1 #ifndef _ASM_POWERPC_EXCEPTION_H
2 #define _ASM_POWERPC_EXCEPTION_H
4 * Extracted from head_64.S
7 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
9 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
10 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
11 * Adapted for Power Macintosh by Paul Mackerras.
12 * Low-level exception handlers and MMU support
13 * rewritten by Paul Mackerras.
14 * Copyright (C) 1996 Paul Mackerras.
16 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
17 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
19 * This file contains the low-level support and setup for the
20 * PowerPC-64 platform, including trap and interrupt dispatch.
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
28 * The following macros define the code that appears as
29 * the prologue to each of the exception handlers. They
30 * are split into two parts to allow a single kernel binary
31 * to be used for pSeries and iSeries.
33 * We make as much of the exception code common between native
34 * exception handlers (including pSeries LPAR) and iSeries LPAR
35 * implementations as possible.
37 #include <asm/head-64.h>
51 #define EX_PPR 88 /* SMT thread status register (priority) */
54 #ifdef CONFIG_RELOCATABLE
55 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
56 mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
57 LOAD_HANDLER(r12,label); \
59 mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
61 mtmsrd r10,1; /* Set RI (EE=0) */ \
64 /* If not relocatable, we can jump directly -- and save messing with LR */
65 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
66 mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
67 mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
69 mtmsrd r10,1; /* Set RI (EE=0) */ \
72 #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
73 __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
76 * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
77 * so no need to rfid. Save lr in case we're CONFIG_RELOCATABLE, in which
78 * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
80 #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec) \
81 EXCEPTION_PROLOG_0(area); \
82 EXCEPTION_PROLOG_1(area, extra, vec); \
83 EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
86 * We're short on space and time in the exception prolog, so we can't
87 * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
88 * Instead we get the base of the kernel from paca->kernelbase and or in the low
89 * part of label. This requires that the label be within 64KB of kernelbase, and
90 * that kernelbase be 64K aligned.
92 #define LOAD_HANDLER(reg, label) \
93 ld reg,PACAKBASE(r13); /* get high part of &label */ \
94 ori reg,reg,(FIXED_SYMBOL_ABS_ADDR(label))@l;
96 /* Exception register prefixes */
100 #if defined(CONFIG_RELOCATABLE)
102 * If we support interrupts with relocation on AND we're a relocatable kernel,
103 * we need to use CTR to get to the 2nd level handler. So, save/restore it
106 #define SAVE_CTR(reg, area) mfctr reg ; std reg,area+EX_CTR(r13)
107 #define GET_CTR(reg, area) ld reg,area+EX_CTR(r13)
108 #define RESTORE_CTR(reg, area) ld reg,area+EX_CTR(r13) ; mtctr reg
110 /* ...else CTR is unused and in register. */
111 #define SAVE_CTR(reg, area)
112 #define GET_CTR(reg, area) mfctr reg
113 #define RESTORE_CTR(reg, area)
117 * PPR save/restore macros used in exceptions_64s.S
118 * Used for P7 or later processors
120 #define SAVE_PPR(area, ra, rb) \
121 BEGIN_FTR_SECTION_NESTED(940) \
122 ld ra,PACACURRENT(r13); \
123 ld rb,area+EX_PPR(r13); /* Read PPR from paca */ \
124 std rb,TASKTHREADPPR(ra); \
125 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
127 #define RESTORE_PPR_PACA(area, ra) \
128 BEGIN_FTR_SECTION_NESTED(941) \
129 ld ra,area+EX_PPR(r13); \
131 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
134 * Get an SPR into a register if the CPU has the given feature
136 #define OPT_GET_SPR(ra, spr, ftr) \
137 BEGIN_FTR_SECTION_NESTED(943) \
139 END_FTR_SECTION_NESTED(ftr,ftr,943)
142 * Set an SPR from a register if the CPU has the given feature
144 #define OPT_SET_SPR(ra, spr, ftr) \
145 BEGIN_FTR_SECTION_NESTED(943) \
147 END_FTR_SECTION_NESTED(ftr,ftr,943)
150 * Save a register to the PACA if the CPU has the given feature
152 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr) \
153 BEGIN_FTR_SECTION_NESTED(943) \
154 std ra,offset(r13); \
155 END_FTR_SECTION_NESTED(ftr,ftr,943)
157 #define EXCEPTION_PROLOG_0(area) \
159 std r9,area+EX_R9(r13); /* save r9 */ \
160 OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR); \
162 std r10,area+EX_R10(r13); /* save r10 - r12 */ \
163 OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
165 #define __EXCEPTION_PROLOG_1(area, extra, vec) \
166 OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR); \
167 OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR); \
168 SAVE_CTR(r10, area); \
171 std r11,area+EX_R11(r13); \
172 std r12,area+EX_R12(r13); \
174 std r10,area+EX_R13(r13)
175 #define EXCEPTION_PROLOG_1(area, extra, vec) \
176 __EXCEPTION_PROLOG_1(area, extra, vec)
178 #define __EXCEPTION_PROLOG_PSERIES_1(label, h) \
179 ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \
180 mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
181 LOAD_HANDLER(r12,label) \
182 mtspr SPRN_##h##SRR0,r12; \
183 mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
184 mtspr SPRN_##h##SRR1,r10; \
186 b . /* prevent speculative execution */
187 #define EXCEPTION_PROLOG_PSERIES_1(label, h) \
188 __EXCEPTION_PROLOG_PSERIES_1(label, h)
190 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec) \
191 EXCEPTION_PROLOG_0(area); \
192 EXCEPTION_PROLOG_1(area, extra, vec); \
193 EXCEPTION_PROLOG_PSERIES_1(label, h);
195 #define __KVMTEST(h, n) \
196 lbz r10,HSTATE_IN_GUEST(r13); \
200 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
202 * If hv is possible, interrupts come into to the hv version
203 * of the kvmppc_interrupt code, which then jumps to the PR handler,
204 * kvmppc_interrupt_pr, if the guest is a PR guest.
206 #define kvmppc_interrupt kvmppc_interrupt_hv
208 #define kvmppc_interrupt kvmppc_interrupt_pr
211 #define __KVM_HANDLER_PROLOG(area, n) \
212 BEGIN_FTR_SECTION_NESTED(947) \
213 ld r10,area+EX_CFAR(r13); \
214 std r10,HSTATE_CFAR(r13); \
215 END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947); \
216 BEGIN_FTR_SECTION_NESTED(948) \
217 ld r10,area+EX_PPR(r13); \
218 std r10,HSTATE_PPR(r13); \
219 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
220 ld r10,area+EX_R10(r13); \
221 stw r9,HSTATE_SCRATCH1(r13); \
222 ld r9,area+EX_R9(r13); \
223 std r12,HSTATE_SCRATCH0(r13); \
225 #define __KVM_HANDLER(area, h, n) \
226 __KVM_HANDLER_PROLOG(area, n) \
230 #define __KVM_HANDLER_SKIP(area, h, n) \
231 cmpwi r10,KVM_GUEST_MODE_SKIP; \
232 ld r10,area+EX_R10(r13); \
234 stw r9,HSTATE_SCRATCH1(r13); \
235 BEGIN_FTR_SECTION_NESTED(948) \
236 ld r9,area+EX_PPR(r13); \
237 std r9,HSTATE_PPR(r13); \
238 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
239 ld r9,area+EX_R9(r13); \
240 std r12,HSTATE_SCRATCH0(r13); \
242 b kvmppc_interrupt; \
243 89: mtocrf 0x80,r9; \
244 ld r9,area+EX_R9(r13); \
245 b kvmppc_skip_##h##interrupt
247 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
248 #define KVMTEST(h, n) __KVMTEST(h, n)
249 #define KVM_HANDLER(area, h, n) __KVM_HANDLER(area, h, n)
250 #define KVM_HANDLER_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)
253 #define KVMTEST(h, n)
254 #define KVM_HANDLER(area, h, n)
255 #define KVM_HANDLER_SKIP(area, h, n)
261 * The common exception prolog is used for all except a few exceptions
262 * such as a segment miss on a kernel address. We have to be prepared
263 * to take another exception from the point where we first touch the
264 * kernel stack onwards.
266 * On entry r13 points to the paca, r9-r13 are saved in the paca,
267 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
268 * SRR1, and relocation is on.
270 #define EXCEPTION_PROLOG_COMMON(n, area) \
271 andi. r10,r12,MSR_PR; /* See if coming from user */ \
272 mr r10,r1; /* Save r1 */ \
273 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
275 ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
276 1: cmpdi cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace */ \
277 blt+ cr1,3f; /* abort if it is */ \
278 li r1,(n); /* will be reloaded later */ \
279 sth r1,PACA_TRAP_SAVE(r13); \
280 std r3,area+EX_R3(r13); \
281 addi r3,r13,area; /* r3 -> where regs are saved*/ \
282 RESTORE_CTR(r1, area); \
284 3: std r9,_CCR(r1); /* save CR in stackframe */ \
285 std r11,_NIP(r1); /* save SRR0 in stackframe */ \
286 std r12,_MSR(r1); /* save SRR1 in stackframe */ \
287 std r10,0(r1); /* make stack chain pointer */ \
288 std r0,GPR0(r1); /* save r0 in stackframe */ \
289 std r10,GPR1(r1); /* save r1 in stackframe */ \
290 beq 4f; /* if from kernel mode */ \
291 ACCOUNT_CPU_USER_ENTRY(r13, r9, r10); \
292 SAVE_PPR(area, r9, r10); \
293 4: EXCEPTION_PROLOG_COMMON_2(area) \
294 EXCEPTION_PROLOG_COMMON_3(n) \
297 /* Save original regs values from save area to stack frame. */
298 #define EXCEPTION_PROLOG_COMMON_2(area) \
299 ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
300 ld r10,area+EX_R10(r13); \
303 ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
304 ld r10,area+EX_R12(r13); \
305 ld r11,area+EX_R13(r13); \
309 BEGIN_FTR_SECTION_NESTED(66); \
310 ld r10,area+EX_CFAR(r13); \
311 std r10,ORIG_GPR3(r1); \
312 END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \
313 GET_CTR(r10, area); \
316 #define EXCEPTION_PROLOG_COMMON_3(n) \
317 std r2,GPR2(r1); /* save r2 in stackframe */ \
318 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
319 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
320 mflr r9; /* Get LR, later save to stack */ \
321 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
323 lbz r10,PACASOFTIRQEN(r13); \
324 mfspr r11,SPRN_XER; /* save XER in stackframe */ \
328 std r9,_TRAP(r1); /* set trap number */ \
330 ld r11,exception_marker@toc(r2); \
331 std r10,RESULT(r1); /* clear regs->result */ \
332 std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */
337 #define STD_EXCEPTION_PSERIES(vec, label) \
338 SET_SCRATCH0(r13); /* save r13 */ \
339 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label, \
340 EXC_STD, KVMTEST_PR, vec); \
342 /* Version of above for when we have to branch out-of-line */
343 #define __OOL_EXCEPTION(vec, label, hdlr) \
345 EXCEPTION_PROLOG_0(PACA_EXGEN) \
348 #define STD_EXCEPTION_PSERIES_OOL(vec, label) \
349 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec); \
350 EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
352 #define STD_EXCEPTION_HV(loc, vec, label) \
353 SET_SCRATCH0(r13); /* save r13 */ \
354 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label, \
355 EXC_HV, KVMTEST_HV, vec);
357 #define STD_EXCEPTION_HV_OOL(vec, label) \
358 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec); \
359 EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
361 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label) \
362 /* No guest interrupts come through here */ \
363 SET_SCRATCH0(r13); /* save r13 */ \
364 EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
366 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label) \
367 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec); \
368 EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)
370 #define STD_RELON_EXCEPTION_HV(loc, vec, label) \
371 /* No guest interrupts come through here */ \
372 SET_SCRATCH0(r13); /* save r13 */ \
373 EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_HV, NOTEST, vec);
375 #define STD_RELON_EXCEPTION_HV_OOL(vec, label) \
376 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec); \
377 EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
379 /* This associate vector numbers with bits in paca->irq_happened */
380 #define SOFTEN_VALUE_0x500 PACA_IRQ_EE
381 #define SOFTEN_VALUE_0x900 PACA_IRQ_DEC
382 #define SOFTEN_VALUE_0x980 PACA_IRQ_DEC
383 #define SOFTEN_VALUE_0xa00 PACA_IRQ_DBELL
384 #define SOFTEN_VALUE_0xe80 PACA_IRQ_DBELL
385 #define SOFTEN_VALUE_0xe60 PACA_IRQ_HMI
386 #define SOFTEN_VALUE_0xea0 PACA_IRQ_EE
388 #define __SOFTEN_TEST(h, vec) \
389 lbz r10,PACASOFTIRQEN(r13); \
391 li r10,SOFTEN_VALUE_##vec; \
392 beq masked_##h##interrupt
394 #define _SOFTEN_TEST(h, vec) __SOFTEN_TEST(h, vec)
396 #define SOFTEN_TEST_PR(vec) \
397 KVMTEST(EXC_STD, vec); \
398 _SOFTEN_TEST(EXC_STD, vec)
400 #define SOFTEN_TEST_HV(vec) \
401 KVMTEST(EXC_HV, vec); \
402 _SOFTEN_TEST(EXC_HV, vec)
404 #define KVMTEST_PR(vec) \
405 KVMTEST(EXC_STD, vec)
407 #define KVMTEST_HV(vec) \
410 #define SOFTEN_NOTEST_PR(vec) _SOFTEN_TEST(EXC_STD, vec)
411 #define SOFTEN_NOTEST_HV(vec) _SOFTEN_TEST(EXC_HV, vec)
413 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
414 SET_SCRATCH0(r13); /* save r13 */ \
415 EXCEPTION_PROLOG_0(PACA_EXGEN); \
416 __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
417 EXCEPTION_PROLOG_PSERIES_1(label, h);
419 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
420 __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
422 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label) \
423 _MASKABLE_EXCEPTION_PSERIES(vec, label, \
424 EXC_STD, SOFTEN_TEST_PR)
426 #define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label) \
427 EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec); \
428 EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
430 #define MASKABLE_EXCEPTION_HV(loc, vec, label) \
431 _MASKABLE_EXCEPTION_PSERIES(vec, label, \
432 EXC_HV, SOFTEN_TEST_HV)
434 #define MASKABLE_EXCEPTION_HV_OOL(vec, label) \
435 EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec); \
436 EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
438 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
439 SET_SCRATCH0(r13); /* save r13 */ \
440 EXCEPTION_PROLOG_0(PACA_EXGEN); \
441 __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
442 EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
444 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
445 __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)
447 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label) \
448 _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \
449 EXC_STD, SOFTEN_NOTEST_PR)
451 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label) \
452 _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \
453 EXC_HV, SOFTEN_NOTEST_HV)
455 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label) \
456 EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_HV, vec); \
457 EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
460 * Our exception common code can be passed various "additions"
461 * to specify the behaviour of interrupts, whether to kick the
466 * This addition reconciles our actual IRQ state with the various software
467 * flags that track it. This may call C code.
469 #define ADD_RECONCILE RECONCILE_IRQ_STATE(r10,r11)
474 #define RUNLATCH_ON \
476 CURRENT_THREAD_INFO(r3, r1); \
477 ld r4,TI_LOCAL_FLAGS(r3); \
478 andi. r0,r4,_TLF_RUNLATCH; \
479 beql ppc64_runlatch_on_trampoline; \
480 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
482 #define EXCEPTION_COMMON(trap, label, hdlr, ret, additions) \
483 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
484 /* Volatile regs are potentially clobbered here */ \
486 addi r3,r1,STACK_FRAME_OVERHEAD; \
490 #define STD_EXCEPTION_COMMON(trap, label, hdlr) \
491 EXCEPTION_COMMON(trap, label, hdlr, ret_from_except, \
492 ADD_NVGPRS;ADD_RECONCILE)
495 * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
496 * in the idle task and therefore need the special idle handling
497 * (finish nap and runlatch)
499 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr) \
500 EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \
501 FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
504 * When the idle code in power4_idle puts the CPU into NAP mode,
505 * it has to do so in a loop, and relies on the external interrupt
506 * and decrementer interrupt entry code to get it out of the loop.
507 * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
508 * to signal that it is in the loop and needs help to get out.
510 #ifdef CONFIG_PPC_970_NAP
513 CURRENT_THREAD_INFO(r11, r1); \
514 ld r9,TI_LOCAL_FLAGS(r11); \
515 andi. r10,r9,_TLF_NAPPING; \
516 bnel power4_fixup_nap; \
517 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
522 #endif /* _ASM_POWERPC_EXCEPTION_H */