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>
42 /* Locate the per-CPU data structure */
43 #define GET_CPUINFO(r) \
45 #define GET_TOCBASE(r) \
46 lis r,DMAP_BASE_ADDRESS@highesta; /* To real-mode alias/dmap */ \
48 ori r,r,TRAP_TOCBASE; /* Magic address for TOC */ \
52 * Restore SRs for a pmap
54 * Requires that r28-r31 be scratch, with r28 initialized to the SLB cache
58 * User SRs are loaded through a pointer to the current pmap.
62 ld %r28,PC_USERSLB(%r28)
63 cmpdi %r28, 0 /* If user SLB pointer NULL, exit */
66 li %r29, 0 /* Set the counter to zero */
72 1: ld %r31, 0(%r28) /* Load SLB entry pointer */
73 cmpdi %r31, 0 /* If NULL, stop */
76 ld %r30, 0(%r31) /* Load SLBV */
77 ld %r31, 8(%r31) /* Load SLBE */
78 or %r31, %r31, %r29 /* Set SLBE slot */
79 slbmte %r30, %r31 /* Install SLB entry */
81 addi %r28, %r28, 8 /* Advance pointer */
86 * Kernel SRs are loaded directly from the PCPU fields
90 addi %r28,%r28,PC_KERNSLB
91 ld %r29,16(%r28) /* One past USER_SLB_SLOT */
93 beqlr /* If first kernel entry is invalid,
94 * SLBs not in use, so exit early */
96 /* Otherwise, set up SLBs */
97 li %r29, 0 /* Set the counter to zero */
103 1: cmpdi %r29, USER_SLB_SLOT /* Skip the user slot */
106 ld %r31, 8(%r28) /* Load SLBE */
107 cmpdi %r31, 0 /* If SLBE is not valid, stop */
109 ld %r30, 0(%r28) /* Load SLBV */
110 slbmte %r30, %r31 /* Install SLB entry */
112 2: addi %r28, %r28, 16 /* Advance pointer */
114 cmpdi %r29, 64 /* Repeat if we are not at the end */
119 * FRAME_SETUP assumes:
122 * savearea r27-r31,DAR,DSISR (DAR & DSISR only for DSI traps)
128 * SRR0/1 as at start of trap
130 * NOTE: SPRG1 is never used while the MMU is on, making it safe to reuse
131 * in any real-mode fault handler, including those handling double faults.
133 #define FRAME_SETUP(savearea) \
134 /* Have to enable translation to allow access of kernel stack: */ \
137 std %r30,(savearea+CPUSAVE_SRR0)(%r31); /* save SRR0 */ \
139 std %r30,(savearea+CPUSAVE_SRR1)(%r31); /* save SRR1 */ \
140 mfsprg1 %r31; /* get saved SP (clears SPRG1) */ \
142 ori %r30,%r30,(PSL_DR|PSL_IR|PSL_RI)@l; /* relocation on */ \
143 mtmsr %r30; /* stack can now be accessed */ \
145 stdu %r31,-(FRAMELEN+288)(%r1); /* save it in the callframe */ \
146 std %r0, FRAME_0+48(%r1); /* save r0 in the trapframe */ \
147 std %r31,FRAME_1+48(%r1); /* save SP " " */ \
148 std %r2, FRAME_2+48(%r1); /* save r2 " " */ \
149 std %r28,FRAME_LR+48(%r1); /* save LR " " */ \
150 std %r29,FRAME_CR+48(%r1); /* save CR " " */ \
152 ld %r27,(savearea+CPUSAVE_R27)(%r2); /* get saved r27 */ \
153 ld %r28,(savearea+CPUSAVE_R28)(%r2); /* get saved r28 */ \
154 ld %r29,(savearea+CPUSAVE_R29)(%r2); /* get saved r29 */ \
155 ld %r30,(savearea+CPUSAVE_R30)(%r2); /* get saved r30 */ \
156 ld %r31,(savearea+CPUSAVE_R31)(%r2); /* get saved r31 */ \
157 std %r3, FRAME_3+48(%r1); /* save r3-r31 */ \
158 std %r4, FRAME_4+48(%r1); \
159 std %r5, FRAME_5+48(%r1); \
160 std %r6, FRAME_6+48(%r1); \
161 std %r7, FRAME_7+48(%r1); \
162 std %r8, FRAME_8+48(%r1); \
163 std %r9, FRAME_9+48(%r1); \
164 std %r10, FRAME_10+48(%r1); \
165 std %r11, FRAME_11+48(%r1); \
166 std %r12, FRAME_12+48(%r1); \
167 std %r13, FRAME_13+48(%r1); \
168 std %r14, FRAME_14+48(%r1); \
169 std %r15, FRAME_15+48(%r1); \
170 std %r16, FRAME_16+48(%r1); \
171 std %r17, FRAME_17+48(%r1); \
172 std %r18, FRAME_18+48(%r1); \
173 std %r19, FRAME_19+48(%r1); \
174 std %r20, FRAME_20+48(%r1); \
175 std %r21, FRAME_21+48(%r1); \
176 std %r22, FRAME_22+48(%r1); \
177 std %r23, FRAME_23+48(%r1); \
178 std %r24, FRAME_24+48(%r1); \
179 std %r25, FRAME_25+48(%r1); \
180 std %r26, FRAME_26+48(%r1); \
181 std %r27, FRAME_27+48(%r1); \
182 std %r28, FRAME_28+48(%r1); \
183 std %r29, FRAME_29+48(%r1); \
184 std %r30, FRAME_30+48(%r1); \
185 std %r31, FRAME_31+48(%r1); \
186 ld %r28,(savearea+CPUSAVE_AIM_DAR)(%r2); /* saved DAR */ \
187 ld %r29,(savearea+CPUSAVE_AIM_DSISR)(%r2);/* saved DSISR */\
188 ld %r30,(savearea+CPUSAVE_SRR0)(%r2); /* saved SRR0 */ \
189 ld %r31,(savearea+CPUSAVE_SRR1)(%r2); /* saved SRR1 */ \
193 std %r3, FRAME_XER+48(1); /* save xer/ctr/exc */ \
194 std %r4, FRAME_CTR+48(1); \
195 std %r5, FRAME_EXC+48(1); \
196 std %r28,FRAME_AIM_DAR+48(1); \
197 std %r29,FRAME_AIM_DSISR+48(1); /* save dsisr/srr0/srr1 */ \
198 std %r30,FRAME_SRR0+48(1); \
199 std %r31,FRAME_SRR1+48(1); \
200 ld %r13,PC_CURTHREAD(%r2) /* set kernel curthread */
202 #define FRAME_LEAVE(savearea) \
203 /* Disable exceptions: */ \
205 andi. %r2,%r2,~PSL_EE@l; \
208 /* Now restore regs: */ \
209 ld %r2,FRAME_SRR0+48(%r1); \
210 ld %r3,FRAME_SRR1+48(%r1); \
211 ld %r4,FRAME_CTR+48(%r1); \
212 ld %r5,FRAME_XER+48(%r1); \
213 ld %r6,FRAME_LR+48(%r1); \
215 std %r2,(savearea+CPUSAVE_SRR0)(%r7); /* save SRR0 */ \
216 std %r3,(savearea+CPUSAVE_SRR1)(%r7); /* save SRR1 */ \
217 ld %r7,FRAME_CR+48(%r1); \
221 mtsprg2 %r7; /* save cr */ \
222 ld %r31,FRAME_31+48(%r1); /* restore r0-31 */ \
223 ld %r30,FRAME_30+48(%r1); \
224 ld %r29,FRAME_29+48(%r1); \
225 ld %r28,FRAME_28+48(%r1); \
226 ld %r27,FRAME_27+48(%r1); \
227 ld %r26,FRAME_26+48(%r1); \
228 ld %r25,FRAME_25+48(%r1); \
229 ld %r24,FRAME_24+48(%r1); \
230 ld %r23,FRAME_23+48(%r1); \
231 ld %r22,FRAME_22+48(%r1); \
232 ld %r21,FRAME_21+48(%r1); \
233 ld %r20,FRAME_20+48(%r1); \
234 ld %r19,FRAME_19+48(%r1); \
235 ld %r18,FRAME_18+48(%r1); \
236 ld %r17,FRAME_17+48(%r1); \
237 ld %r16,FRAME_16+48(%r1); \
238 ld %r15,FRAME_15+48(%r1); \
239 ld %r14,FRAME_14+48(%r1); \
240 ld %r13,FRAME_13+48(%r1); \
241 ld %r12,FRAME_12+48(%r1); \
242 ld %r11,FRAME_11+48(%r1); \
243 ld %r10,FRAME_10+48(%r1); \
244 ld %r9, FRAME_9+48(%r1); \
245 ld %r8, FRAME_8+48(%r1); \
246 ld %r7, FRAME_7+48(%r1); \
247 ld %r6, FRAME_6+48(%r1); \
248 ld %r5, FRAME_5+48(%r1); \
249 ld %r4, FRAME_4+48(%r1); \
250 ld %r3, FRAME_3+48(%r1); \
251 ld %r2, FRAME_2+48(%r1); \
252 ld %r0, FRAME_0+48(%r1); \
253 ld %r1, FRAME_1+48(%r1); \
254 /* Can't touch %r1 from here on */ \
255 mtsprg3 %r3; /* save r3 */ \
256 /* Disable translation, machine check and recoverability: */ \
258 andi. %r3,%r3,~(PSL_DR|PSL_IR|PSL_ME|PSL_RI)@l; \
261 /* Decide whether we return to user mode: */ \
263 ld %r3,(savearea+CPUSAVE_SRR1)(%r3); \
265 bf 17,1f; /* branch if PSL_PR is false */ \
266 /* Restore user SRs */ \
268 std %r27,(savearea+CPUSAVE_R27)(%r3); \
269 std %r28,(savearea+CPUSAVE_R28)(%r3); \
270 std %r29,(savearea+CPUSAVE_R29)(%r3); \
271 std %r30,(savearea+CPUSAVE_R30)(%r3); \
272 std %r31,(savearea+CPUSAVE_R31)(%r3); \
273 mflr %r27; /* preserve LR */ \
274 bl restore_usersrs; /* uses r28-r31 */ \
276 ld %r31,(savearea+CPUSAVE_R31)(%r3); \
277 ld %r30,(savearea+CPUSAVE_R30)(%r3); \
278 ld %r29,(savearea+CPUSAVE_R29)(%r3); \
279 ld %r28,(savearea+CPUSAVE_R28)(%r3); \
280 ld %r27,(savearea+CPUSAVE_R27)(%r3); \
281 1: mfsprg2 %r3; /* restore cr */ \
284 ld %r3,(savearea+CPUSAVE_SRR0)(%r3); /* restore srr0 */ \
287 ld %r3,(savearea+CPUSAVE_SRR1)(%r3); /* restore srr1 */ \
289 mfsprg3 %r3 /* restore r3 */
293 .globl dtrace_invop_calltrap_addr
295 .type dtrace_invop_calltrap_addr, @object
296 .size dtrace_invop_calltrap_addr, 8
297 dtrace_invop_calltrap_addr:
305 * Processor reset exception handler. These are typically
306 * the first instructions the processor executes after a
307 * software reset. We do this in two bits so that we are
308 * not still hanging around in the trap handling region
309 * once the MMU is turned on.
311 .globl CNAME(rstcode), CNAME(rstcodeend), CNAME(cpu_reset_handler)
312 .globl CNAME(cpu_wakeup_handler)
316 * Check if this is software reset or
317 * processor is waking up from power saving mode
318 * It is software reset when 46:47 = 0b00
320 mfsrr1 %r9 /* Load SRR1 into r9 */
321 andis. %r9,%r9,0x3 /* Logic AND with 46:47 bits */
322 beq 2f /* Branch if software reset */
324 .llong cpu_wakeup_handler
326 /* It is software reset */
328 /* Explicitly set MSR[SF] */
336 .llong cpu_reset_handler /* Make sure to maintain 8-byte alignment */
348 ld %r1,TOC_REF(tmpstk)(%r2) /* get new SP */
349 addi %r1,%r1,(TMPSTKSZ-48)
351 bl CNAME(cpudep_ap_early_bootstrap) /* Set PCPU */
354 bl CNAME(pmap_cpu_bootstrap) /* Turn on virtual memory */
356 bl CNAME(cpudep_ap_bootstrap) /* Set up PCPU and stack */
358 mr %r1,%r3 /* Use new stack */
359 bl CNAME(cpudep_ap_setup)
362 ld %r3,(PC_RESTORE)(%r5)
371 bl CNAME(machdep_ap_bootstrap) /* And away! */
375 /* Should not be reached */
382 /* Check for false wake up due to badly SRR1 set (eg. by OPAL) */
383 ld %r3,TOC_REF(can_wakeup)(%r2)
386 beq cpu_reset_handler
388 /* Turn on MMU after return from interrupt */
390 ori %r3,%r3,(PSL_IR | PSL_DR)
393 /* Turn on MMU (needed to access PCB) */
395 ori %r3,%r3,(PSL_IR | PSL_DR)
401 ld %r3,PC_CURTHREAD(%r3) /* Get current thread */
402 ld %r3,TD_PCB(%r3) /* Get PCB of current thread */
403 ld %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs. */
404 ld %r13,PCB_CONTEXT+1*8(%r3)
405 ld %r14,PCB_CONTEXT+2*8(%r3)
406 ld %r15,PCB_CONTEXT+3*8(%r3)
407 ld %r16,PCB_CONTEXT+4*8(%r3)
408 ld %r17,PCB_CONTEXT+5*8(%r3)
409 ld %r18,PCB_CONTEXT+6*8(%r3)
410 ld %r19,PCB_CONTEXT+7*8(%r3)
411 ld %r20,PCB_CONTEXT+8*8(%r3)
412 ld %r21,PCB_CONTEXT+9*8(%r3)
413 ld %r22,PCB_CONTEXT+10*8(%r3)
414 ld %r23,PCB_CONTEXT+11*8(%r3)
415 ld %r24,PCB_CONTEXT+12*8(%r3)
416 ld %r25,PCB_CONTEXT+13*8(%r3)
417 ld %r26,PCB_CONTEXT+14*8(%r3)
418 ld %r27,PCB_CONTEXT+15*8(%r3)
419 ld %r28,PCB_CONTEXT+16*8(%r3)
420 ld %r29,PCB_CONTEXT+17*8(%r3)
421 ld %r30,PCB_CONTEXT+18*8(%r3)
422 ld %r31,PCB_CONTEXT+19*8(%r3)
423 ld %r5,PCB_CR(%r3) /* Load the condition register */
425 ld %r5,PCB_LR(%r3) /* Load the link register */
427 ld %r1,PCB_SP(%r3) /* Load the stack pointer */
428 ld %r2,PCB_TOC(%r3) /* Load the TOC pointer */
433 * This code gets copied to all the trap vectors
434 * (except ISI/DSI, ALI, and the interrupts). Has to fit in 8 instructions!
437 .globl CNAME(trapcode),CNAME(trapcodeend)
440 mtsprg1 %r1 /* save SP */
441 mflr %r1 /* Save the old LR in r1 */
442 mtsprg2 %r1 /* And then in SPRG2 */
443 ld %r1,TRAP_GENTRAP(0)
445 li %r1, 0xe0 /* How to get the vector from LR */
446 blrl /* Branch to generictrap */
450 * For SLB misses: do special things for the kernel
452 * Note: SPRG1 is always safe to overwrite any time the MMU is on, which is
453 * the only time this can be called.
455 .globl CNAME(slbtrap),CNAME(slbtrapend)
458 mtsprg1 %r1 /* save SP */
460 std %r2,(PC_SLBSAVE+16)(%r1)
461 mfcr %r2 /* save CR */
462 std %r2,(PC_SLBSAVE+104)(%r1)
463 mfsrr1 %r2 /* test kernel mode */
465 bf 17,2f /* branch if PSL_PR is false */
467 ld %r2,(PC_SLBSAVE+104)(%r1) /* Restore CR */
469 ld %r2,(PC_SLBSAVE+16)(%r1) /* Restore R2 */
470 mflr %r1 /* Save the old LR in r1 */
471 mtsprg2 %r1 /* And then in SPRG2 */
472 /* 52 bytes so far */
478 li %r1, 0x80 /* How to get the vector from LR */
479 blrl /* Branch to generictrap */
481 2: mflr %r2 /* Save the old LR in r2 */
483 bl 3f /* Begin dance to jump to kern_slbtrap*/
489 blrl /* 124 bytes -- 4 to spare */
493 std %r2,(PC_SLBSAVE+136)(%r1) /* old LR */
494 std %r3,(PC_SLBSAVE+24)(%r1) /* save R3 */
496 /* Check if this needs to be handled as a regular trap (userseg miss) */
504 2: /* r2 now contains the fault address */
505 lis %r3,SEGMENT_MASK@highesta
506 ori %r3,%r3,SEGMENT_MASK@highera
508 oris %r3,%r3,SEGMENT_MASK@ha
509 ori %r3,%r3,SEGMENT_MASK@l
510 and %r2,%r2,%r3 /* R2 = segment base address */
511 lis %r3,USER_ADDR@highesta
512 ori %r3,%r3,USER_ADDR@highera
514 oris %r3,%r3,USER_ADDR@ha
515 ori %r3,%r3,USER_ADDR@l
516 cmpd %r2,%r3 /* Compare fault base to USER_ADDR */
519 /* User seg miss, handle as a regular trap */
520 ld %r2,(PC_SLBSAVE+104)(%r1) /* Restore CR */
522 ld %r2,(PC_SLBSAVE+16)(%r1) /* Restore R2,R3 */
523 ld %r3,(PC_SLBSAVE+24)(%r1)
524 ld %r1,(PC_SLBSAVE+136)(%r1) /* Save the old LR in r1 */
525 mtsprg2 %r1 /* And then in SPRG2 */
526 li %r1, 0x80 /* How to get the vector from LR */
527 b generictrap /* Retain old LR using b */
529 3: /* Real kernel SLB miss */
530 std %r0,(PC_SLBSAVE+0)(%r1) /* free all volatile regs */
531 mfsprg1 %r2 /* Old R1 */
532 std %r2,(PC_SLBSAVE+8)(%r1)
533 /* R2,R3 already saved */
534 std %r4,(PC_SLBSAVE+32)(%r1)
535 std %r5,(PC_SLBSAVE+40)(%r1)
536 std %r6,(PC_SLBSAVE+48)(%r1)
537 std %r7,(PC_SLBSAVE+56)(%r1)
538 std %r8,(PC_SLBSAVE+64)(%r1)
539 std %r9,(PC_SLBSAVE+72)(%r1)
540 std %r10,(PC_SLBSAVE+80)(%r1)
541 std %r11,(PC_SLBSAVE+88)(%r1)
542 std %r12,(PC_SLBSAVE+96)(%r1)
543 /* CR already saved */
544 mfxer %r2 /* save XER */
545 std %r2,(PC_SLBSAVE+112)(%r1)
546 mflr %r2 /* save LR (SP already saved) */
547 std %r2,(PC_SLBSAVE+120)(%r1)
548 mfctr %r2 /* save CTR */
549 std %r2,(PC_SLBSAVE+128)(%r1)
552 addi %r1,%r1,PC_SLBSTACK-48+1024
560 bl handle_kernel_slb_spill
563 /* Save r28-31, restore r4-r12 */
565 ld %r4,(PC_SLBSAVE+32)(%r1)
566 ld %r5,(PC_SLBSAVE+40)(%r1)
567 ld %r6,(PC_SLBSAVE+48)(%r1)
568 ld %r7,(PC_SLBSAVE+56)(%r1)
569 ld %r8,(PC_SLBSAVE+64)(%r1)
570 ld %r9,(PC_SLBSAVE+72)(%r1)
571 ld %r10,(PC_SLBSAVE+80)(%r1)
572 ld %r11,(PC_SLBSAVE+88)(%r1)
573 ld %r12,(PC_SLBSAVE+96)(%r1)
574 std %r28,(PC_SLBSAVE+64)(%r1)
575 std %r29,(PC_SLBSAVE+72)(%r1)
576 std %r30,(PC_SLBSAVE+80)(%r1)
577 std %r31,(PC_SLBSAVE+88)(%r1)
579 /* Restore kernel mapping */
582 /* Restore remaining registers */
583 ld %r28,(PC_SLBSAVE+64)(%r1)
584 ld %r29,(PC_SLBSAVE+72)(%r1)
585 ld %r30,(PC_SLBSAVE+80)(%r1)
586 ld %r31,(PC_SLBSAVE+88)(%r1)
588 ld %r2,(PC_SLBSAVE+104)(%r1)
590 ld %r2,(PC_SLBSAVE+112)(%r1)
592 ld %r2,(PC_SLBSAVE+120)(%r1)
594 ld %r2,(PC_SLBSAVE+128)(%r1)
596 ld %r2,(PC_SLBSAVE+136)(%r1)
600 ld %r0,(PC_SLBSAVE+0)(%r1)
601 ld %r2,(PC_SLBSAVE+16)(%r1)
602 ld %r3,(PC_SLBSAVE+24)(%r1)
605 /* Back to whatever we were doing */
609 * For ALI: has to save DSISR and DAR
611 .globl CNAME(alitrap),CNAME(aliend)
613 mtsprg1 %r1 /* save SP */
615 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */
616 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
617 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
618 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
619 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
622 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1)
623 std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1)
624 mfsprg1 %r1 /* restore SP, in case of branch */
625 mflr %r28 /* save LR */
626 mfcr %r29 /* save CR */
628 /* Begin dance to branch to s_trap in a bit */
638 /* Put our exception vector in SPRG3 */
642 /* Test whether we already had PR set */
649 * Similar to the above for DSI
650 * Has to handle standard pagetable spills
652 .globl CNAME(dsitrap),CNAME(dsiend)
655 mtsprg1 %r1 /* save SP */
657 std %r27,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */
658 std %r28,(PC_DISISAVE+CPUSAVE_R28)(%r1)
659 std %r29,(PC_DISISAVE+CPUSAVE_R29)(%r1)
660 std %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1)
661 std %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1)
662 mfcr %r29 /* save CR */
663 mfxer %r30 /* save XER */
664 mtsprg2 %r30 /* in SPRG2 */
665 mfsrr1 %r31 /* test kernel mode */
667 mflr %r28 /* save LR (SP already saved) */
668 bl 1f /* Begin branching to disitrap */
673 blrl /* Branch to generictrap */
677 * Preamble code for DSI/ISI traps
680 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */
686 ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1)
687 std %r31,(PC_TEMPSAVE+CPUSAVE_R27)(%r1)
688 ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1)
689 std %r30,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
690 ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1)
691 std %r31,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
692 ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1)
693 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
694 ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1)
695 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
698 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1)
699 std %r31,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1)
702 /* Try to detect a kernel stack overflow */
705 bt 17,realtrap /* branch is user mode */
706 mfsprg1 %r31 /* get old SP */
707 clrrdi %r31,%r31,12 /* Round SP down to nearest page */
708 sub. %r30,%r31,%r30 /* SP - DAR */
710 neg %r30,%r30 /* modulo value */
711 1: cmpldi %cr0,%r30,4096 /* is DAR within a page of SP? */
712 bge %cr0,realtrap /* no, too far away. */
714 /* Now convert this DSI into a DDB trap. */
716 ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1) /* get DAR */
717 std %r30,(PC_DBSAVE +CPUSAVE_AIM_DAR)(%r1) /* save DAR */
718 ld %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DSISR)(%r1) /* get DSISR */
719 std %r30,(PC_DBSAVE +CPUSAVE_AIM_DSISR)(%r1) /* save DSISR */
720 ld %r31,(PC_DISISAVE+CPUSAVE_R27)(%r1) /* get r27 */
721 std %r31,(PC_DBSAVE +CPUSAVE_R27)(%r1) /* save r27 */
722 ld %r30,(PC_DISISAVE+CPUSAVE_R28)(%r1) /* get r28 */
723 std %r30,(PC_DBSAVE +CPUSAVE_R28)(%r1) /* save r28 */
724 ld %r31,(PC_DISISAVE+CPUSAVE_R29)(%r1) /* get r29 */
725 std %r31,(PC_DBSAVE +CPUSAVE_R29)(%r1) /* save r29 */
726 ld %r30,(PC_DISISAVE+CPUSAVE_R30)(%r1) /* get r30 */
727 std %r30,(PC_DBSAVE +CPUSAVE_R30)(%r1) /* save r30 */
728 ld %r31,(PC_DISISAVE+CPUSAVE_R31)(%r1) /* get r31 */
729 std %r31,(PC_DBSAVE +CPUSAVE_R31)(%r1) /* save r31 */
733 /* XXX need stack probe here */
735 /* Test whether we already had PR set */
738 mfsprg1 %r1 /* restore SP (might have been
740 bf 17,k_trap /* branch if PSL_PR is false */
742 ld %r1,PC_CURPCB(%r1)
743 mr %r27,%r28 /* Save LR, r29 */
745 bl restore_kernsrs /* enable kernel mapping */
751 * generictrap does some standard setup for trap handling to minimize
752 * the code that need be installed in the actual vectors. It expects
753 * the following conditions.
755 * R1 - Trap vector = LR & (0xff00 | R1)
756 * SPRG1 - Original R1 contents
757 * SPRG2 - Original LR
760 .globl CNAME(generictrap)
762 /* Save R1 for computing the exception vector */
765 /* Save interesting registers */
767 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1) /* free r27-r31 */
768 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
769 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
770 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
771 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
773 std %r30,(PC_TEMPSAVE+CPUSAVE_AIM_DAR)(%r1)
774 mfsprg1 %r1 /* restore SP, in case of branch */
775 mfsprg2 %r28 /* save LR */
776 mfcr %r29 /* save CR */
778 /* Compute the exception vector from the link register */
782 addi %r30,%r30,-4 /* The branch instruction, not the next */
786 /* Test whether we already had PR set */
791 bf 17,k_trap /* branch if PSL_PR is false */
794 ld %r1,PC_CURPCB(%r1)
795 mr %r27,%r28 /* Save LR, r29 */
797 bl restore_kernsrs /* enable kernel mapping */
802 * Now the common trap catching code.
805 FRAME_SETUP(PC_TEMPSAVE)
806 /* Call C interrupt dispatcher: */
810 bl CNAME(powerpc_interrupt)
813 .globl CNAME(trapexit) /* backtrace code sentinel */
815 /* Disable interrupts: */
817 andi. %r3,%r3,~PSL_EE@l
820 /* Test AST pending: */
821 ld %r5,FRAME_SRR1+48(%r1)
823 bf 17,1f /* branch if PSL_PR is false */
825 GET_CPUINFO(%r3) /* get per-CPU pointer */
826 lwz %r4, TD_FLAGS(%r13) /* get thread flags value */
827 lis %r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@h
828 ori %r5,%r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@l
831 mfmsr %r3 /* re-enable interrupts */
839 .globl CNAME(asttrapexit) /* backtrace code sentinel #2 */
841 b trapexit /* test ast ret value ? */
843 FRAME_LEAVE(PC_TEMPSAVE)
848 * Deliberate entry to dbtrap
850 ASENTRY_NOPROF(breakpoint)
854 andi. %r3,%r3,~(PSL_EE|PSL_ME)@l
855 mtmsr %r3 /* disable interrupts */
858 std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r3)
859 std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r3)
860 std %r29,(PC_DBSAVE+CPUSAVE_R29)(%r3)
861 std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r3)
862 std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r3)
870 * Now the kdb trap catching code.
873 /* Write the trap vector to SPRG3 by computing LR & 0xff00 */
878 ld %r1,TRAP_TOCBASE(0) /* get new SP */
879 ld %r1,TOC_REF(tmpstk)(%r1)
880 addi %r1,%r1,(TMPSTKSZ-48)
882 FRAME_SETUP(PC_DBSAVE)
883 /* Call C trap code: */
886 bl CNAME(db_trap_glue)
890 /* This wasn't for KDB, so switch to real trap: */
891 ld %r3,FRAME_EXC+48(%r1) /* save exception */
893 std %r3,(PC_DBSAVE+CPUSAVE_R31)(%r4)
894 FRAME_LEAVE(PC_DBSAVE)
895 mtsprg1 %r1 /* prepare for entrance to realtrap */
897 std %r27,(PC_TEMPSAVE+CPUSAVE_R27)(%r1)
898 std %r28,(PC_TEMPSAVE+CPUSAVE_R28)(%r1)
899 std %r29,(PC_TEMPSAVE+CPUSAVE_R29)(%r1)
900 std %r30,(PC_TEMPSAVE+CPUSAVE_R30)(%r1)
901 std %r31,(PC_TEMPSAVE+CPUSAVE_R31)(%r1)
904 ld %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1)
905 mtsprg3 %r31 /* SPRG3 was clobbered by FRAME_LEAVE */
909 FRAME_LEAVE(PC_DBSAVE)
913 * In case of KDB we want a separate trap catcher for it
915 .globl CNAME(dblow),CNAME(dbend)
918 mtsprg1 %r1 /* save SP */
919 mtsprg2 %r29 /* save r29 */
920 mfcr %r29 /* save CR in r29 */
923 bf 17,1f /* branch if privileged */
925 /* Unprivileged case */
926 mtcr %r29 /* put the condition register back */
927 mfsprg2 %r29 /* ... and r29 */
928 mflr %r1 /* save LR */
929 mtsprg2 %r1 /* And then in SPRG2 */
931 ld %r1, TRAP_GENTRAP(0) /* Get branch address */
933 li %r1, 0 /* How to get the vector from LR */
934 blrl /* Branch to generictrap */
938 std %r27,(PC_DBSAVE+CPUSAVE_R27)(%r1) /* free r27 */
939 std %r28,(PC_DBSAVE+CPUSAVE_R28)(%r1) /* free r28 */
940 mfsprg2 %r28 /* r29 holds cr... */
941 std %r28,(PC_DBSAVE+CPUSAVE_R29)(%r1) /* free r29 */
942 std %r30,(PC_DBSAVE+CPUSAVE_R30)(%r1) /* free r30 */
943 std %r31,(PC_DBSAVE+CPUSAVE_R31)(%r1) /* free r31 */
944 mflr %r28 /* save LR */
946 bl 9f /* Begin branch */
951 blrl /* Branch to generictrap */