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, followed
95 * by inserting the TLB entry for the virtual page table page that the VHPT
96 * walker was attempting to access. The latter gets inserted as long
97 * as both L1 and L2 have valid mappings for the faulting address.
98 * The TLB entry for the original miss gets inserted only if
99 * the L3 entry indicates that the page is present.
101 * do_page_fault gets invoked in the following cases:
102 * - the faulting virtual address uses unimplemented address bits
103 * - the faulting virtual address has no L1, L2, or L3 mapping
105 mov r16=cr.ifa // get address that caused the TLB miss
106 #ifdef CONFIG_HUGETLB_PAGE
111 rsm psr.dt // use physical addressing for data
112 mov r31=pr // save the predicate registers
113 mov r19=IA64_KR(PT_BASE) // get page table base address
114 shl r21=r16,3 // shift bit 60 into sign bit
115 shr.u r17=r16,61 // get the region number into r17
118 #ifdef CONFIG_HUGETLB_PAGE
124 (p8) dep r25=r18,r25,2,6
128 cmp.eq p6,p7=5,r17 // is IFA pointing into to region 5?
129 shr.u r18=r22,PGDIR_SHIFT // get bits 33-63 of the faulting address
131 (p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
134 LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
136 .pred.rel "mutex", p6, p7
137 (p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
138 (p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
140 (p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=PTA + IFA(33,42)*8
141 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8)
142 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
143 shr.u r18=r22,PMD_SHIFT // shift L2 index into position
145 ld8 r17=[r17] // fetch the L1 entry (may be 0)
147 (p7) cmp.eq p6,p7=r17,r0 // was L1 entry NULL?
148 dep r17=r18,r17,3,(PAGE_SHIFT-3) // compute address of L2 page table entry
150 (p7) ld8 r20=[r17] // fetch the L2 entry (may be 0)
151 shr.u r19=r22,PAGE_SHIFT // shift L3 index into position
153 (p7) cmp.eq.or.andcm p6,p7=r20,r0 // was L2 entry NULL?
154 dep r21=r19,r20,3,(PAGE_SHIFT-3) // compute address of L3 page table entry
156 (p7) ld8 r18=[r21] // read the L3 PTE
157 mov r19=cr.isr // cr.isr bit 0 tells us if this is an insn miss
159 (p7) tbit.z p6,p7=r18,_PAGE_P_BIT // page present bit cleared?
160 mov r22=cr.iha // get the VHPT address that caused the TLB miss
161 ;; // avoid RAW on p7
162 (p7) tbit.nz.unc p10,p11=r19,32 // is it an instruction TLB miss?
163 dep r23=0,r20,0,PAGE_SHIFT // clear low bits to get page address
165 (p10) itc.i r18 // insert the instruction TLB entry
166 (p11) itc.d r18 // insert the data TLB entry
167 (p6) br.cond.spnt.many page_fault // handle bad address/page not present (page fault)
170 #ifdef CONFIG_HUGETLB_PAGE
171 (p8) mov cr.itir=r25 // change to default page-size for VHPT
175 * Now compute and insert the TLB entry for the virtual page table. We never
176 * execute in a page table page so there is no need to set the exception deferral
179 adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
185 * Tell the assemblers dependency-violation checker that the above "itc" instructions
186 * cannot possibly affect the following loads:
191 * Re-check L2 and L3 pagetable. If they changed, we may have received a ptc.g
192 * between reading the pagetable and the "itc". If so, flush the entry we
193 * inserted and retry.
195 ld8 r25=[r21] // read L3 PTE again
196 ld8 r26=[r17] // read L2 entry again
198 cmp.ne p6,p7=r26,r20 // did L2 entry change
199 mov r27=PAGE_SHIFT<<2
201 (p6) ptc.l r22,r27 // purge PTE page translation
202 (p7) cmp.ne.or.andcm p6,p7=r25,r18 // did L3 PTE change
204 (p6) ptc.l r16,r27 // purge translation
207 mov pr=r31,-1 // restore predicate registers
212 /////////////////////////////////////////////////////////////////////////////////////////
213 // 0x0400 Entry 1 (size 64 bundles) ITLB (21)
217 * The ITLB handler accesses the L3 PTE via the virtually mapped linear
218 * page table. If a nested TLB miss occurs, we switch into physical
219 * mode, walk the page table, and then re-execute the L3 PTE read
220 * and go on normally after that.
222 mov r16=cr.ifa // get virtual address
223 mov r29=b0 // save b0
224 mov r31=pr // save predicates
226 mov r17=cr.iha // get virtual address of L3 PTE
227 movl r30=1f // load nested fault continuation point
229 1: ld8 r18=[r17] // read L3 PTE
232 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
233 (p6) br.cond.spnt page_fault
239 * Tell the assemblers dependency-violation checker that the above "itc" instructions
240 * cannot possibly affect the following loads:
244 ld8 r19=[r17] // read L3 PTE again and see if same
245 mov r20=PAGE_SHIFT<<2 // setup page size for purge
256 /////////////////////////////////////////////////////////////////////////////////////////
257 // 0x0800 Entry 2 (size 64 bundles) DTLB (9,48)
261 * The DTLB handler accesses the L3 PTE via the virtually mapped linear
262 * page table. If a nested TLB miss occurs, we switch into physical
263 * mode, walk the page table, and then re-execute the L3 PTE read
264 * and go on normally after that.
266 mov r16=cr.ifa // get virtual address
267 mov r29=b0 // save b0
268 mov r31=pr // save predicates
270 mov r17=cr.iha // get virtual address of L3 PTE
271 movl r30=1f // load nested fault continuation point
273 1: ld8 r18=[r17] // read L3 PTE
276 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
277 (p6) br.cond.spnt page_fault
283 * Tell the assemblers dependency-violation checker that the above "itc" instructions
284 * cannot possibly affect the following loads:
288 ld8 r19=[r17] // read L3 PTE again and see if same
289 mov r20=PAGE_SHIFT<<2 // setup page size for purge
300 /////////////////////////////////////////////////////////////////////////////////////////
301 // 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
304 mov r16=cr.ifa // get address that caused the TLB miss
307 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
310 #ifdef CONFIG_DISABLE_VHPT
311 shr.u r22=r16,61 // get the region number into r21
313 cmp.gt p8,p0=6,r22 // user mode
318 (p8) mov r29=b0 // save b0
319 (p8) br.cond.dptk .itlb_fault
321 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
322 and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
323 shr.u r18=r16,57 // move address bit 61 to bit 4
325 andcm r18=0x10,r18 // bit 4=~address-bit(61)
326 cmp.ne p8,p0=r0,r23 // psr.cpl != 0?
327 or r19=r17,r19 // insert PTE control bits into r19
329 or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
330 (p8) br.cond.spnt page_fault
332 itc.i r19 // insert the TLB entry
338 /////////////////////////////////////////////////////////////////////////////////////////
339 // 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
342 mov r16=cr.ifa // get address that caused the TLB miss
345 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
349 #ifdef CONFIG_DISABLE_VHPT
350 shr.u r22=r16,61 // get the region number into r21
352 cmp.gt p8,p0=6,r22 // access to region 0-5
357 (p8) mov r29=b0 // save b0
358 (p8) br.cond.dptk dtlb_fault
360 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
361 and r22=IA64_ISR_CODE_MASK,r20 // get the isr.code field
362 tbit.nz p6,p7=r20,IA64_ISR_SP_BIT // is speculation bit on?
363 shr.u r18=r16,57 // move address bit 61 to bit 4
364 and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
365 tbit.nz p9,p0=r20,IA64_ISR_NA_BIT // is non-access bit on?
367 andcm r18=0x10,r18 // bit 4=~address-bit(61)
369 (p9) cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22 // check isr.code field
370 (p8) br.cond.spnt page_fault
372 dep r21=-1,r21,IA64_PSR_ED_BIT,1
373 or r19=r19,r17 // insert PTE control bits into r19
375 or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
378 (p7) itc.d r19 // insert the TLB entry
384 /////////////////////////////////////////////////////////////////////////////////////////
385 // 0x1400 Entry 5 (size 64 bundles) Data nested TLB (6,45)
386 ENTRY(nested_dtlb_miss)
388 * In the absence of kernel bugs, we get here when the virtually mapped linear
389 * page table is accessed non-speculatively (e.g., in the Dirty-bit, Instruction
390 * Access-bit, or Data Access-bit faults). If the DTLB entry for the virtual page
391 * table is missing, a nested TLB miss fault is triggered and control is
392 * transferred to this point. When this happens, we lookup the pte for the
393 * faulting address by walking the page table in physical mode and return to the
394 * continuation point passed in register r30 (or call page_fault if the address is
397 * Input: r16: faulting address
399 * r30: continuation address
402 * Output: r17: physical address of L3 PTE of faulting address
404 * r30: continuation address
407 * Clobbered: b0, r18, r19, r21, r22, psr.dt (cleared)
409 rsm psr.dt // switch to using physical data addressing
410 mov r19=IA64_KR(PT_BASE) // get the page table base address
411 shl r21=r16,3 // shift bit 60 into sign bit
414 shr.u r17=r16,61 // get the region number into r17
415 extr.u r18=r18,2,6 // get the faulting page size
417 cmp.eq p6,p7=5,r17 // is faulting address in region 5?
418 add r22=-PAGE_SHIFT,r18 // adjustment for hugetlb address
419 add r18=PGDIR_SHIFT-PAGE_SHIFT,r18
423 (p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
426 LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
428 .pred.rel "mutex", p6, p7
429 (p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
430 (p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
432 (p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=PTA + IFA(33,42)*8
433 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8)
434 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
435 shr.u r18=r22,PMD_SHIFT // shift L2 index into position
437 ld8 r17=[r17] // fetch the L1 entry (may be 0)
439 (p7) cmp.eq p6,p7=r17,r0 // was L1 entry NULL?
440 dep r17=r18,r17,3,(PAGE_SHIFT-3) // compute address of L2 page table entry
442 (p7) ld8 r17=[r17] // fetch the L2 entry (may be 0)
443 shr.u r19=r22,PAGE_SHIFT // shift L3 index into position
445 (p7) cmp.eq.or.andcm p6,p7=r17,r0 // was L2 entry NULL?
446 dep r17=r19,r17,3,(PAGE_SHIFT-3) // compute address of L3 page table entry
447 (p6) br.cond.spnt page_fault
449 br.sptk.many b0 // return to continuation point
450 END(nested_dtlb_miss)
453 /////////////////////////////////////////////////////////////////////////////////////////
454 // 0x1800 Entry 6 (size 64 bundles) Instruction Key Miss (24)
460 //-----------------------------------------------------------------------------------
461 // call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
468 alloc r15=ar.pfs,0,0,3,0
471 adds r3=8,r2 // set up second base pointer
473 ssm psr.ic | PSR_DEFAULT_BITS
475 srlz.i // guarantee that interruption collectin is on
477 (p15) ssm psr.i // restore psr.i
478 movl r14=ia64_leave_kernel
483 adds out2=16,r12 // out2 = pointer to pt_regs
484 br.call.sptk.many b6=ia64_do_page_fault // ignore return address
488 /////////////////////////////////////////////////////////////////////////////////////////
489 // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
496 /////////////////////////////////////////////////////////////////////////////////////////
497 // 0x2000 Entry 8 (size 64 bundles) Dirty-bit (54)
501 * What we do here is to simply turn on the dirty bit in the PTE. We need to
502 * update both the page-table and the TLB entry. To efficiently access the PTE,
503 * we address it through the virtual page table. Most likely, the TLB entry for
504 * the relevant virtual page table page is still present in the TLB so we can
505 * normally do this without additional TLB misses. In case the necessary virtual
506 * page table TLB entry isn't present, we take a nested TLB miss hit where we look
507 * up the physical address of the L3 PTE and then continue at label 1 below.
509 mov r16=cr.ifa // get the address that caused the fault
510 movl r30=1f // load continuation point in case of nested fault
512 thash r17=r16 // compute virtual address of L3 PTE
513 mov r29=b0 // save b0 in case of nested fault
514 mov r31=pr // save pr
516 mov r28=ar.ccv // save ar.ccv
519 ;; // avoid RAW on r18
520 mov ar.ccv=r18 // set compare value for cmpxchg
521 or r25=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
523 cmpxchg8.acq r26=[r17],r25,ar.ccv
524 mov r24=PAGE_SHIFT<<2
528 (p6) itc.d r25 // install updated PTE
531 * Tell the assemblers dependency-violation checker that the above "itc" instructions
532 * cannot possibly affect the following loads:
536 ld8 r18=[r17] // read PTE again
538 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
541 mov b0=r29 // restore b0
546 ;; // avoid RAW on r18
547 or r18=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
548 mov b0=r29 // restore b0
550 st8 [r17]=r18 // store back updated PTE
551 itc.d r18 // install updated PTE
553 mov pr=r31,-1 // restore pr
558 /////////////////////////////////////////////////////////////////////////////////////////
559 // 0x2400 Entry 9 (size 64 bundles) Instruction Access-bit (27)
562 // Like Entry 8, except for instruction access
563 mov r16=cr.ifa // get the address that caused the fault
564 movl r30=1f // load continuation point in case of nested fault
565 mov r31=pr // save predicates
566 #ifdef CONFIG_ITANIUM
568 * Erratum 10 (IFA may contain incorrect address) has "NoFix" status.
573 tbit.z p6,p0=r17,IA64_PSR_IS_BIT // IA64 instruction set?
575 (p6) mov r16=r18 // if so, use cr.iip instead of cr.ifa
576 #endif /* CONFIG_ITANIUM */
578 thash r17=r16 // compute virtual address of L3 PTE
579 mov r29=b0 // save b0 in case of nested fault)
581 mov r28=ar.ccv // save ar.ccv
585 mov ar.ccv=r18 // set compare value for cmpxchg
586 or r25=_PAGE_A,r18 // set the accessed bit
588 cmpxchg8.acq r26=[r17],r25,ar.ccv
589 mov r24=PAGE_SHIFT<<2
593 (p6) itc.i r25 // install updated PTE
596 * Tell the assemblers dependency-violation checker that the above "itc" instructions
597 * cannot possibly affect the following loads:
601 ld8 r18=[r17] // read PTE again
603 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
606 mov b0=r29 // restore b0
608 #else /* !CONFIG_SMP */
612 or r18=_PAGE_A,r18 // set the accessed bit
613 mov b0=r29 // restore b0
615 st8 [r17]=r18 // store back updated PTE
616 itc.i r18 // install updated PTE
617 #endif /* !CONFIG_SMP */
623 /////////////////////////////////////////////////////////////////////////////////////////
624 // 0x2800 Entry 10 (size 64 bundles) Data Access-bit (15,55)
627 // Like Entry 8, except for data access
628 mov r16=cr.ifa // get the address that caused the fault
629 movl r30=1f // load continuation point in case of nested fault
631 thash r17=r16 // compute virtual address of L3 PTE
633 mov r29=b0 // save b0 in case of nested fault)
635 mov r28=ar.ccv // save ar.ccv
638 ;; // avoid RAW on r18
639 mov ar.ccv=r18 // set compare value for cmpxchg
640 or r25=_PAGE_A,r18 // set the dirty bit
642 cmpxchg8.acq r26=[r17],r25,ar.ccv
643 mov r24=PAGE_SHIFT<<2
647 (p6) itc.d r25 // install updated PTE
649 * Tell the assemblers dependency-violation checker that the above "itc" instructions
650 * cannot possibly affect the following loads:
654 ld8 r18=[r17] // read PTE again
656 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
663 ;; // avoid RAW on r18
664 or r18=_PAGE_A,r18 // set the accessed bit
666 st8 [r17]=r18 // store back updated PTE
667 itc.d r18 // install updated PTE
669 mov b0=r29 // restore b0
675 /////////////////////////////////////////////////////////////////////////////////////////
676 // 0x2c00 Entry 11 (size 64 bundles) Break instruction (33)
679 * The streamlined system call entry/exit paths only save/restore the initial part
680 * of pt_regs. This implies that the callers of system-calls must adhere to the
681 * normal procedure calling conventions.
683 * Registers to be saved & restored:
684 * CR registers: cr.ipsr, cr.iip, cr.ifs
685 * AR registers: ar.unat, ar.pfs, ar.rsc, ar.rnat, ar.bspstore, ar.fpsr
686 * others: pr, b0, b6, loadrs, r1, r11, r12, r13, r15
687 * Registers to be restored only:
688 * r8-r11: output value from the system call.
690 * During system call exit, scratch registers (including r15) are modified/cleared
691 * to prevent leaking bits from kernel to user level.
694 mov.m r16=IA64_KR(CURRENT) // M2 r16 <- current task (12 cyc)
695 mov r29=cr.ipsr // M2 (12 cyc)
696 mov r31=pr // I0 (2 cyc)
698 mov r17=cr.iim // M2 (2 cyc)
699 mov.m r27=ar.rsc // M2 (12 cyc)
700 mov r18=__IA64_BREAK_SYSCALL // A
703 mov.m r21=ar.fpsr // M2 (12 cyc)
704 mov r19=b6 // I0 (2 cyc)
706 mov.m r23=ar.bspstore // M2 (12 cyc)
707 mov.m r24=ar.rnat // M2 (5 cyc)
708 mov.i r26=ar.pfs // I0 (2 cyc)
712 mov r20=r1 // A save r1
715 movl r30=sys_call_table // X
717 mov r28=cr.iip // M2 (2 cyc)
718 cmp.eq p0,p7=r18,r17 // I0 is this a system call?
719 (p7) br.cond.spnt non_syscall // B no ->
721 // From this point on, we are definitely on the syscall-path
722 // and we can use (non-banked) scratch registers.
724 ///////////////////////////////////////////////////////////////////////
725 mov r1=r16 // A move task-pointer to "addl"-addressable reg
726 mov r2=r16 // A setup r2 for ia64_syscall_setup
727 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 // A r9 = ¤t_thread_info()->flags
729 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
730 adds r15=-1024,r15 // A subtract 1024 from syscall number
731 mov r3=NR_syscalls - 1
733 ld1.bias r17=[r16] // M0|1 r17 = current->thread.on_ustack flag
734 ld4 r9=[r9] // M0|1 r9 = current_thread_info()->flags
735 extr.u r8=r29,41,2 // I0 extract ei field from cr.ipsr
737 shladd r30=r15,3,r30 // A r30 = sys_call_table + 8*(syscall-1024)
738 addl r22=IA64_RBS_OFFSET,r1 // A compute base of RBS
739 cmp.leu p6,p7=r15,r3 // A syscall number in range?
742 lfetch.fault.excl.nt1 [r22] // M0|1 prefetch RBS
743 (p6) ld8 r30=[r30] // M0|1 load address of syscall entry point
744 tnat.nz.or p7,p0=r15 // I0 is syscall nr a NaT?
746 mov.m ar.bspstore=r22 // M2 switch to kernel RBS
747 cmp.eq p8,p9=2,r8 // A isr.ei==2?
750 (p8) mov r8=0 // A clear ei to 0
751 (p7) movl r30=sys_ni_syscall // X
753 (p8) adds r28=16,r28 // A switch cr.iip to next bundle
754 (p9) adds r8=1,r8 // A increment ei to next slot
758 mov.m r25=ar.unat // M2 (5 cyc)
759 dep r29=r8,r29,41,2 // I0 insert new ei into cr.ipsr
760 adds r15=1024,r15 // A restore original syscall number
762 // If any of the above loads miss in L1D, we'll stall here until
765 ///////////////////////////////////////////////////////////////////////
766 st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag
767 mov b6=r30 // I0 setup syscall handler branch reg early
768 cmp.eq pKStk,pUStk=r0,r17 // A were we on kernel stacks already?
770 and r9=_TIF_SYSCALL_TRACEAUDIT,r9 // A mask trace or audit
771 mov r18=ar.bsp // M2 (12 cyc)
772 (pKStk) br.cond.spnt .break_fixup // B we're already in kernel-mode -- fix up RBS
774 .back_from_break_fixup:
775 (pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1 // A compute base of memory stack
776 cmp.eq p14,p0=r9,r0 // A are syscalls being traced/audited?
777 br.call.sptk.many b7=ia64_syscall_setup // B
779 mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0
781 bsw.1 // B (6 cyc) regs are saved, switch to bank 1
784 ssm psr.ic | PSR_DEFAULT_BITS // M2 now it's safe to re-enable intr.-collection
785 movl r3=ia64_ret_from_syscall // X
788 srlz.i // M0 ensure interruption collection is on
789 mov rp=r3 // I0 set the real return addr
790 (p10) br.cond.spnt.many ia64_ret_from_syscall // B return if bad call-frame or r15 is a NaT
792 (p15) ssm psr.i // M2 restore psr.i
793 (p14) br.call.sptk.many b6=b6 // B invoke syscall-handker (ignore return addr)
794 br.cond.spnt.many ia64_trace_syscall // B do syscall-tracing thingamagic
796 ///////////////////////////////////////////////////////////////////////
797 // On entry, we optimistically assumed that we're coming from user-space.
798 // For the rare cases where a system-call is done from within the kernel,
799 // we fix things up at this point:
801 add r1=-IA64_PT_REGS_SIZE,sp // A allocate space for pt_regs structure
802 mov ar.rnat=r24 // M2 restore kernel's AR.RNAT
804 mov ar.bspstore=r23 // M2 restore kernel's AR.BSPSTORE
805 br.cond.sptk .back_from_break_fixup
809 /////////////////////////////////////////////////////////////////////////////////////////
810 // 0x3000 Entry 12 (size 64 bundles) External Interrupt (4)
813 mov r31=pr // prepare to save predicates
815 SAVE_MIN_WITH_COVER // uses r31; defines r2 and r3
816 ssm psr.ic | PSR_DEFAULT_BITS
818 adds r3=8,r2 // set up second base pointer for SAVE_REST
819 srlz.i // ensure everybody knows psr.ic is back on
823 alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
824 mov out0=cr.ivr // pass cr.ivr as first arg
825 add out1=16,sp // pass pointer to pt_regs as second arg
827 srlz.d // make sure we see the effect of cr.ivr
828 movl r14=ia64_leave_kernel
831 br.call.sptk.many b6=ia64_handle_irq
835 /////////////////////////////////////////////////////////////////////////////////////////
836 // 0x3400 Entry 13 (size 64 bundles) Reserved
841 /////////////////////////////////////////////////////////////////////////////////////////
842 // 0x3800 Entry 14 (size 64 bundles) Reserved
847 * There is no particular reason for this code to be here, other than that
848 * there happens to be space here that would go unused otherwise. If this
849 * fault ever gets "unreserved", simply moved the following code to a more
852 * ia64_syscall_setup() is a separate subroutine so that it can
853 * allocate stacked registers so it can safely demine any
854 * potential NaT values from the input registers.
857 * - executing on bank 0 or bank 1 register set (doesn't matter)
858 * - r1: stack pointer
859 * - r2: current task pointer
861 * - r11: original contents (saved ar.pfs to be saved)
862 * - r12: original contents (sp to be saved)
863 * - r13: original contents (tp to be saved)
864 * - r15: original contents (syscall # to be saved)
865 * - r18: saved bsp (after switching to kernel stack)
867 * - r20: saved r1 (gp)
868 * - r21: saved ar.fpsr
869 * - r22: kernel's register backing store base (krbs_base)
870 * - r23: saved ar.bspstore
871 * - r24: saved ar.rnat
872 * - r25: saved ar.unat
873 * - r26: saved ar.pfs
874 * - r27: saved ar.rsc
875 * - r28: saved cr.iip
876 * - r29: saved cr.ipsr
878 * - b0: original contents (to be saved)
880 * - p10: TRUE if syscall is invoked with more than 8 out
881 * registers or r15's Nat is true
883 * - r3: preserved (same as on entry)
884 * - r8: -EINVAL if p10 is true
885 * - r12: points to kernel stack
886 * - r13: points to current task
887 * - r14: preserved (same as on entry)
889 * - p15: TRUE if interrupts need to be re-enabled
890 * - ar.fpsr: set to kernel settings
891 * - b6: preserved (same as on entry)
893 GLOBAL_ENTRY(ia64_syscall_setup)
895 # error This code assumes that b6 is the first field in pt_regs.
897 st8 [r1]=r19 // save b6
898 add r16=PT(CR_IPSR),r1 // initialize first base pointer
899 add r17=PT(R11),r1 // initialize second base pointer
901 alloc r19=ar.pfs,8,0,0,0 // ensure in0-in7 are writable
902 st8 [r16]=r29,PT(AR_PFS)-PT(CR_IPSR) // save cr.ipsr
905 st8.spill [r17]=r11,PT(CR_IIP)-PT(R11) // save r11
907 (pKStk) mov r18=r0 // make sure r18 isn't NaT
910 st8 [r16]=r26,PT(CR_IFS)-PT(AR_PFS) // save ar.pfs
911 st8 [r17]=r28,PT(AR_UNAT)-PT(CR_IIP) // save cr.iip
912 mov r28=b0 // save b0 (2 cyc)
915 st8 [r17]=r25,PT(AR_RSC)-PT(AR_UNAT) // save ar.unat
916 dep r19=0,r19,38,26 // clear all bits but 0..37 [I0]
920 st8 [r16]=r19,PT(AR_RNAT)-PT(CR_IFS) // store ar.pfs.pfm in cr.ifs
921 extr.u r11=r19,7,7 // I0 // get sol of ar.pfs
922 and r8=0x7f,r19 // A // get sof of ar.pfs
924 st8 [r17]=r27,PT(AR_BSPSTORE)-PT(AR_RSC)// save ar.rsc
925 tbit.nz p15,p0=r29,IA64_PSR_I_BIT // I0
929 (pUStk) sub r18=r18,r22 // r18=RSE.ndirty*8
933 (pKStk) adds r16=PT(PR)-PT(AR_RNAT),r16 // skip over ar_rnat field
934 (pKStk) adds r17=PT(B0)-PT(AR_BSPSTORE),r17 // skip over ar_bspstore field
938 tnat.nz p12,p0=in4 // [I0]
941 (pUStk) st8 [r16]=r24,PT(PR)-PT(AR_RNAT) // save ar.rnat
942 (pUStk) st8 [r17]=r23,PT(B0)-PT(AR_BSPSTORE) // save ar.bspstore
943 shl r18=r18,16 // compute ar.rsc to be used for "loadrs"
945 st8 [r16]=r31,PT(LOADRS)-PT(PR) // save predicates
946 st8 [r17]=r28,PT(R1)-PT(B0) // save b0
947 tnat.nz p13,p0=in5 // [I0]
949 st8 [r16]=r18,PT(R12)-PT(LOADRS) // save ar.rsc value for "loadrs"
950 st8.spill [r17]=r20,PT(R13)-PT(R1) // save original r1
954 .mem.offset 0,0; st8.spill [r16]=r12,PT(AR_FPSR)-PT(R12) // save r12
955 .mem.offset 8,0; st8.spill [r17]=r13,PT(R15)-PT(R13) // save r13
958 st8 [r16]=r21,PT(R8)-PT(AR_FPSR) // save ar.fpsr
960 cmp.lt p10,p9=r11,r8 // frame size can't be more than local+8
963 (p9) tnat.nz p10,p0=r15
964 adds r12=-16,r1 // switch to kernel memory stack (with 16 bytes of scratch)
966 st8.spill [r17]=r15 // save r15
970 mov r13=r2 // establish `current'
971 movl r1=__gp // establish kernel global pointer
973 st8 [r16]=r8 // ensure pt_regs.r8 != 0 (see handle_syscall_error)
977 cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
978 movl r17=FPSR_DEFAULT
980 mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
983 END(ia64_syscall_setup)
986 /////////////////////////////////////////////////////////////////////////////////////////
987 // 0x3c00 Entry 15 (size 64 bundles) Reserved
992 * Squatting in this space ...
994 * This special case dispatcher for illegal operation faults allows preserved
995 * registers to be modified through a callback function (asm only) that is handed
996 * back from the fault handler in r8. Up to three arguments can be passed to the
997 * callback function by returning an aggregate with the callback as its first
998 * element, followed by the arguments.
1000 ENTRY(dispatch_illegal_op_fault)
1004 ssm psr.ic | PSR_DEFAULT_BITS
1006 srlz.i // guarantee that interruption collection is on
1008 (p15) ssm psr.i // restore psr.i
1009 adds r3=8,r2 // set up second base pointer for SAVE_REST
1011 alloc r14=ar.pfs,0,0,1,0 // must be first in insn group
1015 PT_REGS_UNWIND_INFO(0)
1017 br.call.sptk.many rp=ia64_illegal_op_fault
1019 alloc r14=ar.pfs,0,0,3,0 // must be first in insn group
1023 movl r15=ia64_leave_kernel
1029 (p6) br.call.dpnt.many b6=b6 // call returns to ia64_leave_kernel
1030 br.sptk.many ia64_leave_kernel
1031 END(dispatch_illegal_op_fault)
1033 .org ia64_ivt+0x4000
1034 /////////////////////////////////////////////////////////////////////////////////////////
1035 // 0x4000 Entry 16 (size 64 bundles) Reserved
1039 .org ia64_ivt+0x4400
1040 /////////////////////////////////////////////////////////////////////////////////////////
1041 // 0x4400 Entry 17 (size 64 bundles) Reserved
1046 mov ar.rsc=r27 // restore ar.rsc before SAVE_MIN_WITH_COVER
1050 // There is no particular reason for this code to be here, other than that
1051 // there happens to be space here that would go unused otherwise. If this
1052 // fault ever gets "unreserved", simply moved the following code to a more
1055 alloc r14=ar.pfs,0,0,2,0
1058 adds r3=8,r2 // set up second base pointer for SAVE_REST
1060 ssm psr.ic | PSR_DEFAULT_BITS
1062 srlz.i // guarantee that interruption collection is on
1064 (p15) ssm psr.i // restore psr.i
1065 movl r15=ia64_leave_kernel
1070 br.call.sptk.many b6=ia64_bad_break // avoid WAW on CFM and ignore return addr
1073 .org ia64_ivt+0x4800
1074 /////////////////////////////////////////////////////////////////////////////////////////
1075 // 0x4800 Entry 18 (size 64 bundles) Reserved
1080 * There is no particular reason for this code to be here, other than that
1081 * there happens to be space here that would go unused otherwise. If this
1082 * fault ever gets "unreserved", simply moved the following code to a more
1086 ENTRY(dispatch_unaligned_handler)
1089 alloc r14=ar.pfs,0,0,2,0 // now it's safe (must be first in insn group!)
1093 ssm psr.ic | PSR_DEFAULT_BITS
1095 srlz.i // guarantee that interruption collection is on
1097 (p15) ssm psr.i // restore psr.i
1098 adds r3=8,r2 // set up second base pointer
1101 movl r14=ia64_leave_kernel
1104 br.sptk.many ia64_prepare_handle_unaligned
1105 END(dispatch_unaligned_handler)
1107 .org ia64_ivt+0x4c00
1108 /////////////////////////////////////////////////////////////////////////////////////////
1109 // 0x4c00 Entry 19 (size 64 bundles) Reserved
1114 * There is no particular reason for this code to be here, other than that
1115 * there happens to be space here that would go unused otherwise. If this
1116 * fault ever gets "unreserved", simply moved the following code to a more
1120 ENTRY(dispatch_to_fault_handler)
1124 * r19: fault vector number (e.g., 24 for General Exception)
1125 * r31: contains saved predicates (pr)
1127 SAVE_MIN_WITH_COVER_R19
1128 alloc r14=ar.pfs,0,0,5,0
1135 ssm psr.ic | PSR_DEFAULT_BITS
1137 srlz.i // guarantee that interruption collection is on
1139 (p15) ssm psr.i // restore psr.i
1140 adds r3=8,r2 // set up second base pointer for SAVE_REST
1143 movl r14=ia64_leave_kernel
1146 br.call.sptk.many b6=ia64_fault
1147 END(dispatch_to_fault_handler)
1150 // --- End of long entries, Beginning of short entries
1153 .org ia64_ivt+0x5000
1154 /////////////////////////////////////////////////////////////////////////////////////////
1155 // 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
1156 ENTRY(page_not_present)
1161 * The Linux page fault handler doesn't expect non-present pages to be in
1162 * the TLB. Flush the existing entry now, so we meet that expectation.
1164 mov r17=PAGE_SHIFT<<2
1170 br.sptk.many page_fault
1171 END(page_not_present)
1173 .org ia64_ivt+0x5100
1174 /////////////////////////////////////////////////////////////////////////////////////////
1175 // 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
1176 ENTRY(key_permission)
1183 br.sptk.many page_fault
1186 .org ia64_ivt+0x5200
1187 /////////////////////////////////////////////////////////////////////////////////////////
1188 // 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
1189 ENTRY(iaccess_rights)
1196 br.sptk.many page_fault
1199 .org ia64_ivt+0x5300
1200 /////////////////////////////////////////////////////////////////////////////////////////
1201 // 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
1202 ENTRY(daccess_rights)
1209 br.sptk.many page_fault
1212 .org ia64_ivt+0x5400
1213 /////////////////////////////////////////////////////////////////////////////////////////
1214 // 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
1215 ENTRY(general_exception)
1221 (p6) br.sptk.many dispatch_illegal_op_fault
1223 mov r19=24 // fault number
1224 br.sptk.many dispatch_to_fault_handler
1225 END(general_exception)
1227 .org ia64_ivt+0x5500
1228 /////////////////////////////////////////////////////////////////////////////////////////
1229 // 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35)
1230 ENTRY(disabled_fp_reg)
1232 rsm psr.dfh // ensure we can access fph
1237 br.sptk.many dispatch_to_fault_handler
1238 END(disabled_fp_reg)
1240 .org ia64_ivt+0x5600
1241 /////////////////////////////////////////////////////////////////////////////////////////
1242 // 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50)
1243 ENTRY(nat_consumption)
1248 mov r31=pr // save PR
1250 and r18=0xf,r17 // r18 = cr.ipsr.code{3:0}
1251 tbit.z p6,p0=r17,IA64_ISR_NA_BIT
1253 cmp.ne.or p6,p0=IA64_ISR_CODE_LFETCH,r18
1254 dep r16=-1,r16,IA64_PSR_ED_BIT,1
1255 (p6) br.cond.spnt 1f // branch if (cr.ispr.na == 0 || cr.ipsr.code{3:0} != LFETCH)
1257 mov cr.ipsr=r16 // set cr.ipsr.na
1265 END(nat_consumption)
1267 .org ia64_ivt+0x5700
1268 /////////////////////////////////////////////////////////////////////////////////////////
1269 // 0x5700 Entry 27 (size 16 bundles) Speculation (40)
1270 ENTRY(speculation_vector)
1273 * A [f]chk.[as] instruction needs to take the branch to the recovery code but
1274 * this part of the architecture is not implemented in hardware on some CPUs, such
1275 * as Itanium. Thus, in general we need to emulate the behavior. IIM contains
1276 * the relative target (not yet sign extended). So after sign extending it we
1277 * simply add it to IIP. We also need to reset the EI field of the IPSR to zero,
1278 * i.e., the slot to restart into.
1280 * cr.imm contains zero_ext(imm21)
1285 shl r18=r18,43 // put sign bit in position (43=64-21)
1289 shr r18=r18,39 // sign extend (39=43-4)
1292 add r17=r17,r18 // now add the offset
1295 dep r16=0,r16,41,2 // clear EI
1302 END(speculation_vector)
1304 .org ia64_ivt+0x5800
1305 /////////////////////////////////////////////////////////////////////////////////////////
1306 // 0x5800 Entry 28 (size 16 bundles) Reserved
1310 .org ia64_ivt+0x5900
1311 /////////////////////////////////////////////////////////////////////////////////////////
1312 // 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
1318 .org ia64_ivt+0x5a00
1319 /////////////////////////////////////////////////////////////////////////////////////////
1320 // 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57)
1321 ENTRY(unaligned_access)
1324 mov r31=pr // prepare to save predicates
1326 br.sptk.many dispatch_unaligned_handler
1327 END(unaligned_access)
1329 .org ia64_ivt+0x5b00
1330 /////////////////////////////////////////////////////////////////////////////////////////
1331 // 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57)
1332 ENTRY(unsupported_data_reference)
1335 END(unsupported_data_reference)
1337 .org ia64_ivt+0x5c00
1338 /////////////////////////////////////////////////////////////////////////////////////////
1339 // 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64)
1340 ENTRY(floating_point_fault)
1343 END(floating_point_fault)
1345 .org ia64_ivt+0x5d00
1346 /////////////////////////////////////////////////////////////////////////////////////////
1347 // 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66)
1348 ENTRY(floating_point_trap)
1351 END(floating_point_trap)
1353 .org ia64_ivt+0x5e00
1354 /////////////////////////////////////////////////////////////////////////////////////////
1355 // 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Transfer Trap (66)
1356 ENTRY(lower_privilege_trap)
1359 END(lower_privilege_trap)
1361 .org ia64_ivt+0x5f00
1362 /////////////////////////////////////////////////////////////////////////////////////////
1363 // 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68)
1364 ENTRY(taken_branch_trap)
1367 END(taken_branch_trap)
1369 .org ia64_ivt+0x6000
1370 /////////////////////////////////////////////////////////////////////////////////////////
1371 // 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69)
1372 ENTRY(single_step_trap)
1375 END(single_step_trap)
1377 .org ia64_ivt+0x6100
1378 /////////////////////////////////////////////////////////////////////////////////////////
1379 // 0x6100 Entry 37 (size 16 bundles) Reserved
1383 .org ia64_ivt+0x6200
1384 /////////////////////////////////////////////////////////////////////////////////////////
1385 // 0x6200 Entry 38 (size 16 bundles) Reserved
1389 .org ia64_ivt+0x6300
1390 /////////////////////////////////////////////////////////////////////////////////////////
1391 // 0x6300 Entry 39 (size 16 bundles) Reserved
1395 .org ia64_ivt+0x6400
1396 /////////////////////////////////////////////////////////////////////////////////////////
1397 // 0x6400 Entry 40 (size 16 bundles) Reserved
1401 .org ia64_ivt+0x6500
1402 /////////////////////////////////////////////////////////////////////////////////////////
1403 // 0x6500 Entry 41 (size 16 bundles) Reserved
1407 .org ia64_ivt+0x6600
1408 /////////////////////////////////////////////////////////////////////////////////////////
1409 // 0x6600 Entry 42 (size 16 bundles) Reserved
1413 .org ia64_ivt+0x6700
1414 /////////////////////////////////////////////////////////////////////////////////////////
1415 // 0x6700 Entry 43 (size 16 bundles) Reserved
1419 .org ia64_ivt+0x6800
1420 /////////////////////////////////////////////////////////////////////////////////////////
1421 // 0x6800 Entry 44 (size 16 bundles) Reserved
1425 .org ia64_ivt+0x6900
1426 /////////////////////////////////////////////////////////////////////////////////////////
1427 // 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)
1428 ENTRY(ia32_exception)
1433 .org ia64_ivt+0x6a00
1434 /////////////////////////////////////////////////////////////////////////////////////////
1435 // 0x6a00 Entry 46 (size 16 bundles) IA-32 Intercept (30,31,59,70,71)
1436 ENTRY(ia32_intercept)
1438 #ifdef CONFIG_IA32_SUPPORT
1442 extr.u r17=r16,16,8 // get ISR.code
1444 mov r19=cr.iim // old eflag value
1447 (p6) br.cond.spnt 1f // not a system flag fault
1450 extr.u r17=r16,18,1 // get the eflags.ac bit
1453 (p6) br.cond.spnt 1f // eflags.ac bit didn't change
1455 mov pr=r31,-1 // restore predicate registers
1459 #endif // CONFIG_IA32_SUPPORT
1463 .org ia64_ivt+0x6b00
1464 /////////////////////////////////////////////////////////////////////////////////////////
1465 // 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt (74)
1466 ENTRY(ia32_interrupt)
1468 #ifdef CONFIG_IA32_SUPPORT
1470 br.sptk.many dispatch_to_ia32_handler
1476 .org ia64_ivt+0x6c00
1477 /////////////////////////////////////////////////////////////////////////////////////////
1478 // 0x6c00 Entry 48 (size 16 bundles) Reserved
1482 .org ia64_ivt+0x6d00
1483 /////////////////////////////////////////////////////////////////////////////////////////
1484 // 0x6d00 Entry 49 (size 16 bundles) Reserved
1488 .org ia64_ivt+0x6e00
1489 /////////////////////////////////////////////////////////////////////////////////////////
1490 // 0x6e00 Entry 50 (size 16 bundles) Reserved
1494 .org ia64_ivt+0x6f00
1495 /////////////////////////////////////////////////////////////////////////////////////////
1496 // 0x6f00 Entry 51 (size 16 bundles) Reserved
1500 .org ia64_ivt+0x7000
1501 /////////////////////////////////////////////////////////////////////////////////////////
1502 // 0x7000 Entry 52 (size 16 bundles) Reserved
1506 .org ia64_ivt+0x7100
1507 /////////////////////////////////////////////////////////////////////////////////////////
1508 // 0x7100 Entry 53 (size 16 bundles) Reserved
1512 .org ia64_ivt+0x7200
1513 /////////////////////////////////////////////////////////////////////////////////////////
1514 // 0x7200 Entry 54 (size 16 bundles) Reserved
1518 .org ia64_ivt+0x7300
1519 /////////////////////////////////////////////////////////////////////////////////////////
1520 // 0x7300 Entry 55 (size 16 bundles) Reserved
1524 .org ia64_ivt+0x7400
1525 /////////////////////////////////////////////////////////////////////////////////////////
1526 // 0x7400 Entry 56 (size 16 bundles) Reserved
1530 .org ia64_ivt+0x7500
1531 /////////////////////////////////////////////////////////////////////////////////////////
1532 // 0x7500 Entry 57 (size 16 bundles) Reserved
1536 .org ia64_ivt+0x7600
1537 /////////////////////////////////////////////////////////////////////////////////////////
1538 // 0x7600 Entry 58 (size 16 bundles) Reserved
1542 .org ia64_ivt+0x7700
1543 /////////////////////////////////////////////////////////////////////////////////////////
1544 // 0x7700 Entry 59 (size 16 bundles) Reserved
1548 .org ia64_ivt+0x7800
1549 /////////////////////////////////////////////////////////////////////////////////////////
1550 // 0x7800 Entry 60 (size 16 bundles) Reserved
1554 .org ia64_ivt+0x7900
1555 /////////////////////////////////////////////////////////////////////////////////////////
1556 // 0x7900 Entry 61 (size 16 bundles) Reserved
1560 .org ia64_ivt+0x7a00
1561 /////////////////////////////////////////////////////////////////////////////////////////
1562 // 0x7a00 Entry 62 (size 16 bundles) Reserved
1566 .org ia64_ivt+0x7b00
1567 /////////////////////////////////////////////////////////////////////////////////////////
1568 // 0x7b00 Entry 63 (size 16 bundles) Reserved
1572 .org ia64_ivt+0x7c00
1573 /////////////////////////////////////////////////////////////////////////////////////////
1574 // 0x7c00 Entry 64 (size 16 bundles) Reserved
1578 .org ia64_ivt+0x7d00
1579 /////////////////////////////////////////////////////////////////////////////////////////
1580 // 0x7d00 Entry 65 (size 16 bundles) Reserved
1584 .org ia64_ivt+0x7e00
1585 /////////////////////////////////////////////////////////////////////////////////////////
1586 // 0x7e00 Entry 66 (size 16 bundles) Reserved
1590 .org ia64_ivt+0x7f00
1591 /////////////////////////////////////////////////////////////////////////////////////////
1592 // 0x7f00 Entry 67 (size 16 bundles) Reserved
1596 #ifdef CONFIG_IA32_SUPPORT
1599 * There is no particular reason for this code to be here, other than that
1600 * there happens to be space here that would go unused otherwise. If this
1601 * fault ever gets "unreserved", simply moved the following code to a more
1605 // IA32 interrupt entry point
1607 ENTRY(dispatch_to_ia32_handler)
1611 ssm psr.ic | PSR_DEFAULT_BITS
1613 srlz.i // guarantee that interruption collection is on
1616 adds r3=8,r2 // Base pointer for SAVE_REST
1621 shr r14=r14,16 // Get interrupt number
1623 cmp.ne p6,p0=r14,r15
1624 (p6) br.call.dpnt.many b6=non_ia32_syscall
1626 adds r14=IA64_PT_REGS_R8_OFFSET + 16,sp // 16 byte hole per SW conventions
1627 adds r15=IA64_PT_REGS_R1_OFFSET + 16,sp
1629 cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
1630 ld8 r8=[r14] // get r8
1632 st8 [r15]=r8 // save original EAX in r1 (IA32 procs don't use the GP)
1634 alloc r15=ar.pfs,0,0,6,0 // must first in an insn group
1636 ld4 r8=[r14],8 // r8 == eax (syscall number)
1637 mov r15=IA32_NR_syscalls
1639 cmp.ltu.unc p6,p7=r8,r15
1640 ld4 out1=[r14],8 // r9 == ecx
1642 ld4 out2=[r14],8 // r10 == edx
1644 ld4 out0=[r14] // r11 == ebx
1645 adds r14=(IA64_PT_REGS_R13_OFFSET) + 16,sp
1647 ld4 out5=[r14],PT(R14)-PT(R13) // r13 == ebp
1649 ld4 out3=[r14],PT(R15)-PT(R14) // r14 == esi
1650 adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
1652 ld4 out4=[r14] // r15 == edi
1653 movl r16=ia32_syscall_table
1655 (p6) shladd r16=r8,3,r16 // force ni_syscall if not valid syscall number
1656 ld4 r2=[r2] // r2 = current_thread_info()->flags
1659 and r2=_TIF_SYSCALL_TRACEAUDIT,r2 // mask trace or audit
1662 movl r15=ia32_ret_from_syscall
1666 (p8) br.call.sptk.many b6=b6
1667 br.cond.sptk ia32_trace_syscall
1670 alloc r15=ar.pfs,0,0,2,0
1671 mov out0=r14 // interrupt #
1672 add out1=16,sp // pointer to pt_regs
1673 ;; // avoid WAW on CFM
1674 br.call.sptk.many rp=ia32_bad_interrupt
1675 .ret1: movl r15=ia64_leave_kernel
1679 END(dispatch_to_ia32_handler)
1681 #endif /* CONFIG_IA32_SUPPORT */