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1 /*
2 * This file contains the 64-bit "server" PowerPC variant
3 * of the low level exception handling including exception
4 * vectors, exception return, part of the slb and stab
5 * handling and other fixed offset specific things.
6 *
7 * This file is meant to be #included from head_64.S due to
8 * position dependent assembly.
9 *
10 * Most of this originates from head_64.S and thus has the same
11 * copyright history.
12 *
13 */
14
15 #include <asm/hw_irq.h>
16 #include <asm/exception-64s.h>
17 #include <asm/ptrace.h>
18 #include <asm/cpuidle.h>
19
20 /*
21 * We layout physical memory as follows:
22 * 0x0000 - 0x00ff : Secondary processor spin code
23 * 0x0100 - 0x17ff : pSeries Interrupt prologs
24 * 0x1800 - 0x4000 : interrupt support common interrupt prologs
25 * 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1
26 * 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1
27 * 0x7000 - 0x7fff : FWNMI data area
28 * 0x8000 - 0x8fff : Initial (CPU0) segment table
29 * 0x9000 - : Early init and support code
30 */
31 /* Syscall routine is used twice, in reloc-off and reloc-on paths */
32 #define SYSCALL_PSERIES_1 \
33 BEGIN_FTR_SECTION \
34 cmpdi r0,0x1ebe ; \
35 beq- 1f ; \
36 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
37 mr r9,r13 ; \
38 GET_PACA(r13) ; \
39 mfspr r11,SPRN_SRR0 ; \
40 0:
41
42 #define SYSCALL_PSERIES_2_RFID \
43 mfspr r12,SPRN_SRR1 ; \
44 ld r10,PACAKBASE(r13) ; \
45 LOAD_HANDLER(r10, system_call_entry) ; \
46 mtspr SPRN_SRR0,r10 ; \
47 ld r10,PACAKMSR(r13) ; \
48 mtspr SPRN_SRR1,r10 ; \
49 rfid ; \
50 b . ; /* prevent speculative execution */
51
52 #define SYSCALL_PSERIES_3 \
53 /* Fast LE/BE switch system call */ \
54 1: mfspr r12,SPRN_SRR1 ; \
55 xori r12,r12,MSR_LE ; \
56 mtspr SPRN_SRR1,r12 ; \
57 rfid ; /* return to userspace */ \
58 b . ; /* prevent speculative execution */
59
60 #if defined(CONFIG_RELOCATABLE)
61 /*
62 * We can't branch directly; in the direct case we use LR
63 * and system_call_entry restores LR. (We thus need to move
64 * LR to r10 in the RFID case too.)
65 */
66 #define SYSCALL_PSERIES_2_DIRECT \
67 mflr r10 ; \
68 ld r12,PACAKBASE(r13) ; \
69 LOAD_HANDLER(r12, system_call_entry_direct) ; \
70 mtctr r12 ; \
71 mfspr r12,SPRN_SRR1 ; \
72 /* Re-use of r13... No spare regs to do this */ \
73 li r13,MSR_RI ; \
74 mtmsrd r13,1 ; \
75 GET_PACA(r13) ; /* get r13 back */ \
76 bctr ;
77 #else
78 /* We can branch directly */
79 #define SYSCALL_PSERIES_2_DIRECT \
80 mfspr r12,SPRN_SRR1 ; \
81 li r10,MSR_RI ; \
82 mtmsrd r10,1 ; /* Set RI (EE=0) */ \
83 b system_call_entry_direct ;
84 #endif
85
86 /*
87 * This is the start of the interrupt handlers for pSeries
88 * This code runs with relocation off.
89 * Code from here to __end_interrupts gets copied down to real
90 * address 0x100 when we are running a relocatable kernel.
91 * Therefore any relative branches in this section must only
92 * branch to labels in this section.
93 */
94 . = 0x100
95 .globl __start_interrupts
96 __start_interrupts:
97
98 .globl system_reset_pSeries;
99 system_reset_pSeries:
100 HMT_MEDIUM_PPR_DISCARD
101 SET_SCRATCH0(r13)
102 #ifdef CONFIG_PPC_P7_NAP
103 BEGIN_FTR_SECTION
104 /* Running native on arch 2.06 or later, check if we are
105 * waking up from nap/sleep/winkle.
106 */
107 mfspr r13,SPRN_SRR1
108 rlwinm. r13,r13,47-31,30,31
109 beq 9f
110
111 cmpwi cr3,r13,2
112
113 /*
114 * Check if last bit of HSPGR0 is set. This indicates whether we are
115 * waking up from winkle.
116 */
117 GET_PACA(r13)
118 clrldi r5,r13,63
119 clrrdi r13,r13,1
120 cmpwi cr4,r5,1
121 mtspr SPRN_HSPRG0,r13
122
123 lbz r0,PACA_THREAD_IDLE_STATE(r13)
124 cmpwi cr2,r0,PNV_THREAD_NAP
125 bgt cr2,8f /* Either sleep or Winkle */
126
127 /* Waking up from nap should not cause hypervisor state loss */
128 bgt cr3,.
129
130 /* Waking up from nap */
131 li r0,PNV_THREAD_RUNNING
132 stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */
133
134 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
135 li r0,KVM_HWTHREAD_IN_KERNEL
136 stb r0,HSTATE_HWTHREAD_STATE(r13)
137 /* Order setting hwthread_state vs. testing hwthread_req */
138 sync
139 lbz r0,HSTATE_HWTHREAD_REQ(r13)
140 cmpwi r0,0
141 beq 1f
142 b kvm_start_guest
143 1:
144 #endif
145
146 /* Return SRR1 from power7_nap() */
147 mfspr r3,SPRN_SRR1
148 beq cr3,2f
149 b power7_wakeup_noloss
150 2: b power7_wakeup_loss
151
152 /* Fast Sleep wakeup on PowerNV */
153 8: GET_PACA(r13)
154 b power7_wakeup_tb_loss
155
156 9:
157 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
158 #endif /* CONFIG_PPC_P7_NAP */
159 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
160 NOTEST, 0x100)
161
162 . = 0x200
163 machine_check_pSeries_1:
164 /* This is moved out of line as it can be patched by FW, but
165 * some code path might still want to branch into the original
166 * vector
167 */
168 HMT_MEDIUM_PPR_DISCARD
169 SET_SCRATCH0(r13) /* save r13 */
170 #ifdef CONFIG_PPC_P7_NAP
171 BEGIN_FTR_SECTION
172 /* Running native on arch 2.06 or later, check if we are
173 * waking up from nap. We only handle no state loss and
174 * supervisor state loss. We do -not- handle hypervisor
175 * state loss at this time.
176 */
177 mfspr r13,SPRN_SRR1
178 rlwinm. r13,r13,47-31,30,31
179 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
180 beq 9f
181
182 mfspr r13,SPRN_SRR1
183 rlwinm. r13,r13,47-31,30,31
184 /* waking up from powersave (nap) state */
185 cmpwi cr1,r13,2
186 /* Total loss of HV state is fatal. let's just stay stuck here */
187 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
188 bgt cr1,.
189 9:
190 OPT_SET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
191 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
192 #endif /* CONFIG_PPC_P7_NAP */
193 EXCEPTION_PROLOG_0(PACA_EXMC)
194 BEGIN_FTR_SECTION
195 b machine_check_pSeries_early
196 FTR_SECTION_ELSE
197 b machine_check_pSeries_0
198 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
199
200 . = 0x300
201 .globl data_access_pSeries
202 data_access_pSeries:
203 HMT_MEDIUM_PPR_DISCARD
204 SET_SCRATCH0(r13)
205 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
206 KVMTEST, 0x300)
207
208 . = 0x380
209 .globl data_access_slb_pSeries
210 data_access_slb_pSeries:
211 HMT_MEDIUM_PPR_DISCARD
212 SET_SCRATCH0(r13)
213 EXCEPTION_PROLOG_0(PACA_EXSLB)
214 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
215 std r3,PACA_EXSLB+EX_R3(r13)
216 mfspr r3,SPRN_DAR
217 #ifdef __DISABLED__
218 /* Keep that around for when we re-implement dynamic VSIDs */
219 cmpdi r3,0
220 bge slb_miss_user_pseries
221 #endif /* __DISABLED__ */
222 mfspr r12,SPRN_SRR1
223 #ifndef CONFIG_RELOCATABLE
224 b slb_miss_realmode
225 #else
226 /*
227 * We can't just use a direct branch to slb_miss_realmode
228 * because the distance from here to there depends on where
229 * the kernel ends up being put.
230 */
231 mfctr r11
232 ld r10,PACAKBASE(r13)
233 LOAD_HANDLER(r10, slb_miss_realmode)
234 mtctr r10
235 bctr
236 #endif
237
238 STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
239
240 . = 0x480
241 .globl instruction_access_slb_pSeries
242 instruction_access_slb_pSeries:
243 HMT_MEDIUM_PPR_DISCARD
244 SET_SCRATCH0(r13)
245 EXCEPTION_PROLOG_0(PACA_EXSLB)
246 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
247 std r3,PACA_EXSLB+EX_R3(r13)
248 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
249 #ifdef __DISABLED__
250 /* Keep that around for when we re-implement dynamic VSIDs */
251 cmpdi r3,0
252 bge slb_miss_user_pseries
253 #endif /* __DISABLED__ */
254 mfspr r12,SPRN_SRR1
255 #ifndef CONFIG_RELOCATABLE
256 b slb_miss_realmode
257 #else
258 mfctr r11
259 ld r10,PACAKBASE(r13)
260 LOAD_HANDLER(r10, slb_miss_realmode)
261 mtctr r10
262 bctr
263 #endif
264
265 /* We open code these as we can't have a ". = x" (even with
266 * x = "." within a feature section
267 */
268 . = 0x500;
269 .globl hardware_interrupt_pSeries;
270 .globl hardware_interrupt_hv;
271 hardware_interrupt_pSeries:
272 hardware_interrupt_hv:
273 HMT_MEDIUM_PPR_DISCARD
274 BEGIN_FTR_SECTION
275 _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
276 EXC_HV, SOFTEN_TEST_HV)
277 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
278 FTR_SECTION_ELSE
279 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
280 EXC_STD, SOFTEN_TEST_HV_201)
281 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
282 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
283
284 STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
285 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
286
287 STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
288 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
289
290 STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
291 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
292
293 . = 0x900
294 .globl decrementer_pSeries
295 decrementer_pSeries:
296 _MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR)
297
298 STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
299
300 MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
301 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
302
303 STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
304 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
305
306 . = 0xc00
307 .globl system_call_pSeries
308 system_call_pSeries:
309 /*
310 * If CONFIG_KVM_BOOK3S_64_HANDLER is set, save the PPR (on systems
311 * that support it) before changing to HMT_MEDIUM. That allows the KVM
312 * code to save that value into the guest state (it is the guest's PPR
313 * value). Otherwise just change to HMT_MEDIUM as userspace has
314 * already saved the PPR.
315 */
316 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
317 SET_SCRATCH0(r13)
318 GET_PACA(r13)
319 std r9,PACA_EXGEN+EX_R9(r13)
320 OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);
321 HMT_MEDIUM;
322 std r10,PACA_EXGEN+EX_R10(r13)
323 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r9, CPU_FTR_HAS_PPR);
324 mfcr r9
325 KVMTEST(0xc00)
326 GET_SCRATCH0(r13)
327 #else
328 HMT_MEDIUM;
329 #endif
330 SYSCALL_PSERIES_1
331 SYSCALL_PSERIES_2_RFID
332 SYSCALL_PSERIES_3
333 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
334
335 STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
336 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
337
338 /* At 0xe??? we have a bunch of hypervisor exceptions, we branch
339 * out of line to handle them
340 */
341 . = 0xe00
342 hv_data_storage_trampoline:
343 SET_SCRATCH0(r13)
344 EXCEPTION_PROLOG_0(PACA_EXGEN)
345 b h_data_storage_hv
346
347 . = 0xe20
348 hv_instr_storage_trampoline:
349 SET_SCRATCH0(r13)
350 EXCEPTION_PROLOG_0(PACA_EXGEN)
351 b h_instr_storage_hv
352
353 . = 0xe40
354 emulation_assist_trampoline:
355 SET_SCRATCH0(r13)
356 EXCEPTION_PROLOG_0(PACA_EXGEN)
357 b emulation_assist_hv
358
359 . = 0xe60
360 hv_exception_trampoline:
361 SET_SCRATCH0(r13)
362 EXCEPTION_PROLOG_0(PACA_EXGEN)
363 b hmi_exception_early
364
365 . = 0xe80
366 hv_doorbell_trampoline:
367 SET_SCRATCH0(r13)
368 EXCEPTION_PROLOG_0(PACA_EXGEN)
369 b h_doorbell_hv
370
371 /* We need to deal with the Altivec unavailable exception
372 * here which is at 0xf20, thus in the middle of the
373 * prolog code of the PerformanceMonitor one. A little
374 * trickery is thus necessary
375 */
376 . = 0xf00
377 performance_monitor_pseries_trampoline:
378 SET_SCRATCH0(r13)
379 EXCEPTION_PROLOG_0(PACA_EXGEN)
380 b performance_monitor_pSeries
381
382 . = 0xf20
383 altivec_unavailable_pseries_trampoline:
384 SET_SCRATCH0(r13)
385 EXCEPTION_PROLOG_0(PACA_EXGEN)
386 b altivec_unavailable_pSeries
387
388 . = 0xf40
389 vsx_unavailable_pseries_trampoline:
390 SET_SCRATCH0(r13)
391 EXCEPTION_PROLOG_0(PACA_EXGEN)
392 b vsx_unavailable_pSeries
393
394 . = 0xf60
395 facility_unavailable_trampoline:
396 SET_SCRATCH0(r13)
397 EXCEPTION_PROLOG_0(PACA_EXGEN)
398 b facility_unavailable_pSeries
399
400 . = 0xf80
401 hv_facility_unavailable_trampoline:
402 SET_SCRATCH0(r13)
403 EXCEPTION_PROLOG_0(PACA_EXGEN)
404 b facility_unavailable_hv
405
406 #ifdef CONFIG_CBE_RAS
407 STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
408 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
409 #endif /* CONFIG_CBE_RAS */
410
411 STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
412 KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
413
414 . = 0x1500
415 .global denorm_exception_hv
416 denorm_exception_hv:
417 HMT_MEDIUM_PPR_DISCARD
418 mtspr SPRN_SPRG_HSCRATCH0,r13
419 EXCEPTION_PROLOG_0(PACA_EXGEN)
420 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
421
422 #ifdef CONFIG_PPC_DENORMALISATION
423 mfspr r10,SPRN_HSRR1
424 mfspr r11,SPRN_HSRR0 /* save HSRR0 */
425 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
426 addi r11,r11,-4 /* HSRR0 is next instruction */
427 bne+ denorm_assist
428 #endif
429
430 KVMTEST(0x1500)
431 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
432 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500)
433
434 #ifdef CONFIG_CBE_RAS
435 STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
436 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
437 #endif /* CONFIG_CBE_RAS */
438
439 STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
440 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
441
442 #ifdef CONFIG_CBE_RAS
443 STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
444 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
445 #else
446 . = 0x1800
447 #endif /* CONFIG_CBE_RAS */
448
449
450 /*** Out of line interrupts support ***/
451
452 .align 7
453 /* moved from 0x200 */
454 machine_check_pSeries_early:
455 BEGIN_FTR_SECTION
456 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
457 /*
458 * Register contents:
459 * R13 = PACA
460 * R9 = CR
461 * Original R9 to R13 is saved on PACA_EXMC
462 *
463 * Switch to mc_emergency stack and handle re-entrancy (we limit
464 * the nested MCE upto level 4 to avoid stack overflow).
465 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1
466 *
467 * We use paca->in_mce to check whether this is the first entry or
468 * nested machine check. We increment paca->in_mce to track nested
469 * machine checks.
470 *
471 * If this is the first entry then set stack pointer to
472 * paca->mc_emergency_sp, otherwise r1 is already pointing to
473 * stack frame on mc_emergency stack.
474 *
475 * NOTE: We are here with MSR_ME=0 (off), which means we risk a
476 * checkstop if we get another machine check exception before we do
477 * rfid with MSR_ME=1.
478 */
479 mr r11,r1 /* Save r1 */
480 lhz r10,PACA_IN_MCE(r13)
481 cmpwi r10,0 /* Are we in nested machine check */
482 bne 0f /* Yes, we are. */
483 /* First machine check entry */
484 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
485 0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
486 addi r10,r10,1 /* increment paca->in_mce */
487 sth r10,PACA_IN_MCE(r13)
488 /* Limit nested MCE to level 4 to avoid stack overflow */
489 cmpwi r10,4
490 bgt 2f /* Check if we hit limit of 4 */
491 std r11,GPR1(r1) /* Save r1 on the stack. */
492 std r11,0(r1) /* make stack chain pointer */
493 mfspr r11,SPRN_SRR0 /* Save SRR0 */
494 std r11,_NIP(r1)
495 mfspr r11,SPRN_SRR1 /* Save SRR1 */
496 std r11,_MSR(r1)
497 mfspr r11,SPRN_DAR /* Save DAR */
498 std r11,_DAR(r1)
499 mfspr r11,SPRN_DSISR /* Save DSISR */
500 std r11,_DSISR(r1)
501 std r9,_CCR(r1) /* Save CR in stackframe */
502 /* Save r9 through r13 from EXMC save area to stack frame. */
503 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC)
504 mfmsr r11 /* get MSR value */
505 ori r11,r11,MSR_ME /* turn on ME bit */
506 ori r11,r11,MSR_RI /* turn on RI bit */
507 ld r12,PACAKBASE(r13) /* get high part of &label */
508 LOAD_HANDLER(r12, machine_check_handle_early)
509 1: mtspr SPRN_SRR0,r12
510 mtspr SPRN_SRR1,r11
511 rfid
512 b . /* prevent speculative execution */
513 2:
514 /* Stack overflow. Stay on emergency stack and panic.
515 * Keep the ME bit off while panic-ing, so that if we hit
516 * another machine check we checkstop.
517 */
518 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */
519 ld r11,PACAKMSR(r13)
520 ld r12,PACAKBASE(r13)
521 LOAD_HANDLER(r12, unrecover_mce)
522 li r10,MSR_ME
523 andc r11,r11,r10 /* Turn off MSR_ME */
524 b 1b
525 b . /* prevent speculative execution */
526 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
527
528 machine_check_pSeries:
529 .globl machine_check_fwnmi
530 machine_check_fwnmi:
531 HMT_MEDIUM_PPR_DISCARD
532 SET_SCRATCH0(r13) /* save r13 */
533 EXCEPTION_PROLOG_0(PACA_EXMC)
534 machine_check_pSeries_0:
535 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200)
536 EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD)
537 KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
538 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
539 KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
540 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400)
541 KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480)
542 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900)
543 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
544
545 #ifdef CONFIG_PPC_DENORMALISATION
546 denorm_assist:
547 BEGIN_FTR_SECTION
548 /*
549 * To denormalise we need to move a copy of the register to itself.
550 * For POWER6 do that here for all FP regs.
551 */
552 mfmsr r10
553 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
554 xori r10,r10,(MSR_FE0|MSR_FE1)
555 mtmsrd r10
556 sync
557
558 #define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
559 #define FMR4(n) FMR2(n) ; FMR2(n+2)
560 #define FMR8(n) FMR4(n) ; FMR4(n+4)
561 #define FMR16(n) FMR8(n) ; FMR8(n+8)
562 #define FMR32(n) FMR16(n) ; FMR16(n+16)
563 FMR32(0)
564
565 FTR_SECTION_ELSE
566 /*
567 * To denormalise we need to move a copy of the register to itself.
568 * For POWER7 do that here for the first 32 VSX registers only.
569 */
570 mfmsr r10
571 oris r10,r10,MSR_VSX@h
572 mtmsrd r10
573 sync
574
575 #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
576 #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
577 #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
578 #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
579 #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
580 XVCPSGNDP32(0)
581
582 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
583
584 BEGIN_FTR_SECTION
585 b denorm_done
586 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
587 /*
588 * To denormalise we need to move a copy of the register to itself.
589 * For POWER8 we need to do that for all 64 VSX registers
590 */
591 XVCPSGNDP32(32)
592 denorm_done:
593 mtspr SPRN_HSRR0,r11
594 mtcrf 0x80,r9
595 ld r9,PACA_EXGEN+EX_R9(r13)
596 RESTORE_PPR_PACA(PACA_EXGEN, r10)
597 BEGIN_FTR_SECTION
598 ld r10,PACA_EXGEN+EX_CFAR(r13)
599 mtspr SPRN_CFAR,r10
600 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
601 ld r10,PACA_EXGEN+EX_R10(r13)
602 ld r11,PACA_EXGEN+EX_R11(r13)
603 ld r12,PACA_EXGEN+EX_R12(r13)
604 ld r13,PACA_EXGEN+EX_R13(r13)
605 HRFID
606 b .
607 #endif
608
609 .align 7
610 /* moved from 0xe00 */
611 STD_EXCEPTION_HV_OOL(0xe02, h_data_storage)
612 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
613 STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage)
614 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
615 STD_EXCEPTION_HV_OOL(0xe42, emulation_assist)
616 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
617 MASKABLE_EXCEPTION_HV_OOL(0xe62, hmi_exception)
618 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
619
620 MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell)
621 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
622
623 /* moved from 0xf00 */
624 STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
625 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00)
626 STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
627 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20)
628 STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
629 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
630 STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
631 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60)
632 STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable)
633 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82)
634
635 /*
636 * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
637 * - If it was a decrementer interrupt, we bump the dec to max and and return.
638 * - If it was a doorbell we return immediately since doorbells are edge
639 * triggered and won't automatically refire.
640 * - If it was a HMI we return immediately since we handled it in realmode
641 * and it won't refire.
642 * - else we hard disable and return.
643 * This is called with r10 containing the value to OR to the paca field.
644 */
645 #define MASKED_INTERRUPT(_H) \
646 masked_##_H##interrupt: \
647 std r11,PACA_EXGEN+EX_R11(r13); \
648 lbz r11,PACAIRQHAPPENED(r13); \
649 or r11,r11,r10; \
650 stb r11,PACAIRQHAPPENED(r13); \
651 cmpwi r10,PACA_IRQ_DEC; \
652 bne 1f; \
653 lis r10,0x7fff; \
654 ori r10,r10,0xffff; \
655 mtspr SPRN_DEC,r10; \
656 b 2f; \
657 1: cmpwi r10,PACA_IRQ_DBELL; \
658 beq 2f; \
659 cmpwi r10,PACA_IRQ_HMI; \
660 beq 2f; \
661 mfspr r10,SPRN_##_H##SRR1; \
662 rldicl r10,r10,48,1; /* clear MSR_EE */ \
663 rotldi r10,r10,16; \
664 mtspr SPRN_##_H##SRR1,r10; \
665 2: mtcrf 0x80,r9; \
666 ld r9,PACA_EXGEN+EX_R9(r13); \
667 ld r10,PACA_EXGEN+EX_R10(r13); \
668 ld r11,PACA_EXGEN+EX_R11(r13); \
669 GET_SCRATCH0(r13); \
670 ##_H##rfid; \
671 b .
672
673 MASKED_INTERRUPT()
674 MASKED_INTERRUPT(H)
675
676 /*
677 * Called from arch_local_irq_enable when an interrupt needs
678 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
679 * which kind of interrupt. MSR:EE is already off. We generate a
680 * stackframe like if a real interrupt had happened.
681 *
682 * Note: While MSR:EE is off, we need to make sure that _MSR
683 * in the generated frame has EE set to 1 or the exception
684 * handler will not properly re-enable them.
685 */
686 _GLOBAL(__replay_interrupt)
687 /* We are going to jump to the exception common code which
688 * will retrieve various register values from the PACA which
689 * we don't give a damn about, so we don't bother storing them.
690 */
691 mfmsr r12
692 mflr r11
693 mfcr r9
694 ori r12,r12,MSR_EE
695 cmpwi r3,0x900
696 beq decrementer_common
697 cmpwi r3,0x500
698 beq hardware_interrupt_common
699 BEGIN_FTR_SECTION
700 cmpwi r3,0xe80
701 beq h_doorbell_common
702 FTR_SECTION_ELSE
703 cmpwi r3,0xa00
704 beq doorbell_super_common
705 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
706 blr
707
708 #ifdef CONFIG_PPC_PSERIES
709 /*
710 * Vectors for the FWNMI option. Share common code.
711 */
712 .globl system_reset_fwnmi
713 .align 7
714 system_reset_fwnmi:
715 HMT_MEDIUM_PPR_DISCARD
716 SET_SCRATCH0(r13) /* save r13 */
717 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
718 NOTEST, 0x100)
719
720 #endif /* CONFIG_PPC_PSERIES */
721
722 #ifdef __DISABLED__
723 /*
724 * This is used for when the SLB miss handler has to go virtual,
725 * which doesn't happen for now anymore but will once we re-implement
726 * dynamic VSIDs for shared page tables
727 */
728 slb_miss_user_pseries:
729 std r10,PACA_EXGEN+EX_R10(r13)
730 std r11,PACA_EXGEN+EX_R11(r13)
731 std r12,PACA_EXGEN+EX_R12(r13)
732 GET_SCRATCH0(r10)
733 ld r11,PACA_EXSLB+EX_R9(r13)
734 ld r12,PACA_EXSLB+EX_R3(r13)
735 std r10,PACA_EXGEN+EX_R13(r13)
736 std r11,PACA_EXGEN+EX_R9(r13)
737 std r12,PACA_EXGEN+EX_R3(r13)
738 clrrdi r12,r13,32
739 mfmsr r10
740 mfspr r11,SRR0 /* save SRR0 */
741 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
742 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
743 mtspr SRR0,r12
744 mfspr r12,SRR1 /* and SRR1 */
745 mtspr SRR1,r10
746 rfid
747 b . /* prevent spec. execution */
748 #endif /* __DISABLED__ */
749
750 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
751 kvmppc_skip_interrupt:
752 /*
753 * Here all GPRs are unchanged from when the interrupt happened
754 * except for r13, which is saved in SPRG_SCRATCH0.
755 */
756 mfspr r13, SPRN_SRR0
757 addi r13, r13, 4
758 mtspr SPRN_SRR0, r13
759 GET_SCRATCH0(r13)
760 rfid
761 b .
762
763 kvmppc_skip_Hinterrupt:
764 /*
765 * Here all GPRs are unchanged from when the interrupt happened
766 * except for r13, which is saved in SPRG_SCRATCH0.
767 */
768 mfspr r13, SPRN_HSRR0
769 addi r13, r13, 4
770 mtspr SPRN_HSRR0, r13
771 GET_SCRATCH0(r13)
772 hrfid
773 b .
774 #endif
775
776 /*
777 * Code from here down to __end_handlers is invoked from the
778 * exception prologs above. Because the prologs assemble the
779 * addresses of these handlers using the LOAD_HANDLER macro,
780 * which uses an ori instruction, these handlers must be in
781 * the first 64k of the kernel image.
782 */
783
784 /*** Common interrupt handlers ***/
785
786 STD_EXCEPTION_COMMON(0x100, system_reset, system_reset_exception)
787
788 STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
789 STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, timer_interrupt)
790 STD_EXCEPTION_COMMON(0x980, hdecrementer, hdec_interrupt)
791 #ifdef CONFIG_PPC_DOORBELL
792 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, doorbell_exception)
793 #else
794 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, unknown_exception)
795 #endif
796 STD_EXCEPTION_COMMON(0xb00, trap_0b, unknown_exception)
797 STD_EXCEPTION_COMMON(0xd00, single_step, single_step_exception)
798 STD_EXCEPTION_COMMON(0xe00, trap_0e, unknown_exception)
799 STD_EXCEPTION_COMMON(0xe40, emulation_assist, emulation_assist_interrupt)
800 STD_EXCEPTION_COMMON_ASYNC(0xe60, hmi_exception, handle_hmi_exception)
801 #ifdef CONFIG_PPC_DOORBELL
802 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, doorbell_exception)
803 #else
804 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, unknown_exception)
805 #endif
806 STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, performance_monitor_exception)
807 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, instruction_breakpoint_exception)
808 STD_EXCEPTION_COMMON(0x1502, denorm, unknown_exception)
809 #ifdef CONFIG_ALTIVEC
810 STD_EXCEPTION_COMMON(0x1700, altivec_assist, altivec_assist_exception)
811 #else
812 STD_EXCEPTION_COMMON(0x1700, altivec_assist, unknown_exception)
813 #endif
814 #ifdef CONFIG_CBE_RAS
815 STD_EXCEPTION_COMMON(0x1200, cbe_system_error, cbe_system_error_exception)
816 STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, cbe_maintenance_exception)
817 STD_EXCEPTION_COMMON(0x1800, cbe_thermal, cbe_thermal_exception)
818 #endif /* CONFIG_CBE_RAS */
819
820 /*
821 * Relocation-on interrupts: A subset of the interrupts can be delivered
822 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
823 * it. Addresses are the same as the original interrupt addresses, but
824 * offset by 0xc000000000004000.
825 * It's impossible to receive interrupts below 0x300 via this mechanism.
826 * KVM: None of these traps are from the guest ; anything that escalated
827 * to HV=1 from HV=0 is delivered via real mode handlers.
828 */
829
830 /*
831 * This uses the standard macro, since the original 0x300 vector
832 * only has extra guff for STAB-based processors -- which never
833 * come here.
834 */
835 STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access)
836 . = 0x4380
837 .globl data_access_slb_relon_pSeries
838 data_access_slb_relon_pSeries:
839 SET_SCRATCH0(r13)
840 EXCEPTION_PROLOG_0(PACA_EXSLB)
841 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
842 std r3,PACA_EXSLB+EX_R3(r13)
843 mfspr r3,SPRN_DAR
844 mfspr r12,SPRN_SRR1
845 #ifndef CONFIG_RELOCATABLE
846 b slb_miss_realmode
847 #else
848 /*
849 * We can't just use a direct branch to slb_miss_realmode
850 * because the distance from here to there depends on where
851 * the kernel ends up being put.
852 */
853 mfctr r11
854 ld r10,PACAKBASE(r13)
855 LOAD_HANDLER(r10, slb_miss_realmode)
856 mtctr r10
857 bctr
858 #endif
859
860 STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access)
861 . = 0x4480
862 .globl instruction_access_slb_relon_pSeries
863 instruction_access_slb_relon_pSeries:
864 SET_SCRATCH0(r13)
865 EXCEPTION_PROLOG_0(PACA_EXSLB)
866 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
867 std r3,PACA_EXSLB+EX_R3(r13)
868 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
869 mfspr r12,SPRN_SRR1
870 #ifndef CONFIG_RELOCATABLE
871 b slb_miss_realmode
872 #else
873 mfctr r11
874 ld r10,PACAKBASE(r13)
875 LOAD_HANDLER(r10, slb_miss_realmode)
876 mtctr r10
877 bctr
878 #endif
879
880 . = 0x4500
881 .globl hardware_interrupt_relon_pSeries;
882 .globl hardware_interrupt_relon_hv;
883 hardware_interrupt_relon_pSeries:
884 hardware_interrupt_relon_hv:
885 BEGIN_FTR_SECTION
886 _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
887 FTR_SECTION_ELSE
888 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
889 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
890 STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
891 STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
892 STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
893 MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
894 STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
895 MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
896 STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
897
898 . = 0x4c00
899 .globl system_call_relon_pSeries
900 system_call_relon_pSeries:
901 HMT_MEDIUM
902 SYSCALL_PSERIES_1
903 SYSCALL_PSERIES_2_DIRECT
904 SYSCALL_PSERIES_3
905
906 STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step)
907
908 . = 0x4e00
909 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
910
911 . = 0x4e20
912 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
913
914 . = 0x4e40
915 emulation_assist_relon_trampoline:
916 SET_SCRATCH0(r13)
917 EXCEPTION_PROLOG_0(PACA_EXGEN)
918 b emulation_assist_relon_hv
919
920 . = 0x4e60
921 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
922
923 . = 0x4e80
924 h_doorbell_relon_trampoline:
925 SET_SCRATCH0(r13)
926 EXCEPTION_PROLOG_0(PACA_EXGEN)
927 b h_doorbell_relon_hv
928
929 . = 0x4f00
930 performance_monitor_relon_pseries_trampoline:
931 SET_SCRATCH0(r13)
932 EXCEPTION_PROLOG_0(PACA_EXGEN)
933 b performance_monitor_relon_pSeries
934
935 . = 0x4f20
936 altivec_unavailable_relon_pseries_trampoline:
937 SET_SCRATCH0(r13)
938 EXCEPTION_PROLOG_0(PACA_EXGEN)
939 b altivec_unavailable_relon_pSeries
940
941 . = 0x4f40
942 vsx_unavailable_relon_pseries_trampoline:
943 SET_SCRATCH0(r13)
944 EXCEPTION_PROLOG_0(PACA_EXGEN)
945 b vsx_unavailable_relon_pSeries
946
947 . = 0x4f60
948 facility_unavailable_relon_trampoline:
949 SET_SCRATCH0(r13)
950 EXCEPTION_PROLOG_0(PACA_EXGEN)
951 b facility_unavailable_relon_pSeries
952
953 . = 0x4f80
954 hv_facility_unavailable_relon_trampoline:
955 SET_SCRATCH0(r13)
956 EXCEPTION_PROLOG_0(PACA_EXGEN)
957 b hv_facility_unavailable_relon_hv
958
959 STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
960 #ifdef CONFIG_PPC_DENORMALISATION
961 . = 0x5500
962 b denorm_exception_hv
963 #endif
964 STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist)
965
966 /* Other future vectors */
967 .align 7
968 .globl __end_interrupts
969 __end_interrupts:
970
971 .align 7
972 system_call_entry_direct:
973 #if defined(CONFIG_RELOCATABLE)
974 /* The first level prologue may have used LR to get here, saving
975 * orig in r10. To save hacking/ifdeffing common code, restore here.
976 */
977 mtlr r10
978 #endif
979 system_call_entry:
980 b system_call_common
981
982 ppc64_runlatch_on_trampoline:
983 b __ppc64_runlatch_on
984
985 /*
986 * Here r13 points to the paca, r9 contains the saved CR,
987 * SRR0 and SRR1 are saved in r11 and r12,
988 * r9 - r13 are saved in paca->exgen.
989 */
990 .align 7
991 .globl data_access_common
992 data_access_common:
993 mfspr r10,SPRN_DAR
994 std r10,PACA_EXGEN+EX_DAR(r13)
995 mfspr r10,SPRN_DSISR
996 stw r10,PACA_EXGEN+EX_DSISR(r13)
997 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
998 RECONCILE_IRQ_STATE(r10, r11)
999 ld r12,_MSR(r1)
1000 ld r3,PACA_EXGEN+EX_DAR(r13)
1001 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1002 li r5,0x300
1003 b do_hash_page /* Try to handle as hpte fault */
1004
1005 .align 7
1006 .globl h_data_storage_common
1007 h_data_storage_common:
1008 mfspr r10,SPRN_HDAR
1009 std r10,PACA_EXGEN+EX_DAR(r13)
1010 mfspr r10,SPRN_HDSISR
1011 stw r10,PACA_EXGEN+EX_DSISR(r13)
1012 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
1013 bl save_nvgprs
1014 RECONCILE_IRQ_STATE(r10, r11)
1015 addi r3,r1,STACK_FRAME_OVERHEAD
1016 bl unknown_exception
1017 b ret_from_except
1018
1019 .align 7
1020 .globl instruction_access_common
1021 instruction_access_common:
1022 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
1023 RECONCILE_IRQ_STATE(r10, r11)
1024 ld r12,_MSR(r1)
1025 ld r3,_NIP(r1)
1026 andis. r4,r12,0x5820
1027 li r5,0x400
1028 b do_hash_page /* Try to handle as hpte fault */
1029
1030 STD_EXCEPTION_COMMON(0xe20, h_instr_storage, unknown_exception)
1031
1032 /*
1033 * Here is the common SLB miss user that is used when going to virtual
1034 * mode for SLB misses, that is currently not used
1035 */
1036 #ifdef __DISABLED__
1037 .align 7
1038 .globl slb_miss_user_common
1039 slb_miss_user_common:
1040 mflr r10
1041 std r3,PACA_EXGEN+EX_DAR(r13)
1042 stw r9,PACA_EXGEN+EX_CCR(r13)
1043 std r10,PACA_EXGEN+EX_LR(r13)
1044 std r11,PACA_EXGEN+EX_SRR0(r13)
1045 bl slb_allocate_user
1046
1047 ld r10,PACA_EXGEN+EX_LR(r13)
1048 ld r3,PACA_EXGEN+EX_R3(r13)
1049 lwz r9,PACA_EXGEN+EX_CCR(r13)
1050 ld r11,PACA_EXGEN+EX_SRR0(r13)
1051 mtlr r10
1052 beq- slb_miss_fault
1053
1054 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1055 beq- unrecov_user_slb
1056 mfmsr r10
1057
1058 .machine push
1059 .machine "power4"
1060 mtcrf 0x80,r9
1061 .machine pop
1062
1063 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
1064 mtmsrd r10,1
1065
1066 mtspr SRR0,r11
1067 mtspr SRR1,r12
1068
1069 ld r9,PACA_EXGEN+EX_R9(r13)
1070 ld r10,PACA_EXGEN+EX_R10(r13)
1071 ld r11,PACA_EXGEN+EX_R11(r13)
1072 ld r12,PACA_EXGEN+EX_R12(r13)
1073 ld r13,PACA_EXGEN+EX_R13(r13)
1074 rfid
1075 b .
1076
1077 slb_miss_fault:
1078 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
1079 ld r4,PACA_EXGEN+EX_DAR(r13)
1080 li r5,0
1081 std r4,_DAR(r1)
1082 std r5,_DSISR(r1)
1083 b handle_page_fault
1084
1085 unrecov_user_slb:
1086 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
1087 RECONCILE_IRQ_STATE(r10, r11)
1088 bl save_nvgprs
1089 1: addi r3,r1,STACK_FRAME_OVERHEAD
1090 bl unrecoverable_exception
1091 b 1b
1092
1093 #endif /* __DISABLED__ */
1094
1095
1096 /*
1097 * Machine check is different because we use a different
1098 * save area: PACA_EXMC instead of PACA_EXGEN.
1099 */
1100 .align 7
1101 .globl machine_check_common
1102 machine_check_common:
1103
1104 mfspr r10,SPRN_DAR
1105 std r10,PACA_EXGEN+EX_DAR(r13)
1106 mfspr r10,SPRN_DSISR
1107 stw r10,PACA_EXGEN+EX_DSISR(r13)
1108 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
1109 FINISH_NAP
1110 RECONCILE_IRQ_STATE(r10, r11)
1111 ld r3,PACA_EXGEN+EX_DAR(r13)
1112 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1113 std r3,_DAR(r1)
1114 std r4,_DSISR(r1)
1115 bl save_nvgprs
1116 addi r3,r1,STACK_FRAME_OVERHEAD
1117 bl machine_check_exception
1118 b ret_from_except
1119
1120 .align 7
1121 .globl alignment_common
1122 alignment_common:
1123 mfspr r10,SPRN_DAR
1124 std r10,PACA_EXGEN+EX_DAR(r13)
1125 mfspr r10,SPRN_DSISR
1126 stw r10,PACA_EXGEN+EX_DSISR(r13)
1127 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1128 ld r3,PACA_EXGEN+EX_DAR(r13)
1129 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1130 std r3,_DAR(r1)
1131 std r4,_DSISR(r1)
1132 bl save_nvgprs
1133 RECONCILE_IRQ_STATE(r10, r11)
1134 addi r3,r1,STACK_FRAME_OVERHEAD
1135 bl alignment_exception
1136 b ret_from_except
1137
1138 .align 7
1139 .globl program_check_common
1140 program_check_common:
1141 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1142 bl save_nvgprs
1143 RECONCILE_IRQ_STATE(r10, r11)
1144 addi r3,r1,STACK_FRAME_OVERHEAD
1145 bl program_check_exception
1146 b ret_from_except
1147
1148 .align 7
1149 .globl fp_unavailable_common
1150 fp_unavailable_common:
1151 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1152 bne 1f /* if from user, just load it up */
1153 bl save_nvgprs
1154 RECONCILE_IRQ_STATE(r10, r11)
1155 addi r3,r1,STACK_FRAME_OVERHEAD
1156 bl kernel_fp_unavailable_exception
1157 BUG_OPCODE
1158 1:
1159 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1160 BEGIN_FTR_SECTION
1161 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1162 * transaction), go do TM stuff
1163 */
1164 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1165 bne- 2f
1166 END_FTR_SECTION_IFSET(CPU_FTR_TM)
1167 #endif
1168 bl load_up_fpu
1169 b fast_exception_return
1170 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1171 2: /* User process was in a transaction */
1172 bl save_nvgprs
1173 RECONCILE_IRQ_STATE(r10, r11)
1174 addi r3,r1,STACK_FRAME_OVERHEAD
1175 bl fp_unavailable_tm
1176 b ret_from_except
1177 #endif
1178 .align 7
1179 .globl altivec_unavailable_common
1180 altivec_unavailable_common:
1181 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1182 #ifdef CONFIG_ALTIVEC
1183 BEGIN_FTR_SECTION
1184 beq 1f
1185 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1186 BEGIN_FTR_SECTION_NESTED(69)
1187 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1188 * transaction), go do TM stuff
1189 */
1190 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1191 bne- 2f
1192 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1193 #endif
1194 bl load_up_altivec
1195 b fast_exception_return
1196 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1197 2: /* User process was in a transaction */
1198 bl save_nvgprs
1199 RECONCILE_IRQ_STATE(r10, r11)
1200 addi r3,r1,STACK_FRAME_OVERHEAD
1201 bl altivec_unavailable_tm
1202 b ret_from_except
1203 #endif
1204 1:
1205 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1206 #endif
1207 bl save_nvgprs
1208 RECONCILE_IRQ_STATE(r10, r11)
1209 addi r3,r1,STACK_FRAME_OVERHEAD
1210 bl altivec_unavailable_exception
1211 b ret_from_except
1212
1213 .align 7
1214 .globl vsx_unavailable_common
1215 vsx_unavailable_common:
1216 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
1217 #ifdef CONFIG_VSX
1218 BEGIN_FTR_SECTION
1219 beq 1f
1220 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1221 BEGIN_FTR_SECTION_NESTED(69)
1222 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1223 * transaction), go do TM stuff
1224 */
1225 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1226 bne- 2f
1227 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1228 #endif
1229 b load_up_vsx
1230 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1231 2: /* User process was in a transaction */
1232 bl save_nvgprs
1233 RECONCILE_IRQ_STATE(r10, r11)
1234 addi r3,r1,STACK_FRAME_OVERHEAD
1235 bl vsx_unavailable_tm
1236 b ret_from_except
1237 #endif
1238 1:
1239 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
1240 #endif
1241 bl save_nvgprs
1242 RECONCILE_IRQ_STATE(r10, r11)
1243 addi r3,r1,STACK_FRAME_OVERHEAD
1244 bl vsx_unavailable_exception
1245 b ret_from_except
1246
1247 STD_EXCEPTION_COMMON(0xf60, facility_unavailable, facility_unavailable_exception)
1248 STD_EXCEPTION_COMMON(0xf80, hv_facility_unavailable, facility_unavailable_exception)
1249
1250 .align 7
1251 .globl __end_handlers
1252 __end_handlers:
1253
1254 /* Equivalents to the above handlers for relocation-on interrupt vectors */
1255 STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
1256 MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell)
1257
1258 STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
1259 STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
1260 STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
1261 STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
1262 STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_unavailable)
1263
1264 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
1265 /*
1266 * Data area reserved for FWNMI option.
1267 * This address (0x7000) is fixed by the RPA.
1268 */
1269 .= 0x7000
1270 .globl fwnmi_data_area
1271 fwnmi_data_area:
1272
1273 /* pseries and powernv need to keep the whole page from
1274 * 0x7000 to 0x8000 free for use by the firmware
1275 */
1276 . = 0x8000
1277 #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1278
1279 .globl hmi_exception_early
1280 hmi_exception_early:
1281 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0xe60)
1282 mr r10,r1 /* Save r1 */
1283 ld r1,PACAEMERGSP(r13) /* Use emergency stack */
1284 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
1285 std r9,_CCR(r1) /* save CR in stackframe */
1286 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
1287 std r11,_NIP(r1) /* save HSRR0 in stackframe */
1288 mfspr r12,SPRN_HSRR1 /* Save SRR1 */
1289 std r12,_MSR(r1) /* save SRR1 in stackframe */
1290 std r10,0(r1) /* make stack chain pointer */
1291 std r0,GPR0(r1) /* save r0 in stackframe */
1292 std r10,GPR1(r1) /* save r1 in stackframe */
1293 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
1294 EXCEPTION_PROLOG_COMMON_3(0xe60)
1295 addi r3,r1,STACK_FRAME_OVERHEAD
1296 bl hmi_exception_realmode
1297 /* Windup the stack. */
1298 /* Move original HSRR0 and HSRR1 into the respective regs */
1299 ld r9,_MSR(r1)
1300 mtspr SPRN_HSRR1,r9
1301 ld r3,_NIP(r1)
1302 mtspr SPRN_HSRR0,r3
1303 ld r9,_CTR(r1)
1304 mtctr r9
1305 ld r9,_XER(r1)
1306 mtxer r9
1307 ld r9,_LINK(r1)
1308 mtlr r9
1309 REST_GPR(0, r1)
1310 REST_8GPRS(2, r1)
1311 REST_GPR(10, r1)
1312 ld r11,_CCR(r1)
1313 mtcr r11
1314 REST_GPR(11, r1)
1315 REST_2GPRS(12, r1)
1316 /* restore original r1. */
1317 ld r1,GPR1(r1)
1318
1319 /*
1320 * Go to virtual mode and pull the HMI event information from
1321 * firmware.
1322 */
1323 .globl hmi_exception_after_realmode
1324 hmi_exception_after_realmode:
1325 SET_SCRATCH0(r13)
1326 EXCEPTION_PROLOG_0(PACA_EXGEN)
1327 b hmi_exception_hv
1328
1329
1330 #define MACHINE_CHECK_HANDLER_WINDUP \
1331 /* Clear MSR_RI before setting SRR0 and SRR1. */\
1332 li r0,MSR_RI; \
1333 mfmsr r9; /* get MSR value */ \
1334 andc r9,r9,r0; \
1335 mtmsrd r9,1; /* Clear MSR_RI */ \
1336 /* Move original SRR0 and SRR1 into the respective regs */ \
1337 ld r9,_MSR(r1); \
1338 mtspr SPRN_SRR1,r9; \
1339 ld r3,_NIP(r1); \
1340 mtspr SPRN_SRR0,r3; \
1341 ld r9,_CTR(r1); \
1342 mtctr r9; \
1343 ld r9,_XER(r1); \
1344 mtxer r9; \
1345 ld r9,_LINK(r1); \
1346 mtlr r9; \
1347 REST_GPR(0, r1); \
1348 REST_8GPRS(2, r1); \
1349 REST_GPR(10, r1); \
1350 ld r11,_CCR(r1); \
1351 mtcr r11; \
1352 /* Decrement paca->in_mce. */ \
1353 lhz r12,PACA_IN_MCE(r13); \
1354 subi r12,r12,1; \
1355 sth r12,PACA_IN_MCE(r13); \
1356 REST_GPR(11, r1); \
1357 REST_2GPRS(12, r1); \
1358 /* restore original r1. */ \
1359 ld r1,GPR1(r1)
1360
1361 /*
1362 * Handle machine check early in real mode. We come here with
1363 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack.
1364 */
1365 .align 7
1366 .globl machine_check_handle_early
1367 machine_check_handle_early:
1368 std r0,GPR0(r1) /* Save r0 */
1369 EXCEPTION_PROLOG_COMMON_3(0x200)
1370 bl save_nvgprs
1371 addi r3,r1,STACK_FRAME_OVERHEAD
1372 bl machine_check_early
1373 std r3,RESULT(r1) /* Save result */
1374 ld r12,_MSR(r1)
1375 #ifdef CONFIG_PPC_P7_NAP
1376 /*
1377 * Check if thread was in power saving mode. We come here when any
1378 * of the following is true:
1379 * a. thread wasn't in power saving mode
1380 * b. thread was in power saving mode with no state loss or
1381 * supervisor state loss
1382 *
1383 * Go back to nap again if (b) is true.
1384 */
1385 rlwinm. r11,r12,47-31,30,31 /* Was it in power saving mode? */
1386 beq 4f /* No, it wasn;t */
1387 /* Thread was in power saving mode. Go back to nap again. */
1388 cmpwi r11,2
1389 bne 3f
1390 /* Supervisor state loss */
1391 li r0,1
1392 stb r0,PACA_NAPSTATELOST(r13)
1393 3: bl machine_check_queue_event
1394 MACHINE_CHECK_HANDLER_WINDUP
1395 GET_PACA(r13)
1396 ld r1,PACAR1(r13)
1397 li r3,PNV_THREAD_NAP
1398 b power7_enter_nap_mode
1399 4:
1400 #endif
1401 /*
1402 * Check if we are coming from hypervisor userspace. If yes then we
1403 * continue in host kernel in V mode to deliver the MC event.
1404 */
1405 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */
1406 beq 5f
1407 andi. r11,r12,MSR_PR /* See if coming from user. */
1408 bne 9f /* continue in V mode if we are. */
1409
1410 5:
1411 #ifdef CONFIG_KVM_BOOK3S_64_HV
1412 /*
1413 * We are coming from kernel context. Check if we are coming from
1414 * guest. if yes, then we can continue. We will fall through
1415 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest.
1416 */
1417 lbz r11,HSTATE_IN_GUEST(r13)
1418 cmpwi r11,0 /* Check if coming from guest */
1419 bne 9f /* continue if we are. */
1420 #endif
1421 /*
1422 * At this point we are not sure about what context we come from.
1423 * Queue up the MCE event and return from the interrupt.
1424 * But before that, check if this is an un-recoverable exception.
1425 * If yes, then stay on emergency stack and panic.
1426 */
1427 andi. r11,r12,MSR_RI
1428 bne 2f
1429 1: mfspr r11,SPRN_SRR0
1430 ld r10,PACAKBASE(r13)
1431 LOAD_HANDLER(r10,unrecover_mce)
1432 mtspr SPRN_SRR0,r10
1433 ld r10,PACAKMSR(r13)
1434 /*
1435 * We are going down. But there are chances that we might get hit by
1436 * another MCE during panic path and we may run into unstable state
1437 * with no way out. Hence, turn ME bit off while going down, so that
1438 * when another MCE is hit during panic path, system will checkstop
1439 * and hypervisor will get restarted cleanly by SP.
1440 */
1441 li r3,MSR_ME
1442 andc r10,r10,r3 /* Turn off MSR_ME */
1443 mtspr SPRN_SRR1,r10
1444 rfid
1445 b .
1446 2:
1447 /*
1448 * Check if we have successfully handled/recovered from error, if not
1449 * then stay on emergency stack and panic.
1450 */
1451 ld r3,RESULT(r1) /* Load result */
1452 cmpdi r3,0 /* see if we handled MCE successfully */
1453
1454 beq 1b /* if !handled then panic */
1455 /*
1456 * Return from MC interrupt.
1457 * Queue up the MCE event so that we can log it later, while
1458 * returning from kernel or opal call.
1459 */
1460 bl machine_check_queue_event
1461 MACHINE_CHECK_HANDLER_WINDUP
1462 rfid
1463 9:
1464 /* Deliver the machine check to host kernel in V mode. */
1465 MACHINE_CHECK_HANDLER_WINDUP
1466 b machine_check_pSeries
1467
1468 unrecover_mce:
1469 /* Invoke machine_check_exception to print MCE event and panic. */
1470 addi r3,r1,STACK_FRAME_OVERHEAD
1471 bl machine_check_exception
1472 /*
1473 * We will not reach here. Even if we did, there is no way out. Call
1474 * unrecoverable_exception and die.
1475 */
1476 1: addi r3,r1,STACK_FRAME_OVERHEAD
1477 bl unrecoverable_exception
1478 b 1b
1479 /*
1480 * r13 points to the PACA, r9 contains the saved CR,
1481 * r12 contain the saved SRR1, SRR0 is still ready for return
1482 * r3 has the faulting address
1483 * r9 - r13 are saved in paca->exslb.
1484 * r3 is saved in paca->slb_r3
1485 * We assume we aren't going to take any exceptions during this procedure.
1486 */
1487 slb_miss_realmode:
1488 mflr r10
1489 #ifdef CONFIG_RELOCATABLE
1490 mtctr r11
1491 #endif
1492
1493 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1494 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
1495
1496 bl slb_allocate_realmode
1497
1498 /* All done -- return from exception. */
1499
1500 ld r10,PACA_EXSLB+EX_LR(r13)
1501 ld r3,PACA_EXSLB+EX_R3(r13)
1502 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1503
1504 mtlr r10
1505
1506 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1507 beq- 2f
1508
1509 .machine push
1510 .machine "power4"
1511 mtcrf 0x80,r9
1512 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
1513 .machine pop
1514
1515 RESTORE_PPR_PACA(PACA_EXSLB, r9)
1516 ld r9,PACA_EXSLB+EX_R9(r13)
1517 ld r10,PACA_EXSLB+EX_R10(r13)
1518 ld r11,PACA_EXSLB+EX_R11(r13)
1519 ld r12,PACA_EXSLB+EX_R12(r13)
1520 ld r13,PACA_EXSLB+EX_R13(r13)
1521 rfid
1522 b . /* prevent speculative execution */
1523
1524 2: mfspr r11,SPRN_SRR0
1525 ld r10,PACAKBASE(r13)
1526 LOAD_HANDLER(r10,unrecov_slb)
1527 mtspr SPRN_SRR0,r10
1528 ld r10,PACAKMSR(r13)
1529 mtspr SPRN_SRR1,r10
1530 rfid
1531 b .
1532
1533 unrecov_slb:
1534 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1535 RECONCILE_IRQ_STATE(r10, r11)
1536 bl save_nvgprs
1537 1: addi r3,r1,STACK_FRAME_OVERHEAD
1538 bl unrecoverable_exception
1539 b 1b
1540
1541
1542 #ifdef CONFIG_PPC_970_NAP
1543 power4_fixup_nap:
1544 andc r9,r9,r10
1545 std r9,TI_LOCAL_FLAGS(r11)
1546 ld r10,_LINK(r1) /* make idle task do the */
1547 std r10,_NIP(r1) /* equivalent of a blr */
1548 blr
1549 #endif
1550
1551 /*
1552 * Hash table stuff
1553 */
1554 .align 7
1555 do_hash_page:
1556 std r3,_DAR(r1)
1557 std r4,_DSISR(r1)
1558
1559 andis. r0,r4,0xa410 /* weird error? */
1560 bne- handle_page_fault /* if not, try to insert a HPTE */
1561 andis. r0,r4,DSISR_DABRMATCH@h
1562 bne- handle_dabr_fault
1563 CURRENT_THREAD_INFO(r11, r1)
1564 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
1565 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
1566 bne 77f /* then don't call hash_page now */
1567 /*
1568 * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1569 * accessing a userspace segment (even from the kernel). We assume
1570 * kernel addresses always have the high bit set.
1571 */
1572 rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1573 rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
1574 orc r0,r12,r0 /* MSR_PR | ~high_bit */
1575 rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
1576 ori r4,r4,1 /* add _PAGE_PRESENT */
1577 rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
1578
1579 /*
1580 * r3 contains the faulting address
1581 * r4 contains the required access permissions
1582 * r5 contains the trap number
1583 * r6 contains dsisr
1584 *
1585 * at return r3 = 0 for success, 1 for page fault, negative for error
1586 */
1587 ld r6,_DSISR(r1)
1588 bl hash_page /* build HPTE if possible */
1589 cmpdi r3,0 /* see if hash_page succeeded */
1590
1591 /* Success */
1592 beq fast_exc_return_irq /* Return from exception on success */
1593
1594 /* Error */
1595 blt- 13f
1596
1597 /* Here we have a page fault that hash_page can't handle. */
1598 handle_page_fault:
1599 11: ld r4,_DAR(r1)
1600 ld r5,_DSISR(r1)
1601 addi r3,r1,STACK_FRAME_OVERHEAD
1602 bl do_page_fault
1603 cmpdi r3,0
1604 beq+ 12f
1605 bl save_nvgprs
1606 mr r5,r3
1607 addi r3,r1,STACK_FRAME_OVERHEAD
1608 lwz r4,_DAR(r1)
1609 bl bad_page_fault
1610 b ret_from_except
1611
1612 /* We have a data breakpoint exception - handle it */
1613 handle_dabr_fault:
1614 bl save_nvgprs
1615 ld r4,_DAR(r1)
1616 ld r5,_DSISR(r1)
1617 addi r3,r1,STACK_FRAME_OVERHEAD
1618 bl do_break
1619 12: b ret_from_except_lite
1620
1621
1622 /* We have a page fault that hash_page could handle but HV refused
1623 * the PTE insertion
1624 */
1625 13: bl save_nvgprs
1626 mr r5,r3
1627 addi r3,r1,STACK_FRAME_OVERHEAD
1628 ld r4,_DAR(r1)
1629 bl low_hash_fault
1630 b ret_from_except
1631
1632 /*
1633 * We come here as a result of a DSI at a point where we don't want
1634 * to call hash_page, such as when we are accessing memory (possibly
1635 * user memory) inside a PMU interrupt that occurred while interrupts
1636 * were soft-disabled. We want to invoke the exception handler for
1637 * the access, or panic if there isn't a handler.
1638 */
1639 77: bl save_nvgprs
1640 mr r4,r3
1641 addi r3,r1,STACK_FRAME_OVERHEAD
1642 li r5,SIGSEGV
1643 bl bad_page_fault
1644 b ret_from_except
1645
1646 /*
1647 * Here we have detected that the kernel stack pointer is bad.
1648 * R9 contains the saved CR, r13 points to the paca,
1649 * r10 contains the (bad) kernel stack pointer,
1650 * r11 and r12 contain the saved SRR0 and SRR1.
1651 * We switch to using an emergency stack, save the registers there,
1652 * and call kernel_bad_stack(), which panics.
1653 */
1654 bad_stack:
1655 ld r1,PACAEMERGSP(r13)
1656 subi r1,r1,64+INT_FRAME_SIZE
1657 std r9,_CCR(r1)
1658 std r10,GPR1(r1)
1659 std r11,_NIP(r1)
1660 std r12,_MSR(r1)
1661 mfspr r11,SPRN_DAR
1662 mfspr r12,SPRN_DSISR
1663 std r11,_DAR(r1)
1664 std r12,_DSISR(r1)
1665 mflr r10
1666 mfctr r11
1667 mfxer r12
1668 std r10,_LINK(r1)
1669 std r11,_CTR(r1)
1670 std r12,_XER(r1)
1671 SAVE_GPR(0,r1)
1672 SAVE_GPR(2,r1)
1673 ld r10,EX_R3(r3)
1674 std r10,GPR3(r1)
1675 SAVE_GPR(4,r1)
1676 SAVE_4GPRS(5,r1)
1677 ld r9,EX_R9(r3)
1678 ld r10,EX_R10(r3)
1679 SAVE_2GPRS(9,r1)
1680 ld r9,EX_R11(r3)
1681 ld r10,EX_R12(r3)
1682 ld r11,EX_R13(r3)
1683 std r9,GPR11(r1)
1684 std r10,GPR12(r1)
1685 std r11,GPR13(r1)
1686 BEGIN_FTR_SECTION
1687 ld r10,EX_CFAR(r3)
1688 std r10,ORIG_GPR3(r1)
1689 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1690 SAVE_8GPRS(14,r1)
1691 SAVE_10GPRS(22,r1)
1692 lhz r12,PACA_TRAP_SAVE(r13)
1693 std r12,_TRAP(r1)
1694 addi r11,r1,INT_FRAME_SIZE
1695 std r11,0(r1)
1696 li r12,0
1697 std r12,0(r11)
1698 ld r2,PACATOC(r13)
1699 ld r11,exception_marker@toc(r2)
1700 std r12,RESULT(r1)
1701 std r11,STACK_FRAME_OVERHEAD-16(r1)
1702 1: addi r3,r1,STACK_FRAME_OVERHEAD
1703 bl kernel_bad_stack
1704 b 1b
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