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>
18 #include <asm/cpuidle.h>
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
31 /* Syscall routine is used twice, in reloc-off and reloc-on paths */
32 #define SYSCALL_PSERIES_1 \
36 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
39 mfspr r11,SPRN_SRR0 ; \
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 ; \
50 b . ; /* prevent speculative execution */
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 */
60 #if defined(CONFIG_RELOCATABLE)
62 * We can't branch directly so we do it via the CTR which
63 * is volatile across system calls.
65 #define SYSCALL_PSERIES_2_DIRECT \
67 ld r12,PACAKBASE(r13) ; \
68 LOAD_HANDLER(r12, system_call_entry) ; \
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_common ;
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;
100 #ifdef CONFIG_PPC_P7_NAP
102 /* Running native on arch 2.06 or later, check if we are
103 * waking up from nap/sleep/winkle.
106 rlwinm. r13,r13,47-31,30,31
111 bl pnv_restore_hyp_resource
113 li r0,PNV_THREAD_RUNNING
114 stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */
116 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
117 li r0,KVM_HWTHREAD_IN_KERNEL
118 stb r0,HSTATE_HWTHREAD_STATE(r13)
119 /* Order setting hwthread_state vs. testing hwthread_req */
121 lbz r0,HSTATE_HWTHREAD_REQ(r13)
128 /* Return SRR1 from power7_nap() */
132 2: b pnv_wakeup_noloss
135 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
136 #endif /* CONFIG_PPC_P7_NAP */
137 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
141 machine_check_pSeries_1:
142 /* This is moved out of line as it can be patched by FW, but
143 * some code path might still want to branch into the original
146 SET_SCRATCH0(r13) /* save r13 */
148 * Running native on arch 2.06 or later, we may wakeup from winkle
149 * inside machine check. If yes, then last bit of HSPGR0 would be set
150 * to 1. Hence clear it unconditionally.
155 EXCEPTION_PROLOG_0(PACA_EXMC)
157 b machine_check_powernv_early
159 b machine_check_pSeries_0
160 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
163 .globl data_access_pSeries
166 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
170 .globl data_access_slb_pSeries
171 data_access_slb_pSeries:
173 EXCEPTION_PROLOG_0(PACA_EXSLB)
174 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
175 std r3,PACA_EXSLB+EX_R3(r13)
178 #ifndef CONFIG_RELOCATABLE
182 * We can't just use a direct branch to slb_miss_realmode
183 * because the distance from here to there depends on where
184 * the kernel ends up being put.
187 ld r10,PACAKBASE(r13)
188 LOAD_HANDLER(r10, slb_miss_realmode)
193 STD_EXCEPTION_PSERIES(0x400, instruction_access)
196 .globl instruction_access_slb_pSeries
197 instruction_access_slb_pSeries:
199 EXCEPTION_PROLOG_0(PACA_EXSLB)
200 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x480)
201 std r3,PACA_EXSLB+EX_R3(r13)
202 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
204 #ifndef CONFIG_RELOCATABLE
208 ld r10,PACAKBASE(r13)
209 LOAD_HANDLER(r10, slb_miss_realmode)
214 /* We open code these as we can't have a ". = x" (even with
215 * x = "." within a feature section
218 .globl hardware_interrupt_pSeries;
219 .globl hardware_interrupt_hv;
220 hardware_interrupt_pSeries:
221 hardware_interrupt_hv:
223 _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
224 EXC_HV, SOFTEN_TEST_HV)
225 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
227 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
228 EXC_STD, SOFTEN_TEST_PR)
229 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
230 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
232 STD_EXCEPTION_PSERIES(0x600, alignment)
233 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x600)
235 STD_EXCEPTION_PSERIES(0x700, program_check)
236 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x700)
238 STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
239 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x800)
242 .globl decrementer_pSeries
244 _MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR)
246 STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
248 MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
249 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xa00)
251 STD_EXCEPTION_PSERIES(0xb00, trap_0b)
252 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xb00)
255 .globl system_call_pSeries
258 * If CONFIG_KVM_BOOK3S_64_HANDLER is set, save the PPR (on systems
259 * that support it) before changing to HMT_MEDIUM. That allows the KVM
260 * code to save that value into the guest state (it is the guest's PPR
261 * value). Otherwise just change to HMT_MEDIUM as userspace has
262 * already saved the PPR.
264 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
267 std r9,PACA_EXGEN+EX_R9(r13)
268 OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);
270 std r10,PACA_EXGEN+EX_R10(r13)
271 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r9, CPU_FTR_HAS_PPR);
279 SYSCALL_PSERIES_2_RFID
281 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
283 STD_EXCEPTION_PSERIES(0xd00, single_step)
284 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xd00)
286 /* At 0xe??? we have a bunch of hypervisor exceptions, we branch
287 * out of line to handle them
290 hv_data_storage_trampoline:
292 EXCEPTION_PROLOG_0(PACA_EXGEN)
296 hv_instr_storage_trampoline:
298 EXCEPTION_PROLOG_0(PACA_EXGEN)
302 emulation_assist_trampoline:
304 EXCEPTION_PROLOG_0(PACA_EXGEN)
305 b emulation_assist_hv
308 hv_exception_trampoline:
310 EXCEPTION_PROLOG_0(PACA_EXGEN)
311 b hmi_exception_early
314 hv_doorbell_trampoline:
316 EXCEPTION_PROLOG_0(PACA_EXGEN)
320 hv_virt_irq_trampoline:
322 EXCEPTION_PROLOG_0(PACA_EXGEN)
325 /* We need to deal with the Altivec unavailable exception
326 * here which is at 0xf20, thus in the middle of the
327 * prolog code of the PerformanceMonitor one. A little
328 * trickery is thus necessary
331 performance_monitor_pseries_trampoline:
333 EXCEPTION_PROLOG_0(PACA_EXGEN)
334 b performance_monitor_pSeries
337 altivec_unavailable_pseries_trampoline:
339 EXCEPTION_PROLOG_0(PACA_EXGEN)
340 b altivec_unavailable_pSeries
343 vsx_unavailable_pseries_trampoline:
345 EXCEPTION_PROLOG_0(PACA_EXGEN)
346 b vsx_unavailable_pSeries
349 facility_unavailable_trampoline:
351 EXCEPTION_PROLOG_0(PACA_EXGEN)
352 b facility_unavailable_pSeries
355 hv_facility_unavailable_trampoline:
357 EXCEPTION_PROLOG_0(PACA_EXGEN)
358 b facility_unavailable_hv
360 #ifdef CONFIG_CBE_RAS
361 STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
362 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
363 #endif /* CONFIG_CBE_RAS */
365 STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
366 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
369 .global denorm_exception_hv
371 mtspr SPRN_SPRG_HSCRATCH0,r13
372 EXCEPTION_PROLOG_0(PACA_EXGEN)
373 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
375 #ifdef CONFIG_PPC_DENORMALISATION
377 mfspr r11,SPRN_HSRR0 /* save HSRR0 */
378 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
379 addi r11,r11,-4 /* HSRR0 is next instruction */
384 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
385 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500)
387 #ifdef CONFIG_CBE_RAS
388 STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
389 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
390 #endif /* CONFIG_CBE_RAS */
392 STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
393 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x1700)
395 #ifdef CONFIG_CBE_RAS
396 STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
397 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
400 #endif /* CONFIG_CBE_RAS */
403 /*** Out of line interrupts support ***/
406 /* moved from 0x200 */
407 machine_check_powernv_early:
409 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
414 * Original R9 to R13 is saved on PACA_EXMC
416 * Switch to mc_emergency stack and handle re-entrancy (we limit
417 * the nested MCE upto level 4 to avoid stack overflow).
418 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1
420 * We use paca->in_mce to check whether this is the first entry or
421 * nested machine check. We increment paca->in_mce to track nested
424 * If this is the first entry then set stack pointer to
425 * paca->mc_emergency_sp, otherwise r1 is already pointing to
426 * stack frame on mc_emergency stack.
428 * NOTE: We are here with MSR_ME=0 (off), which means we risk a
429 * checkstop if we get another machine check exception before we do
430 * rfid with MSR_ME=1.
432 mr r11,r1 /* Save r1 */
433 lhz r10,PACA_IN_MCE(r13)
434 cmpwi r10,0 /* Are we in nested machine check */
435 bne 0f /* Yes, we are. */
436 /* First machine check entry */
437 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
438 0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
439 addi r10,r10,1 /* increment paca->in_mce */
440 sth r10,PACA_IN_MCE(r13)
441 /* Limit nested MCE to level 4 to avoid stack overflow */
443 bgt 2f /* Check if we hit limit of 4 */
444 std r11,GPR1(r1) /* Save r1 on the stack. */
445 std r11,0(r1) /* make stack chain pointer */
446 mfspr r11,SPRN_SRR0 /* Save SRR0 */
448 mfspr r11,SPRN_SRR1 /* Save SRR1 */
450 mfspr r11,SPRN_DAR /* Save DAR */
452 mfspr r11,SPRN_DSISR /* Save DSISR */
454 std r9,_CCR(r1) /* Save CR in stackframe */
455 /* Save r9 through r13 from EXMC save area to stack frame. */
456 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC)
457 mfmsr r11 /* get MSR value */
458 ori r11,r11,MSR_ME /* turn on ME bit */
459 ori r11,r11,MSR_RI /* turn on RI bit */
460 ld r12,PACAKBASE(r13) /* get high part of &label */
461 LOAD_HANDLER(r12, machine_check_handle_early)
462 1: mtspr SPRN_SRR0,r12
465 b . /* prevent speculative execution */
467 /* Stack overflow. Stay on emergency stack and panic.
468 * Keep the ME bit off while panic-ing, so that if we hit
469 * another machine check we checkstop.
471 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */
473 ld r12,PACAKBASE(r13)
474 LOAD_HANDLER(r12, unrecover_mce)
476 andc r11,r11,r10 /* Turn off MSR_ME */
478 b . /* prevent speculative execution */
479 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
481 machine_check_pSeries:
482 .globl machine_check_fwnmi
484 SET_SCRATCH0(r13) /* save r13 */
485 EXCEPTION_PROLOG_0(PACA_EXMC)
486 machine_check_pSeries_0:
487 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200)
488 EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD)
489 KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
490 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
491 KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
492 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x400)
493 KVM_HANDLER(PACA_EXSLB, EXC_STD, 0x480)
494 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x900)
495 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
497 #ifdef CONFIG_PPC_DENORMALISATION
501 * To denormalise we need to move a copy of the register to itself.
502 * For POWER6 do that here for all FP regs.
505 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
506 xori r10,r10,(MSR_FE0|MSR_FE1)
510 #define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
511 #define FMR4(n) FMR2(n) ; FMR2(n+2)
512 #define FMR8(n) FMR4(n) ; FMR4(n+4)
513 #define FMR16(n) FMR8(n) ; FMR8(n+8)
514 #define FMR32(n) FMR16(n) ; FMR16(n+16)
519 * To denormalise we need to move a copy of the register to itself.
520 * For POWER7 do that here for the first 32 VSX registers only.
523 oris r10,r10,MSR_VSX@h
527 #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
528 #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
529 #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
530 #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
531 #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
534 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
538 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
540 * To denormalise we need to move a copy of the register to itself.
541 * For POWER8 we need to do that for all 64 VSX registers
547 ld r9,PACA_EXGEN+EX_R9(r13)
548 RESTORE_PPR_PACA(PACA_EXGEN, r10)
550 ld r10,PACA_EXGEN+EX_CFAR(r13)
552 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
553 ld r10,PACA_EXGEN+EX_R10(r13)
554 ld r11,PACA_EXGEN+EX_R11(r13)
555 ld r12,PACA_EXGEN+EX_R12(r13)
556 ld r13,PACA_EXGEN+EX_R13(r13)
562 /* moved from 0xe00 */
563 STD_EXCEPTION_HV_OOL(0xe02, h_data_storage)
564 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
565 STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage)
566 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
567 STD_EXCEPTION_HV_OOL(0xe42, emulation_assist)
568 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
569 MASKABLE_EXCEPTION_HV_OOL(0xe62, hmi_exception)
570 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
572 MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell)
573 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
575 MASKABLE_EXCEPTION_HV_OOL(0xea2, h_virt_irq)
576 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xea2)
578 /* moved from 0xf00 */
579 STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
580 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf00)
581 STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
582 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf20)
583 STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
584 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf40)
585 STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
586 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf60)
587 STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable)
588 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82)
591 * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
592 * - If it was a decrementer interrupt, we bump the dec to max and and return.
593 * - If it was a doorbell we return immediately since doorbells are edge
594 * triggered and won't automatically refire.
595 * - If it was a HMI we return immediately since we handled it in realmode
596 * and it won't refire.
597 * - else we hard disable and return.
598 * This is called with r10 containing the value to OR to the paca field.
600 #define MASKED_INTERRUPT(_H) \
601 masked_##_H##interrupt: \
602 std r11,PACA_EXGEN+EX_R11(r13); \
603 lbz r11,PACAIRQHAPPENED(r13); \
605 stb r11,PACAIRQHAPPENED(r13); \
606 cmpwi r10,PACA_IRQ_DEC; \
609 ori r10,r10,0xffff; \
610 mtspr SPRN_DEC,r10; \
612 1: cmpwi r10,PACA_IRQ_DBELL; \
614 cmpwi r10,PACA_IRQ_HMI; \
616 mfspr r10,SPRN_##_H##SRR1; \
617 rldicl r10,r10,48,1; /* clear MSR_EE */ \
619 mtspr SPRN_##_H##SRR1,r10; \
621 ld r9,PACA_EXGEN+EX_R9(r13); \
622 ld r10,PACA_EXGEN+EX_R10(r13); \
623 ld r11,PACA_EXGEN+EX_R11(r13); \
632 * Called from arch_local_irq_enable when an interrupt needs
633 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
634 * which kind of interrupt. MSR:EE is already off. We generate a
635 * stackframe like if a real interrupt had happened.
637 * Note: While MSR:EE is off, we need to make sure that _MSR
638 * in the generated frame has EE set to 1 or the exception
639 * handler will not properly re-enable them.
641 _GLOBAL(__replay_interrupt)
642 /* We are going to jump to the exception common code which
643 * will retrieve various register values from the PACA which
644 * we don't give a damn about, so we don't bother storing them.
651 beq decrementer_common
653 beq hardware_interrupt_common
656 beq h_doorbell_common
658 beq h_virt_irq_common
660 beq hmi_exception_common
663 beq doorbell_super_common
664 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
667 #ifdef CONFIG_PPC_PSERIES
669 * Vectors for the FWNMI option. Share common code.
671 .globl system_reset_fwnmi
674 SET_SCRATCH0(r13) /* save r13 */
675 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
678 #endif /* CONFIG_PPC_PSERIES */
680 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
681 kvmppc_skip_interrupt:
683 * Here all GPRs are unchanged from when the interrupt happened
684 * except for r13, which is saved in SPRG_SCRATCH0.
693 kvmppc_skip_Hinterrupt:
695 * Here all GPRs are unchanged from when the interrupt happened
696 * except for r13, which is saved in SPRG_SCRATCH0.
698 mfspr r13, SPRN_HSRR0
700 mtspr SPRN_HSRR0, r13
707 * Ensure that any handlers that get invoked from the exception prologs
708 * above are below the first 64KB (0x10000) of the kernel image because
709 * the prologs assemble the addresses of these handlers using the
710 * LOAD_HANDLER macro, which uses an ori instruction.
713 /*** Common interrupt handlers ***/
715 STD_EXCEPTION_COMMON(0x100, system_reset, system_reset_exception)
717 STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
718 STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, timer_interrupt)
719 STD_EXCEPTION_COMMON(0x980, hdecrementer, hdec_interrupt)
720 #ifdef CONFIG_PPC_DOORBELL
721 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, doorbell_exception)
723 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, unknown_exception)
725 STD_EXCEPTION_COMMON(0xb00, trap_0b, unknown_exception)
726 STD_EXCEPTION_COMMON(0xd00, single_step, single_step_exception)
727 STD_EXCEPTION_COMMON(0xe00, trap_0e, unknown_exception)
728 STD_EXCEPTION_COMMON(0xe40, emulation_assist, emulation_assist_interrupt)
729 STD_EXCEPTION_COMMON_ASYNC(0xe60, hmi_exception, handle_hmi_exception)
730 #ifdef CONFIG_PPC_DOORBELL
731 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, doorbell_exception)
733 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, unknown_exception)
735 STD_EXCEPTION_COMMON_ASYNC(0xea0, h_virt_irq, do_IRQ)
736 STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, performance_monitor_exception)
737 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, instruction_breakpoint_exception)
738 STD_EXCEPTION_COMMON(0x1502, denorm, unknown_exception)
739 #ifdef CONFIG_ALTIVEC
740 STD_EXCEPTION_COMMON(0x1700, altivec_assist, altivec_assist_exception)
742 STD_EXCEPTION_COMMON(0x1700, altivec_assist, unknown_exception)
746 * Relocation-on interrupts: A subset of the interrupts can be delivered
747 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
748 * it. Addresses are the same as the original interrupt addresses, but
749 * offset by 0xc000000000004000.
750 * It's impossible to receive interrupts below 0x300 via this mechanism.
751 * KVM: None of these traps are from the guest ; anything that escalated
752 * to HV=1 from HV=0 is delivered via real mode handlers.
756 * This uses the standard macro, since the original 0x300 vector
757 * only has extra guff for STAB-based processors -- which never
760 STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access)
762 .globl data_access_slb_relon_pSeries
763 data_access_slb_relon_pSeries:
765 EXCEPTION_PROLOG_0(PACA_EXSLB)
766 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
767 std r3,PACA_EXSLB+EX_R3(r13)
770 #ifndef CONFIG_RELOCATABLE
774 * We can't just use a direct branch to slb_miss_realmode
775 * because the distance from here to there depends on where
776 * the kernel ends up being put.
779 ld r10,PACAKBASE(r13)
780 LOAD_HANDLER(r10, slb_miss_realmode)
785 STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access)
787 .globl instruction_access_slb_relon_pSeries
788 instruction_access_slb_relon_pSeries:
790 EXCEPTION_PROLOG_0(PACA_EXSLB)
791 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
792 std r3,PACA_EXSLB+EX_R3(r13)
793 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
795 #ifndef CONFIG_RELOCATABLE
799 ld r10,PACAKBASE(r13)
800 LOAD_HANDLER(r10, slb_miss_realmode)
806 .globl hardware_interrupt_relon_pSeries;
807 .globl hardware_interrupt_relon_hv;
808 hardware_interrupt_relon_pSeries:
809 hardware_interrupt_relon_hv:
811 _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
813 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
814 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
815 STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
816 STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
817 STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
818 MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
819 STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
820 MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
821 STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
824 .globl system_call_relon_pSeries
825 system_call_relon_pSeries:
828 SYSCALL_PSERIES_2_DIRECT
831 STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step)
834 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
837 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
840 emulation_assist_relon_trampoline:
842 EXCEPTION_PROLOG_0(PACA_EXGEN)
843 b emulation_assist_relon_hv
846 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
849 h_doorbell_relon_trampoline:
851 EXCEPTION_PROLOG_0(PACA_EXGEN)
852 b h_doorbell_relon_hv
855 h_virt_irq_relon_trampoline:
857 EXCEPTION_PROLOG_0(PACA_EXGEN)
858 b h_virt_irq_relon_hv
861 performance_monitor_relon_pseries_trampoline:
863 EXCEPTION_PROLOG_0(PACA_EXGEN)
864 b performance_monitor_relon_pSeries
867 altivec_unavailable_relon_pseries_trampoline:
869 EXCEPTION_PROLOG_0(PACA_EXGEN)
870 b altivec_unavailable_relon_pSeries
873 vsx_unavailable_relon_pseries_trampoline:
875 EXCEPTION_PROLOG_0(PACA_EXGEN)
876 b vsx_unavailable_relon_pSeries
879 facility_unavailable_relon_trampoline:
881 EXCEPTION_PROLOG_0(PACA_EXGEN)
882 b facility_unavailable_relon_pSeries
885 hv_facility_unavailable_relon_trampoline:
887 EXCEPTION_PROLOG_0(PACA_EXGEN)
888 b hv_facility_unavailable_relon_hv
890 STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
891 #ifdef CONFIG_PPC_DENORMALISATION
893 b denorm_exception_hv
895 STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist)
901 ppc64_runlatch_on_trampoline:
902 b __ppc64_runlatch_on
905 * Here r13 points to the paca, r9 contains the saved CR,
906 * SRR0 and SRR1 are saved in r11 and r12,
907 * r9 - r13 are saved in paca->exgen.
910 .globl data_access_common
913 std r10,PACA_EXGEN+EX_DAR(r13)
915 stw r10,PACA_EXGEN+EX_DSISR(r13)
916 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
917 RECONCILE_IRQ_STATE(r10, r11)
919 ld r3,PACA_EXGEN+EX_DAR(r13)
920 lwz r4,PACA_EXGEN+EX_DSISR(r13)
924 BEGIN_MMU_FTR_SECTION
925 b do_hash_page /* Try to handle as hpte fault */
928 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
931 .globl h_data_storage_common
932 h_data_storage_common:
934 std r10,PACA_EXGEN+EX_DAR(r13)
935 mfspr r10,SPRN_HDSISR
936 stw r10,PACA_EXGEN+EX_DSISR(r13)
937 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
939 RECONCILE_IRQ_STATE(r10, r11)
940 addi r3,r1,STACK_FRAME_OVERHEAD
945 .globl instruction_access_common
946 instruction_access_common:
947 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
948 RECONCILE_IRQ_STATE(r10, r11)
955 BEGIN_MMU_FTR_SECTION
956 b do_hash_page /* Try to handle as hpte fault */
959 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
961 STD_EXCEPTION_COMMON(0xe20, h_instr_storage, unknown_exception)
964 * Machine check is different because we use a different
965 * save area: PACA_EXMC instead of PACA_EXGEN.
968 .globl machine_check_common
969 machine_check_common:
972 std r10,PACA_EXGEN+EX_DAR(r13)
974 stw r10,PACA_EXGEN+EX_DSISR(r13)
975 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
977 RECONCILE_IRQ_STATE(r10, r11)
978 ld r3,PACA_EXGEN+EX_DAR(r13)
979 lwz r4,PACA_EXGEN+EX_DSISR(r13)
983 addi r3,r1,STACK_FRAME_OVERHEAD
984 bl machine_check_exception
988 .globl alignment_common
991 std r10,PACA_EXGEN+EX_DAR(r13)
993 stw r10,PACA_EXGEN+EX_DSISR(r13)
994 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
995 ld r3,PACA_EXGEN+EX_DAR(r13)
996 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1000 RECONCILE_IRQ_STATE(r10, r11)
1001 addi r3,r1,STACK_FRAME_OVERHEAD
1002 bl alignment_exception
1006 .globl program_check_common
1007 program_check_common:
1008 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1010 RECONCILE_IRQ_STATE(r10, r11)
1011 addi r3,r1,STACK_FRAME_OVERHEAD
1012 bl program_check_exception
1016 .globl fp_unavailable_common
1017 fp_unavailable_common:
1018 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1019 bne 1f /* if from user, just load it up */
1021 RECONCILE_IRQ_STATE(r10, r11)
1022 addi r3,r1,STACK_FRAME_OVERHEAD
1023 bl kernel_fp_unavailable_exception
1026 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1028 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1029 * transaction), go do TM stuff
1031 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1033 END_FTR_SECTION_IFSET(CPU_FTR_TM)
1036 b fast_exception_return
1037 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1038 2: /* User process was in a transaction */
1040 RECONCILE_IRQ_STATE(r10, r11)
1041 addi r3,r1,STACK_FRAME_OVERHEAD
1042 bl fp_unavailable_tm
1046 .globl altivec_unavailable_common
1047 altivec_unavailable_common:
1048 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1049 #ifdef CONFIG_ALTIVEC
1052 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1053 BEGIN_FTR_SECTION_NESTED(69)
1054 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1055 * transaction), go do TM stuff
1057 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1059 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1062 b fast_exception_return
1063 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1064 2: /* User process was in a transaction */
1066 RECONCILE_IRQ_STATE(r10, r11)
1067 addi r3,r1,STACK_FRAME_OVERHEAD
1068 bl altivec_unavailable_tm
1072 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1075 RECONCILE_IRQ_STATE(r10, r11)
1076 addi r3,r1,STACK_FRAME_OVERHEAD
1077 bl altivec_unavailable_exception
1081 .globl vsx_unavailable_common
1082 vsx_unavailable_common:
1083 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
1087 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1088 BEGIN_FTR_SECTION_NESTED(69)
1089 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1090 * transaction), go do TM stuff
1092 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1094 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1097 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1098 2: /* User process was in a transaction */
1100 RECONCILE_IRQ_STATE(r10, r11)
1101 addi r3,r1,STACK_FRAME_OVERHEAD
1102 bl vsx_unavailable_tm
1106 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
1109 RECONCILE_IRQ_STATE(r10, r11)
1110 addi r3,r1,STACK_FRAME_OVERHEAD
1111 bl vsx_unavailable_exception
1114 /* Equivalents to the above handlers for relocation-on interrupt vectors */
1115 STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
1116 MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell)
1117 MASKABLE_RELON_EXCEPTION_HV_OOL(0xea0, h_virt_irq)
1119 STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
1120 STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
1121 STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
1122 STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
1123 STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_unavailable)
1126 * The __end_interrupts marker must be past the out-of-line (OOL)
1127 * handlers, so that they are copied to real address 0x100 when running
1128 * a relocatable kernel. This ensures they can be reached from the short
1129 * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch
1130 * directly, without using LOAD_HANDLER().
1133 .globl __end_interrupts
1136 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
1138 * Data area reserved for FWNMI option.
1139 * This address (0x7000) is fixed by the RPA.
1142 .globl fwnmi_data_area
1145 /* pseries and powernv need to keep the whole page from
1146 * 0x7000 to 0x8000 free for use by the firmware
1149 #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1151 STD_EXCEPTION_COMMON(0xf60, facility_unavailable, facility_unavailable_exception)
1152 STD_EXCEPTION_COMMON(0xf80, hv_facility_unavailable, facility_unavailable_exception)
1154 #ifdef CONFIG_CBE_RAS
1155 STD_EXCEPTION_COMMON(0x1200, cbe_system_error, cbe_system_error_exception)
1156 STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, cbe_maintenance_exception)
1157 STD_EXCEPTION_COMMON(0x1800, cbe_thermal, cbe_thermal_exception)
1158 #endif /* CONFIG_CBE_RAS */
1160 .globl hmi_exception_early
1161 hmi_exception_early:
1162 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST, 0xe62)
1163 mr r10,r1 /* Save r1 */
1164 ld r1,PACAEMERGSP(r13) /* Use emergency stack */
1165 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
1166 std r9,_CCR(r1) /* save CR in stackframe */
1167 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
1168 std r11,_NIP(r1) /* save HSRR0 in stackframe */
1169 mfspr r12,SPRN_HSRR1 /* Save SRR1 */
1170 std r12,_MSR(r1) /* save SRR1 in stackframe */
1171 std r10,0(r1) /* make stack chain pointer */
1172 std r0,GPR0(r1) /* save r0 in stackframe */
1173 std r10,GPR1(r1) /* save r1 in stackframe */
1174 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
1175 EXCEPTION_PROLOG_COMMON_3(0xe60)
1176 addi r3,r1,STACK_FRAME_OVERHEAD
1177 bl hmi_exception_realmode
1178 /* Windup the stack. */
1179 /* Move original HSRR0 and HSRR1 into the respective regs */
1197 /* restore original r1. */
1201 * Go to virtual mode and pull the HMI event information from
1204 .globl hmi_exception_after_realmode
1205 hmi_exception_after_realmode:
1207 EXCEPTION_PROLOG_0(PACA_EXGEN)
1211 #define MACHINE_CHECK_HANDLER_WINDUP \
1212 /* Clear MSR_RI before setting SRR0 and SRR1. */\
1214 mfmsr r9; /* get MSR value */ \
1216 mtmsrd r9,1; /* Clear MSR_RI */ \
1217 /* Move original SRR0 and SRR1 into the respective regs */ \
1219 mtspr SPRN_SRR1,r9; \
1221 mtspr SPRN_SRR0,r3; \
1229 REST_8GPRS(2, r1); \
1233 /* Decrement paca->in_mce. */ \
1234 lhz r12,PACA_IN_MCE(r13); \
1236 sth r12,PACA_IN_MCE(r13); \
1238 REST_2GPRS(12, r1); \
1239 /* restore original r1. */ \
1243 * Handle machine check early in real mode. We come here with
1244 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack.
1247 .globl machine_check_handle_early
1248 machine_check_handle_early:
1249 std r0,GPR0(r1) /* Save r0 */
1250 EXCEPTION_PROLOG_COMMON_3(0x200)
1252 addi r3,r1,STACK_FRAME_OVERHEAD
1253 bl machine_check_early
1254 std r3,RESULT(r1) /* Save result */
1256 #ifdef CONFIG_PPC_P7_NAP
1258 * Check if thread was in power saving mode. We come here when any
1259 * of the following is true:
1260 * a. thread wasn't in power saving mode
1261 * b. thread was in power saving mode with no state loss,
1262 * supervisor state loss or hypervisor state loss.
1264 * Go back to nap/sleep/winkle mode again if (b) is true.
1266 rlwinm. r11,r12,47-31,30,31 /* Was it in power saving mode? */
1267 beq 4f /* No, it wasn;t */
1268 /* Thread was in power saving mode. Go back to nap again. */
1271 /* Supervisor/Hypervisor state loss */
1273 stb r0,PACA_NAPSTATELOST(r13)
1274 3: bl machine_check_queue_event
1275 MACHINE_CHECK_HANDLER_WINDUP
1279 * Check what idle state this CPU was in and go back to same mode
1282 lbz r3,PACA_THREAD_IDLE_STATE(r13)
1283 cmpwi r3,PNV_THREAD_NAP
1285 IDLE_STATE_ENTER_SEQ(PPC_NAP)
1288 cmpwi r3,PNV_THREAD_SLEEP
1290 IDLE_STATE_ENTER_SEQ(PPC_SLEEP)
1295 * Go back to winkle. Please note that this thread was woken up in
1296 * machine check from winkle and have not restored the per-subcore
1297 * state. Hence before going back to winkle, set last bit of HSPGR0
1298 * to 1. This will make sure that if this thread gets woken up
1299 * again at reset vector 0x100 then it will get chance to restore
1300 * the subcore state.
1304 IDLE_STATE_ENTER_SEQ(PPC_WINKLE)
1309 * Check if we are coming from hypervisor userspace. If yes then we
1310 * continue in host kernel in V mode to deliver the MC event.
1312 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */
1314 andi. r11,r12,MSR_PR /* See if coming from user. */
1315 bne 9f /* continue in V mode if we are. */
1318 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
1320 * We are coming from kernel context. Check if we are coming from
1321 * guest. if yes, then we can continue. We will fall through
1322 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest.
1324 lbz r11,HSTATE_IN_GUEST(r13)
1325 cmpwi r11,0 /* Check if coming from guest */
1326 bne 9f /* continue if we are. */
1329 * At this point we are not sure about what context we come from.
1330 * Queue up the MCE event and return from the interrupt.
1331 * But before that, check if this is an un-recoverable exception.
1332 * If yes, then stay on emergency stack and panic.
1334 andi. r11,r12,MSR_RI
1336 1: mfspr r11,SPRN_SRR0
1337 ld r10,PACAKBASE(r13)
1338 LOAD_HANDLER(r10,unrecover_mce)
1340 ld r10,PACAKMSR(r13)
1342 * We are going down. But there are chances that we might get hit by
1343 * another MCE during panic path and we may run into unstable state
1344 * with no way out. Hence, turn ME bit off while going down, so that
1345 * when another MCE is hit during panic path, system will checkstop
1346 * and hypervisor will get restarted cleanly by SP.
1349 andc r10,r10,r3 /* Turn off MSR_ME */
1355 * Check if we have successfully handled/recovered from error, if not
1356 * then stay on emergency stack and panic.
1358 ld r3,RESULT(r1) /* Load result */
1359 cmpdi r3,0 /* see if we handled MCE successfully */
1361 beq 1b /* if !handled then panic */
1363 * Return from MC interrupt.
1364 * Queue up the MCE event so that we can log it later, while
1365 * returning from kernel or opal call.
1367 bl machine_check_queue_event
1368 MACHINE_CHECK_HANDLER_WINDUP
1371 /* Deliver the machine check to host kernel in V mode. */
1372 MACHINE_CHECK_HANDLER_WINDUP
1373 b machine_check_pSeries
1376 /* Invoke machine_check_exception to print MCE event and panic. */
1377 addi r3,r1,STACK_FRAME_OVERHEAD
1378 bl machine_check_exception
1380 * We will not reach here. Even if we did, there is no way out. Call
1381 * unrecoverable_exception and die.
1383 1: addi r3,r1,STACK_FRAME_OVERHEAD
1384 bl unrecoverable_exception
1387 * r13 points to the PACA, r9 contains the saved CR,
1388 * r12 contain the saved SRR1, SRR0 is still ready for return
1389 * r3 has the faulting address
1390 * r9 - r13 are saved in paca->exslb.
1391 * r3 is saved in paca->slb_r3
1392 * We assume we aren't going to take any exceptions during this procedure.
1396 #ifdef CONFIG_RELOCATABLE
1400 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1401 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
1403 #ifdef CONFIG_PPC_STD_MMU_64
1404 BEGIN_MMU_FTR_SECTION
1405 bl slb_allocate_realmode
1406 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
1408 /* All done -- return from exception. */
1410 ld r10,PACA_EXSLB+EX_LR(r13)
1411 ld r3,PACA_EXSLB+EX_R3(r13)
1412 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1415 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1416 BEGIN_MMU_FTR_SECTION
1420 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
1425 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
1428 RESTORE_PPR_PACA(PACA_EXSLB, r9)
1429 ld r9,PACA_EXSLB+EX_R9(r13)
1430 ld r10,PACA_EXSLB+EX_R10(r13)
1431 ld r11,PACA_EXSLB+EX_R11(r13)
1432 ld r12,PACA_EXSLB+EX_R12(r13)
1433 ld r13,PACA_EXSLB+EX_R13(r13)
1435 b . /* prevent speculative execution */
1437 2: mfspr r11,SPRN_SRR0
1438 ld r10,PACAKBASE(r13)
1439 LOAD_HANDLER(r10,unrecov_slb)
1441 ld r10,PACAKMSR(r13)
1447 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1448 RECONCILE_IRQ_STATE(r10, r11)
1450 1: addi r3,r1,STACK_FRAME_OVERHEAD
1451 bl unrecoverable_exception
1455 #ifdef CONFIG_PPC_970_NAP
1458 std r9,TI_LOCAL_FLAGS(r11)
1459 ld r10,_LINK(r1) /* make idle task do the */
1460 std r10,_NIP(r1) /* equivalent of a blr */
1469 #ifdef CONFIG_PPC_STD_MMU_64
1470 andis. r0,r4,0xa410 /* weird error? */
1471 bne- handle_page_fault /* if not, try to insert a HPTE */
1472 andis. r0,r4,DSISR_DABRMATCH@h
1473 bne- handle_dabr_fault
1474 CURRENT_THREAD_INFO(r11, r1)
1475 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
1476 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
1477 bne 77f /* then don't call hash_page now */
1480 * r3 contains the faulting address
1482 * r5 contains the trap number
1485 * at return r3 = 0 for success, 1 for page fault, negative for error
1489 bl __hash_page /* build HPTE if possible */
1490 cmpdi r3,0 /* see if __hash_page succeeded */
1493 beq fast_exc_return_irq /* Return from exception on success */
1497 #endif /* CONFIG_PPC_STD_MMU_64 */
1499 /* Here we have a page fault that hash_page can't handle. */
1503 addi r3,r1,STACK_FRAME_OVERHEAD
1509 addi r3,r1,STACK_FRAME_OVERHEAD
1514 /* We have a data breakpoint exception - handle it */
1519 addi r3,r1,STACK_FRAME_OVERHEAD
1521 12: b ret_from_except_lite
1524 #ifdef CONFIG_PPC_STD_MMU_64
1525 /* We have a page fault that hash_page could handle but HV refused
1530 addi r3,r1,STACK_FRAME_OVERHEAD
1537 * We come here as a result of a DSI at a point where we don't want
1538 * to call hash_page, such as when we are accessing memory (possibly
1539 * user memory) inside a PMU interrupt that occurred while interrupts
1540 * were soft-disabled. We want to invoke the exception handler for
1541 * the access, or panic if there isn't a handler.
1545 addi r3,r1,STACK_FRAME_OVERHEAD
1551 * Here we have detected that the kernel stack pointer is bad.
1552 * R9 contains the saved CR, r13 points to the paca,
1553 * r10 contains the (bad) kernel stack pointer,
1554 * r11 and r12 contain the saved SRR0 and SRR1.
1555 * We switch to using an emergency stack, save the registers there,
1556 * and call kernel_bad_stack(), which panics.
1559 ld r1,PACAEMERGSP(r13)
1560 subi r1,r1,64+INT_FRAME_SIZE
1566 mfspr r12,SPRN_DSISR
1592 std r10,ORIG_GPR3(r1)
1593 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1596 lhz r12,PACA_TRAP_SAVE(r13)
1598 addi r11,r1,INT_FRAME_SIZE
1603 ld r11,exception_marker@toc(r2)
1605 std r11,STACK_FRAME_OVERHEAD-16(r1)
1606 1: addi r3,r1,STACK_FRAME_OVERHEAD