanup_table_system_call) | |
901 | bl BASED(0f) | |
902 | clc 4(4,%r12),BASED(cleanup_table_system_call+4) | |
903 | bl BASED(cleanup_system_call) | |
904 | 0: | |
6a2df3a8 | 905 | clc 4(4,%r12),BASED(cleanup_table_sysc_tif) |
1da177e4 | 906 | bl BASED(0f) |
6a2df3a8 MS |
907 | clc 4(4,%r12),BASED(cleanup_table_sysc_tif+4) |
908 | bl BASED(cleanup_sysc_tif) | |
1da177e4 | 909 | 0: |
6a2df3a8 | 910 | clc 4(4,%r12),BASED(cleanup_table_sysc_restore) |
1da177e4 | 911 | bl BASED(0f) |
6a2df3a8 MS |
912 | clc 4(4,%r12),BASED(cleanup_table_sysc_restore+4) |
913 | bl BASED(cleanup_sysc_restore) | |
63b12246 | 914 | 0: |
6a2df3a8 | 915 | clc 4(4,%r12),BASED(cleanup_table_io_tif) |
63b12246 | 916 | bl BASED(0f) |
6a2df3a8 MS |
917 | clc 4(4,%r12),BASED(cleanup_table_io_tif+4) |
918 | bl BASED(cleanup_io_tif) | |
ae6aa2ea | 919 | 0: |
6a2df3a8 | 920 | clc 4(4,%r12),BASED(cleanup_table_io_restore) |
ae6aa2ea | 921 | bl BASED(0f) |
6a2df3a8 MS |
922 | clc 4(4,%r12),BASED(cleanup_table_io_restore+4) |
923 | bl BASED(cleanup_io_restore) | |
1da177e4 LT |
924 | 0: |
925 | br %r14 | |
926 | ||
927 | cleanup_system_call: | |
928 | mvc __LC_RETURN_PSW(8),0(%r12) | |
1da177e4 LT |
929 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) |
930 | bh BASED(0f) | |
6377981f MS |
931 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
932 | c %r12,BASED(.Lmck_old_psw) | |
933 | be BASED(0f) | |
1da177e4 | 934 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER |
6377981f MS |
935 | 0: c %r12,BASED(.Lmck_old_psw) |
936 | la %r12,__LC_SAVE_AREA+32 | |
937 | be BASED(0f) | |
938 | la %r12,__LC_SAVE_AREA+16 | |
1da177e4 LT |
939 | 0: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) |
940 | bhe BASED(cleanup_vtime) | |
1da177e4 LT |
941 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) |
942 | bh BASED(0f) | |
ae6aa2ea MS |
943 | mvc __LC_SAVE_AREA(16),0(%r12) |
944 | 0: st %r13,4(%r12) | |
1de3447a MS |
945 | l %r15,__LC_KERNEL_STACK # problem state -> load ksp |
946 | s %r15,BASED(.Lc_spsize) # make room for registers & psw | |
ae6aa2ea | 947 | st %r15,12(%r12) |
1de3447a MS |
948 | CREATE_STACK_FRAME __LC_SAVE_AREA |
949 | mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW | |
950 | mvc SP_ILC(4,%r15),__LC_SVC_ILC | |
951 | mvc 0(4,%r12),__LC_THREAD_INFO | |
1da177e4 LT |
952 | cleanup_vtime: |
953 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) | |
954 | bhe BASED(cleanup_stime) | |
1da177e4 LT |
955 | UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER |
956 | cleanup_stime: | |
957 | clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) | |
958 | bh BASED(cleanup_update) | |
959 | UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER | |
960 | cleanup_update: | |
961 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER | |
1da177e4 LT |
962 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) |
963 | la %r12,__LC_RETURN_PSW | |
964 | br %r14 | |
965 | cleanup_system_call_insn: | |
966 | .long sysc_saveall + 0x80000000 | |
25d83cbf HC |
967 | .long system_call + 0x80000000 |
968 | .long sysc_vtime + 0x80000000 | |
969 | .long sysc_stime + 0x80000000 | |
970 | .long sysc_update + 0x80000000 | |
1da177e4 | 971 | |
6a2df3a8 | 972 | cleanup_sysc_tif: |
1da177e4 | 973 | mvc __LC_RETURN_PSW(4),0(%r12) |
6a2df3a8 | 974 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif) |
1da177e4 LT |
975 | la %r12,__LC_RETURN_PSW |
976 | br %r14 | |
977 | ||
6a2df3a8 MS |
978 | cleanup_sysc_restore: |
979 | clc 4(4,%r12),BASED(cleanup_sysc_restore_insn) | |
ae6aa2ea | 980 | be BASED(2f) |
6377981f MS |
981 | mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER |
982 | c %r12,BASED(.Lmck_old_psw) | |
983 | be BASED(0f) | |
1da177e4 | 984 | mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER |
6377981f | 985 | 0: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4) |
ae6aa2ea | 986 | be BASED(2f) |
1da177e4 | 987 | mvc __LC_RETURN_PSW(8),SP_PSW(%r15) |
ae6aa2ea | 988 | c %r12,BASED(.Lmck_old_psw) |
6377981f MS |
989 | la %r12,__LC_SAVE_AREA+32 |
990 | be BASED(1f) | |
991 | la %r12,__LC_SAVE_AREA+16 | |
992 | 1: mvc 0(16,%r12),SP_R12(%r15) | |
993 | lm %r0,%r11,SP_R0(%r15) | |
1da177e4 | 994 | l %r15,SP_R15(%r15) |
ae6aa2ea | 995 | 2: la %r12,__LC_RETURN_PSW |
1da177e4 | 996 | br %r14 |
6a2df3a8 | 997 | cleanup_sysc_restore_insn: |
411788ea | 998 | .long sysc_done - 4 + 0x80000000 |
411788ea | 999 | .long sysc_done - 8 + 0x80000000 |
1da177e4 | 1000 | |
6a2df3a8 | 1001 | cleanup_io_tif: |
176b1803 | 1002 | mvc __LC_RETURN_PSW(4),0(%r12) |
6a2df3a8 | 1003 | mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif) |
176b1803 MS |
1004 | la %r12,__LC_RETURN_PSW |
1005 | br %r14 | |
1006 | ||
6a2df3a8 MS |
1007 | cleanup_io_restore: |
1008 | clc 4(4,%r12),BASED(cleanup_io_restore_insn) | |
6377981f MS |
1009 | be BASED(1f) |
1010 | mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER | |
6a2df3a8 | 1011 | clc 4(4,%r12),BASED(cleanup_io_restore_insn+4) |
6377981f | 1012 | be BASED(1f) |
ae6aa2ea | 1013 | mvc __LC_RETURN_PSW(8),SP_PSW(%r15) |
ae6aa2ea | 1014 | mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) |
6377981f | 1015 | lm %r0,%r11,SP_R0(%r15) |
ae6aa2ea | 1016 | l %r15,SP_R15(%r15) |
6377981f | 1017 | 1: la %r12,__LC_RETURN_PSW |
ae6aa2ea | 1018 | br %r14 |
6a2df3a8 | 1019 | cleanup_io_restore_insn: |
411788ea | 1020 | .long io_done - 4 + 0x80000000 |
411788ea | 1021 | .long io_done - 8 + 0x80000000 |
ae6aa2ea | 1022 | |
1da177e4 LT |
1023 | /* |
1024 | * Integer constants | |
1025 | */ | |
25d83cbf HC |
1026 | .align 4 |
1027 | .Lc_spsize: .long SP_SIZE | |
1028 | .Lc_overhead: .long STACK_FRAME_OVERHEAD | |
25d83cbf HC |
1029 | .Lnr_syscalls: .long NR_syscalls |
1030 | .L0x018: .short 0x018 | |
1031 | .L0x020: .short 0x020 | |
1032 | .L0x028: .short 0x028 | |
1033 | .L0x030: .short 0x030 | |
1034 | .L0x038: .short 0x038 | |
1035 | .Lc_1: .long 1 | |
1da177e4 LT |
1036 | |
1037 | /* | |
1038 | * Symbol constants | |
1039 | */ | |
25d83cbf | 1040 | .Ls390_mcck: .long s390_do_machine_check |
77fa2245 | 1041 | .Ls390_handle_mcck: |
25d83cbf HC |
1042 | .long s390_handle_mcck |
1043 | .Lmck_old_psw: .long __LC_MCK_OLD_PSW | |
1044 | .Ldo_IRQ: .long do_IRQ | |
1045 | .Ldo_extint: .long do_extint | |
1046 | .Ldo_signal: .long do_signal | |
753c4dd6 MS |
1047 | .Ldo_notify_resume: |
1048 | .long do_notify_resume | |
5e9a2692 | 1049 | .Lhandle_per: .long do_per_trap |
03ff9a23 MS |
1050 | .Ldo_execve: .long do_execve |
1051 | .Lexecve_tail: .long execve_tail | |
25d83cbf HC |
1052 | .Ljump_table: .long pgm_check_table |
1053 | .Lschedule: .long schedule | |
ab1809b4 | 1054 | #ifdef CONFIG_PREEMPT |
b8e7a54c HC |
1055 | .Lpreempt_schedule_irq: |
1056 | .long preempt_schedule_irq | |
ab1809b4 | 1057 | #endif |
753c4dd6 MS |
1058 | .Ltrace_entry: .long do_syscall_trace_enter |
1059 | .Ltrace_exit: .long do_syscall_trace_exit | |
25d83cbf HC |
1060 | .Lschedtail: .long schedule_tail |
1061 | .Lsysc_table: .long sys_call_table | |
1f194a4c | 1062 | #ifdef CONFIG_TRACE_IRQFLAGS |
50bec4ce HC |
1063 | .Ltrace_irq_on_caller: |
1064 | .long trace_hardirqs_on_caller | |
1065 | .Ltrace_irq_off_caller: | |
1066 | .long trace_hardirqs_off_caller | |
af4c6874 HC |
1067 | #endif |
1068 | #ifdef CONFIG_LOCKDEP | |
523b44cf HC |
1069 | .Llockdep_sys_exit: |
1070 | .long lockdep_sys_exit | |
1f194a4c | 1071 | #endif |
1da177e4 | 1072 | .Lcritical_start: |
25d83cbf | 1073 | .long __critical_start + 0x80000000 |
1da177e4 | 1074 | .Lcritical_end: |
25d83cbf | 1075 | .long __critical_end + 0x80000000 |
1da177e4 | 1076 | .Lcleanup_critical: |
25d83cbf | 1077 | .long cleanup_critical |
1da177e4 | 1078 | |
25d83cbf | 1079 | .section .rodata, "a" |
1da177e4 | 1080 | #define SYSCALL(esa,esame,emu) .long esa |
9bf1226b | 1081 | .globl sys_call_table |
1da177e4 LT |
1082 | sys_call_table: |
1083 | #include "syscalls.S" | |
1084 | #undef SYSCALL |