2 * arch/ia64/kernel/ivt.S
4 * Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
5 * Stephane Eranian <eranian@hpl.hp.com>
6 * David Mosberger <davidm@hpl.hp.com>
7 * Copyright (C) 2000, 2002-2003 Intel Co
8 * Asit Mallick <asit.k.mallick@intel.com>
9 * Suresh Siddha <suresh.b.siddha@intel.com>
10 * Kenneth Chen <kenneth.w.chen@intel.com>
11 * Fenghua Yu <fenghua.yu@intel.com>
13 * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> TLB handling for SMP
14 * 00/12/20 David Mosberger-Tang <davidm@hpl.hp.com> DTLB/ITLB handler now uses virtual PT.
17 * This file defines the interruption vector table used by the CPU.
18 * It does not include one entry per possible cause of interruption.
20 * The first 20 entries of the table contain 64 bundles each while the
21 * remaining 48 entries contain only 16 bundles each.
23 * The 64 bundles are used to allow inlining the whole handler for critical
24 * interruptions like TLB misses.
26 * For each entry, the comment is as follows:
28 * // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
29 * entry offset ----/ / / / /
30 * entry number ---------/ / / /
31 * size of the entry -------------/ / /
32 * vector name -------------------------------------/ /
33 * interruptions triggering this vector ----------------------/
35 * The table is 32KB in size and must be aligned on 32KB boundary.
36 * (The CPU ignores the 15 lower bits of the address)
38 * Table is based upon EAS2.6 (Oct 1999)
41 #include <linux/config.h>
43 #include <asm/asmmacro.h>
44 #include <asm/break.h>
46 #include <asm/kregs.h>
47 #include <asm/asm-offsets.h>
48 #include <asm/pgtable.h>
49 #include <asm/processor.h>
50 #include <asm/ptrace.h>
51 #include <asm/system.h>
52 #include <asm/thread_info.h>
53 #include <asm/unistd.h>
54 #include <asm/errno.h>
57 # define PSR_DEFAULT_BITS psr.ac
59 # define PSR_DEFAULT_BITS 0
64 * This lets you track the last eight faults that occurred on the CPU. Make sure ar.k2 isn't
65 * needed for something else before enabling this...
67 # define DBG_FAULT(i) mov r16=ar.k2;; shl r16=r16,8;; add r16=(i),r16;;mov ar.k2=r16
76 mov r19=n;; /* prepare to save predicates */ \
77 br.sptk.many dispatch_to_fault_handler
79 .section .text.ivt,"ax"
81 .align 32768 // align on 32KB boundary
84 /////////////////////////////////////////////////////////////////////////////////////////
85 // 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)
89 * The VHPT vector is invoked when the TLB entry for the virtual page table
90 * is missing. This happens only as a result of a previous
91 * (the "original") TLB miss, which may either be caused by an instruction
92 * fetch or a data access (or non-access).
94 * What we do here is normal TLB miss handing for the _original_ miss,
95 * followed by inserting the TLB entry for the virtual page table page
96 * that the VHPT walker was attempting to access. The latter gets
97 * inserted as long as page table entry above pte level have valid
98 * mappings for the faulting address. The TLB entry for the original
99 * miss gets inserted only if the pte entry indicates that the page is
102 * do_page_fault gets invoked in the following cases:
103 * - the faulting virtual address uses unimplemented address bits
104 * - the faulting virtual address has no valid page table mapping
106 mov r16=cr.ifa // get address that caused the TLB miss
107 #ifdef CONFIG_HUGETLB_PAGE
112 rsm psr.dt // use physical addressing for data
113 mov r31=pr // save the predicate registers
114 mov r19=IA64_KR(PT_BASE) // get page table base address
115 shl r21=r16,3 // shift bit 60 into sign bit
116 shr.u r17=r16,61 // get the region number into r17
119 #ifdef CONFIG_HUGETLB_PAGE
125 (p8) dep r25=r18,r25,2,6
129 cmp.eq p6,p7=5,r17 // is IFA pointing into to region 5?
130 shr.u r18=r22,PGDIR_SHIFT // get bottom portion of pgd index bit
132 (p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
135 LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
137 .pred.rel "mutex", p6, p7
138 (p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
139 (p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
141 (p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=pgd_offset for region 5
142 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=pgd_offset for region[0-4]
143 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
144 #ifdef CONFIG_PGTABLE_4
145 shr.u r28=r22,PUD_SHIFT // shift pud index into position
147 shr.u r18=r22,PMD_SHIFT // shift pmd index into position
150 ld8 r17=[r17] // get *pgd (may be 0)
152 (p7) cmp.eq p6,p7=r17,r0 // was pgd_present(*pgd) == NULL?
153 #ifdef CONFIG_PGTABLE_4
154 dep r28=r28,r17,3,(PAGE_SHIFT-3) // r28=pud_offset(pgd,addr)
156 shr.u r18=r22,PMD_SHIFT // shift pmd index into position
157 (p7) ld8 r29=[r28] // get *pud (may be 0)
159 (p7) cmp.eq.or.andcm p6,p7=r29,r0 // was pud_present(*pud) == NULL?
160 dep r17=r18,r29,3,(PAGE_SHIFT-3) // r17=pmd_offset(pud,addr)
162 dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=pmd_offset(pgd,addr)
165 (p7) ld8 r20=[r17] // get *pmd (may be 0)
166 shr.u r19=r22,PAGE_SHIFT // shift pte index into position
168 (p7) cmp.eq.or.andcm p6,p7=r20,r0 // was pmd_present(*pmd) == NULL?
169 dep r21=r19,r20,3,(PAGE_SHIFT-3) // r21=pte_offset(pmd,addr)
171 (p7) ld8 r18=[r21] // read *pte
172 mov r19=cr.isr // cr.isr bit 32 tells us if this is an insn miss
174 (p7) tbit.z p6,p7=r18,_PAGE_P_BIT // page present bit cleared?
175 mov r22=cr.iha // get the VHPT address that caused the TLB miss
176 ;; // avoid RAW on p7
177 (p7) tbit.nz.unc p10,p11=r19,32 // is it an instruction TLB miss?
178 dep r23=0,r20,0,PAGE_SHIFT // clear low bits to get page address
180 (p10) itc.i r18 // insert the instruction TLB entry
181 (p11) itc.d r18 // insert the data TLB entry
182 (p6) br.cond.spnt.many page_fault // handle bad address/page not present (page fault)
185 #ifdef CONFIG_HUGETLB_PAGE
186 (p8) mov cr.itir=r25 // change to default page-size for VHPT
190 * Now compute and insert the TLB entry for the virtual page table. We never
191 * execute in a page table page so there is no need to set the exception deferral
194 adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
200 * Tell the assemblers dependency-violation checker that the above "itc" instructions
201 * cannot possibly affect the following loads:
206 * Re-check pagetable entry. If they changed, we may have received a ptc.g
207 * between reading the pagetable and the "itc". If so, flush the entry we
208 * inserted and retry. At this point, we have:
210 * r28 = equivalent of pud_offset(pgd, ifa)
211 * r17 = equivalent of pmd_offset(pud, ifa)
212 * r21 = equivalent of pte_offset(pmd, ifa)
218 ld8 r25=[r21] // read *pte again
219 ld8 r26=[r17] // read *pmd again
220 #ifdef CONFIG_PGTABLE_4
221 ld8 r19=[r28] // read *pud again
225 cmp.ne.or.andcm p6,p7=r26,r20 // did *pmd change
226 #ifdef CONFIG_PGTABLE_4
227 cmp.ne.or.andcm p6,p7=r19,r29 // did *pud change
229 mov r27=PAGE_SHIFT<<2
231 (p6) ptc.l r22,r27 // purge PTE page translation
232 (p7) cmp.ne.or.andcm p6,p7=r25,r18 // did *pte change
234 (p6) ptc.l r16,r27 // purge translation
237 mov pr=r31,-1 // restore predicate registers
242 /////////////////////////////////////////////////////////////////////////////////////////
243 // 0x0400 Entry 1 (size 64 bundles) ITLB (21)
247 * The ITLB handler accesses the PTE via the virtually mapped linear
248 * page table. If a nested TLB miss occurs, we switch into physical
249 * mode, walk the page table, and then re-execute the PTE read and
250 * go on normally after that.
252 mov r16=cr.ifa // get virtual address
253 mov r29=b0 // save b0
254 mov r31=pr // save predicates
256 mov r17=cr.iha // get virtual address of PTE
257 movl r30=1f // load nested fault continuation point
259 1: ld8 r18=[r17] // read *pte
262 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
263 (p6) br.cond.spnt page_fault
269 * Tell the assemblers dependency-violation checker that the above "itc" instructions
270 * cannot possibly affect the following loads:
274 ld8 r19=[r17] // read *pte again and see if same
275 mov r20=PAGE_SHIFT<<2 // setup page size for purge
286 /////////////////////////////////////////////////////////////////////////////////////////
287 // 0x0800 Entry 2 (size 64 bundles) DTLB (9,48)
291 * The DTLB handler accesses the PTE via the virtually mapped linear
292 * page table. If a nested TLB miss occurs, we switch into physical
293 * mode, walk the page table, and then re-execute the PTE read and
294 * go on normally after that.
296 mov r16=cr.ifa // get virtual address
297 mov r29=b0 // save b0
298 mov r31=pr // save predicates
300 mov r17=cr.iha // get virtual address of PTE
301 movl r30=1f // load nested fault continuation point
303 1: ld8 r18=[r17] // read *pte
306 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
307 (p6) br.cond.spnt page_fault
313 * Tell the assemblers dependency-violation checker that the above "itc" instructions
314 * cannot possibly affect the following loads:
318 ld8 r19=[r17] // read *pte again and see if same
319 mov r20=PAGE_SHIFT<<2 // setup page size for purge
330 /////////////////////////////////////////////////////////////////////////////////////////
331 // 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
334 mov r16=cr.ifa // get address that caused the TLB miss
337 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
340 #ifdef CONFIG_DISABLE_VHPT
341 shr.u r22=r16,61 // get the region number into r21
343 cmp.gt p8,p0=6,r22 // user mode
348 (p8) mov r29=b0 // save b0
349 (p8) br.cond.dptk .itlb_fault
351 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
352 and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
353 shr.u r18=r16,57 // move address bit 61 to bit 4
355 andcm r18=0x10,r18 // bit 4=~address-bit(61)
356 cmp.ne p8,p0=r0,r23 // psr.cpl != 0?
357 or r19=r17,r19 // insert PTE control bits into r19
359 or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
360 (p8) br.cond.spnt page_fault
362 itc.i r19 // insert the TLB entry
368 /////////////////////////////////////////////////////////////////////////////////////////
369 // 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
372 mov r16=cr.ifa // get address that caused the TLB miss
375 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
379 #ifdef CONFIG_DISABLE_VHPT
380 shr.u r22=r16,61 // get the region number into r21
382 cmp.gt p8,p0=6,r22 // access to region 0-5
387 (p8) mov r29=b0 // save b0
388 (p8) br.cond.dptk dtlb_fault
390 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
391 and r22=IA64_ISR_CODE_MASK,r20 // get the isr.code field
392 tbit.nz p6,p7=r20,IA64_ISR_SP_BIT // is speculation bit on?
393 shr.u r18=r16,57 // move address bit 61 to bit 4
394 and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
395 tbit.nz p9,p0=r20,IA64_ISR_NA_BIT // is non-access bit on?
397 andcm r18=0x10,r18 // bit 4=~address-bit(61)
399 (p9) cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22 // check isr.code field
400 (p8) br.cond.spnt page_fault
402 dep r21=-1,r21,IA64_PSR_ED_BIT,1
403 or r19=r19,r17 // insert PTE control bits into r19
405 or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
408 (p7) itc.d r19 // insert the TLB entry
414 /////////////////////////////////////////////////////////////////////////////////////////
415 // 0x1400 Entry 5 (size 64 bundles) Data nested TLB (6,45)
416 ENTRY(nested_dtlb_miss)
418 * In the absence of kernel bugs, we get here when the virtually mapped linear
419 * page table is accessed non-speculatively (e.g., in the Dirty-bit, Instruction
420 * Access-bit, or Data Access-bit faults). If the DTLB entry for the virtual page
421 * table is missing, a nested TLB miss fault is triggered and control is
422 * transferred to this point. When this happens, we lookup the pte for the
423 * faulting address by walking the page table in physical mode and return to the
424 * continuation point passed in register r30 (or call page_fault if the address is
427 * Input: r16: faulting address
429 * r30: continuation address
432 * Output: r17: physical address of PTE of faulting address
434 * r30: continuation address
437 * Clobbered: b0, r18, r19, r21, r22, psr.dt (cleared)
439 rsm psr.dt // switch to using physical data addressing
440 mov r19=IA64_KR(PT_BASE) // get the page table base address
441 shl r21=r16,3 // shift bit 60 into sign bit
444 shr.u r17=r16,61 // get the region number into r17
445 extr.u r18=r18,2,6 // get the faulting page size
447 cmp.eq p6,p7=5,r17 // is faulting address in region 5?
448 add r22=-PAGE_SHIFT,r18 // adjustment for hugetlb address
449 add r18=PGDIR_SHIFT-PAGE_SHIFT,r18
453 (p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
456 LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
458 .pred.rel "mutex", p6, p7
459 (p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
460 (p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
462 (p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=pgd_offset for region 5
463 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=pgd_offset for region[0-4]
464 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
465 #ifdef CONFIG_PGTABLE_4
466 shr.u r18=r22,PUD_SHIFT // shift pud index into position
468 shr.u r18=r22,PMD_SHIFT // shift pmd index into position
471 ld8 r17=[r17] // get *pgd (may be 0)
473 (p7) cmp.eq p6,p7=r17,r0 // was pgd_present(*pgd) == NULL?
474 dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=p[u|m]d_offset(pgd,addr)
476 #ifdef CONFIG_PGTABLE_4
477 (p7) ld8 r17=[r17] // get *pud (may be 0)
478 shr.u r18=r22,PMD_SHIFT // shift pmd index into position
480 (p7) cmp.eq.or.andcm p6,p7=r17,r0 // was pud_present(*pud) == NULL?
481 dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=pmd_offset(pud,addr)
484 (p7) ld8 r17=[r17] // get *pmd (may be 0)
485 shr.u r19=r22,PAGE_SHIFT // shift pte index into position
487 (p7) cmp.eq.or.andcm p6,p7=r17,r0 // was pmd_present(*pmd) == NULL?
488 dep r17=r19,r17,3,(PAGE_SHIFT-3) // r17=pte_offset(pmd,addr);
489 (p6) br.cond.spnt page_fault
491 br.sptk.many b0 // return to continuation point
492 END(nested_dtlb_miss)
495 /////////////////////////////////////////////////////////////////////////////////////////
496 // 0x1800 Entry 6 (size 64 bundles) Instruction Key Miss (24)
502 //-----------------------------------------------------------------------------------
503 // call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
510 alloc r15=ar.pfs,0,0,3,0
513 adds r3=8,r2 // set up second base pointer
515 ssm psr.ic | PSR_DEFAULT_BITS
517 srlz.i // guarantee that interruption collectin is on
519 (p15) ssm psr.i // restore psr.i
520 movl r14=ia64_leave_kernel
525 adds out2=16,r12 // out2 = pointer to pt_regs
526 br.call.sptk.many b6=ia64_do_page_fault // ignore return address
530 /////////////////////////////////////////////////////////////////////////////////////////
531 // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
538 /////////////////////////////////////////////////////////////////////////////////////////
539 // 0x2000 Entry 8 (size 64 bundles) Dirty-bit (54)
543 * What we do here is to simply turn on the dirty bit in the PTE. We need to
544 * update both the page-table and the TLB entry. To efficiently access the PTE,
545 * we address it through the virtual page table. Most likely, the TLB entry for
546 * the relevant virtual page table page is still present in the TLB so we can
547 * normally do this without additional TLB misses. In case the necessary virtual
548 * page table TLB entry isn't present, we take a nested TLB miss hit where we look
549 * up the physical address of the L3 PTE and then continue at label 1 below.
551 mov r16=cr.ifa // get the address that caused the fault
552 movl r30=1f // load continuation point in case of nested fault
554 thash r17=r16 // compute virtual address of L3 PTE
555 mov r29=b0 // save b0 in case of nested fault
556 mov r31=pr // save pr
558 mov r28=ar.ccv // save ar.ccv
561 ;; // avoid RAW on r18
562 mov ar.ccv=r18 // set compare value for cmpxchg
563 or r25=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
564 tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
566 (p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only update if page is present
567 mov r24=PAGE_SHIFT<<2
569 (p6) cmp.eq p6,p7=r26,r18 // Only compare if page is present
571 (p6) itc.d r25 // install updated PTE
574 * Tell the assemblers dependency-violation checker that the above "itc" instructions
575 * cannot possibly affect the following loads:
579 ld8 r18=[r17] // read PTE again
581 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
584 mov b0=r29 // restore b0
589 ;; // avoid RAW on r18
590 or r18=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
591 mov b0=r29 // restore b0
593 st8 [r17]=r18 // store back updated PTE
594 itc.d r18 // install updated PTE
596 mov pr=r31,-1 // restore pr
601 /////////////////////////////////////////////////////////////////////////////////////////
602 // 0x2400 Entry 9 (size 64 bundles) Instruction Access-bit (27)
605 // Like Entry 8, except for instruction access
606 mov r16=cr.ifa // get the address that caused the fault
607 movl r30=1f // load continuation point in case of nested fault
608 mov r31=pr // save predicates
609 #ifdef CONFIG_ITANIUM
611 * Erratum 10 (IFA may contain incorrect address) has "NoFix" status.
616 tbit.z p6,p0=r17,IA64_PSR_IS_BIT // IA64 instruction set?
618 (p6) mov r16=r18 // if so, use cr.iip instead of cr.ifa
619 #endif /* CONFIG_ITANIUM */
621 thash r17=r16 // compute virtual address of L3 PTE
622 mov r29=b0 // save b0 in case of nested fault)
624 mov r28=ar.ccv // save ar.ccv
628 mov ar.ccv=r18 // set compare value for cmpxchg
629 or r25=_PAGE_A,r18 // set the accessed bit
630 tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
632 (p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only if page present
633 mov r24=PAGE_SHIFT<<2
635 (p6) cmp.eq p6,p7=r26,r18 // Only if page present
637 (p6) itc.i r25 // install updated PTE
640 * Tell the assemblers dependency-violation checker that the above "itc" instructions
641 * cannot possibly affect the following loads:
645 ld8 r18=[r17] // read PTE again
647 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
650 mov b0=r29 // restore b0
652 #else /* !CONFIG_SMP */
656 or r18=_PAGE_A,r18 // set the accessed bit
657 mov b0=r29 // restore b0
659 st8 [r17]=r18 // store back updated PTE
660 itc.i r18 // install updated PTE
661 #endif /* !CONFIG_SMP */
667 /////////////////////////////////////////////////////////////////////////////////////////
668 // 0x2800 Entry 10 (size 64 bundles) Data Access-bit (15,55)
671 // Like Entry 8, except for data access
672 mov r16=cr.ifa // get the address that caused the fault
673 movl r30=1f // load continuation point in case of nested fault
675 thash r17=r16 // compute virtual address of L3 PTE
677 mov r29=b0 // save b0 in case of nested fault)
679 mov r28=ar.ccv // save ar.ccv
682 ;; // avoid RAW on r18
683 mov ar.ccv=r18 // set compare value for cmpxchg
684 or r25=_PAGE_A,r18 // set the dirty bit
685 tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
687 (p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only if page is present
688 mov r24=PAGE_SHIFT<<2
690 (p6) cmp.eq p6,p7=r26,r18 // Only if page is present
692 (p6) itc.d r25 // install updated PTE
694 * Tell the assemblers dependency-violation checker that the above "itc" instructions
695 * cannot possibly affect the following loads:
699 ld8 r18=[r17] // read PTE again
701 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
708 ;; // avoid RAW on r18
709 or r18=_PAGE_A,r18 // set the accessed bit
711 st8 [r17]=r18 // store back updated PTE
712 itc.d r18 // install updated PTE
714 mov b0=r29 // restore b0
720 /////////////////////////////////////////////////////////////////////////////////////////
721 // 0x2c00 Entry 11 (size 64 bundles) Break instruction (33)
724 * The streamlined system call entry/exit paths only save/restore the initial part
725 * of pt_regs. This implies that the callers of system-calls must adhere to the
726 * normal procedure calling conventions.
728 * Registers to be saved & restored:
729 * CR registers: cr.ipsr, cr.iip, cr.ifs
730 * AR registers: ar.unat, ar.pfs, ar.rsc, ar.rnat, ar.bspstore, ar.fpsr
731 * others: pr, b0, b6, loadrs, r1, r11, r12, r13, r15
732 * Registers to be restored only:
733 * r8-r11: output value from the system call.
735 * During system call exit, scratch registers (including r15) are modified/cleared
736 * to prevent leaking bits from kernel to user level.
739 mov.m r16=IA64_KR(CURRENT) // M2 r16 <- current task (12 cyc)
740 mov r29=cr.ipsr // M2 (12 cyc)
741 mov r31=pr // I0 (2 cyc)
743 mov r17=cr.iim // M2 (2 cyc)
744 mov.m r27=ar.rsc // M2 (12 cyc)
745 mov r18=__IA64_BREAK_SYSCALL // A
748 mov.m r21=ar.fpsr // M2 (12 cyc)
749 mov r19=b6 // I0 (2 cyc)
751 mov.m r23=ar.bspstore // M2 (12 cyc)
752 mov.m r24=ar.rnat // M2 (5 cyc)
753 mov.i r26=ar.pfs // I0 (2 cyc)
757 mov r20=r1 // A save r1
760 movl r30=sys_call_table // X
762 mov r28=cr.iip // M2 (2 cyc)
763 cmp.eq p0,p7=r18,r17 // I0 is this a system call?
764 (p7) br.cond.spnt non_syscall // B no ->
766 // From this point on, we are definitely on the syscall-path
767 // and we can use (non-banked) scratch registers.
769 ///////////////////////////////////////////////////////////////////////
770 mov r1=r16 // A move task-pointer to "addl"-addressable reg
771 mov r2=r16 // A setup r2 for ia64_syscall_setup
772 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 // A r9 = ¤t_thread_info()->flags
774 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
775 adds r15=-1024,r15 // A subtract 1024 from syscall number
776 mov r3=NR_syscalls - 1
778 ld1.bias r17=[r16] // M0|1 r17 = current->thread.on_ustack flag
779 ld4 r9=[r9] // M0|1 r9 = current_thread_info()->flags
780 extr.u r8=r29,41,2 // I0 extract ei field from cr.ipsr
782 shladd r30=r15,3,r30 // A r30 = sys_call_table + 8*(syscall-1024)
783 addl r22=IA64_RBS_OFFSET,r1 // A compute base of RBS
784 cmp.leu p6,p7=r15,r3 // A syscall number in range?
787 lfetch.fault.excl.nt1 [r22] // M0|1 prefetch RBS
788 (p6) ld8 r30=[r30] // M0|1 load address of syscall entry point
789 tnat.nz.or p7,p0=r15 // I0 is syscall nr a NaT?
791 mov.m ar.bspstore=r22 // M2 switch to kernel RBS
792 cmp.eq p8,p9=2,r8 // A isr.ei==2?
795 (p8) mov r8=0 // A clear ei to 0
796 (p7) movl r30=sys_ni_syscall // X
798 (p8) adds r28=16,r28 // A switch cr.iip to next bundle
799 (p9) adds r8=1,r8 // A increment ei to next slot
803 mov.m r25=ar.unat // M2 (5 cyc)
804 dep r29=r8,r29,41,2 // I0 insert new ei into cr.ipsr
805 adds r15=1024,r15 // A restore original syscall number
807 // If any of the above loads miss in L1D, we'll stall here until
810 ///////////////////////////////////////////////////////////////////////
811 st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag
812 mov b6=r30 // I0 setup syscall handler branch reg early
813 cmp.eq pKStk,pUStk=r0,r17 // A were we on kernel stacks already?
815 and r9=_TIF_SYSCALL_TRACEAUDIT,r9 // A mask trace or audit
816 mov r18=ar.bsp // M2 (12 cyc)
817 (pKStk) br.cond.spnt .break_fixup // B we're already in kernel-mode -- fix up RBS
819 .back_from_break_fixup:
820 (pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1 // A compute base of memory stack
821 cmp.eq p14,p0=r9,r0 // A are syscalls being traced/audited?
822 br.call.sptk.many b7=ia64_syscall_setup // B
824 mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0
826 bsw.1 // B (6 cyc) regs are saved, switch to bank 1
829 ssm psr.ic | PSR_DEFAULT_BITS // M2 now it's safe to re-enable intr.-collection
830 movl r3=ia64_ret_from_syscall // X
833 srlz.i // M0 ensure interruption collection is on
834 mov rp=r3 // I0 set the real return addr
835 (p10) br.cond.spnt.many ia64_ret_from_syscall // B return if bad call-frame or r15 is a NaT
837 (p15) ssm psr.i // M2 restore psr.i
838 (p14) br.call.sptk.many b6=b6 // B invoke syscall-handker (ignore return addr)
839 br.cond.spnt.many ia64_trace_syscall // B do syscall-tracing thingamagic
841 ///////////////////////////////////////////////////////////////////////
842 // On entry, we optimistically assumed that we're coming from user-space.
843 // For the rare cases where a system-call is done from within the kernel,
844 // we fix things up at this point:
846 add r1=-IA64_PT_REGS_SIZE,sp // A allocate space for pt_regs structure
847 mov ar.rnat=r24 // M2 restore kernel's AR.RNAT
849 mov ar.bspstore=r23 // M2 restore kernel's AR.BSPSTORE
850 br.cond.sptk .back_from_break_fixup
854 /////////////////////////////////////////////////////////////////////////////////////////
855 // 0x3000 Entry 12 (size 64 bundles) External Interrupt (4)
858 mov r31=pr // prepare to save predicates
860 SAVE_MIN_WITH_COVER // uses r31; defines r2 and r3
861 ssm psr.ic | PSR_DEFAULT_BITS
863 adds r3=8,r2 // set up second base pointer for SAVE_REST
864 srlz.i // ensure everybody knows psr.ic is back on
868 MCA_RECOVER_RANGE(interrupt)
869 alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
870 mov out0=cr.ivr // pass cr.ivr as first arg
871 add out1=16,sp // pass pointer to pt_regs as second arg
873 srlz.d // make sure we see the effect of cr.ivr
874 movl r14=ia64_leave_kernel
877 br.call.sptk.many b6=ia64_handle_irq
881 /////////////////////////////////////////////////////////////////////////////////////////
882 // 0x3400 Entry 13 (size 64 bundles) Reserved
887 /////////////////////////////////////////////////////////////////////////////////////////
888 // 0x3800 Entry 14 (size 64 bundles) Reserved
893 * There is no particular reason for this code to be here, other than that
894 * there happens to be space here that would go unused otherwise. If this
895 * fault ever gets "unreserved", simply moved the following code to a more
898 * ia64_syscall_setup() is a separate subroutine so that it can
899 * allocate stacked registers so it can safely demine any
900 * potential NaT values from the input registers.
903 * - executing on bank 0 or bank 1 register set (doesn't matter)
904 * - r1: stack pointer
905 * - r2: current task pointer
907 * - r11: original contents (saved ar.pfs to be saved)
908 * - r12: original contents (sp to be saved)
909 * - r13: original contents (tp to be saved)
910 * - r15: original contents (syscall # to be saved)
911 * - r18: saved bsp (after switching to kernel stack)
913 * - r20: saved r1 (gp)
914 * - r21: saved ar.fpsr
915 * - r22: kernel's register backing store base (krbs_base)
916 * - r23: saved ar.bspstore
917 * - r24: saved ar.rnat
918 * - r25: saved ar.unat
919 * - r26: saved ar.pfs
920 * - r27: saved ar.rsc
921 * - r28: saved cr.iip
922 * - r29: saved cr.ipsr
924 * - b0: original contents (to be saved)
926 * - p10: TRUE if syscall is invoked with more than 8 out
927 * registers or r15's Nat is true
929 * - r3: preserved (same as on entry)
930 * - r8: -EINVAL if p10 is true
931 * - r12: points to kernel stack
932 * - r13: points to current task
933 * - r14: preserved (same as on entry)
935 * - p15: TRUE if interrupts need to be re-enabled
936 * - ar.fpsr: set to kernel settings
937 * - b6: preserved (same as on entry)
939 GLOBAL_ENTRY(ia64_syscall_setup)
941 # error This code assumes that b6 is the first field in pt_regs.
943 st8 [r1]=r19 // save b6
944 add r16=PT(CR_IPSR),r1 // initialize first base pointer
945 add r17=PT(R11),r1 // initialize second base pointer
947 alloc r19=ar.pfs,8,0,0,0 // ensure in0-in7 are writable
948 st8 [r16]=r29,PT(AR_PFS)-PT(CR_IPSR) // save cr.ipsr
951 st8.spill [r17]=r11,PT(CR_IIP)-PT(R11) // save r11
953 (pKStk) mov r18=r0 // make sure r18 isn't NaT
956 st8 [r16]=r26,PT(CR_IFS)-PT(AR_PFS) // save ar.pfs
957 st8 [r17]=r28,PT(AR_UNAT)-PT(CR_IIP) // save cr.iip
958 mov r28=b0 // save b0 (2 cyc)
961 st8 [r17]=r25,PT(AR_RSC)-PT(AR_UNAT) // save ar.unat
962 dep r19=0,r19,38,26 // clear all bits but 0..37 [I0]
966 st8 [r16]=r19,PT(AR_RNAT)-PT(CR_IFS) // store ar.pfs.pfm in cr.ifs
967 extr.u r11=r19,7,7 // I0 // get sol of ar.pfs
968 and r8=0x7f,r19 // A // get sof of ar.pfs
970 st8 [r17]=r27,PT(AR_BSPSTORE)-PT(AR_RSC)// save ar.rsc
971 tbit.nz p15,p0=r29,IA64_PSR_I_BIT // I0
975 (pUStk) sub r18=r18,r22 // r18=RSE.ndirty*8
979 (pKStk) adds r16=PT(PR)-PT(AR_RNAT),r16 // skip over ar_rnat field
980 (pKStk) adds r17=PT(B0)-PT(AR_BSPSTORE),r17 // skip over ar_bspstore field
984 tnat.nz p12,p0=in4 // [I0]
987 (pUStk) st8 [r16]=r24,PT(PR)-PT(AR_RNAT) // save ar.rnat
988 (pUStk) st8 [r17]=r23,PT(B0)-PT(AR_BSPSTORE) // save ar.bspstore
989 shl r18=r18,16 // compute ar.rsc to be used for "loadrs"
991 st8 [r16]=r31,PT(LOADRS)-PT(PR) // save predicates
992 st8 [r17]=r28,PT(R1)-PT(B0) // save b0
993 tnat.nz p13,p0=in5 // [I0]
995 st8 [r16]=r18,PT(R12)-PT(LOADRS) // save ar.rsc value for "loadrs"
996 st8.spill [r17]=r20,PT(R13)-PT(R1) // save original r1
1000 .mem.offset 0,0; st8.spill [r16]=r12,PT(AR_FPSR)-PT(R12) // save r12
1001 .mem.offset 8,0; st8.spill [r17]=r13,PT(R15)-PT(R13) // save r13
1004 st8 [r16]=r21,PT(R8)-PT(AR_FPSR) // save ar.fpsr
1006 cmp.lt p10,p9=r11,r8 // frame size can't be more than local+8
1009 (p9) tnat.nz p10,p0=r15
1010 adds r12=-16,r1 // switch to kernel memory stack (with 16 bytes of scratch)
1012 st8.spill [r17]=r15 // save r15
1016 mov r13=r2 // establish `current'
1017 movl r1=__gp // establish kernel global pointer
1019 st8 [r16]=r8 // ensure pt_regs.r8 != 0 (see handle_syscall_error)
1023 cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
1024 movl r17=FPSR_DEFAULT
1026 mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
1027 (p10) mov r8=-EINVAL
1029 END(ia64_syscall_setup)
1031 .org ia64_ivt+0x3c00
1032 /////////////////////////////////////////////////////////////////////////////////////////
1033 // 0x3c00 Entry 15 (size 64 bundles) Reserved
1038 * Squatting in this space ...
1040 * This special case dispatcher for illegal operation faults allows preserved
1041 * registers to be modified through a callback function (asm only) that is handed
1042 * back from the fault handler in r8. Up to three arguments can be passed to the
1043 * callback function by returning an aggregate with the callback as its first
1044 * element, followed by the arguments.
1046 ENTRY(dispatch_illegal_op_fault)
1050 ssm psr.ic | PSR_DEFAULT_BITS
1052 srlz.i // guarantee that interruption collection is on
1054 (p15) ssm psr.i // restore psr.i
1055 adds r3=8,r2 // set up second base pointer for SAVE_REST
1057 alloc r14=ar.pfs,0,0,1,0 // must be first in insn group
1061 PT_REGS_UNWIND_INFO(0)
1063 br.call.sptk.many rp=ia64_illegal_op_fault
1065 alloc r14=ar.pfs,0,0,3,0 // must be first in insn group
1069 movl r15=ia64_leave_kernel
1075 (p6) br.call.dpnt.many b6=b6 // call returns to ia64_leave_kernel
1076 br.sptk.many ia64_leave_kernel
1077 END(dispatch_illegal_op_fault)
1079 .org ia64_ivt+0x4000
1080 /////////////////////////////////////////////////////////////////////////////////////////
1081 // 0x4000 Entry 16 (size 64 bundles) Reserved
1085 .org ia64_ivt+0x4400
1086 /////////////////////////////////////////////////////////////////////////////////////////
1087 // 0x4400 Entry 17 (size 64 bundles) Reserved
1092 mov ar.rsc=r27 // restore ar.rsc before SAVE_MIN_WITH_COVER
1096 // There is no particular reason for this code to be here, other than that
1097 // there happens to be space here that would go unused otherwise. If this
1098 // fault ever gets "unreserved", simply moved the following code to a more
1101 alloc r14=ar.pfs,0,0,2,0
1104 adds r3=8,r2 // set up second base pointer for SAVE_REST
1106 ssm psr.ic | PSR_DEFAULT_BITS
1108 srlz.i // guarantee that interruption collection is on
1110 (p15) ssm psr.i // restore psr.i
1111 movl r15=ia64_leave_kernel
1116 br.call.sptk.many b6=ia64_bad_break // avoid WAW on CFM and ignore return addr
1119 .org ia64_ivt+0x4800
1120 /////////////////////////////////////////////////////////////////////////////////////////
1121 // 0x4800 Entry 18 (size 64 bundles) Reserved
1126 * There is no particular reason for this code to be here, other than that
1127 * there happens to be space here that would go unused otherwise. If this
1128 * fault ever gets "unreserved", simply moved the following code to a more
1132 ENTRY(dispatch_unaligned_handler)
1135 alloc r14=ar.pfs,0,0,2,0 // now it's safe (must be first in insn group!)
1139 ssm psr.ic | PSR_DEFAULT_BITS
1141 srlz.i // guarantee that interruption collection is on
1143 (p15) ssm psr.i // restore psr.i
1144 adds r3=8,r2 // set up second base pointer
1147 movl r14=ia64_leave_kernel
1150 br.sptk.many ia64_prepare_handle_unaligned
1151 END(dispatch_unaligned_handler)
1153 .org ia64_ivt+0x4c00
1154 /////////////////////////////////////////////////////////////////////////////////////////
1155 // 0x4c00 Entry 19 (size 64 bundles) Reserved
1160 * There is no particular reason for this code to be here, other than that
1161 * there happens to be space here that would go unused otherwise. If this
1162 * fault ever gets "unreserved", simply moved the following code to a more
1166 ENTRY(dispatch_to_fault_handler)
1170 * r19: fault vector number (e.g., 24 for General Exception)
1171 * r31: contains saved predicates (pr)
1173 SAVE_MIN_WITH_COVER_R19
1174 alloc r14=ar.pfs,0,0,5,0
1181 ssm psr.ic | PSR_DEFAULT_BITS
1183 srlz.i // guarantee that interruption collection is on
1185 (p15) ssm psr.i // restore psr.i
1186 adds r3=8,r2 // set up second base pointer for SAVE_REST
1189 movl r14=ia64_leave_kernel
1192 br.call.sptk.many b6=ia64_fault
1193 END(dispatch_to_fault_handler)
1196 // --- End of long entries, Beginning of short entries
1199 .org ia64_ivt+0x5000
1200 /////////////////////////////////////////////////////////////////////////////////////////
1201 // 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
1202 ENTRY(page_not_present)
1207 * The Linux page fault handler doesn't expect non-present pages to be in
1208 * the TLB. Flush the existing entry now, so we meet that expectation.
1210 mov r17=PAGE_SHIFT<<2
1216 br.sptk.many page_fault
1217 END(page_not_present)
1219 .org ia64_ivt+0x5100
1220 /////////////////////////////////////////////////////////////////////////////////////////
1221 // 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
1222 ENTRY(key_permission)
1229 br.sptk.many page_fault
1232 .org ia64_ivt+0x5200
1233 /////////////////////////////////////////////////////////////////////////////////////////
1234 // 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
1235 ENTRY(iaccess_rights)
1242 br.sptk.many page_fault
1245 .org ia64_ivt+0x5300
1246 /////////////////////////////////////////////////////////////////////////////////////////
1247 // 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
1248 ENTRY(daccess_rights)
1255 br.sptk.many page_fault
1258 .org ia64_ivt+0x5400
1259 /////////////////////////////////////////////////////////////////////////////////////////
1260 // 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
1261 ENTRY(general_exception)
1267 (p6) br.sptk.many dispatch_illegal_op_fault
1269 mov r19=24 // fault number
1270 br.sptk.many dispatch_to_fault_handler
1271 END(general_exception)
1273 .org ia64_ivt+0x5500
1274 /////////////////////////////////////////////////////////////////////////////////////////
1275 // 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35)
1276 ENTRY(disabled_fp_reg)
1278 rsm psr.dfh // ensure we can access fph
1283 br.sptk.many dispatch_to_fault_handler
1284 END(disabled_fp_reg)
1286 .org ia64_ivt+0x5600
1287 /////////////////////////////////////////////////////////////////////////////////////////
1288 // 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50)
1289 ENTRY(nat_consumption)
1294 mov r31=pr // save PR
1296 and r18=0xf,r17 // r18 = cr.ipsr.code{3:0}
1297 tbit.z p6,p0=r17,IA64_ISR_NA_BIT
1299 cmp.ne.or p6,p0=IA64_ISR_CODE_LFETCH,r18
1300 dep r16=-1,r16,IA64_PSR_ED_BIT,1
1301 (p6) br.cond.spnt 1f // branch if (cr.ispr.na == 0 || cr.ipsr.code{3:0} != LFETCH)
1303 mov cr.ipsr=r16 // set cr.ipsr.na
1311 END(nat_consumption)
1313 .org ia64_ivt+0x5700
1314 /////////////////////////////////////////////////////////////////////////////////////////
1315 // 0x5700 Entry 27 (size 16 bundles) Speculation (40)
1316 ENTRY(speculation_vector)
1319 * A [f]chk.[as] instruction needs to take the branch to the recovery code but
1320 * this part of the architecture is not implemented in hardware on some CPUs, such
1321 * as Itanium. Thus, in general we need to emulate the behavior. IIM contains
1322 * the relative target (not yet sign extended). So after sign extending it we
1323 * simply add it to IIP. We also need to reset the EI field of the IPSR to zero,
1324 * i.e., the slot to restart into.
1326 * cr.imm contains zero_ext(imm21)
1331 shl r18=r18,43 // put sign bit in position (43=64-21)
1335 shr r18=r18,39 // sign extend (39=43-4)
1338 add r17=r17,r18 // now add the offset
1341 dep r16=0,r16,41,2 // clear EI
1348 END(speculation_vector)
1350 .org ia64_ivt+0x5800
1351 /////////////////////////////////////////////////////////////////////////////////////////
1352 // 0x5800 Entry 28 (size 16 bundles) Reserved
1356 .org ia64_ivt+0x5900
1357 /////////////////////////////////////////////////////////////////////////////////////////
1358 // 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
1364 .org ia64_ivt+0x5a00
1365 /////////////////////////////////////////////////////////////////////////////////////////
1366 // 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57)
1367 ENTRY(unaligned_access)
1369 mov r31=pr // prepare to save predicates
1371 br.sptk.many dispatch_unaligned_handler
1372 END(unaligned_access)
1374 .org ia64_ivt+0x5b00
1375 /////////////////////////////////////////////////////////////////////////////////////////
1376 // 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57)
1377 ENTRY(unsupported_data_reference)
1380 END(unsupported_data_reference)
1382 .org ia64_ivt+0x5c00
1383 /////////////////////////////////////////////////////////////////////////////////////////
1384 // 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64)
1385 ENTRY(floating_point_fault)
1388 END(floating_point_fault)
1390 .org ia64_ivt+0x5d00
1391 /////////////////////////////////////////////////////////////////////////////////////////
1392 // 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66)
1393 ENTRY(floating_point_trap)
1396 END(floating_point_trap)
1398 .org ia64_ivt+0x5e00
1399 /////////////////////////////////////////////////////////////////////////////////////////
1400 // 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Transfer Trap (66)
1401 ENTRY(lower_privilege_trap)
1404 END(lower_privilege_trap)
1406 .org ia64_ivt+0x5f00
1407 /////////////////////////////////////////////////////////////////////////////////////////
1408 // 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68)
1409 ENTRY(taken_branch_trap)
1412 END(taken_branch_trap)
1414 .org ia64_ivt+0x6000
1415 /////////////////////////////////////////////////////////////////////////////////////////
1416 // 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69)
1417 ENTRY(single_step_trap)
1420 END(single_step_trap)
1422 .org ia64_ivt+0x6100
1423 /////////////////////////////////////////////////////////////////////////////////////////
1424 // 0x6100 Entry 37 (size 16 bundles) Reserved
1428 .org ia64_ivt+0x6200
1429 /////////////////////////////////////////////////////////////////////////////////////////
1430 // 0x6200 Entry 38 (size 16 bundles) Reserved
1434 .org ia64_ivt+0x6300
1435 /////////////////////////////////////////////////////////////////////////////////////////
1436 // 0x6300 Entry 39 (size 16 bundles) Reserved
1440 .org ia64_ivt+0x6400
1441 /////////////////////////////////////////////////////////////////////////////////////////
1442 // 0x6400 Entry 40 (size 16 bundles) Reserved
1446 .org ia64_ivt+0x6500
1447 /////////////////////////////////////////////////////////////////////////////////////////
1448 // 0x6500 Entry 41 (size 16 bundles) Reserved
1452 .org ia64_ivt+0x6600
1453 /////////////////////////////////////////////////////////////////////////////////////////
1454 // 0x6600 Entry 42 (size 16 bundles) Reserved
1458 .org ia64_ivt+0x6700
1459 /////////////////////////////////////////////////////////////////////////////////////////
1460 // 0x6700 Entry 43 (size 16 bundles) Reserved
1464 .org ia64_ivt+0x6800
1465 /////////////////////////////////////////////////////////////////////////////////////////
1466 // 0x6800 Entry 44 (size 16 bundles) Reserved
1470 .org ia64_ivt+0x6900
1471 /////////////////////////////////////////////////////////////////////////////////////////
1472 // 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)
1473 ENTRY(ia32_exception)
1478 .org ia64_ivt+0x6a00
1479 /////////////////////////////////////////////////////////////////////////////////////////
1480 // 0x6a00 Entry 46 (size 16 bundles) IA-32 Intercept (30,31,59,70,71)
1481 ENTRY(ia32_intercept)
1483 #ifdef CONFIG_IA32_SUPPORT
1487 extr.u r17=r16,16,8 // get ISR.code
1489 mov r19=cr.iim // old eflag value
1492 (p6) br.cond.spnt 1f // not a system flag fault
1495 extr.u r17=r16,18,1 // get the eflags.ac bit
1498 (p6) br.cond.spnt 1f // eflags.ac bit didn't change
1500 mov pr=r31,-1 // restore predicate registers
1504 #endif // CONFIG_IA32_SUPPORT
1508 .org ia64_ivt+0x6b00
1509 /////////////////////////////////////////////////////////////////////////////////////////
1510 // 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt (74)
1511 ENTRY(ia32_interrupt)
1513 #ifdef CONFIG_IA32_SUPPORT
1515 br.sptk.many dispatch_to_ia32_handler
1521 .org ia64_ivt+0x6c00
1522 /////////////////////////////////////////////////////////////////////////////////////////
1523 // 0x6c00 Entry 48 (size 16 bundles) Reserved
1527 .org ia64_ivt+0x6d00
1528 /////////////////////////////////////////////////////////////////////////////////////////
1529 // 0x6d00 Entry 49 (size 16 bundles) Reserved
1533 .org ia64_ivt+0x6e00
1534 /////////////////////////////////////////////////////////////////////////////////////////
1535 // 0x6e00 Entry 50 (size 16 bundles) Reserved
1539 .org ia64_ivt+0x6f00
1540 /////////////////////////////////////////////////////////////////////////////////////////
1541 // 0x6f00 Entry 51 (size 16 bundles) Reserved
1545 .org ia64_ivt+0x7000
1546 /////////////////////////////////////////////////////////////////////////////////////////
1547 // 0x7000 Entry 52 (size 16 bundles) Reserved
1551 .org ia64_ivt+0x7100
1552 /////////////////////////////////////////////////////////////////////////////////////////
1553 // 0x7100 Entry 53 (size 16 bundles) Reserved
1557 .org ia64_ivt+0x7200
1558 /////////////////////////////////////////////////////////////////////////////////////////
1559 // 0x7200 Entry 54 (size 16 bundles) Reserved
1563 .org ia64_ivt+0x7300
1564 /////////////////////////////////////////////////////////////////////////////////////////
1565 // 0x7300 Entry 55 (size 16 bundles) Reserved
1569 .org ia64_ivt+0x7400
1570 /////////////////////////////////////////////////////////////////////////////////////////
1571 // 0x7400 Entry 56 (size 16 bundles) Reserved
1575 .org ia64_ivt+0x7500
1576 /////////////////////////////////////////////////////////////////////////////////////////
1577 // 0x7500 Entry 57 (size 16 bundles) Reserved
1581 .org ia64_ivt+0x7600
1582 /////////////////////////////////////////////////////////////////////////////////////////
1583 // 0x7600 Entry 58 (size 16 bundles) Reserved
1587 .org ia64_ivt+0x7700
1588 /////////////////////////////////////////////////////////////////////////////////////////
1589 // 0x7700 Entry 59 (size 16 bundles) Reserved
1593 .org ia64_ivt+0x7800
1594 /////////////////////////////////////////////////////////////////////////////////////////
1595 // 0x7800 Entry 60 (size 16 bundles) Reserved
1599 .org ia64_ivt+0x7900
1600 /////////////////////////////////////////////////////////////////////////////////////////
1601 // 0x7900 Entry 61 (size 16 bundles) Reserved
1605 .org ia64_ivt+0x7a00
1606 /////////////////////////////////////////////////////////////////////////////////////////
1607 // 0x7a00 Entry 62 (size 16 bundles) Reserved
1611 .org ia64_ivt+0x7b00
1612 /////////////////////////////////////////////////////////////////////////////////////////
1613 // 0x7b00 Entry 63 (size 16 bundles) Reserved
1617 .org ia64_ivt+0x7c00
1618 /////////////////////////////////////////////////////////////////////////////////////////
1619 // 0x7c00 Entry 64 (size 16 bundles) Reserved
1623 .org ia64_ivt+0x7d00
1624 /////////////////////////////////////////////////////////////////////////////////////////
1625 // 0x7d00 Entry 65 (size 16 bundles) Reserved
1629 .org ia64_ivt+0x7e00
1630 /////////////////////////////////////////////////////////////////////////////////////////
1631 // 0x7e00 Entry 66 (size 16 bundles) Reserved
1635 .org ia64_ivt+0x7f00
1636 /////////////////////////////////////////////////////////////////////////////////////////
1637 // 0x7f00 Entry 67 (size 16 bundles) Reserved
1641 #ifdef CONFIG_IA32_SUPPORT
1644 * There is no particular reason for this code to be here, other than that
1645 * there happens to be space here that would go unused otherwise. If this
1646 * fault ever gets "unreserved", simply moved the following code to a more
1650 // IA32 interrupt entry point
1652 ENTRY(dispatch_to_ia32_handler)
1656 ssm psr.ic | PSR_DEFAULT_BITS
1658 srlz.i // guarantee that interruption collection is on
1661 adds r3=8,r2 // Base pointer for SAVE_REST
1666 shr r14=r14,16 // Get interrupt number
1668 cmp.ne p6,p0=r14,r15
1669 (p6) br.call.dpnt.many b6=non_ia32_syscall
1671 adds r14=IA64_PT_REGS_R8_OFFSET + 16,sp // 16 byte hole per SW conventions
1672 adds r15=IA64_PT_REGS_R1_OFFSET + 16,sp
1674 cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
1675 ld8 r8=[r14] // get r8
1677 st8 [r15]=r8 // save original EAX in r1 (IA32 procs don't use the GP)
1679 alloc r15=ar.pfs,0,0,6,0 // must first in an insn group
1681 ld4 r8=[r14],8 // r8 == eax (syscall number)
1682 mov r15=IA32_NR_syscalls
1684 cmp.ltu.unc p6,p7=r8,r15
1685 ld4 out1=[r14],8 // r9 == ecx
1687 ld4 out2=[r14],8 // r10 == edx
1689 ld4 out0=[r14] // r11 == ebx
1690 adds r14=(IA64_PT_REGS_R13_OFFSET) + 16,sp
1692 ld4 out5=[r14],PT(R14)-PT(R13) // r13 == ebp
1694 ld4 out3=[r14],PT(R15)-PT(R14) // r14 == esi
1695 adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
1697 ld4 out4=[r14] // r15 == edi
1698 movl r16=ia32_syscall_table
1700 (p6) shladd r16=r8,3,r16 // force ni_syscall if not valid syscall number
1701 ld4 r2=[r2] // r2 = current_thread_info()->flags
1704 and r2=_TIF_SYSCALL_TRACEAUDIT,r2 // mask trace or audit
1707 movl r15=ia32_ret_from_syscall
1711 (p8) br.call.sptk.many b6=b6
1712 br.cond.sptk ia32_trace_syscall
1715 alloc r15=ar.pfs,0,0,2,0
1716 mov out0=r14 // interrupt #
1717 add out1=16,sp // pointer to pt_regs
1718 ;; // avoid WAW on CFM
1719 br.call.sptk.many rp=ia32_bad_interrupt
1720 .ret1: movl r15=ia64_leave_kernel
1724 END(dispatch_to_ia32_handler)
1726 #endif /* CONFIG_IA32_SUPPORT */