2 /* $NetBSD: trap_subr.S,v 1.20 2002/04/22 23:20:08 kleink Exp $ */
5 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
6 * Copyright (C) 1995, 1996 TooLs GmbH.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by TooLs GmbH.
20 * 4. The name of TooLs GmbH may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * NOTICE: This is not a standalone file. to use it, #include it in
37 * your port's locore.S, like so:
39 * #include <powerpc/aim/trap_subr.S>
43 * Save/restore segment registers
45 #define RESTORE_SRS(pmap,sr) mtsr 0,sr; \
46 lwz sr,1*4(pmap); mtsr 1,sr; \
47 lwz sr,2*4(pmap); mtsr 2,sr; \
48 lwz sr,3*4(pmap); mtsr 3,sr; \
49 lwz sr,4*4(pmap); mtsr 4,sr; \
50 lwz sr,5*4(pmap); mtsr 5,sr; \
51 lwz sr,6*4(pmap); mtsr 6,sr; \
52 lwz sr,7*4(pmap); mtsr 7,sr; \
53 lwz sr,8*4(pmap); mtsr 8,sr; \
54 lwz sr,9*4(pmap); mtsr 9,sr; \
55 lwz sr,10*4(pmap); mtsr 10,sr; \
56 lwz sr,11*4(pmap); mtsr 11,sr; \
57 /* Skip segment 12 (USER_SR), which is restored differently */ \
58 lwz sr,13*4(pmap); mtsr 13,sr; \
59 lwz sr,14*4(pmap); mtsr 14,sr; \
60 lwz sr,15*4(pmap); mtsr 15,sr; isync;
63 * User SRs are loaded through a pointer to the current pmap.
65 #define RESTORE_USER_SRS(pmap,sr) \
67 lwz pmap,PC_CURPMAP(pmap); \
68 lwzu sr,PM_SR(pmap); \
69 RESTORE_SRS(pmap,sr) \
71 lwz sr,12*4(pmap); mtsr 12,sr; isync
74 * Kernel SRs are loaded directly from kernel_pmap_
76 #define RESTORE_KERN_SRS(pmap,sr) \
77 lwz pmap,TRAP_TOCBASE(0); \
78 lwz pmap,CNAME(kernel_pmap_store)@got(pmap); \
79 lwzu sr,PM_SR(pmap); \
83 * FRAME_SETUP assumes:
86 * savearea r28-r31,DAR,DSISR (DAR & DSISR only for DSI traps)
92 * SRR0/1 as at start of trap
94 #define FRAME_SETUP(savearea) \
95 /* Have to enable translation to allow access of kernel stack: */ \
98 stw %r30,(savearea+CPUSAVE_SRR0)(%r31); /* save SRR0 */ \
100 stw %r30,(savearea+CPUSAVE_SRR1)(%r31); /* save SRR1 */ \
102 ori %r30,%r30,(PSL_DR|PSL_IR|PSL_RI)@l; /* relocation on */ \
103 mtmsr %r30; /* stack can now be accessed */ \
105 mfsprg1 %r31; /* get saved SP */ \
106 stwu %r31,-FRAMELEN(%r1); /* save it in the callframe */ \
107 stw %r0, FRAME_0+8(%r1); /* save r0 in the trapframe */ \
108 stw %r31,FRAME_1+8(%r1); /* save SP " " */ \
109 stw %r2, FRAME_2+8(%r1); /* save r2 " " */ \
110 stw %r28,FRAME_LR+8(%r1); /* save LR " " */ \
111 stw %r29,FRAME_CR+8(%r1); /* save CR " " */ \
113 lwz %r28,(savearea+CPUSAVE_R28)(%r2); /* get saved r28 */ \
114 lwz %r29,(savearea+CPUSAVE_R29)(%r2); /* get saved r29 */ \
115 lwz %r30,(savearea+CPUSAVE_R30)(%r2); /* get saved r30 */ \
116 lwz %r31,(savearea+CPUSAVE_R31)(%r2); /* get saved r31 */ \
117 stw %r3, FRAME_3+8(%r1); /* save r3-r31 */ \
118 stw %r4, FRAME_4+8(%r1); \
119 stw %r5, FRAME_5+8(%r1); \
120 stw %r6, FRAME_6+8(%r1); \
121 stw %r7, FRAME_7+8(%r1); \
122 stw %r8, FRAME_8+8(%r1); \
123 stw %r9, FRAME_9+8(%r1); \
124 stw %r10, FRAME_10+8(%r1); \
125 stw %r11, FRAME_11+8(%r1); \
126 stw %r12, FRAME_12+8(%r1); \
127 stw %r13, FRAME_13+8(%r1); \
128 stw %r14, FRAME_14+8(%r1); \
129 stw %r15, FRAME_15+8(%r1); \
130 stw %r16, FRAME_16+8(%r1); \
131 stw %r17, FRAME_17+8(%r1); \
132 stw %r18, FRAME_18+8(%r1); \
133 stw %r19, FRAME_19+8(%r1); \
134 stw %r20, FRAME_20+8(%r1); \
135 stw %r21, FRAME_21+8(%r1); \
136 stw %r22, FRAME_22+8(%r1); \
137 stw %r23, FRAME_23+8(%r1); \
138 stw %r24, FRAME_24+8(%r1); \
139 stw %r25, FRAME_25+8(%r1); \
140 stw %r26, FRAME_26+8(%r1); \
141 stw %r27, FRAME_27+8(%r1); \
142 stw %r28, FRAME_28+8(%r1); \
143 stw %r29, FRAME_29+8(%r1); \
144 stw %r30, FRAME_30+8(%r1); \
145 stw %r31, FRAME_31+8(%r1); \
146 lwz %r28,(savearea+CPUSAVE_AIM_DAR)(%r2); /* saved DAR */ \
147 lwz %r29,(savearea+CPUSAVE_AIM_DSISR)(%r2);/* saved DSISR */\
148 lwz %r30,(savearea+CPUSAVE_SRR0)(%r2); /* saved SRR0 */ \
149 lwz %r31,(savearea+CPUSAVE_SRR1)(%r2); /* saved SRR1 */ \
153 stw %r3, FRAME_XER+8(1); /* save xer/ctr/exc */ \
154 stw %r4, FRAME_CTR+8(1); \
155 stw %r5, FRAME_EXC+8(1); \
156 stw %r28,FRAME_AIM_DAR+8(1); \
157 stw %r29,FRAME_AIM_DSISR+8(1); /* save dsisr/srr0/srr1 */ \
158 stw %r30,FRAME_SRR0+8(1); \
159 stw %r31,FRAME_SRR1+8(1); \
160 lwz %r2,PC_CURTHREAD(%r2) /* set curthread pointer */
162 #define FRAME_LEAVE(savearea) \
163 /* Disable exceptions: */ \
165 andi. %r2,%r2,~PSL_EE@l; \
168 /* Now restore regs: */ \
169 lwz %r2,FRAME_SRR0+8(%r1); \
170 lwz %r3,FRAME_SRR1+8(%r1); \
171 lwz %r4,FRAME_CTR+8(%r1); \
172 lwz %r5,FRAME_XER+8(%r1); \
173 lwz %r6,FRAME_LR+8(%r1); \
175 stw %r2,(savearea+CPUSAVE_SRR0)(%r7); /* save SRR0 */ \
176 stw %r3,(savearea+CPUSAVE_SRR1)(%r7); /* save SRR1 */ \
177 lwz %r7,FRAME_CR+8(%r1); \
181 mtsprg1 %r7; /* save cr */ \
182 lwz %r31,FRAME_31+8(%r1); /* restore r0-31 */ \
183 lwz %r30,FRAME_30+8(%r1); \
184 lwz %r29,FRAME_29+8(%r1); \
185 lwz %r28,FRAME_28+8(%r1); \
186 lwz %r27,FRAME_27+8(%r1); \
187 lwz %r26,FRAME_26+8(%r1); \
188 lwz %r25,FRAME_25+8(%r1); \
189 lwz %r24,FRAME_24+8(%r1); \
190 lwz %r23,FRAME_23+8(%r1); \
191 lwz %r22,FRAME_22+8(%r1); \
192 lwz %r21,FRAME_21+8(%r1); \
193 lwz %r20,FRAME_20+8(%r1); \
194 lwz %r19,FRAME_19+8(%r1); \
195 lwz %r18,FRAME_18+8(%r1); \
196 lwz %r17,FRAME_17+8(%r1); \
197 lwz %r16,FRAME_16+8(%r1); \
198 lwz %r15,FRAME_15+8(%r1); \
199 lwz %r14,FRAME_14+8(%r1); \
200 lwz %r13,FRAME_13+8(%r1); \
201 lwz %r12,FRAME_12+8(%r1); \
202 lwz %r11,FRAME_11+8(%r1); \
203 lwz %r10,FRAME_10+8(%r1); \
204 lwz %r9, FRAME_9+8(%r1); \
205 lwz %r8, FRAME_8+8(%r1); \
206 lwz %r7, FRAME_7+8(%r1); \
207 lwz %r6, FRAME_6+8(%r1); \
208 lwz %r5, FRAME_5+8(%r1); \
209 lwz %r4, FRAME_4+8(%r1); \
210 lwz %r3, FRAME_3+8(%r1); \
211 lwz %r2, FRAME_2+8(%r1); \
212 lwz %r0, FRAME_0+8(%r1); \
213 lwz %r1, FRAME_1+8(%r1); \
214 /* Can't touch %r1 from here on */ \
215 mtsprg2 %r2; /* save r2 & r3 */ \
217 /* Disable translation, machine check and recoverability: */ \
219 andi. %r2,%r2,~(PSL_DR|PSL_IR|PSL_ME|PSL_RI)@l; \
222 /* Decide whether we return to user mode: */ \
224 lwz %r3,(savearea+CPUSAVE_SRR1)(%r2); \
226 bf 17,1f; /* branch if PSL_PR is false */ \
227 /* Restore user SRs */ \
228 RESTORE_USER_SRS(%r2,%r3); \
229 1: mfsprg1 %r2; /* restore cr */ \
232 lwz %r3,(savearea+CPUSAVE_SRR0)(%r2); /* restore srr0 */ \
234 lwz %r3,(savearea+CPUSAVE_SRR1)(%r2); /* restore srr1 */ \
236 /* Make sure HV bit of MSR propagated to SRR1 */ \
241 mfsprg2 %r2; /* restore r2 & r3 */ \
246 .globl dtrace_invop_calltrap_addr
248 .type dtrace_invop_calltrap_addr, @object
249 .size dtrace_invop_calltrap_addr, 4
250 dtrace_invop_calltrap_addr:
258 * The next two routines are 64-bit glue code. The first is used to test if
259 * we are on a 64-bit system. By copying it to the illegal instruction
260 * handler, we can test for 64-bit mode by trying to execute a 64-bit
261 * instruction and seeing what happens. The second gets copied in front
262 * of all the other handlers to restore 32-bit bridge mode when traps
266 /* 64-bit test code. Sets SPRG2 to 0 if an illegal instruction is executed */
268 .globl CNAME(testppc64),CNAME(testppc64size)
280 CNAME(testppc64size) = .-CNAME(testppc64)
283 /* 64-bit bridge mode restore snippet. Gets copied in front of everything else
284 * on 64-bit systems. */
286 .globl CNAME(restorebridge),CNAME(restorebridgesize)
287 CNAME(restorebridge):
294 CNAME(restorebridgesize) = .-CNAME(restorebridge)
297 * Processor reset exception handler. These are typically
298 * the first instructions the processor executes after a
299 * software reset. We do this in two bits so that we are
300 * not still hanging around in the trap handling region
301 * once the MMU is turned on.
303 .globl CNAME(rstcode), CNAME(rstcodeend)
305 lwz %r31, TRAP_GENTRAP(0)
306 addi %r31, %r31, (cpu_reset - generictrap)
318 addi %r1,%r1,(124-16)@l
320 bl CNAME(cpudep_ap_early_bootstrap)
322 bl CNAME(pmap_cpu_bootstrap)
323 bl CNAME(cpudep_ap_bootstrap)
325 bl CNAME(cpudep_ap_setup)
327 lwz %r3,(PC_RESTORE)(%r5)
334 bl CNAME(machdep_ap_bootstrap)
337 /* Should not be reached */
342 * This code gets copied to all the trap vectors
343 * (except ISI/DSI, ALI, and the interrupts)
346 .globl CNAME(trapcode),CNAME(trapcodeend)
348 mtsprg1 %r1 /* save SP */
349 mflr %r1 /* Save the old LR in r1 */
350 mtsprg2 %r1 /* And then in SPRG2 */
351 lwz %r1, TRAP_GENTRAP(0) /* Get branch address */
353 li %r1, 0xe0 /* How to get the vector from LR */
354 blrl /* LR & (0xff00 | r1) is exception # */
358 * For ALI: has to save DSISR and DAR
360 .globl CNAME(alitrap),CNAME(aliend)
362 mtsprg1 %r1 /* save SP */
364 stw %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) /* free r28-r31 */
365 stw %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
366 stw %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
367 stw %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
370 stw %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1)
371 stw %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1)
372 mfsprg1 %r1 /* restore SP, in case of branch */
373 mflr %r28 /* save LR */
374 mfcr %r29 /* save CR */
376 /* Put our exception vector in SPRG3 */
380 /* Test whether we already had PR set */
385 lwz %r31, TRAP_GENTRAP(0)
386 addi %r31, %r31, (s_trap - generictrap)
392 * G2 specific: instuction TLB miss.
394 .globl CNAME(imisstrap),CNAME(imisssize)
396 mfspr %r2, SPR_HASH1 /* get first pointer */
397 addi %r1, 0, 8 /* load 8 for counter */
398 mfctr %r0 /* save counter */
399 mfspr %r3, SPR_ICMP /* get first compare value */
400 addi %r2, %r2, -8 /* pre dec the pointer */
402 mtctr %r1 /* load counter */
404 lwzu %r1, 8(%r2) /* get next pte */
405 cmp 0, 0, %r1, %r3 /* see if found pte */
406 bdnzf 2, im1 /* dec count br if cmp ne and if
408 bne instr_sec_hash /* if not found set up second hash
410 lwz %r1, +4(%r2) /* load tlb entry lower-word */
411 andi. %r3, %r1, 8 /* check G bit */
412 bne do_isi_prot /* if guarded, take an ISI */
413 mtctr %r0 /* restore counter */
414 mfspr %r0, SPR_IMISS /* get the miss address for the tlbli */
415 mfspr %r3, SPR_SRR1 /* get the saved cr0 bits */
416 mtcrf 0x80, %r3 /* restore CR0 */
417 mtspr SPR_RPA, %r1 /* set the pte */
418 ori %r1, %r1, 0x100 /* set reference bit */
419 srwi %r1, %r1, 8 /* get byte 7 of pte */
420 tlbli %r0 /* load the itlb */
421 stb %r1, +6(%r2) /* update page table */
422 rfi /* return to executing program */
425 andi. %r1, %r3, 0x0040 /* see if we have done second hash */
426 bne do_isi /* if so, go to ISI interrupt */
427 mfspr %r2, SPR_HASH2 /* get the second pointer */
428 ori %r3, %r3, 0x0040 /* change the compare value */
429 addi %r1, %r0, 8 /* load 8 for counter */
430 addi %r2, %r2, -8 /* pre dec for update on load */
431 b im0 /* try second hash */
433 /* Create a faked ISI interrupt as the address was not found */
435 mfspr %r3, SPR_SRR1 /* get srr1 */
436 andi. %r2, %r3, 0xffff /* clean upper srr1 */
437 addis %r2, %r2, 0x0800 /* or in srr<4> = 1 to flag prot
441 mfspr %r3, SPR_SRR1 /* get srr1 */
442 andi. %r2, %r3, 0xffff /* clean srr1 */
443 addis %r2, %r2, 0x4000 /* or in srr1<1> = 1 to flag pte
446 mtctr %r0 /* restore counter */
447 mtspr SPR_SRR1, %r2 /* set srr1 */
448 mfmsr %r0 /* get msr */
449 xoris %r0, %r0, 0x2 /* flip the msr<tgpr> bit */
450 mtcrf 0x80, %r3 /* restore CR0 */
451 mtmsr %r0 /* flip back to the native gprs */
452 ba EXC_ISI /* go to instr. access interrupt */
454 CNAME(imisssize) = .-CNAME(imisstrap)
457 * G2 specific: data load TLB miss.
459 .globl CNAME(dlmisstrap),CNAME(dlmisssize)
461 mfspr %r2, SPR_HASH1 /* get first pointer */
462 addi %r1, 0, 8 /* load 8 for counter */
463 mfctr %r0 /* save counter */
464 mfspr %r3, SPR_DCMP /* get first compare value */
465 addi %r2, %r2, -8 /* pre dec the pointer */
467 mtctr %r1 /* load counter */
469 lwzu %r1, 8(%r2) /* get next pte */
470 cmp 0, 0, %r1, %r3 /* see if found pte */
471 bdnzf 2, dm1 /* dec count br if cmp ne and if
473 bne data_sec_hash /* if not found set up second hash
475 lwz %r1, +4(%r2) /* load tlb entry lower-word */
476 mtctr %r0 /* restore counter */
477 mfspr %r0, SPR_DMISS /* get the miss address for the tlbld */
478 mfspr %r3, SPR_SRR1 /* get the saved cr0 bits */
479 mtcrf 0x80, %r3 /* restore CR0 */
480 mtspr SPR_RPA, %r1 /* set the pte */
481 ori %r1, %r1, 0x100 /* set reference bit */
482 srwi %r1, %r1, 8 /* get byte 7 of pte */
483 tlbld %r0 /* load the dtlb */
484 stb %r1, +6(%r2) /* update page table */
485 rfi /* return to executing program */
488 andi. %r1, %r3, 0x0040 /* see if we have done second hash */
489 bne do_dsi /* if so, go to DSI interrupt */
490 mfspr %r2, SPR_HASH2 /* get the second pointer */
491 ori %r3, %r3, 0x0040 /* change the compare value */
492 addi %r1, 0, 8 /* load 8 for counter */
493 addi %r2, %r2, -8 /* pre dec for update on load */
494 b dm0 /* try second hash */
496 CNAME(dlmisssize) = .-CNAME(dlmisstrap)
499 * G2 specific: data store TLB miss.
501 .globl CNAME(dsmisstrap),CNAME(dsmisssize)
503 mfspr %r2, SPR_HASH1 /* get first pointer */
504 addi %r1, 0, 8 /* load 8 for counter */
505 mfctr %r0 /* save counter */
506 mfspr %r3, SPR_DCMP /* get first compare value */
507 addi %r2, %r2, -8 /* pre dec the pointer */
509 mtctr %r1 /* load counter */
511 lwzu %r1, 8(%r2) /* get next pte */
512 cmp 0, 0, %r1, %r3 /* see if found pte */
513 bdnzf 2, ds1 /* dec count br if cmp ne and if
515 bne data_store_sec_hash /* if not found set up second hash
517 lwz %r1, +4(%r2) /* load tlb entry lower-word */
518 andi. %r3, %r1, 0x80 /* check the C-bit */
519 beq data_store_chk_prot /* if (C==0)
520 * go check protection modes */
522 mtctr %r0 /* restore counter */
523 mfspr %r0, SPR_DMISS /* get the miss address for the tlbld */
524 mfspr %r3, SPR_SRR1 /* get the saved cr0 bits */
525 mtcrf 0x80, %r3 /* restore CR0 */
526 mtspr SPR_RPA, %r1 /* set the pte */
527 tlbld %r0 /* load the dtlb */
528 rfi /* return to executing program */
531 andi. %r1, %r3, 0x0040 /* see if we have done second hash */
532 bne do_dsi /* if so, go to DSI interrupt */
533 mfspr %r2, SPR_HASH2 /* get the second pointer */
534 ori %r3, %r3, 0x0040 /* change the compare value */
535 addi %r1, 0, 8 /* load 8 for counter */
536 addi %r2, %r2, -8 /* pre dec for update on load */
537 b ds0 /* try second hash */
539 /* Check the protection before setting PTE(c-bit) */
541 rlwinm. %r3,%r1,30,0,1 /* test PP */
542 bge- chk0 /* if (PP == 00 or PP == 01)
544 andi. %r3, %r1, 1 /* test PP[0] */
545 beq+ chk2 /* return if PP[0] == 0 */
546 b do_dsi_prot /* else DSIp */
548 mfspr %r3,SPR_SRR1 /* get old msr */
549 andis. %r3,%r3,0x0008 /* test the KEY bit (SRR1-bit 12) */
550 beq chk2 /* if (KEY==0) goto chk2: */
551 b do_dsi_prot /* else do_dsi_prot */
553 ori %r1, %r1, 0x180 /* set reference and change bit */
554 sth %r1, 6(%r2) /* update page table */
555 b ds2 /* and back we go */
557 /* Create a faked DSI interrupt as the address was not found */
559 mfspr %r3, SPR_SRR1 /* get srr1 */
560 rlwinm %r1,%r3,9,6,6 /* get srr1<flag> to bit 6 for
561 * load/store, zero rest */
562 addis %r1, %r1, 0x4000 /* or in dsisr<1> = 1 to flag pte
567 mfspr %r3, SPR_SRR1 /* get srr1 */
568 rlwinm %r1,%r3,9,6,6 /* get srr1<flag> to bit 6 for
569 *load/store, zero rest */
570 addis %r1, %r1, 0x0800 /* or in dsisr<4> = 1 to flag prot
574 mtctr %r0 /* restore counter */
575 andi. %r2, %r3, 0xffff /* clear upper bits of srr1 */
576 mtspr SPR_SRR1, %r2 /* set srr1 */
577 mtspr SPR_DSISR, %r1 /* load the dsisr */
578 mfspr %r1, SPR_DMISS /* get miss address */
579 rlwinm. %r2,%r2,0,31,31 /* test LE bit */
580 beq dsi2 /* if little endian then: */
581 xor %r1, %r1, 0x07 /* de-mung the data address */
583 mtspr SPR_DAR, %r1 /* put in dar */
584 mfmsr %r0 /* get msr */
585 xoris %r0, %r0, 0x2 /* flip the msr<tgpr> bit */
586 mtcrf 0x80, %r3 /* restore CR0 */
587 mtmsr %r0 /* flip back to the native gprs */
588 ba EXC_DSI /* branch to DSI interrupt */
590 CNAME(dsmisssize) = .-CNAME(dsmisstrap)
593 * Similar to the above for DSI
594 * Has to handle BAT spills
595 * and standard pagetable spills
597 .globl CNAME(dsitrap),CNAME(dsiend)
599 mtsprg1 %r1 /* save SP */
601 stw %r28,(PC_DISISAVE+CPUSAVE_R28)(%r1) /* free r28-r31 */
602 stw %r29,(PC_DISISAVE+CPUSAVE_R29)(%r1)
603 stw %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1)
604 stw %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1)
605 mfsprg1 %r1 /* restore SP */
606 mfcr %r29 /* save CR */
607 mfxer %r30 /* save XER */
608 mtsprg2 %r30 /* in SPRG2 */
609 mfsrr1 %r31 /* test kernel mode */
611 bt 17,1f /* branch if PSL_PR is set */
612 mfdar %r31 /* get fault address */
613 rlwinm %r31,%r31,7,25,28 /* get segment * 8 */
616 lwz %r30,TRAP_TOCBASE(0)
617 lwz %r30,CNAME(battable)@got(%r30)
621 bf 30,1f /* branch if supervisor valid is
625 /* We randomly use the highest two bat registers here */
636 mfsprg2 %r30 /* restore XER */
638 mtcr %r29 /* restore CR */
641 lwz %r28,(PC_DISISAVE+CPUSAVE_R28)(%r1) /* restore r28-r31 */
642 lwz %r29,(PC_DISISAVE+CPUSAVE_R29)(%r1)
643 lwz %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1)
644 lwz %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1)
646 rfi /* return to trapped code */
648 mflr %r28 /* save LR (SP already saved) */
650 /* Jump to disitrap */
651 lwz %r1, TRAP_GENTRAP(0)
652 addi %r1, %r1, (disitrap - generictrap)
658 * Preamble code for DSI/ISI traps
661 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */
667 lwz %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1)
668 stw %r30,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
669 lwz %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1)
670 stw %r31,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
671 lwz %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1)
672 stw %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
673 lwz %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1)
674 stw %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
677 stw %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1)
678 stw %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1)
681 /* Try to detect a kernel stack overflow */
684 bt 17,realtrap /* branch is user mode */
685 mfsprg1 %r31 /* get old SP */
686 clrrwi %r31,%r31,12 /* Round SP down to nearest page */
687 sub. %r30,%r31,%r30 /* SP - DAR */
689 neg %r30,%r30 /* modulo value */
690 1: cmplwi %cr0,%r30,4096 /* is DAR within a page of SP? */
691 bge %cr0,realtrap /* no, too far away. */
693 /* Now convert this DSI into a DDB trap. */
695 lwz %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) /* get DAR */
696 stw %r30,(PC_DBSAVE +CPUSAVE_AIM_DAR)(%r1) /* save DAR */
697 lwz %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) /* get DSISR */
698 stw %r31,(PC_DBSAVE +CPUSAVE_AIM_DSISR)(%r1) /* save DSISR */
699 lwz %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1) /* get r28 */
700 stw %r30,(PC_DBSAVE +CPUSAVE_R28)(%r1) /* save r28 */
701 lwz %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1) /* get r29 */
702 stw %r31,(PC_DBSAVE +CPUSAVE_R29)(%r1) /* save r29 */
703 lwz %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) /* get r30 */
704 stw %r30,(PC_DBSAVE +CPUSAVE_R30)(%r1) /* save r30 */
705 lwz %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) /* get r31 */
706 stw %r31,(PC_DBSAVE +CPUSAVE_R31)(%r1) /* save r31 */
710 /* XXX need stack probe here */
712 /* Test whether we already had PR set */
715 mfsprg1 %r1 /* restore SP (might have been
717 bf 17,k_trap /* branch if PSL_PR is false */
719 lwz %r1,PC_CURPCB(%r1)
720 RESTORE_KERN_SRS(%r30,%r31) /* enable kernel mapping */
724 * generictrap does some standard setup for trap handling to minimize
725 * the code that need be installed in the actual vectors. It expects
726 * the following conditions.
728 * R1 - Trap vector = LR & (0xff00 | R1)
729 * SPRG1 - Original R1 contents
730 * SPRG2 - Original LR
733 .globl CNAME(generictrap64)
742 .globl CNAME(generictrap)
744 /* Save R1 for computing the exception vector */
747 /* Save interesting registers */
749 stw %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1) /* free r28-r31 */
750 stw %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
751 stw %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
752 stw %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
753 mfsprg1 %r1 /* restore SP, in case of branch */
754 mfsprg2 %r28 /* save LR */
755 mfcr %r29 /* save CR */
757 /* Compute the exception vector from the link register */
764 /* Test whether we already had PR set */
769 bf 17,k_trap /* branch if PSL_PR is false */
772 lwz %r1,PC_CURPCB(%r1)
773 RESTORE_KERN_SRS(%r30,%r31) /* enable kernel mapping */
776 * Now the common trap catching code.
779 FRAME_SETUP(PC_TEMPSAVE)
780 /* Restore USER_SR */
782 lwz %r30,PC_CURPCB(%r30)
783 lwz %r30,PCB_AIM_USR_VSID(%r30)
784 mtsr USER_SR,%r30; sync; isync
785 /* Call C interrupt dispatcher: */
788 bl CNAME(powerpc_interrupt)
789 .globl CNAME(trapexit) /* backtrace code sentinel */
792 /* Disable interrupts: */
794 andi. %r3,%r3,~PSL_EE@l
797 /* Test AST pending: */
798 lwz %r5,FRAME_SRR1+8(%r1)
800 bf 17,1f /* branch if PSL_PR is false */
802 GET_CPUINFO(%r3) /* get per-CPU pointer */
803 lwz %r4, TD_FLAGS(%r2) /* get thread flags value
804 * (r2 is curthread) */
805 lis %r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@h
806 ori %r5,%r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@l
809 mfmsr %r3 /* re-enable interrupts */
815 .globl CNAME(asttrapexit) /* backtrace code sentinel #2 */
817 b trapexit /* test ast ret value ? */
819 FRAME_LEAVE(PC_TEMPSAVE)
821 .globl CNAME(rfi_patch1) /* replace rfi with rfid on ppc64 */
825 .globl CNAME(rfid_patch)
831 * Deliberate entry to dbtrap
833 .globl CNAME(breakpoint)
838 andi. %r3,%r3,~(PSL_EE|PSL_ME)@l
839 mtmsr %r3 /* disable interrupts */
842 stw %r28,(PC_DBSAVE+CPUSAVE_R28)(%r3)
843 stw %r29,(PC_DBSAVE+CPUSAVE_R29)(%r3)
844 stw %r30,(PC_DBSAVE+CPUSAVE_R30)(%r3)
845 stw %r31,(PC_DBSAVE+CPUSAVE_R31)(%r3)
853 * Now the kdb trap catching code.
856 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */
861 lwz %r1,TRAP_TOCBASE(0) /* get new SP */
862 lwz %r1,trapstk@got(%r1)
863 addi %r1,%r1,TRAPSTKSZ-16
865 FRAME_SETUP(PC_DBSAVE)
866 /* Call C trap code: */
868 bl CNAME(db_trap_glue)
871 /* This wasn't for KDB, so switch to real trap: */
872 lwz %r3,FRAME_EXC+8(%r1) /* save exception */
874 stw %r3,(PC_DBSAVE+CPUSAVE_R31)(%r4)
875 FRAME_LEAVE(PC_DBSAVE)
876 mtsprg1 %r1 /* prepare for entrance to realtrap */
878 stw %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
879 stw %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
880 stw %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
881 stw %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
884 lwz %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1)
885 mtsprg3 %r31 /* SPRG3 was clobbered by FRAME_LEAVE */
889 FRAME_LEAVE(PC_DBSAVE)
890 .globl CNAME(rfi_patch2) /* replace rfi with rfid on ppc64 */
895 * In case of KDB we want a separate trap catcher for it
897 .globl CNAME(dblow),CNAME(dbend)
899 mtsprg1 %r1 /* save SP */
900 mtsprg2 %r29 /* save r29 */
901 mfcr %r29 /* save CR in r29 */
904 bf 17,1f /* branch if privileged */
905 /* Unprivileged case */
906 mtcr %r29 /* put the condition register back */
907 mfsprg2 %r29 /* ... and r29 */
908 mflr %r1 /* save LR */
909 mtsprg2 %r1 /* And then in SPRG2 */
911 lwz %r1, TRAP_GENTRAP(0) /* Get branch address */
913 li %r1, 0 /* How to get the vector from LR */
914 blrl /* LR & (0xff00 | r1) is exception # */
916 /* Privileged, so drop to KDB */
918 stw %r28,(PC_DBSAVE+CPUSAVE_R28)(%r1) /* free r28 */
919 mfsprg2 %r28 /* r29 holds cr... */
920 stw %r28,(PC_DBSAVE+CPUSAVE_R29)(%r1) /* free r29 */
921 stw %r30,(PC_DBSAVE+CPUSAVE_R30)(%r1) /* free r30 */
922 stw %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1) /* free r31 */
923 mflr %r28 /* save LR */
926 lwz %r1, TRAP_GENTRAP(0)
927 addi %r1, %r1, (dbtrap - generictrap)