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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> |
1f44a225 | 22 | #include <asm/irq.h> |
9977e886 | 23 | #include <asm/vx-insn.h> |
83abeffb HB |
24 | #include <asm/setup.h> |
25 | #include <asm/nmi.h> | |
711f5df7 | 26 | #include <asm/export.h> |
1da177e4 | 27 | |
c5328901 MS |
28 | __PT_R0 = __PT_GPRS |
29 | __PT_R1 = __PT_GPRS + 8 | |
30 | __PT_R2 = __PT_GPRS + 16 | |
31 | __PT_R3 = __PT_GPRS + 24 | |
32 | __PT_R4 = __PT_GPRS + 32 | |
33 | __PT_R5 = __PT_GPRS + 40 | |
34 | __PT_R6 = __PT_GPRS + 48 | |
35 | __PT_R7 = __PT_GPRS + 56 | |
36 | __PT_R8 = __PT_GPRS + 64 | |
37 | __PT_R9 = __PT_GPRS + 72 | |
38 | __PT_R10 = __PT_GPRS + 80 | |
39 | __PT_R11 = __PT_GPRS + 88 | |
40 | __PT_R12 = __PT_GPRS + 96 | |
41 | __PT_R13 = __PT_GPRS + 104 | |
42 | __PT_R14 = __PT_GPRS + 112 | |
43 | __PT_R15 = __PT_GPRS + 120 | |
1da177e4 | 44 | |
3a890380 | 45 | STACK_SHIFT = PAGE_SHIFT + THREAD_SIZE_ORDER |
1da177e4 | 46 | STACK_SIZE = 1 << STACK_SHIFT |
dc7ee00d | 47 | STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE |
1da177e4 | 48 | |
2a0a5b22 | 49 | _TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
76f1948a | 50 | _TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING) |
d3a73acb MS |
51 | _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
52 | _TIF_SYSCALL_TRACEPOINT) | |
b5a882fc HC |
53 | _CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE_PRIMARY | \ |
54 | _CIF_ASCE_SECONDARY | _CIF_FPU) | |
23fefe11 | 55 | _PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART) |
1da177e4 | 56 | |
9977e886 | 57 | #define BASED(name) name-cleanup_critical(%r13) |
1da177e4 | 58 | |
1f194a4c | 59 | .macro TRACE_IRQS_ON |
c5328901 | 60 | #ifdef CONFIG_TRACE_IRQFLAGS |
6a2df3a8 MS |
61 | basr %r2,%r0 |
62 | brasl %r14,trace_hardirqs_on_caller | |
c5328901 | 63 | #endif |
1f194a4c HC |
64 | .endm |
65 | ||
66 | .macro TRACE_IRQS_OFF | |
c5328901 | 67 | #ifdef CONFIG_TRACE_IRQFLAGS |
6a2df3a8 MS |
68 | basr %r2,%r0 |
69 | brasl %r14,trace_hardirqs_off_caller | |
411788ea | 70 | #endif |
c5328901 | 71 | .endm |
411788ea | 72 | |
411788ea | 73 | .macro LOCKDEP_SYS_EXIT |
c5328901 MS |
74 | #ifdef CONFIG_LOCKDEP |
75 | tm __PT_PSW+1(%r11),0x01 # returning to user ? | |
76 | jz .+10 | |
411788ea | 77 | brasl %r14,lockdep_sys_exit |
1f194a4c | 78 | #endif |
1da177e4 | 79 | .endm |
1da177e4 | 80 | |
c5328901 | 81 | .macro CHECK_STACK stacksize,savearea |
63b12246 | 82 | #ifdef CONFIG_CHECK_STACK |
c5328901 MS |
83 | tml %r15,\stacksize - CONFIG_STACK_GUARD |
84 | lghi %r14,\savearea | |
85 | jz stack_overflow | |
63b12246 | 86 | #endif |
63b12246 MS |
87 | .endm |
88 | ||
2acb94f4 | 89 | .macro SWITCH_ASYNC savearea,timer |
c5328901 MS |
90 | tmhh %r8,0x0001 # interrupting from user ? |
91 | jnz 1f | |
92 | lgr %r14,%r9 | |
93 | slg %r14,BASED(.Lcritical_start) | |
94 | clg %r14,BASED(.Lcritical_length) | |
1da177e4 | 95 | jhe 0f |
c5328901 | 96 | lghi %r11,\savearea # inside critical section, do cleanup |
1da177e4 | 97 | brasl %r14,cleanup_critical |
c5328901 | 98 | tmhh %r8,0x0001 # retest problem state after cleanup |
1da177e4 | 99 | jnz 1f |
2acb94f4 | 100 | 0: lg %r14,__LC_ASYNC_STACK # are we already on the async stack? |
1da177e4 | 101 | slgr %r14,%r15 |
2acb94f4 | 102 | srag %r14,%r14,STACK_SHIFT |
a359bb11 | 103 | jnz 2f |
2acb94f4 | 104 | CHECK_STACK 1<<STACK_SHIFT,\savearea |
dc7ee00d | 105 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
a359bb11 | 106 | j 3f |
34525e1f | 107 | 1: UPDATE_VTIME %r14,%r15,\timer |
2acb94f4 | 108 | 2: lg %r15,__LC_ASYNC_STACK # load async stack |
a359bb11 | 109 | 3: la %r11,STACK_FRAME_OVERHEAD(%r15) |
25d83cbf | 110 | .endm |
1da177e4 | 111 | |
a359bb11 MS |
112 | .macro UPDATE_VTIME w1,w2,enter_timer |
113 | lg \w1,__LC_EXIT_TIMER | |
114 | lg \w2,__LC_LAST_UPDATE_TIMER | |
115 | slg \w1,\enter_timer | |
116 | slg \w2,__LC_EXIT_TIMER | |
117 | alg \w1,__LC_USER_TIMER | |
118 | alg \w2,__LC_SYSTEM_TIMER | |
119 | stg \w1,__LC_USER_TIMER | |
120 | stg \w2,__LC_SYSTEM_TIMER | |
c5328901 | 121 | mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer |
1da177e4 LT |
122 | .endm |
123 | ||
1e54622e | 124 | .macro REENABLE_IRQS |
c5328901 MS |
125 | stg %r8,__LC_RETURN_PSW |
126 | ni __LC_RETURN_PSW,0xbf | |
127 | ssm __LC_RETURN_PSW | |
1e54622e MS |
128 | .endm |
129 | ||
473e66ba | 130 | .macro STCK savearea |
d652d596 | 131 | #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES |
473e66ba HC |
132 | .insn s,0xb27c0000,\savearea # store clock fast |
133 | #else | |
134 | .insn s,0xb2050000,\savearea # store clock | |
135 | #endif | |
136 | .endm | |
137 | ||
83abeffb HB |
138 | /* |
139 | * The TSTMSK macro generates a test-under-mask instruction by | |
140 | * calculating the memory offset for the specified mask value. | |
141 | * Mask value can be any constant. The macro shifts the mask | |
142 | * value to calculate the memory offset for the test-under-mask | |
143 | * instruction. | |
144 | */ | |
145 | .macro TSTMSK addr, mask, size=8, bytepos=0 | |
146 | .if (\bytepos < \size) && (\mask >> 8) | |
147 | .if (\mask & 0xff) | |
148 | .error "Mask exceeds byte boundary" | |
149 | .endif | |
150 | TSTMSK \addr, "(\mask >> 8)", \size, "(\bytepos + 1)" | |
151 | .exitm | |
152 | .endif | |
153 | .ifeq \mask | |
154 | .error "Mask must not be zero" | |
155 | .endif | |
156 | off = \size - \bytepos - 1 | |
157 | tm off+\addr, \mask | |
158 | .endm | |
159 | ||
73912dda MS |
160 | .macro BPOFF |
161 | .pushsection .altinstr_replacement, "ax" | |
162 | 660: .long 0xb2e8c000 | |
163 | .popsection | |
164 | 661: .long 0x47000000 | |
165 | .pushsection .altnobp, "a" | |
166 | .long 661b - . | |
167 | .long 660b - . | |
168 | .word 82 | |
169 | .byte 4 | |
170 | .byte 4 | |
171 | .popsection | |
172 | .endm | |
173 | ||
174 | .macro BPON | |
175 | .pushsection .altinstr_replacement, "ax" | |
176 | 662: .long 0xb2e8d000 | |
177 | .popsection | |
178 | 663: .long 0x47000000 | |
179 | .pushsection .altnobp, "a" | |
180 | .long 663b - . | |
181 | .long 662b - . | |
182 | .word 82 | |
183 | .byte 4 | |
184 | .byte 4 | |
185 | .popsection | |
186 | .endm | |
187 | ||
860dba45 | 188 | .section .kprobes.text, "ax" |
46210c44 HC |
189 | .Ldummy: |
190 | /* | |
191 | * This nop exists only in order to avoid that __switch_to starts at | |
192 | * the beginning of the kprobes text section. In that case we would | |
193 | * have several symbols at the same address. E.g. objdump would take | |
194 | * an arbitrary symbol name when disassembling this code. | |
195 | * With the added nop in between the __switch_to symbol is unique | |
196 | * again. | |
197 | */ | |
198 | nop 0 | |
860dba45 | 199 | |
73912dda MS |
200 | ENTRY(__bpon) |
201 | .globl __bpon | |
202 | BPON | |
203 | br %r14 | |
204 | ||
1da177e4 LT |
205 | /* |
206 | * Scheduler resume function, called by switch_to | |
207 | * gpr2 = (task_struct *) prev | |
208 | * gpr3 = (task_struct *) next | |
209 | * Returns: | |
210 | * gpr2 = prev | |
211 | */ | |
144d634a | 212 | ENTRY(__switch_to) |
eda0c6d6 | 213 | stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
3827ec3d MS |
214 | lgr %r1,%r2 |
215 | aghi %r1,__TASK_thread # thread_struct of prev task | |
d5c352cd | 216 | lg %r5,__TASK_stack(%r3) # start of kernel stack of next |
3827ec3d MS |
217 | stg %r15,__THREAD_ksp(%r1) # store kernel stack of prev |
218 | lgr %r1,%r3 | |
219 | aghi %r1,__TASK_thread # thread_struct of next task | |
eda0c6d6 | 220 | lgr %r15,%r5 |
dc7ee00d | 221 | aghi %r15,STACK_INIT # end of kernel stack of next |
eda0c6d6 | 222 | stg %r3,__LC_CURRENT # store task struct of next |
eda0c6d6 | 223 | stg %r15,__LC_KERNEL_STACK # store end of kernel stack |
3827ec3d | 224 | lg %r15,__THREAD_ksp(%r1) # load kernel stack of next |
e22cf8ca | 225 | mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next |
d3a73acb | 226 | lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
e22cf8ca CB |
227 | TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP |
228 | bzr %r14 | |
229 | .insn s,0xb2800000,__LC_LPP # set program parameter | |
1da177e4 LT |
230 | br %r14 |
231 | ||
86ed42f4 | 232 | .L__critical_start: |
d0fc4107 MS |
233 | |
234 | #if IS_ENABLED(CONFIG_KVM) | |
235 | /* | |
236 | * sie64a calling convention: | |
237 | * %r2 pointer to sie control block | |
238 | * %r3 guest register save area | |
239 | */ | |
240 | ENTRY(sie64a) | |
241 | stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers | |
242 | stg %r2,__SF_EMPTY(%r15) # save control block pointer | |
243 | stg %r3,__SF_EMPTY+8(%r15) # save guest register save area | |
e22cf8ca | 244 | xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # reason code = 0 |
83abeffb | 245 | TSTMSK __LC_CPU_FLAGS,_CIF_FPU # load guest fp/vx registers ? |
d0fc4107 | 246 | jno .Lsie_load_guest_gprs |
d0fc4107 MS |
247 | brasl %r14,load_fpu_regs # load guest fp/vx regs |
248 | .Lsie_load_guest_gprs: | |
249 | lmg %r0,%r13,0(%r3) # load guest gprs 0-13 | |
250 | lg %r14,__LC_GMAP # get gmap pointer | |
251 | ltgr %r14,%r14 | |
252 | jz .Lsie_gmap | |
253 | lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce | |
254 | .Lsie_gmap: | |
255 | lg %r14,__SF_EMPTY(%r15) # get control block pointer | |
256 | oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now | |
257 | tm __SIE_PROG20+3(%r14),3 # last exit... | |
258 | jnz .Lsie_skip | |
83abeffb | 259 | TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
d0fc4107 | 260 | jo .Lsie_skip # exit if fp/vx regs changed |
73912dda | 261 | BPON |
c929500d | 262 | .Lsie_entry: |
d0fc4107 | 263 | sie 0(%r14) |
73912dda MS |
264 | .Lsie_exit: |
265 | BPOFF | |
d0fc4107 MS |
266 | .Lsie_skip: |
267 | ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE | |
268 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce | |
269 | .Lsie_done: | |
270 | # some program checks are suppressing. C code (e.g. do_protection_exception) | |
c0e7bb38 CB |
271 | # will rewind the PSW by the ILC, which is often 4 bytes in case of SIE. There |
272 | # are some corner cases (e.g. runtime instrumentation) where ILC is unpredictable. | |
273 | # Other instructions between sie64a and .Lsie_done should not cause program | |
274 | # interrupts. So lets use 3 nops as a landing pad for all possible rewinds. | |
d0fc4107 | 275 | # See also .Lcleanup_sie |
c0e7bb38 CB |
276 | .Lrewind_pad6: |
277 | nopr 7 | |
278 | .Lrewind_pad4: | |
279 | nopr 7 | |
280 | .Lrewind_pad2: | |
281 | nopr 7 | |
d0fc4107 MS |
282 | .globl sie_exit |
283 | sie_exit: | |
284 | lg %r14,__SF_EMPTY+8(%r15) # load guest register save area | |
285 | stmg %r0,%r13,0(%r14) # save guest gprs 0-13 | |
286 | lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers | |
e22cf8ca | 287 | lg %r2,__SF_EMPTY+16(%r15) # return exit reason code |
d0fc4107 MS |
288 | br %r14 |
289 | .Lsie_fault: | |
290 | lghi %r14,-EFAULT | |
e22cf8ca | 291 | stg %r14,__SF_EMPTY+16(%r15) # set exit reason code |
d0fc4107 MS |
292 | j sie_exit |
293 | ||
c0e7bb38 CB |
294 | EX_TABLE(.Lrewind_pad6,.Lsie_fault) |
295 | EX_TABLE(.Lrewind_pad4,.Lsie_fault) | |
296 | EX_TABLE(.Lrewind_pad2,.Lsie_fault) | |
d0fc4107 | 297 | EX_TABLE(sie_exit,.Lsie_fault) |
711f5df7 AV |
298 | EXPORT_SYMBOL(sie64a) |
299 | EXPORT_SYMBOL(sie_exit) | |
d0fc4107 MS |
300 | #endif |
301 | ||
1da177e4 LT |
302 | /* |
303 | * SVC interrupt handler routine. System calls are synchronous events and | |
304 | * are executed with interrupts enabled. | |
305 | */ | |
306 | ||
144d634a | 307 | ENTRY(system_call) |
c185b783 | 308 | stpt __LC_SYNC_ENTER_TIMER |
86ed42f4 | 309 | .Lsysc_stmg: |
c5328901 | 310 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
73912dda | 311 | BPOFF |
d5c352cd | 312 | lg %r12,__LC_CURRENT |
34525e1f | 313 | lghi %r13,__TASK_thread |
d3a73acb | 314 | lghi %r14,_PIF_SYSCALL |
86ed42f4 | 315 | .Lsysc_per: |
c5328901 | 316 | lg %r15,__LC_KERNEL_STACK |
c5328901 | 317 | la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs |
a359bb11 | 318 | .Lsysc_vtime: |
34525e1f | 319 | UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER |
c5328901 MS |
320 | stmg %r0,%r7,__PT_R0(%r11) |
321 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
322 | mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW | |
aa33c8cb | 323 | mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
d3a73acb | 324 | stg %r14,__PT_FLAGS(%r11) |
86ed42f4 | 325 | .Lsysc_do_svc: |
ef280c85 | 326 | # load address of system call table |
ef280c85 | 327 | lg %r10,__THREAD_sysc_table(%r13,%r12) |
aa33c8cb | 328 | llgh %r8,__PT_INT_CODE+2(%r11) |
c5328901 | 329 | slag %r8,%r8,2 # shift and test for svc 0 |
86ed42f4 | 330 | jnz .Lsysc_nr_ok |
1da177e4 | 331 | # svc 0: system call number in %r1 |
c5328901 | 332 | llgfr %r1,%r1 # clear high word in r1 |
86f2552b | 333 | cghi %r1,NR_syscalls |
86ed42f4 | 334 | jnl .Lsysc_nr_ok |
aa33c8cb | 335 | sth %r1,__PT_INT_CODE+2(%r11) |
c5328901 | 336 | slag %r8,%r1,2 |
86ed42f4 | 337 | .Lsysc_nr_ok: |
c5328901 MS |
338 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
339 | stg %r2,__PT_ORIG_GPR2(%r11) | |
340 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
341 | lgf %r9,0(%r8,%r10) # get system call add. | |
83abeffb | 342 | TSTMSK __TI_flags(%r12),_TIF_TRACE |
86ed42f4 | 343 | jnz .Lsysc_tracesys |
c5328901 MS |
344 | basr %r14,%r9 # call sys_xxxx |
345 | stg %r2,__PT_R2(%r11) # store return value | |
1da177e4 | 346 | |
86ed42f4 | 347 | .Lsysc_return: |
6a2df3a8 | 348 | LOCKDEP_SYS_EXIT |
86ed42f4 | 349 | .Lsysc_tif: |
83abeffb | 350 | TSTMSK __PT_FLAGS(%r11),_PIF_WORK |
86ed42f4 | 351 | jnz .Lsysc_work |
83abeffb | 352 | TSTMSK __TI_flags(%r12),_TIF_WORK |
86ed42f4 | 353 | jnz .Lsysc_work # check for work |
83abeffb | 354 | TSTMSK __LC_CPU_FLAGS,_CIF_WORK |
86ed42f4 MS |
355 | jnz .Lsysc_work |
356 | .Lsysc_restore: | |
c5328901 MS |
357 | lg %r14,__LC_VDSO_PER_CPU |
358 | lmg %r0,%r10,__PT_R0(%r11) | |
359 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
73912dda | 360 | BPON |
07a63cbe | 361 | .Lsysc_exit_timer: |
c5328901 MS |
362 | stpt __LC_EXIT_TIMER |
363 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
364 | lmg %r11,%r15,__PT_R11(%r11) | |
365 | lpswe __LC_RETURN_PSW | |
86ed42f4 | 366 | .Lsysc_done: |
411788ea | 367 | |
43d399d2 MS |
368 | # |
369 | # One of the work bits is on. Find out which one. | |
370 | # | |
86ed42f4 | 371 | .Lsysc_work: |
83abeffb | 372 | TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING |
86ed42f4 | 373 | jo .Lsysc_mcck_pending |
83abeffb | 374 | TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED |
86ed42f4 | 375 | jo .Lsysc_reschedule |
23fefe11 MS |
376 | TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL_RESTART |
377 | jo .Lsysc_syscall_restart | |
2a0a5b22 | 378 | #ifdef CONFIG_UPROBES |
83abeffb | 379 | TSTMSK __TI_flags(%r12),_TIF_UPROBE |
86ed42f4 | 380 | jo .Lsysc_uprobe_notify |
2a0a5b22 | 381 | #endif |
916cda1a MS |
382 | TSTMSK __TI_flags(%r12),_TIF_GUARDED_STORAGE |
383 | jo .Lsysc_guarded_storage | |
83abeffb | 384 | TSTMSK __PT_FLAGS(%r11),_PIF_PER_TRAP |
86ed42f4 | 385 | jo .Lsysc_singlestep |
2f09ca60 MB |
386 | #ifdef CONFIG_LIVEPATCH |
387 | TSTMSK __TI_flags(%r12),_TIF_PATCH_PENDING | |
388 | jo .Lsysc_patch_pending # handle live patching just before | |
389 | # signals and possible syscall restart | |
390 | #endif | |
23fefe11 MS |
391 | TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL_RESTART |
392 | jo .Lsysc_syscall_restart | |
83abeffb | 393 | TSTMSK __TI_flags(%r12),_TIF_SIGPENDING |
86ed42f4 | 394 | jo .Lsysc_sigpending |
83abeffb | 395 | TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME |
86ed42f4 | 396 | jo .Lsysc_notify_resume |
83abeffb | 397 | TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
9977e886 | 398 | jo .Lsysc_vxrs |
b5a882fc HC |
399 | TSTMSK __LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY) |
400 | jnz .Lsysc_asce | |
86ed42f4 | 401 | j .Lsysc_return # beware of critical section cleanup |
1da177e4 LT |
402 | |
403 | # | |
404 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf | 405 | # |
86ed42f4 MS |
406 | .Lsysc_reschedule: |
407 | larl %r14,.Lsysc_return | |
c5328901 | 408 | jg schedule |
1da177e4 | 409 | |
77fa2245 | 410 | # |
d3a73acb | 411 | # _CIF_MCCK_PENDING is set, call handler |
77fa2245 | 412 | # |
86ed42f4 MS |
413 | .Lsysc_mcck_pending: |
414 | larl %r14,.Lsysc_return | |
25d83cbf | 415 | jg s390_handle_mcck # TIF bit will be cleared by handler |
77fa2245 | 416 | |
457f2180 | 417 | # |
b5a882fc | 418 | # _CIF_ASCE_PRIMARY and/or CIF_ASCE_SECONDARY set, load user space asce |
457f2180 | 419 | # |
b5a882fc | 420 | .Lsysc_asce: |
606aa4aa | 421 | ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY |
457f2180 | 422 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
b5a882fc HC |
423 | TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_SECONDARY |
424 | jz .Lsysc_return | |
425 | larl %r14,.Lsysc_return | |
426 | jg set_fs_fixup | |
457f2180 | 427 | |
9977e886 HB |
428 | # |
429 | # CIF_FPU is set, restore floating-point controls and floating-point registers. | |
430 | # | |
431 | .Lsysc_vxrs: | |
432 | larl %r14,.Lsysc_return | |
433 | jg load_fpu_regs | |
434 | ||
1da177e4 | 435 | # |
02a029b3 | 436 | # _TIF_SIGPENDING is set, call do_signal |
1da177e4 | 437 | # |
86ed42f4 | 438 | .Lsysc_sigpending: |
c5328901 MS |
439 | lgr %r2,%r11 # pass pointer to pt_regs |
440 | brasl %r14,do_signal | |
83abeffb | 441 | TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL |
86ed42f4 | 442 | jno .Lsysc_return |
57d7f939 MS |
443 | .Lsysc_do_syscall: |
444 | lghi %r13,__TASK_thread | |
c5328901 | 445 | lmg %r2,%r7,__PT_R2(%r11) # load svc arguments |
57d7f939 MS |
446 | lghi %r1,0 # svc 0 returns -ENOSYS |
447 | j .Lsysc_do_svc | |
1da177e4 | 448 | |
753c4dd6 MS |
449 | # |
450 | # _TIF_NOTIFY_RESUME is set, call do_notify_resume | |
451 | # | |
86ed42f4 | 452 | .Lsysc_notify_resume: |
c5328901 | 453 | lgr %r2,%r11 # pass pointer to pt_regs |
86ed42f4 | 454 | larl %r14,.Lsysc_return |
c5328901 | 455 | jg do_notify_resume |
753c4dd6 | 456 | |
2a0a5b22 JW |
457 | # |
458 | # _TIF_UPROBE is set, call uprobe_notify_resume | |
459 | # | |
460 | #ifdef CONFIG_UPROBES | |
86ed42f4 | 461 | .Lsysc_uprobe_notify: |
2a0a5b22 | 462 | lgr %r2,%r11 # pass pointer to pt_regs |
86ed42f4 | 463 | larl %r14,.Lsysc_return |
2a0a5b22 JW |
464 | jg uprobe_notify_resume |
465 | #endif | |
466 | ||
916cda1a MS |
467 | # |
468 | # _TIF_GUARDED_STORAGE is set, call guarded_storage_load | |
469 | # | |
470 | .Lsysc_guarded_storage: | |
471 | lgr %r2,%r11 # pass pointer to pt_regs | |
472 | larl %r14,.Lsysc_return | |
473 | jg gs_load_bc_cb | |
2f09ca60 MB |
474 | # |
475 | # _TIF_PATCH_PENDING is set, call klp_update_patch_state | |
476 | # | |
477 | #ifdef CONFIG_LIVEPATCH | |
478 | .Lsysc_patch_pending: | |
479 | lg %r2,__LC_CURRENT # pass pointer to task struct | |
480 | larl %r14,.Lsysc_return | |
481 | jg klp_update_patch_state | |
482 | #endif | |
916cda1a | 483 | |
1da177e4 | 484 | # |
d3a73acb | 485 | # _PIF_PER_TRAP is set, call do_per_trap |
1da177e4 | 486 | # |
86ed42f4 | 487 | .Lsysc_singlestep: |
d3a73acb | 488 | ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP |
c5328901 | 489 | lgr %r2,%r11 # pass pointer to pt_regs |
86ed42f4 | 490 | larl %r14,.Lsysc_return |
5e9a2692 | 491 | jg do_per_trap |
1da177e4 | 492 | |
23fefe11 MS |
493 | # |
494 | # _PIF_SYSCALL_RESTART is set, repeat the current system call | |
495 | # | |
496 | .Lsysc_syscall_restart: | |
497 | ni __PT_FLAGS+7(%r11),255-_PIF_SYSCALL_RESTART | |
498 | lmg %r1,%r7,__PT_R1(%r11) # load svc arguments | |
499 | lg %r2,__PT_ORIG_GPR2(%r11) | |
500 | j .Lsysc_do_svc | |
501 | ||
1da177e4 | 502 | # |
753c4dd6 MS |
503 | # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
504 | # and after the system call | |
1da177e4 | 505 | # |
86ed42f4 | 506 | .Lsysc_tracesys: |
c5328901 | 507 | lgr %r2,%r11 # pass pointer to pt_regs |
1da177e4 | 508 | la %r3,0 |
aa33c8cb | 509 | llgh %r0,__PT_INT_CODE+2(%r11) |
c5328901 | 510 | stg %r0,__PT_R2(%r11) |
753c4dd6 | 511 | brasl %r14,do_syscall_trace_enter |
1da177e4 | 512 | lghi %r0,NR_syscalls |
753c4dd6 | 513 | clgr %r0,%r2 |
86ed42f4 | 514 | jnh .Lsysc_tracenogo |
c5328901 MS |
515 | sllg %r8,%r2,2 |
516 | lgf %r9,0(%r8,%r10) | |
86ed42f4 | 517 | .Lsysc_tracego: |
c5328901 MS |
518 | lmg %r3,%r7,__PT_R3(%r11) |
519 | stg %r7,STACK_FRAME_OVERHEAD(%r15) | |
520 | lg %r2,__PT_ORIG_GPR2(%r11) | |
521 | basr %r14,%r9 # call sys_xxx | |
522 | stg %r2,__PT_R2(%r11) # store return value | |
86ed42f4 | 523 | .Lsysc_tracenogo: |
83abeffb | 524 | TSTMSK __TI_flags(%r12),_TIF_TRACE |
86ed42f4 | 525 | jz .Lsysc_return |
c5328901 | 526 | lgr %r2,%r11 # pass pointer to pt_regs |
86ed42f4 | 527 | larl %r14,.Lsysc_return |
753c4dd6 | 528 | jg do_syscall_trace_exit |
1da177e4 LT |
529 | |
530 | # | |
531 | # a new process exits the kernel with ret_from_fork | |
532 | # | |
144d634a | 533 | ENTRY(ret_from_fork) |
c5328901 | 534 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
d5c352cd | 535 | lg %r12,__LC_CURRENT |
37fe5d41 AV |
536 | brasl %r14,schedule_tail |
537 | TRACE_IRQS_ON | |
538 | ssm __LC_SVC_NEW_PSW # reenable interrupts | |
30dcb099 | 539 | tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? |
86ed42f4 | 540 | jne .Lsysc_tracenogo |
30dcb099 AV |
541 | # it's a kernel thread |
542 | lmg %r9,%r10,__PT_R9(%r11) # load gprs | |
37fe5d41 AV |
543 | ENTRY(kernel_thread_starter) |
544 | la %r2,0(%r10) | |
545 | basr %r14,%r9 | |
86ed42f4 | 546 | j .Lsysc_tracenogo |
1da177e4 LT |
547 | |
548 | /* | |
549 | * Program check handler routine | |
550 | */ | |
551 | ||
144d634a | 552 | ENTRY(pgm_check_handler) |
c185b783 | 553 | stpt __LC_SYNC_ENTER_TIMER |
73912dda | 554 | BPOFF |
c5328901 MS |
555 | stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
556 | lg %r10,__LC_LAST_BREAK | |
d5c352cd | 557 | lg %r12,__LC_CURRENT |
9977e886 | 558 | larl %r13,cleanup_critical |
c5328901 | 559 | lmg %r8,%r9,__LC_PGM_OLD_PSW |
c5328901 | 560 | tmhh %r8,0x0001 # test problem state bit |
d0fc4107 MS |
561 | jnz 2f # -> fault in user space |
562 | #if IS_ENABLED(CONFIG_KVM) | |
def55c4b | 563 | # cleanup critical section for program checks in sie64a |
d0fc4107 MS |
564 | lgr %r14,%r9 |
565 | slg %r14,BASED(.Lsie_critical_start) | |
566 | clg %r14,BASED(.Lsie_critical_length) | |
567 | jhe 0f | |
def55c4b MS |
568 | lg %r14,__SF_EMPTY(%r15) # get control block pointer |
569 | ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE | |
570 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce | |
571 | larl %r9,sie_exit # skip forward to sie_exit | |
d0fc4107 MS |
572 | #endif |
573 | 0: tmhh %r8,0x4000 # PER bit set in old PSW ? | |
574 | jnz 1f # -> enabled, can't be a double fault | |
c5328901 | 575 | tm __LC_PGM_ILC+3,0x80 # check for per exception |
86ed42f4 | 576 | jnz .Lpgm_svcper # -> single stepped svc |
d0fc4107 | 577 | 1: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC |
dc7ee00d | 578 | aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
d9fcf2a1 | 579 | j 4f |
34525e1f | 580 | 2: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER |
c5328901 | 581 | lg %r15,__LC_KERNEL_STACK |
d5c352cd | 582 | lgr %r14,%r12 |
3827ec3d | 583 | aghi %r14,__TASK_thread # pointer to thread_struct |
d35339a4 MS |
584 | lghi %r13,__LC_PGM_TDB |
585 | tm __LC_PGM_ILC+2,0x02 # check for transaction abort | |
d0fc4107 | 586 | jz 3f |
d35339a4 | 587 | mvc __THREAD_trap_tdb(256,%r14),0(%r13) |
d9fcf2a1 MS |
588 | 3: stg %r10,__THREAD_last_break(%r14) |
589 | 4: la %r11,STACK_FRAME_OVERHEAD(%r15) | |
c5328901 MS |
590 | stmg %r0,%r7,__PT_R0(%r11) |
591 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC | |
592 | stmg %r8,%r9,__PT_PSW(%r11) | |
aa33c8cb MS |
593 | mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
594 | mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE | |
d3a73acb | 595 | xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) |
c5328901 MS |
596 | stg %r10,__PT_ARGS(%r11) |
597 | tm __LC_PGM_ILC+3,0x80 # check for per exception | |
d9fcf2a1 | 598 | jz 5f |
c5328901 | 599 | tmhh %r8,0x0001 # kernel per event ? |
86ed42f4 | 600 | jz .Lpgm_kprobe |
d3a73acb | 601 | oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP |
d35339a4 | 602 | mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS |
21ee7ffd JF |
603 | mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE |
604 | mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID | |
d9fcf2a1 | 605 | 5: REENABLE_IRQS |
c5328901 | 606 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
f5cdac27 | 607 | larl %r1,pgm_check_table |
aa33c8cb MS |
608 | llgh %r10,__PT_INT_CODE+2(%r11) |
609 | nill %r10,0x007f | |
b01a37a7 | 610 | sll %r10,2 |
a359bb11 | 611 | je .Lpgm_return |
b01a37a7 | 612 | lgf %r1,0(%r10,%r1) # load address of handler routine |
c5328901 | 613 | lgr %r2,%r11 # pass pointer to pt_regs |
f5cdac27 | 614 | basr %r14,%r1 # branch to interrupt-handler |
a359bb11 MS |
615 | .Lpgm_return: |
616 | LOCKDEP_SYS_EXIT | |
617 | tm __PT_PSW+1(%r11),0x01 # returning to user ? | |
618 | jno .Lsysc_restore | |
57d7f939 MS |
619 | TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL |
620 | jo .Lsysc_do_syscall | |
a359bb11 | 621 | j .Lsysc_tif |
1da177e4 LT |
622 | |
623 | # | |
c5328901 | 624 | # PER event in supervisor state, must be kprobes |
1da177e4 | 625 | # |
86ed42f4 | 626 | .Lpgm_kprobe: |
c5328901 MS |
627 | REENABLE_IRQS |
628 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) | |
629 | lgr %r2,%r11 # pass pointer to pt_regs | |
630 | brasl %r14,do_per_trap | |
a359bb11 | 631 | j .Lpgm_return |
1da177e4 | 632 | |
4ba069b8 | 633 | # |
c5328901 | 634 | # single stepped system call |
4ba069b8 | 635 | # |
86ed42f4 | 636 | .Lpgm_svcper: |
c5328901 | 637 | mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW |
d24b98e3 | 638 | lghi %r13,__TASK_thread |
86ed42f4 | 639 | larl %r14,.Lsysc_per |
c5328901 | 640 | stg %r14,__LC_RETURN_PSW+8 |
d3a73acb | 641 | lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP |
86ed42f4 | 642 | lpswe __LC_RETURN_PSW # branch to .Lsysc_per and enable irqs |
4ba069b8 | 643 | |
1da177e4 LT |
644 | /* |
645 | * IO interrupt handler routine | |
646 | */ | |
144d634a | 647 | ENTRY(io_int_handler) |
473e66ba | 648 | STCK __LC_INT_CLOCK |
9cfb9b3c | 649 | stpt __LC_ASYNC_ENTER_TIMER |
73912dda | 650 | BPOFF |
c5328901 | 651 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
d5c352cd | 652 | lg %r12,__LC_CURRENT |
9977e886 | 653 | larl %r13,cleanup_critical |
c5328901 | 654 | lmg %r8,%r9,__LC_IO_OLD_PSW |
2acb94f4 | 655 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER |
c5328901 MS |
656 | stmg %r0,%r7,__PT_R0(%r11) |
657 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
658 | stmg %r8,%r9,__PT_PSW(%r11) | |
48f6b00c | 659 | mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID |
d3a73acb | 660 | xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) |
db7e007f HC |
661 | TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ |
662 | jo .Lio_restore | |
1f194a4c | 663 | TRACE_IRQS_OFF |
c5328901 | 664 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
86ed42f4 | 665 | .Lio_loop: |
c5328901 | 666 | lgr %r2,%r11 # pass pointer to pt_regs |
1f44a225 MS |
667 | lghi %r3,IO_INTERRUPT |
668 | tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ? | |
86ed42f4 | 669 | jz .Lio_call |
1f44a225 | 670 | lghi %r3,THIN_INTERRUPT |
86ed42f4 | 671 | .Lio_call: |
c5328901 | 672 | brasl %r14,do_IRQ |
83abeffb | 673 | TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPAR |
86ed42f4 | 674 | jz .Lio_return |
48f6b00c | 675 | tpi 0 |
86ed42f4 | 676 | jz .Lio_return |
48f6b00c | 677 | mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID |
86ed42f4 MS |
678 | j .Lio_loop |
679 | .Lio_return: | |
6a2df3a8 MS |
680 | LOCKDEP_SYS_EXIT |
681 | TRACE_IRQS_ON | |
86ed42f4 | 682 | .Lio_tif: |
83abeffb | 683 | TSTMSK __TI_flags(%r12),_TIF_WORK |
86ed42f4 | 684 | jnz .Lio_work # there is work to do (signals etc.) |
83abeffb | 685 | TSTMSK __LC_CPU_FLAGS,_CIF_WORK |
86ed42f4 MS |
686 | jnz .Lio_work |
687 | .Lio_restore: | |
c5328901 MS |
688 | lg %r14,__LC_VDSO_PER_CPU |
689 | lmg %r0,%r10,__PT_R0(%r11) | |
690 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) | |
73912dda MS |
691 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
692 | jno .Lio_exit_kernel | |
693 | BPON | |
07a63cbe | 694 | .Lio_exit_timer: |
c5328901 MS |
695 | stpt __LC_EXIT_TIMER |
696 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER | |
73912dda | 697 | .Lio_exit_kernel: |
c5328901 MS |
698 | lmg %r11,%r15,__PT_R11(%r11) |
699 | lpswe __LC_RETURN_PSW | |
86ed42f4 | 700 | .Lio_done: |
1da177e4 | 701 | |
2688905e | 702 | # |
43d399d2 | 703 | # There is work todo, find out in which context we have been interrupted: |
d3a73acb | 704 | # 1) if we return to user space we can do all _TIF_WORK work |
43d399d2 MS |
705 | # 2) if we return to kernel code and kvm is enabled check if we need to |
706 | # modify the psw to leave SIE | |
707 | # 3) if we return to kernel code and preemptive scheduling is enabled check | |
708 | # the preemption counter and if it is zero call preempt_schedule_irq | |
709 | # Before any work can be done, a switch to the kernel stack is required. | |
2688905e | 710 | # |
86ed42f4 | 711 | .Lio_work: |
c5328901 | 712 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
86ed42f4 | 713 | jo .Lio_work_user # yes -> do resched & signal |
43d399d2 | 714 | #ifdef CONFIG_PREEMPT |
2688905e | 715 | # check for preemptive scheduling |
c360192b | 716 | icm %r0,15,__LC_PREEMPT_COUNT |
86ed42f4 | 717 | jnz .Lio_restore # preemption is disabled |
83abeffb | 718 | TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED |
86ed42f4 | 719 | jno .Lio_restore |
1da177e4 | 720 | # switch to kernel stack |
c5328901 MS |
721 | lg %r1,__PT_R15(%r11) |
722 | aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) | |
723 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) | |
724 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
725 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 726 | lgr %r15,%r1 |
86ed42f4 | 727 | # TRACE_IRQS_ON already done at .Lio_return, call |
6a2df3a8 MS |
728 | # TRACE_IRQS_OFF to keep things symmetrical |
729 | TRACE_IRQS_OFF | |
730 | brasl %r14,preempt_schedule_irq | |
86ed42f4 | 731 | j .Lio_return |
6a2df3a8 | 732 | #else |
86ed42f4 | 733 | j .Lio_restore |
6a2df3a8 | 734 | #endif |
1da177e4 | 735 | |
43d399d2 MS |
736 | # |
737 | # Need to do work before returning to userspace, switch to kernel stack | |
738 | # | |
86ed42f4 | 739 | .Lio_work_user: |
1da177e4 | 740 | lg %r1,__LC_KERNEL_STACK |
c5328901 MS |
741 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
742 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
743 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
1da177e4 | 744 | lgr %r15,%r1 |
43d399d2 | 745 | |
1da177e4 LT |
746 | # |
747 | # One of the work bits is on. Find out which one. | |
1da177e4 | 748 | # |
86ed42f4 | 749 | .Lio_work_tif: |
83abeffb | 750 | TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING |
86ed42f4 | 751 | jo .Lio_mcck_pending |
83abeffb | 752 | TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED |
86ed42f4 | 753 | jo .Lio_reschedule |
2f09ca60 MB |
754 | #ifdef CONFIG_LIVEPATCH |
755 | TSTMSK __TI_flags(%r12),_TIF_PATCH_PENDING | |
756 | jo .Lio_patch_pending | |
757 | #endif | |
83abeffb | 758 | TSTMSK __TI_flags(%r12),_TIF_SIGPENDING |
86ed42f4 | 759 | jo .Lio_sigpending |
83abeffb | 760 | TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME |
86ed42f4 | 761 | jo .Lio_notify_resume |
916cda1a MS |
762 | TSTMSK __TI_flags(%r12),_TIF_GUARDED_STORAGE |
763 | jo .Lio_guarded_storage | |
83abeffb | 764 | TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
9977e886 | 765 | jo .Lio_vxrs |
b5a882fc HC |
766 | TSTMSK __LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY) |
767 | jnz .Lio_asce | |
86ed42f4 | 768 | j .Lio_return # beware of critical section cleanup |
0eaeafa1 | 769 | |
77fa2245 | 770 | # |
d3a73acb | 771 | # _CIF_MCCK_PENDING is set, call handler |
77fa2245 | 772 | # |
86ed42f4 MS |
773 | .Lio_mcck_pending: |
774 | # TRACE_IRQS_ON already done at .Lio_return | |
b771aeac | 775 | brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler |
6a2df3a8 | 776 | TRACE_IRQS_OFF |
86ed42f4 | 777 | j .Lio_return |
77fa2245 | 778 | |
457f2180 | 779 | # |
b5a882fc | 780 | # _CIF_ASCE_PRIMARY and/or CIF_ASCE_SECONDARY set, load user space asce |
457f2180 | 781 | # |
b5a882fc | 782 | .Lio_asce: |
606aa4aa | 783 | ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY |
457f2180 | 784 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
b5a882fc HC |
785 | TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_SECONDARY |
786 | jz .Lio_return | |
787 | larl %r14,.Lio_return | |
788 | jg set_fs_fixup | |
457f2180 | 789 | |
9977e886 HB |
790 | # |
791 | # CIF_FPU is set, restore floating-point controls and floating-point registers. | |
792 | # | |
793 | .Lio_vxrs: | |
794 | larl %r14,.Lio_return | |
795 | jg load_fpu_regs | |
796 | ||
916cda1a MS |
797 | # |
798 | # _TIF_GUARDED_STORAGE is set, call guarded_storage_load | |
799 | # | |
800 | .Lio_guarded_storage: | |
801 | # TRACE_IRQS_ON already done at .Lio_return | |
802 | ssm __LC_SVC_NEW_PSW # reenable interrupts | |
803 | lgr %r2,%r11 # pass pointer to pt_regs | |
804 | brasl %r14,gs_load_bc_cb | |
805 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
806 | TRACE_IRQS_OFF | |
807 | j .Lio_return | |
808 | ||
1da177e4 LT |
809 | # |
810 | # _TIF_NEED_RESCHED is set, call schedule | |
25d83cbf | 811 | # |
86ed42f4 MS |
812 | .Lio_reschedule: |
813 | # TRACE_IRQS_ON already done at .Lio_return | |
c5328901 | 814 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
25d83cbf | 815 | brasl %r14,schedule # call scheduler |
c5328901 | 816 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
411788ea | 817 | TRACE_IRQS_OFF |
86ed42f4 | 818 | j .Lio_return |
1da177e4 | 819 | |
2f09ca60 MB |
820 | # |
821 | # _TIF_PATCH_PENDING is set, call klp_update_patch_state | |
822 | # | |
823 | #ifdef CONFIG_LIVEPATCH | |
824 | .Lio_patch_pending: | |
825 | lg %r2,__LC_CURRENT # pass pointer to task struct | |
826 | larl %r14,.Lio_return | |
827 | jg klp_update_patch_state | |
828 | #endif | |
829 | ||
1da177e4 | 830 | # |
02a029b3 | 831 | # _TIF_SIGPENDING or is set, call do_signal |
1da177e4 | 832 | # |
86ed42f4 MS |
833 | .Lio_sigpending: |
834 | # TRACE_IRQS_ON already done at .Lio_return | |
c5328901 MS |
835 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
836 | lgr %r2,%r11 # pass pointer to pt_regs | |
837 | brasl %r14,do_signal | |
838 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
411788ea | 839 | TRACE_IRQS_OFF |
86ed42f4 | 840 | j .Lio_return |
1da177e4 | 841 | |
753c4dd6 MS |
842 | # |
843 | # _TIF_NOTIFY_RESUME or is set, call do_notify_resume | |
844 | # | |
86ed42f4 MS |
845 | .Lio_notify_resume: |
846 | # TRACE_IRQS_ON already done at .Lio_return | |
c5328901 MS |
847 | ssm __LC_SVC_NEW_PSW # reenable interrupts |
848 | lgr %r2,%r11 # pass pointer to pt_regs | |
849 | brasl %r14,do_notify_resume | |
850 | ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts | |
753c4dd6 | 851 | TRACE_IRQS_OFF |
86ed42f4 | 852 | j .Lio_return |
753c4dd6 | 853 | |
1da177e4 LT |
854 | /* |
855 | * External interrupt handler routine | |
856 | */ | |
144d634a | 857 | ENTRY(ext_int_handler) |
473e66ba | 858 | STCK __LC_INT_CLOCK |
9cfb9b3c | 859 | stpt __LC_ASYNC_ENTER_TIMER |
73912dda | 860 | BPOFF |
c5328901 | 861 | stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
d5c352cd | 862 | lg %r12,__LC_CURRENT |
9977e886 | 863 | larl %r13,cleanup_critical |
c5328901 | 864 | lmg %r8,%r9,__LC_EXT_OLD_PSW |
2acb94f4 | 865 | SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER |
c5328901 MS |
866 | stmg %r0,%r7,__PT_R0(%r11) |
867 | mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC | |
868 | stmg %r8,%r9,__PT_PSW(%r11) | |
48f6b00c MS |
869 | lghi %r1,__LC_EXT_PARAMS2 |
870 | mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR | |
871 | mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS | |
872 | mvc __PT_INT_PARM_LONG(8,%r11),0(%r1) | |
d3a73acb | 873 | xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) |
db7e007f HC |
874 | TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ |
875 | jo .Lio_restore | |
1f194a4c | 876 | TRACE_IRQS_OFF |
0de9db37 | 877 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
c5328901 | 878 | lgr %r2,%r11 # pass pointer to pt_regs |
1f44a225 MS |
879 | lghi %r3,EXT_INTERRUPT |
880 | brasl %r14,do_IRQ | |
86ed42f4 | 881 | j .Lio_return |
1da177e4 | 882 | |
4c1051e3 | 883 | /* |
86ed42f4 | 884 | * Load idle PSW. The second "half" of this function is in .Lcleanup_idle. |
4c1051e3 MS |
885 | */ |
886 | ENTRY(psw_idle) | |
27f6b416 | 887 | stg %r3,__SF_EMPTY(%r15) |
86ed42f4 | 888 | larl %r1,.Lpsw_idle_lpsw+4 |
4c1051e3 | 889 | stg %r1,__SF_EMPTY+8(%r15) |
72d38b19 MS |
890 | #ifdef CONFIG_SMP |
891 | larl %r1,smp_cpu_mtid | |
892 | llgf %r1,0(%r1) | |
893 | ltgr %r1,%r1 | |
894 | jz .Lpsw_idle_stcctm | |
895 | .insn rsy,0xeb0000000017,%r1,5,__SF_EMPTY+16(%r15) | |
896 | .Lpsw_idle_stcctm: | |
897 | #endif | |
419123f9 | 898 | oi __LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT |
73912dda | 899 | BPON |
27f6b416 MS |
900 | STCK __CLOCK_IDLE_ENTER(%r2) |
901 | stpt __TIMER_IDLE_ENTER(%r2) | |
86ed42f4 | 902 | .Lpsw_idle_lpsw: |
4c1051e3 MS |
903 | lpswe __SF_EMPTY(%r15) |
904 | br %r14 | |
86ed42f4 | 905 | .Lpsw_idle_end: |
4c1051e3 | 906 | |
b5510d9b HB |
907 | /* |
908 | * Store floating-point controls and floating-point or vector register | |
909 | * depending whether the vector facility is available. A critical section | |
910 | * cleanup assures that the registers are stored even if interrupted for | |
911 | * some other work. The CIF_FPU flag is set to trigger a lazy restore | |
912 | * of the register contents at return from io or a system call. | |
9977e886 HB |
913 | */ |
914 | ENTRY(save_fpu_regs) | |
d0164ee2 HB |
915 | lg %r2,__LC_CURRENT |
916 | aghi %r2,__TASK_thread | |
83abeffb | 917 | TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
9977e886 | 918 | bor %r14 |
d0164ee2 | 919 | stfpc __THREAD_FPU_fpc(%r2) |
d0164ee2 | 920 | lg %r3,__THREAD_FPU_regs(%r2) |
83abeffb | 921 | TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX |
9977e886 | 922 | jz .Lsave_fpu_regs_fp # no -> store FP regs |
9977e886 | 923 | VSTM %v0,%v15,0,%r3 # vstm 0,15,0(3) |
9977e886 HB |
924 | VSTM %v16,%v31,256,%r3 # vstm 16,31,256(3) |
925 | j .Lsave_fpu_regs_done # -> set CIF_FPU flag | |
926 | .Lsave_fpu_regs_fp: | |
927 | std 0,0(%r3) | |
928 | std 1,8(%r3) | |
929 | std 2,16(%r3) | |
930 | std 3,24(%r3) | |
931 | std 4,32(%r3) | |
932 | std 5,40(%r3) | |
933 | std 6,48(%r3) | |
934 | std 7,56(%r3) | |
935 | std 8,64(%r3) | |
936 | std 9,72(%r3) | |
937 | std 10,80(%r3) | |
938 | std 11,88(%r3) | |
939 | std 12,96(%r3) | |
940 | std 13,104(%r3) | |
941 | std 14,112(%r3) | |
942 | std 15,120(%r3) | |
943 | .Lsave_fpu_regs_done: | |
944 | oi __LC_CPU_FLAGS+7,_CIF_FPU | |
945 | br %r14 | |
946 | .Lsave_fpu_regs_end: | |
711f5df7 | 947 | EXPORT_SYMBOL(save_fpu_regs) |
9977e886 | 948 | |
b5510d9b HB |
949 | /* |
950 | * Load floating-point controls and floating-point or vector registers. | |
951 | * A critical section cleanup assures that the register contents are | |
952 | * loaded even if interrupted for some other work. | |
9977e886 HB |
953 | * |
954 | * There are special calling conventions to fit into sysc and io return work: | |
9977e886 HB |
955 | * %r15: <kernel stack> |
956 | * The function requires: | |
b5510d9b | 957 | * %r4 |
9977e886 HB |
958 | */ |
959 | load_fpu_regs: | |
d0164ee2 HB |
960 | lg %r4,__LC_CURRENT |
961 | aghi %r4,__TASK_thread | |
83abeffb | 962 | TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
9977e886 | 963 | bnor %r14 |
d0164ee2 | 964 | lfpc __THREAD_FPU_fpc(%r4) |
83abeffb | 965 | TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX |
d0164ee2 | 966 | lg %r4,__THREAD_FPU_regs(%r4) # %r4 <- reg save area |
b5510d9b | 967 | jz .Lload_fpu_regs_fp # -> no VX, load FP regs |
9977e886 | 968 | VLM %v0,%v15,0,%r4 |
9977e886 HB |
969 | VLM %v16,%v31,256,%r4 |
970 | j .Lload_fpu_regs_done | |
9977e886 HB |
971 | .Lload_fpu_regs_fp: |
972 | ld 0,0(%r4) | |
973 | ld 1,8(%r4) | |
974 | ld 2,16(%r4) | |
975 | ld 3,24(%r4) | |
976 | ld 4,32(%r4) | |
977 | ld 5,40(%r4) | |
978 | ld 6,48(%r4) | |
979 | ld 7,56(%r4) | |
980 | ld 8,64(%r4) | |
981 | ld 9,72(%r4) | |
982 | ld 10,80(%r4) | |
983 | ld 11,88(%r4) | |
984 | ld 12,96(%r4) | |
985 | ld 13,104(%r4) | |
986 | ld 14,112(%r4) | |
987 | ld 15,120(%r4) | |
988 | .Lload_fpu_regs_done: | |
989 | ni __LC_CPU_FLAGS+7,255-_CIF_FPU | |
990 | br %r14 | |
991 | .Lload_fpu_regs_end: | |
992 | ||
86ed42f4 | 993 | .L__critical_end: |
ae6aa2ea | 994 | |
1da177e4 LT |
995 | /* |
996 | * Machine check handler routines | |
997 | */ | |
144d634a | 998 | ENTRY(mcck_int_handler) |
473e66ba | 999 | STCK __LC_MCCK_CLOCK |
73912dda | 1000 | BPOFF |
77fa2245 HC |
1001 | la %r1,4095 # revalidate r1 |
1002 | spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer | |
25d83cbf | 1003 | lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs |
d5c352cd | 1004 | lg %r12,__LC_CURRENT |
9977e886 | 1005 | larl %r13,cleanup_critical |
c5328901 | 1006 | lmg %r8,%r9,__LC_MCK_OLD_PSW |
83abeffb | 1007 | TSTMSK __LC_MCCK_CODE,MCCK_CODE_SYSTEM_DAMAGE |
86ed42f4 | 1008 | jo .Lmcck_panic # yes -> rest of mcck code invalid |
c5328901 MS |
1009 | lghi %r14,__LC_CPU_TIMER_SAVE_AREA |
1010 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) | |
83abeffb | 1011 | TSTMSK __LC_MCCK_CODE,MCCK_CODE_CPU_TIMER_VALID |
c5328901 | 1012 | jo 3f |
63b12246 MS |
1013 | la %r14,__LC_SYNC_ENTER_TIMER |
1014 | clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER | |
1015 | jl 0f | |
1016 | la %r14,__LC_ASYNC_ENTER_TIMER | |
1017 | 0: clc 0(8,%r14),__LC_EXIT_TIMER | |
c5328901 | 1018 | jl 1f |
63b12246 | 1019 | la %r14,__LC_EXIT_TIMER |
c5328901 MS |
1020 | 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
1021 | jl 2f | |
63b12246 | 1022 | la %r14,__LC_LAST_UPDATE_TIMER |
c5328901 | 1023 | 2: spt 0(%r14) |
6377981f | 1024 | mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
83abeffb | 1025 | 3: TSTMSK __LC_MCCK_CODE,(MCCK_CODE_PSW_MWP_VALID|MCCK_CODE_PSW_IA_VALID) |
86ed42f4 | 1026 | jno .Lmcck_panic # no -> skip cleanup critical |
2acb94f4 | 1027 | SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER |
86ed42f4 | 1028 | .Lmcck_skip: |
6551fbdf MS |
1029 | lghi %r14,__LC_GPREGS_SAVE_AREA+64 |
1030 | stmg %r0,%r7,__PT_R0(%r11) | |
1031 | mvc __PT_R8(64,%r11),0(%r14) | |
c5328901 | 1032 | stmg %r8,%r9,__PT_PSW(%r11) |
d3a73acb | 1033 | xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) |
c5328901 MS |
1034 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
1035 | lgr %r2,%r11 # pass pointer to pt_regs | |
77fa2245 | 1036 | brasl %r14,s390_do_machine_check |
c5328901 | 1037 | tm __PT_PSW+1(%r11),0x01 # returning to user ? |
86ed42f4 | 1038 | jno .Lmcck_return |
77fa2245 | 1039 | lg %r1,__LC_KERNEL_STACK # switch to kernel stack |
c5328901 MS |
1040 | mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
1041 | xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) | |
1042 | la %r11,STACK_FRAME_OVERHEAD(%r1) | |
77fa2245 | 1043 | lgr %r15,%r1 |
c5328901 | 1044 | ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
83abeffb | 1045 | TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING |
86ed42f4 | 1046 | jno .Lmcck_return |
1f194a4c | 1047 | TRACE_IRQS_OFF |
77fa2245 | 1048 | brasl %r14,s390_handle_mcck |
1f194a4c | 1049 | TRACE_IRQS_ON |
86ed42f4 | 1050 | .Lmcck_return: |
c5328901 MS |
1051 | lg %r14,__LC_VDSO_PER_CPU |
1052 | lmg %r0,%r10,__PT_R0(%r11) | |
1053 | mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW | |
63b12246 MS |
1054 | tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
1055 | jno 0f | |
73912dda | 1056 | BPON |
63b12246 | 1057 | stpt __LC_EXIT_TIMER |
c5328901 MS |
1058 | mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
1059 | 0: lmg %r11,%r15,__PT_R11(%r11) | |
1060 | lpswe __LC_RETURN_MCCK_PSW | |
1061 | ||
86ed42f4 | 1062 | .Lmcck_panic: |
c5328901 | 1063 | lg %r15,__LC_PANIC_STACK |
ce4dda3f | 1064 | la %r11,STACK_FRAME_OVERHEAD(%r15) |
86ed42f4 | 1065 | j .Lmcck_skip |
1da177e4 | 1066 | |
7dd6b334 MH |
1067 | # |
1068 | # PSW restart interrupt handler | |
1069 | # | |
8b646bd7 | 1070 | ENTRY(restart_int_handler) |
e22cf8ca CB |
1071 | TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP |
1072 | jz 0f | |
1073 | .insn s,0xb2800000,__LC_LPP | |
1074 | 0: stg %r15,__LC_SAVE_AREA_RESTART | |
8b646bd7 | 1075 | lg %r15,__LC_RESTART_STACK |
c5328901 | 1076 | aghi %r15,-__PT_SIZE # create pt_regs on stack |
8b646bd7 | 1077 | xc 0(__PT_SIZE,%r15),0(%r15) |
c5328901 MS |
1078 | stmg %r0,%r14,__PT_R0(%r15) |
1079 | mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART | |
1080 | mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw | |
8b646bd7 MS |
1081 | aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
1082 | xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) | |
fbe76568 HC |
1083 | lg %r1,__LC_RESTART_FN # load fn, parm & source cpu |
1084 | lg %r2,__LC_RESTART_DATA | |
1085 | lg %r3,__LC_RESTART_SOURCE | |
8b646bd7 MS |
1086 | ltgr %r3,%r3 # test source cpu address |
1087 | jm 1f # negative -> skip source stop | |
eb546195 | 1088 | 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
8b646bd7 MS |
1089 | brc 10,0b # wait for status stored |
1090 | 1: basr %r14,%r1 # call function | |
1091 | stap __SF_EMPTY(%r15) # store cpu address | |
1092 | llgh %r3,__SF_EMPTY(%r15) | |
eb546195 | 1093 | 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
8b646bd7 MS |
1094 | brc 2,2b |
1095 | 3: j 3b | |
7dd6b334 | 1096 | |
860dba45 MS |
1097 | .section .kprobes.text, "ax" |
1098 | ||
1da177e4 LT |
1099 | #ifdef CONFIG_CHECK_STACK |
1100 | /* | |
1101 | * The synchronous or the asynchronous stack overflowed. We are dead. | |
1102 | * No need to properly save the registers, we are going to panic anyway. | |
1103 | * Setup a pt_regs so that show_trace can provide a good call trace. | |
1104 | */ | |
1105 | stack_overflow: | |
dc7ee00d MS |
1106 | lg %r15,__LC_PANIC_STACK # change to panic stack |
1107 | la %r11,STACK_FRAME_OVERHEAD(%r15) | |
c5328901 MS |
1108 | stmg %r0,%r7,__PT_R0(%r11) |
1109 | stmg %r8,%r9,__PT_PSW(%r11) | |
1110 | mvc __PT_R8(64,%r11),0(%r14) | |
1111 | stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 | |
c5328901 MS |
1112 | xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
1113 | lgr %r2,%r11 # pass pointer to pt_regs | |
1da177e4 LT |
1114 | jg kernel_stack_overflow |
1115 | #endif | |
1116 | ||
1da177e4 | 1117 | cleanup_critical: |
d0fc4107 MS |
1118 | #if IS_ENABLED(CONFIG_KVM) |
1119 | clg %r9,BASED(.Lcleanup_table_sie) # .Lsie_gmap | |
1120 | jl 0f | |
1121 | clg %r9,BASED(.Lcleanup_table_sie+8)# .Lsie_done | |
1122 | jl .Lcleanup_sie | |
1123 | #endif | |
86ed42f4 | 1124 | clg %r9,BASED(.Lcleanup_table) # system_call |
1da177e4 | 1125 | jl 0f |
86ed42f4 MS |
1126 | clg %r9,BASED(.Lcleanup_table+8) # .Lsysc_do_svc |
1127 | jl .Lcleanup_system_call | |
1128 | clg %r9,BASED(.Lcleanup_table+16) # .Lsysc_tif | |
1da177e4 | 1129 | jl 0f |
86ed42f4 MS |
1130 | clg %r9,BASED(.Lcleanup_table+24) # .Lsysc_restore |
1131 | jl .Lcleanup_sysc_tif | |
1132 | clg %r9,BASED(.Lcleanup_table+32) # .Lsysc_done | |
1133 | jl .Lcleanup_sysc_restore | |
1134 | clg %r9,BASED(.Lcleanup_table+40) # .Lio_tif | |
63b12246 | 1135 | jl 0f |
86ed42f4 MS |
1136 | clg %r9,BASED(.Lcleanup_table+48) # .Lio_restore |
1137 | jl .Lcleanup_io_tif | |
1138 | clg %r9,BASED(.Lcleanup_table+56) # .Lio_done | |
1139 | jl .Lcleanup_io_restore | |
1140 | clg %r9,BASED(.Lcleanup_table+64) # psw_idle | |
4c1051e3 | 1141 | jl 0f |
86ed42f4 MS |
1142 | clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end |
1143 | jl .Lcleanup_idle | |
9977e886 HB |
1144 | clg %r9,BASED(.Lcleanup_table+80) # save_fpu_regs |
1145 | jl 0f | |
1146 | clg %r9,BASED(.Lcleanup_table+88) # .Lsave_fpu_regs_end | |
1147 | jl .Lcleanup_save_fpu_regs | |
1148 | clg %r9,BASED(.Lcleanup_table+96) # load_fpu_regs | |
1149 | jl 0f | |
1150 | clg %r9,BASED(.Lcleanup_table+104) # .Lload_fpu_regs_end | |
1151 | jl .Lcleanup_load_fpu_regs | |
c5328901 MS |
1152 | 0: br %r14 |
1153 | ||
d0fc4107 MS |
1154 | .align 8 |
1155 | .Lcleanup_table: | |
1156 | .quad system_call | |
1157 | .quad .Lsysc_do_svc | |
1158 | .quad .Lsysc_tif | |
1159 | .quad .Lsysc_restore | |
1160 | .quad .Lsysc_done | |
1161 | .quad .Lio_tif | |
1162 | .quad .Lio_restore | |
1163 | .quad .Lio_done | |
1164 | .quad psw_idle | |
1165 | .quad .Lpsw_idle_end | |
1166 | .quad save_fpu_regs | |
1167 | .quad .Lsave_fpu_regs_end | |
1168 | .quad load_fpu_regs | |
1169 | .quad .Lload_fpu_regs_end | |
d0fc4107 MS |
1170 | |
1171 | #if IS_ENABLED(CONFIG_KVM) | |
1172 | .Lcleanup_table_sie: | |
1173 | .quad .Lsie_gmap | |
1174 | .quad .Lsie_done | |
1175 | ||
1176 | .Lcleanup_sie: | |
c929500d QH |
1177 | cghi %r11,__LC_SAVE_AREA_ASYNC #Is this in normal interrupt? |
1178 | je 1f | |
1179 | slg %r9,BASED(.Lsie_crit_mcck_start) | |
1180 | clg %r9,BASED(.Lsie_crit_mcck_length) | |
1181 | jh 1f | |
1182 | oi __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST | |
1183 | 1: lg %r9,__SF_EMPTY(%r15) # get control block pointer | |
e22cf8ca | 1184 | ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE |
d0fc4107 MS |
1185 | lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
1186 | larl %r9,sie_exit # skip forward to sie_exit | |
1187 | br %r14 | |
1188 | #endif | |
1da177e4 | 1189 | |
86ed42f4 | 1190 | .Lcleanup_system_call: |
c5328901 | 1191 | # check if stpt has been executed |
86ed42f4 | 1192 | clg %r9,BASED(.Lcleanup_system_call_insn) |
1da177e4 LT |
1193 | jh 0f |
1194 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
c5328901 | 1195 | cghi %r11,__LC_SAVE_AREA_ASYNC |
6377981f | 1196 | je 0f |
c5328901 MS |
1197 | mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
1198 | 0: # check if stmg has been executed | |
86ed42f4 | 1199 | clg %r9,BASED(.Lcleanup_system_call_insn+8) |
1da177e4 | 1200 | jh 0f |
c5328901 MS |
1201 | mvc __LC_SAVE_AREA_SYNC(64),0(%r11) |
1202 | 0: # check if base register setup + TIF bit load has been done | |
86ed42f4 | 1203 | clg %r9,BASED(.Lcleanup_system_call_insn+16) |
c5328901 | 1204 | jhe 0f |
34525e1f MS |
1205 | # set up saved register r12 task struct pointer |
1206 | stg %r12,32(%r11) | |
1207 | # set up saved register r13 __TASK_thread offset | |
1208 | mvc 40(8,%r11),BASED(.Lcleanup_system_call_const) | |
c5328901 | 1209 | 0: # check if the user time update has been done |
86ed42f4 | 1210 | clg %r9,BASED(.Lcleanup_system_call_insn+24) |
c5328901 MS |
1211 | jh 0f |
1212 | lg %r15,__LC_EXIT_TIMER | |
1213 | slg %r15,__LC_SYNC_ENTER_TIMER | |
1214 | alg %r15,__LC_USER_TIMER | |
1215 | stg %r15,__LC_USER_TIMER | |
1216 | 0: # check if the system time update has been done | |
86ed42f4 | 1217 | clg %r9,BASED(.Lcleanup_system_call_insn+32) |
c5328901 MS |
1218 | jh 0f |
1219 | lg %r15,__LC_LAST_UPDATE_TIMER | |
1220 | slg %r15,__LC_EXIT_TIMER | |
1221 | alg %r15,__LC_SYSTEM_TIMER | |
1222 | stg %r15,__LC_SYSTEM_TIMER | |
1223 | 0: # update accounting time stamp | |
1da177e4 | 1224 | mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
34525e1f | 1225 | # set up saved register r11 |
c5328901 | 1226 | lg %r15,__LC_KERNEL_STACK |
dc7ee00d MS |
1227 | la %r9,STACK_FRAME_OVERHEAD(%r15) |
1228 | stg %r9,24(%r11) # r11 pt_regs pointer | |
c5328901 | 1229 | # fill pt_regs |
dc7ee00d MS |
1230 | mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC |
1231 | stmg %r0,%r7,__PT_R0(%r9) | |
1232 | mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW | |
1233 | mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC | |
d3a73acb MS |
1234 | xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9) |
1235 | mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL | |
c5328901 | 1236 | # setup saved register r15 |
c5328901 MS |
1237 | stg %r15,56(%r11) # r15 stack pointer |
1238 | # set new psw address and exit | |
86ed42f4 | 1239 | larl %r9,.Lsysc_do_svc |
1da177e4 | 1240 | br %r14 |
86ed42f4 | 1241 | .Lcleanup_system_call_insn: |
25d83cbf | 1242 | .quad system_call |
86ed42f4 MS |
1243 | .quad .Lsysc_stmg |
1244 | .quad .Lsysc_per | |
a359bb11 | 1245 | .quad .Lsysc_vtime+36 |
86ed42f4 | 1246 | .quad .Lsysc_vtime+42 |
34525e1f MS |
1247 | .Lcleanup_system_call_const: |
1248 | .quad __TASK_thread | |
1da177e4 | 1249 | |
86ed42f4 MS |
1250 | .Lcleanup_sysc_tif: |
1251 | larl %r9,.Lsysc_tif | |
1da177e4 LT |
1252 | br %r14 |
1253 | ||
86ed42f4 | 1254 | .Lcleanup_sysc_restore: |
07a63cbe | 1255 | # check if stpt has been executed |
86ed42f4 | 1256 | clg %r9,BASED(.Lcleanup_sysc_restore_insn) |
07a63cbe MS |
1257 | jh 0f |
1258 | mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER | |
1259 | cghi %r11,__LC_SAVE_AREA_ASYNC | |
6377981f | 1260 | je 0f |
07a63cbe MS |
1261 | mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER |
1262 | 0: clg %r9,BASED(.Lcleanup_sysc_restore_insn+8) | |
1263 | je 1f | |
c5328901 MS |
1264 | lg %r9,24(%r11) # get saved pointer to pt_regs |
1265 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
1266 | mvc 0(64,%r11),__PT_R8(%r9) | |
1267 | lmg %r0,%r7,__PT_R0(%r9) | |
07a63cbe | 1268 | 1: lmg %r8,%r9,__LC_RETURN_PSW |
1da177e4 | 1269 | br %r14 |
86ed42f4 | 1270 | .Lcleanup_sysc_restore_insn: |
07a63cbe | 1271 | .quad .Lsysc_exit_timer |
86ed42f4 | 1272 | .quad .Lsysc_done - 4 |
1da177e4 | 1273 | |
86ed42f4 MS |
1274 | .Lcleanup_io_tif: |
1275 | larl %r9,.Lio_tif | |
176b1803 MS |
1276 | br %r14 |
1277 | ||
86ed42f4 | 1278 | .Lcleanup_io_restore: |
07a63cbe | 1279 | # check if stpt has been executed |
86ed42f4 | 1280 | clg %r9,BASED(.Lcleanup_io_restore_insn) |
07a63cbe MS |
1281 | jh 0f |
1282 | mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER | |
1283 | 0: clg %r9,BASED(.Lcleanup_io_restore_insn+8) | |
1284 | je 1f | |
c5328901 MS |
1285 | lg %r9,24(%r11) # get saved r11 pointer to pt_regs |
1286 | mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) | |
c5328901 MS |
1287 | mvc 0(64,%r11),__PT_R8(%r9) |
1288 | lmg %r0,%r7,__PT_R0(%r9) | |
07a63cbe | 1289 | 1: lmg %r8,%r9,__LC_RETURN_PSW |
ae6aa2ea | 1290 | br %r14 |
86ed42f4 | 1291 | .Lcleanup_io_restore_insn: |
07a63cbe | 1292 | .quad .Lio_exit_timer |
86ed42f4 | 1293 | .quad .Lio_done - 4 |
ae6aa2ea | 1294 | |
86ed42f4 | 1295 | .Lcleanup_idle: |
419123f9 | 1296 | ni __LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT |
4c1051e3 | 1297 | # copy interrupt clock & cpu timer |
27f6b416 MS |
1298 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK |
1299 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER | |
4c1051e3 MS |
1300 | cghi %r11,__LC_SAVE_AREA_ASYNC |
1301 | je 0f | |
27f6b416 MS |
1302 | mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK |
1303 | mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER | |
4c1051e3 | 1304 | 0: # check if stck & stpt have been executed |
86ed42f4 | 1305 | clg %r9,BASED(.Lcleanup_idle_insn) |
4c1051e3 | 1306 | jhe 1f |
27f6b416 MS |
1307 | mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) |
1308 | mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) | |
72d38b19 MS |
1309 | 1: # calculate idle cycles |
1310 | #ifdef CONFIG_SMP | |
1311 | clg %r9,BASED(.Lcleanup_idle_insn) | |
1312 | jl 3f | |
1313 | larl %r1,smp_cpu_mtid | |
1314 | llgf %r1,0(%r1) | |
1315 | ltgr %r1,%r1 | |
1316 | jz 3f | |
1317 | .insn rsy,0xeb0000000017,%r1,5,__SF_EMPTY+80(%r15) | |
1318 | larl %r3,mt_cycles | |
1319 | ag %r3,__LC_PERCPU_OFFSET | |
1320 | la %r4,__SF_EMPTY+16(%r15) | |
1321 | 2: lg %r0,0(%r3) | |
1322 | slg %r0,0(%r4) | |
1323 | alg %r0,64(%r4) | |
1324 | stg %r0,0(%r3) | |
1325 | la %r3,8(%r3) | |
1326 | la %r4,8(%r4) | |
1327 | brct %r1,2b | |
1328 | #endif | |
1329 | 3: # account system time going idle | |
4c1051e3 | 1330 | lg %r9,__LC_STEAL_TIMER |
27f6b416 | 1331 | alg %r9,__CLOCK_IDLE_ENTER(%r2) |
4c1051e3 MS |
1332 | slg %r9,__LC_LAST_UPDATE_CLOCK |
1333 | stg %r9,__LC_STEAL_TIMER | |
27f6b416 | 1334 | mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) |
4c1051e3 MS |
1335 | lg %r9,__LC_SYSTEM_TIMER |
1336 | alg %r9,__LC_LAST_UPDATE_TIMER | |
27f6b416 | 1337 | slg %r9,__TIMER_IDLE_ENTER(%r2) |
4c1051e3 | 1338 | stg %r9,__LC_SYSTEM_TIMER |
27f6b416 | 1339 | mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) |
4c1051e3 | 1340 | # prepare return psw |
0587d409 | 1341 | nihh %r8,0xfcfd # clear irq & wait state bits |
4c1051e3 MS |
1342 | lg %r9,48(%r11) # return from psw_idle |
1343 | br %r14 | |
86ed42f4 MS |
1344 | .Lcleanup_idle_insn: |
1345 | .quad .Lpsw_idle_lpsw | |
4c1051e3 | 1346 | |
9977e886 | 1347 | .Lcleanup_save_fpu_regs: |
e370e476 | 1348 | larl %r9,save_fpu_regs |
9977e886 | 1349 | br %r14 |
9977e886 HB |
1350 | |
1351 | .Lcleanup_load_fpu_regs: | |
e370e476 | 1352 | larl %r9,load_fpu_regs |
9977e886 | 1353 | br %r14 |
9977e886 | 1354 | |
1da177e4 LT |
1355 | /* |
1356 | * Integer constants | |
1357 | */ | |
c5328901 | 1358 | .align 8 |
1da177e4 | 1359 | .Lcritical_start: |
86ed42f4 | 1360 | .quad .L__critical_start |
c5328901 | 1361 | .Lcritical_length: |
86ed42f4 | 1362 | .quad .L__critical_end - .L__critical_start |
61aa4884 | 1363 | #if IS_ENABLED(CONFIG_KVM) |
d0fc4107 | 1364 | .Lsie_critical_start: |
86ed42f4 | 1365 | .quad .Lsie_gmap |
7c470539 | 1366 | .Lsie_critical_length: |
86ed42f4 | 1367 | .quad .Lsie_done - .Lsie_gmap |
c929500d QH |
1368 | .Lsie_crit_mcck_start: |
1369 | .quad .Lsie_entry | |
1370 | .Lsie_crit_mcck_length: | |
73912dda | 1371 | .quad .Lsie_exit - .Lsie_entry |
603d1a50 MS |
1372 | #endif |
1373 | ||
a876cb3f HC |
1374 | .section .rodata, "a" |
1375 | #define SYSCALL(esame,emu) .long esame | |
9bf1226b | 1376 | .globl sys_call_table |
1da177e4 LT |
1377 | sys_call_table: |
1378 | #include "syscalls.S" | |
1379 | #undef SYSCALL | |
1380 | ||
347a8dc3 | 1381 | #ifdef CONFIG_COMPAT |
1da177e4 | 1382 | |
a876cb3f | 1383 | #define SYSCALL(esame,emu) .long emu |
61649881 | 1384 | .globl sys_call_table_emu |
1da177e4 LT |
1385 | sys_call_table_emu: |
1386 | #include "syscalls.S" | |
1387 | #undef SYSCALL | |
1388 | #endif |