1 /* SPDX-License-Identifier: GPL-2.0 */
3 * This file contains the 64-bit "server" PowerPC variant
4 * of the low level exception handling including exception
5 * vectors, exception return, part of the slb and stab
6 * handling and other fixed offset specific things.
8 * This file is meant to be #included from head_64.S due to
9 * position dependent assembly.
11 * Most of this originates from head_64.S and thus has the same
16 #include <asm/hw_irq.h>
17 #include <asm/exception-64s.h>
18 #include <asm/ptrace.h>
19 #include <asm/cpuidle.h>
20 #include <asm/head-64.h>
21 #include <asm/feature-fixups.h>
24 * There are a few constraints to be concerned with.
25 * - Real mode exceptions code/data must be located at their physical location.
26 * - Virtual mode exceptions must be mapped at their 0xc000... location.
27 * - Fixed location code must not call directly beyond the __end_interrupts
28 * area when built with CONFIG_RELOCATABLE. LOAD_HANDLER / bctr sequence
30 * - LOAD_HANDLER targets must be within first 64K of physical 0 /
32 * - Conditional branch targets must be within +/-32K of caller.
34 * "Virtual exceptions" run with relocation on (MSR_IR=1, MSR_DR=1), and
35 * therefore don't have to run in physically located code or rfid to
36 * virtual mode kernel code. However on relocatable kernels they do have
37 * to branch to KERNELBASE offset because the rest of the kernel (outside
38 * the exception vectors) may be located elsewhere.
40 * Virtual exceptions correspond with physical, except their entry points
41 * are offset by 0xc000000000000000 and also tend to get an added 0x4000
42 * offset applied. Virtual exceptions are enabled with the Alternate
43 * Interrupt Location (AIL) bit set in the LPCR. However this does not
44 * guarantee they will be delivered virtually. Some conditions (see the ISA)
45 * cause exceptions to be delivered in real mode.
47 * It's impossible to receive interrupts below 0x300 via AIL.
49 * KVM: None of the virtual exceptions are from the guest. Anything that
50 * escalated to HV=1 from HV=0 is delivered via real mode handlers.
53 * We layout physical memory as follows:
54 * 0x0000 - 0x00ff : Secondary processor spin code
55 * 0x0100 - 0x18ff : Real mode pSeries interrupt vectors
56 * 0x1900 - 0x3fff : Real mode trampolines
57 * 0x4000 - 0x58ff : Relon (IR=1,DR=1) mode pSeries interrupt vectors
58 * 0x5900 - 0x6fff : Relon mode trampolines
59 * 0x7000 - 0x7fff : FWNMI data area
60 * 0x8000 - .... : Common interrupt handlers, remaining early
61 * setup code, rest of kernel.
63 * We could reclaim 0x4000-0x42ff for real mode trampolines if the space
64 * is necessary. Until then it's more consistent to explicitly put VIRT_NONE
67 OPEN_FIXED_SECTION(real_vectors, 0x0100, 0x1900)
68 OPEN_FIXED_SECTION(real_trampolines, 0x1900, 0x4000)
69 OPEN_FIXED_SECTION(virt_vectors, 0x4000, 0x5900)
70 OPEN_FIXED_SECTION(virt_trampolines, 0x5900, 0x7000)
71 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
73 * Data area reserved for FWNMI option.
74 * This address (0x7000) is fixed by the RPA.
75 * pseries and powernv need to keep the whole page from
76 * 0x7000 to 0x8000 free for use by the firmware
78 ZERO_FIXED_SECTION(fwnmi_page, 0x7000, 0x8000)
79 OPEN_TEXT_SECTION(0x8000)
81 OPEN_TEXT_SECTION(0x7000)
84 USE_FIXED_SECTION(real_vectors)
87 * This is the start of the interrupt handlers for pSeries
88 * This code runs with relocation off.
89 * Code from here to __end_interrupts gets copied down to real
90 * address 0x100 when we are running a relocatable kernel.
91 * Therefore any relative branches in this section must only
92 * branch to labels in this section.
94 .globl __start_interrupts
97 /* No virt vectors corresponding with 0x0..0x100 */
98 EXC_VIRT_NONE(0x4000, 0x100)
101 #ifdef CONFIG_PPC_P7_NAP
103 * If running native on arch 2.06 or later, check if we are waking up
104 * from nap/sleep/winkle, and branch to idle handler. This tests SRR1
105 * bits 46:47. A non-0 value indicates that we are coming from a power
106 * saving state. The idle wakeup handler initially runs in real mode,
107 * but we branch to the 0xc000... address so we can turn on relocation
110 #define IDLETEST(n) \
111 BEGIN_FTR_SECTION ; \
112 mfspr r10,SPRN_SRR1 ; \
113 rlwinm. r10,r10,47-31,30,31 ; \
116 BRANCH_TO_C000(r10, system_reset_idle_common) ; \
119 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
121 #define IDLETEST NOTEST
124 EXC_REAL_BEGIN(system_reset, 0x100, 0x100)
127 * MSR_RI is not enabled, because PACA_EXNMI and nmi stack is
128 * being used, so a nested NMI exception would corrupt it.
130 EXCEPTION_PROLOG_NORI(PACA_EXNMI, system_reset_common, EXC_STD,
133 EXC_REAL_END(system_reset, 0x100, 0x100)
134 EXC_VIRT_NONE(0x4100, 0x100)
135 TRAMP_KVM(PACA_EXNMI, 0x100)
137 #ifdef CONFIG_PPC_P7_NAP
138 EXC_COMMON_BEGIN(system_reset_idle_common)
140 b pnv_powersave_wakeup
144 * Set IRQS_ALL_DISABLED unconditionally so arch_irqs_disabled does
145 * the right thing. We do not want to reconcile because that goes
146 * through irq tracing which we don't want in NMI.
148 * Save PACAIRQHAPPENED because some code will do a hard disable
149 * (e.g., xmon). So we want to restore this back to where it was
150 * when we return. DAR is unused in the stack, so save it there.
152 #define ADD_RECONCILE_NMI \
153 li r10,IRQS_ALL_DISABLED; \
154 stb r10,PACAIRQSOFTMASK(r13); \
155 lbz r10,PACAIRQHAPPENED(r13); \
158 EXC_COMMON_BEGIN(system_reset_common)
160 * Increment paca->in_nmi then enable MSR_RI. SLB or MCE will be able
161 * to recover, but nested NMI will notice in_nmi and not recover
162 * because of the use of the NMI stack. in_nmi reentrancy is tested in
163 * system_reset_exception.
165 lhz r10,PACA_IN_NMI(r13)
167 sth r10,PACA_IN_NMI(r13)
172 ld r1,PACA_NMI_EMERG_SP(r13)
173 subi r1,r1,INT_FRAME_SIZE
174 EXCEPTION_COMMON_NORET_STACK(PACA_EXNMI, 0x100,
175 system_reset, system_reset_exception,
176 ADD_NVGPRS;ADD_RECONCILE_NMI)
178 /* This (and MCE) can be simplified with mtmsrd L=1 */
179 /* Clear MSR_RI before setting SRR0 and SRR1. */
186 * MSR_RI is clear, now we can decrement paca->in_nmi.
188 lhz r10,PACA_IN_NMI(r13)
190 sth r10,PACA_IN_NMI(r13)
193 * Restore soft mask settings.
196 stb r10,PACAIRQHAPPENED(r13)
198 stb r10,PACAIRQSOFTMASK(r13)
201 * Keep below code in synch with MACHINE_CHECK_HANDLER_WINDUP.
202 * Should share common bits...
205 /* Move original SRR0 and SRR1 into the respective regs */
223 /* restore original r1. */
225 RFI_TO_USER_OR_KERNEL
227 #ifdef CONFIG_PPC_PSERIES
229 * Vectors for the FWNMI option. Share common code.
231 TRAMP_REAL_BEGIN(system_reset_fwnmi)
232 SET_SCRATCH0(r13) /* save r13 */
233 /* See comment at system_reset exception */
234 EXCEPTION_PROLOG_NORI(PACA_EXNMI, system_reset_common, EXC_STD,
236 #endif /* CONFIG_PPC_PSERIES */
239 EXC_REAL_BEGIN(machine_check, 0x200, 0x100)
240 /* This is moved out of line as it can be patched by FW, but
241 * some code path might still want to branch into the original
244 SET_SCRATCH0(r13) /* save r13 */
245 EXCEPTION_PROLOG_0(PACA_EXMC)
247 b machine_check_common_early
249 b machine_check_pSeries_0
250 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
251 EXC_REAL_END(machine_check, 0x200, 0x100)
252 EXC_VIRT_NONE(0x4200, 0x100)
253 TRAMP_REAL_BEGIN(machine_check_common_early)
254 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
259 * Original R9 to R13 is saved on PACA_EXMC
261 * Switch to mc_emergency stack and handle re-entrancy (we limit
262 * the nested MCE upto level 4 to avoid stack overflow).
263 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1
265 * We use paca->in_mce to check whether this is the first entry or
266 * nested machine check. We increment paca->in_mce to track nested
269 * If this is the first entry then set stack pointer to
270 * paca->mc_emergency_sp, otherwise r1 is already pointing to
271 * stack frame on mc_emergency stack.
273 * NOTE: We are here with MSR_ME=0 (off), which means we risk a
274 * checkstop if we get another machine check exception before we do
275 * rfid with MSR_ME=1.
277 * This interrupt can wake directly from idle. If that is the case,
278 * the machine check is handled then the idle wakeup code is called
281 mr r11,r1 /* Save r1 */
282 lhz r10,PACA_IN_MCE(r13)
283 cmpwi r10,0 /* Are we in nested machine check */
284 bne 0f /* Yes, we are. */
285 /* First machine check entry */
286 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
287 0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
288 addi r10,r10,1 /* increment paca->in_mce */
289 sth r10,PACA_IN_MCE(r13)
290 /* Limit nested MCE to level 4 to avoid stack overflow */
291 cmpwi r10,MAX_MCE_DEPTH
292 bgt 2f /* Check if we hit limit of 4 */
293 std r11,GPR1(r1) /* Save r1 on the stack. */
294 std r11,0(r1) /* make stack chain pointer */
295 mfspr r11,SPRN_SRR0 /* Save SRR0 */
297 mfspr r11,SPRN_SRR1 /* Save SRR1 */
299 mfspr r11,SPRN_DAR /* Save DAR */
301 mfspr r11,SPRN_DSISR /* Save DSISR */
303 std r9,_CCR(r1) /* Save CR in stackframe */
304 /* Save r9 through r13 from EXMC save area to stack frame. */
305 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC)
306 mfmsr r11 /* get MSR value */
308 ori r11,r11,MSR_ME /* turn on ME bit */
309 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
310 ori r11,r11,MSR_RI /* turn on RI bit */
311 LOAD_HANDLER(r12, machine_check_handle_early)
312 1: mtspr SPRN_SRR0,r12
315 b . /* prevent speculative execution */
317 /* Stack overflow. Stay on emergency stack and panic.
318 * Keep the ME bit off while panic-ing, so that if we hit
319 * another machine check we checkstop.
321 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */
323 LOAD_HANDLER(r12, unrecover_mce)
325 andc r11,r11,r10 /* Turn off MSR_ME */
327 b . /* prevent speculative execution */
329 TRAMP_REAL_BEGIN(machine_check_pSeries)
330 .globl machine_check_fwnmi
332 SET_SCRATCH0(r13) /* save r13 */
333 EXCEPTION_PROLOG_0(PACA_EXMC)
335 b machine_check_common_early
336 END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE)
337 machine_check_pSeries_0:
338 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200)
340 * MSR_RI is not enabled, because PACA_EXMC is being used, so a
341 * nested machine check corrupts it. machine_check_common enables
344 EXCEPTION_PROLOG_2_NORI(machine_check_common, EXC_STD)
346 TRAMP_KVM_SKIP(PACA_EXMC, 0x200)
348 EXC_COMMON_BEGIN(machine_check_common)
350 * Machine check is different because we use a different
351 * save area: PACA_EXMC instead of PACA_EXGEN.
354 std r10,PACA_EXMC+EX_DAR(r13)
356 stw r10,PACA_EXMC+EX_DSISR(r13)
357 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
359 RECONCILE_IRQ_STATE(r10, r11)
360 ld r3,PACA_EXMC+EX_DAR(r13)
361 lwz r4,PACA_EXMC+EX_DSISR(r13)
362 /* Enable MSR_RI when finished with PACA_EXMC */
368 addi r3,r1,STACK_FRAME_OVERHEAD
369 bl machine_check_exception
372 #define MACHINE_CHECK_HANDLER_WINDUP \
373 /* Clear MSR_RI before setting SRR0 and SRR1. */\
375 mfmsr r9; /* get MSR value */ \
377 mtmsrd r9,1; /* Clear MSR_RI */ \
378 /* Move original SRR0 and SRR1 into the respective regs */ \
380 mtspr SPRN_SRR1,r9; \
382 mtspr SPRN_SRR0,r3; \
394 /* Decrement paca->in_mce. */ \
395 lhz r12,PACA_IN_MCE(r13); \
397 sth r12,PACA_IN_MCE(r13); \
399 REST_2GPRS(12, r1); \
400 /* restore original r1. */ \
403 #ifdef CONFIG_PPC_P7_NAP
405 * This is an idle wakeup. Low level machine check has already been
406 * done. Queue the event then call the idle code to do the wake up.
408 EXC_COMMON_BEGIN(machine_check_idle_common)
409 bl machine_check_queue_event
412 * We have not used any non-volatile GPRs here, and as a rule
413 * most exception code including machine check does not.
414 * Therefore PACA_NAPSTATELOST does not need to be set. Idle
415 * wakeup will restore volatile registers.
417 * Load the original SRR1 into r3 for pnv_powersave_wakeup_mce.
419 * Then decrement MCE nesting after finishing with the stack.
423 lhz r11,PACA_IN_MCE(r13)
425 sth r11,PACA_IN_MCE(r13)
427 /* Turn off the RI bit because SRR1 is used by idle wakeup code. */
428 /* Recoverability could be improved by reducing the use of SRR1. */
432 b pnv_powersave_wakeup_mce
435 * Handle machine check early in real mode. We come here with
436 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack.
438 EXC_COMMON_BEGIN(machine_check_handle_early)
439 std r0,GPR0(r1) /* Save r0 */
440 EXCEPTION_PROLOG_COMMON_3(0x200)
442 addi r3,r1,STACK_FRAME_OVERHEAD
443 bl machine_check_early
444 std r3,RESULT(r1) /* Save result */
448 END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE)
450 #ifdef CONFIG_PPC_P7_NAP
452 * Check if thread was in power saving mode. We come here when any
453 * of the following is true:
454 * a. thread wasn't in power saving mode
455 * b. thread was in power saving mode with no state loss,
456 * supervisor state loss or hypervisor state loss.
458 * Go back to nap/sleep/winkle mode again if (b) is true.
461 rlwinm. r11,r12,47-31,30,31
462 bne machine_check_idle_common
463 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
467 * Check if we are coming from hypervisor userspace. If yes then we
468 * continue in host kernel in V mode to deliver the MC event.
470 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */
472 4: andi. r11,r12,MSR_PR /* See if coming from user. */
473 bne 9f /* continue in V mode if we are. */
476 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
479 * We are coming from kernel context. Check if we are coming from
480 * guest. if yes, then we can continue. We will fall through
481 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest.
483 lbz r11,HSTATE_IN_GUEST(r13)
484 cmpwi r11,0 /* Check if coming from guest */
485 bne 9f /* continue if we are. */
486 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
489 * At this point we are not sure about what context we come from.
490 * Queue up the MCE event and return from the interrupt.
491 * But before that, check if this is an un-recoverable exception.
492 * If yes, then stay on emergency stack and panic.
496 1: mfspr r11,SPRN_SRR0
497 LOAD_HANDLER(r10,unrecover_mce)
501 * We are going down. But there are chances that we might get hit by
502 * another MCE during panic path and we may run into unstable state
503 * with no way out. Hence, turn ME bit off while going down, so that
504 * when another MCE is hit during panic path, system will checkstop
505 * and hypervisor will get restarted cleanly by SP.
508 andc r10,r10,r3 /* Turn off MSR_ME */
514 * Check if we have successfully handled/recovered from error, if not
515 * then stay on emergency stack and panic.
517 ld r3,RESULT(r1) /* Load result */
518 cmpdi r3,0 /* see if we handled MCE successfully */
520 beq 1b /* if !handled then panic */
523 * Return from MC interrupt.
524 * Queue up the MCE event so that we can log it later, while
525 * returning from kernel or opal call.
527 bl machine_check_queue_event
528 MACHINE_CHECK_HANDLER_WINDUP
529 RFI_TO_USER_OR_KERNEL
532 * pSeries: Return from MC interrupt. Before that stay on emergency
533 * stack and call machine_check_exception to log the MCE event.
535 LOAD_HANDLER(r10,mce_return)
541 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
543 /* Deliver the machine check to host kernel in V mode. */
544 MACHINE_CHECK_HANDLER_WINDUP
545 SET_SCRATCH0(r13) /* save r13 */
546 EXCEPTION_PROLOG_0(PACA_EXMC)
547 b machine_check_pSeries_0
549 EXC_COMMON_BEGIN(unrecover_mce)
550 /* Invoke machine_check_exception to print MCE event and panic. */
551 addi r3,r1,STACK_FRAME_OVERHEAD
552 bl machine_check_exception
554 * We will not reach here. Even if we did, there is no way out. Call
555 * unrecoverable_exception and die.
557 1: addi r3,r1,STACK_FRAME_OVERHEAD
558 bl unrecoverable_exception
561 EXC_COMMON_BEGIN(mce_return)
562 /* Invoke machine_check_exception to print MCE event and return. */
563 addi r3,r1,STACK_FRAME_OVERHEAD
564 bl machine_check_exception
565 MACHINE_CHECK_HANDLER_WINDUP
569 EXC_REAL(data_access, 0x300, 0x80)
570 EXC_VIRT(data_access, 0x4300, 0x80, 0x300)
571 TRAMP_KVM_SKIP(PACA_EXGEN, 0x300)
573 EXC_COMMON_BEGIN(data_access_common)
575 * Here r13 points to the paca, r9 contains the saved CR,
576 * SRR0 and SRR1 are saved in r11 and r12,
577 * r9 - r13 are saved in paca->exgen.
580 std r10,PACA_EXGEN+EX_DAR(r13)
582 stw r10,PACA_EXGEN+EX_DSISR(r13)
583 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
584 RECONCILE_IRQ_STATE(r10, r11)
586 ld r3,PACA_EXGEN+EX_DAR(r13)
587 lwz r4,PACA_EXGEN+EX_DSISR(r13)
591 BEGIN_MMU_FTR_SECTION
592 b do_hash_page /* Try to handle as hpte fault */
595 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
598 EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80)
599 EXCEPTION_PROLOG(PACA_EXSLB, data_access_slb_common, EXC_STD, KVMTEST_PR, 0x380);
600 EXC_REAL_END(data_access_slb, 0x380, 0x80)
602 EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80)
603 EXCEPTION_RELON_PROLOG(PACA_EXSLB, data_access_slb_common, EXC_STD, NOTEST, 0x380);
604 EXC_VIRT_END(data_access_slb, 0x4380, 0x80)
606 TRAMP_KVM_SKIP(PACA_EXSLB, 0x380)
608 EXC_COMMON_BEGIN(data_access_slb_common)
610 std r10,PACA_EXSLB+EX_DAR(r13)
611 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXSLB)
612 ld r4,PACA_EXSLB+EX_DAR(r13)
614 addi r3,r1,STACK_FRAME_OVERHEAD
618 b fast_exception_return
622 RECONCILE_IRQ_STATE(r10, r11)
625 addi r3,r1,STACK_FRAME_OVERHEAD
630 EXC_REAL(instruction_access, 0x400, 0x80)
631 EXC_VIRT(instruction_access, 0x4400, 0x80, 0x400)
632 TRAMP_KVM(PACA_EXGEN, 0x400)
634 EXC_COMMON_BEGIN(instruction_access_common)
635 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
636 RECONCILE_IRQ_STATE(r10, r11)
639 andis. r4,r12,DSISR_SRR1_MATCH_64S@h
643 BEGIN_MMU_FTR_SECTION
644 b do_hash_page /* Try to handle as hpte fault */
647 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
650 EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80)
651 EXCEPTION_PROLOG(PACA_EXSLB, instruction_access_slb_common, EXC_STD, KVMTEST_PR, 0x480);
652 EXC_REAL_END(instruction_access_slb, 0x480, 0x80)
654 EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80)
655 EXCEPTION_RELON_PROLOG(PACA_EXSLB, instruction_access_slb_common, EXC_STD, NOTEST, 0x480);
656 EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80)
658 TRAMP_KVM(PACA_EXSLB, 0x480)
660 EXC_COMMON_BEGIN(instruction_access_slb_common)
661 EXCEPTION_PROLOG_COMMON(0x480, PACA_EXSLB)
663 addi r3,r1,STACK_FRAME_OVERHEAD
667 b fast_exception_return
671 RECONCILE_IRQ_STATE(r10, r11)
674 addi r3,r1,STACK_FRAME_OVERHEAD
679 EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100)
680 .globl hardware_interrupt_hv;
681 hardware_interrupt_hv:
683 MASKABLE_EXCEPTION_HV(0x500, hardware_interrupt_common, IRQS_DISABLED)
685 MASKABLE_EXCEPTION(0x500, hardware_interrupt_common, IRQS_DISABLED)
686 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
687 EXC_REAL_END(hardware_interrupt, 0x500, 0x100)
689 EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100)
690 .globl hardware_interrupt_relon_hv;
691 hardware_interrupt_relon_hv:
693 MASKABLE_RELON_EXCEPTION_HV(0x500, hardware_interrupt_common,
696 __MASKABLE_RELON_EXCEPTION(0x500, hardware_interrupt_common,
697 EXC_STD, SOFTEN_TEST_PR, IRQS_DISABLED)
698 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
699 EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100)
701 TRAMP_KVM(PACA_EXGEN, 0x500)
702 TRAMP_KVM_HV(PACA_EXGEN, 0x500)
703 EXC_COMMON_ASYNC(hardware_interrupt_common, 0x500, do_IRQ)
706 EXC_REAL(alignment, 0x600, 0x100)
707 EXC_VIRT(alignment, 0x4600, 0x100, 0x600)
708 TRAMP_KVM(PACA_EXGEN, 0x600)
709 EXC_COMMON_BEGIN(alignment_common)
711 std r10,PACA_EXGEN+EX_DAR(r13)
713 stw r10,PACA_EXGEN+EX_DSISR(r13)
714 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
715 ld r3,PACA_EXGEN+EX_DAR(r13)
716 lwz r4,PACA_EXGEN+EX_DSISR(r13)
720 RECONCILE_IRQ_STATE(r10, r11)
721 addi r3,r1,STACK_FRAME_OVERHEAD
722 bl alignment_exception
726 EXC_REAL(program_check, 0x700, 0x100)
727 EXC_VIRT(program_check, 0x4700, 0x100, 0x700)
728 TRAMP_KVM(PACA_EXGEN, 0x700)
729 EXC_COMMON_BEGIN(program_check_common)
731 * It's possible to receive a TM Bad Thing type program check with
732 * userspace register values (in particular r1), but with SRR1 reporting
733 * that we came from the kernel. Normally that would confuse the bad
734 * stack logic, and we would report a bad kernel stack pointer. Instead
735 * we switch to the emergency stack if we're taking a TM Bad Thing from
738 li r10,MSR_PR /* Build a mask of MSR_PR .. */
739 oris r10,r10,0x200000@h /* .. and SRR1_PROGTM */
740 and r10,r10,r12 /* Mask SRR1 with that. */
741 srdi r10,r10,8 /* Shift it so we can compare */
742 cmpldi r10,(0x200000 >> 8) /* .. with an immediate. */
743 bne 1f /* If != go to normal path. */
745 /* SRR1 had PR=0 and SRR1_PROGTM=1, so use the emergency stack */
746 andi. r10,r12,MSR_PR; /* Set CR0 correctly for label */
747 /* 3 in EXCEPTION_PROLOG_COMMON */
748 mr r10,r1 /* Save r1 */
749 ld r1,PACAEMERGSP(r13) /* Use emergency stack */
750 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
751 b 3f /* Jump into the macro !! */
752 1: EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
754 RECONCILE_IRQ_STATE(r10, r11)
755 addi r3,r1,STACK_FRAME_OVERHEAD
756 bl program_check_exception
760 EXC_REAL(fp_unavailable, 0x800, 0x100)
761 EXC_VIRT(fp_unavailable, 0x4800, 0x100, 0x800)
762 TRAMP_KVM(PACA_EXGEN, 0x800)
763 EXC_COMMON_BEGIN(fp_unavailable_common)
764 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
765 bne 1f /* if from user, just load it up */
767 RECONCILE_IRQ_STATE(r10, r11)
768 addi r3,r1,STACK_FRAME_OVERHEAD
769 bl kernel_fp_unavailable_exception
772 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
774 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
775 * transaction), go do TM stuff
777 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
779 END_FTR_SECTION_IFSET(CPU_FTR_TM)
782 b fast_exception_return
783 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
784 2: /* User process was in a transaction */
786 RECONCILE_IRQ_STATE(r10, r11)
787 addi r3,r1,STACK_FRAME_OVERHEAD
793 EXC_REAL_OOL_MASKABLE(decrementer, 0x900, 0x80, IRQS_DISABLED)
794 EXC_VIRT_MASKABLE(decrementer, 0x4900, 0x80, 0x900, IRQS_DISABLED)
795 TRAMP_KVM(PACA_EXGEN, 0x900)
796 EXC_COMMON_ASYNC(decrementer_common, 0x900, timer_interrupt)
799 EXC_REAL_HV(hdecrementer, 0x980, 0x80)
800 EXC_VIRT_HV(hdecrementer, 0x4980, 0x80, 0x980)
801 TRAMP_KVM_HV(PACA_EXGEN, 0x980)
802 EXC_COMMON(hdecrementer_common, 0x980, hdec_interrupt)
805 EXC_REAL_MASKABLE(doorbell_super, 0xa00, 0x100, IRQS_DISABLED)
806 EXC_VIRT_MASKABLE(doorbell_super, 0x4a00, 0x100, 0xa00, IRQS_DISABLED)
807 TRAMP_KVM(PACA_EXGEN, 0xa00)
808 #ifdef CONFIG_PPC_DOORBELL
809 EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, doorbell_exception)
811 EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, unknown_exception)
815 EXC_REAL(trap_0b, 0xb00, 0x100)
816 EXC_VIRT(trap_0b, 0x4b00, 0x100, 0xb00)
817 TRAMP_KVM(PACA_EXGEN, 0xb00)
818 EXC_COMMON(trap_0b_common, 0xb00, unknown_exception)
821 * system call / hypercall (0xc00, 0x4c00)
823 * The system call exception is invoked with "sc 0" and does not alter HV bit.
824 * There is support for kernel code to invoke system calls but there are no
827 * The hypercall is invoked with "sc 1" and sets HV=1.
829 * In HPT, sc 1 always goes to 0xc00 real mode. In RADIX, sc 1 can go to
830 * 0x4c00 virtual mode.
834 * syscall register convention is in Documentation/powerpc/syscall64-abi.txt
836 * For hypercalls, the register convention is as follows:
839 * r3 volatile parameter and return value for status
840 * r4-r10 volatile input and output value
841 * r11 volatile hypercall number and output value
842 * r12 volatile input and output value
843 * r13-r31 nonvolatile
847 * CR0-1 CR5-7 volatile
849 * Other registers nonvolatile
851 * The intersection of volatile registers that don't contain possible
852 * inputs is: cr0, xer, ctr. We may use these as scratch regs upon entry
853 * without saving, though xer is not a good idea to use, as hardware may
854 * interpret some bits so it may be costly to change them.
856 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
858 * There is a little bit of juggling to get syscall and hcall
859 * working well. Save r13 in ctr to avoid using SPRG scratch
862 * Userspace syscalls have already saved the PPR, hcalls must save
863 * it before setting HMT_MEDIUM.
865 #define SYSCALL_KVMTEST \
868 std r10,PACA_EXGEN+EX_R10(r13); \
869 INTERRUPT_TO_KERNEL; \
870 KVMTEST_PR(0xc00); /* uses r10, branch to do_kvm_0xc00_system_call */ \
875 #define SYSCALL_KVMTEST \
882 #define LOAD_SYSCALL_HANDLER(reg) \
883 __LOAD_HANDLER(reg, system_call_common)
886 * After SYSCALL_KVMTEST, we reach here with PACA in r13, r13 in r9,
889 #define SYSCALL_REAL \
890 mfspr r11,SPRN_SRR0 ; \
891 mfspr r12,SPRN_SRR1 ; \
892 LOAD_SYSCALL_HANDLER(r10) ; \
893 mtspr SPRN_SRR0,r10 ; \
894 ld r10,PACAKMSR(r13) ; \
895 mtspr SPRN_SRR1,r10 ; \
897 b . ; /* prevent speculative execution */
899 #ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH
900 #define SYSCALL_FASTENDIAN_TEST \
904 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
906 #define SYSCALL_FASTENDIAN \
907 /* Fast LE/BE switch system call */ \
908 1: mfspr r12,SPRN_SRR1 ; \
909 xori r12,r12,MSR_LE ; \
910 mtspr SPRN_SRR1,r12 ; \
912 RFI_TO_USER ; /* return to userspace */ \
913 b . ; /* prevent speculative execution */
915 #define SYSCALL_FASTENDIAN_TEST
916 #define SYSCALL_FASTENDIAN
917 #endif /* CONFIG_PPC_FAST_ENDIAN_SWITCH */
919 #if defined(CONFIG_RELOCATABLE)
921 * We can't branch directly so we do it via the CTR which
922 * is volatile across system calls.
924 #define SYSCALL_VIRT \
925 LOAD_SYSCALL_HANDLER(r10) ; \
927 mfspr r11,SPRN_SRR0 ; \
928 mfspr r12,SPRN_SRR1 ; \
933 /* We can branch directly */
934 #define SYSCALL_VIRT \
935 mfspr r11,SPRN_SRR0 ; \
936 mfspr r12,SPRN_SRR1 ; \
938 mtmsrd r10,1 ; /* Set RI (EE=0) */ \
939 b system_call_common ;
942 EXC_REAL_BEGIN(system_call, 0xc00, 0x100)
943 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */
944 SYSCALL_FASTENDIAN_TEST
947 EXC_REAL_END(system_call, 0xc00, 0x100)
949 EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100)
950 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */
951 SYSCALL_FASTENDIAN_TEST
954 EXC_VIRT_END(system_call, 0x4c00, 0x100)
956 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
958 * This is a hcall, so register convention is as above, with these
962 * orig r10 saved in PACA
964 TRAMP_KVM_BEGIN(do_kvm_0xc00)
966 * Save the PPR (on systems that support it) before changing to
967 * HMT_MEDIUM. That allows the KVM code to save that value into the
968 * guest state (it is the guest's PPR value).
970 OPT_GET_SPR(r10, SPRN_PPR, CPU_FTR_HAS_PPR)
972 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r10, CPU_FTR_HAS_PPR)
975 std r9,PACA_EXGEN+EX_R9(r13)
977 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
981 EXC_REAL(single_step, 0xd00, 0x100)
982 EXC_VIRT(single_step, 0x4d00, 0x100, 0xd00)
983 TRAMP_KVM(PACA_EXGEN, 0xd00)
984 EXC_COMMON(single_step_common, 0xd00, single_step_exception)
986 EXC_REAL_OOL_HV(h_data_storage, 0xe00, 0x20)
987 EXC_VIRT_OOL_HV(h_data_storage, 0x4e00, 0x20, 0xe00)
988 TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0xe00)
989 EXC_COMMON_BEGIN(h_data_storage_common)
991 std r10,PACA_EXGEN+EX_DAR(r13)
992 mfspr r10,SPRN_HDSISR
993 stw r10,PACA_EXGEN+EX_DSISR(r13)
994 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
996 RECONCILE_IRQ_STATE(r10, r11)
997 addi r3,r1,STACK_FRAME_OVERHEAD
998 BEGIN_MMU_FTR_SECTION
999 ld r4,PACA_EXGEN+EX_DAR(r13)
1000 lwz r5,PACA_EXGEN+EX_DSISR(r13)
1005 MMU_FTR_SECTION_ELSE
1006 bl unknown_exception
1007 ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX)
1011 EXC_REAL_OOL_HV(h_instr_storage, 0xe20, 0x20)
1012 EXC_VIRT_OOL_HV(h_instr_storage, 0x4e20, 0x20, 0xe20)
1013 TRAMP_KVM_HV(PACA_EXGEN, 0xe20)
1014 EXC_COMMON(h_instr_storage_common, 0xe20, unknown_exception)
1017 EXC_REAL_OOL_HV(emulation_assist, 0xe40, 0x20)
1018 EXC_VIRT_OOL_HV(emulation_assist, 0x4e40, 0x20, 0xe40)
1019 TRAMP_KVM_HV(PACA_EXGEN, 0xe40)
1020 EXC_COMMON(emulation_assist_common, 0xe40, emulation_assist_interrupt)
1024 * hmi_exception trampoline is a special case. It jumps to hmi_exception_early
1025 * first, and then eventaully from there to the trampoline to get into virtual
1028 __EXC_REAL_OOL_HV_DIRECT(hmi_exception, 0xe60, 0x20, hmi_exception_early)
1029 __TRAMP_REAL_OOL_MASKABLE_HV(hmi_exception, 0xe60, IRQS_DISABLED)
1030 EXC_VIRT_NONE(0x4e60, 0x20)
1031 TRAMP_KVM_HV(PACA_EXGEN, 0xe60)
1032 TRAMP_REAL_BEGIN(hmi_exception_early)
1033 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, 0xe60)
1034 mr r10,r1 /* Save r1 */
1035 ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */
1036 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
1037 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
1038 mfspr r12,SPRN_HSRR1 /* Save HSRR1 */
1039 EXCEPTION_PROLOG_COMMON_1()
1040 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
1041 EXCEPTION_PROLOG_COMMON_3(0xe60)
1042 addi r3,r1,STACK_FRAME_OVERHEAD
1043 BRANCH_LINK_TO_FAR(DOTSYM(hmi_exception_realmode)) /* Function call ABI */
1046 /* Windup the stack. */
1047 /* Move original HSRR0 and HSRR1 into the respective regs */
1067 HRFI_TO_USER_OR_KERNEL
1074 * Go to virtual mode and pull the HMI event information from
1077 .globl hmi_exception_after_realmode
1078 hmi_exception_after_realmode:
1080 EXCEPTION_PROLOG_0(PACA_EXGEN)
1081 b tramp_real_hmi_exception
1083 EXC_COMMON_BEGIN(hmi_exception_common)
1084 EXCEPTION_COMMON(PACA_EXGEN, 0xe60, hmi_exception_common, handle_hmi_exception,
1085 ret_from_except, FINISH_NAP;ADD_NVGPRS;ADD_RECONCILE;RUNLATCH_ON)
1087 EXC_REAL_OOL_MASKABLE_HV(h_doorbell, 0xe80, 0x20, IRQS_DISABLED)
1088 EXC_VIRT_OOL_MASKABLE_HV(h_doorbell, 0x4e80, 0x20, 0xe80, IRQS_DISABLED)
1089 TRAMP_KVM_HV(PACA_EXGEN, 0xe80)
1090 #ifdef CONFIG_PPC_DOORBELL
1091 EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, doorbell_exception)
1093 EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, unknown_exception)
1097 EXC_REAL_OOL_MASKABLE_HV(h_virt_irq, 0xea0, 0x20, IRQS_DISABLED)
1098 EXC_VIRT_OOL_MASKABLE_HV(h_virt_irq, 0x4ea0, 0x20, 0xea0, IRQS_DISABLED)
1099 TRAMP_KVM_HV(PACA_EXGEN, 0xea0)
1100 EXC_COMMON_ASYNC(h_virt_irq_common, 0xea0, do_IRQ)
1103 EXC_REAL_NONE(0xec0, 0x20)
1104 EXC_VIRT_NONE(0x4ec0, 0x20)
1105 EXC_REAL_NONE(0xee0, 0x20)
1106 EXC_VIRT_NONE(0x4ee0, 0x20)
1109 EXC_REAL_OOL_MASKABLE(performance_monitor, 0xf00, 0x20, IRQS_PMI_DISABLED)
1110 EXC_VIRT_OOL_MASKABLE(performance_monitor, 0x4f00, 0x20, 0xf00, IRQS_PMI_DISABLED)
1111 TRAMP_KVM(PACA_EXGEN, 0xf00)
1112 EXC_COMMON_ASYNC(performance_monitor_common, 0xf00, performance_monitor_exception)
1115 EXC_REAL_OOL(altivec_unavailable, 0xf20, 0x20)
1116 EXC_VIRT_OOL(altivec_unavailable, 0x4f20, 0x20, 0xf20)
1117 TRAMP_KVM(PACA_EXGEN, 0xf20)
1118 EXC_COMMON_BEGIN(altivec_unavailable_common)
1119 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1120 #ifdef CONFIG_ALTIVEC
1123 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1124 BEGIN_FTR_SECTION_NESTED(69)
1125 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1126 * transaction), go do TM stuff
1128 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1130 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1133 b fast_exception_return
1134 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1135 2: /* User process was in a transaction */
1137 RECONCILE_IRQ_STATE(r10, r11)
1138 addi r3,r1,STACK_FRAME_OVERHEAD
1139 bl altivec_unavailable_tm
1143 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1146 RECONCILE_IRQ_STATE(r10, r11)
1147 addi r3,r1,STACK_FRAME_OVERHEAD
1148 bl altivec_unavailable_exception
1152 EXC_REAL_OOL(vsx_unavailable, 0xf40, 0x20)
1153 EXC_VIRT_OOL(vsx_unavailable, 0x4f40, 0x20, 0xf40)
1154 TRAMP_KVM(PACA_EXGEN, 0xf40)
1155 EXC_COMMON_BEGIN(vsx_unavailable_common)
1156 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
1160 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1161 BEGIN_FTR_SECTION_NESTED(69)
1162 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1163 * transaction), go do TM stuff
1165 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1167 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1170 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1171 2: /* User process was in a transaction */
1173 RECONCILE_IRQ_STATE(r10, r11)
1174 addi r3,r1,STACK_FRAME_OVERHEAD
1175 bl vsx_unavailable_tm
1179 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
1182 RECONCILE_IRQ_STATE(r10, r11)
1183 addi r3,r1,STACK_FRAME_OVERHEAD
1184 bl vsx_unavailable_exception
1188 EXC_REAL_OOL(facility_unavailable, 0xf60, 0x20)
1189 EXC_VIRT_OOL(facility_unavailable, 0x4f60, 0x20, 0xf60)
1190 TRAMP_KVM(PACA_EXGEN, 0xf60)
1191 EXC_COMMON(facility_unavailable_common, 0xf60, facility_unavailable_exception)
1194 EXC_REAL_OOL_HV(h_facility_unavailable, 0xf80, 0x20)
1195 EXC_VIRT_OOL_HV(h_facility_unavailable, 0x4f80, 0x20, 0xf80)
1196 TRAMP_KVM_HV(PACA_EXGEN, 0xf80)
1197 EXC_COMMON(h_facility_unavailable_common, 0xf80, facility_unavailable_exception)
1200 EXC_REAL_NONE(0xfa0, 0x20)
1201 EXC_VIRT_NONE(0x4fa0, 0x20)
1202 EXC_REAL_NONE(0xfc0, 0x20)
1203 EXC_VIRT_NONE(0x4fc0, 0x20)
1204 EXC_REAL_NONE(0xfe0, 0x20)
1205 EXC_VIRT_NONE(0x4fe0, 0x20)
1207 EXC_REAL_NONE(0x1000, 0x100)
1208 EXC_VIRT_NONE(0x5000, 0x100)
1209 EXC_REAL_NONE(0x1100, 0x100)
1210 EXC_VIRT_NONE(0x5100, 0x100)
1212 #ifdef CONFIG_CBE_RAS
1213 EXC_REAL_HV(cbe_system_error, 0x1200, 0x100)
1214 EXC_VIRT_NONE(0x5200, 0x100)
1215 TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1200)
1216 EXC_COMMON(cbe_system_error_common, 0x1200, cbe_system_error_exception)
1217 #else /* CONFIG_CBE_RAS */
1218 EXC_REAL_NONE(0x1200, 0x100)
1219 EXC_VIRT_NONE(0x5200, 0x100)
1223 EXC_REAL(instruction_breakpoint, 0x1300, 0x100)
1224 EXC_VIRT(instruction_breakpoint, 0x5300, 0x100, 0x1300)
1225 TRAMP_KVM_SKIP(PACA_EXGEN, 0x1300)
1226 EXC_COMMON(instruction_breakpoint_common, 0x1300, instruction_breakpoint_exception)
1228 EXC_REAL_NONE(0x1400, 0x100)
1229 EXC_VIRT_NONE(0x5400, 0x100)
1231 EXC_REAL_BEGIN(denorm_exception_hv, 0x1500, 0x100)
1232 mtspr SPRN_SPRG_HSCRATCH0,r13
1233 EXCEPTION_PROLOG_0(PACA_EXGEN)
1234 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
1236 #ifdef CONFIG_PPC_DENORMALISATION
1237 mfspr r10,SPRN_HSRR1
1238 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
1243 EXCEPTION_PROLOG_2(denorm_common, EXC_HV)
1244 EXC_REAL_END(denorm_exception_hv, 0x1500, 0x100)
1246 #ifdef CONFIG_PPC_DENORMALISATION
1247 EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100)
1248 b exc_real_0x1500_denorm_exception_hv
1249 EXC_VIRT_END(denorm_exception, 0x5500, 0x100)
1251 EXC_VIRT_NONE(0x5500, 0x100)
1254 TRAMP_KVM_HV(PACA_EXGEN, 0x1500)
1256 #ifdef CONFIG_PPC_DENORMALISATION
1257 TRAMP_REAL_BEGIN(denorm_assist)
1260 * To denormalise we need to move a copy of the register to itself.
1261 * For POWER6 do that here for all FP regs.
1264 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
1265 xori r10,r10,(MSR_FE0|MSR_FE1)
1269 #define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
1270 #define FMR4(n) FMR2(n) ; FMR2(n+2)
1271 #define FMR8(n) FMR4(n) ; FMR4(n+4)
1272 #define FMR16(n) FMR8(n) ; FMR8(n+8)
1273 #define FMR32(n) FMR16(n) ; FMR16(n+16)
1278 * To denormalise we need to move a copy of the register to itself.
1279 * For POWER7 do that here for the first 32 VSX registers only.
1282 oris r10,r10,MSR_VSX@h
1286 #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
1287 #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
1288 #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
1289 #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
1290 #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
1293 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
1297 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
1299 * To denormalise we need to move a copy of the register to itself.
1300 * For POWER8 we need to do that for all 64 VSX registers
1304 mfspr r11,SPRN_HSRR0
1306 mtspr SPRN_HSRR0,r11
1308 ld r9,PACA_EXGEN+EX_R9(r13)
1309 RESTORE_PPR_PACA(PACA_EXGEN, r10)
1311 ld r10,PACA_EXGEN+EX_CFAR(r13)
1313 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1314 ld r10,PACA_EXGEN+EX_R10(r13)
1315 ld r11,PACA_EXGEN+EX_R11(r13)
1316 ld r12,PACA_EXGEN+EX_R12(r13)
1317 ld r13,PACA_EXGEN+EX_R13(r13)
1322 EXC_COMMON(denorm_common, 0x1500, unknown_exception)
1325 #ifdef CONFIG_CBE_RAS
1326 EXC_REAL_HV(cbe_maintenance, 0x1600, 0x100)
1327 EXC_VIRT_NONE(0x5600, 0x100)
1328 TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1600)
1329 EXC_COMMON(cbe_maintenance_common, 0x1600, cbe_maintenance_exception)
1330 #else /* CONFIG_CBE_RAS */
1331 EXC_REAL_NONE(0x1600, 0x100)
1332 EXC_VIRT_NONE(0x5600, 0x100)
1336 EXC_REAL(altivec_assist, 0x1700, 0x100)
1337 EXC_VIRT(altivec_assist, 0x5700, 0x100, 0x1700)
1338 TRAMP_KVM(PACA_EXGEN, 0x1700)
1339 #ifdef CONFIG_ALTIVEC
1340 EXC_COMMON(altivec_assist_common, 0x1700, altivec_assist_exception)
1342 EXC_COMMON(altivec_assist_common, 0x1700, unknown_exception)
1346 #ifdef CONFIG_CBE_RAS
1347 EXC_REAL_HV(cbe_thermal, 0x1800, 0x100)
1348 EXC_VIRT_NONE(0x5800, 0x100)
1349 TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1800)
1350 EXC_COMMON(cbe_thermal_common, 0x1800, cbe_thermal_exception)
1351 #else /* CONFIG_CBE_RAS */
1352 EXC_REAL_NONE(0x1800, 0x100)
1353 EXC_VIRT_NONE(0x5800, 0x100)
1356 #ifdef CONFIG_PPC_WATCHDOG
1358 #define MASKED_DEC_HANDLER_LABEL 3f
1360 #define MASKED_DEC_HANDLER(_H) \
1362 std r12,PACA_EXGEN+EX_R12(r13); \
1363 GET_SCRATCH0(r10); \
1364 std r10,PACA_EXGEN+EX_R13(r13); \
1365 EXCEPTION_PROLOG_2(soft_nmi_common, _H)
1368 * Branch to soft_nmi_interrupt using the emergency stack. The emergency
1369 * stack is one that is usable by maskable interrupts so long as MSR_EE
1370 * remains off. It is used for recovery when something has corrupted the
1371 * normal kernel stack, for example. The "soft NMI" must not use the process
1372 * stack because we want irq disabled sections to avoid touching the stack
1373 * at all (other than PMU interrupts), so use the emergency stack for this,
1374 * and run it entirely with interrupts hard disabled.
1376 EXC_COMMON_BEGIN(soft_nmi_common)
1378 ld r1,PACAEMERGSP(r13)
1379 subi r1,r1,INT_FRAME_SIZE
1380 EXCEPTION_COMMON_NORET_STACK(PACA_EXGEN, 0x900,
1381 system_reset, soft_nmi_interrupt,
1382 ADD_NVGPRS;ADD_RECONCILE)
1385 #else /* CONFIG_PPC_WATCHDOG */
1386 #define MASKED_DEC_HANDLER_LABEL 2f /* normal return */
1387 #define MASKED_DEC_HANDLER(_H)
1388 #endif /* CONFIG_PPC_WATCHDOG */
1391 * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
1392 * - If it was a decrementer interrupt, we bump the dec to max and and return.
1393 * - If it was a doorbell we return immediately since doorbells are edge
1394 * triggered and won't automatically refire.
1395 * - If it was a HMI we return immediately since we handled it in realmode
1396 * and it won't refire.
1397 * - Else it is one of PACA_IRQ_MUST_HARD_MASK, so hard disable and return.
1398 * This is called with r10 containing the value to OR to the paca field.
1400 #define MASKED_INTERRUPT(_H) \
1401 masked_##_H##interrupt: \
1402 std r11,PACA_EXGEN+EX_R11(r13); \
1403 lbz r11,PACAIRQHAPPENED(r13); \
1405 stb r11,PACAIRQHAPPENED(r13); \
1406 cmpwi r10,PACA_IRQ_DEC; \
1409 ori r10,r10,0xffff; \
1410 mtspr SPRN_DEC,r10; \
1411 b MASKED_DEC_HANDLER_LABEL; \
1412 1: andi. r10,r10,PACA_IRQ_MUST_HARD_MASK; \
1414 mfspr r10,SPRN_##_H##SRR1; \
1415 xori r10,r10,MSR_EE; /* clear MSR_EE */ \
1416 mtspr SPRN_##_H##SRR1,r10; \
1417 ori r11,r11,PACA_IRQ_HARD_DIS; \
1418 stb r11,PACAIRQHAPPENED(r13); \
1421 std r1,PACAR1(r13); \
1422 ld r9,PACA_EXGEN+EX_R9(r13); \
1423 ld r10,PACA_EXGEN+EX_R10(r13); \
1424 ld r11,PACA_EXGEN+EX_R11(r13); \
1425 /* returns to kernel where r13 must be set up, so don't restore it */ \
1426 ##_H##RFI_TO_KERNEL; \
1428 MASKED_DEC_HANDLER(_H)
1430 TRAMP_REAL_BEGIN(stf_barrier_fallback)
1431 std r9,PACA_EXRFI+EX_R9(r13)
1432 std r10,PACA_EXRFI+EX_R10(r13)
1434 ld r9,PACA_EXRFI+EX_R9(r13)
1435 ld r10,PACA_EXRFI+EX_R10(r13)
1443 TRAMP_REAL_BEGIN(rfi_flush_fallback)
1446 std r1,PACA_EXRFI+EX_R12(r13)
1447 ld r1,PACAKSAVE(r13)
1448 std r9,PACA_EXRFI+EX_R9(r13)
1449 std r10,PACA_EXRFI+EX_R10(r13)
1450 std r11,PACA_EXRFI+EX_R11(r13)
1452 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13)
1453 ld r11,PACA_L1D_FLUSH_SIZE(r13)
1454 srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */
1456 DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */
1458 /* order ld/st prior to dcbt stop all streams with flushing */
1462 * The load adresses are at staggered offsets within cachelines,
1463 * which suits some pipelines better (on others it should not
1467 ld r11,(0x80 + 8)*0(r10)
1468 ld r11,(0x80 + 8)*1(r10)
1469 ld r11,(0x80 + 8)*2(r10)
1470 ld r11,(0x80 + 8)*3(r10)
1471 ld r11,(0x80 + 8)*4(r10)
1472 ld r11,(0x80 + 8)*5(r10)
1473 ld r11,(0x80 + 8)*6(r10)
1474 ld r11,(0x80 + 8)*7(r10)
1479 ld r9,PACA_EXRFI+EX_R9(r13)
1480 ld r10,PACA_EXRFI+EX_R10(r13)
1481 ld r11,PACA_EXRFI+EX_R11(r13)
1482 ld r1,PACA_EXRFI+EX_R12(r13)
1486 TRAMP_REAL_BEGIN(hrfi_flush_fallback)
1489 std r1,PACA_EXRFI+EX_R12(r13)
1490 ld r1,PACAKSAVE(r13)
1491 std r9,PACA_EXRFI+EX_R9(r13)
1492 std r10,PACA_EXRFI+EX_R10(r13)
1493 std r11,PACA_EXRFI+EX_R11(r13)
1495 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13)
1496 ld r11,PACA_L1D_FLUSH_SIZE(r13)
1497 srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */
1499 DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */
1501 /* order ld/st prior to dcbt stop all streams with flushing */
1505 * The load adresses are at staggered offsets within cachelines,
1506 * which suits some pipelines better (on others it should not
1510 ld r11,(0x80 + 8)*0(r10)
1511 ld r11,(0x80 + 8)*1(r10)
1512 ld r11,(0x80 + 8)*2(r10)
1513 ld r11,(0x80 + 8)*3(r10)
1514 ld r11,(0x80 + 8)*4(r10)
1515 ld r11,(0x80 + 8)*5(r10)
1516 ld r11,(0x80 + 8)*6(r10)
1517 ld r11,(0x80 + 8)*7(r10)
1522 ld r9,PACA_EXRFI+EX_R9(r13)
1523 ld r10,PACA_EXRFI+EX_R10(r13)
1524 ld r11,PACA_EXRFI+EX_R11(r13)
1525 ld r1,PACA_EXRFI+EX_R12(r13)
1530 * Real mode exceptions actually use this too, but alternate
1531 * instruction code patches (which end up in the common .text area)
1532 * cannot reach these if they are put there.
1534 USE_FIXED_SECTION(virt_trampolines)
1538 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
1539 TRAMP_REAL_BEGIN(kvmppc_skip_interrupt)
1541 * Here all GPRs are unchanged from when the interrupt happened
1542 * except for r13, which is saved in SPRG_SCRATCH0.
1544 mfspr r13, SPRN_SRR0
1546 mtspr SPRN_SRR0, r13
1551 TRAMP_REAL_BEGIN(kvmppc_skip_Hinterrupt)
1553 * Here all GPRs are unchanged from when the interrupt happened
1554 * except for r13, which is saved in SPRG_SCRATCH0.
1556 mfspr r13, SPRN_HSRR0
1558 mtspr SPRN_HSRR0, r13
1565 * Ensure that any handlers that get invoked from the exception prologs
1566 * above are below the first 64KB (0x10000) of the kernel image because
1567 * the prologs assemble the addresses of these handlers using the
1568 * LOAD_HANDLER macro, which uses an ori instruction.
1571 /*** Common interrupt handlers ***/
1575 * Relocation-on interrupts: A subset of the interrupts can be delivered
1576 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
1577 * it. Addresses are the same as the original interrupt addresses, but
1578 * offset by 0xc000000000004000.
1579 * It's impossible to receive interrupts below 0x300 via this mechanism.
1580 * KVM: None of these traps are from the guest ; anything that escalated
1581 * to HV=1 from HV=0 is delivered via real mode handlers.
1585 * This uses the standard macro, since the original 0x300 vector
1586 * only has extra guff for STAB-based processors -- which never
1590 EXC_COMMON_BEGIN(ppc64_runlatch_on_trampoline)
1591 b __ppc64_runlatch_on
1593 USE_FIXED_SECTION(virt_trampolines)
1595 * The __end_interrupts marker must be past the out-of-line (OOL)
1596 * handlers, so that they are copied to real address 0x100 when running
1597 * a relocatable kernel. This ensures they can be reached from the short
1598 * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch
1599 * directly, without using LOAD_HANDLER().
1602 .globl __end_interrupts
1604 DEFINE_FIXED_SYMBOL(__end_interrupts)
1606 #ifdef CONFIG_PPC_970_NAP
1607 EXC_COMMON_BEGIN(power4_fixup_nap)
1609 std r9,TI_LOCAL_FLAGS(r11)
1610 ld r10,_LINK(r1) /* make idle task do the */
1611 std r10,_NIP(r1) /* equivalent of a blr */
1615 CLOSE_FIXED_SECTION(real_vectors);
1616 CLOSE_FIXED_SECTION(real_trampolines);
1617 CLOSE_FIXED_SECTION(virt_vectors);
1618 CLOSE_FIXED_SECTION(virt_trampolines);
1625 .balign IFETCH_ALIGN_BYTES
1627 #ifdef CONFIG_PPC_BOOK3S_64
1628 lis r0,(DSISR_BAD_FAULT_64S | DSISR_DABRMATCH | DSISR_KEYFAULT)@h
1629 ori r0,r0,DSISR_BAD_FAULT_64S@l
1630 and. r0,r4,r0 /* weird error? */
1631 bne- handle_page_fault /* if not, try to insert a HPTE */
1632 CURRENT_THREAD_INFO(r11, r1)
1633 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
1634 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
1635 bne 77f /* then don't call hash_page now */
1638 * r3 contains the faulting address
1640 * r5 contains the trap number
1643 * at return r3 = 0 for success, 1 for page fault, negative for error
1647 bl __hash_page /* build HPTE if possible */
1648 cmpdi r3,0 /* see if __hash_page succeeded */
1651 beq fast_exc_return_irq /* Return from exception on success */
1656 /* Reload DSISR into r4 for the DABR check below */
1658 #endif /* CONFIG_PPC_BOOK3S_64 */
1660 /* Here we have a page fault that hash_page can't handle. */
1662 11: andis. r0,r4,DSISR_DABRMATCH@h
1663 bne- handle_dabr_fault
1666 addi r3,r1,STACK_FRAME_OVERHEAD
1672 addi r3,r1,STACK_FRAME_OVERHEAD
1677 /* We have a data breakpoint exception - handle it */
1682 addi r3,r1,STACK_FRAME_OVERHEAD
1684 12: b ret_from_except_lite
1687 #ifdef CONFIG_PPC_BOOK3S_64
1688 /* We have a page fault that hash_page could handle but HV refused
1693 addi r3,r1,STACK_FRAME_OVERHEAD
1700 * We come here as a result of a DSI at a point where we don't want
1701 * to call hash_page, such as when we are accessing memory (possibly
1702 * user memory) inside a PMU interrupt that occurred while interrupts
1703 * were soft-disabled. We want to invoke the exception handler for
1704 * the access, or panic if there isn't a handler.
1708 addi r3,r1,STACK_FRAME_OVERHEAD
1714 * Here we have detected that the kernel stack pointer is bad.
1715 * R9 contains the saved CR, r13 points to the paca,
1716 * r10 contains the (bad) kernel stack pointer,
1717 * r11 and r12 contain the saved SRR0 and SRR1.
1718 * We switch to using an emergency stack, save the registers there,
1719 * and call kernel_bad_stack(), which panics.
1722 ld r1,PACAEMERGSP(r13)
1723 subi r1,r1,64+INT_FRAME_SIZE
1729 mfspr r12,SPRN_DSISR
1755 std r10,ORIG_GPR3(r1)
1756 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1759 lhz r12,PACA_TRAP_SAVE(r13)
1761 addi r11,r1,INT_FRAME_SIZE
1766 ld r11,exception_marker@toc(r2)
1768 std r11,STACK_FRAME_OVERHEAD-16(r1)
1769 1: addi r3,r1,STACK_FRAME_OVERHEAD
1772 _ASM_NOKPROBE_SYMBOL(bad_stack);
1775 * When doorbell is triggered from system reset wakeup, the message is
1776 * not cleared, so it would fire again when EE is enabled.
1778 * When coming from local_irq_enable, there may be the same problem if
1779 * we were hard disabled.
1781 * Execute msgclr to clear pending exceptions before handling it.
1783 h_doorbell_common_msgclr:
1784 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36))
1788 doorbell_super_common_msgclr:
1789 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36))
1791 b doorbell_super_common
1794 * Called from arch_local_irq_enable when an interrupt needs
1795 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
1796 * which kind of interrupt. MSR:EE is already off. We generate a
1797 * stackframe like if a real interrupt had happened.
1799 * Note: While MSR:EE is off, we need to make sure that _MSR
1800 * in the generated frame has EE set to 1 or the exception
1801 * handler will not properly re-enable them.
1803 * Note that we don't specify LR as the NIP (return address) for
1804 * the interrupt because that would unbalance the return branch
1807 _GLOBAL(__replay_interrupt)
1808 /* We are going to jump to the exception common code which
1809 * will retrieve various register values from the PACA which
1810 * we don't give a damn about, so we don't bother storing them.
1813 LOAD_REG_ADDR(r11, replay_interrupt_return)
1817 beq decrementer_common
1820 beq h_virt_irq_common
1822 beq hardware_interrupt_common
1823 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_300)
1825 beq performance_monitor_common
1828 beq h_doorbell_common_msgclr
1830 beq hmi_exception_common
1833 beq doorbell_super_common_msgclr
1834 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
1835 replay_interrupt_return:
1838 _ASM_NOKPROBE_SYMBOL(__replay_interrupt)