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>
23 * There are a few constraints to be concerned with.
24 * - Real mode exceptions code/data must be located at their physical location.
25 * - Virtual mode exceptions must be mapped at their 0xc000... location.
26 * - Fixed location code must not call directly beyond the __end_interrupts
27 * area when built with CONFIG_RELOCATABLE. LOAD_HANDLER / bctr sequence
29 * - LOAD_HANDLER targets must be within first 64K of physical 0 /
31 * - Conditional branch targets must be within +/-32K of caller.
33 * "Virtual exceptions" run with relocation on (MSR_IR=1, MSR_DR=1), and
34 * therefore don't have to run in physically located code or rfid to
35 * virtual mode kernel code. However on relocatable kernels they do have
36 * to branch to KERNELBASE offset because the rest of the kernel (outside
37 * the exception vectors) may be located elsewhere.
39 * Virtual exceptions correspond with physical, except their entry points
40 * are offset by 0xc000000000000000 and also tend to get an added 0x4000
41 * offset applied. Virtual exceptions are enabled with the Alternate
42 * Interrupt Location (AIL) bit set in the LPCR. However this does not
43 * guarantee they will be delivered virtually. Some conditions (see the ISA)
44 * cause exceptions to be delivered in real mode.
46 * It's impossible to receive interrupts below 0x300 via AIL.
48 * KVM: None of the virtual exceptions are from the guest. Anything that
49 * escalated to HV=1 from HV=0 is delivered via real mode handlers.
52 * We layout physical memory as follows:
53 * 0x0000 - 0x00ff : Secondary processor spin code
54 * 0x0100 - 0x18ff : Real mode pSeries interrupt vectors
55 * 0x1900 - 0x3fff : Real mode trampolines
56 * 0x4000 - 0x58ff : Relon (IR=1,DR=1) mode pSeries interrupt vectors
57 * 0x5900 - 0x6fff : Relon mode trampolines
58 * 0x7000 - 0x7fff : FWNMI data area
59 * 0x8000 - .... : Common interrupt handlers, remaining early
60 * setup code, rest of kernel.
62 * We could reclaim 0x4000-0x42ff for real mode trampolines if the space
63 * is necessary. Until then it's more consistent to explicitly put VIRT_NONE
66 OPEN_FIXED_SECTION(real_vectors, 0x0100, 0x1900)
67 OPEN_FIXED_SECTION(real_trampolines, 0x1900, 0x4000)
68 OPEN_FIXED_SECTION(virt_vectors, 0x4000, 0x5900)
69 OPEN_FIXED_SECTION(virt_trampolines, 0x5900, 0x7000)
70 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
72 * Data area reserved for FWNMI option.
73 * This address (0x7000) is fixed by the RPA.
74 * pseries and powernv need to keep the whole page from
75 * 0x7000 to 0x8000 free for use by the firmware
77 ZERO_FIXED_SECTION(fwnmi_page, 0x7000, 0x8000)
78 OPEN_TEXT_SECTION(0x8000)
80 OPEN_TEXT_SECTION(0x7000)
83 USE_FIXED_SECTION(real_vectors)
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.
93 .globl __start_interrupts
96 /* No virt vectors corresponding with 0x0..0x100 */
97 EXC_VIRT_NONE(0x4000, 0x100)
100 #ifdef CONFIG_PPC_P7_NAP
102 * If running native on arch 2.06 or later, check if we are waking up
103 * from nap/sleep/winkle, and branch to idle handler. This tests SRR1
104 * bits 46:47. A non-0 value indicates that we are coming from a power
105 * saving state. The idle wakeup handler initially runs in real mode,
106 * but we branch to the 0xc000... address so we can turn on relocation
109 #define IDLETEST(n) \
110 BEGIN_FTR_SECTION ; \
111 mfspr r10,SPRN_SRR1 ; \
112 rlwinm. r10,r10,47-31,30,31 ; \
115 BRANCH_TO_C000(r10, system_reset_idle_common) ; \
117 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
119 #define IDLETEST NOTEST
122 EXC_REAL_BEGIN(system_reset, 0x100, 0x100)
125 * MSR_RI is not enabled, because PACA_EXNMI and nmi stack is
126 * being used, so a nested NMI exception would corrupt it.
128 EXCEPTION_PROLOG_PSERIES_NORI(PACA_EXNMI, system_reset_common, EXC_STD,
131 EXC_REAL_END(system_reset, 0x100, 0x100)
132 EXC_VIRT_NONE(0x4100, 0x100)
134 #ifdef CONFIG_PPC_P7_NAP
135 EXC_COMMON_BEGIN(system_reset_idle_common)
137 b pnv_powersave_wakeup
140 EXC_COMMON_BEGIN(system_reset_common)
142 * Increment paca->in_nmi then enable MSR_RI. SLB or MCE will be able
143 * to recover, but nested NMI will notice in_nmi and not recover
144 * because of the use of the NMI stack. in_nmi reentrancy is tested in
145 * system_reset_exception.
147 lhz r10,PACA_IN_NMI(r13)
149 sth r10,PACA_IN_NMI(r13)
154 ld r1,PACA_NMI_EMERG_SP(r13)
155 subi r1,r1,INT_FRAME_SIZE
156 EXCEPTION_COMMON_NORET_STACK(PACA_EXNMI, 0x100,
157 system_reset, system_reset_exception,
158 ADD_NVGPRS;ADD_RECONCILE)
161 * The stack is no longer in use, decrement in_nmi.
163 lhz r10,PACA_IN_NMI(r13)
165 sth r10,PACA_IN_NMI(r13)
169 #ifdef CONFIG_PPC_PSERIES
171 * Vectors for the FWNMI option. Share common code.
173 TRAMP_REAL_BEGIN(system_reset_fwnmi)
174 SET_SCRATCH0(r13) /* save r13 */
175 /* See comment at system_reset exception */
176 EXCEPTION_PROLOG_PSERIES_NORI(PACA_EXNMI, system_reset_common,
177 EXC_STD, NOTEST, 0x100)
178 #endif /* CONFIG_PPC_PSERIES */
181 EXC_REAL_BEGIN(machine_check, 0x200, 0x100)
182 /* This is moved out of line as it can be patched by FW, but
183 * some code path might still want to branch into the original
186 SET_SCRATCH0(r13) /* save r13 */
187 EXCEPTION_PROLOG_0(PACA_EXMC)
189 b machine_check_powernv_early
191 b machine_check_pSeries_0
192 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
193 EXC_REAL_END(machine_check, 0x200, 0x100)
194 EXC_VIRT_NONE(0x4200, 0x100)
195 TRAMP_REAL_BEGIN(machine_check_powernv_early)
197 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
202 * Original R9 to R13 is saved on PACA_EXMC
204 * Switch to mc_emergency stack and handle re-entrancy (we limit
205 * the nested MCE upto level 4 to avoid stack overflow).
206 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1
208 * We use paca->in_mce to check whether this is the first entry or
209 * nested machine check. We increment paca->in_mce to track nested
212 * If this is the first entry then set stack pointer to
213 * paca->mc_emergency_sp, otherwise r1 is already pointing to
214 * stack frame on mc_emergency stack.
216 * NOTE: We are here with MSR_ME=0 (off), which means we risk a
217 * checkstop if we get another machine check exception before we do
218 * rfid with MSR_ME=1.
220 * This interrupt can wake directly from idle. If that is the case,
221 * the machine check is handled then the idle wakeup code is called
222 * to restore state. In that case, the POWER9 DD1 idle PACA workaround
223 * is not applied in the early machine check code, which will cause
226 mr r11,r1 /* Save r1 */
227 lhz r10,PACA_IN_MCE(r13)
228 cmpwi r10,0 /* Are we in nested machine check */
229 bne 0f /* Yes, we are. */
230 /* First machine check entry */
231 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
232 0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
233 addi r10,r10,1 /* increment paca->in_mce */
234 sth r10,PACA_IN_MCE(r13)
235 /* Limit nested MCE to level 4 to avoid stack overflow */
237 bgt 2f /* Check if we hit limit of 4 */
238 std r11,GPR1(r1) /* Save r1 on the stack. */
239 std r11,0(r1) /* make stack chain pointer */
240 mfspr r11,SPRN_SRR0 /* Save SRR0 */
242 mfspr r11,SPRN_SRR1 /* Save SRR1 */
244 mfspr r11,SPRN_DAR /* Save DAR */
246 mfspr r11,SPRN_DSISR /* Save DSISR */
248 std r9,_CCR(r1) /* Save CR in stackframe */
249 /* Save r9 through r13 from EXMC save area to stack frame. */
250 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC)
251 mfmsr r11 /* get MSR value */
252 ori r11,r11,MSR_ME /* turn on ME bit */
253 ori r11,r11,MSR_RI /* turn on RI bit */
254 LOAD_HANDLER(r12, machine_check_handle_early)
255 1: mtspr SPRN_SRR0,r12
258 b . /* prevent speculative execution */
260 /* Stack overflow. Stay on emergency stack and panic.
261 * Keep the ME bit off while panic-ing, so that if we hit
262 * another machine check we checkstop.
264 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */
266 LOAD_HANDLER(r12, unrecover_mce)
268 andc r11,r11,r10 /* Turn off MSR_ME */
270 b . /* prevent speculative execution */
271 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
273 TRAMP_REAL_BEGIN(machine_check_pSeries)
274 .globl machine_check_fwnmi
276 SET_SCRATCH0(r13) /* save r13 */
277 EXCEPTION_PROLOG_0(PACA_EXMC)
278 machine_check_pSeries_0:
279 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200)
281 * MSR_RI is not enabled, because PACA_EXMC is being used, so a
282 * nested machine check corrupts it. machine_check_common enables
285 EXCEPTION_PROLOG_PSERIES_1_NORI(machine_check_common, EXC_STD)
287 TRAMP_KVM_SKIP(PACA_EXMC, 0x200)
289 EXC_COMMON_BEGIN(machine_check_common)
291 * Machine check is different because we use a different
292 * save area: PACA_EXMC instead of PACA_EXGEN.
295 std r10,PACA_EXMC+EX_DAR(r13)
297 stw r10,PACA_EXMC+EX_DSISR(r13)
298 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
300 RECONCILE_IRQ_STATE(r10, r11)
301 ld r3,PACA_EXMC+EX_DAR(r13)
302 lwz r4,PACA_EXMC+EX_DSISR(r13)
303 /* Enable MSR_RI when finished with PACA_EXMC */
309 addi r3,r1,STACK_FRAME_OVERHEAD
310 bl machine_check_exception
313 #define MACHINE_CHECK_HANDLER_WINDUP \
314 /* Clear MSR_RI before setting SRR0 and SRR1. */\
316 mfmsr r9; /* get MSR value */ \
318 mtmsrd r9,1; /* Clear MSR_RI */ \
319 /* Move original SRR0 and SRR1 into the respective regs */ \
321 mtspr SPRN_SRR1,r9; \
323 mtspr SPRN_SRR0,r3; \
335 /* Decrement paca->in_mce. */ \
336 lhz r12,PACA_IN_MCE(r13); \
338 sth r12,PACA_IN_MCE(r13); \
340 REST_2GPRS(12, r1); \
341 /* restore original r1. */ \
344 #ifdef CONFIG_PPC_P7_NAP
346 * This is an idle wakeup. Low level machine check has already been
347 * done. Queue the event then call the idle code to do the wake up.
349 EXC_COMMON_BEGIN(machine_check_idle_common)
350 bl machine_check_queue_event
353 * We have not used any non-volatile GPRs here, and as a rule
354 * most exception code including machine check does not.
355 * Therefore PACA_NAPSTATELOST does not need to be set. Idle
356 * wakeup will restore volatile registers.
358 * Load the original SRR1 into r3 for pnv_powersave_wakeup_mce.
360 * Then decrement MCE nesting after finishing with the stack.
364 lhz r11,PACA_IN_MCE(r13)
366 sth r11,PACA_IN_MCE(r13)
368 /* Turn off the RI bit because SRR1 is used by idle wakeup code. */
369 /* Recoverability could be improved by reducing the use of SRR1. */
373 b pnv_powersave_wakeup_mce
376 * Handle machine check early in real mode. We come here with
377 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack.
379 EXC_COMMON_BEGIN(machine_check_handle_early)
380 std r0,GPR0(r1) /* Save r0 */
381 EXCEPTION_PROLOG_COMMON_3(0x200)
383 addi r3,r1,STACK_FRAME_OVERHEAD
384 bl machine_check_early
385 std r3,RESULT(r1) /* Save result */
388 #ifdef CONFIG_PPC_P7_NAP
390 * Check if thread was in power saving mode. We come here when any
391 * of the following is true:
392 * a. thread wasn't in power saving mode
393 * b. thread was in power saving mode with no state loss,
394 * supervisor state loss or hypervisor state loss.
396 * Go back to nap/sleep/winkle mode again if (b) is true.
399 rlwinm. r11,r12,47-31,30,31
400 bne machine_check_idle_common
401 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
405 * Check if we are coming from hypervisor userspace. If yes then we
406 * continue in host kernel in V mode to deliver the MC event.
408 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */
410 andi. r11,r12,MSR_PR /* See if coming from user. */
411 bne 9f /* continue in V mode if we are. */
414 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
416 * We are coming from kernel context. Check if we are coming from
417 * guest. if yes, then we can continue. We will fall through
418 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest.
420 lbz r11,HSTATE_IN_GUEST(r13)
421 cmpwi r11,0 /* Check if coming from guest */
422 bne 9f /* continue if we are. */
425 * At this point we are not sure about what context we come from.
426 * Queue up the MCE event and return from the interrupt.
427 * But before that, check if this is an un-recoverable exception.
428 * If yes, then stay on emergency stack and panic.
432 1: mfspr r11,SPRN_SRR0
433 LOAD_HANDLER(r10,unrecover_mce)
437 * We are going down. But there are chances that we might get hit by
438 * another MCE during panic path and we may run into unstable state
439 * with no way out. Hence, turn ME bit off while going down, so that
440 * when another MCE is hit during panic path, system will checkstop
441 * and hypervisor will get restarted cleanly by SP.
444 andc r10,r10,r3 /* Turn off MSR_ME */
450 * Check if we have successfully handled/recovered from error, if not
451 * then stay on emergency stack and panic.
453 ld r3,RESULT(r1) /* Load result */
454 cmpdi r3,0 /* see if we handled MCE successfully */
456 beq 1b /* if !handled then panic */
458 * Return from MC interrupt.
459 * Queue up the MCE event so that we can log it later, while
460 * returning from kernel or opal call.
462 bl machine_check_queue_event
463 MACHINE_CHECK_HANDLER_WINDUP
464 RFI_TO_USER_OR_KERNEL
466 /* Deliver the machine check to host kernel in V mode. */
470 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
471 MACHINE_CHECK_HANDLER_WINDUP
472 b machine_check_pSeries
474 EXC_COMMON_BEGIN(unrecover_mce)
475 /* Invoke machine_check_exception to print MCE event and panic. */
476 addi r3,r1,STACK_FRAME_OVERHEAD
477 bl machine_check_exception
479 * We will not reach here. Even if we did, there is no way out. Call
480 * unrecoverable_exception and die.
482 1: addi r3,r1,STACK_FRAME_OVERHEAD
483 bl unrecoverable_exception
487 EXC_REAL_OOL(data_access, 0x300, 0x80)
488 EXC_VIRT(data_access, 0x4300, 0x80, 0x300)
489 TRAMP_KVM_SKIP(PACA_EXGEN, 0x300)
491 EXC_COMMON_BEGIN(data_access_common)
493 * Here r13 points to the paca, r9 contains the saved CR,
494 * SRR0 and SRR1 are saved in r11 and r12,
495 * r9 - r13 are saved in paca->exgen.
498 std r10,PACA_EXGEN+EX_DAR(r13)
500 stw r10,PACA_EXGEN+EX_DSISR(r13)
501 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
502 RECONCILE_IRQ_STATE(r10, r11)
504 ld r3,PACA_EXGEN+EX_DAR(r13)
505 lwz r4,PACA_EXGEN+EX_DSISR(r13)
509 BEGIN_MMU_FTR_SECTION
510 b do_hash_page /* Try to handle as hpte fault */
513 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
516 EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80)
518 EXCEPTION_PROLOG_0(PACA_EXSLB)
519 b tramp_data_access_slb
520 EXC_REAL_END(data_access_slb, 0x380, 0x80)
522 TRAMP_REAL_BEGIN(tramp_data_access_slb)
523 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x380)
524 mr r12,r3 /* save r3 */
528 BRANCH_TO_COMMON(r10, slb_miss_common)
530 EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80)
532 EXCEPTION_PROLOG_0(PACA_EXSLB)
533 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
534 mr r12,r3 /* save r3 */
538 BRANCH_TO_COMMON(r10, slb_miss_common)
539 EXC_VIRT_END(data_access_slb, 0x4380, 0x80)
540 TRAMP_KVM_SKIP(PACA_EXSLB, 0x380)
543 EXC_REAL_OOL(instruction_access, 0x400, 0x80)
544 EXC_VIRT(instruction_access, 0x4400, 0x80, 0x400)
545 TRAMP_KVM(PACA_EXGEN, 0x400)
547 EXC_COMMON_BEGIN(instruction_access_common)
548 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
549 RECONCILE_IRQ_STATE(r10, r11)
552 andis. r4,r12,DSISR_SRR1_MATCH_64S@h
556 BEGIN_MMU_FTR_SECTION
557 b do_hash_page /* Try to handle as hpte fault */
560 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
563 EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80)
565 EXCEPTION_PROLOG_0(PACA_EXSLB)
566 b tramp_instruction_access_slb
567 EXC_REAL_END(instruction_access_slb, 0x480, 0x80)
569 TRAMP_REAL_BEGIN(tramp_instruction_access_slb)
570 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
571 mr r12,r3 /* save r3 */
572 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
575 BRANCH_TO_COMMON(r10, slb_miss_common)
577 EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80)
579 EXCEPTION_PROLOG_0(PACA_EXSLB)
580 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
581 mr r12,r3 /* save r3 */
582 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
585 BRANCH_TO_COMMON(r10, slb_miss_common)
586 EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80)
587 TRAMP_KVM(PACA_EXSLB, 0x480)
591 * This handler is used by the 0x380 and 0x480 SLB miss interrupts, as well as
592 * the virtual mode 0x4380 and 0x4480 interrupts if AIL is enabled.
594 EXC_COMMON_BEGIN(slb_miss_common)
596 * r13 points to the PACA, r9 contains the saved CR,
597 * r12 contains the saved r3,
598 * r11 contain the saved SRR1, SRR0 is still ready for return
599 * r3 has the faulting address
600 * r9 - r13 are saved in paca->exslb.
601 * cr6.eq is set for a D-SLB miss, clear for a I-SLB miss
602 * We assume we aren't going to take any exceptions during this
606 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
607 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
609 andi. r9,r11,MSR_PR // Check for exception from userspace
610 cmpdi cr4,r9,MSR_PR // And save the result in CR4 for later
613 * Test MSR_RI before calling slb_allocate_realmode, because the
614 * MSR in r11 gets clobbered. However we still want to allocate
615 * SLB in case MSR_RI=0, to minimise the risk of getting stuck in
616 * recursive SLB faults. So use cr5 for this, which is preserved.
618 andi. r11,r11,MSR_RI /* check for unrecoverable exception */
622 #ifdef CONFIG_PPC_STD_MMU_64
623 BEGIN_MMU_FTR_SECTION
625 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
628 ld r10,PACA_EXSLB+EX_LR(r13)
629 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
632 beq- 8f /* if bad address, make full stack frame */
634 bne- cr5,2f /* if unrecoverable exception, oops */
636 /* All done -- return from exception. */
638 bne cr4,1f /* returning to kernel */
643 mtcrf 0x08,r9 /* MSR[PR] indication is in cr4 */
644 mtcrf 0x04,r9 /* MSR[RI] indication is in cr5 */
645 mtcrf 0x02,r9 /* I/D indication is in cr6 */
646 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
649 RESTORE_CTR(r9, PACA_EXSLB)
650 RESTORE_PPR_PACA(PACA_EXSLB, r9)
652 ld r9,PACA_EXSLB+EX_R9(r13)
653 ld r10,PACA_EXSLB+EX_R10(r13)
654 ld r11,PACA_EXSLB+EX_R11(r13)
655 ld r12,PACA_EXSLB+EX_R12(r13)
656 ld r13,PACA_EXSLB+EX_R13(r13)
658 b . /* prevent speculative execution */
663 mtcrf 0x08,r9 /* MSR[PR] indication is in cr4 */
664 mtcrf 0x04,r9 /* MSR[RI] indication is in cr5 */
665 mtcrf 0x02,r9 /* I/D indication is in cr6 */
666 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
669 RESTORE_CTR(r9, PACA_EXSLB)
670 RESTORE_PPR_PACA(PACA_EXSLB, r9)
672 ld r9,PACA_EXSLB+EX_R9(r13)
673 ld r10,PACA_EXSLB+EX_R10(r13)
674 ld r11,PACA_EXSLB+EX_R11(r13)
675 ld r12,PACA_EXSLB+EX_R12(r13)
676 ld r13,PACA_EXSLB+EX_R13(r13)
678 b . /* prevent speculative execution */
681 2: std r3,PACA_EXSLB+EX_DAR(r13)
685 LOAD_HANDLER(r10,unrecov_slb)
692 8: std r3,PACA_EXSLB+EX_DAR(r13)
696 LOAD_HANDLER(r10,bad_addr_slb)
703 EXC_COMMON_BEGIN(unrecov_slb)
704 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
705 RECONCILE_IRQ_STATE(r10, r11)
707 1: addi r3,r1,STACK_FRAME_OVERHEAD
708 bl unrecoverable_exception
711 EXC_COMMON_BEGIN(bad_addr_slb)
712 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXSLB)
713 RECONCILE_IRQ_STATE(r10, r11)
714 ld r3, PACA_EXSLB+EX_DAR(r13)
717 li r10, 0x481 /* fix trap number for I-SLB miss */
720 addi r3, r1, STACK_FRAME_OVERHEAD
724 EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100)
725 .globl hardware_interrupt_hv;
726 hardware_interrupt_hv:
728 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common,
729 EXC_HV, SOFTEN_TEST_HV)
731 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common,
732 EXC_STD, SOFTEN_TEST_PR)
733 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
734 EXC_REAL_END(hardware_interrupt, 0x500, 0x100)
736 EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100)
737 .globl hardware_interrupt_relon_hv;
738 hardware_interrupt_relon_hv:
740 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_HV, SOFTEN_TEST_HV)
742 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt_common, EXC_STD, SOFTEN_TEST_PR)
743 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
744 EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100)
746 TRAMP_KVM(PACA_EXGEN, 0x500)
747 TRAMP_KVM_HV(PACA_EXGEN, 0x500)
748 EXC_COMMON_ASYNC(hardware_interrupt_common, 0x500, do_IRQ)
751 EXC_REAL(alignment, 0x600, 0x100)
752 EXC_VIRT(alignment, 0x4600, 0x100, 0x600)
753 TRAMP_KVM(PACA_EXGEN, 0x600)
754 EXC_COMMON_BEGIN(alignment_common)
756 std r10,PACA_EXGEN+EX_DAR(r13)
758 stw r10,PACA_EXGEN+EX_DSISR(r13)
759 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
760 ld r3,PACA_EXGEN+EX_DAR(r13)
761 lwz r4,PACA_EXGEN+EX_DSISR(r13)
765 RECONCILE_IRQ_STATE(r10, r11)
766 addi r3,r1,STACK_FRAME_OVERHEAD
767 bl alignment_exception
771 EXC_REAL(program_check, 0x700, 0x100)
772 EXC_VIRT(program_check, 0x4700, 0x100, 0x700)
773 TRAMP_KVM(PACA_EXGEN, 0x700)
774 EXC_COMMON_BEGIN(program_check_common)
776 * It's possible to receive a TM Bad Thing type program check with
777 * userspace register values (in particular r1), but with SRR1 reporting
778 * that we came from the kernel. Normally that would confuse the bad
779 * stack logic, and we would report a bad kernel stack pointer. Instead
780 * we switch to the emergency stack if we're taking a TM Bad Thing from
783 li r10,MSR_PR /* Build a mask of MSR_PR .. */
784 oris r10,r10,0x200000@h /* .. and SRR1_PROGTM */
785 and r10,r10,r12 /* Mask SRR1 with that. */
786 srdi r10,r10,8 /* Shift it so we can compare */
787 cmpldi r10,(0x200000 >> 8) /* .. with an immediate. */
788 bne 1f /* If != go to normal path. */
790 /* SRR1 had PR=0 and SRR1_PROGTM=1, so use the emergency stack */
791 andi. r10,r12,MSR_PR; /* Set CR0 correctly for label */
792 /* 3 in EXCEPTION_PROLOG_COMMON */
793 mr r10,r1 /* Save r1 */
794 ld r1,PACAEMERGSP(r13) /* Use emergency stack */
795 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
796 b 3f /* Jump into the macro !! */
797 1: EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
799 RECONCILE_IRQ_STATE(r10, r11)
800 addi r3,r1,STACK_FRAME_OVERHEAD
801 bl program_check_exception
805 EXC_REAL(fp_unavailable, 0x800, 0x100)
806 EXC_VIRT(fp_unavailable, 0x4800, 0x100, 0x800)
807 TRAMP_KVM(PACA_EXGEN, 0x800)
808 EXC_COMMON_BEGIN(fp_unavailable_common)
809 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
810 bne 1f /* if from user, just load it up */
812 RECONCILE_IRQ_STATE(r10, r11)
813 addi r3,r1,STACK_FRAME_OVERHEAD
814 bl kernel_fp_unavailable_exception
817 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
819 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
820 * transaction), go do TM stuff
822 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
824 END_FTR_SECTION_IFSET(CPU_FTR_TM)
827 b fast_exception_return
828 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
829 2: /* User process was in a transaction */
831 RECONCILE_IRQ_STATE(r10, r11)
832 addi r3,r1,STACK_FRAME_OVERHEAD
838 EXC_REAL_OOL_MASKABLE(decrementer, 0x900, 0x80)
839 EXC_VIRT_OOL_MASKABLE(decrementer, 0x4900, 0x80, 0x900)
840 TRAMP_KVM(PACA_EXGEN, 0x900)
841 EXC_COMMON_ASYNC(decrementer_common, 0x900, timer_interrupt)
844 EXC_REAL_OOL_HV(hdecrementer, 0x980, 0x80)
845 EXC_VIRT_OOL_HV(hdecrementer, 0x4980, 0x80, 0x980)
846 TRAMP_KVM_HV(PACA_EXGEN, 0x980)
847 EXC_COMMON(hdecrementer_common, 0x980, hdec_interrupt)
850 EXC_REAL_MASKABLE(doorbell_super, 0xa00, 0x100)
851 EXC_VIRT_MASKABLE(doorbell_super, 0x4a00, 0x100, 0xa00)
852 TRAMP_KVM(PACA_EXGEN, 0xa00)
853 #ifdef CONFIG_PPC_DOORBELL
854 EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, doorbell_exception)
856 EXC_COMMON_ASYNC(doorbell_super_common, 0xa00, unknown_exception)
860 EXC_REAL(trap_0b, 0xb00, 0x100)
861 EXC_VIRT(trap_0b, 0x4b00, 0x100, 0xb00)
862 TRAMP_KVM(PACA_EXGEN, 0xb00)
863 EXC_COMMON(trap_0b_common, 0xb00, unknown_exception)
866 * system call / hypercall (0xc00, 0x4c00)
868 * The system call exception is invoked with "sc 0" and does not alter HV bit.
869 * There is support for kernel code to invoke system calls but there are no
872 * The hypercall is invoked with "sc 1" and sets HV=1.
874 * In HPT, sc 1 always goes to 0xc00 real mode. In RADIX, sc 1 can go to
875 * 0x4c00 virtual mode.
879 * syscall register convention is in Documentation/powerpc/syscall64-abi.txt
881 * For hypercalls, the register convention is as follows:
884 * r3 volatile parameter and return value for status
885 * r4-r10 volatile input and output value
886 * r11 volatile hypercall number and output value
887 * r12 volatile input and output value
888 * r13-r31 nonvolatile
892 * CR0-1 CR5-7 volatile
894 * Other registers nonvolatile
896 * The intersection of volatile registers that don't contain possible
897 * inputs is: cr0, xer, ctr. We may use these as scratch regs upon entry
898 * without saving, though xer is not a good idea to use, as hardware may
899 * interpret some bits so it may be costly to change them.
901 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
903 * There is a little bit of juggling to get syscall and hcall
904 * working well. Save r13 in ctr to avoid using SPRG scratch
907 * Userspace syscalls have already saved the PPR, hcalls must save
908 * it before setting HMT_MEDIUM.
910 #define SYSCALL_KVMTEST \
913 std r10,PACA_EXGEN+EX_R10(r13); \
914 INTERRUPT_TO_KERNEL; \
915 KVMTEST_PR(0xc00); /* uses r10, branch to do_kvm_0xc00_system_call */ \
920 #define SYSCALL_KVMTEST \
927 #define LOAD_SYSCALL_HANDLER(reg) \
928 __LOAD_HANDLER(reg, system_call_common)
930 #define SYSCALL_FASTENDIAN_TEST \
934 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
937 * After SYSCALL_KVMTEST, we reach here with PACA in r13, r13 in r9,
940 #define SYSCALL_REAL \
941 mfspr r11,SPRN_SRR0 ; \
942 mfspr r12,SPRN_SRR1 ; \
943 LOAD_SYSCALL_HANDLER(r10) ; \
944 mtspr SPRN_SRR0,r10 ; \
945 ld r10,PACAKMSR(r13) ; \
946 mtspr SPRN_SRR1,r10 ; \
948 b . ; /* prevent speculative execution */
950 #define SYSCALL_FASTENDIAN \
951 /* Fast LE/BE switch system call */ \
952 1: mfspr r12,SPRN_SRR1 ; \
953 xori r12,r12,MSR_LE ; \
954 mtspr SPRN_SRR1,r12 ; \
956 RFI_TO_USER ; /* return to userspace */ \
957 b . ; /* prevent speculative execution */
959 #if defined(CONFIG_RELOCATABLE)
961 * We can't branch directly so we do it via the CTR which
962 * is volatile across system calls.
964 #define SYSCALL_VIRT \
965 LOAD_SYSCALL_HANDLER(r10) ; \
967 mfspr r11,SPRN_SRR0 ; \
968 mfspr r12,SPRN_SRR1 ; \
973 /* We can branch directly */
974 #define SYSCALL_VIRT \
975 mfspr r11,SPRN_SRR0 ; \
976 mfspr r12,SPRN_SRR1 ; \
978 mtmsrd r10,1 ; /* Set RI (EE=0) */ \
979 b system_call_common ;
982 EXC_REAL_BEGIN(system_call, 0xc00, 0x100)
983 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */
984 SYSCALL_FASTENDIAN_TEST
987 EXC_REAL_END(system_call, 0xc00, 0x100)
989 EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100)
990 SYSCALL_KVMTEST /* loads PACA into r13, and saves r13 to r9 */
991 SYSCALL_FASTENDIAN_TEST
994 EXC_VIRT_END(system_call, 0x4c00, 0x100)
996 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
998 * This is a hcall, so register convention is as above, with these
1002 * orig r10 saved in PACA
1004 TRAMP_KVM_BEGIN(do_kvm_0xc00)
1006 * Save the PPR (on systems that support it) before changing to
1007 * HMT_MEDIUM. That allows the KVM code to save that value into the
1008 * guest state (it is the guest's PPR value).
1010 OPT_GET_SPR(r10, SPRN_PPR, CPU_FTR_HAS_PPR)
1012 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r10, CPU_FTR_HAS_PPR)
1015 std r9,PACA_EXGEN+EX_R9(r13)
1017 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
1021 EXC_REAL(single_step, 0xd00, 0x100)
1022 EXC_VIRT(single_step, 0x4d00, 0x100, 0xd00)
1023 TRAMP_KVM(PACA_EXGEN, 0xd00)
1024 EXC_COMMON(single_step_common, 0xd00, single_step_exception)
1026 EXC_REAL_OOL_HV(h_data_storage, 0xe00, 0x20)
1027 EXC_VIRT_OOL_HV(h_data_storage, 0x4e00, 0x20, 0xe00)
1028 TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0xe00)
1029 EXC_COMMON_BEGIN(h_data_storage_common)
1031 std r10,PACA_EXGEN+EX_DAR(r13)
1032 mfspr r10,SPRN_HDSISR
1033 stw r10,PACA_EXGEN+EX_DSISR(r13)
1034 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
1036 RECONCILE_IRQ_STATE(r10, r11)
1037 addi r3,r1,STACK_FRAME_OVERHEAD
1038 bl unknown_exception
1042 EXC_REAL_OOL_HV(h_instr_storage, 0xe20, 0x20)
1043 EXC_VIRT_OOL_HV(h_instr_storage, 0x4e20, 0x20, 0xe20)
1044 TRAMP_KVM_HV(PACA_EXGEN, 0xe20)
1045 EXC_COMMON(h_instr_storage_common, 0xe20, unknown_exception)
1048 EXC_REAL_OOL_HV(emulation_assist, 0xe40, 0x20)
1049 EXC_VIRT_OOL_HV(emulation_assist, 0x4e40, 0x20, 0xe40)
1050 TRAMP_KVM_HV(PACA_EXGEN, 0xe40)
1051 EXC_COMMON(emulation_assist_common, 0xe40, emulation_assist_interrupt)
1055 * hmi_exception trampoline is a special case. It jumps to hmi_exception_early
1056 * first, and then eventaully from there to the trampoline to get into virtual
1059 __EXC_REAL_OOL_HV_DIRECT(hmi_exception, 0xe60, 0x20, hmi_exception_early)
1060 __TRAMP_REAL_OOL_MASKABLE_HV(hmi_exception, 0xe60)
1061 EXC_VIRT_NONE(0x4e60, 0x20)
1062 TRAMP_KVM_HV(PACA_EXGEN, 0xe60)
1063 TRAMP_REAL_BEGIN(hmi_exception_early)
1064 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, 0xe60)
1065 mr r10,r1 /* Save r1 */
1066 ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */
1067 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
1068 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
1069 mfspr r12,SPRN_HSRR1 /* Save HSRR1 */
1070 EXCEPTION_PROLOG_COMMON_1()
1071 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
1072 EXCEPTION_PROLOG_COMMON_3(0xe60)
1073 addi r3,r1,STACK_FRAME_OVERHEAD
1074 BRANCH_LINK_TO_FAR(hmi_exception_realmode) /* Function call ABI */
1075 /* Windup the stack. */
1076 /* Move original HSRR0 and HSRR1 into the respective regs */
1094 /* restore original r1. */
1098 * Go to virtual mode and pull the HMI event information from
1101 .globl hmi_exception_after_realmode
1102 hmi_exception_after_realmode:
1104 EXCEPTION_PROLOG_0(PACA_EXGEN)
1105 b tramp_real_hmi_exception
1107 EXC_COMMON_ASYNC(hmi_exception_common, 0xe60, handle_hmi_exception)
1110 EXC_REAL_OOL_MASKABLE_HV(h_doorbell, 0xe80, 0x20)
1111 EXC_VIRT_OOL_MASKABLE_HV(h_doorbell, 0x4e80, 0x20, 0xe80)
1112 TRAMP_KVM_HV(PACA_EXGEN, 0xe80)
1113 #ifdef CONFIG_PPC_DOORBELL
1114 EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, doorbell_exception)
1116 EXC_COMMON_ASYNC(h_doorbell_common, 0xe80, unknown_exception)
1120 EXC_REAL_OOL_MASKABLE_HV(h_virt_irq, 0xea0, 0x20)
1121 EXC_VIRT_OOL_MASKABLE_HV(h_virt_irq, 0x4ea0, 0x20, 0xea0)
1122 TRAMP_KVM_HV(PACA_EXGEN, 0xea0)
1123 EXC_COMMON_ASYNC(h_virt_irq_common, 0xea0, do_IRQ)
1126 EXC_REAL_NONE(0xec0, 0x20)
1127 EXC_VIRT_NONE(0x4ec0, 0x20)
1128 EXC_REAL_NONE(0xee0, 0x20)
1129 EXC_VIRT_NONE(0x4ee0, 0x20)
1132 EXC_REAL_OOL(performance_monitor, 0xf00, 0x20)
1133 EXC_VIRT_OOL(performance_monitor, 0x4f00, 0x20, 0xf00)
1134 TRAMP_KVM(PACA_EXGEN, 0xf00)
1135 EXC_COMMON_ASYNC(performance_monitor_common, 0xf00, performance_monitor_exception)
1138 EXC_REAL_OOL(altivec_unavailable, 0xf20, 0x20)
1139 EXC_VIRT_OOL(altivec_unavailable, 0x4f20, 0x20, 0xf20)
1140 TRAMP_KVM(PACA_EXGEN, 0xf20)
1141 EXC_COMMON_BEGIN(altivec_unavailable_common)
1142 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1143 #ifdef CONFIG_ALTIVEC
1146 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1147 BEGIN_FTR_SECTION_NESTED(69)
1148 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1149 * transaction), go do TM stuff
1151 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1153 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1156 b fast_exception_return
1157 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1158 2: /* User process was in a transaction */
1160 RECONCILE_IRQ_STATE(r10, r11)
1161 addi r3,r1,STACK_FRAME_OVERHEAD
1162 bl altivec_unavailable_tm
1166 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1169 RECONCILE_IRQ_STATE(r10, r11)
1170 addi r3,r1,STACK_FRAME_OVERHEAD
1171 bl altivec_unavailable_exception
1175 EXC_REAL_OOL(vsx_unavailable, 0xf40, 0x20)
1176 EXC_VIRT_OOL(vsx_unavailable, 0x4f40, 0x20, 0xf40)
1177 TRAMP_KVM(PACA_EXGEN, 0xf40)
1178 EXC_COMMON_BEGIN(vsx_unavailable_common)
1179 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
1183 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1184 BEGIN_FTR_SECTION_NESTED(69)
1185 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1186 * transaction), go do TM stuff
1188 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1190 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1193 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1194 2: /* User process was in a transaction */
1196 RECONCILE_IRQ_STATE(r10, r11)
1197 addi r3,r1,STACK_FRAME_OVERHEAD
1198 bl vsx_unavailable_tm
1202 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
1205 RECONCILE_IRQ_STATE(r10, r11)
1206 addi r3,r1,STACK_FRAME_OVERHEAD
1207 bl vsx_unavailable_exception
1211 EXC_REAL_OOL(facility_unavailable, 0xf60, 0x20)
1212 EXC_VIRT_OOL(facility_unavailable, 0x4f60, 0x20, 0xf60)
1213 TRAMP_KVM(PACA_EXGEN, 0xf60)
1214 EXC_COMMON(facility_unavailable_common, 0xf60, facility_unavailable_exception)
1217 EXC_REAL_OOL_HV(h_facility_unavailable, 0xf80, 0x20)
1218 EXC_VIRT_OOL_HV(h_facility_unavailable, 0x4f80, 0x20, 0xf80)
1219 TRAMP_KVM_HV(PACA_EXGEN, 0xf80)
1220 EXC_COMMON(h_facility_unavailable_common, 0xf80, facility_unavailable_exception)
1223 EXC_REAL_NONE(0xfa0, 0x20)
1224 EXC_VIRT_NONE(0x4fa0, 0x20)
1225 EXC_REAL_NONE(0xfc0, 0x20)
1226 EXC_VIRT_NONE(0x4fc0, 0x20)
1227 EXC_REAL_NONE(0xfe0, 0x20)
1228 EXC_VIRT_NONE(0x4fe0, 0x20)
1230 EXC_REAL_NONE(0x1000, 0x100)
1231 EXC_VIRT_NONE(0x5000, 0x100)
1232 EXC_REAL_NONE(0x1100, 0x100)
1233 EXC_VIRT_NONE(0x5100, 0x100)
1235 #ifdef CONFIG_CBE_RAS
1236 EXC_REAL_HV(cbe_system_error, 0x1200, 0x100)
1237 EXC_VIRT_NONE(0x5200, 0x100)
1238 TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1200)
1239 EXC_COMMON(cbe_system_error_common, 0x1200, cbe_system_error_exception)
1240 #else /* CONFIG_CBE_RAS */
1241 EXC_REAL_NONE(0x1200, 0x100)
1242 EXC_VIRT_NONE(0x5200, 0x100)
1246 EXC_REAL(instruction_breakpoint, 0x1300, 0x100)
1247 EXC_VIRT(instruction_breakpoint, 0x5300, 0x100, 0x1300)
1248 TRAMP_KVM_SKIP(PACA_EXGEN, 0x1300)
1249 EXC_COMMON(instruction_breakpoint_common, 0x1300, instruction_breakpoint_exception)
1251 EXC_REAL_NONE(0x1400, 0x100)
1252 EXC_VIRT_NONE(0x5400, 0x100)
1254 EXC_REAL_BEGIN(denorm_exception_hv, 0x1500, 0x100)
1255 mtspr SPRN_SPRG_HSCRATCH0,r13
1256 EXCEPTION_PROLOG_0(PACA_EXGEN)
1257 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
1259 #ifdef CONFIG_PPC_DENORMALISATION
1260 mfspr r10,SPRN_HSRR1
1261 mfspr r11,SPRN_HSRR0 /* save HSRR0 */
1262 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
1263 addi r11,r11,-4 /* HSRR0 is next instruction */
1268 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
1269 EXC_REAL_END(denorm_exception_hv, 0x1500, 0x100)
1271 #ifdef CONFIG_PPC_DENORMALISATION
1272 EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100)
1273 b exc_real_0x1500_denorm_exception_hv
1274 EXC_VIRT_END(denorm_exception, 0x5500, 0x100)
1276 EXC_VIRT_NONE(0x5500, 0x100)
1279 TRAMP_KVM_SKIP(PACA_EXGEN, 0x1500)
1281 #ifdef CONFIG_PPC_DENORMALISATION
1282 TRAMP_REAL_BEGIN(denorm_assist)
1285 * To denormalise we need to move a copy of the register to itself.
1286 * For POWER6 do that here for all FP regs.
1289 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
1290 xori r10,r10,(MSR_FE0|MSR_FE1)
1294 #define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
1295 #define FMR4(n) FMR2(n) ; FMR2(n+2)
1296 #define FMR8(n) FMR4(n) ; FMR4(n+4)
1297 #define FMR16(n) FMR8(n) ; FMR8(n+8)
1298 #define FMR32(n) FMR16(n) ; FMR16(n+16)
1303 * To denormalise we need to move a copy of the register to itself.
1304 * For POWER7 do that here for the first 32 VSX registers only.
1307 oris r10,r10,MSR_VSX@h
1311 #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
1312 #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
1313 #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
1314 #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
1315 #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
1318 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
1322 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
1324 * To denormalise we need to move a copy of the register to itself.
1325 * For POWER8 we need to do that for all 64 VSX registers
1329 mtspr SPRN_HSRR0,r11
1331 ld r9,PACA_EXGEN+EX_R9(r13)
1332 RESTORE_PPR_PACA(PACA_EXGEN, r10)
1334 ld r10,PACA_EXGEN+EX_CFAR(r13)
1336 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1337 ld r10,PACA_EXGEN+EX_R10(r13)
1338 ld r11,PACA_EXGEN+EX_R11(r13)
1339 ld r12,PACA_EXGEN+EX_R12(r13)
1340 ld r13,PACA_EXGEN+EX_R13(r13)
1345 EXC_COMMON_HV(denorm_common, 0x1500, unknown_exception)
1348 #ifdef CONFIG_CBE_RAS
1349 EXC_REAL_HV(cbe_maintenance, 0x1600, 0x100)
1350 EXC_VIRT_NONE(0x5600, 0x100)
1351 TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1600)
1352 EXC_COMMON(cbe_maintenance_common, 0x1600, cbe_maintenance_exception)
1353 #else /* CONFIG_CBE_RAS */
1354 EXC_REAL_NONE(0x1600, 0x100)
1355 EXC_VIRT_NONE(0x5600, 0x100)
1359 EXC_REAL(altivec_assist, 0x1700, 0x100)
1360 EXC_VIRT(altivec_assist, 0x5700, 0x100, 0x1700)
1361 TRAMP_KVM(PACA_EXGEN, 0x1700)
1362 #ifdef CONFIG_ALTIVEC
1363 EXC_COMMON(altivec_assist_common, 0x1700, altivec_assist_exception)
1365 EXC_COMMON(altivec_assist_common, 0x1700, unknown_exception)
1369 #ifdef CONFIG_CBE_RAS
1370 EXC_REAL_HV(cbe_thermal, 0x1800, 0x100)
1371 EXC_VIRT_NONE(0x5800, 0x100)
1372 TRAMP_KVM_HV_SKIP(PACA_EXGEN, 0x1800)
1373 EXC_COMMON(cbe_thermal_common, 0x1800, cbe_thermal_exception)
1374 #else /* CONFIG_CBE_RAS */
1375 EXC_REAL_NONE(0x1800, 0x100)
1376 EXC_VIRT_NONE(0x5800, 0x100)
1379 #ifdef CONFIG_PPC_WATCHDOG
1381 #define MASKED_DEC_HANDLER_LABEL 3f
1383 #define MASKED_DEC_HANDLER(_H) \
1385 std r12,PACA_EXGEN+EX_R12(r13); \
1386 GET_SCRATCH0(r10); \
1387 std r10,PACA_EXGEN+EX_R13(r13); \
1388 EXCEPTION_PROLOG_PSERIES_1(soft_nmi_common, _H)
1391 * Branch to soft_nmi_interrupt using the emergency stack. The emergency
1392 * stack is one that is usable by maskable interrupts so long as MSR_EE
1393 * remains off. It is used for recovery when something has corrupted the
1394 * normal kernel stack, for example. The "soft NMI" must not use the process
1395 * stack because we want irq disabled sections to avoid touching the stack
1396 * at all (other than PMU interrupts), so use the emergency stack for this,
1397 * and run it entirely with interrupts hard disabled.
1399 EXC_COMMON_BEGIN(soft_nmi_common)
1401 ld r1,PACAEMERGSP(r13)
1402 subi r1,r1,INT_FRAME_SIZE
1403 EXCEPTION_COMMON_NORET_STACK(PACA_EXGEN, 0x900,
1404 system_reset, soft_nmi_interrupt,
1405 ADD_NVGPRS;ADD_RECONCILE)
1408 #else /* CONFIG_PPC_WATCHDOG */
1409 #define MASKED_DEC_HANDLER_LABEL 2f /* normal return */
1410 #define MASKED_DEC_HANDLER(_H)
1411 #endif /* CONFIG_PPC_WATCHDOG */
1414 * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
1415 * - If it was a decrementer interrupt, we bump the dec to max and and return.
1416 * - If it was a doorbell we return immediately since doorbells are edge
1417 * triggered and won't automatically refire.
1418 * - If it was a HMI we return immediately since we handled it in realmode
1419 * and it won't refire.
1420 * - else we hard disable and return.
1421 * This is called with r10 containing the value to OR to the paca field.
1423 #define MASKED_INTERRUPT(_H) \
1424 masked_##_H##interrupt: \
1425 std r11,PACA_EXGEN+EX_R11(r13); \
1426 lbz r11,PACAIRQHAPPENED(r13); \
1428 stb r11,PACAIRQHAPPENED(r13); \
1429 cmpwi r10,PACA_IRQ_DEC; \
1432 ori r10,r10,0xffff; \
1433 mtspr SPRN_DEC,r10; \
1434 b MASKED_DEC_HANDLER_LABEL; \
1435 1: andi. r10,r10,(PACA_IRQ_DBELL|PACA_IRQ_HMI); \
1437 mfspr r10,SPRN_##_H##SRR1; \
1438 xori r10,r10,MSR_EE; /* clear MSR_EE */ \
1439 mtspr SPRN_##_H##SRR1,r10; \
1441 ld r9,PACA_EXGEN+EX_R9(r13); \
1442 ld r10,PACA_EXGEN+EX_R10(r13); \
1443 ld r11,PACA_EXGEN+EX_R11(r13); \
1444 /* returns to kernel where r13 must be set up, so don't restore it */ \
1445 ##_H##RFI_TO_KERNEL; \
1447 MASKED_DEC_HANDLER(_H)
1449 TRAMP_REAL_BEGIN(stf_barrier_fallback)
1450 std r9,PACA_EXRFI+EX_R9(r13)
1451 std r10,PACA_EXRFI+EX_R10(r13)
1453 ld r9,PACA_EXRFI+EX_R9(r13)
1454 ld r10,PACA_EXRFI+EX_R10(r13)
1462 /* Clobbers r10, r11, ctr */
1463 .macro L1D_DISPLACEMENT_FLUSH
1464 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13)
1465 ld r11,PACA_L1D_FLUSH_SIZE(r13)
1466 srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */
1468 DCBT_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */
1470 /* order ld/st prior to dcbt stop all streams with flushing */
1474 * The load addresses are at staggered offsets within cachelines,
1475 * which suits some pipelines better (on others it should not
1479 ld r11,(0x80 + 8)*0(r10)
1480 ld r11,(0x80 + 8)*1(r10)
1481 ld r11,(0x80 + 8)*2(r10)
1482 ld r11,(0x80 + 8)*3(r10)
1483 ld r11,(0x80 + 8)*4(r10)
1484 ld r11,(0x80 + 8)*5(r10)
1485 ld r11,(0x80 + 8)*6(r10)
1486 ld r11,(0x80 + 8)*7(r10)
1491 TRAMP_REAL_BEGIN(entry_flush_fallback)
1492 std r9,PACA_EXRFI+EX_R9(r13)
1493 std r10,PACA_EXRFI+EX_R10(r13)
1494 std r11,PACA_EXRFI+EX_R11(r13)
1496 L1D_DISPLACEMENT_FLUSH
1498 ld r9,PACA_EXRFI+EX_R9(r13)
1499 ld r10,PACA_EXRFI+EX_R10(r13)
1500 ld r11,PACA_EXRFI+EX_R11(r13)
1503 TRAMP_REAL_BEGIN(rfi_flush_fallback)
1506 std r1,PACA_EXRFI+EX_R12(r13)
1507 ld r1,PACAKSAVE(r13)
1508 std r9,PACA_EXRFI+EX_R9(r13)
1509 std r10,PACA_EXRFI+EX_R10(r13)
1510 std r11,PACA_EXRFI+EX_R11(r13)
1512 L1D_DISPLACEMENT_FLUSH
1514 ld r9,PACA_EXRFI+EX_R9(r13)
1515 ld r10,PACA_EXRFI+EX_R10(r13)
1516 ld r11,PACA_EXRFI+EX_R11(r13)
1517 ld r1,PACA_EXRFI+EX_R12(r13)
1521 TRAMP_REAL_BEGIN(hrfi_flush_fallback)
1524 std r1,PACA_EXRFI+EX_R12(r13)
1525 ld r1,PACAKSAVE(r13)
1526 std r9,PACA_EXRFI+EX_R9(r13)
1527 std r10,PACA_EXRFI+EX_R10(r13)
1528 std r11,PACA_EXRFI+EX_R11(r13)
1530 L1D_DISPLACEMENT_FLUSH
1532 ld r9,PACA_EXRFI+EX_R9(r13)
1533 ld r10,PACA_EXRFI+EX_R10(r13)
1534 ld r11,PACA_EXRFI+EX_R11(r13)
1535 ld r1,PACA_EXRFI+EX_R12(r13)
1541 _GLOBAL(do_uaccess_flush)
1542 UACCESS_FLUSH_FIXUP_SECTION
1547 L1D_DISPLACEMENT_FLUSH
1549 _ASM_NOKPROBE_SYMBOL(do_uaccess_flush)
1550 EXPORT_SYMBOL(do_uaccess_flush)
1553 * Real mode exceptions actually use this too, but alternate
1554 * instruction code patches (which end up in the common .text area)
1555 * cannot reach these if they are put there.
1557 USE_FIXED_SECTION(virt_trampolines)
1561 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
1562 TRAMP_REAL_BEGIN(kvmppc_skip_interrupt)
1564 * Here all GPRs are unchanged from when the interrupt happened
1565 * except for r13, which is saved in SPRG_SCRATCH0.
1567 mfspr r13, SPRN_SRR0
1569 mtspr SPRN_SRR0, r13
1574 TRAMP_REAL_BEGIN(kvmppc_skip_Hinterrupt)
1576 * Here all GPRs are unchanged from when the interrupt happened
1577 * except for r13, which is saved in SPRG_SCRATCH0.
1579 mfspr r13, SPRN_HSRR0
1581 mtspr SPRN_HSRR0, r13
1588 * Ensure that any handlers that get invoked from the exception prologs
1589 * above are below the first 64KB (0x10000) of the kernel image because
1590 * the prologs assemble the addresses of these handlers using the
1591 * LOAD_HANDLER macro, which uses an ori instruction.
1594 /*** Common interrupt handlers ***/
1598 * Relocation-on interrupts: A subset of the interrupts can be delivered
1599 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
1600 * it. Addresses are the same as the original interrupt addresses, but
1601 * offset by 0xc000000000004000.
1602 * It's impossible to receive interrupts below 0x300 via this mechanism.
1603 * KVM: None of these traps are from the guest ; anything that escalated
1604 * to HV=1 from HV=0 is delivered via real mode handlers.
1608 * This uses the standard macro, since the original 0x300 vector
1609 * only has extra guff for STAB-based processors -- which never
1613 EXC_COMMON_BEGIN(ppc64_runlatch_on_trampoline)
1614 b __ppc64_runlatch_on
1616 USE_FIXED_SECTION(virt_trampolines)
1618 * The __end_interrupts marker must be past the out-of-line (OOL)
1619 * handlers, so that they are copied to real address 0x100 when running
1620 * a relocatable kernel. This ensures they can be reached from the short
1621 * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch
1622 * directly, without using LOAD_HANDLER().
1625 .globl __end_interrupts
1627 DEFINE_FIXED_SYMBOL(__end_interrupts)
1629 #ifdef CONFIG_PPC_970_NAP
1630 EXC_COMMON_BEGIN(power4_fixup_nap)
1632 std r9,TI_LOCAL_FLAGS(r11)
1633 ld r10,_LINK(r1) /* make idle task do the */
1634 std r10,_NIP(r1) /* equivalent of a blr */
1638 CLOSE_FIXED_SECTION(real_vectors);
1639 CLOSE_FIXED_SECTION(real_trampolines);
1640 CLOSE_FIXED_SECTION(virt_vectors);
1641 CLOSE_FIXED_SECTION(virt_trampolines);
1648 .balign IFETCH_ALIGN_BYTES
1650 #ifdef CONFIG_PPC_STD_MMU_64
1651 lis r0,(DSISR_BAD_FAULT_64S|DSISR_DABRMATCH)@h
1652 ori r0,r0,DSISR_BAD_FAULT_64S@l
1653 and. r0,r4,r0 /* weird error? */
1654 bne- handle_page_fault /* if not, try to insert a HPTE */
1655 CURRENT_THREAD_INFO(r11, r1)
1656 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
1657 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
1658 bne 77f /* then don't call hash_page now */
1661 * r3 contains the faulting address
1663 * r5 contains the trap number
1666 * at return r3 = 0 for success, 1 for page fault, negative for error
1670 bl __hash_page /* build HPTE if possible */
1671 cmpdi r3,0 /* see if __hash_page succeeded */
1674 beq fast_exc_return_irq /* Return from exception on success */
1679 /* Reload DSISR into r4 for the DABR check below */
1681 #endif /* CONFIG_PPC_STD_MMU_64 */
1683 /* Here we have a page fault that hash_page can't handle. */
1685 11: andis. r0,r4,DSISR_DABRMATCH@h
1686 bne- handle_dabr_fault
1689 addi r3,r1,STACK_FRAME_OVERHEAD
1692 beq+ ret_from_except_lite
1695 addi r3,r1,STACK_FRAME_OVERHEAD
1700 /* We have a data breakpoint exception - handle it */
1705 addi r3,r1,STACK_FRAME_OVERHEAD
1708 * do_break() may have changed the NV GPRS while handling a breakpoint.
1709 * If so, we need to restore them with their updated values. Don't use
1710 * ret_from_except_lite here.
1715 #ifdef CONFIG_PPC_STD_MMU_64
1716 /* We have a page fault that hash_page could handle but HV refused
1721 addi r3,r1,STACK_FRAME_OVERHEAD
1728 * We come here as a result of a DSI at a point where we don't want
1729 * to call hash_page, such as when we are accessing memory (possibly
1730 * user memory) inside a PMU interrupt that occurred while interrupts
1731 * were soft-disabled. We want to invoke the exception handler for
1732 * the access, or panic if there isn't a handler.
1736 addi r3,r1,STACK_FRAME_OVERHEAD
1742 * Here we have detected that the kernel stack pointer is bad.
1743 * R9 contains the saved CR, r13 points to the paca,
1744 * r10 contains the (bad) kernel stack pointer,
1745 * r11 and r12 contain the saved SRR0 and SRR1.
1746 * We switch to using an emergency stack, save the registers there,
1747 * and call kernel_bad_stack(), which panics.
1750 ld r1,PACAEMERGSP(r13)
1751 subi r1,r1,64+INT_FRAME_SIZE
1757 mfspr r12,SPRN_DSISR
1783 std r10,ORIG_GPR3(r1)
1784 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1787 lhz r12,PACA_TRAP_SAVE(r13)
1789 addi r11,r1,INT_FRAME_SIZE
1794 ld r11,exception_marker@toc(r2)
1796 std r11,STACK_FRAME_OVERHEAD-16(r1)
1797 1: addi r3,r1,STACK_FRAME_OVERHEAD
1800 _ASM_NOKPROBE_SYMBOL(bad_stack);
1803 * When doorbell is triggered from system reset wakeup, the message is
1804 * not cleared, so it would fire again when EE is enabled.
1806 * When coming from local_irq_enable, there may be the same problem if
1807 * we were hard disabled.
1809 * Execute msgclr to clear pending exceptions before handling it.
1811 h_doorbell_common_msgclr:
1812 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36))
1816 doorbell_super_common_msgclr:
1817 LOAD_REG_IMMEDIATE(r3, PPC_DBELL_MSGTYPE << (63-36))
1819 b doorbell_super_common
1822 * Called from arch_local_irq_enable when an interrupt needs
1823 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
1824 * which kind of interrupt. MSR:EE is already off. We generate a
1825 * stackframe like if a real interrupt had happened.
1827 * Note: While MSR:EE is off, we need to make sure that _MSR
1828 * in the generated frame has EE set to 1 or the exception
1829 * handler will not properly re-enable them.
1831 * Note that we don't specify LR as the NIP (return address) for
1832 * the interrupt because that would unbalance the return branch
1835 _GLOBAL(__replay_interrupt)
1836 /* We are going to jump to the exception common code which
1837 * will retrieve various register values from the PACA which
1838 * we don't give a damn about, so we don't bother storing them.
1841 LOAD_REG_ADDR(r11, replay_interrupt_return)
1845 beq decrementer_common
1848 beq h_virt_irq_common
1850 beq hardware_interrupt_common
1851 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_300)
1854 beq h_doorbell_common_msgclr
1856 beq hmi_exception_common
1859 beq doorbell_super_common_msgclr
1860 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
1861 replay_interrupt_return:
1864 _ASM_NOKPROBE_SYMBOL(__replay_interrupt)