| blob | 3a9ed6ac224b323cf4908e3cfed19ec4ea03d613 |
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 */
15 #include <asm/hw_irq.h>
16 #include <asm/exception-64s.h>
17 #include <asm/ptrace.h>
19 /*
20 * We layout physical memory as follows:
21 * 0x0000 - 0x00ff : Secondary processor spin code
22 * 0x0100 - 0x17ff : pSeries Interrupt prologs
23 * 0x1800 - 0x4000 : interrupt support common interrupt prologs
24 * 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1
25 * 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1
26 * 0x7000 - 0x7fff : FWNMI data area
27 * 0x8000 - 0x8fff : Initial (CPU0) segment table
28 * 0x9000 - : Early init and support code
29 */
30 /* Syscall routine is used twice, in reloc-off and reloc-on paths */
31 #define SYSCALL_PSERIES_1 \
32 BEGIN_FTR_SECTION \
33 cmpdi r0,0x1ebe ; \
34 beq- 1f ; \
35 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
36 mr r9,r13 ; \
37 GET_PACA(r13) ; \
38 mfspr r11,SPRN_SRR0 ; \
39 0:
41 #define SYSCALL_PSERIES_2_RFID \
42 mfspr r12,SPRN_SRR1 ; \
43 ld r10,PACAKBASE(r13) ; \
44 LOAD_HANDLER(r10, system_call_entry) ; \
45 mtspr SPRN_SRR0,r10 ; \
46 ld r10,PACAKMSR(r13) ; \
47 mtspr SPRN_SRR1,r10 ; \
48 rfid ; \
49 b . ; /* prevent speculative execution */
51 #define SYSCALL_PSERIES_3 \
52 /* Fast LE/BE switch system call */ \
53 1: mfspr r12,SPRN_SRR1 ; \
54 xori r12,r12,MSR_LE ; \
55 mtspr SPRN_SRR1,r12 ; \
56 rfid ; /* return to userspace */ \
57 b . ; \
58 2: mfspr r12,SPRN_SRR1 ; \
59 andi. r12,r12,MSR_PR ; \
60 bne 0b ; \
61 mtspr SPRN_SRR0,r3 ; \
62 mtspr SPRN_SRR1,r4 ; \
63 mtspr SPRN_SDR1,r5 ; \
64 rfid ; \
65 b . ; /* prevent speculative execution */
67 #if defined(CONFIG_RELOCATABLE)
68 /*
69 * We can't branch directly; in the direct case we use LR
70 * and system_call_entry restores LR. (We thus need to move
71 * LR to r10 in the RFID case too.)
72 */
73 #define SYSCALL_PSERIES_2_DIRECT \
74 mflr r10 ; \
75 ld r12,PACAKBASE(r13) ; \
76 LOAD_HANDLER(r12, system_call_entry_direct) ; \
77 mtctr r12 ; \
78 mfspr r12,SPRN_SRR1 ; \
79 /* Re-use of r13... No spare regs to do this */ \
80 li r13,MSR_RI ; \
81 mtmsrd r13,1 ; \
82 GET_PACA(r13) ; /* get r13 back */ \
83 bctr ;
84 #else
85 /* We can branch directly */
86 #define SYSCALL_PSERIES_2_DIRECT \
87 mfspr r12,SPRN_SRR1 ; \
88 li r10,MSR_RI ; \
89 mtmsrd r10,1 ; /* Set RI (EE=0) */ \
90 b system_call_entry_direct ;
91 #endif
93 /*
94 * This is the start of the interrupt handlers for pSeries
95 * This code runs with relocation off.
96 * Code from here to __end_interrupts gets copied down to real
97 * address 0x100 when we are running a relocatable kernel.
98 * Therefore any relative branches in this section must only
99 * branch to labels in this section.
100 */
101 . = 0x100
102 .globl __start_interrupts
103 __start_interrupts:
105 .globl system_reset_pSeries;
106 system_reset_pSeries:
107 HMT_MEDIUM_PPR_DISCARD
108 SET_SCRATCH0(r13)
109 #ifdef CONFIG_PPC_P7_NAP
110 BEGIN_FTR_SECTION
111 /* Running native on arch 2.06 or later, check if we are
112 * waking up from nap. We only handle no state loss and
113 * supervisor state loss. We do -not- handle hypervisor
114 * state loss at this time.
115 */
116 mfspr r13,SPRN_SRR1
117 rlwinm. r13,r13,47-31,30,31
118 beq 9f
120 /* waking up from powersave (nap) state */
121 cmpwi cr1,r13,2
122 /* Total loss of HV state is fatal, we could try to use the
123 * PIR to locate a PACA, then use an emergency stack etc...
124 * but for now, let's just stay stuck here
125 */
126 bgt cr1,.
127 GET_PACA(r13)
129 #ifdef CONFIG_KVM_BOOK3S_64_HV
130 li r0,KVM_HWTHREAD_IN_KERNEL
131 stb r0,HSTATE_HWTHREAD_STATE(r13)
132 /* Order setting hwthread_state vs. testing hwthread_req */
133 sync
134 lbz r0,HSTATE_HWTHREAD_REQ(r13)
135 cmpwi r0,0
136 beq 1f
137 b kvm_start_guest
138 1:
139 #endif
141 beq cr1,2f
142 b .power7_wakeup_noloss
143 2: b .power7_wakeup_loss
144 9:
145 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
146 #endif /* CONFIG_PPC_P7_NAP */
147 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
148 NOTEST, 0x100)
150 . = 0x200
151 machine_check_pSeries_1:
152 /* This is moved out of line as it can be patched by FW, but
153 * some code path might still want to branch into the original
154 * vector
155 */
156 HMT_MEDIUM_PPR_DISCARD
157 SET_SCRATCH0(r13) /* save r13 */
158 EXCEPTION_PROLOG_0(PACA_EXMC)
159 b machine_check_pSeries_0
161 . = 0x300
162 .globl data_access_pSeries
163 data_access_pSeries:
164 HMT_MEDIUM_PPR_DISCARD
165 SET_SCRATCH0(r13)
166 BEGIN_FTR_SECTION
167 b data_access_check_stab
168 data_access_not_stab:
169 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
170 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
171 KVMTEST, 0x300)
173 . = 0x380
174 .globl data_access_slb_pSeries
175 data_access_slb_pSeries:
176 HMT_MEDIUM_PPR_DISCARD
177 SET_SCRATCH0(r13)
178 EXCEPTION_PROLOG_0(PACA_EXSLB)
179 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
180 std r3,PACA_EXSLB+EX_R3(r13)
181 mfspr r3,SPRN_DAR
182 #ifdef __DISABLED__
183 /* Keep that around for when we re-implement dynamic VSIDs */
184 cmpdi r3,0
185 bge slb_miss_user_pseries
186 #endif /* __DISABLED__ */
187 mfspr r12,SPRN_SRR1
188 #ifndef CONFIG_RELOCATABLE
189 b .slb_miss_realmode
190 #else
191 /*
192 * We can't just use a direct branch to .slb_miss_realmode
193 * because the distance from here to there depends on where
194 * the kernel ends up being put.
195 */
196 mfctr r11
197 ld r10,PACAKBASE(r13)
198 LOAD_HANDLER(r10, .slb_miss_realmode)
199 mtctr r10
200 bctr
201 #endif
203 STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
205 . = 0x480
206 .globl instruction_access_slb_pSeries
207 instruction_access_slb_pSeries:
208 HMT_MEDIUM_PPR_DISCARD
209 SET_SCRATCH0(r13)
210 EXCEPTION_PROLOG_0(PACA_EXSLB)
211 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
212 std r3,PACA_EXSLB+EX_R3(r13)
213 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
214 #ifdef __DISABLED__
215 /* Keep that around for when we re-implement dynamic VSIDs */
216 cmpdi r3,0
217 bge slb_miss_user_pseries
218 #endif /* __DISABLED__ */
219 mfspr r12,SPRN_SRR1
220 #ifndef CONFIG_RELOCATABLE
221 b .slb_miss_realmode
222 #else
223 mfctr r11
224 ld r10,PACAKBASE(r13)
225 LOAD_HANDLER(r10, .slb_miss_realmode)
226 mtctr r10
227 bctr
228 #endif
230 /* We open code these as we can't have a ". = x" (even with
231 * x = "." within a feature section
232 */
233 . = 0x500;
234 .globl hardware_interrupt_pSeries;
235 .globl hardware_interrupt_hv;
236 hardware_interrupt_pSeries:
237 hardware_interrupt_hv:
238 HMT_MEDIUM_PPR_DISCARD
239 BEGIN_FTR_SECTION
240 _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
241 EXC_HV, SOFTEN_TEST_HV)
242 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
243 FTR_SECTION_ELSE
244 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
245 EXC_STD, SOFTEN_TEST_HV_201)
246 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
247 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
249 STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
250 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
252 STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
253 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
255 STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
256 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
258 . = 0x900
259 .globl decrementer_pSeries
260 decrementer_pSeries:
261 _MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR)
263 STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
265 MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
266 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
268 STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
269 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
271 . = 0xc00
272 .globl system_call_pSeries
273 system_call_pSeries:
274 HMT_MEDIUM
275 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
276 SET_SCRATCH0(r13)
277 GET_PACA(r13)
278 std r9,PACA_EXGEN+EX_R9(r13)
279 std r10,PACA_EXGEN+EX_R10(r13)
280 mfcr r9
281 KVMTEST(0xc00)
282 GET_SCRATCH0(r13)
283 #endif
284 SYSCALL_PSERIES_1
285 SYSCALL_PSERIES_2_RFID
286 SYSCALL_PSERIES_3
287 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
289 STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
290 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
292 /* At 0xe??? we have a bunch of hypervisor exceptions, we branch
293 * out of line to handle them
294 */
295 . = 0xe00
296 hv_data_storage_trampoline:
297 SET_SCRATCH0(r13)
298 EXCEPTION_PROLOG_0(PACA_EXGEN)
299 b h_data_storage_hv
301 . = 0xe20
302 hv_instr_storage_trampoline:
303 SET_SCRATCH0(r13)
304 EXCEPTION_PROLOG_0(PACA_EXGEN)
305 b h_instr_storage_hv
307 . = 0xe40
308 emulation_assist_trampoline:
309 SET_SCRATCH0(r13)
310 EXCEPTION_PROLOG_0(PACA_EXGEN)
311 b emulation_assist_hv
313 . = 0xe60
314 hv_exception_trampoline:
315 SET_SCRATCH0(r13)
316 EXCEPTION_PROLOG_0(PACA_EXGEN)
317 b hmi_exception_hv
319 . = 0xe80
320 hv_doorbell_trampoline:
321 SET_SCRATCH0(r13)
322 EXCEPTION_PROLOG_0(PACA_EXGEN)
323 b h_doorbell_hv
325 /* We need to deal with the Altivec unavailable exception
326 * here which is at 0xf20, thus in the middle of the
327 * prolog code of the PerformanceMonitor one. A little
328 * trickery is thus necessary
329 */
330 . = 0xf00
331 performance_monitor_pseries_trampoline:
332 SET_SCRATCH0(r13)
333 EXCEPTION_PROLOG_0(PACA_EXGEN)
334 b performance_monitor_pSeries
336 . = 0xf20
337 altivec_unavailable_pseries_trampoline:
338 SET_SCRATCH0(r13)
339 EXCEPTION_PROLOG_0(PACA_EXGEN)
340 b altivec_unavailable_pSeries
342 . = 0xf40
343 vsx_unavailable_pseries_trampoline:
344 SET_SCRATCH0(r13)
345 EXCEPTION_PROLOG_0(PACA_EXGEN)
346 b vsx_unavailable_pSeries
348 . = 0xf60
349 facility_unavailable_trampoline:
350 SET_SCRATCH0(r13)
351 EXCEPTION_PROLOG_0(PACA_EXGEN)
352 b facility_unavailable_pSeries
354 . = 0xf80
355 hv_facility_unavailable_trampoline:
356 SET_SCRATCH0(r13)
357 EXCEPTION_PROLOG_0(PACA_EXGEN)
358 b facility_unavailable_hv
360 #ifdef CONFIG_CBE_RAS
361 STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
362 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
363 #endif /* CONFIG_CBE_RAS */
365 STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
366 KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
368 . = 0x1500
369 .global denorm_exception_hv
370 denorm_exception_hv:
371 HMT_MEDIUM_PPR_DISCARD
372 mtspr SPRN_SPRG_HSCRATCH0,r13
373 EXCEPTION_PROLOG_0(PACA_EXGEN)
374 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
376 #ifdef CONFIG_PPC_DENORMALISATION
377 mfspr r10,SPRN_HSRR1
378 mfspr r11,SPRN_HSRR0 /* save HSRR0 */
379 andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
380 addi r11,r11,-4 /* HSRR0 is next instruction */
381 bne+ denorm_assist
382 #endif
384 KVMTEST(0x1500)
385 EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
386 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500)
388 #ifdef CONFIG_CBE_RAS
389 STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
390 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
391 #endif /* CONFIG_CBE_RAS */
393 STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
394 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
396 #ifdef CONFIG_CBE_RAS
397 STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
398 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
399 #else
400 . = 0x1800
401 #endif /* CONFIG_CBE_RAS */
404 /*** Out of line interrupts support ***/
406 .align 7
407 /* moved from 0x200 */
408 machine_check_pSeries:
409 .globl machine_check_fwnmi
410 machine_check_fwnmi:
411 HMT_MEDIUM_PPR_DISCARD
412 SET_SCRATCH0(r13) /* save r13 */
413 EXCEPTION_PROLOG_0(PACA_EXMC)
414 machine_check_pSeries_0:
415 EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200)
416 EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD)
417 KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
419 /* moved from 0x300 */
420 data_access_check_stab:
421 GET_PACA(r13)
422 std r9,PACA_EXSLB+EX_R9(r13)
423 std r10,PACA_EXSLB+EX_R10(r13)
424 mfspr r10,SPRN_DAR
425 mfspr r9,SPRN_DSISR
426 srdi r10,r10,60
427 rlwimi r10,r9,16,0x20
428 #ifdef CONFIG_KVM_BOOK3S_PR
429 lbz r9,HSTATE_IN_GUEST(r13)
430 rlwimi r10,r9,8,0x300
431 #endif
432 mfcr r9
433 cmpwi r10,0x2c
434 beq do_stab_bolted_pSeries
435 mtcrf 0x80,r9
436 ld r9,PACA_EXSLB+EX_R9(r13)
437 ld r10,PACA_EXSLB+EX_R10(r13)
438 b data_access_not_stab
439 do_stab_bolted_pSeries:
440 std r11,PACA_EXSLB+EX_R11(r13)
441 std r12,PACA_EXSLB+EX_R12(r13)
442 GET_SCRATCH0(r10)
443 std r10,PACA_EXSLB+EX_R13(r13)
444 EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD)
446 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
447 KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
448 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400)
449 KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480)
450 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900)
451 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
453 #ifdef CONFIG_PPC_DENORMALISATION
454 denorm_assist:
455 BEGIN_FTR_SECTION
456 /*
457 * To denormalise we need to move a copy of the register to itself.
458 * For POWER6 do that here for all FP regs.
459 */
460 mfmsr r10
461 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
462 xori r10,r10,(MSR_FE0|MSR_FE1)
463 mtmsrd r10
464 sync
466 #define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
467 #define FMR4(n) FMR2(n) ; FMR2(n+2)
468 #define FMR8(n) FMR4(n) ; FMR4(n+4)
469 #define FMR16(n) FMR8(n) ; FMR8(n+8)
470 #define FMR32(n) FMR16(n) ; FMR16(n+16)
471 FMR32(0)
473 FTR_SECTION_ELSE
474 /*
475 * To denormalise we need to move a copy of the register to itself.
476 * For POWER7 do that here for the first 32 VSX registers only.
477 */
478 mfmsr r10
479 oris r10,r10,MSR_VSX@h
480 mtmsrd r10
481 sync
483 #define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
484 #define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
485 #define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
486 #define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
487 #define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
488 XVCPSGNDP32(0)
490 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
492 BEGIN_FTR_SECTION
493 b denorm_done
494 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
495 /*
496 * To denormalise we need to move a copy of the register to itself.
497 * For POWER8 we need to do that for all 64 VSX registers
498 */
499 XVCPSGNDP32(32)
500 denorm_done:
501 mtspr SPRN_HSRR0,r11
502 mtcrf 0x80,r9
503 ld r9,PACA_EXGEN+EX_R9(r13)
504 RESTORE_PPR_PACA(PACA_EXGEN, r10)
505 BEGIN_FTR_SECTION
506 ld r10,PACA_EXGEN+EX_CFAR(r13)
507 mtspr SPRN_CFAR,r10
508 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
509 ld r10,PACA_EXGEN+EX_R10(r13)
510 ld r11,PACA_EXGEN+EX_R11(r13)
511 ld r12,PACA_EXGEN+EX_R12(r13)
512 ld r13,PACA_EXGEN+EX_R13(r13)
513 HRFID
514 b .
515 #endif
517 .align 7
518 /* moved from 0xe00 */
519 STD_EXCEPTION_HV_OOL(0xe02, h_data_storage)
520 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
521 STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage)
522 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
523 STD_EXCEPTION_HV_OOL(0xe42, emulation_assist)
524 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
525 STD_EXCEPTION_HV_OOL(0xe62, hmi_exception) /* need to flush cache ? */
526 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
527 MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell)
528 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
530 /* moved from 0xf00 */
531 STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
532 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00)
533 STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
534 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20)
535 STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
536 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
537 STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
538 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60)
539 STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable)
540 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82)
542 /*
543 * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
544 * - If it was a decrementer interrupt, we bump the dec to max and and return.
545 * - If it was a doorbell we return immediately since doorbells are edge
546 * triggered and won't automatically refire.
547 * - else we hard disable and return.
548 * This is called with r10 containing the value to OR to the paca field.
549 */
550 #define MASKED_INTERRUPT(_H) \
551 masked_##_H##interrupt: \
552 std r11,PACA_EXGEN+EX_R11(r13); \
553 lbz r11,PACAIRQHAPPENED(r13); \
554 or r11,r11,r10; \
555 stb r11,PACAIRQHAPPENED(r13); \
556 cmpwi r10,PACA_IRQ_DEC; \
557 bne 1f; \
558 lis r10,0x7fff; \
559 ori r10,r10,0xffff; \
560 mtspr SPRN_DEC,r10; \
561 b 2f; \
562 1: cmpwi r10,PACA_IRQ_DBELL; \
563 beq 2f; \
564 mfspr r10,SPRN_##_H##SRR1; \
565 rldicl r10,r10,48,1; /* clear MSR_EE */ \
566 rotldi r10,r10,16; \
567 mtspr SPRN_##_H##SRR1,r10; \
568 2: mtcrf 0x80,r9; \
569 ld r9,PACA_EXGEN+EX_R9(r13); \
570 ld r10,PACA_EXGEN+EX_R10(r13); \
571 ld r11,PACA_EXGEN+EX_R11(r13); \
572 GET_SCRATCH0(r13); \
573 ##_H##rfid; \
574 b .
576 MASKED_INTERRUPT()
577 MASKED_INTERRUPT(H)
579 /*
580 * Called from arch_local_irq_enable when an interrupt needs
581 * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
582 * which kind of interrupt. MSR:EE is already off. We generate a
583 * stackframe like if a real interrupt had happened.
584 *
585 * Note: While MSR:EE is off, we need to make sure that _MSR
586 * in the generated frame has EE set to 1 or the exception
587 * handler will not properly re-enable them.
588 */
589 _GLOBAL(__replay_interrupt)
590 /* We are going to jump to the exception common code which
591 * will retrieve various register values from the PACA which
592 * we don't give a damn about, so we don't bother storing them.
593 */
594 mfmsr r12
595 mflr r11
596 mfcr r9
597 ori r12,r12,MSR_EE
598 cmpwi r3,0x900
599 beq decrementer_common
600 cmpwi r3,0x500
601 beq hardware_interrupt_common
602 BEGIN_FTR_SECTION
603 cmpwi r3,0xe80
604 beq h_doorbell_common
605 FTR_SECTION_ELSE
606 cmpwi r3,0xa00
607 beq doorbell_super_common
608 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
609 blr
611 #ifdef CONFIG_PPC_PSERIES
612 /*
613 * Vectors for the FWNMI option. Share common code.
614 */
615 .globl system_reset_fwnmi
616 .align 7
617 system_reset_fwnmi:
618 HMT_MEDIUM_PPR_DISCARD
619 SET_SCRATCH0(r13) /* save r13 */
620 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
621 NOTEST, 0x100)
623 #endif /* CONFIG_PPC_PSERIES */
625 #ifdef __DISABLED__
626 /*
627 * This is used for when the SLB miss handler has to go virtual,
628 * which doesn't happen for now anymore but will once we re-implement
629 * dynamic VSIDs for shared page tables
630 */
631 slb_miss_user_pseries:
632 std r10,PACA_EXGEN+EX_R10(r13)
633 std r11,PACA_EXGEN+EX_R11(r13)
634 std r12,PACA_EXGEN+EX_R12(r13)
635 GET_SCRATCH0(r10)
636 ld r11,PACA_EXSLB+EX_R9(r13)
637 ld r12,PACA_EXSLB+EX_R3(r13)
638 std r10,PACA_EXGEN+EX_R13(r13)
639 std r11,PACA_EXGEN+EX_R9(r13)
640 std r12,PACA_EXGEN+EX_R3(r13)
641 clrrdi r12,r13,32
642 mfmsr r10
643 mfspr r11,SRR0 /* save SRR0 */
644 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
645 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
646 mtspr SRR0,r12
647 mfspr r12,SRR1 /* and SRR1 */
648 mtspr SRR1,r10
649 rfid
650 b . /* prevent spec. execution */
651 #endif /* __DISABLED__ */
653 /*
654 * Code from here down to __end_handlers is invoked from the
655 * exception prologs above. Because the prologs assemble the
656 * addresses of these handlers using the LOAD_HANDLER macro,
657 * which uses an ori instruction, these handlers must be in
658 * the first 64k of the kernel image.
659 */
661 /*** Common interrupt handlers ***/
663 STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
665 /*
666 * Machine check is different because we use a different
667 * save area: PACA_EXMC instead of PACA_EXGEN.
668 */
669 .align 7
670 .globl machine_check_common
671 machine_check_common:
673 mfspr r10,SPRN_DAR
674 std r10,PACA_EXGEN+EX_DAR(r13)
675 mfspr r10,SPRN_DSISR
676 stw r10,PACA_EXGEN+EX_DSISR(r13)
677 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
678 FINISH_NAP
679 DISABLE_INTS
680 ld r3,PACA_EXGEN+EX_DAR(r13)
681 lwz r4,PACA_EXGEN+EX_DSISR(r13)
682 std r3,_DAR(r1)
683 std r4,_DSISR(r1)
684 bl .save_nvgprs
685 addi r3,r1,STACK_FRAME_OVERHEAD
686 bl .machine_check_exception
687 b .ret_from_except
689 STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
690 STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt)
691 STD_EXCEPTION_COMMON(0x980, hdecrementer, .hdec_interrupt)
692 #ifdef CONFIG_PPC_DOORBELL
693 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .doorbell_exception)
694 #else
695 STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .unknown_exception)
696 #endif
697 STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
698 STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
699 STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
700 STD_EXCEPTION_COMMON(0xe40, emulation_assist, .emulation_assist_interrupt)
701 STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception)
702 #ifdef CONFIG_PPC_DOORBELL
703 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .doorbell_exception)
704 #else
705 STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .unknown_exception)
706 #endif
707 STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception)
708 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
709 STD_EXCEPTION_COMMON(0x1502, denorm, .unknown_exception)
710 #ifdef CONFIG_ALTIVEC
711 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
712 #else
713 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
714 #endif
715 #ifdef CONFIG_CBE_RAS
716 STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception)
717 STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception)
718 STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception)
719 #endif /* CONFIG_CBE_RAS */
721 /*
722 * Relocation-on interrupts: A subset of the interrupts can be delivered
723 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
724 * it. Addresses are the same as the original interrupt addresses, but
725 * offset by 0xc000000000004000.
726 * It's impossible to receive interrupts below 0x300 via this mechanism.
727 * KVM: None of these traps are from the guest ; anything that escalated
728 * to HV=1 from HV=0 is delivered via real mode handlers.
729 */
731 /*
732 * This uses the standard macro, since the original 0x300 vector
733 * only has extra guff for STAB-based processors -- which never
734 * come here.
735 */
736 STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access)
737 . = 0x4380
738 .globl data_access_slb_relon_pSeries
739 data_access_slb_relon_pSeries:
740 SET_SCRATCH0(r13)
741 EXCEPTION_PROLOG_0(PACA_EXSLB)
742 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
743 std r3,PACA_EXSLB+EX_R3(r13)
744 mfspr r3,SPRN_DAR
745 mfspr r12,SPRN_SRR1
746 #ifndef CONFIG_RELOCATABLE
747 b .slb_miss_realmode
748 #else
749 /*
750 * We can't just use a direct branch to .slb_miss_realmode
751 * because the distance from here to there depends on where
752 * the kernel ends up being put.
753 */
754 mfctr r11
755 ld r10,PACAKBASE(r13)
756 LOAD_HANDLER(r10, .slb_miss_realmode)
757 mtctr r10
758 bctr
759 #endif
761 STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access)
762 . = 0x4480
763 .globl instruction_access_slb_relon_pSeries
764 instruction_access_slb_relon_pSeries:
765 SET_SCRATCH0(r13)
766 EXCEPTION_PROLOG_0(PACA_EXSLB)
767 EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
768 std r3,PACA_EXSLB+EX_R3(r13)
769 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
770 mfspr r12,SPRN_SRR1
771 #ifndef CONFIG_RELOCATABLE
772 b .slb_miss_realmode
773 #else
774 mfctr r11
775 ld r10,PACAKBASE(r13)
776 LOAD_HANDLER(r10, .slb_miss_realmode)
777 mtctr r10
778 bctr
779 #endif
781 . = 0x4500
782 .globl hardware_interrupt_relon_pSeries;
783 .globl hardware_interrupt_relon_hv;
784 hardware_interrupt_relon_pSeries:
785 hardware_interrupt_relon_hv:
786 BEGIN_FTR_SECTION
787 _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
788 FTR_SECTION_ELSE
789 _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
790 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
791 STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
792 STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
793 STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
794 MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
795 STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
796 MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
797 STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
799 . = 0x4c00
800 .globl system_call_relon_pSeries
801 system_call_relon_pSeries:
802 HMT_MEDIUM
803 SYSCALL_PSERIES_1
804 SYSCALL_PSERIES_2_DIRECT
805 SYSCALL_PSERIES_3
807 STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step)
809 . = 0x4e00
810 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
812 . = 0x4e20
813 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
815 . = 0x4e40
816 emulation_assist_relon_trampoline:
817 SET_SCRATCH0(r13)
818 EXCEPTION_PROLOG_0(PACA_EXGEN)
819 b emulation_assist_relon_hv
821 . = 0x4e60
822 b . /* Can't happen, see v2.07 Book III-S section 6.5 */
824 . = 0x4e80
825 h_doorbell_relon_trampoline:
826 SET_SCRATCH0(r13)
827 EXCEPTION_PROLOG_0(PACA_EXGEN)
828 b h_doorbell_relon_hv
830 . = 0x4f00
831 performance_monitor_relon_pseries_trampoline:
832 SET_SCRATCH0(r13)
833 EXCEPTION_PROLOG_0(PACA_EXGEN)
834 b performance_monitor_relon_pSeries
836 . = 0x4f20
837 altivec_unavailable_relon_pseries_trampoline:
838 SET_SCRATCH0(r13)
839 EXCEPTION_PROLOG_0(PACA_EXGEN)
840 b altivec_unavailable_relon_pSeries
842 . = 0x4f40
843 vsx_unavailable_relon_pseries_trampoline:
844 SET_SCRATCH0(r13)
845 EXCEPTION_PROLOG_0(PACA_EXGEN)
846 b vsx_unavailable_relon_pSeries
848 . = 0x4f60
849 facility_unavailable_relon_trampoline:
850 SET_SCRATCH0(r13)
851 EXCEPTION_PROLOG_0(PACA_EXGEN)
852 b facility_unavailable_relon_pSeries
854 . = 0x4f80
855 hv_facility_unavailable_relon_trampoline:
856 SET_SCRATCH0(r13)
857 EXCEPTION_PROLOG_0(PACA_EXGEN)
858 b hv_facility_unavailable_relon_hv
860 STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
861 #ifdef CONFIG_PPC_DENORMALISATION
862 . = 0x5500
863 b denorm_exception_hv
864 #endif
865 STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist)
867 /* Other future vectors */
868 .align 7
869 .globl __end_interrupts
870 __end_interrupts:
872 .align 7
873 system_call_entry_direct:
874 #if defined(CONFIG_RELOCATABLE)
875 /* The first level prologue may have used LR to get here, saving
876 * orig in r10. To save hacking/ifdeffing common code, restore here.
877 */
878 mtlr r10
879 #endif
880 system_call_entry:
881 b system_call_common
883 ppc64_runlatch_on_trampoline:
884 b .__ppc64_runlatch_on
886 /*
887 * Here we have detected that the kernel stack pointer is bad.
888 * R9 contains the saved CR, r13 points to the paca,
889 * r10 contains the (bad) kernel stack pointer,
890 * r11 and r12 contain the saved SRR0 and SRR1.
891 * We switch to using an emergency stack, save the registers there,
892 * and call kernel_bad_stack(), which panics.
893 */
894 bad_stack:
895 ld r1,PACAEMERGSP(r13)
896 subi r1,r1,64+INT_FRAME_SIZE
897 std r9,_CCR(r1)
898 std r10,GPR1(r1)
899 std r11,_NIP(r1)
900 std r12,_MSR(r1)
901 mfspr r11,SPRN_DAR
902 mfspr r12,SPRN_DSISR
903 std r11,_DAR(r1)
904 std r12,_DSISR(r1)
905 mflr r10
906 mfctr r11
907 mfxer r12
908 std r10,_LINK(r1)
909 std r11,_CTR(r1)
910 std r12,_XER(r1)
911 SAVE_GPR(0,r1)
912 SAVE_GPR(2,r1)
913 ld r10,EX_R3(r3)
914 std r10,GPR3(r1)
915 SAVE_GPR(4,r1)
916 SAVE_4GPRS(5,r1)
917 ld r9,EX_R9(r3)
918 ld r10,EX_R10(r3)
919 SAVE_2GPRS(9,r1)
920 ld r9,EX_R11(r3)
921 ld r10,EX_R12(r3)
922 ld r11,EX_R13(r3)
923 std r9,GPR11(r1)
924 std r10,GPR12(r1)
925 std r11,GPR13(r1)
926 BEGIN_FTR_SECTION
927 ld r10,EX_CFAR(r3)
928 std r10,ORIG_GPR3(r1)
929 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
930 SAVE_8GPRS(14,r1)
931 SAVE_10GPRS(22,r1)
932 lhz r12,PACA_TRAP_SAVE(r13)
933 std r12,_TRAP(r1)
934 addi r11,r1,INT_FRAME_SIZE
935 std r11,0(r1)
936 li r12,0
937 std r12,0(r11)
938 ld r2,PACATOC(r13)
939 ld r11,exception_marker@toc(r2)
940 std r12,RESULT(r1)
941 std r11,STACK_FRAME_OVERHEAD-16(r1)
942 1: addi r3,r1,STACK_FRAME_OVERHEAD
943 bl .kernel_bad_stack
944 b 1b
946 /*
947 * Here r13 points to the paca, r9 contains the saved CR,
948 * SRR0 and SRR1 are saved in r11 and r12,
949 * r9 - r13 are saved in paca->exgen.
950 */
951 .align 7
952 .globl data_access_common
953 data_access_common:
954 mfspr r10,SPRN_DAR
955 std r10,PACA_EXGEN+EX_DAR(r13)
956 mfspr r10,SPRN_DSISR
957 stw r10,PACA_EXGEN+EX_DSISR(r13)
958 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
959 DISABLE_INTS
960 ld r12,_MSR(r1)
961 ld r3,PACA_EXGEN+EX_DAR(r13)
962 lwz r4,PACA_EXGEN+EX_DSISR(r13)
963 li r5,0x300
964 b .do_hash_page /* Try to handle as hpte fault */
966 .align 7
967 .globl h_data_storage_common
968 h_data_storage_common:
969 mfspr r10,SPRN_HDAR
970 std r10,PACA_EXGEN+EX_DAR(r13)
971 mfspr r10,SPRN_HDSISR
972 stw r10,PACA_EXGEN+EX_DSISR(r13)
973 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
974 bl .save_nvgprs
975 DISABLE_INTS
976 addi r3,r1,STACK_FRAME_OVERHEAD
977 bl .unknown_exception
978 b .ret_from_except
980 .align 7
981 .globl instruction_access_common
982 instruction_access_common:
983 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
984 DISABLE_INTS
985 ld r12,_MSR(r1)
986 ld r3,_NIP(r1)
987 andis. r4,r12,0x5820
988 li r5,0x400
989 b .do_hash_page /* Try to handle as hpte fault */
991 STD_EXCEPTION_COMMON(0xe20, h_instr_storage, .unknown_exception)
993 /*
994 * Here is the common SLB miss user that is used when going to virtual
995 * mode for SLB misses, that is currently not used
996 */
997 #ifdef __DISABLED__
998 .align 7
999 .globl slb_miss_user_common
1000 slb_miss_user_common:
1001 mflr r10
1002 std r3,PACA_EXGEN+EX_DAR(r13)
1003 stw r9,PACA_EXGEN+EX_CCR(r13)
1004 std r10,PACA_EXGEN+EX_LR(r13)
1005 std r11,PACA_EXGEN+EX_SRR0(r13)
1006 bl .slb_allocate_user
1008 ld r10,PACA_EXGEN+EX_LR(r13)
1009 ld r3,PACA_EXGEN+EX_R3(r13)
1010 lwz r9,PACA_EXGEN+EX_CCR(r13)
1011 ld r11,PACA_EXGEN+EX_SRR0(r13)
1012 mtlr r10
1013 beq- slb_miss_fault
1015 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1016 beq- unrecov_user_slb
1017 mfmsr r10
1019 .machine push
1020 .machine "power4"
1021 mtcrf 0x80,r9
1022 .machine pop
1024 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
1025 mtmsrd r10,1
1027 mtspr SRR0,r11
1028 mtspr SRR1,r12
1030 ld r9,PACA_EXGEN+EX_R9(r13)
1031 ld r10,PACA_EXGEN+EX_R10(r13)
1032 ld r11,PACA_EXGEN+EX_R11(r13)
1033 ld r12,PACA_EXGEN+EX_R12(r13)
1034 ld r13,PACA_EXGEN+EX_R13(r13)
1035 rfid
1036 b .
1038 slb_miss_fault:
1039 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
1040 ld r4,PACA_EXGEN+EX_DAR(r13)
1041 li r5,0
1042 std r4,_DAR(r1)
1043 std r5,_DSISR(r1)
1044 b handle_page_fault
1046 unrecov_user_slb:
1047 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
1048 DISABLE_INTS
1049 bl .save_nvgprs
1050 1: addi r3,r1,STACK_FRAME_OVERHEAD
1051 bl .unrecoverable_exception
1052 b 1b
1054 #endif /* __DISABLED__ */
1057 .align 7
1058 .globl alignment_common
1059 alignment_common:
1060 mfspr r10,SPRN_DAR
1061 std r10,PACA_EXGEN+EX_DAR(r13)
1062 mfspr r10,SPRN_DSISR
1063 stw r10,PACA_EXGEN+EX_DSISR(r13)
1064 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1065 ld r3,PACA_EXGEN+EX_DAR(r13)
1066 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1067 std r3,_DAR(r1)
1068 std r4,_DSISR(r1)
1069 bl .save_nvgprs
1070 DISABLE_INTS
1071 addi r3,r1,STACK_FRAME_OVERHEAD
1072 bl .alignment_exception
1073 b .ret_from_except
1075 .align 7
1076 .globl program_check_common
1077 program_check_common:
1078 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1079 bl .save_nvgprs
1080 DISABLE_INTS
1081 addi r3,r1,STACK_FRAME_OVERHEAD
1082 bl .program_check_exception
1083 b .ret_from_except
1085 .align 7
1086 .globl fp_unavailable_common
1087 fp_unavailable_common:
1088 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1089 bne 1f /* if from user, just load it up */
1090 bl .save_nvgprs
1091 DISABLE_INTS
1092 addi r3,r1,STACK_FRAME_OVERHEAD
1093 bl .kernel_fp_unavailable_exception
1094 BUG_OPCODE
1095 1:
1096 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1097 BEGIN_FTR_SECTION
1098 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1099 * transaction), go do TM stuff
1100 */
1101 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1102 bne- 2f
1103 END_FTR_SECTION_IFSET(CPU_FTR_TM)
1104 #endif
1105 bl .load_up_fpu
1106 b fast_exception_return
1107 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1108 2: /* User process was in a transaction */
1109 bl .save_nvgprs
1110 DISABLE_INTS
1111 addi r3,r1,STACK_FRAME_OVERHEAD
1112 bl .fp_unavailable_tm
1113 b .ret_from_except
1114 #endif
1115 .align 7
1116 .globl altivec_unavailable_common
1117 altivec_unavailable_common:
1118 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1119 #ifdef CONFIG_ALTIVEC
1120 BEGIN_FTR_SECTION
1121 beq 1f
1122 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1123 BEGIN_FTR_SECTION_NESTED(69)
1124 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1125 * transaction), go do TM stuff
1126 */
1127 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1128 bne- 2f
1129 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1130 #endif
1131 bl .load_up_altivec
1132 b fast_exception_return
1133 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1134 2: /* User process was in a transaction */
1135 bl .save_nvgprs
1136 DISABLE_INTS
1137 addi r3,r1,STACK_FRAME_OVERHEAD
1138 bl .altivec_unavailable_tm
1139 b .ret_from_except
1140 #endif
1141 1:
1142 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1143 #endif
1144 bl .save_nvgprs
1145 DISABLE_INTS
1146 addi r3,r1,STACK_FRAME_OVERHEAD
1147 bl .altivec_unavailable_exception
1148 b .ret_from_except
1150 .align 7
1151 .globl vsx_unavailable_common
1152 vsx_unavailable_common:
1153 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
1154 #ifdef CONFIG_VSX
1155 BEGIN_FTR_SECTION
1156 beq 1f
1157 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1158 BEGIN_FTR_SECTION_NESTED(69)
1159 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1160 * transaction), go do TM stuff
1161 */
1162 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1163 bne- 2f
1164 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
1165 #endif
1166 b .load_up_vsx
1167 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1168 2: /* User process was in a transaction */
1169 bl .save_nvgprs
1170 DISABLE_INTS
1171 addi r3,r1,STACK_FRAME_OVERHEAD
1172 bl .vsx_unavailable_tm
1173 b .ret_from_except
1174 #endif
1175 1:
1176 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
1177 #endif
1178 bl .save_nvgprs
1179 DISABLE_INTS
1180 addi r3,r1,STACK_FRAME_OVERHEAD
1181 bl .vsx_unavailable_exception
1182 b .ret_from_except
1184 STD_EXCEPTION_COMMON(0xf60, facility_unavailable, .facility_unavailable_exception)
1185 STD_EXCEPTION_COMMON(0xf80, hv_facility_unavailable, .facility_unavailable_exception)
1187 .align 7
1188 .globl __end_handlers
1189 __end_handlers:
1191 /* Equivalents to the above handlers for relocation-on interrupt vectors */
1192 STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
1193 MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell)
1195 STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
1196 STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
1197 STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
1198 STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
1199 STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_unavailable)
1201 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
1202 /*
1203 * Data area reserved for FWNMI option.
1204 * This address (0x7000) is fixed by the RPA.
1205 */
1206 .= 0x7000
1207 .globl fwnmi_data_area
1208 fwnmi_data_area:
1210 /* pseries and powernv need to keep the whole page from
1211 * 0x7000 to 0x8000 free for use by the firmware
1212 */
1213 . = 0x8000
1214 #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1216 /* Space for CPU0's segment table */
1217 .balign 4096
1218 .globl initial_stab
1219 initial_stab:
1220 .space 4096
1222 #ifdef CONFIG_PPC_POWERNV
1223 _GLOBAL(opal_mc_secondary_handler)
1224 HMT_MEDIUM_PPR_DISCARD
1225 SET_SCRATCH0(r13)
1226 GET_PACA(r13)
1227 clrldi r3,r3,2
1228 tovirt(r3,r3)
1229 std r3,PACA_OPAL_MC_EVT(r13)
1230 ld r13,OPAL_MC_SRR0(r3)
1231 mtspr SPRN_SRR0,r13
1232 ld r13,OPAL_MC_SRR1(r3)
1233 mtspr SPRN_SRR1,r13
1234 ld r3,OPAL_MC_GPR3(r3)
1235 GET_SCRATCH0(r13)
1236 b machine_check_pSeries
1237 #endif /* CONFIG_PPC_POWERNV */
1240 /*
1241 * r13 points to the PACA, r9 contains the saved CR,
1242 * r12 contain the saved SRR1, SRR0 is still ready for return
1243 * r3 has the faulting address
1244 * r9 - r13 are saved in paca->exslb.
1245 * r3 is saved in paca->slb_r3
1246 * We assume we aren't going to take any exceptions during this procedure.
1247 */
1248 _GLOBAL(slb_miss_realmode)
1249 mflr r10
1250 #ifdef CONFIG_RELOCATABLE
1251 mtctr r11
1252 #endif
1254 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1255 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
1257 bl .slb_allocate_realmode
1259 /* All done -- return from exception. */
1261 ld r10,PACA_EXSLB+EX_LR(r13)
1262 ld r3,PACA_EXSLB+EX_R3(r13)
1263 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1265 mtlr r10
1267 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1268 beq- 2f
1270 .machine push
1271 .machine "power4"
1272 mtcrf 0x80,r9
1273 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
1274 .machine pop
1276 RESTORE_PPR_PACA(PACA_EXSLB, r9)
1277 ld r9,PACA_EXSLB+EX_R9(r13)
1278 ld r10,PACA_EXSLB+EX_R10(r13)
1279 ld r11,PACA_EXSLB+EX_R11(r13)
1280 ld r12,PACA_EXSLB+EX_R12(r13)
1281 ld r13,PACA_EXSLB+EX_R13(r13)
1282 rfid
1283 b . /* prevent speculative execution */
1285 2: mfspr r11,SPRN_SRR0
1286 ld r10,PACAKBASE(r13)
1287 LOAD_HANDLER(r10,unrecov_slb)
1288 mtspr SPRN_SRR0,r10
1289 ld r10,PACAKMSR(r13)
1290 mtspr SPRN_SRR1,r10
1291 rfid
1292 b .
1294 unrecov_slb:
1295 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1296 DISABLE_INTS
1297 bl .save_nvgprs
1298 1: addi r3,r1,STACK_FRAME_OVERHEAD
1299 bl .unrecoverable_exception
1300 b 1b
1303 #ifdef CONFIG_PPC_970_NAP
1304 power4_fixup_nap:
1305 andc r9,r9,r10
1306 std r9,TI_LOCAL_FLAGS(r11)
1307 ld r10,_LINK(r1) /* make idle task do the */
1308 std r10,_NIP(r1) /* equivalent of a blr */
1309 blr
1310 #endif
1312 /*
1313 * Hash table stuff
1314 */
1315 .align 7
1316 _STATIC(do_hash_page)
1317 std r3,_DAR(r1)
1318 std r4,_DSISR(r1)
1320 andis. r0,r4,0xa410 /* weird error? */
1321 bne- handle_page_fault /* if not, try to insert a HPTE */
1322 andis. r0,r4,DSISR_DABRMATCH@h
1323 bne- handle_dabr_fault
1325 BEGIN_FTR_SECTION
1326 andis. r0,r4,0x0020 /* Is it a segment table fault? */
1327 bne- do_ste_alloc /* If so handle it */
1328 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
1330 CURRENT_THREAD_INFO(r11, r1)
1331 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
1332 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
1333 bne 77f /* then don't call hash_page now */
1334 /*
1335 * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1336 * accessing a userspace segment (even from the kernel). We assume
1337 * kernel addresses always have the high bit set.
1338 */
1339 rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1340 rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
1341 orc r0,r12,r0 /* MSR_PR | ~high_bit */
1342 rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
1343 ori r4,r4,1 /* add _PAGE_PRESENT */
1344 rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
1346 /*
1347 * r3 contains the faulting address
1348 * r4 contains the required access permissions
1349 * r5 contains the trap number
1350 *
1351 * at return r3 = 0 for success, 1 for page fault, negative for error
1352 */
1353 bl .hash_page /* build HPTE if possible */
1354 cmpdi r3,0 /* see if hash_page succeeded */
1356 /* Success */
1357 beq fast_exc_return_irq /* Return from exception on success */
1359 /* Error */
1360 blt- 13f
1362 /* Here we have a page fault that hash_page can't handle. */
1363 handle_page_fault:
1364 11: ld r4,_DAR(r1)
1365 ld r5,_DSISR(r1)
1366 addi r3,r1,STACK_FRAME_OVERHEAD
1367 bl .do_page_fault
1368 cmpdi r3,0
1369 beq+ 12f
1370 bl .save_nvgprs
1371 mr r5,r3
1372 addi r3,r1,STACK_FRAME_OVERHEAD
1373 lwz r4,_DAR(r1)
1374 bl .bad_page_fault
1375 b .ret_from_except
1377 /* We have a data breakpoint exception - handle it */
1378 handle_dabr_fault:
1379 bl .save_nvgprs
1380 ld r4,_DAR(r1)
1381 ld r5,_DSISR(r1)
1382 addi r3,r1,STACK_FRAME_OVERHEAD
1383 bl .do_break
1384 12: b .ret_from_except_lite
1387 /* We have a page fault that hash_page could handle but HV refused
1388 * the PTE insertion
1389 */
1390 13: bl .save_nvgprs
1391 mr r5,r3
1392 addi r3,r1,STACK_FRAME_OVERHEAD
1393 ld r4,_DAR(r1)
1394 bl .low_hash_fault
1395 b .ret_from_except
1397 /*
1398 * We come here as a result of a DSI at a point where we don't want
1399 * to call hash_page, such as when we are accessing memory (possibly
1400 * user memory) inside a PMU interrupt that occurred while interrupts
1401 * were soft-disabled. We want to invoke the exception handler for
1402 * the access, or panic if there isn't a handler.
1403 */
1404 77: bl .save_nvgprs
1405 mr r4,r3
1406 addi r3,r1,STACK_FRAME_OVERHEAD
1407 li r5,SIGSEGV
1408 bl .bad_page_fault
1409 b .ret_from_except
1411 /* here we have a segment miss */
1412 do_ste_alloc:
1413 bl .ste_allocate /* try to insert stab entry */
1414 cmpdi r3,0
1415 bne- handle_page_fault
1416 b fast_exception_return
1418 /*
1419 * r13 points to the PACA, r9 contains the saved CR,
1420 * r11 and r12 contain the saved SRR0 and SRR1.
1421 * r9 - r13 are saved in paca->exslb.
1422 * We assume we aren't going to take any exceptions during this procedure.
1423 * We assume (DAR >> 60) == 0xc.
1424 */
1425 .align 7
1426 _GLOBAL(do_stab_bolted)
1427 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1428 std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */
1429 mfspr r11,SPRN_DAR /* ea */
1431 /*
1432 * check for bad kernel/user address
1433 * (ea & ~REGION_MASK) >= PGTABLE_RANGE
1434 */
1435 rldicr. r9,r11,4,(63 - 46 - 4)
1436 li r9,0 /* VSID = 0 for bad address */
1437 bne- 0f
1439 /*
1440 * Calculate VSID:
1441 * This is the kernel vsid, we take the top for context from
1442 * the range. context = (MAX_USER_CONTEXT) + ((ea >> 60) - 0xc) + 1
1443 * Here we know that (ea >> 60) == 0xc
1444 */
1445 lis r9,(MAX_USER_CONTEXT + 1)@ha
1446 addi r9,r9,(MAX_USER_CONTEXT + 1)@l
1448 srdi r10,r11,SID_SHIFT
1449 rldimi r10,r9,ESID_BITS,0 /* proto vsid */
1450 ASM_VSID_SCRAMBLE(r10, r9, 256M)
1451 rldic r9,r10,12,16 /* r9 = vsid << 12 */
1453 0:
1454 /* Hash to the primary group */
1455 ld r10,PACASTABVIRT(r13)
1456 srdi r11,r11,SID_SHIFT
1457 rldimi r10,r11,7,52 /* r10 = first ste of the group */
1459 /* Search the primary group for a free entry */
1460 1: ld r11,0(r10) /* Test valid bit of the current ste */
1461 andi. r11,r11,0x80
1462 beq 2f
1463 addi r10,r10,16
1464 andi. r11,r10,0x70
1465 bne 1b
1467 /* Stick for only searching the primary group for now. */
1468 /* At least for now, we use a very simple random castout scheme */
1469 /* Use the TB as a random number ; OR in 1 to avoid entry 0 */
1470 mftb r11
1471 rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */
1472 ori r11,r11,0x10
1474 /* r10 currently points to an ste one past the group of interest */
1475 /* make it point to the randomly selected entry */
1476 subi r10,r10,128
1477 or r10,r10,r11 /* r10 is the entry to invalidate */
1479 isync /* mark the entry invalid */
1480 ld r11,0(r10)
1481 rldicl r11,r11,56,1 /* clear the valid bit */
1482 rotldi r11,r11,8
1483 std r11,0(r10)
1484 sync
1486 clrrdi r11,r11,28 /* Get the esid part of the ste */
1487 slbie r11
1489 2: std r9,8(r10) /* Store the vsid part of the ste */
1490 eieio
1492 mfspr r11,SPRN_DAR /* Get the new esid */
1493 clrrdi r11,r11,28 /* Permits a full 32b of ESID */
1494 ori r11,r11,0x90 /* Turn on valid and kp */
1495 std r11,0(r10) /* Put new entry back into the stab */
1497 sync
1499 /* All done -- return from exception. */
1500 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1501 ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */
1503 andi. r10,r12,MSR_RI
1504 beq- unrecov_slb
1506 mtcrf 0x80,r9 /* restore CR */
1508 mfmsr r10
1509 clrrdi r10,r10,2
1510 mtmsrd r10,1
1512 mtspr SPRN_SRR0,r11
1513 mtspr SPRN_SRR1,r12
1514 ld r9,PACA_EXSLB+EX_R9(r13)
1515 ld r10,PACA_EXSLB+EX_R10(r13)
1516 ld r11,PACA_EXSLB+EX_R11(r13)
1517 ld r12,PACA_EXSLB+EX_R12(r13)
1518 ld r13,PACA_EXSLB+EX_R13(r13)
1519 rfid
1520 b . /* prevent speculative execution */