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 */ \
58 2: mfspr r12,SPRN_SRR1 ; \
59 andi. r12,r12,MSR_PR ; \
61 mtspr SPRN_SRR0,r3 ; \
62 mtspr SPRN_SRR1,r4 ; \
63 mtspr SPRN_SDR1,r5 ; \
65 b . ; /* prevent speculative execution */
67 #if defined(CONFIG_RELOCATABLE)
69 * We can't branch directly; in the direct case we use LR
70 * and system_call_entry restores LR. (We thus need to move
71 * LR to r10 in the RFID case too.)
73 #define SYSCALL_PSERIES_2_DIRECT \
75 ld r12,PACAKBASE(r13) ; \
76 LOAD_HANDLER(r12, system_call_entry_direct) ; \
78 mfspr r12,SPRN_SRR1 ; \
79 /* Re-use of r13... No spare regs to do this */ \
82 GET_PACA(r13) ; /* get r13 back */ \
85 /* We can branch directly */
86 #define SYSCALL_PSERIES_2_DIRECT \
87 mfspr r12,SPRN_SRR1 ; \
89 mtmsrd r10,1 ; /* Set RI (EE=0) */ \
90 b system_call_entry_direct ;
94 * This is the start of the interrupt handlers for pSeries
95 * This code runs with relocation off.
96 * Code from here to __end_interrupts gets copied down to real
97 * address 0x100 when we are running a relocatable kernel.
98 * Therefore any relative branches in this section must only
99 * branch to labels in this section.
102 .globl __start_interrupts
105 .globl system_reset_pSeries;
106 system_reset_pSeries:
107 HMT_MEDIUM_PPR_DISCARD
109 #ifdef CONFIG_PPC_P7_NAP
111 /* Running native on arch 2.06 or later, check if we are
112 * waking up from nap. We only handle no state loss and
113 * supervisor state loss. We do -not- handle hypervisor
114 * state loss at this time.
117 rlwinm. r13,r13,47-31,30,31
120 /* waking up from powersave (nap) state */
122 /* Total loss of HV state is fatal, we could try to use the
123 * PIR to locate a PACA, then use an emergency stack etc...
124 * OPAL v3 based powernv platforms have new idle states
125 * which fall in this catagory.
130 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
131 li r0,KVM_HWTHREAD_IN_KERNEL
132 stb r0,HSTATE_HWTHREAD_STATE(r13)
133 /* Order setting hwthread_state vs. testing hwthread_req */
135 lbz r0,HSTATE_HWTHREAD_REQ(r13)
143 b .power7_wakeup_noloss
144 2: b .power7_wakeup_loss
146 /* Fast Sleep wakeup on PowerNV */
148 b .power7_wakeup_tb_loss
151 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
152 #endif /* CONFIG_PPC_P7_NAP */
153 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
157 machine_check_pSeries_1:
158 /* This is moved out of line as it can be patched by FW, but
159 * some code path might still want to branch into the original
162 HMT_MEDIUM_PPR_DISCARD
163 SET_SCRATCH0(r13) /* save r13 */
164 #ifdef CONFIG_PPC_P7_NAP
166 /* Running native on arch 2.06 or later, check if we are
167 * waking up from nap. We only handle no state loss and
168 * supervisor state loss. We do -not- handle hypervisor
169 * state loss at this time.
172 rlwinm. r13,r13,47-31,30,31
173 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
177 rlwinm. r13,r13,47-31,30,31
178 /* waking up from powersave (nap) state */
180 /* Total loss of HV state is fatal. let's just stay stuck here */
181 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
184 OPT_SET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
185 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
186 #endif /* CONFIG_PPC_P7_NAP */
187 EXCEPTION_PROLOG_0(PACA_EXMC)
189 b machine_check_pSeries_early
191 b machine_check_pSeries_0
192 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
195 .globl data_access_pSeries
197 HMT_MEDIUM_PPR_DISCARD
200 b data_access_check_stab
201 data_access_not_stab:
202 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
203 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
207 .globl data_access_slb_pSeries
208 data_access_slb_pSeries:
209 HMT_MEDIUM_PPR_DISCARD
211 EXCEPTION_PROLOG_0(PACA_EXSLB)
212 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
213 std r3,PACA_EXSLB+EX_R3(r13)
216 /* Keep that around for when we re-implement dynamic VSIDs */
218 bge slb_miss_user_pseries
219 #endif /* __DISABLED__ */
221 #ifndef CONFIG_RELOCATABLE
225 * We can't just use a direct branch to .slb_miss_realmode
226 * because the distance from here to there depends on where
227 * the kernel ends up being put.
230 ld r10,PACAKBASE(r13)
231 LOAD_HANDLER(r10, .slb_miss_realmode)
236 STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
239 .globl instruction_access_slb_pSeries
240 instruction_access_slb_pSeries:
241 HMT_MEDIUM_PPR_DISCARD
243 EXCEPTION_PROLOG_0(PACA_EXSLB)
244 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
245 std r3,PACA_EXSLB+EX_R3(r13)
246 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
248 /* Keep that around for when we re-implement dynamic VSIDs */
250 bge slb_miss_user_pseries
251 #endif /* __DISABLED__ */
253 #ifndef CONFIG_RELOCATABLE
257 ld r10,PACAKBASE(r13)
258 LOAD_HANDLER(r10, .slb_miss_realmode)
263 /* We open code these as we can't have a ". = x" (even with
264 * x = "." within a feature section
267 .globl hardware_interrupt_pSeries;
268 .globl hardware_interrupt_hv;
269 hardware_interrupt_pSeries:
270 hardware_interrupt_hv:
271 HMT_MEDIUM_PPR_DISCARD
273 _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
274 EXC_HV, SOFTEN_TEST_HV)
275 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
277 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
278 EXC_STD, SOFTEN_TEST_HV_201)
279 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
280 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
282 STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
283 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
285 STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
286 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
288 STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
289 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
292 .globl decrementer_pSeries
294 _MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR)
296 STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
298 MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
299 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
301 STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
302 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
305 .globl system_call_pSeries
308 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
311 std r9,PACA_EXGEN+EX_R9(r13)
312 std r10,PACA_EXGEN+EX_R10(r13)
318 SYSCALL_PSERIES_2_RFID
320 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
322 STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
323 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
325 /* At 0xe??? we have a bunch of hypervisor exceptions, we branch
326 * out of line to handle them
329 hv_data_storage_trampoline:
331 EXCEPTION_PROLOG_0(PACA_EXGEN)
335 hv_instr_storage_trampoline:
337 EXCEPTION_PROLOG_0(PACA_EXGEN)
341 emulation_assist_trampoline:
343 EXCEPTION_PROLOG_0(PACA_EXGEN)
344 b emulation_assist_hv
347 hv_exception_trampoline:
349 EXCEPTION_PROLOG_0(PACA_EXGEN)
353 hv_doorbell_trampoline:
355 EXCEPTION_PROLOG_0(PACA_EXGEN)
358 /* We need to deal with the Altivec unavailable exception
359 * here which is at 0xf20, thus in the middle of the
360 * prolog code of the PerformanceMonitor one. A little
361 * trickery is thus necessary
364 performance_monitor_pseries_trampoline:
366 EXCEPTION_PROLOG_0(PACA_EXGEN)
367 b performance_monitor_pSeries
370 altivec_unavailable_pseries_trampoline:
372 EXCEPTION_PROLOG_0(PACA_EXGEN)
373 b altivec_unavailable_pSeries
376 vsx_unavailable_pseries_trampoline:
378 EXCEPTION_PROLOG_0(PACA_EXGEN)
379 b vsx_unavailable_pSeries
382 facility_unavailable_trampoline:
384 EXCEPTION_PROLOG_0(PACA_EXGEN)
385 b facility_unavailable_pSeries
388 hv_facility_unavailable_trampoline:
390 EXCEPTION_PROLOG_0(PACA_EXGEN)
391 b facility_unavailable_hv
393 #ifdef CONFIG_CBE_RAS
394 STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
395 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
396 #endif /* CONFIG_CBE_RAS */
398 STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
399 KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
402 .global denorm_exception_hv
404 HMT_MEDIUM_PPR_DISCARD
405 mtspr SPRN_SPRG_HSCRATCH0,r13
406 EXCEPTION_PROLOG_0(PACA_EXGEN)
407 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
409 #ifdef CONFIG_PPC_DENORMALISATION
411 mfspr r11,SPRN_HSRR0 /* save HSRR0 */
412 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
413 addi r11,r11,-4 /* HSRR0 is next instruction */
418 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
419 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500)
421 #ifdef CONFIG_CBE_RAS
422 STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
423 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
424 #endif /* CONFIG_CBE_RAS */
426 STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
427 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
429 #ifdef CONFIG_CBE_RAS
430 STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
431 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
434 #endif /* CONFIG_CBE_RAS */
437 /*** Out of line interrupts support ***/
440 /* moved from 0x200 */
441 machine_check_pSeries_early:
443 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
448 * Original R9 to R13 is saved on PACA_EXMC
450 * Switch to mc_emergency stack and handle re-entrancy (though we
451 * currently don't test for overflow). Save MCE registers srr1,
452 * srr0, dar and dsisr and then set ME=1
454 * We use paca->in_mce to check whether this is the first entry or
455 * nested machine check. We increment paca->in_mce to track nested
458 * If this is the first entry then set stack pointer to
459 * paca->mc_emergency_sp, otherwise r1 is already pointing to
460 * stack frame on mc_emergency stack.
462 * NOTE: We are here with MSR_ME=0 (off), which means we risk a
463 * checkstop if we get another machine check exception before we do
464 * rfid with MSR_ME=1.
466 mr r11,r1 /* Save r1 */
467 lhz r10,PACA_IN_MCE(r13)
468 cmpwi r10,0 /* Are we in nested machine check */
469 bne 0f /* Yes, we are. */
470 /* First machine check entry */
471 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
472 0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
473 addi r10,r10,1 /* increment paca->in_mce */
474 sth r10,PACA_IN_MCE(r13)
475 std r11,GPR1(r1) /* Save r1 on the stack. */
476 std r11,0(r1) /* make stack chain pointer */
477 mfspr r11,SPRN_SRR0 /* Save SRR0 */
479 mfspr r11,SPRN_SRR1 /* Save SRR1 */
481 mfspr r11,SPRN_DAR /* Save DAR */
483 mfspr r11,SPRN_DSISR /* Save DSISR */
485 std r9,_CCR(r1) /* Save CR in stackframe */
486 /* Save r9 through r13 from EXMC save area to stack frame. */
487 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC)
488 mfmsr r11 /* get MSR value */
489 ori r11,r11,MSR_ME /* turn on ME bit */
490 ori r11,r11,MSR_RI /* turn on RI bit */
491 ld r12,PACAKBASE(r13) /* get high part of &label */
492 LOAD_HANDLER(r12, machine_check_handle_early)
496 b . /* prevent speculative execution */
497 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
499 machine_check_pSeries:
500 .globl machine_check_fwnmi
502 HMT_MEDIUM_PPR_DISCARD
503 SET_SCRATCH0(r13) /* save r13 */
504 EXCEPTION_PROLOG_0(PACA_EXMC)
505 machine_check_pSeries_0:
506 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200)
507 EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD)
508 KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
510 /* moved from 0x300 */
511 data_access_check_stab:
513 std r9,PACA_EXSLB+EX_R9(r13)
514 std r10,PACA_EXSLB+EX_R10(r13)
518 rlwimi r10,r9,16,0x20
519 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
520 lbz r9,HSTATE_IN_GUEST(r13)
521 rlwimi r10,r9,8,0x300
525 beq do_stab_bolted_pSeries
527 ld r9,PACA_EXSLB+EX_R9(r13)
528 ld r10,PACA_EXSLB+EX_R10(r13)
529 b data_access_not_stab
530 do_stab_bolted_pSeries:
531 std r11,PACA_EXSLB+EX_R11(r13)
532 std r12,PACA_EXSLB+EX_R12(r13)
534 std r10,PACA_EXSLB+EX_R13(r13)
535 EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD)
537 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
538 KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
539 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400)
540 KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480)
541 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900)
542 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
544 #ifdef CONFIG_PPC_DENORMALISATION
548 * To denormalise we need to move a copy of the register to itself.
549 * For POWER6 do that here for all FP regs.
552 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
553 xori r10,r10,(MSR_FE0|MSR_FE1)
557 #define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
558 #define FMR4(n) FMR2(n) ; FMR2(n+2)
559 #define FMR8(n) FMR4(n) ; FMR4(n+4)
560 #define FMR16(n) FMR8(n) ; FMR8(n+8)
561 #define FMR32(n) FMR16(n) ; FMR16(n+16)
566 * To denormalise we need to move a copy of the register to itself.
567 * For POWER7 do that here for the first 32 VSX registers only.
570 oris r10,r10,MSR_VSX@h
574 #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
575 #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
576 #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
577 #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
578 #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
581 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
585 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
587 * To denormalise we need to move a copy of the register to itself.
588 * For POWER8 we need to do that for all 64 VSX registers
594 ld r9,PACA_EXGEN+EX_R9(r13)
595 RESTORE_PPR_PACA(PACA_EXGEN, r10)
597 ld r10,PACA_EXGEN+EX_CFAR(r13)
599 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
600 ld r10,PACA_EXGEN+EX_R10(r13)
601 ld r11,PACA_EXGEN+EX_R11(r13)
602 ld r12,PACA_EXGEN+EX_R12(r13)
603 ld r13,PACA_EXGEN+EX_R13(r13)
609 /* moved from 0xe00 */
610 STD_EXCEPTION_HV_OOL(0xe02, h_data_storage)
611 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
612 STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage)
613 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
614 STD_EXCEPTION_HV_OOL(0xe42, emulation_assist)
615 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
616 STD_EXCEPTION_HV_OOL(0xe62, hmi_exception) /* need to flush cache ? */
617 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
618 MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell)
619 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
621 /* moved from 0xf00 */
622 STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
623 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00)
624 STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
625 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20)
626 STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
627 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
628 STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
629 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60)
630 STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable)
631 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82)
634 * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
635 * - If it was a decrementer interrupt, we bump the dec to max and and return.
636 * - If it was a doorbell we return immediately since doorbells are edge
637 * triggered and won't automatically refire.
638 * - else we hard disable and return.
639 * This is called with r10 containing the value to OR to the paca field.
641 #define MASKED_INTERRUPT(_H) \
642 masked_##_H##interrupt: \
643 std r11,PACA_EXGEN+EX_R11(r13); \
644 lbz r11,PACAIRQHAPPENED(r13); \
646 stb r11,PACAIRQHAPPENED(r13); \
647 cmpwi r10,PACA_IRQ_DEC; \
650 ori r10,r10,0xffff; \
651 mtspr SPRN_DEC,r10; \
653 1: cmpwi r10,PACA_IRQ_DBELL; \
655 mfspr r10,SPRN_##_H##SRR1; \
656 rldicl r10,r10,48,1; /* clear MSR_EE */ \
658 mtspr SPRN_##_H##SRR1,r10; \
660 ld r9,PACA_EXGEN+EX_R9(r13); \
661 ld r10,PACA_EXGEN+EX_R10(r13); \
662 ld r11,PACA_EXGEN+EX_R11(r13); \
671 * Called from arch_local_irq_enable when an interrupt needs
672 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
673 * which kind of interrupt. MSR:EE is already off. We generate a
674 * stackframe like if a real interrupt had happened.
676 * Note: While MSR:EE is off, we need to make sure that _MSR
677 * in the generated frame has EE set to 1 or the exception
678 * handler will not properly re-enable them.
680 _GLOBAL(__replay_interrupt)
681 /* We are going to jump to the exception common code which
682 * will retrieve various register values from the PACA which
683 * we don't give a damn about, so we don't bother storing them.
690 beq decrementer_common
692 beq hardware_interrupt_common
695 beq h_doorbell_common
698 beq doorbell_super_common
699 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
702 #ifdef CONFIG_PPC_PSERIES
704 * Vectors for the FWNMI option. Share common code.
706 .globl system_reset_fwnmi
709 HMT_MEDIUM_PPR_DISCARD
710 SET_SCRATCH0(r13) /* save r13 */
711 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
714 #endif /* CONFIG_PPC_PSERIES */
718 * This is used for when the SLB miss handler has to go virtual,
719 * which doesn't happen for now anymore but will once we re-implement
720 * dynamic VSIDs for shared page tables
722 slb_miss_user_pseries:
723 std r10,PACA_EXGEN+EX_R10(r13)
724 std r11,PACA_EXGEN+EX_R11(r13)
725 std r12,PACA_EXGEN+EX_R12(r13)
727 ld r11,PACA_EXSLB+EX_R9(r13)
728 ld r12,PACA_EXSLB+EX_R3(r13)
729 std r10,PACA_EXGEN+EX_R13(r13)
730 std r11,PACA_EXGEN+EX_R9(r13)
731 std r12,PACA_EXGEN+EX_R3(r13)
734 mfspr r11,SRR0 /* save SRR0 */
735 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
736 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
738 mfspr r12,SRR1 /* and SRR1 */
741 b . /* prevent spec. execution */
742 #endif /* __DISABLED__ */
744 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
745 kvmppc_skip_interrupt:
747 * Here all GPRs are unchanged from when the interrupt happened
748 * except for r13, which is saved in SPRG_SCRATCH0.
757 kvmppc_skip_Hinterrupt:
759 * Here all GPRs are unchanged from when the interrupt happened
760 * except for r13, which is saved in SPRG_SCRATCH0.
762 mfspr r13, SPRN_HSRR0
764 mtspr SPRN_HSRR0, r13
771 * Code from here down to __end_handlers is invoked from the
772 * exception prologs above. Because the prologs assemble the
773 * addresses of these handlers using the LOAD_HANDLER macro,
774 * which uses an ori instruction, these handlers must be in
775 * the first 64k of the kernel image.
778 /*** Common interrupt handlers ***/
780 STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
782 STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
783 STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt)
784 STD_EXCEPTION_COMMON(0x980, hdecrementer, .hdec_interrupt)
785 #ifdef CONFIG_PPC_DOORBELL
786 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .doorbell_exception)
788 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .unknown_exception)
790 STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
791 STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
792 STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
793 STD_EXCEPTION_COMMON(0xe40, emulation_assist, .emulation_assist_interrupt)
794 STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception)
795 #ifdef CONFIG_PPC_DOORBELL
796 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .doorbell_exception)
798 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .unknown_exception)
800 STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception)
801 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
802 STD_EXCEPTION_COMMON(0x1502, denorm, .unknown_exception)
803 #ifdef CONFIG_ALTIVEC
804 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
806 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
808 #ifdef CONFIG_CBE_RAS
809 STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception)
810 STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception)
811 STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception)
812 #endif /* CONFIG_CBE_RAS */
815 * Relocation-on interrupts: A subset of the interrupts can be delivered
816 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
817 * it. Addresses are the same as the original interrupt addresses, but
818 * offset by 0xc000000000004000.
819 * It's impossible to receive interrupts below 0x300 via this mechanism.
820 * KVM: None of these traps are from the guest ; anything that escalated
821 * to HV=1 from HV=0 is delivered via real mode handlers.
825 * This uses the standard macro, since the original 0x300 vector
826 * only has extra guff for STAB-based processors -- which never
829 STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access)
831 .globl data_access_slb_relon_pSeries
832 data_access_slb_relon_pSeries:
834 EXCEPTION_PROLOG_0(PACA_EXSLB)
835 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
836 std r3,PACA_EXSLB+EX_R3(r13)
839 #ifndef CONFIG_RELOCATABLE
843 * We can't just use a direct branch to .slb_miss_realmode
844 * because the distance from here to there depends on where
845 * the kernel ends up being put.
848 ld r10,PACAKBASE(r13)
849 LOAD_HANDLER(r10, .slb_miss_realmode)
854 STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access)
856 .globl instruction_access_slb_relon_pSeries
857 instruction_access_slb_relon_pSeries:
859 EXCEPTION_PROLOG_0(PACA_EXSLB)
860 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
861 std r3,PACA_EXSLB+EX_R3(r13)
862 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
864 #ifndef CONFIG_RELOCATABLE
868 ld r10,PACAKBASE(r13)
869 LOAD_HANDLER(r10, .slb_miss_realmode)
875 .globl hardware_interrupt_relon_pSeries;
876 .globl hardware_interrupt_relon_hv;
877 hardware_interrupt_relon_pSeries:
878 hardware_interrupt_relon_hv:
880 _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
882 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
883 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
884 STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
885 STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
886 STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
887 MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
888 STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
889 MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
890 STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
893 .globl system_call_relon_pSeries
894 system_call_relon_pSeries:
897 SYSCALL_PSERIES_2_DIRECT
900 STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step)
903 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
906 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
909 emulation_assist_relon_trampoline:
911 EXCEPTION_PROLOG_0(PACA_EXGEN)
912 b emulation_assist_relon_hv
915 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
918 h_doorbell_relon_trampoline:
920 EXCEPTION_PROLOG_0(PACA_EXGEN)
921 b h_doorbell_relon_hv
924 performance_monitor_relon_pseries_trampoline:
926 EXCEPTION_PROLOG_0(PACA_EXGEN)
927 b performance_monitor_relon_pSeries
930 altivec_unavailable_relon_pseries_trampoline:
932 EXCEPTION_PROLOG_0(PACA_EXGEN)
933 b altivec_unavailable_relon_pSeries
936 vsx_unavailable_relon_pseries_trampoline:
938 EXCEPTION_PROLOG_0(PACA_EXGEN)
939 b vsx_unavailable_relon_pSeries
942 facility_unavailable_relon_trampoline:
944 EXCEPTION_PROLOG_0(PACA_EXGEN)
945 b facility_unavailable_relon_pSeries
948 hv_facility_unavailable_relon_trampoline:
950 EXCEPTION_PROLOG_0(PACA_EXGEN)
951 b hv_facility_unavailable_relon_hv
953 STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
954 #ifdef CONFIG_PPC_DENORMALISATION
956 b denorm_exception_hv
958 STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist)
960 /* Other future vectors */
962 .globl __end_interrupts
966 system_call_entry_direct:
967 #if defined(CONFIG_RELOCATABLE)
968 /* The first level prologue may have used LR to get here, saving
969 * orig in r10. To save hacking/ifdeffing common code, restore here.
976 ppc64_runlatch_on_trampoline:
977 b .__ppc64_runlatch_on
980 * Here we have detected that the kernel stack pointer is bad.
981 * R9 contains the saved CR, r13 points to the paca,
982 * r10 contains the (bad) kernel stack pointer,
983 * r11 and r12 contain the saved SRR0 and SRR1.
984 * We switch to using an emergency stack, save the registers there,
985 * and call kernel_bad_stack(), which panics.
988 ld r1,PACAEMERGSP(r13)
989 subi r1,r1,64+INT_FRAME_SIZE
1021 std r10,ORIG_GPR3(r1)
1022 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1025 lhz r12,PACA_TRAP_SAVE(r13)
1027 addi r11,r1,INT_FRAME_SIZE
1032 ld r11,exception_marker@toc(r2)
1034 std r11,STACK_FRAME_OVERHEAD-16(r1)
1035 1: addi r3,r1,STACK_FRAME_OVERHEAD
1036 bl .kernel_bad_stack
1040 * Here r13 points to the paca, r9 contains the saved CR,
1041 * SRR0 and SRR1 are saved in r11 and r12,
1042 * r9 - r13 are saved in paca->exgen.
1045 .globl data_access_common
1048 std r10,PACA_EXGEN+EX_DAR(r13)
1049 mfspr r10,SPRN_DSISR
1050 stw r10,PACA_EXGEN+EX_DSISR(r13)
1051 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
1054 ld r3,PACA_EXGEN+EX_DAR(r13)
1055 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1057 b .do_hash_page /* Try to handle as hpte fault */
1060 .globl h_data_storage_common
1061 h_data_storage_common:
1063 std r10,PACA_EXGEN+EX_DAR(r13)
1064 mfspr r10,SPRN_HDSISR
1065 stw r10,PACA_EXGEN+EX_DSISR(r13)
1066 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
1069 addi r3,r1,STACK_FRAME_OVERHEAD
1070 bl .unknown_exception
1074 .globl instruction_access_common
1075 instruction_access_common:
1076 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
1080 andis. r4,r12,0x5820
1082 b .do_hash_page /* Try to handle as hpte fault */
1084 STD_EXCEPTION_COMMON(0xe20, h_instr_storage, .unknown_exception)
1087 * Here is the common SLB miss user that is used when going to virtual
1088 * mode for SLB misses, that is currently not used
1092 .globl slb_miss_user_common
1093 slb_miss_user_common:
1095 std r3,PACA_EXGEN+EX_DAR(r13)
1096 stw r9,PACA_EXGEN+EX_CCR(r13)
1097 std r10,PACA_EXGEN+EX_LR(r13)
1098 std r11,PACA_EXGEN+EX_SRR0(r13)
1099 bl .slb_allocate_user
1101 ld r10,PACA_EXGEN+EX_LR(r13)
1102 ld r3,PACA_EXGEN+EX_R3(r13)
1103 lwz r9,PACA_EXGEN+EX_CCR(r13)
1104 ld r11,PACA_EXGEN+EX_SRR0(r13)
1108 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1109 beq- unrecov_user_slb
1117 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
1123 ld r9,PACA_EXGEN+EX_R9(r13)
1124 ld r10,PACA_EXGEN+EX_R10(r13)
1125 ld r11,PACA_EXGEN+EX_R11(r13)
1126 ld r12,PACA_EXGEN+EX_R12(r13)
1127 ld r13,PACA_EXGEN+EX_R13(r13)
1132 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
1133 ld r4,PACA_EXGEN+EX_DAR(r13)
1140 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
1143 1: addi r3,r1,STACK_FRAME_OVERHEAD
1144 bl .unrecoverable_exception
1147 #endif /* __DISABLED__ */
1151 * Machine check is different because we use a different
1152 * save area: PACA_EXMC instead of PACA_EXGEN.
1155 .globl machine_check_common
1156 machine_check_common:
1159 std r10,PACA_EXGEN+EX_DAR(r13)
1160 mfspr r10,SPRN_DSISR
1161 stw r10,PACA_EXGEN+EX_DSISR(r13)
1162 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
1165 ld r3,PACA_EXGEN+EX_DAR(r13)
1166 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1170 addi r3,r1,STACK_FRAME_OVERHEAD
1171 bl .machine_check_exception
1175 .globl alignment_common
1178 std r10,PACA_EXGEN+EX_DAR(r13)
1179 mfspr r10,SPRN_DSISR
1180 stw r10,PACA_EXGEN+EX_DSISR(r13)
1181 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1182 ld r3,PACA_EXGEN+EX_DAR(r13)
1183 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1188 addi r3,r1,STACK_FRAME_OVERHEAD
1189 bl .alignment_exception
1193 .globl program_check_common
1194 program_check_common:
1195 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1198 addi r3,r1,STACK_FRAME_OVERHEAD
1199 bl .program_check_exception
1203 .globl fp_unavailable_common
1204 fp_unavailable_common:
1205 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1206 bne 1f /* if from user, just load it up */
1209 addi r3,r1,STACK_FRAME_OVERHEAD
1210 bl .kernel_fp_unavailable_exception
1213 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1215 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1216 * transaction), go do TM stuff
1218 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1220 END_FTR_SECTION_IFSET(CPU_FTR_TM)
1223 b fast_exception_return
1224 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1225 2: /* User process was in a transaction */
1228 addi r3,r1,STACK_FRAME_OVERHEAD
1229 bl .fp_unavailable_tm
1233 .globl altivec_unavailable_common
1234 altivec_unavailable_common:
1235 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1236 #ifdef CONFIG_ALTIVEC
1239 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1240 BEGIN_FTR_SECTION_NESTED(69)
1241 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1242 * transaction), go do TM stuff
1244 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1246 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1249 b fast_exception_return
1250 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1251 2: /* User process was in a transaction */
1254 addi r3,r1,STACK_FRAME_OVERHEAD
1255 bl .altivec_unavailable_tm
1259 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1263 addi r3,r1,STACK_FRAME_OVERHEAD
1264 bl .altivec_unavailable_exception
1268 .globl vsx_unavailable_common
1269 vsx_unavailable_common:
1270 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
1274 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1275 BEGIN_FTR_SECTION_NESTED(69)
1276 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1277 * transaction), go do TM stuff
1279 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1281 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1284 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1285 2: /* User process was in a transaction */
1288 addi r3,r1,STACK_FRAME_OVERHEAD
1289 bl .vsx_unavailable_tm
1293 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
1297 addi r3,r1,STACK_FRAME_OVERHEAD
1298 bl .vsx_unavailable_exception
1301 STD_EXCEPTION_COMMON(0xf60, facility_unavailable, .facility_unavailable_exception)
1302 STD_EXCEPTION_COMMON(0xf80, hv_facility_unavailable, .facility_unavailable_exception)
1305 .globl __end_handlers
1308 /* Equivalents to the above handlers for relocation-on interrupt vectors */
1309 STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
1310 MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell)
1312 STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
1313 STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
1314 STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
1315 STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
1316 STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_unavailable)
1318 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
1320 * Data area reserved for FWNMI option.
1321 * This address (0x7000) is fixed by the RPA.
1324 .globl fwnmi_data_area
1327 /* pseries and powernv need to keep the whole page from
1328 * 0x7000 to 0x8000 free for use by the firmware
1331 #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1333 /* Space for CPU0's segment table */
1339 #ifdef CONFIG_PPC_POWERNV
1340 _GLOBAL(opal_mc_secondary_handler)
1341 HMT_MEDIUM_PPR_DISCARD
1346 std r3,PACA_OPAL_MC_EVT(r13)
1347 ld r13,OPAL_MC_SRR0(r3)
1349 ld r13,OPAL_MC_SRR1(r3)
1351 ld r3,OPAL_MC_GPR3(r3)
1353 b machine_check_pSeries
1354 #endif /* CONFIG_PPC_POWERNV */
1357 #define MACHINE_CHECK_HANDLER_WINDUP \
1358 /* Clear MSR_RI before setting SRR0 and SRR1. */\
1360 mfmsr r9; /* get MSR value */ \
1362 mtmsrd r9,1; /* Clear MSR_RI */ \
1363 /* Move original SRR0 and SRR1 into the respective regs */ \
1365 mtspr SPRN_SRR1,r9; \
1367 mtspr SPRN_SRR0,r3; \
1375 REST_8GPRS(2, r1); \
1379 /* Decrement paca->in_mce. */ \
1380 lhz r12,PACA_IN_MCE(r13); \
1382 sth r12,PACA_IN_MCE(r13); \
1384 REST_2GPRS(12, r1); \
1385 /* restore original r1. */ \
1389 * Handle machine check early in real mode. We come here with
1390 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack.
1393 .globl machine_check_handle_early
1394 machine_check_handle_early:
1395 std r0,GPR0(r1) /* Save r0 */
1396 EXCEPTION_PROLOG_COMMON_3(0x200)
1398 addi r3,r1,STACK_FRAME_OVERHEAD
1399 bl .machine_check_early
1401 #ifdef CONFIG_PPC_P7_NAP
1403 * Check if thread was in power saving mode. We come here when any
1404 * of the following is true:
1405 * a. thread wasn't in power saving mode
1406 * b. thread was in power saving mode with no state loss or
1407 * supervisor state loss
1409 * Go back to nap again if (b) is true.
1411 rlwinm. r11,r12,47-31,30,31 /* Was it in power saving mode? */
1412 beq 4f /* No, it wasn;t */
1413 /* Thread was in power saving mode. Go back to nap again. */
1416 /* Supervisor state loss */
1418 stb r0,PACA_NAPSTATELOST(r13)
1419 3: bl .machine_check_queue_event
1420 MACHINE_CHECK_HANDLER_WINDUP
1423 b .power7_enter_nap_mode
1427 * Check if we are coming from hypervisor userspace. If yes then we
1428 * continue in host kernel in V mode to deliver the MC event.
1430 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */
1432 andi. r11,r12,MSR_PR /* See if coming from user. */
1433 bne 9f /* continue in V mode if we are. */
1436 #ifdef CONFIG_KVM_BOOK3S_64_HV
1438 * We are coming from kernel context. Check if we are coming from
1439 * guest. if yes, then we can continue. We will fall through
1440 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest.
1442 lbz r11,HSTATE_IN_GUEST(r13)
1443 cmpwi r11,0 /* Check if coming from guest */
1444 bne 9f /* continue if we are. */
1447 * At this point we are not sure about what context we come from.
1448 * Queue up the MCE event and return from the interrupt.
1449 * But before that, check if this is an un-recoverable exception.
1450 * If yes, then stay on emergency stack and panic.
1452 andi. r11,r12,MSR_RI
1454 1: addi r3,r1,STACK_FRAME_OVERHEAD
1455 bl .unrecoverable_exception
1459 * Return from MC interrupt.
1460 * Queue up the MCE event so that we can log it later, while
1461 * returning from kernel or opal call.
1463 bl .machine_check_queue_event
1464 MACHINE_CHECK_HANDLER_WINDUP
1467 /* Deliver the machine check to host kernel in V mode. */
1468 MACHINE_CHECK_HANDLER_WINDUP
1469 b machine_check_pSeries
1472 * r13 points to the PACA, r9 contains the saved CR,
1473 * r12 contain the saved SRR1, SRR0 is still ready for return
1474 * r3 has the faulting address
1475 * r9 - r13 are saved in paca->exslb.
1476 * r3 is saved in paca->slb_r3
1477 * We assume we aren't going to take any exceptions during this procedure.
1479 _GLOBAL(slb_miss_realmode)
1481 #ifdef CONFIG_RELOCATABLE
1485 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1486 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
1488 bl .slb_allocate_realmode
1490 /* All done -- return from exception. */
1492 ld r10,PACA_EXSLB+EX_LR(r13)
1493 ld r3,PACA_EXSLB+EX_R3(r13)
1494 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1498 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1504 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
1507 RESTORE_PPR_PACA(PACA_EXSLB, r9)
1508 ld r9,PACA_EXSLB+EX_R9(r13)
1509 ld r10,PACA_EXSLB+EX_R10(r13)
1510 ld r11,PACA_EXSLB+EX_R11(r13)
1511 ld r12,PACA_EXSLB+EX_R12(r13)
1512 ld r13,PACA_EXSLB+EX_R13(r13)
1514 b . /* prevent speculative execution */
1516 2: mfspr r11,SPRN_SRR0
1517 ld r10,PACAKBASE(r13)
1518 LOAD_HANDLER(r10,unrecov_slb)
1520 ld r10,PACAKMSR(r13)
1526 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1529 1: addi r3,r1,STACK_FRAME_OVERHEAD
1530 bl .unrecoverable_exception
1534 #ifdef CONFIG_PPC_970_NAP
1537 std r9,TI_LOCAL_FLAGS(r11)
1538 ld r10,_LINK(r1) /* make idle task do the */
1539 std r10,_NIP(r1) /* equivalent of a blr */
1547 _STATIC(do_hash_page)
1551 andis. r0,r4,0xa410 /* weird error? */
1552 bne- handle_page_fault /* if not, try to insert a HPTE */
1553 andis. r0,r4,DSISR_DABRMATCH@h
1554 bne- handle_dabr_fault
1557 andis. r0,r4,0x0020 /* Is it a segment table fault? */
1558 bne- do_ste_alloc /* If so handle it */
1559 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
1561 CURRENT_THREAD_INFO(r11, r1)
1562 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
1563 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
1564 bne 77f /* then don't call hash_page now */
1566 * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1567 * accessing a userspace segment (even from the kernel). We assume
1568 * kernel addresses always have the high bit set.
1570 rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1571 rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
1572 orc r0,r12,r0 /* MSR_PR | ~high_bit */
1573 rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
1574 ori r4,r4,1 /* add _PAGE_PRESENT */
1575 rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
1578 * r3 contains the faulting address
1579 * r4 contains the required access permissions
1580 * r5 contains the trap number
1582 * at return r3 = 0 for success, 1 for page fault, negative for error
1584 bl .hash_page /* build HPTE if possible */
1585 cmpdi r3,0 /* see if hash_page succeeded */
1588 beq fast_exc_return_irq /* Return from exception on success */
1593 /* Here we have a page fault that hash_page can't handle. */
1597 addi r3,r1,STACK_FRAME_OVERHEAD
1603 addi r3,r1,STACK_FRAME_OVERHEAD
1608 /* We have a data breakpoint exception - handle it */
1613 addi r3,r1,STACK_FRAME_OVERHEAD
1615 12: b .ret_from_except_lite
1618 /* We have a page fault that hash_page could handle but HV refused
1623 addi r3,r1,STACK_FRAME_OVERHEAD
1629 * We come here as a result of a DSI at a point where we don't want
1630 * to call hash_page, such as when we are accessing memory (possibly
1631 * user memory) inside a PMU interrupt that occurred while interrupts
1632 * were soft-disabled. We want to invoke the exception handler for
1633 * the access, or panic if there isn't a handler.
1637 addi r3,r1,STACK_FRAME_OVERHEAD
1642 /* here we have a segment miss */
1644 bl .ste_allocate /* try to insert stab entry */
1646 bne- handle_page_fault
1647 b fast_exception_return
1650 * r13 points to the PACA, r9 contains the saved CR,
1651 * r11 and r12 contain the saved SRR0 and SRR1.
1652 * r9 - r13 are saved in paca->exslb.
1653 * We assume we aren't going to take any exceptions during this procedure.
1654 * We assume (DAR >> 60) == 0xc.
1657 _GLOBAL(do_stab_bolted)
1658 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1659 std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */
1660 mfspr r11,SPRN_DAR /* ea */
1663 * check for bad kernel/user address
1664 * (ea & ~REGION_MASK) >= PGTABLE_RANGE
1666 rldicr. r9,r11,4,(63 - 46 - 4)
1667 li r9,0 /* VSID = 0 for bad address */
1672 * This is the kernel vsid, we take the top for context from
1673 * the range. context = (MAX_USER_CONTEXT) + ((ea >> 60) - 0xc) + 1
1674 * Here we know that (ea >> 60) == 0xc
1676 lis r9,(MAX_USER_CONTEXT + 1)@ha
1677 addi r9,r9,(MAX_USER_CONTEXT + 1)@l
1679 srdi r10,r11,SID_SHIFT
1680 rldimi r10,r9,ESID_BITS,0 /* proto vsid */
1681 ASM_VSID_SCRAMBLE(r10, r9, 256M)
1682 rldic r9,r10,12,16 /* r9 = vsid << 12 */
1685 /* Hash to the primary group */
1686 ld r10,PACASTABVIRT(r13)
1687 srdi r11,r11,SID_SHIFT
1688 rldimi r10,r11,7,52 /* r10 = first ste of the group */
1690 /* Search the primary group for a free entry */
1691 1: ld r11,0(r10) /* Test valid bit of the current ste */
1698 /* Stick for only searching the primary group for now. */
1699 /* At least for now, we use a very simple random castout scheme */
1700 /* Use the TB as a random number ; OR in 1 to avoid entry 0 */
1702 rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */
1705 /* r10 currently points to an ste one past the group of interest */
1706 /* make it point to the randomly selected entry */
1708 or r10,r10,r11 /* r10 is the entry to invalidate */
1710 isync /* mark the entry invalid */
1712 rldicl r11,r11,56,1 /* clear the valid bit */
1717 clrrdi r11,r11,28 /* Get the esid part of the ste */
1720 2: std r9,8(r10) /* Store the vsid part of the ste */
1723 mfspr r11,SPRN_DAR /* Get the new esid */
1724 clrrdi r11,r11,28 /* Permits a full 32b of ESID */
1725 ori r11,r11,0x90 /* Turn on valid and kp */
1726 std r11,0(r10) /* Put new entry back into the stab */
1730 /* All done -- return from exception. */
1731 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1732 ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */
1734 andi. r10,r12,MSR_RI
1737 mtcrf 0x80,r9 /* restore CR */
1745 ld r9,PACA_EXSLB+EX_R9(r13)
1746 ld r10,PACA_EXSLB+EX_R10(r13)
1747 ld r11,PACA_EXSLB+EX_R11(r13)
1748 ld r12,PACA_EXSLB+EX_R12(r13)
1749 ld r13,PACA_EXSLB+EX_R13(r13)
1751 b . /* prevent speculative execution */