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.
7 * This file is meant to be #included from head_64.S due to
8 * position dependent assembly.
10 * Most of this originates from head_64.S and thus has the same
15 #include <asm/hw_irq.h>
16 #include <asm/exception-64s.h>
17 #include <asm/ptrace.h>
20 * We layout physical memory as follows:
21 * 0x0000 - 0x00ff : Secondary processor spin code
22 * 0x0100 - 0x17ff : pSeries Interrupt prologs
23 * 0x1800 - 0x4000 : interrupt support common interrupt prologs
24 * 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1
25 * 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1
26 * 0x7000 - 0x7fff : FWNMI data area
27 * 0x8000 - 0x8fff : Initial (CPU0) segment table
28 * 0x9000 - : Early init and support code
30 /* Syscall routine is used twice, in reloc-off and reloc-on paths */
31 #define SYSCALL_PSERIES_1 \
35 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
38 mfspr r11,SPRN_SRR0 ; \
41 #define SYSCALL_PSERIES_2_RFID \
42 mfspr r12,SPRN_SRR1 ; \
43 ld r10,PACAKBASE(r13) ; \
44 LOAD_HANDLER(r10, system_call_entry) ; \
45 mtspr SPRN_SRR0,r10 ; \
46 ld r10,PACAKMSR(r13) ; \
47 mtspr SPRN_SRR1,r10 ; \
49 b . ; /* prevent speculative execution */
51 #define SYSCALL_PSERIES_3 \
52 /* Fast LE/BE switch system call */ \
53 1: mfspr r12,SPRN_SRR1 ; \
54 xori r12,r12,MSR_LE ; \
55 mtspr SPRN_SRR1,r12 ; \
56 rfid ; /* return to userspace */ \
57 b . ; /* prevent speculative execution */
59 #if defined(CONFIG_RELOCATABLE)
61 * We can't branch directly; in the direct case we use LR
62 * and system_call_entry restores LR. (We thus need to move
63 * LR to r10 in the RFID case too.)
65 #define SYSCALL_PSERIES_2_DIRECT \
67 ld r12,PACAKBASE(r13) ; \
68 LOAD_HANDLER(r12, system_call_entry_direct) ; \
70 mfspr r12,SPRN_SRR1 ; \
71 /* Re-use of r13... No spare regs to do this */ \
74 GET_PACA(r13) ; /* get r13 back */ \
77 /* We can branch directly */
78 #define SYSCALL_PSERIES_2_DIRECT \
79 mfspr r12,SPRN_SRR1 ; \
81 mtmsrd r10,1 ; /* Set RI (EE=0) */ \
82 b system_call_entry_direct ;
86 * This is the start of the interrupt handlers for pSeries
87 * This code runs with relocation off.
88 * Code from here to __end_interrupts gets copied down to real
89 * address 0x100 when we are running a relocatable kernel.
90 * Therefore any relative branches in this section must only
91 * branch to labels in this section.
94 .globl __start_interrupts
97 .globl system_reset_pSeries;
99 HMT_MEDIUM_PPR_DISCARD
101 #ifdef CONFIG_PPC_P7_NAP
103 /* Running native on arch 2.06 or later, check if we are
104 * waking up from nap. We only handle no state loss and
105 * supervisor state loss. We do -not- handle hypervisor
106 * state loss at this time.
109 rlwinm. r13,r13,47-31,30,31
112 /* waking up from powersave (nap) state */
114 /* Total loss of HV state is fatal, we could try to use the
115 * PIR to locate a PACA, then use an emergency stack etc...
116 * OPAL v3 based powernv platforms have new idle states
117 * which fall in this catagory.
122 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
123 li r0,KVM_HWTHREAD_IN_KERNEL
124 stb r0,HSTATE_HWTHREAD_STATE(r13)
125 /* Order setting hwthread_state vs. testing hwthread_req */
127 lbz r0,HSTATE_HWTHREAD_REQ(r13)
134 /* Return SRR1 from power7_nap() */
137 b power7_wakeup_noloss
138 2: b power7_wakeup_loss
140 /* Fast Sleep wakeup on PowerNV */
142 b power7_wakeup_tb_loss
145 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
146 #endif /* CONFIG_PPC_P7_NAP */
147 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
151 machine_check_pSeries_1:
152 /* This is moved out of line as it can be patched by FW, but
153 * some code path might still want to branch into the original
156 HMT_MEDIUM_PPR_DISCARD
157 SET_SCRATCH0(r13) /* save r13 */
158 #ifdef CONFIG_PPC_P7_NAP
160 /* Running native on arch 2.06 or later, check if we are
161 * waking up from nap. We only handle no state loss and
162 * supervisor state loss. We do -not- handle hypervisor
163 * state loss at this time.
166 rlwinm. r13,r13,47-31,30,31
167 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
171 rlwinm. r13,r13,47-31,30,31
172 /* waking up from powersave (nap) state */
174 /* Total loss of HV state is fatal. let's just stay stuck here */
175 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
178 OPT_SET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
179 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
180 #endif /* CONFIG_PPC_P7_NAP */
181 EXCEPTION_PROLOG_0(PACA_EXMC)
183 b machine_check_pSeries_early
185 b machine_check_pSeries_0
186 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
189 .globl data_access_pSeries
191 HMT_MEDIUM_PPR_DISCARD
193 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
197 .globl data_access_slb_pSeries
198 data_access_slb_pSeries:
199 HMT_MEDIUM_PPR_DISCARD
201 EXCEPTION_PROLOG_0(PACA_EXSLB)
202 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
203 std r3,PACA_EXSLB+EX_R3(r13)
206 /* Keep that around for when we re-implement dynamic VSIDs */
208 bge slb_miss_user_pseries
209 #endif /* __DISABLED__ */
211 #ifndef CONFIG_RELOCATABLE
215 * We can't just use a direct branch to slb_miss_realmode
216 * because the distance from here to there depends on where
217 * the kernel ends up being put.
220 ld r10,PACAKBASE(r13)
221 LOAD_HANDLER(r10, slb_miss_realmode)
226 STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
229 .globl instruction_access_slb_pSeries
230 instruction_access_slb_pSeries:
231 HMT_MEDIUM_PPR_DISCARD
233 EXCEPTION_PROLOG_0(PACA_EXSLB)
234 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
235 std r3,PACA_EXSLB+EX_R3(r13)
236 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
238 /* Keep that around for when we re-implement dynamic VSIDs */
240 bge slb_miss_user_pseries
241 #endif /* __DISABLED__ */
243 #ifndef CONFIG_RELOCATABLE
247 ld r10,PACAKBASE(r13)
248 LOAD_HANDLER(r10, slb_miss_realmode)
253 /* We open code these as we can't have a ". = x" (even with
254 * x = "." within a feature section
257 .globl hardware_interrupt_pSeries;
258 .globl hardware_interrupt_hv;
259 hardware_interrupt_pSeries:
260 hardware_interrupt_hv:
261 HMT_MEDIUM_PPR_DISCARD
263 _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
264 EXC_HV, SOFTEN_TEST_HV)
265 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
267 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
268 EXC_STD, SOFTEN_TEST_HV_201)
269 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
270 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
272 STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
273 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
275 STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
276 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
278 STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
279 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
282 .globl decrementer_pSeries
284 _MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR)
286 STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
288 MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
289 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
291 STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
292 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
295 .globl system_call_pSeries
298 * If CONFIG_KVM_BOOK3S_64_HANDLER is set, save the PPR (on systems
299 * that support it) before changing to HMT_MEDIUM. That allows the KVM
300 * code to save that value into the guest state (it is the guest's PPR
301 * value). Otherwise just change to HMT_MEDIUM as userspace has
302 * already saved the PPR.
304 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
307 std r9,PACA_EXGEN+EX_R9(r13)
308 OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);
310 std r10,PACA_EXGEN+EX_R10(r13)
311 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r9, CPU_FTR_HAS_PPR);
319 SYSCALL_PSERIES_2_RFID
321 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
323 STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
324 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
326 /* At 0xe??? we have a bunch of hypervisor exceptions, we branch
327 * out of line to handle them
330 hv_data_storage_trampoline:
332 EXCEPTION_PROLOG_0(PACA_EXGEN)
336 hv_instr_storage_trampoline:
338 EXCEPTION_PROLOG_0(PACA_EXGEN)
342 emulation_assist_trampoline:
344 EXCEPTION_PROLOG_0(PACA_EXGEN)
345 b emulation_assist_hv
348 hv_exception_trampoline:
350 EXCEPTION_PROLOG_0(PACA_EXGEN)
351 b hmi_exception_early
354 hv_doorbell_trampoline:
356 EXCEPTION_PROLOG_0(PACA_EXGEN)
359 /* We need to deal with the Altivec unavailable exception
360 * here which is at 0xf20, thus in the middle of the
361 * prolog code of the PerformanceMonitor one. A little
362 * trickery is thus necessary
365 performance_monitor_pseries_trampoline:
367 EXCEPTION_PROLOG_0(PACA_EXGEN)
368 b performance_monitor_pSeries
371 altivec_unavailable_pseries_trampoline:
373 EXCEPTION_PROLOG_0(PACA_EXGEN)
374 b altivec_unavailable_pSeries
377 vsx_unavailable_pseries_trampoline:
379 EXCEPTION_PROLOG_0(PACA_EXGEN)
380 b vsx_unavailable_pSeries
383 facility_unavailable_trampoline:
385 EXCEPTION_PROLOG_0(PACA_EXGEN)
386 b facility_unavailable_pSeries
389 hv_facility_unavailable_trampoline:
391 EXCEPTION_PROLOG_0(PACA_EXGEN)
392 b facility_unavailable_hv
394 #ifdef CONFIG_CBE_RAS
395 STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
396 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
397 #endif /* CONFIG_CBE_RAS */
399 STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
400 KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
403 .global denorm_exception_hv
405 HMT_MEDIUM_PPR_DISCARD
406 mtspr SPRN_SPRG_HSCRATCH0,r13
407 EXCEPTION_PROLOG_0(PACA_EXGEN)
408 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
410 #ifdef CONFIG_PPC_DENORMALISATION
412 mfspr r11,SPRN_HSRR0 /* save HSRR0 */
413 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
414 addi r11,r11,-4 /* HSRR0 is next instruction */
419 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
420 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500)
422 #ifdef CONFIG_CBE_RAS
423 STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
424 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
425 #endif /* CONFIG_CBE_RAS */
427 STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
428 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
430 #ifdef CONFIG_CBE_RAS
431 STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
432 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
435 #endif /* CONFIG_CBE_RAS */
438 /*** Out of line interrupts support ***/
441 /* moved from 0x200 */
442 machine_check_pSeries_early:
444 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
449 * Original R9 to R13 is saved on PACA_EXMC
451 * Switch to mc_emergency stack and handle re-entrancy (we limit
452 * the nested MCE upto level 4 to avoid stack overflow).
453 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1
455 * We use paca->in_mce to check whether this is the first entry or
456 * nested machine check. We increment paca->in_mce to track nested
459 * If this is the first entry then set stack pointer to
460 * paca->mc_emergency_sp, otherwise r1 is already pointing to
461 * stack frame on mc_emergency stack.
463 * NOTE: We are here with MSR_ME=0 (off), which means we risk a
464 * checkstop if we get another machine check exception before we do
465 * rfid with MSR_ME=1.
467 mr r11,r1 /* Save r1 */
468 lhz r10,PACA_IN_MCE(r13)
469 cmpwi r10,0 /* Are we in nested machine check */
470 bne 0f /* Yes, we are. */
471 /* First machine check entry */
472 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
473 0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
474 addi r10,r10,1 /* increment paca->in_mce */
475 sth r10,PACA_IN_MCE(r13)
476 /* Limit nested MCE to level 4 to avoid stack overflow */
478 bgt 2f /* Check if we hit limit of 4 */
479 std r11,GPR1(r1) /* Save r1 on the stack. */
480 std r11,0(r1) /* make stack chain pointer */
481 mfspr r11,SPRN_SRR0 /* Save SRR0 */
483 mfspr r11,SPRN_SRR1 /* Save SRR1 */
485 mfspr r11,SPRN_DAR /* Save DAR */
487 mfspr r11,SPRN_DSISR /* Save DSISR */
489 std r9,_CCR(r1) /* Save CR in stackframe */
490 /* Save r9 through r13 from EXMC save area to stack frame. */
491 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC)
492 mfmsr r11 /* get MSR value */
493 ori r11,r11,MSR_ME /* turn on ME bit */
494 ori r11,r11,MSR_RI /* turn on RI bit */
495 ld r12,PACAKBASE(r13) /* get high part of &label */
496 LOAD_HANDLER(r12, machine_check_handle_early)
497 1: mtspr SPRN_SRR0,r12
500 b . /* prevent speculative execution */
502 /* Stack overflow. Stay on emergency stack and panic.
503 * Keep the ME bit off while panic-ing, so that if we hit
504 * another machine check we checkstop.
506 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */
508 ld r12,PACAKBASE(r13)
509 LOAD_HANDLER(r12, unrecover_mce)
511 andc r11,r11,r10 /* Turn off MSR_ME */
513 b . /* prevent speculative execution */
514 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
516 machine_check_pSeries:
517 .globl machine_check_fwnmi
519 HMT_MEDIUM_PPR_DISCARD
520 SET_SCRATCH0(r13) /* save r13 */
521 EXCEPTION_PROLOG_0(PACA_EXMC)
522 machine_check_pSeries_0:
523 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200)
524 EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD)
525 KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
526 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
527 KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
528 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400)
529 KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480)
530 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900)
531 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
533 #ifdef CONFIG_PPC_DENORMALISATION
537 * To denormalise we need to move a copy of the register to itself.
538 * For POWER6 do that here for all FP regs.
541 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
542 xori r10,r10,(MSR_FE0|MSR_FE1)
546 #define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
547 #define FMR4(n) FMR2(n) ; FMR2(n+2)
548 #define FMR8(n) FMR4(n) ; FMR4(n+4)
549 #define FMR16(n) FMR8(n) ; FMR8(n+8)
550 #define FMR32(n) FMR16(n) ; FMR16(n+16)
555 * To denormalise we need to move a copy of the register to itself.
556 * For POWER7 do that here for the first 32 VSX registers only.
559 oris r10,r10,MSR_VSX@h
563 #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
564 #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
565 #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
566 #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
567 #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
570 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
574 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
576 * To denormalise we need to move a copy of the register to itself.
577 * For POWER8 we need to do that for all 64 VSX registers
583 ld r9,PACA_EXGEN+EX_R9(r13)
584 RESTORE_PPR_PACA(PACA_EXGEN, r10)
586 ld r10,PACA_EXGEN+EX_CFAR(r13)
588 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
589 ld r10,PACA_EXGEN+EX_R10(r13)
590 ld r11,PACA_EXGEN+EX_R11(r13)
591 ld r12,PACA_EXGEN+EX_R12(r13)
592 ld r13,PACA_EXGEN+EX_R13(r13)
598 /* moved from 0xe00 */
599 STD_EXCEPTION_HV_OOL(0xe02, h_data_storage)
600 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
601 STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage)
602 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
603 STD_EXCEPTION_HV_OOL(0xe42, emulation_assist)
604 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
605 MASKABLE_EXCEPTION_HV_OOL(0xe62, hmi_exception)
606 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
608 MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell)
609 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
611 /* moved from 0xf00 */
612 STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
613 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00)
614 STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
615 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20)
616 STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
617 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
618 STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
619 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60)
620 STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable)
621 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82)
624 * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
625 * - If it was a decrementer interrupt, we bump the dec to max and and return.
626 * - If it was a doorbell we return immediately since doorbells are edge
627 * triggered and won't automatically refire.
628 * - If it was a HMI we return immediately since we handled it in realmode
629 * and it won't refire.
630 * - else we hard disable and return.
631 * This is called with r10 containing the value to OR to the paca field.
633 #define MASKED_INTERRUPT(_H) \
634 masked_##_H##interrupt: \
635 std r11,PACA_EXGEN+EX_R11(r13); \
636 lbz r11,PACAIRQHAPPENED(r13); \
638 stb r11,PACAIRQHAPPENED(r13); \
639 cmpwi r10,PACA_IRQ_DEC; \
642 ori r10,r10,0xffff; \
643 mtspr SPRN_DEC,r10; \
645 1: cmpwi r10,PACA_IRQ_DBELL; \
647 cmpwi r10,PACA_IRQ_HMI; \
649 mfspr r10,SPRN_##_H##SRR1; \
650 rldicl r10,r10,48,1; /* clear MSR_EE */ \
652 mtspr SPRN_##_H##SRR1,r10; \
654 ld r9,PACA_EXGEN+EX_R9(r13); \
655 ld r10,PACA_EXGEN+EX_R10(r13); \
656 ld r11,PACA_EXGEN+EX_R11(r13); \
665 * Called from arch_local_irq_enable when an interrupt needs
666 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
667 * which kind of interrupt. MSR:EE is already off. We generate a
668 * stackframe like if a real interrupt had happened.
670 * Note: While MSR:EE is off, we need to make sure that _MSR
671 * in the generated frame has EE set to 1 or the exception
672 * handler will not properly re-enable them.
674 _GLOBAL(__replay_interrupt)
675 /* We are going to jump to the exception common code which
676 * will retrieve various register values from the PACA which
677 * we don't give a damn about, so we don't bother storing them.
684 beq decrementer_common
686 beq hardware_interrupt_common
689 beq h_doorbell_common
692 beq doorbell_super_common
693 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
696 #ifdef CONFIG_PPC_PSERIES
698 * Vectors for the FWNMI option. Share common code.
700 .globl system_reset_fwnmi
703 HMT_MEDIUM_PPR_DISCARD
704 SET_SCRATCH0(r13) /* save r13 */
705 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
708 #endif /* CONFIG_PPC_PSERIES */
712 * This is used for when the SLB miss handler has to go virtual,
713 * which doesn't happen for now anymore but will once we re-implement
714 * dynamic VSIDs for shared page tables
716 slb_miss_user_pseries:
717 std r10,PACA_EXGEN+EX_R10(r13)
718 std r11,PACA_EXGEN+EX_R11(r13)
719 std r12,PACA_EXGEN+EX_R12(r13)
721 ld r11,PACA_EXSLB+EX_R9(r13)
722 ld r12,PACA_EXSLB+EX_R3(r13)
723 std r10,PACA_EXGEN+EX_R13(r13)
724 std r11,PACA_EXGEN+EX_R9(r13)
725 std r12,PACA_EXGEN+EX_R3(r13)
728 mfspr r11,SRR0 /* save SRR0 */
729 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
730 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
732 mfspr r12,SRR1 /* and SRR1 */
735 b . /* prevent spec. execution */
736 #endif /* __DISABLED__ */
738 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
739 kvmppc_skip_interrupt:
741 * Here all GPRs are unchanged from when the interrupt happened
742 * except for r13, which is saved in SPRG_SCRATCH0.
751 kvmppc_skip_Hinterrupt:
753 * Here all GPRs are unchanged from when the interrupt happened
754 * except for r13, which is saved in SPRG_SCRATCH0.
756 mfspr r13, SPRN_HSRR0
758 mtspr SPRN_HSRR0, r13
765 * Code from here down to __end_handlers is invoked from the
766 * exception prologs above. Because the prologs assemble the
767 * addresses of these handlers using the LOAD_HANDLER macro,
768 * which uses an ori instruction, these handlers must be in
769 * the first 64k of the kernel image.
772 /*** Common interrupt handlers ***/
774 STD_EXCEPTION_COMMON(0x100, system_reset, system_reset_exception)
776 STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
777 STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, timer_interrupt)
778 STD_EXCEPTION_COMMON(0x980, hdecrementer, hdec_interrupt)
779 #ifdef CONFIG_PPC_DOORBELL
780 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, doorbell_exception)
782 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, unknown_exception)
784 STD_EXCEPTION_COMMON(0xb00, trap_0b, unknown_exception)
785 STD_EXCEPTION_COMMON(0xd00, single_step, single_step_exception)
786 STD_EXCEPTION_COMMON(0xe00, trap_0e, unknown_exception)
787 STD_EXCEPTION_COMMON(0xe40, emulation_assist, emulation_assist_interrupt)
788 STD_EXCEPTION_COMMON_ASYNC(0xe60, hmi_exception, handle_hmi_exception)
789 #ifdef CONFIG_PPC_DOORBELL
790 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, doorbell_exception)
792 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, unknown_exception)
794 STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, performance_monitor_exception)
795 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, instruction_breakpoint_exception)
796 STD_EXCEPTION_COMMON(0x1502, denorm, unknown_exception)
797 #ifdef CONFIG_ALTIVEC
798 STD_EXCEPTION_COMMON(0x1700, altivec_assist, altivec_assist_exception)
800 STD_EXCEPTION_COMMON(0x1700, altivec_assist, unknown_exception)
802 #ifdef CONFIG_CBE_RAS
803 STD_EXCEPTION_COMMON(0x1200, cbe_system_error, cbe_system_error_exception)
804 STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, cbe_maintenance_exception)
805 STD_EXCEPTION_COMMON(0x1800, cbe_thermal, cbe_thermal_exception)
806 #endif /* CONFIG_CBE_RAS */
809 * Relocation-on interrupts: A subset of the interrupts can be delivered
810 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
811 * it. Addresses are the same as the original interrupt addresses, but
812 * offset by 0xc000000000004000.
813 * It's impossible to receive interrupts below 0x300 via this mechanism.
814 * KVM: None of these traps are from the guest ; anything that escalated
815 * to HV=1 from HV=0 is delivered via real mode handlers.
819 * This uses the standard macro, since the original 0x300 vector
820 * only has extra guff for STAB-based processors -- which never
823 STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access)
825 .globl data_access_slb_relon_pSeries
826 data_access_slb_relon_pSeries:
828 EXCEPTION_PROLOG_0(PACA_EXSLB)
829 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
830 std r3,PACA_EXSLB+EX_R3(r13)
833 #ifndef CONFIG_RELOCATABLE
837 * We can't just use a direct branch to slb_miss_realmode
838 * because the distance from here to there depends on where
839 * the kernel ends up being put.
842 ld r10,PACAKBASE(r13)
843 LOAD_HANDLER(r10, slb_miss_realmode)
848 STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access)
850 .globl instruction_access_slb_relon_pSeries
851 instruction_access_slb_relon_pSeries:
853 EXCEPTION_PROLOG_0(PACA_EXSLB)
854 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
855 std r3,PACA_EXSLB+EX_R3(r13)
856 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
858 #ifndef CONFIG_RELOCATABLE
862 ld r10,PACAKBASE(r13)
863 LOAD_HANDLER(r10, slb_miss_realmode)
869 .globl hardware_interrupt_relon_pSeries;
870 .globl hardware_interrupt_relon_hv;
871 hardware_interrupt_relon_pSeries:
872 hardware_interrupt_relon_hv:
874 _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
876 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
877 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
878 STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
879 STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
880 STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
881 MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
882 STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
883 MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
884 STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
887 .globl system_call_relon_pSeries
888 system_call_relon_pSeries:
891 SYSCALL_PSERIES_2_DIRECT
894 STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step)
897 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
900 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
903 emulation_assist_relon_trampoline:
905 EXCEPTION_PROLOG_0(PACA_EXGEN)
906 b emulation_assist_relon_hv
909 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
912 h_doorbell_relon_trampoline:
914 EXCEPTION_PROLOG_0(PACA_EXGEN)
915 b h_doorbell_relon_hv
918 performance_monitor_relon_pseries_trampoline:
920 EXCEPTION_PROLOG_0(PACA_EXGEN)
921 b performance_monitor_relon_pSeries
924 altivec_unavailable_relon_pseries_trampoline:
926 EXCEPTION_PROLOG_0(PACA_EXGEN)
927 b altivec_unavailable_relon_pSeries
930 vsx_unavailable_relon_pseries_trampoline:
932 EXCEPTION_PROLOG_0(PACA_EXGEN)
933 b vsx_unavailable_relon_pSeries
936 facility_unavailable_relon_trampoline:
938 EXCEPTION_PROLOG_0(PACA_EXGEN)
939 b facility_unavailable_relon_pSeries
942 hv_facility_unavailable_relon_trampoline:
944 EXCEPTION_PROLOG_0(PACA_EXGEN)
945 b hv_facility_unavailable_relon_hv
947 STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
948 #ifdef CONFIG_PPC_DENORMALISATION
950 b denorm_exception_hv
952 STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist)
954 /* Other future vectors */
956 .globl __end_interrupts
960 system_call_entry_direct:
961 #if defined(CONFIG_RELOCATABLE)
962 /* The first level prologue may have used LR to get here, saving
963 * orig in r10. To save hacking/ifdeffing common code, restore here.
970 ppc64_runlatch_on_trampoline:
971 b __ppc64_runlatch_on
974 * Here r13 points to the paca, r9 contains the saved CR,
975 * SRR0 and SRR1 are saved in r11 and r12,
976 * r9 - r13 are saved in paca->exgen.
979 .globl data_access_common
982 std r10,PACA_EXGEN+EX_DAR(r13)
984 stw r10,PACA_EXGEN+EX_DSISR(r13)
985 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
986 RECONCILE_IRQ_STATE(r10, r11)
988 ld r3,PACA_EXGEN+EX_DAR(r13)
989 lwz r4,PACA_EXGEN+EX_DSISR(r13)
991 b do_hash_page /* Try to handle as hpte fault */
994 .globl h_data_storage_common
995 h_data_storage_common:
997 std r10,PACA_EXGEN+EX_DAR(r13)
998 mfspr r10,SPRN_HDSISR
999 stw r10,PACA_EXGEN+EX_DSISR(r13)
1000 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
1002 RECONCILE_IRQ_STATE(r10, r11)
1003 addi r3,r1,STACK_FRAME_OVERHEAD
1004 bl unknown_exception
1008 .globl instruction_access_common
1009 instruction_access_common:
1010 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
1011 RECONCILE_IRQ_STATE(r10, r11)
1014 andis. r4,r12,0x5820
1016 b do_hash_page /* Try to handle as hpte fault */
1018 STD_EXCEPTION_COMMON(0xe20, h_instr_storage, unknown_exception)
1021 * Here is the common SLB miss user that is used when going to virtual
1022 * mode for SLB misses, that is currently not used
1026 .globl slb_miss_user_common
1027 slb_miss_user_common:
1029 std r3,PACA_EXGEN+EX_DAR(r13)
1030 stw r9,PACA_EXGEN+EX_CCR(r13)
1031 std r10,PACA_EXGEN+EX_LR(r13)
1032 std r11,PACA_EXGEN+EX_SRR0(r13)
1033 bl slb_allocate_user
1035 ld r10,PACA_EXGEN+EX_LR(r13)
1036 ld r3,PACA_EXGEN+EX_R3(r13)
1037 lwz r9,PACA_EXGEN+EX_CCR(r13)
1038 ld r11,PACA_EXGEN+EX_SRR0(r13)
1042 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1043 beq- unrecov_user_slb
1051 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
1057 ld r9,PACA_EXGEN+EX_R9(r13)
1058 ld r10,PACA_EXGEN+EX_R10(r13)
1059 ld r11,PACA_EXGEN+EX_R11(r13)
1060 ld r12,PACA_EXGEN+EX_R12(r13)
1061 ld r13,PACA_EXGEN+EX_R13(r13)
1066 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
1067 ld r4,PACA_EXGEN+EX_DAR(r13)
1074 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
1075 RECONCILE_IRQ_STATE(r10, r11)
1077 1: addi r3,r1,STACK_FRAME_OVERHEAD
1078 bl unrecoverable_exception
1081 #endif /* __DISABLED__ */
1085 * Machine check is different because we use a different
1086 * save area: PACA_EXMC instead of PACA_EXGEN.
1089 .globl machine_check_common
1090 machine_check_common:
1093 std r10,PACA_EXGEN+EX_DAR(r13)
1094 mfspr r10,SPRN_DSISR
1095 stw r10,PACA_EXGEN+EX_DSISR(r13)
1096 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
1098 RECONCILE_IRQ_STATE(r10, r11)
1099 ld r3,PACA_EXGEN+EX_DAR(r13)
1100 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1104 addi r3,r1,STACK_FRAME_OVERHEAD
1105 bl machine_check_exception
1109 .globl alignment_common
1112 std r10,PACA_EXGEN+EX_DAR(r13)
1113 mfspr r10,SPRN_DSISR
1114 stw r10,PACA_EXGEN+EX_DSISR(r13)
1115 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1116 ld r3,PACA_EXGEN+EX_DAR(r13)
1117 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1121 RECONCILE_IRQ_STATE(r10, r11)
1122 addi r3,r1,STACK_FRAME_OVERHEAD
1123 bl alignment_exception
1127 .globl program_check_common
1128 program_check_common:
1129 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1131 RECONCILE_IRQ_STATE(r10, r11)
1132 addi r3,r1,STACK_FRAME_OVERHEAD
1133 bl program_check_exception
1137 .globl fp_unavailable_common
1138 fp_unavailable_common:
1139 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1140 bne 1f /* if from user, just load it up */
1142 RECONCILE_IRQ_STATE(r10, r11)
1143 addi r3,r1,STACK_FRAME_OVERHEAD
1144 bl kernel_fp_unavailable_exception
1147 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1149 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1150 * transaction), go do TM stuff
1152 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1154 END_FTR_SECTION_IFSET(CPU_FTR_TM)
1157 b fast_exception_return
1158 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1159 2: /* User process was in a transaction */
1161 RECONCILE_IRQ_STATE(r10, r11)
1162 addi r3,r1,STACK_FRAME_OVERHEAD
1163 bl fp_unavailable_tm
1167 .globl altivec_unavailable_common
1168 altivec_unavailable_common:
1169 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1170 #ifdef CONFIG_ALTIVEC
1173 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1174 BEGIN_FTR_SECTION_NESTED(69)
1175 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1176 * transaction), go do TM stuff
1178 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1180 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1183 b fast_exception_return
1184 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1185 2: /* User process was in a transaction */
1187 RECONCILE_IRQ_STATE(r10, r11)
1188 addi r3,r1,STACK_FRAME_OVERHEAD
1189 bl altivec_unavailable_tm
1193 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1196 RECONCILE_IRQ_STATE(r10, r11)
1197 addi r3,r1,STACK_FRAME_OVERHEAD
1198 bl altivec_unavailable_exception
1202 .globl vsx_unavailable_common
1203 vsx_unavailable_common:
1204 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
1208 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1209 BEGIN_FTR_SECTION_NESTED(69)
1210 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1211 * transaction), go do TM stuff
1213 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1215 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1218 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1219 2: /* User process was in a transaction */
1221 RECONCILE_IRQ_STATE(r10, r11)
1222 addi r3,r1,STACK_FRAME_OVERHEAD
1223 bl vsx_unavailable_tm
1227 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
1230 RECONCILE_IRQ_STATE(r10, r11)
1231 addi r3,r1,STACK_FRAME_OVERHEAD
1232 bl vsx_unavailable_exception
1235 STD_EXCEPTION_COMMON(0xf60, facility_unavailable, facility_unavailable_exception)
1236 STD_EXCEPTION_COMMON(0xf80, hv_facility_unavailable, facility_unavailable_exception)
1239 .globl __end_handlers
1242 /* Equivalents to the above handlers for relocation-on interrupt vectors */
1243 STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
1244 MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell)
1246 STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
1247 STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
1248 STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
1249 STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
1250 STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_unavailable)
1252 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
1254 * Data area reserved for FWNMI option.
1255 * This address (0x7000) is fixed by the RPA.
1258 .globl fwnmi_data_area
1261 /* pseries and powernv need to keep the whole page from
1262 * 0x7000 to 0x8000 free for use by the firmware
1265 #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1267 .globl hmi_exception_early
1268 hmi_exception_early:
1269 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0xe60)
1270 mr r10,r1 /* Save r1 */
1271 ld r1,PACAEMERGSP(r13) /* Use emergency stack */
1272 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
1273 std r9,_CCR(r1) /* save CR in stackframe */
1274 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
1275 std r11,_NIP(r1) /* save HSRR0 in stackframe */
1276 mfspr r12,SPRN_HSRR1 /* Save SRR1 */
1277 std r12,_MSR(r1) /* save SRR1 in stackframe */
1278 std r10,0(r1) /* make stack chain pointer */
1279 std r0,GPR0(r1) /* save r0 in stackframe */
1280 std r10,GPR1(r1) /* save r1 in stackframe */
1281 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
1282 EXCEPTION_PROLOG_COMMON_3(0xe60)
1283 addi r3,r1,STACK_FRAME_OVERHEAD
1284 bl hmi_exception_realmode
1285 /* Windup the stack. */
1286 /* Move original HSRR0 and HSRR1 into the respective regs */
1304 /* restore original r1. */
1308 * Go to virtual mode and pull the HMI event information from
1311 .globl hmi_exception_after_realmode
1312 hmi_exception_after_realmode:
1314 EXCEPTION_PROLOG_0(PACA_EXGEN)
1318 #define MACHINE_CHECK_HANDLER_WINDUP \
1319 /* Clear MSR_RI before setting SRR0 and SRR1. */\
1321 mfmsr r9; /* get MSR value */ \
1323 mtmsrd r9,1; /* Clear MSR_RI */ \
1324 /* Move original SRR0 and SRR1 into the respective regs */ \
1326 mtspr SPRN_SRR1,r9; \
1328 mtspr SPRN_SRR0,r3; \
1336 REST_8GPRS(2, r1); \
1340 /* Decrement paca->in_mce. */ \
1341 lhz r12,PACA_IN_MCE(r13); \
1343 sth r12,PACA_IN_MCE(r13); \
1345 REST_2GPRS(12, r1); \
1346 /* restore original r1. */ \
1350 * Handle machine check early in real mode. We come here with
1351 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack.
1354 .globl machine_check_handle_early
1355 machine_check_handle_early:
1356 std r0,GPR0(r1) /* Save r0 */
1357 EXCEPTION_PROLOG_COMMON_3(0x200)
1359 addi r3,r1,STACK_FRAME_OVERHEAD
1360 bl machine_check_early
1361 std r3,RESULT(r1) /* Save result */
1363 #ifdef CONFIG_PPC_P7_NAP
1365 * Check if thread was in power saving mode. We come here when any
1366 * of the following is true:
1367 * a. thread wasn't in power saving mode
1368 * b. thread was in power saving mode with no state loss or
1369 * supervisor state loss
1371 * Go back to nap again if (b) is true.
1373 rlwinm. r11,r12,47-31,30,31 /* Was it in power saving mode? */
1374 beq 4f /* No, it wasn;t */
1375 /* Thread was in power saving mode. Go back to nap again. */
1378 /* Supervisor state loss */
1380 stb r0,PACA_NAPSTATELOST(r13)
1381 3: bl machine_check_queue_event
1382 MACHINE_CHECK_HANDLER_WINDUP
1385 b power7_enter_nap_mode
1389 * Check if we are coming from hypervisor userspace. If yes then we
1390 * continue in host kernel in V mode to deliver the MC event.
1392 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */
1394 andi. r11,r12,MSR_PR /* See if coming from user. */
1395 bne 9f /* continue in V mode if we are. */
1398 #ifdef CONFIG_KVM_BOOK3S_64_HV
1400 * We are coming from kernel context. Check if we are coming from
1401 * guest. if yes, then we can continue. We will fall through
1402 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest.
1404 lbz r11,HSTATE_IN_GUEST(r13)
1405 cmpwi r11,0 /* Check if coming from guest */
1406 bne 9f /* continue if we are. */
1409 * At this point we are not sure about what context we come from.
1410 * Queue up the MCE event and return from the interrupt.
1411 * But before that, check if this is an un-recoverable exception.
1412 * If yes, then stay on emergency stack and panic.
1414 andi. r11,r12,MSR_RI
1416 1: mfspr r11,SPRN_SRR0
1417 ld r10,PACAKBASE(r13)
1418 LOAD_HANDLER(r10,unrecover_mce)
1420 ld r10,PACAKMSR(r13)
1422 * We are going down. But there are chances that we might get hit by
1423 * another MCE during panic path and we may run into unstable state
1424 * with no way out. Hence, turn ME bit off while going down, so that
1425 * when another MCE is hit during panic path, system will checkstop
1426 * and hypervisor will get restarted cleanly by SP.
1429 andc r10,r10,r3 /* Turn off MSR_ME */
1435 * Check if we have successfully handled/recovered from error, if not
1436 * then stay on emergency stack and panic.
1438 ld r3,RESULT(r1) /* Load result */
1439 cmpdi r3,0 /* see if we handled MCE successfully */
1441 beq 1b /* if !handled then panic */
1443 * Return from MC interrupt.
1444 * Queue up the MCE event so that we can log it later, while
1445 * returning from kernel or opal call.
1447 bl machine_check_queue_event
1448 MACHINE_CHECK_HANDLER_WINDUP
1451 /* Deliver the machine check to host kernel in V mode. */
1452 MACHINE_CHECK_HANDLER_WINDUP
1453 b machine_check_pSeries
1456 /* Invoke machine_check_exception to print MCE event and panic. */
1457 addi r3,r1,STACK_FRAME_OVERHEAD
1458 bl machine_check_exception
1460 * We will not reach here. Even if we did, there is no way out. Call
1461 * unrecoverable_exception and die.
1463 1: addi r3,r1,STACK_FRAME_OVERHEAD
1464 bl unrecoverable_exception
1467 * r13 points to the PACA, r9 contains the saved CR,
1468 * r12 contain the saved SRR1, SRR0 is still ready for return
1469 * r3 has the faulting address
1470 * r9 - r13 are saved in paca->exslb.
1471 * r3 is saved in paca->slb_r3
1472 * We assume we aren't going to take any exceptions during this procedure.
1476 #ifdef CONFIG_RELOCATABLE
1480 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1481 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
1483 bl slb_allocate_realmode
1485 /* All done -- return from exception. */
1487 ld r10,PACA_EXSLB+EX_LR(r13)
1488 ld r3,PACA_EXSLB+EX_R3(r13)
1489 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1493 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1499 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
1502 RESTORE_PPR_PACA(PACA_EXSLB, r9)
1503 ld r9,PACA_EXSLB+EX_R9(r13)
1504 ld r10,PACA_EXSLB+EX_R10(r13)
1505 ld r11,PACA_EXSLB+EX_R11(r13)
1506 ld r12,PACA_EXSLB+EX_R12(r13)
1507 ld r13,PACA_EXSLB+EX_R13(r13)
1509 b . /* prevent speculative execution */
1511 2: mfspr r11,SPRN_SRR0
1512 ld r10,PACAKBASE(r13)
1513 LOAD_HANDLER(r10,unrecov_slb)
1515 ld r10,PACAKMSR(r13)
1521 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1522 RECONCILE_IRQ_STATE(r10, r11)
1524 1: addi r3,r1,STACK_FRAME_OVERHEAD
1525 bl unrecoverable_exception
1529 #ifdef CONFIG_PPC_970_NAP
1532 std r9,TI_LOCAL_FLAGS(r11)
1533 ld r10,_LINK(r1) /* make idle task do the */
1534 std r10,_NIP(r1) /* equivalent of a blr */
1546 andis. r0,r4,0xa410 /* weird error? */
1547 bne- handle_page_fault /* if not, try to insert a HPTE */
1548 andis. r0,r4,DSISR_DABRMATCH@h
1549 bne- handle_dabr_fault
1550 CURRENT_THREAD_INFO(r11, r1)
1551 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
1552 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
1553 bne 77f /* then don't call hash_page now */
1555 * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1556 * accessing a userspace segment (even from the kernel). We assume
1557 * kernel addresses always have the high bit set.
1559 rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1560 rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
1561 orc r0,r12,r0 /* MSR_PR | ~high_bit */
1562 rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
1563 ori r4,r4,1 /* add _PAGE_PRESENT */
1564 rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
1567 * r3 contains the faulting address
1568 * r4 contains the required access permissions
1569 * r5 contains the trap number
1572 * at return r3 = 0 for success, 1 for page fault, negative for error
1575 bl hash_page /* build HPTE if possible */
1576 cmpdi r3,0 /* see if hash_page succeeded */
1579 beq fast_exc_return_irq /* Return from exception on success */
1584 /* Here we have a page fault that hash_page can't handle. */
1588 addi r3,r1,STACK_FRAME_OVERHEAD
1594 addi r3,r1,STACK_FRAME_OVERHEAD
1599 /* We have a data breakpoint exception - handle it */
1604 addi r3,r1,STACK_FRAME_OVERHEAD
1606 12: b ret_from_except_lite
1609 /* We have a page fault that hash_page could handle but HV refused
1614 addi r3,r1,STACK_FRAME_OVERHEAD
1620 * We come here as a result of a DSI at a point where we don't want
1621 * to call hash_page, such as when we are accessing memory (possibly
1622 * user memory) inside a PMU interrupt that occurred while interrupts
1623 * were soft-disabled. We want to invoke the exception handler for
1624 * the access, or panic if there isn't a handler.
1628 addi r3,r1,STACK_FRAME_OVERHEAD
1634 * Here we have detected that the kernel stack pointer is bad.
1635 * R9 contains the saved CR, r13 points to the paca,
1636 * r10 contains the (bad) kernel stack pointer,
1637 * r11 and r12 contain the saved SRR0 and SRR1.
1638 * We switch to using an emergency stack, save the registers there,
1639 * and call kernel_bad_stack(), which panics.
1642 ld r1,PACAEMERGSP(r13)
1643 subi r1,r1,64+INT_FRAME_SIZE
1649 mfspr r12,SPRN_DSISR
1675 std r10,ORIG_GPR3(r1)
1676 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1679 lhz r12,PACA_TRAP_SAVE(r13)
1681 addi r11,r1,INT_FRAME_SIZE
1686 ld r11,exception_marker@toc(r2)
1688 std r11,STACK_FRAME_OVERHEAD-16(r1)
1689 1: addi r3,r1,STACK_FRAME_OVERHEAD