| blob | e894515e77bbfa950c7d3e00cfbaafa07d0a0075 |
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 - 0x2fff : pSeries Interrupt prologs
23 * 0x3000 - 0x5fff : interrupt support common interrupt prologs
24 * 0x6000 - 0x6fff : Initial (CPU0) segment table
25 * 0x7000 - 0x7fff : FWNMI data area
26 * 0x8000 - : Early init and support code
27 */
29 /*
30 * This is the start of the interrupt handlers for pSeries
31 * This code runs with relocation off.
32 * Code from here to __end_interrupts gets copied down to real
33 * address 0x100 when we are running a relocatable kernel.
34 * Therefore any relative branches in this section must only
35 * branch to labels in this section.
36 */
37 . = 0x100
38 .globl __start_interrupts
39 __start_interrupts:
41 .globl system_reset_pSeries;
42 system_reset_pSeries:
43 HMT_MEDIUM;
44 SET_SCRATCH0(r13)
45 #ifdef CONFIG_PPC_P7_NAP
46 BEGIN_FTR_SECTION
47 /* Running native on arch 2.06 or later, check if we are
48 * waking up from nap. We only handle no state loss and
49 * supervisor state loss. We do -not- handle hypervisor
50 * state loss at this time.
51 */
52 mfspr r13,SPRN_SRR1
53 rlwinm. r13,r13,47-31,30,31
54 beq 9f
56 /* waking up from powersave (nap) state */
57 cmpwi cr1,r13,2
58 /* Total loss of HV state is fatal, we could try to use the
59 * PIR to locate a PACA, then use an emergency stack etc...
60 * but for now, let's just stay stuck here
61 */
62 bgt cr1,.
63 GET_PACA(r13)
65 #ifdef CONFIG_KVM_BOOK3S_64_HV
66 li r0,KVM_HWTHREAD_IN_KERNEL
67 stb r0,HSTATE_HWTHREAD_STATE(r13)
68 /* Order setting hwthread_state vs. testing hwthread_req */
69 sync
70 lbz r0,HSTATE_HWTHREAD_REQ(r13)
71 cmpwi r0,0
72 beq 1f
73 b kvm_start_guest
74 1:
75 #endif
77 beq cr1,2f
78 b .power7_wakeup_noloss
79 2: b .power7_wakeup_loss
80 9:
81 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
82 #endif /* CONFIG_PPC_P7_NAP */
83 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
84 NOTEST, 0x100)
86 . = 0x200
87 machine_check_pSeries_1:
88 /* This is moved out of line as it can be patched by FW, but
89 * some code path might still want to branch into the original
90 * vector
91 */
92 b machine_check_pSeries
94 . = 0x300
95 .globl data_access_pSeries
96 data_access_pSeries:
97 HMT_MEDIUM
98 SET_SCRATCH0(r13)
99 BEGIN_FTR_SECTION
100 b data_access_check_stab
101 data_access_not_stab:
102 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
103 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
104 KVMTEST, 0x300)
106 . = 0x380
107 .globl data_access_slb_pSeries
108 data_access_slb_pSeries:
109 HMT_MEDIUM
110 SET_SCRATCH0(r13)
111 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
112 std r3,PACA_EXSLB+EX_R3(r13)
113 mfspr r3,SPRN_DAR
114 #ifdef __DISABLED__
115 /* Keep that around for when we re-implement dynamic VSIDs */
116 cmpdi r3,0
117 bge slb_miss_user_pseries
118 #endif /* __DISABLED__ */
119 mfspr r12,SPRN_SRR1
120 #ifndef CONFIG_RELOCATABLE
121 b .slb_miss_realmode
122 #else
123 /*
124 * We can't just use a direct branch to .slb_miss_realmode
125 * because the distance from here to there depends on where
126 * the kernel ends up being put.
127 */
128 mfctr r11
129 ld r10,PACAKBASE(r13)
130 LOAD_HANDLER(r10, .slb_miss_realmode)
131 mtctr r10
132 bctr
133 #endif
135 STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
137 . = 0x480
138 .globl instruction_access_slb_pSeries
139 instruction_access_slb_pSeries:
140 HMT_MEDIUM
141 SET_SCRATCH0(r13)
142 EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
143 std r3,PACA_EXSLB+EX_R3(r13)
144 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
145 #ifdef __DISABLED__
146 /* Keep that around for when we re-implement dynamic VSIDs */
147 cmpdi r3,0
148 bge slb_miss_user_pseries
149 #endif /* __DISABLED__ */
150 mfspr r12,SPRN_SRR1
151 #ifndef CONFIG_RELOCATABLE
152 b .slb_miss_realmode
153 #else
154 mfctr r11
155 ld r10,PACAKBASE(r13)
156 LOAD_HANDLER(r10, .slb_miss_realmode)
157 mtctr r10
158 bctr
159 #endif
161 /* We open code these as we can't have a ". = x" (even with
162 * x = "." within a feature section
163 */
164 . = 0x500;
165 .globl hardware_interrupt_pSeries;
166 .globl hardware_interrupt_hv;
167 hardware_interrupt_pSeries:
168 hardware_interrupt_hv:
169 BEGIN_FTR_SECTION
170 _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
171 EXC_HV, SOFTEN_TEST_HV)
172 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
173 FTR_SECTION_ELSE
174 _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
175 EXC_STD, SOFTEN_TEST_HV_201)
176 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
177 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
179 STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
180 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
182 STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
183 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
185 STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
186 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
188 MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer)
189 MASKABLE_EXCEPTION_HV(0x980, 0x982, decrementer)
191 STD_EXCEPTION_PSERIES(0xa00, 0xa00, trap_0a)
192 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
194 STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
195 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
197 . = 0xc00
198 .globl system_call_pSeries
199 system_call_pSeries:
200 HMT_MEDIUM
201 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
202 SET_SCRATCH0(r13)
203 GET_PACA(r13)
204 std r9,PACA_EXGEN+EX_R9(r13)
205 std r10,PACA_EXGEN+EX_R10(r13)
206 mfcr r9
207 KVMTEST(0xc00)
208 GET_SCRATCH0(r13)
209 #endif
210 BEGIN_FTR_SECTION
211 cmpdi r0,0x1ebe
212 beq- 1f
213 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
214 mr r9,r13
215 GET_PACA(r13)
216 mfspr r11,SPRN_SRR0
217 mfspr r12,SPRN_SRR1
218 ld r10,PACAKBASE(r13)
219 LOAD_HANDLER(r10, system_call_entry)
220 mtspr SPRN_SRR0,r10
221 ld r10,PACAKMSR(r13)
222 mtspr SPRN_SRR1,r10
223 rfid
224 b . /* prevent speculative execution */
226 KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
228 /* Fast LE/BE switch system call */
229 1: mfspr r12,SPRN_SRR1
230 xori r12,r12,MSR_LE
231 mtspr SPRN_SRR1,r12
232 rfid /* return to userspace */
233 b .
235 STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
236 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
238 /* At 0xe??? we have a bunch of hypervisor exceptions, we branch
239 * out of line to handle them
240 */
241 . = 0xe00
242 hv_exception_trampoline:
243 b h_data_storage_hv
244 . = 0xe20
245 b h_instr_storage_hv
246 . = 0xe40
247 b emulation_assist_hv
248 . = 0xe50
249 b hmi_exception_hv
250 . = 0xe60
251 b hmi_exception_hv
253 /* We need to deal with the Altivec unavailable exception
254 * here which is at 0xf20, thus in the middle of the
255 * prolog code of the PerformanceMonitor one. A little
256 * trickery is thus necessary
257 */
258 performance_monitor_pSeries_1:
259 . = 0xf00
260 b performance_monitor_pSeries
262 altivec_unavailable_pSeries_1:
263 . = 0xf20
264 b altivec_unavailable_pSeries
266 vsx_unavailable_pSeries_1:
267 . = 0xf40
268 b vsx_unavailable_pSeries
270 #ifdef CONFIG_CBE_RAS
271 STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
272 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
273 #endif /* CONFIG_CBE_RAS */
275 STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
276 KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
278 #ifdef CONFIG_CBE_RAS
279 STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
280 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
281 #endif /* CONFIG_CBE_RAS */
283 STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
284 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
286 #ifdef CONFIG_CBE_RAS
287 STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
288 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
289 #endif /* CONFIG_CBE_RAS */
291 . = 0x3000
293 /*** Out of line interrupts support ***/
295 /* moved from 0x200 */
296 machine_check_pSeries:
297 .globl machine_check_fwnmi
298 machine_check_fwnmi:
299 HMT_MEDIUM
300 SET_SCRATCH0(r13) /* save r13 */
301 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common,
302 EXC_STD, KVMTEST, 0x200)
303 KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
305 /* moved from 0x300 */
306 data_access_check_stab:
307 GET_PACA(r13)
308 std r9,PACA_EXSLB+EX_R9(r13)
309 std r10,PACA_EXSLB+EX_R10(r13)
310 mfspr r10,SPRN_DAR
311 mfspr r9,SPRN_DSISR
312 srdi r10,r10,60
313 rlwimi r10,r9,16,0x20
314 #ifdef CONFIG_KVM_BOOK3S_PR
315 lbz r9,HSTATE_IN_GUEST(r13)
316 rlwimi r10,r9,8,0x300
317 #endif
318 mfcr r9
319 cmpwi r10,0x2c
320 beq do_stab_bolted_pSeries
321 mtcrf 0x80,r9
322 ld r9,PACA_EXSLB+EX_R9(r13)
323 ld r10,PACA_EXSLB+EX_R10(r13)
324 b data_access_not_stab
325 do_stab_bolted_pSeries:
326 std r11,PACA_EXSLB+EX_R11(r13)
327 std r12,PACA_EXSLB+EX_R12(r13)
328 GET_SCRATCH0(r10)
329 std r10,PACA_EXSLB+EX_R13(r13)
330 EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD)
332 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
333 KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
334 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400)
335 KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480)
336 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900)
337 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
339 .align 7
340 /* moved from 0xe00 */
341 STD_EXCEPTION_HV(., 0xe02, h_data_storage)
342 KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
343 STD_EXCEPTION_HV(., 0xe22, h_instr_storage)
344 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
345 STD_EXCEPTION_HV(., 0xe42, emulation_assist)
346 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
347 STD_EXCEPTION_HV(., 0xe62, hmi_exception) /* need to flush cache ? */
348 KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
350 /* moved from 0xf00 */
351 STD_EXCEPTION_PSERIES(., 0xf00, performance_monitor)
352 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00)
353 STD_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable)
354 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20)
355 STD_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable)
356 KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
358 /*
359 * An interrupt came in while soft-disabled. We set paca->irq_happened,
360 * then, if it was a decrementer interrupt, we bump the dec to max and
361 * and return, else we hard disable and return. This is called with
362 * r10 containing the value to OR to the paca field.
363 */
364 #define MASKED_INTERRUPT(_H) \
365 masked_##_H##interrupt: \
366 std r11,PACA_EXGEN+EX_R11(r13); \
367 lbz r11,PACAIRQHAPPENED(r13); \
368 or r11,r11,r10; \
369 stb r11,PACAIRQHAPPENED(r13); \
370 andi. r10,r10,PACA_IRQ_DEC; \
371 beq 1f; \
372 lis r10,0x7fff; \
373 ori r10,r10,0xffff; \
374 mtspr SPRN_DEC,r10; \
375 b 2f; \
376 1: mfspr r10,SPRN_##_H##SRR1; \
377 rldicl r10,r10,48,1; /* clear MSR_EE */ \
378 rotldi r10,r10,16; \
379 mtspr SPRN_##_H##SRR1,r10; \
380 2: mtcrf 0x80,r9; \
381 ld r9,PACA_EXGEN+EX_R9(r13); \
382 ld r10,PACA_EXGEN+EX_R10(r13); \
383 ld r11,PACA_EXGEN+EX_R11(r13); \
384 GET_SCRATCH0(r13); \
385 ##_H##rfid; \
386 b .
388 MASKED_INTERRUPT()
389 MASKED_INTERRUPT(H)
391 /*
392 * Called from arch_local_irq_enable when an interrupt needs
393 * to be resent. r3 contains 0x500 or 0x900 to indicate which
394 * kind of interrupt. MSR:EE is already off. We generate a
395 * stackframe like if a real interrupt had happened.
396 *
397 * Note: While MSR:EE is off, we need to make sure that _MSR
398 * in the generated frame has EE set to 1 or the exception
399 * handler will not properly re-enable them.
400 */
401 _GLOBAL(__replay_interrupt)
402 /* We are going to jump to the exception common code which
403 * will retrieve various register values from the PACA which
404 * we don't give a damn about, so we don't bother storing them.
405 */
406 mfmsr r12
407 mflr r11
408 mfcr r9
409 ori r12,r12,MSR_EE
410 andi. r3,r3,0x0800
411 bne decrementer_common
412 b hardware_interrupt_common
414 #ifdef CONFIG_PPC_PSERIES
415 /*
416 * Vectors for the FWNMI option. Share common code.
417 */
418 .globl system_reset_fwnmi
419 .align 7
420 system_reset_fwnmi:
421 HMT_MEDIUM
422 SET_SCRATCH0(r13) /* save r13 */
423 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
424 NOTEST, 0x100)
426 #endif /* CONFIG_PPC_PSERIES */
428 #ifdef __DISABLED__
429 /*
430 * This is used for when the SLB miss handler has to go virtual,
431 * which doesn't happen for now anymore but will once we re-implement
432 * dynamic VSIDs for shared page tables
433 */
434 slb_miss_user_pseries:
435 std r10,PACA_EXGEN+EX_R10(r13)
436 std r11,PACA_EXGEN+EX_R11(r13)
437 std r12,PACA_EXGEN+EX_R12(r13)
438 GET_SCRATCH0(r10)
439 ld r11,PACA_EXSLB+EX_R9(r13)
440 ld r12,PACA_EXSLB+EX_R3(r13)
441 std r10,PACA_EXGEN+EX_R13(r13)
442 std r11,PACA_EXGEN+EX_R9(r13)
443 std r12,PACA_EXGEN+EX_R3(r13)
444 clrrdi r12,r13,32
445 mfmsr r10
446 mfspr r11,SRR0 /* save SRR0 */
447 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
448 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
449 mtspr SRR0,r12
450 mfspr r12,SRR1 /* and SRR1 */
451 mtspr SRR1,r10
452 rfid
453 b . /* prevent spec. execution */
454 #endif /* __DISABLED__ */
456 .align 7
457 .globl __end_interrupts
458 __end_interrupts:
460 /*
461 * Code from here down to __end_handlers is invoked from the
462 * exception prologs above. Because the prologs assemble the
463 * addresses of these handlers using the LOAD_HANDLER macro,
464 * which uses an addi instruction, these handlers must be in
465 * the first 32k of the kernel image.
466 */
468 /*** Common interrupt handlers ***/
470 STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
472 /*
473 * Machine check is different because we use a different
474 * save area: PACA_EXMC instead of PACA_EXGEN.
475 */
476 .align 7
477 .globl machine_check_common
478 machine_check_common:
479 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
480 FINISH_NAP
481 DISABLE_INTS
482 bl .save_nvgprs
483 addi r3,r1,STACK_FRAME_OVERHEAD
484 bl .machine_check_exception
485 b .ret_from_except
487 STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
488 STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt)
489 STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception)
490 STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
491 STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
492 STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
493 STD_EXCEPTION_COMMON(0xe40, emulation_assist, .program_check_exception)
494 STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception)
495 STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception)
496 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
497 #ifdef CONFIG_ALTIVEC
498 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
499 #else
500 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
501 #endif
502 #ifdef CONFIG_CBE_RAS
503 STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception)
504 STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception)
505 STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception)
506 #endif /* CONFIG_CBE_RAS */
508 .align 7
509 system_call_entry:
510 b system_call_common
512 ppc64_runlatch_on_trampoline:
513 b .__ppc64_runlatch_on
515 /*
516 * Here we have detected that the kernel stack pointer is bad.
517 * R9 contains the saved CR, r13 points to the paca,
518 * r10 contains the (bad) kernel stack pointer,
519 * r11 and r12 contain the saved SRR0 and SRR1.
520 * We switch to using an emergency stack, save the registers there,
521 * and call kernel_bad_stack(), which panics.
522 */
523 bad_stack:
524 ld r1,PACAEMERGSP(r13)
525 subi r1,r1,64+INT_FRAME_SIZE
526 std r9,_CCR(r1)
527 std r10,GPR1(r1)
528 std r11,_NIP(r1)
529 std r12,_MSR(r1)
530 mfspr r11,SPRN_DAR
531 mfspr r12,SPRN_DSISR
532 std r11,_DAR(r1)
533 std r12,_DSISR(r1)
534 mflr r10
535 mfctr r11
536 mfxer r12
537 std r10,_LINK(r1)
538 std r11,_CTR(r1)
539 std r12,_XER(r1)
540 SAVE_GPR(0,r1)
541 SAVE_GPR(2,r1)
542 ld r10,EX_R3(r3)
543 std r10,GPR3(r1)
544 SAVE_GPR(4,r1)
545 SAVE_4GPRS(5,r1)
546 ld r9,EX_R9(r3)
547 ld r10,EX_R10(r3)
548 SAVE_2GPRS(9,r1)
549 ld r9,EX_R11(r3)
550 ld r10,EX_R12(r3)
551 ld r11,EX_R13(r3)
552 std r9,GPR11(r1)
553 std r10,GPR12(r1)
554 std r11,GPR13(r1)
555 BEGIN_FTR_SECTION
556 ld r10,EX_CFAR(r3)
557 std r10,ORIG_GPR3(r1)
558 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
559 SAVE_8GPRS(14,r1)
560 SAVE_10GPRS(22,r1)
561 lhz r12,PACA_TRAP_SAVE(r13)
562 std r12,_TRAP(r1)
563 addi r11,r1,INT_FRAME_SIZE
564 std r11,0(r1)
565 li r12,0
566 std r12,0(r11)
567 ld r2,PACATOC(r13)
568 ld r11,exception_marker@toc(r2)
569 std r12,RESULT(r1)
570 std r11,STACK_FRAME_OVERHEAD-16(r1)
571 1: addi r3,r1,STACK_FRAME_OVERHEAD
572 bl .kernel_bad_stack
573 b 1b
575 /*
576 * Here r13 points to the paca, r9 contains the saved CR,
577 * SRR0 and SRR1 are saved in r11 and r12,
578 * r9 - r13 are saved in paca->exgen.
579 */
580 .align 7
581 .globl data_access_common
582 data_access_common:
583 mfspr r10,SPRN_DAR
584 std r10,PACA_EXGEN+EX_DAR(r13)
585 mfspr r10,SPRN_DSISR
586 stw r10,PACA_EXGEN+EX_DSISR(r13)
587 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
588 DISABLE_INTS
589 ld r12,_MSR(r1)
590 ld r3,PACA_EXGEN+EX_DAR(r13)
591 lwz r4,PACA_EXGEN+EX_DSISR(r13)
592 li r5,0x300
593 b .do_hash_page /* Try to handle as hpte fault */
595 .align 7
596 .globl h_data_storage_common
597 h_data_storage_common:
598 mfspr r10,SPRN_HDAR
599 std r10,PACA_EXGEN+EX_DAR(r13)
600 mfspr r10,SPRN_HDSISR
601 stw r10,PACA_EXGEN+EX_DSISR(r13)
602 EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
603 bl .save_nvgprs
604 DISABLE_INTS
605 addi r3,r1,STACK_FRAME_OVERHEAD
606 bl .unknown_exception
607 b .ret_from_except
609 .align 7
610 .globl instruction_access_common
611 instruction_access_common:
612 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
613 DISABLE_INTS
614 ld r12,_MSR(r1)
615 ld r3,_NIP(r1)
616 andis. r4,r12,0x5820
617 li r5,0x400
618 b .do_hash_page /* Try to handle as hpte fault */
620 STD_EXCEPTION_COMMON(0xe20, h_instr_storage, .unknown_exception)
622 /*
623 * Here is the common SLB miss user that is used when going to virtual
624 * mode for SLB misses, that is currently not used
625 */
626 #ifdef __DISABLED__
627 .align 7
628 .globl slb_miss_user_common
629 slb_miss_user_common:
630 mflr r10
631 std r3,PACA_EXGEN+EX_DAR(r13)
632 stw r9,PACA_EXGEN+EX_CCR(r13)
633 std r10,PACA_EXGEN+EX_LR(r13)
634 std r11,PACA_EXGEN+EX_SRR0(r13)
635 bl .slb_allocate_user
637 ld r10,PACA_EXGEN+EX_LR(r13)
638 ld r3,PACA_EXGEN+EX_R3(r13)
639 lwz r9,PACA_EXGEN+EX_CCR(r13)
640 ld r11,PACA_EXGEN+EX_SRR0(r13)
641 mtlr r10
642 beq- slb_miss_fault
644 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
645 beq- unrecov_user_slb
646 mfmsr r10
648 .machine push
649 .machine "power4"
650 mtcrf 0x80,r9
651 .machine pop
653 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
654 mtmsrd r10,1
656 mtspr SRR0,r11
657 mtspr SRR1,r12
659 ld r9,PACA_EXGEN+EX_R9(r13)
660 ld r10,PACA_EXGEN+EX_R10(r13)
661 ld r11,PACA_EXGEN+EX_R11(r13)
662 ld r12,PACA_EXGEN+EX_R12(r13)
663 ld r13,PACA_EXGEN+EX_R13(r13)
664 rfid
665 b .
667 slb_miss_fault:
668 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
669 ld r4,PACA_EXGEN+EX_DAR(r13)
670 li r5,0
671 std r4,_DAR(r1)
672 std r5,_DSISR(r1)
673 b handle_page_fault
675 unrecov_user_slb:
676 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
677 DISABLE_INTS
678 bl .save_nvgprs
679 1: addi r3,r1,STACK_FRAME_OVERHEAD
680 bl .unrecoverable_exception
681 b 1b
683 #endif /* __DISABLED__ */
686 /*
687 * r13 points to the PACA, r9 contains the saved CR,
688 * r12 contain the saved SRR1, SRR0 is still ready for return
689 * r3 has the faulting address
690 * r9 - r13 are saved in paca->exslb.
691 * r3 is saved in paca->slb_r3
692 * We assume we aren't going to take any exceptions during this procedure.
693 */
694 _GLOBAL(slb_miss_realmode)
695 mflr r10
696 #ifdef CONFIG_RELOCATABLE
697 mtctr r11
698 #endif
700 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
701 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
703 bl .slb_allocate_realmode
705 /* All done -- return from exception. */
707 ld r10,PACA_EXSLB+EX_LR(r13)
708 ld r3,PACA_EXSLB+EX_R3(r13)
709 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
711 mtlr r10
713 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
714 beq- 2f
716 .machine push
717 .machine "power4"
718 mtcrf 0x80,r9
719 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
720 .machine pop
722 ld r9,PACA_EXSLB+EX_R9(r13)
723 ld r10,PACA_EXSLB+EX_R10(r13)
724 ld r11,PACA_EXSLB+EX_R11(r13)
725 ld r12,PACA_EXSLB+EX_R12(r13)
726 ld r13,PACA_EXSLB+EX_R13(r13)
727 rfid
728 b . /* prevent speculative execution */
730 2: mfspr r11,SPRN_SRR0
731 ld r10,PACAKBASE(r13)
732 LOAD_HANDLER(r10,unrecov_slb)
733 mtspr SPRN_SRR0,r10
734 ld r10,PACAKMSR(r13)
735 mtspr SPRN_SRR1,r10
736 rfid
737 b .
739 unrecov_slb:
740 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
741 DISABLE_INTS
742 bl .save_nvgprs
743 1: addi r3,r1,STACK_FRAME_OVERHEAD
744 bl .unrecoverable_exception
745 b 1b
748 #ifdef CONFIG_PPC_970_NAP
749 power4_fixup_nap:
750 andc r9,r9,r10
751 std r9,TI_LOCAL_FLAGS(r11)
752 ld r10,_LINK(r1) /* make idle task do the */
753 std r10,_NIP(r1) /* equivalent of a blr */
754 blr
755 #endif
757 .align 7
758 .globl alignment_common
759 alignment_common:
760 mfspr r10,SPRN_DAR
761 std r10,PACA_EXGEN+EX_DAR(r13)
762 mfspr r10,SPRN_DSISR
763 stw r10,PACA_EXGEN+EX_DSISR(r13)
764 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
765 ld r3,PACA_EXGEN+EX_DAR(r13)
766 lwz r4,PACA_EXGEN+EX_DSISR(r13)
767 std r3,_DAR(r1)
768 std r4,_DSISR(r1)
769 bl .save_nvgprs
770 DISABLE_INTS
771 addi r3,r1,STACK_FRAME_OVERHEAD
772 bl .alignment_exception
773 b .ret_from_except
775 .align 7
776 .globl program_check_common
777 program_check_common:
778 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
779 bl .save_nvgprs
780 DISABLE_INTS
781 addi r3,r1,STACK_FRAME_OVERHEAD
782 bl .program_check_exception
783 b .ret_from_except
785 .align 7
786 .globl fp_unavailable_common
787 fp_unavailable_common:
788 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
789 bne 1f /* if from user, just load it up */
790 bl .save_nvgprs
791 DISABLE_INTS
792 addi r3,r1,STACK_FRAME_OVERHEAD
793 bl .kernel_fp_unavailable_exception
794 BUG_OPCODE
795 1: bl .load_up_fpu
796 b fast_exception_return
798 .align 7
799 .globl altivec_unavailable_common
800 altivec_unavailable_common:
801 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
802 #ifdef CONFIG_ALTIVEC
803 BEGIN_FTR_SECTION
804 beq 1f
805 bl .load_up_altivec
806 b fast_exception_return
807 1:
808 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
809 #endif
810 bl .save_nvgprs
811 DISABLE_INTS
812 addi r3,r1,STACK_FRAME_OVERHEAD
813 bl .altivec_unavailable_exception
814 b .ret_from_except
816 .align 7
817 .globl vsx_unavailable_common
818 vsx_unavailable_common:
819 EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
820 #ifdef CONFIG_VSX
821 BEGIN_FTR_SECTION
822 beq 1f
823 b .load_up_vsx
824 1:
825 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
826 #endif
827 bl .save_nvgprs
828 DISABLE_INTS
829 addi r3,r1,STACK_FRAME_OVERHEAD
830 bl .vsx_unavailable_exception
831 b .ret_from_except
833 .align 7
834 .globl __end_handlers
835 __end_handlers:
837 /*
838 * Hash table stuff
839 */
840 .align 7
841 _STATIC(do_hash_page)
842 std r3,_DAR(r1)
843 std r4,_DSISR(r1)
845 andis. r0,r4,0xa410 /* weird error? */
846 bne- handle_page_fault /* if not, try to insert a HPTE */
847 andis. r0,r4,DSISR_DABRMATCH@h
848 bne- handle_dabr_fault
850 BEGIN_FTR_SECTION
851 andis. r0,r4,0x0020 /* Is it a segment table fault? */
852 bne- do_ste_alloc /* If so handle it */
853 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
855 CURRENT_THREAD_INFO(r11, r1)
856 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
857 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
858 bne 77f /* then don't call hash_page now */
859 /*
860 * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
861 * accessing a userspace segment (even from the kernel). We assume
862 * kernel addresses always have the high bit set.
863 */
864 rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
865 rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
866 orc r0,r12,r0 /* MSR_PR | ~high_bit */
867 rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
868 ori r4,r4,1 /* add _PAGE_PRESENT */
869 rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
871 /*
872 * r3 contains the faulting address
873 * r4 contains the required access permissions
874 * r5 contains the trap number
875 *
876 * at return r3 = 0 for success, 1 for page fault, negative for error
877 */
878 bl .hash_page /* build HPTE if possible */
879 cmpdi r3,0 /* see if hash_page succeeded */
881 /* Success */
882 beq fast_exc_return_irq /* Return from exception on success */
884 /* Error */
885 blt- 13f
887 /* Here we have a page fault that hash_page can't handle. */
888 handle_page_fault:
889 11: ld r4,_DAR(r1)
890 ld r5,_DSISR(r1)
891 addi r3,r1,STACK_FRAME_OVERHEAD
892 bl .do_page_fault
893 cmpdi r3,0
894 beq+ 12f
895 bl .save_nvgprs
896 mr r5,r3
897 addi r3,r1,STACK_FRAME_OVERHEAD
898 lwz r4,_DAR(r1)
899 bl .bad_page_fault
900 b .ret_from_except
902 /* We have a data breakpoint exception - handle it */
903 handle_dabr_fault:
904 bl .save_nvgprs
905 ld r4,_DAR(r1)
906 ld r5,_DSISR(r1)
907 addi r3,r1,STACK_FRAME_OVERHEAD
908 bl .do_dabr
909 12: b .ret_from_except_lite
912 /* We have a page fault that hash_page could handle but HV refused
913 * the PTE insertion
914 */
915 13: bl .save_nvgprs
916 mr r5,r3
917 addi r3,r1,STACK_FRAME_OVERHEAD
918 ld r4,_DAR(r1)
919 bl .low_hash_fault
920 b .ret_from_except
922 /*
923 * We come here as a result of a DSI at a point where we don't want
924 * to call hash_page, such as when we are accessing memory (possibly
925 * user memory) inside a PMU interrupt that occurred while interrupts
926 * were soft-disabled. We want to invoke the exception handler for
927 * the access, or panic if there isn't a handler.
928 */
929 77: bl .save_nvgprs
930 mr r4,r3
931 addi r3,r1,STACK_FRAME_OVERHEAD
932 li r5,SIGSEGV
933 bl .bad_page_fault
934 b .ret_from_except
936 /* here we have a segment miss */
937 do_ste_alloc:
938 bl .ste_allocate /* try to insert stab entry */
939 cmpdi r3,0
940 bne- handle_page_fault
941 b fast_exception_return
943 /*
944 * r13 points to the PACA, r9 contains the saved CR,
945 * r11 and r12 contain the saved SRR0 and SRR1.
946 * r9 - r13 are saved in paca->exslb.
947 * We assume we aren't going to take any exceptions during this procedure.
948 * We assume (DAR >> 60) == 0xc.
949 */
950 .align 7
951 _GLOBAL(do_stab_bolted)
952 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
953 std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */
955 /* Hash to the primary group */
956 ld r10,PACASTABVIRT(r13)
957 mfspr r11,SPRN_DAR
958 srdi r11,r11,28
959 rldimi r10,r11,7,52 /* r10 = first ste of the group */
961 /* Calculate VSID */
962 /* This is a kernel address, so protovsid = ESID */
963 ASM_VSID_SCRAMBLE(r11, r9, 256M)
964 rldic r9,r11,12,16 /* r9 = vsid << 12 */
966 /* Search the primary group for a free entry */
967 1: ld r11,0(r10) /* Test valid bit of the current ste */
968 andi. r11,r11,0x80
969 beq 2f
970 addi r10,r10,16
971 andi. r11,r10,0x70
972 bne 1b
974 /* Stick for only searching the primary group for now. */
975 /* At least for now, we use a very simple random castout scheme */
976 /* Use the TB as a random number ; OR in 1 to avoid entry 0 */
977 mftb r11
978 rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */
979 ori r11,r11,0x10
981 /* r10 currently points to an ste one past the group of interest */
982 /* make it point to the randomly selected entry */
983 subi r10,r10,128
984 or r10,r10,r11 /* r10 is the entry to invalidate */
986 isync /* mark the entry invalid */
987 ld r11,0(r10)
988 rldicl r11,r11,56,1 /* clear the valid bit */
989 rotldi r11,r11,8
990 std r11,0(r10)
991 sync
993 clrrdi r11,r11,28 /* Get the esid part of the ste */
994 slbie r11
996 2: std r9,8(r10) /* Store the vsid part of the ste */
997 eieio
999 mfspr r11,SPRN_DAR /* Get the new esid */
1000 clrrdi r11,r11,28 /* Permits a full 32b of ESID */
1001 ori r11,r11,0x90 /* Turn on valid and kp */
1002 std r11,0(r10) /* Put new entry back into the stab */
1004 sync
1006 /* All done -- return from exception. */
1007 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1008 ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */
1010 andi. r10,r12,MSR_RI
1011 beq- unrecov_slb
1013 mtcrf 0x80,r9 /* restore CR */
1015 mfmsr r10
1016 clrrdi r10,r10,2
1017 mtmsrd r10,1
1019 mtspr SPRN_SRR0,r11
1020 mtspr SPRN_SRR1,r12
1021 ld r9,PACA_EXSLB+EX_R9(r13)
1022 ld r10,PACA_EXSLB+EX_R10(r13)
1023 ld r11,PACA_EXSLB+EX_R11(r13)
1024 ld r12,PACA_EXSLB+EX_R12(r13)
1025 ld r13,PACA_EXSLB+EX_R13(r13)
1026 rfid
1027 b . /* prevent speculative execution */
1029 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
1030 /*
1031 * Data area reserved for FWNMI option.
1032 * This address (0x7000) is fixed by the RPA.
1033 */
1034 .= 0x7000
1035 .globl fwnmi_data_area
1036 fwnmi_data_area:
1038 /* pseries and powernv need to keep the whole page from
1039 * 0x7000 to 0x8000 free for use by the firmware
1040 */
1041 . = 0x8000
1042 #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1044 /* Space for CPU0's segment table */
1045 .balign 4096
1046 .globl initial_stab
1047 initial_stab:
1048 .space 4096
1050 #ifdef CONFIG_PPC_POWERNV
1051 _GLOBAL(opal_mc_secondary_handler)
1052 HMT_MEDIUM
1053 SET_SCRATCH0(r13)
1054 GET_PACA(r13)
1055 clrldi r3,r3,2
1056 tovirt(r3,r3)
1057 std r3,PACA_OPAL_MC_EVT(r13)
1058 ld r13,OPAL_MC_SRR0(r3)
1059 mtspr SPRN_SRR0,r13
1060 ld r13,OPAL_MC_SRR1(r3)
1061 mtspr SPRN_SRR1,r13
1062 ld r3,OPAL_MC_GPR3(r3)
1063 GET_SCRATCH0(r13)
1064 b machine_check_pSeries
1065 #endif /* CONFIG_PPC_POWERNV */