1 /* SPDX-License-Identifier: GPL-2.0 */
3 * arch/ia64/kernel/ivt.S
5 * Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
6 * Stephane Eranian <eranian@hpl.hp.com>
7 * David Mosberger <davidm@hpl.hp.com>
8 * Copyright (C) 2000, 2002-2003 Intel Co
9 * Asit Mallick <asit.k.mallick@intel.com>
10 * Suresh Siddha <suresh.b.siddha@intel.com>
11 * Kenneth Chen <kenneth.w.chen@intel.com>
12 * Fenghua Yu <fenghua.yu@intel.com>
14 * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> TLB handling for SMP
15 * 00/12/20 David Mosberger-Tang <davidm@hpl.hp.com> DTLB/ITLB handler now uses virtual PT.
17 * Copyright (C) 2005 Hewlett-Packard Co
18 * Dan Magenheimer <dan.magenheimer@hp.com>
19 * Xen paravirtualization
20 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
21 * VA Linux Systems Japan K.K.
23 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
26 * This file defines the interruption vector table used by the CPU.
27 * It does not include one entry per possible cause of interruption.
29 * The first 20 entries of the table contain 64 bundles each while the
30 * remaining 48 entries contain only 16 bundles each.
32 * The 64 bundles are used to allow inlining the whole handler for critical
33 * interruptions like TLB misses.
35 * For each entry, the comment is as follows:
37 * // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
38 * entry offset ----/ / / / /
39 * entry number ---------/ / / /
40 * size of the entry -------------/ / /
41 * vector name -------------------------------------/ /
42 * interruptions triggering this vector ----------------------/
44 * The table is 32KB in size and must be aligned on 32KB boundary.
45 * (The CPU ignores the 15 lower bits of the address)
47 * Table is based upon EAS2.6 (Oct 1999)
51 #include <linux/pgtable.h>
52 #include <asm/asmmacro.h>
53 #include <asm/break.h>
54 #include <asm/kregs.h>
55 #include <asm/asm-offsets.h>
56 #include <asm/processor.h>
57 #include <asm/ptrace.h>
58 #include <asm/thread_info.h>
59 #include <asm/unistd.h>
60 #include <asm/errno.h>
61 #include <asm/export.h>
64 # define PSR_DEFAULT_BITS psr.ac
66 # define PSR_DEFAULT_BITS 0
71 * This lets you track the last eight faults that occurred on the CPU. Make sure ar.k2 isn't
72 * needed for something else before enabling this...
74 # define DBG_FAULT(i) mov r16=ar.k2;; shl r16=r16,8;; add r16=(i),r16;;mov ar.k2=r16
83 mov r19=n;; /* prepare to save predicates */ \
84 br.sptk.many dispatch_to_fault_handler
86 .section .text..ivt,"ax"
88 .align 32768 // align on 32KB boundary
90 EXPORT_DATA_SYMBOL(ia64_ivt)
92 /////////////////////////////////////////////////////////////////////////////////////////
93 // 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)
97 * The VHPT vector is invoked when the TLB entry for the virtual page table
98 * is missing. This happens only as a result of a previous
99 * (the "original") TLB miss, which may either be caused by an instruction
100 * fetch or a data access (or non-access).
102 * What we do here is normal TLB miss handing for the _original_ miss,
103 * followed by inserting the TLB entry for the virtual page table page
104 * that the VHPT walker was attempting to access. The latter gets
105 * inserted as long as page table entry above pte level have valid
106 * mappings for the faulting address. The TLB entry for the original
107 * miss gets inserted only if the pte entry indicates that the page is
110 * do_page_fault gets invoked in the following cases:
111 * - the faulting virtual address uses unimplemented address bits
112 * - the faulting virtual address has no valid page table mapping
114 MOV_FROM_IFA(r16) // get address that caused the TLB miss
115 #ifdef CONFIG_HUGETLB_PAGE
120 RSM_PSR_DT // use physical addressing for data
121 mov r31=pr // save the predicate registers
122 mov r19=IA64_KR(PT_BASE) // get page table base address
123 shl r21=r16,3 // shift bit 60 into sign bit
124 shr.u r17=r16,61 // get the region number into r17
127 #ifdef CONFIG_HUGETLB_PAGE
133 (p8) dep r25=r18,r25,2,6
137 cmp.eq p6,p7=5,r17 // is IFA pointing into to region 5?
138 shr.u r18=r22,PGDIR_SHIFT // get bottom portion of pgd index bit
140 (p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
143 LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
145 .pred.rel "mutex", p6, p7
146 (p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
147 (p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
149 (p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=pgd_offset for region 5
150 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=pgd_offset for region[0-4]
151 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
152 #if CONFIG_PGTABLE_LEVELS == 4
153 shr.u r28=r22,PUD_SHIFT // shift pud index into position
155 shr.u r18=r22,PMD_SHIFT // shift pmd index into position
158 ld8 r17=[r17] // get *pgd (may be 0)
160 (p7) cmp.eq p6,p7=r17,r0 // was pgd_present(*pgd) == NULL?
161 #if CONFIG_PGTABLE_LEVELS == 4
162 dep r28=r28,r17,3,(PAGE_SHIFT-3) // r28=pud_offset(pgd,addr)
164 shr.u r18=r22,PMD_SHIFT // shift pmd index into position
165 (p7) ld8 r29=[r28] // get *pud (may be 0)
167 (p7) cmp.eq.or.andcm p6,p7=r29,r0 // was pud_present(*pud) == NULL?
168 dep r17=r18,r29,3,(PAGE_SHIFT-3) // r17=pmd_offset(pud,addr)
170 dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=pmd_offset(pgd,addr)
173 (p7) ld8 r20=[r17] // get *pmd (may be 0)
174 shr.u r19=r22,PAGE_SHIFT // shift pte index into position
176 (p7) cmp.eq.or.andcm p6,p7=r20,r0 // was pmd_present(*pmd) == NULL?
177 dep r21=r19,r20,3,(PAGE_SHIFT-3) // r21=pte_offset(pmd,addr)
179 (p7) ld8 r18=[r21] // read *pte
180 MOV_FROM_ISR(r19) // cr.isr bit 32 tells us if this is an insn miss
182 (p7) tbit.z p6,p7=r18,_PAGE_P_BIT // page present bit cleared?
183 MOV_FROM_IHA(r22) // get the VHPT address that caused the TLB miss
184 ;; // avoid RAW on p7
185 (p7) tbit.nz.unc p10,p11=r19,32 // is it an instruction TLB miss?
186 dep r23=0,r20,0,PAGE_SHIFT // clear low bits to get page address
188 ITC_I_AND_D(p10, p11, r18, r24) // insert the instruction TLB entry and
189 // insert the data TLB entry
190 (p6) br.cond.spnt.many page_fault // handle bad address/page not present (page fault)
193 #ifdef CONFIG_HUGETLB_PAGE
194 MOV_TO_ITIR(p8, r25, r24) // change to default page-size for VHPT
198 * Now compute and insert the TLB entry for the virtual page table. We never
199 * execute in a page table page so there is no need to set the exception deferral
202 adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
208 * Tell the assemblers dependency-violation checker that the above "itc" instructions
209 * cannot possibly affect the following loads:
214 * Re-check pagetable entry. If they changed, we may have received a ptc.g
215 * between reading the pagetable and the "itc". If so, flush the entry we
216 * inserted and retry. At this point, we have:
218 * r28 = equivalent of pud_offset(pgd, ifa)
219 * r17 = equivalent of pmd_offset(pud, ifa)
220 * r21 = equivalent of pte_offset(pmd, ifa)
226 ld8 r25=[r21] // read *pte again
227 ld8 r26=[r17] // read *pmd again
228 #if CONFIG_PGTABLE_LEVELS == 4
229 ld8 r19=[r28] // read *pud again
233 cmp.ne.or.andcm p6,p7=r26,r20 // did *pmd change
234 #if CONFIG_PGTABLE_LEVELS == 4
235 cmp.ne.or.andcm p6,p7=r19,r29 // did *pud change
237 mov r27=PAGE_SHIFT<<2
239 (p6) ptc.l r22,r27 // purge PTE page translation
240 (p7) cmp.ne.or.andcm p6,p7=r25,r18 // did *pte change
242 (p6) ptc.l r16,r27 // purge translation
245 mov pr=r31,-1 // restore predicate registers
250 /////////////////////////////////////////////////////////////////////////////////////////
251 // 0x0400 Entry 1 (size 64 bundles) ITLB (21)
255 * The ITLB handler accesses the PTE via the virtually mapped linear
256 * page table. If a nested TLB miss occurs, we switch into physical
257 * mode, walk the page table, and then re-execute the PTE read and
258 * go on normally after that.
260 MOV_FROM_IFA(r16) // get virtual address
261 mov r29=b0 // save b0
262 mov r31=pr // save predicates
264 MOV_FROM_IHA(r17) // get virtual address of PTE
265 movl r30=1f // load nested fault continuation point
267 1: ld8 r18=[r17] // read *pte
270 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
271 (p6) br.cond.spnt page_fault
277 * Tell the assemblers dependency-violation checker that the above "itc" instructions
278 * cannot possibly affect the following loads:
282 ld8 r19=[r17] // read *pte again and see if same
283 mov r20=PAGE_SHIFT<<2 // setup page size for purge
294 /////////////////////////////////////////////////////////////////////////////////////////
295 // 0x0800 Entry 2 (size 64 bundles) DTLB (9,48)
299 * The DTLB handler accesses the PTE via the virtually mapped linear
300 * page table. If a nested TLB miss occurs, we switch into physical
301 * mode, walk the page table, and then re-execute the PTE read and
302 * go on normally after that.
304 MOV_FROM_IFA(r16) // get virtual address
305 mov r29=b0 // save b0
306 mov r31=pr // save predicates
308 MOV_FROM_IHA(r17) // get virtual address of PTE
309 movl r30=1f // load nested fault continuation point
311 1: ld8 r18=[r17] // read *pte
314 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
315 (p6) br.cond.spnt page_fault
321 * Tell the assemblers dependency-violation checker that the above "itc" instructions
322 * cannot possibly affect the following loads:
326 ld8 r19=[r17] // read *pte again and see if same
327 mov r20=PAGE_SHIFT<<2 // setup page size for purge
338 /////////////////////////////////////////////////////////////////////////////////////////
339 // 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
342 MOV_FROM_IFA(r16) // get address that caused the TLB miss
344 MOV_FROM_IPSR(p0, r21)
345 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
348 #ifdef CONFIG_DISABLE_VHPT
349 shr.u r22=r16,61 // get the region number into r21
351 cmp.gt p8,p0=6,r22 // user mode
353 THASH(p8, r17, r16, r23)
355 MOV_TO_IHA(p8, r17, r23)
356 (p8) mov r29=b0 // save b0
357 (p8) br.cond.dptk .itlb_fault
359 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
360 and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
361 shr.u r18=r16,57 // move address bit 61 to bit 4
363 andcm r18=0x10,r18 // bit 4=~address-bit(61)
364 cmp.ne p8,p0=r0,r23 // psr.cpl != 0?
365 or r19=r17,r19 // insert PTE control bits into r19
367 or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
368 (p8) br.cond.spnt page_fault
370 ITC_I(p0, r19, r18) // insert the TLB entry
376 /////////////////////////////////////////////////////////////////////////////////////////
377 // 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
380 MOV_FROM_IFA(r16) // get address that caused the TLB miss
383 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
384 MOV_FROM_IPSR(p0, r21)
388 #ifdef CONFIG_DISABLE_VHPT
389 shr.u r22=r16,61 // get the region number into r21
391 cmp.gt p8,p0=6,r22 // access to region 0-5
393 THASH(p8, r17, r16, r25)
395 MOV_TO_IHA(p8, r17, r25)
396 (p8) mov r29=b0 // save b0
397 (p8) br.cond.dptk dtlb_fault
399 cmp.ge p10,p11=r16,r24 // access to per_cpu_data?
400 tbit.z p12,p0=r16,61 // access to region 6?
401 mov r25=PERCPU_PAGE_SHIFT << 2
402 mov r26=PERCPU_PAGE_SIZE
406 (p10) mov r19=IA64_KR(PER_CPU_DATA)
407 (p11) and r19=r19,r16 // clear non-ppn fields
408 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
409 and r22=IA64_ISR_CODE_MASK,r20 // get the isr.code field
410 tbit.nz p6,p7=r20,IA64_ISR_SP_BIT // is speculation bit on?
411 tbit.nz p9,p0=r20,IA64_ISR_NA_BIT // is non-access bit on?
413 (p10) sub r19=r19,r26
414 MOV_TO_ITIR(p10, r25, r24)
416 (p9) cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22 // check isr.code field
417 (p12) dep r17=-1,r17,4,1 // set ma=UC for region 6 addr
418 (p8) br.cond.spnt page_fault
420 dep r21=-1,r21,IA64_PSR_ED_BIT,1
422 or r19=r19,r17 // insert PTE control bits into r19
423 MOV_TO_IPSR(p6, r21, r24)
425 ITC_D(p7, r19, r18) // insert the TLB entry
431 /////////////////////////////////////////////////////////////////////////////////////////
432 // 0x1400 Entry 5 (size 64 bundles) Data nested TLB (6,45)
433 ENTRY(nested_dtlb_miss)
435 * In the absence of kernel bugs, we get here when the virtually mapped linear
436 * page table is accessed non-speculatively (e.g., in the Dirty-bit, Instruction
437 * Access-bit, or Data Access-bit faults). If the DTLB entry for the virtual page
438 * table is missing, a nested TLB miss fault is triggered and control is
439 * transferred to this point. When this happens, we lookup the pte for the
440 * faulting address by walking the page table in physical mode and return to the
441 * continuation point passed in register r30 (or call page_fault if the address is
444 * Input: r16: faulting address
446 * r30: continuation address
449 * Output: r17: physical address of PTE of faulting address
451 * r30: continuation address
454 * Clobbered: b0, r18, r19, r21, r22, psr.dt (cleared)
456 RSM_PSR_DT // switch to using physical data addressing
457 mov r19=IA64_KR(PT_BASE) // get the page table base address
458 shl r21=r16,3 // shift bit 60 into sign bit
461 shr.u r17=r16,61 // get the region number into r17
462 extr.u r18=r18,2,6 // get the faulting page size
464 cmp.eq p6,p7=5,r17 // is faulting address in region 5?
465 add r22=-PAGE_SHIFT,r18 // adjustment for hugetlb address
466 add r18=PGDIR_SHIFT-PAGE_SHIFT,r18
470 (p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
473 LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
475 .pred.rel "mutex", p6, p7
476 (p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
477 (p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
479 (p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=pgd_offset for region 5
480 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=pgd_offset for region[0-4]
481 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
482 #if CONFIG_PGTABLE_LEVELS == 4
483 shr.u r18=r22,PUD_SHIFT // shift pud index into position
485 shr.u r18=r22,PMD_SHIFT // shift pmd index into position
488 ld8 r17=[r17] // get *pgd (may be 0)
490 (p7) cmp.eq p6,p7=r17,r0 // was pgd_present(*pgd) == NULL?
491 dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=p[u|m]d_offset(pgd,addr)
493 #if CONFIG_PGTABLE_LEVELS == 4
494 (p7) ld8 r17=[r17] // get *pud (may be 0)
495 shr.u r18=r22,PMD_SHIFT // shift pmd index into position
497 (p7) cmp.eq.or.andcm p6,p7=r17,r0 // was pud_present(*pud) == NULL?
498 dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=pmd_offset(pud,addr)
501 (p7) ld8 r17=[r17] // get *pmd (may be 0)
502 shr.u r19=r22,PAGE_SHIFT // shift pte index into position
504 (p7) cmp.eq.or.andcm p6,p7=r17,r0 // was pmd_present(*pmd) == NULL?
505 dep r17=r19,r17,3,(PAGE_SHIFT-3) // r17=pte_offset(pmd,addr);
506 (p6) br.cond.spnt page_fault
508 br.sptk.many b0 // return to continuation point
509 END(nested_dtlb_miss)
512 /////////////////////////////////////////////////////////////////////////////////////////
513 // 0x1800 Entry 6 (size 64 bundles) Instruction Key Miss (24)
520 /////////////////////////////////////////////////////////////////////////////////////////
521 // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
528 /////////////////////////////////////////////////////////////////////////////////////////
529 // 0x2000 Entry 8 (size 64 bundles) Dirty-bit (54)
533 * What we do here is to simply turn on the dirty bit in the PTE. We need to
534 * update both the page-table and the TLB entry. To efficiently access the PTE,
535 * we address it through the virtual page table. Most likely, the TLB entry for
536 * the relevant virtual page table page is still present in the TLB so we can
537 * normally do this without additional TLB misses. In case the necessary virtual
538 * page table TLB entry isn't present, we take a nested TLB miss hit where we look
539 * up the physical address of the L3 PTE and then continue at label 1 below.
541 MOV_FROM_IFA(r16) // get the address that caused the fault
542 movl r30=1f // load continuation point in case of nested fault
544 THASH(p0, r17, r16, r18) // compute virtual address of L3 PTE
545 mov r29=b0 // save b0 in case of nested fault
546 mov r31=pr // save pr
548 mov r28=ar.ccv // save ar.ccv
551 ;; // avoid RAW on r18
552 mov ar.ccv=r18 // set compare value for cmpxchg
553 or r25=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
554 tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
556 (p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only update if page is present
557 mov r24=PAGE_SHIFT<<2
559 (p6) cmp.eq p6,p7=r26,r18 // Only compare if page is present
561 ITC_D(p6, r25, r18) // install updated PTE
564 * Tell the assemblers dependency-violation checker that the above "itc" instructions
565 * cannot possibly affect the following loads:
569 ld8 r18=[r17] // read PTE again
571 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
574 mov b0=r29 // restore b0
579 ;; // avoid RAW on r18
580 or r18=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
581 mov b0=r29 // restore b0
583 st8 [r17]=r18 // store back updated PTE
584 ITC_D(p0, r18, r16) // install updated PTE
586 mov pr=r31,-1 // restore pr
591 /////////////////////////////////////////////////////////////////////////////////////////
592 // 0x2400 Entry 9 (size 64 bundles) Instruction Access-bit (27)
595 // Like Entry 8, except for instruction access
596 MOV_FROM_IFA(r16) // get the address that caused the fault
597 movl r30=1f // load continuation point in case of nested fault
598 mov r31=pr // save predicates
599 #ifdef CONFIG_ITANIUM
601 * Erratum 10 (IFA may contain incorrect address) has "NoFix" status.
603 MOV_FROM_IPSR(p0, r17)
606 tbit.z p6,p0=r17,IA64_PSR_IS_BIT // IA64 instruction set?
608 (p6) mov r16=r18 // if so, use cr.iip instead of cr.ifa
609 #endif /* CONFIG_ITANIUM */
611 THASH(p0, r17, r16, r18) // compute virtual address of L3 PTE
612 mov r29=b0 // save b0 in case of nested fault)
614 mov r28=ar.ccv // save ar.ccv
618 mov ar.ccv=r18 // set compare value for cmpxchg
619 or r25=_PAGE_A,r18 // set the accessed bit
620 tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
622 (p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only if page present
623 mov r24=PAGE_SHIFT<<2
625 (p6) cmp.eq p6,p7=r26,r18 // Only if page present
627 ITC_I(p6, r25, r26) // install updated PTE
630 * Tell the assemblers dependency-violation checker that the above "itc" instructions
631 * cannot possibly affect the following loads:
635 ld8 r18=[r17] // read PTE again
637 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
640 mov b0=r29 // restore b0
642 #else /* !CONFIG_SMP */
646 or r18=_PAGE_A,r18 // set the accessed bit
647 mov b0=r29 // restore b0
649 st8 [r17]=r18 // store back updated PTE
650 ITC_I(p0, r18, r16) // install updated PTE
651 #endif /* !CONFIG_SMP */
657 /////////////////////////////////////////////////////////////////////////////////////////
658 // 0x2800 Entry 10 (size 64 bundles) Data Access-bit (15,55)
661 // Like Entry 8, except for data access
662 MOV_FROM_IFA(r16) // get the address that caused the fault
663 movl r30=1f // load continuation point in case of nested fault
665 THASH(p0, r17, r16, r18) // compute virtual address of L3 PTE
667 mov r29=b0 // save b0 in case of nested fault)
669 mov r28=ar.ccv // save ar.ccv
672 ;; // avoid RAW on r18
673 mov ar.ccv=r18 // set compare value for cmpxchg
674 or r25=_PAGE_A,r18 // set the dirty bit
675 tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
677 (p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only if page is present
678 mov r24=PAGE_SHIFT<<2
680 (p6) cmp.eq p6,p7=r26,r18 // Only if page is present
682 ITC_D(p6, r25, r26) // install updated PTE
684 * Tell the assemblers dependency-violation checker that the above "itc" instructions
685 * cannot possibly affect the following loads:
689 ld8 r18=[r17] // read PTE again
691 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
698 ;; // avoid RAW on r18
699 or r18=_PAGE_A,r18 // set the accessed bit
701 st8 [r17]=r18 // store back updated PTE
702 ITC_D(p0, r18, r16) // install updated PTE
704 mov b0=r29 // restore b0
710 /////////////////////////////////////////////////////////////////////////////////////////
711 // 0x2c00 Entry 11 (size 64 bundles) Break instruction (33)
714 * The streamlined system call entry/exit paths only save/restore the initial part
715 * of pt_regs. This implies that the callers of system-calls must adhere to the
716 * normal procedure calling conventions.
718 * Registers to be saved & restored:
719 * CR registers: cr.ipsr, cr.iip, cr.ifs
720 * AR registers: ar.unat, ar.pfs, ar.rsc, ar.rnat, ar.bspstore, ar.fpsr
721 * others: pr, b0, b6, loadrs, r1, r11, r12, r13, r15
722 * Registers to be restored only:
723 * r8-r11: output value from the system call.
725 * During system call exit, scratch registers (including r15) are modified/cleared
726 * to prevent leaking bits from kernel to user level.
729 mov.m r16=IA64_KR(CURRENT) // M2 r16 <- current task (12 cyc)
730 MOV_FROM_IPSR(p0, r29) // M2 (12 cyc)
731 mov r31=pr // I0 (2 cyc)
733 MOV_FROM_IIM(r17) // M2 (2 cyc)
734 mov.m r27=ar.rsc // M2 (12 cyc)
735 mov r18=__IA64_BREAK_SYSCALL // A
738 mov.m r21=ar.fpsr // M2 (12 cyc)
739 mov r19=b6 // I0 (2 cyc)
741 mov.m r23=ar.bspstore // M2 (12 cyc)
742 mov.m r24=ar.rnat // M2 (5 cyc)
743 mov.i r26=ar.pfs // I0 (2 cyc)
747 mov r20=r1 // A save r1
750 movl r30=sys_call_table // X
752 MOV_FROM_IIP(r28) // M2 (2 cyc)
753 cmp.eq p0,p7=r18,r17 // I0 is this a system call?
754 (p7) br.cond.spnt non_syscall // B no ->
756 // From this point on, we are definitely on the syscall-path
757 // and we can use (non-banked) scratch registers.
759 ///////////////////////////////////////////////////////////////////////
760 mov r1=r16 // A move task-pointer to "addl"-addressable reg
761 mov r2=r16 // A setup r2 for ia64_syscall_setup
762 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 // A r9 = ¤t_thread_info()->flags
764 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
765 adds r15=-1024,r15 // A subtract 1024 from syscall number
766 mov r3=NR_syscalls - 1
768 ld1.bias r17=[r16] // M0|1 r17 = current->thread.on_ustack flag
769 ld4 r9=[r9] // M0|1 r9 = current_thread_info()->flags
770 extr.u r8=r29,41,2 // I0 extract ei field from cr.ipsr
772 shladd r30=r15,3,r30 // A r30 = sys_call_table + 8*(syscall-1024)
773 addl r22=IA64_RBS_OFFSET,r1 // A compute base of RBS
774 cmp.leu p6,p7=r15,r3 // A syscall number in range?
777 lfetch.fault.excl.nt1 [r22] // M0|1 prefetch RBS
778 (p6) ld8 r30=[r30] // M0|1 load address of syscall entry point
779 tnat.nz.or p7,p0=r15 // I0 is syscall nr a NaT?
781 mov.m ar.bspstore=r22 // M2 switch to kernel RBS
782 cmp.eq p8,p9=2,r8 // A isr.ei==2?
785 (p8) mov r8=0 // A clear ei to 0
786 (p7) movl r30=sys_ni_syscall // X
788 (p8) adds r28=16,r28 // A switch cr.iip to next bundle
789 (p9) adds r8=1,r8 // A increment ei to next slot
790 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
792 mov b6=r30 // I0 setup syscall handler branch reg early
798 mov.m r25=ar.unat // M2 (5 cyc)
799 dep r29=r8,r29,41,2 // I0 insert new ei into cr.ipsr
800 adds r15=1024,r15 // A restore original syscall number
802 // If any of the above loads miss in L1D, we'll stall here until
805 ///////////////////////////////////////////////////////////////////////
806 st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag
807 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
808 MOV_FROM_ITC(p0, p14, r30, r18) // M get cycle for accounting
810 mov b6=r30 // I0 setup syscall handler branch reg early
812 cmp.eq pKStk,pUStk=r0,r17 // A were we on kernel stacks already?
814 and r9=_TIF_SYSCALL_TRACEAUDIT,r9 // A mask trace or audit
815 mov r18=ar.bsp // M2 (12 cyc)
816 (pKStk) br.cond.spnt .break_fixup // B we're already in kernel-mode -- fix up RBS
818 .back_from_break_fixup:
819 (pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1 // A compute base of memory stack
820 cmp.eq p14,p0=r9,r0 // A are syscalls being traced/audited?
821 br.call.sptk.many b7=ia64_syscall_setup // B
823 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
824 // mov.m r30=ar.itc is called in advance, and r13 is current
825 add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13 // A
826 add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13 // A
827 (pKStk) br.cond.spnt .skip_accounting // B unlikely skip
829 ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // M get last stamp
830 ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // M time at leave
832 ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME // M cumulated stime
833 ld8 r21=[r17] // M cumulated utime
834 sub r22=r19,r18 // A stime before leave
836 st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP // M update stamp
837 sub r18=r30,r19 // A elapsed time in user
839 add r20=r20,r22 // A sum stime
840 add r21=r21,r18 // A sum utime
842 st8 [r16]=r20 // M update stime
843 st8 [r17]=r21 // M update utime
847 mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0
849 BSW_1(r2, r14) // B (6 cyc) regs are saved, switch to bank 1
852 SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r16) // M2 now it's safe to re-enable intr.-collection
853 // M0 ensure interruption collection is on
854 movl r3=ia64_ret_from_syscall // X
856 mov rp=r3 // I0 set the real return addr
857 (p10) br.cond.spnt.many ia64_ret_from_syscall // B return if bad call-frame or r15 is a NaT
859 SSM_PSR_I(p15, p15, r16) // M2 restore psr.i
860 (p14) br.call.sptk.many b6=b6 // B invoke syscall-handker (ignore return addr)
861 br.cond.spnt.many ia64_trace_syscall // B do syscall-tracing thingamagic
863 ///////////////////////////////////////////////////////////////////////
864 // On entry, we optimistically assumed that we're coming from user-space.
865 // For the rare cases where a system-call is done from within the kernel,
866 // we fix things up at this point:
868 add r1=-IA64_PT_REGS_SIZE,sp // A allocate space for pt_regs structure
869 mov ar.rnat=r24 // M2 restore kernel's AR.RNAT
871 mov ar.bspstore=r23 // M2 restore kernel's AR.BSPSTORE
872 br.cond.sptk .back_from_break_fixup
876 /////////////////////////////////////////////////////////////////////////////////////////
877 // 0x3000 Entry 12 (size 64 bundles) External Interrupt (4)
879 /* interrupt handler has become too big to fit this area. */
880 br.sptk.many __interrupt
884 /////////////////////////////////////////////////////////////////////////////////////////
885 // 0x3400 Entry 13 (size 64 bundles) Reserved
890 /////////////////////////////////////////////////////////////////////////////////////////
891 // 0x3800 Entry 14 (size 64 bundles) Reserved
896 * There is no particular reason for this code to be here, other than that
897 * there happens to be space here that would go unused otherwise. If this
898 * fault ever gets "unreserved", simply moved the following code to a more
901 * ia64_syscall_setup() is a separate subroutine so that it can
902 * allocate stacked registers so it can safely demine any
903 * potential NaT values from the input registers.
906 * - executing on bank 0 or bank 1 register set (doesn't matter)
907 * - r1: stack pointer
908 * - r2: current task pointer
910 * - r11: original contents (saved ar.pfs to be saved)
911 * - r12: original contents (sp to be saved)
912 * - r13: original contents (tp to be saved)
913 * - r15: original contents (syscall # to be saved)
914 * - r18: saved bsp (after switching to kernel stack)
916 * - r20: saved r1 (gp)
917 * - r21: saved ar.fpsr
918 * - r22: kernel's register backing store base (krbs_base)
919 * - r23: saved ar.bspstore
920 * - r24: saved ar.rnat
921 * - r25: saved ar.unat
922 * - r26: saved ar.pfs
923 * - r27: saved ar.rsc
924 * - r28: saved cr.iip
925 * - r29: saved cr.ipsr
926 * - r30: ar.itc for accounting (don't touch)
928 * - b0: original contents (to be saved)
930 * - p10: TRUE if syscall is invoked with more than 8 out
931 * registers or r15's Nat is true
933 * - r3: preserved (same as on entry)
934 * - r8: -EINVAL if p10 is true
935 * - r12: points to kernel stack
936 * - r13: points to current task
937 * - r14: preserved (same as on entry)
939 * - p15: TRUE if interrupts need to be re-enabled
940 * - ar.fpsr: set to kernel settings
941 * - b6: preserved (same as on entry)
943 GLOBAL_ENTRY(ia64_syscall_setup)
945 # error This code assumes that b6 is the first field in pt_regs.
947 st8 [r1]=r19 // save b6
948 add r16=PT(CR_IPSR),r1 // initialize first base pointer
949 add r17=PT(R11),r1 // initialize second base pointer
951 alloc r19=ar.pfs,8,0,0,0 // ensure in0-in7 are writable
952 st8 [r16]=r29,PT(AR_PFS)-PT(CR_IPSR) // save cr.ipsr
955 st8.spill [r17]=r11,PT(CR_IIP)-PT(R11) // save r11
957 (pKStk) mov r18=r0 // make sure r18 isn't NaT
960 st8 [r16]=r26,PT(CR_IFS)-PT(AR_PFS) // save ar.pfs
961 st8 [r17]=r28,PT(AR_UNAT)-PT(CR_IIP) // save cr.iip
962 mov r28=b0 // save b0 (2 cyc)
965 st8 [r17]=r25,PT(AR_RSC)-PT(AR_UNAT) // save ar.unat
966 dep r19=0,r19,38,26 // clear all bits but 0..37 [I0]
970 st8 [r16]=r19,PT(AR_RNAT)-PT(CR_IFS) // store ar.pfs.pfm in cr.ifs
971 extr.u r11=r19,7,7 // I0 // get sol of ar.pfs
972 and r8=0x7f,r19 // A // get sof of ar.pfs
974 st8 [r17]=r27,PT(AR_BSPSTORE)-PT(AR_RSC)// save ar.rsc
975 tbit.nz p15,p0=r29,IA64_PSR_I_BIT // I0
979 (pUStk) sub r18=r18,r22 // r18=RSE.ndirty*8
983 (pKStk) adds r16=PT(PR)-PT(AR_RNAT),r16 // skip over ar_rnat field
984 (pKStk) adds r17=PT(B0)-PT(AR_BSPSTORE),r17 // skip over ar_bspstore field
988 tnat.nz p12,p0=in4 // [I0]
991 (pUStk) st8 [r16]=r24,PT(PR)-PT(AR_RNAT) // save ar.rnat
992 (pUStk) st8 [r17]=r23,PT(B0)-PT(AR_BSPSTORE) // save ar.bspstore
993 shl r18=r18,16 // compute ar.rsc to be used for "loadrs"
995 st8 [r16]=r31,PT(LOADRS)-PT(PR) // save predicates
996 st8 [r17]=r28,PT(R1)-PT(B0) // save b0
997 tnat.nz p13,p0=in5 // [I0]
999 st8 [r16]=r18,PT(R12)-PT(LOADRS) // save ar.rsc value for "loadrs"
1000 st8.spill [r17]=r20,PT(R13)-PT(R1) // save original r1
1004 .mem.offset 0,0; st8.spill [r16]=r12,PT(AR_FPSR)-PT(R12) // save r12
1005 .mem.offset 8,0; st8.spill [r17]=r13,PT(R15)-PT(R13) // save r13
1008 st8 [r16]=r21,PT(R8)-PT(AR_FPSR) // save ar.fpsr
1010 cmp.lt p10,p9=r11,r8 // frame size can't be more than local+8
1013 (p9) tnat.nz p10,p0=r15
1014 adds r12=-16,r1 // switch to kernel memory stack (with 16 bytes of scratch)
1016 st8.spill [r17]=r15 // save r15
1020 mov r13=r2 // establish `current'
1021 movl r1=__gp // establish kernel global pointer
1023 st8 [r16]=r8 // ensure pt_regs.r8 != 0 (see handle_syscall_error)
1027 cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
1028 movl r17=FPSR_DEFAULT
1030 mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
1031 (p10) mov r8=-EINVAL
1033 END(ia64_syscall_setup)
1035 .org ia64_ivt+0x3c00
1036 /////////////////////////////////////////////////////////////////////////////////////////
1037 // 0x3c00 Entry 15 (size 64 bundles) Reserved
1041 .org ia64_ivt+0x4000
1042 /////////////////////////////////////////////////////////////////////////////////////////
1043 // 0x4000 Entry 16 (size 64 bundles) Reserved
1047 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE)
1049 * There is no particular reason for this code to be here, other than
1050 * that there happens to be space here that would go unused otherwise.
1051 * If this fault ever gets "unreserved", simply moved the following
1052 * code to a more suitable spot...
1054 * account_sys_enter is called from SAVE_MIN* macros if accounting is
1055 * enabled and if the macro is entered from user mode.
1057 GLOBAL_ENTRY(account_sys_enter)
1058 // mov.m r20=ar.itc is called in advance, and r13 is current
1059 add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13
1060 add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13
1062 ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel
1063 ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at left from kernel
1065 ld8 r23=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime
1066 ld8 r21=[r17] // cumulated utime
1067 sub r22=r19,r18 // stime before leave kernel
1069 st8 [r16]=r20,TI_AC_STIME-TI_AC_STAMP // update stamp
1070 sub r18=r20,r19 // elapsed time in user mode
1072 add r23=r23,r22 // sum stime
1073 add r21=r21,r18 // sum utime
1075 st8 [r16]=r23 // update stime
1076 st8 [r17]=r21 // update utime
1079 END(account_sys_enter)
1082 .org ia64_ivt+0x4400
1083 /////////////////////////////////////////////////////////////////////////////////////////
1084 // 0x4400 Entry 17 (size 64 bundles) Reserved
1088 .org ia64_ivt+0x4800
1089 /////////////////////////////////////////////////////////////////////////////////////////
1090 // 0x4800 Entry 18 (size 64 bundles) Reserved
1094 .org ia64_ivt+0x4c00
1095 /////////////////////////////////////////////////////////////////////////////////////////
1096 // 0x4c00 Entry 19 (size 64 bundles) Reserved
1101 // --- End of long entries, Beginning of short entries
1104 .org ia64_ivt+0x5000
1105 /////////////////////////////////////////////////////////////////////////////////////////
1106 // 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
1107 ENTRY(page_not_present)
1112 * The Linux page fault handler doesn't expect non-present pages to be in
1113 * the TLB. Flush the existing entry now, so we meet that expectation.
1115 mov r17=PAGE_SHIFT<<2
1121 br.sptk.many page_fault
1122 END(page_not_present)
1124 .org ia64_ivt+0x5100
1125 /////////////////////////////////////////////////////////////////////////////////////////
1126 // 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
1127 ENTRY(key_permission)
1134 br.sptk.many page_fault
1137 .org ia64_ivt+0x5200
1138 /////////////////////////////////////////////////////////////////////////////////////////
1139 // 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
1140 ENTRY(iaccess_rights)
1147 br.sptk.many page_fault
1150 .org ia64_ivt+0x5300
1151 /////////////////////////////////////////////////////////////////////////////////////////
1152 // 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
1153 ENTRY(daccess_rights)
1160 br.sptk.many page_fault
1163 .org ia64_ivt+0x5400
1164 /////////////////////////////////////////////////////////////////////////////////////////
1165 // 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
1166 ENTRY(general_exception)
1172 (p6) br.sptk.many dispatch_illegal_op_fault
1174 mov r19=24 // fault number
1175 br.sptk.many dispatch_to_fault_handler
1176 END(general_exception)
1178 .org ia64_ivt+0x5500
1179 /////////////////////////////////////////////////////////////////////////////////////////
1180 // 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35)
1181 ENTRY(disabled_fp_reg)
1183 rsm psr.dfh // ensure we can access fph
1188 br.sptk.many dispatch_to_fault_handler
1189 END(disabled_fp_reg)
1191 .org ia64_ivt+0x5600
1192 /////////////////////////////////////////////////////////////////////////////////////////
1193 // 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50)
1194 ENTRY(nat_consumption)
1197 MOV_FROM_IPSR(p0, r16)
1199 mov r31=pr // save PR
1201 and r18=0xf,r17 // r18 = cr.ipsr.code{3:0}
1202 tbit.z p6,p0=r17,IA64_ISR_NA_BIT
1204 cmp.ne.or p6,p0=IA64_ISR_CODE_LFETCH,r18
1205 dep r16=-1,r16,IA64_PSR_ED_BIT,1
1206 (p6) br.cond.spnt 1f // branch if (cr.ispr.na == 0 || cr.ipsr.code{3:0} != LFETCH)
1208 MOV_TO_IPSR(p0, r16, r18)
1216 END(nat_consumption)
1218 .org ia64_ivt+0x5700
1219 /////////////////////////////////////////////////////////////////////////////////////////
1220 // 0x5700 Entry 27 (size 16 bundles) Speculation (40)
1221 ENTRY(speculation_vector)
1224 * A [f]chk.[as] instruction needs to take the branch to the recovery code but
1225 * this part of the architecture is not implemented in hardware on some CPUs, such
1226 * as Itanium. Thus, in general we need to emulate the behavior. IIM contains
1227 * the relative target (not yet sign extended). So after sign extending it we
1228 * simply add it to IIP. We also need to reset the EI field of the IPSR to zero,
1229 * i.e., the slot to restart into.
1231 * cr.imm contains zero_ext(imm21)
1236 shl r18=r18,43 // put sign bit in position (43=64-21)
1239 MOV_FROM_IPSR(p0, r16)
1240 shr r18=r18,39 // sign extend (39=43-4)
1243 add r17=r17,r18 // now add the offset
1245 MOV_TO_IIP(r17, r19)
1246 dep r16=0,r16,41,2 // clear EI
1249 MOV_TO_IPSR(p0, r16, r19)
1253 END(speculation_vector)
1255 .org ia64_ivt+0x5800
1256 /////////////////////////////////////////////////////////////////////////////////////////
1257 // 0x5800 Entry 28 (size 16 bundles) Reserved
1261 .org ia64_ivt+0x5900
1262 /////////////////////////////////////////////////////////////////////////////////////////
1263 // 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
1269 .org ia64_ivt+0x5a00
1270 /////////////////////////////////////////////////////////////////////////////////////////
1271 // 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57)
1272 ENTRY(unaligned_access)
1274 mov r31=pr // prepare to save predicates
1276 br.sptk.many dispatch_unaligned_handler
1277 END(unaligned_access)
1279 .org ia64_ivt+0x5b00
1280 /////////////////////////////////////////////////////////////////////////////////////////
1281 // 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57)
1282 ENTRY(unsupported_data_reference)
1285 END(unsupported_data_reference)
1287 .org ia64_ivt+0x5c00
1288 /////////////////////////////////////////////////////////////////////////////////////////
1289 // 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64)
1290 ENTRY(floating_point_fault)
1293 END(floating_point_fault)
1295 .org ia64_ivt+0x5d00
1296 /////////////////////////////////////////////////////////////////////////////////////////
1297 // 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66)
1298 ENTRY(floating_point_trap)
1301 END(floating_point_trap)
1303 .org ia64_ivt+0x5e00
1304 /////////////////////////////////////////////////////////////////////////////////////////
1305 // 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Transfer Trap (66)
1306 ENTRY(lower_privilege_trap)
1309 END(lower_privilege_trap)
1311 .org ia64_ivt+0x5f00
1312 /////////////////////////////////////////////////////////////////////////////////////////
1313 // 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68)
1314 ENTRY(taken_branch_trap)
1317 END(taken_branch_trap)
1319 .org ia64_ivt+0x6000
1320 /////////////////////////////////////////////////////////////////////////////////////////
1321 // 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69)
1322 ENTRY(single_step_trap)
1325 END(single_step_trap)
1327 .org ia64_ivt+0x6100
1328 /////////////////////////////////////////////////////////////////////////////////////////
1329 // 0x6100 Entry 37 (size 16 bundles) Reserved
1333 .org ia64_ivt+0x6200
1334 /////////////////////////////////////////////////////////////////////////////////////////
1335 // 0x6200 Entry 38 (size 16 bundles) Reserved
1339 .org ia64_ivt+0x6300
1340 /////////////////////////////////////////////////////////////////////////////////////////
1341 // 0x6300 Entry 39 (size 16 bundles) Reserved
1345 .org ia64_ivt+0x6400
1346 /////////////////////////////////////////////////////////////////////////////////////////
1347 // 0x6400 Entry 40 (size 16 bundles) Reserved
1351 .org ia64_ivt+0x6500
1352 /////////////////////////////////////////////////////////////////////////////////////////
1353 // 0x6500 Entry 41 (size 16 bundles) Reserved
1357 .org ia64_ivt+0x6600
1358 /////////////////////////////////////////////////////////////////////////////////////////
1359 // 0x6600 Entry 42 (size 16 bundles) Reserved
1363 .org ia64_ivt+0x6700
1364 /////////////////////////////////////////////////////////////////////////////////////////
1365 // 0x6700 Entry 43 (size 16 bundles) Reserved
1369 .org ia64_ivt+0x6800
1370 /////////////////////////////////////////////////////////////////////////////////////////
1371 // 0x6800 Entry 44 (size 16 bundles) Reserved
1375 .org ia64_ivt+0x6900
1376 /////////////////////////////////////////////////////////////////////////////////////////
1377 // 0x6900 Entry 45 (size 16 bundles) IA-32 Exeception (17,18,29,41,42,43,44,58,60,61,62,72,73,75,76,77)
1378 ENTRY(ia32_exception)
1383 .org ia64_ivt+0x6a00
1384 /////////////////////////////////////////////////////////////////////////////////////////
1385 // 0x6a00 Entry 46 (size 16 bundles) IA-32 Intercept (30,31,59,70,71)
1386 ENTRY(ia32_intercept)
1391 .org ia64_ivt+0x6b00
1392 /////////////////////////////////////////////////////////////////////////////////////////
1393 // 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt (74)
1394 ENTRY(ia32_interrupt)
1399 .org ia64_ivt+0x6c00
1400 /////////////////////////////////////////////////////////////////////////////////////////
1401 // 0x6c00 Entry 48 (size 16 bundles) Reserved
1405 .org ia64_ivt+0x6d00
1406 /////////////////////////////////////////////////////////////////////////////////////////
1407 // 0x6d00 Entry 49 (size 16 bundles) Reserved
1411 .org ia64_ivt+0x6e00
1412 /////////////////////////////////////////////////////////////////////////////////////////
1413 // 0x6e00 Entry 50 (size 16 bundles) Reserved
1417 .org ia64_ivt+0x6f00
1418 /////////////////////////////////////////////////////////////////////////////////////////
1419 // 0x6f00 Entry 51 (size 16 bundles) Reserved
1423 .org ia64_ivt+0x7000
1424 /////////////////////////////////////////////////////////////////////////////////////////
1425 // 0x7000 Entry 52 (size 16 bundles) Reserved
1429 .org ia64_ivt+0x7100
1430 /////////////////////////////////////////////////////////////////////////////////////////
1431 // 0x7100 Entry 53 (size 16 bundles) Reserved
1435 .org ia64_ivt+0x7200
1436 /////////////////////////////////////////////////////////////////////////////////////////
1437 // 0x7200 Entry 54 (size 16 bundles) Reserved
1441 .org ia64_ivt+0x7300
1442 /////////////////////////////////////////////////////////////////////////////////////////
1443 // 0x7300 Entry 55 (size 16 bundles) Reserved
1447 .org ia64_ivt+0x7400
1448 /////////////////////////////////////////////////////////////////////////////////////////
1449 // 0x7400 Entry 56 (size 16 bundles) Reserved
1453 .org ia64_ivt+0x7500
1454 /////////////////////////////////////////////////////////////////////////////////////////
1455 // 0x7500 Entry 57 (size 16 bundles) Reserved
1459 .org ia64_ivt+0x7600
1460 /////////////////////////////////////////////////////////////////////////////////////////
1461 // 0x7600 Entry 58 (size 16 bundles) Reserved
1465 .org ia64_ivt+0x7700
1466 /////////////////////////////////////////////////////////////////////////////////////////
1467 // 0x7700 Entry 59 (size 16 bundles) Reserved
1471 .org ia64_ivt+0x7800
1472 /////////////////////////////////////////////////////////////////////////////////////////
1473 // 0x7800 Entry 60 (size 16 bundles) Reserved
1477 .org ia64_ivt+0x7900
1478 /////////////////////////////////////////////////////////////////////////////////////////
1479 // 0x7900 Entry 61 (size 16 bundles) Reserved
1483 .org ia64_ivt+0x7a00
1484 /////////////////////////////////////////////////////////////////////////////////////////
1485 // 0x7a00 Entry 62 (size 16 bundles) Reserved
1489 .org ia64_ivt+0x7b00
1490 /////////////////////////////////////////////////////////////////////////////////////////
1491 // 0x7b00 Entry 63 (size 16 bundles) Reserved
1495 .org ia64_ivt+0x7c00
1496 /////////////////////////////////////////////////////////////////////////////////////////
1497 // 0x7c00 Entry 64 (size 16 bundles) Reserved
1501 .org ia64_ivt+0x7d00
1502 /////////////////////////////////////////////////////////////////////////////////////////
1503 // 0x7d00 Entry 65 (size 16 bundles) Reserved
1507 .org ia64_ivt+0x7e00
1508 /////////////////////////////////////////////////////////////////////////////////////////
1509 // 0x7e00 Entry 66 (size 16 bundles) Reserved
1513 .org ia64_ivt+0x7f00
1514 /////////////////////////////////////////////////////////////////////////////////////////
1515 // 0x7f00 Entry 67 (size 16 bundles) Reserved
1519 //-----------------------------------------------------------------------------------
1520 // call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
1522 SSM_PSR_DT_AND_SRLZ_I
1525 alloc r15=ar.pfs,0,0,3,0
1528 SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r14, r3)
1529 adds r3=8,r2 // set up second base pointer
1530 SSM_PSR_I(p15, p15, r14) // restore psr.i
1531 movl r14=ia64_leave_kernel
1536 adds out2=16,r12 // out2 = pointer to pt_regs
1537 br.call.sptk.many b6=ia64_do_page_fault // ignore return address
1541 mov ar.rsc=r27 // restore ar.rsc before SAVE_MIN_WITH_COVER
1545 // There is no particular reason for this code to be here, other than that
1546 // there happens to be space here that would go unused otherwise. If this
1547 // fault ever gets "unreserved", simply moved the following code to a more
1550 alloc r14=ar.pfs,0,0,2,0
1553 adds r3=8,r2 // set up second base pointer for SAVE_REST
1555 SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r15, r24)
1556 // guarantee that interruption collection is on
1557 SSM_PSR_I(p15, p15, r15) // restore psr.i
1558 movl r15=ia64_leave_kernel
1563 br.call.sptk.many b6=ia64_bad_break // avoid WAW on CFM and ignore return addr
1568 mov r31=pr // prepare to save predicates
1570 SAVE_MIN_WITH_COVER // uses r31; defines r2 and r3
1571 SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r14)
1572 // ensure everybody knows psr.ic is back on
1573 adds r3=8,r2 // set up second base pointer for SAVE_REST
1577 MCA_RECOVER_RANGE(interrupt)
1578 alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
1579 MOV_FROM_IVR(out0, r8) // pass cr.ivr as first arg
1580 add out1=16,sp // pass pointer to pt_regs as second arg
1582 srlz.d // make sure we see the effect of cr.ivr
1583 movl r14=ia64_leave_kernel
1586 br.call.sptk.many b6=ia64_handle_irq
1590 * There is no particular reason for this code to be here, other than that
1591 * there happens to be space here that would go unused otherwise. If this
1592 * fault ever gets "unreserved", simply moved the following code to a more
1596 ENTRY(dispatch_unaligned_handler)
1599 alloc r14=ar.pfs,0,0,2,0 // now it's safe (must be first in insn group!)
1603 SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
1604 // guarantee that interruption collection is on
1605 SSM_PSR_I(p15, p15, r3) // restore psr.i
1606 adds r3=8,r2 // set up second base pointer
1609 movl r14=ia64_leave_kernel
1612 br.sptk.many ia64_prepare_handle_unaligned
1613 END(dispatch_unaligned_handler)
1616 * There is no particular reason for this code to be here, other than that
1617 * there happens to be space here that would go unused otherwise. If this
1618 * fault ever gets "unreserved", simply moved the following code to a more
1622 ENTRY(dispatch_to_fault_handler)
1626 * r19: fault vector number (e.g., 24 for General Exception)
1627 * r31: contains saved predicates (pr)
1629 SAVE_MIN_WITH_COVER_R19
1630 alloc r14=ar.pfs,0,0,5,0
1636 SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, out0)
1637 // guarantee that interruption collection is on
1640 SSM_PSR_I(p15, p15, r3) // restore psr.i
1641 adds r3=8,r2 // set up second base pointer for SAVE_REST
1644 movl r14=ia64_leave_kernel
1647 br.call.sptk.many b6=ia64_fault
1648 END(dispatch_to_fault_handler)
1651 * Squatting in this space ...
1653 * This special case dispatcher for illegal operation faults allows preserved
1654 * registers to be modified through a callback function (asm only) that is handed
1655 * back from the fault handler in r8. Up to three arguments can be passed to the
1656 * callback function by returning an aggregate with the callback as its first
1657 * element, followed by the arguments.
1659 ENTRY(dispatch_illegal_op_fault)
1663 SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
1664 // guarantee that interruption collection is on
1666 SSM_PSR_I(p15, p15, r3) // restore psr.i
1667 adds r3=8,r2 // set up second base pointer for SAVE_REST
1669 alloc r14=ar.pfs,0,0,1,0 // must be first in insn group
1673 PT_REGS_UNWIND_INFO(0)
1675 br.call.sptk.many rp=ia64_illegal_op_fault
1677 alloc r14=ar.pfs,0,0,3,0 // must be first in insn group
1681 movl r15=ia64_leave_kernel
1687 (p6) br.call.dpnt.many b6=b6 // call returns to ia64_leave_kernel
1688 br.sptk.many ia64_leave_kernel
1689 END(dispatch_illegal_op_fault)