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Merge tag 'powerpc-4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[deliverable/linux.git] / arch / powerpc / kernel / exceptions-64s.S
1 /*
2 * This file contains the 64-bit "server" PowerPC variant
3 * of the low level exception handling including exception
4 * vectors, exception return, part of the slb and stab
5 * handling and other fixed offset specific things.
6 *
7 * This file is meant to be #included from head_64.S due to
8 * position dependent assembly.
9 *
10 * Most of this originates from head_64.S and thus has the same
11 * copyright history.
12 *
13 */
14
15 #include <asm/hw_irq.h>
16 #include <asm/exception-64s.h>
17 #include <asm/ptrace.h>
18 #include <asm/cpuidle.h>
19
20 /*
21 * We layout physical memory as follows:
22 * 0x0000 - 0x00ff : Secondary processor spin code
23 * 0x0100 - 0x17ff : pSeries Interrupt prologs
24 * 0x1800 - 0x4000 : interrupt support common interrupt prologs
25 * 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1
26 * 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1
27 * 0x7000 - 0x7fff : FWNMI data area
28 * 0x8000 - 0x8fff : Initial (CPU0) segment table
29 * 0x9000 - : Early init and support code
30 */
31 /* Syscall routine is used twice, in reloc-off and reloc-on paths */
32 #define SYSCALL_PSERIES_1 \
33 BEGIN_FTR_SECTION \
34 cmpdi r0,0x1ebe ; \
35 beq- 1f ; \
36 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
37 mr r9,r13 ; \
38 GET_PACA(r13) ; \
39 mfspr r11,SPRN_SRR0 ; \
40 0:
41
42 #define SYSCALL_PSERIES_2_RFID \
43 mfspr r12,SPRN_SRR1 ; \
44 ld r10,PACAKBASE(r13) ; \
45 LOAD_HANDLER(r10, system_call_entry) ; \
46 mtspr SPRN_SRR0,r10 ; \
47 ld r10,PACAKMSR(r13) ; \
48 mtspr SPRN_SRR1,r10 ; \
49 rfid ; \
50 b . ; /* prevent speculative execution */
51
52 #define SYSCALL_PSERIES_3 \
53 /* Fast LE/BE switch system call */ \
54 1: mfspr r12,SPRN_SRR1 ; \
55 xori r12,r12,MSR_LE ; \
56 mtspr SPRN_SRR1,r12 ; \
57 rfid ; /* return to userspace */ \
58 b . ; /* prevent speculative execution */
59
60 #if defined(CONFIG_RELOCATABLE)
61 /*
62 * We can't branch directly so we do it via the CTR which
63 * is volatile across system calls.
64 */
65 #define SYSCALL_PSERIES_2_DIRECT \
66 mflr r10 ; \
67 ld r12,PACAKBASE(r13) ; \
68 LOAD_HANDLER(r12, system_call_entry) ; \
69 mtctr r12 ; \
70 mfspr r12,SPRN_SRR1 ; \
71 /* Re-use of r13... No spare regs to do this */ \
72 li r13,MSR_RI ; \
73 mtmsrd r13,1 ; \
74 GET_PACA(r13) ; /* get r13 back */ \
75 bctr ;
76 #else
77 /* We can branch directly */
78 #define SYSCALL_PSERIES_2_DIRECT \
79 mfspr r12,SPRN_SRR1 ; \
80 li r10,MSR_RI ; \
81 mtmsrd r10,1 ; /* Set RI (EE=0) */ \
82 b system_call_common ;
83 #endif
84
85 /*
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.
92 */
93 . = 0x100
94 .globl __start_interrupts
95 __start_interrupts:
96
97 .globl system_reset_pSeries;
98 system_reset_pSeries:
99 SET_SCRATCH0(r13)
100 #ifdef CONFIG_PPC_P7_NAP
101 BEGIN_FTR_SECTION
102 /* Running native on arch 2.06 or later, check if we are
103 * waking up from nap/sleep/winkle.
104 */
105 mfspr r13,SPRN_SRR1
106 rlwinm. r13,r13,47-31,30,31
107 beq 9f
108
109 cmpwi cr3,r13,2
110 GET_PACA(r13)
111 bl pnv_restore_hyp_resource
112
113 li r0,PNV_THREAD_RUNNING
114 stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */
115
116 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
117 li r0,KVM_HWTHREAD_IN_KERNEL
118 stb r0,HSTATE_HWTHREAD_STATE(r13)
119 /* Order setting hwthread_state vs. testing hwthread_req */
120 sync
121 lbz r0,HSTATE_HWTHREAD_REQ(r13)
122 cmpwi r0,0
123 beq 1f
124 b kvm_start_guest
125 1:
126 #endif
127
128 /* Return SRR1 from power7_nap() */
129 mfspr r3,SPRN_SRR1
130 blt cr3,2f
131 b pnv_wakeup_loss
132 2: b pnv_wakeup_noloss
133
134 9:
135 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
136 #endif /* CONFIG_PPC_P7_NAP */
137 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
138 NOTEST, 0x100)
139
140 . = 0x200
141 machine_check_pSeries_1:
142 /* This is moved out of line as it can be patched by FW, but
143 * some code path might still want to branch into the original
144 * vector
145 */
146 SET_SCRATCH0(r13) /* save r13 */
147 #ifdef CONFIG_PPC_P7_NAP
148 BEGIN_FTR_SECTION
149 /* Running native on arch 2.06 or later, check if we are
150 * waking up from nap. We only handle no state loss and
151 * supervisor state loss. We do -not- handle hypervisor
152 * state loss at this time.
153 */
154 mfspr r13,SPRN_SRR1
155 rlwinm. r13,r13,47-31,30,31
156 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
157 beq 9f
158
159 mfspr r13,SPRN_SRR1
160 rlwinm. r13,r13,47-31,30,31
161 /* waking up from powersave (nap) state */
162 cmpwi cr1,r13,2
163 /* Total loss of HV state is fatal. let's just stay stuck here */
164 OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
165 bgt cr1,.
166 9:
167 OPT_SET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
168 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
169 #endif /* CONFIG_PPC_P7_NAP */
170 EXCEPTION_PROLOG_0(PACA_EXMC)
171 BEGIN_FTR_SECTION
172 b machine_check_powernv_early
173 FTR_SECTION_ELSE
174 b machine_check_pSeries_0
175 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
176
177 . = 0x300
178 .globl data_access_pSeries
179 data_access_pSeries:
180 SET_SCRATCH0(r13)
181 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
182 KVMTEST, 0x300)
183
184 . = 0x380
185 .globl data_access_slb_pSeries
186 data_access_slb_pSeries:
187 SET_SCRATCH0(r13)
188 EXCEPTION_PROLOG_0(PACA_EXSLB)
189 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
190 std r3,PACA_EXSLB+EX_R3(r13)
191 mfspr r3,SPRN_DAR
192 mfspr r12,SPRN_SRR1
193 #ifndef CONFIG_RELOCATABLE
194 b slb_miss_realmode
195 #else
196 /*
197 * We can't just use a direct branch to slb_miss_realmode
198 * because the distance from here to there depends on where
199 * the kernel ends up being put.
200 */
201 mfctr r11
202 ld r10,PACAKBASE(r13)
203 LOAD_HANDLER(r10, slb_miss_realmode)
204 mtctr r10
205 bctr
206 #endif
207
208 STD_EXCEPTION_PSERIES(0x400, instruction_access)
209
210 . = 0x480
211 .globl instruction_access_slb_pSeries
212 instruction_access_slb_pSeries:
213 SET_SCRATCH0(r13)
214 EXCEPTION_PROLOG_0(PACA_EXSLB)
215 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x480)
216 std r3,PACA_EXSLB+EX_R3(r13)
217 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
218 mfspr r12,SPRN_SRR1
219 #ifndef CONFIG_RELOCATABLE
220 b slb_miss_realmode
221 #else
222 mfctr r11
223 ld r10,PACAKBASE(r13)
224 LOAD_HANDLER(r10, slb_miss_realmode)
225 mtctr r10
226 bctr
227 #endif
228
229 /* We open code these as we can't have a ". = x" (even with
230 * x = "." within a feature section
231 */
232 . = 0x500;
233 .globl hardware_interrupt_pSeries;
234 .globl hardware_interrupt_hv;
235 hardware_interrupt_pSeries:
236 hardware_interrupt_hv:
237 BEGIN_FTR_SECTION
238 _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
239 EXC_HV, SOFTEN_TEST_HV)
240 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
241 FTR_SECTION_ELSE
242 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
243 EXC_STD, SOFTEN_TEST_PR)
244 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
245 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
246
247 STD_EXCEPTION_PSERIES(0x600, alignment)
248 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x600)
249
250 STD_EXCEPTION_PSERIES(0x700, program_check)
251 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x700)
252
253 STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
254 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x800)
255
256 . = 0x900
257 .globl decrementer_pSeries
258 decrementer_pSeries:
259 _MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR)
260
261 STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
262
263 MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
264 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xa00)
265
266 STD_EXCEPTION_PSERIES(0xb00, trap_0b)
267 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xb00)
268
269 . = 0xc00
270 .globl system_call_pSeries
271 system_call_pSeries:
272 /*
273 * If CONFIG_KVM_BOOK3S_64_HANDLER is set, save the PPR (on systems
274 * that support it) before changing to HMT_MEDIUM. That allows the KVM
275 * code to save that value into the guest state (it is the guest's PPR
276 * value). Otherwise just change to HMT_MEDIUM as userspace has
277 * already saved the PPR.
278 */
279 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
280 SET_SCRATCH0(r13)
281 GET_PACA(r13)
282 std r9,PACA_EXGEN+EX_R9(r13)
283 OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);
284 HMT_MEDIUM;
285 std r10,PACA_EXGEN+EX_R10(r13)
286 OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r9, CPU_FTR_HAS_PPR);
287 mfcr r9
288 KVMTEST(0xc00)
289 GET_SCRATCH0(r13)
290 #else
291 HMT_MEDIUM;
292 #endif
293 SYSCALL_PSERIES_1
294 SYSCALL_PSERIES_2_RFID
295 SYSCALL_PSERIES_3
296 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
297
298 STD_EXCEPTION_PSERIES(0xd00, single_step)
299 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xd00)
300
301 /* At 0xe??? we have a bunch of hypervisor exceptions, we branch
302 * out of line to handle them
303 */
304 . = 0xe00
305 hv_data_storage_trampoline:
306 SET_SCRATCH0(r13)
307 EXCEPTION_PROLOG_0(PACA_EXGEN)
308 b h_data_storage_hv
309
310 . = 0xe20
311 hv_instr_storage_trampoline:
312 SET_SCRATCH0(r13)
313 EXCEPTION_PROLOG_0(PACA_EXGEN)
314 b h_instr_storage_hv
315
316 . = 0xe40
317 emulation_assist_trampoline:
318 SET_SCRATCH0(r13)
319 EXCEPTION_PROLOG_0(PACA_EXGEN)
320 b emulation_assist_hv
321
322 . = 0xe60
323 hv_exception_trampoline:
324 SET_SCRATCH0(r13)
325 EXCEPTION_PROLOG_0(PACA_EXGEN)
326 b hmi_exception_early
327
328 . = 0xe80
329 hv_doorbell_trampoline:
330 SET_SCRATCH0(r13)
331 EXCEPTION_PROLOG_0(PACA_EXGEN)
332 b h_doorbell_hv
333
334 . = 0xea0
335 hv_virt_irq_trampoline:
336 SET_SCRATCH0(r13)
337 EXCEPTION_PROLOG_0(PACA_EXGEN)
338 b h_virt_irq_hv
339
340 /* We need to deal with the Altivec unavailable exception
341 * here which is at 0xf20, thus in the middle of the
342 * prolog code of the PerformanceMonitor one. A little
343 * trickery is thus necessary
344 */
345 . = 0xf00
346 performance_monitor_pseries_trampoline:
347 SET_SCRATCH0(r13)
348 EXCEPTION_PROLOG_0(PACA_EXGEN)
349 b performance_monitor_pSeries
350
351 . = 0xf20
352 altivec_unavailable_pseries_trampoline:
353 SET_SCRATCH0(r13)
354 EXCEPTION_PROLOG_0(PACA_EXGEN)
355 b altivec_unavailable_pSeries
356
357 . = 0xf40
358 vsx_unavailable_pseries_trampoline:
359 SET_SCRATCH0(r13)
360 EXCEPTION_PROLOG_0(PACA_EXGEN)
361 b vsx_unavailable_pSeries
362
363 . = 0xf60
364 facility_unavailable_trampoline:
365 SET_SCRATCH0(r13)
366 EXCEPTION_PROLOG_0(PACA_EXGEN)
367 b facility_unavailable_pSeries
368
369 . = 0xf80
370 hv_facility_unavailable_trampoline:
371 SET_SCRATCH0(r13)
372 EXCEPTION_PROLOG_0(PACA_EXGEN)
373 b facility_unavailable_hv
374
375 #ifdef CONFIG_CBE_RAS
376 STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
377 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
378 #endif /* CONFIG_CBE_RAS */
379
380 STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
381 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
382
383 . = 0x1500
384 .global denorm_exception_hv
385 denorm_exception_hv:
386 mtspr SPRN_SPRG_HSCRATCH0,r13
387 EXCEPTION_PROLOG_0(PACA_EXGEN)
388 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
389
390 #ifdef CONFIG_PPC_DENORMALISATION
391 mfspr r10,SPRN_HSRR1
392 mfspr r11,SPRN_HSRR0 /* save HSRR0 */
393 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
394 addi r11,r11,-4 /* HSRR0 is next instruction */
395 bne+ denorm_assist
396 #endif
397
398 KVMTEST(0x1500)
399 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
400 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500)
401
402 #ifdef CONFIG_CBE_RAS
403 STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
404 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
405 #endif /* CONFIG_CBE_RAS */
406
407 STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
408 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x1700)
409
410 #ifdef CONFIG_CBE_RAS
411 STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
412 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
413 #else
414 . = 0x1800
415 #endif /* CONFIG_CBE_RAS */
416
417
418 /*** Out of line interrupts support ***/
419
420 .align 7
421 /* moved from 0x200 */
422 machine_check_powernv_early:
423 BEGIN_FTR_SECTION
424 EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
425 /*
426 * Register contents:
427 * R13 = PACA
428 * R9 = CR
429 * Original R9 to R13 is saved on PACA_EXMC
430 *
431 * Switch to mc_emergency stack and handle re-entrancy (we limit
432 * the nested MCE upto level 4 to avoid stack overflow).
433 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1
434 *
435 * We use paca->in_mce to check whether this is the first entry or
436 * nested machine check. We increment paca->in_mce to track nested
437 * machine checks.
438 *
439 * If this is the first entry then set stack pointer to
440 * paca->mc_emergency_sp, otherwise r1 is already pointing to
441 * stack frame on mc_emergency stack.
442 *
443 * NOTE: We are here with MSR_ME=0 (off), which means we risk a
444 * checkstop if we get another machine check exception before we do
445 * rfid with MSR_ME=1.
446 */
447 mr r11,r1 /* Save r1 */
448 lhz r10,PACA_IN_MCE(r13)
449 cmpwi r10,0 /* Are we in nested machine check */
450 bne 0f /* Yes, we are. */
451 /* First machine check entry */
452 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
453 0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
454 addi r10,r10,1 /* increment paca->in_mce */
455 sth r10,PACA_IN_MCE(r13)
456 /* Limit nested MCE to level 4 to avoid stack overflow */
457 cmpwi r10,4
458 bgt 2f /* Check if we hit limit of 4 */
459 std r11,GPR1(r1) /* Save r1 on the stack. */
460 std r11,0(r1) /* make stack chain pointer */
461 mfspr r11,SPRN_SRR0 /* Save SRR0 */
462 std r11,_NIP(r1)
463 mfspr r11,SPRN_SRR1 /* Save SRR1 */
464 std r11,_MSR(r1)
465 mfspr r11,SPRN_DAR /* Save DAR */
466 std r11,_DAR(r1)
467 mfspr r11,SPRN_DSISR /* Save DSISR */
468 std r11,_DSISR(r1)
469 std r9,_CCR(r1) /* Save CR in stackframe */
470 /* Save r9 through r13 from EXMC save area to stack frame. */
471 EXCEPTION_PROLOG_COMMON_2(PACA_EXMC)
472 mfmsr r11 /* get MSR value */
473 ori r11,r11,MSR_ME /* turn on ME bit */
474 ori r11,r11,MSR_RI /* turn on RI bit */
475 ld r12,PACAKBASE(r13) /* get high part of &label */
476 LOAD_HANDLER(r12, machine_check_handle_early)
477 1: mtspr SPRN_SRR0,r12
478 mtspr SPRN_SRR1,r11
479 rfid
480 b . /* prevent speculative execution */
481 2:
482 /* Stack overflow. Stay on emergency stack and panic.
483 * Keep the ME bit off while panic-ing, so that if we hit
484 * another machine check we checkstop.
485 */
486 addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */
487 ld r11,PACAKMSR(r13)
488 ld r12,PACAKBASE(r13)
489 LOAD_HANDLER(r12, unrecover_mce)
490 li r10,MSR_ME
491 andc r11,r11,r10 /* Turn off MSR_ME */
492 b 1b
493 b . /* prevent speculative execution */
494 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
495
496 machine_check_pSeries:
497 .globl machine_check_fwnmi
498 machine_check_fwnmi:
499 SET_SCRATCH0(r13) /* save r13 */
500 EXCEPTION_PROLOG_0(PACA_EXMC)
501 machine_check_pSeries_0:
502 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200)
503 EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD)
504 KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
505 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
506 KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
507 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x400)
508 KVM_HANDLER(PACA_EXSLB, EXC_STD, 0x480)
509 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x900)
510 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
511
512 #ifdef CONFIG_PPC_DENORMALISATION
513 denorm_assist:
514 BEGIN_FTR_SECTION
515 /*
516 * To denormalise we need to move a copy of the register to itself.
517 * For POWER6 do that here for all FP regs.
518 */
519 mfmsr r10
520 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
521 xori r10,r10,(MSR_FE0|MSR_FE1)
522 mtmsrd r10
523 sync
524
525 #define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
526 #define FMR4(n) FMR2(n) ; FMR2(n+2)
527 #define FMR8(n) FMR4(n) ; FMR4(n+4)
528 #define FMR16(n) FMR8(n) ; FMR8(n+8)
529 #define FMR32(n) FMR16(n) ; FMR16(n+16)
530 FMR32(0)
531
532 FTR_SECTION_ELSE
533 /*
534 * To denormalise we need to move a copy of the register to itself.
535 * For POWER7 do that here for the first 32 VSX registers only.
536 */
537 mfmsr r10
538 oris r10,r10,MSR_VSX@h
539 mtmsrd r10
540 sync
541
542 #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
543 #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
544 #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
545 #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
546 #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
547 XVCPSGNDP32(0)
548
549 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
550
551 BEGIN_FTR_SECTION
552 b denorm_done
553 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
554 /*
555 * To denormalise we need to move a copy of the register to itself.
556 * For POWER8 we need to do that for all 64 VSX registers
557 */
558 XVCPSGNDP32(32)
559 denorm_done:
560 mtspr SPRN_HSRR0,r11
561 mtcrf 0x80,r9
562 ld r9,PACA_EXGEN+EX_R9(r13)
563 RESTORE_PPR_PACA(PACA_EXGEN, r10)
564 BEGIN_FTR_SECTION
565 ld r10,PACA_EXGEN+EX_CFAR(r13)
566 mtspr SPRN_CFAR,r10
567 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
568 ld r10,PACA_EXGEN+EX_R10(r13)
569 ld r11,PACA_EXGEN+EX_R11(r13)
570 ld r12,PACA_EXGEN+EX_R12(r13)
571 ld r13,PACA_EXGEN+EX_R13(r13)
572 HRFID
573 b .
574 #endif
575
576 .align 7
577 /* moved from 0xe00 */
578 STD_EXCEPTION_HV_OOL(0xe02, h_data_storage)
579 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
580 STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage)
581 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
582 STD_EXCEPTION_HV_OOL(0xe42, emulation_assist)
583 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
584 MASKABLE_EXCEPTION_HV_OOL(0xe62, hmi_exception)
585 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
586
587 MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell)
588 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
589
590 MASKABLE_EXCEPTION_HV_OOL(0xea2, h_virt_irq)
591 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xea2)
592
593 /* moved from 0xf00 */
594 STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
595 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf00)
596 STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
597 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf20)
598 STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
599 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf40)
600 STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
601 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf60)
602 STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable)
603 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82)
604
605 /*
606 * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
607 * - If it was a decrementer interrupt, we bump the dec to max and and return.
608 * - If it was a doorbell we return immediately since doorbells are edge
609 * triggered and won't automatically refire.
610 * - If it was a HMI we return immediately since we handled it in realmode
611 * and it won't refire.
612 * - else we hard disable and return.
613 * This is called with r10 containing the value to OR to the paca field.
614 */
615 #define MASKED_INTERRUPT(_H) \
616 masked_##_H##interrupt: \
617 std r11,PACA_EXGEN+EX_R11(r13); \
618 lbz r11,PACAIRQHAPPENED(r13); \
619 or r11,r11,r10; \
620 stb r11,PACAIRQHAPPENED(r13); \
621 cmpwi r10,PACA_IRQ_DEC; \
622 bne 1f; \
623 lis r10,0x7fff; \
624 ori r10,r10,0xffff; \
625 mtspr SPRN_DEC,r10; \
626 b 2f; \
627 1: cmpwi r10,PACA_IRQ_DBELL; \
628 beq 2f; \
629 cmpwi r10,PACA_IRQ_HMI; \
630 beq 2f; \
631 mfspr r10,SPRN_##_H##SRR1; \
632 rldicl r10,r10,48,1; /* clear MSR_EE */ \
633 rotldi r10,r10,16; \
634 mtspr SPRN_##_H##SRR1,r10; \
635 2: mtcrf 0x80,r9; \
636 ld r9,PACA_EXGEN+EX_R9(r13); \
637 ld r10,PACA_EXGEN+EX_R10(r13); \
638 ld r11,PACA_EXGEN+EX_R11(r13); \
639 GET_SCRATCH0(r13); \
640 ##_H##rfid; \
641 b .
642
643 MASKED_INTERRUPT()
644 MASKED_INTERRUPT(H)
645
646 /*
647 * Called from arch_local_irq_enable when an interrupt needs
648 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
649 * which kind of interrupt. MSR:EE is already off. We generate a
650 * stackframe like if a real interrupt had happened.
651 *
652 * Note: While MSR:EE is off, we need to make sure that _MSR
653 * in the generated frame has EE set to 1 or the exception
654 * handler will not properly re-enable them.
655 */
656 _GLOBAL(__replay_interrupt)
657 /* We are going to jump to the exception common code which
658 * will retrieve various register values from the PACA which
659 * we don't give a damn about, so we don't bother storing them.
660 */
661 mfmsr r12
662 mflr r11
663 mfcr r9
664 ori r12,r12,MSR_EE
665 cmpwi r3,0x900
666 beq decrementer_common
667 cmpwi r3,0x500
668 beq hardware_interrupt_common
669 BEGIN_FTR_SECTION
670 cmpwi r3,0xe80
671 beq h_doorbell_common
672 cmpwi r3,0xea0
673 beq h_virt_irq_common
674 FTR_SECTION_ELSE
675 cmpwi r3,0xa00
676 beq doorbell_super_common
677 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
678 blr
679
680 #ifdef CONFIG_PPC_PSERIES
681 /*
682 * Vectors for the FWNMI option. Share common code.
683 */
684 .globl system_reset_fwnmi
685 .align 7
686 system_reset_fwnmi:
687 SET_SCRATCH0(r13) /* save r13 */
688 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
689 NOTEST, 0x100)
690
691 #endif /* CONFIG_PPC_PSERIES */
692
693 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
694 kvmppc_skip_interrupt:
695 /*
696 * Here all GPRs are unchanged from when the interrupt happened
697 * except for r13, which is saved in SPRG_SCRATCH0.
698 */
699 mfspr r13, SPRN_SRR0
700 addi r13, r13, 4
701 mtspr SPRN_SRR0, r13
702 GET_SCRATCH0(r13)
703 rfid
704 b .
705
706 kvmppc_skip_Hinterrupt:
707 /*
708 * Here all GPRs are unchanged from when the interrupt happened
709 * except for r13, which is saved in SPRG_SCRATCH0.
710 */
711 mfspr r13, SPRN_HSRR0
712 addi r13, r13, 4
713 mtspr SPRN_HSRR0, r13
714 GET_SCRATCH0(r13)
715 hrfid
716 b .
717 #endif
718
719 /*
720 * Ensure that any handlers that get invoked from the exception prologs
721 * above are below the first 64KB (0x10000) of the kernel image because
722 * the prologs assemble the addresses of these handlers using the
723 * LOAD_HANDLER macro, which uses an ori instruction.
724 */
725
726 /*** Common interrupt handlers ***/
727
728 STD_EXCEPTION_COMMON(0x100, system_reset, system_reset_exception)
729
730 STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
731 STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, timer_interrupt)
732 STD_EXCEPTION_COMMON(0x980, hdecrementer, hdec_interrupt)
733 #ifdef CONFIG_PPC_DOORBELL
734 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, doorbell_exception)
735 #else
736 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, unknown_exception)
737 #endif
738 STD_EXCEPTION_COMMON(0xb00, trap_0b, unknown_exception)
739 STD_EXCEPTION_COMMON(0xd00, single_step, single_step_exception)
740 STD_EXCEPTION_COMMON(0xe00, trap_0e, unknown_exception)
741 STD_EXCEPTION_COMMON(0xe40, emulation_assist, emulation_assist_interrupt)
742 STD_EXCEPTION_COMMON_ASYNC(0xe60, hmi_exception, handle_hmi_exception)
743 #ifdef CONFIG_PPC_DOORBELL
744 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, doorbell_exception)
745 #else
746 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, unknown_exception)
747 #endif
748 STD_EXCEPTION_COMMON_ASYNC(0xea0, h_virt_irq, do_IRQ)
749 STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, performance_monitor_exception)
750 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, instruction_breakpoint_exception)
751 STD_EXCEPTION_COMMON(0x1502, denorm, unknown_exception)
752 #ifdef CONFIG_ALTIVEC
753 STD_EXCEPTION_COMMON(0x1700, altivec_assist, altivec_assist_exception)
754 #else
755 STD_EXCEPTION_COMMON(0x1700, altivec_assist, unknown_exception)
756 #endif
757
758 /*
759 * Relocation-on interrupts: A subset of the interrupts can be delivered
760 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
761 * it. Addresses are the same as the original interrupt addresses, but
762 * offset by 0xc000000000004000.
763 * It's impossible to receive interrupts below 0x300 via this mechanism.
764 * KVM: None of these traps are from the guest ; anything that escalated
765 * to HV=1 from HV=0 is delivered via real mode handlers.
766 */
767
768 /*
769 * This uses the standard macro, since the original 0x300 vector
770 * only has extra guff for STAB-based processors -- which never
771 * come here.
772 */
773 STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access)
774 . = 0x4380
775 .globl data_access_slb_relon_pSeries
776 data_access_slb_relon_pSeries:
777 SET_SCRATCH0(r13)
778 EXCEPTION_PROLOG_0(PACA_EXSLB)
779 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
780 std r3,PACA_EXSLB+EX_R3(r13)
781 mfspr r3,SPRN_DAR
782 mfspr r12,SPRN_SRR1
783 #ifndef CONFIG_RELOCATABLE
784 b slb_miss_realmode
785 #else
786 /*
787 * We can't just use a direct branch to slb_miss_realmode
788 * because the distance from here to there depends on where
789 * the kernel ends up being put.
790 */
791 mfctr r11
792 ld r10,PACAKBASE(r13)
793 LOAD_HANDLER(r10, slb_miss_realmode)
794 mtctr r10
795 bctr
796 #endif
797
798 STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access)
799 . = 0x4480
800 .globl instruction_access_slb_relon_pSeries
801 instruction_access_slb_relon_pSeries:
802 SET_SCRATCH0(r13)
803 EXCEPTION_PROLOG_0(PACA_EXSLB)
804 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
805 std r3,PACA_EXSLB+EX_R3(r13)
806 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
807 mfspr r12,SPRN_SRR1
808 #ifndef CONFIG_RELOCATABLE
809 b slb_miss_realmode
810 #else
811 mfctr r11
812 ld r10,PACAKBASE(r13)
813 LOAD_HANDLER(r10, slb_miss_realmode)
814 mtctr r10
815 bctr
816 #endif
817
818 . = 0x4500
819 .globl hardware_interrupt_relon_pSeries;
820 .globl hardware_interrupt_relon_hv;
821 hardware_interrupt_relon_pSeries:
822 hardware_interrupt_relon_hv:
823 BEGIN_FTR_SECTION
824 _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
825 FTR_SECTION_ELSE
826 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
827 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
828 STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
829 STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
830 STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
831 MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
832 STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
833 MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
834 STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
835
836 . = 0x4c00
837 .globl system_call_relon_pSeries
838 system_call_relon_pSeries:
839 HMT_MEDIUM
840 SYSCALL_PSERIES_1
841 SYSCALL_PSERIES_2_DIRECT
842 SYSCALL_PSERIES_3
843
844 STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step)
845
846 . = 0x4e00
847 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
848
849 . = 0x4e20
850 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
851
852 . = 0x4e40
853 emulation_assist_relon_trampoline:
854 SET_SCRATCH0(r13)
855 EXCEPTION_PROLOG_0(PACA_EXGEN)
856 b emulation_assist_relon_hv
857
858 . = 0x4e60
859 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
860
861 . = 0x4e80
862 h_doorbell_relon_trampoline:
863 SET_SCRATCH0(r13)
864 EXCEPTION_PROLOG_0(PACA_EXGEN)
865 b h_doorbell_relon_hv
866
867 . = 0x4ea0
868 h_virt_irq_relon_trampoline:
869 SET_SCRATCH0(r13)
870 EXCEPTION_PROLOG_0(PACA_EXGEN)
871 b h_virt_irq_relon_hv
872
873 . = 0x4f00
874 performance_monitor_relon_pseries_trampoline:
875 SET_SCRATCH0(r13)
876 EXCEPTION_PROLOG_0(PACA_EXGEN)
877 b performance_monitor_relon_pSeries
878
879 . = 0x4f20
880 altivec_unavailable_relon_pseries_trampoline:
881 SET_SCRATCH0(r13)
882 EXCEPTION_PROLOG_0(PACA_EXGEN)
883 b altivec_unavailable_relon_pSeries
884
885 . = 0x4f40
886 vsx_unavailable_relon_pseries_trampoline:
887 SET_SCRATCH0(r13)
888 EXCEPTION_PROLOG_0(PACA_EXGEN)
889 b vsx_unavailable_relon_pSeries
890
891 . = 0x4f60
892 facility_unavailable_relon_trampoline:
893 SET_SCRATCH0(r13)
894 EXCEPTION_PROLOG_0(PACA_EXGEN)
895 b facility_unavailable_relon_pSeries
896
897 . = 0x4f80
898 hv_facility_unavailable_relon_trampoline:
899 SET_SCRATCH0(r13)
900 EXCEPTION_PROLOG_0(PACA_EXGEN)
901 b hv_facility_unavailable_relon_hv
902
903 STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
904 #ifdef CONFIG_PPC_DENORMALISATION
905 . = 0x5500
906 b denorm_exception_hv
907 #endif
908 STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist)
909
910 .align 7
911 system_call_entry:
912 b system_call_common
913
914 ppc64_runlatch_on_trampoline:
915 b __ppc64_runlatch_on
916
917 /*
918 * Here r13 points to the paca, r9 contains the saved CR,
919 * SRR0 and SRR1 are saved in r11 and r12,
920 * r9 - r13 are saved in paca->exgen.
921 */
922 .align 7
923 .globl data_access_common
924 data_access_common:
925 mfspr r10,SPRN_DAR
926 std r10,PACA_EXGEN+EX_DAR(r13)
927 mfspr r10,SPRN_DSISR
928 stw r10,PACA_EXGEN+EX_DSISR(r13)
929 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
930 RECONCILE_IRQ_STATE(r10, r11)
931 ld r12,_MSR(r1)
932 ld r3,PACA_EXGEN+EX_DAR(r13)
933 lwz r4,PACA_EXGEN+EX_DSISR(r13)
934 li r5,0x300
935 std r3,_DAR(r1)
936 std r4,_DSISR(r1)
937 BEGIN_MMU_FTR_SECTION
938 b do_hash_page /* Try to handle as hpte fault */
939 MMU_FTR_SECTION_ELSE
940 b handle_page_fault
941 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_RADIX)
942
943 .align 7
944 .globl h_data_storage_common
945 h_data_storage_common:
946 mfspr r10,SPRN_HDAR
947 std r10,PACA_EXGEN+EX_DAR(r13)
948 mfspr r10,SPRN_HDSISR
949 stw r10,PACA_EXGEN+EX_DSISR(r13)
950 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
951 bl save_nvgprs
952 RECONCILE_IRQ_STATE(r10, r11)
953 addi r3,r1,STACK_FRAME_OVERHEAD
954 bl unknown_exception
955 b ret_from_except
956
957 .align 7
958 .globl instruction_access_common
959 instruction_access_common:
960 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
961 RECONCILE_IRQ_STATE(r10, r11)
962 ld r12,_MSR(r1)
963 ld r3,_NIP(r1)
964 andis. r4,r12,0x5820
965 li r5,0x400
966 std r3,_DAR(r1)
967 std r4,_DSISR(r1)
968 BEGIN_MMU_FTR_SECTION
969 b do_hash_page /* Try to handle as hpte fault */
970 MMU_FTR_SECTION_ELSE
971 b handle_page_fault
972 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_RADIX)
973
974 STD_EXCEPTION_COMMON(0xe20, h_instr_storage, unknown_exception)
975
976 /*
977 * Machine check is different because we use a different
978 * save area: PACA_EXMC instead of PACA_EXGEN.
979 */
980 .align 7
981 .globl machine_check_common
982 machine_check_common:
983
984 mfspr r10,SPRN_DAR
985 std r10,PACA_EXGEN+EX_DAR(r13)
986 mfspr r10,SPRN_DSISR
987 stw r10,PACA_EXGEN+EX_DSISR(r13)
988 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
989 FINISH_NAP
990 RECONCILE_IRQ_STATE(r10, r11)
991 ld r3,PACA_EXGEN+EX_DAR(r13)
992 lwz r4,PACA_EXGEN+EX_DSISR(r13)
993 std r3,_DAR(r1)
994 std r4,_DSISR(r1)
995 bl save_nvgprs
996 addi r3,r1,STACK_FRAME_OVERHEAD
997 bl machine_check_exception
998 b ret_from_except
999
1000 .align 7
1001 .globl alignment_common
1002 alignment_common:
1003 mfspr r10,SPRN_DAR
1004 std r10,PACA_EXGEN+EX_DAR(r13)
1005 mfspr r10,SPRN_DSISR
1006 stw r10,PACA_EXGEN+EX_DSISR(r13)
1007 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1008 ld r3,PACA_EXGEN+EX_DAR(r13)
1009 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1010 std r3,_DAR(r1)
1011 std r4,_DSISR(r1)
1012 bl save_nvgprs
1013 RECONCILE_IRQ_STATE(r10, r11)
1014 addi r3,r1,STACK_FRAME_OVERHEAD
1015 bl alignment_exception
1016 b ret_from_except
1017
1018 .align 7
1019 .globl program_check_common
1020 program_check_common:
1021 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1022 bl save_nvgprs
1023 RECONCILE_IRQ_STATE(r10, r11)
1024 addi r3,r1,STACK_FRAME_OVERHEAD
1025 bl program_check_exception
1026 b ret_from_except
1027
1028 .align 7
1029 .globl fp_unavailable_common
1030 fp_unavailable_common:
1031 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1032 bne 1f /* if from user, just load it up */
1033 bl save_nvgprs
1034 RECONCILE_IRQ_STATE(r10, r11)
1035 addi r3,r1,STACK_FRAME_OVERHEAD
1036 bl kernel_fp_unavailable_exception
1037 BUG_OPCODE
1038 1:
1039 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1040 BEGIN_FTR_SECTION
1041 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1042 * transaction), go do TM stuff
1043 */
1044 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1045 bne- 2f
1046 END_FTR_SECTION_IFSET(CPU_FTR_TM)
1047 #endif
1048 bl load_up_fpu
1049 b fast_exception_return
1050 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1051 2: /* User process was in a transaction */
1052 bl save_nvgprs
1053 RECONCILE_IRQ_STATE(r10, r11)
1054 addi r3,r1,STACK_FRAME_OVERHEAD
1055 bl fp_unavailable_tm
1056 b ret_from_except
1057 #endif
1058 .align 7
1059 .globl altivec_unavailable_common
1060 altivec_unavailable_common:
1061 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1062 #ifdef CONFIG_ALTIVEC
1063 BEGIN_FTR_SECTION
1064 beq 1f
1065 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1066 BEGIN_FTR_SECTION_NESTED(69)
1067 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1068 * transaction), go do TM stuff
1069 */
1070 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1071 bne- 2f
1072 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1073 #endif
1074 bl load_up_altivec
1075 b fast_exception_return
1076 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1077 2: /* User process was in a transaction */
1078 bl save_nvgprs
1079 RECONCILE_IRQ_STATE(r10, r11)
1080 addi r3,r1,STACK_FRAME_OVERHEAD
1081 bl altivec_unavailable_tm
1082 b ret_from_except
1083 #endif
1084 1:
1085 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1086 #endif
1087 bl save_nvgprs
1088 RECONCILE_IRQ_STATE(r10, r11)
1089 addi r3,r1,STACK_FRAME_OVERHEAD
1090 bl altivec_unavailable_exception
1091 b ret_from_except
1092
1093 .align 7
1094 .globl vsx_unavailable_common
1095 vsx_unavailable_common:
1096 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
1097 #ifdef CONFIG_VSX
1098 BEGIN_FTR_SECTION
1099 beq 1f
1100 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1101 BEGIN_FTR_SECTION_NESTED(69)
1102 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1103 * transaction), go do TM stuff
1104 */
1105 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1106 bne- 2f
1107 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1108 #endif
1109 b load_up_vsx
1110 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1111 2: /* User process was in a transaction */
1112 bl save_nvgprs
1113 RECONCILE_IRQ_STATE(r10, r11)
1114 addi r3,r1,STACK_FRAME_OVERHEAD
1115 bl vsx_unavailable_tm
1116 b ret_from_except
1117 #endif
1118 1:
1119 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
1120 #endif
1121 bl save_nvgprs
1122 RECONCILE_IRQ_STATE(r10, r11)
1123 addi r3,r1,STACK_FRAME_OVERHEAD
1124 bl vsx_unavailable_exception
1125 b ret_from_except
1126
1127 /* Equivalents to the above handlers for relocation-on interrupt vectors */
1128 STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
1129 MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell)
1130 MASKABLE_RELON_EXCEPTION_HV_OOL(0xea0, h_virt_irq)
1131
1132 STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
1133 STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
1134 STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
1135 STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
1136 STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_unavailable)
1137
1138 /*
1139 * The __end_interrupts marker must be past the out-of-line (OOL)
1140 * handlers, so that they are copied to real address 0x100 when running
1141 * a relocatable kernel. This ensures they can be reached from the short
1142 * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch
1143 * directly, without using LOAD_HANDLER().
1144 */
1145 .align 7
1146 .globl __end_interrupts
1147 __end_interrupts:
1148
1149 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
1150 /*
1151 * Data area reserved for FWNMI option.
1152 * This address (0x7000) is fixed by the RPA.
1153 */
1154 .= 0x7000
1155 .globl fwnmi_data_area
1156 fwnmi_data_area:
1157
1158 /* pseries and powernv need to keep the whole page from
1159 * 0x7000 to 0x8000 free for use by the firmware
1160 */
1161 . = 0x8000
1162 #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1163
1164 STD_EXCEPTION_COMMON(0xf60, facility_unavailable, facility_unavailable_exception)
1165 STD_EXCEPTION_COMMON(0xf80, hv_facility_unavailable, facility_unavailable_exception)
1166
1167 #ifdef CONFIG_CBE_RAS
1168 STD_EXCEPTION_COMMON(0x1200, cbe_system_error, cbe_system_error_exception)
1169 STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, cbe_maintenance_exception)
1170 STD_EXCEPTION_COMMON(0x1800, cbe_thermal, cbe_thermal_exception)
1171 #endif /* CONFIG_CBE_RAS */
1172
1173 .globl hmi_exception_early
1174 hmi_exception_early:
1175 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0xe60)
1176 mr r10,r1 /* Save r1 */
1177 ld r1,PACAEMERGSP(r13) /* Use emergency stack */
1178 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
1179 std r9,_CCR(r1) /* save CR in stackframe */
1180 mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
1181 std r11,_NIP(r1) /* save HSRR0 in stackframe */
1182 mfspr r12,SPRN_HSRR1 /* Save SRR1 */
1183 std r12,_MSR(r1) /* save SRR1 in stackframe */
1184 std r10,0(r1) /* make stack chain pointer */
1185 std r0,GPR0(r1) /* save r0 in stackframe */
1186 std r10,GPR1(r1) /* save r1 in stackframe */
1187 EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
1188 EXCEPTION_PROLOG_COMMON_3(0xe60)
1189 addi r3,r1,STACK_FRAME_OVERHEAD
1190 bl hmi_exception_realmode
1191 /* Windup the stack. */
1192 /* Move original HSRR0 and HSRR1 into the respective regs */
1193 ld r9,_MSR(r1)
1194 mtspr SPRN_HSRR1,r9
1195 ld r3,_NIP(r1)
1196 mtspr SPRN_HSRR0,r3
1197 ld r9,_CTR(r1)
1198 mtctr r9
1199 ld r9,_XER(r1)
1200 mtxer r9
1201 ld r9,_LINK(r1)
1202 mtlr r9
1203 REST_GPR(0, r1)
1204 REST_8GPRS(2, r1)
1205 REST_GPR(10, r1)
1206 ld r11,_CCR(r1)
1207 mtcr r11
1208 REST_GPR(11, r1)
1209 REST_2GPRS(12, r1)
1210 /* restore original r1. */
1211 ld r1,GPR1(r1)
1212
1213 /*
1214 * Go to virtual mode and pull the HMI event information from
1215 * firmware.
1216 */
1217 .globl hmi_exception_after_realmode
1218 hmi_exception_after_realmode:
1219 SET_SCRATCH0(r13)
1220 EXCEPTION_PROLOG_0(PACA_EXGEN)
1221 b hmi_exception_hv
1222
1223
1224 #define MACHINE_CHECK_HANDLER_WINDUP \
1225 /* Clear MSR_RI before setting SRR0 and SRR1. */\
1226 li r0,MSR_RI; \
1227 mfmsr r9; /* get MSR value */ \
1228 andc r9,r9,r0; \
1229 mtmsrd r9,1; /* Clear MSR_RI */ \
1230 /* Move original SRR0 and SRR1 into the respective regs */ \
1231 ld r9,_MSR(r1); \
1232 mtspr SPRN_SRR1,r9; \
1233 ld r3,_NIP(r1); \
1234 mtspr SPRN_SRR0,r3; \
1235 ld r9,_CTR(r1); \
1236 mtctr r9; \
1237 ld r9,_XER(r1); \
1238 mtxer r9; \
1239 ld r9,_LINK(r1); \
1240 mtlr r9; \
1241 REST_GPR(0, r1); \
1242 REST_8GPRS(2, r1); \
1243 REST_GPR(10, r1); \
1244 ld r11,_CCR(r1); \
1245 mtcr r11; \
1246 /* Decrement paca->in_mce. */ \
1247 lhz r12,PACA_IN_MCE(r13); \
1248 subi r12,r12,1; \
1249 sth r12,PACA_IN_MCE(r13); \
1250 REST_GPR(11, r1); \
1251 REST_2GPRS(12, r1); \
1252 /* restore original r1. */ \
1253 ld r1,GPR1(r1)
1254
1255 /*
1256 * Handle machine check early in real mode. We come here with
1257 * ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack.
1258 */
1259 .align 7
1260 .globl machine_check_handle_early
1261 machine_check_handle_early:
1262 std r0,GPR0(r1) /* Save r0 */
1263 EXCEPTION_PROLOG_COMMON_3(0x200)
1264 bl save_nvgprs
1265 addi r3,r1,STACK_FRAME_OVERHEAD
1266 bl machine_check_early
1267 std r3,RESULT(r1) /* Save result */
1268 ld r12,_MSR(r1)
1269 #ifdef CONFIG_PPC_P7_NAP
1270 /*
1271 * Check if thread was in power saving mode. We come here when any
1272 * of the following is true:
1273 * a. thread wasn't in power saving mode
1274 * b. thread was in power saving mode with no state loss or
1275 * supervisor state loss
1276 *
1277 * Go back to nap again if (b) is true.
1278 */
1279 rlwinm. r11,r12,47-31,30,31 /* Was it in power saving mode? */
1280 beq 4f /* No, it wasn;t */
1281 /* Thread was in power saving mode. Go back to nap again. */
1282 cmpwi r11,2
1283 bne 3f
1284 /* Supervisor state loss */
1285 li r0,1
1286 stb r0,PACA_NAPSTATELOST(r13)
1287 3: bl machine_check_queue_event
1288 MACHINE_CHECK_HANDLER_WINDUP
1289 GET_PACA(r13)
1290 ld r1,PACAR1(r13)
1291 li r3,PNV_THREAD_NAP
1292 b pnv_enter_arch207_idle_mode
1293 4:
1294 #endif
1295 /*
1296 * Check if we are coming from hypervisor userspace. If yes then we
1297 * continue in host kernel in V mode to deliver the MC event.
1298 */
1299 rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */
1300 beq 5f
1301 andi. r11,r12,MSR_PR /* See if coming from user. */
1302 bne 9f /* continue in V mode if we are. */
1303
1304 5:
1305 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
1306 /*
1307 * We are coming from kernel context. Check if we are coming from
1308 * guest. if yes, then we can continue. We will fall through
1309 * do_kvm_200->kvmppc_interrupt to deliver the MC event to guest.
1310 */
1311 lbz r11,HSTATE_IN_GUEST(r13)
1312 cmpwi r11,0 /* Check if coming from guest */
1313 bne 9f /* continue if we are. */
1314 #endif
1315 /*
1316 * At this point we are not sure about what context we come from.
1317 * Queue up the MCE event and return from the interrupt.
1318 * But before that, check if this is an un-recoverable exception.
1319 * If yes, then stay on emergency stack and panic.
1320 */
1321 andi. r11,r12,MSR_RI
1322 bne 2f
1323 1: mfspr r11,SPRN_SRR0
1324 ld r10,PACAKBASE(r13)
1325 LOAD_HANDLER(r10,unrecover_mce)
1326 mtspr SPRN_SRR0,r10
1327 ld r10,PACAKMSR(r13)
1328 /*
1329 * We are going down. But there are chances that we might get hit by
1330 * another MCE during panic path and we may run into unstable state
1331 * with no way out. Hence, turn ME bit off while going down, so that
1332 * when another MCE is hit during panic path, system will checkstop
1333 * and hypervisor will get restarted cleanly by SP.
1334 */
1335 li r3,MSR_ME
1336 andc r10,r10,r3 /* Turn off MSR_ME */
1337 mtspr SPRN_SRR1,r10
1338 rfid
1339 b .
1340 2:
1341 /*
1342 * Check if we have successfully handled/recovered from error, if not
1343 * then stay on emergency stack and panic.
1344 */
1345 ld r3,RESULT(r1) /* Load result */
1346 cmpdi r3,0 /* see if we handled MCE successfully */
1347
1348 beq 1b /* if !handled then panic */
1349 /*
1350 * Return from MC interrupt.
1351 * Queue up the MCE event so that we can log it later, while
1352 * returning from kernel or opal call.
1353 */
1354 bl machine_check_queue_event
1355 MACHINE_CHECK_HANDLER_WINDUP
1356 rfid
1357 9:
1358 /* Deliver the machine check to host kernel in V mode. */
1359 MACHINE_CHECK_HANDLER_WINDUP
1360 b machine_check_pSeries
1361
1362 unrecover_mce:
1363 /* Invoke machine_check_exception to print MCE event and panic. */
1364 addi r3,r1,STACK_FRAME_OVERHEAD
1365 bl machine_check_exception
1366 /*
1367 * We will not reach here. Even if we did, there is no way out. Call
1368 * unrecoverable_exception and die.
1369 */
1370 1: addi r3,r1,STACK_FRAME_OVERHEAD
1371 bl unrecoverable_exception
1372 b 1b
1373 /*
1374 * r13 points to the PACA, r9 contains the saved CR,
1375 * r12 contain the saved SRR1, SRR0 is still ready for return
1376 * r3 has the faulting address
1377 * r9 - r13 are saved in paca->exslb.
1378 * r3 is saved in paca->slb_r3
1379 * We assume we aren't going to take any exceptions during this procedure.
1380 */
1381 slb_miss_realmode:
1382 mflr r10
1383 #ifdef CONFIG_RELOCATABLE
1384 mtctr r11
1385 #endif
1386
1387 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1388 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
1389
1390 #ifdef CONFIG_PPC_STD_MMU_64
1391 BEGIN_MMU_FTR_SECTION
1392 bl slb_allocate_realmode
1393 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_RADIX)
1394 #endif
1395 /* All done -- return from exception. */
1396
1397 ld r10,PACA_EXSLB+EX_LR(r13)
1398 ld r3,PACA_EXSLB+EX_R3(r13)
1399 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1400
1401 mtlr r10
1402 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1403 BEGIN_MMU_FTR_SECTION
1404 beq- 2f
1405 FTR_SECTION_ELSE
1406 b 2f
1407 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_RADIX)
1408
1409 .machine push
1410 .machine "power4"
1411 mtcrf 0x80,r9
1412 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
1413 .machine pop
1414
1415 RESTORE_PPR_PACA(PACA_EXSLB, r9)
1416 ld r9,PACA_EXSLB+EX_R9(r13)
1417 ld r10,PACA_EXSLB+EX_R10(r13)
1418 ld r11,PACA_EXSLB+EX_R11(r13)
1419 ld r12,PACA_EXSLB+EX_R12(r13)
1420 ld r13,PACA_EXSLB+EX_R13(r13)
1421 rfid
1422 b . /* prevent speculative execution */
1423
1424 2: mfspr r11,SPRN_SRR0
1425 ld r10,PACAKBASE(r13)
1426 LOAD_HANDLER(r10,unrecov_slb)
1427 mtspr SPRN_SRR0,r10
1428 ld r10,PACAKMSR(r13)
1429 mtspr SPRN_SRR1,r10
1430 rfid
1431 b .
1432
1433 unrecov_slb:
1434 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1435 RECONCILE_IRQ_STATE(r10, r11)
1436 bl save_nvgprs
1437 1: addi r3,r1,STACK_FRAME_OVERHEAD
1438 bl unrecoverable_exception
1439 b 1b
1440
1441
1442 #ifdef CONFIG_PPC_970_NAP
1443 power4_fixup_nap:
1444 andc r9,r9,r10
1445 std r9,TI_LOCAL_FLAGS(r11)
1446 ld r10,_LINK(r1) /* make idle task do the */
1447 std r10,_NIP(r1) /* equivalent of a blr */
1448 blr
1449 #endif
1450
1451 /*
1452 * Hash table stuff
1453 */
1454 .align 7
1455 do_hash_page:
1456 #ifdef CONFIG_PPC_STD_MMU_64
1457 andis. r0,r4,0xa410 /* weird error? */
1458 bne- handle_page_fault /* if not, try to insert a HPTE */
1459 andis. r0,r4,DSISR_DABRMATCH@h
1460 bne- handle_dabr_fault
1461 CURRENT_THREAD_INFO(r11, r1)
1462 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
1463 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
1464 bne 77f /* then don't call hash_page now */
1465
1466 /*
1467 * r3 contains the faulting address
1468 * r4 msr
1469 * r5 contains the trap number
1470 * r6 contains dsisr
1471 *
1472 * at return r3 = 0 for success, 1 for page fault, negative for error
1473 */
1474 mr r4,r12
1475 ld r6,_DSISR(r1)
1476 bl __hash_page /* build HPTE if possible */
1477 cmpdi r3,0 /* see if __hash_page succeeded */
1478
1479 /* Success */
1480 beq fast_exc_return_irq /* Return from exception on success */
1481
1482 /* Error */
1483 blt- 13f
1484 #endif /* CONFIG_PPC_STD_MMU_64 */
1485
1486 /* Here we have a page fault that hash_page can't handle. */
1487 handle_page_fault:
1488 11: ld r4,_DAR(r1)
1489 ld r5,_DSISR(r1)
1490 addi r3,r1,STACK_FRAME_OVERHEAD
1491 bl do_page_fault
1492 cmpdi r3,0
1493 beq+ 12f
1494 bl save_nvgprs
1495 mr r5,r3
1496 addi r3,r1,STACK_FRAME_OVERHEAD
1497 lwz r4,_DAR(r1)
1498 bl bad_page_fault
1499 b ret_from_except
1500
1501 /* We have a data breakpoint exception - handle it */
1502 handle_dabr_fault:
1503 bl save_nvgprs
1504 ld r4,_DAR(r1)
1505 ld r5,_DSISR(r1)
1506 addi r3,r1,STACK_FRAME_OVERHEAD
1507 bl do_break
1508 12: b ret_from_except_lite
1509
1510
1511 #ifdef CONFIG_PPC_STD_MMU_64
1512 /* We have a page fault that hash_page could handle but HV refused
1513 * the PTE insertion
1514 */
1515 13: bl save_nvgprs
1516 mr r5,r3
1517 addi r3,r1,STACK_FRAME_OVERHEAD
1518 ld r4,_DAR(r1)
1519 bl low_hash_fault
1520 b ret_from_except
1521 #endif
1522
1523 /*
1524 * We come here as a result of a DSI at a point where we don't want
1525 * to call hash_page, such as when we are accessing memory (possibly
1526 * user memory) inside a PMU interrupt that occurred while interrupts
1527 * were soft-disabled. We want to invoke the exception handler for
1528 * the access, or panic if there isn't a handler.
1529 */
1530 77: bl save_nvgprs
1531 mr r4,r3
1532 addi r3,r1,STACK_FRAME_OVERHEAD
1533 li r5,SIGSEGV
1534 bl bad_page_fault
1535 b ret_from_except
1536
1537 /*
1538 * Here we have detected that the kernel stack pointer is bad.
1539 * R9 contains the saved CR, r13 points to the paca,
1540 * r10 contains the (bad) kernel stack pointer,
1541 * r11 and r12 contain the saved SRR0 and SRR1.
1542 * We switch to using an emergency stack, save the registers there,
1543 * and call kernel_bad_stack(), which panics.
1544 */
1545 bad_stack:
1546 ld r1,PACAEMERGSP(r13)
1547 subi r1,r1,64+INT_FRAME_SIZE
1548 std r9,_CCR(r1)
1549 std r10,GPR1(r1)
1550 std r11,_NIP(r1)
1551 std r12,_MSR(r1)
1552 mfspr r11,SPRN_DAR
1553 mfspr r12,SPRN_DSISR
1554 std r11,_DAR(r1)
1555 std r12,_DSISR(r1)
1556 mflr r10
1557 mfctr r11
1558 mfxer r12
1559 std r10,_LINK(r1)
1560 std r11,_CTR(r1)
1561 std r12,_XER(r1)
1562 SAVE_GPR(0,r1)
1563 SAVE_GPR(2,r1)
1564 ld r10,EX_R3(r3)
1565 std r10,GPR3(r1)
1566 SAVE_GPR(4,r1)
1567 SAVE_4GPRS(5,r1)
1568 ld r9,EX_R9(r3)
1569 ld r10,EX_R10(r3)
1570 SAVE_2GPRS(9,r1)
1571 ld r9,EX_R11(r3)
1572 ld r10,EX_R12(r3)
1573 ld r11,EX_R13(r3)
1574 std r9,GPR11(r1)
1575 std r10,GPR12(r1)
1576 std r11,GPR13(r1)
1577 BEGIN_FTR_SECTION
1578 ld r10,EX_CFAR(r3)
1579 std r10,ORIG_GPR3(r1)
1580 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1581 SAVE_8GPRS(14,r1)
1582 SAVE_10GPRS(22,r1)
1583 lhz r12,PACA_TRAP_SAVE(r13)
1584 std r12,_TRAP(r1)
1585 addi r11,r1,INT_FRAME_SIZE
1586 std r11,0(r1)
1587 li r12,0
1588 std r12,0(r11)
1589 ld r2,PACATOC(r13)
1590 ld r11,exception_marker@toc(r2)
1591 std r12,RESULT(r1)
1592 std r11,STACK_FRAME_OVERHEAD-16(r1)
1593 1: addi r3,r1,STACK_FRAME_OVERHEAD
1594 bl kernel_bad_stack
1595 b 1b
Linux kernel - Deliverables
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