2 * arch/ia64/kernel/ivt.S
4 * Copyright (C) 1998-2001, 2003 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/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
72 #define MINSTATE_VIRT /* needed by minstate.h */
77 mov r19=n;; /* prepare to save predicates */ \
78 br.sptk.many dispatch_to_fault_handler
80 .section .text.ivt,"ax"
82 .align 32768 // align on 32KB boundary
85 /////////////////////////////////////////////////////////////////////////////////////////
86 // 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)
90 * The VHPT vector is invoked when the TLB entry for the virtual page table
91 * is missing. This happens only as a result of a previous
92 * (the "original") TLB miss, which may either be caused by an instruction
93 * fetch or a data access (or non-access).
95 * What we do here is normal TLB miss handing for the _original_ miss, followed
96 * by inserting the TLB entry for the virtual page table page that the VHPT
97 * walker was attempting to access. The latter gets inserted as long
98 * as both L1 and L2 have valid mappings for the faulting address.
99 * The TLB entry for the original miss gets inserted only if
100 * the L3 entry indicates that the page is present.
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 L1, L2, or L3 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 bits 33-63 of the faulting address
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=PTA + IFA(33,42)*8
142 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8)
143 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
144 shr.u r18=r22,PMD_SHIFT // shift L2 index into position
146 ld8 r17=[r17] // fetch the L1 entry (may be 0)
148 (p7) cmp.eq p6,p7=r17,r0 // was L1 entry NULL?
149 dep r17=r18,r17,3,(PAGE_SHIFT-3) // compute address of L2 page table entry
151 (p7) ld8 r20=[r17] // fetch the L2 entry (may be 0)
152 shr.u r19=r22,PAGE_SHIFT // shift L3 index into position
154 (p7) cmp.eq.or.andcm p6,p7=r20,r0 // was L2 entry NULL?
155 dep r21=r19,r20,3,(PAGE_SHIFT-3) // compute address of L3 page table entry
157 (p7) ld8 r18=[r21] // read the L3 PTE
158 mov r19=cr.isr // cr.isr bit 0 tells us if this is an insn miss
160 (p7) tbit.z p6,p7=r18,_PAGE_P_BIT // page present bit cleared?
161 mov r22=cr.iha // get the VHPT address that caused the TLB miss
162 ;; // avoid RAW on p7
163 (p7) tbit.nz.unc p10,p11=r19,32 // is it an instruction TLB miss?
164 dep r23=0,r20,0,PAGE_SHIFT // clear low bits to get page address
166 (p10) itc.i r18 // insert the instruction TLB entry
167 (p11) itc.d r18 // insert the data TLB entry
168 (p6) br.cond.spnt.many page_fault // handle bad address/page not present (page fault)
171 #ifdef CONFIG_HUGETLB_PAGE
172 (p8) mov cr.itir=r25 // change to default page-size for VHPT
176 * Now compute and insert the TLB entry for the virtual page table. We never
177 * execute in a page table page so there is no need to set the exception deferral
180 adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
186 * Tell the assemblers dependency-violation checker that the above "itc" instructions
187 * cannot possibly affect the following loads:
192 * Re-check L2 and L3 pagetable. If they changed, we may have received a ptc.g
193 * between reading the pagetable and the "itc". If so, flush the entry we
194 * inserted and retry.
196 ld8 r25=[r21] // read L3 PTE again
197 ld8 r26=[r17] // read L2 entry again
199 cmp.ne p6,p7=r26,r20 // did L2 entry change
200 mov r27=PAGE_SHIFT<<2
202 (p6) ptc.l r22,r27 // purge PTE page translation
203 (p7) cmp.ne.or.andcm p6,p7=r25,r18 // did L3 PTE change
205 (p6) ptc.l r16,r27 // purge translation
208 mov pr=r31,-1 // restore predicate registers
213 /////////////////////////////////////////////////////////////////////////////////////////
214 // 0x0400 Entry 1 (size 64 bundles) ITLB (21)
218 * The ITLB handler accesses the L3 PTE via the virtually mapped linear
219 * page table. If a nested TLB miss occurs, we switch into physical
220 * mode, walk the page table, and then re-execute the L3 PTE read
221 * and go on normally after that.
223 mov r16=cr.ifa // get virtual address
224 mov r29=b0 // save b0
225 mov r31=pr // save predicates
227 mov r17=cr.iha // get virtual address of L3 PTE
228 movl r30=1f // load nested fault continuation point
230 1: ld8 r18=[r17] // read L3 PTE
233 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
234 (p6) br.cond.spnt page_fault
240 * Tell the assemblers dependency-violation checker that the above "itc" instructions
241 * cannot possibly affect the following loads:
245 ld8 r19=[r17] // read L3 PTE again and see if same
246 mov r20=PAGE_SHIFT<<2 // setup page size for purge
257 /////////////////////////////////////////////////////////////////////////////////////////
258 // 0x0800 Entry 2 (size 64 bundles) DTLB (9,48)
262 * The DTLB handler accesses the L3 PTE via the virtually mapped linear
263 * page table. If a nested TLB miss occurs, we switch into physical
264 * mode, walk the page table, and then re-execute the L3 PTE read
265 * and go on normally after that.
267 mov r16=cr.ifa // get virtual address
268 mov r29=b0 // save b0
269 mov r31=pr // save predicates
271 mov r17=cr.iha // get virtual address of L3 PTE
272 movl r30=1f // load nested fault continuation point
274 1: ld8 r18=[r17] // read L3 PTE
277 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
278 (p6) br.cond.spnt page_fault
284 * Tell the assemblers dependency-violation checker that the above "itc" instructions
285 * cannot possibly affect the following loads:
289 ld8 r19=[r17] // read L3 PTE again and see if same
290 mov r20=PAGE_SHIFT<<2 // setup page size for purge
301 /////////////////////////////////////////////////////////////////////////////////////////
302 // 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
305 mov r16=cr.ifa // get address that caused the TLB miss
308 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
311 #ifdef CONFIG_DISABLE_VHPT
312 shr.u r22=r16,61 // get the region number into r21
314 cmp.gt p8,p0=6,r22 // user mode
319 (p8) mov r29=b0 // save b0
320 (p8) br.cond.dptk .itlb_fault
322 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
323 and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
324 shr.u r18=r16,57 // move address bit 61 to bit 4
326 andcm r18=0x10,r18 // bit 4=~address-bit(61)
327 cmp.ne p8,p0=r0,r23 // psr.cpl != 0?
328 or r19=r17,r19 // insert PTE control bits into r19
330 or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
331 (p8) br.cond.spnt page_fault
333 itc.i r19 // insert the TLB entry
339 /////////////////////////////////////////////////////////////////////////////////////////
340 // 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
343 mov r16=cr.ifa // get address that caused the TLB miss
346 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
350 #ifdef CONFIG_DISABLE_VHPT
351 shr.u r22=r16,61 // get the region number into r21
353 cmp.gt p8,p0=6,r22 // access to region 0-5
358 (p8) mov r29=b0 // save b0
359 (p8) br.cond.dptk dtlb_fault
361 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
362 and r22=IA64_ISR_CODE_MASK,r20 // get the isr.code field
363 tbit.nz p6,p7=r20,IA64_ISR_SP_BIT // is speculation bit on?
364 shr.u r18=r16,57 // move address bit 61 to bit 4
365 and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
366 tbit.nz p9,p0=r20,IA64_ISR_NA_BIT // is non-access bit on?
368 andcm r18=0x10,r18 // bit 4=~address-bit(61)
370 (p9) cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22 // check isr.code field
371 (p8) br.cond.spnt page_fault
373 dep r21=-1,r21,IA64_PSR_ED_BIT,1
374 or r19=r19,r17 // insert PTE control bits into r19
376 or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
379 (p7) itc.d r19 // insert the TLB entry
385 /////////////////////////////////////////////////////////////////////////////////////////
386 // 0x1400 Entry 5 (size 64 bundles) Data nested TLB (6,45)
387 ENTRY(nested_dtlb_miss)
389 * In the absence of kernel bugs, we get here when the virtually mapped linear
390 * page table is accessed non-speculatively (e.g., in the Dirty-bit, Instruction
391 * Access-bit, or Data Access-bit faults). If the DTLB entry for the virtual page
392 * table is missing, a nested TLB miss fault is triggered and control is
393 * transferred to this point. When this happens, we lookup the pte for the
394 * faulting address by walking the page table in physical mode and return to the
395 * continuation point passed in register r30 (or call page_fault if the address is
398 * Input: r16: faulting address
400 * r30: continuation address
403 * Output: r17: physical address of L3 PTE of faulting address
405 * r30: continuation address
408 * Clobbered: b0, r18, r19, r21, r22, psr.dt (cleared)
410 rsm psr.dt // switch to using physical data addressing
411 mov r19=IA64_KR(PT_BASE) // get the page table base address
412 shl r21=r16,3 // shift bit 60 into sign bit
415 shr.u r17=r16,61 // get the region number into r17
416 extr.u r18=r18,2,6 // get the faulting page size
418 cmp.eq p6,p7=5,r17 // is faulting address in region 5?
419 add r22=-PAGE_SHIFT,r18 // adjustment for hugetlb address
420 add r18=PGDIR_SHIFT-PAGE_SHIFT,r18
424 (p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
427 LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
429 .pred.rel "mutex", p6, p7
430 (p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
431 (p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
433 (p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=PTA + IFA(33,42)*8
434 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8)
435 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
436 shr.u r18=r22,PMD_SHIFT // shift L2 index into position
438 ld8 r17=[r17] // fetch the L1 entry (may be 0)
440 (p7) cmp.eq p6,p7=r17,r0 // was L1 entry NULL?
441 dep r17=r18,r17,3,(PAGE_SHIFT-3) // compute address of L2 page table entry
443 (p7) ld8 r17=[r17] // fetch the L2 entry (may be 0)
444 shr.u r19=r22,PAGE_SHIFT // shift L3 index into position
446 (p7) cmp.eq.or.andcm p6,p7=r17,r0 // was L2 entry NULL?
447 dep r17=r19,r17,3,(PAGE_SHIFT-3) // compute address of L3 page table entry
448 (p6) br.cond.spnt page_fault
450 br.sptk.many b0 // return to continuation point
451 END(nested_dtlb_miss)
454 /////////////////////////////////////////////////////////////////////////////////////////
455 // 0x1800 Entry 6 (size 64 bundles) Instruction Key Miss (24)
461 //-----------------------------------------------------------------------------------
462 // call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
469 alloc r15=ar.pfs,0,0,3,0
472 adds r3=8,r2 // set up second base pointer
474 ssm psr.ic | PSR_DEFAULT_BITS
476 srlz.i // guarantee that interruption collectin is on
478 (p15) ssm psr.i // restore psr.i
479 movl r14=ia64_leave_kernel
484 adds out2=16,r12 // out2 = pointer to pt_regs
485 br.call.sptk.many b6=ia64_do_page_fault // ignore return address
489 /////////////////////////////////////////////////////////////////////////////////////////
490 // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
497 /////////////////////////////////////////////////////////////////////////////////////////
498 // 0x2000 Entry 8 (size 64 bundles) Dirty-bit (54)
502 * What we do here is to simply turn on the dirty bit in the PTE. We need to
503 * update both the page-table and the TLB entry. To efficiently access the PTE,
504 * we address it through the virtual page table. Most likely, the TLB entry for
505 * the relevant virtual page table page is still present in the TLB so we can
506 * normally do this without additional TLB misses. In case the necessary virtual
507 * page table TLB entry isn't present, we take a nested TLB miss hit where we look
508 * up the physical address of the L3 PTE and then continue at label 1 below.
510 mov r16=cr.ifa // get the address that caused the fault
511 movl r30=1f // load continuation point in case of nested fault
513 thash r17=r16 // compute virtual address of L3 PTE
514 mov r29=b0 // save b0 in case of nested fault
515 mov r31=pr // save pr
517 mov r28=ar.ccv // save ar.ccv
520 ;; // avoid RAW on r18
521 mov ar.ccv=r18 // set compare value for cmpxchg
522 or r25=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
524 cmpxchg8.acq r26=[r17],r25,ar.ccv
525 mov r24=PAGE_SHIFT<<2
529 (p6) itc.d r25 // install updated PTE
532 * Tell the assemblers dependency-violation checker that the above "itc" instructions
533 * cannot possibly affect the following loads:
537 ld8 r18=[r17] // read PTE again
539 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
542 mov b0=r29 // restore b0
547 ;; // avoid RAW on r18
548 or r18=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
549 mov b0=r29 // restore b0
551 st8 [r17]=r18 // store back updated PTE
552 itc.d r18 // install updated PTE
554 mov pr=r31,-1 // restore pr
559 /////////////////////////////////////////////////////////////////////////////////////////
560 // 0x2400 Entry 9 (size 64 bundles) Instruction Access-bit (27)
563 // Like Entry 8, except for instruction access
564 mov r16=cr.ifa // get the address that caused the fault
565 movl r30=1f // load continuation point in case of nested fault
566 mov r31=pr // save predicates
567 #ifdef CONFIG_ITANIUM
569 * Erratum 10 (IFA may contain incorrect address) has "NoFix" status.
574 tbit.z p6,p0=r17,IA64_PSR_IS_BIT // IA64 instruction set?
576 (p6) mov r16=r18 // if so, use cr.iip instead of cr.ifa
577 #endif /* CONFIG_ITANIUM */
579 thash r17=r16 // compute virtual address of L3 PTE
580 mov r29=b0 // save b0 in case of nested fault)
582 mov r28=ar.ccv // save ar.ccv
586 mov ar.ccv=r18 // set compare value for cmpxchg
587 or r25=_PAGE_A,r18 // set the accessed bit
589 cmpxchg8.acq r26=[r17],r25,ar.ccv
590 mov r24=PAGE_SHIFT<<2
594 (p6) itc.i r25 // install updated PTE
597 * Tell the assemblers dependency-violation checker that the above "itc" instructions
598 * cannot possibly affect the following loads:
602 ld8 r18=[r17] // read PTE again
604 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
607 mov b0=r29 // restore b0
609 #else /* !CONFIG_SMP */
613 or r18=_PAGE_A,r18 // set the accessed bit
614 mov b0=r29 // restore b0
616 st8 [r17]=r18 // store back updated PTE
617 itc.i r18 // install updated PTE
618 #endif /* !CONFIG_SMP */
624 /////////////////////////////////////////////////////////////////////////////////////////
625 // 0x2800 Entry 10 (size 64 bundles) Data Access-bit (15,55)
628 // Like Entry 8, except for data access
629 mov r16=cr.ifa // get the address that caused the fault
630 movl r30=1f // load continuation point in case of nested fault
632 thash r17=r16 // compute virtual address of L3 PTE
634 mov r29=b0 // save b0 in case of nested fault)
636 mov r28=ar.ccv // save ar.ccv
639 ;; // avoid RAW on r18
640 mov ar.ccv=r18 // set compare value for cmpxchg
641 or r25=_PAGE_A,r18 // set the dirty bit
643 cmpxchg8.acq r26=[r17],r25,ar.ccv
644 mov r24=PAGE_SHIFT<<2
648 (p6) itc.d r25 // install updated PTE
650 * Tell the assemblers dependency-violation checker that the above "itc" instructions
651 * cannot possibly affect the following loads:
655 ld8 r18=[r17] // read PTE again
657 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
664 ;; // avoid RAW on r18
665 or r18=_PAGE_A,r18 // set the accessed bit
667 st8 [r17]=r18 // store back updated PTE
668 itc.d r18 // install updated PTE
670 mov b0=r29 // restore b0
676 /////////////////////////////////////////////////////////////////////////////////////////
677 // 0x2c00 Entry 11 (size 64 bundles) Break instruction (33)
680 * The streamlined system call entry/exit paths only save/restore the initial part
681 * of pt_regs. This implies that the callers of system-calls must adhere to the
682 * normal procedure calling conventions.
684 * Registers to be saved & restored:
685 * CR registers: cr.ipsr, cr.iip, cr.ifs
686 * AR registers: ar.unat, ar.pfs, ar.rsc, ar.rnat, ar.bspstore, ar.fpsr
687 * others: pr, b0, b6, loadrs, r1, r11, r12, r13, r15
688 * Registers to be restored only:
689 * r8-r11: output value from the system call.
691 * During system call exit, scratch registers (including r15) are modified/cleared
692 * to prevent leaking bits from kernel to user level.
695 mov r16=IA64_KR(CURRENT) // r16 = current task; 12 cycle read lat.
697 mov r18=__IA64_BREAK_SYSCALL
705 mov r31=pr // prepare to save predicates
708 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
709 cmp.eq p0,p7=r18,r17 // is this a system call? (p7 <- false, if so)
710 (p7) br.cond.spnt non_syscall
712 ld1 r17=[r16] // load current->thread.on_ustack flag
713 st1 [r16]=r0 // clear current->thread.on_ustack flag
714 add r1=-IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 // set r1 for MINSTATE_START_SAVE_MIN_VIRT
718 /* adjust return address so we skip over the break instruction: */
720 extr.u r8=r29,41,2 // extract ei field from cr.ipsr
722 cmp.eq p6,p7=2,r8 // isr.ei==2?
723 mov r2=r1 // setup r2 for ia64_syscall_setup
725 (p6) mov r8=0 // clear ei to 0
726 (p6) adds r28=16,r28 // switch cr.iip to next bundle cr.ipsr.ei wrapped
727 (p7) adds r8=1,r8 // increment ei to next slot
729 cmp.eq pKStk,pUStk=r0,r17 // are we in kernel mode already?
730 dep r29=r8,r29,41,2 // insert new ei into cr.ipsr
733 // switch from user to kernel RBS:
734 MINSTATE_START_SAVE_MIN_VIRT
735 br.call.sptk.many b7=ia64_syscall_setup
737 MINSTATE_END_SAVE_MIN_VIRT // switch to bank 1
738 ssm psr.ic | PSR_DEFAULT_BITS
740 srlz.i // guarantee that interruption collection is on
741 mov r3=NR_syscalls - 1
743 (p15) ssm psr.i // restore psr.i
744 // p10==true means out registers are more than 8 or r15's Nat is true
745 (p10) br.cond.spnt.many ia64_ret_from_syscall
747 movl r16=sys_call_table
749 adds r15=-1024,r15 // r15 contains the syscall number---subtract 1024
750 movl r2=ia64_ret_from_syscall
752 shladd r20=r15,3,r16 // r20 = sys_call_table + 8*(syscall-1024)
753 cmp.leu p6,p7=r15,r3 // (syscall > 0 && syscall < 1024 + NR_syscalls) ?
754 mov rp=r2 // set the real return addr
756 (p6) ld8 r20=[r20] // load address of syscall entry point
757 (p7) movl r20=sys_ni_syscall
759 add r2=TI_FLAGS+IA64_TASK_SIZE,r13
761 ld4 r2=[r2] // r2 = current_thread_info()->flags
763 and r2=_TIF_SYSCALL_TRACEAUDIT,r2 // mask trace or audit
768 (p8) br.call.sptk.many b6=b6 // ignore this return addr
769 br.cond.sptk ia64_trace_syscall
774 /////////////////////////////////////////////////////////////////////////////////////////
775 // 0x3000 Entry 12 (size 64 bundles) External Interrupt (4)
778 mov r31=pr // prepare to save predicates
780 SAVE_MIN_WITH_COVER // uses r31; defines r2 and r3
781 ssm psr.ic | PSR_DEFAULT_BITS
783 adds r3=8,r2 // set up second base pointer for SAVE_REST
784 srlz.i // ensure everybody knows psr.ic is back on
788 alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
789 mov out0=cr.ivr // pass cr.ivr as first arg
790 add out1=16,sp // pass pointer to pt_regs as second arg
792 srlz.d // make sure we see the effect of cr.ivr
793 movl r14=ia64_leave_kernel
796 br.call.sptk.many b6=ia64_handle_irq
800 /////////////////////////////////////////////////////////////////////////////////////////
801 // 0x3400 Entry 13 (size 64 bundles) Reserved
806 /////////////////////////////////////////////////////////////////////////////////////////
807 // 0x3800 Entry 14 (size 64 bundles) Reserved
812 * There is no particular reason for this code to be here, other than that
813 * there happens to be space here that would go unused otherwise. If this
814 * fault ever gets "unreserved", simply moved the following code to a more
817 * ia64_syscall_setup() is a separate subroutine so that it can
818 * allocate stacked registers so it can safely demine any
819 * potential NaT values from the input registers.
822 * - executing on bank 0 or bank 1 register set (doesn't matter)
823 * - r1: stack pointer
824 * - r2: current task pointer
826 * - r11: original contents (saved ar.pfs to be saved)
827 * - r12: original contents (sp to be saved)
828 * - r13: original contents (tp to be saved)
829 * - r15: original contents (syscall # to be saved)
830 * - r18: saved bsp (after switching to kernel stack)
832 * - r20: saved r1 (gp)
833 * - r21: saved ar.fpsr
834 * - r22: kernel's register backing store base (krbs_base)
835 * - r23: saved ar.bspstore
836 * - r24: saved ar.rnat
837 * - r25: saved ar.unat
838 * - r26: saved ar.pfs
839 * - r27: saved ar.rsc
840 * - r28: saved cr.iip
841 * - r29: saved cr.ipsr
843 * - b0: original contents (to be saved)
845 * - executing on bank 1 registers
846 * - psr.ic enabled, interrupts restored
847 * - p10: TRUE if syscall is invoked with more than 8 out
848 * registers or r15's Nat is true
850 * - r3: preserved (same as on entry)
851 * - r8: -EINVAL if p10 is true
852 * - r12: points to kernel stack
853 * - r13: points to current task
854 * - p15: TRUE if interrupts need to be re-enabled
855 * - ar.fpsr: set to kernel settings
857 GLOBAL_ENTRY(ia64_syscall_setup)
859 # error This code assumes that b6 is the first field in pt_regs.
861 st8 [r1]=r19 // save b6
862 add r16=PT(CR_IPSR),r1 // initialize first base pointer
863 add r17=PT(R11),r1 // initialize second base pointer
865 alloc r19=ar.pfs,8,0,0,0 // ensure in0-in7 are writable
866 st8 [r16]=r29,PT(AR_PFS)-PT(CR_IPSR) // save cr.ipsr
869 st8.spill [r17]=r11,PT(CR_IIP)-PT(R11) // save r11
871 (pKStk) mov r18=r0 // make sure r18 isn't NaT
874 st8 [r16]=r26,PT(CR_IFS)-PT(AR_PFS) // save ar.pfs
875 st8 [r17]=r28,PT(AR_UNAT)-PT(CR_IIP) // save cr.iip
876 mov r28=b0 // save b0 (2 cyc)
879 st8 [r17]=r25,PT(AR_RSC)-PT(AR_UNAT) // save ar.unat
880 dep r19=0,r19,38,26 // clear all bits but 0..37 [I0]
884 st8 [r16]=r19,PT(AR_RNAT)-PT(CR_IFS) // store ar.pfs.pfm in cr.ifs
885 extr.u r11=r19,7,7 // I0 // get sol of ar.pfs
886 and r8=0x7f,r19 // A // get sof of ar.pfs
888 st8 [r17]=r27,PT(AR_BSPSTORE)-PT(AR_RSC)// save ar.rsc
889 tbit.nz p15,p0=r29,IA64_PSR_I_BIT // I0
893 (pUStk) sub r18=r18,r22 // r18=RSE.ndirty*8
897 (pKStk) adds r16=PT(PR)-PT(AR_RNAT),r16 // skip over ar_rnat field
898 (pKStk) adds r17=PT(B0)-PT(AR_BSPSTORE),r17 // skip over ar_bspstore field
902 tnat.nz p12,p0=in4 // [I0]
905 (pUStk) st8 [r16]=r24,PT(PR)-PT(AR_RNAT) // save ar.rnat
906 (pUStk) st8 [r17]=r23,PT(B0)-PT(AR_BSPSTORE) // save ar.bspstore
907 shl r18=r18,16 // compute ar.rsc to be used for "loadrs"
909 st8 [r16]=r31,PT(LOADRS)-PT(PR) // save predicates
910 st8 [r17]=r28,PT(R1)-PT(B0) // save b0
911 tnat.nz p13,p0=in5 // [I0]
913 st8 [r16]=r18,PT(R12)-PT(LOADRS) // save ar.rsc value for "loadrs"
914 st8.spill [r17]=r20,PT(R13)-PT(R1) // save original r1
918 .mem.offset 0,0; st8.spill [r16]=r12,PT(AR_FPSR)-PT(R12) // save r12
919 .mem.offset 8,0; st8.spill [r17]=r13,PT(R15)-PT(R13) // save r13
922 st8 [r16]=r21,PT(R8)-PT(AR_FPSR) // save ar.fpsr
924 cmp.lt p10,p9=r11,r8 // frame size can't be more than local+8
926 stf8 [r16]=f1 // ensure pt_regs.r8 != 0 (see handle_syscall_error)
927 (p9) tnat.nz p10,p0=r15
928 adds r12=-16,r1 // switch to kernel memory stack (with 16 bytes of scratch)
930 st8.spill [r17]=r15 // save r15
934 mov r13=r2 // establish `current'
935 movl r1=__gp // establish kernel global pointer
941 cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
942 movl r17=FPSR_DEFAULT
944 mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
947 END(ia64_syscall_setup)
950 /////////////////////////////////////////////////////////////////////////////////////////
951 // 0x3c00 Entry 15 (size 64 bundles) Reserved
956 * Squatting in this space ...
958 * This special case dispatcher for illegal operation faults allows preserved
959 * registers to be modified through a callback function (asm only) that is handed
960 * back from the fault handler in r8. Up to three arguments can be passed to the
961 * callback function by returning an aggregate with the callback as its first
962 * element, followed by the arguments.
964 ENTRY(dispatch_illegal_op_fault)
968 ssm psr.ic | PSR_DEFAULT_BITS
970 srlz.i // guarantee that interruption collection is on
972 (p15) ssm psr.i // restore psr.i
973 adds r3=8,r2 // set up second base pointer for SAVE_REST
975 alloc r14=ar.pfs,0,0,1,0 // must be first in insn group
979 PT_REGS_UNWIND_INFO(0)
981 br.call.sptk.many rp=ia64_illegal_op_fault
983 alloc r14=ar.pfs,0,0,3,0 // must be first in insn group
987 movl r15=ia64_leave_kernel
993 (p6) br.call.dpnt.many b6=b6 // call returns to ia64_leave_kernel
994 br.sptk.many ia64_leave_kernel
995 END(dispatch_illegal_op_fault)
998 /////////////////////////////////////////////////////////////////////////////////////////
999 // 0x4000 Entry 16 (size 64 bundles) Reserved
1003 .org ia64_ivt+0x4400
1004 /////////////////////////////////////////////////////////////////////////////////////////
1005 // 0x4400 Entry 17 (size 64 bundles) Reserved
1012 // There is no particular reason for this code to be here, other than that
1013 // there happens to be space here that would go unused otherwise. If this
1014 // fault ever gets "unreserved", simply moved the following code to a more
1017 alloc r14=ar.pfs,0,0,2,0
1020 adds r3=8,r2 // set up second base pointer for SAVE_REST
1022 ssm psr.ic | PSR_DEFAULT_BITS
1024 srlz.i // guarantee that interruption collection is on
1026 (p15) ssm psr.i // restore psr.i
1027 movl r15=ia64_leave_kernel
1032 br.call.sptk.many b6=ia64_bad_break // avoid WAW on CFM and ignore return addr
1035 .org ia64_ivt+0x4800
1036 /////////////////////////////////////////////////////////////////////////////////////////
1037 // 0x4800 Entry 18 (size 64 bundles) Reserved
1042 * There is no particular reason for this code to be here, other than that
1043 * there happens to be space here that would go unused otherwise. If this
1044 * fault ever gets "unreserved", simply moved the following code to a more
1048 ENTRY(dispatch_unaligned_handler)
1051 alloc r14=ar.pfs,0,0,2,0 // now it's safe (must be first in insn group!)
1055 ssm psr.ic | PSR_DEFAULT_BITS
1057 srlz.i // guarantee that interruption collection is on
1059 (p15) ssm psr.i // restore psr.i
1060 adds r3=8,r2 // set up second base pointer
1063 movl r14=ia64_leave_kernel
1066 br.sptk.many ia64_prepare_handle_unaligned
1067 END(dispatch_unaligned_handler)
1069 .org ia64_ivt+0x4c00
1070 /////////////////////////////////////////////////////////////////////////////////////////
1071 // 0x4c00 Entry 19 (size 64 bundles) Reserved
1076 * There is no particular reason for this code to be here, other than that
1077 * there happens to be space here that would go unused otherwise. If this
1078 * fault ever gets "unreserved", simply moved the following code to a more
1082 ENTRY(dispatch_to_fault_handler)
1086 * r19: fault vector number (e.g., 24 for General Exception)
1087 * r31: contains saved predicates (pr)
1089 SAVE_MIN_WITH_COVER_R19
1090 alloc r14=ar.pfs,0,0,5,0
1097 ssm psr.ic | PSR_DEFAULT_BITS
1099 srlz.i // guarantee that interruption collection is on
1101 (p15) ssm psr.i // restore psr.i
1102 adds r3=8,r2 // set up second base pointer for SAVE_REST
1105 movl r14=ia64_leave_kernel
1108 br.call.sptk.many b6=ia64_fault
1109 END(dispatch_to_fault_handler)
1112 // --- End of long entries, Beginning of short entries
1115 .org ia64_ivt+0x5000
1116 /////////////////////////////////////////////////////////////////////////////////////////
1117 // 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
1118 ENTRY(page_not_present)
1123 * The Linux page fault handler doesn't expect non-present pages to be in
1124 * the TLB. Flush the existing entry now, so we meet that expectation.
1126 mov r17=PAGE_SHIFT<<2
1132 br.sptk.many page_fault
1133 END(page_not_present)
1135 .org ia64_ivt+0x5100
1136 /////////////////////////////////////////////////////////////////////////////////////////
1137 // 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
1138 ENTRY(key_permission)
1145 br.sptk.many page_fault
1148 .org ia64_ivt+0x5200
1149 /////////////////////////////////////////////////////////////////////////////////////////
1150 // 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
1151 ENTRY(iaccess_rights)
1158 br.sptk.many page_fault
1161 .org ia64_ivt+0x5300
1162 /////////////////////////////////////////////////////////////////////////////////////////
1163 // 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
1164 ENTRY(daccess_rights)
1171 br.sptk.many page_fault
1174 .org ia64_ivt+0x5400
1175 /////////////////////////////////////////////////////////////////////////////////////////
1176 // 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
1177 ENTRY(general_exception)
1183 (p6) br.sptk.many dispatch_illegal_op_fault
1185 mov r19=24 // fault number
1186 br.sptk.many dispatch_to_fault_handler
1187 END(general_exception)
1189 .org ia64_ivt+0x5500
1190 /////////////////////////////////////////////////////////////////////////////////////////
1191 // 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35)
1192 ENTRY(disabled_fp_reg)
1194 rsm psr.dfh // ensure we can access fph
1199 br.sptk.many dispatch_to_fault_handler
1200 END(disabled_fp_reg)
1202 .org ia64_ivt+0x5600
1203 /////////////////////////////////////////////////////////////////////////////////////////
1204 // 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50)
1205 ENTRY(nat_consumption)
1208 END(nat_consumption)
1210 .org ia64_ivt+0x5700
1211 /////////////////////////////////////////////////////////////////////////////////////////
1212 // 0x5700 Entry 27 (size 16 bundles) Speculation (40)
1213 ENTRY(speculation_vector)
1216 * A [f]chk.[as] instruction needs to take the branch to the recovery code but
1217 * this part of the architecture is not implemented in hardware on some CPUs, such
1218 * as Itanium. Thus, in general we need to emulate the behavior. IIM contains
1219 * the relative target (not yet sign extended). So after sign extending it we
1220 * simply add it to IIP. We also need to reset the EI field of the IPSR to zero,
1221 * i.e., the slot to restart into.
1223 * cr.imm contains zero_ext(imm21)
1228 shl r18=r18,43 // put sign bit in position (43=64-21)
1232 shr r18=r18,39 // sign extend (39=43-4)
1235 add r17=r17,r18 // now add the offset
1238 dep r16=0,r16,41,2 // clear EI
1245 END(speculation_vector)
1247 .org ia64_ivt+0x5800
1248 /////////////////////////////////////////////////////////////////////////////////////////
1249 // 0x5800 Entry 28 (size 16 bundles) Reserved
1253 .org ia64_ivt+0x5900
1254 /////////////////////////////////////////////////////////////////////////////////////////
1255 // 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
1261 .org ia64_ivt+0x5a00
1262 /////////////////////////////////////////////////////////////////////////////////////////
1263 // 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57)
1264 ENTRY(unaligned_access)
1267 mov r31=pr // prepare to save predicates
1269 br.sptk.many dispatch_unaligned_handler
1270 END(unaligned_access)
1272 .org ia64_ivt+0x5b00
1273 /////////////////////////////////////////////////////////////////////////////////////////
1274 // 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57)
1275 ENTRY(unsupported_data_reference)
1278 END(unsupported_data_reference)
1280 .org ia64_ivt+0x5c00
1281 /////////////////////////////////////////////////////////////////////////////////////////
1282 // 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64)
1283 ENTRY(floating_point_fault)
1286 END(floating_point_fault)
1288 .org ia64_ivt+0x5d00
1289 /////////////////////////////////////////////////////////////////////////////////////////
1290 // 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66)
1291 ENTRY(floating_point_trap)
1294 END(floating_point_trap)
1296 .org ia64_ivt+0x5e00
1297 /////////////////////////////////////////////////////////////////////////////////////////
1298 // 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Transfer Trap (66)
1299 ENTRY(lower_privilege_trap)
1302 END(lower_privilege_trap)
1304 .org ia64_ivt+0x5f00
1305 /////////////////////////////////////////////////////////////////////////////////////////
1306 // 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68)
1307 ENTRY(taken_branch_trap)
1310 END(taken_branch_trap)
1312 .org ia64_ivt+0x6000
1313 /////////////////////////////////////////////////////////////////////////////////////////
1314 // 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69)
1315 ENTRY(single_step_trap)
1318 END(single_step_trap)
1320 .org ia64_ivt+0x6100
1321 /////////////////////////////////////////////////////////////////////////////////////////
1322 // 0x6100 Entry 37 (size 16 bundles) Reserved
1326 .org ia64_ivt+0x6200
1327 /////////////////////////////////////////////////////////////////////////////////////////
1328 // 0x6200 Entry 38 (size 16 bundles) Reserved
1332 .org ia64_ivt+0x6300
1333 /////////////////////////////////////////////////////////////////////////////////////////
1334 // 0x6300 Entry 39 (size 16 bundles) Reserved
1338 .org ia64_ivt+0x6400
1339 /////////////////////////////////////////////////////////////////////////////////////////
1340 // 0x6400 Entry 40 (size 16 bundles) Reserved
1344 .org ia64_ivt+0x6500
1345 /////////////////////////////////////////////////////////////////////////////////////////
1346 // 0x6500 Entry 41 (size 16 bundles) Reserved
1350 .org ia64_ivt+0x6600
1351 /////////////////////////////////////////////////////////////////////////////////////////
1352 // 0x6600 Entry 42 (size 16 bundles) Reserved
1356 .org ia64_ivt+0x6700
1357 /////////////////////////////////////////////////////////////////////////////////////////
1358 // 0x6700 Entry 43 (size 16 bundles) Reserved
1362 .org ia64_ivt+0x6800
1363 /////////////////////////////////////////////////////////////////////////////////////////
1364 // 0x6800 Entry 44 (size 16 bundles) Reserved
1368 .org ia64_ivt+0x6900
1369 /////////////////////////////////////////////////////////////////////////////////////////
1370 // 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)
1371 ENTRY(ia32_exception)
1376 .org ia64_ivt+0x6a00
1377 /////////////////////////////////////////////////////////////////////////////////////////
1378 // 0x6a00 Entry 46 (size 16 bundles) IA-32 Intercept (30,31,59,70,71)
1379 ENTRY(ia32_intercept)
1381 #ifdef CONFIG_IA32_SUPPORT
1385 extr.u r17=r16,16,8 // get ISR.code
1387 mov r19=cr.iim // old eflag value
1390 (p6) br.cond.spnt 1f // not a system flag fault
1393 extr.u r17=r16,18,1 // get the eflags.ac bit
1396 (p6) br.cond.spnt 1f // eflags.ac bit didn't change
1398 mov pr=r31,-1 // restore predicate registers
1402 #endif // CONFIG_IA32_SUPPORT
1406 .org ia64_ivt+0x6b00
1407 /////////////////////////////////////////////////////////////////////////////////////////
1408 // 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt (74)
1409 ENTRY(ia32_interrupt)
1411 #ifdef CONFIG_IA32_SUPPORT
1413 br.sptk.many dispatch_to_ia32_handler
1419 .org ia64_ivt+0x6c00
1420 /////////////////////////////////////////////////////////////////////////////////////////
1421 // 0x6c00 Entry 48 (size 16 bundles) Reserved
1425 .org ia64_ivt+0x6d00
1426 /////////////////////////////////////////////////////////////////////////////////////////
1427 // 0x6d00 Entry 49 (size 16 bundles) Reserved
1431 .org ia64_ivt+0x6e00
1432 /////////////////////////////////////////////////////////////////////////////////////////
1433 // 0x6e00 Entry 50 (size 16 bundles) Reserved
1437 .org ia64_ivt+0x6f00
1438 /////////////////////////////////////////////////////////////////////////////////////////
1439 // 0x6f00 Entry 51 (size 16 bundles) Reserved
1443 .org ia64_ivt+0x7000
1444 /////////////////////////////////////////////////////////////////////////////////////////
1445 // 0x7000 Entry 52 (size 16 bundles) Reserved
1449 .org ia64_ivt+0x7100
1450 /////////////////////////////////////////////////////////////////////////////////////////
1451 // 0x7100 Entry 53 (size 16 bundles) Reserved
1455 .org ia64_ivt+0x7200
1456 /////////////////////////////////////////////////////////////////////////////////////////
1457 // 0x7200 Entry 54 (size 16 bundles) Reserved
1461 .org ia64_ivt+0x7300
1462 /////////////////////////////////////////////////////////////////////////////////////////
1463 // 0x7300 Entry 55 (size 16 bundles) Reserved
1467 .org ia64_ivt+0x7400
1468 /////////////////////////////////////////////////////////////////////////////////////////
1469 // 0x7400 Entry 56 (size 16 bundles) Reserved
1473 .org ia64_ivt+0x7500
1474 /////////////////////////////////////////////////////////////////////////////////////////
1475 // 0x7500 Entry 57 (size 16 bundles) Reserved
1479 .org ia64_ivt+0x7600
1480 /////////////////////////////////////////////////////////////////////////////////////////
1481 // 0x7600 Entry 58 (size 16 bundles) Reserved
1485 .org ia64_ivt+0x7700
1486 /////////////////////////////////////////////////////////////////////////////////////////
1487 // 0x7700 Entry 59 (size 16 bundles) Reserved
1491 .org ia64_ivt+0x7800
1492 /////////////////////////////////////////////////////////////////////////////////////////
1493 // 0x7800 Entry 60 (size 16 bundles) Reserved
1497 .org ia64_ivt+0x7900
1498 /////////////////////////////////////////////////////////////////////////////////////////
1499 // 0x7900 Entry 61 (size 16 bundles) Reserved
1503 .org ia64_ivt+0x7a00
1504 /////////////////////////////////////////////////////////////////////////////////////////
1505 // 0x7a00 Entry 62 (size 16 bundles) Reserved
1509 .org ia64_ivt+0x7b00
1510 /////////////////////////////////////////////////////////////////////////////////////////
1511 // 0x7b00 Entry 63 (size 16 bundles) Reserved
1515 .org ia64_ivt+0x7c00
1516 /////////////////////////////////////////////////////////////////////////////////////////
1517 // 0x7c00 Entry 64 (size 16 bundles) Reserved
1521 .org ia64_ivt+0x7d00
1522 /////////////////////////////////////////////////////////////////////////////////////////
1523 // 0x7d00 Entry 65 (size 16 bundles) Reserved
1527 .org ia64_ivt+0x7e00
1528 /////////////////////////////////////////////////////////////////////////////////////////
1529 // 0x7e00 Entry 66 (size 16 bundles) Reserved
1533 .org ia64_ivt+0x7f00
1534 /////////////////////////////////////////////////////////////////////////////////////////
1535 // 0x7f00 Entry 67 (size 16 bundles) Reserved
1539 #ifdef CONFIG_IA32_SUPPORT
1542 * There is no particular reason for this code to be here, other than that
1543 * there happens to be space here that would go unused otherwise. If this
1544 * fault ever gets "unreserved", simply moved the following code to a more
1548 // IA32 interrupt entry point
1550 ENTRY(dispatch_to_ia32_handler)
1554 ssm psr.ic | PSR_DEFAULT_BITS
1556 srlz.i // guarantee that interruption collection is on
1559 adds r3=8,r2 // Base pointer for SAVE_REST
1564 shr r14=r14,16 // Get interrupt number
1566 cmp.ne p6,p0=r14,r15
1567 (p6) br.call.dpnt.many b6=non_ia32_syscall
1569 adds r14=IA64_PT_REGS_R8_OFFSET + 16,sp // 16 byte hole per SW conventions
1570 adds r15=IA64_PT_REGS_R1_OFFSET + 16,sp
1572 cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
1573 ld8 r8=[r14] // get r8
1575 st8 [r15]=r8 // save original EAX in r1 (IA32 procs don't use the GP)
1577 alloc r15=ar.pfs,0,0,6,0 // must first in an insn group
1579 ld4 r8=[r14],8 // r8 == eax (syscall number)
1580 mov r15=IA32_NR_syscalls
1582 cmp.ltu.unc p6,p7=r8,r15
1583 ld4 out1=[r14],8 // r9 == ecx
1585 ld4 out2=[r14],8 // r10 == edx
1587 ld4 out0=[r14] // r11 == ebx
1588 adds r14=(IA64_PT_REGS_R13_OFFSET) + 16,sp
1590 ld4 out5=[r14],PT(R14)-PT(R13) // r13 == ebp
1592 ld4 out3=[r14],PT(R15)-PT(R14) // r14 == esi
1593 adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
1595 ld4 out4=[r14] // r15 == edi
1596 movl r16=ia32_syscall_table
1598 (p6) shladd r16=r8,3,r16 // force ni_syscall if not valid syscall number
1599 ld4 r2=[r2] // r2 = current_thread_info()->flags
1602 and r2=_TIF_SYSCALL_TRACEAUDIT,r2 // mask trace or audit
1605 movl r15=ia32_ret_from_syscall
1609 (p8) br.call.sptk.many b6=b6
1610 br.cond.sptk ia32_trace_syscall
1613 alloc r15=ar.pfs,0,0,2,0
1614 mov out0=r14 // interrupt #
1615 add out1=16,sp // pointer to pt_regs
1616 ;; // avoid WAW on CFM
1617 br.call.sptk.many rp=ia32_bad_interrupt
1618 .ret1: movl r15=ia64_leave_kernel
1622 END(dispatch_to_ia32_handler)
1624 #endif /* CONFIG_IA32_SUPPORT */