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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * S390 low-level entry points. |
3 | * | |
a53c8fab | 4 | * Copyright IBM Corp. 1999, 2012 |
1da177e4 | 5 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
25d83cbf HC |
6 | * Hartmut Penner (hp@de.ibm.com), |
7 | * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), | |
77fa2245 | 8 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
1da177e4 LT |
9 | */ |
10 | ||
2bc89b5e | 11 | #include <linux/init.h> |
144d634a | 12 | #include <linux/linkage.h> |
eb608fb3 | 13 | #include <asm/processor.h> |
1da177e4 | 14 | #include <asm/cache.h> |
1da177e4 LT |
15 | #include <asm/errno.h> |
16 | #include <asm/ptrace.h> | |
17 | #include <asm/thread_info.h> | |
0013a854 | 18 | #include <asm/asm-offsets.h> |
1da177e4 LT |
19 | #include <asm/unistd.h> |
20 | #include <asm/page.h> | |
eb546195 | 21 | #include <asm/sigp.h> |
1da177e4 | 22 | |
c5328901 MS |
23 | __PT_R0 = __PT_GPRS |
24 | __PT_R1 = __PT_GPRS + 8 | |
25 | __PT_R2 = __PT_GPRS + 16 | |
26 | __PT_R3 = __PT_GPRS + 24 | |
27 | __PT_R4 = __PT_GPRS + 32 | |
28 | __PT_R5 = __PT_GPRS + 40 | |
29 | __PT_R6 = __PT_GPRS + 48 | |
30 | __PT_R7 = __PT_GPRS + 56 | |
31 | __PT_R8 = __PT_GPRS + 64 | |
32 | __PT_R9 = __PT_GPRS + 72 | |
33 | __PT_R10 = __PT_GPRS + 80 | |
34 | __PT_R11 = __PT_GPRS + 88 | |
35 | __PT_R12 = __PT_GPRS + 96 | |
36 | __PT_R13 = __PT_GPRS + 104 | |
37 | __PT_R14 = __PT_GPRS + 112 | |
38 | __PT_R15 = __PT_GPRS + 120 | |
1da177e4 LT |
39 | |
40 | STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER | |
41 | STACK_SIZE = 1 << STACK_SHIFT | |
42 | ||
753c4dd6 | 43 | _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
b6ef5bb3 | 44 | _TIF_MCCK_PENDING | _TIF_PER_TRAP ) |
753c4dd6 | 45 | _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
54dfe5dd | 46 | _TIF_MCCK_PENDING) |
b6ef5bb3 MS |
47 | _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
48 | _TIF_SYSCALL_TRACEPOINT) | |
603d1a50 | 49 | _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) |
1da177e4 LT |
50 | |
51 | #define BASED(name) name-system_call(%r13) | |
52 | ||
1f194a4c | 53 | .macro TRACE_IRQS_ON |
c5328901 | 54 | #ifdef CONFIG_TRACE_IRQFLAGS |
6a2df3a8 MS |
55 | basr %r2,%r0 |
56 | brasl %r14,trace_hardirqs_on_caller | |
c5328901 | 57 | #endif |
1f194a4c HC |
58 | .endm |
59 | ||
60 | .macro TRACE_IRQS_OFF | |
c5328901 | 61 | #ifdef CONFIG_TRACE_IRQFLAGS |
6a2df3a8 MS |
62 | basr %r2,%r0 |
63 | brasl %r14,trace_hardirqs_off_caller | |
411788ea | 64 | #endif |
c5328901 | 65 | .endm |
411788ea | 66 | |
411788ea | 67 | .macro LOCKDEP_SYS_EXIT |
c5328901 MS |
68 | #ifdef CONFIG_LOCKDEP |
69 | tm __PT_PSW+1(%r11),0x01 # returning to user ? | |
70 | jz .+10 | |
411788ea | 71 | brasl %r14,lockdep_sys_exit |
1f194a4c | 72 | #endif |
1da177e4 | 73 | .endm |
1da177e4 | 74 | |
c5328901 MS |
75 | .macro SPP newpp |
76 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) | |
77 | tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP | |
78 | jz .+8 | |
79 | .insn s,0xb2800000,\newpp | |
80 | #endif | |
81 | .endm | |
1da177e4 | 82 | |
c5328901 MS |
83 | .macro HANDLE_SIE_INTERCEPT scratch |
84 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) | |
6022afc0 MS |
85 | tmhh %r8,0x0001 # interrupting from user ? |
86 | jnz .+42 | |
c5328901 MS |
87 | lgr \scratch,%r9 |
88 | slg \scratch,BASED(.Lsie_loop) | |
89 | clg \scratch,BASED(.Lsie_length) | |
6022afc0 | 90 | jhe .+22 |
c5328901 | 91 | lg %r9,BASED(.Lsie_loop) |
9ee39e4b | 92 | SPP BASED(.Lhost_id) # set host id |
c5328901 | 93 | #endif |
987ad70a MS |
94 | .endm |
95 | ||
c5328901 | 96 | .macro CHECK_STACK stacksize,savearea |
63b12246 | 97 | #ifdef CONFIG_CHECK_STACK |
c5328901 MS |
98 | tml %r15,\stacksize - CONFIG_STACK_GUARD |
99 | lghi %r14,\savearea | |
100 | jz stack_overflow | |
63b12246 | 101 | #endif |
63b12246 MS |
102 | .endm |
103 | ||
c5328901 MS |
104 | .macro SWITCH_ASYNC savearea,stack,shift |
105 | tmhh %r8,0x0001 # interrupting from user ? | |
106 | jnz 1f | |
107 | lgr %r14,%r9 | |
108 | slg %r14,BASED(.Lcritical_start) | |
109 | clg %r14,BASED(.Lcritical_length) | |
1da177e4 | 110 | jhe 0f |
c5328901 | 111 | lghi %r11,\savearea # inside critical section, do cleanup |
1da177e4 | 112 | brasl %r14,cleanup_critical |
c5328901 | 113 | tmhh %r8,0x0001 # retest problem state after cleanup |
1da177e4 | 114 | jnz 1f |
c5328901 | 115 | 0: lg %r14,\stack # are we already on the target stack? |
1da177e4 | 116 | slgr %r14,%r15 |
c5328901 | 117 | srag %r14,%r14,\shift |
86f2552b | 118 | jnz 1f |
c5328901 MS |
119 | CHECK_STACK 1<<\shift,\savearea |
120 | j 2f | |
121 | 1: lg %r15,\stack # load target stack | |
122 | 2: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
123 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
25d83cbf | 124 | .endm |
1da177e4 | 125 | |
c5328901 MS |
126 | .macro UPDATE_VTIME scratch,enter_timer |
127 | lg \scratch,__LC_EXIT_TIMER | |
128 | slg \scratch,\enter_timer | |
129 | alg \scratch,__LC_USER_TIMER | |
130 | stg \scratch,__LC_USER_TIMER | |
131 | lg \scratch,__LC_LAST_UPDATE_TIMER | |
132 | slg \scratch,__LC_EXIT_TIMER | |
133 | alg \scratch,__LC_SYSTEM_TIMER | |
134 | stg \scratch,__LC_SYSTEM_TIMER | |
135 | mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer | |
1da177e4 LT |
136 | .endm |
137 | ||
c5328901 MS |
138 | .macro LAST_BREAK scratch |
139 | srag \scratch,%r10,23 | |
140 | jz .+10 | |
141 | stg %r10,__TI_last_break(%r12) | |
86f2552b MS |
142 | .endm |
143 | ||
1e54622e | 144 | .macro REENABLE_IRQS |
c5328901 MS |
145 | stg %r8,__LC_RETURN_PSW |
146 | ni __LC_RETURN_PSW,0xbf | |
147 | ssm __LC_RETURN_PSW | |
1e54622e MS |
148 | .endm |
149 | ||
473e66ba | 150 | .macro STCK savearea |
d652d596 | 151 | #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES |
473e66ba HC |
152 | .insn s,0xb27c0000,\savearea # store clock fast |
153 | #else | |
154 | .insn s,0xb2050000,\savearea # store clock | |
155 | #endif | |
156 | .endm | |
157 | ||
860dba45 MS |
158 | .section .kprobes.text, "ax" |
159 | ||
1da177e4 LT |
160 | /* |
161 | * Scheduler resume function, called by switch_to | |
162 | * gpr2 = (task_struct *) prev | |
163 | * gpr3 = (task_struct *) next | |
164 | * Returns: | |
165 | * gpr2 = prev | |
166 | */ | |
144d634a | 167 | ENTRY(__switch_to) |
eda0c6d6 MS |
168 | stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
169 | stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev | |
5e9a2692 MS |
170 | lg %r4,__THREAD_info(%r2) # get thread_info of prev |
171 | lg %r5,__THREAD_info(%r3) # get thread_info of next | |
eda0c6d6 MS |
172 | lgr %r15,%r5 |
173 | aghi %r15,STACK_SIZE # end of kernel stack of next | |
174 | stg %r3,__LC_CURRENT # store task struct of next | |
175 | stg %r5,__LC_THREAD_INFO # store thread info of next | |
176 | stg %r15,__LC_KERNEL_STACK # store end of kernel stack | |
177 | lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 | |
178 | mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next | |
179 | lg %r15,__THREAD_ksp(%r3) # load kernel stack of next | |
77fa2245 | 180 | tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending? |
5e9a2692 MS |
181 | jz 0f |
182 | ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev | |
183 | oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next | |
eda0c6d6 | 184 | 0: lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
1da177e4 LT |
185 | br %r14 |
186 | ||
187 | __critical_start: | |
188 | /* | |
189 | * SVC interrupt handler routine. System calls are synchronous events and | |
190 | * are executed with interrupts enabled. | |
191 | */ | |
192 | ||
144d634a | 193 | ENTRY(system_call) |
c185b783 | 194 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
195 | sysc_stmg: |
196 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC | |
197 | lg %r10,__LC_LAST_BREAK | |
198 | lg %r12,__LC_THREAD_INFO | |
199 | larl %r13,system_call | |
200 | sysc_per: | |
201 | lg %r15,__LC_KERNEL_STACK | |
202 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
203 | la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs | |
1da177e4 | 204 | sysc_vtime: |
c5328901 MS |
205 | UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER |
206 | LAST_BREAK %r13 | |
207 | stmg %r0,%r7,__PT_R0(%r11) | |
208 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
209 | mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW | |
aa33c8cb | 210 | mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
1da177e4 | 211 | sysc_do_svc: |
c5328901 | 212 | oi __TI_flags+7(%r12),_TIF_SYSCALL |
aa33c8cb | 213 | llgh %r8,__PT_INT_CODE+2(%r11) |
c5328901 | 214 | slag %r8,%r8,2 # shift and test for svc 0 |
1da177e4 LT |
215 | jnz sysc_nr_ok |
216 | # svc 0: system call number in %r1 | |
c5328901 | 217 | llgfr %r1,%r1 # clear high word in r1 |
86f2552b | 218 | cghi %r1,NR_syscalls |
1da177e4 | 219 | jnl sysc_nr_ok |
aa33c8cb | 220 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 | 221 | slag %r8,%r1,2 |
1da177e4 | 222 | sysc_nr_ok: |
c5328901 | 223 | larl %r10,sys_call_table # 64 bit system call table |
347a8dc3 | 224 | #ifdef CONFIG_COMPAT |
c5328901 | 225 | tm __TI_flags+5(%r12),(_TIF_31BIT>>16) |
c563077e | 226 | jno sysc_noemu |
c5328901 | 227 | larl %r10,sys_call_table_emu # 31 bit system call table |
1da177e4 LT |
228 | sysc_noemu: |
229 | #endif | |
c5328901 MS |
230 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
231 | stg %r2,__PT_ORIG_GPR2(%r11) | |
232 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
233 | lgf %r9,0(%r8,%r10) # get system call add. | |
b6ef5bb3 | 234 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 235 | jnz sysc_tracesys |
c5328901 MS |
236 | basr %r14,%r9 # call sys_xxxx |
237 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 LT |
238 | |
239 | sysc_return: | |
6a2df3a8 MS |
240 | LOCKDEP_SYS_EXIT |
241 | sysc_tif: | |
c5328901 | 242 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
b6ef5bb3 | 243 | jno sysc_restore |
86f2552b | 244 | tm __TI_flags+7(%r12),_TIF_WORK_SVC |
c5328901 | 245 | jnz sysc_work # check for work |
b6ef5bb3 | 246 | ni __TI_flags+7(%r12),255-_TIF_SYSCALL |
411788ea | 247 | sysc_restore: |
c5328901 MS |
248 | lg %r14,__LC_VDSO_PER_CPU |
249 | lmg %r0,%r10,__PT_R0(%r11) | |
250 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
251 | stpt __LC_EXIT_TIMER | |
252 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
253 | lmg %r11,%r15,__PT_R11(%r11) | |
254 | lpswe __LC_RETURN_PSW | |
411788ea HC |
255 | sysc_done: |
256 | ||
43d399d2 MS |
257 | # |
258 | # One of the work bits is on. Find out which one. | |
259 | # | |
b6ef5bb3 | 260 | sysc_work: |
86f2552b | 261 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 262 | jo sysc_mcck_pending |
86f2552b | 263 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 264 | jo sysc_reschedule |
86f2552b | 265 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 266 | jo sysc_sigpending |
86f2552b | 267 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 | 268 | jo sysc_notify_resume |
5e9a2692 | 269 | tm __TI_flags+7(%r12),_TIF_PER_TRAP |
1da177e4 | 270 | jo sysc_singlestep |
43d399d2 | 271 | j sysc_return # beware of critical section cleanup |
1da177e4 LT |
272 | |
273 | # | |
274 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
275 | # |
276 | sysc_reschedule: | |
6a2df3a8 | 277 | larl %r14,sysc_return |
c5328901 | 278 | jg schedule |
1da177e4 | 279 | |
77fa2245 HC |
280 | # |
281 | # _TIF_MCCK_PENDING is set, call handler | |
282 | # | |
283 | sysc_mcck_pending: | |
6a2df3a8 | 284 | larl %r14,sysc_return |
25d83cbf | 285 | jg s390_handle_mcck # TIF bit will be cleared by handler |
77fa2245 | 286 | |
1da177e4 | 287 | # |
02a029b3 | 288 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 289 | # |
25d83cbf | 290 | sysc_sigpending: |
5e9a2692 | 291 | ni __TI_flags+7(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP |
c5328901 MS |
292 | lgr %r2,%r11 # pass pointer to pt_regs |
293 | brasl %r14,do_signal | |
b6ef5bb3 MS |
294 | tm __TI_flags+7(%r12),_TIF_SYSCALL |
295 | jno sysc_return | |
c5328901 MS |
296 | lmg %r2,%r7,__PT_R2(%r11) # load svc arguments |
297 | lghi %r8,0 # svc 0 returns -ENOSYS | |
450e47da | 298 | llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number |
b6ef5bb3 MS |
299 | cghi %r1,NR_syscalls |
300 | jnl sysc_nr_ok # invalid svc number -> do svc 0 | |
c5328901 | 301 | slag %r8,%r1,2 |
b6ef5bb3 | 302 | j sysc_nr_ok # restart svc |
1da177e4 | 303 | |
753c4dd6 MS |
304 | # |
305 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
306 | # | |
307 | sysc_notify_resume: | |
c5328901 | 308 | lgr %r2,%r11 # pass pointer to pt_regs |
6a2df3a8 | 309 | larl %r14,sysc_return |
c5328901 | 310 | jg do_notify_resume |
753c4dd6 | 311 | |
1da177e4 | 312 | # |
5e9a2692 | 313 | # _TIF_PER_TRAP is set, call do_per_trap |
1da177e4 LT |
314 | # |
315 | sysc_singlestep: | |
b6ef5bb3 | 316 | ni __TI_flags+7(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP) |
c5328901 MS |
317 | lgr %r2,%r11 # pass pointer to pt_regs |
318 | larl %r14,sysc_return | |
5e9a2692 | 319 | jg do_per_trap |
1da177e4 | 320 | |
1da177e4 | 321 | # |
753c4dd6 MS |
322 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
323 | # and after the system call | |
1da177e4 LT |
324 | # |
325 | sysc_tracesys: | |
c5328901 | 326 | lgr %r2,%r11 # pass pointer to pt_regs |
1da177e4 | 327 | la %r3,0 |
aa33c8cb | 328 | llgh %r0,__PT_INT_CODE+2(%r11) |
c5328901 | 329 | stg %r0,__PT_R2(%r11) |
753c4dd6 | 330 | brasl %r14,do_syscall_trace_enter |
1da177e4 | 331 | lghi %r0,NR_syscalls |
753c4dd6 | 332 | clgr %r0,%r2 |
1da177e4 | 333 | jnh sysc_tracenogo |
c5328901 MS |
334 | sllg %r8,%r2,2 |
335 | lgf %r9,0(%r8,%r10) | |
1da177e4 | 336 | sysc_tracego: |
c5328901 MS |
337 | lmg %r3,%r7,__PT_R3(%r11) |
338 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
339 | lg %r2,__PT_ORIG_GPR2(%r11) | |
340 | basr %r14,%r9 # call sys_xxx | |
341 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 | 342 | sysc_tracenogo: |
b6ef5bb3 | 343 | tm __TI_flags+6(%r12),_TIF_TRACE >> 8 |
25d83cbf | 344 | jz sysc_return |
c5328901 MS |
345 | lgr %r2,%r11 # pass pointer to pt_regs |
346 | larl %r14,sysc_return | |
753c4dd6 | 347 | jg do_syscall_trace_exit |
1da177e4 LT |
348 | |
349 | # | |
350 | # a new process exits the kernel with ret_from_fork | |
351 | # | |
144d634a | 352 | ENTRY(ret_from_fork) |
c5328901 MS |
353 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
354 | lg %r12,__LC_THREAD_INFO | |
355 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? | |
37fe5d41 AV |
356 | je 1f |
357 | brasl %r14,schedule_tail | |
1f194a4c | 358 | TRACE_IRQS_ON |
c5328901 | 359 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
8f2961c3 | 360 | j sysc_tracenogo |
37fe5d41 AV |
361 | 1: # it's a kernel thread |
362 | stg %r15,__PT_R15(%r11) # store stack pointer for new kthread | |
363 | brasl %r14,schedule_tail | |
364 | TRACE_IRQS_ON | |
365 | ssm __LC_SVC_NEW_PSW # reenable interrupts | |
366 | lmg %r9,%r11,__PT_R9(%r11) # load gprs | |
367 | ENTRY(kernel_thread_starter) | |
368 | la %r2,0(%r10) | |
369 | basr %r14,%r9 | |
370 | la %r2,0 | |
371 | br %r11 # do_exit | |
1da177e4 | 372 | |
f322220d AV |
373 | ENTRY(ret_from_kernel_execve) |
374 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
375 | lgr %r15,%r2 | |
376 | lgr %r11,%r2 | |
377 | aghi %r15,-STACK_FRAME_OVERHEAD | |
03ff9a23 | 378 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f322220d | 379 | lg %r12,__LC_THREAD_INFO |
c5328901 | 380 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
03ff9a23 | 381 | j sysc_return |
1da177e4 LT |
382 | |
383 | /* | |
384 | * Program check handler routine | |
385 | */ | |
386 | ||
144d634a | 387 | ENTRY(pgm_check_handler) |
c185b783 | 388 | stpt __LC_SYNC_ENTER_TIMER |
c5328901 MS |
389 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
390 | lg %r10,__LC_LAST_BREAK | |
391 | lg %r12,__LC_THREAD_INFO | |
392 | larl %r13,system_call | |
393 | lmg %r8,%r9,__LC_PGM_OLD_PSW | |
394 | HANDLE_SIE_INTERCEPT %r14 | |
395 | tmhh %r8,0x0001 # test problem state bit | |
396 | jnz 1f # -> fault in user space | |
397 | tmhh %r8,0x4000 # PER bit set in old PSW ? | |
398 | jnz 0f # -> enabled, can't be a double fault | |
399 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
400 | jnz pgm_svcper # -> single stepped svc | |
401 | 0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC | |
402 | j 2f | |
403 | 1: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER | |
404 | LAST_BREAK %r14 | |
405 | lg %r15,__LC_KERNEL_STACK | |
d35339a4 MS |
406 | lg %r14,__TI_task(%r12) |
407 | lghi %r13,__LC_PGM_TDB | |
408 | tm __LC_PGM_ILC+2,0x02 # check for transaction abort | |
409 | jz 2f | |
410 | mvc __THREAD_trap_tdb(256,%r14),0(%r13) | |
c5328901 MS |
411 | 2: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
412 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
413 | stmg %r0,%r7,__PT_R0(%r11) | |
414 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
415 | stmg %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
416 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
417 | mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE | |
c5328901 MS |
418 | stg %r10,__PT_ARGS(%r11) |
419 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
420 | jz 0f | |
c5328901 MS |
421 | tmhh %r8,0x0001 # kernel per event ? |
422 | jz pgm_kprobe | |
423 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
d35339a4 MS |
424 | mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS |
425 | mvc __THREAD_per_cause(2,%r14),__LC_PER_CAUSE | |
426 | mvc __THREAD_per_paid(1,%r14),__LC_PER_PAID | |
aa33c8cb | 427 | 0: REENABLE_IRQS |
c5328901 | 428 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f5cdac27 | 429 | larl %r1,pgm_check_table |
aa33c8cb MS |
430 | llgh %r10,__PT_INT_CODE+2(%r11) |
431 | nill %r10,0x007f | |
432 | sll %r10,3 | |
433 | je sysc_return | |
c5328901 MS |
434 | lg %r1,0(%r10,%r1) # load address of handler routine |
435 | lgr %r2,%r11 # pass pointer to pt_regs | |
f5cdac27 | 436 | basr %r14,%r1 # branch to interrupt-handler |
f5cdac27 | 437 | j sysc_return |
1da177e4 LT |
438 | |
439 | # | |
c5328901 | 440 | # PER event in supervisor state, must be kprobes |
1da177e4 | 441 | # |
c5328901 MS |
442 | pgm_kprobe: |
443 | REENABLE_IRQS | |
444 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
445 | lgr %r2,%r11 # pass pointer to pt_regs | |
446 | brasl %r14,do_per_trap | |
447 | j sysc_return | |
1da177e4 | 448 | |
4ba069b8 | 449 | # |
c5328901 | 450 | # single stepped system call |
4ba069b8 | 451 | # |
c5328901 MS |
452 | pgm_svcper: |
453 | oi __TI_flags+7(%r12),_TIF_PER_TRAP | |
454 | mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW | |
455 | larl %r14,sysc_per | |
456 | stg %r14,__LC_RETURN_PSW+8 | |
457 | lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs | |
4ba069b8 | 458 | |
1da177e4 LT |
459 | /* |
460 | * IO interrupt handler routine | |
461 | */ | |
144d634a | 462 | ENTRY(io_int_handler) |
473e66ba | 463 | STCK __LC_INT_CLOCK |
9cfb9b3c | 464 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
465 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
466 | lg %r10,__LC_LAST_BREAK | |
467 | lg %r12,__LC_THREAD_INFO | |
468 | larl %r13,system_call | |
469 | lmg %r8,%r9,__LC_IO_OLD_PSW | |
470 | HANDLE_SIE_INTERCEPT %r14 | |
471 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
472 | tmhh %r8,0x0001 # interrupting from user? | |
473 | jz io_skip | |
474 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
475 | LAST_BREAK %r14 | |
476 | io_skip: | |
477 | stmg %r0,%r7,__PT_R0(%r11) | |
478 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
479 | stmg %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 480 | TRACE_IRQS_OFF |
c5328901 MS |
481 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
482 | lgr %r2,%r11 # pass pointer to pt_regs | |
483 | brasl %r14,do_IRQ | |
1da177e4 | 484 | io_return: |
6a2df3a8 MS |
485 | LOCKDEP_SYS_EXIT |
486 | TRACE_IRQS_ON | |
487 | io_tif: | |
86f2552b | 488 | tm __TI_flags+7(%r12),_TIF_WORK_INT |
25d83cbf | 489 | jnz io_work # there is work to do (signals etc.) |
411788ea | 490 | io_restore: |
c5328901 MS |
491 | lg %r14,__LC_VDSO_PER_CPU |
492 | lmg %r0,%r10,__PT_R0(%r11) | |
493 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
c5328901 MS |
494 | stpt __LC_EXIT_TIMER |
495 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
496 | lmg %r11,%r15,__PT_R11(%r11) | |
497 | lpswe __LC_RETURN_PSW | |
ae6aa2ea | 498 | io_done: |
1da177e4 | 499 | |
2688905e | 500 | # |
43d399d2 MS |
501 | # There is work todo, find out in which context we have been interrupted: |
502 | # 1) if we return to user space we can do all _TIF_WORK_INT work | |
503 | # 2) if we return to kernel code and kvm is enabled check if we need to | |
504 | # modify the psw to leave SIE | |
505 | # 3) if we return to kernel code and preemptive scheduling is enabled check | |
506 | # the preemption counter and if it is zero call preempt_schedule_irq | |
507 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e MS |
508 | # |
509 | io_work: | |
c5328901 | 510 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
43d399d2 | 511 | jo io_work_user # yes -> do resched & signal |
43d399d2 | 512 | #ifdef CONFIG_PREEMPT |
2688905e | 513 | # check for preemptive scheduling |
86f2552b | 514 | icm %r0,15,__TI_precount(%r12) |
2688905e | 515 | jnz io_restore # preemption is disabled |
6a2df3a8 MS |
516 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
517 | jno io_restore | |
1da177e4 | 518 | # switch to kernel stack |
c5328901 MS |
519 | lg %r1,__PT_R15(%r11) |
520 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
521 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
522 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
523 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 524 | lgr %r15,%r1 |
6a2df3a8 MS |
525 | # TRACE_IRQS_ON already done at io_return, call |
526 | # TRACE_IRQS_OFF to keep things symmetrical | |
527 | TRACE_IRQS_OFF | |
528 | brasl %r14,preempt_schedule_irq | |
529 | j io_return | |
530 | #else | |
43d399d2 | 531 | j io_restore |
6a2df3a8 | 532 | #endif |
1da177e4 | 533 | |
43d399d2 MS |
534 | # |
535 | # Need to do work before returning to userspace, switch to kernel stack | |
536 | # | |
2688905e | 537 | io_work_user: |
1da177e4 | 538 | lg %r1,__LC_KERNEL_STACK |
c5328901 MS |
539 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
540 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
541 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
542 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 543 | lgr %r15,%r1 |
43d399d2 | 544 | |
1da177e4 LT |
545 | # |
546 | # One of the work bits is on. Find out which one. | |
43d399d2 | 547 | # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
54dfe5dd | 548 | # and _TIF_MCCK_PENDING |
1da177e4 | 549 | # |
6a2df3a8 | 550 | io_work_tif: |
86f2552b | 551 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 552 | jo io_mcck_pending |
86f2552b | 553 | tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
1da177e4 | 554 | jo io_reschedule |
86f2552b | 555 | tm __TI_flags+7(%r12),_TIF_SIGPENDING |
43d399d2 | 556 | jo io_sigpending |
86f2552b | 557 | tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
43d399d2 MS |
558 | jo io_notify_resume |
559 | j io_return # beware of critical section cleanup | |
0eaeafa1 | 560 | |
77fa2245 HC |
561 | # |
562 | # _TIF_MCCK_PENDING is set, call handler | |
563 | # | |
564 | io_mcck_pending: | |
6a2df3a8 | 565 | # TRACE_IRQS_ON already done at io_return |
b771aeac | 566 | brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler |
6a2df3a8 MS |
567 | TRACE_IRQS_OFF |
568 | j io_return | |
77fa2245 | 569 | |
1da177e4 LT |
570 | # |
571 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf HC |
572 | # |
573 | io_reschedule: | |
6a2df3a8 | 574 | # TRACE_IRQS_ON already done at io_return |
c5328901 | 575 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 576 | brasl %r14,schedule # call scheduler |
c5328901 | 577 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 578 | TRACE_IRQS_OFF |
6a2df3a8 | 579 | j io_return |
1da177e4 LT |
580 | |
581 | # | |
02a029b3 | 582 | # _TIF_SIGPENDING or is set, call do_signal |
1da177e4 | 583 | # |
25d83cbf | 584 | io_sigpending: |
6a2df3a8 | 585 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
586 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
587 | lgr %r2,%r11 # pass pointer to pt_regs | |
588 | brasl %r14,do_signal | |
589 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
411788ea | 590 | TRACE_IRQS_OFF |
6a2df3a8 | 591 | j io_return |
1da177e4 | 592 | |
753c4dd6 MS |
593 | # |
594 | # _TIF_NOTIFY_RESUME or is set, call do_notify_resume | |
595 | # | |
596 | io_notify_resume: | |
6a2df3a8 | 597 | # TRACE_IRQS_ON already done at io_return |
c5328901 MS |
598 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
599 | lgr %r2,%r11 # pass pointer to pt_regs | |
600 | brasl %r14,do_notify_resume | |
601 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 602 | TRACE_IRQS_OFF |
6a2df3a8 | 603 | j io_return |
753c4dd6 | 604 | |
1da177e4 LT |
605 | /* |
606 | * External interrupt handler routine | |
607 | */ | |
144d634a | 608 | ENTRY(ext_int_handler) |
473e66ba | 609 | STCK __LC_INT_CLOCK |
9cfb9b3c | 610 | stpt __LC_ASYNC_ENTER_TIMER |
c5328901 MS |
611 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
612 | lg %r10,__LC_LAST_BREAK | |
613 | lg %r12,__LC_THREAD_INFO | |
614 | larl %r13,system_call | |
615 | lmg %r8,%r9,__LC_EXT_OLD_PSW | |
616 | HANDLE_SIE_INTERCEPT %r14 | |
617 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT | |
618 | tmhh %r8,0x0001 # interrupting from user ? | |
619 | jz ext_skip | |
620 | UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER | |
621 | LAST_BREAK %r14 | |
622 | ext_skip: | |
623 | stmg %r0,%r7,__PT_R0(%r11) | |
624 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
625 | stmg %r8,%r9,__PT_PSW(%r11) | |
1f194a4c | 626 | TRACE_IRQS_OFF |
0de9db37 | 627 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f6649a7e | 628 | lghi %r1,4096 |
c5328901 | 629 | lgr %r2,%r11 # pass pointer to pt_regs |
7e180bd8 | 630 | llgf %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code |
f6649a7e MS |
631 | llgf %r4,__LC_EXT_PARAMS # get external parameter |
632 | lg %r5,__LC_EXT_PARAMS2-4096(%r1) # get 64 bit external parameter | |
25d83cbf | 633 | brasl %r14,do_extint |
1da177e4 LT |
634 | j io_return |
635 | ||
4c1051e3 MS |
636 | /* |
637 | * Load idle PSW. The second "half" of this function is in cleanup_idle. | |
638 | */ | |
639 | ENTRY(psw_idle) | |
27f6b416 | 640 | stg %r3,__SF_EMPTY(%r15) |
4c1051e3 MS |
641 | larl %r1,psw_idle_lpsw+4 |
642 | stg %r1,__SF_EMPTY+8(%r15) | |
27f6b416 MS |
643 | STCK __CLOCK_IDLE_ENTER(%r2) |
644 | stpt __TIMER_IDLE_ENTER(%r2) | |
4c1051e3 MS |
645 | psw_idle_lpsw: |
646 | lpswe __SF_EMPTY(%r15) | |
647 | br %r14 | |
648 | psw_idle_end: | |
649 | ||
ae6aa2ea MS |
650 | __critical_end: |
651 | ||
1da177e4 LT |
652 | /* |
653 | * Machine check handler routines | |
654 | */ | |
144d634a | 655 | ENTRY(mcck_int_handler) |
473e66ba | 656 | STCK __LC_MCCK_CLOCK |
77fa2245 HC |
657 | la %r1,4095 # revalidate r1 |
658 | spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer | |
25d83cbf | 659 | lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs |
c5328901 MS |
660 | lg %r10,__LC_LAST_BREAK |
661 | lg %r12,__LC_THREAD_INFO | |
86f2552b | 662 | larl %r13,system_call |
c5328901 MS |
663 | lmg %r8,%r9,__LC_MCK_OLD_PSW |
664 | HANDLE_SIE_INTERCEPT %r14 | |
25d83cbf | 665 | tm __LC_MCCK_CODE,0x80 # system damage? |
c5328901 MS |
666 | jo mcck_panic # yes -> rest of mcck code invalid |
667 | lghi %r14,__LC_CPU_TIMER_SAVE_AREA | |
668 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
63b12246 | 669 | tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
c5328901 | 670 | jo 3f |
63b12246 MS |
671 | la %r14,__LC_SYNC_ENTER_TIMER |
672 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
673 | jl 0f | |
674 | la %r14,__LC_ASYNC_ENTER_TIMER | |
675 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 676 | jl 1f |
63b12246 | 677 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
678 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
679 | jl 2f | |
63b12246 | 680 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 681 | 2: spt 0(%r14) |
6377981f | 682 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
c5328901 MS |
683 | 3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? |
684 | jno mcck_panic # no -> skip cleanup critical | |
685 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT | |
686 | tm %r8,0x0001 # interrupting from user ? | |
687 | jz mcck_skip | |
688 | UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER | |
689 | LAST_BREAK %r14 | |
690 | mcck_skip: | |
691 | lghi %r14,__LC_GPREGS_SAVE_AREA | |
692 | mvc __PT_R0(128,%r11),0(%r14) | |
693 | stmg %r8,%r9,__PT_PSW(%r11) | |
694 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
695 | lgr %r2,%r11 # pass pointer to pt_regs | |
77fa2245 | 696 | brasl %r14,s390_do_machine_check |
c5328901 | 697 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
77fa2245 HC |
698 | jno mcck_return |
699 | lg %r1,__LC_KERNEL_STACK # switch to kernel stack | |
c5328901 MS |
700 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
701 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
702 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
703 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
77fa2245 | 704 | lgr %r15,%r1 |
c5328901 | 705 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
86f2552b | 706 | tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
77fa2245 | 707 | jno mcck_return |
1f194a4c | 708 | TRACE_IRQS_OFF |
77fa2245 | 709 | brasl %r14,s390_handle_mcck |
1f194a4c | 710 | TRACE_IRQS_ON |
1da177e4 | 711 | mcck_return: |
c5328901 MS |
712 | lg %r14,__LC_VDSO_PER_CPU |
713 | lmg %r0,%r10,__PT_R0(%r11) | |
714 | mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW | |
63b12246 MS |
715 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
716 | jno 0f | |
717 | stpt __LC_EXIT_TIMER | |
c5328901 MS |
718 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
719 | 0: lmg %r11,%r15,__PT_R11(%r11) | |
720 | lpswe __LC_RETURN_MCCK_PSW | |
721 | ||
722 | mcck_panic: | |
723 | lg %r14,__LC_PANIC_STACK | |
724 | slgr %r14,%r15 | |
725 | srag %r14,%r14,PAGE_SHIFT | |
726 | jz 0f | |
727 | lg %r15,__LC_PANIC_STACK | |
728 | 0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
729 | j mcck_skip | |
1da177e4 | 730 | |
7dd6b334 MH |
731 | # |
732 | # PSW restart interrupt handler | |
733 | # | |
8b646bd7 | 734 | ENTRY(restart_int_handler) |
c5328901 | 735 | stg %r15,__LC_SAVE_AREA_RESTART |
8b646bd7 | 736 | lg %r15,__LC_RESTART_STACK |
c5328901 | 737 | aghi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 738 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
739 | stmg %r0,%r14,__PT_R0(%r15) |
740 | mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART | |
741 | mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
742 | aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
743 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
744 | lg %r1,__LC_RESTART_FN # load fn, parm & source cpu |
745 | lg %r2,__LC_RESTART_DATA | |
746 | lg %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
747 | ltgr %r3,%r3 # test source cpu address |
748 | jm 1f # negative -> skip source stop | |
eb546195 | 749 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
750 | brc 10,0b # wait for status stored |
751 | 1: basr %r14,%r1 # call function | |
752 | stap __SF_EMPTY(%r15) # store cpu address | |
753 | llgh %r3,__SF_EMPTY(%r15) | |
eb546195 | 754 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
755 | brc 2,2b |
756 | 3: j 3b | |
7dd6b334 | 757 | |
860dba45 MS |
758 | .section .kprobes.text, "ax" |
759 | ||
1da177e4 LT |
760 | #ifdef CONFIG_CHECK_STACK |
761 | /* | |
762 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
763 | * No need to properly save the registers, we are going to panic anyway. | |
764 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
765 | */ | |
766 | stack_overflow: | |
c5328901 MS |
767 | lg %r11,__LC_PANIC_STACK # change to panic stack |
768 | aghi %r11,-__PT_SIZE # create pt_regs | |
769 | stmg %r0,%r7,__PT_R0(%r11) | |
770 | stmg %r8,%r9,__PT_PSW(%r11) | |
771 | mvc __PT_R8(64,%r11),0(%r14) | |
772 | stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 | |
773 | lgr %r15,%r11 | |
774 | aghi %r15,-STACK_FRAME_OVERHEAD | |
775 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
776 | lgr %r2,%r11 # pass pointer to pt_regs | |
1da177e4 LT |
777 | jg kernel_stack_overflow |
778 | #endif | |
779 | ||
c5328901 MS |
780 | .align 8 |
781 | cleanup_table: | |
782 | .quad system_call | |
783 | .quad sysc_do_svc | |
784 | .quad sysc_tif | |
785 | .quad sysc_restore | |
786 | .quad sysc_done | |
787 | .quad io_tif | |
788 | .quad io_restore | |
789 | .quad io_done | |
4c1051e3 MS |
790 | .quad psw_idle |
791 | .quad psw_idle_end | |
1da177e4 LT |
792 | |
793 | cleanup_critical: | |
c5328901 | 794 | clg %r9,BASED(cleanup_table) # system_call |
1da177e4 | 795 | jl 0f |
c5328901 | 796 | clg %r9,BASED(cleanup_table+8) # sysc_do_svc |
1da177e4 | 797 | jl cleanup_system_call |
c5328901 | 798 | clg %r9,BASED(cleanup_table+16) # sysc_tif |
1da177e4 | 799 | jl 0f |
c5328901 | 800 | clg %r9,BASED(cleanup_table+24) # sysc_restore |
6a2df3a8 | 801 | jl cleanup_sysc_tif |
c5328901 | 802 | clg %r9,BASED(cleanup_table+32) # sysc_done |
6a2df3a8 | 803 | jl cleanup_sysc_restore |
c5328901 | 804 | clg %r9,BASED(cleanup_table+40) # io_tif |
63b12246 | 805 | jl 0f |
c5328901 | 806 | clg %r9,BASED(cleanup_table+48) # io_restore |
6a2df3a8 | 807 | jl cleanup_io_tif |
c5328901 | 808 | clg %r9,BASED(cleanup_table+56) # io_done |
6a2df3a8 | 809 | jl cleanup_io_restore |
4c1051e3 MS |
810 | clg %r9,BASED(cleanup_table+64) # psw_idle |
811 | jl 0f | |
812 | clg %r9,BASED(cleanup_table+72) # psw_idle_end | |
813 | jl cleanup_idle | |
c5328901 MS |
814 | 0: br %r14 |
815 | ||
1da177e4 LT |
816 | |
817 | cleanup_system_call: | |
c5328901 MS |
818 | # check if stpt has been executed |
819 | clg %r9,BASED(cleanup_system_call_insn) | |
1da177e4 LT |
820 | jh 0f |
821 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
c5328901 | 822 | cghi %r11,__LC_SAVE_AREA_ASYNC |
6377981f | 823 | je 0f |
c5328901 MS |
824 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
825 | 0: # check if stmg has been executed | |
826 | clg %r9,BASED(cleanup_system_call_insn+8) | |
1da177e4 | 827 | jh 0f |
c5328901 MS |
828 | mvc __LC_SAVE_AREA_SYNC(64),0(%r11) |
829 | 0: # check if base register setup + TIF bit load has been done | |
830 | clg %r9,BASED(cleanup_system_call_insn+16) | |
831 | jhe 0f | |
832 | # set up saved registers r10 and r12 | |
833 | stg %r10,16(%r11) # r10 last break | |
834 | stg %r12,32(%r11) # r12 thread-info pointer | |
835 | 0: # check if the user time update has been done | |
836 | clg %r9,BASED(cleanup_system_call_insn+24) | |
837 | jh 0f | |
838 | lg %r15,__LC_EXIT_TIMER | |
839 | slg %r15,__LC_SYNC_ENTER_TIMER | |
840 | alg %r15,__LC_USER_TIMER | |
841 | stg %r15,__LC_USER_TIMER | |
842 | 0: # check if the system time update has been done | |
843 | clg %r9,BASED(cleanup_system_call_insn+32) | |
844 | jh 0f | |
845 | lg %r15,__LC_LAST_UPDATE_TIMER | |
846 | slg %r15,__LC_EXIT_TIMER | |
847 | alg %r15,__LC_SYSTEM_TIMER | |
848 | stg %r15,__LC_SYSTEM_TIMER | |
849 | 0: # update accounting time stamp | |
1da177e4 | 850 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
c5328901 MS |
851 | # do LAST_BREAK |
852 | lg %r9,16(%r11) | |
853 | srag %r9,%r9,23 | |
86f2552b | 854 | jz 0f |
c5328901 MS |
855 | mvc __TI_last_break(8,%r12),16(%r11) |
856 | 0: # set up saved register r11 | |
857 | lg %r15,__LC_KERNEL_STACK | |
858 | aghi %r15,-__PT_SIZE | |
859 | stg %r15,24(%r11) # r11 pt_regs pointer | |
860 | # fill pt_regs | |
861 | mvc __PT_R8(64,%r15),__LC_SAVE_AREA_SYNC | |
862 | stmg %r0,%r7,__PT_R0(%r15) | |
863 | mvc __PT_PSW(16,%r15),__LC_SVC_OLD_PSW | |
aa33c8cb | 864 | mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC |
c5328901 MS |
865 | # setup saved register r15 |
866 | aghi %r15,-STACK_FRAME_OVERHEAD | |
867 | stg %r15,56(%r11) # r15 stack pointer | |
868 | # set new psw address and exit | |
869 | larl %r9,sysc_do_svc | |
1da177e4 LT |
870 | br %r14 |
871 | cleanup_system_call_insn: | |
25d83cbf | 872 | .quad system_call |
c5328901 MS |
873 | .quad sysc_stmg |
874 | .quad sysc_per | |
875 | .quad sysc_vtime+18 | |
876 | .quad sysc_vtime+42 | |
1da177e4 | 877 | |
6a2df3a8 | 878 | cleanup_sysc_tif: |
c5328901 | 879 | larl %r9,sysc_tif |
1da177e4 LT |
880 | br %r14 |
881 | ||
6a2df3a8 | 882 | cleanup_sysc_restore: |
c5328901 | 883 | clg %r9,BASED(cleanup_sysc_restore_insn) |
6377981f | 884 | je 0f |
c5328901 MS |
885 | lg %r9,24(%r11) # get saved pointer to pt_regs |
886 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
887 | mvc 0(64,%r11),__PT_R8(%r9) | |
888 | lmg %r0,%r7,__PT_R0(%r9) | |
889 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
1da177e4 | 890 | br %r14 |
6a2df3a8 | 891 | cleanup_sysc_restore_insn: |
411788ea | 892 | .quad sysc_done - 4 |
1da177e4 | 893 | |
6a2df3a8 | 894 | cleanup_io_tif: |
c5328901 | 895 | larl %r9,io_tif |
176b1803 MS |
896 | br %r14 |
897 | ||
6a2df3a8 | 898 | cleanup_io_restore: |
c5328901 MS |
899 | clg %r9,BASED(cleanup_io_restore_insn) |
900 | je 0f | |
901 | lg %r9,24(%r11) # get saved r11 pointer to pt_regs | |
902 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
c5328901 MS |
903 | mvc 0(64,%r11),__PT_R8(%r9) |
904 | lmg %r0,%r7,__PT_R0(%r9) | |
905 | 0: lmg %r8,%r9,__LC_RETURN_PSW | |
ae6aa2ea | 906 | br %r14 |
6a2df3a8 | 907 | cleanup_io_restore_insn: |
411788ea | 908 | .quad io_done - 4 |
ae6aa2ea | 909 | |
4c1051e3 MS |
910 | cleanup_idle: |
911 | # copy interrupt clock & cpu timer | |
27f6b416 MS |
912 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK |
913 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER | |
4c1051e3 MS |
914 | cghi %r11,__LC_SAVE_AREA_ASYNC |
915 | je 0f | |
27f6b416 MS |
916 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK |
917 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER | |
4c1051e3 MS |
918 | 0: # check if stck & stpt have been executed |
919 | clg %r9,BASED(cleanup_idle_insn) | |
920 | jhe 1f | |
27f6b416 MS |
921 | mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) |
922 | mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) | |
923 | 1: # account system time going idle | |
4c1051e3 | 924 | lg %r9,__LC_STEAL_TIMER |
27f6b416 | 925 | alg %r9,__CLOCK_IDLE_ENTER(%r2) |
4c1051e3 MS |
926 | slg %r9,__LC_LAST_UPDATE_CLOCK |
927 | stg %r9,__LC_STEAL_TIMER | |
27f6b416 | 928 | mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) |
4c1051e3 MS |
929 | lg %r9,__LC_SYSTEM_TIMER |
930 | alg %r9,__LC_LAST_UPDATE_TIMER | |
27f6b416 | 931 | slg %r9,__TIMER_IDLE_ENTER(%r2) |
4c1051e3 | 932 | stg %r9,__LC_SYSTEM_TIMER |
27f6b416 | 933 | mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) |
4c1051e3 MS |
934 | # prepare return psw |
935 | nihh %r8,0xfffd # clear wait state bit | |
936 | lg %r9,48(%r11) # return from psw_idle | |
937 | br %r14 | |
938 | cleanup_idle_insn: | |
939 | .quad psw_idle_lpsw | |
940 | ||
1da177e4 LT |
941 | /* |
942 | * Integer constants | |
943 | */ | |
c5328901 | 944 | .align 8 |
1da177e4 | 945 | .Lcritical_start: |
c5328901 MS |
946 | .quad __critical_start |
947 | .Lcritical_length: | |
948 | .quad __critical_end - __critical_start | |
949 | ||
1da177e4 | 950 | |
603d1a50 MS |
951 | #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
952 | /* | |
953 | * sie64a calling convention: | |
954 | * %r2 pointer to sie control block | |
955 | * %r3 guest register save area | |
956 | */ | |
144d634a | 957 | ENTRY(sie64a) |
603d1a50 MS |
958 | stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers |
959 | stg %r2,__SF_EMPTY(%r15) # save control block pointer | |
960 | stg %r3,__SF_EMPTY+8(%r15) # save guest register save area | |
ddd6f953 | 961 | xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # host id == 0 |
603d1a50 | 962 | lmg %r0,%r13,0(%r3) # load guest gprs 0-13 |
603d1a50 MS |
963 | sie_loop: |
964 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct | |
965 | tm __TI_flags+7(%r14),_TIF_EXIT_SIE | |
966 | jnz sie_exit | |
480e5926 CB |
967 | lg %r14,__LC_GMAP # get gmap pointer |
968 | ltgr %r14,%r14 | |
969 | jz sie_gmap | |
970 | lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce | |
971 | sie_gmap: | |
603d1a50 MS |
972 | lg %r14,__SF_EMPTY(%r15) # get control block pointer |
973 | SPP __SF_EMPTY(%r15) # set guest id | |
974 | sie 0(%r14) | |
975 | sie_done: | |
ddd6f953 | 976 | SPP __SF_EMPTY+16(%r15) # set host id |
603d1a50 MS |
977 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
978 | sie_exit: | |
480e5926 | 979 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
603d1a50 MS |
980 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
981 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
982 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
983 | lghi %r2,0 | |
984 | br %r14 | |
985 | sie_fault: | |
69ba9743 | 986 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
603d1a50 | 987 | lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
603d1a50 MS |
988 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
989 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
990 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
991 | lghi %r2,-EFAULT | |
992 | br %r14 | |
993 | ||
994 | .align 8 | |
995 | .Lsie_loop: | |
996 | .quad sie_loop | |
c5328901 MS |
997 | .Lsie_length: |
998 | .quad sie_done - sie_loop | |
ddd6f953 MS |
999 | .Lhost_id: |
1000 | .quad 0 | |
603d1a50 | 1001 | |
eb608fb3 | 1002 | EX_TABLE(sie_loop,sie_fault) |
603d1a50 MS |
1003 | #endif |
1004 | ||
25d83cbf | 1005 | .section .rodata, "a" |
1da177e4 | 1006 | #define SYSCALL(esa,esame,emu) .long esame |
9bf1226b | 1007 | .globl sys_call_table |
1da177e4 LT |
1008 | sys_call_table: |
1009 | #include "syscalls.S" | |
1010 | #undef SYSCALL | |
1011 | ||
347a8dc3 | 1012 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
1013 | |
1014 | #define SYSCALL(esa,esame,emu) .long emu | |
1da177e4 LT |
1015 | sys_call_table_emu: |
1016 | #include "syscalls.S" | |
1017 | #undef SYSCALL | |
1018 | #endif |